Electric screwdriver

Abstract

The utility model discloses an electric screwdriver which comprises a shell, a PCBA circuit board, a torsion electric quantity display screen and a torsion gear switching button. The shell is provided with an opening used for being matched with the torsion electric quantity display screen. The torsion electric quantity display screen is arranged at the opening and is connected with the shell; a groove, a plurality of gear display light-transmitting parts and a plurality of electric quantity display light-transmitting parts are arranged on the top surface of the torsion electric quantity display screen; and the torsion gear switching button passes through the groove and is in buckled connection with the torsion electric quantity display screen. The PCBA circuit board is arranged in the shell, a microswitch and a plurality of light-emitting parts are installed on the PCBA circuit board, and the microswitch is located below the torsion gear switching button and used for being triggered by the torsion gear switching button when the torsion gear switching button is pressed down, so that the torsion gear is changed; and the plurality of light-emitting pieces are respectively positioned below the plurality of gear display light-transmitting parts and the plurality of electric quantity display light-transmitting parts in a one-to-one correspondence manner. The device is compact in structure and easy to assemble.

Description

Technical Field

[0001] The utility model relates to electric tool technology, in particular to an electric screwdriver. Background Art

[0002] An electric screwdriver includes a housing, PCBA circuit board, motor, gearbox, and bit. The motor drives the bit through the gearbox to rotate, loosening or tightening the screw. Some electric screwdrivers have torque adjustment and battery level display functions. They can output different torques according to the different torque levels selected by the user to prevent screws from being stripped. By actively or passively displaying the battery level, they remind users to charge the screwdriver at the appropriate time, thereby ensuring the sustainability of the screwdriver. However, the torque level switch button, torque display, and battery level display of these electric screwdrivers are usually arranged relatively dispersed (for example, some electric screwdrivers arrange the torque level switch button, multiple LED light beads that constitute the torque display, and the light-transmitting portion that constitutes the battery level display in a straight line on the electric screwdriver housing). This makes the overall structure of the electric screwdriver less compact and more complicated to manufacture and assemble.

[0003] In addition, the internal motor of an existing straight-handle electric screwdriver is usually in direct contact with the outer casing, which traps hot air in one place, resulting in poor heat dissipation and easy overheating. The lanyard opening on the straight-handle electric screwdriver is usually a right-angle opening, which makes it difficult to thread the lanyard. These shortcomings affect the user experience. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide an electric screwdriver which has a compact structure and is easy to assemble.

[0005] A further technical problem to be solved by the present invention is to provide an electric screwdriver with good heat dissipation effect.

[0006] Another technical problem to be solved by the present invention is to provide an electric screwdriver that is easy to thread a hanging rope.

[0007] An electric screwdriver according to an embodiment of the utility model includes a housing, a PCBA circuit board, a torque and power display screen, and a torque gear switching button; the housing is provided with an opening for adapting to the torque and power display screen; the torque and power display screen is arranged in the opening and connected to the housing; the top surface of the torque and power display screen is provided with a groove, multiple gear display light-transmitting portions, and multiple power display light-transmitting portions; the torque gear switching button passes through the groove and is snap-connected to the torque and power display screen; the PCBA circuit board is arranged inside the housing, and a micro switch and multiple light-emitting components are installed on the PCBA circuit board. The micro switch is located below the torque gear switching button and is used to be triggered by the torque gear switching button when the torque gear switching button is pressed, thereby changing the torque gear; the multiple light-emitting components are respectively located below the multiple gear display light-transmitting portions and the multiple power display light-transmitting portions.

[0008] The above-mentioned electric screwdriver, wherein the shell includes a left half shell and a right half shell, the left half shell and the right half shell are matched with each other and are detachably connected; the torque and power display screen is set on the top of the shell.

[0009] The above-mentioned electric screwdriver, wherein the inner wall of the left half shell is provided with a first ventilation groove, and the inner wall of the right half shell is provided with a second ventilation groove, the first ventilation groove and the second ventilation groove both extend along the axial direction of the shell and are opposite to each other; the electric screwdriver includes a motor, the motor is arranged in the shell, and the two opposite side surfaces of the motor shell are respectively provided with a first air outlet and a second air outlet, the first air outlet is opposite to the first ventilation groove, and the second air outlet is opposite to the second ventilation groove.

[0010] The above-mentioned electric screwdriver, wherein the inner wall of the left half shell is provided with a first arc-shaped groove, the two ends of the first arc-shaped groove are open to the outer surface of the left half shell, and the inner wall of the left half shell surrounded by the first arc-shaped groove is provided with a positioning groove; the inner wall of the right half shell is provided with a second arc-shaped groove that is mirror-symmetrical to the first arc-shaped groove, the two ends of the second arc-shaped groove are open to the outer surface of the right half shell, and the inner wall of the right half shell surrounded by the second arc-shaped groove is provided with a hanging rope column, and the top of the hanging rope column is provided with a positioning protrusion adapted to the positioning groove, and the positioning protrusion is embedded in the positioning groove.

[0011] The utility model has at least the following advantages:

[0012] 1. Compared with the prior art, the electric screwdriver of this embodiment has the torque gear switch button, multiple gear display light-transmitting portions, and multiple power display light-transmitting portions all arranged on the torque and power display screen. The overall structure is more compact and highly integrated. During assembly, only the torque and power display screen needs to be connected to the housing, which improves the assembly speed.

[0013] 2. In the embodiment of the present invention, a first ventilation groove and a second ventilation groove are respectively provided on the inner walls of the left and right half shells, forming a hot air flow channel between the air outlet of the motor and the inner wall of the shell, thereby increasing the heat dissipation area, accelerating heat transfer, and reducing the overheating of the entire machine;

[0014] 3. The hanging rope opening of the embodiment of the utility model is composed of a first arc-shaped groove and a second arc-shaped groove, which makes it easier to thread the hanging rope. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The figure shows the appearance of an electric screwdriver according to an embodiment of the present invention.

[0016] Figure 2 A cross-sectional schematic diagram of an electric screwdriver according to an embodiment of the present utility model is shown.

[0017] Figure 3 and Figure 4 Schematic diagrams of a torque and electrical quantity display screen according to an embodiment of the present invention are shown from the front and back respectively.

[0018] Figure 5 A schematic diagram of a torque gear shift button according to an embodiment of the present invention is shown.

[0019] Figure 6 Shown Figure 2 An enlarged schematic diagram of the P part, in which the torque power display screen and the torque gear switch button are in assembled state.

[0020] Figure 7 A schematic diagram of the assembly of a torque and electrical quantity display screen according to an embodiment of the present invention is shown.

[0021] Figure 8 Shown Figure 7 Schematic diagram of part A.

[0022] Figure 9 A schematic diagram of a motor heat dissipation structure according to an embodiment of the present utility model is shown.

[0023] Figure 10 Shown Figure 9 BB cross-section diagram.

[0024] Figure 11 and Figure 12 Schematic diagrams of a left half shell and a right half shell according to an embodiment of the present invention are respectively shown.

[0025] Figure 13 and Figure 14 Partially enlarged schematic diagrams of the left half shell and the right half shell according to an embodiment of the present utility model are respectively shown. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Please refer to Figures 1 to 8 An electric screwdriver according to an embodiment of the present invention includes a housing 1 , a PCBA circuit board 2 , a torque and power display screen 3 , a torque gear shift button 4 , a motor 5 , a gear box 6 and a battery cell 7 .

[0028] The housing 1 is provided with an opening 10 for matching with the torque and power display screen 3. The torque and power display screen 3 is provided in the opening 10 and is connected to the housing 1. In this embodiment, the torque and power display screen 3 includes a display screen body 3a and a convex ring 3b provided on the side of the display screen body and extending circumferentially, and the outer peripheral surface of the convex ring 3b is provided with a first anti-rotation plane 3c and a second anti-rotation plane 3d that are parallel and opposite to each other. The side wall of the opening 10 is provided with a slot 10b that matches with the convex ring 3b, and the inner wall of the slot 10b is provided with a first limiting plane 101 and a second limiting plane 102 that are parallel and opposite to each other. The convex ring 3b is inserted into the slot 10b, and the first limiting plane 101 matches with the first anti-rotation plane 3c, and the second limiting plane 102 matches with the second anti-rotation plane 3d to prevent the torque and power display screen 3 from rotating relative to the housing 1.

[0029] Furthermore, a foolproof notch 3e is provided on the side of the convex ring 3b, and a foolproof rib 10e is provided on the side wall of the opening 10 to cooperate with the foolproof notch 3e, and the foolproof rib 10e is embedded in the foolproof notch 3e.

[0030] The top surface of the torque and power display screen 3 is provided with a groove 30, a plurality of gear display light-transmitting portions 31 and a plurality of power display light-transmitting portions 32. The torque gear switching button 4 passes through the groove 30 and is snap-connected to the torque and power display screen 3. Specifically, the bottom wall 300 of the groove 30 is provided with a through hole 301; the torque gear switching button 4 includes a button head 4a, a top rod 4b and a snap-on portion 4c. The top rod 4b and the snap-on portion 4c are respectively connected to the button head 4a. The button head 4a is placed in the groove 30. The top rod 4b and the snap-on portion 4c pass through the through hole 301. The snap-on portion 4c is snap-connected to the torque and power display screen 3. In this embodiment, the snap-on portion 4c includes a plurality of hooks 41 (three hooks in the figure). The plurality of hooks 41 pass through the through hole 301. The hook head 411 of each hook 41 snaps onto the back side of the bottom wall 300 of the groove 30.

[0031] The PCBA circuit board 2 is arranged inside the shell 1. A micro switch 2a and multiple light-emitting components 2b are installed on the PCBA circuit board 2. The micro switch 2a is located below the torque gear switch button 4 and is used to be triggered by the top rod 4b of the torque gear switch button when the torque gear switch button 4 is pressed, thereby changing the torque gear; the multiple light-emitting components 2b are respectively located below the multiple gear display light-transmitting portions 31 and the multiple power display light-transmitting portions 32 in a one-to-one correspondence.

[0032] In this embodiment, the groove 30 is provided in the middle of the top surface of the torque and power display screen 3, and a plurality of gear position display light-transmitting portions 31 and a plurality of power display light-transmitting portions 32 surround the groove 30. The plurality of gear position display light-transmitting portions 31 and the plurality of power display light-transmitting portions 32 are arranged alternately, that is, each gear position display light-transmitting portion 31 is flanked by power display light-transmitting portions 32, and each power display light-transmitting portion 32 is flanked by gear position display light-transmitting portions 31.

[0033] In this embodiment, the material of the torque and power display screen 3 is plastic, and the color is light-colored, such as gray, green, etc., which is convenient for light-transmitting display. The light-emitting component 2b uses an LED lamp bead, preferably a surface-mount LED lamp bead. Each gear display light-transmitting portion 31 is a character-shaped groove opened on the top surface of the torque and power display screen. A first light-guiding cavity 33 extending along the thickness direction of the torque and power display screen is provided directly below each character-shaped groove. The first light-guiding cavity 33 passes through the bottom surface of the torque and power display screen 3. The thickness X of the bottom wall 311 of the character-shaped groove is 0.2mm-0.3mm, which ensures that the light emitted by the light-emitting component 2b can be transmitted from the character-shaped groove. Each power display portion 32 is an elliptical groove formed on the top surface of the torque power display screen. A second light-guiding cavity (not shown) extending along the thickness direction of the torque power display screen is provided directly below each elliptical groove. The second light-guiding cavity extends through the bottom surface of the torque power display screen. The bottom wall thickness of the elliptical groove is 0.2 mm to 0.3 mm, ensuring that the light emitted by the light-emitting element 2 b can be transmitted through the elliptical groove. Preferably, the circumferential extension of the torque power display screen portion 35 between the gear position display light-transmitting portion 31 and the power display light-transmitting portion 32 is thicker than the bottom wall thickness of the character-shaped groove and the elliptical groove, and is 0.4 mm in this embodiment.

[0034] Furthermore, the bottom of the torque and electrical quantity display screen 3 is also provided with a plurality of downwardly extending light-blocking protrusions 36. The plurality of light-blocking protrusions 36 are arranged circumferentially, and there is one light-blocking protrusion 36 between each two adjacent light-emitting elements 2b, thereby ensuring that there is no light leakage between the two adjacent light-emitting elements 2b.

[0035] In some specific embodiments, the electric screwdriver has four gears, the character-shaped grooves are in the shape of Arabic numerals 1, 2, 3, and 4, and the number of the oval grooves is also four, such as Figure 3 As shown, there are eight light-blocking protrusions 36. In other embodiments, the power display light-transmitting portion 32 may also be a circular groove.

[0036] Figure 1 Also shown is a ring lampshade 81 of the electric screwdriver, a forward and reverse button 82 and a flashlight button 83 provided on the housing 1. These components are irrelevant to the technical problem to be solved by this application and will not be described in detail here.

[0037] Please refer to Figures 9 to 12 In this embodiment, the housing 1 includes a left half-shell 1a and a right half-shell 1b. The left half-shell 1a and the right half-shell 1b are aligned with each other and are detachably connected. Connection methods include, but are not limited to, screw connections and / or snap connections. The torque and power display 3 is disposed on the top of the housing 1.

[0038] The motor 5, gearbox 6, and battery cell 7 are each housed within the housing 1. A first air outlet 51 and a second air outlet 52 are provided on opposite sides of the motor housing. The inner wall of the left half of the housing 1a is provided with a first ventilation groove 11, while the inner wall of the right half of the housing 1b is provided with a second ventilation groove 12. Both the first and second ventilation grooves 11, 12 extend axially along the housing 1 and face each other. The first air outlet 51 is positioned opposite the first ventilation groove 11, while the second air outlet 52 is positioned opposite the second ventilation groove 12.

[0039] The hot air generated by the motor 5 is released from the first air outlet 51 and the second air outlet 52, and flows out through the first ventilation groove 11 and the second ventilation groove 12, thereby flowing smoothly through the inner cavity of the entire housing 1 (see FIG. Figure 11 and Figure 12 The hot air flow track is shown by the arrow in the middle), thereby increasing the heat dissipation area and ensuring the safety of the entire machine.

[0040] Please refer to Figure 13 and Figure 14 The inner wall of the left half-shell 1a is provided with a first arcuate groove 13, with both ends opening onto the outer surface of the left half-shell 1a (in this embodiment, at the corners of the rear end of the left half-shell 1a). A positioning groove 131 is provided on the inner wall 161 of the left half-shell surrounded by the first arcuate groove 13. A second arcuate groove 14, mirror-symmetrical to the first arcuate groove 13, is provided on the inner wall of the right half-shell 1b. A lanyard post 15 is provided on the inner wall 162 of the right half-shell surrounded by the second arcuate groove 14. A positioning protrusion 151 is provided at the top of the lanyard post 15, which mates with the positioning groove 131. When the left and right half-shells 1a and 1b are closed, the positioning protrusion 151 engages with the positioning groove 131, ensuring a secure fit. When the left and right half-shells 1a and 1b are closed, the lanyard can be smoothly passed through the first and second arcuate grooves 13 and 14.

[0041] Compared with the prior art, the electric screwdriver of this embodiment has the torque gear switching button, multiple gear display light-transmitting parts and multiple power display light-transmitting parts all arranged on the torque and power display screen. The overall structure is more compact and highly integrated. During assembly, it is only necessary to snap the torque and power display screen together with the shell, which improves the assembly speed.

[0042] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. An electric screwdriver, characterized in that: Including housing, PCBA circuit board, torque power display screen and torque gear switch button; The housing is provided with an opening adapted to fit the torque and electrical quantity display screen; The torque and power display screen is arranged in the opening and connected to the housing; the top surface of the torque and power display screen is provided with a groove, a plurality of gear display light-transmitting portions and a plurality of power display light-transmitting portions; the torque gear shift button passes through the groove and is snap-connected to the torque and power display screen; The PCBA circuit board is arranged inside the shell, and a micro switch and multiple light-emitting components are installed on the PCBA circuit board. The micro switch is located below the torque gear switch button and is used to be triggered by the torque gear switch button when the torque gear switch button is pressed, thereby changing the torque gear; the multiple light-emitting components are respectively located below the multiple gear display light-transmitting portions and the multiple power display light-transmitting portions in a one-to-one correspondence.

2. The electric screwdriver according to claim 1, characterized in that: The bottom wall of the groove is provided with a through hole; The torque gear switching button includes a button head, a push rod and a snap part. The push rod and the snap part are respectively connected to the button head. The button head is placed in the groove. The push rod and the snap part pass through the through hole. The snap part is snap-connected to the torque power display screen. The micro switch is located below the push rod.

3. The electric screwdriver according to claim 2, characterized in that: The buckle portion includes a plurality of hooks, which pass through the through holes, and the hook head of each hook buckles the back side of the bottom wall of the groove.

4. The electric screwdriver according to claim 1, wherein: The torque and electrical quantity display screen includes a display screen body and a convex ring provided on a side of the display screen body and extending in a circumferential direction, wherein the outer circumferential surface of the convex ring is provided with a first anti-rotation plane and a second anti-rotation plane which are parallel to each other and opposite to each other; The side wall of the opening is provided with a slot that matches the convex ring, and the inner wall of the slot is provided with a first limiting plane and a second limiting plane that are parallel to each other and opposite to each other; The convex ring is inserted into the slot, the first limiting plane cooperates with the first anti-rotation plane, and the second limiting plane cooperates with the second anti-rotation plane to prevent the torque and power display screen from rotating relative to the housing.

5. The electric screwdriver according to claim 4, characterized in that: The side surface of the convex ring is provided with an anti-foolproof notch, and the side wall of the opening is provided with an anti-foolproof rib that cooperates with the anti-foolproof notch, and the anti-foolproof rib is embedded in the anti-foolproof notch.

6. The electric screwdriver according to claim 1, wherein: The groove is arranged at the middle position of the top surface of the torque and electric quantity display screen, and the multiple gear display light-transmitting portions and the multiple electric quantity display light-transmitting portions surround the groove.

7. The electric screwdriver according to claim 6, characterized in that: The plurality of gear position display light-transmitting portions and the plurality of power display light-transmitting portions are arranged alternately with each other.

8. The electric screwdriver according to claim 6, wherein: The bottom of the torque and electrical quantity display screen is provided with a plurality of light-blocking protrusions extending downwards. The plurality of light-blocking protrusions are arranged in a circumferential direction, and there is one light-blocking protrusion between every two adjacent light-emitting elements.

9. The electric screwdriver according to claim 1, wherein: Each gear display light-transmitting portion is a character-shaped groove opened on the top surface of the torque and power display screen. A first light-guiding cavity extending along the thickness direction of the torque and power display screen is provided directly below each character-shaped groove. The first light-guiding cavity passes through the bottom surface of the torque and power display screen. The bottom wall thickness of the character-shaped groove is 0.2mm-0.3mm.

10. The electric screwdriver according to claim 1, wherein: Each of the power display light-transmitting portions is an elliptical groove or a circular groove opened on the top surface of the torque power display screen. A second light-guiding cavity extending along the thickness direction of the torque power display screen is provided directly below each elliptical groove or each circular groove. The second light-guiding cavity passes through the bottom surface of the torque power display screen, and the bottom wall thickness of the elliptical groove or the circular groove is 0.2mm-0.3mm.

11. The electric screwdriver according to claim 1, wherein: The housing comprises a left half shell and a right half shell, wherein the left half shell and the right half shell are aligned with each other and are detachably connected; The torque and power display screen is arranged on the top of the shell.

12. The electric screwdriver according to claim 11, wherein: The inner wall of the left half shell is provided with a first ventilation groove, and the inner wall of the right half shell is provided with a second ventilation groove, the first ventilation groove and the second ventilation groove both extend along the axial direction of the outer shell and are opposite to each other; The electric screwdriver includes a motor, which is arranged in the shell. Two opposite sides of the motor shell are respectively provided with a first air outlet and a second air outlet. The first air outlet is opposite to the first ventilation groove, and the second air outlet is opposite to the second ventilation groove.

13. The electric screwdriver according to claim 11, wherein: The inner wall of the left half shell is provided with a first arc-shaped groove, both ends of the first arc-shaped groove are open to the outer surface of the left half shell, and the inner wall of the left half shell surrounded by the first arc-shaped groove is provided with a positioning groove; The inner wall of the right half shell is provided with a second arc-shaped groove that is mirror-symmetrical to the first arc-shaped groove, and both ends of the second arc-shaped groove are open to the outer surface of the right half shell. The inner wall of the right half shell surrounded by the second arc-shaped groove is provided with a hanging rope column, and the top of the hanging rope column is provided with a positioning protrusion adapted to the positioning groove, and the positioning protrusion is embedded in the positioning groove.

14. The electric screwdriver according to any one of claims 1 to 13, characterized in that: The shell is made of plastic; Each of the light-emitting components is an LED lamp bead.

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