CN221677035U - Electric screw driver - Google Patents

Abstract

The utility model discloses an electric screwdriver which comprises a motor, a power supply, a self-locking output device, a rotation adjusting device, a torsion device, a connecting rod, a steel ball sleeve, a first steel ball group, a trigger piece and a micro switch, wherein the motor is connected with the steel ball sleeve, the steel ball sleeve is provided with a through hole, the first steel ball group is embedded in the through hole, one end of the first steel ball group is embedded on the torsion device, the self-locking output device is provided with a groove, the other end of the first steel ball group is embedded on the groove, one end of the trigger piece is connected with the torsion device, the other end of the trigger piece is opposite to the micro switch, the micro switch and the power supply are electrically connected with the motor, and the rotation adjusting device is arranged on the self-locking output device and connected with the torsion device through the connecting rod. When the screw is screwed, the screw can be stopped to rotate in time, so that the damage probability to parts is reduced.

Description

Electric screw driver

Technical Field

The utility model relates to the field of screwdriver design, in particular to an electric screwdriver.

Background

A power screwdriver, also called an electric screwdriver, a power screwdriver or a power screwdriver, is a power tool for screwing or unscrewing screws. The common electric screw driver is mostly handheld, is provided with a screwdriver head and a switch on the electric screw driver, and is internally provided with a power supply and a motor, and a user can enable the power supply to supply power for the motor by triggering the switch, so that the motor rotates to drive the screwdriver head to rotate.

CN208342688U discloses a torque-adjustable electric screwdriver, which can adjust the torque to adapt to different use needs. However, in practical use, when the screw is screwed in place, the electric screwdriver still can apply torsion to the screw, and the screw and the part locked into the screw are easily damaged.

In addition, there are some electric screwdrivers with self-locking devices on the market, and the electric screwdrivers can be used for electrically screwing or unscrewing screws and manually screwing or unscrewing screws, but the electric screwdrivers cannot be used for adjusting the torque by adopting the torque adjusting device of the torque-adjustable electric screwdrivers, so that the electric screwdrivers are inconvenient to use.

Disclosure of utility model

The present utility model aims to provide an electric screwdriver which can solve one or more of the above problems.

According to one aspect of the utility model, an electric screwdriver is provided, which comprises a motor, a power supply, a self-locking output device, a rotation adjusting device, a torsion device, a connecting rod, a steel ball sleeve, a first steel ball group, a trigger piece and a micro switch, wherein the motor is connected with the steel ball sleeve, the steel ball sleeve is provided with a through hole, the first steel ball group is embedded in the through hole, one end of the first steel ball group is embedded on the torsion device, the self-locking output device is provided with a groove, the other end of the first steel ball group is embedded on the groove, one end of the trigger piece is connected with the torsion device, the other end of the trigger piece is opposite to the micro switch, the micro switch and the power supply are electrically connected with the motor, and the rotation adjusting device is arranged on the self-locking output device and is connected with the torsion device through the connecting rod.

The beneficial effects of the utility model are as follows: according to the self-locking output device, the screwdriver head can be arranged on the self-locking output device, the motor can drive the steel ball sleeve to rotate, and power is transmitted to the self-locking output device by means of the first steel ball group, so that the self-locking output device rotates, and the screwdriver head rotates to be used for screwing or unscrewing a screw. When the screw is sufficiently screwed, namely the screw cannot rotate any more, the self-locking output device is limited by the screw and cannot rotate any more, the first steel ball group can be separated from the groove on the self-locking output device due to the torsion transmitted by the motor so as to push the torsion device to move, and a trigger piece connected with the torsion device can trigger the micro switch to stop the motor, so that after the screw is screwed in place by using the self-locking device, the screw can be stopped from rotating continuously in time, and the damage to the screw and the parts locked into the screw is reduced. On the other hand, the utility model is provided with the connecting rod, and a user can adjust the torsion device by rotating the rotation adjusting device so as to adapt the torsion output of the utility model to different use requirements.

In some embodiments, the self-locking output device comprises an output shaft, a self-locking seat, a roller and a nest claw, wherein a cavity is formed in the self-locking seat, the output shaft is provided with a plurality of protruding blocks, the protruding blocks are arranged in the cavity, gaps are formed between the adjacent protruding blocks, the gaps are provided with a high part and a low part, the roller is arranged in the gaps and can be in contact with the inner wall of the cavity, the nest claw is provided with a bearing bush, the bearing bush extends into the gaps, and the groove is formed in the nest claw.

In some embodiments, the torsion device comprises a spring pressing sleeve, a jumping pressing sleeve and a spring set, the jumping pressing sleeve is provided with a first annular groove, one end of the first steel ball set is embedded on the first annular groove, the other end of the first steel ball set is embedded on a groove of the nest claw, an accommodating cavity is arranged in the jumping pressing sleeve, an avoidance gap communicated with the accommodating cavity is arranged on the lateral part of the jumping pressing sleeve, the spring set is arranged in the accommodating cavity, the spring pressing sleeve and the jumping pressing sleeve are both connected with the spring set, a first clamping block is arranged on the spring pressing sleeve, and the first clamping block penetrates through the avoidance gap and is connected with the connecting rod. Therefore, the compression amount of the spring group can be changed by moving the spring pressing sleeve, and the arrangement of the avoidance notch can prevent the jumping pressing sleeve from obstructing the movement of the first clamping block of the spring pressing sleeve.

In some embodiments, the utility model further comprises a second steel ball group, the nest claw is provided with a steel ball groove, the self-locking seat is provided with a second annular groove, one end of the second steel ball group is embedded in the steel ball groove, and the other end of the second steel ball group is embedded in the second annular groove. The second steel ball group can enable friction between the nest claw and the self-locking seat to be rolling friction when the nest claw rotates, so that abrasion caused by sliding friction generated by contact between the nest claw and the self-locking seat is reduced.

In some embodiments, the rotation adjusting device comprises a rotating ring, a pull sleeve and a force adjusting knob, wherein the rotating ring is installed on the self-locking output device through threaded fit, the force adjusting knob is sleeved on the rotating ring, the pull sleeve is sleeved on the rotating ring, and the pull sleeve is connected with the connecting rod. Therefore, a user can rotate the force adjusting knob to enable the rotating ring to rotate, the rotating ring is installed on the self-locking output device in a threaded fit mode, and when the pull sleeve is limited by the shell, the rotating ring can drive the pull sleeve to linearly move through rotation.

In some embodiments, the utility model further comprises an inner shell and an outer shell, wherein the motor, the power supply, the trigger piece and the micro switch are all arranged in the inner shell, the outer shell is sleeved on the inner shell, the self-locking output device is provided with a first bulge, the torsion device is provided with a second bulge, the outer shell is internally provided with a first limit groove and a second limit groove, the first bulge and the second bulge penetrate through the inner shell and are embedded on the first limit groove, and the rotation adjusting device and the connecting part of the torsion device and the connecting rod are embedded on the second limit groove. The first limiting groove can limit the first bulge and the second bulge, and can guide the movement of the first bulge and the second bulge to a certain extent, and the second limiting groove can limit and guide the movement of the rotating adjusting device and the part of the torsion device connected with the connecting rod.

In some embodiments, the utility model further comprises a positive and negative control switch mounted on the inner housing, the positive and negative control switch being electrically connected to the motor. The positive and negative control switch is arranged to facilitate the user to control the positive rotation and the negative rotation of the motor.

In some embodiments, the inner housing is provided with a recess, and the trigger is embedded in the recess. The recess can play a limiting role on the movement of the trigger piece, so that the movement accuracy of the trigger piece is ensured.

In some embodiments, the utility model further comprises a rear cover mount and a bearing, the bearing mounted on the outer housing, the rear cover mount mounted on the bearing. Therefore, the rear cover seat can rotate relative to the outer shell, and the rear cover seat can be contacted with the palm of a user and the like when the screw is screwed or unscrewed, so that the probability of injury caused by rotation of the palm and the like due to rotation of the screw is reduced.

Drawings

Fig. 1 is a schematic view of a structure of an electric screwdriver according to an embodiment of the present utility model.

Fig. 2 is a cross-sectional view showing a schematic configuration of an electric screwdriver according to an embodiment of the present utility model.

Fig. 3 is an exploded view showing a structural schematic of an electric screwdriver according to an embodiment of the present utility model.

Fig. 4 is a schematic view of the structure of the electric screwdriver according to an embodiment of the present utility model without the inner and outer housings.

Fig. 5 is a cross-sectional view of a self-locking output device of an electric screwdriver according to an embodiment of the present utility model.

Fig. 6 is a schematic structural view of an output shaft of an electric screwdriver according to an embodiment of the present utility model.

Fig. 7 is a schematic structural view of a self-locking seat of an electric screwdriver according to an embodiment of the present utility model.

Fig. 8 is a schematic view of the structure of the socket claw of the electric screwdriver according to an embodiment of the present utility model.

Fig. 9 is a schematic view of the structure of the socket claw of the electric screwdriver according to one embodiment of the present utility model.

Fig. 10 is a schematic structural view of a pull sleeve of an electric screwdriver according to an embodiment of the present utility model. Fig. 11 is a schematic structural view of a spring pressing sleeve of an electric screwdriver according to an embodiment of the present utility model.

Fig. 12 is a schematic structural view of a jumping press sleeve of an electric screwdriver according to an embodiment of the present utility model.

Fig. 13 is a schematic structural view of a steel ball sleeve of an electric screwdriver according to an embodiment of the present utility model.

Fig. 14 is a schematic view showing the structure of an inner housing of a power screwdriver according to an embodiment of the present utility model.

Fig. 15 is a schematic view showing the structure of an outer case of a power screwdriver according to an embodiment of the present utility model.

In the figure: 1. the electric power source comprises a motor, 2 parts of a power source, 3 parts of a self-locking output device, 4 parts of a rotary adjusting device, 5 parts of a torsion device, 6 parts of a connecting rod, 7 parts of a steel ball sleeve, 80 parts of a first steel ball group, 8 parts of a first steel ball, 9 parts of a second steel ball, 10 parts of a trigger, 11 parts of a micro switch, 12 parts of a second steel ball group, 13 parts of an inner shell, 14 parts of an outer shell, 15 parts of a positive and negative control switch, 16 parts of a rear cover seat, 17 parts of a bearing, 31 parts of an output shaft, 32 parts of a self-locking seat, 33 parts of a rolling shaft, 34 parts of a socket claw, 311 parts of a lug, 312 parts of a hollow, 3121 parts of a high part, 3122 parts of a low part, 321 parts of a second annular groove, 322 parts of a first bulge, 341 parts of a bearing bush, 342 parts of a groove 343 parts of a steel ball groove, 41 parts of a rotary ring, 42 parts of a pull sleeve, 43 parts of a force adjusting knob, 421 parts of a second clamping block, 51 parts of a spring sleeve, 52 parts of a spring sleeve, 53 parts of a spring sleeve, 511 parts of a first clamping block, 521 parts of a first clamping block, 522 parts of a containing cavity, 523 parts of the recess, 524 parts of a recess, a second bulge, 71 parts of a second bulge, a second bulge, and a second bulge.

Detailed Description

The utility model is described in further detail below with reference to the accompanying drawings.

Referring to fig. 1 to 15, the electric screwdriver of the utility model comprises a motor 1, a power supply 2, a self-locking output device 3, a rotation adjusting device 4, a torsion device 5, a connecting rod 6, a steel ball sleeve 7, a first steel ball group 80, a trigger piece 10 and a micro switch 11.

The steel ball sleeve 7 is provided with a rotating shaft which is fixedly sleeved on the output shaft of the motor 1, so that the steel ball sleeve 7 is fixedly connected with the motor 1, and the motor 1 can drive the steel ball sleeve 7 to rotate. The steel ball sleeve 7 is provided with a steel ball disc, a through hole 71 is arranged in the steel ball disc, the first steel ball group 80 preferably comprises a first steel ball 8 and a second steel ball 9, the first steel ball 8 and the second steel ball 9 are embedded in the through hole 71, the first steel ball 8 and the second steel ball 9 can be contacted with the inner wall of the through hole 71, one end of the first steel ball 8 is abutted with one end of the second steel ball 9, and accordingly the first steel ball 8 and the second steel ball 9 can rotate along with rotation of the steel ball sleeve 7.

The torsion device 5 includes a spring press sleeve 51, a runout press sleeve 52 and a spring set 53. The first annular groove 521 is arranged on one side of the jump pressure sleeve 52, the other end of the first steel ball 8 is embedded on the first annular groove 521, the holding cavity 522 is arranged in the jump pressure sleeve 52, and the rotating shaft of the steel ball sleeve 7 passes through the jump pressure sleeve 52 and the spring pressure sleeve 51, so that the steel ball sleeve 7 can play a certain limiting role on the movement of the jump pressure sleeve 52 and the spring pressure sleeve 51.

The lateral part that jumps the pressure cover 52 still is equipped with and dodges the breach 523 that is linked together with the holding chamber 522, and the lateral part that the spring pressed the cover 51 is equipped with first fixture block 511, and first fixture block 511 passes dodges the breach 523, and first fixture block 511 passes through buckle fixed connection with the one end of connecting rod 6, dodges the setting of breach 523 and can avoid jumping the pressure cover 52 to cause the hindrance to the removal of the first fixture block 511 of spring pressed the cover 51.

The spring group 53 is arranged in the accommodating cavity 522, the spring pressing sleeve 51 and the jumping pressing sleeve 52 are in contact connection with the spring group 53, and the spring group 53 is sleeved on the rotating shaft of the steel ball sleeve 7, so that the accommodating cavity 522 and the steel ball sleeve 7 can limit the action of the spring group 53 to a certain extent, and the spring group 53 can only contract and stretch along the rotating shaft of the steel ball sleeve 7 as far as possible. In this embodiment, the spring set 53 preferably includes a small spring and a large spring, one end of the small spring of the spring set 53 abuts against the jumping press sleeve 52 to be connected therewith, the other end abuts against the spring press sleeve 51 to be connected therewith, the large spring is located in the small spring, and when the small spring is compressed to a certain extent, the large spring can also abut against the jumping press sleeve 52 and the spring press sleeve 51 respectively, and the large spring can act when the utility model needs to provide a larger torsion force, so that the torsion force adjustable range of the utility model is increased.

The self-locking output device 3 comprises an output shaft 31, a self-locking seat 32, a roller 33 and a nest claw 34. The self-locking seat 32 is internally provided with a cavity, the side part of the output shaft 31 is provided with a plurality of protruding blocks 311, the number of the protruding blocks 311 is preferably three, the three protruding blocks 311 are all arranged in the cavity, gaps 312 are arranged between the adjacent protruding blocks 311, namely, the number of the gaps 312 is also three, each gap 312 is internally provided with a high portion 3121 and a low portion 3122, the number of the rolling shafts 33 is preferably six, each gap 312 is internally provided with two rolling shafts 33, all the rolling shafts 33 can be in contact with the inner wall of the cavity, one side of each nest claw 34 is provided with a bearing bush 341, the number of the bearing bushes 341 is preferably three, the three bearing bushes 341 respectively extend into the three gaps 312, and the bearing bush 341 in each gap 312 is arranged between the two rolling shafts 33 in the gaps 312.

The other side of the nest claw 34 is provided with a groove 342, the other end of the second steel ball 9 is embedded on the groove 342, namely, one end of the first steel ball group 80 is embedded on the first annular groove 521 of the jumping press sleeve 52, and the other end is embedded on the groove 342 of the nest claw 34.

In order to reduce friction between the socket claw 34 and the self-locking seat 32, the electric screwdriver of the utility model further comprises a second steel ball group 12, wherein the socket claw 34 is further provided with a steel ball groove 343 on the side provided with the bearing bush 341, the bottom of the self-locking seat 32 is further provided with a second annular groove 321, one end of the second steel ball group 12 is embedded in the steel ball groove 343, and the other end is embedded in the second annular groove 321.

The rotation adjustment device 4 comprises a rotation ring 41, a pull sleeve 42 and a force adjustment knob 43. The lateral part of the self-locking seat 32 is also provided with external threads, the rotary ring 41 is internally provided with internal threads, the rotary ring 41 is installed on the self-locking seat 32 of the self-locking output device 3 through the threaded fit of the internal threads and the external threads, the force adjusting knob 43 is fixedly sleeved on the rotary ring 41, the pull sleeve 42 is sleeved on the rotary ring 41, the lateral part of the pull sleeve 42 is provided with a second clamping block 421, and the second clamping block 421 is fixedly connected with the other end of the connecting rod 6 through a clamping buckle.

The electric screwdriver of the present utility model further comprises an inner housing 13 and an outer housing 14. The outer shell 14 is fixedly sleeved on the inner shell 13 through a snap fit, the body of the motor 1 is fixedly sleeved in the inner shell 13 through a clamping block, the power supply 2 is fixedly sleeved in the inner shell 13 through a clamping block, the inner shell 13 is provided with a concave 131, the trigger piece 10 is sleeved in the inner shell 13, and the micro switch 11 is fixedly sleeved in the inner shell 13 through a clamping block.

The front end of the trigger piece 10 is connected with the jumping press sleeve 52 of the torsion device 5 and limits the limit position of the front movement, the rear end of the trigger piece 10 is opposite to the micro switch 11 and contacts with the micro switch 11 and limits the limit position of the rear movement, so that when the trigger piece 10 slightly displaces, the trigger piece 10 can trigger the micro switch 11 to act, and the micro switch 11 and the power supply 2 are connected with the motor 1 through leads and are electrically connected.

The inner housing 13 is also provided with a hole 133, and the connecting rod 6 is located in the hole 133. The lateral part of the self-locking seat 32 of the self-locking output device 3 is provided with a first bulge 322, the lateral part of the jumping press sleeve 52 of the torsion device 5 is provided with a second bulge 524, the outer shell 14 is internally provided with a first limit groove 141, the first bulge 322 and the second bulge 524 all penetrate through the inner shell 13, and the first bulge 322 and the second bulge 524 are all embedded in the first limit groove 141, then under the normal state, the self-locking seat 32 and the jumping press sleeve 52 are limited on the outer shell 14, and when the jumping press sleeve 52 can move, the first limit groove 141 can play a certain guiding role on the movement of the jumping press sleeve 52.

Meanwhile, a second limiting groove 142 is further formed in the outer shell 14, and the first clamping block 511 of the spring pressing sleeve 51 and the second clamping block 421 of the pulling sleeve 42 are embedded in the second limiting groove 142, namely, the parts connected with the rotation adjusting device 4 and the torsion device 5 and the connecting rod 6 are embedded in the second limiting groove 142, so that the spring pressing sleeve 51 and the pulling sleeve 42 can linearly move along the second limiting groove 142 under the limiting of the second limiting groove 142 to ensure the moving accuracy.

The electric screwdriver also comprises a positive and negative control switch 15. The positive and negative control switch 15 is installed on the inner shell 13, and the positive and negative control switch 15 is connected with the motor 1 through a wire and is electrically connected, and the positive and negative control switch 15 is provided with a positive rotation switch and a reverse rotation switch for correspondingly controlling the positive rotation and the reverse rotation of the motor 1.

The electric screwdriver of the present utility model further comprises a rear cover seat 16 and a bearing 17. The bearing 17 is sleeved on the outer shell 14, and the rear cover seat 16 is mounted on the bearing 17, so that the rear cover seat 16 can rotate on the outer shell 14.

When the electric screwdriver is used, a screwdriver head is arranged on the output shaft 31 of the self-locking output device 3, a user can correspondingly trigger the motor 1 to rotate forward or reversely by pressing the forward and reverse control switch 15 to turn on or off or reverse the switch, the rotation of the motor 1 can drive the steel ball sleeve 7 to rotate, the rotation of the steel ball sleeve 7 can drive the first steel ball 8 and the second steel ball 9 to rotate together, the second steel ball 9 can transmit power to the socket claw 34 to enable the socket claw 34 to rotate, the rotation of the socket claw 34 can stir the roller 33, the roller 33 can move to the lower part in the empty space 312, at the moment, the roller 33 is in loose contact with the inner wall of the cavity of the self-locking seat 32, namely, the socket claw 34 can drive the output shaft 31 to rotate relative to the self-locking seat 32 through the roller 33, so that the screwdriver head arranged on the output shaft 31 can rotate forward or reverse, and screwing or unscrewing of the screw can be realized.

When the torque force of the electric screwdriver needs to be adjusted, a user can rotate the force adjusting knob 43 to drive the rotating ring 41 to rotate on the self-locking seat 32, the rotating ring 41 and the self-locking seat 32 are in threaded fit, the rotating ring 41 moves axially to a certain extent along the self-locking seat 32, the pull sleeve 42 and the spring pressing sleeve 51 move only along with the rotation of the rotating ring 41 under the limitation of the second limiting groove 142, the axial movement of the pull sleeve 42 can drive the spring pressing sleeve 51 to move axially through the connecting rod 6, the spring pressing sleeve 52 is fixed at the moment, the spring group 53 can be correspondingly stretched or compressed by the movement of the spring pressing sleeve 51, so that the pressure applied by the spring group 53 to the spring pressing sleeve 52 is changed under the action of the spring group 53, namely the pressure applied by the spring pressing sleeve 52 to the first steel ball 8 is changed, the first steel ball 8 is connected with the second steel ball 9, the pressure applied by the second steel ball 9 to the socket 34 is changed, and the torque force is adjusted.

When the electric screwdriver is screwed in place, the screwdriver head is limited by the screw and cannot continue to rotate effectively, namely, the output shaft 31 cannot continue to rotate, so that the socket claw 34 cannot continue to rotate, but because the motor 1 can continue to output power, the motor 1 still drives the steel ball sleeve 7 to rotate, namely, the second steel ball 9 can rotate along with the motor, so that the second steel ball 9 and the socket claw 34 can displace relatively, the second steel ball 9 can be separated from the groove 342, at the moment, the second steel ball 9 can directly prop against the surface of the socket claw 34, the socket claw 34 is connected with the self-locking seat 32 through the second steel ball group 12 in the axial direction, the self-locking seat 32 is fixed on the outer shell 14, so that the socket claw 34 does not move, the second steel ball 9 reversely pushes the jump sleeve 52 to do certain axial movement, the follow-up trigger piece 10 connected with the jump sleeve 52 triggers the micro switch 11, the micro switch 11 is triggered to stop the work of the motor 1, so that the continuous output of the electric screwdriver can be reduced, the damage to the screw and the electric screwdriver can rotate along with the groove 342, and the second steel ball 9 can rotate in the groove 7, namely, when the electric screwdriver is reset to rotate in the groove 7, and the second steel ball sleeve 7 can rotate normally, namely, the second steel ball 7 can rotate in the groove 7 is reset.

On the other hand, since the present utility model is used by supplying power to the motor 1 by means of the power source 2, the present utility model can be used manually by providing the self-locking output device 3, in particular, when the user rotates the outer housing 14 manually, the self-locking seat 32 rotates with it, the self-locking seat 32 can push the roller 33 to roll due to contact with the roller 33, when the roller 33 rolls to the high portion 3121 of the empty space 312, the roller 33 can be blocked by the self-locking seat 32 and the output shaft 31, the roller 33 can not rotate any more, and at this time, the rotation of the self-locking seat 32 can drive the output shaft 31 to rotate, so as to realize manual screwing or unscrewing of the screw.

What has been described above is merely some embodiments of the present utility model. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the utility model.

Claims (9)

1. The electric screwdriver is characterized by comprising a motor, a power supply, a self-locking output device, a rotation adjusting device, a torsion device, a connecting rod, a steel ball sleeve, a first steel ball group, a trigger piece and a micro switch, wherein the motor is connected with the steel ball sleeve, the steel ball sleeve is provided with a through hole, the first steel ball group is embedded in the through hole, one end of the first steel ball group is embedded on the torsion device, the self-locking output device is provided with a groove, the other end of the first steel ball group is embedded on the groove, one end of the trigger piece is connected with the torsion device, the other end of the trigger piece is opposite to the micro switch, the micro switch and the power supply are electrically connected with the motor, and the rotation adjusting device is installed on the self-locking output device and connected with the torsion device through the connecting rod.

2. The electric screwdriver according to claim 1, wherein the self-locking output device comprises an output shaft, a self-locking seat, a roller and a socket claw, wherein a cavity is formed in the self-locking seat, the output shaft is provided with a plurality of protruding blocks, the protruding blocks are arranged in the cavity, gaps are formed between the adjacent protruding blocks, the gaps are provided with a high part and a low part, the roller is arranged in the gaps and can be in contact with the inner wall of the cavity, the socket claw is provided with a bearing bush, the bearing bush stretches into the gaps, and the groove is formed in the socket claw.

3. The electric screwdriver according to claim 2, wherein the torsion device comprises a spring pressing sleeve, a jumping pressing sleeve and a spring set, the jumping pressing sleeve is provided with a first annular groove, one end of the first steel ball set is embedded in the first annular groove, the other end of the first steel ball set is embedded in a groove of the socket claw, a containing cavity is arranged in the jumping pressing sleeve, a avoiding gap communicated with the containing cavity is arranged on the lateral part of the jumping pressing sleeve, the spring set is arranged in the containing cavity, the spring pressing sleeve and the jumping pressing sleeve are both connected with the spring set, the spring pressing sleeve is provided with a first clamping block, and the first clamping block penetrates through the avoiding gap and is connected with the connecting rod.

4. The electric screwdriver according to claim 2, comprising a second steel ball group, wherein the socket claw is provided with a steel ball groove, the self-locking seat is provided with a second annular groove, one end of the second steel ball group is embedded in the steel ball groove, and the other end of the second steel ball group is embedded in the second annular groove.

5. The electric screwdriver according to claim 1, wherein the rotation adjusting device comprises a rotating ring, a pull sleeve and a force adjusting knob, the rotating ring is mounted on the self-locking output device through threaded fit, the force adjusting knob is sleeved on the rotating ring, the pull sleeve is sleeved on the rotating ring, and the pull sleeve is connected with the connecting rod.

6. The electric screwdriver according to claim 1, comprising an inner housing and an outer housing, wherein the motor, the power source, the trigger and the micro switch are all disposed in the inner housing, the outer housing is sleeved on the inner housing, the self-locking output device is provided with a first protrusion, the torsion device is provided with a second protrusion, the outer housing is provided with a first limit groove and a second limit groove, the first protrusion and the second protrusion are all penetrated through the inner housing and are embedded on the first limit groove, and the rotation adjusting device and the connecting part of the torsion device with the connecting rod are all embedded on the second limit groove.

7. The electric screwdriver of claim 6, comprising a forward and reverse control switch mounted on the inner housing, the forward and reverse control switch being electrically connected to the motor.

8. The power screwdriver of claim 6, wherein the inner housing is provided with a recess, and the trigger is embedded in the recess.

9. The powered screwdriver of claim 6, comprising a rear cover mount and a bearing, the bearing mounted on the outer housing, the rear cover mount mounted on the bearing.