Hydraulic control system with fixed stroke and quick return stroke
The design of the hydraulic control system solves the problems of high noise, large footprint, and insufficient pressure in mechanical cam and crankshaft structures. It achieves hydraulic control with fixed stroke and fast return, which is suitable for the assembly of small and medium-sized parts, reduces noise and saves space.
Patent Information
- Application Number
- CN202423253365.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-28
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-12-28
AI Technical Summary
In the existing technology, mechanical cam and crankshaft structures are noisy, complex, and occupy a large area when assembling small and medium-sized parts, and the cylinders cannot meet the high pressure strength requirements.
The hydraulic control system, which adopts a fixed stroke and fast return, includes a controller, oil tank, motor-oil pump assembly, control valve, actuator cylinder, and accumulator. It achieves precise control of the actuator cylinder through a high-frequency response servo valve and pressure sensor, and uses liquid as the transmission medium. Combined with the pressure characteristics of the accumulator, it realizes fixed stroke and fast return.
It achieves high-pressure output, low-noise transmission, and saves space, making it suitable for the rapid return requirements of assembling small and medium-sized parts.
Smart Images
Figure CN223498283U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hydraulic control system technology, and in particular to a hydraulic control system with fixed stroke and fast return. Background Technology
[0002] Currently, in the assembly of large quantities of small and medium-sized parts, assembly line assembly is mostly adopted, using cylinders, mechanical cams, and crankshaft structures to achieve constant stroke and constant pressure. However, the disadvantages of mechanical cam and crankshaft structures are that they are noisy and complex in structure. Their drive mechanism and actuator need to be rigidly transmitted, resulting in a large footprint. When the actuator uses cylinders to cut the corners of the mold and perform molding, a large pressure is required. Most cylinders on the market have a maximum working pressure of about 0.7 MPa, and the use of cylinders cannot meet the requirement of outputting a large pressure. Summary of the Invention
[0003] The purpose of this invention is to solve the problems existing in the prior art by proposing a fast return, fixed stroke hydraulic control system.
[0004] To achieve the above objectives, the present invention adopts the following technical solution: a hydraulic control system with fixed stroke and rapid return, comprising a controller, an oil tank, a motor-oil pump assembly, a control valve, an actuator cylinder, and an accumulator, characterized in that: the oil tank is connected to the control valve, the control valve is connected to the rodless chamber of the actuator cylinder, the rod chamber of the actuator cylinder is connected to the accumulator, a second pressure sensor for detecting the pressure of the accumulator is connected between the accumulator and the rod chamber of the actuator cylinder, the control valve controls the inflow and outflow of pressurized oil in the oil tank, and the control valve, the second pressure sensor, and the controller are electrically connected.
[0005] Furthermore, an accumulator safety overflow valve is also connected to the accumulator inlet.
[0006] Furthermore, a system safety relief valve and a check valve are connected between the control valve and the oil tank.
[0007] Furthermore, a first pressure sensor for detecting the rodless chamber of the actuator is connected to the inlet of the rodless chamber of the actuator, and the first pressure sensor is electrically connected to the controller.
[0008] Furthermore, a rodless chamber safety relief valve is also connected to the inlet of the rodless chamber of the actuator cylinder.
[0009] Furthermore, the control valve is a high-frequency response servo valve.
[0010] Compared with existing technologies, this utility model provides a hydraulic control system with fixed stroke and fast return. The advantages of this utility model are:
[0011] 1. It can provide high pressure, fixed route, and fast return;
[0012] 2. Hydraulic transmission has low noise. Its transmission uses liquid as a medium and can change direction at will through pipelines. The motor and oil pump unit can be placed in a place far away from the actuator cylinder, saving space. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the hydraulic principle framework of this utility model;
[0014] In the diagram: 1. Oil tank, 2. Motor oil pump assembly, 3. Check valve, 4. High-frequency response servo valve, 5. First pressure sensor, 6. Rodless chamber safety relief valve, 7. Actuating cylinder, 71. Rodless chamber of the actuating cylinder, 72. Rod chamber of the actuating cylinder, 8. Second pressure sensor, 9. Accumulator, 10. Accumulator safety relief valve, 11. System safety relief valve. Detailed Implementation
[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0016] Example 1, please refer to Figure 1 A hydraulic control system with fixed stroke and fast return includes a controller, an oil tank 1, a motor-oil pump assembly 2, a control valve, an actuator cylinder 7, and an accumulator 9. The oil tank 1 is connected to the control valve, which is connected to the rodless chamber 71 of the actuator cylinder. The rod chamber 72 of the actuator cylinder is connected to the accumulator 9. A second pressure sensor 8 is connected between the accumulator 9 and the rod chamber 72 of the actuator cylinder to detect the pressure of the accumulator 9. The control valve controls the inflow and outflow of pressurized oil in the rodless chamber 71 of the actuator cylinder. The control valve, the second pressure sensor 8, and the controller are electrically connected.
[0017] By controlling the flow of pressurized oil into or out of the actuator cylinder 7 through the control valve, and in conjunction with the pressure in the accumulator 9, the actuator cylinder 7 can achieve a fixed stroke and a rapid return.
[0018] In Example 2, an accumulator safety relief valve 10 is also connected to the inlet of the accumulator 9. The accumulator safety relief valve 10 is connected to the oil tank 1 and can protect the accumulator 9. Once the accumulator safety relief valve 10 exceeds the set pressure, the accumulator safety relief valve 10 will release the excess pressure oil to the oil tank.
[0019] In Example 3, a system safety relief valve 11 is connected between the control valve and the oil tank 1, and a check valve 3 is connected between the system safety relief valve 11 and the oil tank 1. The check valve 3 can protect the motor oil pump assembly 2 from being impacted by reverse pressure oil. The pressure oil flowing out through the check valve 3 can only return to the oil tank 1 through the control valve. Similarly, the system safety relief valve 11 can protect the entire hydraulic system and prevent the system pressure oil from exceeding the set pressure.
[0020] In Example 4, a first pressure sensor 5 for detecting the rodless chamber 71 of the actuator is connected to the inlet of the rodless chamber 71. A rodless chamber safety relief valve 6 is also connected to the inlet of the rodless chamber 71. The rodless chamber safety relief valve 6 is connected to the oil tank 1. The first pressure sensor 5 is electrically connected to the controller.
[0021] The first pressure sensor 5 can detect the pressure at the rodless chamber 71 of the actuator cylinder. When the pressure of the rodless chamber safety relief valve 6 exceeds the set pressure, the excess pressure oil is released to the oil tank 1.
[0022] Example 5: In this example, the control valve is a high-frequency response servo valve 4. The high-frequency response servo valve 4 can respond to the control signal quickly and accurately, and realize precise control of the pressure in the actuator cylinder 7. The T port of the high-frequency response servo valve 4 is connected to the oil tank 1.
[0023] The present invention includes the following steps in use:
[0024] S1: The motor oil pump group 2 starts, the YV1 of the high-frequency response servo valve 4 is energized, the pressure oil flows into the rodless chamber 71 of the actuator oil cylinder through the one-way valve 3, and the pressure oil in the rod chamber 72 of the actuator oil cylinder is squeezed into the accumulator 9, and the stroke of the actuator oil cylinder 7 is fixed through the accumulator 9.
[0025] S2: When the second pressure sensor 8 detects that the accumulator 9 has reached the set pressure value, it feeds back to the controller. The controller controls the YV2 of the high-frequency response servo valve 4 to be energized. The pressure oil in the rodless chamber 71 of the actuator flows back to the oil tank 1 through the T port of the high-frequency response servo valve 4. The pressure in the rodless chamber 71 of the actuator returns to zero. The pressure oil in the accumulator 9 pushes the rod chamber 72 of the actuator to return quickly.
[0026] Because the accumulator 9 has the characteristics of fixed pressure and fixed volume, the accumulator 9 is connected to the rod chamber 72 of the actuator cylinder. When the pressurized oil in the rod chamber 72 of the actuator cylinder enters the accumulator 9 and reaches a certain capacity, the pressure inside the accumulator 9 will rise. When the accumulator 9 is filled with pressurized oil, the actuator cylinder 7 can no longer push out, thus achieving a fixed stroke effect.
[0027] When the accumulator 9 reaches a certain pressure, the second pressure sensor 8 sends a signal to the high-frequency response servo valve 4, and the YV2 of the high-frequency response servo valve 4 is energized. The rodless chamber 71 of the actuator cylinder is connected to the T port of the high-frequency response servo valve 4, so that the pressure oil in the rodless chamber 71 of the actuator cylinder flows back to the oil tank 1. The rodless chamber 71 of the actuator cylinder loses pressure, and the pressure accumulated in the accumulator 9 will enter the rod chamber 72 of the actuator cylinder to push the cylinder back. Since the output pressure of the accumulator 9 is very rapid, a rapid return effect will be achieved.
[0028] When this system is working, the YV1 and YV2 terminals of the high-frequency response servo valve 4 are energized respectively. This, in conjunction with the accumulator 9, controls the fixed stroke and rapid return of the actuator cylinder 7. When YV1 of the high-frequency response servo valve 4 is energized, the P and A ports of the valve are connected. Pressure oil in the rod chamber 72 of the actuator cylinder enters the accumulator 9 and reaches a certain capacity, causing the pressure inside the accumulator 9 to rise. When the accumulator 9 is full of pressure oil, the actuator cylinder 7 can no longer be pushed out, thus precisely fixing its stroke. When YV2 of the high-frequency response servo valve 4 is energized, the A and T ports are connected. Pressure oil in the accumulator 9 pushes the actuator cylinder 7 back through the rod chamber 72, enabling rapid return. This completes one operation cycle. Because the system uses hydraulic oil as the transmission medium, the pipeline route can be freely changed, and the motor and pump unit can be centrally located far from the actuator cylinder 7, saving space in the workshop.
[0029] In summary, the above description is merely a preferred embodiment of the present utility model, but the scope of protection of the present utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present utility model, based on the technical solution and inventive concept of the present utility model, should be included within the scope of protection of the present utility model.
Claims
1. A hydraulic control system with fixed stroke and fast return, comprising a controller, an oil tank (1), a motor-driven oil pump assembly (2), a control valve, an actuator cylinder (7), and an accumulator (9), characterized in that: The oil tank (1) is connected to the control valve, which is connected to the rodless chamber (71) of the actuator cylinder. The rod chamber (72) of the actuator cylinder is connected to the accumulator (9). A second pressure sensor (8) is connected between the accumulator (9) and the rod chamber (72) of the actuator cylinder to detect the pressure of the accumulator (9). The control valve controls the inflow and outflow of pressurized oil in the rodless chamber (71) of the actuator cylinder. The control valve, the second pressure sensor (8), and the controller are electrically connected.
2. The hydraulic control system with fixed stroke and rapid return according to claim 1, characterized in that: An accumulator safety overflow valve (10) is also connected to the inlet of the accumulator (9).
3. A hydraulic control system with fixed stroke and rapid return according to claim 1, characterized in that: The control valve and the oil tank (1) are connected by a system safety relief valve (11) and a check valve (3).
4. A hydraulic control system with fixed stroke and rapid return according to claim 1, characterized in that: A first pressure sensor (5) for detecting the pressure of the rodless chamber (71) of the actuator is connected at the inlet of the actuator cylinder. The first pressure sensor (5) is electrically connected to the controller.
5. A hydraulic control system with fixed stroke and rapid return according to claim 4, characterized in that: A rodless chamber safety relief valve (6) is also connected to the inlet of the rodless chamber (71) of the actuator.
6. A hydraulic control system with fixed stroke and rapid return according to claim 1, characterized in that: The control valve is a high-frequency response servo valve (4).