Multi-roller system after cast film stripping and stripping chamber with multi-roller system

Abstract

The invention discloses a multi-roller system used after cast film stripping and a stripping chamber with the multi-roller system. The multi-roller system comprises a guide roller, a traction roller and a gravity roller which are arranged on a rack of the multi-roller system. The traction roller is located on the downstream side of the stripping roller, and one or more guide rollers are arranged between the traction roller and the stripping roller at intervals; the traction roller comprises two driving rollers which are arranged adjacently, and the film conveying path is of an S-shaped structure at the traction roller; the gravity roller is located on the downstream side of the traction roller, and the gravity roller and the gravity roller balance weight mechanism are arranged on the same closed chain or arranged on the two closed chains through a synchronous transmission mechanism respectively. According to the scheme, the problems that embossing is generated, the film thickness is affected and the like are avoided, constant tension is provided through gravity or other modes, tension adjustment is achieved, and micro longitudinal stretching is carried out; therefore, the film quality is improved. A negative pressure air curtain device is preferably arranged in the stripping chamber, so that the process environment control stability and the system safety are remarkably improved.

Description

Technical Field

[0001] The invention belongs to the technical field of film manufacturing equipment, and in particular relates to a multi-roller system after cast film stripping and a stripping chamber having the same. Background Art

[0002] At present, in a polyimide film casting production line, for example, a stripping roller is provided after the steel belt casting machine to strip the initially hardened film from the steel belt, and then the film is transported by a multi-roller system. At this time, the film is a wet film containing more solvents. During the transport process of the multi-roller system in the stripping chamber after stripping, the film is further hardened and the tension is adjusted. The existing multi-roller system, such as that disclosed in the Chinese utility model patent with the authorization announcement number CN217908659U, generally carries and transports the film through multiple rollers, but the conventional scheme is not perfect in considering the special case of wet film. For example, the conventional pressure roller structure will be used, which will cause certain deformation of the film surface and affect the quality of the film. Especially for high-end films, there are higher requirements for the surface quality and uniformity of the film, and the existing multi-roller system can hardly meet the use needs. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a multi-roller system after cast film peeling and a peeling chamber having the same, so as to solve the problem of poor film quality after treatment by the prior art solution, to achieve a more suitable conveying method for wet film through the improvement of the roller system, and to better make the surface quality and uniformity of the film meet the current high-end process requirements.

[0004] According to the technical scheme of the present invention, a multi-roller system after the cast film is peeled off includes a guide roller, a traction roller and a gravity roller arranged on a multi-roller system frame; the guide roller is a driven roller; the traction roller is located on the downstream side of the peeling roller, and one or more guide rollers are spaced between the traction roller and the peeling roller; the traction roller includes two adjacent active rollers, and the film conveying path is an S-shaped structure at the traction roller; the gravity roller is located on the downstream side of the traction roller, and one or more guide rollers are spaced between the gravity roller and the traction roller; the gravity roller is a driven roller, and the upstream and downstream sides of the gravity roller are adjacent to the guide roller, and the height position of the gravity roller is lower than the guide rollers on both sides thereof; the gravity roller and the gravity roller counterweight mechanism are arranged on the same closed chain or are respectively arranged on two closed chains through a synchronous transmission mechanism.

[0005] Furthermore, the closed chain includes a roller chain and a counterweight chain, and the gravity roller and the gravity roller counterweight mechanism are respectively arranged on the roller chain and the counterweight chain; the roller chain is in a vertically arranged ring shape, and the roller chain is drivingly connected to the roller sprockets located at its upper and lower ends; the roller chain is connected to a floating block, and the gravity roller is rotatably connected to the floating block; the synchronous transmission mechanism includes a gravity roller synchronous shaft, and the upper and / or lower roller sprockets are coaxially connected to the counterweight sprocket through the gravity roller synchronous shaft, and the counterweight sprocket is transmission-connected to the counterweight chain; the counterweight chain is in a vertically arranged ring shape, and the counterweight chain is connected to the gravity roller counterweight mechanism; the roller sprocket and the counterweight sprocket are both rotatably arranged on the frame.

[0006] Furthermore, it also includes two side pressing wheels, which are arranged at the two side edge positions of the multi-roller system, and the two side pressing wheels are located on the upper side and / or lower side of the film conveying path, and there is a gap between the two side pressing wheels and the film conveying path.

[0007] Furthermore, the two side pressing wheels form a group and are correspondingly located at the two side edges of the film; the side pressing wheels are multiple groups and are arranged along the film conveying path; the position of the side pressing wheels is located between two adjacent rollers in the multi-roller system.

[0008] Furthermore, the pressure wheels on both sides include a pressure wheel base, a pressure wheel track frame and a pressure wheel positioning part which are connected in sequence; a pressure wheel roller is rotatably connected to the pressure wheel positioning part; the pressure wheel track frame has a bar track, and the pressure wheel positioning part is adjustably arranged on the bar track through a track locking mechanism; the pressure wheel track frame is rotatably connected to the pressure wheel base at one end in the length direction of the bar track, and is provided with a shaft locking mechanism; the pressure wheel base is fixedly connected to the multi-roller system frame.

[0009] Furthermore, it also includes a flame retardant roller assembly, which includes a flame retardant pressure roller and a flame retardant guide roller. The flame retardant pressure roller is arranged on a balancing mechanism, and the flame retardant guide roller is one of the guide rollers. Under normal conditions, the flame retardant pressure roller and the flame retardant guide roller are in a non-closed state. Under a fire state, the balancing mechanism drives the flame retardant pressure roller and the flame retardant guide roller to close.

[0010] Furthermore, the balancing mechanism includes a group of swing arms, the flame retardant pressure roller is arranged between the group of swing arms, and a fixed rotating shaft and a balancing adjustment mechanism are also arranged on the swing arm. The flame retardant pressure roller is arranged on one side of the working position of the flame retardant guide roller through the fixed rotating shaft, and the closing and opening between the flame retardant pressure roller and the flame retardant guide roller are realized through the balancing adjustment mechanism.

[0011] Furthermore, at least three guide rollers are arranged between the traction roller and the stripping roller to form a cooling and conveying section.

[0012] According to the technical solution of the present invention, the present invention also provides a cast film stripping chamber, which is a sealed box structure with at least a film inlet, an outlet and a ventilation system, and has a multi-roller system after cast film stripping described in the present invention.

[0013] Furthermore, a negative pressure wind curtain device is arranged at the film entrance of the stripping chamber, and the negative pressure wind curtain device includes a first exhaust part and a second exhaust part which are arranged relatively to each other, and at least one flow equalizing plate is arranged in the first exhaust part and / or the second exhaust part, and the first exhaust part and the second exhaust part are respectively located on the upper and lower sides of the film conveying path, and a channel space for the film to pass through is formed between the first exhaust part and the second exhaust part, and the width of the channel space is adapted to the width of the film.

[0014] Compared with the prior art, the beneficial technical effects of the present invention are as follows: In the multi-roller system after the cast film of this scheme is peeled off, both traction rollers are active rollers, and the path of the film is S-shaped around the two traction rollers, which is used to increase the wrap angle and achieve the tension isolation effect; the existing scheme usually uses a pressure roller method to isolate the front and rear tensions during the film conveying process, but since the film here is a wet film containing more solvents, if the pressure roller method is used, it will produce embossing and affect the thickness of the film, so this special traction roller structure is designed; and, this scheme is provided with a gravity roller behind the traction roller, which provides constant tension through gravity or other means to achieve tension adjustment and micro-longitudinal stretching; thus improving the quality of the film. It is more preferred to also provide two side pressure wheels to assist in flattening the edge of the film and prevent the edge of the film from curling; and a flame retardant roller assembly, which gently presses on the film in a micro-pressure state, will not affect the surface flatness and thickness of the film, and can achieve a fire extinguishing effect when the film burns and catches fire. In addition, the stripping chamber of this scheme is also preferably provided with a negative pressure air curtain device, which can more effectively prevent the escape of solvent gas, significantly improving the process environment control stability and system safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of a multi-roller system provided by the present invention.

[0016] Figure 2 yes Figure 1 Schematic diagram of the left side view of the structure shown.

[0017] Figure 3 It is a schematic diagram of the three-dimensional structure of the two-side pressing wheel parts provided by the present invention.

[0018] Figure 4 It is a three-dimensional structural schematic diagram of a gravity roller assembly provided by the present invention.

[0019] Figure 5 yes Figure 4A schematic front view of a gravity roller assembly is shown.

[0020] Figure 6 yes Figure 4 A left side schematic view of the gravity roller assembly is shown.

[0021] Figure 7a , Figure 7b It is a force analysis principle diagram of two implementation modes of the gravity roller assembly.

[0022] Figure 8 It is a structural schematic diagram of a flame retardant roller assembly provided by the present invention.

[0023] Fig. 9 yes Figure 8 The cross-sectional structural schematic diagram of the part other than the guide roller in the flame retardant roller assembly is shown.

[0024] Fig.10 yes Fig. 9 A three-dimensional schematic diagram of the structure shown.

[0025] Fig.11 It is a partial cross-sectional schematic diagram of a roller fine-tuning device provided by the present invention.

[0026] Fig.12a yes Fig.11 Schematic diagram of the three-dimensional structure of the adjustment plate in the structure shown.

[0027] Figure 12b is with Fig.12a A schematic structural diagram of the adjustment plate on the opposite side of the adjustment plate shown.

[0028] Fig.13 yes Fig.11 A schematic diagram of a partial three-dimensional structure of the structure shown.

[0029] Fig.14 It is a schematic cross-sectional structural diagram of the stripping chamber provided by the present invention.

[0030] Fig.15 It is a schematic diagram of the three-dimensional structure of the stripping chamber provided by the present invention.

[0031] Fig.16 It is a structural schematic diagram of a negative pressure air curtain device provided by the present invention.

[0032] Fig.17 It is a schematic diagram of the three-dimensional structure of a negative pressure air curtain device provided by the present invention.

[0033] Fig.18 yes Fig.17 A rear view schematic diagram of the negative pressure air curtain device shown.

[0034] Fig.19 yes Fig.17The left side schematic diagram of the negative pressure air curtain device shown.

[0035] Description of reference numerals in the accompanying drawings: 1. Guide roller; 2. Traction roller; 3. Gravity roller; 31. Gravity roller slide rail; 32. Roller sprocket; 33. Roller chain; 34. Floating block; 35. Gravity roller synchronous shaft; 36. Counterweight sprocket; 37. Counterweight chain; 38. Gravity roller counterweight mechanism; 39. Wire encoder; 4. Pressing wheels on both sides; 41. Pressing wheel base; 42. Pressing wheel track frame; 43. Pressing wheel positioning part; 5. Flame retardant roller assembly; 51. Flame retardant pressure roller; 52. Flame retardant guide roller; 53. Balancing mechanism; 54. Pressure roller fine-tuning device; 55. Ejector rod kit; 56. Pressure roller ejector; 57. Angle fine-tuning strip hole; 58. Angle fine-tuning screw rod; 59. Adjustment plate; 510. Strip limiting groove; 511. Auxiliary positioning strip hole; 512. Through hole; 513. Pin shaft; 514. Position fine-tuning screw rod; 515. Swing arm; 516. Bearing seat; 517. Fixed rotating shaft; 518. Balance adjustment mechanism; 519. Balance counterweight; 520. Counterweight adjustment bolt; 521. Fixed limiting rod; 522. Longitudinal limiting groove; 6. Peeling roller; 7. Negative pressure air curtain device; 71. First exhaust part; 72. Second exhaust part; 73. Flow equalizing plate; 74. Channel space; 75. Channel side plate; 76. Slit baffle; 77. First airtight bellows; 78. Second airtight bellows; 79. First exhaust duct; 710. Second exhaust duct; 711. Wind speed collecting device; 712. Wind speed regulating mechanism. DETAILED DESCRIPTION

[0036] The present invention provides a multi-roller system after cast film stripping and a stripping chamber having the same, which solves the problem of poor film quality after treatment in the prior art solution, and achieves a more suitable conveying method for wet film through the improvement of the roller system, so that the surface quality and uniformity of the film can better meet the current high-end process requirements.

[0037] See also Figure 1 A multi-roller system after stripping of a cast film according to an embodiment of the present invention comprises a guide roller 1, a traction roller 2 and a gravity roller 3 arranged on a multi-roller system frame. Figure 2 As shown, usually, each roller is horizontally arranged and has a relatively long length to match the width of the film, and then both ends of each roller in the length direction are directly or indirectly connected to the multi-roller system frame to ensure stability, and the axis position of the roller is fixed or floating, and the roller can rotate around its axis. The basic structure of the roller and the frame is the prior art and will not be described in detail here.

[0038] The guide roller 1 is a driven roller, which is fixedly arranged on the frame of the multi-roller system, and is usually a plurality of rollers distributed from the input end to the output end. The film is provided with traction by the active roller in the multi-roller system. The film is attached to the guide roller 1, and the guide roller 1 can be driven by the film to rotate passively, so as to transport the film along the set path. More specifically, the two ends of the guide roller 1 are connected to the frame through the guide roller fine-tuning mechanism, so that the two ends of the guide roller 1 can be adjusted to be flush and the rollers can be parallel.

[0039] The traction roller 2 is located at the downstream side of the stripping roller 6, and there are one or more ( Figure 1 There are six guide rollers 1 in the row. The pulling roller 2 includes two adjacent active rollers, and the film conveying path is an S-shaped structure at the pulling roller 2. For example, of the two active rollers of the pulling roller 2, the roller on the upstream side is located obliquely above the roller on the downstream side, so that the S-shaped film at the pulling roller 2 in the middle of a row of guide rollers 1 has a larger wrap angle; in addition, the two pulling rollers 2 are both active rollers, so the tension isolation effect is achieved, that is, the tension conditions on the upstream and downstream sides of the pulling roller 2 are independent. Figure 1 In the structure shown, the peeling roller 6 and the traction roller 2 are active rollers, and the rest are driven rollers ( Figure 1 The exception is the leftmost active drum of the steel belt casting machine, which is not included in the multi-roll system).

[0040] It should be noted that in the existing multi-roller system, a pulling roller and a pressure roller are generally used to achieve the tension isolation effect. However, for the cast film stripping chamber, the film here is a wet film containing more solvent. If a pressure roller method is used, embossing will be produced, affecting the thickness of the film, etc. The special pulling roller structure designed by the present invention can avoid the problem of compression deformation.

[0041] In some embodiments, at least three (e.g., four to six) guide rollers 1 are arranged between the traction roller 2 and the stripping roller 6 to form a cooling conveying section. The cooling conveying section is formed by these guide rollers 1 to a set length, and its function is to reduce the temperature of the film to, for example, 30°C to 40°C after being conveyed; the setting of the guide rollers 1 must also ensure the angle of the wrap angle, for example, about 30°. According to the angle requirements, the setting method, number and spacing of the guide rollers 1 are obtained. More specifically, the stripping chamber (especially above the cooling conveying section) is provided with an air supply mechanism to supply clean air, such as room temperature, into the stripping chamber to keep the cooling conveying section at the required low temperature.

[0042] The gravity roller 3 is located at the downstream side of the traction roller 2, and there are one or more ( Figure 1The gravity roller 3 is a driven roller, and the upstream and downstream sides of the gravity roller 3 are adjacent to a guide roller 1. The height of the gravity roller 3 is lower than the guide rollers 1 on both sides thereof, and the position of the gravity roller 3 is movable. The function of the gravity roller 3 is to adjust the tension and to perform micro-longitudinal stretching. The main principle is to provide constant tension through gravity or other means; in the case where the gravity roller 3 is vertically movable, the gravity roller 3 pulls and stretches the film downward with constant tension; and the constant tension is adjustable.

[0043] See also Figures 4 to 6 The gravity roller assembly includes a gravity roller 3 and a gravity roller counterweight mechanism. The gravity roller 3 and the gravity roller counterweight mechanism 38 are arranged on the same closed chain, or are respectively arranged on two closed chains through a synchronous transmission mechanism (in other words, the gravity roller 3 and the gravity roller counterweight mechanism 38 are arranged on different closed chains, with a larger spacing in space, while still having a synchronous transmission relationship for action). The closed chain is an annular chain that can transmit and rotate on the annular path. The closed chain forms a structure similar to a fixed pulley (or a lever structure). Furthermore, the gravity roller 3 and the gravity roller counterweight mechanism 38 are located on the same side or on the opposite side of the fulcrum of the lever structure.

[0044] like Figure 7a As shown, when the gravity roller 3 and the gravity roller counterweight mechanism 38 are respectively located on the upstream and downstream sides of the closed chain, the sum of the film tension F and the counterweight tension G1 of the gravity roller counterweight mechanism is balanced with the gravity G2 of the gravity roller, that is, the system resultant force = F + G1 - G2 = 0, so F = G2 - G1.

[0045] like Figure 7b As shown, when the gravity roller 3 and the gravity roller counterweight mechanism 38 are located on the same side of the closed chain, the sum of the counterweight tension G1 and the gravity roller gravity G2 is balanced with the film tension F, that is, the system force = F-G1-G2=0, so F=G1+G2.

[0046] In some embodiments, the gravity roller 3 and the gravity roller counterweight mechanism 38 are arranged on the same closed chain; the closed chain is in a vertically arranged ring shape, and the closed chain transmission is connected to the sprockets located at its upper and lower ends; the closed chain is connected to the floating block 34 and the gravity roller counterweight mechanism, and the gravity roller 3 is rotatably connected to the floating block 34.

[0047] In other preferred embodiments, the closed chain includes a roller chain 33 and a counterweight chain 37, and the gravity roller 3 and the gravity roller counterweight mechanism 38 are respectively arranged on the roller chain 33 and the counterweight chain 37. The roller chain 33 is in a vertically arranged ring shape, and the roller chain 33 is connected to the roller sprocket 32 ​​located at the upper and lower ends thereof by transmission. The roller chain 33 is connected with a floating block 34, and the gravity roller 3 is rotatably connected to the floating block 34. The synchronous transmission mechanism includes a gravity roller synchronous shaft 35, and the upper and / or lower roller sprockets 32 are coaxially connected with the counterweight sprocket 36 through the gravity roller synchronous shaft 35, and the counterweight chain 37 is connected to the counterweight sprocket 36 by transmission. The counterweight chain 37 is in a vertically arranged ring shape, and the counterweight chain 37 is connected with the gravity roller counterweight mechanism 38.

[0048] Preferably, it also includes a gravity roller slide rail 31 vertically arranged on the frame, and the floating block 34 is slidably connected to the gravity roller slide rail 31 to match and limit the gravity roller 3 so that it can only move up and down, and ensure smooth up and down movement. It can be understood that for the scheme where the gravity roller 3 and the gravity roller counterweight mechanism 38 are arranged in the same closed chain or different closed chains, the gravity roller slide rail 31 can be used for auxiliary limiting.

[0049] Specifically in the illustrated embodiment, the gravity roller slide 31 is arranged on the frame of the multi-roller system, and upper and lower roller sprockets 32 are respectively arranged at (near) the upper and lower ends of the gravity roller slide 31 and are connected to a roller chain 33. The roller chain 33 is annular and has a floating block 34 on a straight line segment on one side. The floating block 34 is rotatably connected to the gravity roller 3, for example, through a bearing seat, so that the gravity roller 3 can rotate around its own central axis, and the central axis position can move up and down together with the floating block 34.

[0050] Preferably, only the upper roller sprocket 32 ​​is coaxially connected to the counterweight sprocket 36 through the gravity roller synchronous shaft 35, and the counterweight sprocket 36 is preferably distributed up and down and corresponds to two (a group), wherein the upper counterweight sprocket corresponds to the position of the upper roller sprocket and is coaxially connected through the gravity roller synchronous shaft 35, and the lower counterweight sprocket corresponds to the position of the lower roller sprocket. The gravity roller synchronous shaft 35 is located at the top to better play the role of the fixed pulley, and the shape and position of the roller chain 33 and the counterweight chain 37 correspond to each other, which helps to make the synchronous transmission more stable. In other embodiments, there are gravity roller synchronous shafts 35 at both the top and the bottom.

[0051] In this embodiment, the gravity roller counterweight mechanism 38 and the floating block 34 are located on different sides of the ring of the counterweight chain 37 and the roller chain 33. The "different sides" refer to the two straight line segments (i.e., the relative "upward side" and "downward side") in the ring chain structure. Figure 6As shown; because the longitudinal stretching tension required for the film is usually not large, the gravity of the gravity roller 3 can be "reduced" by the gravity roller counterweight mechanism 38 to achieve the desired constant tension effect; of course, for example, for situations where a larger tension is required, it can be considered to set the gravity roller counterweight mechanism 38 on the same side of the floating block 34 and the gravity roller 3.

[0052] More specifically, since the roller length of the gravity roller 3 is greater than the film width and is usually longer, the two ends of the gravity roller 3 in the length direction are respectively connected to two floating blocks 34; and in the length direction of the gravity roller 3, relative to the midpoint of the length of the gravity roller 3, the gravity roller assembly has a mirror-symmetrical structure. Among them, the mirror-symmetrical structure includes that the floating blocks 34 and the gravity roller counterweight mechanism 38 in the structures on both sides are consistent (including, for example, consistent mass, symmetrical position, etc.). In other words, the same and symmetrical structure is adopted for the two ends of the gravity roller 3, so that the two ends of the gravity roller 3 are subjected to the same force and are flush in position, so that the film can be stretched uniformly. Further preferably, the roller sprockets 32 on both sides (upper) and the counterweight sprockets 36 (a total of four sprockets) are coaxially connected through a gravity roller synchronous shaft 35, and the structure is more stable and simple.

[0053] Preferably, the weight chain 37 and the weight sprocket 36 are located outside the roller chain 33 and the roller sprocket 32. In a specific application, the gravity roller 3 is located in the film conveying area (such as a closed peeling chamber). Such an arrangement allows the gravity roller weight mechanism 38 to be located outside the side wall of the peeling chamber, forming an operating space, which is convenient for the staff to adjust the gravity roller weight mechanism 38.

[0054] In some embodiments, the gravity roller counterweight mechanism 38 is, for example, a weight such as a weight, and the gravity applied by the gravity roller counterweight mechanism 38 can be changed by replacing weights of different masses. In a preferred embodiment, the gravity roller counterweight mechanism 38 has a detachable gravity roller counterweight, which is, for example, a weight (weight), and can be installed / removed thereon as needed to adjust the mass; or other replaceable / adjustable counterweight methods are used. For example, the gravity roller counterweight mechanism 37 includes a horizontally arranged weight-adding support (such as a round tray), a vertical connecting rod is fixedly connected to the middle of the weight-adding support, the lower part of the weight-adding support and the upper part of the connecting rod are respectively connected to the counterweight chain 37 to form a ring, and a weight-adding weight is detachably placed on the weight-adding support, one side of the weight-adding weight has an opening and the connecting rod is located in the opening of the weight-adding weight; the weight-adding weight is, for example, a number of standard parts in the shape of discs / round cakes, so as to adjust the total mass of the gravity roller counterweight mechanism 38 by increasing or decreasing. Furthermore, a positioning nut is also threadedly sleeved on the upper end of the connecting rod, and the positioning nut can tighten and press the weight-adding weight below to prevent the weight-adding weight from falling out.

[0055] The working principle of the gravity roller assembly of this scheme is as follows. The roller sprocket 32 ​​and the counterweight sprocket 36 can only rotate synchronously. When the gravity roller counterweight mechanism 38 moves downward, the gravity roller 3 moves upward. The initial weight of the gravity roller is fixed. In the initial state, the roller is at the lower end. After the film is pulled, under the action of tension, the roller moves upward, and the gravity roller counterweight mechanism 38 moves downward. Then, as Figure 7a And the above-mentioned force analysis can be adjusted to the required force balance state.

[0056] It is conceivable that the gravity roller counterweight mechanism is not limited to this. For example, in other embodiments, the gravity roller counterweight mechanism can also be selected as a hydraulic cylinder or a pneumatic cylinder, which is equivalent to replacing the gravity of the gravity roller counterweight mechanism 38 in the aforementioned embodiment with the force output by the hydraulic cylinder or the pneumatic cylinder.

[0057] Preferably, a displacement detection device is also included, and the gravity roller or the gravity roller counterweight mechanism or the synchronous transmission mechanism is provided with the displacement detection device; for example, the displacement detection device is located in the gravity roller assembly or on the downstream side of the gravity roller assembly. The displacement detection device is used to notify the system to adjust the rotation speed of the traction roller assembly after detecting the displacement change, so as to achieve timely feedback or automatic adjustment of the system to ensure the required tension effect. The displacement detection mechanism is, for example, a wire encoder 39 or a displacement sensor, and the displacement detection mechanism can directly or indirectly detect the displacement of the gravity roller 3. For example Figure 7a In the ideal working state shown in the figure and with balanced forces, the position of the gravity roller 3 is basically stationary; however, in actual production applications, there may be a sudden change in tension, such as uneven film thickness, which causes the film thickness under the gravity roller 3 to change. The constant force applied to films of different thicknesses results in different amounts of stretching, which is reflected in the up and down floating of the position of the gravity roller 3. The displacement detection mechanism monitors the distance of the up and down floating offset to understand the process conditions, and can further realize manual adjustment or automatic adjustment of the gravity roller counterweight mechanism 38 based on this.

[0058] More specifically, taking the wire encoder 39 as an example, the main part of the wire encoder 39 is fixedly arranged on the frame, and the wire end of the wire encoder 39 is connected to the gravity roller counterweight mechanism 38, so as to measure the distance that the gravity roller counterweight mechanism 38 moves up and down; if the film is thick or the tension is too large, the downward force provided by the gravity roller counterweight mechanism 38 is increased to control the distance it moves upward; on the contrary, if the tension is too small, the downward force provided by the gravity roller counterweight mechanism 38 is reduced. The most ideal state is that the roller is in the middle position, and the wire encoder 39 measures the distance, the goal is to adjust the tension and conveying speed behind the traction roller assembly. It can be understood that in other embodiments, the displacement detection device can also be selected as a speed measuring device for measuring the film speed, etc., which can indirectly reflect the displacement situation.

[0059] See also Figures 1 to 3 , preferably also includes two side pressing wheels 4, which are smaller rollers and play a role in assisting the flattening of the film edges to prevent the film edges from curling up. The two side pressing wheels 4 are arranged at the two side edge positions of the multi-roller system. In other words, they are arranged on the multi-roller system frame and are located at the two ends of the length direction of other rollers, corresponding to the edges of the film in the width direction. The two side pressing wheels 4 are located beside the film conveying path, the two side pressing wheels 4 are located on the upper side and / or the lower side of the film conveying path, and there is a gap between the two side pressing wheels 4 and the film conveying path (not in contact with the ideal film conveying path). Unlike other rollers, the length of the two side pressing wheels 4 is shorter, does not extend from the left frame to the right frame, is not greater than the film width, but is only arranged on both sides of the film. More specifically, it is preferred that the left and right side pressing wheels 4 are a group, correspondingly located at the two side edges of the film; the two side pressing wheels 4 are multiple groups, arranged along the film conveying path; the position of the two side pressing wheels 4 is located between two adjacent rollers in the multi-roller system. The positions of the two side pressure wheels 4 can be selected to be set between rollers that are far apart in the roller assembly, for example, between two adjacent guide rollers 1, between the traction roller 2 and the adjacent guide roller 1, between the gravity roller 3 and the adjacent guide roller 1, etc. The specific positions can be configured as needed. The two side pressure wheels 4 do not change the film conveying path, do not exert pressure on the film, are only set on the side of the film conveying path, do not have a driving component, and are driven rollers. When the edge of the film is warped, the two side pressure wheels 4 can press the warped part to help restore the film to the ideal position, and avoid the film edge from being warped too much and folding or curling and wrinkling.

[0060] Preferably, the two side pressing wheels 4 are arranged on the multi-roller system frame in an adjustable position. For example, the two side pressing wheels 4 include a pressing wheel base 41, a pressing wheel track frame 42 and a pressing wheel positioning part 43 which are connected in sequence. The pressing wheel positioning part 43 is rotatably connected with a pressing wheel roller (i.e., the two side pressing wheels 4 bodies) through, for example, a bearing. The pressing wheel track frame 42 has a bar track, and the pressing wheel positioning part 43 is adjustably arranged on the bar track through a track locking mechanism. The pressing wheel track frame 42 is rotatably connected to the pressing wheel base 41 at one end in the length direction of the bar track, for example, by being sleeved on a fixed shaft, and is provided with a rotating shaft locking mechanism. The pressing wheel base 41 is fixedly connected to the multi-roller system frame. Thus, the pressing wheel track frame 42 can be rotated to adjust the angle, and the two side pressing wheels 4 bodies can be adjusted in the length direction of the pressing wheel track frame 42. In this way, the setting of the adjustable position of the two side pressing wheels 4 is realized, which is more flexible in application, reduces the accuracy requirements for the installation holes on the frame, and is easier to be applied in practice. More specifically, the track locking mechanism is, for example, a rotatable nut member, and the end of the pressure wheel positioning part 43 is a bolt section with a diameter smaller than the rest of the part. The bolt section is inserted into the bar track (hole) on the pressure wheel track frame 42, and then the nut member is installed at the end of the bolt section to clamp and position the pressure wheel positioning part 43. The shaft locking mechanism is, for example, a top screw, or a damping structure. It is understandable that there are many ways to adjust the position, especially for the pressure wheels 4 on both sides that are not subjected to large forces; the present invention is not limited to the above-mentioned specific embodiments. Optionally, the remaining rollers are also installed in a position-adjustable manner. Optionally, the pressure wheels 4 on both sides are located above or below the film conveying path, or as Figure 3 As shown, two pinch rollers are mounted on the same pinch track frame 42 and are located at the upper and lower sides of the film conveying path.

[0061] See also Figure 1 , Figures 8 to 13 , and also includes a flame retardant roller assembly 5. Preferably, the flame retardant roller assembly 5 is located on the downstream side of the gravity roller assembly. The flame retardant roller assembly 5 includes a flame retardant pressure roller 51 and a flame retardant guide roller 52, the film being transported is located on the flame retardant guide roller 52, and the flame retardant pressure roller 51 is arranged on a balancing mechanism 53. Generally, the flame retardant guide roller 52 and the flame retardant pressure roller 51 are both driven rollers, which are not actively driven to rotate by a motor, but passively rotate under the action of friction as the film is transported. The flame retardant guide roller 52 is one of the guide rollers 1. The flame retardant pressure roller 51 and the flame retardant guide roller 52 are adjacent, for example Figure 1In the illustrated embodiment, the flame retardant pressure roller 51 is adjacently located above the flame retardant guide roller 52. Under normal conditions, the flame retardant pressure roller 51 and the flame retardant guide roller 52 are in a non-closed state (or an open state), and the flame retardant pressure roller 51 does not contact the film; under a fire condition, the balancing mechanism 53 drives the flame retardant pressure roller 51 and the flame retardant guide roller 52 to close, and the side of the film facing away from the flame retardant guide roller 52 contacts the flame retardant pressure roller 51 (the side of the film facing the flame retardant guide roller 52 contacts the flame retardant guide roller 52). Of course, the outer surfaces of the flame retardant pressure roller 51 and the flame retardant guide roller 52 are flame retardant materials, such as existing flame retardant rubber rollers, so that when a fire occurs, the film will be sandwiched between the flame retardant pressure roller 51 and the flame retardant guide roller 52, and the fire can be extinguished by the flame retardant pressure roller 51.

[0062] In this solution, at least one guide roller in the multi-roller system is used as a flame-retardant guide roller 52, and a flame-retardant pressure roller 51 is arranged thereon. The film will be in relatively tight contact with the flame-retardant guide roller 52 to achieve transmission and delivery, while the flame-retardant pressure roller 51 does not affect the delivery and is only an additional component for achieving fire extinguishing. This solution is particularly suitable for, for example, a stripping chamber of a polyimide film, where the film is a wet film containing a large amount of solvent. The solvent evaporated from the film forms a flammable gas, which may catch fire on the surface of the film in a high temperature environment; the flame-retardant roller assembly of this solution is preferably arranged on the downstream side of the multi-roller system in the stripping chamber, for example, because the process temperature of the chamber connected downstream of the stripping chamber is usually higher. Optionally, under the fire state, under the action of the balancing mechanism 53, the film and the flame-retardant pressure roller 51 are in almost pressure-free contact. In other words, the flame-retardant pressure roller 51 is close to a balanced state at the position where it just contacts the film, so that the softer film (such as a wet film) will not be deformed due to pressure.

[0063] The flame-retardant pressure roller 51 has a flame-retardant roller center axis and a flame-retardant roller cylinder. The flame-retardant roller cylinder is rotatably mounted on the flame-retardant roller center axis (for example, through bearings), and the two ends of the flame-retardant roller center axis are fixedly connected to the two balancing mechanisms 53 on both sides; or, the flame-retardant roller cylinder is fixedly connected to the flame-retardant roller center axis, and the two ends of the flame-retardant roller center axis are rotatably connected to the two balancing mechanisms 53 on both sides through, for example, bearings; in this way, the outer side of the flame-retardant pressure roller 51 that contacts the film can rotate. In addition, the flame-retardant pressure roller 51 is longer to adapt to a wider film, and positioning at both ends of the roller can ensure the stability of the roller. Similarly, the flame-retardant guide roller 52 has a flame-retardant guide roller center axis and a flame-retardant guide roller cylinder; the flame-retardant guide roller cylinder is rotatably mounted on the flame-retardant guide roller center axis, and the two ends of the flame-retardant guide roller center axis are connected to the two sides of the frame; or, the flame-retardant guide roller cylinder is fixedly connected to the flame-retardant guide roller center axis, and the two ends of the flame-retardant guide roller center axis are rotatably connected to the two sides of the frame.

[0064] In a preferred embodiment, the balancing mechanism 53 includes a group of swing arms 515, and the flame-retardant pressure roller 51 is rotatably arranged between the group of swing arms 515, specifically, the two ends of the flame-retardant pressure roller 51 are respectively connected to the two swing arms 515 through, for example, a bearing seat. A fixed rotating shaft 517 and a balancing adjustment mechanism 518 are also provided on the swing arm 515. The flame-retardant pressure roller 51 is arranged on one side of the working position of the flame-retardant guide roller 52 through the fixed rotating shaft 517. The working position is the working position where the flame-retardant pressure roller 51 and the flame-retardant guide roller 52 cooperate; or more specifically, the fixed rotating shaft 517 is rotatably connected to the frame so that the flame-retardant pressure roller 51 is adjacent to the flame-retardant guide roller 52, for example, the flame-retardant pressure roller 51 is located above or obliquely above the flame-retardant guide roller 52. The balancing adjustment mechanism 518 is used to control the angle state of the swing arm 515, that is, the closing and opening between the flame-retardant pressure roller 51 and the flame-retardant guide roller 52 can be achieved through the balancing adjustment mechanism 518.

[0065] More specifically, the set of swing arms 515 is provided with a pressure roller fine-tuning device 54. On each swing arm 515, the pressure roller fine-tuning device 54 includes a push rod set 55 and a pressure roller push rod 56 which are fixedly connected to each other. The push rod set 55 is, for example, an annular sleeve structure, which is sleeved on the fixed rotating shaft 517. The push rod set 55 is keyed to the fixed rotating shaft 517 (for example, Fig. 9 In the figure, both the push rod assembly 55 and the fixed shaft 517 have keyways, and the structure shown by the black square is a key, more specifically, a flat key), so that the angular positions of the push rod assembly 55 and the fixed shaft 517 are relatively fixed.

[0066] One of the push rod set 55 and the swing arm 515 is provided with one or more angle fine-tuning strip holes 57, and the other is provided with a bolt fixing hole corresponding to the angle fine-tuning strip hole 57 (or provided with a bolt in other ways), and a fine-tuning positioning bolt is connected to the bolt fixing hole, and the fine-tuning positioning bolt is inserted into the angle fine-tuning strip hole 57. The angle fine-tuning strip hole 57 is, for example, three or four strip holes (more specifically, arc-shaped strip holes extending along the circumferential direction) uniformly arranged around the fixed rotating shaft 517. The fine-tuning positioning bolt (in the untightened state) can move in the angle fine-tuning strip hole 57, so that the swing arm 515 and the push rod set 55 are rotatably connected through the fine-tuning positioning bolt and the angle fine-tuning strip hole 57 (in the equipment maintenance and commissioning stage); after determining the position, the fine-tuning positioning bolt can be tightened to ensure a stable connection.

[0067] The roller push rod 56 is extended along the length direction of the swing arm 515, roughly parallel to the swing arm 515, and is set at the longitudinal center of the swing arm 515. The upper and lower sides of the roller push rod 56 in the length direction are respectively threaded with angle fine-tuning screws 58, which can be fixed on the swing arm 515 to fine-tune and tighten the roller push rod 56. During the adjustment process, one end is fixed and the other end is adjusted, thereby driving the swing arm 515 to rotate, so as to adjust the gap of the flame-retardant roller 51, in other words, to adjust the relative angle position of the flame-retardant roller 51 with the fixed rotating shaft 517 as the center. Specifically, the upper and lower angle fine-tuning screw rods 58 abut against and clamp the pressure roller top rod 56. For example, if the upper angle fine-tuning screw rod 58 is screwed downward for a certain distance and the lower angle fine-tuning screw rod 58 is screwed downward for a certain distance, the angle between the relatively floating swing arm 515 and a series of fixed components including the pressure roller top rod 56, the top rod kit 55 and the fixed shaft 517 will change accordingly.

[0068] Please also see Fig.10 For the overall structure, under ideal conditions, the quadrilateral formed by the fixed shaft 517, the flame-retardant pressure roller 51 and the two swing arms 515 is located in a plane. By adjusting the above-mentioned angles of the swing arms 515 at both ends of the flame-retardant pressure roller 51 in the length direction, the torsion of the quadrilateral can be adjusted; furthermore, since the fixed shaft 517 is connected to the fixed frame, the above-mentioned torsion will be reflected in whether the two ends of the flame-retardant pressure roller 51 in the length direction are level. During the equipment maintenance and commissioning stage, this solution adjusts the two ends of the flame-retardant pressure roller 51 by adjusting the angle fine-tuning screw 58, so that the flame-retardant pressure roller 51 and the flame-retardant guide roller 52 are parallel, that is, the gap width between the flame-retardant pressure roller 51 and the flame-retardant guide roller 52 is uniform, to avoid the situation where one end of the flame-retardant pressure roller 51 contacts the film while the other end does not.

[0069] See also Figures 11 to 13 In other embodiments, the roller fine-tuning device directly adjusts the positioning positions of the two ends of the flame-retardant roller 51, and the roller fine-tuning device includes an adjustment plate 59. The two ends of the flame-retardant roller 51 are respectively connected to two swing arms 515, and the two swing arms 515 are connected to the adjustment plate 59. The adjustment plate 59 is located on the opposite side of the two swing arms 515, and the swing arms 515 and the adjustment plate 59 are adjustable and fixedly connected; the adjustment plate 59 is fixedly connected to the bearing seat 516, and is rotatably connected to the two ends of the flame-retardant roller 51 through the bearing seat 516.

[0070] An example of a specific structure of an adjustable fixed connection is that a strip-shaped limit groove 510 is provided on the adjustment plate 59, and an auxiliary positioning strip-shaped hole 511 is provided around the strip-shaped limit groove 510, and a through hole 512 is provided, and the through hole 512 passes through the adjustment plate and the strip-shaped limit groove 510. The length directions of the strip-shaped limit groove 510, the auxiliary positioning strip-shaped hole 511, and the through hole 512 on an adjustment plate 59 are parallel. The adjustment plate includes a first adjustment plate connected to a swing arm 515 on one side and a second adjustment plate connected to a swing arm 515 on the other side. The strip-shaped limit groove 510 on the first adjustment plate is perpendicular to the length direction of the strip-shaped limit groove 510 on the second adjustment plate; for example Fig.11 In the embodiment shown, the adjustment plate on the left ( Fig.12a The length direction of each slot and hole on the right side is longitudinal (vertical), and the adjustment plate on the right side ( Figure 12b The length direction of each slot and hole is horizontal.

[0071] A pin 513 is fixedly disposed on the swing arm 515. The pin 513 protrudes toward the opposite sides of the two swing arms 515. The pin 513 penetrates into the strip-shaped limiting groove 510 and can slide in the strip-shaped limiting groove 510. The through hole 512 has an internal thread. The two ends of the through hole 512 on the outer side (for example Fig.13 The upper and lower ends of the upper and lower ends of the upper and lower ends of the lower and upper ...

[0072] It is understandable that in other embodiments, the two ends of the flame retardant pressure roller 51 may also be connected to the two swing arms 515 through a bearing seat. The two pressure roller fine-tuning devices mentioned above may be provided at the same time, or only one of them may be provided; or, the pressure roller fine-tuning device may not be provided, and accordingly, the fine-tuning function is not provided.

[0073] In a preferred embodiment, the balance adjustment mechanism 518 is self-gravity adjustment, including a balance counterweight 519 slidably connected to the swing arm 515, and can drive the balance counterweight 519 to move to the side of the fixed shaft 517 through a counterweight driving device, so as to adjust the center of gravity of the swing arm 515 and drive the flame retardant pressure roller 51 and the flame retardant guide roller 52 to close. More specifically, the flame retardant pressure roller 51 and the balance counterweight 519 are respectively arranged at the two ends of the swing arm 515 (the two sides of the fixed shaft 517), for example, the fixed shaft 517 is located in the middle of the swing arm 515, the flame retardant pressure roller 51 is located on one side of the fixed shaft 517, and the balance counterweight 519 is located on the other side of the fixed shaft 517, and the fixed shaft 517 is connected to the frame, and the closing and opening between the flame retardant pressure roller 51 and the flame retardant guide roller 52 are achieved by adjusting the balance counterweight 519.

[0074] For a common structure in which the flame-retardant pressure roller 51 is relatively long, a balancing mechanism 53 is provided at both ends, and the balancing weight 519 and the fixed rotating shaft 517 are preferably rod-shaped, arranged in parallel with the flame-retardant pressure roller 51, and connected to the swing arms 515 on both sides, so that the overall structure is more stable, and the state of the flame-retardant pressure roller 51 is ensured to be, for example, horizontal, and will not accidentally tilt or shake due to uneven force on both ends. Of course, the balancing weight 519 and / or the fixed rotating shaft 517 can also be optionally provided separately on each swing arm 515. Preferably, in the balanced state, the height of the flame-retardant pressure roller 51 is lower than the balancing weight 519, and the swing arm 515 has one end of the flame-retardant pressure roller 51 in a state of being slightly tilted downward, which can better keep the flame-retardant pressure roller 51 in the balanced position and achieve the effect of gently pressing the film.

[0075] Preferably, the balancing weight 519, the fixed rotating shaft 517 and / or the flame-retardant pressure roller 51 are connected to the swing arm 515 in an adjustable position, so as to facilitate flexible adjustment of the balance state of the flame-retardant pressure roller 51 according to actual conditions.

[0076] The preferred solution of the balancing weight 519 being adjustable (i.e., the balancing weight 519 is driven by the balancing weight driving device) is, for example, a sliding groove extending toward one side of the fixed rotating shaft 517 is provided at one end of the swing arm 515, the balancing weight 519 is slidably connected in the sliding groove, the balancing weight driving device is a balancing weight adjusting bolt 520, the balancing weight 519 has threaded holes (at both ends), the balancing weight adjusting bolt 520 is threadedly connected to the balancing weight 519, and the balancing weight adjusting bolt 520 is rotatably connected to the swing arm 515. The slidable direction of the balancing weight 519 matches the length direction of the balancing weight adjusting bolt 520, both of which are the direction approaching from the end to the middle of the swing arm 515. During adjustment, the balancing weight adjusting bolt 520 rotates in situ, and due to the cooperation of the thread and the sliding limit, the balancing weight 519 can move along the sliding groove, thereby adjusting the torque on the balancing weight side; for example, the balancing weight 519 is moved from the end to the middle to change the flame retardant pressure roller 51 from the open state to the closed state. Alternatively, as an optional alternative, the counterweight adjustment bolt 520 is rotatably connected to the balancing counterweight 519, and the counterweight adjustment bolt 520 is threadedly connected to the swing arm 515, which can also achieve similar technical effects. Further optionally, the counterweight adjustment bolt 520 is connected to an electric drive device to control its rotation, so that line control, remote control, or automatic control can be achieved.

[0077] It is understandable that the balance adjustment mechanism 518 is not limited to the above embodiments. For example, in some embodiments, the balance adjustment mechanism 518 is a cylinder or oil cylinder disposed at the end of the balance mechanism 53 away from the flame retardant guide roller 52, which can be seen in Figure 1 The balance adjustment mechanism 518 shown in the figure is a connecting rod that is adjustable, rotatable, or fixedly set at one end of the swing arm 515, and the connecting rod is connected to the cylinder or oil cylinder, and the other end of the cylinder or oil cylinder is set on the frame; the telescopic rod of the cylinder or oil cylinder is rotatably connected to the swing arm 515, and / or, the other end of the cylinder or oil cylinder is rotatably connected to the frame; thus, the angle of the swing arm 515 can be directly controlled by the telescopic amount of the cylinder or oil cylinder. It is conceivable that the cylinder or oil cylinder can be selected to connect to either side of the fixed rotating shaft 517 on the swing arm 515 (close to the flame-retardant pressure roller 51 or away from the flame-retardant pressure roller 51).

[0078] In other embodiments, the balance adjustment mechanism 518 is a drive motor connected to the fixed shaft 517 and used to directly adjust the angle of the fixed shaft 517; remote or automatic control can be implemented, for example. In still other embodiments, the weight of the balance weight 519 can be adjusted, for example, by replacing different balance weights 519 or adding or removing weights from a balance weight 519.

[0079] Furthermore, the balancing mechanism is not limited to the above embodiments. For example, in some embodiments, the balancing mechanism 53 is an elastic member such as one or more springs, one end of the spring is connected to the frame, and the other end of the spring is connected to the flame retardant pressure roller 51. The elastic force of the spring is used to balance the gravity of the flame retardant pressure roller 51 (and the counterweight) to achieve the desired technical effect. In some other embodiments, the position of the flame retardant pressure roller 51 is directly connected and driven by, for example, a pneumatic cylinder or an oil cylinder.

[0080] As a supplementary explanation, in various embodiments, there are three ways of connecting the fixed shaft 517 and the swing arm 515: the first way is that the fixed shaft 517 is connected to the swing arm 515 by Fig. 9 The push rod kit 55 and other pressure roller fine-tuning devices shown are adjustably fixedly connected to the swing arm 515; the second is that the fixed shaft 517 is directly positioned or fixedly connected to the swing arm 515 by means of keys or bolts; in the above two embodiments, both ends of the fixed shaft 517 are rotationally connected to the frame, for example, connected by bearing seats, so that the fixed shaft 517 can rotate freely and rotate with the swing arm 515, or a motor is set at the outer end of the fixed shaft 517 to directly control the rotation and stillness of the fixed shaft 517; the third is that the fixed shaft 517 and the swing arm 515 are rotationally connected, and the fixed shaft 517 can be optionally fixedly connected or rotationally connected to the frame, and the swing arm 515 can rotate freely without being affected by the rotation of the fixed shaft 517. This solution cannot use a motor to directly control the rotation of the fixed shaft, but can still use a method of directly applying a force to the swing arm 515 or balancing the swing arm 515 itself to control its inclination angle.

[0081] Other adjustable settings of the swing arm 515 are similar to the aforementioned adjustable solution of the counterweight 519 or the pressure roller fine-tuning device, and are not described in detail here. It is understandable that there are many alternative solutions or variant implementations for the above-mentioned specific solutions of the adjustable settings, which are not listed here one by one, and the present invention is not limited to the specific solutions shown in the figure.

[0082] Preferably, a fixed limiting rod 521 is also included, and a longitudinal limiting groove 522 (for example, a strip-shaped or arc-shaped slot, which can be through or not through, preferably through the swing arm 515) is provided on the balancing mechanism 53 (for example, on the swing arm 515), and one end of the fixed limiting rod 521 is set at a fixed position (for example, on the frame), and the other end is clamped in the longitudinal limiting groove 522, which is used to limit the up and down floating of the balancing mechanism 53, prevent the flame-retardant pressure roller 51 from excessive deviation, and make sure that the flame-retardant pressure roller 51 will not squeeze the film with too much force at the position closest to the flame-retardant guide roller 52 that can be reached, causing deformation and other problems. In some other embodiments, the position of the swing arm 515 can be blocked from the outside by means of a block, a gear rod, or a block / baffle or a pull rope at a certain limited position on the periphery of the swing arm 515, so as to achieve the desired limiting effect. For example, the fixed limiting rod 521 is set at a fixed position (for example, on the frame), and the fixed limiting rod 521 is set above and / or below the outside of the balancing mechanism 53. In other words, Fig. 9 Different from the illustrated embodiment, the longitudinal limiting groove 522 is not provided in the balancing mechanism 53 , but the limiting function is achieved by the cooperation between the edge of the balancing mechanism 53 and the fixed limiting rod 521 .

[0083] See also Figures 14 to 19 The present invention also provides a cast film stripping chamber, in which the upstream side of the stripping chamber is sealedly connected to the casting machine, and a stripping roller is provided between the casting machine and the stripping chamber. After casting, part of the solvent is evaporated and the film is initially hardened. The film is stripped from the steel belt at the active drum of the casting machine by the stripping roller 6 on the side close to the stripping chamber, and then enters the stripping chamber to continue to discharge the solvent, longitudinally stretch, etc. On the downstream side of the stripping chamber is a horizontal stretching machine, in which the film is further heated and laterally stretched. On the downstream side of the stripping chamber is a clamping adjustment mechanism, which is used to adjust the angle of the horizontal stretching machine chain clamping (clamping the edge of the film), etc. The relevant basic processes and structures are prior art and will not be elaborated here.

[0084] The stripping chamber is a sealed box structure having at least a film inlet, an outlet and a ventilation system, and the stripping chamber has a multi-roller system after the cast film of the present invention is stripped (the multi-roller system is in Fig.15 The film stripped from the casting machine enters the film inlet, and is subjected to tension control and stretching during transportation in the stripping chamber. At the same time, solvent evaporates from the film, and the solvent gas is discharged from the stripping chamber through the ventilation system and collected and processed. The stripping chamber is isolated from the outside world to prevent the solvent gas from escaping and causing explosion or harming the health of the staff.

[0085] In order to improve the isolation effect of the gas and temperature in the stripping chamber in this solution, a negative pressure air curtain device 7 is provided at the film entrance of the stripping chamber. The negative pressure air curtain device 7 includes a first air exhaust part 71 and a second air exhaust part 72 which are arranged opposite to each other, at least one flow equalizing plate 73 is provided in the first air exhaust part 71 and / or the second air exhaust part 72, the first air exhaust part 71 and the second air exhaust part 72 are respectively located at the upper and lower sides of the film conveying path, and a channel space 74 for the film to pass through is formed between the first air exhaust part 71 and the second air exhaust part 72, and the width of the channel space 74 is adapted to the width of the film.

[0086] It should be noted that the relative relationship between the first exhaust part 71 and the second exhaust part 72 refers to the relative relationship between the exhaust ports. In other words, both of them have through holes (which may be called wind holes) facing inward for air to pass through. The wind holes are, for example, directly opened on the exhaust part (such as a bellows), or the wind holes are located on the flow equalizing plate 73. In order to ensure the negative pressure wind curtain effect, the exhaust part on at least one side is limited to the use of the flow equalizing plate 73 in this solution. And for the adopted flow equalizing plate 73, it can be selected as one piece, or multiple pieces, or a multi-layer structure, which will be further introduced later. The size of the channel space 74 is adapted to the film, which can better ensure the formation of a relatively closed partition on both sides of the negative pressure wind curtain device, specifically the width covering the film, which is generally greater than or equal to the width.

[0087] When the device is working, the first exhaust part 71 and the second exhaust part 72 are used to exhaust air at the same time; the flow equalizer 73 can make the wind speed uniform. If there is no flow equalizer, the wind speed will be higher closer to the exhaust part (such as the exhaust pipe), and the wind speed will not be exhausted at a distance from the exhaust part (such as the exhaust pipe). The channel space 74 is used for the film transported in the process equipment to pass through the middle. The film will not be impacted by a strong airflow when passing through, and the airflow in the two spaces separated by the negative pressure air curtain device will be sucked away by the first exhaust part 71 and the second exhaust part 72 when it reaches the vicinity of the negative pressure air curtain device, so that the airflow in the previous space cannot enter the next space, and vice versa. In this way, the environment of the adjacent spaces is relatively independent, and the ventilation effect of the space inside the equipment is also guaranteed. In this scheme, the negative pressure air curtain device 7 is set on the basis of the existing or required ventilation system. In other words, the negative pressure air curtain device 7 is mainly used to form a wind curtain at the entrance, and the work of providing air flow inside the stripping chamber and timely exhausting the solvent is still mainly achieved by the ventilation system.

[0088] Preferably, the entrance and / or exit of the channel space 74 is provided with an adjustable wind shielding mechanism (or partitioning part) adapted to the film thickness, and the partitioning part is used to further reduce the entrance / exit, reduce the entrance / exit to close to the film thickness, so as to better isolate the front and rear spaces of the negative pressure air curtain device, and avoid the entrance / exit being too large and still allowing gas to escape. For example, the partitioning part includes at least one slit baffle 76 located on the first exhaust part 71 and / or the second exhaust part 72, and the slit baffle 76 is an upper and lower baffle that is sealed and fixed to the outside; the slit baffle 76 forms a slit at the entrance and / or exit of the channel space 74, and the size of the slit is smaller than the channel space 74. The distance between the first exhaust part 71 and the second exhaust part 72 should not be too close, so the size of the entrance and / or exit of the channel space 74 can be further limited by the slit baffle 76, and preferably the position and size of the slit can be adjusted (for example, the slit is formed by two detachable / adjustable baffles). More specifically, for example, the slit is located in the middle between the first exhaust part 71 and the second exhaust part 72, so that the distance between the film and the first exhaust part 71 and the second exhaust part 72 is substantially the same. The slit baffle 76 can allow a thinner film to pass through while preventing the gas in the stripping chamber from escaping. It is conceivable that in other feasible embodiments, the partition part is a plate with a slit, or a pipe-like structure, or is further provided with a guide / filter structure, etc., all of which are intended to play a partition role and do not deviate from the concept of this solution.

[0089] Preferably, it also includes channel side panels 75 arranged on both sides of the outside of the first exhaust section 71 and the second exhaust section 72. The channel side panels 75 and the equalizing plates 73 of the first exhaust section 71 and the second exhaust section 72 together form four side walls of the channel space 74. In practical applications, the position and size of the channel space 74 are not larger than the connecting port of the front and rear spaces, and it is sealed with the connecting port to ensure that the airflow at the connecting port can only flow to the first exhaust section 71 and the second exhaust section 72, and cannot escape from other places around the connecting port. It can be understood that for situations where the process space (stripping chamber) is small or the first exhaust section 71 and the second exhaust section 72 are large, the side walls of the process space can be equivalent to the side walls of the channel space, which can effectively achieve the desired effect, and then there is no need to set the channel side panels 75 (and other structures that limit the connecting port).

[0090] In some embodiments, the first exhaust part 71 and the second exhaust part 72 are both strip-shaped so as to match the width of the space connection port (film inlet); the flow equalizing plate 73 is a porous strip-shaped flat plate, and the flow equalizing plates 73 of the first exhaust part 71 and the second exhaust part 72 are parallel. This solution is small in size and easy to produce and use while being able to achieve the required functions; the air curtain device should not be too large so as not to affect the operation of the main ventilation system too much. In addition, if the air curtain device is too large, it will also affect the size of the overall equipment box, resulting in increased costs and poor thermal insulation effects. The first exhaust part 71 and the second exhaust part 72 are, for example, arranged in correspondence up and down to match the horizontally conveyed film.

[0091] More specifically, the negative pressure air curtain device includes a first airtight wind box 77 and a second airtight wind box 78; the first airtight wind box 77 is connected to a first exhaust pipe 79, and the first airtight wind box 77 forms a first exhaust portion 71 on the side facing the second airtight wind box 78; the second airtight wind box 78 is connected to a second exhaust pipe 710, and the second airtight wind box 78 forms a second exhaust portion 72 on the side facing the first airtight wind box 77. The flow equalizer 73 matches the first airtight wind box 77 and the second airtight wind box 78 to ensure the uniformity of the air flow. The channel side plate 75 and the slit baffle 76 (if any) are arranged on the first airtight wind box 77 and the second airtight wind box 78. Preferably, the first exhaust pipe 79 is arranged on both sides of the first airtight wind box 77, and the second exhaust pipe 710 is arranged on both sides of the second airtight wind box 78; this method of connecting the exhaust pipes on both sides is more conducive to making the air flow uniform at all parts of the flow equalizer 73.

[0092] Furthermore, a wind speed collection device 711 (such as an anemometer) is provided at the flow equalizer 73, and a wind speed regulating mechanism 712 (such as a speed regulating fan, or an air regulating valve independent of the fan, etc.) is connected to the outside of the first exhaust part 71 and / or the second exhaust part 72 through an exhaust duct, so that the wind speed can be monitored and adjusted. Specifically, the first exhaust part 71 and / or the second exhaust part 72 are connected to an exhaust duct, and the exhaust duct includes, for example, a first exhaust duct 79 and a second exhaust duct 710, and the wind speed regulating mechanism 712 is arranged at the outer end of the exhaust duct. Preferably, the wind speed collection device 711 is also electrically connected to the wind speed regulating mechanism 712, and can transmit signals, so as to realize automatic adjustment and control according to the wind speed. More specifically, the ends of the first exhaust duct 79 and the second exhaust duct 710, for example, converge into one pipeline, connected to a wind speed regulating mechanism 712, or the first exhaust duct 79 and the second exhaust duct 710 are respectively connected to their respective wind speed regulating mechanisms.

[0093] Preferably, the flow equalizing plates 73 inside the first exhaust part 71 and / or the second exhaust part 72 are arranged in multiple layers, which can achieve a better flow equalization effect. The multiple layers of the flow equalizing plates 73 are arranged parallel to the film conveying direction or inclined in the film conveying direction; for example Fig.16In the illustrated embodiment, the flow equalizing plate 73 is two layers arranged in parallel (transversely arranged) along the film conveying direction; in other embodiments, the flow equalizing plate 73 is not parallel to the film conveying direction, but is at a certain angle, which is the inclined arrangement. The flow equalizing plate 73 has a plurality of air holes or a plurality of slit holes, and the air holes or slit holes of each layer are arranged relative to each other or staggered. Among them, relative arrangement means that in the wind speed direction, the air holes are corresponding, and the connecting line of the corresponding air holes is consistent with the wind speed direction; and staggered arrangement means that the air holes are staggered in the wind speed direction. In some embodiments, the air holes are, for example, small holes, which are closely arranged on the flow equalizing plate 73; in other embodiments, the air holes are arranged in strip-shaped holes, or the flow equalizing plate 73 is in a grid or mesh shape; or it is a combination of multiple hole types; the slit hole is a slender slit-shaped hole, and the slit hole is, for example, one or more, and the length direction of the slit hole is, for example, parallel to the width direction of the film or inclined at a certain angle.

[0094] Furthermore, a wind curtain outlet is provided on the box wall of the stripping chamber, and the ends of the first exhaust duct 79 and the second exhaust duct 710 are sealedly connected to the air outlet of the sealed box; the specific setting of the exhaust duct can be designed according to the situation, for example, it is connected to the air outlet on the top or side wall of the box. The first exhaust duct 79 and the second exhaust duct 710 are also provided with, for example, an exhaust gas treatment system at the rear end of the fan. In some embodiments, the ventilation system also includes a rear end air supply box, which is located at the bottom of the rear end of the stripping chamber to exhaust air from the dead corner. The rear end air supply box is connected to the outside of the stripping chamber through a pipeline and converges with the pipeline of the negative pressure air curtain device 7 into one pipeline. The specific setting method of the ventilation system other than the negative pressure air curtain device can be selected according to needs. It is not the focus of improvement of this scheme and will not be elaborated here.

[0095] It should be noted that the existing air curtain device is generally formed by blowing out a strong airflow, and is usually not set up on both sides. Moreover, it cannot be used in the stripping room. The film is a wet film with a high solvent content, and the film surface cannot be impacted by a strong airflow, otherwise it will affect the film quality. Therefore, the existing stripping room is not equipped with an air curtain and is a directly connected structure. Although there is a ventilation system to provide negative pressure, there will be gas leakage. The negative pressure air curtain device can be optionally arranged at the input end of the equipment box, and can separate and divide different process environment areas such as temperature zones, so as to meet various complex process requirements. At the same time, due to the existence of the negative pressure air curtain, a local transition area between the process environment areas can also be formed to avoid problems such as sudden temperature changes of the film after entering a certain area. In the negative pressure air curtain device, two relatively arranged exhaust parts simultaneously exhaust air, and both are provided with flow equalizing plates to ensure the uniformity of air flow intensity. A negative pressure air curtain is formed in the channel space between the two exhaust parts, and the film can be transmitted in the front and rear spaces through the channel space. Since there is a negative pressure air curtain between the two spaces, the mutual influence of temperature and gas between the two spaces (such as escape / interconnection of gases with different temperatures and different component contents) is avoided, effectively ensuring the accuracy and stability of high-end processes in controlling the process environment.

[0096] The stripping chamber has an inspection entrance and exit, and a buffer room at the inspection entrance and exit (equivalent to the inside of the side wall of the stripping chamber). The buffer room is a small space that can be separated from the stripping chamber independently. There are one or more buffer rooms, for example, the buffer room is located at the front end (film input end) of the left and / or right side of the stripping chamber. The buffer room is provided with an inner door of the buffer room on the side close to the inside of the stripping chamber, and the buffer room is provided with an outer door of the buffer room on the side away from the inside of the stripping chamber. When the stripping chamber is working, the inner door and the outer door of the buffer room are both sealed and closed; during maintenance, the staff first opens the outer door of the buffer room to enter the buffer room, closes the outer door of the buffer room, and then opens the inner door of the buffer room to enter the stripping chamber, thereby preventing the solvent in the stripping chamber from leaking. In particular, the stripping chamber is usually in a slightly positive pressure state, so if there is no double-layer door structure of the present scheme, the solvent can easily escape and pollute the external air during maintenance.

[0097] Preferably, the multi-roller system in the stripping room is located higher than the ground. For example, the distance between the lowest roller in the multi-roller system and the floor of the stripping room is greater than one meter, and most rollers are arranged at a height of about 2.2 meters, especially for rollers near the door of the buffer room. This arrangement can prevent dust from being raised on the ground and sticking to the film during operation. It should be noted that both the stripping room and the outside are clean spaces, but it can only ensure that the proportion of dust in the space is extremely low, not that there is no dust at all; in existing equipment, the rollers may be usually placed close to the ground for reasons such as convenient maintenance, and this solution takes into account the high quality requirements of high-end films, and has been improved from the perspective of roller arrangement height, which is easily overlooked, to further ensure the quality of the film.

[0098] The stripping roller 6 is preferably an active roller, that is, the stripping roller 6 is connected to a driving mechanism such as a motor, so as to actively provide power for the stripping roller 6 to rotate. Compared with the conventional equipment in which the stripping roller is a passive roller and is driven to rotate by the active drum of the casting machine at the front end, the force applied during the stripping process of this preferred solution is more uniform and controllable, which helps to obtain a film with better uniformity. More preferably, the stripping roller 6 is adjustably arranged on the frame, so that the position of the stripping roller 6 can be adjusted according to the process requirements, especially the distance between the stripping roller 6 and the active drum. The film to be stripped is on the steel belt at the active drum, and the wrap angle of the film stripping can be adjusted by adjusting the distance, thereby affecting the stripping force, stretching effect, etc. The position of the stripping roller in the conventional equipment is fixed, and the stripping wrap angle, etc. are also fixed and cannot be adjusted. The position of the stripping roller 6 can be adjusted in a variety of ways. For example, a frame is provided with a track, the length direction of the track is the front-to-back direction, both ends of the stripping roller 6 are slidably connected to the track through a roller frame, and a screw rod is threadedly connected to the roller frame, the length direction of the screw rod is the front-to-back direction, and a motor and / or a hand wheel is connected to the end of the screw rod, so that the front and back movement of the stripping roller 6 can be controlled with high precision by rotating the screw rod; further preferably, the frame is also provided with a ruler, the length direction of the ruler is the front-to-back direction, and the roller frame of the stripping roller 6 is provided with a pointer portion, and the pointer portion is a pointing ruler, so as to facilitate the precise adjustment of the position of the stripping roller 6.

[0099] To sum up, in the multi-roller system after the cast film is peeled off of the present invention, the two traction rollers are active rollers, and the path of the film is S-shaped to bypass the two traction rollers, which serves to increase the wrap angle and achieve tension isolation. The existing scheme usually uses a pressure roller method to isolate the front and rear tensions during the film transportation process, but because the film here is a wet film containing more solvents, if the pressure roller method is used, embossing will occur, affecting the film thickness, etc., so this special traction roller structure is designed; and, in this scheme, a gravity roller is arranged behind the traction roller to provide constant tension by gravity or other means, thereby achieving tension adjustment and performing micro-longitudinal stretching; thereby improving the film quality. It is more preferred to provide pressure wheels on both sides to assist in flattening the edges of the film and prevent the edges of the film from curling up; and a flame retardant roller, which gently presses on the film with a slight pressure, will not affect the surface flatness and thickness of the film, and can extinguish the fire when the film burns and catches fire. It has a simple structure and low cost, and does not require motor control or spraying of fire extinguishing agents, but instead relies on physical means to extinguish the fire; it is understandable that the conversion between the non-closed state and the closed state of the flame retardant roller assembly can be achieved manually, electrically or automatically, for example, manually controlled after a fire is discovered, or equipped with a fire monitoring device, which performs automatic control after a fire occurs and is extinguished.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; obviously, the described embodiments are part of the embodiments of the present invention, rather than 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; for ease of description, only the parts related to the relevant utility model are shown in the accompanying drawings. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other; modifying the technical solutions recorded in the aforementioned embodiments, or replacing some of the technical features therein by equivalents, does not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-roll system after cast film peeling, characterized in that: It includes a guide roller, a traction roller and a gravity roller arranged on a multi-roller system frame; the guide roller is a driven roller; the traction roller is located on the downstream side of the stripping roller, and one or more guide rollers are spaced between the traction roller and the stripping roller; the traction roller includes two adjacent active rollers, and the film conveying path is an S-shaped structure at the traction roller; the gravity roller is located on the downstream side of the traction roller, and one or more guide rollers are spaced between the gravity roller and the traction roller; the gravity roller is a driven roller, and the upstream and downstream sides of the gravity roller are adjacent to the guide roller, and the height position of the gravity roller is lower than the guide rollers on both sides thereof; the gravity roller and the gravity roller counterweight mechanism are arranged on the same closed chain or are respectively arranged on two closed chains through a synchronous transmission mechanism.

2. The multi-roll system after cast film peeling according to claim 1, characterized in that: The closed chain includes a roller chain and a counterweight chain, and the gravity roller and the gravity roller counterweight mechanism are respectively arranged on the roller chain and the counterweight chain; the roller chain is in a vertically arranged ring shape, and the roller chain is drivingly connected to the roller sprocket located at its upper and lower ends; the roller chain is connected with a floating block, and the gravity roller is rotatably connected to the floating block; the synchronous transmission mechanism includes a gravity roller synchronous shaft, and the upper and / or lower roller sprockets are coaxially connected to the counterweight sprocket through the gravity roller synchronous shaft, and the counterweight sprocket is transmission-connected to the counterweight chain; the counterweight chain is in a vertically arranged ring shape, and the counterweight chain is connected with the gravity roller counterweight mechanism; the roller sprocket and the counterweight sprocket are both rotatably arranged on the frame.

3. The multi-roll system after stripping of cast film according to claim 1, characterized in that: It also includes two side pressing wheels, which are arranged at the two side edge positions of the multi-roller system, and the two side pressing wheels are located on the upper side and / or lower side of the film conveying path, and there is a gap between the two side pressing wheels and the film conveying path.

4. The multi-roll system after cast film peeling according to claim 3, characterized in that: The two side pressing wheels form a group and are correspondingly located at the two side edges of the film; the side pressing wheels form multiple groups and are arranged along the film conveying path; the side pressing wheels are located between two adjacent rollers in the multi-roller system.

5. The multi-roll system after cast film peeling according to claim 3, characterized in that: The pressure wheels on both sides include a pressure wheel base, a pressure wheel track frame and a pressure wheel positioning part which are connected in sequence; a pressure wheel roller is rotatably connected to the pressure wheel positioning part; the pressure wheel track frame is provided with a bar track, and the pressure wheel positioning part is adjustably arranged on the bar track through a track locking mechanism; the pressure wheel track frame is rotatably connected to the pressure wheel base at one end in the length direction of the bar track, and is provided with a rotating shaft locking mechanism; the pressure wheel base is fixedly connected to the multi-roller system frame.

6. The multi-roller system after stripping of the cast film according to any one of claims 1 to 5, characterized in that: It also includes a flame retardant roller assembly, which includes a flame retardant pressure roller and a flame retardant guide roller. The flame retardant pressure roller is arranged on a balancing mechanism, and the flame retardant guide roller is one of the guide rollers. Under normal conditions, the flame retardant pressure roller and the flame retardant guide roller are in a non-closed state. Under a fire condition, the balancing mechanism drives the flame retardant pressure roller and the flame retardant guide roller to close.

7. The multi-roll system after cast film peeling according to claim 6, characterized in that: The balancing mechanism includes a group of swing arms, and the flame-retardant pressure roller is arranged between the group of swing arms. A fixed rotating shaft and a balancing adjustment mechanism are also arranged on the swing arm. The flame-retardant pressure roller is arranged on one side of the working position of the flame-retardant guide roller through the fixed rotating shaft, and the closing and opening between the flame-retardant pressure roller and the flame-retardant guide roller are realized through the balancing adjustment mechanism.

8. The multi-roller system after stripping of the cast film according to any one of claims 1 to 5, characterized in that: At least three guide rollers are arranged between the traction roller and the stripping roller to form a cooling conveying section.

9. A cast film stripping chamber, characterized in that: The stripping chamber is a sealed box structure having at least a film inlet, an outlet and a ventilation system, and the stripping chamber has a multi-roller system after stripping the cast film according to any one of claims 1-8.

10. The cast film stripping chamber according to claim 9, characterized in that A negative pressure air curtain device is arranged at the film entrance of the stripping chamber, and the negative pressure air curtain device includes a first exhaust part and a second exhaust part which are arranged relatively to each other. At least one flow equalizing plate is arranged in the first exhaust part and / or the second exhaust part. The first exhaust part and the second exhaust part are respectively located on the upper and lower sides of the film conveying path. A channel space for the film to pass through is formed between the first exhaust part and the second exhaust part, and the width of the channel space is adapted to the width of the film.

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