Torque wrench

Abstract

The invention provides a torque wrench. The torque wrench comprises a motor assembly, a gearbox assembly, a tooth cylinder assembly, a sleeve assembly and a controller. The controller sets a torque value, and the motor drives the gearbox to rotate and drives a planet gear in the gear cylinder assembly to operate, so that the sleeve is driven to rotate, and it is ensured that the wrench can output torque accurately. A self-locking device is arranged in the sleeve assembly, a drill bit is placed in the self-locking device, self-locking is achieved by extruding the drill bit through a steel ball, and the installation efficiency is improved. After the operation is completed, torque data generated by screwing is stored in a controller; by means of the mode, the torque output by the torque wrench can be better controlled, real-time transmission of screwing data can be achieved, the data can be exported in an off-line mode under the condition that network signals are poor, and data support is provided for visually displaying the screwing condition.

Description

TECHNICAL FIELD

[0001] The present application relates to a torque wrench, in particular to a torque wrench for tightening high-strength bolts and recording the tightening data, and belongs to the technical field of torque wrenches and intelligent construction of steel structures. BACKGROUND

[0002] High-strength bolts are increasingly widely used in engineering, especially in steel structure bridge construction, and high-strength bolt connection is widely used. How to control the quality of high-strength bolt tightening on steel structure bridges has become the key to controlling the quality of steel structure bridges. The main role of high-strength bolts in steel structures is to connect members with axial force, and the tightening axial force is a typical field data. In the tightening of high-strength bolts in steel structures, the most important thing is to ensure that all high-strength bolts are tightened to the closest design axial force. Excessive axial force (i.e. over-tightening) will cause the bolt to break or break after a period of time (i.e. delayed fracture); the low axial force (i.e. under-tightening) will cause hidden dangers to the safety of the structure.

[0003] In the past mode, after the completion of the three-dimensional model modeling, only the global hard collision check is carried out, and the soft collision check of the bolt tightening position is not carried out, which causes the bolt to be unable to extend into the construction during the field tightening, and the responsible site personnel will temporarily make special tooling to complete the tightening work, and in some cases, even the construction difficulty is large and the situation of stealing and reducing materials occurs, causing unnecessary waste of manpower and material resources and even quality problems; when the bolt is tightened, the axial force is mainly realized by the torque wrench, and the common torque wrench controls the output torque by controlling the input current and voltage. The output torque cannot be set in advance and must be calibrated before construction, and the construction record also needs to be manually filled out by a special person, which affects the work efficiency, and the data reliability and traceability are also poor, which cannot meet the increasingly high requirements of the owner.

[0004] Therefore, it is necessary to provide a torque wrench capable of fixing the output torque, quickly replacing the drill bit, and storing and uploading real-time data to solve this problem. SUMMARY

[0005] The purpose of the present application is to provide a torque wrench, which locks the drill bit by a self-locking device, and then outputs power by a motor, and transmits the power to the planetary gear through the gearbox to generate torque. The controller can accurately control the rotation, steering and other functions of the torque wrench, and can record or transmit the torque record in real time, improve the control accuracy and response speed, and make the operation of the torque wrench more sensitive and accurate.

[0006] To achieve the above objectives, the present invention provides a torque wrench comprising a motor assembly, a gearbox assembly, a gear cylinder assembly, and a sleeve assembly. The main body of the motor assembly is a motor housing, and a controller and a battery are mounted at the rear of the motor housing. The gearbox assembly is connected to the top of the motor assembly, the gear cylinder assembly is placed at the bottom of the gearbox assembly, and the sleeve assembly is connected to the rear of the gear cylinder assembly.

[0007] The motor assembly includes the motor housing, a motor camshaft housing is installed on the top of the motor housing, a gear ring and a double-layered bore spiral retaining ring a are installed in the motor camshaft housing, and a bearing washer and a deep groove ball bearing a are placed at the tail of the camshaft.

[0008] The external gearbox assembly consists of a gearbox cover plate connected to a motor connection flange via hexagonal head screws and locating pins. A connecting device then connects the motor connection flange to the motor assembly. Internally, the gearbox assembly consists of a motor connection shaft connected to a camshaft. A gear is mounted on top of the motor connection shaft and meshes with a gear mounted on a transmission gear shaft. A deep groove ball bearing b is mounted on top of the transmission gear shaft. A cylindrical gear b is placed between the deep groove ball bearing b and the gear. The cylindrical gear b meshes with a cylindrical gear a, which is mounted on an input shaft. A deep groove ball bearing b is mounted on top of the input shaft.

[0009] The gear cylinder assembly includes a gear cylinder, a first-stage assembly, a second-stage assembly, a third-stage assembly, and a copper sleeve. A type A elastic retaining ring for the bore is installed on the upper part of the gear cylinder. The gear at the tail of the input shaft meshes with the first-stage planetary gear in the first-stage assembly. The gear at the tail of the first-stage assembly meshes with the second-stage planetary gear in the second-stage assembly. The gear at the tail of the second-stage assembly meshes with the third-stage planetary gear in the third-stage assembly. The third-stage planetary gear carrier is connected to the copper sleeve. The type A elastic retaining ring for the bore is installed at the tail of the copper sleeve.

[0010] The three-stage assembly includes a three-stage planetary gear, a three-stage planetary gear carrier, and a double-layered helical retaining ring b. The three-stage planetary gear is placed in the frame of the three-stage planetary gear carrier, and the double-layered helical retaining ring b is installed on top of the three-stage planetary gear carrier. The two-stage assembly includes a two-stage planetary gear, a two-stage planetary gear carrier, and a single-layered helical retaining ring. The two-stage planetary gear is placed in the frame of the two-stage planetary gear carrier, and the single-layered helical retaining ring is installed on top of the two-stage planetary gear carrier. The one-stage assembly includes a one-stage planetary gear, a one-stage planetary gear carrier, and a single-layered helical retaining ring. The one-stage planetary gear is placed in the frame of the one-stage planetary gear carrier, and the single-layered helical retaining ring is installed on top of the one-stage planetary gear carrier. The sleeve contains the self-locking device.

[0011] The sleeve assembly includes a reaction arm sleeve. The sleeve is inserted into the reaction arm sleeve and the reaction arm sleeve is fixed with a hexagonal socket head cap screw. A copper sleeve is placed on the sleeve. A type B elastic retaining ring is placed at the bottom of the sleeve. The reaction arm plate is placed on the side of the sleeve.

[0012] The self-locking device includes a housing a, the tail of which is connected to the sleeve. Inside the housing a, a slot and a slider are placed in sequence. The top of the slot has a square buckle. A locking ring is placed on the upper part of the slider. A spring a is placed between the slider and the locking ring. A spring b is installed at the bottom of the slider.

[0013] The top of the self-locking device is connected to the lock head, the bottom of the lock head is connected to the lock handle and the cotter pin, the steel ball is placed in the lock handle, the bottom of the movable sleeve is placed with spring c, the movable sleeve is installed on both sides with the steel ball, and the sleeve b is placed on the lock handle.

[0014] The controller has a human-machine interface: 1. Set the torque value: After installing the battery, press the switch to turn on the controller. M1 mode is torque mode. Press the M button, then use the ↑ or ↓ arrows to increase or decrease the torque value. Press the M button again to complete the torque setting.

[0015] 2. Data Upload: (1) Offline Export: After completing the on-site work, use the ↑ and ↓ arrow keys simultaneously on the human-machine interface to enter the Record interface, and then use the M key to confirm. Next, use a computer to open the relevant software and connect the torque wrench. After successful connection, select the upload option in the controller to upload the data stored in the controller; (2) Real-time transmission: At the work site, before the operation, press the ↑↓ arrows on the human-machine interface, select the Record interface, press the M key to confirm, open the software on the computer to connect the torque wrench, press the switch to start the operation, and the data will be transmitted in real time.

[0016] The operation of a torque wrench self-locking device includes the following steps: Step 1: First, connect the lock head to the square latch on the top of the self-locking device with a cotter pin. Press down the sleeve b, and the movable sleeve will be pressed under the steel ball to unlock the lock head. After the lock head is unlocked, insert the drill bit, release the sleeve b, and the sliding sleeve will pop up, pressing the steel ball into the lock handle to lock the drill bit, thus completing the locking. Step 2: While pressing down on the housing b, the square latch pushes the slot to slide down, and the compression locking ring drives the slider to retract downward until the cotter pin, at which point the square latch and housing a are completely locked together. Step 3: After completing the work, press the casing b to remove the drill bit. The lock head can be pulled out directly, making it easy to replace the lock head. After the lock head is pulled out, the self-locking device will restore it to its initial state through springs a and b.

[0017] Compared with related technologies, the beneficial effects of the present invention are as follows: (1) The present invention achieves precise control of torque wrench to generate torque by meshing the gears of the first-level assembly, second-level assembly and third-level assembly of the gearbox assembly and gear cylinder assembly, thereby improving transmission stability. (2) The present invention uses a self-locking device, which can achieve self-locking through steel balls and movable sleeve, cotter pin and square lock buckle, so that the drill bit can be quickly installed into the wrench and the drill bit can be kept stable during operation; (3) This invention optimizes the shape of the handle and the gripping area to better suit the human hand's gripping posture, thereby improving gripping comfort and stability and effectively reducing hand fatigue. Furthermore, by rationally adjusting the center of gravity distribution of the torque wrench, the operation process becomes easier and more comfortable. (4) By adding a reaction arm plate, the present invention reduces tool offset or vibration caused by reaction force, ensures that the applied torque value is closer to the set target, reduces the operator's operating difficulty and fatigue, and can extend the tool's service life. (5) This invention uses BIM technology with a controller to effectively record bolt tightening data, providing a basis for bolt tightening inspection and rework, thereby improving project quality; Attached Figure Description Figure 1 This is a three-dimensional schematic diagram of the torque wrench of the present invention; Figure 2 This is an exploded schematic diagram of the motor assembly of the torque wrench of the present invention. Figure 3 This is an exploded schematic diagram of the gearbox assembly of the torque wrench of the present invention. Figure 4 This is an exploded schematic diagram of the toothed cylinder assembly of the torque wrench of the present invention. Figure 5 This is a three-dimensional schematic diagram of the first-stage assembly of the torque wrench of the present invention; Figure 6 This is a three-dimensional schematic diagram of the two-stage assembly of the torque wrench of the present invention; Figure 7 This is a three-dimensional schematic diagram of the three-stage assembly of the torque wrench of the present invention; Figure 8 This is a exploded schematic diagram of the socket assembly of the torque wrench of the present invention. Figure 9 This is a three-dimensional cross-sectional schematic diagram of the self-locking device of the torque wrench of the present invention in the locked state; Figure 10This is a three-dimensional cross-sectional schematic diagram of the self-locking device of the torque wrench of the present invention in its initial state; Figure 11 This is a schematic diagram showing the explosion of the locking head of the self-locking device of the torque wrench of the present invention. Figure 12 This is a technical roadmap for the torque wrench of the present invention; The markings in the image are as follows: 1-Motor assembly, 101-Battery, 102-Motor housing, 103-Motor camshaft housing, 104-Deep groove ball bearing a, 105-Gear ring, 106-Bearing gasket, 107-Double-layer helical retaining ring a, 108-Camshaft, 109-Controller, 2-Gearbox assembly, 201-Gearbox cover plate, 202-Hex socket head cap screw, 203-Motor connecting flange, 204-Deep groove ball bearing b, 205-Spiral gear a, 206-Double-layer helical retaining ring b, 207-Locating pin, 208-Spiral gear b, 209-Gear, 210-Motor connecting shaft, 211-Transmission gear shaft, 3-Gear cylinder assembly, 301-Gear cylinder, 302-Bore elastic retaining ring A-type, 303-Deep groove ball bearing c, 304-Input shaft, 305-Copper sleeve, A-1 grade assembly Assembly, B-2 level assembly, C-3 level assembly, 306-3 level planetary gear, 307-3 level planetary gear carrier, 308-2 level planetary gear, 309-single-layer helical retaining ring for single-layer holes, 310-2 level planetary gear carrier, 311-1 level planetary gear, 312-1 level planetary gear carrier, 4-sleeve assembly, 401-reaction arm sleeve, 402-sleeve copper sleeve, 403-sleeve, 404-hole assembly Type B elastic retaining ring, 405-reaction arm plate, 406-internal hexagonal socket set screw, 5-self-locking device, 501-cotter pin, 502-square lock buckle, 503-casing a, 504-locking ring, 505-slot, 506-slider, 507-spring a, 508-spring b, 509-casing b, 510-moving sleeve, 511-spring c, 512-steel ball, 513-lock handle. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0019] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0020] like Figure 1 It includes a motor assembly 1, a gearbox assembly 2, a gear cylinder assembly 3, and a sleeve assembly 4. The main body of the motor assembly 1 is a motor housing 102. The rear of the motor housing 102 is equipped with a controller 109 and a battery 101. The gearbox assembly 2 is connected to the top of the motor assembly 1. The gear cylinder assembly 3 is placed at the bottom of the gearbox assembly 2. The sleeve assembly 4 is connected to the rear of the gear cylinder assembly 3.

[0021] like Figure 2 The motor assembly 1 includes a motor housing 102, a motor camshaft housing 103 is mounted on the top of the motor housing 102, a gear ring 105 and a double-hole spiral retaining ring a107 are mounted in the motor camshaft housing 103, and a bearing washer 106 and a deep groove ball bearing a104 are placed at the tail of the camshaft 108.

[0022] like Figure 3 The gearbox assembly 2 externally connects the gearbox cover plate 201 to the motor connection flange 203 via hexagon socket head cap screws 202 and locating pins 207, and connects the motor connection flange 203 to the motor assembly 1 via a connecting device. The gearbox assembly 2 is internally connected to the camshaft 108 via a motor connecting shaft 210. A gear 209 is mounted on the top of the motor connecting shaft 210 and meshes with a gear 209 mounted on the transmission gear shaft 211. A deep groove ball bearing b204 is mounted on the top of the transmission gear shaft 211. A cylindrical gear b208 is placed between the deep groove ball bearing b204 and the gear 209. The cylindrical gear b208 meshes with a cylindrical gear a205. The cylindrical gear a205 is mounted on the input shaft 304. A deep groove ball bearing b204 is mounted on the top of the input shaft 304.

[0023] like Figure 4 The gear cylinder assembly 3 includes a gear cylinder 301, a first-stage assembly A, a second-stage assembly B, a third-stage assembly C, and a copper sleeve 305. A type A elastic retaining ring 302 for holes is installed on the upper part of the gear cylinder 301. The gear at the tail of the input shaft 304 meshes with the first-stage planetary gear 311 in the first-stage assembly A. The gear at the tail of the first-stage assembly A meshes with the second-stage planetary gear 308 in the second-stage assembly B. The gear at the tail of the second-stage assembly B meshes with the third-stage planetary gear 306 in the third-stage assembly C. The third-stage planetary gear carrier 307 is connected to the copper sleeve 305. A type A elastic retaining ring 302 for holes is installed at the tail of the copper sleeve 305.

[0024] like Figures 5-7 The 3rd stage assembly C includes a 3rd stage planetary gear 306, a 3rd stage planetary gear carrier 307, and a double-layered hole spiral retaining ring b206. The 3rd stage planetary gear 306 is placed in the frame of the 3rd stage planetary gear carrier 307, and the double-layered hole spiral retaining ring b206 is installed on the top of the 3rd stage planetary gear carrier 307. The second-stage assembly B includes a second-stage planetary gear 308, a second-stage planetary gear carrier 310, and a single-layer hole spiral retaining ring 309. The second-stage planetary gear 308 is placed in the frame of the second-stage planetary gear carrier 310, and the single-layer hole spiral retaining ring 309 is installed on the top of the second-stage planetary gear carrier 310. The first-stage assembly A includes a first-stage planetary gear 311, a first-stage planetary gear carrier 312, and a single-layer hole spiral retainer 309. The first-stage planetary gear 311 is placed in the frame of the first-stage planetary gear carrier 312, and the single-layer hole spiral retainer 309 is installed on the top of the first-stage planetary gear carrier 312.

[0025] like Figure 8 The sleeve assembly 4 includes a reaction arm sleeve 401. The sleeve 403 is fitted into the reaction arm sleeve 401 and the reaction arm sleeve 401 is fixed with an internal hexagonal set screw 406. The sleeve copper sleeve 402 is placed on the sleeve 403. The hole is fitted with a type B elastic retaining ring 404 at the bottom of the sleeve 403. The reaction arm plate 405 is placed on the side of the sleeve 403. The sleeve 403 contains the self-locking device 5.

[0026] like Figures 9-10 The self-locking device 5 includes a housing a503. The tail of the self-locking device 5 is connected to the sleeve 403. Inside the housing a503, a slot 505 and a slider 506 are placed in sequence. The top of the slot 505 has a square buckle 502. A locking ring 504 is placed on the upper part of the slider 506. A spring a507 is placed between the slider 506 and the locking ring 504. A spring b508 is installed at the bottom of the slider 506.

[0027] like Figure 11 The top of the self-locking device 5 is connected to the lock head, and the bottom of the lock head is connected to the cotter pin 501 by the lock handle 513. The steel ball 512 is placed in the lock handle 513. The spring c511 is placed at the bottom of the movable sleeve 510. The movable sleeve 510 is installed on both sides with the steel ball 512, and the sleeve b509 is placed on the lock handle 513.

[0028] A method for using a self-locking device on a torque wrench, such as... Figures 9-11 Specifically, it includes the following steps: Step 1: First, connect the lock head to the square latch 502 on the top of the self-locking device 5 through the cotter pin 501. Press down the sleeve b509, and the movable sleeve 510 will be pressed under the steel ball 512 to unlock the lock head. After the lock head is unlocked, insert the drill bit, release the sleeve b509, and the sliding sleeve 510 will pop up, pressing the steel ball 512 into the lock handle 513 to lock the drill bit, thus completing the locking. Step 2: While pressing down on the housing b509, the square latch 502 pushes the slot 505 to slide down, and the compression locking ring 504 drives the slider 506 to retract downward until the cotter pin 501, the square latch 502 and the housing a503 are completely locked. Step 3: After completing the work, press the housing b509 to remove the drill bit. The lock head can be pulled out directly, making it easy to replace the lock head. After the lock head is pulled out, the self-locking device 5 will restore it to its initial state through springs a507 and b508.

[0029] like Figure 12 The controller 109 scans the code to determine the working position during on-site operation. After the tightening is completed, the torque generated by the operation is uploaded according to whether the site has network conditions: offline export or real-time transmission. This realizes the integration of on-site data with the 3D BIM model and enables browser-based integrated 3D model viewing and data tracking. By performing soft collision checks on the bolt parts of the project's 3D model, the inconvenience of on-site construction is eliminated. Soft collision checks are also made a necessary procedure in the design phase, optimizing the workflow of the project design phase.

[0030] When using the torque wrench described in this invention: First, confirm the network environment at the site, select the data transmission method, insert the drill bit into the self-locking device 5 of the torque wrench, install the battery 101 into the torque wrench, input the predetermined torque value through the controller 109, install the reaction arm plate 405, press the switch, and the motor assembly 1 rotates the camshaft 108 according to the set current, driving the gearbox assembly 2. The gear at the tail of the input shaft 304 in the gearbox assembly 2 meshes with the first stage assembly A in the gear cylinder assembly 3, the gear at the tail of the first stage assembly A drives the second stage assembly B, the gear at the tail of the second stage assembly B meshes with the planetary gear in the third stage assembly C, and the third stage assembly C drives the sleeve 403 in the sleeve assembly 4 to rotate, thereby completing the operation of the torque wrench. Select a suitable method to transmit the recorded data to the computer.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the descriptions in the foregoing specification are merely illustrative of the principles of the invention, and various changes and modifications can be made to the invention without departing from its spirit and scope; all such changes and modifications fall within the scope of the claimed invention.

[0032] The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A torque wrench, characterized in that: The assembly includes a motor assembly (1), a gearbox assembly (2), a gear cylinder assembly (3), and a sleeve assembly (4). The main body of the motor assembly (1) is a motor housing (102). The motor housing (102) is equipped with a controller (109) and a battery (101) at its tail. The gearbox assembly (2) is connected to the top of the motor assembly (1). The gear cylinder assembly (3) is placed at the bottom of the gearbox assembly (2). The sleeve assembly (4) is connected to the tail of the gear cylinder assembly (3).

2. The torque wrench as described in claim 1, characterized in that: The motor assembly (1) includes the motor housing (102), a motor camshaft housing (103) is mounted on the top of the motor housing (102), a gear ring (105) and a double-hole spiral retaining ring a (107) are mounted in the motor camshaft housing (103), and a bearing gasket (106) and a deep groove ball bearing a (104) are placed at the tail of the camshaft (108).

3. The torque wrench as described in claim 1, characterized in that: The gearbox assembly (2) is externally connected by connecting the gearbox cover plate (201) to the motor connection flange (203) with hexagon socket head cap screws (202) and locating pins (207), and the motor connection flange (203) is connected to the motor assembly (1) with a connecting device. The gearbox assembly (2) is internally connected to the camshaft (108) via a motor connecting shaft (210). A gear (209) is placed on top of the motor connecting shaft (210) and meshes with a gear (209) placed on a transmission gear shaft (211). A deep groove ball bearing b (204) is placed on top of the transmission gear shaft (211). A cylindrical gear b (208) is placed between the deep groove ball bearing b (204) and the gear (209). The cylindrical gear b (208) meshes with a cylindrical gear a (205). The cylindrical gear a (205) is placed on the input shaft (304). A deep groove ball bearing b (204) is placed on top of the input shaft (304).

4. The torque wrench as described in claim 1, characterized in that: The gear cylinder assembly (3) includes a gear cylinder (301), a first-stage assembly A, a second-stage assembly B, a third-stage assembly C, and a copper sleeve (305). A type A retaining ring (302) for the hole is installed on the upper part of the gear cylinder (301). The gear at the tail of the input shaft (304) meshes with the first-stage planetary gear (311) in the first-stage assembly A. The gear at the tail of the first-stage assembly A meshes with the second-stage planetary gear (308) in the second-stage assembly B. The gear at the tail of the second-stage assembly B meshes with the third-stage planetary gear (306) in the third-stage assembly C. The third-stage planetary gear carrier (307) is connected to the copper sleeve (305). The type A retaining ring (302) for the hole is placed at the tail of the copper sleeve (305).

5. The torque wrench as described in claim 4, characterized in that: The 3-stage assembly C includes a 3-stage planetary gear (306), a 3-stage planetary gear carrier (307), and a double-layered hole spiral retaining ring b (206). The 3-stage planetary gear (306) is placed in the frame of the 3-stage planetary gear carrier (307), and the double-layered hole spiral retaining ring b (206) is installed on the top of the 3-stage planetary gear carrier (307). The second-stage assembly B includes a second-stage planetary gear (308), a second-stage planetary gear carrier (310), and a single-layer hole spiral retainer (309). The second-stage planetary gear (308) is placed in the frame of the second-stage planetary gear carrier (310), and the single-layer hole spiral retainer (309) is installed on the top of the second-stage planetary gear carrier (310). The first-stage assembly A includes a first-stage planetary gear (311), a first-stage planetary gear carrier (312), and a single-layer hole spiral retainer (309). The first-stage planetary gear (311) is placed in the frame of the first-stage planetary gear carrier (312), and the single-layer hole spiral retainer (309) is installed on the top of the first-stage planetary gear carrier (312).

6. The torque wrench as described in claim 1, characterized in that: The sleeve assembly (4) includes a reaction arm sleeve (401) and a self-locking device (5). The sleeve copper sleeve (402) is placed on the sleeve (403). The sleeve (403) is inserted into the reaction arm sleeve (401). The reaction arm sleeve (401) is fixed with an internal hexagonal recessed set screw (406). The hole is placed at the bottom of the sleeve (403) with an elastic retaining ring type B (404). The reaction arm plate (405) is placed on the side of the sleeve (403). The sleeve (403) contains the self-locking device (5).

7. The torque wrench as described in claim 1, characterized in that: The controller (109) includes a human-machine interface and records the torque in the controller (109).

8. The torque wrench as described in claim 6, characterized in that: The self-locking device (5) includes a housing a (503), the tail of the self-locking device (5) is connected to the sleeve (403), a slot (505) and a slider (506) are placed inside the housing a (503) in sequence, a square buckle (502) is provided at the top of the slot (505), a locking ring (504) is placed on the upper part of the slider (506), a spring a (507) is placed between the slider (506) and the locking ring (504), and a spring b (508) is installed at the bottom of the slider (506); The top of the self-locking device (5) is connected to the lock head, and the bottom of the lock head is connected to the cotter pin (501) by the lock handle (513). The steel ball (512) is placed in the lock handle (513), and the spring c (511) is placed at the bottom of the movable sleeve (510). The movable sleeve (510) is installed on both sides of the steel ball (512), and the sleeve b (509) is placed on the lock handle (513).

9. A method for operating a torque wrench self-locking device, employing the method described in claim 8, specifically comprising the following steps: Step 1: First, connect the lock head to the square latch (502) on the top of the self-locking device (5) through the cotter pin (501), press down the sleeve b (509), the movable sleeve (510) is pressed under the steel ball (512), unlock the lock head, after the lock head is unlocked, insert the drill bit, release the sleeve b (509), the sliding sleeve (510) will pop up, press the steel ball (512) into the lock handle (513) to lock the drill bit, and complete the locking; Step 2: While pressing down on the housing b (509), the square buckle (502) pushes the slot (505) to slide down, and the compression lock ring (504) drives the slider (506) to retract downward until the cotter pin (501) is completely locked with the housing a (503); Step 3: After completing the work, press the housing b (509) to remove the drill bit. The lock head can be pulled out directly, making it easy to replace the lock head. After the lock head is pulled out, the self-locking device (5) will restore it to its initial state through spring a (507) and spring b (508).

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