PTFE film stretching and sintering device

Abstract

The invention discloses a PTFE (polytetrafluoroethylene) film stretching and sintering device, which belongs to the technical field of film stretching equipment and comprises a fixing plate, a stretching and sintering chamber, a plurality of cross rods, a plurality of stretching rollers, a heater, a driving mechanism, an unwinding mechanism and a winding mechanism. According to the PTFE film stretching and sintering device, by arranging the cleaning mechanism, the surface of the stretching roller can be cleaned, impurities attached to the stretching roller are effectively removed, the cleanliness of the stretching roller is kept, the stretching effect is improved, and the service life of the device is prolonged. According to the driving mechanism, the chain, the chain wheel and the driving motor are arranged, the driving motor drives the multiple transverse rods and the stretching rollers to rotate at the same time, the stability and synchronism of the stretching process are ensured, and the film quality problem caused by uneven stretching is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of film stretching equipment, and in particular relates to a PTFE film stretching and sintering device. Background Art

[0002] Polytetrafluoroethylene (PTFE) is a polymer material made of tetrafluoroethylene. It has excellent chemical stability, corrosion resistance, sealing, high lubricity, non-stickiness, electrical insulation and good anti-aging resistance, and is physiologically inert and non-toxic. In the production process of PTFE (polytetrafluoroethylene) film, stretching and sintering are crucial links. The stretching process can give the film specific physical properties, such as strength and ductility, while the sintering process further consolidates these properties to ensure the stability and durability of the film.

[0003] However, the traditional PTFE film stretching and sintering equipment has shortcomings in cleaning. After long-term use, debris and residues are easily attached to the surface of the stretching roller. The debris and residues will seriously affect the stretching effect and film quality. However, the traditional device lacks a mechanism for cleaning the stretching roller, which causes users to spend a lot of time and energy on manual cleaning, reducing the production efficiency and quality of the PTFE film. Summary of the invention

[0004] The purpose of the present invention is to provide a PTFE film stretching and sintering device, which is used to solve the technical problem in the prior art that after long-term use, the surface of the stretching roller is easily attached with debris and residues, which will seriously affect the stretching effect and film quality. However, the traditional device lacks a mechanism for cleaning the stretching roller, which causes users to spend a lot of time and energy on manual cleaning, thereby reducing the production efficiency and quality of the PTFE film.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A PTFE film stretching and sintering device comprises: a fixed plate; a stretching and sintering chamber, installed on the top surface of the fixed plate; a plurality of cross bars, all rotatably connected to the stretching and sintering chamber; a plurality of stretching rollers, respectively fixedly sleeved on the plurality of cross bars, for performing constant force stretching treatment on the film; a heater, installed on the inner bottom surface of the stretching and sintering chamber; a driving mechanism, for driving the plurality of cross bars to rotate simultaneously; a cleaning mechanism, for cleaning the plurality of stretching rollers; a reeling mechanism, installed on the top surface of the fixed plate, for conveying the film into the stretching and sintering chamber; and a reeling mechanism, installed on the top surface of the fixed plate, for reeling the film after being stretched, sintered and finalized.

[0007] Preferably, the driving mechanism includes: a plurality of sprockets, respectively mounted on the portions of the plurality of cross bars located outside the stretching and sintering chamber; a plurality of chains, mounted on the plurality of sprockets; a protective box, installed on one side of the stretching and sintering chamber, the sprockets and chains are both located in the protective box; a driving motor, installed on the protective box, and its power output shaft is fixedly connected to the cross bar.

[0008] Preferably, the cleaning mechanism includes: a multi-stage electric push rod, which is installed through the side of the stretching and sintering chamber; a vertical plate, which is located in the stretching and sintering chamber and is fixedly connected to the extended end of the multi-stage electric push rod; and a plurality of annular scrapers, which are all installed on the vertical plate and are used to clean the surfaces of the plurality of stretching rollers.

[0009] Preferably, the unwinding mechanism includes: a first fixed frame, mounted on the top surface of the fixed plate; a first motor, mounted on the first fixed frame; two first rotating shafts, both rotatably connected to the first fixed frame, and any one of the first rotating shafts is fixedly connected to the power output shaft of the first motor; two first support plates, respectively fixedly connected to the two first rotating shafts; a first rotating rod, placed on the two first support plates; an unwinding roller, fixedly mounted on the first rotating rod; two first baffles, rotatably mounted on the unwinding roller; two first pressure plates, respectively placed on the two first support plates; and two first bolts, which are used to connect the first support plate and the first pressure plate.

[0010] Preferably, the PTFE film stretching and sintering device also includes: two pairs of support frames, both installed on the bottom surface of the fixed plate; four grooves, respectively opened on the four support frames, the grooves matching the first rotating rod; two support blocks, both installed on the bottom surface of the fixed plate.

[0011] Preferably, the PTFE film stretching and sintering device also includes a control system, which includes: a data acquisition module, which is used to collect comprehensive data information of the stretching and sintering device, wherein the comprehensive data information includes temperature difference data of the stretching roller, thermal sensitivity data of the film, thickness data of the film and humidity data in the stretching and sintering chamber; a data analysis module, which generates a temperature demand coefficient based on the comprehensive data information, and generates a corresponding heating power level based on the temperature demand coefficient; a data acquisition module, which is used to collect a historical training data set of the stretching and sintering device, and the historical training data set includes stretching comprehensive influence data and stretching speed; a speed prediction module, which trains a machine learning model for predicting the stretching speed based on the historical training data set, collects real-time stretching comprehensive influence data, and inputs it into the trained machine learning model to predict the stretching speed.

[0012] Preferably, the temperature requirement coefficient is obtained by weighted calculation of the temperature difference data of the stretching roller, the thermal sensitivity data of the film, the thickness data of the film and the humidity data in the stretching sintering chamber.

[0013] Preferably, the heating power level is generated as follows: the heating power level includes level 1 heating power, level 2 heating power and level 3 heating power, wherein the level 1 heating power, level 2 heating power and level 3 heating power increase in sequence; the threshold range of the preset temperature demand coefficient is Wd 1 、Wd 2 , Wd 1 <Wd 2 ; If Wd≤Wd 1 At this time, the data analysis module generates the first-level heating power; if Wd 2 ≥Wd>Wd 1 At this time, the data analysis module generates the secondary heating power; if Wd>Wd 2 ,At this time, the data analysis module generates the third level of heating power.

[0014] Preferably, the training method of the machine learning model for predicting the stretching speed includes: converting the collected stretching comprehensive impact data into a corresponding set of feature vectors; using each set of feature vectors as the input of the machine learning model, the machine learning model uses the stretching speed corresponding to each set of stretching comprehensive impact data as the output, uses the stretching speed actually corresponding to each set of stretching comprehensive impact data as the prediction target, and uses minimizing the loss function value of the machine learning model as the training target; and stops training when the loss function value of the machine learning model is less than or equal to the preset target loss value.

[0015] Preferably, the machine learning model is one of the models such as SVM regression, random forest regression or neural network regression.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0017] 1. The PTFE film stretching and sintering device of the present invention can clean the surface of the stretching roller by setting a cleaning mechanism, effectively remove the debris attached to the stretching roller, maintain the cleanliness of the stretching roller, and improve the stretching effect and the service life of the equipment.

[0018] 2. The driving mechanism of the present invention is provided with a chain, a sprocket and a driving motor, and the driving motor drives multiple cross bars and stretching rollers to rotate simultaneously, thereby ensuring the stability and synchronization of the stretching process and avoiding film quality problems caused by uneven stretching.

[0019] 3. The PTFE film stretching and sintering device of the present invention is equipped with a support frame, a groove, a first rotating rod, a second rotating rod, a first baffle and a second baffle. When the stretching operation is not performed, the first rotating rod and the second rotating rod can be placed in the groove, and the first baffle and the second baffle can be used as temporary moving wheels to facilitate the movement of the entire device, thereby improving the flexibility and portability of the device.

[0020] 4. The control system in the present invention can predict and control the rotation speed of the stretching roller based on real-time data by setting up a data acquisition module, a data analysis module, a data acquisition module and a speed prediction module, thereby achieving precise control of the film stretching speed, which is beneficial to improving the uniformity and consistency of film stretching; the control system can also reduce the unevenness and waste in the stretching process, improve production efficiency, reduce the scrap rate caused by uneven stretching or temperature fluctuations, and also help to reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a three-dimensional diagram of the PTFE film stretching and sintering device of the present invention;

[0023] Figure 2 It is a schematic diagram of the PTFE film stretching and sintering device without a protective box in the present invention;

[0024] Figure 3 It is a schematic diagram of the interior of the stretching sintering chamber in the present invention;

[0025] Figure 4 It is a schematic diagram of the assembly structure of the stretching sintering chamber, the stretching roller and the cleaning mechanism in the present invention;

[0026] Figure 5 is a three-dimensional diagram of the cleaning mechanism of the present invention;

[0027] Figure 6 It is a schematic diagram of the assembly structure of the driving mechanism and the stretching roller in the present invention;

[0028] Figure 7 It is an exploded view of the unwinding mechanism in the present invention;

[0029] Figure 8 It is an exploded view of the winding mechanism in the present invention;

[0030] Fig. 9The three-dimensional PTFE film stretching and sintering device in another state of the present invention is shown in FIG. Figure 1 ;

[0031] Fig.10 The three-dimensional PTFE film stretching and sintering device in another state of the present invention is shown in FIG. Figure 2 ;

[0032] Fig.11 It is a module diagram of the control system in the present invention;

[0033] Reference numerals: 100, fixed plate; 101, support frame; 102, groove; 103, support block; 200, unwinding mechanism; 201, first fixed frame; 202, first motor; 203, first rotating shaft; 204, first supporting plate; 205, first rotating rod; 206, unwinding roller; 207, first baffle; 208, first pressing plate; 209, first bolt; 301, stretching sintering chamber; 302, cross bar; 303, stretching roller; 304, protective box; 305, sprocket; 306, chain; 307, drive motor; 308, heater; 310, cleaning mechanism; 311, multi-stage electric push rod; 312, vertical plate; 313, annular scraper; 400, winding mechanism; 401, second fixed frame; 402, second motor; 403, second rotating shaft; 404, second support plate; 405, second rotating rod; 406, winding roller; 407, second baffle; 408, second pressure plate; 409, second bolt. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example 1: Figure 1-Figure 4 As shown, a PTFE film stretching and sintering device includes a fixed plate 100, a stretching and sintering chamber 301, a plurality of cross bars 302, a plurality of stretching rollers 303, a heater 308, a driving mechanism, a unwinding mechanism 200 and a winding mechanism 400.

[0036] The stretching and sintering chamber 301 is installed on the top surface of the fixed plate 100; multiple cross bars 302 are rotatably connected to the stretching and sintering chamber 301; multiple stretching rollers 303 are respectively fixedly mounted on the multiple cross bars 302, and the stretching rollers 303 are used to perform constant force stretching treatment on the film; the heater 308 is installed on the inner bottom surface of the stretching and sintering chamber 301, and the power of the heater 308 can be adjusted, and the higher the power, the better the heating effect; the driving mechanism is used to drive the multiple cross bars 302 to rotate at the same time; the unwinding mechanism 200 is installed on the top surface of the fixed plate 100, and the unwinding mechanism 200 is used to transport the film into the stretching and sintering chamber 301; the winding mechanism 400 is installed on the top surface of the fixed plate 100, and the winding mechanism 400 is used to wind up the film after stretching and sintering.

[0037] Specifically, the film is passed through the stretching and sintering chamber 301 through the unwinding mechanism 200 and is wound around the stretching roller 303 in sequence, and then the film is passed out of the stretching and sintering chamber 301 and connected to the winding mechanism 400; when in use, the temperature in the stretching and sintering chamber 301 is increased to the required temperature by starting the heater 308, and then the driving mechanism is started to drive the multiple cross bars 302 and the stretching rollers 303 to rotate, so that the multiple stretching rollers 303 stretch the film, and the stretched film will be moved out to the stretching and sintering chamber 301, and the film after stretching and sintering will be wound up by the winding mechanism 400.

[0038] like Figure 2 , Figure 5 and Figure 6 As shown, the driving mechanism includes a plurality of sprockets 305, a plurality of chains 306, a protection box 304 and a driving motor 307. The plurality of sprockets 305 are respectively sleeved on the portions of the plurality of cross bars 302 located outside the stretching sintering chamber 301; the chain 306 is sleeved on two sprockets 305, and the plurality of chains 306 sequentially connect the plurality of sprockets 305 together; the protection box 304 is installed on one side of the stretching sintering chamber 301, and the sprockets 305 and the chains 306 are both located in the protection box 304; the driving motor 307 is installed on the protection box 304, and the power output shaft of the driving motor 307 is fixedly connected to the cross bar 302.

[0039] Specifically, when the driving motor 307 is running, it will drive one crossbar 302 to rotate, and then drive the remaining crossbars 302 to rotate through the sprocket 305 and the chain 306. When multiple crossbars 302 rotate, multiple stretching rollers 303 will rotate simultaneously. By providing a protective box 304, it is possible to prevent the chain 306 and the sprocket 305 from injuring people, and to prevent dust and debris from affecting the connection between the chain 306 and the sprocket 305.

[0040] like Figure 4 and Figure 5As shown, the PTFE film stretching and sintering device also includes a cleaning mechanism 310, which includes a multi-stage electric push rod 311, a vertical plate 312 and a plurality of annular scrapers 313. The multi-stage electric push rod 311 is installed through the side of the stretching and sintering chamber 301; the vertical plate 312 is located in the stretching and sintering chamber 301, and the vertical plate 312 is fixedly connected to the extended end of the multi-stage electric push rod 311; the plurality of annular scrapers 313 are all installed on the vertical plate 312, and the plurality of annular scrapers 313 are used to clean the surfaces of the plurality of stretching rollers 303.

[0041] Specifically, when the stretching operation is not performed, the multi-stage electric push rod 311 is started to drive the vertical plate 312 to move, thereby driving the multiple annular scrapers 313 to move. The annular scrapers 313 will move along the stretching roller 303, thereby scraping off the debris attached to the surface of the stretching roller 303.

[0042] like Figure 1 and Figure 7 As shown, the unwinding mechanism 200 includes a first fixed frame 201, a first motor 202, two first rotating shafts 203, two first supporting plates 204, a first rotating rod 205, an unwinding roller 206, two first baffles 207, two first pressure plates 208 and two first bolts 209.

[0043] The first fixed frame 201 is installed on the top surface of the fixed plate 100; the first motor 202 is installed on the first fixed frame 201; the two first rotating shafts 203 are both rotatably connected to the first fixed frame 201, and any first rotating shaft 203 is fixedly connected to the power output shaft of the first motor 202; the two first supporting plates 204 are respectively fixedly connected to the two first rotating shafts 203, and the first supporting plates 204 are arc-shaped plates; the first rotating rod 205 is placed on the two first supporting plates 204; the unwinding roller 206 is fixedly sleeved on the first rotating rod 205; the two first baffles 207 are rotatably sleeved on the unwinding roller 206; the two first pressing plates 208 are respectively placed on the two first supporting plates 204, and the first pressing plates 208 are arc-shaped plates; the first bolt 209 is used to connect the first supporting plate 204 and the first pressing plate 208.

[0044] Specifically, when the first motor 202 is started, the power output shaft of the first motor 202 drives a first rotating shaft 203 to rotate, and then drives the first supporting plate 204 to rotate, and then drives the first rotating rod 205, the unwinding roller 206 and another first rotating shaft 203 to rotate.

[0045] When the unwinding roller 206 needs to be removed from the first fixing frame 201 , the first bolt 209 is separated from the first support plate 204 by using a tool, thereby facilitating the separation of the first baffle plate 207 from the first support plate 204 , and then the first rotating rod 205 and the unwinding roller 206 are removed from the two first support plates 204 .

[0046] like Figure 1 and Figure 8 As shown, the winding mechanism 400 includes a second fixing frame 401 , a second motor 402 , two second rotating shafts 403 , two second supporting plates 404 , a second rotating rod 405 , a winding roller 406 , two second baffles 407 , two second pressure plates 408 and two second bolts 409 .

[0047] The second fixed frame 401 is installed on the top surface of the fixed plate 100; the second motor 402 is installed on the second fixed frame 401; the two second rotating shafts 403 are both rotatably connected to the second fixed frame 401, and any second rotating shaft 403 is fixedly connected to the power output shaft of the second motor 402; the two second support plates 404 are respectively fixedly connected to the two second rotating shafts 403; the second rotating rod 405 is placed on the two second support plates 404; the winding roller 406 is fixedly mounted on the second rotating rod 405; the two second baffles 407 are rotatably mounted on the unwinding roller 206; the two second pressure plates 408 are respectively placed on the two second support plates 404; the second bolt 409 is used to connect the second support plate 404 and the second pressure plate 408.

[0048] Specifically, when the second motor 402 is started, the power output shaft of the second motor 402 drives a second rotating shaft 403 to rotate, and then drives the second supporting plate 404 to rotate, and then drives the second rotating rod 405, the winding roller 406 and another second rotating shaft 403 to rotate.

[0049] like Figure 1 , Figure 2 , Fig. 9 and Fig.10 As shown, the PTFE film stretching and sintering device also includes two pairs of support frames 101, four grooves 102 and two support blocks 103. The two pairs of support frames 101 are installed on the bottom surface of the fixed plate 100; the four grooves 102 are respectively opened on the four support frames 101, and the grooves 102 match the first rotating rod 205 and the second rotating rod 405; the two support blocks 103 are installed on the bottom surface of the fixed plate 100.

[0050] Working principle: Before use, the film to be stretched and sintered is mounted on the unwinding roller 206; when in use, the film is passed through the unwinding roller 206 into the stretching and sintering chamber 301, and is wound around the stretching roller 303 in sequence, and then the film is passed out of the stretching and sintering chamber 301 and connected to the winding roller 406 (such as Figure 3 shown).

[0051] Then, by starting the heater 308, the temperature in the stretching and sintering chamber 301 is increased to the required temperature, and then by starting the driving motor 307, the power output shaft of the driving motor 307 drives a cross bar 302 to rotate, and then drives the remaining cross bars 302 to rotate through the sprocket 305 and the chain 306. When multiple cross bars 302 rotate, they will drive multiple stretching rollers 303 to rotate at the same time, so that multiple stretching rollers 303 stretch the film, and the stretched film will be moved out to the stretching and sintering chamber 301. By starting the second motor 402, the power output shaft of the second motor 402 drives a second rotating shaft 403 to rotate, and then drives the second support plate 404 to rotate, and then drives the second rotating rod 405, the winding roller 406 and another second rotating shaft 403 to rotate, and then the film after stretching, sintering and shaping is wound.

[0052] When the stretching operation is not performed, the multi-stage electric push rod 311 is started to drive the vertical plate 312 to move, thereby driving the multiple annular scrapers 313 to move. The annular scrapers 313 will move along the stretching roller 303 to scrape away the debris attached to the surface of the stretching roller 303.

[0053] When the stretching operation is not performed and the device needs to be moved, the second pressing plate 408 is separated from the second supporting plate 404 by rotating the second bolt 409, and the second rotating rod 405 and the winding roller 406 are removed from the two second supporting plates 404; then the first bolt 209 is rotated to separate the first pressing plate 208 from the first supporting plate 204, and then the first rotating rod 205 and the unwinding roller 206 are removed from the two first supporting plates 204;

[0054] Then, lift the fixed plate 100, place the first rotating rod 205 in the two grooves 102, and place the second rotating rod 405 in the two grooves 102, so that the support frame 101 and the support block 103 are not in contact with the ground, and the two first baffles 207 and the two second baffles 407 are in contact with the ground. Since the first baffle 207 rotates with the first rotating rod 205, the second baffle 407 is rotatably connected with the second rotating rod 405, which also allows the first baffle 207 and the second baffle 407 to act as temporary moving wheels, thereby making the device easy to be pushed and improving the flexibility of the device.

[0055] Example 2: Figure 1-Figure 4 and Fig.11 As shown, when other parts are the same as those in Example 1, the difference between this embodiment and Example 1 is that:

[0056] A PTFE film stretching and sintering device also includes a control system, which is used to control the stretching speed;

[0057] The control system includes: a data collection module, a data analysis module, a data acquisition module and a speed prediction module. The modules are connected by wired / wireless means to realize data transmission.

[0058] The data acquisition module is used to collect comprehensive data information of the stretching and sintering device, wherein the comprehensive data information includes the temperature difference data of the stretching roller 303, the thermal sensitivity data of the film, the thickness data of the film and the humidity data in the stretching and sintering chamber 301.

[0059] Specifically, the temperature difference data of the stretching roller 303 is the difference between the measured temperature of the surface of the stretching roller 303 and the optimal temperature. The measured temperature of the stretching roller 303 can be obtained by measuring with a temperature sensor, and the optimal temperature of the stretching roller 303 is set by the user. The thermosensitivity data of the film can be obtained by measuring with thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) or dynamic thermomechanical analysis (DMA). The thermosensitivity data of the film is user preset data, and the thermosensitivity data of the films of the same batch are assumed to be the same. The thickness data of the film is obtained by measuring with a non-contact sensor, such as a laser displacement sensor or a capacitive displacement sensor. The humidity data in the stretching sintering chamber 301 can be obtained by measuring with a humidity sensor.

[0060] The data analysis module generates a temperature demand coefficient based on the comprehensive data information, and generates a corresponding heating power level based on the temperature demand coefficient;

[0061] The temperature demand factor is generated as follows:

[0062]

[0063] Wherein, Wd is the temperature demand coefficient, Wc is the temperature difference data of the stretching roller 303, Sw is the thermal sensitivity data of the film, Hd is the thickness data of the film, Sd is the humidity data in the stretching sintering chamber 301, and are all weight coefficients, which are determined by technicians in this field according to specific application requirements. and All are greater than 0;

[0064] Among them, the temperature of the stretching roller 303 during operation will affect the temperature of the film. When the temperature of the stretching roller 303 is too low, the temperature of the film will change when it contacts the stretching roller 303. The low surface temperature of the stretching roller 303 will cause local cooling of the film and affect the stretching uniformity. Therefore, the smaller the difference between the actual measured surface temperature of the stretching roller 303 and the preset optimal temperature, the better the stretching effect.

[0065] The higher the thermosensitivity of the film, the lower the melting temperature, and the more precise the control requirements for the stretching temperature to avoid melting of the material due to excessively high temperature; for films with high thermosensitivity, the molecular chains are more likely to move at lower temperatures; for films with high thermosensitivity, the stretching temperature needs to be controlled below its thermal degradation temperature to prevent film degradation. In summary, the higher the thermosensitivity of the film, the lower the stretching temperature required, and the lower the thermosensitivity of the film, the higher the temperature required to achieve the ideal stretching state.

[0066] The thickness of the film has an important influence on its heating rate and heat transfer characteristics. Thicker films require higher temperatures and longer heating times to ensure that the interior reaches the appropriate temperature.

[0067] When the humidity in the stretching sintering chamber 301 is high, there is more water vapor in the air, and the film surface will absorb moisture. During the heating and stretching process, the moisture on the film surface will evaporate, and heat will be absorbed during the evaporation process, resulting in a decrease in the film surface temperature. The evaporative cooling effect will make the local temperature of the film lower than expected, thereby affecting the tensile properties of the material. Therefore, the higher the humidity in the stretching sintering chamber 301, the more it is necessary to increase the heating temperature in the stretching sintering chamber 301 to ensure that the film reaches the required temperature during stretching, and vice versa.

[0068] It should be noted that the formulas involved in the above-mentioned are all calculated by removing dimensions and taking numerical values. They are a formula that is closest to the actual situation obtained by collecting a large amount of data and performing software simulation. The weight coefficients in the formulas and the various preset thresholds in the analysis process are set by technical personnel in this field according to actual conditions or obtained by simulating a large amount of data; the size of the weight coefficient is to quantify each parameter to obtain a specific value for subsequent comparison. The size of the weight coefficient depends on the amount of sample data and the corresponding processing coefficients initially set by technical personnel in this field for each group of sample data; as long as it does not affect the proportional relationship between the parameters and the quantized values.

[0069] The heating power levels are generated as follows:

[0070] The heating power levels include primary heating power, secondary heating power and tertiary heating power, wherein the primary heating power, the secondary heating power and the tertiary heating power are increased in sequence, and the primary heating power, the secondary heating power and the tertiary heating power are all used to control the power of the heater 308;

[0071] The threshold range of the preset temperature demand coefficient is Wd 1 、Wd 2 , Wd 1 <Wd 2 ;

[0072] If Wd≤Wd 1 ,At this time, the data analysis module generates the first-level heating power;

[0073] If Wd 2 ≥Wd>Wd 1 ,At this time, the data analysis module generates the secondary heating power;

[0074] If Wd>Wd 2 ,At this time, the data analysis module generates the third level of heating power.

[0075] Among them, Wd 1 and Wd 2 It is determined by those skilled in the art according to specific application requirements.

[0076] Exemplarily, the power of heater 308 corresponding to the first-level heating power, the second-level heating power and the third-level heating power are 40kW, 45kW and 50kW respectively; the power of heater 308 can also be customized according to specific circumstances; the power of heater 308 is controlled according to the corresponding heating power level.

[0077] A data acquisition module is used to collect a historical training data set of the stretching sintering device, wherein the historical training data set includes the stretching comprehensive influence data and the stretching speed; wherein the stretching comprehensive influence data includes comprehensive data information and power data of the heater 308, and the power data of the heater 308 can be obtained by measuring with a power meter;

[0078] The stretching speed refers to the speed at which the film is stretched when it passes through the stretching roller 303 during the film stretching process. It is usually expressed as the extension of the film length per unit time, and the common unit is meter / minute. The stretching speed can be obtained by calculating the rotation speed of the stretching roller 303. The stretching speed = the circumferential length of the stretching roller 303 × the rotation speed; the rotation speed of the stretching roller 303 can be measured by an encoder or a tachometer.

[0079] The speed prediction module trains a machine learning model for predicting stretching speed based on a historical training data set, collects real-time comprehensive stretching impact data, and inputs it into the trained machine learning model to predict the stretching speed;

[0080] The training method of the machine learning model that predicts the stretching speed includes:

[0081] Convert the collected comprehensive tensile impact data into a corresponding set of feature vectors;

[0082] Each group of feature vectors is used as the input of the machine learning model. The machine learning model takes the stretching speed corresponding to each group of stretching comprehensive impact data as the output, the stretching speed actually corresponding to each group of stretching comprehensive impact data is used as the prediction target, and minimizing the loss function value of the machine learning model is used as the training target; training is stopped when the loss function value of the machine learning model is less than or equal to the preset target loss value.

[0083] The machine learning model may be one of the models such as SVM regression, random forest regression or neural network regression.

[0084] The machine learning model loss function value is the mean square error;

[0085] Mean square error is one of the commonly used loss functions. Minimization is used as the goal to train the model so that the machine learning model better fits the data, thereby improving the performance and accuracy of the model;

[0086] In the loss function, MSE is the loss function value of the machine learning model, x is the feature vector group number; m is the number of feature vector groups; y is the number of feature vector groups; x is the stretching velocity predicted by the x-th group of feature vectors, is the actual stretching speed corresponding to the xth group of eigenvectors;

[0087] Other model parameters of the machine learning model, target loss value, optimization algorithm, training set test set validation set ratio, and loss function optimization are all achieved through actual engineering implementation and continuous experimental tuning.

[0088] The rotation speed of the stretching roller 303 is controlled according to the predicted stretching speed.

[0089] In summary, the control system can predict and control the rotation speed of the stretching roller 303 based on real-time data through the coordinated work of the data acquisition module, the data analysis module, the data acquisition module and the speed prediction module, thereby achieving precise control of the film stretching speed, which is beneficial to improving the uniformity and consistency of film stretching.

[0090] The data analysis module generates a temperature demand coefficient based on comprehensive data information such as the temperature difference of the stretching roller 303, the thermal sensitivity of the film, the thickness of the film and the humidity in the stretching sintering chamber 301, and generates a corresponding heating power level based on this. This dynamic adjustment of the heating power is beneficial to ensure the stability of the temperature in the stretching sintering chamber 301 and improve the stretching effect.

[0091] By precisely controlling the stretching speed and optimizing the heating power, the control system can reduce unevenness and waste in the stretching process, improve production efficiency, reduce the scrap rate caused by uneven stretching or temperature fluctuations, and help reduce production costs.

[0092] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0093] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A PTFE film stretching and sintering device, characterized in that: include: A fixing plate (100); A stretching sintering chamber (301) is installed on the top surface of the fixing plate (100); A plurality of cross bars (302) are rotatably connected to the stretching and sintering chamber (301); A plurality of stretching rollers (303) are respectively fixedly sleeved on the plurality of cross bars (302) and are used to perform a constant force stretching process on the film; A heater (308) installed on the inner bottom surface of the stretching sintering chamber (301); A driving mechanism, used for driving the plurality of cross bars (302) to rotate simultaneously; A cleaning mechanism (310) for cleaning the plurality of stretching rollers (303); An unwinding mechanism (200) is installed on the top surface of the fixed plate (100) and is used to transport the film into the stretching sintering chamber (301); The winding mechanism (400) is installed on the top surface of the fixing plate (100) and is used to wind up the film after being stretched, sintered and formed.

2. A PTFE film stretching and sintering device according to claim 1, characterized in that: The driving mechanism comprises: A plurality of sprockets (305) are respectively sleeved on the portions of the plurality of cross bars (302) located outside the stretching sintering chamber (301); A plurality of chains (306) are sleeved on the plurality of sprocket wheels (305); A protection box (304) is installed on one side of the stretching sintering chamber (301), and the sprocket (305) and the chain (306) are both located in the protection box (304); The driving motor (307) is installed on the protection box (304), and its power output shaft is fixedly connected to the cross bar (302).

3. A PTFE film stretching and sintering device according to claim 1, characterized in that: The cleaning mechanism (310) comprises: A multi-stage electric push rod (311) is installed through the side of the stretching sintering chamber (301); A vertical plate (312) is located in the stretching sintering chamber (301) and is fixedly connected to the extended end of the multi-stage electric push rod (311); A plurality of annular scrapers (313) are mounted on the vertical plate (312) and are used to clean the surfaces of the plurality of stretching rollers (303).

4. A PTFE film stretching and sintering device according to claim 2, characterized in that: The unwinding mechanism (200) comprises: A first fixing frame (201) is installed on the top surface of the fixing plate (100); A first motor (202) mounted on the first fixing frame (201); Two first rotating shafts (203) are both rotatably connected to the first fixed frame (201), and any one of the first rotating shafts (203) is fixedly connected to the power output shaft of the first motor (202); Two first supporting plates (204) are fixedly connected to the two first rotating shafts (203) respectively; A first rotating rod (205) is placed on the two first supporting plates (204); an unwinding roller (206) fixedly sleeved on the first rotating rod (205); Two first baffles (207) are rotatably sleeved on the unwinding roller (206); Two first pressing plates (208), respectively placed on the two first supporting plates (204); Two first bolts (209), wherein the first bolts (209) are used to connect the first supporting plate (204) and the first pressing plate (208).

5. A PTFE film stretching and sintering device according to claim 4, characterized in that: Also includes: Two pairs of support frames (101) are both installed on the bottom surface of the fixing plate (100); Four grooves (102) are respectively formed on the four support frames (101), and the grooves (102) match the first rotating rods (205); The two support blocks (103) are both mounted on the bottom surface of the fixing plate (100).

6. A PTFE film stretching and sintering device according to claim 2, characterized in that: Also included is a control system, the control system comprising: A data acquisition module, used for acquiring comprehensive data information of the stretching and sintering device, wherein the comprehensive data information includes temperature difference data of the stretching roller (303), thermal sensitivity data of the film, thickness data of the film and humidity data in the stretching and sintering chamber (301); The data analysis module generates a temperature demand coefficient based on the comprehensive data information, and generates a corresponding heating power level based on the temperature demand coefficient; A data acquisition module, used for collecting a historical training data set of a stretching sintering device, wherein the historical training data set includes a comprehensive stretching influence data and a stretching speed; The speed prediction module trains a machine learning model to predict the stretching speed based on a historical training data set, collects real-time comprehensive stretching impact data, and inputs it into the trained machine learning model to predict the stretching speed.

7. A PTFE film stretching and sintering device according to claim 6, characterized in that: The temperature demand coefficient is obtained by weighted calculation of the temperature difference data of the stretching roller (303), the thermal sensitivity data of the film, the thickness data of the film and the humidity data in the stretching sintering chamber (301).

8. A PTFE film stretching and sintering device according to claim 6, characterized in that: The heating power levels are generated as follows: The heating power levels include primary heating power, secondary heating power and tertiary heating power, wherein the primary heating power, secondary heating power and tertiary heating power increase in sequence; The threshold range of the preset temperature demand coefficient is Wd1, Wd2, Wd1 <Wd2; If Wd≤Wd1, at this time, the data analysis module generates the first-level heating power; If Wd2≥Wd>Wd1, at this time, the data analysis module generates the secondary heating power; If Wd>Wd2, at this time, the data analysis module generates the third level heating power.

9. A PTFE film stretching and sintering device according to claim 6, characterized in that: The training method of the machine learning model for predicting the stretching speed includes: Convert the collected comprehensive tensile impact data into a corresponding set of feature vectors; Each group of feature vectors is used as the input of the machine learning model. The machine learning model takes the stretching speed corresponding to each group of stretching comprehensive impact data as the output, the stretching speed actually corresponding to each group of stretching comprehensive impact data is used as the prediction target, and minimizing the loss function value of the machine learning model is used as the training target; training is stopped when the loss function value of the machine learning model is less than or equal to the preset target loss value.

10. A PTFE film stretching and sintering device according to claim 9, characterized in that: The machine learning model is one of the models such as SVM regression, random forest regression or neural network regression.

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