A PET sheet thickness uniformity control device

Abstract

The utility model discloses a PET sheet thickness evenness control device, including thickness evenness control device, the thickness evenness control device is by upper end mounting bracket and bottom end mounting bracket constitutes, the upper end mounting bracket upside is installed with upper end extrusion mechanism, bottom end mounting bracket upside is installed with bottom end extrusion mechanism, the bottom end mounting bracket and upper end mounting bracket both ends between installation have range finding mechanism, bottom end mounting bracket and upper end mounting bracket between evenness have a plurality of distance adjusting mechanism, bottom end mounting bracket between the position below extrusion wheel between is provided with tension adjusting wheel. The utility model adopts gradual extrusion and not single extrusion, avoids the deformation, the wrinkle of sheet because of instantaneous excessive force, significantly promotes thickness evenness, and tension adjusting wheel and extrusion mechanism, bottom end extrusion mechanism) cooperation, can prevent sheet relaxation or overstretching, guarantees sheet form stable in processing process, reduces the rejection rate.

Description

Technical Field

[0001] This utility model relates to the field of sheet thickness control technology, specifically a device for controlling the uniform thickness of PET sheets. Background Technology

[0002] PET sheet thickness uniformity control refers to the technical management process in which the thickness deviation of PET (polyethylene terephthalate) sheets is controlled within a preset range through process optimization, equipment control, and real-time detection, ensuring that the thickness of the sheet remains consistent in the longitudinal (production direction), transverse (width direction), and local areas.

[0003] Chinese Patent No. 202322759508.7 discloses a film thickness adjustment device for a PET sheet extruder, relating to the field of PET sheet production technology. This utility model includes a base, with an adapter fixedly mounted on the top of the base. An inlet is fixedly provided on the top of the adapter, which is connected to an external feeder. A conveying cylinder is fixedly mounted on the left side wall of the adapter, and a first motor is fixedly mounted on the right side wall of the adapter.

[0004] In this invention, the thickness of the material cannot be controlled or adjusted during the forming process. Summary of the Invention

[0005] The purpose of this invention is to provide a PET sheet thickness uniformity control device to solve the problems raised in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a PET sheet thickness uniformity control device, comprising a thickness uniformity control device; the thickness uniformity control device consists of an upper mounting frame and a lower mounting frame, an upper extrusion mechanism is mounted on the upper side of the upper mounting frame, and a lower extrusion mechanism is mounted on the upper side of the lower mounting frame. The upper and lower extrusion mechanisms have the same structure and are composed of multiple extrusion rollers, the diameter of which increases sequentially, so that the distance between corresponding extrusion rollers of the upper and lower extrusion mechanisms gradually decreases. The upper extrusion mechanism extrudes from one side or the bottom. A transmission mechanism is installed on the other side of the mechanism. A power mechanism is installed on the other side of the upper extrusion mechanism or on one side of the lower extrusion mechanism. The power mechanism is installed on one side of the upper mounting frame or on the other side of the lower mounting frame. A distance measuring mechanism is installed between the two ends of the lower mounting frame and the upper mounting frame. Multiple distance adjustment mechanisms are evenly installed between the lower mounting frame and the upper mounting frame. A tension adjustment wheel is provided between the lower mounting frames and below the extrusion wheels. The tension adjustment wheel is rotatably mounted on the upper side of the tension adjustment mechanism. The tension adjustment mechanism is installed on both sides of the lower part of the lower mounting frame.

[0007] Preferably, the tension adjustment mechanism consists of a mounting groove, a guide rod, a slider, and a spring. The mounting groove is installed on both sides of the bottom mounting bracket, the guide rod is installed in the middle of the mounting groove, the slider is slidably installed on the upper side of the guide rod, and the spring is installed on the outer side of the guide rod at the upper end of the slider.

[0008] Preferably, the power mechanism consists of an electric motor and a transmission, with the electric motor mounted on the outside of the transmission and the transmission mounted on the inside of a bottom mounting bracket or an upper mounting bracket.

[0009] Preferably, the ranging mechanism consists of a ranging reflector and an infrared rangefinder. The ranging reflector is installed at both ends of one side of the upper mounting frame, and the infrared rangefinder is installed at both ends of one side of the lower mounting frame, corresponding to the position below the ranging reflector.

[0010] Preferably, the transmission mechanism consists of a synchronous belt and a synchronous pulley. The synchronous pulley is fixedly installed on the outer side of one end of the extrusion wheel of the upper extrusion mechanism or the lower extrusion mechanism. The synchronous belt is installed on the outer side of the synchronous pulley. Guide wheels are rotatably installed on the upper side of the upper or lower mounting bracket at positions on both sides or one side of the synchronous pulley. The guide wheels and the synchronous belt are slidably connected.

[0011] Preferably, the distance adjustment mechanism consists of a telescopic rod and a mounting plate. The mounting plate is installed on both sides of the upper mounting frame or the lower mounting frame, and the bottom and upper ends of the telescopic rod are both installed on the upper side of the corresponding mounting plate.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. By using progressive extrusion instead of single extrusion, the sheet material is prevented from deforming and wrinkling due to excessive instantaneous force, which significantly improves the uniformity of thickness. The tension adjustment wheel works in conjunction with the extrusion mechanism and the bottom extrusion mechanism to prevent the sheet material from loosening or being overstretched, ensuring the stability of the sheet material shape during processing and reducing the scrap rate. 2. After the power output from the power mechanism is transmitted to the first synchronous pulley, it drives all synchronous pulleys to rotate synchronously through the synchronous belt, thereby keeping each set of extrusion pulleys at the same speed. At the same time, the guide pulley slides in contact with the synchronous belt, which can limit the lateral displacement of the synchronous belt, prevent the synchronous belt from slipping or falling off during transmission, and ensure the stability of power transmission. 3. During operation, the infrared rangefinder emits an infrared signal towards the ranging reflector directly above. The signal is reflected by the ranging reflector and received by the infrared rangefinder. The infrared rangefinder calculates the real-time distance between the two ends of the upper and lower mounting brackets and the bottom mounting bracket by calculating the time difference between signal transmission and reception. Since the extrusion wheels are mounted on the upper and lower mounting brackets and the bottom mounting bracket, this distance indirectly reflects the overall gap between the extrusion wheels. If the infrared rangefinder detects that the distance between the two ends is inconsistent, it can trigger the distance adjustment mechanism to correct it and ensure that the gap between the extrusion wheels is uniform. 4. When it is necessary to adjust the gap between the extrusion wheels, the vertical distance between the upper and lower mounting brackets can be directly changed by controlling the extension and retraction of the telescopic rod. When the telescopic rod extends, the distance between the mounting brackets and the lower mounting brackets increases, and the gap between the extrusion wheels expands accordingly. When the telescopic rod shortens, the distance between the mounting brackets and the lower mounting brackets decreases, and the gap between the extrusion wheels shrinks synchronously. Combined with the real-time detection data of the distance measuring mechanism, precise fine-tuning of the gap between the extrusion wheels can be achieved. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the bottom mounting bracket of this utility model; Figure 3 This is a schematic diagram of the upper mounting bracket of this utility model; Figure 4 This is a side view of the structure of this utility model; Figure 5 This is a schematic diagram of the tension adjustment mechanism of this utility model.

[0014] In the diagram: 1. Thickness uniformity control device; 2. Upper mounting bracket; 3. Bottom mounting bracket; 4. Transmission mechanism; 5. Distance measuring reflector; 6. Infrared rangefinder; 7. Distance measuring mechanism; 8. Mounting plate; 9. Telescopic rod; 10. Distance adjustment mechanism; 11. Tension adjustment mechanism; 12. Upper extrusion mechanism; 13. Extrusion wheel; 14. Guide wheel; 15. Synchronous pulley; 16. Synchronous belt; 17. Bottom extrusion mechanism; 18. Gearbox; 19. Electric motor; 20. Power mechanism; 21. Tension adjusting wheel; 22. Spring; 23. Guide rod; 24. Slider; 25. Mounting groove. 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 , Figure 2 , Figure 3 , Figure 4 In this embodiment of the present invention, a PET sheet thickness uniformity control device includes a thickness uniformity control device 1. The thickness uniformity control device 1 consists of an upper mounting frame 2 and a lower mounting frame 3. An upper extrusion mechanism 12 is mounted on the upper side of the upper mounting frame 2, and a lower extrusion mechanism 17 is mounted on the upper side of the lower mounting frame 3. The upper extrusion mechanism 12 and the lower extrusion mechanism 17 have the same structure and are composed of multiple extrusion rollers 13. The diameter of the extrusion rollers 13 increases sequentially, so that the distance between the corresponding extrusion rollers 13 of the upper extrusion mechanism 12 and the lower extrusion mechanism 17 gradually decreases. The upper extrusion mechanism 12 or the lower extrusion mechanism 17 can be used to control the thickness uniformity of PET sheets. A transmission mechanism 4 is installed on the other side of 17. A power mechanism 20 is installed on the other side of the upper extrusion mechanism 12 or on the side of the bottom extrusion mechanism 17. The power mechanism 20 is installed on one side of the upper mounting frame 2 or on the other side of the bottom mounting frame 3. A distance measuring mechanism 7 is installed between the two ends of the bottom mounting frame 3 and the upper mounting frame 2. Multiple distance adjustment mechanisms 10 are evenly installed between the bottom mounting frame 3 and the upper mounting frame 2. A tension adjustment wheel 21 is set between the bottom mounting frames 3 and below the extrusion wheels 13. The tension adjustment wheel 21 is rotatably installed on the upper side of the tension adjustment mechanism 11. The tension adjustment mechanism 11 is installed on both sides of the lower part of the bottom mounting frame 3.

[0017] The tension adjustment mechanism 11 consists of a mounting groove 25, a guide rod 23, a slider 24, and a spring 22. The mounting groove 25 is installed on both sides of the bottom mounting bracket 3, the guide rod 23 is installed in the middle of the mounting groove 25, the slider 24 is slidably installed on the upper side of the guide rod 23, and the spring 22 is installed on the outer side of the guide rod 23 at the upper end of the slider 24. When the tension of the PET sheet increases, the tension of the sheet on the tension adjustment wheel 21 increases, pushing the slider 24 to slide upward along the guide rod 23 and compressing the spring 22 on the outer side of the guide rod 23. The spring 22 generates a reverse elastic force under compression, which offsets part of the tension. When the tension of the sheet decreases, the spring 22 elastically returns to its original position, causing the slider 24 to slide downward and the tension adjustment wheel 21 to move downward, maintaining the basic tension of the sheet. Through the dynamic balance of "sliding slider 24 + buffering spring 22", the adaptive adjustment of the sheet tension is achieved.

[0018] The power mechanism 20 consists of an electric motor 19 and a gearbox 18. The electric motor 19 is mounted on the outside of the gearbox 18, and the gearbox 18 is mounted on the inside of the bottom mounting bracket 3 or the top mounting bracket 2. In the power mechanism 20, the electric motor 19 serves as the power source and outputs torque. The gearbox 18 is linked to the electric motor 19 and fixed on the bottom mounting bracket 3 or the top mounting bracket 2. According to the target thickness and material characteristics of the PET sheet, the output speed can be adjusted by the gearbox 18. When processing thicker sheets, the gearbox 18 reduces the speed, so that the extrusion roller 13 extrudes at a slower speed to ensure sufficient shaping. When processing thinner sheets, the gearbox 18 increases the speed to improve processing efficiency.

[0019] The ranging mechanism 7 consists of a ranging reflector 5 and an infrared rangefinder 6. The ranging reflector 5 is installed at both ends of one side of the upper mounting frame 2, and the infrared rangefinder 6 is installed at both ends of one side of the lower mounting frame 3, corresponding to the position below the ranging reflector 5. During operation, the infrared rangefinder 6 emits an infrared signal towards the ranging reflector 5 directly above it. The signal is reflected by the ranging reflector 5 and received by the infrared rangefinder 6. The infrared rangefinder 6 calculates the time difference between signal transmission and reception to obtain the real-time distance between the two ends of the upper and lower mounting frames, i.e., the upper mounting frame 2 and the lower mounting frame 3. Since the extrusion wheels 13 are installed on the upper and lower mounting frames, i.e., the upper mounting frame 2 and the lower mounting frame 3, this distance indirectly reflects the overall gap between the extrusion wheels 13. If the infrared rangefinder 6 detects that the distance between the two ends is inconsistent or deviates from the preset value, it can trigger the distance adjustment mechanism 10 to correct it, ensuring that the gap between the extrusion wheels 13 is uniform.

[0020] The transmission mechanism 4 consists of a synchronous belt 16 and synchronous pulleys 15. The synchronous pulleys 15 are fixedly installed on the outer side of one end of the extrusion wheel 13 of the upper extrusion mechanism 12 or the lower extrusion mechanism 17. The synchronous belt 16 is installed on the outer side of the synchronous pulleys 15. Guide wheels 14 are rotatably installed on the upper side of the upper mounting bracket 2 or the lower mounting bracket 3 at positions on both sides or one side of the synchronous pulleys 15. The guide wheels 14 and the synchronous belt 16 are slidably connected. After the power output from the power mechanism 20 is transmitted to the first synchronous pulley 15, it drives all the synchronous pulleys 15 to rotate synchronously through the synchronous belt 16, thereby keeping the extrusion wheels 13 of each group at the same speed. At the same time, the guide wheels 14 slide in contact with the synchronous belt 16, which can limit the lateral displacement of the synchronous belt 16, prevent the synchronous belt 16 from slipping or falling off during the transmission process, and ensure the stability of power transmission.

[0021] The distance adjustment mechanism 10 consists of a telescopic rod 9 and a mounting plate 8. The mounting plate 8 is installed on both sides of the upper mounting frame 2 or the lower mounting frame 3. The bottom and top ends of the telescopic rod 9 are installed on the corresponding mounting plates 8. When it is necessary to adjust the gap of the extrusion rollers 13, such as when processing PET sheets of different thicknesses, the vertical distance between the upper mounting frame 2 and the lower mounting frame 3 can be directly changed by controlling the extension and retraction of the telescopic rod 9. When the telescopic rod 9 extends, the distance between the mounting frames, i.e., the upper mounting frame 2 and the lower mounting frame 3, increases, and the gap of the extrusion rollers 13 expands accordingly. When the telescopic rod 9 shortens, the distance between the mounting frames, i.e., the upper mounting frame 2 and the lower mounting frame 3, decreases, and the gap of the extrusion rollers 13 shrinks synchronously. Combined with the real-time detection data of the distance measuring mechanism 7, precise fine-tuning of the gap of the extrusion rollers 13 can be achieved.

[0022] The working principle and usage process of this utility model are as follows: During PET sheet processing, the sheet enters the gap between the upper extrusion mechanism 12 and the lower extrusion mechanism 17 along a preset path. Since the diameters of the extrusion rollers 13 of the two extrusion mechanisms (upper extrusion mechanism 12 and lower extrusion mechanism 17) increase sequentially along the sheet's travel direction, the relative distance between the corresponding extrusion rollers 13 gradually decreases. When the sheet passes through the first set of extrusion rollers 13 with a larger distance, it undergoes initial shaping. Then, through subsequent progressively smaller distances, it achieves gradual extrusion, ultimately achieving a uniform thickness. Simultaneously, the power mechanism 20 provides driving force, which drives all extrusion rollers 13 to rotate synchronously through the transmission mechanism 4, ensuring stable sheet travel speed. The tension adjustment wheel on the lower mounting bracket 3... 21 pushes the upper surface of the sheet to balance the tension of the sheet during the extrusion process; the distance measuring mechanism 7 monitors the distance between the upper and lower mounting frames, i.e., the upper mounting frame 2 and the lower mounting frame 3, in real time. If a deviation is found, the distance adjustment mechanism 10 can be used to finely adjust the distance between the upper mounting frame 2 and the lower mounting frame 3, thereby indirectly correcting the gap of the extrusion wheel 13, ensuring the thickness control accuracy. Gradual extrusion is adopted instead of single extrusion to avoid deformation and wrinkling of the sheet due to excessive instantaneous force, which significantly improves the thickness uniformity. The tension adjusting wheel 21 works in conjunction with the upper extrusion mechanism 12 and the lower extrusion mechanism 17 to prevent the sheet from loosening or being overstretched, ensuring the stability of the sheet shape during processing and reducing the scrap rate.

[0023] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A PET sheet thickness uniformity control device, comprising a thickness uniformity control device (1); characterized in that: The thickness uniformity control device (1) consists of an upper mounting frame (2) and a lower mounting frame (3). An upper extrusion mechanism (12) is mounted on the upper side of the upper mounting frame (2), and a lower extrusion mechanism (17) is mounted on the upper side of the lower mounting frame (3). The upper extrusion mechanism (12) and the lower extrusion mechanism (17) have the same structure. The upper extrusion mechanism (12) and the lower extrusion mechanism (17) are composed of multiple extrusion wheels (13). The diameter of the extrusion wheels (13) increases sequentially, so that the distance between the corresponding extrusion wheels (13) of the upper extrusion mechanism (12) and the lower extrusion mechanism (17) gradually decreases. A transmission mechanism is mounted on one side of the upper extrusion mechanism (12) or the other side of the lower extrusion mechanism (17). 4) A power mechanism (20) is installed on the other side of the upper extrusion mechanism (12) or on the side of the bottom extrusion mechanism (17). The power mechanism (20) is installed on one side of the upper mounting frame (2) or on the other side of the bottom mounting frame (3). A distance measuring mechanism (7) is installed between the two ends of the bottom mounting frame (3) and the upper mounting frame (2). Multiple distance adjustment mechanisms (10) are evenly installed between the bottom mounting frame (3) and the upper mounting frame (2). A tension adjustment wheel (21) is provided between the bottom mounting frames (3) and below the extrusion wheels (13). The tension adjustment wheel (21) is rotatably installed on the upper side of the tension adjustment mechanism (11). The tension adjustment mechanism (11) is installed on both sides of the lower part of the bottom mounting frame (3).

2. The PET sheet thickness uniformity control device according to claim 1, characterized in that: The tension adjustment mechanism (11) consists of a mounting groove (25), a guide rod (23), a slider (24), and a spring (22). The mounting groove (25) is installed on both sides of the bottom mounting bracket (3). The guide rod (23) is installed in the middle of the mounting groove (25). The slider (24) is slidably installed on the upper side of the guide rod (23). The spring (22) is installed on the outside of the guide rod (23) at the upper end of the slider (24).

3. The PET sheet thickness uniformity control device according to claim 1, characterized in that: The power mechanism (20) consists of an electric motor (19) and a transmission (18). The electric motor (19) is mounted on the outside of the transmission (18), and the inside of the transmission (18) is mounted on one side of the bottom mounting bracket (3) or the upper mounting bracket (2).

4. The PET sheet thickness uniformity control device according to claim 1, characterized in that: The ranging mechanism (7) consists of a ranging reflector (5) and an infrared rangefinder (6). The ranging reflector (5) is installed on both ends of one side of the upper mounting bracket (2), and the infrared rangefinder (6) is installed on both ends of one side of the lower mounting bracket (3) at the position below the ranging reflector (5).

5. The PET sheet thickness uniformity control device according to claim 1, characterized in that: The transmission mechanism (4) consists of a synchronous belt (16) and a synchronous pulley (15). The synchronous pulley (15) is fixedly installed on the outside of one end of the extrusion wheel (13) of the upper extrusion mechanism (12) or the lower extrusion mechanism (17). The synchronous belt (16) is installed on the outside of the synchronous pulley (15). The upper mounting bracket (2) or the lower mounting bracket (3) is rotatably installed with guide wheels (14) on both sides or one side of the synchronous pulley (15). The guide wheels (14) and the synchronous belt (16) are slidably connected.

6. The PET sheet thickness uniformity control device according to claim 1, characterized in that: The distance adjustment mechanism (10) consists of a telescopic rod (9) and a mounting plate (8). The mounting plate (8) is installed on both sides of the upper mounting frame (2) or the lower mounting frame (3). The bottom and upper ends of the telescopic rod (9) are both installed on the upper side of the corresponding mounting plate (8).

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