A power head structure

Abstract

The invention relates to the field of coal mine drilling machines and discloses a power head structure, comprising a gearbox, a main shaft, a connecting shaft, a water braid and a chuck, wherein the main shaft is arranged inside the gearbox, the connecting shaft is arranged inside the main shaft, the water braid is arranged at one end of the connecting shaft, the chuck is arranged at the end of the main shaft away from the water braid, the end of the chuck away from the water braid is provided with a front end cover, the chuck and the front end cover are jointly provided with an active drill rod, and the chuck can axially limit the active drill rod, the front end cover can drive the active drill rod to rotate, the active drill rod is connected to the end of the connecting shaft away from the water braid, and the active drill rod can pass through the front end cover, the chuck and the main shaft; when the active drill rod needs to be disassembled, it only needs to loosen the chuck, the active drill rod, the connecting shaft and the water braid can be quickly taken out of the rear end of the gearbox, and then the new active drill rod, the connecting shaft and the water braid can be installed in the main shaft, thereby completing the replacement of the active drill rod, reducing the uncontrollable factors in the replacement process and increasing the construction efficiency.

Description

Technical Field

[0001] The invention relates to the field of coal mine drilling rigs, and 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 first, 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. Summary of the invention

[0005] The present invention is intended to provide a power head structure to solve the problem that when the active drill rod needs to be replaced, it is inconvenient to pull out the active drill rod, which easily affects the construction efficiency.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a power head structure, including a gearbox, a main shaft, a connecting shaft, a water braid and a chuck, the main shaft is arranged inside the gearbox, the connecting shaft is arranged inside the main shaft, the water braid is arranged at one end of the connecting shaft, the chuck is arranged at the end of the main shaft away from the water braid, the end of the chuck away from the water braid is provided with a front end cover, the chuck and the front end cover are jointly provided with an active drill rod, and the chuck can axially limit the active drill rod, the front end cover can drive the active drill rod to rotate, the active drill rod is connected to the end of the connecting shaft away from the water braid, and the active drill rod can pass through the front end cover, the chuck and the main shaft.

[0007] The beneficial effects of this solution are as follows: in a directional drilling rig power head disclosed in the existing patent (publication number: CN116905958A), when it is necessary to replace the active drill rod, the staff needs to first remove the front end cover and then unlock the active drill rod. Since one end of the connecting shaft is threadedly connected to the active drill rod and the other end is threadedly connected to the core shaft of the water braid, when the staff rotates the active drill rod to unlock it, the active drill rod and the connecting shaft cannot be accurately unlocked, and it is possible that the connecting shaft and the core shaft of the water braid are unlocked. Since the space from the front end of the chuck to the clamp is very limited, in the narrow operating space, even if the active drill rod is taken out alone, it will bring difficulty to the staff's operation. If the connecting shaft and the core shaft of the water braid are unlocked, the staff will It becomes very difficult for personnel to take out the active drill rod and the connecting shaft from the front end. At the same time, if it is necessary to switch to the chuck to clamp the salvage drill rod for work, the personnel need to remove the water braid from the rear end of the gearbox, take out the water braid and the connecting shaft from the rear end of the gearbox, and then remove the end cover to take out the active drill rod. In this process, it cannot be ensured that the connecting shaft is unlocked from the active drill rod. If the connecting shaft is unlocked from the core shaft of the water braid, the personnel also need to take out the active drill rod and the connecting shaft from the front end of the gearbox together before the salvage drill rod can be loaded into the chuck and switched to the chuck clamping for work. Therefore, whether it is to replace the active drill rod or to switch the chuck to clamp the salvage drill rod for work, it is very difficult in the prior art, which seriously affects the construction efficiency.

[0008] In this solution, when the active drill rod needs to be replaced, due to the wide operating space at the rear end of the gearbox, the staff only needs to loosen the chuck first, and then take out the water braid, the connecting shaft and the active drill rod from the rear end of the gearbox, so as to quickly replace the damaged active drill rod, and then install the new active drill rod, the connecting shaft and the water braid into the gearbox from the rear end of the gearbox, and make the active drill rod pass through the main shaft, the chuck and the front end cover in turn, so as to quickly complete the replacement of the active drill rod, reduce the uncontrollable factors in the replacement process, and increase the construction efficiency. When it is necessary to switch to the salvage drill rod 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 into the main shaft, and pass it through the chuck and the front end cover in turn, and finally clamp the salvage drill rod through the chuck to rotate. At the same time, a part of the active drill rod of the technical solution is located in the chuck and the main shaft, so that when the main shaft drives the active drill rod to rotate through the chuck, the rotation of the active drill rod is more stable and can be more accurately docked with the drill rod.

[0009] Preferably, as an improvement, one end of the active drill rod is set as a male joint, and the other end is set as a female joint, the male joint is connected to the drill rod, and the female joint is connected to the connecting shaft, and the outer diameter of the female joint is smaller than the diameter after the chuck is loosened.

[0010] 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.

[0011] Preferably, as an improvement, the front end cover includes a fixed cover and an outer sleeve, the fixed cover is arranged at the end of the chuck away from the water braid, the outer sleeve is arranged in the middle of the fixed cover, 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, and the diagonal distance of the stop block is smaller than the diameter of the chuck after it is loosened.

[0012] The beneficial effect is: the anti-rotation 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 chuck drives the front end cover to rotate, the active drill rod rotates synchronously, and the diagonal distance of the anti-rotation block is smaller than the diameter of the chuck after it is loosened, which facilitates the removal of the active drill rod from the chuck.

[0013] Preferably, as an improvement, a limited position section is provided on the outer wall of the active drill rod, and the limited position section is located in the clamping range of the chuck.

[0014] The beneficial effect is that the active drill rod is limited by the mutual cooperation between the chuck and the limiting section, so as to prevent the active drill rod from axial displacement during drilling, thereby causing the water braid and the connecting shaft to be damaged by axial impact, thus affecting the construction efficiency.

[0015] Preferably, as an improvement, the diameter of the limiting section is smaller than the minimum diameter of the chuck after clamping.

[0016] The beneficial effect is that since the diameter of the limit 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, thus avoiding the active drill rod directly bearing the strong clamping force of the chuck and increasing the service life of the active drill rod.

[0017] Preferably, as an improvement, the outer diameter of the female connector and the distance between opposite sides of the stop block are both larger than the minimum diameter after the chuck is clamped.

[0018] The beneficial effect is that the active drill rod can be axially limited by the female joint and the stop block without changing the structure of the active drill rod, which neither destroys the overall strength of the active drill rod nor can the active drill rod be axially limited.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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, thereby preventing damage to the parts inside the water braid.

[0023] Preferably, as an improvement, the middle portion of the inner ring is arranged as a hexagonal hole, and the outer wall of the core shaft of the water braid is arranged as a hexagon that is engaged with the hexagonal hole.

[0024] The beneficial effect is that the inner ring is clamped with the core shaft of the water braid, so that the overall rotation of the core shaft, the connecting shaft and the active drill rod is more stable.

[0025] Preferably, as an improvement, one end of the connecting shaft close to the active drill rod is provided with an external thread, and one end of the connecting shaft close to the water braid is provided with a female thread.

[0026] The beneficial effect is: by setting the end of the connecting shaft close to the water braid as a female thread, the connecting shaft can be axially limited by the inner ring to prevent axial displacement of the connecting shaft. The other end of the connecting shaft is set as a male thread, which can increase the stability of the connecting shaft transmission and also increase the stability of the connection with the active drill pipe and the water braid core shaft.

[0027] Preferably, as an improvement, a certain gap is provided between the inner ring and the connecting shaft.

[0028] The beneficial effect is that by setting a gap between the inner ring and the connecting shaft, the active drill pipe, 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 pipe and the drill pipe are connected or disconnected, and preventing the connecting shaft from hitting the inner ring and causing damage.

[0029] Preferably, as an improvement, an inner sleeve is provided at one end of the fixed cover close to the chuck, and the inner sleeve is clamped with the end of the chuck away from the water braid, the outer wall of the inner sleeve is set to a polygon, and the inner wall of the outer sleeve is congruent with and connected to the inner wall of the inner sleeve.

[0030] 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.

[0031] Preferably, as an improvement, the rear end cover is provided with a plurality of waist-shaped holes, and the rear end cover is fixedly mounted on one end of the main shaft through bolts and the waist-shaped holes.

[0032] The beneficial effect is that the waist-shaped hole is provided in the rear end cover, so that the rear end cover and the main shaft can be docked and fixed by bolts, so that the staff can disassemble the rear end cover conveniently.

[0033] Preferably, as an improvement, a through hole is provided inside the connecting shaft.

[0034] The beneficial effect is that a through hole is arranged inside the connecting shaft for transmitting the pressure medium required for drilling, for deslagging the borehole and cooling the active drill rod.

[0035] Preferably, as an improvement, the fixing cover is configured as a flange.

[0036] The beneficial effect is that by setting the fixing cover as a flange and fixing it by bolts, the stability of the clamping connection between the active drill rod and the outer sleeve can be increased, and the active drill rod can be prevented from relative sliding.

[0037] Preferably, as an improvement, the chuck is configured as a normally open chuck.

[0038] The beneficial effect is that the normally open chuck can realize the disassembly of the active drill rod and the connecting shaft during shutdown, thereby improving the efficiency of disassembly and assembly of the active drill rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a structural schematic diagram of a power head according to an embodiment of the present invention;

[0040] Figure 2 A schematic diagram of the structure of a rear end cover according to an embodiment of the present invention;

[0041] Figure 3 This is a schematic structural diagram of a gap M according to an embodiment of the present invention;

[0042] Figure 4 A schematic structural diagram of an active drill rod according to an embodiment of the present invention;

[0043] Figure 5 It is a schematic structural diagram of the front end cover and the inner sleeve according to an embodiment of the present invention. DETAILED DESCRIPTION

[0044] The following is further described in detail through specific implementation methods:

[0045] 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 cover 401, outer sleeve 402, inner sleeve 403, chuck 5, main shaft 6, gearbox 7, rear end cover 8, connecting sleeve 9, inner ring 10.

[0046] Example

[0047] The embodiment is basically as shown in the attached Figure 1-5 As shown, Figure 1 A power head structure shown in the figure includes a gearbox 7, a main shaft 6, a connecting shaft 2, a water braid 3 and a chuck 5. The chuck 5 is set as a normally open chuck. The main shaft 6 is rotatably installed inside the gearbox 7. The connecting shaft 2 is rotatably installed inside the main shaft 6. A through hole is provided inside the connecting shaft 2, and 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 provided with a rear end cover 8, and 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 part 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. Figure 3As shown, there is a gap M between the inner ring 10 and the connecting shaft 2, the chuck 5 is fixedly installed on the right end of the main shaft 6 by bolts, and the right end of the chuck 5 is provided with a front cover 4, and the active drill rod 1 is installed at the chuck 5 and the front cover 4 for rotation together, as shown in FIG. 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, and the front end cover 4 can drive the active drill rod 1 to rotate, and the front end cover 4 includes a fixed cover 401 and an outer sleeve 402, as shown in FIG. Figure 5 As shown, the fixed cover 401 is set as a flange and 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 cover 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 cover 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;

[0048] 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.

[0049] The specific implementation process is as follows:

[0050] 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. Then 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 make it shrink and be located in the limit section 103, but not act on the outer wall of the limit section 103, thereby completing the replacement of the active drill rod 1.

[0051] 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.

[0052] 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.

[0053] The above is only an embodiment of the present invention, 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 present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention 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, a water braid and a chuck, wherein the main shaft is arranged inside the gearbox, the connecting shaft is arranged inside the main shaft, the water braid is arranged at one end of the connecting shaft, and the chuck is arranged at the end of the main shaft away from the water braid, characterized in that: A front end cover is provided at the end of the chuck away from the water braid, and an active drill rod is jointly provided at the chuck and the front end cover, and the chuck can axially limit the active drill rod, and the front end cover can drive the active drill rod to rotate, and the active drill rod is connected to the end of the connecting shaft away from the water braid, and the active drill rod can pass through the front end cover, the chuck and the main shaft, and the front end cover includes a fixed cover and an outer sleeve, the fixed cover is arranged at the end of the chuck away from the water braid, the outer sleeve is arranged in the middle of the fixed cover, and the inner wall of the outer sleeve is arranged to be a polygon, and 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, and the diagonal distance of the stop block is smaller than the diameter of the chuck after it is loosened.

2. A power head structure according to claim 1, characterized in that: One end of the active drill pipe is set as a male joint, and the other end is set as a female joint. The male joint is connected to the drill pipe, and the female joint is connected to the connecting shaft. The outer diameter of the female joint is smaller than the diameter after the chuck is loosened.

3. A power head structure according to claim 2, characterized in that: A limiting section is arranged on the outer wall of the active drill rod, the limiting section is located between the female joint and the anti-rotation block, and the limiting section is located in the clamping range of the chuck.

4. A power head structure according to claim 3, characterized in that: The diameter of the limiting section is smaller than the minimum diameter of the chuck after clamping.

5. A power head structure according to claim 4, characterized in that: The outer diameter of the female joint and the distance between opposite sides of the stop block are both greater than the minimum diameter after the chuck is clamped.

6. A power head structure according to claim 5, 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.

7. A power head structure according to claim 1, 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 integrated 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.

8. A power head structure according to claim 7, characterized in that: The middle part of the inner ring is arranged as a hexagonal hole, and the outer wall of the core shaft of the water braid is arranged as a hexagonal shape which is clamped with the hexagonal hole.

9. A power head structure according to claim 1, characterized in that: One end of the connecting shaft close to the active drill pipe is arranged with an external thread, and one end of the connecting shaft close to the water braid is arranged with a female thread.

10. A power head structure according to claim 8, characterized in that: A gap is provided between the inner ring and the connecting shaft.

11. A power head structure according to claim 1, characterized in that: An inner sleeve is provided at one end of the fixed cover close to the chuck, the outer wall of the inner sleeve is set to a polygon, and the inner sleeve is clamped with the end of the chuck away from the water braid, and the inner wall of the outer sleeve is congruent with and connected to the inner wall of the inner sleeve.

12. A power head structure according to claim 7, characterized in that: The rear end cover is provided with a plurality of waist-shaped holes, and the rear end cover is fixedly mounted on one end of the main shaft through bolts and the waist-shaped holes.

13. A power head structure according to claim 1, characterized in that: A through hole is arranged inside the connecting shaft.

14. A power head structure according to claim 1, characterized in that: The fixed cover is arranged as a flange.

15. A power head structure according to claim 1, characterized in that: The chuck is set as a normally open chuck.

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