A rocker beam welding fixture

Abstract

The utility model discloses a kind of threshold beam welding jigs, including fixed platform (1);And first clamping component (2), be located in the fixed platform (1), for clamping threshold beam body (10);Its characterized in that: still include the movable clamping module for clamping outside accessory (20) outside the threshold beam body (10), the movable clamping module includes movable platform (3), movably installed in the fixed platform (1);Second clamping component (4), be located in the movable platform (3), for clamping the outside accessory (20);And drive mechanism (5), for driving the movable platform (3) relative to the fixed platform (1) movement.Compared with prior art, the threshold beam welding jig of the utility model can realize the clamping of threshold beam body and outside accessory and avoid interference in clamping process.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, specifically to a door sill beam welding fixture. Background Technology

[0002] On automotive welding production lines, only 30-40% of the work is actually done in welding operations, while 60-70% is auxiliary and clamping work. Since clamping is done on welding fixtures, the fixtures play a crucial role in the entire welding process.

[0003] Before welding the sill beam, the sill beam body and accessories to be welded need to be clamped and attached using a fixture. The accessories are divided into external accessories for welding to the outside of the sill beam body and internal accessories for welding to the inside of the sill beam body.

[0004] Existing fixtures typically use locating pins and clamping mechanisms to clamp the parts to be welded. For details, please refer to Chinese patent application number CN201521137261.4, "A Welding Fixture for Automobile Door Sill Beams".

[0005] However, the above structure only involves the clamping of the sill beam body. If a similar structure is used to clamp external accessories to the outside of the sill beam body, the sill beam body is prone to interference with the clamping module used to clamp external accessories during the clamping process. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a sill beam welding fixture that can clamp the sill beam body and external accessories and avoid interference during the clamping process, in light of the current state of the technology.

[0007] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a threshold beam welding fixture, including a fixed platform; and

[0008] The first clamping assembly is disposed on the fixed platform and is used to clamp the sill beam body;

[0009] Its characteristic is that it further includes a movable clamping module for clamping the external accessory onto the sill beam body, the movable clamping module including:

[0010] The movable platform is movably mounted on the fixed platform.

[0011] The second clamping assembly, disposed on the movable platform, is used to clamp the external accessory; and

[0012] A drive mechanism is used to drive the movable stage to move relative to the fixed stage.

[0013] To facilitate the clamping of the sill beam body, the sill beam body is inserted from top to bottom during the clamping process of the first clamping assembly.

[0014] The aforementioned threshold beam welding fixture has at least two states:

[0015] In the first state, the orthographic projection of the movable clamping module and the sill beam body clamped to the first clamping assembly on the horizontal plane does not overlap.

[0016] In the second state, the external accessory clamped on the second clamping assembly abuts against the top of the sill beam body clamped on the first clamping assembly.

[0017] In order to achieve the clamping of the sill beam body, the front side wall of the sill beam body has a first positioning hole extending in the front-back direction;

[0018] The first clamping assembly includes:

[0019] The first positioning pin corresponds to the first positioning hole and is used to be inserted into the corresponding first positioning hole;

[0020] The first positioning block is used to limit the position of the sill beam body to the front side;

[0021] Support block, used to support the bottom of the sill beam body;

[0022] The first clamping module, corresponding to the first positioning block, includes a first clamping block for clamping against the rear side of the sill beam body and a first driving member for driving the first clamping block to flip; and

[0023] The second clamping module, corresponding to the support block, includes a second clamping block for clamping the top of the sill beam body and a second driving member for driving the second clamping block to flip.

[0024] To ensure clamping stability, the number of the first positioning pin, the first positioning block, and the support block is at least two, and they are arranged at intervals in the left-right direction.

[0025] To prevent the sill beam body from interfering with the first and second clamping modules during clamping, an installation space is formed between the first positioning block and the first and second clamping blocks when the first and second clamping modules are open, allowing the sill beam body to be inserted from top to bottom.

[0026] To facilitate the mounting of external accessories, in the first state, the external accessories mounted on the second mounting assembly do not come into contact with the sill beam body mounted on the first mounting assembly.

[0027] To ensure a tight fit between the sill beam body and the external fitting, the top wall of the sill beam body has a first inclined surface that gradually rises from front to back, and the bottom wall of the external fitting has a second inclined surface that gradually rises from front to back.

[0028] The movable platform can be slidably mounted on the fixed platform.

[0029] In the first state, the second inclined surface of the external accessory clamped on the second clamping assembly is arranged at a distance in front of the first inclined surface of the sill beam body clamped on the first clamping assembly;

[0030] In the second state, the second inclined surface of the external accessory clamped on the second clamping assembly is in close contact with the first inclined surface of the sill beam body clamped on the first clamping assembly.

[0031] To facilitate the installation of the movable platform and the drive mechanism, a mounting platform is provided on the fixed platform, and a guide rail extending in the front-to-back direction is installed on the mounting platform. A sliding block that guides and cooperates with the guide rail is installed at the bottom of the movable platform.

[0032] The drive mechanism is mounted on the mounting platform, and its power output end is connected to the drive of the movable platform.

[0033] In order to achieve the clamping of the external accessory, the front sidewall of the external accessory has a second positioning hole extending in the front-back direction;

[0034] The second clamping assembly includes:

[0035] The second positioning pin corresponds to the second positioning hole and is used to be inserted into the corresponding second positioning hole.

[0036] A second positioning block is used to limit the external accessory to its front side; and

[0037] The third clamping module, corresponding to the second positioning block, includes a third clamping block for clamping the rear side of the external accessory and a third driving member for driving the third clamping block to flip.

[0038] To ensure clamping stability, there are at least two of each of the second locating pins and the second locating blocks, which are spaced apart in the left-right direction.

[0039] Compared with the prior art, the advantages of this utility model are as follows: the movable clamping module, composed of a movable platform, a second clamping component and a driving mechanism, clamps the external accessories to the sill beam body. Since the movable platform can move relative to the fixed platform under the drive of the driving mechanism, during the clamping process of the sill beam body, the movable platform can be moved to a clearance position to avoid interference between the movable clamping module and the sill beam body, thereby realizing the clamping of the sill beam body and the external accessories and avoiding interference during the clamping process. Attached Figure Description

[0040] Figure 1 This is a three-dimensional structural diagram of the sill beam body clamped in an embodiment of the sill beam welding fixture of this utility model.

[0041] Figure 2 This is a three-dimensional structural diagram of the external fittings clamped in an embodiment of the threshold beam welding fixture of this utility model;

[0042] Figure 3 This is a three-dimensional structural diagram of the built-in fittings clamped in an embodiment of the threshold beam welding fixture of this utility model;

[0043] Figure 4 This is a three-dimensional structural schematic diagram of an embodiment of the threshold beam welding fixture of this utility model in the first state;

[0044] Figure 5 for Figure 4 A schematic diagram of the three-dimensional structure from another direction;

[0045] Figure 6 for Figure 5 A three-dimensional structural diagram of the middle sill beam welding fixture after it has been switched to the second state;

[0046] Figure 7 for Figure 4 A three-dimensional structural diagram with some components omitted.

[0047] Figure 8 for Figure 4 A three-dimensional structural diagram of the mounting platform and movable clamping module;

[0048] Figure 9 This is a three-dimensional structural diagram of the sill beam welding fixture of this utility model after the built-in accessories are clamped into the sill beam body by an auxiliary hand clamping module.

[0049] Figure 10 for Figure 9 A three-dimensional structural diagram of the auxiliary handheld clamping module;

[0050] Figure 11 for Figure 10 A three-dimensional exploded view;

[0051] Figure 12 for Figure 10 A longitudinal sectional view of the middle limiting boss in the retracted state and the external accessories after being fitted into place around the positioning rod.

[0052] Figure 13 for Figure 9 A longitudinal sectional view. Detailed Implementation

[0053] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0054] In the specification and claims of this utility model, terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," are used to describe various exemplary structural parts and elements of this utility model. However, the use of these terms is merely for the purpose of explanation and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this utility model can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0055] like Figures 1 to 13 The image shows a preferred embodiment of the sill beam welding fixture of this utility model. This sill beam welding fixture is used to clamp two sets of sill beam assemblies, referred to as the left sill beam assembly and the right sill beam assembly, respectively. Each sill beam assembly includes a sill beam body 10, an external accessory 20, and an internal accessory 30.

[0056] In this embodiment, as Figures 1 to 3 As shown, the sill beam body 10, the external accessory 20, and the internal accessory 30 are all hollow inside.

[0057] The sill beam body 10 has two first positioning holes 101 arranged alternately in the left and right directions on the front side wall along the front-back direction; the top wall of the sill beam body 10 has a first inclined surface 102 that gradually rises from front to back; the top wall of the sill beam body 10 has two first through holes 103 arranged alternately in the left and right directions on the vertical direction; and the front side wall of the sill beam body 10 has two first through holes 103 arranged alternately in the left and right directions and a second through hole 104.

[0058] The external accessory 20 has two second positioning holes 201 that are spaced apart in the left and right directions and are opened through the front side wall along the front-back direction; the bottom wall of the external accessory 20 has a second inclined surface 202 that gradually rises from front to back.

[0059] The top wall of the built-in accessory 30 has two clearance holes 302 arranged at intervals in the left and right directions, which are vertically through the top wall. The front side wall of the built-in accessory 30 has two clearance holes 302 arranged at intervals in the left and right directions and a limiting hole 301, which are through the front and back directions. The clearance holes 302 correspond one-to-one with the first through hole 103.

[0060] In this embodiment, as Figures 4 to 13 As shown, the sill beam welding fixture includes a fixed platform 1, a first clamping assembly 2, a movable clamping module, and an auxiliary handheld clamping module 6.

[0061] The fixed platform 1 is basically horizontally arranged, with a mounting platform 11 at the front left and rear right positions. Each mounting platform 11 corresponds to the aforementioned sill beam assembly, and each mounting platform 11 is equipped with a guide rail 111 extending in the front-rear direction.

[0062] There are two sets of first clamping components 2, each corresponding to one of the aforementioned sill beam components, and they are positioned one in front of the other on the aforementioned fixing platform 1. Each first clamping component 2 is used to clamp the sill beam body 10 of the corresponding sill beam component. In this embodiment, as shown... Figure 7 As shown, each of the first clamping components 2 includes a first positioning pin 21, a first positioning block 22, a support block 23, a first pressing module 24 and a second pressing module 25, and the sill beam body 10 is inserted from top to bottom during the clamping process of the first clamping component 2.

[0063] Specifically, there are two first positioning pins 21, which are arranged at intervals in the left and right direction and correspond one-to-one with the first positioning holes 101 of the sill beam body 10. Each first positioning pin 21 is used to be inserted into the corresponding first positioning hole 101.

[0064] There are four first positioning blocks 22, which are arranged at intervals in the left and right direction. Each first positioning block 22 is used to limit the position on the front side of the sill beam body 10.

[0065] There are four support blocks 23, which are arranged at intervals in the left and right direction. Each support block 23 is used to support the bottom of the threshold beam body 10.

[0066] The number of first pressing modules 24 is four, arranged at intervals along the left and right direction, and corresponding one-to-one with the first positioning block 22. Each first pressing module 24 includes a first pressing block 241 for pressing against the rear side of the sill beam body 10 and a first driving member 242 for driving the first pressing block 241 to flip.

[0067] The number of second pressing modules 25 is three sets, arranged at intervals along the left and right direction, and corresponding to three support blocks 23. Each second pressing module 25 includes a second pressing block 251 for pressing against the top of the sill beam body 10 and a second driving member 252 for driving the second pressing block 251 to flip.

[0068] With the first clamping module 24 and the second clamping module 25 open, an installation space is formed between the first positioning block 22, the first clamping block 241, and the second clamping block 251 for the sill beam body 10 to be inserted from top to bottom.

[0069] There are two sets of movable clamping modules, each corresponding to the aforementioned sill beam assembly and mounting platform 11. Each movable clamping module is used to clamp the external accessory 20 onto the sill beam body 10. In this embodiment, each movable clamping module includes a movable platform 3, a second clamping assembly 4, and a drive mechanism 5.

[0070] The bottom of the movable platform 3 is equipped with a sliding block 31 that cooperates with the guide rail 111, thereby enabling it to slide back and forth on the corresponding fixed platform 1.

[0071] The second clamping assembly 4 is disposed on the corresponding movable platform 3 and is used to clamp the external accessory 20 of the corresponding sill beam assembly. In this embodiment, as shown... Figure 8 As shown, the second clamping assembly 4 includes a second positioning pin 41 and a second positioning block 42.

[0072] Specifically, there are two second positioning pins 41, which are arranged at intervals in the left and right direction and correspond one-to-one with the second positioning holes 201 of the external accessory 20. Each second positioning pin 41 is used to be inserted into the corresponding second positioning hole 201.

[0073] There are three second positioning blocks 42, which are arranged at intervals in the left and right direction. Each second positioning block 42 is used to limit the position on the front side of the external accessory 20.

[0074] The third clamping module 43 includes two third clamping blocks 431 for clamping on the rear side of the external accessory 20 and corresponding one-to-one with two of the second positioning blocks 42, and a third driving component 432 for driving the third clamping blocks 431 to flip.

[0075] The drive mechanism 5 is mounted on the corresponding mounting platform 11, and its power output end is connected to the corresponding movable platform 3 to drive the movable platform 3 to move back and forth relative to the fixed platform 1, so that the above-mentioned threshold beam welding fixture has at least two states:

[0076] In the first state, such as Figure 5As shown, the orthographic projections of the movable clamping module and the sill beam body 10 clamped in the first clamping assembly 2 on the horizontal plane do not overlap. The external accessory 20 clamped on the second clamping assembly 4 does not contact the sill beam body 10 clamped in the first clamping assembly 2. The second inclined surface 202 is arranged at intervals in front of the first inclined surface 102. In this way, on the one hand, the sill beam body 10 can avoid interference with the movable clamping module during the clamping process, thus facilitating the clamping of the sill beam body 10. On the other hand, the external accessory 20 can avoid interference with the sill beam body 10 after it is clamped in place during the clamping process, thus facilitating the clamping of the external accessory 20.

[0077] In the second state, such as Figure 6 As shown, the external accessory 20, which is clamped on the second clamping assembly 4, abuts against the top of the sill beam body 10, which is clamped on the first clamping assembly 2, and the second inclined surface 202 and the first inclined surface 102 are in close contact with each other. The first inclined surface 102 and the second inclined surface 202, together with the movable clamping module, can ensure that the sill beam body 10 and the external accessory 20 are in close contact, thereby facilitating subsequent welding operations.

[0078] There are two sets of auxiliary hand-held clamping modules 6, each corresponding to one of the aforementioned sill beam components. Each auxiliary hand-held clamping module 6 is used to clamp the built-in accessory 30 into the sill beam body 10. In this embodiment, as shown... Figures 9 to 13 As shown, each auxiliary handheld clamping module 6 includes a positioning rod 61, a limiting boss 62, a driving component 63, a limiting block 64, and a connecting component 65.

[0079] Specifically, the positioning rod 61 is used for mounting the built-in accessory 30 and can extend into the sill beam body 10; the end of the positioning rod 61 has a gripping part 610 for the operator to hold; a first mounting groove 611 is provided on the front side wall of the positioning rod 61 along the front-back direction; a second mounting groove 612 is provided on the end of the positioning rod 61 along the left-right direction (i.e., the length direction of the positioning rod 61) and communicates with the first mounting groove 611; two first screw holes 613 are provided on the top wall of the positioning rod 61 along the vertical direction and spaced apart in the left-right direction, and the first screw holes 613 correspond one-to-one with the first through holes 103.

[0080] The limiting boss 62 can be slidably installed in the first mounting groove 611. When the built-in accessory 30 is properly fitted onto the positioning rod 61, the head of the limiting boss 62 can be inserted into the limiting hole 301 in the extended state and can be disengaged from the limiting hole 301 in the retracted state. The tail of the limiting boss 62 has a guide groove 621, and the extension direction of the guide groove 621 has an angle with the extension direction of both the first mounting groove 611 and the second mounting groove 612. The head of the limiting boss 62 has a second screw hole 622 corresponding to the second through hole 104 in the front-back direction.

[0081] The drive assembly 63 includes an operating lever 631, a guide post 632, and an elastic element 633. The operating lever 631 is slidably inserted into the second mounting slot 612, with its head protruding from the end of the positioning rod 61. The guide post 632 is slidably mounted in the guide groove 621 and connected to the operating lever 631. The elastic element 633 is a compression spring, housed in the second mounting slot 612, with its two ends abutting against the tail of the operating lever 631 and the end face inside the second mounting slot 612, respectively, so that the operating lever 631 always has a tendency to move outward. In the absence of external force acting on the operating lever 631, such as... Figure 13 As shown, the guide post 632 can move outward with the operating rod 631 to the first end of the guide groove 621 under the elastic force of the elastic member 633, so that the head of the limiting boss 62 is kept in the extended state; when the operating rod 631 is pressed inward by an external force, as... Figure 12 As shown, the guide post 632 can move inward with the operating rod 631 to the second end of the guide groove 621, so that the head of the limiting boss 62 is in an inward retracted state;

[0082] The limiting block 64 is sleeved on the end of the positioning rod 61, and the front side of the limiting block 64 has a step portion 641 for abutting against the end face of the sill beam body 10.

[0083] The connecting assembly 65 includes a first fastener 651 for connecting the positioning rod 61 to the sill beam body 10 and a second fastener 652 for connecting the limiting boss 62 to the sill beam body 10, so that the built-in accessory 30 is clamped between the positioning rod 61 and the sill beam body 10, thereby making the outer side wall of the built-in accessory 30 tightly attached to the inner side wall of the sill beam body 10, thus facilitating subsequent welding operations; there are four first fasteners 651, which are arranged at intervals along the length of the sill beam body 10 and correspond one-to-one with the first through holes 103. Each first fastener 651 is a bolt, and the shank of the bolt passes through the corresponding first through hole 103 and the clearance hole 302 in sequence and is screwed into the corresponding first screw hole 613, so that the head of the bolt is pressed tightly against the outside of the sill beam body 10; the second fastener 652 is a bolt, and the shank of the bolt passes through the second through hole 104 and is screwed into the second screw hole 622, so that the head of the bolt is pressed tightly against the outside of the sill beam body 10.

[0084] The working principle of this embodiment is as follows: When it is necessary to weld the sill beam assembly, the sill beam body 10 is clamped first through the first clamping assembly 2, and then the external accessory 20 is clamped outside the sill beam body 10 and the internal accessory 30 is clamped inside the sill beam body 10 through the movable clamping module and the auxiliary hand clamping module 6 respectively.

[0085] Specifically, in the initial state, the sill beam welding fixture is in the first state, and each clamping module is in the open state;

[0086] The clamping process of the sill beam body 10 is as follows:

[0087] First, the sill beam body 10 is placed from top to bottom into the installation space formed between the first positioning block 22, the first clamping block 241, and the second clamping block 251. Then, the first positioning holes 101 of the sill beam body 10 are aligned with the corresponding first positioning pins 21 and inserted into place to achieve positioning of the sill beam body 10 in the left-right direction. Then, the first clamping modules 24 are closed and the sill beam body 10 is pressed onto the first positioning block 22 by the first clamping block 241 to achieve positioning of the sill beam body 10 in the front-back direction. Finally, the second clamping modules 25 are closed and the sill beam body 10 is pressed onto the support block 23 by the second clamping block 251 to achieve positioning of the sill beam body 10 in the vertical direction, thereby completing the clamping of the sill beam body 10. During this process, the sill beam welding fixture remains in the first state, and the orthographic projection of the movable clamping module and the sill beam body 10 clamped in the first clamping assembly 2 on the horizontal plane does not overlap, thereby avoiding interference between the sill beam body 10 and the movable clamping module during the clamping process.

[0088] The clamping process for external accessory 20 is as follows:

[0089] First, align each of the second positioning blocks 201 of the external accessory 20 with the corresponding second positioning pins 41 and insert them into place to achieve positioning of the external accessory 20 in the left-right and vertical directions. Then, close the third clamping module 43 and use the third clamping block 431 to press the external accessory 20 onto the second positioning block 42 to achieve positioning of the external accessory 20 in the front-back direction. At this time, as... Figure 5 As shown, the sill beam welding fixture is still in the first state, and the external accessory 20 clamped on the second clamping assembly 4 is not in contact with the sill beam body 10 clamped on the first clamping assembly 2.

[0090] Finally, the drive mechanism 5 is activated to move the movable table 3 backward, switching the sill beam welding fixture to the second state. At this time, as follows... Figure 6 As shown, the second inclined surface 202 of the external accessory 20 clamped on the second clamping assembly 4 is in close contact with the first inclined surface 102 of the sill beam body 10 clamped on the first clamping assembly 2, thereby completing the clamping of the external accessory 20 on the outside of the sill beam body 10.

[0091] The clamping process for built-in accessory 30 is as follows:

[0092] First, press the operating lever 631 to move it inward so that the head of the limiting boss 62 is in the retracted state. At the same time, put the built-in accessory 30 on the outside of the positioning lever 61. When the built-in accessory 30 is in place (e.g. Figure 12 (As shown), when the operating lever 631 is released, the head of the limiting boss 62 is reset to the extended state under the elastic force of the elastic element 633 and inserted into the limiting hole 301 of the built-in accessory 30 to realize the positioning of the built-in accessory 30 on the positioning lever 61.

[0093] Then the positioning rod 61 is inserted into the sill beam body 10 until the step portion 641 of the limiting block 64 abuts against the end face of the sill beam body 10 to achieve the positioning of the positioning rod 61 on the sill beam body 10.

[0094] Finally, the rods of each first fastener 651 are sequentially passed through the corresponding first through hole 103 and clearance hole 302 and screwed into the corresponding first screw hole 613. Simultaneously, the rods of the second fastener 652 are passed through the second through hole 104 and screwed into the second screw hole 622, so that the built-in fitting 30 is clamped between the positioning rod 61 and the sill beam body 10, thereby ensuring that the outer wall of the built-in fitting 30 is tightly against the inner wall of the sill beam body 10 (e.g., ...). Figure 13 As shown), this completes the clamping of the built-in accessory 30 inside the sill beam body 10.

Claims

1. A door sill beam welding fixture, comprising: Fixed platform (1); and The first clamping assembly (2) is disposed on the fixed platform (1) and is used to clamp the sill beam body (10); Its features are: It also includes a movable clamping module for clamping the external accessory (20) to the outside of the sill beam body (10), the movable clamping module including... The movable platform (3) is movably mounted on the fixed platform (1); The second clamping assembly (4) is provided on the movable table (3) and is used to clamp the external accessory (20); as well as The drive mechanism (5) is used to drive the movable stage (3) to move relative to the fixed stage (1).

2. The sill beam welding fixture according to claim 1, characterized in that: The threshold beam body (10) is inserted from top to bottom during the clamping process of the first clamping assembly (2); The aforementioned threshold beam welding fixture has at least two states: In the first state, the orthographic projection of the active clamping module and the threshold beam body (10) clamped to the first clamping assembly (2) on the horizontal plane does not overlap; In the second state, the external accessory (20) clamped on the second clamping assembly (4) abuts against the top of the sill beam body (10) clamped on the first clamping assembly (2).

3. The sill beam welding fixture according to claim 2, characterized in that: The front sidewall of the threshold beam body (10) has a first positioning hole (101) extending in the front-back direction; The first clamping assembly (2) includes: The first positioning pin (21) corresponds to the first positioning hole (101) and is used to be inserted into the corresponding first positioning hole (101); The first positioning block (22) is used to limit the position of the sill beam body (10) to the front side; Support block (23) is used to support the bottom of the sill beam body (10); The first pressing module (24), corresponding to the first positioning block (22), includes a first pressing block (241) for pressing against the rear side of the sill beam body (10) and a first driving member (242) for driving the first pressing block (241) to flip; and The second pressing module (25), corresponding to the support block (23), includes a second pressing block (251) for pressing against the top of the sill beam body (10) and a second driving member (252) for driving the second pressing block (251) to flip.

4. The sill beam welding fixture according to claim 3, characterized in that: The number of the first positioning pin (21), the first positioning block (22) and the support block (23) is at least two, and they are arranged at intervals in the left and right direction.

5. The sill beam welding fixture according to claim 3, characterized in that: With the first clamping module (24) and the second clamping module (25) open, an installation space is formed between the first positioning block (22) and the first clamping block (241) and the second clamping block (251) for the sill beam body (10) to be inserted from top to bottom.

6. The sill beam welding fixture according to any one of claims 2 to 5, characterized in that: In the first state, the external accessory (20) clamped on the second clamping assembly (4) does not contact the sill beam body (10) clamped on the first clamping assembly (2).

7. The sill beam welding fixture according to claim 6, characterized in that: The top wall of the threshold beam body (10) has a first inclined surface (102) that gradually rises from front to back, and the bottom wall of the external accessory (20) has a second inclined surface (202) that gradually rises from front to back. The movable platform (3) can be slidably installed on the fixed platform (1); In the first state, the second inclined surface (202) of the external accessory (20) clamped on the second clamping assembly (4) is arranged at intervals in front of the first inclined surface (102) of the sill beam body (10) clamped on the first clamping assembly (2); In the second state, the second inclined surface (202) of the external accessory (20) clamped on the second clamping assembly (4) is in close contact with the first inclined surface (102) of the sill beam body (10) clamped on the first clamping assembly (2).

8. The sill beam welding fixture according to claim 7, characterized in that: The fixed platform (1) is provided with a mounting platform (11), and a guide rail (111) extending in the front-back direction is installed on the mounting platform (11). The bottom of the movable platform (3) is provided with a sliding block (31) that guides and cooperates with the guide rail (111). The drive mechanism (5) is mounted on the mounting platform (11), and its power output end is connected to the movable platform (3) for driving.

9. The sill beam welding fixture according to claim 7, characterized in that: The external accessory (20) has a second positioning hole (201) extending in the front-rear direction on its front side wall; The second clamping assembly (4) includes: The second positioning pin (41) corresponds to the second positioning hole (201) and is used to be inserted into the corresponding second positioning hole (201); The second positioning block (42) is used to limit the external accessory (20) to the front side; as well as The third clamping module (43), corresponding to the second positioning block (42), includes a third clamping block (431) for clamping the rear side of the external accessory (20) and a third driving member (432) for driving the third clamping block (431) to flip.

10. The sill beam welding fixture according to claim 9, characterized in that: The number of the second positioning pin (41) and the second positioning block (42) is at least two, and they are arranged at intervals in the left and right directions.

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