CN117226731A - Front bumper assembly tool and front bumper assembly method - Google Patents

Abstract

The embodiment of the application discloses a front bumper assembly fixture and a front bumper assembly method. This front bumper assembly fixture passes through locating component location and connects on the automobile body for the front bumper can be all the time with clearance assurance subassembly laminating when opening behind the car bonnet and tightening the front bumper, need not to adjust the location repeatedly, has practiced thrift assembly time, can effectively guarantee the uniformity and the stability of assembly clearance simultaneously.

Description

Front bumper assembly tool and front bumper assembly method

Technical Field

The application relates to the technical field of automobile assembly, in particular to a front bumper assembly fixture and a front bumper assembly method.

Background

With the rapid development of the automobile industry, people have higher requirements on the performance of the automobile and the appearance refinement level of the automobile body. Aiming at the appearance requirement, automobile assembly personnel are required to formulate an effective assembly scheme to assemble the automobile body, so that the expected requirement of people on the automobile is met.

The front end region of an automobile is generally a region of interest in the overall appearance of the automobile body, and whether or not the gap between the front bumper B and the automobile cover a having a seam facing the sky is smooth and consistent determines the aesthetic appearance of the front end region of the automobile. The structure of the existing assembly fixture is shown in fig. 1 and 2, when the front bumper B is assembled to a vehicle body, the front bumper B needs to be preassembled, then a gap plug piece on the assembly fixture is placed between the front bumper B and the vehicle cover A and the gap between the front bumper B and the vehicle cover A is adjusted, the assembly fixture is taken out, the position of the front bumper B needs to be manually ensured not to move in the taking-out process, and then the front bumper B is fastened with the vehicle body after the vehicle cover A is opened. In this case, the tightening point of the front bumper is covered by the automobile hood a after closing the automobile hood a, so that the front bumper cannot be fastened, and therefore the front bumper must be fastened by opening the automobile hood a. However, when the front bumper B is manually fastened by opening the automobile cover a, it is often difficult to accurately fix the position of the front bumper B, and at this time, a person who assembles the front bumper B needs to repeatedly open and close the automobile cover to adjust the gap value between the front bumper B and the automobile cover a, which is time-consuming and labor-consuming, and it is difficult to control the stability and consistency of the gap between the automobile cover a and the front bumper B.

Disclosure of Invention

In view of the above, the embodiment of the application provides a front bumper assembly tool and a front bumper assembly method, which can effectively ensure smoothness and consistency of a gap between an automobile cover and a front bumper.

In a first aspect, an embodiment of the present application provides a front bumper assembly fixture, including:

a support frame;

the positioning assembly is used for positioning the vehicle body and is connected to the supporting frame;

the gap guaranteeing assemblies are movably connected to the supporting frame and are used for being movably arranged between the automobile cover and the front bumper;

the sliding guide mechanisms are in sliding connection with the supporting frames, and the end parts of the sliding guide mechanisms are fixedly connected with the corresponding clearance assurance assemblies.

Further, the assembly fixture further comprises:

the elastic connecting pieces are connected between the supporting frame and the corresponding sliding guide mechanisms;

and a plurality of locking pieces respectively connected with the sliding guide mechanisms in a locking way.

Further, the sliding guide mechanism is in sliding connection with the support frame in a mode of matching with the sliding rail through the sliding groove.

Further, the support frame includes a plurality of spouts that have side direction opening and a plurality of locking hole that have open-top, the locking hole with correspond the spout intercommunication, sliding guide mechanism is sliding connection in the slide rail in the spout that corresponds, elastic connection spare is connected in the correspondence the bottom of spout with between the slide rail, the clearance guarantee subassembly sets up in the outside of spout and with the end connection of slide rail, the locking piece with the locking hole is connected and the butt is in on the slide rail.

Further, the sliding guide mechanism comprises a chute seat with a chute and a sliding rail, wherein the chute seat is fixed between the tail end of the supporting frame and the sliding rail, the clearance ensuring assembly is fixedly connected with the end part of the sliding rail, the sliding rail is provided with a through locking hole, and the locking piece passes through the locking hole and is abutted to the chute seat.

Further, the clearance ensuring assembly comprises an extension plate and a clearance plug piece, one end of the extension plate is fixedly connected with the corresponding sliding guide mechanism, the other end of the extension plate extends outwards to be fixedly connected with the clearance plug piece, and the clearance plug piece extends upwards perpendicular to the extension plate.

Further, the gap plug piece is provided with a profiling surface which is locally consistent with the edge of the automobile cover and the edge of the front bumper.

Further, the assembly fixture comprises three clearance guarantee assemblies which are vertically arranged on the same side of the support frame, two clearance guarantee assemblies are respectively arranged at two ends of the support frame, and the other clearance guarantee assembly is arranged at the middle position of the support frame.

Further, the positioning assembly includes a first link, a second link, a third link, a fourth link, a fifth link, and a sixth link.

Further, the first connecting rod, the second connecting rod, the fifth connecting rod and the sixth connecting rod are vertically connected to one side, opposite to the clearance guarantee assembly, of the support frame, the third connecting rod and the fourth connecting rod are vertically connected to one side, opposite to the first connecting rod, of the support frame, the fifth connecting rod and the sixth connecting rod are connected to two ends of the support frame, the first connecting rod and the second connecting rod are located between the fifth connecting rod and the sixth connecting rod, and the third connecting rod and the fourth connecting rod are located between the first connecting rod and the second connecting rod.

Further, the end parts of the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod are fixedly connected with profiling positioning blocks, and the end parts of the fifth connecting rod and the sixth connecting rod are connected with positioning pins.

Further, the bottom surface of the profiling positioning block is provided with a profiling surface which is partially consistent with the vehicle body.

In a second aspect, an embodiment of the present application provides a front bumper assembly method including the steps of:

fixing a front bumper assembly tool on a vehicle body below a vehicle cover;

closing the automobile cover;

the method comprises the steps that a plurality of gap guaranteeing assemblies of a front bumper assembly fixture are pulled and then are connected with the edge of an automobile cover in a fitting mode;

a plurality of gap ensuring assemblies locked to move to the above positions;

opening the automobile cover;

after pushing the front bumper to be attached to the plurality of gap ensuring assemblies, assembling the front bumper and the vehicle body together through bolts;

taking out the front bumper assembly fixture;

the automobile cover is closed to check the assembly gap of the automobile cover and the front bumper.

The embodiment of the application provides a front bumper assembly fixture and a front bumper assembly method. This front bumper assembly fixture passes through locating component location and connects on the automobile body for the front bumper can be all the time with clearance assurance subassembly laminating when opening behind the car bonnet and tightening the front bumper, need not to adjust the location repeatedly, has practiced thrift assembly time, can effectively guarantee the uniformity and the stability of assembly clearance simultaneously.

Drawings

The above and other objects, features and advantages of the present application will become more apparent from the following description of embodiments of the present application with reference to the accompanying drawings, in which:

FIG. 1 is a schematic view of a conventional front bumper assembly fixture for assisting in assembling an automobile hood and a front bumper;

FIG. 2 is a schematic structural view of a conventional front bumper assembly fixture;

FIG. 3 is a top view of a front bumper assembly fixture according to an embodiment of the present application;

FIG. 4 is a schematic structural view of a front bumper assembly fixture according to an embodiment of the present application;

FIG. 5 is a partial schematic view of a front bumper assembly tooling according to an embodiment of the present application;

FIG. 6 is a schematic view of a sliding guide mechanism according to an embodiment of the present application;

FIG. 7 is a schematic view of a slide guide mechanism according to an embodiment of the present application;

FIG. 8 is a schematic view of a front bumper assembly fixture for assisting in assembling an automobile hood and a front bumper according to an embodiment of the present application;

fig. 9 is a flowchart of a front bumper assembly method according to an embodiment of the present application.

The reference numerals:

1-a supporting frame; 11-a chute; 12-locking holes; 2-positioning assembly; 21-a first link; 22-a second link; 23-a third link; 24-fourth link; 25-a fifth link; 26-sixth link; 27-profiling positioning blocks; 28-locating pins; 3-a gap assurance assembly; 31-an extension plate; 32-gap plugs; 4-a sliding guide mechanism; 41-sliding rails; 43-a chute seat; a 5-elastic connection; 6-locking piece; a-automobile cover; b-front bumper.

Detailed Description

The present application is described below based on examples, but the present application is not limited to only these examples. In the following detailed description of the present application, certain specific details are set forth in detail. The present application will be fully understood by those skilled in the art without the details described herein. Well-known methods, procedures, flows, components and circuits have not been described in detail so as not to obscure the nature of the application.

Moreover, those of ordinary skill in the art will appreciate that the drawings are provided herein for illustrative purposes and that the drawings are not necessarily drawn to scale.

Unless the context clearly requires otherwise, the words "comprise," "comprising," and the like in the description are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, it is the meaning of "including but not limited to".

In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

Unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly, as they may be fixed, removable, or integral, for example; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

Fig. 3 to 7 are schematic structural views of the front bumper assembly fixture of the present embodiment. The front bumper assembly tool is used as an auxiliary tool for assembling the front bumper B in the automobile manufacturing process, the front bumper B can be quickly and accurately mounted on an automobile body through the auxiliary tool, and the mounting position of the front bumper B and the matching relation with peripheral parts (such as an automobile cover A) are ensured.

Specifically, the front bumper assembly fixture includes a support frame 1, a positioning assembly 2, and a plurality of gap ensuring assemblies 3, as shown in fig. 3 and 4. The positioning assembly 2 is connected to the support frame 1 and is used for fixing and positioning the front bumper assembly fixture on the vehicle body, so that the front bumper assembly fixture can continuously assist the front bumper B in positioning and assembling on the vehicle body after the automobile cover A is opened, repeated positioning can be avoided, the assembly precision is improved, and the stability and consistency of a gap between the automobile cover A and the front bumper B are ensured. A plurality of gap ensuring assemblies 3 are movably attached to the support frame 1. After the positioning component 2 is positioned on the vehicle body, the plurality of gap ensuring components 3 can be movably attached to different parts of the edge of the automobile cover A, so that the consistency and smoothness of gaps at different positions of the automobile cover A and the front bumper B can be ensured. Wherein, a plurality of clearance assurance components 3 are connected at the side that support frame 1 is close to front bumper B, and when the car bonnet A closes promptly, a plurality of clearance assurance components 3 are connected at the side that support frame 1 is close to car bonnet A edge. The setting positions of the plurality of clearance assurance assemblies 3 are such that the clearance assurance assemblies 3 can be moved to the outer side of the automobile cover A to be clamped with the edge of the automobile cover A.

Wherein, the support frame 1 can be formed by steel, metal plate and the like. The support frame 1 may also be connected in sequence by a plurality of links to form a frame structure. The length of the support frame 1 can enable the positioning assembly 2 to be positioned with different parts of the vehicle body below the automobile cover A. Preferably, the supporting frame 1 may have a certain radian, and may avoid other parts in the chassis when being connected with the vehicle body in a positioning manner, and meanwhile, when the automobile cover a is closed, the supporting frame 1 may also avoid the upper automobile cover a.

The positioning component 2 is connected with the support frame 1 and is used for being positioned on a vehicle body, the assembly fixture can be prevented from being taken down when the front bumper B is tightly assembled, the installation position of the front bumper B can be still positioned when the front bumper B is tightly assembled by the gap guaranteeing components 3, and therefore the consistency and smoothness of the gap between the front bumper B and the vehicle cover A can be effectively guaranteed.

In the present embodiment, the positioning assembly 2 includes a first link 21, a second link 22, a third link 23, a fourth link 24, a fifth link 25, and a sixth link 26, as shown in fig. 3 and 4. The first link 21, the second link 22, the fifth link 25 and the sixth link 26 may be vertically connected to a side of the support frame 1 facing away from the gap securing assembly 3, and the third link 23 and the fourth link 24 may be vertically connected to a side of the support frame 1 facing away from the first link 21.

The fifth connecting rod 25 and the sixth connecting rod 26 are connected to two ends of the supporting frame 1, and positioning pins 28 are connected to ends of the fifth connecting rod 25 and the sixth connecting rod 26, as shown in fig. 4. Correspondingly, a positioning hole is arranged on the vehicle body. The support frame 1 is connected with the positioning holes on the vehicle body in a positioning way through the two positioning pins 28, so that the support frame 1 can be prevented from shaking. The positioning hole on the vehicle body can be formed by processing during subsequent assembly, or can be an internal threaded hole and the like arranged on the vehicle body. Preferably, two positioning pins 28 are disposed at two ends of the support frame 1 along the length direction, so that the positioning of the gap guaranteeing assembly 3 by the gap guaranteeing assembly can be avoided from being influenced by tilting one end of the support frame 1. The locating pin 28 and the locating hole of the body may also be replaced with a lock nut and a threaded hole.

The first link 21 and the second link 22 are located between the fifth link 25 and the sixth link 26, and the third link 23 and the fourth link 24 are located between the first link 21 and the second link 22, as shown in fig. 3. The ends of the first connecting rod 21, the second connecting rod 22, the third connecting rod 23 and the fourth connecting rod 24 are fixedly connected with a profiling positioning block 27, as shown in fig. 4. Four profile modeling locating pieces 27 can be laid to form a polygon structure and lay in the automobile body both sides for with the stable location of support frame 1 on the automobile body, can avoid the assembly fixture to rock. Preferably, the bottom surface of the profiling positioning block 27 is provided with a profiling surface which is partially consistent with the car body, so that the profiling positioning block is convenient to be better attached and positioned with the car body, and shaking is avoided. The material of the profiling positioning block 27 may be plastic or the like.

Wherein the first link 21, the second link 22, the third link 23, the fourth link 24, the fifth link 25 and the sixth link 26 may be fixed at different positions of the support frame 1 by bolting or welding. The positioning pin 28 and the profiling positioning block 27 may be fixed on the corresponding connecting rod by a threaded connection method, a welding method, or the like.

In other embodiments, the number of the profiling positioning blocks 27 may be greater than or equal to four, and the profiling positioning blocks are respectively arranged at different positions of the support frame 1 through connecting rods. The links may be connected to the support 1 in other angular ways.

In this embodiment, the assembly fixture further includes a plurality of sliding guide mechanisms 4, a plurality of elastic connectors 5, and a plurality of locking members 6, as shown in fig. 5 and 6. The sliding guide mechanism 4 is slidably connected with the support frame 1, and the outer end part of the sliding guide mechanism 4 is fixedly connected with the corresponding gap guaranteeing assembly 3. The slide guide mechanism 4 is used for guiding when the gap ensuring assembly 3 moves so as to ensure that the gap ensuring assembly 3 moves along a straight line. The elastic connecting piece 5 is connected between the supporting frame 1 and the corresponding sliding guide mechanism 4. When the gap ensuring assembly 3 moves to be clamped with the edge of the automobile cover A in a fitting way, the elastic connecting piece 5 tightens the gap ensuring assembly 3 through the generated elastic force, so that the gap ensuring assembly 3 can be clamped with the edge of the automobile cover A in a fitting way. The locking member 6 is used to lock the slide guide mechanism 4 moved to a predetermined position so that the gap securing assembly 3 can be positioned at the predetermined position for positioning assembly of the front bumper after the opening of the automobile hood a.

Preferably, the sliding guide mechanism 4 and the support frame 1 may be slidably connected through a sliding slot 11 and a sliding rail 41 in a matching manner. In one embodiment, the support frame 1 includes a plurality of slide grooves 11 having lateral openings and a plurality of locking holes 12 having top openings, as shown in fig. 6. Wherein the locking holes 12 are communicated with the corresponding sliding grooves 11. The sliding guide mechanism 4 is arranged as a sliding rail 41 which is in sliding connection with the corresponding sliding groove 11, the elastic connecting piece 5 is connected between the bottom of the corresponding sliding groove 11 and the sliding rail 41, and the clearance ensuring assembly 3 is arranged outside the sliding groove 11 and is fixedly connected with the outer end part of the sliding rail 41. The gap ensuring assembly 3 can be moved in a directional manner by sliding the slide rail 41 in the slide groove 11. When the gap ensuring assembly 3 moves to a predetermined position, the locking member 6 may be connected to the locking hole 12 and abut against the sliding rail 41, so that the gap ensuring assembly 3 is relatively fixed. The locking hole 12 may be a threaded through hole, and the locking member 6 shown in fig. 6 is only an example, and may be a common screw, a locking screw having a convenient operation, or the like. The locking member 6 limits the movement displacement of the clearance assurance module 3 by the friction force generated by the end portion thereof and the slide rail 41. Wherein, a clearance assurance module 3 can be slidably connected by one, two or even a plurality of slide rails 41 for improving the stability of the movement of the clearance assurance module 3.

In another embodiment, the sliding guide mechanism 4 includes a chute seat 43 having a chute 11 and a slide rail 41, as shown in fig. 7. The chute seat 43 may be fixed on the top or bottom of the support frame 1, and the slide rail 41 may be slidably connected in the chute 11. The end of the chute 11 is provided with a stop, and the elastic connection member 5 is connected between the stop and the slide rail 41. In this embodiment, the shape of the chute 11 is such that the slide rail 41 is prevented from being disengaged from the chute 11 when the slide rail 41 moves in the chute 11. For example, the chute 11 and the slide rail 41 may be configured in an i-shaped structure that is matingly connected to each other.

The gap ensuring assembly 3 is fixedly connected with the outer end part of the sliding rail 41, and the sliding rail 41 can drive the gap ensuring assembly 3 to move in a positioning way. The sliding rail 41 is provided with a through locking hole 12, and the locking piece 6 can be connected with the locking hole 12 and pass through the locking hole 12 to be abutted with the chute seat 43 to generate friction resistance, so that the clearance ensuring assembly 3 can be fixed at a preset position. Preferably, the locking hole 12 may be a threaded through hole, and the locking member 6 may be a locking screw or the like. The locking element 6 shown in fig. 7 is only one example. Wherein, a clearance assurance module 3 can be slidably connected through one, two or even a plurality of sliding guide mechanisms 4 for improving the stability of the movement of the clearance assurance module 3.

In the present application, the gap ensuring assembly 3 includes an extension plate 31 and a gap stopper 32, as shown in fig. 6 and 7. One end of the extending plate 31 is fixedly connected with the sliding rail 41 of the sliding guide mechanism 4, the other end of the extending plate 31 extends outwards to be fixedly connected with the gap plug 32, and the gap plug 32 extends upwards perpendicular to the extending plate 31. The gap plug 32 extends upward and can be inserted outside the edge of the automobile hood a. Preferably, the gap stopper 32 may be provided with a profile surface partially conforming to the edges of the automobile hood a and the front bumper B so that the gap between the automobile hood a and the front bumper B is maintained to be uniform. The plurality of gap plugs 32 can be attached to a plurality of different positions between the edge of the automobile cover a and the edge of the front bumper B, so that smoothness and stability of the gap between the automobile cover a and the front bumper B can be ensured. In this embodiment, the assembly fixture includes three gap ensuring assemblies 3 vertically disposed on the same side of the support frame 1, and are slidably connected with the support frame 1 through sliding guide mechanisms 4 respectively. Wherein, two clearance assurance subassemblies 3 set up respectively the both ends of support frame 1, a clearance assurance subassembly 3 sets up the intermediate position of support frame 1 to make both ends and the intermediate position in the clearance that forms between car bonnet A and front bumper B all be provided with clearance stopper piece 32, thereby can guarantee the uniformity and the stability of whole clearance.

The clearance plug of front bumper assembly fixture of this embodiment can lock the border position of car bonnet, does not take place the displacement when the car bonnet is opened, can effectively guarantee the correct mounted position of front bumper. Meanwhile, the front bumper assembly fixture is directly positioned on the vehicle body, the positioning mode is more stable, and the assembly repeatability and consistency are better.

Fig. 9 is a front-bumper assembling method of the present embodiment, which assembles a front bumper using the front-bumper assembling tool in the above-described embodiment. As shown in fig. 9, the assembling method includes the steps of:

step S10, fixing the front bumper assembly tool on the body below the automobile cover A.

The plurality of profiling positioning blocks 27 of the front-bumper assembly fixture of the above embodiment are attached to the vehicle body, and then the positioning pins 28 are locked to the vehicle body or the profiling positioning blocks 27 are locked to the vehicle body, thereby positioning the front-bumper assembly fixture on the vehicle body.

And S20, closing the automobile cover.

And S30, pulling the plurality of gap guaranteeing assemblies of the front bumper assembly fixture and then connecting the gap guaranteeing assemblies with the edge of the automobile cover in a fitting way.

The plurality of gap ensuring assemblies 3 are attached to different parts of the edge of the automobile cover A after being moved in an oriented manner through the respective sliding guide mechanisms 4. In this process, the elastic connection member 5 can apply a restoring force to the gap ensuring member 3, so that the gap ensuring member 3 can be ensured to be closely attached to the automobile hood a.

Step S40, locking the plurality of gap ensuring assemblies which move to the positions.

The slide guide mechanism 4 is locked by the locking member 6, whereby the plurality of gap ensuring members 3 are locked to a position in abutting connection with the edge of the automobile hood a. Wherein the assembly personnel can lock the locking member 6 by means of other transmission components through a slit or the like in the vehicle body.

And S50, opening the automobile cover.

When the automobile cover A is opened, the position of the front bumper assembly fixture is kept still, and the positions of the plurality of clearance assurance assemblies 3 are different.

And S60, after the front bumper is pushed to be attached to the plurality of gap ensuring assemblies, assembling the front bumper and the vehicle body together through bolts.

The front bumper B is preassembled with the vehicle body, and then the front bumper B is tightened. The front bumper B is pushed by hand in the tightening process of the front bumper B, and the bolts near the position are tightened after the front bumper B is tightly attached to the gap ensuring assembly 3. Preferably, two ends of the front bumper B may be respectively fastened to the two gap ensuring assemblies 3 at the two ends, the adjacent bolts may be fastened, and finally the front bumper B at the middle position may be fastened to the middle gap ensuring assembly 3 and the adjacent bolts may be fastened, thereby completing the assembly of the front bumper B.

And step S70, taking out the front bumper assembly fixture.

After the front bumper B is assembled, the locking piece 6 is released, the clearance ensuring assembly 3 is reset, and then the front bumper assembly fixture is taken out. Or directly taking out the front bumper assembly fixture after the front bumper B is assembled.

And S80, closing the automobile cover to check the assembly gap between the automobile cover and the front bumper.

The automobile cover a is re-closed to check the clearance between the automobile cover a and the front bumper B as shown in fig. 8.

The embodiment of the application provides a front bumper assembly fixture and a front bumper assembly method. This front bumper assembly fixture passes through locating component location and connects on the automobile body for the front bumper can be all the time with clearance assurance subassembly laminating when opening behind the car bonnet and tightening the front bumper, need not to adjust the location repeatedly, has practiced thrift assembly time, can effectively guarantee the uniformity and the stability of assembly clearance simultaneously.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, and various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (13)

1. Front bumper assembly fixture, its characterized in that, assembly fixture includes:

a support (1);

the positioning assembly (2) is used for positioning the vehicle body and is connected to the support frame (1);

a plurality of gap ensuring assemblies (3) which are movably connected to the supporting frame (1), wherein the gap ensuring assemblies (3) are used for being movably arranged between the automobile cover (A) and the front bumper (B);

and the sliding guide mechanisms (4) are in sliding connection with the support frame (1), and the end parts of the sliding guide mechanisms (4) are fixedly connected with the corresponding gap guarantee assemblies (3).

2. The assembly fixture of claim 1, further comprising:

a plurality of elastic connecting pieces (5) connected between the supporting frame (1) and the corresponding sliding guide mechanism (4);

and a plurality of locking pieces (6) which are respectively connected with the sliding guide mechanisms (4) which move to the preset positions in a locking way.

3. The assembly fixture according to claim 2, wherein the sliding guide mechanism (4) is slidably connected with the support frame (1) in a manner of being matched with the sliding rail (41) through the sliding groove (11).

4. The assembly fixture according to claim 3, wherein the supporting frame (1) comprises a plurality of sliding grooves (11) with lateral openings and a plurality of locking holes (12) with top openings, the locking holes (12) are communicated with the corresponding sliding grooves (11), the sliding guide mechanism (4) is a sliding rail (41) which is in sliding connection with the corresponding sliding grooves (11), the elastic connecting piece (5) is connected between the bottom of the corresponding sliding grooves (11) and the sliding rail (41), the gap guaranteeing assembly (3) is arranged outside the sliding grooves (11) and is connected with the end portions of the sliding rail (41), and the locking piece (6) is connected with the locking holes (12) and is abutted to the sliding rail (41).

5. The assembly fixture according to claim 3, wherein the sliding guide mechanism (4) comprises a chute seat (43) with a chute (11) and a sliding rail (41), the chute seat (43) is fixed on the support frame (1), the sliding rail (41) is slidably connected in the chute (11), the elastic connecting piece (5) is connected between the tail end of the chute (11) and the sliding rail (41), the clearance ensuring assembly (3) is fixedly connected with the end part of the sliding rail (41), the sliding rail (41) is provided with a through locking hole (12), and the locking piece (6) is abutted to the chute seat (43) through the locking hole (12).

6. Assembly fixture according to any one of claims 1-5, wherein the gap ensuring assembly (3) comprises an extension plate (31) and a gap plug piece (32), one end of the extension plate (31) is fixedly connected with the corresponding sliding guide mechanism (4), the other end of the extension plate (31) extends outwards to be fixedly connected with the gap plug piece (32), and the gap plug piece (32) extends upwards perpendicular to the extension plate (31).

7. The assembly fixture according to claim 6, wherein the gap plug (32) is provided with a profiling surface locally conforming to the edges of the automobile hood (a) and the front bumper (B).

8. Assembly fixture according to any one of claims 1-5, characterized in that the assembly fixture comprises three gap ensuring assemblies (3) arranged vertically on the same side of the support frame (1), two gap ensuring assemblies (3) being arranged at the two ends of the support frame (1) respectively, the other gap ensuring assembly (3) being arranged in the middle position of the support frame (1).

9. The assembly fixture according to claim 1, wherein the positioning assembly (2) comprises a first link (21), a second link (22), a third link (23), a fourth link (24), a fifth link (25) and a sixth link (26).

10. The assembly fixture according to claim 9, wherein the first link (21), the second link (22), the fifth link (25) and the sixth link (26) are vertically connected to a side of the support frame (1) facing away from the gap ensuring assembly (3), the third link (23) and the fourth link (24) are vertically connected to a side of the support frame (1) facing away from the first link (21), the fifth link (25) and the sixth link (26) are connected to both ends of the support frame (1), the first link (21) and the second link (22) are located between the fifth link (25) and the sixth link (26), and the third link (23) and the fourth link (24) are located between the first link (21) and the second link (22).

11. The assembly fixture according to claim 9 or 10, wherein the ends of the first connecting rod (21), the second connecting rod (22), the third connecting rod (23) and the fourth connecting rod (24) are fixedly connected with profiling positioning blocks (27), and the ends of the fifth connecting rod (25) and the sixth connecting rod (26) are connected with positioning pins (28).

12. The assembly fixture according to claim 11, wherein the bottom surface of the profiling positioning block (27) is provided with a profiling surface which is locally consistent with the vehicle body.

13. A front bumper assembly method, characterized in that the assembly method comprises the steps of:

fixing a front bumper assembly tool on a vehicle body below a vehicle cover (A);

closing the automobile cover (A);

a plurality of gap ensuring assemblies (3) of the front bumper assembly fixture are pulled and then are connected with the edge of the automobile cover (A) in a fitting way;

a plurality of gap ensuring assemblies (3) which are locked and moved to the positions;

opening the automobile cover (A);

after the front bumper (B) is pushed to be attached to the plurality of gap ensuring assemblies (3), the front bumper (B) and the vehicle body are assembled together through bolts;

taking out the front bumper assembly fixture;

the automobile cover (A) is closed to check the assembly gap between the automobile cover (A) and the front bumper (B).