A special tool for dismounting and mounting the inlet and outlet one-way valves of a reciprocating plunger pump of a drilling platform

Abstract

The utility model provides a kind of special tool for dismounting and assembling one-way valve of reciprocating plunger pump import and export of drilling platform, belong to petroleum chemical industry, environmental protection treatment and dangerous waste disposal field, including positioning dog mechanism and special three-jaw main body, the upper end of positioning dog mechanism is connected with screw rod, ring handle in proper order, the lower end of positioning dog mechanism and special three-jaw main body are detachably connected, nut and support disc are set on screw rod, while nut and screw rod are threadedly connected, support disc can move along screw rod axial direction;Positioning dog mechanism includes concentric guide cylinder, eccentric dog cylinder and hexagonal head cylinder, concentric guide cylinder and eccentric dog cylinder are respectively set on the cylinder of hexagonal head cylinder, while concentric guide cylinder and eccentric dog cylinder can respectively move along cylinder and screw rod axial direction, and eccentric dog cylinder is arranged below concentric guide cylinder.The utility model is simple in structure, light and easy to operate, accurate in positioning, and can effectively improve dismounting and assembling maintenance efficiency.

Description

Technical Field

[0001] This utility model relates to the fields of petrochemicals, environmental protection and hazardous waste disposal, and in particular to a special tool for disassembling and assembling the inlet and outlet check valves of a reciprocating plunger pump on a drilling platform. Background Technology

[0002] In the operation of offshore drilling platforms, the closed-loop drainage system is a core facility for ensuring safety and environmental protection, and is responsible for the collection and treatment of oily wastewater. The reciprocating plunger pump check valve of the closed-loop drainage system is an important component, and its daily maintenance is a necessary link to ensure the efficient operation of the system.

[0003] Currently, traditional specialized tools used for disassembling and assembling check valves have significant drawbacks: the tools are bulky and difficult to move within the limited space of a platform; due to the lack of precise positioning and labor-saving structures, the need to simultaneously consider alignment, force application, and fixation leads to complex operation procedures, requiring multiple people to complete the disassembly and assembly work, which not only increases labor costs but also results in low maintenance efficiency; and because the traditional specialized tools are time-consuming and easily damage the valve sealing surfaces, they may increase the risk of pollutant leakage, posing a potential threat to safety and environmental protection. Utility Model Content

[0004] In view of this, the present invention aims to propose a special tool for disassembling and assembling the inlet and outlet check valves of the reciprocating plunger pump of the drilling and production platform, which is lightweight, combinable and detachable, and has precise positioning. This tool can solve the technical problems of the existing tools for disassembling and assembling the check valves of the reciprocating plunger pump of the closed drainage system of the drilling and production platform, which are heavy, complicated to operate, have precise positioning, and low maintenance efficiency. It can achieve convenient operation by a single person, improve maintenance efficiency, and reduce safety and environmental risks.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: A special tool for disassembling and assembling the inlet and outlet check valves of a reciprocating plunger pump for a drilling platform includes a screw, a nut, a support disc, a lifting ring handle, a positioning claw mechanism, and a special three-jaw body. The upper end of the positioning claw mechanism is sequentially connected to the screw and the lifting ring handle, and the lower end of the positioning claw mechanism is detachably connected to the special three-jaw body. The screw is fitted with a nut and a support disc, and the nut and the screw are threadedly connected. The support disc can move along the axial direction of the screw. The positioning jaw mechanism includes a concentric guide cylinder, an eccentric jaw cylinder, and a hexagonal head cylinder. The concentric guide cylinder and the eccentric jaw cylinder are respectively sleeved on the body of the hexagonal head cylinder. At the same time, the concentric guide cylinder and the eccentric jaw cylinder can move axially along the body and the screw respectively, and the eccentric jaw cylinder is located below the concentric guide cylinder.

[0006] Furthermore, the central axes of the screw, the concentric guide cylinder, and the hexagonal head cylinder coincide.

[0007] Furthermore, the dedicated three-jaw body includes a three-jaw structure, a round hole structure, a hexagonal head hole, and a hexagonal groove. The upper end of the three-jaw structure is provided with a hexagonal groove that matches the head of the hexagonal cylinder. The upper end of the hexagonal groove is provided with a round hole structure that is tangent to it. The hexagonal head hole is provided above the round hole structure. The hexagonal head hole, the round hole structure, and the hexagonal groove are coaxially arranged. At the same time, the cross-sectional shape of the hexagonal head hole is the same as the cross-sectional shape of the hexagonal groove, and the cross-sectional projection of the hexagonal head hole and the cross-sectional projection of the hexagonal groove are rotated and offset around the axis of the hexagonal head hole.

[0008] Furthermore, the cross-sectional shape of both the hexagonal head hole and the hexagonal groove is a regular hexagon; the cross-sectional projection of the circular hole structure is a circle, and the circle of the cross-sectional projection of the circular hole structure is circumscribed by the regular hexagon of the cross-sectional projection of the hexagonal groove.

[0009] Furthermore, a washer is provided between the nut and the support disc, the washer is fitted onto the stud, and the washer can move up and down along the stud.

[0010] Furthermore, the diameters of the circumscribed circle of the hexagonal head cylinder, the concentric guide cylinder, and the eccentric claw cylinder are all equal; When the concentric guide cylinder moves into the valve seat orifice of the check valve to be disassembled, a gap is provided between the outer wall of the concentric guide cylinder and the inner wall of the valve seat orifice. When the eccentric claw cylinder is located inside the valve seat orifice of the check valve to be disassembled, a gap is provided between the outer wall of the eccentric claw cylinder and the inner wall of the valve seat orifice.

[0011] Furthermore, a first through hole is provided on the concentric guide cylinder, the center of the first through hole being concentric with the center of the concentric guide cylinder, and a second through hole is provided on the eccentric claw cylinder, the center of the second through hole being offset from the center of the eccentric claw cylinder.

[0012] Furthermore, the furthest distance from the central axis of the second through hole to the outer wall of the eccentric claw cylinder is greater than the valve hole radius of the one-way valve seat.

[0013] Compared with existing technologies, the special tool for disassembling and assembling the inlet and outlet check valves of a reciprocating plunger pump for a drilling platform described in this utility model has the following advantages: (1) The operation of this utility model is stable and controllable. The tension applied by rotating the nut is uniform, which can prevent the one-way valve and surrounding parts from being damaged by force impact and protect the integrity of the equipment. (2) This utility model has a simple and lightweight structure, and can be operated by a single person without the need for additional manpower, thus effectively saving labor costs; (3) This utility model transmits tensile force through mechanical structure, and the positioning is accurate (such as using concentric guide cylinders to ensure coaxiality), which can effectively and stably hold the valve seat and reduce operational errors; (4) This utility model is applicable to drilling and production platform environments with narrow spaces. The operation process is simple, and disassembly and assembly can be completed quickly, improving maintenance efficiency and reducing safety and environmental risks. (5) This utility model uses a special three-claw body and a hexagonal cylindrical assembly to assemble and disassemble the valve cap, which is simple and lightweight; (6) The head of the hexagonal cylinder and the eccentric claw cylinder pass through the round hole of the valve seat in sequence. Under the accurate positioning of the concentric guide cylinder, the eccentric claw cylinder can hold the bottom of the valve seat. At the same time, the nut of the rotating linear motion mechanism of the rotating nut presses the support disc. Then the screw can be lifted to pull out the one-way valve. Its operation is simplified and the positioning is accurate, which can effectively improve the efficiency of disassembly and maintenance. Attached Figure Description

[0014] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 A schematic diagram of a special tool for disassembling and assembling the inlet and outlet check valves of a reciprocating plunger pump on a drilling and production platform. Figure 2 A front view of a special tool for disassembling and assembling the inlet and outlet check valves of a reciprocating plunger pump on a drilling and production platform. Figure 3 A top view of concentric guide cylinders; Figure 4 This is a top view of an eccentric jaw cylinder; Figure 5 This is a schematic diagram of the positioning gripper mechanism; Figure 6 A schematic diagram of the structure of the dedicated three-claw main body (top right view); Figure 7 A schematic diagram of the structure of the dedicated three-claw main body (bottom right view); Figure 8 Front view of the dedicated three-claw body; Figure 9 for Figure 8 AA section view in the middle; Figure 10 This is a schematic diagram of a one-way valve.

[0015] Explanation of reference numerals in the attached figures: 1. Screw; 2. Nut; 3. Support disc; 4. Concentric guide cylinder; 5. Eccentric claw cylinder; 6. Lifting ring handle; 7. Hexagonal head cylinder; 8. Special three-jaw body; 9. Gasket; 10. Three-jaw structure; 11. Round hole structure; 12. Hexagonal head hole; 13. Hexagonal groove; 14. Groove bottom; 15. Column; 16. Column head; 17. First through hole; 18. Second through hole; 19. Valve cap; 20. Spring; 21. Valve core; 22. Valve seat. Detailed Implementation

[0016] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0017] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] like Figures 1-10 As shown, this utility model is a special tool for disassembling and assembling the inlet and outlet check valves of a reciprocating plunger pump on a drilling platform. It includes a main structural component and a dedicated three-jaw body 8, which are detachably connected. After assembly, the main structural component and the dedicated three-jaw body 8 are used to disassemble the valve cap 19 of the check valve. After separation, the main structural component alone is used to disassemble the valve seat 22 of the check valve. The main structural component includes a nut 2 rotary linear motion mechanism and a positioning jaw mechanism. The nut 2 rotary linear motion mechanism includes a screw 1, a nut 2, a support disc 3, a lifting ring handle 6, and a washer 9. The positioning jaw mechanism includes a concentric guide cylinder 4, an eccentric jaw cylinder 5, and a hexagonal head cylinder 7. Specifically: The positioning jaw mechanism includes a concentric guide cylinder 4, an eccentric jaw cylinder 5, and a hexagonal head cylinder 7. The concentric guide cylinder 4 and the eccentric jaw cylinder 5 are respectively sleeved on the column body 15 of the hexagonal head cylinder 7. The upper end of the column body 15 is connected to a stud. The outer diameter of the column body 15 is equal to the outer diameter of the stud, and the connection surface between the two is smoothed. The concentric guide cylinder 4 and the eccentric jaw cylinder 5 can move axially along the column body 15 and the screw 1, respectively, and the eccentric jaw cylinder 5 is located below the concentric guide cylinder 4. Preferably, the central axes of the screw 1, the concentric guide cylinder 4, and the hexagonal head cylinder 7 coincide, and the outer diameter of the screw 1 is the same as the outer diameter of the column body 15 of the hexagonal head cylinder 7. A first through hole 17 is provided on the concentric guide cylinder 4, and the center of the first through hole 17 is concentric with the center of the concentric guide cylinder 4. A second through hole 18 is provided on the eccentric claw cylinder 5, and the center of the second through hole 18 is offset from the center of the eccentric claw cylinder 5. The farthest distance from the central axis of the second through hole 18 to the outer wall of the eccentric claw cylinder 5 is greater than the valve hole radius of the one-way valve seat 22, thereby ensuring that the eccentric claw cylinder 5 can lock the bottom of the one-way valve seat 22 when it moves to the lower end of the one-way valve seat 22. In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0019] The upper end of the hexagonal cylinder 7 is connected to a screw 1 and a lifting ring handle 6 in sequence. The lower end of the hexagonal cylinder 7 is detachably connected to a special three-jaw body 8. A nut 2 and a support disc 3 are fitted on the screw 1. The nut 2 and the screw 1 are threaded together. The center hole of the support disc 3 is a smooth hole. A gap is provided between the center hole of the support disc 3 and the outer wall of the screw 1, so that the support disc 3 can move along the axial direction of the screw 1. Preferably, a washer 9 is provided between the nut 2 and the support disc 3. The washer 9 is fitted on the stud and can move up and down along the stud.

[0020] The dedicated three-jaw body 8 includes a three-jaw structure 10, a round hole structure 11, a hexagonal head hole 12, and a hexagonal groove 13; the lower end of the dedicated three-jaw body 8 is provided with the three-jaw structure 10, such as... Figure 7 and Figure 10As shown, the shape of the three-jaw structure 10 is adapted to the valve cap 19 of the one-way valve. The upper end of the three-jaw structure 10 is provided with a hexagonal groove 13 that matches the head 16 of the hexagonal cylinder 7. The upper end of the hexagonal groove 13 is provided with a circular hole structure 11 tangent to it, ensuring that the hexagonal head 16 of the hexagonal cylinder 7 can rotate within the circular hole structure 11 and smoothly descend into the hexagonal groove 13 to engage with it. A hexagonal head hole 12 is provided above the circular hole structure 11. The hexagonal head hole 12, the circular hole structure 11, and the hexagonal groove 13 are coaxially arranged, i.e., six... The circumcircle of the corner groove 13, the circumcircle of the hexagonal head hole 12, and the center of the circular hole structure 11 are all on the same axis. At the same time, the cross-sectional shape of the hexagonal head hole 12 is the same as that of the hexagonal groove 13, and the cross-sectional projection of the hexagonal head hole 12 and the cross-sectional projection of the hexagonal groove 13 are rotated around the axis of the hexagonal head hole 12. That is, the hexagonal head hole 12 is equivalent to being rotated at a certain angle in the original position of the hexagonal groove 13, so that the edges of the two do not overlap in the horizontal projection. The hexagonal head hole 12 and the hexagonal groove 13 are misaligned, which facilitates the operator in lifting the dedicated three-jaw body 8. Specifically, in actual application, the hexagonal head 16 of the hexagonal cylinder 7 first passes through the hexagonal head hole 12 and then is lowered into the circular hole structure 11. At this time, due to the misalignment between the hexagonal groove 13 and the hexagonal head hole 12, the head 16 of the hexagonal cylinder 7 cannot be lowered further into the hexagonal groove 13. At this point, the hexagonal cylinder 7 is rotated to a certain angle so that the directions of each side of the head 16 are aligned with those of the hexagonal groove 13, and then the head 16 can be lowered into the hexagonal groove. When the hexagonal head cylinder 7 is rotated, the dedicated three-jaw body 8 will rotate synchronously. If the hexagonal head cylinder 7 is lifted by the lifting ring handle 6, the head 16 of the hexagonal head cylinder 7 will dislodge from the hexagonal groove 13 and move upward into the circular hole structure 11. Since the sides of the hexagonal hole 12 and the hexagonal groove 13 are not aligned, the hexagonal hole 12 will limit the head 16, thus preventing the head 16 of the hexagonal head cylinder 7 from dislodging from the dedicated three-jaw body 8. Then, by lifting the lifting ring handle 6, the dedicated three-jaw body 8 can be lifted synchronously.

[0021] The cross-sectional shape of the hexagonal head hole 12 and the hexagonal groove 13 is a regular hexagon; the cross-sectional projection of the circular hole structure 11 is a circle, and the circle of the cross-sectional projection of the circular hole structure 11 is circumscribed by the regular hexagon of the cross-sectional projection of the hexagonal groove 13.

[0022] The diameters of the circumscribed circle of the hexagonal head 16 of the hexagonal cylinder 7, the concentric guide cylinder 4, and the eccentric claw cylinder 5 are all equal. When the concentric guide cylinder 4 moves into the valve seat 22 orifice of the check valve to be disassembled, a gap is provided between the outer wall of the concentric guide cylinder 4 and the inner wall of the valve seat 22 orifice. When the eccentric claw cylinder 5 is located in the valve seat 22 orifice of the check valve to be disassembled, a gap is provided between the outer wall of the eccentric claw cylinder 5 and the inner wall of the valve seat 22 orifice. All three components can cooperate to pass through the valve seat 22 orifice of the check valve, satisfying the requirements of positioning by the concentric guide cylinder 4 and locking of the eccentric claw cylinder 5 into the valve seat 22. Specifically, the diameter of the concentric guide cylinder 4 is slightly smaller than the orifice diameter of the valve seat 22, and the maximum distance between the outer wall of the concentric guide cylinder 4 and the outer wall of the eccentric claw cylinder 5 is smaller than the orifice diameter of the valve seat 22. In practical applications, when it is necessary to disassemble the valve seat 22 of the one-way valve, first, the head 16 of the hexagonal cylinder 7 is passed through the valve hole of the valve seat 22. During the insertion of the head 16, the eccentric claw cylinder 5 and the concentric guide cylinder 4 are blocked outside the valve hole of the valve seat 22. After the head 16 has completely passed through the valve hole of the valve seat 22, since the diameter of the cylinder 15 of the hexagonal cylinder 7 is smaller than the diameter of the head 16, there will be a certain amount of space between the cylinder 15 and the valve hole of the valve seat 22. The hexagonal cylinder 7 is moved horizontally in the radial direction so that the eccentric claw cylinder 5 can just enter the valve hole of the valve seat 22. After the eccentric claw cylinder 5 enters the valve hole of the valve seat 22, the hexagonal cylinder 7 is moved downward to leave space for the eccentric claw cylinder 5 to move downward until the eccentric claw cylinder 5 completely passes through the valve hole of the valve seat 22. Placed below the valve seat 22, the hexagonal head cylinder 7 is then moved horizontally radially again, allowing the concentric guide cylinder 4 to enter the valve hole of the valve seat 22. Once the concentric guide cylinder 4 enters the valve hole of the valve seat 22, the central axes of the hexagonal head cylinder 7, the valve seat 22 of the one-way valve, the screw 1, and the concentric guide cylinder 4 will be on the same axis. Since the farthest distance from the central axis of the second through hole 18 of the eccentric claw cylinder 5 to the outer wall of the eccentric claw cylinder 5 is greater than the radius of the valve hole of the one-way valve seat 22, the eccentric claw cylinder 5 has already shifted a certain distance from the valve hole of the valve seat 22. Then, the lifting ring handle 6 is pulled upwards, and the upper end face of the eccentric claw cylinder 5 will contact the bottom end of the valve seat 22, thus satisfying the requirements of positioning the concentric guide cylinder 4 and locking the eccentric claw cylinder 5 into the valve seat 22. When the eccentric jaw cylinder 5 engages the bottom of the one-way valve seat 22, lift the lifting ring handle 6, place the support disc 3 at the port of the one-way valve cavity, and simultaneously rotate the nut 2 clockwise while pressing against the support disc 3 to lift the screw 1. As the screw 1 moves upward, it will drive the hexagonal head cylinder 7 and the valve seat 22 upward together. Continuously lift the screw 1 upward to remove the valve seat 22. The one-way valve disassembly and assembly tool described in this utility model adopts the principle of linear motion of nut 2 rotation, relying on the tightening of nut 2 to lift the screw 1 and pull out the one-way valve.

[0023] In practical applications, various specifications are provided for the screw 1, the hexagonal head cylinder 7, and the support disc 3, based on the depth of the inlet and outlet check valve chambers of the reciprocating plunger pump, the diameter of the end cap orifice, and the height of the check valve, to accommodate check valves of different sizes and models. The screw 1, nut 2, and washer 9 can be standard parts or custom-made. The support disc 3 is made of a support material with a through hole at its center, allowing it to be fitted onto the cylinder 15 of the screw 1 or hexagonal head cylinder 7. The concentric guide cylinder 4, eccentric claw cylinder 5, and hexagonal head cylinder 7 can all be manufactured from cylinders. In this description, unless otherwise stated, "various" means two or more.

[0024] In actual operation, the operator holds the main structural component and inserts the head 16 of the hexagonal cylinder 7 through the hexagonal hole 12 into the circular hole structure 11 of the dedicated three-jaw body 8. Then, the operator rotates the main structural component or the dedicated three-jaw body 8 so that the head 16 of the hexagonal cylinder 7 can extend into the hexagonal groove 13 and engage with it, thus connecting the main structural component and the dedicated three-jaw body 8. Subsequently, the three-jaw structure 10 of the dedicated three-jaw body 8 is connected to the valve seat 22 of the one-way valve. Then, the operator rotates the lifting ring handle 6 to rotate the dedicated three-jaw body 8 together, thereby removing the valve cap 19 of the one-way valve. After the valve cap 19 of the one-way valve is removed, the operator manually removes the valve cap 19, spring 20, and valve core 21 in sequence, exposing the valve seat 22. At this time, the operator holds the main structural component, so that the head 16 of the hexagonal cylinder 7 enters the circular hole structure 11. Then, the operator rotates the main structural component or the special three-jaw body 8 so that the head 16 of the hexagonal cylinder 7 can extend into the hexagonal hole 12 and cooperate with the hexagonal hole 12. After the head 16 enters the hexagonal hole 12, the operator can separate the head 16 from the special three-jaw body 8 by moving the special three-jaw body 8 away from the head 16. Then, the operator disassembles the one-way valve seat 22 using the main structural components. First, the head 16 of the hexagonal cylinder 7 is passed through the valve hole of the valve seat 22. Then, the hexagonal cylinder 7 is moved horizontally in the radial direction so that the eccentric claw cylinder 5 can be inserted into the valve hole of the valve seat 22. After the eccentric claw cylinder 5 is inserted into the valve hole of the valve seat 22, the hexagonal cylinder 7 is moved downward until the eccentric claw cylinder 5 is completely inserted out of the valve hole of the valve seat 22 and positioned below the valve seat 22. At this point, the hexagonal cylinder 7 is moved horizontally in the radial direction again so that the concentric guide cylinder 4 can be inserted into the valve hole of the valve seat 22. When the concentric guide cylinder 4... After entering the valve hole of the valve seat 22, the central axes of the hexagonal head cylinder 7, the valve seat 22 of the one-way valve, the screw 1, and the concentric guide cylinder 4 will be on the same axis. Since the farthest distance from the central axis of the second through hole 18 of the eccentric claw cylinder 5 to the outer wall of the eccentric claw cylinder 5 is greater than the radius of the valve hole of the one-way valve seat 22, the eccentric claw cylinder 5 has already shifted a certain distance from the valve hole of the valve seat 22. Then, by pulling the lifting ring handle 6 upward, the upper end face of the eccentric claw cylinder 5 will contact the bottom end of the valve seat 22, thereby satisfying the requirements of positioning of the concentric guide cylinder 4 and locking of the eccentric claw cylinder 5 into the valve seat 22. When the eccentric claw cylinder 5 jams the bottom of the one-way valve seat 22, lift the lifting ring handle 6, place the support disc 3 at the port of the one-way valve cavity, and at the same time rotate the nut 2 clockwise while pressing the support disc 3 to lift the screw 1. As the screw 1 moves upward, it will drive the hexagonal head cylinder 7 and the valve seat 22 to move upward together. Continuously lift the screw 1 upward to remove the valve seat 22.

[0025] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A special tool for disassembling and assembling the inlet and outlet check valves of a reciprocating plunger pump on a drilling platform, characterized in that: It includes a screw (1), a nut (2), a support disc (3), a lifting ring handle (6), a positioning claw mechanism, and a special three-jaw body (8). The upper end of the positioning claw mechanism is connected to the screw (1) and the lifting ring handle (6) in sequence. The lower end of the positioning claw mechanism is detachably connected to the special three-jaw body (8). The screw (1) is fitted with a nut (2) and a support disc (3). At the same time, the nut (2) and the screw (1) are threaded together. The support disc (3) can move along the axial direction of the screw (1). The positioning claw mechanism includes a concentric guide cylinder (4), an eccentric claw cylinder (5), and a hexagonal head cylinder (7). The concentric guide cylinder (4) and the eccentric claw cylinder (5) are respectively sleeved on the column body (15) of the hexagonal head cylinder (7). At the same time, the concentric guide cylinder (4) and the eccentric claw cylinder (5) can move axially along the column body (15) and the screw (1), respectively. The eccentric claw cylinder (5) is located below the concentric guide cylinder (4).

2. The special tool for disassembling and assembling the inlet and outlet check valves of a reciprocating plunger pump for a drilling platform according to claim 1, characterized in that: The central axes of the screw (1), the concentric guide cylinder (4), and the hexagonal head cylinder (7) coincide.

3. A special tool for disassembling and assembling the inlet and outlet check valves of a reciprocating plunger pump for a drilling platform according to claim 1, characterized in that: The special three-jaw body (8) includes a three-jaw structure (10), a round hole structure (11), a hexagonal head hole (12), and a hexagonal groove (13). The upper end of the three-jaw structure (10) is provided with a hexagonal groove (13) that is compatible with the head (16) of the hexagonal head cylinder (7). The upper end of the hexagonal groove (13) is provided with a round hole structure (11) that is tangent to it. The hexagonal head hole (12) is provided above the round hole structure (11). The hexagonal head hole (12), the round hole structure (11), and the hexagonal groove (13) are coaxially arranged. At the same time, the cross-sectional shape of the hexagonal head hole (12) is the same as the cross-sectional shape of the hexagonal groove (13), and the cross-sectional projection of the hexagonal head hole (12) and the cross-sectional projection of the hexagonal groove (13) are offset by a rotation angle around the axis of the hexagonal head hole (12).

4. A special tool for disassembling and assembling the inlet and outlet check valves of a reciprocating plunger pump for a drilling platform according to claim 3, characterized in that: The cross-sectional shape of the hexagonal head hole (12) and the hexagonal groove (13) is a regular hexagon; the cross-sectional projection of the circular hole structure (11) is a circle, and the circle of the cross-sectional projection of the circular hole structure (11) is circumscribed by the regular hexagon of the cross-sectional projection of the hexagonal groove (13).

5. A special tool for disassembling and assembling the inlet and outlet check valves of a reciprocating plunger pump for a drilling platform according to claim 1, characterized in that: A washer (9) is provided between the nut (2) and the support disc (3). The washer (9) is fitted on the stud and can move up and down along the stud.

6. A special tool for disassembling and assembling the inlet and outlet check valves of a reciprocating plunger pump for a drilling platform according to claim 1, characterized in that: The diameters of the circumscribed circle of the hexagonal head (16) of the hexagonal head cylinder (7), the concentric guide cylinder (4), and the eccentric claw cylinder (5) are equal. When the concentric guide cylinder (4) moves into the valve hole of the valve seat (22) of the one-way valve to be disassembled, a gap is provided between the outer wall of the concentric guide cylinder (4) and the inner wall of the valve hole of the valve seat (22); When the eccentric claw cylinder (5) is located in the valve hole of the valve seat (22) of the one-way valve to be disassembled, a gap is provided between the outer wall of the eccentric claw cylinder (5) and the inner wall of the valve hole of the valve seat (22).

7. A special tool for disassembling and assembling the inlet and outlet check valves of a reciprocating plunger pump for a drilling platform according to claim 1, characterized in that: A first through hole (17) is provided on the concentric guide cylinder (4), the center of the first through hole (17) is concentric with the center of the concentric guide cylinder (4), and a second through hole (18) is provided on the eccentric claw cylinder (5), the center of the second through hole (18) is offset from the center of the eccentric claw cylinder (5).

8. A special tool for disassembling and assembling the inlet and outlet check valves of a reciprocating plunger pump for a drilling platform according to claim 7, characterized in that: The furthest distance from the central axis of the second through hole (18) to the outer wall of the eccentric claw cylinder (5) is greater than the valve hole radius of the one-way valve seat (22).

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