Electric hand drill auxiliary device suitable for operation in narrow space

Abstract

The invention discloses an electric hand drill auxiliary device suitable for operation in a narrow space, and relates to the technical field of electric hand drill auxiliary equipment.The electric hand drill auxiliary device suitable for operation in the narrow space comprises a shell assembly, and a movable limiting pin is arranged on the shell assembly; the clamp assembly is installed on the shell assembly, the transmission assembly is installed in the shell assembly, when the limiting pin makes contact with the clamp assembly, the transmission assembly drives the clamp assembly to adjust the clamping range, and when the limiting pin does not make contact with the clamp assembly, the transmission assembly drives the clamp assembly to rotate as a whole. The problems that in the prior art, a wrench with an adjusting function cannot adapt to operation in a narrow space, and a clamp is inconvenient to adjust are effectively solved.

Description

Technical Field

[0001] This application relates to the field of electric drill auxiliary equipment technology, and in particular to an electric drill auxiliary device suitable for operation in confined spaces. Background Technology

[0002] When wiring the switchgear on the network side, the compact design of the equipment and the close proximity of the cable busbar to the cabinet mean that cables can only be fixed manually. The axial dimension of the electric drill is too long to reach into the equipment, which greatly reduces installation efficiency. In addition, personnel often cannot tighten the bolts to the required torque, and there are also safety risks when personnel reach into the equipment to operate.

[0003] Existing technology includes patent application number CN223493122U, entitled "A Nut Tightening Tool," which provides an auxiliary device for tightening nuts, but the clamping range of this device is not adjustable, causing inconvenience in use. Another patent application number is CN223084663U, entitled "An Anti-Slip Wrench," which provides a wrench with an adjustable clamping range; however, the wrench's adjusting components are large and require manual adjustment, making it unsuitable for confined working environments.

[0004] Invention Content

[0005] In view of this, the purpose of this application is to provide an auxiliary device for electric drills that is suitable for operation in narrow spaces, which effectively solves the problems of existing adjustable wrenches being unable to adapt to operation in narrow spaces and the inconvenience of clamp adjustment.

[0006] To achieve the above objectives, this application provides an auxiliary device for electric drills suitable for operation in confined spaces, comprising:

[0007] A housing assembly having a movable limiting pin;

[0008] A clamping assembly, which is mounted on the housing assembly, has an adjustable clamping range;

[0009] A transmission assembly is installed inside the housing assembly. When the limiting pin contacts the clamping assembly, the transmission assembly drives the clamping assembly to adjust the clamping range. When the limiting pin does not contact the clamping assembly, the transmission assembly drives the clamping assembly to rotate as a whole.

[0010] Preferably, the housing assembly is dumbbell-shaped and includes a power input end, a transmission part, and a power output end. Both the power input end and the power output end are tubular structures with hollow walls, and the transmission part is also hollow.

[0011] Preferably, the housing assembly includes an upper housing and a lower housing, which are connected by fixing bolts.

[0012] Preferably, a support column is installed at the power output end of the upper housing, and the limiting pin is slidably installed on the support column.

[0013] Preferably, the clamp assembly includes:

[0014] A limiting plate, wherein the limiting plate is an annular plate structure, and the limiting plate is rotatably mounted on the power output end of the housing assembly;

[0015] The gripper includes multiple grippers, which are evenly distributed around the circumference of the limiting plate, and the grippers are slidably mounted to the limiting plate;

[0016] A clamping screw ring is rotatably mounted above the gripper. The clamping screw ring has an annular plate structure and is coaxially mounted with the limiting plate. The upper end face of the gripper is provided with a thread that is compatible with the clamping screw ring.

[0017] A limiting post is installed on the upper end face of the clamp screw, and the limiting post can contact the limiting pin.

[0018] Preferably, the limiting plate is a split structure, which is composed of multiple arc-shaped plates. The two ends of the arc-shaped plates are provided with first sliding grooves, and the gripper is provided with a first slider that is adapted to the first sliding groove.

[0019] Preferably, the transmission assembly includes:

[0020] A first bevel gear is coaxially rotatably mounted on the power input end, and a square hole is provided in the middle of the first bevel gear;

[0021] The second bevel gear is coaxially rotatably mounted on the power output end, and the second bevel gear is a ring structure adapted to the limiting plate;

[0022] A transmission bevel gear is rotatably mounted on the transmission part. The transmission bevel gear includes a transmission shaft and third bevel gears mounted at both ends of the transmission shaft. The two third bevel gears mesh with the first bevel gear and the second bevel gear, respectively.

[0023] Preferably, the second bevel gear has a plurality of second sliders evenly distributed around its circumference, each corresponding to a plurality of grippers, and the grippers are provided with second grooves adapted to the second sliders.

[0024] Preferably, the end of the gripper closest to the axis of the power output end is provided with a clamping plate.

[0025] Preferably, the limiting pin is installed at the power output end and close to the transmission part.

[0026] Compared to the aforementioned background technology, the electric drill auxiliary device for operation in narrow spaces provided in this application has a transmission component whose position is adjusted by a positioning pin, so that the same power source can separately complete the adjustment of the clamping range of the clamping component and the driving of the clamping component's own rotation. This means that neither the adjustment of the clamping range of the clamping component nor the driving of the clamping component's own rotation requires manual operation, effectively solving the problems of existing wrenches with adjustment functions being unable to adapt to operation in narrow spaces and the inconvenience of clamp adjustment. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0028] Figure 1 This is a three-dimensional structural diagram of the electric drill auxiliary device applicable to operation in confined spaces, as described in this application.

[0029] Figure 2 This is a front cross-sectional view of the three-dimensional structure of the electric drill auxiliary device applicable to operation in confined spaces, as described in this application.

[0030] Figure 3 This is a three-dimensional structural diagram of the electric drill auxiliary device for operation in confined spaces according to this application, with the housing assembly removed.

[0031] Figure 4 This is a three-dimensional structural diagram illustrating the jaw mounting position relationship of the electric drill auxiliary device applicable to operation in confined spaces, as described in this application.

[0032] Figure 5 This is a three-dimensional structural diagram showing the installation position relationship between the limiting plate and the gripper of the electric drill auxiliary device applicable to operation in confined spaces, as presented in this application.

[0033] Figure 6 This is a three-dimensional structural diagram showing the installation position relationship between the second bevel gear and the gripper in the electric drill auxiliary device applicable to operation in confined spaces according to this application.

[0034] The components are as follows: 1. Housing assembly; 2. Limiting pin; 3. Clamp assembly; 4. Transmission assembly; 101. Power input end; 102. Transmission part; 103. Power output end; 104. Upper housing; 105. Lower housing; 5. Support column; 301. Limiting plate; 302. Gripper; 303. Clamping screw; 304. Limiting pin; 305. First slide groove; 306. First slider; 401. First bevel gear; 402. Second bevel gear; 403. Transmission bevel gear; 307. Second slider; 308. Second slide groove; 309. Clamping plate. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] It should be noted that the directional terms such as "upper end," "lower end," "left side," and "right side" used below are defined based on the accompanying drawings in the instruction manual.

[0038] The electric drill auxiliary device for operation in narrow spaces provided in this application mainly includes: housing assembly 1, clamp assembly 3 and transmission assembly 4.

[0039] The housing assembly 1 is provided with a movable limiting pin 2; the clamping assembly 3 is installed on the housing assembly 1, and the clamping range of the clamping assembly 3 is adjustable; the transmission assembly 4 is installed inside the housing assembly 1. When the limiting pin 2 is in contact with the clamping assembly 3, the transmission assembly 4 drives the clamping assembly 3 to adjust the clamping range. When the limiting pin 2 is not in contact with the clamping assembly 3, the transmission assembly 4 drives the clamping assembly 3 to rotate as a whole.

[0040] The limiting pin 2 installed on the housing assembly 1 functions as a clutch. When the transmission assembly 4 needs to adjust the clamping range of the clamping assembly 3, the limiting pin 2 is driven to contact the clamping assembly 3, thereby enabling the power transmitted by the transmission assembly 4 to directly adjust the clamping range of the clamping assembly 3.

[0041] When the transmission component 4 needs to drive the clamping component 3 to rotate, the reverse movement of the limit pin 2 makes the limit pin 2 no longer in contact with the clamping component 3, so that the transmission component 4 can directly drive the clamping component 3 to rotate, thereby realizing the rotation of the hexagonal nut or bolt.

[0042] In this invention, the transmission component 4 is adjusted by the position of the positioning pin, so that the same power source can respectively complete the adjustment of the clamping range of the clamping component 3 and the rotation of the clamping component 3 itself. This means that the adjustment of the clamping range of the clamping component 3 and the rotation of the clamping component 3 do not require manual operation, effectively solving the problems of existing wrenches with adjustment functions being unable to adapt to operation in narrow spaces and the inconvenience of clamp adjustment.

[0043] Based on any of the above embodiments, the housing assembly 1 is dumbbell-shaped and includes a power input end 101, a transmission part 102 and a power output end 103. Both the power input end 101 and the power output end 103 are tubular structures with hollow walls, and the transmission part 102 is also hollow.

[0044] The housing assembly 1 is designed in a dumbbell shape, with one end being a power input end 101 and the other end being a power output end 103. The power input end 101 and the power output end 103 are connected via a transmission part 102. The power input end 101 allows for direct and quick connection to an electric drill, facilitating power input. The power output end 103 is connected to the clamp assembly 3 to drive the clamp assembly 3 to rotate and adjust its clamping range.

[0045] Both the power input end 101 and the power output end 103 are tubular structures, which are intended to facilitate the power input of the power source, i.e., the electric drill, and to meet the rotation requirements of the clamp assembly 3 itself.

[0046] The tubular structure has a hollow wall to facilitate the installation of the transmission component 4. Similarly, the transmission part 102 has a hollow structure to meet the installation requirements of the transmission component 4 within the housing component 1.

[0047] Based on any of the above embodiments, the housing assembly 1 includes an upper housing 104 and a lower housing 105, which are connected by fixing bolts.

[0048] The housing assembly 1 consists of an upper housing 104 and a lower housing 105, and adopts a split design, which facilitates the installation of the internal transmission assembly 4 and clamping assembly 3, reducing assembly difficulty. At the same time, the split design can also effectively reduce production difficulty and production cost during the housing production process.

[0049] The upper housing 104 and the lower housing 105 are locked together by fixing bolts. Optionally, the upper housing 104 and the lower housing 105 are directly fastened together by detachable snap-fit. Optionally, the upper housing 104 and the lower housing 105 are fixed together by adhesive.

[0050] Based on any of the above embodiments, a support column 5 is installed on the power output end 103 of the upper housing 104, and a limiting pin 2 is slidably installed on the support column 5.

[0051] The introduction of support column 5 provides an installation base for the installation of limit pin 2. The axis of support column 5 is parallel to the axis of power output end 103, and the axis of limit pin 2 is perpendicular to the axis of support column 5.

[0052] The support column 5 has an installation through hole that matches the limit pin 2. The two ends of the limit pin 2 are provided with stops. After the limit pin 2 is inserted into the installation through hole, the stops prevent the limit pin 2 from sliding on the support column 5 and from disengaging from the support column 5.

[0053] The stop not only facilitates manual driving of the limit pin 2, but also ensures the positioning and installation of the limit pin 2.

[0054] Based on any of the above embodiments, the clamp assembly 3 includes:

[0055] The limiting plate 301 is a ring-shaped plate structure, and the limiting plate 301 is rotatably installed on the power output end 103 of the housing assembly 1;

[0056] The gripper 302 includes multiple grippers 302, which are evenly distributed around the circumference of the limiting plate 301, and the grippers 302 are slidably installed with the limiting plate 301.

[0057] The clamp screw ring 303 is rotatably mounted above the gripper 302. The clamp screw ring 303 is a ring-shaped plate structure and is coaxially mounted with the limiting plate 301. The upper end face of the gripper 302 is provided with a thread that is compatible with the clamp screw ring 303.

[0058] The limiting post 304 is installed on the upper end face of the clamp screw 303 and can contact the limiting pin 2.

[0059] The inner diameter of the ring-shaped limiting plate 301 is consistent with the inner diameter of the power output end 103. Multiple grippers 302 are evenly distributed on the limiting plate 301 and can slide synchronously along the radial direction of the limiting plate 301.

[0060] The upper end face of the gripper 302 is provided with threads, and a clamping ring 303, which is also annular plate-shaped, is installed on the upper end of the multiple grippers 302. The clamping ring 303 is an annular plate with threads on the lower end face. The upper thread on the lower end face of the clamping ring 303 is adapted to the threads on the upper end face of the multiple grippers 302, so that when the grippers 302 and the clamping ring 303 rotate relative to each other, the grippers 302 can be driven to move radially along the clamping ring 303.

[0061] The clamping screw 303 is rotatably mounted on the power output end 103. To reduce the rotational friction of the clamping screw 303 at the power output end, ball bearings are embedded on the outer circumference of the clamping screw 303. The inner diameter of the clamping screw 303 is consistent with the inner diameter of the power output end 103.

[0062] The limiting post 304 is installed on the upper end face of the clamp screw ring 303. When the limiting pin 2 moves close to the clamp screw ring 303, the limiting post 304 contacts the limiting pin 2 and limits each other.

[0063] The power input from the transmission unit 102 drives the limit plate 301 to rotate. After the limit plate 301 rotates, it drives multiple grippers 302 and clamp screw rings 303 to rotate. When the limit pin 2 moves close to the clamp screw ring 303, the clamp screw ring 303 drives the limit post 304 to approach the limit pin 2 and the limit post 304 is limited. At this time, the clamp screw ring 303 is limited.

[0064] The continuous power input causes the limiting plate 301 to rotate continuously. At this time, the clamp screw ring 303 is limited. The limiting plate 301 drives the jaw 302, so that the thread on the jaw 302 and the thread on the clamp screw ring 303 cooperate to realize the jaw 302 moving radially along the limiting plate 301.

[0065] When the limit pin 2 moves away from the clamp screw 303, the limit pin 2 does not contact the limit post 304. At this time, the power input drives the limit plate 301 to rotate and drives the gripper 302 and the clamp screw 303 to rotate synchronously. The weight of the clamp screw 303 itself, i.e. the frictional resistance between it and the housing assembly 1, is insufficient to achieve relative rotation between the gripper 302 and the clamp screw 303.

[0066] The clamping range of the clamping assembly 3 is adjusted by the threaded engagement between the clamping screw ring 303 and the jaw 302, which allows for stepless adjustment of the size of the clamping range adjustment component of the clamping assembly 3. Furthermore, the adjustment process uses the same power source as the rotation of the clamping assembly 3, eliminating the need for manual adjustment and fulfilling the purpose of operation in small spaces. At the same time, the clamping assembly 3 has a simple structure, stable transmission, is easy to operate, has low production cost, and is not easily damaged.

[0067] Based on any of the above embodiments, the limiting plate 301 is a split structure, which is composed of multiple arc-shaped plates. The two ends of the arc-shaped plates are provided with first sliding grooves 305, and the gripper 302 is provided with a first slider 306 that is adapted to the first sliding grooves 305.

[0068] By designing the limiting plate 301 as a split structure, that is, the limiting plate 301 is composed of multiple arc-shaped plates, with first sliding grooves 305 at both ends of the arc-shaped plates, and sliders adapted to the first sliding grooves 305 at both ends of the gripper 302, the gripper 302 can be slidably mounted on the arc-shaped plates. Since the limiting plate 301 is a split design, an annular mounting space is also provided at the power output end 103 to limit the limiting plate 301, ensuring that the appearance structure of the limiting plate 301 always maintains an annular plate structure.

[0069] The limiting plate 301, which adopts a split design, facilitates the processing of the first slide groove 305, as well as the installation of the gripper 302 and the driving of the transmission component 4.

[0070] Based on any of the above embodiments, the transmission assembly 4 includes:

[0071] The first bevel gear 401 is coaxially rotatably mounted on the power input end 101, and the first bevel gear 401 has a square hole in the middle.

[0072] The second bevel gear 402 is coaxially rotatably mounted on the power output end 103. The second bevel gear 402 is a ring structure adapted to the limiting plate 301.

[0073] The transmission bevel gear 403 is rotatably mounted on the transmission part 102. The transmission bevel gear 403 includes a transmission shaft and third bevel gears mounted at both ends of the transmission shaft. The two third bevel gears mesh with the first bevel gear 401 and the second bevel gear 402 respectively.

[0074] The first bevel gear 401 is a power input component, which is coaxially arranged with the power input end 101. The power input end 101 is provided with a mounting cavity and support member that is adapted to it. At the same time, the first bevel gear 401 and the sliding part of the power input end 101 are equipped with balls to reduce friction and reduce rotational resistance.

[0075] The square hole in the middle of the first bevel gear 401 is adapted to the square head drive rod of the electric drill. The square head drive rod of the electric drill can be directly inserted into the square hole to quickly input power from the electric drill as a power source to the transmission component.

[0076] The second main gear is a power output component, which is coaxially arranged with the power output end 103. The power output end 103 is provided with a mounting cavity and support that are adapted to it. Meanwhile, the sliding part of the second bevel gear 402 and the power output end 103 is equipped with balls to reduce friction and reduce rotational resistance.

[0077] The second bevel gear 402 is a ring plate structure, and its inner diameter is consistent with the inner diameter of the limiting plate 301. In the external appearance, the inner wall of the power output end 103 is consistent, with only the gripper 302 protruding.

[0078] The transmission bevel gear 403 is installed in the transmission part 102 and includes a transmission shaft and two third bevel gears that mesh with the first bevel gear 401 and the second bevel gear 402 respectively, so as to realize the transmission of power from the first bevel gear 401 to the second bevel gear 402. The transmission shaft is equipped with a bearing, which is fixed in the mounting part to reduce the transmission friction of the transmission shaft.

[0079] Based on any of the above embodiments, the second bevel gear 402 is provided with a plurality of second sliders 307 that correspond one-to-one with a plurality of grippers 302, and the grippers 302 are provided with second sliding grooves 308 that are adapted to the second sliders 307.

[0080] The limiting plate 301 is driven by a plurality of second sliders 307, which are evenly distributed around the upper end face of the second bevel gear 402 and correspond one-to-one with the gripper 302. The limiting plate 301 is designed as a split type, which is inconvenient for direct transmission. Furthermore, the gripper 302, as a clamping component, is subjected to a large force. The second sliders 307 and the second slide groove 308 cooperate to further limit the gripper 302, so that the gripper 302 can bear a larger load, and at the same time, it is convenient to directly drive the clamping assembly 3.

[0081] Based on any of the above embodiments, a clamping plate 309 is provided at one end of the gripper 302 near the axis of the power output end 103.

[0082] The final clamping component of the jaw 302 is an internal hex bolt or nut. Therefore, a clamping plate 309 is installed on the head of the jaw 302. The clamping plate 309 is made of hard alloy, which can effectively increase the service life of the jaw 302 and make it more secure and less likely to come off when clamping nuts or bolts.

[0083] Based on any of the above embodiments, the limiting pin 2 is installed at the power output end 103 and near the transmission part 102.

[0084] The limit pin 2 is driven directly by manual operation. Therefore, the design position of the limit pin 2 should facilitate manual operation. The limit pin 2 is set at the power output end 103 and close to the transmission part 102, which can meet the requirements of convenient manual operation and the purpose of convenient contact with the limit post 304.

[0085] In specific use, this invention is as follows:

[0086] When using this device, the worker holds a hand drill in one hand and this device in the other. The hand drill serves as the power component, and the device is quickly installed by engaging the square head transmission rod of the hand drill with the square hole on the first bevel gear 401.

[0087] After installation, place the power output end 103 into the narrow space and directly mount the tubular structure on the output end onto the nut or bolt. At this time, drive the limit pin 2 in the axial direction of the power output end 103.

[0088] When the power is turned on and the electric drill is input, the electric drill drives the first bevel gear 401 to rotate. The first bevel gear 401 drives the second bevel gear 402 to rotate via the transmission bevel gear 403. The second bevel gear 402 drives the chuck 302, the limiting plate 301, and the clamp screw 303 to rotate together. During the rotation, the limiting post 304 installed on the clamp screw 303 rotates with it and is limited after contacting the limiting pin 2. At this time, the clamp screw 303 stops rotating. The continuous input of power causes the limiting plate 301 and the chuck 302 to rotate continuously. During this process, the chuck 302 moves radially under the action of the thread of the clamp screw 303.

[0089] Adjust the rotation direction of the electric drill to adjust the radial movement direction of the chuck 302 to meet the tightening and loosening of the chuck 302.

[0090] After adjusting the clamping range of the jaws 302, turn off the electric drill and move the limit pin 2 away from the axis of the power output end 103. At this time, the limit pin 2 no longer contacts the limit post 304. Turn the electric drill back on to output power. The power is transmitted to the second bevel gear 402 through the first bevel gear 401 and the transmission bevel gear 403, which drives the multiple jaws 302, the limit plate 301 and the clamping screw ring 303 to rotate synchronously, thereby realizing the driving of the nut or bolt.

[0091] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0092] The above provides a detailed description of the electric drill auxiliary device suitable for operation in confined spaces provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the solution and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. An auxiliary device for electric drills suitable for operation in confined spaces, characterized in that, include: The housing assembly (1) is provided with a movable limiting pin (2). A clamping assembly (3) is mounted on the housing assembly (1), and the clamping range of the clamping assembly (3) is adjustable; The transmission assembly (4) is installed inside the housing assembly (1). When the limiting pin (2) is in contact with the clamp assembly (3), the transmission assembly (4) drives the clamp assembly (3) to adjust the clamping range. When the limiting pin (2) is not in contact with the clamp assembly (3), the transmission assembly (4) drives the clamp assembly (3) to rotate as a whole.

2. The auxiliary device for electric drills suitable for operation in confined spaces according to claim 1, characterized in that, The housing assembly (1) is dumbbell-shaped and includes a power input end (101), a transmission part (102) and a power output end (103). The power input end (101) and the power output end (103) are both tubular structures with hollow walls. The transmission part (102) is also a hollow structure.

3. The auxiliary device for electric drills suitable for operation in confined spaces according to claim 2, characterized in that, The housing assembly (1) includes an upper housing (104) and a lower housing (105), which are connected by fixing bolts.

4. The auxiliary device for electric drills suitable for operation in confined spaces according to claim 3, characterized in that, The power output end (103) of the upper housing (104) is equipped with a support column (5), and the limiting pin (2) is slidably mounted on the support column (5).

5. The auxiliary device for electric drills suitable for operation in confined spaces according to claim 4, characterized in that, The clamp assembly (3) includes: Limiting plate (301), the limiting is an annular plate structure, the limiting plate (301) is rotatably installed on the power output end (103) of the housing assembly (1). The gripper (302) includes multiple grippers (302), which are evenly distributed around the circumference of the limiting plate (301) and are slidably installed with the limiting plate (301); A clamping screw (303) is rotatably mounted above the gripper (302). The clamping screw (303) has an annular plate structure and is coaxially mounted with the limiting plate (301). The upper end face of the gripper (302) is provided with a thread that is compatible with the clamping screw (303). A limiting post (304) is installed on the upper end face of the clamp screw (303), and the limiting post (304) can contact the limiting pin (2).

6. The auxiliary device for electric drills suitable for operation in confined spaces according to claim 5, characterized in that, The limiting plate (301) is a split structure. The limiting plate (301) is composed of multiple arc plates. The two ends of the arc plates are provided with first sliding grooves (305). The gripper (302) is provided with a first slider (306) that is adapted to the first sliding grooves (305).

7. The auxiliary device for electric drills suitable for operation in confined spaces according to claim 6, characterized in that, The transmission assembly (4) includes: The first bevel gear (401) is coaxially rotatably mounted on the power input end (101), and the first bevel gear (401) has a square hole in the middle; The second bevel gear (402) is coaxially rotatably mounted on the power output end (103). The second bevel gear (402) is a ring structure adapted to the limiting plate (301). A transmission bevel gear (403) is rotatably mounted on the transmission unit (102). The transmission bevel gear (403) includes a transmission shaft and third bevel gears mounted at both ends of the transmission shaft. The two third bevel gears mesh with the first bevel gear (401) and the second bevel gear (402) respectively.

8. The auxiliary device for electric drills suitable for operation in confined spaces according to claim 7, characterized in that, The second bevel gear (402) has a plurality of second sliders (307) evenly distributed around its circumference, each corresponding to a plurality of grippers (302). The grippers (302) are provided with second grooves (308) adapted to the second sliders (307).

9. The auxiliary device for electric drills suitable for operation in confined spaces according to any one of claims 5-8, characterized in that, The gripper (302) has a clamping plate (309) at one end near the axis of the power output end (103).

10. The auxiliary device for electric drills suitable for operation in confined spaces according to any one of claims 2-8, characterized in that, The limiting pin (2) is installed at the power output end (103) and close to the transmission part (102).

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