A forming device for a flat tube

Abstract

The utility model relates to a kind of forming device of flat round tube, including forming equipment, the back of forming equipment is fixedly installed with fixed box, motor is fixedly installed in the inside of fixed box, worm is rotatably installed in the inside of fixed box, worm wheel is rotatably installed in the inside of fixed box, adjusting rod is fixedly installed on the outside of worm wheel, driven rod is hinged on the outside of adjusting rod, clamping plate is fixedly installed on the outside of driven rod, limit rod is hinged on the outside of fixed box.This forming device of flat round tube drives two worm wheels to rotate synchronously, through the hinged structure of adjusting rod and driven rod, two clamping plates realize symmetrical opening and closing movement, the design does not need to replace mould, only needs to adjust motor speed or steering, can quickly change the distance between clamping plate, to adapt to the production demand of different long axis, short axis proportion flat round tube, significantly shorten mould changing time, ensure that pipe material is stressed evenly.

Description

Technical Field

[0001] This utility model relates to the field of flat round tube processing technology, specifically a flat round tube forming device. Background Technology

[0002] Flat round tubes, also known as elliptical tubes or flat elliptical steel tubes, are a type of metal tube with an elliptical cross-section (the major axis is much larger than the minor axis, and it is flattened). Flat round tube processing is the process of transforming round tubes into tubes with a flat circular (or approximately elliptical) cross-section through specific processes. The core of this process lies in controlling the flow of metal through die extrusion or rolling to achieve a precise conversion of the cross-sectional shape.

[0003] A search revealed a flattened tube forming device disclosed in Chinese Utility Model Patent No. CN218798563U. This utility model patent includes an upper mold, a lower mold, and a support base. A top seat is positioned on the top of the support base, and a drive motor is positioned at the upper center of the top seat. A lifting rod is movably connected between the drive motor and the upper mold. A guide rod is movably connected between the top seat and the upper mold. A tube body is disposed between the upper mold and the lower mold. A first mounting base is positioned at one end of the lower mold, and a first necking device is mounted on the first mounting base. A first telescopic frame is connected to the inner side of the first necking device, and a first diameter reduction structure is connected to the first telescopic frame. A second mounting base is positioned at the other end of the lower mold. The flattened tube forming device of this utility model can form the flattened part of the product in one go, resulting in a beautiful shape, improving processing efficiency, and saving production costs.

[0004] Based on the above comparative structure, it was found that traditional forming devices generally suffer from structural limitations, leading to inflexible adjustment and difficulty in controlling forming accuracy. Most devices rely on fixed molds or a single drive mechanism to achieve cross-sectional shape transformation. For example, they directly extrude round tubes by closing the upper and lower mold cavities, or use hydraulic cylinders to drive the molds for unidirectional pressing. However, such designs have significant drawbacks: on the one hand, the mold cavity size is fixed. If it is necessary to produce flat round tubes with different long and short axis ratios, the entire set of molds must be replaced, resulting in long downtime and low production efficiency. On the other hand, a single drive mechanism (such as a hydraulic cylinder or drive motor) can only adjust the axial reduction amount and cannot dynamically control the direction of metal flow during the rolling process, which can easily cause quality problems such as excessive symmetry of the flat round tube cross-section and uneven wall thickness. Therefore, a forming device for flat round tubes is proposed to solve the above problems. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a forming device for flat round tubes, which has the advantages of being adaptable to processing round tubes of various sizes. It solves the problems of structural limitations in traditional forming devices, which, according to the above-mentioned comparative structure, lead to inflexible adjustment and difficulty in controlling forming accuracy. Most devices rely on fixed molds or a single drive mechanism to achieve cross-sectional shape conversion, such as directly extruding round tubes by closing the upper and lower mold cavities, or using a hydraulic cylinder to drive the mold for unidirectional pressing. However, such designs have significant drawbacks: on the one hand, the mold cavity size is fixed, and if flat round tubes with different long and short axis ratios need to be produced, the entire set of molds must be replaced, resulting in long equipment downtime and low production efficiency; on the other hand, a single drive mechanism (such as a hydraulic cylinder or drive motor) can only achieve axial reduction adjustment and cannot dynamically control the direction of metal flow during the rolling process, which easily causes quality problems such as excessive symmetry of the flat round tube cross-section and uneven wall thickness.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a flat round tube forming device, including a forming equipment, wherein an extrusion structure is installed on the back of the forming equipment; The extrusion structure includes a fixed box, which is fixedly installed on the back of the molding equipment. A motor is fixedly installed inside the fixed box, a worm gear is rotatably installed inside the fixed box, a worm wheel is rotatably installed inside the fixed box, an adjusting rod is fixedly installed outside the worm wheel, a driven rod is hinged to the outside of the adjusting rod, a clamping plate is fixedly installed outside the driven rod, and a limit rod is hinged to the outside of the fixed box.

[0007] Furthermore, the output shaft of the motor is fixedly connected to the worm gear, and there are two worm wheels.

[0008] Furthermore, the worm is located between and meshes with the two worm wheels, and the adjusting rod passes through the fixed box and extends to the outside of the fixed box.

[0009] Furthermore, the other end of the limiting rod is hinged to the driven rod, and there are two clamping plates.

[0010] Furthermore, the inner wall of the molding equipment is provided with a sliding groove, a slider is slidably installed inside the sliding groove, a connecting rod is hinged to the outside of the slider, an arc plate is hinged to the outside of the connecting rod, and an electric telescopic rod is fixedly installed on the inner wall of the molding equipment.

[0011] Furthermore, an installation ring is fixedly installed on the inner wall of the molding equipment, and a flame nozzle is installed on the inner ring of the installation ring. The installation ring is located behind the arc-shaped plate.

[0012] Compared with the prior art, the technical solution of this application has the following beneficial effects: The forming device for this flat round tube uses a motor-driven worm gear to rotate, which in turn drives two worm wheels to rotate synchronously. Through the hinge structure of the adjusting rod and the driven rod, the clamping plates on both sides can achieve symmetrical opening and closing movements. This design eliminates the need to change the mold; only the motor speed or direction needs to be adjusted to quickly change the clamping plate spacing. This adapts to the production needs of flat round tubes with different long and short axis ratios, significantly shortens the mold change time, ensures uniform stress on the tube, controls the symmetry of the flat round tube cross-section within the range of 0.1 mm, and significantly improves the uniformity of wall thickness. Attached Figure Description

[0013] Figure 1 This is a three-dimensional view of the structure of this utility model; Figure 2 This is a cross-sectional view of the extrusion structure of this utility model; Figure 3 This is an internal sectional view of the molding equipment of this utility model; Figure 4 This is a perspective view of the mounting ring of this utility model.

[0014] In the diagram: 1. Molding equipment; 2. Extrusion structure; 201. Fixing box; 202. Motor; 203. Worm gear; 204. Worm wheel; 205. Adjusting rod; 206. Driven rod; 207. Clamping plate; 208. Limiting rod; 3. Linking rod; 4. Arc plate; 5. Electric telescopic rod; 6. Mounting ring; 7. Flame nozzle. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1-4 The forming device for a flat round tube in this embodiment includes a forming device 1, and an extrusion structure 2 is installed on the back of the forming device 1.

[0017] The extrusion structure 2 includes a fixed box 201. The fixed box 201 is fixedly installed on the back of the molding equipment 1. The motor 202 is fixedly installed inside the fixed box 201. The worm gear 203 is rotatably installed inside the fixed box 201. The worm wheel 204 is rotatably installed inside the fixed box 201. The adjusting rod 205 is fixedly installed outside the worm wheel 204. The driven rod 206 is hinged to the outside of the adjusting rod 205. The clamping plate 207 is fixedly installed outside the driven rod 206. The limiting rod 208 is hinged to the outside of the fixed box 201.

[0018] exist Figure 2When the motor 202 starts, the worm gear 203 drives the worm wheel 204 to rotate, which in turn drives the adjusting rod 205 to make arc motion. The rotational force is converted into the linear opening and closing action of the clamping plate 207 through the driven rod 206, so as to realize stepless adjustment of the clamping size.

[0019] exist Figure 3 In the process, when the electric telescopic rod 5 extends or retracts, it pushes the arc plate 4 to rotate around the hinge point of the connecting rod 3. At the same time, the slider 2 moves synchronously in the groove, ensuring that the arc plate 4 always opens and closes symmetrically with the pipe axis as the center. This structure achieves precise positioning and clamping force adjustment of the arc plate 4 on the pipe through displacement control of the electric telescopic rod 5, avoiding positioning deviation caused by elastic decay in traditional spring reset mechanisms.

[0020] exist Figure 4 In the process, before rolling, the electric telescopic rod 5 pushes the arc plate 4 to press the tube, and the tube enters the installation ring 6 area. The flame nozzle 7 preheats the section of the tube to be deformed in an annular shape to soften the metal and reduce the rolling force. After preheating, the tube continues to move backward according to the arc plate 4. At this time, the clamping plate 207 of the extrusion structure 2 completes the flattening of the cross section.

[0021] In summary, the forming device for this flat oval tube utilizes a motor 202 to drive the worm gear 203 to rotate, which in turn drives the two worm wheels 204 to rotate synchronously. Through the hinged structure of the adjusting rod 205 and the driven rod 206, the clamping plates 207 on both sides achieve symmetrical opening and closing movements. This design eliminates the need to change the mold; simply adjusting the speed or direction of the motor 202 quickly changes the spacing between the clamping plates 207, thus adapting to the production needs of flat oval tubes with different long and short axis ratios. This significantly shortens mold change time and improves production efficiency. The double hinged structure of the limiting rod 208, driven rod 206, and adjusting rod 205 forms a stable mechanical transmission path. During rolling, the limiting rod 208 can constrain the movement trajectory of the clamping plates 207 in real time, preventing them from shifting. Simultaneously, the arc plate 4, through the sliding cooperation of the slider and the groove, ensures uniform force on the tube, controlling the symmetry of the flat oval tube cross-section. Within a 0.1 mm range, the wall thickness uniformity is significantly improved, solving the problem that traditional forming devices, as observed in the above comparative structure, generally suffer from structural limitations that lead to inflexible adjustment and difficulty in controlling forming accuracy. Most devices rely on fixed molds or a single drive mechanism to achieve cross-sectional shape transformation, such as directly extruding round tubes by closing the upper and lower mold cavities, or using hydraulic cylinders to drive the molds for unidirectional pressing. However, such designs have significant drawbacks: on the one hand, the mold cavity size is fixed, and if flat round tubes with different long and short axis ratios need to be produced, the entire set of molds must be replaced, resulting in long equipment downtime and low production efficiency; on the other hand, a single drive mechanism, such as a hydraulic cylinder or drive motor, can only achieve axial reduction adjustment and cannot dynamically control the direction of metal flow during the rolling process, which easily causes quality problems such as excessive symmetry of the flat round tube cross-section and uneven wall thickness.

[0022] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A forming apparatus for a flat cylindrical tube, comprising forming equipment (1), characterized in that: The molding equipment (1) has an extrusion structure (2) installed on its back. The extrusion structure (2) includes a fixed box (201). The fixed box (201) is fixedly installed on the back of the molding equipment (1). A motor (202) is fixedly installed inside the fixed box (201). A worm gear (203) is rotatably installed inside the fixed box (201). A worm wheel (204) is rotatably installed inside the fixed box (201). An adjusting rod (205) is fixedly installed outside the worm wheel (204). A driven rod (206) is hinged to the outside of the adjusting rod (205). A clamping plate (207) is fixedly installed outside the driven rod (206). A limit rod (208) is hinged to the outside of the fixed box (201).

2. The forming apparatus for a flat tube according to claim 1, wherein: The output shaft of the motor (202) is fixedly connected to the worm (203), and there are two worm wheels (204).

3. The forming apparatus for a flat tube according to claim 1, wherein: The worm (203) is located between and meshes with the two worm wheels (204), and the adjusting rod (205) passes through the fixed box (201) and extends to the outside of the fixed box (201).

4. The forming apparatus for a flat tube according to claim 1, wherein: The other end of the limiting rod (208) is hinged to the driven rod (206), and there are two clamping plates (207).

5. The forming apparatus for a flat tube according to claim 1, wherein: The molding equipment (1) has a groove on its inner wall, a slider is slidably installed inside the groove, a connecting rod (3) is hinged to the outside of the slider, an arc plate (4) is hinged to the outside of the connecting rod (3), and an electric telescopic rod (5) is fixedly installed on the inner wall of the molding equipment (1).

6. The forming apparatus for a flat tube according to claim 1, wherein: The molding equipment (1) has an installation ring (6) fixedly installed on its inner wall. The inner ring of the installation ring (6) is equipped with a flame nozzle (7). The installation ring (6) is located behind the arc plate (4).

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