Quick change device for welding fixture

Abstract

The utility model provides a quick-change device for a welding fixture, which comprises a base and quick-change mechanism bodies respectively arranged at two ends of the base, and each quick-change mechanism body comprises a positioning component movably arranged in a first direction and a locking component movably arranged in a second direction; the positioning assembly comprises a positioning piece, and the positioning piece abuts against the welding clamp to position the welding clamp. The locking assembly comprises a locking block, the locking block is arranged on the positioning piece in a sleeving mode, a first via hole and a second via hole which are communicated with each other are formed in the locking block in the second direction, the positioning piece can penetrate through the first via hole in the first direction, and the locking block moves in the second direction so that the positioning piece can move from the first via hole to the second via hole. And the welding clamp is locked on the quick-change mechanism body. According to the quick-change device for the welding fixture, through cooperation of the positioning assembly and the locking assembly, the risks of missing welding of parts after sinking and collision of a production robot are avoided, the welding quality is guaranteed, and the performance of the whole vehicle is improved.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle manufacturing, and in particular to a quick-change device for a welding fixture. Background Art

[0002] The body structural parts of vehicles are usually welded. In order to reduce the investment in welding production lines and realize flexible production, the fixture structure needs to be designed as a quick-change mechanism. In this way, different fixtures can be switched at the same workstation during the production process to produce different products.

[0003] The fixture quick-change mechanism usually includes a positioning device for positioning the fixture. However, in a conventional fixture quick-change mechanism, due to factors such as the positioning device and the structure of the fixture itself, the fixture may sink and deviate, which may have an adverse effect on the product and welding during production. In addition, since the fixture itself is heavy and the positioning part of the quick-change mechanism bears a large weight, the fixture may sink after positioning, causing fluctuations in its positioning position, which may have an adverse effect on the welding process, reduce the welding quality, and further affect the performance of the entire vehicle.

[0004] Therefore, it is necessary to design a quick-change device for welding fixtures to solve the above problems. Utility Model Content

[0005] In view of this, in order to overcome the defects of the prior art, the utility model provides a quick-change device for welding fixtures, which effectively solves the problem that the existing fixture quick-change mechanism will cause the fixture to sink and shift due to its own defects, and the positioning position will fluctuate, thus affecting the welding process.

[0006] According to a quick-change device for a welding fixture provided by the utility model, the quick-change device for the welding fixture comprises a base and a quick-change mechanism body respectively arranged at two ends of the base, the quick-change mechanism body comprises a positioning component movably arranged in a first direction and a locking component movably arranged in a second direction; the positioning component comprises a positioning piece, the positioning piece abuts against the welding fixture to position the welding fixture; the locking assembly comprises a locking block, the locking block is sleeved on the positioning piece, the locking block is provided with a first through hole and a second through hole connected to each other in the second direction, the positioning piece can penetrate the first through hole in the first direction, the locking block moves in the second direction so that the positioning piece moves from the first through hole to the second through hole, so that the welding fixture is locked to the quick-change mechanism body.

[0007] Preferably, the size of the first through hole is larger than that of the second through hole; the positioning member includes a positioning pin and an abutment block sleeved on the positioning pin, the positioning pin can pass through the first through hole, the size of the abutment block corresponds to that of the first through hole, and the abutment block abuts against the locking block.

[0008] Preferably, the positioning assembly also includes a first driving member, which drives the positioning pin to pass through the first through hole so that the quick-change device for the welding fixture is in a positioning state; the locking assembly also includes a second driving member, which drives the locking block so that the positioning pin moves from the first through hole to the second through hole, so that the quick-change device for the welding fixture is in a locked state.

[0009] Preferably, the first direction is perpendicular to the second direction, and in the positioning state, the abutment block is located above the locking block.

[0010] Preferably, the quick-change mechanism body further includes a support member, an accommodating space is provided inside the support member, the first driving member is provided in the accommodating space, and the second driving member is provided on the top of the support member.

[0011] Preferably, the positioning components are provided at both ends of the quick-change mechanism body in the second direction, and the locking block is provided on the upper portion of each positioning component.

[0012] Preferably, the locking assembly also includes a transmission block and a connecting rod, the transmission block drives the locking block through the connecting rod, and the two ends of the connecting rod are respectively connected to a locking block, and the transmission block drives the connecting rod to move in the second direction; the two locking blocks located at the two ends of the connecting rod are the first locking block and the second locking block, and the opening position of the first through hole and the opening position of the second through hole of the first locking block are the same as the opening position of the first through hole and the opening position of the second through hole of the second locking block.

[0013] Preferably, the quick-change mechanism body is arranged at both ends of the base in the third direction; the quick-change device for the welding fixture also includes a guide part and a thrust part, and the guide part and the thrust part are arranged at both ends of the base in the second direction, the guide part is arranged at the end of the quick-change mechanism body, and the welding fixture enters into the quick-change mechanism body through the guide part, and the thrust part is arranged at the upper part of the quick-change mechanism body to limit the welding fixture.

[0014] Preferably, the guide portion comprises a guide block, the guide block is formed with an arc-shaped bending portion, and one guide block is disposed at the end of each of the quick-change mechanism bodies.

[0015] Preferably, the thrust portion includes a connecting beam and a thrust block arranged on the connecting beam, the connecting beam connects the two quick-change mechanism bodies, and a thrust block is arranged on the upper part of each of the quick-change mechanism bodies. The setting height of the thrust block in the first direction is higher than the maximum height to which the positioning member can move in the first direction.

[0016] According to the quick-change device for welding fixtures of the utility model, through the cooperation of the positioning component and the locking component of the quick-change mechanism body, the positioning component can move in the first direction to position the welding fixture, and the locking component can move in the second direction to lock the welding fixture, which solves the sinking and deviation of the welding fixture in the original structure due to its own gravity and external influences, avoids the risk of parts leakage and collision with production robots after sinking, ensures the welding quality in subsequent steps, and improves the performance of the entire vehicle.

[0017] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic structural diagram of a quick-change device for a welding fixture according to an embodiment of the utility model is shown;

[0020] Figure 2 A top view of a quick-change device for a welding fixture according to an embodiment of the utility model is shown;

[0021] Figure 3 A cross-sectional view showing a quick-change device for a welding fixture according to an embodiment of the utility model;

[0022] Figure 4 A partial structural schematic diagram of a quick-change device for a welding fixture according to an embodiment of the utility model is shown;

[0023] Figure 5 Another partial structural schematic diagram of the quick-change device for welding fixture according to an embodiment of the utility model is shown;

[0024] Figure 6 A schematic structural diagram of the cooperation between a quick-change device for a welding fixture and a welding fixture according to an embodiment of the utility model is shown.

[0025] Figure markings: 1-base; 2-quick-change mechanism body; 301-locating pin; 302-abutment block; 401-locking block; 402-first through hole; 403-second through hole; 404-transmission block; 405-connecting rod; 5-first driving member; 6-second driving member; 7-support member; 8-guide part; 801-guide block; 9-thrust part; 901-thrust block; 902-connecting beam; 10-welding fixture; S1-first direction; S2-second direction; S3-third direction. DETAILED DESCRIPTION

[0026] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0027] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0028] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0029] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0030] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0031] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0032] The terms used herein are only used to describe various examples and are not used to limit the examples. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprising" and "having" list the existence of the stated features, quantities, operations, components, elements and / or their combinations, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0033] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0034] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0035] According to the utility model, a quick-change device for a welding fixture is provided. Figures 1 to 6 As shown, the quick-change device for welding fixture is used for a welding fixture of a vehicle, and the quick-change device for welding fixture includes a base 1 and a quick-change mechanism body 2 .

[0036] In the following description, reference will be made to Figures 1 to 6 The detailed structure of the base 1 and the quick-change mechanism body 2 of the quick-change device for the welding fixture is specifically described. In addition, in the description of the embodiment, three directions are also involved, namely the first direction S1, the second direction S2 and the third direction S3. Figure 1 and Figure 3 As shown, the first direction S1 can be understood as a direction extending from the bottom to the top of the quick-change device for the welding fixture, and can also be understood as Figure 3 The second direction S2 can be understood as the direction from the right side to the left side of the quick-change device for the welding fixture, and can also be understood as Figure 2 The third direction S3 can be understood as the direction from the front end to the rear end of the quick-change device for the welding fixture, and can also be understood as Figure 2 The first direction S1, the second direction S2 and the third direction S3 are perpendicular to each other. In addition, it is necessary to explain that, for the convenience of description and observation, Figure 6 As shown, only a partial structure of the welding fixture 10 is shown. In addition, the welding fixture 10 is a component in the prior art, and those skilled in the art can know it. They can also know the matching method between the welding fixture 10 and the quick-change device for the welding fixture.

[0037] like Figures 1 to 4 As shown, in the embodiment, the base 1 can be formed into a rectangular plate structure, and the rectangular plate structure is provided with a plurality of connection holes, through which the quick-change device for welding fixtures can be installed at a designated workstation or connected with other devices, and the connection method can be, for example, using connection bolts, thereby improving the versatility and flexibility of the quick-change device for welding fixtures as a whole. In addition, the base 1, as the bottom structure of the quick-change device for welding fixtures, can carry the quick-change mechanism body 2 and the welding fixture 10, and play a bearing role.

[0038] The quick-change mechanism body 2 is arranged at both ends of the base 1, specifically, at both ends in the third direction S3, that is, the quick-change mechanism body 2 is arranged on the left and right sides of the quick-change device for the welding fixture, and a gap is arranged between the two quick-change mechanism bodies 2, which is used to accommodate the welding fixture 10 (such as Figure 6 shown).

[0039] like Figures 1 to 4As shown, in an embodiment, the quick-change mechanism body 2 may include a positioning component movably arranged in a first direction S1 and a locking component movably arranged in a second direction S2, and the positioning component can position the welding fixture 10, and the positioning method is rough positioning before the positioning component moves and precise positioning after the movement; the locking component can lock the welding fixture 10 after it is precisely positioned, to ensure that the welding fixture 10 will not sink or deflect, and will not cause the positioning position to fluctuate, thereby avoiding adverse effects on the welding process.

[0040] Specifically, the positioning assembly includes a positioning member, which can abut against the welding fixture 10 to position the welding fixture 10. The locking assembly includes a locking block 401, which is sleeved on the positioning member. After the positioning member and the welding fixture 10 are positioned, the locking block 401 can lock the positioning member to prevent the positioning member from moving.

[0041] Preferably, if Figure 4 and Figure 5 As shown, in the embodiment, the locking block 401 is provided with a first through hole 402 and a second through hole 403 that are connected to each other in the second direction S2, and the positioning member can penetrate the first through hole 402 in the first direction S1, and the locking block 401 moves in the second direction S2 so that the positioning member moves from the first through hole 402 to the second through hole 403, so that the welding fixture 10 is locked to the quick-change mechanism body 2. In this way, after the welding fixture 10 moves to the quick-change device for the welding fixture, it is first roughly positioned and placed on the positioning member, and then the positioning member moves in the first direction S1 to accurately position the roughly positioned welding fixture 10 on the positioning member, and then the locking block 401 moves so that the positioning member moves from the first through hole 402 to the second through hole 403, and the locking block 401 locks and fixes the positioning member in position, that is, locks it, to prevent the welding fixture 10 from sinking and deflecting due to factors such as gravity and external forces, and to prevent the risk of parts leaking and collision of the production process robot after sinking and deflecting.

[0042] Preferably, if Figure 1 , Figure 3 and Figure 5 As shown, in the embodiment, the positioning member may include a positioning pin 301 and an abutment block 302, and the abutment block 302 is sleeved on the positioning pin 301. The positioning pin 301 may be formed as a cylindrical structural member, and the abutment block 302 may be formed as a circular ring structural member. Both ends of the positioning pin 301 formed as a cylindrical structure extend out to form a circular ring structure abutment block 302, and one end of the two ends of the positioning pin 301 is connected to the first driving member 5 described below, and the other end abuts against the welding fixture 10. The positioning pin 301 can be penetrated by a first through hole 402, and the size of the abutment block 302 corresponds to the first through hole 402.

[0043] The size of the first through hole 402 is larger than that of the second through hole 403. The size of the first through hole 402 needs to allow the positioning member to pass through, that is, the size of the abutment block 302 corresponds to the first through hole 402, so that the positioning member can move in the first direction S1. The size of the second through hole 403 needs to be able to clamp and lock the positioning member, so the size needs to be smaller than the positioning member. In addition, the size here refers to that the positioning pin 301 is formed into a cylindrical structure, the abutment block 302 is formed into a circular ring structure, the diameter of the cylindrical structure and the outer diameter of the circular ring structure are the size here, and the first through hole 402 and the second through hole 403 can both be formed into circular holes, and the diameter of the circular hole is the size here.

[0044] Preferably, if Figure 3 As shown, in the embodiment, the positioning assembly may further include a first driving member 5, the first driving member 5 drives the positioning pin 301 to penetrate the first through hole 402 so that the welding fixture quick-change device is in a positioning state; the locking assembly may further include a second driving member 6, the second driving member 6 drives the locking block 401 to move the positioning pin 301 from the first through hole 402 to the second through hole 403, so that the welding fixture quick-change device is in a locked state (such as Figure 6 As shown, the quick-change device for the welding fixture is in a locked state). Preferably, in the embodiment, the first driving member 5 and the second driving member 6 can both be cylinders, and the cylinder can be a component in the prior art, and its structure is known to those skilled in the art, and will not be repeated here. The positioning pin 301 can be connected to the telescopic rod of the first driving member 5, such as a cylinder, and the locking block 401 can be connected to the telescopic rod of the second driving member 6, such as a cylinder, and the connection method can be connected using connecting screws.

[0045] Preferably, if Figure 1 As shown, in the embodiment, in the positioning state, the abutment block 302 is located on the upper part of the locking block 401. Since the size of the second through hole 403 is smaller than the abutment block 302, in order to prevent the welding fixture 10 from sinking, the abutment block 302 is clamped on the upper part of the locking block 401, and the problem of the welding fixture 10 sinking is solved through the clamping structure.

[0046] Preferably, if Figure 2 and Figure 3As shown, in the embodiment, the quick-change mechanism body 2 may further include a support member 7, the support member 7 is provided with an accommodation space inside, the first driving member 5 is located in the accommodation space, and the second driving member 6 is arranged on the top of the support member 7. The support member 7 may be formed into a substantially rectangular parallelepiped structure, the interior of the rectangular parallelepiped structure is hollow, and is used to accommodate the first driving member 5. The first driving member 5 formed as a cylinder is vertically arranged inside the support member 7, so that the telescopic rod of the cylinder can move in the first direction S1. The second driving member 6 formed as a cylinder is arranged on the top of the support member 7, so that the telescopic rod of the cylinder can move in the second direction S2.

[0047] Preferably, if Figures 1 to 6 As shown, in the embodiment, both ends of the quick-change mechanism body 2 in the second direction S2 are provided with positioning components, and the upper part of each positioning component is provided with a locking block 401. Thus, in fact, in the embodiment, there are four positioning components and four locking blocks 401, which can position and lock the four corners of the welding fixture 10.

[0048] Preferably, if Figures 1 to 6 As shown, in the embodiment, in order to enable the two locking blocks 401 located on the same quick-change mechanism body 2 to be linked, the locking assembly may further include a transmission block 404 and a linkage rod 405, wherein the transmission block 404 drives the locking block 401 through the linkage rod 405, and the two ends of the linkage rod 405 are respectively connected with a locking block 401, and the transmission block 404 drives the linkage rod 405 to move in the second direction S2. The telescopic rod of the second driving member 6 is connected to the transmission block 404, and a groove structure is formed on the top of the transmission block 404, and the middle position of the linkage rod 405 is stuck in the groove structure, and the two ends of the linkage rod 405 are respectively connected with a locking block 401, so that the second driving member 6 can drive the linkage rod 405 to move in the second direction S2 through the transmission block 404, so as to realize the movement of the two locking blocks 401 and lock the positioning member.

[0049] Preferably, if Figure 4 and Figure 5 As shown, in the embodiment, the two locking blocks 401 located at both ends of the linkage rod 405 are the first locking block and the second locking block, and the opening position of the first through hole 402 and the opening position of the second through hole 403 of the first locking block are the same as the opening position of the first through hole 402 and the opening position of the second through hole 403 of the second locking block. The same position means that the first through hole 402 of the first locking block is set on one side of the second through hole 403, and the first through hole 402 of the second locking block is also set on the same side of the second through hole 403. In the embodiment, one side of the second through hole 403 can be the side of the second through hole 403 extending in the opposite direction of the second direction S2. Such a setting can make the first locking block and the second locking block lock or unlock at the same time, improve the linkage, and further improve the locking performance of the locking assembly.

[0050] Preferably, if Figure 2 As shown, in the embodiment, the quick-change mechanism body 2 is arranged at both ends of the base 1 in the third direction S3, that is, the quick-change device for the welding fixture includes two quick-change mechanism bodies 2, which can position and lock both ends of the welding fixture 10.

[0051] Preferably, if Figure 1 , Figure 2 and Figure 4 As shown, in the embodiment, the quick-change device for welding fixtures may further include a guide portion 8 and a thrust portion 9, which are arranged at both ends of the base 1 in the second direction S2. The guide portion 8 is arranged at the end of the quick-change mechanism body 2, and the welding fixture 10 enters the quick-change mechanism body 2 through the guide portion 8. The thrust portion 9 is arranged at the upper part of the quick-change mechanism body 2 to limit the welding fixture 10.

[0052] Preferably, if Figure 1 , Figure 2 and Figure 4 As shown, in an embodiment, the guide portion 8 may include a guide block 801, which is formed with an arc-shaped bending portion. A guide block 801 is provided at the end of each quick-change mechanism body 2, and the two guide blocks 801 are bent in directions away from each other, so that the welding fixture 10 can be guided into the gap between the two quick-change mechanism bodies 2 mentioned above, and the preliminary positioning of the welding fixture 10 can be achieved, which is convenient for the next step of operation.

[0053] Preferably, if Figure 1 , Figure 2 and Figure 4 As shown, in the embodiment, the thrust portion 9 may include a thrust block 901 and a connecting beam 902, the connecting beam 902 connects the two quick-change mechanism bodies 2 and is fixed to the two quick-change mechanism bodies 2, and the thrust block 901 is arranged on the connecting beam 902 and corresponds to the two quick-change mechanism bodies 2. In this way, a thrust block 901 is arranged on the upper part of each quick-change mechanism body 2. The thrust block 901 and the connecting beam 902 can limit the welding fixture 10 that enters the interval from the guide portion 8. The setting height of the thrust block 901 in the first direction S1 is higher than the maximum height that the positioning member can move in the first direction S1, and the setting height of the thrust block 901 can avoid interference with the positioning member.

[0054] The use process of the quick-change device for welding fixtures is as follows: first, the welding fixture 10 enters the gap between the two quick-change mechanism bodies 2 through the guide part 8. At this time, the telescopic rod of the first driving member 5 is retracted, and the positioning member is at a low position in the first direction S1. The welding fixture 10 is roughly positioned on the quick-change mechanism body 2. The rough positioning method can be to make the four corners of the welding fixture 10 correspond to the four positioning components respectively. After the rough positioning is completed, the first driving member 5 drives the positioning member to move along the first direction S1, so that the positioning member extends out of the first through hole 402. The positioning member is at a high position in the first direction S1 and abuts against the four corners of the welding fixture 10. The abutment method can be clamping. The four corners of the welding fixture 10 can be formed with positioning holes or positioning grooves, and the positioning member is clamped in the positioning holes or positioning grooves, so as to achieve precise positioning. After accurate positioning, the second driving member 6 drives the linkage rod 405 to move along the second direction S2, and drives the locking block 401 to move, so that the positioning member located at the first through hole 402 of the locking block 401 moves to the second through hole 403. In this way, the positioning member is fixed because the abutment block 302 is clamped on the upper part of the locking block 401. Since the positioning assembly and the locking assembly are clamped to each other, the welding fixture 10 located on the positioning assembly is also prevented from sinking and deflecting.

[0055] The quick-change device for the welding fixture cooperates with the positioning component and the locking component of the quick-change mechanism body. The positioning component can move in a first direction to position the welding fixture, and the locking component can move in a second direction to lock the welding fixture. This solves the problem of sinking and deviation of the welding fixture in the original structure due to its own gravity and external influences, avoids the risk of welding leaks and collisions with production robots after sinking, ensures the welding quality in subsequent steps, and improves the performance of the entire vehicle.

[0056] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A quick-change device for a welding fixture, characterized in that: The quick-change device for welding fixture comprises a base and a quick-change mechanism body respectively arranged at two ends of the base, wherein the quick-change mechanism body comprises a positioning component movably arranged in a first direction and a locking component movably arranged in a second direction; The positioning assembly includes a positioning piece, which abuts against the welding fixture to position the welding fixture; the locking assembly includes a locking block, which is sleeved on the positioning piece, and the locking block is provided with a first through hole and a second through hole that are connected to each other in the second direction, and the positioning piece can pass through the first through hole in the first direction, and the locking block moves in the second direction to make the positioning piece move from the first through hole to the second through hole, so that the welding fixture is locked to the quick-change mechanism body.

2. The quick-change device for welding fixture according to claim 1, characterized in that: The size of the first via hole is larger than the size of the second via hole; The positioning member includes a positioning pin and a contact block sleeved on the positioning pin, the positioning pin can pass through the first through hole, the size of the contact block corresponds to the first through hole, and the contact block contacts the locking block.

3. The quick-change device for welding fixture according to claim 2, characterized in that: The positioning assembly further includes a first driving member, which drives the positioning pin to pass through the first through hole so that the quick-change device for the welding fixture is in a positioning state; The locking assembly also includes a second driving member, which drives the locking block to move the positioning pin from the first through hole to the second through hole, so that the quick-change device for the welding fixture is in a locked state.

4. The quick-change device for welding fixture according to claim 3, characterized in that: The first direction is perpendicular to the second direction, and in the positioning state, the abutment block is located on an upper portion of the locking block.

5. The quick-change device for welding fixture according to claim 3, characterized in that: The quick-change mechanism body further comprises a support member, an accommodating space is arranged inside the support member, the first driving member is arranged in the accommodating space, and the second driving member is arranged on the top of the support member.

6. The quick-change device for welding fixture according to claim 1, characterized in that: The positioning components are disposed at both ends of the quick-change mechanism body in the second direction, and the locking block is disposed at the upper portion of each positioning component.

7. The quick-change device for welding fixture according to claim 6, characterized in that: The locking assembly further comprises a transmission block and a linkage rod, wherein the transmission block drives the locking block through the linkage rod, and two ends of the linkage rod are respectively connected with a locking block, and the transmission block drives the linkage rod to move in the second direction; The two locking blocks located at both ends of the connecting rod are the first locking block and the second locking block, and the opening position of the first through hole and the opening position of the second through hole of the first locking block are the same as the opening position of the first through hole and the opening position of the second through hole of the second locking block.

8. The quick-change device for welding fixture according to claim 1, characterized in that: The quick-change mechanism body is arranged at two ends of the base in the third direction; The quick-change device for the welding fixture also includes a guide portion and a thrust portion, and the guide portion and the thrust portion are arranged at both ends of the base in the second direction. The guide portion is arranged at the end of the quick-change mechanism body, and the welding fixture enters into the quick-change mechanism body through the guide portion. The thrust portion is arranged at the upper part of the quick-change mechanism body to limit the welding fixture.

9. The quick-change device for welding fixture according to claim 8, characterized in that: The guide portion comprises a guide block, the guide block is formed with an arc-shaped bending portion, and one guide block is arranged at the end of each of the quick-change mechanism bodies.

10. The quick-change device for welding fixture according to claim 8, characterized in that: The thrust portion includes a connecting beam and a thrust block arranged on the connecting beam, the connecting beam connects the two quick-change mechanism bodies, and a thrust block is arranged on the upper part of each of the quick-change mechanism bodies. The setting height of the thrust block in the first direction is higher than the maximum height to which the positioning member can move in the first direction.

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