Bumper and body sheet metal fixing bracket

Abstract

The present invention belongs to the technical field of vehicle accessory installation, and discloses a bumper and body sheet metal fixing bracket, including a bumper assembly, wherein the bumper assembly is fixed to the body sheet metal assembly by a fixing bracket assembly in a pressing and inner supporting manner. During the pressing and fixing process, the bumper assembly is locked to the body sheet metal assembly by a one-way limiting manner through the fixing bracket assembly, and simultaneously an alignment installation structure with automatic center alignment is formed between the bumper assembly and the body sheet metal assembly. During installation, when the top stand rotates clockwise relative to the middle stand during the pressing process, a plurality of installation support arms form a synchronously outwardly extending support structure on the middle stand, and through the cooperation of the ratchet and the pawl, the installation between the bumper assembly and the body sheet metal assembly forms a one-way limiting locking. During installation, there is no need to align the bumper assembly with the body sheet metal assembly, and during the pressing and installing process, the above structure will automatically adjust and align the installation position of the bumper assembly.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle accessory installation, and in particular relates to a bumper and body sheet metal fixing bracket. Background Art

[0002] The car bumper is a safety device that absorbs and mitigates external impact and protects the front and rear parts of the car body. With the development of the automobile industry, the car bumper, as an important safety device, has also been on the road of innovation. In addition to maintaining the original protection function, the front and rear bumpers of today's cars also pursue harmony and unity with the body shape and pursue their own lightweight.

[0003] The prior art has the following problems: when the bumper and the body sheet metal are fixedly installed, the bumper and the body sheet metal need to be aligned during the installation process. If they are not aligned, it is easy to cause misalignment or inconvenient installation, resulting in stress between the bumper and the body sheet metal, which is easy to cause later stress deformation. At the same time, when the bumper and the body sheet metal are installed, the position needs to be adjusted so that the installation position is aligned. This increases the difficulty of installation to a certain extent for workers, resulting in installation and disassembly being not quick and convenient, so this problem is urgently needed. Summary of the invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides a bumper and body sheet metal fixing bracket, which has the characteristic of being easy to fix and install.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a bumper and body sheet metal fixing bracket, comprising a bumper assembly, wherein the bumper assembly is fixed to the body sheet metal assembly by a pressing and internally supported fixing bracket assembly, and during the pressing and fixing process, the bumper assembly is locked to the body sheet metal assembly by a one-way limiting locking method of the fixing bracket assembly, and during the pressing and locking process, an alignment installation structure with automatic center alignment is formed between the bumper assembly and the body sheet metal assembly through the action of the fixing bracket assembly.

[0006] In a preferred embodiment of a bumper and a body sheet metal fixing bracket, the bumper assembly includes a bumper, and the inner wall of the bumper is fixedly provided with two opposite L-shaped longitudinal clamping arms and two opposite L-shaped transverse clamping arms;

[0007] The fixed bracket assembly includes a base frame, a middle frame and a top frame, the edge of the base frame is provided with two screw holes and a support seat arm tube, and a base positioning column is fixedly provided at the center of the base frame, a spiral guide rail slide groove is opened on the base positioning column, an arm tube side groove is opened on the support seat arm tube, and a push spring is sleeved on the outer side of the support seat arm tube, two supporting inner arms are symmetrically fixedly provided at the bottom of the middle frame, an inner arm support rod is fixedly provided at the bottom of the supporting inner arm, a second chassis and a first chassis are fixedly provided at the bottom edge of the middle frame, and a An electromagnet is arranged, a return spring is arranged on the second chassis, a pawl is rotatably arranged on the bottom edge of the middle platform, a strong magnet is fixedly arranged on the third chassis at one end of the pawl, four T-shaped seat grooves are opened on the top of the middle platform, a mounting support arm is slidably arranged inside the T-shaped seat groove, mounting blocks and mounting bosses are respectively fixedly arranged at both ends of the mounting support arm, an arc-shaped slide groove and a roller are arranged on the top surface of the top platform, and a ratchet and a guide rail seat cap are fixedly arranged at the bottom of the top platform through the chassis shaft rod, and a seat cap convex head is fixedly arranged on the inner wall of the guide rail seat cap;

[0008] The body sheet metal assembly comprises a body sheet metal, a mounting seat groove is opened in the middle of the body sheet metal, and a fixing threaded seat hole is arranged on the mounting seat groove.

[0009] In a preferred embodiment of a bumper and body sheet metal fixing bracket, the base frame shaft is rotatably connected to the middle frame via a bearing, the top frame is located above the middle frame, and the ratchet is located below the middle frame.

[0010] In a preferred solution of a bumper and body sheet metal fixing bracket, the mounting support arm slides on the middle platform through a T-shaped seat groove, and the mounting boss is inserted into the arc-shaped slide groove of the top platform. Through the reciprocating rotation of the top platform, the four mounting support arms perform synchronous extension and retraction actions in the middle platform.

[0011] In a preferred solution of a bumper and body sheet metal fixing bracket, the third chassis is arranged between the second chassis and the first chassis, and the two ends of the reset spring are respectively abutted between the second chassis and the third chassis, and through the tightening of the reset spring, a one-way limited locking rotation structure is formed between the front end of the pawl and the ratchet.

[0012] In a preferred embodiment of a bumper and body sheet metal fixing bracket, the inner support arm slides up and down in the support seat arm tube, the inner arm support rod slides up and down in the arm tube side groove, and the two ends of the push spring respectively abut against the middle frame and the base frame.

[0013] In a preferred embodiment of a bumper and body sheet metal fixing bracket, the guide rail seat cap is sleeved on the outside of the base positioning column, the seat cap boss is inserted into the spiral guide rail slide groove, and the base stand is fixed to the fixed threaded seat hole on the mounting seat groove by bolts and screw holes.

[0014] In a preferred solution of a bumper and body sheet metal fixing bracket, a pair of the mounting support arms on the longitudinal line are synchronously extended outward and drive two mounting block correction type inner supports to be fixed between two opposite L-shaped longitudinal arms, and a pair of the mounting support arms on the transverse line are synchronously extended outward and drive two mounting block correction type inner supports to be fixed between two opposite L-shaped transverse arms.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the bumper assembly is fixed to the body sheet metal assembly by pressing and internally supporting the fixing bracket assembly; during the pressing and fixing process, the bumper assembly is locked to the body sheet metal assembly by the fixing bracket assembly in a one-way limiting manner; and during the pressing and locking process, an alignment installation structure with automatic center alignment is formed between the bumper assembly and the body sheet metal assembly through the action of the fixing bracket assembly; during installation, when the top stand rotates clockwise relative to the middle stand during the pressing process, the arc-shaped slide groove pushes the multiple installation support arms outwards through the installation bosses, and the multiple installation support arms form a synchronously extended support structure on the middle stand; specifically, it is a supporting and fixing structure for the bumper assembly, that is, when the bumper When the assembly is pressed and approached to the body sheet metal assembly, the bumper assembly is fixedly installed on the body sheet metal assembly through the fixed bracket assembly through the follow-up and synchronously extended support structure. During the pressing process, the push spring is compressed, and the bottom frame shaft rod on the top frame is in a pressing and follow-up rotation on the middle frame. As the pressing continues, the top frame continues to rotate on the middle frame. When it rotates into place, the three mounting support arms form support for the bumper assembly after it is in place. In order to maintain this support, the present invention is provided with a ratchet on the bottom frame shaft rod, and a pawl is provided at the bottom of the middle frame. Through the cooperation of the ratchet and the pawl, the unidirectional clockwise rotation of the top frame on the middle frame is realized, that is, when it is pressed into place, that is, when the bumper assembly is close to the vehicle After the body sheet metal component is in place, the follow-up inner support structure can be used to realize the press-type fixed installation of the bumper component on the body sheet metal component, and with the setting of the above-mentioned one-way limiting structure, the installation between the bumper component and the body sheet metal component forms a one-way limiting locking, that is, when the bumper component is actually installed, it is only necessary to press the inner wall of the bumper component against the top stand and then continue to press. When pressed into place, the follow-up inner support structure and the one-way limiting locking structure can be used to realize the firm installation of the bumper component on the body sheet metal component. When installing and fixing, a pair of installation support arms on the longitudinal line are synchronously extended outward and drive the two installation card blocks to be fixed between the two opposite L-shaped longitudinal card arms, and a pair of installation support arms on the horizontal line The two mounting card blocks are synchronously extended outward and driven to fix the correction-type inner support between the two opposite L-shaped horizontal clamp arms, that is, in the longitudinal and transverse directions. Through the above-mentioned synchronous centering correction in the longitudinal and transverse directions, the mounting position of the bumper assembly can be automatically corrected with the mounting position of the body sheet metal assembly when the bumper assembly is pressed and installed. Through this mounting structure, when the bumper assembly is actually pressed and installed, it is not necessary to align the bumper assembly with the body sheet metal assembly tightly, because during the press installation, the automatic correction of the bumper assembly mounting position can be achieved through the above-mentioned structure, which greatly reduces the installation difficulty between the bumper assembly and the body sheet metal assembly. In short, during installation, it is not necessary to align the bumper assembly with the body sheet metal assembly. During the press installation process,The above structure will adjust and align the installation position of the bumper assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional diagram of the present invention when in use;

[0017] Figure 2 An exploded view of the present invention when used;

[0018] Figure 3 A three-dimensional diagram of the fixing bracket assembly of the present invention installed on a body sheet metal assembly;

[0019] Figure 4 is a three-dimensional diagram of a fixing bracket assembly of the present invention;

[0020] Figure 5 An exploded view of the fixing bracket assembly of the present invention;

[0021] Figure 6 A three-dimensional diagram of the top stand of the present invention;

[0022] Figure 7 It is an exploded view of the middle stand of the present invention;

[0023] Figure 8 It is a schematic diagram of the structure of the ratchet and the pawl of the present invention;

[0024] Fig. 9 is a three-dimensional diagram of a bumper assembly of the present invention;

[0025] Fig.10 A three-dimensional diagram of a vehicle body sheet metal component of the present invention;

[0026] In the figure: 100, bumper assembly; 101, bumper; 102, L-shaped longitudinal clamp arm; 103, L-shaped transverse clamp arm; 200, fixed bracket assembly; 201, base frame; 202, middle frame; 203, top frame; 204, base positioning column; 205, spiral guide rail slide groove; 206, screw hole; 207, support seat arm tube; 208, arm tube side groove; 209, push spring; 210, support inner arm; 211, inner arm support rod; 212, installation block; 213, installation support Support arm; 214, mounting boss; 215, chassis shaft; 216, ratchet; 217, guide rail seat cap; 218, roller; 219, arc-shaped slide groove; 220, seat cap boss; 221, T-shaped seat groove; 222, first chassis; 223, electromagnet; 224, second chassis; 225, return spring; 226, pawl; 227, third chassis; 228, strong magnet; 300, body sheet metal component; 301, body sheet metal; 302, mounting seat groove; 303, fixing threaded seat hole. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0028] See also Figure 1-Figure 10 As shown, the present invention provides a bumper and body sheet metal fixing bracket, including a bumper assembly 100, the bumper assembly 100 is fixed to the body sheet metal assembly 300 by a fixing bracket assembly 200 in a press-type and internally supported manner, during the press-fixing process, the bumper assembly 100 is locked to the body sheet metal assembly 300 in a one-way limiting manner by the fixing bracket assembly 200, and during the press-locking and fixing process, through the action of the fixing bracket assembly 200, an alignment installation structure with automatic center alignment is formed between the bumper assembly 100 and the body sheet metal assembly 300.

[0029] In a preferred embodiment, please refer to Fig. 9 The bumper assembly 100 includes a bumper 101 , and the inner wall of the bumper 101 is fixedly provided with two opposite L-shaped longitudinal clamping arms 102 and two opposite L-shaped transverse clamping arms 103 .

[0030] In a preferred embodiment, please refer to Figure 4-Figure 8The fixed support assembly 200 includes a base frame 201, a middle frame 202 and a top frame 203. Two screw holes 206 and a support seat arm tube 207 are arranged on the edge of the base frame 201, and a base positioning column 204 is fixedly arranged at the center of the base frame 201. A spiral guide rail slide groove 205 is opened on the base positioning column 204, and an arm tube side groove 208 is opened on the support seat arm tube 207. The support seat arm tube 207 is provided with an arm tube side groove 208, and a push spring 209 is sleeved on the outer side of the support seat arm tube 207. Two supporting inner arms 210 are symmetrically fixedly arranged at the bottom of the middle frame 202, and an inner arm support rod 211 is fixedly arranged at the bottom of the supporting inner arm 210. A second chassis 224 and a first chassis 222 are fixedly arranged at the bottom edge of the middle frame 202, and an electromagnetic The middle platform 202 is provided with a pawl 226 at the bottom edge of the middle platform 202, and a strong magnet 228 is fixedly provided on the third platform 227 at one end of the pawl 226. The top of the middle platform 202 is provided with four T-shaped seat grooves 221, and a mounting support arm 213 is slidably provided inside the T-shaped seat groove 221. The two ends of the mounting support arm 213 are respectively fixed with mounting blocks 212 and mounting bosses 214. The top surface of the top platform 203 is provided with an arc-shaped slide groove 219 and a roller 218, and the bottom of the top platform 203 is fixedly provided with a ratchet 216 and a guide seat cap 217 through the bottom frame shaft rod 215. The inner wall of the guide seat cap 217 is fixedly provided with a seat cap convex head 220, and the bottom frame shaft rod 2 15 is rotatably connected with the middle platform 202 through a bearing, the top platform 203 is located above the middle platform 202, the ratchet 216 is located below the middle platform 202, the mounting support arm 213 slides on the middle platform 202 through the T-shaped seat groove 221, and the mounting boss 214 is inserted into the arc-shaped slide groove 219 of the top platform 203. Through the reciprocating rotation of the top platform 203, the four mounting support arms 213 perform synchronous extension and synchronous retraction in the middle platform 202. The third chassis 227 is arranged between the second chassis 224 and the first chassis 222, and the two ends of the reset spring 225 are respectively in contact between the second chassis 224 and the third chassis 227. Through the tightening of the reset spring 225, the front end of the ratchet 226 is in contact with the ratchet 2 16 forms a one-way limit locking rotation structure, the support inner arm 210 slides up and down in the support seat arm tube 207, the inner arm support rod 211 slides up and down in the arm tube side groove 208, the two ends of the push spring 209 respectively abut against the middle stand 202 and the base stand 201, the guide rail seat cap 217 is sleeved on the outside of the base positioning column 204, the seat cap boss 220 is inserted in the spiral guide rail slide groove 205, a pair of mounting support arms 213 on the longitudinal line synchronously extend outward and drive the two mounting blocks 212 to fix the correction type inner support between the two opposite L-shaped longitudinal arms 102, and a pair of mounting support arms 213 on the transverse line synchronously extend outward and drive the two mounting blocks 212 to fix the correction type inner support between the two opposite L-shaped transverse arms 103.

[0031] In a preferred embodiment, please refer to Fig.10 The body sheet metal assembly 300 includes a body sheet metal 301, a mounting seat groove 302 is opened in the middle of the body sheet metal 301, a fixed threaded seat hole 303 is set on the mounting seat groove 302, and the base frame 201 is fixed to the fixed threaded seat hole 303 on the mounting seat groove 302 by bolts and screw holes 206.

[0032] In summary, during installation, first install the fixing bracket assembly 200 at the fixing threaded seat hole 303 of the body sheet metal assembly 300 through the bolts and screw holes 206, then pick up the bumper assembly 100, so that the inner wall of the bumper assembly 100 contacts the roller 218 of the top stand 203, and press the top stand 203. When the top stand 203 is forced to move backward (moving backward means moving toward the base stand 201), the middle stand 202 also moves toward the base stand 201 synchronously. During this process, since the guide rail seat cap 217 is sleeved on the outside of the base positioning column 204, and the seat cap boss 220 is inserted into the spiral guide rail slide groove 205, and the bottom frame shaft rod 215 is rotatably set on the middle stand 202, when the guide rail seat cap 217 slides toward the root of the base positioning column 204 During movement, the seat cap boss 220 spirally slides in the spiral guide rail slot 205, and the base frame shaft rod 215 forms a clockwise rotating structure on the middle platform 202. When the top platform 203 rotates clockwise relative to the middle platform 202 during the pressing process, the arc-shaped slot 219 pushes the multiple mounting support arms 213 outward through the mounting boss 214. At this time, the multiple mounting support arms 213 form a synchronously extended support structure on the middle platform 202, specifically, it is a supporting and fixing structure for the bumper assembly 100, that is, when the bumper assembly 100 is pressed close to the body sheet metal assembly 300, the bumper assembly 100 is fixedly installed on the body sheet metal assembly 300 through the fixed bracket assembly 200 through this follow-up and synchronously extended support structure.

[0033] On the basis of the above, that is, during the pressing process, the top stand 203 and the middle stand 202 move toward the base stand 201. During the pressing process, the push spring 209 is compressed. At this time, the bottom frame shaft 215 on the top stand 203 is in a pressing follow-up rotation on the middle stand 202. As the pressing continues, the top stand 203 continues to rotate on the middle stand 202. When it rotates into place, the three mounting support arms 213 form a support for the bumper assembly 100 in place. In order to maintain this support, the present invention is provided with a ratchet 216 on the bottom frame shaft 215, and a pawl 226 is provided at the bottom of the middle stand 202. Through the cooperation of the ratchet 216 and the pawl 226, the top stand 203 is realized on the middle stand The one-way clockwise rotation on the frame 202, that is, when it is pressed into place, that is, when the bumper assembly 100 is close to the body sheet metal assembly 300 and is in place, the follow-up inner support structure can be used to realize the press-type fixed installation of the bumper assembly 100 on the body sheet metal assembly 300, and with the setting of the above-mentioned one-way limiting structure, the installation between the bumper assembly 100 and the body sheet metal assembly 300 forms a one-way limiting locking, that is, when the bumper assembly 100 is actually installed, it is only necessary to press the inner wall of the bumper assembly 100 against the top stand 203, and then continue to press. When it is pressed into place, the follow-up inner support structure and the one-way limiting locking structure can be used to realize the firm installation of the bumper assembly 100 on the body sheet metal assembly 300.

[0034] On the basis of the above, the bumper assembly 100 of the present invention is installed on the body sheet metal assembly 300 through the internal support of the fixed bracket assembly 200. The synchronous internal support refers to the synchronous internal support in the horizontal and vertical directions, that is, when the top stand 203 rotates relative to the middle stand 202, the clockwise rotation of the top stand 203 at this time will drive a pair of mounting support arms 213 on the longitudinal line to synchronously extend outward and drive two mounting clamps 212. The correction type internal support is fixed between two opposite L-shaped longitudinal clamps 102, and a pair of mounting support arms 213 on the transverse line to synchronously extend outward and drive two mounting clamps 212. The correction type internal support is fixed between two opposite L-shaped transverse clamps 103, that is, in the longitudinal and transverse directions, through the above-mentioned longitudinal and transverse synchronous centering correction , so that when the bumper assembly 100 is pressed and installed, the installation position of the bumper assembly 100 can be automatically corrected with the installation position of the body sheet metal assembly 300. Through this installation structure, when the bumper assembly 100 is actually pressed and installed, it is not necessary to align the bumper assembly 100 with the body sheet metal assembly 300 tightly, because during the press installation, the automatic correction of the installation position of the bumper assembly 100 can be achieved through the above structure, which greatly reduces the installation difficulty between the bumper assembly 100 and the body sheet metal assembly 300. In short, during installation, it is not necessary to align the bumper assembly 100 with the body sheet metal assembly 300. During the press installation process, the above structure will adjust and align the installation position of the bumper assembly 100.

[0035] On the basis of the above, when disassembling the bumper assembly 100, it is only necessary to energize the electromagnet 223. The strong magnetism generated by the electromagnet 223 will exert a pressing pressure on the pawl 226 through the strong magnet 228. At this time, the front end of the pawl 226 and the ratchet 216 will be separated from the one-way limit. At this time, through the action of the push spring 209, the push spring 209 will immediately reset and push the middle stand 202 and the top stand 203 outward. In the process of pushing, the bumper assembly 100 and the body sheet metal assembly 300 are separated. During this process, through the cooperation of the spiral guide rail slide groove 205 and the seat cap boss 220, the top platform 203 rotates counterclockwise on the middle platform 202. At this time, multiple mounting support arms 213 form a synchronously retracted support and fixing structure on the middle platform 202, that is, in the process of pushing the bumper assembly 100 out of the body sheet metal assembly 300, the internal support fixation of the bumper assembly 100 is released. In this way, rapid disassembly between the bumper assembly 100 and the body sheet metal assembly 300 can be achieved.

[0036] In another embodiment of the present invention, corresponding latches or matching slots may be provided on the bumper assembly 100 and the body sheet metal assembly 300. When the bumper assembly 100 and the body sheet metal assembly 300 are pressed and aligned close to their positions, the latches are inserted into the slots, thereby further ensuring the stability of the bumper assembly 100 and the body sheet metal assembly 300 during installation.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bumper and body sheet metal fixing bracket, comprising a bumper assembly (100), characterized in that: The bumper assembly (100) is fixed to the body sheet metal assembly (300) by pressing and internally supporting the fixing bracket assembly (200); during the pressing and fixing process, the bumper assembly (100) is locked to the body sheet metal assembly (300) by the fixing bracket assembly (200) in a one-way limiting manner; and during the pressing and locking process, an alignment installation structure with automatic center alignment is formed between the bumper assembly (100) and the body sheet metal assembly (300) by the action of the fixing bracket assembly (200); The bumper assembly (100) comprises a bumper (101), wherein two opposite L-shaped longitudinal clamping arms (102) and two opposite L-shaped transverse clamping arms (103) are fixedly arranged on the inner wall of the bumper (101); The fixed support assembly (200) comprises a base frame (201), a middle frame (202) and a top frame (203); two screw holes (206) and a support seat arm tube (207) are arranged at the edge of the base frame (201); a base positioning column (204) is fixedly arranged at the center of the base frame (201); a spiral guide rail slide groove (205) is provided on the base positioning column (204); an arm tube side groove (208) is provided on the support seat arm tube (207); and a push spring (209) is sleeved on the outside of the support seat arm tube (207); two support inner arms (210) are symmetrically fixedly arranged at the bottom of the middle frame (202); an inner arm support rod (211) is fixedly arranged at the bottom of the support inner arm (210); a second chassis (224) and a first chassis (222) are fixedly arranged at the bottom edge of the middle frame (202); an electric The second chassis (224) is provided with a return spring (225), the bottom edge of the middle platform (202) is rotatably provided with a pawl (226), a strong magnet (228) is fixedly provided on the third chassis (227) at one end of the pawl (226), the top of the middle platform (202) is provided with four T-shaped seat grooves (221), and a mounting support arm (213) is slidably provided inside the T-shaped seat groove (221). ), the two ends of the mounting support arm (213) are respectively fixedly provided with mounting blocks (212) and mounting bosses (214), the top surface of the top stand (203) is provided with an arc-shaped slide groove (219) and a roller (218), and the bottom of the top stand (203) is fixedly provided with a ratchet (216) and a guide rail seat cap (217) through a bottom frame shaft (215), and the inner wall of the guide rail seat cap (217) is fixedly provided with a seat cap boss (220); The body sheet metal assembly (300) comprises a body sheet metal (301), a mounting seat groove (302) is provided in the middle of the body sheet metal (301), and a fixing threaded seat hole (303) is provided on the mounting seat groove (302); The bottom frame shaft (215) is rotatably connected to the middle frame (202) via a bearing, the top frame (203) is located above the middle frame (202), and the ratchet (216) is located below the middle frame (202); The mounting support arms (213) slide on the middle platform (202) through the T-shaped seat grooves (221), and the mounting bosses (214) are inserted into the arc-shaped slide grooves (219) of the top platform (203). Through the reciprocating rotation of the top platform (203), the four mounting support arms (213) perform synchronous extension and synchronous retraction actions in the middle platform (202).

2. A bumper and body sheet metal fixing bracket according to claim 1, characterized in that: The third chassis (227) is arranged between the second chassis (224) and the first chassis (222), and two ends of the return spring (225) respectively abut between the second chassis (224) and the third chassis (227), and through the tightening of the return spring (225), a one-way limit locking rotation structure is formed between the front end of the pawl (226) and the ratchet wheel (216).

3. A bumper and body sheet metal fixing bracket according to claim 1, characterized in that: The supporting inner arm (210) slides up and down in the supporting seat arm tube (207), the inner arm support rod (211) slides up and down in the arm tube side groove (208), and the two ends of the push spring (209) respectively contact the middle platform (202) and the base platform (201).

4. A bumper and body sheet metal fixing bracket according to claim 1, characterized in that: The guide rail seat cap (217) is sleeved on the outside of the base positioning column (204), the seat cap boss (220) is inserted into the spiral guide rail slide groove (205), and the base stand (201) is fixed to the fixed threaded seat hole (303) on the installation seat groove (302) through bolts and screw holes (206).

5. The bumper and body sheet metal fixing bracket according to claim 1, characterized in that: The pair of mounting support arms (213) on the longitudinal line are synchronously extended outward and drive the two mounting clamps (212) to be fixed between the two opposite L-shaped longitudinal clamps (102) with a correction type inner support, and the pair of mounting support arms (213) on the transverse line are synchronously extended outward and drive the two mounting clamps (212) to be fixed between the two opposite L-shaped transverse clamps (103) with a correction type inner support.

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