A wellhead valve for removing impurities in a retrievable pipeline during oil extraction

Abstract

The present invention discloses a wellhead valve for removing impurities from a pipeline for oil extraction, relates to the field of oil extraction, and solves the problem that in the process of screening and filtering impurities inside the pipeline during use of existing oil extraction wellhead valves, it is difficult to self-clean impurities inside the filter screen, resulting in a short service life of the equipment. The valve comprises a shell, a filtering mechanism, a cleaning mechanism and a switching mechanism. The side of the shell is connected with an input pipe and an output pipe. The filtering mechanism comprises a rotating shaft and a filter plate. A plurality of groups of sieve holes are evenly arranged on the filter plate. The cleaning mechanism comprises a cleaning rod. The present invention filters oil through the sieve holes on the filter plate, and simultaneously removes impurities on the two groups of filter plates through the cleaning rod. When the cleaning rod completes cleaning one side of the filter plate, the direction of the filter plate is switched through the switching mechanism, and the uncleaned small particles of impurities in the sieve holes are pushed to the side of the output pipe by the flow of oil for discharge, thereby realizing the self-cleaning function of the filter plate.

Description

Technical Field

[0001] The present invention relates to the technical field of oil extraction, and specifically relates to a wellhead valve for removing impurities in a pipeline during oil extraction that can be taken out. Background Art

[0002] A valve is a control component in a fluid transportation system. It is a pipeline accessory used to open and close pipelines, control the flow direction, adjust and control the parameters of the transported medium, and has functions such as cut-off, regulation, diversion, prevention of backflow, pressure stabilization, shunt, or overflow pressure relief. The wellhead valve for oil extraction is a valve used for controlling oil extraction transportation. There are quite a variety of its varieties and specifications, and the control methods of the valve are diverse. During the use of the wellhead valve, it is easily blocked by some continuously accumulating large particle impurities, resulting in the unstable operation of the wellhead valve.

[0003] The invention patent with the publication number CN113431520B discloses a wellhead valve for removing impurities in a pipeline during oil extraction that can be taken out. By arranging a filtering component on a support block, a water stop component is arranged on a support frame, and a scraping component is arranged on the support frame. Through the cooperation of a second screw rod with a collection frame and the devices thereon, the second screw rod and the devices thereon will move in opposite directions. During this process, a pushing frame will push the impurities on the collection frame onto a temporary storage frame, facilitating the subsequent cleaning of the scraped impurities, achieving the effect of being able to automatically collect the scraped impurities for subsequent removal of the impurities. Since the first scraping frames on both sides of this device need to move reciprocally to open and close, during the process of resetting and closing, a part of the impurities remaining on the surface of the filter mesh frame will be pushed towards the middle, resulting in the inability of the first scraping frames on both sides to fully close and reset. Over time, more and more impurities accumulate in the middle and cannot be removed, affecting the use efficiency of the equipment. At the same time, this device cannot automatically remove the impurities remaining inside the filter mesh frame. Over time, more and more impurities that are unidirectionally blocked inside the filter mesh frame will accumulate, affecting the overall fluidity of the valve. Summary of the Invention

[0004] The purpose of the present invention is to provide a wellhead valve for removing impurities in a pipeline during oil extraction that is convenient for improving the efficiency of removing impurities in the pipeline and extending the service life of the equipment, so as to solve the problems raised in the above background art.

[0005] To achieve the above object, the present invention provides the following technical solution: A wellhead valve for removing impurities in a retrievable pipeline during oil extraction, comprising a housing, a filtering mechanism, a cleaning mechanism, and a switching mechanism. An input pipe and an output pipe are connected to the side of the housing in a communicating manner. The filtering mechanism includes a rotating shaft rotatably connected to the inner wall of the housing. Two groups of filter plates are evenly and fixedly connected to the outer wall of the rotating shaft. The outer walls of the two groups of filter plates are slidably attached to the inner wall of the housing. Multiple groups of sieve holes are evenly formed in the filter plates, for filtering the oil flowing in from one side of the input pipe through the sieve holes in the filter plates, and conveying the filtered oil to the output pipe. The cleaning mechanism includes two cleaning rods installed in the housing. The side walls of the two cleaning rods are slidably attached to the outer walls of the filter plates on both sides respectively, for synchronously removing the impurities on the side of the two filter plates close to the input pipe through the cleaning rods, and at the same time being able to reinforce and limit the edges of the filter plates during reset. The switching mechanism is installed in the housing, for driving the rotating shaft to rotate 180° when one side of the filter plate is cleaned by the cleaning rod, so that the positions and orientations of the two groups of filter plates are switched. Then, the small particle impurities remaining in the sieve holes are pushed to the side of the output pipe for discharge by the flow of the oil, which is convenient for improving the efficiency of removing impurities in the pipeline and extending the service life of the equipment.

[0006] Preferably, the cleaning mechanism further includes a sealing frame fixedly installed on the side of the cleaning rod. Storage boxes are fixedly connected to both the upper and lower sides of the housing. A communication groove communicating with the storage box is formed in the housing. A limiting frame for reinforcing and limiting the edge position of the filter plate on the side away from the input pipe is fixedly connected to the side of the sealing frame. Both the sealing frame and the limiting frame are slidably connected to the inner wall of the communication groove in the vertical direction. A driving member for synchronously adjusting the movement of the two cleaning rods is provided on the housing, which is convenient for synchronously removing the impurities on the side of the two filter plates close to the input pipe through the cleaning rods, and at the same time being able to reinforce and limit the edges of the filter plates during reset.

[0007] Preferably, the driving member includes fixed frames fixedly installed on both sides of the housing. Guide grooves for slidably connecting the two cleaning rods in the vertical direction are respectively formed in the housing and the fixed frames. Guide frames are respectively fixedly connected to both the fixed frames. A guide block is slidably connected to the guide frame in the horizontal direction. Two rotating rods respectively rotatably connected to one end of the two cleaning rods are rotatably connected to the guide block. A control member for controlling the sliding state of the guide block according to the opening and closing state of the output pipe is provided on the guide frame, which is convenient for synchronously adjusting the movement of the two cleaning rods.

[0008] Preferably, the control member includes a control box fixedly installed on the output pipe. A control shaft is rotatably connected inside the control box. A communication hole for communicating the housing with the output pipe is formed on the control shaft. A knob for controlling the orientation of the communication hole is provided on the control shaft. A synchronizing member for synchronously adjusting the sliding state of the guide block according to the orientation of the communication hole is provided on the control box, which facilitates controlling the sliding state of the guide block according to the opening and closing state of the output pipe.

[0009] Preferably, the synchronizing member includes an electric telescopic rod fixedly installed on a group of the guide frames. The telescopic end of the electric telescopic rod is fixedly connected to the side surface of a group of the guide blocks that are close in distance. A fixed box is fixedly connected to the side surface of the control box. A control key is slidably connected inside the fixed box. One end of the control key is fixedly connected to a first spring fixedly connected to the fixed box. Each time the control key pops out, it can drive the electric telescopic rod to perform a reciprocating telescopic operation, which facilitates synchronously adjusting the sliding state of the guide block according to the orientation of the communication hole.

[0010] Preferably, the switching mechanism includes a tension spring fixedly installed at the bottom of the upper cleaning rod. A lifting frame is slidably connected in the fixed frame along the vertical direction. A plurality of groups of first bevel gear blocks are slidably connected in the lifting frame along the horizontal direction. The side surface of the first bevel gear block is fixedly connected to a second spring fixedly connected to the lifting frame. The bottom end of the tension spring is fixedly connected to the top surface of the lifting frame. A plurality of groups of second bevel gear blocks capable of meshing and driving with the first bevel gear blocks are fixedly connected to the outer wall of the rotating shaft uniformly. When one side of the filter plate is cleaned by the cleaning rod, it is convenient to drive the rotating shaft to rotate 180°, so that the positions and orientations of the two filter plates are switched. Then, the small particle impurities that are not cleaned in the sieve holes are pushed to the side of the output pipe for discharge by the flow of petroleum.

[0011] Preferably, an installation frame is fixedly connected in the fixed frame. A third bevel gear block capable of unidirectionally engaging with the second bevel gear block is slidably connected in the installation frame. One side of the third bevel gear block is fixedly connected to a third spring fixedly connected to the installation frame, which is convenient for limiting and controlling the rotation direction and position of the rotating shaft.

[0012] Preferably, a fourth spring is fixedly connected in the storage box. One end of the fourth spring is fixedly connected to a pushing plate capable of pushing most of the impurities in the cleaning rod and the sealing frame into the storage box for storage. Collection pipes are respectively and communicatively connected to the sides of the two storage boxes. A collection box is fixedly connected to the side surface of the housing. Both collection pipes are communicatively connected to the side surface of the collection box, which is convenient for uniformly collecting and processing the impurities in the storage box.

[0013] Preferably, both ends of the sieve holes are designed with tapered openings, so that the opening diameters at both ends are larger than the inner wall diameter at the middle position, which facilitates the screening of impurities and enables the impurities in the output end of the sieve holes to be pushed out of the sieve holes during the process of fluid passing through the sieve holes.

[0014] Preferably, sealing boxes are respectively fixedly connected to the sides of the two fixing frames, which facilitates the sealing of the guiding grooves on both sides.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] A wellhead valve for removing impurities in a pipeline during oil extraction provided by the present invention solves the problems that in the prior art, it is difficult to self-clean the impurities inside the filter screen during the process of screening and filtering the impurities inside the pipeline when using the wellhead valve for oil extraction, and the service life of the equipment is relatively short. The oil flowing in from one side of the input pipe is filtered through the sieve holes on the filter plate, and the filtered oil is transported to the output pipe. The impurities on the side of the two filter plates close to the input pipe are removed synchronously by the cleaning rod. At the same time, when resetting, the edge of the filter plate can be strengthened and limited by the cleaning mechanism. When one side of the filter plate is cleaned by the cleaning rod, the rotating shaft is rotated 180° through the switching mechanism linkage, so that the positions and orientations of the two filter plates are switched. Then, the small particle impurities not cleaned in the sieve holes are pushed to the side of the output pipe for discharge by the flow of oil, realizing the self-cleaning function of the filter plate, improving the circulation and screening efficiency during long-term use. This device does not require manual control. Only by opening and closing the valve, it can automatically switch the orientation of the filter plate and realize the self-cleaning of impurities when the valve is closed. The cleaning is more thorough and efficient, and at the same time, the blockage of the filter plate is avoided, and the overall service life of the equipment is prolonged. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the partial structure of the filtering mechanism of the present invention;

[0019] Figure 3 is Figure 2 The enlarged view of area A in

[0020] Figure 4 It is a schematic diagram of the partial structure of the control part of the present invention;

[0021] Figure 5 It is a schematic diagram of the partial structure of the cleaning mechanism of the present invention;

[0022] Figure 6 is Figure 5 The enlarged view of area B in

[0023] Figure 7Schematic diagram of the partial structure of the switching mechanism of the present invention;

[0024] Figure 8 Schematic diagram of the partial structure of the driving part of the present invention;

[0025] Figure 9 Cross-sectional view of the partial structure of the cleaning mechanism of the present invention.

[0026] In the figure: 1. Housing; 2. Input pipe; 3. Output pipe; 4. Rotating shaft; 5. Filter plate; 6. Sieve holes; 7. Cleaning rod; 8. Sealing frame; 9. Storage box; 10. Communication groove; 11. Limit frame; 12. Fixed frame; 13. Guide groove; 14. Guide frame; 15. Guide block; 16. Rotating rod; 17. Control box; 18. Control shaft; 19. Communication hole; 20. Knob; 21. Electric telescopic rod; 22. Fixed box; 23. Control key; 24. First spring; 25. Pulling spring; 26. Lifting frame; 27. First bevel gear block; 28. Second spring; 29. Second bevel gear block; 30. Installation frame; 31. Third bevel gear block; 32. Third spring; 33. Fourth spring; 34. Pushing plate; 35. Collection pipe; 36. Collection box; 37. Sealing box. Specific implementation mode

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] Embodiment 1: Please refer to Figures 1-9 , a wellhead valve for removing impurities in a pipeline that can be taken out during oil extraction shown in the figure, includes a housing 1, a filtering mechanism, a cleaning mechanism and a switching mechanism. An input pipe 2 and an output pipe 3 are connected to the side of the housing 1 in a communicating manner. The filtering mechanism includes a rotating shaft 4 rotatably connected to the inner wall of the housing 1. Two groups of filter plates 5 are uniformly fixedly connected to the outer wall of the rotating shaft 4. The outer walls of the two groups of filter plates 5 are both slidably attached to the inner wall of the housing 1. A plurality of groups of sieve holes 6 are uniformly opened on the filter plate 5. Both ends of the sieve holes 6 are designed with tapered openings, so that the opening diameters at both ends are larger than the inner wall diameter at the middle position, and are used to filter the oil flowing in from one side of the input pipe 2 through the sieve holes 6 on the filter plate 5, and convey the filtered oil to the output pipe 3.

[0029] The cleaning mechanism includes two groups of cleaning rods 7 installed inside the housing 1. The side walls of the two groups of cleaning rods 7 are respectively in sliding fit with the outer walls of the two side filter plates 5, and are used to synchronously remove impurities on the side of the two filter plates 5 close to the input pipe 2 through the cleaning rods 7. At the same time, it can reinforce and limit the edges of the filter plates 5 during reset. The switching mechanism is installed inside the housing 1 and is used to drive the rotating shaft 4 to rotate 180° when one side of the filter plate 5 is cleaned by the cleaning rod 7, so that the positions and orientations of the two filter plates 5 are switched. Then, the small particle impurities not cleaned in the sieve holes 6 are pushed to the output pipe 3 side by the flow of petroleum for discharge.

[0030] The cleaning mechanism further includes a sealing frame 8 fixedly installed on the side of the cleaning rod 7. Storage boxes 9 are fixedly connected to both the upper and lower sides of the housing 1. Communication grooves 10 communicating with the storage boxes 9 are provided on the housing 1. A limiting frame 11 for reinforcing and limiting the edge position of the filter plate 5 away from the input pipe 2 is fixedly connected to the side of the sealing frame 8. Both the sealing frame 8 and the limiting frame 11 are slidably connected to the inner wall of the communication groove 10 in the vertical direction. A driving member for synchronously adjusting the movement of the two cleaning rods 7 is provided on the housing 1.

[0031] The driving member includes fixed frames 12 fixedly installed on both sides of the housing 1. Guide grooves 13 for slidably connecting the two cleaning rods 7 in the vertical direction are respectively provided on the housing 1 and the fixed frames 12. Guide frames 14 are respectively fixedly connected to the two fixed frames 12. A guide block 15 is slidably connected in the guide frame 14 in the horizontal direction. Two rotating rods 16 respectively rotatably connected to one end of the two cleaning rods 7 are rotatably connected to the guide block 15. A control member for controlling the sliding state of the guide block 15 according to the opening and closing state of the output pipe 3 is provided on the guide frame 14. Sealing boxes 37 are respectively fixedly connected to the sides of the two fixed frames 12.

[0032] The control member includes a control box 17 fixedly installed on the output pipe 3. A control shaft 18 is rotatably connected inside the control box 17. A communication hole 19 for communicating the housing 1 with the output pipe 3 is provided on the control shaft 18. A knob 20 for controlling the orientation of the communication hole 19 is provided on the control shaft 18. A synchronizing member for synchronously adjusting the sliding state of the guide block 15 according to the orientation of the communication hole 19 is provided on the control box 17.

[0033] The synchronizing member includes an electric telescopic rod 21 fixedly installed on one guide frame 14. The telescopic end of the electric telescopic rod 21 is fixedly connected to the side of a group of guide blocks 15 close in distance. A fixed box 22 is fixedly connected to the side of the control box 17. A control key 23 is slidably connected inside the fixed box 22. A first spring 24 fixedly connected to the fixed box 22 is fixedly connected to one end of the control key 23. Each time the control key 23 pops out, it can drive the electric telescopic rod 21 to perform a reciprocating telescopic operation once.

[0034] A fourth spring 33 is fixedly connected inside the storage box 9. One end of the fourth spring 33 is fixedly connected with a push plate 34 capable of pushing most of the impurities in the cleaning rod 7 and the sealing frame 8 into the storage box 9 for storage. The sides of the two storage boxes 9 are respectively connected and communicated with a collecting pipe 35. The side of the housing 1 is fixedly connected with a collecting box 36. The two collecting pipes 35 are both connected and communicated with the side of the collecting box 36.

[0035] In this embodiment, one end of the input pipe 2 is fixedly connected and communicated with the oil extraction input end. By rotating the knob 20 to adjust the orientation of the control shaft 18 and change the communication state between the communication hole 19 and the housing 1, the flow rate and output state of the oil output from the output pipe 3 can be changed. When the valve body is in the open state, the oil flows through the housing 1 through the input pipe 2 and is output from the output pipe 3. After being screened by the two filter plates 5 inside the housing 1, the large-particle impurities are blocked on the side of the sieve holes 6 close to the input pipe 2, realizing the function of automatic screening.

[0036] When the valve is closed, the communication hole 19 rotates to the side position, and the outer wall of the control shaft 18 no longer presses the control key 23. The control key 23 is ejected into the communication hole 19 by the first spring 24. At this time, the electric telescopic rod 21 can be controlled to perform a reciprocating telescopic motion. The electric telescopic rod 21 extends, driving the guide block 15 to slide in the guide frame 14, so that the two rotating rods 16 on both sides push the cleaning rod 7 and the sealing frame 8 to slide together in the communication groove 10. The cleaning rod 7 pushes the large-particle impurities accumulated on the side of the filter plate 5 close to the input pipe 2 towards the storage box 9. Since the edge of the push plate 34 is designed as an inclined side, when the sealing frame 8 slides into the storage box 9, it will first push the push plate 34 to slide and compress the fourth spring 33. Until the cleaning rod 7 enters the storage box 9, the push plate 34 pops out under the push of the fourth spring 33, pushing the impurities between the cleaning rod 7 and the sealing frame 8 towards the collecting pipe 35 and transporting them to the collecting box 36 for collection and storage.

[0037] After that, the cleaning rod 7 and the limiting frame 11 release the clamping and limiting of both sides of the filter plate 5. Through the switching mechanism, the rotating shaft 4 can be linked to rotate 180°, switching the position and orientation of the filter plate 5. The sieve holes 6 on the side that was originally close to the input pipe 2 rotate to the side close to the output pipe 3. At this time, since the valve is in the closed state, the switching of the filter plate 5 will not cause a change in the flow rate of the internal liquid, and it will not affect the continuous filtration of the oil.

[0038] After the switching of the filter plate 5 is completed, the electric telescopic rod 21 starts to retract. The guiding block 15 slides in the reverse direction to drive the rotating rod 16 and the cleaning rod 7 to move, driving the cleaning rod 7 and the sealing frame 8 to move reversely towards the rotating shaft 4 in the middle. At this time, since the filter plate 5 on the side where the cleaning rod 7 slides is on the original side close to the output pipe 3, a large amount of residual impurities will not be pushed towards the middle, and the situation of being unable to reset will not occur. When the electric telescopic rod 21 is completely retracted, the cleaning rod 7 is reset. The sealing frame 8 fits and seals with the inner wall of the housing 1, preventing the oil in the housing 1 from flowing out into the communication groove 10. At the same time, the sealing frame 8 drives the limiting frame 11 to fit and abut against the outer wall of the filter plate 5 on the side close to the output pipe 3, making the edge position of the filter plate 5 more stable during the filtering process and preventing it from bending or rotating.

[0039] It should be noted that: due to the design of the sieve holes 6 with larger openings at both ends and a smaller middle channel, impurities will gradually enter the sieve holes 6 during the inflow process and be blocked on the side close to the input pipe 2, while small-particle oil and fluid can flow out through the sieve holes 6 to the side of the output pipe 3. At this time, after the side close to the input pipe 2 is scraped by the cleaning rod 7, a small amount of small-particle impurities will remain in the sieve holes 6. By flipping the orientation of the filter plate 5, the small-particle impurities remaining in the sieve holes 6 can be turned to the side close to the output pipe 3. During the subsequent oil transportation process, the impact of the oil can wash out the impurities on this side from the sieve holes 6 and flow out through the output pipe 3. At this time, the impact of the small-particle impurities flowing out on the blockage of the pipeline valve can be ignored.

[0040] After that, the valve is opened again, and the communication hole 19 rotates to a state connected to the housing 1. At this time, the outer wall of the control shaft 18 pushes the control key 23 to compress, and the operation of the electric telescopic rod 21 will not be triggered. The oil can be filtered through the filter plate 5 again and output into the output pipe 3 for discharge. This device does not require manual control. Only by opening and closing the valve, it can automatically switch the orientation of the filter plate 5 and achieve self-cleaning of impurities when the valve is closed. The cleaning is more thorough and efficient, and at the same time, the blockage of the filter plate 5 is avoided, extending the overall service life of the equipment.

[0041] Embodiment 2: Please refer to Figures 5-9 , this embodiment further explains Embodiment 1. The switching mechanism in the figure includes a tension spring 25 fixedly installed at the bottom of the upper cleaning rod 7. A lifting frame 26 is slidably connected to the fixed frame 12 in the vertical direction. A plurality of first helical gear blocks 27 are slidably connected to the lifting frame 26 in the horizontal direction. A second spring 28 fixedly connected to the lifting frame 26 is fixedly connected to the side of the first helical gear block 27. The bottom end of the tension spring 25 is fixedly connected to the top surface of the lifting frame 26. A plurality of second helical gear blocks 29 capable of meshing and driving with the first helical gear blocks 27 are fixedly connected to the outer wall of the rotating shaft 4 at equal intervals.

[0042] A mounting frame 30 is fixedly connected to the fixed frame 12 , and a third bevel gear block 31 capable of one-way engagement with the second bevel gear block 29 is slidably connected to the mounting frame 30 . A third spring 32 fixedly connected to the mounting frame 30 is fixedly connected to one side of the third bevel gear block 31 .

[0043] In this embodiment, when the cleaning rod 7 on the upper side moves up, the upper end of the tension spring 25 will be pulled up. At this time, since the two sides of the filter plate 5 are respectively clamped by the cleaning rod 7 and the limit frame 11, the rotating shaft 4 cannot rotate, and the lifting frame 26 cannot drive the first bevel gear block 27 to move up. When the cleaning rod 7 and the limit frame 11 slide into the storage box 9, the clamping of the two sides of the filter plate 5 is released. At this time, under the pull of the tension spring 25, the lifting frame 26 can be driven to move up, and the first bevel gear block 27 drives the second bevel gear block 29 to make the rotating shaft 4 rotate unidirectionally, and the rotation of the rotating shaft 4 is limited by the third bevel gear block 31. At this time, since the shell 1 is full of oil and the sieve hole 6 of the filter plate 5 is small, the speed of the filter plate 5 is low, which realizes the function of slowly rotating and switching the filter plate 5 during the pulling-up process of the tension spring 25.

[0044] When the filter plate 5 is fully lowered, the filter plate 5 is moved back to the bottom position, and the filter plate 5 is moved back to the bottom position by the second bevel gear block 27.

[0045] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0046] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wellhead valve for removing impurities in a retrievable pipeline during oil extraction, characterized in that, Including: A housing, with an input pipe and an output pipe connected to the side of the housing in a communicating manner; Also including: A filtering mechanism, which includes a rotating shaft rotatably connected to the inner wall of the housing. Two groups of filter plates are evenly and fixedly connected to the outer wall of the rotating shaft. The outer walls of the two groups of filter plates are slidably attached to the inner wall of the housing. Multiple groups of sieve holes are evenly formed in the filter plates, and are used to filter the petroleum flowing in from one side of the input pipe through the sieve holes in the filter plates, and convey the filtered petroleum to the output pipe; A cleaning mechanism, which includes two cleaning rods installed in the housing. The side walls of the two cleaning rods are slidably attached to the outer walls of the two filter plates respectively, and are used to synchronously remove the impurities on the side of the two filter plates close to the input pipe through the cleaning rods, and at the same time can reinforce and limit the edges of the filter plates when resetting; A switching mechanism, which is installed in the housing and is used to drive the rotating shaft to rotate 180° when one side of the filter plate is cleaned by the cleaning rod, so that the positions and orientations of the two filter plates are switched. Then, the small particle impurities that are not cleaned in the sieve holes are pushed to the side of the output pipe for discharge by the flow of petroleum. The cleaning mechanism also includes a sealing frame fixedly installed on the side of the cleaning rod. Storage boxes are fixedly connected to both the upper and lower sides of the housing. Communication grooves communicating with the storage boxes are formed on the housing. A limiting frame for reinforcing and limiting the edge position of the filter plate far from the input pipe side is fixedly connected to the side of the sealing frame. Both the sealing frame and the limiting frame are slidably connected to the inner wall of the communication groove in the vertical direction. A driving member for synchronously adjusting the movement of the two cleaning rods is provided on the housing. The driving member includes fixed frames fixedly installed on both sides of the housing. Guide grooves for slidably connecting the two cleaning rods in the vertical direction are respectively formed on the housing and the fixed frames. Guide frames are respectively fixedly connected to both fixed frames. A guide block is slidably connected to the guide frame in the horizontal direction. Two rotating rods respectively rotatably connected to one end of the two cleaning rods are rotatably connected to the guide block. A control member for controlling the sliding state of the guide block according to the opening and closing state of the output pipe is provided on the guide frame. The switching mechanism includes a tension spring fixedly installed at the bottom of the upper cleaning rod. A lifting frame is slidably connected to the fixed frame in the vertical direction. Multiple first helical teeth are evenly slidably connected to the lifting frame in the horizontal direction. A second spring fixedly connected to the lifting frame is fixedly connected to the side of the first helical tooth. The bottom end of the tension spring is fixedly connected to the top surface of the lifting frame. Multiple second helical teeth capable of meshing and driving with the first helical teeth are evenly fixedly connected to the outer wall of the rotating shaft.

2. The wellhead valve for removing impurities in the retrievable pipeline for oil extraction according to claim 1, characterized in that: The control member includes a control box fixedly installed on the output pipe. A control shaft is rotatably connected to the control box. A communication hole for communicating the housing and the output pipe is formed on the control shaft. A knob for controlling the orientation of the communication hole is provided on the control shaft. A synchronizing member for synchronously adjusting the sliding state of the guide block according to the orientation of the communication hole is provided on the control box.

3. The wellhead valve for removing impurities in a retrievable pipeline for oil extraction according to claim 2, characterized in that: The synchronizing member includes an electric telescopic rod fixedly installed on a set of guiding frames. The telescopic end of the electric telescopic rod is fixedly connected to the side surface of a set of guiding blocks with close distances. A fixed box is fixedly connected to the side surface of the control box. A control key is slidably connected inside the fixed box. One end of the control key is fixedly connected to a first spring fixedly connected to the fixed box. Each time the control key pops out, it can drive the electric telescopic rod to perform a reciprocating telescopic operation once.

4. A wellhead valve for removing impurities in a retrievable pipeline for oil extraction according to claim 1, characterized in that: An installation frame is fixedly connected inside the fixed frame. A third helical gear block that can be unidirectionally clamped with the second helical gear block is slidably connected inside the installation frame. One side of the third helical gear block is fixedly connected to a third spring fixedly connected to the installation frame.

5. The wellhead valve for removing impurities in a retrievable pipeline during oil extraction according to claim 1, characterized in that: A fourth spring is fixedly connected inside the storage box. One end of the fourth spring is fixedly connected to a pushing plate that can push most of the impurities in the cleaning rod and the sealing frame into the storage box for storage. Collection pipes are respectively connected and communicated to the side surfaces of the two storage boxes. A collection box is fixedly connected to the side surface of the housing. The two collection pipes are both connected and communicated to the side surface of the collection box.

6. The wellhead valve for removing impurities in the retrievable pipeline for oil extraction according to claim 1, characterized in that: Both ends of the sieve holes are designed with tapered openings, so that the opening diameters at both ends are larger than the inner wall diameter at the middle position.

7. The wellhead valve for removing impurities in the retrievable pipeline for oil extraction according to claim 1, characterized in that: Sealing boxes are respectively fixedly connected to the side surfaces of the two fixed frames.

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