Nut tightening device

Abstract

The present invention discloses a nut tightening device, which includes a mounting frame, a positioning mechanism, a nut fixing mechanism, and a tightening mechanism. The mounting frame; the positioning mechanism is used to position a shaft frame; the nut fixing mechanism includes a first fixing assembly and a second fixing assembly. The first fixing assembly includes a connecting frame and a sleeve installed on the connecting frame. The connecting frame is detachably connected to the shaft frame. The sleeve is slidably connected to the connecting frame. The sleeve is provided with a fixing hole for fixing a nut. The second fixing assembly includes a fixing seat. The fixing seat is installed on the shaft frame and is provided with a fixing groove for fixing a nut. The tightening mechanism is used to drive a bolt that cooperates with the nut thread to rotate. Different nuts are fixed respectively by the first fixing assembly and the second fixing assembly. The staff only needs to control the tightening mechanism to tighten the bolt, and does not need to hold a wrench to fix the nut, thereby simplifying the staff's operating process.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile accessories installation, in particular to a nut tightening device. Background Art

[0002] The steering gear of a car is generally installed on a front suspension shaft frame. The steering gear is pre-tightened with bolts and nuts. The operator needs to first hoist the steering gear onto the shaft frame, and then pre-position the steering gear by pre-tightening the bolts and nuts. During the tightening process of the nut, the operator needs to use a wrench to fix the nut to prevent the nut from slipping during the tightening process. The operator also needs to pull the tightening gun to align the tightening gun with the bolt. The operator needs to hold the wrench tightly while controlling the tightening gun to tighten the bolt, which is inconvenient to operate.

[0003] In view of this, it is necessary to provide a new nut tightening device to solve or at least alleviate the above technical defects. Summary of the Invention

[0004] The main purpose of the present invention is to provide a nut tightening device, which aims to solve the technical problem of complicated tightening operation of existing steering gear bolts and nuts.

[0005] In order to achieve the above object, the present invention provides a nut tightening device, which includes:

[0006] A mounting frame, the mounting frame is used to place the well-shaped frame;

[0007] A positioning mechanism, wherein the positioning mechanism is used to position the well frame;

[0008] A nut fixing mechanism, the nut fixing mechanism includes a first fixing assembly and a second fixing assembly, the first fixing assembly includes a connecting frame and a sleeve mounted on the connecting frame, the connecting frame is detachably connected to the well-shaped frame, the sleeve is slidably connected to the connecting frame, and the sleeve is provided with a fixing hole for fixing the nut; the second fixing assembly includes a fixing seat, the fixing seat is mounted on the mounting frame, and the fixing seat is provided with a fixing groove for fixing the nut;

[0009] A tightening mechanism is used to drive a bolt that is threadedly engaged with the nut to rotate.

[0010] In one embodiment, the connecting frame includes a connecting component and a mounting component that are connected to each other, the mounting component includes a mounting part and a sliding part installed on the mounting part, the connecting component includes a connecting part and a clamping part that are connected to each other, the mounting part is connected to the connecting part, the sliding part is slidably connected to the sleeve, and the sleeve slides relative to the sliding part so that the fixing hole maintains or releases the fixation of the nut; the clamping part is used to clamp and cooperate with the clamping hole provided on the well-shaped frame.

[0011] In one embodiment, the first fixing assembly further includes a first elastic member, one end of the first elastic member is connected to the sliding member, the other end of the first elastic member is connected to the sleeve, and the first elastic member is used to drive the sleeve to move toward the nut.

[0012] In one embodiment, the sliding member includes a first sliding portion and a second sliding portion connected to each other, the first sliding portion is provided with a positioning groove, the side wall of the sleeve is provided with a waist-shaped hole, the sleeve is sleeved on the outer periphery of the first sliding portion, and the sleeve is inserted into the positioning groove through the waist-shaped hole by a pin so that the sleeve and the first sliding portion can slide together; one end of the first elastic member is connected to the first sliding portion; the mounting member is provided with a through hole for the second sliding portion to pass through, and the first fixing assembly also includes a second elastic member, one end of the second elastic member is connected to the second sliding portion, and the other end of the second elastic member is connected to the mounting member.

[0013] In one embodiment, the fixing seat includes a main body, a fixing part and two limiting parts, the two limiting parts are both installed on the well-shaped frame, the fixing part is connected to the main body, the fixing part is provided with the fixing groove, the two limiting parts are both connected to the main body, and the two limiting parts and the main body form an accommodating space, the accommodating space is used to accommodate the positioning studs of the steering gear, so that the two limiting parts limit the rotation angle of the fixing part relative to the well-shaped frame.

[0014] In one embodiment, a magnetic element is provided on the bottom surface of the limiting portion, and the magnetic element is used to absorb the well-shaped frame.

[0015] In one embodiment, the positioning mechanism includes a first positioning assembly, the first positioning assembly includes a first lifting drive, a first positioning drive, and a positioning plate connected to the output shaft of the first positioning drive, the first lifting drive is installed on the mounting frame, the output shaft of the first lifting drive is connected to the first positioning drive, and the first positioning drive drives the positioning plate to move so that the positioning plate positions the well frame.

[0016] In one embodiment, the positioning mechanism also includes a second positioning assembly, which includes a second lifting drive and a positioning pin connected to the output shaft of the second lifting drive, and the second lifting drive drives the positioning pin to rise and fall so that the positioning pin extends out of or into the positioning hole of the well frame.

[0017] In one embodiment, the second positioning assembly further includes a limiting block, the positioning pin passes through the limiting block, and the size of the limiting block is larger than the size of the positioning hole, so as to limit the stroke of the positioning pin.

[0018] In one embodiment, the tightening mechanism includes a third lifting drive member and a tightening gun installed on the output shaft of the third lifting drive member. The number of the tightening guns is at least two, and at least two tightening guns are respectively provided corresponding to one of the nut.

[0019] In the above technical solution of the present invention, the positioning mechanism positions the shaft frame located on the mounting frame, and the staff hoist the steering gear onto the shaft frame. The steering gear and the shaft frame are connected by bolts and nuts. The staff first pre-tightens the nuts on each bolt at the connection, and then installs the connecting frame on the shaft frame. The sleeve is covered on the pre-tightened nut through the sliding connection of the sleeve and the connecting piece, so that the nut covered by the sleeve is located in the fixing hole; then the other nut is fixed through the fixing seat so that the nut is located in the fixing groove; after the pre-tightened nut is fixed, the staff controls the tightening mechanism to tighten the bolt. Since the nut is fixed, the nut will not rotate relative to the bolt while the tightening mechanism drives the bolt to rotate, thereby realizing the tightening of the bolt and the nut; and during the tightening process, the staff only needs to control the tightening mechanism to tighten the bolt, and does not need the staff to hold a wrench to fix the nut, thereby simplifying the staff's operating procedures. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0021] Figure 1 This is a structural schematic diagram of a nut tightening device according to an embodiment of the present invention;

[0022] Figure 2 This is a structural schematic diagram of a nut tightening device according to an embodiment of the present invention;

[0023] Figure 3This is a schematic structural diagram of a first fixing assembly according to an embodiment of the present invention;

[0024] Figure 4 This is a partial structural diagram of a first fixing assembly according to an embodiment of the present invention;

[0025] Figure 5 This is a schematic structural diagram of a second fixing assembly according to an embodiment of the present invention;

[0026] Figure 6 This is a schematic structural diagram of a second fixing assembly according to an embodiment of the present invention;

[0027] Figure 7 The figure is a partial structural diagram of a nut tightening device according to an embodiment of the present invention.

[0028] Description of Figure Numbers:

[0029] 1 Nut tightening device 11 Mounting bracket 12 Positioning mechanism 121 First positioning component 1211 First lifting drive member 1212 First positioning drive member 1213 Positioning plate 122 Second positioning component 1221 Second lifting drive member 1222 positioning pins 1223 Limit block 13 Nut fixing mechanism 14 First fixing component 141 Connecting frame 142 Connecting parts 143 Connectors 144 Snap-on parts 145 Mounting Parts 146 Mounting parts 147 Sliders 1471 First sliding part 1472 Second sliding part 148 Handle parts 149 sleeve 151 first elastic member 152 Second elastic member 16 Second fixing component 161 Fixed seat 1611 main body 1612 Fixed part 1613 Limiting part 162 handle 17 Tightening mechanism 171 The third lifting drive member 172 Tightening gun 182 Fixed slot 20 Accommodation space 21 Magnetic parts 22 Mounting plate 3 Well frame 31 Positioning hole 32 Card hole 4 Steering gear

[0030] The realization of the objectives, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0032] It should be noted that all directional indications (such as up, down, etc.) in the embodiments of the present invention are only used to explain the position of the user in a specific posture (such as the attached Figure 1 The relative position relationship and movement conditions of the components below are shown. If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include at least one of these features.

[0034] Moreover, the technical solutions between the various embodiments of the present invention can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] The present invention provides a nut tightening device 1, such as Figure 1 、 3 As shown in Figure 5, the nut tightening device 1 is used to tighten the nuts connecting the derrick 3 and the steering gear 4. The nut tightening device 1 includes a mounting frame 11, a positioning mechanism 12, a nut fixing mechanism 13 and a tightening mechanism 17, the mounting frame 11; the positioning mechanism 12 is used to position the derrick 3; the nut fixing mechanism 13 includes a first fixing component 14 and a second fixing component 16, the first fixing component 14 includes a connecting frame 141 and a sleeve 149 installed on the connecting frame 141, the connecting frame 141 is detachably connected to the derrick 3, the sleeve 149 is slidably connected to the connecting frame 141, and the sleeve 149 is provided with a fixing hole for fixing the nut; the second fixing component 16 includes a fixing seat 161, the fixing seat 161 is installed on the derrick 3, and the fixing seat 161 is provided with a fixing groove 182 for fixing the nut; the tightening mechanism 17 is used to drive the bolt that cooperates with the nut thread to rotate.

[0036] Among them, the positioning mechanism 12 positions the shaft frame 3 located on the mounting frame 11, and the staff hoist the steering gear 4 onto the shaft frame 3. The steering gear 4 and the shaft frame 3 are connected by bolts and nuts. The staff first pre-tightens the nuts on each bolt at the connection, and then installs the connecting frame 141 on the shaft frame 3. The sleeve 149 is covered on the pre-tightened nut through the sliding connection between the sleeve 149 and the connecting piece 143, so that the nut covered by the sleeve 149 is located in the fixing hole; then fix another nut through the fixing seat 161 so that the nut is located in the fixing groove 182; after the pre-tightened nut is fixed, the staff controls the tightening mechanism 17 to tighten the bolt. Since the nut is fixed, the nut will not rotate relative to the bolt while the tightening mechanism 17 drives the bolt to rotate, thereby realizing the tightening of the bolt and the nut; and during the tightening process, the staff only needs to control the tightening mechanism 17 to tighten the bolt, and does not need the staff to hold a wrench to fix the nut, thereby simplifying the staff's operating procedures. It should be noted that the sliding direction of the sleeve 149 is up and down. When the connecting frame 141 is installed on the well-shaped frame 3, the sleeve 149 slides relative to the connecting frame 141 under the action of gravity and covers the pre-tightened nut; even if the sleeve 149 fails to cover the pre-tightened nut smoothly, as the tightening mechanism 17 drives the bolt to rotate, the rotation of the bolt will drive the nut that is not fixed to rotate, so that the nut can smoothly enter the fixing hole; therefore, there is basically no need for manual operation of the staff to put the sleeve 149 on the outside of the nut, which simplifies the staff's operating procedures.

[0037] According to one embodiment of the present invention, the inner wall of the fixing groove 182 near its top is raised inward to form a limiting boss to prevent the nut from rising and breaking away from the restraint of the fixing groove 182 during the tightening process. It should be noted that the limiting boss does not close the opening above the fixing groove 182, but rather reserves space for the bolt to pass through.

[0038] like Figure 3 and Figure 4 As shown, the connecting frame 141 includes a connecting member 142 and a mounting member 145 that are interconnected. The mounting member 145 includes a mounting member 146 and a sliding member 147 mounted on the mounting member 146. The connecting member 142 includes a connecting member 143 and a clamping member 144 that are interconnected. The mounting member 146 is connected to the connecting member 143. The sliding member 147 is slidably connected to the sleeve 149. The sleeve 149 slides relative to the sliding member 147 to maintain or release the fixation of the nut in the fixing hole. The clamping member 144 is used to engage with the clamping hole 32 provided on the shaft frame 3. Compared to installing the connecting member 143 on the shaft frame 3 with bolts, by providing the clamping member 144 to engage with the clamping hole 32, the operator can more easily install the connecting frame 141 on the shaft frame 3, which is simple to operate. According to one embodiment of the present invention, the number of the clamping parts 144 is at least two, and each clamping part 144 has a corresponding clamping hole 32. By providing at least two clamping parts 144 to engage with the corresponding clamping holes 32, after each clamping part 144 is engaged with the corresponding clamping hole 32, the positioning of the connecting frame 141 is also completed, thereby ensuring the positioning of the sleeve 149 and the corresponding nut, and further ensuring that the sleeve 149 can be smoothly sleeved on the nut.

[0039] According to another embodiment of the present invention, the connecting frame 141 further includes a handle component 148. The number of the handle components 148 is at least two, and preferably two handle components 148 are provided to facilitate the staff to grasp.

[0040] The first fixing assembly 14 further includes a first elastic member 151, one end of which is connected to the sliding member 147, and the other end of which is connected to the sleeve 149. The first elastic member 151 is used to drive the sleeve 149 toward the nut. The first elastic member 151 can be a spring, such as a gas spring or a compression spring. When the spring is in a compressed state, the spring applies a force to the sleeve 149 in the direction toward the nut, thereby pushing the sleeve 149 to cover the nut. After the clamping member 144 is engaged with the clamping hole 32, the sleeve 149 is acted upon by gravity and the spring force to approach the nut. If the sleeve 149 fails to cover the nut smoothly, when the tightening mechanism 17 drives the bolt to rotate, the sleeve 149 can be more smoothly covered on the nut because it is acted upon by both gravity and the spring force, compared to if the sleeve 149 relied solely on gravity. It should be noted that the connector 143 , the sleeve 149 and the nut are all located above the well-shaped frame 3 , so that the direction of the elastic force on the sleeve 149 is substantially consistent with the direction of the gravity on the sleeve 149 .

[0041] Furthermore, the sliding member 147 includes a first sliding portion 1471 and a second sliding portion 1472 that are connected to each other. The first sliding portion 1471 is provided with a positioning groove. The side wall of the sleeve 149 is provided with a waist-shaped hole. The sleeve 149 is sleeved on the outer periphery of the first sliding portion 1471. The sleeve 149 is inserted into the positioning groove through the waist-shaped hole by a pin so that the sleeve 149 and the first sliding portion 1471 can be slidably matched; one end of the first elastic member 151 is connected to the first sliding portion 1471; the mounting member 146 is provided with a through hole for the second sliding portion 1472 to pass through. The first fixing component 14 also includes a second elastic member 152, one end of the second elastic member 152 is connected to the second sliding portion 1472, and the other end of the second elastic member 152 is connected to the mounting member 146. By providing a through hole that slidably engages with the second sliding portion 1472, and by adding a second elastic member 152 to connect the second sliding portion 1472 and the mounting member 146, the second sliding portion 1472 can slide relative to the mounting member 146 while maintaining a connection with the mounting member 146. Compared to a fixed connection between the second sliding portion 1472 and the mounting member 146, the second sliding portion 1472 can slide relative to the mounting member 146, and the sleeve 149 can slide relative to the first sliding portion 1471, which increases the range of movement of the sleeve 149 and facilitates the sleeve 149 to cover the nut when the tightening mechanism 17 drives the nut to rotate by driving the bolt. It should be noted that the through hole and the second sliding portion 1472 have a clearance fit, so that the second sliding portion 1472 can not only slide relative to the through hole, but also has a certain swing margin relative to the through hole, so that the sleeve 149 can be more flexibly mounted on the nut, avoiding poor installation caused by the sleeve 149 not being able to be smoothly mounted on the nut.

[0042] According to one embodiment of the present invention, the second sliding portion 1472 may be provided with a sliding groove, and the outer wall of the sleeve 149 may be provided with a threaded hole. The sleeve 149 is screwed through the threaded hole and extends into the sliding groove to slide with the sliding groove, thereby realizing the sliding cooperation between the sleeve 149 and the second sliding portion 1472.

[0043] like Figure 5 and Figure 6 As shown, the fixing seat 161 includes a main body 1611, a fixing portion 1612 and two limiting portions 1613. The two limiting portions 1613 are both installed on the well-shaped frame 3. The fixing portion 1612 is connected to the main body 1611. The fixing portion 1612 is provided with a fixing groove 182. The two limiting portions 1613 are both connected to the main body 1611, and the two limiting portions 1613 and the main body 1611 form an accommodating space 20. The accommodating space 20 is used to accommodate the positioning studs of the steering gear 4 so that the two limiting portions 1613 limit the rotation angle of the fixing portion 1612 relative to the well-shaped frame 3. The fixing groove 182 of the fixing portion 1612 is used to fix the nut. The positioning stud of the steering gear 4 is located in the accommodating space 20. The two limiting portions 1613 are respectively located on both sides of the positioning stud, so that when the tightening mechanism 17 drives the bolt to rotate, the limiting portion 1613 limits the rotation of the fixing portion 1612 relative to the well frame 3, thereby ensuring that the nut will not rotate relative to the bolt, so that the bolt can be smoothly tightened under the drive of the tightening mechanism 17.

[0044] like Figure 6 As shown, the bottom surface of the limiting portion 1613 is provided with a magnetic member 21, which is used to be attracted to the shaft frame 3. By adding the magnetic member 21, the limiting portion 1613 can be attracted to the shaft frame 3, achieving a detachable connection between the limiting portion 1613 and the shaft frame 3 and facilitating the disassembly of the fixing seat 161. At the same time, the magnetic member 21 is attracted to the shaft frame 3, causing the shaft frame 3 to generate an attractive force on the limiting portion 1613, thereby enhancing the static friction between the limiting portion 1613 and the shaft frame 3, making it less likely for the limiting portion 1613 to rotate relative to the shaft frame 3, thereby ensuring that the bolt and nut can be tightened smoothly.

[0045] According to one embodiment of the present invention, the second fixing assembly 16 also includes a handle 162, which is connected to the column for easy holding by the staff, so that the staff can use the lever principle to more easily remove the second fixing assembly 16 adsorbed on the well frame 3 through the handle 162.

[0046] like Figure 1As shown, the positioning mechanism 12 includes a first positioning assembly 121, which includes a first lifting drive 1211, a first positioning drive 1212, and a positioning plate 1213 connected to the output shaft of the first positioning drive 1212. The first lifting drive 1211 is mounted on the mounting frame 11, and the output shaft of the first lifting drive 1211 is connected to the first positioning drive 1212. The first positioning drive 1212 drives the positioning plate 1213 to move so that the positioning plate 1213 positions the shaft frame 3. When the shaft frame 3 is placed on the mounting frame 11, the first lifting drive 1211 drives the first positioning drive 1212 to descend, and the first positioning drive 1212 contracts, thereby driving the positioning plate 1213 to roughly position the shaft frame 3. It should be noted that the output shaft of the first lifting drive member 1211 is provided with a mounting plate 22, and the first positioning drive member 1212 is installed on the mounting plate 22. The first positioning drive member 1212 drives its output shaft to retract so that the positioning plate 1213 and the mounting plate 22 clamp the derrick frame 3, thereby realizing the rough positioning of the derrick frame 3.

[0047] like Figure 1 and Figure 7 As shown, the positioning mechanism 12 further includes a second positioning assembly 122, which includes a second lifting drive 1221 and a positioning pin 1222 connected to the output shaft of the second lifting drive 1221. The second lifting drive 1221 drives the positioning pin 1222 to rise and fall, so that the positioning pin 1222 extends out of or extends into the positioning hole 31 of the shaft frame 3. By providing the second lifting drive 1221 to drive the positioning pin 1222 into the positioning hole 31, the shaft frame 3 is further positioned in cooperation with the first positioning assembly 121, thereby improving the positioning accuracy of the shaft frame 3.

[0048] like Figure 7 As shown, the second positioning assembly 122 further includes a limit block 1223, through which the positioning pin 1222 is inserted. The limit block 1223 is larger than the positioning hole 31, thereby limiting the travel of the positioning pin 1222. By providing the limit block 1223 around the periphery of the positioning pin 1222, since the limit block 1223 is larger than the positioning hole 31, the limit block 1223 does not pass through the positioning hole 31 but abuts against the shaft frame 3, thereby limiting the downward travel of the positioning pin 1222. Furthermore, the abutment between the limit block 1223 and the shaft frame 3 can also reduce shaking of the shaft frame 3 during the bolt tightening process.

[0049] like Figure 1 and Figure 2As shown, the tightening mechanism 17 includes a third lifting drive 171 and a tightening gun 172 mounted on the output shaft of the third lifting drive 171. There are at least two tightening guns 172, each corresponding to a nut. It should be noted that there is at least one first fixing assembly 14 and at least one second fixing assembly 16. By providing at least two tightening guns 172, multiple bolts can be tightened simultaneously, thereby improving the bolt tightening efficiency and, in turn, the installation efficiency of the steering gear 4. It should be noted that the first lifting drive 1211, the second lifting drive 1221, and the third lifting drive 171 can be pneumatic cylinders or hydraulic cylinders, etc.

[0050] The above are only preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made based on the contents of the present invention's description and drawings, or direct / indirect applications in other related technical fields within the concept of the present invention are included in the patent protection scope of the present invention.

Claims

1. A nut tightening device for tightening nuts connecting a derrick and a steering gear, characterized in that: include: A mounting frame, the mounting frame is used to place the well-shaped frame; A positioning mechanism, the positioning mechanism is used to position the well frame; A nut fixing mechanism, the nut fixing mechanism includes a first fixing assembly and a second fixing assembly, the first fixing assembly includes a connecting frame and a sleeve mounted on the connecting frame, the connecting frame is detachably connected to the well-shaped frame, the sleeve is slidably connected to the connecting frame, and the sleeve is provided with a fixing hole for fixing the nut; the second fixing assembly includes a fixing seat, the fixing seat is mounted on the well-shaped frame, and the fixing seat is provided with a fixing groove for fixing the nut; a tightening mechanism, the tightening mechanism being used to drive a bolt threadedly engaged with the nut to rotate; The connecting frame includes a connecting component and a mounting component connected to each other, the mounting component includes a mounting member and a sliding member mounted on the mounting member, the connecting component includes a connecting member and a clamping member connected to each other, the mounting member is connected to the connecting member, the sliding member is slidably connected to the sleeve, and the sleeve slides relative to the sliding member to enable the fixing hole to maintain or release the fixation of the nut; the clamping member is used to engage with the clamping hole provided on the well-shaped frame; The first fixing assembly further includes a first elastic member, one end of the first elastic member is connected to the sliding member, and the other end of the first elastic member is connected to the sleeve, and the first elastic member is used to drive the sleeve to move toward the nut; The sliding member includes a first sliding portion and a second sliding portion connected to each other, the first sliding portion is provided with a positioning groove, the side wall of the sleeve is provided with a waist-shaped hole, the sleeve is sleeved on the periphery of the first sliding portion, the sleeve is inserted into the positioning groove through the waist-shaped hole by a pin, so that the sleeve and the first sliding portion are slidably matched; one end of the first elastic member is connected to the first sliding portion; the mounting member is provided with a through hole for the second sliding portion to pass through, the first fixing assembly further includes a second elastic member, one end of the second elastic member is connected to the second sliding portion, and the other end of the second elastic member is connected to the mounting member; The fixing seat includes a main body, a fixing portion and two limiting portions, the two limiting portions are both mounted on the well-shaped frame, the fixing portion is connected to the main body, the fixing portion is provided with the fixing groove, the two limiting portions are both connected to the main body, and the two limiting portions and the main body form an accommodating space, the accommodating space is used to accommodate the positioning stud of the steering gear, so that the two limiting portions limit the rotation angle of the fixing portion relative to the well-shaped frame; The positioning mechanism includes a first positioning assembly, which includes a first lifting drive, a first positioning drive, and a positioning plate connected to the output shaft of the first positioning drive. The first lifting drive is installed on the mounting frame, and the output shaft of the first lifting drive is connected to the first positioning drive. The first positioning drive drives the positioning plate to move so that the positioning plate positions the well frame.

2. The nut tightening device according to claim 1, characterized in that: The bottom surface of the limiting portion is provided with a magnetic attraction component, and the magnetic attraction component is used to adsorb the well-shaped frame.

3. The nut tightening device according to claim 1, characterized in that: The positioning mechanism also includes a second positioning assembly, which includes a second lifting drive and a positioning pin connected to the output shaft of the second lifting drive. The second lifting drive drives the positioning pin to rise and fall so that the positioning pin extends out of or into the positioning hole of the well frame.

4. The nut tightening device according to claim 3, characterized in that: The second positioning assembly further includes a limiting block, the positioning pin is passed through the limiting block, and the size of the limiting block is larger than the size of the positioning hole, so as to limit the stroke of the positioning pin.

5. The nut tightening device according to claim 3, characterized in that: The tightening mechanism includes a third lifting drive member and a tightening gun installed on the output shaft of the third lifting drive member. The number of the tightening guns is at least two, and at least two of the tightening guns are respectively provided corresponding to one of the nut.

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