Frame welding mechanism with positioning

Abstract

The present application relates to the technical field of frame pipe welding, and discloses a frame welding mechanism with positioning, which comprises a base, a double-end pipe, a right-angle pipe, a clamp, an external connecting pipe, a bottom ring, a fixed pipe, an inner sleeve, a sliding block, an outer ring, a sealing ring and a water pipe. When the right-angle pipe is inserted into the inner sleeve under the pressure of the clamp, the sliding block is expanded along the inclined groove and drives the sealing ring to tightly contact the inner wall of the right-angle pipe, water is passed into the pipe after welding to complete cooling and weld joint leakage detection, so that the positioning, sealing and detection processes are continuously completed.

Description

Technical Field

[0001] This invention relates to the field of motorcycle frame tube welding equipment technology, specifically a frame welding mechanism with positioning. Background Technology

[0002] Motorcycle frames are typically formed by welding together multiple bent tubes, straight tubes, and connecting tubes. The relative angles between the tubes and the end positions directly affect the dimensional accuracy of the frame after it is formed. Therefore, before welding, it is usually necessary to support and fix the tubes with the help of bases, positioning seats, clamping clips, or pins.

[0003] Existing frame welding fixtures mainly rely on external clamping and shape positioning, which can limit the shaking or displacement of pipes during the welding process. However, when it is necessary to butt weld right-angle pipes and double-ended pipes, the ends of the right-angle pipes usually still need to be separately equipped with plugs, sealing plugs or external detection structures in order to pass water into the pipe after welding for cooling or leakage detection.

[0004] The aforementioned separate operation presents two specific problems: Firstly, clamping and sealing need to be completed in two steps, and the installation of the seal after the right-angle tube is clamped is easily restricted by the welding space; secondly, if the seal is still subjected to the extrusion pressure of the tube wall or the residual resistance caused by thermal deformation after welding, the operator needs to pry or disassemble it, which affects the continuous welding cycle of a single frame.

[0005] Therefore, it is necessary to provide a frame welding mechanism with positioning that can form an internal expansion seal while the right-angle tube is pressed down and positioned by the clamp, and can also be cooled by water through the same channel after welding and inspect for weld leaks. Summary of the Invention

[0006] The purpose of this invention is to provide a frame welding mechanism with positioning to solve the problems of separation between right-angle tube positioning, inner cavity sealing and post-weld cooling inspection in existing frame tube welding fixtures, which leads to multiple operation steps, sealing reliability affected by space, and inconvenience in disassembly and release.

[0007] To achieve the above objectives, the present invention provides a set of internal expansion positioning and sealing structures around the downward positioning path of the right-angle tube. A double-ended tube and two right-angle tubes are arranged on the base. The clamp is used to press the double-ended tube and the right-angle tube into the predetermined welding position. An outer tube is also fixed on the base. A bottom ring, a fixing tube and an inner sleeve are arranged coaxially on the outside of the outer tube in sequence. When the right-angle tube is pressed by the clamp, it is inserted downward into the inner sleeve.

[0008] An inclined groove is made on the inner wall of the fixed tube, and a vertical groove is made on the outer wall of the fixed tube that communicates with the inclined groove. A slider is slidably installed in the inclined groove. The slider is connected to an outer ring that passes through the vertical groove. An annular groove is made on the outer wall of the outer ring. A sealing ring is installed in the annular groove. A push plate is installed at the lower end of the outer ring. After the right-angle tube is inserted into the inner sleeve and abuts against the push plate, the right-angle tube continues to press down and will drive the outer ring and slider to move along the inclined groove through the push plate, so that the outer ring expands radially outward and pushes the sealing ring to stick to the inner wall of the right-angle tube.

[0009] Through the above coordination, the clamping action of the right-angle tube and the sealing action of the outer side of the inner sleeve occur simultaneously. When the clamp is fixed downwards to fix the right-angle tube, there is no need to install a plug separately. The sealing ring first forms initial contact with the inner wall of the right-angle tube, and then is further squeezed when the slider moves down and expands outwards along the inclined groove. This can form a relatively stable inner seal during water cooling and leak detection after welding.

[0010] Multiple inclined grooves and multiple sliders can be set in the circumferential direction of the fixed tube. The multiple sliders drive multiple outer rings to move. The sealing ring is fitted in the annular groove of the multiple outer rings. The sealing ring is supported and squeezed by the multiple outer rings together, so that the radial force of the sealing ring is more uniform and the sealing deviation caused by single-point pressing is reduced.

[0011] The inner wall of the slider is connected to an elastic plate, the lower end of the elastic plate is connected to a bottom plate, the bottom ring has a bottom groove, the lower end of the bottom plate is connected to a push rod, the push rod extends outward through the bottom groove, the width of the lower end of the bottom plate is greater than the width of the bottom groove, so that the bottom plate can slide along the upper surface of the bottom ring without coming out of the bottom groove, thereby transmitting the external release force to the reset direction of the slider.

[0012] A spring is installed between the slider and the fixed tube. When the right-angle tube presses down on the push plate and causes the slider to move down along the inclined groove, both the spring and the elastic plate are compressed. When the right-angle tube needs to be released, the spring and the elastic plate can work together to push the slider back along the inclined groove, thereby reducing the pressure of the sealing ring on the inner wall of the right-angle tube.

[0013] An inner water pipe is installed inside the outer pipe, and a threaded pipe is installed at the upper end of the water pipe. The threaded pipe is threaded into the inner sleeve. After the right-angle pipe and the double-ended pipe are welded, water can enter the interior of the fitting through the water pipe and the threaded pipe. The water flow can carry away the heat near the weld and can also form observable leakage when there is incomplete penetration or cracks at the weld.

[0014] A push sleeve is coaxially installed at the lower end of the fixed pipe. The push sleeve is pressed against the outside of multiple push rods. After welding and water flow testing are completed, the operator moves the push sleeve down. The push sleeve pushes multiple push rods to retract in the direction of the water pipe axis. The push rods drive the bottom plate to slide on the upper surface of the bottom ring. The elastic plate pushes the slider back as the bottom plate retracts inward. The radial extrusion pressure of the sealing ring decreases accordingly, and the right-angle pipe can be smoothly pulled out from the top of the inner sleeve.

[0015] A limiting sliding relationship is formed between the bottom plate and the bottom groove. The bottom plate cannot be dislodged downward from the bottom groove. Therefore, when the push rod is subjected to the push sleeve, it will not directly pull the slider. Instead, the bottom plate will slide inward first, and then the force direction of the slider will be changed by the deformation and rebound of the elastic plate, so that the external release action matches the guide direction of the inclined groove.

[0016] Two sets of positioning and sealing structures are respectively arranged below the right-angle pipes at both ends of the double-ended pipe. The two inner sleeves can serve as positioning references for the inner side of the lower end of the two right-angle pipes respectively. The two water pipes can respectively supply water to the pipe cavities where the two welds are located, so that the same welding mechanism is suitable for both simultaneous welding at both ends and for single-sided welding and inspection.

[0017] The inner sleeve serves as a guide for the inner side of the right-angle tube during positioning. The fixed tube and bottom ring support the slider, outer ring, push rod, and push sleeve. The outer tube serves as a fixed connector on the base and provides coaxial passage space for the water pipe. This concentrates the positioning, sealing, water flow, and release structures near the same vertical axis, reducing the problem of multiple independent sealing components occupying operating space around the welding area.

[0018] Compared with the prior art, the present invention provides a vehicle frame welding mechanism with positioning, which has the following advantages: This invention directly transforms the downward positioning action of the right-angle tube into the outward expansion action of the slider along the inclined groove. The sealing ring adheres tightly to the inner wall of the right-angle tube while the clamp fixes the tube, eliminating the need to install the sealing plug separately after welding and reducing repeated adjustments between positioning and sealing.

[0019] This invention forms a water passage path through an outer pipe, a water pipe, a threaded pipe, and an inner sleeve. After welding, water can enter the internal space of the right-angle pipe and the double-ended pipe, which can not only cool the area around the weld, but also determine the weld sealing by observing whether there is water leakage at the welding position. This allows cooling and leak detection to share the same structural path.

[0020] The present invention arranges the water supply component inside a fixed external pipe, so that the water supply path does not move with the opening and closing of the clamp, which can reduce the operation of realigning the water pipe position before and after the inspection.

[0021] The push sleeve, push rod, bottom plate and elastic plate of the present invention form an external release path. Even if there is still residual friction between the sealing ring and the right-angle tube after the clamp is released, the slider can be actively driven to retract by moving the push sleeve downward, thereby reducing the resistance when pulling out the right-angle tube.

[0022] The present invention provides positioning and sealing structures corresponding to right-angle tubes at both ends of the double-ended tube. The two right-angle tubes can simultaneously complete the pressing and positioning, internal expansion sealing, post-weld water supply and release disassembly on the same base, which is beneficial to maintain the relative consistency of the two welding positions. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall installation state of the present invention; Figure 2 This is a schematic diagram showing the combined state of the double-ended tube, right-angle tube, and fixed tube of the present invention; Figure 3 This is a three-dimensional schematic diagram of the positioning and sealing structure of the present invention; Figure 4 This is a cross-sectional schematic diagram of the positioning and sealing structure of the present invention; Figure 5 This is a cross-sectional view of the positioning and sealing structure of the present invention from another direction; Figure 6 This is a schematic diagram showing the fit between the fixed tube, inner sleeve, inclined groove, and vertical groove of the present invention; Figure 7 This is a schematic diagram showing the cooperation of the slider, outer ring, elastic plate, bottom plate and push rod of the present invention; Figure 8 This is a schematic diagram illustrating the cooperation of multiple sliders, push sleeves, and push rods in this invention.

[0024] Reference numerals: 1. Base; 2. Double-ended tube; 3. Right-angle tube; 4. Clip; 5. Outer tube; 6. Bottom ring; 7. Fixing tube; 8. Inner sleeve; 9. Inclined groove; 10. Vertical groove; 11. Slider; 12. Outer ring; 13. Annular groove; 14. Sealing ring; 15. Push plate; 16. Elastic plate; 17. Bottom plate; 18. Bottom groove; 19. Push rod; 20. Spring; 21. Water pipe; 22. Threaded pipe; 23. Push sleeve. Detailed Implementation

[0025] like Figures 1 to 8 As shown, this embodiment provides a frame welding mechanism with positioning, which is used to position and weld a double-ended tube 2 to two right-angle tubes 3. The base 1 serves as the bearing foundation for each tube and the positioning sealing structure. The double-ended tube 2 is placed along the middle of the base 1, and the two right-angle tubes 3 are located at both ends of the double-ended tube 2 and correspond to the welding positions at the two ends of the double-ended tube 2. The clamps 4 apply downward clamping force to the double-ended tube 2 and the right-angle tubes 3 respectively, so that the tubes maintain a certain relative position before welding.

[0026] A set of positioning and sealing structures is set on the base 1 for each right-angle tube 3. The positioning and sealing structure includes an outer tube 5 fixed on the base 1, a bottom ring 6 coaxially fixed on the outer wall of the outer tube 5, a fixing tube 7 coaxially installed on the upper end of the bottom ring 6, and an inner sleeve 8 installed on the upper end of the fixing tube 7. Since the outer tube 5, the bottom ring 6, the fixing tube 7 and the inner sleeve 8 are all fixed relative to the base 1, the inner sleeve 8 can be used as the inner positioning reference when the right-angle tube 3 is inserted into the inner sleeve 8.

[0027] The outer diameter of the inner sleeve 8 is matched with the inner diameter of the right-angle tube 3. During the pressing process of the clamp 4, the right-angle tube 3 first moves downward along the outer side of the inner sleeve 8. The inner sleeve 8 restricts the radial sway of the end of the right-angle tube 3. After the right-angle tube 3 continues to move downward, its lower end abuts against the push plate 15. The push plate 15 is located at the lower end of the multiple outer rings 12 and is used to receive the downward pressure transmitted by the right-angle tube 3.

[0028] Multiple inclined grooves 9 are equally spaced around the inner wall of the fixed tube 7, and multiple vertical grooves 10 are opened on the outer wall of the fixed tube 7. Each vertical groove 10 is connected to the corresponding inclined groove 9. A slider 11 is slidably arranged in each inclined groove 9. The outer wall of the slider 11 is connected to the outer ring 12. The outer ring 12 passes through the vertical groove 10 and is located outside the inner sleeve 8. The vertical groove 10 provides clearance space for the outer ring 12 when it moves vertically and expands radially.

[0029] An annular groove 13 is formed on the outer wall of the outer ring 12. The annular grooves 13 of multiple outer rings 12 are used to fit together the sealing ring 14. The sealing ring 14 is made of rubber or other heat-resistant sealing material that can be elastically deformed. The sealing ring 14 can make initial contact with the inner wall of the right-angle tube 3 before it is fully expanded. As the outer ring 12 expands outward, the sealing ring 14 is further squeezed outward and pressed tightly against the inner wall of the right-angle tube 3.

[0030] In the initial state before the right-angle tube 3 is installed, multiple sliders 11 are located at the upper part of the inclined groove 9, the outer ring 12 is located closer to the axis of the inner sleeve 8, the sealing ring 14 is in a natural or slightly pre-tightened state that is not fully compressed, and the push plate 15 is located on the movement path of the lower end of the right-angle tube 3. Therefore, once the right-angle tube 3 is pressed down by the clamp 4, it will first contact the push plate 15 instead of directly impacting the fixed tube 7 or the bottom ring 6.

[0031] When the clamp 4 presses down on the right-angle tube 3, the right-angle tube 3 is first clamped externally and moves down along the inner sleeve 8. After the lower end of the right-angle tube 3 abuts against the push plate 15, it continues to be subjected to the downward pressure of the clamp 4. The push plate 15 transmits this downward pressure to multiple outer rings 12 and sliders 11. When the slider 11 slides down along the inclined groove 9, it moves away from the axis of the inner sleeve 8 in sync because the inclined groove 9 has an inclined direction. As a result, multiple outer rings 12 expand outward and press against the sealing ring 14.

[0032] When the right-angle tube 3 is pressed down into place, the outside of the right-angle tube 3 is fixed by the clamp 4, and the inside of the right-angle tube 3 is sealed by the sealing ring 14. The positioning action and the inner sealing action are completed in the same pressing stroke. The push plate 15 can be triggered by the right-angle tube 3 without a separate drive component, which is suitable for the pipe end position with relatively tight space on the welding fixture.

[0033] The inner wall of the slider 11 is connected to the elastic plate 16, and the lower end of the elastic plate 16 is connected to the bottom plate 17. A bottom groove 18 is opened on the bottom ring 6. A push rod 19 is provided at the lower end of the bottom plate 17. The push rod 19 passes through the bottom groove 18 and extends downward to the bottom ring 6. The width of the lower end of the bottom plate 17 is greater than the groove width of the bottom groove 18, so that the bottom plate 17 can slide against the upper surface of the bottom ring 6 without coming off the bottom groove 18 with the push rod 19.

[0034] A spring 20 is provided between the slider 11 and the fixed tube 7. The spring 20 can be located below the slider 11 and abut against the support position inside the fixed tube 7. When the slider 11 moves downward along the inclined groove 9, the spring 20 is compressed. The elastic plate 16 also bends and stores energy as the relative position of the slider 11 and the bottom plate 17 changes. Together, they provide elastic thrust for the retraction and reset of the slider 11.

[0035] The elastic plate 16 is connected between the slider 11 and the bottom plate 17, so that when the push rod 19 is subjected to external force, it does not have to form a rigid direct pull relationship with the slider 11. The radial displacement generated by the bottom plate 17 sliding along the bottom ring 6 can be converted into an upward and inward tendency of the slider 11 through the elastic plate 16, so as to avoid the slider 11 getting stuck due to the mutual resistance of the inclined groove 9 and the residual friction during release.

[0036] A water pipe 21 is installed inside the outer pipe 5. A threaded pipe 22 is installed at the upper end of the water pipe 21. The threaded pipe 22 is threadedly connected inside the inner sleeve 8. The internal spaces of the water pipe 21, the threaded pipe 22, the inner sleeve 8, the right-angle pipe 3, and the double-ended pipe 2 are connected in sequence. The threaded connection method makes it easy to remove the water pipe 21 or replace the threaded pipe 22 during maintenance, while ensuring a stable axial connection between the water pipe 21 and the inner sleeve 8.

[0037] After the threaded tube 22 is connected to the inner sleeve 8, the water pipe 21 does not need to directly bear the external clamping force when the right-angle tube 3 is pressed down. The downward pressure of the right-angle tube 3 is mainly transmitted to the base 1 by the push plate 15, the outer ring 12, the slider 11, the fixed tube 7, the bottom ring 6 and the outer tube 5. The water pipe 21 mainly undertakes the function of water flow, thus reducing the bending force of the water pipe 21 during repeated clamping.

[0038] Before welding, the operator places the double-ended tube 2 in the middle positioning position of the base 1, aligns the two right-angle tubes 3 with the welding positions at both ends of the double-ended tube 2, and then puts the lower ends of the two right-angle tubes 3 into the corresponding inner sleeves 8. Then, the clamp 4 is pressed down. While the clamp 4 fixes the right-angle tube 3, it pushes the push plate 15 and drives the sealing ring 14 to complete the internal expansion seal.

[0039] After the pipe fittings are positioned and sealed, the operator welds the contact points between the two right-angle pipes 3 and the double-ended pipe 2. During the welding process, the right-angle pipes 3 are positioned by the clamps 4 and the inner sleeve 8. The sealing ring 14 is located on the lower side of the inner wall of the right-angle pipe 3 and is not directly outside the weld seam, thus not obstructing the welding torch or welding tools from moving along the weld seam. Figure 1 Welding is performed in the area shown.

[0040] After welding, water enters the internal space of the inner sleeve 8, right-angle pipe 3, and double-ended pipe 2 through water pipe 21 and threaded pipe 22. After the water flows into the pipe wall near the weld, it can carry away some heat. If there is incomplete penetration, cracks, or obvious pores at the weld, water will seep out from the corresponding welding position. The operator can use this leakage status to judge whether the weld needs to be repaired or reworked.

[0041] During water flow testing, the sealing position between the inner sleeve 8 and the right-angle pipe 3 is located below the weld or on the inner side near the end of the pipe fitting. The water flow mainly flows along the water pipe 21, the threaded pipe 22, the inner sleeve 8, and the inner cavity of the pipe fitting. The sealing ring 14 prevents water from flowing back and leaking out from the insertion gap between the right-angle pipe 3 and the inner sleeve 8, so that the focus of observation is on the welding position between the right-angle pipe 3 and the double-ended pipe 2.

[0042] Since the sealing ring 14 is formed by the synchronous internal expansion when the right-angle tube 3 is fixed by the clamp 4, there is no need to insert the external plug into the end of the right-angle tube 3 before the water flow test. The sealing pressure between the right-angle tube 3 and the inner sleeve 8 comes from the outward expansion displacement generated by the slider 11 along the inclined groove 9. The more stable the clamping force of the clamp 4, the more stable the downward pressing position maintained by the push plate 15, and the more stable the fit of the sealing ring 14 to the inner wall of the right-angle tube 3.

[0043] After welding cooling and leak detection are completed, the operator first releases the clamp 4 from the top of the right-angle tube 3. However, since the sealing ring 14 may still retain friction with the inner wall of the right-angle tube 3, and the heat after welding may cause the fitting and the sealing ring 14 to adhere slightly, if the right-angle tube 3 is pulled upward directly, it will be hindered by the residual sealing force. Therefore, in this embodiment, a push sleeve 23 for active release is provided at the lower end of the fixed tube 7.

[0044] The push sleeve 23 is coaxially positioned at the lower end of the fixed pipe 7 and presses against the outside of multiple push rods 19. When the operator moves the push sleeve 23 downward, the push sleeve 23 pushes the multiple push rods 19 to retract towards the axis of the water pipe 21. The push rods 19 drive the bottom plate 17 to slide inward along the upper surface of the bottom ring 6. The sliding path of the bottom plate 17 is restricted by the bottom groove 18 to prevent the push rods 19 from deflecting during the release process.

[0045] When the bottom plate 17 retracts inward, it causes the elastic plate 16 to change its bending state. The elastic plate 16 exerts an upward and inward pushing force on the slider 11. At the same time, the spring 20 releases the compressed elastic potential energy. Under the combined action of the elastic plate 16 and the spring 20, the slider 11 retracts upward along the inclined groove 9. The outer ring 12 retracts along the axis of the inner sleeve 8 with the slider 11. The squeezing force of the sealing ring 14 on the inner wall of the right-angle tube 3 is reduced accordingly.

[0046] During the release process, the push sleeve 23 acts on multiple push rods 19 simultaneously from the lower end of the fixed tube 7. The multiple push rods 19 drive multiple bottom plates 17 to retract inward synchronously, and the multiple sliders 11 retract along the inclined groove 9 in a basically synchronous manner. The extrusion pressure at each circumferential position of the sealing ring 14 can decrease simultaneously, avoiding uneven wear when the right-angle tube 3 is pulled out because only one side is released first while the other side is still strongly pressed.

[0047] When the compressive force of the sealing ring 14 is reduced, the right-angle tube 3 and the inner sleeve 8 mainly maintain guide contact and are no longer in a strong sealing clamping state. The operator can then lift the right-angle tube 3 upwards to separate it from the inner sleeve 8 and the sealing ring 14. Subsequently, the already welded double-ended tube 2 and the two right-angle tubes 3 assembly can be removed. The positioning and sealing structure remains on the base 1 to await the assembly of the next set of pipe fittings.

[0048] In this embodiment, the inclination angle of the inclined groove 9 can be set according to the inner diameter of the right-angle tube 3, the compression amount of the sealing ring 14 and the downward stroke of the clamp 4. When the inclined groove 9 is too steep, the outward expansion displacement is large but the downward pressure requirement increases. When the inclined groove 9 is too gentle, the outward expansion displacement is small but the movement is more stable. In practical applications, the right-angle tube 3 can complete the effective contact of the sealing ring 14 within a shorter downward stroke after contacting the push plate 15.

[0049] In this embodiment, the slider 11, outer ring 12, elastic plate 16, bottom plate 17 and push rod 19 can be a set of replaceable internal expansion support components. Multiple internal expansion support components are evenly distributed around the fixed tube 7. The number can be three, four or more. When the number increases, the sealing ring 14 is subjected to more uniform force. When the number decreases, the structure is simpler. Neither changes the basic working path of the slider 11 being triggered by the downward pressure of the right-angle tube 3 to expand and seal.

[0050] In this embodiment, the sealing ring 14 can be made of heat-resistant rubber, silicone rubber or other elastic sealing materials according to the welding temperature and water pressure. The annular groove 13 plays an axial limiting role for the sealing ring 14, preventing the sealing ring 14 from axially shifting due to friction with the pipe wall during the insertion or removal of the right-angle tube 3. After the sealing ring 14 is worn, it can be removed and replaced from the annular groove 13 of the multiple outer rings 12.

[0051] In this embodiment, the clamp 4 can be a manual quick clamp, a screw clamp, or a pneumatic clamp, as long as it can apply a downward fixing force to the right-angle tube 3 and keep the right-angle tube 3 from moving significantly upward during welding. The specific driving form of the clamp 4 does not affect the structural relationship of the right-angle tube 3 contacting the push plate 15 and driving the slider 11 to expand outward along the inclined groove 9.

[0052] In this embodiment, the two sets of positioning and sealing structures are arranged corresponding to the two right-angle pipes 3 respectively. The two water pipes 21 can supply water independently or connect to the same external water source under the base 1. In actual testing, water can be supplied to the welding position of one right-angle pipe 3 and double-ended pipe 2 first, or water can be supplied to both sides at the same time. The external connection method of the water supply path can be adjusted according to the production line layout.

[0053] In this embodiment, the base 1 can be configured with a support surface or positioning boundary according to the shape of the double-ended tube 2 and the right-angle tube 3. The clamp 4 is used to provide downward clamping force, and the inner sleeve 8 is used to provide an inner axial reference. When the two are combined, the right-angle tube 3 is simultaneously subjected to external clamping and internal guidance during welding, which reduces the possibility of slight warping of the tube end around the welding position when simply clamped externally.

[0054] The above embodiments are only used to illustrate the structure and working process of the present invention. Without departing from the core cooperative relationship of the right-angle tube 3 pressing down to trigger the slider 11 to expand outward along the inclined groove 9, the sealing ring 14 expanding inward to seal, the water pipe 21 cooling and leak detection, and the push sleeve 23 releasing externally, any equivalent substitution of the size, material, quantity and fixing method of each component should fall within the protection scope of the present invention.

Claims

1. A frame welding mechanism with positioning, comprising a base (1), a double-ended tube (2) disposed on the base (1), two right-angle tubes (3), and a clamp (4) for pressing down and fixing the double-ended tube (2) and the right-angle tubes (3), characterized in that: An outer tube (5) is fixed on the base (1). A bottom ring (6), a fixed tube (7) and an inner sleeve (8) are coaxially arranged on the outer tube (5). An inclined groove (9) is opened on the inner wall of the fixed tube (7). A vertical groove (10) communicating with the inclined groove (9) is opened on the outer wall of the fixed tube (7). A slider (11) is slidably arranged in the inclined groove (9). The slider (11) is connected to an outer ring (12) passing through the vertical groove (10). An annular groove (13) is opened on the outer wall of the outer ring (12). A sealing ring (14) is arranged in the annular groove (13). A push plate (15) is provided at the lower end of the outer ring (12). When the right-angle tube (3) is pressed down by the clamp (4) and inserted into the inner sleeve (8), it abuts against the push plate (15) and drives the slider (11) to expand outward along the inclined groove (9) so that the sealing ring (14) seals the inner wall of the right-angle tube (3). A water pipe (21) communicating with the inner sleeve (8) is provided in the outer tube (5).

2. The vehicle frame welding mechanism with positioning according to claim 1, characterized in that: The double-ended tube (2) is arranged along the middle of the base (1). Two right-angle tubes (3) are located at the two ends of the double-ended tube (2). The ends of the two right-angle tubes (3) correspond to the two welding positions of the double-ended tube (2). A set of outer tube (5), bottom ring (6), fixing tube (7) and inner sleeve (8) are respectively set on the base (1) corresponding to the two right-angle tubes (3).

3. The vehicle frame welding mechanism with positioning according to claim 1, characterized in that: The bottom ring (6) is coaxially fixed to the outer wall of the outer tube (5), the fixing tube (7) is coaxially set at the upper end of the bottom ring (6), the inner sleeve (8) is set at the upper end of the fixing tube (7), and the outer diameter of the inner sleeve (8) is matched with the inner diameter of the right angle tube (3).

4. The vehicle frame welding mechanism with positioning according to claim 1, characterized in that: Multiple inclined grooves (9) are evenly spaced along the circumference on the inner wall of the fixed tube (7), and vertical grooves (10) are opened on the outer wall of the fixed tube (7). The outer ring (12) passes through the vertical groove (10) from the outer wall of the slider (11). When the slider (11) moves down along the inclined groove (9), it drives the outer ring (12) away from the axis of the inner sleeve (8).

5. A vehicle frame welding mechanism with positioning according to claim 1, characterized in that: Each outer ring (12) has an annular groove (13) on its outer wall. The sealing ring (14) is fitted inside the multiple annular grooves (13). The sealing ring (14) is made of rubber. When the multiple outer rings (12) expand outward, they jointly compress the sealing ring (14).

6. A vehicle frame welding mechanism with positioning according to claim 1, characterized in that: The inner wall of the slider (11) is connected to an elastic plate (16), the lower end of the elastic plate (16) is connected to a bottom plate (17), the bottom ring (6) has a bottom groove (18), the lower end of the bottom plate (17) has a push rod (19) that passes through the bottom groove (18), and the width of the lower end of the bottom plate (17) is greater than the groove width of the bottom groove (18).

7. A vehicle frame welding mechanism with positioning according to claim 6, characterized in that: A spring (20) is provided between the slider (11) and the fixed tube (7). When the slider (11) moves down along the inclined groove (9), both the spring (20) and the elastic plate (16) are compressed. The spring (20) is used to provide a reset thrust to the slider (11).

8. A vehicle frame welding mechanism with positioning according to claim 1, characterized in that: The water pipe (21) is fitted inside the outer pipe (5). The upper end of the water pipe (21) is provided with a threaded pipe (22). The threaded pipe (22) is threadedly connected to the inner sleeve (8). The water pipe (21) is connected to the internal space of the right-angle pipe (3) and the double-ended pipe (2) through the threaded pipe (22).

9. A vehicle frame welding mechanism with positioning according to claim 6, characterized in that: A push sleeve (23) is coaxially provided at the lower end of the fixed pipe (7). The push sleeve (23) is pressed on the outside of multiple push rods (19). When the push sleeve (23) moves downward, it can push multiple push rods (19) to retract in the direction of the axis of the water pipe (21).

10. A vehicle frame welding mechanism with positioning according to claim 9, characterized in that: When the push rod (19) retracts towards the axis of the water pipe (21), it drives the bottom plate (17) to slide along the upper end face of the bottom ring (6). The elastic plate (16) pushes the slider (11) upward as the bottom plate (17) retracts inward, causing the slider (11) to retract along the inclined groove (9) and reduce the sealing force of the sealing ring (14) on the inner wall of the right-angle pipe (3).

Images