A commercial vehicle bumper assembly tool

Abstract

The utility model provides a kind of commercial vehicle bumper assembly tool, belong to the technical field of automobile parts assembly, including platform main body, the middle part of platform main body is provided with the positioning mechanism of being able to lift, two positioning mechanisms are symmetrically arranged along the length direction of platform main body;The both ends of platform main body upside are respectively provided with the upper support portion of being able to lift, and the both ends of platform main body downside are respectively provided with lower support portion, two upper support portions and two lower support portions are symmetrically arranged along the length direction of platform main body;Two upper support portions can support the upper portion of bumper, and two lower support portions can support the lower portion of bumper.The utility model can accurately position to prevent assembly misplacement, adapt to multiple vehicle types to reduce cost, paint surface is easy to maintain, can improve assembly quality and efficiency, satisfy commercial vehicle bumper assembly demand.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts assembly technology, and in particular to a tooling for assembling a commercial vehicle bumper. Background Technology

[0002] In the field of automotive manufacturing equipment, bumper assembly fixtures are core equipment for ensuring assembly accuracy and production efficiency. Especially in commercial vehicle manufacturing scenarios, commercial vehicle bumpers often adopt a combination assembly structure of "engineering plastic panels + metal frames". They are large in size, bow-shaped, and the installation points are scattered on different planes. At the same time, the panels are painted parts and need to be protected from scratches. This places higher demands on the positioning accuracy, adaptability, protection, and cost control of the fixtures.

[0003] In the prior art, Chinese patent CN206140364U discloses a bumper assembly fixture, including a base plate and side plates inclined on both sides of the base plate. Multiple positioning seats are provided on both the base plate and the side plates, each positioning seat including an adjustment device and a profile block mounted on the upper end of the adjustment device. The adjustment device includes a height adjustment mechanism and a direction adjustment mechanism. The direction adjustment mechanism adjusts the direction of the profile block through a spherical connector on the base, while the height adjustment mechanism achieves height fixation through rack and pinion lifting, spring assistance, and locking by the positioning device. This type of fixture, by bidirectionally adjusting the position of the profile block, achieves a certain degree of fit and support for different bumpers, reducing the number of dedicated tooling components.

[0004] However, the existing tooling has the following shortcomings in meeting the specific assembly requirements of commercial vehicle bumpers: First, its positioning adaptability is insufficient. While the tooling achieves adjustment through rack and pinion lifting and ball joint steering, its adjustment logic is not designed for the dual-layer assembly characteristics of the "panel + frame" of commercial vehicle bumpers. This fails to eliminate positioning deviations during engagement, easily leading to misalignment or obstruction between the frame mounting holes and the pre-embedded nuts on the panel, resulting in fastener delamination and damage. Simultaneously, the panel's rigidity is weaker than the frame, and without precise support, it is prone to deformation under gravity, creating gaps. During bolt tightening, this can cause panel twisting or even cracking at the nut seat root, severely impacting assembly quality. Second, its expandability and cost control are insufficient. Although the support and positioning components of the tooling can be partially adjusted in height, the base plate lacks an expansion hole system. The overall layout cannot be adjusted according to the production needs of multiple vehicle models, making secondary modifications difficult. This necessitates that companies still equip new models with dedicated tooling, resulting in high equipment investment and site occupancy costs. Third, the tooling lacks limiting and protective functions. On the one hand, the tooling only relies on the surface support of the positioning seat and does not have a limiting structure designed for commercial vehicle bumpers. During assembly, the bumper is prone to shifting, which further reduces the assembly accuracy. On the other hand, the surface blocks of the tooling do not use protective materials. When the painted surface of the commercial vehicle bumper panel comes into contact with the tooling, it is easily scratched by foreign objects on the tooling surface, causing appearance defects.

[0005] Therefore, existing tooling cannot meet the comprehensive requirements of commercial vehicle bumpers for "high-precision assembly, multi-model adaptation, paint protection, and cost control." There is an urgent need for a special assembly tooling for commercial vehicle scenarios to solve the above-mentioned technical defects, improve assembly quality and production efficiency, avoid paint scratches, and reduce equipment and site costs. Utility Model Content

[0006] The purpose of this utility model is to overcome the shortcomings of existing tooling in terms of positioning adaptability and low assembly accuracy, and to provide a tooling for assembling commercial vehicle bumpers.

[0007] This utility model is achieved through the following technical solution: a commercial vehicle bumper assembly fixture, comprising a platform body, wherein a lifting positioning mechanism is provided in the middle of the platform body, two positioning mechanisms are symmetrically arranged along the length direction of the platform body, and the top of the positioning mechanism can be inserted into a hole on the bumper to position the bumper; lifting upper support parts are respectively provided at both ends of the upper side of the platform body, and lower support parts are respectively provided at both ends of the lower side of the platform body, the two upper support parts and the two lower support parts are symmetrically arranged along the length direction of the platform body; the line connecting the two upper support parts and the two lower support parts can form an inverted isosceles trapezoid, and the two upper support parts can support the upper part of the bumper, and the two lower support parts can support the lower part of the bumper.

[0008] This tooling effectively avoids the assembly misalignment problem caused by positioning deviation in existing technologies through hole insertion positioning, ensuring the accuracy of fastener installation and reducing the risk of damage from loose threads; the inverted isosceles trapezoidal support structure can evenly distribute the force on the bumper, preventing the panel from twisting and deforming due to excessive local stress; the height-adjustable design allows the tooling to be adapted to commercial vehicle bumpers of different sizes, improving versatility, reducing the number of special toolings, and lowering equipment investment and site occupation costs.

[0009] A further improvement of this utility model is that the positioning mechanism includes a corner seat and a pin seat. The pin seat is disposed on the top of the corner seat, and the bottom of the corner seat is connected to the platform body. A pin that can be inserted and removed is inserted into the pin seat. The top of the pin is connected to a pin head located above the pin seat. The pin head can be inserted into a hole on the bumper. A limiting protrusion is provided on the side wall of the pin near the bottom of the pin head. The insertion port at the top of the pin seat is provided with a long opening groove and a short opening groove that cooperate with the limiting protrusion. The limiting protrusion can be inserted into the long opening groove or the short opening groove.

[0010] A further improvement of this utility model is that the corner seat is provided with a cavity, and the bottom of the pin extends into the cavity after passing through the bottom of the pin seat; the pin is a stud structure, and the cavity is a semi-closed structure with one side open, through which a nut is screwed to the bottom of the pin.

[0011] A further improvement of this utility model is that a return spring is sleeved on the pin shaft between the nut and the top of the chamber, with the two ends of the return spring abutting against the top of the nut and the top of the chamber, respectively.

[0012] A further improvement of this utility model is that the top of the corner bracket is provided with an interface, and the bottom of the pin bracket is connected with a connector corresponding to the interface, and the corner bracket and the pin bracket are detachably connected through the interface and the connector.

[0013] A further improvement of this utility model is that the upper support part includes a column and a sleeve, the sleeve is slidably sleeved on the column, and the bottom of the column is connected to the platform body; a limiting contour block is provided at the top of the sleeve, and a limiting contour opening is provided on the side of the limiting contour block near the positioning mechanism; a limiting post is provided on the side wall of the column, and a long sliding groove and a short sliding groove are provided on the side wall of the sleeve to cooperate with the limiting post. The short sliding groove is located on one side of the bottom of the long sliding groove, and the bottom of the short sliding groove is connected to the bottom of the long sliding groove. The limiting post can be slidably disposed inside the long sliding groove or the short sliding groove.

[0014] A further improvement of this utility model is that the limiting contour block is made of polyurethane rubber.

[0015] A further improvement of this utility model is that the lower support part includes a support column and a limiting block. The limiting block is fixed to the top of the support column, the bottom of the support column is connected to the platform body, and the top of the limiting block is provided with a U-shaped limiting groove.

[0016] A further improvement of this utility model is that the platform body includes a BASE plate and a base, the top of the BASE plate is used to install a positioning mechanism, an upper support part and a lower support part, and the base is fixed to the bottom of the BASE plate.

[0017] A further improvement of this utility model is that the BASE plate is provided with an equidistant hole system A for connecting the positioning mechanism, an equidistant hole system B for connecting the upper support, and an equidistant hole system C for connecting the lower support; the equidistant hole system A is arranged along the width direction of the platform body, and the equidistant hole system B and the equidistant hole system C are both arranged along the length direction of the platform body.

[0018] As can be seen from the above technical solutions, the beneficial effects of this utility model are: 1. This tooling can precisely improve assembly quality. Targeting the "panel + frame" structure of commercial vehicle bumpers, it avoids fastener delamination caused by misalignment through hole insertion positioning and bump-groove height adjustment. The inverted isosceles trapezoidal support layout adapts to the bow shape of the bumper, evenly distributing gravity, preventing panel twisting and cracking, and ensuring assembly accuracy and appearance integrity.

[0019] 2. This tooling has good versatility and economy. The modular and detachable pin seat and the sliding height adjustment can be quickly adapted to two vehicle models, reducing the number of special tooling. The multi-directional equidistant hole system of the BASE plate supports later expansion and modification, eliminating the need to scrap tooling due to vehicle model updates. At the same time, it simplifies adjustment operations, shortens the preparation time for vehicle model switching, and improves production efficiency.

[0020] 3. This tooling combines protection and practicality. The polyurethane rubber contour blocks prevent scratches on the paint surface, the return spring eliminates positioning gaps and prevents loosening, and the semi-enclosed chamber and modular structure facilitate maintenance and replacement of parts, extend the tooling's lifespan, reduce long-term usage costs, and provide enterprises with an efficient and reliable assembly solution. Attached Figure Description

[0021] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a structural schematic diagram of a specific embodiment of the present utility model.

[0023] Figure 2 This is a schematic diagram of the structure of the platform body in a specific embodiment of this utility model.

[0024] Figure 3 This is a schematic diagram of the positioning mechanism according to a specific embodiment of the present invention.

[0025] Figure 4 This is an exploded view of the positioning mechanism according to a specific embodiment of the present invention.

[0026] Figure 5 This is a schematic diagram of the upper support portion according to a specific embodiment of the present invention.

[0027] Figure 6 yes Figure 5 A magnified view of part A in the middle.

[0028] Figure 7 This is a schematic diagram of the lower support portion according to a specific embodiment of the present invention.

[0029] In the diagram: 1. Platform body; 101. BASE plate; 1011. Equidistant hole system A; 1012. Equidistant hole system B; 1013. Equidistant hole system C; 102. Base; 2. Positioning mechanism; 201. Angle seat; 2011. Chamber; 2012. Interface; 202. Pin seat; 2021. Long opening slot; 2022. Short opening slot; 2023. Connector; 203. Pin; 204. Pin head; 205. Limiting protrusion; 206. Nut; 207. Return spring; 3. Upper support part; 301. Column; 302. Sleeve; 3021. Long slide groove; 3022. Short slide groove; 303. Limiting contour block; 3031. Limiting contour opening; 304. Limiting post; 4. Lower support part; 401. Support post; 402. Limiting block; 4021. U-shaped limiting groove. Detailed Implementation

[0030] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0031] Now refer to Figures 1-6 The following is a description of a specific embodiment of the present invention: A car bumper assembly fixture includes a platform body 1. A lifting positioning mechanism 2 is provided in the middle of the platform body 1. Two positioning mechanisms 2 are symmetrically arranged along the length of the platform body 1, and the top of each positioning mechanism 2 can be inserted into a hole on the bumper to position the bumper. Liftable upper support parts 3 are provided at both ends of the upper side of the platform body 1, and lower support parts 4 are provided at both ends of the lower side of the platform body 1. Both upper support parts 3 and lower support parts 4 are symmetrically arranged along the length of the platform body 1. The line connecting the two upper support parts 3 and the two lower support parts 4 can form an inverted isosceles trapezoid, and the two upper support parts 3 can support the upper part of the bumper, while the two lower support parts 4 can support the lower part of the bumper.

[0032] The platform body 1 serves as the basic load-bearing structure for the entire tooling, providing an installation benchmark for each functional component. Two liftable positioning mechanisms 2, symmetrically arranged along the length of the middle section, achieve precise positioning by inserting into the bumper holes at the top. Their lifting function can be flexibly adjusted according to the height of the holes on different vehicle models, ensuring a consistent positioning benchmark. The liftable upper support parts 3 at both ends of the upper side of the platform body 1 and the lower support parts 4 at both ends of the lower side are also symmetrically arranged along the length of the platform body 1, and the line connecting the two forms an inverted isosceles trapezoidal structure. This structure is highly compatible with the bow-shaped shape of the commercial vehicle bumper. The upper support parts 3 support the upper part of the bumper by adjusting their height, while the lower support parts 4 stably support the lower part of the bumper, jointly distributing the weight of the bumper.

[0033] This tooling effectively avoids the assembly misalignment problem caused by positioning deviation in existing technologies through hole insertion positioning, ensuring the accuracy of fastener installation and reducing the risk of damage from loose threads; the inverted isosceles trapezoidal support structure can evenly distribute the force on the bumper, preventing the panel from twisting and deforming due to excessive local stress; the height-adjustable design allows the tooling to be adapted to commercial vehicle bumpers of different sizes, improving versatility, reducing the number of special toolings, and lowering equipment investment and site occupation costs.

[0034] Specifically, refer to Figure 3 and Figure 4 The positioning mechanism 2 includes a corner seat 201 and a pin seat 202. The pin seat 202 is disposed on the top of the corner seat 201, and the bottom of the corner seat 201 is connected to the platform body 1. A pin 203 that can be inserted and removed is inserted into the pin seat 202. The top of the pin 203 is connected to a pin head 204 located above the pin seat 202. The pin head 204 can be inserted into a hole on the bumper. A limiting protrusion 205 is provided on the side wall of the pin 203 near the bottom of the pin head 204. The insertion port at the top of the pin seat 202 is provided with a long opening groove 2021 and a short opening groove 2022 that cooperate with the limiting protrusion 205, and the limiting protrusion 205 can be inserted into the long opening groove 2021 or the short opening groove 2022.

[0035] The positioning mechanism 2 is fixedly connected to the platform body 1 via the corner bracket 201. The pin seat 202 is installed on the top of the corner bracket 201, forming a stable positioning bracket. In use, the pin 203 is pulled out so that the pin head 204 is aligned with the bumper hole and inserted. Then, the pin 203 is rotated so that the limiting protrusion 205 on the side wall of the pin 203 is engaged with the long opening groove 2021 or the short opening groove 2022 at the insertion port of the pin seat 202. The height of the pin head 204 is adjusted by utilizing the depth difference between the two grooves, thereby adapting to the hole depth requirements of bumpers of different thicknesses.

[0036] Compared to the existing rack and pinion adjustment structure, this tooling uses a mechanical snap-fit ​​height adjustment, which is simpler and faster to operate. The tight fit between the limiting protrusion 205 and the groove body can prevent loosening after adjustment and improve positioning stability. The two groove depth designs can quickly switch the positioning height to meet the positioning requirements of two mainstream commercial vehicle models without complicated debugging, thus improving assembly efficiency.

[0037] Specifically, refer to Figure 5 and Figure 6 The upper support 3 includes a column 301 and a sleeve 302. The sleeve 302 is slidably fitted onto the column 301, and the bottom of the column 301 is connected to the platform body 1. A limiting contour block 303 is provided at the top of the sleeve 302, and a limiting contour opening 3031 is provided on the side of the limiting contour block 303 near the positioning mechanism 2. A limiting post 304 is provided on the side wall of the column 301, and a long sliding groove 3021 and a short sliding groove 3022 that cooperate with the limiting post 304 are provided on the side wall of the sleeve 302. The short sliding groove 3022 is located on one side of the bottom of the long sliding groove 3021, and the bottom of the short sliding groove 3022 is connected to the bottom of the long sliding groove 3021. The limiting post 304 can be slidably disposed inside the long sliding groove 3021 or the short sliding groove 3022.

[0038] The column 301 of the upper support part 3 is fixed to the platform body 1, and the sleeve 302 can slide along the column 301 to achieve height adjustment. During adjustment, lift the sleeve 302 upward to make the limiting column 304 slide along the long slide groove 3021 to the required height. If it is necessary to fix the low position, rotate the sleeve 302 to make the limiting column 304 slide into the short slide groove 3022 that is connected to the bottom of the long slide groove 3021, so as to achieve height locking. The limiting contour block 303 at the top of the sleeve 302 fits the upper curved surface of the bumper through the limiting contour opening 3031 to form a stable support.

[0039] The aforementioned sliding adjustment structure is simple to operate and provides more stable support compared to the existing spherical connector, avoiding support failure caused by lateral offset. The combination of long and short sliding tracks enables rapid height switching and locking, adapting to the upper support requirements of bumpers in two different vehicle models. The fitting design of the limiting contour opening 3031 with the curved surface of the bumper increases the support contact area, reduces local pressure, and prevents damage to the panel.

[0040] Specifically, refer to Figure 7 The lower support part 4 includes a support column 401 and a limiting block 402. The limiting block 402 is fixed to the top of the support column 401. The bottom of the support column 401 is connected to the platform body 1. The top of the limiting block 402 is provided with a U-shaped limiting groove 4021.

[0041] The lower support part 4 is fixed to the platform body 1 by the support column 401. The limiting block 402 is installed on the top of the support column 401. The U-shaped limiting groove 4021 on the top of the block can lock the edge or protruding structure of the lower part of the bumper, thereby limiting the bumper in the horizontal direction and preventing the bumper from shifting left and right during assembly. At the same time, the support column 401 provides stable vertical support force.

[0042] This fixture, through the design of the U-shaped limiting groove 4021, can overcome the deficiency of existing technology in lacking horizontal limiting, ensuring that the bumper is fixed in position during assembly and further improving assembly accuracy; the simple fixing structure does not require complex adjustments, has high reliability, is easy to maintain, and can provide long-term stable support and limiting effects.

[0043] Specifically, refer to Figure 1 and Figure 2 The platform body 1 includes a base plate 101 and a base 102. The top of the base plate 101 is used to install the positioning mechanism 2, the upper support part 3, and the lower support part 4. The base 102 is fixed to the bottom of the base plate 101. The base plate 101 is provided with an equidistant hole system A1011 for connecting the positioning mechanism 2, an equidistant hole system B1012 for connecting the upper support part 3, and an equidistant hole system C1013 for connecting the lower support part 4. The equidistant hole system A1011 is arranged along the width direction of the platform body 1, and the equidistant hole systems B1012 and C1013 are both arranged along the length direction of the platform body 1.

[0044] The platform body 1 consists of a BASE plate 101 and a base 102. The base 102 enhances the overall stability of the platform and prevents the tooling from tipping over. The equidistant hole system A1011, B1012, and C1013 on the BASE plate 101 correspond to the installation requirements of the positioning mechanism 2, the upper support part 3, and the lower support part 4, respectively. The equidistant hole system A1011 is arranged along the width direction, which can adjust the lateral spacing of the positioning mechanism 2 to accommodate bumpers of different widths. The equidistant hole systems B1012 and C1013 are arranged along the length direction, which can adjust the longitudinal position of the upper and lower support parts to accommodate bumpers of different lengths.

[0045] This tooling uses an equidistant hole system design to allow for flexible adjustment of the installation positions of each functional component. This facilitates tooling modifications based on the bumper dimensions of new vehicle models, eliminating the need to remake the tooling and reducing the cost for companies to cope with model updates. The standardized hole layout makes component disassembly and adjustment more convenient, shortening tooling debugging time during model switching and improving production efficiency.

[0046] In one embodiment, reference Figure 3 and Figure 4The corner seat 201 is provided with a chamber 2011. The bottom of the pin 203 passes through the bottom of the pin seat 202 and extends into the interior of the chamber 2011. The pin 203 is a stud structure. The chamber 2011 is a semi-closed structure with one side open. A nut 206 is screwed to the bottom of the pin 203 through the semi-closed structure. A return spring 207 is sleeved on the pin 203 between the nut 206 and the top of the chamber 2011. The two ends of the return spring 207 abut against the top of the nut 206 and the top of the chamber 2011, respectively.

[0047] The chamber 2011 of the corner seat 201 is a semi-enclosed structure, which provides operating space for the adjustment of the bottom of the pin 203 and protects the internal components. The pin 203 is designed as a stud structure, with its bottom extending through the pin seat 202 into the chamber 2011 and screwed with a nut 206. The return spring 207, which is sleeved on the pin 203, abuts against the nut 206 and the top of the chamber 2011 at both ends, providing a continuous upward preload during the insertion, removal and rotation of the pin 203, so that the limiting protrusion 205 fits tightly against the bottom of the groove and avoids gaps.

[0048] This fixture adjusts the positioning height through the cooperation of studs, nuts 206 and return springs, ensuring a perfect fit between the bumper hole and pin 204; the preload of the return spring 207 eliminates mechanical clearance, prevents positioning deviation due to vibration during assembly, and reduces the assembly clearance between the panel and the frame; the semi-enclosed chamber facilitates later maintenance of the nut 206 and spring components, extending the service life of the fixture.

[0049] In one embodiment, reference Figure 3 and Figure 4 The corner seat 201 is provided with an interface 2012 at its top, and the bottom of the pin seat 202 is connected to a connector 2023 corresponding to the interface 2012. The corner seat 201 and the pin seat 202 are detachably connected through the interface 2012 and the connector 2023.

[0050] The interface 2012 at the top of the corner bracket 201 and the connector 2023 at the bottom of the pin seat 202 are detachably connected. When it is necessary to adapt to commercial vehicle bumpers with different hole shapes, the pin seat 202 can be directly removed and replaced with a pin seat 202 with a corresponding pin head 204 and an opening slot, without having to replace the entire positioning mechanism 2.

[0051] This tooling, through its modular and detachable design, allows it to be adapted to bumpers with more hole shapes by replacing the pin seat 202, further expanding its compatibility. Replacing only the worn pin seat 202 component eliminates the need to scrap the entire positioning mechanism, reducing maintenance costs and improving the overall cost-effectiveness of the tooling.

[0052] In one embodiment, reference Figure 5 and Figure 6 The limiting contour block 303 is made of polyurethane rubber.

[0053] The limiting contour block 303 is made of polyurethane rubber, which has good elasticity and wear resistance. When the limiting contour block 303 contacts the paint surface of the bumper through the limiting contour opening 3031, the elasticity can buffer the contact stress. At the same time, the rubber surface is smooth and has a low coefficient of friction, which can reduce the relative sliding with the paint surface.

[0054] This tooling, through the above design, can effectively solve the problem that metal or hard plastic blocks in the existing technology can easily scratch the paint surface of the bumper, protect the appearance quality of commercial vehicles, and reduce the rework cost caused by paint damage; the wear resistance of polyurethane rubber can extend the service life of the limit contour block 303 and reduce the frequency of component replacement.

[0055] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A commercial vehicle bumper assembly fixture, comprising a platform body (1), characterized in that, The platform body (1) is provided with a lifting positioning mechanism (2) in the middle. The two positioning mechanisms (2) are symmetrically arranged along the length of the platform body (1), and the top of the positioning mechanism (2) can be inserted into the hole on the bumper to position the bumper. The upper two ends of the platform body (1) are respectively provided with lifting upper support parts (3), and the lower two ends of the platform body (1) are respectively provided with lower support parts (4). The two upper support parts (3) and the two lower support parts (4) are symmetrically arranged along the length of the platform body (1). The line connecting the two upper support parts (3) and the two lower support parts (4) can form an inverted isosceles trapezoid, and the two upper support parts (3) can support the upper part of the bumper, and the two lower support parts (4) can support the lower part of the bumper.

2. The commercial vehicle bumper assembly fixture according to claim 1, characterized in that, The positioning mechanism (2) includes a corner seat (201) and a pin seat (202). The pin seat (202) is located on the top of the corner seat (201), and the bottom of the corner seat (201) is connected to the platform body (1). A removable pin (203) is inserted into the pin seat (202), and a pin head (204) located above the pin seat (202) is connected to the top of the pin head (203). The pin head (204) can... It can be inserted into the hole on the bumper; the side wall of the pin (203) is provided with a limiting protrusion (205) near the bottom of the pin head (204), and the top of the pin seat (202) is provided with a long opening groove (2021) and a short opening groove (2022) that cooperate with the limiting protrusion (205), and the limiting protrusion (205) can be inserted into the inside of the long opening groove (2021) or the short opening groove (2022).

3. The commercial vehicle bumper assembly fixture according to claim 2, characterized in that, The corner seat (201) is provided with a chamber (2011). The bottom of the pin (203) passes through the bottom of the pin seat (202) and can extend into the interior of the chamber (2011). The pin (203) is a stud structure. The chamber (2011) is a semi-closed structure with one side open. A nut (206) is screwed to the bottom of the pin (203) through the semi-closed structure.

4. The commercial vehicle bumper assembly fixture according to claim 3, characterized in that, A return spring (207) is sleeved on the pin (203) between the nut (206) and the top of the chamber (2011). The two ends of the return spring (207) abut against the top of the nut (206) and the top of the chamber (2011), respectively.

5. A commercial vehicle bumper assembly fixture according to claim 2, characterized in that, The top of the corner bracket (201) is provided with an interface (2012), and the bottom of the pin seat (202) is connected with a connector (2023) corresponding to the interface (2012). The corner bracket (201) and the pin seat (202) are detachably connected through the interface (2012) and the connector (2023).

6. The commercial vehicle bumper assembly fixture according to claim 1, characterized in that, The upper support (3) includes a column (301) and a sleeve (302). The sleeve (302) is slidably fitted onto the column (301). The bottom of the column (301) is connected to the platform body (1). A limiting contour block (303) is provided at the top of the sleeve (302). A limiting contour opening (3031) is provided on the side of the limiting contour block (303) near the positioning mechanism (2). A limiting contour opening is provided on the side wall of the column (301). The sleeve (302) has a long sliding groove (3021) and a short sliding groove (3022) on its side wall that cooperate with the limiting post (304). The short sliding groove (3022) is located on one side of the bottom of the long sliding groove (3021), and the bottom of the short sliding groove (3022) is connected to the bottom of the long sliding groove (3021). The limiting post (304) can be slidably disposed inside the long sliding groove (3021) or the short sliding groove (3022).

7. A commercial vehicle bumper assembly fixture according to claim 6, characterized in that, The limiting contour block (303) is made of polyurethane rubber.

8. A commercial vehicle bumper assembly fixture according to claim 1, characterized in that, The lower support (4) includes a support column (401) and a limiting block (402). The limiting block (402) is fixed to the top of the support column (401). The bottom of the support column (401) is connected to the platform body (1). The top of the limiting block (402) is provided with a U-shaped limiting groove (4021).

9. A commercial vehicle bumper assembly fixture according to claim 1, characterized in that, The platform body (1) includes a BASE plate (101) and a base (102). The top of the BASE plate (101) is used to install a positioning mechanism (2), an upper support (3) and a lower support (4). The base (102) is fixed to the bottom of the BASE plate (101).

10. A commercial vehicle bumper assembly fixture according to claim 9, characterized in that, The BASE plate (101) is provided with an equidistant hole system A (1011) for connecting the positioning mechanism (2), an equidistant hole system B (1012) for connecting the upper support part (3), and an equidistant hole system C (1013) for connecting the lower support part (4); the equidistant hole system A (1011) is arranged along the width direction of the platform body (1), and the equidistant hole system B (1012) and the equidistant hole system C (1013) are both arranged along the length direction of the platform body (1).

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