A positioning structure for a vehicle body welding

Abstract

The present application relates to the technical field of carriage processing, in particular to a positioning structure for carriage welding, comprising a side supporting frame, a front supporting frame, a following frame, a first positioning plate, a second positioning plate and a locking assembly. In the present application, the following frame always follows the carriage plate through the clamping and locking of the locking block, so that in the pre-welding process, the lining plate and the frame are tightly attached through the compression and attachment process, improving the welding quality. Secondly, the positioning plate one and the positioning plate two guide the spot welding process, improving the welding precision while simplifying the welding steps and improving the convenience. In the continuous welding process, the following frame is located at the middle position in the front and rear direction of the carriage plate, which can provide the operation reference and the positioning guide reference in the continuous welding process. In summary, the positioning guide function is provided in the welding process, and the lining plate and the frame are tightly attached in the spot welding process, improving the welding quality and improving the overall operation efficiency and convenience.

Description

Technical Field

[0001] This invention relates to the field of carriage processing technology, specifically a positioning structure for carriage welding. Background Technology

[0002] The carriage body is one of the important components of a vehicle, mainly responsible for supporting the spatial structure, carrying cargo, and protecting passenger safety. The carriage body is mainly formed by welding the outer frame and the inner lining. In the process of processing the carriage body, the lining is first surrounded by the outer frame to form a rectangular outline, and then the connection between the frame and the lining is welded to finally obtain the required carriage body.

[0003] Currently, during processing, the two frame panels are first placed in the designated positions and formed into an L-shape. Then, the liner is placed, and finally, the remaining two frame panels are placed. Through manual adjustment and hydraulic pushing, the liner and the frame panels are made to fit tightly, thus completing the positioning process of the frame panels and the liner. Afterward, a person manually holds a welding gun to pre-weld each connection point, that is, to perform spot welding at different connection points. After completing the above process, the carriage panel is clamped and flipped to make the carriage panel vertical. Then, a robotic arm performs comprehensive and continuous welding at the connection points, thus completing the processing process of the carriage panel.

[0004] The following problems exist in the pre-welding process: Before the pre-welding process, the backing plate and the frame need to be manually pressed and positioned by manual adjustment. Secondly, during the pre-welding process, the backing plate and the frame at the welding point need to be manually adjusted to ensure precise fit. The positioning effect of the backing plate and the frame in the whole process mainly relies on manual adjustment. During the welding process, the spot welding positions need to be found and spot welded one by one by manual, so the whole process is cumbersome. Furthermore, in the subsequent continuous welding process, the carriage panel needs to be repositioned and continuous welding is carried out. The overall welding positioning process is inefficient and the operation steps are cumbersome. Summary of the Invention

[0005] Therefore, it is necessary to provide a positioning structure for welding carriages, which aims to solve the problems of the prior art.

[0006] This application provides a positioning structure for welding a car body, including: an operating table, on which two side abutments distributed to the left and right and two front abutments distributed to the front and back are provided, wherein the left side abutments and the rear front abutments are fixedly installed on the operating table.

[0007] The operating table is equipped with a follower frame for positioning the liner and the frame. Locking blocks are slidably installed on both the left and right sides of the follower frame. The frame is locked by the cooperation between the locking blocks and the side abutment. Multiple bonding plates are fixedly installed on the lower end face of the follower frame, which are distributed equidistantly on the left and right and are used to bond the liner.

[0008] The following frame is equipped with a positioning unit, which includes two rows of positioning components symmetrically distributed front and back. Each row of positioning components corresponds to a bonding plate. The positioning components include a positioning plate one and a positioning plate two for positioning the spot welding position.

[0009] The following frame is equipped with a locking component. When the carriage panel needs to be flipped and welded, positioning plate one and positioning plate two are lifted and locked by the locking component.

[0010] The liner is pressed and positioned by the follower frame and the bonding plate. The close-approaching and pressing action of the side abutment frame and the front abutment frame ensures that the welded joint between the liner and the frame is tightly positioned. During the pre-welding process, the spot welding position is positioned by the positioning plate one and the positioning plate two. During the continuous welding process, the lower positioning plate one and the positioning plate two are locked by the locking component and the follower frame is used as a reference to guide the continuous welding.

[0011] According to an advantageous embodiment, the lower left end face of the following frame is provided with a groove for adapting to the protruding section of the liner plate, and a sliding block corresponding to the locking block is slidably arranged on the following frame from left to right. The sliding block passes through the following frame vertically, and the locking block is fixedly arranged on the lower end face of the corresponding sliding block.

[0012] According to an advantageous embodiment, each of the two side abutments has a receiving groove for accommodating the locking block on its opposite surface, and the upper edge of the receiving groove is chamfered.

[0013] According to an advantageous embodiment, two bolts are fixedly disposed on the sliding block, which are symmetrical front to back and have vertical axes. The bolts pass through the follower frame upward and are threaded with nuts for locking the sliding block.

[0014] According to an advantageous embodiment, each of the two opposing surfaces of the positive abutment is provided with a clearance groove with a right-angled trapezoidal cross-section, and the inclined surfaces of the two clearance grooves are far apart from each other.

[0015] According to an advantageous embodiment, the positioning unit further includes a Z-shaped frame, and the upper end face of the follower frame is rotatably provided with a Z-shaped frame corresponding to the positioning component. Positioning plate one is fixedly disposed on the horizontal section of the Z-shaped frame away from the follower frame, and positioning plate two is fixedly disposed on the right end face of positioning plate one.

[0016] The first positioning plate is L-shaped, with its vertical section located below its horizontal section. A clamping block is fixedly installed on the lower end face of the horizontal section on the upper side of the Z-shaped frame. When the clamping block contacts the following frame, the first positioning plate and the second positioning plate are in close contact with the carriage panel.

[0017] According to an advantageous embodiment, the positioning plate one has an oblique guide groove one, and the positioning plate two has a vertical guide groove two, and the upper openings of both the guide groove one and the guide groove two are chamfered.

[0018] When positioning plate one and positioning plate two are attached to the carriage panel, guide groove one and guide groove two both point to the connection between the liner and the frame.

[0019] According to an advantageous embodiment, the positioning unit further includes mounting rods, and a set of mounting rods with vertical axes and corresponding to the Z-shaped frame are fixedly arranged on the upper end face of the follower frame. Each set of mounting rods contains two rods, and the mounting rods are fitted with sliders that slide up and down. The Z-shaped frame is rotatably arranged between the two corresponding sliders.

[0020] A spring sleeved on the mounting rod is fixedly installed between the slider and the follower frame.

[0021] According to an advantageous embodiment, the locking assembly includes a follower rod, and the upper end face of all the horizontal sections on the upper side of the same row of Z-shaped frames is fixedly provided with a follower rod whose axis extends from left to right. The upper end face of the follower frame is fixedly provided with four locking members arranged in a rectangular pattern.

[0022] The locking member has a locking groove on the end face facing the follower rod. The locking groove is L-shaped, with the horizontal section of the locking groove located above the vertical section and extending through to the front side of the locking member.

[0023] According to an advantageous embodiment, a T-shaped snap-fit ​​groove is provided through the left end face of the lower horizontal section of the Z-shaped frame, and the positioning plate is snapped into the corresponding snap-fit ​​groove by a T-shaped snap-fit ​​block.

[0024] In summary, the present invention has the following beneficial effects: In the present invention, the following frame always follows the carriage panel through the clamping and locking of the locking block. Therefore, during the pre-welding process, because the following frame is locked together with the carriage panel, and the pressing and bonding process makes the lining plate and the frame fit tightly together, the welding quality is improved. Secondly, the spot welding process is guided by positioning plate one and positioning plate two, which improves the welding accuracy and simplifies the welding steps, thereby improving convenience. During the continuous welding process, the following frame is located in the middle position in the front-rear direction of the carriage panel, which can provide a working reference and a positioning guide reference during the continuous welding process. In summary, the present invention not only provides a positioning guide function during the welding process, but also ensures that the lining plate and the frame fit tightly together during the spot welding process, thereby improving the welding quality and improving the overall work efficiency and convenience. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1A three-dimensional structural schematic diagram of a positioning structure for welding a carriage is shown according to an embodiment of the present invention.

[0027] Figure 2 A three-dimensional structural diagram of the side support frame, front support frame, frame and liner provided according to an embodiment of the present invention is shown.

[0028] Figure 3 A front view of the following frame, bonding plate, and side support frame provided according to an embodiment of the present invention is shown.

[0029] Figure 4 A partial cross-sectional perspective view of the three-dimensional structure between the following frame, the side abutment frame, and the locking block provided according to an embodiment of the present invention is shown.

[0030] Figure 5 A partial cross-sectional perspective view of the three-dimensional structure between the following frame, positioning plate one, and positioning plate two provided according to an embodiment of the present invention is shown.

[0031] Figure 6 The present invention provides an embodiment of the invention. Figure 5 Enlarged view of point A in the middle.

[0032] Figure 7 A schematic diagram of the following frame, positioning plate one, and positioning plate two provided according to an embodiment of the present invention in a flat position is shown.

[0033] Figure 8 A schematic diagram of the following frame, positioning plate one, and positioning plate two provided according to an embodiment of the present invention in a vertical state is shown.

[0034] Figure 9 A three-dimensional structural diagram of the follower rod and locking member in a vertical state according to an embodiment of the present invention is shown.

[0035] The above-mentioned attached drawings include the following reference numerals: 1. Operating table; 10. Side abutment frame; 11. Front abutment frame; 110. Clearance groove; 2. Follower frame; 20. Locking block; 21. Adhesive plate; 23. Sliding block; 24. Receiving groove; 25. Bolt; 3. Positioning unit; 30. Positioning assembly; 300. Positioning plate one; 301. Positioning plate two; 302. Guide groove one; 303. Guide groove two; 31. Locking assembly; 310. Spring; 311. Follower rod; 312. Locking element; 313. Locking groove; 32. Z-shaped frame; 320. Snap-fit ​​groove; 33. Abutment block; 34. Mounting rod; 35. Slider; 4. Frame; 5. Liner plate. Detailed Implementation

[0036] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0037] like Figure 1 As shown, a positioning structure for welding a car body includes: an operating table 1, on which two side abutments 10 are symmetrically distributed from left to right and two front abutments 11 are symmetrically distributed from front to back. The left side abutment 10 and the rear front abutment 11 are fixedly installed on the operating table 1. The remaining side abutments 10 and the front abutments 11 are driven to move by an external hydraulic cylinder (not shown in the figure). The right side abutment 10 moves from left to right and the front front abutment 11 moves from front to back.

[0038] like Figure 1 , Figure 3 and Figure 4 As shown, the operating table 1 is provided with a following frame 2 for positioning the liner 5 and the frame 4. Locking blocks 20 are slidably provided on both the left and right sides of the following frame 2. The frame 4 is locked by the cooperation between the locking blocks 20 and the side abutment frame 10. Multiple bonding plates 21 are fixedly provided on the lower end surface of the following frame 2, which are distributed equidistantly on the left and right and are used to bond to the liner 5.

[0039] like Figure 1 and Figure 5 As shown, the following frame 2 is provided with a positioning unit 3. The positioning unit 3 includes two rows of positioning components 30 symmetrically distributed front and back. Each row of positioning components 30 corresponds one-to-one with the bonding plate 21. The positioning component 30 includes a positioning plate 300 and a positioning plate 301 for positioning the spot welding position.

[0040] The following frame 2 is equipped with a locking component 31. When the carriage panel needs to be flipped for welding, the positioning plate 1 300 and the positioning plate 2 301 are lifted and locked by the locking component 31 to avoid the continuous welding process.

[0041] During operation, after the four side frames 4 in the carriage panel are placed on the operating table 1, the rear side frame 4 and the left side frame 4 are in contact and form a right angle, and the corresponding two side frames 4 are in contact with the rear front abutment 11 and the left side abutment 10. Then, the liner 5 and the remaining two side frames 4 are placed, and the follower frame 2 is manually installed. By fitting the follower frame 2 to the side frame 4, the fitting plate 21 fits the liner 5, thereby pressing the liner 5 tightly on the operating table 1 and making the liner 5 tightly attached to the rear side frame 4 and the left side frame 4. The external hydraulic cylinder works to move the right side abutment 10 to the left and the front front abutment 11 to the back. Therefore, the four side frames 4 are in close contact and the liner 5 is in contact with the side frames 4. During the above process, the two locking blocks 20 also move to the left and right sides of the carriage panel (which is the carriage panel after the four side frames 4 and the liner 5 are spliced ​​together). Therefore, the follower frame 2 is locked to the carriage panel.

[0042] Secondly, after the above positioning operation, the positioning plate 300 and positioning plate 301 in the positioning component 30 move to the set position. The positioning effect of the positioning plate 300 and positioning plate 301 positions the required spot welding position at the connection between the liner 5 and the frame 4, while ensuring that the liner 5 and the frame 4 are in close contact at the welding point. Therefore, the welding quality and progress are improved, and the spot welding steps in the subsequent pre-welding process are facilitated, thus improving the convenience.

[0043] After the positioning operation via the following frame 2, positioning plate 1 300 and positioning plate 2 301, and after the spot welding step, continuous welding is required at the connection between the liner 5 and the frame 4. At this time, the carriage panel needs to be flipped. After flipping, the positioning plate 1 300 and positioning plate 2 301 located below are locked by the locking component 31 to avoid obstruction and facilitate continuous welding. In addition, during this process, the following frame 2, the upper positioning plate 1 300 and positioning plate 2 301 can all serve as positioning references, which facilitates guiding welding of different bending areas at the connection.

[0044] In summary, during the spot welding and continuous welding processes of the frame 4 and the lining plate 5 in the carriage panel, the welding position at the connection point is positioned and guided to improve the convenience and accuracy of the welding process.

[0045] It should be further noted that when the follower frame 2 is close to the frame and the fitting plate 21 is in contact with the liner 5, both the positioning plate 1 300 and the positioning plate 2 301 move to the set guide position. This matching process is obtained by the operators in the field through multiple tests and is a known feature. It will not be described in detail hereafter.

[0046] like Figure 3 and Figure 4As shown, the lower left end face of the follower frame 2 is provided with a groove to accommodate the protruding section of the liner 5. A sliding block 23 corresponding to the locking block 20 is slidably arranged on the follower frame 2. The sliding block 23 passes through the follower frame 2 vertically. The locking block 20 is fixedly arranged on the lower end face of the corresponding sliding block 23.

[0047] To increase the friction between the locking block 20 and the frame 4 when they are in contact, the opposing surfaces of the two locking blocks 20 are both serrated surfaces.

[0048] like Figure 2 , Figure 3 and Figure 4 As shown, each of the two side abutments 10 has a receiving groove 24 for accommodating the locking block 20 on its opposite surface, and the upper edge of the receiving groove 24 is chamfered.

[0049] like Figure 4 As shown, two bolts 25 are fixedly installed on the sliding block 23, which are symmetrical in front and behind and have vertical axes. The bolts 25 pass through the follower frame 2 upward, and the bolts 25 are threaded with nuts for locking the sliding block 23.

[0050] During operation, after the backing plate 5 is placed in close contact with the left side frame 4, the positions of the sliding block 23 and the locking block 20 are initially adjusted. The following frame 2 is moved downward so that it gradually presses down. The following frame 2 drives the bonding plate 21 to bond with the backing plate 5. At this time, the backing plate 5 is bonded to the rear side and the left side frame 4 and maintains the required set bending shape. It should be noted that during the above process, the left sliding block 23 drives the corresponding locking block 20 to be inserted into the receiving groove 24 in the left side abutment 10, and the right locking block 20 is located between the right side abutment 10 and the right side frame 4.

[0051] Then, the external hydraulic cylinder operates, causing the front and right side frames 4 to move to the set position. At this point, the four side frames 4 form a rectangular frame that wraps around the liner 5. During the movement of the right side frame 4, the receiving groove 24 in the right side abutment 10 gradually engages with the right side locking block 20 and pushes the right side locking block 20 to the left. When the right side abutment 10 moves and presses against the corresponding side frame 4, the right side locking block 20 fits against the side frame 4. Then, the manual or robotic arm tightens all the nuts to lock the sliding block 23. At this point, the two locking blocks 20 are locked, and the follower frame 2 and the side frame 4 are fixed together, which determines the reference for the subsequent welding process.

[0052] like Figure 2 As shown, each of the two opposing surfaces of the positive abutment 11 is provided with a right-angled trapezoidal clearance groove 110, and the inclined surfaces of the two clearance grooves 110 are far apart from each other.

[0053] like Figure 1 and Figure 5As shown, the positioning unit 3 also includes a Z-shaped frame 32. The upper end face of the following frame 2 is rotatably provided with a Z-shaped frame 32 corresponding to the positioning component 30. Positioning plate one 300 is fixedly installed on the horizontal section of the Z-shaped frame 32 away from the following frame 2, and positioning plate two 301 is fixedly installed on the right end face of positioning plate one 300.

[0054] The positioning plate 300 is L-shaped, with its vertical section located below its horizontal section. A clamping block 33 is fixedly installed on the lower end face of the upper horizontal section of the Z-shaped frame 32. When the clamping block 33 contacts the following frame 2, the positioning plate 300 and the positioning plate 301 are in close contact with the carriage panel.

[0055] During the process of the follower frame 2 being lowered to fit the frame 4, the follower frame 2 drives the Z-shaped frame 32 on it to move down synchronously. At this time, the Z-shaped frame 32 is in contact with the abutment block 33 and the follower frame 2, so the Z-shaped frame 32 is placed in a horizontal state. At the same time, the Z-shaped frame 32 drives the positioning plate 1 300 and positioning plate 2 301 on it to move down synchronously. The clearance groove 110 facilitates the vertical section of positioning plate 1 300 to be inserted into the front and rear sides of the carriage plate. Finally, the follower frame 2 presses the carriage plate, and the horizontal section of positioning plate 1 300 and positioning plate 2 301 are both attached to the carriage plate. The vertical section of positioning plate 1 300 is inserted into the front and rear sides of the carriage plate. Therefore, at this time, the follower frame 2 is located in the middle position in the front and rear direction of the carriage plate, completing the reference positioning process.

[0056] like Figure 5 and Figure 6 As shown, the positioning plate 300 has an oblique guide groove 302, and the positioning plate 301 has a vertical guide groove 303. The upper openings of both the guide groove 302 and the guide groove 303 are chamfered.

[0057] When positioning plate 1 300 and positioning plate 2 301 are attached to the carriage panel, guide groove 1 302 and guide groove 2 303 both point to the connection between the liner 5 and the frame 4.

[0058] When the follower frame 2 completes the reference positioning, the positioning plate 1 300 is located directly above the corresponding concave section on the liner 5, and the positioning plate 2 301 is located directly above the corresponding protruding section on the liner 5. Therefore, in the spot welding step of the pre-welding process, the welding process is guided by the guide groove 1 302 and the guide groove 2 303, which makes it convenient for manual welding gun or robotic arm to hold the welding gun and directly weld the connection between the frame 4 and the liner 5. Through the above positioning method, the welding steps are simplified and the welding accuracy is improved.

[0059] During continuous welding, the vertical section of the positioning plate 300 is attached to the frame 4, so that the following frame 2 is located in the middle of the front and rear direction of the carriage plate, and the positioning plate 300 is opposite to the concave section of the liner 5. Therefore, in the continuous welding step after flipping, the position of the following frame 2 and the position of the positioning plate 300 can guide the continuous welding process of different bending areas at the connection.

[0060] like Figure 1 and Figure 5 As shown, the positioning unit 3 also includes mounting rods 34. A set of mounting rods 34 with vertical axes and corresponding to the Z-shaped frame 32 are fixedly installed on the upper end face of the follower frame 2. There are two mounting rods 34 in each set. The mounting rods 34 are fitted with sliders 35 that slide up and down. The Z-shaped frame 32 is rotatably positioned between the two corresponding sliders 35.

[0061] A spring 310, which is sleeved on the mounting rod 34, is fixedly installed between the slider 35 and the follower frame 2.

[0062] like Figure 1 , Figure 7 , Figure 8 and Figure 9 As shown, the locking assembly 31 includes a follower rod 311. The upper end face of the horizontal section of all Z-shaped frames 32 in the same row is fixedly provided with a follower rod 311 extending from left to right. The upper end face of the follower frame 2 is fixedly provided with four rectangular locking members 312.

[0063] The locking member 312 has a locking groove 313 on the end face facing the follower rod 311. Taking the front right locking groove 313 as an example, the front right locking groove 313 is L-shaped. The horizontal section of the locking groove 313 is located above the vertical section and its horizontal section extends to the front of the locking member 312.

[0064] To facilitate the insertion of the follower rod 311 into the locking groove 313, the openings of the horizontal section of the locking groove 313 are all chamfered.

[0065] See Figure 7 During the pre-welding process, the follower frame 2 is placed flat, and the positioning plate 300 is also placed horizontally. In this state, the spring 310 is in a stretched state. The elastic force generated by the stretching deformation of the spring 310 causes the Z-shaped frame 32 to drive the abutment block 33 to press against the follower frame 2 and the positioning plate 300 to press against the frame 4, ensuring the accurate positioning action and avoiding the problem of inaccurate positioning guidance due to the positioning plate 300 not pressing against the frame 4.

[0066] See Figure 8During continuous welding, the carriage panel is first spot-welded and then flipped to a vertical position. In this vertical position, continuous welding is performed at the connection between the underside liner 5 and the frame 4. At this point, the corresponding follower rod 311 is manually pulled. The follower rod 311 causes the Z-shaped frame 32, positioning plate one 300, and positioning plate two 301 to move upwards synchronously. It should be noted that the upward distance of positioning plate one 300 is greater than the length of its vertical section. Therefore, the vertical section of positioning plate one 300 is no longer in contact with the outside of the frame 4, and the spring 310 remains stretched. Then, rotating the follower rod 311 and the Z-shaped frame 32 causes positioning plate one 300 and positioning plate two 301 to flip, and the follower rod 311 gradually enters the locking groove 313. Within the horizontal section, when the following rod 311 enters the vertical section of the locking groove 313, the elastic force generated by the deformation of the spring 310 keeps the following rod 311 locked within the vertical section of the locking groove 313. Therefore, after the following frame 2 rotates synchronously with the carriage panel, the corresponding Z-shaped frame 32, positioning plate one 300, and positioning plate two 301 remain suspended and locked by the locking groove 313 through the above method. This avoids the problem of the lower positioning plate one 300 and positioning plate two 301 interfering with the continuous welding process. At the same time, the upper positioning plate one 300 remains in contact with the carriage panel, and the two locking blocks 20 remain in a clamping state. Therefore, the following frame 2 and the upper positioning plate one 300 and positioning plate two 301 can all serve as a reference for guiding continuous welding.

[0067] like Figure 6 As shown, a T-shaped snap-fit ​​groove 320 is provided through the left end face of the lower horizontal section of the Z-shaped frame 32, and the positioning plate 300 is snapped into the corresponding snap-fit ​​groove 320 by a T-shaped snap-fit ​​block.

[0068] To meet the welding requirements of different lengths of carriage panels, a positioning plate 300 of the corresponding length is selected according to the welding size of the carriage panel. The assembly process of the positioning plate 300 is completed by snapping the snap block into the corresponding snap slot 320. Therefore, during the subsequent process of the following frame 2 fitting the carriage panel, it is ensured that the vertical section of the positioning plate 300 can fit the front or rear side of the frame 4, and finally ensures that the following frame 2 can be located in the middle position in the front-rear direction of the carriage panel after locking.

[0069] It should be further explained that in the existing operation process, during the pre-welding process, the frame 4 and the liner 5 are usually installed manually in sequence, and the frame 4 and the liner 5 are brought into contact by an external hydraulic device. Then, during welding, the welding position is pressed manually to ensure that the area between the liner 5 and the frame 4 to be spot welded is tightly fitted. This process is repeated multiple times to complete the pre-welding process. However, during the continuous welding process, the tooling car body plate needs to be re-clamped and continuous welding is performed. In this technical solution, a following frame 2, a locking block 20, a positioning plate one 300, a positioning plate two 301, and a locking assembly 31 are added. The locking block 20 is used to lock the following frame 2 and the car body plate together, and to ensure that the liner 5 and the frame 4 are tightly fitted. The addition of these components improves welding quality by ensuring proper fit. Furthermore, positioning plates 300 and 301 guide the spot welding process, enhancing welding precision and simplifying steps, thus increasing convenience. Positioning plate 300 positions the following frame 2 at the center of the front-to-back direction of the carriage panel, providing a working reference during continuous welding. All added components are existing conventional parts, and the installation methods are common. Once installed, they can be used long-term. Therefore, compared to the economic benefits of improved welding precision, quality, and ease of welding, the increased cost is negligible. In summary, this technical solution is a specific improvement based entirely on and addressing the deficiencies of existing technology.

[0070] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0071] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0072] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0073] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A positioning structure for a vehicle body welding, characterized by comprising: The utility model relates to a welding device for the welding of the lining plate and the frame of the vehicle compartment, which comprises: an operation table, two left and right distributed side supporting frames and two front and back distributed positive supporting frames are arranged on the operation table, and the left side supporting frame and the back positive supporting frame are fixedly arranged on the operation table; a following frame for positioning the lining plate and the frame is arranged on the operation table, locking blocks are slidably arranged on the left and right sides of the following frame, the frame is locked by the cooperation between the locking blocks and the side supporting frames, and a plurality of abutting plates for abutting the lining plate are fixedly arranged on the lower end face of the following frame and equidistantly distributed left and right; a positioning unit is arranged on the following frame, the positioning unit comprises two rows of front and back symmetrically distributed positioning assemblies, the positioning assemblies in each row correspond to the abutting plates one by one, the positioning assemblies comprise positioning plate one and positioning plate two for positioning the spot welding position, and the positioning plate one and the positioning plate two are lifted and locked by the locking assembly when the vehicle compartment plate needs to be turned over and welded; the lining plate position is pressed and positioned by the following frame and the abutting plate, the lining plate and the frame are tightly positioned between the welding positions of the lining plate and the frame by the close and tight action of the side supporting frames and the positive supporting frames, the spot welding position is positioned by the positioning plate one and the positioning plate two during the pre-welding process, and the lower positioning plate one and the positioning plate two are locked by the locking assembly and guided for continuous welding by taking the following frame as the reference during the continuous welding process. corresponding sliding blocks are slidably arranged on the following frame, the sliding blocks penetrate the following frame from top to bottom, and the locking blocks are fixedly arranged on the lower end face of the corresponding sliding blocks.

2. The positioning structure for a vehicle body welding according to claim 1, characterized in that: opposite surfaces of the two side supporting frames are each provided with an accommodating groove for accommodating the locking block, and the upper edge of the accommodating groove is chamfered.

3. The positioning structure for a vehicle body welding according to claim 1, wherein: two front and back symmetrically arranged and axis vertically arranged bolts are fixedly arranged on the sliding block, the bolts penetrate the following frame from top to bottom, and nuts for locking the sliding block are threadedly arranged on the bolts.

4. The positioning structure for a vehicle body welding according to claim 2, characterized in that: opposite surfaces of the two positive supporting frames are each provided with an avoidance groove with a straight trapezoidal cross section, and the inclined surfaces of the two avoidance grooves are away from each other.

5. The positioning structure for a vehicle body welding according to claim 1, characterized in that: The positioning unit further comprises a Z-shaped frame, the upper end face of the following frame is rotatably provided with a Z-shaped frame corresponding to the positioning assembly, the positioning plate one is fixedly arranged on the horizontal section of the Z-shaped frame away from the following frame, and the positioning plate two is fixedly arranged on the right end face of the positioning plate one.

6. The positioning structure for a vehicle body welding according to claim 1, wherein: The positioning plate one is L-shaped, the vertical section of the positioning plate one is located below the horizontal section, the lower end face of the upper horizontal section of the Z-shaped frame is fixedly provided with a close block, when the close block contacts the following frame, the positioning plate one and the positioning plate two are in abutting contact with the vehicle compartment plate. An inclined guide groove one is formed in the positioning plate one, and a vertical guide groove two is formed in the positioning plate two, and the upper end openings of the guide groove one and the guide groove two are chamfered.

7. The positioning structure for a vehicle body welding according to claim 6, wherein: When the positioning plate one and the positioning plate two are in abutting contact with the vehicle compartment plate, the guide groove one and the guide groove two are directed to the connection between the lining plate and the frame. The positioning unit further comprises mounting rods, a group of axis vertically arranged and corresponding to the Z-shaped frame mounting rods are fixedly arranged on the upper end face of the following frame, the number of mounting rods in each group is two, the mounting rods are sleeved with sliding blocks that slide up and down, and the Z-shaped frame is rotatably arranged between the corresponding two sliding blocks.

8. The positioning structure for a vehicle body welding according to claim 6, wherein: The sliding blocks and the following frame are jointly fixedly provided with springs sleeved on the mounting rods. ​ 9. The positioning structure for a vehicle body welding according to claim 6, wherein: The locking assembly comprises a following rod, the upper end faces of all the Z-shaped frames in the same row are fixedly provided with a following rod with an axis extending from left to right, and the upper end face of the following frame is fixedly provided with four locking pieces arranged in a rectangle; End faces of the locking pieces towards the following rod are all provided with a locking groove, the locking groove is L-shaped, the horizontal section of the locking groove is above the vertical section, and the horizontal section penetrates to the front side of the locking piece; The opening of the horizontal section of the locking groove is all chamfered.

10. The positioning structure for a vehicle body welding according to claim 6, wherein: The left end face of the lower horizontal section of the Z-shaped frame is provided with a T-shaped clamping groove, and the upper positioning plate is clamped and installed into the corresponding clamping groove through a T-shaped clamping block.

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