Electro-hydraulic integrated push rod

Abstract

The electro-hydraulic integrated push rod comprises a hydraulic cylinder and a drive control assembly which are sequentially connected, the hydraulic cylinder comprises a cylinder barrel assembly, and a piston rod is arranged in the cylinder barrel assembly in a sliding mode; the driving control assembly comprises a driving module, a valve block and an oil tank assembly, and the valve block is mounted at the tail end of the oil tank assembly; the driving module comprises a driving motor, the driving motor is arranged at the rear end of the valve block, a motor shaft of the driving motor penetrates through the center of the valve block to be connected with a bidirectional gear pump, and the bidirectional gear pump is arranged in the oil tank assembly; the system further comprises a PLC control system. The PLC control system comprises a PLC and a power module. The hydraulic cylinder and the driving control assembly are arranged in a split mode, meanwhile, the valve block is arranged on the outer side of the oil tank, the requirements that an electro-hydraulic integrated push rod is compact in structure and easy to disassemble and assemble are met, maintenance and replacement are convenient, and the characteristics that an electric push rod is small in size and flexible in configuration and the characteristics that an oil hydraulic cylinder is stable in work, high in reliability and small in high-speed impact force can be integrated.

Description

Technical Field

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

[0002] Electro-hydraulic actuators are hydraulically driven manipulators that integrate mechanics, electricity, and hydraulics. They are suitable for reciprocating push-pull and linear / rotational movements at a certain angle. They are universal drives, similar to servo motors and cylinders, and are widely used in metallurgy, mining, power, coal, machinery, transportation, grain, chemical, cement, water conservancy, building materials, and transportation industries.

[0003] During use, the electro-hydraulic actuator controls the forward and reverse rotation of the servo motor, which drives the bidirectional gear pump to output pressure oil in both directions. The oil is then sent to the cylinder via the hydraulic control valve, thus realizing the reciprocating motion of the cylinder piston rod and achieving its basic working principle.

[0004] Existing electro-hydraulic actuators have simple structures but are large in size, making them inconvenient to use, assemble, and maintain. They cannot meet the needs of actual use. Moreover, since they are often used in dusty environments, dust in the air can easily enter the hydraulic oil, contaminating the oil and causing the hydraulic cylinder to malfunction.

[0005] For example, Chinese utility model patent CN2074400U discloses an electro-hydraulic actuator, which consists of a motor, a bidirectional gear pump, an oil circuit integration block, a hydraulic cylinder, a coupling, an overflow valve, and a housing. The coupling, bidirectional gear pump, oil circuit integration block, hydraulic cylinder, and overflow valve are all sealed within the housing. While this utility model patent offers impact resistance, a compact structure, and flexible configuration, the fact that all components are sealed within the housing necessitates the complete removal of the housing for maintenance, making repairs relatively complex. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide an electro-hydraulic integrated actuator that combines the advantages of small size and flexible configuration of electric actuators with the advantages of stable operation, high reliability and low high-speed impact of hydraulic cylinders. In addition, the electro-hydraulic integrated actuator needs to meet the requirements of compact structure, easy disassembly and assembly, and convenient maintenance and replacement.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows.

[0008] An electro-hydraulic integrated actuator includes a hydraulic cylinder and a drive control assembly connected in sequence, which are assembled and connected by a connecting flange and bolt assembly. The hydraulic cylinder includes a cylinder assembly with a piston rod slidably disposed within it. The drive control assembly includes a drive module, a valve block, and an oil tank assembly, with the valve block mounted at the rear end of the oil tank assembly. The drive module includes a drive motor located at the rear end of the valve block, with its motor shaft passing through the center of the valve block and connected to a bidirectional gear pump, which is located inside the oil tank assembly. The actuator also includes a PLC controller and a power module, with the controlled end of the drive motor connected to the output end of the PLC controller.

[0009] The aforementioned electro-hydraulic integrated push rod has a magnetic ring installed at the right end of the piston rod at the rear end of the cylinder assembly. A displacement sensor is installed inside the cylinder assembly, and the output end of the displacement sensor is connected to the input end of the PLC controller.

[0010] The aforementioned electro-hydraulic integrated actuator includes a cylinder assembly comprising a cylinder body with a fully penetrating cylinder cavity at its center, the cylinder cavity being slidably fitted with a piston rod; a cylinder head sealing member is provided at the front end of the cylinder cavity, and a cylinder tail sealing member is provided at the rear end of the cylinder cavity, with the piston rod passing through the cylinder head sealing member; a long oil pipe and a short oil pipe are respectively provided inside the outer side wall of the cylinder body, arranged axially along the cylinder body, the oil outlet of the long oil pipe communicating with the cylinder cavity located in front of the piston block at the right end of the piston rod, and the oil outlet of the short oil pipe communicating with the cylinder cavity located behind the piston block at the right end of the piston rod.

[0011] The aforementioned electro-hydraulic integrated actuator has an anti-rotation rod mounting seat on the outer wall of the cylinder body, a connecting plate at the front end of the piston rod, an anti-rotation rod on the end face of the connecting plate near the piston rod, and the other end of the anti-rotation rod slidingly fitted with the anti-rotation rod mounting seat.

[0012] The aforementioned electro-hydraulic integrated actuator has a protective cover around the piston rod extending from the cylinder body. One end of the protective cover is fixedly mounted on the side wall of the piston rod, and the other end is fitted onto the front of the cylinder body. The protective cover has a corrugated retractable structure.

[0013] The aforementioned electro-hydraulic integrated actuator includes an oil tank assembly comprising an oil tank body with an inner cavity at its center; two oil tank supply pipes are provided on the side wall of the oil tank body, which are arranged opposite each other and connected to a valve block, one oil tank supply pipe being connected to a corresponding long oil pipe and the other oil tank supply pipe being connected to a corresponding short oil pipe; an oil suction pipe is provided on the side wall of the oil tank body, which is connected to a bidirectional gear pump, and the other end of the oil suction pipe is connected to the valve block.

[0014] The aforementioned electro-hydraulic integrated actuator has a base plug at the front end of the oil tank cavity, and a piston is installed on the inner side of the oil tank cavity near the base plug. The piston and the base plug are connected by a spring.

[0015] The aforementioned electro-hydraulic integrated actuator includes a valve block body. The front end of the valve block body is provided with a threaded joint that is threaded to the inner wall of the tail end of the oil tank body. An oil inlet is provided on the end face of the threaded joint, which is connected to an oil suction pipe on the side wall of the oil tank body. An oil outlet is provided on the end face of the valve block body, which is connected to an oil delivery pipe in the oil tank. The oil inlet and the oil outlet are respectively connected by an oil delivery pipe provided on the valve block body. An overflow pipe is also provided inside the valve block body, which is connected to the inner cavity of the oil tank.

[0016] The aforementioned electro-hydraulic integrated actuator has a pressure sensor and a hydraulic connector mounted on the top surface of the valve block body. A second check valve, a third relief valve, a second hydraulically controlled check valve, and a third hydraulically controlled check valve are mounted on the front side of the valve block body. A first relief valve, a first check valve, a second relief valve, and a first hydraulically controlled check valve are mounted on the rear side of the valve block body. The output of the pressure sensor is connected to the input of the PLC controller. The controlled ends of the first relief valve, the first check valve, the second relief valve, the first hydraulically controlled check valve, 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 of the PLC controller.

[0017] The aforementioned electro-hydraulic integrated actuator has the following configuration: the inlet of the first check valve is connected to the inner cavity of the oil tank; the outlet of the first check valve is connected to the left inlet of the bidirectional gear pump; and the left outlet of the bidirectional gear pump is connected to the left oil flow path. The second overflow valve is located on the left overflow pipe connecting the left oil flow path to the inner cavity of the oil tank. 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 long oil pipe inside the hydraulic cylinder. The inlet of the second check valve is connected to the inner cavity of the oil tank. The oil outlet of the bidirectional gear pump is connected to the right inlet, and the right outlet of the bidirectional gear pump is connected to the right oil flow path; the first overflow valve is set on the right high-pressure overflow pipe connecting the right oil flow path and the inner cavity of the oil tank, and the third overflow valve is set on the right low-pressure overflow pipe connecting the right oil flow path and the inner cavity of the oil tank; the right oil flow path consists of the right valve block oil supply pipe, the right oil tank oil supply pipe, and the short oil pipe inside the hydraulic cylinder, and the second hydraulic control check valve and the third hydraulic control check valve are set on the right oil flow path in sequence.

[0018] The technological advancements achieved by this utility model are as follows, due to the adoption of the above technical solutions.

[0019] This utility model provides an electro-hydraulic integrated actuator, which separates the hydraulic cylinder and drive control assembly, with the valve block located on the outside of the oil tank. This design meets the requirements of a compact electro-hydraulic integrated actuator, facilitating easy disassembly and replacement, and combining the advantages of a small size and flexible configuration of an electric actuator with the stable operation, high reliability, and low high-speed impact of a hydraulic cylinder. Furthermore, a corrugated, retractable protective cover is installed between the cylinder assembly and the piston rod to shield the piston rod, changing shape with the piston rod's movement to prevent dust and impurities from entering the cylinder cavity and contaminating the oil. An anti-rotation rod guides the piston rod's movement, preventing deviation. By installing check valves, hydraulically controlled check valves, and overflow valves on the valve block, along with long and short oil pipes connecting to the cylinder cavities on both sides of the right end of the piston rod, the oil in the cylinder cavities on both sides of the right end of the piston rod is balanced and stabilized during piston rod movement. The cylinder vent seat and oil tank vent seat ensure timely venting, preventing damage to the hydraulic cylinder due to excessive pressure. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the specific structure of the present utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0022] Figure 3 This is a top view of the present invention.

[0023] Figure 4 This is a schematic diagram of the specific structure of the hydraulic cylinder described in this utility model;

[0024] Figure 5 This is a schematic diagram of the internal structure of the hydraulic cylinder described in this utility model;

[0025] Figure 6 This is a top view of the hydraulic cylinder described in this utility model;

[0026] Figure 7 This is a schematic diagram showing the specific structure of the internal piping distribution of the cylinder assembly described in this utility model;

[0027] Figure 8 This is another sectional view of the cylinder assembly described in this utility model;

[0028] Figure 9 This is a schematic diagram of the specific structure of the drive control assembly described in this utility model;

[0029] Figure 10 This is a schematic diagram of the internal structure of the drive control assembly described in this utility model;

[0030] Figure 11 This is a side view of the fuel tank assembly described in this utility model;

[0031] Figure 12 for Figure 11 Sectional view along line AA in the middle;

[0032] Figure 13 for Figure 11 BB-direction sectional view in the middle;

[0033] Figure 14 This is a partial cross-sectional view of the fuel tank assembly described in this utility model;

[0034] Figure 15 This is a schematic diagram of the specific structure of the valve block described in this utility model;

[0035] Figure 16 This is a schematic diagram of the specific structure of the top surface of the valve block described in this utility model;

[0036] Figure 17 This is a cross-sectional view of the internal structure of the valve block described in this utility model;

[0037] Figure 18 This is a schematic diagram of the specific structure of the front side of the valve block described in this utility model;

[0038] Figure 19 This is a schematic diagram of the specific structure of the rear side of the valve block described in this utility model;

[0039] Figure 20 This is a schematic diagram illustrating the working principle of the valve block described in this utility model.

[0040] Among them: 100. Hydraulic cylinder, 120. Piston rod, 130. Connecting plate, 140. Anti-rotation rod, 150. Protective cover, 160. Cylinder head sealing part, 170. Cylinder tail sealing part, 180. Magnetic ring, 190. Displacement sensor;

[0041] 110. Cylinder assembly; 1100. Cylinder body; 1101. Support leg; 1102. Cylinder cavity; 1103. Anti-rotation rod mounting seat; 1104. Long oil pipe; 1105. Short oil pipe; 1106. Cylinder exhaust seat;

[0042] 200. Drive control assembly; 240. Base plug; 250. Piston; 260. Spring;

[0043] 210. Drive module; 2100. Drive motor; 2101. Coupling; 2102. Bidirectional gear pump;

[0044] 220. Valve block; 2200. Valve block body; 2201. Threaded connector; 2202. Motor shaft through hole; 2203. Oil inlet; 2204. Oil outlet; 2205. Pressure sensor; 2206. Hydraulic connector; 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;

[0045] 230. Fuel tank assembly; 2300. Fuel tank body; 2301. Fuel tank inner cavity; 2302. Fuel suction pipe; 2303. Foot; 2304. Fuel tank oil supply pipe; 2305. Fuel tank oil inlet pipe; 2306. Fuel tank exhaust seat; 2307. Ear plate; 2308. Exhaust port. Detailed Implementation

[0046] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0047] Electro-hydraulic integrated actuators, such as Figures 1 to 20 As shown, it includes a hydraulic cylinder 100 and a drive control assembly 200 connected in sequence. The hydraulic cylinder 100 and the drive control assembly 200 are connected by a connecting flange and bolt assembly. It also includes a PLC controller and a power module.

[0048] The hydraulic cylinder 100 includes a cylinder assembly 110, a piston rod 120 is slidably disposed inside the cylinder assembly 110, a magnetic ring 180 is installed at the end of the piston rod 120 located at the rear end inside the cylinder assembly, and a displacement sensor 190 is installed inside the cylinder assembly 110. The actual displacement of the piston rod 120 is detected by the cooperation between the magnetic ring 180 and the displacement sensor 190.

[0049] The output terminal of the displacement sensor 190 is connected to the input terminal of the PLC controller. The displacement sensor 190 is one of the following: Hall effect sensor, magnetostrictive sensor, magnetic scale, and inductive proximity sensor. The displacement sensor 190 mainly senses the change in the magnetic field strength of the magnetic ring 180 when the magnetic ring 180 moves with the piston rod 120, and then converts the magnetic field change signal into a displacement electrical signal for output.

[0050] For example, when the displacement sensor 190 is a magnetostrictive sensor, the movement of the magnetic ring 180 will cause magnetic field disturbance. The waveguide wire in the sensor will generate a magnetostrictive effect, converting the magnetic field change into a mechanical stress wave. By measuring the propagation time difference of the stress wave, an electrical signal (such as pulse width or voltage) proportional to the displacement will be output, and the corresponding displacement can be obtained.

[0051] Cylinder assembly 110 includes cylinder body 1100, such as Figure 7 As shown, the cylinder body 1100 has a fully penetrating cylinder inner cavity 1102 at its center, and the cylinder inner cavity 1102 is slidably fitted with the piston rod 120.

[0052] The bottom of the cylinder body 1100 is provided with a support leg 1101, which is used to support the cylinder body 1100. There are two support legs 1101.

[0053] A cylinder head sealing member 160 is provided at the front end of the cylinder inner cavity 1102. At this time, the front end of the cylinder inner cavity is the extended end of the piston rod 120. The piston rod 120 passes through the cylinder head sealing member 160. A cylinder tail sealing member 170 is provided at the rear end of the cylinder inner cavity 1102 to ensure the sealing of the cylinder inner cavity.

[0054] An anti-rotation rod mounting seat 1103 is provided on the outer wall of the cylinder body 1100. A connecting plate 130 is provided at the front end of the piston rod 120. An anti-rotation rod 140 is provided on the end face of the connecting plate 130 near the piston rod 120. The other end of the anti-rotation rod 140 is slidably fitted with the anti-rotation rod mounting seat 1103, so as to move together with the piston rod and guide the movement of the piston rod, while preventing the piston rod from deviating and rotating.

[0055] The outer wall of the cylinder body 1100 is provided with a long oil pipe 1104 and a short oil pipe 1105 arranged along the axial direction of the cylinder body, and the long oil pipe 1104 and the short oil pipe 1105 are arranged opposite to each other.

[0056] The oil outlet of the long oil pipe 1104 is connected to the cylinder cavity 1102 located in front of the piston block at the right end of the piston rod 120, and is used to deliver oil to the cylinder cavity 1102 in front of the piston block at the right end of the piston rod 120, thereby pushing the piston rod 120 to retract backward.

[0057] The oil outlet of the short oil pipe 1105 is connected to the cylinder cavity 1102 located behind the piston block at the right end of the piston rod 120, and is used to supply oil to the cylinder cavity 1102 behind the piston block at the right end of the piston rod 120, thereby pushing the piston rod 120 to extend forward.

[0058] A cylinder exhaust seat 1106 communicating with the cylinder cavity 1102 is installed on the side wall of the cylinder body 1100 located in front of the piston block at the right end of the piston rod 120 and on the side wall of the cylinder body 1100 located behind the piston block at the right end of the piston rod 120, respectively.

[0059] A protective cover 150 is provided around the piston rod 120 that extends out of the cylinder body 1100. One end of the protective cover 150 is fixedly installed on the side wall of the piston rod 120, and the other end is fitted onto the front of the cylinder body 1100.

[0060] The protective cover 150 has a corrugated retractable structure that can change with the movement of the piston rod 120 to prevent dust and impurities from entering the cylinder cavity during the movement of the piston rod, causing oil contamination inside the cylinder cavity and leading to malfunction of the hydraulic cylinder.

[0061] The drive control assembly 200 includes a drive module 210, a valve block 220, and an oil tank assembly 230. The valve block 220 is installed at the rear end of the oil tank assembly 230.

[0062] The drive module 210 includes a drive motor 2100. The motor shaft of the drive motor 2100 is connected to a bidirectional gear pump 2102 via a coupling 2101. The bidirectional gear pump 2102 is located inside the oil tank assembly 230. The drive motor 2100 drives the bidirectional gear pump 2102 to achieve the transportation of oil inside the oil tank assembly.

[0063] The drive motor 2100 is located at the rear end of the valve block 220. The motor shaft of the drive motor 2100 passes through the center of the valve block 220 and is connected to the bidirectional gear pump 2102. The controlled end of the drive motor 2100 is connected to the output end of the PLC controller.

[0064] The fuel tank assembly 230 includes a fuel tank body 2300, a fuel tank cavity 2301 is provided at the center of the fuel tank body 2300, and two feet 2303 are provided on the outer side of the fuel tank body 2300 to support the fuel tank body 2300.

[0065] The rear end of the oil tank body 2300 is provided with a lug plate 2307 for easy connection with the valve block 220. The lug plate 2307 is connected to the valve block 220 by a bolt assembly.

[0066] Two oil tank supply pipes 2304 are provided on the side wall of the oil tank body 2300 and are connected to the valve block 220. One oil tank supply pipe 2304 is connected to the corresponding long oil pipe 1104, and the other oil tank supply pipe 2304 is connected to the corresponding short oil pipe 1105.

[0067] An oil suction pipe 2302 connected to a bidirectional gear pump 2102 is provided on the side wall of the oil tank body 2300. The other end of the oil suction pipe 2302 is connected to a valve block 220, which facilitates the delivery of oil in the inner cavity 2301 of the oil tank to the bidirectional gear pump 2102, and then to the oil tank delivery pipe 2304 via the valve block 220.

[0068] The side wall of the main body 2300 of the oil tank is also provided with an oil tank inlet pipe 2305 and an oil tank vent seat 2306 that are connected to the inner cavity 2301 of the oil tank. The oil tank inlet pipe 2305 is connected to the oil tank and is used to deliver oil to the inner cavity of the oil tank. The oil tank vent seat 2306 is used to balance the pressure in the inner cavity of the oil tank.

[0069] A base plug 240 is provided at the front end of the inner cavity 2301 of the oil tank to seal the inner cavity of the oil tank. A piston 250 is installed on the inner side of the inner cavity 2301 of the oil tank near the base plug 240. The piston 250 and the base plug 240 are connected by a spring 260.

[0070] An exhaust port 2308 is provided on the side wall of the oil tank body 2300 located between the base plug 240 and the piston 250, which can balance the pressure on both sides of the piston when the piston moves.

[0071] The valve block 220 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 body 2300. 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.

[0072] The threaded connector 2201 has an oil inlet 2203 on its end face that communicates with the oil suction pipe 2302 on the side wall of the oil tank body. The valve block body 2200 has an oil outlet 2204 on its end face that communicates with the oil tank oil supply pipe 2304. The oil inlet 2203 and the oil outlet 2204 are connected by a valve block oil supply pipe 2207 on the valve block body 2200.

[0073] The valve block body 2200 is also provided with an overflow pipe 2208, which is connected to the inner cavity 2301 of the oil tank, so as to facilitate the delivery of overflowing oil to the inner cavity 2301 of the oil tank.

[0074] 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.

[0075] 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.

[0076] 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 hydraulically controlled check valve 2212.

[0077] 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.

[0078] The left-side oil flow route consists of the left-side valve block oil supply pipe 2207 inside the valve block 220, the left-side oil tank oil supply pipe 2304, and the long oil pipe 1104 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.

[0079] 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.

[0080] 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.

[0081] 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 2304, and the short oil pipe 1105 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] When the drive motor 2100 drives the bidirectional gear pump 2102 to operate, the bidirectional gear pump converts the oil in the oil tank assembly into high-pressure oil and sends it into the valve block 220 through the oil suction pipe 2301. The oil flow direction is regulated and balanced through the internal pipeline of the valve block 220 and the cooperation of check valve, relief valve, etc., thereby controlling the movement of the hydraulic cylinder piston rod.

[0088] During the operation of hydraulic cylinder 100, the internal working principle of valve block 220 is as follows (for reference). Figure 20 :

[0089] 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 and converts it into high-pressure oil. The oil is then sent to 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 2304 and the long oil pipe 1104. 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 short oil pipe 1105 and the corresponding oil tank oil supply pipe 2304.

[0090] 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.

[0091] 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 20 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.

[0092] 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.

[0093] 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 2304 and the short oil pipe 1105 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 long oil pipe 1104 and the corresponding oil tank oil supply pipe 2304 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.

[0094] During the retraction or extension of the hydraulic cylinder piston rod, the magnetic field changes as the magnetic ring moves with the piston rod. The displacement sensor converts the magnetic field change signal into a displacement electrical signal and sends the displacement signal to the PLC controller, which in turn controls the check valve and relief valve inside the valve block to achieve precise control of the piston rod movement.

[0095] This utility model provides an electro-hydraulic integrated actuator, which separates the hydraulic cylinder and drive control assembly, with the valve block located on the outside of the oil tank. This design meets the requirements of a compact electro-hydraulic integrated actuator, facilitating easy disassembly and replacement, and combining the advantages of a small size and flexible configuration of an electric actuator with the stable operation, high reliability, and low high-speed impact of a hydraulic cylinder. Furthermore, a corrugated, retractable protective cover is installed between the cylinder assembly and the piston rod to shield the piston rod, changing shape with the piston rod's movement to prevent dust and impurities from entering the cylinder cavity and contaminating the oil. An anti-rotation rod guides the piston rod's movement, preventing deviation. By installing check valves, hydraulically controlled check valves, and overflow valves on the valve block, along with long and short oil pipes connecting to the cylinder cavities on both sides of the right end of the piston rod, the oil in the cylinder cavities on both sides of the right end of the piston rod is balanced and stabilized during piston rod movement. The cylinder vent seat and oil tank vent seat ensure timely venting, preventing damage to the hydraulic cylinder due to excessive pressure.

Claims

1. An electro-hydraulic integrated actuator, characterized in that: The system includes a hydraulic cylinder (100) and a drive control assembly (200) connected in sequence, which are assembled and connected by a connecting flange and bolt assembly. The hydraulic cylinder (100) includes a cylinder assembly (110) and a piston rod (120) slidably disposed within the cylinder assembly (110). The drive control assembly (200) includes a drive module (210), a valve block (220), and an oil tank assembly (230), with the valve block (220) mounted on the oil tank. The rear end of the assembly (230); the drive module (210) includes a drive motor (2100), the drive motor (2100) is located at the rear end of the valve block (220), the motor shaft of the drive motor (2100) passes through the center of the valve block (220) and is connected to the bidirectional gear pump (2102), the bidirectional gear pump (2102) is located inside the oil tank assembly (230); it also includes a PLC controller and a power module, the controlled end of the drive motor (2100) is connected to the output end of the PLC controller.

2. The electro-hydraulic integrated actuator according to claim 1, characterized in that: A magnetic ring (180) is installed on the right end of the piston rod (120) located at the rear end of the cylinder assembly. A displacement sensor (190) is installed inside the cylinder assembly (110). The output end of the displacement sensor (190) is connected to the input end of the PLC controller.

3. The electro-hydraulic integrated actuator according to claim 1, characterized in that: The cylinder assembly (110) includes a cylinder body (1100), with a fully penetrating cylinder cavity (1102) at the center of the cylinder body (1100). The cylinder cavity (1102) is slidably fitted with the piston rod (120). A cylinder head sealing member (160) is provided at the front end of the cylinder cavity (1102), and a cylinder tail sealing member (170) is provided at the rear end of the cylinder cavity (1102). The piston rod (120) penetrates the cylinder head. A sealing component (160) is provided; a long oil pipe (1104) and a short oil pipe (1105) are respectively provided on the inner side wall of the cylinder body (1100) along the axial direction of the cylinder body. The oil outlet of the long oil pipe (1104) is connected to the cylinder cavity (1102) located in front of the piston block at the right end of the piston rod (120), and the oil outlet of the short oil pipe (1105) is connected to the cylinder cavity (1102) located behind the piston block at the right end of the piston rod (120).

4. The electro-hydraulic integrated actuator according to claim 3, characterized in that: The outer wall of the cylinder body (1100) is provided with an anti-rotation rod mounting seat (1103), the front end of the piston rod (120) is provided with a connecting plate (130), and an anti-rotation rod (140) is provided on the end face of the connecting plate (130) near the piston rod (120). The other end of the anti-rotation rod (140) is slidably fitted with the anti-rotation rod mounting seat (1103).

5. The electro-hydraulic integrated actuator according to claim 3, characterized in that: A protective cover (150) is provided around the piston rod (120) that extends out of the cylinder body (1100). One end of the protective cover (150) is fixedly installed on the side wall of the piston rod (120), and the other end is fitted onto the front of the cylinder body (1100). The protective cover (150) is a corrugated retractable structure.

6. The electro-hydraulic integrated actuator according to claim 3, characterized in that: The oil tank assembly (230) includes an oil tank body (2300), and an oil tank cavity (2301) is provided in the center of the oil tank body (2300). Two oil tank supply pipes (2304) are provided on the side wall of the oil tank body (2300) and are arranged opposite to each other and connected to the valve block (220). One oil tank supply pipe (2304) is connected to the corresponding long oil pipe (1104), and the other oil tank supply pipe (2304) is connected to the corresponding short oil pipe (1105). An oil suction pipe (2302) is provided on the side wall of the oil tank body (2300) and is connected to the bidirectional gear pump (2102). The other end of the oil suction pipe (2302) is connected to the valve block (220).

7. The electro-hydraulic integrated actuator according to claim 6, characterized in that: A base plug (240) is provided at the front end of the inner cavity (2301) of the oil tank. A piston (250) is installed on the inner side of the inner cavity (2301) of the oil tank near the base plug (240). The piston (250) and the base plug (240) are connected by a spring (260).

8. The electro-hydraulic integrated actuator according to claim 6, characterized in that: The valve block (220) includes a valve block body (2200), and a threaded connector (2201) is provided at the front end of the valve block body (2200) and threadedly connected to the inner wall of the tail end of the oil tank body (2300). An oil inlet (2203) is provided on the end face of the threaded connector (2201) and communicates with the oil suction pipe (2302) on the side wall of the oil tank body. An oil outlet (2204) is provided on the end face of the valve block body (2200) and communicates with the oil tank oil delivery pipe (2304). The oil inlet (2203) and the oil outlet (2204) are respectively connected by a valve block oil delivery pipe (2207) provided on the valve block body (2200). An overflow pipe (2208) is also provided inside the valve block body (2200) and communicates with the inner cavity of the oil tank (2301).

9. The electro-hydraulic integrated actuator according to claim 8, characterized in that: A pressure sensor (2205) and a hydraulic connector (2206) are installed on the top surface of the valve block body (2200). 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) are installed on the front side of the valve block body (2200). A first relief valve (2209), a first check valve (2210), a second relief valve (2211), and a third hydraulically controlled check valve (2216) are installed on the rear side of the valve block body (2200). A hydraulically controlled check valve (2212); the output end of the pressure sensor (2205) is connected to the input end of the PLC controller, and the controlled ends of the first relief valve (2209), the first check valve (2210), the second relief valve (2211), the first hydraulically controlled check valve (2212), 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.

10. The electro-hydraulic integrated actuator according to claim 9, characterized in that: The inlet of the first check valve (2210) is connected to the inner cavity of the oil tank (2301), and 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. The second overflow valve (2211) is installed on the left overflow pipe (2208) that connects the left oil flow path to the inner cavity of the oil tank (2301). The left oil flow path consists of the left valve block oil supply pipe (2207) inside the valve block (220), the left oil tank oil supply pipe (2304), and the long oil pipe (1104) inside the hydraulic cylinder. The inlet of the second check valve (2213) is connected to the inner cavity of the oil tank (2301). The oil outlet of the bidirectional gear pump (2102) is connected to the right inlet of the bidirectional gear pump (2102), and the right outlet of the bidirectional gear pump (2102) is connected to the right oil flow path; the first overflow valve (2209) is set on the right high pressure overflow pipe (2208) connecting the right oil flow path and the inner cavity of the oil tank (2301), and the third overflow valve (2214) is set on the right low pressure overflow pipe (2208) connecting the right oil flow path and the inner cavity of the oil tank (2301); the right oil flow path consists of the right valve block oil supply pipe (2207), the right oil tank oil supply pipe (2304), and the short oil pipe (1105) inside the hydraulic cylinder, and the second hydraulic control check valve (2215) and the third hydraulic control check valve (2216) are set on the right oil flow path in sequence.

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