Automatic wrench

Abstract

The utility model belongs to the technical field of wrenches, and particularly relates to an automatic wrench. The automatic wrench comprises a shell structure provided with a fixing groove; the sleeving structure comprises an adjusting assembly and a wrench rotating disc rotationally arranged in the fixing groove, the wrench rotating disc is provided with a wrench clamping groove, and the adjusting assembly comprises a pair of adjusting plates; the driving structure is connected with the shell structure and is used for driving the wrench turntable to rotate around the central axis of the wrench turntable; wherein the adjusting assembly has a first state and a second state; when the adjusting assembly is in the first state, the two adjusting plates are detachably connected with the two opposite inner walls of the spanner clamping groove correspondingly. And when the adjusting assembly is in the second state, the two adjusting plates are separated from the wrench turntable. The automatic wrench is at least suitable for nuts with two different diameters, the application range of the automatic wrench is widened, a plurality of automatic wrenches do not need to be carried, and the use convenience of the automatic wrench is improved.

Description

Technical Field

[0001] This utility model belongs to the field of wrench technology, and in particular relates to an automatic wrench. Background Technology

[0002] Wrenches are widely used in daily life, mainly for tightening or loosening screws or nuts. However, traditional open-end wrenches have some inconveniences. They are particularly unsuitable for confined spaces.

[0003] For example, industrial equipment typically features a dense array of nuts, such as the bolt and nut assemblies connecting pipe flanges, which usually have multiple nuts arranged in a dense circle around their circumference. Tightening or loosening these nuts is usually achieved using a manual open-end wrench. During operation, the nut is held in place by the wrench's slot, and then the nut is turned along a plane perpendicular to the nut's axis. Because the nuts are densely arranged, tightening can only be done frequently and intermittently with small-amplitude rotations in the same direction, which is time-consuming, labor-intensive, and inconvenient to operate.

[0004] At the same time, the size of the nuts on different flanges is also different, which requires carrying multiple wrenches, thus increasing the amount of tools to carry and making it inconvenient to use. Utility Model Content

[0005] The purpose of this application is to provide an automatic wrench, aiming to solve the problem of how to improve the ease of use of an automatic wrench.

[0006] To achieve the above objectives, the technical solution adopted in this application is: to provide an automatic wrench, comprising:

[0007] The shell structure has a fixing groove.

[0008] A socket structure includes an adjusting component and a wrench turntable rotatably disposed within the fixed groove. The wrench turntable has a wrench slot. The adjusting component includes a pair of adjusting plates.

[0009] A drive structure, connected to the housing structure and used to drive the wrench turntable to rotate about its central axis;

[0010] The adjustment component has a first state and a second state; when the adjustment component is in the first state, the two adjustment plates are detachably connected to the two opposing inner walls of the wrench slot; when the adjustment component is in the second state, the two adjustment plates are disconnected from the wrench turntable.

[0011] In some embodiments, the groove wall of the wrench slot is provided with a positioning groove, and the adjusting plate includes a plate body and a limiting part connected to the plate body; when the adjusting component is in the first state, the limiting part is engaged in the positioning groove to detachably connect the wrench turntable, and the plate body is in contact with the inner wall of the wrench slot.

[0012] In some embodiments, the positioning groove has a dovetail groove structure, and the shape of the limiting part is adapted to the shape of the positioning groove.

[0013] In some embodiments, the adjustment plates are provided in multiple pairs, with the thickness of the two plate bodies in the same pair being the same, and the thickness of the two plate bodies in different pairs being different.

[0014] In some embodiments, when the adjustment assembly is in a first state, a pair of adjustment plates are connected to the wrench dial.

[0015] In some embodiments, the housing structure has a receiving cavity, the fixing groove communicates with the receiving cavity, and the edge of the wrench turntable is at least partially located in the receiving cavity. The driving structure includes a rack disposed on the side surface of the wrench turntable, a gear set meshing with the rack and located in the receiving cavity, and a driving assembly connected to the housing structure and used to drive the gear set.

[0016] In some embodiments, the gear set includes a ratchet that meshes with the rack and a drive gear that meshes with the ratchet, both the ratchet and the drive gear being rotatably connected to the housing structure, and the drive assembly driving the drive gear.

[0017] In some embodiments, two ratchet wheels are arranged at intervals, and the rack engages at least one of the ratchet wheels.

[0018] In some embodiments, the drive assembly includes a driven pulley connected to the gear assembly, a timing belt, a driver, and a driving pulley connected to the driver, wherein the two ends of the timing belt are respectively connected to the driving pulley and the driven pulley.

[0019] In some embodiments, the drive assembly further includes a battery connected to the housing structure and used to power the drive.

[0020] The beneficial effects of this application are as follows: the automatic wrench includes a housing structure, a socket structure, and a drive structure. The socket structure is at least partially located in the fixed groove, and the wrench slot on the wrench turntable can engage the nut. Under the drive of the drive structure, the nut is rotated. The rotation process can tighten or loosen the nut. The adjustment component can switch between a first state and a second state, so that the automatic wrench can be adapted to at least two different diameter nuts, which improves the application range of the automatic wrench. Therefore, it is not necessary to carry multiple automatic wrenches, which improves the convenience of using the automatic wrench. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or exemplary technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional structural diagram of the automatic wrench provided in the embodiment of this application, with the adjustment component in a first state;

[0023] Figure 2 This is a three-dimensional structural diagram of an automatic wrench with the adjustment component in a second state, provided in another embodiment of this application;

[0024] Figure 3 This is a three-dimensional structural schematic diagram of an automatic wrench provided in another embodiment of this application;

[0025] Figure 4 yes Figure 1 An explosion diagram of an automatic wrench;

[0026] Figure 5 yes Figure 4 A three-dimensional structural diagram of the adjustment plate in the middle;

[0027] Figure 6 yes Figure 1 A cross-sectional view of an automatic wrench.

[0028] The following are the labeling elements in the figure:

[0029] 100. Automatic wrench; 200. Socket structure; 201. Wrench turntable; 202. Adjustment component; 203. Wrench slot; 403. Fixing slot; 400. Housing structure; 401. Cover plate; 402. Bottom shell; 300. Drive structure; 303. Drive component; 301. Rack; 302. Gear set; 3021. Drive gear; 3022. Ratchet; 3023. Driven rotating shaft; 3024. Driven rotating shaft; 101. Guide rail; 1011. Clearance notch; 2021. Adjustment plate; 3031. Drive box; 3032. Drive wheel; 3033. Synchronous belt; 3034. Driven wheel; 404. Receiving cavity; 204. Positioning slot; 2022. Plate body; 2023. Limiting part; 110. Nut. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0031] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly or indirectly attached to that other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," etc., indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, and are for ease of description only, not to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "A plurality" means two or more, unless otherwise explicitly defined.

[0032] Please see Figures 1 to 3 This application provides an automatic wrench 100, which can be used to tighten or loosen a nut 110 threaded onto a bolt, or to tighten or loosen a bolt threaded into a threaded hole. In this embodiment, the automatic wrench 100 is used to tighten or loosen the nut 110. In other embodiments, the appropriate method can be selected according to the actual situation, and no limitation is made here. It can also be understood that the automatic wrench 100 can also rotate other objects.

[0033] Please see Figures 1 to 4 The automatic wrench 100 includes a housing structure 400, a socket structure 200, and a drive structure 300.

[0034] Please see Figures 1 to 4 The housing structure 400 has a fixing groove 403. The housing structure 400 can be made of plastic. The plastic material can be injection molded into the housing structure 400 through injection molding process. The fixing groove 403 is located at one end of the housing structure 400, and the other end of the housing structure 400 is used for hand gripping to operate the automatic wrench 100.

[0035] The socket structure 200 includes an adjustment component 202 and a wrench turntable 201 rotatably disposed within a fixed groove 403. The wrench turntable 201 has a wrench slot 203. The adjustment component 202 includes a pair of adjustment plates 2021, one of which includes two adjustment plates 2021. The automatic wrench 100 can engage the nut 110 within the wrench slot 203, such that the opposite two surfaces of the nut 110 are respectively positioned relative to the two side walls of the wrench slot 203, and the central axis of the nut 110 coincides with the central axis of the wrench turntable 201. The wrench turntable 201 can rotate around its own central axis under the drive of torque, and during the rotation of the wrench turntable 201, it drives the nut 110 to rotate.

[0036] Please see Figures 1 to 4 The drive structure 300 connects to the housing structure 400 and is used to drive the wrench turntable 201 to rotate around its central axis. It can be understood that the drive structure 300 can be an electrically powered drive structure 300, which can drive the wrench turntable 201 to rotate through gear transmission, belt transmission or chain transmission. There is no restriction here, and the choice can be made according to the actual situation.

[0037] Please see Figures 1 to 4 The adjusting component 202 has a first state and a second state. When the adjusting component 202 is in the first state, the two adjusting plates 2021 are detachably connected to the two opposing inner walls of the wrench slot 203, thereby reducing the width of the wrench slot 203 and making it suitable for nuts 110 with smaller diameters. When the adjusting component 202 is in the second state, the two adjusting plates 2021 are disconnected from the wrench turntable 201, thereby increasing the width of the wrench slot 203 compared to the first state and making it suitable for nuts 110 with larger diameters. By switching the adjusting component 202 between the first and second states, the automatic wrench 100 can be adapted to at least two different diameter nuts 110, improving the application range of the automatic wrench 100, eliminating the need to carry more automatic wrenches 100, and improving the convenience of use.

[0038] The automatic wrench 100 provided in this application embodiment includes a housing structure 400, a socket structure 200, and a drive structure 300. The socket structure 200 is at least partially located in the fixing groove 403, and the wrench slot 203 on the wrench turntable 201 can engage the nut 110. Under the drive of the drive structure 300, the nut 110 is rotated. The rotation process can be to tighten or loosen the nut 110. The adjustment component 202 can switch between a first state and a second state, so that the automatic wrench 100 can be adapted to at least two different diameter nuts 110, thereby improving the application range of the automatic wrench 100 and eliminating the need to carry multiple automatic wrenches 100, thus improving the convenience of using the automatic wrench 100.

[0039] It is understood that the wrench slot 203 can be a closed structure or an open structure. In this application, the wrench slot 203 is an open structure, and its opening coincides with the opening of the fixing slot 403, so that the nut 110 can easily enter the wrench slot 203. In other embodiments, the choice can be made according to the actual situation, and no restrictions are imposed here.

[0040] Please see Figures 4 to 5 In some embodiments, the groove wall of the wrench slot 203 is provided with a positioning groove 204, and the adjusting plate 2021 includes a plate body 2022 and a limiting part 2023 connecting the plate body 2022; when the adjusting component 202 is in the first state, the limiting part 2023 is engaged in the positioning groove 204 to detachably connect the wrench turntable 201 to the wrench slot 203, and the plate body 2022 fits against the inner wall of the wrench slot 203.

[0041] Please see Figures 4 to 5 It is understandable that when the adjusting component 202 is in the first state, the two side surfaces of the plate body 2022 abut against the groove wall of the wrench slot 203 and the side surface of the nut 110, respectively. Positioning grooves 204 are provided on the opposite side groove walls of the wrench slot 203. The two adjusting plates 2021 are detachably connected to the wrench turntable 201 through the two positioning grooves 204. The positioning grooves 204 can position the limiting part 2023, ensuring that the adjusting plate 2021 remains stable during the rotation of the wrench turntable 201, thereby stably driving the nut 110 to rotate.

[0042] In some embodiments, the positioning wrench slot 203 has a dovetail groove structure, and the shape of the limiting part 2023 is adapted to the shape of the wrench slot 203.

[0043] Please see Figures 4 to 5Optionally, the positioning groove 204 extends to the opening of the wrench slot 203, so that the adjusting plate 2021 can be inserted from the opening of the wrench slot 203, while the limiting part 2023 is locked in the positioning groove 204. Conversely, the adjusting plate 2021 can be removed from the wrench slot 203, which improves the convenience of installing or removing the adjusting plate 2021.

[0044] Please see Figures 4 to 5 In some embodiments, the adjustment plate 2021 is provided in multiple pairs, with the thickness of the two plate bodies 2022 in the same pair being the same, and the thickness of the two plate bodies 2022 in different pairs being different.

[0045] Please see Figures 4 to 5 It is understandable that for nuts 110 of different diameters, a corresponding pair of adjusting plates 2021 can be selected. After the two adjusting plates 2021 are installed on the wrench turntable 201, the distance between the two plate bodies 2022 is adapted to the diameter of the nut 110 that needs to be tightened. When the nut 110 is located in the wrench slot 203, the two plate bodies 2022 respectively abut against the opposite side surfaces of the nut 110, which improves the convenience of use and the application range of the automatic wrench 100.

[0046] In some embodiments, when the adjustment assembly 202 is in a first state, a pair of adjustment plates 2021 are connected to a wrench turntable 201.

[0047] Please see Figures 4 to 5 It is understood that the thickness of the plate body 2022 of the same pair of adjusting plates 2021 is the same, so that the central axis of the nut 110 coincides with the central axis of the wrench turntable 201. In some embodiments, when the nut 110 is asymmetrical about its central axis, or when the automatic wrench 100 is turning an object asymmetrical about its central axis, two adjusting plates 2021 with different plate body thicknesses can be selected. So that after the nut 110 or the object is in the wrench slot 203, the two plate bodies 2022 with different thicknesses can correct the position of its central axis, so that the central axis of the nut 110 or the object always coincides with the central axis of the wrench turntable 201, which improves the convenience of use.

[0048] Optionally, the plate body 2022 is also provided with a guide surface to guide the nut 110 into the wrench slot 203.

[0049] Please see Figures 4 to 5In some embodiments, the housing structure 400 has a receiving cavity 404, a fixing groove 403 communicating with the receiving cavity 404, and the edge of the wrench turntable 201 is at least partially located in the receiving cavity 404. The drive structure 300 includes a rack 301 arranged on the side surface of the wrench turntable 201, a gear set 302 meshing with the rack 301 and located in the receiving cavity 404, and a drive assembly 303 connecting the housing structure 400 and used to drive the gear set 302.

[0050] It is understandable that the rack 301 is an irregular rack 301, that is, an arc-shaped rack 301 extending circumferentially along the wrench turntable 201. It is understandable that the gear set 302 can transmit the rotational power of the drive assembly 303 to the rack 301.

[0051] Please see Figures 4 to 5 Optionally, two guide rails 101 are arranged opposite each other inside the receiving cavity 404. The two guide rails 101 are located on two opposite inner walls of the receiving cavity 404, and the material of the guide rails 101 can be metal, such as stainless steel. The guide rails 101 are provided with clearance notches 1011 at the opening of the wrench slot 203. The rack 301 is slidably engaged between the two guide rails 101 to reduce the friction of the rack 301, thereby facilitating the drive assembly 303 to drive the wrench turntable 201 to rotate through the rack 301.

[0052] Please see Figures 1 to 4 Optionally, the shell structure 400 includes a bottom shell 402 and a cover plate 401 that covers the bottom shell 402. Two guide rails 101 connect the bottom shell 402 and the cover plate 401 respectively, and the bottom shell 402 and the cover plate 401 together form an accommodating cavity 404. The fixing groove 403 is partially located in the bottom shell 402 and partially located in the cover plate 401.

[0053] Please see Figures 1 to 4 In some embodiments, the gear set 302 includes a ratchet 3022 that meshes with the rack 301 and a drive gear 3021 that meshes with the ratchet 3022. Both the ratchet 3022 and the drive gear 3021 are rotatably connected to the housing structure 400, and the drive assembly 303 drives the drive gear 3021.

[0054] Optionally, the diameter of the drive gear 3021 is larger than the diameter of the ratchet 3022, thereby creating a larger transmission ratio between the drive gear 3021 and the ratchet 3022 to generate a larger torque on the nut 110, which can loosen or tighten the nut 110.

[0055] In some embodiments, two ratchet wheels 3022 are arranged at intervals, and the rack 301 engages at least one of the ratchet wheels 3022.

[0056] Please see Figures 1 to 4Optionally, by providing two ratchet wheels 3022, the torque transmitted to the rack 301 can be increased. The two ratchet wheels 3022 are spaced apart, allowing rotation within a smaller space in the receiving cavity 404. The two ratchet wheels 3022 can increase the tightening force of the automatic wrench 100, thus meeting the needs of situations where the preload of the nut 110 is relatively large. Therefore, in some situations requiring a large preload, such as changing a car tire, the automatic wrench 100 can also be used.

[0057] Please see Figures 1 to 4 Optionally, the drive gear 3021 and ratchet 3022 can be rotatably connected to the inner wall of the accommodating cavity 404 via bearings. For example, the drive gear 3021 is mounted on the driving rotation shaft 3023, and the ratchet 3022 is mounted on the driven rotation shaft 3024. Bearings are provided at both ends of the driving rotation shaft 3023 and at both ends of the driven rotation shaft 3024, thereby enabling the rotation of the drive gear 3021 and the ratchet 3022.

[0058] It is understandable that both ends of the active rotating shaft 3023 and the driven rotating shaft 3024 are rotatably connected to the bottom shell 402 and the cover plate 401, respectively.

[0059] Please see Figure 6 In some embodiments, the drive assembly 303 includes a driven pulley 3034 connected to the gear set 302, a timing belt 3033, a driver, and a drive pulley 3032 connected to the driver. The two ends of the timing belt 3033 are respectively connected to the drive pulley 3032 and the driven pulley 3034.

[0060] Optionally, the driver can be a servo motor, the driven wheel 3034 is detachably connected to the active rotating shaft 3023, the active wheel 3032 is set on the output shaft of the motor, and the rotational power of the motor can be transmitted to the drive gear 3021 through the synchronous belt 3033, thereby causing the drive gear 3021 to drive the wrench turntable 201 to rotate.

[0061] Please see Figure 6 Optionally, power can be transmitted via a synchronous belt 3033, which has the following characteristics:

[0062] Precise Transmission: The synchronous belt 3033 drive achieves highly precise transmission through the cooperation of the driving pulley 3032, the driven pulley 3034, and the synchronous belt 3033. Because the gears on the synchronous belt 3033 mesh well with the tooth grooves on the driving pulley 3032 and the driven pulley 3034, power can be transmitted accurately, avoiding transmission errors caused by slippage in traditional belt drives.

[0063] Low noise: Because there is no slippage in the 3033 synchronous belt drive, the noise is relatively low. Compared with friction drives, their operation is smoother and quieter.

[0064] High efficiency: Synchronous belt 3033 drives typically have high transmission efficiency because the combination of gears and synchronous belt 3033 reduces energy loss and improves transmission efficiency.

[0065] No lubrication required: Compared to chain drives, the 3033 synchronous belt drive requires no lubrication. This simplifies the maintenance process and reduces the maintenance costs of the drive system.

[0066] Suitable for high loads: The 3033 synchronous belt drive can withstand high loads.

[0067] High reliability: Due to the relatively simple structure of the 3033 synchronous belt drive and the fact that it is not prone to problems such as loosening or skipping teeth, it has high reliability and stability.

[0068] In some embodiments, the drive assembly 303 further includes a battery connected to the housing structure 400 and used to power the drive.

[0069] Optionally, the battery is a lithium battery, which allows for repeated charging and discharging.

[0070] Optionally, the drive assembly 303 also includes a drive box 3031 connected to the housing structure 400, and the drive wheel 3032, driven wheel 3034 and timing belt 3033 are all located inside the drive box 3031.

[0071] Please see Figures 1 to 3 The following describes the operation process of the automatic wrench 100, taking into account its structure:

[0072] Taking the hexagonal nut 110 as an example, when using the automatic wrench 100 of this application, the wrench slot 203 is also hexagonal in shape. If the nut 110 is screwed onto a shorter screw, the wrench slot 203 of the wrench turntable 201 can be directly snapped onto the nut 110 from top to bottom. At this time, the opening of the wrench slot 203 may not coincide with the opening of the fixing groove 403. Then, the working state of the driver is controlled, that is, the driver is controlled to rotate forward or backward to tighten or loosen the nut 110; if the nut 110 is screwed onto a shorter screw, the wrench slot 203 of the automatic wrench 100 is directly snapped onto the nut 110 from top to bottom. 10. When the screw is screwed onto a relatively long screw or the wrench slot 203 cannot be directly fastened onto the nut 110, the opening of the wrench slot 203 can be adjusted to coincide with the opening of the fixing slot 403. Then, the screw is inserted into the wrench slot 203 from the opening of the wrench slot 203. Then, the automatic wrench 100 moves along the axis of the screw to fasten the wrench slot 203 onto the corresponding nut 110. Finally, the working state of the control driver is operated to tighten or loosen the nut 110.

[0073] In addition, since the hexagonal nuts 110 come in various specifications with different diameters, for ease of use, the ratchet 3022, wrench turntable 201, and housing structure 400 can be combined into one unit. The drive assembly 303 can be detachably connected to the housing structure 400. The drive assembly 303 and the housing structure 400 are detachably connected, so that one drive assembly 303 can control multiple housing structures 400 with different drive gears 3021 and wrench turntables 201. This allows for replacement according to the specifications of the nuts 110 to meet usage requirements.

[0074] The above are merely optional embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. An automatic wrench, characterized in that, include: The shell structure has a fixing groove. A socket structure includes an adjusting component and a wrench turntable rotatably disposed within the fixed groove. The wrench turntable has a wrench slot. The adjusting component includes a pair of adjusting plates. A drive structure, connected to the housing structure and used to drive the wrench turntable to rotate about its central axis; The adjustment component has a first state and a second state; when the adjustment component is in the first state, the two adjustment plates are detachably connected to the two opposing inner walls of the wrench slot; when the adjustment component is in the second state, the two adjustment plates are disconnected from the wrench turntable.

2. The automatic wrench as described in claim 1, characterized in that: The groove wall of the wrench slot is provided with a positioning groove, and the adjusting plate includes a plate body and a limiting part connected to the plate body; when the adjusting component is in the first state, the limiting part is engaged in the positioning groove to detachably connect the wrench turntable, and the plate body is in contact with the inner wall of the wrench slot.

3. The automatic wrench as described in claim 2, characterized in that: The positioning groove has a dovetail groove structure, and the shape of the limiting part is adapted to the shape of the positioning groove.

4. The automatic wrench as described in claim 2, characterized in that: The adjustment plates are arranged in multiple pairs. The thickness of the two plates in the same pair is the same, and the thickness of the two plates in different pairs is different.

5. The automatic wrench as described in claim 4, characterized in that: When the adjustment assembly is in the first state, one pair of the adjustment plates is connected to the wrench turntable.

6. The automatic wrench as described in any one of claims 1-5, characterized in that: The housing structure has a receiving cavity, the fixing groove communicates with the receiving cavity, and the edge of the wrench turntable is at least partially located in the receiving cavity. The driving structure includes a rack arranged on the side surface of the wrench turntable, a gear set meshing with the rack and located in the receiving cavity, and a driving assembly connected to the housing structure and used to drive the gear set.

7. The automatic wrench as described in claim 6, characterized in that: The gear set includes a ratchet that meshes with the rack and a drive gear that meshes with the ratchet. Both the ratchet and the drive gear are rotatably connected to the housing structure, and the drive assembly drives the drive gear.

8. The automatic wrench as described in claim 7, characterized in that: Two ratchet wheels are arranged at intervals, and the rack engages at least one of the ratchet wheels.

9. The automatic wrench as described in claim 6, characterized in that: The drive assembly includes a driven pulley connected to the gear assembly, a timing belt, a driver, and a driving pulley connected to the driver. The two ends of the timing belt are respectively connected to the driving pulley and the driven pulley.

10. The automatic wrench as described in claim 9, characterized in that: The drive assembly also includes a battery connected to the housing structure and used to power the drive.

Images