Mining explosion-proof handheld impact type torque wrench

Abstract

The utility model relates to the technical field of electric tools for mines, in particular to a mining explosion-proof handheld impact torque wrench which comprises an outer shell and an explosion-proof inner shell, a direct-current brushless motor is installed on the upper portion of the explosion-proof inner shell, and the front end of a motor shaft penetrates out of the explosion-proof inner shell to be sequentially connected with a speed reducing mechanism and an impact mechanism. The impact mechanism comprises a power spindle, a striking block, a T-shaped shaft and an impact spring, the rear end of the power spindle is connected with the speed reducing mechanism, the T-shaped shaft is fixed to the front end of the power spindle, the front end of the T-shaped shaft extends out of the shell, the striking block sleeves the power spindle, grooves are formed in the connecting surfaces of the striking block and the power spindle, balls are movably embedded in the grooves, and the two ends of the impact spring abut against the striking block and the power spindle; an 8-shaped movable groove is formed in the front end face of the striking block, the T-shaped shaft comprises an output shaft and a striking anvil block, and the striking anvil block can rotate in the movable groove. The mining explosion-proof handheld impact type torque wrench can effectively solve the technical problems that an existing electric impact wrench does not have the explosion-proof performance and is small in torque.

Description

Technical Field

[0001] This utility model relates to the field of power tools for mining, and in particular to a mine explosion-proof handheld impact torque wrench. Background Technology

[0002] A wrench is a common installation and disassembly tool. It is a hand tool that uses leverage to tighten or loosen bolts, screws, nuts, and other threaded fasteners. Many wrenches are now electric, improving the efficiency of bolt installation and removal. Electric torque wrenches are powered by an electric motor or battery, providing significant torque to tighten high-strength bolts. They are widely used in various industries for bolted installation and disassembly, offering advantages such as high torque, faster tightening than manual methods, and greater reliability.

[0003] In special working environments such as mines containing methane or explosive coal dust, traditional electric wrenches do not have explosion-proof performance. During operation, the internal battery or motor is prone to short circuits and sparks due to overheating, which can lead to explosions and other safety accidents. Furthermore, traditional electric impact wrenches have high impact frequency and large impact force during operation, and the impact of metal impact blocks can also easily generate sparks, posing a risk of explosion. Therefore, manual wrenches are mostly used in underground mining operations, but manual wrenches are inefficient, time-consuming, and labor-intensive. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a mine-use explosion-proof handheld impact torque wrench. When used in special environments such as mines, it has good explosion-proof performance, high safety performance, is easy to carry, and has a large torque force and high working efficiency. It can effectively solve the technical problems that existing electric impact wrenches have low torque and lack explosion-proof performance, making them unsuitable for use in mining environments.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0006] One technical solution of this utility model provides a mine explosion-proof handheld impact torque wrench, including a shell, the inside of which is provided with an explosion-proof inner shell;

[0007] A DC brushless motor is installed in the upper part of the inner cavity of the explosion-proof inner shell. The front end of the motor shaft of the DC brushless motor passes through the explosion-proof inner shell and is connected to a reduction mechanism. The front end of the reduction mechanism is connected to an impact mechanism.

[0008] The impact mechanism includes a power spindle, a striking block, a T-shaped shaft, and an impact spring. The rear end of the power spindle is connected to a reduction mechanism, and the front end of the power spindle is fixedly connected to the T-shaped shaft. The front end of the T-shaped shaft extends out of the housing. The striking block is movably sleeved on the outside of the power spindle, and grooves are provided on the connection surfaces of both the striking block and the power spindle. Ball bearings are movably embedded in the grooves. The front end of the impact spring abuts against the striking block, and the rear end abuts against the power spindle.

[0009] The front end face of the striking block is provided with an "8"-shaped movable groove. The T-shaped shaft includes an output shaft and a striking anvil connected to its rear end. The striking anvil can rotate within the movable groove.

[0010] Using the above technical solution, during operation, under the spring stress of the impact spring, the striking block is sleeved on the front end of the power spindle and abuts against the T-shaped shaft. At this time, the striking anvil is accommodated in the movable groove. The DC brushless motor drives the motor shaft to rotate and transmits power to the power spindle through the dynamic reduction mechanism, thereby driving the T-shaped shaft to rotate and output torque. The striking anvil rotates in the movable groove. While the power spindle rotates, the balls move along the groove, thereby pushing the striking block backward to compress the impact spring. When the striking anvil leaves the movable groove, it continues to rotate. Under the spring stress, the impact spring pushes the striking block forward again, and the balls move in the opposite direction along the groove. The striking anvil rotates to the opposite side of the movable groove. The side wall of the movable groove abuts against the side of the striking anvil, forming an impact in the circumferential direction. Thus, the intermittent continuous impact on the T-shaped shaft in the circumferential direction can be achieved by the reciprocating extension and retraction of the impact block, thereby increasing the output torque.

[0011] In some possible implementations, the striking anvil includes two stops arranged symmetrically along the output shaft axis, and the side of each stop includes a first arc surface, a second arc surface, and a third arc surface connected in sequence.

[0012] The movable groove includes two grooves arranged symmetrically along the axis of the striking block. The sides of the grooves include a first side, a second side, and a third side connected in sequence. The first side matches the shape of the first arc surface, and the third side matches the shape of the third arc surface. When the striking anvil is housed in the movable groove and rotates, the second arc surface abuts against the second side and rotates along the second side.

[0013] By setting the side of the stop block as an arc surface and setting the sides of the two grooves of the movable groove as arc surfaces that match the shape of the side of the stop block, the concentricity of the striking anvil seat when rotating in the movable groove can be guaranteed, and the striking continuity of the impact block on the T-shaped shaft can be improved.

[0014] In some possible implementations, the reduction mechanism includes an internal gear ring and at least two planetary gears. A planetary chuck is located at the rear end of the power spindle, and the planetary gears are embedded in the planetary chuck and mesh with the internal gear ring. A motor gear shaft is fixedly connected to the front end of the motor shaft, and the motor gear shaft is sleeved inside the planetary chuck and meshes with the planetary gears. The internal gear ring is fixedly connected to the outer shell. A DC brushless motor drives the motor gear shaft to rotate. The motor gear shaft, through gear transmission, drives the planetary gears to rotate around their own axis while simultaneously rotating along the internal gear ring, rotating synchronously with the power spindle fixed to the planetary gears. This reduces the speed of the high-speed rotating motor shaft according to a set reduction ratio and transmits it to the power spindle, thereby increasing the output torque of the power spindle, which is then transmitted to the T-shaft, achieving high torque output.

[0015] In some possible implementations, the planetary chuck has an outwardly extending insertion portion at its rear end, and a main shaft connecting groove is provided on the front side of the upper part of the explosion-proof inner shell. The motor gear shaft passes through the main shaft connecting groove. The insertion portion is sleeved on the outside of the motor gear shaft and inserted into the inside of the main shaft connecting groove, thereby enabling the power main shaft to achieve synchronous linkage with the motor shaft through the motor gear shaft and planetary gears. An inner bearing is sleeved and connected between the insertion portion and the motor gear shaft, which improves the rotational flexibility between the two and prevents the power main shaft from moving out of alignment, ensuring that the power main shaft and the motor shaft are concentric. An outer bearing is sleeved and connected between the insertion portion and the inner wall of the main shaft connecting groove, which improves the rotational flexibility between the two and prevents the power main shaft from moving out of alignment during the impact of the striking block on the T-shaped shaft, ensuring that the power main shaft and the motor shaft are concentric.

[0016] In some possible implementations, the outer casing includes a left casing, a right casing, and a head casing. The head casing covers the outside of the deceleration mechanism and the impact mechanism. The front end of the T-shaped shaft extends out of the head casing. The rear opening end of the head casing is fixedly connected to the front end face of the explosion-proof inner casing. The left casing and the right casing are respectively fitted and covered on the left and right sides of the head casing and the explosion-proof inner casing. The left casing is fixedly connected to the explosion-proof inner casing, and the right casing is fixedly connected to the explosion-proof inner casing.

[0017] In some possible implementations, at least three arc-shaped protrusions are provided radially on the outer circumferential side of the internal gear ring, and an arc-shaped groove matching the shape of the arc-shaped protrusions is provided on the inner wall of the rear port of the head housing. The internal gear ring and the head housing are fixedly connected by the arc-shaped protrusions engaging one by one in the arc-shaped groove, ensuring that the internal gear ring remains stationary when the planetary gear rotates along the internal gear ring. Furthermore, the arc-shaped protrusions engaging the arc-shaped groove can fix the center of the circle, improving the concentricity of the motor gear shaft and the power main shaft during the operation of the reduction mechanism.

[0018] In some possible implementations, a washer is embedded in the side of the head housing that abuts against the striking block to absorb shock and reduce the impact wear of the striking block on the head housing. A third bearing and a third copper sleeve are fitted at the joint between the T-shaped shaft and the head housing to ensure concentric stability and improve the rotational flexibility of the contact area.

[0019] In some possible implementations, the explosion-proof inner shell includes an integrally formed motor compartment, a handle portion, and a power supply compartment distributed from top to bottom;

[0020] The brushless DC motor is located inside the motor compartment. The front side of the brushless DC motor is fixedly connected to the front side of the explosion-proof inner shell through a motor fixing plate. An explosion-proof rear cover is provided on the rear side of the explosion-proof inner shell. A rubber pad is provided between the rear side of the brushless DC motor and the explosion-proof rear cover. The rubber pad is used to prevent the brushless DC motor from moving back and forth inside the explosion-proof inner shell.

[0021] In some possible implementations, a speed regulating mechanism is installed inside the handle portion. The speed regulating mechanism includes a speed regulator, a speed regulator button and a reversing push rod connected thereto. The speed regulator is fixedly connected to the handle portion through a switch fixing bracket. The speed regulating button is movably sleeved in a T-shaped threaded ring, which is fixedly connected to the handle portion. Both ends of the reversing push rod extend out of the handle portion and the outer casing.

[0022] The speed of the DC brushless motor can be controlled by the speed controller. The speed of the DC brushless motor can be changed in real time by manually adjusting the amount of pressure on the speed control button, thereby achieving flexible control of the output torque of the impact wrench. The forward and reverse directions of the DC brushless motor can be adjusted by pressing the reversing push rod from the left and right sides of the housing to meet the tightening or loosening requirements of different bolts.

[0023] In some possible implementations, the power supply compartment houses a battery box and an electronic control assembly. The electronic control assembly includes a power control board and a battery. The power control board is located on top of the battery box, and the battery is housed inside the battery box. The battery is electrically connected to the power control board, a speed controller, and a brushless DC motor via electrical wires. The battery supplies power to the brushless DC motor, and the switching on and off of a switch transmits signals to the power control board, controlling the current entering the brushless DC motor coils. This drives the brushless DC motor rotor to rotate, and the rotational force is transmitted to the reduction gear through the motor shaft. A set reduction ratio increases the motor torque and further transmits it to the T-shaft output, thereby enabling the installation or removal of bolts or nuts.

[0024] This utility model has the following beneficial effects:

[0025] This utility model provides a mine-use explosion-proof handheld impact torque wrench with excellent explosion-proof performance, high safety, and easy portability. It also features high torque, strong impact force, and high working efficiency, allowing nuts to be easily unloaded under impact force. It is suitable for installing or disassembling high-torque bolts, screws, nuts, and other threaded fasteners with openings or sockets in special environments such as mines. This utility model isolates the DC brushless motor, speed controller, power control board, battery, and other electrical components prone to short-circuit sparks or explosions from the external mine environment by setting up an explosion-proof inner shell, thus preventing fires or explosions caused by short circuits or sparks. Furthermore, by incorporating a reduction and impact mechanism, the motor torque is multiplied and output to the power output shaft, thereby increasing the wrench's working torque for installing and disassembling high-torque bolts or nuts. The reduction and impact mechanisms provided in this utility model also have higher power transmission efficiency and higher synchronization with the motor shaft, ensuring a stable and large torque output from the impact wrench. Attached Figure Description

[0026] The accompanying drawings are provided to further understand 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 and do not constitute a limitation thereof.

[0027] Figure 1 This is a three-dimensional structural diagram of the explosion-proof handheld impact torque wrench for mining according to this utility model.

[0028] Figure 2 This is another three-dimensional structural diagram of the explosion-proof handheld impact torque wrench for mining according to this utility model.

[0029] Figure 3 This is a partially sectional front view of the explosion-proof handheld impact torque wrench for mining according to this utility model;

[0030] Figure 4 for Figure 3 Cross-sectional view of the internal structure along line “AA”;

[0031] Figure 5 This is a cross-sectional schematic diagram of the upper part of the explosion-proof handheld impact torque wrench for mining applications of this utility model.

[0032] Figure 6 for Figure 5 A magnified view of the area marked "B" in the middle;

[0033] Figure 7 This is a partial exploded structure diagram of the explosion-proof handheld impact torque wrench for mining according to this utility model.

[0034] Figure 8This is a three-dimensional structural diagram of the impact mechanism in this utility model;

[0035] Figure 9 This is a three-dimensional structural diagram of the T-shaped shaft in this utility model;

[0036] Figure 10 This is a schematic diagram of the rear end face of the striking block in this utility model;

[0037] Figure 11 This is a front view of the front end face of the striking block in this utility model;

[0038] Figure 12 This is a schematic diagram of the main shaft connecting groove on the explosion-proof inner shell of this utility model;

[0039] Figure 13 This is a schematic diagram of the connection structure between the deceleration mechanism and the impact mechanism in this utility model;

[0040] Figure 14 This is a schematic diagram of the connection structure between the deceleration mechanism and the impact mechanism inside the machine head housing in this utility model;

[0041] Figure 15 This is a three-dimensional structural diagram of the machine head housing in this utility model;

[0042] Figure 16 This is a rear view of the explosion-proof handheld impact torque wrench for mining according to this utility model.

[0043] Figure 17 for Figure 16 Cross-sectional view of the internal structure along the "CC" line;

[0044] Figure 18 for Figure 16 Cross-sectional view of the internal structure along line “DD”.

[0045] Explanation of the labels in the diagram:

[0046] 1. Outer shell; 11. Left outer shell; 12. Right outer shell; 13. Head shell; 131. Arc-shaped groove; 132. Washer; 133. Third bearing; 134. Third copper sleeve;

[0047] 2. Explosion-proof inner shell; 21. Main shaft connecting groove; 22. Motor compartment; 23. Handle part; 24. Power supply compartment; 241. Gear slot; 242. Gear adjustment button; 243. Button spring; 244. Button board; 245. Power socket; 246. DC female connector; 247. Threaded cover; 25. Motor mounting plate; 26. Explosion-proof rear cover; 27. Rubber pad; 28. Switch mounting bracket; 29. ​​Base plate;

[0048] 3. DC brushless motor; 31. Motor shaft; 311. First bearing; 312. First copper sleeve; 313. Second bearing; 314. Second copper sleeve; 32. Motor gear shaft;

[0049] 4. Reduction mechanism; 41. Internal gear ring; 411. Arc-shaped protrusion; 42. Planetary gear;

[0050] 5. Impact mechanism; 51. Power spindle; 511. Planetary chuck; 512. Connecting part; 513. Inner bearing; 514. Outer bearing; 52. Striking block; 521. Movable groove; 522. Groove; 5221. First side surface; 5222. Second side surface; 5223. Third side surface; 523. U-shaped groove; 53. T-shaped shaft; 531. Output shaft; 532. Striking anvil; 533. Stop block; 5331. First arc surface; 5332. Second arc surface; 5333. Third arc surface; 54. Impact spring; 55. Ball bearing; 56. Groove;

[0051] 6. Speed ​​regulating mechanism; 61. Speed ​​controller; 62. Speed ​​regulating button; 63. Directional push rod; 64. T-shaped threaded ring;

[0052] 7. Electrical control components; 71. Power control board; 72. Battery; 73. Electrical wires; 8. Cooling fan; 9. Battery box. Detailed Implementation

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] refer to Figures 1 to 7 One embodiment of this utility model provides a mine-use explosion-proof handheld impact torque wrench, including a shell 1, inside which is an explosion-proof inner shell 2. The explosion-proof inner shell 2 is hollow, and a DC brushless motor 3 is installed in the upper part of the inner cavity of the explosion-proof inner shell 2. The front end of the motor shaft 31 of the DC brushless motor 3 passes through the explosion-proof inner shell 2 and is connected to a reduction mechanism 4. The front end of the reduction mechanism 4 is connected to an impact mechanism 5. This embodiment sets up an explosion-proof inner shell 2 to isolate electrical components that are prone to short-circuit sparks or explosions from the external mine environment, achieving its own explosion-proof effect and avoiding dangerous situations such as fires and explosions in the mine due to circuit failures or explosions.

[0058] Specifically, refer to Figure 4 , Figure 5 and Figure 13 The impact mechanism 5 includes a power spindle 51, an impact block 52, a T-shaped shaft 53, and an impact spring 54. The rear end of the power spindle 51 is connected to a reduction mechanism 4. A DC brushless motor 3 drives the reduction mechanism 4 through a motor shaft 31. Simultaneously, the reduction mechanism 4, through a certain differential speed ratio, drives the front end of the power spindle 51 to rotate coaxially with the motor shaft 31. The front end of the power spindle 51 is fixedly connected to the T-shaped shaft 53, with the front end of the T-shaped shaft 53 extending out of the outer casing 1. The impact block 52 is cylindrical and movably sleeved on the outside of the power spindle 51. (Reference) Figure 5 and Figure 6 Both the striking block 52 and the power spindle 51 have spirally recessed grooves 56 on their connecting surfaces. The grooves 56 on the power spindle 51 extend spirally around the axis of the power spindle 51. The grooves 56 on the striking block 52 and the power spindle 51 are matched. A ball bearing 55 is movably embedded in the groove 56 and can roll along the groove 56 (this part is a relatively mature technology and will not be described in detail here). The front end of the impact spring 54 abuts against the striking block 52, and the rear end abuts against the planetary chuck 511 at the rear end of the power spindle 51.

[0059] refer to Figures 8 to 11 The front end face of the striking block 52 is provided with a figure-eight shaped recessed movable groove 521. The T-shaped shaft 53 includes an output shaft 531 and a striking anvil 532 connected to its rear end. The output shaft 531 is used to connect an external torque tool or adapter for tightening or unloading bolts. The striking anvil 532 can rotate within the movable groove 521.

[0060] Further, refer to Figure 9 The striking anvil 532 includes two stops 533 arranged symmetrically along the axis of the output shaft 531. The side surfaces of each stop 533 include a first arc surface 5331, a second arc surface 5332, and a third arc surface 5333 connected sequentially in an arc shape. (Reference) Figure 8 and Figure 11 The movable groove 521 includes two grooves 522 arranged symmetrically along the axis of the striking block 52. The sides of each groove 522 include a first side surface 5221, a second side surface 5222, and a third side surface 5223 connected sequentially. The first side surface 5221 matches the shape of a first arc surface 5331, and the third side surface 5223 matches the shape of a third arc surface 5333. When the striking anvil 532 rotates within the movable groove 521, the second arc surface 5332 abuts against the second side surface 5222 and rotates along it. By setting the side of the stop block 533 as an arc surface and setting the sides of the two grooves 522 of the movable groove 521 as arc-shaped sides that match the shape of the side of the stop block 533, the concentricity of the striking anvil 532 when rotating within the movable groove 521 can be ensured, improving the striking continuity of the striking block 52 on the T-shaped shaft 53. The stop block 533 rotates within the groove 522 at an angle of 90 to 130 degrees. Preferably, the rotation angle of the stop 533 within the groove 522 is set to 100~120 degrees.

[0061] refer to Figure 5 and Figure 10 The impact block 52 has a U-shaped groove 523 circumferentially arranged on its side wall. The opening of the U-shaped groove 523 is located on the rear end face of the impact block 52, and the impact spring 54 is sleeved in the U-shaped groove 523. The U-shaped groove 523 is used to install the impact spring 54 to prevent instability in the installation position of the impact spring 54 and to prevent it from twisting or deforming during compression or rebound.

[0062] In this embodiment, when the impact wrench is in operation, under the spring stress of the impact spring 54, the striking block 52 is sleeved on the front end of the power spindle 51 and abuts against the T-shaped shaft 53. At this time, the striking anvil 532 is accommodated in the movable groove 521. The DC brushless motor 3 drives the motor shaft 31 to rotate and transmits power to the power spindle 51 through the dynamic reduction mechanism 4, thereby driving the T-shaped shaft 53 to rotate and output torque. The striking anvil 532 rotates in the movable groove 521. While the power spindle 51 rotates, the ball bearing 55 moves along the groove 56, thereby pushing the striking block. The impact spring 54 is compressed backward. After the striking anvil 532 disengages from the movable groove 521, it continues to rotate. Under the spring stress, the impact spring 54 pushes the striking block 52 forward again. The ball 55 moves in the opposite direction along the groove 56. The striking anvil 532 rotates into the opposite side of the movable groove 521. The side wall of the movable groove 521 abuts against the side of the striking anvil 532 to form an impact in the circumferential direction. Thus, the T-shaped shaft 53 can be intermittently and continuously struck in the circumferential direction by the reciprocating extension and retraction of the impact block 52, thereby increasing the output torque.

[0063] refer to Figure 1 and 4 In some embodiments, the outer casing 1 includes a left casing 11, a right casing 12, and a head casing 13. The head casing 13 covers the exterior of the reduction mechanism 4 and the impact mechanism 5. The front end of the T-shaped shaft 53 extends out of the head casing 13, and the rear opening end of the head casing 13 is fixedly connected to the front end face of the explosion-proof inner casing 2 by bolts. The left casing 11 and the right casing 12 are respectively fitted and covered on the left and right sides of the head casing 13 and the explosion-proof inner casing 2. The left casing 11 and the explosion-proof inner casing 2, and the right casing 12 and the explosion-proof inner casing 2 are both fixedly connected by screws, and the screw connection is a threaded explosion-proof mating surface.

[0064] refer to Figure 13 and Figure 14 In some embodiments, the reduction mechanism 4 includes an internal gear ring 41 and at least two planetary gears 42. Preferably, two planetary gears 42 are provided. A planetary chuck 511 is provided at the rear end of the power main shaft 51, and the planetary gears 42 are embedded in the planetary chuck 511 and mesh with the internal gear ring 41. (Reference) Figure 4The front end of the motor shaft 31 is fixedly connected to a motor gear shaft 32, which is sleeved inside the planetary chuck 511 and meshes with the planetary gear 42. The inner gear ring 41 is fixedly connected to the outer shell 1. The motor gear shaft 32 is driven to rotate by a DC brushless motor 3. The motor gear shaft 32 drives the planetary gear 42 to rotate around its own axis and rotate along the inner gear ring 41 through gear transmission, rotating synchronously with the power main shaft 51 fixed to the planetary gear 42. This reduces the speed of the high-speed rotating motor shaft 31 according to a set reduction ratio and transmits it to the power main shaft 51, thereby increasing the output torque of the power main shaft 51, which is then transmitted to the T-shaped shaft 53 to achieve high torque output. The reduction ratio of the reduction mechanism 4 is controlled at 90~100:1, and the output torque of the mining explosion-proof handheld impact torque wrench of this utility model can be controlled at 200~350 N·m.

[0065] refer to Figure 6 , Figure 12 and Figure 13 In some embodiments, the planetary chuck 511 has an outwardly extending insertion portion 512 at its rear end, and the front side of the upper part of the explosion-proof inner shell 2 has a main shaft connecting groove 21. The motor gear shaft 32 passes through the main shaft connecting groove 21, and the insertion portion 512 is sleeved on the outside of the motor gear shaft 32 and inserted into the inside of the main shaft connecting groove 21, thereby enabling the power main shaft 51 to achieve synchronous linkage with the motor shaft 31 through the motor gear shaft 32 and the planetary gear 42. (Reference) Figure 4 and Figure 5 An inner bearing 513 is sleeved between the plug-in part 512 and the motor gear shaft 32, which improves the rotational flexibility between the two and prevents the power main shaft 51 from moving, ensuring that the power main shaft 51 and the motor shaft 31 are concentric. An outer bearing 514 is sleeved between the plug-in part 512 and the inner wall of the main shaft connecting groove 21, which improves the rotational flexibility between the two and prevents the power main shaft 51 from moving during the impact of the striking block 52 on the T-shaped shaft 53, ensuring that the power main shaft 51 and the motor shaft 31 are concentric.

[0066] refer to Figures 13 to 15 In some embodiments, at least three arc-shaped protrusions 411 are provided radially on the outer circumferential side of the internal gear ring 41, and an arc-shaped groove 131 matching the shape of the arc-shaped protrusions 411 is provided on the inner wall of the rear port of the head housing 13. The internal gear ring 41 and the head housing 13 are fixedly connected by the arc-shaped protrusions 411 engaging with the arc-shaped groove 131, ensuring that the internal gear ring 41 remains fixed when the planetary gear 42 rotates along the internal gear ring 41. Furthermore, the engagement of the arc-shaped protrusions 411 with the arc-shaped groove 131 can fix the center of rotation, improving the concentricity of the rotation of the motor gear shaft 32 and the power main shaft 51 during the operation of the reduction mechanism 4.

[0067] refer to Figure 4 and Figure 5 In some embodiments, a washer 132 is embedded in the side of the head housing 13 that abuts against the striking block 52 to absorb shock and reduce the impact wear of the striking block 52 on the head housing 13. A third bearing 133 and a third copper sleeve 134 are fitted at the joint between the T-shaped shaft 53 and the head housing 13 to ensure concentric stability and improve the rotational flexibility of the contact part.

[0068] refer to Figure 4 and Figure 7 In some embodiments, the explosion-proof inner shell 2 includes an integrally formed motor compartment 22, a handle portion 23, and a power supply compartment 24 distributed from top to bottom. The brushless DC motor 3 is housed within the motor compartment 22. The front side of the brushless DC motor 3 is fixedly connected to the front side of the explosion-proof inner shell 2 via a motor fixing plate 25. An explosion-proof rear cover 26 is provided on the rear side of the explosion-proof inner shell 2. A rubber pad 27 is provided between the rear side of the brushless DC motor 3 and the explosion-proof rear cover 26 to prevent the brushless DC motor 3 from moving back and forth within the explosion-proof inner shell 2. An explosion-proof mating surface is provided between the explosion-proof rear cover 26 and the explosion-proof inner shell 2 to improve the explosion-proof effect. (Reference) Figure 5 A first bearing 311 and a first copper sleeve 312 are interference-fitted between the front side of the explosion-proof inner shell 2 and the penetration part of the motor shaft 31. A second bearing 313 and a second copper sleeve 314 are interference-fitted between the explosion-proof rear cover 26 and the penetration part of the motor shaft 31. The bearings are used to ensure concentricity, reduce friction and wear of the rotating connection parts, and improve the rotational flexibility of the contact parts. The copper sleeves are used to ensure concentric stability and prevent sparks from being generated when rotating parts collide, which can reduce the risk of explosion. The contact surfaces between the first copper sleeve 312 and the motor shaft 31 and the explosion-proof inner shell 2, and between the second copper sleeve 314 and the motor shaft 31 and the explosion-proof rear cover 26 are all set as explosion-proof mating surfaces to ensure the explosion-proof effect. After the rear end of the motor shaft 31 passes through the explosion-proof rear cover 22, a cooling fan 8 is fixedly connected. The cooling fan 8 is located inside the outer shell 1 and is used to dissipate heat and cool the inside of the outer shell 1 when the motor is working.

[0069] refer to Figure 4 and Figure 5In some embodiments, a speed regulating mechanism 6 is installed inside the handle portion 23. The speed regulating mechanism 6 includes a speed regulator 61, a speed regulating button 62 connected to the speed regulator 61, and a reversing push rod 63. The speed regulator 61 is fixedly connected to the handle portion 23 via a switch fixing bracket 28 provided inside the handle portion 23. The speed regulating button 62 is movably sleeved inside a T-shaped threaded ring 64, which is fixedly connected to the handle portion 23. The speed regulating button 62 can extend and retract within the T-shaped threaded ring 64. Both ends of the reversing push rod 63 protrude through the handle portion 23 and the outer casing 1. The contact surfaces between the T-shaped threaded ring 64 and the handle portion 23, and between the reversing push rod 63 and the handle portion 23, are all explosion-proof contact surfaces. The speed of the DC brushless motor 3 can be controlled by the speed controller 61. The speed of the DC brushless motor 3 can be changed in real time by manually adjusting the amount of pressure on the speed control button 61, thereby achieving flexible control of the output torque of the impact wrench. The forward and reverse directions of the DC brushless motor 3 can be adjusted by pressing the reversing push rod 63 from the left and right sides of the housing 1 to meet the tightening or loosening requirements of different bolts.

[0070] refer to Figure 4 In some embodiments, the power supply compartment 24 is equipped with a battery box 9 and an electronic control assembly 7. The electronic control assembly 7 includes a power control board 71 and a battery 72. The power control board 71 is located on the upper part of the battery box 9, and the battery 72 is located inside the battery box 9. The battery 72 can be a lithium manganese oxide battery. The battery 72 is electrically connected to the power control board 71, the speed controller 61, and the brushless DC motor 3 via electrical wires 73. The brushless DC motor 3 can be powered by the battery 72, and the signal is transmitted to the power control board 71 through the on / off state of the switch to control the magnitude of the current entering the coil of the brushless DC motor 3, driving the rotor of the brushless DC motor 3 to rotate. The rotational force is transmitted to the reduction mechanism 4 through the motor shaft 31. The torque of the motor is increased by the set reduction ratio and further transmitted to the T-shaft 53 for output, thereby completing the installation or removal of bolts or nuts.

[0071] refer to Figure 16 and Figure 18 In some embodiments, a gear slot 241 is provided on the side of the power supply compartment 24. A gear shift button 242, a button spring 243, and a keypad 244 are inserted into the gear shift slot 241. One end of the gear shift button 242 extends out of the power supply compartment 24, and the other end is connected to the keypad 244. The two ends of the button spring 243 abut against the gear shift button 242 and the gear slot 241, respectively. The keypad 244 is electrically connected to the power control board 71. The insertion surface between the gear shift button 242 and the gear slot 241 is an explosion-proof mating surface. A retaining ring is also provided between the gear shift button 242 and the side wall of the power supply compartment 24 to limit the axial movement distance of the gear shift button 242. The output torque is adjusted by pressing the gear shift button 242, limiting the maximum output torque at each gear.

[0072] refer to Figure 16 and Figure 17 In some embodiments, the power supply compartment 24 has a power socket 245 on its side, and a DC female connector 246 and a threaded cover 247 are inserted inside the power socket 245. The DC female connector 246 is electrically connected to the battery 72. The bottom end of the explosion-proof inner shell 2 is covered with a base plate 29, which is fixedly connected to the explosion-proof inner shell 2. An explosion-proof mating surface is provided between the base plate 29 and the explosion-proof inner shell 2, and a threaded explosion-proof mating surface is provided between the threaded cover 247 and the power socket 245 to ensure the explosion-proof effect of the threaded mating surface.

[0073] In this utility model, the machine head shell 13, the explosion-proof inner shell 2, the explosion-proof rear cover 26, and the base plate 29 are all made of stainless steel.

[0074] The explosion-proof performance of the handheld impact torque wrench provided by this utility model meets the relevant provisions of GB / T3836.1-2021 "Explosive Atmospheres - Part 1: Equipment - General Requirements" and GB / T3836.2-2021 "Explosive Atmospheres - Part 2: Equipment Protected by Flameproof Enclosures 'd'".

[0075] Regarding the terms "front," "rear," "left," and "right" used in this utility model to describe direction and position, please refer to... Figure 4 For example, the side where the impact mechanism 5 is located during operation is designated as "front," and the side of the DC brushless motor 3 located closer to the operator is designated as "rear." (Refer to...) Figure 3 For example, the side where the left shell 11 is located is called "left", and the side where the right shell 12 is located is called "right".

[0076] When using the explosion-proof handheld impact torque wrench for mining provided by this utility model:

[0077] When the torque wrench is in operation, battery 72 supplies power to brushless DC motor 3. The switching on and off of the switch transmits a signal to the power control board 71, controlling the current entering the coil of brushless DC motor 3. This drives the rotor of brushless DC motor 3 to rotate, transmitting the rotational force through motor shaft 31 to the impact block 52 in the reduction mechanism 4. The set reduction ratio increases the motor's torque and further transmits it to the T-shaft 53 for output, thus completing the tightening and loosening of high-torque bolts or nuts. When the external resistance of the T-shaft 53 is low, the brushless DC motor 3 drives the reduction mechanism 4 to drive the main power shaft 51 to rotate, and the T-shaft 53 rotates normally within the movable groove 521. When the T-shaft 53 experiences significant external resistance during the installation or removal of bolts or nuts, it encounters external resistance in the opposite direction of rotation. The DC brushless motor 3 drives the power spindle 51 to rotate, while the impact block 52 and ball bearings 55 compress the impact spring 54 along the predetermined track of the groove 56. The T-shaft 53 gradually disengages from the impact block 52, and the power spindle 51 continues to rotate. Under the stress of the impact spring 45, it releases kinetic energy, pushing the impact block 52 to extend forward axially and rotate circumferentially, striking the T-shaft 53 in the circumferential direction. This increases the torque of the impact wrench. The stop block 533 of the T-shaft 53 rotates to the movable groove 521 on the other side of the impact block 52. The above process is repeated to achieve torque output, completing the tightening and disassembly of high-torque bolts or nuts.

[0078] 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 mine-use explosion-proof handheld impact torque wrench, comprising a housing (1), characterized in that, The outer shell (1) is provided with an explosion-proof inner shell (2); A DC brushless motor (3) is installed in the upper part of the inner cavity of the explosion-proof inner shell (2). The front end of the motor shaft (31) of the DC brushless motor (3) passes through the explosion-proof inner shell (2) and is connected to a reduction mechanism (4). The front end of the reduction mechanism (4) is connected to an impact mechanism (5). The impact mechanism (5) includes a power spindle (51), a striking block (52), a T-shaped shaft (53), and an impact spring (54). The rear end of the power spindle (51) is connected to a reduction mechanism (4), and the front end of the power spindle (51) is fixedly connected to the T-shaped shaft (53). The front end of the T-shaped shaft (53) extends out of the outer shell (1). The striking block (52) is movably sleeved on the outside of the power spindle (51), and grooves (56) are provided on the connection surfaces of the striking block (52) and the power spindle (51). Ball bearings (55) are movably embedded in the grooves (56). The front end of the impact spring (54) abuts against the striking block (52), and the rear end abuts against the power spindle (51). The striking block (52) has an "8"-shaped movable groove (521) on its front end surface. The T-shaped shaft (53) includes an output shaft (531) and a striking anvil (532) connected to its rear end. The striking anvil (532) can rotate within the movable groove (521).

2. The explosion-proof handheld impact torque wrench for mining as described in claim 1, characterized in that, The striking anvil (532) includes two stops (533) arranged symmetrically along the axis of the output shaft (531). The side of the stops (533) includes a first arc surface (5331), a second arc surface (5332) and a third arc surface (5333) connected in sequence. The movable groove (521) includes two grooves (522) arranged symmetrically along the axis of the striking block (52). The side of the groove (522) includes a first side (5221), a second side (5222), and a third side (5223) connected in sequence. The first side (5221) matches the shape of the first arc surface (5331), and the third side (5223) matches the shape of the third arc surface (5333). When the striking anvil (532) is accommodated in the movable groove (521) and rotates, the second arc surface (5332) abuts against the second side (5222) and rotates along the second side (5222).

3. The explosion-proof handheld impact torque wrench for mining as described in claim 1, characterized in that, The reduction mechanism (4) includes an inner gear ring (41) and at least two planetary gears (42). The rear end of the power spindle (51) is provided with a planetary chuck (511). The planetary gears (42) are embedded in the planetary chuck (511) and mesh with the inner gear ring (41). The front end of the motor shaft (31) is fixedly connected to a motor gear shaft (32). The motor gear shaft (32) is sleeved inside the planetary chuck (511) and meshes with the planetary gears (42). The inner gear ring (41) is fixedly connected to the outer shell (1).

4. The explosion-proof handheld impact torque wrench for mining as described in claim 3, characterized in that, The planetary chuck (511) has an outwardly extending insertion part (512) at its rear end. The front side of the upper part of the explosion-proof inner shell (2) has a main shaft connecting groove (21). The motor gear shaft (32) passes through the main shaft connecting groove (21). The insertion part (512) is sleeved on the outside of the motor gear shaft (32) and inserted into the inside of the main shaft connecting groove (21). An inner bearing (513) is sleeved between the insertion part (512) and the motor gear shaft (32). An outer bearing (514) is sleeved between the insertion part (512) and the inner wall of the main shaft connecting groove (21).

5. The explosion-proof handheld impact torque wrench for mining as described in claim 3, characterized in that, The outer shell (1) includes a left shell (11), a right shell (12) and a head shell (13). The head shell (13) covers the outside of the deceleration mechanism (4) and the impact mechanism (5). The front end of the T-shaped shaft (53) extends out of the head shell (13). The rear opening end of the head shell (13) is fixedly connected to the front end of the explosion-proof inner shell (2). The left shell (11) and the right shell (12) are respectively fitted and covered on the left and right sides of the head shell (13) and the explosion-proof inner shell (2). The left shell (11) is fixedly connected to the explosion-proof inner shell (2), and the right shell (12) is fixedly connected to the explosion-proof inner shell (2).

6. The explosion-proof handheld impact torque wrench for mining as described in claim 5, characterized in that, At least three arc-shaped protrusions (411) are provided on the outer circumferential side of the inner gear ring (41) in the radial direction, and an arc-shaped groove (131) matching the shape of the arc-shaped protrusions (411) is provided on the inner wall surface of the rear port of the head housing (13).

7. The explosion-proof handheld impact torque wrench for mining as described in claim 5, characterized in that, A washer (132) is embedded in the side of the machine head housing (13) that abuts against the striking block (52), and a third bearing (133) and a third copper sleeve (134) are fitted at the joint between the T-shaped shaft (53) and the machine head housing (13).

8. The explosion-proof handheld impact torque wrench for mining as described in claim 1, characterized in that, The explosion-proof inner shell (2) includes an integrally formed motor compartment (22), a handle part (23) and a power supply compartment (24) distributed from top to bottom. The brushless DC motor (3) is located inside the motor compartment (22). The front side of the brushless DC motor (3) is fixedly connected to the front side of the explosion-proof inner shell (2) through the motor fixing plate (25). The rear side of the explosion-proof inner shell (2) is covered with an explosion-proof rear cover (26). A rubber pad (27) is provided between the rear side of the brushless DC motor (3) and the explosion-proof rear cover (26).

9. The explosion-proof handheld impact torque wrench for mining as described in claim 8, characterized in that, The handle part (23) is equipped with a speed regulating mechanism (6). The speed regulating mechanism (6) includes a speed regulator (61), a speed regulator (61) and a speed regulating button (62) and a reversing push rod (63) connected thereto. The speed regulator (61) is fixedly connected to the handle part (23) through a switch fixing bracket (28). The speed regulating button (62) is movably sleeved in a T-shaped threaded ring (64). The T-shaped threaded ring (64) is fixedly connected to the handle part (23). Both ends of the reversing push rod (63) protrude from the handle part (23) and the outer shell (1).

10. The explosion-proof handheld impact torque wrench for mining as described in claim 8, characterized in that, The power supply compartment (24) is equipped with a battery box (9) and an electronic control component (7). The electronic control component (7) includes a power control board (71) and a battery (72). The power control board (71) is located on the upper part of the battery box (9), and the battery (72) is located inside the battery box (9). The battery (72) is electrically connected to the power control board (71), the speed controller (61), and the DC brushless motor (3) through an electrical wire (73).

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