Vehicle bottom door frame welding clamp tool

Abstract

The utility model is suitable for the technical field of welding tools, and provides a vehicle bottom door frame welding clamp tool which comprises an outer frame and a clamp tool assembly installed on the outer frame, positioning end seats are installed on the two sides, located in the transverse direction, of the outer frame, and a plurality of frame supporting beams are arranged in the outer frame in the transverse direction and the longitudinal direction of the outer frame. The clamp tool assembly comprises a plurality of spiral pressing arms and spiral pushing arms which are arranged on the outer frame, and a plurality of vertical clamps arranged on the frame supporting beams. Therefore, according to the bottom door frame overall welding tool, the welding angle of the bottom door frame overall welding tool for different left and right vehicle types can be switched through the positioner, the positioning reference can be freely set through adjustment of the positioning base, and various size requirements are met. Meanwhile, the vehicle bottom door frame can be more stably fixed to the tool through the vertical clamps of the tool, accurate positioning is achieved, meanwhile, sufficient fixing is guaranteed when a positioner turns over, and therefore the effect of reducing the deformation amount after welding is achieved.

Description

Technical Field

[0001] This utility model applies to the field of welding tooling technology and provides a welding fixture for a car underbody door frame. Background Technology

[0002] The aluminum alloy bottom door frame is one of the most important components of freight rail transit vehicles, providing load-bearing capacity and facilitating rapid unloading of freight goods such as grain. A typical aluminum alloy freight car body mainly consists of major components such as the underframe, aluminum sidewalls, aluminum roof, aluminum end walls, and aluminum bottom door frame. The bottom door frame, as the main load-bearing structure, bears the majority of the weight of the load and is connected to the bottom door panel via a cylinder device. The bottom door panel transmits traction force through the cylinder, enabling rapid unloading of goods.

[0003] Conventional freight rail transit bottom door frames are made of steel structures. The alternative is an aluminum alloy structure, which offers the advantage of being lighter than carbon steel, increasing the overall cargo load capacity. The aluminum alloy bottom door frame is a double-layer frame structure. After assembly and welding, the gap between the bottom door panels and the frame is required to be 0-0.7mm. Because aluminum alloy materials deform significantly after welding, controlling the deformation is difficult. The current standard practice for welding bottom door frames is as follows: two separate single-layer structural fixtures are fabricated, and the crossbeams and roller supports are welded together. After welding, the flatness is adjusted. Then, the welded crossbeams and roller supports are placed into the second assembly fixture, and the entire frame is welded.

[0004] After the aluminum alloy bottom door frame is fixed with tooling, it needs to be lifted and rotated with the assistance of an overhead crane. Since the aluminum alloy bottom door frame has a certain mass, the fixing devices such as the fixing brackets set at the edge of the tooling are not enough to fully fix the various structures of the door frame, which leads to weld deformation during the welding rotation process and causes errors in the rapid welding process. This is inadequate from the perspectives of cost, efficiency and quality risk. Utility Model Content

[0005] To address the aforementioned deficiencies, the present invention aims to provide a welding fixture for a vehicle underbody door frame, thereby solving the problems mentioned in the background art. The device includes an outer frame and a fixture assembly mounted on the outer frame. Positioning end seats are installed on both sides of the outer frame in the transverse direction. Several frame support beams are provided inside the outer frame along the transverse and longitudinal directions. The fixture assembly includes several helical pressure arms and helical push arms mounted on the outer frame, as well as several vertical clamps mounted on the frame support beams.

[0006] Furthermore, several vertical clamps are arranged on the frame support beams along the transverse direction of the outer frame.

[0007] Furthermore, the vertical clamp includes a support platform with an internal cavity, a platform support is installed on the top of the support platform, and a bracket is installed at both ends of the platform support. A U-shaped curved arm is detachably connected to the platform support by a screw, and the rotation of the screw can drive the U-shaped curved arm to move downward.

[0008] Furthermore, the screw is threadedly connected to the platform support, and a rotating part that can abut against the U-shaped curved arm is fixedly connected to the top of the screw.

[0009] Furthermore, both ends of the U-shaped bend are fixedly connected to clamping blocks, and the bottom of the clamping blocks is equipped with pads.

[0010] Furthermore, the platform support has a threaded hole at its center that extends into the cavity inside the support platform, and the U-shaped curved arm has a reserved hole at its center for cooperating with the screw, with one side of the reserved hole open.

[0011] Furthermore, the outer frame has several helical pressure arms on one end along the width direction, and several helical push arms and several helical pressure arms on the other two ends along the width direction.

[0012] Furthermore, the spiral pressure arm includes a hinged seat mounted on the outer frame via a support portion, a hinged arm hingedly connected to the hinged seat, and a pressing mechanism with the output end facing downward and a pressing mechanism with the output end facing the support portion provided on the hinged arm.

[0013] Furthermore, the spiral push arm includes a support portion and a clamping mechanism mounted on the outer frame via the support portion.

[0014] Furthermore, the clamping mechanism includes a threaded sleeve and a threaded rod threaded inside the threaded sleeve. A rotating part and a pad are respectively installed at both ends of the threaded rod, and a through hole is provided on the rotating part.

[0015] Therefore, this tooling can meet the requirements of overall welding of the bottom door frame for different vehicle models. The welding angle can be switched by the positioner, and the positioning reference can be adjusted arbitrarily by the positioning seat to meet various size requirements. It saves time and labor, and eliminates the need for overhead crane tilting and hoisting for replacement, freeing up overhead crane resources. At the same time, the vertical clamp of this tooling can more firmly fix the bottom door frame to the tooling, providing precise positioning while ensuring sufficient fixation when the positioner tilts, thereby reducing post-weld deformation. This tooling is versatile and can be used in multiple similar aluminum alloy grain hopper bottom door frame production projects. Attached Figure Description

[0016] Figure 1 A three-dimensional schematic diagram of the fixing structure of the tooling and the door frame;

[0017] Figure 2This is a top view of the tooling;

[0018] Figure 3 This is a partial side sectional view of the door frame;

[0019] Figure 4 This is a schematic diagram of a vertical clamp structure;

[0020] Figure 5 This is a schematic diagram showing the installation of the vertical clamp and the door frame beam;

[0021] Figure 6 This is a schematic diagram of the spiral pressure arm structure;

[0022] Figure 7 This is a schematic diagram of the spiral pusher structure;

[0023] In the diagram: 01-Door frame edge; 02-Door frame crossbeam; 1-Outer frame; 11-Support part; 12-Support platform; 13-Clamping mechanism; 2-Frame support beam; 3-Positioning end seat; 4-Screw pressure arm; 41-Hinge seat; 411-Hinge hole; 412-Insertion hole; 42-Hinge arm; 5-Screw push arm; 6-Vertical clamp; 61-Platform support; 610-Screw hole; 62-Support; 63-U-shaped bent arm; 631-Clamping block; 64-Abutment part; 641-Reserved hole; 65-Screw; 651-Rotating part; 66-Padded block. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] It should be noted that, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] Furthermore, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0028] See Figure 1-7 The purpose of this utility model is to provide a welding fixture for the door frame of a vehicle.

[0029] The undercarriage door frame mainly consists of attached Figure 1 The end frame, door frame side panel 01, and door frame crossbeam 02 shown in the diagram require assembly and welding. These components must be individually mounted onto the welding fixture. The fixture's clamping components are used to position, secure, and tighten each component, minimizing deformation errors during welding. Furthermore, the fixture is designed to be mountable to a positioner, allowing it to rotate and reposition, thus addressing angle issues during door frame welding.

[0030] Therefore, this technical solution mainly adopts the design concept of double-layer structure integral displacement welding, while satisfying the compatibility of the left and right door frames.

[0031] The main structure of this technical solution includes an outer frame 1, a positioning end seat 3, a spiral pressure arm 4, a spiral push arm 5, a vertical clamp 6, and a support positioning seat. After manufacturing these components, they are then welded and bolted together onto the outer frame 1. Specifically, the overall displacement welding fixture for the vehicle undercarriage door frame provided by this utility model includes a rectangular outer frame 1 composed of four square tubes. Frame support beams 2 are fixedly connected to the inner side of the outer frame 1 in both the transverse and longitudinal directions; see attached... Figure 2 The top view of the tooling shown has nine frame support beams 2 in the horizontal direction (the length of the overall rectangle of the outer frame 1) and two frame support beams 2 in the vertical direction (the width of the overall rectangle of the outer frame 1). The frame support beams 2 are used to reinforce the overall structure of the tooling, and various clamping tooling components for fixing the door frame of the vehicle can be installed on top of them.

[0032] The outer frame 1 and the frame support beam 2 together form the frame support, while the spiral pressure arm 4, spiral push arm 5, and vertical clamp 6 serve as clamping fixture components (pressurizing devices). Both the frame support and the pressing device are made of carbon steel and mainly fix the external dimensions of components such as the end frame, the frame side 01, and the frame crossbeam 02 of the door frame. The frame support adopts an integrated welded structure to improve its overall rigidity and strength.

[0033] Several support positioning seats are arranged on the frame support beam 2. The support positioning seats are made of aluminum alloy blocks and are used to position and support the end frame and door frame edge 01 on the vehicle bottom door frame. They are used in conjunction with the spiral pressure arm 4 and spiral push arm 5 to fix the horizontal spine of the vehicle bottom door frame, door frame edge 01 and other positions, so as to facilitate the operator's assembly and improve the assembly size quality.

[0034] Several vertical clamps 6 are arranged on the frame support beams 2 along the transverse direction of the outer frame 1 (the length direction of the overall rectangle of the outer frame 1). Regarding the placement of the vertical clamps 6: the vertical clamps 6 should be positioned such that each door frame crossbeam 02 is between two adjacent vertical clamps 6. The vertical clamps 6 simultaneously apply a clamping force towards the tooling to the two adjacent door frame crossbeams 02, further securing the vehicle bottom door frame to the tooling. This reduces the relative displacement deformation between the door frame crossbeam 02 and the end frame and door frame edge 01 when the positioner rotates, while ensuring accurate positioning and a more stable fixation of the vehicle bottom door frame.

[0035] For details, please see the appendix. Figure 3 The partial side sectional view of the door frame shown illustrates that the undercarriage door frame structurally consists of two end frames, two door frame side frames 01, and seven door frame crossbeams 02. Each door frame crossbeam 02 requires reliable welding to both ends of the two door frame side frames 01. The cross-section of each door frame crossbeam 02 structurally includes a flat bottom and a pointed top. The vertical clamp 6 needs to contact the pointed top of the door frame crossbeam 02 when tightening it downwards.

[0036] The vertical clamp 6 includes a support platform 12 mounted on the frame support beam 2. The support platform 12 has an internal cavity, and a platform support 61 is fixedly connected to the top of the support platform 12. Both ends of the platform support 61 are equipped with brackets 62. A U-shaped curved arm 63 is detachably connected to the platform support 61 via a screw 65. A rotating part 651, which can abut downwards against the U-shaped curved arm 63, is fixedly connected to the top of the screw 65. Specifically, the screw 65 and the U-shaped curved arm 63 are rotatable. The screw 62 is threadedly engaged with the platform support 61. When the screw 65 rotates downwards, the rotating part 651 abuts against the top of the U-shaped curved arm 63, causing the U-shaped curved arm 63 to press downwards against the door frame beam 02. Furthermore, both ends of the U-shaped curved arm 63 are fixedly connected with pressing blocks 631. A pad 66, which matches the shape of the top tip of the door frame beam 02, is installed at the bottom of the pressing block 631.

[0037] Preferably, the platform support 61 has a threaded hole 610 at its center that extends into the internal cavity of the support platform 12, and the U-shaped arm 63 has a reserved hole 641 at its center for engagement with the screw 62. The reserved hole 641 is open on one side, which makes it easier to install, disassemble, and collect the U-shaped arm 63.

[0038] This technical solution includes the following key technical points:

[0039] 1. The outer frame 1 has positioning end seats 3 fixedly connected to both sides in the horizontal direction; the positioning end seats 3 can be fixedly connected to the output end of the positioner by bolts. The output end of the positioner can drive the entire fixture to rotate by fixing it to the positioning end seats 3.

[0040] 2. The outer frame 1 has two bottom frame stops on one side (first position end) in the horizontal direction, and several spiral push arms 5 corresponding to the bottom frame stops on the other side (second position end) of the outer frame 1 in the horizontal direction. The entire bottom door frame is positioned by the bottom frame stops at the first position end. After positioning, the spiral push arms 5 are used to adjust the second position end to require a diagonal error value ≤2mm.

[0041] 3. The outer frame 1 has several spiral pressure arms 4 on one end along the width direction, and several spiral push arms 5 and several spiral pressure arms 4 on the other end along the width direction; the bottom door frame is positioned by spiral pressure arms 4 on one end along the width direction, and adjusted by spiral push arms 5 on the other end along the width direction, with a dimensional error requirement of ±2mm.

[0042] 4. The outer frame 1 and the frame support beam 2 form an integral carbon steel thick plate structure with a total length of 3760mm and material of Q235, which improves the bending and deformation resistance of the bottom door frame. The positioning end seats 3 on both sides of the overall tooling are made of square ultra-thick plates with reserved holes for easy installation on the positioner.

[0043] 5. The flatness of the mounting base of the bottom door frame is ensured by integral machining to ensure consistent height. This structural design ensures that it does not interfere with other components while also guaranteeing the stability of the structure.

[0044] 6. The support positioning seat is set on the frame support beam 2. The support positioning seat adopts high-strength support and high wear-resistant aluminum block with a specification of 100*100*40mm. The bottom slot is processed to the width required by the drawing, and the depth is reserved 5mm to facilitate the removal of the die after welding. The upper part is made of a contoured aluminum block and bolts are used to fasten it to prevent movement.

[0045] Preferably, the spiral pressure arm 4 includes a hinge seat 41 mounted on the outer frame 1 via a support 11, and a hinge arm 42 is hingedly connected to the hinge seat 41. The hinge arm 42 is provided with a pressing mechanism 13 with the output end facing downward and a pressing mechanism 13 with the output end facing the support 11.

[0046] Preferably, the hinge base 41 is provided with a hinge hole 411 and a insertion hole 412, and one end of the hinge arm 42 is provided with a first through hole and a second through hole corresponding to the hinge hole 411 and the insertion hole 412, respectively. The first through hole is hinged to the hinge hole 411 through a hinge bolt, so that the hinge arm 42 can rotate around the hinge hole 411 to engage or disengage. The second through hole is inserted into the insertion hole 412 through a insertion bolt, which is used to restrict the rotation of the hinge arm 42. When the rotation of the hinge arm 42 is restricted, the door frame edge 01 can be horizontally pressed and positioned by the pressing mechanism 13 with its output end facing the support part 11, and then vertically pressed and positioned by the pressing mechanism 13 with its output end facing downward.

[0047] Preferably, the spiral push arm 5 includes a support portion 11 and a clamping mechanism 13 mounted on the outer frame 1 via the support portion 11. The clamping mechanism 13 is parallel to the plane of the outer frame 1.

[0048] Preferably, the clamping mechanism 13 includes a threaded sleeve and a threaded rod threaded inside the threaded sleeve. A rotating part and a pad are fixedly connected to both ends of the threaded rod, and the rotating part has a through hole. The pad is the output end of the clamping mechanism 13. The operator can insert a pin into the through hole to rotate the threaded rod, thereby causing the pad to press against the door frame edge 01 of the vehicle's undercarriage door frame, thus achieving a clamping effect.

[0049] Therefore, after the aluminum alloy bottom door frame is fixed with tooling, it needs to be lifted and rotated with the assistance of an overhead crane. Since the aluminum alloy bottom door frame has a certain mass, the fixing devices such as the fixing brackets set on the edge of the tooling are not enough to fully fix the various structures of the door frame, which leads to weld deformation during the welding reversal process and causes errors in the rapid welding process. This is inadequate from the perspectives of cost, efficiency and quality risk.

[0050] Therefore, this tooling can meet the requirements of overall welding of the bottom door frame for different vehicle models. The welding angle can be switched by the positioner, and the positioning reference can be adjusted arbitrarily by the positioning seat to meet various size requirements. It saves time and labor, and eliminates the need for overhead crane tilting and hoisting for replacement, freeing up overhead crane resources. At the same time, the vertical clamp of this tooling can more firmly fix the bottom door frame to the tooling, providing precise positioning while ensuring sufficient fixation when the positioner tilts, thereby reducing post-weld deformation. This tooling is versatile and can be used in multiple similar aluminum alloy grain hopper bottom door frame production projects.

[0051] Of course, there may be other embodiments of this utility model. Without departing from the spirit and essence of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, but these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model.

Claims

1. A welding fixture for a vehicle underbody door frame, characterized in that, The device includes an outer frame (1) and a fixture assembly mounted on the outer frame (1). The outer frame (1) has positioning end seats (3) mounted on both sides in the transverse direction. The outer frame (1) has several frame support beams (2) arranged in the transverse and longitudinal directions. The fixture assembly includes several spiral pressure arms (4) and spiral push arms (5) arranged on the outer frame (1), and several vertical clamps (6) arranged on the frame support beams (2).

2. The welding fixture for the vehicle undercarriage door frame according to claim 1, characterized in that, Several vertical clamps (6) are arranged on the frame support beams (2) along the transverse direction of the outer frame (1).

3. The welding fixture for the vehicle undercarriage door frame according to claim 1, characterized in that, The vertical clamp (6) includes a support platform (12) with an internal cavity. A platform support (61) is installed on the top of the support platform (12). A bracket (62) is installed at both ends of the platform support (61). A U-shaped curved arm (63) is detachably connected to the platform support (61) by a screw (65). The rotation of the screw (65) can drive the U-shaped curved arm (63) to move downward.

4. The welding fixture for the vehicle undercarriage door frame according to claim 3, characterized in that, The screw (65) is threadedly connected to the platform support (61), and the top of the screw (65) is fixedly connected to a rotating part (651) that can abut against the U-shaped arm (63) downwards.

5. The welding fixture for the vehicle undercarriage door frame according to claim 3, characterized in that, Both ends of the U-shaped bend (63) are fixedly connected to clamping blocks (631), and a pad (66) is installed at the bottom of the clamping block (631).

6. The welding fixture for the vehicle undercarriage door frame according to claim 3, characterized in that, The platform support (61) has a screw hole (610) at its center that extends into the cavity inside the support platform (12), and the U-shaped arm (63) has a reserved hole (641) at its center that is designed to cooperate with the screw (65). The reserved hole (641) is open on one side.

7. The welding fixture for the vehicle undercarriage door frame according to claim 1, characterized in that, The outer frame (1) has several spiral pressure arms (4) on one end along the width direction, and several spiral push arms (5) and several spiral pressure arms (4) on the other two ends along the width direction.

8. The welding fixture for the vehicle undercarriage door frame according to claim 7, characterized in that, The spiral pressure arm (4) includes a hinge seat (41) mounted on the outer frame (1) via a support (11). A hinge arm (42) is hinged to the hinge seat (41). The hinge arm (42) is provided with a pressing mechanism (13) with its output end facing downward and a pressing mechanism (13) with its output end facing the support (11).

9. The welding fixture for the vehicle undercarriage door frame according to claim 7, characterized in that, The spiral push arm (5) includes a support part (11) and a clamping mechanism (13) mounted on the outer frame (1) via the support part (11).

10. The welding fixture for the vehicle undercarriage door frame according to claim 8 or 9, characterized in that, The clamping mechanism (13) includes a threaded sleeve and a threaded rod threaded inside the threaded sleeve. A rotating part and a pad are respectively installed at both ends of the threaded rod, and a through hole is provided on the rotating part.

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