Load-susceptible system, machine incorporating it and method of controlling hydraulic drive

FIELD: machine building.

SUBSTANCE: proposed system comprises first assembly of actuators to control first hydraulic function, pump to feed hydraulic fluid at pressure into said actuators, electrically control valve to control pump discharge pressure by hydraulic signal, first pressure transducer to measure load pressure of the said first assembly of actuators, and control unit to receive signal containing data on load pressure measured by first pressure transducer and to generate control signal corresponding to first measured load pressure to be transmitted to said control valve. Note here that control unit allow determining required pump pressure so that difference between measured load pressure and pump pressure varies depending upon operating conditions.

EFFECT: higher efficiency of control.

18 cl, 3 dwg

 

The technical field to which the invention relates.

The present invention relates to a sensitive load management system, containing the first node actuators for controlling the first hydraulic function (work function of the hydraulic actuator), the pump is designed to supply hydraulic fluid under pressure in such actuators, and valve with electric control designed to control the output pressure of the pump by a hydraulic signal. The invention relates also to a machine containing such a system. The working machine in the form of a wheel loader has several job functions with a hydraulic actuator, such as lifting and tilting of the hinged tools and steering the machine. Typically, actuators include linear motors in the form of hydraulic cylinders. The invention also relates to a method to control the hydraulic function (hydraulic actuator).

The invention will be described hereinafter as an example of a wheel loader. This is the preferred use, however, it in no way limits the scope of the invention. The invention may also be applied to other types of work machines (or self-propelled material handling machines, such as backhoe loader, excavator or is agricultural purpos the agricultural machine, such as a tractor.

Accordingly, such a hydraulic system is sensitive to the load system (controlled hydraulic drive). This means that when the pump is measured by the pressure measurement signal load) involved in hydraulic cylinders. After that the pump sets the pressure that a certain number of bar higher than the pressure in the cylinders. This leads to the inflow of oil to the control cylinders, the degree of which depends on the opening degree of the involved control valve. Usually the so-called control pressure is constant. The control pressure is the difference between the pump pressure and the pressure of the load. Typically, the pump is used so that it has established a constant pressure of 20-30 bar above the measured pressure load. Thus selects the level of the control pressure, which corresponds to the current operating state. There are systems in which the control pressure may vary.

Disclosure of inventions

The aim of the invention is to provide sensitive to system load (by measurement), which creates conditions for a more efficient operation in terms of power consumption and reliable performance. The invention particularly aims to create a more optimal the Noah system, in which a control pressure can be adjusted depending on the position of the various working bodies or from the operating mode.

This goal is achieved by using the system according to claim 1 of the claims. Accordingly, the objective is achieved through sensitive to the load of the system, containing:

the first node actuators to control the first work function;

- pump for submission to the actuators of hydraulic fluid under pressure;

- valve with electric control for controlling the output pressure of the pump using the hydraulic signal;

characterized in that it contains:

the first pressure sensor for measuring the pressure load of the first node actuators; and

a control unit for receiving a signal containing information about the pressure of the load measured by the first pressure sensor, and for generating a control signal corresponding to the measured pressure load, which is transmitted to the valve with electric control.

The first hydraulic (working) function is preferably a function of the lift, however, may be another function, such as function of the inclination or steering wheel.

The use of an adjustable pressure control allows you to set the pressure we are the sa at a low base level and set pressure, which exceeds its only 5-10 bar, that is, the pressure increases as little as possible (the limit is determined by the requirements for lubrication and cooling). If you need a higher control pressure, for example 30 bar, the valve electric control valve with the measurement of the load)for controlling the operation of the pump, must compensate for this increase. In accordance with one variant of the level of pressure to the actuator (cylinder) is 100 bar. In this case, the valve with the measurement of the load sets the pressure level equal to 125 bar, and the pump further increase the pressure to 5 bar, i.e., the pump pressure will be 130 bar. As a result, the low pressure idling can be reduced loss resistance (no load losses). When the pump is not required to create a working pressure, it idling (for example, 5 bar instead of 30 bar).

In addition, created preconditions for reducing losses on management due with less output streams to perform job functions. The lower the amount of flow required to perform the function, the less the pressure control may be used as the governing body of the control valve to perform the function opens to a greater extent. If the operator specifies 50% pain the second thread to perform the function the regulatory body of the valve can be opened fully, and the control pressure can be reduced, for example, 30 bar up to 8 bar with valve with electric control. In practice, this means that the greater the deviation of the control arm, the greater the pressure control will be used.

In addition, the conditions for intensive perform the function of shaking. In some situations, you must be able to perform the shaking of the working tools, such as a bucket, for a full shaking its contents. In such situations, the mode of shaking can be enabled by the button or moving the lever forward and backward in some models. If the computer detects that the operator wants to perform the shaking, the valve with electric control must set the pump to a higher pressure level to increase the flow at higher pressure control.

In accordance with one of the preferred options valve with electric control for controlling the operation of the pump, is designed in such a way that it is placed in a position in which the hydraulic signal sent to the pump sets, essentially, a constant pressure pump, disappears when the input signal coming into the valve from the control unit. Preferably constant pressure pump is m cemalinin pressure. This means that the hydraulic system will then operate as a system of constant pressure. Accordingly, the pump provides the necessary flow, but will create the maximum pressure. Thus, the operator will be able to continue working in case of failure of the electronics.

In accordance with another preferred system includes a function steering wheel. As a rule, to perform the function of the steering control valve is used the site in the form of a rotary device. As is known, when using such a rotary device, there are problems associated with the resonant amplification of pressure fluctuations. This occurs because the hydraulic signal measurement load discharged from a rotary device also contains fluctuations, But instead of reading the measuring signal of the load coming from the pressure sensors rotary device, and setting a higher pressure via valve with electric control can be obtained a stable signal of the load measurement, i.e. the filtered signal for transmission at the pump.

In accordance with another preferred variant, the system comprises a position sensor of the actuator. In this case, will create opportunities for damping stroke of mechanismas extreme positions. If the system uses a single pump to provide some functions, such as steering, the electric signal of the load measurement can be used for damping stroke of the mechanism in the extreme positions. This means that the control unit using the position sensor determines when the actuator (cylinder) is approaching an extreme position. In this case, the valve with electric control can reduce the control pressure to the appropriate level, so that the maximum speed of rotation is reduced, which means that the operator will not be able to exceed a certain speed of rotation.

The position sensors also allow for power control. In some situations, you want to minimize the maximum possible output hydraulic power, because the engine cannot develop more power at low speed. The power expended to perform functions that are controlled using electrical signals, can be easily limited, however there is a problem with multi-turn steering device, for which an electrical signal is not used. When using a control electric signal maximum flow can be reduced by reducing davleniyeni. Hydraulic power can be calculated if you know the pressure level of the pump (pumps) and its (their) stream, and the efficiency of the system. For a rotary device, the flow can be calculated using the computer that reads the position of the cylinder, steering, measured by the position sensors. If the stream is too large for a given operating position (depends, inter alia, on the pressure level and other factors), the control pressure may be reduced to provide the corresponding maximum acceptable flow. If to ensure the function of steering and other functions make use of one common pump, the problem is also solved. This can be used valves with electric control, which reduces the pressure to perform other job functions, and since the function steering has a higher priority than other features, the computer can check how much power the operator sets using the steering body control (stream using the position sensor steering cylinder and pressure using pressure sensors). If the level of this power is reduced below the permissible value, the remaining capacity can be used to perform other job functions, and in this case will take place only og anichini. In the case where the level of this power exceeds the allowable value, to perform other work functions not allocated power, which means that the pressure level of the pump will depend on the pressure load measurement function steering control, and thus with suitable pressure load measurement, asked valve with electric control, can be achieved by reducing the maximum flow. A certain degree of steering control should always be available, with the lowest level of measurement of the load is obtained directly from a rotary device, if the electric signal measuring load dropped to zero, that is, after the control pressure becomes equal to the pressure control pump, which is at the level of 5-10 bar. It also provides a higher level of reliability, because the measuring signal of the load function steering never can be completely set to zero via valve with electric control.

In accordance with another preferred option, the system contains multiple nodes Executive mechanisms to control the execution of various job functions, and at least one pressure sensor associated with each such node is to measure the pressure load of the corresponding node.

This allows suppression of pressure fluctuations in the system. The control unit records the pressure at various places in the system. If the control unit detects an abnormal pressure fluctuations, the pressure can be regulated in order to avoid resonance points system. If simultaneous use of several working functions, the regulatory bodies of the control valves can be opened or closed to a greater extent, depending on increases or decreases the pressure control, with the aim of obtaining the same level of flow. If the control pressure is low when resonance occurs, the control pressure can be increased. If the control pressure is already at a high level, you can run it reduced certain valid steps. The temporal variation remains as long as the system will not be a change in pressure and flow.

Another object of the invention is a method to ensure effective management in sensitive to the load of the system in terms of power consumption. In particular, the invention relates to a method in which a control pressure can be adjusted depending on various provisions of the working body or operating modes.

This goal is achieved by using the method declared in the corresponding independent claim. Accordingly, this goal is achieved by using a method which includes measuring the pressure load of the actuator, designed to control the work function, using the pressure sensor, and controlling the pump, intended for supply to the actuator with hydraulic fluid under pressure corresponding to the measured pressure load, in accordance with a hydraulic signal.

In accordance with a preferred variant of the method comprises the actuation of the valve, electrically operated by means of an electrical signal corresponding to the measured pressure load, and the valve controls the output pressure of the pump accordingly using a hydraulic signal. This provides the system with a high degree of reliability, because the valve with electric control may be arranged in such a way that the pump was transferred to a hydraulic signal, even if lost input signal to the valve with electric control.

The inventive method also includes determining the required pump pressure, which is proportional to the measured pressure load (and usually above)and the corresponding control of the pump. Accordingly, the control pressure can be adjusted depending the on operating mode. This is done preferably by measuring the output pressure of the pump and signal management, taking into account that the measured output pressure of the pump.

In accordance with another preferred variant of the method involves determining the position of the management body associated with a work function, and the actuation control valve installed between the pump and actuator, in accordance with the specified provision of the governing body of the operator. The method preferably includes adjusting pump control and actuation of the control valve. This provides the opportunity to reduce the loss of control at low output streams are used to perform functions. The smaller the flow required to perform a certain function, the smaller the pressure control may be used as the regulator of the control valve is opened to a greater extent.

Other preferred embodiments of the invention and their advantages will become apparent from the claims and the following description.

Brief description of drawings

The invention is described below in more detail with reference to variations in its implementation, are presented in the attached drawings on which is shown:

figure 1 is a side view of the wheel has pagrus the ICA;

figure 2-3 - views of two different variants of the system for a wheel loader.

The implementation of the invention

Figure 1 shows a side view of the wheel loader 101. Wheel loader 101 has a front portion 102 and rear portion 103, each of which contains a frame, and two leading axis 112, 113. In the rear part 103 of the truck is the cab 114 of the operator. Part 102, 103 of the truck are connected with the possibility of rotation relative to each other around a vertical axis by means of two hydraulic cylinders 104, 105, which is attached to the parts 102, 103. Accordingly, the hydraulic cylinders 104, 105 are located on both sides of the Central line in the longitudinal direction of the truck to control the direction of its movement or rotation of the loader 101.

Wheel loader 101 is equipped with a mechanism 111 for loading/unloading of objects or material. The mechanism 111 includes a block 106 cargo boom and ancillary tool 107 in the form of a bucket that is mounted on a block of a cargo boom. As shown in figure 1, the bucket 107 is filled with material 116. The first end of the cargo boom 106 is attached to the front portion 102 of the truck can be rotated to ensure the bucket is raised. The bucket 107 is attached to the second end of the block 106 cargo boom can be rotated to change the tilt of the bucket.

Block 106 cargo boom can the be raised and lowered relative to the front portion 102 of the truck by means of two hydraulic cylinders 108, 109, each of which is attached one end to the front portion 102 of the truck and the other end to the block 106 cargo boom. The bucket 107 can be tilted relative to the block 106 cargo boom with the help of the third hydraulic cylinder 110, which is attached one end to the front portion 102 of the truck and the other end to the bucket 107 through a system of connecting links and rods.

Below will be described in more detail versions of the system management functions of the work wheel loader 101.

The first version of the system presented in figure 2. The system 201 includes the first node 203 actuators to control the first work function of the hydraulic system, namely the lifting and lowering unit cargo boom. In this case, the actuators are lifting cylinders 108, 109.

System 201 also includes a pump 205 designed to supply hydraulic fluid under pressure in the actuators in the hydraulic network. The pump 205 is supplied from the engine 206 of the truck, which is a diesel engine. The pump 205 has a variable working volume. Preferably the pump is used 205 with stepless adjustment. The system 201 includes a block 208 valves (indicated by phantom lines)containing hydraulic network with valves control the expression.

Two control valves in the form of flow regulators 207, 209 are located in the hydraulic line between the pump 205 and the hydraulic lifting cylinders 108, 109 to control the lifting and lowering of the mounted guns. The first valve 207 management provides the connection of the pump 205 side of the piston and the second valve 209 management provides the connection of the tank 243 side of the piston rod. In addition, the first valve 207 management provides the connection of the tank 243 side of the piston, and accordingly, the second valve 209 management provides the connection of the pump 205 side of the piston rod. This scheme provides broad management capabilities. In particular, to perform the function it is not necessary to simultaneously connect the pump and the tank.

System 201 also includes a control block 213 (or computer)that contains the software to control operating functions of the truck. The control unit also called a Central processing unit or electronic control module. The control block 213 preferably includes a microprocessor.

Unit 213 controls functionally connected to the body 211 of the control operator in the form of handlebars rise. Block 213 management ensures the reception of the control signals generated by the control handle up and lead the group in their respective valves 207, 209 management (through the block 215 control valves). Unit 213 controls preferably provides a more General management and the block 215 control valves manages the basic functions of block 208 valves. Of course, the blocks 213, 215 management can be combined into one common unit. When you run the pump 205 is provided by the inflow of oil into the cylinders 108, 109, the degree of which depends on the opening degree of the involved valves 207, 209.

System 201 also includes a second node 217 actuators to control the second work function, namely steering the working machine. In this case, the actuators are cylinders 104, 105 steering. The body of 219 the management of the operator in the form of a steering wheel is connected hydraulically with the cylinders 104, 105 through valve site in the form of a rotary device 220 for direct control cylinders.

The system 201 includes a third node 221 actuators to control a third work function, namely the slope of the mounted guns. In this case, the actuator consists of a cylinder 110 tilt. As in the case of the lift function of the mounted guns, between the pump 205 and the cylinder 110 of the slope there are two valve 223, 225 to control the movement backward and forward mounted guns from siteline unit cargo boom. Unit 213 controls functionally connected to the body 227 control operator in the form of arms control tilt. Block 213 management ensures the reception of the control signals generated by the control handle tilt, and actuation of the respective valves 223, 225 control.

On the output tube 245 pump is valve 220 priority for the automatic provision of priority, namely, that the function of controlling the direction of movement of the truck is provided primarily concerning the function of lifting (and tilt).

As already mentioned, the system 201 is measured by the load, which uses sensors 229, 231, 233, 235, 237 pressure to measure the pressure created by the load for each of the above functions. To ensure the function of lifting the hinged tools the system uses two sensors 229, 231 pressure, one of which is on the tube going to the side of the piston of the lifting cylinder, and the other is on the tube going to the side of the piston rods of these cylinders. Similarly, to ensure the tilt of the mounted gun system uses two sensors 235, 237 pressure, one of which is on the tube going to the side of the piston rod of the tilt cylinder, and the other is on the tube going to the side of the piston of this cylinder. To ensure f is NCLI steering loader the system uses a sensor 233 pressure, mounted on the tube going to the cylinders 104, 105 steering. More precisely, the sensor 233 pressure is on-hook load measurement, the pressure of which is equal to the pressure on the side of one cylinder, when the rotation is in one direction, and pressure on the other side of the cylinder, when the rotation is in the opposite direction. In the neutral position the tube measuring the load is connected with the tank.

The system also includes a valve 241 with electric control designed to control the output pressure of the pump using the hydraulic signal. The system 201 includes an additional sensor 239 pressure for pressure measurement, which is a measure of the output pressure of the pump. More precisely, the sensor 239 pressure is designed to measure the pressure at the point of the hydraulic system after the valve 241 with electric control. Accordingly, the sensor 239 pressure directly measures the pressure created by the pump when the valve 241 is fully otkryt normal operating mode, the sensor 239 pressure measures the pressure adjustable valve 241. Accordingly, the control block 213 is designed to receive signal from the sensor 239 pressure pump, containing information about the pressure level.

Thus, the control block 213 is functionally connected to the sensors 229, 231, 233, 235, 237, 239 ´┐ŻAlenia and valve 241 with electric control. Accordingly, the control block 213 receives the electric signals from the sensors 229, 231, 233, 235, 237, 239 pressure and produces an electrical signal to actuate the valve 241 with electric control. In addition, the block 213 management ensures the formation of the control signal corresponding to the measured pressure load to be transferred to the valve 241 with electric control.

As already mentioned, the control block 213 is designed to receive signals from the arms 211, 227 management. If the operator needs to raise the bucket, he uses the handle 211 lifting. The control unit receives from the arm 211 of the rise and sets the valves 207, 209 control in such a position, in which the pump is connected with the side of the pistons of the lifting cylinders 108, 109, and the side rods of the pistons of the lifting cylinder is connected with the reservoir 243. In addition, the control unit receives signals from the sensor 229 load pressure side of the piston of the lifting cylinder and from the sensor 239 pressure on the outlet side of the pump. In accordance with the signals to determine the required pump pressure exceeding the pressure measured load, and uses appropriate way valve 241 with electric control.

Unit 213 controls preferably provides the coordination degree open the Oia valves 207, 209 control and output pressure of the pump 205 to optimize system operation. In accordance with one variant, less than the flow required to perform a certain function, the smaller the pressure control may be used as the regulator of the control valve is opened to a greater extent. If the operator determines 50% of the flow to perform the function, the regulatory body of the valve can be opened fully, and the control pressure can be reduced, for example, 30 bar up to 8 bar with valve with electric control. In practice, this means that the greater the deviation of the control arm, the greater the pressure control will be used. Thus, in accordance with the preferred option unit 213 control receives the signal from the arm lifting control that contains information about the required lifting or lowering of the mounted guns. In addition, the control block 213 receives information about the pressure in the lifting cylinders 108, 109 of the sensor 229 pressure. Then define the required output pressure, and accordingly activated valve 241 with electric control. In addition, the control block 213 receives from the pressure sensor 239 pressure value after valve 241 with electric control and sets the desired level of the output pressure on OSU valve 241.

The tilt function of the mounted guns is the same as lift function. When controlling the direction of movement of the truck sensor 233 pressure in the steering subsystem detects the pressure load of the steering, and produces a signal corresponding to the load. The control block 213 receives the load signal and the signal from the sensor 239 pressure at the outlet of the valve 241 with electric control. In accordance with the signals to determine the required pump pressure exceeding the pressure measured load, and uses appropriate way valve 241 with electric control.

If enabled simultaneously several functions, the measured pressure load are compared, and the pump 205 is fed the control signal corresponding to the highest pressure load.

In accordance with the preferred option unit 213 management provides the definition of the required pump pressure so that the pressure difference between the measured pressure of the load and the output pressure of the pump is varied depending on the operating mode. In accordance with another variation of the control pressure raised to a high level when you want to shake with great force, as if shaking out the contents of the bucket.

Unit 213 controls provide the supports continuous determination of the necessary pressure at the pump outlet and generates the appropriate signals in the process.

Valve 241 with electric control for controlling the operation of the pump is connected with the outlet tube 245 pump 205. More precisely, the valve 241 for controlling the operation of the pump, is installed to control the degree of opening of the tube 247 connecting the output tube 245 pump 205 and the receiver 251, which in turn connects to the pump 205 to control its operation using a hydraulic signal. Valve 241 for controlling the operation of the pump, occupies such a position that the hydraulic signal supplied to the pump 205, provides create, essentially, a constant pressure pump (maximum pressure of the pump)when the input signal to the valve 241 of block 213, the control disappears. More precisely valve 241 with electric control for controlling the operation of the pump, provided with a bias spring and is arranged in such a way that it is in the specified position, providing a constant pressure pump, under the action of the spring. Accordingly, the valve 241 for controlling the operation of the pump, is used so that it is in the open position, so that the control signal supplied to the pump represents the output pressure of the pump, when the input signal to the valve 241 of block 213, the control disappears. We can say that in the hydraulic network is "short circuit". Therefore, we can say that it is apan 241, managing the operation of the pump is inverted. Accordingly, the hydraulic signal pressure measurement rises to the level of maximum pressure in case of failure of electronic circuits. This means that the hydraulic system will then operate as a system of constant pressure. Accordingly, the pump provides the necessary flow, but will create the maximum pressure. Thus, the operator will be able to continue working in case of failure of the electronics.

Accordingly, the valve 241 with electric control is arranged so that it can be infinitely set way adjustable between two extreme positions: a first extreme position corresponds to the minimum pressure pump, and a second extreme position corresponds to the maximum pressure.

Accordingly, the sensor 239 pressure pump is installed after the valve 241 controlling the operation of the pump, i.e. on the tube measuring the load going to the pump 205. This creates the conditions for stable operation of the control system.

The tube 251 between the valve 241 is electrically operated and the pump is a hydraulic device 253 in the form of a reversing valve. The reversing valve 253 provides reception hydraulic signals from the second node 217 actuators (steering control the pressure and valve 241, managing the operation of the pump. The reversing valve is designed to control the pump 205 in accordance with the received signal, corresponding to the highest pressure load. Accordingly, the hydraulic device (reversing valve) 253 selects the highest pressure in the output signal composed of the two input signals of the pressure.

The first node 203 actuators (lifting function) contains the sensor 255 to determine the position of the cylinders. This information can be used to control the damping in the approach to extreme positions, i.e. to ensure the slow movement of the pistons of the cylinders when approaching the extreme position. Also for measuring the position of the cylinder when performing functions tilt and steering using the sensor 257, 259 provisions.

Figure 3 shows a second variant of a system 301 management. Unlike the first option to measure the output pressure of the pump is used the sensor 339 pressure mounted on the outside of the block 306 valves containing hydraulic network with control valves and other devices. More precisely, the sensor 339 pressure mounted on the output tube 245 pump immediately at the outlet of the pump 205. Accordingly, the control unit receives information about the output pressure of the pump from the sensor 339 pressure directly at the pump outlet of vostochnaia measuring the pressure load. This creates conditions for accurate regulation of the output pressure of the pump.

The invention should not be deemed limited to the above variants of its implementation, moreover, within the scope of the invention defined by the attached formula may also be offered other options and their modifications.

In the present description, the term "valve with electric control" is used to indicate the valve on the hydraulic tube, managed directly by using an electrical signal, so that the valve is driven by an electrical input signal. Of course, there are several options, which are covered by the term "valve with electric control, such as the site of several valves in which the valve is installed on the hydraulic tube and the second valve with electric control is designed to actuate the first valve using a hydraulic signal.

The options presented on figure 2 and 3 can be combined, and such a combined system contains both the sensor 239 pressure after valve 241 with electric control and sensor 339 pressure directly downstream of the pump.

1. Sensitive to the load system (201, 301), containing:
the first node (203) actuators (108, 109) for controlling the first is hydraulic function,
pump (205), made with the possibility of filing actuators hydraulic fluid under pressure
valve (241) with electric control, configured to control the output pressure of the pump using the hydraulic signal
the first sensor (229, 231) pressure for measuring the pressure load of the first node (203) actuators, and
the control unit (213), configured to receive a signal containing information about the pressure of the load measured by the first sensor (229, 231) pressure, and forming a control signal corresponding to the measured pressure load, which is transmitted to the valve (241) with electric control, characterized in that the control unit (213) is arranged to determine the required pump pressure so that the pressure difference between the measured pressure of the load pressure of the pump was changed depending on the operating mode.

2. The system according to claim 1, characterized in that the unit (213) is a control with the ability to determine the required pump pressure in proportion to the measured pressure of the load and generating a control signal containing information for the corresponding pump (205).

3. The system according to claim 2, characterized in that the block (213) control provides continuous definition is not the required pump pressure and the formation of the corresponding signals.

4. The system according to claim 1, characterized in that it contains an additional sensor (239, 339) pressure for pressure measurement, which is a measure of the output pressure of the pump (205)and the block (213) control provides a signal containing information about the pressure measured by the sensor (239, 339), and forming a control signal in accordance with this information.

5. The system according to claim 1, characterized in that the valve (241) with electric control for controlling the operation of the pump is made with the possibility of establishing a position in which a hydraulic signal to the pump (205), provides essentially constant pressure pump, disappears when the input signal coming into the valve from the control unit.

6. The system according to claim 5, characterized in that the constant pump pressure is the maximum pressure.

7. The system according to claim 5 or 6, characterized in that the valve (241) with electric control for controlling the operation of the pump, provided with a bias spring and executed with the opportunity of being in that position and providing a constant pressure pump, under the action of this spring.

8. The system according to claim 5, characterized in that the valve (241) with electric control for controlling the operation of the pump is made with the possibility of the classes specified position, so that the control signal that is passed to the OS (205), represented the output pressure of the pump, disappears when the input signal coming into the valve from the control unit.

9. The system according to claim 1, characterized in that at least one of the actuators (108, 109) is a hydraulic cylinder.

10. The system according to claim 1, characterized in that it contains the first body (211) control by the operator, and the block (213) control provides a signal containing information about the position of the first governing body of the operator, and accordingly actuates a valve (241) with electric control.

11. The system according to claim 1, characterized in that it contains at least a first valve (207, 209) control mounted on the tube between the pump (205) and the first node (203) actuators to control the execution of the first function.

12. The system according to claim 1, characterized in that the first node (203) actuators is designed to control the lifting of the implement (107).

13. The system according to claim 1, characterized in that it contains nodes (203, 217, 221) actuators, configured to control various functions, and at least one sensor(229, 231, 233, 235, 237) pressure associated with each of these nodes to measure the pressure load of the corresponding node.

14. The system according to claim 1, characterized in that there is a second node (217) actuators, capable of forming a hydraulic signal, corresponding to its pressure load, and a hydraulic device (253)installed on the tube (251) between the valve (241) with electric control, which controls the operation of the pump, and the pump is made with the possibility of receiving the hydraulic signals from the second node (217) actuators and from the specified valve (241) and pump control in accordance with the received signal corresponding to the greater pressure of the load.

15. The system according to claim 1, characterized in that it contains a sensor (255) provisions for the Executive mechanism.

16. Working machine (101), characterized in that it contains the system (201, 301) according to claim 1.

17. The control method is sensitive to the load of the system, including the steps which provide a measurement of the load pressure of the actuator (108, 109), designed for performing hydraulic functions using a sensor (229, 231) pressure, and pump control (205), which provides feed to the actuator hydraulic fluid under pressure corresponding to the pressure of the load, depending on the hydraulic signal, characterized in that the pump pressure is determined so that the difference between the measured pressure of the load pressure of the pump varies depending on the operating mode the mA.

18. The method according to 17, including the step of actuating the valve (241) with electric control using an electric signal corresponding to the measured pressure load, and the valve (241) provides control of the output pressure of the pump accordingly using a hydraulic signal.



 

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1 dwg

FIELD: transport.

SUBSTANCE: proposed preheater comprises hydraulic pump articulated with heat engine and gas heat carrier circulation circuit. Proposed device incorporates heat-isolated chamber and flexible heat-isolated metal hose communicated with inlet branch pipe of heat-isolated chamber mounted for heating interval via special guides outside of hydraulic tank bottom nearby hydraulic pump suction branch pipe. In operation, heat-isolated chamber discharge branch pipe is communicated by similar metal hose with atmosphere. Proposed method of cleaning consists in intermittent feed of preset amount of finely dispersed NaO2 agent into heat-isolated chamber to oxidise (burn out) deposited solid particle after prestarting heater withdrawn from the machine.

EFFECT: simplified design, higher efficiency at negative ambient temperatures.

3 cl, 2 dwg

FIELD: machine building.

SUBSTANCE: power efficient working equipment consists of turning platform, of gantry, of boom, of stick, of bucket, of hydro-cylinders of boom lift. of hydro-cylinders of stick turn and of hydro-cylinder of bucket turn. In vertical plane of symmetry of the boom between hydro-cylinders of stick turn there is installed a pneumatic hydro-cylinder pivotally secured on the turning platform and the boom, a piston cavity of which is connected at least with two gas tanks charged with compressed air at pressure over 10 MPa. Total volume of gas tanks amounts to at least four working volumes of the pneumatic hydro-cylinder. At least one hydraulic damper of working fluid pressure charged with compressed air over 15 MPa is connected to piston cavities of the boom hydro-cylinders.

EFFECT: improved design of working equipment of hydraulic excavator, reduced fluctuations of pressure in hydro-system of working equipment.

2 dwg

FIELD: mining.

SUBSTANCE: energy-saving operating equipment includes digging arm base, digging arm head, handle, bucket, the main hydraulic cylinders for lifting the digging arm, control hydraulic cylinder of the digging arm length, additional balancing pneumatic cylinder connected to portal and to the digging arm base. Piston cavity of balancing pneumatic hydraulic cylinder is connected to gas bottle charged with pressure of more than 10 MPa and having the volume equal at least to five operating volumes of balancing pneumatic hydraulic cylinder. At that, to piston cavity at least of one main hydraulic cylinder for lifting the digging arm there connected is hydropneumatic accumulator the gas cavity of which is charged with initial pressure of more than 10 MPa and divided at least into two gas chambers separated with a partition in which an adjustable orifice is installed.

EFFECT: higher operating efficiency of machine, lower energy losses and higher efficiency of operating equipment.

2 dwg

FIELD: construction.

SUBSTANCE: device comprises a boom, a bucket, the main hydraulic cylinder of the boom, a balancing pneumatic hydraulic cylinder, a gas balloon. The main hydraulic cylinder of the boom and the balancing pneumatic hydraulic cylinder are located in a single longitudinal vertical plane of the boom symmetry, so that the balancing pneumatic hydraulic cylinder is brought to the boom as close as possible in the lower and upper limit positions of the working equipment. The boom base is arranged in the form of a box, where the balancing pneumatic hydraulic cylinder is installed, a piston cavity of which is connected to a gas balloon charged with pressure of more than 10 MPa. At the same time the volume of the gas balloon makes more than five working volumes of the balancing pneumatic hydraulic cylinder.

EFFECT: energy-saving and simplification of design.

2 dwg

FIELD: construction.

SUBSTANCE: energy-saving working equipment of a single-bucket excavator on a rotary column comprises a top utility tractor, a rotary column, including a base and a head, a boom, a handle, a bucket, main hydraulic cylinders of a boom. The boom is hingedly connected to a head of a rotary column, and the main hydraulic cylinders of the boom are hingedly connected to the base of the rotary column and the boom. A balancing pneumatic hydraulic cylinder is connected to the base of the rotary column and the boom, and a piston cavity of the balancing pneumatic hydraulic cylinder is connected to a gas balloon charged with pressure of more than 10 MPa. At the same time the gas balloon volume makes more than five working volumes of the balancing pneumatic hydraulic cylinder, a hinged joint of which is arranged on the base of the rotary column with displacement relative to the boom hinged joint on the rotary column head, with the possibility to ensure compact arrangement at the upper and lower positions of the working equipment.

EFFECT: increased effectiveness and efficiency factor, improved design of the working equipment.

1 dwg

FIELD: construction.

SUBSTANCE: hydraulic system of independent flows distribution consists of hydraulic distributors, discharge cavities of which are supplied from according discharge hydraulic lines. At least another hydraulic distributor is supplied from several discharge hydraulic lines with its discharge cavity via check valves. And at least one check valve that supplies to discharge cavity of any distributor is arranged with the possibility of its forced closure in case of necessity.

EFFECT: distribution of several independent flows by minimum number of distributors between various hydraulic engines.

3 dwg

FIELD: earth-moving facilities; hydraulic drives of scraper working members.

SUBSTANCE: proposed hydraulic drive contains pressure spool installed in parallel with like spaces of two hydraulic cylinders, pressure main line connected between two check valves, free outlet of check valve being connected with inlet of pressure spool and one hydraulic cylinder. Free inlet is connected with outlet of pressure spool and other hydraulic cylinder, drum main line connects opposite spaces of hydraulic cylinders. Hydraulic drive is furnished with two series-connected pressure spools. Inlet of first pressure spool and outlet of second pressure spool are connected with outlet of first hydraulically controlled reversible spool. Their common line is connected with controllable space of second hydraulic cylinder and is separated by check valve from pressure main line. Inlets of first hydraulically controlled reversible spool are connected to outputs of second hydraulically controlled reversible spool and are connected with controllable spaces of first and second hydraulic cylinders. One inlet of second hydraulically controlled reversible spool is connected with inlet of pressure spool and is connected to pressure line through check valve, and second inlet is separated from pressure line by other check valve. Control spaces of two hydraulically controlled reversible spools are united and are connected to pressure main line through two-position spool.

EFFECT: improved efficiency of control of scraper blade system.

4 dwg

FIELD: handling machinery, particularly soil-shifting, mining, agricultural and loading cyclic machines.

SUBSTANCE: device includes implement, main hydraulic cylinders and balancing hydraulic cylinder, at least one gas cylinder and hydropneumatic accumulator, main and additional hydrodistributors, as well as safety valve. Gas cylinder communicates with gas chamber of hydropneumatic accumulator. Device made in the first embodiment has the second additional hydrodistributor connecting working chambers of the main hydraulic cylinders with each other and with pump. Rod end of balancing hydraulic cylinder communicates with rod ends of the main ones. In the second embodiment additional hydraulic cylinder is arranged in main hydrodistributor case and connected to hydrolines of the main hydraulic cylinders through hydrolines. Additional hydrodistributor is installed so that additional hydrodistributor may connect working chambers of the main hydraulic cylinders with each other and with the pump when additional hydrodistributor is installed in the first position. Additional hydrodistributor being installed in the second position may connect working chambers of main hydraulic cylinders with each other and with drain. Rod end of balancing hydraulic cylinder is connected with rod ends of main hydraulic cylinders.

EFFECT: increased machine productivity due to increased implement hoisting speed.

3 cl, 4 dwg

FIELD: mechanical engineering, particularly hydraulically driven dredgers.

SUBSTANCE: drive comprises power plant with controlled power pumps having servo control taps, gear-box, hydraulic motors and hydraulic equipment. Hydraulic equipment has hydraulic distributor with address travel spool and its servo control taps, power hydraulic lines and servo control loop with hydraulic lines. The controlled power pumps may supply predetermined volume of working liquid at zero pressure in servo control lines thereof. Hydraulic lines for servo control of address travel spool have additional circuit including control unit, servo control lines and logical hydraulic OR valve with two inlet and one outlet taps. Hydraulic lines of servo control circuit included in additional loop are connected with inlet taps of hydraulic OR valve having outlet tap communicated with servo control taps of address travel spool.

EFFECT: provision of no-failure gear actuation in standing still dredger.

2 dwg

FIELD: mechanical engineering, particularly hydraulic systems for mobile machines.

SUBSTANCE: hydraulic system comprises hydraulic reservoir, controllable hydraulic pump with load-sensitive control slide, power hydraulic line protected with safety valve, main hydraulic distributor with three-position slide having one pressure supply means, two discharge lines, two working outlet means and line, which provides connection of each working outlet means with LS line, attached to control slide. The hydraulic system is provided with pressure control valve and with controllable reducing valve installed in LS line. Input and output of reducing valve are connected to hydraulic distributor and control slide correspondingly. Control line of reducing valve is linked to pressure control valve outlet. Inlet and discharge line of the pressure control valve are connected with power hydraulic line and with hydraulic reservoir correspondingly.

EFFECT: increased operational efficiency and reliability.

7 cl, 1 dwg

FIELD: earth-moving, mining, building machines and other wheeled and caterpillar handling periodically acting machines.

SUBSTANCE: device comprises working implement, main and balancing hydraulic cylinders, gas cylinder, main and additional working liquid distribution means. The piston cavity of balancing hydraulic cylinder is connected with gas cylinder. Additional distribution means may connect working cavities of main hydraulic cylinders one with another and with hydraulic pump during implement lifting.

EFFECT: increased working implement lifting speed without pump and system parameter change.

4 dwg

FIELD: mining industry, mechanical engineering, possible use in system for controlling caterpillar drive of mining machine.

SUBSTANCE: hydro-system contains pumps for caterpillar drive and pump, feeding system of working functions of machine, hydro-distributors for controlling caterpillar drive, driving hydro-motors and working mains, two controllable check valves and hydro-distributor for controlling system of machine working functions. Outlet channels of hydro-distributor for controlling system of machine working functions are connected to inlet channels of controllable check valves, which are connected between each other. Outlet channels of these valves are connected to working mains of driving hydro-motors and hydro-distributors for controlling caterpillar drive.

EFFECT: possible movement of mining machine in case of breakdown of driving pumps at the expense of influx of working liquid from pump driving system normally used for working functions of machine.

1 dwg

FIELD: earth moving machinery.

SUBSTANCE: invention relates to hydraulic drives of draw-booster gears of tractor-drawn scrapers. Proposed hydraulic drive contains pump, hydraulic tank, hydraulic cylinder, pressure valve connected in parallel with hydraulic cylinder, and hydraulic distributor. Hydraulic drive contains additionally hydraulic accumulator, time relay, check valve, pressure valve is provided with control line, and hydraulic cylinder has control arm engaging with two-position spool whose input is connected with pump and output, through time relay, with hydraulic accumulator and control line of pressure valve and with input of check valve whose output is connected to input of pressure valve.

EFFECT: provision of automatic continuous increase of adhesion weight of tractor of scraper when digging.

3 dwg

FIELD: earth-moving and transport machines, particularly blade assemblies having changeable width of cut.

SUBSTANCE: blade assembly comprises side sections and central section. The sections are provided with undercutting blades and are directly connected to bucket bottom. The central section is hinged to bucket bottom and is operated by rotation hydraulic cylinders through operation levers. Undercutting blades made as gussets are connected to inner edges of side sections from below. The gussets have supports to cooperate with central section in lower position thereof. Undercutting blades of central section are connected to outer side edges of central section. Undercutting gussets are provided with orifices to arrange fixers installed in lower parts of side sections so that they may cooperate with end switches. Position switches adapted to cooperate with operation levers of central section in central or extreme positions are mounted on bucket side walls. Hydraulic cylinders for central section rotation are linked in pairs to hydraulic cylinders for bucket operation. Lifting and lowering cavities of hydraulic cylinders are correspondingly communicated with raising and deepening cavities of hydraulic cylinders for central section rotation. Hydraulic drive for blade assembly includes hydraulically operated on-off three-way slide. The first outlet of the slide is united with the third one and is linked to raising cavity of hydraulic cylinder for central section rotation. Operational chamber and the first inlet of the slide are connected to outlet of pressure slide having output connected to lowering cavities of hydraulic cylinders for bucket operation. The second and the third inlets of on-off three-way slide are correspondingly connected to lifting cavities of hydraulic cylinders, which operate front bucket gate and lowering cavity of hydraulic cylinders for bucket operation.

EFFECT: decreased load to be applied to blade system during earth cutting as central section is in central and extreme positions, provision of automatic installation of above section in side blade plane and in extreme positions.

9 dwg

FIELD: mechanical engineering.

SUBSTANCE: group of invention relates to boom earth-moving, mine, construction and loading lifting-and-transporting machines of cyclic action. Proposed balancing system contains working equipment, boom hydraulic cylinders and balancing cylinder including hydraulic rod space and gas piston space connected with gas bottle, and distributors. According to first design version, hydraulic rod space of balancing cylinder is connected by hydraulic line with drain into hydraulic tank, and distributor of hydraulic liquid is installed for connecting in one position of spool, of boom hydraulic cylinders working spaces to each other with hydraulic pump. According to second design version, distributor is installed in system for connecting working spaces of boom hydraulic cylinders to each other and with hydraulic pump. According to third design version, rod space of balancing cylinder is connected with distributor installed for connecting, in one position of spool, of rod space of balancing cylinder with into hydraulic tank, and in other position, with hydraulic pump. Distributor is installed in hydraulic line of boom hydraulic cylinders for connecting, in one position of spool, of spaces of boom hydraulic cylinders to each other and with hydraulic pump.

EFFECT: increased capacity of machine owing to higher speed of lifting and lowering of working equipment.

5 cl, 6 dwg

FIELD: mechanical engineering, particularly earth-moving and construction equipment to be operated at low temperatures.

SUBSTANCE: device for hydraulic drive heating comprises heat engine and hydraulic pump kinematically connected with each other. Device also has liquid heat carrier circulation loop including heat accumulator. Heat pipe is connected to heat engine exhaust pipe through two-way valve. Heating member is arranged in tank and linked to heat engine generator.

EFFECT: increased simplicity and efficiency of hydraulic drive heating at negative ambient temperatures.

1 dwg

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