A film pulling device and a film leading mechanism thereof

Abstract

The utility model relates to a draw film equipment field, propose a kind of membrane leading mechanism, the membrane leading mechanism drives membrane to sequentially penetrate the preheating furnace and high-temperature sintering furnace;Membrane leading mechanism includes membrane leading motor, first driving sprocket, first auxiliary sprocket, first driven sprocket, second driving sprocket, second auxiliary sprocket, second driven sprocket, membrane leading chain and membrane leading holding rod;The utility model can circulate the membrane leading mechanism that preheating furnace, membrane channel and high-temperature sintering furnace are penetrated, when PTFE film breaks in preheating furnace or high-temperature sintering furnace, only need to wind membrane end on membrane leading holding rod, forward movement is driven by membrane leading motor to membrane leading holding rod, need not manually, need not open safety door to complete film connection, film connection efficiency is high, effectively improve security, ensure that draw film work does not stop;When replacing new film bundle, only need to wind membrane end on membrane leading holding rod to complete, whole process need not manually, greatly save manpower, effectively improve work efficiency.

Description

Technical Field

[0001] This utility model relates to the field of film stretching equipment, and in particular to a high-temperature sintering furnace and its film stretching mechanism. Background Technology

[0002] PTFE is a polymer material with excellent properties, but due to its inherent characteristics, the direct use of virgin PTFE material may have limitations in some applications. Through the film stretching process, the performance of PTFE can be significantly improved and its application areas can be expanded. Existing high-temperature film stretching machines on the market may experience film breakage during the film stretching process. When film breakage occurs, the furnace door needs to be opened for repair. At the same time, due to the extremely high temperature inside the furnace, manual labor is required to use a lifting rod to reattach the broken film to the rollers inside the furnace. The above process is labor-intensive, delays production, and poses safety hazards. To address the aforementioned issues, the inventors proposed a high-temperature film stretching machine, which significantly improves production efficiency after its use. However, the inventors also discovered that the film stretching structure of existing high-temperature film stretching machines is relatively complex, increasing equipment costs. Furthermore, the installation, adjustment, and maintenance processes are time-consuming, affecting normal operation. Additionally, a preheating furnace is located at the top of the high-temperature sintering furnace. While film jamming and breakage do not occur in the preheating furnace, the initial end of the film bundle needs to be manually pulled through the preheating box, resulting in low efficiency for manual film pulling. Utility Model Content

[0003] This invention proposes a film-drawing device. By incorporating a film-drawing mechanism that circulates through the preheating furnace, film channel, and high-temperature sintering furnace, when the PTFE membrane breaks inside the preheating furnace or high-temperature sintering furnace, the membrane end simply needs to be wound around the film-drawing gripper. The film-drawing motor drives the film-drawing chain to rotate cyclically, thereby moving the film-drawing gripper forward. Therefore, film joining can be completed without manual intervention or opening the safety door, resulting in high joining efficiency, significantly improved safety, and ensuring that the film-drawing operation is not interrupted, thus guaranteeing work efficiency. When replacing a new membrane bundle, simply wrap the membrane end around the film-drawing gripper; the entire process requires no manual intervention, greatly saving manpower and effectively improving work efficiency.

[0004] The technical solution of this utility model is implemented as follows: A film-drawing mechanism is installed on a film-drawing device, which includes a support body, a preheating furnace, and a high-temperature sintering furnace. Both the preheating furnace and the high-temperature sintering furnace are mounted on the support body. The preheating furnace is located above or below the high-temperature sintering furnace, and a film channel is provided between the preheating furnace and the high-temperature sintering furnace. A raw material roller is installed on the support body, and a PTFE film is placed on the raw material roller. A film-drawing roller is installed inside the high-temperature sintering furnace, and a traction roller is installed outside the preheating furnace. The film-drawing mechanism drives the film to pass through the preheating furnace and the high-temperature sintering furnace in sequence; The film-drawing mechanism includes: a film-drawing motor, a first driving sprocket, a first auxiliary sprocket, a first driven sprocket, a second driving sprocket, a second auxiliary sprocket, a second driven sprocket, a film-drawing chain, and a film-drawing gripping rod; The film-drawing motor is mounted on the support and is located outside the film-exit end of the high-temperature sintering furnace; The first drive sprocket is connected to the output shaft of the film-drawing motor; The first auxiliary sprocket is rotatably mounted inside the high-temperature sintering furnace; The first driven sprocket is rotatably mounted at the inlet end of the high-temperature sintering furnace; The second drive sprocket is rotatably mounted at the membrane outlet end of the membrane channel; The second auxiliary sprocket is rotatably mounted at the film outlet end of the preheating furnace; The second driven sprocket is rotatably mounted at the inlet end of the preheating furnace; The membrane guide chain is sequentially wound around the first driving sprocket, the first driven sprocket, the second driven sprocket, the second auxiliary sprocket, the second driving sprocket, the first driven sprocket, and the first auxiliary sprocket; The membrane grasping rod is mounted on the membrane chain; The tape end of the PTFE membrane is attached to the film-drawing gripping rod, and the film-drawing gripping rod drives the PTFE membrane to be wound sequentially around the traction roller and the film-pulling roller.

[0005] Furthermore, the first auxiliary sprocket and the film-pulling roller are coaxially arranged and their movements do not affect each other; The second auxiliary sprocket is coaxially arranged with the traction roller and their movements do not affect each other.

[0006] Furthermore, the trajectory of the PTFE membrane and the trajectory of the membrane holding rod are mutually orthogonal projections.

[0007] Furthermore, the number of the first auxiliary sprockets is the same as the number of the film-drawing rollers; The number of the corresponding second auxiliary sprockets is the same as the number of the traction rollers.

[0008] Furthermore, the film-holding rod, the film-pulling roller, and the traction roller are parallel to each other.

[0009] Furthermore, one or more of the film-pulling roller and the traction roller are provided, and correspondingly, one or more of the first auxiliary sprocket and the second auxiliary sprocket are provided.

[0010] Furthermore, both the inlet and outlet ends of the preheating furnace and the high-temperature sintering furnace are provided with feeding ports, and anti-wear rollers are provided vertically aligned on the inner and outer sides of the feeding ports. The PTFE membrane passes through the middle of the anti-abrasion rollers that are aligned vertically.

[0011] Furthermore, the support body is provided with a plurality of proximity switches, which are arranged adjacent to the lead-in chain; Multiple proximity switches are sequentially and dispersedly installed on the side of the movement trajectory of the lead-in chain.

[0012] Furthermore, the raw material roller is connected to a feeding rack reversing mechanism.

[0013] Furthermore, a film-stretching device includes the aforementioned film-drawing mechanism.

[0014] This invention features a membrane-drawing mechanism that circulates through the preheating furnace, membrane channel, and high-temperature sintering furnace. When the PTFE membrane breaks inside the preheating furnace or high-temperature sintering furnace, the membrane end simply needs to be wrapped around the membrane-drawing gripper. The membrane-drawing motor drives the membrane-drawing chain to rotate cyclically, thereby moving the membrane-drawing gripper forward. Therefore, membrane splicing can be completed without manual intervention or opening the safety door, resulting in high splicing efficiency, improved safety, and ensuring that the membrane-drawing process is not interrupted, thus guaranteeing work efficiency. When replacing a new membrane bundle, simply wrap the membrane end around the membrane-drawing gripper; the entire process requires no manual intervention, greatly saving manpower and effectively improving work efficiency. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a simplified structural diagram of a film stretching device according to a specific embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the cooperation structure between the first auxiliary sprocket and the film-stretching roller of a film-stretching device is shown. Explanation of reference numerals in the attached drawings: Support body 1; Preheating furnace 2; High-temperature sintering furnace 3; Membrane channel 4; Film guiding mechanism 5 includes: Film guiding motor 51; First driving sprocket 52; First auxiliary sprocket 53; First driven sprocket 54; Second driving sprocket 55; Second auxiliary sprocket 56; Second driven sprocket 57; Film guiding chain 58; Film guiding gripping rod 59; Anti-wear roller 6; Film pulling roller 7; In the attached diagram, the first auxiliary sprocket and the second auxiliary sprocket coincide with the film-pulling roller and the traction roller, respectively. Detailed Implementation

[0017] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0018] In a specific embodiment of this utility model, see Figures 1-2 A film stretching device includes a support body 1, a preheating furnace 2, and a high-temperature sintering furnace 3. The preheating furnace 2 and the high-temperature sintering furnace 3 are both installed on the support body 1. The preheating furnace 2 is located above or below the high-temperature sintering furnace 3 (this application uses the upper part as an example). A film channel 4 is reserved between the preheating furnace 2 and the high-temperature sintering furnace 3. A raw material roller is installed on the support body 1 and is located near the film inlet end of the preheating furnace 2. A PTFE film is placed on the raw material roller. A forming roller is also provided on the support body 1 and is located near the film outlet end of the high-temperature sintering furnace. Feed ports are provided at the inlet and outlet ends of the preheating furnace 2 and the high-temperature sintering furnace 3. The preheating furnace 2 is equipped with traction rollers outside, and the high-temperature sintering furnace 3 is equipped with film-pulling rollers inside; The PTFE membrane is heated in the preheating furnace 2 and then stretched in the high-temperature sintering furnace 3; in the aforementioned process, the PTFE membrane passes through the traction roller and the film stretching roller in sequence; The normal film stretching process is as follows: Before starting, open the safety door, and manually insert the strip end of the PTFE membrane into the preheating furnace 2 through the feeding port on the left side of the preheating furnace 2. After being heated in the preheating furnace 2, it exits through the feeding port on the right side of the preheating furnace 2. Then, under the action of the traction roller, it passes through the membrane channel 4, and then enters the high-temperature sintering furnace 3 through the feeding port at the inlet end of the high-temperature sintering furnace 3. It then passes around the film stretching rollers in the high-temperature sintering furnace 3 in sequence, and then exits the high-temperature sintering furnace 3 through the feeding port at the outlet end of the high-temperature sintering furnace 3. Finally, it is attached to the forming roller. After completing the above process, start the film stretching roller to stretch the film. If a break occurs during the film stretching process, the above process needs to be repeated manually. Because the PTFE membrane needs to be preheated in the preheating furnace 2 and then stretched in the high-temperature sintering furnace 3, if a break occurs during the preheating or stretching process, the respective safety doors need to be opened and the process needs to be repeated manually using a lifting rod. First, manual material handling is inefficient, which seriously affects production efficiency. Second, it is necessary to overcome the high-temperature environment in the preheating furnace 2 and the high-temperature sintering furnace 3, which may cause certain safety hazards. Moreover, manual operation requires waiting for the temperature in the preheating furnace 2 and the high-temperature sintering furnace 3 to drop to a tolerable level before proceeding, which takes a long time and affects the normal membrane stretching process. The equipment also needs to be paused when a new membrane bundle needs to be replaced. Furthermore, after several months of practice, the structure of the auxiliary rollers in the high-temperature sintering furnace of the previous film-drawing mechanism was relatively complex, and a series of problems were discovered during use. Based on the above reasons, in order to better ensure the normal, orderly and efficient operation of the film stretching work, a film pulling mechanism that can pass through the preheating furnace, film channel and high-temperature sintering furnace was added to the original equipment. The film pulling work is completely replaced by machinery, which effectively ensures the normal operation of the film stretching work.

[0019] In a specific embodiment of this utility model, see Figure 1 A film-drawing mechanism 5 is installed on the support body 1 of the film-drawing equipment. The film-drawing mechanism 5 drives the film to pass through the preheating furnace 2 and the high-temperature sintering furnace 3 in sequence. Whether it is the traction at the beginning end of the film roll or the traction after breakage, the film-drawing mechanism 5 can drive the end of the PTFE film to pass through the preheating furnace 2 and the high-temperature sintering furnace 3 in sequence, and finally wind it onto the forming roller. Except for special situations such as maintenance, there is no need to open the safety doors on the preheating furnace 2 and the high-temperature sintering furnace 3, which greatly improves the safety of the operation. Moreover, the whole process is replaced by machines, eliminating the need to wait for cooling and improving work efficiency.

[0020] In a specific embodiment of this utility model, see Figure 1 The film-guiding mechanism 5 includes: a film-guiding motor 51, a first driving sprocket 52, a first auxiliary sprocket 53, a first driven sprocket 54, a second driving sprocket 55, a second auxiliary sprocket 56, a second driven sprocket 57, a film-guiding chain 58, and a film-guiding gripping rod 59. Furthermore, the film-drawing motor 51 is detachably mounted on the support body 1 through the cooperation of the motor base and bolts, and is located outside the film outlet end of the high-temperature sintering furnace 3, ensuring that the film-drawing motor 51 is not affected by the high temperature inside the furnace and ensuring its service life. When the PTFE membrane breaks, the film-drawing motor 51 starts to work. Furthermore, the first driving sprocket 52 is connected to the output shaft of the film-drawing motor 51 via a coupling and is located outside the furnace body. When the film-drawing motor 51 is working, the output shaft of the film-drawing motor 51 will drive the driving sprocket to rotate synchronously. The first auxiliary sprocket 53 is rotatably installed inside the high-temperature sintering furnace 3, and the setting trajectory of the first auxiliary sprocket 53 is set with reference to the setting trajectory of the film-drawing roller. The first driven sprocket 54 is rotatably installed at the film-feeding end of the high-temperature sintering furnace 3. The second driving sprocket 55 is rotatably mounted on the membrane outlet end of the membrane channel 4; the second auxiliary sprocket 56 is rotatably mounted on the membrane outlet end of the preheating furnace 2; the second driven sprocket 57 is rotatably mounted on the membrane inlet end of the preheating furnace 2; the membrane guide chain 58 is sequentially wound around the first driving sprocket 52, the first driven sprocket 54, the second driven sprocket 57, the second auxiliary sprocket 56, the second driving sprocket 55, the first driven sprocket 54, and the first auxiliary sprocket 53; With the aforementioned setup, the film-drawing chain 58 can circulate sequentially through the preheating furnace 2 and the high-temperature sintering furnace 3, thereby completing the film drawing process. Furthermore, the film-drawing gripping rod 59 is installed on the film-drawing chain 58. The film-drawing gripping rod 59 can be installed on the film-drawing chain by means of bolt and screw hole connection or welding. The tape end of the PTFE membrane (the tape end can be the starting end of the PTFE membrane or the sheared head after the PTFE membrane breaks) is attached to the film-drawing gripping rod 59. The film-drawing gripping rod 59 drives the PTFE membrane to pass through the preheating furnace 2 and the high-temperature sintering furnace 3 in sequence. During the cyclic movement of the film-drawing chain 58, it will drive the film-drawing gripping rod 59 to cyclically move, thereby ensuring that the film-drawing gripping rod 59 can pass through the preheating furnace 2 and the high-temperature sintering furnace 3 in sequence by mechanically driving the broken end of the PTFE membrane when the safety door is closed, ensuring that the film-drawing operation is not interrupted. The tape end of the PTFE membrane is attached (or wound) to the film-drawing gripping rod 59 (it must be ensured that the PTFE membrane will not detach from the film-drawing gripping rod 59 during the traction process). The film-drawing gripping rod 59 drives the PTFE membrane to be wound around the traction roller and the film-pulling roller in sequence, so that the membrane can pass through the preheating furnace 2 and the high-temperature sintering furnace 3 in sequence. The first driving sprocket 52, the first auxiliary sprocket 53, the first driven sprocket 54, the second driving sprocket 55, the second auxiliary sprocket 56, the second driven sprocket 57, and the film-guiding chain 58 work together to form a closed-loop circulation path, ensuring that the film-guiding holding rod 59 can perform film-guiding work at any time.

[0021] In a specific embodiment of this utility model, see Figure 1 , Figure 2The first auxiliary sprocket 53 is coaxially arranged with the film-pulling roller and their movements do not affect each other; specifically, the film-pulling roller 7 is configured as a hollow roller, and the rotating shaft of the first auxiliary sprocket 53 is suspended and fitted inside the film-pulling roller 7 (or a bearing 8 can be fitted on the rotating shaft 531 of the first auxiliary sprocket 53, and the film-pulling roller 7 can be rotatably fitted through the bearing 8, see details). Figure 2 This ensures that the rotation of the film pulling roller and the first auxiliary sprocket 53 does not affect each other; it also ensures that the running trajectory of the PTFE in the film pulling box and the running trajectory of the film pulling gripping rod 59 are mutually orthogonal projections, that is, the movement trajectory of the film pulling gripping rod 59 is in line with the running trajectory of the PTFE film, ensuring that the film pulling gripping rod 59 can pull the PTFE film to the corresponding position. Correspondingly, the traction roller and the second auxiliary sprocket 56 are coaxially arranged and their movements do not affect each other; specifically, the traction roller is set as a hollow roller, and the rotating shaft of the second auxiliary sprocket 56 is suspended and fitted inside the traction roller (or a bearing can be fitted on the rotating shaft of the second auxiliary sprocket 56, and rotatably fitted inside the traction roller through the bearing), ensuring that the rotation of the traction roller and the second auxiliary sprocket 56 does not affect each other; ensuring that the running trajectory of the PTFE membrane at the traction roller outside the preheating box and the trajectory of the film-holding rod 59 at the corresponding position are mutually orthogonal projections; When the film-holding rod 59 drives the PTFE film through the traction roller or the film-pulling roller, the PTFE film is precisely attached to the traction roller or the film-pulling roller. This structure is simpler, and the winding of the PTFE membrane is smoother. It simplifies the structure while ensuring the normal, orderly, and efficient operation of the film pulling process. It also ensures that the PTFE membrane can be accurately and effectively attached to the traction roller or film pulling roller. The outer diameter of the second auxiliary sprocket must not be smaller than the outer diameter of the film-pulling roller.

[0022] In a specific embodiment of this utility model, see Figure 1 The first driven sprocket 54 has three parts, with two driven sprockets on the left and one driven sprocket and the driving sprocket on the right. The three driven sprockets and the driving sprocket provide a quadrilateral running trajectory for the film guiding chain, so that the upward and downward trajectories of the running trajectory are spaced apart by a certain distance, thereby realizing a continuous cyclic trajectory from inside the furnace to outside the furnace and from outside the furnace to inside the furnace; that is, the film guiding rod 59 enters the furnace from the left side of the furnace body, exits from the right side of the furnace body, and returns to its original position from the bottom of the furnace body.

[0023] In a specific embodiment of this utility model, see Figure 1 : In a specific embodiment of this utility model, see Figure 1 The number of the first auxiliary sprockets 53 is the same as the number of the film-pulling rollers; That is, the number of first auxiliary sprockets 53 was reduced, simplifying the structure; At the same time, it ensures that the outer contour of the first auxiliary sprocket 53 and the outer contour of the film pulling roller are mutually orthogonal projections, and ensures that the running trajectory of the film pulling gripping rod 59 and the running trajectory of the PTFE film are mutually orthogonal projections, so as to ensure that the film pulling gripping rod 59 can accurately pull the PTFE film onto the film pulling roller. The number of second auxiliary sprockets 56 is the same as that of the traction rollers, and their function is the same.

[0024] In a specific embodiment of this utility model, see Figure 1 The film-holding rod 59, the film-pulling roller, and the traction roller are parallel to each other (ignoring the tilt caused by vibration). Ensure that the film-holding rod 59 can drive the PTFE film to be accurately attached to the traction roller or film-pulling roller; The running trajectory of the film-drawing gripping rod 59 is consistent with the running trajectory of the PTFE membrane during the film-drawing process, thereby ensuring that the film-drawing gripping rod 59 can drive the tape end of the PTFE membrane to pass around the traction roller and the film-drawing roller, and thus pass through the preheating furnace 2 and the high-temperature sintering furnace 3 in sequence; therefore, the film-drawing gripping rod 59 is set to always be parallel to the traction roller and the film-drawing roller, and the traction roller, the film-drawing roller and the film-drawing gripping rod 59 are all cylindrical; Meanwhile, in order to ensure the stability of the membrane holding rod 59 during operation and the stability of the PTFE membrane traction, two sets of membrane pulling chains can be set up, and matched with the corresponding first driving sprocket 52, first driven sprocket 54, first auxiliary sprocket 53, second driving sprocket 55, second driven sprocket 57, and second auxiliary sprocket 56.

[0025] In a specific embodiment of this utility model, see Figure 1 One or more of the film-pulling roller and the traction roller are provided, and correspondingly, one or more of the first auxiliary sprocket 53 and the second auxiliary sprocket 56 are provided. To ensure that the PTFE membrane can be accurately attached to the traction roller or film pulling roller, the number of first auxiliary sprockets 53 is the same as the number of film pulling rollers, and the number of second auxiliary sprockets 56 is the same as the number of traction rollers. When multiple traction rollers are required to achieve the folding of PTFE membrane, multiple traction rollers are set, and in this case, multiple second auxiliary sprockets 56 are set. When it is necessary to stretch the PTFE membrane to a set thickness, multiple film stretching rollers are required. In this case, multiple first auxiliary sprockets 53 are provided.

[0026] In a specific embodiment of this utility model, see Figure 1 The preheating furnace 2 and the high-temperature sintering furnace 3 are both provided with feeding ports at the inlet and outlet ends of the film, and anti-wear rollers 6 are provided vertically aligned on the inner and outer sides of the feeding ports. The PTFE membrane passes through the middle of the anti-wear rollers 6 arranged vertically and horizontally; Since the feeding port is a flat, elongated opening on the left and right sides of the preheating furnace 2 and the high-temperature sintering furnace 3, and the preheating furnace 2 and the high-temperature sintering furnace 3 are made of metal, there is a possibility of wear. At the same time, the thickness of the preheating furnace 2 and the high-temperature sintering furnace 3 is small, and the trajectory of the film-leading chain is not horizontal. Therefore, the PTFE membrane may get stuck at the upper or lower end of the feeding port, causing wear. In order to ensure that the PTFE membrane can enter the preheating furnace 2 or the high-temperature sintering furnace 3 horizontally and prevent wear, anti-wear rollers 6 are arranged vertically aligned on both the inner and outer sides of the feeding port. There is a certain horizontal gap between the anti-wear rollers 6 and the preheating furnace 2 or the high-temperature sintering furnace 3. At this time, the PTFE membrane passes through the middle of the anti-wear rollers 6 arranged on the upper and lower sides before entering the preheating furnace 2 or the high-temperature sintering furnace 3, ensuring that the film-leading gripping rod 59 can pass smoothly horizontally, effectively preventing wear and ensuring the integrity of the PTFE membrane.

[0027] In a specific embodiment of this utility model, see Figure 1 The support 1 is provided with a plurality of proximity switches, which are arranged adjacent to the lead-in chain; Multiple proximity switches are sequentially and dispersedly installed on the side of the movement trajectory of the lead-in chain; The proximity switch is used to limit the temporary stopping position of the film pulling gripping rod 59. When the proximity switch senses the film pulling gripping rod 59, the film pulling motor 51 temporarily stops running, and the film pulling gripping rod 59 stops at the corresponding position. Furthermore, one or more proximity switches are provided; Multiple proximity switches are distributed and installed around the running trajectory of the lead-in chain; Currently, there are six proximity switches, including the first proximity switch on the left and the second proximity switch on the right of the preheating furnace 2, the third proximity switch on the left and the fourth proximity switch on the right of the membrane channel 4, and the fifth proximity switch on the left and the sixth proximity switch on the right of the high-temperature sintering furnace 3. The number of switches will be increased or decreased as needed in the future according to the adjustment. The current six switches are installed near the feed ports at both ends of the preheating furnace 2 and the high-temperature sintering furnace 3, as well as at both ends of the membrane channel 4, as shown in the attached figure. When the PTFE membrane breaks, the connection between the two ends of the preheating furnace 2 and the high-temperature sintering furnace 3 is manually cut off, and the broken PTFE membrane material is pulled out from the feeding ports at both ends of the preheating furnace 2 and the high-temperature sintering furnace 3. At the same time, the strip end of the new PTFE membrane is attached to the film-drawing gripping rod 59, and the film-drawing motor 51 is started. The film-drawing motor 51 drives the first drive sprocket 52 to rotate, which in turn drives the film-drawing chain to rotate, and finally drives the film-drawing gripping rod 59 to move, so that the PTFE membrane is sequentially wound around the corresponding traction roller or film-drawing roller. When the film-drawing gripping rod 59 passes through the preheating furnace 2, the membrane channel 4 or the high-temperature sintering furnace 3, the proximity switch on the right side of the preheating furnace 2, the left side of the membrane channel 4 or the right side of the high-temperature sintering furnace 3 senses the film-drawing gripping rod 59, and the film-drawing motor 51 is turned off. Then, the strip end of the PTFE membrane after film drawing is manually wound around the forming roller, and then the film drawing equipment operates normally. At the same time, the film-drawing motor 51 starts working again, driving the film-drawing gripping rod 59 to continue moving forward. An initial position is also provided, which can be set according to specific circumstances. The initial position is equipped with a proximity switch. When the sensor of the initial position approaches and detects the film-guiding gripping rod 59, the film-guiding motor 51 stops working and the film-guiding gripping rod 59 returns to the initial position.

[0028] In a specific embodiment of this utility model, see Figures 1-2 The raw material roller is connected to a feeding rack reversing mechanism. When a film breakage occurs, the feeding rack reversing mechanism drives the raw material roller to reverse, retracting the tail film in the furnace without the need for manual film pulling. An appropriate number of membrane breakage sensors can be installed on the side of the PTFE membrane's running path. After detecting a membrane breakage, the membrane breakage sensor will transmit the membrane breakage signal to the feeding rack reversing mechanism. The membrane breakage sensor can detect various signals. For example, it can be set to determine that the membrane is broken if no membrane is detected for 0.2 seconds.

[0029] In a specific embodiment of this utility model, see Figures 1-2 The specific work process is as follows: During the operation of the film stretching equipment, the PTFE membrane in the preheating furnace 2 is in a preheating state, and the PTFE membrane in the high-temperature sintering furnace 3 is in a film stretching state. Due to time errors, speed errors of the traction roller and the film stretching roller, the PTFE membrane may break during the film stretching process. When the film pulling equipment is operating normally, the film pulling gripping rod 59 is in the initial position; When a break occurs, first cut the PTFE membrane on the outside of both ends of the preheating furnace 2 or the high-temperature sintering furnace 3. At the same time, the film pulling motor 51 works to bring the film pulling holding rod 59 to the left end of the preheating furnace 2 or the left end of the high-temperature sintering furnace 3. The film pulling motor 51 then stops working. Then, attach the strip end at the broken end on the left to the film pulling holding rod 59. Then, pull out the broken PTFE membrane through the feeding ports on both sides of the preheating furnace 2 or the high-temperature sintering furnace 3. Then the film-drawing motor 51 is started again. The film-drawing motor 51 drives the first drive sprocket 52 to rotate, which in turn drives the film-drawing chain, the second driven sprocket 57, the second auxiliary sprocket 56, the second drive sprocket 55, the first driven sprocket 54 and the first auxiliary sprocket 53 to rotate, which in turn drives the film-drawing gripping rod 59 to move along the set trajectory. During the movement of the film holding rod 59, the PTFE film belt end will pass through the feeding port on the left side of the preheating furnace 2 or the high-temperature sintering furnace 3, and successively pass around the traction rollers on the right side of the preheating furnace 2 or the multiple film pulling rollers in the high-temperature sintering furnace 3. When the PTFE film passes around the traction rollers or film pulling rollers, it will be attached to them in sequence. The film-guiding gripping rod 59 is continuously carried out by the film-guiding chain from the preheating furnace 2, the membrane channel 4, and the high-temperature sintering furnace 3 to its initial position. At this time, the film-guiding gripping rod 59 completes one cycle and returns to its original position, waiting for the next traction operation. After the film-pulling gripping rod 59 moves to a position other than the initial position, when the proximity switch at the initial position senses the film-pulling gripping rod 59, the film-pulling motor 51 stops running. At this time, the PTFE film is manually attached to the forming roller, and the film-pulling equipment starts to run normally again. When replacing with a new PTFE membrane bundle, repeat the above process; During the above process, there is no need to open the safety door, and all operations are carried out outside the preheating furnace 2 or the high-temperature sintering furnace 3, ensuring the safety of the workers. Furthermore, there is no need to wait for the temperature to drop inside the preheating furnace 2 or the high-temperature sintering furnace 3, which improves work efficiency; Meanwhile, the operator only needs to cut the broken PTFE membrane, pull it out of the preheating furnace 2 or high-temperature sintering furnace 3, and attach the end of the strip to the film-drawing gripping rod 59 and the forming roller. The operation is simple and efficient, which greatly improves the efficiency of resuming work and further improves the film-drawing efficiency.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A film-drawing mechanism, installed on a film-drawing device, the film-drawing device comprising a support body, a preheating furnace, and a high-temperature sintering furnace, wherein the preheating furnace and the high-temperature sintering furnace are both installed on the support body, the preheating furnace being located above or below the high-temperature sintering furnace, and a film channel is reserved between the preheating furnace and the high-temperature sintering furnace; a raw material roller is installed on the support body, and a PTFE film is placed on the raw material roller; a film-drawing roller is provided inside the high-temperature sintering furnace, and a traction roller is provided outside the preheating furnace; Its features are: The film-drawing mechanism drives the film to pass through the preheating furnace and the high-temperature sintering furnace in sequence; The film-drawing mechanism includes: a film-drawing motor, a first driving sprocket, a first auxiliary sprocket, a first driven sprocket, a second driving sprocket, a second auxiliary sprocket, a second driven sprocket, a film-drawing chain, and a film-drawing gripping rod; The film-drawing motor is mounted on the support and is located outside the film-exit end of the high-temperature sintering furnace; The first drive sprocket is connected to the output shaft of the film-drawing motor; The first auxiliary sprocket is rotatably mounted inside the high-temperature sintering furnace; The first driven sprocket is rotatably mounted at the inlet end of the high-temperature sintering furnace; The second drive sprocket is rotatably mounted at the membrane outlet end of the membrane channel; The second auxiliary sprocket is rotatably mounted at the film outlet end of the preheating furnace; The second driven sprocket is rotatably mounted at the inlet end of the preheating furnace; The membrane guide chain is sequentially wound around the first driving sprocket, the first driven sprocket, the second driven sprocket, the second auxiliary sprocket, the second driving sprocket, the first driven sprocket, and the first auxiliary sprocket; The membrane grasping rod is mounted on the membrane chain; The tape end of the PTFE membrane is attached to the film-drawing gripping rod, and the film-drawing gripping rod drives the PTFE membrane to be wound sequentially around the traction roller and the film-pulling roller.

2. The membrane-attaching mechanism as described in claim 1, characterized in that: The first auxiliary sprocket and the film-pulling roller are coaxially arranged and their movements do not affect each other; The second auxiliary sprocket is coaxially arranged with the traction roller and their movements do not affect each other.

3. The membrane-attaching mechanism as described in claim 1, characterized in that: The trajectory of the PTFE membrane and the trajectory of the membrane holding rod are mutually orthogonal projections.

4. The membrane-attaching mechanism as described in claim 2, characterized in that: The number of the first auxiliary sprockets is the same as the number of the film-pulling rollers; The number of the corresponding second auxiliary sprockets is the same as the number of the traction rollers.

5. A membrane-attaching mechanism as described in claim 2, characterized in that: The film-holding rod, the film-pulling roller, and the traction roller are parallel to each other.

6. The membrane-attaching mechanism as described in claim 1, characterized in that: One or more of the film-pulling roller and the traction roller are provided, and correspondingly, one or more of the first auxiliary sprocket and the second auxiliary sprocket are provided.

7. The membrane-attaching mechanism as described in claim 1, characterized in that: Both the preheating furnace and the high-temperature sintering furnace are provided with feeding ports at the inlet and outlet ends of the film, and anti-wear rollers are provided vertically aligned on the inner and outer sides of the feeding ports. The PTFE membrane passes through the middle of the anti-abrasion rollers that are aligned vertically.

8. The membrane-attaching mechanism as described in claim 1, characterized in that: The support is provided with a plurality of proximity switches, which are arranged adjacent to the lead-in chain. Multiple proximity switches are sequentially and dispersedly installed on the side of the movement trajectory of the lead-in chain.

9. A membrane-attaching mechanism as described in claim 1, characterized in that: The raw material roller is connected to a feeding rack reversing mechanism.

10. A film stretching device, characterized in that: Includes the membrane-applying mechanism as described in any one of claims 1-6.

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