A tooling fixture for a handrail skeleton assembly

Abstract

The utility model relates to a tool clamp for handrail skeleton assembly, including work table, positioning mechanism and clamping mechanism. Positioning mechanism includes first positioning unit, second positioning unit and third positioning unit, and first positioning unit is equipped with upper base and the positioning pin assembly of Z axle movement, is used for positioning mounting panel, second positioning unit is equipped with at least a set of limit seat, and the supporting section is positioned, third positioning unit is equipped with concave fixed base, is used for positioning side shaft and crossbar section. Clamping mechanism includes first clamping unit, second clamping unit and third clamping unit, and each part is clamped and fixed respectively, guarantees welding positioning accuracy and clamping reliability.

Description

Technical Field

[0001] This utility model relates to the field of fixture technology, and in particular to a tooling fixture for handrail frame assembly. Background Technology

[0002] In motorcycle and some automobile manufacturing processes, the grab handle frame assembly, as an external auxiliary component of the vehicle body, is often formed by welding together multiple sections of metal parts to meet comprehensive requirements such as structural strength, assembly space, and functional integration. This type of frame assembly typically includes components such as mounting plates, support sections, side axles, and crossbar sections. These components are fixed together through multi-point welding to form an overall rigid frame structure. Generally, the welding points at the connections between the mounting plate and the support section, and between the support section and the side axle or crossbar section, are often irregular bends and corners with dispersed positioning references, requiring high precision. Therefore, in actual welding processes, the special structure of the workpiece and the dispersed distribution of welding points often make it difficult for traditional fixtures to effectively limit and stably clamp each component, thus affecting welding quality and assembly consistency. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a tooling fixture for handrail frame assembly. This fixture can achieve precise positioning and stable clamping in multiple spatial orientations to meet the welding connection requirements between multiple structural segments in the handrail frame assembly, thereby improving the positioning accuracy and clamping reliability in the welding process and ensuring welding quality and assembly consistency.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a tooling fixture for handrail frame assembly, including a worktable, a positioning mechanism and a clamping mechanism, characterized in that: the positioning mechanism and the clamping mechanism are fixed on the worktable;

[0005] The positioning mechanism includes a first positioning unit, a second positioning unit, and a third positioning unit. The first positioning unit includes an upper base fixed on the worktable and a positioning pin assembly that can move along the Z-axis. The positioning pin assembly includes at least one positioning pin and a first cylinder. The second positioning unit includes at least one set of limiting seats. The limiting seats have a through notch along the Y-axis and a through hole on the side wall. The third positioning unit includes a concave fixing seat.

[0006] The clamping mechanism includes a first clamping unit, a second clamping unit, and a third clamping unit. The first clamping unit includes at least one clamp and a second cylinder. The second clamping unit includes a third cylinder. The number of third cylinders is the same as the number of limit seats. The third clamping unit includes a fourth cylinder, a fifth cylinder, and a rotary cylinder. The rotary cylinder is connected to a pressure arm.

[0007] Furthermore, the positioning pin can extend upward through the worktable and the upper base, and the lower end of the positioning pin is fixed on the lower base below the worktable. The output shaft of the first cylinder is fixed to the lower base.

[0008] Furthermore, there are two concave fixing seats. The concave fixing seats are composed of a transverse base along the X-axis and two vertical blocks extending upward from the left and right ends of the base. The right vertical block is provided with two through holes, which are distributed along the Y-axis with a gap between them. An L-shaped limiting baffle is provided between the two vertical blocks, and the L-shaped limiting baffle is opposite to the through hole below the Y-axis.

[0009] Furthermore, there are two second cylinders, which are arranged horizontally along the X-axis, with a gap between them. Their output ends are opposite each other and connected to a clamping column.

[0010] Furthermore, the third cylinder is located between the two second cylinders, with each group of third cylinders arranged opposite to each other, and its output shaft can pass through the through hole of the limiting seat.

[0011] Furthermore, there are two fourth cylinders, which are horizontally arranged along the X-axis on the outside of the concave fixed seat, and their output ends can abut against the vertical block on the outside of the concave fixed seat.

[0012] Furthermore, there are two fifth cylinders, which are located at the bottom of the worktable between the fourth cylinders. The bottom of the worktable is provided with a through-hole. The output end of the fifth cylinder is fixedly connected to an L-shaped stop block. The vertical section of the L-shaped stop block passes through the through-hole, and a limiting post is connected to the vertical section facing the through hole above the Y-axis of the concave fixed seat.

[0013] Furthermore, the first cylinder, the second cylinder, the third cylinder, the fourth cylinder, and the fifth cylinder are double-acting cylinders; the rotary cylinder is a rotary downward pressing cylinder.

[0014] Furthermore, the workbench can be mounted on the positioner platform using screws.

[0015] Furthermore, the tooling fixture has a symmetrical structure along the Y-axis.

[0016] The beneficial effects of this utility model are:

[0017] 1. This utility model, by setting up multiple sets of positioning mechanisms for the mounting plate, support section, side shaft and crossbar section, can achieve precise positioning of each key welding part in multiple spatial orientations, ensure the positional consistency of the handrail frame assembly during the welding process, and improve the overall welding positioning accuracy.

[0018] 2. By setting up multiple clamping mechanisms and adopting a combination of horizontal clamping, vertical clamping and reverse clamping, this utility model can form a reliable and stable clamping force field for each welding area, prevent workpiece displacement during welding, and ensure the clamping reliability during welding.

[0019] 3. This utility model, through the reasonable design of the internal through hole and limiting baffle structure of the concave fixing seat, reserves sufficient welding operation space and coordinates with the clamping mechanism to achieve full accessibility of the welding parts of the handrail frame assembly, thereby improving the convenience of welding operation and welding quality. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural view of the tooling fixture of this utility model;

[0021] Figure 2 This is a schematic diagram of the first positioning unit structure of the tooling fixture of this utility model;

[0022] Figure 3 This is a schematic diagram of the third positioning unit and the third clamping unit of the tooling fixture of this utility model;

[0023] Figure 4 This is a structural schematic diagram of the handrail frame assembly of this utility model;

[0024] Figure 5 This is a front view of the tooling fixture assembly of the handrail frame of this utility model;

[0025] Figure 6 This is a perspective view of the tooling fixture assembly of the handrail frame of this utility model;

[0026] Figure 7 This is a schematic diagram of the mounting plate and support section clamping of the handrail frame assembly of this utility model;

[0027] Figure 8 This is a schematic diagram of the side shaft and crossbar section and the support section clamping of the handrail frame assembly of this utility model;

[0028] In the diagram: 1-Handrail frame assembly; 11-Mounting plate; 12-Support section; 13-Side shaft; 14-Crossbar section; 2-Workbench; 21-Through opening; 3-First positioning unit; 31-Upper base; 32-Positioning pin assembly; 321-Positioning pin; 322-First cylinder; 323-Lower base; 4-Second positioning unit; 41-Limiting seat; 411-First through hole; 5-Third positioning unit; 51-Concave fixing seat; 511-L-shaped limiting baffle; 512-Second through hole; 513-Third through hole; 6-First clamping unit; 61-Clamping clamp; 62-Second cylinder; 621-Pressure column; 7-Second clamping unit; 71-Third cylinder; 8-Third clamping unit; 81-Fourth cylinder; 82-Fifth cylinder; 821-L-shaped stop block; 822-Limiting column; 83-Rotating cylinder; 831-Pressure arm. Detailed Implementation

[0029] The present invention will now be further described with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0030] like Figure 1 As shown, a tooling fixture for a handrail frame assembly includes a worktable 2, a positioning mechanism and a clamping mechanism. The positioning mechanism and the clamping mechanism are both fixedly installed on the worktable 2, and the overall structure is symmetrically distributed along the Y-axis. The worktable 2 has a through-hole 21 in the middle.

[0031] The positioning mechanism includes a first positioning unit 3, a second positioning unit 4, and a third positioning unit 5.

[0032] like Figure 1 and Figure 2 As shown, the first positioning unit 3 includes an upper base 31 fixed on the worktable 2 and a positioning pin assembly 32. The positioning pin assembly 32 includes a positioning pin 321, a lower base 323, and a first cylinder 322. The lower base 323 is located below the worktable, and the lower end of the positioning pin 321 is fixed to the lower base 323. The positioning pin 321 can extend upward through the worktable 2 and the upper base 31. The output shaft of the first cylinder 322 is fixedly connected to the lower base 323, driving the lower base 323 to move the positioning pin 321 up and down along the Z-axis.

[0033] like Figure 1 As shown, the second positioning unit 4 includes at least one set of limiting seats 41. Each set consists of two seats. In this embodiment, there is one set of limiting seats 41, i.e., two seats. The limiting seats 41 are disposed on the worktable 2, and a through notch is formed inside them along the Y-axis direction. The side wall of the limiting seat 41 is provided with a first through hole 411.

[0034] like Figure 1 and Figure 3As shown, the third positioning unit 5 includes two concave fixing seats 51. Each concave fixing seat 51 consists of a base arranged laterally along the X-axis and two vertical blocks extending upward from the left and right ends of the base. The inner vertical block is provided with a second through hole 512 and a third through hole 513 distributed along the Y-axis. A gap is left between the two through holes. The second through hole 512 is above the third through hole 513. An L-shaped limiting baffle 511 is provided between the two vertical blocks. The L-shaped limiting baffle 511 is arranged opposite to the third through hole 513 in the Y-axis direction.

[0035] like Figure 1 As shown, the clamping mechanism includes a first clamping unit 6, a second clamping unit 7, and a third clamping unit 8.

[0036] The first clamping unit 6 includes at least one clamp 61 and two second cylinders 62 arranged horizontally along the X-axis. There is a gap between the two second cylinders 62, and their output ends are arranged opposite each other. The output ends are connected to a clamping column 621. The second cylinders 62 drive the clamping column 621 to move towards the center along the X-axis.

[0037] The second clamping unit 7 includes a third cylinder 71, and the number of third cylinders 71 is the same as the number of limiting seats 41. Since there is one set of limiting seats 41 in this embodiment, there is only one set of third cylinders 71, namely two. The two third cylinders 71 are located between the two second cylinders 62, and are arranged back-to-back with each other. They move outward along the X-axis, and their output shafts can pass through the first through hole 411 of the limiting seat 41.

[0038] like Figure 1 and Figure 3 As shown, the third clamping unit 8 includes a fourth cylinder 81, a fifth cylinder 82, and a rotary cylinder 83. Two fourth cylinders 81 are horizontally arranged along the X-axis, and their output ends abut against the vertical block on the outside of the concave fixing seat 51, providing lateral clamping force and pushing the concave fixing seat 51 towards the center. The fifth cylinder 82 is located at the bottom of the worktable 2 between the two fourth cylinders 81. The bottom of the worktable 2 has a through-hole 21. The output ends of the two fifth cylinders 82 are fixedly connected to L-shaped abutments 821. The vertical section of the L-shaped abutment 821 passes through the through-hole 21, and a limiting post 822 is fixedly connected to the vertical section. The limiting post 822 is installed on the back of the L-shaped abutment 821 and is arranged opposite to the output direction of the fifth cylinders 82, so that when the fifth cylinders 82 retract to both sides, the L-shaped abutment 821 moves to both sides as a whole, and the limiting post 822 abuts against the corresponding area of ​​the second through hole 512 inside the concave fixing seat 51. This type of clamping structure enables effective clamping within a limited space. The rotary cylinder 83 is positioned between two concave fixed seats 51, and its output end is connected to the pressure arm 831.

[0039] like Figure 4As shown, the armrest frame assembly 1 includes a mounting plate 11, a support section 12, a side shaft 13, and a crossbar section 14. The various parts of the armrest frame assembly 1 are welded together to form an overall frame structure. The mounting plate 11 has a certain curvature and is not completely straight. It has several mounting holes on its upper part, which are used for fixed connections with other structures of the vehicle body during the final assembly stage. The left and right ends of the mounting plate 11 each have a pair of upwardly extending connecting sections, which are used to weld to the upper ends of the corresponding support sections 12, forming symmetrical welding connection areas. The support section 12 includes two symmetrical independent components, which are respectively installed at the connecting section positions on the left and right ends of the mounting plate 11. The support section 12 is generally longitudinally strip-shaped, with a mating surface at its upper end corresponding to the shape of the connecting section of the mounting plate 11, and a through hole at its lower end. This through hole is used for positioning and insertion of the side shaft 13 and the crossbar section 14, and the welding connection surfaces between the lower end of the support section 12 and the side shaft 13 and crossbar section 14 are all located on the outside of the support section 12. There are two side shafts 13, symmetrically arranged on the left and right, with an overall shape resembling a screw. They are inserted horizontally from the inside to the outside of the support section 12 into the through hole at the lower end of the support section 12. The protruding part of the side shaft 13 is welded and fixed to the support section 12 at their outer contact area. The crossbar section 14 is a long rod-shaped member, with its two ends inserted into the through holes at the lower ends of the left and right support sections 12, respectively. The welding area between the crossbar section 14 and the support section 12 is also located on the outer side of each contact point.

[0040] like Figure 5 As shown, the first positioning unit 3 positions the mounting plate 11, and then the first clamping unit 6 clamps and fixes the mounting plate 11; the second positioning unit 4 positions the support section 12, and then the second clamping unit 7 clamps and fixes the support section 12; the third positioning unit 5 positions the side shaft 13 and the crossbar section 14, and then the third clamping unit 8 clamps and fixes the side shaft 13 and the crossbar section 14.

[0041] Specific examples Figure 7 As shown, the positioning pin 321 in the first positioning unit 3 is driven by the first cylinder 322 to move up and down along the Z-axis. The positioning pin 321 extends upward through the worktable 2 and the upper base 31 and inserts into the preset mounting hole of the mounting plate 11, thereby limiting the planar position of the mounting plate 11 and ensuring its positional accuracy in the X and Y axes. At the same time, the upper base 31 supports the bottom of the mounting plate 11 to ensure its height positioning. Meanwhile, the first clamping unit 6, composed of clamps 61 and second cylinders 62, works in conjunction. The two second cylinders 62 are horizontally opposite each other along the X-axis, driving the pressing column 621 to push inward, cooperating with the clamps 61 to press the mounting plate 11 from above. In this embodiment, there are three clamps 61, which further realizes the clamping and fixing of the mounting plate 11 in the Z-axis direction and prevents floating during the welding process.

[0042] like Figure 6As shown, in this embodiment, there are two limiting seats 41. The support segment 12 is inserted into the through notch of the limiting seat 41. The outer contour of the support segment 12 and the through notch form a matching limiting relationship, realizing limiting in the X-axis direction and providing support and positioning in the Z-axis direction. After the handrail frame assembly 1 is clamped, the first through hole 411 on the side wall of the limiting seat 41 allows the output shaft of the third cylinder 71 in the second clamping unit 7 to pass through and directly abut against both sides of the support segment 12, realizing clamping along the Y-axis and Z-axis directions. In another embodiment, a vertical clamp can be installed above the support segment 12 and the limiting seat 41, making the structure more compact. Since the limiting seat 41 plays a precise limiting role for the support segment 12, in conjunction with the clamping action of the third cylinder 71, the accuracy of the welding position between the mounting plate 11 and the support segment 12 can be effectively guaranteed.

[0043] like Figure 6 and Figure 7 As shown, the second cylinder 62 drives the clamping column 621 to push the mounting plate 11 inward along the X-axis, and the third cylinder 71 drives its output shaft to push the support section 12 outward along the X-axis. The two form opposing clamping forces, so that the connection between the mounting plate 11 and the support section 12 fits tightly, ensuring that the welding contact surface is stable and reliable.

[0044] like Figure 5 and Figure 8 As shown, the side shaft 13 passes through the second through hole 512 of the concave fixing seat 51, and the crossbar section 14 passes through the third through hole 513 of the concave fixing seat 51, facing the L-shaped limiting baffle 511 inside the concave fixing seat 51.

[0045] After the side shaft 13 and the crossbar segment 14 are initially positioned, the fifth cylinder 82 moves outward along the X-axis, causing the L-shaped stop block 821 to move outward synchronously. This causes the limiting post 822 fixed on the back of the L-shaped stop block 821 to abut against the outside of the side shaft 13, achieving initial clamping of the side shaft 13. Subsequently, the two fourth cylinders 81 drive their output ends to push inward along the X-axis, pushing the concave fixing seat 51 to move towards the center. This causes the L-shaped limiting baffle 511 inside the concave fixing seat 51 to abut against the crossbar segment 14 along the Y-axis, achieving initial clamping of the crossbar segment 14. It should be noted that the concave fixing seat 51 has an embedded structure design at the third through hole 513, which leaves sufficient welding operation clearance between the welding part of the crossbar segment 14 and the support segment 12 and the concave fixing seat 51, avoiding interference of the fixture structure with the welding operation. At the same time, the side shaft 13, because it abuts against the L-shaped limiting baffle 511, is not completely inserted into the concave fixing seat 51, and its connection with the support segment 12 also maintains a reserved gap to ensure the operating space of the welding gun. Finally, the rotary cylinder 83 drives the pressure arm 831 to perform a angular downward pressing action, clamping the crossbar segment 14 in the Z-axis direction from above, realizing further pressing and fixing of the crossbar segment 14, and ensuring the welding accuracy between the crossbar segment 14 and the support segment 12.

[0046] Specifically, in this embodiment, the first cylinder 322, the second cylinder 62, the third cylinder 71, the fourth cylinder 81, and the fifth cylinder 82 are all double-acting cylinders with horizontal movement. Controlled by an air source, their piston rods can reciprocate linearly in two horizontal directions, providing controllable propulsion and retraction strokes to ensure reliable operation and accurate resetting of the tooling fixture during positioning and clamping. The rotary cylinder 83 is a corner-down cylinder with an internal spiral guide structure. During driving, the output shaft generates a combined axial descent and angular rotation motion, driving the pressure arm 83 to rotate and descend from the top. The free end of the pressure arm faces the upper surface of the crossbar segment 14 and has a recess matching the shape of the upper surface of the crossbar segment 14, pressing against the crossbar segment 14 after the corner-down motion is completed.

[0047] The clamp 61 is a vertical clamp driven by a lever mechanism. Its lower end is connected to an adjustable-length pressure head, the end of which contacts the corresponding part of the handle 4. During the clamping process, the vertical clamp applies an axial clamping force downward by manually rotating the clamping handle or adjusting the position of the clamping screw.

[0048] In another embodiment of this patent, the workbench 2 can be mounted on the positioner with screws. The mounting position is located in a local area of ​​the positioner platform, so that the workbench 2 and the positioner form an integral movable and rotatable fixture mounting base, which facilitates the adjustment of position and posture in subsequent welding operations.

[0049] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A tooling fixture for a handrail frame assembly, comprising a worktable, a positioning mechanism, and a clamping mechanism, characterized in that: The positioning mechanism and clamping mechanism are fixed on the worktable; The positioning mechanism includes a first positioning unit, a second positioning unit, and a third positioning unit. The first positioning unit includes an upper base fixed on the worktable and a positioning pin assembly that can move along the Z-axis. The positioning pin assembly includes at least one positioning pin and a first cylinder. The second positioning unit includes at least one set of limiting seats. The limiting seats have a through notch along the Y-axis and a first through hole on the side wall. The third positioning unit includes a concave fixing seat. The clamping mechanism includes a first clamping unit, a second clamping unit, and a third clamping unit. The first clamping unit includes at least one clamp and a second cylinder. The second clamping unit includes a third cylinder. The number of third cylinders is the same as the number of limit seats. The third clamping unit includes a fourth cylinder, a fifth cylinder, and a rotary cylinder. The rotary cylinder is connected to a pressure arm.

2. The tooling fixture for a handrail frame assembly according to claim 1, characterized in that: The positioning pin can extend upward through the worktable and the upper base, and the lower end of the positioning pin is fixed on the lower base below the worktable. The output shaft of the first cylinder is fixed to the lower base.

3. A tooling fixture for a handrail frame assembly according to claim 1, characterized in that: There are two concave fixing seats. The concave fixing seats are composed of a transverse base along the X-axis and two vertical blocks extending upward from the left and right ends of the base. The inner vertical block is provided with a second through hole and a third through hole. The two through holes are distributed along the Y-axis with a gap between them. The second through hole is above the third through hole. An L-shaped limiting baffle is provided between the two vertical blocks. The L-shaped limiting baffle is opposite to the third through hole below the Y-axis.

4. A tooling fixture for a handrail frame assembly according to claim 1, characterized in that: There are two second cylinders, which are arranged horizontally along the X-axis. There is a gap between the two second cylinders, their output ends are opposite each other, and they are connected to a clamping column.

5. A tooling fixture for a handrail frame assembly according to claim 1, characterized in that: The third cylinder is located between the two second cylinders, with each group of third cylinders arranged opposite to each other, and its output shaft can pass through the through hole of the limiting seat.

6. A tooling fixture for a handrail frame assembly according to claim 1, characterized in that: There are two fourth cylinders, which are horizontally arranged on the outside of the concave fixed seat along the X-axis, and their output end can abut against the vertical block on the outside of the concave fixed seat.

7. A tooling fixture for a handrail frame assembly according to claim 1, characterized in that: There are two fifth cylinders, which are located at the bottom of the worktable between the fourth cylinders. The bottom of the worktable has a through-hole. The output end of the fifth cylinder is fixedly connected to an L-shaped stop block. The vertical section of the L-shaped stop block passes through the through-hole, and a limiting post is connected to the vertical section, which faces the through hole above the Y-axis of the concave fixed seat.

8. A tooling fixture for a handrail frame assembly according to claim 1, characterized in that: The first cylinder, the second cylinder, the third cylinder, the fourth cylinder, and the fifth cylinder are double-acting cylinders; the rotary cylinder is a rotary downward pressing cylinder.

9. A tooling fixture for a handrail frame assembly according to claim 1, characterized in that: The workbench can be mounted on the positioner platform with screws.

10. A tooling fixture for a handrail frame assembly according to any one of claims 1 to 9, characterized in that: The tooling fixture has a symmetrical structure along the Y-axis.

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