Top drive device

Abstract

The invention discloses a top drive device, and relates to the technical field of drilling operation, the top drive device comprises a supporting unit, a driving unit, an impact unit and an impacted part, the driving unit is connected to the supporting unit, the driving unit is provided with a driving shaft, the driving shaft is used for being connected with a drilling tool, the driving shaft can rotate and drive the drilling tool to rotate, and the impacted part is connected with the driving unit. The impacted part is fixedly connected to the driving shaft, the impact unit is connected with the driving shaft and / or the supporting unit, the impact unit is provided with an impact part, and the impact part can collide with the impacted part to enable the impact part and the driving shaft to generate vibration. The top drive device can assist the drilling tool in breaking rocks and overcome jamming, and is higher in reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling operations, and particularly to a top drive device. Background Art

[0002] The top drive device (abbreviated as the top drive) is one of the important components in the drilling system. It can provide power for the drill string in the hole and is connected to the pressure loading system at the same time. Through the pressure loading system, the drilling pressure is transmitted to the drill bit, enabling the drill bit to smoothly drill into the rock formation. During actual drilling operations, the rock formation conditions are complex. When encountering a rock formation with a higher hardness, a smaller torque may cause the drill string to be unable to continue drilling and can only rotate in place idly. At this time, a high-power top drive device can provide sufficient torque for the drill string to overcome the jamming and continue drilling. However, for a low-power top drive device, the maximum torque it outputs is not sufficient to solve the above problems. At this time, other methods need to be adopted to overcome the drill string jamming. Some current drill strings have a vibration structure that can cause the drill bit to vibrate, and rock breaking can be achieved through the vibration of the drill bit. However, most of these vibration structures that can cause the drill bit to vibrate require a large amount of mechanical cooperation and circulating medium drive. When drilling, the drill string will come into contact with circulating drilling fluid or cuttings, etc. The vibration structure is easily affected and damaged by impurities such as cuttings during this process, and the reliability is insufficient. Therefore, there is an urgent need for a top drive device that can assist the drill string in rock breaking and overcoming jamming and has stronger reliability. Summary of the Invention

[0003] The purpose of the present invention is to provide a top drive device to solve the problems existing in the above-mentioned prior art, which can assist the drill string in rock breaking and overcoming jamming and has stronger reliability.

[0004] To achieve the above purpose, the present invention provides the following solution:

[0005] The present invention provides a top drive device, including: a support unit, a drive unit, an impact unit, and an impact-receiving member. The drive unit is connected to the support unit. The drive unit has a drive shaft, and the drive shaft is used to connect to the drill string. The drive shaft can rotate and drive the drill string to rotate. The impact-receiving member is fixedly connected to the drive shaft. The impact unit has a connection relationship with the drive shaft and / or the support unit. The impact unit has an impact portion, and the impact portion can collide with the impact-receiving member to cause the impact portion and the drive shaft to vibrate.

[0006] In some embodiments, the impact unit includes: an elastic member, a contact member, and the impact portion. The impacted member is sleeved and fixedly connected to the drive shaft. The impacted member has an impacted surface perpendicular to the axis of the drive shaft. The impacted surface is disposed opposite to the support unit with a spacing therebetween. The impact portion is a cylindrical tube that is sleeved on the drive shaft and located between the impacted surface and the support unit. The impact portion can slide axially along the drive shaft and is relatively fixed to the drive shaft in the circumferential direction of the drive shaft. The elastic member is sleeved on the drive shaft and located between the support unit and the impact portion. Two ends of the elastic member respectively abut against the support unit and the impact portion. A limiting portion is fixedly connected to the outside of the impact portion. The limiting portion has a limiting surface that faces away from the elastic member and is perpendicular to the axis of the drive shaft. The limiting surface extends around the impact portion along a first spiral. The central axis of the first spiral coincides with the central axis of the drive shaft. The limiting surface has a first position and a second position. The first position is closest to the elastic member among all other positions on the limiting surface. The second position is farthest from the elastic member among all other positions on the limiting surface. The first position and the second position are arranged in sequence along a direction parallel to the axis of the impact portion. The contact member is movably connected to the support unit. The contact member can approach and contact the limiting surface and can also move away from the limiting surface and separate from the limiting surface.

[0007] In some embodiments, the impact unit further includes: a telescopic control member. The telescopic control member is fixedly connected to the support unit. The telescopic control member has a free end. The contact member is fixedly connected to the free end. The free end can move in a direction perpendicular to the axis of the drive shaft and drive the contact member to contact or move away from the limiting surface.

[0008] In some embodiments, the drive unit includes: a main drive member and the drive shaft. The output end of the main drive member is in transmission connection with the drive shaft.

[0009] In some embodiments, the main drive member is a motor. The drive unit further includes: a driving gear and a driven gear. The driving gear is fixedly connected to the output shaft of the motor. The driven gear is sleeved outside the drive shaft. The driven gear is fixedly connected to the drive shaft in the axial direction of the drive shaft. The driving gear meshes with the driven gear.

[0010] In some embodiments, the motor is a stepping motor or a DC reduction motor.

[0011] In some embodiments, a spline connection is provided between the driving gear and the output shaft of the stepper motor or the DC reduction motor, and a spline connection is provided between the driven gear and the driving shaft.

[0012] In some embodiments, an installation cavity is provided inside the support unit. The driving gear and the driven gear are both arranged inside the installation cavity. First through holes and second through holes are respectively provided on two opposite sides of the support unit. The first through hole and the second through hole are coaxially arranged. The driving shaft passes through the first through hole and the second through hole and forms a rotational connection with the support unit.

[0013] In some embodiments, a first bearing, a second bearing, a first sealing cover and a second sealing cover are further included. The outer ring of the first bearing is fixedly connected to the inner side wall of the first through hole. The outer ring of the second bearing is fixedly connected to the side wall of the second through hole. The inner ring of the first bearing is fixedly connected to the outer side wall of the driving shaft. The inner ring of the second bearing is fixedly connected to the outer side wall of the driving shaft. The first sealing cover and the second sealing cover are respectively detachably connected to two sides of the support unit. Jack holes are provided on both the first sealing cover and the second sealing cover. The driving shaft passes through the two jack holes. The first sealing cover covers the first bearing, and the second sealing cover covers the second bearing.

[0014] In some embodiments, a first spacer sleeve and a second spacer sleeve are further included. The first spacer sleeve and the second spacer sleeve are both sleeved outside the driving shaft. The first spacer sleeve and the second spacer sleeve are respectively located on two sides of the driven gear. The end faces at both ends of the first spacer sleeve are respectively in contact with the first bearing and one side of the driven gear. The end faces at both ends of the second spacer sleeve are respectively in contact with the second bearing and the other side of the driven gear.

[0015] In some embodiments, a control system and a torque value detection device are further included. The torque detection device is used to detect the torque output value of the driving shaft. Both the torque value detection device and the impact unit are electrically connected to the control system. The control system can activate the impact unit according to the change of the torque value.

[0016] The present invention has achieved the following technical effects compared with the prior art:

[0017] The top drive device provided by the present invention has a drive shaft of a drive unit that can rotate and transmit torque to a drill string. The drill string can rotate and cause the drill bit of the drill string to drill underground. During drilling, if the drill bit encounters a blockage and cannot drill downward, the impact unit can be activated at this time, so that the impact part collides with the impacted part multiple times. The impact work generated by the impact part impacting the impacted part is transmitted to the drive shaft (and the support unit), and the drive shaft transmits the impact work to the drill bit, causing the rock mass blocking the drill bit to break, realizing the impact unlocking and efficient rock breaking of the small-torque top drive device. At the same time, since the top drive device is located outside the drilling well, the cuttings and drilling fluid in the drilling well also have less contact with the impact unit and the impacted part, reducing the risk of mechanical structures in the impact unit being contaminated and damaged by impurities such as cuttings, and greatly enhancing the reliability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 is a three-dimensional structure diagram of the top drive device in some embodiments of the present invention;

[0020] Figure 2 is Figure 1 the top view of the top drive device in;

[0021] Figure 3 is Figure 2 the A-A cross-sectional view of the top drive device in;

[0022] Figure 4 is a three-dimensional structure diagram of the impact part and the limiting part in some embodiments of the present invention;

[0023] In the figure: 1. Support unit; 2. Impacted part; 3. Drive shaft; 4. Elastic member; 5. Impact part; 6. Impact surface; 7. Limiting part; 8. Limiting surface; 9. First position; 10. Second position; 11. Telescopic control member; 12. Contact member; 13. Main drive member; 14. Driving gear; 15. Driven gear; 16. Installation cavity; 17. First through hole; 18. Second through hole; 19. First bearing; 20. Second bearing; 21. First sealing cover; 22. Second sealing cover; 23. First spacer sleeve; 24. Second spacer sleeve; 25. Chute. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] The object of the present invention is to provide a top drive device to solve the problems existing in the above-mentioned prior art, which can assist the drill string to break rock and overcome sticking, and has stronger reliability.

[0026] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] The present invention provides a top drive device, as Figures 1-4 shown, including: a support unit 1, a drive unit, an impact unit, and an impact-receiving member 2. The drive unit is connected to the support unit 1. The drive unit has a drive shaft 3, and the drive shaft 3 is used to connect with the drill string. The drive shaft 3 can rotate and drive the drill string to rotate. The impact-receiving member 2 is fixedly connected to the drive shaft 3. The impact unit has a connection relationship with the drive shaft 3 and / or the support unit 1. The impact unit has an impact portion 5, and the impact portion 5 can collide with the impact-receiving member 2 to cause vibrations of the impact portion 5 and the drive shaft 3.

[0028] In the top drive device provided by the present invention, the drive shaft 3 of the drive unit can rotate and transmit torque to the drill string, and the drill string can rotate to make the drill bit of the drill string drill underground. During drilling, if the drill bit encounters sticking and cannot drill downward, the impact unit can be started at this time to make the impact portion 5 collide with the impact-receiving member 2 multiple times. The impact work generated by the impact portion 5 impacting the impact-receiving member 2 is transmitted to the drive shaft 3 (and the support unit 1), and the drive shaft 3 transmits the impact work to the drill bit, so that the rock mass sticking the drill bit is broken, realizing impact sticking release and efficient rock breaking of the small-torque top drive device. At the same time, since the top drive device is located outside the drill well, the cuttings and drilling fluid in the drill well also have less contact with the impact unit and the impact-receiving member 2, reducing the risk of mechanical structures in the impact unit being contaminated and damaged by impurities such as cuttings, and greatly enhancing the reliability of the device. Among them, the drive shaft 3 is a hollow shaft, and processes such as core extraction by lifting the drill string and wireline coring can be realized through the cooperation of the hollow shaft and the drill string.

[0029] In an implementation manner of this first embodiment, the impact unit includes: an elastic member 4, a contact member 12, and an impact portion 5. The member to be impacted 2 is sleeved and fixedly connected to the drive shaft 3. The member to be impacted 2 has an impact surface 6 perpendicular to the axis of the drive shaft 3. The impact surface 6 is disposed opposite to the support unit 1 with a spacing therebetween. The impact portion 5 is a cylindrical tube. The impact portion 5 is sleeved on the drive shaft 3 and is located between the impact surface 6 and the support unit 1. The impact portion 5 can slide axially along the drive shaft 3. The impact portion 5 is relatively fixed to the drive shaft 3 in the circumferential direction of the drive shaft 3. The elastic member 4 is sleeved on the drive shaft 3 and is located between the support unit 1 and the impact portion 5. The two ends of the elastic member 4 respectively abut against the support unit 1 and the impact portion 5. A limiting portion 7 is fixedly connected to the outside of the impact portion 5. The limiting portion 7 has a limiting surface 8. The limiting surface 8 faces away from the elastic member 4 and is perpendicular to the axis of the drive shaft 3. The limiting surface 8 extends around the impact portion 5 along a first spiral. The central axis of the first spiral coincides with the central axis of the drive shaft 3. The limiting surface 8 has a first position 9 and a second position 10. The first position 9 is closest to the elastic member 4 among all other positions on the limiting surface 8. The second position 10 is farthest from the elastic member 4 among all other positions on the limiting surface 8. The first position 9 and the second position 10 are sequentially arranged in a direction parallel to the axis of the impact portion 5. The contact member 12 is movably connected to the support unit 1. The contact member 12 can approach the limiting surface 8 and contact the limiting surface 8. The contact member 12 can also move away from the limiting surface 8 and separate from the limiting surface 8. During normal drilling, the contact member 12 moves away from the limiting surface 8, and the drive shaft 3 normally drives the drill bit to rotate. If the drill bit gets stuck, the contact member 12 can be controlled to move and contact the limiting surface 8. At this time, the drive shaft 3 continues to rotate. The contact member 12 slides from the first position 9 along the limiting surface 8 to the second position 10, and causes the impact portion 5 to move towards the support unit 1 and compress the elastic member 4. Then the drive shaft 3 continues to rotate, the contact member 12 disengages from the second position 10, the elastic member 4 rebounds, the contact member 12 slides down to the first position 9, and the resilience of the elastic member 4 causes the impact portion 5 to move towards the member to be impacted 2 and strike the member to be impacted 2 to generate impact work. As the drive shaft 3 continuously rotates, the impact portion 5 strikes the member to be impacted 2 multiple times and generates impact work multiple times, realizing rock breaking and stuck release. The above method utilizes the driving force of the driving unit, converts the torque of the drive shaft 3 into the collision impact between the impact portion 5 and the member to be impacted 2, and can generate impact work without setting other drive sources other than the driving unit, simplifies the structure, and reduces energy consumption.

[0030] Specifically, a plurality of chutes 25 extending axially along the impact portion 5 are provided on the inner side surface of the impact portion 5. A plurality of limiting tracks extending axially along the drive shaft 3 are provided outside the drive shaft 3. The limiting tracks and the chutes 25 form a sliding connection; the impact portion 5 and the limiting portion 7 are integrally formed.

[0031] It should be noted that, in addition to the methods in the above embodiments, regardless of the simplicity or complexity of the structure and the energy consumption problem, a motor and a linear motion module can also be fixedly arranged on the support unit 1, and at the same time, the impact part 5 is fixedly connected to the free end of the linear motion module. The motor controls the movement of the impact part 5 to reciprocate axially along the drive shaft 3 to directly collide with the impacted part.

[0032] In an embodiment of this embodiment, the impact unit further includes: a telescopic control member 11, the telescopic control member 11 is fixedly connected to the support unit 1, the telescopic control member 11 has a free end, the contact member 12 is fixedly connected to the free end, and the free end can move in a direction perpendicular to the axis of the drive shaft 3 and drive the contact member 12 to contact or move away from the limiting surface 8. The telescopic control member 11 can facilitate the staff to control the position of the contact member 12. Among them, the telescopic control member 11 is preferably electrically driven.

[0033] In an embodiment of this embodiment, the driving unit includes: a main driving member 13 and a drive shaft 3, the output end of the main driving member 13 is in transmission connection with the drive shaft 3, and the output end of the main driving member 13 can rotate the drive shaft 3 and provide torque for the drill bit.

[0034] In an embodiment of this embodiment, the main driving member is a motor, and the driving unit further includes: a driving gear 14 and a driven gear 15, the driving gear 14 is fixedly connected to the output shaft of the motor, the driven gear 15 is sleeved outside the drive shaft 3, the driven gear 15 is fixedly connected to the drive shaft 3 in the axial direction of the drive shaft 3, and the driving gear 14 meshes with the driven gear 15. When the output shaft of the motor rotates, it can drive the driving gear 14 to rotate. The driving gear 14 meshes with the driven gear 15 and drives the driven gear 15 to rotate, thereby causing the drive shaft 3 to rotate and transmitting the torque of the motor to the drive shaft 3.

[0035] In an embodiment of this embodiment, the motor is a stepping motor or a DC reduction motor. The stepping motor precisely controls the rotation speed of the drive shaft 3 through the number of pulses; the DC reduction motor can achieve continuous variable speed and has a fast response speed.

[0036] In an embodiment of this embodiment, the driving gear 14 and the output shaft of the stepping motor or the DC reduction motor are connected by a spline, and the driven gear 15 and the drive shaft 3 are connected by a spline. The spline transmits torque through multiple key teeth. Compared with the connection method of a single key (such as a flat key) fit, the limiting area is larger and it can withstand higher loads.

[0037] In an implementation manner of this first embodiment, there is an installation cavity 16 inside the support unit 1. The driving gear 14 and the driven gear 15 are both arranged inside the installation cavity 16. First through holes 17 and second through holes 18 are respectively arranged on two opposite sides of the support unit 1. The first through holes 17 and the second through holes 18 are coaxially arranged. The driving shaft 3 passes through the first through holes 17 and the second through holes 18 and forms a rotational connection with the support unit 1. The installation cavity 16 can protect the driving gear 14 and the driven gear 15, preventing liquids, dust, etc. at the drilling site from contaminating the driving gear 14 and the driven gear 15, and improving the service life.

[0038] In an implementation manner of this first embodiment, the top drive device provided by the present invention further includes a first bearing 19, a second bearing 20, a first sealing cover 21 and a second sealing cover 22. The outer ring of the first bearing 19 is fixedly connected to the inner side wall of the first through hole 17. The outer ring of the second bearing 20 is fixedly connected to the side wall of the second through hole 18. The inner ring of the first bearing 19 is fixedly connected to the outer side wall of the driving shaft 3. The inner ring of the second bearing 20 is fixedly connected to the outer side wall of the driving shaft 3. The first sealing cover 21 and the second sealing cover 22 are respectively detachably connected to two sides of the support unit 1. Jack holes are provided on both the first sealing cover 21 and the second sealing cover 22. The driving shaft 3 passes through the two jack holes. The first sealing cover 21 covers the first bearing 19, and the second sealing cover 22 covers the second bearing 20. When the driving shaft 3 rotates, the inner ring of the first bearing 19 rotates relative to the outer ring, and the outer ring of the second bearing 20 rotates relative to the outer ring. The first bearing 19 and the second bearing 20 can play a good limiting role on the driving shaft 3; the first sealing cover 21 and the second sealing cover 22 can protect the balls of the bearings, prevent the balls of the bearings from being contaminated, and can be disassembled at the same time, which is convenient for the replacement and maintenance of the bearings. Among them, the first sealing cover 21 and the second sealing cover 22 are preferably connected to the support unit 1 by bolts.

[0039] In an implementation manner of this first embodiment, the top drive device provided by the present invention further includes a first spacer 23 and a second spacer 24. Both the first spacer 23 and the second spacer 24 are sleeved outside the driving shaft 3. The first spacer 23 and the second spacer 24 are respectively located on two sides of the driven gear 15. The end faces at both ends of the first spacer 23 are respectively in contact with the first bearing 19 and one side of the driven gear 15. The end faces at both ends of the second spacer 24 are respectively in contact with the second bearing 20 and the other side of the driven gear 15. The first spacer 23 and the second spacer 24 can play a limiting role on the driven gear 15, preventing the driven gear 15 from displacing axially on the driving shaft 3.

[0040] In some embodiments, the top drive device further includes a control system and a torque value detection device. The torque detection device is used to detect the torque output value of the drive shaft 3. Both the torque value detection device and the impact unit are electrically connected to the control system, and the control system can turn on the impact unit according to the change of the torque value. When encountering a stuck situation, the torque value of the drive shaft 3 will change, and the control system controls the impact unit to start working according to the change of the torque value, realizing the automatic activation of the impact function and the function conversion according to the drilling requirements. The torque value detection device can be an ultrasonic torque sensor, a strain gauge torque sensor, etc.

[0041] In the present invention, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A top drive device, characterized in that: include: A support unit, a driving unit, an impact unit and an impacted part, wherein the driving unit is connected to the support unit, the driving unit has a driving shaft, the driving shaft is used to connect with a drilling tool, the driving shaft can rotate and drive the drilling tool to rotate, the impacted part is fixedly connected to the driving shaft, the impact unit is connected to the driving shaft and / or the support unit, and the impact unit has an impact part, the impact part can collide with the impacted part to cause the impact part and the driving shaft to vibrate.

2. The top drive device according to claim 1, characterized in that: The impact unit comprises: an elastic member, a contact member and the impact part, the impact member is sleeved on and fixedly connected to the driving shaft, the impact member has an impact surface perpendicular to the axis of the driving shaft, the impact surface is arranged opposite to the supporting unit and has a spacing, the impact part is a cylindrical tube, the impact part is sleeved on the driving shaft and is located between the impact surface and the supporting unit, the impact part can slide along the axial direction of the driving shaft, the impact part is relatively fixed to the driving shaft in the circumferential direction of the driving shaft, the elastic member is sleeved on the driving shaft and is located between the supporting unit and the impact part, the two ends of the elastic member are respectively against the supporting unit and the impact part, the impact part is fixedly connected to the limiting part outside, the limiting part The positioning portion has a limiting surface, which faces away from the elastic member and is perpendicular to the axis of the driving shaft. The limiting surface extends around the impact portion along a first spiral, and the central axis of the first spiral coincides with the central axis of the driving shaft. The limiting surface has a first position and a second position. The first position is closer to the elastic member than all other positions on the limiting surface, and the second position is farther away from the elastic member than all other positions on the limiting surface. The first position and the second position are arranged in sequence along a direction parallel to the axis of the impact portion. The contact member is movably connected to the supporting unit. The contact member can approach the limiting surface and contact the limiting surface, and the contact member can also move away from the limiting surface and separate from the limiting surface.

3. The top drive device according to claim 2, characterized in that: The impact unit also includes: a telescopic control member, which is fixedly connected to the support unit, and has a free end. The contact member is fixedly connected to the free end, and the free end can move in a direction perpendicular to the axis of the drive shaft and drive the contact member to contact or move away from the limit surface.

4. The top drive device according to claim 1, characterized in that: The driving unit comprises: a main driving member and the driving shaft, and an output end of the main driving member is drivingly connected to the driving shaft.

5. The top drive device according to claim 4, characterized in that: The main driving component is a motor, and the driving unit further includes: a driving gear and a driven gear, wherein the driving gear is fixedly connected to the output shaft of the motor, the driven gear is sleeved outside the driving shaft, the driven gear is fixedly connected to the driving shaft in the axial direction of the driving shaft, and the driving gear is meshed with the driven gear.

6. The top drive device according to claim 5, characterized in that: The motor is a stepping motor or a DC reduction motor, the driving gear is spline-connected to the output shaft of the stepping motor or the DC reduction motor, and the driven gear is spline-connected to the driving shaft.

7. The top drive device according to claim 5, characterized in that: The support unit has an installation cavity in it, the driving gear and the driven gear are both arranged in the installation cavity, the support unit is provided with a first through hole and a second through hole on opposite sides, the first through hole and the second through hole are coaxially arranged, the driving shaft passes through the first through hole and the second through hole and forms a rotational connection with the support unit.

8. The top drive device according to claim 7, characterized in that: It also includes a first bearing, a second bearing, a first sealing cover and a second sealing cover, the outer ring of the first bearing is fixedly connected to the inner wall of the first through hole, the outer ring of the second bearing is fixedly connected to the side wall of the second through hole, the inner ring of the first bearing is fixedly connected to the outer wall of the drive shaft, the inner ring of the second bearing is fixedly connected to the outer wall of the drive shaft, the first sealing cover and the second sealing cover are respectively detachably connected to both sides of the support unit, the first sealing cover and the second sealing cover are both provided with insertion holes, the drive shaft passes through the two insertion holes, the first sealing cover covers the first bearing, and the second sealing cover covers the second bearing.

9. The top drive device according to claim 8, characterized in that: It also includes a first spacer and a second spacer, wherein the first spacer and the second spacer are both sleeved outside the driving shaft, and the first spacer and the second spacer are respectively located on both sides of the driven gear, and the end faces at both ends of the first spacer are respectively in contact with the first bearing and one side of the driven gear, and the end faces at both ends of the second spacer are respectively in contact with the second bearing and the other side of the driven gear.

10. The top drive device according to claim 1, characterized in that: It also includes a control system and a torque value detection device, wherein the torque detection device is used to detect the torque output value of the drive shaft, the torque value detection device and the impact unit are both connected to the control system by electrical signals, and the control system can activate the impact unit according to the change of the torque value.

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