Screw drilling tool with quick-change and three-way position adjustable centralizer

Abstract

The invention relates to the technical field of screw drilling tools, in particular to a screw drilling tool with a quick-change and three-way position adjustable centralizer, which comprises a transmission shaft upper shell, a transmission shaft lower shell and a transmission shaft, the transmission shaft upper shell and the transmission shaft lower shell are connected up and down, and the transmission shaft upper shell is sleeved with an adjusting sleeve. A sliding groove is formed in the outer wall of the adjusting sleeve in the vertical direction, a centralizing strip is installed in the sliding groove, a first inclined face and a second inclined face are arranged at the upper end and the lower end of the centralizing strip respectively, an upper coarse adjustment pressing block is adjustably installed on the portion, on the upper side of the centralizing strip, of the sliding groove, and a third inclined face attached to the first inclined face in a sliding mode is arranged at the lower end of the upper coarse adjustment pressing block. A lower coarse adjustment pressing block is adjustably mounted on the lower side of the centralizing strip in the sliding groove, and the upper end of the lower coarse adjustment pressing block is arranged to be a fourth inclined surface which is in sliding fit with the second inclined surface; radial adjusting pieces are detachably arranged between the centralizing strips and the bottoms of the sliding grooves. The problem that a centralizing strip of an existing screw drill transmission shaft assembly centralizer cannot be quickly replaced after being abraded is solved.

Description

Technical Field

[0001] The invention relates to the technical field of screw drill tools, and in particular to a screw drill tool with a centralizer having quick-change and three-way position adjustable functions. Background Art

[0002] The screw drill is mainly composed of five parts: the transmission shaft assembly, the universal shaft assembly, the bent housing assembly, the motor assembly and the anti-drop assembly. The outer shell of the transmission shaft assembly of the screw drill is a centralizer, which is made into different structures and sizes according to different wellbore sizes.

[0003] The centralizer is mainly divided into an integrated centralizer and a replaceable centralizer, in which the replaceable centralizer is connected to the drive shaft assembly by a thread. The centralizer's centralizer bar is a key part of the centralizer, which has the functions of centralization and wear resistance. The centralizer centralizer bars are classified according to different wear-resistant layers, mainly divided into three forms: wear-resistant cladding layer, carbide wear-resistant block and heat-stable polycrystalline wear-resistant block. Regardless of the wear-resistant form of the centralizer bar, the three types of wear-resistant bars of the existing integrated centralizer and replaceable centralizer will experience eccentric wear during use. Eccentric wear of the centralizer in the well will affect the deflection ability of the screw drill. If the centralizer fails due to eccentric wear, it needs to be replaced.

[0004] However, the existing centralizer structure, whether it is an integrated centralizer or a replaceable centralizer, can only be returned to the factory for disassembly, repair and replacement once eccentric wear failure occurs.

[0005] The existing screw drill transmission shaft assembly centralizers have obvious deficiencies, which are mainly manifested as follows: 1. The centralizer's straightening strip cannot be quickly replaced after being worn; 2. The outer diameter of the centralizer's straightening bar cannot be adjusted; 3. The axial position of the centralizer's straightening bar cannot be adjusted; 4. The eccentric straightening strip of the straightener cannot be adjusted circumferentially; 5. The centralizer is difficult to process, repair and disassemble; 6. The production, use and repair costs of centralizers are high. Summary of the invention

[0006] The purpose of the present invention is to provide a screw drill with a centralizer having quick-change and three-way position adjustable functions, so as to solve the problem that the centralizer strip of the existing screw drill transmission shaft assembly centralizer cannot be quickly replaced after being worn.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: A screw drill with a centralizer with quick-change and three-way position adjustable functions, comprising an anti-drop assembly, a motor assembly, a bent housing assembly, a universal shaft assembly and a transmission shaft assembly arranged in sequence from top to bottom, the transmission shaft assembly comprising an upper transmission shaft housing and a lower transmission shaft housing connected up and down, and a transmission shaft rotatably arranged in the upper transmission shaft housing and the lower transmission shaft housing, an adjustment sleeve is installed on the outer sleeve of the upper transmission shaft housing, a slide groove is arranged on the outer wall of the adjustment sleeve along the up and down directions, a straightening bar is installed in the slide groove, the outer side of the straightening bar protrudes from the slide groove, and the straightening bar A first inclined surface and a second inclined surface are respectively provided at the upper and lower ends, the first inclined surface is inclined downward from the bottom of the slide groove to the groove mouth, and the second inclined surface is inclined upward from the bottom of the slide groove to the groove mouth. The slide groove is adjustably installed with an upper coarse adjustment pressure block on the upper side of the straightening bar, and the lower end of the upper coarse adjustment pressure block is set to a third inclined surface that slides with the first inclined surface. The slide groove is adjustably installed with a lower coarse adjustment pressure block on the lower side of the straightening bar, and the upper end of the lower coarse adjustment pressure block is set to a fourth inclined surface that slides with the second inclined surface; a radial adjustment sheet is detachably provided between the straightening bar and the groove bottom of the slide groove.

[0008] A further technical solution is that the upper groove wall and the lower groove wall of the slide groove are respectively connected with the upper end and the lower end of the adjusting sleeve, and the upper shell of the transmission shaft is provided with a locking nut on the upper side threaded sleeve of the adjusting sleeve, and the lower end of the locking nut is inclined downward from the inner wall to the outer wall to form a first conical surface, and the upper end of the upper coarse adjustment pressure block is set to be a second conical surface that slides in contact with the first conical surface, and a support ring is formed by the outer wall protrusion surrounding the lower end of the lower shell of the transmission shaft, and the lower end of the adjusting sleeve is in contact with the upper side of the support ring, and the upper side of the support ring is provided with a projection that extends into the slide groove at the position corresponding to the slide groove. A support block is provided on the support block, the upper end of the adjusting screw hole is connected with the upper side of the support block, and the lower end extends to be connected with the lower side of the support ring, the inner thread of the adjusting screw hole is matched and connected with a fine-tuning screw, and a fine-tuning pressure block is provided in the slide groove between the lower coarse adjustment pressure block and the support block, the lower side of the lower coarse adjustment pressure block is set as a fifth inclined surface parallel to the second inclined surface, the upper end of the fine-tuning pressure block is set as a sixth inclined surface slidingly fitted with the fifth inclined surface, and a support rod is provided on the lower side of the lower coarse adjustment pressure block, the support rod passes through the adjusting screw hole and is connected with the upper end of the fine-tuning screw.

[0009] A further technical solution is that the adjusting screw hole is thread-matchedly connected with a sealing screw below the fine-tuning screw.

[0010] A further technical solution is that the outer wall of the transmission shaft and the upper shell of the transmission shaft are rotatably connected via a composite sheet bearing.

[0011] A further technical solution is that the composite sheet bearing includes a bearing inner ring, an upper bearing outer ring and a lower bearing outer ring. The inner wall of the bearing inner ring is fitted with the outer wall of the transmission shaft. A sliding ring is formed around the middle part of the outer wall of the bearing inner ring and bulges outward. The upper bearing outer ring is sleeved on the outer wall of the bearing inner ring on the upper side of the sliding ring, and the lower side of the upper bearing outer ring is slidingly fitted with the upper side of the sliding ring. The lower bearing outer ring is sleeved on the outer wall of the bearing inner ring on the lower side of the sliding ring, and the upper side of the lower bearing outer ring is slidingly fitted with the lower side of the sliding ring. The outer rings of the upper bearing outer ring and the lower bearing outer ring are both fitted with the inner wall of the upper housing of the transmission shaft.

[0012] A further technical solution is that a first ring groove is provided in the upper recess of the sliding ring, a second ring groove is provided in the lower recess, a third ring groove aligned with the first ring groove is provided in the lower recess of the upper bearing outer ring, a fourth ring groove aligned with the second ring groove is provided in the upper recess of the lower bearing outer ring, an upper composite sheet group is filled between the first and third ring grooves, and a lower composite sheet group is filled between the second and fourth ring grooves.

[0013] A further technical solution is that the inner wall of the upper shell of the transmission shaft has a support portion protruding inward above the outer ring of the upper bearing, and the lower side of the support portion is in contact with the upper side of the outer ring of the upper bearing through an upper disc spring group; the upper end of the lower shell of the transmission shaft is connected to a support ring on the inner side of the upper shell of the transmission shaft, and the upper side of the support ring and the lower side of the outer ring of the lower bearing are in contact with each other through a lower disc spring group.

[0014] A further technical solution is that the upper housing of the transmission shaft and the transmission shaft are rotatably connected on the upper side of the composite plate bearing through the upper radial bearing static sleeve and the upper radial bearing dynamic sleeve, the outer wall of the upper radial bearing static sleeve is fitted with the inner wall of the upper housing of the transmission shaft, the upper radial bearing dynamic sleeve is fitted with the outer wall of the transmission shaft, and the outer wall of the upper radial bearing dynamic sleeve is rotatably fitted with the inner wall of the upper radial bearing static sleeve; an installation ring groove is provided on the inner wall surrounding the upper end of the upper housing of the transmission shaft, an elastic retaining ring for the hole is installed in the installation ring groove, and the upper end of the upper radial bearing static sleeve is in contact with the lower side of the elastic retaining ring for the hole.

[0015] A further technical solution is that a lower radial bearing sleeve is provided on the outer wall near the lower end of the transmission shaft, and the inner wall of the lower end of the lower radial bearing sleeve is threadedly connected to the outer wall of the lower end of the transmission shaft; an anti-drop ring is installed at the upper end of the lower radial bearing sleeve of the transmission shaft, the inner wall of the lower end of the anti-drop ring is fixed to the transmission shaft by a threaded connection, and the inner wall of the upper end of the lower radial bearing sleeve is connected to the outer wall of the lower end of the anti-drop ring by a clamping strip; the anti-drop ring protrudes outward above the lower radial bearing sleeve to form a first limiting ring, and the inner wall of the lower shell of the transmission shaft protrudes inward below the first limiting ring to form a second limiting ring matching the first limiting ring, and the outer diameter of the first limiting ring is larger than the inner diameter of the second limiting ring. Compared with the prior art, the beneficial effects of the present invention are as follows: 1. When a certain straightening bar is excessively worn during use, causing it to fail to work normally, a radial adjustment plate of appropriate thickness is added between the straightening bar and the bottom of the slide groove to increase the portion of the straightening bar protruding from the slide groove, thereby compensating for the portion of the straightening bar worn due to use. After the adjustment is completed, the straightening bar is fixed by the cooperation of the upper rough pressing block and the lower rough pressing block; 2. Through the cooperation of the first inclined surface and the third inclined surface, as well as the cooperation of the second inclined surface and the fourth inclined surface, after the upper rough pressing block and the lower rough pressing block are fixed, the up and down movement of the straightening bar can be well limited, thereby improving the firmness of the installation of the straightening bar; 3. Improvement of the previous maintenance of the straightening bar The present invention can enable technicians to quickly complete the adjustment or replacement of the straightening bar at the construction site by adjusting and adjusting a small number of accessories, thus avoiding construction delays due to maintenance; 4. The quick-change function of the straightening bar can extend the service life of the screw drilling tool in the well; 5. The straightening bar is adjustable in three directions, that is, the upper and lower positions and the radial position of the outer diameter of the straightening bar can be adjusted by the upper and lower coarse pressing blocks to improve the deflection capacity of the screw; 6. The new straightener structure is easy to produce, repair and disassemble, and the management cost is reduced; 7. The problem that the outer diameter of the straightening bar cannot be adjusted in the prior art is solved; 8. The problem that the axial position of the straightening bar cannot be adjusted in the prior art is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The overall schematic diagram of a screw drill with a centralizer having quick-change and three-way position adjustable functions according to the present invention.

[0017] Figure 2 The present invention is a side view of a transmission shaft assembly of a screw drill with a centralizer having quick-change and three-way position adjustable functions.

[0018] Figure 3 The present invention is a cross-sectional schematic diagram of a transmission shaft assembly of a screw drill having a centralizer with quick-change and three-way position adjustable functions.

[0019] Figure 4 The present invention is a cross-sectional schematic diagram of a screw drill transmission shaft assembly having a centralizer with quick-change and three-way position adjustable functions.

[0020] Figure 5 for Figure 3 A partial enlarged schematic diagram of the area marked A in the middle.

[0021] Figure 6 for Figure 3 A partial enlarged schematic diagram of the area marked B in the middle.

[0022] Figure 7 for Figure 3 A partial enlarged schematic diagram of the area marked C in the middle.

[0023] Icons: 1-anti-drop assembly, 2-motor assembly, 3-bend housing assembly, 4-universal shaft assembly, 5-drive shaft assembly, 6-drive shaft upper housing, 7-drive shaft lower housing, 8-drive shaft, 9-adjusting sleeve, 10-slide, 11-straightening bar, 12-first inclined plane, 13-second inclined plane, 14-upper coarse adjustment pressure block, 15-third inclined plane, 16-lower coarse adjustment pressure block, 17-fourth inclined plane, 18-radial adjustment plate, 19-locking nut, 20-first cone surface, 21-second cone surface, 22-support block, 23-adjusting screw hole, 24-fine-tuning screw, 25-fine-tuning pressure block, 2 6-fifth inclined plane, 27-sixth inclined plane, 28-support rod, 29-sealing screw, 30-bearing inner ring, 31-upper bearing outer ring, 32-lower bearing outer ring, 33-sliding ring, 34-upper composite plate group, 35-lower composite plate group, 36-support part, 37-upper disc spring group, 38-support ring, 39-lower disc spring group, 40-upper radial bearing static sleeve, 41-upper radial bearing dynamic sleeve, 42-mounting ring groove, 43-elastic retaining ring for hole, 44-lower radial bearing dynamic sleeve, 45-anti-drop ring, 46-card strip, 47-first limiting ring, 48-second limiting ring, 49-support ring. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] Figures 1 to 7 The embodiment of the present invention is shown in the accompanying drawings. The screw drill is placed horizontally, that is, the upper end in the embodiment is the left end shown in the drawings, and the lower end is the right end shown in the drawings.

[0026] Example: A screw drill with a centralizer with quick-change and three-way position adjustable functions, comprising an anti-drop assembly 1, a motor assembly 2, a bent housing assembly 3, a universal shaft assembly 4 and a transmission shaft assembly 5 arranged in sequence from top to bottom, the transmission shaft assembly 5 comprising an upper transmission shaft housing 6 and a lower transmission shaft housing 7 connected up and down, and a transmission shaft 8 rotatably arranged in the upper transmission shaft housing 6 and the lower transmission shaft housing 7, an outer sleeve of the upper transmission shaft housing 6 is provided with an adjustment sleeve 9, an outer wall of the adjustment sleeve 9 is provided with a slide groove 10 in the up and down direction, a straightening bar 11 is installed in the slide groove 10, the outer side of the straightening bar 11 protrudes from the slide groove 10, and the upper and lower ends of the straightening bar 11 are respectively provided with A first inclined surface 12 and a second inclined surface 13 are provided, the first inclined surface 12 is inclined downward from the bottom of the slide groove 10 to the groove mouth, and the second inclined surface 13 is inclined upward from the bottom of the slide groove 10 to the groove mouth. The slide groove 10 is adjustably installed with an upper coarse adjustment pressure block 14 on the upper side of the straightening bar 11, and the lower end of the upper coarse adjustment pressure block 14 is set to a third inclined surface 15 that slides with the first inclined surface 12. The slide groove 10 is adjustably installed with a lower coarse adjustment pressure block 16 on the lower side of the straightening bar 11, and the upper end of the lower coarse adjustment pressure block 16 is set to a fourth inclined surface 17 that slides with the second inclined surface 13; a radial adjustment sheet 18 is detachably provided between the straightening bar 11 and the groove bottom of the slide groove 10. When a certain straightening bar 11 is excessively worn during use, causing it to fail to work properly, a radial adjustment sheet 18 of appropriate thickness is added between the straightening bar 11 and the bottom of the chute 10 to increase the portion of the straightening bar 11 protruding from the chute 10, thereby compensating for the portion of the straightening bar 11 worn due to use. After the adjustment is completed, the straightening bar 11 is fixed by the upper coarse adjustment pressure block 14 and the lower coarse adjustment pressure block 16. Through the cooperation of the first inclined surface 12 and the third inclined surface 15, and the cooperation of the second inclined surface 13 and the fourth inclined surface 17, after the upper coarse adjustment pressure block 14 and the lower coarse adjustment pressure block 16 are fixed, the up and down movement of the straightening bar 11 can be well limited, thereby improving the firmness of the installation of the straightening bar 11. In the past, the repair and replacement of the straightening bar 11 required returning to the factory for repair. The present invention can quickly complete the adjustment or replacement of the straightening bar 11 at the construction site by adjusting and adjusting a small number of accessories, avoiding the delay of the construction period caused by repair. The quick-change function of the straightening bar 11 can extend the service life of the screw drilling tool in the well. The straightening bar 11 is adjustable in three directions, that is, the upper and lower positions and the radial position of the outer diameter of the straightening bar 11 can be adjusted by the upper coarse adjustment pressure block 14 and the lower coarse adjustment pressure block 16 to improve the deflection capacity of the screw. The new straightening device structure is easy to produce, repair and disassemble, and the management cost is reduced. The problem that the outer diameter of the straightening bar 11 in the prior art cannot be adjusted is solved. The problem that the axial position of the straightening bar 11 in the prior art cannot be adjusted is solved.

[0027] The upper groove wall and the lower groove wall of the slide groove 10 are respectively connected with the upper end and the lower end of the adjusting sleeve 9. The upper housing 6 of the transmission shaft is provided with a locking nut 19 on the upper side of the adjusting sleeve 9. The lower end of the locking nut 19 is inclined downward from the inner wall to the outer wall to form a first conical surface 20. The upper end of the upper coarse adjustment pressure block 14 is set to a second conical surface 21 that slides and fits with the first conical surface 20. The outer wall protrusion surrounding the lower end of the lower housing 7 of the transmission shaft is formed with a support ring 49. The lower end of the adjusting sleeve 9 and the upper side of the support ring 49 are in contact with each other. The upper side of the support ring 49 is provided with a support block 22 extending into the slide groove 10 at the position corresponding to the slide groove 10. The support block 22 is provided An adjusting screw hole 23 is provided, the upper end of the adjusting screw hole 23 is connected to the upper side of the support block 22, and the lower end extends to be connected to the lower side of the support ring 49. The inner thread of the adjusting screw hole 23 is matched with a fine-tuning screw 24. The slide 10 is provided with a fine-tuning pressure block 25 between the lower coarse adjustment pressure block 16 and the support block 22. The lower side of the lower coarse adjustment pressure block 16 is provided with a fifth inclined surface 26 parallel to the second inclined surface 13. The upper end of the fine-tuning pressure block 25 is provided with a sixth inclined surface 27 slidingly fitted with the fifth inclined surface 26. A support rod 28 is provided on the lower side of the lower coarse adjustment pressure block 16. The support rod 28 passes through the adjusting screw hole 23 and is connected to the upper end of the fine-tuning screw 24. When the screw drill needs to replace the eccentric straightener, only the straightening strip 11 in the corresponding direction needs to be replaced. That is, loosen the locking nut 19 and the fine adjustment screw 24 in sequence, move the upper coarse adjustment pressure block 14 and the lower coarse adjustment pressure block 16, install the wider straightening bar 11, and then tighten the locking nut 19 and the fine adjustment screw 24 in sequence, and finally tighten the locking nut 19. When the screw drill straightener requires different deflection capabilities, it is only necessary to interchange the positions of the upper coarse adjustment pressure block 14 and the lower coarse adjustment pressure block 16 of different lengths, or replace the upper coarse adjustment pressure block 14 and the lower coarse adjustment pressure block 16 of different thicknesses. That is, loosen the locking nut 19 and the sealing screw 29 in sequence, replace and move the upper coarse adjustment pressure block 14 and the lower coarse adjustment pressure block 16, reinstall the straightening bar 11, and then tighten the locking nut 19 and the fine adjustment screw 24 in sequence, and finally tighten the locking nut 19. When the screw drill straightener is worn eccentrically, it is only necessary to add a radial adjustment sheet 18, and replace the upper coarse adjustment pressure block 14 and the lower coarse adjustment pressure block 16 of different thicknesses when necessary. That is, the locking nut 19 and the sealing screw 29 are loosened in sequence, the upper coarse adjustment pressure block 14 and the lower coarse adjustment pressure block 16 are moved and replaced, the radial adjustment sheet 18 is installed, the worn straightening bar 11 is installed, and then the locking nut 19 and the fine adjustment screw 24 are tightened in sequence, and finally the locking nut 19 is tightened. With the cooperation of the first conical surface 20 and the second conical surface 21, the upper end of the upper coarse adjustment pressure block 14 can be fixed by the locking nut 19, and the lower end of the lower coarse adjustment pressure block 16 can be fixed by the cooperation of the fifth inclined surface 26 and the sixth inclined surface 27, so that when the locking nut 19 and the fine adjustment screw 24 are tightened, the upper end of the straightening bar 11 is fixed by the lower end of the upper coarse adjustment pressure block 14, and the lower end of the straightening bar 11 is fixed by the upper end of the lower coarse adjustment pressure block 16.

[0028] The adjusting screw hole 23 is threadedly matched with a sealing screw 29 below the fine-tuning screw 24. By providing the sealing screw 29, the adjusting screw hole 23 can be sealed, the impact of mud on the fine-tuning screw 24 can be reduced, the fine-tuning screw 24 can be protected, and the fine-tuning screw 24 can be prevented from loosening.

[0029] The outer wall of the transmission shaft 8 and the transmission shaft upper shell 6 are rotatably connected via a composite sheet bearing.

[0030] The composite sheet bearing includes a bearing inner ring 30, an upper bearing outer ring 31 and a lower bearing outer ring 32. The inner wall of the bearing inner ring 30 is fitted with the outer wall of the transmission shaft 8. A sliding ring 33 is formed around the middle of the outer wall of the bearing inner ring 30 and bulges outward. The upper bearing outer ring 31 is sleeved on the outer wall of the bearing inner ring 30 on the upper side of the sliding ring 33, and the lower side of the upper bearing outer ring 31 is slidingly fitted with the upper side of the sliding ring 33. The lower bearing outer ring 32 is sleeved on the outer wall of the bearing inner ring 30 on the lower side of the sliding ring 33, and the upper side of the lower bearing outer ring 32 is slidingly fitted with the lower side of the sliding ring 33. The outer rings of the upper bearing outer ring 31 and the lower bearing outer ring 32 are both fitted with the inner wall of the transmission shaft upper housing 6.

[0031] The upper recess of the sliding ring 33 is provided with a first ring groove, the lower recess is provided with a second ring groove, the lower recess of the upper bearing outer ring 31 is provided with a third ring groove aligned with the first ring groove, the upper recess of the lower bearing outer ring 32 is provided with a fourth ring groove aligned with the second ring groove, the upper composite sheet group 34 is filled between the first and third ring grooves, and the lower composite sheet group 35 is filled between the second and fourth ring grooves. By providing the first and third ring grooves, the upper composite sheet group 34 can be well fixed, and by the second and fourth ring grooves, the lower composite sheet group 35 can be well fixed. Both the upper composite sheet group 34 and the lower composite sheet group 35 adopt PDC composite sheet groups. PDC composite sheet bearings can withstand high drilling pressure and torque. In drilling operations, the screw drill needs to transmit the torque of the ground to the drill bit, and at the same time, it must withstand the reaction force of the drill bit during drilling. The cemented carbide matrix of the PDC bearing provides good strength support, while the diamond micro powder layer enhances its compressive resistance. The friction coefficient of PDC composite sheet bearings is relatively low. When the screw drill is working, the low friction coefficient helps to reduce energy loss and improve energy transfer efficiency. PDC bearings have good corrosion resistance and their structure enables them to remain stable in this corrosive environment.

[0032] The inner wall of the upper housing 6 of the transmission shaft has a support portion 36 protruding inward above the upper bearing outer ring 31, and the lower side of the support portion 36 is in contact with the upper side of the upper bearing outer ring 31 through the upper disc spring group 37; the upper end of the lower housing 7 of the transmission shaft is connected to a support ring 38 on the inner side of the upper housing 6 of the transmission shaft, and the upper side of the support ring 38 and the lower side of the lower bearing outer ring 32 are in contact with each other through the lower disc spring group 39. By providing the upper disc spring group 37, the elasticity of the upper disc spring group 37 can make the upper composite sheet group 34 fit the first ring groove and the third ring groove during operation, and at the same time, when the upper composite sheet group 34 is impacted, it plays a buffering role to prevent the upper composite sheet group 34 from being broken, thereby improving the service life of the upper composite sheet group 34. Similarly, the lower disc spring group 39 also protects the lower composite sheet group 35 to prevent it from being broken when impacted.

[0033] The transmission shaft upper shell 6 and the transmission shaft 8 are rotatably connected on the upper side of the composite sheet bearing through the upper radial bearing static sleeve 40 and the upper radial bearing dynamic sleeve 41. The outer wall of the upper radial bearing static sleeve 40 fits with the inner wall of the transmission shaft upper shell 6, the upper radial bearing dynamic sleeve 41 fits with the outer wall of the transmission shaft 8, and the outer wall of the upper radial bearing dynamic sleeve 41 and the inner wall of the upper radial bearing static sleeve 40 are rotatably fitted; an installation ring groove 42 is provided on the inner wall surrounding the upper end of the transmission shaft upper shell 6, and a hole elastic retaining ring 43 is installed in the installation ring groove 42, and the upper end of the upper radial bearing static sleeve 40 is in contact with the lower side of the hole elastic retaining ring 43. The upper radial bearing static sleeve 40 and the upper radial bearing dynamic sleeve 41 are used to fill the gap between the rotating shaft above the composite piece bearing and the upper shell 6 of the transmission shaft, thereby improving the rotation stability of the transmission shaft 8, and the upper end of the upper radial bearing dynamic sleeve 41 is limited by an elastic retaining ring, and the lower end is supported against the upper end of the bearing inner ring 30 of the composite piece bearing to limit the position of the bearing inner ring 30.

[0034] A lower radial bearing sleeve 44 is sleeved on the outer wall near the lower end of the transmission shaft 8, and the inner wall of the lower end of the lower radial bearing sleeve 44 is threadedly connected to the outer wall of the lower end of the transmission shaft 8; an anti-drop ring 45 is installed at the upper end of the lower radial bearing sleeve 44 of the transmission shaft 8, and the inner wall of the lower end of the anti-drop ring 45 is fixed to the transmission shaft 8 by threaded connection, and the inner wall of the upper end of the lower radial bearing sleeve 44 is connected to the outer wall of the lower end of the anti-drop ring 45 through a clamping strip 46; the anti-drop ring 45 protrudes outwards above the lower radial bearing sleeve 44 to form a first limiting ring 47, and the inner wall of the lower housing 7 of the transmission shaft protrudes inwards below the first limiting ring 47 to form a second limiting ring 48 that cooperates with the first limiting ring 47, and the outer diameter of the first limiting ring 47 is greater than the inner diameter of the second limiting ring 48. The first limiting ring 47 cooperates with the second limiting ring 48 to prevent the anti-drop ring 45 from falling from the lower housing 7 of the transmission shaft. The inner wall of the anti-drop ring 45 is connected to the transmission shaft 8 by a threaded connection. When the upper part of the transmission shaft 8 breaks, the anti-drop ring 45 can be used to prevent the broken part of the transmission shaft 8 from falling out from the lower end of the transmission shaft lower housing 7 and falling into the borehole, which needs to be salvaged, wasting manpower and material resources. The lower radial bearing sleeve 44 can fill the gap between the transmission shaft 8 and the transmission shaft lower housing 7 to improve the rotation stability of the transmission shaft 8. At the same time, the lower radial bearing sleeve 44 is threadedly connected to the position near the lower end of the transmission shaft 8, and the lower radial bearing sleeve 44 and the anti-drop ring 45 are connected together with the clamping strip 46. When the lower part of the transmission shaft 8 breaks, the anti-drop ring 45 can still be used to prevent the broken part from falling into the borehole.

[0035] Although the present invention is described herein with reference to a number of illustrative embodiments of the present invention, it will be appreciated that those skilled in the art may devise many other modifications and implementations that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the present disclosure, drawings, and claims, a variety of variations and modifications may be made to the components and / or layout of the subject combination layout. In addition to the variations and modifications made to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A screw drill with a centralizer having quick-change and three-way position adjustable functions, comprising an anti-drop assembly (1), a motor assembly (2), a bent housing assembly (3), a universal shaft assembly (4) and a transmission shaft assembly (5) arranged in sequence from top to bottom, characterized in that: The transmission shaft assembly (5) comprises an upper transmission shaft housing (6) and a lower transmission shaft housing (7) connected to each other in upper and lower directions, and a transmission shaft (8) rotatably arranged in the upper transmission shaft housing (6) and the lower transmission shaft housing (7); an adjusting sleeve (9) is mounted on the outer sleeve of the upper transmission shaft housing (6); a slide groove (10) is arranged on the outer wall of the adjusting sleeve (9) in the upper and lower directions; a straightening bar (11) is installed in the slide groove (10); the outer side of the straightening bar (11) protrudes from the slide groove (10); the upper and lower ends of the straightening bar (11) are respectively provided with a first inclined surface (12) and a second inclined surface (13); the first inclined surface (12) is formed by the groove of the slide groove (10); The second inclined surface (13) is inclined upward from the bottom of the slide groove (10) to the groove mouth, the slide groove (10) is adjustable on the upper side of the straightening bar (11) to have an upper coarse adjustment pressure block (14), the lower end of the upper coarse adjustment pressure block (14) is arranged as a third inclined surface (15) which is slidably fitted with the first inclined surface (12), the slide groove (10) is adjustable on the lower side of the straightening bar (11) to have a lower coarse adjustment pressure block (16), the upper end of the lower coarse adjustment pressure block (16) is arranged as a fourth inclined surface (17) which is slidably fitted with the second inclined surface (13); a radial adjustment sheet (18) is detachably arranged between the straightening bar (11) and the groove bottom of the slide groove (10).

2. The screw drill with a centralizer having quick-change and three-way position adjustable functions according to claim 1, characterized in that: The upper groove wall and the lower groove wall of the slide groove (10) are respectively connected to the upper end and the lower end of the adjustment sleeve (9); the upper housing (6) of the transmission shaft is provided with a locking nut (19) on the upper side of the adjustment sleeve (9) through a threaded sleeve; the lower end of the locking nut (19) is inclined downward from the inner wall to the outer wall to form a first conical surface (20); the upper end of the upper coarse adjustment pressure block (14) is provided with a second conical surface (21) that is slidably fitted with the first conical surface (20); a support ring (49) is formed around the outer wall protrusion of the lower end of the transmission shaft lower housing (7); the lower end of the adjustment sleeve (9) and the upper side of the support ring (49) are in contact with each other; the upper side of the support ring (49) is provided with a support block (22) extending into the slide groove (10) at a position corresponding to the slide groove (10); the support block (22) is provided with An adjusting screw hole (23), the upper end of the adjusting screw hole (23) is connected to the upper side of the support block (22), and the lower end extends to be connected to the lower side of the support ring (49); the inner thread of the adjusting screw hole (23) is matched and connected with a fine-tuning screw (24); the slide groove (10) is provided with a fine-tuning pressure block (25) between the lower coarse-adjusting pressure block (16) and the support block (22); the lower side of the lower coarse-adjusting pressure block (16) is provided with a fifth inclined surface (26) parallel to the second inclined surface (13); the upper end of the fine-tuning pressure block (25) is provided with a sixth inclined surface (27) slidably fitted with the fifth inclined surface (26); the lower side of the lower coarse-adjusting pressure block (16) is provided with a support rod (28); the support rod (28) penetrates into the adjusting screw hole (23) and is connected with the upper end of the fine-tuning screw (24) by contact.

3. The screw drill with a centralizer having quick-change and three-way position adjustable functions according to claim 2, characterized in that: The adjusting screw hole (23) is thread-matchedly connected with a sealing screw (29) below the fine-tuning screw (24).

4. The screw drill with a centralizer having quick-change and three-way position adjustable functions according to claim 1, characterized in that: The outer wall of the transmission shaft (8) and the transmission shaft upper housing (6) are rotatably connected via a composite sheet bearing.

5. The screw drill with a centralizer having quick-change and three-way position adjustable functions according to claim 4, characterized in that: The composite sheet bearing comprises a bearing inner ring (30), an upper bearing outer ring (31) and a lower bearing outer ring (32); the inner wall of the bearing inner ring (30) is fitted with the outer wall of the transmission shaft (8); a sliding ring (33) is formed around the middle of the outer wall of the bearing inner ring (30) and protrudes outward; the upper bearing outer ring (31) is sleeved on the outer wall of the bearing inner ring (30) at the upper side of the sliding ring (33); the lower side of the upper bearing outer ring (31) is slidably fitted with the upper side of the sliding ring (33); the lower bearing outer ring (32) is sleeved on the outer wall of the bearing inner ring (30) at the lower side of the sliding ring (33); the upper side of the lower bearing outer ring (32) is slidably fitted with the lower side of the sliding ring (33); and the outer rings of the upper bearing outer ring (31) and the lower bearing outer ring (32) are both fitted with the inner wall of the upper housing (6) of the transmission shaft.

6. The screw drill with a centralizer having quick-change and three-way position adjustable functions according to claim 5, characterized in that: The upper recess of the sliding ring (33) is provided with a first ring groove, and the lower recess is provided with a second ring groove. The lower recess of the upper bearing outer ring (31) is provided with a third ring groove aligned with the first ring groove. The upper recess of the lower bearing outer ring (32) is provided with a fourth ring groove aligned with the second ring groove. An upper composite sheet group (34) is filled between the first and third ring grooves, and a lower composite sheet group (35) is filled between the second and fourth ring grooves.

7. The screw drill with a centralizer having quick-change and three-way position adjustable functions according to claim 6, characterized in that: The inner wall of the transmission shaft upper housing (6) is provided with a support portion (36) protruding inwardly above the upper bearing outer ring (31), and the lower side of the support portion (36) is in contact with the upper side of the upper bearing outer ring (31) via an upper disc spring assembly (37); the upper end of the transmission shaft lower housing (7) is connected to a support ring (38) on the inner side of the transmission shaft upper housing (6), and the upper side of the support ring (38) is in contact with the lower side of the lower bearing outer ring (32) via a lower disc spring assembly (39).

8. The screw drill with a centralizer having quick-change and three-way position adjustable functions according to claim 1, characterized in that: The transmission shaft upper housing (6) and the transmission shaft (8) are rotatably connected on the upper side of the composite sheet bearing through an upper radial bearing static sleeve (40) and an upper radial bearing dynamic sleeve (41); the outer wall of the upper radial bearing static sleeve (40) is in contact with the inner wall of the transmission shaft upper housing (6); the upper radial bearing dynamic sleeve (41) is in contact with the outer wall of the transmission shaft (8); the outer wall of the upper radial bearing dynamic sleeve (41) is rotatably in contact with the inner wall of the upper radial bearing static sleeve (40); an installation ring groove (42) is provided around the inner wall of the upper end of the transmission shaft upper housing (6); a hole elastic retaining ring (43) is installed in the installation ring groove (42); the upper end of the upper radial bearing static sleeve (40) is in contact with the lower side of the hole elastic retaining ring (43).

9. The screw drill with a centralizer having quick-change and three-way position adjustable functions according to claim 1, characterized in that: A lower radial bearing sleeve (44) is sleeved on the outer wall near the lower end of the transmission shaft (8), and the inner wall of the lower end of the lower radial bearing sleeve (44) is threadedly connected to the outer wall of the lower end of the transmission shaft (8); an anti-drop ring (45) is installed on the transmission shaft (8) at the upper end of the lower radial bearing sleeve (44), and the inner wall of the lower end of the anti-drop ring (45) is fixed to the transmission shaft (8) by threaded connection, and the inner wall of the upper end of the lower radial bearing sleeve (44) is connected to the outer wall of the lower end of the anti-drop ring (45) by a clamping strip (46); the anti-drop ring (45) protrudes outward above the lower radial bearing sleeve (44) to form a first limiting ring (47), and the inner wall of the lower housing (7) of the transmission shaft protrudes inward below the first limiting ring (47) to form a second limiting ring (48) matched with the first limiting ring (47), and the outer diameter of the first limiting ring (47) is greater than the inner diameter of the second limiting ring (48).

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