Gate valve electro-hydraulic actuating mechanism

Abstract

The invention provides a gate valve electro-hydraulic actuating mechanism which comprises a gate valve which is arranged on a pipeline and controls the pipeline to be opened or closed. The piston mechanism is connected with the gate valve and drives the gate valve to be opened or closed through a valve rod; the energy accumulator is connected with the piston mechanism, and the energy accumulator is configured to provide hydraulic pressure for the piston mechanism in an emergency state and enable the piston mechanism to push the gate valve to be closed emergently; wherein the gate valve is further connected with a manual device, and the manual device manually drives the gate valve to be closed. When the emergency cut-off device breaks down, the gate valve can be closed through the manual wheel, and when the valve is cut off emergently, the hand wheel can be automatically bounced off and cannot rotate along with the valve rod. When the hand wheel is used, the hand wheel is pushed in, the buckle is embedded, and meanwhile, the valve can be easily opened or closed by a single person according to the speed change principle.

Description

Technical Field

[0001] The invention relates to a gate valve electro-hydraulic actuator, in particular to a gate valve electro-hydraulic actuator with a manual device, and belongs to the field of pipeline gate valve electro-hydraulic actuators. Background Art

[0002] At present, the valve is opened or closed by pumping hydraulic oil with a manual pump when the power is off. However, in this case, once the hydraulic system pipeline or hydraulic accessories fail, the manual pump will not be able to continue working, which will affect the valve action. Therefore, a new handwheel device is designed, which uses a mechanical gear rack to contact the valve stem, no longer relies on the hydraulic system, and can achieve manual and automatic integration and long-term reliability.

[0003] At the same time, it ensures that the handwheel will not rotate with the valve stem when the valve is shut off in an emergency, thereby eliminating the hazards of abnormal automatic valve closing. If there is no disengagement device, the accidental emergency shutoff of the valve when a person is operating the handwheel will cause the handwheel to rotate at high speed and injure the human body. Summary of the invention

[0004] In view of the above technical problems existing in the prior art, in order to ensure that the hand wheel will not rotate with the valve stem when the valve is shut off in an emergency, thereby eliminating the hazards of abnormal automatic valve closing, the present invention proposes a gate valve electro-hydraulic actuator, which can close the gate valve through a manual wheel when the emergency shut-off device fails, and the hand wheel can automatically pop open when the valve is shut off in an emergency, and cannot rotate with the valve stem. When using the hand wheel, push the hand wheel in, insert the buckle, and use the speed change principle at the same time, a single person can easily open or close the valve.

[0005] The present invention provides a gate valve electro-hydraulic actuator, comprising:

[0006] A gate valve, which is arranged on the pipeline and controls the pipeline to be opened or closed;

[0007] A piston mechanism connected to the gate valve, wherein the piston mechanism drives the gate valve to open or close via a valve stem; and

[0008] an accumulator connected to the piston mechanism, the accumulator being configured to provide hydraulic pressure to the piston mechanism in an emergency state, and to enable the piston mechanism to push the gate valve to close urgently;

[0009] Wherein, the gate valve is also connected to a manual device, and the manual device manually drives the gate valve to open or close.

[0010] When the emergency shut-off device fails, the operator can open or close the gate valve by the manual wheel to ensure the smooth opening or closing of the gate valve.

[0011] A further improvement of the present invention is that the piston mechanism comprises a piston cylinder and a piston arranged in the piston cylinder, and the piston is provided with a piston rod connected to the valve rod;

[0012] The piston divides the space in the piston cylinder into an upper space and a lower space, and the upper space and the lower space are respectively connected to oil tanks.

[0013] A further improvement of the present invention is that the accumulator is connected to the upper space of the piston mechanism through an emergency pipeline, and in a normal state, the emergency pipeline is closed; when the gate valve needs to be urgently cut off, the emergency pipeline is opened, and the oil in the accumulator enters the upper space, pushing the piston to move downward, thereby closing the gate valve.

[0014] A further improvement of the present invention is that the manual device includes an upper bracket connected to the piston rod and a lower bracket connected to the valve stem of the gate valve, and an intermediate bracket is arranged between the upper bracket and the bracket; the side of the intermediate bracket is connected to the manual wheel through a force transmission component.

[0015] A further improvement of the present invention is that the force transmission component includes a gear disposed in the intermediate bracket, and a rack matched with the gear;

[0016] The rack is connected to the valve stem; the gear is connected to a gearbox, and the gearbox is connected to the manual wheel through a connecting module and a matching module; the connecting module and the matching module can be separated or connected.

[0017] A further improvement of the present invention is that the connecting module is connected to the gearbox, the matching module is connected to the manual wheel, a fixing pin is provided on the connecting module, a pin hole is provided on the matching module, and the fixing pin can be inserted into the pin hole;

[0018] When the gate valve is manually closed by the manual wheel, the connecting module is connected to the matching module when the manual wheel is pushed inwards, and the manual wheel is rotated in a first direction to drive the gear to rotate through the gearbox, and the gear drives the rack to move downwards, thereby closing the gate valve, and then the manual wheel is pulled out to separate the connecting module from the matching module;

[0019] When the gate valve is opened manually by the manual wheel, the connecting module is connected to the matching module by first pushing the manual wheel inward, and the manual wheel is rotated along the second direction to drive the gear to rotate through the gearbox, and the gear drives the rack to move upward, thereby opening the gate valve, and then the manual wheel is pulled out to separate the connecting module from the matching module.

[0020] When the emergency shut-off device fails, the gate valve can be closed by the manual wheel. When the valve is shut off in an emergency, the handwheel can be automatically opened and cannot rotate with the valve stem. When using the handwheel, push the handwheel in, insert the buckle, and use the speed change principle, so that one person can easily open or close the valve.

[0021] A further improvement of the present invention is that the force transmission component further comprises an oil inlet sleeve, and the oil inlet sleeve is connected to the connection module;

[0022] The emergency pipeline is provided with a handwheel hydraulic pipeline connected to the force transmission component, and the handwheel hydraulic pipeline is connected to the oil lubricating sleeve; in emergency cut-off, the hydraulic oil of the accumulator enters the oil inlet lubricating sleeve through the handwheel hydraulic pipeline, and then enters the connecting module, and the connecting module and the matching module are driven to separate under the pressure of the hydraulic oil.

[0023] Rotating the manual wheel can transfer the rotational force to the middle bracket through the force transmission component, and the middle bracket converts the rotational force into a force that drives the valve stem to move axially. When the hydraulic system is damaged, the gate valve is opened or closed by a manual device. At this time, the operator rotates the manual wheel to make the lower bracket move the valve stem downward or upward, thereby closing or opening the gate valve.

[0024] A further improvement of the present invention is that a connection module oil chamber is provided in the middle of the connection module, a disengagement piston is provided on the connection module oil chamber, and the disengagement piston cooperates with the support rod in the middle of the matching module;

[0025] After the oil in the oil-intake sleeve enters the oil chamber of the connection module, the disengagement piston is driven to extend and the matching module is pushed to move, so that the fixing pin and the pin hole are separated.

[0026] In the gate valve electro-hydraulic actuator described in the present invention, the handwheel hydraulic pipeline is located at the branch of the oil pipeline on the upper part of the piston cylinder. When it is urgently cut off, the high-pressure hydraulic oil of the accumulator enters the oil inlet sleeve through the handwheel hydraulic pipeline, thereby disengaging the grooves of the connecting module and the matching module, and then disengaging the handwheel.

[0027] A further improvement of the present invention is that fixing flanges are provided on the outer sides of the connection module and the oil inlet sleeve, and the fixing flanges are connected to the gearbox.

[0028] A further improvement of the present invention is that a support bracket is provided inside the intermediate bracket;

[0029] One side of the rack is provided with teeth and meshes with the gear; the other side is supported by the support bracket.

[0030] A further improvement of the present invention is that the lower end of the rack is connected to the valve stem via a threaded sleeve.

[0031] A further improvement of the present invention is that a position indicating nut is provided in the middle of the manual wheel.

[0032] Compared with the prior art, the advantages of the present invention are:

[0033] The gate valve electro-hydraulic actuator of the present invention can close the gate valve through the manual wheel when the emergency shut-off device fails. When the valve is shut off in an emergency, the hand wheel can be automatically opened and cannot rotate with the valve stem. When the hand wheel is used, the hand wheel is pushed in and the buckle is embedded. At the same time, the speed change principle is used, and a single person can easily open or close the valve.

[0034] In the gate valve electro-hydraulic actuator of the present invention, the manual wheel can be rotated to transmit the rotational force to the intermediate bracket through the force transmission component, and the intermediate bracket converts the rotational force into a force to drive the valve stem to move axially. When the hydraulic system is damaged, the gate valve is opened or closed by a manual device. At this time, the operator rotates the manual wheel to make the lower bracket move the valve stem downward or upward, thereby closing or opening the gate valve.

[0035] In the gate valve electro-hydraulic actuator described in the present invention, the handwheel hydraulic pipeline is located at the branch of the oil pipeline on the upper part of the piston cylinder. When it is urgently cut off, the high-pressure hydraulic oil of the accumulator enters the oil inlet sleeve through the handwheel hydraulic pipeline, thereby disengaging the grooves of the connecting module and the matching module, and then disengaging the handwheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0037] Figure 1 Shown is a schematic structural diagram of a gate valve electro-hydraulic actuator according to an embodiment of the present invention.

[0038] Figure 2 It is a schematic diagram of the structure of a manual device according to an embodiment of the present invention; it shows the structure of the main view;

[0039] Figure 3 It is a schematic diagram of the structure of a manual device according to an embodiment of the present invention; it shows the structure from a side view;

[0040] Figure 4 for Figure 2 AA surface section view;

[0041] Figure 5 Shown is a schematic structural diagram of a connecting module and a matching module according to an embodiment of the present invention.

[0042] The drawings are not drawn to scale.

[0043] The meanings of the reference numerals in the accompanying drawings are as follows:

[0044] 1. Gate valve, 2. Piston mechanism, 3. Accumulator, 4. Upper bracket, 5. Lower bracket, 6. Intermediate bracket, 7. Manual wheel, 8. Force transmission component, 11. Pipeline, 12. Valve stem, 21. Piston cylinder, 22. Piston rod, 23. Piston, 24. Upper space, 25. Lower space, 31. Emergency pipeline, 61. Gear, 62. Rack, 63. Support bracket, 64. Screw sleeve, 71. Matching module, 72. Positioning nut, 81. Connection module, 82. Gearbox, 83. Fixed flange, 84. Oil inlet sleeve, 85. Handwheel hydraulic pipeline, 86. Installation sheet metal, 87. Connection module oil chamber, 88. Fixing pin, 89. Disengagement piston. DETAILED DESCRIPTION

[0045] In order to make the technical solutions and advantages of the present invention more clearly understood, the exemplary embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than an exhaustive list of all the embodiments. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0046] At present, in the case of power failure, the valve is opened or closed by pumping hydraulic oil with a manual pump. However, in this case, once the hydraulic system pipeline or hydraulic accessories fail, the manual pump will not be able to continue working, thereby affecting the valve action.

[0047] In addition, the handwheel can output a force of 70000N to 150000N, covering the thrust required by common valves. The manual input force is less than 800N, and a single person can easily operate it. The manual valve opening and closing time can also meet the requirements of the site. At the same time, the safety of the operator must be ensured when operating the handwheel to open and close the gate valve 1, especially considering the hazards during emergency shut-off. For example, when the valve is accidentally shut off during emergency shut-off when the person is operating the handwheel, the handwheel will be driven to rotate at high speed, thereby injuring the human body. Therefore, when the valve is shut off in an emergency, the handwheel should be automatically opened and cannot rotate with the valve stem 12. When using the handwheel, push the handwheel in, insert the buckle, and use the speed change principle at the same time, so that a single person can easily open or close the valve.

[0048] In order to solve the above problems, the present invention proposes the gate valve electro-hydraulic actuator, which can close the gate valve 1 through the manual wheel 7 when the emergency shut-off device fails, and the hand wheel can automatically pop open when the valve is urgently shut off, and cannot rotate with the valve stem 12. When the hand wheel is used, the hand wheel is pushed in, the buckle is embedded, and the speed change principle is used, so that a single person can easily open or close the valve.

[0049] In one embodiment, Figure 1 A gate valve electro-hydraulic actuator according to the present invention is schematically shown, comprising:

[0050] The gate valve 1 is arranged on the pipeline 11. When the gate valve 1 is opened, the pipeline 11 is connected; when the gate valve 1 is closed, the pipeline 11 is closed.

[0051] The gate valve 1 is connected to the piston mechanism 2 via a valve stem 12, and the piston mechanism 2 drives the gate valve 1 to open or close;

[0052] The piston mechanism 2 is connected to an accumulator 3 , and the accumulator 3 can provide hydraulic pressure to the piston mechanism 2 in an emergency state, so that the piston mechanism 2 pushes the gate valve 1 to close urgently.

[0053] The gate valve 1 is also connected to a manual device, and the manual device manually drives the gate valve 1 to be opened or closed.

[0054] In the gate valve electro-hydraulic actuator according to this embodiment, high-pressure hydraulic oil is stored in the accumulator 3 for emergency shutoff of the gate valve 1. When the gate valve 1 is shutoff in an emergency, the hydraulic oil in the accumulator 3 is injected into the piston mechanism 2, and the piston mechanism 2 moves downward under the action of the hydraulic pressure, and the piston mechanism 2 drives the valve stem 12 to move downward, thereby pushing the gate valve 1 to close, and realizing the emergency shutoff of the gate valve 1.

[0055] When the hydraulic system is damaged, when the gate valve 1 is to be opened or closed, the gate valve 1 is manually driven to be opened or closed by operating the manual device.

[0056] In one embodiment, the piston mechanism 2 includes a piston cylinder 21, a piston 23 is disposed in the piston cylinder 21, a piston rod 22 is disposed on the piston 23, and the piston rod 22 is connected to the valve stem 12. The piston 23 divides the space in the piston cylinder 21 into an upper space 24 and a lower space 25, and the upper space 24 and the lower space 25 are respectively connected to an oil tank. The pipeline connecting the upper space 24 and the lower space 25 of the oil tank is connected to a pumping device, and the pumping device pumps the oil in the oil tank into the piston cavity or pumps the oil in the piston cavity back to the oil tank.

[0057] When closing the gate valve 1, the oil in the oil tank is pumped into the upper space 24 of the piston cylinder 21, and the oil in the lower space 25 of the piston cylinder 21 flows back into the oil tank, and the piston moves downward under the drive of the hydraulic pressure, thereby driving the valve stem 12 to move downward, and the valve stem 12 drives the gate valve 1 to close. When opening the gate valve 1, the oil in the oil tank is pumped into the lower space 25 of the piston cylinder 21, and the oil in the upper space 24 of the piston cylinder 21 flows back into the oil tank, and the piston moves upward under the drive of the hydraulic pressure, thereby driving the valve stem 12 to move upward, and the valve stem 12 drives the gate valve 1 to open.

[0058] Preferably, the upper space 24 of the piston mechanism 2 is connected to the accumulator 3 through an emergency pipeline 31. The accumulator 3 stores hydraulic oil and accumulates a certain pressure. In a normal state, the emergency pipeline 31 is in a closed state, and the accumulator 3 is in an energy storage state. When an emergency occurs, the emergency pipeline 31 is opened, and the accumulator 3 is connected to the upper space 24 of the piston mechanism 2, and the hydraulic pressure inside the accumulator 3 is quickly filled into the upper space 24. The oil in the lower space 25 of the piston mechanism 2 flows into the oil tank, and the piston moves downward, thereby driving the valve stem 12 to move downward, and the valve stem 12 drives the gate valve 1 to close.

[0059] In this embodiment, the structure of the accumulator 3 preferably includes a shell and an airbag arranged inside the shell. The airbag divides the space inside the shell into two parts. The upper part is the inside of the airbag, which is pre-filled with nitrogen at a certain pressure. The gear 61 pump continuously pumps hydraulic oil into the lower part of the accumulator 3. As the hydraulic oil continues to enter, the airbag is squeezed, and the nitrogen in the airbag is compressed, so that the pressure of the entire accumulator 3 is gradually increased to form emergency cut-off energy. When emergency cut-off needs to be performed, the lower hydraulic oil will enter the hydraulic pipeline under the push of the airbag, thereby performing emergency cut-off.

[0060] In one embodiment, Figure 2 and Figure 3 As shown, the manual device includes an upper bracket 4 connected to the piston rod 22 and a lower bracket 4 connected to the gate valve 1, and an intermediate bracket 6 is arranged between the upper bracket 4 and the brackets; the side of the intermediate bracket 6 is connected to the manual wheel 7 through a force transmission component 8.

[0061] The manual wheel 7 can be rotated to transmit the rotational force to the intermediate bracket 6 through the force transmission component 8, and the intermediate bracket 6 converts the rotational force into a force that drives the valve stem 12 to move axially. When the hydraulic system is damaged, the gate valve 1 is opened or closed by a manual device. At this time, the operator rotates the manual wheel 7 to make the lower bracket 4 move the valve stem 12 downward or upward, thereby closing or opening the gate valve 1.

[0062] In one embodiment, the manual wheel 7 is connected to the force transmission component 8 in a detachable manner. In a normal state, there is a certain distance between the manual wheel 7 and the force transmission component 8, and the two are not connected. When the manual wheel 7 needs to be operated to control the gate valve 1, the manual wheel 7 is pushed to connect with the force transmission component 8, and then the manual wheel 7 is rotated. The force transmission component 8 transmits the twisting force of the rotating wheel to the intermediate bracket 6, thereby controlling the valve stem 12 to move up and down.

[0063] When using the gate valve electro-hydraulic actuator according to this embodiment, when the hydraulic system is damaged, the gate valve 1 is controlled by the manual wheel 7. First, the manual wheel 7 is pushed to connect the manual wheel 7 with the force transmission component 8. At this time, rotating the manual wheel 7 can push or pull the valve stem 12, thereby driving the gate valve 1 to close or open.

[0064] In one embodiment, Figure 4 As shown, the force transmission component 8 includes a gear 61 and a rack 62 arranged in the intermediate bracket 6. The gear 61 and the rack 62 are both provided with teeth, and the teeth of the gear 61 and the rack 62 mesh with each other. When the gear 61 rotates, the torsion is transmitted to the rack 62 through the teeth, driving the rack 62 to move axially. The rack 62 is connected to the valve stem 12; the gear 61 is connected to a gearbox 82, and the gearbox 82 is connected to the manual wheel 7 through a connecting module 81 and a matching module 71; the connecting module 81 and the matching module 71 can be separated or connected.

[0065] In the gate valve electro-hydraulic actuator according to the present embodiment, the connecting module 81 and the matching module 71 can be connected in a plug-in manner. When the manual wheel 7 is pushed to move inward, the connecting module 81 is connected to the matching module 71. The torque generated by the rotation of the manual wheel 7 can be transmitted to the gearbox 82 through the matching module 71 and the connecting module 81. The gearbox 82 transmits the torque to the gear 61 after deceleration. The gear 61 meshes with the rack 62, thereby driving the rack 62 to move up and down, and then driving the valve stem 12 to move up and down, and finally closing or opening the gate valve 1.

[0066] The gearbox 82 can relieve the force of twisting the manual wheel 7 , so that the operator can twist the manual wheel 7 to operate the gate valve 1 .

[0067] In one embodiment, Figure 5 As shown, the connecting module 81 is connected to the gearbox 82, the matching module 71 is connected to the manual wheel 7, a fixing pin 88 is provided on the connecting module 81, and a pin hole is provided on the matching module 71, and the fixing pin 88 can be inserted into the pin hole.

[0068] When the gate valve 1 is manually closed by the manual wheel 7, the connecting module 81 is connected to the matching module 71 when the manual wheel 7 is pushed inwards, and the manual wheel 7 is rotated in a first direction to drive the gear 61 to rotate through the gearbox 82, and the gear 61 drives the rack 62 to move downwards, thereby closing the gate valve 1, and then the manual wheel 7 is pulled out to separate the connecting module 81 from the matching module 71;

[0069] When the gate valve 1 is opened manually by the manual wheel 7, the connecting module 81 is connected to the matching module 71 when the manual wheel 7 is pushed inward first, and the manual wheel 7 is rotated along the second direction to drive the gear 61 to rotate through the gearbox 82, and the gear 61 drives the rack 62 to move upward, thereby opening the gate valve 1, and then the manual wheel 7 is pulled out to separate the connecting module 81 from the matching module 71.

[0070] The first direction and the second direction are opposite, for example, if the first direction is clockwise, the second direction is counterclockwise; if the first direction is counterclockwise, the second direction is clockwise.

[0071] Preferably, the fixing pins 88 are evenly arranged in the circumferential direction of one side of the connecting module 81, and the pin holes of the matching modules 71 match the positions of the fixing pins 88. When the manual wheel 7 is pushed toward the direction of the intermediate bracket 6, the fixing pins 88 are inserted into the pin holes, and the matching modules 71 are connected to the connecting module 81. When the manual wheel 7 is pulled away from the direction of the intermediate bracket 6, the fixing pins 88 are disengaged from the pin holes, and the matching modules 71 are separated from the connecting module 81. In this way, the rotation of the manual wheel 7 will not affect the opening and closing of the gate valve 1, and the opening and closing of the gate valve 1 will not drive the manual wheel 7 to rotate, thereby preventing the rotation of the manual wheel 7 from injuring the human body or other nearby devices.

[0072] In one embodiment, the force transmission component 8 further includes an oil inlet sleeve 84, and the oil inlet sleeve 84 is connected to the connection module 81;

[0073] The emergency pipeline 31 is provided with a handwheel hydraulic pipeline 85 connected to the force transmission component 8, and the handwheel hydraulic pipeline 85 is connected to the oil lubricating sleeve; in emergency cut-off, the hydraulic oil of the accumulator 3 enters the oil inlet lubricating sleeve 84 through the handwheel hydraulic pipeline 85, and then enters the connecting module 81, and the connecting module 81 and the matching module 71 are driven to separate under the action of the pressure of the hydraulic oil.

[0074] In the gate valve electro-hydraulic actuator according to the present embodiment, the handwheel hydraulic pipeline 85 is located at a branch of the oil pipeline on the upper part of the piston cylinder 21. When the emergency is cut off, the high-pressure hydraulic oil of the accumulator 3 enters the oil inlet sleeve 84 through the handwheel hydraulic pipeline 85, thereby disengaging the groove of the connecting module 81 from the matching module 71, and then disengaging the handwheel.

[0075] In this way, the hand wheel will not rotate with the valve stem 12 when the gate valve 1 is shut off in an emergency, thereby preventing the harm caused by abnormal automatic valve closing. If there is no disengagement device, the valve will be shut off unexpectedly when a person is operating the manual wheel 7, which will cause the manual wheel 7 to rotate at high speed and cause harm to the human body.

[0076] In one embodiment, a connection module oil chamber 87 is provided in the middle of the connection module 81 , and a disengagement piston 89 is provided on the connection module oil chamber 87 . The disengagement piston 89 can cooperate with the support rod in the middle of the matching module 71 .

[0077] After the oil in the oil-intake sleeve 84 enters the oil chamber 87 of the connecting module, it drives the disengagement piston 89 to extend and pushes the matching module 71 to move, so that the fixing pin 88 is separated from the pin hole.

[0078] At the same time of emergency cut-off, the high-pressure hydraulic oil of the accumulator 3 enters the oil inlet sleeve 84 through the handwheel hydraulic pipeline 85, and then enters the connecting module oil chamber 87 of the connecting module 81. The high-pressure hydraulic oil in the connecting module oil chamber 87 pushes the matching module 71 outward, and the fixing pin 88 on the connecting module 81 disengages from the groove of the matching module 71, thereby disengaging the handwheel.

[0079] In one embodiment, Figure 4 As shown, a fixing flange 83 is provided on the outer sides of the connecting module 81 and the oil inlet sleeve 84 , and the fixing flange 83 is connected to the gearbox 82 .

[0080] Preferably, a support bracket 63 is provided inside the intermediate bracket 6;

[0081] One side of the rack 62 is provided with teeth and meshes with the gear 61 ; the other side is supported by the support bracket 63 .

[0082] In this embodiment, the support bracket 63 is arranged opposite to the roller, the roller is arranged on one side of the rack 62 with teeth, and the support bracket 63 is arranged on the other side, and the two tighten the rack 62. In this embodiment, the support bracket 63 can be a roller structure, and the support bracket 63 can roll on the rack 62 when the rack 62 moves; the support bracket 63 can also be a smooth arc structure, and the side of the support bracket 63 without the rack 62 is a smooth surface, and the support bracket 63 and the rack 62 slide relative to each other.

[0083] In a preferred embodiment, the lower end of the rack 62 is connected to the valve stem 12 via a screw sleeve 64. Specifically, a screw sleeve 64 is embedded inside the rack 62, and the screw sleeve 64 is connected to the valve stem 12, and the up and down movement of the rack 62 simultaneously drives the gate valve 1 to perform an opening and closing movement.

[0084] In one embodiment, Figure 3 As shown, a position indicating nut 72 is provided in the middle of the manual wheel 7. The position indicating nut 72 has a pointer, and the operator can judge the position relationship between the manual wheel 7 (including the matching module 71) and the connection module 81 through the pointer, so as to judge whether the gate valve 1 is in place while operating the manual wheel 7.

[0085] In the gate valve electro-hydraulic actuator according to this embodiment, the accumulator 3 stores high-pressure hydraulic oil for emergency shutoff of the valve. When the valve is shutoff, the hydraulic oil in the accumulator 3 enters the upper space 24 of the piston through the emergency pipeline 31 of the piston cylinder 21, pushing the piston to move downward, and the hydraulic oil in the lower space 25 of the piston flows back to the oil tank through the lower oil pipeline of the piston cylinder 21. When the piston moves downward, it drives the valve stem 12 to move downward, realizing the emergency shutoff of the valve.

[0086] When the hydraulic system is damaged and you want to open or close the valve, do the following:

[0087] The manual wheel 7 is pushed toward the direction of the intermediate bracket 6, and the manual wheel 7 moves inward, so that the fixing pin 88 on the connecting module 81 is inserted into the groove of the matching module 71, so that the connecting module 81 is connected to the matching module 71, and the manual wheel 7 is manually rotated to drive the transmission to rotate.

[0088] When the transmission rotates, it is decelerated and drives the gear 61 to rotate. The gear 61 rotates and drives the rack 62 to move up and down through the teeth.

[0089] The lower part of the rack 62 is inlaid with a screw sleeve 64, which is connected to the valve stem 12. The rack 62 drives the gate valve 1 to do an on-off movement while moving up and down.

[0090] When the operation is finished, the manual wheel 7 can be manually pulled outward, so that the fixing pin 88 on the connecting module 81 is disengaged from the groove of the matching module 71, and then the manual wheel 7 is disengaged, so as to ensure that the hand wheel will not rotate at high speed during the next emergency cutoff.

[0091] If you forget to disengage the handwheel, the following protective measures will come into play:

[0092] When the hydraulic system is normal, such as when the gate valve 1 performs emergency shut-off, the hydraulic oil in the accumulator 3 enters the upper space 24 of the piston cylinder 21 through the upper oil pipeline of the piston cylinder 21, pushing the piston to move downward, and the hydraulic oil in the lower space 25 of the piston flows back to the oil tank through the lower oil pipeline of the piston cylinder 21. When the piston moves downward, it drives the valve stem 12 to move downward, realizing the emergency shut-off of the gate valve 1.

[0093] The handwheel hydraulic pipeline 85 is located at the branch of the emergency pipeline 31 at the upper part of the piston cylinder 21. When the emergency is cut off, the high-pressure hydraulic oil of the accumulator 3 enters the oil inlet sleeve 84 through the handwheel hydraulic pipeline 85, and then enters the connecting module oil chamber 87. The high-pressure hydraulic oil in the connecting module oil chamber 87 pushes the matching module 71 outward, and the fixing pin 88 on the connecting module 81 is disengaged from the groove of the matching module 71, thereby disengaging the handwheel.

[0094] In this way, the hand wheel will not rotate with the valve stem 12 when the gate valve 1 is shut off in an emergency, thereby preventing the harm caused by abnormal automatic valve closing. If there is no disengagement device, the gate valve 1 is accidentally shut off in an emergency when a person operates the manual wheel 7, which will cause the hand wheel to rotate at high speed and cause harm to the human body.

[0095] The following describes the specific embodiments:

[0096] Example 1

[0097] According to the gate valve electro-hydraulic actuator described in this embodiment, it includes: a gate valve 1, wherein the gate valve 1 is arranged on a pipeline 11, and when the gate valve 1 is open, the pipeline 11 is connected; when the gate valve 1 is closed, the pipeline 11 is closed.

[0098] The gate valve 1 is connected to the piston mechanism 2 via a valve stem 12 , and the piston mechanism 2 drives the gate valve 1 to open or close.

[0099] The piston mechanism 2 is connected to an accumulator 3 , and the accumulator 3 can provide hydraulic pressure to the piston mechanism 2 in an emergency state, so that the piston mechanism 2 pushes the gate valve 1 to close urgently.

[0100] The gate valve 1 is also connected to a manual device, and the manual device is used to manually drive the gate valve 1 to be closed.

[0101] The piston mechanism 2 includes a piston cylinder 21, a piston is arranged in the piston cylinder 21, a piston rod 22 is arranged on the piston, and the piston rod 22 is connected to the valve stem 12. The piston divides the space in the piston cylinder 21 into an upper space 24 and a lower space 25, and the upper space 24 and the lower space 25 are respectively connected to the oil tank. The pipeline connecting the upper space 24 and the lower space 25 of the oil tank is connected to a pumping device, and the pumping device pumps the oil in the oil tank into the piston cavity or pumps the oil in the piston cavity back to the oil tank.

[0102] When closing the gate valve 1, the oil in the oil tank is pumped into the upper space 24 of the piston cylinder 21, and the oil in the lower space 25 of the piston cylinder 21 flows back into the oil tank, and the piston moves downward under the drive of the hydraulic pressure, thereby driving the valve stem 12 to move downward, and the valve stem 12 drives the gate valve 1 to close. When opening the gate valve 1, the oil in the oil tank is pumped into the lower space 25 of the piston cylinder 21, and the oil in the upper space 24 of the piston cylinder 21 flows back into the oil tank, and the piston moves upward under the drive of the hydraulic pressure, thereby driving the valve stem 12 to move upward, and the valve stem 12 drives the gate valve 1 to open.

[0103] The manual device comprises an upper bracket 4 connected to the piston rod 22 and a lower bracket 4 connected to the gate valve 1 , and an intermediate bracket 6 is arranged between the upper bracket 4 and the brackets; the side of the intermediate bracket 6 is connected to the manual wheel 7 through a force transmission component 8 .

[0104] The manual wheel 7 can be rotated to transmit the rotational force to the intermediate bracket 6 through the force transmission component 8, and the intermediate bracket 6 converts the rotational force into a force that drives the valve stem 12 to move axially. When the hydraulic system is damaged, the gate valve 1 is opened or closed by a manual device. At this time, the operator rotates the manual wheel 7 to make the lower bracket 4 move the valve stem 12 downward, thereby closing the gate valve 1.

[0105] The force transmission component 8 includes a gear 61 and a rack 62 disposed in the intermediate bracket 6. The gear 61 and the rack 62 are both provided with teeth, and the teeth of the gear 61 and the rack 62 mesh with each other. When the gear 61 rotates, the torsion is transmitted to the rack 62 through the teeth, driving the rack 62 to move axially. The rack 62 is connected to the valve stem 12; the gear 61 is connected to a gearbox 82, and the gearbox 82 is connected to the manual wheel 7 through a connecting module 81 and a matching module 71; the connecting module 81 and the matching module 71 can be separated or connected.

[0106] The connecting module 81 is connected to the gearbox 82, and the matching module 71 is connected to the manual wheel 7. A fixing pin 88 is provided on the connecting module 81, and a pin hole is provided on the matching module 71. The fixing pin 88 can be inserted into the pin hole.

[0107] Example 2

[0108] According to the gate valve electro-hydraulic actuator described in this embodiment, it includes: a gate valve 1, wherein the gate valve 1 is arranged on a pipeline 11, and when the gate valve 1 is open, the pipeline 11 is connected; when the gate valve 1 is closed, the pipeline 11 is closed.

[0109] The gate valve 1 is connected to the piston mechanism 2 via a valve stem 12 , and the piston mechanism 2 drives the gate valve 1 to open or close.

[0110] The piston mechanism 2 is connected to an accumulator 3 , and the accumulator 3 can provide hydraulic pressure to the piston mechanism 2 in an emergency state, so that the piston mechanism 2 pushes the gate valve 1 to close urgently.

[0111] The gate valve 1 is also connected to a manual device, and the manual device manually drives the gate valve 1 to be opened or closed.

[0112] The piston mechanism 2 includes a piston cylinder 21, a piston is arranged in the piston cylinder 21, a piston rod 22 is arranged on the piston, and the piston rod 22 is connected to the valve stem 12. The piston divides the space in the piston cylinder 21 into an upper space 24 and a lower space 25, and the upper space 24 and the lower space 25 are respectively connected to the oil tank. The pipeline connecting the upper space 24 and the lower space 25 of the oil tank is connected to a pumping device, and the pumping device pumps the oil in the oil tank into the piston cavity or pumps the oil in the piston cavity back to the oil tank.

[0113] When closing the gate valve 1, the oil in the oil tank is pumped into the upper space 24 of the piston cylinder 21, and the oil in the lower space 25 of the piston cylinder 21 flows back into the oil tank, and the piston moves downward under the drive of the hydraulic pressure, thereby driving the valve stem 12 to move downward, and the valve stem 12 drives the gate valve 1 to close. When opening the gate valve 1, the oil in the oil tank is pumped into the lower space 25 of the piston cylinder 21, and the oil in the upper space 24 of the piston cylinder 21 flows back into the oil tank, and the piston moves upward under the drive of the hydraulic pressure, thereby driving the valve stem 12 to move upward, and the valve stem 12 drives the gate valve 1 to open.

[0114] The manual device comprises an upper bracket 4 connected to the piston rod 22 and a lower bracket 4 connected to the gate valve 1 , and an intermediate bracket 6 is arranged between the upper bracket 4 and the brackets; the side of the intermediate bracket 6 is connected to the manual wheel 7 through a force transmission component 8 .

[0115] The manual wheel 7 can be rotated to transmit the rotational force to the intermediate bracket 6 through the force transmission component 8, and the intermediate bracket 6 converts the rotational force into a force that drives the valve stem 12 to move axially. When the hydraulic system is damaged, the gate valve 1 is opened or closed by a manual device. At this time, the operator rotates the manual wheel 7 to make the lower bracket 4 move the valve stem 12 upward or downward, thereby opening or closing the gate valve 1.

[0116] The force transmission component 8 includes a gear 61 and a rack 62 disposed in the intermediate bracket 6. The gear 61 and the rack 62 are both provided with teeth, and the teeth of the gear 61 and the rack 62 mesh with each other. When the gear 61 rotates, the torsion is transmitted to the rack 62 through the teeth, driving the rack 62 to move axially. The rack 62 is connected to the valve stem 12; the gear 61 is connected to a gearbox 82, and the gearbox 82 is connected to the manual wheel 7 through a connecting module 81 and a matching module 71; the connecting module 81 and the matching module 71 can be separated or connected.

[0117] The connecting module 81 is connected to the gearbox 82, and the matching module 71 is connected to the manual wheel 7. A fixing pin 88 is provided on the connecting module 81, and a pin hole is provided on the matching module 71. The fixing pin 88 can be inserted into the pin hole.

[0118] The force transmission component 8 further includes an oil inlet sleeve 84, and the oil inlet sleeve 84 is connected to the connection module 81;

[0119] The emergency pipeline 31 is provided with a handwheel hydraulic pipeline 85 connected to the force transmission component 8, and the handwheel hydraulic pipeline 85 is connected to the oil lubricating sleeve; in emergency cut-off, the hydraulic oil of the accumulator 3 enters the oil inlet lubricating sleeve 84 through the handwheel hydraulic pipeline 85, and then enters the connecting module 81, and the connecting module 81 and the matching module 71 are driven to separate under the action of the pressure of the hydraulic oil.

[0120] The handwheel hydraulic pipeline 85 is located at the branch of the oil pipeline on the upper part of the piston cylinder 21. When it is urgently cut off, the high-pressure hydraulic oil of the accumulator 3 enters the oil inlet sleeve 84 through the handwheel hydraulic pipeline 85, thereby disengaging the groove of the connecting module 81 and the matching module 71, and then disengaging the handwheel.

[0121] In this way, the hand wheel will not rotate with the valve stem 12 when the gate valve 1 is shut off in an emergency, thereby preventing the harm caused by abnormal automatic valve closing. If there is no disengagement device, the valve will be shut off unexpectedly when a person is operating the manual wheel 7, which will cause the manual wheel 7 to rotate at high speed and cause harm to the human body.

[0122] A connection module oil chamber 87 is provided in the middle of the connection module 81 , and a disengagement piston 89 is provided on the connection module oil chamber 87 . The disengagement piston 89 can cooperate with the support rod in the middle of the matching module 71 .

[0123] After the oil in the oil-intake sleeve 84 enters the oil chamber 87 of the connecting module, it drives the disengagement piston 89 to extend and pushes the matching module 71 to move, so that the fixing pin 88 is separated from the pin hole.

[0124] Example 3

[0125] According to the gate valve electro-hydraulic actuator described in this embodiment, it includes: a gate valve 1, wherein the gate valve 1 is arranged on a pipeline 11, and when the gate valve 1 is open, the pipeline 11 is connected; when the gate valve 1 is closed, the pipeline 11 is closed.

[0126] The gate valve 1 is connected to the piston mechanism 2 via a valve stem 12 , and the piston mechanism 2 drives the gate valve 1 to open or close.

[0127] The piston mechanism 2 is connected to an accumulator 3 , and the accumulator 3 can provide hydraulic pressure to the piston mechanism 2 in an emergency state, so that the piston mechanism 2 pushes the gate valve 1 to close urgently.

[0128] The gate valve 1 is also connected to a manual device, and the manual device is used to manually drive the gate valve 1 to be closed.

[0129] The piston mechanism 2 includes a piston cylinder 21, a piston 23 is arranged in the piston cylinder 21, a piston rod 22 is arranged on the piston 23, and the piston rod 22 is connected to the valve stem 12. The piston 23 divides the space in the piston cylinder 21 into an upper space 24 and a lower space 25, and the upper space 24 and the lower space 25 are respectively connected to the oil tank. The pipeline connecting the upper space 24 and the lower space 25 of the oil tank is connected to a pumping device, and the pumping device pumps the oil in the oil tank into the piston cavity or pumps the oil in the piston cavity back to the oil tank.

[0130] When closing the gate valve 1, the oil in the oil tank is pumped into the upper space 24 of the piston cylinder 21, and the oil in the lower space 25 of the piston cylinder 21 flows back into the oil tank, and the piston moves downward under the drive of the hydraulic pressure, thereby driving the valve stem 12 to move downward, and the valve stem 12 drives the gate valve 1 to close. When opening the gate valve 1, the oil in the oil tank is pumped into the lower space 25 of the piston cylinder 21, and the oil in the upper space 24 of the piston cylinder 21 flows back into the oil tank, and the piston moves upward under the drive of the hydraulic pressure, thereby driving the valve stem 12 to move upward, and the valve stem 12 drives the gate valve 1 to open.

[0131] The manual device comprises an upper bracket 4 connected to the piston rod 22 and a lower bracket 4 connected to the gate valve 1 , and an intermediate bracket 6 is arranged between the upper bracket 4 and the brackets; the side of the intermediate bracket 6 is connected to the manual wheel 7 through a force transmission component 8 .

[0132] The manual wheel 7 can be rotated to transmit the rotational force to the intermediate bracket 6 through the force transmission component 8, and the intermediate bracket 6 converts the rotational force into a force that drives the valve stem 12 to move axially. When the hydraulic system is damaged, the gate valve 1 is opened or closed by a manual device. At this time, the operator rotates the manual wheel 7 to make the lower bracket 4 move the valve stem 12 upward or downward, thereby opening or closing the gate valve 1.

[0133] The force transmission component 8 includes a gear 61 and a rack 62 disposed in the intermediate bracket 6. The gear 61 and the rack 62 are both provided with teeth, and the teeth of the gear 61 and the rack 62 mesh with each other. When the gear 61 rotates, the torsion is transmitted to the rack 62 through the teeth, driving the rack 62 to move axially. The rack 62 is connected to the valve stem 12; the gear 61 is connected to a gearbox 82, and the gearbox 82 is connected to the manual wheel 7 through a connecting module 81 and a matching module 71; the connecting module 81 and the matching module 71 can be separated or connected.

[0134] A support bracket 63 is disposed inside the intermediate bracket 6 ; one side of the rack 62 is provided with teeth and meshes with the gear 61 ; the other side is supported by the support bracket 63 .

[0135] The support bracket 63 is arranged opposite to the roller, the roller is arranged on one side of the rack 62 with teeth, and the support bracket 63 is arranged on the other side, and the two tighten the rack 62. The support bracket 63 can be a roller structure, and the support bracket 63 can roll on the rack 62 when the rack 62 moves.

[0136] Example 4

[0137] This embodiment makes the following improvements on the basis of Embodiment 3:

[0138] A support bracket 63 is disposed inside the intermediate bracket 6 ; one side of the rack 62 is provided with teeth and meshes with the gear 61 ; the other side is supported by the support bracket 63 .

[0139] The support bracket 63 is arranged opposite to the roller, the roller is arranged on one side of the rack 62 with teeth, and the support bracket 63 is arranged on the other side, and the two tighten the rack 62. The support bracket 63 is a smooth arc structure, and the side of the support bracket 63 where the rack 62 is not arranged is a smooth surface, and the support bracket 63 and the rack 62 slide relative to each other.

[0140] It should be understood that the embodiments disclosed in the present invention are not limited to the specific structures, processing steps or materials disclosed herein, but should be extended to equivalent substitutions of these features understood by ordinary technicians in the relevant field. It should also be understood that the terms used herein are only used for the purpose of describing specific embodiments and are not meant to be limiting.

[0141] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0142] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0143] Certain terms are used throughout this specification to refer to specific system components. As will be appreciated by those skilled in the art, different names may be used to refer to the same component, and thus this specification is not intended to distinguish between components that differ only in name and not in function. References to "one embodiment" or "an embodiment" in the specification mean that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the invention. Therefore, the phrases "one embodiment" or "an embodiment" appearing in various places throughout the specification do not necessarily all refer to the same embodiment.

[0144] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0145] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and / or modifications that fall within the scope of the present invention, and changes and / or modifications made according to the embodiments of the present invention should be included within the scope of protection of the present invention.

Claims

1. A gate valve electro-hydraulic actuator, characterized in that: include: A gate valve (1), wherein the gate valve (1) is arranged on the pipeline (11) and controls the pipeline (11) to be opened or closed; A piston mechanism (2) connected to the gate valve (1), wherein the piston mechanism (2) drives the gate valve (1) to open or close via a valve stem (12); and an accumulator (3) connected to the piston mechanism (2), the accumulator (3) being configured to provide hydraulic pressure to the piston mechanism (2) in an emergency state, so that the piston mechanism (2) pushes the gate valve (1) to close urgently; The gate valve (1) is also connected to a manual device, and the manual device is used to manually drive the gate valve (1) to open or close.

2. The gate valve electro-hydraulic actuator according to claim 1, characterized in that: The piston mechanism (2) comprises a piston cylinder (21) and a piston (23) arranged in the piston cylinder (21); the piston (23) is provided with a piston rod (22) connected to the valve stem (12); The piston (23) divides the space in the piston cylinder (21) into an upper space (24) and a lower space (25), and the upper space (24) and the lower space (25) are respectively connected to oil tanks.

3. The gate valve electro-hydraulic actuator according to claim 2, characterized in that: The accumulator (3) is connected to the upper space (24) of the piston mechanism (2) via an emergency pipeline (31). In a normal state, the emergency pipeline (31) is closed; when the gate valve (1) needs to be shut off urgently, the emergency pipeline (31) is opened, and the oil in the accumulator (3) enters the upper space (24), pushing the piston to move downward, thereby closing the gate valve (1).

4. The gate valve electro-hydraulic actuator according to claim 2 or 3, characterized in that: The manual device comprises an upper bracket (4) connected to a piston rod (22) and a lower bracket (4) connected to a valve stem (12) of the gate valve (1), an intermediate bracket (6) being arranged between the upper bracket (4) and the bracket; the side surface of the intermediate bracket (6) is connected to a manual wheel (7) via a force transmission component (8).

5. The gate valve electro-hydraulic actuator according to claim 4, characterized in that: The force transmission component (8) comprises a gear (61) arranged in the intermediate bracket (6), and a rack (62) matched with the gear (61); The rack (62) is connected to the valve stem (12); the gear (61) is connected to a gearbox (82), and the gearbox (82) is connected to the manual wheel (7) via a connecting module (81) and a matching module (71); the connecting module (81) and the matching module (71) can be separated or connected.

6. The gate valve electro-hydraulic actuator according to claim 5, characterized in that: The connecting module (81) is connected to the gearbox (82), the matching module (71) is connected to the manual wheel (7), the connecting module (81) is provided with a fixing pin (88), the matching module (71) is provided with a pin hole, and the fixing pin (88) can be inserted into the pin hole; When the gate valve (1) is manually closed by means of the manual wheel (7), the manual wheel (7) is first pushed inward to connect the connecting module (81) with the matching module (71), the manual wheel (7) is rotated in a first direction, the gear (61) is driven to rotate through the gearbox (82), and the gear (61) drives the rack (62) to move downward, thereby closing the gate valve (1), and then the manual wheel (7) is pulled out to separate the connecting module (81) from the matching module (71); When the gate valve (1) is opened manually by means of a manual wheel (7), the manual wheel (7) is first pushed inward to connect the connecting module (81) with the matching module (71), and the manual wheel (7) is rotated in a second direction to drive the gear (61) to rotate through the gearbox (82), and the gear (61) drives the rack (62) to move upward, thereby opening the gate valve (1), and then the manual wheel (7) is pulled out to separate the connecting module (81) from the matching module (71).

7. The gate valve electro-hydraulic actuator according to claim 6, characterized in that: The force transmission component (8) further comprises an oil inlet lubricating sleeve (84), and the oil inlet lubricating sleeve (84) is connected to the connection module (81).

8. The gate valve electro-hydraulic actuator according to claim 7, characterized in that: The emergency pipeline (31) is provided with a handwheel hydraulic pipeline (85) connected to the force transmission component (8), and the handwheel hydraulic pipeline (85) is connected to the oil lubrication sleeve; when emergency cutting is performed, the hydraulic oil of the accumulator (3) enters the oil inlet lubrication sleeve (84) through the handwheel hydraulic pipeline (85), and then enters the connection module (81), and the connection module (81) and the matching module (71) are driven to separate under the pressure of the hydraulic oil.

9. The gate valve electro-hydraulic actuator according to claim 8, characterized in that: A connecting module oil chamber (87) is provided in the middle of the connecting module (81), a disengagement piston (89) is provided on the connecting module oil chamber (87), and the disengagement piston (89) cooperates with a support rod in the middle of the matching module (71); After the oil in the oil inlet sleeve (84) enters the oil chamber (87) of the connection module, the disengagement piston (89) is driven to extend and the matching module (71) is pushed to move, so that the fixing pin (88) and the pin hole are separated.

10. The gate valve electro-hydraulic actuator according to claim 9, characterized in that: A fixing flange (83) is provided on the outer sides of the connection module (81) and the oil inlet sleeve (84), and the fixing flange (83) is connected to the gearbox (82).

11. The gate valve electro-hydraulic actuator according to any one of claims 5 to 10, characterized in that: A supporting bracket (63) is arranged inside the intermediate bracket (6); One side of the rack (62) is provided with teeth and meshes with the gear (61); the other side is supported by the support bracket (63).

12. The gate valve electro-hydraulic actuator according to claim 11, characterized in that: The lower end of the rack (62) is connected to the valve stem (12) via a threaded sleeve (64).

13. The gate valve electro-hydraulic actuator according to claim 12, characterized in that: A position indicating nut (72) is arranged in the middle of the manual wheel (7).

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