System of hydraulic valves

FIELD: fluid-pressure actuators.

SUBSTANCE: system of hydraulic valves comprises first actuating connection and the second actuating connection which are connected with the hydraulic consumer, system of supplying connections that has the connection with the pressure source and connection with the vessel, first valve system that disconnect the system from the pressure source or controllably connect it with the first actuating connection or the second actuating connection, second system of valves that disconnects the system from the vessel or connects it controllably with the first actuating connection or the second actuating connection, and control unit that controls the first valve system and second valve system. At least one valve system is provided with the pickup of the extent of opening connected with the control unit that controls the valve system depending on the signal from the pickup of the extent of opening and reference signal.

EFFECT: enhanced precision of control.

15 cl, 3 dwg

 

The invention relates to a hydraulic valve system working compounds containing the first working connection and the second working connection is connected to a hydraulic consumer system supplying compounds containing pressure connection and a tank connection, a first valve system, overlying pressure connection or connecting it in a controlled manner with the first working connection or with the second working connection, the second valve system overlying the tank connection or connecting it to a controlled manner with the first working connection or with the second working connection, and a control unit that manages the first and second valve systems.

Such a hydraulic valve device is known from U.S. patent 5568759. From the control lever or joystick receives a special signal to the microprocessor, resulting in the action of the control valves of both valve systems, and the spool of these control valves is connected by springs with the corresponding spool valve system in a way that is spring-tensioned interaction. In many cases, this embodiment of the preferred, because the flow through both valve devices only goes in one direction and the forces acting on the elements of the valve, in essence, do not depend on what upravleniya action hydraulic consumer. However, using such a valve device is difficult to accurately control the consumer, as the friction in the mechanical parts, the hysteresis in the solenoid valves and external forces, such as forces generated by the flow, do not allow the accurate positioning of the valve.

The purpose of the invention is to offer a simple method to accurately control the consumer.

Using a system of valves specified in the introductory part, this has been achieved due to the fact that offered at least one valve system with a sensor opening associated with a control unit that controls the valve system depending on the sensor signal of the degree of opening and the given signal.

With the help gauge the degree of opening of the control unit may set the amount of liquid delivered to the customer or arising from the consumer, depending on whether the sensor opening in the first or second valve system. Depending on the opening degree of the displacement or displacement velocity and, accordingly, the position of the consumer can be controlled relatively precisely.

Preferably, the valve system has the form of a spool valve, and gauge the degree of opening is made in the form of a position sensor that determines the position of the valve. Thus, the degree of opening is no longer determined by the t directly. Since, however, a certain degree of opening corresponds to each position of the slide valve, the slide valve position allows you to indirectly determine the degree of opening. The Hall sensor, the differential inverter linear (DPLP) or any other suitable sensor may be used as the position sensor.

It is useful that the control unit takes into account the non-linear correlation between the position of the valve and the degree of opening of the valve system. This correlation is presented in memory, for example, as a function or table so that the control unit can easily convert the position of the spool in the opening.

Preferably the control unit is connected at least one device to determine the pressure difference, determining a pressure difference in the valve system equipped with a sensor opening. When other characteristics of the valve system is known, the degree of opening and the pressure difference allow us to determine the fluid flow. However, the flow of hydraulic fluid causes the speed of the inclusion of a hydraulic consumer, connected with the working connection. Depending on what kind of system valves equipped with a sensor opening and a device for determination of the pressure input (input readings) or output (output readings) can be precisely controlled./p>

Preferably each working connection is equipped with a pressure sensor, each pressure sensor connected to the control unit. This provides more opportunities for control. Hydraulic consumer can be controlled using the pressure in the working connections.

Preferably, the pressure sensors were part of a device to determine the pressure difference. In this context, the pressure sensors have a dual purpose, namely: determining the difference between the pressures and the determination of the absolute value of the pressure. Then the control unit determines the pressure difference with the third pressure sensor.

It is preferable that the control unit uses a single valve system to control the flow through the working connection, and the other valve system for pressure control in the system of business connections. Thus, depending on the managed system valves and the location of the individual sensors can be implemented on the control ow together with the control input pressure (flow control on the output and the control inlet pressure or flow control of the liquid at the entrance together with control of output pressure (flow control input and control output pressure). In both cases, the speed of the hydraulic consumer can be defined in the Shire the kOhm range, regardless of governors of the loads.

In the first variant embodiment of the device, through the second valve system, the control unit regulates the output from one working connection and through the first valve system regulates the pressure in one working connection with a positive burden on the consumer, and in the other working connection with a negative burden on the consumer. Thus, the flow control on the output and the control pressure at the entrance is easy to implement both positive and negative loads. Negative load mean load acting in the direction of movement of the consumer. When, for example, the consumer is a hydraulic cylinder with a piston, lowering the raised load, the load acts in the direction of movement of the consumer, in order in this case to regulate the pressure in the working connection, the fluid flow at the outlet of which is not adjustable. The pressure control should be understood that the control pressure must be adjusted in accordance with the specified pressure. Of course, the actual pressure can also be determined by measuring in both working connections.

In an alternative embodiment the first valve system control unit adjusts the input stream one working soybeans is inane, and with the second valve system pressure in the same desktop connection. In this case, regulation of the quantity of flowing liquid can be implemented in conjunction with adjustment of the outlet pressure. This control scheme works equally with both positive and negative loads.

It is preferable that the third valve system is located between the two working connections and either closes or opens the connection between the two working connections. The opening may be full or partial. The presence of the third valve device provides additional benefits. For example, when the load goes down, the third valve system is open and fluid is flowing to the working connection associated with increasing its volume of the working chamber of the consumer, no longer passes through the pressure connection. In contrast arising from the other working connection, the fluid may be returned, which saves energy.

It is preferable that consumers have different needs in the liquid from each connection and that the control unit contains an interface unit, which connects to incorporate the third valve system with the inclusion of the first or second valve system. For example, hydromechanics in the form of a cylinder with a piston with a unilateral extension of the piston rod who meet two of the pressure chamber with different cross sections. A pressure chamber in which is located the piston rod has a smaller cross-section than the chamber pressure without stem. Accordingly, when the retraction of the piston rod into the cylinder from the pressure chamber without piston rod flows more fluid enters the chamber pressure with the rod. Excess liquid can be withdrawn through the second valve system. However, when the load goes down, there is a reduction in the pressure chamber with the piston rod, and a high pressure chamber without piston rod must be made more fluid. In this case, begins to work the first valve system.

Preferably, you can install a floating position in which the third valve system connects the two working connections with each other, and the second valve system connects one of the two working connections with the tank connection. In many cases it is necessary to combine both working connection to the tank connection to achieve the free mobility of the hydraulic consumer. This floating position easy to install, as shown in the application materials.

Preferably established only three pressure sensors, two of which determine the pressure at the working connection, and one determines the pressure of or in connection pressure or in connection with the tank. Thus, rather Rel is a relatively small number of sensors. Of course, in the case of the valve system can provide space for additional sensors. This can be done with little cost. Depending on the task (measuring input or measurement of the output)can be set by the individual pressure sensors.

Also, it is preferable to use only one sensor opening located either in the first or second valve system. Here applies the same conditions as for the pressure sensors. To increase the versatility of the valve system will be enough of a relatively small number of sensors, as well as by providing them with additional space.

Preferably all working connections are located on one side of the housing, in which the system is installed valves. This allows you to place the connecting pipes on the same side of the valve. Thus, it is possible to simplify the construction of the body.

The invention described in detail hereinafter on the basis of the preferred variants of the embodiment shown in the drawings, in which

figure 1 is conventionally depicted hydraulic valve system;

conventionally depicted in figure 2 controls the degree of opening of the valve;

figure 3 is conventionally depicted the design of the valve system.

Hydraulic system 1 valve contains two working connections A, the, connected to a hydraulic consumer 2. In this case, the hydraulic consumer 2 is a cylinder with a piston, lifting a weight of 3. For example, a cylinder with a piston mounted on the tractor, the lifting devices of the plow or other devices.

The consumer consists of a cylinder 4 located therein by the piston 5. On the one hand the piston 5 is connected to a rod 6 of the piston acting on the load 3. Accordingly, the first pressure chamber 7 has a larger cross-section than the second pressure chamber 8. The first pressure chamber 7 is connected with the working connection A. the Second working chamber 8 is connected with the working connection Century.

Filing required to manage consumer pressure occurs through connection P is pressure, which may be associated with a pump or other pressure source, not shown in detail. At the connection point P of the pressure sensor 9 pressure determines the pressure PP, that is, the pressure connection of the pressure.

In figure 1 the pressure sensors shown in all the places where they can be established in principle. However, as will be shown below, the pressure sensors in all the provisions for the operation of the valve system is not required. However, it is expedient to provide space for pressure sensors in all of these provisions.

Through the first 10 valves connect the s P pressure associated with the two working connections A, Century, the First system 10 of the valve is made in the form of a spool valve with a valve 11 is held in neutral position by springs 12, 13, in this position, the connection between the connection P of the pressure and the two working connections a, b is broken. When the valve 11 is shifted, the first valve system creates a connection or connection between the pressure P and a working connection a or connection between the pressure P and the other working connection Century.

The position sensor 14 determines the position of the spool 11. Since the position of the spool 11 at the same time, expresses the degree and width of opening of the first valve system, the position sensor 14 is also referred to as the sensor 14 to the degree of opening. The sensor 14 to the degree of opening produces a signal x supplied to the control unit 15.

The first system 10 of the valves controls the control valve, that is, the control valve 16 with magnetic or other actuator 17, controlled by the control unit 15. The control valve 16 takes the pressure from the control connection of the RS-pressure to the first front wall of the spool 11 and connects the second front wall of the spool 11 with connection T with the tank. In this case the movement of the spool 11 in the same direction. Or control valve 16 connects the second front wall with connection P of the pressure and the first front wall with the connection of the T tank. In this case the movement of the valve 11 is in the other direction. When the control valve 16 is shown neutral position, the valve 11 also moves in the shown neutral position.

Flow through the first system 10 of the valve, therefore, will always have the same direction, regardless of which of the two working connections a, b is operated under pressure.

The second system 18 of the valve has a similar structure, i.e. it contains the valve 19 is held in the shown neutral position by the springs 20, 21. The second system 18 of the valve contains a position sensor 22, which generates a signal reflecting the position of the valve 19 in the second system 18 of the valve and thereby the degree of opening. This signal is also supplied to the control unit 15.

When the spool 19 is shifted from its neutral position, the second valve system 18 connects the connection T with the tank or with the first work connection a or the second working connection Century. In the shown neutral position of the spool 19, the connection is fully closed.

In connection with the tank is a pressure sensor 23, which determines the pressure value Pt and transmits it to the control unit 15.

Similarly, the control valve controls the second system 18 of the valve, that is, the control valve 24, and the lock 15 control activates its magnetic or other actuator 25, bias the spool in the process of adjusting the hydraulic pressure.

In working connection And installed the 30 gauge pressure, which determines the pressure of the RA. In a working connection In the installed sensor 31 pressure determines the pressure Pb. Thus, the pressure sensors 30, 31 define the pressure in the working connections a, b, respectively, and transmit the data to the control unit 15.

In the depicted valve device, there are various modes of operation. Required sensors will be indicated below.

In principle there are two ways to control the valve system 1. To simplify the following explanation, it is assumed that the second working connection In a fluid is supplied under pressure, as from the first working connection And the fluid flows back to the connection T with the tank.

The first is the regulation of the flow of the effluent and the pressure in the working connection b, which enters the liquid. In this case, the moving speed of the user 2, i.e. the movement of the load 3 can be controlled by controlling the second system 18 of the vehicle. The first system 10 of the valve regulates the pressure level in the consumer 2.

In this case, the pressure sensor 23 must be located in connection with the tank. This pressure sensor 23 allows the control unit 15, together with the signal RA pressure sensor 30 pressure, to determine the spacing is pressure in the second system 18 of the vehicle. Also use the position sensor or the sensor 22 to the degree of opening, which allows to determine the degree of opening of the second valve system 18. Knowing the difference between the pressure in the second system 18 of the valve and the degree of opening, it is possible to determine the volume flow from the chamber 7 of the pressure through the first working connection. Of course, in determining the volumetric flow ought to take into account additional factors, however, or the same or, at least, known to the second system 18 of the vehicle.

For this purpose, "control flow output and pressure control at the entrance" you only need three sensors 23, 30, 31 pressure and one position sensor 22. The sensor 31 and the pressure required during the reverse movement of the consumer 2.

When a positive load from the load 3, that is, when the force from the weight of the 3 acts in a direction different from the direction of movement of the piston 5, the degree of opening of the first system 10 of the valve is adjusted to obtain the desired pressure in the first working connection A. This is the desired pressure and/or the desired speed of the load 3 and, thus, the desired volumetric flow rate set to the control unit 15 via the control inputs of the PS or VS, respectively, for example, by using the joystick.

Alternatively, the position of the first system 10 valves or, rather, the position of the valve 11 can also be regulated is to depending on the pressures Pa, Pb in two working connections a, b, when set to the desired pressure values.

At negative loads, i.e. when the force from the weight of the 3 acts in the same direction as the movement of the piston 5, the degree of opening of the first system 10 of the valve, i.e. the valve position 11, set depending on the desired pressure level in the working connection and the measured pressure Pb in the second working connection C. alternatively, the position of the spool in the first system 10 of the valve can also be adjusted based on the desired pressure levels RA, Pb in two working connections a, b and the measured pressure levels.

In alternative mode use the control input and control output, i.e., "flow control input and control output pressure". In this case, the first system 10 of the valve regulates the speed of the consumer 2, and the second system 18 of the valve regulates the pressure level in the consumer.

In this case, you should use the sensor 9 pressure connection P of the pressure and the position sensor 14 is in the first system 10 valves. The pressure sensor 23 and the position sensor 22 is not needed here.

The desired position of the valve 11 is determined on the basis of the difference between ΔP pressure between the pressure PP in the connection P of the pressure and pressure of RA in the first working connection a and the desired value is m volumetric flow rate Qr (figure 2). The result is the desired cross-section of Ar flow for the first system 10 valves. Then, using the coefficient of the valve, as appropriate depending on the position, this cross-section of the flow transform of a function f(Ar) in the signal xr provisions supplied to the point 32 of the sum representing the part of the controller 33. Point 32 summation connected with the control valve 16, which acts on the first system 10 of the valve to change the position of the valve 11 when the actual position x of the valve 11 does not match the target position xr. For simplicity, additional elements of the controller, such as amplifiers and the like, not shown. Eventually, reach a position in which the volume flow Q through the first system 10 of the valve matches the given volumetric flow rate Qr. Since this volumetric flow rate Q, at the same time, contains information about the speed of the piston 5 2 user, you can use the integrated volumetric flow rate Q or dependent values relatively accurately determine the position of the piston 5 2 user and, therefore, the position of the cargo 3.

Both positive and negative loads the second system 18 valves are used to ensure that the pressure in the second working connection To match the specified value is Alenia.

In both modes of operation need only the position sensor 14, 22 in the valve system, which determines the difference ΔP pressures.

Between the two working connections a, b is the third system 26 valve with floating directly by an electromagnetic actuator 28 of the valve 27. In the form shown in the drawing the rest position established by means of a spring 29, the third system 26 of the valve closes the connection between the two working connections a, b or, when the valve 27 is switched to the position not shown here connects the two working connections a And C.

This third system 26 of the valve set at the discretion of, i.e., it is not necessary. However, its presence gives the advantages described below.

For negative load can be the function of regeneration. For example, when the load 3 is lowered (this corresponds to moving from right to left in figure 1), the liquid flowing from the chamber 7 of the pressure, may be re-filed into the chamber 8 of the pressure. Since the pressure chamber 8 increases its volume is not in the least, which reduces its volume of the pressure chamber 7, there is too much fluid produced through a system of valves 18. When the opposite conditions, that is, a negative load, the pressure chamber 7 increases its volume faster than the camera 8 pressure, and fluid flow, respectively, will PR is to proceed through the first system 10 valves. Thus, with the consumer having substantially different contact surface pressure, the control unit 15 always manages third system 26 valves or together with the first system 10 of the valve, or from the second system 18 of the vehicle.

In the first case, i.e. when the control system 18 of the valve position sensor 22 and the sensor 30 pressure appropriate to use in conjunction with the pressure sensor 23.

When the pressure chamber 7 increases its volume faster than it reduces its volume of the pressure chamber 8, the first system 10 of the valves will be used together with the third system 26 of the valves. In this case, will be used, the position sensor 14, the sensor 30 pressure and the pressure sensor 9.

In many cases it is necessary to connect the two working connections a, b with connection T with the tank at the same time to obtain the working connections a, b without pressure. In this case, to do it relatively simply, by joining the two working connections a, b via the third system valves 26 and, at the same time, two working connections a, b with the tank T through the second valve system 18.

In particular, the use of a valve system for a tractor or other farm machinery, may be necessary to implement half-floating position. This situation, for example, is necessary when the tractor pulls a plow handles the ground at a certain operating depth. In the event of a collision with a rock or other obstacle, the plow should be able to move up without significant resistance to this movement (of course, except for gravity). After overcoming obstacles plow should be able to return to a predetermined working depth.

In this case, it is fairly easy to implement. Again, the assumption was made that the pressure in the working connection And serves the purpose of lifting 3, in this case - plough. Here, the second valve system 18 is used as a valve that controls the pressure. When the pressure Pb in the second working connection due to the buoyancy of the plow from the ground obstacle exceeds a certain limit value, the second valve system 18 creates a connection between the second working connection b and connection T with the tank for draining fluid from the second chamber 8 of the pressure. Using the first system 10 of the valve the fluid in the volume required to lift the load 3, fed to the first pressure chamber 7. In this case, the control unit 15 determines the degree of opening and the duration of maintaining the degree of opening of the first system 10 of the valve, and the pressure difference ΔR in the first system 10 valves. Thus, the control unit 15 can relatively accurately determine the change in the load position 3.

When the pressure Pb in the second operating link is In again drops below the limit value, the piston 5 is again moved in the opposite direction to lower the load 3. In this case, the liquid flows from the connection P of the pressure through the first system 10 valves. From the first chamber 7 of the pressure fluid escapes through the second system 18 of the vehicle. In this case, the control unit 15 now just have to put the system 10 of the valve forward, that is, to hold the spool 11 in the opposite direction during the same time as before, when the load 3 was raised. This operating mode is relatively easy to implement. When the desired load position 3, the movement will be stopped. Of course, you can also use the position sensor.

Thus, the user 2 can constantly hold the load in position in the absence of external forces, lifting a weight of 3.

Figure 3 is conventionally depicted mechanical design of such a system 1 valves. The same elements have the same number of positions as in figure 1.

In the housing 34 spools 11 and 19 are parallel to each other. Two working connections a, b are positioned on a front wall 35 of the housing 34, which simplifies the mounting of the connecting pipes.

Using the described valve device and shows the modes obtained the following benefits: topological diagram of the valves based on independently managed separately control the dummy holes, implemented using the first system 10 of the valve or the second valve system 18. Thus, the speed of the user 2 and the pressure level at which he works, can be installed essentially independently from each other.

Simple operation requires only one position sensor. Only when the third system 26 of valves used in a floating or semi-floating mode, it might make sense to install two position sensor.

The valve system allows you to easily install half-floating mode, that is, to prevent the movement of the load 3 under the action of external forces only in one direction, while movement in the other direction is blocked. Usually this is only possible with hydraulic cylinders single acting, traditionally used in holders mounted equipment tractors. When using cylinder double acting, as in this case, the holders may perform additional functions, such as the rise of the tractor.

The third system 26 of the valve allows easy control of negative loads, without requiring additional quantities of oil from the connection of the P pump.

1. A hydraulic valve system working compounds containing the first working connection and the second working connection is connected to the hydraulic will consume the LEM, system supplying compounds containing pressure connection and a tank connection, a first valve system, overlying pressure connection or connecting it in a controlled manner with the first working connection or with the second working connection, the second valve system overlying the tank connection or connecting it in a controlled manner with the first working connection or with the second working connection, and a control unit that manages the first and second valve systems, characterized in that at least one system (10, 18) of the valve has a sensor (14, 22) of the opening degree of which is connected with the block (15) control and block (15) control is used to control the operation of the system (10, 18) of the valve depending on the sensor signal (14, 22) the degree of opening and the specified signal (PS, VS).

2. A hydraulic valve according to claim 1, characterized in that the system (10, 18) of the valve is made in the form of a spool valve, and a sensor (14, 22) the degree of opening is made in the form of a position sensor that determines the position of the valve (11,19).

3. A hydraulic valve according to claim 2, characterized in that the block (15) management takes into account the non-linear correlation between the position of the valve (11,19) and the degree of opening of the system (10,18) valves.

4. A hydraulic valve according to claim 1, characterized in that the block is (15) the control is connected, at least one device(30, 23; 31, 23; 30, 9; 31, 9) determine the pressure difference, determining a pressure difference in the system (10, 18) valve, provided with a sensor (14, 22) the degree of opening.

5. A hydraulic valve according to claim 1, characterized in that each working connection (a, b) has a sensor (30, 31) pressure, and each sensor (30, 31) of the pressure connected with a block (15) of the control.

6. A hydraulic valve according to claim 5, characterized in that the sensors (30, 31) pressure form part of the device determine the differential pressure.

7. A hydraulic valve according to any one of claims 1 to 6, characterized in that the block (15) control of one system (10, 18) valve is designed to control the flow through the working connection (a, b) and another system (18, 10) valves to control the pressure (PA, Pb) in working connection (a, b).

8. A hydraulic valve according to claim 7, characterized in that the unit (15) controls are designed to regulate the flow at the outlet of one working connection (a, b) using the second system (18) of the valve and with the possibility of adjusting the pressure in one working connection (a, b) when a positive load on the consumer and in the other working connection (A) when a negative burden on the consumer by means of the first system (10) valves.

9. The system of hydraulic valves at p., characterized in that the block (15) is a control with adjustable input stream one working connection (a, b) using the first system (10) of the valve and with the possibility of adjusting the pressure in the same working connection (a, b) using the second system (18) valves.

10. A hydraulic valve according to any one of claims 1 to 6, characterized in that at least one system (10, 18) of the valve is arranged to actuate a control valve (16, 24).

11. A hydraulic valve according to any one of claims 1 to 6, characterized in that there is a third system (26) of the valve located between the two working connections (a, b) with the ability to either block or open a connection between the two working connections (a, b).

12. A hydraulic valve according to claim 11, characterized in that the consumer (2) require different amounts of fluid from the two working connections (a, b) and the block (15) contains a control device connecting the inclusion of a third system (26) of the valve with the inclusion of the first or second system (10, 18) valves.

13. A hydraulic valve according to claim 11, characterized in that it has the ability to install a floating position in which the third system (26) of the valve connects the two working connections (a, b) with each other and the second system (18) KLA the ANOVA connects one of the two working connections (A, C) with compound (T) with the tank.

14. A hydraulic valve according to any one of claims 1 to 6, characterized in that there are only three pressure sensor(9, 30, 31; 23, 30, 31), two of which are designed to determine the pressure in the working connections (a, b) and one to determine the pressure in the connection (P) pressure, or in connection (T) with the tank.

15. A hydraulic valve according to any one of claims 1 to 6, characterized in that there is only one sensor (14, 22) degree opening located or in the first system (10) of the valve, or in the second system (18) valves.

16. A hydraulic valve according to any one of claims 1 to 6, characterized in that all working connections (a, b) are located on the same wall (35) of the housing (34), in which the system is installed (1) valves.



 

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