Automobile door frame guide rail spot welding jig
By designing a detection component for spot welding fixture for automotive door frame guide rails, the movement path of the nut is rotated to the sensing range of the first sensor by using the touch piece, the problems of nut detection errors and sensor damage in the prior art are solved, and the stable detection of small bracket nuts is realized, reducing the chance of door frame repair and scrapping.
Patent Information
- Application Number
- CN202421933358.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-09
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-08-09
AI Technical Summary
When the existing automotive door frame guide spot welding fixture detects whether the nuts on the small bracket exist, there are problems such as misjudgment and sensor damage, and it is impossible to stably detect the sides of the nuts.
A spot welding fixture for automotive door frame rails is designed, and a structure including a first positioning assembly, a second positioning assembly, a third positioning assembly and a detection assembly are adopted. The detection component rotates the movement path of the nut into the sensing range of the first sensor through the touch member to realize stable detection of the nut.
It effectively avoids misjudgment and sensor damage, realizes stable detection of small bracket nuts, and reduces the chance of door frame rework and scrapping.
Smart Images
Figure CN223012269U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of automotive parts processing equipment, and particularly relates to a spot welding fixture for an automotive door frame guide rail. Background Art
[0002] The window glass installed between the automotive door frame and the outer panel needs to be lifted and lowered along a specified trajectory. Therefore, a door frame guide rail is designed on one side of the door frame. The door frame and the outer panel will eventually be welded together. If the tail of the door frame guide rail is welded together, the position of the door frame guide rail will be fixed. However, since the glass lifting requires fine-tuning the position of the guide rail, the tail of the door frame guide rail is designed to be installed on the outer panel with a small bracket and a nut, which can be finely adjusted for disassembly and assembly. Since this nut is inside the small bracket, it is not easy to observe, and the size is small. In production, there are often cases where the nut is missed in welding the small bracket in the incoming materials. Therefore, it is necessary to detect the presence or absence of the nut during the spot welding process of the small bracket on the guide rail to prevent the guide rail bracket without a nut from flowing to the next process and reduce the probability of door frame repair and scrapping.
[0003] On the existing mass production line for the spot welding fixture of the large guide rail bracket, an inductor is usually directly used to detect the nut body. When detecting the front of the nut, there is an error of 2 mm in the detection distance of the inductor, and the nut body is relatively small, so misjudgment often occurs. And the inductor must be inside, too close to the electrode of the spot welder, and it is easy to be damaged. When detecting the side of the nut, the side detection area is small, and since the nut is square, the welding in the previous process only ensures the concentricity of the middle threaded hole, and the positions of the four flange surfaces are random and uncertain. Therefore, the side of the nut cannot be stably detected. Summary of the Utility Model
[0004] The present application aims to solve one of the above technical problems in the prior art. To this end, an embodiment of the present application provides a spot welding fixture for an automotive door frame guide rail, which can stably detect the presence or absence of a nut on a small bracket.
[0005] According to the spot welding fixture for an automotive door frame guide rail provided by the embodiment of the present application, it includes an installation platform, and a first positioning component, a second positioning component, a third positioning component and a detection component are arranged on the installation platform. The first positioning component is used for positioning and limiting the door frame guide rail. The second positioning component is used for supporting the small bracket so that the welding end of the small bracket overlaps the door frame guide rail. The third positioning component is used for positioning the small bracket. The detection component includes a first sensor and a touch member that can rotate. During the process of positioning the small bracket in place, the nut of the small bracket presses against one end of the touch member and causes the touch member to rotate, so that the other end of the touch member moves into the sensing range of the first sensor.
[0006] According to the automotive door frame rail spot welding fixture described in the embodiments of the present application, the touch member is rotatably arranged on the mounting platform through a rotating shaft, and the distance between the triggering end of the touch member for contacting the nut and the rotating shaft is less than the distance between the sensing end of the touch member for triggering the first sensor and the rotating shaft.
[0007] According to the automotive door frame rail spot welding fixture described in the embodiments of the present application, an adjusting member is arranged on the touch member, and the adjusting member is used to adjust the initial position of the triggering end.
[0008] According to the automotive door frame rail spot welding fixture described in the embodiments of the present application, the adjusting member is threadedly connected to the touch member, and the mounting platform is provided with a first stopper for restricting the adjusting member.
[0009] According to the automotive door frame rail spot welding fixture described in the embodiments of the present application, the first positioning assembly includes a first positioning member, a second positioning member, and a third positioning member. The first positioning member is used to support the middle position of the door frame rail, the second positioning member is used to position one end of the door frame rail, and the third positioning member includes a pre-tightening portion capable of rebounding, and the pre-tightening portion is used to press against the other end of the door frame rail.
[0010] According to the automotive door frame rail spot welding fixture described in the embodiments of the present application, the third positioning member includes a column and an elastic portion. The pre-tightening portion is sleeved on the column, and the pre-tightening portion has a tendency to move towards the second positioning member under the action of the elastic portion.
[0011] According to the automotive door frame rail spot welding fixture described in the embodiments of the present application, the pre-tightening portion is annular, the elastic portion is a spring, the spring is arranged inside the pre-tightening portion, and both ends of the spring respectively press against the column and the inner side of the pre-tightening portion, so that the pre-tightening portion has a tendency to move towards the second positioning member.
[0012] According to the automotive door frame rail spot welding fixture described in the embodiments of the present application, the second positioning assembly includes a first cylinder and a profiling member. The first cylinder is used to drive the profiling member to perform linear reciprocating motion, and the profiling member is used to support the inner side of the small bracket.
[0013] According to the automotive door frame rail spot welding fixture described in the embodiments of the present application, the third positioning assembly includes a second cylinder and a positioning pin. When the small bracket is placed on the second positioning assembly, the positioning pin can move to insert into the nut hole of the small bracket under the action of the second cylinder.
[0014] According to the automotive door frame rail spot welding fixture described in the embodiments of the present application, a second sensor for sensing the door frame rail is further arranged on the mounting platform.
[0015] The above-mentioned spot welding fixture for automobile door frame guide rails has at least the following beneficial effects: Before spot welding the door frame guide rails, positioning and fixing are carried out through the spot welding fixture for automobile door frame guide rails of the present application, and incoming material inspection of the small brackets is performed. Specifically, first, the positioning and limitation of the door frame guide rails are realized through the first positioning component, and then the small bracket is placed on the second positioning component so that the welding end of the small bracket overlaps on the door frame guide rail. Then, the third positioning component is used to fully position the small bracket to ensure that the welding end of the small bracket accurately overlaps on the door frame guide rail. Among them, before the third positioning component fully positions the small bracket, the detection component is used to detect the presence or absence of nuts on the small bracket, and the activation of the third positioning component is controlled by the detection component. Specifically, when the small bracket is correctly welded with nuts, during the process of placing the small bracket on the second positioning part, since the touch part is on the movement path of the nut, when the nut of the small bracket slowly moves to the correct position, it will press against one end of the touch part and drive the touch part to rotate by a preset angle, so that the other end of the touch part can move into the sensing range of the first sensor. After the first sensor senses the touch part, it gives a signal to the third positioning component, and the detection component reminds the operator that the small bracket is welded with nuts. The third positioning part acts to position the small bracket, and then spot welding of the door frame guide rail and the small bracket can be carried out; when there is no nut welded on the small bracket, during the correct placement of the small bracket, due to the absence of the nut, the touch part will not be triggered, that is, the third component cannot be activated. At this time, the small bracket is not correctly positioned, and the detection component does not issue a reminder for the operator to perform spot welding. At this time, the operator can know that the small bracket is not welded with nuts, and just replace the small bracket correctly welded with nuts, effectively avoiding the welding of the small bracket without welded nuts with the door frame guide rail, reducing the small brackets with poor welding on the door frame guide rail, and further reducing the repair rate, realizing stable and effective detection of the presence or absence of nuts on the small bracket before spot welding the door frame guide rail and the small bracket.
[0016] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The present application will be further described below in conjunction with the drawings and embodiments;
[0018] Figure 1 is a schematic structural view of the welded completion of the door frame guide rail and the small bracket in the embodiment of the present application Figure 1 ;
[0019] Figure 2 is a schematic structural view of the welded completion of the door frame guide rail and the small bracket in the embodiment of the present application Figure 2 ;
[0020] Figure 3 is a schematic structural view of the spot welding fixture for automobile door frame guide rails in the embodiment of the present applicationFigure 1 ;
[0021] Figure 4 is a schematic structure of the spot welding fixture for the vehicle door frame rail in an embodiment of the present application Figure 2 ;
[0022] Figure 5 is a schematic structure of the spot welding fixture for the vehicle door frame rail in an embodiment of the present application Figure 3 ;
[0023] Figure 6 is Figure 5 a cross-sectional view along the A-A direction in
[0024] Figure 7 is a schematic structure of the spot welding fixture for the vehicle door frame rail in an embodiment of the present application Figure 4 ;
[0025] Figure 8 is Figure 7 a cross-sectional view along the B-B direction in
[0026] Figure 9 is a schematic structure of the spot welding fixture for the vehicle door frame rail in an embodiment of the present application Figure 5 ;
[0027] Figure 10 is a schematic structure of the spot welding fixture for the vehicle door frame rail in an embodiment of the present application Figure 6 ;
[0028] Figure 11 is Figure 10 a cross-sectional view along the C-C direction in
[0029] Reference numerals: door frame rail 110, small bracket 120, nut 121, mounting platform 201, first positioning member 210, second positioning member 220, pre-tightening portion 231, elastic portion 232, first sensor 240, touch member 250, trigger end 251, sensing end 252, adjusting member 253, rotating shaft 254, first stopper 255, second sensor 260, second positioning assembly 300, first cylinder 310, adapter 320, profiling member 330, second stopper 340, third positioning assembly 400, second cylinder 410, guide rod 420, positioning pin 430. Detailed Description of the Embodiment
[0030] This section will describe in detail the specific embodiments of the present application. The preferred embodiments of the present application are shown in the drawings. The function of the drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present application, but it should not be construed as a limitation on the protection scope of the present application.
[0031] In the description of the present application, it should be understood that regarding the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc., is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.
[0032] In the description of the present application, the meaning of "a number of" is one or more, the meaning of "a plurality of" is two or more, and understandings such as "greater than", "less than", "exceeding", etc. do not include the recited number, and understandings such as "above", "below", "within", etc. include the recited number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.
[0033] In the description of the present application, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present application in combination with the specific content of the technical solution.
[0034] Refer to Figure 1 and Figure 2 , a schematic structural diagram of the welding together of the door frame guide rail 110 and the small bracket 120 of an automobile, wherein the small bracket 120 is welded to one end of the door frame guide rail 110, and a nut 121 is welded at the inner position of the small bracket 120, and the nut 121 corresponds to the hole of the small bracket 120.
[0035] To effectively solve the detection problem of the nut 121 of the small bracket 120 before spot welding the small bracket 120 and the door frame guide rail 110, such as Figures 3 to 11As shown in the figure, the spot welding fixture for the automobile door frame guide rail provided by the embodiment of the present application includes an installation platform 201. A first positioning component, a second positioning component 300, a third positioning component 400 and a detection component are arranged on the installation platform 201. The first positioning component is used for positioning and limiting the door frame guide rail 110. The second positioning component 300 is used for supporting the small bracket 120 so that the welding end of the small bracket 120 overlaps the door frame guide rail 110. The third positioning component 400 is used for positioning the small bracket 120. The detection component includes a first sensor 240 and a touch part 250 that can rotate. During the process of positioning the small bracket 120 in place, the nut 121 of the small bracket 120 presses against one end of the touch part 250 and causes the touch part 250 to rotate, so that the other end of the touch part 250 moves into the sensing range of the first sensor 240. When the second positioning component 300 positions and supports the small bracket 120 well, the detection component can timely detect whether the nut 121 of the small bracket 120 is correctly welded. If it is correctly welded, the third positioning component 400 cooperates with the second positioning component 300 to completely position the small bracket 120. On the contrary, if the nut 121 of the small bracket 120 is not welded, the detection component issues a reminder of the missing nut 121 and the third positioning component 400 does not act, ensuring accurate and effective detection of the nut 121 of the small bracket 120 before the small bracket 120 is welded to the door frame guide rail 110.
[0036] Specifically, before spot welding the door frame guide rail 110, positioning and fixing and incoming material inspection of the small bracket 120 are carried out through the spot welding fixture for the automobile door frame guide rail of the present application. Among them, first, the positioning and limitation of the door frame guide rail 110 are realized through the first positioning component. Then, the small bracket 120 is placed on the second positioning component 300 so that the welding end of the small bracket 120 overlaps the door frame guide rail 110. Then, the complete positioning of the small bracket 120 is realized through the third positioning component 400 to ensure that the welding end of the small bracket 120 accurately overlaps the door frame guide rail 110. Next, before the third positioning component 400 completely positions the small bracket 120, the presence or absence of the nut 121 on the small bracket 120 is detected through the detection component, and the start of the third positioning component 400 is controlled by the detection component.
[0037] It should be noted that when the small bracket 120 is correctly welded with the nut 121, during the process of placing the small bracket 120 on the second positioning member 220, since the contact member 250 is on the movement path of the nut 121, when the nut 121 of the small bracket 120 slowly moves to the correct position, it will press against one end of the contact member 250 and drive the contact member 250 to rotate by an angle within a preset range, so that the other end of the contact member 250 can move into the sensing range of the first sensor 240. After the first sensor 240 senses the contact member 250, it gives a signal to the third positioning assembly 400, and the detection assembly reminds the operator that the small bracket 120 is welded with the nut 121. The detection assembly here can be provided with a warning light and a buzzer. When the small bracket 120 is welded with the nut 121, the warning light turns green and the buzzer sounds, and the third positioning member acts to position the small bracket 120, and then spot welding of the door frame guide rail 110 and the small bracket 120 can be carried out; when the small bracket 120 is not welded with the nut 121, during the correct placement of the small bracket 120, due to the absence of the nut 121, the contact member 250 will not be triggered, that is, the third assembly cannot be started. At this time, the small bracket 120 is not correctly positioned, and the detection assembly does not issue a reminder to the operator to carry out spot welding, and the warning light turns red. At this time, the operator can know that the small bracket 120 is not welded with the nut 121, and just replace the small bracket 120 that is correctly welded with the nut 121, effectively avoiding the welding of the small bracket 120 without the welded nut 121 and the door frame guide rail 110, reducing the small brackets 120 with poor welding on the door frame guide rail 110, and further reducing the repair rate, realizing stable and effective detection of the presence or absence of the nut 121 on the small bracket 120 before spot welding of the door frame guide rail 110 and the small bracket 120.
[0038] In this application, the original method of directly detecting the nut 121 by the sensor is optimized to indirectly trigger the induction of the first sensor 240 through the contact member 250 to stably detect the nut 121. Compared with the original direct detection by the sensor, it effectively avoids the interference of the first sensor 240 by the spot welding current and the situation of mis-triggering of the induction of the first sensor 240.
[0039] Among them, such as Figure 3 and Figure 9As shown, the first positioning component includes a first positioning member 210, a second positioning member 220, and a third positioning member. The first positioning member 210, the second positioning member 220, and the third positioning member are arranged according to the direction of the door frame guide rail 110. In the embodiment of the present application, there are two first positioning members 210 in total. The first positioning member 210 is used to support the middle position of the door frame guide rail 110. Specifically, the first positioning member 210 has a card slot for clamping the door frame guide rail 110. The second positioning member 220 is used to position one end of the door frame guide rail 110. A resistance detection limit block is provided on one side of the second positioning member 220 for positioning the door frame guide rail 110. When the end of the door frame guide rail 110 correctly contacts the resistance detection limit block, a relevant signal is given to remind the operator that the door frame guide rail 110 is placed in place. The third positioning member includes a pre-tightening portion 231 that can rebound. The pre-tightening portion 231 is used to press against the other end of the door frame guide rail 110, so that both ends of the positioned door frame guide rail 110 are effectively positioned. Since the pre-tightening portion 231 can rebound, it is relatively convenient to place the door frame guide rail 110, and the resilience of the pre-tightening portion 231 is sufficient to press the door frame guide rail 110 against the second positioning member 220, which is also convenient for subsequent material taking.
[0040] Further, the third positioning member includes a column and an elastic portion 232. The pre-tightening portion 231 is sleeved on the column. Under the action of the elastic portion 232, the pre-tightening portion 231 has a tendency to move towards the second positioning member 220. That is, the pre-tightening force of the pre-tightening portion 231 acting on the door frame guide rail 110 is provided by the elastic portion 232. Among them, the pre-tightening portion 231 is annular, and the elastic portion 232 is a spring. The spring is arranged inside the pre-tightening portion 231, and both ends of the spring respectively press against the column and the inner side of the pre-tightening portion 231, so that the pre-tightening portion 231 has a tendency to move towards the second positioning member 220. To make it more convenient to place the door frame guide rail 110, a guiding fillet or chamfer is provided on the upper side of the surface of the pre-tightening portion 231 for pre-tightening the door frame guide rail 110.
[0041] To ensure the correct placement of the door frame guide rail 110, as Figure 9 shown, a second sensor 260 for sensing the door frame guide rail 110 is further provided on the installation platform 201.
[0042] In some other embodiments, as Figures 4 to 6As shown, the contact member 250 is rotatably arranged on the mounting platform 201 through a rotating shaft 254. The distance between the triggering end 251 of the contact member 250 for contacting the nut 121 and the rotating shaft 254 is less than the distance between the sensing end 252 of the contact member 250 for triggering the first sensor 240 and the rotating shaft 254. Therefore, the sensing end 252 can be made to move away from the sensing range of the first sensor 240 under the action of gravity, avoiding false triggering. Among them, the surface of the triggering end 251 for contacting the nut 121 is an inclined surface. The distance between the triggering end 251 of the contact member 250 for contacting the nut 121 and the rotating shaft 254 is less than the distance between the sensing end 252 of the contact member 250 for triggering the first sensor 240 and the rotating shaft 254. When the triggering end 251 rotates a small distance, the sensing end 252 can rotate a large distance under the principle of leverage, making the sensing more sensitive and effectively avoiding false triggering.
[0043] In some other embodiments, an adjusting member 253 is provided on the contact member 250. The adjusting member 253 is used to adjust the initial position of the triggering end 251. Specifically, the adjusting member 253 is arranged between the rotating shaft 254 and the sensing end 252. By adjusting the length of the adjusting member 253, when it automatically returns to its original position under the action of gravity, it is ensured that the sensing end 252 is always on the movement path of the nut 121. In the embodiment of the present application, the adjusting member 253 is threadedly connected to the contact member 250, so that the length of the adjusting member 253 can be quickly adjusted. The mounting platform 201 is provided with a first stopper 255 for restricting the adjusting member 253. The position of the contact member 250 automatically returning to its original position and flipping is restricted by the first stopper 255 and the adjusting member, that is, it can be ensured that the sensing end 252 is always on the movement path of the nut 121. When the small bracket 120 is welded with the nut 121, it can be correctly triggered and drive the contact member 250 to flip.
[0044] In some other embodiments, such as Figures 9 to 11As shown in the figure, the second positioning component 300 includes a first cylinder 310 and a profiling member 330. The first cylinder 310 is used to drive the profiling member 330 to perform linear reciprocating motion, and the profiling member 330 is used to support the inner side of the small bracket 120. Specifically, due to the setting of the first positioning member 210 for the door frame guide rail 110, the layout of the second positioning component 300 is affected. Therefore, the connection between the profiling member 330 and the first cylinder 310 needs to be carried out through an adapter 320 to avoid interfering with the installation of other components. To enable the profiling member 330 to accurately move to the specified position, a second stop block 340 is provided on the installation platform 201. The second stop block 340 is used to limit and determine the positioning position of the adapter 320, clarify the accurate positioning of the profiling member 330, and play the role of supporting the small bracket 120. Specifically, during use, when the positioning and support of the small bracket 120 are required, the first cylinder 310 retracts to drive the profiling member 330 to be positioned in place; after spot welding is completed, the first cylinder 310 extends to drive the profiling member 330 away from the inner side of the small bracket 120, so as to prevent the profiling member 330 from affecting the material taking of the welded door frame guide rail 110.
[0045] In some other embodiments, such as Figure 7 and Figure 8 As shown in the figure, the third positioning component 400 includes a second cylinder 410 and a positioning pin 430. When the small bracket 120 is placed on the second positioning component 300, the positioning pin 430 can move to insert into the nut 121 hole of the small bracket 120 under the action of the second cylinder 410. The main body part of the small bracket 120 is supported and positioned by the second positioning component 300, and then the complete positioning of the small bracket 120 is realized by the cooperation of the positioning pin 430 and the nut 121 hole. It should be noted that the start of the third positioning component 400 is triggered by a detection component. When the small bracket 120 is welded with a nut 121 and is sensed, the third positioning component 400 starts. When the small bracket 120 is not welded with a nut 121, the third positioning component 400 does not start. Due to the close setting positions of the second positioning component 300 and the third positioning component 400, to avoid mutual interference, the second cylinder 410 needs to be arranged at a position farther from the positioning pin 430. To enable the second cylinder 410 to effectively drive the positioning pin 430, a guide rod 420 capable of linear motion is provided on the installation platform 201. The second cylinder 410 drives the positioning pin 430 to perform telescopic motion through the guide rod 420 to ensure that the positioning pin 430 can accurately insert into the nut 121 hole.
[0046] The above has described the embodiments of the present application in detail with reference to the accompanying drawings. However, the present application is not limited to the above embodiments. Within the knowledge scope of those of ordinary skill in the art in the technical field, various changes can be made without departing from the purpose of the present application.
Claims
1. A spot welding fixture for automobile door frame guide rails, characterized in that: It includes an installation platform, on which a first positioning component, a second positioning component, a third positioning component and a detection component are arranged, the first positioning component is used for positioning and limiting the door frame guide rail, the second positioning component is used for supporting a small bracket so that the welding end of the small bracket overlaps the door frame guide rail, the third positioning component is used for positioning the small bracket, and the detection component includes a first sensor and a rotatable touch member, when the small bracket is positioned in place, the nut of the small bracket presses against one end of the touch member and causes the touch member to rotate, so that the other end of the touch member moves into the sensing range of the first sensor.
2. The automobile door frame guide rail spot welding jig according to claim 1, characterized in that: The touch member is rotatably disposed on the mounting platform via a rotating shaft, and the distance between the trigger end of the touch member for contacting the nut and the rotating shaft is smaller than the distance between the sensing end of the touch member for triggering the first sensor and the rotating shaft.
3. The automobile door frame guide rail spot welding jig according to claim 2, characterized in that: The touch member is provided with an adjusting member, and the adjusting member is used to adjust the initial position of the trigger end.
4. The automobile door frame guide rail spot welding jig according to claim 3, characterized in that: The adjusting member is threadedly connected to the contact member, and the mounting platform is provided with a first stopper for limiting the adjusting member.
5. The automobile door frame guide rail spot welding jig according to claim 1, characterized in that: The first positioning assembly includes a first positioning member, a second positioning member and a third positioning member. The first positioning member is used to support the middle position of the door frame guide rail, the second positioning member is used to position one end of the door frame guide rail, and the third positioning member includes a pre-tightening portion that can rebound, and the pre-tightening portion is used to press against the other end of the door frame guide rail.
6. The automobile door frame guide rail spot welding jig according to claim 5, characterized in that: The third positioning member includes a column and an elastic portion. The pre-tightening portion is sleeved on the column. Under the action of the elastic portion, the pre-tightening portion has a tendency to move toward the second positioning member.
7. The automobile door frame guide rail spot welding jig according to claim 6, characterized in that: The pre-tightening portion is annular, the elastic portion is a spring, the spring is arranged in the pre-tightening portion, and the two ends of the spring are respectively pressed against the column and the inner side of the pre-tightening portion, so that the pre-tightening portion has a tendency to move toward the second positioning member.
8. The automobile door frame guide rail spot welding jig according to claim 1, characterized in that: The second positioning assembly includes a first cylinder and a contour piece, wherein the first cylinder is used to drive the contour piece to perform linear reciprocating motion, and the contour piece is used to support the inner side of the small bracket.
9. The automobile door frame guide rail spot welding jig according to claim 1, characterized in that: The third positioning assembly includes a second cylinder and a positioning pin. When the small bracket is placed on the second positioning assembly, the positioning pin can move to the nut hole inserted into the small bracket under the action of the second cylinder.
10. The automobile door frame guide rail spot welding jig according to claim 1, characterized in that: The installation platform is also provided with a second sensor for sensing the door frame guide rail.