CN219946011U

CN219946011U - Bolt screwing tool

Info

Publication number: CN219946011U
Application number: CN202321726563.XU
Authority: CN
Inventors: 刘欢; 周寅忱; 王海龙; 贺彦伟; 张茂林; 张富强; 王小龙; 傅永安
Original assignee: Guohua Hami New Energy Co ltd; Guohua Energy Investment Co ltd
Current assignee: Guohua Hami New Energy Co ltd; Guohua Energy Investment Co ltd
Priority date: 2023-07-03
Filing date: 2023-07-03
Publication date: 2023-11-03
Anticipated expiration: 2033-07-03

Abstract

The disclosure relates to a bolt screwing tool, comprising an electric wrench, a switch assembly and an abutting assembly. The electric wrench comprises an electric wrench body and a bolt sleeve, wherein the electric wrench body comprises a motor; the switch assembly comprises a normally closed contact switch and a locking piece, the normally closed contact switch is arranged in a power supply circuit of the motor and is connected with the motor in series, the normally closed contact switch is movably arranged on the electric wrench body along the axial direction of the bolt sleeve, and the locking piece can be used for locking the normally closed contact switch in an unlocking manner; the abutting component comprises an abutting rod extending along the axial direction of the bolt sleeve, the abutting rod and the normally closed contact switch are located on the same straight line, the abutting rod is movably installed on the electric wrench body along the axial direction of the bolt sleeve, the front end of the abutting rod is used for abutting with an installation structure to be screwed into the bolt, and the rear end of the abutting rod can abut against the normally closed contact switch. The screwing tool for the bolt can timely stop screwing work of the electric wrench, and reduce the occurrence of excessive screwing of the electric wrench on the bolt.

Description

Bolt screwing tool

Technical Field

The present disclosure relates to the field of bolt assembly tools, and in particular, to a bolt screwing tool.

Background

Wind generating sets and other large-scale mechanical facilities are assembled by a plurality of mechanical parts, the parts are often connected in a detachable mode, and a stud is often used for connection, for example, in a large-scale megawatt wind generating set, large fasteners for part connection are generally connected in a stud and nut mode, and a bolt stretcher is used for stretching and tightening bolts.

The patent with the publication number of CN205271871U discloses a stud assembling tool for a wind generating set, which comprises an impact wrench for assembling a stud of the wind generating set, wherein an adjusting snap ring is fastened at the front end of the impact wrench, a mounting hole is formed in the adjusting snap ring, a limit rod is slidably arranged in the mounting hole, and a fastening assembly for fastening the limit rod is arranged on the adjusting snap ring.

When the impact wrench is actually used, the position of the limiting rod is adjusted to move to the preset length of the stud according to the preset length of the stud, the limiting rod is fastened through the fastening assembly, and the stud is screwed. However, after the bolt is screwed in place, a user may not be able to stop the impact wrench in time, which results in that the impact wrench continues to screw the bolt, which results in excessive screw-out of the bolt, and affects the screw-out accuracy of the bolt.

Disclosure of Invention

The utility model aims at providing a bolt screwing tool, this bolt screwing tool can in time stop electric spanner's the work of screwing, avoids the bolt to revolve to twist the condition emergence of excessive.

In order to achieve the above object, the present disclosure provides a bolt screwing tool including:

the electric wrench comprises an electric wrench body and a bolt sleeve, wherein the electric wrench body comprises a motor, and the motor is connected with the bolt sleeve and is used for driving the bolt sleeve to rotate;

the switch assembly comprises a normally-closed contact switch and a locking piece, the normally-closed contact switch is arranged in a power supply circuit of the motor and is connected in series with the motor, the normally-closed contact switch is movably arranged on the electric wrench body along the axial direction of the bolt sleeve, and the locking piece can be used for locking the normally-closed contact switch in a releasable manner so as to allow or limit the movement of the normally-closed contact switch;

the abutting component comprises an abutting rod extending along the axial direction of the bolt sleeve, the abutting rod is positioned in front of the normally-closed contact switch and is positioned on the same straight line with the normally-closed contact switch, the abutting rod is movably mounted on the electric wrench body along the axial direction of the bolt sleeve, the front end of the abutting rod is used for abutting against a mounting structure of a bolt to be screwed in, and the rear end of the abutting rod can abut against the normally-closed contact switch;

the normally-closed contact switch can disconnect a power supply circuit of the motor when the rear end of the abutting rod abuts against the normally-closed contact switch, so that the motor is closed.

Optionally, the front end of the abutment rod protrudes from the bolt sleeve along the axial direction of the bolt sleeve.

Optionally, the switch assembly further includes a slider and a guide rail extending along an axial direction of the bolt sleeve, the guide rail is mounted on the electric wrench body, the slider is slidably connected to the guide rail, the normally closed contact switch is mounted on the slider, and the locking member can be used for locking the slider at any position on the guide rail in an unlocking manner.

Optionally, a plurality of scale marks are arranged on the guide rail at intervals along the extending direction of the guide rail.

Optionally, the cross-section of guide rail is the T font, be formed with on the slider with guide rail sliding fit's T-shaped groove, the locking piece includes the screw thread support pole, screw thread support pole threaded connection in the slider, the one end of screw thread support pole is located the outside of slider, the other end of screw thread support pole can stretch into in the T-shaped inslot and with the surface of guide rail supports tightly.

Optionally, an end surface of the threaded abutment rod, which is close to the guide rail, is formed as a friction surface.

Optionally, the abutting component further comprises a guide seat, the guide seat is installed on the electric wrench body, a guide hole is formed in the guide seat, the aperture of the guide hole is matched with the outer diameter of the abutting rod, and the abutting rod movably penetrates through the guide hole.

Optionally, the abutting rod comprises a rod body and a contact block, the rod body is arranged in the guide hole in a penetrating mode, and the contact block is located at one end, close to the normally-closed contact switch, of the rod body and is used for being in contact with the normally-closed contact switch;

the abutting assembly further comprises an elastic piece, one end of the elastic piece is connected with the contact block, the other end of the elastic piece is connected with the guide seat, and the elastic piece is used for applying elastic force for enabling the contact block to move towards a direction far away from the normally-closed contact switch.

Optionally, the spring is sleeved on a portion of the rod body located between the guide seat and the contact block.

Optionally, a buffer pad is arranged at one end of the abutting rod, which is close to the normally-closed contact switch.

Through the technical scheme, in the process of screwing the bolt, the position of the normally-closed contact switch on the electric wrench body is adjusted according to the length of the bolt to be screwed, and the position of the normally-closed contact switch corresponding to the electric wrench body is locked through the locking piece. The bolt sleeve is clamped with the screwing head of the bolt to be screwed in, the electric wrench body is started, and the motor drives the bolt sleeve to rotate, so that the bolt moves towards the inside of the bolt hole of the mounting structure. And the front end of the abutting rod abuts against the outer surface of the mounting structure. Along with the continuous deep penetration of bolt towards the interior of mounting structure's bolt hole, the butt pole is along the axial displacement of bolt sleeve to make the rear end of butt pole towards normally closed contact switch removal, when the rear end of butt pole and the normally closed contact switch who is in the predetermined position contact, normally closed contact switch disconnection motor's power supply circuit, make the motor close, the bolt sleeve stops to drive the bolt and rotates. At the moment, the length of the bolt to be screwed is reduced, the screw screwing precision is met, and the condition of excessive screw screwing of the bolt is reduced.

Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:

FIG. 1 is an overall block diagram of a bolt-driving tool provided in an exemplary embodiment of the present disclosure;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is a schematic view of a bolt screwing tool provided in an exemplary embodiment of the present disclosure in an operating state for showing a state in which the bolt screwing tool is screwed into a bolt and aligned with a bolt hole;

FIG. 4 is a schematic view of a bolt screwing tool provided in an exemplary embodiment of the present disclosure in another operating state for showing a state in which the bolt screwing tool screws a bolt into a bolt hole;

fig. 5 is an assembly relationship diagram of a slider and a rail of a bolt screwing tool provided in an exemplary embodiment of the present disclosure.

Description of the reference numerals

1. An electric wrench; 101. an electric wrench body; 102. a bolt sleeve; 2. a switch assembly; 201. a normally closed contact switch; 202. a locking member; 2021. a threaded abutment; 203. a slide block; 204. a guide rail; 3. an abutment assembly; 301. a butt joint rod; 3011. a rod body; 3012. a contact block; 302. a guide seat; 303. an elastic member; 4. scale marks; 5. a guide hole; 6. a bolt; 7. a mounting structure; 8. bolt holes.

Detailed Description

Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.

In the present disclosure, unless otherwise indicated, terms of orientation such as "front and rear" are used to generally refer to the front and rear of the corresponding component in the horizontal direction in the use state, and "inner and outer" refer to the inner and outer of the contour of each component itself.

As shown in fig. 1-5, the present disclosure provides a bolt screwing tool including an electric wrench 1, the electric wrench 1 further including an electric wrench body 101 and a bolt sleeve 102. The electric wrench body 101 further comprises a handle and a motor, wherein a button switch is arranged on the handle, the button switch is arranged in a power supply circuit of the motor and is connected with the motor in series, and the motor is connected with the bolt sleeve 102 and is used for driving the bolt sleeve 102 to rotate.

In the process of screwing the bolt 6, when a button switch of the electric wrench 1 is turned on, a power supply circuit is conducted, so that the motor rotates and drives the bolt sleeve 102 to rotate; and when the push button switch of the electric wrench 1 is turned off, the power supply circuit is disconnected, so that the motor is turned off, and the bolt sleeve 102 stops rotating.

In the above process, after the bolt 6 is screwed in place, the user may not be able to close the button switch in time to disconnect the power supply circuit, so that the motor drives the bolt sleeve 102 to continue screwing the bolt 6, and further affects the screwing accuracy of the bolt 6.

Therefore, in order to timely stop the screwing operation of the impact wrench and reduce the occurrence of excessive screwing of the impact wrench on the bolt 6, the bolt screwing tool further comprises the switch assembly 2 and the abutting assembly 3. And the switch assembly 2 comprises a normally closed contact switch 201, the normally closed contact switch 201 being arranged in the supply circuit of the motor and in series with the motor.

Here, in the present disclosure, the normally closed contact switch 201, the push button switch, and the motor are all connected in series in the power supply circuit of the motor. And the normally closed contact switch 201 refers to a switch in a closed state without external force, that is, when the normally closed contact switch 201 is pressed, a power supply circuit of the motor is disconnected at the normally closed contact switch 201; when the normally closed contact switch 201 is not pressed, the power supply circuit of the motor is closed at the normally closed contact switch 201.

In one example, when the push button switch is pressed (i.e., the push button switch is closed) and the normally closed contact switch 201 is not pressed (i.e., the normally closed contact switch 201 is closed), the power supply circuit is conducted, so that the motor rotates and drives the bolt sleeve 102 to rotate; while the push button switch is continuously pressed (i.e., the push button switch is closed), and the normally closed contact switch 201 is pressed (i.e., the normally closed contact switch 201 is opened), the above-described power supply circuit is opened, so that the motor is turned off, and the rotation of the bolt sleeve 102 is stopped.

The switch assembly 2 further includes a locking member 202, the normally-closed contact switch 201 being movably mounted to the electric wrench body 101 in an axial direction of the bolt sleeve 102, the locking member 202 being capable of releasably locking the normally-closed contact switch 201 to allow or restrict movement of the normally-closed contact switch 201. The abutting assembly 3 comprises an abutting rod 301 extending along the axial direction of the bolt sleeve 102, the abutting rod 301 is positioned in front of the normally closed contact switch 201, the abutting rod 301 and the normally closed contact switch 201 are positioned on the same straight line, the abutting rod 301 is movably mounted on the electric wrench body 101 along the axial direction of the bolt sleeve 102, the front end of the abutting rod 301 is used for abutting against the mounting structure 7 to be screwed into the bolt 6, and the rear end of the abutting rod 301 can abut against the normally closed contact switch 201; wherein the normally closed contact switch 201 can disconnect the power supply circuit of the motor when the rear end of the abutting rod 301 abuts against the normally closed contact switch 201, so that the motor is turned off.

Through the above technical scheme, in the process of screwing the bolt 6, according to the length of the bolt 6 to be screwed, the position of the normally-closed contact switch 201 on the electric wrench body 101 is adjusted, and the corresponding position of the normally-closed contact switch 201 on the electric wrench body 101 is locked through the locking piece 202, and the bolt sleeve 102 is clamped with the screwing head of the bolt 6 to be screwed.

Then, the button switch is pressed, the electric wrench body 101 is started, and the motor drives the bolt sleeve 102 to rotate, so that the bolt 6 moves towards the inside of the bolt 6 hole of the mounting structure 7. The distal end of the abutting rod 301 abuts against the outer surface of the mounting structure 7, and as the bolt 6 goes deeper into the bolt 6 hole of the mounting structure 7, the abutting rod 301 moves in the axial direction of the bolt sleeve 102, and the rear end of the abutting rod 301 moves toward the normally closed contact switch 201.

When the rear end of the abutting rod 301 contacts with the normally closed contact switch 201 at a predetermined position, the normally closed contact switch 201 can disconnect the power supply circuit of the motor, so that the motor is turned off, and the bolt sleeve 102 stops driving the bolt 6 to rotate. At this time, the length of the bolt 6 to be screwed is increased, the screwing precision of the bolt 6 is satisfied, and the occurrence of excessive screwing of the bolt 6 is reduced.

Alternatively, the front end of the abutting rod 301 protrudes from the bolt sleeve 102 along the axial direction of the bolt sleeve 102, the bolt sleeve 102 is sleeved with the screwing head of the bolt 6 to be screwed in, and when the bolt 6 is aligned with the hole of the bolt 6 to be installed, the front end of the abutting rod 301 can abut against the installation structure 7 of the bolt 6 to be screwed in. Also, as the bolt 6 is continuously inserted into the bolt 6 hole in the mounting structure 7, and the bolt 6 is screwed to a length to be screwed, the rear end of the abutting rod 301 may abut against the normally closed contact switch 201.

Optionally, the switch assembly 2 further comprises a slider 203 and a rail 204 extending in the axial direction of the bolt sleeve 102, the slider 203 is slidably connected to the rail 204, the normally closed contact switch 201 is mounted on the slider 203, and the locking member 202 is capable of releasably locking the slider 203 in any position on the rail 204.

Through the arrangement, the normally-closed contact switch 201 can be driven to slide back and forth on the guide rail 204 along the axial direction of the bolt sleeve 102 through the sliding block 203, so that the normally-closed contact switch 201 can slide to a position corresponding to the guide rail 204 according to the length of the bolt 6 to be screwed, and then the sliding block 203 is fixed through the locking piece 202, so that the position of the normally-closed contact switch 201 on the guide rail 204 is fixed. The guide rail 204 may guide the movement of the normally closed contact switch 201.

As an embodiment, the guide rail 204 is provided with a plurality of graduation marks 4 which are arranged at intervals along the extending direction of the guide rail 204, so that a user can conveniently slide the normally-closed contact switch 201 to a corresponding position on the guide rail 204 through the sliding block 203 by observing the graduation marks 4 according to the length of the bolt 6 which needs to be screwed.

Here, the installation position of the guide rail 204 on the electric wrench body 101 may be located above the bolt sleeve 102, so that the user can observe the graduation mark 4 when adjusting the position of the normally closed contact switch 201 on the guide rail 204; the screwing condition of the bolt sleeve 102 to the bolt 6 and the abutting condition of the abutting rod 301 and the normally closed contact switch 201 can be observed by a user conveniently when screwing the bolt 6.

In addition, in order that the slider 203 can drive the normally-closed contact switch 201 to slide back and forth on the guide rail 204 along the axial direction of the bolt sleeve 102, and in the sliding process of the slider 203 on the guide rail 204, the slider 203 is not easy to separate from the guide rail 204, optionally, the section of the guide rail 204 is T-shaped, and a T-shaped groove in sliding fit with the guide rail 204 is formed on the slider 203.

As an embodiment, in order to prevent the slider 203 from sliding out from both ends of the guide rail 204, a shutter for blocking the slider 203 from sliding out from the end of the guide rail 204 may be installed at both ends of the guide rail 204.

Optionally, the locking member 202 includes a threaded abutment 2021, the threaded abutment 2021 is screwed to the slider 203, one end of the threaded abutment 2021 is located outside the slider 203, and the other end of the threaded abutment 2021 can extend into the T-shaped slot and abut against the outer surface of the guide rail 204.

With the above arrangement, when the position of the normally closed contact switch 201 needs to be fixed, the screw thread support rod 2021 is rotated clockwise, so that the end surface of the screw thread support rod 2021 is supported against the outer surface of the guide rail 204, and the position of the slider 203 on the guide rail 204 is locked by friction force, thereby fixing the position of the normally closed contact switch 201; when the position of the normally closed contact switch 201 needs to be adjusted, the threaded abutment 2021 is rotated counterclockwise, so that the end surface of the threaded abutment 2021 is out of abutment with the outer surface of the guide rail 204, and the slider 203 is unlocked, so that the position of the normally closed contact switch 201 can be adjusted.

Here, in order to increase the friction force between the end face of the screw rod 2021 and the outer surface of the guide rail 204, the end face of the screw rod 2021 near the guide rail 204 is formed as a friction face, and the number of the screw rods 6 may be plural. As an exemplary embodiment, the threaded support rod 2021 may be provided on both sides of the guide rail 204 by installing a sponge spacer on an end surface of the threaded support rod 2021 near the guide rail 204.

Optionally, the abutment assembly 3 further includes a guide holder 302, the guide holder 302 is mounted on the electric wrench body 101, a guide hole 5 is formed on the guide holder 302, the aperture of the guide hole 5 is adapted to the outer diameter of the abutment rod 301, and the abutment rod 301 movably penetrates through the guide hole 5.

Through the arrangement, the guide seat 302 can provide the guiding and supporting functions for the abutting rod 301, and the aperture of the guide hole 5 is matched with the outer diameter of the abutting rod 301, so that the abutting rod 301 is not easy to shake in the sliding process, the deviation generated in the abutting process of the abutting rod 301 and the normally-closed contact switch 201 is reduced, and the screwing precision of the bolt 6 is guaranteed.

Alternatively, the abutting rod 301 includes a rod 3011 and a contact block 3012, the rod 3011 is disposed through the guide hole 5, and the contact block 3012 is located at one end of the rod 3011 near the normally closed contact switch 201 and is used for contacting the normally closed contact switch 201; the abutment assembly 3 further comprises an elastic member 303, one end of the elastic member 303 is connected to the contact block 3012, the other end of the elastic member 303 is connected to the guide seat 302, and the elastic member 303 is configured to apply an elastic force to the contact block 3012 to move in a direction away from the normally closed contact switch 201.

With the above arrangement, the contact block 3012 can increase the contact area with the normally-closed contact switch 201, and the normally-closed contact switch 201 is turned on after the contact block 3012 contacts with the normally-closed contact switch 201. The elastic member 303 can apply an elastic force to the contact block 3012, so that the rod 3011 moves towards a direction away from the normally-closed contact switch 201, so that the contact block 3012 can keep a distance from the normally-closed contact switch 201, and the screwing of the electric wrench 1 to the bolt 6 is prevented from being interrupted after the contact block 3012 contacts with the normally-closed contact switch 201 when the electric wrench is normally screwed to the bolt 6.

As one embodiment, the elastic member 303 is a spring, the spring is sleeved on a portion of the rod 3011 located between the guide base 302 and the contact block 3012, one end of the spring is connected to the contact block 3012, and the other end of the spring is connected to the guide base 302.

Optionally, a buffer pad is provided at an end of the abutting rod 301 near the normally-closed contact switch 201 to reduce impact of the abutting rod 301 on the normally-closed contact switch 201 during abutting of the normally-closed contact switch 201.

As an embodiment, the cushion pad may be a rubber head that may directly replace the contact block 3012 described above and is used to make abutment with the normally closed contact switch 201.

As another embodiment, the cushion pad may be a rubber pad, which is mounted on the end surface of the contact block 3012 near the normally closed contact switch 201.

In practical use, as shown in fig. 1, first, the screwing head to be screwed into the bolt 6 is aligned with the bolt sleeve 102, and then the screwing head of the bolt 6 is engaged into the bolt sleeve 102. As shown in fig. 3, the bolt 6 to be screwed in is again aligned with the bolt 6 hole of the mounting structure 7 and is located outside the bolt 6 hole waiting to be screwed into the bolt 6 hole by the electric wrench 1. In the process of aligning the bolt 6 hole to be screwed into the bolt 6 and moving towards the bolt 6 hole, after the front end of the rod 3011 can be abutted against the outer surface of the mounting structure 7, the rod 3011 moves towards the normally closed contact switch 201 along with the process of driving the bolt 6 to move towards the bolt 6 hole by the electric wrench 1.

Then, when the bolt 6 moves to the outside of the hole of the bolt 6 to be screwed, according to the length D1 of the bolt 6 to be screwed, the position of the normally closed contact switch 201 on the guide rail 204 is adjusted through the sliding of the sliding block 203, the distance D2 between the contact block 3012 and the normally closed contact switch 201 is the length D1 of the bolt 6 to be screwed through observing the scale mark 4, and after the distance D2 is adjusted to be in place, the sliding block 203 is fixed on the guide rail 204 through the threaded supporting rod 2021 so as to fix the position of the normally closed contact switch 201.

Finally, the push button switch is pressed, the power supply circuit is conducted, the motor rotates and drives the bolt sleeve 102 to rotate, the rod 3011 moves along the axial direction of the bolt sleeve 102 along with the fact that the bolt 6 continuously penetrates into the bolt 6 hole of the mounting structure 7, and the contact block 3012 moves towards the normally-closed contact switch 201.

As shown in fig. 4, when the contact block 3012 abuts against the normally closed contact switch 201 at a predetermined position, the normally closed contact switch 201 can disconnect the power supply circuit of the motor, so that the motor is turned off, and the bolt sleeve 102 stops driving the bolt 6 to rotate. Because the distance D2 between the contact block 3012 and the normally-closed contact switch 201 is the length D1 of the bolt 6 to be screwed, when the normally-closed contact switch 201 is extruded and the power supply circuit of the motor is disconnected, the length of the bolt 6 to be screwed is screwed, the screwing precision of the bolt 6 is met, and the condition of excessive screwing of the bolt 6 is reduced.

The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.

In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.

Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.

Claims

1. A bolt screwing tool, comprising:

the switch assembly comprises a normally-closed contact switch and a locking piece, the normally-closed contact switch is arranged in a power supply circuit of the motor and is connected in series with the motor, the normally-closed contact switch is movably arranged on the electric wrench body along the axial direction of the bolt sleeve, and the locking piece can be used for locking the normally-closed contact switch in a releasable manner so as to allow or limit the movement of the normally-closed contact switch; and

2. The bolt screwing tool according to claim 1, wherein a front end of the abutment rod protrudes from the bolt sleeve in an axial direction of the bolt sleeve.

3. The bolt screwing tool according to claim 1, wherein the switch assembly further comprises a slider and a rail extending in an axial direction of the bolt sleeve, the rail being mounted on the electric wrench body, the slider being slidably connected to the rail, the normally closed contact switch being mounted on the slider, the lock being capable of releasably locking the slider in any position on the rail.

4. A bolt screwing tool according to claim 3, wherein the guide rail is provided with a plurality of graduation marks arranged at intervals along the extending direction of the guide rail.

5. A bolt screwing tool according to claim 3 wherein the cross section of the guide rail is T-shaped, the slider is formed with a T-shaped groove in sliding engagement with the guide rail, the locking member comprises a threaded abutment rod which is in threaded connection with the slider, one end of the threaded abutment rod is located outside the slider, and the other end of the threaded abutment rod can extend into the T-shaped groove and abut against the outer surface of the guide rail.

6. The bolt screwing tool according to claim 5, wherein an end face of the threaded abutment bar near the guide rail is formed as a friction face.

7. The bolt screwing tool according to any one of claims 1 to 6, wherein the abutment assembly further comprises a guide holder mounted on the electric wrench body, a guide hole is formed in the guide holder, the diameter of the guide hole is adapted to the outer diameter of the abutment rod, and the abutment rod movably penetrates through the guide hole.

8. The bolt screwing tool according to claim 7, wherein the abutting rod comprises a rod body and a contact block, the rod body is arranged through the guide hole in a penetrating manner, and the contact block is positioned at one end of the rod body, which is close to the normally-closed contact switch, and is used for being in contact with the normally-closed contact switch;

9. The bolt screwing tool according to claim 8, wherein the elastic member is a spring that is sleeved on a portion of the rod body between the guide holder and the contact block.

10. The bolt screwing tool according to any one of claims 1 to 6, wherein an end of the abutting rod near the normally closed contact switch is provided with a cushion pad.