CN112065819A

CN112065819A - Compact electro-hydraulic actuator

Info

Publication number: CN112065819A
Application number: CN202011075477.8A
Authority: CN
Inventors: 赵海; 邵婷婷; 周洪俊; 杨铁山
Original assignee: Kunshan Haixin Electromechanical Technology Co ltd
Current assignee: Kunshan Haixin Electromechanical Technology Co ltd
Priority date: 2020-10-10
Filing date: 2020-10-10
Publication date: 2020-12-11

Abstract

The invention discloses a compact electro-hydraulic actuator, which comprises: the hydraulic control valve comprises an electro-hydraulic power assembly, a hydraulic actuator and a hydraulic connecting block, wherein the electro-hydraulic power assembly comprises a motor, a valve block and an oil tank, the valve block is arranged between the motor and the oil tank, the hydraulic connecting block is arranged between the side face of the valve block and the hydraulic actuator, an oil suction hole is arranged on the front face of the valve block, an oil distribution shaft is arranged in the valve block, a bearing eccentric to the oil distribution shaft is arranged on the back face of the valve block, a plunger cylinder body located in the bearing is rotatably arranged on the oil distribution shaft, first oil inlet and outlet grooves located in the plunger cylinder body are arranged on the two sides of the front portion of the oil distribution shaft, and second oil inlet and outlet grooves in one-to-one correspondence with the first oil. Through the mode, the compact electro-hydraulic actuator disclosed by the invention realizes the compactness of the structure and the output of large torque, ensures the operation under partial faults, and improves the action stroke and the stability.

Description

Compact electro-hydraulic actuator

Technical Field

The invention relates to the technical field of actuators, in particular to a compact electro-hydraulic actuator.

Background

The hydraulic actuating mechanism is an actuating mechanism driven by hydraulic power, is mainly used for controlling the valve and realizes the opening and closing of the valve.

The existing hydraulic actuator usually adopts a hydraulic cylinder to perform the action of an actuating component, and the hydraulic cylinder needs a hydraulic pump to provide power. The existing hydraulic pump has large volume, and the reciprocating action of a hydraulic cylinder is difficult to realize through the hydraulic pump, so a plurality of valves are required to be equipped for switching, and the complexity and the unstable factors of the system are further increased.

In the actual use process of the actuator, the electric hydraulic pump needs the motor to drive, and under the condition of motor failure or power failure, the electric hydraulic pump cannot normally work, so that the hydraulic actuator cannot normally act, and the opening and closing operation of the valve is influenced.

In addition, the hydraulic cylinder and the executing component mostly adopt split structures, the volume is large, the space requirements on installation and action are large, and the application range is limited. The pipeline is not well planned by the structure of integrating part of the hydraulic cylinder and the execution part, the action stroke of the hydraulic cylinder is short, the action of the execution part is not in place, and even the execution part is blocked after moving to the extreme, so that improvement is needed.

Disclosure of Invention

The invention mainly solves the technical problem of providing a compact electro-hydraulic actuator, which realizes the compactness of the volume, ensures larger output torque, and improves the operation stability and the maintenance convenience.

In order to solve the technical problems, the invention adopts a technical scheme that: providing a compact electro-hydraulic actuator comprising: the hydraulic control system comprises an electro-hydraulic power component, a hydraulic actuator and a hydraulic connecting block, wherein the electro-hydraulic power component comprises a motor, a valve block and an oil tank, the valve block is arranged between the motor and the oil tank, the hydraulic connecting block is arranged between the side surface of the valve block and the hydraulic actuating mechanism, the front of the valve block is provided with an oil suction hole, the valve block is internally provided with an oil distribution shaft, the back of the valve block is provided with a bearing eccentric to the oil distribution shaft, the oil distribution shaft is rotatably provided with a plunger cylinder body positioned in the bearing, two sides of the front part of the oil distribution shaft are provided with a first oil inlet and outlet groove positioned in the plunger cylinder body, two sides of the rear part of the oil distribution shaft are provided with second oil inlet and outlet grooves which are in one-to-one correspondence with the first oil inlet and outlet grooves, the plunger piston is characterized in that a plurality of plunger piston holes are radially formed in the plunger piston cylinder body, plungers are respectively arranged in the plunger piston holes, and a transmission sleeve for driving the plunger piston cylinder body to rotate is arranged on a rotating shaft of the motor.

In a preferred embodiment of the invention, the electrohydraulic power assembly further comprises an oil compensating valve core and a first hydraulic lock, a first mounting hole corresponding to the oil compensating valve core is arranged in the valve block, the oil compensating valve core is arranged in the first mounting hole, two first undercurrent holes respectively communicating a corresponding second oil inlet and outlet groove and the first mounting hole are arranged in the valve block, the intersection points of the first undercurrent holes and the first mounting hole respectively correspond to the two ends of the oil compensating valve core, a second mounting hole corresponding to the first hydraulic lock is arranged in the valve block, the first hydraulic lock is arranged in the second mounting hole, second undercurrent holes extending into the second mounting hole are respectively arranged in the first undercurrent holes, the opening positions of the second undercurrent holes in the second mounting hole respectively correspond to the two ends of a piston mandril of the first hydraulic lock, a first oil inlet and outlet hole and a second oil inlet and outlet hole penetrating through the second mounting hole are arranged on the side surface of the valve block, the intersection points of the first oil inlet and outlet hole, the second oil inlet and outlet hole and the second mounting hole respectively correspond to the positions of two first hydraulic lock valve seats of the first hydraulic lock, and a third undercurrent hole for communicating the oil suction hole and the first mounting hole is arranged in the valve block.

In a preferred embodiment of the present invention, an oil suction pipe extending into the oil tank is disposed on the oil suction hole, a gravity oil suction ball is disposed at a terminal of the oil suction pipe, a support spring located between the gravity oil suction ball and the valve block is sleeved on the oil suction pipe, and a fourth underflow hole communicating the corresponding first oil inlet/outlet groove and the corresponding second oil inlet/outlet groove is disposed in the oil distribution shaft.

In a preferred embodiment of the invention, the transmission sleeve is provided with a plurality of blind holes in an annular array, the front surface of the plunger cylinder body is provided with a transmission column extending into at least one of the blind holes, the transmission column is provided with a limiting spring extending to the bottom end of the blind hole, the first mounting hole comprises a guide hole and a blocking hole, the blocking holes are arranged at two ends of the guide hole, the diameter size of the blocking hole is respectively larger than that of the guide hole to form a stepped hole, the third undercurrent hole is communicated with the guide hole, the oil supplementing valve core comprises a first valve core head and a second valve core head, the first valve core head and the second valve core head are respectively arranged in the corresponding blocking holes, the first valve core head is provided with a valve core rod in threaded connection with the second valve core head, the valve core rod is provided with a tensioning spring, and the valve core rod and the tensioning spring are positioned in the guide hole, the diameter size of the first valve core head and the diameter size of the second valve core head are larger than that of the guide hole, two overflow valve mounting holes which are respectively communicated with the corresponding first down-the-hole are formed in the side face of the valve block, an overflow valve is arranged in each overflow valve mounting hole, and an oil return hole communicated with an oil tank is formed in each overflow valve mounting hole.

In a preferred embodiment of the present invention, the hydraulic connection block includes a block body, a second hydraulic lock, a first through joint and a second through joint, the block body has a top surface provided with an oil outlet and an oil return hole extending downward at an interval, a bottom surface provided with an oil inlet and an oil outlet extending upward at an interval, a left side surface provided with a first process hole passing through the oil inlet, a rear end surface provided with a second process hole intersecting the first process hole and passing through the oil outlet, a front end surface provided with a third process hole passing through the oil return hole, a right side surface provided with a fourth process hole intersecting the third process hole and passing through the oil outlet, the block body has a second hydraulic lock mounting hole passing through the oil inlet and the oil outlet, the second hydraulic lock is disposed in the second hydraulic lock mounting hole, and the second hydraulic lock includes a first check valve and a second check valve disposed opposite to each other, and a movable joint disposed between the first check valve and the second check valve The plug type ejector rod is characterized in that a fifth process hole extending to one side of the front end of the first one-way valve is formed in the left side of the block body, the first through connector is directly or indirectly communicated with the fifth process hole, a sixth process hole passing through the front end of the second one-way valve is formed in the right side of the block body, and the second through connector is directly or indirectly communicated with the sixth process hole.

In a preferred embodiment of the present invention, two ends of the piston type ram respectively extend to ends of the first check valve and the second check valve, the second hydraulic lock mounting hole is located below the third fabrication hole, a bypass plug screw mounting hole extending to the fourth fabrication hole and pointing to the first fabrication hole is arranged on a front end face of the block, a seventh fabrication hole extending to the first fabrication hole is arranged at a tail end of the bypass plug screw mounting hole, a bypass plug screw is arranged in the bypass plug screw mounting hole to plug the seventh fabrication hole, the first check valve corresponds to a position of the oil inlet hole, and the second check valve corresponds to a position of the oil outlet hole.

In a preferred embodiment of the present invention, the front end face of the block body is provided with an eighth fabrication hole extending to the fifth fabrication hole, the front end of the left side of the block body is provided with a ninth fabrication hole communicating with the eighth fabrication hole, the first through joint is installed at an end of the ninth fabrication hole, the front end face of the block body is provided with a tenth fabrication hole extending to the sixth fabrication hole, the second through joint is installed at an end of the tenth fabrication hole, the first fabrication hole, the second fabrication hole, the third fabrication hole, the fourth fabrication hole, the fifth fabrication hole, the sixth fabrication hole and the eighth fabrication hole are provided with ball-expansion plugs for plugging, and the block body is provided with a plurality of installation holes.

In a preferred embodiment of the invention, the hydraulic actuator comprises a cylinder, a piston and a driving rod, the driving rod is vertically arranged in the cylinder and extends to the outer side of the cylinder, a through hole perpendicular to the driving rod is transversely arranged in the cylinder, the piston is concentrically arranged in the through hole, one side of the piston is provided with a flat-bottom groove corresponding to the driving rod, a circle of gear teeth corresponding to the flat-bottom groove is arranged on the excircle of the driving rod, a rack meshed with the gear teeth or a plurality of transversely spaced strip-shaped teeth are arranged in the flat-bottom groove, two ends of the cylinder are provided with sealing covers positioned at two ends of the through hole, an adjusting screw plug pointing to the corresponding end part of the piston is arranged in each sealing cover, one side of the cylinder is provided with a liquid inlet hole and a liquid outlet hole, a fifth underflow hole for communicating the liquid inlet hole with the front part of the through hole and a sixth underflow hole, openings of the fifth underflow hole and the sixth underflow hole in the through hole are located at the tail ends of the corresponding blocking covers, and guide grooves are respectively arranged at the two ends of the piston in an inwards concave mode.

In a preferred embodiment of the present invention, the outer end of the adjusting screw plug is provided with a first hexagon socket wrench hole, one side of the blocking cover is provided with a fastening screw pointing to the adjusting screw plug, the top of the driving rod is provided with a square column, the piston is of a cylindrical structure, and the piston is provided with sealing rings positioned on two sides of the flat bottom groove.

In a preferred embodiment of the present invention, a driving rod installation hole corresponding to the driving rod is vertically arranged in the cylinder body, one side of the driving rod installation hole is partially in cross communication with the through hole, a top cover concentric with the driving rod is arranged at the top of the driving rod installation hole, the driving rod penetrates through the top cover and extends to the upper side of the top cover, a first gasket positioned between the gear teeth and the top cover is arranged on the driving rod, a bottom cover concentric with the driving rod is arranged at the bottom of the driving rod installation hole, a second gasket positioned between the gear teeth and the bottom cover is arranged on the driving rod, the lower portion of the driving rod extends into the bottom cover, and a second hexagon socket wrench hole is arranged at.

The invention has the beneficial effects that: the compact electro-hydraulic actuator disclosed by the invention has the advantages that the electro-hydraulic power assembly is connected with the hydraulic actuating mechanism through the hydraulic connecting block, the structure is compact, the hydraulic connecting block can be switched between electric operation and manual operation, the operation under partial faults is ensured, the action stroke and the stability are improved through the hydraulic actuating mechanism, the output of large torque is ensured, larger opening torque can be provided for a large-caliber valve, and the application range is wide.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

FIG. 1 is a schematic diagram of a preferred embodiment of a compact electro-hydraulic actuator according to the present invention;

FIG. 2 is a schematic diagram of the electro-hydraulic power module of FIG. 1;

FIG. 3 is a perspective view of FIG. 2;

FIG. 4 is a schematic structural view of the valve block of FIG. 2;

FIG. 5 is a bottom view of FIG. 4;

FIG. 6 is a sectional view taken along line A-A of FIG. 5;

FIG. 7 is a sectional view taken along line B-B of FIG. 5;

FIG. 8 is a cross-sectional view taken along line C-C of FIG. 4;

FIG. 9 is a cross-sectional view taken along line D-D of FIG. 5;

FIG. 10 is a schematic structural view of the oil distributing shaft of FIG. 9;

FIG. 11 is a schematic structural view of the oil refill cartridge of FIG. 7;

FIG. 12 is a schematic diagram of the hydraulic connector block of FIG. 1;

FIG. 13 is a sectional view taken along line G-G of FIG. 12;

FIG. 14 is a sectional view taken along line H-H of FIG. 12;

FIG. 15 is a perspective view of FIG. 12;

FIG. 16 is a view of the bottom surface of FIG. 13 after being turned 180 degrees;

FIG. 17 is a schematic view of the block of FIG. 14 in isolation;

FIG. 18 is a schematic view of the hydraulic actuator of FIG. 1;

FIG. 19 is a perspective view of FIG. 18;

FIG. 20 is a sectional view taken along line F-F of FIG. 18;

fig. 21 is a sectional view taken along line E-E of fig. 18.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, an embodiment of the present invention includes:

the compact electro-hydraulic actuator shown in fig. 1 comprises: electro-hydraulic power component 1, actuating mechanism 3 and hydraulic pressure connecting block 2, as shown in fig. 2, electro-hydraulic power component 1 includes motor 12, valve block 11 and oil tank 15, and valve block 11 sets up between motor 12 and oil tank 15, can connect fixedly through the screw, and it is convenient to dismantle. The hydraulic connecting block 2 is arranged between the side face of the valve block 11 and the hydraulic actuating mechanism 3 and is fixed through bolts, so that the structure is compact.

As shown in fig. 4 to 9, an oil suction hole 119 is formed in the front surface of the valve block 11, an oil suction pipe 14 extending into the oil tank 15 is disposed on the oil suction hole 119, a gravity oil suction ball 16 is disposed at the end of the oil suction pipe 14, and the gravity oil suction ball 16 enables the oil suction pipe 14 to suck hydraulic oil at the bottom of the oil tank 15 after being bent, in this embodiment, a support spring 17 located between the gravity oil suction ball 16 and the valve block 11 is sleeved on the oil suction pipe 14, so as to ensure the curvature of the oil suction pipe 14 when being bent, and avoid the problem of blockage due to excessive bending.

An oil distribution shaft 111 is arranged in the valve block 11, and in the embodiment, the oil distribution shaft 111 extends from the front surface of the valve block 11 to the back surface of the valve block 11 and is limited by a clamp spring, so that the valve block is convenient to assemble and disassemble. As shown in fig. 6, a bearing 1132 eccentric to the oil distribution shaft 111 is disposed on the back of the valve block 11, a plunger cylinder 113 disposed in the bearing 1132 is rotatably disposed on the oil distribution shaft 111, 5 to 6 plunger holes are radially disposed in the plunger cylinder 113, plungers 1131 are disposed in the plunger holes, respectively, the plungers 1131 reciprocate by rotation of the plunger cylinder 113, and pump oil by cooperating with the bearing 1132 eccentric to the plunger cylinder 113.

As shown in fig. 10, first oil inlet and outlet grooves 1113 located in the plunger cylinder 113 are arranged on two sides of the front part of the oil distribution shaft 111, second oil inlet and outlet grooves corresponding to the first oil inlet and outlet grooves 1113 one by one are arranged on two sides of the rear part of the oil distribution shaft 111, and fourth underflow holes 1112 communicating the corresponding first oil inlet and outlet grooves 1113 and the second oil inlet and outlet grooves 1111 are arranged in the oil distribution shaft 111 to form a bidirectional oil path.

In this embodiment, a rotating shaft of the motor 12 is provided with a transmission sleeve 112 for driving the plunger cylinder 113 to rotate, as shown in fig. 9, a plurality of blind holes 1121 are formed in the transmission sleeve 112 in an annular array for weight reduction and dynamic balance, a transmission column 1123 extending into at least one of the blind holes 1121 is arranged on the front surface of the plunger cylinder 113 for transmission, and a limit spring 1122 extending to the bottom end of the blind hole 1121 is arranged on the transmission column 1123 for ensuring the axial stability of the plunger cylinder 113 and the transmission sleeve 112.

In this embodiment, a first mounting hole 1191 corresponding to the oil compensation valve core 116 is disposed in the valve block 11, the oil compensation valve core 116 is disposed in the first mounting hole 1191, two first undercurrent holes 1193 respectively communicating the second oil inlet/outlet tank 1111 and the first mounting hole 1191 are disposed in the valve block 11, and the junction points of the first undercurrent holes 1193 and the first mounting hole 1191 respectively correspond to the positions of the two ends of the oil compensation valve core 116, so as to facilitate the movement of the oil compensation valve core 116.

The valve block 11 is provided with a third down-the-flow hole 1191 for communicating the oil suction hole 119 with the first mounting hole 1191, in this embodiment, the first mounting hole 1191 includes a guiding hole and blocking holes, the blocking holes are disposed at two ends of the guiding hole, and the diameter of the blocking holes are respectively larger than that of the guiding hole to form a stepped hole, and the third down-the-flow hole 1191 is communicated with the guiding hole to supply oil to the guiding hole.

As shown in fig. 11, the oil compensating valve core 116 includes a first valve core head 1161 and a second valve core head 1162, the first valve core head 1161 and the second valve core head 1162 are respectively disposed in the corresponding blocking holes, a valve core rod 1163 threadedly connected to the second valve core head 1162 is disposed on the first valve core head 1161, and in this embodiment, a tension spring 1164 is disposed on the valve core rod 1163 to prevent the second valve core head 1162 from being loosened. The valve core rod 1163 and the tensioning spring 1164 are located in the guide hole, and installation is convenient.

The diameter sizes of the first valve core head 1161 and the second valve core head 1162 are larger than that of the guide hole, and one end of the guide hole is closed and the other end of the guide hole is opened through the matching of the first valve core head 1161 and the second valve core head 1162 with the guide hole. For example, when the plunger cylinder 113 moves, a suction force is generated, so that the oil compensating valve core 116 moves forward toward the first underflow hole on one side, and a passage between the guide hole and the first underflow hole is opened, oil in the guide hole is guided into the plunger cylinder 113, and then flows out through the first underflow hole on the other side, so as to form a loop, when the plunger cylinder 113 runs in a reverse direction, oil paths in the first underflow holes on both sides are also reversed, that is, by controlling the rotation direction of the motor, the oil paths can be reversed, and the flexibility is good.

In this embodiment, a second mounting hole corresponding to the first hydraulic lock 115 is formed in the valve block 11, the first hydraulic lock 115 is disposed in the second mounting hole, second down-the-flow holes 1192 extending into the second mounting hole are respectively formed in the first down-the-flow holes 1193, and the opening positions of the second down-the-flow holes 1192 in the second mounting hole respectively correspond to the positions of the two ends of the piston rod of the first hydraulic lock 115, so that oil can be conveniently supplied through the second down-the-flow holes 1192, and the first hydraulic lock 115 can be opened.

As shown in fig. 6, a first oil inlet and outlet hole 117 and a second oil inlet and outlet hole 118 penetrating through the second mounting hole are formed in the side surface of the valve block 11, the intersection points of the first oil inlet and outlet hole 117 and the second oil inlet and outlet hole 118 and the second mounting hole respectively correspond to the positions of two first hydraulic lock valve seats of the first hydraulic lock 115, and the first oil inlet and outlet hole 117 and the second oil inlet and outlet hole 118 can be opened after the first hydraulic lock 115 is opened, so that the self-locking effect is good. In this embodiment, two pressure sensors 13 are disposed on the side of the valve block 11 and respectively communicate with the first oil inlet and outlet hole 117 and the second oil inlet and outlet hole 118 to detect the pressure of the oil path, and the first oil inlet and outlet hole 117 and the second oil inlet and outlet hole 118 are respectively connected to the hydraulic connecting block 2 to form a loop.

Two overflow valve mounting holes respectively communicated with the corresponding first down-the-hole 1193 are formed in the side face of the valve block 11, as shown in fig. 7, an overflow valve 114 is arranged in each overflow valve mounting hole, an oil return hole communicated with an oil tank is formed in each overflow valve mounting hole, oil return is performed, and stability of oil supply pressure is controlled.

The hydraulic connecting block shown in fig. 12 to 15 comprises: the block body 21, the second hydraulic lock 29, the first straight joint 26 and the second straight joint 25, the block body 21 is provided with 4 mounting holes 213 in a rectangular array, and the block body 21 is conveniently fixed between the electro-hydraulic power assembly and the hydraulic actuator. The block 21 top surface interval is provided with downwardly extending's oil outlet 23 and oil return hole 22, conveniently is connected with the actuating mechanism that surges, and the block 21 bottom surface interval is provided with the inlet port 28 and the oil drain 27 that upwards extend, conveniently is connected with the first business turn over oilhole 117 and the second business turn over oilhole 118 of electric hydraulic power component, is favorable to forming hydraulic circuit.

As shown in fig. 13, the left side surface of the block body 21 is provided with a first process hole 219 passing through the oil inlet hole 28, and the electro-hydraulic power assembly introduces hydraulic oil into the first process hole 219 through the oil inlet hole 28. The rear end face of the block body 21 is provided with a second process hole 218 intersecting the first process hole 219 and passing through the oil outlet hole 23, and hydraulic oil is introduced into the hydraulic actuator 3 through the oil outlet hole 23 to perform the operation of the hydraulic actuator 3.

The front end face of the block body 21 is provided with a third process hole 221 which is communicated with the oil return hole 22, so that return oil of the hydraulic actuator enters the third process hole 221. The right side surface of the block body 21 is provided with a fourth process hole 211 which intersects with the third process hole 221 and passes through the oil discharge hole 27, and the hydraulic oil entering the fourth process hole 211 returns to the electro-hydraulic power assembly through the oil discharge hole 27 to form a hydraulic circuit in one direction, and vice versa.

In this embodiment, as shown in fig. 17, a second hydraulic lock mounting hole 222 passing through the oil inlet 28 and the oil outlet 27 is provided in the block 21, and the second hydraulic lock mounting hole 222 is located below the third process hole 221, as shown in fig. 14, the second hydraulic lock 29 is provided in the second hydraulic lock mounting hole 222, the second hydraulic lock 29 includes a first check valve 291 and a second check valve 292 which are oppositely provided, and a piston ram 293 located between the first check valve 291 and the second check valve 292, two ends of the piston ram 293 extend to ends of the first check valve 291 and the second check valve 292 respectively, after hydraulic oil is introduced into one end of the piston ram 293, the hydraulic oil triggers a steel ball in the first check valve 291 or the second check valve 292, and drives the piston ram 293 to advance, and simultaneously opens the other first check valve 291 or the second check valve 292.

The block body 21 is provided at the left side thereof with a fifth tooling hole 214 extending to the front side of the first check valve 291, the first through joint 26 is in direct or indirect communication with the fifth tooling hole 214, in this embodiment, the front end face of the block body 21 is provided with an eighth fabrication hole 215 extending to the fifth fabrication hole 214, the front end of the left side of the block body 21 is provided with a ninth fabrication hole 217 communicating with the eighth fabrication hole 215, the first through joint 26 is installed at the end of the ninth fabrication hole 217, the right side of the block body 21 is provided with a sixth fabrication hole 212 passing through the front end of the second check valve 292, the second through joint 25 is directly or indirectly communicated with the sixth fabrication hole 212, in this embodiment, a tenth fabrication hole 216 extending to the sixth fabrication hole 212 is formed in the front end surface of the block 21, and the second through connector 25 is installed at an end of the tenth fabrication hole 216, so as to facilitate connection between the first through connector 26 and the second through connector 25 and two ports of the manual hydraulic pump.

When the electro-hydraulic power assembly fails, as shown in fig. 14, hydraulic oil is introduced into the ninth process hole 217 and finally enters the fifth process hole 214 by the manual hydraulic pump, at this time, the hydraulic oil drives the piston-type ejector 293 and the steel balls in the first check valve 291 to retreat and open the first check valve 291 and the second check valve 292, as shown in fig. 17, the first check valve 291 corresponds to the oil inlet 28, so that the hydraulic oil entering the first check valve 291 enters the oil inlet 28, as shown in fig. 13, enters the oil outlet 23, the hydraulic oil is introduced into the hydraulic actuator through the oil outlet 23, the hydraulic actuator is operated, return oil of the hydraulic actuator enters the oil return hole 22 and then enters the oil discharge hole 27, the second check valve 292 corresponds to the oil discharge hole 27, at this time, the second check valve 292 is kept open, so that the hydraulic oil in the oil discharge hole 27 enters the sixth process hole 212, finally, the hydraulic pump returns to the manual hydraulic pump through the second straight joint 25, the operation is simple and convenient, and the operation flexibility of the electro-hydraulic power assembly in the case of failure is improved.

When the manual hydraulic pump also breaks down, a pure manual wrench is needed to screw the driving rod on the hydraulic actuating mechanism to open or close the valve, but at the moment, the hydraulic loop is not communicated and the driving rod cannot be screwed. Therefore, a bypass plug mounting hole 223 extending to the fourth fabrication hole 211 and pointing to the first fabrication hole 219 needs to be further provided on the front end surface of the block 21, a seventh fabrication hole 220 extending to the first fabrication hole 219 is provided at the end of the bypass plug mounting hole 223, a bypass plug 24 is provided in the bypass plug mounting hole 223 to plug the seventh fabrication hole 220, the bypass plug 24 is unscrewed, as shown in fig. 13, the oil outlet 23 and the oil return hole 22 are communicated, i.e., the pressure can be relieved, and a wrench is used to screw the driving rod.

In this embodiment, ball expansion plugs are disposed at the ends of the first process hole 219, the second process hole 218, the third process hole 221, the fourth process hole 211, the fifth process hole 214, the sixth process hole 212, and the eighth process hole 215 for plugging, so that the processing is convenient, and the leakage problem is avoided.

The hydraulic actuator 3 shown in fig. 18 and 20 includes: cylinder body 38, piston 36 and actuating lever 34, actuating lever 34 vertical setting in cylinder body 38 and extend to the outside of cylinder body 38, and the actuating lever 34 top is provided with square column 342, conveniently carries out the connection drive of valve, and through the rotation of actuating lever 34, the realization valve is opened and is closed.

A through hole 381 perpendicular to the driving rod 34 is transversely arranged in the cylinder 38, and the piston 36 is concentrically arranged in the through hole 381, in this embodiment, the piston 36 is a cylindrical structure and can reciprocate in the through hole 381 to perform piston motion. A driving rod mounting hole 382 corresponding to the driving rod 34 is vertically arranged in the cylinder body 38, and a part of one side of the driving rod mounting hole 382 is vertically and crosswise communicated with the through hole 381, so that the driving of the driving rod 34 is facilitated.

A flat-bottom groove 361 corresponding to the driving rod 34 is formed in one side of the piston 36, and sealing rings 364 are arranged on two sides of the flat-bottom groove 361 on the piston 36 to prevent hydraulic oil from entering the flat-bottom groove 361. Be provided with the round teeth of a cogwheel 341 that correspond with flat bottom groove 361 position on the actuating lever 34 excircle, be provided with in the flat bottom groove 361 with the rack of teeth of a cogwheel 341 meshing or several horizontal spaced bar teeth 362, can adopt two kinds of schemes of rack and rack, the rack need adopt the fix with screw in flat bottom groove 361, but it is more convenient to maintain the change, and is with low costs, and bar teeth 362 and flat bottom groove 361 integration processing come out, as shown in fig. 21, stable in structure, but difficult to maintain, the change cost is high.

The two ends of the cylinder body 38 are provided with the plugging covers 35 located at the two ends of the through hole 381, and the plugging covers 35 are fixed through bolts, so that the cylinder is convenient to disassemble and assemble. Be provided with the regulation plug screw 351 of the corresponding tip of directional piston 36 in the shutoff lid 35, adjust the plug screw 351 outer end and be provided with first allen key hole 352, make things convenient for the spanner to twist reverse, realize adjusting plug screw 351's radial movement, can carry on spacingly to the tip of piston 36, adjust the stroke. The fastening screw 353 pointing to the adjusting screw plug 351 is arranged on one side of the blocking cover 35, so that the fastening after the adjusting screw plug 351 is adjusted is realized, and the loosening is avoided.

As shown in fig. 20, a bottom cover 33 concentric with the driving rod 34 is disposed at the bottom of the driving rod mounting hole 382, and the bottom cover 33 can be fixed at the bottom of the driving rod mounting hole 382 by a screw thread manner, so that the assembly and disassembly are convenient. The driving rod 34 is provided with a second spacer 345 between the gear teeth 341 and the bottom cover 33 to support the rotation of the gear teeth 341. In the present embodiment, the lower portion of the driving rod 34 extends into the bottom cover 33, and the bottom cover 33 is provided with a guide hole corresponding to the driving rod 34, so as to guide the rotation of the driving rod 34 and expose the bottom of the driving rod 34. The bottom end of the driving rod 34 is provided with a second hexagon socket wrench hole 343, which facilitates the rotation of the driving rod 34 by a wrench and the manual adjustment of the angle of the driving rod 34.

In addition, a top cover 37 concentric with the driving rod 34 is arranged at the top of the driving rod installation hole 382, the top cover 37 is fixed by screws, the structure is stable, the driving rod 34 penetrates through the top cover 37 and extends to the upper side of the top cover 37, and a first gasket 344 located between the gear teeth 341 and the top cover 37 is arranged on the driving rod 34 to axially limit the gear teeth 341 and avoid friction between the gear teeth 341 and the top cover 37.

In this embodiment, the cylinder 38 is provided with a liquid inlet hole 31 and a liquid outlet hole 32 on the same side, the liquid inlet hole 31 and the liquid outlet hole 32 are respectively communicated with the oil outlet hole 23 and the oil return hole 22 of the block 21 to form a hydraulic oil loop, and the liquid inlet hole 31 and the liquid outlet hole 32 can be switched to realize the reciprocating driving of the piston 36.

The cylinder body 38 is provided with a fifth underflow hole 311 for communicating the liquid inlet hole 31 with the front part of the through hole 381 and a sixth underflow hole 321 for communicating the liquid outlet hole 32 with the rear part of the through hole 381, and the pipeline is internally arranged, so that the complexity of the pipeline is reduced, and the volume is favorably reduced. The openings of the fifth underflow hole 311 and the sixth underflow hole 321 in the through hole 381 are located at the tail ends of the corresponding blocking covers, the two ends of the piston 38 are respectively provided with a flow guide groove 363 in an inwards concave mode, when the piston 38 moves to the limit, the bottom of the flow guide groove 363 is communicated with the corresponding opening of the fifth underflow hole 311 or the sixth underflow hole 321 in the through hole 381, hydraulic oil can enter the flow guide groove 363 conveniently, the piston 38 can be driven, the problem that the piston 38 is stuck when moving to the limit can be avoided, the stroke of the piston 38 can be improved conveniently, and further the space utilization rate can be improved.

In conclusion, the compact electro-hydraulic actuator disclosed by the invention has the advantages of compact volume, large torque output, flexible forward and reverse rotation control and high use stability, and is suitable for driving various large-caliber valves.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A compact electro-hydraulic actuator, comprising: the hydraulic control system comprises an electro-hydraulic power component, a hydraulic actuator and a hydraulic connecting block, wherein the electro-hydraulic power component comprises a motor, a valve block and an oil tank, the valve block is arranged between the motor and the oil tank, the hydraulic connecting block is arranged between the side surface of the valve block and the hydraulic actuating mechanism, the front of the valve block is provided with an oil suction hole, the valve block is internally provided with an oil distribution shaft, the back of the valve block is provided with a bearing eccentric to the oil distribution shaft, the oil distribution shaft is rotatably provided with a plunger cylinder body positioned in the bearing, two sides of the front part of the oil distribution shaft are provided with a first oil inlet and outlet groove positioned in the plunger cylinder body, two sides of the rear part of the oil distribution shaft are provided with second oil inlet and outlet grooves which are in one-to-one correspondence with the first oil inlet and outlet grooves, the plunger piston is characterized in that a plurality of plunger piston holes are radially formed in the plunger piston cylinder body, plungers are respectively arranged in the plunger piston holes, and a transmission sleeve for driving the plunger piston cylinder body to rotate is arranged on a rotating shaft of the motor.

2. The compact electro-hydraulic actuator according to claim 1, wherein the electro-hydraulic power assembly further comprises an oil replenishment spool and a first hydraulic lock, a first mounting hole corresponding to the oil replenishment spool is formed in the valve block, the oil replenishment spool is arranged in the first mounting hole, two first undercurrent holes respectively communicating with a corresponding second oil inlet/outlet groove and the first mounting hole are formed in the valve block, the intersection point of the first undercurrent hole and the first mounting hole respectively corresponds to the positions of the two ends of the oil replenishment spool, a second mounting hole corresponding to the first hydraulic lock is formed in the valve block, the first hydraulic lock is arranged in the second mounting hole, second undercurrent holes extending into the second mounting hole are respectively formed in the first undercurrent hole, the opening positions of the second undercurrent holes in the second mounting hole respectively correspond to the positions of the two ends of the piston rod of the first hydraulic lock, the valve block is characterized in that a first oil inlet and outlet hole and a second oil inlet and outlet hole which penetrate through a second mounting hole are formed in the side face of the valve block, the intersection points of the first oil inlet and outlet hole and the second mounting hole correspond to the positions of two first hydraulic lock valve seats of a first hydraulic lock respectively, and a third undercurrent hole which is communicated with an oil suction hole and the first mounting hole is formed in the valve block.

3. The compact electrohydraulic actuator according to claim 2, wherein an oil suction pipe extending into the oil tank is arranged on the oil suction hole, a gravity oil suction ball is arranged at the tail end of the oil suction pipe, a support spring positioned between the gravity oil suction ball and the valve block is sleeved on the oil suction pipe, and a fourth underflow hole communicating the corresponding first oil inlet and outlet groove and the second oil inlet and outlet groove is arranged in the oil distribution shaft.

4. The compact electrohydraulic actuator according to claim 2, wherein the transmission sleeve is provided with a plurality of blind holes in an annular array, the plunger cylinder body is provided with a transmission column extending into at least one of the blind holes on the front side, the transmission column is provided with a limiting spring extending to the bottom end of the blind hole, the first mounting hole comprises a guide hole and a blocking hole, the blocking hole is arranged at both ends of the guide hole, the diameter of the blocking hole is respectively larger than that of the guide hole to form a stepped hole, the third submerged hole is communicated with the guide hole, the oil compensating spool comprises a first spool head and a second spool head, the first spool head and the second spool head are respectively arranged in the corresponding blocking holes, the first spool head is provided with a spool rod in threaded connection with the second spool head, the spool rod is provided with a tensioning spring, and the spool rod and the tensioning spring are located in the guide hole, the diameter size of the first valve core head and the diameter size of the second valve core head are larger than that of the guide hole, two overflow valve mounting holes which are respectively communicated with the corresponding first down-the-hole are formed in the side face of the valve block, an overflow valve is arranged in each overflow valve mounting hole, and an oil return hole communicated with an oil tank is formed in each overflow valve mounting hole.

5. The compact electrohydraulic actuator according to claim 1, wherein the hydraulic connecting block includes a block body, a second hydraulic lock, a first through joint and a second through joint, the block body has a top surface provided with a downwardly extending oil outlet and an oil return hole at an interval, the block body has a bottom surface provided with an upwardly extending oil inlet and an oil discharge hole at an interval, the block body has a left side surface provided with a first process hole passing through the oil inlet, a rear end surface provided with a second process hole crossing the first process hole and passing through the oil outlet, a front end surface provided with a third process hole passing through the oil return hole, a right side surface provided with a fourth process hole crossing the third process hole and passing through the oil discharge hole, the block body has a second hydraulic lock mounting hole passing through the oil inlet and the oil discharge hole, and the second hydraulic lock is disposed in the second hydraulic lock mounting hole, the second hydraulic lock comprises a first check valve and a second check valve which are arranged oppositely and a piston type ejector rod located between the first check valve and the second check valve, a fifth process hole extending to one side of the front end of the first check valve is formed in the left side of the block body, the first through connector is directly or indirectly communicated with the fifth process hole, a sixth process hole which is communicated with the front end of the second check valve is formed in the right side of the block body, and the second through connector is directly or indirectly communicated with the sixth process hole.

6. The compact electrohydraulic actuator according to claim 5, wherein two ends of the piston type mandril respectively extend to the end portions of a first check valve and a second check valve, the second hydraulic lock mounting hole is located below the third fabrication hole, a bypass plug screw mounting hole extending to the fourth fabrication hole and pointing to the first fabrication hole is formed in the front end face of the block, a seventh fabrication hole extending to the first fabrication hole is formed in the tail end of the bypass plug screw mounting hole, a bypass plug screw is arranged in the bypass plug screw mounting hole to plug the seventh fabrication hole, the first check valve corresponds to the position of the oil inlet hole, and the second check valve corresponds to the position of the oil outlet hole.

7. The compact electro-hydraulic actuator according to claim 5, wherein the block body is provided with an eighth technical hole extending to a fifth technical hole at the front end of the front end face of the left side, a ninth technical hole communicated with the eighth technical hole is provided at the front end of the left side of the block body, the first through joint is installed at the end of the ninth technical hole, the block body is provided with a tenth technical hole extending to a sixth technical hole at the end of the tenth technical hole, the first technical hole, the second technical hole, the third technical hole, the fourth technical hole, the fifth technical hole, the sixth technical hole and the eighth technical hole are provided with ball-expanding plugs for plugging, and the block body is provided with a plurality of installation holes.

8. The compact electrohydraulic actuator according to claim 1, wherein the hydraulic actuator includes a cylinder, a piston and a driving rod, the driving rod is vertically disposed in the cylinder and extends to the outside of the cylinder, a through hole perpendicular to the driving rod is transversely disposed in the cylinder, the piston is concentrically disposed in the through hole, one side of the piston is provided with a flat bottom groove corresponding to the driving rod, a circle of gear teeth corresponding to the flat bottom groove is disposed on an excircle of the driving rod, a rack engaged with the gear teeth or a plurality of bar-shaped teeth transversely spaced from each other are disposed in the flat bottom groove, two ends of the cylinder are provided with plugging covers at two ends of the through hole, an adjusting plug screw pointing to the corresponding end of the piston is disposed in the plugging cover, one side of the cylinder is provided with a liquid inlet hole and a liquid outlet hole, a fifth underflow hole communicating the front portion of the liquid inlet hole and the front portion of the through hole and a sixth underflow hole communicating the liquid outlet hole and, openings of the fifth underflow hole and the sixth underflow hole in the through hole are located at the tail ends of the corresponding blocking covers, and guide grooves are respectively arranged at the two ends of the piston in an inwards concave mode.

9. The compact electrohydraulic actuator according to claim 8, wherein a first hexagon socket wrench hole is formed at an outer end of the adjusting screw plug, a fastening screw pointing to the adjusting screw plug is arranged on one side of the blocking cover, a square column is arranged at the top of the driving rod, the piston is of a cylindrical structure, and sealing rings are arranged on two sides of the flat bottom groove.

10. The compact electrohydraulic actuator according to claim 8, wherein a driving rod mounting hole corresponding to the driving rod is vertically formed in the cylinder body, one side of the driving rod mounting hole is partially communicated with the through hole in a cross manner, a top cover concentric with the driving rod is arranged on the top of the driving rod mounting hole, the driving rod penetrates through the top cover and extends to the upper side of the top cover, a first gasket located between the gear teeth and the top cover is arranged on the driving rod, a bottom cover concentric with the driving rod is arranged at the bottom of the driving rod mounting hole, a second gasket located between the gear teeth and the bottom cover is arranged on the driving rod, the lower portion of the driving rod extends into the bottom cover, and a second hexagon socket wrench hole is arranged at the bottom end of the.