Quick-mounting compact explosion-proof electric wrench

Abstract

The utility model relates to electric tool technical field, especially a kind of compact explosion-proof electric wrench of quick-mounting, including combined shell and explosion-proof inner shell, explosion-proof inner shell includes motor bin, threading bin and battery bin;DC brushless motor is equipped in motor bin, including stator assembly and rotor assembly, stator assembly fixedly connected explosion-proof inner shell, motor rotating shaft front end connection reduction gearbox in rotor assembly, reduction gearbox front end connection torque transmission mechanism, reduction gearbox and torque transmission mechanism outside are equipped with nose shell, explosion-proof inner shell front end connection nose shell, rear end covers explosion-proof rear cover;Speed regulation mechanism is installed in threading bin, battery mechanism is installed in battery bin, battery bin bottom end covers explosion-proof bottom plate;Battery mechanism includes battery pack, controller board is fixed with battery bin by fixed plate, battery pack electric connection controller board, DC brushless motor and speed regulation mechanism.The utility model can effectively solve the technical problems, such as the complexity of traditional electric wrench assembly, low transmission efficiency, high cost and poor explosion-proof performance.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, and in particular to a quick-release, compact, explosion-proof electric wrench. Background Technology

[0002] In industrial production and special operating environments, especially in flammable and explosive locations such as coal mines, oil fields, chemical plants, and natural gas processing plants, the safety and reliability of equipment are of extremely high importance. Electric wrenches often generate sparks during use due to friction and impact, and the internal motors or batteries are prone to overheating and short circuits, which can easily lead to fires or even explosions, posing a significant threat to personnel safety and production facilities. Currently, most electric wrenches on the market suffer from complex assembly, low transmission efficiency, high cost, and insufficient explosion-proof performance, making them unsuitable for the needs of industrial production. Utility Model Content

[0003] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a quick-installation, compact explosion-proof electric wrench that is simple and convenient to assemble, has high transmission efficiency, large torque output, is easy to use, and has high safety performance. This utility model can effectively solve the technical problems of traditional electric wrenches, such as complex assembly, low transmission efficiency, high production cost, and poor explosion-proof performance.

[0004] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: One technical solution of this utility model provides a quick-installation compact explosion-proof electric wrench, which includes a combined outer shell and a hollow explosion-proof inner shell. The explosion-proof inner shell is provided with a motor compartment, a wiring compartment and a battery compartment from top to bottom. The motor compartment is equipped with a brushless DC motor, which includes a stator assembly and a rotor assembly movably fitted inside the stator assembly. The stator assembly is fixedly connected to the inner wall of the explosion-proof inner shell. The rotor assembly includes a motor shaft that passes through the explosion-proof inner shell. The front end of the motor shaft extends out of the explosion-proof inner shell and is connected to a gearbox. The front end of the gearbox is connected to a torque transmission mechanism. A head shell is fitted around the gearbox and the torque transmission mechanism. The front opening of the explosion-proof inner shell is fixedly connected to the head shell, and the rear opening of the explosion-proof inner shell is covered with an explosion-proof rear cover. The wiring compartment is equipped with a speed regulating mechanism to adjust the speed of the brushless DC motor and control the output torque of the impact wrench. The battery compartment is equipped with a battery mechanism, and the bottom opening of the battery compartment is covered with an explosion-proof bottom plate. The battery mechanism includes a battery pack and a controller board. The controller board is fixed inside the battery compartment by a fixing plate. The battery pack is located below the fixing plate. The battery pack is electrically connected to the controller board, the DC brushless motor, and the speed regulation mechanism.

[0005] By adopting the above technical solution, the stator assembly of the brushless DC motor is directly fixed to the explosion-proof inner shell before assembling the rotor assembly. Compared with the traditional method of fixing the entire brushless DC motor to the explosion-proof inner shell using fixing plates and other mechanisms, this significantly saves internal assembly space in the motor compartment. It also improves concentricity during motor transmission, simplifies assembly steps, increases transmission efficiency, ensures high torque output, and provides convenient and safe operation. The explosion-proof inner shell isolates electrical components prone to short-circuit sparks or explosions from the external mine environment, achieving self-explosion protection and preventing dangerous situations such as fires and explosions caused by circuit failures or explosions within the mine. During operation, powered by a battery mechanism, the brushless DC motor drives the motor shaft, which in turn drives the gearbox and torque transmission mechanism. The motor torque is multiplied and output to the power output shaft of the torque transmission mechanism. The speed regulation mechanism adjusts the output torque, thereby facilitating the installation and removal of bolts or nuts.

[0006] In some possible implementations, the front end of the motor compartment is provided with a limiting platform integrally formed with the explosion-proof inner shell. The limiting platform abuts against the front end of the stator assembly. The limiting platform has at least two limiting holes around its circumference. The rear end of the stator assembly is pressed with an annular stator pressure ring. The inner diameter of the stator pressure ring is smaller than the outer diameter of the stator assembly. A limiting bolt passes through the stator pressure ring and the limiting holes. The limiting bolt is located on the outer ring of the stator assembly, thereby fixing the stator assembly in the motor compartment of the explosion-proof inner shell. Unlike traditional brushless DC motors that are fixed in the explosion-proof inner shell by a motor mounting plate, this solution can first fix and assemble the stator assembly in the explosion-proof inner shell, and then assemble the rotor assembly. This not only improves the assembly stability of the motor and reduces the space occupied by the brushless DC motor, saving costs, but also improves the concentricity of the motor installation and increases the transmission efficiency of the electric wrench.

[0007] In some possible implementations, the rear end of the motor shaft extends out of the explosion-proof back cover and is connected to a synchronously rotating first cooling fan. The first cooling fan is located between the combined housing and the explosion-proof back cover. The rear end of the motor shaft is also fitted with a synchronously rotating second cooling fan. The second cooling fan is located between the explosion-proof back cover and the stator assembly. During operation, the first cooling fan and the second cooling fan respectively dissipate heat and cool the inside of the motor and the housing.

[0008] In some possible implementations, the gearbox includes a gear ring fixedly connected to a combined housing, the inner ring of the gear ring being meshed with three planetary gears, the torque transmission mechanism including a power shaft, the rear end of the power shaft being provided with a planetary chuck, the three planetary gears being embedded in the planetary chuck, and the front end of the motor shaft being sleeved in the planetary chuck and meshing with the three planetary gears respectively. The connection points between the motor shaft and the planetary chuck, between the planetary chuck and the explosion-proof inner shell, and between the motor shaft and the explosion-proof inner shell are respectively fitted with bearings with interference fits. The through-hole connections between the explosion-proof inner shell and the motor shaft, and between the motor shaft and the explosion-proof rear cover, are fitted with copper sleeves with interference fits. The bearings ensure concentricity, reduce friction and wear at rotating connection points, and improve the rotational flexibility of the contact points. The copper sleeves ensure concentric stability while preventing sparks from collisions between rotating parts, thus reducing the risk of explosion.

[0009] The above solution uses a brushless DC motor to drive the motor shaft to rotate. The motor shaft drives three planetary gears to rotate around their own axes through gear transmission. By setting three planetary gears, the stability of torque transmission is improved. The three planetary gears rotate along the inside of the gear ring, and at the same time drive the power shaft to rotate synchronously around its own axis. This transmits the speed of the motor shaft to the power shaft at the required reduction ratio, thereby improving the output torque of the power shaft.

[0010] In some possible implementations, the combined housing includes a first housing and a second housing that are detachably and fixedly connected. The first housing and the second housing are fitted over the outside of the head housing and the explosion-proof inner housing and are fixedly connected to the head housing and the explosion-proof inner housing. The inner side of the rear opening end of the head housing is provided with at least two limiting grooves, and the outer circumferential side of the gear ring is provided with radially protruding limiting blocks. The gear ring is fitted inside the rear opening end of the head housing, and the limiting blocks are embedded in the limiting grooves one by one, thereby fixing the gear ring to the head housing. This ensures that the gear ring remains stationary when the planetary gear rotates along the gear ring, and the concentricity of the motor shaft and the power shaft during gearbox operation can be improved by the limiting blocks being embedded in the limiting grooves.

[0011] In some possible implementations, the speed control mechanism includes a connected signal switch and a speed control button. A switch bracket is fixed inside the cable tray. The signal switch is fixedly connected to the switch bracket via a mounting bracket. A T-shaped threaded ring is fitted around the speed control button, which is inserted and fixed within the combined outer shell and the explosion-proof inner shell. The speed control button can extend and retract within the T-shaped threaded ring. The motor speed can be changed in real time by manually pressing the speed control button to control the pressing amplitude, thereby achieving flexible control of the electric wrench's output torque.

[0012] In some possible implementations, a battery unlocking mechanism is provided between the battery compartment and the battery pack. The battery unlocking mechanism includes a latch, a limiting pin, and an unlocking button. One end of the latch has an opening groove, and the other end has a protruding locking block. The middle part of the latch is pivotally connected to the battery compartment through a limiting pin, which is fixedly connected to the inner wall of the battery compartment. An unlocking hole is provided on the side of the battery compartment, and the unlocking button passes through the unlocking hole. The end of the unlocking button is vertically embedded in the opening groove, and a spring abuts against the unlocking button and the opening groove. A locking groove is provided on the side of the battery pack, and the locking block corresponds to the locking groove. When the battery pack is installed inside the battery compartment, the locking block is locked inside the locking groove.

[0013] When the battery pack needs to be removed, press the unlock button to push one end of the latch's slot inward. The pivoting action of the limiting pin will disengage one end of the locking block from the slot, thus removing the battery pack from the battery compartment. When installing the battery pack, simply push the battery pack into the battery compartment and slide it along the wedge-shaped surface of the locking block until the locking block is finally inserted into the slot, fixing the battery pack in place and preventing it from coming loose.

[0014] In some possible implementations, an external charging port is provided on the side of the battery compartment. A DC female connector and a threaded cover are installed inside the external charging port. The DC female connector is electrically connected to the battery pack and the controller board, and the threaded cover is threaded to the opening end of the external charging port.

[0015] In some possible implementations, a handle groove is provided on the bottom side of the battery pack adjacent to the explosion-proof base plate, and a handle ring is hinged in the handle groove. The battery pack is provided with an internal charging port. The battery pack can be taken out of the battery compartment through the handle groove, and the internal charging port is connected to an external charger to charge the battery pack.

[0016] The explosion-proof electric wrench provided by the above solution can be charged by connecting to an external charger via a DC female connector, or the battery pack can be removed from the battery compartment for independent charging, which can meet different charging needs.

[0017] In some possible implementations, the side of the battery compartment has an adjustment hole, and a button plate electrically connected to the controller board is vertically fixed on the fixing plate. An adjustment button is inserted into the adjustment hole, with one end of the adjustment button extending out of the battery compartment and the other end perpendicularly abutting against the button plate. By pressing the adjustment button, the output torque of the electric wrench can be adjusted, limiting the maximum output torque at each gear.

[0018] This utility model has the following beneficial effects: This utility model provides a quick-installation compact explosion-proof electric wrench with a separate DC brushless motor. The stator assembly can be packaged and shipped with the explosion-proof inner shell, while the rotor assembly can be assembled separately. Assembly is simple and convenient, saving internal assembly space in the motor compartment, improving concentricity during motor transmission, increasing transmission efficiency, ensuring high torque output, and offering ease of use and high safety performance. The explosion-proof inner shell isolates electrical components that are prone to short-circuit sparks or explosions from the external mine environment, achieving its own explosion-proof effect and preventing dangerous situations such as fires and explosions caused by circuit failures or explosions within the mine. The battery pack is detachably installed inside the explosion-proof inner shell, allowing it to be charged by connecting the electric wrench to a charger or removed for separate charging. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a three-dimensional structural diagram of the quick-release compact explosion-proof electric wrench of this utility model; Figure 2 This is an exploded structural diagram of a quick-release, compact, explosion-proof electric wrench; Figure 3 This is a rear view of a quick-release, compact, explosion-proof electric wrench; Figure 4 yes Figure 3 Cross-sectional view of the internal structure along line "AA" in the middle; Figure 5 yes Figure 3 Cross-sectional view along line "BB" in the middle; Figure 6 This is a schematic diagram of the internal cross-sectional structure of the gearbox; Figure 7 This is a schematic diagram of the internal cross-sectional structure of another type of gearbox; Figure 8 This is a schematic diagram of the internal cross-sectional structure of the battery unlocking mechanism; Figure 9 This is a schematic diagram showing the connection between the battery pack and the battery unlocking mechanism; Figure 10 This is a schematic diagram showing the positions of the handle groove and handle ring in the battery pack.

[0020] Explanation of the labels in the diagram: 1. Modular outer shell; 11. First shell; 12. Second shell; 2. Explosion-proof inner shell; 21. Motor compartment; 211. Limiting platform; 212. Limiting hole; 213. Limiting bolt; 22. Wiring compartment; 23. Battery compartment; 231. Unlocking hole; 232. External charging port; 233. Threaded cover; 234. Gear adjustment hole; 235. Button panel; 236. Gear adjustment button; 24. Explosion-proof rear cover; 25. Explosion-proof base plate; 26. Battery unlocking mechanism; 261. Lock; 2611. Opening slot; 2612. Locking block; 2613. Spring; 262. Limiting pin; 263. Unlocking button; 3. DC brushless motor; 31. Stator assembly; 32. Rotor assembly; 321. Motor shaft; 322. Bearing; 323. Copper bushing; 33. Stator pressure ring; 4. Gearbox; 41. Gear ring; 411. Limit block; 42. Planetary gear; 5. Torque transmission mechanism; 51. Drive shaft; 511. Planetary chuck; 6. Head housing; 61. Limiting groove; 7. Speed ​​control mechanism; 71. Signal switch; 72. Speed ​​control button; 73. Switch bracket; 74. Card holder; 75. T-shaped threaded ring; 8. Battery mechanism; 81. Battery pack; 811. Card slot; 812. Handle slot; 813. Handle ring; 814. Internal charging port; 82. Controller board; 83. Fixing plate; 84. DC female connector; 9. First cooling fan; 10. Second cooling fan. Detailed Implementation

[0021] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be introduced in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment.

[0022] In the description of this embodiment, it should be noted that the terms "upper," "lower," "left," "right," "inner," "outer," "top," "bottom," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to has a specific orientation, or is constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. The terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0025] refer to Figures 1 to 4 One embodiment of this utility model provides a quick-release compact explosion-proof electric wrench, including a combined outer shell 1 and a hollow explosion-proof inner shell 2. The explosion-proof inner shell 2 has a motor compartment 21, a wiring compartment 22, and a battery compartment 23 from top to bottom. The motor compartment 21 houses a DC brushless motor 3, which includes a stator assembly 31 and a rotor assembly 32 movably fitted inside the stator assembly 31. The stator assembly 31 is fixedly connected to the inner wall of the explosion-proof inner shell 2. The rotor assembly 32 includes a motor shaft 321 that passes through the explosion-proof inner shell 2. The front end of the motor shaft 321 extends out of the explosion-proof inner shell 2 and is connected to a reduction gearbox 4. The front end of the reduction gearbox 4 is connected to a torque transmission mechanism 5. A head shell 6 is fitted around the reduction gearbox 4 and the torque transmission mechanism 5. The front opening end of the explosion-proof inner shell 2 is fixedly connected to the head shell 6, and the rear opening end of the explosion-proof inner shell 2 is covered with an explosion-proof rear cover 24. A speed regulating mechanism 7 is installed inside the cable tray 22 to adjust the speed of the brushless DC motor 3 and control the output torque of the impact wrench. A battery mechanism 8 is installed inside the battery tray 23, and the bottom opening of the battery tray 23 is covered with an explosion-proof base plate 25. The battery mechanism 8 includes a battery pack 81 and a controller board 82. The battery pack 81 can be a lithium-ion battery pack. The controller board 82 is fixed inside the battery tray 23 by a fixing plate 83. The battery pack 81 is located below the fixing plate 83. The battery pack 81 is electrically connected to the controller board 82, the brushless DC motor 3, and the speed regulating mechanism 7. The electrical wires are threaded through and stored in the cable tray 22.

[0026] Compared to the traditional method of fixing the entire brushless DC motor 3 to the explosion-proof inner shell 2 using a fixing plate or other mechanisms, this embodiment directly fixes the stator assembly 31 of the brushless DC motor 3 to the explosion-proof inner shell 2 before assembling the rotor assembly 32. This significantly saves internal assembly space in the motor compartment 21, improves concentricity during motor transmission, simplifies assembly steps, increases transmission efficiency, ensures high torque output, and provides convenient and safe operation. The explosion-proof inner shell 2 isolates electrical components prone to short-circuit sparks or explosions from the external mine environment, achieving self-explosion protection and preventing dangerous situations such as fires and explosions caused by circuit failures or explosions within the mine. During operation, powered by the battery mechanism 8, the brushless DC motor 3 drives the motor shaft 321, which in turn drives the reduction gearbox 4 and torque transmission mechanism 5. The motor torque is output multiple times to the power output shaft of the torque transmission mechanism 5. The speed adjustment mechanism 7 adjusts the output torque, thereby completing the installation and removal of bolts or nuts.

[0027] refer to Figure 4 and Figure 5 The front end of the motor compartment 21 is provided with a limiting platform 211 integrally formed with the explosion-proof inner shell 2, and the limiting platform 211 abuts against the front end of the stator assembly 31. The limiting platform 211 is provided with at least two limiting holes 212, preferably four limiting holes 212 at equal intervals. The rear end of the stator assembly 31 is pressed with an annular stator pressure ring 33, the inner diameter of the stator pressure ring 33 being smaller than the outer diameter of the stator assembly 31. A limiting bolt 213 is inserted between the stator pressure ring 33 and the limiting hole 212. The limiting bolt 213 is located on the outer ring of the stator assembly 31, thereby fixing the stator assembly 31 in the motor compartment 21 of the explosion-proof inner shell 2. Unlike the traditional brushless DC motor 3 which is fixed in the explosion-proof inner shell by the motor mounting plate, in this embodiment, the stator assembly 31 is first fixedly assembled in the explosion-proof inner shell 2, and then the rotor assembly 32 is assembled. This not only improves the assembly stability of the motor, reduces the space occupied by the brushless DC motor, and saves costs, but also improves the concentricity of the motor installation and improves the transmission efficiency of the electric wrench.

[0028] refer to Figure 2 and Figure 4 The rear end of the motor shaft 321 extends out of the explosion-proof back cover 24 and is connected to a synchronously rotating first cooling fan 9. The first cooling fan 9 is located between the combined housing 1 and the explosion-proof back cover 24. The rear end of the motor shaft 321 is also fitted with a synchronously rotating second cooling fan 10. The second cooling fan 10 is located between the explosion-proof back cover 24 and the stator assembly 31. During operation, the first cooling fan 9 and the second cooling fan 10 respectively dissipate heat and cool the motor and the interior of the housing.

[0029] refer to Figure 2 , Figure 4 and Figure 6The reduction gearbox 4 includes a gear ring 41, which is fixedly connected to the combined housing 1. Three planetary gears 42 are meshed within the inner ring of the gear ring 41. The torque transmission mechanism 5 includes a power shaft 51, with a planetary chuck 511 at its rear end. The three planetary gears 42 are embedded within the planetary chuck 511. The front end of the motor shaft 321 is fitted within the planetary chuck 511 and meshes with the three planetary gears 42. The motor shaft 321 is driven to rotate by a brushless DC motor 3. The motor shaft 321 drives the three planetary gears 42 to rotate around their own axes via gear transmission. The use of three planetary gears improves the stability of torque transmission. The three planetary gears 42 rotate along the inside of the gear ring 41, simultaneously driving the power shaft 51 to rotate synchronously around its own axis. This transmits the rotational speed of the motor shaft 321 to the power shaft 51 at the required reduction ratio, thereby increasing the output torque of the power shaft 51. The electric wrench provided by this invention can output a maximum torque of 2000 N·m.

[0030] refer to Figure 4 Bearings 322 are interference-fitted at the connection points between the motor shaft 321 and the planetary chuck 511, between the planetary chuck 511 and the explosion-proof inner shell 2, and between the motor shaft 321 and the explosion-proof inner shell 2. Copper sleeves 323 are interference-fitted at the through-hole connections between the explosion-proof inner shell 2 and the motor shaft 321, and between the motor shaft 321 and the explosion-proof rear cover 24. The bearings 322 ensure concentricity, reduce friction and wear at rotating connection points, and improve the rotational flexibility of the contact points. The copper sleeves 323 ensure concentric stability while preventing sparks from collisions between rotating parts, reducing the risk of explosion. The contact surfaces between the copper sleeves 323 and the motor shaft 321, the explosion-proof inner shell 2, and between the copper sleeves 323 and the motor shaft 321 and the explosion-proof rear cover 24 are all explosion-proof mating surfaces to ensure the explosion-proof effect.

[0031] refer to Figure 1 , Figure 2 and Figure 4 The modular outer casing 1 includes a detachably fixedly connected first casing 11 and second casing 12. The first casing 11 and second casing 12 are fitted and fixedly connected to the outside of the head housing 6 and the explosion-proof inner casing 2 from the left and right sides. (Reference) Figure 6 and Figure 7The outer circumferential side of the gear ring 41 is provided with a radially protruding limiting block 411. The limiting block 411 can be arc-shaped or square. The inner side of the rear opening end of the head housing 6 is provided with at least two limiting grooves 61. The limiting grooves 61 match the shape of the limiting block 411. The gear ring 41 is fitted inside the rear opening end of the head housing 6. The limiting blocks 411 are embedded in the limiting grooves 61 one by one, so that the gear ring 41 and the head housing 6 are fixedly connected. This ensures that the gear ring 41 is fixed when the planetary gear 42 rotates along the gear ring 41. Furthermore, the limiting blocks 411 embedded in the limiting grooves 61 can improve the concentricity of the rotation of the motor shaft 321 and the power shaft 51 during the operation of the gearbox 4.

[0032] refer to Figure 1 and Figure 3 The first housing 11 and the second housing 12 are installed on the outside of the upper motor compartment 21 and wiring compartment 22 of the explosion-proof inner housing 2. The outer side of the combined housing 1 is also fixed with a handle 13 to facilitate the user to pick up and put away the electric wrench. The outer side of the battery compartment 23 is also fixed with a hook 14 to facilitate the hanging of the electric wrench.

[0033] refer to Figure 2 and Figure 4 The speed control mechanism 7 includes a connected signal switch 71 and a speed control button 72. A switch bracket 73 is fixed inside the wiring compartment 22, and the signal switch 71 is fixedly connected to the switch bracket 73 via a retainer 74. A T-shaped threaded ring 75 is fitted around the speed control button 72, passing through and fixed within the combined outer shell 1 and the explosion-proof inner shell 2. The speed control button 72 can extend and retract within the T-shaped threaded ring 75. An explosion-proof mating surface is provided between the T-shaped threaded ring 75 and the explosion-proof inner shell 2 to ensure the explosion-proof effect of the threaded mating surface. The motor speed can be changed in real time by manually pressing the speed control button 72 to control the pressing amplitude, thereby achieving flexible control of the electric wrench's output torque.

[0034] refer to Figure 2 , Figure 4 and Figure 8 A battery unlocking mechanism 26 is provided between the battery compartment 23 and the battery pack 81. The battery unlocking mechanism 26 includes a latch 261, a limit pin 262, and an unlocking button 263. The latch 261 may be made of zinc alloy. (Reference) Figure 9The latch 261 has an opening slot 2611 at one end and a protruding locking block 2612 at the other end. The locking block 2612 has a wedge-shaped surface. The middle part of the latch 261 is pivotally connected to the battery compartment 23 through a limiting pin 262. The limiting pin 262 is fixedly connected to the inner wall of the battery compartment 23. The side of the battery compartment 23 has an unlocking hole 231. The unlocking button 263 passes through the unlocking hole 231. The end of the unlocking button 263 is vertically embedded in the opening slot 2611. A spring 2613 abuts against the unlocking button 263 and the opening slot 2611. The side of the battery pack 81 has a locking groove 811. The locking block 2612 is positioned corresponding to the locking groove 811. When the battery pack 81 is installed inside the battery compartment 23, the locking block 2612 is locked inside the locking groove 811. When the battery pack 81 needs to be removed, press the unlock button 263 to push one end of the opening slot 2611 of the latch 261 inward. Through the pivoting connection of the limiting pin 262, one end of the locking block 2612 is disengaged from the slot 811, thus removing the limitation on the battery pack 81 and allowing the battery pack 81 to be removed from the battery compartment 23. When installing the battery pack 81, simply push the battery pack 81 into the battery compartment 23 and slide it along the wedge-shaped surface of the locking block 2612 until the locking block 2612 is finally embedded in the slot 811, fixing the position of the battery pack 81 and preventing it from loosening.

[0035] refer to Figure 2 and Figure 4 The battery compartment 23 has an external charging port 232 on its side. A DC female connector 84 and a threaded cover 233 are installed inside the external charging port 232. The DC female connector 84 is electrically connected to the battery pack 81 and the controller board 82. The threaded cover 233 is threaded to the opening end of the external charging port 232. (Reference) Figure 10 A handle groove 812 is provided on the bottom side of the battery pack 81 adjacent to the explosion-proof base plate 25. A handle ring 813 is hinged in the handle groove 812. The battery pack 81 is provided with an internal charging port 814. The battery pack 81 can be removed from the battery compartment 23 through the handle groove 812. The internal charging port 814 is connected to an external charger to charge the battery pack 81. In this embodiment, the explosion-proof electric wrench can be charged by connecting to an external charger through a DC female connector, or the battery pack 81 can be removed from the battery compartment 23 for independent charging, which can meet different charging needs.

[0036] refer to Figure 2 , Figure 3 and Figure 9The battery compartment 23 has a gear adjustment hole 234 on its side. A button plate 235, which is electrically connected to the controller board 82, is vertically fixed on the fixing plate 83. A gear adjustment button 236 passes through the gear adjustment hole 234, and the insertion surface between the gear adjustment button 236 and the gear adjustment hole 234 is an explosion-proof mating surface. One end of the gear adjustment button 236 extends out of the battery compartment 23, and the other end abuts vertically against the button plate 235. A spring abuts between the gear adjustment button 236 and the gear adjustment hole 234. By pressing the gear adjustment button 236, the output torque of the electric wrench can be adjusted, limiting the maximum output torque at each gear position.

[0037] In this utility model, the head housing 6, the explosion-proof inner housing 2, the explosion-proof rear cover 24, and the explosion-proof base plate 25 are all made of stainless steel. The explosion-proof performance of the electric torque wrench provided by this utility model meets the relevant provisions of standards GB / T3836.1-2021 "Explosive Atmospheres - Part 1: Equipment - General Requirements" and GB / T3836.2-2021 "Explosive Atmospheres - Part 2: Equipment Protected by Explosion-Proof Enclosures 'd'".

[0038] Although the preferred embodiments of this utility model have been disclosed above, they are not intended to limit this utility model. Any person skilled in the art can make possible changes and modifications to the technical solutions of this utility model by utilizing the methods and techniques disclosed above without departing from the spirit and scope of this utility model. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this utility model without departing from the content of the technical solutions of this utility model shall fall within the protection scope of the technical solutions of this utility model.

Claims

1. A quick-release, compact, explosion-proof electric wrench, characterized in that, It includes a combined outer shell (1) and a hollow explosion-proof inner shell (2), wherein the explosion-proof inner shell (2) is provided with a motor compartment (21), a wiring compartment (22) and a battery compartment (23) from top to bottom. The motor compartment (21) is equipped with a DC brushless motor (3). The DC brushless motor (3) includes a stator assembly (31) and a rotor assembly (32) movably sleeved on the inner ring of the stator assembly (31). The stator assembly (31) is fixedly connected to the inner wall of the explosion-proof inner shell (2). The rotor assembly (32) includes a motor shaft (321) that passes through the explosion-proof inner shell (2). The front end of the motor shaft (321) extends out of the explosion-proof inner shell (2) and is connected to a gearbox (4). The front end of the gearbox (4) is connected to a torque transmission mechanism (5). The gearbox (4) and the torque transmission mechanism (5) are sleeved on the outside of the head shell (6). The front opening end of the explosion-proof inner shell (2) is fixedly connected to the head shell (6). The rear opening end of the explosion-proof inner shell (2) is covered with an explosion-proof rear cover (24). The cable tray (22) is equipped with a speed regulating mechanism (7), the battery tray (23) is equipped with a battery mechanism (8), and the bottom opening of the battery tray (23) is covered with an explosion-proof bottom plate (25). The battery mechanism (8) includes a battery pack (81) and a controller board (82). The controller board (82) is fixed in the battery compartment (23) by a fixing plate (83). The battery pack (81) is located below the fixing plate (83). The battery pack (81) is electrically connected to the controller board (82), the DC brushless motor (3), and the speed regulation mechanism (7).

2. The quick-release compact explosion-proof electric wrench according to claim 1, characterized in that, The front end of the motor compartment (21) is provided with a limiting platform (211) integrally formed with the explosion-proof inner shell (2). The limiting platform (211) abuts against the front end of the stator assembly (31). The limiting platform (211) is provided with at least two limiting holes (212). The rear end of the stator assembly (31) is provided with an annular stator pressure ring (33). The inner diameter of the stator pressure ring (33) is smaller than the outer diameter of the stator assembly (31). A limiting bolt (213) is provided between the stator pressure ring (33) and the limiting hole (212). The limiting bolt (213) is located on the outer ring of the stator assembly (31).

3. The quick-release compact explosion-proof electric wrench according to claim 1, characterized in that, The rear end of the motor shaft (321) extends out of the explosion-proof back cover (24) and is connected to a synchronously rotating first cooling fan (9). The first cooling fan (9) is located between the combined housing (1) and the explosion-proof back cover (24). The rear end of the motor shaft (321) is also fitted with a synchronously rotating second cooling fan (10). The second cooling fan (10) is located between the explosion-proof back cover (24) and the stator assembly (31).

4. The quick-release compact explosion-proof electric wrench according to claim 1, characterized in that, The gearbox (4) includes a gear ring (41), which is fixedly connected to the combined housing (1). The inner ring of the gear ring (41) is meshed with three planetary gears (42). The torque transmission mechanism (5) includes a power shaft (51), and a planetary chuck (511) is provided at the rear end of the power shaft (51). The three planetary gears (42) are embedded in the planetary chuck (511). The front end of the motor shaft (321) is sleeved in the planetary chuck (511) and meshes with the three planetary gears (42) respectively. The connection points between the motor shaft (321) and the planetary chuck (511), between the planetary chuck (511) and the explosion-proof inner shell (2), and between the motor shaft (321) and the explosion-proof inner shell (2) are respectively fitted with bearings (322). The connection points between the explosion-proof inner shell (2) and the motor shaft (321) and between the motor shaft (321) and the explosion-proof rear cover (24) are fitted with copper sleeves (323) in an interference fit.

5. The quick-release compact explosion-proof electric wrench according to claim 4, characterized in that, The combined outer shell (1) includes a first shell (11) and a second shell (12) that are detachably and fixedly connected. The first shell (11) and the second shell (12) are fitted and covered outside the head shell (6) and the explosion-proof inner shell (2) and are fixedly connected to the head shell (6) and the explosion-proof inner shell (2). At least two limiting grooves (61) are provided on the inner side of the rear opening end of the head shell (6). The outer circumferential side of the gear ring (41) is provided with a limiting block (411) that protrudes radially. The gear ring (41) is fitted inside the rear opening end of the head shell (6), and the limiting blocks (411) are embedded in the limiting grooves (61).

6. The quick-release compact explosion-proof electric wrench according to claim 1, characterized in that, The speed control mechanism (7) includes a connected signal switch (71) and a speed control button (72). A switch bracket (73) is fixed inside the cable tray (22). The signal switch (71) is fixedly connected to the switch bracket (73) through a card holder (74). A T-shaped threaded ring (75) is sleeved on the outside of the speed control button (72). The T-shaped threaded ring (75) is inserted and fixed in the combined outer shell (1) and the explosion-proof inner shell (2).

7. The quick-release compact explosion-proof electric wrench according to claim 1, characterized in that, A battery unlocking mechanism (26) is provided between the battery compartment (23) and the battery pack (81). The battery unlocking mechanism (26) includes a latch (261), a limiting pin (262), and an unlocking button (263). One end of the latch (261) is provided with an opening groove (2611), and the other end is provided with a protruding locking block (2612). The middle part of the latch (261) is pivotally connected to the battery compartment (23) through the limiting pin (262). The side of the battery compartment (23) is provided with an unlocking hole (231). The unlock button (263) is inserted into the unlock hole (231), and the end of the unlock button (263) is vertically embedded in the opening groove (2611). A spring (2613) abuts against the unlock button (263) and the opening groove (2611). The side of the battery pack (81) is provided with a slot (811). The position of the card block (2612) corresponds to the position of the slot (811). When the battery pack (81) is installed inside the battery compartment (23), the card block (2612) is locked inside the slot (811).

8. The quick-release compact explosion-proof electric wrench according to claim 1, characterized in that, The battery compartment (23) has an external charging port (232) on its side. A DC female connector (84) and a threaded cover (233) are installed inside the external charging port (232). The DC female connector (84) is electrically connected to the battery pack (81) and the controller board (82). The threaded cover (233) is threaded to the opening end of the external charging port (232).

9. The quick-release compact explosion-proof electric wrench according to claim 1, characterized in that, A handle groove (812) is provided on the bottom side of the battery pack (81) adjacent to the explosion-proof base plate (25). A handle ring (813) is hinged in the handle groove (812). An internal charging port (814) is provided on the battery pack (81). The battery pack (81) can be taken out from the battery compartment (23) through the handle groove (812). The internal charging port (814) is connected to an external charger to charge the battery pack (81).

10. The quick-release compact explosion-proof electric wrench according to claim 1, characterized in that, The battery compartment (23) has a gear adjustment hole (234) on its side. A button plate (235) electrically connected to the controller board (82) is vertically fixed on the fixing plate (83). A gear adjustment button (236) is inserted into the gear adjustment hole (234). One end of the gear adjustment button (236) extends out of the battery compartment (23) and the other end abuts against the button plate (235) vertically.

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