Multi-rotation electro-hydraulic actuator

Abstract

The utility model discloses a multi-rotation electro-hydraulic actuator which comprises a gear box, a secondary gear reducing mechanism, a hydraulic transmission mechanism, an electro-hydraulic power mechanism, a valve position indicator and a controller. The secondary gear reduction mechanism is installed in the gear box, the hydraulic transmission mechanism is installed on the gear box, an output gear shaft of the hydraulic transmission mechanism is coaxially connected with an input gear shaft of the secondary gear reduction mechanism, and the electro-hydraulic power mechanism is connected with the hydraulic transmission mechanism and used for supplying hydraulic oil to the hydraulic transmission mechanism. The valve position indicator is connected with an output gear shaft of the hydraulic transmission mechanism, and the controller is electrically connected with the valve position indicator and the electro-hydraulic power mechanism. According to the multi-rotation electro-hydraulic actuator, electric energy is converted into hydraulic energy through the electro-hydraulic power mechanism and output to the hydraulic transmission mechanism, the hydraulic energy is converted into mechanical energy through the hydraulic transmission mechanism and output to the second-stage gear reduction mechanism, and the second-stage gear reduction mechanism is driven to rotate. Therefore, the valve is driven to rotate to control opening and closing of the valve.

Description

Technical Field

[0001] The utility model relates to the technical field of actuators, in particular to a multi-rotation electro-hydraulic actuator. Background Art

[0002] An electro-hydraulic actuator is an actuator that uses electrical energy to convert into hydraulic energy to drive the movement of mechanical equipment. The electro-hydraulic actuator is mainly composed of an electric motor, a hydraulic pump, a hydraulic cylinder and an oil tank. The electric motor is responsible for providing electrical energy, the hydraulic pump converts electrical energy into hydraulic energy, the hydraulic cylinder stores and amplifies hydraulic energy to drive the piston rod to move, and the oil tank stores hydraulic oil and provides necessary lubrication and cooling. The working principle of the electro-hydraulic actuator is to use the power output by the servo motor, convert the power into hydraulic pressure through a high-precision gear pump, and then control the hydraulic pressure through a one-way valve to drive the piston rod to move. At present, the common electro-hydraulic actuators on the market are mainly angular strokes, with an output angle of 0°~90°. They are mainly used to control angular stroke valves such as ball valves, plug valves, butterfly valves and shutter valves. For linear stroke valves such as gate valves, stop valves, diaphragm valves, etc., multiple turns are required to open and close the valves, and the existing angular stroke electro-hydraulic actuators can no longer meet this demand. Utility Model Content

[0003] The utility model aims to provide a multi-rotation electro-hydraulic actuator suitable for opening and closing straight-stroke valves.

[0004] In order to achieve the above-mentioned purpose, the technical solution proposed by the utility model is:

[0005] A multi-turn electro-hydraulic actuator includes a gear box, a two-stage gear reduction mechanism installed in the gear box, a hydraulic transmission mechanism installed on the gear box, an electro-hydraulic power mechanism connected to the hydraulic transmission mechanism, a valve position indicator connected to the output gear shaft of the hydraulic transmission mechanism, and a controller electrically connected to the valve position indicator and the electro-hydraulic power mechanism. The output gear shaft of the hydraulic transmission mechanism is coaxially connected to the input gear shaft of the two-stage gear reduction mechanism, and the electro-hydraulic power mechanism is used to supply hydraulic oil to the hydraulic transmission mechanism.

[0006] Preferably, the two-stage gear reduction mechanism comprises an input gear shaft, a duplex gear shaft and a final gear shaft rotatably arranged in a gear box through a bearing. The duplex gear shaft comprises a coaxially connected large gear shaft and a small gear shaft, the gear radius of the small gear shaft is smaller than the gear radius of the input gear shaft, and the small gear shaft meshes with the input gear shaft. The gear radius of the final gear shaft is smaller than the gear radius of the large gear shaft, the final gear shaft is provided with a central shaft hole for assembling a valve stem, and the final gear shaft meshes with the large gear shaft.

[0007] Preferably, one end of the input gear shaft extends out of the gear box and is connected to the output gear shaft of the hydraulic transmission mechanism, the extended end of the input gear shaft is a non-circular cross-section shaft, and the output gear shaft is provided with a non-circular hole that is plugged into and fits with the non-circular cross-section shaft.

[0008] Preferably, the gearbox comprises a bottom shell, an upper cover and a transparent valve position window. The upper cover is sealably mounted on the bottom shell, and the input gear shaft, the duplex gear shaft and the terminal gear shaft are rotatably supported between the bottom shell and the upper cover through bearings. The upper cover is sealably mounted with a transparent valve position window at the terminal gear shaft, so that the valve stem can extend into the transparent valve position window.

[0009] Preferably, the central axis hole is a threaded hole threadedly connected to the valve stem.

[0010] Preferably, the hydraulic transmission mechanism comprises a base, an adapter plate, a first cylinder, a second cylinder, a rack and an output gear shaft. The base is connected to the gear box through the adapter plate, and the base is provided with a transverse mounting cavity and a vertical mounting cavity connected to the middle of the transverse mounting cavity. The first cylinder is connected to one end of the transverse mounting cavity, and the second cylinder is connected to the other end of the transverse mounting cavity. A rack is provided in the transverse mounting cavity, one end of the rack is slidably sealed in the first cylinder, and the other end of the rack is slidably fitted in the second cylinder. An output gear shaft meshing with the rack is rotatably provided in the vertical mounting cavity.

[0011] Preferably, sealing rings are provided between the adapter plate and the base, and between the adapter plate and the gear box.

[0012] Preferably, the first cylinder barrel and the second cylinder barrel are both threadedly connected to the base body, and sealing rings are provided between the first cylinder barrel, the second cylinder barrel and the base body.

[0013] Preferably, both ends of the rack are sleeved with wear-resistant rings and sealing rings for sliding and sealing cooperation with the corresponding first cylinder barrel and second cylinder barrel.

[0014] Preferably, a stepped hole is opened at the top of the vertical installation cavity, and an end cover is sealed in the stepped hole to limit the axial direction of the output gear shaft in the vertical installation cavity. The upper end sleeve of the output gear shaft is provided with a wear-resistant ring and a sealing ring that rotate with the end cover for sealing, and the lower end sleeve of the output gear shaft is provided with a wear-resistant ring, a sealing ring and a shaft sleeve that rotate with the base for sealing, and the output gear shaft extends upward from the end cover to be connected with the valve position indicator.

[0015] Preferably, an adjusting bolt is installed at one end of the first cylinder away from the base, and an adjusting nut and a cap nut are installed on the adjusting bolt.

[0016] Preferably, the electro-hydraulic power mechanism comprises an oil tank, a gear pump, an oil circuit and a control valve. The oil tank is connected to the oil inlet of the gear pump, the oil circuit is connected to the oil outlet of the gear pump, the first cylinder and the second cylinder respectively, and the control valve is installed in the oil circuit.

[0017] Preferably, the electro-hydraulic power mechanism further includes a hand pump connected to the oil tank and the oil circuit.

[0018] By adopting the above technical scheme, the beneficial effects of the utility model are as follows: the multi-rotation electro-hydraulic actuator of the utility model converts electrical energy into hydraulic energy through the electro-hydraulic power mechanism and outputs it to the hydraulic transmission mechanism, converts hydraulic energy into mechanical energy through the hydraulic transmission mechanism and outputs it to the secondary gear reduction mechanism, drives the secondary gear reduction mechanism to rotate, thereby driving the valve to rotate and control the valve to open and close, meeting the needs of opening and closing the straight-stroke valve through the electro-hydraulic actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the three-dimensional structure of the multi-rotation electro-hydraulic actuator of this embodiment.

[0020] Figure 2 for Figure 1 Schematic cross-sectional view of .

[0021] Figure 3 for Figure 1 Assembly diagram of the middle gearbox and secondary gear reduction mechanism.

[0022] Figure 4 for Figure 1 Schematic cross-sectional view of the hydraulic transmission mechanism.

[0023] Wherein: 1. gearbox, 11. bottom shell, 12. upper cover, 13. transparent valve position window, 2. two-stage gear reduction mechanism, 21. input gear shaft, 211. non-circular cross-section shaft, 22. double gear shaft, 221. large gear shaft, 222. small gear shaft, 23. terminal gear shaft, 3. hydraulic transmission mechanism, 31. base, 311. horizontal installation cavity, 312. vertical installation cavity, 32. adapter plate, 33. first cylinder, 34. second cylinder, 35. rack, 36. output gear shaft, 37. end cover, 38. adjusting bolt, 39. adjusting nut, 310. cap nut, 4. electro-hydraulic power mechanism, 5. valve position indicator, 6. valve stem. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0025] like Figure 1 to Figure 4As shown, the multi-turn electro-hydraulic actuator of this embodiment includes: a gear box 1, a two-stage gear reduction mechanism 2, a hydraulic transmission mechanism 3, an electro-hydraulic power mechanism 4, a valve position indicator 5 and a controller. Among them, the two-stage gear reduction mechanism 2 is installed in the gear box 1. The hydraulic transmission mechanism 3 is installed on the gear box 1, and the output gear shaft 36 of the hydraulic transmission mechanism 3 is coaxially connected with the input gear shaft 21 of the two-stage gear reduction mechanism 2, which is used to drive the two-stage gear reduction mechanism 2 to rotate. The electro-hydraulic power mechanism 4 is connected to the hydraulic transmission mechanism 3 to provide hydraulic pressure to the hydraulic transmission mechanism 3. The valve position indicator 5 is connected to the output gear shaft 36 of the hydraulic transmission mechanism 3 to feedback the opening and closing state of the valve. The controller is electrically connected to the valve position indicator 5 and the electro-hydraulic power mechanism 4 to receive the signal fed back by the valve position indicator 5, and to control the electro-hydraulic power mechanism 4 to provide a switch valve.

[0026] Specifically, the gearbox 1 of this embodiment includes: a bottom shell 11, an upper cover 12 and a transparent valve position window 13. The top of the bottom shell 11 is open, and the upper cover 12 is sealed and assembled on the open end of the bottom shell 11 by bolts and a sealing ring, and the transparent valve position window 13 is sealed and assembled on the top of the upper cover 12 by bolts and a sealing ring. The two-stage gear reduction mechanism 2 is guided and positioned between the bottom shell 11 and the upper cover 12. When there are different output speed requirements, the gear ratio can be replaced, and the overall appearance structure remains unchanged, and the requirements are diversified. The two-stage gear reduction mechanism 2 includes: an input gear shaft 21, a double gear shaft 22 and a terminal gear shaft 23. The input gear shaft 21, the double gear shaft 22 and the terminal gear shaft 23 are all rotatably supported between the bottom shell 11 and the upper cover 12 through bearings fixed at their two shaft ends. The input gear shaft 21 extends upward from the gearbox 1 and is connected to the output gear shaft 36 of the hydraulic transmission mechanism 3. In order to facilitate assembly, the extended end of the input gear shaft 21 is designed to be a non-circular cross-section shaft 211, preferably a square shaft. A non-circular hole is coaxially provided on the output gear shaft 36 to be plugged and matched with the non-circular cross-section shaft 211. When assembling, the non-circular hole can be directly aligned with the non-circular cross-section shaft 211 to insert the non-circular hole to achieve the coaxial fixation of the output gear shaft 36 and the input gear shaft 21. The double gear shaft 22 includes a large gear shaft 221 and a small gear shaft 222 that are coaxially connected. The gear radius of the small gear shaft 222 is smaller than the gear radius of the input gear shaft 21, and the gear radius of the large gear shaft 221 is larger than the gear radius of the small gear shaft 222 and larger than the gear radius of the terminal gear shaft 23. The terminal gear shaft 23 is arranged directly below the transparent valve position window 13. The terminal gear shaft 23 is provided with a central shaft hole for assembling the valve stem 6. The valve stem 6 is assembled in the central shaft hole and can extend upward into the transparent valve position window 13, so that the operator can intuitively understand the current position of the valve. The terminal gear shaft 23 is meshed with the large gear shaft 221, and the small gear shaft 222 is meshed with the input gear shaft 21. For rising stem valves, the central axis hole is designed as a threaded hole, the valve stem 6 is threadedly connected in the central axis hole, and the rotation of the end gear shaft 23 drives the valve stem 6 up and down. For concealed stem valves, the valve stem 6 is directly fixed in the central axis hole and rotates synchronously with the end gear shaft 23.

[0027] The hydraulic transmission mechanism 3 of this embodiment includes: a base 31, an adapter plate 32, a first cylinder 33, a second cylinder 34, a rack 35 and an output gear shaft 36. The base 31 is provided with a transverse mounting cavity 311 and a vertical mounting cavity 312 connected to the middle of the transverse mounting cavity 311. The base 31 is threadedly connected to the first cylinder 33 at the right end of the transverse mounting cavity 311, and the base 31 is threadedly connected to the second cylinder 34 at the left end of the transverse mounting cavity 311. The first cylinder 33, the transverse mounting cavity 311 and the second cylinder 34 are transversely connected. In order to improve the sealing performance, sealing rings are respectively provided at the connection between the first cylinder 33 and the base 31 and at the connection between the second cylinder 34 and the base 31. A rack 35 is installed in the transverse installation cavity 311. The left and right ends of the rack 35 are sleeved with wear-resistant rings and sealing rings. The right end of the rack 35 is slidably sealed and assembled in the first cylinder 33 through the wear-resistant ring and the sealing ring, and the left end of the rack 35 is slidably sealed and assembled in the second cylinder 34 through the wear-resistant ring and the sealing ring. In order to facilitate the assembly of the output gear shaft 36, the base 31 is provided with a step hole at the top of the vertical installation cavity 312, and the end cover 37 is sealed and assembled in the step hole. The output gear shaft 36 is axially limited and guided and installed in the vertical installation cavity 312 through the end cover 37, and the output gear shaft 36 extends upward from the end cover 37 to connect with the valve position indicator 5. The upper end of the output gear shaft 36 is sleeved with a wear-resistant ring and a sealing ring that rotate and seal with the end cover 37, and the lower end of the output gear shaft 36 is sleeved with a wear-resistant ring, a sealing ring and a sleeve that rotate and seal with the base 31. Wear-resistant rings, sealing rings, and sleeves can provide guidance and support for the rack 35 and the output gear shaft 36, and can prevent metal contact between moving parts. When hydraulic oil is input into the first cylinder 33 or the second cylinder 34, the rack 35 can be pushed to move left and right, and the rack 35 drives the output gear shaft 36 meshing therewith to rotate. After the basic assembly of the hydraulic transmission mechanism 3 is completed, sealing rings are installed on the upper and lower surfaces of the adapter plate 32 respectively, and then the adapter plate 32 is fixed to the bottom surface of the base 31 by bolts, and finally the adapter plate 32 is fixed to the gear box 1 by bolts, and the assembly can be easily completed. The setting of the adapter plate 32 makes disassembly and replacement more convenient.

[0028] In order to facilitate the adjustment of the opening and closing positions of the multi-turn electro-hydraulic actuator of this embodiment, an adjusting bolt 38 is installed at one end of the first cylinder 33 away from the base 31, and an adjusting nut 39 and a cap nut 310 are installed on the adjusting bolt 38 to fix the adjusted adjusting bolt 38 to prevent loosening and cause a deviation in the stroke angle. When the rack 35 moves to the end position of the first cylinder 33, the switch position of the valve is adjusted by the adjusting bolt 38, and the valve stem 6 connected to the end gear shaft 23 is observed through the transparent valve position window 13, which can clearly indicate the current position of the valve.

[0029] The electro-hydraulic power mechanism 4 of this embodiment includes: an oil tank, a gear pump, an oil circuit, a control valve and a hand pump. The oil tank is connected to the oil inlets of the gear pump and the hand pump respectively, and the oil circuit is connected to the oil outlet of the gear pump, the oil outlet of the hand pump, the first cylinder 33 and the second cylinder 34 respectively, and a control valve is installed on the oil circuit. The multi-turn electro-hydraulic actuator of this embodiment includes two control modes: manual control of the hand pump and automatic control of the controller. The gear pump is controlled by the controller or the hand pump is manually operated to push the hydraulic oil to the first cylinder 33, pushing the rack 35 to move into the second cylinder 34. During the movement, the rack 35 drives the output gear shaft 36 meshing with it to rotate, thereby outputting the corresponding torque value, and the output gear shaft 36 drives the secondary gear reduction mechanism 2 to rotate, thereby realizing the control of the valve stem 6 to open the valve. On the contrary, the valve closing control is the same as above. The valve position indicator 5 is connected to the output gear shaft 36. When the output gear shaft 36 rotates, the valve position indicator 5 is driven to rotate. After the output gear shaft 36 stops at the switch position, the valve position indicator 5 feeds back the open or closed position signal to the controller to control the gear pump to start or stop working.

[0030] The multi-turn electro-hydraulic actuator of this embodiment has a simple and compact structure and is easy to install and debug. It is suitable for opening and closing both linear-stroke valves and angular-stroke valves, and has higher universality.

[0031] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes in form and details of the present invention are within the scope of protection of the present invention without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A multi-turn electro-hydraulic actuator, characterized in that: include: Gear box (1); A two-stage gear reduction mechanism (2) installed in the gear box (1); A hydraulic transmission mechanism (3) is mounted on the gear box (1), wherein the output gear shaft (36) of the hydraulic transmission mechanism (3) is coaxially connected to the input gear shaft (21) of the secondary gear reduction mechanism (2); An electro-hydraulic power mechanism (4) connected to the hydraulic transmission mechanism (3) and used for supplying hydraulic oil to the hydraulic transmission mechanism (3); A valve position indicator (5) connected to the output gear shaft (36) of the hydraulic transmission mechanism (3); A controller is electrically connected to the valve position indicator (5) and the electro-hydraulic power mechanism (4).

2. The multi-turn electro-hydraulic actuator according to claim 1, characterized in that: The two-stage gear reduction mechanism (2) comprises: An input gear shaft (21) is rotatably disposed in the gear box (1) via a bearing; A double gear shaft (22) is rotatably disposed in the gear box (1) via a bearing, the double gear shaft (22) comprising a large gear shaft (221) and a small gear shaft (222) coaxially connected, the gear radius of the small gear shaft (222) being smaller than the gear radius of the input gear shaft (21), and the small gear shaft (222) meshes with the input gear shaft (21); The end gear shaft (23) is rotatably arranged in the gear box (1) via a bearing, the gear radius of the end gear shaft (23) is smaller than the gear radius of the large gear shaft (221), the end gear shaft (23) is provided with a central axis hole for assembling the valve stem (6), and the end gear shaft (23) is meshed with the large gear shaft (221).

3. The multi-turn electro-hydraulic actuator according to claim 2, characterized in that: One end of the input gear shaft (21) extends out of the gear box (1) and is connected to the output gear shaft (36) of the hydraulic transmission mechanism (3); the extended end of the input gear shaft (21) is a non-circular cross-section shaft (211); and the output gear shaft (36) is provided with a non-circular hole for plugging and matching with the non-circular cross-section shaft (211).

4. The multi-turn electro-hydraulic actuator according to claim 2, characterized in that: The gear box (1) comprises: a bottom shell (11), an upper cover (12) and a transparent valve position window (13); the upper cover (12) is sealingly mounted on the bottom shell (11); the input gear shaft (21), the double gear shaft (22) and the end gear shaft (23) are rotatably supported between the bottom shell (11) and the upper cover (12) via bearings; the upper cover (12) is sealingly mounted with a transparent valve position window (13) at the end gear shaft (23) so that the valve stem (6) can extend into the transparent valve position window (13).

5. The multi-turn electro-hydraulic actuator according to claim 2, characterized in that: The central axis hole is a threaded hole threadedly connected to the valve stem (6).

6. The multi-turn electro-hydraulic actuator according to claim 1, characterized in that: The hydraulic transmission mechanism (3) comprises: a base (31), an adapter plate (32), a first cylinder (33), a second cylinder (34), a rack (35) and an output gear shaft (36); The base (31) is connected to the gear box (1) via an adapter plate (32); the base (31) is provided with a transverse mounting cavity (311) and a vertical mounting cavity (312) connected to the middle of the transverse mounting cavity (311); the first cylinder (33) is connected to one end of the transverse mounting cavity (311), and the second cylinder (34) is connected to the other end of the transverse mounting cavity (311); a rack (35) is provided in the transverse mounting cavity (311); one end of the rack (35) is slidably sealed in the first cylinder (33), and the other end of the rack (35) is slidably fitted in the second cylinder (34); an output gear shaft (36) is rotatably provided in the vertical mounting cavity (312) and meshes with the rack (35).

7. The multi-turn electro-hydraulic actuator according to claim 6, characterized in that: Sealing rings are provided between the adapter plate (32) and the base body (31), and between the adapter plate (32) and the gear box (1); The first cylinder (33) and the second cylinder (34) are both threadedly connected to the base (31), and sealing rings are provided between the first cylinder (33) and the second cylinder (34) and the base (31); Both ends of the rack (35) are sleeved with wear-resistant rings and sealing rings for sliding and sealing cooperation with the corresponding first cylinder (33) and second cylinder (34); The base (31) is provided with a stepped hole at the top of the vertical installation cavity (312); an end cover (37) is sealably mounted in the stepped hole for limiting the axial direction of the output gear shaft (36) in the vertical installation cavity (312); the upper end of the output gear shaft (36) is sleeved with a wear-resistant ring and a sealing ring that are rotationally sealed with the end cover (37); the lower end of the output gear shaft (36) is sleeved with a wear-resistant ring, a sealing ring and a shaft sleeve that are rotationally sealed with the base (31); the output gear shaft (36) extends upward from the end cover (37) to be connected to the valve position indicator (5).

8. The multi-turn electro-hydraulic actuator according to claim 6, characterized in that: An adjusting bolt (38) is mounted on one end of the first cylinder (33) away from the base (31), and an adjusting nut (39) and a cap nut (310) are mounted on the adjusting bolt (38).

9. The multi-turn electro-hydraulic actuator according to claim 1, characterized in that: The electro-hydraulic power mechanism (4) comprises: an oil tank, a gear pump, an oil circuit and a control valve; The oil tank is connected to the oil inlet of the gear pump, the oil circuit is connected to the oil outlet of the gear pump, the first cylinder (33) and the second cylinder (34) respectively, and the control valve is installed on the oil circuit.

10. The multi-turn electro-hydraulic actuator according to claim 9, characterized in that: It also includes a hand pump connected with the oil tank and the oil circuit.

Images