A safety protection device for silent electric drills

Abstract

This utility model provides a safety protection device for a silent electric drill, relating to the field of electric drill technology. It includes a drill body and a drill bit. A drive motor is fixed to one side of the drill body. A mounting component is located on the side of the drill body near the drive motor, and a planetary gearbox is connected to the surface of the mounting component. One end of the planetary gearbox has a low-speed end interface, and the side of the drill body away from the drive motor has a high-speed end interface. This utility model achieves this by adding a safety protective shell to the original drill body. Depending on the usage environment, either the high-speed or low-speed end interface can be isolated. The safety protective shell uses a unified interface for both the high-speed and low-speed end interfaces. In different operating modes, a single safety protective shell is used to isolate and protect the other end. The design of this utility model's safety protective shell fundamentally prevents the possibility of accidents and effectively improves the safety of silent electric drills during use.

Description

Technical Field

[0001] This utility model relates to the field of electric drill technology, and in particular to a safety protection device for silent electric drills. Background Technology

[0002] A silent electric drill is a specially designed electric drilling device that operates with low noise. It is primarily used to detect movement from targets within walls and to drill silently into walls made of various materials such as brick, concrete, and mortar. Due to its specialized function and working environment, it features high drilling speed, high torque, low noise, small size, light weight, forward and reverse rotation, adjustable speed, ability to drill various media, simple operation, and portability. To achieve these characteristics, a silent electric drill typically uses a single spindle to perform its functions.

[0003] In the existing technology, in order to achieve the requirements of small size and light weight, silent electric drills use the same spindle for both working modes. When one end is working, the other end is generally not protected by corresponding safety measures. As a result, if a misoperation occurs during use, such as when a worker's body, clothing or foreign objects come into contact with the unprotected interface, it may cause personal injury or equipment damage, leading to a production accident. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a safety protection device for silent electric drills.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a safety protection device for a silent electric drill, comprising an electric drill body and a drill bit, wherein a drive motor is fixed on one side of the electric drill body, and a mounting component is provided on the side of the electric drill body near the drive motor, wherein a planetary gearbox is connected to the surface of the mounting component, wherein a low-speed end interface is provided at one end of the planetary gearbox, and a high-speed end interface is provided on the side of the electric drill body away from the drive motor, wherein both the high-speed end interface and the mounting component are provided with mounting interfaces, wherein a safety protective shell is fixed on the surface of the mounting interface, wherein the safety protective shell comprises a cylindrical component, and a circular ring is fixed at one end of the cylindrical component.

[0006] Preferably, the inner wall of the mounting interface has multiple arc grooves, and the circumferential surface of the ring is fixed with multiple clips. The surface of the clips is in contact with the inner wall of the arc groove and is fixed by friction.

[0007] Preferably, one end of the clip has a T-shaped groove, and one end of the inner wall of the arc groove has an L-shaped component fixed thereon, the surface of the L-shaped component being snapped and fixed to the inner wall of the T-shaped groove.

[0008] Preferably, the mounting component has multiple inclined grooves at the junction with the mounting interface, and the edge of the clip away from the annular component is set as a side arc edge.

[0009] Preferably, one end of the card has a contact arc surface, the inner wall of the T-slot has a release arc surface, and one end of the L-shaped component is set as a round end.

[0010] Preferably, a fixing triangular piece is fixed to one end of the card, and one side of the fixing triangular piece is fixed to one end of the cylindrical piece.

[0011] Preferably, one end of the L-shaped part is fixed with a reinforcing rib, and one side of the reinforcing rib is fixed to the inner wall of the arc groove.

[0012] Preferably, a plurality of abutting adhesive strips are fixed to one end of the inner wall of the arc groove, and the periphery of the abutting adhesive strips is provided with a deformation reserved groove.

[0013] Beneficial effects:

[0014] 1. This utility model achieves this by adding a safety protective shell to the original electric drill body. It isolates the high-speed or low-speed end interface according to the usage environment. In normal mode, the high-speed end is used for drilling, while under the high torque conditions provided by the planetary gearbox, the low-speed end is used. The safety protective shell uses a unified interface for both the high-speed and low-speed end interfaces. Therefore, in different working modes, only one safety protective shell is needed to isolate and protect the other end. The design of this utility model's safety protective shell fundamentally prevents the possibility of accidents and effectively improves the safety of the silent electric drill during use.

[0015] 2. This utility model achieves pressure fixation through the friction between the clamp and the arc groove, preventing the vibration generated by the drill body during use from causing relative rotation between the safety shell and the drill body. This improves the fit between the safety shell and the drill body, thereby enhancing the stability between them.

[0016] 3. This utility model achieves the snap-fit ​​between the T-slot and the L-shaped part, which further maintains the position of the inner wall of the clip in the arc groove, preventing relative rotation between the safety shell and the electric drill body, which would cause the safety shell to detach and fall off during operation, thus improving the installation stability of the safety shell. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a three-dimensional structural diagram of the safety protective shell of this utility model;

[0019] Figure 3 This is a three-dimensional structural diagram of the mounting component of this utility model;

[0020] Figure 4 This is an exploded view of the installation interface of this utility model;

[0021] Figure 5 This is a three-dimensional structural diagram of the inclined groove of this utility model;

[0022] Figure 6 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 7 This is a sectional view of the L-shaped component of this utility model;

[0024] Figure 8 This is a three-dimensional structural diagram of the adhesive strip of this utility model.

[0025] Legend:

[0026] 1. Drill body; 101. Drive motor; 102. High-speed end interface; 103. Drill bit; 104. Planetary gearbox; 105. Low-speed end interface; 106. Mounting components;

[0027] 2. Safety protective shell; 201. Cylindrical component; 202. Circular component; 203. Mounting interface;

[0028] 3. Card; 301, arc groove;

[0029] 4. T-slot; 401, L-shaped part;

[0030] 5. Inclined groove; 501. Side arc edge of part;

[0031] 6. Contacting the curved surface; 601. Round end; 602. Detaching from the curved surface;

[0032] 7. Fix the triangular parts;

[0033] 8. Reinforcing ribs;

[0034] 9. Adhesive strip; 901. Deformation groove. Detailed Implementation

[0035] To make the technical means, creative features, and achieved objectives and effects of this utility model easier to understand, the present utility model is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described in the implementation plan without creative effort are all within the protection scope of this utility model.

[0036] The specific embodiments of this utility model are described below with reference to the accompanying drawings. Specific Implementation Example 1:

[0038] Reference Figures 1-8 A safety protection device for a silent electric drill includes a drill body 1 and a drill bit 103. A drive motor 101 is fixed to one side of the drill body 1. A mounting component 106 is provided on the side of the drill body 1 near the drive motor 101. A planetary gearbox 104 is connected to the surface of the mounting component 106. A low-speed end interface 105 is provided at one end of the planetary gearbox 104. A high-speed end interface 102 is provided on the side of the drill body 1 away from the drive motor 101. Both the high-speed end interface 102 and the mounting component 106 are provided with mounting interfaces 203. A safety protective shell 2 is fixed to the surface of the mounting interface 203. The safety protective shell 2 includes a cylindrical component 201, one end of which is fixed... The device includes a circular ring 202. By adding a safety protective shell 2 to the original electric drill body 1, the high-speed end interface 102 or the low-speed end interface 105 is isolated according to the usage environment. In normal mode, the high-speed end is used for drilling, while under the high torque conditions of the planetary reducer 104, the low-speed end is used for drilling. The safety protective shell 2 interface used for both the high-speed end interface 102 and the low-speed end interface 105 is the same. Therefore, in different working modes, a single safety protective shell 2 is used to isolate and protect the other end. The design of the safety protective shell 2 of this utility model fundamentally prevents the possibility of accidents.

[0039] Multiple arc grooves 301 are formed on the inner circumferential surface of the mounting interface 203, and multiple clips 3 are fixed on the circumferential surface of the ring part 202. The surface of the clips 3 is attached to the inner wall of the arc grooves 301 and fixed by friction. Pressure fixation is achieved by the friction between the clips 3 and the arc grooves 301, which prevents the vibration generated by the electric drill body 1 during use from causing relative rotation between the safety shell 2 and the electric drill body 1, thereby improving the matching effect between the safety shell 2 and the electric drill body 1.

[0040] One end of the clamp 3 has a T-slot 4, and one end of the inner wall of the arc groove 301 is fixed with an L-shaped part 401. The surface of the L-shaped part 401 is snapped and fixed to the inner wall of the T-slot 4. Through the snapping and engagement between the T-slot 4 and the L-shaped part 401, the inner wall of the clamp 3 is further kept in position in the arc groove 301, preventing relative rotation between the safety shell 2 and the electric drill body 1, which would cause the safety shell 2 to detach and fall off during operation.

[0041] Multiple inclined grooves 5 are provided at the junction of the mounting part 106 and the mounting interface 203. The edge of the clamping part 3 away from the ring part 202 is set as the side arc edge 501. The clamping part 3 is guided to elastically deform through the contact between the inclined groove 5 and the side arc edge 501, so that it can be easily inserted into the arc groove 301.

[0042] One end of the clip 3 is provided with a contact arc surface 6, and the inner wall of the T-slot 4 is provided with a release arc surface 602. One end of the L-shaped part 401 is set as a round end 601. When the operator rotates the safety protective shell 2 so that one end of the clip 3 contacts the L-shaped part 401, the round end 601 contacts the contact arc surface 6 to guide the elastic deformation of the L-shaped part 401, thereby conveniently allowing the L-shaped part 401 to be inserted into the T-slot 4. When the operator wants to detach the L-shaped part 401 from the clip 3, the safety protective shell 2 is rotated in the opposite direction, so that the round end 601 and the release arc surface 602 slide to guide the elastic deformation of the L-shaped part 401, thereby causing the clip to be released.

[0043] One end of the clip 3 is fixed with a fixing triangular piece 7. One side of the fixing triangular piece 7 is fixed to one end of the cylindrical piece 201. The fixing triangular piece 7 enables the clip 3 to maintain stability when in contact with other components, prevents damage to the fixing point between the clip 3 and the cylindrical piece 201, and improves its service life.

[0044] One end of the L-shaped part 401 is fixed with a reinforcing rib 8. One side of the reinforcing rib 8 is fixed to the inner wall of the arc groove 301. The reinforcing rib 8 improves the fixing effect between the L-shaped part 401 and the mounting part 106, and at the same time provides springback to the elastic deformation of the L-shaped part 401.

[0045] Multiple abutment strips 9 are fixed to one end of the inner wall of the arc groove 301. Deformation reserved grooves 901 are opened on the circumference of the abutment strips 9 to prevent the clamp 3 from colliding with the inner wall of the arc groove 301 due to excessive rotation when the operator rotates the safety protective shell 2, thereby improving the service life of the clamp 3 and the mounting part 106. Specific Implementation Example 2:

[0047] Reference Figures 1-8In a nighttime wall detection operation at a construction company in Shenzhen, staff used the structure disclosed in this utility model. They equipped five silent electric drills with the safety protection device of this utility model. The main body of the drill 1 has a power of 1200 watts, the drive motor 101 has an adjustable speed of 0-2800 rpm, the high-speed end interface 102 directly outputs a speed of 2800 rpm, and the mounting part 106 connects to the planetary gearbox 104 (reduction ratio 1:5) and the low-speed end interface 105 outputs a speed of 560 rpm and increases the torque to 48 N·m. When the construction worker drills for concrete sampling, a diamond drill bit (20 mm in diameter) is inserted into the low-speed end interface 105. Then, the safety protective shell 2 is installed onto the high-speed end interface 102. Holding the cylindrical component 201 made of nylon 66 + 30% glass fiber, the four clips 3 (4 mm thick) of the ring component 202 are aligned with the inclined groove 5 (22° inclination angle) of the high-speed end interface 102 and pressed in. The side arc edge 501 (curvature R = 0.8 mm) guides the clips 3 to elastically deform 0.5 mm and slide into the arc groove 301 (6 mm depth). The safety protective shell 2 is then rotated clockwise approximately 15... The contact arc surface 6 (curvature R = 2 mm) of the clamping part 3 pushes the round end 601 (diameter 3.5 mm) of the L-shaped part 401, causing the L-shaped part 401 to undergo 0.3 mm of elastic deformation until the L-shaped part 401 is fully engaged in the T-slot 4 (slot width 4.2 mm) and locked in place. At this time, the EPDM rubber contact strip 9 (hardness 60 Shore A) inside the arc groove 301 absorbs the rotational interference through the deformation reserved groove 901, fixing the triangular part 7 (base width 5 mm) to enhance the bending strength of the base of the clamping part 3, and the reinforcing rib 8 (thickness 2.5 mm) to ensure that the L-shaped part 401 does not loosen under vibration. When the electric drill is working, the high-speed end is completely enclosed by the protective shell, and the operator maintains a safe distance of 50 mm from the rotating parts. When switching to the thin steel plate drilling mode, rotate the protective shell counterclockwise to allow the L-shaped part 401 to slide out along the disengagement arc surface 602 (tilt angle 30 degrees). After removing the protective shell, replace it with a high-speed twist drill bit (6 mm in diameter), and then install the same protective shell onto the low-speed end interface 105. Statistics from six months of continuous operation show that accidental contact with the unprotected end has decreased from 11 times per thousand unit hours in the traditional method to zero accidents. The protective shell disassembly and assembly time is less than or equal to 3 seconds per operation, and the wear of the contact rubber strip 9 is less than 0.2 mm after 2000 disassembly and assembly cycles.

[0048] The working principle of this utility model is as follows: When using the low-speed end interface 105, the planetary gearbox 104 is installed on the mounting part 106. When the operator needs to use the high-speed end interface 102 or the low-speed end interface 105, the drill bit 103 is installed on it, and then the safety protective shell 2 is installed on the unused interface. The locking piece 3 of the ring part 202 is aligned with the corresponding inclined groove 5 of the interface and pressed down, so that the contact between the inclined groove 5 and the side arc edge 501 of the part guides the elastic deformation of the locking piece 3, thereby conveniently locking into the arc groove 301. Then the operator rotates the safety protective shell 2 clockwise, and the locking piece 3 and the ring part 202 are engaged. The friction between the arc grooves 301 achieves pressure fixation, preventing the vibration generated by the drill body 1 during use from causing relative rotation between the safety shell 2 and the drill body 1. Continued rotation causes one end of the clamp 3 to contact the round end 601 of the L-shaped part 401, guiding the elastic deformation of the L-shaped part 401 so that it can be easily inserted into the T-groove 4, keeping the safety shell 2 and the drill body 1 fixed and preventing them from separating. The contact strip 9 prevents the clamp 3 from colliding with the inner wall of the arc groove 301 due to excessive rotation when the operator rotates the safety shell 2.

[0049] When the staff finishes using the device or needs to replace the protected interface, rotate the safety protective shell 2 counterclockwise. This causes the round end 601 to slide and guide the L-shaped part 401 to elastically deform between the round end 601 and the detached arc surface 602, thus releasing the buckle and disengaging it. Then, rotate the clip 3 to the inclined groove 5 and pull the safety protective shell 2 outward to disengage the clip 3 from the arc groove 301.

[0050] The fixed triangular piece 7 enables the clip 3 to maintain stability when in contact with other components, preventing damage to the fixing point between the clip 3 and the cylindrical piece 201. The reinforcing rib 8 improves the fixing effect between the L-shaped piece 401 and the mounting piece 106, while providing springback to the elastic deformation of the L-shaped piece 401.

[0051] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0052] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A safety protection device for a silent electric drill, comprising a drill body (1) and a drill bit (103), wherein a drive motor (101) is fixed to one side of the drill body (1), and a mounting component (106) is provided on the side of the drill body (1) near the drive motor (101), a planetary gearbox (104) is connected to the surface of the mounting component (106), a low-speed end interface (105) is provided at one end of the planetary gearbox (104), and a high-speed end interface (102) is provided on the side of the drill body (1) away from the drive motor (101), characterized in that: Both the high-speed terminal interface (102) and the mounting component (106) are provided with mounting interfaces (203). A safety protective shell (2) is fixed on the surface of the mounting interface (203). The safety protective shell (2) includes a cylindrical component (201), and a ring component (202) is fixed at one end of the cylindrical component (201).

2. The safety protection device for a silent electric drill according to claim 1, characterized in that: The inner wall of the installation interface (203) has multiple arc grooves (301), and multiple clips (3) are fixed on the circumference of the ring (202). The surface of the clips (3) is attached to the inner wall of the arc grooves (301) and fixed by friction.

3. A safety protection device for a silent electric drill according to claim 2, characterized in that: The card (3) has a T-shaped groove (4) at one end, and an L-shaped part (401) is fixed to one end of the inner wall of the arc groove (301). The surface of the L-shaped part (401) is snapped and fixed to the inner wall of the T-shaped groove (4).

4. A safety protection device for a silent electric drill according to claim 3, characterized in that: The mounting component (106) has multiple inclined grooves (5) at the junction with the mounting interface (203), and the edge of the clip (3) away from the ring component (202) is set as a side arc edge (501).

5. A safety protection device for a silent electric drill according to claim 3, characterized in that: The card (3) has a contact arc surface (6) at one end, the T-slot (4) has a release arc surface (602) on the inner wall, and the L-shaped part (401) has a round end (601) at one end.

6. A safety protection device for a silent electric drill according to claim 2, characterized in that: One end of the clip (3) is fixed with a fixed triangular piece (7), and one side of the fixed triangular piece (7) is fixed to one end of the cylindrical piece (201).

7. A safety protection device for a silent electric drill according to claim 3, characterized in that: One end of the L-shaped part (401) is fixed with a reinforcing rib (8), and one side of the reinforcing rib (8) is fixed to the inner wall of the arc groove (301).

8. A safety protection device for a silent electric drill according to claim 2, characterized in that: Multiple abutting strips (9) are fixed at one end of the inner wall of the arc groove (301), and a deformation reserved groove (901) is opened on the periphery of the abutting strips (9).

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