Mining explosion-proof handheld impact type torque wrench

Abstract

The invention 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 mounted 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] The invention relates to the technical field of electric tools for mines, in particular to a flameproof handheld impact torque wrench for mines. Background Art

[0002] A wrench is a commonly used installation and removal tool. It is a hand tool that uses the principle of leverage to twist bolts, screws, nuts and other threaded fasteners such as the openings or holes of bolts or nuts. Common wrenches are mostly electric wrenches to improve the efficiency of bolt unloading and installation. Electric torque wrenches are powered by a power supply or battery, and provide a large torque through a motor to tighten high-strength bolts. They are widely used in various industries for screw installation and removal. They have the characteristics of large torque, faster than manual, and reliable.

[0003] For special working environments such as mines containing methane or explosive coal dust, traditional electric wrenches do not have flameproof and explosion-proof properties. When working, the internal battery or motor is prone to short circuit due to excessive temperature, generating sparks and causing explosions and other safety accidents. In addition, for traditional electric impact wrenches, due to the high impact frequency and high impact force during operation, the metal impact block is also prone to sparks when colliding, which brings the risk of explosion. Therefore, manual wrenches are mostly used for underground operations in mines, but manual work is inefficient, time-consuming and labor-intensive. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a flameproof handheld impact torque wrench for mining, which has good flameproof performance, high safety performance, easy portability, large torque force and high working efficiency when used in special environments such as mines. It can effectively solve the technical problems that the existing electric impact wrenches have small torque and do not have flameproof and explosion-proof performance and cannot be applied to mine environments.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: A technical solution of the present invention provides a flameproof handheld impact torque wrench for mining, comprising a shell, wherein a flameproof inner shell is provided inside the shell; A brushless DC motor is installed on the upper part of the inner cavity of the flameproof inner shell, and a front end of the motor shaft of the brushless DC motor passes through the flameproof inner shell and is connected to a speed reduction mechanism, and a front end of the speed reduction mechanism is connected to an impact mechanism; 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 speed reduction mechanism, 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 connecting surfaces of the striking block and the power spindle, and balls 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. An "8"-shaped movable groove is provided on the front end surface of the striking block, and the T-shaped shaft includes an output shaft and a striking anvil connected to its rear end, and the striking anvil can rotate in the movable groove.

[0006] By adopting the above technical scheme, when working, under the action of the spring stress of the impact spring, the striking block is sleeved on the front end of the power spindle and abuts the T-shaped shaft. At this time, the striking anvil is accommodated in the movable groove, and 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, and the striking anvil rotates in the movable groove; while the power spindle rotates, the ball moves along the groove, thereby pushing the striking block to compress the impact spring backward, and when the striking anvil continues to rotate after leaving the movable groove, the impact spring pushes the striking block forward again under the action of the spring stress, and the ball moves in the opposite direction of the groove, and the striking anvil rotates to the opposite side notch of the movable groove, and the side wall of the movable groove abuts the side of the striking anvil to form an impact in the circumferential direction, thereby enabling the intermittent and continuous striking of the T-shaped shaft in the circumferential direction to be achieved through the reciprocating extension and contraction of the impact block, thereby increasing the output torque.

[0007] In some possible implementations, the striking anvil includes two blocks centrally symmetrically arranged along the axis of the output shaft, and the side surfaces of the blocks include a first arc surface, a second arc surface, and a third arc surface connected in sequence; The movable groove includes two grooves arranged in a central symmetrical manner along the axis of the striking block, and the side surfaces of the groove include a first side surface, a second side surface and a third side surface connected in sequence, the first side surface is consistent with the shape of the first arc surface, and the third side surface is consistent with the shape of the third arc surface, and when the striking anvil is accommodated in the movable groove and rotates, the second arc surface abuts against the second side surface and rotates along the second side surface.

[0008] By setting the side of the block as an arc surface and setting the sides of the two grooves of the movable groove as arc sides matching the shape of the side of the block, the concentricity of the striking anvil when rotating in the movable groove can be ensured, and the continuity of the impact block on the T-shaped shaft can be improved.

[0009] In some possible embodiments, the reduction mechanism includes an inner gear ring and at least two planetary gears, a planetary chuck is provided at the rear end of the power spindle, the planetary gear is embedded in the planetary chuck and meshed with the inner gear ring; the front end of the motor shaft is fixedly connected with a motor gear shaft, the motor gear shaft is sleeved inside the planetary chuck and meshed with the planetary gear, and the inner gear ring is fixedly connected to the housing. The motor gear shaft is driven to rotate by a DC brushless motor, and the motor gear shaft drives the planetary gear to rotate around its own axis through gear transmission while rotating along the inner gear ring, and rotates synchronously with the power spindle fixed with the planetary gear, so that the speed of the high-speed rotating motor shaft is reduced according to the set reduction ratio and transmitted to the power spindle, thereby increasing the output torque of the power spindle, and then transmitted to the T-shaped shaft to achieve high torque output.

[0010] In some possible embodiments, the rear end of the planetary chuck is provided with a plug-in portion extending outward, and a spindle connecting groove is provided on the front side surface of the upper part of the flameproof inner shell, and the motor gear shaft passes through the spindle connecting groove, and the plug-in portion is sleeved on the outside of the motor gear shaft and inserted into the inside of the spindle connecting groove, so that the power spindle is synchronously linked with the motor shaft through the motor gear shaft and the planetary gears, and an inner bearing is sleeved and connected between the plug-in portion and the motor gear shaft, which improves the rotational flexibility between the two and can also prevent the power spindle from moving, thereby ensuring that the power spindle is concentric with the motor shaft; an outer bearing is sleeved and connected between the plug-in portion and the inner wall of the spindle connecting groove, which improves the rotational flexibility between the two and can also prevent the power spindle from moving when the striking block hits the T-shaped shaft, thereby ensuring that the power spindle is concentric with the motor shaft.

[0011] In some possible embodiments, the outer shell includes a left shell, a right shell and a head shell, the head shell cover is arranged on the outside of the deceleration mechanism and the impact mechanism, the front end of the T-shaped shaft extends out of the head shell, the rear opening end of the head shell is fixedly connected to the front end surface of the flameproof inner shell, the left shell and the right shell are respectively fitted on the left and right sides of the head shell and the flameproof inner shell, and the left shell and the flameproof inner shell, as well as the right shell and the flameproof inner shell are fixedly connected.

[0012] In some possible embodiments, at least three arc-shaped protrusions are arranged on the outer circumferential side surface of the inner gear ring in a radial direction, and an arc-shaped groove matching the shape of the arc-shaped protrusions is arranged on the inner wall surface of the rear port of the head shell. The arc-shaped protrusions are engaged in the arc-shaped grooves one by one to achieve a fixed connection between the inner gear ring and the head shell, thereby ensuring that the inner gear ring is fixed when the planetary gear rotates along the inner gear ring, and the center of the circle can be determined by engaging the arc-shaped protrusions with the arc-shaped grooves, thereby improving the concentricity of the rotation of the motor gear shaft and the power spindle during the operation of the reduction mechanism.

[0013] In some possible embodiments, a gasket is embedded in the side of the head shell that abuts the striking block to reduce shock and reduce the wear of the striking block on the head shell. The connecting part between the T-shaped shaft and the head shell is provided with a third bearing and a third copper sleeve to ensure concentric stability and improve the rotation flexibility of the contact part.

[0014] In some possible implementations, the flameproof inner shell includes a motor compartment, a handle portion, and a power supply compartment that are integrally formed and distributed from top to bottom; The brushless DC motor is arranged in the motor compartment, the front side of the brushless DC motor is fixedly connected to the front side of the flameproof inner shell through a motor fixing plate, the rear side of the flameproof inner shell is covered with a flameproof rear cover, and a rubber pad is arranged between the rear side of the brushless DC motor and the flameproof rear cover, and the rubber pad is used to prevent the brushless DC motor from moving back and forth in the flameproof inner shell.

[0015] In some possible embodiments, a speed regulating mechanism is installed in the handle portion, and the speed regulating mechanism includes a speed regulator, a speed regulator and a speed regulating button and a direction changing push rod connected thereto. The speed regulator is fixedly connected to the handle portion through a switch fixing frame, and the speed regulating button is movably sleeved in a T-shaped threaded ring, and the T-shaped threaded ring is fixedly connected to the handle portion, and both ends of the direction changing push rod pass through the handle portion and the outer shell.

[0016] The speed of the brushless DC motor can be controlled by the speed regulator. The speed of the brushless DC motor can be changed in real time by manually adjusting the amplitude of pressing the speed control button, thereby realizing flexible control of the output torque of the impact wrench. The forward and reverse directions of the brushless DC motor can be adjusted by pressing the reversing push rod from the left and right sides of the shell to meet the tightening or loosening rotation requirements of different bolts.

[0017] In some possible implementations, a battery box and an electric control assembly are provided in the power supply compartment, and the electric control assembly includes a power control board and a battery, the power control board is provided on the upper part of the battery box, the battery is provided in the battery box, and the battery is electrically connected to the power control board, the speed regulator, and the DC brushless motor through an electrical conductor. The DC brushless motor is powered by the battery, and a signal is transmitted to the power control board through the on-off switch to control the magnitude of the current entering the DC brushless motor coil, drive the DC brushless motor rotor to rotate, transmit the rotational force to the reduction mechanism through the motor shaft, increase the torque of the motor through the set reduction ratio and further transmit it to the T-shaped shaft output, thereby completing the installation or removal of the bolt or nut.

[0018] The present invention has the following beneficial effects: The flameproof hand-held impact torque wrench for mining provided by the present invention has good flameproof performance, high safety performance, convenient carrying, large torque force, strong impact force, high working efficiency, and can easily unload nuts under the action of impact force. It is suitable for installing or removing large-torque bolts, screws, nuts and other threaded fastening bolts or nuts in special environments such as mines. The present invention is provided with a flameproof inner shell and places DC brushless motors, speed regulators, power control boards, batteries and other electrical components that are prone to short-circuit sparks or explosions in the flameproof inner shell to isolate them from the external mine environment, thereby avoiding the occurrence of fire or explosion in the mine due to short circuit or sparks of electrical components; and also by providing a speed reduction mechanism and an impact mechanism, the torque of the motor is output to the power output shaft in multiples, thereby increasing the working torque of the wrench to complete the disassembly and assembly of large-torque bolts or nuts, and the power transmission efficiency of the speed reduction mechanism and the impact mechanism provided by the present invention is higher, and has a higher synchronous linkage with the motor shaft, thereby ensuring that the impact wrench stably outputs a large torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0020] Figure 1 It is a three-dimensional structural schematic diagram of a mining flameproof handheld impact torque wrench of the present invention; Figure 2 Another three-dimensional structural schematic diagram of the mining flameproof handheld impact torque wrench of the present invention; Figure 3 It is a partially cutaway front view of the explosion-proof hand-held impact torque wrench for mining of the present invention; Figure 4 for Figure 3 Internal structure cross-section along line "AA"; Figure 5 It is a schematic diagram of the cutaway structure of the upper part of the explosion-proof hand-held impact torque wrench for mining of the present invention; Figure 6 for Figure 5 A partial enlarged schematic diagram of the area "B" in the middle; Figure 7 It is a schematic diagram of the partial explosion structure of the mining flameproof handheld impact torque wrench of the present invention; Figure 8 It is a three-dimensional structural schematic diagram of the impact mechanism in the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the T-shaped shaft in the present invention; Fig.10 It is a structural schematic diagram of the rear end surface of the striking block in the present invention; Fig.11 A front view of the front end surface of the striking block of the present invention; Fig.12 It is a structural schematic diagram of the main shaft connecting groove on the flameproof inner shell of the present invention; Fig.13 It is a schematic diagram of the connection structure between the speed reduction mechanism and the impact mechanism in the present invention; Fig.14 It is a schematic diagram of the connection structure between the speed reduction mechanism and the impact mechanism in the machine head shell of the present invention; Fig.15 It is a three-dimensional structural schematic diagram of the head shell in the present invention; Fig.16 It is a rear view of the mining flameproof handheld impact torque wrench of the present invention; Fig.17 for Fig.16 A cross-section of the internal structure along the “CC” line; Fig.18 for Fig.16 Cross-section of the internal structure along line “DD”.

[0021] Description of the numbers in the figure: 1. Shell; 11. Left shell; 12. Right shell; 13. Head shell; 131. Arc-shaped slot; 132. Washer; 133. Third bearing; 134. Third copper sleeve; 2. Flameproof inner shell; 21. Spindle connection slot; 22. Motor compartment; 23. Handle; 24. Power supply compartment; 241. Shift slot; 242. Shift button; 243. Button spring; 244. Keypad; 245. Power socket; 246. DC socket; 247. Threaded cover; 25. Motor fixing plate; 26. Flameproof rear cover; 27. Rubber pad; 28. Switch fixing bracket; 29. ​​Bottom plate; 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; 4. speed reduction mechanism; 41. internal gear ring; 411. arc-shaped convex block; 42. planetary gear; 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. Stopper; 5331. First arc surface; 5332. Second arc surface; 5333. Third arc surface; 54. Impact spring; 55. Ball; 56. Groove; 6. Speed ​​regulating mechanism; 61. Speed ​​regulator; 62. Speed ​​regulating button; 63. Direction changing push rod; 64. T-shaped threaded ring; 7. Electric control components; 71. Power control board; 72. Battery; 73. Electrical wires; 8. Cooling fan; 9. Battery box. DETAILED DESCRIPTION

[0022] The following specific embodiments illustrate the implementation of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, it does not mean that the features of this invention are limited to the implementation.

[0023] In the description of this embodiment, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "front", "back" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the product of the invention is usually placed when used, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to has a specific orientation, is constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. The terms "first", "second" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0024] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0025] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0026] refer to Figures 1 to 7In one embodiment of the present invention, a flameproof handheld impact torque wrench for mining is provided, comprising an outer shell 1, and a flameproof inner shell 2 is provided inside the outer shell 1. The flameproof inner shell 2 is hollow inside, and a DC brushless motor 3 is installed on the upper part of the inner cavity of the flameproof inner shell 2. The front end of the motor shaft 31 of the DC brushless motor 3 passes through the flameproof inner shell 2 and is connected to a speed reduction mechanism 4, and the front end of the speed reduction mechanism 4 is connected to an impact mechanism 5. In this embodiment, the flameproof inner shell 2 is provided to isolate electrical components that are prone to short-circuit sparks or explosions from the external mine environment, thereby achieving a flameproof effect of itself and avoiding the occurrence of dangerous situations such as fire and explosion in the mine due to circuit failures, explosions, etc.

[0027] Specifically, refer to Figure 4 , Figure 5 and Fig.13 The impact mechanism 5 includes a power main shaft 51, a striking block 52, a T-shaped shaft 53 and an impact spring 54. The rear end of the power main shaft 51 is connected to the reduction mechanism 4. The DC brushless motor 3 drives the reduction mechanism 4 to operate through the motor shaft 31. At the same time, the speed is converted by a certain differential ratio of the reduction mechanism 4 and the front end of the power main shaft 51 is driven to rotate coaxially with the motor shaft 31. The front end of the power main shaft 51 is fixedly connected to the T-shaped shaft 53, and the front end of the T-shaped shaft 53 extends out of the housing 1. The striking block 52 is cylindrical and is movably sleeved on the outside of the power main shaft 51. Figure 5 and Figure 6 The connecting surfaces of the striking block 52 and the power spindle 51 are both provided with a spiral concave groove 56, and the groove 56 on the power spindle 51 extends in a spiral line around the axis of the power spindle 51. The groove 56 on the striking block 52 matches the groove 56 on the power spindle 51, and a ball 55 is movably embedded in the groove 56, and the ball 55 can roll along the groove 56 (this part is a relatively mature technology and will not be repeated here). The front end of the impact spring 54 abuts the striking block 52, and the rear end abuts the planetary chuck 511 at the rear end of the power spindle 51.

[0028] refer to Figures 8 to 11 An active groove 521 in the shape of an "8" is provided on the front end surface of the striking block 52. 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, and the striking anvil 532 can rotate in the active groove 521.

[0029] Further, refer to Fig. 9 The striking anvil 532 includes two blocks 533 that are centrally symmetrically arranged along the axis of the output shaft 531, and the side surface of the block 533 includes a first arc surface 5331, a second arc surface 5332 and a third arc surface 5333 that are connected in sequence. Figure 8 and Fig.11 The movable groove 521 includes two grooves 522 arranged symmetrically along the axis of the striking block 52, and the side surfaces of the grooves 522 include a first side surface 5221, a second side surface 5222 and a third side surface 5223 connected in sequence. The first side surface 5221 matches the shape of the first arc surface 5331, and the third side surface 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 surface 5222 and rotates along the second side surface 5222. By setting the side surface of the stopper 533 as an arc surface, and setting the side surfaces of the two grooves 522 of the movable groove 521 as arc-shaped side surfaces matching the shape of the side surface of the stopper 533, the concentricity of the striking anvil 532 when rotating in the movable groove 521 can be ensured, and the striking continuity of the impact block 52 on the T-shaped shaft 53 can be improved. The rotation angle of the stopper 533 in the groove 522 is 90 to 130 degrees. Preferably, the rotation angle of the stopper 533 in the groove 522 is set to 100-120 degrees.

[0030] refer to Figure 5 and Fig.10 A U-shaped groove 523 is provided on the side wall of the striking block 52, the opening of the U-shaped groove 523 is located on the rear end surface of the striking block 52, and the impact spring 54 is sleeved in the U-shaped groove 523. The U-shaped groove 523 is provided to install the impact spring 54, so as to prevent the stability of the installation position of the impact spring 54 and prevent the impact spring 54 from being twisted and deformed during compression or rebound reset.

[0031] When the impact wrench of this embodiment is working, 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, and the DC brushless motor 3 drives the motor shaft 31 to rotate and transmits the power to the power spindle 51 through the dynamic reduction mechanism 4, thereby driving the T-shaped shaft 53 to rotate and output torque, and the striking anvil 532 rotates in the movable groove 521; while the power spindle 51 rotates, the ball 55 moves along the groove 56, thereby pushing the striking block 52 compresses the impact spring 54 backwards, and when the striking anvil 532 disengages from the movable groove 521 and continues to rotate, the impact spring 54 pushes the striking block 52 forward again under the action of spring stress, and the ball 55 moves in the opposite direction along the groove 56, and the striking anvil 532 rotates to the opposite side groove 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. As a result, the T-shaped shaft 53 can be intermittently and continuously struck in the circumferential direction by the reciprocating extension and contraction of the impact block 52, thereby increasing the output torque.

[0032] refer to Figure 1 and 4In some embodiments, the housing 1 includes a left housing 11, a right housing 12 and a head housing 13, the head housing 13 is covered outside the speed reduction mechanism 4 and the impact mechanism 5, the front end of the T-shaped shaft 53 extends out of the head housing 13, and the rear opening end of the head housing 13 is fixedly connected to the front end surface of the flameproof inner housing 2 by bolts. The left housing 11 and the right housing 12 are respectively fitted and covered on the left and right sides of the head housing 13 and the flameproof inner housing 2, and the left housing 11 and the flameproof inner housing 2, and the right housing 12 and the flameproof inner housing 2 are fixedly connected by screws, and the screw connection is a threaded flameproof joint surface.

[0033] refer to Fig.13 and Fig.14 In some embodiments, the speed reduction mechanism 4 includes an inner 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 spindle 51. The planetary gears 42 are embedded in the planetary chuck 511 and meshed with the inner gear ring 41. Figure 4 The front end of the motor shaft 31 is fixedly connected with a motor gear shaft 32, which is sleeved inside the planetary chuck 511 and meshed with the planetary gear 42, and the inner gear ring 41 is fixedly connected to the housing 1. The motor gear shaft 32 is driven to rotate by the DC brushless motor 3, and the motor gear shaft 32 drives the planetary gear 42 to rotate around its own axis through gear transmission and rotates along the inner gear ring 41, and rotates synchronously with the power spindle 51 fixed with the planetary gear 42, so that the speed of the high-speed rotating motor shaft 31 is reduced according to the set reduction ratio and transmitted to the power spindle 51, thereby increasing the output torque of the power spindle 51, and then transmitting it to the T-shaped shaft 53 to achieve high torque output. Among them, the reduction ratio of the reduction mechanism 4 is controlled at 90~100:1, and the output torque of the explosion-proof handheld impact torque wrench for mining in the present invention can be controlled at 200~350N·m.

[0034] refer to Figure 6 , Fig.12 and Fig.13 In some embodiments, the rear end of the planetary chuck 511 is provided with an outwardly extending plug-in portion 512, the front side surface of the upper part of the flameproof inner shell 2 is provided with a spindle connecting groove 21, the motor gear shaft 32 penetrates the spindle connecting groove 21, and the plug-in portion 512 is sleeved on the outside of the motor gear shaft 32 and inserted into the inside of the spindle connecting groove 21, so that the power spindle 51 is synchronously linked with the motor shaft 31 through the motor gear shaft 32 and the planetary gear 42. Reference Figure 4 and Figure 5An inner bearing 513 is sleeved and connected between the plug-in portion 512 and the motor gear shaft 32, which improves the rotational flexibility between the two and can also prevent the power spindle 51 from moving, thereby ensuring that the power spindle 51 is concentric with the motor shaft 31; an outer bearing 514 is sleeved and connected between the plug-in portion 512 and the inner wall of the spindle connecting groove 21, which improves the rotational flexibility between the two and can also prevent the power spindle 51 from moving when the striking block 52 hits the T-shaped shaft 53, thereby ensuring that the power spindle 51 is concentric with the motor shaft 31.

[0035] refer to Figures 13 to 15 In some embodiments, at least three arc-shaped protrusions 411 are arranged on the outer circumferential side surface 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 arranged on the inner wall surface of the rear port of the head shell 13. The inner gear ring 41 and the head shell 13 are fixedly connected by the arc-shaped protrusions 411 being engaged in the arc-shaped grooves 131 one by one, so as to ensure that the inner gear ring 41 is fixed when the planetary gear 42 rotates along the inner gear ring 41, and the arc-shaped protrusions 411 are engaged in the arc-shaped grooves 131 to determine the center of the circle, thereby improving the concentricity of the rotation of the motor gear shaft 32 and the power main shaft 51 during the operation of the speed reduction mechanism 4.

[0036] refer to Figure 4 and Figure 5 In some embodiments, a washer 132 is embedded in the side of the head shell 13 that abuts against the striking block 52 to reduce shock and reduce the wear of the striking block 52 on the head shell 13. The connecting part between the T-shaped shaft 53 and the head shell 13 is provided with a third bearing 133 and a third copper sleeve 134 to ensure concentric stability and improve the rotation flexibility of the contact part.

[0037] refer to Figure 4 and Figure 7 In some embodiments, the flameproof inner shell 2 includes a motor compartment 22, a handle portion 23, and a power supply compartment 24 that are integrally formed and distributed from top to bottom. The brushless DC motor 3 is disposed in the motor compartment 22, and the front side of the brushless DC motor 3 is fixedly connected to the front side of the flameproof inner shell 2 through a motor fixing plate 25, and a flameproof rear cover 26 is provided on the rear side of the flameproof inner shell 2. A rubber pad 27 is provided between the rear side of the brushless DC motor 3 and the flameproof rear cover 26, and the rubber pad 27 is used to prevent the brushless DC motor 3 from moving back and forth in the flameproof inner shell 2. A flameproof joint surface is provided between the flameproof rear cover 26 and the flameproof inner shell 2 to improve the flameproof effect. Reference Figure 5The first bearing 311 and the first copper sleeve 312 are sleeved with interference fit between the front side of the flameproof inner shell 2 and the connection part of the motor shaft 31, and the second bearing 313 and the second copper sleeve 314 are sleeved with interference fit between the flameproof rear cover 26 and the connection part of the motor shaft 31. The bearing is used to ensure concentricity, reduce friction and wear of the rotating connection part, and improve the rotation flexibility of the contact part. The copper sleeve is used to ensure concentricity and prevent sparks from being generated when the rotating parts collide, which can reduce the risk of explosion. The contact surface between the first copper sleeve 312 and the motor shaft 31 and the flameproof inner shell 2, and the contact surface between the second copper sleeve 314 and the motor shaft 31 and the flameproof rear cover 26 are all set as flameproof joint surfaces to ensure the flameproof effect. The rear end of the motor shaft 31 passes through the flameproof rear cover 22 and is fixedly connected with a heat dissipation fan 8. The heat dissipation fan 8 is arranged inside the outer shell 1 to dissipate heat and cool the inside of the outer shell 1 when the motor is working.

[0038] refer to Figure 4 and Figure 5 In some embodiments, a speed regulating mechanism 6 is installed in the handle portion 23, and the speed regulating mechanism 6 includes a speed regulator 61, a speed regulator 61, a speed regulating button 62 and a direction changing push rod 63 connected thereto. The speed regulator 61 is fixedly connected to the handle portion 23 through a switch fixing frame 28 provided in the handle portion 23, and the speed regulating button 62 is movably sleeved in a T-shaped threaded ring 64, which is fixedly connected to the handle portion 23. The speed regulating button 62 can be extended and retracted in the T-shaped threaded ring 64, and both ends of the direction changing push rod 63 pass through the handle portion 23 and the housing 1. The interfacing surfaces between the T-shaped threaded ring 64 and the handle portion 23 and between the direction changing push rod 63 and the handle portion 23 are both set as flameproof joint surfaces. The speed of the brushless DC motor 3 can be controlled by the speed regulator 61. The speed of the brushless DC motor 3 can be changed in real time by manually adjusting the amplitude of pressing the speed regulating button 61, thereby realizing flexible control of the output torque of the impact wrench. The forward and reverse directions of the brushless DC 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 rotation requirements of different bolts.

[0039] refer to Figure 4In some embodiments, a battery box 9 and an electric control assembly 7 are provided in the power supply compartment 24. The electric control assembly 7 includes a power control board 71 and a battery 72. The power control board 71 is provided on the upper part of the battery box 9, and the battery 72 is provided in the battery box 9. The battery 72 can be a lithium manganese oxide battery, and the battery 72 is electrically connected to the power control board 71, the speed regulator 61 and the DC brushless motor 3 through an electrical conductor 73. The DC brushless motor 3 can be powered by the battery 72, and a signal is transmitted to the power control board 71 by turning on and off the switch to control the magnitude of the current entering the coil of the DC brushless motor 3, drive the rotor of the DC brushless motor 3 to rotate, and transmit the rotational force to the speed reduction mechanism 4 through the motor shaft 31. The torque of the motor is increased by the set speed reduction ratio and further transmitted to the T-shaped shaft 53 for output, thereby completing the installation or removal of the bolts or nuts.

[0040] refer to Fig.16 and Fig.18 In some embodiments, a gear slot 241 is provided on the side of the power supply compartment 24, and a gear shift button 242, a button spring 243 and a key plate 244 are inserted in the gear 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 key plate 244. The two ends of the button spring 243 respectively abut against the gear shift button 242 and the gear slot 241, and the key plate 244 is electrically connected to the power control board 71. The plug-in surface between the gear shift button 242 and the gear slot 241 is a flameproof joint surface. A spring 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 to limit the maximum output torque under each gear.

[0041] refer to Fig.16 and Fig.17 In some embodiments, a power socket 245 is provided on the side of the power supply compartment 24, a DC socket 246 and a threaded cover 247 are inserted inside the power socket 245, and the DC socket 246 is electrically connected to the battery 72. The bottom end cover of the flameproof inner shell 2 is provided with a bottom plate 29, the bottom plate 29 is fixedly connected to the flameproof inner shell 2, a flameproof joint surface is provided between the bottom plate 29 and the flameproof inner shell 2, and a threaded flameproof joint surface is provided between the threaded cover 247 and the power socket 245 to ensure the flameproof effect of the threaded joint surface.

[0042] In the present invention, the head shell 13, the flameproof inner shell 2, the flameproof rear cover 26 and the bottom plate 29 are all made of stainless steel.

[0043] The explosion-proof performance of the handheld impact torque wrench provided by the present invention complies with the relevant provisions of standards GB / T3836.1-2021 "Explosive Environment Part 1: General Requirements for Equipment" and GB / T3836.2-2021 "Explosive Environment Part 2: Equipment Protected by Flameproof Enclosure "d"".

[0044] Regarding the terms "front", "rear", "left", "right" and so on describing directions and positions in the present invention, refer to Figure 4 For example, the working operation side where the impact mechanism 5 is located is the "front", and the side close to the operator where the DC brushless motor 3 is located is the "rear"; Figure 3 For example, the side where the left shell 11 is located is referred to as “left”, and the side where the right shell 12 is located is referred to as “right”.

[0045] The flameproof hand-held impact torque wrench provided by the present invention is used when: When the torque wrench is working, the battery 72 supplies power to the brushless DC motor 3, transmits a signal to the power control board 71 by turning on and off the switch, controls the magnitude of the current entering the coil of the brushless DC motor 3, drives the rotor of the brushless DC motor 3 to rotate, transmits the rotational force to the impact block 52 in the speed reduction mechanism 4 through the motor shaft 31, increases the torque of the motor through the set speed reduction ratio and further transmits it to the T-shaped shaft 53 for output, thereby completing the tightening and removal of high-torque bolts or nuts. When the external resistance of the T-shaped shaft 53 is small, the brushless DC motor 3 drives the speed reduction mechanism 4 to drive the power spindle 51 to rotate, and the T-shaped shaft 53 rotates normally in the movable groove 521. When the T-shaped shaft 53 is subjected to a large external resistance when disassembling bolts or nuts, the T-shaped shaft 53 is subjected to an external resistance in the reverse rotation direction, and the DC brushless motor 3 drives the power spindle 51 to rotate. At the same time, the impact block 52 and the ball 55 compress the impact spring 54 backward along the predetermined track of the groove 56, and the T-shaped shaft 53 gradually loses contact with the impact block 52. The power spindle 51 continues to rotate, and releases kinetic energy under the stress of the impact spring 45, pushing the impact block 52 to extend forward axially and rotate circumferentially, hitting the T-shaped shaft 53 in the circumferential direction, thereby increasing the torque of the impact wrench, and the stopper 533 of the T-shaped shaft 53 rotates to the movable groove 521 on the other side of the impact block 52, and repeats the above process to realize torque output, thereby completing the tightening and disassembly of high-torque bolts or nuts.

[0046] Although the preferred embodiments of the present invention have been disclosed as above, they are not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solutions of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the contents of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A flameproof handheld impact torque wrench for mining, comprising a housing (1), characterized in that: A flameproof inner shell (2) is provided inside the outer shell (1); A brushless DC motor (3) is installed at the upper part of the inner cavity of the flameproof inner shell (2); the front end of the motor shaft (31) of the brushless DC motor (3) passes through the flameproof inner shell (2) and is connected to a speed reduction mechanism (4); the front end of the speed reduction mechanism (4) is connected to an impact mechanism (5); The impact mechanism (5) comprises a power main shaft (51), a striking block (52), a T-shaped shaft (53) and an impact spring (54); the rear end of the power main shaft (51) is connected to the speed reduction mechanism (4); the front end of the power main shaft (51) is fixedly connected to the T-shaped shaft (53); the front end of the T-shaped shaft (53) extends out of the housing (1); the striking block (52) is movably sleeved on the outside of the power main shaft (51); grooves (56) are provided on the connecting surfaces of the striking block (52) and the power main shaft (51); a ball (55) is movably embedded in the groove (56); the front end of the impact spring (54) abuts against the striking block (52) and the rear end abuts against the power main shaft (51); An "8"-shaped movable groove (521) is provided on the front end surface of the striking block (52); the T-shaped shaft (53) comprises an output shaft (531) and a striking anvil (532) connected to its rear end; the striking anvil (532) is rotatable in the movable groove (521).

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

3. The explosion-proof handheld impact torque wrench for mining according to claim 1, characterized in that: The speed reduction mechanism (4) comprises an internal gear ring (41) and at least two planetary gears (42); a planetary chuck (511) is provided at the rear end of the power main shaft (51); the planetary gears (42) are embedded in the planetary chuck (511) and meshedly connected with the internal gear ring (41); the front end of the motor shaft (31) is fixedly connected with a motor gear shaft (32); the motor gear shaft (32) is sleeved inside the planetary chuck (511) and meshedly connected with the planetary gears (42); and the internal gear ring (41) is fixedly connected to the housing (1).

4. The explosion-proof hand-held impact torque wrench for mining according to claim 3, characterized in that: The rear end of the planetary chuck (511) is provided with an outwardly extending plug-in portion (512), the front side surface of the upper portion of the flameproof inner shell (2) is provided with a spindle connecting groove (21), the motor gear shaft (32) penetrates the spindle connecting groove (21), the plug-in portion (512) is sleeved on the outside of the motor gear shaft (32) and inserted into the inside of the spindle connecting groove (21), an inner bearing (513) is sleeved and connected between the plug-in portion (512) and the motor gear shaft (32), and an outer bearing (514) is sleeved and connected between the plug-in portion (512) and the inner wall of the spindle connecting groove (21).

5. The explosion-proof hand-held impact torque wrench for mining according to claim 3, characterized in that: The housing (1) comprises a left housing (11), a right housing (12) and a head housing (13); the head housing (13) is arranged outside the speed reduction mechanism (4) and the impact mechanism (5); the front end of the T-shaped shaft (53) extends out of the head housing (13); the rear opening end of the head housing (13) is fixedly connected to the front end surface of the flameproof inner housing (2); the left housing (11) and the right housing (12) are respectively arranged on the left and right sides of the head housing (13) and the flameproof inner housing (2); the left housing (11) and the flameproof inner housing (2) are fixedly connected, and the right housing (12) and the flameproof inner housing (2) are fixedly connected.

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

7. The explosion-proof hand-held impact torque wrench for mining according to claim 5, characterized in that: A washer (132) is embedded in the side surface of the machine head shell (13) that contacts the striking block (52), and a third bearing (133) and a third copper sleeve (134) are sleeved on the connecting portion between the T-shaped shaft (53) and the machine head shell (13).

8. The explosion-proof hand-held impact torque wrench for mining according to claim 1, characterized in that: The flameproof inner shell (2) comprises a motor compartment (22), a handle portion (23) and a power supply compartment (24) which are integrally formed and arranged from top to bottom; The brushless DC motor (3) is arranged in a motor compartment (22); the front side of the brushless DC motor (3) is fixedly connected to the front side of the flameproof inner casing (2) via a motor fixing plate (25); a flameproof rear cover (26) is provided on the rear side of the flameproof inner casing (2); and a rubber pad (27) is provided between the rear side of the brushless DC motor (3) and the flameproof rear cover (26).

9. The explosion-proof hand-held impact torque wrench for mining according to claim 8, characterized in that: A speed regulating mechanism (6) is installed in the handle portion (23), and the speed regulating mechanism (6) comprises a speed regulator (61), a speed regulating button (62) and a direction-changing push rod (63) connected thereto, the speed regulator (61) being fixedly connected to the handle portion (23) via a switch fixing frame (28), the speed regulating button (62) being movably sleeved in a T-shaped threaded ring (64), the T-shaped threaded ring (64) being fixedly connected to the handle portion (23), and both ends of the direction-changing push rod (63) passing through the handle portion (23) and the housing (1).

10. The explosion-proof hand-held impact torque wrench for mining according to claim 8, characterized in that: A battery box (9) and an electric control assembly (7) are provided in the power supply compartment (24); the electric control assembly (7) comprises a power control board (71) and a battery (72); the power control board (71) is provided on the upper part of the battery box (9); the battery (72) is provided in the battery box (9); and the battery (72) is electrically connected to the power control board (71), the speed regulator (61) and the brushless DC motor (3) via an electrical conductor (73).

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