A kind of mine water injection pump cylinder liner hole laser cladding coating wear resistance detection device

Abstract

This invention discloses a wear-resistant testing device for laser cladding coating on the inner bore of a mine water injection pump cylinder liner, relating to the technical field of cylinder liner inner bore testing. It includes a slugging bed, a cooling and slurry conveying mechanism, and a reciprocating testing mechanism. A test chamber is mounted on the slugging bed's worktable, containing a limiting component. The cooling and slurry conveying mechanism is located on the side of the test chamber and is used to convey coal gangue slurry into the test chamber, cooling the cylinder liner during testing. The reciprocating testing mechanism is located on the ram of the slugging bed and tests the cylinder liner using a nitrile rubber piston mounted on it. It also allows for the disassembly and replacement of the nitrile rubber piston during testing, while simultaneously agitating the coal gangue slurry. This invention shortens the disassembly and assembly time of the nitrile rubber piston on the device, improving testing efficiency. Furthermore, the spiral grooves of the stirring impeller and drive rod further enhance the uniformity of slurry distribution, achieving coordinated linkage between the piston reciprocating motion and slurry agitation, effectively improving the accuracy of wear-resistant testing results.

Description

Technical Field

[0001] This invention relates to the technical field of cylinder liner inner bore inspection, specifically to a wear-resistant inspection device for laser cladding coating on the inner bore of a mining water injection pump cylinder liner. Background Technology

[0002] Mining water injection pumps are critical equipment in the mining process. Their cylinder liners, as core components, directly bear the friction generated by the reciprocating motion of the piston and also come into contact with mud media containing impurities such as coal gangue. The working environment is extremely harsh, making them prone to wear and failure, which in turn affects the pump's efficiency and service life. To improve the wear resistance of the cylinder liner's inner bore, laser cladding technology is widely used for surface modification treatment. By forming a high-performance cladding coating on the inner bore, its wear and corrosion resistance are enhanced. Therefore, testing the wear resistance of the laser cladding coating is a crucial step in ensuring the quality of mining water injection pump cylinder liners.

[0003] Existing wear resistance testing devices for laser cladding coatings on the inner bore of mine water injection pump cylinder liners are mostly designed based on simulating actual working conditions. A nitrile rubber piston, with a diameter slightly larger than the cylinder liner's inner diameter, reciprocates within the cylinder liner filled with coal gangue slurry. The water and fine particles in the slurry form a complex lubricating film, while the hard coal gangue particles act as abrasives, scraping or embedding into the coating surface under the piston's pressure, resulting in microscopic cutting and plastic deformation, thus enabling the testing of the coating's wear resistance. However, existing testing devices have several shortcomings in practical applications: Firstly, each testing operation requires disassembling the old nitrile rubber piston left over from the previous test and installing a new nitrile rubber piston. The disassembly and assembly process is often quite cumbersome, requiring the use of various tools, and the operation steps are complex and time-consuming.

[0004] Second, existing devices typically only have a stirring structure inside the mud-containing tank to prevent mud sedimentation. However, after the mud enters the cylinder liner area inside the test chamber, the reciprocating motion of the piston can easily cause localized sedimentation and uneven distribution of the mud. This leads to inconsistent concentrations of the friction medium between the piston and the cylinder liner coating, making it impossible to realistically simulate the frictional environment of uniformly distributed coal gangue impurities under actual working conditions, thus affecting the accuracy of wear resistance test results. Summary of the Invention

[0005] The purpose of this invention is to provide a wear resistance testing device for laser cladding coating on the inner bore of a mine water injection pump cylinder liner, so as to overcome the above-mentioned defects in the prior art.

[0006] A wear resistance testing device for laser cladding coating on the inner bore of a mine water injection pump cylinder liner includes a slugging bed, a cooling slurry conveying mechanism, and a reciprocating test mechanism. The slugging bed has a test chamber on its worktable, and the test chamber has a limiting component for fixing the cylinder liner. The cooling and conveying mechanism is located on the side of the test chamber and is used to convey coal gangue slurry into the test chamber and to cool the cylinder liner during the test. The reciprocating test mechanism is located on the slide of the ram of the sluice box and tests the cylinder liner through the nitrile rubber piston on it. It is also used to disassemble and replace the nitrile rubber piston during the test, and to stir the coal gangue slurry during the test.

[0007] Preferably, the limiting component includes a fixed cylinder and a tightening screw. The fixed cylinder is disposed in the test chamber. A limiting ring for blocking the cylinder sleeve is provided on the inner wall of the fixed cylinder. Several tightening screws for pressing the fixed cylinder against the bushing are threaded along the outer circumference of the fixed cylinder. Several feed holes are evenly distributed on the side of the lower end of the fixed cylinder.

[0008] Preferably, the cooling slurry conveying mechanism includes a slurry tank, a slurry pump, a stirring motor, a coolant tank, and a coolant pump. The slurry pump is located in the slurry tank and its output port is connected to the side of the test chamber through a slurry conveying pipe. The stirring motor is located at the top of the slurry tank and a stirring rod is connected to its output shaft. The coolant pump is located in the coolant tank and its output port is connected to a liquid conveying pipe that extends to a liquid-gathering ring at the top of the fixed cylinder. The liquid-gathering ring is provided with a discharge pipe connected to a drain pump.

[0009] Preferably, the reciprocating test mechanism further includes a lifting rod, a stirring impeller, a drive rod, and disassembly blocks. The lifting rod is mounted on the slide of the test bed. The lower end of the lifting rod is connected to a retaining ring via a fixing ring. The diameter of the retaining ring is larger than the diameter of the fixing ring but smaller than the diameter of the lifting rod. The nitrile rubber piston is sleeved on the fixing ring. Borrowing grooves are evenly distributed along the circumference of the lifting rod, the fixing ring, and the retaining ring. The stirring impeller is rotatably connected to the test chamber and located in the fixed cylinder. The drive rod is connected to the stirring impeller and has a spiral groove. A threaded rod inserted into the spiral groove is threadedly connected to the side of the lifting rod. The drive rod is inserted into the lifting rod and has a fixed post at its upper end. Disassembly blocks that slide and engage with the borrowing grooves are evenly distributed along the circumference of the fixed post. The disassembly blocks have a trapezoidal structure.

[0010] Preferably, the fixed cylinder is provided with several connecting lugs, and each connecting lug is fixed to the test chamber by a connecting bolt.

[0011] Preferably, a valve is installed on the slurry delivery pipe.

[0012] Preferably, the lifting rod is inserted into a fixed seat on the front side of the slide of the ram, and the fixed seat is fixed to the lifting rod by a number of fastening bolts.

[0013] Preferably, the lifting rod has an observation hole above the threaded insertion rod.

[0014] The beneficial effects achieved by this invention are as follows: 1. This application utilizes a method that evenly distributes borrowing grooves on the lifting rod, fixed ring, and retaining ring, and sets a trapezoidal disassembly block at the upper end of the drive rod that slides into the borrowing groove. During installation, it is only necessary to adjust the disassembly block to align with the borrowing groove, and use the slide block of the slotting machine to drive the lifting rod downward. The retaining ring squeezes the nitrile rubber piston, and under the guidance of the inclined surface of the trapezoidal disassembly block, the nitrile rubber piston can be quickly fitted onto the fixed ring. During disassembly, the lifting rod is driven upward in the opposite direction, and the nitrile rubber piston can be opened and detached from the fixed ring by the inclined surface at the lower end of the disassembly block, achieving rapid removal. This structure significantly shortens the disassembly and assembly time and improves the testing efficiency.

[0015] 2. This invention application provides a spiral groove on the drive rod and a threaded insert rod inserted into the spiral groove on the side of the lifting rod. This allows the reciprocating linear motion of the lifting rod to be converted into the reciprocating rotational motion of the drive rod through the engagement of the threaded insert rod and the spiral groove, thereby driving the agitator impeller to rotate. On one hand, the agitator impeller continuously agitates the coal gangue slurry entering the bottom of the fixed cylinder, preventing slurry sedimentation. On the other hand, during the reciprocating rotation of the drive rod, the spiral groove also disturbs the slurry within the cylinder liner, further improving the uniformity of slurry distribution. This achieves synergistic linkage between the reciprocating motion of the nitrile rubber piston and the slurry agitation, effectively improving the accuracy of wear resistance test results. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 This is a top view of the entire invention.

[0018] Figure 3 This is a side view of the limiting component and reciprocating test mechanism of the present invention.

[0019] Figure 4 This is a schematic diagram of the bottom structure of the limiting component and reciprocating test mechanism of the present invention.

[0020] Figure 5 This is a schematic diagram of the top structure of the limiting component and reciprocating test mechanism of the present invention.

[0021] Figure 6 This is a schematic diagram of the lifting rod, stirring impeller and drive rod of the present invention.

[0022] Figure 7 This is a schematic diagram of the lifting rod, fixing ring, and retaining ring of the present invention.

[0023] Figure 8 This is a front view of the lifting rod, fixing ring, and retaining ring of the present invention.

[0024] Figure 9This is a schematic diagram of the structure of the stirring impeller, drive rod, fixed column and disassembly block of the present invention.

[0025] In the diagram, 1. Insertion bed; 11. Fixed seat; 12. Fastening bolt; 2. Test chamber; 3. Limiting assembly; 31. Fixed cylinder; 311. Connecting lug; 32. Feed hole; 33. Limiting ring; 34. Tightening screw; 4. Cooling and conveying mechanism; 41. Slurry tank; 42. Slurry pump; 43. Slurry conveying pipe; 431. Valve; 44. Stirring motor; 45. Stirring rod; 46. Coolant pump; 47. Coolant tank; 48. Conveying pipe; 49. Liquid collection ring; 491. Discharge pipe; 5. Reciprocating test mechanism; 51. Nitrile rubber piston; 52. Lifting rod; 521. Observation hole; 53. Fixed ring; 54. Retaining ring; 55. Alternating groove; 56. Stirring impeller; 57. Drive rod; 571. Spiral groove; 58. Threaded insert rod; 59. Fixed column; 591. Disassembly block. Detailed Implementation To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0027] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] like Figure 1-9 As shown, the present invention provides a wear resistance testing device for laser cladding coating of inner bore of cylinder liner of mine water injection pump, including a sluice bed 1, a cooling slurry conveying mechanism 4 and a reciprocating test mechanism 5, wherein a test chamber 2 is provided on the worktable of the sluice bed 1; In addition, the test chamber 2 is provided with a limiting component 3 for fixing the cylinder liner. The limiting component 3 includes a fixing cylinder 31 and a tightening screw 34. The fixing cylinder 31 is located in the test chamber 2. Several connecting ears 311 are evenly distributed on the fixing cylinder 31. Each connecting ear 311 is fixed to the test chamber 2 by a connecting bolt, which enhances the rigidity and stability of the fixing cylinder 31 and prevents it from loosening during the test. In addition, the inner wall of the fixed cylinder 31 is provided with a limiting ring 33 for blocking the cylinder sleeve. Several tightening screws 34 are threaded along the outer circumference of the fixed cylinder 31 to abut the fixed cylinder 31 and the bushing, which can quickly clamp and disassemble the cylinder sleeve and enhance the convenience of operation. Several feed holes 32 are evenly distributed on the side of the lower end of the fixed cylinder 31. The feed holes 32 allow the mud to enter the inner hole of the cylinder sleeve evenly, avoid local wear, and ensure the comprehensiveness and consistency of the test.

[0029] In addition, the cooling slurry conveying mechanism 4 is located on the side of the test chamber 2 and is used to convey coal gangue slurry into the test chamber 2 and to cool the cylinder liner during the test. The cooling slurry conveying mechanism 4 includes a slurry tank 41, a slurry pump 42, a stirring motor 44, a coolant tank 47, and a coolant pump 46. The slurry pump 42 is located in the slurry tank 41 and its output port is connected to the side of the test chamber 2 through a slurry conveying pipe 43. A valve 431 is installed on the slurry conveying pipe 43 to precisely control the flow rate of the slurry. The stirring motor 44 is located on the top of the slurry tank 41 and a stirring rod 45 is connected to its output shaft. The stirring motor 44 and the stirring rod 45 prevent the slurry from settling and maintain the uniformity of the slurry concentration. In addition, the coolant pump 46 is located in the coolant tank 47 and its output port is connected to the liquid delivery pipe 48, which extends to the liquid collection ring 49 at the top of the fixed cylinder 31. The liquid collection ring 49 is provided with a discharge pipe 491 connected to the discharge pump. The coolant system cools the cylinder liner, controls the test temperature, and improves the test accuracy. The discharge pump facilitates the recovery or replacement of coolant and is easy to maintain. Meanwhile, the reciprocating test mechanism 5 is mounted on the slide of the slab press 1 and tests the cylinder liner through the nitrile rubber piston 51 on it. It is also used to disassemble and replace the nitrile rubber piston during the test, and to agitate the coal gangue slurry during the test. The reciprocating test mechanism 5 also includes a lifting rod 52, a stirring impeller 56, a drive rod 57, and a disassembly / assembly block 591. The lifting rod 52 is inserted into a fixed seat 11 on the front side of the slide of the slab press 1. The fixed seat 11 is connected to the slab press 1 by several fastening bolts 12. The lifting rod 52 is fixed to facilitate its assembly and disassembly on the slide of the inserting bed 1. The lower end of the lifting rod 52 is connected to a retaining ring 54 via a fixing ring 53. The diameter of the retaining ring 54 is larger than the diameter of the fixing ring 53 and smaller than the diameter of the lifting rod 52. The lifting rod 52 and the retaining ring 54 limit the up and down movement of the nitrile rubber piston 51. The nitrile rubber piston 51 is sleeved on the fixing ring 53. The lifting rod 52, the fixing ring 53 and the retaining ring 54 are evenly distributed with offset grooves 55. Furthermore, the stirring impeller 56 is rotatably connected to the test chamber 2 and located in the fixed cylinder 31. The drive rod 57 is connected to the stirring impeller 56 and has a spiral groove 571 on it. The lifting rod 52 has a threaded rod 58 threadedly connected to its side and inserted into the spiral groove 571. The spiral groove 571 of the stirring impeller 56 and the drive rod 57 automatically stirs the coal gangue slurry when the piston reciprocates, preventing sedimentation. The lifting rod 52 has an observation hole 521 above the threaded rod 58, which can observe the position of the disassembly block 591 and the spiral groove 571 on the drive rod 57. The drive rod 57 is inserted into the lifting rod 52 and has a fixed post 59 at its upper end. Disassembly blocks 591 are evenly distributed along the circumference of the fixed post 59 and slide in one with the borrowing groove 55. The disassembly block 591 has a trapezoidal structure. The disassembly block 591 adopts a trapezoidal structure and slides in one with the borrowing groove 55 to realize the quick disassembly and assembly of the piston, saving time and improving testing efficiency.

[0030] Detailed implementation methods and principles: When testing the wear resistance of the laser cladding coating on the inner bore of the cylinder liner of a mining water injection pump, the cylinder liner is placed in the fixed cylinder 31 inside the test chamber 2. The cylinder liner is axially blocked and positioned by the limiting ring 33 on the inner wall of the fixed cylinder 31. Then, the tightening screw 34 on the outside of the fixed cylinder 31 is tightened so that the end of the tightening screw 34 abuts against the outer wall of the cylinder liner, thereby achieving radial fixation of the cylinder liner inside the fixed cylinder 31. Then, the new nitrile rubber piston 51 is fitted onto the fixed post 59 at the top of the drive rod 57. The nitrile rubber piston 51 contacts the upper side of the disassembly block 591, and the disassembly block 591 is adjusted to be aligned with the borrowing groove 55 on the lifting rod 52. The drive shaft is then held in place by hand. Next, the slide of the slotting bed 1 is slowly lowered. The retaining ring 54 at the lower end of the lifting rod 52 squeezes the nitrile rubber piston 51. Under the action of the upper inclined surface of the disassembly block 591, the nitrile rubber piston 51 is spread open and gradually fitted onto the disassembly block 591. The disassembly block 591 drives the nitrile rubber piston 51 to move in the borrowing groove 55. When the nitrile rubber piston 51 contacts the lifting rod 52, the nitrile rubber piston 51 is disengaged from the disassembly block 591 and finally located on the fixed ring 53 between the lifting rod 52 and the retaining ring 54. At this time, the slide of the slotting bed 1 is in the set initial position. Next, rotate the drive rod 57 so that one of the disassembly blocks 591 is aligned with the observation hole 521 on the lifting rod 52, while the spiral groove 571 on the drive rod 57 is aligned with the threaded insert rod 58. Then, twist the threaded insert rod 58 so that the threaded insert rod 58 is inserted into the spiral groove 571 on the drive rod 57. Then, valve 431 and stirring motor 44 are opened. The output shaft of stirring motor 44 drives stirring rod 45 to rotate, stirring coal gangue slurry in slurry tank 41. Then, slurry pump 42 is started to transport coal gangue slurry to test chamber 2 through slurry pipe 43. Coal gangue slurry enters cylinder liner through multiple feed holes 32 at the lower end of fixed cylinder 31 to simulate the actual working medium environment of mine water injection pump cylinder liner. Next, the coolant pump 46 and the drain pump are turned on. The slide of the ram of the slurry bed 1 drives the lifting rod 52 to make a reciprocating linear motion. The nitrile rubber piston 51 at the lower end of the lifting rod 52 moves up and down synchronously with the lifting rod 52, and has continuous frictional contact with the laser cladding coating in the inner hole of the cylinder liner filled with coal gangue slurry. By simulating the actual reciprocating motion of the water injection pump piston and the cylinder liner, the threaded insert 58 on the synchronous lifting rod 52 moves in the spiral groove 571 on the drive rod 57, thereby driving the drive rod 57 and the stirring impeller 56 to rotate reciprocally. The impeller 56 agitates the coal gangue slurry entering the bottom of the fixed cylinder 31, while the spiral groove 571 on the drive rod 57 disturbs the coal gangue slurry inside the cylinder liner. Meanwhile, the cooling medium in the coolant tank 47 is delivered to the liquid-coating ring 49 through the delivery pipe 48 on the coolant pump 46. The liquid-coating ring 49 guides the medium evenly to the upper port of the cylinder liner and the nitrile rubber piston 51 for continuous cooling. The discharge pump discharges the cooling medium from the liquid-coating ring 49 through the discharge pipe 491, thereby testing the wear resistance of the laser cladding coating. After the test is completed, control the slide of the insertion bed 1 to move up to the initial position, turn the threaded insertion rod 58 on the lifting rod 52 to disengage the threaded insertion rod 58 from the spiral groove 571 of the drive rod 57, fix the drive rod 57 by hand, and continue to control the slide of the insertion bed 1 to move up slowly. When the lower inclined surface of the disassembly block 591 contacts the nitrile rubber piston 51, the nitrile rubber piston 51 is spread open and gradually fitted onto the disassembly block 591. The disassembly block 591 drives the nitrile rubber piston 51 to move in the offset groove 55, so that the nitrile rubber piston 51 is disengaged from the fixing ring 53. After the disassembly block 591 is disengaged from the offset groove, the old nitrile rubber piston 51 is removed from the disassembly block 591. Finally, loosen the tightening screw 34 on the outside of the fixing sleeve 31 so that the end of the tightening screw 34 is separated from the outer wall of the cylinder liner. Then remove the cylinder liner from the fixing sleeve 31 and measure the laser cladding coating on the inner bore of the cylinder liner using a measuring device.

[0031] The embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A wear-resistant testing device for laser cladding coating on the inner bore of a mine water injection pump cylinder liner, comprising a slotting bed (1), characterized in that: It also includes a cooling slurry conveying mechanism (4) and a reciprocating test mechanism (5). The test chamber (2) is provided on the workbench of the inserting bed (1). The test chamber (2) is provided with a limiting component (3) for fixing the cylinder liner. The cooling slurry conveying mechanism (4) is located on the side of the test chamber (2) and is used to convey coal gangue slurry into the test chamber (2) and to cool the cylinder liner during the test. The reciprocating test mechanism (5) is set on the slide of the ram of the sluice (1) and tests the cylinder liner through the nitrile rubber piston (51) on it. It is also used to disassemble and replace the nitrile rubber piston during the test, and to stir the coal gangue slurry during the test.

2. The wear resistance testing device for laser cladding coating on the inner bore of a mine water injection pump cylinder liner according to claim 1, characterized in that: The limiting component (3) includes a fixed cylinder (31) and a tightening screw (34). The fixed cylinder (31) is located in the test chamber (2). The inner wall of the fixed cylinder (31) is provided with a limiting ring (33) for blocking the cylinder sleeve. Several tightening screws (34) for pressing the fixed cylinder (31) against the bushing are threaded along the outer circumference of the fixed cylinder (31). Several feed holes (32) are evenly distributed on the side of the lower end of the fixed cylinder (31).

3. The wear resistance testing device for laser cladding coating on the inner bore of a mine water injection pump cylinder liner according to claim 2, characterized in that: The cooling slurry conveying mechanism (4) includes a slurry tank (41), a slurry pump (42), a stirring motor (44), a coolant tank (47), and a coolant pump (46). The slurry pump (42) is located in the slurry tank (41), and its output port is connected to the side of the test chamber (2) through a slurry conveying pipe (43). The stirring motor (44) is located on the top of the slurry tank (41), and a stirring rod (45) is connected to its output shaft. The coolant pump (46) is located in the coolant tank (47), and the liquid conveying pipe (48) connected to its output port extends to the liquid-gathering ring (49) at the top of the fixed cylinder (31). The liquid-gathering ring (49) is provided with a discharge pipe (491) connected to the discharge pump.

4. The wear resistance testing device for laser cladding coating on the inner bore of a mine water injection pump cylinder liner according to claim 2, characterized in that: The reciprocating test mechanism (5) also includes a lifting rod (52), a stirring impeller (56), a drive rod (57), and a disassembly block (591). The lifting rod (52) is mounted on the slide of the ram of the slab bed (1). The lower end of the lifting rod (52) is connected to a retaining ring (54) via a fixing ring (53). The diameter of the retaining ring (54) is larger than the diameter of the fixing ring (53) and smaller than the diameter of the lifting rod (52). The nitrile rubber piston (51) is sleeved on the fixing ring (53). Alternating grooves (591) are evenly distributed along the circumference of the lifting rod (52), the fixing ring (53), and the retaining ring (54). 5) The stirring impeller (56) is rotatably connected to the test chamber (2) and located in the fixed cylinder (31). The driving rod (57) is connected to the stirring impeller (56) and has a spiral groove (571) on it. The lifting rod (52) has a threaded connection on its side to a threaded insert rod (58) inserted into the spiral groove (571). The driving rod (57) is inserted into the lifting rod (52) and has a fixed column (59) at its upper end. Disassembly blocks (591) that slide and cooperate with the borrowing groove (55) are evenly distributed along the circumference of the fixed column (59). The disassembly blocks (591) are trapezoidal in structure.

5. The wear resistance testing device for laser cladding coating on the inner bore of a mine water injection pump cylinder liner according to claim 2, characterized in that: The fixed cylinder (31) is evenly distributed with several connecting ears (311), and each connecting ear (311) is fixed to the test box (2) by connecting bolts.

6. The wear resistance testing device for laser cladding coating on the inner bore of a mine water injection pump cylinder liner according to claim 3, characterized in that: A valve (431) is installed on the slurry delivery pipe (43).

7. The wear resistance testing device for laser cladding coating on the inner bore of a mine water injection pump cylinder liner according to claim 4, characterized in that: The lifting rod (52) is inserted into the fixed seat (11) on the front side of the slide of the ram of the ramming bed (1), and the fixed seat (11) is fixed to the lifting rod (52) by a number of fastening bolts (12).

8. The wear resistance testing device for laser cladding coating on the inner bore of a mine water injection pump cylinder liner according to claim 4, characterized in that: The lifting rod (52) has an observation hole (521) above the threaded insert rod (58).

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