CN218311923U

CN218311923U - Nut tightening device

Info

Publication number: CN218311923U
Application number: CN202223015232.3U
Authority: CN
Inventors: 连庆辉; 马骥卿
Original assignee: GAC Toyota Motor Co Ltd
Current assignee: GAC Toyota Motor Co Ltd
Priority date: 2022-11-11
Filing date: 2022-11-11
Publication date: 2023-01-17
Anticipated expiration: 2032-11-11

Abstract

The utility model discloses a nut tightening device, which comprises a mounting rack, a positioning mechanism, a nut fixing mechanism, a tightening mechanism and a mounting rack; the positioning mechanism is used for positioning the well-shaped frame; the nut fixing mechanism comprises a first fixing component and a second fixing component, the first fixing component comprises a connecting frame and a sleeve arranged on the connecting frame, the connecting frame is detachably connected with the well-shaped frame, the sleeve is in sliding connection with the connecting frame, and the sleeve is provided with a fixing hole for fixing a nut; the second fixing component comprises a fixing seat, the fixing seat is installed on the well-shaped frame, and a fixing groove for fixing the nut is formed in the fixing seat; the tightening mechanism is used for driving the bolt in threaded fit with the nut to rotate. The first fixing component and the second fixing component are used for fixing different nuts respectively, the worker only needs to control the screwing mechanism to screw the bolt tightly, and the worker does not need to hold a wrench to fix the nut, so that the operation flow of the worker is simplified.

Description

Nut tightening device

Technical Field

The utility model relates to an auto-parts installs technical field, especially relates to a nut screws up device.

Background

The steering gear of car is generally installed on the well-shaped frame of front overhang, the steering gear carries out the pretension through bolt and nut, the operator needs to carry the steering gear to the well-shaped frame with the elder generation earlier, then carry out the prepositioning to the steering gear through the pretension of bolt and nut, need pass through the operator with spanner fixed nut in the tightening process to the nut, prevent that the nut from skidding appearing in the tightening process, the operator still need pull the tightening gun again, make the tightening gun and bolt counterpoint, the operator needs to control the tightening gun and tighten the bolt while tightly holding the spanner, it is inconvenient to operate.

In view of the above, there is a need for a new nut tightening device that solves or at least alleviates the above-mentioned technical drawbacks.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a device is screwed up to nut aims at solving the current complex operation's of screwing up technical problem that turns to machine bolt and nut now.

In order to achieve the above object, the utility model provides a nut tightening device, nut tightening device includes:

the mounting rack is used for placing the well-shaped rack;

the positioning mechanism is used for positioning the well-shaped frame; .

The nut fixing mechanism comprises a first fixing component and a second fixing component, the first fixing component comprises a connecting frame and a sleeve arranged on the connecting frame, the connecting frame is detachably connected with the well-shaped frame, the sleeve is in sliding connection with the connecting frame, and the sleeve is provided with a fixing hole for fixing the nut; the second fixing assembly comprises a fixing seat, the fixing seat is mounted on the mounting frame, and a fixing groove for fixing the nut is formed in the fixing seat;

and the tightening mechanism is used for driving the bolt in threaded fit with the nut to rotate.

In one embodiment, the connecting frame comprises a connecting part and a mounting part which are connected with each other, the mounting part comprises a mounting part and a sliding part mounted on the mounting part, the connecting part comprises a connecting part and a clamping part which are connected with each other, the mounting part is connected with the connecting part, the sliding part is connected with the sleeve in a sliding way, and the sleeve slides relative to the sliding part to enable the fixing hole to hold or release the nut; the clamping piece is used for being matched with a clamping hole arranged on the well-shaped frame in a clamping mode.

In an embodiment, 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 configured to drive the sleeve to move toward the nut.

In one embodiment, the sliding part comprises a first sliding part and a second sliding part which are connected with each other, the first sliding part 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 part, and the sleeve penetrates through the waist-shaped hole by a pin and is inserted into the positioning groove, so that the sleeve is in sliding fit with the first sliding part; one end of the first elastic piece is connected with the first sliding part; the through-hole that supplies the second sliding part passes is seted up to the installed part, first fixed subassembly still includes the second elastic component, the one end of second elastic component with the second sliding part is connected, the other end of second elastic component with the installed part is connected.

In an embodiment, the fixing seat includes a main body, a fixing portion and two limiting portions, the two limiting portions are mounted on the shaft-shaped frame, the fixing portion is connected to the main body, the fixing portion has the fixing groove, the two limiting portions are connected to the main body, and an accommodating space is defined by the two limiting portions and the main body and used for accommodating the positioning stud of the steering gear, so that the two limiting portions limit the rotation angle of the fixing portion relative to the shaft-shaped frame.

In one embodiment, a magnetic element is disposed on a bottom surface of the limiting portion, and the magnetic element is used for attracting the well-shaped frame.

In an embodiment, the positioning mechanism includes a first positioning assembly, the first positioning assembly includes a first lifting driving member, a first positioning driving member, and a positioning plate connected to an output shaft of the first positioning driving member, the first lifting driving member is mounted on the mounting frame, the output shaft of the first lifting driving member is connected to the first positioning driving member, and the first positioning driving member drives the positioning plate to move, so that the positioning plate positions the well-shaped frame.

In an embodiment, the positioning mechanism further includes a second positioning assembly, the second positioning assembly includes a second lifting driving member and a positioning pin connected to an output shaft of the second lifting driving member, and the second lifting driving member drives the positioning pin to lift, so that the positioning pin extends out of or into the positioning hole of the shaft frame.

In an embodiment, the second positioning assembly further includes a limiting block, the positioning pin is disposed through the limiting block, and the size of the limiting block is larger than that of the positioning hole, so as to limit the stroke of the positioning pin.

In one embodiment, the tightening mechanism comprises a third lifting driving piece and tightening guns mounted on an output shaft of the third lifting driving piece, the number of the tightening guns is at least two, and the at least two tightening guns are respectively arranged corresponding to one nut.

In the above technical solution of the utility model, the positioning mechanism positions the shaft-shaped frame on the mounting bracket, the worker hangs the steering gear onto the shaft-shaped frame, the steering gear and the shaft-shaped frame are connected through the bolt and the nut, the worker pre-screws the nuts on the bolts at the connection position, and then installs the connection frame on the shaft-shaped frame, the sleeve cover is arranged on the pre-screwed nuts through the sliding connection of the sleeve and the connection piece, so that the nuts covered by the sleeve are positioned in the fixing hole; fixing another nut through the fixing seat so that the nut is positioned in the fixing groove; after the pre-tightened nut is fixed, a worker controls the tightening mechanism to tighten the bolt, and the nut is fixed, so that the nut cannot rotate relative to the bolt while the tightening mechanism drives the bolt to rotate, and the bolt and the nut are tightened; and in the screwing process, the worker only needs to control the screwing mechanism to screw the bolt, and does not need to hold a wrench to fix the nut, so that the operation flow of the worker is simplified.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is also possible for those skilled in the art to obtain other drawings in the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural view of a nut tightening device according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a nut tightening device according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a first fixing assembly according to an embodiment of the present invention;

fig. 4 is a partial schematic structural view of a first fixing assembly according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a second fixing assembly according to an embodiment of the present invention;

fig. 6 is a schematic structural view of a second fixing assembly according to an embodiment of the present invention;

fig. 7 is a partial schematic structural view of a nut tightening device according to an embodiment of the present invention.

The reference numbers illustrate:

1	nut tightening device	11	Mounting rack
				12	Positioning mechanism	121	A first positioning component
1211	First lifting driving member	1212	First positioning driving member
				1213	Positioning plate	122	Second positioning assembly
1221	Second lifting driving member	1222	Locating pin
				1223	Limiting block	13	Nut fixing mechanism
14	First fixing component	141	Connecting frame
				142	Connecting part	143	Connecting piece
144	Clamping piece	145	Mounting component
				146	Mounting piece	147	Sliding member
1471	First sliding part	1472	Second sliding part
				148	Handle part	149	Sleeve barrel
151	First elastic member	152	Second elastic member
				16	Second fixing component	161	Fixed seat
1611	Main body	1612	Fixing part
				1613	Limiting part	162	Handle piece
17	Tightening mechanism	171	Third lifting driving member
				172	Tightening gun	182	Fixing groove
20	Accommodation space	21	Magnetic part
				22	Mounting plate	3	Well-shaped frame
31	Locating hole	32	Clamping hole
				4	Steering gear

The purpose of the present invention, its functional features and advantages will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper and lower 8230; etc.) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in fig. 1), and if the specific posture is changed, the directional indicator is changed accordingly.

Furthermore, descriptions in the present application as to "first," "second," etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" can include at least one of the feature either explicitly or implicitly.

Moreover, the technical solutions between the embodiments of the present invention can be combined with each other, but it is necessary to use a person of ordinary skill in the art as a basis for realizing the combination, and when the technical solutions are combined and contradicted with each other or cannot be realized, the combination of the technical solutions should not exist, and is not within the protection scope of the present invention.

The utility model provides a nut tightening device 1, as shown in figures 1, 3 and 5, the nut tightening device 1 is used for tightening the nut connecting a well-shaped frame 3 and a steering gear 4, the nut tightening device 1 comprises an installation frame 11, a positioning mechanism 12, a nut fixing mechanism 13, a tightening mechanism 17 and the installation frame 11; the positioning mechanism 12 is used for positioning the well-shaped frame 3; the nut fixing mechanism 13 comprises a first fixing component 14 and a second fixing component 16, the first fixing component 14 comprises a connecting frame 141 and a sleeve 149 arranged on the connecting frame 141, the connecting frame 141 is detachably connected with the well-shaped frame 3, the sleeve 149 is in sliding connection with the connecting frame 141, and the sleeve 149 is provided with a fixing hole for fixing a nut; the second fixing assembly 16 includes a fixing seat 161, the fixing seat 161 is installed on the shaft frame 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 in rotation which is threadedly engaged with the nut.

The positioning mechanism 12 positions the well frame 3 on the mounting frame 11, a worker hoists the steering gear 4 onto the well frame 3, the steering gear 4 and the well frame 3 are connected through bolts and nuts, the worker firstly pre-screws the nuts on the bolts at the connection part, then the connecting frame 141 is mounted on the well frame 3, the sleeve 149 is covered on the pre-screwed nuts through the sliding connection of the sleeve 149 and the connecting piece 143, so that the nuts covered by the sleeve 149 are located in the fixing holes; fixing another nut through the fixing seat 161 to make the nut located in the fixing groove 182; after the pre-tightened nut is fixed, the worker controls the tightening mechanism 17 to tighten the bolt, and the nut is fixed, so that the nut cannot rotate relative to the bolt while the tightening mechanism 17 drives the bolt to rotate, and the bolt and the nut are tightened; in the screwing process, a worker only needs to control the screwing mechanism 17 to screw the bolt, and does not need to hold a wrench to fix the nut, so that the operation flow of the worker is simplified. It should be noted that, the sliding direction of the sleeve 149 is up and down sliding, when the connecting frame 141 is installed on the shaft frame 3, the sleeve 149 slides relative to the connecting frame 141 under the action of gravity and covers the nut which is pre-tightened; even if the sleeve 149 is not smoothly covered on the pre-tightened nut, the rotation of the bolt drives the nut which is not fixed to rotate along with the rotation of the bolt driven by the tightening mechanism 17, so that the nut can smoothly enter the fixing hole; therefore, the sleeve 149 is sleeved on the periphery of the nut, manual operation of workers is basically not needed, and the operation process of the workers is simplified.

According to the utility model discloses an embodiment, the inner wall that fixed slot 182 is close to its top is inside protruding to form spacing boss for avoid the nut to rise to the phenomenon emergence that breaks away from the restriction of fixed slot 182 in screwing up the in-process. It should be noted that the limiting boss does not close the opening above the fixing groove 182, but reserves a space for the bolt to pass through.

As shown in fig. 3 and 4, the connecting frame 141 includes a connecting part 142 and a mounting part 145 connected to each other, the mounting part 145 includes a mounting part 146 and a sliding part 147 mounted to the mounting part 146, the connecting part 142 includes a connecting part 143 and a clamping part 144 connected to each other, the mounting part 146 is connected to the connecting part 143, the sliding part 147 is connected to a sleeve 149 in a sliding manner, and the sleeve 149 slides relative to the sliding part 147 to enable the fixing hole to hold or release the nut; the clip member 144 is used to engage with the clip hole 32 of the shaft 3. Compare in installing connecting piece 143 in well shape frame 3 through the bolt, through setting up joint spare 144 and the cooperation of joint hole 32 joint, the staff can be more light install link 141 on well shape frame 3 easy operation. According to the utility model discloses an embodiment, the quantity of joint spare 144 is at least two, and each joint spare 144 all has the joint hole 32 that corresponds the setting with it, through setting up two at least joint spare 144 and the cooperation of the joint hole 32 joint that corresponds for each joint spare 144 is accomplished the joint cooperation back with the joint hole 32 that corresponds and also is accomplished the location to link 141 by the way, thereby has guaranteed sleeve 149 and the location that corresponds the nut, and then guarantees that sleeve 149 can establish smoothly on the nut.

According to another embodiment of the present invention, the connecting frame 141 further comprises at least two handle members 148, and preferably two handle members 148 are provided for the connecting frame 148, so that the operator can conveniently grip the connecting frame by providing two handle members 148.

The first fixing assembly 14 further includes a first elastic member 151, one end of the first elastic member 151 is connected to the sliding member 147, the other end of the first elastic member 151 is connected to the sleeve 149, and the first elastic member 151 is used to drive the sleeve 149 to move toward the nut. The first elastic element 151 may be a spring, wherein the spring may be a gas spring or a compression spring, etc., and the spring is in a compressed state and applies a force to the sleeve 149 in a direction close to the nut to push the sleeve 149 to cover the nut; after the joint piece 144 and the joint hole 32 are in joint fit, the sleeve 149 is close to the nut under the action of gravity and spring elasticity, if the sleeve 149 is not smoothly covered on the nut, then when the tightening mechanism 17 drives the bolt to rotate, compared with the case that the sleeve 149 is only under the action of gravity, the sleeve 149 can be smoothly covered on the nut because the sleeve 149 simultaneously bears the action of gravity and elasticity. It should be noted that the connecting member 143, the sleeve 149 and the nut are all located above the well-shaped frame 3, so that the direction of the elastic force applied to the sleeve 149 is substantially the same as the direction of the gravity applied to the sleeve 149.

Further, the sliding member 147 includes a first sliding portion 1471 and a second sliding portion 1472 connected to each other, the first sliding portion 1471 is provided with a positioning groove, a side wall of the sleeve 149 is provided with a waist-shaped hole, the sleeve 149 is sleeved on the periphery of the first sliding portion 1471, the sleeve 149 passes through the waist-shaped hole by a pin and is inserted into the positioning groove, so that the sleeve 149 is slidably fitted with the first sliding portion 1471; 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 assembly 14 further includes a second elastic member 152, one end of the second elastic member 152 is connected with the second sliding portion 1472, and the other end of the second elastic member 152 is connected with the mounting member 146. The through hole is arranged to be in sliding fit with the second sliding part 1472, and the second elastic piece 152 is additionally arranged to connect the second sliding part 1472 and the mounting piece 146, so that the second sliding part 1472 can slide relative to the mounting piece 146 and the connection relation with the mounting piece 146 is ensured; compared with the second sliding portion 1472 fixedly connected with 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, so that the movable range of the sleeve 149 is wider, and the sleeve 149 can be covered on the nut when the tightening mechanism 17 drives the nut to rotate through the driving bolt. It should be noted that the through hole is in clearance fit with the second sliding portion 1472, so that the second sliding portion 1472 can slide relative to the through hole and also have a certain swing allowance relative to the through hole, so that the sleeve 149 can be more flexibly sleeved on the nut, and poor installation caused by the sleeve 149 not being smoothly sleeved on the nut is avoided.

According to the utility model discloses an embodiment, the spout can be seted up to second sliding portion 1472, and the outer wall of sleeve 149 is provided with the screw hole, sleeve 149 pass the screw hole through the screw and stretch into in the spout with spout sliding fit to realize sleeve 149 and second sliding portion 1472's sliding fit.

As shown in fig. 5 and 6, the fixing base 161 includes a main body 1611, a fixing portion 1612 and two limiting portions 1613, the two limiting portions 1613 are both mounted on the shaft-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, an accommodating space 20 is defined by the two limiting portions 1613 and the main body 1611, and the accommodating space 20 is used for accommodating a positioning stud of the steering gear 4, so that the two limiting portions 1613 limit the rotation angle of the fixing portion 1612 relative to the shaft-shaped frame 3. The fixing groove 182 of the fixing portion 1612 is used for fixing a nut, the positioning stud of the steering gear 4 is located in the accommodating space 20, and the two limiting portions 1613 are respectively located on two sides of the positioning stud, so that when the tightening mechanism 17 drives the bolt to rotate, the fixing portion 1612 is limited by the limiting portions 1613 to rotate relative to the well-shaped frame 3, and therefore it is guaranteed that the nut cannot rotate relative to the bolt, and the bolt can be smoothly tightened under the driving of the tightening mechanism 17.

As shown in fig. 6, a magnetic member 21 is disposed on a bottom surface of the limiting portion 1613, and the magnetic member 21 is attached to the shaft 3. By additionally arranging the magnetic suction piece 21, the limiting part 1613 can be adsorbed on the well-shaped frame 3, the limiting part 1613 can be detachably connected with the well-shaped frame 3, and the fixing seat 161 can be more easily detached; meanwhile, the magnetic element 21 is attached to the shaft-shaped frame 3, so that the shaft-shaped frame 3 generates an attractive force to the limit portion 1613, static friction between the limit portion 1613 and the shaft-shaped frame 3 is enhanced, the limit portion 1613 is less prone to rotating relative to the shaft-shaped frame 3, and therefore it is guaranteed that the bolt and the nut can be smoothly screwed.

According to the utility model discloses an embodiment, the fixed subassembly 16 of second still includes handle piece 162, and handle piece 162 is connected with the cylinder for make things convenient for the staff to grip, so that the staff utilizes lever principle to remove through the fixed subassembly 16 of second that will adsorb on well-shaped frame 3 that handle piece 162 is comparatively light.

As shown in fig. 1, the positioning mechanism 12 includes a first positioning assembly 121, the first positioning assembly 121 includes a first elevation driving member 1211, a first positioning driving member 1212, and a positioning plate 1213 connected to an output shaft of the first positioning driving member 1212, the first elevation driving member 1211 is mounted on the mounting frame 11, the output shaft of the first elevation driving member 1211 is connected to the first positioning driving member 1212, and the first positioning driving member 1212 drives the positioning plate 1213 to move, so that the positioning plate 1213 is positioned on the well 3. When the well-shaped frame 3 is placed on the mounting frame 11, the first elevation driving member 1211 drives the first positioning driving member 1212 to descend, and the first positioning driving member 1212 contracts, so as to drive the positioning plate 1213 to coarsely position the well-shaped frame 3. It should be noted that the output shaft of the first lifting driving member 1211 is provided with a mounting plate 22, the first positioning driving member 1212 is mounted on the mounting plate 22, and the first positioning driving member 1212 drives the output shaft to contract, so that the positioning plate 1213 and the mounting plate 22 clamp the well-shaped frame 3, thereby realizing coarse positioning of the well-shaped frame 3.

As shown in fig. 1 and 7, the positioning mechanism 12 further includes a second positioning assembly 122, the second positioning assembly 122 includes a second lifting/lowering driving member 1221 and a positioning pin 1222 connected to an output shaft of the second lifting/lowering driving member 1221, and the second lifting/lowering driving member 1221 drives the positioning pin 1222 to move up and down, so that the positioning pin 1222 extends out of or into the positioning hole 31 of the well 3. The positioning pin 1222 is driven by the second lifting driving element 1221 to be inserted into the positioning hole 31, so that the first positioning assembly 121 is matched to further position the well-shaped frame 3, and the positioning precision of the well-shaped frame 3 is improved.

As shown in fig. 7, the second positioning assembly 122 further includes a limiting block 1223, the positioning pin 1222 is disposed through the limiting block 1223, and the size of the limiting block 1223 is larger than the size of the positioning hole 31, so as to limit the stroke of the positioning pin 1222. Through set up stopper 1223 in the periphery of locating pin 1222, because stopper 1223's size is greater than the size of locating hole 31, consequently stopper 1223 can not pass locating hole 31 but carries out the butt with well-shaped frame 3, limits locating pin 1222's descending stroke to because stopper 1223 and well-shaped frame 3 butt can also reduce well-shaped frame 3 and produce in the bolt tightening process and rock.

As shown in fig. 1 and 2, the tightening mechanism 17 includes a third elevation driving member 171 and tightening guns 172 mounted on an output shaft of the third elevation driving member 171, the number of the tightening guns 172 is at least two, and each of the at least two tightening guns 172 is provided corresponding to a nut. It should be noted that the number of the first fixing assemblies 14 and the second fixing assemblies 16 is at least one, and the plurality of bolts can be simultaneously tightened by providing at least two tightening guns 172, so that the bolt tightening efficiency is improved, and the installation efficiency of the steering gear 4 is further improved. The first elevation driving unit 1211, the second elevation driving unit 1221, and the third elevation driving unit 171 may be an air cylinder, an oil cylinder, or the like.

The above is only the preferred embodiment of the present invention, not limiting the scope of the present invention, all of which are under the concept of the present invention, the equivalent structure transformation of the content of the specification and the attached drawings is utilized, or the direct/indirect application is included in other related technical fields in the protection scope of the present invention.

Claims

1. A nut tightening device for tightening a nut that connects a well frame and a steering gear, comprising:

the mounting rack is used for placing the well-shaped rack;

the positioning mechanism is used for positioning the well-shaped frame;

the nut fixing mechanism comprises a first fixing component and a second fixing component, the first fixing component comprises a connecting frame and a sleeve mounted on the connecting frame, the connecting frame is detachably connected with the well-shaped frame, the sleeve is connected with the connecting frame in a sliding mode, and a fixing hole used for fixing the nut is formed in the sleeve; the second fixing component comprises a fixing seat, the fixing seat is installed on the well-shaped frame, and a fixing groove used for fixing the nut is formed in the fixing seat;

2. The nut tightening apparatus according to claim 1, wherein the link bracket includes a link member and a mounting member connected to each other, the mounting member includes a mounting member and a slider member mounted to the mounting member, the link member includes a link member and a snap member connected to each other, the mounting member is connected to the link member, the slider member is connected to the sleeve member, and the sleeve member slides relative to the slider member to hold or release the nut from being fixed to the fixing hole; the clamping piece is used for being matched with a clamping hole formed in the well-shaped frame in a clamping mode.

3. The nut tightening apparatus according to claim 2, wherein the first fixing member further includes a first elastic member having one end connected to the slider and the other end connected to the sleeve, the first elastic member being configured to drive the sleeve to move in a direction approaching the nut.

4. The nut tightening apparatus according to claim 3, wherein the slider includes a first slider portion and a second slider portion connected to each other, the first slider portion defines a positioning groove, a side wall of the sleeve defines a waist-shaped hole, the sleeve is fitted around a periphery of the first slider portion, and the sleeve is inserted into the positioning groove through the waist-shaped hole by a pin so that the sleeve is slidably engaged with the first slider portion; one end of the first elastic piece is connected with the first sliding part; the through-hole that supplies the second sliding part to pass is seted up to the installed part, first fixed subassembly still includes the second elastic component, the one end of second elastic component with the second sliding part is connected, the other end of second elastic component with the installed part is connected.

5. The nut tightening device according to any one of claims 1 to 4, wherein the fixing base includes a main body, a fixing portion, and two limiting portions, the two limiting portions are both mounted on the shaft frame, the fixing portion is connected to the main body, the fixing portion has the fixing groove, the two limiting portions are both connected to the main body, and the two limiting portions and the main body enclose an accommodating space for accommodating a positioning stud of the steering gear, so that the two limiting portions limit a rotation angle of the fixing portion with respect to the shaft frame.

6. The nut tightening device according to claim 5, wherein a magnetic member is provided on a bottom surface of the stopper portion, and the magnetic member is configured to attract the well-shaped frame.

7. The nut tightening device according to any one of claims 1 to 4, wherein the positioning mechanism includes a first positioning assembly, the first positioning assembly includes a first lifting driving member, a first positioning driving member, and a positioning plate connected to an output shaft of the first positioning driving member, the first lifting driving member is mounted to the mounting bracket, the output shaft of the first lifting driving member is connected to the first positioning driving member, and the first positioning driving member drives the positioning plate to move, so that the positioning plate positions the well frame.

8. The nut tightening apparatus according to claim 7, wherein the positioning mechanism further comprises a second positioning assembly including a second elevation driving member and a positioning pin connected to an output shaft of the second elevation driving member, the second elevation driving member driving the positioning pin to be elevated so that the positioning pin extends out of or into the positioning hole of the shaft frame.

9. The nut tightening device according to claim 8, wherein the second positioning assembly further includes a stopper, the positioning pin is inserted into the stopper, and the stopper is larger than the positioning hole in size to limit the stroke of the positioning pin.

10. The nut tightening apparatus according to claim 8, wherein the tightening mechanism includes a third elevation driving member and tightening guns mounted to output shafts of the third elevation driving member, the number of the tightening guns being at least two, at least two of the tightening guns each being provided for a respective one of the nuts.