Flattening and conveying mechanism of film material for PVC film processing

Abstract

The invention relates to the technical field of PVC (polyvinyl chloride) film conveying devices, in particular to a flattening and conveying mechanism of a film material for PVC film processing, which comprises a rack, a first conveying roller and a second conveying roller are arranged on the rack, a support rod is arranged between the first conveying roller and the second conveying roller, one end of the support rod is connected with a first abutting plate, and the other end of the support rod is connected with a second abutting plate. A second abutting plate is connected to the position, close to the sliding position, of the supporting rod, when one side of the PVC film is cut, the other side of the PVC film can be subjected to abutting force, the situation that the film is prone to deviation when a blade is arranged on only one side is avoided, the blowing assembly is arranged, the blowing force of the blowing assembly is in negative correlation with the opening performance of the PVC film, and when the opening performance of the film is poor, the film can be cut off. The blowing force is automatically increased to open the film; and when the opening performance is good, the blowing force is properly weakened, wrinkles on the outer side of the film are effectively avoided, the conveying quality of the film is improved, and the applicability of the device is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of PVC film conveying devices, and particularly to a flattening and feeding mechanism for film materials used in PVC film processing. Background Art

[0002] The film flattening and conveying mechanism is a device for processing film materials, and its main function is to ensure that the film remains flat during the conveying process, avoiding problems such as wrinkles and bubbles, so as to ensure the quality and efficiency of subsequent processing.

[0003] After the blown film injection molding machine blows out the tubular film, it needs to be edge-trimmed and wound up to become a common sheet-like film. When edge-trimming, sometimes unilateral edge-trimming is required. At this time, a pulling force is applied to one end of the tubular film to keep the film taut for convenient cutting. However, applying a unilateral pulling force will cause the film to shift and the cutting accuracy to deteriorate. At the same time, when the tubular film is wound up, two layers of the film overlap and produce wrinkles. For films with poor openness, it is difficult to separate the films, which is neither convenient for edge-trimming nor for flattening. Summary of the Invention

[0004] Based on this, in view of the problem that when the current tubular film is wound up, if the openness is poor, it will be difficult to separate the films, making it inconvenient for edge-trimming and flattening and winding, it is necessary to provide a flattening and feeding mechanism for film materials used in PVC film processing.

[0005] The above object is achieved by the following technical solutions: A flattening and feeding mechanism for film materials used in PVC film processing, comprising: A frame, on which a first conveying roller and a second conveying roller that are parallel to each other and spaced apart are rotatably provided, and a PVC film is wound around the first conveying roller and the second conveying roller; A support rod, which is located between the first conveying roller and the second conveying roller. The axis of the support rod is parallel to the axis of the first conveying roller. One end of the support rod is axially slidably provided on the frame. A first abutting plate is fixedly provided at the other end of the support rod. The first abutting plate abuts against one side of the PVC film. A second abutting plate is axially slidably provided at a position of the support rod far from the first abutting plate. A blade is provided on the second abutting plate, and the blade cuts the other side of the PVC film; A blowing assembly, which is used to blow air into the PVC film, and the blowing force of the blowing assembly is negatively correlated with the openness of the PVC film.

[0006] Further, a guide block is fixedly connected to the frame. The support rod slides through the guide block. A first elastic member is sleeved on the outer periphery of the support rod. The first elastic member pushes the first abutting plate and the second abutting plate away from each other to tension the PVC film.

[0007] Further, the air blowing assembly includes an air blowing plate and a friction plate. The air blowing plate is fixedly connected to the second abutting plate. A plurality of first air blowing holes are formed in the second abutting plate. The air blowing plate and the second abutting plate are hollow inside and communicate with each other. The friction plate is vertically slidably arranged on the second abutting plate. Two surfaces of the friction plate are respectively in frictional contact with the inner wall of the PVC film. The friction plate slides vertically to change the size of the channel communicating the air blowing plate and the second abutting plate. The size of the channel is negatively correlated with the openness of the PVC film.

[0008] Further, an air flow channel is arranged inside the air blowing plate. A blocking block is vertically slidably arranged inside the air blowing plate. An air flow hole is formed in the blocking block. The air flow hole communicates with the air flow channel.

[0009] Further, a transverse sliding groove is arranged inside the air blowing plate. One end of the blade is located in the transverse sliding groove. The other end of the blade is hinged to the friction plate. The upper end surface of the blocking block is an inclined surface. One end of the blade located in the transverse sliding groove is in sliding contact with the inclined surface. One end of the blade slides in the transverse sliding groove to push the blocking block to move vertically.

[0010] Further, a second elastic member is arranged between the blocking block and the air blowing plate. The second elastic member can push the blocking block to move upward or make the blocking block have a tendency to move upward.

[0011] Further, the support rod is hollow inside. A plurality of second air blowing holes are formed in the outer periphery of the support rod. The inside of the support rod communicates with the inside of the second abutting plate.

[0012] Further, a third elastic member is arranged between the friction plate and the second abutting plate. The third elastic member makes the friction plate reset or makes the friction plate have a tendency to reset.

[0013] Further, spiral grooves are arranged on the outer peripheries of the first conveying roller and the second conveying roller. And the spiral grooves have two sections. The two sections of spiral grooves are symmetrically arranged about the midpoints of the first conveying roller and the second conveying roller. The rotation directions of the two sections of spiral grooves are opposite. The two sections of spiral grooves flatten the PVC film.

[0014] Further, a driving mechanism is arranged on the frame. The driving mechanism is used to drive the first conveying roller and the second conveying roller to rotate.

[0015] The beneficial effects of the present invention are: The present invention provides a first abutting plate and a second abutting plate. When cutting one side of the PVC film, the other side can receive an abutting force, avoiding the situation that the film is prone to deviation when only a blade is provided on one side, ensuring the stability of the film during the cutting process, thereby improving the cutting accuracy. Moreover, the blowing force of the blowing component is negatively correlated with the openness of the PVC film. When the openness of the film is poor, the blowing force is automatically increased to expand the film; when the openness is good, the blowing force is appropriately weakened, which can not only ensure that the film is effectively expanded but also be flexibly adjusted according to the actual situation, effectively avoiding the generation of wrinkles on the outer side of the film, improving the conveying quality of the film, and enhancing the applicability of the device.

[0016] In the present invention, the blade is used as a connecting piece for pushing the stop block to move. During the working process, the angle of the blade will change, thereby changing the contact position with the PVC film, avoiding excessive wear caused by the blade always cutting the film at a certain position, and prolonging the service life of the blade.

[0017] The present invention provides two spiral grooves on the outer circumferences of the first conveying roller and the second conveying roller. When the first conveying roller and the second conveying roller rotate, the spiral grooves generate a force to pull the film to move towards both ends, effectively flattening the PVC film and ensuring that the film remains flat during the conveying process, providing good conditions for subsequent processing. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of a flattening and feeding mechanism for a film material used in PVC film processing according to an embodiment of the present invention; Figure 2 It is Figure 1 a perspective view of the PVC film of the flattening and feeding mechanism for a film material used in PVC film processing according to an embodiment of Figure 3 It is Figure 2 a partial enlarged view of part X of the flattening and feeding mechanism for a film material used in PVC film processing according to an embodiment of Figure 4 It is Figure 1 a left view of the flattening and feeding mechanism for a film material used in PVC film processing according to an embodiment of Figure 5 It is Figure 4 a partial enlarged view of part Y of the flattening and feeding mechanism for a film material used in PVC film processing according to an embodiment of Figure 6 It is Figure 1 a front view of the flattening and feeding mechanism for a film material used in PVC film processing according to an embodiment of Figure 7 It is Figure 6 a sectional view along A - A of the flattening and feeding mechanism for a film material used in PVC film processing according to an embodiment of Figure 8 It isFigure 7 Partial enlarged view of part Z of the flattening and feeding mechanism for the film material used in pvc film processing provided by one embodiment; Figure 9 Exploded view of the flattening and feeding mechanism for the film material used in pvc film processing provided by one embodiment of the present invention; Figure 10 Diagram showing the state where no wrinkles are generated on the outer side of the pvc film; Figure 11 Diagram showing the state where wrinkles are generated on the outer side of the pvc film.

[0019] Wherein: 100, frame; 110, first conveying roller; 120, second conveying roller; 130, spiral groove; 140, guiding block; 150, limiting rod; 160, locking ring; 170, threaded ejector rod; 180, first elastic member; 190, blade; 200, first abutting plate; 210, second abutting plate; 211, first air blowing hole; 220, support rod; 221, second air blowing hole; 222, air inlet hole; 230, air blowing plate; 231, air flow channel; 232, transverse sliding groove; 233, connecting pipe; 240, stop block; 241, air flow hole; 250, second elastic member; 260, friction plate; 270, third elastic member.

[0020] 300, pvc film. Detailed implementation manners

[0021] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, both include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0023] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0024] The following will refer to Figures 1 - 11 to describe a flattening and feeding mechanism for a film material used in PVC film processing provided by the present invention.

[0025] A flattening and feeding mechanism for a film material used in PVC film processing, suitable for flattening and conveying PVC films, includes a frame 100. On the frame 100, a first conveying roller 110 and a second conveying roller 120 are arranged in parallel and at intervals. The first conveying roller 110 is located above the second conveying roller 120. A PVC film 300 is wound around both the first conveying roller 110 and the second conveying roller 120. When the first conveying roller 110 and the second conveying roller 120 rotate, they can drive the PVC film 300 to move, thereby realizing the function of conveying the PVC film 300. A support rod 220 is arranged between the first conveying roller 110 and the second conveying roller 120. The axis of the support rod 220 is parallel to the axes of the first conveying roller 110 and the second conveying roller 120. One end of the support rod 220 is slidably arranged on the frame 100, and the other end of the support rod 220 is suspended, and a first abutting plate 200 is fixedly arranged at this end. The first abutting plate 200 is arranged vertically and abuts against one side of the PVC film 300 (this PVC film 300 is a tubular film, and after being extruded, it forms a sheet, and one side of the film needs to be cut). A second abutting plate 210 is slidably arranged at a position of the support rod 220 away from the first abutting plate 200, that is, a second abutting plate 210 is slidably arranged at the end of the support rod 220 close to the sliding connection. The second abutting plate 210 is also arranged vertically, and the second abutting plate 210 and the first abutting plate 200 are symmetrically arranged on the support rod 220. Different from the first abutting plate 200, a blade 190 is arranged on the second abutting plate 210. The blade 190 is used to cut the other side of the PVC film 300. After one side of the PVC film 300 is cut, it continues to be conveyed by the second conveying roller 120.

[0026] A blowing component is arranged on the second abutting plate 210. The blowing component can blow air into the PVC film 300, so that a part inside the PVC film 300 is expanded, which is convenient for the blade 190 to cut the PVC film 300. And the expanded part can unfold the PVC film 300 that is not in contact with the first conveying roller 110 and the second conveying roller 120, preventing wrinkles from being generated. It can be understood that since only one surface of the PVC film 300 is in contact with the first conveying roller 110 and the second conveying roller 120 during the process of being conveyed by the first conveying roller 110 and the second conveying roller 120, and the other outer surface cannot be in contact with the first conveying roller 110 and the second conveying roller 120, so after the PVC film 300 is filled with gas, the outer PVC film 300 can be expanded, preventing the outer PVC film 300 from generating wrinkles. For example, the state when wrinkles are generated on the outer side is as Figure 11 shown, and the state when no wrinkles are generated is as Figure 10 shown.

[0027] It should be noted that the blowing force of the blowing component in the present invention is negatively correlated with the opening property of the PVC film 300 (the opening property refers to the degree of adhesion between the inner and outer layers of the PVC film 300). That is to say, when the opening property of the PVC film 300 is poor, it means that the degree of adhesion between the inner and outer layers of the PVC film 300 is large, and it is difficult to expand the inner and outer layers of the PVC film 300. Therefore, it is necessary to increase the blowing force of the blowing component so that the inner and outer PVC films 300 can be expanded; similarly, when the opening property of the PVC film 300 is good, it means that the degree of adhesion between the inner and outer layers of the PVC film 300 is small, and it is relatively easy to expand the inner and outer layers of the PVC film 300. Therefore, the blowing force of the blowing component can be appropriately weakened, and the inner and outer PVC films 300 can still be expanded after weakening the blowing force of the blowing component.

[0028] Through the above settings of the first abutting plate 200 and the second abutting plate 210, it can be ensured that when one side of the PVC film 300 is cut, the other side can also receive an abutting force, thus avoiding the situation that the PVC film 300 is prone to deviation when the blade 190 is only arranged on one side. And by arranging the blowing component, the PVC film 300 can be expanded by a part, enabling the blade 190 to cut the PVC film 300 better. The arrangement of the blowing component can also prevent the outer PVC film 300 from generating wrinkles, thereby improving the conveying quality of the PVC film 300 and enabling the PVC film 300 to be conveyed smoothly.

[0029] Specifically, a guide block 140 is fixedly arranged on the rack 100 of this embodiment. The guide block 140 is fixed on the rack 100 through two fixing rods on the rack 100. A sliding hole is formed in the guide block 140, and the support rod 220 passes through the sliding hole and is slidably arranged in the guide block 140. The guide block 140 plays a guiding role to prevent the support rod 220 from tilting. A first elastic member 180 is sleeved on the outer periphery of the support rod 220. The first elastic member 180 is a tension spring. One end of the first elastic member 180 pulls the second abutting plate 210, and a locking ring 160 is arranged at the other end of the first elastic member 180. The locking ring 160 can fix one end of the first elastic member 180 on the support rod 220. Since one end of the support rod 220 is suspended, and a first abutting plate 200 is fixedly arranged on the suspended end. To adapt to pvc films 300 of different widths, one end of the first elastic member 180 pulls the second abutting plate 210, and the other end of the first elastic member 180 is fixed on the support rod 220 through the locking ring 160. And the first abutting plate 200 is fixed on the support rod 220. So it is equivalent to one end of the first elastic member 180 pulling the first abutting plate 200. At this time, the pulling force of the first elastic member 180 can make the first abutting plate 200 and the second abutting plate 210 have a tendency to move away from each other, so as to be able to tension the pvc film 300, which is convenient for the blade 190 on the second abutting plate 210 to cut one side of the pvc film 300.

[0030] It should be noted that the setting of the locking ring 160 can adjust the acting force of the first elastic member 180 to tension the pvc film 300. When the locking ring 160 is loosened, the operator can adjust the position of the locking ring 160 according to actual needs, and then lock the locking ring 160 after adjustment. As Figure 5 shown, when it is necessary to increase the tension force of the pvc film 300, the locking ring 160 can be moved to the right on the support rod 220. When it is necessary to reduce the tension force of the pvc film 300, the locking ring 160 can be moved to the left on the support rod 220.

[0031] A threaded ejector rod 170 is arranged on the locking ring 160 in this embodiment. The threaded ejector rod 170 is helically connected to the side wall of the locking ring 160. When it is necessary to move the locking ring 160, rotate the threaded ejector rod 170 to loosen the pressing of the threaded ejector rod 170 on the support rod 220. When it is necessary to fix the locking ring 160, rotate the threaded ejector rod 170 in the reverse direction to make the threaded ejector rod 170 press tightly against the support rod 220.

[0032] More specifically, as Figure 3 、 Figure 7 and Figure 8As shown in the figure, the blowing component in this embodiment includes a blowing plate 230 and a friction plate 260. The blowing plate 230 is fixedly connected to the second abutting plate 210. A plurality of first blowing holes 211 are formed in the second abutting plate 210. Both the blowing plate 230 and the second abutting plate 210 are hollow inside, and the blowing plate 230 is communicated with the second abutting plate 210. A connecting pipe 233 is arranged on the blowing plate 230. The connecting pipe 233 is used to connect an air pump (not shown in the figure). When the air pump works, it inflates the blowing plate 230, and the gas can be blown out through the first blowing holes 211 on the second abutting plate 210 to fill the inside of the PVC film 300 with gas. The friction plate 260 is vertically slidably arranged on the second abutting plate 210. The two surfaces of the friction plate 260 are respectively in frictional contact with the inner wall of the PVC film 300. When the first conveying roller 110 and the second conveying roller 120 convey the PVC film 300, the PVC film 300 located between the first conveying roller 110 and the second conveying roller 120 moves downward. The inner wall of the PVC film 300 frictions with the two surfaces of the friction plate 260, so as to drive the friction plate 260 to move in the vertical direction, and it is a vertical downward movement. When the friction plate 260 moves vertically downward, it can change the channel size of the communication between the blowing plate 230 and the second abutting plate 210. The size of the channel is negatively correlated with the openness of the PVC film 300. That is to say, the worse the openness of the PVC film 300, the larger the size of the channel; the better the openness of the PVC film 300, the smaller the size of the channel. Specifically, the more the friction plate 260 moves downward, the larger the channel size of the communication between the blowing plate 230 and the second abutting plate 210.

[0033] It should be noted that when the PVC film 300 moves downward to drive the friction plate 260 to move downward, the worse the openness of the PVC film 300 indicates that the bonding degree between the inner and outer layers of the PVC film 300 is greater. At this time, the friction force between the inner wall of the PVC film 300 and the two surfaces of the friction plate 260 is greater, so as to drive the friction plate 260 to move farther downward. At this time, the channel size between the blowing plate 230 and the second abutting plate 210 is larger, so that more gas passes through the channel, which also increases the blowing force of the first blowing holes 211 on the second abutting plate 210; when the PVC film 300 moves downward to drive the friction plate 260 to move downward, the better the openness of the PVC film 300 indicates that the bonding degree between the inner and outer layers of the PVC film 300 is smaller. At this time, the friction force between the inner wall of the PVC film 300 and the two surfaces of the friction plate 260 is smaller, so as to drive the friction plate 260 to move closer downward. At this time, the channel size between the blowing plate 230 and the second abutting plate 210 is smaller, so that the gas passing through the channel is reduced, which also weakens the blowing force of the first blowing holes 211 on the second abutting plate 210.

[0034] In a further embodiment, to achieve the function of vertically moving the friction plate 260 to change the channel size, as Figure 8 shown, an air flow channel 231 is provided in the air blowing plate 230, and a stopper 240 is slidably arranged vertically in the air blowing plate 230. An air flow hole 241 is formed in the stopper 240, and the air flow hole 241 communicates with the air flow channel 231. When there is an overlapping part between the air flow hole 241 and the air flow channel 231, gas can pass through. Therefore, the overlapping part of the air flow hole 241 and the air flow channel 231 constitutes the above-mentioned channel. When the stopper 240 slides in the vertical direction, the size of the overlapping part of the air flow hole 241 and the air flow channel 231 can be changed, thereby changing the size of the channel.

[0035] Specifically, as Figure 8 shown, a horizontal sliding groove 232 is provided in the air blowing plate 230. One end of the blade 190 is slidably arranged in the horizontal sliding groove 232, and the other end of the blade 190 is hinged to the friction plate 260. Therefore, when the friction plate 260 moves in the vertical direction, it can drive one end of the blade 190 to slide in the horizontal sliding groove 232. In the initial state, as Figure 8 shown, one end of the blade 190 is located at the leftmost side of the horizontal sliding groove 232. When the friction plate 260 moves downward, it can push one end of the blade 190 to slide from the left side to the right side in the horizontal sliding groove 232. The upper end surface of the stopper 240 in this embodiment is an inclined surface. When one end of the blade 190 slides from left to right in the horizontal sliding groove 232, one end of the blade 190 is simultaneously in sliding contact with the inclined surface of the upper end surface of the stopper 240. The height on the left side of the inclined surface is lower than that on the right side. Therefore, one end of the blade 190 can push the stopper 240 downward, so that the overlapping part of the air flow hole 241 on the stopper 240 and the air flow channel 231 increases, thereby increasing the size of the channel and allowing more air flow to blow out from the first air blowing hole 211.

[0036] To facilitate the reset of the stopper 240, a second elastic member 250 is arranged between the stopper 240 and the air blowing plate 230. The second elastic member 250 is a compression spring. One end of the second elastic member 250 is fixedly connected to the bottom of the stopper 240, and the other end of the second elastic member 250 is fixedly connected to the inside of the air blowing plate 230. The second elastic member 250 can make the stopper 240 move upward or make the stopper 240 have a tendency to move upward.

[0037] It should be noted that in the present invention, the blade 190 is used as a connecting member for pushing the stopper 240 to move, which can cause the angle of the blade 190 to change. When the angle of the blade 190 changes, the position where the blade 190 contacts the PVC film 300 can be changed, so that it can be avoided that a certain position of the blade 190 always cuts the PVC film 300, resulting in an increase in the wear degree of the blade 190. If the contact position between the blade 190 and the PVC film 300 is continuously changed, the increase in the wear degree of the blade 190 can be avoided, thereby prolonging the service life of the blade 190.

[0038] In a further embodiment, to enhance the blowing effect, as Figure 3 and Figure 8 shown, the present invention sets the support rod 220 to have a hollow internal structure, and a plurality of second air blowing holes 221 are opened on the support rod 220. An air inlet hole 222 is provided at the sliding connection between the support rod 220 and the second abutting plate 210. The inside of the second abutting plate 210 is communicated with the inside of the support rod 220 through the air inlet hole 222. This setting can enable the support rod 220 to also blow air into the PVC film 300, thereby further improving the blowing effect.

[0039] It should be noted that, as Figure 3 and Figure 5 shown, the present invention provides a limiting rod 150 on the frame 100. The limiting rod 150 passes through the guiding block 140 and approaches the air blowing plate 230, so that the sliding distance of the second abutting plate 210 on the support rod 220 is limited. Therefore, the air inlet hole 222 on the support rod 220 is opened within the range where the second abutting plate 210 slides on the support rod 220, preventing the air inlet hole 222 from detaching from the second abutting plate 210.

[0040] Specifically, the first abutting plate 200 in the embodiment of the present invention is also provided with a hollow interior, and a plurality of first air blowing holes 211 are also opened on the first abutting plate 200. The first abutting plate 200 is communicated with the inside of the support rod 220, so that the first abutting plate 200 blows out gas through the first air blowing holes 211, thereby further improving the blowing effect.

[0041] In a further embodiment, to enable the friction plate 260 to adapt to various open PVC films 300, the friction plate 260 needs to be able to move upward to reset. Therefore, a third elastic member 270 is provided between the friction plate 260 and the second abutting plate 210. The third elastic member 270 is also a compression spring. One end of the third elastic member 270 is fixedly connected to the friction plate 260, and the other end of the third elastic member 270 is fixedly connected to the second abutting plate 210. Thus, the friction plate 260 can move upward to reset under the action of the third elastic member 270. The third elastic member 270 can also make the friction plate 260 have a tendency to move upward to reset, so as to be able to adapt to various open PVC films 300 and improve the practicability of the flattening and conveying device for the film material used in PVC film processing.

[0042] Specifically, spiral grooves 130 are provided on the outer peripheries of the first conveying roller 110 and the second conveying roller 120 in this embodiment, and the outer peripheral surfaces of the first conveying roller 110 and the second conveying roller 120 are rough, so as to have frictional force on the PVC film 300. The spiral grooves 130 both have two sections, and the two sections of spiral grooves 130 are symmetrically arranged about the midpoints of the first conveying roller 110 and the second conveying roller 120, and the spiral directions of the two sections of spiral grooves 130 are opposite. When the first conveying roller 110 and the second conveying roller 120 rotate, the two sections of spiral grooves 130 on their outer peripheries have a force to pull the PVC film 300 to move towards both ends of the first conveying roller 110 and the second conveying roller 120, so as to flatten the PVC film 300.

[0043] It should be noted that the setting of the spiral grooves 130 on the outer peripheries of the first conveying roller 110 and the second conveying roller 120 in this embodiment is prior art and will not be described in detail herein.

[0044] In a further embodiment, a driving mechanism (not shown in the figure) is further provided on the frame 100 of the present invention. The driving mechanism is used to drive the first conveying roller 110 and the second conveying roller 120 to rotate. The driving mechanism can be a driving motor (not shown in the figure). A first belt (not shown in the figure) is wound around the rotating shaft of the driving motor, and the first belt is wound around the end of the first conveying roller 110. The driving motor drives the first conveying roller 110 to rotate through the belt. A second belt (not shown in the figure) is provided between the first conveying roller 110 and the second conveying roller 120, and the first conveying roller 110 drives the second conveying roller 120 to rotate through the second belt.

[0045] It should be noted that the driving mechanism is not limited to the above structure and can also be other structures, which will not be described in detail herein.

[0046] Combined with the above embodiments, the specific working process of a flattening and feeding mechanism for the film material used in PVC film processing provided by the present invention is described as follows: The PVC film 300 is wound around the first conveying roller 110 and the second conveying roller 120: First, the PVC film 300 is wound on the first conveying roller 110, and then the PVC film 300 located between the first conveying roller 110 and the second conveying roller 120 passes through the first abutment plate 200, the support rod 220 and the second abutment plate 210, and the end of the PVC film 300 is pulled. At this time, one side of the PVC film 300 is cut by the blade 190 on the second abutment plate 210, and the operator pulls the end of the PVC film 300 again to wind it on the second conveying roller 120, thereby winding the PVC film 300 on the first conveying roller 110 and the second conveying roller 120.

[0047] Adjust the tension: The operator twists the threaded push rod 170 to loosen the locking ring 160, and moves the locking ring 160 on the support rod 220, adjusts the distance between the first abutment plate 200 and the second abutment plate 210 according to the width of the PVC film 300, and adjusts the position of the locking ring 160 on the support rod 220 as needed so that the first abutment plate 200 and the second abutment plate 210 abut against both sides of the PVC film 300. After adjusting the tensioning force, the threaded push rod 170 is twisted in the opposite direction to fix the position of the locking ring 160, thereby completing the adjustment of the tensioning force.

[0048] Start cutting and conveying: The air pump (not shown in the figure) and the driving motor (not shown in the figure) are started. The driving motor drives the first conveying roller 110 and the second conveying roller 120 to rotate. The two-stage spiral grooves 130 on the outer periphery of the first conveying roller 110 and the second conveying roller 120 can flatten the inner part of the PVC film 300 for conveying. The air pump conveys gas into the blowing plate 230. The gas passes through the second abutment plate 210 and enters the inside of the support rod 220 and the first abutment plate 200. The first blowing holes 211 on the first abutment plate 200 and the second abutment plate 210 and the second blowing holes 221 on the outer periphery of the support rod 220 blow air into the inside of the PVC film 300, so that a part of the outer side of the PVC film 300 is stretched open, so that the wrinkles of the outer part of the PVC film 300 that are not in contact with the first conveying roller 110 and the second conveying roller 120 are stretched open, so as to prevent the PVC film 300 from having wrinkles during the conveying process.

[0049] If the opening of the PVC film 300 is poor: During the conveyance of the PVC film 300 at this time, the frictional force between the inner sidewall of the PVC film 300 and the friction plate 260 increases, so that the distance by which the PVC film 300 drives the friction plate 260 to move downward increases. The friction plate 260 slides inside the air blowing plate 230 through one end of the blade 190, thereby pushing the stopper 240 to move downward. The overlapping portion of the air flow holes 241 on the stopper 240 and the air flow channels 231 inside the air blowing plate 230 increases, so that more gas can enter the first abutting plate 200, the second abutting plate 210 and the support rod 220. The amount of gas blown out from the first air blowing holes 211 and the second air blowing holes 221 increases, increasing the air blowing force, so that the PVC film 300 can be better expanded.

[0050] If the PVC film 300 has good openness: During the conveyance of the PVC film 300 at this time, the frictional force between the inner sidewall of the PVC film 300 and the friction plate 260 decreases, so that the distance by which the PVC film 300 drives the friction plate 260 to move downward decreases. The second elastic member 250 at the bottom of the stopper 240 pushes the stopper 240 to move upward. The overlapping portion of the air flow holes 241 on the stopper 240 and the air flow channels 231 inside the air blowing plate 230 decreases, thereby reducing the amount of gas entering the first abutting plate 200, the second abutting plate 210 and the support rod 220. The amount of gas blown out from the first air blowing holes 211 and the second air blowing holes 221 decreases, reducing the air blowing force. Since the PVC film 300 has good openness, a smaller air blowing force can also better expand the PVC film 300.

[0051] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0052] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A flattening and feeding mechanism for film materials used in PVC film processing, characterized in that, Including: A frame, on which a first conveying roller and a second conveying roller that are parallel to each other and spaced apart are rotatably arranged, and a PVC film is wound around the first conveying roller and the second conveying roller; A support rod, which is located between the first conveying roller and the second conveying roller, the axis of the support rod is parallel to the axis of the first conveying roller, one end of the support rod is axially slidably arranged on the frame, a first abutting plate is fixedly arranged at the other end of the support rod, the first abutting plate abuts one side of the PVC film, a second abutting plate is axially slidably arranged at a position of the support rod far from the first abutting plate, and a blade is arranged on the second abutting plate, and the blade cuts the other side of the PVC film; A blowing assembly, which is used for blowing air into the PVC film, and the blowing force of the blowing assembly is negatively correlated with the openness of the PVC film.

2. The flattening and feeding mechanism for the film material used in PVC film processing according to claim 1, wherein, A guide block is fixedly connected to the frame, the support rod slides through the guide block, and a first elastic member is sleeved on the outer periphery of the support rod, and the first elastic member pushes the first abutting plate and the second abutting plate away from each other to tension the PVC film.

3. The flattening and feeding mechanism for the film material used in PVC film processing according to claim 1, wherein, The blowing assembly includes a blowing plate and a friction plate, the blowing plate is fixedly connected to the second abutting plate, a plurality of first blowing holes are opened in the second abutting plate, the blowing plate and the second abutting plate are hollow inside and are communicated with each other, the friction plate is vertically slidably arranged on the second abutting plate, and two surfaces of the friction plate are respectively in frictional contact with the inner wall of the PVC film, and the friction plate vertically slides to change the size of the channel communicated between the blowing plate and the second abutting plate, and the size of the channel is negatively correlated with the openness of the PVC film.

4. The flattening and feeding mechanism for the film material used in PVC film processing according to claim 3, characterized in that, An air flow channel is arranged inside the blowing plate, a blocking block is vertically slidably arranged inside the blowing plate, and an air flow hole is opened in the blocking block, and the air flow hole is communicated with the air flow channel.

5. The flattening and feeding mechanism for the film material used in PVC film processing according to claim 4, characterized in that, A transverse chute is arranged inside the blowing plate, one end of the blade is located in the transverse chute, the other end of the blade is hinged to the friction plate, the upper end surface of the blocking block is an inclined surface, and one end of the blade located in the transverse chute is in sliding contact with the inclined surface, and one end of the blade slides in the transverse chute to push the blocking block to move vertically.

6. The flattening and feeding mechanism for the film material used in PVC film processing according to claim 5, wherein, A second elastic member is arranged between the blocking block and the blowing plate, and the second elastic member can push the blocking block to move upward or make the blocking block have a tendency to move upward.

7. The flattening and feeding mechanism for the film material used in PVC film processing according to claim 3, characterized in that, The support rod is hollow inside, a plurality of second blowing holes are opened on the outer periphery of the support rod, and the inside of the support rod is communicated with the inside of the second abutting plate.

8. The flattening and feeding mechanism for the film material used in PVC film processing according to claim 3, wherein, A third elastic member is arranged between the friction plate and the second abutting plate, and the third elastic member makes the friction plate reset or makes the friction plate have a tendency to reset.

9. The flattening and feeding mechanism for the film material used in PVC film processing according to claim 1, characterized in that, Spiral grooves are arranged on the outer peripheries of the first conveying roller and the second conveying roller, and there are two sections of spiral grooves, and the two sections of spiral grooves are symmetrically arranged about the midpoints of the first conveying roller and the second conveying roller, and the spiral directions of the two sections of spiral grooves are opposite, and the two sections of spiral grooves flatten the PVC film.

10. The flattening and feeding mechanism for the film material used in PVC film processing according to claim 1, characterized in that, A driving mechanism is provided on the frame, and the driving mechanism is used to drive the first conveying roller and the second conveying roller to rotate.

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