Hydraulic loop system

Abstract

The invention provides a hydraulic circuit system, and relates to the technical field of hydraulic control devices, a first outflow channel and a second outflow channel are arranged on a main oil inlet path and at the downstream of a one-way valve, and the first outflow channel is communicated with an energy accumulator; the number of the reversing valves is multiple, one reversing valve corresponds to one hydraulic cylinder, and the reversing valves communicate with rod cavities and rodless cavities of the hydraulic cylinders through first cylinder body branches and second cylinder body branches correspondingly. The multiple oil inlet branches are arranged, one oil inlet branch corresponds to one hydraulic cylinder, one ends of the multiple oil inlet branches communicate with the second outflow channel, and the other ends of the multiple oil inlet branches communicate with the corresponding reversing valves correspondingly. Any oil inlet branch is provided with a pressure adjusting device used for adjusting the pressure in the pipeline. The number of the oil return branches is multiple, one oil return branch corresponds to one hydraulic cylinder, and any oil return branch communicates with the corresponding reversing valve. And the main oil return path is communicated with the oil return branch, so that the hydraulic cylinders can stably, synchronously or independently extend and retract.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic control devices, and in particular to a hydraulic circuit system. Background Art

[0002] The hydraulic system often includes a hydraulic pump, a control valve, and a hydraulic cylinder. The hydraulic pump is used to pump out pressurized hydraulic oil. The control valve controls the flow direction and flow rate of the hydraulic oil. The hydraulic cylinder works with the hydraulic oil provided by the control valve. At present, in order to stably control the hydraulic cylinder and ensure the stability of the hydraulic oil pressure in the pipeline, it is often necessary to add an energy replenishment buffer device in the hydraulic circuit of a hydraulic cylinder, that is, one energy replenishment buffer device can only control one hydraulic cylinder. However, in a production line or equipment composed of multiple hydraulic cylinders, the energy replenishment buffer device needs to be set in the hydraulic circuit of each hydraulic cylinder, which will make the overall hydraulic circuit layout more complicated, the device cost and the use cost higher, occupy a large space, and difficult to maintain.

[0003] Therefore, there is an urgent need to propose a hydraulic circuit system that can stably control multiple hydraulic cylinders at the same time through a hydraulic circuit system, and ensure good pressure stability in the hydraulic circuit system, so that each hydraulic cylinder can stably perform lifting and lowering operations synchronously or independently. Summary of the invention

[0004] The object of the present invention is to provide a hydraulic circuit system to solve the problems existing in the above-mentioned prior art. Through a hydraulic circuit system, multiple hydraulic cylinders can be controlled stably and accurately at the same time, ensuring the stability of the overall pressure in the hydraulic circuit system, so that multiple hydraulic cylinders can stably and synchronously or independently extend and retract operations.

[0005] To achieve the above-mentioned purpose, the present invention provides the following scheme: a hydraulic circuit system is provided, comprising: a main oil inlet circuit, a one-way valve is arranged on the main oil inlet circuit; the main oil inlet circuit is connected to an oil tank, a first outflow channel and a second outflow channel are arranged on the main oil inlet circuit downstream of the one-way valve, the first outflow channel is connected to an accumulator; a reversing valve, the reversing valve comprises a plurality of reversing valves, and one reversing valve corresponds to one hydraulic cylinder, the reversing valve is used to switch the oil circuits for oil inlet and oil outlet of a rod chamber and a rodless chamber, the reversing valve is respectively connected to the rod chamber and the rodless chamber of the hydraulic cylinder through a first cylinder body branch and a second cylinder body branch; An oil inlet branch, wherein the oil inlet branches include multiple ones, and one of the oil inlet branches corresponds to one of the hydraulic cylinders, one end of each of the multiple oil inlet branches is connected to the second outflow channel, and the other end is respectively connected to the corresponding reversing valve; any one of the oil inlet branches is provided with a pressure regulating device for regulating the pressure in the pipeline; an oil return branch, wherein the oil return branch includes multiple ones, and one of the oil return branches corresponds to one of the hydraulic cylinders, and any one of the oil return branches is connected to the corresponding reversing valve; a main oil return circuit, wherein the main oil return circuit is connected to the oil return branch, and the outlet end of the main oil return circuit is connected to the oil tank.

[0006] Preferably, the pressure regulating device comprises a proportional pressure reducing valve arranged on the oil inlet branch, and the proportional pressure reducing valve is used to regulate the pressure of the oil entering the reversing valve.

[0007] Preferably, the proportional pressure reducing valve is provided with an oil unloading port, and the oil unloading port is communicated with the corresponding oil return branch.

[0008] Preferably, hydraulic locks are provided on both the first cylinder branch and the second cylinder branch.

[0009] Preferably, the reversing valve is a two-position four-way solenoid valve.

[0010] Preferably, the first cylinder branch and / or the second cylinder branch is also connected to a safety valve for adjusting the maximum pressure of the hydraulic cylinder.

[0011] Preferably, a high-pressure filter is provided in the main oil inlet circuit, and the high-pressure filter is located upstream of the one-way valve.

[0012] Preferably, a first pressure regulating valve is connected between the high-pressure filter and the oil tank.

[0013] Preferably, an electromagnetic shut-off valve and a second pressure regulating valve are provided in a pipeline connecting the accumulator and the main oil inlet line.

[0014] Preferably, the oil drain port of the accumulator is also connected to a manual stop valve.

[0015] Compared with the prior art, the present invention has achieved the following technical effects:

[0016] After the hydraulic oil passes through the one-way valve, one path is output from the first outflow channel to the accumulator to make the accumulator work; the other path is to inject the hydraulic oil into multiple oil inlet branches through the second outflow channel; the oil pressure in the oil inlet branch is adjusted by the pressure regulating device to make the oil pressure in each hydraulic cylinder branch within the preset range. After that, the hydraulic oil in the oil inlet branch is passed into the corresponding reversing valve, and the hydraulic oil is injected into the rod chamber or rodless chamber of the hydraulic cylinder through the first cylinder branch or the second cylinder branch respectively to control the extension or retraction of the hydraulic cylinder. The return oil of the hydraulic cylinder flows into the corresponding reversing valve through the first cylinder branch or the second cylinder branch, and then passes into the corresponding return oil branch through the reversing valve. The hydraulic oil in the return oil branch then flows back to the oil tank through the main return oil channel. The accumulator can be used to replenish hydraulic oil in the main oil inlet and the second outflow channel to form a supplementary power source. When the pressure in the main oil inlet is too high, the accumulator can also recover the hydraulic oil in the main oil inlet, thereby regulating the pressure in the main oil inlet. The accumulator can replenish, buffer and stabilize the pressure of the main oil inlet and the second outflow channel, so that the pressure in the main oil inlet and the second outflow channel can be stably regulated, ensuring the stability of the pressure of the hydraulic oil entering the oil inlet branch, so that the pressure in the oil inlet branch is within a preset range. The present invention can accurately and efficiently regulate the oil pressure on each hydraulic cylinder branch through a pressure regulating device, and can effectively inject hydraulic oil into multiple hydraulic cylinders through a reversing valve to ensure the stable operation of each hydraulic cylinder. The present invention can stably and accurately control multiple hydraulic cylinders at the same time through a hydraulic circuit system, ensuring the stability of the overall pressure in the hydraulic circuit system, so that multiple hydraulic cylinders can stably and synchronously or individually extend and retract. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 It is a schematic diagram of the overall system of the present invention.

[0019] Among them, 1. main oil inlet circuit; 2. reversing valve; 3. oil inlet branch; 4. oil return branch; 5. main oil return circuit; 6. one-way valve; 7. first outflow channel; 8. second outflow channel; 9. accumulator; 10. hydraulic cylinder; 11. first cylinder branch; 12. second cylinder branch; 13. proportional pressure reducing valve; 14. oil drain line; 15. hydraulic lock; 16. safety valve; 17. pressure sensor; 18. high-pressure filter; 19. first pressure regulating valve; 20. solenoid stop valve; 21. second pressure regulating valve; 22. manual stop valve. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Please refer to Figure 1 As shown, a hydraulic circuit system is provided in this embodiment, including a main oil inlet 1, a reversing valve 2, an oil inlet branch 3, an oil return branch 4, and a main oil return 5; one end of the main oil inlet 1 is connected to the oil tank, and a one-way valve 6 is arranged on the main oil inlet 1. The main oil inlet 1 is divided into two oil outlet channels downstream of the one-way valve 6, namely a first outflow channel 7 and a second outflow channel 8, and the first outflow channel 7 is connected to the accumulator 9. There are multiple reversing valves 2, and each reversing valve 2 corresponds to a hydraulic cylinder 10. The reversing valve 2 is used to switch the oil inlet and outlet channels of the rod chamber and the rodless chamber of the hydraulic cylinder 10. The reversing of the reversing valve 2 is used to realize the pushing out and retracting of the hydraulic cylinder 10. The reversing valve 2 is connected to the rod chamber and the rodless chamber of the hydraulic cylinder 10 through the first cylinder branch 11 and the second cylinder branch 12. There are multiple oil inlet branches 3, the inlet end of the oil inlet branch 3 is connected to the second outflow channel 8, the outlet end of the oil inlet branch 3 is connected to the oil inlet of the corresponding reversing valve 2, and the multiple oil inlet branches 3 are connected in parallel, and the oil inlet branches 3 are respectively connected to the corresponding hydraulic cylinders 10. The oil return branch 4 is connected to the oil return port of the corresponding reversing valve 2, and the other end of the oil return branch 4 is connected to the inlet end of the main oil return line 5. The outlet end of the main oil return line 5 is connected to the oil tank.

[0023] Working principle: Start the hydraulic pump to allow the hydraulic oil in the oil tank to enter the main oil inlet 1. After the hydraulic oil passes through the one-way valve 6, the one-way valve 6 can prevent the oil from flowing back. One way flows out from the first outflow channel 7 and enters the accumulator 9, injecting hydraulic oil into the accumulator 9 to increase the pressure of the accumulator 9 and perform energy storage operations. The other way injects the hydraulic oil into multiple oil inlet branches 3 through the second outflow channel 8. The oil pressure in the oil inlet branch 3 is adjusted by the pressure regulating device so that the oil pressure in the oil inlet branch 3 is within the preset range. After that, the hydraulic oil in the oil inlet branch 3 is passed into the corresponding reversing valve 2. The reversing valve 2 can be reversed and can inject hydraulic oil into the rod chamber or rodless chamber of the hydraulic cylinder 10 through the first cylinder branch 11 or the second cylinder branch 12 respectively to control the extension or retraction of the hydraulic cylinder 10. The return oil of the hydraulic cylinder 10 flows into the corresponding reversing valve 2 through the first cylinder branch 11 or the second cylinder branch 12, and then flows into the corresponding return oil branch 4 through the reversing valve 2. The hydraulic oil in the return oil branch 4 flows into the main return oil path 5, and finally flows back to the oil tank. The hydraulic oil can be supplemented to the main oil inlet path 1 and the second outflow channel 8 through the accumulator 9 to form a supplementary power source. When the pressure in the main oil inlet path 1 is too high, the accumulator 9 can also recover the hydraulic oil in the main oil inlet path 1, thereby regulating the pressure in the main oil inlet path 1. The accumulator 9 can replenish, buffer and stabilize the main oil inlet 1 and the second outflow channel 8, so that the pressure in the main oil inlet 1 and the second outflow channel 8 can be stably regulated, ensuring the stability of the pressure of the hydraulic oil entering the oil inlet branch 3. The pressure can be further regulated accurately and efficiently through the pressure regulating device, so that the pressure in the oil inlet branch 3 is within the preset range, and the hydraulic oil can be effectively injected into the multiple hydraulic cylinders through the reversing valve 2 to ensure the stable operation of each hydraulic cylinder 10. The present invention can stably and accurately control multiple hydraulic cylinders 10 at the same time through a hydraulic circuit system, ensuring the stability of the overall pressure in the hydraulic circuit system, and allowing each hydraulic cylinder 10 to extend and retract synchronously or individually.

[0024] In one embodiment, three groups of hydraulic cylinders 10 are provided, that is, three groups of reversing valves 2 , oil inlet branches 3 and oil return branches 4 matching the hydraulic cylinders 10 are provided and connected to the corresponding hydraulic cylinders 10 respectively.

[0025] In one embodiment, the pressure regulating device includes a proportional pressure reducing valve 13, which is arranged on the oil inlet branch 3. The proportional pressure reducing valve 13 can control the pressure in the oil inlet branch 3 located downstream thereof to achieve different pressure levels in the oil inlet branch 3. The proportional pressure reducing valve 13 changes the pressure after the valve by utilizing the pressure difference generated by the different load areas at both ends of the piston inside the valve body, thereby reducing the pressure on the oil inlet branch 3, thereby ensuring that the pressure of the hydraulic oil entering the reversing valve 2 and the hydraulic cylinder 10 is within the required range, thereby ensuring the stable operation of the hydraulic cylinder 10.

[0026] In this embodiment, the proportional pressure reducing valve 13 is provided with an oil discharge port, and the oil discharge port is connected to the corresponding oil return branch 4 through the oil drain line 14. That is, the oil discharge port of the proportional pressure reducing valve 13 is connected to the oil return branch 4 connected to the same hydraulic cylinder 10. When the pressure in the proportional pressure reducing valve 13 exceeds the set value, the excess hydraulic oil can be discharged to the oil return branch 4 through the oil drain line 14 to maintain the stability of the system pressure.

[0027] In this embodiment, a hydraulic lock 15 is provided on both the first cylinder branch 11 and the second cylinder branch 12. When the hydraulic lock 15 is in a locked state, the hydraulic oil in the first cylinder branch 11 or the second cylinder branch 12 can be locked to prevent the flow of the hydraulic oil, and the hydraulic cylinder 10 can be pressurized by the hydraulic lock 15. The hydraulic lock 15 can stop the oil cylinder at any position during the working process.

[0028] In one embodiment, the reversing valve 2 is a two-position four-way solenoid valve. Preferably, the two-position four-way solenoid valve includes a P port, a T port, an A port, and a B port, which respectively represent the main oil inlet P, the working oil inlet A, the working oil return port B, and the main oil return port T. Ports A and B are also reversing oil ports. Port A is for oil inlet, and port B is for oil return. Port A is connected to the oil inlet branch 3; port B is connected to the oil return branch 4. When the oil reaches the two-position four-way solenoid valve, the hydraulic cylinder 10 (oil cylinder) is pushed out and retracted according to the power supply status of the two-position four-way solenoid valve.

[0029] In one embodiment, a safety valve 16 is further connected to the first cylinder branch 11 or the second cylinder branch 12, preferably the second cylinder branch 12, and the preset pressure in the safety valve 16 matches the maximum allowable pressure of the plug chamber in the hydraulic cylinder 10. The maximum allowable pressure of the plug chamber of the hydraulic cylinder 10 can be set by the safety valve 16. When the load increases, the pressure is greater than the set value, and the excess oil overflows back to the oil tank through the safety valve 16. A pressure sensor 17 is also provided on the connecting pipeline of the safety valve 16, and the pressure signal can be converted into an analog quantity by the pressure sensor 17, so that the maximum working pressure can be set more intelligently and safely.

[0030] In one embodiment, a high-pressure filter 18 is provided in the main oil inlet line 1, and the high-pressure filter 18 is located upstream of the one-way valve 6. The high-pressure filter 18 can filter the oil, so that the oil entering the proportional pressure reducing valve 13 has a higher cleanliness, and the proportional pressure reducing valve 13 is prevented from being stuck. Preferably, a pressure sensor 17 and a first pressure regulating valve 19 are connected to the main oil inlet line 1 between the high-pressure filter 18 and the oil tank. The pressure in the main oil inlet line 1 can be adjusted by the first pressure regulating valve 19.

[0031] In one embodiment, an electromagnetic stop valve 20 is provided in the pipeline connecting the accumulator 9 and the main oil inlet circuit 1. When working, the electromagnetic stop valve 20 is a normally open valve, and the hydraulic oil flowing out of the first outflow channel 7 of the main oil inlet circuit 1 enters the accumulator 9 through the electromagnetic stop valve 20. The accumulator 9 is also connected to a second pressure regulating valve 21 through a pipeline, and the pressure in the connecting pipeline of the accumulator 9 can be adjusted through the second pressure regulating valve 21. The accumulator 9 is also connected to a manual stop valve 22. When the system is shut down for maintenance, the manual stop valve 22 is opened to discharge the pressure oil in the accumulator 9. Generally, the manual stop valve 22 is closed.

[0032] During operation, the high-pressure oil in the oil tank passes through the first pressure regulating valve 19, which can adjust the system pressure, and reaches the one-way valve 6 through the high-pressure filter 18. The oil is filtered by the high-pressure filter 18 to improve the cleanliness of the oil; then the pressure oil passes through the one-way valve 6, and the one-way valve 6 prevents the oil from flowing back; the oil flowing out of the first outflow channel 7 reaches the electromagnetic stop valve 20 in the normally open state, and then enters the accumulator 9. The accumulator 9 serves as a supplementary power source to replenish the system, buffer, and stabilize the pressure. The oil flowing out of the second outflow channel 8 reaches the proportional pressure reducing valve 13 in the oil inlet branch 3. Through the proportional pressure reducing valve 13, the required pressure of the circuit can be set according to the work needs. After passing through the proportional pressure reducing valve 13, the oil reaches the two-position four-way solenoid valve, and the hydraulic cylinder 10 is pushed out and retracted according to the power supply of the two-position four-way solenoid valve. The hydraulic oil flows through the hydraulic lock 15 on the first cylinder branch 11 and enters the rodless chamber or rod chamber of the hydraulic cylinder 10, thereby injecting hydraulic oil with stable pressure into the hydraulic cylinder 10 to make the hydraulic cylinder 10 move, and the return oil in the rodless chamber or rod chamber is passed into the second cylinder branch 12. The hydraulic lock 15 in the first cylinder branch 11 and the second cylinder branch 12 can play a role in maintaining pressure during operation, and can stop the oil cylinder 10 at any position during the operation. The hydraulic lock 15 releases the locking state, and the hydraulic oil passes through the hydraulic lock 15 and enters the two-position four-way solenoid valve, and then flows back to the corresponding oil return branch 4 through the two-position four-way solenoid valve, and then the return oil is collected in the main oil return line 5, and the hydraulic oil flows back to the oil tank through the main oil return line 5.

[0033] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numerals in the claims should not be regarded as limiting the claims involved.

[0034] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A hydraulic circuit system, characterized in that: include: A main oil inlet passage (1), wherein a one-way valve (6) is provided on the main oil inlet passage (1); the main oil inlet passage (1) is connected to an oil tank, and a first outflow passage (7) and a second outflow passage (8) are provided on the main oil inlet passage (1) downstream of the one-way valve (6), wherein the first outflow passage (7) is connected to an accumulator (9); A reversing valve (2), the reversing valve (2) comprising a plurality of reversing valves (2), one reversing valve (2) corresponding to one hydraulic cylinder (10), the reversing valve (2) being used to switch the oil inlet and outlet paths of the rod chamber and the rodless chamber, the reversing valve (2) being connected to the rod chamber and the rodless chamber of the hydraulic cylinder (10) respectively through a first cylinder branch (11) and a second cylinder branch (12); An oil inlet branch (3), the oil inlet branch (3) comprising a plurality of oil inlet branches, and one oil inlet branch (3) corresponds to one hydraulic cylinder (10), one end of each of the plurality of oil inlet branches (3) being in communication with the second outflow channel (8), and the other end being in communication with the corresponding reversing valve (2); any of the oil inlet branches (3) being provided with a pressure regulating device for regulating the pressure in the pipeline; An oil return branch (4), the oil return branch (4) comprising a plurality of oil return branches, one oil return branch (4) corresponding to one hydraulic cylinder (10), and any one of the oil return branches (4) being in communication with the corresponding reversing valve (2); A main oil return circuit (5), the main oil return circuit (5) is connected to the oil return branch circuit (4), and the outlet end of the main oil return circuit (5) is connected to the oil tank.

2. The hydraulic circuit system according to claim 1, characterized in that: The pressure regulating device comprises a proportional pressure reducing valve (13) arranged on the oil inlet branch (3), and the proportional pressure reducing valve (13) is used to regulate the pressure of the oil entering the reversing valve (2).

3. The hydraulic circuit system according to claim 2, characterized in that: The proportional pressure reducing valve (13) is provided with an oil discharge port, and the oil discharge port is communicated with the corresponding oil return branch (4).

4. The hydraulic circuit system according to claim 2, characterized in that: The first cylinder branch (11) and the second cylinder branch (12) are both provided with hydraulic locks (15).

5. The hydraulic circuit system according to claim 1, characterized in that: The reversing valve (2) is a two-position four-way solenoid valve.

6. The hydraulic circuit system according to claim 1, characterized in that: The first cylinder branch (11) and / or the second cylinder branch (12) are also connected to a safety valve (16) for adjusting the maximum pressure of the hydraulic cylinder (10).

7. The hydraulic circuit system according to claim 1, characterized in that: A high-pressure filter (18) is provided in the main oil inlet passage (1), and the high-pressure filter (18) is located upstream of the one-way valve (6).

8. The hydraulic circuit system according to claim 7, characterized in that: A first pressure regulating valve (19) is connected between the high-pressure filter (18) and the oil tank.

9. The hydraulic circuit system according to claim 1, characterized in that: An electromagnetic stop valve (20) and a second pressure regulating valve (21) are provided in the pipeline connecting the accumulator (9) and the main oil inlet circuit (1).

10. The hydraulic circuit system according to claim 9, characterized in that: The oil drain port of the accumulator (9) is also connected to a manual stop valve (22).

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