Hydraulic synchronizing loop control system and method

Abstract

The invention relates to the technical field of hydraulic control, in particular to a hydraulic synchronizing loop control system and method.The system comprises a hydraulic pump, an overflow valve, a first three-position four-way electromagnetic reversing valve, a left flow distributing and collecting valve, a right flow distributing and collecting valve, a left reversing valve, a right reversing valve, a first hydraulic oil cylinder, a second hydraulic oil cylinder, a third hydraulic oil cylinder and a fourth hydraulic oil cylinder; the hydraulic pump is connected to the first three-position four-way electromagnetic directional valve, the overflow valve is connected with the hydraulic pump in parallel, the left flow distributing and collecting valve is connected to the first three-position four-way electromagnetic directional valve, and the right flow distributing and collecting valve is connected to the first three-position four-way electromagnetic directional valve; the left flow distributing and collecting valve is connected to the left reversing valve, the first hydraulic oil cylinder, the right reversing valve and the third hydraulic oil cylinder, and the right flow distributing and collecting valve is connected to the fourth hydraulic oil cylinder and the second hydraulic oil cylinder. The hydraulic circuit synchronous control system solves the technical problem that in the prior art, a hydraulic circuit synchronous control system is not high in synchronous precision due to hydraulic cylinder leakage, manufacturing errors and uneven blockage.

Description

Technical Field

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

[0002] There are four main types of existing hydraulic circuit synchronization control systems. The first type uses a synchronization circuit with a flow control valve, achieving synchronized motion by varying the flow rate of a speed control valve. This circuit has a simple structure and can adjust the speed, but adjustment is complex. Furthermore, due to variations in oil temperature and performance differences in the speed control valve, synchronization accuracy is low, typically 5% to 7%. The second type uses a synchronization circuit with tandem hydraulic cylinders. Oil discharged from the return chamber of a hydraulic cylinder is fed into the inlet chamber of the next hydraulic cylinder. If the effective areas of the pistons in the tandem oil chambers are equal, synchronized motion is achieved. However, leakage and manufacturing errors affect the synchronization accuracy of the tandem hydraulic cylinders, leading to severe misalignment after repeated piston reciprocation. The third type of synchronization circuit uses synchronous cylinders or synchronous motors. This circuit achieves synchronization by ensuring that the effective areas of the two chambers of the synchronous cylinder are equal, and the areas of the two working cylinders are also the same. The synchronization accuracy of this circuit depends on the machining accuracy and sealing performance of the hydraulic cylinders, and can generally reach 1% to 2%. Since synchronous cylinders are generally not suitable for large sizes, this circuit is only suitable for small-capacity applications. A synchronization circuit uses two coaxial, equal-displacement, bidirectional hydraulic motors as equal-flow splitters. These motors deliver equal amounts of hydraulic oil to two identically sized hydraulic cylinders, achieving synchronization. This type of synchronization circuit offers higher synchronization accuracy than throttling control, but because the motors used are often plunger motors with high volumetric efficiency, it is more expensive. The fourth method uses servo feedback control to achieve synchronous motion of the hydraulic cylinders. Hydraulic servo systems offer high control accuracy, fast response, and a high degree of automation, but are relatively expensive.

[0003] In summary, there is an urgent need for a hydraulic circuit synchronization control system with high synchronization accuracy and low price to solve the problems existing in the prior art. Summary of the Invention

[0004] The present invention aims to provide a hydraulic synchronization circuit control system and method to solve the technical problem of low synchronization accuracy of the hydraulic control system caused by hydraulic cylinder leakage, manufacturing errors and uneven blockage in the hydraulic circuit synchronization control system in the prior art. The specific technical solution is as follows:

[0005] The present invention provides a hydraulic synchronization circuit control system, comprising: a hydraulic pump, a relief valve, a first three-position four-way solenoid reversing valve, a left diverter and collector valve, a right diverter and collector valve, a left reversing valve, a right reversing valve, a first hydraulic cylinder, a second hydraulic cylinder, a third hydraulic cylinder, and a fourth hydraulic cylinder; the first three-position four-way solenoid reversing valve is provided with an electromagnet 1YA and an electromagnet 2YA;

[0006] The hydraulic pump is connected to the first three-position four-way solenoid reversing valve, the overflow valve is connected in parallel with the hydraulic pump, the left diverter and collector valve is connected to the first three-position four-way solenoid reversing valve, and the right diverter and collector valve is connected to the first three-position four-way solenoid reversing valve;

[0007] The left flow-dividing and collecting valve is connected to the left reversing valve, the first hydraulic cylinder, the right reversing valve and the third hydraulic cylinder, and the right flow-dividing and collecting valve is connected to the fourth hydraulic cylinder and the second hydraulic cylinder.

[0008] A further improvement of the hydraulic synchronization circuit control system of the present invention is that the left reversing valve and the right reversing valve are both three-position four-way electromagnetic reversing valves, the left reversing valve is provided with electromagnet 3YA and electromagnet 4YA, and the right reversing valve is provided with electromagnet 5YA and electromagnet 6YA.

[0009] A further improvement of the hydraulic synchronization circuit control system of the present invention is that it also includes a first stroke switch, a second stroke switch, a third stroke switch and a fourth stroke switch; when the piston of the first hydraulic cylinder moves to the bottom, it is connected to the first stroke switch, when the piston of the second hydraulic cylinder moves to the bottom, it is connected to the second stroke switch, when the piston of the third hydraulic cylinder moves to the bottom, it is connected to the third stroke switch, and when the piston of the fourth hydraulic cylinder moves to the bottom, it is connected to the fourth stroke switch.

[0010] A further improvement of the hydraulic synchronization circuit control system of the present invention is that it also includes a left hydraulically controlled one-way valve and a right hydraulically controlled one-way valve. The left hydraulically controlled one-way valve is arranged on the oil circuit between the left reversing valve and the first hydraulic cylinder, and the left hydraulically controlled one-way valve is also connected to the second hydraulic cylinder. The right hydraulically controlled one-way valve is arranged on the oil circuit between the right reversing valve and the third hydraulic cylinder, and the right hydraulically controlled one-way valve is also connected to the fourth hydraulic cylinder.

[0011] A further improvement of the hydraulic synchronous circuit control system of the present invention is that the A port of the left diverter and collector valve is connected to the P port of the left reversing valve and the rodless chamber of the first hydraulic cylinder; the left hydraulically controlled one-way valve is connected to the rod chamber of the first hydraulic cylinder and the rodless chamber of the second hydraulic cylinder; the B port of the left diverter and collector valve is connected to the P port of the right reversing valve and the rodless chamber of the third hydraulic cylinder; the right hydraulically controlled one-way valve is connected to the rod chamber of the third hydraulic cylinder and the rodless chamber of the fourth hydraulic cylinder; the A port of the right diverter and collector valve is connected to the rod chamber of the fourth hydraulic cylinder, and the B port of the right diverter and collector valve is connected to the rod chamber of the second hydraulic cylinder.

[0012] A further improvement of the hydraulic synchronization circuit control system of the present invention is that it also includes a left two-way overflow valve and a right two-way overflow valve, the left two-way overflow valve is connected between the A port and the B port of the left diverter and collector valve, and the right two-way overflow valve is connected between the A port and the B port of the right diverter and collector valve.

[0013] The present invention also provides a method for using the hydraulic synchronization circuit control system as described above, including: energizing 1YA of the first three-position four-way solenoid reversing valve, and the oil supply of the hydraulic pump flows into the left diversion and collecting valve through the first three-position four-way solenoid reversing valve, and the oil is divided 1:1 after passing through the left diversion and collecting valve, and flows into the rodless chambers of the first hydraulic cylinder and the third hydraulic cylinder respectively, so that the oil in the rod chamber of the first hydraulic cylinder flows into the rodless chamber of the second hydraulic cylinder, and the oil discharged from the rod chamber of the third hydraulic cylinder flows into the rodless chamber of the fourth hydraulic cylinder, and the effective working areas of the first hydraulic cylinder, the second hydraulic cylinder, the third hydraulic cylinder and the fourth hydraulic cylinder are equal, so that the piston rods of the first hydraulic cylinder, the second hydraulic cylinder, the third hydraulic cylinder and the fourth hydraulic cylinder are extended synchronously.

[0014] A further improvement of the hydraulic synchronization circuit control method of the present invention is that it includes: energizing 2YA of the first three-position four-way solenoid reversing valve, and the oil supply of the hydraulic pump flows into the right diversion and collecting valve through the first three-position four-way solenoid reversing valve. The oil is divided 1:1 after passing through the right diversion and collecting valve, and flows into the rod chamber of the fourth hydraulic cylinder and the rod chamber of the second hydraulic cylinder respectively, so that the oil in the rodless chamber of the fourth hydraulic cylinder flows into the rod chamber of the third hydraulic cylinder, and the oil discharged from the rodless chamber of the second hydraulic cylinder flows into the rod chamber of the first hydraulic cylinder, and the effective working areas of the first hydraulic cylinder, the second hydraulic cylinder, the third hydraulic cylinder and the fourth hydraulic cylinder are equal, so that the piston rods of the first hydraulic cylinder, the second hydraulic cylinder, the third hydraulic cylinder and the fourth hydraulic cylinder can be retracted synchronously.

[0015] A further improvement of the hydraulic synchronization circuit control method of the present invention comprises: when the piston of the first hydraulic cylinder first moves to the bottom, triggering the first travel switch to energize the electromagnet 3YA of the left reversing valve, the pressurized oil passes through the left reversing valve and the left hydraulically controlled one-way valve to replenish the rodless chamber of the second hydraulic cylinder, causing the piston of the second hydraulic cylinder to continue to move to the bottom;

[0016] When the piston of the second hydraulic cylinder moves to the bottom first, touching the second stroke switch to energize the electromagnet 4YA of the left reversing valve, the pressure oil passes through the left reversing valve and enters the control oil port of the left hydraulic control check valve. The left hydraulic control check valve is then reversed, allowing the rod chamber of the first hydraulic cylinder to return oil through the left hydraulic control check valve and the left reversing valve, so that the piston of the first hydraulic cylinder continues to move to the bottom, thereby compensating for the imbalance.

[0017] A further improvement of the hydraulic synchronization circuit control method of the present invention comprises: when the piston of the third hydraulic cylinder first moves to the bottom, the third travel switch is triggered to energize the electromagnet 5YA of the right reversing valve, and the pressurized oil passes through the right reversing valve and the right hydraulically controlled one-way valve to replenish the rodless chamber of the fourth hydraulic cylinder, so that the piston of the fourth hydraulic cylinder continues to move to the bottom;

[0018] When the piston of the fourth hydraulic cylinder moves to the bottom first, it touches the fourth stroke switch to energize the electromagnet 6YA of the right reversing valve. At this time, the pressure oil passes through the right reversing valve and enters the control oil port of the right hydraulic control check valve. The right hydraulic control check valve is then reversed, allowing the rod chamber of the third hydraulic cylinder to return oil through the right hydraulic control check valve and the right reversing valve, so that the piston of the third hydraulic cylinder continues to move to the bottom, thereby compensating for the imbalance.

[0019] The application of the technical solution of the present invention has the following beneficial effects:

[0020] The hydraulic synchronization circuit control system of the present invention improves the accuracy of the synchronization process through the diversion of the left diverter and right diverter valves and the synchronization circuit of the hydraulic cylinder in series. The two-way overflow valve has a calibration effect on the diversion error, thereby improving the accuracy of oil distribution during the synchronous operation of the cylinders. This solves the technical problem of low synchronization accuracy of the hydraulic control system caused by hydraulic cylinder leakage, manufacturing errors and uneven blockage in the hydraulic circuit synchronization control system in the prior art. The hydraulic cylinder compensation circuit arranged in series in the present invention eliminates the influence of leakage and manufacturing errors and improves synchronization accuracy. When the present invention is applied to the high-pressure expansion joint, the hydraulic cylinder can also withstand external loads to achieve synchronous movement when the hydraulic system is not powered, thereby realizing passive adjustment of the high-pressure expansion joint.

[0021] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 It is a structural diagram of the hydraulic synchronization circuit control system of the present invention.

[0024] Among them, 1. Hydraulic pump; 2. Overflow valve; 3. First three-position four-way solenoid reversing valve; 4. Left diverter and collector valve; 5. Right diverter and collector valve; 6. Left two-way overflow valve; 7. Right two-way overflow valve; 8. Left reversing valve 9. Right reversing valve; 10. Left hydraulic-controlled one-way valve; 11. Right hydraulic-controlled one-way valve; 12. First hydraulic cylinder; 13. Second hydraulic cylinder; 14. Third hydraulic cylinder; 15. Fourth hydraulic cylinder; 1S, First travel switch; 2S, Second travel switch; 3S, Third travel switch; 4S, Fourth travel switch. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0026] High-pressure expansion joints are used to connect high-pressure pipelines. They compensate for pipeline length adjustments required for installation and adjustment, compensate for deformation along the pipeline's length due to thermal expansion and contraction, and maintain a tight seal. High-pressure expansion joints are driven and controlled by the expansion and contraction of four hydraulic cylinders. Therefore, operation requires synchronization of the cylinders. Due to issues such as cylinder leakage, manufacturing errors, and uneven blockage, existing hydraulic control systems suffer from low synchronization accuracy and unsatisfactory synchronization. Therefore, the present invention provides a hydraulic synchronization circuit control system to address this technical problem.

[0027] See also Figure 1 As shown, a hydraulic synchronization circuit control system includes: a hydraulic pump 1, a relief valve 2, a first three-position four-way solenoid reversing valve 3, a left diverter and collector valve 4, a right diverter and collector valve 5, a left reversing valve 8, a right reversing valve 9, a first hydraulic cylinder 12, a second hydraulic cylinder 13, a third hydraulic cylinder 14 and a fourth hydraulic cylinder 15; the first three-position four-way solenoid reversing valve 3 is provided with an electromagnet 1YA and an electromagnet 2YA; the hydraulic pump 1 is connected to the first three-position four-way solenoid reversing valve 3, the relief valve 2 is connected in parallel with the hydraulic pump 1, the left diverter and collector valve 4 is connected to the first three-position four-way solenoid reversing valve 3, and the right diverter and collector valve 5 is connected to the first three-position four-way solenoid reversing valve 3; the left diverter and collector valve 4 is connected to the left reversing valve 8, the first hydraulic cylinder 12, the right reversing valve 9 and the third hydraulic cylinder 14, and the right diverter and collector valve 5 is connected to the fourth hydraulic cylinder 15 and the second hydraulic cylinder 13.

[0028] Specifically, the hydraulic pump 1 is connected to the oil tank. By connecting the relief valve 2 in parallel with the hydraulic pump 1, a pressure regulating and overflow function is achieved. Part of the pumped oil enters the main oil circuit for operation, while the excess oil must flow back to the oil tank through the relief valve 2. The hydraulic cylinder can achieve active and passive adjustment according to actual working needs.

[0029] Preferably, the left reversing valve 8 and the right reversing valve 9 are both three-position four-way solenoid reversing valves. The left reversing valve 8 is provided with an electromagnet 3YA and an electromagnet 4YA, and the right reversing valve 9 is provided with an electromagnet 5YA and an electromagnet 6YA. The three-position four-way solenoid reversing valve has three interfaces: the oil inlet P port, the first working oil port A port, and the second working oil port B port for oil outlet, and also has two electromagnets. The left diverter and collector valve 4 and the right diverter and collector valve 5 respectively have three interfaces: the oil inlet P port, the first working oil port A port, and the second working oil port B port for oil outlet. The first working oil port A port of the first three-position four-way solenoid reversing valve 3 is connected to the P port of the left diverter and collector valve 4, and the second working oil port B port of the first three-position four-way solenoid reversing valve 3 is connected to the P port of the right diverter and collector valve 5.

[0030] Preferably, it also includes a first travel switch 1S, a second travel switch 2S, a third travel switch 3S and a fourth travel switch 4S; when the piston of the first hydraulic cylinder 12 moves to the bottom, it is connected to the first travel switch 1S, when the piston of the second hydraulic cylinder 13 moves to the bottom, it is connected to the second travel switch 2S, when the piston of the third hydraulic cylinder 14 moves to the bottom, it is connected to the third travel switch 3S, and when the piston of the fourth hydraulic cylinder 15 moves to the bottom, it is connected to the fourth travel switch 4S.

[0031] Preferably, it also includes a left hydraulically controlled one-way valve 10 and a right hydraulically controlled one-way valve 11. The left hydraulically controlled one-way valve 10 is arranged on the oil circuit between the left reversing valve 8 and the first hydraulic cylinder 12, and the left hydraulically controlled one-way valve 10 is also connected to the second hydraulic cylinder 13. The right hydraulically controlled one-way valve 11 is arranged on the oil circuit between the right reversing valve 9 and the third hydraulic cylinder 14, and the right hydraulically controlled one-way valve 11 is also connected to the fourth hydraulic cylinder 15.

[0032] Preferably, the A port of the left diverter and collector valve 4 is connected to the P port of the left reversing valve 8 and the rodless chamber of the first hydraulic cylinder 12; the left hydraulically controlled one-way valve 10 is connected to the rod chamber of the first hydraulic cylinder 12 and the rodless chamber of the second hydraulic cylinder 13; the B port of the left diverter and collector valve 4 is connected to the P port of the right reversing valve 9 and the rodless chamber of the third hydraulic cylinder 14; the right hydraulically controlled one-way valve 11 is connected to the rod chamber of the third hydraulic cylinder 14 and the rodless chamber of the fourth hydraulic cylinder 15; the A port of the right diverter and collector valve 5 is connected to the rod chamber of the fourth hydraulic cylinder 15, and the B port of the right diverter and collector valve 5 is connected to the rod chamber of the second hydraulic cylinder 13.

[0033] Preferably, the system further includes a left two-way relief valve 6 and a right two-way relief valve 7. The left two-way relief valve 6 is connected between ports A and B of the left diverter and collector valve 4, and the right two-way relief valve 7 is connected between ports A and B of the right diverter and collector valve 5. The left two-way relief valve 6 and the right two-way relief valve 7 calibrate the diversion error between the left diverter and collector valves 4 and 5, thereby improving the accuracy of oil distribution during synchronous operation of the cylinders.

[0034] The present invention also provides a method for using the hydraulic synchronization circuit control system as described above, including: energizing 1YA of the first three-position four-way solenoid reversing valve 3, and the oil supply of the hydraulic pump 1 flows into the left diversion and collecting valve 4 through the first three-position four-way solenoid reversing valve 3. The oil is divided 1:1 after passing through the left diversion and collecting valve 4, and flows into the rodless chambers of the first hydraulic cylinder 12 and the third hydraulic cylinder 14 respectively, so that the oil in the rod chamber of the first hydraulic cylinder 12 flows into the rodless chamber of the second hydraulic cylinder 13, and the oil discharged from the rod chamber of the third hydraulic cylinder 14 flows into the rodless chamber of the fourth hydraulic cylinder 15, and the effective working areas of the first hydraulic cylinder 12, the second hydraulic cylinder 13, the third hydraulic cylinder 14 and the fourth hydraulic cylinder 15 are equal, so that the piston rods of the first hydraulic cylinder 12, the second hydraulic cylinder 13, the third hydraulic cylinder 14 and the fourth hydraulic cylinder 15 are extended synchronously. When the piston rods of the second hydraulic cylinder 13 and the fourth hydraulic cylinder 15 are extended, the hydraulic oil discharged from the rod chambers of the second hydraulic cylinder 13 and the fourth hydraulic cylinder 15 flows through the right diverter and collector valve 5 and the first three-position four-way solenoid reversing valve 3 and returns to the oil tank.

[0035] Preferably, 2YA of the first three-position four-way solenoid reversing valve 3 is energized, and the oil supply of the hydraulic pump 1 flows into the right diversion and collecting valve 5 through the first three-position four-way solenoid reversing valve 3. The oil is diverted 1:1 after passing through the right diversion and collecting valve 5, and flows into the rod chamber of the fourth hydraulic cylinder 15 and the rod chamber of the second hydraulic cylinder 13 respectively, so that the oil in the rodless chamber of the fourth hydraulic cylinder 15 flows into the rod chamber of the third hydraulic cylinder 14, and the oil discharged from the rodless chamber of the second hydraulic cylinder 13 flows into the rod chamber of the first hydraulic cylinder 12, and the effective working areas of the first hydraulic cylinder 12, the second hydraulic cylinder 13, the third hydraulic cylinder 14 and the fourth hydraulic cylinder 15 are equal, so that the piston rods of the first hydraulic cylinder 12, the second hydraulic cylinder 13, the third hydraulic cylinder 14 and the fourth hydraulic cylinder 15 can be retracted and move synchronously. When the piston rods of the first hydraulic cylinder 12 and the third hydraulic cylinder 14 contract, the hydraulic oil discharged from the rodless chambers of the third hydraulic cylinder 14 and the first hydraulic cylinder 12 flows through the left diverter and collector valve 4 and the first three-position four-way solenoid reversing valve 3 and returns to the oil tank.

[0036] When the first three-position four-way solenoid directional valve 3 is not energized, the P port of the left diverter and collector valve 4 is connected to the P port of the right diverter and collector valve 5. At this time, all hydraulic cylinders can be synchronously extended and retracted under external load.

[0037] Leakage and manufacturing errors can affect the synchronization accuracy of the hydraulic cylinder. When the piston reciprocates multiple times, serious imbalance will occur. Therefore, the present invention also provides a compensation circuit. The operating principle of the compensation circuit is as follows:

[0038] When the piston of the first hydraulic cylinder 12 moves to the bottom first, it triggers the first travel switch 1S, which energizes the electromagnet 3YA of the left reversing valve 8. The pressurized oil then flows through the left reversing valve 8 and the left hydraulically controlled one-way valve 10 to replenish the rodless chamber of the second hydraulic cylinder 13, causing the piston of the second hydraulic cylinder 13 to continue to move to the bottom.

[0039] When the piston of the second hydraulic cylinder 13 moves to the bottom first, touching the second travel switch 2S to energize the electromagnet 4YA of the left reversing valve 8, the pressure oil enters the control oil port of the left hydraulic control check valve 10 through the left reversing valve 8, and the left hydraulic control check valve 10 is reversed, so that the rod chamber of the first hydraulic cylinder 12 can return oil through the left hydraulic control check valve 10 and the left reversing valve 8, so that the piston of the first hydraulic cylinder 12 continues to move to the bottom, thereby compensating for the imbalance.

[0040] When the piston of the third hydraulic cylinder 14 moves to the bottom first, the third travel switch 3S is triggered, which energizes the electromagnet 5YA of the right reversing valve 9. The pressurized oil then flows through the right reversing valve 9 and the right hydraulically controlled one-way valve 11 to replenish the rodless chamber of the fourth hydraulic cylinder 15, causing the piston of the fourth hydraulic cylinder 15 to continue to move to the bottom.

[0041] When the piston of the fourth hydraulic cylinder 15 moves to the bottom first, it touches the fourth stroke switch 4S to energize the electromagnet 6YA of the right reversing valve 9. At this time, the pressure oil passes through the right reversing valve 9 and enters the control oil port of the right hydraulic control check valve 11. The right hydraulic control check valve 11 is then reversed, so that the rod chamber of the third hydraulic cylinder 14 can return oil through the right hydraulic control check valve 11 and the right reversing valve 9, so that the piston of the third hydraulic cylinder 14 continues to move to the bottom, thereby compensating for the imbalance.

[0042] The present invention is used for hydraulic control of a high-pressure expansion joint. When the first three-position, four-way solenoid reversing valve (3) is energized, the high-pressure expansion joint is actively adjusted to compensate for pipeline length adjustments due to installation. When the first three-position, four-way solenoid reversing valve (3) is de-energized, the high-pressure expansion joint is passively adjusted to compensate for pipeline deformation due to thermal expansion and contraction, while maintaining a tight seal. A compensation circuit is also provided to compensate for hydraulic cylinder misalignment caused by leakage and manufacturing errors.

[0043] The hydraulic synchronization circuit control system of the present invention improves the accuracy of the synchronization process through the diversion of the left diverter and collector valve 4 and the right diverter and collector valve 5 and the synchronization circuit in series with the hydraulic cylinder. The two-way overflow valve has a calibration effect on the diversion error, thereby improving the accuracy of oil distribution during the synchronous operation of the cylinder, and solves the technical problem of low synchronization accuracy of the hydraulic control system caused by hydraulic cylinder leakage, manufacturing errors and uneven blockage in the hydraulic circuit synchronization control system in the prior art. The hydraulic cylinder compensation circuit arranged in series in the present invention eliminates the influence of leakage and manufacturing errors and improves synchronization accuracy. When the present invention is applied to the high-pressure expansion joint, the hydraulic cylinder can also withstand external loads to achieve synchronous movement when the hydraulic system is not powered, thereby realizing passive adjustment of the high-pressure expansion joint.

[0044] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A hydraulic synchronous circuit control system, characterized in that: include: A hydraulic pump (1), a relief valve (2), a first three-position four-way electromagnetic reversing valve (3), a left diverter and collector valve (4), a right diverter and collector valve (5), a left reversing valve (8), a right reversing valve (9), a first hydraulic oil cylinder (12), a second hydraulic oil cylinder (13), a third hydraulic oil cylinder (14) and a fourth hydraulic oil cylinder (15); the first three-position four-way electromagnetic reversing valve (3) is provided with an electromagnet 1YA and an electromagnet 2YA; The hydraulic pump (1) is connected to the first three-position four-way electromagnetic reversing valve (3), the overflow valve (2) is connected in parallel with the hydraulic pump (1), the left flow dividing and collecting valve (4) is connected to the first three-position four-way electromagnetic reversing valve (3), and the right flow dividing and collecting valve (5) is connected to the first three-position four-way electromagnetic reversing valve (3); The left flow-dividing and collecting valve (4) is connected to the left reversing valve (8), the first hydraulic cylinder (12), the right reversing valve (9) and the third hydraulic cylinder (14), and the right flow-dividing and collecting valve (5) is connected to the fourth hydraulic cylinder (15) and the second hydraulic cylinder (13).

2. The hydraulic synchronization circuit control system according to claim 1, characterized in that: The left reversing valve (8) and the right reversing valve (9) are both three-position four-way electromagnetic reversing valves. The left reversing valve (8) is provided with an electromagnet 3YA and an electromagnet 4YA, and the right reversing valve (9) is provided with an electromagnet 5YA and an electromagnet 6YA.

3. The hydraulic synchronization circuit control system according to claim 2, characterized in that: The invention also includes a first travel switch (1S), a second travel switch (2S), a third travel switch (3S) and a fourth travel switch (4S); when the piston of the first hydraulic oil cylinder (12) moves to the bottom, it is connected to the first travel switch (1S); when the piston of the second hydraulic oil cylinder (13) moves to the bottom, it is connected to the second travel switch (2S); when the piston of the third hydraulic oil cylinder (14) moves to the bottom, it is connected to the third travel switch (3S); and when the piston of the fourth hydraulic oil cylinder (15) moves to the bottom, it is connected to the fourth travel switch (4S).

4. The hydraulic synchronization circuit control system according to claim 2, characterized in that: The invention also includes a left hydraulically controlled one-way valve (10) and a right hydraulically controlled one-way valve (11), wherein the left hydraulically controlled one-way valve (10) is arranged on the oil circuit between the left reversing valve (8) and the first hydraulic oil cylinder (12), and the left hydraulically controlled one-way valve (10) is also connected to the second hydraulic oil cylinder (13), and the right hydraulically controlled one-way valve (11) is arranged on the oil circuit between the right reversing valve (9) and the third hydraulic oil cylinder (14), and the right hydraulically controlled one-way valve (11) is also connected to the fourth hydraulic oil cylinder (15).

5. The hydraulic synchronization circuit control system according to claim 4, characterized in that: The A port of the left diverter and collector valve (4) is connected to the P port of the left reversing valve (8) and the rodless chamber of the first hydraulic cylinder (12); the left hydraulically controlled one-way valve (10) is connected to the rod chamber of the first hydraulic cylinder (12) and the rodless chamber of the second hydraulic cylinder (13); the B port of the left diverter and collector valve (4) is connected to the P port of the right reversing valve (9) and the rodless chamber of the third hydraulic cylinder (14); the right hydraulically controlled one-way valve (11) is connected to the rod chamber of the third hydraulic cylinder (14) and the rodless chamber of the fourth hydraulic cylinder (15); the A port of the right diverter and collector valve (5) is connected to the rod chamber of the fourth hydraulic cylinder (15), and the B port of the right diverter and collector valve (5) is connected to the rod chamber of the second hydraulic cylinder (13).

6. The hydraulic synchronization circuit control system according to claim 1, characterized in that: It also includes a left two-way overflow valve (6) and a right two-way overflow valve (7), wherein the left two-way overflow valve (6) is connected between the A port and the B port of the left flow dividing and collecting valve (4), and the right two-way overflow valve (7) is connected between the A port and the B port of the right flow dividing and collecting valve (5).

7. A method using the hydraulic synchronization circuit control system according to claim 5, characterized in that: include: The 1YA of the first three-position four-way electromagnetic reversing valve (3) is energized, and the oil supply of the hydraulic pump (1) flows into the left diversion and collection valve (4) through the first three-position four-way electromagnetic reversing valve (3). The oil is divided into 1:1 after passing through the left diversion and collection valve (4) and flows into the rodless chambers of the first hydraulic oil cylinder (12) and the third hydraulic oil cylinder (14) respectively, so that the oil in the rod chamber of the first hydraulic oil cylinder (12) flows into the rodless chamber of the second hydraulic oil cylinder (13), and the oil discharged from the rod chamber of the third hydraulic oil cylinder (14) flows into the rodless chamber of the fourth hydraulic oil cylinder (15). The effective action areas of the first hydraulic oil cylinder (12), the second hydraulic oil cylinder (13), the third hydraulic oil cylinder (14) and the fourth hydraulic oil cylinder (15) are equal, so that the piston rods of the first hydraulic oil cylinder (12), the second hydraulic oil cylinder (13), the third hydraulic oil cylinder (14) and the fourth hydraulic oil cylinder (15) extend synchronously.

8. The hydraulic synchronization circuit control method according to claim 7, characterized in that: include: The 2YA of the first three-position four-way electromagnetic reversing valve (3) is energized, and the oil supply of the hydraulic pump (1) flows into the right diversion and collection valve (5) through the first three-position four-way electromagnetic reversing valve (3). The oil is divided into 1:1 after passing through the right diversion and collection valve (5), and flows into the rod chamber of the fourth hydraulic oil cylinder (15) and the rod chamber of the second hydraulic oil cylinder (13) respectively, so that the oil in the rodless chamber of the fourth hydraulic oil cylinder (15) flows into the rod chamber of the third hydraulic oil cylinder (14), and the oil discharged from the rodless chamber of the second hydraulic oil cylinder (13) flows into the rod chamber of the first hydraulic oil cylinder (12). The effective action areas of the first hydraulic oil cylinder (12), the second hydraulic oil cylinder (13), the third hydraulic oil cylinder (14) and the fourth hydraulic oil cylinder (15) are equal, so that the piston rods of the first hydraulic oil cylinder (12), the second hydraulic oil cylinder (13), the third hydraulic oil cylinder (14) and the fourth hydraulic oil cylinder (15) can be retracted and moved synchronously.

9. The hydraulic synchronization circuit control method according to claim 7, characterized in that: include: When the piston of the first hydraulic oil cylinder (12) moves to the bottom first, the first travel switch (1S) is triggered to energize the electromagnet 3YA of the left reversing valve (8), and the pressure oil passes through the left reversing valve (8) and the left hydraulic control check valve (10) to replenish the rodless chamber of the second hydraulic oil cylinder (13), so that the piston of the second hydraulic oil cylinder (13) continues to move to the bottom; When the piston of the second hydraulic oil cylinder (13) moves to the bottom first, the second travel switch (2S) is touched to energize the electromagnet 4YA of the left reversing valve (8), and the pressure oil enters the control oil port of the left hydraulic control check valve (10) through the left reversing valve (8). Then, the left hydraulic control check valve (10) is reversely conducted, so that the rod chamber of the first hydraulic oil cylinder (12) can return oil through the left hydraulic control check valve (10) and the left reversing valve (8), so that the piston of the first hydraulic oil cylinder (12) continues to move to the bottom, thereby compensating for the imbalance phenomenon.

10. The hydraulic synchronization circuit control method according to claim 7, characterized in that: include: When the piston of the third hydraulic oil cylinder (14) moves to the bottom first, the third travel switch (3S) is triggered to energize the electromagnet 5YA of the right reversing valve (9), and the pressure oil flows through the right reversing valve (9) and the right hydraulic control check valve (11) to replenish the rodless chamber of the fourth hydraulic oil cylinder (15), so that the piston of the fourth hydraulic oil cylinder (15) continues to move to the bottom. When the piston of the fourth hydraulic oil cylinder (15) moves to the bottom first, the fourth stroke switch (4S) is touched to energize the electromagnet 6YA of the right reversing valve (9), and the pressure oil then passes through the right reversing valve (9) and enters the control oil port of the right hydraulic control check valve (11). Then the right hydraulic control check valve (11) is reversely conducted, so that the rod chamber of the third hydraulic oil cylinder (14) can return oil through the right hydraulic control check valve (11) and the right reversing valve (9), so that the piston of the third hydraulic oil cylinder (14) continues to move to the bottom, thereby compensating for the imbalance phenomenon.

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