Hydraulic quick assembly / disassembly tool for plunger pump and assembly / disassembly method

Abstract

The hydraulic quick assembly / disassembly tool for the plunger pump comprises a hollow hydraulic jack, the middle of the hollow hydraulic jack is connected with a lead screw in a penetrating mode through threads, a liquid inlet is formed in the hollow hydraulic jack, and the outer wall of the hollow hydraulic jack is connected with a base; the tool disclosed by the invention has the functions of sucking / discharging the plug, the plunger and the plunger packing sealing group, so that the specification of the tool is unified; the portable manual hydraulic pump serves as power of the tool, and the hollow jack drives the lead screw to disassemble and assemble the plunger packing sealing set, the plunger, the suction plug and the discharge plug. According to the hydraulic quick assembly / disassembly method for the plunger pump, hydraulic pressure in the hollow hydraulic jack is controlled to drive the lead screw to move, and disassembly and assembly of the plug and the plunger are achieved; the device is simple to operate, high in assembly / disassembly efficiency, time-saving, labor-saving, quick to disassemble, safe, reliable and good in stability.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum mechanical equipment, and in particular relates to a hydraulic quick assembly / disassembly tool for a plunger pump, and also relates to a hydraulic quick assembly method for a plunger pump and a hydraulic quick disassembly method for a plunger pump. Background Art

[0002] The plunger pump is the main equipment used in fracturing, sand addition, and fracturing acidizing operations in shale gas, tight oil and gas reservoirs, and low-permeability oil and gas reservoirs. It has the characteristics of high power, high pressure, and large displacement, but it also leads to a limited life of its wearing parts and frequent replacement.

[0003] The schematic diagram of the conventional plunger pump is shown in Figure 1 It can be seen that due to the limitation of the main structure of the plunger pump, the process of replacing wearing parts involves the disassembly and assembly of related parts such as the suction plug. For the disassembly and assembly of wearing parts such as the suction / discharge plug and the plunger, conventional disassembly and assembly tools of various types, functions and specifications such as plunger threaded / hammer type and suction / discharge plug hammer type are generally provided. In the field application of the above-mentioned disassembly and assembly tools for plunger pumps, it is generally reflected that due to erosion and inclusions such as fracturing fluid, the mating surfaces are adhered, the disassembly and assembly strength is high, it is time-consuming and labor-intensive, and a variety of tools are provided, the operation is cumbersome, and the disassembly and assembly efficiency is low. Summary of the invention

[0004] The first object of the present invention is to provide a hydraulic quick assembly / disassembly tool for a plunger pump, which solves the problem that the existing plunger pump disassembly tool needs to design the size of the disassembly tool according to the specifications of the disassembly parts, resulting in a wide variety of disassembly tools.

[0005] The second object of the present invention is to provide a hydraulic quick-installation method for a plunger pump, which solves the problems of complicated operation and low installation efficiency of the existing method.

[0006] The third object of the present invention is to provide a hydraulic quick-disassembly method for a plunger pump, which solves the problems of complicated operation and low disassembly efficiency of the existing method.

[0007] The first technical solution adopted by the present invention is a hydraulic quick assembly / disassembly tool for a plunger pump, comprising a hollow hydraulic jack, a screw threaded through the middle of the hollow hydraulic jack, a liquid inlet provided on the hollow hydraulic jack, and an outer wall of the hollow hydraulic jack connected to a base.

[0008] The present invention is also characterized in that:

[0009] The screw is located at the active end surface of the hollow hydraulic jack and is connected to a nut through a thread.

[0010] The hollow hydraulic jack includes a jack housing and a jack piston located in the jack housing. One end of the jack piston extends outside the jack housing as the movable end of the hollow hydraulic jack. A liquid inlet is provided on the jack housing away from the movable end. A quick-connect connector is connected to the liquid inlet on the jack housing. The jack housing is connected to the base by bolts. The lead screw passes through the jack housing and is connected to the jack piston by threads. The end face of the jack piston contacts the connecting nut.

[0011] The outer wall of the jack housing is connected to a handle, and the handle passes through the base.

[0012] A connecting thread is provided at one end of the lead screw, and a mounting hole is provided at the other end.

[0013] The base includes a flange I, which is connected to a gland by bolts, and a base cavity is formed between the flange I and the middle of the gland. Bolt holes are provided on the flange I, and the flange I is connected to a hollow hydraulic jack by bolts passing through the bolt holes. A fastening thread is provided on the outer wall of one end of the flange I.

[0014] A long groove I is provided on the side wall of the flange I.

[0015] The pressure cover includes a flange II, the flange I and the flange II are connected by flange connecting bolts, and a base cavity is formed in the middle. A long groove II is opened on the side wall of the flange II, and the long groove I is connected to the long groove II.

[0016] The second technical solution adopted by the present invention is a hydraulic quick-installation method for a plunger pump, using a hydraulic quick-release tool for a plunger pump, which is specifically implemented according to the following steps:

[0017] When installing the plug and plunger, fix the base, connect one end of the screw corresponding to the movable end of the hollow hydraulic jack to the threaded hole in the middle of the plug and plunger, connect a portable hand-cranked hydraulic pump to the liquid inlet of the hollow hydraulic jack, flush liquid into the hollow hydraulic jack through the portable hand-cranked hydraulic pump, drive the movable end and the screw to move to the installation location through the hydraulic pressure, and complete the installation of the plug and plunger through the screw.

[0018] The third technical solution adopted by the present invention is a hydraulic quick disassembly method for a plunger pump, using a hydraulic quick assembly / disassembly tool for a plunger pump, which is specifically implemented according to the following steps:

[0019] When removing the plug and plunger, fix the base, connect one end of the screw corresponding to the fixed end of the hollow hydraulic jack to the threaded hole in the middle of the plug and plunger, connect a portable hand-cranked hydraulic pump to the liquid inlet of the hollow hydraulic jack, flush liquid into the hollow hydraulic jack through the portable hand-cranked hydraulic pump, drive the movable end and the screw to move away from the installation place through the hydraulic pressure, and pull out the plug and plunger through the screw.

[0020] The beneficial effects of the present invention are:

[0021] The hydraulic quick assembly / disassembly tool for the plunger pump of the present invention has the function of disassembling the suction / discharge plug, the plunger and the plunger packing seal group, reduces the number of tools and unifies the tool specifications; and the tool uses a portable manual hydraulic pump as power, and drives a lead screw to disassemble and assemble the plunger packing seal group, the plunger, the suction plug and the discharge plug through a hollow jack; the hydraulic quick assembly / disassembly method for the plunger pump of the present invention is simple to operate, has high assembly / disassembly efficiency, saves time and effort, is fast to assemble and disassemble, is safe and reliable, and has good stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the hydraulic end structure of a conventional plunger pump;

[0023] Figure 2 A schematic structural diagram of a hydraulic quick assembly / disassembly tool for a plunger pump according to the present invention;

[0024] Figure 3 A schematic diagram of the structure of the hollow hydraulic jack in the present invention;

[0025] Figure 4 A schematic diagram of the lead screw structure in the present invention;

[0026] Figure 5 A schematic diagram of the base structure in the present invention;

[0027] Figure 6 A schematic structural diagram of a simple disassembly tool for a plunger packing seal connected with a hydraulic quick assembly / disassembly tool for a plunger pump of the present invention;

[0028] Figure 7 It is a schematic diagram of installing a suction plug with a hydraulic quick assembly / disassembly tool for a plunger pump of the present invention;

[0029] Figure 8 It is a schematic diagram of disassembling a discharge plug of a plunger pump using a hydraulic quick assembly / disassembly tool of the present invention;

[0030] Fig. 9 It is a schematic diagram of removing the suction plug of the plunger pump using the hydraulic quick assembly / disassembly tool of the present invention;

[0031] Fig.10 It is a schematic diagram of disassembling the plunger of the plunger pump using the hydraulic quick assembly / disassembly tool of the present invention;

[0032] Fig.11 It is a schematic diagram of disassembling a plunger packing seal assembly using a hydraulic quick assembly / disassembly tool for a plunger pump of the present invention;

[0033] Fig.12 It is a schematic diagram of installing a plunger packing seal assembly using a hydraulic quick assembly / disassembly tool for a plunger pump of the present invention.

[0034] In the figure, 1. base, 11. fastening thread, 12. base cavity, 13. flange I, 14. long groove I, 15. bolt hole, 2. hollow hydraulic jack, 21. jack piston, 22. handle, 23. quick plug connector, 24. jack housing, 3. gland, 31. flange II, 32. long groove II, 33. quick plug connector mounting hole, 4. screw, 41. connecting thread, 42. mounting hole, 5. nut, 6. packing seal group simple tool, 61. flange, 62. boss I, 63. threaded connection hole, 64. boss II, 65. hexagon, 7. flange connection bolt. DETAILED DESCRIPTION

[0035] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Example 1

[0037] The hydraulic quick assembly / disassembly tool for the plunger pump of the present invention is as follows: Figure 2 As shown, it includes a hollow hydraulic jack 2, a screw 4 is connected to the middle of the hollow hydraulic jack 2 through a thread, a liquid inlet is provided on the hollow hydraulic jack 2, and the outer wall of the hollow hydraulic jack 2 is connected to the base 1. The screw 4 can move with the hollow hydraulic jack 2. When in use, the base 1 is fixed, and then the outer shell of the hollow hydraulic jack 2 is fixed. Under the action of hydraulic pressure, the internal movable end drives the screw 4 to move. Since the screw 4 is connected to the plug or plunger or packing seal group simple tool, when the hollow hydraulic jack 2 moves with the internal piston, it drives the screw 4 to move, and then the plug or plunger or packing seal group simple tool is pushed in or pulled out, so as to achieve rapid assembly / disassembly.

[0038] Among them, the screw 4 is connected to the nut 5 through a thread at the active end surface of the hollow hydraulic jack 2, and the active end of the hollow hydraulic jack 2 is fixed in relative position by the nut 5, so that the active end of the hollow hydraulic jack 2 moves synchronously with the nut 5 and the screw 4.

[0039] like Figure 3As shown, the hollow hydraulic jack 2 includes a jack housing 24 and a jack piston 21 located in the jack housing 24. One end of the jack piston 21 extends to the outside of the jack housing 24 as the movable end of the hollow hydraulic jack 2. A liquid inlet is provided on the jack housing 24 away from the movable end. The liquid inlet on the jack housing 24 is connected to a quick-connect connector 23. The jack housing 24 is connected to the base 1 through bolts. The lead screw 4 passes through the jack housing 24 and is connected to the jack piston 21 through threads. The end face of the jack piston 21 contacts the connecting nut 5. The quick-connect connector 23 is connected to a portable hand-cranked hydraulic pump. The portable hand-cranked hydraulic pump presses into the jack housing 24 through the quick-connect connector 23 to push the jack piston 21 to move. The lead screw 4 is connected to the jack piston 21. The jack piston 21 can drive the lead screw 4 to move under the action of pressure, so as to realize the simple tool pushing or pulling out of the plug, plunger or packing sealing group.

[0040] The outer wall of the jack housing 24 is connected to a handle 22, and the handle 22 passes through the base 1. The handle 22 is convenient for installation or removal of the hollow hydraulic jack 2. The handle 22 passes through the base 1 and is moved during the overall structure.

[0041] like Figure 4 As shown, a connecting thread 41 is provided at one end of the lead screw 4, and a mounting hole 42 is provided at the other end. The lead screw 4 is connected to the suction / discharge plug or plunger to be removed through the connecting thread 41. When the lead screw 4 is rotated to tighten / remove, a round rod is passed through the mounting hole 42 for rotation.

[0042] like Figure 5 As shown, the base 1 includes a flange I13, which is connected to the gland 3 by bolts, and a base cavity 12 is formed in the middle of the flange I13 and the gland 3. A bolt hole 15 is provided on the flange I13, and the flange I13 is connected to the hollow hydraulic jack 2 by bolts passing through the bolt hole 15. A fastening thread 11 is provided on the outer wall of one end of the flange I13, and the base 1 is threadedly connected and fixed to the suction / discharge cylinder head of the hydraulic cylinder by the fastening thread 11. The base 1 is tightened and disassembled by passing a round rod through the mounting hole 42.

[0043] The base cavity 12 and the outer circle of the hollow hydraulic jack 2 are matched with a small gap, which plays a role in matching and overall installation of a certain length.

[0044] The side wall of the flange 113 is provided with an elongated groove 114, and the handle 22 passes through the elongated groove 114 for easy carrying.

[0045] like Figure 5As shown, the pressure cover 3 includes a flange II31, and the flange I13 is connected to the flange II31 by flange connecting bolts 7, and a base cavity 12 is formed in the middle. The side wall of the flange II31 is provided with a long groove II32, and the long groove I14 is communicated with the long groove II32. The hollow hydraulic jack 2 is connected to the base cavity 12, and the jack housing 24 can be fixed by the flange II31, so that the jack piston 21 can move relative to the jack housing 24. A quick-connect fitting installation hole 33 is provided on the flange I13, and the jack nozzle quick-connect fitting 23 is installed on the hollow hydraulic jack 2 through the quick-connect fitting installation hole 33 of the pressure cover 3.

[0046] like Figure 6 The figure shows the structure of the simple tool 6 for packing seal group, flange 61, boss II64 and boss I62 are respectively arranged on both sides of the flange 61, which respectively cooperate with the inner cavity of the pressure ring at both ends of the packing seal group, the boss II64 is connected with the hexagonal 65, the boss I62 is provided with a threaded connection hole 63, the hexagonal 65 is used for connecting tools such as wrenches when tightening or disassembling; the threaded connection hole 63 in the boss I62 is connected to the connecting thread 41 of the screw 4.

[0047] Example 2

[0048] like Figure 7 As shown, the hydraulic quick-installation method for the plunger pump uses a hydraulic quick-release tool for the plunger pump. The base 1 is fixed on the thread of the hydraulic cylinder suction / discharge cylinder head and tightened. The base 1 can fix the jack housing 24, so that the jack piston 21 can move freely. The direction of the jack piston 21 is rightward, and the jack handle 22 is installed to align with the long groove I14 of the base 1. The jack nozzle quick-plug connector 23 is installed on the hollow hydraulic jack 2 through the bolt hole 15 of the base 1. The hollow part of the hollow hydraulic jack 2 is provided with a screw 4. The connecting thread 41 at one end of the screw 4 is connected to the suction / discharge plug or plunger that needs to be disassembled. The nut 5 is matched with the end face of the jack piston 21. The nut 5 is tightened manually, and the nozzle quick-plug connector 23 of the hollow hydraulic jack 2 is connected to a portable hand-cranked hydraulic pump;

[0049] When installing the plug and plunger, use a wooden stick or a copper hammer to tap the pre-installed suction / discharge plug or plunger, connect one end of the lead screw 4 corresponding to the movable end of the hollow hydraulic jack 2 to the threaded hole in the middle of the plug and plunger, connect a portable hand-cranked hydraulic pump to the liquid inlet of the hollow hydraulic jack 2, and use the portable hand-cranked hydraulic pump to flush liquid into the hollow hydraulic jack 2, and drive the movable end and lead screw 4 to move to the place to be installed through hydraulic pressure ( Figure 7 Move to the left in the middle), complete the installation of the plug and plunger through the screw 4, relieve the pressure of the portable hand-cranked hydraulic pump, rotate the screw 4 to remove the screw from the suction / discharge plug or plunger, and remove the base 1, the air hydraulic jack 2, the screw 4, the pressure cover 3, etc. as a whole.

[0050] Example 3

[0051] like Figure 8 , Fig. 9 As shown, the plunger pump uses a hydraulic quick-release method, and a hydraulic quick-install / disassemble tool for the plunger pump is used. The base 1 is fixed to the threads of the hydraulic cylinder suction / discharge cylinder cover and tightened. The base 1 can fix the jack housing 24, allowing the jack piston 21 to move freely.

[0052] When removing the plug and plunger, fix the base 1, connect one end of the screw 4 corresponding to the fixed end of the hollow hydraulic jack 2 to the threaded hole in the middle part of the plug and plunger, connect the portable hand-cranked hydraulic pump to the liquid inlet of the hollow hydraulic jack 2, and the portable hand-cranked hydraulic pump will work by pressurizing. The jack piston 21 of the hollow hydraulic jack 2 drives the suction / discharge plug or plunger to be removed to the right through the nut 5 and the screw 4, until the suction / discharge plug or plunger is moved out of its mating surface and loosened, stop the hand-cranked pump from pressing, relieve the pressure of the portable hand-cranked hydraulic pump, remove the oil nozzle quick-connect connector 23 of the hollow hydraulic jack 2, and remove the hollow hydraulic jack 2, the screw 4, the nut 5, and the removed suction / discharge plug and plunger together to the outside of the pump body.

[0053] Combination Fig.11 , Fig.12 The installation steps and working steps of the hydraulic quick assembly / disassembly tool for the plunger pump of the present invention for replacing the packing seal group are:

[0054] The base 1 is tightened at the thread of the cylinder suction / discharge cylinder head by passing a round rod through the bolt hole 15; the nut 5 is installed on the screw 4; the screw 4 is set in the hollow part of the hollow hydraulic jack 2, wherein the connecting thread 41 of the jack piston 21 and the screw 4 are in the same direction, and the nut 5 is in contact with the jack piston 21; the connecting thread 41 of the screw 4 and the threaded connecting hole 63 of the packing seal group simple tool 6 are fixed with a wrench hexagon 65 or tightened manually; the assembled hollow hydraulic jack 2, screw 4, nut 5 and packing seal group simple tool 6 are installed on the base 1 as a whole, and the boss I62 of the packing seal group simple tool 6 is matched with the inner circle of the packing seal group gasket ring ; The outer circle of the hollow hydraulic jack 2 cooperates with the base cavity 12, the direction of the jack piston 21 is to the left, and the jack handle 22 is installed to align with the long groove I14 of the base 1; the base 1 is provided with a flange I13, which cooperates with the flange II31 of the gland 3, and is connected and fastened by bolts 7 to achieve the installation of the gland 3; the base 1 is provided with a long groove I14, and the gland 3 is provided with a long groove II32, which cooperates with the handle 22 of the hollow hydraulic jack 2; the jack nozzle quick-connect connector 23 is installed on the hollow hydraulic jack 2 through the quick-connect connector installation hole 33 of the gland 3; the nozzle quick-connect connector 23 of the hollow hydraulic jack 2 is connected to a portable hand-cranked hydraulic pump. When the portable hand-cranked hydraulic pump is working, the jack piston 21 of the hollow hydraulic jack 2 drives the simple tool 6 of the packing seal group to move to the left through the nut 5 and the screw 4, so as to achieve the simple tool disassembly of the packing seal group. Depressurize the portable hand-cranked hydraulic pump, fix the rotating screw 4, remove the simple tool 6 of the packing seal group, remove the packing seal group for replacement; remove the gland 3 and bolts 7, and remove the hollow hydraulic jack 2, screw 4, and nut 5.

[0055] like Fig.12As shown, the hollow part of the hollow hydraulic jack 2 passes through the screw 4, and the connecting thread 41 of the screw 4 is consistent with the direction of the jack piston 21, both of which are rightward; the hollow hydraulic jack 2, together with the assembled screw 4, is installed into the base cavity 12 of the base 1, the handle 22 passes through the long groove I14, and the jack piston 21 is directed to the right; the nut 5 is installed on the connecting thread I of the screw 4, and the nut 5 is in contact with the jack piston 21; the packing seal group to be installed is passed through the screw 4 on the side of the connecting thread 41 of the screw 4, and the simple tool 6 of the packing seal group is installed on the connecting thread 41; the inner circle of the left side gasket ring of the installed packing seal group is aligned with the convex part of the simple tool 6 of the packing seal group The packing seal group to be installed is initially pre-tightened on the packing box through the screw 4 and the right side of the flange 61 to ensure that the packing seal group is concentric with the packing box; the oil nozzle quick-plug connector 23 of the hollow hydraulic jack 2 is connected to the portable hand-cranked hydraulic pump; the portable hand-cranked hydraulic pump works by pressure, and the jack piston 21 of the hollow hydraulic jack 2 drives the packing seal group to be installed to move to the right by a certain stroke through the nut 5 and the screw 4, so as to realize the installation of the plunger packing seal group; the portable hand-cranked hydraulic pump releases pressure, fixes the rotating screw 4, and removes the simple tool 6 of the packing seal group; remove the base 1, the hollow hydraulic jack 2, the pressure cover 3, the screw 4, the nut 5, etc. as a whole.

[0056] At this point, all operating steps of the plunger packing seal of the hydraulic quick assembly / disassembly tool for the plunger pump of the present invention are completed.

[0057] Through the above method, the important features and advantages of the hydraulic quick assembly / disassembly tool for the plunger pump of the present invention are: 1) it has the function of disassembling and assembling the plunger, plunger packing seal group, suction plug and discharge plug, which reduces the types of tools and unifies the tool specifications; 2) the tool is powered by a portable manual hydraulic pump, and drives the lead screw to disassemble and assemble the plunger packing seal group, plunger, suction plug and discharge plug through a hollow jack. The operation is simple, time-saving, labor-saving, fast disassembly and assembly, and it is safe, reliable and stable.

Claims

1. Hydraulic quick assembly / disassembly tool for plunger pump, characterized in that: It comprises a hollow hydraulic jack (2), wherein a threaded connecting screw (4) penetrates through the middle of the hollow hydraulic jack (2), a liquid inlet is provided on the hollow hydraulic jack (2), and the outer wall of the hollow hydraulic jack (2) is connected to a base (1).

2. The hydraulic quick assembly / disassembly tool for a plunger pump according to claim 1, characterized in that: The lead screw (4) is connected to a nut (5) via a thread at the movable end surface of the hollow hydraulic jack (2).

3. The hydraulic quick assembly / disassembly tool for a plunger pump according to claim 4, characterized in that: The hollow hydraulic jack (2) comprises a jack housing (24) and a jack piston (21) located in the jack housing (24); one end of the jack piston (21) extends outside the jack housing (24) to serve as a movable end of the hollow hydraulic jack (2); a liquid inlet is provided on the jack housing (24) away from the movable end; a quick-connect connector (23) is connected to the liquid inlet on the jack housing (24); the jack housing (24) is connected to the base (1) by bolts; the lead screw (4) passes through the jack housing (24) and is connected to the jack piston (21) by threads; and the end surface of the jack piston (21) contacts the connecting nut (5).

4. The hydraulic quick assembly / disassembly tool for a plunger pump according to claim 3, characterized in that: The outer wall of the jack housing (24) is connected to a handle (22), and the handle (22) passes through the base (1).

5. The hydraulic quick assembly / disassembly tool for a plunger pump according to claim 1, characterized in that: The lead screw (4) has a connecting thread (41) at one end and a mounting hole (42) at the other end.

6. The hydraulic quick assembly / disassembly tool for a plunger pump according to claim 1, characterized in that: The base (1) includes a flange I (13), which is connected to a gland (3) by bolts, and a base cavity (12) is formed in the middle of the flange I (13) and the gland (3). A bolt hole (15) is provided on the flange I (13), and the flange I (13) is connected to a hollow hydraulic jack (2) by bolts passing through the bolt hole (15). A fastening thread (11) is provided on the outer wall of one end of the flange I (13).

7. The hydraulic quick assembly / disassembly tool for a plunger pump according to claim 6, characterized in that: The side wall of the flange I (13) is provided with an elongated groove I (14).

8. The hydraulic quick assembly / disassembly tool for a plunger pump according to claim 7, characterized in that: The gland (3) comprises a flange II (31), the flange I (13) and the flange II (31) are connected by flange connecting bolts (7), and a base cavity (12) is formed in the middle, a long groove II (32) is provided on the side wall of the flange II (31), and the long groove I (14) is communicated with the long groove II (32).

9. A hydraulic quick-installation method for a plunger pump, characterized in that: The use of the hydraulic quick-release tool for a plunger pump according to any one of claims 1 to 8 is specifically implemented according to the following steps: When installing the plug and the plunger, the base (1) is fixed, one end of the lead screw (4) corresponding to the movable end of the hollow hydraulic jack (2) is connected to the threaded hole in the middle of the plug and the plunger, a portable hand-cranked hydraulic pump is connected to the liquid inlet of the hollow hydraulic jack (2), liquid is injected into the hollow hydraulic jack (2) through the portable hand-cranked hydraulic pump, the movable end and the lead screw (4) are driven by hydraulic pressure to move to the installation position, and the plug and the plunger are installed through the lead screw (4).

10. A hydraulic quick-release method for a plunger pump, characterized in that: The use of the hydraulic quick assembly / disassembly tool for a plunger pump according to any one of claims 1 to 8 is specifically implemented according to the following steps: When removing the plug and the plunger, the base (1) is fixed, one end of the lead screw (4) corresponding to the fixed end of the hollow hydraulic jack (2) is connected to the threaded hole in the middle of the plug and the plunger, and a portable hand-cranked hydraulic pump is connected to the liquid inlet of the hollow hydraulic jack (2). Liquid is injected into the hollow hydraulic jack (2) through the portable hand-cranked hydraulic pump, and the movable end and the lead screw (4) are driven by hydraulic pressure to move in a direction away from the installation position, and the plug and the plunger are pulled out through the lead screw (4).

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