Valve block for electro-hydraulic integrated push rod

Abstract

The valve block for the electro-hydraulic integrated push rod comprises a valve block body and a PLC, the front end of the valve block body is provided with a threaded connector in threaded connection with the inner wall of an inner cavity of an oil tank, and the valve block body and the threaded connector are provided with motor shaft via holes for a motor shaft to penetrate through; an oil inlet communicated with an oil suction pipe on the side wall of the oil tank body is formed in the end face of the threaded connector, an oil passing opening communicated with an oil tank oil conveying pipe is formed in the end face of the valve block body, and the oil inlet and the oil passing opening are connected through a valve block oil conveying pipe arranged on the valve block body. The threaded connector is arranged at the front end of the valve block body and connected with the oil tank assembly in a threaded mode, installation and detachment are convenient, the valve block originally arranged in the oil tank assembly is arranged at the end of the oil tank assembly, maintenance and detachment of the valve block are convenient, and meanwhile the multiple one-way valves and the overflow valves are arranged on the valve block body. The flow direction of oil entering the valve block can be controlled, and then a piston rod of the hydraulic cylinder is driven to act.

Description

Technical Field

[0001] This utility model relates to the field of electro-hydraulic actuator technology, specifically to a valve block for an electro-hydraulic integrated actuator. Background Technology

[0002] An electro-hydraulic actuator is a hydraulically driven manipulator that integrates mechanics, electricity, and hydraulics. It is suitable for reciprocating push-pull and linear / rotational movements at a certain angle. During operation, the electro-hydraulic actuator controls the forward and reverse rotation of a servo motor, which drives a bidirectional gear pump to output pressurized oil in both directions. This oil is then delivered to the hydraulic cylinder via a hydraulic control valve, thus realizing the reciprocating motion of the cylinder piston rod and achieving its basic working principle.

[0003] However, since the existing hydraulic control valve and the two-way gear pump are both located inside the oil tank, the entire oil tank assembly needs to be removed before the hydraulic control valve can be repaired, which is inconvenient. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a valve block for an electro-hydraulic integrated push rod, which can realize the separate connection between the valve block and the bidirectional gear pump and the oil tank assembly, so as to facilitate the maintenance and replacement of the valve block separately.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows.

[0006] A valve block for an electro-hydraulic integrated actuator includes a valve block body and a PLC controller. The front end of the valve block body is provided with a threaded joint that is threaded to the inner wall of the oil tank cavity. The valve block body and the threaded joint are provided with a motor shaft through hole through which the motor shaft passes. The end face of the threaded joint is provided with an oil inlet that communicates with an oil suction pipe on the side wall of the oil tank body. The end face of the valve block body is provided with an oil outlet that communicates with an oil delivery pipe in the oil tank. The oil inlet and the oil outlet are respectively connected by a valve block oil delivery pipe provided on the valve block body.

[0007] The valve block for the electro-hydraulic integrated actuator described above also has an overflow pipe inside the main body of the valve block, which is connected to the inner cavity of the oil tank.

[0008] The valve block for the electro-hydraulic integrated actuator described above has a pressure sensor and a hydraulic connector mounted on the top surface of the valve block body, and the output end of the pressure sensor is connected to the input end of the PLC controller.

[0009] The aforementioned valve block for an electro-hydraulic integrated actuator has a second check valve, a third relief valve, a second hydraulically controlled check valve, and a third hydraulically controlled check valve mounted on the front side of the valve block body. The controlled ends of the second check valve, the third relief valve, the second hydraulically controlled check valve, and the third hydraulically controlled check valve are respectively connected to the output end of a PLC controller. The rear side of the valve block body has a first relief valve, a first check valve, a second relief valve, and a first hydraulically controlled check valve mounted on it. The controlled ends of the first relief valve, the first check valve, the second relief valve, and the first hydraulically controlled check valve are respectively connected to the output end of a PLC controller.

[0010] In the aforementioned electro-hydraulic integrated actuator valve block, the inlet of the first one-way valve is connected to the inner cavity of the oil tank, the outlet of the first one-way valve is connected to the left inlet of the bidirectional gear pump, the left outlet of the bidirectional gear pump is connected to the left oil flow path, and the left oil flow path consists of the left valve block oil supply pipe inside the valve block, the left oil tank oil supply pipe, and the left long oil pipe inside the hydraulic cylinder; the second overflow valve is installed on the left overflow pipe connecting the left oil flow path and the inner cavity of the oil tank.

[0011] In the aforementioned electro-hydraulic integrated actuator valve block, the oil inlet of the second check valve is connected to the inner cavity of the oil tank, the oil outlet of the second check valve is connected to the right oil inlet of the bidirectional gear pump, and the right oil outlet of the bidirectional gear pump is connected to the right oil flow path. The right oil flow path consists of the right valve block oil supply pipe, the right oil tank oil supply pipe, and the right short oil pipe inside the hydraulic cylinder. The second hydraulically controlled check valve and the third hydraulically controlled check valve are sequentially arranged on the right oil flow path.

[0012] In the aforementioned electro-hydraulic integrated actuator valve block, the first overflow valve is installed on the right high-pressure overflow pipeline connecting the right oil flow path and the inner cavity of the oil tank. The right high-pressure overflow pipeline is installed along the oil delivery direction on the right oil flow path located at the front end of the third hydraulic control check valve.

[0013] In the aforementioned electro-hydraulic integrated push rod valve block, the third overflow valve is installed on the right low-pressure overflow pipe that connects the right oil flow path to the inner cavity of the oil tank. The right low-pressure overflow pipe is installed on the right oil flow path near the right oil outlet of the bidirectional gear pump along the oil delivery direction.

[0014] In the aforementioned electro-hydraulic integrated actuator valve block, the right-side oil flow path is connected to the inner cavity of the oil tank through a branch pipe, and a first hydraulic control check valve is installed on the branch pipe, which is located in front of the right-side low-pressure overflow pipeline along the oil delivery direction.

[0015] Due to the adoption of the above technical solutions, the technological progress achieved by this utility model is as follows.

[0016] This utility model provides a valve block for an electro-hydraulic integrated actuator. A threaded joint is provided at the front end of the valve block body to connect to the oil tank assembly, which is convenient for installation and disassembly. The valve block, which was originally located inside the oil tank assembly, is located at the end of the oil tank assembly, which facilitates the maintenance and disassembly of the valve block. At the same time, the valve block body is provided with multiple check valves and relief valves, which can control the flow direction of the oil entering the valve block, thereby driving the piston rod of the hydraulic cylinder to move. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the specific structure of the present utility model;

[0018] Figure 2 This is a schematic diagram of the specific structure of the top surface of this utility model;

[0019] Figure 3 This is a cross-sectional view of the internal structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the specific structure of the front side of this utility model;

[0021] Figure 5 This is a schematic diagram of the specific structure of the rear side of this utility model;

[0022] Figure 6 This is a schematic diagram illustrating the working principle of this utility model.

[0023] Among them: 100. Hydraulic cylinder, 2200. Valve block body, 2201. Threaded joint, 2202. Motor shaft through hole, 2203. Oil inlet, 2204. Oil outlet, 2205. Pressure sensor, 2206. Hydraulic joint, 2207. Valve block oil supply pipe, 2208. Overflow pipe, 2209. First overflow valve, 2210. First check valve, 2211. Second overflow valve, 2212. First hydraulically controlled check valve, 2213. Second check valve, 2214. Third overflow valve, 2215. Second hydraulically controlled check valve, 2216. Third hydraulically controlled check valve, 2102. Bidirectional gear pump, 2301. Oil tank inner cavity. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] A valve block for an electro-hydraulic integrated actuator, such as Figures 1 to 6 As shown, it includes a valve block body 2200. The front end of the valve block body 2200 is provided with a threaded joint 2201 that is threaded to the inner wall of the tail end of the oil tank cavity 2301. The valve block body 2200 and the threaded joint 2201 are provided with a motor shaft through hole 2202 through which the motor shaft passes.

[0026] The threaded connector 2201 has an oil inlet 2203 on its end face that is connected to the oil suction pipe on the side wall of the oil tank body. The valve block body 2200 has an oil outlet 2204 on its end face that is connected to the oil supply pipe of the oil tank. The oil inlet 2203 and the oil outlet 2204 are connected to each other by a valve block oil supply pipe 2207 provided on the valve block body 2200.

[0027] The valve block body 2200 is also equipped with an overflow pipe 2208, which is connected to the inner cavity 2301 of the oil tank to facilitate the delivery of overflowing oil to the inner cavity of the oil tank.

[0028] A pressure sensor 2205 and a hydraulic connector 2206 are installed on the top surface of the valve block body 2200. The output end of the pressure sensor 2205 is connected to the input end of the PLC controller. The pressure sensor 2205 is used to detect the oil circuit pressure so as to control the relief valve to release pressure in a timely manner.

[0029] The front side of the valve block body 2200 is equipped with a second check valve 2213, a third overflow valve 2214, a second hydraulically controlled check valve 2215, and a third hydraulically controlled check valve 2216.

[0030] The valve block body 2200 is equipped with a first overflow valve 2209, a first check valve 2210, a second overflow valve 2211, and a first hydraulic check valve 2212.

[0031] The inlet of the first check valve 2210 is connected to the inner cavity 2301 of the oil tank, the outlet of the first check valve 2210 is connected to the left inlet of the bidirectional gear pump 2102, and the left outlet of the bidirectional gear pump 2102 is connected to the left oil flow path.

[0032] The left-side oil flow path consists of the left-side valve block oil supply pipe 2207 inside the valve block, the left-side oil tank oil supply pipe, and the oil pipe inside the hydraulic cylinder, and is used to supply oil to the rod chamber on the front side of the piston block at the right end of the piston rod.

[0033] The second overflow valve 2211 is installed on the left overflow pipe 2208 that connects the left oil flow path with the inner cavity 2301 of the oil tank.

[0034] The oil inlet of the second check valve 2213 is connected to the inner cavity 2301 of the oil tank, and the oil outlet of the second check valve 2213 is connected to the right oil inlet of the bidirectional gear pump 2102. The right oil outlet of the bidirectional gear pump 2102 is connected to the right oil flow path.

[0035] The right-side oil flow path consists of the right-side valve block oil supply pipe 2207, the right-side oil tank oil supply pipe, and the right-side short oil pipe inside the hydraulic cylinder. The second hydraulic control check valve 2215 and the third hydraulic control check valve 2216 are sequentially installed on the right-side oil flow path.

[0036] The first overflow valve 2209 is installed on the right high-pressure overflow pipeline 2208 that connects the right oil flow path with the inner cavity 2301 of the oil tank.

[0037] The right-side high-pressure overflow pipeline 2208 is located on the right-side oil flow path at the front end of the third hydraulic control check valve 2216 along the oil delivery direction, so that the oil can be discharged in time when the oil pressure is too high, without waiting for the hydraulic control check valve to open.

[0038] The third overflow valve 2214 is installed on the right low-pressure overflow pipe 2208 that connects the right oil flow path with the inner cavity 2301 of the oil tank. The right low-pressure overflow pipe 2208 is installed on the right oil flow path near the right oil outlet of the bidirectional gear pump along the oil delivery direction.

[0039] The oil flow path on the right side is connected to the inner cavity 2301 of the oil tank through a branch pipe. The first hydraulic check valve 2212 is installed on the branch pipe, which is located in front of the low-pressure overflow pipeline 2208 on the right side along the oil delivery direction.

[0040] The controlled terminals of the first overflow valve 2209, the first check valve 2210, the second overflow valve 2211, the first hydraulically controlled check valve 2212, the second check valve 2213, the third overflow valve 2214, the second hydraulically controlled check valve 2215, and the third hydraulically controlled check valve 2216 are respectively connected to the output terminals of the PLC controller.

[0041] When the drive motor drives the bidirectional gear pump, the bidirectional gear pump 2102 converts the oil in the oil tank assembly into high-pressure oil and sends it into the valve block through the oil suction pipe. The oil flow direction is regulated and balanced through the internal pipeline of the valve block and the cooperation of check valve, relief valve, etc., thereby controlling the movement of the hydraulic cylinder piston rod.

[0042] The working principle of the valve block during the operation of hydraulic cylinder 100 is as follows (for reference). Figure 6 :

[0043] When it is necessary to push the hydraulic cylinder piston rod to the right and retract the piston rod, the bidirectional gear pump 2102 draws oil from the inner cavity 2301 of the oil tank through the first one-way valve 2210, converts it into high-pressure oil, and sends it into the inner cavity of the cylinder on the front side of the piston block at the right end of the piston rod through the oil tank oil supply pipe. The oil in the inner cavity of the cylinder on the rear side of the piston block at the right end of the piston rod will flow to the overflow pipe 2208 through the oil tank oil supply pipe.

[0044] When the pressure sensor 2205 detects that the oil pressure in the cylinder cavity behind the piston block at the right end of the piston rod exceeds 30MPa, it controls the first overflow valve 2209 to work and send the discharged oil to the oil tank cavity 2301.

[0045] When the pressure sensor 2205 detects that the oil pressure in the cylinder cavity behind the piston block at the right end of the piston rod is lower than 30MPa and higher than 4MPa, the first relief valve 2209 is not in operation. At this time, pressurized oil is supplied to the second hydraulic check valve 2215 and the third hydraulic check valve 2216 respectively to open the second hydraulic check valve 2215 and the third hydraulic check valve 2216. Figure 6 The dotted line indicates the pressure oil delivery circuit. At this time, the third overflow valve 2214 is controlled to work, and the discharged oil is sent to the inner cavity 2301 of the oil tank.

[0046] When the pressure sensor 2205 detects that the oil pressure in the cylinder cavity behind the piston block at the right end of the piston rod is lower than 4MPa, neither the first relief valve 2209 nor the third relief valve 2214 is in working condition. At this time, pressurized oil is supplied to the first hydraulic control check valve 2212, the second hydraulic control check valve 2215, and the third hydraulic control check valve 2216 respectively to open the first hydraulic control check valve 2212, the second hydraulic control check valve 2215, and the third hydraulic control check valve 2216. Since the first hydraulic control check valve 2212 is directly connected to the inner cavity 2301 of the oil tank through the pipeline, the discharged oil will flow directly into the inner cavity 2301 of the oil tank.

[0047] When it is necessary to push the hydraulic cylinder piston rod to the left and extend the piston rod, the bidirectional gear pump 2102 draws oil from the inner cavity 2301 of the oil tank through the second check valve 2213 and converts it into high-pressure oil. The oil is then sent through the second hydraulic control check valve 2215 and the third hydraulic control check valve 2216, and then through the oil tank oil supply pipe into the inner cavity of the cylinder behind the piston block at the right end of the piston rod. The oil in the inner cavity of the cylinder in front of the piston block at the right end of the piston rod will flow through the oil tank oil supply pipe to the overflow pipe 2208, so that the oil is delivered to the inner cavity of the oil tank through the second overflow valve 2211.

[0048] This utility model provides a valve block for an electro-hydraulic integrated actuator. A threaded joint is provided at the front end of the valve block body to connect to the oil tank assembly, which is convenient for installation and disassembly. The valve block, which was originally located inside the oil tank assembly, is located at the end of the oil tank assembly, which facilitates the maintenance and disassembly of the valve block. At the same time, the valve block body is provided with multiple check valves and relief valves, which can control the flow direction of the oil entering the valve block, thereby driving the piston rod of the hydraulic cylinder to move.

Claims

1. A valve block for an electro-hydraulic integrated actuator, characterized in that: The device includes a valve block body (2200) and a PLC controller. The front end of the valve block body (2200) is provided with a threaded joint (2201) that is threaded to the inner wall of the inner cavity (2301) of the oil tank. The valve block body (2200) and the threaded joint (2201) are provided with a motor shaft through hole (2202) through which the motor shaft passes. The end face of the threaded joint (2201) is provided with an oil inlet (2203) that is connected to the oil suction pipe on the side wall of the oil tank body. The end face of the valve block body (2200) is provided with an oil outlet (2204) that is connected to the oil supply pipe of the oil tank. The oil inlet (2203) and the oil outlet (2204) are respectively connected by a valve block oil supply pipe (2207) provided on the valve block body (2200).

2. The valve block for an electro-hydraulic integrated actuator according to claim 1, characterized in that: The valve block body (2200) is also provided with an overflow pipe (2208), which is connected to the inner cavity of the oil tank (2301).

3. The valve block for an electro-hydraulic integrated actuator according to claim 1, characterized in that: A pressure sensor (2205) and a hydraulic connector (2206) are installed on the top surface of the valve block body (2200). The output end of the pressure sensor (2205) is connected to the input end of the PLC controller.

4. The valve block for an electro-hydraulic integrated actuator according to claim 1, characterized in that: The front side of the valve block body (2200) is equipped with a second check valve (2213), a third relief valve (2214), a second hydraulically controlled check valve (2215), and a third hydraulically controlled check valve (2216). The controlled ends of the second check valve (2213), the third relief valve (2214), the second hydraulically controlled check valve (2215), and the third hydraulically controlled check valve (2216) are respectively connected to the output end of the PLC controller. The rear side of the valve block body (2200) is equipped with a first relief valve (2209), a first check valve (2210), a second relief valve (2211), and a first hydraulically controlled check valve (2212). The controlled ends of the first relief valve (2209), the first check valve (2210), the second relief valve (2211), and the first hydraulically controlled check valve (2212) are respectively connected to the output end of the PLC controller.

5. A valve block for an electro-hydraulic integrated actuator according to claim 4, characterized in that: The inlet of the first check valve (2210) is connected to the inner cavity of the oil tank (2301), the outlet of the first check valve (2210) is connected to the left inlet of the bidirectional gear pump (2102), the left outlet of the bidirectional gear pump (2102) is connected to the left oil flow path, and the left oil flow path is composed of the left valve block oil supply pipe (2207) inside the valve block, the left oil tank oil supply pipe, and the left long oil pipe inside the hydraulic cylinder; the second overflow valve (2211) is set on the left overflow pipe (2208) that connects the left oil flow path and the inner cavity of the oil tank (2301).

6. A valve block for an electro-hydraulic integrated actuator according to claim 4, characterized in that: The oil inlet of the second check valve (2213) is connected to the inner cavity (2301) of the oil tank, and the oil outlet of the second check valve (2213) is connected to the right oil inlet of the bidirectional gear pump (2102). The right oil outlet of the bidirectional gear pump (2102) is connected to the right oil flow path. The right oil flow path consists of the right valve block oil supply pipe (2207), the right oil tank oil supply pipe, and the right short oil pipe inside the hydraulic cylinder. The second hydraulic control check valve (2215) and the third hydraulic control check valve (2216) are sequentially arranged on the right oil flow path.

7. A valve block for an electro-hydraulic integrated actuator according to claim 6, characterized in that: The first overflow valve (2209) is installed on the right high pressure overflow pipeline (2208) that connects the right oil flow path with the inner cavity of the oil tank (2301). The right high pressure overflow pipeline (2208) is installed on the right oil flow path located at the front end of the third hydraulic control check valve (2216) along the oil delivery direction.

8. A valve block for an electro-hydraulic integrated actuator according to claim 6, characterized in that: The third overflow valve (2214) is installed on the right low-pressure overflow pipe (2208) that connects the right oil flow path with the inner cavity of the oil tank (2301). The right low-pressure overflow pipe (2208) is installed on the right oil flow path near the right oil outlet of the bidirectional gear pump along the oil delivery direction.

9. A valve block for an electro-hydraulic integrated actuator according to claim 6, characterized in that: The right-side oil flow path is connected to the inner cavity of the oil tank (2301) through a branch pipe. The first hydraulic control check valve (2212) is installed on the branch pipe, which is located in front of the right-side low-pressure overflow pipeline (2208) along the oil delivery direction.

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