A dual-power impact screw drill bit drive shaft assembly

Abstract

This invention provides a dual-power impact screw drill bit drive shaft assembly. This drive shaft assembly integrates the impact function into the screw motor, enabling impact rotary drilling. Mechanistically, it is suitable for hard rock drilling, and the vibration generated by the impact also facilitates the transmission of drilling pressure. This addresses the low efficiency problem of single-bend screw motors in hard rock drilling from two aspects. The dual-power impact screw drill bit drive shaft assembly of this invention can be connected to a turbine motor. Compared to screw motors, turbine motors are characterized by high speed and low torque, enabling high-speed rotation and high-frequency impact drilling. This further improves the force on the drill bit and solves the problem of drill bit jamming and stopping due to the low torque of turbine motors.

Description

Technical Field

[0001] This invention belongs to the field of drilling technology and relates to a dual-power impact screw drill bit drive shaft assembly. Background Technology

[0002] The part below the universal joint and curved housing of a single-bend screw motor is called the "drive shaft assembly," which typically functions to transmit the rotational torque generated by the screw motor to the drill bit.

[0003] The conventional single-bend screw motor in the prior art is not suitable for drilling hard rock. When drilling into hard rock layers, when the hole depth exceeds a certain depth, due to the bending of the borehole, the frictional resistance between the drill string and the hole wall is large, which affects the transmission of drilling pressure. At this time, the motor is prone to the problem of the drill bit getting stuck and stopping due to low torque, which affects the overall drilling efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a dual-power impact screw drill drive shaft assembly to solve the problem that ordinary single-bend screw motors in the prior art are unsuitable for drilling hard rock and have low drilling efficiency.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A dual-power impact screw drill bit drive shaft assembly includes an upper drive shaft and a drill bit shaft, wherein the upper drive shaft is connected to the drill bit shaft via an impact assembly.

[0007] The impact assembly includes an intermediate torsion transmission shaft; the intermediate torsion transmission shaft has an axial hole in its middle, which is closed in the middle; multiple liquid inlet channels are formed on the side wall of the front half of the intermediate torsion transmission shaft, and liquid outlet channels are formed on the side wall of the rear half of the intermediate torsion transmission shaft, the number of which is the same as the number of liquid inlet channels; the liquid inlet channels are connected to the front half of the shaft hole, and the liquid outlet channels are connected to the rear half of the shaft hole; a compression spring, a toothed sleeve, and a roller seat are sequentially sleeved on the intermediate torsion transmission shaft from the middle to the rear; the toothed sleeve is slidably sleeved on the intermediate torsion transmission shaft, and the roller seat is rotatably sleeved on the intermediate torsion transmission shaft;

[0008] The gear sleeve has multiple oblique transmission teeth evenly distributed circumferentially on one end face, and the roller seat has rollers corresponding to the transmission teeth on the end face opposite to the gear sleeve. When the roller seat rotates around the axis, the rollers can slide along the oblique surface of the transmission teeth.

[0009] The intermediate torsion shaft of the impact assembly is fitted with a bearing sleeve; the bearing sleeve is fixedly connected to the roller seat and can cover the compression spring, the gear sleeve and the roller seat.

[0010] The upper drive shaft is sequentially fitted with a first TC bearing inner sleeve and a thrust bearing;

[0011] The first TC bearing inner sleeve and the thrust bearing outer sleeve are both fitted with the first TC bearing outer sleeve;

[0012] The first TC bearing outer sleeve is connected to the front part of the bearing sleeve via a double male connector;

[0013] The drill bit shaft is fitted with a second TC bearing inner sleeve, and the second TC bearing inner sleeve is fitted with a second TC bearing outer sleeve. The rear end of the second TC bearing outer sleeve contacts the front end of the roller seat.

[0014] The front end of the compression spring is fixedly mounted on the intermediate torsion shaft; when the compression spring is in its natural state, the toothed sleeve does not contact the liquid outlet channel; when the compression spring is compressed, the toothed sleeve can cover the liquid outlet channel.

[0015] The present invention also has the following features:

[0016] Furthermore, the intermediate torsion transmission shaft is provided with a plurality of axially extending guide rails evenly arranged along the circumference; the inner wall of the gear sleeve is provided with a plurality of axially extending slide grooves evenly arranged along the circumference; the number of slide grooves is the same as that of the guide rails and they match the corresponding guide rails.

[0017] Furthermore, the front end of the intermediate torsion transmission shaft is fixed and coaxially connected to a hexagonal torsion transmission shaft.

[0018] The upper drive shaft has a corresponding torque transmission hole at the corresponding position, and the intermediate torque transmission shaft is connected to the upper drive shaft through a hexagonal torque transmission shaft.

[0019] Furthermore, a seal is provided between the double male connector and the intermediate torsion shaft.

[0020] Furthermore, the intermediate torsion shaft has 2-4 liquid inlet channels on its front sidewall.

[0021] Compared with the prior art, the present invention has the following technical effects:

[0022] (I) The dual-power impact screw drill drive shaft assembly of the present invention integrates the impact function into the screw motor, which can realize the impact rotary drilling process. It is suitable for hard rock drilling in terms of mechanism, and the vibration generated by the impact is also conducive to the transmission of drilling pressure. It solves the problem of low efficiency of single-bend screw motor in hard rock drilling from two aspects.

[0023] (II) The dual-power impact screw drill drive shaft assembly of the present invention can be connected to a turbine motor. Compared with the screw motor, the turbine motor is characterized by high speed and low torque, which can realize high-speed rotation and high-frequency impact drilling process, further improve the force on the turbine motor drill bit, and solve the problem of drill bit jamming and stopping due to the small torque of the turbine motor. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the dual-power impact screw drill drive shaft assembly of the present invention;

[0025] Figure 2 This is a schematic diagram of the intermediate torsion shaft structure in this invention;

[0026] Figure 3 This is a schematic diagram of the connection structure between the gear sleeve and the roller seat in this invention.

[0027] The labels in the diagram represent the following: 1. Upper drive shaft; 2. Drill bit shaft; 3. Intermediate torque transmission shaft; 4. Inlet channel; 5. Outlet channel; 6. Compression spring; 7. Gear sleeve; 8. Roller seat; 9. Inner sleeve of the first TC bearing; 10. Thrust bearing; 11. Outer sleeve of the first TC bearing; 12. Bearing sleeve; 13. Double male connector; 14. Inner sleeve of the second TC bearing; 15. Outer sleeve of the second TC bearing; 16. Hexagonal torque transmission shaft; 17. Seal. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, all components in this invention are components known in the prior art.

[0029] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0030] like Figure 1-3 As shown, a dual-power impact screw drill bit drive shaft assembly, 1. A dual-power impact screw drill bit drive shaft assembly, including an upper drive shaft 1 and a drill bit shaft 2, characterized in that the upper drive shaft 1 is connected to the drill bit shaft 2 through an impact assembly;

[0031] The impact assembly includes an intermediate torsion shaft 3; the intermediate torsion shaft 3 has an axial hole in its middle, which is closed in the middle; multiple liquid inlet channels 4 are formed on the side wall of the front half of the intermediate torsion shaft 3, and liquid outlet channels 5 are formed on the side wall of the rear half of the intermediate torsion shaft 3, the number of which is the same as the number of liquid inlet channels 4; the liquid inlet channels 4 are connected to the front half of the shaft hole, and the liquid outlet channels 5 are connected to the rear half of the shaft hole; a compression spring 6, a toothed sleeve 7, and a roller seat 8 are sequentially sleeved on the intermediate torsion shaft 3 from the middle to the rear; the toothed sleeve 7 is slidably sleeved on the intermediate torsion shaft 3, and the roller seat 8 is rotatably sleeved on the intermediate torsion shaft 3;

[0032] It should be noted that, based on conventional selection in this field and actual working needs, 2-4 inlet channels 5 can generally be designed.

[0033] Multiple oblique transmission teeth are evenly distributed circumferentially on one end face of the gear sleeve 7. Rollers corresponding to the transmission teeth are provided on the end face of the roller seat 8 opposite to the gear sleeve 7. When the roller seat 8 rotates around the axis, the rollers can slide along the oblique surface of the transmission teeth.

[0034] The intermediate torsion shaft 3 of the impact assembly is fitted with a bearing sleeve 12; the bearing sleeve 12 is fixedly connected to the roller seat 8 and the bearing sleeve 12 can cover the compression spring 6, the toothed sleeve 7 and the roller seat 8.

[0035] The upper drive shaft 1 is sequentially fitted with the first TC bearing inner sleeve 9 and the thrust bearing 10;

[0036] The inner sleeve 9 of the first TC bearing and the outer sleeve 11 of the first TC bearing are both fitted together on the outside of the thrust bearing 10.

[0037] The first TC bearing outer sleeve 11 is connected to the front of the bearing sleeve 12 via a double male connector 13;

[0038] The drill bit shaft 2 is fitted with a second TC bearing inner sleeve 14, and a second TC bearing outer sleeve 15 is fitted on the second TC bearing inner sleeve 14. The rear end of the second TC bearing outer sleeve 15 is in contact with the front end of the roller seat 8.

[0039] The front end of the compression spring 6 is fixedly mounted on the intermediate torsion shaft 3; when the compression spring 6 is in its natural state, the toothed sleeve 7 does not contact the liquid outlet channel 5; when the compression spring 6 is compressed, the toothed sleeve 7 can cover the liquid outlet channel 5.

[0040] When in use, the upper drive shaft 1 is connected to the turbine motor. When the intermediate torsion shaft 3 rotates, it drives the roller seat 11 to rotate, causing the rollers in the roller seat 8 to roll and contact the inclined surface of the teeth of the gear sleeve 7. Since there are multiple inclined transmission teeth evenly distributed along the circumference at one end of the gear sleeve 7.

[0041] One end of the roller seat 8 is provided with rollers that correspond one-to-one with the transmission teeth. When the roller seat 8 rotates, the rollers can slide along the inclined surface of the transmission teeth.

[0042] It should be noted that since each transmission tooth is inclined, there is also a groove-like structure between two adjacent transmission teeth. The roller of the roller seat 8 moves along an inclined surface of a transmission tooth and falls into the groove area between the two transmission teeth after reaching the highest point.

[0043] Furthermore, the rollers of the roller seat 8 push the gear sleeve 7 axially backward along the inclined plane to compress the compression spring 6. After rotating 1 / n (n is the number of teeth of the gear sleeve 7, n is 3 in the schematic diagram) revolutions, the compression spring 6 drives the gear sleeve 7 to impact the roller seat 8. The roller seat 8 transmits the impact force to the drill bit through the drill bit shaft 2, generating a mechanical impact. This achieves impact-rotation-directional drilling without affecting the directional drilling function.

[0044] On the other hand, the intermediate hole section of the intermediate torsion shaft 3 is partially blocked, and several inlet channels 4 are machined at a certain angle (>120°) to the shaft hole on the upper part (considering the structural limitations of the intermediate torsion shaft 3 and actual needs, 2 to 4 channels can be set), without affecting the intermediate torsional strength. An outlet channel 5 perpendicular to the shaft hole is machined on the lower part. When the gear sleeve moves upward to its upper limit, the outlet channel 5 can be completely closed. When the gear sleeve 7 compresses the spring 6 upward to store energy, it will close the drilling fluid outlet channel 5. On one side of the gear sleeve 7 (… Figure 1 The middle left side forms an instantaneous high pressure, which acts on the toothed sleeve 7, pushing the toothed sleeve 7 to impact the roller seat 8, generating hydraulic impact. Combined with mechanical impact, this is beneficial to improving rock crushing efficiency.

[0045] The two methods work together to transmit the impact force to the drill bit through the drill bit shaft 2. The drill bit breaks the target rock layer under the dual action of rotation and impact. After the tooth sleeve 7 is pushed out, the fluid outlet channel 5 is opened, and the drilling fluid enters the bottom of the hole and carries the rock cuttings back out of the hole. Drilling stops when the borehole reaches the designed depth.

[0046] The dual-power impact screw drill bit drive shaft assembly of the present invention can be connected to a turbine motor. Compared with the screw motor, the turbine motor is characterized by high speed and low torque, which can realize high-speed rotation and high-frequency impact drilling process, further improve the force on the turbine motor drill bit, and solve the problem of drill bit jamming and stopping due to the low torque of the turbine motor.

[0047] As a preferred embodiment, multiple axially extending guide rails are evenly arranged along the circumference of the intermediate torsion shaft 3; multiple axially extending slide grooves are evenly arranged along the circumference of the inner wall of the gear sleeve 7; the number of slide grooves is the same as that of the guide rails and they match the corresponding guide rails, which facilitates the relative sliding of the two.

[0048] As a preferred embodiment, the front end of the intermediate torsion shaft 3 is fixed and coaxially connected to a hexagonal torsion shaft 16;

[0049] The upper drive shaft 1 has a corresponding torque transmission hole at the corresponding position, and the intermediate torque transmission shaft 3 is connected to the upper drive shaft 1 through a hexagonal torque transmission shaft 16. This achieves the function of circumferential torque transmission and axial relative sliding, so other polygonal connections, spline connections, etc. can be used instead.

[0050] As a preferred option, a seal 17 is provided between the double male connector 13 and the intermediate torque transmission shaft 3 to improve sealing performance.

Claims

1. A dual-power impact screw drill bit drive shaft assembly, comprising an upper drive shaft (1) and a drill bit shaft (2), characterized in that, The upper drive shaft (1) is connected to the drill bit shaft (2) via an impact assembly; The impact assembly includes an intermediate torsion shaft (3); the intermediate torsion shaft (3) has an axial hole in the middle, which is closed in the middle; multiple liquid inlet channels (4) are provided on the side wall of the front half of the intermediate torsion shaft (3); and liquid outlet channels (5) are provided on the side wall of the rear half of the intermediate torsion shaft (3) in the same number as the liquid inlet channels (4); the liquid inlet channels (4) are connected to the front half of the shaft hole, and the liquid outlet channels (5) are connected to the rear half of the shaft hole; a compression spring (6), a toothed sleeve (7), and a roller seat (8) are sequentially sleeved on the intermediate torsion shaft (3) from the middle to the rear; the toothed sleeve (7) is slidably sleeved on the intermediate torsion shaft (3), and the roller seat (8) is rolledly sleeved on the intermediate torsion shaft (3); The gear sleeve (7) has a plurality of oblique transmission teeth evenly distributed circumferentially on one end face. The roller seat (8) is provided with rollers corresponding to the transmission teeth on the end face opposite to the gear sleeve (7). When the roller seat (8) rotates around the axis, the rollers can slide along the oblique surface of the transmission teeth. The intermediate torsion shaft (3) of the impact assembly is fitted with a bearing sleeve (12); the bearing sleeve (12) is fixedly connected to the roller seat (8) and the bearing sleeve (12) can cover the compression spring (6), the toothed sleeve (7) and the roller seat (8); The upper drive shaft (1) is sequentially fitted with a first TC bearing inner sleeve (9) and a thrust bearing (10); The first TC bearing inner sleeve (9) and the thrust bearing (10) are both fitted with a first TC bearing outer sleeve (11); The first TC bearing outer sleeve (11) is connected to the front of the bearing sleeve (12) via a double male connector (13); The drill bit shaft (2) is fitted with a second TC bearing inner sleeve (14), and the second TC bearing outer sleeve (15) is fitted on the second TC bearing inner sleeve (14). The rear end of the second TC bearing outer sleeve (15) is in contact with the front end of the roller seat (8). The front end of the compression spring (6) is fixed on the intermediate torsion shaft (3); when the compression spring (6) is in its natural state, the toothed sleeve (7) does not contact the liquid outlet channel (5); when the compression spring (6) is compressed, the toothed sleeve (7) can cover the liquid outlet channel (5).

2. The dual-power impact screw drill bit drive shaft assembly as described in claim 1, characterized in that, The intermediate torsion shaft (3) is provided with a plurality of axially extending guide rails evenly arranged along the circumference; the inner wall of the gear sleeve (7) is provided with a plurality of axially extending slide grooves evenly arranged along the circumference; the number of slide grooves is the same as that of the guide rails and they match the corresponding guide rails.

3. The dual-power impact screw drill bit drive shaft assembly as described in claim 2, characterized in that, The intermediate torsion shaft (3) is fixed at its front end and coaxially connected to a hexagonal torsion shaft (16); The upper drive shaft (1) has a corresponding torque transmission hole at the corresponding position, and the intermediate torque transmission shaft (3) is connected to the upper drive shaft (1) through a hexagonal torque transmission shaft (16).

4. The dual-power impact screw drill bit drive shaft assembly as described in claim 3, characterized in that, A seal (17) is provided between the double male connector (13) and the intermediate torsion shaft (3).

5. The dual-power impact screw drill bit drive shaft assembly as described in claim 1, characterized in that, The intermediate torsion shaft (3) has 2-4 liquid inlet channels (4) on its front side wall.

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