Method and device for dismounting and mounting a slurry pump piston

Abstract

The application discloses a dismounting and mounting method and device for a slurry pump piston and belongs to the technical field of slurry pumps. The device comprises a fixing structure, a dismounting tool, a mounting tool and a piston nut, the fixing structure comprises a base and a clamping jaw; the dismounting tool comprises a lower annular body, a handle and a lever; the mounting tool comprises an upper annular body and a pressing rod; when the snap spring is dismounted, the lower annular body is arranged on the upper side of the piston core and is sleeved on the piston screw rod, the lower end of the lever is inserted into the snap opening of the snap spring, the handle is pushed, and the lever pries open the snap opening of the snap spring; when the snap spring is mounted, the upper annular body, the lower annular body and the piston nut are sequentially arranged on the upper side of the piston core from bottom to top, the snap spring is arranged obliquely and the non-upward end of the snap spring is hooked on the annular groove, and the snap spring is located on the opposite side of the pressing rod; the lever is located directly above the non-upward end of the snap spring and is located on one side of the pressing rod in the rotating direction; the handle is pushed, the lower end of the lever is pressed on the upper side of the snap spring, the handle is continuously rotated, the lever is abutted against the pressing rod, and the pressing rod is pressed on the upper side of the snap spring.

Description

Technical Field

[0001] The invention belongs to the technical field of mud pumps, and in particular relates to a method and device for disassembling and assembling a mud pump piston. Background Art

[0002] During the current drilling process, a mud pump may be used to deliver flushing fluids such as mud or water into the borehole. In the commonly used positive circulation drilling method, a surface flushing medium—such as water, mud, or a polymer flushing fluid—is delivered under pressure through a high-pressure hose, a faucet, and the center hole of the drill string directly to the bottom of the drill bit. This serves to cool the drill bit and remove and transport cut rock to the surface. Commonly used mud pumps are piston or plunger-type. A power engine rotates the pump's crankshaft, which, through a crosshead, drives a piston or plunger in reciprocating motion within the pump cylinder. Alternating suction and discharge valves achieve pressure delivery and circulation of the flushing fluid.

[0003] For example, patent application number CN201020645575.6 discloses a monolithic piston for a mud pump. The framework has a ring platform at the top, and a slot on the outer edge of the framework behind the ring platform. An annular seal ring, a retaining spring, and a compression ring are nested in sequence within the ring platform. The inner edge of the compression ring fits into the slot, and the side of the retaining spring compresses the compression ring. The framework is truncated cone-shaped, with a core hole along the center of the shaft.

[0004] For example, the patent application number CN200520046280.6 discloses a long-life mud pump piston, which is composed of a piston core, a sealing ring, a nylon ring, a rubber cup, a pressure plate, and a retaining spring; the piston cup is formed by bonding the rubber cup and the nylon ring, the piston cup is assembled on the piston core, and the pressure plate and retaining spring fix the piston cup on the piston core; a sealing lip is provided on the inner hole of the piston cup.

[0005] For example, patent application number CN200520046280.6 discloses a novel drilling pump piston, which is composed of a piston core, a rubber cup, a rubber sealing ring, a sealing ring, a pressure plate, a retaining ring and a fastening nut.

[0006] like Fig. 1-2 As shown, the existing mud pump piston includes a piston core 1, a piston 2 and a pressure plate 3 mounted on the piston core 1, a ring groove 4 coaxially arranged on the top of the piston core 1, a retaining spring 5 mounted on the ring groove 4, and a bolt and screw 6 inserted into the piston core 1. The upper side of the piston core 1 is coaxially mounted on a circular boss. The piston 2 and pressure plate 3 are both coaxially mounted on the boss. The piston 2 and pressure plate 3 are sequentially arranged from bottom to top and are both mounted outside the boss. The ring groove 4 is coaxially mounted on the top of the boss. The piston core 1 and the boss are provided with vertical through-holes for the bolt and screw 6 to pass upward. The bolt and screw 6 is arranged vertically, located in the through-holes, with its head at its lower end and its upper end extending upward through the boss. The retaining spring 5 is coaxially mounted on the boss and presses against the upper side of the pressure plate 3.

[0007] The mud pump piston needs to be replaced after a period of use, so the snap spring needs to be disassembled and assembled. The prior art discloses a combined disassembling tool for the piston snap spring (application number CN201921634778.2), but the tool can only be used to disassemble the snap spring and has a complex structure. SUMMARY

[0008] To solve the foregoing problems, the embodiments of the present application provide a mud pump piston disassembling and assembling method and device for disassembling and assembling the snap spring. The technical solution is as follows:

[0009] In one aspect, the embodiment of the present application provides a dismounting device for a slurry pump piston, which comprises a fixing structure 7 for fixing a piston core 1, a dismounting tool 8 for dismounting a snap spring 5, a mounting tool 9 for mounting the snap spring 5, and a piston nut 10 cooperating with a piston screw 6. The fixing structure 7 comprises a base and a plurality of clamping jaws on the upper side of the base, the clamping jaws are adjustable up and down and clamped to the upper side of the piston core 1, and the clamping jaws are arranged around the piston core 1. The dismounting tool 8 comprises a lower annular body 81, a handle 82 on the upper side of the lower annular body 81, and a lever 83 extending downward on the peripheral surface of the lower annular body 81 and downward relative to the lower annular body 81. The middle part of the lower annular body 81 is provided with a lower through hole for the piston screw 6 to pass through. The lever 83 is located on the adjacent outer side of the top of the piston core 1 and is opposite to the snap spring 5. The mounting tool 9 comprises an upper annular body 91 and a pressing rod 92 horizontally arranged on the peripheral surface of the upper annular body 91. The middle part of the upper annular body 91 is provided with an upper through hole for the piston screw 6 to pass through. The outer end of the pressing rod 92 is located on the outer side of the snap spring 5, and the lower side is located adjacent to the upper side of the lower side of the upper annular body 91 or is flush with the lower side of the upper annular body 91. The lower side is located 3-5 mm below the lower end of the lever 83. The lever 83 is located outside the upper annular body 91. When dismounting and mounting the snap spring 5, the bottom of the piston core 1 is placed on the base and clamped by the clamping jaws. When dismounting the snap spring 5, the lower annular body 81 is placed on the upper side of the piston core 1 and is sleeved on the piston screw 6. The lower end of the lever 83 is inserted into the snap spring 5. Push the handle 82 to rotate the lower annular body 81. The lever 83 opens the snap spring 5 to separate the snap spring 5 from the ring groove 4. When mounting the snap spring 5, the upper annular body 91, the lower annular body 81 and the piston nut 10 are sequentially arranged on the upper side of the piston core 1 from bottom to top. The lower annular body 81 and the upper annular body 91 are sleeved on the piston screw 6. The piston nut 10 is fixed on the piston screw 6. The snap spring 5 is arranged obliquely, and the non-upturned end is hooked on the ring groove 4. The upper annular body 91 is located in the snap spring 5. The upturned end of the snap spring 5 abuts against the peripheral surface of the upper annular body 91 and is located on the opposite side of the pressing rod 92. The lower annular body 81 is located above the snap spring 5. The lever 83 is located directly above the non-upturned end of the snap spring 5 and is located on one side of the pressing rod 92 in the rotating direction. Push the handle 82. The lower end of the lever 83 presses below the upper side of the snap spring 5 to press the snap spring 5. Continue to rotate the handle 82. The lever 83 abuts against the pressing rod 92. The upper annular body 91 rotates with the lower annular body 81. The pressing rod 92 presses the upper side of the snap spring 5 to completely press the snap spring 5 into the ring groove 4.

[0010] Wherein, the base in the embodiment of the present application comprises a ring-shaped bottom plate 71 and a plurality of fixing lugs uniformly distributed on the outer side of the ring-shaped bottom plate 71; the fixing lugs are arranged along the radial direction of the ring-shaped bottom plate 71; the clamping jaw comprises a pressing plate 74, a fixing nut 75, and a fixing screw rod 72 and a guide rod 73 arranged in sequence from inside to outside on the upper side of the fixing lug; the fixing screw rod 72 and the guide rod 73 are both arranged vertically; the fixing screw rod 72 is located on the adjacent outer side of the piston core 1; the pressing plate 74 is provided with a screw rod through hole and a guide hole in sequence from inside to outside on the upper side of the pressing plate 74; the fixing nut 75 is arranged on the fixing screw rod 72 and located on the upper side of the pressing plate 74; the guide rod 73 and the fixing screw rod 72 pass through the guide hole and the screw rod through hole respectively; when the snap spring 5 is disassembled and assembled, the piston core 1 is placed on the ring-shaped bottom plate 71 and located in the space surrounded by the fixing screw rod 72; the head of the piston screw rod 6 is located in the center hole of the ring-shaped bottom plate 71 and suspended; the pressing plate 74 is located on the outer side of the push rod 83 and the pressing rod 92 and is pressed on the upper side of the piston core 1; the handle 82 is located above the guide rod 73 and the fixing screw rod 72.

[0011] Specifically, the number of clamping jaws in the embodiment of the present application is three; the ring-shaped bottom plate 71 is coaxially arranged with the piston core 1; the pressing plate 74 is a rectangular plate arranged along the radial direction of the piston core 1; the three pressing plates 74 are uniformly distributed; the upper end of the guide rod 73 is located in the guide hole; and the fixing screw rod 72 extends upward relative to the fixing nut 75.

[0012] Specifically, the lower ring-shaped body 81 and the upper ring-shaped body 91 in the embodiment of the present application are both circular ring structures coaxial with the piston core 1 and have an outer diameter less than or equal to the diameter of the top of the piston core 1; the outer diameter of the upper ring-shaped body 91 is smaller than that of the lower ring-shaped body 81.

[0013] Wherein, the pressing rod 92 in the embodiment of the present application is a round rod arranged along the radial direction of the upper ring-shaped body 91 and has a lower side flush with the lower side of the upper ring-shaped body 91.

[0014] Wherein, the push rod 83 in the embodiment of the present application is vertically arranged on one side and obliquely arranged on the other side from top to bottom to form a pointed end.

[0015] Wherein, the handle 82 in the embodiment of the present application is arranged along the radial direction of the lower ring-shaped body 81 and has an inner end bent downward and fixed at the upper side of the outer edge of the lower ring-shaped body 81.

[0016] Specifically, the handle 82 and the push rod 83 in the embodiment of the present application are both located on the same side of the lower ring-shaped body 81; when the snap spring 5 is assembled, the vertical side of the push rod 83 abuts against the pressing rod 92.

[0017] On the other hand, the embodiment of the present application also provides a disassembly and assembly method of a snap spring, which adopts the disassembly and assembly device of the mud pump piston described above, and the method comprises the following steps:

[0018] The dismounting process of the circlip:

[0019] S101 Fix the piston core: put the bottom of the piston core 1 on the base and clamp it with the clamping jaws.

[0020] S102 Place the dismounting tool: put the lower annular body 81 on the upper side of the piston core 1 and fit it on the piston stem 6, and insert the lower end of the lever 83 into the clamping hole of the circlip 5.

[0021] S103 Dismount the circlip: push the handle 82, the lever 83 will open the clamping hole of the circlip 5 to separate the circlip 5 from the ring groove 4.

[0022] The installation of the circlip includes the following steps:

[0023] S201 Fix the piston core: put the bottom of the piston core 1 on the base and clamp it with the clamping jaws.

[0024] S202 Place the circlip: place the circlip 5 obliquely; hook the non-upturned end of the circlip 5 on the ring groove 4, and place the upturned end of the circlip 5 on the top of the piston core 1.

[0025] S203 Place the installation tool: place the upper annular body 91 on the upper side of the piston core 1 and fit it on the piston stem 6, the upper annular body 91 is located inside the circlip 5, the upturned end of the circlip 5 abuts against the circumferential surface of the upper annular body 91 and is located on the opposite side of the pressure rod 92.

[0026] S204 Place the dismounting tool: place the lower annular body 81 on the upper side of the upper annular body 91 and fit it on the piston stem 6, the lower annular body 81 is located above the circlip 5, the lever 83 is located directly above the non-upturned end of the circlip 5 and is located on one side of the pressure rod 92 in the rotating direction.

[0027] S205 Install the piston nut: fix the piston nut 10 on the piston stem 6 and press it on the upper side of the lower annular body 81.

[0028] S206 Pre-press and rotate: push the handle 82, the upper annular body 91 rotates, the lower end of the lever 83 presses below the upper side of the circlip 5 to press the circlip 5.

[0029] S207 Push the upper annular body: continue to rotate the handle 82, the lever 83 abuts against the pressure rod 92, and the upper annular body 91 rotates with the lower annular body 81.

[0030] S208 Install the circlip: continue to rotate the handle 82 by at least 360°, the pressure rod 92 presses on the upper side of the circlip 5 to completely press the circlip 5 into the ring groove 4.

[0031] Preferably, the dismounting process of the snap spring: the handle 82 is rotated vertically with the vertical side of the lever 83 facing away from the handle 82; the mounting process of the snap spring: the handle 82 is rotated counterclockwise, and the vertical side of the lever 83 is abutted against the pressing rod 92.

[0032] The technical scheme provided by the embodiment of the present application has the beneficial effects that: the embodiment of the present application provides a dismounting method and device for a mud pump piston, the fixing structure and the dismounting tool cooperate to realize the dismounting of the snap spring; the fixing structure, the dismounting tool, the mounting tool and the piston nut cooperate to realize the mounting of the snap spring; the whole device has a simple structure, and the dismounting process is easy. BRIEF DESCRIPTION OF DRAWINGS

[0033] Fig. 1 is a structural schematic view of an existing mud pump piston;

[0034] Fig. 2 is a top view of the existing mud pump piston;

[0035] Fig. 3 is a structural schematic view of the dismounting device for the mud pump piston in the embodiment of the present application when the snap spring is dismounted;

[0036] Fig. 4 is a structural schematic view of the dismounting device for the mud pump piston in the embodiment of the present application when the snap spring is mounted;

[0037] Fig. 5 is a structural schematic view of the fixing structure when the piston core is fixed;

[0038] Fig. 6 is a structural schematic view of the fixing structure;

[0039] Fig. 7 is a structural schematic view of the combination of the dismounting tool and the mounting tool;

[0040] Fig. 8 is a structural schematic view of the dismounting tool;

[0041] Fig. 9 is a top view of the dismounting tool;

[0042] Fig. 10 is a side view of the mounting tool;

[0043] Fig. 11 is a top view of the mounting tool.

[0044] In the figure: 1 piston core, 2 piston, 3 pressing plate, 4 ring groove, 5 snap spring, 6 piston screw, 7 fixing structure, 8 dismounting tool, 9 mounting tool, 10 piston nut, 11 lower positioning hole, 12 upper positioning hole;

[0045] 71 annular bottom plate, 72 fixing screw, 73 guide rod, 74 pressing plate, 75 fixing nut;

[0046] 81 lower annular body, 82 handle, 83 lever;

[0047] 91 upper annular body, 92 pressing rod. DETAILED DESCRIPTION

[0048] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings.

[0049] Embodiment 1

[0050] Reference Fig. 3-11 , embodiment 1 provides a dismounting device for a slurry pump piston, which comprises a fixing structure 7, a dismounting tool 8, a mounting tool 9, a piston nut 10 and the like, and a flat screwdriver according to needs. Among them, the fixing structure 7 is used to fix the slurry pump piston. The dismounting tool 8 (which can cooperate with the flat screwdriver) is used to dismount the snap spring 5. The mounting tool 9, the dismounting tool 8 and the piston nut 10 cooperate to mount the snap spring 5. The piston nut 10 cooperates with the piston screw 6, which can lock the mounting tool 9 and the dismounting tool 8 on the piston core 1.

[0051] Among them, the fixing structure 7 comprises a base and a plurality of (preferably greater than or equal to three) clamping jaws on the upper side of the base, the clamping jaws can be adjusted up and down and are clamped to the upper side of the piston core 1; the plurality of clamping jaws are arranged around the piston core 1, which is preferably uniformly distributed.

[0052] Among them, the dismounting tool 8 comprises a lower annular body 81, a handle 82 on the upper side of the lower annular body 81 and a lever 83 extending downward on the peripheral surface of the lower annular body 81 and relative to the lower annular body 81, and the like. The lower annular body 81 is coaxially arranged with the piston core 1 and has a lower through hole (slightly larger than the piston screw 6) coaxially arranged in the middle for the piston screw 6 to pass through. The lever 83 is located adjacent to the outer side of the top of the piston core 1 (the top of the boss) and is opposite to the snap spring 5. Specifically, the lower annular body 81 is a circular structure coaxial with the piston core 1, and the outer diameter is less than or equal to the diameter of the top of the piston core 1. The lever 83 is vertically arranged, one side of which is vertically arranged, and the other side is obliquely arranged from top to bottom to form a sharp end. The sharp end is convenient for inserting into the snap spring 5. The oblique side of the lever 83 is convenient for guiding one end of the snap spring 5 upward. Among them, the handle 82 is arranged along the radial direction of the lower annular body 81, the inner end is bent downward and fixed at the upper side of the outer edge of the lower annular body 81, and the outer end is located on the outer side of the fixing structure 7, which cannot interfere with the fixing structure 7.

[0053] The installation tool 9 comprises an upper annular body 91 and a pressure rod 92 horizontally arranged on the circumferential surface of the upper annular body 91, etc. The upper annular body 91 is coaxially arranged with the piston core 1 and has a through hole in the middle for the piston screw 6 to pass through. Specifically, the upper annular body 91 is a circular ring structure coaxial with the piston core 1 and has an outer diameter smaller than the diameter of the top of the piston core 1. The outer diameter of the upper annular body 91 is smaller than the outer diameter of the lower annular body 81 to facilitate the placement of the bent end of the snap spring 5 when the snap spring 5 is installed. The outer end of the pressure rod 92 is located outside the snap spring 5, and the lower side is located adjacent to the upper side of the lower side of the upper annular body 91 or is flush with the lower side of the upper annular body 91. The lower side is located 3-5 mm below the lower end of the lever 83 to achieve pre-pressing of the snap spring 5. Specifically, the pressure rod 92 is a circular rod (or a rod-shaped structure with an arc-shaped lower side), which is arranged along the radial direction of the upper annular body 91, and the lower side is flush with the lower side of the upper annular body 91. The lever 83 is located outside the upper annular body 91.

[0054] When disassembling and installing the snap spring 5, the bottom of the piston core 1 is placed on the base and clamped by the clamping jaw. Specifically, the base comprises an annular bottom plate 71 and a plurality of (at least three) fixing lugs uniformly distributed on the outer side of the annular bottom plate 71, etc. The fixing lugs are arranged along the radial direction of the annular bottom plate 71. The clamping jaw comprises a pressing plate 74, a fixing nut 75, and a fixing screw 72 and a guide rod 73 arranged in sequence from inside to outside on the upper side of the fixing lug, etc. The fixing screw 72 and the guide rod 73 are both vertically arranged, and the fixing screw 72 is located adjacent to the outer side of the piston 2. The pressing plate 74 is provided with a screw through hole and a guide hole in sequence from inside to outside, the screw through hole is arranged opposite to the fixing screw 72 and is slightly larger than the fixing screw 72; the guide hole is arranged opposite to the guide rod 73 and is slightly larger than the guide rod 73. The fixing nut 75 is arranged on the fixing screw 72 and is located on the upper side of the pressing plate 74, and the guide rod 73 and the fixing screw 72 pass through the guide hole and the screw through hole respectively. When disassembling and installing the snap spring 5, the piston core 1 is placed on the annular bottom plate 71 and is located in the space surrounded by the fixing screw 72, the head of the piston screw 6 is located in the central hole of the annular bottom plate 71 and is suspended, the pressing plate 74 is located outside the lever 83 and the pressure rod 92 and is pressed on the upper side of the piston core 1, and the handle 82 is located above the guide rod 73 and the fixing screw 72.

[0055] The process of disassembling the piston core 1 is to rotate the fixing nut 75 upward to a height that allows the pressing plate 74 to move up to above the guide rod 73; move the pressing plate 74 up to above the guide rod 73 to separate the guide rod 73 from the guide hole; rotate the pressing plate 74 to rotate the inner end of the pressing plate 74 away from the piston core 1. The piston core 1 can be taken out by operating multiple clamping jaws. Similarly, the method of installing the piston core 1 is opposite to the above process.

[0056] When the clamp spring 5 is disassembled, the lower annular body 81 is placed on the upper side of the piston core 1 and is sleeved on the piston screw 6, the lower end of the lever 83 is inserted into the clamping opening of the clamp spring 5, the handle 82 is pushed to rotate the lower annular body 81, and then the lever 83 is rotated, the lever 83 expands the clamping opening of the clamp spring 5 (if the clamp spring 5 cannot be separated from the ring groove 4, a flat screwdriver can be used to lift the clamp spring 5 upward at the expansion position to separate, and it has been verified that the disassembly tool 8 can basically separate the clamp spring 5 from the ring groove 4 without the aid of a flat screwdriver) to separate the clamp spring 5 from the ring groove 4.

[0057] When the clamp spring 5 is installed, the upper annular body 91, the lower annular body 81 and the piston nut 10 are sequentially arranged on the upper side of the piston core 1 from bottom to top, the lower annular body 81 and the upper annular body 91 are sleeved on the piston screw 6, and the piston nut 10 is fixed on the piston screw 6. The clamp spring 5 is arranged obliquely, and the non-lifting end of the clamp spring 5 is hooked on the ring groove 4, the upper annular body 91 is located in the clamp spring 5, the lifting end of the clamp spring 5 abuts against the circumferential surface of the upper annular body 91 and is located on the opposite side of the pressure rod 92, and the lower annular body 81 is located above the clamp spring 5. The lever 83 is located directly above the non-lifting end of the clamp spring 5 and is located on one side of the pressure rod 92 in the rotating direction. The handle 82 is pushed, the lower annular body 81 rotates, the upper annular body 91 rotates or does not rotate, and the lower end of the lever 83 presses the clamp spring 5 below the upper side of the clamp spring 5. Continue to rotate the handle 82, the lever 83 abuts against the side of the pressure rod 92 opposite to the rotating direction, and the upper annular body 91 rotates with the lower annular body 81. The pressure rod 92 presses the upper side of the clamp spring 5 to completely press the clamp spring 5 into the ring groove 4.

[0058] Specifically, referring to Fig. 3-5 In the embodiment of the present application, the pressing plate 74 is a rectangular plate arranged radially along the piston core 1, the upper end of the guide rod 73 is located in the guide hole, and the fixed screw rod 72 extends upward relative to the fixed nut 75.

[0059] Specifically, referring to Fig. 7-11 In the embodiment of the present application, the handle 82 and the lever 83 are located on the same side of the lower annular body 81, and the lever 83 is located directly below the handle 82. When the clamp spring 5 is installed, the vertical side of the lever 83 abuts against the pressure rod 92.

[0060] Further, referring to Fig. 9 and 11A lower positioning hole 11 is arranged on the lower annular body 81 and opposite to the push rod 83, and the included angle between the lower positioning hole 11 and the push rod 83 is about 180°. When the snap spring 5 is installed, the lower positioning hole 11 is directly above the raised end of the snap spring 5. An upper positioning hole 12 is arranged on the upper annular body 91 and opposite to the pressing rod 92, and the included angle between the upper positioning hole 12 and the pressing rod 92 is 150-170°. When the snap spring 5 is installed, the upper positioning hole 12 is directly opposite the raised end of the snap spring 5. The foregoing structure ensures that the push rod 83 is directly above the non-raised end of the snap spring 5 and is located on one side of the pressing rod 92 in the rotating direction. The positioning holes facilitate the positioning of the dismounting tool 8 and the installation tool 9.

[0061] Embodiment 2

[0062] Embodiment 2 discloses a dismounting device for a slurry pump piston, which has basically the same structure as that of Embodiment 1, except that the number of clamping jaws in this embodiment is three; and correspondingly, the number of fixing ears is three, which are evenly distributed. Correspondingly, the number of pressing plates 74, fixing nuts 75, fixing screws 72 and guide rods 73 is three, and the three pressing plates 74 are evenly distributed.

[0063] Embodiment 3

[0064] Embodiment 3 provides a dismounting method, which uses the dismounting device for a slurry pump piston disclosed in Embodiments 1-2, and the method comprises the following steps:

[0065] Dismounting process of the snap spring:

[0066] S101 fixing the piston core: the fixing structure 7 is placed on the ground, the bottom of the piston core 1 is placed on the base and clamped by the clamping jaws.

[0067] S102 placing the dismounting tool: the lower annular body 81 is placed on the upper side of the piston core 1 and sleeved on the piston screw 6, and the lower end of the push rod 83 is inserted into the snap spring 5, without the need to set the piston nut 10.

[0068] S103 dismounting the snap spring: the handle 82 is pushed (clockwise or counterclockwise), and the push rod 83 pries open the snap spring 5 to separate the snap spring 5 from the ring groove 4. If the snap spring 5 cannot be separated from the ring groove 4, a flathead screwdriver can be used to lift the snap spring 5 upward at the prying position to separate it.

[0069] The installation of the snap spring comprises the following steps:

[0070] S201 fixing the piston core: the fixing structure 7 is placed on the ground, the bottom of the piston core 1 is placed on the base and clamped by the clamping jaws.

[0071] S202 placing the snap spring: the snap spring 5 is placed obliquely; the non-raised end of the snap spring 5 is hooked on the ring groove 4, and the raised end of the snap spring 5 is placed on the top of the piston core 1.

[0072] S203 Place the installation tool: Place the upper annular body 91 on the upper side of the piston core 1 and sleeve it on the piston screw 6. The upper annular body 91 is located in the retaining ring 5. The raised end of the retaining ring 5 rests on the circumferential surface of the upper annular body 91 and is located on the opposite side of the pressure rod 92.

[0073] S204 Place the disassembly tool: Place the lower annular body 81 on the upper side of the upper annular body 91 and sleeve it on the piston screw 6. The lower annular body 81 is located above the retaining ring 5. The shift rod 83 is located directly above the non-raised end of the retaining ring 5 and is located on the side of the pressure rod 92 in the rotation direction.

[0074] S205 Install the piston nut: Fix the piston nut 10 on the piston screw 6 and press it against the upper side of the lower annular body 81.

[0075] S206 Pre-compression Rotation: Push the handle 82 (clockwise or counterclockwise), rotating the upper annular body 91. The lower end of the lever 83 (when rotated to the tilted end of the circlip 5) presses against the upper side of the circlip 5, compressing it downward. This process allows the non-tilted end of the circlip 5 to align with the annular groove 4, reducing the tilt of the tilted end of the circlip 5 and facilitating subsequent movement of the pressure lever 92. This process may directly press the circlip 5 partially or completely into the annular groove 4. Even if the circlip 5 is pressed into the annular groove 4, steps S207 and S208 are still executed to ensure that the circlip 5 is fully pressed into the annular groove 4.

[0076] S207 pushes the upper annular body: continue to rotate the handle 82, the upper annular body 91 rotates, the shift rod 83 presses against the side of the pressure rod 92 facing away from the rotation direction, and the upper annular body 91 rotates along with the lower annular body 81.

[0077] S208 Installing the retaining spring: Based on step S207, continue to rotate the handle 82 at least 360°, and the pressure rod 92 presses on the upper side of the retaining spring 5 to completely press the retaining spring 5 into the annular groove 4.

[0078] Preferably, the process of disassembling the circlip is as follows: the handle 82 is rotated vertically away from the lever 83. The process of installing the circlip is as follows: the handle 82 is rotated counterclockwise, and the vertical side of the lever 83 is pressed against the pressure rod 92.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. The disassembly and assembly device of the mud pump piston is characterized in that: The invention comprises a fixing structure (7) for fixing the piston core (1), a disassembly tool (8) for disassembling the retaining spring (5), an installation tool (9) for installing the retaining spring (5), and a piston nut (10) matched with the piston screw (6), wherein the fixing structure (7) comprises a base and a plurality of clamping claws on the upper side thereof, wherein the clamping claws can be adjusted up and down and are clamped on the upper side of the piston core (1), and the plurality of clamping claws are arranged around the piston core (1); The disassembly tool (8) comprises a lower annular body (81), a handle (82) on the upper side of the lower annular body (81), and a shift rod (83) on the circumference of the lower annular body (81) and extending downward relative to the lower annular body (81); a lower through hole for the piston screw (6) to pass through is provided in the middle of the lower annular body (81); the shift rod (83) is located adjacent to the outer side of the top of the piston core (1) and is arranged opposite to the retaining ring (5); The installation tool (9) comprises an upper annular body (91) and a pressure rod (92) arranged horizontally on its circumference, wherein the middle portion of the upper annular body (91) is provided with an upper through hole for the piston screw (6) to pass through; the outer end of the pressure rod (92) is located on the outside of the retaining spring (5), the lower side of the pressure rod (92) is located adjacent to the upper side of the lower side of the upper annular body (91) or is flush with the lower side of the upper annular body (91), and the lower side of the pressure rod (92) is located 3-5 mm below the lower end of the shifting rod (83); the shifting rod (83) is located outside the upper annular body (91); When removing and installing the retaining ring (5), the bottom of the piston core (1) is placed on the base and clamped by the clamping claws; When removing the retaining ring (5), the lower annular body (81) is placed on the upper side of the piston core (1) and sleeved on the piston screw (6), the lower end of the shifting rod (83) is inserted into the bayonet of the retaining ring (5), the handle (82) is pushed to rotate the lower annular body (81), and the shifting rod (83) opens the bayonet of the retaining ring (5) to separate the retaining ring (5) from the ring groove (4); When installing the retaining ring (5), the upper annular body (91), the lower annular body (81) and the piston nut (10) are arranged on the upper side of the piston core (1) from bottom to top, the lower annular body (81) and the upper annular body (91) are sleeved on the piston screw (6), and the piston nut (10) is fixed on the piston screw (6). The retaining ring (5) is tilted and its non-raised end is hooked on the ring groove (4). The upper annular body (91) is located in the retaining ring (5), and the raised end of the retaining ring (5) is against the circumferential surface of the upper annular body (91) and is located on the opposite side of the pressure rod (92); The lower annular body (81) is located above the retaining spring (5), and the shift rod (83) is located directly above the non-tilted end of the retaining spring (5) and is located on the side of the pressure rod (92) in the rotation direction; when the handle (82) is pushed, the lower end of the shift rod (83) presses against the upper side of the retaining spring (5) to press the retaining spring (5), and the handle (82) is continued to be rotated, the shift rod (83) is pressed against the pressure rod (92), and the upper annular body (91) rotates along with the lower annular body (81), and the pressure rod (92) presses against the upper side of the retaining spring (5) to completely press the retaining spring (5) into the annular groove (4).

2. The disassembly and assembly device of the mud pump piston according to claim 1, characterized in that: The base includes an annular bottom plate (71) and a plurality of fixing ears uniformly distributed on the outside thereof; the fixing ears are arranged radially along the annular bottom plate (71); the clamping jaw includes a pressure plate (74), a fixing nut (75), and a fixing screw (72) and a guide rod (73) arranged on the upper side of the fixing ear and arranged in sequence from the inside to the outside, the fixing screw (72) and the guide rod (73) are both arranged vertically, the fixing screw (72) is located on the adjacent outer side of the piston (2), the pressure plate (74) is provided with a screw through hole and a guide hole in sequence from the inside to the outside, the fixing nut (75) is provided on the fixing screw (72) and is located on the upper side of the pressure plate (74), and the guide rod (73) and the fixing screw (72) pass through the guide hole and the screw through hole respectively; When removing and installing the retaining ring (5), the piston core (1) is placed on the annular base plate (71) and is located in the space surrounded by the fixing screw (72). The head of the piston screw (6) is located in the center hole of the annular base plate (71) and is suspended in the air. The pressure plate (74) is located outside the shift rod (83) and the pressure rod (92) and is pressed against the upper side of the piston core (1). The handle (82) is located above the guide rod (73) and the fixing screw (72).

3. The slurry pump piston disassembly and assembly device according to claim 2, characterized in that: The number of the clamping jaws is three, the annular base plate (71) is coaxially arranged with the piston core (1), the pressure plate (74) is a rectangular plate radially arranged along the piston core (1), and the three pressure plates (74) are evenly distributed. The upper end of the guide rod (73) is located in the guide hole, and the fixing screw (72) extends upward relative to the fixing nut (75).

4. The slurry pump piston disassembly and assembly device according to claim 1, characterized in that: The lower annular body (81) and the upper annular body (91) are both circular ring structures coaxial with the piston core (1) and their outer diameters are both less than or equal to the diameter of the top of the piston core (1). The outer diameter of the upper annular body (91) is smaller than the outer diameter of the lower annular body (81).

5. The slurry pump piston disassembly and assembly device according to claim 1, characterized in that: The pressure rod (92) is a round rod, which is arranged along the radial direction of the upper annular body (91), and its lower side is flush with the lower side of the upper annular body (91).

6. The slurry pump piston disassembly and assembly device according to claim 1, characterized in that: The shifting rod (83) is arranged vertically, with one side thereof being arranged vertically and the other side thereof being arranged obliquely from top to bottom to form a tip.

7. The slurry pump piston disassembly and assembly device according to claim 6, characterized in that: The handle (82) is arranged along the radial direction of the lower annular body (81), and its inner end is bent downward and fixed to the upper outer edge of the lower annular body (81).

8. The slurry pump piston disassembly and assembly device according to claim 7, characterized in that: The handle (82) and the shifting rod (83) are both located on the same side of the lower annular body (81); when the retaining ring (5) is installed, the vertical side of the shifting rod (83) rests on the pressing rod (92).

9. A disassembly and assembly method using the disassembly and assembly device for a mud pump piston according to any one of claims 1 to 8, characterized in that: include: Removal process of the circlip: S101 Fixing the piston core: placing the bottom of the piston core (1) on the base and clamping it with the clamping claws; S102: Place the disassembly tool: Place the lower annular body (81) on the upper side of the piston core (1) and sleeve it onto the piston screw (6), inserting the lower end of the lever (83) into the bayonet of the retaining ring (5); S103: Remove the retaining ring: Push the handle (82), and the lever (83) opens the retaining ring of the retaining ring (5) to separate the retaining ring (5) from the ring groove (4); The installation of the circlip includes the following steps: S201 Fixing the piston core: placing the bottom of the piston core (1) on the base and clamping it with the clamping claws; S202: Place the circlip: Place the circlip (5) at an angle; hook the non-raised end of the circlip (5) on the ring groove (4), and place the raised end of the circlip (5) on the top of the piston core (1); S203: Place the installation tool: Place the upper annular body (91) on the upper side of the piston core (1) and sleeve it on the piston screw (6), the upper annular body (91) is located in the retaining ring (5), and the raised end of the retaining ring (5) is against the circumference of the upper annular body (91) and is located on the opposite side of the pressure rod (92); S204: placing the disassembly tool: placing the lower annular body (81) on the upper side of the upper annular body (91) and sleeved on the piston screw (6), wherein the lower annular body (81) is located above the retaining ring (5), and the shifting rod (83) is located directly above the non-tilted end of the retaining ring (5) and is located on the side of the pressure rod (92) in the rotation direction; S205 Install the piston nut: Fix the piston nut (10) on the piston screw (6) and press it against the upper side of the lower annular body (81); S206 Pre-compression rotation: Push the handle (82), the upper annular body (91) rotates, and the lower end of the shifting rod (83) presses against the upper side of the retaining spring (5) to press the retaining spring (5); S207 pushes the upper annular body: continue to rotate the handle (82), the shifting rod (83) presses against the pressing rod (92), and the upper annular body (91) rotates along with the lower annular body (81); S208 Installing the retaining ring: Continue to rotate the handle (82) at least 360 degrees, and the pressure rod (92) presses on the upper side of the retaining ring (5) to completely press the retaining ring (5) into the annular groove (4).

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