A detection device for valve body of mud pump

Abstract

The present invention relates to the technical field of detection devices, and discloses a detection device for a valve body of a mud pump, comprising: a test bench; a pump body simulation mechanism, which is arranged on the test bench, and comprises: a pump body, a mounting assembly and a pressure assembly; the mounting assembly comprises: an end cover, a connecting shaft, a supporting spring and a pressing member, the end cover is connected to the end of the pump body by a thread, the connecting shaft is fixed to the bottom of the end cover, and the supporting spring is fixed to the bottom of the connecting shaft. The mounting assembly provided by the present invention adopts a sliding guide design of a limiting protrusion and a limiting groove, combined with the threaded connection action of the end cover, so that the pressing contact part completely avoids rotational friction during the vertical pressure application process, and the rubber protective pad at the bottom of the pressing contact part cooperates with the truncated cone-shaped thin plate structure, which not only ensures the uniform force of the valve seat, but also effectively prevents the surface wear caused by metal contact during the installation process.

Description

Technical Field

[0001] The present invention relates to the technical field of detection devices, and more specifically, to a detection device for a valve body of a mud pump. Background Art

[0002] The valve body used in mud pumps is the core component for controlling the unidirectional flow of the medium in the pump. It is usually made of high-hardness alloy and adopts a conical or flat sealing structure. It has extremely strong wear resistance, erosion resistance and corrosion resistance. Through the precision-machined sealing surface and valve core, it can achieve reliable opening and closing in high-pressure, high-sand content and corrosive medium environments, ensuring that the mud pump can efficiently and stably transport the medium. It is widely used in oil drilling, mine slag discharge and other fields. Its design must take into account dynamic sealing, fatigue resistance and quick replacement convenience. Therefore, it must pass strict non-destructive testing and pressure test verification during the manufacturing process.

[0003] However, when performing wear testing on the valve body, it is generally installed in a special experimental testing device, and the actual use environment in the mud pump is simulated by the experimental testing device. After that, the valve body after the experiment is tested for wear to obtain the required wear test data. The valve body of the mud pump is the core component for controlling the unidirectional flow of the medium. Its high-hardness alloy material and conical / flat precision sealing structure need to achieve high-frequency reliable opening and closing dozens of times per minute under high pressure, high sand content and corrosive mud environment. In order to ensure its dynamic sealing and fatigue life, the performance needs to be verified by non-destructive testing and pressure testing during the manufacturing process. The traditional testing device adopts a threaded pressing method. During the installation process, rotational friction is generated between the clamping part and the valve seat, resulting in spiral scratches with a depth of microns on the high-cost precision sealing surface, which directly affects the sealing performance in subsequent actual working conditions. Summary of the invention

[0004] The object of the present invention is to provide a detection device for a valve body of a mud pump to solve the above-mentioned technical problems.

[0005] The present invention solves the above-mentioned technical problems through the following technical solutions:

[0006] The present invention provides a detection device for a valve body of a mud pump, comprising:

[0007] Experimental bench;

[0008] The pump body simulation mechanism is arranged on the experimental table, and includes: a pump body, a mounting assembly and a pressure assembly;

[0009] The installation assembly includes: an end cover, a connecting shaft, a support spring and a pressing piece, the end cover is connected to the end of the pump body by a thread, the connecting shaft is fixed to the bottom of the end cover, the support spring is fixed to the bottom end of the connecting shaft, and the pressing piece is rotatably sleeved on the bottom end of the connecting shaft, which includes: a connecting part, a hydraulic clamping part for clamping the installed valve body, and a plurality of pressing contact parts evenly distributed on the circumference of the connecting part;

[0010] A limiting protrusion is provided at the bottom of the pressing contact portion, and a limiting groove that is slidably matched with the limiting protrusion is provided on the inner side of the pump body. The hydraulic clamping includes a first piston rod, a first hydraulic oil chamber provided in the connecting shaft, and a clamping claw structure. The clamping claw is controlled to extend and retract by driving the first piston rod to clamp the top of the installed valve body.

[0011] The pressure component is used to provide pressure to the inner cavity of the pump body so that the valve body can repeatedly open and close;

[0012] The mud circulation mechanism connects the input end and the output end of the pump body to form a mud closed loop;

[0013] The data acquisition module is used to monitor the mud parameters in real time and feed back to the control system.

[0014] As a further optimization scheme of the present invention, the bottom end of the first piston rod penetrates into the first hydraulic oil chamber from the top of the end cover, and its outer side is threadedly matched with the end cover; a plurality of connecting holes are opened at the bottom of the connecting shaft, the number of which matches the clamping structure and passes through the first hydraulic oil chamber, so that the second hydraulic oil chamber forms a hydraulic passage with the first hydraulic oil chamber through the corresponding connecting holes.

[0015] As a further optimization scheme of the present invention, the clamping jaw structure includes a second hydraulic oil chamber, a micro clamping jaw and a connecting spring. The second hydraulic oil chamber is arranged in the clamping contact portion, and the bottom end of the second hydraulic oil chamber is connected to the inside of the corresponding limiting protrusion. The first hydraulic oil chamber and the second hydraulic oil chamber are both filled with hydraulic oil. The micro clamping jaw is slidably installed on the bottom of the corresponding limiting protrusion. The connecting spring is sleeved on the outside of the micro clamping jaw, and the end of the connecting spring is fixed to the inner side of the corresponding limiting protrusion.

[0016] As a further optimization solution of the present invention, a connecting short pipe is detachably mounted on the output end of the pump body, and the bottom thread of the end cover is sleeved on the top of the connecting short pipe.

[0017] As a further optimization solution of the present invention, a rotating handle is fixedly mounted on the outer side of the end cover, and a sealing ring is provided on the inner side of the end cover.

[0018] As a further optimization solution of the present invention, the number of the pressing contact parts is two, and the pressing contact part is a truncated cone-shaped thin plate, and a protective pad is provided at the bottom of the thin plate.

[0019] As a further optimization scheme of the present invention, the pressure assembly includes a hydraulic cylinder and a second piston rod, the hydraulic cylinder is fixedly mounted on the top of the test bench, and the second piston rod is slidably mounted on the inner side of the pump body, one side of which is fixed to the telescopic end of the hydraulic cylinder.

[0020] As a further optimization scheme of the present invention, the mud circulation mechanism includes a circulation pump, a mud mixing assembly and three delivery pipes. The circulation pump is fixedly installed on the top of the experimental bench. The input end of the circulation pump is connected to the output end of the mud mixing assembly through the delivery pipe. The output end of the circulation pump is connected to the input end of the pump body through the delivery pipe. The input end of the mud mixing assembly is connected to one side of the connecting short pipe.

[0021] As a further optimization scheme of the present invention, the mud mixing assembly includes a mixing container, a stirring motor and a stirring blade. The mixing container is fixedly installed on the top of the laboratory bench, the stirring motor is fixedly installed on the top of the mixing container, and the stirring blade is arranged in the mixing container, and the top end of the stirring blade is fixed to the rotating end of the stirring motor.

[0022] As a further optimization solution of the present invention, the data acquisition module includes a plurality of flow sensors, pressure sensors and temperature sensors, and the flow sensors, pressure sensors and temperature sensors are respectively installed on the delivery pipe and the pump body.

[0023] The beneficial effects of the present invention are:

[0024] The installation assembly provided in the present invention significantly improves the operational efficiency and equipment protection performance of valve body detection through innovative structural design and coordinated cooperation mechanism, which is mainly reflected in the following technical effects:

[0025] (1) The sliding guide design of the limiting protrusion and the limiting groove, combined with the threaded connection action of the end cover, can completely avoid rotational friction of the pressing contact part during the vertical pressure application process. The rubber protective pad at the bottom of the pressing contact part cooperates with the frustum-shaped thin plate structure, which not only ensures the uniform force of the valve seat, but also effectively prevents the surface wear caused by metal contact during installation;

[0026] (2) The dual-mode operation mechanism of the hydraulic clamping part (contracting during testing / expanding during disassembly) provides double protection. During the test, the elastic contact of the support spring on the top of the valve body is used to achieve dynamic pressure compensation. During disassembly, the hydraulic clamping part is expanded to form a mechanical clamping force, which forms a mechanical coupling with the synchronous lifting of the connecting shaft to ensure that the valve body can be removed as a whole without damage.

[0027] (3) Through the linkage design of threaded connection and limit mechanism, the installation process is compressed into three consecutive actions: alignment, tightening and pressing, through the steps of rotating end cover, limit slide guide, spring pre-tightening and pressing contact, which reduces the installation time. During reverse disassembly, the valve body and the installation assembly can be separated synchronously through the timing coordination of hydraulic clamping and thread loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a detection device for a valve body of a mud pump provided by the present invention;

[0029] Figure 2 It is a structural schematic diagram between a pump body simulation mechanism and a mud circulation mechanism in a detection device for a valve body of a mud pump provided by the present invention;

[0030] Figure 3 It is a cross-sectional view between a mounting assembly and a connecting short pipe in a detection device for a valve body of a mud pump provided by the present invention;

[0031] Figure 4 It is an exploded view between a mounting assembly and a connecting short pipe in a detection device for a valve body of a mud pump provided by the present invention;

[0032] Figure 5 It is a structural schematic diagram of the installation components and the interior of the connecting short pipe in a detection device for a valve body of a mud pump provided by the present invention;

[0033] Figure 6 The present invention Figure 5 A local enlarged schematic diagram of the middle A;

[0034] Figure 7 The present invention Figure 5 A partial enlarged schematic diagram of point B in the middle;

[0035] Figure 8 It is a schematic diagram of the structure inside the pump body of a detection device for a valve body of a mud pump provided by the present invention;

[0036] Fig. 9 The present invention is a schematic structural diagram of a mud circulation mechanism in a detection device for a valve body of a mud pump provided by the present invention.

[0037] In the figure: 1. experimental table; 2. pump body simulation mechanism; 21. pump body; 22. installation assembly; 221. end cover; 222. connecting shaft; 223. support spring; 224. pressing piece; 2241. limiting protrusion; 2242. limiting groove; 2243. first piston rod; 2244. first hydraulic oil chamber; 2245. second hydraulic oil chamber; 2246. micro clamp; 2247. connecting spring; 2248. connecting hole; 225. rotating handle; 23. pressure assembly; 231. hydraulic cylinder; 232. second piston rod; 24. connecting short pipe; 3. mud circulation mechanism; 31. circulation pump; 32. delivery pipe; 33. mixing container; 34. stirring motor; 35. stirring blade; 4. valve seat; 5. valve body. DETAILED DESCRIPTION

[0038] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Each example may omit, replace or add various processes or components as needed. In addition, the features described relative to some examples may also be combined in other examples.

[0039] Please refer to Figures 1 to 4A mud pump valve body detection device includes: a test bench 1, a pump body simulation mechanism 2, a mud circulation mechanism 3 and a data acquisition module. Among them, the pump body simulation mechanism 2 is arranged on the experimental bench 1, and includes: a pump body 21, a mounting assembly 22 and a pressure assembly 23; the mounting assembly 22 is arranged on one side of the pump body 21, and includes: an end cover 221, a connecting shaft 222, a support spring 223 and a clamping piece 224. The end cover 221 and the connecting end of the pump body 21 are detachably threadedly connected, the connecting shaft 222 is fixedly installed at the bottom of the end cover 221, the support spring 223 is fixedly installed at the bottom end of the connecting shaft 222, and the clamping piece 224 is arranged at the bottom end of the connecting shaft 222. The clamping piece 224 includes a connecting part, a hydraulic clamping part and two clamping contact parts. The connecting part is rotatably sleeved on the bottom end of the connecting shaft 222, and the two clamping contact parts are evenly distributed on the outside of the connecting part. The clamping contact part is a truncated cone-shaped thin plate, and a protective pad is provided at the bottom of the thin plate. The protective pad can be a rubber pad to avoid wear on the valve body when it contacts the valve body. The bottom ends of the two pressing contact parts are fixed with limiting protrusions 2241, and the inner side of the pump body 21 is provided with limiting grooves 2242 used for sliding with the limiting protrusions 2241. The hydraulic clamping part is used to clamp the installed valve body, and the pressure assembly 23 is used to provide pressure to the inner cavity of the pump body 21 so that the valve body can repeatedly open and close. The mud circulation mechanism 3 is arranged on the experimental table 1, which is connected to the input end and the output end of the pump body 21 respectively, and is used to circulate the mud inside the pump body 21, and is used to simulate the mud circulation environment in which the valve body is located in the mud pump. The data acquisition module is used to collect various data information of the mud in real time, and feed back the collected data information to the control system in real time.

[0040] It should be noted that when the above-mentioned detection device is in use, the valve body is placed in the preset installation cavity of the pump body 21, and then the installation assembly 22 is connected to the end of the pump body 21, and the two limiting protrusions 2241 on the pressing piece 224 are aligned with the two limiting grooves 2242 on the pump body 21 respectively, and then the limiting protrusions 2241 and the limiting grooves 2242 are matched and slidably docked, and the end cover 221 is slowly placed downward, so that the limiting protrusions 2241 slowly slide along the limiting grooves 2242, and the end cover 221 gradually approaches the end of the pump body 21. After the bottom of the end cover 221 contacts the pump body 21, the end cover 221 is further rotated to be threadedly connected to the end of the pump body 21. At the same time, the connecting shaft 222 and the supporting spring 223 move downward with the end cover 221. Since the pressing contact part and the connecting part are pressed on the limiting protrusions 2241 Under the limiting effect of , it will not rotate with the end cover 221, but will move down smoothly. When the end cover 221 can no longer rotate, the bottom of the support spring 223 is in contact with the middle of the top of the valve body 5 of the valve body, and the pressing contact portion is in contact with the top of the valve seat 4 of the valve body, generating a downward squeezing force on the valve seat 4, so that the valve seat 4 can be stably connected to the pump body 21, thus realizing the rapid installation of the valve body. Through the coordinated arrangement of the end cover 221 and the pressing piece 224, during the process of the end cover 221 rotating and threadedly connected to the pump body 21, only a vertical squeezing force can be applied to the top of the valve seat 4 without generating rotational friction, which can play a certain protective role on the valve seat 4. In addition, this installation method can automatically release the fixing effect on the valve seat 4 after the end cover 221 is separated from the pump body 21, so that the valve body can be quickly removed. After the test is completed, the hydraulic clamping part is adjusted to the expanded state to clamp the upper end of the valve seat 4, and then the end cover 221 is rotated to gradually move up and separate from the pump body 21, and the connecting part and the clamping piece 224 also move up with the end cover 221. Under the clamping action of the hydraulic clamping part, the entire valve body can be driven to move up together, and finally the valve body is taken out of the pump body 21. In this way, the function of synchronous and rapid removal of the valve body is realized.

[0041] Please refer to Figures 3 to 7The hydraulic clamping part includes a piston rod, a first hydraulic oil chamber 2244 and a clamping claw structure with the same number as the clamping contact part. The first hydraulic oil chamber 2244 is arranged inside the connecting shaft 222. The bottom end of the first piston rod 2243 extends from the top of the end cover 221 to the first hydraulic oil chamber 2244. The outer side of the first piston rod 2243 is connected to the internal thread of the end cover 221. A plurality of connecting holes 2248 with the same number as the clamping claw structure are provided at the bottom of the connecting shaft 222. The connecting holes 2248 are connected to the bottom of the first hydraulic oil chamber 2244. The clamping structure includes a second hydraulic oil chamber 2245, a micro clamping jaw 2246 and a connecting spring 2247. The second hydraulic oil chamber 2245 is arranged in the thin plate. The bottom end of the second hydraulic oil chamber 2245 is connected to the inside of the corresponding limiting protrusion 2241. The first hydraulic oil chamber 2244 and the second hydraulic oil chamber 2245 are both filled with hydraulic oil. The micro clamping jaw 2246 is slidably installed on the bottom of the corresponding limiting protrusion 2241. The connecting spring 2247 is sleeved on the outside of the micro clamping jaw 2246, and the end of the connecting spring 2247 is fixed to the inner side of the corresponding limiting protrusion 2241.

[0042] It should be noted that when the above-mentioned hydraulic clamping part is in use, the test of the valve body has been completed and the valve body needs to be taken out. After the limiting protrusion 2241 and the limiting groove 2242 slide in cooperation, the two connecting holes 2248 are connected to the two second hydraulic oil chambers 2245 accordingly. By rotating the first piston rod 2243, it starts to move downward. The hydraulic oil in the first hydraulic oil chamber 2244 is pushed by the first piston rod 2243, flows out from the two connecting holes 2248 respectively, and enters the corresponding second hydraulic oil chamber 2245. As the hydraulic oil in the second hydraulic oil chamber 2245 increases, the end of the micro clamp 2246 can be pushed to make it start to extend downward, and the connecting spring 2247 The micro-grips 2246 are then synchronously squeezed by the micro-grips 2246, and the downwardly moved micro-grips 2246 gradually come into contact with the upper end of the valve seat 4. When the micro-grips 2246 extend to the maximum elongation and no longer move, the first piston rod 2243 is difficult to rotate at this time, and the two micro-grips 2246 are used to clamp the two sides of the valve seat 4 respectively. After that, by rotating the end cover 221, the pressing contact part, the limiting protrusion 2241 and the micro-grips 2246 are moved upward together, and the entire valve body is also synchronously moved upward under the driving action of the micro-grips 2246 until the end cover 221 is separated from the end of the pump body 21, and the valve body can be easily taken out from the pump body 21, eliminating the need to manually take out the valve body alone, thereby reducing the difficulty of taking out.

[0043] Please refer to Figure 3 and Figure 4 A connecting short pipe 24 is detachably mounted on the output end of the pump body 21 , and the bottom thread of the end cover 221 is sleeved on the top of the connecting short pipe 24 .

[0044] It should be noted that the provision of a detachable connecting short tube 24 can facilitate the cleaning of the test cavity inside the pump body 21. At the same time, when the valve body is difficult to remove due to being installed too tightly, the connecting short tube 24 can be removed, and the valve body can be pushed upward from the bottom of the connecting short tube 24 to finally remove the valve body.

[0045] Please refer to Figure 4 A rotating handle 225 is fixedly installed on the outer side of the end cover 221. By adding the rotating handle 225, the end cover 221 can be easily rotated. A sealing ring is provided on the inner side of the end cover 221. The sealing ring is a conventional rubber sealing ring, which can seal the connection between the end cover 221 and the pump body 21.

[0046] Please refer to Figure 2 and Figure 8 The pressure assembly 23 includes a hydraulic cylinder 231 and a second piston rod 232 . The hydraulic cylinder 231 is fixedly mounted on the top of the experimental platform 1 . The second piston rod 232 is slidably mounted on the inner side of the pump body 21 , and one side of the second piston rod 232 is fixed to the telescopic end of the hydraulic cylinder 231 .

[0047] Please refer to Figure 2 and Fig. 9 The mud circulation mechanism 3 includes a circulation pump 31, a mud mixing assembly and three delivery pipes 32. The circulation pump 31 is fixedly mounted on the top of the experimental platform 1. The input end of the circulation pump 31 is connected to the output end of the mud mixing assembly through the delivery pipe 32. The output end of the circulation pump 31 is connected to the input end of the pump body 21 through the delivery pipe 32. The input end of the mud mixing assembly is connected to one side of the connecting short pipe 24. The mud mixing assembly includes a mixing container 33, a stirring motor 34 and a stirring blade 35. The mixing container 33 is fixedly mounted on the top of the experimental platform 1. The stirring motor 34 is fixedly mounted on the top of the mixing container 33. The stirring blade 35 is arranged in the mixing container 33, and its top end is fixed to the rotating end of the stirring motor 34.

[0048] It should be noted that when the above-mentioned pressure assembly 23 and mud circulation mechanism 3 are in use, the testing of the valve body installed in the pump body 21 is started. The prepared mud stored inside the mixing container 33 is pumped out through the circulation pump 31, and then directly transported into the pump body 21 through the delivery pipe 32. At the same time, as the hydraulic cylinder 231 extends, the second piston rod 232 can be driven to extend into the pump body 21. Since a check valve is provided on the delivery pipe 32 communicating with the input end of the pump body 21, under the pushing action of the second piston rod 232, the mud inside the pump body 21 can push the valve body 5 of the valve body upward, and the support spring 223 is synchronously contracted under the extrusion of the valve body 5. At this time, the valve body is opened, and the mud flows into the connecting short pipe 24 and then returns to the mixing container 33 through the connecting short pipe 24. The stirring motor 34 drives the stirring blade 35 to rotate, thereby stirring the returned mud to prevent mud precipitation. When the hydraulic cylinder 231 contracts, the second piston rod 232 is driven to reset, and the valve body 5 synchronously moves downward under the elastic force of the support spring 223 and closes with the valve seat 4. Then the delivery pump continues to transport mud into the pump body 21. In this way, the valve body completes an opening and closing action in sequence. By repeating such actions, the working state of the valve body opening and closing repeatedly can be simulated. After the test is completed, the valve body is taken out, and the wear degree of the valve body is judged by weighing, appearance inspection, etc. of the valve body.

[0049] The data acquisition module includes a number of flow sensors, pressure sensors, and temperature sensors, which are respectively installed on the delivery pipe 32 and the pump body 21.

[0050] It should be noted that since the above-mentioned various sensors belong to the prior art, their models and principles will not be disclosed here. The various data of the mud are collected in real time through the above-mentioned various sensors to obtain accurate test data.

[0051] The above has described the embodiments of the specific implementation manner, but this embodiment is not limited to the above specific implementation manner. The above specific implementation manner is only illustrative and not restrictive. Under the inspiration of this embodiment, those of ordinary skill in the art can also make many forms, all of which fall within the protection scope of this embodiment.

Claims

1. A detection device for a mud pump valve body, characterized in that: include: Experimental bench; The pump body simulation mechanism is arranged on the experimental table, and includes: a pump body, a mounting assembly and a pressure assembly; The installation assembly includes: an end cover, a connecting shaft, a support spring and a pressing piece, the end cover is connected to the end of the pump body by a thread, the connecting shaft is fixed to the bottom of the end cover, the support spring is fixed to the bottom end of the connecting shaft, and the pressing piece is rotatably sleeved on the bottom end of the connecting shaft, which includes: a connecting part, a hydraulic clamping part for clamping the installed valve body, and a plurality of pressing contact parts evenly distributed on the circumference of the connecting part; A limiting protrusion is provided at the bottom of the pressing contact portion, and a limiting groove that is slidably matched with the limiting protrusion is provided on the inner side of the pump body. The hydraulic clamping portion includes a first piston rod, a first hydraulic oil chamber provided in the connecting shaft, and a clamping claw structure. The clamping claw is controlled to extend and retract by driving the first piston rod to clamp the top end of the installed valve body. The pressure assembly is used to provide pressure to the inner cavity of the pump body so that the valve body can repeatedly open and close. The mud circulation mechanism connects the input end and the output end of the pump body to form a mud closed loop; The data acquisition module is used to monitor the mud parameters in real time and feed back to the control system.

2. A detection device for a mud pump valve body according to claim 1, characterized in that: The bottom end of the first piston rod penetrates into the first hydraulic oil chamber from the top of the end cover, and its outer side is threadedly matched with the end cover; a plurality of connecting holes are provided at the bottom of the connecting shaft, the number of which matches the clamping structure and passes through the first hydraulic oil chamber, so that the second hydraulic oil chamber forms a hydraulic passage with the first hydraulic oil chamber through the corresponding connecting holes.

3. A detection device for a valve body of a mud pump according to claim 2, characterized in that: The clamping jaw structure includes a second hydraulic oil chamber, a micro clamping jaw and a connecting spring. The second hydraulic oil chamber is arranged in the clamping contact portion. The bottom end of the second hydraulic oil chamber is connected to the inside of the corresponding limiting protrusion. The first hydraulic oil chamber and the second hydraulic oil chamber are both filled with hydraulic oil. The micro clamping jaw is slidably installed on the bottom of the corresponding limiting protrusion. The connecting spring is sleeved on the outside of the micro clamping jaw, and the end of the connecting spring is fixed to the inner side of the corresponding limiting protrusion.

4. A detection device for a valve body of a mud pump according to claim 3, characterized in that: The output end of the pump body is detachably provided with a connecting short pipe, and the bottom thread of the end cover is sleeved on the top of the connecting short pipe.

5. A detection device for a valve body of a mud pump according to claim 4, characterized in that: A rotating handle is fixedly mounted on the outer side of the end cover, and a sealing ring is arranged on the inner side of the end cover.

6. A detection device for a valve body of a mud pump according to claim 5, characterized in that: There are two pressing contact parts, each of which is a truncated cone-shaped thin plate, and a protective pad is provided at the bottom of the thin plate.

7. A detection device for a valve body of a mud pump according to claim 6, characterized in that: The pressure assembly includes a hydraulic cylinder and a second piston rod. The hydraulic cylinder is fixedly installed on the top of the experimental table. The second piston rod is slidably installed on the inner side of the pump body, and one side of the second piston rod is fixed to the telescopic end of the hydraulic cylinder.

8. A detection device for a valve body of a mud pump according to claim 7, characterized in that: The mud circulation mechanism includes a circulation pump, a mud mixing assembly and three delivery pipes. The circulation pump is fixedly installed on the top of the experimental bench. The input end of the circulation pump is connected to the output end of the mud mixing assembly through the delivery pipe. The output end of the circulation pump is connected to the input end of the pump body through the delivery pipe. The input end of the mud mixing assembly is connected to one side of the connecting short pipe.

9. A detection device for a valve body of a mud pump according to claim 8, characterized in that: The mud mixing assembly includes a mixing container, a stirring motor and a stirring blade. The mixing container is fixedly installed on the top of the laboratory table, the stirring motor is fixedly installed on the top of the mixing container, and the stirring blade is arranged in the mixing container, and the top end of the stirring blade is fixed to the rotating end of the stirring motor.

10. A detection device for a valve body of a mud pump according to claim 9, characterized in that: The data acquisition module includes a plurality of flow sensors, pressure sensors and temperature sensors, which are respectively installed on the delivery pipe and the pump body.

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