Disassembling and assembling tool capable of adjusting torque for drilling pump and working method

Abstract

The torque-adjustable dismounting tool for the drilling pump comprises a shell, a circular through hole is formed in the shell, a rotating shaft coaxial with the through hole is arranged in the through hole, rotating blades and fixed blades are arranged between the surface of the rotating shaft and the inner wall of the through hole, the rotating blades are fixedly connected with the rotating shaft, and the fixed blades are fixedly connected with the shell. The rotating blade and the fixed blade divide the portion between the surface of the rotating shaft and the inner wall of the through hole into two cavities, the two ends of the rotating shaft and the two ends of the shell are jointly connected with bearing end covers, one end of the rotating shaft stretches out of the bearing end cover on the corresponding side and then is fixedly connected with a tightening sleeve, the shell is further provided with a tightening tool oil port and an oil discharging port, and the shell is further provided with a torque indicating mechanism. The problem that in the prior art, tightening is conducted through manual hammering of a sledge hammer, and follow-up loosening can be caused due to the fact that the tightening torque is not standard is solved. The invention further discloses a working method of the dismounting tool capable of adjusting the torque for the drilling pump.

Description

Technical Field

[0001] The invention belongs to the technical field of oil drilling and repairing equipment, and relates to a torque-adjustable disassembly and assembly tool for a drilling pump; the invention also relates to a working method of the disassembly and assembly tool. Background Art

[0002] When inspecting or replacing wearing parts of oilfield drilling pumps, the hydraulic end often needs to be disassembled. The flange on the product needs to be hammered during disassembly and installation, which is very labor-intensive for workers. In addition, the product will be damaged by hammering after multiple disassembly and installation.

[0003] When installing the valve cover on the hydraulic cylinder of the drilling pump, a certain tightening torque is required according to strict requirements to ensure that the valve cover of the drilling pump will not loosen during operation. The common method is to tighten it by hammering with a sledgehammer, and whether the tightening torque is also judged by experience. This method is not standardized. If the torque requirement is not met, the valve cover of the drilling pump is prone to loosening due to mechanical vibration during the later operation, which will cause quality problems. In severe cases, quality accidents will occur and the labor intensity of workers is high when tightening it by hammering with a sledgehammer. Summary of the invention

[0004] The purpose of the present invention is to provide a torque-adjustable disassembly and assembly tool for a drilling pump, which solves the problem in the prior art that tightening is performed by hammering with a manual sledgehammer and non-standard tightening torque may cause subsequent loosening.

[0005] Another object of the present invention is to provide a working method of a torque-adjustable disassembly and assembly tool for a drilling pump.

[0006] The technical solution adopted by the present invention is a torque-adjustable disassembly and assembly tool for a drilling pump, comprising a shell, a circular through hole being opened in the shell, a rotating shaft coaxial with the through hole being arranged in the through hole, rotating blades and fixed blades being arranged between the rotating shaft surface and the inner wall of the through hole, the rotating blades being fixedly connected to the rotating shaft, the fixed blades being fixedly connected to the shell, the rotating blades and the fixed blades dividing the space between the rotating shaft surface and the inner wall of the through hole into two chambers, the rotating shaft and the shell are also commonly connected with bearing end covers at both ends, a tightening sleeve is fixedly connected to one end of the rotating shaft after extending out of the bearing end cover on the corresponding side, a torsion spring is connected to the other end of the rotating shaft after extending out of the bearing end cover on the corresponding side, the torsion spring is respectively fixed to the bearing end cover on the side on which it is arranged and the rotating shaft, a tightening tool oil port and an oil unloading port are also arranged on the shell, and a torque indicating mechanism is also arranged on the shell.

[0007] The present invention is also characterized in that

[0008] The side of the rotating blade close to the rotating shaft contacts the surface of the rotating shaft and is adapted in shape, the side of the rotating blade facing away from the rotating shaft contacts the inner wall of the through hole and is adapted in shape, the side of the fixed blade close to the inner wall of the through hole contacts the inner wall of the through hole and is adapted in shape, the side of the fixed blade close to the inner wall of the through hole is fixedly connected to the shell, and the side of the fixed blade close to the rotating shaft contacts the surface of the rotating shaft and is adapted in shape.

[0009] The torque indicating mechanism includes a two-step stepped hole arranged on the shell, the diameter of the two-step stepped hole on one side close to the through hole is smaller than the diameter close to one end outside the shell, and the two-step stepped hole on one side close to the through hole is connected with the through hole, and a nut, a disc spring and a calibration nut are arranged in sequence from the inside to the outside of the two-step stepped hole on one end close to the outside of the shell, and the other end of the calibration nut extends out of the shell and is connected with a locking nut, and there is also an indicating rod, which passes through the calibration nut, the disc spring, the nut and one end of the two-step stepped hole close to the through hole and is connected to the nut by a thread, one end of the indicating rod passes through the calibration nut and extends to the outside of the shell and is provided with a scale, the oil unloading port is connected with one end of the two-step stepped hole close to the through hole, and the tightening tool oil port and one end of the two-step stepped hole close to the through hole are connected with the same chamber.

[0010] The rotating shaft and the bearing end cover are rotatably connected through the bearing support. A sealing sleeve is arranged between the rotating shaft and the bearing end cover on the side of the bearing away from the housing, and a dust ring is also sleeved on the outer circumference of the sealing sleeve.

[0011] The rotating blade is fixedly connected to the rotating shaft through bolts and a pin shaft, and the fixed blade is fixedly connected to the housing through bolts a and a pin shaft a.

[0012] The rotating shaft contacts and slides with the fixed blades when the rotating blades rotate, and the rotating blades contact and slide with the inner surface of the shell.

[0013] A sealing device is arranged between the indicating rod and one side of the two-step hole close to the through hole.

[0014] The two ends of the shell body located in the radial direction of the rotating shaft are fixedly connected with reaction arms.

[0015] Another technical solution adopted by the present invention is a working method of a disassembly and assembly tool with adjustable torque for a drilling pump, using the above-mentioned disassembly and assembly tool with adjustable torque for a drilling pump, specifically:

[0016] Tightening mode: connect the tightening sleeve to the cylinder valve cover, fix the other end of the reaction arm to the two ends of the cylinder valve cover to be tightened, connect the hand pump oil filling pipeline to the tightening tool oil port, operate the hand pump to drive the hydraulic oil into the corresponding chamber and then push the rotating blade to rotate. At the same time, the hydraulic oil enters the two-step hole through one end of the two-step hole connecting the chamber, press down the indicator rod together with the nut, compress the disc spring, and slowly extend the indicator rod out of the housing. During the whole process, the operator observes the scale on the indicator rod of the torque indicating mechanism. When the indicator rod begins to extend, the hand pump oil filling should be carried out slowly. When the indicator rod extends and the displayed scale is the target scale, the oil filling stops, knock and remove the reaction arm, remove the tool, and complete the valve cover tightening;

[0017] Disassembly mode: connect the tightening sleeve to the cylinder valve cover, fix the other end of the reaction arm to the two ends of the cylinder valve cover to be disassembled in the opposite direction of the force direction of the reaction arm in the tightening mode, connect the hand pump return oil pipeline to the tightening tool oil port, and the rotating blades rotate in the opposite direction after the hydraulic oil is pumped out. As the hydraulic oil is pumped back, the force applied to the disc spring gradually disappears, and the indicator rod is retracted upward. During the process, the operator observes the scale on the indicator rod, and the oil return of the hand pump return oil pipeline should be carried out slowly. After observing that the cylinder valve cover to be disassembled is rotated a quarter of a turn, the oil return stops, knock to remove the reaction arm, remove the tool, and the valve cover can be disassembled manually.

[0018] The beneficial effects of the present invention are:

[0019] The present invention adjusts the setting and locks according to the torque, ensuring that the tightening torque of the drilling pump disassembly tool matches the tightening torque between the disassembled valve cover or cylinder cover, achieving the beneficial effect of a wide range of applications. Moreover, the operator only needs to connect the disassembly tool of the present invention to the drilling pump valve cover, connect the manual hydraulic pump of the tool in the drilling pump, and operate the manual hydraulic pump to complete the tightening and disassembly of the drilling pump cylinder cover, which greatly saves manpower. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a torque-adjustable disassembly and assembly tool for a drilling pump of the present invention;

[0021] Figure 2 yes Figure 1 CC section view;

[0022] Figure 3 yes Figure 2 A partial enlarged view of the middle A;

[0023] Figure 4 yes Figure 1 A partial enlarged view of point B in the middle;

[0024] Figure 5 The present invention is an assembly diagram of a torque-adjustable disassembly and assembly tool for a drilling pump during use.

[0025] In the figure: 1. Housing, 2. Rotating blades, 3. Bolts, 4. Fixed blades, 5. Bolt a, 6. Rotating shaft, 7. Bearing end cover, 8. Pin a, 9. Pin, 10. Bolt b, 11. Reaction arm, 12. Tightening sleeve, 13. Bearing, 14. Sealing sleeve, 15. Dust ring, 16. Indicator rod, 17. Disc spring, 18. Calibration nut, 19. Locking nut, 20. Nut, 21. Torsion spring, 22. Through hole, 23. Tightening tool oil port, 24. Oil discharge port. DETAILED DESCRIPTION

[0026] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Example 1

[0028] The present invention provides a torque-adjustable disassembly and assembly tool for a drilling pump, such as Figure 1-2 As shown, it includes a shell 1, a circular through hole 22 is opened in the shell 1, a rotating shaft 6 coaxial with the through hole 22 is arranged in the through hole 22, a rotating blade 2 and a fixed blade 4 are arranged between the surface of the rotating shaft 6 and the inner wall of the through hole 22, the rotating blade 2 is fixedly connected to the rotating shaft 6, and the fixed blade 4 is fixedly connected to the shell 1, the rotating blade 2 and the fixed blade 4 divide the space between the surface of the rotating shaft 6 and the inner wall of the through hole 22 into two chambers, the rotating shaft 6 and the shell 1 are also commonly connected with a bearing end cover 7 at both ends, one end of the rotating shaft 6 extends out of the corresponding side of the bearing end cover 7 and is fixedly connected to a tightening sleeve 12, the other end of the rotating shaft 6 extends out of the corresponding side of the bearing end cover 7 and is connected to a torsion spring 21, the torsion spring 21 is respectively fixed on the bearing end cover 7 and the rotating shaft 6 on the side where it is set, so that a damping restoring torque is generated when the two rotate relative to each other, a tightening tool oil port 23 and an oil discharge port 24 are also provided on the shell 1, and a torque indicating mechanism is also provided on the shell 1.

[0029] The side of the rotating blade 2 close to the rotating shaft 6 is in contact with the surface of the rotating shaft 6 and is adapted in shape, the side of the rotating blade 2 facing away from the rotating shaft 6 is in contact with the inner wall of the through hole 22 and is adapted in shape, the side of the fixed blade 4 close to the inner wall of the through hole 22 is in contact with the inner wall of the through hole 22 and is adapted in shape, the side of the fixed blade 4 close to the inner wall of the through hole 22 is fixedly connected to the housing 1, and the side of the fixed blade 4 close to the rotating shaft 6 is in contact with the surface of the rotating shaft 6 and is adapted in shape.

[0030] like Figure 4As shown, the torque indicating mechanism includes a two-step step hole arranged on the shell 1, the diameter of the two-step step hole on one side close to the through hole 22 is smaller than the diameter close to the outer end of the shell 1, and the two-step step hole is connected to the through hole 22 on one side close to the through hole 22, and the nut 20, the disc spring 17 and the calibration nut 18 are arranged in sequence from the inside to the outside of the two-step step on the end close to the outer side of the shell 1, and the other end of the calibration nut 18 extends out of the shell 1 and is connected with a locking nut 19, and there is also an indicating rod 16, which passes through the calibration nut 18, the disc spring 17, the nut 20 and the end of the two-step hole close to the through hole 22 and is threadedly connected to the nut 20, one end of the indicating rod 16 passes through the calibration nut 18 and extends to the outside of the shell 1 and is provided with a scale, the oil unloading port 24 is connected to the end of the two-step step hole close to the through hole 22, and the tightening tool oil port 23 and the end of the two-step hole close to the through hole 22 are connected to the same chamber.

[0031] like Figure 3 As shown, the rotating shaft 6 and the bearing end cover 7 are rotatably connected through the bearing 13. A sealing sleeve 14 is provided between the rotating shaft 6 and the bearing end cover 7 on the side of the bearing 13 away from the housing 1. A dust ring 15 is also sleeved on the outer circumference of the sealing sleeve 14. The bearing end cover 7 is fixedly connected to the housing 1 by bolts b10. The bearing 13 ensures the rotation performance. The sealing sleeve 14 is installed in the bearing end cover 7 to ensure the sealing inside the tool and prevent the hydraulic oil in the cavity from flowing out. The dust ring 15 is provided to prevent external stains from entering the cavity and causing pollution.

[0032] The rotating blade 2 is fixedly connected to the rotating shaft 6 via bolts 3 and a pin 9, and the fixed blade 4 is fixedly connected to the housing 1 via bolts a5 and a pin a8.

[0033] The rotating shaft 6 slides in relative contact with the fixed blade 4 as the rotating blade 2 rotates. The rotating blade 2 slides in contact with the inner surface of the shell 1. A wear-resistant elastic coating is provided on the sliding contact surface of the rotating blade 2 and the fixed blade 4 to ensure the sealing of the contact surface to meet the tool performance requirements.

[0034] A sealing device is provided between the indicator rod 16 and one side of the two-step hole close to the through hole 22 .

[0035] Reaction arms 11 are fixedly connected to both ends of the housing 1 in the radial direction of the rotating shaft 6 .

[0036] In this embodiment, the position where the oil unloading port 24 is connected to the two-step hole is determined according to the maximum torque for tightening the cylinder valve cover. The maximum compression downward distance of the indicator rod 16 when the cylinder valve cover reaches the maximum torque is determined according to the torque of the cylinder valve cover to be tightened and the compression rebound force of the disc spring 17. The oil unloading port 24 is set at the maximum downward position of the indicator rod 16 in the two-step hole to prevent the problem of over-tightening of the cylinder valve cover due to excessive hydraulic oil being driven in. When the pressure in the hydraulic chamber exceeds the hydraulic oil required for the maximum torque, the hydraulic oil in the chamber is automatically depressurized through the oil unloading port to provide safety protection.

[0037] The working principle of the torque indicating mechanism in this embodiment is that during the process of injecting hydraulic oil into the cavity with a hand pump, the hydraulic oil drives the rotating shaft 6 to rotate through the rotating blades 2, and the torque of the rotation is proportional to the hydraulic oil pressure that pushes the rotating blades 2 at this time. The torque indicating mechanism arranged in the tool pushes a piston-like indicating rod 16 through the hydraulic oil pressure, and the nut 20 connected to the indicating rod 16 compresses the disc spring 17, and the spring produces a displacement, which is proportional to the hydraulic oil pressure, so that the downward displacement of the indicating rod 16 is proportional to the torque output by the rotating shaft. Through conversion and test calibration of each tool before leaving the factory, the scale position and graduation unit on the indicating rod and the target scale position when the required torque is reached are determined, so that the working torque of the tool of the invention when tightened is indicated to meet the needs of on-site operation.

[0038] Example 2

[0039] The working method of the torque-adjustable disassembly and assembly tool for a drilling pump of the present invention adopts the torque-adjustable disassembly and assembly tool for a drilling pump in Embodiment 1, specifically, as follows:

[0040] like Figure 5 As shown, tightening mode: connect the tightening sleeve 12 to the cylinder valve cover, fix the other end of the reaction arm 11 to the two ends of the cylinder valve cover to be tightened, connect the hand pump oil filling pipeline to the tightening tool oil port 23, operate the hand pump to drive the hydraulic oil into the corresponding chamber and then push the rotating blade 2 to rotate. At the same time, the hydraulic oil enters the two-step hole through one end of the two-step hole connecting the chamber, press down the indicator rod 16 together with the nut 20, compress the disc spring 17, and at the same time, the indicator rod 16 slowly extends out of the housing 1. During the whole process, the operator observes the scale of the indicator rod 16 of the torque indicating mechanism. When the indicator rod 16 begins to extend, the hand pump oil filling should be carried out slowly. When the scale displayed by the extended indicator rod 16 is the target scale, the oil filling stops, the reaction arm 11 is knocked off, the tool is removed, and the valve cover is tightened;

[0041] Disassembly mode: connect the tightening sleeve 12 to the cylinder valve cover, fix the other end of the reaction arm 11 at both ends of the cylinder valve cover to be disassembled in the opposite direction of the force direction of the reaction arm 11 in the tightening mode, connect the hand pump return oil pipeline to the tightening tool oil port 23, and the rotating blade 3 rotates in the opposite direction after the hydraulic oil is extracted. As the hydraulic oil is extracted, the force applied to the disc spring 17 gradually disappears, and the indicator rod 16 is retracted upward. During the process, the operator observes the scale 16 on the indicator rod, and the hand pump return oil pipeline should be returned slowly. After the cylinder valve cover to be disassembled is rotated a quarter of a turn, the oil return stops, knock to remove the reaction arm 11, remove the tool, and the valve cover can be disassembled manually.

[0042] Example 3

[0043] On the basis of the first embodiment, a plurality of disc springs are provided to form a disc spring group.

[0044] The tool of the present invention adopts hydraulic control, is easy to operate and use, replaces high-intensity manual hammering, reduces manual labor and avoids product damage. When the valve cover is tightened, the torque also reaches the required value, which meets the operating specifications. The hand pump used in conjunction with the tool is a tool that comes with the drilling pump and does not need to be purchased again. The tool operation process is relatively simple and easy for operators to use. The torque indicating mechanism facilitates observation of the tightening torque value during operation, and torque measurement is completed simply and effectively. The torque display of the mechanical structure has the advantages of greatly reduced failure rate and not prone to damage such as bumps.

Claims

1. A torque-adjustable disassembly and assembly tool for a drilling pump, characterized in that: The invention comprises a shell (1), wherein a circular through hole (22) is provided in the shell (1), a rotating shaft (6) coaxial with the through hole (22) is provided in the through hole (22), a rotating blade (2) and a fixed blade (4) are provided between the surface of the rotating shaft (6) and the inner wall of the through hole (22), the rotating blade (2) is fixedly connected to the rotating shaft (6), the fixed blade (4) is fixedly connected to the shell (1), the rotating blade (2) and the fixed blade (4) divide the space between the surface of the rotating shaft (6) and the inner wall of the through hole (22) into two chambers, the rotating shaft (6) and the shell (1) are also connected at both ends with a bearing end cover (7), one end of the rotating shaft (6) protrudes from the corresponding side of the bearing end cover (7) and is fixedly connected to a tightening sleeve (12), the shell (1) is also provided with a tightening tool oil port (23) and an oil discharge port (24), and the shell (1) is also provided with a torque indicating mechanism.

2. The torque-adjustable disassembly and assembly tool for a drilling pump according to claim 1, characterized in that: The side of the rotating blade (2) close to the rotating shaft (6) contacts with the surface of the rotating shaft (6) and is adapted in shape; the side of the rotating blade (2) facing away from the rotating shaft (6) contacts with the inner wall of the through hole (22) and is adapted in shape; the side of the fixed blade (4) close to the inner wall of the through hole (22) contacts with the inner wall of the through hole (22) and is adapted in shape; the side of the fixed blade (4) close to the inner wall of the through hole (22) is fixedly connected to the housing (1); the side of the fixed blade (4) close to the rotating shaft (6) contacts with the surface of the rotating shaft (6) and is adapted in shape.

3. The torque-adjustable disassembly and assembly tool for a drilling pump according to claim 2, characterized in that: The other end of the rotating shaft (6) extends out of the bearing end cover (7) on the corresponding side and is connected to a torsion spring (21). The torsion spring (21) is respectively fixed to the bearing end cover (7) on the side where it is set and the rotating shaft (6).

4. The torque-adjustable disassembly and assembly tool for a drilling pump according to claim 3, characterized in that: The torque indicating mechanism comprises a two-step stepped hole provided on the housing (1), the diameter of the two-step stepped hole on the side close to the through hole (22) being smaller than the diameter of the end close to the outside of the housing (1), and the two-step stepped hole on the side close to the through hole (22) being connected to the through hole (22), a nut (20), a disc spring (17) and a calibration nut (18) being arranged in sequence from the inside to the outside of the two-step stepped hole on the end close to the outside of the housing (1), the other end of the calibration nut (18) extending out of the housing (1) and connected to a locking nut (19), and also indicating The indicating rod (16) passes through the calibration nut (18), the disc spring (17), the nut (20) and one end of the two-step hole close to the through hole (22) and is connected to the nut (20) by a thread; one end of the indicating rod (16) passes through the calibration nut (18) and extends to the outside of the housing (1) and is provided with a scale; the oil discharge port (24) is communicated with one end of the two-step hole close to the through hole (22), and the tightening tool oil port (23) and one end of the two-step hole close to the through hole (22) are communicated with the same chamber.

5. The torque-adjustable disassembly and assembly tool for a drilling pump according to claim 4, characterized in that: The rotating shaft (6) and the bearing end cover (7) are rotatably connected via a bearing (13). A sealing sleeve (14) is provided between the rotating shaft (6) and the bearing end cover (7) on a side of the bearing (13) away from the housing (1). A dust ring (15) is also provided on the outer circumference of the sealing sleeve (14).

6. The torque-adjustable disassembly and assembly tool for a drilling pump according to claim 4, characterized in that: The rotating blade (2) is fixedly connected to the rotating shaft (6) via bolts (3) and a pin (9), and the fixed blade (4) is fixedly connected to the housing (1) via bolts a (5) and a pin a (8).

7. The torque-adjustable disassembly and assembly tool for a drilling pump according to claim 4, characterized in that: The rotating shaft (6) contacts and slides with the fixed blades (4) when the rotating blades (2) rotate, and the rotating blades (2) contact and slide with the inner surface of the shell (1).

8. The torque-adjustable disassembly and assembly tool for a drilling pump according to claim 4, characterized in that: A sealing device is provided between the indicating rod (16) and a side of the two-step hole close to the through hole (22).

9. The torque-adjustable disassembly and assembly tool for a drilling pump according to claim 4, characterized in that: The housing (1) is fixedly connected to reaction arms (11) at both ends of the rotating shaft (6) in the radial direction.

10. A method for operating a torque-adjustable disassembly and assembly tool for a drilling pump, characterized in that: The torque-adjustable disassembly and assembly tool for a drilling pump according to claim 9 is specifically: Tightening mode: connect the tightening sleeve (12) to the cylinder valve cover, fix the other end of the reaction arm (11) to the two ends of the cylinder valve cover to be tightened, connect the hand pump oil filling pipeline to the tightening tool oil port (23), operate the hand pump to drive the hydraulic oil into the corresponding chamber and then push the rotating blade (2) to rotate. At the same time, the hydraulic oil enters the two-step hole through one end of the two-step hole connecting the chamber, presses the indicator rod (16) together with the nut (20), compresses the disc spring (17), and at the same time, the indicator rod (16) slowly extends out of the housing (1). During the whole process, the operator observes the scale on the indicator rod (16) of the torque indicating mechanism. When the indicator rod (16) begins to extend, the hand pump oil filling should be carried out slowly. When the scale displayed by the indicator rod (16) is the target scale, the oil filling stops, knocks and removes the reaction arm (11), removes the tool, and completes the valve cover tightening; Disassembly mode: Connect the tightening sleeve (12) to the cylinder valve cover, fix the other end of the reaction arm (11) to the two ends of the cylinder valve cover to be disassembled in the opposite direction of the force direction of the tightening mode reaction arm (11), connect the hand pump oil return pipeline to the tightening tool oil port (23), and after the hydraulic oil is pumped out, the rotating blade (3) rotates in the opposite direction. As the hydraulic oil is pumped back, the force applied to the disc spring (17) gradually disappears, and the indicator rod (16) is retracted upward. During the process, the operator observes the scale on the indicator rod (16). The oil return of the hand pump oil return pipeline should be carried out slowly. After the cylinder valve cover to be disassembled is rotated a quarter of a turn, the oil return stops, knock and remove the reaction arm (11), remove the tool, and the valve cover can be disassembled manually.

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