A large-torque variable-diameter tire nut assembly device

Abstract

The present invention discloses a large-torque variable-diameter tire nut assembly device, which includes a main body and a housing arranged outside the main body. An electric gun mechanism, a main body frame, a circumferential adjustment mechanism, an angle adjustment mechanism, a front obstacle detection mechanism, an operation handle, and a rear obstacle detection mechanism are successively provided on the main body from left to right. The beneficial effects of the present invention are as follows: 1. The present invention can achieve automatic tightening of nuts with large torque (≤800 N·M). 2. The present invention can realize manual continuous adjustment of the center circumference of 8 electric guns with 800 N·M between 204 mm and 230 mm by using the circumferential adjustment mechanism, which is convenient, efficient, and highly practical. 3. The present invention can realize manual continuous adjustment of the tightening device between 0° and 50° in the circumferential direction by using the angle adjustment mechanism, which is convenient for aligning the target, and the operation is simple and reliable. 4. The present invention greatly saves labor costs and at the same time greatly improves the tightening quality of large-torque nuts.

Description

Technical Field

[0001] The present invention relates to the field of auxiliary equipment for tire assembly, and particularly to a large-torque variable-diameter tire nut assembly device. Background Art

[0002] In the current automated tire assembly industry, multi-axis tightening devices with small torque are everywhere, but large-torque nut tightening devices are rare. Moreover, to automate the large-torque multi-axis synchronous tightening operation, the auxiliary structure will be too complex and the equipment will be relatively large. Therefore, most large-torque nuts are tightened entirely by the operator holding a torque wrench, and only one nut can be tightened at a time and the torque cannot be accurately measured. This method not only consumes manpower but also poses safety hazards, and the assembly efficiency is extremely low.

[0003] Furthermore, since the position of the tire is uncertain each time the vehicle to be assembled arrives at the assembly position, it is necessary to adjust the position of the tire to facilitate the tightening of the nut, which increases the process and affects the assembly efficiency. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above technical defects and provide a large-torque variable-diameter tire nut assembly device that can achieve multi-axis automatic tightening of large-torque nuts and facilitate angle adjustment.

[0005] The technical solution adopted by the present invention to achieve its technical purpose is: a large-torque variable-diameter tire nut assembly device, including a main body and a housing arranged outside the main body. An electric gun mechanism, a main body frame, a circumferential adjustment mechanism, an angle adjustment mechanism, a front obstacle detection mechanism, an operation handle, and a rear obstacle detection mechanism are sequentially arranged on the main body from left to right.

[0006] The electric gun mechanism is sleeved inside the main body frame and penetrates through the main body frame. One end of the circumferential adjustment mechanism is connected to the electric gun mechanism, and the other end is fixed to the main body frame. The angle adjustment mechanism is arranged on the outer frame of the main body frame. The front obstacle detection mechanism is arranged at the rear of the main body frame, and the opening direction is the same as that of the electric gun mechanism. The rear obstacle detection mechanism is arranged at the tail of the main body frame, and the opening direction is opposite to that of the electric gun mechanism. One end of the operation handle is connected to the main body frame, and the other end passes through the housing and extends to the outside of the housing.

[0007] Preferably, the electric gun mechanism includes a sleeve, an elastic head assembly, an electric gun, an electric gun fixing plate, and a servo motor. The elastic head assembly is arranged on one side of the electric gun. The sleeve is sleeved on the elastic head assembly. The electric gun fixing plate is arranged between the elastic head assembly and the electric gun. The servo motor is arranged on the other side of the electric gun. The electric gun and the elastic head assembly are connected to the electric gun fixing plate, and the electric gun fixing plate is fixed to the main body frame.

[0008] Preferably, the main body frame includes a wheel disc, a handle, a support shaft, an adjustment ring, a middle turntable, a laser aligner, and a rear fixing plate. The middle turntable passes through the support shaft and is disposed on one side of the support shaft. A wheel disc is provided at one end of the support shaft close to the middle turntable, and a rear fixing plate is provided at the other end. A handle is further provided on the wheel disc. A laser aligner is provided at the center of the rear fixing plate. An adjustment ring is also provided at the contact portion between the middle turntable and the support shaft.

[0009] Preferably, the circumferential adjustment mechanism includes a cover plate, an adjustment screw, a nylon pad, an adjustment shaft, a tightening screw, a pressing cover plate, and a fixing plate for the electric gun.

[0010] A sleeve is provided at one end of the fixing plate for the electric gun, and a central groove is formed at the other end. The adjustment screw is disposed in the central groove. The adjustment shaft is sleeved with the adjustment screw, and the adjustment screw can rotate along the adjustment shaft. The nylon pad is sleeved on the adjustment screw and the periphery of the adjustment shaft. The pressing cover plate is buckled on the fixing plate for the electric gun. A sliding groove is formed at the center of the pressing cover plate, and the sliding groove covers the central groove. The adjustment shaft can move along the sliding groove. The cover plate is disposed at the end of the central groove of the fixing plate for the electric gun, covering both the pressing cover plate and the fixing plate for the electric gun at the same time. A through hole is further provided on the cover plate, and the center line of the through hole coincides with the center line of the central groove and the axis line of the adjustment screw. The tightening screw is disposed on the pressing cover plate and passes through the pressing cover plate and extends into the central groove of the fixing plate for the electric gun. The cover plate and the tightening screw hold the adjustment screw, and the adjustment shaft moves horizontally along the sliding groove.

[0011] Preferably, the angle adjustment mechanism includes a suspension ring fixing member, a suspension mechanism, a ball mechanism, a sliding seat plate, a sliding seat cover plate, and a support mechanism.

[0012] There are two groups of the suspension ring fixing members, which are respectively fixed on the front and rear sides of the angle adjustment mechanism. A safety chain is connected to the upper side of the suspension ring fixing member to prevent the whole set of mechanisms from falling during operation. The suspension mechanism includes a pin, a nut, and a connecting plate. The pin passes through the sliding seat plate and the sliding seat cover plate, and nuts are disposed at both ends of the pin. The connecting plate extends upward for connecting an external automation device. The ball mechanism includes a ball cover plate and universal balls, and the ball mechanism is installed on the sliding seat plate and the sliding seat cover plate.

[0013] The support mechanism includes a nut, a bearing, and a bearing screw. The support mechanism is fixed on the sliding seat plate and the sliding seat cover plate for carrying the electric gun mechanism, the main body frame, and the circumferential adjustment mechanism. The middle turntable can continuously rotate around the support mechanism between 0° and 50°.

[0014] Preferably, the front obstacle detection mechanism includes a front obstacle detection sensor and a protective cover. The front obstacle detection sensor is connected to the main body frame, and the protective cover is arranged outside the front obstacle detection sensor. The rear obstacle detection mechanism includes two sets of rear obstacle detection sensors and a mounting fixing plate. The mounting fixing plate is connected to the tail of the main body frame, and the rear obstacle detection sensors are arranged on the mounting fixing plate.

[0015] Preferably, the housing includes a gun head cover, a front cover, and a rear cover, and they are respectively fixedly connected to the main body frame to form the housing.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. The present invention can realize the automatic tightening of nuts with large torque (≤800 N·M).

[0018] 2. The present invention can realize the manual continuous adjustment of the center circumference of 8 electric guns with 800 N·M between 204 mm and 230 mm by using the circumferential adjustment mechanism, which is convenient, efficient, and highly practical.

[0019] 3. The present invention can realize the manual continuous adjustment of the tightening device in the circumferential direction between 0° and 50° by using the angle adjustment mechanism, which is convenient for aligning the target and has simple and reliable operation.

[0020] 4. The present invention not only greatly saves labor costs but also significantly improves the tightening quality of large-torque nuts. Description of the Drawings

[0021] Figure 1 is the overall schematic diagram of the present invention;

[0022] Figure 2 is the overall schematic diagram of the internal structure of the present invention;

[0023] Figure 3 is Figure 2 the schematic diagram of the electric gun mechanism in

[0024] Figure 4 is Figure 2 the schematic diagram of the main body frame in

[0025] Figure 5 is Figure 2 the cross-sectional schematic diagram of the circumferential adjustment mechanism in

[0026] Figure 6 is Figure 2 the three-dimensional schematic diagram of the circumferential adjustment mechanism in

[0027] Figure 7 is Figure 2 the schematic diagram of the angle adjustment mechanism in

[0028] Figure 8 For Figure 1 Schematic diagram of the front obstacle detection mechanism in

[0029] Figure 9 For Figure 1 Schematic diagram of the rear obstacle detection mechanism in

[0030] The markings in the figure are: 1. Electric gun mechanism; 101. Sleeve; 102. Elastic head assembly; 103. Electric gun;

[0031] 104. Electric gun fixing plate; 105. Servo motor; 2. Main body frame; 201. Turntable; 202. Handle; 203. Support shaft; 204. Adjusting ring; 205. Middle turntable; 206. Laser aligner; 207. Rear fixing plate; 3. Circumferential adjusting mechanism;

[0032] 301. Cover plate; 302. Adjusting screw; 303. Nylon pad; 304. Adjusting shaft; 305. Tightening screw; 306. Pressing cover plate; 307. Electric gun fixing plate; 4. Angle adjusting mechanism; 401. Hoisting ring fixing part; 402. Suspension mechanism; 4021. Pin; 4022. Nut; 4023. Connecting plate; 403. Ball mechanism; 4031. Ball cover plate; 4032. Universal ball;

[0033] 404. Slide seat plate; 405. Slide seat cover plate; 406. Support mechanism; 4061. Nut; 4062. Bearing;

[0034] 4063. Bearing screw; 5. Front obstacle detection mechanism; 501. Front obstacle detection sensor; 502. Protective cover;

[0035] 6. Operating handle; 7. Rear obstacle detection mechanism; 701. Rear obstacle detection sensor; 702. Mounting fixing plate. Specific implementation mode

[0036] The present invention will be further described below in conjunction with the embodiments in the accompanying drawings.

[0037] Embodiment 1

[0038] As Figure 1-9 shown: A large-torque variable-diameter tire nut assembly device includes a main body and a housing disposed outside the main body. The housing can play a protective role to prevent operators from touching the main body structure; on the main body, an electric gun mechanism 1, a main body frame 2, a circumferential adjusting mechanism 3, an angle adjusting mechanism 4, a front obstacle detection mechanism 5, an operating handle 6, and a rear obstacle detection mechanism 7 are sequentially arranged from left to right.

[0039] The electric gun mechanism 1 is sleeved in the main body frame 2 and penetrates through the main body frame 2. One end of the circumferential adjustment mechanism 3 is connected to the electric gun mechanism 1, and the other end is fixed to the main body frame. The angle adjustment mechanism 4 is arranged on the outer frame of the main body frame 2. The front obstacle detection mechanism 5 is arranged at the rear of the main body frame 2, and the opening direction is the same as that of the electric gun mechanism 1. The rear obstacle detection mechanism 7 is arranged at the tail of the main body frame 2, and the opening direction is opposite to that of the electric gun mechanism 1. One end of the operation handle 6 is connected to the main body frame 2, and the other end passes through the housing and extends to the outside of the housing.

[0040] The electric gun mechanism 1 includes a sleeve 101, an elastic head assembly 102, an electric gun 103, an electric gun fixing plate 104, and a servo motor 105. The elastic head assembly 102 is arranged on one side of the electric gun 103. The sleeve 101 is sleeved on the elastic head assembly 102. The electric gun fixing plate 104 is arranged between the elastic head assembly 102 and the electric gun 103. The servo motor 105 is arranged on the other side of the electric gun 103. The electric gun 103 and the elastic head assembly 102 are connected to the electric gun fixing plate 104, and the electric gun fixing plate 104 is fixed to the main body frame 2.

[0041] The main body frame 2 includes a wheel disc 201, a handle 202, a support shaft 203, an adjustment ring 204, a middle turntable 205, a laser aligner 206, and a rear fixing plate 207. The middle turntable 205 passes through the support shaft 203 and is arranged on one side of the support shaft 203. A wheel disc 201 is arranged at one end of the support shaft 203 close to the middle turntable 205, and a rear fixing plate 207 is arranged at the other end. A handle 202 is further arranged on the wheel disc 201. A laser aligner 206 is arranged at the center of the rear fixing plate 207. An adjustment ring 204 is also arranged at the contact part between the middle turntable 205 and the support shaft 203.

[0042] The circumferential adjustment mechanism 3 includes a cover plate 301, an adjustment screw 302, a nylon pad 303, an adjustment shaft 304, a top screw 305, a pressing cover plate 306, and an electric gun fixing plate 307.

[0043] One end of the electric gun fixing plate 307 is provided with a sleeve, and the other end is provided with a central groove. The adjusting screw 302 is arranged in the central groove. The adjusting shaft 304 is sleeved on the adjusting screw 302, and the adjusting screw 302 can rotate along the adjusting shaft 304. The nylon pad 303 is sleeved on the adjusting screw 302 and the periphery of the adjusting shaft 304. The pressing cover plate 306 is buckled on the electric gun fixing plate 307. A sliding groove is opened in the center of the pressing cover plate 306. The sliding groove covers the central groove, and the adjusting shaft 304 can move along the sliding groove. The cover plate 301 is arranged at the end of the central groove of the electric gun fixing plate 307, covering the pressing cover plate 306 and the electric gun fixing plate 307 at the same time. A through hole is further provided on the cover plate, and the center line of the through hole coincides with the center line of the central groove and the axis line of the adjusting screw 302. The top screw 305 is arranged on the pressing cover plate 306, passes through the pressing cover plate 306 and extends into the central groove of the electric gun fixing plate 307. The cover plate 301 and the top screw 305 abut against the adjusting screw 302, and the adjusting shaft 304 moves horizontally along the sliding groove.

[0044] The angle adjusting mechanism 4 includes a lifting ring fixing member 401, a suspension mechanism 402, a ball mechanism 403, a slide seat plate 404, a slide seat cover plate 405 and a support mechanism 406.

[0045] There are two groups of the lifting ring fixing members 401, which are respectively fixed on the front and rear sides of the angle adjusting mechanism 4. A safety chain is connected to the upper side of the lifting ring fixing member 401 to prevent the whole set of mechanisms from falling during operation. The suspension mechanism 402 includes a pin 4021, a nut 4022 and a connecting plate 4023. The pin 4021 passes through the slide seat plate 404 and the slide seat cover plate 405. Nuts 4022 are arranged at both ends of the pin 4021. The connecting plate 4023 extends upward for connecting an external automation device. The ball mechanism 403 includes a ball cover plate 4031 and a universal ball 4032. The ball mechanism 403 is installed on the slide seat plate 404 and the slide seat cover plate 405.

[0046] The support mechanism 406 includes a nut 4061, a bearing 4062 and a bearing screw 4063. The support mechanism 406 is fixed on the slide seat plate 404 and the slide seat cover plate 405 for carrying the electric gun mechanism 1, the main body frame 2, and the circumferential adjusting mechanism 3. The middle turntable 205 can continuously rotate around the support mechanism 406 between 0 degrees and 50 degrees.

[0047] The front obstacle detection mechanism 5 includes a front obstacle detection sensor 501 and a protective cover 502. The front obstacle detection sensor 501 is connected to the main body frame 2, and the protective cover 502 is arranged outside the front obstacle detection sensor 501. The rear obstacle detection mechanism 7 includes two sets of rear obstacle detection sensors 701 and a mounting fixing plate 702. The mounting fixing plate 702 is connected to the tail of the main body frame 2, and the rear obstacle detection sensors 701 are arranged on the mounting fixing plate 702.

[0048] The housing includes a gun head protective cover, a front protective cover and a rear protective cover, and are respectively fixedly connected to the main body frame to form a housing.

[0049] The working principle of the present invention is as follows:

[0050] As Figure 2-4 shown, the main body part of the present invention includes an electric gun mechanism 1, a main body frame 2, a circumferential adjustment mechanism 3, an angle adjustment mechanism 4, a front obstacle detection mechanism 5, and a rear obstacle detection mechanism 6. Among them, as Figure 4 shown, the main body frame 1 includes a wheel disc 201, a handle 202, a support shaft 203, an adjustment ring 204, a middle turntable 205, a laser aligner 206 and a rear fixing plate 207. The circumferential adjustment mechanism 3 is fixed on the wheel disc 201, and the angle adjustment mechanism 4 is fixed on the middle turntable 205. Among them, as Figure 3 shown, the electric gun mechanism 1 includes a sleeve 101, an elastic head assembly 102, an electric gun 103, an electric gun fixing plate 104, and a servo motor 105. The sleeve 101 can be replaced for different types of nuts. The electric gun mechanism is fixed on the wheel disc 201 through the electric gun fixing plate 307.

[0051] The electric gun mechanism 1 is arranged inside the main body frame 2, and the servo motor 105 at the tail end of the electric gun mechanism is fixed on the rear fixing plate 207. The through hole on the electric gun fixing plate 307 is sleeved on the elastic head assembly 102, and the baffle 104 is connected to the electric gun fixing plate 307.

[0052] As Figure 5 and Figure 6As shown in the figure, the circumferential adjustment mechanism includes a cover plate 301, an adjustment screw 302, a nylon pad 303, an adjustment shaft 304, a locking screw 305, a pressing cover plate 306, and a electric gun fixing plate 307. 8 sets of circumferential adjustment mechanisms 3 are arranged circumferentially and evenly. The pressing cover plate 306 is provided with a stepped hole, and the wheel disc 201 is provided with a mounting seat. The stepped hole and the mounting seat are bolted together to fix the pressing cover plate 306 on the wheel disc 201. The adjustment screw 302 passes through the nylon pad 303 and the adjustment shaft 304, and is blocked by the cover plate 301 and the locking screw 305. It passes through the adjustment shaft 304 and is limited, only allowing the adjustment shaft 304 to move horizontally. The nylon pad 303 is fixed on the electric gun fixing plate 307. By manually adjusting the adjustment screw 302, the adjustment shaft 304 can be driven to move, and then the electric gun fixing plate 307 can be pushed to move, adjusting the axial distance between the elastic head assembly 102 of the electric gun mechanism 1 and the main body frame 2. Furthermore, the diameter of the circle formed by the centers of the cross-sections of the elastic head assemblies 102 of the 8 electric gun mechanisms 1 can be adjusted, so that the diameter of the circle can be continuously adjusted between 204 mm and 230 mm. Since the torque of each electric gun is too large, to prevent the position of the electric gun from changing during operation, after the adjustment is in place, the locking screw 305 is tightened so that the adjustment screw 302 no longer rotates, thereby fixing the elastic head assembly 102 in the electric gun mechanism 1. This mechanism is simple, small in size, flexible in change, and convenient to operate.

[0053] As Figure 7 shown, the angle adjustment mechanism 4 includes a lifting ring fixing part 401, a suspension mechanism 402, a ball mechanism 403, a sliding seat plate 404, a sliding seat cover plate 405, and a support mechanism 406. Two lifting ring fixing parts 401 are respectively fixed on both sides of the mechanism, and a safety chain is connected to the upper side to prevent the whole set of mechanism from falling during operation; the suspension mechanism 402 includes a self-made pin 4021, a nut 4022, and a connecting plate 4023. This mechanism can lift and tighten the equipment as a whole and can be connected to an automated equipment for collaborative operation; the ball mechanism 403 includes a ball cover plate 4031 and universal balls 4032. There are 6 groups of this mechanism, which are symmetrically and evenly arranged on both sides and are respectively installed on the sliding seat plate 404 and the sliding seat cover plate 405, and can assist the operator to rotate the whole set of mechanism; the support mechanism 406 includes a nut 4061, a bearing 4062, and a bearing screw 4063. This mechanism is fixed on the sliding seat plate 404 and the sliding seat cover plate 405, bearing the electric gun mechanism 1, the main body frame 2, the circumferential adjustment mechanism 3, etc. And the middle turntable 205 can continuously rotate around the support mechanism 406 between 0° and 50°, which is convenient for the operator to align 8 nuts at the same time.

[0054] As Figure 8 、 Figure 9 shown, the present invention is provided with front and rear obstacle detection sensors. During the operation of the whole equipment, if a person breaks into the working restricted area, the obstacle detection sensors will sense it and the whole equipment will stop working.

[0055] The working process of the present invention is as follows:

[0056] The present invention can be installed on an external automated device. When tightening, the operator holds the handle 202 and the operating handle 6, and the automated device drives the present invention to the designated position. Since the position of the tire is uncertain each time the vehicle to be assembled reaches the assembly position, the operator needs to adjust the circumferential adjustment mechanism 3 according to the laser aligner 206 once for each product, and the angle adjustment mechanism 4 needs to be adjusted once for each vehicle to ensure that the 8 groups of electric gun mechanisms 1 are aligned with the nut positions. The operator presses the button on the operating handle, and the tightening device works to tighten the 8 groups of nuts synchronously. The present invention has a simple structure, a small volume, is convenient to operate, safe and reliable, and has a high assembly efficiency, making it suitable for current automated production.

Claims

1. A large-torque variable-diameter tire nut assembly device, comprising a main body and a housing arranged outside the main body, characterized in that: An electric gun mechanism, a main body frame, a circumferential adjustment mechanism, an angle adjustment mechanism, a front obstacle detection mechanism, an operation handle, and a rear obstacle detection mechanism are sequentially arranged on the main body from left to right. The electric gun mechanism is sleeved in the main body frame and penetrates through the main body frame. One end of the circumferential adjustment mechanism is connected to the electric gun mechanism, and the other end is fixed to the main body frame. The angle adjustment mechanism is arranged on the outer frame of the main body frame. The front obstacle detection mechanism is arranged at the rear of the main body frame, and the opening direction is the same as that of the electric gun mechanism. The rear obstacle detection mechanism is arranged at the tail of the main body frame, and the opening direction is opposite to that of the electric gun mechanism. One end of the operation handle is connected to the main body frame, and the other end passes through the housing and extends to the outside of the housing. The circumferential adjustment mechanism includes a cover plate, an adjustment screw, a nylon pad, an adjustment shaft, a tightening screw, a pressing cover plate, and an electric gun fixing plate. The angle adjustment mechanism includes a lifting ring fixing part, a suspension mechanism, a ball mechanism, a slide seat plate, a slide seat cover plate, and a support mechanism.

2. The large-torque variable-diameter tire nut assembly device according to claim 1, characterized in that: The electric gun mechanism includes a sleeve, an elastic head assembly, an electric gun, an electric gun fixing plate, and a servo motor. The elastic head assembly is arranged on one side of the electric gun. The sleeve is sleeved on the elastic head assembly. The electric gun fixing plate is arranged between the elastic head assembly and the electric gun. The servo motor is arranged on the other side of the electric gun. The electric gun and the elastic head assembly are connected to the electric gun fixing plate, and the electric gun fixing plate is fixed to the main body frame.

3. The large-torque variable-diameter tire nut assembly device according to claim 1, characterized in that: The main body frame includes a wheel disc, a handle, a support shaft, an adjustment ring, a middle turntable, a laser aligner, and a rear fixing disc. The middle turntable passes through the support shaft and is arranged on one side of the support shaft. A wheel disc is arranged at one end of the support shaft close to the middle turntable, and a rear fixing disc is arranged at the other end. A handle is also arranged on the wheel disc. A laser aligner is arranged at the center of the rear fixing disc. An adjustment ring is also arranged at the contact part between the middle turntable and the support shaft.

4. The large-torque variable-diameter tire nut assembly device according to claim 1, characterized in that: One end of the electric gun fixing plate of the circumferential adjustment mechanism is provided with a sleeve, and a central groove is opened at the other end. The adjustment screw is arranged in the central groove. The adjustment shaft is sleeved with the adjustment screw, and the adjustment screw can rotate along the adjustment shaft. The nylon pad is sleeved on the adjustment screw and the periphery of the adjustment shaft. The pressing cover plate is buckled on the electric gun fixing plate. A chute is opened at the center of the pressing cover plate, and the chute covers the central groove. The adjustment shaft can move along the chute. The cover plate is arranged at the end of the central groove of the electric gun fixing plate, covering both the pressing cover plate and the electric gun fixing plate at the same time. A through hole is also arranged on the cover plate, and the center line of the through hole coincides with the center line of the central groove and the axis line of the adjustment screw. The tightening screw is arranged on the pressing cover plate and passes through the pressing cover plate and extends into the central groove of the electric gun fixing plate. The cover plate and the tightening screw hold the adjustment screw, and the adjustment shaft moves horizontally along the chute.

5. The large-torque variable-diameter tire nut assembly device according to claim 1, characterized in that: The suspension ring fixing parts of the angle adjustment mechanism include two groups, which are respectively fixed on the front and rear sides of the angle adjustment mechanism; a safety chain is connected to the upper side of the suspension ring fixing parts to prevent the whole mechanism from falling during operation; the suspension mechanism includes a pin, a nut and a connecting plate. The pin passes through the slide seat plate and the slide seat cover plate, the nut is arranged at both ends of the pin, and the connecting plate extends upward for connecting an external automation device; the ball mechanism includes a ball cover plate and universal balls, and the ball mechanism is installed on the slide seat plate and the slide seat cover plate. The support mechanism includes a nut, a bearing and a bearing screw rod. The support mechanism is fixed on the slide seat plate and the slide seat cover plate and is used to carry the electric gun mechanism. The main frame and the circumferential adjustment mechanism enable the middle turntable to continuously rotate around the support mechanism between 0° and 50°.

6. The large-torque variable-diameter tire nut assembly device according to claim 1, characterized in that: The front obstacle detection mechanism includes a front obstacle detection sensor and a protective cover. The front obstacle detection sensor is connected to the main frame, and the protective cover is arranged outside the front obstacle detection sensor; the rear obstacle detection mechanism includes two sets of rear obstacle detection sensors and a mounting fixing plate. The mounting fixing plate is connected to the tail of the main frame, and the rear obstacle detection sensors are arranged on the mounting fixing plate.

7. The large-torque variable-diameter tire nut assembly device according to claim 1, characterized in that: The housing includes a gun head cover, a front cover and a rear cover, and is respectively fixedly connected to the main frame to form the housing.

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