Plunger pump cylinder sleeve dismounting tool

Abstract

The utility model relates to a plunger pump cylinder sleeve dismounting tool, and belongs to the technical field of plunger pump maintenance. According to the scheme, the tool comprises a rod part and an expansion part fixed to one end of the rod part, and the expansion part is used for stretching into a cylinder sleeve to be disassembled and is in tight fit with the inner wall of the cylinder sleeve through expansion; an expansion gap is formed in the outer wall of the expansion part from the lower end in the axial direction, a main pull rod is arranged in an inner hole of the rod part and the expansion part in the axial direction in a penetrating mode, and the end, located at the expansion part, of the main pull rod is provided with an expanding structure used for expanding the expansion part. And a stop structure for stopping the end surface of the rod part is screwed on the other end of the main pull rod, which is provided with the external thread, in a screw-thread fit manner. According to the scheme, the problems that in the prior art, in the plunger pump cylinder sleeve maintenance process, maintenance is difficult, pump parts are prone to being damaged, and labor intensity is large are solved.

Description

Technical Field

[0001] The utility model relates to a plunger pump cylinder sleeve disassembly tool and belongs to the technical field of plunger pump maintenance. Background Art

[0002] At present, due to the high pressure and large displacement operation of plunger pumps, it is necessary to remove the cylinder liner for inspection and maintenance when replacing the main stuffing or the sealing end face is pressure-punctured. However, since there is no special tool for disassembling the cylinder liner when the plunger pump leaves the factory, the hydraulic end pump head and stuffing box can only be disassembled during disassembly, which is not only labor-intensive and inefficient, but also prone to safety hazards in a small space. At the same time, the disassembly and assembly of the pump head is also prone to damage to parts.

[0003] The existing problems in repairing the cylinder liner of the plunger pump are: first, due to design defects, there are no special supporting tools, and maintenance can only be carried out by disassembling the hydraulic end stuffing box and the pump head; second, when disassembling the hydraulic end stuffing box and the pump head, lifting equipment is required, which is time-consuming, material-consuming, labor-intensive and also poses a safety hazard; third, the pump parts are easily damaged during the disassembly process, and the labor intensity is high. Utility Model Content

[0004] The utility model aims to provide a plunger pump cylinder sleeve disassembly tool to solve the problems of difficult maintenance, easy damage of pump parts and high labor intensity in the prior art during the maintenance of the plunger pump cylinder sleeve.

[0005] To achieve the above purpose, the solution of the utility model includes:

[0006] The utility model discloses a plunger pump cylinder sleeve disassembly tool, comprising a rod and an expansion part fixed at one end of the rod, the expansion part is used to extend into the cylinder sleeve to be disassembled and to be tightly fitted with the inner wall of the cylinder sleeve through expansion; an expansion seam is axially opened on the outer wall of the expansion part from the lower end, a main pull rod is passed through the inner hole of the rod and the expansion part along the axial direction, the main pull rod is provided with an expansion structure for expanding the expansion part at one end of the expansion part, and a stopping structure for stopping with the end face of the rod is screwed on the other end of the main pull rod with an external thread.

[0007] By rotating the stopping structure on one end of the main pull rod, the axial force formed by the rotation of the thread is used to make the expansion part contact with the disassembled component to generate an external expansion force to remove the component. The main pull rod moves axially to push the rod part to axially squeeze the expansion part so that the expansion structure enters the inner side of the expansion part. Since the outer diameter of the expansion structure is larger than the inner diameter of the expansion part, the outer diameter of the expansion part becomes larger and thus gets stuck to the inner wall of the cylinder liner. The cylinder liner is removed by external force to complete the disassembly.

[0008] Furthermore, the expansion structure is in a truncated cone shape, the upper bottom of which is smaller than the inner hole of the expansion part, and the lower bottom of which is larger than the inner hole of the expansion part.

[0009] The upper bottom of the support structure is smaller than the inner hole of the expansion part, which makes it easy to align the support structure with the expansion part and squeeze it into the inner wall of the expansion part at the beginning. The lower bottom is larger than the inner hole of the expansion part to prevent the support structure from slipping out from one end of the expansion part under the pulling force of external force.

[0010] The stopping structure comprises an adjusting nut and a gasket, and the adjusting nut is stopped by the end surface of the rod through the gasket.

[0011] The stopping structure adopts a nut and a gasket structure. On the one hand, it is convenient for disassembling the various components of the disassembly tool. On the other hand, it requires the use of the axial force generated by the rotation of the thread to make the tool contact with the disassembled parts to generate an external expansion force to remove the parts.

[0012] Furthermore, the rod portion comprises a sliding rod, a sliding block is sleeved on the sliding rod, and a stopping portion for the sliding block to collide with is arranged at one end of the sliding rod close to the stopping structure.

[0013] A sliding block is sleeved on the sliding rod, and a stopping part is provided at one end of the sliding block close to the stopping structure. The sliding block is slid on the sliding rod and hits the stopping part, and the stopping part is installed on the main pull rod, so that the impact force of the sliding block is transmitted to the main pull rod. The outward pulling force on the main pull rod drives the expansion part at the lower end to move together, so that the cylinder sleeve is taken out.

[0014] Furthermore, the stopping portion is formed by the lower end surface of the stopping structure.

[0015] Furthermore, an expansion hole is provided at one end of the expansion joint close to the rod portion.

[0016] An expansion hole is provided at one end of the expansion seam close to the middle of the expansion portion, which can effectively prevent the expansion seam of the expansion portion from continuing to extend and crack due to the expansion force of the expansion portion.

[0017] Furthermore, the expansion portion is provided with a tooth pattern for increasing friction on a surface thereof which is used to tightly fit with the inner wall of the cylinder sleeve to be removed.

[0018] A tooth pattern structure is provided at one end of the expansion part close to the expansion seam. The tooth pattern structure is an uneven structure which can increase the relative friction of the expansion structure in contact with the inside of the expansion part, thereby preventing the expansion structure in contact with the inner wall of the expansion part from slipping easily.

[0019] Furthermore, the main pull rod fixes the support structure at a corresponding end through a positioning nut.

[0020] A positioning nut and a gasket for blocking the support structure are arranged at the other end of the main pull rod. The nut fixes the support structure to the main pull rod through the gasket, which is convenient for disassembly.

[0021] Furthermore, the main pull rod fixes the support structure via a protrusion on the circumference of the end portion.

[0022] The other end of the main pull rod is provided with a circumferential protrusion at the end portion, and the method of blocking the support structure by the circumferential protrusion is more secure and not easy to fall off or loosen. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of a plunger pump cylinder sleeve disassembly tool of the utility model;

[0024] In the figure: 1. main pull rod; 2. adjusting nut; 3. gasket; 4. sliding block; 5. handle sliding rod; 6. supporting outer thread cylinder; 7. conical support iron; 8. expansion hole; 9. expansion seam; 10. tooth pattern; 11. gasket. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0026] Embodiment 1:

[0027] like Figure 1 The plunger pump cylinder sleeve disassembly tool shown includes a main pull rod 1, an adjusting nut 2, a gasket 3, a sliding block 4, a handle sliding rod 5 (rod part), a supporting outer threaded tube 6 (expansion part), a conical support iron 7 (opening structure), an expansion hole 8, an expansion seam 9, a threaded groove 10 and a gasket 11. The handle sliding rod 5 includes an inner hole arranged along its axis, the main pull rod 1 is inserted into the inner hole of the handle sliding rod 5, the sliding block 4 is sleeved on the outer peripheral surface of the handle sliding rod 5, the two ends of the main pull rod 1 are provided with threads, the adjusting nut 2 is installed at one end of the main pull rod 1 through the gasket 3, the inner diameter of the gasket 3 is larger than the outer diameter of the main pull rod 1 and smaller than the outer diameter of the handle sliding rod 5, which can ensure that the gasket 3 can be installed on the main pull rod 1 and play a stopping role on the handle sliding rod 5; the supporting outer threaded tube 6 is installed on the main pull rod 1 at one end of the handle sliding rod 5 and away from the adjusting nut 2, wherein the handle sliding The inner diameter of the striker 5 should be larger than the inner diameter of the supporting outer cylinder 6 and smaller than the outer diameter of the supporting outer cylinder 6. The conical support iron 7 is installed on the main pull rod 1 at the end of the supporting outer cylinder 6 away from the adjusting nut 2. The positioning nut fixes the conical support iron 7 to the other end of the main pull rod 1 through the gasket 11. The inner diameter of the gasket 11 should be larger than the outer diameter of the main pull rod 1 and smaller than the outer diameter of the conical support iron 7. It can ensure that the gasket 11 can be installed on the main pull rod 1 and fix the conical support iron 7. The upper bottom of the conical support iron 7 is smaller than the inner diameter of the supporting outer cylinder 6, and the lower bottom is larger than the inner diameter of the supporting outer cylinder 6.

[0028] The supporting outer cylinder 6 is hollow, similar to the expansion tube of the expansion screw, and the expansion slot 9 with symmetrical disconnection openings is used to support the axial expansion of the supporting outer cylinder 6. An expansion hole 8 is provided at the end of the expansion slot 9 away from the positioning nut, and a tooth pattern 10 is provided at the end of the supporting outer cylinder 6 close to the positioning nut. Since the outer diameter of the conical support iron 7 is larger than the inner diameter of the supporting outer cylinder 6, the conical support iron 7 enters the inner side of the supporting outer cylinder 6 to give the supporting outer cylinder 6 an axial force to expand outward, thereby jamming the parts.

[0029] When in use, push the end of the tool with the conical support iron 7 from the front end of the pump head into the cylinder sleeve, rotate the adjusting nut 2 on the main pull rod 1, and use the axial force formed by the rotation of the thread to make the tool contact with the disassembled parts to generate an external expansion force to take out the parts. The main pull rod 1 moves axially to push the handle sliding rod 5 to axially squeeze the supporting outer cylinder 6 so that the conical support iron 7 enters the inner side of the supporting outer cylinder 6. Since the outer diameter of the conical support iron 7 is larger than the inner diameter of the supporting outer cylinder 6, the outer diameter of the supporting outer cylinder 6 becomes larger and thus jams the inner wall of the cylinder sleeve. By sliding the sliding block 4 axially on the handle sliding rod 5 along the cylinder diameter direction toward the gasket 3, the cylinder sleeve is brought out along with the axial displacement of the tool to complete the removal.

[0030] In this embodiment, the sliding block 4 is used to impact the gasket 3, so that the impact force of the sliding block 4 is transmitted to the main pull rod 1. The outward pulling force on the main pull rod 1 drives the supporting outer tooth cylinder 6 at the lower end to move together, so that the cylinder sleeve is taken out.

[0031] In this embodiment, the sliding block 4 is used to impact the cylinder liner to remove it. In addition, other methods can also be used, such as using a lever to pry the gasket 3 to pry the tool out, etc. The utility model does not limit the method of pushing the disassembly tool into the cylinder liner and then pulling it out.

[0032] Compared with the prior art, the application of the utility model to the maintenance of plunger pumps has changed the maintenance process. There is no need to disassemble the stuffing box and the pump head of the hydraulic end, and the plunger pump cylinder sleeve can be non-destructively repaired. This not only avoids the safety hazards during the disassembly process, but also greatly reduces the labor intensity and realizes fast and non-destructive disassembly and assembly.

[0033] Embodiment 2:

[0034] The difference between Example 2 and Example 1 is that the handle sliding rod 5 and the supporting outer cylinder 6 are an integrated structure, and the other parts and working principles are the same as those of Example 1, which will not be repeated here.

[0035] Embodiment 3:

[0036] The difference between Example 3 and Example 1 is that one end of the main pull rod 1 is a threaded structure, and the other end is a protrusion on the circumference of the end. The adjusting nut 2 is installed at one end of the threaded structure through the gasket 3, and the other end is used to fix the conical support iron 7. The method of fixing the conical support iron 7 through the protrusion on the circumference is more secure and not easy to fall off or loosen. During installation, follow the installation method from bottom to top. First, install the conical support iron 7 on the main pull rod 1 to the protrusion on the circumference of the end. Next, install the supporting outer threaded cylinder 6, the handle sliding rod 5, the sliding block 4, the gasket 3 and the adjusting nut 2 on the main pull rod 1 in turn. Finally, tighten the other components by adjusting the adjusting nut 2. The other parts and working principles are the same as those in Example 1 and will not be repeated here.

Claims

1. A plunger pump cylinder sleeve removal tool, characterized in that: It includes a rod portion and an expansion portion fixed at one end of the rod portion, wherein the expansion portion is used to extend into the cylinder liner to be disassembled and to be tightly fitted with the inner wall of the cylinder liner through expansion; an expansion seam is axially opened on the outer wall of the expansion portion from the lower end, and a main pull rod is passed through the axial inner hole of the rod portion and the expansion portion, and the main pull rod is provided with an expansion structure for expanding the expansion portion at one end of the expansion portion, and a stopping structure for stopping with the end face of the rod portion is screwed on the other end of the main pull rod with an external thread.

2. The plunger pump cylinder liner removal tool according to claim 1, characterized in that: The support structure is in a truncated cone shape, the upper bottom of which is smaller than the inner hole of the expansion part, and the lower bottom of which is larger than the inner hole of the expansion part.

3. The plunger pump cylinder liner removal tool according to claim 1, characterized in that: The stopping structure comprises an adjusting nut and a gasket, and the adjusting nut is stopped by the end surface of the rod through the gasket.

4. The plunger pump cylinder liner removal tool according to claim 1, characterized in that: The rod portion comprises a sliding rod, a sliding block is sleeved on the sliding rod, and a stopping portion for the sliding block to hit is arranged at one end of the sliding rod close to the stopping structure.

5. The plunger pump cylinder liner removal tool according to claim 4, characterized in that: The stopping portion is formed by the lower end surface of the stopping structure.

6. The plunger pump cylinder liner removal tool according to claim 1, characterized in that: An expansion hole is arranged at one end of the expansion joint close to the rod portion.

7. The plunger pump cylinder liner removal tool according to claim 1, characterized in that: The surface of the expansion portion, which is used to tightly fit with the inner wall of the cylinder sleeve to be removed, is provided with tooth patterns for increasing friction.

8. The plunger pump cylinder liner removal tool according to claim 1, characterized in that: The main pull rod fixes the support structure at the corresponding end through a positioning nut.

9. The plunger pump cylinder liner removal tool according to claim 1, characterized in that: The main pull rod fixes the support structure via protrusions on the circumference of the end portion.

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