Bolt wrench

Abstract

The invention relates to the technical field of manual tools, in particular to a bolt wrench which comprises a wrench body provided with a grip portion and a drill bit portion. The rotating head is rotatably arranged on the front side of the drill bit part, a containing cavity is formed in the rotating head, and a cutting hole is formed in the side wall of the containing cavity; the front-back telescopic piece is arranged in the containing cavity and is arranged in the axis direction of the rotating head; the up-and-down cutting piece is mounted on the front-and-back telescopic piece, and the up-and-down cutting piece can extend out of the cutting hole under the driving of the front-and-back telescopic piece; the sensing assembly is arranged in the drill bit part; the sensing assembly is used for detecting whether the rotating head slips or not; the upper cutting piece and the lower cutting piece quickly extend out and are embedded into the inner wall of the bolt to form an additional mechanical meshing surface; the technical problem that a traditional electric wrench cannot be screwed out continuously due to slipping when encountering a hexagon bolt which is seriously rusted or has a smooth inner wall is solved.

Description

Technical Field

[0001] The present application relates to the technical field of hand tools, and in particular to a bolt wrench. Background Art

[0002] An electric wrench is an electric tool used to tighten or loosen bolts and nuts, and is commonly used for assembly and disassembly of high-strength bolts.

[0003] However, in existing technology, when using an electric wrench to remove severely corroded hexagon socket bolts, the bolt head often slips due to corrosion, making effective removal difficult. Rust rounds the bolt head's edges and increases its surface roughness, increasing the clearance between the wrench sleeve and the bolt head, and reducing friction on the contact surface. In this situation, the sleeve is prone to slipping when rotating.

[0004] Operators often mistakenly believe they need to increase power, further increasing the speed of the electric wrench or applying more torque. However, this excessive speed leads to increased slippage, which accelerates the damage to the hexagon socket bolt head. Once the bolt head is further worn and deformed, the socket will not be able to engage, and the hexagon socket bolt head will eventually become unable to be unscrewed.

[0005] Therefore, the existing technology has defects and deficiencies and needs further improvement and development. Summary of the Invention

[0006] In view of the above-mentioned deficiencies in the prior art, the purpose of this application is to provide a bolt wrench, aiming to solve the problem that the electric wrench in the prior art is difficult to unscrew the severely rusted hexagon socket bolts.

[0007] The technical solution adopted by the present application to solve the technical problem is as follows: a bolt wrench, comprising: A wrench body, wherein the wrench body is provided with a handle portion and a drill portion; A rotating head, the rotating head being rotatably disposed on the front side of the drill head, the rotating head being provided with an accommodating cavity, and the side wall of the accommodating cavity being provided with a cutting hole; Front and rear telescopic members, the front and rear telescopic members are arranged in the accommodating cavity and along the axis of the rotating head; Upper and lower cutting members, the upper and lower cutting members being mounted on the front and rear telescopic members, and the upper and lower cutting members being able to extend from the cutting holes under the drive of the front and rear telescopic members; A sensor assembly is provided in the drill head; the sensor assembly is used to detect whether the rotary head is slipping; When the rotating head is detected to be slipping, the front and rear telescopic members are activated to drive the upper and lower cutting members to extend from the cutting hole and cut into the inner wall of the hexagon socket bolt; When the upper and lower cutting members cut into the preset depth, the rotating head restarts and drives the hexagon socket bolt to be screwed out.

[0008] Optionally, the upper and lower cutting parts include a lifting rod and a cutting knife, the cutting knife is a carbide blade, the blade edge is triangular serrated, the sawtooth inclination angle is 15°~30° and the tooth depth is 0.5~1mm; the ratio of the width of the protruding end of the cutting knife to the width of the cutting hole is 1:1.2~1.5.

[0009] Optionally, an oil brushing piece is provided at the edge of the cutting hole, and a conical pit is provided in the oil brushing piece, and the conical pit is used to store cutting oil; When the cutting piece extends, the oil brushing piece is squeezed, and the cutting oil is squeezed out to lubricate the cutting blade and reduce the cutting resistance; When the cutting blade is retracted, the conical pit uses the negative pressure effect to re-absorb the residual grease, thereby realizing self-circulating oil supply and avoiding dry friction.

[0010] Optionally, the sensing assembly is provided with a Hall sensor and a strain gauge torque sensor, wherein the Hall sensor is used to detect the real-time rotation speed of the rotary head; the strain gauge torque sensor is used to detect the output torque of the rotary head; When the strain gauge torque sensor detects a torque decrease rate greater than or equal to 50%, and the Hall sensor detects a speed increase rate greater than or equal to 100%, it is determined to be a slipping state.

[0011] Optionally, the front and rear telescopic members are provided with a reciprocating telescopic motor, a pushing motor and a front and rear telescopic rod; the pushing motor is fixedly arranged in front of the push-pull rod of the reciprocating telescopic motor; a rising rod is sleeved inside the front and rear telescopic rod, and the rising rod is slidably connected to the lifting rod; the rising rod is connected to the pushing shaft of the pushing motor; Among them, when it is determined to be in a slipping state, the driving shaft of the driving motor drives the rising rod to move forward, and the rising rod drives the lifting rod to move upward, driving the cutting knife to extend from the cutting hole and cut into the inner wall of the hexagon socket bolt. Then, the reciprocating telescopic motor starts to drive the driving motor and the front and rear telescopic rods to reciprocate back and forth, so that the cutting knife cuts the inner wall of the hexagon socket bolt.

[0012] Optionally, the sensing assembly also includes a limit sensor; the limit sensor is arranged at the propulsion end of the lifting rod, and the limit sensor is used to detect the extension displacement of the upper and lower cutting pieces; when the extension displacement reaches 4mm~7mm, the reciprocating telescopic motor and the pushing motor stop working, and the rotating head is started to rotate at a speed of 200r / min~300r / min.

[0013] Optionally, the bolt wrench also includes: a rotating motor, which is rotatably connected to the coupling of the rotating head; the strain gauge torque sensor is arranged at the coupling where the rotating head is connected to the rotating motor; and the Hall sensor is arranged next to the rotating part of the rotating head close to the coupling.

[0014] Optionally, the cutting holes are symmetrically opened on the side wall of the sleeve and directly facing the side edge line of the inner hexagon.

[0015] Optionally, the bolt wrench further comprises: a controller, the controller being arranged on the handle, and the handle being provided with a control button; The controller is electrically connected to the sensor assembly, the rotating motor, the reciprocating telescopic motor, the pushing motor, and the control button.

[0016] Another technical solution adopted by this application to solve the technical problem is as follows: A method for removing a corroded hexagon socket bolt, wherein the method comprises the bolt wrench as described above; the method comprises: When the rotating head is sleeved on the head of the hexagon socket bolt, the rotating head is started to rotate at a speed of 100 r / min to 150 r / min; When the sensing component detects that the torque decrease rate is greater than or equal to 50% within 100 ms, and the sensing component detects that the speed increase rate is greater than or equal to 100%, the rotating head stops rotating, and the front and rear telescopic members are started to advance, so that the upper and lower cutting members contact the inner side wall of the hexagon socket bolt; the front and rear telescopic members drive the upper and lower cutting members to reciprocate back and forth; When the sensor assembly detects that the extension displacement of the upper and lower cutting members reaches 4mm~7mm, the front and rear telescopic members stop working, and the sensor assembly triggers the rotary head to rotate in the opposite direction at a speed of 200r / min~300r / min; When the hexagon socket bolt is screwed out, the front and rear telescopic members drive the upper and lower cutting members to be retracted from the cutting hole.

[0017] Compared with the prior art, the present application provides a bolt wrench, which is constructed with the functions of slippage recognition and active cutting-in by setting a wrench body, a rotating head, front and rear telescopic parts, upper and lower cutting parts and a sensor component. Among them, the rotating head is responsible for conventional driving operations, and the sensor component is used to monitor the working status of the rotating head in real time. Once the system detects that there is obvious slippage between the rotating head and the hexagon socket bolt, the upper and lower cutting parts can be driven by the control system to quickly extend and embed into the inner wall of the bolt to form an additional mechanical bite surface. It realizes the transition from passive obstruction to active correction, and solves the technical problem that traditional electric wrenches cannot continue to unscrew due to slippage when encountering hexagonal bolts with severe rust or smooth inner walls. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the bolt wrench provided in this application; Figure 2 It is a schematic diagram of the three-dimensional structure of the bolt wrench 1 provided in this application; Figure 3 This application provides Figure 2 Schematic diagram of the enlarged structure at A in the middle; Figure 4 This is another schematic diagram of the three-dimensional structure of the bolt wrench provided in this application; Figure 5 This application provides Figure 4 Schematic diagram of the enlarged structure at B in the middle; Figure 6 It is a front view of the bolt wrench provided in this application; Figure 7 This application provides Figure 6 The cross-sectional view along the Ⅰ-Ⅰ direction; Figure 8 This is a schematic block diagram of the functional principle of the bolt wrench provided in this application; Figure 9 The present invention provides a flowchart of a method for removing a rusted hexagon socket bolt.

[0019] Description of reference numerals: 10. Bolt wrench; 11. Wrench body; 111. Grip; 112. Drill head; 12. Rotating head; 121. Accommodating cavity; 1211. Cutting hole; 1212. Oiling part; 1213. Conical pit; 13. Front and rear telescopic parts; 131. Reciprocating telescopic motor; 1311. Push-pull rod; 132. Push motor; 133. Front and rear telescopic rod; 1331. Rising rod; 14. Upper and lower cutting parts; 141. Lifting rod; 142. Cutting knife; 15. Sensing assembly; 151. Hall sensor; 152. Strain gauge torque sensor; 153. Limit sensor; 16. Rotating motor; 161. Coupling; 17. Control button; 18. Controller. DETAILED DESCRIPTION

[0020] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0021] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0023] Please refer to Figures 1 to 8The first embodiment of the present application provides a bolt wrench 10, which includes a wrench body 11, a rotating head 12, a front and rear telescopic member 13 and a sensor assembly 15. The wrench body 11 is provided with a handle 111 and a drill head 112, and the handle 111 is provided with a control button 17. The rotating head 12 is rotatably arranged on the front side of the drill head 112, and a accommodating cavity 121 is provided in the rotating head 12, and a cutting hole 1211 is opened on the side wall of the accommodating cavity 121. The front and rear telescopic member 13 is arranged in the accommodating cavity 121 and arranged along the axial direction of the rotating head 12. Specifically, the accommodating cavity 121 is an axial cavity inside the rotating head 12, and the front and rear telescopic member 13 is fixed to the rear end wall of the accommodating cavity 121 through a flange base; the front and rear telescopic rods 133 extend along the axial direction of the cavity, and their tails are threadedly connected to the push-pull rod 1311 of the reciprocating telescopic motor 131. The upper and lower cutting members 14 are mounted on the front and rear telescopic members 13 and include a lifting rod 141 and a cutting blade 142. The sensing assembly 15 includes a Hall effect sensor 151, a strain gauge torque sensor 152, and a limit sensor 153. An oiling member 1212 is provided at the edge of the cutting hole 1211. Within this member is a conical recess 1213 for storing cutting oil. The bolt wrench 10 also includes a rotary motor 16 rotatably connected to the rotary head 12, and a controller 18 disposed on the handle 111. The controller 18 is electrically connected to the sensing assembly 15, the rotary motor 16, the reciprocating and telescopic motor 131, and the push motor 132. The front and rear telescopic members 13 are equipped with the reciprocating and telescopic motor 131, the push motor 132, and the front and rear telescopic rods 133. The front and rear telescopic rods 133 are internally mounted with a lifting rod 1331, which is connected to the lifting rod 141. The lifting rod 1331 is also connected to the push shaft of the push motor 132. When the bolt wrench 10 is used to unscrew a rusted hexagon socket bolt, the rotating head 12 is first sleeved onto the head of the hexagon socket bolt and the rotating head 12 is started to rotate at a speed of 100 r / min to 150 r / min. The sensor assembly 15 detects the status of the rotating head 12: the strain gauge torque sensor 152 detects the output torque, and the Hall sensor 151 detects the real-time speed. When the strain gauge torque sensor 152 detects that the torque drop rate is greater than or equal to 50%, and the Hall sensor 151 detects that the speed increase rate is greater than or equal to 100%, the controller 18 determines that it is in a slipping state. At this time, the rotating head 12 stops rotating, and the rotating motor 16 stops rotating. The controller 18 starts the front and rear telescopic parts 13. The driving shaft of the driving motor 132 pushes the rising rod 1331 to move forward, and the rising rod 1331 pushes the lifting rod 141 to move upward, driving the cutting knife 142 to extend from the cutting hole 1211 and cut into the inner wall of the hexagon socket bolt.When the cutting blade 142 extends, it squeezes the oil brush 1212, squeezing out the cutting oil in the conical recess 1213 and lubricating the cutting blade 142 to reduce cutting resistance. When the cutting blade 142 retracts, the conical recess 1213 uses a negative pressure effect to reabsorb any remaining grease. Specifically, the oil brush 1212 has a conical cavity. When the cutting blade 142 extends and squeezes, the cavity shrinks, squeezing out the cutting oil. When it retracts, the cavity expands, creating a Bernoulli negative pressure effect that draws any remaining oil into the recess through the capillary oil passage. During rotation, the grease in the oil brush is not easily brushed out due to the low speed of the rotating motor. The limit sensor 153 detects the extension displacement of the upper and lower cutting members 14. When the extension displacement reaches 4 mm to 7 mm, the push motor 132 stops, and the reciprocating telescopic motor 131 begins to drive the push motor 132 and the front and rear telescopic rods 133 in a reciprocating motion, causing the cutting blade 142 to cut the inner wall of the hexagon socket bolt. After the cutting is completed, the controller 18 triggers the rotary head 12 to rotate in the opposite direction at a speed of 200-300 r / min, driving the hexagon socket bolt to be screwed out. After the hexagon socket bolt is screwed out, the front and rear telescopic members 13 drive the upper and lower cutting members 14 to retract from the cutting hole 1211.

[0024] In some embodiments, the bolt wrench 10 includes a wrench body 11, a rotating head 12, a front and rear telescopic member 13, an upper and lower cutting member 14 and a sensor assembly 15; the wrench body 11 is provided with a grip portion 111 and a drill head 112; the rotating head 12 is rotatably arranged at the front side of the drill head 112, and a accommodating cavity 121 is provided in the rotating head 12, and a cutting hole 1211 is opened on the side wall of the accommodating cavity 121; the front and rear telescopic members 13 are arranged in the accommodating cavity 121 and are arranged along the axial direction of the rotating head 12; the upper and lower cutting members 14 are installed on the front and rear telescopic members 13, the upper and lower cutting members 14 can be extended from the cutting hole 1211 under the drive of the front and rear telescopic members 13; the sensor component 15 is arranged in the drill head 112; the sensor component 15 is used to detect whether the rotating head 12 is slipping; wherein, when the rotating head 12 is detected to be slipping, the front and rear telescopic members 13 are started to drive the upper and lower cutting members 14 to extend from the cutting hole 1211 and cut into the inner wall of the hexagon socket bolt; when the upper and lower cutting members 14 cut into the preset depth, the rotating head 12 is restarted and drives the hexagon socket bolt to be screwed out. Furthermore, by setting a rotating head 12 on the front side of the drill head 112 of the wrench body 11, and setting a accommodating cavity 121 and a cutting hole 1211 in the rotating head 12, and coordinating the front and rear telescopic parts 13 and the upper and lower cutting parts 14, when the sensor component 15 detects a slipping state between the rotating head 12 and the hexagon socket bolt, such as an abnormal increase in speed or an abnormal decrease in torque, the front and rear telescopic parts 13 can be immediately started to drive the upper and lower cutting parts 14 to pass through the cutting hole 1211 and cut into the inner wall of the bolt, thereby achieving the purpose of enhancing the bite force and breaking the rust. It is particularly suitable for dealing with the technical problem that the edge of the hexagon socket bolt head is smooth and cannot be unscrewed due to slippage due to severe rust. By cutting to form a new contact surface, the torque transmission efficiency between the rotating head 12 and the bolt is improved, thereby ensuring that the wrench can smoothly unscrew the rusted bolt, improving the disassembly efficiency and success rate, and reducing the reliance on manual intervention such as external force or grinding.

[0025] Please refer to Figures 1 to 3In some embodiments, the bolt wrench 10 includes a wrench body 11, a rotating head 12, a front and rear telescopic member 13, an upper and lower cutting member 14 and a sensor assembly 15; the wrench body 11 is provided with a grip portion 111 and a drill head 112; the rotating head 12 is rotatably arranged at the front side of the drill head 112, a receiving cavity 121 is provided in the rotating head 12, and a cutting hole 1211 is opened on the side wall of the receiving cavity 121; the front and rear telescopic member 13 is provided in the receiving cavity 121 and is arranged along the axis direction of the rotating head 12; the upper and lower cutting members 14 are installed on the front and rear telescopic member 13. On the part 13, the upper and lower cutting parts 14 can be extended from the cutting hole 1211 under the drive of the front and rear telescopic parts 13; the sensor component 15 is arranged in the drill head 112; the sensor component 15 is used to detect whether the rotating head 12 is slipping; wherein, when the rotating head 12 is detected to be slipping, the front and rear telescopic parts 13 are started, driving the upper and lower cutting parts 14 to extend from the cutting hole 1211 and cut into the inner wall of the hexagon socket bolt; when the upper and lower cutting parts 14 cut into the preset depth, the rotating head 12 is restarted and drives the hexagon socket bolt to be unscrewed. Then, by setting the wrench body 11, the rotating head 12, the front and rear telescopic parts 13, the upper and lower cutting parts 14 and the sensor component 15, an intelligent bolt wrench 10 system with slippage recognition and active cutting functions is constructed. Among them, the rotating head 12 is responsible for conventional driving operations, and the sensor component 15 is used to monitor the working status of the rotating head 12 in real time. Once the system detects significant slippage between the rotating head 12 and the hexagon socket bolt, the control system drives the upper and lower cutting members 14 to rapidly extend and engage the inner wall of the bolt, creating an additional mechanical engagement surface. This shift from passive obstruction to active correction solves the technical problem of traditional electric wrenches being unable to remove hexagonal bolts due to slippage when encountering severely corroded or smooth inner walls. This improves disassembly success rates and construction efficiency, making it particularly suitable for high-reliability scenarios such as outdoor equipment maintenance, bridge structure maintenance, and heavy machinery disassembly and assembly.

[0026] Please refer to Figures 4 and 5In some embodiments, the upper and lower cutting members 14 include a lifting rod 141 and a cutting blade 142. The cutting blade 142 is a carbide blade with a triangular serrated edge, a serration angle of 15° to 30°, and a tooth depth of 0.5 to 1 mm. The ratio of the width of the extended end of the cutting blade 142 to the width of the cutting hole 1211 is 1:1.2 to 1.5. Furthermore, by specifically configuring the upper and lower cutting members 14 as a structure comprising the lifting rod 141 and the cutting blade 142, and using a carbide blade with a triangular serrated edge design, a tooth depth of 0.5 mm to 1 mm, and a tooth angle of 15° to 30°, the blade's ability to penetrate rusted or deformed metal surfaces is effectively improved, making the cutting process faster and with less resistance. Furthermore, the width of the extended end of the cutting blade 142 is set at a ratio of 1:1.2 to 1.5 of the width of the cutting hole 1211. This ensures sufficient guiding stability during extension and retraction, preventing jamming or deflection and thus structural damage. This design enhances targeted cutting and structural coordination, demonstrating excellent wear resistance and cutting efficiency in actual operation, ensuring effective bolt engagement even under complex working conditions.

[0027] Please refer to Figures 4 and 5 In some embodiments, an oil brush 1212 is provided at the edge of the cutting hole 1211. A conical recess 1213 is provided within the oil brush 1212 to store cutting oil. When the cutting element extends, the oil brush 1212 is squeezed, squeezing the cutting oil out and lubricating the cutting blade 142, reducing cutting resistance. When the cutting blade 142 retracts, the conical recess 1213 utilizes a negative pressure effect to reabsorb residual grease, achieving self-circulating oil supply and preventing dry friction. Furthermore, by providing the oil brush 1212 at the edge of the cutting hole 1211 and constructing a conical recess 1213 therein for storing cutting oil, the lubricant can be squeezed by the tool itself as the cutting blade 142 extends, forming an oil film covering the cutting surface, thereby reducing the friction coefficient and local temperature rise during cutting. Furthermore, when the cutting blade 142 retracts, a local negative pressure is formed within the conical recess 1213, automatically sucking back residual cutting oil and achieving lubricant recycling. This design not only avoids lubricant waste and environmental pollution, but also reduces the wear rate of the cutting blade 142, thereby improving the system's operational stability and service life. It is suitable for long-term operation scenarios and can reduce maintenance frequency and downtime.

[0028] Please refer to Figures 6 and 7In some embodiments, the sensing assembly 15 is provided with a Hall sensor 151 and a strain gauge torque sensor 152. The Hall sensor 151 is used to detect the real-time rotational speed of the rotary head 12; the strain gauge torque sensor 152 is used to detect the output torque of the rotary head 12; the strain gauge torque sensor 152 is disposed at the coupling where the rotary head 12 is connected to the rotary motor. Specifically, the strain gauge torque sensor 152 is directly embedded in the coupling 161 and detects the torque transmitted from the rotary motor 16 to the rotary head 12 in real time. It is directly in the power transmission path and can most accurately reflect the actual torque output by the rotary head 12 to the bolt. The Hall sensor 151 is disposed near the rotating portion of the rotary head 12 near the coupling 161. A small permanent magnet is mounted on the rotary head 12, and the Hall sensor 151 is fixed to a nearby housing to detect changes in the magnetic field. When the strain gauge torque sensor 152 detects a torque decrease rate of ≥50% for 100 consecutive milliseconds and the Hall sensor 151 simultaneously detects a speed increase rate of ≥100%, a slip state is determined. Furthermore, by providing a Hall sensor 151 and a strain gauge torque sensor 152, the speed change of the rotary head 12 and the change in applied torque can be obtained respectively. When the values are abnormal, such as the torque drop rate ≥ 50% and the speed increase rate ≥ 100%, it is quickly determined to be an "idling" state and a slip signal is issued. The sensor component 15 is linked to the cutting mechanism electronic control unit and can trigger the cutting process within a millisecond response, preventing the rotary head 12 from idling for a long time, causing overheating of parts, damage to the tool, or operation failure. Compared with the traditional method that relies solely on the operator's experience and judgment, the automatic recognition system has higher accuracy and reliability, ensuring that the entire machine has stronger adaptability in complex environments.

[0029] Please refer to Figures 6 and 7In some embodiments, the front and rear telescopic members 13 are provided with a reciprocating telescopic motor 131, a pushing motor 132 and a front and rear telescopic rod 133; the pushing motor 132 is fixedly arranged in front of the push-pull rod 1311 of the reciprocating telescopic motor 131; a rising rod 1331 is sleeved in the front and rear telescopic rod 133, and the rising rod 1331 is connected to the lifting rod 141; the rising rod 1331 is connected to the pushing shaft of the pushing motor 132; specifically, the rising rod 1331 and the lifting rod 141 are connected by an inclined wedge transmission. The mechanism is connected to the lifting rod 1331. The front end of the lifting rod 1331 is provided with an inclined wedge portion, and the bottom end of the lifting rod 141 is provided with an inclined wedge slider structure that fits the inclined wedge portion. Specifically, the inclined wedge portion at the front end of the lifting rod 1331 adopts a 45° inclination design and is nitrided and hardened. The inclined wedge slider at the bottom of the lifting rod 141 is embedded with a self-lubricating copper-based bushing to reduce friction loss. When the push motor 132 drives the lifting rod 1331 horizontally, the inclined wedge portion pushes the lifting rod 141 to slide upward along the inclined surface, thereby vertically extending the cutting blade 142. This achieves the conversion of horizontal thrust into vertical displacement. When the state of slippage is determined, the driving shaft of the driving motor 132 drives the rising rod 1331 forward, and the rising rod 1331 drives the lifting rod 141 upward, driving the cutting blade 142 to extend from the cutting hole 1211 and cut into the inner wall of the hexagon socket bolt. Then, the reciprocating telescopic motor 131 starts to drive the driving motor 132 and the front and rear telescopic rods 133 to reciprocate back and forth, so that the cutting blade 142 cuts the inner wall of the hexagon socket bolt. Furthermore, by constructing the front and rear telescopic member 13 as a combination of the reciprocating telescopic motor 131, the driving motor 132, and the front and rear telescopic rods 133, and by using a driving mechanism to cause the lifting rod 141 to drive the cutting blade 142 to extend and reciprocate, the cutting blade 142 no longer advances in a single motion during the bolt insertion process, but can slowly cut into the inner wall in a reciprocating manner under a relatively small torque, thereby improving the integrity and safety of the occlusal surface processing. This method effectively avoids tool breakage when the steel is too strong or the rust layer is thick, and is particularly suitable for a wide range of applications in field operations involving bolts of different materials and different rust levels. Combined with the signal from the sensor assembly 15, the penetration depth and frequency can be adjusted as needed, enhancing the system's adaptability.

[0030] Please refer to Figures 6 and 7In some embodiments, the sensing assembly 15 further includes a limit sensor 153; the limit sensor 153 is arranged at the propulsion end of the lifting rod 141. Specifically, the limit sensor 153 is a laser displacement sensor, which is vertically aligned with the outer side of the lifting rod 141 and the scale groove on the wall; when it is detected that the extension displacement of the lifting rod 141 relative to the initial position reaches a preset safety threshold, a stop signal is triggered; the limit sensor 153 is used to detect the extension displacement of the upper and lower cutting members 14; when the extension displacement reaches 4mm~7mm, the reciprocating telescopic motor 131 and the pushing motor 132 stop working, and the rotating head 12 is started to rotate at a speed of 200r / min~300r / min. Furthermore, by providing a limit sensor 153 at the propulsion end of the propulsion motor 132, the extension depth of the upper and lower cutting members 14 can be accurately monitored. When the tool extension depth reaches a preset value, such as 4mm to 7mm, specifically, the cutting depth is set to 4-7mm (covering more than 1.5 times the groove depth), ensuring that the blade forms an effective anti-torsion surface after being embedded. The cutting depth can be adjusted according to different bolts to meet the requirement of covering more than 1.5 times the groove depth; then a stop signal is immediately sent to automatically stop the propulsion motor 132 and the reciprocating motor and restart the rotating head 12. This effectively avoids structural damage to the cutting blade 142 due to overtravel or interference with the bottom of the bolt. At the same time, this depth setting value takes into account both bite strength and structural safety, ensuring sufficient cutting penetration to form mechanical bite force and effectively control cutting accuracy.

[0031] In some embodiments, the rotating head 12 is provided with a phase adjustment chamber. Specifically, a sealed chamber structure is formed around the reciprocating and telescopic motor 131 and the push-pull rod 1311. This chamber is filled with magnetorheological fluid. A circular cover is located outside the rotating head 12, and a ring-shaped electromagnetic coil is embedded in the inner wall of the cover. The controller 18 adjusts the current to change the magnetic field strength, allowing the viscosity of the magnetorheological fluid to be continuously adjustable within a certain range. The rheological properties of the magnetorheological fluid can reversibly change with the strength of the applied magnetic field. Specifically, when there is no magnetic field, the magnetorheological fluid behaves as a low-viscosity Newtonian fluid with good fluidity. When a magnetic field is applied, the magnetic particles in the magnetorheological fluid rapidly align along the magnetic field lines to form chain-like or columnar structures, resulting in a significant increase in the fluid's viscosity, imbuing it with mechanical properties similar to those of a plastic solid, and significantly increasing the shear stress and viscosity of the fluid. The previously smooth fluid instantly becomes viscous, acting as if to "brake" the rotation of the rotating head 12, significantly increasing the rotational damping and slowing its rotation. The electromagnetic coil, located outside the phase adjustment chamber, precisely adjusts the magnetic field strength by controlling the input current, thereby achieving continuous and reversible control of the magnetorheological fluid's viscosity. Furthermore, the rotational damping of the rotating head 12 is dynamically adjusted in real time based on actual needs. When electrically connected to the sensor assembly 15, this damping control is achieved, effectively synergizing to remove rusted hexagon socket head bolts.

[0032] Please refer to Figures 6 and 7 In some embodiments, the bolt wrench 10 further includes: a rotary motor 16, which is rotatably connected to the coupling 161 of the rotary head 12. Furthermore, by directly connecting the rotary motor 16 to the coupling 161 of the rotary head 12, the movement of the rotary head 12 is controlled by an independent drive source, which not only reduces the structural transmission chain and improves the response speed, but also makes the speed and torque output of the rotary head 12 more stable and controllable. Under multi-stage working conditions, the speed can be accurately set according to the feedback data, such as the initial speed of 100r / min~150r / min and the rotation speed of 200r / min~300r / min, corresponding to the disassembly requirements at different stages, thereby improving the controllability and stability of the entire disassembly process.

[0033] Please refer to Figures 4 and 5 In some embodiments, the cutting holes 1211 are symmetrically arranged on the side wall of the sleeve and directly opposite the side edge of the hexagon socket. Furthermore, the cutting holes 1211 are symmetrically arranged on the side wall of the sleeve of the rotating head 12, and are oriented directly opposite the two edges of the hexagon socket bolt, so that the cutting blade 142 can fully contact the edges of the inner wall of the bolt after being extended, thereby forming a wedge-type structural contact, which enhances the mechanical locking effect produced by the cutting blade after being subjected to force. This optimized arrangement not only improves the bite efficiency, but also ensures that the force direction of the cutting blade 142 is consistent with the rotation direction, reducing the damage to the blade caused by lateral force and enhancing the rotational stability. The design structure is reasonable, and the geometric force lines are clear, which contributes to long-term stable operation.

[0034] Please refer to Figures 6 to 8 In some embodiments, the bolt wrench 10 further includes a controller 18, which is mounted on the handle 111 and equipped with a control button 17. The controller 18 is electrically connected to the sensor assembly 15, the rotary motor 16, the reciprocating and telescopic motor 131, the push motor 132, and the control button 17. By placing the controller 18 on the handle and electrically connecting it to all sensors and actuators, a centralized closed-loop control system is formed. The presence of the controller 18 significantly reduces the operator's technical requirements and improves operational convenience.

[0035] Please refer to Figure 9 , a second embodiment of the present application provides a method for removing a corroded hexagon socket bolt, wherein the corroded hexagon socket bolt removal method includes the bolt wrench as described above; S100: When the rotating head is sleeved on the head of the hexagon socket bolt, the rotating head is started to rotate at a speed of 100 r / min to 150 r / min.

[0036] Specifically, the operator puts the rotating head on the head of the hexagon socket bolt. The rotating head can be rotatably set on the front side of the drill head of the wrench body. After turning on the control button and starting the rotating head, the rotating motor drives the rotating head to rotate at a speed of 100r / min to 150r / min, trying to unscrew the hexagon socket bolt. This speed range is set by the controller to avoid excessive slippage caused by rust in the initial stage. The accommodating cavity and cutting hole in the rotating head are aligned with the head of the hexagon socket bolt, and the Hall sensor and strain gauge torque sensor in the sensing assembly begin to monitor the status of the rotating head in real time: the Hall sensor detects the real-time speed of the rotating head, and the strain gauge torque sensor detects the output torque, providing reference data for the controller.

[0037] S200: When the sensing component detects that the torque decrease rate is greater than or equal to 50% within 100 ms, and the sensing component detects that the speed increase rate is greater than or equal to 100%, the rotating head stops rotating and starts to advance the front and rear telescopic parts, so that the upper and lower cutting parts contact the inner wall of the hexagon socket bolt.

[0038] Specifically, the sensor assembly continuously monitors the operating parameters of the rotary head. When the strain gauge torque sensor detects that the output torque decrease rate is greater than or equal to 50% for 100ms continuously, indicating that the tightening force is weakened at this time, and the Hall sensor detects that the real-time speed increase rate is greater than or equal to 100%, indicating that the rotary head is idling and accelerating at this time, the controller determines that it is in a slipping state. At this time, the controller immediately stops the rotation of the rotary head. Subsequently, the controller starts the front and rear telescopic parts: the driving shaft of the push motor pushes the rising rod forward, and the rising rod is connected to the lifting rod, thereby pushing the lifting rod upward, driving the cutting knives of the upper and lower cutting parts to extend from the cutting hole of the rotary head. During the extension process of the cutting knife, it contacts the inner wall of the hexagon socket bolt; at the same time, the cutting knife squeezes the oil brush part, so that the cutting oil stored in the conical pit in the oil brush part is squeezed out, lubricating the cutting knife and reducing the cutting resistance. The limit sensor monitors the extension displacement of the cutting knife to ensure accurate initial contact.

[0039] S300: The front and rear telescopic parts drive the upper and lower cutting parts to reciprocate back and forth. When the sensor component detects that the extension displacement of the upper and lower cutting parts reaches 4mm~7mm, the front and rear telescopic parts stop working, and the sensor component triggers the rotating head to rotate in the opposite direction at a speed of 200r / min~300r / min.

[0040] Specifically, after the cutting knife contacts the inner wall of the hexagon socket bolt, the reciprocating telescopic motors of the front and rear telescopic parts start working, driving the push motor and the front and rear telescopic rods to reciprocate back and forth. This enables the lifting rod and the cutting knife to perform a cutting action on the inner wall of the hexagon socket bolt, forming a groove to enhance the bite. During the cutting process, the limit sensor detects the extension displacement of the cutting knife in real time; when the extension displacement reaches 4mm to 7mm, that is, the preset depth of the cutting knife is met, the controller stops the operation of the reciprocating telescopic motor and the push motor. The signal from the limit sensor triggers the rotary head to restart, and the rotary motor drives the rotary head to rotate in the opposite direction at a speed of 200r / min to 300r / min. This speed range is controlled by the controller to ensure that the hexagon socket bolt is effectively driven out during reverse rotation, while avoiding secondary slippage caused by the presence of the cutting knife.

[0041] S400: When the hexagon socket bolt is screwed out, the front and rear telescopic members drive the upper and lower cutting members to retract from the cutting hole.

[0042] Specifically, after the rotating head rotates in the opposite direction and successfully removes the hexagon socket bolt, the operator releases the control button, and the controller detects the bolt removal signal. The front and rear telescopic parts start the retraction action: the push motor's driving shaft operates in the opposite direction, pulling the rising rod backward, and the rising rod drives the lifting rod downward, thereby retracting the cutting blade from the cutting hole into the accommodating cavity. During the retraction process, the conical pit of the oil brush uses the negative pressure effect to re-absorb the residual grease, realizing self-circulating oil supply and preparing for subsequent operations. Finally, the bolt wrench returns to its original state, and the cutting blade is fully retracted to avoid damage to the tool.

[0043] In some embodiments, the method for removing rusted hexagon socket bolts forms an inseparable and mutually coordinated removal path from initial contact of the bolt, identification of slippage, cutting knife entry, rotational recovery, and unscrewing of the bolt. Each step is linked to the sensor data and the actuator to ensure that each node in the system operation process can be monitored and controlled. The method for removing rusted hexagon socket bolts is particularly suitable for scenarios where there are a large number of rusted and old hexagon socket bolts to be removed in existing industries, electric power, steel structures, chemical assembly, etc., and can realize efficient and reliable intelligent operations, thereby improving the success rate, safety, and economy of hexagon socket bolt removal operations.

[0044] In summary, the present application provides a bolt wrench, which includes: a wrench body, which is provided with a grip portion and a drill head; a rotating head, which is rotatably arranged at the front side of the drill head, a accommodating chamber provided in the rotating head, and a cutting hole provided on the side wall of the accommodating chamber; a front and rear telescopic member, which is arranged in the accommodating chamber and along the axial direction of the rotating head; an upper and lower cutting member, which is installed on the front and rear telescopic member, and the upper and lower cutting members can be extended from the cutting hole under the drive of the front and rear telescopic member; a sensor component, which is arranged in the drill head; the sensor component is a sensor component for detecting whether the rotating head is slipping; wherein, when slippage of the rotating head is detected, the front and rear telescopic member is started, driving the upper and lower cutting members to extend from the cutting hole and cut into the inner wall of the hexagon socket bolt; when the upper and lower cutting members cut to a preset depth, the rotating head is restarted and drives the hexagon socket bolt to be unscrewed. Furthermore, by setting up a wrench body, a rotating head, front and rear telescopic parts, upper and lower cutting parts and a sensor component, an intelligent bolt wrench system with slippage recognition and active cutting functions was constructed. Among them, the rotating head is responsible for routine driving operations, while the sensor component is used to monitor the working status of the rotating head in real time. Once the system detects obvious slippage between the rotating head and the hexagon socket bolt, it can drive the upper and lower cutting parts to quickly extend and embed into the inner wall of the bolt through the control system to form an additional mechanical bite surface. This realizes the transition from passive obstruction to active correction, and solves the technical problem that traditional electric wrenches cannot continue to unscrew due to slippage when encountering hexagonal bolts with severe rust or smooth inner walls.

[0045] It should be understood that the application of this application is not limited to the above examples. For ordinary technicians in this field, they can make improvements or changes based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to this application.

Claims

1. A bolt wrench for unscrewing hexagon socket bolts, characterized in that: The bolt wrench comprises: A wrench body, the wrench body being provided with a grip portion and a drill portion; A rotating head, the rotating head being rotatably disposed on the front side of the drill head, the rotating head being provided with an accommodating cavity, and the side wall of the accommodating cavity being provided with a cutting hole; Front and rear telescopic members, the front and rear telescopic members are arranged in the accommodating cavity and along the axis of the rotating head; Upper and lower cutting members, the upper and lower cutting members are mounted on the front and rear telescopic members, and the upper and lower cutting members can be extended from the cutting holes under the drive of the front and rear telescopic members; A sensor assembly is provided in the drill head; the sensor assembly is used to detect whether the rotary head is slipping; When the rotating head is detected to be slipping, the front and rear telescopic members are activated to drive the upper and lower cutting members to extend from the cutting hole and cut into the inner wall of the hexagon socket bolt; When the upper and lower cutting members cut into the preset depth, the rotating head restarts and drives the hexagon socket bolt to be screwed out.

2. The bolt wrench according to claim 1, characterized in that: The upper and lower cutting parts include a lifting rod and a cutting knife. The cutting knife is a carbide blade with a triangular serrated edge, a serrated angle of 15°~30° and a tooth depth of 0.5~1mm; the ratio of the width of the protruding end of the cutting knife to the width of the cutting hole is 1:1.2~1.

5.

3. The bolt wrench according to claim 2, characterized in that: An oil brushing piece is provided at the edge of the cutting hole, and a conical pit is provided in the oil brushing piece, and the conical pit is used to store cutting oil; When the cutting piece extends, the oil brushing piece is squeezed, and the cutting oil is squeezed out to lubricate the cutting blade and reduce the cutting resistance; When the cutting blade is retracted, the conical pit uses the negative pressure effect to re-absorb the residual grease, thereby realizing self-circulating oil supply and avoiding dry friction.

4. The bolt wrench according to claim 3, characterized in that: The sensing assembly is provided with a Hall sensor and a strain gauge torque sensor, wherein the Hall sensor is used to detect the real-time rotation speed of the rotary head; the strain gauge torque sensor is used to detect the output torque of the rotary head; When the strain gauge torque sensor detects a torque decrease rate greater than or equal to 50%, and the Hall sensor detects a speed increase rate greater than or equal to 100%, it is determined to be a slipping state.

5. The bolt wrench according to claim 4, characterized in that: The front and rear telescopic members are provided with a reciprocating telescopic motor, a pushing motor and a front and rear telescopic rod; the pushing motor is fixedly arranged in front of the push-pull rod of the reciprocating telescopic motor; a rising rod is sleeved inside the front and rear telescopic rod, and the rising rod is slidably connected to the lifting rod; the rising rod is connected to the pushing shaft of the pushing motor; Among them, when it is determined to be in a slipping state, the driving shaft of the driving motor drives the rising rod to move forward, and the rising rod drives the lifting rod to move upward, driving the cutting knife to extend from the cutting hole and cut into the inner wall of the hexagon socket bolt. Then, the reciprocating telescopic motor starts to drive the driving motor and the front and rear telescopic rods to reciprocate back and forth, so that the cutting knife cuts the inner wall of the hexagon socket bolt.

6. The bolt wrench according to claim 5, characterized in that: The sensing assembly also includes a limit sensor; the limit sensor is arranged at the propulsion end of the lifting rod, and the limit sensor is used to detect the extension displacement of the upper and lower cutting pieces; when the extension displacement reaches 4mm~7mm, the reciprocating telescopic motor and the pushing motor stop working, and the rotating head is started to rotate at a speed of 200r / min~300r / min.

7. The bolt wrench according to claim 6, characterized in that: The bolt wrench also includes: a rotating motor, which is rotatably connected to the coupling of the rotating head; the strain gauge torque sensor is arranged at the coupling where the rotating head is connected to the rotating motor; and the Hall sensor is arranged next to the rotating part of the rotating head close to the coupling.

8. The bolt wrench according to claim 1, characterized in that: The cutting holes are symmetrically arranged on the side wall of the sleeve and directly facing the side edge line of the inner hexagon.

9. The bolt wrench according to claim 7, characterized in that: The bolt wrench further comprises: a controller, the controller being arranged on the handle portion, and the handle portion being provided with a control button; The controller is electrically connected to the sensor assembly, the rotating motor, the reciprocating telescopic motor, the pushing motor, and the control button.

10. A method for removing a corroded hexagon socket bolt, characterized in that: The method for removing a rusted hexagon socket bolt comprises the bolt wrench according to any one of claims 1 to 9; the method for removing a rusted hexagon socket bolt comprises: When the rotating head is sleeved on the head of the hexagon socket bolt, the rotating head is started to rotate at a speed of 100 r / min to 150 r / min; When the sensing component detects that the torque decrease rate is greater than or equal to 50% within 100 ms, and the sensing component detects that the speed increase rate is greater than or equal to 100%, the rotating head stops rotating, and the front and rear telescopic members are started to advance, so that the upper and lower cutting members contact the inner side wall of the hexagon socket bolt; the front and rear telescopic members drive the upper and lower cutting members to reciprocate back and forth; When the sensor assembly detects that the extension displacement of the upper and lower cutting members reaches 4mm~7mm, the front and rear telescopic members stop working, and the sensor assembly triggers the rotary head to rotate in the opposite direction at a speed of 200r / min~300r / min; When the hexagon socket bolt is screwed out, the front and rear telescopic members drive the upper and lower cutting members to be retracted from the cutting hole.

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