Hydraulic system for mobile machine

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

 

The invention relates to oil hydraulics and can be used in mobile hydraulic machines. It provides in odnonasosnaya hydraulic systems effective and reliable operation of several consumers in different modes of regulation of the pressure.

A known hydraulic mobile machines [1], which includes an adjustable pump, the output of which is communicated through the pressure line with the main distributor for feeding the working fluid to the hydraulic motors operating elements of the machine, tank and kinematically associated with pumping node of the pump cylinder to change the flow of the pump. One of the working cavities of the hydraulic cylinder hydraulically connected to the pressure line, the second working cylinder chamber is connected through two series set dip Bolotnikova valve with drain pipe. Each spool dispenser is made with the two working chambers to control the movement of its valve, one of which is hydraulically connected to pressure pipe, and the other working chamber of one of the valves connected with the working cavity of the hydraulic drive motor for the cutter drive

The closest in technical essence and the achieved result to the claimed izopet the tion is the hydraulic system control [2], containing tank, power adjustable hydraulic pump with sensitive load managing spool, power hydroline protected by a safety valve, main control valve with three position valve with one pressure inlet, two drain lines, two working outlets and two lines, providing connectivity of each working drainage line LS, which has a relief valve and is connected with the control valve.

The disadvantage of this system is that the operating pressure is determined by the most loaded to the consumer. For machines with a large variation of loads on multiple hydraulic motors, this solution requires the use of additional power sources, each of which would provide the relevant Executive authority. This circumstance requires the use of a car several controlled pumps with different pressure control range, which contributes to the complexity of the hydraulic system of the machine, increasing its weight and overall decrease in functional capacity and efficiency of its work.

In addition, in the present system (as in the analog and in the prototype) occurs surge pressure at the end of the stroke, i.e. the hydraulic motor, such as hydrocil the echoes, especially in idle mode. At the time of stop of the piston cylinder in the end position in the pressure cylinder cavity and respectively on the control valve of the hydraulic pump is a pressure surge, slightly higher than the value of the setting of the safety valve of the hydraulic system. Moreover, according to the signal received at the control valve, the pump runs, the maximum pressure in the hydraulic system, greater than the value. These factors contributes to the overpressures and overall reduction of resource and reliability of elements of the hydraulic power unit.

The objective of the invention is to improve the efficiency and reliability of the hydraulic system by regulating the operating pressure and decrease the amount of overpressures in it.

Desired technical results achieved by the fact that the hydraulic system containing tank, power adjustable hydraulic pump with sensitive load managing spool, power hydroline protected by a safety valve, main control valve with three position valve with one pressure inlet, two drain lines, two working outlets and line, providing connectivity of each working drainage line LS, which is connected with a control valve, provided with a control valve level and installed in line LS controllable reducing valve. The inlet and outlet of the pressure reducing valve connected respectively with the valve and control valve, and the control line pressure reducing valve with valve outlet level control pressure inlet and the drain outlet of which is connected respectively with the power hydroline and the tank.

However, the hydraulic system is equipped with a flow regulator, the input and the output of which is communicated respectively with line LS control valve and the tank. Moreover, the flow regulator may be in the form of orifice plates.

In addition, the hydraulic system is equipped with an auxiliary unit, made from pressure reducing valve and an electrically operated two-position four way valve with one pressure line, one of the drain and the two working lines. When this pressure and drain lines four way valve are connected respectively with the output of the pressure reducing valve and the tank, one of the working lines of the distributor - with the first line of the valve control pressure level, and the entrance and drainage pressure reducing valve connected respectively with the power hydrologically and the tank. Moreover, in its initial position four way valve of the first line control unit the pressure level communicated with the tank.

Also, the hydraulic system is equipped with a hydraulic Parking brake, working p is lost which communicated with the working lines of the four way valve auxiliary block.

The problem of increasing the efficiency and reducing the size of overpressures in the hydraulic system is solved by the fact that the line LS of the hydraulic system is equipped with, first, a controlled reducing valve, the output of which is communicated with the control valve, and, secondly, flow regulator, which tells spring cavity of the control valve with the tank. The use of auxiliary unit effective consumers of low pressure, such as hydraulic cylinder of the Parking brake.

The invention is illustrated hydraulic circuit shown in the drawing.

The proposed hydraulic system provides power adjustable hydraulic pump 1 is sensitive to the load managing spool 2, the hydraulic reservoir, power hydroline 4, secure the safety valve 5, the main control valve 6 with a three-position spool 7 and 8, the drain pipe 9 is communicated with the tank 3. Pressure 10, 11 and drain 12, 13 line spools 7 and 8 of the distributor 6 communicated respectively with the power 4 and the drain 9 hose, working the taps 14, 15, 16 and 17 with the working cavities of the motor 18 and the hydraulic cylinder 19, and the lines 20, 21 and valves 22, 23 provide connectivity of each working retraction spools 7 and 8 with line LS 24. Switching spools 7 and 8 in the working position is proportional to elect the magnets 25, 26 and 27, 28 respectively, and in neutral position by springs 29, 30 and 31, 32. In line LS 24 has a controlled pressure reducing valve 33, the inlet 34 and outlet 35 which are connected respectively with the valve 6 and control valve 2. Also, the hydraulic system is equipped with a regulator 36 consumption, auxiliary unit 37 and valve 38 controls the pressure level. The inlet 39 and outlet 40 of the regulator 36 flow communicated respectively with the control valve 2 and the tank 3. Moreover, the controller 36 of the expenditure can be made in the form of orifice plates. The auxiliary unit 37 is made of a pressure reducing valve 41 and is provided with an electromagnet 42 and the return spring 43 two-position four way valve 44 with one pressure line 45, one of the drain 46 and the two working lines 47 and 48. When this pressure 45 and the drain line 46 four way valve 44 are connected respectively with the output of the pressure reducing valve 41 and a drain hydroline 9, and its working line 48 from the first line 49 of the valve 38 controls the pressure level. The inlet 50 and the drain 51 of the pressure reducing valve 41 connected respectively with the power and drain gidrologiya 4 and 9, and in its initial position four way valve 44 of the first line 49 of the valve 38 controls the pressure level communicated with the drain hydroline 9. Line 52 management reducing klapa is 33 communicated with the outlet 53 of the valve 38 controls the pressure level, the drain outlet 54 which is connected through the drain hydroline 9 hydraulic tank 3. The valve 38 controls the level of pressure supplied by a pedal 55.

In addition, the hydraulic system is the hydraulic cylinder 56 Parking brake (not shown), working cavities 57 and 58 which is in communication with the working lines 47 and 48 four way valve 44 of the auxiliary unit 37.

The hydraulic system of a mobile machine operates as follows.

In the neutral position spools 7 and 8 of the main valve 6 pump 1 is in mode zero performance and maintains the pressure (e.g. 2 MPa) in the pressure line 4, given the magnitude of the preload spring on the control valve 2, the pressure in the line LS 24 is missing.

In the initial position of the valve 44 of the auxiliary unit 37 rod cavity 57 of the cylinder 56 is communicated via the auxiliary unit 37 with power hydroline 4 and it is supported by the pressure 2...3 MPa, the upper value is limited to the reducing valve 41. When the hydraulic cylinder 56 creates an additional force circuit normally closed brake, helping to increase the effectiveness of inhibition. Piston chamber 58 of the cylinder 56 and the first line 49 of the valve 38 controls the pressure level communicated with the tank 3 through the drain line 9. Therefore, regardless of the vol pedal position 55 of the valve 38 controls on a managed pressure reducing valve 33 there is no control pressure and is limited to an upper value of pressure in the line LS 24 of the control valve 2 pump 1, which may be, for example, 4...8 MPa, depending on the efforts of the preload spring controlled pressure reducing valve 33, the designated operational characteristics of the working equipment of the machine.

When power is applied, for example, the electromagnet 42 of the distributor 44 its spool is moved into the working position and provides the message to the piston cavity 58 of the cylinder 56 and the first line 49 of the valve 38 controls the power hydroline 4. Due to this breaking occurs Parking brake and allows movement of the machine, and the output control valve 38 and, respectively, in line 52 to control the pressure reducing valve 33 can be obtained a pressure in the range 0,5...2,5 MPa depending on the position of the pedal 55, set by the operator. When this range upper value of pressure in the LS line of the control valve can be 8...28 MPa. Accordingly, when the activities of the individual Executive body in the hydraulic system can be adjusted to the maximum value of the operating pressure in the range of 10...30 MPa. If necessary, the desired control limits can be changed by reconfiguring the valve 38 of the control and the controlled pressure reducing valve 33. Moreover, the lower limit of the pressure in the system should be determined based on the capabilities of R the bots hydraulic system in the idle mode and the health of the least loaded of the Executive body of the machine.

After the inclusion of one of the spools of the distributor 6 its spool 8 will move in proportion to the control signal to the electromagnet 27 (or 28). Pump 1 will increase the flow to create the specified differential pressure regulating edge of the spool 8. The pressure load in a working drain 16 (or 17) (corresponding to the pressure in the pressure cylinder cavity) passes through line 21 and valve 23 in line LS 24 mounted therein controlled pressure reducing valve 33 and later in the spring cavity of the control valve 2. When this occurs, the movement of the hydraulic cylinder 19 with a speed corresponding to the control signal to the electromagnet 27. At low load at the Executive body enables operation of the hydraulic system within the lower limit of the pressure is 10 MPa. The desired pressure that is significantly less than its maximum value, will take place in the case of the stop of the piston cylinder in the lid or the bottom of hydrocylinder due to the presence of controlled pressure reducing valve 33, which provides the possibility of restrictions coming from the pressure cylinder cavity 19 of the pressure control valve 2. This eliminates the overpressures in the hydraulic system at the time of stop of the piston of the hydraulic cylinder 19 in its extreme positions. The regulator 36 flow allows the discharge of fluid from the turn the LS 24 of the control valve 2 and thus also helps to reduce overpressures by reducing the rate of increase of pressure on the control valve 2 at the time of inclusion or sudden stop working body and more rapid reduction of pressure on the spool 2 by disabling the Executive body. In the case of the most loaded actuators can be installed through the pedal 55 maximum pressure in the hydraulic system.

The positive results of the proposed technical solutions:

1. Increasing the reliability and life of the main components of the hydraulic power unit pump drive due to the reduction of overpressures in the power line of the hydraulic system.

2. The proposed hydraulic system provides the ability to control the amount of force or torque on the Executive body by changing the pressure by control valve pressure levels

3. Offer odnonasosnaya hydraulic system ensures efficient operation of mobile machines with multiple actuators with a large variation of load on them, including the operation of auxiliary equipment with consumers of low pressure, such as hydraulic cylinder of the Parking brake.

4. Presents positive results were confirmed conducted at JSC "Krasnoyarsk aluminum plant production testing machine for grooving the periphery of the anode of the electrolytic system, which is made according to the claims.

Sources of information

1. Hydraulic is Kai diagram of the loading machine DB W-1200/2 S. Firm Mannesmann Rexroth, drawing HS-AS-A-163-2.

2. Copyright certificate EN 2150552 C1, CL E 02 F 9/22, 1997

1. The hydraulic system containing tank, an adjustable hydraulic pump with sensitive load managing spool, power hydroline protected by a safety valve, main control valve with three-position spool with one pressure inlet, two drain lines, two working outlets and line, providing connectivity of each working drainage line LS, which is connected with the control valve, wherein the hydraulic system is equipped with a control valve to the pressure level set in the line LS controllable reducing valve, the input and output of which are connected respectively with the valve and control valve, and the control line pressure reducing valve with valve outlet level control pressure the inlet and the drain outlet of which is connected respectively with the power hydroline and the tank.

2. The hydraulic system according to claim 1, characterized in that it is equipped with a flow regulator, input and output, which communicated respectively with line LS control valve and the tank.

3. The hydraulic system according to claim 1, characterized in that it is equipped with an auxiliary unit, which is made of a pressure reducing valve and an electrically operated two-position h is Treklyano dispenser with one pressure line, one of the drain and the two working lines, with the pressure and drain lines four way valve are connected respectively with the output of the pressure reducing valve and the tank, one of the working lines with the first line of the valve control pressure level, and the entrance and drainage pressure reducing valve connected respectively with the power hydroline and the tank, and in the original position four way valve of the first line control unit the pressure level communicated with the tank.

4. The hydraulic system according to claim 1, characterized in that in it the control valve to the pressure level supplied by a foot control.

5. The hydraulic system according to claim 1, characterized in that in it the control valve to the pressure level supplied to the proportional solenoid.

6. The hydraulic system according to claim 3, characterized in that it is equipped with a hydraulic Parking brake, working cavity which is communicated with the working lines of the four way valve auxiliary block.

7. The hydraulic system according to claim 2, characterized in that the flow regulator is made in the form of orifice plates.



 

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