Power head structure

Abstract

The utility model relates to the technical field of coal mine drilling machines, and discloses a power head structure which comprises a gearbox, a main shaft, a connecting shaft and a water braid, the main shaft is arranged in the gearbox, the connecting shaft is arranged in the main shaft, the water braid is arranged at the rear end of the gearbox, a mandrel of the water braid is connected with the tail end of the connecting shaft, and a driving drill rod is arranged at the front end of the connecting shaft. A front end cover is arranged at the end, away from the water braid, of the spindle, the inner wall of the front end cover is clamped with the driving drill rod, and the maximum diameter of the driving drill rod is smaller than the minimum diameter in the spindle. The diameter of the interior of the main shaft is larger than the maximum diameter of the driving drill rod, when the driving drill rod needs to be disassembled, only the water braid needs to be disassembled from the gearbox, and the whole formed by connecting the driving drill rod, the connecting shaft and the water braid can be taken out from the main shaft at the rear end of the gearbox, so that the driving drill rod is rapidly replaced, and the construction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mine drilling machines, in particular to a power head structure. Background Art

[0002] The power head is an important part of the drilling rig, which is used to transmit rotation and propulsion power to the drill rod. Traditional hydraulic drilling rigs generally use a chuck to connect the power head and the drill rod, while most existing automatic drilling rigs use an active drill rod to connect the power head and the drill rod. In order to enable a power head to use drill rods of different outer diameters, a composite drill rod connection mechanism of a chuck and an active drill rod has appeared in recent years. The active drill rod is fixedly connected to the front end of the chuck. By installing and removing the active drill rod, the use of the active drill rod and the chuck is switched to achieve the purpose of clamping drill rods of different outer diameters.

[0003] The existing patent (publication number: CN116905958A) discloses a directional drilling rig power head, including a main motor, a transmission, a main shaft, an active drill rod and a water braid, wherein the transmission has a drive shaft, one end of which is connected to the main motor, and the drive shaft is meshed with the main shaft through the gears in the transmission, one end of the main shaft is circumferentially fixedly connected to the active drill rod, and the other end of the drive shaft is connected to an angle adjuster through the transmission, so that the directional drilling rig power head has the functions of efficiently and accurately adjusting the tool surface and braking the main motor; the mandrel in the water braid is connected to the active drill rod with an axial floating structure through a connecting shaft, and a connecting sleeve is provided at one end of the main shaft close to the water braid to form a hexagonal sleeve sliding pair with the connecting shaft, so that the mandrel support bearing is protected from axial impact during drilling, thereby improving its service life and reducing the number of equipment maintenance times;

[0004] However, the existing patent (publication number: CN116905958A) is insufficient in the quickness of disassembling and assembling the active drill rod. When the active drill rod needs to be replaced, the end cover fixing the active drill rod must be removed from the front end, and then the active drill rod and the connecting shaft must be unlocked before the active drill rod can be taken out from the front end. Since the space from the front end of the chuck to the clamp is very limited and is generally located in the middle of the drilling rig, it is inconvenient to pull out the active drill rod, which easily affects the construction efficiency. Therefore, we propose a power head structure to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a power head structure to solve the problem that when the active drill rod needs to be disassembled and switched to a chuck clamping working condition, it is inconvenient to pull out the active drill rod and the connecting shaft, which easily affects the construction efficiency.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a power head structure, including a gearbox, a main shaft, a connecting shaft and a water braid, the main shaft is arranged inside the gearbox, the connecting shaft is arranged inside the main shaft, the water braid is arranged at the rear end of the gearbox, the core shaft of the water braid is connected to the end of the connecting shaft, an active drill rod is arranged at the front end of the connecting shaft, a front end cover is arranged at the end of the main shaft away from the water braid, the inner wall of the front end cover is clamped with the active drill rod, and the maximum diameter of the active drill rod is smaller than the minimum diameter inside the main shaft.

[0007] The beneficial effect of this solution is that when the active drill rod needs to be replaced, the staff only needs to disconnect the water braid from the gearbox. Since the maximum diameter of the active drill rod is smaller than the minimum diameter inside the main shaft, the staff can quickly pull out the whole connected by the water braid, the connecting shaft and the active drill rod from the rear end of the main shaft, thereby improving the speed of disassembly of the active drill rod. At the same time, the space at the rear end of the gearbox is relatively ample, which is convenient for the staff to replace the active drill rod. To this end, the staff will re-install the replaced active drill rod, the connecting shaft and the water braid into the main shaft from the rear end of the gearbox, thereby improving the installation speed of the active drill rod. Finally, the water braid and the gearbox are fixed, and construction can be carried out quickly.

[0008] Preferably, as an improvement, the front end cover includes a fixed plate and an outer sleeve, the fixed plate is arranged at the end of the main shaft away from the water braid, the outer sleeve is arranged in the middle of the fixed plate, and the inner wall of the outer sleeve is arranged in a polygonal shape, a stop block is provided on the outer wall of the active drill rod, and the stop block is clamped with the inner wall of the outer sleeve.

[0009] The beneficial effect is that the stop block on the outer wall of the active drill rod is clamped with the inner wall of the outer sleeve, so that the active drill rod and the front end cover remain relatively still, so that when the main shaft drives the front end cover to rotate, the active drill rod clamped with the outer sleeve rotates.

[0010] Preferably, as an improvement, a rear end cover is provided at the end of the main shaft close to the water braid, and the rear end cover includes an integrally formed connecting sleeve and an inner ring. The connecting sleeve is provided at the end of the main shaft close to the water braid, the inner ring is located in the middle of the connecting sleeve, and the core shaft of the water braid rotates through the inner ring and is connected to the connecting shaft.

[0011] The beneficial effect is that the end of the connecting sleeve close to the main shaft extends into the inside of the main shaft to prevent the connecting shaft from shaking too much when rotating and hitting the inner wall of the main shaft, thereby causing damage to the inner wall of the main shaft. The inner ring is used to reduce the shaking of the core shaft of the water braid when rotating, and increase the stability of the water braid when working.

[0012] Preferably, as an improvement, one end of the active drill rod is set as a female joint, and the other end is set as a male joint, the female joint is connected to the connecting shaft, and the male joint is connected to the drill rod.

[0013] The beneficial effects are: the male joint can provide clear docking guidance, reduce the time for alignment and adjustment with the drill pipe, and increase the efficiency of docking between the active drill pipe and the drill pipe. At the same time, one end of the active drill pipe is set as a female joint and the other end is set as a male joint to increase the stability of the transmission.

[0014] Preferably, as an improvement, a chuck is provided between the main shaft and the front end cover, and the chuck can axially limit the active drill rod.

[0015] The beneficial effect is that when it is necessary to temporarily replace the drill rod or salvage drill rod with a different outer diameter for work, the staff will remove the water braid, the connecting shaft and the active drill rod connection as a whole from the main shaft, and then pass the replaced drill rod or salvage drill rod through the main shaft, chuck and front end cover from the rear end of the gearbox at one time. At this time, by starting the chuck, the chuck temporarily clamps the replaced drill rod or salvage drill rod, so as to quickly carry out construction according to different working conditions and increase construction efficiency.

[0016] Preferably, as an improvement, the active drill rod is provided with a limit section, and the limit section is located between the chucks, the outer diameter of the female joint and the distance between the opposite sides of the stop block are both larger than the minimum diameter after the chucks are clamped, and the diameter of the limit section is smaller than the minimum diameter after the chucks are clamped.

[0017] The beneficial effects are as follows: the limiting section is located between the female joint and the stop block, and the active drill rod is axially limited by making the outer diameter of the female joint and the distance between the opposite sides of the stop block larger than the minimum diameter after the chuck is clamped, thereby preventing the active drill rod from having a large axial displacement during loading and unloading, thereby preventing axial impact. At the same time, since the diameter of the limiting section is smaller than the minimum diameter after the chuck is clamped, the clamping force of the chuck will not directly act on the active drill rod, thereby avoiding the active drill rod from directly bearing the strong clamping force of the chuck and increasing the service life of the active drill rod.

[0018] Preferably, as an improvement, the length of the limiting section is greater than the clamping width of the chuck, and the limiting section can float axially in the chuck.

[0019] The beneficial effect is that the length of the limit section is greater than the clamping width of the chuck, so that the active drill rod has a certain floating distance in the chuck, so as to alleviate the axial impact generated when the active drill rod is connected or disconnected with the drill rod, thereby protecting the active drill rod.

[0020] Preferably, as an improvement, the outer diameter of the female connector and the diagonal distance of the stop block are both smaller than the diameter of the chuck after it is loosened.

[0021] The beneficial effect is: ensuring that the active drill rod can be taken out from the loosened chuck.

[0022] Preferably, as an improvement, an inner sleeve is provided at one end of the fixed disk close to the chuck, the inner sleeve is provided at the end of the chuck away from the water braid, the inner sleeve is configured as a polygon, and the inner wall of the inner sleeve is congruent with and connected to the inner wall of the outer sleeve.

[0023] The beneficial effects are: by providing the inner sleeve, the clamping length of the active drill rod is extended, the stability of the active drill rod during rotation is increased, and at the same time the contact area with the active drill rod is increased, so that the force per unit area acting on the active drill rod is reduced, thereby extending the service life of the active drill rod.

[0024] Preferably, as an improvement, a gap is provided between the rear end cover and the connecting shaft.

[0025] The beneficial effect is that by setting a gap between the rear end cover and the connecting shaft, the active drill rod, the connecting shaft and the core shaft of the water braid can have a certain axial floating space as a whole, thereby further alleviating the axial impact generated when the active drill rod and the drill rod are connected or disconnected. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the power head of an embodiment of the utility model;

[0027] Figure 2 This is a schematic structural diagram of the rear end cover of an embodiment of the utility model;

[0028] Figure 3 This is a schematic structural diagram of a gap M according to an embodiment of the present utility model;

[0029] Figure 4 This is a schematic diagram of the structure of the active drill rod according to an embodiment of the utility model;

[0030] Figure 5 It is a schematic structural diagram of the front end cover and the inner sleeve of an embodiment of the utility model. DETAILED DESCRIPTION

[0031] The following is further described in detail through specific implementation methods:

[0032] The figure marks in the drawings of the specification include: active drill pipe 1, male joint 101, stop block 102, limit section 103, female joint 104, connecting shaft 2, water braid 3, front end cover 4, fixed plate 401, outer sleeve 402, inner sleeve 403, chuck 5, main shaft 6, gearbox 7, rear end cover 8, connecting sleeve 9, inner ring 10.

[0033] Example

[0034] The embodiment is basically as shown in the attached Figure 1-5 As shown, Figure 1The power head structure shown in the figure includes a gearbox 7, a main shaft 6, a connecting shaft 2 and a water braid 3. The main shaft 6 is rotatably installed inside the gearbox 7. The gearbox 7 can drive the main shaft 6 to rotate. The connecting shaft 2 is rotatably installed inside the main shaft 6. The right end of the connecting shaft 2 is set as an external thread, and the left end is set as a female thread. The left end of the main shaft 6 is fixedly installed with a rear end cover 8 by bolts. The rear end cover 8 includes an integrally formed connecting sleeve 9 and an inner ring 10, as shown in FIG. Figure 2 As shown, the connecting sleeve 9 is symmetrically provided with waist-shaped holes, and the connecting sleeve 9 is fixedly installed on the left end of the main shaft 6 through bolts and the waist-shaped holes. The inner ring 10 is located in the middle of the connecting sleeve 9, and the core shaft of the water braid 3 rotates through the inner ring 10 and is threadedly connected with the left end of the connecting shaft 2. The middle of the inner ring 10 is set as a hexagonal hole, and the outer wall of the core shaft of the water braid 3 is set as a hexagonal shape that is clamped with the hexagonal hole. A gap M is set between the inner ring 10 and the connecting shaft 2, as shown in FIG. Figure 3 As shown, the right end of the spindle 6 is fixed with a chuck 5 by bolts, as shown in FIG. Figure 1 As shown, the chuck 5 is set as a normally open chuck, and the right end of the chuck 5 is provided with a front end cover 4. The active drill rod 1 is rotatably mounted on the chuck 5 and the front end cover 4. Figure 4 As shown, the right end of the active drill rod 1 is set as a male connector 101 for threaded connection with the drill rod, and the left end is set as a female connector 104 for threaded connection with the connecting shaft 2, and the outer diameter of the female connector 104 is smaller than the diameter after the chuck 5 is loosened. The front end cover 4 can drive the active drill rod 1 to rotate, and the front end cover 4 includes a fixed plate 401 and an outer sleeve 402. Figure 5 As shown, the fixed plate 401 is set as a flange plate and is fixedly installed on the front end of the chuck 5 by bolts, the outer sleeve 402 is fixedly installed in the middle of the front end of the fixed plate 401, and the inner wall of the outer sleeve 402 is set as a hexagon, and the inner sleeve 403 is fixedly installed in the middle of the rear end of the fixed plate 401. The outer wall of the inner sleeve 403 is set as a hexagon, and the inner sleeve 403 is clamped with the front end of the chuck 5. The inner wall of the outer sleeve 402 is congruent with the inner wall of the inner sleeve 403 and is connected. The outer wall of the active drill rod 1 is fixedly installed with a rotation stop block 102, as shown in FIG. Figure 4 As shown, the stop block 102 is engaged with the inner wall of the outer sleeve 402, and the diagonal distance of the stop block 102 is smaller than the diameter of the chuck 5 after it is loosened;

[0035] The outer wall of the active drill rod 1 is provided with a limiting section 103. Figure 4 As shown, the limit section 103 is located between the female connector 104 and the stop block 102, and the limit section 103 is located in the clamping range of the chuck 5. The diameter of the limit section 103 is smaller than the minimum diameter of the chuck 5 after clamping. The outer diameter of the female connector 104 and the distance between the opposite sides of the stop block 102 are both larger than the minimum diameter of the chuck 5 after clamping. The length of the limit section 103 is larger than the clamping width of the chuck 5, so that the limit section 103 has a certain axial float in the chuck 5.

[0036] The specific implementation process is as follows:

[0037] When it is necessary to replace the active drill rod 1, the staff first starts the chuck 5 to loosen the chuck 5. At this time, the rear end cover 8 is disconnected from the main shaft 6 by turning the bolts of the rear end cover 8. The staff can quickly take out the water braid 3, the connecting shaft 2 and the active drill rod 1 from the rear end of the gearbox 7, thereby greatly simplifying the disassembly process and improving the disassembly efficiency of the staff. At the same time, the space at the rear end of the gearbox 7 is ample, which is convenient for the staff to disassemble the old active drill rod 1 and the connecting shaft 2, so as to quickly connect the new active drill rod 1 to the connecting shaft 2. During installation, the staff only needs to reinstall the replaced active drill rod 1, the connecting shaft 2 and the water braid 3 as a whole into the main shaft 6, and then fix the rear end cover 8 and the main shaft 6 with bolts, and finally start the chuck 5 to shrink it and locate it in the limit section 103, but do not act on the outer wall of the limit section 103, thereby completing the replacement of the active drill rod 1.

[0038] When it is necessary to switch to the chuck 5 to clamp the salvage drill rod for work, the staff repeats the above disassembly process. During installation, it is only necessary to install the salvage drill rod from the rear end of the gearbox 7 into the main shaft 6, and pass it through the chuck 5 and the front end cover 4 in sequence, and finally start the chuck 5 to clamp the salvage drill rod and rotate it.

[0039] The entire disassembly process is completed at the rear end of the gearbox 7 where there is ample space, and only the rear end cover 8 needs to be removed to remove the active drill rod 1, the connecting shaft 2 and the water braid 3 as a whole from the main shaft 6, which greatly reduces the operating difficulty of the staff and improves the construction efficiency.

[0040] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A power head structure, including a gearbox, a main shaft, a connecting shaft and a water braid, wherein the main shaft is arranged inside the gearbox, the connecting shaft is arranged inside the main shaft, the water braid is arranged at the rear end of the gearbox, and the core shaft of the water braid is connected to the end of the connecting shaft, characterized in that: An active drill rod is arranged at the front end of the connecting shaft, and a front end cover is arranged at the end of the main shaft away from the water braid. The inner wall of the front end cover is clamped with the active drill rod, and the maximum diameter of the active drill rod is smaller than the minimum diameter inside the main shaft.

2. A power head structure according to claim 1, characterized in that: The front end cover includes a fixed plate and an outer sleeve. The fixed plate is arranged at the end of the main shaft away from the water braid. The outer sleeve is arranged in the middle of the fixed plate, and the inner wall of the outer sleeve is arranged in a polygonal shape. A stop block is arranged on the outer wall of the active drill rod, and the stop block is clamped with the inner wall of the outer sleeve.

3. A power head structure according to claim 2, characterized in that: A rear end cover is provided at the end of the main shaft close to the water braid, and the rear end cover includes an integrally formed connecting sleeve and an inner ring. The connecting sleeve is provided at the end of the main shaft close to the water braid, the inner ring is located in the middle of the connecting sleeve, and the core shaft of the water braid rotates through the inner ring and is connected to the connecting shaft.

4. A power head structure according to claim 3, characterized in that: One end of the active drill pipe is arranged as a female joint, and the other end is arranged as a male joint. The female joint is connected to the connecting shaft, and the male joint is connected to the drill pipe.

5. A power head structure according to claim 4, characterized in that: A chuck is arranged between the main shaft and the front end cover, and the chuck can limit the axial position of the active drill rod.

6. A power head structure according to claim 5, characterized in that: The active drill rod is provided with a limit section, and the limit section is located between the chucks, the outer diameter of the female joint and the distance between the opposite sides of the stop block are both larger than the minimum diameter after the chuck is clamped, and the diameter of the limit section is smaller than the minimum diameter after the chuck is clamped.

7. A power head structure according to claim 6, characterized in that: The length of the limiting section is greater than the clamping width of the chuck, and the limiting section can float axially in the chuck.

8. A power head structure according to claim 7, characterized in that: The outer diameter of the female joint and the diagonal distance of the anti-rotation block are both smaller than the diameter of the chuck after it is loosened.

9. A power head structure according to claim 2, characterized in that: An inner sleeve is arranged at one end of the fixed disk close to the chuck, and the inner sleeve is arranged at one end of the chuck away from the water braid. The inner sleeve is arranged in a polygonal shape, and the inner wall of the inner sleeve is congruent with and communicated with the inner wall of the outer sleeve.

10. A power head structure according to claim 3, characterized in that: A gap is provided between the inner ring and the connecting shaft.

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