CN115446772B

CN115446772B - Valve seat extractor

Info

Publication number: CN115446772B
Application number: CN202211190050.1A
Authority: CN
Inventors: 殷凤祥; 肖署光; 王肖凤
Original assignee: Beijing Aofeide Oil & Gas Technology Co ltd
Current assignee: Beijing Aofeide Oil & Gas Technology Co ltd
Priority date: 2022-09-28
Filing date: 2022-09-28
Publication date: 2024-05-24
Anticipated expiration: 2042-09-28
Also published as: CN115446772A

Abstract

The invention belongs to the technical field of auxiliary tools of oilfield exploitation equipment, and particularly relates to a valve seat extractor; the lifting rod in the valve seat extractor can drive the claw seat to act together with the claw sleeve, so that the extraction head claw valve arranged between the claw seat and the claw sleeve can be extruded by the fixed sleeve or the elastic sealing ring to realize the state change of extension or retraction under the pushing or pulling of the lifting rod.

Description

Valve seat extractor

Technical Field

The invention belongs to the technical field of auxiliary tools of oilfield exploitation equipment, and particularly relates to a valve seat extractor.

Background

Since petroleum is found by human beings and exploited and used up to now, oil and gas field exploitation at home and abroad has formed relatively mature exploitation processes and flows, well drilling, well cementation, fracturing and acidification become the most common construction processes and flows in oil and gas field exploitation, and a well drilling plunger pump (well drilling piston pump), a well cementation plunger pump, a fracturing plunger pump and an acidification plunger pump are key components of exploitation equipment in the four exploitation processes and flows respectively, and all of the four exploitation processes and flows realize corresponding functions and targets by pumping high-pressure fluid medium into a well; the pumps drive the plunger or the piston to do high-speed reciprocating linear motion through the power provided by the power end, so that the suction and the discharge of the fluid medium in the valve box of the hydraulic end of the pump are realized.

The valve body and the valve seat are used as key components in a fluid medium suction and discharge channel, and in the process of continuously sucking and discharging the fluid medium, the valve body assembly provided with the valve rubber is continuously collided with the valve seat at a high speed, so that the service lives of the valve body and the valve seat are very short, the valve body and the valve seat are easy to consume in the pump, and the valve body and the valve seat need to be replaced frequently; the valve body is easy to take out, and the valve seat is tightly connected with the valve box of the hydraulic end of the pump after being pumped by high pressure, so that the valve seat is not easy to take out, and a special valve seat extractor is needed to take out and replace the valve seat.

Taking fracturing construction of a Changqing area as an example, every sand is added to fracture two to three sections of stratum, a pump (a fracturing plunger pump) is needed to be checked to replace valve seats, each horizontal well is calculated as 12 sections of stratum fracturing construction, the whole construction time is about 3 to 4 days, the number of the valve seats needed to be replaced is over 150 to 200, and the maximum number of the valve seats is 300; 2-3 persons are needed to match each time when the valve seat is replaced, the time for replacing one valve seat is 10-15 minutes, the time for replacing the valve seat of each pump is 60-90 minutes when the pump is inspected every three sections of stratum, the accumulated time for inspecting and replacing one fracturing unit (6-8 pumps) is 6-12 hours, and the valve seat replacement time for the horizontal well of the whole 12 sections of stratum is 24-48 hours;

Although a plurality of groups of personnel simultaneously replace the valve seat in actual operation, the total time for replacing the valve seat is not changed, and the labor intensity for replacing the valve seat is very high and time-consuming.

At present, although the traditional valve seat extractor can extract the valve seat, the operation is still not very convenient, and 2-3 persons are usually required to cooperate; although some valve seat extractors are improved compared with common valve seat extractors, the extraction head can be relatively easily inserted into an inner hole of the valve seat and hung on the bottom surface of the valve seat, and then the valve seat is extracted in a drawing mode; however, after the valve seat is taken out, the taking-out head of the extractor and the valve seat still need to be separated by hands, and the operation mode needs two persons to cooperate, so that the operation is troublesome, and safety accidents such as clamping hand injury and the like are easy to occur due to poor cooperation. Therefore, the valve seat extractor which is simple to operate and convenient to take and put the valve seat is a technical problem to be solved urgently by those skilled in the art.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a valve seat extractor, which aims to solve the technical problems of high labor intensity and time consumption in valve seat replacement caused by troublesome operation of the valve seat extractor in the prior art.

The invention is realized by the following technical scheme:

a valve seat extractor comprises a fixed component, a sliding component and a driving device;

The fixing assembly comprises a screw rod pull rod, a fixing sleeve and a locking nut; the screw rod pull rod is internally provided with a lifting space and a through hole A, the lifting space is arranged close to the fixed end of the screw rod pull rod, and the through hole A extends into the lifting space from the lifting end of the screw rod pull rod; the outer side wall of the screw rod pull rod is provided with an external thread, and the lock nut is sleeved on the screw rod pull rod through matching with the external thread; the fixed sleeve is arranged at the fixed end of the screw rod pull rod, the outer side wall of the fixed sleeve is a conical surface, and the diameter of one end of the fixed sleeve, which is close to the lifting space, is smaller than the diameter of one end of the fixed sleeve, which is far away from the lifting space;

The sliding component comprises a lifting rod, a lifting sliding block, a claw seat, a claw sleeve, a taking-out head claw valve and an elastic sealing ring; the lifting slide block is arranged in the lifting space in a sliding manner along the axial direction of the screw rod pull rod, the fixed end of the lifting pull rod passes through the through hole A to be connected with the lifting slide block, and the movable end of the lifting pull rod passes through the lifting end of the screw rod pull rod; the claw seat and the claw sleeve are of circular annular structures, the claw seat is sleeved on the screw rod pull rod, the claw sleeve is sleeved on the claw seat, the claw seat and the claw sleeve are connected with the lifting slide block, a hanging step is arranged on the outer side wall of the circumference of the claw seat, and the hanging step is positioned in the claw sleeve; the two ends of the taking-out head claw are respectively provided with a hanging part and a hooking part, the hanging part and the hooking part extend to two sides of the taking-out head claw respectively, the number of the taking-out head claw is multiple, all the taking-out head claw are equidistantly arranged around the circumference of the claw seat, and the hanging part of the taking-out head claw penetrates through the space between the claw seat and the claw sleeve and is hung on the hanging step; the elastic sealing ring extrudes and adheres all the head claw petals to the screw rod pull rod;

The action end of the driving device is arranged on one surface of the lock nut, which faces the fixed end of the screw rod pull rod.

In order to better realize the invention, the structure is further optimized, the fixing assembly further comprises a handle part, the handle part is arranged at the lifting end of the screw rod pull rod, a through hole B is arranged on the handle part, the through hole B is communicated with the through hole A, and the movable end of the lifting rod passes through the through hole B and passes out from one end of the handle part far away from the screw rod pull rod.

In order to better realize the invention, the structure is further optimized, a plurality of rocking bars are arranged on the circumferential side wall of the locking nut, and the free ends of the rocking bars incline towards the direction away from the fixed end of the screw rod pull rod.

In order to better realize the invention, in the structure, the external thread extends from the lifting end of the screw rod pull rod to the direction of the fixed end, and the extending length of the external thread is smaller than the length of the through hole A.

In order to better realize the invention, the structure is further optimized, the included angle between the outer side wall of the fixed sleeve and the axis of the screw rod pull rod is larger than 0 degrees, and the included angle between the outer side wall of the fixed sleeve and the axis of the screw rod pull rod is smaller than 90 degrees; the circumference lateral wall of fixed cover is provided with spacing step, spacing step is located the fixed cover is close to the one end of the stiff end of lead screw pull rod.

In order to better realize the invention, the structure is further optimized, the sliding assembly further comprises a lifting nozzle, the lower end face of the lifting nozzle is provided with a mounting hole, and the movable end of the lifting rod is arranged in the mounting hole.

In order to better realize the invention, in the structure, the lifting slide block is further optimized, the axis of the axis hole is perpendicular to the axis of the through hole A, a fixed shaft is arranged in the axis hole, and both ends of the fixed shaft penetrate through the outer side wall of the lifting slide block; the claw seat is provided with a through hole A, the claw sleeve is provided with a through hole B, and the claw seat and the claw sleeve are respectively arranged on the lifting slide block through the through hole A and the cooperation of the through hole B and the fixed shaft.

In order to better realize the invention, the structure is further optimized, the sliding assembly further comprises a limiting retainer ring, a limiting groove is formed in the circumferential outer side wall of the claw sleeve, the through hole B is located in the limiting groove, and the limiting retainer ring is sleeved in the limiting groove.

In order to better realize the invention, in the structure, a plurality of limit protrusions are arranged on the circumferential outer side wall of the claw seat, all limit protrusions are arranged around the circumferential outer side wall of the claw seat at equal intervals, two adjacent limit protrusions and the circumferential outer side wall of the claw seat enclose a fixing groove, and the hanging part of the claw flap of the taking-out head passes through the fixing groove and is hung on the hanging step.

In order to better realize the invention, the structure is further optimized, the driving device comprises a hydraulic pump, a hydraulic hose and a hydraulic disc, the hydraulic disc is provided with a perforation which is convenient for the screw rod pull rod to pass through, and the hydraulic pump is communicated with the hydraulic disc through the hydraulic hose.

In summary, the invention has the following technical effects:

The lifting rod in the valve seat extractor can drive the claw seat to act together with the claw sleeve, so that the extraction head claw valve arranged between the claw seat and the claw sleeve can be extruded by the fixed sleeve or the elastic sealing ring to realize the extending or retracting state change under the pushing or pulling of the lifting rod, when the valve seat extractor is used for extracting the valve seat, the fixed end of the screw rod pull rod can penetrate the valve seat, the extraction head claw valve extends out of the hook to be arranged at the bottom of the valve seat, the screw rod pull rod is pushed by the driving device to push the screw rod pull rod to take the valve seat away from the valve box of the pump hydraulic end, and then the extraction head claw valve is retracted by pulling the lifting rod, so that the valve seat is separated from the valve seat extractor, the valve seat is more easily and conveniently extracted and released, the number of operators can be effectively reduced, the labor intensity of the operators is lightened, the construction efficiency is improved, and the construction cost is reduced.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a valve seat extractor in use according to the present invention;

FIG. 2 is a cross-sectional view of a valve seat remover of the present invention in use;

FIG. 3 is a schematic view showing the assembled structure of the fixed assembly and the sliding assembly in the valve seat remover according to the present invention;

FIG. 4 is a cross-sectional view of the valve seat remover of the present invention after assembly of the fixed assembly and the sliding assembly;

FIG. 5 is a cross-sectional view of a sliding body in a valve seat remover according to the present invention;

FIG. 6 is an exploded view of a sliding body in a valve seat remover according to the present invention;

fig. 7 is a cut-away view of a sliding body in a valve seat remover of the present invention.

Reference numerals:

1. A fixing assembly; 11. a screw rod pull rod; 111. a through hole A; 112. lifting the space; 12. a fixed sleeve; 121. a limit step; 13. a lock nut; 131. a rocker; 14. a handle part; 141. a through hole B;

2. A sliding assembly; 21. a lifting rod; 22. lifting the sliding block; 221. a shaft hole; 222. a fixed shaft; 23. a claw seat; 231. hanging a step; 232. a through hole A; 233. a limit protrusion; 24. a claw sleeve; 241. a through hole B; 242. a limit groove; 25. taking out the head claw valve; 251. a hanging part; 252. a hooking portion; 26. an elastic sealing ring; 27. lifting a mouth; 28. a limit retainer ring;

3. a driving device; 31. a hydraulic pump; 32. a hydraulic hose; 33. a hydraulic disc;

4. A valve seat;

5. Pump fluid end valve box.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, based on the examples herein, which are within the scope of the invention as defined by the claims, will be within the scope of the invention as defined by the claims.

In the description of the present invention, it is to be noted that, unless otherwise indicated, the meaning of "plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", etc., refer to an orientation or positional relationship based on that shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.

Examples:

As shown in fig. 1 to 7:

a valve seat extractor comprises a fixed component 1, a sliding component 2 and a driving device 3; wherein,

The fixing assembly 1 comprises a screw rod pull rod 11, a fixing sleeve 12 and a locking nut 13; a lifting space 112 and a through hole A111 are arranged in the screw rod pull rod 11, the lifting space 112 is close to the fixed end of the screw rod pull rod 11, and the through hole A111 extends into the lifting space 112 from the lifting end of the screw rod pull rod 11; the outer side wall of the screw rod pull rod 11 is provided with external threads, and the lock nut 13 is sleeved on the screw rod pull rod 11 through matching with the external threads; the fixed sleeve 12 is arranged at the fixed end of the screw rod pull rod 11, the outer side wall of the fixed sleeve 12 is a conical surface, and the diameter of one end of the fixed sleeve 12 close to the lifting space 112 is smaller than the diameter of one end of the fixed sleeve 12 away from the lifting space 112;

The sliding component 2 comprises a lifting rod 21, a lifting sliding block 22, a claw seat 23, a claw sleeve 24, a taking-out head claw 25 and an elastic sealing ring 26; the lifting slide block 22 is arranged in the lifting space 112 in a sliding manner along the axial direction of the screw rod pull rod 11, the fixed end of the lifting pull rod 21 passes through the through hole A111 to be connected with the lifting slide block 22, and the movable end of the lifting pull rod 21 passes through the lifting end of the screw rod pull rod 11; the claw seat 23 and the claw sleeve 24 are of circular annular structures, the claw seat 23 is sleeved on the screw rod pull rod 11, the claw sleeve 24 is sleeved on the claw seat 23, the claw seat 23 and the claw sleeve 24 are connected with the lifting slide block 22, the circumferential outer side wall of the claw seat 23 is provided with a hanging step 231, the hanging step 231 is positioned in the claw sleeve 24, and the claw seat 23, the claw sleeve 24 and the taking-out head claw 25 form a sliding main body; the two ends of the taking-out head claw 25 are respectively provided with a hanging part 251 and a hooking part 252, the hanging part 251 and the hooking part 252 respectively extend to two sides of the taking-out head claw 25, the number of the taking-out head claw 25 is a plurality of, all the taking-out head claw 25 are arranged at equal intervals around the circumference of the claw seat 23, the hanging part 251 of the taking-out head claw 25 passes through the space between the claw seat 23 and the claw sleeve 24 and is hung on the hanging step 231, and the cooperation of the claw seat 23 and the claw sleeve 24 can prevent the taking-out head claw 25 from being separated from the hanging step 231; the elastic sealing ring 26 presses and adheres all the taking-out head claw 25 to the screw rod pull rod 11;

the actuating end of the drive device 3 is arranged on the side of the lock nut 13 facing the fixed end of the spindle pull rod 11.

In an initial state, the extracting head claw 25 in the valve seat extractor is in a retracted state under the extrusion action of the elastic sealing ring 26, and when in use, a worker can extend the fixed end of the screw rod pull rod 11 in the valve seat extractor into the valve box of the pump hydraulic end and enable the fixed end to pass through the valve seat, and meanwhile, the action end of the driving device 3 is arranged between the lock nut 13 and the valve box of the pump hydraulic end;

Then, the staff can push the lifting rod 21 downwards, the lifting rod 21 drives the taking-out head claw 25 to move downwards through the claw seat 23 and the claw sleeve 24, and the hooking part on the taking-out head claw 25 is outwards diffused along the conical surface of the fixed sleeve 12, so that the hooking part 252 of the taking-out head claw 25 extends towards the circumferential direction of the screw rod pull rod 11 and is hooked at the bottom of the valve seat;

then, a worker can screw the lock nut 13 so that the lock nut 13 is propped against the upper end face of the action end of the driving device 3, and at the moment, the worker can operate the driving device 3 to push/pull the lock nut 13 on the screw rod pull rod 11 to a direction away from the valve box of the hydraulic end of the pump by the action end of the driving device 3, so that the valve seat can be easily taken out;

After the valve seat is taken out, a worker can pull the lifting rod 21 to enable the taking-out head claw 25 to move in a direction away from the fixed sleeve 12, at this time, all the taking-out head claw 25 can be restored to an initial state under the action of the elastic sealing ring 26, so that the valve seat can be removed from the valve seat remover, and the worker does not need to take the valve seat by hand.

The valve seat extractor is simple in operation mode and use process, can effectively reduce the number of operators, and lightens the labor intensity of the operators so as to improve the construction efficiency and reduce the construction cost; meanwhile, the change of the extending and retracting states of the extracting head claw 25 is realized by pushing/pulling the lifting rod 21, so that the condition that a worker is injured by the valve seat extractor can be effectively avoided, and the safety of the valve seat extractor in use is improved.

Preferably, the fixing assembly 1 further comprises a handle portion 14, the handle portion 14 is arranged at the lifting end of the screw rod pull rod 11, so that the valve seat extractor is more convenient to take and put, the handle portion 14 is provided with a through hole B141, the through hole B141 is communicated with the through hole A111, the movable end of the lifting rod 21 penetrates through the through hole B141 and is penetrated out from the end, far away from the screw rod pull rod 11, of the handle portion 14, and the operation of stretching out and retracting the valve 25 of the extracting head cannot be influenced by the handle portion 14.

Optimally, a plurality of rockers 131 are arranged on the circumferential side wall of the lock nut 13, and a worker can screw the lock nut 13 by pushing the rockers 131, so that the position of the lock nut 13 can be adjusted more simply and conveniently.

Preferably, the free end of the rocker 131 is inclined away from the fixed end of the lead screw rod 11.

Optimally, the external thread extends from the lifting end of the screw rod pull rod 11 to the direction of the fixed end, the extending length of the external thread is smaller than the length of the through hole A111, and the part which is not provided with the external thread is an optical axis, so that the sliding of the claw seat 23 and the claw sleeve 24 is more stable and smooth, and the valve seat extractor is more convenient to use.

Optimally, the included angle between the outer side wall of the fixed sleeve 12 and the axis of the screw rod pull rod 11 is larger than 0 degrees, and the included angle between the outer side wall of the fixed sleeve 12 and the axis of the screw rod pull rod 11 is smaller than 90 degrees, so that the taking-out head claw 25 can smoothly slide along the outer side wall of the fixed sleeve 12, and the change of the extending state of the taking-out head claw 25 is realized.

Preferably, the included angle between the outer side wall of the fixing sleeve 12 and the axis of the screw rod pull rod 11 is 15 degrees, so that the extracting head claw 25 can extend to the bottom of the valve seat after being moved down in a short distance and is hooked on the valve seat, and the valve seat extractor is more convenient to use.

Optimally, the circumferential outer side wall of the fixing sleeve 12 is provided with the limiting step 121, the limiting step 121 is located at one end of the fixing sleeve 12 far away from the lifting space 112, the limiting step 121 can support one end of the taking-out head claw 25, which is provided with the hooking part 252, so that a certain supporting force is provided for the taking-out head claw 25, the structure of the taking-out head claw 25 is more stable, and the valve seat remover can take out the valve seat more easily.

Optimally, the sliding assembly 2 further comprises a lifting nozzle 27, the lower end surface of the lifting nozzle 27 is provided with a mounting hole, and the movable end of the lifting rod 21 is arranged in the mounting hole; the operator can realize the adjustment of the state of the extracting head claw 25 by pulling or pushing the extracting nozzle 27, so that the valve seat extractor is more convenient to use.

Optimally, the lifting slide block 22 is provided with a shaft hole 221, the axis of the shaft hole 221 is perpendicular to the axis of the through hole A111, a fixed shaft 222 is arranged in the shaft hole 221, and both ends of the fixed shaft 222 penetrate through the outer side wall of the lifting slide block 22;

The above-mentioned claw seat 23 is provided with a through hole a232, the claw sleeve 24 is provided with a through hole B241, and the claw seat 23 and the claw sleeve 24 are respectively arranged on the lifting slide block 22 through the through hole a232 and the cooperation of the through hole B241 and the fixed shaft 222, so that the connection between the claw seat 23 and the claw sleeve 24 and the lifting slide block 22 is more stable.

Preferably, a sealing ring is arranged between the jaw seat 23 and the jaw sleeve 24, and the sealing ring can maintain the stability between the jaw seat 23 and the jaw sleeve 24 and reduce the occurrence of collision between the jaw seat 23 and the jaw sleeve 24, so that the structure of the valve seat extractor is more stable.

Optimally, the sliding assembly 2 further comprises a limiting retainer ring 28, a limiting groove 242 is formed in the circumferential outer side wall of the claw sleeve 24, the through hole B241 is located in the limiting groove 242, and the limiting retainer ring 28 is sleeved in the limiting groove 242, so that the situation that the claw seat 23 and the claw sleeve 24 are separated from the lifting sliding block 22 due to the fact that the fixing shaft 222 is separated from the shaft hole 221 is prevented, and the structure of the valve seat extractor is further stable.

Optimally, the circumferential outer side wall of the claw seat 23 is provided with a plurality of limit protrusions 233, all limit protrusions 233 are arranged at equal intervals and surround the circumferential outer side wall of the claw seat 23, two adjacent limit protrusions 233 and the circumferential outer side wall of the claw seat 23 form a fixed groove, and the hanging part 251 of the taking-out head claw 25 penetrates through the fixed groove and is hung on the hanging step 231, so that the position of the taking-out head claw 25 is better limited, and the situation that the valve seat extractor cannot be normally used due to the change of the position of the taking-out head claw 25 is avoided.

Preferably, a clamping groove is formed on one surface of the extraction head claw 25 far away from the screw rod pull rod 11, the extending direction of the clamping groove is perpendicular to the length direction of the extraction head claw 25, all the clamping grooves on the extraction head claw 25 are connected to form an annular groove, and the elastic sealing ring 26 is clamped in the annular groove, so that the situation that the extraction head claw 25 cannot realize the change of the retraction state due to the change of the position of the elastic sealing ring is avoided.

Preferably, the driving device 3 includes a hydraulic pump 31, a hydraulic hose 32 and a hydraulic disc 33, wherein a perforation is arranged on the hydraulic disc 33, and a fixed end of the screw rod pull rod 11 passes through the perforation on the hydraulic disc 33 and stretches into a valve box of the hydraulic end of the pump, so that the hydraulic disc 33 is positioned between the lock nut 13 and the valve box of the hydraulic end of the pump, and the hydraulic pump 31 is communicated with the hydraulic disc 33 through the hydraulic hose 32;

The hydraulic pump 31 pumps hydraulic oil into the hydraulic disc 33, so that the thickness of the hydraulic disc 33 is increased, and the screw rod 11 is pushed away from the valve box of the pump hydraulic end, so that the valve seat extractor can extract the valve seat in the valve box of the pump hydraulic end.

The hydraulic pump 31 may be a hand-operated or manual hydraulic pump, a pneumatic hydraulic pump, an electric hydraulic pump, a fuel oil or gas hydraulic pump, or the like, that is, a pump body capable of pumping a liquid into the hydraulic plate 33 to change the thickness of the hydraulic plate 33.

In addition, the driving device 3 may be any driving mechanism other than a hydraulic driving mechanism; for example, the electric drive device or the pneumatic drive device, that is, the drive device capable of pushing the lead screw rod 11 in a direction away from the pump fluid end valve box may be selected according to the condition of the use site and the cost.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A valve seat extractor which is characterized in that: comprises a fixed component (1), a sliding component (2) and a driving device (3);

The fixing assembly (1) comprises a screw rod pull rod (11), a fixing sleeve (12) and a locking nut (13); a lifting space (112) and a through hole A (111) are arranged in the screw rod pull rod (11), the lifting space (112) is close to the fixed end of the screw rod pull rod (11), and the through hole A (111) extends into the lifting space (112) from the lifting end of the screw rod pull rod (11); the outer side wall of the screw rod pull rod (11) is provided with external threads, and the locking nut (13) is sleeved on the screw rod pull rod (11) through matching with the external threads; the fixed sleeve (12) is arranged at the fixed end of the screw rod pull rod (11), the outer side wall of the fixed sleeve (12) is a conical surface, and the diameter of one end of the fixed sleeve (12) close to the lifting space (112) is smaller than the diameter of one end of the fixed sleeve (12) far away from the lifting space (112);

The sliding assembly (2) comprises a lifting rod (21), a lifting sliding block (22), a claw seat (23), a claw sleeve (24), a taking-out head claw (25) and an elastic sealing ring (26); the lifting slide block (22) is arranged in the lifting space (112) in a sliding manner along the axial direction of the screw rod pull rod (11), the fixed end of the lifting rod (21) passes through the through hole A (111) to be connected with the lifting slide block (22), and the movable end of the lifting rod (21) penetrates out of the lifting end of the screw rod pull rod (11); the claw seat (23) and the claw sleeve (24) are of circular ring structures, the claw seat (23) is sleeved on the screw rod pull rod (11), the claw sleeve (24) is sleeved on the claw seat (23), the claw seat (23) and the claw sleeve (24) are connected with the lifting slide block (22), a hanging step (231) is arranged on the circumferential outer side wall of the claw seat (23), and the hanging step (231) is positioned in the claw sleeve (24); the two ends of the taking-out head claw (25) are respectively provided with a hanging part (251) and a hooking part (252), the hanging part (251) and the hooking part (252) respectively extend to the two sides of the taking-out head claw (25), the number of the taking-out head claw (25) is a plurality, all the taking-out head claw (25) are arranged at equal intervals around the circumference of the claw seat (23), and the hanging part (251) of the taking-out head claw (25) passes through the space between the claw seat (23) and the claw sleeve (24) and is hung on the hanging step (231); the elastic sealing ring (26) presses and attaches all the taking-out head claw petals (25) to the screw rod pull rod (11);

The action end of the driving device (3) is arranged on one surface of the lock nut (13) facing the fixed end of the screw rod pull rod (11).

2. The valve seat remover as claimed in claim 1, wherein: the fixing assembly (1) further comprises a handle part (14), the handle part (14) is arranged at the lifting end of the screw rod pull rod (11), a through hole B (141) is formed in the handle part (14), the through hole B (141) is communicated with the through hole A (111), and the movable end of the lifting rod (21) penetrates through the through hole B (141) and is far away from one end of the screw rod pull rod (11) through the handle part (14).

3. The valve seat remover as claimed in claim 2, wherein: a plurality of rocking bars (131) are arranged on the circumferential side wall of the lock nut (13), and the free ends of the rocking bars (131) incline towards the direction away from the fixed end of the screw rod pull rod (11).

4. The valve seat remover as claimed in claim 1, wherein: the external thread extends from the lifting end of the screw rod pull rod (11) to the direction of the fixed end, and the extending length of the external thread is smaller than the length of the through hole A (111).

5. The valve seat remover as claimed in claim 1, wherein: the included angle between the outer side wall of the fixed sleeve (12) and the axis of the screw rod pull rod (11) is larger than 0 degrees, and the included angle between the outer side wall of the fixed sleeve (12) and the axis of the screw rod pull rod (11) is smaller than 90 degrees; the circumference lateral wall of fixed cover (12) is provided with spacing step (121), spacing step (121) are located fixed cover (12) are close to the one end of the stiff end of lead screw pull rod (11).

6. The valve seat remover according to any of claims 1-5, wherein: the sliding assembly (2) further comprises a lifting nozzle (27), a mounting hole is formed in the lower end face of the lifting nozzle (27), and the movable end of the lifting rod (21) is arranged in the mounting hole.

7. The valve seat remover as claimed in claim 6, wherein: the lifting slide block (22) is provided with a shaft hole (221), the axis of the shaft hole (221) is perpendicular to the axis of the through hole A (111), a fixed shaft (222) is arranged in the shaft hole (221), and both ends of the fixed shaft (222) penetrate through the outer side wall of the lifting slide block (22); be provided with through-hole A (232) on claw seat (23), be provided with through-hole B (241) on claw cover (24), claw seat (23) with claw cover (24) are in through-hole A (232) respectively and through-hole B (241) with the cooperation of fixed axle (222) sets up on carrying and drawing slider (22).

8. The valve seat remover as claimed in claim 7, wherein: the sliding assembly (2) further comprises a limiting check ring (28), a limiting groove (242) is formed in the circumferential outer side wall of the claw sleeve (24), the through hole B (241) is located in the limiting groove (242), and the limiting check ring (28) is sleeved in the limiting groove (242).

9. The valve seat remover as claimed in claim 8, wherein: the circumference lateral wall of claw seat (23) is provided with a plurality of spacing protruding (233), all spacing protruding (233) equidistant encircle the circumference lateral wall of claw seat (23) sets up, and two adjacent spacing protruding (233) with the circumference lateral wall of claw seat (23) encloses into the fixed slot, hang portion (251) of taking out first claw lamella (25) pass the fixed slot is hung and is established on hanging step (231).

10. The valve seat remover as claimed in claim 1, wherein: the driving device (3) comprises a hydraulic pump (31), a hydraulic hose (32) and a hydraulic disc (33), wherein a through hole which is convenient for the screw rod pull rod (11) to pass through is formed in the hydraulic disc (33), and the hydraulic pump (31) is communicated with the hydraulic disc (33) through the hydraulic hose (32).