Handrail welding tool

Abstract

The invention belongs to the field of welding tools, and provides a handrail welding tool which comprises a tool table. The auxiliary mechanism comprises a reference block, a first positioning bead and a second positioning bead, a first reference surface is arranged on one side, opposite to the first positioning bead, of the reference block, and a second reference surface is arranged on one side, opposite to the second positioning bead, of the reference block; the first positioning bead and the second positioning bead are movably arranged in the reference block and can abut against the inner wall of the reference hole. Compared with the prior art, the device has the advantages that the first positioning surface and the second positioning surface are precisely attached to the first reference surface and the second reference surface respectively in the mode that the first positioning bead and the second positioning bead are driven by one driving source to abut against the inner wall of the reference hole, and therefore it is guaranteed that the position of the fixing block is precise and free of deviation in the welding process; the situation that the overall positioning precision of the fixed block is affected by machining errors of the reference block is avoided, the welding positioning precision of the handrail is remarkably improved, and the consistency of product quality is ensured.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of welding tooling, and particularly relates to a handrail welding tooling. BACKGROUND

[0002] In the manufacturing process of a vehicle seat, a handrail is usually welded by sheet metal and a metal fixing block. As shown in the figure, a reference hole for connecting a seat rotating shaft is arranged on the fixing block, and a first positioning surface and a second positioning surface perpendicular to each other or at a specific angle are arranged on the inner wall of the reference hole as positioning references for subsequent assembly with the rotating shaft. In order to ensure the accuracy of the angle and position of the handrail after installation, the relative position between the sheet metal of the handrail and the fixing block must be strictly controlled during the welding stage. Figure 1

[0003] In the prior art, a simple clamp is usually used to press and weld the sheet metal of the handrail and the fixing block, but the reference hole of the fixing block is not effectively utilized, and manual visual alignment or additional measurement tools are often used for positioning, which results in low positioning accuracy and poor repeatability. Especially in batch production, cumulative errors are easy to cause poor cooperation between the handrail and the seat rotating shaft, which affects the assembly efficiency and the riding comfort. In addition, the positioning block used in the prior art cannot guarantee the accuracy of the position of the fixing block due to its own machining errors, and the end of the sheet metal of the handrail far away from the fixing block is prone to rotational deviation, which ultimately affects the welding quality of the overall product. SUMMARY

[0004] The present application aims to solve the above problems in the prior art, and provides a handrail welding tooling which is simple in structure, good in stability, can realize accurate positioning in two directions under a single driving force, and can guarantee welding accuracy.

[0005] The purpose of the present application can be achieved by the following technical problems. A handrail welding tooling is provided, the handrail includes a handrail sheet metal and a fixing block, the fixing block is provided with a reference hole for connecting a seat rotating shaft, the reference hole has a first positioning surface and a second positioning surface arranged adjacent to each other, and the welding tooling is used to weld the handrail sheet metal and the fixing block into one body. The welding tooling includes: a tooling table; a positioning mechanism and an anti-disengagement mechanism arranged on the tooling table, the positioning mechanism is used to limit the relative position of the handrail sheet metal and the fixing block, and the anti-disengagement mechanism is used to prevent the handrail sheet metal and the fixing block from disengaging out of the positioning mechanism; an auxiliary mechanism arranged on the tooling table, the auxiliary mechanism includes a reference block, a first positioning bead and a second positioning bead, wherein: ​A first reference surface is arranged on the side opposite to the first positioning bead, and a second reference surface is arranged on the side opposite to the second positioning bead; the first positioning bead and the second positioning bead are movably arranged in the reference block and can abut against the inner wall of the reference hole; When the first positioning bead and the second positioning bead extend outward and push the fixed block to move, the first positioning surface is tightly attached to the first reference surface, and the second positioning surface is tightly attached to the second reference surface.

[0006] In the above handrail welding tool, the first guide hole and the second guide hole are arranged at an included angle and are in communication with each other, the first positioning bead is movably arranged in the first guide hole, and the second positioning bead is movably arranged in the second guide hole.

[0007] In the above handrail welding tool, the end of the first guide hole and the end of the second guide hole are symmetrically formed with inwardly bent clamping edges, the first positioning bead and the second positioning bead are movably attached to the clamping edges and can locally extend outside the reference block.

[0008] In the above handrail welding tool, the auxiliary mechanism further comprises a driving rod with a driving surface, a guide hole is arranged in the reference block in the vertical direction, the first guide hole and the second guide hole are in communication with the guide hole, the driving rod is inserted in the guide hole, and the first positioning bead and the second positioning bead can be moved along the axis direction of the first guide hole and the second guide hole, respectively, by the driving surface of the driving rod.

[0009] In the above handrail welding tool, the driving rod is arranged eccentrically in the guide hole.

[0010] In the above handrail welding tool, the auxiliary mechanism further comprises a lifting cylinder and a connecting block, a driving shaft is arranged on the driving end of the lifting cylinder, and the driving shaft is detachably connected with the connecting block; a T-shaped groove is arranged in the connecting block, a T-shaped block is formed at the bottom end of the driving rod, and the T-shaped block is movably clamped in the T-shaped groove.

[0011] In the above handrail welding tool, an air passage is further arranged in the reference block, a positioning base is arranged on the tool table, a blowing passage is arranged in the positioning base, one end of the air passage is in communication with the guide hole, the other end of the air passage is in communication with the blowing passage, and an air pipe joint is arranged at the end of the blowing passage away from the air passage.

[0012] In the aforementioned handrail welding fixture, a locking hole is provided in the positioning base, and a locking groove is formed on the outer wall of the reference block. The fastener in the locking hole is movably pressed against the locking groove to restrict the movement of the reference block relative to the fixture table.

[0013] In the aforementioned handrail welding fixture, the positioning mechanism includes a support block, a positioning cylinder, and several limiting blocks. The support block is used to support the handrail sheet metal and the fixing block. The output end of the positioning cylinder is connected to a positioning pin, which is movably inserted into the handrail sheet metal. Several limiting blocks are disposed on the positioning base and enclose a positioning cavity. A support sheet metal is formed at the end of the handrail sheet metal near the fixing block, and the support sheet metal is disposed within the positioning cavity.

[0014] In the aforementioned handrail welding fixture, the anti-detachment mechanism includes a clamping cylinder and a pressing cylinder. The output end of the clamping cylinder is connected to a clamping block, which moves against the edge of the handrail sheet metal to prevent the handrail sheet metal from detaching from the positioning pin. The output end of the pressing cylinder is connected to a pressing block, which moves to press against the top wall of the fixing block.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) The handrail welding fixture of the present invention drives the first and second positioning beads to abut against the inner wall of the reference hole by a driving source, so that the first and second positioning surfaces are precisely fitted with the first and second reference surfaces respectively, thereby ensuring that the fixed block is accurately positioned and without deviation during the welding process. The overall structure occupies less space and avoids the reference block from affecting the overall positioning accuracy of the fixed block due to its own processing error, which significantly improves the welding positioning accuracy of the handrail and ensures the consistency of product quality.

[0017] (2) By setting the tight edge, the positioning bead can be limited and guided, preventing it from completely falling out of the reference block, while allowing it to extend partially to contact the inner wall of the reference hole of the fixed block. This ensures the reliable movement of the positioning bead, enhances the durability and safety of the overall mechanism, extends the service life of the tooling, and avoids positioning failure caused by the loosening or falling off of the positioning bead.

[0018] (3) By setting the drive rod eccentrically in the guide hole, it is ensured that the drive rod can generate a small lateral force during the lifting process, so that the first and second positioning beads press more tightly against the inner wall of the reference hole, enhance the contact pressure between the positioning beads and the fixing block, and avoid the surface in the reference hole that contacts the two positioning beads from affecting the stability and accurate clamping of the positioning beads due to processing errors. Attached Figure Description

[0019] Figure 1This is a structural diagram of the handrail sheet metal and the fixing block; Figure 2 This is a schematic diagram of the overall structure of this application; Figure 3 This is a structural diagram showing the positioning base, reference block, fixing block, and handrail sheet metal. Figure 4 yes Figure 3 Schematic diagram of the cross section at point AA; Figure 5 yes Figure 3 Schematic diagram of the cross section at point BB; Figure 6 It is an exploded view of the drive rod, reference block, and fixed block; Figure 7 This is a schematic diagram of the installation structure of the positioning mechanism and the anti-detachment mechanism on the tooling table.

[0020] In the diagram, 1 is the handrail sheet metal; 10 is the support sheet metal. 2. Fixing block; 20. Reference hole; 200. First positioning surface; 201. Second positioning surface; 3. Tooling table; 30. Positioning base; 300. Air blowing channel; 301. Air pipe connector; 302. Locking hole; 302a. Fastener; 4. Positioning mechanism; 40. Support block; 41. Positioning cylinder; 410. Positioning pin; 42. Limiting block; 420. Positioning cavity; 5. Anti-detachment mechanism; 50. Clamping cylinder; 500. Clamping block; 51. Pressing cylinder; 510. Pressing block; 6. Auxiliary mechanism; 60. Reference block; 600. First reference surface; 601. Second reference surface; 602. First guide hole; 603. Second guide hole; 604a. Tightening edge; 605. Guide hole; 606. Vent hole; 607. Locking groove; 61. First positioning bead; 62. Second positioning bead; 63. Drive rod; 630. Drive surface; 631. T-block; 64. Lifting cylinder; 640. Drive shaft; 65. Connecting block; 650. T-slot. Detailed Implementation

[0021] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0022] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0023] likeFigure 1 As shown, the armrest in this solution mainly includes two structures: armrest sheet metal 1 and fixing block 2. The fixing block 2 is provided with a reference hole 20 for connecting the seat pivot. The reference hole 20 has a first positioning surface 200 and a second positioning surface 201 arranged adjacent to each other. The armrest sheet metal 1 and fixing block 2 are welded together by welding fixtures.

[0024] like Figures 2 to 7 As shown, the present invention provides a handrail welding fixture, which includes a fixture table 3, a positioning mechanism 4, an anti-detachment mechanism 5, and an auxiliary mechanism 6.

[0025] The positioning mechanism 4 and the anti-detachment mechanism 5 are mounted on the tooling table 3. The positioning mechanism 4 is used to limit the relative position of the handrail sheet metal 1 and the fixing block 2, and the anti-detachment mechanism 5 prevents the handrail sheet metal 1 and the fixing block 2 from detaching from the positioning mechanism 4. The auxiliary mechanism 6 is mounted on the tooling table 3. The auxiliary mechanism 6 includes a reference block 60, a first positioning bead 61 and a second positioning bead 62. On the reference block 60, a first reference surface 600 is provided on the side opposite to the first positioning bead 61, and a second reference surface 601 is provided on the side opposite to the second positioning bead 62. The first positioning bead 61 and the second positioning bead 62 are both movably mounted in the reference block 60 and can abut against the inner wall of the reference hole 20. When the first positioning bead 61 and the second positioning bead 62 extend outward and push the fixing block 2 to move, the first positioning surface 200 is pressed against the first reference surface 600, and the second positioning surface 201 is pressed against the second reference surface 601.

[0026] Because the overall length of the handrail sheet metal 1 is relatively large, before welding the handrail sheet metal 1 to the fixing block 2, it is necessary to ensure that the fixing block 2 is accurately positioned at the welding point. This prevents the far end of the handrail sheet metal 1 from rotating due to positioning errors of the fixing block 2. Specifically, the operator or robot initially places the fixing block 2 in the predetermined area on the tooling table 3. It is worth noting that both the reference hole 20 and the reference block 60 in this solution are square holes. Only when the relative positions of the reference hole 20 and the handrail sheet metal 1 are... Figure 1Accurate welding positions are crucial to ensuring the integration precision and comfort of the armrest on the seat. Therefore, as the reference hole 20 on the fixing block 2 is fitted onto the reference block 60, the auxiliary mechanism 6 drives the first positioning bead 61 and the second positioning bead 62 to extend from inside the reference block 60 to outside. During this process, since the extension directions of the first positioning bead 61 and the second positioning bead 62 are perpendicular to the first reference surface 600 and the second reference surface 601, respectively, they exert a horizontal thrust on the fixing block 2. Under the coordinated action of the first positioning bead 61 and the second positioning bead 62, the fixing block 2 is pushed to move along two orthogonal directions until it is fixed. The first positioning surface 200 of block 2 is completely attached to the first reference surface 600 of reference block 60; the second positioning surface 201 of fixed block 2 is completely attached to the second reference surface 601 of reference block 60. At this time, fixed block 2 completes high-precision two-dimensional constraint in two planes (similar to the XY plane in coordinates), providing a positioning reference for the subsequent installation of handrail sheet metal 1. When handrail sheet metal 1 is fitted onto fixed block 2, under the coordinated positioning and pressing action of positioning mechanism 4 and anti-detachment mechanism 5, the handrail sheet metal 1 and fixed block 2 can still be firmly clamped under welding thermal deformation or external force disturbance, effectively preventing relative displacement or separation between the two and ensuring welding quality. Therefore, this solution utilizes the telescopic movement of the first positioning bead 61 and the second positioning bead 62 to automatically adapt to the inner wall of the reference hole 20 during the clamping process. This effectively pushes the fixing block 2 into place (i.e., the first reference surface 600 and the second reference surface 601 are respectively in contact with the first positioning surface 200 and the second positioning surface 201 inside the reference hole 20 of the fixing block 2), ensuring that the fixing block 2 is accurately positioned and without deviation during the welding process. It also avoids positioning errors of the fixing block 2 that could affect the welding accuracy of the handrail sheet metal 1, thus greatly ensuring the consistency of the product.

[0027] The reference block 60 has a first guide hole 602 and a second guide hole 603 that are set at an angle and are interconnected. The first positioning bead 61 is movably disposed in the first guide hole 602, and the second positioning bead 62 is movably disposed in the second guide hole 603.

[0028] like Figures 3 to 6 As shown, in this scheme, the axial direction of the first guide hole 602 is perpendicular to the first reference surface 600, and the axial direction of the second guide hole 603 is perpendicular to the second reference surface 601. By setting the first guide hole 602 and the second guide hole 603, which are at an angle and interconnected, in the reference block 60, the first positioning bead 61 and the second positioning bead 62 can extend out in a specific direction to accurately correspond to two adjacent surfaces on the fixed block 2 (i.e., two adjacent surfaces in the reference hole 20 other than the first positioning surface 200 and the second positioning surface 201). This structural design ensures the certainty of the movement trajectory of the first / second positioning bead 62, provides full-range guiding support for the positioning bead, prevents it from tilting, jamming or lateral jumping when under force, and improves the reliability of the tooling for long-term use.

[0029] Preferably, such as Figure 4 and Figure 5 As shown in the structure, the first guide hole 602 and the second guide hole 603 in this embodiment both adopt a through-hole structure design. This design can be machined by a milling cutter, which is convenient for batch processing and also provides convenience for subsequent maintenance and replacement.

[0030] The ends of the first guide hole 602 and the second guide hole 603 are symmetrically formed with inwardly bent clamping edges 604a. The first positioning bead 61 and the second positioning bead 62 are movably attached to the clamping edge 604a and can partially extend outside the reference block 60.

[0031] like Figure 4 and Figure 5 As shown, in this embodiment, an inwardly bent clamping edge 604a is provided at the ends of the first guide hole 602 and the second guide hole 603. The clamping edge 604a can both limit and guide the positioning beads, preventing the first / second positioning beads 62 from completely dislodging from the reference block 60, and allow them to partially extend to contact the two adjacent surfaces inside the reference hole 20, excluding the first positioning surface 200 and the second positioning surface 201. This structure not only ensures the reliable movement of the positioning beads, but also enhances the durability and safety of the overall mechanism, extends the service life of the tooling, and avoids positioning failure caused by the loosening or falling off of the positioning beads.

[0032] Preferably, in this design, the first / second positioning beads 62 and the first / second guide holes 603 are installed with a small gap to ensure that the positioning beads can roll freely and smoothly within the guide holes, effectively preventing the positioning beads from getting stuck and affecting the precise positioning of the fixing block 2. It should be noted that in this embodiment, lubricating oil can also be applied to the first positioning beads 61 and the second positioning beads 62 to further improve the accuracy and reliability of the positioning beads in positioning the fixing block 2 within the corresponding guide holes.

[0033] The auxiliary mechanism 6 also includes a drive rod 63 with a drive surface 630. A guide hole 605 is provided in the reference block 60 along the vertical direction. The first guide hole 602 and the second guide hole 603 are both connected to the guide hole 605. The drive rod 63 is inserted into the guide hole 605 and can push the first positioning bead 61 and the second positioning bead 62 to move along the axial direction of the first guide hole 602 and the second guide hole 603 respectively through the drive surface 630.

[0034] This solution achieves precise positioning of the fixed block 2 by using a single drive rod 63, specifically, as follows: Figures 4 to 6As shown, the first positioning bead 61 and the second positioning bead 62 are initially retracted into the first guide hole 602 and the second guide hole 603, respectively. After the fixing block 2 is fitted onto the reference block 60 for initial positioning, the auxiliary mechanism 6 can push the drive rod 63 along... Figure 4 The device moves vertically upwards (i.e., along the axis of the guide hole 605). During this process, the driving surface 630 in this design is inclined (similar to the inclined surface on a frustum of a cone, see reference). Figure 6 As shown in the structure, after the driving surface 630 gradually comes into contact with the first positioning bead 61, it can convert the vertical driving force of the driving rod 63 into the horizontal thrust of the first positioning bead 61 under the action of the inclined plane, forcing the first positioning bead 61 to extend outward along the first guide hole 602; similarly, the driving surface 630 pushes the second positioning bead 62 outward along the second guide hole 603 in the same principle. When both positioning beads extend and abut against the two adjacent surfaces in the reference hole 20, excluding the first positioning surface 200 and the second positioning surface 201, a stable fit between the first positioning surface 200 and the first reference surface 600, and a stable fit between the second positioning surface 201 and the second reference surface 601 can be achieved during the movement of the fixed block 2 relative to the reference block 60. It is worth noting that after the fixed block 2 is welded to the handrail sheet metal 1 and then disassembled, the driving rod 63 can extend outward along the first guide hole 602. Figure 4 or Figure 5 As the vertical direction moves downward, the first positioning bead 61 and the second positioning bead 62 automatically retract into their corresponding guide holes (due to the small downward displacement of the drive rod 63, the positioning beads will automatically move closer to the guide hole 605, but will not fall into the guide hole 605), facilitating subsequent positioning welding of the fixing block 2. This design simplifies the operation process, improves positioning efficiency, and the integrated drive structure reduces the number of external actuators, making the tooling structure more compact and responsive, suitable for the rapid clamping and release requirements of automated production lines. Furthermore, the positioning method of a single drive rod 63 pushing two positioning beads through the drive surface 630 eliminates the instability problem caused by spring aging or friction differences in traditional structures, thus ensuring that the fixing block 2 can accurately fall into the same positioning position each time, improving welding repeatability accuracy.

[0035] Preferably, such as Figures 4 to 6 As shown, in this design, the drive rod 63 is eccentrically positioned in the guide hole 605. In other words, this eccentric positioning (i.e., the drive rod 63 and the guide hole 605 are clearance-fitted) provides space for the drive rod 63 to move radially within the guide hole 605. Specifically, when there are no machining errors on the two adjacent surfaces within the reference hole 20 other than the first positioning surface 200 and the second positioning surface 201 (in this embodiment, the two adjacent surfaces are defined as the α surface and the β surface, see reference...), Figure 6The structure shown has the α surface opposite to the first positioning surface 200 and the β surface opposite to the second positioning surface 201 (this definition will be used in the following discussion). Through the lifting action of the drive rod 63, the drive surface 630 can push the first positioning bead 61 and the second positioning bead 62 to simultaneously abut against the α surface and the β surface, respectively. This ensures that the first positioning surface 200 and the second positioning surface 201 on opposite sides within the reference hole 20 are accurately fitted against the first reference surface 600 and the second reference surface 601, ultimately achieving precise positioning of the fixing block 2. However, if machining errors occur in the α surface and the β surface within the reference hole 20 during manufacturing (i.e., the distance between the α surface and the side of the reference block 60 opposite to the first reference surface 600 is greater than or less than the distance between the β surface and the side of the reference block 60 opposite to the second reference surface 601), and the distance between the α surface and the reference block 60 is less than the distance between the β surface and the reference block 60, then... Given the distance between the reference blocks 60, as the drive rod 63 rises vertically, it can push the first positioning bead 61 against the α surface via the drive surface 630. Notably, during this process, the drive rod 63 also pushes the second positioning bead 62 to roll within the second guide hole 603 via the drive surface 630. However, due to the greater distance to the β surface, the second positioning bead 62 cannot directly contact the β surface. As the drive rod 63 continues to rise, since the first positioning bead 61 has already extended into place, the drive rod 63 will generate a small lateral force during the continued rising process. This causes the second positioning bead 62 to press tightly against the β surface under further rolling force, ensuring that the first positioning surface 200 and the second positioning surface 201 on the fixed block 2 can accurately adhere to the first reference surface 600 and the second reference surface 601 respectively, improving positioning accuracy and anti-interference capability. Similarly, when the distance between the α surface and the reference block 60 is greater than the distance between the β surface and the reference block 60, the driving surface 630 on the driving rod 63 can push the second positioning bead 62 to pre-commit contact with the β surface, and the lateral force generated when the driving rod 63 continues to rise will stably press the first positioning bead 61 against the α surface. This structural design effectively solves the problem that the first / second positioning bead 62 may not be properly contacted due to machining errors on the α and β surfaces in the reference hole 20, thereby ensuring the accuracy and reliability of the first positioning surface 200 and the second positioning surface 201 in close contact with the first reference surface 600 and the second reference surface 601, respectively.

[0036] The auxiliary mechanism 6 also includes a lifting cylinder 64 and a connecting block 65. The driving end of the lifting cylinder 64 is provided with a driving shaft 640, and the driving shaft 640 is detachably connected to the connecting block 65. A T-slot 650 is provided in the connecting block 65, and a T-block 631 is formed at the bottom end of the driving rod 63. The T-block 631 is movably engaged in the T-slot 650.

[0037] like Figure 6As shown, this embodiment uses a lifting cylinder 64 to automatically raise and lower the drive rod 63. This structure achieves automated positioning, avoiding errors and inefficiencies associated with manual operation. Furthermore, the snap-fit ​​structure between the T-block 631 and the T-slot 650 in this solution enables a detachable connection between the drive rod 63 and the connecting block 65. When the drive rod 63 shows signs of wear or damage, this structure allows for quick disassembly and assembly for maintenance and replacement, greatly improving convenience and work efficiency.

[0038] Furthermore, it is worth noting that the aforementioned drive rod 63 will inevitably experience a slight tilt when generating a lateral component force. To accommodate this phenomenon, the T-block 631 in this design also adopts a gap-type assembly method within the T-slot 650. That is, the T-block 631 can move within the T-slot 650 in the vertical direction. This provides sufficient space for the tilt phenomenon when the drive rod 63 generates a lateral component force, avoiding jamming between the drive rod 63 and the connecting block 65. This ensures accurate contact between the first positioning bead 61 and the second positioning bead 62 with the α surface and β surface, respectively, thereby guaranteeing the accuracy and reliability of the positioning action of the first positioning surface 200 and the second positioning surface 201.

[0039] The reference block 60 is also provided with a vent 606. The tooling table 3 is provided with a positioning base 30. The positioning base 30 is provided with an air blowing channel 300. One end of the vent 606 is connected to the guide hole 605, and the other end is connected to the air blowing channel 300. An air pipe connector 301 is installed at the end of the air blowing channel 300 away from the vent 606.

[0040] like Figure 5 As shown, this solution also adds a vent 606 inside the reference block 60, which is connected to the air blowing channel 300 and air pipe connector 301 on the tooling table 3. When the first / second positioning ball 62 retracts, the vent 606, air blowing channel 300, and first / second guide hole 603 are in a state of mutual communication. In other words, after the drive rod 63 completes its reset action, external clean compressed air enters the air blowing channel 300 through the air pipe connector 301 and flows into the guide hole 605. The high-speed airflow sweeps upward along the gap between the outer wall of the drive rod 63 and the guide hole 605, blowing out the welding slag, metal dust, oil, or cooling spatter accumulated in the hole. At the same time, the airflow can also disturb the intersection area of ​​the first and second guide holes 603, helping to remove any particles that may fall in. Therefore, this self-cleaning function effectively prevents impurities from jamming the drive rod 63 and positioning ball, ensuring their smooth long-term movement, improving the reliability and service life of the tooling, and reducing the frequency of downtime maintenance. It should be noted that, as Figure 5All other openings in the air blowing channel 300 shown can be sealed with fixing screws and sealing rings to ensure airtightness when the entire air blowing channel 300 is connected to the vent 606.

[0041] The positioning base 30 has a locking hole 302, and the outer wall of the reference block 60 has a locking groove 607. The fastener 302a in the locking hole 302 is movably pressed against the locking groove 607 to restrict the movement of the reference block 60 relative to the tooling table 3.

[0042] like Figure 4 and Figure 6 As shown, this solution provides a locking hole 302 on the positioning base 30. Fasteners 302a (screws or other structures) are connected to the locking hole 302 and can also be pressed against the locking groove 607, thus achieving a firm fixation of the reference block 60 on the tooling table 3. This prevents displacement during welding impact or cylinder operation. The locking structure is simple and reliable, easy to install and adjust, and can effectively resist dynamic loads, prevent loosening, and ensure the long-term stability of the reference surface position. This provides a guarantee for the consistency of welding dimensions between the subsequent handrail sheet metal 1 and the fixing block 2.

[0043] The positioning mechanism 4 includes a support block 40, a positioning cylinder 41, and several limiting blocks 42. The support block 40 is used to support the handrail sheet metal 1 and the fixing block 2. The output end of the positioning cylinder 41 is connected to a positioning pin 410, which is movably inserted into the handrail sheet metal 1. Several limiting blocks 42 are set on the positioning base 30 and surround the positioning cavity 420. The end of the handrail sheet metal 1 near the fixing block 2 forms a support sheet metal 10, which is set in the positioning cavity 420.

[0044] like Figure 7 As shown, after the fixed block 2 on the handrail is precisely positioned by the reference block 60, the handrail sheet metal 1 on the handrail can be fitted onto the fixed block 2. During this process, the supporting sheet metal 10 falls into the positioning cavity 420 surrounded by the limiting block 42, thereby achieving the initial positioning effect of the handrail sheet metal 1. As the handrail sheet metal 1 overlaps on the supporting block 40, the positioning cylinder 41 at the corresponding position can drive the positioning pin 410 to be inserted into the handrail sheet metal 1. It is worth noting that the positioning cylinder 41 and the positioning pin 410 in this solution are set in both the horizontal and vertical directions. Therefore, a multi-point collaborative positioning system is formed under multi-dimensional constraint. With the pressing operation of the anti-detachment mechanism 5, it not only effectively restricts the freedom of the handrail sheet metal 1 and the fixed block 2 in the X, Y, and Z directions, but also enhances the overall rigidity by embedding the supporting sheet metal 10 into the positioning cavity 420, significantly improving the structural stability during the welding process and avoiding weld offset or incomplete welding caused by workpiece shaking.

[0045] The anti-detachment mechanism 5 includes a clamping cylinder 50 and a pressing cylinder 51. The output end of the clamping cylinder 50 is connected to a clamping block 500, which moves against the edge of the handrail sheet metal 1 to prevent the handrail sheet metal 1 from detaching from the positioning pin 410. The output end of the pressing cylinder 51 is connected to a pressing block 510, which moves to press against the top wall of the fixing block 2.

[0046] Furthermore, such as Figure 7 As shown, the anti-detachment mechanism 5 in this solution includes a clamping cylinder 50 and a pressing cylinder 51. The clamping block 500 restricts the edge of the handrail sheet metal 1 from detaching from the positioning pin 410, and the pressing block 510 presses the top wall of the fixing block 2, thereby applying constraint forces in various directions to the workpiece. This anti-detachment design effectively overcomes the problem of workpiece loosening or warping caused by thermal expansion, electromagnetic force or mechanical vibration during the welding process, ensuring that the workpiece position remains unchanged throughout the welding process, and greatly improving the welding quality and the finished product qualification rate.

[0047] It should be noted that this invention, through the systematic design of positioning, anti-detachment, and auxiliary mechanisms 6, solves the technical problems of inaccurate positioning, easy loosening, and poor repeatability in armrest welding. It has significant advantages such as high positioning accuracy, stable clamping, strong automation compatibility, convenient maintenance, and long service life, making it suitable for high-precision welding scenarios such as automotive seat armrests. Furthermore, the overall positioning and clamping structure and working principle of the armrest sheet metal 1 and the supporting sheet metal 10 are the same as those in existing tooling fixtures, and will not be described in detail here.

[0048] It should be noted that in this invention, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0050] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A welding fixture for an armrest, the armrest comprising an armrest sheet metal and a fixing block, the fixing block having a reference hole for connecting a seat pivot, the reference hole having a first positioning surface and a second positioning surface arranged adjacent to each other, the welding fixture being used to weld the armrest sheet metal and the fixing block together, characterized in that, The welding fixture includes: Tooling table; A positioning mechanism and an anti-detachment mechanism are provided on the tooling table. The positioning mechanism is used to limit the relative position of the handrail sheet metal and the fixing block, and the anti-detachment mechanism is used to prevent the handrail sheet metal and the fixing block from detaching from the positioning mechanism. An auxiliary mechanism is provided on the tooling table. The auxiliary mechanism includes a reference block, a first positioning bead, and a second positioning bead, wherein: On the reference block, a first reference surface is provided on the side opposite to the first positioning bead, and a second reference surface is provided on the side opposite to the second positioning bead; both the first positioning bead and the second positioning bead are movably disposed within the reference block and can abut against the inner wall of the reference hole; When the first positioning bead and the second positioning bead extend outward and push the fixed block to move, the first positioning surface is pressed against the first reference surface, and the second positioning surface is pressed against the second reference surface.

2. The handrail welding fixture according to claim 1, characterized in that, The reference block has a first guide hole and a second guide hole that are angled together and interconnected. The first positioning bead is movably disposed in the first guide hole, and the second positioning bead is movably disposed in the second guide hole.

3. The handrail welding fixture according to claim 2, characterized in that, The ends of the first guide hole and the second guide hole are symmetrically formed with inwardly bent clamping edges. The first positioning bead and the second positioning bead are movably attached to the clamping edges and can partially extend outside the reference block.

4. The handrail welding fixture according to claim 2, characterized in that, The auxiliary mechanism also includes a drive rod with a drive surface. A guide hole is provided in the reference block along the vertical direction. The first guide hole and the second guide hole are both connected to the guide hole. The drive rod is inserted into the guide hole and can push the first positioning bead and the second positioning bead to move along the axial direction of the first guide hole and the second guide hole, respectively, through the drive surface.

5. The handrail welding fixture according to claim 4, characterized in that, The drive rod is eccentrically positioned within the guide hole.

6. The handrail welding fixture according to claim 4, characterized in that, The auxiliary mechanism also includes a lifting cylinder and a connecting block. The driving end of the lifting cylinder is provided with a driving shaft, which is detachably connected to the connecting block. A T-slot is provided in the connecting block, and a T-block is formed at the bottom end of the driving rod. The T-block is movably engaged in the T-slot.

7. The handrail welding fixture according to claim 4, characterized in that, The reference block is also provided with a vent hole, the tooling table is provided with a positioning base, the positioning base is provided with an air blowing channel, one end of the vent hole is connected to the guide hole, the other end is connected to the air blowing channel, and an air pipe connector is installed at the end of the air blowing channel away from the vent hole.

8. The handrail welding fixture according to claim 7, characterized in that, The positioning base has a locking hole, and the outer wall of the reference block has a locking groove. The fastener in the locking hole is moved against the locking groove to restrict the movement of the reference block relative to the tooling table.

9. A handrail welding fixture according to claim 7, characterized in that, The positioning mechanism includes a support block, a positioning cylinder, and several limiting blocks. The support block is used to support the handrail sheet metal and the fixing block. The output end of the positioning cylinder is connected to a positioning pin, which is movably inserted into the handrail sheet metal. Several limiting blocks are disposed on the positioning base and surround a positioning cavity. A support sheet metal is formed at the end of the handrail sheet metal near the fixing block, and the support sheet metal is disposed in the positioning cavity.

10. A handrail welding fixture according to claim 9, characterized in that, The anti-detachment mechanism includes a clamping cylinder and a pressing cylinder. The output end of the clamping cylinder is connected to a clamping block, which moves against the edge of the handrail sheet metal to prevent the handrail sheet metal from detaching from the positioning pin. The output end of the pressing cylinder is connected to a pressing block, which moves to press against the top wall of the fixing block.

Images