CN218397961U

CN218397961U - Impact electric drill

Info

Publication number: CN218397961U
Application number: CN202121773524.6U
Authority: CN
Inventors: 黄海彬; 施宏敏; 戴磊磊
Original assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Current assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2023-01-31
Anticipated expiration: 2031-07-30

Abstract

An electric impact drill comprises a shell, a transmission mechanism and an output shaft which are positioned in the shell, and a mode switching mechanism and a torque force adjusting mechanism which are connected with the transmission mechanism, wherein the transmission mechanism comprises a front shell which extends forwards. The mode switching mechanism comprises an annular support axially fixed on the output shaft and a mode switching piece axially fixed on the periphery of the front shell, and the torque adjusting mechanism comprises a skip piece circumferentially fixed on the front shell and used for limiting torque output of the output shaft. The annular support is provided with a clamping arm extending backwards, the mode switching piece is provided with a limiting groove positioned on the inner edge and a limiting part protruding backwards from the outer edge, the trip blocking piece is provided with a trip blocking groove positioned on the outer edge, the limiting groove is arranged corresponding to the clamping arm, and the limiting part is arranged corresponding to the trip blocking groove. The impact electric drill has the advantages of convenient use, reliable function, effective solving of the problem of gear jumping, three gear functions and convenient switching; the mode switching piece controls three gears separately, and convenience and operation safety are effectively improved.

Description

Impact electric drill

[ technical field ]

The utility model relates to an electric impact drill, in particular to electric impact drill convenient to mode switch.

[ background Art ]

The current percussion drill usually has several working modes, such as an electric drill, a screw driver, a percussion drill and the like. When the screwdriver gear is used, the control gear must be adjusted to the screwdriver gear; at this time, the impact drill determines when to trip the gear according to the torque setting of the screwdriver gear, and the rotation motor of the impact drill continuously rotates during the gear trip, but the screwdriver keeps a static state, and the impact drill cannot output the maximum torque. When the electric drill gear is used, the rotary motor and the front end drill bit always keep the same action, the maximum torque force is output, and the gear jumping is kept. When the impact gear is used, the original electric drill gear function is kept, and the impact mechanism is started to provide an impact effect at the same time, so that the drilling operation can be more efficiently carried out on a cement wall or other hard objects. In order to meet different requirements for operation and adjustment, an impact switching device is usually designed between the motor and the front end fitting to achieve the requirement of mechanical operation adjustment.

The mode switching and the torque force adjusting ring of the existing impact drill are integrated, the torque force adjusting ring needs to be rotated in a whole ring when the mode switching and the torque force adjusting ring need to be switched to an electric drill gear or an impact gear, the switching is inconvenient, the torque force output of the existing gear box of the impact drill is controlled in a mode that a spring presses an inner gear ring, and meanwhile, the control of the compression amount of the spring is realized in a thread width mode. However, the drawbacks of this approach are: screw batch keeps off, electric drill keeps off, strikes and keeps off all with the screw thread width of cloth, strikes and keeps off for last fender, and the electric drill keeps off for the penultimate degree and keeps off, keeps off to carry out screw thread operation when strikeing to keep off soon by the electric drill and needs certain clearance to very easily lead to jumping to keep off the problem.

Accordingly, there is a need for an improved electric impact drill that overcomes the deficiencies of the prior art.

[ contents of utility model ]

To the deficiency of the prior art, an object of the utility model is to provide an electric impact drill, this electric impact drill's mode switch structure simple structure, convenient assembling and low in manufacturing cost.

The utility model provides a technical scheme that prior art problem adopted is: an impact electric drill comprising a housing, a transmission mechanism located in the housing, an output shaft driven by the transmission mechanism and a mode switching mechanism and a torque adjustment mechanism connected to the transmission mechanism, the transmission mechanism including a gearbox housing and a front housing extending forwardly from the gearbox housing, the output shaft being supported in the front housing and rotating about an axis. The mode switching mechanism comprises an annular bracket axially fixed on the output shaft and a mode switching piece positioned behind the annular bracket, and the mode switching piece is axially fixed on the periphery of the front shell and rotates relative to the front shell. The torsion adjusting mechanism comprises a trip plate circumferentially fixed on the front shell, and the trip plate is abutted against the front end face of the gearbox shell and used for limiting the torque output of the output shaft. The annular support is provided with a clamping arm extending from the outer edge to the mode switching piece, the mode switching piece is provided with a limiting groove located at the inner edge and a limiting part protruding backwards from the outer edge, the jump block piece is located behind the mode switching piece and is provided with a jump block groove located at the outer edge, the limiting groove is arranged corresponding to the clamping arm, and the limiting part is arranged corresponding to the jump block groove. The mode switching piece rotates to enable the electric impact drill to switch gears, when the limiting groove of the mode switching piece is aligned with the clamping arm and is jointed, the electric impact drill is in an impact gear, and when the limiting portion of the mode switching piece is aligned with the trip gear groove and is jointed, the electric impact drill is in a screwdriver gear.

The further improvement scheme is as follows: when the impact electric drill is in an impact gear, the clamping arm is aligned to and engaged with the limiting groove to allow the output shaft to axially displace, and the limiting part is staggered with the jump block groove and abuts against the front end face of the jump block piece to limit the axial displacement of the jump block piece.

The further improvement scheme is as follows: the electric impact drill including hold in the impact subassembly in the procapsid, the impact subassembly include fixed connection in on the output shaft and with the output shaft co-rotation move the ratchet and be fixed in quiet ratchet in the procapsid, when the electric impact drill is in the impact gear, the output shaft drives move the ratchet along axial motion, in order to allow move the ratchet with quiet ratchet joint.

The further improvement scheme is as follows: when the electric impact drill is in a screwdriver gear, the limiting part is aligned with and engaged with the trip blocking groove to allow the trip blocking piece to axially displace, and the clamping arm is staggered with the limiting groove and is abutted against the front end face of the mode switching piece to limit the axial displacement of the output shaft.

The further improvement scheme is as follows: the transmission mechanism comprises an inner gear ring and a pin column, the inner gear ring is located in the gear box shell, the pin column is accommodated in the through hole, the inner gear ring is axially fixed in the gear box shell, the pin column is located between the jump block piece and the inner gear ring, and two axial ends of the pin column respectively abut against the rear end face of the jump block piece and the front end face of the inner gear ring.

The further improvement scheme is as follows: the inner gear ring is provided with a boss protruding forwards from the front end face, when the electric impact drill is not in a screwdriver gear, the limiting portion is staggered with the jump stop groove and abuts against the front end face of the jump stop piece, at the moment, the jump stop piece is axially fixed, and the rear end of the pin post abuts against and blocks the boss of the inner gear ring so as to prevent the inner gear ring from rotating relative to the front shell.

The further improvement scheme is as follows: when the impact electric drill is in a screwdriver gear, the trip stop piece moves axially to allow the pin to move axially in the through hole, and when the inner gear ring rotates relative to the front shell, the pin moves axially in the through hole and spans the boss.

The further improvement scheme is as follows: the torque adjusting mechanism comprises a torque adjusting ring and a spring, the torque adjusting ring is located at the front end of the mode switching piece, the spring is located between the torque adjusting ring and the skip blocking piece, the torque adjusting ring has axial movement relative to the front shell, and pretightening force is applied to the skip blocking piece through the spring.

The further improvement scheme is as follows: the electric impact drill is in a screwdriver gear, when the inner gear ring overcomes the pretightening force, the inner gear ring rotates relative to the front shell, and the inner gear ring pushes the jump stopping piece to move axially through the boss and the pin column.

The further improvement scheme is as follows: the electric impact drill further comprises an electric drill gear between the electric impact gear and the screwdriver gear, when the electric impact drill is in the electric drill gear, the clamping arm is staggered with the limiting groove and abutted against the front end face of the mode switching piece to limit axial displacement of the output shaft, and the limiting portion is staggered with the skip groove and abutted against the front end face of the skip blocking piece to limit axial displacement of the skip blocking piece.

Compared with the prior art, the utility model discloses following beneficial effect has: the annular support is provided with a clamping arm extending from the outer edge to the mode switching piece, the mode switching piece is provided with a limiting groove located at the inner edge and a limiting part protruding backwards from the outer edge, the trip barrier is located behind the mode switching piece and is provided with a trip groove located at the outer edge, the limiting groove and the clamping arm are arranged correspondingly, and the limiting part and the trip groove are arranged correspondingly. Impact electric drill has convenient to use, the function is reliable, effectively solves the problem of jumping to keep silent to it is convenient to have three kinds of gear functions and switch: when the limiting groove of the mode switching piece is aligned and connected with the clamping arm, the electric impact drill is in an impact gear; when the limiting part of the mode switching piece is aligned and connected with the trip groove, the impact electric drill is in a screwdriver gear; and when the limiting groove of the mode switching piece and the clamping arm are staggered and the limiting part and the trip groove are staggered, the electric impact drill is in an electric drill gear. The mode switching piece controls the impact gear, the screwdriver gear and the electric drill gear separately, a user can use the mode switching piece conveniently, and the convenience and the operation safety of the electric impact drill are effectively improved.

[ description of the drawings ]

The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings:

fig. 1 is a perspective view of an electric impact drill according to a preferred embodiment of the present invention;

FIG. 2 is a cross-sectional view of the impact drill shown in FIG. 1;

FIG. 3 is an enlarged fragmentary view of the electric impact drill shown in FIG. 2;

fig. 4 is a perspective view of an output structure of the impact drill shown in fig. 1;

FIG. 5 is a half sectional view of the output structure shown in FIG. 4;

FIG. 6 is an exploded schematic view of the output structure shown in FIG. 4;

FIG. 7 is a front elevational view of the output structure illustrated in FIG. 4 in an impact gear position;

FIG. 8 is a partial assembled view of the output structure of FIG. 7 in an impact gear position;

FIG. 9 is a partial assembled view of the output structure shown in FIG. 4 in the screwdriver position;

FIG. 10 is a front view of the output structure shown in FIG. 9 in the screwdriver position.

The meaning of the reference symbols in the figures:

100. the electric impact drill 101, the clamping device 10, the housing 11, the main body 12, the holding portion 13, the operation button 20, the motor 30, the transmission mechanism 31, the gear box housing 311, the through hole 32, the front housing 320, the accommodating cavity 321, the notch 33, the planetary gear train mechanism 34, the inner gear 341, the boss 35, the pin 40, the impact assembly 41, the output shaft 42, the movable ratchet 43, the static ratchet 50, the mode switching mechanism 51, the annular bracket 510, the retaining arm 52, the mode switching member 521, the limiting groove 522, the limiting portion 53, the mode switching cup 60, the torque adjusting mechanism 61, the torque adjusting ring 62, the trip plate 621, the trip groove 63, the spring 64, the torque adjusting cup 70, the battery pack

[ detailed description of the invention ]

Referring to fig. 1 to 2, an impact electric drill 100 according to a preferred embodiment of the present invention has three gears, namely, an impact gear, a drill gear and a screwdriver gear. The impact drill 100 includes an output structure at a front end and a gripping device 101 connected to the output structure, the gripping device 101 being for gripping a fixed tool or drill bit (not shown). In this embodiment, the output shaft 41 is coupled to the gripping device 101 in a conventional manner to rotationally drive a tool or bit.

The impact electric drill 100 includes a housing 10, a motor 20 disposed in the housing 10, a transmission mechanism 30 connected to the motor 20, an output shaft 41 driven by the transmission mechanism 30, an impact assembly 40 connected to the transmission mechanism 30, a mode switching mechanism 50, and a torque adjusting mechanism 60. The output shaft 41 extends along the axial direction, and the motor 20 drives the output shaft 41 to operate through the transmission mechanism 30 so as to rotationally drive the cutter or the drill bit.

The housing 10 includes a main body 11 extending along an axial direction and a holding portion 12 connected to a lower portion of the main body 11, and the motor 20, the transmission mechanism 30 and the striking assembly 40 are all accommodated in the main body 11. The holding portion 12 is used for holding when a user operates the electric drill and is provided with an operation button 13, and the operation button 13 is operated by the user to control the start and stop of the electric impact drill 100. The impact drill 100 further includes a battery pack 70 connected to a lower end of the grip portion 12, the battery pack 70 being used to supply power to the impact drill 100.

As shown in fig. 3, the transmission mechanism 30 includes a gear case housing 31, a front housing 32 extending forward from the gear case housing 31, and a planetary gear mechanism 33 accommodated in the gear case housing 31. The motor 20 extends forwardly into the gearbox housing 31 and engages the planetary gear set mechanism 33 to drive the planetary gear set mechanism 33 into operation. The gear box shell 31 is provided with a through hole 311 penetrating through the gear box shell 31 from the front end face, and the transmission mechanism 30 comprises an inner gear ring 34 positioned in the gear box shell 31 and a pin 35 accommodated in the through hole 311. The inner gear ring 34 is axially fixed in the gear box shell 31 and is provided with a boss 341 protruding forwards from the front end face, and the pin 35 is located in front of the inner gear ring 34 and abuts against the front end face or the boss 341 of the inner gear ring 34.

The front housing 32 is provided with an accommodating cavity 320 recessed backward from the front end surface and a notch 321 located in the circumferential direction of the front housing 32 and penetrating through the front end surface, the notch 321 communicates with the accommodating cavity 320, and the output shaft 41 is supported in the accommodating cavity 320 of the front housing 32 and rotates around an axis. The impacted component 40 is accommodated in the accommodating cavity 320 of the front housing 32 and comprises a movable ratchet wheel 42 fixedly connected to the output shaft 41 and a static ratchet wheel 43 fixed in the front housing 32, wherein the movable ratchet wheel 42 is positioned in front of the static ratchet wheel 43. The movable ratchet wheel 42 rotates together with the output shaft 41, i.e. the output shaft 41 can drive the movable ratchet wheel 42 to move axially relative to the fixed ratchet wheel 43 to engage.

Referring to fig. 4 to 6, the mode switching mechanism 50 includes an annular bracket 51 axially fixed on the output shaft 41, a mode switching member 52 located behind the annular bracket 51, and a mode switching cup 53 fixed on an outer periphery of the mode switching member 52, wherein the mode switching cup 53 rotates to drive the mode switching member 52 to rotate. The annular bracket 51 is located in the accommodating cavity 320 and is provided with a retaining arm 510 extending from the outer edge to the mode switching member 52, the retaining arm 510 extends outwards from the accommodating cavity 320 and penetrates through the notch 321, and the retaining arm 510 abuts against the inner wall of the notch 321 of the front housing 32, so that the retaining arm 510 is circumferentially fixed relative to the front housing 32.

The mode switching member 52 is axially fixed to the outer periphery of the front housing 32 and rotates relative to the front housing 32, and the mode switching member 52 rotates to switch the gear positions of the impact drill 100. The mode switching member 52 has a limiting groove 521 at the inner edge and a limiting portion 522 protruding backward from the outer edge, and the limiting groove 521 is disposed corresponding to the retaining arm 510. When the mode switch 52 is rotated until the stopper groove 521 is aligned with and engaged with the chucking arm 510, the electric impact drill 100 is in an impact range to allow the output shaft 41 to be displaced in the axial direction. When the mode switching member 52 rotates until the retaining arm 510 is dislocated from the limiting groove 521, the electric impact drill 100 is in an electric drill gear position or a screwdriver gear position, and at this time, the retaining arm 510 abuts against the front end surface of the mode switching member 52 to limit the axial displacement of the output shaft 41.

The torque adjusting mechanism 60 includes a torque adjusting ring 61 located at the front end of the mode switching member 52, a skip piece 62 circumferentially fixed to the front housing 32, a spring 63 located between the torque adjusting ring 61 and the skip piece 62, and a torque adjusting cup 64 sleeved on the periphery of the torque adjusting ring 61, wherein the torque adjusting cup 64 rotates to drive the torque adjusting ring 61 to rotate. The torsion adjusting ring 61 has an internal thread, the front housing 32 has an external thread, and the torsion adjusting ring 61 has an axial movement relative to the front housing 32 by the engagement of the internal thread and the external thread.

The trip plate 62 is located behind the mode switching member 52 and abuts against the front end surface of the gear box housing 31, two axial ends of the spring 63 respectively abut against the torsion adjusting ring 61 and the trip plate 62, and the torsion adjusting ring 61 applies a pre-tightening force to the trip plate 62 through the spring 63 for limiting the torque output of the output shaft 41. Meanwhile, the skip stop piece 62 is located in front of the pin 35, that is, the pin 35 is located between the skip stop piece 62 and the inner gear ring 34, and two axial ends of the pin 35 respectively abut against the rear end surface of the skip stop piece 62 and the front end surface of the inner gear ring 34, so that a pretightening force is applied to the inner gear ring 34.

The skip blocking sheet 62 is provided with a skip groove 621 located at the outer edge, and the limiting portion 522 is arranged corresponding to the skip groove 621. When the mode switching member 52 is rotated until the stopper portion 522 is aligned with and engaged with the trip stop groove 621, the impact drill 100 is in the screwdriver position to allow the trip stop piece 62 to be displaced in the axial direction. When the mode switching piece 52 rotates to a position where the limiting portion 522 is dislocated from the skip stop groove 621, the electric impact drill 100 is in an impact gear position or an electric drill gear position, and at this time, the limiting portion 522 abuts against the front end surface of the skip stop piece 62 to limit the axial displacement of the skip stop piece 62.

When the impact electric drill 100 is in a screwdriver gear position, the jump block piece 62 moves axially to allow the pin 35 to move axially in the through hole 311, when the inner gear ring 34 overcomes the pretightening force, the inner gear ring 34 rotates relative to the front shell 32, and the inner gear ring 34 pushes the jump block piece 62 axially through the boss 341 and the pin 35, namely, the pin 35 moves axially in the through hole 311 and crosses the boss 341. When the electric impact drill 100 is not in a screwdriver gear position, the limiting portion 522 is dislocated with the jump stop groove 621, the limiting portion 522 abuts against the front end face of the jump stop piece 62, at the time, the jump stop piece 62 is axially fixed, and then the rear end of the pin 35 abuts against and blocks the boss 341 of the ring gear 34, so that the ring gear 34 is prevented from rotating relative to the front housing 32.

Combine 7 to fig. 10 to show, electric impact drill 100 has convenient to use, the function is reliable, effectively solves the problem of jumping the fender to three kinds of gear functions and the switching convenience of impact gear, electric drill gear and screwdriver gear have. The mode switching piece 52 controls the impact gear, the screwdriver gear and the electric drill gear separately, so that a user can operate and use the electric drill conveniently, and the use convenience and the operation safety of the impact electric drill 100 are effectively improved.

Referring to fig. 7 and 8, the impact drill 100 is in an impact gear position; at this time, the retaining arm 510 is aligned with and engaged with the limit groove 521 to allow the output shaft 41 to be displaced in the axial direction, and the output shaft 41 drives the movable ratchet wheel 42 to move in the axial direction to allow the movable ratchet wheel 42 to be engaged with the fixed ratchet wheel 43, so that the impact function of the electric impact drill 100 is enabled; meanwhile, the limiting portion 522 is dislocated from the skip stop groove 621, and the limiting portion 522 abuts against the front end surface of the skip stop sheet 62 to limit the axial displacement of the skip stop sheet 62.

Referring to fig. 9 and 10, the impact drill 100 is in the screwdriver position; the stopper portion 522 is aligned with and engages the trip stop slot 621 to allow the trip stop piece 62 to be displaced axially, and the user can adjust the torque limit by rotating the torque adjustment cup 64; meanwhile, the catching arm 510 is dislocated from the limiting groove 521, and the catching arm 510 abuts against the front end surface of the mode switching member 52 to limit the axial displacement of the output shaft 41.

Referring to fig. 8 and 10, the impact drill 100 is in a drill position between the impact position and the screwdriver position; the retaining arm 510 is dislocated from the limiting groove 521, and the retaining arm 510 abuts against the front end surface of the mode switching member 52 to limit the axial displacement of the output shaft 41; the limit portion 522 is dislocated from the skip stop groove 621, and the limit portion 522 abuts against the front end surface of the skip stop sheet 62 to limit the axial displacement of the skip stop sheet 62.

In this embodiment, the annular bracket 51 is provided with a retaining arm 510 extending from the outer edge to the mode switching member 52, the mode switching member 52 is provided with a limiting groove 521 located at the inner edge and a limiting part 522 protruding backward from the outer edge, the skip stop sheet 62 is located behind the mode switching member 52 and is provided with a skip stop groove 621 located at the outer edge, the limiting groove 521 is arranged corresponding to the retaining arm 510, and the limiting part 522 is arranged corresponding to the skip stop groove 621. Electric impact drill 100 has convenient to use, the function is reliable, effectively solves the problem of jumping to keep silent to it is convenient to have three kinds of gear functions and switch: when the mode switching piece 52 rotates until the limiting groove 521 is aligned with and engaged with the retaining arm 510, the impact electric drill 100 is in an impact gear position; when the mode switching piece 52 rotates until the limiting part 522 is aligned with and engaged with the trip stop groove 621, the electric impact drill 100 is in a screwdriver gear position; when the mode switching member 52 rotates until the position-limiting groove 521 is dislocated with the retaining arm 510 and the position-limiting portion 522 is dislocated with the jump-stop groove 621, the electric impact drill 100 is in a drill gear position. The mode switching piece 52 controls the impact gear, the screwdriver gear and the electric drill gear separately, so that a user can operate and use the electric drill conveniently, and the use convenience and the operation safety of the impact electric drill 100 are effectively improved.

The present invention is not limited to the above-described embodiments. It will be readily appreciated by those skilled in the art that many alternatives to the disclosed electric impact drill may be made without departing from the spirit and scope of the invention. The protection scope of the present invention is subject to the content of the claims.

Claims

1. An impact electric drill comprising a housing, a transmission mechanism located within the housing, an output shaft driven by the transmission mechanism, the transmission mechanism comprising a gearbox housing and a front housing extending forwardly from the gearbox housing, and a mode switching mechanism and a torque adjustment mechanism connected to the transmission mechanism, the output shaft being supported within the front housing and rotating about an axis; the mode switching mechanism comprises an annular bracket axially fixed on the output shaft and a mode switching piece positioned behind the annular bracket, and the mode switching piece is axially fixed on the periphery of the front shell and rotates relative to the front shell; the torsion adjusting mechanism comprises a trip plate circumferentially fixed on the front shell, and the trip plate abuts against the front end surface of the gearbox shell and is used for limiting the torque output of the output shaft; the method is characterized in that: the annular bracket is provided with a clamping arm extending from the outer edge to the mode switching piece, the mode switching piece is provided with a limiting groove positioned at the inner edge and a limiting part protruding backwards from the outer edge, the jump block piece is positioned behind the mode switching piece and is provided with a jump block groove positioned at the outer edge, the limiting groove is arranged corresponding to the clamping arm, and the limiting part is arranged corresponding to the jump block groove; the mode switching piece rotates so that the electric impact drill can switch gears, when the limiting groove of the mode switching piece is aligned with the clamping arm and is engaged with the clamping arm, the electric impact drill is in an impact gear, and when the limiting portion of the mode switching piece is aligned with the gear jumping groove and is engaged with the gear jumping groove, the electric impact drill is in a screwdriver gear.

2. The electric impact drill of claim 1, wherein: when the electric impact drill is in an impact gear, the clamping arm is aligned to and engaged with the limiting groove to allow the output shaft to axially displace, and the limiting part is staggered with the jumping-blocking groove and abutted against the front end face of the jumping-blocking piece to limit the axial displacement of the jumping-blocking piece.

3. The impact drill of claim 2, wherein: the electric impact drill including hold in impact assembly in the procapsid, impact assembly including fixed connection in on the output shaft and with the output shaft co-rotation move the ratchet and be fixed in the quiet ratchet in the procapsid, when the electric impact drill is in the impact gear, the output shaft drives move the ratchet along axial motion, in order to allow move the ratchet with quiet ratchet joint.

4. The impact drill of claim 1, wherein: when the electric impact drill is in a screwdriver gear, the limiting part is aligned with and engaged with the trip blocking groove to allow the trip blocking piece to axially displace, and the clamping arm is staggered with the limiting groove and is abutted against the front end face of the mode switching piece to limit the axial displacement of the output shaft.

5. The impact drill of claim 1, wherein: the transmission mechanism comprises an inner gear ring positioned in the gear box shell and a pin column accommodated in the through hole, the inner gear ring is axially fixed in the gear box shell, the pin column is positioned between the jump stopping sheet and the inner gear ring, and the axial two ends of the pin column are respectively abutted against the rear end surface of the jump stopping sheet and the front end surface of the inner gear ring.

6. The electric impact drill of claim 5, wherein: the inner gear ring is provided with a boss protruding forwards from the front end face, when the electric impact drill is not in a screwdriver gear, the limiting portion is staggered with the jump stop groove and abuts against the front end face of the jump stop piece, at the moment, the jump stop piece is axially fixed, and the rear end of the pin post abuts against and blocks the boss of the inner gear ring so as to prevent the inner gear ring from rotating relative to the front shell.

7. The impact drill of claim 6, wherein: when the impact electric drill is in a screwdriver gear, the trip stop piece moves axially to allow the pin to move axially in the through hole, and when the inner gear ring rotates relative to the front shell, the pin moves axially in the through hole and spans the boss.

8. The impact drill of claim 6, wherein: the torsion adjusting mechanism comprises a torsion adjusting ring and a spring, the torsion adjusting ring is located at the front end of the mode switching piece, the spring is located between the torsion adjusting ring and the skip blocking piece, the torsion adjusting ring moves axially relative to the front shell, and pretightening force is applied to the skip blocking piece by the torsion adjusting ring through the spring.

9. The impact drill of claim 8, wherein: the impact electric drill is in a screwdriver gear, when the inner gear ring overcomes the pretightening force, the inner gear ring rotates relative to the front shell, and the inner gear ring pushes the jump block piece to move axially through the boss and the pin column.

10. The impact drill of claim 1, wherein: the electric impact drill further comprises an electric drill gear between the impact gear and the screwdriver gear, when the electric impact drill is in the electric drill gear, the clamping arm is staggered with the limiting groove and is abutted against the front end face of the mode switching piece to limit axial displacement of the output shaft, the limiting portion is staggered with the skip groove and is abutted against the front end face of the skip blocking piece to limit axial displacement of the skip blocking piece.