A mud pump

Abstract

The present application relates to the field of conveying pump equipment, in particular to a mud pump, which comprises a pump body, a feeding pipe and a discharging pipe, two cleaning structures are detachably connected to the feeding pipe, the cleaning structures are located at the front part of the feeding valve body, and the cleaning structures are used for cleaning hard particles at the feeding valve body and shearing and cutting mud slurry, the connecting pipe connected in series in the feeding pipe is used for guiding the mud slurry, when the feeding valve body is opened to suck material, the moving assembly pushes the filter screen to extend into the feeding valve body, so that the hard particles in the mud slurry are effectively blocked by the filter screen; at the same time, the driving assembly drives the shearing shaft to rotate, the passing mud slurry is sheared and dispersed, so that the mud slurry is restored to be in a flow state, and the filter screen is prevented from being blocked by the mud slurry; after the liquid inlet is completed, the moving assembly pushes the filter screen to reset, and in this process, the filter screen pushes the hard particles remaining at the feeding valve body outward, so that the feeding valve body can be normally closed all the time, and continuous and stable pumping operation of the mud pump is realized.

Description

Technical Field

[0001] This invention relates to the field of conveying pump equipment, specifically a mud pump. Background Technology

[0002] Mud pumps are core industrial equipment for transporting solid fluids and are widely used in oil and gas drilling, mine tailings transportation, tunnel grouting, and urban sewage treatment. Among them, hydraulically driven reciprocating double-cylinder positive displacement pumps have been increasingly widely used in recent years for transporting solid fluids with small to medium flow rates and high pressures due to their significant advantages such as stepless adjustment of flow and pressure, excellent overload protection performance, compact structure, and stable operation.

[0003] The hydraulically driven reciprocating double-cylinder positive displacement pump mainly consists of two parts: a hydraulic drive unit and a hydraulic conveying unit. The hydraulic drive unit includes a hydraulic pump station, a main hydraulic cylinder, a piston rod, and a synchronous control mechanism, which provides stable power for the reciprocating motion of the pump. The hydraulic conveying unit contains two symmetrically arranged double-acting hydraulic cylinders. Each hydraulic cylinder has an intake valve and an exhaust valve at both ends. The intake side of the two hydraulic cylinders is connected to the material pool through a common feed manifold, and the exhaust side is connected to the downstream operating pipeline through a common exhaust manifold.

[0004] When the hydraulically driven reciprocating double-cylinder positive displacement pump is working, the hydraulic system drives two main hydraulic cylinders to alternately perform reciprocating linear motion, which drives the pistons in the corresponding cylinders to move synchronously. When the piston of one cylinder moves to one end, the volume of the liquid chamber at that end decreases, the internal pressure increases, the discharge valve opens, and the suction valve closes, completing the discharge process. At the same time, the volume of the liquid chamber at the other end of the same cylinder increases, the internal pressure decreases, the suction valve opens, and the discharge valve closes, completing the suction process. The two cylinders alternately perform suction and discharge operations to achieve continuous fluid delivery. By adjusting the oil supply flow and working pressure of the hydraulic system, the pump's output flow and maximum working pressure can be flexibly changed.

[0005] However, when conveying mud containing solid impurities such as sand, rock fragments, and lumps, hydraulically driven reciprocating double-cylinder positive displacement pumps suffer from valve body jamming, which becomes the core bottleneck restricting their reliability and service life. Hard particles and lumps in the mud pass through the valve body with the mud fluid, making it easy for hard particles to get stuck in the valve body when the valve body is closed. This results in the valve body not closing tightly, causing high-pressure fluid leakage, which greatly reduces the volumetric efficiency of the pump. In severe cases, it can even lead to valve body damage and machine shutdown.

[0006] In addition, when slurry clumps form during transportation or settling and enter the valve body, they not only affect the normal opening and closing of the valve body, but may also block the flow channel and reduce the liquid feeding efficiency. Therefore, there is an urgent need to develop a new type of slurry pump that can actively clean hard particles at the feed valve body during pumping and effectively disperse clumps of slurry. Summary of the Invention

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a mud pump, including a pump body, a feed pipe and a discharge pipe, with two cleaning structures detachably connected to the feed pipe. The cleaning structures are located in front of the feed valve body, so that when the material is sucked, the mud first passes through the cleaning structures and then flows through the feed valve body to the inside of the pump body. The cleaning structures are used to clean hard particles at the feed valve body and to shear agglomerated mud.

[0008] The cleaning structure includes a connecting pipe that is detachably connected to the feed pipe. Inside the connecting pipe, a filter screen and a shearing shaft are installed via a support assembly. The filter screen is used to prevent hard particles from flowing into the pump body.

[0009] The cleaning structure also includes a moving component for moving the filter screen to the feed valve body, during which hard particles are pushed out of the feed valve body.

[0010] The cleaning structure also includes a drive assembly for rotating a shear shaft, which disperses the clumped slurry.

[0011] By moving and pushing away hard particles and rotating to disperse agglomerated mud, the pump body can perform stable mud pumping operations.

[0012] Preferably, the connecting pipe has a continuously bent structure and is connected to the feed pipe via a flange.

[0013] Preferably, the support assembly includes a support frame slidably connected inside the connecting tube, the center of the support frame being rotatably connected to the shearing shaft, and the end of the shearing shaft being rotatably connected to the filter screen.

[0014] Preferably, the movable component includes a bracket fixedly installed on the outside of the connecting pipe, a hydraulic cylinder fixedly installed on the bracket, and the telescopic section of the hydraulic cylinder being fixedly connected to the support frame.

[0015] Preferably, the drive assembly includes a synchronous motor fixedly mounted on a bracket, and a hexagonal rod is fixedly mounted on the output shaft of the synchronous motor, the hexagonal rod driving the shear shaft to rotate.

[0016] Preferably, the shearing shaft is axially slidably connected to a connecting cylinder rod, the connecting cylinder rod having a hexagonal groove structure inside, and the connecting cylinder rod is slidably connected to the hexagonal rod.

[0017] Preferably, the end of the connecting rod near the filter screen extends to the outside of the shearing shaft, and a helical spring is provided between the connecting rod and the shearing shaft.

[0018] Preferably, when the filter screen moves to the position furthest from the feed valve body, the hexagonal rod blocks the connecting cylinder rod, causing the connecting cylinder rod to press against the filter screen, so that the connecting cylinder rod and the filter screen rotate synchronously.

[0019] Preferably, a sealing rubber layer is fixedly installed on the outside of the filter screen, the outer diameter of the sealing rubber layer is larger than the inner diameter of the feed pipe, and the outer diameter of the sealing rubber layer is smaller than the inner diameter of the connecting pipe.

[0020] Preferably, a storage tank is fixedly connected to the lower part of the connecting pipe. The storage tank has a small upper diameter and a large lower diameter. When the filter screen rotates, the blockages on it are thrown out and flow into the storage tank.

[0021] The beneficial effects of this invention are as follows: First, this invention uses a connecting pipe connected in series in the feed pipe to guide the slurry. When the feed valve body opens to suck up material, the moving component pushes the filter screen to extend into the feed valve body, so that hard particles in the slurry are effectively blocked by the filter screen. At the same time, the driving component drives the shearing shaft to rotate, shearing and dispersing the passing clumps of slurry, restoring it to a fluid state and preventing clumps from clogging the filter screen. After the liquid is fed, the moving component pushes the filter screen to reset. During this process, the filter screen pushes outward the hard particles remaining at the feed valve body, thereby ensuring that the feed valve body can always be closed normally. This effectively solves the problems of valve body sealing failure and volumetric efficiency reduction, and realizes continuous and stable pumping operation of the slurry pump.

[0022] Second, this invention employs a sealing rubber layer on the outside of the filter screen that elastically adheres to the inner wall of the feed pipe during the liquid feeding process, forming a reliable seal that forces the slurry to flow through the filter screen and ensures the filtration effect. When the filter screen pushes hard particles outward, the sealing rubber layer scrapes the inner wall of the feed pipe at the feed valve body, removing the particles adhering to the pipe wall and ensuring the complete removal of hard particles.

[0023] Third, when the filter screen moves to the storage tank position, the sealing rubber layer separates from the wall of the connecting pipe. Under the drive of the drive component, the filter screen automatically rotates with the shear shaft, using centrifugal force to throw out the particles that are blocking it. The thrown-out particles fall into the storage tank at the bottom of the connecting pipe for collection, realizing the self-cleaning function of the filter screen. The filter screen can be kept unobstructed without stopping the machine, which greatly extends the continuous effective operation time of the pump.

[0024] Fourth, when the filter screen is in the working position inside the feed pipe, the helical spring pushes the connecting cylinder rod to slide away from the filter screen along the shearing shaft axial direction, so that the shearing shaft rotates independently while the filter screen does not rotate with it, thereby ensuring that the filter screen is stably attached to the inner wall of the feed pipe and maintaining a reliable filtration state; when the filter screen is pulled back into the connecting pipe, the end of the connecting cylinder rod abuts against the filter screen, so that the filter screen rotates synchronously with the shearing shaft, and the filter screen is self-cleaned by the centrifugal force of rotation. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the present invention with the cleaning structure removed and the feed pipe directly connected to the pump body; Figure 3 This is a schematic diagram of the structure of the connecting pipe, the feed pipe, the moving component, and the driving component in this invention; Figure 4 This is a partial cross-sectional view of the filter screen, support assembly, storage tank and hexagonal rod in this invention; Figure 5 This is a partial cross-sectional view of the shear shaft, support frame, sealing rubber layer and bracket in this invention; Figure 6 This is a schematic diagram of the structure of the filter screen, sealing rubber layer, support frame and shear shaft in this invention; Figure 7 This is a partial cross-sectional view of the hexagonal rod, connecting cylinder rod, shearing shaft, and filter screen in this invention.

[0027] In the diagram: 1. Pump body; 2. Inlet pipe; 3. Outlet pipe; 4. Cleaning structure; 41. Connecting pipe; 42. Support assembly; 43. Filter screen; 44. Shearing shaft; 45. Moving assembly; 46. Drive assembly; 411. Storage tank; 421. Support frame; 431. Sealing rubber layer; 451. Support; 452. Hydraulic cylinder; 461. Synchronous motor; 462. Hexagonal rod; 463. Connecting cylinder rod. Detailed Implementation

[0028] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the art or in accordance with the product manual.

[0029] See Figure 1 , Figure 2 and Figure 3 A mud pump includes a pump body 1, a feed pipe 2 and a discharge pipe 3. Two cleaning structures 4 are detachably connected to the feed pipe 2. The cleaning structures 4 are located in front of the feed valve body, so that when the material is sucked, the mud first passes through the cleaning structures 4 and then flows through the feed valve body to the inside of the pump body 1. The cleaning structures 4 are used to clean hard particles at the feed valve body and to shear agglomerated mud.

[0030] When pumping mud, the end of the feed pipe 2 extends into the material pool, and the end of the discharge pipe 3 is connected to the equipment that needs mud. The pump body 1 in this invention adopts a hydraulically driven reciprocating double-cylinder positive displacement pump commonly used in traditional equipment. When one cylinder of the pump body 1 is sucking material, the feed valve body at the corresponding position of the cylinder is opened. Then, the cleaning structure 4 extends into the position of the feed valve body at the feed pipe 2 to filter and intercept hard particles, and at the same time shear the clumped mud.

[0031] The slurry in the material pool passes through the feed pipe 2 and the cleaning structure 4 in sequence, and then flows into the enlarged cylinder through the feed pipe 2 again, realizing the liquid intake of the pump body 1. When the cylinder sucks in a specified volume of slurry, the cleaning structure 4 pushes out the hard particles at the feed valve body corresponding to the feed pipe 2, so that the feed valve body effectively and stably closes the feed pipe 2. Then the pump body 1 pushes out the sucked slurry, so that the slurry is discharged along the discharge pipe 3. This process is repeated to carry out stable slurry pumping operation.

[0032] See Figure 1 , Figure 3 and Figure 4 The cleaning structure 4 includes a connecting pipe 41 detachably connected to the feed pipe 2. A filter screen 43 and a shearing shaft 44 are arranged inside the connecting pipe 41 via a bracket assembly 42. The filter screen 43 is used to block hard particles from flowing into the pump body 1. The cleaning structure 4 also includes a moving assembly 45 for moving the filter screen 43 to the feed valve body. When the filter screen 43 moves, it pushes the hard particles out of the feed valve body. The cleaning structure 4 also includes a driving assembly 46 for rotating the shearing shaft 44. The rotating shearing shaft 44 disperses the agglomerated slurry.

[0033] When pumping slurry, the connecting pipe 41 is connected in series with the feed pipe 2. When the pump body 1 is filled with liquid, the slurry passes through the connecting pipe 41 and then through the feed pipe 2 into the pump body 1. When the liquid is filled, the corresponding feed valve is in the open state, and the moving component 45 pushes the filter screen 43 to the position of the corresponding feed valve in the feed pipe 2. The filter screen 43 filters the slurry entering the pump body 1, so that the filter screen 43 intercepts hard particles. While filtering hard particles, the driving component 46 rotates the shear shaft 44 to disperse the clumped slurry and prevent the clumped slurry from clogging the filter screen 43, which would increase the liquid inlet resistance.

[0034] After the pump body 1 completes the liquid intake, the filter screen 43 is pulled back by the moving component 45, so that the filter screen 43 pushes out the hard particles in the feed pipe 2 and the corresponding position of the feed valve body. This prevents the hard particles from getting stuck in the feed valve body when it is closed, which would prevent the feed valve body from closing completely and cause the slurry to flow out along the feed pipe 2 during discharge. When the feed valve body is closed, the filter screen 43 and the shear shaft 44 rotate synchronously, so that the shear shaft 44 continuously agitates the slurry and prevents the slurry from clumping. The rotation of the filter screen 43 throws out the clogging particles on it, ensuring the filtration effect of the filter screen 43.

[0035] To facilitate maintenance of this invention, the following structure is designed: (See attached diagram) Figure 3 and Figure 4 The connecting pipe 41 has a continuous bending structure and is connected to the feed pipe 2 through a flange. When maintenance is required, the connecting pipe 41 is removed from the feed pipe 2 for maintenance.

[0036] To ensure the filtering effect of filter screen 43 on hard particles, the present invention designs the following structure: (See reference) Figure 4 , Figure 5 , Figure 6 and Figure 7 A sealing rubber layer 431 is fixedly installed on the outside of the filter screen 43. The outer diameter of the sealing rubber layer 431 is larger than the inner diameter of the feed pipe 2, and the outer diameter of the sealing rubber layer 431 is smaller than the inner diameter of the connecting pipe 41.

[0037] When liquid is introduced, the filter screen 43 is located inside the feed pipe 2, so that the filter screen 43 drives the sealing rubber layer 431 to abut against and seal against the pipe wall of the feed pipe 2, allowing most of the slurry to pass through the filter screen 43, ensuring the filtration effect of the filter screen 43 on particles; when the filter screen 43 moves into the connecting pipe 41, the filter screen 43 drives the sealing rubber layer 431 to detach from the feed pipe 2, so that when the filter screen 43 rotates, the sealing rubber layer 431 does not contact the pipe wall of the connecting pipe 41, thus allowing smooth rotation and preventing excessive wear of the sealing rubber layer 431.

[0038] To facilitate the collection of particles trapped by filter screen 43 and centrifugally dislodged by filter screen 43, the present invention designs the following structure: (See attached diagram) Figure 3 and Figure 4 The lower part of the connecting pipe 41 is fixedly connected to a storage tank 411. The upper diameter of the storage tank 411 is small and the lower diameter is large. When the filter screen 43 moves into the connecting pipe 41, the side of the filter screen 43 that traps particles moves to the position of the corresponding storage tank 411, so that the particles pushed by the filter screen 43 and the particles thrown out by the rotation of the filter screen 43 are thrown out and flow into the storage tank 411 under the action of gravity.

[0039] To facilitate the movement of the filter 43, the present invention is designed with the following structure: (See attached diagram) Figure 3 , Figure 4 and Figure 5 The support assembly 42 includes a support frame 421 slidably connected inside the connecting pipe 41. The center of the support frame 421 is rotatably connected to the shearing shaft 44, and the end of the shearing shaft 44 is rotatably connected to the filter screen 43. The moving assembly 45 includes a bracket 451 fixedly installed on the outside of the connecting pipe 41. A hydraulic cylinder 452 is fixedly installed on the bracket 451, and the telescopic section of the hydraulic cylinder 452 is fixedly connected to the support frame 421.

[0040] When liquid is introduced, the telescopic section of the extended hydraulic cylinder 452 pushes the support frame 421, thereby causing the support frame 421 to move the filter screen 43 through the shear shaft 44, so that the filter screen 43 is located in the feed pipe 2 when liquid is introduced and in the connecting pipe 41 when liquid is discharged.

[0041] In order to continuously rotate the shear shaft 44 and thus continuously shear the clumps in the mud, the present invention designs the following structure: (See reference) Figure 3 , Figure 4, Figure 5 , Figure 6 and Figure 7 The drive assembly 46 includes a synchronous motor 461 fixedly mounted on a bracket 451. A hexagonal rod 462 is fixedly mounted on the output shaft of the synchronous motor 461. The hexagonal rod 462 drives the shearing shaft 44 to rotate. A connecting cylinder rod 463 is axially slidably connected inside the shearing shaft 44. The connecting cylinder rod 463 has a hexagonal groove structure inside and is slidably connected to the hexagonal rod 462.

[0042] When pumping mud, the synchronous motor 461 is started, which drives the hexagonal rod 462 to rotate continuously. The hexagonal rod 462 drives the connecting cylinder rod 463 to rotate, and the connecting cylinder rod 463 drives the shearing shaft 44 to rotate continuously, so that the shearing shaft 44 continuously shears the clumps in the mud. When the filter screen 43 moves, the support frame 421 drives the shearing shaft 44 and the connecting cylinder rod 463 to move synchronously, so that the connecting cylinder rod 463 slides along the hexagonal rod 462, ensuring that the hexagonal rod 462 rotates the shearing shaft 44 stably.

[0043] To facilitate the automatic rotation and stopping of the filter 43, the present invention designs the following structure: (See attached diagram) Figure 4 , Figure 5 , Figure 6 and Figure 7 One end of the connecting cylinder 463 near the filter screen 43 extends to the outside of the shearing shaft 44, and a helical spring is provided between the connecting cylinder 463 and the shearing shaft 44, so that the connecting cylinder 463 presses against the filter screen 43, and the connecting cylinder 463 and the filter screen 43 rotate synchronously.

[0044] When the filter screen 43 is inside the feed pipe 2, the helical spring pushes the connecting cylinder rod 463 away from the filter screen 43 through its elastic force. At this time, the filter screen 43 is pressed against the inner wall of the feed pipe 2 through the sealing rubber layer 431, so that the shearing shaft 44 rotates independently while the filter screen 43 does not rotate with it, thereby ensuring that the filter screen 43 is stably attached to the inner wall of the feed pipe 2 and maintaining a reliable filtration state. When the filter screen 43 is pulled back into the connecting pipe 41, the filter screen 43 moves to the position furthest from the feed valve body, so that the hexagonal rod 462 blocks the connecting cylinder rod 463, thereby making the end of the connecting cylinder rod 463 press against the filter screen 43, and thus making the filter screen 43 rotate synchronously with the shearing shaft 44, which facilitates the self-cleaning of the filter screen 43 by the centrifugal force of rotation.

[0045] Although this invention adds a connecting pipe 41, a filter screen 43, and a shear shaft 44 to the traditional mud pump, slightly increasing the initial cost, it actively inserts the filter screen 43 into the corresponding feed valve body position inside the feed pipe 2 during pumping to intercept hard particles. The shear shaft 44 continuously rotates and disperses the clumped mud. After the liquid is fed, the filter screen 43 pushes out the hard particles in the feed pipe 2 when it resets. At the same time, the filter screen 43 automatically rotates in the connecting pipe 41 to throw out the blockage particles into the storage tank 411 for self-cleaning. This achieves reliable sealing of the feed valve body and continuous unobstructed flow of the filter screen 43, effectively solving problems such as valve body sealing failure, reduced volumetric efficiency, and frequent shutdowns for cleaning caused by hard particle jamming and clumping. It significantly extends the continuous effective operating time of the pump and the service life of the valve assembly, greatly reduces maintenance frequency and downtime losses, can quickly balance the initial investment, and achieve a significant improvement in overall benefits.

[0046] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0047] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A mud pump, comprising a pump body, an inlet pipe, and an outlet pipe, characterized in that, Two cleaning structures are detachably connected to the feed pipe. The cleaning structures are located at the front of the feed valve body, so that when the material is sucked in, the mud first passes through the cleaning structures and then flows through the feed valve body to the inside of the pump body. The cleaning structures are used to clean hard particles and shear clumps of mud at the feed valve body. The cleaning structure includes a connecting pipe that is detachably connected to the feed pipe. Inside the connecting pipe, a filter screen and a shearing shaft are installed via a support assembly. The filter screen is used to prevent hard particles from flowing into the pump body. The cleaning structure also includes a moving component for moving the filter screen to the feed valve body, during which hard particles are pushed out of the feed valve body; The cleaning structure also includes a drive assembly for rotating a shear shaft, which disperses the agglomerated sludge. By moving and pushing away hard particles and rotating to disperse agglomerated mud, the pump body can perform stable mud pumping operations.

2. A mud pump according to claim 1, characterized in that, The connecting pipe has a continuously bent structure and is connected to the feed pipe through a flange.

3. A mud pump according to claim 1, characterized in that, The support assembly includes a support frame that is slidably connected inside the connecting tube. The center of the support frame is rotatably connected to the shearing shaft, and the end of the shearing shaft is rotatably connected to the filter screen.

4. A mud pump according to claim 3, characterized in that, The movable component includes a bracket fixedly installed on the outside of the connecting pipe, and a hydraulic cylinder is fixedly installed on the bracket. The telescopic section of the hydraulic cylinder is fixedly connected to the support frame.

5. A mud pump according to claim 3, characterized in that, The drive assembly includes a synchronous motor fixedly mounted on a bracket, and a hexagonal rod fixedly mounted on the output shaft of the synchronous motor, which drives the shear shaft to rotate.

6. A mud pump according to claim 5, characterized in that, The shearing shaft is axially slidably connected to a connecting cylinder rod, which has a hexagonal groove structure inside and is slidably connected to the hexagonal rod.

7. A mud pump according to claim 6, characterized in that, The end of the connecting cylinder rod near the filter screen extends to the outside of the shearing shaft, and a helical spring is provided between the connecting cylinder rod and the shearing shaft.

8. A mud pump according to claim 7, characterized in that, When the filter screen moves to the position furthest from the feed valve body, the hexagonal rod blocks the connecting cylinder rod, causing the connecting cylinder rod to press against the filter screen, so that the connecting cylinder rod and the filter screen rotate synchronously.

9. A mud pump according to claim 1, characterized in that, A sealing rubber layer is fixedly installed on the outside of the filter screen. The outer diameter of the sealing rubber layer is larger than the inner diameter of the feed pipe, and the outer diameter of the sealing rubber layer is smaller than the inner diameter of the connecting pipe.

10. A mud pump according to claim 1, characterized in that, The lower part of the connecting pipe is fixedly connected to a storage tank. The upper part of the storage tank has a small diameter and the lower part has a large diameter. When the filter screen rotates, the blockage on it is thrown out and flows into the storage tank.

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