An auxiliary handheld clamping module and a sill beam welding fixture

Abstract

This invention discloses an auxiliary handheld clamping module for clamping a hollow built-in accessory into a hollow sill beam body. The module is characterized by: a limiting hole on the side of the built-in accessory; a positioning rod for fitting the built-in accessory and extending into the sill beam body, the positioning rod having a first mounting groove on its side; a limiting boss slidably mounted in the first mounting groove, the head of which can be inserted into the limiting hole in an extended state and disengaged from the limiting hole in an inward state when the built-in accessory is fitted onto the positioning rod; a driving assembly for driving the limiting boss to slide; a limiting block mounted on the end of the positioning rod, having a stepped portion for abutting against the end face of the sill beam body; and a first fastener for connecting the positioning rod and the sill beam body. This invention also discloses a sill beam welding fixture using this auxiliary handheld clamping module.

Description

Technical Field

[0001] This invention relates to the field of automotive parts technology, specifically to an auxiliary handheld clamping module and 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. The built-in accessories still need to be placed directly into the sill beam body by manual means. It is impossible to achieve precise positioning of the built-in accessories inside the sill beam body and tight fit with the sill beam body, thus affecting the subsequent welding operation. Summary of the Invention

[0006] The first technical problem to be solved by the present invention is to provide an auxiliary handheld clamping module that can accurately clamp the built-in accessories into the sill beam body and ensure a tight fit between the two, in light of the current state of the prior art.

[0007] The second technical problem to be solved by the present invention is to provide a sill beam welding fixture with an upper auxiliary hand-held clamping module.

[0008] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: an auxiliary handheld clamping module for clamping a hollow built-in accessory into a hollow sill beam body, characterized in that: the side of the built-in accessory has a limiting hole;

[0009] The auxiliary handheld clamping module includes:

[0010] A positioning rod is used for mounting the built-in accessories and can extend into the sill beam body. The side of the positioning rod has a first mounting groove.

[0011] The limiting boss is slidably installed in the first mounting groove. When the built-in accessory is in place on the outer sleeve of the positioning rod, the head of the limiting boss can be inserted into the limiting hole in the extended state and can be disengaged from the limiting hole in the retracted state.

[0012] A driving component is used to drive the limiting boss to slide.

[0013] A limiting block, installed at the end of the positioning rod, has a stepped portion for abutting against the end face of the sill beam body; and

[0014] The first fastener is used to connect the positioning rod and the sill beam body so that the built-in accessory is clamped between the positioning rod and the sill beam body, thereby making the outer side wall of the built-in accessory tightly attached to the inner side wall of the sill beam body.

[0015] In order to drive the limiting boss to slide, the end of the positioning rod has a second mounting groove that communicates with the first mounting groove;

[0016] The tail of the limiting boss has a guide groove, and the extension direction of the guide groove has an angle with the extension direction of both the first mounting groove and the second mounting groove.

[0017] The driving component includes:

[0018] An operating lever is slidably inserted into the second mounting slot, with its head protruding from the end of the positioning rod.

[0019] A guide post, slidably mounted within the guide groove and connected to the operating lever; and

[0020] An elastic element acts between the operating lever and the positioning lever to ensure that the operating lever always has a tendency to move outward.

[0021] When no external force is applied to the operating lever, the guide post can move outward with the operating lever to the first end of the guide groove under the elastic force of the elastic element, so that the head of the limiting boss is kept in the extended state.

[0022] When the operating lever is pressed inward by an external force, the guide post can move inward with the operating lever to the second end of the guide groove, so that the head of the limiting boss is in a retracted state.

[0023] To facilitate the installation of the elastic element, the elastic element is a compression spring, which is housed in the second mounting groove. The two ends of the compression spring abut against the tail of the operating lever and the end face inside the second mounting groove, respectively.

[0024] To ensure connection stability, the number of the first fasteners is at least two, and they are arranged at intervals along the length of the sill beam body.

[0025] To facilitate the connection between the positioning rod and the sill beam body, the side of the sill beam body has a first through hole, the side of the built-in accessory has a clearance hole corresponding to the first through hole, and the side of the positioning rod has a first screw hole corresponding to the first through hole.

[0026] The first fastener is a bolt, the shank of which passes through the first through hole and the clearance hole in sequence and is screwed into the first threaded hole, so that the head of the bolt is pressed tightly against the outside of the sill beam body.

[0027] To ensure that the limiting boss remains stably in the extended state after the built-in accessories are clamped, a second fastener is also included to connect the limiting boss to the sill beam body.

[0028] To facilitate the connection between the limiting boss and the sill beam body, the side of the sill beam body has a second through hole, and the head of the limiting boss has a second screw hole corresponding to the second through hole.

[0029] The second fastener is a bolt, the shank of which passes through the second through hole and is screwed into the second threaded hole, so that the head of the bolt is pressed tightly against the outside of the sill beam body.

[0030] The technical solution adopted by the present invention to solve the second technical problem mentioned above is: a sill beam welding fixture, comprising:

[0031] Fixed platform;

[0032] The first clamping assembly is disposed on the fixed platform and is used to clamp the sill beam body.

[0033] Its characteristic is that it uses the above-mentioned auxiliary handheld clamping module.

[0034] 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;

[0035] The first clamping assembly includes:

[0036] The first positioning pin corresponds to the first positioning hole and is used to be inserted into the corresponding first positioning hole;

[0037] The first positioning block is used to limit the position of the sill beam body to the front side;

[0038] Support block, used to support the bottom of the sill beam body;

[0039] 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

[0040] 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.

[0041] 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.

[0042] Compared with the prior art, the advantages of the present invention are as follows: the auxiliary handheld clamping module is composed of a positioning rod, a limiting boss, a driving component, a limiting block, and a first fastener. During operation, the built-in accessory is first sleeved on the positioning rod, and the head of the limiting boss is driven to extend outward by the driving component to position the built-in accessory on the positioning rod. Then, the positioning rod is inserted into the sill beam body until the step of the limiting block abuts against the end face of the sill beam body to position the positioning rod on the sill beam body. Finally, the positioning rod and the sill beam body are connected by the first fastener so that the built-in accessory is clamped between the positioning rod and the sill beam body to achieve a tight fit between the built-in accessory and the sill beam body, thereby completing the clamping of the built-in accessory inside the sill beam body. This solution can accurately clamp the built-in accessory inside the sill beam body and ensure a tight fit between the two. Attached Figure Description

[0043] 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 the present invention;

[0044] Figure 2 This is a three-dimensional structural diagram of the external fittings clamped in an embodiment of the threshold beam welding fixture of the present invention;

[0045] 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 the present invention;

[0046] Figure 4 This is a three-dimensional structural schematic diagram of an embodiment of the sill beam welding fixture of the present invention in its first state;

[0047] Figure 5 for Figure 4 A schematic diagram of the three-dimensional structure from another direction;

[0048] 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;

[0049] Figure 7 for Figure 4 A three-dimensional structural diagram with some components omitted.

[0050] Figure 8 for Figure 4 A three-dimensional structural diagram of the mounting platform and movable clamping module;

[0051] Figure 9 This is a three-dimensional structural diagram of the sill beam welding fixture of the present invention, showing the built-in accessories clamped into the sill beam body by means of an auxiliary hand clamping module.

[0052] Figure 10 for Figure 9 A three-dimensional structural diagram of the auxiliary handheld clamping module;

[0053] Figure 11 for Figure 10 A three-dimensional exploded view;

[0054] 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.

[0055] Figure 13 for Figure 9 A longitudinal sectional view. Detailed Implementation

[0056] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0057] The specification and claims of this invention use terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," to describe various exemplary structural parts and elements of the invention. However, these terms are used herein merely for ease of explanation and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this invention can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be considered as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0058] like Figures 1 to 13 The image shows a preferred embodiment of the sill beam welding fixture of the present invention. 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.

[0059] 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.

[0060] The threshold 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 threshold beam body 10 has a first inclined surface 102 that gradually rises from front to back; the top wall of the threshold 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 threshold beam body 10 has two first through holes 103 arranged alternately in the left and right directions and a second through hole 104.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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:

[0079] In the first state, such as Figure 5 As 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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;

[0085] 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.

[0086] 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.

[0087] 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.

[0088] Specifically, in the initial state, the sill beam welding fixture is in the first state, and each clamping module is in the open state;

[0089] The clamping process of the sill beam body 10 is as follows:

[0090] 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.

[0091] The clamping process for external accessory 20 is as follows:

[0092] 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.

[0093] 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.

[0094] The clamping process for built-in accessory 30 is as follows:

[0095] 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.

[0096] 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.

[0097] 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. An auxiliary handheld clamping module for clamping a hollow internally mounted accessory (30) into a hollow internally mounted door sill beam body (10), characterized in that: The side of the built-in accessory (30) has a limiting hole (301); The auxiliary handheld clamping module (6) includes: A positioning rod (61) is used for the built-in fitting (30) to be fitted and can be inserted into the sill beam body (10). The side of the positioning rod (61) has a first mounting groove (611). The limiting boss (62) can be slidably installed in the first mounting groove (611). When the built-in accessory (30) is in place on 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. A drive component (63) is used to drive the limiting boss (62) to slide; A limiting block (64), installed at the end of the positioning rod (61), has a stepped portion (641) for abutting against the end face of the sill beam body (10); and The first fastener (651) is used to connect the positioning rod (61) and the sill beam body (10) so that the built-in fitting (30) is clamped between the positioning rod (61) and the sill beam body (10), thereby making the outer side wall of the built-in fitting (30) fit tightly against the inner side wall of the sill beam body (10). The end of the positioning rod (61) has a second mounting groove (612) that communicates with the first mounting groove (611); 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 the first mounting groove (611) and the second mounting groove (612). The drive component (63) includes: An operating lever (631) is slidably inserted into the second mounting slot (612), with the head of the operating lever (631) protruding from the end of the positioning rod (61); A guide post (632) is slidably mounted in the guide groove (621) and connected to the operating lever (631); and An elastic element (633) acts between the operating lever (631) and the positioning lever (61) so that the operating lever (631) always has a tendency to move outward; When no external force is applied to the operating rod (631), 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 lever (631) is pressed inward by an external force, the guide post (632) can move inward with the operating lever (631) to the second end of the guide groove (621), so that the head of the limiting boss (62) is in a retracted state. The elastic element (633) is a compression spring and is housed in the second mounting groove (612). The two ends of the compression spring abut against the tail of the operating lever (631) and the end face inside the second mounting groove (612), respectively. It also includes a second fastener (652) for connecting the limiting boss (62) and the sill beam body (10); The side of the threshold beam body (10) has a second through hole (104), and the head of the limiting boss (62) has a second screw hole (622) corresponding to the second through hole (104). The second fastener (652) is a bolt, the shank of which 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).

2. The auxiliary handheld clamping module according to claim 1, characterized in that: The number of the first fasteners (651) is at least two, and they are arranged at intervals along the length direction of the threshold beam body (10).

3. The auxiliary handheld clamping module according to claim 1, characterized in that: The side of the threshold beam body (10) has a first through hole (103), the side of the built-in accessory (30) has a clearance hole (302) corresponding to the first through hole (103), and the side of the positioning rod (61) has a first screw hole (613) corresponding to the first through hole (103). The first fastener (651) is a bolt, the shank of which passes through the first through hole (103) and the relief hole (302) in sequence and is screwed into the first screw hole (613) so that the head of the bolt is pressed tightly against the outside of the sill beam body (10).

4. A door sill beam welding fixture, comprising: Fixed platform (1); The first clamping assembly (2) is disposed on the fixed platform (1) and is used to clamp the threshold beam body (10); Its features are: Includes the auxiliary handheld clamping module (6) as described in any one of claims 1 to 3.

5. The sill beam welding fixture according to claim 4, 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.

6. The sill beam welding fixture according to claim 5, 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.

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