A bearing sleeve welding tool

Abstract

This invention relates to the field of welding technology. The objective is to provide a welding fixture for bearing sleeves, comprising a fixed shaft, with an upper jaw mechanism and a lower jaw mechanism respectively disposed in the middle and lower sections of the fixed shaft; a lower jaw drive shaft passes through the center of the fixed shaft, the lower end of which extends beyond the fixed shaft and is linked to the lower jaw mechanism to drive its opening and closing; an upper jaw drive sleeve is disposed outside the fixed shaft above the upper jaw mechanism, and is linked to the upper jaw mechanism to drive its opening and closing; a telescopic support arm is disposed in the upper section of the fixed shaft, rotating with the fixed shaft, and a fixing element for mounting a welding torch is disposed at the cantilever end of the telescopic support arm; the upper jaw mechanism consists of two sets of jaws, which are evenly spaced along the circumference of the fixed shaft; the two sets of jaws can alternately open to create positional avoidance for the welding torch. This invention provides stable positioning, allows for alternating avoidance during welding, effectively eliminates interference and reduces welding deformation while ensuring welding quality.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and more specifically to a bearing sleeve welding device. Background Technology

[0002] Large bearing bushings are widely used in heavy machinery, mining equipment, metallurgical equipment and other heavy-duty working conditions. Due to the limitations of the overall size of the equipment and transportation conditions, ultra-large bearing bushings cannot be pre-assembled and welded in the factory. The main components such as the base and frame must be installed in place, and the bearing bushing and the base boss flange structure must be welded and fixed on site.

[0003] Currently, the on-site welding of large bearing bushings generally adopts a centering fixture combined with ring welding. The fixture's fixing claws press against the inner wall of the base and the inside of the bearing bushing respectively, achieving precise centering and positioning of the workpiece before welding. This effectively ensures the coaxiality of the bushing and the base, avoiding welding eccentricity and misalignment problems. It is an indispensable positioning structure for on-site welding of large bushings.

[0004] However, the existing positioning fixtures all have integral fixed claws. During the positioning and support process, the fixed claws always block the inner welding area where the bearing bushing mates with the base. For the double-layer fillet weld reinforcement structure required for heavy-duty equipment, the outer annular weld can be successfully welded by the outer annular welding mechanism, while the inner fillet weld cannot be welded continuously and smoothly at 360° due to the interference of the fixed claws blocking the entire area.

[0005] To avoid the problem of the fixed claw obstructing the weld, the existing process can only abandon the welding of the inner weld seam, or adopt the method of manual segmented spot welding and local repair welding. The former only retains a single weld seam on the outer side, which greatly reduces the flange connection's ability to resist bending moment, vibration, and fretting wear. It cannot be adapted to the heavy-duty load-bearing structure of large bushing cantilever extensions. Long-term operation is prone to failures such as weld seam cracking, bushing loosening, and oscillating wear. The latter manual segmented welding method has problems such as many weld seam splicing marks, uneven forming, dispersed welding heat input, and inconsistent stress. At the same time, manual welding is difficult to match the symmetrical welding process requirements of large parts, which can easily cause welding deformation defects such as flange warping, bushing out-of-roundness, and coaxiality deviation. This seriously reduces the assembly accuracy of large bearing bushings and the stability of equipment operation.

[0006] In summary, existing welding positioning fixtures for large bearing bushings are limited by fixed claw structures, resulting in core defects such as interference in the inner weld seam and the inability to complete the welding of the inner circumferential weld seam. They are unable to meet the high-precision and high-reliability construction requirements of double weld seams and symmetrical segmented welding of large heavy-duty bearing bushings. The industry urgently needs a special welding fixture structure that can achieve support and clearance and complete the welding of the inner circumferential weld seam without interference. Summary of the Invention

[0007] The purpose of this invention is to provide a bearing sleeve welding fixture with a welding avoidance function.

[0008] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows: a bearing sleeve welding fixture, comprising a fixed shaft, wherein an upper claw mechanism and a lower claw mechanism are respectively provided in the middle and lower sections of the fixed shaft; a lower claw drive shaft is inserted through the center of the fixed shaft, and the lower end of the lower claw drive shaft extends beyond the fixed shaft and is linked with the lower claw mechanism to form a drive for opening and closing the lower claw mechanism; an upper claw drive sleeve is provided outside the fixed shaft above the upper claw mechanism, and the upper claw drive sleeve is linked with the upper claw mechanism to form a drive for opening and closing the upper claw mechanism;

[0009] The upper section of the fixed shaft is provided with a telescopic support arm that rotates with the fixed shaft, and the cantilever end of the telescopic support arm is provided with a fixing component for mounting the welding gun.

[0010] The upper claw mechanism consists of two sets of claws, which are evenly spaced along the circumference of a fixed axis; the two sets of claws can be alternately opened to allow the welding gun to avoid each other.

[0011] Preferably, the upper claw mechanism has six claws, and the three claws are divided into groups A and B; the lower claw mechanism has three claws; the claws of the upper claw mechanism and the lower claw mechanism open in opposite directions.

[0012] Preferably, both the upper claw mechanism and the lower claw mechanism include a fixed disk disposed on a fixed shaft, and the surface of the fixed disk has a plurality of hinged lugs evenly distributed in a ring shape corresponding to the number of claws.

[0013] The lower claw drive shaft is threadedly engaged with the fixed shaft, and the lower end of the lower claw drive shaft is connected to the bottom drive block through a rotary joint; the upper claw drive sleeve includes an upper sleeve body and a lower sleeve body that are rotatably engaged through a rotary joint. Both the upper sleeve body and the lower sleeve body are sleeved outside the fixed shaft, and the upper sleeve body is threadedly engaged with the fixed shaft. The lower sleeve body is stepped in shape, with a smaller upper part and a larger lower part. Six vertical, closed guide blind grooves are provided on the side wall of the lower section of the lower sleeve body, and a sliding strip is provided in each guide blind groove.

[0014] The claw body is hinged to the hinged ear plate near one end, and the two sides of the hinged position respectively constitute the main body section and the drive section.

[0015] The driving sections of the six claws of the upper claw mechanism are opposite to the six sliding bars on the lower sleeve, and the downward pressure of the sliding bars on the driving sections creates a driving force to open the claws.

[0016] The driving sections of the three claws of the lower claw mechanism are opposite to the bottom drive block, and the upward pressure of the bottom drive block creates a drive to open the claws.

[0017] The upper claw drive sleeve is also equipped with a shifting component, which can lock or unlock the upper and lower positions of the sliding bars corresponding to the A group claws and the B group claws in the guide blind groove.

[0018] Preferably, the lower end of the lower sleeve is provided with a concave end groove at its center, and the sliding bar is provided with a limiting groove on the side near the lower end. The openings of the limiting grooves on the sliding bars corresponding to the A group claws and the B group claws are opposite each other, and the side wall of the lower sleeve between the two limiting grooves is provided with a bottom groove that connects two guide blind grooves, so that the limiting groove and the bottom groove together form a swing area.

[0019] The shifting assembly includes a shift sleeve disposed in an end slot; three fan-shaped swing blocks are disposed on the circumferential surface of the upper end of the shift sleeve; the cavity of the end slot is connected to the swing area, and the swing blocks extend into the swing area; when the swing blocks are located in the swing slot and bottom slot corresponding to the A group claw, they lock the A group claw and unlock the B group claw; when the swing blocks are located in the swing slot and bottom slot corresponding to the B group claw, they lock the B group claw and unlock the A group claw.

[0020] Preferably, the upper section of the lower sleeve is further fitted with a pressure plate, which is threadedly engaged with the upper section of the lower sleeve. The pressure plate is used to press the sliding strip into the blind groove of the wire to ensure the stability of the sliding strip position.

[0021] Preferably, both the sliding bar and the bottom drive block are provided with bosses on their peripheral surfaces that are opposite to the drive section of the claw body, and the drive is formed by the extrusion of the drive section by the bosses.

[0022] Preferably, the driving section of the claw body includes a sleeve portion and an insertion rod portion that are sleeved together and form a sliding fit, the sleeve portion being connected to the main body section of the claw body; the insertion rod portion of the upper claw mechanism is hinged to the sliding strip on the upper claw driving sleeve; the insertion rod portion of the lower claw mechanism is hinged to the outer side wall of the bottom drive block.

[0023] Preferably, the root end of the telescopic arm is provided with a rotating sleeve, which is sleeved on the fixed shaft to form a rotational engagement with the fixed shaft; the telescopic arm is composed of a fixed arm and a sliding arm that are sleeved together; a locking screw is provided on the side wall of the fixed arm, and the position of the sliding arm is locked by the locking screw; the fixing member is a clamp; two telescopic arms are provided, and the two telescopic arms are symmetrically distributed around the fixed shaft.

[0024] Preferably, the welding torch is a bent welding torch.

[0025] Preferably, a cross lever is provided on the upper end of the lower claw drive shaft, the upper end of the upper claw drive sleeve, the circumferential surface of the pressure plate, and the circumferential surface of the lower end of the shift sleeve.

[0026] Preferably, a reinforcing rib is provided between the fixed disk and the fixed shaft.

[0027] The beneficial effects of this invention are mainly reflected in: stable positioning, alternating avoidance welding, and effective elimination of interference and reduction of welding deformation while ensuring welding quality. Specifically:

[0028] 1. This fixture can independently drive the lower jaw drive shaft and the upper jaw drive sleeve, so that the lower jaw mechanism and the upper jaw mechanism can be opened and closed independently. The actions do not interfere with each other, and the adjustment is flexible and convenient. They can be accurately supported on the inner bottom of the bearing sleeve and the inner wall of the mounting base, and quickly complete the coaxial centering and positioning of the workpiece with good positioning stability.

[0029] 2. The upper section of the fixed shaft can be rotatably assembled with a telescopic support arm, which, together with the fixed sleeve for mounting the welding gun at the end, can drive the welding gun to rotate smoothly around the circumference of the workpiece, smoothly complete the welding operation of the circumferential weld seam on the outside of the bearing sleeve, with a regular welding trajectory and excellent weld seam forming quality.

[0030] 3. The upper claw mechanism adopts a combination structure of two sets of circumferentially spaced claws. The two sets of claws alternately open to achieve alternating support and positioning. During the welding process, there is no need to remove the positioning structure as a whole. One set of claws remains open to maintain the centering accuracy of the workpiece, while the other set of claws retracts to make room for the welding torch. This effectively solves the problem of interference in welding the inner weld seam caused by the full coverage of the traditional one-piece claw.

[0031] 4. The alternating support of the two sets of claws ensures that the positioning reference does not shift during the entire welding process, and can also be used to achieve segmented avoidance welding, which meets the requirements of the symmetrical welding process of bearing sleeves. It can effectively disperse the welding heat input, suppress welding deformation, and greatly improve the welding forming accuracy and overall connection firmness of bearing sleeves.

[0032] 5. The overall structure is simple and compact, and the pure mechanical drive makes it easy to operate. It is suitable for on-site welding of large-size bearing sleeves. At the same time, the alternating avoidance design of the claw body has strong versatility and can meet the integrated welding construction needs of the inner and outer weld seams of bearing sleeves with different inner diameter specifications, making it highly valuable in application. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of the present invention;

[0034] Figure 2 for Figure 1 Enlarged view of section A in the middle;

[0035] Figure 3 This is a schematic diagram of the structure of the present invention in use.

[0036] Figure 4 This is a schematic diagram of the internal structure of the upper claw drive sleeve;

[0037] Figure 5 for Figure 4 BB-direction view of the lower middle casing;

[0038] Figure 6 This is a top view of the gear shift sleeve;

[0039] Figure 7 This is a schematic diagram showing the movement positions of the swing block in three states;

[0040] Figure label:

[0041] 1. Fixed shaft; 2. Upper jaw mechanism; 3. Lower jaw mechanism; 4. Lower jaw drive shaft; 5. Upper jaw drive sleeve; 51. Upper sleeve body; 52. Lower sleeve body; 53. End groove; 54. Bottom groove; 6. Telescopic support arm; 61. Rotating sleeve; 62. Fixed arm; 63. Sliding arm; 64. Locking screw; 7. Fixing component; 8. Jaw body; 83. Main body section; 84. Drive section; 841. Sleeve section; 842. Insert rod section; 9. Fixed plate; 10. Hinge ear plate; 11. Rotary joint; 12. Bottom drive block; 13. Guide blind groove; 14. Sliding bar; 141. Limiting slot; 15. Gear shifting assembly; 151. Gear shifting sleeve; 152. Swinging block; 16. Swinging area; 17. Pressure plate; 19. Elbow welding torch; 20. Cross lever; 21. Reinforcing rib plate. Detailed Implementation

[0042] The following is in conjunction with the appendix Figure 1-7 The specific embodiments of the present invention will be described in further detail below.

[0043] like Figure 1 As shown, the present invention discloses a bearing sleeve welding fixture. The fixture is based on a fixed shaft 1 as the core reference component. The upper claw mechanism 2, the lower claw mechanism 3, various drive components, shifting components and welding auxiliary components are sequentially assembled on the fixed shaft. The overall structure is compact and reasonable, which can realize the alternating avoidance of the claws during welding, while maintaining a stable support effect throughout the process, effectively meeting the use requirements of continuous welding of the bearing sleeve annular weld.

[0044] The entire fixture mainly consists of a fixed shaft 1 forming the overall mounting base. The fixed shaft 1 serves as the mounting carrier for all components and also as the reference center for workpiece centering. An upper jaw mechanism 2 is installed in the middle section of the fixed shaft 1, and a lower jaw mechanism 3 is installed in the lower section. These two supporting structures respectively conform to the inner wall of the bearing sleeve and the inner wall of the mounting base, achieving precise coaxial positioning of the workpiece. A lower jaw drive shaft 4 is installed through the center of the fixed shaft 1. The lower jaw drive shaft 4 is threaded into the fixed shaft 1, with its lower end extending beyond the fixed shaft 1 and forming a linkage with the lower jaw mechanism 3. By rotating the lower jaw drive shaft 4, the operator can smoothly control the lower jaw mechanism 3 to complete its opening and closing actions. An upper jaw drive sleeve 5 is movably fitted on the outside of the fixed shaft 1 above the upper jaw mechanism 2. The upper jaw drive sleeve 5 works in conjunction with the upper jaw mechanism 2, providing a uniform pushing force to the entire upper jaw mechanism 2, ensuring a consistent and balanced opening force.

[0045] Combination Figure 1 and Figure 3 As can be clearly seen, a telescopic support arm 6 is movably installed at the upper end of the fixed shaft 1. The telescopic support arm 6 can rotate freely around the fixed shaft 1. A fixing part 7 is fixedly installed at the outer end of the telescopic support arm 6. The welding torch used for welding can be securely clamped by the fixing part 7, which is generally a clamp. By relying on the circumferential rotation of the telescopic support arm, the welding torch can be moved along a circular trajectory to smoothly complete the welding operation of the entire weld seam. The upper jaw mechanism 2 is equipped with two sets of independently arranged jaw bodies 8. The two sets of jaw bodies 8 are evenly spaced along the circumference of the fixed shaft. The two sets of jaw bodies 8 can retract and make room independently without loosening the overall support structure, thus making room for the welding torch to weld. This completely solves the drawback of traditional tooling jaw bodies being fixed and blocking the weld seam, making it impossible to achieve welding without dead angles.

[0046] The upper jaw mechanism 2 has a total of six jaw bodies 8, which are evenly arranged in two groups. The lower jaw mechanism 3 has three jaw bodies 8. The opening directions of the jaw bodies 8 in the upper jaw mechanism 2 and the lower jaw mechanism 3 are opposite to each other. The bidirectional clamping support method can greatly improve the stability of the workpiece after placement. Both the upper jaw mechanism 2 and the lower jaw mechanism 3 are equipped with a fixed plate 9, which is fixedly sleeved on the outside of the fixed shaft 1. The surface of the fixed plate 9 is evenly arranged with multiple sets of hinged ear plates 10 in a ring according to the distribution position of the jaw bodies 8. The jaw bodies 8 are hinged and installed on the hinged ear plates 10. With the hinge point as the dividing point, one end of the jaw body 8 is the main body section 83 that fits against the inner wall of the workpiece to achieve positioning and support, and the other end is the drive section 84 that receives the external driving force and realizes swing opening and closing.

[0047] The lower end of the lower jaw drive shaft 4 is connected to the bottom drive block 12 via a rotary joint 11. Rotating the lower jaw drive shaft 4 drives the bottom drive block 12 to move up and down. With the help of the bottom drive block 12, the driving section 84 of the jaw body 8 is lifted upward, thus completing the overall opening operation of the lower jaw mechanism. The upper jaw drive sleeve is divided into two parts: an upper sleeve body 51 and a lower sleeve body 52. ​​The upper sleeve body 51 and the lower sleeve body 52 are rotatably connected via a rotary joint 11. The upper sleeve body 51 is threaded to the fixed shaft 1. Rotating the upper sleeve body 51 drives the lower sleeve body 52 to move axially. The lower side wall of the lower section of the lower sleeve body 52 has multiple guide blind grooves 13 with closed lower ends, which are set according to the number of jaw bodies 8, such as 6 grooves. Sliding strips 14 are slidably installed inside the guide blind grooves 13. By relying on the sliding strips 14 to press the driving section 84 of the jaw body 8 downward, the upper jaw mechanism 2 can be driven to complete the overall opening action.

[0048] Combined with appendix Figure 4 The internal structure of the upper claw drive sleeve 5 is clearly visible. This tooling relies on the cooperation of the shifting component 15 and the pressure plate 17 to complete the switching and clearance operation of the two sets of claw bodies 8. The overall control logic is clear and the operation is highly stable. The lower sleeve 52 has an end groove 53 at its lower center, and the sliding bar 14 has a limit slot 141 at its lower end. Figure 7 As shown, the sliding strips 14 of the two sets of claw bodies 8 have openings opposite to each other in the limiting slots 141. The lower sleeve 52 also has a bottom groove 54 on its side wall. The bottom groove 54 connects to two adjacent guide blind grooves 13. The limiting slots 141 and the bottom groove 54 are connected to each other to form a swing area 16.

[0049] The shift assembly 15 includes a shift sleeve 151 installed inside the end slot. A fan-shaped swing block 152 is fixedly installed on the outer periphery of the upper end of the shift sleeve 151, and the swing block extends into the swing area 16. In actual use, the operator rotates the shift sleeve 151, which drives the fan-shaped swing block 152 to engage with the corresponding limiting slot 141, thereby locking the corresponding sliding bar 14. The locked sliding bar 14 cannot slide upward and retract, and the corresponding claw body 8 will always remain in an open supporting state without loosening or retracting.

[0050] like Figure 4As shown, the pressure plate 17 is threaded onto the upper section of the lower sleeve 52 and is a crucial component for achieving precise reset and regular operation of the sliding bar. According to the assembly relationship in the attached diagram, during the repositioning operation, first, the shift sleeve 151 is rotated, and the fan-shaped swing block 152 locks the sliding bar 14 on the side that needs continuous support. Then, the pressure plate 17 is rotated upwards, disengaging it from the upper end of the guide blind groove 13, allowing space for the sliding bar 14 to slide upwards. At this time, the unlocked sliding bar 14 can move upwards along the guide blind groove 13, and the operator can manually move the corresponding claw 8 inwards to complete the repositioning operation. The locked sliding bar 14 cannot move, and the corresponding claw 8 continuously adheres to the workpiece for support, ensuring that the workpiece's positioning position does not shift throughout the entire process.

[0051] After the weld at the corresponding position is completed, tighten the pressure plate 17 downwards. Using the downward pressure of the pressure plate 17, all sliding bars 14 are pressed and pushed back to their initial working positions, thus regulating the running trajectory of all sliding bars 14. Then, with the claw drive sleeve 5 applying a uniform pushing force, both sets of claws 8 can be restored to their preset support positions and support strengths. This unified drive structure design allows both sets of claws 8 to share a single drive control structure. Even after repeated switching and repositioning, they can still accurately reset, effectively avoiding problems such as support position deviation, uneven force, and workpiece shaking that can occur with multiple independent drive structures, ensuring a smooth and orderly welding operation throughout.

[0052] In the opening and closing drive structure of the claw body 8, this tooling is equipped with two parallel transmission structures, which can be flexibly selected and assembled according to the actual working conditions. The first type is a direct extrusion transmission structure, which relies on the bottom drive block 12 and the sliding bar 14 to directly abut against the drive section 84 of the claw body 8, and transmits the opening and closing power through hard extrusion force. The overall structure is simple and sturdy, with high transmission efficiency, and is suitable for use in normal and stable welding conditions.

[0053] The second type is a telescopic hinge transmission structure. The driving section 84 of the claw body 8 is set as a combined telescopic structure, mainly composed of a sleeve part 841 and a rod part 842 that are sleeved together. The two can slide flexibly to adapt to the swing angle. The sleeve part 841 is fixedly connected to the main body section 83 of the claw body 8. The rod part 842 of the upper claw mechanism is hinged to the sliding bar 14, and the rod part 842 of the lower claw mechanism 3 is hinged to the outer wall of the bottom drive block 12. With the cooperation of the telescopic structure and the hinge structure, it can adapt to the change of the swing angle of the claw body 8. The transmission process is flexible and smooth, and it is not easy to get stuck or jammed. It is suitable for complex construction scenarios with varying swing angles.

[0054] like Figure 1As shown, a rotating sleeve 61 is fixedly installed at the base of the telescopic support arm 6, enabling smooth rotation and assembly with the fixed shaft 1. The telescopic support arm 6 is composed of a fixed arm 62 and a sliding arm 63 connected together. A locking screw 64 is installed on the side wall of the fixed arm. After freely adjusting the overall length of the telescopic support arm, tightening the locking screw 64 will lock the position, which can accommodate the welding of bearing sleeves of various specifications and sizes. The fixing component 7 adopts a clamp-type structure, which is convenient to disassemble and assemble, and firmly clamps the workpiece. It can quickly complete the assembly and fixing of the elbow welding torch 19. The elbow-shaped welding torch can easily reach deep into the inside of the workpiece and successfully complete the welding of the hidden inner position. The fixture is equipped with two telescopic support arms 6, which are symmetrically arranged around the fixed shaft 1. Two welding torches can be equipped at the same time for symmetrical welding, effectively dispersing the welding thermal stress and minimizing the welding deformation of the workpiece. Based on this, the telescopic arm 6 can be further improved to adapt to other working conditions. For example, the telescopic arm 6 can be raised and lowered in the vertical direction, and the angle of the fixing member 7 can be adjusted. This structure is relatively simple and will not be described in detail in this invention.

[0055] To facilitate simple manual operation on-site, cross levers 20 can be installed at the upper end of the lower jaw drive shaft 4, the upper end of the upper sleeve 51, the outer side of the pressure plate 17, and the lower end of the shift sleeve 151. No special tools are required; various rotational adjustments can be easily completed using the cross levers 20. A reinforcing rib plate 21 is fixedly installed at the connection point between the fixed plate 9 and the fixed shaft 1, which effectively strengthens the overall structural strength and rigidity, reduces deformation and wear during long-term use, and effectively extends the service life of the overall tooling.

[0056] When using it in the actual field, refer to the attached document. Figure 1 After assembling the entire tooling set, place the tooling set in a suitable position inside the bearing sleeve workpiece. Then, adjust the upper jaw drive sleeve 5 and the lower jaw drive shaft 4 in sequence to drive the upper and lower jaw bodies 8 to open synchronously, tightly fitting against the inner wall of the workpiece (bearing sleeve and base) to achieve precise centering and positioning. Subsequently, securely install the welding torch on the fixing part 7, adjust the telescopic support arm 6 to the appropriate length for use, and lock it in place.

[0057] During the actual welding process, rotate the shift sleeve 151 according to the welding requirements to lock the sliding bar 14 corresponding to the supporting claw body. Then, loosen the pressure plate 17 upwards and retract the other claw body 8 to complete the repositioning. Rotate the telescopic support arm 6 to drive the welding torch to complete the welding of the corresponding area. After welding a single area, tighten the pressure plate 17 to reset the sliding bar 14. Switch the shift sleeve 151 again to lock the position, alternating to complete the welding of all areas. Throughout the entire welding process, one claw body 8 maintains its supporting position, ensuring strong workpiece stability, eliminating structural obstructions during welding, and resulting in excellent weld quality.

[0058] In summary, this invention achieves flexible alternating movement of the claw body through shift locking and pressure plate 17 reset. It is also equipped with two different transmission drive structures to adapt to various working conditions. The overall design adopts a pure mechanical transmission structure, which is robust and durable, simple and convenient to operate, and has high positioning accuracy. It can well meet the actual use needs of high-precision continuous welding of inner and outer circumferential welds of various large bearing sleeves.

Claims

1. A bearing sleeve welding fixture, characterized in that, The device includes a fixed shaft (1), with an upper claw mechanism (2) and a lower claw mechanism (3) respectively provided in the middle and lower sections of the fixed shaft (1); a lower claw drive shaft (4) is provided through the center of the fixed shaft (1), and the lower end of the lower claw drive shaft (4) extends beyond the fixed shaft (1) and is linked with the lower claw mechanism (3) to form a drive for opening and closing the lower claw mechanism (3); an upper claw drive sleeve (5) is provided outside the fixed shaft (1) above the upper claw mechanism (2), and the upper claw drive sleeve (5) is linked with the upper claw mechanism (2) to form a drive for opening and closing the upper claw mechanism (2); The upper section of the fixed shaft (1) is provided with a telescopic support arm (6) that rotates with the fixed shaft (1), and the cantilever end of the telescopic support arm (6) is provided with a fixing part (7) for installing the welding gun. The upper claw mechanism (2) consists of two sets of claw bodies (8), and the two sets of claw bodies (8) are evenly spaced along the circumference of the fixed axis (1); the two sets of claw bodies (8) can be alternately opened to form a position avoidance of the welding gun.

2. The bearing sleeve welding fixture according to claim 1, characterized in that, The upper claw mechanism (2) is provided with six claw bodies (8), and each group of three claw bodies (8) is divided into group A and group B claws; the lower claw mechanism (3) is provided with three claw bodies (8); the claw bodies (8) of the upper claw mechanism (2) and the lower claw mechanism (3) open in opposite directions.

3. The bearing sleeve welding fixture according to claim 2, characterized in that, Both the upper claw mechanism (2) and the lower claw mechanism (3) include a fixed disk (9) set on the fixed shaft (1). The surface of the fixed disk (9) is evenly distributed in a ring with multiple hinged ear plates (10) corresponding to the number of claw bodies (8). The lower claw drive shaft (4) is threadedly engaged with the fixed shaft (1), and the lower end of the lower claw drive shaft (4) is connected to the bottom drive block (12) through a rotary joint (11); the upper claw drive sleeve (5) includes an upper sleeve body (51) and a lower sleeve body (52) that are rotatably engaged through a rotary joint (11). The upper sleeve body (51) and the lower sleeve body (52) are both sleeved outside the fixed shaft (1), and the upper sleeve body (51) is threadedly engaged with the fixed shaft (1). The lower sleeve body (52) is stepped in shape with a smaller upper part and a larger lower part. Six vertical guide blind grooves (13) with closed lower ends are provided on the side wall of the lower section of the lower sleeve body (52), and a sliding strip (14) is provided in each guide blind groove (13). The claw body (8) is hinged to the hinge ear plate (10) near one end, and the two sides of the hinge position respectively form the main body section (83) and the drive section (84). The driving section (84) of the six claw bodies (8) of the upper claw mechanism (2) is opposite to the six sliding bars (14) on the lower sleeve (52), and the downward pressure of the sliding bars (14) on the driving section (84) forms a drive to open the claw bodies (8). The driving section (84) of the three claw bodies (8) of the lower claw mechanism (3) is opposite to the bottom drive block (12), and the upward pressure of the bottom drive block (12) forms a drive to open the claw bodies (8); The upper claw drive sleeve (5) is also provided with a shifting component (15), which can lock or unlock the upper and lower positions of the sliding bars (14) corresponding to the A group claw and the B group claw in the guide blind groove (13).

4. The bearing sleeve welding fixture according to claim 3, characterized in that, The lower sleeve (52) has a concave end groove (53) at its lower center. The sliding bar (14) has a limiting groove (141) on its side near the lower end. The openings of the limiting grooves (141) on the sliding bars (14) corresponding to the A group claw and the B group claw are opposite each other. The side wall of the lower sleeve (52) between the two limiting grooves (141) is provided with a bottom groove (54) that connects the two guide blind grooves (13) so that the limiting groove (141) and the bottom groove (54) together form a swing area (16). The shift assembly (15) includes a shift sleeve (151) disposed in an end groove (53); three fan-shaped swing blocks (152) are disposed on the circumferential surface of the upper end of the shift sleeve (151); the cavity of the end groove (53) is connected to the swing area (16), and the swing blocks (152) extend into the swing area (16); when the swing blocks (152) are located in the swing slot and bottom groove (54) corresponding to the A group claw, they form a lock on the A group claw and an unlock on the B group claw; when the swing blocks (152) are located in the swing slot and bottom groove (54) corresponding to the B group claw, they form a lock on the B group claw and an unlock on the A group claw.

5. The bearing sleeve welding fixture according to claim 4, characterized in that, The upper section of the lower sleeve (52) is also fitted with a pressure plate (17), which is threadedly engaged with the upper section of the lower sleeve (52). The pressure plate (17) is used to press the sliding bar (14) into the wire blind groove to ensure the stability of the position of the sliding bar (14).

6. The bearing sleeve welding fixture according to claim 5, characterized in that, Both the sliding bar (14) and the bottom drive block (12) are provided with protrusions on their circumferential surfaces that are opposite to the drive section (84) of the claw body (8). The drive is formed by the protrusions pressing the drive section (84).

7. The bearing sleeve welding fixture according to claim 5, characterized in that, The driving section (84) of the claw body (8) includes a sleeve part (841) and a rod part (842) that are sleeved together and form a sliding fit. The sleeve part (841) is connected to the main body section (83) of the claw body (8). The rod part (842) of the upper claw mechanism (2) is hinged to the sliding bar (14) on the upper claw drive sleeve (5). The rod part (842) of the lower claw mechanism (3) is hinged to the outer side wall of the bottom drive block (12).

8. The bearing sleeve welding fixture according to claim 1, characterized in that, The telescopic support arm (6) is provided with a rotating sleeve (61) at its root end. The rotating sleeve (61) is sleeved on the fixed shaft (1) to form a rotational fit with the fixed shaft (1). The telescopic support arm (6) is composed of a fixed arm (62) and a sliding arm (63) that are sleeved together. A locking screw (64) is provided on the side wall of the fixed arm (62), and the locking screw (64) locks the position of the sliding arm (63). The fixing member (7) is a clamp. There are two telescopic support arms (6), and the two telescopic support arms (6) are symmetrically distributed around the fixed shaft (1).

9. The bearing sleeve welding fixture according to claim 3, characterized in that, A cross lever (20) is provided on the upper end of the lower claw drive shaft (4), the upper end of the upper body of the upper claw drive sleeve (5), the circumference of the pressure plate (17), and the circumference of the lower end of the shift sleeve (151).

10. The bearing sleeve welding fixture according to claim 3, characterized in that, A reinforcing rib (21) is provided between the fixed disk (9) and the fixed shaft (1).

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