A flat tube preparation tensioning device

Abstract

The utility model relates to a kind of flat pipe preparation tensioning device, be set between production device and unwinding wheel, including rack, the position of longitudinal beam is installed in the rack near upper end;First fixed pulley is installed on the longitudinal beam, second fixed pulley is installed in the rack between first fixed pulley and second fixed pulley near unwinding wheel side;Two mounting racks are arranged in the rack between first fixed pulley and second fixed pulley, and movable pulley is slidably installed between mounting rack, flat pipe raw material is sequentially wound around second fixed pulley, movable pulley and first fixed pulley from unwinding wheel, and then connected with production device.By the cooperation of first fixed pulley, movable pulley and second fixed pulley, the accurate monitoring of displacement sensor to movable pulley position, the tensioning state of flat pipe raw material is reflected by the position of movable pulley, signal can be real-time feedback to unwinding control system, realize the dynamic adjustment of unwinding speed, avoid the flat pipe relaxation wrinkle or excessive tensile deformation caused by traditional constant speed unwinding, ensure that flat pipe is always in optimum tension state.

Description

Technical Field

[0001] This utility model relates to the field of flat tube manufacturing technology, specifically a flat tube preparation tensioning device. Background Technology

[0002] As a key component of core equipment such as air conditioning and energy storage constant temperature systems in new energy vehicles, the production quality of flat tubes in heat exchangers directly affects heat exchange efficiency and system reliability. These flat tubes are mostly formed by hot extrusion of refined aluminum rods, featuring a thin-walled, porous structure. Continuous production and standardized storage are achieved through an unwinding device during the manufacturing process. Tension control during unwinding is particularly critical; insufficient tension can lead to loosening and wrinkling of the flat tubes, while excessive tension may cause plastic deformation or surface scratches. Therefore, the tensioning device becomes a core component of the unwinding equipment.

[0003] In the current field of heat exchanger flat tube production equipment technology, existing flat tube unwinding devices are mainly based on a constant speed control method. For example, some unwinding devices drive the unwinding wheel to rotate by setting a fixed motor speed, thereby achieving the unwinding of the flat tube. These technologies meet the unwinding needs in simple production scenarios to a certain extent. However, in actual use, there are many shortcomings. Existing unwinding devices have significant limitations in unwinding speed control and do not consider various variables that may occur during production. For example, in application scenarios where the operating speed of subsequent processing equipment (such as cutting and forming equipment) fluctuates, when the speed of the subsequent processing equipment is greater than the unwinding speed, the flat tube material will be overstretched, increasing tension and easily causing plastic deformation or even breakage of the flat tube material; while when the speed of the subsequent processing equipment is less than the unwinding speed, the flat tube material will accumulate after unwinding, leading to a decrease in tension and causing problems such as loosening and wrinkling of the flat tube material. This greatly limits the application of flat tubes in high-precision production scenarios. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model provides a flat tube preparation tensioning device.

[0005] The technical solution of this utility model is as follows: A flat tube preparation tensioning device is disposed between a production device and an unwinding reel, including a frame, wherein a longitudinal beam is installed near the upper end of the frame; A first fixed pulley is installed on the longitudinal beam, and a second fixed pulley is installed on one side of the frame near the unwinding wheel, with the two being spaced apart. Two mounting brackets are provided in the frame between the first fixed pulley and the second fixed pulley, and a movable pulley is slidably installed between the mounting brackets. The flat tube raw material self-unwinding reel passes around the second fixed pulley, the movable pulley, and the first fixed pulley in sequence before connecting to the production device.

[0006] To improve the quality of unwinding, the axes of the first fixed pulley, the second fixed pulley, and the movable pulley are parallel, and the axes of all three are parallel to the axis of the unwinding wheel.

[0007] To ensure the stability and smoothness of the flat tube during movement, the midpoints of the axes of the unwinding wheel, the first fixed pulley, the second fixed pulley, and the movable pulley are coplanar.

[0008] The sliding design of the movable pulley is such that the movable pulley is rotatably mounted between two supports, and a sliding groove block is provided on the side of the support near the mounting frame; The mounting bracket is provided with a guide rail for sliding the slide block on the side near the support.

[0009] To facilitate monitoring of the position of the movable pulley and subsequently adjust the unwinding speed to ensure unwinding quality, a displacement sensor is installed at the upper end of the mounting frame. Its signal transmitter faces the movable pulley and is electrically connected to the unwinding pulley's control system. This sensor can monitor the position of the movable pulley in real time and provide feedback to the control system, which then adjusts the unwinding speed based on the position information. This ensures that the flat tube maintains appropriate tension throughout the unwinding process, avoiding quality problems caused by excessive tension or looseness.

[0010] To improve the accuracy of monitoring, the signal transmitting end of the displacement sensor is aligned vertically with the axis of the movable pulley.

[0011] To improve the response speed of the displacement sensor, reflectors are installed on the upper ends of the two supports, and the reflectors are set horizontally, with their radial length along the movable pulley being less than the diameter of the movable pulley.

[0012] In order to ensure the accuracy of monitoring the position of the movable pulley and the normal operation of the monitoring system, another displacement sensor is installed at the lower end of the mounting bracket. Its signal transmitting end faces the movable pulley and is vertically aligned with the displacement sensor above.

[0013] To improve the stability of the first pulley, a crossbeam for mounting the longitudinal beam is installed on the rear side of the frame, and a connecting beam is installed below the crossbeam. The connecting beam is connected to the bottom of the longitudinal beam by an inclined reinforcing beam.

[0014] In order to ensure that the movable pulley can maintain a more stable posture during the movement and further ensure the tension and stability when the flat tube passes through, the axis of the movable pulley is coplanar with the bisector of the line connecting the centers of the first and second fixed pulleys.

[0015] The beneficial effects of this utility model are as follows: This utility model is a tensioning device for flat tube preparation. Through the coordinated operation of a first fixed pulley, a movable pulley, and a second fixed pulley, and the precise monitoring of the position of the movable pulley by a displacement sensor, the tension state of the flat tube material is reflected by the position of the movable pulley. The signal can be fed back to the unwinding control system in real time, realizing dynamic adjustment of the unwinding speed. This avoids the loosening, wrinkling, or excessive stretching deformation of the flat tube caused by traditional constant speed unwinding, ensuring that the flat tube material is always in the optimal tension state. The axes of the fixed pulley and the movable pulley are parallel and their midpoints are coplanar, ensuring the straightness of the flat tube in the unwinding path and reducing the additional stress caused by angular deviations. The bracket and the mounting frame, through the sliding cooperation of the sliding block and the guide rail, make the movement of the movable pulley smooth and without jamming, improving the sensitivity of the tension response. The symmetrically arranged displacement sensors and reflectors not only capture the position changes of the movable pulley in real time, but also improve the reliability of signal feedback through dual monitoring, providing data support for the precise speed adjustment of the control system. Attached Figure Description

[0016] The advantages and solutions of this application will become clear to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this invention.

[0017] In the attached diagram: Figure 1 This is a schematic diagram showing the relative positions of the tensioning devices; Figure 2 This is a front view of the tensioning device; Figure 3 Right view of the tensioning device; The components represented by the various reference numerals in the diagram are: 1. Production device; 2. Unwinding roller; 3. Frame; 4. Longitudinal beam; 5. First fixed pulley; 6. Second fixed pulley; 7. Mounting frame; 8. Moving pulley; 9. Flat tube; 10. Support; 11. Slide block; 12. Guide rail; 13. Displacement sensor; 14. Reflector; 15. Crossbeam; 16. Connecting beam; 17. Reinforcing beam. Detailed Implementation

[0018] Exemplary embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings.

[0019] Example As mentioned in the background art, in the existing flat tube production process, there are certain defects in the unwinding process of the flat tube raw material 9. The unwinding speed is usually set to a constant, but the flat tube raw material 9 often becomes loose or overstretched during the unwinding process, which leads to poor unwinding quality of the flat tube raw material 9. In extreme cases, it may even require stopping the machine for rectification. Therefore, the inventors have made improvements to the existing flat tube production process and designed a new type of flat tube preparation tensioning device, which will be explained in detail below with reference to the figures.

[0020] This embodiment discloses a tensioning device for flat tube preparation, aiming to solve problems such as loosening, wrinkling, or excessive stretching of the flat tube raw material 9 caused by fixed speed control in existing unwinding equipment. Through dynamic monitoring and adaptive adjustment mechanisms, it ensures stable tension of the flat tube raw material 9 during the unwinding process. Its specific structure and working method are as follows (see attached image). Figure 1 The entire device is installed on the frame 3 between the flat tube raw material 9 production device 1 and the unwinding wheel 2. This solution does not involve any modifications to the production device 1 or the unwinding wheel 2; existing technology is sufficient, and will not be elaborated further. The frame 3 is welded from structural steel, forming a stable frame structure capable of withstanding the tensile load during the unwinding process. Combined with... Figure 3 A longitudinal beam 4 is installed horizontally near the upper part of the frame 3, extending towards the front of the frame 3. A crossbeam 15 for fixing the longitudinal beam 4 is installed on the rear side of the frame 3. The crossbeam 15 is welded and fixed to the column of the frame 3. A connecting beam 16 is also installed below the crossbeam 15. One end of the connecting beam 16 is connected to the crossbeam 15, and the other end is connected to the bottom of the longitudinal beam 4. An inclined reinforcing beam 17 is also connected between the connecting beam 16 and the bottom of the longitudinal beam 4. The reinforcing beam 17, the connecting beam 16 and the longitudinal beam 4 form a triangular stable structure, which further enhances the load-bearing capacity of the longitudinal beam 4 and ensures the stability of the second fixed pulley 6 during operation.

[0021] In this embodiment, combined with Figure 2 A first fixed pulley 5 is installed on the longitudinal beam 4, and a second fixed pulley 6 is installed on one side of the frame 3 near the unwinding wheel 2. The two are spaced apart in the horizontal direction, and the wheels are rotatably connected to the frame 3 and the longitudinal beam 4 through bearing seats to ensure smooth rotation. Inside the frame 3 between the first fixed pulley 5 and the second fixed pulley 6, two parallel mounting frames 7 are vertically arranged. The mounting frames 7 are fixed to the bottom of the frame 3 by bolts. On the right side of each mounting frame 7, there is a guide rail 12 extending in the vertical direction. A movable pulley 8 is slidably installed between the two mounting frames 7. The wheel of the movable pulley 8 is rotatably installed between two supports 10. A sliding block 11 is provided on the side of the support 10 near the mounting frame 7. The sliding block 11 cooperates with the guide rail 12 on the mounting frame 7, so that the movable pulley 8 can slide up and down along the guide rail 12.

[0022] Based on the above structure, combined with Figure 1 and Figure 2 The trajectory of the flat tube material 9 during the unwinding process is carefully designed. The flat tube material 9 exiting the unwinding wheel 2 first passes over the upper end of the second fixed pulley 6, then downwards over the lower end of the movable pulley 8, and then upwards over the upper end of the first fixed pulley 5, finally entering the production device 1. This winding method creates a triangular tension fulcrum for the flat tube material 9 at the movable pulley 8. When the tension of the flat tube material 9 changes, the movable pulley 8 moves up and down accordingly: when the tension increases, the movable pulley 8 moves upwards; when the tension decreases, the movable pulley 8 moves downwards. Simultaneously, the axes of the first fixed pulley 5, the second fixed pulley 6, and the movable pulley 8 are parallel to each other and all parallel to the axis of the unwinding wheel 2, ensuring that the flat tube material 9 does not twist during the unwinding process. The midpoints of the axes of the unwinding roller 2, the first fixed pulley 5, the second fixed pulley 6, and the movable pulley 8 are in the same plane. The axis of the movable pulley 8 is also coplanar with the bisector of the line connecting the centers of the first fixed pulley 5 and the second fixed pulley 6. This structural design ensures that the flat tube material 9 is subjected to uniform force among the pulleys, avoiding damage to the flat tube material 9 caused by excessive local stress.

[0023] To monitor the position change of the movable pulley 8 in real time and thus reflect the tension state of the flat tube material 9, a displacement sensor 13 is installed at the upper end of the mounting bracket 7. Optionally, a DeepVision Intelligent SD-C series laser displacement sensor can be used, with its signal transmitting end facing the movable pulley 8 and aligned vertically with its axis. A horizontally positioned reflector 14 is installed at the upper end of the two supports 10. The radial length of the reflector 14 along the movable pulley 8 is less than the diameter of the movable pulley 8, reflecting the signal emitted by the displacement sensor 13 back, thereby achieving accurate measurement of the position of the movable pulley 8. The displacement sensor 13 is electrically connected to the control system of the unwinding wheel 2, feeding back the real-time monitored position information to the control system. The control system receives the displacement signal from the displacement sensor 13 and adjusts the unwinding speed of the unwinding wheel 2 using existing control methods. The control system determines the tension of the flat tube material 9 based on the position change of the movable pulley 8: when the position of the movable pulley 8 is higher than the set value, it indicates that the tension of the flat tube material 9 is too high and the unwinding speed is too slow, so the control system will increase the unwinding speed of the unwinding wheel 2; when the position of the movable pulley 8 is lower than the set value, it indicates that the tension of the flat tube material 9 is too low, so the control system will reduce the unwinding speed of the unwinding wheel 2. Through such dynamic adjustment, the flat tube material 9 is always kept in the optimal tension state.

[0024] To further improve the reliability of monitoring, another displacement sensor 13 is installed at the lower end of the mounting frame 7. Its signal transmitting end also faces the movable pulley 8 and is vertically aligned with the displacement sensor 13 above. The two displacement sensors 13 work simultaneously, enabling them to cross-verify monitoring data and avoid adjustment errors caused by the failure of a single sensor. Alternatively, if one displacement sensor 13 fails, the other displacement sensor 13 can continue to work, ensuring continuous monitoring of the position of the movable pulley 8, thereby guaranteeing the stability and reliability of the unwinding process.

[0025] When the tensioning device for preparing the flat tube material 9 is in operation, the flat tube material 9 is continuously unwound as the unwinding wheel 2 rotates. When the tension of the flat tube material 9 increases, the movable pulley 8 moves upward under its own weight and the tension of the flat tube material 9. The displacement sensor 13 detects this change and feeds the signal back to the control system. The control system then reduces the unwinding speed of the unwinding wheel 2 to restore the tension of the flat tube material 9 to the normal range. When the tension of the flat tube material 9 decreases, the movable pulley 8 moves downward, and the displacement sensor 13 feeds the signal back to the control system. The control system increases the unwinding speed of the unwinding wheel 2 to avoid the problems of loosening and wrinkling of the flat tube material 9.

Claims

1. A flat tube preparation tensioning device for unwinding flat tube raw material (9), disposed between the production device (1) and the unwinding wheel (2), characterized in that, Includes a frame (3), and a longitudinal beam (4) is installed in the frame (3) near the upper end; A first fixed pulley (5) is installed on the longitudinal beam (4), and a second fixed pulley (6) is installed on one side of the frame (3) near the unwinding wheel (2), and the two are spaced apart; Two mounting brackets (7) are provided in the frame (3) between the first fixed pulley (5) and the second fixed pulley (6), and a movable pulley (8) is slidably installed between the mounting brackets (7). The flat tube raw material (9) is connected to the production device (1) after the self-unwinding roller (2) passes around the second fixed pulley (6), the movable pulley (8), and the first fixed pulley (5) in sequence.

2. The flat tube preparation tensioning device according to claim 1, characterized in that, The axes of the first fixed pulley (5), the second fixed pulley (6), and the movable pulley (8) are parallel, and the axes of all three are parallel to the axis of the unwinding wheel (2).

3. The flat tube preparation tensioning device according to claim 2, characterized in that, The midpoints of the axes of the unwinding wheel (2), the first fixed pulley (5), the second fixed pulley (6), and the movable pulley (8) are coplanar.

4. The flat tube preparation tensioning device according to claim 1, characterized in that, The movable pulley (8) is rotatably installed between two supports (10), and a sliding block (11) is provided on the side of the support (10) close to the mounting frame (7). The mounting bracket (7) is provided with a guide rail (12) for sliding the slide block (11) on the side near the bracket (10).

5. The flat tube preparation tensioning device according to claim 4, characterized in that, The upper end of the mounting bracket (7) is equipped with a displacement sensor (13), whose signal transmitting end faces the movable pulley (8) and is electrically connected to the control system of the unwinding wheel (2). It can monitor the position of the movable pulley (8) in real time and feed it back to the control system. The control system adjusts the unwinding speed according to the position information.

6. The flat tube preparation tensioning device according to claim 5, characterized in that, The signal transmitting end of the displacement sensor (13) is aligned vertically with the axis of the movable pulley (8).

7. The flat tube preparation tensioning device according to claim 6, characterized in that, Reflectors (14) are installed on the upper ends of the two supports (10), and the reflectors (14) are set horizontally, with their radial length along the movable pulley (8) being less than the diameter of the movable pulley (8).

8. The flat tube preparation tensioning device according to claim 5, characterized in that, Another displacement sensor (13) is installed at the lower end of the mounting bracket (7), with its signal transmitting end facing the movable pulley (8) and aligned vertically with the displacement sensor (13) above.

9. The flat tube preparation tensioning device according to claim 1, characterized in that, The frame (3) is equipped with a crossbeam (15) for mounting the longitudinal beam (4) on the rear side, and a connecting beam (16) is installed below the crossbeam (15). The connecting beam (16) is connected to the bottom of the longitudinal beam (4) by an inclined reinforcing beam (17).

10. A flat tube preparation tensioning device according to claim 1, characterized in that, The axis of the movable pulley (8) is coplanar with the bisector of the line connecting the centers of the first fixed pulley (5) and the second fixed pulley (6).

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