Drawing device for disassembling rotating shaft of underground equipment

Abstract

The utility model relates to the field of mining underground equipment, in particular to a drawing device for disassembling a rotating shaft of underground equipment, which comprises a cylinder body, a propelling cavity arranged at the center of the cylinder body, a guide port arranged at the top of the cylinder body, a drawing port arranged at the bottom of the cylinder body, and a limit table arranged at the other end of the propelling cavity. The drawing opening penetrates through the limiting table and communicates with the propelling cavity, and a first oil inlet and a second oil inlet are formed in the side wall of the cylinder body; the plunger is arranged in the propelling cavity; the guide sleeve is arranged at one end of the plunger in a sleeving manner; the gland is arranged at the other end of the plunger in a sleeving manner; the clamping ring is arranged between the gland and the guide sleeve; the inner sleeve is arranged in the sleeve cavity of the plunger; the screw assembly is communicated with the plunger and the inner sleeve; the drawing screw rod is arranged at one end of the screw rod assembly; and the supporting assembly is arranged at the bottom of the cylinder body. The length of the cylinder body is reduced, and the drawing motion stroke is reduced, so that most narrow working environments are met.

Description

Technical Field

[0001] This utility model relates to the field of underground mining equipment, and in particular to a pull-out device for disassembling the shaft of underground equipment. Background Technology

[0002] Coal mine underground mining equipment (coal mining machines, tunneling machines, drilling rigs, etc.) often have shafts designed for blind hole installation due to the size and structure of the equipment and to prevent mechanical damage. This means that the shaft can only be inserted from the open side of the blind hole. A nut or threaded hole of a certain specification is machined at the shaft end for installing a pulling tool during disassembly. Therefore, under normal circumstances, the shaft can be disassembled from the blind hole using a pulling tool.

[0003] When the work site space is confined, the main body of the existing pulling tools is too long and cannot be adapted to the work site, making it impossible to install and operate the pulling tools. As a result, the equipment cannot be removed because the shaft cannot be removed, and the entire component needs to be disassembled and transferred to the ground for inspection and replacement, thereby increasing maintenance time, affecting overall production efficiency, and increasing the labor intensity and safety hazards of the operators. Utility Model Content

[0004] This utility model provides a pulling device for disassembling the shaft of downhole equipment. It reduces the length of the cylinder and provides a guide port and a pulling port that are connected at the top and bottom of the cylinder to facilitate the vertical movement of the plunger, inner sleeve and screw assembly in the cylinder. The shaft is pulled out by the pulling screw provided on the screw assembly, which reduces the pulling stroke and is suitable for most narrow working environments.

[0005] To achieve the above objectives, this utility model provides a pull-out device for disassembling the shaft of downhole equipment, comprising:

[0006] A cylinder body is provided, with a propulsion chamber at its center, a guide port at the top of the cylinder body, one end of the propulsion chamber communicating with the guide port, a pull-out port at the bottom of the cylinder body, a limiting platform at the other end of the propulsion chamber, and the pull-out port communicating with the propulsion chamber through the limiting platform. A first oil inlet and a second oil inlet are provided on the side wall of the cylinder body, the first oil inlet being close to the guide port and the second oil inlet being close to the pull-out port. The first oil inlet is communicating with the propulsion chamber, and one end of the second oil inlet is communicating with the other end of the propulsion chamber through the limiting platform.

[0007] A plunger is disposed in the propulsion cavity. The plunger includes a propulsion end and a sliding end. The diameter of the propulsion end is larger than the diameter of the sliding end. The propulsion end contacts the limiting platform. An inner sleeve cavity and a first threaded hole are disposed inside the plunger from bottom to top. The diameter of the inner sleeve cavity is larger than the diameter of the first threaded hole.

[0008] A guide sleeve is fitted onto the sliding end of the plunger. A drainage groove is provided on the outer wall of the guide sleeve near the bottom. The drainage groove is close to the first oil inlet. A plurality of first fixing screw holes are provided on the top of the guide sleeve.

[0009] A pressure cap is sleeved on the sliding end of the plunger and is located directly above the guide sleeve. A first retaining ring groove is provided on the outer side wall of the pressure cap near the bottom. A plurality of second fixing screw holes are provided on the top of the pressure cap, and the first fixing screw holes cooperate with the second fixing screw holes.

[0010] A retaining ring is provided on the inner wall of the propulsion cavity near the guide port, and the first retaining ring groove cooperates with the second retaining ring groove. The retaining ring is disposed in the first retaining ring groove and the second retaining ring groove.

[0011] An inner sleeve is disposed within the inner sleeve cavity. A limiting ring groove is provided on the inner wall of the pull-out port near the limiting platform. A limiting ring is provided on the outer wall of the inner sleeve. The limiting ring cooperates with the limiting ring groove. An inner column seal and a guide ring are provided at one end of the inner sleeve. The inner column seal is located above the guide ring. A retaining ring is provided at the other end of the inner sleeve. A through second threaded hole is provided at the center of the inner sleeve. The second threaded hole cooperates with the first threaded hole.

[0012] Screw assembly, the screw assembly connecting the plunger and the inner sleeve;

[0013] A pull screw, wherein the pull screw is disposed at one end of the screw assembly;

[0014] A support assembly is disposed at the bottom of the cylinder body, and the pulling screw passes through the support assembly.

[0015] Furthermore, a first sealing groove is provided on the side wall of the propulsion end, and a second sealing groove is provided on the inner wall of the inner sleeve cavity.

[0016] Furthermore, the outer wall of the guide sleeve is provided with a plurality of third sealing grooves, and the inner wall of the guide sleeve is provided with a plurality of fourth sealing grooves.

[0017] Furthermore, there is a gap between one end of the inner sleeve and the end of the inner sleeve cavity near the first threaded hole.

[0018] Furthermore, an inner sealing groove is provided on the inner wall of the pull-out port.

[0019] Furthermore, the screw assembly includes a washer, a locking nut, and a sliding screw. One end of the sliding screw passes through the first threaded hole and the second threaded hole. The washer is sleeved on the other end of the sliding screw and contacts the sliding end. The locking nut is screwed into the other end of the sliding screw and contacts the washer. One end of the pull screw is located at one end of the sliding screw.

[0020] Furthermore, the support assembly includes a support sleeve, one end of which is disposed at the bottom of the cylinder body.

[0021] Compared with the prior art, the pull-out device for disassembling the shaft of downhole equipment according to an embodiment of the present invention has a propulsion chamber in the cylinder body, and a limiting platform is provided near the pull-out port of the propulsion chamber. At the same time, guide ports and pull-out ports are provided at the top and bottom of the cylinder body to form a pull-out working stroke, thereby reducing the pull-out work and making it more suitable for narrow working environments. It also includes a plunger, an inner sleeve and a screw assembly. The inner sleeve is located in the inner sleeve cavity of the plunger to prevent hydraulic oil leakage. The screw assembly links the plunger and the inner sleeve. At the same time, a pull-out screw is provided at one end of the screw assembly for pulling out the shaft, and hydraulic oil is introduced to assist the plunger in moving up and down in the propulsion chamber, thereby realizing the shaft pulling operation. Multiple sealing gaskets are provided between the components to prevent hydraulic oil leakage. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a pull-out device for disassembling the shaft of downhole equipment according to the present invention;

[0023] Figure 2 for Figure 1 A magnified schematic diagram of a portion of region A in the middle;

[0024] Figure 3 for Figure 1 A magnified schematic diagram of a portion of region B.

[0025] Figure label:

[0026] 1000. Cylinder block; 1100. Propulsion chamber; 1110. Second retaining ring groove; 1200. Guide port; 1300. Pull-out port; 1310. Limiting ring groove; 1320. Inner sleeve sealing groove; 1400. Limiting platform; 1500. First oil inlet; 1600. Second oil inlet;

[0027] 2000. Plunger; 2100. Propulsion end; 2110. First sealing groove; 2200. Sliding end; 2300. Inner sleeve cavity; 2310. Second sealing groove; 2400. First threaded hole;

[0028] 3000. Guide sleeve; 3100. Drainage groove; 3200. First fixing screw hole; 3300. Third sealing groove; 3400. Fourth sealing groove;

[0029] 4000. Pressure cap; 4100. First retaining ring groove; 4200. Second fixing screw hole;

[0030] 5000. Snap ring;

[0031] 6000. Inner sleeve; 6100. Limiting ring; 6200. Inner column sealing groove; 6300. Guide ring; 6400. Retaining ring; 6500. Second threaded hole;

[0032] 7100. Washer; 7200. Lock nut; 7300. Sliding screw;

[0033] 8000. Pulling screw;

[0034] 9100. Support component; 9200. Equipment surface; 9300. Shaft. Detailed Implementation

[0035] To provide a better understanding of the purpose, structure, features, and functions of this utility model, detailed descriptions are provided below with reference to specific embodiments.

[0036] like Figures 1-3 As shown, a pull-out device for disassembling the shaft of downhole equipment according to an embodiment of the present invention includes:

[0037] Cylinder block 1000, plunger 2000, guide sleeve 3000, gland 4000, retaining ring 5000, inner sleeve 6000, screw assembly, pull screw 8000, and support assembly 9100;

[0038] A propulsion chamber 1100 is provided at the center of the cylinder block 1000. A guide port 1200 is provided at the top of the cylinder block 1000. One end of the propulsion chamber 1100 is connected to the guide port 1200. A pull-out port 1300 is provided at the bottom of the cylinder block 1000. A limiting platform 1400 is provided at the other end of the propulsion chamber 1100. The pull-out port 1300 passes through the limiting platform 1400 and is connected to the propulsion chamber 1100. A first oil inlet 1500 and a second oil inlet 1600 are provided on the side wall of the cylinder block 1000. The first oil inlet 1500 is close to the guide port 1200, and the second oil inlet 1600 is close to the pull-out port 1300. The first oil inlet 1500 is connected to the propulsion chamber 1100, and one end of the second oil inlet 1600 passes through the limiting platform 1400 and is connected to the other end of the propulsion chamber 1100.

[0039] The plunger 2000 is disposed in the propulsion cavity 1100. The plunger 2000 includes a propulsion end 2100 and a sliding end 2200. The diameter of the propulsion end 2100 is larger than the diameter of the sliding end 2200. The propulsion end 2100 contacts the limiting stage 1400. The plunger 2000 has an inner sleeve cavity 2300 and a first threaded hole 2400 arranged from bottom to top. The diameter of the inner sleeve cavity 2300 is larger than the diameter of the first threaded hole 2400.

[0040] The guide sleeve 3000 is fitted onto the sliding end 2200 of the plunger 2000. A flow channel 3100 is provided on the outer wall of the guide sleeve 3000 near the bottom. The flow channel 3100 is close to the first oil inlet 1500. Multiple first fixing screw holes 3200 are provided on the top of the guide sleeve 3000.

[0041] The pressure cap 4000 is sleeved on the sliding end 2200 of the plunger 2000, and the pressure cap 4000 is located directly above the guide sleeve 3000. The outer side wall of the pressure cap 4000 near the bottom is provided with a first retaining ring groove 4100, and the top of the pressure cap 4000 is provided with a plurality of second fixing screw holes 4200, and the first fixing screw holes 3200 cooperate with the second fixing screw holes 4200.

[0042] The inner wall of the propulsion cavity 1100 near the guide port 1200 is provided with a second retaining ring groove 1110, the first retaining ring groove 4100 and the second retaining ring groove 1110 cooperate, and the retaining ring 5000 is disposed in the first retaining ring groove 4100 and the second retaining ring groove 1110.

[0043] The inner sleeve 6000 is set inside the inner sleeve cavity 2300. The inner wall of the pull-out port 1300 near the limiting platform 1400 is provided with a limiting ring groove 1310. The outer wall of the inner sleeve 6000 is provided with a limiting ring 6100, which cooperates with the limiting ring groove 1310. One end of the inner sleeve 6000 is provided with an inner column sealing groove 6200 and a guide ring 6300. The inner column sealing groove 6200 is located above the guide ring 6300. The other end of the inner sleeve 6000 is provided with a retaining ring 6400. The center of the inner sleeve 6000 is provided with a through second threaded hole 6500, which cooperates with the first threaded hole 2400.

[0044] The screw assembly connects the plunger 2000 and the inner sleeve 6000;

[0045] The pull screw 8000 is located at one end of the screw assembly;

[0046] The support assembly 9100 is located at the bottom of the cylinder body 1000, and the pull screw 8000 passes through the support assembly 9100;

[0047] When installing the pull-out device for disassembling the shaft of downhole equipment according to this utility model, the user first installs the relevant seals and guide ring 6300 into the inner sleeve cavity 2300, then installs the inner sleeve 6000 into the inner sleeve cavity 2300. After completing the installation of the inner sleeve 6000, the screw assembly is installed, so that the screw assembly connects the plunger 2000 and the inner sleeve 6000. After completing the installation of the screw assembly, the relevant seals are then installed on the outer wall of the pushing end 2100 of the plunger 2000. Then, the plunger 2000 with the inner sleeve 6000 is installed into the pushing cavity 1100, ensuring that the limiting ring 6100 of the inner sleeve 6000 contacts and engages with the limiting ring groove 1310, and at the same time ensuring that the bottom of the pushing end 2100 of the plunger 2000 contacts the limiting platform 1400. After that, the guide sleeve 3000 is fitted onto the sliding end 2200 of the plunger 2000. When installing the guide sleeve 3000, relevant seals need to be installed, and the guide sleeve 3000's drainage groove 3100 should be close to the first oil inlet 1500. After the guide sleeve 3000 is installed, the retaining ring 5000 is placed in the second retaining ring groove 1110, and then the pressure cap 4000 is fitted onto the sliding end 2200 of the plunger 2000, so that the first retaining ring groove 4100 of the pressure cap 4000 and the retaining ring 5000 are engaged. At this time, the second fixing screw hole 4200 of the pressure cap 4000 coincides with the first fixing screw hole 3200 of the guide sleeve 3000. Then, use fixing bolts to tighten the second fixing screw hole 4200 and the first fixing screw hole 3200 to lock the guide sleeve 3000. At the same time, the pull screw 8000 is installed on the screw assembly, and the support assembly 9100 is installed on the bottom of the cylinder block 1000, ensuring that the pull screw 8000 passes through the support assembly 9100.

[0048] After the above assembly is completed, the present invention is in its initial state. Using the pull-out device of the present invention for disassembling the shaft of downhole equipment, the shaft 9300 inside the blind hole of the equipment is disassembled. The pull-out screw 8000 is pre-screwed into the threaded hole of the shaft head of the shaft 9300 until the support assembly 9100 contacts the equipment surface 9200, thus completing the fixation of the shaft 9300. At this time, the user carries the hydraulic oil injection device. The hydraulic oil injection device has a certain pressure when injecting oil. After the user connects the injection end of the hydraulic oil injection device to the second oil inlet 1600, the hydraulic oil injection device is turned on. The pressurized hydraulic oil enters the propulsion chamber 1100 and pushes the propulsion end 2100 of the plunger 2000, causing the plunger 2000 to move vertically upwards until the plunger... The upper surface of the 2000 push end 2100 contacts the ground of the guide sleeve 3000. At this time, the sliding end 2200 of the plunger 2000 extends beyond the guide port 1200 of the cylinder body 1000, so that the plunger 2000 reaches the maximum limit. During the rise of the plunger 2000, the screw assembly rises synchronously with the plunger 2000, and the pull screw 8000 set at one end of the screw assembly rises synchronously with the screw assembly, thereby lifting the shaft 9300 connected to the pull screw 8000 upward, so as to pull out the shaft 9300. After the above disassembly of the shaft 9300 is completed, the user shuts off the hydraulic oil spraying device and removes the pull device of this utility model for disassembling the shaft of the downhole equipment from the surface 9200 of the equipment. Then, the damaged shaft 9300 is disassembled from the pull screw 8000.

[0049] At this point, the pull-out device for disassembling the shaft of downhole equipment of this utility model needs to be returned to its initial state. First, connect the hydraulic oil recovery device to the first inlet 1500 and the hydraulic oil ejection device to the second inlet 1600. Turn on the hydraulic oil ejection device, and hydraulic oil with a certain pressure enters the propulsion chamber 1100 through the second inlet 1600. At this time, the propulsion end 2100 of the plunger 2000 contacts the bottom of the guide sleeve 3000, while the hydraulic oil with a certain pressure pre-contacts the guide sleeve 3000. The flow channel 3100 gradually pushes the plunger 2000 downwards vertically, squeezing the hydraulic oil in the lower part of the thrust cavity 1100 of the plunger 2000's thrust end 2100. This causes the hydraulic oil to enter the hydraulic oil recovery device through the first oil inlet 1500 until the thrust end 2100 of the plunger 2000 contacts the limiting platform 1400. The limiting ring 6100 of the inner sleeve 6000 contacts the limiting ring groove 1310, causing the plunger 2000 to return to its initial position. At this time, the pull screw 8000 extends out of the support assembly 9100, ready for the next use.

[0050] Furthermore, such as Figure 3As shown, a first sealing groove 2110 is provided on the side wall of the propulsion end 2100, and a second sealing groove 2310 is provided on the inner wall of the inner sleeve cavity 2300. A sealing gasket is provided in the first sealing groove 2110 to isolate the sliding end 2200 from the propulsion end 2100 and prevent hydraulic oil backflow, which would affect the rise or fall of the plunger 2000. A sealing gasket is provided in the second sealing groove 2310 to prevent hydraulic oil entering through the first oil inlet 1500 from leaking from the inner sleeve 6000 into the inner sleeve cavity 2300 of the plunger 2000 when driving the plunger 2000, thus achieving a good sealing effect.

[0051] Furthermore, such as Figure 2 As shown, the outer wall of the guide sleeve 3000 is provided with multiple third sealing grooves 3300, and the inner wall of the guide sleeve 3000 is provided with multiple fourth sealing grooves 3400. Corresponding sealing gaskets are installed in the third sealing grooves 3300 and the fourth sealing grooves 3400 to prevent hydraulic oil leakage from the gap between the guide sleeve 3000 and the rod body or the gap between the guide sleeve 3000 and the plunger 2000, ensuring the sealing performance of the propulsion cavity 1100 and guaranteeing the stable movement of the plunger 2000.

[0052] Furthermore, such as Figure 2 As shown, there is a gap between one end of the inner sleeve 6000 and the end of the inner sleeve cavity 2300 near the first threaded hole 2400. This gap is to prevent the plunger 2000 from squeezing the inner sleeve 6000, causing mechanical damage or hydraulic oil leakage.

[0053] Furthermore, such as Figure 3 As shown, an inner sleeve sealing groove 1320 is provided on the inner wall of the pull-out port 1300. An inner sleeve seal is provided in the inner sleeve sealing groove 1320. The inner sleeve seal is used to prevent hydraulic oil from leaking out of the cylinder 1000 through the inner sleeve 6000 and the pull-out port 1300.

[0054] Furthermore, such as Figure 1 As shown, the screw assembly includes a washer 7100, a locking nut 7200, and a sliding screw 7300. One end of the sliding screw 7300 passes through a first threaded hole 2400 and a second threaded hole 6500. The washer 7100 is fitted onto the other end of the sliding screw 7300 and contacts the sliding end 2200. The locking nut 7200 is screwed into the other end of the sliding screw 7300 and contacts the washer 7100. One end of the pull screw 8000 is located at one end of the sliding screw 7300. The sliding screw 7300 is threaded into the first threaded hole 2400 and the second threaded hole 6500, enabling the plunger 2000 to move in conjunction with the inner sleeve. At the same time, the locking nut 7200 and the washer 7100 further assist in fixing the sliding screw 7300 and stabilizing the pull screw 8000 at one end of the sliding screw 7300.

[0055] Furthermore, such as Figure 1 As shown, the support assembly 9100 includes a support sleeve, one end of which is located at the bottom of the cylinder body 1000. The diameter of the hollow inner wall of the support sleeve is larger than the diameter of the drawing port 1300, which facilitates the movement of the drawing screw 8000 within the hollow cavity of the support sleeve.

[0056] Preferably, the guide ring 6300 is used to prevent mechanical friction between the mating surfaces of the plunger 2000 and the inner sleeve 6000, thus preventing damage and sealing failure. The guide ring 6300 is made of hard nylon, which can protect the surface of the parts from friction damage while ensuring mechanical strength.

[0057] Preferably, the inner column sealing groove 6200 is used to further prevent hydraulic oil from entering the gap between one end of the inner sleeve 6000 and the end of the inner sleeve cavity 2300 near the first threaded hole 2400.

[0058] In the description of this utility model, it should be understood that the terms "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" and their orientation or positional relationships are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0059] This utility model has been described by the above-described embodiments; however, these embodiments are merely examples for implementing this utility model. It must be noted that the disclosed embodiments do not limit the scope of this utility model. Conversely, any modifications and refinements made without departing from the spirit and scope of this utility model are within the scope of patent protection of this utility model.

Claims

1. A pulling device for dismounting a shaft of a downhole device, characterized in that The utility model relates to a cylinder, a plunger, a guide sleeve, a gland, a clasp ring, an inner sleeve, a screw rod assembly and a support assembly. The cylinder comprises a cylinder body, a propelling cavity, a guide port, a drawing port, a limiting platform, a first oil inlet and a second oil inlet. The plunger comprises a propelling end and a sliding end. The guide sleeve comprises a guide groove and a plurality of first fixing screw holes. The gland comprises a first clasp ring groove, a plurality of second fixing screw holes and a second clasp ring groove. The clasp ring is arranged in the first clasp ring groove and the second clasp ring groove. The inner sleeve comprises a limiting ring groove, a limiting ring, an inner column seal, a guide ring, a stop ring, a second threaded hole and a first threaded hole. The screw rod assembly is connected to the plunger and the inner sleeve. The drawing screw rod is arranged at one end of the screw rod assembly. The support assembly is arranged at the bottom of the cylinder body, and the drawing screw rod passes through the support assembly.

2. The puller for dismounting a shaft of a downhole device according to claim 1, characterized in that, The side wall of the propelling end is provided with a first sealing groove, and the inner wall of the inner sleeve cavity is provided with a second sealing groove.

3. The puller for disassembling a shaft of a downhole apparatus according to claim 1, wherein The outer wall of the guide sleeve is provided with a plurality of third sealing grooves, and the inner wall of the guide sleeve is provided with a plurality of fourth sealing grooves.

4. The puller for disassembling a shaft of a downhole apparatus according to claim 1, wherein The end of the inner sleeve close to the first threaded hole has a gap with the end of the inner sleeve cavity.

5. The puller for disassembling a shaft of a downhole apparatus according to claim 1, wherein The inner wall of the drawing port is provided with an inner sleeve sealing groove.

6. The puller for disassembling a shaft of a downhole apparatus according to claim 1, wherein The screw assembly comprises a washer, a locking nut and a sliding screw, one end of the sliding screw passes through the first threaded hole and the second threaded hole, the washer is sleeved on the other end of the sliding screw and is in contact with the sliding end, the locking nut is screwed into the other end of the sliding screw in contact with the washer, and one end of the drawing screw is arranged at one end of the sliding screw.

7. The puller for disassembling a shaft of a downhole apparatus according to claim 1, wherein The support assembly comprises a support sleeve, one end of the support sleeve is arranged at the bottom of the cylinder body.

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