Quick-change tool for mud pump cylinder liner and quick-change method

Abstract

A quick-change tool for a mud pump cylinder liner. The quick-change tool comprises a pressing cover (4) capable of pressing a cylinder liner (5) onto a liner seat (2), wherein one end of the pressing cover (4) acts on the cylinder liner (5), a pressing ring (6) is provided at the other end of the pressing cover (4), at least two threaded rods (3) pass through the pressing ring (6) and the pressing cover (4), one end of each threaded rod (3) is configured to lock the liner seat (2), and the relative position between each threaded rod (3) and the pressing ring (6) can be locked by means of a locking mechanism; a driving device acts on the pressing ring (6), such that the pressing ring (6) can move in a direction away from the pressing cover (4); and a locking nut (8) is connected to each threaded rod (3), and a stop point where each locking nut (8) and the corresponding threaded rod (3) are connected is a position where the locking nut (8) is in contact with the pressing cover (4). Further provided is a quick-change method using the quick-change tool for a mud pump cylinder liner. The quick-change tool for the mud pump cylinder liner and the quick-change method using same can not only rapidly and conveniently change the mud pump cylinder liner, but can also accurately control the pre-tightening force of the nuts on the cylinder liner.

Description

Mud pump cylinder liner quick-change tool and quick-change method

[0001] This application claims priority to Chinese patent application (202311611870.8) filed on November 27, 2023. Technical Field

[0002] The invention relates to the field of cylinder sleeve disassembly tools, in particular to a mud pump cylinder sleeve quick-change tool and a quick-change method. Background Art

[0003] Mud pumps are a vital component of the oil drilling rig's circulation system. Their function is to circulate mud during the drilling process, facilitating the return of bottomhole cuttings to the surface. The pressurized mud also cools the drill bit and provides a continuous source of power for downhole tools. The mud pump liner is a crucial component of the pump. By replacing liners of varying diameters, the pump's displacement and pressure can be adjusted to suit varying drilling conditions. Therefore, liner replacement is an essential step in the drilling process.

[0004] Traditionally, the cylinder liner is bolted to the cylinder through the cylinder gland. Each bolt requires sufficient torque, requiring the use of a force rod or hammering the wrench. This makes it difficult to effectively control the pre-tightening torque, labor-intensive, and prone to personal injury. Due to the small spacing between the mud pump cylinders, the bolts located in the gap between the two cylinders have very limited space for movement, making traditional cylinder liner replacement difficult and inefficient.

[0005] Therefore, there is a need in the art for a tool to achieve the purpose of quickly and conveniently replacing the cylinder liner of a mud pump.

[0006] Summary of the Invention

[0007] The purpose of the present invention is to provide a mud pump cylinder liner quick-change tool and quick-change method to address the above-mentioned problems, which can not only quickly and conveniently replace the cylinder liner of the mud pump, but also accurately control the pre-tightening force of the nut on the cylinder liner.

[0008] The technical solution adopted by the present invention is as follows: a mud pump cylinder liner quick-change tool, including a pressure cover that can press the cylinder liner onto the sleeve seat, one end of the pressure cover acts on the cylinder liner, and the other end of the pressure cover is arranged with a pressure ring, there are at least two screws passing through the pressure ring and the pressure cover, one end of the screw is used to lock the sleeve seat, and the screw can lock the relative position with the pressure ring through a locking mechanism; there is a driving device acting on the pressure ring, so that the pressure ring can move in a direction away from the pressure cover; a locking nut is connected to the screw, and the stop point of the connection between the locking nut and the screw is the contact position between the locking nut and the pressure cover.

[0009] Furthermore, a plurality of screws are arranged in a circumferential array with the axis of the gland / ring as the center.

[0010] Furthermore, the locking mechanism is a locking nut, which is connected to the screw to lock the position of the pressure ring relative to the screw; or the locking mechanism is a locking thread arranged on the pressure ring, which is connected to the screw through the locking thread to lock the position of the pressure ring relative to the screw.

[0011] Furthermore, the locking nut has an internal thread and an external thread, the locking nut is connected to the locking nut via the external thread; and the locking nut is connected to the screw rod via the internal thread.

[0012] Furthermore, one end of the gland is connected to the support block, the screw rod can pass through the support block, and the stop point where the locking nut is connected to the screw rod is the end face of the support block.

[0013] Furthermore, a restraining groove is provided on the support block, and the pressure ring is installed in the restraining groove; there is a movable gap between the bottom of the restraining groove and the end face of the pressure ring for the pressure ring to move away from the pressure cover.

[0014] Furthermore, the driving device is a plurality of piston hydraulic cylinders, and the plurality of piston hydraulic cylinders are assembled between the pressure cover and the pressure ring.

[0015] Furthermore, a plurality of piston hydraulic cylinders are evenly distributed around all the screws; or a plurality of piston hydraulic cylinders are arranged in a circumferential array with the axis of the gland / ring as the center.

[0016] Furthermore, the piston hydraulic cylinder comprises a cylinder body and a piston, the piston and the cylinder body are connected in a sliding and sealing manner, and all cylinder bodies are connected through a liquid oil flow channel.

[0017] A method for quickly replacing a mud pump cylinder liner, wherein the cylinder liner and the liner seat are fastened together by bolts, wherein the bolts have a screw and a fastening nut; the method comprises the following steps:

[0018] S1: Installing the cylinder liner; including steps S11 to S15;

[0019] S11: Bolt the cylinder liner and the seat together;

[0020] S12: Use the driving device to indirectly or directly stretch the screw, so that the screw undergoes elastic deformation along the axial direction and has elastic potential energy; move the closing nut away from the cylinder sleeve following the elastic deformation of the screw;

[0021] S13: Twist the closing nut and bring it closer to the cylinder liner until the cylinder liner and the seat are bolted together again;

[0022] S14: Remove the driving device, release the elastic potential energy of the screw, and the screw pulls the nut. The elastic potential energy acts on the nut and is converted into the pre-tightening force of the bolt to lock the cylinder sleeve and the sleeve seat; the installation of the cylinder sleeve is completed;

[0023] S15: If it is necessary to determine the pre-tightening force f1 between the cylinder liner and the cylinder base after the cylinder liner is installed, then in steps S11 and S13, the pre-tightening force f0 between the cylinder liner and the cylinder base after the bolts are tightened is equal to 0, and the force of the driving device stretching the screw to generate elastic deformation is f1;

[0024] S2: disassembling the cylinder liner; including steps S21 to S23;

[0025] S21: Use the driving device to indirectly or directly stretch the screw to overcome the preload force f1 between the cylinder sleeve and the cylinder seat;

[0026] S22: Twist the handle nut away from the cylinder sleeve;

[0027] S23: Remove the drive unit and continue to tighten the handle nut to complete the disassembly of the cylinder liner.

[0028] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0029] 1. The solution disclosed in the present invention utilizes a driving device to stretch the screw during the entire disassembly and assembly process, eliminating the need for hammers, force rods, etc., thus avoiding high-intensity physical labor, shortening the disassembly process, and effectively ensuring operational safety.

[0030] 2. The solution disclosed in the present invention can control the force applied to the screw by the driving device to accurately control the pre-tightening force, thereby achieving the premise of having sufficient pre-tightening force and reducing thread damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention will now be described by way of example with reference to the accompanying drawings, in which:

[0032] FIG1 is a schematic diagram of the oblique two-side structure of the quick-change tool disclosed in the present invention after installation;

[0033] FIG2 is a schematic side view of the quick-change tool disclosed in the present invention after installation;

[0034] FIG3 is a schematic cross-sectional view of the structure along the AA direction in FIG2 ;

[0035] FIG4 is a schematic cross-sectional view of the gland disclosed in the present invention;

[0036] Markings in the figure: 1-mud pump; 2-sleeve; 3-screw; 4-pressure cover; 41-quick connect joint; 42-through hole; 43-oil flow channel; 44-cylinder body; 5-cylinder liner; 6-pressure ring; 7-locking nut; 8-locking nut; 9-support block. DETAILED DESCRIPTION

[0037] All features disclosed in this specification, or all steps in the disclosed methods or processes, except mutually exclusive features and / or steps, can be combined in any manner.

[0038] Any feature disclosed in this specification, unless otherwise stated, may be replaced by other equivalent or similar features. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0039] Example 1

[0040] As shown in Figures 1 to 4, a quick-change tool for a mud pump cylinder liner includes a pressure cap 4 that can press the cylinder liner 5 onto the sleeve 2. One end of the pressure cap 4 acts on the cylinder liner 5, and a pressure ring 6 is arranged on the other end of the pressure cap 4. The pressure cap 4 and the pressure ring 6 are both provided with position-matched through holes 42. There are at least two screws 3 that pass through the pressure ring 6 and the pressure cap 4 through the through holes 42 at corresponding positions. In this embodiment, the number of screws 3 is four. The screw 3 has threads, and one end of the screw 3 is used to lock the sleeve 2. Specifically, the screw 3 is fixed to the mud pump 1 through a threaded connection, and the sleeve 2 passes through the screw 3, and then the sleeve 2 is locked to the mud pump 1 through a nut; the screw 3 can be locked relative to the pressure ring 6 through a locking mechanism; there is a driving device acting on the pressure ring 6, so that the pressure ring 6 can move in a direction away from the pressure cap 4. Because the relative position of the pressure ring 6 and the screw 3 is locked, the driving device moves with the pressure ring 6, which is actually the driving device applying force to the screw Rod 3, so that the screw 3 is stretched and elastically deformed, thereby having elastic potential energy; a locking nut 8 is connected to the screw 3, and the stop point of the connection between the locking nut 8 and the screw 3 is the contact position between the locking nut 8 and the pressure cover 4. After the driving device is removed, the elastic deformation of the screw 3 cannot be restored because the locking nut 8 is limited by the pressure cover 4, so that the elastic potential energy of the screw 3 acts on the locking nut 8 to form a pre-tightening force, which is further transmitted to the pressure cover 4. The pressure cover 4 acts on the cylinder liner 5, so that the cylinder liner 5 and the sleeve seat 2 are stably connected.

[0041] In this embodiment, the cylinder sleeve 5 is quickly and conveniently installed due to the provision of a driving device in this solution, as follows:

[0042] When installing the cylinder liner 5, the locking mechanism locks the pressure ring 6, the pressure ring 6 acts on the pressure cover 4, and the pressure cover 4 acts on the cylinder liner 5, thereby achieving the preliminary locking of the cylinder liner 5 to the sleeve seat 2; before the driving device applies force, the locking nut 8 is at the dead point and there is preferably no pressing force (pre-tightening force) between the locking nut 8 and the pressure cover 4, which is convenient for the subsequent determination of the pre-tightening force between the cylinder liner 5 and the sleeve seat 2; of course, if there is no need to consider the size of the pre-tightening force between the cylinder liner 5 and the sleeve seat 2, the locking nut 8 can be at the dead point before the driving device applies force; the driving device applies force to the pressure ring 6, and moves the pressure ring 6 away from the pressure cover 4, and the pressure ring 6 and the screw 3 are locked by the locking mechanism The relative position is fixed, so the movement of the pressure ring 6 is actually the elastic deformation of the screw 3, and the screw 3 has elastic potential energy; the deformation of the screw 3 causes the locking nut 8 to follow the deformation and move away from the gland 4, that is, the locking nut 8 is no longer in contact with the gland 4; then, the locking nut 8 is turned to make it contact with the gland 4 again (the locking nut 8 moves to a new stop point); the force applied by the driving device is removed, and the screw 3 cannot restore the deformation under the condition that the locking nut 8 is restricted by the gland 4, so that the elastic potential energy of the screw 3 acts on the locking nut 8, which is converted into a force that presses the locking nut 8 on the gland 4, and further converted into a preload force between the cylinder liner 5 and the sleeve seat 2.

[0043] When disassembling the cylinder liner 5, the driving device applies force to the pressure ring 6, and the force is transmitted to the screw 3 through the pressure ring 6 to overcome the preload force f1 (the elastic potential energy mentioned above) between the cylinder liner 5 and the sleeve seat 2, so that there is no pressing force between the locking nut 8 and the pressure cover 4, and further the locking nut 8 is easy to screw, thereby achieving the purpose of easy disassembly.

[0044] In this embodiment, it can be seen from the above description that the disclosed solution utilizes a driving device throughout the entire disassembly and assembly process, so that the entire disassembly and assembly process does not require the use of a hammer, a force rod, etc., thereby avoiding high-intensity physical labor, shortening the disassembly process, and effectively ensuring operational safety; the driving device can be used to control the force applied to the screw 3 to accurately control the preload force, thereby achieving a sufficient preload force and reducing thread damage.

[0045] In this embodiment, the force from the driving device is transmitted to each screw 3 through the pressure ring 6, thereby improving the overall pace coordination; avoiding the problem that the force exerted on one or more screws 3 is inconsistent with the force exerted on other screws 3, and effectively preventing the occurrence of torque due to the different elastic potential energy generated by the corresponding screws 3.

[0046] Example 2

[0047] Based on Example 1, a specific implementation method that can be implemented is further proposed.

[0048] A feasible implementation method is to arrange four screws 3 in a circumferential array with the axis of the gland 4 / pressure ring 6 as the center, so that the elastic potential energy of the screws 3 can be evenly distributed around the gland 4, so that the pre-tightening force formed can be along the axis of the gland 4 and the cylinder liner 5, avoiding eccentric force and preventing torque from being generated on the cylinder liner 5.

[0049] It should be noted that the axis of the gland 4 , the axis of the pressure ring 6 , and the axis of the cylinder liner 5 are all collinear.

[0050] A feasible implementation method is proposed in this implementation method regarding the "locking mechanism", which is detailed as follows.

[0051] In the first embodiment, the locking mechanism is a locking nut 7 , which is connected to the screw 3 and pushes the pressing ring 6 to fit against the pressure cover 4 , thereby locking the position of the pressing ring 6 relative to the screw 3 .

[0052] In the second embodiment, the locking mechanism is a locking thread provided on the pressure ring 6 , and the locking thread is provided on the hole wall of the through hole 42 on the pressure ring 6 . The pressure ring 6 is connected to the screw rod 3 through the locking thread to lock the position of the pressure ring 6 relative to the screw rod 3 .

[0053] The relative positions of the pressure ring 6 and the screw rod 3 are locked by the locking mechanism, so that when the pressure ring 6 is subjected to the force given by the driving device, the force can be transmitted to the screw rod 3 so that the screw rod 3 generates elastic deformation.

[0054] In a feasible implementation manner, the locking nut 7 has an internal thread and an external thread, and the locking nut 8 is connected to the locking nut 7 via the external thread to achieve the connection between the locking nut 8 and the screw rod 3; the locking nut 7 is connected to the screw rod 3 via the internal thread.

[0055] Example 3

[0056] Based on any one of the implementations in Examples 1-2, a feasible implementation is further proposed.

[0057] A feasible implementation method is that one end of the pressure cover 4 is connected to the support block 9, the screw 3 can pass through the support block 9, the stop point of the connection between the locking nut 8 and the screw 3 is the end face of the support block 9, and the distance between the locking nut 8 and the pressure cover 4 is filled by the support block 9.

[0058] In this embodiment, the support block 9 and the pressure cover 4 are connected by screws.

[0059] A feasible implementation method is that a constraint groove is provided on the support block 9, and the pressure ring 6 is installed in the constraint groove; the pressure ring 6 is constrained by the constraint groove, on the one hand, the axis of the pressure ring 6 is kept collinear with the axis of the pressure cover 4, and on the other hand, the movement distance of the pressure ring 6 is limited to prevent the pressure ring 6 from moving excessively with the screw 3 and causing plastic deformation of the screw 3.

[0060] Furthermore, in order to enable the pressure ring 6 to move smoothly, a movable gap exists between the bottom of the constraint groove and the end face of the pressure ring 6 for the pressure ring 6 to move away from the pressure cover 4, and the pressure ring 6 moves in the movable gap.

[0061] Example 4

[0062] On the basis of any one of the implementations in Examples 1-3, a feasible implementation of the "driving device" is further proposed.

[0063] The driving device is a piston hydraulic cylinder, and can also be a linear driving device such as a linear motor; a piston hydraulic cylinder is preferred because the hydraulic drive can generate enough force to cause the pressure ring 6 to deform with the screw 3.

[0064] A feasible implementation method is that the driving device is a plurality of piston hydraulic cylinders, which are assembled between the pressure cover 4 and the pressure ring 6, and force is applied by the piston hydraulic cylinders; the piston hydraulic cylinders are arranged between the pressure cover 4 and the pressure ring 6 so that both the action force and the reaction force exist between the pressure cover 4 and the pressure ring 6, ensuring that the movement of the pressure ring 6 away from the pressure cover 4 is stable.

[0065] There are eight piston hydraulic cylinders, and two piston hydraulic cylinders are assembled near each screw 3, which increases the total area of ​​the piston and improves operation safety.

[0066] A feasible implementation method is that several piston hydraulic cylinders are evenly distributed around all screw rods 3; or several piston hydraulic cylinders are arranged in a circumferential array with the axis of the pressure cover 4 / pressure ring 6 as the center; so that the driving force provided by all piston hydraulic cylinders is evenly distributed in all screw rods 3, so that the deformation of all screw rods 3 is uniform and the same, thereby improving stability.

[0067] A feasible implementation method is that the piston hydraulic cylinder has a cylinder body 44 and a piston, the piston and the cylinder body 44 are slidingly and sealedly connected, and all cylinder bodies 44 are connected through the oil flow channel 43, so that all piston hydraulic cylinders are subjected to the same hydraulic pressure, further ensuring that the deformation of the screw 3 is uniform and the same.

[0068] It should be noted that the piston hydraulic cylinder is an independent structure, and the cylinder body 44 can also be directly opened on the gland 4; the oil flow channel 43 can be a hydraulic oil pipe, or it can be a flow channel directly opened in the gland 4.

[0069] Furthermore, the oil flow channel 43 is connected to a quick connector 41 , and the quick connector 41 is preferably assembled on the gland 4 .

[0070] Example 5

[0071] A method for quickly replacing a mud pump cylinder liner, wherein a cylinder liner 5 and a sleeve seat 2 are fastened together by bolts, wherein the bolts have a screw 3 and a fastening nut; and the method for quickly replacing a mud pump cylinder liner disclosed in any one of the embodiments 1-4 is applied, comprising the following steps:

[0072] S1: Install the cylinder liner 5; including steps S11 to S15;

[0073] S11: Fit the cylinder liner 5 and the sleeve 2 together with bolts; specifically, the screw 3 is threadedly connected to the casing of the mud pump 1 to fix one end of the screw 3; the sleeve 2 is passed through the screw 3, and then the nut is installed to lock the sleeve 2 in the installation position of the mud pump 1; the cylinder liner 5 is installed in the sleeve 2, the axis of the cylinder liner 5 is collinear with the axis of the sleeve 2, and the cylinder liner 5 has an annular step; the pressure cover 4 and the pressure ring 6 are installed on the screw 3 in sequence, one end face of the pressure cover 4 is abutted against the annular step on the cylinder liner 5, and the pressure ring 6 is abutted against the other end face of the pressure cover 4 through the connection with the screw 3 by the locking nut 7, and the locking nut 7 locks the position of the pressure ring 6 relative to the screw 3; install the locking nut 8 so that the locking nut 8 acts on the other end face of the pressure cover 4; in Example 3, the locking nut 8 is in contact with the end face of the support block 9.

[0074] S12: Use the driving device to indirectly or directly stretch the screw 3, and the screw 3 undergoes elastic deformation along the axial direction, and the screw 3 has elastic potential energy; the closing nut follows the elastic deformation of the screw 3 away from the cylinder sleeve 5; wherein, the driving device is a piston hydraulic cylinder, the piston hydraulic cylinder pushes the pressure ring 6, and the pressure ring 6 moves with the screw 3, and the screw 3 produces elastic deformation; the closing nut is a locking nut 8, and the locking nut 8 follows the deformation of the screw 3 and moves in the direction away from the pressure cover 4.

[0075] S13: Twist the locking nut (i.e., the locking nut 8) and bring the locking nut close to the cylinder liner 5 until the cylinder liner 5 and the sleeve seat 2 are bolted together again, i.e., the locking nut 8 is in contact with the end surface of the support block 9 again.

[0076] S14: Remove the force of the driving device (i.e., the piston hydraulic cylinder), release the elastic potential energy of the screw 3, and the screw 3 pulls the closing nut (i.e., the locking nut 8). The elastic potential energy acts on the closing nut and is converted into the pre-tightening force of the bolt to lock the cylinder sleeve 5 and the sleeve seat 2; the installation of the cylinder sleeve 5 is completed.

[0077] S15: If it is necessary to determine the pre-tightening force f1 between the cylinder liner 5 and the cylinder seat after the cylinder liner 5 is installed, then in steps S11 and S13, the pre-tightening force f0 between the cylinder liner 5 and the cylinder seat after the bolts are tightened is 0, that is, there is no pressing force between the locking nut 8 and the support block 9, and the force of the driving device stretching the screw 3 to produce elastic deformation is f1.

[0078] S2: disassembling the cylinder liner 5; including steps S21 to S23;

[0079] S21: Use the driving device to indirectly or directly stretch the screw 3 to overcome the preload force f1 between the cylinder sleeve 5 and the cylinder seat; wherein the driving device is a piston hydraulic cylinder, the piston hydraulic cylinder pushes the pressure ring 6, and after the pressure ring 6 receives the force from the piston hydraulic cylinder, it overcomes the preload force f1 between the cylinder sleeve 5 and the cylinder seat, that is, overcomes the clamping force between the locking nut 8 and the support block 9.

[0080] S22: Twist the closing nut away from the cylinder sleeve 5, that is, the locking nut 8 away from the support block 9, so that after the screw 3 recovers its deformation, the locking nut 8 just touches or does not touch the end surface of the support block 9.

[0081] S23: Remove the force of the driving device, continue to screw the handle nut and the locking nut to complete the disassembly of the cylinder liner 5; that is, remove the hydraulic pressure of the piston hydraulic cylinder, the screw 3 recovers its deformation, and since the locking nut 8 and the support block 9 are just in contact or not in contact, there is no clamping force between the locking nut 8 and the support block 9, so the locking nut 8 (handle nut) is easy to screw, making the disassembly of the cylinder liner 5 convenient.

[0082] The present invention is not limited to the aforementioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A mud pump cylinder liner quick change tool, characterized in that: The invention comprises a pressure cover (4) capable of pressing a cylinder sleeve (5) onto a sleeve seat (2); one end of the pressure cover (4) acts on the cylinder sleeve (5); a pressure ring (6) is arranged on the other end of the pressure cover (4); at least two screw rods (3) pass through the pressure ring (6) and the pressure cover (4); one end of the screw rod (3) is used to lock the sleeve seat (2); the screw rod (3) can be locked relative to the pressure ring (6) through a locking mechanism; a driving device acts on the pressure ring (6) so that the pressure ring (6) can move in a direction away from the pressure cover (4); a locking nut (8) is connected to the screw rod (3); the stop point of the connection between the locking nut (8) and the screw rod (3) is the contact position between the locking nut (8) and the pressure cover (4).

2. The mud pump cylinder liner quick-change tool according to claim 1, characterized in that: A plurality of screw rods (3) are arranged in a circumferential array with the axis of the pressure cover (4) / pressure ring (6) as the center.

3. The mud pump cylinder liner quick-change tool according to claim 1, characterized in that: The locking mechanism is a locking nut (7), which is connected to the screw rod (3) to lock the position of the pressure ring (6) relative to the screw rod (3); or the locking mechanism is a locking thread provided on the pressure ring (6), which is connected to the screw rod (3) via the locking thread to lock the position of the pressure ring (6) relative to the screw rod (3).

4. The mud pump cylinder liner quick-change tool according to claim 3, characterized in that: The locking nut (7) has an internal thread and an external thread, and the locking nut (8) is connected to the locking nut (7) via the external thread; the locking nut (7) is connected to the screw rod (3) via the internal thread.

5. The mud pump cylinder liner quick-change tool according to any one of claims 1 to 4, characterized in that: One end of the gland (4) is connected to a support block (9), the screw rod (3) can pass through the support block (9), and the stop point where the locking nut (8) is connected to the screw rod (3) is the end surface of the support block (9).

6. The mud pump cylinder liner quick-change tool according to claim 5, characterized in that: The support block (9) is provided with a restraining groove, in which the pressure ring (6) is installed; a movable gap exists between the bottom of the restraining groove and the end surface of the pressure ring (6) for the pressure ring (6) to move away from the pressure cover (4).

7. The mud pump cylinder liner quick-change tool according to claim 1, characterized in that: The driving device is a plurality of piston hydraulic cylinders, and the plurality of piston hydraulic cylinders are assembled between the pressure cover (4) and the pressure ring (6).

8. The mud pump cylinder liner quick-change tool according to claim 7, characterized in that: A plurality of piston hydraulic cylinders are evenly distributed around all the screw rods (3); or a plurality of piston hydraulic cylinders are arranged in a circumferential array with the axis of the pressure cover (4) / pressure ring (6) as the center.

9. The mud pump cylinder liner quick-change tool according to claim 7, characterized in that: The piston hydraulic cylinder comprises a cylinder body (44) and a piston, the piston and the cylinder body (44) are connected in a sliding and sealing manner, and all cylinder bodies (44) are connected through a liquid oil flow channel (43).

10. A method for quickly replacing a cylinder sleeve of a mud pump, wherein the cylinder sleeve (5) and the sleeve seat (2) are connected by bolts, and the bolts have a screw rod (3) and a connection nut; the characteristics are: The following steps are involved: S1: installing the cylinder liner (5); comprising steps S11 to S15; S11: The cylinder sleeve (5) and the sleeve seat (2) are assembled together by bolts; S12: indirectly or directly stretching the screw rod (3) by using a driving device, so that the screw rod (3) undergoes elastic deformation along the axial direction, and the screw rod (3) has elastic potential energy; and moving the closing nut away from the cylinder sleeve (5) following the elastic deformation of the screw rod (3); S13: Tighten the closing nut and bring it closer to the cylinder sleeve (5) until the cylinder sleeve (5) and the sleeve seat (2) are closed by the bolts again; S14: the driving device is removed, the elastic potential energy of the screw rod (3) is released, the screw rod (3) pulls the closing nut, the elastic potential energy acts on the closing nut, and the elastic potential energy is converted into a pre-tightening force of the bolt to lock the cylinder sleeve (5) and the sleeve seat (2); the installation of the cylinder sleeve (5) is completed; S15: if it is necessary to determine the pre-tightening force f1 between the cylinder sleeve (5) and the cylinder seat after the cylinder sleeve (5) is installed, then in step S11 and step S13, the pre-tightening force f0 between the cylinder sleeve (5) and the cylinder seat after the bolts are closed is equal to 0, and the force of the elastic deformation generated by the stretching screw (3) of the driving device is f1; S2: disassembling the cylinder liner (5); comprising steps S21 to S23; S21: Using a driving device to indirectly or directly stretch the screw rod (3) to overcome the preload force f1 between the cylinder sleeve (5) and the cylinder seat; S22: Twist the handle nut to move the handle nut away from the cylinder sleeve (5); S23: Remove the driving device and continue to tighten the handle nut to complete the disassembly of the cylinder sleeve (5).

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