Pump cover nut for ultrahigh-pressure plunger pressure pump for shale gas exploitation

Abstract

The invention discloses a pump cover nut for a shale gas exploitation ultrahigh pressure plunger pressure pump, which comprises a nut, a connecting pipe connected to the right side of the nut, a filter pipe in threaded connection with the interior of the connecting pipe, and a connecting assembly arranged on one side of the nut, a cleaning mechanism is arranged in the filter pipe, an auxiliary mechanism is arranged on one side of the nut, the sealing ring is fixedly connected with the inner side of the mounting frame, one end of the first spring is fixedly connected with the movable block, the slope clamping block movably penetrates through the mounting frame and is clamped with the groove, and the outer side of the movable block is fixedly connected with the pull rod. And one end of the second spring is fixedly connected with the ejection block. The problems that according to an existing device, a filter screen is not convenient to clean manually due to the fact that the filter screen is not convenient to disassemble manually, filter holes are prone to being blocked after the filter screen is used for a long time, and follow-up use is affected are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of pump cover nuts, and specifically to a pump cover nut for an ultra-high pressure plunger pressure pump in shale gas extraction. Background Technique

[0002] A pump cover nut is a nut used on a pump body and is widely used in fields such as automobiles, construction sites, and water rooms, with good usage effects. Generally, it is made of metal materials such as carbon steel and stainless steel. The pump cover nut made of carbon steel has high strength and hardness and can withstand large tightening forces, being suitable for pumps under general working conditions. The pump cover nut made of stainless steel has good corrosion resistance and is suitable for pumps that transport corrosive liquids or work in humid and corrosive environments, which can prevent the nut from rusting and corroding and ensure the reliability of the connection. In some special occasions, such as extreme working conditions of high temperature, high pressure, and strong corrosion, pump cover nuts made of special materials such as copper alloys and nickel-based alloys may be used to meet higher performance requirements. To ensure the sealing performance and connection reliability under ultra-high pressure, the threads of the pump cover nut usually may have a larger pitch and a deeper thread profile to increase the contact area and load-bearing capacity of the threads.

[0003] According to a pump cover nut for an ultra-high pressure plunger pressure pump in shale gas extraction disclosed in the patent publication number CN 208966563 U, this device is provided with a first adjustment screw, a second adjustment screw, a filter pipe, and an internal hexagon rubber waterproof pad, which can conveniently adjust the pump cover nut for an ultra-high pressure plunger pressure pump in shale gas extraction, can filter the liquid passing through the pump cover nut for an ultra-high pressure plunger pressure pump in shale gas extraction, and can prevent the liquid from flowing out through the counterbore, bringing convenience to the use of the pump cover nut for an ultra-high pressure plunger pressure pump in shale gas extraction, having a certain practicality and bringing a better usage prospect; however, this device is not convenient for manual disassembly of the filter net, thus not convenient for manual cleaning of the filter net. After long-term use of the filter net, the filter holes are prone to blockage, thus affecting subsequent use.

[0004] Therefore, we propose a pump cover nut for an ultra-high pressure plunger pressure pump in shale gas extraction to solve the problem. Summary of the Invention

[0005] The purpose of the present invention is to provide a pump cover nut for an ultra-high pressure plunger pressure pump in shale gas extraction to solve the problems raised in the above background technique.

[0006] To solve the above technical problems, the present invention provides the following technical solution: A pump cover nut for an ultra-high pressure plunger pressure pump in shale gas extraction, including a nut; A connecting pipe connected to the right side of the nut; A filter pipe threadedly connected inside the connecting pipe; and a connection assembly arranged on one side of the nut, the connection assembly includes a disassembly and assembly mechanism arranged inside the filter pipe, a cleaning mechanism is arranged inside the filter pipe, and an auxiliary mechanism is arranged on one side of the nut.

[0007] According to the above technical solution, the disassembly and assembly mechanism includes a limit ring fixedly connected to the inner wall of the filter pipe. On one side of the limit ring, there is an installation frame. Inside the installation frame, a filter plate is fixedly connected. The inner wall of the filter pipe is fixedly connected with a slide rail. The outer wall of the slide rail is slidably connected with an installation frame. A groove is opened on one side of the slide rail close to the installation frame. An activity groove is opened inside the installation frame. An activity block is slidably connected to the inner wall of the activity groove. One side of the activity block is fixedly connected with an inclined surface clamping block. A first spring is fixedly connected to the inner wall of the activity groove. An activity hole is opened on the outer side of the inner wall of the activity groove. A pull rod is slidably connected to the inner wall of the activity hole. A sealing ring is arranged on one side of the limit ring close to the installation frame. A chute is opened on the inner wall of the filter pipe. A slider is slidably connected to the inner wall of the chute. A hollow column is fixedly connected to the inner wall of the chute. A solid column is sleeved inside the hollow column. The outer end of the solid column is fixedly connected with an ejecting block. A second spring is fixedly connected to the inner wall of the chute. An installation rod is fixedly installed between the installation frame and the installation frame.

[0008] According to the above technical solution, the cleaning mechanism includes a rotating shaft rotatably connected to the inside of the installation frame through a bearing. One end of the rotating shaft is fixedly connected with a spiral blade. The end of the rotating shaft away from the spiral blade is fixedly connected with a rotating rod. One side of the rotating rod is fixedly connected with a cleaning brush.

[0009] According to the above technical solution, the auxiliary mechanism includes a hexagonal through hole opened on one side of the nut. A placement groove is opened outside the hexagonal through hole. An installation ring is clamped inside the placement groove. A hexagonal rubber waterproof pad is fixedly connected to the inner side of the installation ring. A positioning groove is opened on the outer side of the nut. A positioning block is clamped to the inner wall of the positioning groove. A limiting rod is rotatably connected to the outer side of the nut through a bearing. One end of the limiting rod is movably connected with a clamping rod. A limiting block is fixedly connected to the outer end of the clamping rod. A third spring is fixedly connected to the outer side of the limiting rod. The outer side of the nut is distributed with a first clamping groove and a second clamping groove.

[0010] According to the above technical solution, the sealing ring is fixedly connected to the inner side of the installation frame. One end of the first spring is fixedly connected with the activity block. The inclined surface clamping block movably penetrates through the installation frame and is clamped with the groove. The outer side of the activity block is fixedly connected with the pull rod. Through the cooperation of the limit ring, installation frame, filter plate, slide rail, installation frame, groove, activity groove, activity block, inclined surface clamping block, first spring, activity hole, pull rod, and sealing ring, it is convenient for manual disassembly of the installation frame, thereby facilitating manual removal of the installation frame outward, and further facilitating manual cleaning of the filter plate, which can prevent the filter holes of the filter plate from being blocked and affecting subsequent use.

[0011] According to the above technical solution, one end of the second spring is fixedly connected to the ejecting block. The second spring is sleeved outside the hollow column and the solid column. The slider is fixedly connected to the mounting frame. Through the cooperation of the chute, slider, hollow column, solid column, ejecting block, and second spring, when the inclined surface block separates from the groove, the mounting frame can be ejected outwards, making it more convenient for manual disassembly of the mounting frame.

[0012] According to the above technical solution, there are three spiral blades, which are equally spaced at one end of the rotating shaft. Through the cooperation of the rotating shaft, spiral blades, rotating rod, and cleaning brush, when the liquid flows through the filter tube, under the action of the liquid flow, the spiral blades can rotate, so that the cleaning brush can self-clean the filter plate, reducing the number of times of manual disassembly of the filter plate for cleaning, and thus increasing the applicability of the device.

[0013] According to the above technical solution, the hexagonal rubber waterproof pad is adapted to the placement groove. The positioning block is fixedly connected to the mounting ring. The clamping rod is clamped with the first card slot. The clamping rod is adapted to the second card slot. The top end of the third spring is fixedly connected to the limiting block. The bottom of the limiting rod is attached to the upper part of the positioning block. Through the cooperation of the hexagonal through hole, placement groove, mounting ring, hexagonal rubber waterproof pad, positioning groove, positioning block, limiting rod, clamping rod, third spring, and second card slot, it is convenient for manual replacement of the hexagonal rubber waterproof pad with relatively large wear, and thus a better sealing effect can be achieved.

[0014] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: (1) In the present invention, by providing a disassembly and assembly mechanism, under the action of the limiting ring, mounting frame, filter plate, slide rail, mounting frame, groove, movable groove, movable block, inclined surface block, first spring, movable hole, pull rod, and sealing ring, it is convenient for manual disassembly of the mounting frame, so as to facilitate manual removal of the mounting frame outwards, and further facilitate manual cleaning of the filter plate, preventing blockage of the filter holes of the filter plate and affecting subsequent use.

[0015] (2) In the present invention, by providing a disassembly and assembly mechanism, under the action of the chute, slider, hollow column, solid column, ejecting block, and second spring, when the inclined surface block separates from the groove, the mounting frame can be ejected outwards, making it more convenient for manual disassembly operation of the mounting frame.

[0016] (3) In the present invention, by providing a cleaning mechanism, under the action of the rotating shaft, spiral blades, rotating rod, and cleaning brush, when the liquid flows through the filter tube, under the action of the liquid flow, the spiral blades can rotate, so that the cleaning brush can self-clean the filter plate, reducing the number of times of manual disassembly of the filter plate for cleaning, and thus increasing the applicability of the device.

[0017] (4) In the present invention, by providing an auxiliary mechanism, under the action of the hexagonal through hole, the placement groove, the mounting ring, the hexagonal rubber waterproof pad, the positioning groove, the positioning block, the limiting rod, the clamping rod, the third spring, and the second card slot, it is convenient for manual replacement of the hexagonal rubber waterproof pad with relatively large wear, and thus a better sealing effect can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the drawings: Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the partial sectional structure of the overall of the present invention; Figure 3 is a schematic diagram of the disassembly and assembly mechanism structure of the present invention; Figure 4 is of the present invention Figure 3 enlarged schematic diagram of the structure at A in; Figure 5 is a schematic diagram of the partial structure of the disassembly and assembly mechanism of the present invention; Figure 6 is a schematic diagram of the cleaning mechanism structure of the present invention; Figure 7 is a schematic diagram of the auxiliary mechanism structure of the present invention; In the figures: 1, nut; 2, connecting pipe; 3, connecting component; 31, disassembly and assembly mechanism; 311, limiting ring; 312, mounting frame; 313, filter plate; 314, slide rail; 315, mounting bracket; 316, groove; 317, activity groove; 318, activity block; 319, inclined surface clamping block; 3110, first spring; 3111, activity hole; 3112, pull rod; 3113, sealing ring; 3114, chute; 3115, slider; 3116, hollow column; 3117, solid column; 3118, ejecting block; 3119, second spring; 3120, mounting rod; 32, cleaning mechanism; 321, rotating shaft; 322, spiral blade; 323, rotating rod; 324, cleaning brush; 33, auxiliary mechanism; 331, hexagonal through hole; 332, placement groove; 333, mounting ring; 334, hexagonal rubber waterproof pad; 335, positioning groove; 336, positioning block; 337, limiting rod; 338, clamping rod; 339, third spring; 3310, second card slot; 4, filter pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] Embodiment 1: As Figures 1-7 shown, the present invention provides a technical solution: a pump cover nut for an ultra-high pressure plunger pressure pump in shale gas extraction, including a nut 1, a connecting pipe 2 connected to the right side of the nut 1, a filter pipe 4 threadedly connected inside the connecting pipe 2, and a connecting assembly 3 provided on one side of the nut 1. The connecting assembly 3 includes a disassembly and assembly mechanism 31 provided inside the filter pipe 4, a cleaning mechanism 32 provided inside the filter pipe 4, and an auxiliary mechanism 33 provided on one side of the nut 1. The disassembly and assembly mechanism 31 includes a limiting ring 311 fixedly connected to the inner wall of the filter pipe 4. On one side of the limiting ring 311, there is an installation frame 312. Inside the installation frame 312, a filter plate 313 is fixedly connected. The inner wall of the filter pipe 4 is fixedly connected with a slide rail 314. The outer wall of the slide rail 314 is slidably connected with an installation frame 315. A groove 316 is opened on the side of the slide rail 314 close to the installation frame 315. An activity groove 317 is opened inside the installation frame 315. An activity block 318 is slidably connected to the inner wall of the activity groove 317. On one side of the activity block 318, an inclined surface clamping block 319 is fixedly connected. A first spring 3110 is fixedly connected to the inner wall of the activity groove 317. An activity hole 3111 is opened on the outer side of the inner wall of the activity groove 317. A pull rod 3112 is slidably connected to the inner wall of the activity hole 3111. A sealing ring 3113 is provided on the side of the limiting ring 311 close to the installation frame 315. A chute 3114 is opened on the inner wall of the filter pipe 4. A slider 3115 is slidably connected to the inner wall of the chute 3114. A hollow column 3116 is fixedly connected to the inner wall of the chute 3114. A solid column 3117 is sleeved inside the hollow column 3116. The outer end of the solid column 3117 is fixedly connected with an ejecting block 3118. A second spring 3119 is fixedly connected to the inner wall of the chute 3114. An installation rod 3120 is fixedly installed between the installation frame 315 and the installation frame 312.

[0021] In this embodiment, the sealing ring 3113 is fixedly connected to the inner side of the mounting frame 312. One end of the first spring 3110 is fixedly connected to the movable block 318. The inclined surface clamping block 319 movably penetrates through the mounting bracket 315 and is clamped with the groove 316. The outer side of the movable block 318 is fixedly connected to the pull rod 3112. Through the cooperation of the limit ring 311, the mounting frame 312, the filter plate 313, the slide rail 314, the mounting bracket 315, the groove 316, the movable groove 317, the movable block 318, the inclined surface clamping block 319, the first spring 3110, the movable hole 3111, the pull rod 3112, and the sealing ring 3113, it is convenient for manual disassembly of the mounting bracket 315, so as to facilitate manual removal of the mounting frame 312 outward, and further facilitate manual cleaning of the filter plate 313, which can prevent the filter holes of the filter plate 313 from being blocked and affecting subsequent use.

[0022] Further, one end of the second spring 3119 is fixedly connected to the ejecting block 3118. The second spring 3119 is sleeved outside the hollow column 3116 and the solid column 3117. The slider 3115 is fixedly connected to the mounting bracket 315. Through the cooperation of the chute 3114, the slider 3115, the hollow column 3116, the solid column 3117, the ejecting block 3118, and the second spring 3119, when the inclined surface clamping block 319 is separated from the groove 316, the mounting bracket 315 can be ejected outward, thus making it more convenient for manual disassembly operation of the mounting bracket 315.

[0023] When it is necessary to disassemble the filter plate 313, first manually separate the filter pipe 4 from the connecting pipe 2. Then, pull the pull rod 3112 to drive the movable block 318 to move in the groove 316, so that the inclined surface clamping block 319 fixedly connected to one side of the movable block 318 can be separated from the groove 316. Subsequently, under the action of the elastic force of the second spring 3119, the ejecting block 3118 fixedly connected to the outer end of the solid column 3117 can press the slider 3115 outwards. And since the slider 3115 is fixedly connected to the mounting frame 315, the mounting frame 315 can be moved outwards. And since there is a mounting rod 3120 fixedly connected between the mounting frame 315 and the mounting frame 312, the mounting frame 312 fixedly connected to the inner end of the mounting rod 3120 can move outwards synchronously. Then, the mounting frame 315, the mounting frame 312, and the filter plate 313 can be taken outwards, which is convenient for manual cleaning of the filter plate 313, preventing the filter holes of the filter plate 313 from being blocked and affecting subsequent use. And when disassembling the mounting frame 315, the spiral blade 322 and the cleaning brush 324 can be taken out synchronously, which is convenient for manual cleaning of the spiral blade 322 and the cleaning brush 324, and thus convenient for subsequent use. Further, when it is necessary to install the mounting frame 315, only need to manually cooperate the slider 3115 fixedly connected to the side of the mounting frame 315 with the chute 3114, and with the cooperation of the slide rail 314, the mounting frame 315 can be moved inwards. And since the outer side of the inclined surface clamping block 319 is an inclined surface, when the mounting frame 315 abuts against the inclined surface clamping block 319, under the action of the elastic force of the first spring 3110, the inclined surface clamping block 319 can be pressed into the movable groove 317. And when the mounting frame 315 moves inwards, the mounting frame 312 fixedly connected to the inner end of the mounting rod 3120 can move inwards synchronously. Then, the sealing ring 3113 fixedly connected to one side of the mounting frame 312 can abut against the limiting ring 311. And at this time, the inclined surface clamping block 319 and the groove 316 are just aligned. Under the action of the elastic force of the first spring 3110, the movable block 318 can drive the inclined surface clamping block 319 to be clamped with the groove 316, so as to fix the mounting frame 315, that is, the installation operation is completed. And the installation operation is simple and convenient, which is convenient for manual disassembly and cleaning of the filter plate 313, thereby increasing the applicability of the device.

[0024] Embodiment 2: On the basis of Embodiment 1, a preferred embodiment of the pump cover nut for a shale gas extraction ultra-high pressure plunger pump provided by the present invention is as Figures 1-7 shown: The cleaning mechanism 32 includes a rotating shaft 321 rotatably connected to the inside of the mounting frame 315 through a bearing. One end of the rotating shaft 321 is fixedly connected with a spiral blade 322, and the end of the rotating shaft 321 far from the spiral blade 322 is fixedly connected with a rotating rod 323. One side of the rotating rod 323 is fixedly connected with a cleaning brush 324.

[0025] In this embodiment, there are three spiral vanes 322, which are evenly distributed at one end of the rotating shaft 321. Through the cooperation of the rotating shaft 321, the spiral vanes 322, the rotating rod 323, and the cleaning brush 324, when the liquid flows through the filter tube 4, under the action of the liquid flow, the spiral vanes 322 can be rotated, so that the cleaning brush 324 can self-clean the filter plate 313, thereby reducing the number of times of manually disassembling the filter plate 313 for cleaning, and further increasing the applicability of the device.

[0026] When the liquid passes through the filter tube 4, under the action of the liquid flow, the spiral vanes 322 can be rotated, so that the rotating shaft 321 can rotate synchronously. Furthermore, the rotating rod 323 fixedly connected to the inner end of the rotating shaft 321 can drive the cleaning brush 324 to rotate synchronously. Subsequently, the surface of the filter plate 313 can be cleaned, preventing excessive impurities from adhering to the surface of the filter plate 313. At the same time, the number of times of manually disassembling the filter plate 313 for cleaning is reduced, increasing the applicability of the device.

[0027] Embodiment 3: On the basis of Embodiment 1, a preferred embodiment of the pump cover nut for an ultra-high pressure plunger pump for shale gas extraction provided by the present invention is as Figures 1-7 shown: The auxiliary mechanism 33 includes a hexagonal through hole 331 opened on one side of the nut 1. A placement groove 332 is opened outside the hexagonal through hole 331. An installation ring 333 is clamped inside the placement groove 332. A hexagonal rubber waterproof pad 334 is fixedly connected to the inner side of the installation ring 333. A positioning groove 335 is opened on the outside of the nut 1. A positioning block 336 is clamped on the inner wall of the positioning groove 335. A limiting rod 337 is rotatably connected to the outside of the nut 1 through a bearing. One end of the limiting rod 337 is movably connected to a clamping rod 338. A limiting block is fixedly connected to the outer end of the clamping rod 338. A third spring 339 is fixedly connected to the outside of the limiting rod 337. First card slots and a second card slot 3310 are distributed on the outside of the nut 1.

[0028] In this embodiment, the hexagonal rubber waterproof pad 334 is adapted to the placement groove 332. The positioning block 336 is fixedly connected to the installation ring 333. The clamping rod 338 is clamped with the first card slot. The clamping rod 338 is adapted to the second card slot 3310. The top end of the third spring 339 is fixedly connected to the limiting block. The bottom of the limiting rod 337 is attached to the upper part of the positioning block 336. Through the cooperation of the hexagonal through hole 331, the placement groove 332, the installation ring 333, the hexagonal rubber waterproof pad 334, the positioning groove 335, the positioning block 336, the limiting rod 337, the clamping rod 338, the third spring 339, and the second card slot 3310, it is convenient for manual replacement of the hexagonal rubber waterproof pad 334 with relatively large wear, and further a better sealing effect can be achieved.

[0029] When the hexagonal rubber waterproof pad 334 needs to be replaced, first, manually pull the clamping rod 338 outwards to separate the clamping rod 338 from the first card slot. Then, manually rotate the limiting rod 337 so that the limiting rod 337 moves away from the outer side of the positioning block 336. Subsequently, manually fit the clamping rod 338 with the second card slot 3310. Under the action of the elastic force of the third spring 339, the clamping rod 338 can be clamped with the second card slot 3310, so that the limiting rod 337 can stay at a position away from the outer side of the positioning block 336. Then, the mounting ring 333 and the hexagonal rubber waterproof pad 334 can be taken out manually. Subsequently, the new mounting ring 333 and the hexagonal rubber waterproof pad 334 are snapped into the placement groove 332. Then, manually separate the clamping rod 338 from the second card slot 3310 and rotate the limiting rod 337 to re-fit the clamping rod 338 with the first card slot. Under the action of the elastic force of the third spring 339, the clamping rod 338 can be re-clamped with the first card slot, so that the limiting rod 337 can be limited on the outer side of the positioning block 336. Then, the mounting ring 333 and the hexagonal rubber waterproof pad 334 can be fixed, and the replacement operation is completed.

[0030] It should be noted that in this article, relational terms such as first and second are only used 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 term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0031] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A pump cover nut for an ultra-high pressure plunger pressure pump in shale gas extraction, comprising a nut (1); A connecting pipe (2) connected to the right side of the nut (1); A filter pipe (4) threadedly connected inside the connecting pipe (2); and a connection component (3) provided on one side of the nut (1), characterized in that: The connecting component (3) includes a disassembly and assembly mechanism (31) arranged inside the filter pipe (4), a cleaning mechanism (32) is arranged inside the filter pipe (4), and an auxiliary mechanism (33) is arranged on one side of the nut (1).

2. The pump cover nut for an ultra-high pressure plunger pressure pump used in shale gas extraction according to claim 1, characterized in that: The disassembly and assembly mechanism (31) includes a limiting ring (311) fixedly connected to the inner wall of the filter pipe (4), an installation frame (312) is arranged on one side of the limiting ring (311), a filter plate (313) is fixedly connected inside the installation frame (312), a slide rail (314) is fixedly connected to the inner wall of the filter pipe (4), an installation frame (315) is slidably connected to the outer wall of the slide rail (314), a groove (316) is opened on one side of the slide rail (314) close to the installation frame (315), a movable groove (317) is opened inside the installation frame (315), a movable block (318) is slidably connected to the inner wall of the movable groove (317), an inclined surface clamping block (319) is fixedly connected to one side of the movable block (318), a first spring (3110) is fixedly connected to the inner wall of the movable groove (317), a movable hole (3111) is opened on the outer side of the inner wall of the movable groove (317), a pull rod (3112) is slidably connected to the inner wall of the movable hole (3111), a sealing ring (3113) is arranged on one side of the limiting ring (311) close to the installation frame (315), a chute (3114) is opened on the inner wall of the filter pipe (4), a slider (3115) is slidably connected to the inner wall of the chute (3114), a hollow column (3116) is fixedly connected to the inner wall of the chute (3114), a solid column (3117) is sleeved inside the hollow column (3116), a top block (3118) is fixedly connected to the outer end of the solid column (3117), a second spring (3119) is fixedly connected to the inner wall of the chute (3114), and an installation rod (3120) is fixedly installed between the installation frame (315) and the installation frame (312).

3. The pump cover nut for an ultra-high pressure plunger pressure pump used in shale gas extraction according to claim 1, characterized in that: The cleaning mechanism (32) includes a rotating shaft (321) rotatably connected inside the installation frame (315) through a bearing, a spiral blade (322) is fixedly connected to one end of the rotating shaft (321), a rotating rod (323) is fixedly connected to the end of the rotating shaft (321) far from the spiral blade (322), and a cleaning brush (324) is fixedly connected to one side of the rotating rod (323).

4. The pump cover nut for an ultra-high pressure plunger pressure pump used in shale gas extraction according to claim 1, characterized in that: The auxiliary mechanism (33) includes a hexagonal through hole (331) opened on one side of the nut (1). A placement groove (332) is opened outside the hexagonal through hole (331). An installation ring (333) is clamped inside the placement groove (332). A hexagonal rubber waterproof pad (334) is fixedly connected to the inner side of the installation ring (333). A positioning groove (335) is opened on the outside of the nut (1). A positioning block (336) is clamped on the inner wall of the positioning groove (335). A limiting rod (337) is rotatably connected to the outside of the nut (1) through a bearing. One end of the limiting rod (337) is movably connected to a clamping rod (338). A limiting block is fixedly connected to the outer end of the clamping rod (338). A third spring (339) is fixedly connected to the outside of the limiting rod (337). A first card slot and a second card slot (3310) are distributed on the outside of the nut (1).

5. The pump cover nut for an ultra-high pressure plunger pressure pump used in shale gas extraction according to claim 2, characterized in that: The sealing ring (3113) is fixedly connected to the inner side of the installation frame (312). One end of the first spring (3110) is fixedly connected to the movable block (318). The inclined surface clamping block (319) movably penetrates through the installation frame (315) and is clamped with the groove (316). The outside of the movable block (318) is fixedly connected to the pull rod (3112).

6. The pump cover nut for an ultra-high pressure plunger pressure pump used in shale gas extraction according to claim 2, characterized in that: One end of the second spring (3119) is fixedly connected to the ejecting block (3118). The second spring (3119) is sleeved outside the hollow column (3116) and the solid column (3117). The slider (3115) is fixedly connected to the installation frame (315).

7. The pump cover nut for an ultra-high pressure plunger pressure pump used in shale gas extraction according to claim 3, wherein: The number of the spiral blades (322) is three, and they are equally spaced at one end of the rotating shaft (321).

8. The pump cover nut for an ultra-high pressure plunger pressure pump used in shale gas extraction according to claim 4, characterized in that: The hexagonal rubber waterproof pad (334) is adapted to the placement groove (332). The positioning block (336) is fixedly connected to the installation ring (333). The clamping rod (338) is clamped with the first card slot. The clamping rod (338) is adapted to the second card slot (3310). The top end of the third spring (339) is fixedly connected to the limiting block. The bottom of the limiting rod (337) is in fit with the upper part of the positioning block (336).

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