Safety type adjustable electric-hydraulic push rod
By incorporating an overflow valve and control system into the electro-hydraulic actuator, the problem of motor overload is solved, enabling overload protection and various adjustment controls for the electro-hydraulic actuator, thus improving the safety and ease of operation of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-30
- Publication Date
- 2026-04-07
AI Technical Summary
Existing electro-hydraulic or electric actuators are prone to overload when the travel limit switch fails, causing the motor to work continuously and damaging the equipment. They lack effective overload protection and adjustment methods.
An overflow valve is installed at the front end of the bidirectional hydraulic pump. In conjunction with the limit pressure value set by the control system, overload protection is achieved through the overflow valve. Stepless adjustment is achieved through the cooperation of the frequency converter and the overflow valve. Stroke control is achieved by combining the magnetic scale and the reading head, thus forming a variety of adjustment and control methods.
It enables precise control in different working scenarios, prevents equipment damage, improves equipment safety and convenience, and supports remote operation.
Smart Images
Figure CN224093623U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a safe adjustable electro-hydraulic actuator, and belongs to the technical field of electric actuator equipment. Background Technology
[0002] In some scenarios where reciprocating push-pull or small-angle rotation effects are required, electric linear actuators are often used. Electric linear actuators are usually divided into electro-hydraulic linear actuators and electric linear actuators.
[0003] Existing electro-hydraulic or electric actuators typically incorporate travel limit switches to prevent the actuator or piston rod from exceeding its travel range and damaging the equipment. However, when the travel limit switch malfunctions, the motor may continuously operate under overload, leading to equipment damage. Therefore, a safe adjustable electro-hydraulic actuator is proposed to address the problems existing in the prior art. Utility Model Content
[0004] The purpose of this invention is to address the deficiencies or shortcomings of existing technologies by providing a safe adjustable electro-hydraulic actuator. By installing an overflow valve at the front end of a bidirectional hydraulic pump, and in conjunction with the limit pressure value set by the control system, when the external force on the piston rod exceeds the rated output force or the piston reaches its end point while the motor is still rotating, the overflow valve quickly overflows to achieve overload protection. Simultaneously, the control system can perform stepless adjustment within the rated speed, output force, and stroke range, meeting the precise control requirements for the speed, force, and stroke of the push-pull rod under different working scenarios, thus achieving optimal performance.
[0005] To achieve the above objectives, the present invention adopts the following technical solution: it includes a hydraulic cylinder 1, a piston rod 2, a driver 3, a bidirectional hydraulic pump 4, and a controller 7. The piston rod 2 is disposed inside the hydraulic cylinder 1, the bidirectional hydraulic pump 4 is disposed at the end of the hydraulic cylinder 1, the top of the driver 3 is detachably connected to the hydraulic cylinder 1 and is drivenly connected to the bidirectional hydraulic pump 4, the controller 7 is connected to the driver 3, the bidirectional hydraulic pump 4 is connected to the hydraulic cylinder 1 via a pipeline with an overflow valve 5, the controller 7 is provided with a control system 10 and is connected to the driver 3, the bidirectional hydraulic pump 4, and the overflow valve 5, and the hydraulic cylinder 1 is also provided with a stroke adjustment module 11 and is connected to the control system 10.
[0006] Furthermore, the controller 7 is equipped with a frequency converter 71 connected to the driver 3. The frequency converter 71 is a Mitsubishi FR-D720S frequency converter. The control system 10 controls the frequency converter 71 to control the driver 3 to form a speed regulation module.
[0007] Furthermore, the control system 10, control driver 3, bidirectional hydraulic pump 4, and overflow valve 5 constitute an output force adjustment module.
[0008] Furthermore, the stroke adjustment module 11 includes a magnetic scale 111 and a reading head 112. The magnetic scale 111 is disposed on the inner wall of the hydraulic cylinder 1, and the reading head 112 is disposed on the end of the piston rod 2 near the overflow valve 5. The stroke adjustment module 11 is connected to the control system.
[0009] Furthermore, the control system 10 uses an STM32F407VGT6 chip.
[0010] Furthermore, the bidirectional hydraulic pump 4 is a bidirectional gear pump, and the driver 3 is equipped with a drive motor that is connected to the gear end of the bidirectional hydraulic pump 4 via a coupling.
[0011] Furthermore, the control system 10 also includes a communication unit 101, which uses a CAN transceiver SN65HVD230 and supports the J1939 protocol.
[0012] Furthermore, a pressure sensor 9 is provided at the rear end of the overflow valve 5 and connected to the control system 10.
[0013] Furthermore, the bidirectional hydraulic pump 4 has a rated thrust ≥9kN and the relief valve 5 has an opening pressure of 10.8kN.
[0014] Furthermore, the driver 3 is provided with a plug 8, and the front end of the hydraulic cylinder 1 is provided with a locking cover 6.
[0015] The working principle of this utility model is as follows: Before use, removing the locking cover 6 allows operation to be initiated via the controller 7. Firstly, during operation, the control system 10 controls the speed of the drive motor via a frequency converter, providing stepless speed regulation and controlling the oil output speed of the bidirectional hydraulic pump 4. This allows for convenient control of the piston rod 2's movement speed via the controller 7. Secondly, an overload protection structure is employed. The control system 10 controls the driver 3, the bidirectional hydraulic pump 4, and the overflow valve 5 to form an output force adjustment module, which, together with the pressure sensor 9, forms a load protection structure. The control system 10 reads the pressure data from the pressure sensor 9 in real time. The opening pressure of the overflow valve 5 is 10.8 kN (1.2 times the rated thrust). When the external force on the piston rod 2 exceeds the rated output force or reaches its endpoint, and the motor is still rotating, the oil pressure reaches 10.8 kN. The control system 10 then feeds back a pressure signal, the overflow valve 5 opens to overflow, and simultaneously, the control system 10 cuts off the output current, causing the driver 3 to stop working. This prevents the drive motor from continuously operating under overload. Third, the overflow valve 5 not only serves as overload protection but is also a key structure for output force adjustment. Based on the required actual thrust, the opening and closing degree of the overflow valve 5 is controlled to adjust the output force, enabling free adjustment of different thrust levels. Fourth, during the movement of the piston rod 2, the end reading head 112, in conjunction with the magnetic scale 111, reads the stroke data and feeds it back to the control system 10. Automated control of the push-pull stroke can be achieved as needed. Three-level adjustment of speed, output force, and stroke better adapts to different scenarios and requirements. Furthermore, the overload protection system provides better protection for the drive mechanism, preventing malfunctions caused by overload and ensuring continuous normal operation of the equipment. Additionally, by setting up a communication unit 101 to upload and report the equipment's operating status, the control terminal can monitor the equipment's operating status in real time and handle malfunctions promptly. Simultaneously, the equipment can also be controlled remotely via a remote control terminal, making it more convenient for remote operation in scenarios where manual on-site operation is inconvenient, thus improving operational safety and convenience.
[0016] After adopting the above technical solution, the beneficial effects of this utility model are as follows: by setting an overflow valve at the front end of the bidirectional hydraulic pump, and in conjunction with the limit pressure value set by the control system, when the external force on the piston rod exceeds the rated output force or the piston reaches the end point while the motor is still rotating, the overflow valve quickly overflows to achieve overload protection. At the same time, the control system can perform stepless adjustment within the rated speed, output force and stroke range, which can meet the precise control of the speed, force and stroke of the push-pull rod under different working scenarios and obtain the best use effect. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of the structure of this utility model;
[0019] Figure 2 yes Figure 1 The second angle view;
[0020] Figure 3 This is an exploded structural diagram of the present invention;
[0021] Figure 4 This is a schematic diagram illustrating the working principle of this utility model.
[0022] Explanation of reference numerals in the attached drawings: 1. Hydraulic cylinder; 2. Piston rod; 3. Driver; 4. Two-way hydraulic pump; 5. Overflow valve; 6. Locking cover; 7. Controller; 8. Plug; 9. Pressure sensor; 10. Control system; 11. Stroke adjustment module; 101. Communication unit; 111. Magnetic scale; 112. Reading head. Detailed Implementation
[0023] See Figures 1-4As shown, the technical solution adopted in this specific embodiment is as follows: it includes a hydraulic cylinder 1, a piston rod 2, a driver 3, a bidirectional hydraulic pump 4, and a controller 7. The piston rod 2 is disposed inside the hydraulic cylinder 1, the bidirectional hydraulic pump 4 is disposed at the end of the hydraulic cylinder 1, the top of the driver 3 is detachably connected to the hydraulic cylinder 1 and is drivenly connected to the bidirectional hydraulic pump 4, the controller 7 is connected to the driver 3, the bidirectional hydraulic pump 4 is connected to the hydraulic cylinder 1 via a pipeline with an overflow valve 5, the controller 7 is provided with a control system 10 and is connected to the driver 3, the bidirectional hydraulic pump 4, and the overflow valve 5, and the hydraulic cylinder 1 is also provided with a stroke adjustment module 11 and is connected to the control system 10. The existing electro-hydraulic actuator structure lacks effective overload protection measures. Furthermore, the adjustment method is relatively simple. Therefore, this embodiment provides an overload protection structure and multiple adjustment and control methods. An overflow valve is set at the front end of the bidirectional hydraulic pump. One pipeline is directly connected to the hydraulic cylinder, and the other is connected to the inlet end of the overflow valve, forming a Y-shaped oil outlet pipeline structure. The outlet end of the overflow valve is connected back to the oil tank of the bidirectional hydraulic pump through a pipeline to form a loop. When the external force on the piston rod exceeds the rated output force or reaches the end point, and the motor is still rotating, the oil pressure reaches 10.8kN. The control system feeds back the pressure signal, the overflow valve opens to overflow, and at the same time the control system cuts off the output current, the driver stops working, and feeds back to the control terminal to arrange operators to check the fault in time, thereby avoiding damage to the equipment.
[0024] During use, the operational requirements vary depending on the items to be pushed and pulled. First, the control system can control the driver to perform stepless speed regulation, driving the bidirectional hydraulic pump to perform stepless speed adjustment, thereby achieving stepless adjustment of the piston rod's movement speed. Second, the control system can adjust the output force by controlling the opening and closing of the overflow valve. Third, the stroke adjustment module can precisely control the stroke distance of the piston rod, thus enabling specific stroke control according to different usage requirements.
[0025] More specifically, the controller 7 is equipped with a frequency converter 71 connected to the driver 3. The frequency converter 71 is a Mitsubishi FR-D720S frequency converter. The control system 10 controls the frequency converter 71 to control the driver 3, forming a speed regulation module. In this embodiment, the speed regulation module is specifically composed of the control system, the frequency converter, and the driver, which performs stepless speed regulation in the range of 0.1-0.5m / s.
[0026] More specifically, the control system 10, the control driver 3, the bidirectional hydraulic pump 4, and the relief valve 5 constitute an output force adjustment module. In this embodiment, the control system can drive the bidirectional hydraulic pump to output hydraulic oil at different pressures by controlling the speed of the driver, and then control the specific flow rate and pressure by controlling the opening and closing degree of the relief valve, thereby realizing the adjustment and control of the output force, and enabling push and pull operations on objects of different weights.
[0027] More specifically, the stroke adjustment module 11 includes a magnetic scale 111 and a reading head 112. The magnetic scale 111 is disposed on the inner wall of the hydraulic cylinder 1, and the reading head 112 is disposed on the end of the piston rod 2 near the overflow valve 5. The stroke adjustment module 11 is connected to the control system. In this embodiment, the stroke adjustment reads the movement data on the magnetic scale through the reading head, and feeds it back to the control system to control the driver to control the movement stroke.
[0028] More specifically, the control system 10 uses an STM32F407VGT6 chip. In this embodiment, the control system uses an STM32F407VGT6 chip to individually control and coordinate all devices.
[0029] More specifically, the bidirectional hydraulic pump 4 is a bidirectional gear pump, and the driver 3 is equipped with a drive motor that is connected to the gear end of the bidirectional hydraulic pump 4 through a coupling. In this embodiment, a side-driven structure is adopted, and the drive motor is connected to the bidirectional hydraulic pump through a coupling to control the bidirectional operation of the hydraulic oil.
[0030] More specifically, the control system 10 also includes a communication unit 101. The communication unit 101 uses a CAN transceiver SN65HVD230 and supports the J1939 protocol. In this embodiment, a communication unit is also provided, and a connection port is provided on the controller. After the connection is completed, the specific operating data of the equipment can be sent to the control terminal through the communication unit. The control terminal can remotely control the push rod by inputting operation information through remote control. In some situations where it is not suitable for on-site operation by operators, remote control can be performed, thereby effectively improving the safety of the operation.
[0031] More specifically, the relief valve 5 is equipped with a pressure sensor 9 connected to the control system 10 at its rear end. The bidirectional hydraulic pump 4 has a rated thrust ≥ 9kN, and the relief valve 5 has an opening pressure of 10.8kN. In this embodiment, the operation of the relief valve is controlled by the control system to control the valve core opening degree. It can also automatically open for relief based on the pressure sensor and the control system, further ensuring the overload protection effect. The opening pressure of the relief valve is set to be higher than the rated thrust of the bidirectional hydraulic pump to prevent oversensitivity, so that it can effectively relieve pressure when the pressure is abnormal.
[0032] More specifically, the driver 3 is equipped with a plug 8, and the front end of the hydraulic cylinder 1 is equipped with a locking cover 6. When using the device, the plug must be plugged in to power it on before it can be used. When using the device, the locking cover is screwed on to protect the piston rod. The locking cover can be removed when the device is in use.
[0033] The working principle of this utility model is as follows: Before use, removing the locking cover 6 allows operation to be initiated via the controller 7. Firstly, during operation, the control system 10 controls the speed of the drive motor via a frequency converter, providing stepless speed regulation and controlling the oil output speed of the bidirectional hydraulic pump 4. This allows for convenient control of the piston rod 2's movement speed via the controller 7. Secondly, an overload protection structure is employed. The control system 10 controls the driver 3, the bidirectional hydraulic pump 4, and the overflow valve 5 to form an output force adjustment module, which, together with the pressure sensor 9, forms a load protection structure. The control system 10 reads the pressure data from the pressure sensor 9 in real time. The opening pressure of the overflow valve 5 is 10.8 kN (1.2 times the rated thrust). When the external force on the piston rod 2 exceeds the rated output force or reaches its endpoint, and the motor is still rotating, the oil pressure reaches 10.8 kN. The control system 10 then feeds back a pressure signal, the overflow valve 5 opens to overflow, and simultaneously, the control system 10 cuts off the output current, causing the driver 3 to stop working. This prevents the drive motor from continuously operating under overload. Third, the overflow valve 5 not only serves as overload protection but is also a key structure for output force adjustment. Based on the required actual thrust, the opening and closing degree of the overflow valve 5 is controlled to adjust the output force, enabling free adjustment of different thrust levels. Fourth, during the movement of the piston rod 2, the end reading head 112, in conjunction with the magnetic scale 111, reads the stroke data and feeds it back to the control system 10. Automated control of the push-pull stroke can be achieved as needed. Three-level adjustment of speed, output force, and stroke better adapts to different scenarios and requirements. Furthermore, the overload protection system provides better protection for the drive mechanism, preventing malfunctions caused by overload and ensuring continuous normal operation of the equipment. Additionally, by setting up a communication unit 101 to upload and report the equipment's operating status, the control terminal can monitor the equipment's operating status in real time and handle malfunctions promptly. Simultaneously, the equipment can also be controlled remotely via a remote control terminal, making it more convenient for remote operation in scenarios where manual on-site operation is inconvenient, thus improving operational safety and convenience.
[0034] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.
Claims
1. A safety-type adjustable electro-hydraulic actuator, characterized in that: It includes a hydraulic cylinder (1), a piston rod (2), a driver (3), a bidirectional hydraulic pump (4), and a controller (7). The piston rod (2) is located inside the hydraulic cylinder (1), and the bidirectional hydraulic pump (4) is located at the end of the hydraulic cylinder (1). The top of the driver (3) is detachably connected to the hydraulic cylinder (1) and is connected to the bidirectional hydraulic pump (4) via a transmission. The controller (7) is connected to the driver (3). The bidirectional hydraulic pump (4) is connected to the hydraulic cylinder (1) via a pipeline with an overflow valve (5). The controller (7) contains a control system (10) which is connected to the driver (3), the bidirectional hydraulic pump (4), and the overflow valve (5). The hydraulic cylinder (1) also contains a stroke adjustment module (11) which is connected to the control system (10).
2. The safety-type adjustable electro-hydraulic actuator according to claim 1, characterized in that: The controller (7) is equipped with a frequency converter (71) connected to the driver (3). The frequency converter (71) is a Mitsubishi FR-D (720)S frequency converter. The control system (10) controls the frequency converter (71) to control the driver (3) to form a speed regulation module.
3. The safety-type adjustable electro-hydraulic actuator according to claim 1, characterized in that: The control system (10), control driver (3), bidirectional hydraulic pump (4) and relief valve (5) constitute the output force adjustment module.
4. A safety-type adjustable electro-hydraulic actuator according to claim 1, characterized in that: The stroke adjustment module (11) includes a magnetic scale (111) and a reading head (112). The magnetic scale (111) is located on the inner wall of the hydraulic cylinder (1), and the reading head (112) is located on the end of the piston rod (2) near the overflow valve (5). The stroke adjustment module (11) is connected to the control system.
5. A safety-type adjustable electro-hydraulic actuator according to claim 1, characterized in that: The control system (10) uses an STM32F407VGT6 chip.
6. A safety-type adjustable electro-hydraulic actuator according to claim 1, characterized in that: The bidirectional hydraulic pump (4) is a bidirectional gear pump, and the driver (3) is equipped with a drive motor that is connected to the gear end of the bidirectional hydraulic pump (4) through a coupling.
7. A safety-type adjustable electro-hydraulic actuator according to claim 1, characterized in that: The control system (10) further includes a communication unit (101), which uses a CAN transceiver SN65HVD230 and supports the J1939 protocol.
8. A safety-type adjustable electro-hydraulic actuator according to claim 1, characterized in that: The overflow valve (5) is equipped with a pressure sensor (9) at its rear end, which is connected to the control system (10).
9. A safety-type adjustable electro-hydraulic actuator according to claim 1, characterized in that: The bidirectional hydraulic pump (4) has a rated thrust ≥9kN and an overflow valve (5) with an opening pressure of 10.8kN.
10. A safety-type adjustable electro-hydraulic actuator according to claim 1, characterized in that: The driver (3) is provided with a plug (8), and the front end of the hydraulic cylinder (1) is provided with a locking cover (6).