Multi-power oil cylinder driving system

Abstract

The utility model relates to the technical field of hydraulic control, in particular to a multi-power oil cylinder driving system. The system comprises a hydraulic oil tank, an electric driving unit, an energy storage driving unit and an oil cylinder, the electric driving unit comprises a prime motor, a hydraulic pump and an electromagnetic reversing valve, an oil inlet of the hydraulic pump is connected with the hydraulic oil tank, and an oil outlet of the hydraulic pump is connected with an oil inlet of the electromagnetic reversing valve and the energy storage driving unit through a one-way valve. A first working port of the electromagnetic reversing valve is connected with a rod cavity of the oil cylinder, a second working port of the electromagnetic reversing valve is connected with the energy storage driving unit, the energy storage driving unit comprises a prefill valve, an energy accumulator, a switch valve, a speed limiting valve and a hydraulic control reversing valve, and an oil outlet of the prefill valve is connected with an oil inlet and an oil outlet of the energy accumulator. An oil inlet and an oil outlet of the energy accumulator are connected with a second oil inlet of the hydraulic control reversing valve through the switch valve and the speed limiting valve, and an oil outlet of the hydraulic control reversing valve is connected with a rodless cavity of the oil cylinder. According to the utility model, the oil cylinder is driven by various power driving units, so that the operation safety of the oil cylinder can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic control, and particularly relates to a multi-power oil cylinder driving system. Background Art

[0002] In the existing oil cylinder driving hydraulic system, often one power source is used to drive. When a failure occurs in the power system, the entire system cannot operate, resulting in equipment shutdown and affecting operation and production efficiency. For some special systems, especially those requiring an emergency function system, single-power drive cannot meet the equipment usage requirements. To solve this problem, currently, methods such as adding spare parts, power system redundancy, and additionally adding a power source are mostly adopted on equipment. When these methods are used, on the one hand, it will increase the equipment cost, and on the other hand, it requires time for maintenance, replacement and other operations, which is not applicable to the working conditions with urgent time requirements.

[0003] To solve the above existing problems, there is an urgent need to provide a multi-power oil cylinder driving system that combines multiple power sources and can realize the emergency action of the mechanism without external operations in an emergency state. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the technical problem that in the existing system, one power source is used to drive the oil cylinder, and when a failure occurs in the power system, the entire system cannot operate, affecting operation and production efficiency. The utility model provides a multi-power oil cylinder driving system, which is a new type of hydraulic system that combines multiple powers, provides multi-power backup for the oil cylinder drive, effectively reduces the situation that the oil cylinder cannot extend due to one power failure, and improves the operation safety of the oil cylinder.

[0005] The technical solution adopted by the utility model to achieve the above purpose is: a multi-power oil cylinder driving system, including a hydraulic oil tank, an electric drive unit, an energy storage drive unit, and an oil cylinder.

[0006] The electric drive unit includes a prime mover, a hydraulic pump, and an electromagnetic directional valve. The prime mover is drivingly connected to the hydraulic pump. The inlet of the hydraulic pump is connected to the hydraulic oil tank. The outlet of the hydraulic pump is connected to the inlet of a check valve. The outlet of the check valve is respectively connected to the inlet of the electromagnetic directional valve and the energy storage drive unit. The return port of the electromagnetic directional valve is connected to the hydraulic oil tank through a return oil pipeline. The first working port of the electromagnetic directional valve is connected to the rod chamber of the oil cylinder. The second working port of the electromagnetic directional valve is connected to the rodless chamber of the oil cylinder through the energy storage drive unit.

[0007] The energy storage driving unit includes a filling valve, an accumulator, a switching valve, a speed limiting valve and a hydraulic control directional valve. The oil inlet of the filling valve is connected to the oil outlet of the check valve, the oil outlet of the filling valve is connected to the oil inlet and outlet of the accumulator, and the oil inlet and outlet of the accumulator are respectively connected to the second oil inlet of the hydraulic control directional valve and the control oil port of the hydraulic control directional valve through the switching valve and the speed limiting valve. The first oil inlet of the hydraulic control directional valve is connected to the second working port of the electromagnetic directional valve, the oil outlet of the hydraulic control directional valve is connected to the rodless cavity of the oil cylinder, and the oil return port of the hydraulic control directional valve is connected to the hydraulic oil tank through a pipeline.

[0008] Further, the electric drive unit further includes an electric drive safety valve. The oil inlet of the electric drive safety valve is connected to the oil outlet of the hydraulic pump, and the oil outlet of the electric drive safety valve is connected to the oil return pipeline.

[0009] Further, the electric drive unit further includes an electric drive unloading valve. The oil inlet of the electric drive unloading valve is connected to the oil outlet of the check valve, and the oil outlet of the electric drive unloading valve is connected to the oil return pipeline.

[0010] Further, the electric drive unit further includes a pressure measuring device, and the pressure measuring device is connected to the oil outlet of the check valve.

[0011] Further, the energy storage driving unit further includes a high-pressure detection device and a low-pressure detection device, and the high-pressure detection device and the low-pressure detection device are respectively connected to the pipeline between the filling valve and the accumulator.

[0012] Further, the energy storage driving unit further includes an energy storage driving safety valve. The oil inlet of the energy storage driving safety valve is connected to the oil outlet of the speed limiting valve, and the oil outlet of the energy storage driving safety valve is connected to the oil return pipeline.

[0013] Further, the energy storage driving unit further includes an energy storage driving unloading valve. The oil inlet of the energy storage driving unloading valve is connected to the oil outlet of the speed limiting valve, and the oil outlet of the energy storage driving unloading valve is connected to the oil return pipeline.

[0014] Further, the system further includes a manual driving unit. The manual driving unit includes a manual pump. The oil inlet of the manual pump is connected to the hydraulic oil tank, and the oil outlet of the manual pump is connected to the second oil inlet of the hydraulic control directional valve.

[0015] Further, the first working port of the electromagnetic directional valve is connected to the rod chamber of the oil cylinder through a hydraulic lock, and the oil outlet of the hydraulic control directional valve is connected to the rodless chamber of the oil cylinder through a hydraulic lock.

[0016] Further, the prime mover is an electric motor.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] (1) The multi-power cylinder drive system of the present utility model has three drive modes. The first uses electric control to realize the control of the extension and retraction of the cylinder. The second uses energy storage, and the energy stored in the accumulator is used for the emergency extension control of the cylinder. The third uses manual operation, and manual pump is operated manually to realize the emergency extension control of the cylinder, which can better meet the requirements of the cylinder operation control under emergency conditions. The system is simple, and the operation is easy, which can provide more power sources for the same cylinder drive system, so that the cylinder can still effectively complete the extension action under abnormal or emergency conditions of the equipment.

[0019] (2) In the multi-power cylinder drive system of the present utility model, the energy storage drive unit can realize the functions of liquid filling, liquid discharging and unloading of the accumulator, and can realize the control of the cylinder extension drive through the speed limiting valve. By configuring high / low two-stage pressure detection devices, the control of the energy storage target pressure and the alarm prompt for insufficient energy storage pressure can be realized. A switching valve is installed at the outlet of the accumulator to realize the on / off control and pressure holding function of the accumulator oil circuit. Under emergency conditions, the extension action of the cylinder can be realized by opening the switching valve and controlling the opening of the speed limiting valve, and it can operate independently of the electric drive control device. Brief Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of the multi-power cylinder drive system of the present utility model.

[0021] In the figure: 1. Hydraulic oil tank, 2. Electric drive unit, 21. Hydraulic pump, 22. Prime mover, 23. Electric drive safety valve, 24. Check valve, 25. Pressure measuring device, 26. Electric drive unloading valve, 27. Electromagnetic directional valve, 3. Manual pump, 4. Energy storage drive unit, 41. Liquid filling valve, 42. Energy storage drive safety valve, 43. Energy storage drive unloading valve, 44. Hydraulic control directional valve, 45. Speed limiting valve, 46. High-pressure detection device, 47. Low-pressure detection device, 48. Accumulator, 49. Switching valve, 5. Hydraulic lock, 6. Cylinder. Detailed Description of the Preferred Embodiments

[0022] The present utility model will be described in detail below with reference to the drawings and embodiments, but the present utility model is not limited to the specific embodiments.

[0023] As Figure 1 shown, a multi-power cylinder drive system includes a hydraulic oil tank 1, an electric drive unit 2, an energy storage drive unit 4 and a cylinder 6. The above units and components are connected by a hydraulic oil circuit to form an open hydraulic system to realize the multi-power drive control of the cylinder 6.

[0024] The electric drive unit 2 includes a prime mover 22, a hydraulic pump 21, and an electromagnetic directional control valve 27. The prime mover 22 is an electric motor, and the electromagnetic directional control valve 27 is a three-position four-way solenoid valve. The prime mover 22 is drivingly connected to the hydraulic pump 21. The inlet of the hydraulic pump 21 is connected to the hydraulic oil tank 1, and the outlet of the hydraulic pump 21 is connected to the inlet of a check valve 24. The outlet of the check valve 24 is respectively connected to the inlet of the electromagnetic directional control valve 27 and the energy storage drive unit 4. The oil return port of the electromagnetic directional control valve 27 is connected to the hydraulic oil tank 1 through an oil return pipeline. The first working port of the electromagnetic directional control valve 27 is connected to the rod chamber of the oil cylinder 6 through a hydraulic lock 5, and the second working port of the electromagnetic directional control valve 27 is connected to the rodless chamber of the oil cylinder 6 through the energy storage drive unit 4.

[0025] Preferably, the electric drive unit 2 further includes an electric drive safety valve 23. The inlet of the electric drive safety valve 23 is connected to the outlet of the hydraulic pump 21, and the outlet of the electric drive safety valve 23 is connected to the oil return pipeline.

[0026] Preferably, the electric drive unit 2 further includes an electric drive unloading valve 26. The inlet of the electric drive unloading valve 26 is connected to the outlet of the check valve 24, and the outlet of the electric drive unloading valve 26 is connected to the oil return pipeline.

[0027] Preferably, the electric drive unit 2 further includes a pressure measuring device 25, and the pressure measuring device 25 is connected to the outlet of the check valve 24.

[0028] The electric drive unit can realize the extension and retraction control of the oil cylinder, which is driven by a prime mover such as an electric motor or an engine. The system has functions such as safety pressure limit protection and no-action unloading. The action of the oil cylinder is controlled by the electromagnetic directional control valve. There is an oil circuit interface between this unit and the energy storage drive unit to realize functions such as oil circuit switching and accumulator liquid filling.

[0029] The energy storage drive unit 4 includes a filling valve 41, an accumulator 48, a switching valve 49, a speed limiting valve 45, and a hydraulically controlled directional control valve 44. The inlet of the filling valve 41 is connected to the outlet of the check valve 24, and the outlet of the filling valve 41 is connected to the inlet and outlet of the accumulator 48. The inlet and outlet of the accumulator 48 are respectively connected to the second inlet port of the hydraulically controlled directional control valve 44 and the control oil port of the hydraulically controlled directional control valve 44 through the switching valve 49 and the speed limiting valve 45. The first inlet port of the hydraulically controlled directional control valve 44 is connected to the second working port of the electromagnetic directional control valve 27. The outlet of the hydraulically controlled directional control valve 44 is connected to the rodless chamber of the oil cylinder 6 through a hydraulic lock 5, and the oil return port of the hydraulically controlled directional control valve 44 is connected to the hydraulic oil tank 1 through a pipeline.

[0030] Preferably, the energy storage drive unit 4 further includes a high-pressure detection device 46 and a low-pressure detection device 47, and the high-pressure detection device 46 and the low-pressure detection device 47 are respectively connected to the pipeline between the filling valve 41 and the accumulator 48.

[0031] Preferably, the energy storage driving unit 4 further includes an energy storage driving safety valve 42. The oil inlet of the energy storage driving safety valve 42 is connected to the oil outlet of the speed limiting valve 45, and the oil outlet of the energy storage driving safety valve 42 is connected to the return oil pipeline.

[0032] Preferably, the energy storage driving unit 4 further includes an energy storage driving unloading valve 43. The oil inlet of the energy storage driving unloading valve 43 is connected to the oil outlet of the speed limiting valve 45, and the oil outlet of the energy storage driving unloading valve 43 is connected to the return oil pipeline.

[0033] The energy storage driving unit can realize the functions of liquid filling, liquid discharging and unloading of the accumulator, and can control the driving of the oil cylinder extension through the speed limiting valve. This device obtains high-pressure oil from the electric driving device for liquid filling of the accumulator. The pressure maintaining and unloading functions of the accumulator can be realized inside the device. It also has safety pressure limiting protection. By configuring high / low two-stage pressure detection devices, the control of the target energy storage pressure and the alarm prompt for insufficient energy storage pressure can be realized to ensure the safe use of the system. A switching valve is installed at the outlet of the accumulator to realize the on / off control and pressure maintaining function of the accumulator oil circuit. In an emergency, the extension action of the oil cylinder can be realized by opening the switching valve and controlling the opening of the speed limiting valve. It can operate independently of the electric driving control device, and there is an oil circuit interface between this device and the manual driving unit.

[0034] Preferably, the system further includes a manual driving unit, which is mainly a manual pump 3. The oil inlet of the manual pump 3 is connected to the hydraulic oil tank 1, and the oil outlet of the manual pump 3 is connected to the second oil inlet of the hydraulic control reversing valve 44.

[0035] The manual driving unit can still provide power for the extension of the oil cylinder in the case of the failure of both the electricity and energy storage of the system, meeting the action and safety requirements during emergencies.

[0036] The working principle of a multi-power oil cylinder driving system of the present utility model is as follows: Among the three driving units, they can be connected through pipelines or integrated into one body, and finally, two paths of hydraulic oil are respectively output from the electric driving device 2 and the energy storage driving device 3 to control the action of the oil cylinder 6. All three driving units can act on the oil cylinder 6, and the driving unit can be selected and switched according to different working conditions. Among them, the number of the driven oil cylinders 6 is not limited to the schematic shown in the figure.

[0037] Operation description of the electric drive device 2: The hydraulic pump 21 in the electric drive unit 2 is driven by the prime mover 22. The suction port of the hydraulic pump 21 is connected to the hydraulic oil tank 1. The outlet port of the hydraulic pump 21 is connected to the inlet of the electric drive safety valve 23 through a pipeline, serving as the system safety pressure limit protection. At the same time, it is connected to the inlet of the check valve 24 to shield the damage to the hydraulic pump 21 caused by the system pressure shock. The outlet of the check valve 24 is divided into four paths. The first path is connected to the pressure measuring device 25. A pressure detection device is provided in the oil circuit of the hydraulic pump outlet to display the system pressure and can cooperate with the control system to achieve monitoring or alarm functions. The second path is connected to the electric drive unloading valve 26. The third path is connected to the inlet of the charging valve 41 of the energy storage drive unit 4. The fourth path is connected to the inlet of the three-position four-way solenoid directional control valve 27. After the high-pressure oil passes through the solenoid directional control valve 27, one path is output and connected to the rod chamber interface of the hydraulic lock 5 of the oil cylinder 6, and the other path is output to the first oil inlet of the hydraulic control directional control valve 44 of the energy storage drive unit 4, and then is connected to the rodless chamber interface of the hydraulic lock 5 of the oil cylinder 6 through the outlet of the hydraulic control directional control valve 44, for realizing the electric drive control of the oil cylinder 6. When the oil cylinder 6 needs to extend, the electric drive unloading valve 26 is energized, and the right-side electromagnet of the solenoid directional control valve 27 is energized. The oil fluid enters the rodless chamber of the oil cylinder 6 through the left position of the hydraulic control directional control valve 44, and the oil cylinder 6 extends. When the oil cylinder 6 needs to retract, the electric drive unloading valve 26 is energized, and the left-side electromagnet of the solenoid directional control valve 27 is energized. The oil fluid enters the rod chamber of the oil cylinder 6, and the oil cylinder 6 retracts.

[0038] Action description of the energy storage drive unit 4: Before use, close the outlet switch valve 49 of the accumulator 48, start the prime mover 22 of the electric drive unit 2, the electric drive unloading valve 26 is energized, and the filling valve 41 is energized. At this time, the system fills the accumulator 48 with liquid. When the filling pressure reaches the set value of the high-pressure detection device 46, the system automatically cuts off the power supply to complete the filling process. After the filling is completed, the pressure of the accumulator 48 will decrease due to the internal leakage of the valve components. When it drops to the set value of the low-pressure detection device 47, the system gives an alarm to prompt the replenishment operation. The high-pressure detection device 46 and the low-pressure detection device 47 can feedback the filling pressure and the pressure of the energy storage circuit to realize automatic filling stop and low-pressure alarm; if it is necessary to control the extension of the oil cylinder 6, open the switch valve 49, and the high-pressure oil stored in the accumulator 48 passes through the switch valve 49 and the speed limit valve 45 to reach the second oil inlet and the control oil port of the pilot-operated check valve 44, pushing the pilot-operated check valve 44 to move to the right position, connecting the second oil inlet and the oil outlet of the pilot-operated check valve 44, so that the oil enters the rodless cavity of the oil cylinder 6 and pushes the oil cylinder 6 to extend. The extension speed of the oil cylinder 6 can be controlled by adjusting the opening of the speed limit valve 45, making the operation and use safer. At this time, the rod chamber of the oil cylinder 6 returns to the oil tank 1 through the middle position of the electromagnetic directional valve 27, and the energy storage drive safety valve 42 plays a safety protection role. If it is necessary to unload the accumulator 48, open the switch valve 49 and the speed limit valve 45, control the energy storage drive unloading valve 43 to be energized, and the pressure of the accumulator 48 is unloaded. Under the functions of the filling valve 41 and the unloading valve 43, the accumulator 48 can realize the functions of automatic filling and discharging through the system, reducing the external filling / discharging system, and being more concise and efficient.

[0039] Action description of the manual pump 3: If both the electric drive device 2 and the energy storage drive device 4 fail, the extension of the oil cylinder 6 can be controlled by operating the manual pump 3. The suction port of the manual pump 3 is connected to the hydraulic oil tank 1, and the oil outlet is connected to the second oil inlet of the pilot-operated check valve 44. When operating the manual pump 3, the oil makes the pilot-operated check valve 44 change direction, so that the oil enters the rodless cavity of the oil cylinder 6 and pushes the oil cylinder 6 to extend. Note that the speed limit valve 45 or the switch valve 49 needs to be closed at this time.

[0040] The multi-power oil cylinder drive system of the present utility model has three drive modes. The first mode uses electric control to achieve the control of the extension and retraction actions of the oil cylinder; the second mode uses energy storage, and the energy stored in the accumulator is used for the emergency extension control of the oil cylinder; the third mode is manual, and manual operation of the manual pump is used to achieve the emergency extension control of the oil cylinder, which can better meet the requirements of the oil cylinder operation control in the emergency state. The electric drive device can achieve the extension and retraction actions of the oil cylinder. Through the switching of the hydraulic control reversing valve, the extension action of the oil cylinder can also be driven by the accumulator and manually driven in the non-electric state. Safety valves are provided in different units to effectively ensure the safety during the operation of the three modules. The system is simple and the operation is easy, which can provide more power sources for the same oil cylinder drive system, so that the oil cylinder can still effectively complete the extension action under abnormal or emergency conditions of the equipment.

[0041] The above content is a further detailed description of the present utility model in combination with the preferred technical solutions, and it cannot be determined that the specific implementation of the utility model is limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, simple deductions and replacements can still be made, which should all be regarded as the protection scope of the present utility model.

Claims

1. A multi-power cylinder drive system, characterized in that: It includes a hydraulic oil tank, an electric drive unit, an energy storage drive unit and an oil cylinder. The electric drive unit includes a prime mover, a hydraulic pump and an electromagnetic directional control valve. The prime mover is drivingly connected to the hydraulic pump. The inlet of the hydraulic pump is connected to the hydraulic oil tank. The outlet of the hydraulic pump is connected to the inlet of a check valve. The outlet of the check valve is respectively connected to the inlet of the electromagnetic directional control valve and the energy storage drive unit. The oil return port of the electromagnetic directional control valve is connected to the hydraulic oil tank through an oil return pipeline. The first working port of the electromagnetic directional control valve is connected to the rod chamber of the oil cylinder. The second working port of the electromagnetic directional control valve is connected to the rodless chamber of the oil cylinder through the energy storage drive unit. The energy storage drive unit includes a filling valve, an accumulator, a switching valve, a speed limiting valve and a pilot-operated directional control valve. The inlet of the filling valve is connected to the outlet of the check valve. The outlet of the filling valve is connected to the inlet and outlet of the accumulator. The inlet and outlet of the accumulator are respectively connected to the second inlet of the pilot-operated directional control valve and the control oil port of the pilot-operated directional control valve through the switching valve and the speed limiting valve. The first inlet of the pilot-operated directional control valve is connected to the second working port of the electromagnetic directional control valve. The outlet of the pilot-operated directional control valve is connected to the rodless chamber of the oil cylinder. The oil return port of the pilot-operated directional control valve is connected to the hydraulic oil tank through a pipeline.

2. The multi-power cylinder drive system according to claim 1, characterized in that: The electric drive unit further includes an electric drive safety valve. The inlet of the electric drive safety valve is connected to the outlet of the hydraulic pump. The outlet of the electric drive safety valve is connected to the oil return pipeline.

3. A multi-power cylinder drive system according to claim 1, characterized in that: The electric drive unit further includes an electric drive unloading valve. The inlet of the electric drive unloading valve is connected to the outlet of the check valve. The outlet of the electric drive unloading valve is connected to the oil return pipeline.

4. A multi-power cylinder drive system according to claim 1, characterized in that: The electric drive unit further includes a pressure measuring device. The pressure measuring device is connected to the outlet of the check valve.

5. A multi-power cylinder drive system according to claim 1, characterized in that: The energy storage drive unit further includes a high-pressure detection device and a low-pressure detection device. The high-pressure detection device and the low-pressure detection device are respectively connected to the pipeline between the filling valve and the accumulator.

6. A multi-power cylinder drive system according to claim 1, characterized in that: The energy storage drive unit further includes an energy storage drive safety valve. The inlet of the energy storage drive safety valve is connected to the outlet of the speed limiting valve. The outlet of the energy storage drive safety valve is connected to the oil return pipeline.

7. The multi-power cylinder drive system according to claim 1, characterized in that: The energy storage drive unit further includes an energy storage drive unloading valve. The inlet of the energy storage drive unloading valve is connected to the outlet of the speed limiting valve. The outlet of the energy storage drive unloading valve is connected to the oil return pipeline.

8. A multi-power cylinder drive system according to claim 1, characterized in that: The system further includes a manual drive unit. The manual drive unit includes a manual pump. The inlet of the manual pump is connected to the hydraulic oil tank. The outlet of the manual pump is connected to the second inlet of the pilot-operated directional control valve.

9. The multi-power oil cylinder drive system according to claim 1, characterized in that: The first working port of the electromagnetic directional control valve is connected to the rod chamber of the oil cylinder through a hydraulic lock. The outlet of the pilot-operated directional control valve is connected to the rodless chamber of the oil cylinder through a hydraulic lock.

10. A multi-power cylinder drive system according to any one of claims 1 to 9, characterized in that: The prime mover is an electric motor.

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