Electric screw driver and screw driving device with same

Abstract

The electric screw driver comprises a shell, a driving assembly, a reset button and a reset piece, the driving assembly comprises a driving motor, a rotating shaft and a push rod, the driving motor is installed on the push rod, an output shaft of the driving motor is connected with the rotating shaft, and the other end of the rotating shaft extends out of the shell and is connected with a screwdriver bit; the push rod is connected with the other side of the driving motor, a limiting protrusion is arranged on the rotating shaft, an elastic piece is arranged between the limiting protrusion and the inner wall of the cavity, and the end, away from the rotating shaft, of the push rod is connected with the ratchet wheel rotor. The reset button is provided with clamping grooves which are opened towards the push rod and arranged in the circumferential direction of the cavity at intervals, the ratchet wheel rotor is provided with clamping pieces matched with the clamping grooves, and when the ratchet wheel rotor rotates reversely relative to the reset button, the clamping pieces are disengaged from the corresponding clamping grooves. According to the electric screwdriver, the screwdriver head and the screw can be separated at the overload moment, and self-protection is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of screw driving equipment, and in particular to an electric screwdriver and a screw driving device having the same. Background Art

[0002] When using a traditional manual electric screwdriver, the moment the nut of the screw contacts the surface of the part being fastened, the inertia will cause the fastened part to continue rotating or the operator's hand to rotate with it. This process is very dangerous and can easily cause injuries to the operator's hands and wrists or cause parts to fly out, posing a safety hazard.

[0003] Therefore, designing a self-protective electric screwdriver has become an urgent problem to be solved. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention proposes an electric screwdriver, the shell of the electric screwdriver has a cavity extending along its length direction, and the two ends of the cavity are respectively provided with a first opening and a second opening, the driving motor is movably arranged in the shell, the rotating shaft is connected to the driving motor and one end thereof extends out of the first opening and is connected to the screwdriver bit, the other side of the driving motor is connected to the push rod, a limiting protrusion is provided on the rotating shaft, the side of the limiting protrusion facing the screwdriver bit is provided with an elastic member that stops between the limiting protrusion and the inner wall of the cavity, a reset button and a ratchet rotor are provided at the second opening, the end of the push rod facing away from the rotating shaft is connected to the ratchet rotor, the reset button is located on the side of the ratchet rotor away from the push rod, the reset button has a slot facing the push rod opening and arranged at intervals along the circumference of the cavity, and the ratchet rotor has a slot that cooperates with the slot The clamping piece is disengaged from the corresponding slot when the ratchet rotor is reversed relative to the reset button. As a result, the driving motor is blocked at the moment the fastening part is tightened, and the rotating shaft drives the push rod to reverse through the driving motor, and the push rod drives the ratchet rotor to reverse, and the clamping piece is disengaged from the current slot and rotates to the next slot. When the clamping piece transitions to the next slot, there is a movable gap between the clamping piece and the corresponding slot in the axial direction, and the elastic piece can rebound to push the entire rotating shaft to move in the direction close to the reset piece until the movement of the rotating shaft reaches the total amount of the movement gap, and the rotating shaft moves toward the reset piece while driving the screw bit away from the screw, thereby realizing the separation of the screw bit and the screw, avoiding the drive motor from being blocked and causing injury to the operator or the electric screwdriver to fly out, thereby improving the safety of the operation.

[0006] The electric screwdriver of the embodiment of the present invention comprises: a shell, the shell has a cavity extending along the length direction thereof, and the two ends of the cavity have a first opening and a second opening opposite to each other; a driving assembly, the driving assembly comprises a driving motor, a rotating shaft and a push rod, the rotating shaft is movably arranged in the shell and one end of which extends out of the first opening and is connected to the bit, the driving motor is located on the side of the rotating shaft facing the second opening and its output shaft is connected to the rotating shaft, the push rod is movably arranged in the cavity and connected to the side of the driving motor away from the rotating shaft, the rotating shaft is provided with a limiting protrusion, and the limiting protrusion and the An elastic member is provided between the inner walls of the cavity, and the elastic member can be compressed by the movement of the rotating shaft in the direction away from the push rod; a reset member, the reset member is provided at the second opening, and the reset member includes a reset button and a ratchet rotor, the end of the push rod facing away from the rotating shaft is connected to the ratchet rotor, the reset button is located on the side of the ratchet rotor away from the push rod, the reset button has a slot facing the push rod opening and arranged at intervals along the circumference of the cavity, the ratchet rotor has a clamping member cooperating with the slot, and when the ratchet rotor is reversed relative to the reset button, the clamping member disengages from the corresponding slot.

[0007] The electric screwdriver of the embodiment of the present invention has a shell with a cavity extending along its length direction, and a first opening and a second opening are respectively provided at both ends of the cavity, a driving motor is mounted on the push rod and its output shaft is connected to the rotating shaft, the other end of the rotating shaft extends out of the first opening and is connected to the bit, a limiting protrusion is provided on the rotating shaft, and an elastic member is provided between the limiting protrusion and the inner wall of the cavity, the rotating shaft moves in a direction away from the push rod to compress the elastic member, the reset member is provided at the second opening and includes a ratchet rotor connected to the push rod and a reset button located on a side of the ratchet rotor away from the push rod, the reset button has a clamping groove facing the push rod opening and arranged at intervals along the circumference of the cavity, the ratchet rotor has a clamping member matching the clamping groove, and when the ratchet rotor is reversed relative to the reset button, the clamping member The holder disengages from the corresponding slot. As a result, at the moment of nailing completion, the overload of the screwdriver bit will cause the high-speed rotation of the rotating shaft to stop instantly. The driving motor will drive the push rod to reverse and compress the elastic part at the moment of stalling. The push rod further drives the ratchet to rotate in reverse to achieve the disengagement of the holder from the slot. When the holder transitions to the next slot, there is a movable gap between the holder and the corresponding slot in the axial direction. The elastic part can rebound to push the entire rotating shaft to move in the direction close to the reset part until the movement of the rotating shaft reaches the total amount of the movement gap. When the rotating shaft moves toward the reset part, it will drive the screwdriver bit away from the screw, thereby realizing the separation of the screwdriver bit and the screw, avoiding the drive motor stalling and causing injury to the operator or the electric screwdriver flying out, thereby improving operation safety.

[0008] In some embodiments, the slot includes a first side wall and a second side wall that are opposite to each other in the circumferential direction of the ratchet rotor, and the first side wall and the second side wall both extend outwardly in a direction away from the bottom wall of the slot, and when the retaining member is engaged in the slot, the side surface of the retaining member opposite to the first side wall is a forward rotation contact surface, and the forward rotation contact surface is a straight surface, and the side surface of the retaining member opposite to the second side wall is a reverse rotation contact surface, and the reverse rotation contact surface is an inclined surface matching the second side wall.

[0009] In some embodiments, the ratchet rotor has a first mating hole open toward the rotating shaft, and the end of the push rod away from the rotating shaft is mated in the first mating hole. One of the inner circumference of the first mating hole and the outer circumference of the rotating shaft is provided with a limiting groove extending along the length direction of the shell, and the other is provided with a limiting block, and the limiting block is slidably fitted in the limiting groove.

[0010] In some embodiments, the reset button includes a cylinder and a pressing column, the pressing column is inserted into the second opening, the cylinder is connected to one end of the pressing column facing the ratchet rotor, and the cylinder has a second matching hole open toward the ratchet rotor, and a portion of the ratchet rotor extends into the second matching hole.

[0011] In some embodiments, the end surface of the cylinder facing the ratchet rotor is provided with a plurality of the slots spaced apart along its circumference, and the outer circumferential surface of the ratchet rotor is provided with at least one clamping member protruding toward the slot.

[0012] In some embodiments, the outer circumferential surface of the cylinder is provided with a plurality of protrusions spaced apart along its circumference, and the protrusions abut against the inner circumferential surface of the cavity.

[0013] In some embodiments, the cross-sectional area of ​​the cylinder is larger than the opening size of the second opening, and the end surface of the cylinder facing the second opening abuts against the end wall where the second opening is located;

[0014] And / or, the ratchet rotor includes a boss that fits in the cylinder, a limit piece is provided on the outer circumferential surface of the boss, and a stop piece is provided on the inner wall of the cylinder, and the stop piece can stop against the limit piece to prevent the boss from detaching from the cylinder.

[0015] In some embodiments, the elastic member is a cylindrical spring, and the cylindrical spring is sleeved on the rotating shaft.

[0016] In some embodiments, the electric screwdriver further includes a support bearing for supporting the rotating shaft, wherein the support bearing is disposed in the cavity and located on the side of the limiting protrusion facing the first opening, and the elastic member is located between the support shaft and the limiting protrusion.

[0017] The screw driving device according to the embodiment of the present invention comprises the electric screwdriver according to the above embodiment.

[0018] The screw driving device of the embodiment of the present invention adopts the above-mentioned electric screwdriver, the shell has a cavity extending along its length direction, and the two ends of the cavity are respectively provided with a first opening and a second opening, the driving motor is installed on the push rod and its output shaft is connected to the rotating shaft, the other end of the rotating shaft extends out of the first opening and is connected to the screw bit, a limiting protrusion is provided on the rotating shaft, and an elastic member is provided between the limiting protrusion and the inner wall of the cavity, the rotating shaft moves in a direction away from the push rod to compress the elastic member, the reset member is provided at the second opening and includes a ratchet rotor connected to the push rod and a reset button located on the side of the ratchet rotor away from the push rod, the reset button has a clamping groove facing the push rod opening and arranged at intervals along the circumference of the cavity, the ratchet rotor has a clamping member matching the clamping groove, and the ratchet rotor is relative to the reset button. When the button is reversed, the holding part disengages from the corresponding slot. As a result, at the moment of nailing completion, the overload of the screwdriver bit will cause the high-speed rotation of the rotating shaft to stop instantly. The driving motor will drive the push rod to reverse and compress the elastic part at the moment of stalling. The push rod further drives the ratchet to rotate in reverse to achieve the disengagement of the holding part from the slot. When the holding part transitions to the next slot, there is a movable gap between the holding part and the corresponding slot in the axial direction. The elastic part can rebound to push the entire rotating shaft to move in the direction close to the reset part until the movement of the rotating shaft reaches the total amount of the movement gap. When the rotating shaft moves toward the reset part, it will drive the screwdriver bit away from the screw, thereby realizing the separation of the screwdriver bit and the screw, avoiding the drive motor stalling and causing injury to the operator or the electric screwdriver flying out, thereby improving operation safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of an electric screwdriver according to an embodiment of the present invention;

[0020] Figure 2 is a schematic structural diagram of a drive assembly of an electric screwdriver according to an embodiment of the present invention;

[0021] Figure 3 2 is a cross-sectional view of an electric screwdriver according to an embodiment of the present invention.

[0022] Figure 4 It is a schematic structural diagram of a ratchet wheel of a driving assembly of an electric screwdriver according to an embodiment of the present invention.

[0023] Reference numerals:

[0024] Shell 1, rotating shaft 2, limiting protrusion 21, reset member 3, reset button 31, convex block 311, pressing column 312, cylinder 313, slot 314, stopper 315, ratchet rotor 32, convex column 321, tube column 322, clamping member 323, limiting member 324, elastic member 4, bearing 5, screwdriver bit 6, screwdriver bit connector 7, top ball spring 71, drive motor 8, push rod 9. DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0026] like Figure 1-Figure 4 As shown, the electric screwdriver according to the embodiment of the present invention comprises a housing 1 , a driving assembly and a reset member 3 .

[0027] Specifically, the shell 1 has a cavity extending along its length, and the two ends of the cavity have a first opening and a second opening opposite to each other. The driving assembly includes a driving motor 8, a rotating shaft 2 and a push rod 9. The rotating shaft 2 is movably arranged in the shell 1 and one end thereof extends out of the first opening and is connected to the screwdriver bit 6. The driving motor 8 is located on the side of the rotating shaft 2 facing the second opening and its output shaft is connected to the rotating shaft 2. The push rod 9 is movably arranged in the cavity and connected to the side of the driving motor 8 away from the rotating shaft 2. A limiting protrusion 21 is provided on the rotating shaft, and an elastic member 4 is provided between the limiting protrusion 21 and the inner wall of the cavity. The rotating shaft 2 moves the compressible elastic member 4 in the direction away from the push rod 9, the reset member 3 is arranged at the second opening, and the reset member 3 includes a reset button 31 and a ratchet rotor 32. The end of the push rod 9 away from the rotating shaft 2 is connected to the ratchet rotor 32, and the reset button 31 is located on the side of the ratchet rotor 32 away from the push rod 9. The reset button 31 has a slot 314 that opens toward the push rod 9 and is arranged at intervals along the circumference of the cavity. The ratchet rotor 32 has a holding member 323 that cooperates with the slot 314, and when the ratchet rotor 32 is reversed relative to the reset button 31, the holding member 323 disengages from the corresponding slot 314.

[0028] When the screwdriver is in the working state, the driving motor 8 drives the rotating shaft 2 to rotate in the forward direction. At the moment of nailing, the overload of the screwdriver bit 6 will cause the rotating shaft 2 to stop rotating at a high speed. At the moment of stalling of the driving motor 8, the pushing rod 9 will be driven to reverse and compress the elastic member 4 at the same time. The pushing rod 9 further drives the ratchet rotor 32 to reverse and realize the disengagement of the clamping member 323 from the clamping slot 314. When the clamping member 323 transitions to the next clamping slot 314, there is a movable gap between the clamping member 323 and the corresponding clamping slot 314 in the axial direction. The elastic member 4 can rebound to push the entire rotating shaft 2 to move in the direction close to the reset member 3 until the movement of the rotating shaft 2 reaches the total amount of the movement gap. The clamping member 323 and the clamping slot 314 cooperate again, and when the rotating shaft 2 moves toward the reset member 3, the screwdriver bit 6 will be driven away from the screw, thereby realizing the separation of the screwdriver bit 6 from the screw, avoiding the jam of the driving motor 8 causing injury to the operator or the electric screwdriver flying out, thereby improving the safety of the operation.

[0029] In the electric screwdriver of the embodiment of the present invention, the shell 1 has a cavity extending along its length direction, and the two ends of the cavity are respectively provided with a first opening and a second opening, the driving motor 8 is installed on the push rod 9 and its output shaft is connected to the rotating shaft 2, the other end of the rotating shaft 2 extends out of the first opening and is connected to the bit 6, a limiting protrusion 21 is provided on the rotating shaft, and an elastic member 4 is provided between the limiting protrusion 21 and the inner wall of the cavity, the rotating shaft 2 moves in a direction away from the push rod 9 to compress the elastic member 4, the reset member 3 is provided at the second opening and includes a ratchet rotor 32 connected to the push rod 9 and a reset button 31 located on the side of the ratchet rotor 32 away from the push rod 9, the reset button 31 has a card slot 314 which opens toward the push rod 9 and is arranged at intervals along the circumference of the cavity, the ratchet rotor has a clamping member 323 which cooperates with the card slot 314, and when the ratchet rotor 32 is reversed relative to the reset button 31, the clamping member 323 is engaged with the card slot 314, and when the ratchet rotor 32 is reversed relative to the reset button 31, the clamping member 323 is engaged with the card slot 314. The holding piece 323 disengages from the corresponding slot 314. Therefore, at the moment of nailing, the overload of the screwdriver bit 6 will cause the high-speed rotation of the rotating shaft 2 to stop instantly. The driving motor 8 will drive the push rod 9 to reverse and compress the elastic member 4 at the moment of stalling. The push rod 9 further drives the ratchet rotor 32 to reverse and realize the disengagement of the holding piece 323 from the slot 314. When the holding piece 323 transitions to the next slot, there is a movable gap between the holding piece 323 and the corresponding slot 314 in the axial direction. The elastic member 4 can rebound to push the entire rotating shaft 2 to move in the direction close to the reset member 3 until the movement of the rotating shaft 2 reaches the total amount of the movement gap. When the rotating shaft 2 moves toward the reset member 3, it will drive the screwdriver bit 6 away from the screw, thereby realizing the separation of the screwdriver bit 6 and the screw, avoiding the drive motor 8 from stalling and causing injury to the operator or the electric screwdriver to fly out, thereby improving the safety of the operation.

[0030] It can be understood that the reverse rotation of the ratchet rotor 32 will not cause it to disengage from the reset button 31, only the tooth jumping phenomenon will occur. After the rotating shaft 2 is disengaged from the screw, the driving motor 8 drives the rotating shaft 2 to rotate forward, and the ratchet rotor 32 and the reset button 31 can be locked again. Therefore, compared with the ordinary connection and matching method, the ratchet engagement can achieve automatic locking after the driving motor 8 rotates forward, without manual operation, which is simple and convenient.

[0031] Specifically, the slot 314 includes a first side wall and a second side wall that are opposite to each other in the circumferential direction of the ratchet rotor 32. Both the first side wall and the second side wall extend outwardly in a direction away from the bottom wall of the slot 314. When the clamp 323 is engaged in the slot 314, the side of the clamp 323 opposite to the first side wall is a forward contact surface, and the forward contact surface is a straight surface. The side of the clamp 323 opposite to the second side wall is a reverse contact surface, and the reverse contact surface is an inclined surface that matches the second side wall. Therefore, at the moment of overload, when the push rod 9 drives the ratchet rotor 32 to reverse, the reverse contact surface contacts the second side wall. Since the two are matching inclined surfaces, sliding out of the slot can be achieved. The forward contact surface can contact the first side wall during the normal screwing and tightening of the parts by the electric screwdriver, so as to use the stop of the two to fix the push rod 9 to stabilize the drive motor 8. Since the forward contact surface is a straight surface, there is no risk of sliding out of the slot between the push rod 9 and the first side wall.

[0032] Preferably, the elastic member 4 is a cylindrical spring, which is sleeved on the rotating shaft 2. Thus, the rotating shaft 2 can limit the expansion and contraction of the elastic member 4, ensuring that the elastic member 4 can push the rotating shaft 2 to move along the axial direction of the rotating shaft 2, thereby avoiding the problem of deviation of the rotating shaft 2 during movement.

[0033] Preferably, the limiting protrusion 21 is an annular protrusion, so that the limiting protrusion 21 can be used to stop the entire end of the cylindrical spring to ensure the limiting reliability.

[0034] Furthermore, if Figure 2 and Figure 3 As shown, the ratchet rotator 32 has a first matching hole open toward the rotating shaft 2, and one end of the push rod 9 away from the rotating shaft 2 is matched in the first matching hole. A limiting groove extending along the length direction of the housing 1 is provided on one of the inner circumference of the first matching hole and the outer circumference of the rotating shaft 2, and a limiting block is provided on the other, and the limiting block is slidably matched in the limiting groove. Therefore, the matching of the limiting block and the limiting groove can prevent the relative rotation between the ratchet rotator 32 and the push rod 9, and the insertion of the end of the push rod 9 into the first matching hole can improve the matching stability and compactness of the push rod 9 and the ratchet rotator 32.

[0035] Furthermore, if Figure 2 and Figure 3As shown, the reset button 31 includes a cylinder 313 and a pressing column 312, the pressing column 312 is inserted into the second opening, the cylinder 313 is connected to one end of the pressing column 312 facing the ratchet rotator 32, and the cylinder 313 has a second matching hole open toward the ratchet rotator 32, and a part of the ratchet rotator 32 extends into the second matching hole. In other words, the reset button 31, the ratchet rotator 32 and the rotating shaft 2 are sleeved in sequence, with a compact structure and stable assembly.

[0036] Preferably, the end surface of the cylinder 313 facing the ratchet rotor 32 is provided with a plurality of slots 314 spaced apart along its circumference, and the outer circumferential surface of the ratchet rotor 32 is provided with at least one retaining member 323 protruding toward the slot 314 .

[0037] Specifically, the ratchet rotor 32 includes a protrusion 321 that fits in the second matching hole and a tube column 322 located on the side of the reset button 31 facing the rotating shaft 2. The tube column 322 is provided with a first matching hole upward, and the tube column 322 is provided with a clamping member 323 that is arranged at intervals along its circumference and extends along the length direction of the rotating shaft 2. The cylinder 313 is provided with a clamping groove 314 that is arranged at intervals along the circumference of the cylinder 313 at the end facing the tube column 322.

[0038] Furthermore, if Figure 3 As shown, a stopper 324 is provided on the outer circumference of the boss 321, and a stopper 315 is provided on the inner wall of the cylinder 313. The stopper 315 can stop against the stopper 324 to prevent the boss 321 from being separated from the cylinder 313. Figure 3 and Figure 4 As shown, the limiting member 324 is a convex ring formed on the top of the convex column 321 , and an annular stopper 315 is provided on the inner wall of the open end of the cylinder 313 .

[0039] Preferably, the cross-sectional area of ​​the cylinder 313 is larger than the opening size of the second opening, and the end surface of the cylinder 313 facing the second opening abuts against the end wall where the second opening is located. Thus, the cylinder 313 can serve as a limiting structure to prevent the reset button 31 from falling out of the second opening.

[0040] Optionally, a plurality of convex blocks 311 are arranged at intervals along the circumference of the cylinder 313, and the convex blocks 311 abut against the inner circumference of the cavity. Thus, the convex blocks 311 can support the reset button 31 and prevent the reset button 31 from shaking.

[0041] Furthermore, if Figure 2 and Figure 3 As shown, the electric screwdriver further includes a support bearing 5 for supporting the rotating shaft 2, the support bearing 5 is arranged in the cavity and located on the side of the limiting protrusion 311 facing the first opening, and the elastic member 4 is located between the support shaft 2 and the limiting protrusion 311. It can be understood that the support shaft can be used to ensure the stability of the rotating shaft 2.

[0042] Furthermore, if Figure 2 and Figure 3 As shown, the screwdriver bit 6 is connected to the rotating shaft 2 via a screwdriver bit connector 7 , and a ball spring 71 surrounding the outer circumference of the screwdriver bit 6 is provided on the screwdriver bit connector 7 to ensure that the screwdriver bit 6 rotates smoothly.

[0043] The screw driving device according to the embodiment of the present invention comprises the electric screwdriver according to the above embodiment.

[0044] The screw driving device of the embodiment of the present invention adopts the above-mentioned electric screwdriver, the housing 1 of the electric screwdriver has a cavity extending along its length direction, and the two ends of the cavity are respectively provided with a first opening and a second opening, the driving motor 8 is installed on the push rod 9 and its output shaft is connected to the rotating shaft 2, the other end of the rotating shaft 2 extends out of the first opening and is connected to the screwdriver bit 6, a limiting protrusion 21 is provided on the rotating shaft, and an elastic member 4 is provided between the limiting protrusion 21 and the inner wall of the cavity, the rotating shaft 2 moves the compressible elastic member 4 in the direction away from the push rod 9, the reset member 3 is provided at the second opening and includes a ratchet rotor 32 connected to the push rod 9 and a reset button 31 located on the side of the ratchet rotor 32 away from the push rod 9, the reset button 31 has a card slot 314 opening toward the push rod 9 and arranged at intervals along the circumference of the cavity, the ratchet rotor has a clamping member 323 matching the card slot 314, and the ratchet rotor 32 is relatively When the reset button 31 is reversed, the holding piece 323 disengages from the corresponding slot 314. As a result, at the moment of nailing completion, the overload of the screwdriver bit 6 will cause the rotating shaft 2 to stop rotating at high speed instantly. The driving motor 8 will drive the push rod 9 to reverse and compress the elastic piece 4 at the moment of stalling. The push rod 9 further drives the ratchet rotor 32 to reverse and realize the disengagement of the pawl 323 from the ratchet 314. When the pawl 323 transitions to the next ratchet groove, there is a movable gap between the pawl 323 and the corresponding ratchet groove in the axial direction. The elastic piece 4 can rebound to push the entire rotating shaft 2 to move in the direction close to the reset piece 3 until the movement of the rotating shaft 2 reaches the total amount of the movement gap. When the rotating shaft 2 moves toward the reset piece 3, it will drive the screwdriver bit 6 away from the screw, thereby realizing the separation of the screwdriver bit 6 and the screw, avoiding the drive motor 8 from stalling and causing injury to the operator or the electric screwdriver to fly out, thereby improving the safety of the operation.

[0045] Furthermore, the screw driving device also includes a nail feeding assembly, which is used to feed screws for the power screwdriver to operate.

[0046] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0047] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0048] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0050] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0051] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An electric screwdriver, characterized in that: include: A shell, wherein the shell has a cavity extending along its length direction, and two ends of the cavity have a first opening and a second opening opposite to each other; A driving assembly, the driving assembly comprising a driving motor, a rotating shaft and a push rod, the rotating shaft is movably arranged in the housing and one end of which extends out of the first opening and is connected to the bit, the driving motor is located on the side of the rotating shaft facing the second opening and its output shaft is connected to the rotating shaft, the push rod is movably arranged in the cavity and connected to the side of the driving motor away from the rotating shaft, a limiting protrusion is provided on the rotating shaft, and an elastic member is provided between the limiting protrusion and the inner wall of the cavity, and the elastic member can be compressed by the rotating shaft moving in a direction away from the push rod; A reset member, which is arranged at the second opening, and includes a reset button and a ratchet rotor, the end of the push rod facing away from the rotating shaft is connected to the ratchet rotor, the reset button is located on the side of the ratchet rotor away from the push rod, the reset button has a slot facing the push rod opening and arranged at intervals along the circumference of the cavity, the ratchet rotor has a clamping member that cooperates with the slot, and when the ratchet rotor is reversed relative to the reset button, the clamping member disengages from the corresponding slot.

2. The electric screwdriver according to claim 1, characterized in that: The slot includes a first side wall and a second side wall that are opposite to each other in the circumferential direction of the ratchet rotor, and the first side wall and the second side wall both extend outwardly and obliquely in a direction away from the bottom wall of the slot. When the retaining member is engaged in the slot, the side surface of the retaining member opposite to the first side wall is a forward rotation contact surface, and the forward rotation contact surface is a straight surface, and the side surface of the retaining member opposite to the second side wall is a reverse rotation contact surface, and the reverse rotation contact surface is an inclined surface matching the second side wall.

3. The electric screwdriver according to claim 1, characterized in that: The ratchet rotor has a first mating hole open toward the rotating shaft, and one end of the push rod away from the rotating shaft is mated in the first mating hole, and one of the inner circumference of the first mating hole and the outer circumference of the rotating shaft is provided with a limiting groove extending along the length direction of the shell, and the other is provided with a limiting block, and the limiting block is slidably fitted in the limiting groove.

4. The electric screwdriver according to claim 3, characterized in that: The reset button includes a cylinder and a pressing column, the pressing column is inserted into the second opening, the cylinder is connected to one end of the pressing column facing the ratchet rotor, and the cylinder has a second matching hole open toward the ratchet rotor, and a portion of the ratchet rotor extends into the second matching hole.

5. The electric screwdriver according to claim 4, characterized in that: The end surface of the cylinder body facing the ratchet rotor is provided with a plurality of the clamping grooves spaced apart along its circumference, and the outer circumferential surface of the ratchet rotor is provided with at least one clamping member protruding toward the clamping groove.

6. The electric screwdriver according to claim 4, characterized in that: The outer circumferential surface of the cylinder is provided with a plurality of protrusions which are arranged at intervals along the circumferential direction thereof, and the protrusions abut against the inner circumferential surface of the cavity.

7. The electric screwdriver according to claim 4, characterized in that: The cross-sectional area of ​​the cylinder is larger than the opening size of the second opening, and the end surface of the cylinder facing the second opening abuts against the end wall where the second opening is located; And / or, the ratchet rotor includes a boss that fits in the cylinder, a limit piece is provided on the outer circumferential surface of the boss, and a stop piece is provided on the inner wall of the cylinder, and the stop piece can stop against the limit piece to prevent the boss from detaching from the cylinder.

8. The electric screwdriver according to claim 1, characterized in that: The elastic member is a cylindrical spring, and the cylindrical spring is sleeved on the rotating shaft.

9. The electric screwdriver according to claim 8, characterized in that: It also includes a support bearing for supporting the rotating shaft, wherein the support bearing is arranged in the cavity and located on the side of the limiting protrusion facing the first opening, and the elastic member is located between the support shaft and the limiting protrusion.

10. A screw driving device, characterized in that: The invention comprises an electric screwdriver according to any one of claims 1 to 9.

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