A double-cylinder linkage sequential control hydraulic system

Abstract

The utility model relates to technical field of hydraulic control especially, it is a kind of double-cylinder linkage sequence control hydraulic system, it utilizes the characteristics of sequence valve itself, the on-off of oil outlet is controlled by oil inlet pressure, set opening pressure, high reliability, can discover and handle fault in time, applicable to a variety of work scenes;Including first hydraulic cylinder and second hydraulic cylinder, first hydraulic cylinder and second hydraulic cylinder are all installed on fixed surface;It further includes first sequence valve, second sequence valve, three-position four-way electromagnetic reversing valve, first electromagnet, second electromagnet and oil pump, the P port of three-position four-way electromagnetic reversing valve is communicated with oil pump, the T port of three-position four-way electromagnetic reversing valve is communicated with oil tank, the A port and B port of three-position four-way electromagnetic reversing valve are connected to the A port of first sequence valve, second sequence valve and the rod cavity and rod cavity of first hydraulic cylinder respectively, the B port of first sequence valve, second sequence valve is connected to the rod cavity and rod cavity of second hydraulic cylinder respectively.

Description

Technical Field

[0001] This utility model relates to the technical field of hydraulic control, and in particular to a dual-cylinder linkage sequential control hydraulic system. Background Technology

[0002] In many industrial production processes, such as machinery manufacturing, metallurgy, and chemical engineering, two or more actuators often need to operate in a specific sequence to complete the task.

[0003] Although existing mechanical linkage systems have simple structures, they are easily affected by factors such as mechanical wear and uneven load, which can lead to decreased control accuracy or even mechanical damage. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a dual-cylinder linkage sequential control hydraulic system that utilizes the characteristics of the sequence valve itself, controls the opening and closing of the oil outlet by the oil inlet pressure, sets the opening pressure, has high reliability, can detect and handle faults in a timely manner, improves the reliability and stability of the system, has strong adaptability, and is suitable for various working scenarios.

[0005] This utility model discloses a dual-cylinder linkage sequential control hydraulic system, comprising a first hydraulic cylinder and a second hydraulic cylinder, both mounted on a fixed surface; it also includes a first sequence valve, a second sequence valve, a three-position four-way solenoid directional valve, a first electromagnet, a second electromagnet, and an oil pump. The P port of the three-position four-way solenoid directional valve is connected to the oil pump, and the T port is connected to the oil tank. The A and B ports of the three-position four-way solenoid directional valve are respectively connected to the A ports of the first and second sequence valves and the rod-side and rodless-side chambers of the first hydraulic cylinder; the B ports of the first and second sequence valves are respectively connected to the rod-side and rodless-side chambers of the second hydraulic cylinder. When the second solenoid of the directional valve is energized, the oil enters the B port of the three-position four-way solenoid directional valve through the P port. The oil in the B port of the three-position four-way solenoid directional valve reaches the rodless chamber of the first hydraulic cylinder, pushing the first hydraulic cylinder to extend. At this time, because the pressure of the oil in the B port of the three-position four-way solenoid directional valve has not reached the opening pressure of the second sequence valve, no oil will reach the rodless chamber of the second hydraulic cylinder, so the second hydraulic cylinder will not move. After the first hydraulic cylinder extends to the position, the system continues to pressurize, and the pressure rises. When the pressure reaches the pressure set by the second sequence valve, the second sequence valve opens, and the oil enters the rodless chamber of the second hydraulic cylinder, pushing the second hydraulic cylinder to extend until it extends to the position. Thus, the sequential extension action of the hydraulic cylinders is completed.

[0006] When the second hydraulic cylinder extends to its position, the three-position four-way solenoid valve switches to energize the first electromagnet.

[0007] When the first solenoid of the three-position four-way solenoid directional valve is energized, oil flows from port P to port A. The oil at port A of the three-position four-way solenoid directional valve reaches the rod chamber of the first hydraulic cylinder, pushing the first hydraulic cylinder to retract. At this time, because the pressure of the oil at port A of the three-position four-way solenoid directional valve has not reached the opening pressure of the first sequence valve, no oil will reach the rod chamber of the second hydraulic cylinder, so the second hydraulic cylinder will not move. After the first hydraulic cylinder retracts to its position, the system continues to pressurize, and the pressure increases. When the pressure reaches the pressure set by the first sequence valve, the first sequence valve opens, and oil enters the rod chamber of the second hydraulic cylinder, pushing the second hydraulic cylinder to retract until it returns to its original position. Thus, the sequential retraction of the hydraulic cylinders is completed. After the second hydraulic cylinder returns to its original position, the three-position four-way solenoid directional valve returns to the neutral position.

[0008] Preferably, it also includes a safety valve, with its P port connected to the oil pump and its T port connected to the oil tank. After the oil pump supplies oil to the system, due to the neutral position function of the three-position four-way solenoid valve, the oil flows directly back to the oil tank, and the system has no pressure. When the first or second electromagnet on the three-position four-way solenoid valve is energized, the system pressure can be set by adjusting the safety valve.

[0009] Preferably, it also includes a limit switch, which is set on the moving end of the second hydraulic cylinder; when the second hydraulic cylinder extends to the position and hits the limit switch, the three-position four-way solenoid valve switches to the first solenoid being energized; when the second hydraulic cylinder returns to the original position and hits the limit switch, the three-position four-way solenoid valve returns to the neutral position.

[0010] Preferably, it also includes a filter screen, which is connected and installed at the oil tank inlet; the filter screen filters the circulating oil, reduces debris contamination caused by wear of mechanical equipment in the system, and improves the reliability and stability of system operation.

[0011] Preferably, the oil tank is equipped with an electric heater and a temperature sensor; the temperature sensor monitors the temperature of the oil, and when the oil temperature is low, the electric heater heats the oil to improve the flowability of the oil.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: by utilizing the characteristics of the sequence valve itself, the inlet pressure controls the opening and closing of the outlet, and by setting the opening pressure, the second hydraulic cylinder starts to move after the first hydraulic cylinder reaches a certain working pressure. It has high reliability, can detect and handle faults in a timely manner, improves the reliability and stability of the system, and has strong adaptability. This hydraulic system can adjust the pressure and flow according to different working conditions, and is suitable for a variety of working scenarios. The system can operate stably under different loads and different action speed requirements. Attached Figure Description

[0013] Figure 1This is a schematic diagram of the isometric structure of this utility model;

[0014] Figure 2 This is a partial structural diagram showing the connection between the three-position four-way solenoid directional valve and the first electromagnet, etc.

[0015] Figure 3 This is a partial structural diagram showing the connection between the first sequence valve and the second hydraulic cylinder, etc.

[0016] The following are labels in the attached diagram: 1. First sequence valve; 2. Second sequence valve; 3. Three-position four-way solenoid directional valve; 4. Safety valve; 5. First hydraulic cylinder; 6. Second hydraulic cylinder; 7. Limit switch; 8. First electromagnet; 9. Second electromagnet; 10. Oil pump. Detailed Implementation

[0017] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete.

[0018] Example 1

[0019] like Figures 1 to 3 As shown, this utility model discloses a dual-cylinder linkage sequential control hydraulic system, including a first hydraulic cylinder 5 and a second hydraulic cylinder 6, both of which are mounted on a fixed surface; it also includes a first sequence valve 1, a second sequence valve 2, a three-position four-way solenoid directional valve 3, a first electromagnet 8, a second electromagnet 9, and an oil pump 10. The P port of the three-position four-way solenoid directional valve 3 is connected to the oil pump 10, and the T port of the three-position four-way solenoid directional valve 3 is connected to the oil tank. The A port and B port of the three-position four-way solenoid directional valve 3 are respectively connected to the A port of the first sequence valve 1 and the second sequence valve 2 and the rod chamber and rodless chamber of the first hydraulic cylinder 5, respectively. The B port of the first sequence valve 1 and the second sequence valve 2 are respectively connected to the rod chamber and rodless chamber of the second hydraulic cylinder 6.

[0020] like Figure 2 As shown, it also includes a safety valve 4, the P port of which is connected to the oil pump 10, and the T port of which is connected to the oil tank.

[0021] In this embodiment, when the second electromagnet 9 of the three-position four-way solenoid directional valve 3 is energized, oil enters the B port through the P port of the three-position four-way solenoid directional valve 3. The oil at the B port of the three-position four-way solenoid directional valve 3 reaches the rodless chamber of the first hydraulic cylinder 5, pushing the first hydraulic cylinder 5 to extend. At this time, since the pressure of the oil at the B port of the three-position four-way solenoid directional valve 3 has not reached the opening pressure of the second sequence valve 2, no oil will reach the rodless chamber of the second hydraulic cylinder 6, so the second hydraulic cylinder 6 will not move. After the first hydraulic cylinder 5 extends to the end, the system continues to pressurize, and the pressure increases. When the pressure reaches the pressure set by the second sequence valve 2, the second sequence valve 2 opens, and oil enters the rodless chamber of the second hydraulic cylinder 6, pushing the second hydraulic cylinder 6 to extend until it extends to the end, thus completing the action of sequential extension of the hydraulic cylinders.

[0022] When the second hydraulic cylinder 6 extends to its position, the three-position four-way solenoid valve 3 switches to the first electromagnet 8 being energized.

[0023] When the first electromagnet 8 of the three-position four-way solenoid directional valve 3 is energized, oil enters port A through port P of the three-position four-way solenoid directional valve 3. The oil in port A of the three-position four-way solenoid directional valve 3 pushes the first hydraulic cylinder 5 to retract. At this time, because the pressure of the oil in port A of the three-position four-way solenoid directional valve 3 has not reached the opening pressure of the first sequence valve 1, no oil will enter the rod chamber of the second hydraulic cylinder 6, so the second hydraulic cylinder 6 will not move. After the first hydraulic cylinder 5 retracts to its position, the system continues to pressurize, and the pressure increases. When the pressure reaches the pressure set by the first sequence valve 1, the first sequence valve 1 opens, and oil enters the rod chamber of the second hydraulic cylinder 6, pushing the second hydraulic cylinder 6 to retract until it returns to its original position. Thus, the sequential retraction of the hydraulic cylinders is completed. After the second hydraulic cylinder 6 retracts to its original position, the three-position four-way solenoid directional valve 3 returns to the neutral position.

[0024] Example 2

[0025] Based on Example 1, such as Figure 1 As shown, the present invention provides a dual-cylinder linkage sequential control hydraulic system, which also includes a limit switch 7, which is disposed on the moving end of the second hydraulic cylinder 6.

[0026] like Figure 1 As shown, it also includes a filter screen, which is connected and installed at the oil tank inlet.

[0027] like Figure 1 As shown, the oil tank is equipped with an electric heater and a temperature sensor;

[0028] In this embodiment, after the oil pump 10 supplies oil to the system, due to the neutral position function of the three-position four-way solenoid directional valve 3, the oil flows directly back to the oil tank, and the system has no pressure. When the first electromagnet 8 or the second electromagnet 9 on the three-position four-way solenoid directional valve 3 is energized, the system pressure can be set by adjusting the safety valve 4. When the second hydraulic cylinder 6 extends to the position and hits the limit switch 7, the three-position four-way solenoid directional valve 3 switches to the first electromagnet 8 being energized. When the second hydraulic cylinder 6 returns to its original position and hits the limit switch 7, the three-position four-way solenoid directional valve 3 returns to the neutral position.

[0029] This utility model discloses a dual-cylinder linkage sequential control hydraulic system. During operation, when the second electromagnet 9 of the three-position four-way solenoid directional valve 3 is energized, hydraulic fluid enters the B port through the P port of the three-position four-way solenoid directional valve 3. The hydraulic fluid at the B port of the three-position four-way solenoid directional valve 3 reaches the rodless chamber of the first hydraulic cylinder 5, pushing the first hydraulic cylinder 5 to extend. At this time, because the pressure of the hydraulic fluid at the B port of the three-position four-way solenoid directional valve 3 does not reach the opening pressure of the second sequence valve 2, no hydraulic fluid reaches the rodless chamber of the second hydraulic cylinder 6, so the second hydraulic cylinder 6 will not move. After the first hydraulic cylinder 5 extends to its full position, the system continuously pressurizes, and the pressure increases. When the pressure reaches the pressure set by the second sequence valve 2, the second sequence valve 2 opens, and hydraulic fluid enters the rodless chamber of the second hydraulic cylinder 6, pushing the second hydraulic cylinder 6 to extend until it reaches its full position, thus completing the sequential extension action of the hydraulic cylinders.

[0030] When the second hydraulic cylinder 6 extends to its position, the three-position four-way solenoid valve 3 switches to energize the first solenoid 8. When the first solenoid 8 of the three-position four-way solenoid valve 3 is energized, oil enters port A through port P of the three-position four-way solenoid valve 3. The oil in port A of the three-position four-way solenoid valve 3 pushes the first hydraulic cylinder 5 to retract. At this time, since the pressure of the oil in port A of the three-position four-way solenoid valve 3 has not reached the opening pressure of the first sequence valve 1, no oil will enter the rod chamber of the second hydraulic cylinder 6, so the second hydraulic cylinder 6 will not move. After the first hydraulic cylinder 5 retracts to its position, the system continues to pressurize, and the pressure increases. When the pressure reaches the pressure set by the first sequence valve 1, the first sequence valve 1 opens, and oil enters the rod chamber of the second hydraulic cylinder 6, pushing the second hydraulic cylinder 6 to retract until it returns to its original position. Thus, the sequential retraction of the hydraulic cylinders is completed. After the second hydraulic cylinder 6 retracts to its original position, the three-position four-way solenoid valve 3 returns to the neutral position.

[0031] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A dual-cylinder linkage sequential control hydraulic system, comprising a first hydraulic cylinder (5) and a second hydraulic cylinder (6), both the first hydraulic cylinder (5) and the second hydraulic cylinder (6) being mounted on a fixed surface; characterized in that, It also includes a first sequence valve (1), a second sequence valve (2), a three-position four-way solenoid directional valve (3), a first electromagnet (8), a second electromagnet (9), and an oil pump (10). The P port of the three-position four-way solenoid directional valve (3) is connected to the oil pump (10), and the T port of the three-position four-way solenoid directional valve (3) is connected to the oil tank. The A port and B port of the three-position four-way solenoid directional valve (3) are respectively connected to the A port of the first sequence valve (1), the second sequence valve (2), and the rod chamber and rodless chamber of the first hydraulic cylinder (5). The B port of the first sequence valve (1) and the second sequence valve (2) are respectively connected to the rod chamber and rodless chamber of the second hydraulic cylinder (6).

2. The dual-cylinder linkage sequential control hydraulic system as described in claim 1, characterized in that, It also includes a safety valve (4), the P port of which is connected to the oil pump (10), and the T port of which is connected to the oil tank.

3. The dual-cylinder linkage sequential control hydraulic system as described in claim 1, characterized in that, It also includes a limit switch (7), which is located on the moving end of the second hydraulic cylinder (6).

4. The dual-cylinder linkage sequential control hydraulic system as described in claim 1, characterized in that, It also includes a filter screen, which is connected and installed at the fuel tank inlet.

5. The dual-cylinder linkage sequential control hydraulic system as described in claim 1, characterized in that, The oil tank is equipped with an electric heater and a temperature sensor.

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