Plug valve grease injection device

Abstract

The utility model discloses a plug valve grease injection device which is characterized in that a lower cylinder body is fixedly sleeved on the outer side of the bottom of an upper cylinder body and is hermetically communicated with the upper cylinder body, and a sealing grease cavity and a hydraulic oil cavity are respectively formed on the inner sides of the upper cylinder body and the lower cylinder body; the upper cylinder cover is arranged at the top of the upper cylinder body and seals the top opening of the sealing grease cavity; the two oil injection ports are formed in the outer side wall of the lower cylinder body and communicate with the top end and the bottom end of the hydraulic oil cavity correspondingly; the piston is of an inverted-T-shaped structure, the top end of the piston is in sealed sliding connection with the sealing grease cavity, and the bottom end is in sealed sliding connection with the hydraulic oil cavity; the displacement sensor is used for measuring the moving distance of the piston relative to the bottom end of the hydraulic oil cavity. According to the utility model, the position of the piston in the cylinder body is controlled through the cooperation of the displacement sensor and the hydraulic station, so that the precise control on the single-time grease injection amount and the grease storage amount is realized, the manual error and the workload in the grease injection operation are effectively reduced, and the grease injection efficiency and the grease injection quality are improved while the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of plug valves, and more specifically, to a grease injection device for plug valves. Background Art

[0002] A plug valve is a fast-opening straight-through valve that usually relies on direct contact between a precision-machined metal plug and the valve body to achieve sealing. It has a large opening and closing torque and is prone to wear. During use, sealing grease is usually injected between the valve body and the plug to form an oil film to ensure the sealing performance of the sealing surface and reduce wear.

[0003] At present, the most common method of greasing plug valves is to manually inject grease into the valve body with the help of conventional filling equipment such as grease guns. During use, the amount of grease injected into the valve body each time and the amount of grease remaining in the filling equipment can only be judged by the subjective experience of the staff. It is easy to cause problems such as under-injection, over-injection, insufficient grease in the filling equipment, and inability to refill in time, thereby affecting the grease injection efficiency and the service life of the plug valve. In addition, for working conditions where the plug valve is frequently operated (repeatedly opened and closed), the sealing grease in the valve body will be lost at a relatively fast rate. Accordingly, in order to ensure the sealing effect of the valve body cavity, the staff needs to continuously monitor the operation of the plug valve and frequently refill it with sealing grease. This refilling operation is cumbersome, highly repetitive, and labor-intensive, requiring a large amount of human resources and costs, and the grease injection efficiency and grease injection quality cannot be guaranteed.

[0004] In order to solve the above problems, it is necessary to design a plug valve grease injection device that reduces the labor cost of grease injection operation while ensuring grease injection efficiency and grease injection quality. Utility Model Content

[0005] The purpose of the utility model is to provide a plug valve grease injection device, which controls the position of the piston in the cylinder body through the cooperation of a controller, a displacement sensor and a hydraulic station, thereby achieving precise control of the single grease injection amount and the grease inventory in the device, effectively reducing manual errors and workload in the grease injection operation, and improving the grease injection efficiency and quality while reducing costs.

[0006] In order to achieve these purposes and other advantages according to the utility model, a plug valve grease injection device is provided, comprising:

[0007] The upper cylinder body and the lower cylinder body are both axially through-structured. The lower cylinder body is fixedly sleeved on the outer side of the bottom of the upper cylinder body and is sealed and connected thereto. The inner sides of the upper cylinder body and the lower cylinder body respectively form a sealing grease chamber and a hydraulic oil chamber.

[0008] an upper cylinder cover, which is arranged on the top of the upper cylinder body and closes the top opening of the sealing grease cavity; a grease injection hole is provided in the middle of the upper cylinder cover, which connects the sealing grease cavity with the valve body of the plug valve through a grease injection pipe;

[0009] Two oil filling ports are provided on the outer side wall of the lower cylinder body and are respectively connected to the top and bottom ends of the hydraulic oil chamber, and either oil filling port is connected to the hydraulic station through a hydraulic pipeline;

[0010] The piston is an inverted T-shaped structure, with its top end sealingly and slidingly connected to the sealing grease cavity and its bottom end sealingly and slidingly connected to the hydraulic oil cavity;

[0011] a displacement sensor disposed at the bottom opening of the hydraulic oil chamber and sealed thereat, the displacement sensor being configured to measure a movement distance of the piston relative to the bottom end of the hydraulic oil chamber;

[0012] A controller is electrically connected to the displacement sensor and the hydraulic station respectively.

[0013] Preferably, the plug valve grease injection device further includes a sealing assembly, which includes a first sealing assembly configured to seal the gap between the upper cylinder cover and the upper cylinder body; a second sealing assembly configured to seal the gap between the upper cylinder body and the lower cylinder body; a third sealing assembly configured to seal the gap between the piston and the sealing grease chamber; and a fourth sealing assembly configured to seal the gap between the piston and the hydraulic oil chamber.

[0014] Wherein, the second sealing component, the third sealing component and the fourth sealing component are a double sealing structure.

[0015] Preferably, in the plug valve grease injection device, the upper cylinder cover is threadedly connected to the upper cylinder body, and a plurality of handles are provided on the outer side wall of the upper cylinder cover at intervals along the circumferential direction, and any handle extends radially outwardly along the upper cylinder cover.

[0016] Preferably, in the plug valve grease injection device, a mounting groove is provided at the bottom of the piston, which extends along the length direction of the piston to its upper part; the displacement sensor is a linear displacement sensor, the head end of its slide rail is fixed to the bottom of the lower cylinder body and closes the bottom opening of the hydraulic oil chamber, the tail end of the slide rail is upwardly inserted into the mounting groove, and the sliding part on the slide rail is fixedly connected to the bottom end of the piston.

[0017] Preferably, the plug valve grease injection device and the outer side of the slide rail head end of the linear displacement sensor are provided with a protective cover.

[0018] Preferably, the plug valve grease injection device also includes a mounting bracket, which is supported on the bottom of the lower cylinder body, and the mounting bracket includes a bottom plate, which is fixedly connected to the bottom surface of the lower cylinder body and has a mounting hole in the middle for the displacement sensor to pass through; a connecting plate, which is an inverted L-shaped structure, one end of its horizontal part is fixedly connected to the vertical part, and the other end is fixedly connected to one side of the bottom plate; a base, which is fixedly connected to the vertical part of the connecting plate.

[0019] The utility model has at least the following beneficial effects:

[0020] The utility model controls the position of the piston in the cylinder body by cooperating with the controller, displacement sensor and hydraulic station, thereby realizing real-time and accurate judgment and control of the single grease injection amount and the grease stock in the device, effectively reducing the manual error and workload in the grease injection operation, and improving the grease injection efficiency and quality while reducing costs.

[0021] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a plug valve grease injection device according to one embodiment of the present utility model;

[0023] Figure 2 AA is a schematic cross-sectional structural diagram of the plug valve grease injection device described in the above embodiment.

[0024] Description of reference numerals:

[0025] 1. Upper cylinder body; 2. Lower cylinder body; 3. Upper cylinder cover; 31. Grease injection connector; 32. Exhaust valve; 33. Handle; 4. Piston; 5. Sealing grease chamber; 6. Hydraulic oil chamber; 71. Displacement sensor; 72. Protective cover; 81. First oil filling port; 82. Second oil filling port; 91. Bottom plate; 92. Connecting plate; 93. Base; 94. Support plate. DETAILED DESCRIPTION

[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0027] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "horizontal", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying 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 operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0028] like Figure 1-2 As shown, the utility model provides a plug valve grease injection device, comprising:

[0029] The upper cylinder body 1 and the lower cylinder body 2 are both axially through-structured. The lower cylinder body 2 is fixedly sleeved on the outer side of the bottom of the upper cylinder body 1 and is sealed and connected thereto. A sealing grease chamber 5 and a hydraulic oil chamber 6 are formed inside the upper cylinder body 1 and the lower cylinder body 2, respectively.

[0030] An upper cylinder cover 3 is provided on the top of the upper cylinder body 1 and closes the top opening of the sealing grease chamber 5. A grease injection hole is provided in the middle of the upper cylinder cover 3, which connects the sealing grease chamber 5 with the valve body of the plug valve through a grease injection pipe;

[0031] Two oil filling ports, which are provided on the outer side wall of the lower cylinder body 2 and are respectively connected to the top and bottom ends of the hydraulic oil chamber 6, and either oil filling port is connected to the hydraulic station through a hydraulic pipeline;

[0032] The piston 4 is an inverted T-shaped structure, with its top end sealingly and slidingly connected to the sealing grease chamber 5 and its bottom end sealingly and slidingly connected to the hydraulic oil chamber 6;

[0033] a displacement sensor 71 , which is disposed at the bottom opening of the hydraulic oil chamber 6 and is sealed, and the displacement sensor 71 is configured to measure a movement distance of the piston 4 relative to the bottom end of the hydraulic oil chamber 6 ;

[0034] A controller is electrically connected to the displacement sensor 71 and the hydraulic station respectively.

[0035] In the above technical solution, the inner cavities of the lower cylinder body 2 and the upper cylinder body 1 are interconnected and the inner cavity diameter of the lower cylinder body is larger than the inner cavity diameter of the upper cylinder body, forming a step-type cavity inside the grease injection device (cylinder body). The upper cylinder cover 3 and the displacement sensor 71 respectively close the top and bottom openings of the step-type cavity, making the interior completely sealed. The piston 4 is an inverted T-shaped structure, with its wider end located in the inner cavity of the lower cylinder body 2 and its narrower end located in the inner cavity of the upper cylinder body 1. The two ends of the piston 4 are respectively slidably connected with the inner cavities of the upper cylinder body and the lower cylinder body and close their cross sections, thereby dividing the step-type cavity from top to bottom into three cavities, which are respectively located above the piston, below the piston, and between the top and bottom ends of the piston. During the grease injection preparation stage, the upper cylinder cover 3 is opened and sealing grease is injected into the sealing grease cavity 5 from the outside. Under the obstruction of the piston, the sealing grease is stored in the cavity above the piston and will not flow downward. At this time, the piston is in the initial position, that is, the bottom end of the piston is close to the bottom end of the inner cavity of the lower cylinder body, the top end of the piston is located at the bottom of the upper cylinder body, and the indication of the displacement sensor 71 is adjusted to zero. After the upper cylinder cover 3 is reinstalled, the grease injection can be officially started. The wide end (bottom end) of the piston 4 divides the hydraulic oil chamber 6 into two parts, the upper and lower parts. The oil filling port is an L-shaped channel structure, the vertical part of which is connected to the top / bottom surface of the hydraulic oil chamber, and the horizontal part extends outward to the outer wall of the lower cylinder body and is connected to the hydraulic pipeline. The oil filling port located at the top of the hydraulic oil chamber 6 is the first oil filling port 81, and the oil filling port located at the bottom end of the hydraulic oil chamber 6 is the second oil filling port 82. Therefore, the first oil filling port 81 is always connected to the upper hydraulic oil chamber, and the second oil filling port 82 is always connected to the lower hydraulic oil chamber. By controlling the oil filling situation of the hydraulic station to the two oil filling ports, the displacement of the piston in the step-type cavity can be controlled. A displacement sensor 71 is provided at the bottom of the hydraulic oil chamber 6. By reading the real-time measurement data from the displacement sensor, the controller can determine the distance the piston 4 has moved relative to the bottom of the hydraulic oil chamber 6. Combined with the dimensions of the sealing grease chamber, the controller can calculate the amount of sealing grease injected into the plug valve through the grease injection hole and grease injection tube, as well as the amount of sealing grease remaining in the sealing grease chamber (the total sealing grease capacity when the piston is at zero position minus the amount of sealing grease injected). This allows the controller to control the operating status of the hydraulic station (i.e., the oil filling status of the two oil injection ports) based on the real-time data fed back by the displacement sensor, thereby precisely controlling the amount of sealing grease injected per injection and determining whether the remaining sealing grease in the grease injection device meets the requirements for the next injection (if the remaining sealing grease is less than the requirements for a single injection, the controller switches back to the grease preparation stage and fills the sealing grease chamber). This facilitates the smooth and efficient execution of subsequent refilling operations. Furthermore, an exhaust valve 32 is provided on one side of the upper cylinder head 3, which communicates with the grease injection hole via an exhaust hole to facilitate the normal grease injection and refilling operations.

[0036] Specifically, before grease injection begins, the single grease injection amount is set in advance according to the grease injection demand of the plug valve, and the required moving distance of the piston in the sealing grease chamber is calculated based on the grease injection amount; when grease injection starts, the exhaust valve 32 is opened, and the hydraulic station is controlled to inject hydraulic oil into the hydraulic oil chamber 6 from the second oil injection port 82, pushing the piston 4 upward. The piston 4 squeezes the sealing grease in the sealing grease chamber 5 located above, so that it enters the plug valve body through the grease injection hole and the grease injection pipe. At this time, the liquid in the upper hydraulic oil chamber can be discharged through the first oil injection port 81 or the corresponding oil outlet (which is arranged on the side wall of the lower cylinder body at a distance from the oil injection port and connects the hydraulic oil chamber with the hydraulic pipeline). When the displacement sensor 71 detects that the piston 4 has moved up a set distance (the required moving distance of the piston in the sealing grease chamber), the second oil injection port 82 no longer takes in oil, and the exhaust valve 32 is closed, thus completing the single grease injection operation.

[0037] Before the refilling operation, first confirm the current refilling requirements (the amount of grease injected and the corresponding piston movement distance), and judge whether the remaining sealing grease in the grease injection device meets the refilling requirements based on the historical detection data of the displacement sensor. After confirming that the amount of sealing grease in the sealing grease chamber meets the current refilling requirements, inject hydraulic oil into the hydraulic oil chamber 6 from the second oil filling port 82 again to push the piston 4 to continue to move upward and refill the sealing grease into the plug valve. When the piston moves the set distance, the second oil filling port 82 stops taking oil, and the refilling operation is completed. When the amount of remaining sealing grease is less than the single greasing requirement, open the exhaust valve 32, control the hydraulic station to inject hydraulic oil into the hydraulic oil chamber 6 from the first oil filling port 81, and push the piston 4 downward to reset (to the initial position). At this time, the liquid in the lower hydraulic oil chamber can be discharged through the second oil filling port 82 or the corresponding oil outlet (set on the side wall of the lower cylinder body at a distance from the oil filling port, and connecting the hydraulic oil chamber and the hydraulic pipeline). After the piston is reset, switch to the greasing preparation stage again, open the upper cylinder cover 3 to fill the sealing grease chamber 5 with sealing grease, and then carry out subsequent filling operations.

[0038] The utility model controls the position of the piston in the cylinder body through the cooperation of the controller, the displacement sensor and the hydraulic station, thereby realizing real-time and accurate judgment and control of the single grease injection amount and the grease stock in the device. The actions of grease injection and refilling are mainly completed by the cooperation of various components in the controller control device, and manual labor only plays an auxiliary judgment role, effectively reducing the manual error and workload in the grease injection operation, improving the grease injection efficiency and grease injection quality while reducing labor costs, and solving the problems of serious waste of sealing grease and low grease injection efficiency in the grease injection operation of the plug valve in the prior art.

[0039] In another technical solution, the plug valve grease injection device further includes a sealing assembly, which includes a first sealing assembly configured to close the gap between the upper cylinder cover 3 and the upper cylinder body 1; a second sealing assembly configured to close the gap between the upper cylinder body 1 and the lower cylinder body 2; a third sealing assembly configured to close the gap between the piston 4 and the sealing grease chamber 5; and a fourth sealing assembly configured to close the gap between the piston 4 and the hydraulic oil chamber 6.

[0040] Wherein, the second sealing component, the third sealing component and the fourth sealing component are a double sealing structure.

[0041] In the above technical solution, each sealing assembly can adopt conventional sealing elements (such as sealing rings, sealing rings, etc.) to seal the corresponding components and avoid leakage of the medium in the sealing cavity (sealing grease cavity, hydraulic oil cavity) or mixing of the medium between adjacent cavities, which affects the normal operation of the grease injection device. A double sealing structure is adopted between the upper cylinder body and the lower cylinder body, between the piston and the sealing grease cavity (upper cylinder body), and between the piston and the hydraulic oil cavity (lower cylinder body) to ensure the sealing effect. Specifically, the first sealing assembly includes a first sealing ring, which is embedded in the lower outer side of the upper cylinder head (fixed relative to the upper cylinder head); the second sealing assembly includes two second sealing rings, which are spaced apart at the bottom of the upper cylinder body, and any second sealing ring is circumferentially sleeved on the outer side wall of the upper cylinder body; the third sealing assembly includes two third sealing rings, which are spaced apart at the top of the piston, and any third sealing ring is circumferentially sleeved on the outer side wall of the piston and moves synchronously with it; the fourth sealing assembly includes two fourth sealing rings, which are spaced apart at the bottom of the piston, and any fourth sealing ring is circumferentially sleeved on the outer side wall of the piston and moves synchronously with it.

[0042] In another technical solution, the plug valve grease injection device, the upper cylinder cover 3 is threadedly connected to the upper cylinder body 1, and a plurality of handles 33 are provided on the outer wall of the upper cylinder cover 3 at intervals along the circumference, and any handle extends radially outward from the upper cylinder cover 3. Specifically, the upper cylinder cover 3 and the upper cylinder body 1 are detachably connected, the lower outer periphery of the upper cylinder cover 3 is provided with an external thread, and the top inner periphery of the upper cylinder body 1 is provided with an internal thread. The upper cylinder cover and the upper cylinder body can be quickly disassembled and assembled by rotating the handle 33 (clockwise / counterclockwise). A grease injection connector 31 is installed at the top opening of the grease injection hole, one end of which is fixedly connected to the upper cylinder cover 3 (grease injection hole), and the other end extends outward (upward) a distance from the grease injection hole to facilitate the subsequent docking and installation of the grease injection pipe. The exhaust hole is provided in the middle of the grease injection hole and is connected radially outward, and the exhaust valve 32 is installed at the outer end of the exhaust hole. In this embodiment, the exhaust valve may be an automatic exhaust valve, and the on-off adjustment of the exhaust valve can be achieved by adjusting the tightness of the exhaust valve nut.

[0043] In another technical solution, the bottom of the piston 4 in the plug valve grease injection device is provided with a mounting groove extending along the length of the piston to its upper portion. The displacement sensor 71 is a linear displacement sensor, the head end of which is fixed to the bottom of the lower cylinder body and closes the bottom opening of the hydraulic oil chamber. The tail end of the slide rail extends upward into the mounting groove, and a sliding portion on the slide rail is fixedly connected to the bottom end of the piston. The measurement principle of the linear displacement sensor is similar to that of a sliding rheostat, and the displacement of the sliding portion is measured by reading the electrical signal generated by the displacement of the sliding portion (slider, slider) on the slide rail. In the above technical solution, the piston is configured as a hollow structure, providing installation space within the cavity for the linear displacement sensor's slide rail without affecting the piston's movement. The bottom end of the piston is fixedly connected to the sliding portion, and the lower limit of the piston's movement within the hydraulic oil cavity is used as the zero position of the linear displacement sensor. When the piston moves upward (away from the zero position) under the pressure of the hydraulic oil, the output current of the displacement sensor increases, and when it moves downward (closer to the zero position), the output current of the displacement sensor decreases. The controller converts the real-time current data of the displacement sensor into piston position data to accurately determine the real-time position of the piston and, therefore, the current actual grease injection amount. In addition, based on the grease injection data (the sum of the piston displacement) after the most recent grease injection preparation stage (filling the grease cavity with grease), the total amount of grease output from the grease cavity from the filling state to the current moment can be calculated, thereby calculating the current remaining grease inventory in the grease cavity.

[0044] In this embodiment, the linear displacement sensor can be a magnetostrictive displacement sensor, which includes a measuring rod, an electronic compartment, and a magnetic ring. The electronic compartment is fixed to the end of the measuring rod, and the magnetic ring slides non-contact along the length of the measuring rod. The bottom surface of the lower cylinder body is perforated, and the measuring rod of the magnetostrictive displacement sensor penetrates the hydraulic oil chamber from the outside to the inside, so that the electronic compartment is fixed to the bottom opening of the hydraulic oil chamber and seals it, facilitating electrical connection between the electronic compartment and the controller. The magnetic ring is fixedly connected to the bottom end of the piston. Therefore, when the piston moves, the real-time position of the piston can be determined by reading the moving position of the magnetic ring on the measuring rod.

[0045] In another technical solution, the plug valve grease injection device is provided with a protective cover 72 on the outside of the slide rail head end of the linear displacement sensor. In the above technical solution, the slide rail head end of the linear displacement sensor closes the bottom opening of the hydraulic oil chamber 6 and extends out of the lower cylinder body 2. The electronic components of the sensor are usually integrated and arranged at this end. On the one hand, it is not easily affected by the medium (hydraulic oil) and pressure in the hydraulic oil chamber. On the other hand, it is convenient to connect with the external controller to transmit electrical signals. The protective cover 72 is additionally provided at the above-mentioned slide rail head end so that it is sleeved on the outside of each electronic component of the sensor, which can further play a protective role, avoid the electronic components from being bumped, water ingress, etc., and ensure the normal, long-term and stable operation of the linear displacement sensor.

[0046] In another technical solution, the plug valve grease injection device further includes a mounting bracket supported on the bottom of the lower cylinder body 2. The mounting bracket includes a bottom plate 91, which is fixedly connected to the bottom surface of the lower cylinder body 2 and has a mounting hole in the middle for the displacement sensor 71 to pass through; a connecting plate 92, which is an inverted L-shaped structure, with one end of its horizontal portion fixedly connected to the vertical portion and the other end fixedly connected to one side of the bottom plate 91; and a base 93, which is fixedly connected to the vertical portion of the connecting plate 92. The displacement sensor 71 forms a protrusion at the bottom of the lower cylinder body 2, and the additional mounting bracket at the bottom of the lower cylinder body 2 can stably support the lower cylinder body 2 to a certain height without interfering with the displacement sensor 71. The bottom plate 91 is horizontally arranged at the bottom of the lower cylinder body, and the horizontal part of the connecting plate 92 is supported parallel to the bottom of the bottom plate 91. A support plate 94 is fixed between the horizontal part and the vertical part of the connecting plate 92. It is a triangular support structure for improving the support stability of the connecting plate. The structure of the base 93 can be adapted according to the installation position of the plug valve grease injection device. If the grease injection device is installed on a vertical surface (inherent structure), the base can be set as a vertical plate structure to fix the connecting plate to the inherent structure. If the grease injection device is installed on a horizontal surface (inherent structure), the base can be set as a horizontal plate structure to stably connect the bottom of the connecting plate to the inherent structure. In this embodiment, the base adopts a vertical plate structure, and a plurality of positioning holes are provided on the plate surface at intervals. A plurality of positioning grooves are provided on the vertical part of the connecting plate. By using bolts to pass through the corresponding positioning grooves and positioning holes in sequence, a flexible positioning connection between the connecting plate and the base can be achieved.

[0047] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with this field, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A plug valve grease injection device, characterized in that: include: The upper cylinder body and the lower cylinder body are both axially through-structured. The lower cylinder body is fixedly sleeved on the outer side of the bottom of the upper cylinder body and is sealed and connected thereto. The inner sides of the upper cylinder body and the lower cylinder body respectively form a sealing grease chamber and a hydraulic oil chamber. an upper cylinder cover, which is arranged on the top of the upper cylinder body and closes the top opening of the sealing grease cavity; a grease injection hole is provided in the middle of the upper cylinder cover, which connects the sealing grease cavity with the valve body of the plug valve through a grease injection pipe; Two oil filling ports are provided on the outer side wall of the lower cylinder body and are respectively connected to the top and bottom ends of the hydraulic oil chamber, and either oil filling port is connected to the hydraulic station through a hydraulic pipeline; The piston is an inverted T-shaped structure, with its top end sealingly and slidingly connected to the sealing grease cavity and its bottom end sealingly and slidingly connected to the hydraulic oil cavity; a displacement sensor disposed at the bottom opening of the hydraulic oil chamber and sealed thereat, the displacement sensor being configured to measure a movement distance of the piston relative to the bottom end of the hydraulic oil chamber; A controller is electrically connected to the displacement sensor and the hydraulic station respectively.

2. The plug valve grease injection device according to claim 1, characterized in that: The invention also includes a sealing assembly, which includes a first sealing assembly configured to close the gap between the upper cylinder head and the upper cylinder body; a second sealing assembly configured to close the gap between the upper cylinder body and the lower cylinder body; a third sealing assembly configured to close the gap between the piston and the sealing grease chamber; and a fourth sealing assembly configured to close the gap between the piston and the hydraulic oil chamber. Wherein, the second sealing component, the third sealing component and the fourth sealing component are a double sealing structure.

3. The plug valve grease injection device according to claim 1, characterized in that: The upper cylinder cover is threadedly connected to the upper cylinder body. A plurality of handles are provided on the outer side wall of the upper cylinder cover at intervals along the circumferential direction, and any handle extends outward in the radial direction of the upper cylinder cover.

4. The plug valve grease injection device according to claim 1, characterized in that: A mounting groove is provided at the bottom of the piston, which extends to the upper part of the piston along the length direction of the piston; the displacement sensor is a linear displacement sensor, the head end of its slide rail is fixed to the bottom of the lower cylinder body and closes the bottom opening of the hydraulic oil chamber, the tail end of the slide rail is inserted upward into the mounting groove, and the sliding part on the slide rail is fixedly connected to the bottom end of the piston.

5. The plug valve grease injection device according to claim 4, characterized in that: A protective cover is provided on the outer side of the slide rail head end of the linear displacement sensor.

6. The plug valve grease injection device according to claim 1, characterized in that: It also includes a mounting bracket, which is supported on the bottom of the lower cylinder body. The mounting bracket includes a bottom plate, which is fixedly connected to the bottom surface of the lower cylinder body and has a mounting hole in the middle for the displacement sensor to pass through; a connecting plate, which is an inverted L-shaped structure, one end of its horizontal part is fixedly connected to the vertical part, and the other end is fixedly connected to one side of the bottom plate; and a base, which is fixedly connected to the vertical part of the connecting plate.

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