Screwdriver head and electric screwdriver

Abstract

The utility model provides a screwdriver head and an electric screwdriver, and relates to the technical field of screwdrivers, the screwdriver head comprises a driving shaft, an adjustable transmission assembly, a locking assembly and an output tool bit, the adjustable transmission assembly is used for adjusting the output angle of the output tool bit, the locking assembly comprises a tool bit fixing frame and a locking wheel, and the locking wheel is used for fixing the output angle of the output tool bit. According to the screwdriver blade provided by the invention, the locking assembly is arranged at the output tool bit, and the output tool bit can be locked through the locking assembly after being adjusted to a proper angle, so that the stability of the output tool bit during operation is ensured. According to the electric screw driver provided by the invention, the screw driver blade is adopted, the output tool bit can be locked through the locking assembly after the output tool bit is adjusted, the stability during screw rotation operation is guaranteed, and the safety and the operation efficiency during use are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of screwdrivers, in particular to a screwdriver bit and an electric screwdriver. Background Art

[0002] Electric screwdrivers mainly have two types: straight handles and pistol grips. Their use in different working conditions has its own advantages and disadvantages. The straight handle is suitable for working conditions where downward rotation is required, and the pistol grip is suitable for working conditions on planes and upward rotation. In some complex working conditions, the two need to be used in combination and switched, which requires two screwdrivers, making it very inconvenient to use. There are also external adapters on the market that can achieve the conversion of the output shaft angle to adapt to different working conditions, but external parts are still required, resulting in high costs and inconvenient portability.

[0003] Currently, some screwdriver bits with adjustable blade angles have emerged on the market, such as using a traditional screwdriver plus a flexible universal shaft or a segmented universal joint to achieve angle adjustment. However, the existing adjustable-angle screwdrivers lack a locking device, making it difficult to control the output blade angle during use, prone to shaking, and even deviating from or falling off the screw, affecting the use effect. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a screwdriver bit and an electric screwdriver to solve the above technical problems.

[0005] In a first aspect, an embodiment of the utility model provides a screwdriver bit, which includes: a drive shaft, an adjustable transmission component, a locking component, and an output blade. One end of the drive shaft is drivingly connected to the output blade through the adjustable transmission component. The adjustable transmission component is used to adjust the included angle between the drive shaft and the output blade. The locking component includes a blade fixing frame and a locking wheel. The blade fixing frame is connected to the output blade and rotates synchronously with the output blade. The locking wheel is connected to the adjustable transmission component and has a locking position where it abuts against the blade fixing frame to limit the rotation of the blade fixing frame and an unlocking position where it disengages from the blade fixing frame. The locking wheel is driven to switch between the locking position and the unlocking position.

[0006] Further, a plurality of locking slots are circumferentially spaced apart on the blade fixing frame, and a locking protrusion is provided on the locking wheel. The locking protrusion can be inserted into any one of the locking slots. When the locking wheel switches to the locking position, the locking protrusion is inserted into the corresponding locking slot.

[0007] Further, the screwdriver bit further includes a protective housing. The drive shaft, the adjustable transmission component, the locking component, and the output blade are all arranged inside the protective housing. An adjustment opening is provided on the protective housing, and the output end of the output blade extends outside the protective housing through the adjustment opening.

[0008] Further, the adjustable transmission assembly includes a first gear, a second gear, a third gear, and an intermediate shaft. The intermediate shaft is disposed in the protective housing and is perpendicular to the drive shaft and the output tool bit. The first gear is disposed on the drive shaft, the second gear is disposed on the intermediate shaft, and the third gear is disposed on the output tool bit. The first gear, the second gear, and the third gear are meshed in sequence, and the third gear can rotate circumferentially around the intermediate shaft, so that the included angle between the output tool bit and the drive shaft is adjustable.

[0009] Further, the locking assembly further includes a return spring and a drive button. The locking wheel is slidably disposed on the intermediate shaft, and the return spring and the drive button are respectively disposed on both sides of the locking wheel.

[0010] Further, a dust-proof assembly is disposed inside the protective housing. The dust-proof assembly is disposed between the protective housing and the tool bit fixing bracket and is used to block the adjustment opening.

[0011] Further, the dust-proof assembly includes a dust-proof baffle. The dust-proof baffle is slidably disposed between the protective housing and the tool bit fixing bracket. A limiting protrusion is disposed on the outer side wall of the tool bit fixing bracket. The limiting protrusion can abut against the dust-proof baffle. When adjusting the angle of the output tool bit, the limiting protrusion can push the dust-proof baffle to slide along the adjustment opening.

[0012] Further, the protective housing includes a first housing and a second housing which are symmetrically arranged. Fixing screw holes are formed in the first housing and the second housing, and a stud can be passed through the fixing screw holes. The first housing and the second housing are detachably connected through the stud.

[0013] On the other hand, an embodiment of the present invention further provides an electric screwdriver, which includes the tool bit according to any one of the above, a drive motor, and a gearbox. The output shaft of the drive motor is connected to the drive shaft of the tool bit through the gearbox.

[0014] Further, the electric screwdriver further includes a storage battery, and the storage battery is electrically connected to the drive motor.

[0015] For the tool bit provided by the present invention, by providing a locking assembly at the output tool bit, the output tool bit can be locked by the locking assembly after being adjusted to a suitable angle, ensuring the stability of the output tool bit during operation. Since the locking assembly directly acts on the output tool bit, the locking effect is good, and the volume is small, which will not excessively increase the volume of the tool bit, ensuring the portability of the tool bit and making the operation more convenient during use. Description of the Drawings

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 An exploded view of the screwdriver bit provided by an embodiment of the present invention;

[0018] Figure 2 A perspective view of the screwdriver bit provided by an embodiment of the present invention;

[0019] Figure 3 One of the usage state diagrams of the locking assembly in the screwdriver bit provided by an embodiment of the present invention;

[0020] Figure 4 Another usage state diagram of the locking assembly in the screwdriver bit provided by an embodiment of the present invention;

[0021] Figure 5 A schematic diagram of the cooperation between the bit fixing bracket and the dust-proof baffle in the screwdriver bit provided by an embodiment of the present invention;

[0022] Figure 6 An exploded view of the electric screwdriver provided by an embodiment of the present invention.

[0023] Reference numerals: 100 - drive shaft; 200 - adjustable transmission assembly; 300 - locking assembly; 400 - output bit; 301 - bit fixing bracket; 302 - locking wheel; 3011 - locking slot; 3021 - locking protrusion; 500 - protective housing; 501 - adjustment opening; 201 - first gear; 202 - second gear; 203 - third gear; 204 - intermediate shaft; 303 - return spring; 304 - drive button; 601 - dust-proof baffle; 3012 - limiting protrusion; 502 - first housing; 503 - second housing; 504 - fixing screw hole; 700 - stud; 800 - drive motor; 900 - gearbox; 1000 - storage battery. Specific Embodiments

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention claimed, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0026] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and defined, the terms "arrangement", "installation", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] The following will, with reference to the accompanying drawings, elaborate on some embodiments of the present invention. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0028] Embodiment 1

[0029] This embodiment provides a screwdriver bit, which includes: a drive shaft 100, an adjustable transmission assembly 200, a locking assembly 300, and an output bit 400. One end of the drive shaft 100 is connected to the rotating shaft of a drive motor 800, and the other end is drivingly connected to the output bit 400 through the adjustable transmission assembly 200. The adjustable transmission assembly 200 is used to adjust the output angle of the output bit 400. The locking assembly 300 includes a bit fixing bracket 301 and a locking wheel 302. The bit fixing bracket 301 is connected to the output bit 400 and rotates synchronously with the output bit 400. The locking wheel 302 is arranged to be connected to the adjustable transmission assembly 200, and the locking wheel 302 has a locking position where it abuts against the bit fixing bracket 301 to limit the rotation of the bit fixing bracket 301 and an unlocking position where it disengages from the bit fixing bracket 301. The locking wheel 302 is driven to switch between the locking position and the unlocking position.

[0030] Please refer to Figure 1 and Figure 2 As shown, in this embodiment, one end of the drive shaft 100 is used to connect to the rotating shaft of an external drive motor 800 or to connect to other drive tools. The other end of the drive shaft 100 is drivingly connected to the output bit 400 through the adjustable transmission assembly 200. The adjustable transmission assembly 200 is used to adjust the included angle between the output bit 400 and the output shaft, thereby adjusting the output angle of the output bit 400 to adapt to the usage requirements in different environments. A locking assembly 300 is provided at the adjustable transmission assembly 200. The locking assembly 300 includes a bit fixing bracket 301 and a locking wheel 302. Please refer toFigure 1 As shown, the tool head fixing bracket 301 is set as a hollow sleeve structure, and the tool head fixing bracket 301 is sleeved outside the adjustable transmission assembly 200. A fixing hole for fixing the output tool head 400 is provided on the tool head fixing bracket 301, and the output tool head 400 passes through the fixing hole, so that the output tool head 400 and the tool head fixing bracket 301 rotate synchronously. On the one hand, the tool head fixing bracket 301 can play a role in fixing the output tool head 400, ensuring the stability of the output tool head 400 during angle adjustment and the working process. On the other hand, the tool head fixing bracket 301 rotates synchronously with the output tool head 400, and cooperates with the locking wheel 302 to lock the output tool head 400, so that the output tool head 400 maintains the working angle and avoids the output tool head 400 from shaking or detaching from the workpiece. Specifically, the locking wheel 302 is movably connected to the adjustable transmission assembly 200. The locking wheel 302 has a locking position where it abuts against the tool head fixing bracket 301 to limit the rotation of the tool head fixing bracket 301 and an unlocking position where it disengages from the tool head fixing bracket 301. The locking wheel 302 is driven to switch between the locking position and the unlocking position. When the operator adjusts the output tool head 400 to a suitable angle, driving the locking wheel 302 to abut against the tool head fixing bracket 301 can lock the tool head fixing bracket 301, ensuring that the output tool head 400 maintains the output angle and avoiding the output tool head 400 from shaking during the output process. The locking wheel 302 is directly arranged at the adjustable transmission assembly 200, and the output tool head 400 is locked by directly restricting the rotation of the tool head bracket, and the locking effect is good. At the same time, arranging the locking wheel 302 at the tool head fixing bracket 301 can make full use of the space, will not overly increase the volume of the screwdriver head, and ensure the portability of the screwdriver head.

[0031] Optionally, in some embodiments of this embodiment, a plurality of locking slots 3011 are circumferentially spaced on the tool head fixing bracket 301. A locking protrusion 3021 is provided on the locking wheel 302, and the locking protrusion 3021 can be engaged in any one of the locking slots 3011. When the locking wheel 302 switches to the locking position, the locking protrusion 3021 is engaged in the locking slot 3011 at the corresponding position.

[0032] Please refer to Figure 1 、 Figure 3 and Figure 4 As shown in and, in this embodiment, a plurality of locking slots 3011 are opened on the tool head fixing bracket 301. The locking slots 3011 are circumferentially spaced along the tool head fixing bracket 301. The number and interval angle of the locking slots 3011 can be adjusted adaptively according to the adjustment angle of the output tool head 400, and this embodiment does not make any restrictions. Correspondingly, a locking protrusion 3021 is correspondingly provided on the locking wheel 302, and the locking protrusion 3021 can be engaged in any one of the locking slots 3011, thereby locking the tool head fixing bracket 301. The number of the locking protrusions 3021 can be one or more. Please refer to Figure 3As shown, when multiple locking protrusions 3021 are provided, the interval angle of the locking protrusions 3021 corresponds to the interval angle of the locking slots 3011. Please refer to Figure 3 and Figure 4 shown, Figure 3 and Figure 4 and Figure 4 are the usage state diagrams of the locking assembly 300. When the output tool bit 400 needs to be adjusted, the output tool bit 400 is adjusted to the required angle, and the adjusted angle needs to correspond to the opening angle of the locking slot 3011 to ensure that the locking protrusion 3021 can be inserted into the corresponding locking slot 3011 to form a locking effect.

[0033] Optionally, in some embodiments of this embodiment, the screwdriver bit further includes a protective housing 500. The drive shaft 100, the adjustable transmission assembly 200, the locking assembly 300, and the output tool bit 400 are all disposed inside the protective housing 500. An adjustment opening 501 is provided on the protective housing 500, and the output end of the output tool bit 400 extends outside the protective housing 500 through the adjustment opening 501.

[0034] Please refer to Figure 1 and Figure 2 shown. In this embodiment, the protective housing 500 encapsulates the drive shaft 100, the adjustable transmission assembly 200, the locking assembly 300, and the output tool bit 400. On the one hand, it can protect the drive shaft 100, the adjustable transmission assembly 200, the locking assembly 300, and the output tool bit 400. On the other hand, it can maintain the stability of the drive shaft 100, the adjustable transmission assembly 200, the locking assembly 300, and the output tool bit 400, and avoid the drive shaft 100, the adjustable transmission assembly 200, the locking assembly 300, and the output tool bit 400 from falling off.

[0035] Optionally, in some embodiments of this embodiment, the adjustable transmission assembly 200 includes a first gear 201, a second gear 202, a third gear 203, and an intermediate shaft 204. The intermediate shaft 204 is disposed in the protective housing 500 and is perpendicular to the drive shaft 100 and the output tool bit 400. The first gear 201 is disposed on the drive shaft 100, the second gear 202 is disposed on the intermediate shaft 204, the third gear 203 is disposed on the output tool bit 400, the first gear 201, the second gear 202, and the third gear 203 are sequentially meshed, and the third gear 203 can rotate circumferentially around the intermediate shaft 204, so that the included angle between the output tool bit 400 and the drive shaft 100 is adjustable.

[0036] Please refer to Figure 1As shown, in this embodiment, the first gear 201, the second gear 202, and the third gear 203 are all bevel gear structures. The three gears are meshed in sequence to form a gear transmission mechanism. The first gear 201 is connected to the drive shaft 100 and can be connected to an external drive device, such as a drive motor 800, etc., through the drive shaft 100. The third gear 203 is connected to the output tool bit 400, and the output tool bit 400 is used to cooperate with an external nut. The drive shaft 100 rotates under the action of the external drive device, and drives the output tool bit 400 to rotate through the first gear 201, the second gear 202, and the third gear, so as to rotate an external screw. Among them, the intermediate shaft 204 for installing the second gear 202 is perpendicular to the drive shaft 100 and the output tool bit 400, and the third gear 203 can rotate circumferentially around the intermediate shaft 204, so that the included angle between the output tool bit 400 and the drive shaft 100 can be adjusted as needed.

[0037] Optionally, in some embodiments of this embodiment, the locking assembly 300 further includes a return spring 303 and a drive button 304. The locking wheel 302 is slidably disposed on the intermediate shaft 204, and the return spring 303 and the drive button 304 are respectively disposed on both sides of the locking wheel 302.

[0038] Please refer to Figure 1 As shown, in this embodiment, one end of the drive button 304 abuts against the locking wheel 302, and the other end is exposed outside the protective housing 500. An operator can push the locking wheel 302 to switch to the locking position or the unlocking position by pressing the drive button 304. A return spring 303 is disposed on the side of the locking wheel 302 away from the drive button 304, and the return spring 303 provides an elastic force to reset the locking wheel 302 and the drive button 304 to the initial position. In this embodiment, the initial position of the locking wheel 302 can be the locking position or the unlocking position, and no limitation is made here.

[0039] Furthermore, in some embodiments of this embodiment, a dust-proof assembly is disposed inside the protective housing 500. The dust-proof assembly is disposed between the protective housing 500 and the tool bit fixing frame 301 and is used to block the adjustment opening 501.

[0040] Please refer to Figure 2 and Figure 5 As shown, in this embodiment, since the adjustment opening 501 is provided on the protective housing 500, the adjustment can have a certain length to avoid the output tool bit 400. To prevent external foreign objects from entering the inside of the protective housing or affecting the meshing transmission of the gears. Therefore, a dust-proof assembly is disposed between the protective housing 500 and the tool bit fixing frame 301 to block the opening and prevent external foreign objects from entering.

[0041] Optionally, in some embodiments of this embodiment, the dust-proof component includes a dust-proof baffle 601. The dust-proof baffle 601 is slidably disposed between the protective housing 500 and the tool bit fixing bracket 301. A limiting protrusion 3012 is provided on the outer side wall of the tool bit fixing bracket 301. The limiting protrusion 3012 can abut against the dust-proof baffle 601. When adjusting the angle of the output tool bit 400, the limiting protrusion 3012 can push the dust-proof baffle 601 to slide along the adjustment opening 501.

[0042] Please refer to Figure 5 As shown, in this embodiment, the dust-proof plate is an arc-shaped plate and is disposed between the protective housing 500 and the tool bit fixing bracket 301. When adjusting the angle of the output tool bit 400, the protruding portion can push the dust-proof plate to slide along the adjustment opening 501, so as to block the adjustment opening 501 and prevent external foreign objects from entering without affecting the normal angle adjustment of the output tool bit 400.

[0043] Optionally, in some embodiments of this embodiment, the protective housing 500 includes a first housing 502 and a second housing 503 that are symmetrically arranged. Fixing screw holes 504 are formed in the first housing 502 and the second housing 503. A stud 700 can be passed through the fixing screw holes 504. The first housing 502 and the second housing 503 are detachably connected by the stud 700.

[0044] Please refer to Figure 1 As shown, in this embodiment, the protective housing includes a first housing 502 and a second housing 503 that are symmetrically arranged. Separated processing can reduce the production difficulty and also facilitate the installation of components such as the drive shaft 100, the adjustable transmission assembly 200, the locking assembly 300, and the output tool bit 400 into the protective housing. The protective housings are fixed by the stud 700 to ensure the connection strength. In addition to protecting the internal structure, the protective housing can also limit and support the output tool bit 400 and the adjustable transmission assembly 200, playing a reinforcing role, so as to achieve higher torque output.

[0045] Embodiment 2

[0046] The embodiment of the present utility model further provides an electric screwdriver, which includes the tool bit provided in the above embodiment, a drive motor 800, and a gearbox 900. The output shaft of the drive motor 800 is connected to the drive shaft 100 of the tool bit through the gearbox 900.

[0047] Please refer to Figure 6As shown in the figure, in this embodiment, the rotating shaft of the driving motor 800 is connected to the driving shaft 100 of the screwdriver bit through a gearbox 900, and the rotation speed of the output bit 400 can be adjusted through the gearbox 900. Since the above-mentioned screwdriver bit is adopted, after adjusting the output bit 400, the output bit 400 can be locked by the locking assembly 300, ensuring the stability during the screw rotation operation and improving the safety and operation efficiency during use.

[0048] Optionally, in some embodiments of this embodiment, the electric screwdriver further includes a storage battery 1000, and the storage battery 1000 is electrically connected to the driving motor 800. The storage battery 1000 supplies power to the driving motor 800, reducing external connection wires and facilitating carrying.

[0049] In summary, the present invention provides a screwdriver bit, which includes: a driving shaft 100, an adjustable transmission assembly 200, a locking assembly 300, and an output bit 400. One end of the driving shaft 100 is connected to the rotating shaft of the driving motor 800, and the other end is drivingly connected to the output bit 400 through the adjustable transmission assembly 200. The adjustable transmission assembly 200 is used to adjust the output angle of the output bit 400. The locking assembly 300 includes a bit fixing frame 301 and a locking wheel 302. The bit fixing frame 301 is connected to the output bit 400 and rotates synchronously with the output bit 400. The locking wheel 302 is arranged to be connected to the adjustable transmission assembly 200, and the locking wheel 302 has a locking position where it abuts against the bit fixing frame 301 to limit the rotation of the bit fixing frame 301 and an unlocking position where it disengages from the bit fixing frame 301. The locking wheel 302 is driven to switch between the locking position and the unlocking position. By providing the locking assembly 300 at the output bit 400, the output bit 400 can be locked by the locking assembly 300 after being adjusted to a suitable angle, ensuring the stability of the output bit 400 during operation. Since the locking assembly 300 directly acts on the output bit 400, the locking effect is good, and the volume is small, without excessively increasing the volume of the screwdriver bit, ensuring the portability of the screwdriver bit and making the operation more convenient during use.

[0050] The present invention also provides an electric screwdriver, which includes the above-mentioned screwdriver bit, a driving motor 800, and a gearbox 900. The output shaft of the driving motor 800 is connected to the driving shaft 100 of the screwdriver bit through the gearbox 900. Since the above-mentioned screwdriver bit is adopted, after adjusting the output bit 400, the output bit 400 can be locked by the locking assembly 300, ensuring the stability during the screw rotation operation and improving the safety and operation efficiency during use.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A screwdriver head, characterized in that: include: A drive shaft (100), an adjustable transmission assembly (200), a locking assembly (300) and an output cutter head (400), wherein one end of the drive shaft (100) is drivingly connected to the output cutter head (400) via the adjustable transmission assembly (200), the adjustable transmission assembly (200) is used to adjust the angle between the drive shaft and the output cutter head (400), the locking assembly (300) comprises a cutter head fixing frame (301) and a locking wheel (302), the cutter head fixing frame (301) and the output cutter head (400) are connected to the output cutter head (400) and the output cutter head (400) is ... The output cutter head (400) is connected to the cutter head fixing frame (301), and the cutter head fixing frame (301) rotates synchronously with the output cutter head (400), the locking wheel (302) is connected to the adjustable transmission assembly (200), and the locking wheel (302) has a locking position abutting against the cutter head fixing frame (301) to limit the rotation of the cutter head fixing frame (301) and an unlocking position detached from the cutter head fixing frame (301), and the locking wheel (302) is driven to switch between the locking position and the unlocking position.

2. The screwdriver head according to claim 1, characterized in that The cutter head fixing frame (301) is provided with a plurality of locking slots (3011) spaced apart circumferentially, and the locking wheel (302) is provided with a locking protrusion (3021), and the locking protrusion (3021) can be locked in any of the locking slots (3011). When the locking wheel (302) is switched to the locking position, the locking protrusion (3021) is locked in the locking slot (3011) at the corresponding position.

3. The screwdriver head according to claim 1, characterized in that The screwdriver head further comprises a protective shell (500), the drive shaft (100), the adjustable transmission assembly (200), the locking assembly (300) and the output cutter head (400) are all arranged inside the protective shell (500), an adjustment opening (501) is provided on the protective shell (500), and the output end of the output cutter head (400) passes through the adjustment opening (501) and extends to the outside of the protective shell (500).

4. The screwdriver bit according to claim 3, characterized in that: The adjustable transmission assembly (200) comprises a first gear (201), a second gear (202), a third gear (203) and an intermediate shaft (204); the intermediate shaft (204) is arranged on the protective housing, and the intermediate shaft (204) is perpendicular to the drive shaft (100) and the output cutter head (400); the first gear (201) is arranged on the drive shaft (100); the second gear (202) is arranged on the intermediate shaft (204); the third gear (203) is arranged on the output cutter head (400); the first gear (201), the second gear (202) and the third gear (203) are meshed in sequence; the third gear (203) can rotate circumferentially around the intermediate shaft (204), so that the angle between the output cutter head (400) and the drive shaft (100) is adjustable.

5. The screwdriver bit according to claim 4, characterized in that: The locking assembly (300) further comprises a return spring (303) and a drive button (304); the locking wheel (302) is slidably disposed on the intermediate shaft (204); and the return spring (303) and the drive button (304) are respectively disposed on both sides of the locking wheel (302).

6. The screwdriver bit according to claim 3, characterized in that: A dustproof component is provided inside the protective shell (500), and the dustproof component is arranged between the protective shell (500) and the cutter head fixing frame (301) and is used to cover the adjustment port (501).

7. The screwdriver bit according to claim 6, characterized in that The dustproof component comprises a dustproof baffle (601), the dustproof baffle (601) being slidably arranged between the protective shell (500) and the cutter head fixing frame (301), and a limiting protrusion (3012) being arranged on the outer side wall of the cutter head fixing frame (301), the limiting protrusion (3012) being able to abut against the dustproof baffle (601), and when the angle of the output cutter head (400) is adjusted, the limiting protrusion (3012) can push the dustproof baffle (601) to slide along the adjustment opening (501).

8. The screwdriver bit according to claim 3, characterized in that: The protective shell (500) comprises a first shell (502) and a second shell (503) which are symmetrically arranged. The first shell (502) and the second shell (503) are provided with fixing screw holes (504), and studs (700) can be inserted into the fixing screw holes (504). The first shell (502) and the second shell (503) are detachably connected via the studs (700).

9. An electric screwdriver, characterized in that: It comprises a screwdriver head as claimed in any one of claims 1 to 8, a drive motor (800) and a gear transmission (900), wherein the output shaft of the drive motor (800) is connected to the drive shaft (100) of the screwdriver head via the gear transmission (900).

10. The electric screwdriver according to claim 9, characterized in that: The electric screwdriver further comprises a storage battery (1000), and the storage battery (1000) is electrically connected to the drive motor (800).

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