Transverse drawing device for polytetrafluoroethylene film

Abstract

The utility model relates to a polytetrafluoroethylene film transverse drawing device, which relates to the technical field of polytetrafluoroethylene film production equipment, and comprises a rack, two oppositely arranged guide plates arranged on the rack, two groups of chain tongs respectively wound on different guide plates, and a driving piece used for driving the chain tongs to move around the guide plates opposite to the chain tongs, a conveying channel is formed between the two sets of chain tongs, the feeding end of the conveying channel is provided with a feeding plate with the same height as clamping openings of the chain tongs, and the machine frame is provided with a flattening structure used for flattening a polytetrafluoroethylene longitudinal pulling belt placed on the feeding plate. The flattening structure is started to flatten the polytetrafluoroethylene longitudinal pulling belt, and along with the movement of the chain tongs, the flat polytetrafluoroethylene longitudinal pulling belt is clamped and conveyed by the two groups of chain tongs, so that the polytetrafluoroethylene longitudinal pulling belt flatly enters the subsequent transverse pulling process step to be heated and transversely pulled, and the probability of clamp disengaging is reduced; and meanwhile, the convenience and the uniformity of subsequent transverse drawing are improved, so that the drawing effect of the polytetrafluoroethylene film is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of polytetrafluoroethylene film production equipment, in particular to a transverse stretching device for polytetrafluoroethylene films. Background Art

[0002] Polytetrafluoroethylene is a high molecular polymer prepared by polymerizing tetrafluoroethylene as a monomer, and has excellent heat resistance and cold resistance. The polytetrafluoroethylene film, abbreviated as PTFE film, is a microporous film made of polytetrafluoroethylene as raw material by special processes such as calendering, extrusion, and biaxial stretching. PTFE films can be classified into clothing films, air filtration films, air purification films, etc. according to their uses.

[0003] The polytetrafluoroethylene film is first longitudinally stretched by a longitudinal stretching device to become a polytetrafluoroethylene longitudinal stretching belt, and then the polytetrafluoroethylene longitudinal stretching belt enters a transverse stretching machine for transverse stretching. The polytetrafluoroethylene film after biaxial stretching is trimmed and wound into a finished roll film. When entering the transverse stretching machine, the polytetrafluoroethylene longitudinal stretching belt is usually clamped and conveyed by a conveying chain and chain clips. When the longitudinal stretching belt wrinkles, it is easy to cause the film clips to be disengaged, or cause the film surface of the transverse stretched film to be uneven, which not only affects the appearance of the finished product, but also may cause uneven performance (such as resistance and efficiency, etc.) of the finished film. Therefore, it is necessary to flatten the polytetrafluoroethylene longitudinal stretching belt before entering the transverse stretching machine. Summary of the Utility Model

[0004] In order to improve the stretching effect of polytetrafluoroethylene films, the utility model provides a transverse stretching device for polytetrafluoroethylene films.

[0005] A transverse stretching device for polytetrafluoroethylene films provided by the present application adopts the following technical solutions:

[0006] A transverse stretching device for polytetrafluoroethylene films includes a frame, two oppositely arranged guide plates provided on the frame, two groups of chain clips respectively wound around different guide plates, and a driving member for driving the chain clips to move around the guide plates opposite thereto. A conveying channel for the polytetrafluoroethylene longitudinal stretching belt to pass through is formed between the two groups of chain clips. A loading plate having the same height as the clamping opening of the chain clips is provided at the feeding end of the conveying channel. A flattening structure for flattening the polytetrafluoroethylene longitudinal stretching belt placed on the loading plate is provided on the frame.

[0007] By adopting the above technical solution, the chain clips clamp the polytetrafluoroethylene longitudinal drawing belt, the driving member starts to drive the chain clips to rotate around the guide plate, and at the same time the flattening structure starts to flatten the polytetrafluoroethylene longitudinal drawing belt. As the chain clips move, the flat polytetrafluoroethylene longitudinal drawing belt is clamped and conveyed by the two groups of chain clips, so that the polytetrafluoroethylene longitudinal drawing belt enters the subsequent transverse drawing process steps for heating and transverse drawing. By flattening the polytetrafluoroethylene longitudinal drawing belt first and then entering the transverse drawing step, the probability of unclamping is reduced, and at the same time the convenience and uniformity of the subsequent transverse drawing are improved, thereby improving the stretching effect of the polytetrafluoroethylene film.

[0008] Optionally, a sprocket driven by a driving member is provided at the feeding end of the guide plate, the chain clip is arranged in cooperation with the sprocket, and the two sprockets are respectively located on both sides of the feeding end of the conveying channel.

[0009] By adopting the above technical solution, the driving member starts to drive the sprocket to move, the sprocket drives the chain clip to move, the chain clip clamps and conveys the polytetrafluoroethylene longitudinal drawing belt, and the polytetrafluoroethylene longitudinal drawing belt moves along the conveying channel under the action of the chain clip and enters the transverse drawing step, thereby realizing the movement of the polytetrafluoroethylene longitudinal drawing belt.

[0010] Optionally, a support plate is fixedly arranged on the frame above the sprocket, and the flattening structure is arranged on the support plate.

[0011] By adopting the above technical solution, the flattening structure is arranged on the support plate, thereby reducing the probability that the rotation of the sprocket has an adverse effect on the operation of the flattening structure, and thereby improving the working stability of the flattening structure.

[0012] Optionally, the flattening structure includes:

[0013] A fixed seat, the fixed seat is arranged on the support plate;

[0014] A blowing air pipe, the blowing air pipe is arranged on the fixed seat and extends obliquely downward, and the end of the blowing air pipe away from the fixed seat faces the polytetrafluoroethylene longitudinal drawing belt on the feeding plate;

[0015] An air inlet pipe, the inlet end of the air inlet pipe is connected to the air source and the outlet end is connected to the blowing air pipe.

[0016] By adopting the above technical solution, the gas enters the blowing air pipe after passing through the air source and the air inlet pipe and is blown out from the blowing air pipe. The gas blows towards the polytetrafluoroethylene longitudinal drawing belt on the feeding plate, so that the wrinkled polytetrafluoroethylene longitudinal drawing belt extends flat and is clamped and conveyed by the chain clip, thereby improving the flatness of the polytetrafluoroethylene longitudinal drawing belt, and thereby improving the stretching effect of the polytetrafluoroethylene film.

[0017] Optionally, there are two support plates, which correspond to the sprockets one by one. There are two fixing seats, which correspond to the support plates one by one. The fixing seats are arranged on the corresponding support plates. There are two air blowing pipes, which correspond to the fixing seats one by one. The two air blowing pipes are respectively oriented towards different sides of the polytetrafluoroethylene longitudinal stretching belt.

[0018] By adopting the above technical solution, according to the wrinkled position of the polytetrafluoroethylene longitudinal stretching belt, the air blowing pipe on the corresponding side is selected for blowing, or the two air blowing pipes can be started synchronously to blow different positions, so as to improve the effect of flattening the polytetrafluoroethylene, and thus improve the flatness of the polytetrafluoroethylene longitudinal stretching belt.

[0019] Optionally, magnets are provided on the fixing seats, and the fixing seats are adsorbed on the corresponding support plates through the magnets.

[0020] By adopting the above technical solution, the adsorption of the magnets improves the convenience of installation and position adjustment of the fixing seats.

[0021] In summary, the present application includes at least one of the following beneficial technical effects:

[0022] 1. The chain clamps clamp the polytetrafluoroethylene longitudinal stretching belt. The driving member is started to drive the chain clamps to rotate around the guide plate. At the same time, the flattening structure is started to flatten the polytetrafluoroethylene longitudinal stretching belt. As the chain clamps move, the flat polytetrafluoroethylene longitudinal stretching belt is clamped and conveyed by the two groups of chain clamps, so that the polytetrafluoroethylene longitudinal stretching belt enters the subsequent transverse stretching process steps for heating and transverse stretching. By flattening the polytetrafluoroethylene longitudinal stretching belt first and then entering the transverse stretching step, the probability of de-clamping is reduced, and at the same time, the convenience and uniformity of the subsequent transverse stretching are improved, so as to improve the stretching effect of the polytetrafluoroethylene film.

[0023] 2. The gas enters the air blowing pipe after passing through the gas source and the air inlet pipe and is blown out from the air blowing pipe. The gas blows towards the polytetrafluoroethylene longitudinal stretching belt located on the loading plate, so that the wrinkled polytetrafluoroethylene longitudinal stretching belt extends flatly and is clamped by the chain clamps for flat conveyance, thereby improving the flatness of the polytetrafluoroethylene longitudinal stretching belt, and thus improving the stretching effect of the polytetrafluoroethylene film. Description of the Drawings

[0024] Figure 1 is the top view of the overall structure of the present application;

[0025] Figure 2 is the schematic diagram of the conveying channel in the present application;

[0026] Figure 3 is the schematic diagram of the positions of the two sprockets in the present application;

[0027] Figure 4 is the exploded view of the sprocket and the baffle in the present application;

[0028] Figure 5 It is a schematic structural diagram of the flattening structure in this application;

[0029] Figure 6 It is an exploded view of the fixed seat and the magnet in this application.

[0030] Reference numerals: 1, frame; 11, guide plate; 12, driving member; 13, conveying channel; 14, transverse stretching box; 15, sprocket; 16, driving rod; 161, baffle plate; 2, chain clip; 21, chain link; 22, film clip; 3, loading plate; 31, avoidance groove; 4, flattening structure; 41, fixed seat; 411, magnet; 42, air blowing pipe; 43, air inlet pipe; 5, support plate; 51, connecting plate; 52, screw; 53, nut; 54, scale. Detailed implementation manners

[0031] The following further describes this application in detail with reference to the attached Figures 1-6 drawings.

[0032] The embodiment of this application discloses a transverse stretching device for polytetrafluoroethylene film.

[0033] Referring to Figure 1 and Figure 2 , a transverse stretching device for polytetrafluoroethylene film includes a frame 1, two oppositely arranged guide plates 11 provided on the frame 1, two groups of chain clips 2 respectively wound around different guide plates 11, and a driving member 12 for driving the chain clips 2 to move around the corresponding guide plates 11. A conveying channel 13 for the polytetrafluoroethylene longitudinal stretching belt to pass through is formed between the two chain clips 2. A loading plate 3 having the same height as the clamping opening of the chain clip 2 is provided at the feeding end of the conveying channel 13. A flattening structure 4 for flattening the polytetrafluoroethylene longitudinal stretching belt placed on the loading plate 3 is provided on the frame 1.

[0034] Referring to Figure 1 and Figure 3 , in this embodiment, the material for transverse stretching is the polytetrafluoroethylene longitudinal stretching belt. In other embodiments, it can be other film materials or sheet materials that need to be transversely stretched. A transverse stretching box 14 is provided on the frame 1. After the material passes through the conveying channel 13, it enters the transverse stretching box 14 for heating and transverse stretching.

[0035] Referring to Figure 2 , Figure 3 and Figure 4The guide plate 11 is horizontally arranged on the frame 1 along the moving direction of the material. The feed end of the guide plate 11 is provided with a sprocket 15 driven by a driving member 12. The chain clip 2 is arranged in cooperation with the sprocket 15. Two vertical driving rods 16 are rotatably arranged on the frame 1. The bottom end of the driving rod 16 is transmission-connected with the driving member 12. In this embodiment, the driving member 12 is a motor. The output end of the motor is connected to the driving rod 16 and drives the driving rod 16 to rotate. The sprocket 15 is coaxially fixed on the driving rod 16. The two sprockets 15 are respectively located on both sides of the feeding end of the conveying channel 13. A shielding plate 161 located above the sprocket 15 is coaxially fixed to the top of the driving rod 16. The diameter of the shielding plate 161 is larger than the diameter of the sprocket 15 and is used to shield the sprocket 15.

[0036] Reference Figure 3 and Figure 4 The chain clip 2 includes a chain link 21 meshing with the sprocket 15 and a membrane clip 22 arranged on the chain link 21. The specific structure of the membrane clip 22 and the chain link 21 is basically consistent with the structure and principle in the prior art. The structure of the membrane clip 22 can refer to the Chinese utility model patent entitled "A chain clip" with authorization announcement number CN209440783U. The connection method of the membrane clip 22 and the chain link 21 can refer to the Chinese utility model patent entitled "A chain clip and a chain clip assembly" with authorization announcement number CN212684694U. It can also be any chain clip 2 with corresponding functions in the prior art, which will not be elaborated in this application; a plurality of rotating sprockets 15 (not shown in the figure) are arranged at intervals on the frame 1 to realize the movement and change of direction of the chain clip 2.

[0037] Reference Figure 1 , Figure 3 and Figure 4 The film clip 22 clamps the polytetrafluoroethylene longitudinal pull belt, the two driving members 12 are started to drive the two driving rods 16 to rotate relative to each other, the driving rod 16 rotates to drive the sprocket 15 to rotate, and at the same time the flattening structure 4 is started to flatten the wrinkled polytetrafluoroethylene longitudinal pull belt, the sprocket 15 rotates to drive the chain link 21 to move, thereby driving the film clip 22 to move, and the flattened polytetrafluoroethylene longitudinal pull belt moves along the conveying channel 13 under the clamping of the film clip 22, thereby realizing the flattening and conveying of the polytetrafluoroethylene longitudinal pull belt, so that the polytetrafluoroethylene longitudinal pull belt enters the horizontal pull box 14 smoothly for heating and horizontal pulling.

[0038] Reference Figure 1 , Figure 3 and Figure 5 A support plate 5 located above the sprocket 15 is fixedly provided on the frame 1. Two support plates 5 are provided and correspond one to one with the sprocket 15. The support plates 5 are fixedly provided on the frame 1 and located above the shielding plate 161. Two flattening structures 4 are provided and correspond one to one with the support plates 5. The flattening structures 4 are provided on the corresponding support plates 5.

[0039] Reference Figure 3 ,Figure 5 And Figure 6 , the following only takes a flattened structure 4 as an example for illustration. The flattened structure 4 includes a fixed seat 41, a blowing air pipe 42 and an air inlet pipe 43. Connecting plates 51 are provided on both supporting plates 5. The following takes one supporting plate 5 as an example for illustration. A plurality of vertically extending screw rods 52 are fixedly provided on the supporting plate 5. The connecting plate 51 is sleeved on the plurality of screw rods 52 and abuts against the supporting plate 5. A nut 53 is threadedly connected to the screw rod 52. During positioning, the nut 53 abuts tightly against the upper surface of the connecting plate 51.

[0040] Referring to Figure 3 , Figure 5 and Figure 6 , the fixed seat 41 is provided on the corresponding supporting plate 5. The lower surface of the fixed seat 41 has a concave installation groove (not shown in the figure). A magnet 411 is fixedly provided in the installation groove. The fixed seat 41 is adsorbed on the connecting plate 51 located on the corresponding supporting plate 5 through the magnet 411. The blowing air pipe 42 is provided on the corresponding fixed seat 41 and extends obliquely downward. The end of the blowing air pipe 42 away from the fixed seat 41 faces the polytetrafluoroethylene longitudinal drawing belt on the loading plate 3. The two blowing air pipes 42 face different sides of the polytetrafluoroethylene longitudinal drawing belt respectively. In this embodiment, the blowing air pipe 42 is a rubber pipe. The outlet end of the rubber pipe faces the edge of the wrinkled polytetrafluoroethylene longitudinal drawing belt. The orientation of the blowing air pipe 42 can be swung according to requirements to adapt to different wrinkled positions of the polytetrafluoroethylene longitudinal drawing belt.

[0041] Referring to Figure 3 , Figure 5 and Figure 6 , the inlet end of the air inlet pipe 43 is connected to an external air source, and the outlet end of the air inlet pipe 43 is connected to the blowing air pipe 42. In this embodiment, the air source is a blower (not shown in the figure). In other embodiments, a combination of a blower and a heater can be selected to pump gas with a certain temperature into the air inlet pipe 43 to adapt to different requirements.

[0042] Referring to Figure 3 , Figure 5 and Figure 6 , the upper surface of the loading plate 3 is flush with the clamping opening of the film clamp 22, and both side edges of the loading plate 3 have avoidance grooves 31 adapted to the edges of the film clamp 22. The loading plate 3 supports the polytetrafluoroethylene longitudinal drawing belt to reduce the probability of the polytetrafluoroethylene longitudinal drawing belt being concave and deformed under the action of wind force; a horizontally extending scale 54 is fixedly provided on one of the supporting plates 5, and the other end of the scale 54 is connected to the other supporting plate 5 to improve the convenience of moving and positioning the fixed seat 41 through the scale 54.

[0043] Referring to Figure 3 , Figure 5 and Figure 6, the gas enters the blowing pipe 42 after passing through the gas source and the air inlet pipe 43, and blows out from the blowing pipe 42. The gas blows towards the polytetrafluoroethylene longitudinal drawing belt located on the loading plate 3, so that the wrinkled polytetrafluoroethylene longitudinal drawing belt is blown flat. Then, under the action of the chain tongs 2 and the wind force, the wrinkled polytetrafluoroethylene longitudinal drawing belt moves smoothly, thereby improving the flatness of the polytetrafluoroethylene longitudinal drawing belt. The polytetrafluoroethylene longitudinal drawing belt enters the subsequent transverse drawing process step smoothly for heating and transverse drawing, so as to improve the convenience of the subsequent transverse drawing and the uniformity of stretching, thereby improving the stretching effect of the polytetrafluoroethylene film.

[0044] The working principle of the embodiment of the present application is as follows:

[0045] The chain tongs 2 clamp the polytetrafluoroethylene longitudinal drawing belt. The gas enters the blowing pipe 42 after passing through the gas source and the air inlet pipe 43, and blows out from the blowing pipe 42. The gas blows towards the polytetrafluoroethylene longitudinal drawing belt located on the loading plate 3, so that the wrinkled polytetrafluoroethylene longitudinal drawing belt becomes flat. As the chain tongs 2 move, the polytetrafluoroethylene longitudinal drawing belt moves smoothly under the action of the chain tongs 2, thereby improving the flatness of the polytetrafluoroethylene longitudinal drawing belt and reducing the probability of de-clamping. Moreover, the polytetrafluoroethylene longitudinal drawing belt enters the subsequent transverse drawing process step smoothly for heating and transverse drawing, improving the convenience of the subsequent transverse drawing and the uniformity of stretching, thereby improving the stretching effect of the polytetrafluoroethylene film.

[0046] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A polytetrafluoroethylene film horizontal pulling device, characterized in that: The invention comprises a frame (1), two guide plates (11) arranged opposite to each other on the frame (1), two groups of chain clips (2) respectively arranged around different guide plates (11), and a driving member (12) for driving the chain clips (2) to move around the guide plates (11) opposite to each other, a conveying channel (13) for a polytetrafluoroethylene film longitudinal drawing belt to pass through is formed between the two groups of the chain clips (2), a loading plate (3) having the same height as the clamping opening of the chain clips (2) is provided at the feeding end of the conveying channel (13), and a flattening structure (4) for flattening the polytetrafluoroethylene longitudinal drawing belt placed on the loading plate (3) is provided on the frame (1).

2. A polytetrafluoroethylene film horizontal pulling device according to claim 1, characterized in that: The feed end of the guide plate (11) is provided with a sprocket (15) driven by a driving member (12), the chain clip (2) is arranged in cooperation with the sprocket (15), and the two sprockets (15) are respectively located on both sides of the feed end of the conveying channel (13).

3. A polytetrafluoroethylene film horizontal pulling device according to claim 2, characterized in that: A support plate (5) located above the sprocket (15) is fixedly provided on the frame (1), and the flattening structure (4) is arranged on the support plate (5).

4. A polytetrafluoroethylene film horizontal pulling device according to claim 3, characterized in that: The flattened structure (4) comprises: A fixing seat (41), wherein the fixing seat (41) is arranged on the supporting plate (5); A blowing pipe (42), the blowing pipe (42) is arranged on the fixing seat (41) and extends obliquely downward, and one end of the blowing pipe (42) away from the fixing seat (41) faces the polytetrafluoroethylene longitudinal drawing belt located on the loading plate (3); An air inlet pipe (43), wherein the inlet end of the air inlet pipe (43) is connected to the air source and the outlet end of the air inlet pipe (43) is connected to the blowing pipe (42).

5. A polytetrafluoroethylene film horizontal pulling device according to claim 4, characterized in that: The support plates (5) are provided with two and correspond one to one with the sprockets (15); the fixed seats (41) are provided with two and correspond one to one with the support plates (5); the fixed seats (41) are arranged on the corresponding support plates (5); the blowing pipes (42) are provided with two and correspond one to one with the fixed seats (41); and the two blowing pipes (42) are respectively directed toward different sides of the polytetrafluoroethylene longitudinal pulling belt.

6. A polytetrafluoroethylene film horizontal pulling device according to claim 4, characterized in that: The fixing seat (41) is provided with a magnet (411), and the fixing seat (41) is adsorbed on the corresponding support plate (5) via the magnet (411).

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