Welding fixture for flexibly rolling and clamping frame

Abstract

The invention relates to a welding fixture for flexibly rolling and clamping a frame. The welding fixture comprises a bottom plate, a plurality of clamping mechanisms fixedly arranged on the bottom plate, and driving mechanisms symmetrically arranged on the bottom plate, the clamping mechanism comprises a base fixedly arranged on the bottom plate, a threaded rod rotationally arranged on the base, a first gear fixedly arranged at one end of the threaded rod, first sliding grooves symmetrically and fixedly formed in the base, first sliding blocks arranged in the first sliding grooves in a sliding mode and meshed with the threaded rod, and second sliding blocks arranged in the first sliding grooves in a sliding mode and meshed with the threaded rod. The first sliding grooves are symmetrically and fixedly formed in the base, the second sliding grooves are symmetrically and fixedly formed in the base, the first clamping assemblies are arranged on the second sliding grooves in a sliding mode, the second clamping assemblies are arranged on the second sliding grooves in a sliding mode, and the racks are symmetrically and fixedly arranged on the second sliding grooves.

Description

Technical Field

[0001] This invention relates to the field of motorcycle clamping technology, and more specifically to a flexible roll forming welding clamp for holding a motorcycle frame. Background Technology

[0002] Motorcycle frames are manufactured by welding multiple steel pipes together. During welding, these pipes are clamped in a fixture and then welded using a robotic arm. Existing welding fixtures consist of multiple clamping components mounted at different positions on a base to hold different types of motorcycle frames. Different motorcycle frames require different diameter steel pipes, and even within the same frame, the diameter of the pipes varies at different locations, resulting in varying clamping strokes and clamping forces. Current fixtures require manual programming and adjustment of the clamping stroke of each component, which is cumbersome. Therefore, a welding fixture that can automatically adapt to the clamping stroke is needed. Summary of the Invention

[0003] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0004] To address the technical problems mentioned in the background section, some embodiments of this application provide a welding fixture for a flexible roll-pressed clamping frame, including a base plate, multiple clamping mechanisms fixedly mounted on the base plate, and a drive mechanism symmetrically mounted on the base plate. The clamping mechanism includes a base fixedly mounted on the base plate, a threaded rod rotatably mounted on the base, a first gear fixedly mounted on one end of the threaded rod, a first slide groove symmetrically fixedly mounted on the base, a first slider slidably mounted on the first slide groove and meshing with the threaded rod, a second slider slidably mounted on the first slide groove and meshing with the threaded rod, a second slide groove symmetrically fixedly mounted on the base, a first clamping assembly slidably mounted on the second slide groove, a second clamping assembly slidably mounted on the second slide groove, and a rack symmetrically fixedly mounted on the second slide groove.

[0005] Specifically, the drive mechanism includes a motor fixedly mounted on a base plate, multiple transmission rods, multiple second gears mounted on the transmission rods, and multiple separation components mounted on the second gears and transmission rods; the multiple transmission rods are connected by couplings.

[0006] Specifically, the first clamping assembly includes a first clamping seat slidably disposed on the second slide groove, a pressure device disposed on the first clamping seat, a connecting device disposed on the first clamping seat, and a rotating device disposed on the first clamping seat.

[0007] Specifically, the pressure device includes a third slide groove fixedly mounted on the first clamping seat, a pressure block slidably mounted on the third slide groove, a first spring fixed at one end on the pressure block and at the other end on the first clamping seat, a first airbag fixedly mounted on the third slide groove and in contact with the pressure block, a second airbag fixedly mounted on the first clamping seat, a first hose connected at one end to the first airbag and at the other end to the second airbag, and a second hose connected at one end to the first airbag and at the other end to the second airbag.

[0008] Specifically, the connecting device includes a fourth slide groove symmetrically fixed on the first clamping seat, a third slider slidably disposed on the fourth slide groove, a fifth slide groove fixed on the first clamping seat, a connecting block slidably disposed on the fifth slide groove, a connecting rod with one end rotatably disposed on the connecting block and the other end rotatably disposed on the second slider, a connecting head fixed on the connecting block, and a connecting groove disposed on the first slider.

[0009] Specifically, the rotating device includes a hydraulic cylinder fixedly mounted on the first clamping seat, a bracket fixedly mounted on the first clamping seat, a telescopic rod rotatably mounted on the hydraulic cylinder and the bracket, and a pressure roller fixedly mounted on one end of the telescopic rod.

[0010] Specifically, the separation assembly includes a meshing groove symmetrically fixed on the second gear, a meshing head slidably disposed on the transmission rod and the meshing groove, and a second spring with one end fixed on the meshing head and the other end fixed on the transmission rod.

[0011] Specifically, the second clamping assembly has the same structure as the first clamping assembly; the first clamping assembly and the second clamping assembly are connected by a third flexible hose.

[0012] The beneficial effects of this invention are: (1) The drive mechanism in this invention can uniformly control all clamping mechanisms on one side, without the need to program and control each clamping mechanism, which shortens the preparation time of the fixture before welding and improves the efficiency of frame welding.

[0013] (2) The existing clamping seat is semi-circular. When clamping frame steel pipes of different diameters, the clamping seat needs to be disassembled and replaced. The inclined surface of the first clamping seat can adapt to frame steel pipes of different diameters, has good versatility, does not need to be replaced, and improves the welding efficiency of the frame.

[0014] (3) The clamping method used in this invention can ensure that the clamping force of each clamping point of each frame is equal, and there is no need to use electronic components such as sensors, which reduces the cost.

[0015] (4) Another advantage of this invention is that the steel pipe can be centered during the movement of the first clamping seat. When the steel pipe of the frame is placed, it is close to the first clamping seat and away from the second clamping component. During the movement, the first clamping seat contacts the frame first. If the third hose is not provided, the first airbag of the first clamping component will be fully compressed at this time, and the second airbag will push the third slider to mesh with the rack. The first clamping seat will be fixed, while the second clamping component will not contact the frame at this time and cannot achieve clamping. However, with the third hose, even if the first airbag in the first clamping component is fully compressed first, the gas in the first airbag of the first clamping component and the second airbag of the second clamping component are connected by the third hose. The gas in the first airbag of the first clamping component alone is not enough to fully inflate the two second airbags. Therefore, the first clamping seat will not be fixed and can push the steel pipe to move. Only when the first airbags in the first clamping component and the second clamping component are fully compressed will they be fixed. At this time, the steel pipe of the frame will also be pushed to center. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.

[0017] Furthermore, throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements are not necessarily drawn to scale.

[0018] In the attached diagram: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a top view of the clamping mechanism in this invention; Figure 3 for Figure 2 A cross-sectional view of AA; Figure 4 for Figure 3 A line section view of BB; Figure 5 for Figure 3 A magnified view of a section at point C; Figure 6 for Figure 3 A line section view of DD; Figure 7 for Figure 3 A line section of the EE; Figure 8 This is a top view of a portion of the drive mechanism structure of the present invention; Figure 9 for Figure 8 Linear section of FF. Detailed Implementation

[0019] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0020] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0021] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0022] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0023] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0024] Reference Figures 1-9As shown, the flexible roll forming clamping welding fixture of the present invention includes a base plate 1, multiple clamping mechanisms 2 fixedly mounted on the base plate, and a drive mechanism 3 symmetrically mounted on the base plate. Each clamping mechanism includes a base 21 fixedly mounted on the base plate, a threaded rod 22 rotatably mounted on the base, a first gear 23 fixedly mounted on one end of the threaded rod, a first slide groove 24 symmetrically fixed on the base, a first slider 25 slidably mounted in the first slide groove and meshing with the threaded rod, a second slider 26 slidably mounted in the first slide groove and meshing with the threaded rod, a second slide groove 27 symmetrically fixed on the base, a first clamping assembly 28 slidably mounted in the second slide groove, a second clamping assembly 29 slidably mounted in the second slide groove, and a rack 20 symmetrically fixed on the second slide groove. The base plate is fixed to the ground. Multiple clamping mechanisms are provided for clamping the frame tubes to be welded. There is a certain distance between the clamping mechanisms to allow room for the welding arm; the drive mechanism is used to drive each clamping mechanism to work. Compared with the prior art, where each clamping mechanism needs to be controlled separately, the drive mechanism in this invention can control all clamping mechanisms on one side in a unified manner, without the need for programming control of each clamping mechanism, shortening the preparation time of the fixture before welding and improving the efficiency of frame welding; the base is fixed to the base plate with bolts, and the position of the base on the base plate can be adjusted according to the shape of the frame and the position of the steel pipe; the first gear is a bevel gear, and the rotation of the first gear can drive the threaded rod to rotate, thereby causing the first slider and the second slider to move towards each other, thereby driving the first clamping assembly and the second clamping assembly to move towards each other, clamping both sides of the steel pipe; the rack is used to fix the first clamping assembly and the second clamping assembly. In the initial state, the rack does not contact the first clamping assembly and the second clamping assembly.

[0025] Specifically, the drive mechanism includes a motor 31 fixedly mounted on the base plate, multiple transmission rods 32, multiple second gears 36 mounted on the transmission rods, and multiple separation components 34 mounted on the second gears and transmission rods. The multiple transmission rods are connected by couplings 35. When the motor is working, it can drive the transmission rods to move. The transmission rods can be driven by the couplings, which are universal couplings, a prior art technology. Therefore, adjacent transmission rods can be bent at a certain angle according to the needs of frame welding, corresponding to the bent parts at the front and rear ends of the frame. The separation components can separate the transmission rods from the second gears. Since the diameter of the steel pipes may not be exactly the same when the frame is welded, some clamping mechanisms may have already clamped the frame while the other clamping components have not yet fully clamped it. Therefore, separation components are needed to separate the clamping mechanisms that have already been clamped, so that the other clamping mechanisms can continue to clamp.

[0026] Specifically, the first clamping assembly includes a first clamping seat 281 slidably disposed on the second slide groove, a pressure device 282 disposed on the first clamping seat, a connecting device 283 disposed on the first clamping seat, and a rotating device 284 disposed on the first clamping seat. The first clamping seat has an inclined surface. Existing clamping seats are semi-circular, and need to be disassembled and replaced when clamping frame steel pipes of different diameters. However, the inclined surface of the first clamping seat can adapt to frame steel pipes of different diameters, has good versatility, does not need to be replaced, and improves the frame welding efficiency. The pressure device can be used to determine whether the first clamping seat fully clamps the frame. The connecting device is used to connect the first clamping seat and the first slider. The rotating device clamps the frame from an obliquely above.

[0027] Specifically, the pressure device includes a third slide groove 2821 fixedly mounted on the first clamping seat, a pressure block 2822 slidably mounted on the third slide groove, a first spring 2823 fixed at one end on the pressure block and at the other end on the first clamping seat, a first airbag 2824 fixedly mounted on the third slide groove and in contact with the pressure block, a second airbag 2825 fixedly mounted on the first clamping seat, a first hose 2826 connected at one end to the first airbag and at the other end to the second airbag, and a second hose 2827 connected at one end to the first airbag and at the other end to the second airbag; the first spring has a very small elastic coefficient and is only used for resetting the pressure block; in the initial state, the first airbag and the second airbag are filled with gas; the gas in the first airbag can enter the second airbag through the second hose. Within the airbag, an electrically controlled valve is installed in the first hose, which can be used to reset the first and second airbags. The second airbag has corrugated lines and can only expand to both sides. The pressure block slides along the third slide groove. When the frame contacts the pressure block, the pressure block will slide on the third slide groove, and at the same time, the first spring is stretched, the first airbag is compressed, and the gas in it enters the second airbag along the second hose, causing the second airbag to expand. During reset, the electrically controlled valve opens, and the gas in the second airbag flows back into the first airbag, working with the first spring to reset the pressure block. During reset, the first slider passes through the first clamping seat, pushing the connector wire upward. When the connector is aligned with the connecting groove, it will automatically fall into the connecting groove. At this time, the first slider connects with the first clamping seat, and the first slider drives the first clamping seat to reset.

[0028] Specifically, the connecting device includes a fourth slide groove 2831 symmetrically fixed on the first clamping seat, a third slider 2832 slidably disposed on the fourth slide groove, a fifth slide groove 2833 fixed on the first clamping seat, a connecting block 2834 slidably disposed on the fifth slide groove, a connecting rod 2835 rotatably disposed on the connecting block at one end and on the second slider at the other end, a connecting head 2836 fixed on the connecting block, and a connecting groove 2837 disposed on the first slider; the third slider is connected to the second airbag, and when the second airbag inflates, it will push the third slider to both sides; in the initial state, the third slider is located in the first clamping seat, and the connecting head is in contact with the connecting groove. When the frame is clamped, the pressure block... The steel pipe compresses the gas in the first airbag, forcing it into the second airbag. The second airbag inflates, pushing the third sliders on both sides outward. After moving, the third sliders move upward via a connecting rod, causing the connecting block and connector to disengage from the first slider. At this point, the first clamping seat disengages from the first slider, and the third slider moves outward. It is not yet engaged with the rack. Only when the first airbags on both sides are fully compressed can the air pressure in the second airbag push the third slider to engage with the rack, fixing the first clamping seat and thus completing the clamping of the frame steel pipe. The clamping method used in this invention can ensure that the clamping force at each clamping point of each frame is equal, and it does not require the use of electronic components such as sensors, resulting in lower costs.

[0029] Specifically, the rotating device includes a hydraulic cylinder 2841 fixedly mounted on the first clamping seat, a bracket 2842 fixedly mounted on the first clamping seat, a telescopic rod 2843 rotatably mounted on the hydraulic cylinder and the bracket, and a pressure roller 2844 fixedly mounted on one end of the telescopic rod. The operation of the hydraulic cylinder drives the telescopic rod to rotate, which in turn drives the pressure roller to clamp the steel pipe of the frame. The pressure roller clamps from above, and the first clamping seat clamps from below, ensuring that the frame is clamped securely.

[0030] Specifically, the separation assembly includes a meshing groove 341 symmetrically fixed on the second gear, a meshing head 342 slidably disposed on the transmission rod and the meshing groove, and a second spring 343 with one end fixed on the meshing head and the other end fixed on the transmission rod. Since the steel pipe diameter used in the frame is different, the length of the threaded rod used in each clamping mechanism is also different, but they are all driven by the transmission rod. Therefore, some clamping mechanisms may have completed clamping, while others have not yet completed clamping. At this time, the separation assembly can separate the clamping mechanism that has completed clamping. That is, when the transmission rod rotates, the first slider is blocked by the partition on the base and cannot continue to move, causing the second gear to squeeze the meshing head, causing the meshing head to disengage from the meshing groove. The transmission rod can still continue to rotate, while the second gear does not rotate. Since the first clamping seat and the first slider have disengaged from each other through the connecting device when clamping is completed, it will not affect the clamping of the frame.

[0031] Specifically, the second clamping assembly has the same structure as the first clamping assembly; the first clamping assembly and the second clamping assembly are connected by a third flexible hose 4; a partition is provided in the middle of the base, and a groove is provided on the partition to allow space for the third flexible hose. The third flexible hose is used to connect the second airbags on both sides, so that the air pressure of the second airbags and the first airbags on both sides is balanced, and the connectors on both sides can move synchronously; the advantage of this design in this invention is that during the movement of the first clamping seat, the steel pipe can be centered. When the frame steel pipe is placed, it is close to the first clamping seat and away from the second clamping assembly. During the movement, the first clamping seat contacts the frame first. If the third flexible hose is not provided, the first clamping assembly's first clamping assembly will then... One airbag has been fully compressed, the second airbag pushes the third slider to engage with the rack, the first clamping seat is fixed, and the second clamping assembly has not yet contacted the frame and cannot clamp; however, with the third hose, even if the first airbag in the first clamping assembly is fully compressed first, because the second airbags of the first and second clamping assemblies are connected by the third hose, the gas in the first airbag of the first clamping assembly alone is not enough to fully inflate the two second airbags, so the first clamping seat will not be fixed and can push the steel tube to move. Only when the first airbags in the first and second clamping assemblies are fully compressed will they be fixed, at which point the frame steel tube will also be pushed to the center.

[0032] The above descriptions are merely some preferred embodiments of the present disclosure and illustrate the underlying technical principles. Those skilled in the art should understand that the scope of the invention encompassed by the embodiments of the present disclosure is not limited to technical solutions formed by specific combinations of the aforementioned technical features. It also encompasses other technical solutions formed by any combination of the aforementioned technical features or their equivalents, without departing from the aforementioned inventive concept. For example, a technical solution formed by replacing the aforementioned features with (but not limited to) technical features with similar functions disclosed in the embodiments of the present disclosure.

Claims

1. A welding fixture for a flexible roll-pressed vehicle frame, characterized in that: The device includes a base plate, multiple clamping mechanisms fixedly mounted on the base plate, and a drive mechanism symmetrically mounted on the base plate. The clamping mechanism includes a base fixedly mounted on the base plate, a threaded rod rotatably mounted on the base, a first gear fixedly mounted on one end of the threaded rod, a first slide groove symmetrically fixedly mounted on the base, a first slider slidably mounted on the first slide groove and meshing with the threaded rod, a second slider slidably mounted on the first slide groove and meshing with the threaded rod, a second slide groove symmetrically fixedly mounted on the base, a first clamping assembly slidably mounted on the second slide groove, a second clamping assembly slidably mounted on the second slide groove, and a rack symmetrically fixedly mounted on the second slide groove.

2. The welding fixture for a flexible roll-pressed vehicle frame according to claim 1, characterized in that: The drive mechanism includes a motor fixedly mounted on a base plate, multiple transmission rods, multiple second gears mounted on the transmission rods, and multiple separation components mounted on the second gears and transmission rods; the multiple transmission rods are connected by couplings.

3. The welding fixture for a flexible roll-pressed vehicle frame according to claim 1, characterized in that: The first clamping assembly includes a first clamping seat slidably disposed on a second slide groove, a pressure device disposed on the first clamping seat, a connecting device disposed on the first clamping seat, and a rotating device disposed on the first clamping seat.

4. The welding fixture for a flexible roll-pressed vehicle frame according to claim 3, characterized in that: The pressure device includes a third slide groove fixedly mounted on a first clamping seat, a pressure block slidably mounted on the third slide groove, a first spring fixed at one end on the pressure block and at the other end on the first clamping seat, a first airbag fixedly mounted on the third slide groove and in contact with the pressure block, a second airbag fixedly mounted on the first clamping seat, a first hose connected at one end to the first airbag and at the other end to the second airbag, and a second hose connected at one end to the first airbag and at the other end to the second airbag.

5. The welding fixture for a flexible roll-pressed vehicle frame according to claim 4, characterized in that: The connecting device includes a fourth slide groove symmetrically fixed on the first clamping seat, a third slider slidably disposed on the fourth slide groove, a fifth slide groove fixed on the first clamping seat, a connecting block slidably disposed on the fifth slide groove, a connecting rod with one end rotatably disposed on the connecting block and the other end rotatably disposed on the second slider, a connecting head fixed on the connecting block, and a connecting groove disposed on the first slider.

6. The welding fixture for a flexible roll-pressed vehicle frame according to claim 3, characterized in that: The rotating device includes a hydraulic cylinder fixedly mounted on a first clamping seat, a bracket fixedly mounted on the first clamping seat, a telescopic rod rotatably mounted on the hydraulic cylinder and the bracket, and a pressure roller fixedly mounted on one end of the telescopic rod.

7. The welding fixture for a flexible roll-pressed vehicle frame according to claim 2, characterized in that: The separation assembly includes a meshing groove symmetrically fixed on the second gear, a meshing head slidably disposed on the transmission rod and the meshing groove, and a second spring with one end fixed on the meshing head and the other end fixed on the transmission rod.

8. The welding fixture for a flexible roll-pressed vehicle frame according to claim 1, characterized in that: The second clamping assembly has the same structure as the first clamping assembly; the first clamping assembly and the second clamping assembly are connected by a third flexible hose.

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