Automatic feeding device for film stretcher

Abstract

The invention discloses an automatic feeding device for a film stretcher, and belongs to the technical field of film feeding processing devices.The automatic feeding device comprises an operation table, and the operation table is slidably connected with a box with a feeding opening through an electric sliding rail; the clamping and film-drawing mechanism comprises a driving motor arranged at the center of the bottom end of the inner wall of the box body, an output shaft of the driving motor penetrates through a fixed disc and extends to a rotary disc, and protruding parts on the periphery of the rotary disc are connected with first sliding blocks on the fixed disc through first swing rods; the first sliding blocks are connected with strip-shaped grooves in the length direction of the fixing disc, and the strip-shaped grooves are arranged in a diagonal mode. The film stretching machine solves the technical problems that an existing film stretching machine only conducts simple transverse or vertical stretching and cannot conduct overall diffusion stretching, so that effective performance detection work on a film is not facilitated, hot air flow cannot make uniform contact with the film, and the stretching performance of the film can also be affected.

Description

Technical Field

[0001] The invention belongs to the technical field of film feeding processing devices, and in particular relates to an automatic feeding device for a film stretching machine. Background Art

[0002] Film stretching machine is mainly used to produce uniaxially stretched polyethylene plastic film, such as stretch film, wrapping film and cling film. It consists of three parts: main machine, auxiliary machine and electrical control.

[0003] The film stretching machine is suitable for stretching, peeling, tearing, heat sealing, fiber, silk fiber, bonding and other performance tests of plastic film, composite film, woven bags, soft packaging materials, adhesives, adhesive tapes, self-adhesive labels, rubber, paper and other products. It can automatically obtain a variety of test parameters, and conduct tests and provide data according to relevant domestic and foreign standards. It is widely used in stretching, peeling, tearing and other tests of various non-metallic material samples, as well as special tests of some products.

[0004] Before production, the film needs to be subjected to a corresponding stretching test by a corresponding stretching machine to measure the material's own performance. Existing film stretching machines only perform simple lateral or vertical stretching, but are unable to perform overall diffusion stretching, which is not conducive to effective performance testing of the film. Moreover, when the film is stretched in a heated environment, if the hot air flow cannot evenly contact the film, it will also affect the film's tensile properties, which is not conducive to improving the stretching quality. Summary of the invention

[0005] The purpose of the present invention is to provide an automatic feeding device for a film stretching machine to solve the technical problems that the existing film stretching machine only performs simple horizontal or vertical stretching but cannot perform overall diffusion stretching, which is not conducive to effective performance testing of the film, and the hot air flow cannot contact the film evenly, which will also affect the stretching performance of the film.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: An automatic feeding device for a film stretching machine, comprising: An operating table, wherein the operating table is slidably connected to a box body with a feeding port through an electric slide rail; A film-clamping and film-pulling mechanism, the film-clamping and film-pulling mechanism comprises a driving motor disposed at the center of the bottom end of the inner wall of the box body, the output shaft of the driving motor passes through the fixed disk and extends to the rotating disk, the protrusions around the rotating disk and the first slider on the fixed disk are connected by a first swinging rod, the first slider is connected with a strip groove along the length direction of the fixed disk, the strip groove is arranged diagonally, and the extension section at one end of the first slider is fixedly mounted on the second slider by a tilting rod; Among them, both ends of the first swing arm are installed on the protrusion and the first slider by means of a rotational connection, slots are provided at the corners at both ends of the outer wall of the second slider, a crossbeam is movably retracted between the slots, and the fixed blocks on adjacent second sliders are connected by the second swing arm, the second swing arm is arranged in a polygonal shape, and a movable shaft adapted to it is provided at the node of the second swing arm, a panel fixed to the support block is installed at the bottom end of the movable shaft, one end of the panel is in contact with the crossbeam, and a clamping block is installed at the other end via a return elastic component.

[0007] Furthermore, the return elastic component includes a first rotating shaft on the panel, a return spring connected to the clamping block is provided on the outer wall edge of the first rotating shaft, a clamping cavity is formed between the clamping block and the support block, and one end of the clamping block is connected to a resistance block located above the first rotating shaft, the resistance block is installed on the clamping block by a threaded connection, and one end of the resistance block is installed on the reel by a pull rope Furthermore, a through hole connected to the pull rope is opened on the inner wall of the box, and the reels are distributed around the output shaft of the driving motor. The output shaft of the driving motor and the reel are connected through a conveyor belt transmission. As the driving motor starts, the reel drives the pull rope to move, and through the pulling action of the resistance block, the clamping block connected to the return spring is cooperated, so that the film in the clamping cavity and the clamping block are limited or separated from each other, and at the same time, the second swing rod drives the clamping block to spread out or move closer to the center at the same time.

[0008] Furthermore, it also includes a heating jet mechanism, which includes a first bevel gear fixed on the output shaft of the driving motor, both sides of the outer wall of the first bevel gear are meshed with second bevel gears fixed on the second rotating shaft, one end of the second rotating shaft is fixed on a cam, the top end of the cam is movably fitted on a lifting plate connected to a compression spring, and the compression spring is connected to the side wall of the box body through a top plate.

[0009] Furthermore, the output shaft of the drive motor passes through the first bevel gear and extends to the bearing on the inner wall of the box body. The extension sections on both sides of the bearing are installed with guide rings through brackets. The guide ring is movably connected to the second rotating shaft, and a guide groove connected to the second rotating shaft is provided in the guide ring.

[0010] Furthermore, the guide rings are detachably mounted on the bracket, and are distributed along the length direction of the second rotating shaft.

[0011] Furthermore, a gear plate is fixedly installed on one side of the lifting plate away from the inner wall of the box body, and the outer wall of the gear plate is meshed with a rotating gear fixed on the third rotating shaft. An injection pipe placed in the feeding port is fixedly installed on one end of the third rotating shaft, and the outer wall edge of the injection pipe is provided with a rotating groove placed on the side wall of the box body.

[0012] Furthermore, one end of the jet pipe is connected to a hot air pump placed on the outer wall of the box body through a corrugated hose, and a nozzle is fixedly installed on the other end, and the jet pipe is symmetrically arranged relative to the center of the feeding port. As the driving motor and the hot air pump are started, the gear plate drives the rotating gear to rotate reciprocatingly, and the nozzle sprays the hot air flow evenly onto the film.

[0013] Furthermore, a shielding plate fixed on the pull rod is installed on the operating table, and as the box body moves horizontally on the electric slide rail, the feeding port and the shielding plate are closed or opened to each other.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: (1) A box with an electric slide rail is provided, and the film in the feeding port of the box is directly connected to the external conveyor line, which is convenient for subsequent stretching processing. Through the electric slide rail, it can be easily contacted and fitted with the baffle plate to form a heated closed chamber, which is convenient for controlling the temperature and preventing heat loss.

[0015] (2) A clamping and film-drawing mechanism is provided. When the driving motor is started, the reel can be driven to rotate through the conveyor belt, thereby transmitting the force to the clamping block through the pull rope. At this time, the clamping block remains free to rotate relative to the pull rope. Under the action of the return spring, the clamping block rotates downward and clamps the film on the support block. At the same time, the output shaft of the driving motor can drive the rotation of the turntable. Under the rotation connection of the first swing rod, the first sliders at the diagonal lines around can be driven to move outward at the same time, and then the second slider can be pulled to move synchronously. With the second swing rod set in a multi-diamond shape, the clamping blocks at multiple points on the beam can also move synchronously. Moreover, the beam is movably retracted and connected at the notch. The notch on the second slider can ensure the relative movement of the X-axis and Y-axis directions of the beam in the horizontal direction, thereby achieving the purpose of stretching and spreading in any horizontal direction, improving the stretching quality, and having a good clamping and positioning effect. The stretching area can be adaptively clamped and positioned.

[0016] (3) A return elastic component is provided, which is used in conjunction with the draw rope on the clamping block. One end of the clamping block is rotatably connected to the first rotating shaft on the panel through a return spring, and is also restrained by the draw rope. When the draw rope is in the process of unwinding, the clamping block is no longer subjected to force from the draw rope, and under the action of the return spring, the clamping cavity can be closed. Conversely, when the draw rope is in the process of rewinding, the clamping block rotates in the opposite direction and opens the clamping cavity, thereby facilitating the placement of the film onto the support block.

[0017] (4) A heating jet mechanism is provided. After the driving motor is started, it can drive the rotation of the first bevel gear. Under the action of the gear meshing transmission, the cam on the second rotating shaft is driven to rotate. The cam can convert the rotational force into the linear motion of the lifting plate, and under the action of the gear plate, the rotating gear rotates back and forth, thereby rotating the jet pipe synchronously. When the jet pipe rotates, the hot air flow of the hot air pump can be evenly and effectively sprayed onto the film, thereby facilitating the stretching quality under the heating environment. During the spraying process, the particulate impurities on the film can also be removed by the air flow to ensure the cleanliness of its surface and achieve a certain dust removal effect. In addition, in combination with the shielding plate on the box body, a relatively closed heating environment can be formed to prevent heat dissipation and improve the product inspection quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of an automatic feeding device for a film stretching machine of the present invention; Figure 2 It is a left view of an automatic feeding device for a film stretching machine of the present invention; Figure 3 It is a top view of an automatic feeding device for a film stretching machine of the present invention; Figure 4 is a connection diagram of the drive motor of the present invention; Figure 5 It is a schematic diagram of the connection between the fixed disk and the rotating disk of the present invention; Figure 6 The present invention Figure 1 A magnified image of point A; Figure 7 The present invention Figure 3 A magnified view of point B; Figure 8 It is a schematic diagram of the connection between the clamping block and the support plate of the present invention; Fig. 9 It is a schematic diagram of the meshing transmission between the gear plate and the rotating gear of the present invention.

[0020] Figure numerals: 1, operating table; 2, electric slide rail; 3, clamping and pulling film mechanism; 4, driving motor; 5, fixed plate; 6, turntable; 7, first slider; 8, first swing rod; 9, strip groove; 10, tilt rod; 11, second slider; 12, notch; 13, crossbeam; 14, fixed block; 15, second swing rod; 16, movable shaft; 17, support block; 18, panel; 19, return elastic component; 20, clamping block; 21, first rotating shaft; 22, return Spring; 23. Resistance block; 24. Pull rope; 25. Reel; 26. Conveyor belt; 27. Heating jet mechanism; 28. First bevel gear; 29. ​​Second rotating shaft; 30. Second bevel gear; 31. Cam; 32. Compression spring; 33. Lifting plate; 34. Top plate; 35. Guide ring; 36. Gear plate; 37. Third rotating shaft; 38. Rotating gear; 39. Jet pipe; 40. Corrugated hose; 41. Hot air pump; 42. Nozzle; 43. Shielding plate. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Reference Manual Attached Figure 1 , Figure 2 and Figure 3 As shown, an automatic feeding device for a film stretching machine comprises: an operating table 1, a box body with a feeding port is slidably connected to the operating table 1 through an electric slide rail 2; The film-clamping and film-pulling mechanism 3 includes a driving motor 4 disposed at the center of the bottom end of the inner wall of the box body, the output shaft of the driving motor 4 passes through the fixed disk 5 and extends to the rotating disk 6, the protrusions around the rotating disk 6 and the first slider 7 on the fixed disk 5 are connected by a first swing rod 8, the first slider 7 is connected with a strip groove 9 along the length direction of the fixed disk 5, the strip groove 9 is diagonally arranged, and the extension section at one end of the first slider 7 is fixedly mounted on the second slider 11 by a tilting rod 10; Among them, both ends of the first swing rod 8 are installed on the protrusion and the first slider 7 by means of rotational connection, notches 12 are provided at the corners at both ends of the outer wall of the second slider 11, and a crossbeam 13 is movably retracted between the notches 12, and the fixed blocks 14 on adjacent second sliders 11 are connected by a second swing rod 15, the second swing rod 15 is arranged in a polygonal shape, and a movable shaft 16 adapted to it is provided at the node of the second swing rod 15, and a panel 18 fixed on the support block 17 is installed at the bottom end of the movable shaft 16, one end of the panel 18 is in contact with the crossbeam 13, and a clamping block 20 is installed at the other end through a return elastic component 19.

[0023] A box body with an electric slide rail 2 is provided, and the film in the feeding port on the box body is directly connected to the external conveyor line, which is convenient for subsequent stretching processing. Through the electric slide rail 2, it can be easily contacted and fitted with the baffle plate 43 to form a heated closed cavity, which is convenient for controlling the temperature and preventing heat loss.

[0024] Specifically, the operating table 1 is provided with an electric slide rail 2 connected to the box body, which is mainly for the box body to be able to move horizontally, and in conjunction with the baffle plate 43, the feeding port on the box body can be opened or closed. The pull rod on the baffle plate 43 can also support and fix it to ensure the stability of the connection between the structural parts. In addition, the baffle plate 43 can also cooperate with the electric push rod to move up and down, and can also open and close the feeding port. As for the electric push rod mechanism, it is a conventional technical means for those skilled in the art, and the present invention will not be described in detail herein, nor will it affect the effective implementation of the technical solution of the present invention.

[0025] A return elastic component 19 is provided, and the return elastic component 19 is used in conjunction with a pull rope 24 on a clamping block 20. One end of the clamping block 20 is rotatably connected to a first rotating shaft 21 on a panel 18 through a return spring 22, and is also restrained by the pull rope 24. When the pull rope 24 is in the process of unwinding, the clamping block 20 is no longer subjected to force from the pull rope 24, and under the action of the return spring 22, the clamping cavity can be closed. Conversely, when the pull rope 24 is in the process of winding, the clamping block 20 rotates in the opposite direction and opens the clamping cavity, thereby facilitating the placement of the film onto the support block 17.

[0026] refer to Figure 1 , Figure 6 , Figure 7 and Figure 8The return elastic component 19 includes a first rotating shaft 21 on the panel 18, and a return spring 22 connected to the clamping block 20 is provided on the outer wall edge of the first rotating shaft 21. A clamping cavity is formed between the clamping block 20 and the support block 17, and one end of the clamping block 20 is connected to a resistance block 23 located above the first rotating shaft 21. The resistance block 23 is installed on the clamping block 20 by a threaded connection, and one end of the resistance block 23 is installed on the reel 25 through a pull rope 24.

[0027] A through hole connected to the pull rope 24 is opened on the inner wall of the box, and the reels 25 are distributed around the output shaft of the driving motor 4. The output shaft of the driving motor 4 and the reel 25 are connected through a conveyor belt 26. As the driving motor 4 starts, the reel 25 drives the pull rope 24 to move, and through the pulling action of the resistance block 23, the clamping block 20 connected to the return spring 22 cooperates, the film in the clamping cavity and the clamping block 20 are limited or separated from each other, and at the same time, the second swing rod 15 drives the clamping block 20 to spread out or move toward the center at the same time.

[0028] In the initial position, the film enters the support block 17 through the feeding port. At this time, the clamping block 20 is subjected to the force of the pull rope 24 and is in an inclined rotation state. The resistance block 23 on the pull rope 24 is connected to the clamping block 20 by a threaded connection, which can facilitate the installation and disassembly work between the structural parts. Even if the structural parts are damaged, it is also convenient for personnel to replace and repair. When the drive motor 4 is started, the pull rope 24 releases the force and is no longer restrained by the clamping block 20. At the same time, it is subjected to the elastic restoring force of the return spring 22 on the first rotating shaft 21. The clamping block 20 rotates downward and clamps the film in position, making it difficult to disengage, which is convenient for subsequent stretching work.

[0029] In addition, the clamping block 20 on the clamping and film-drawing mechanism 3 moves synchronously with the diagonal movement of the second slider 11, so that the clamping block 20 can adaptively adjust the clamping point of the film accordingly. The second swing rod 15 on the fixed block 14 is set to be able to synchronously transmit the force of the moving spacing of the second slider 11 to the clamping block 20. At the same time, the crossbeam 13 contracted and connected on the second slider 11 can play a role of resistance connection for the clamping block 20, so that the clamping block 20 is prevented from position deviation during the translational movement, and at the same time plays a role of positioning and guiding. Moreover, the slot 12 in the second slider 11 is set, which can not only facilitate the horizontal X-axis movement of the crossbeam 13, but also drive the horizontal Y-axis movement of the crossbeam 13. Through the diagonal movement of the second slider 11, it is convenient to perform overall horizontal stretching of the film, rather than horizontal stretching or vertical stretching in a single direction.

[0030] A film-clamping and film-drawing mechanism 3 is provided. When the driving motor 4 is started, the conveyor belt 26 can be used to drive the reel 25 to rotate, thereby transmitting the force to the clamping block 20 through the pull rope 24. At this time, the clamping block 20 keeps free rotation relative to the pull rope 24. Under the action of the return spring 22, the clamping block 20 rotates downward and clamps the film on the support block 17. At the same time, the output shaft of the driving motor 4 can drive the rotation of the turntable 6. Under the rotation connection of the first swing rod 8, the first sliders 7 at the diagonal lines around can be driven to rotate simultaneously. The cross beam 13 can be moved outward, and then the second slider 11 can be pulled to spread and move synchronously. With the second swing rod 15 arranged in a multi-diamond shape, the clamping blocks 20 at multiple positions on the cross beam 13 can also spread and move synchronously, and the cross beam 13 is movably contracted and connected to the notch 12. The notch 12 on the second slider 11 can ensure the relative movement of the cross beam 13 in the horizontal X-axis and Y-axis directions, thereby achieving the purpose of stretching and spreading in any horizontal direction, improving the stretching quality, and having a good clamping and positioning effect, and can adaptively clamp and position the stretching area.

[0031] refer to Figure 1 , Figure 4 , Figure 8 and Fig. 9 An automatic feeding device for a film stretching machine also includes a heating jet mechanism 27, which includes a first bevel gear 28 fixed on the output shaft of a driving motor 4, and both sides of the outer wall of the first bevel gear 28 are meshed with second bevel gears 30 fixed on a second rotating shaft 29. One end of the second rotating shaft 29 is fixed on a cam 31, and the top end of the cam 31 is movably fitted on a lifting plate 33 connected to a compression spring 32, and the compression spring 32 is connected to the side wall of the box body through a top plate 34.

[0032] The output shaft of the drive motor 4 passes through the first bevel gear 28 and extends to the bearing on the inner wall of the box body. The extension sections on both sides of the bearing are installed with guide rings 35 through brackets. The second rotating shaft 29 is movably connected to the guide ring 35, and a guide groove connected to the second rotating shaft 29 is provided in the guide ring 35. The guide ring 35 is installed on the bracket in a detachable manner, and the guide ring 35 is distributed along the length direction of the second rotating shaft 29.

[0033] A gear plate 36 is fixedly installed on one side of the lifting plate 33 away from the inner wall of the box body. The outer wall of the gear plate 36 is meshed with a rotating gear 38 fixed on the third rotating shaft 37. An injection pipe 39 placed in the feeding port is fixedly installed at one end of the third rotating shaft 37. The outer wall edge of the injection pipe 39 is provided with a rotating groove placed on the side wall of the box body. When the driving motor 4 drives the first bevel gear 28 to rotate, it can also drive the second rotating shaft 29 on the second bevel gear 30 to rotate, thereby driving the synchronous rotation of the cam 31. Since one end of the lifting plate 33 is in contact with the cam 31, and the other end is connected to the top plate 34 through a compression spring 32, the spring cooperates with the The elastic restoring force can lift and move the lifting plate 33 back and forth, and at the same time drive the rotating gear 38 on the gear plate 36 to rotate back and forth, and finally the jet pipe 39 on the third rotating shaft 37 can swing at a corresponding angle. Moreover, the corrugated hose 40 for self-inspection of the hot air pump 41 and the jet pipe 39 can ensure the free rotation of the jet pipe 39 at a certain angle by means of the elastic expansion and contraction effect of the corrugated hose 40 itself, so as to spray the hot air flow evenly and effectively onto the film. At the same time, the two ends of the corrugated hose 40 can be connected to the hot air pump 41 and the nozzle 42 by plugging, which can facilitate the installation work of personnel.

[0034] One end of the jet pipe 39 is connected to a hot air pump 41 placed on the outer wall of the box body through a corrugated hose 40, and a nozzle 42 is fixedly installed on the other end. The jet pipe 39 is symmetrically arranged relative to the center of the feeding port. As the drive motor 4 and the hot air pump 41 are started, the gear plate 36 drives the rotating gear 38 to rotate reciprocatingly, and the nozzle 42 sprays the hot air flow evenly onto the film.

[0035] A heating jet mechanism 27 is provided. After the driving motor 4 is started, it can drive the rotation of the first bevel gear 28. Under the action of the gear meshing transmission, the cam 31 on the second rotating shaft 29 is driven to rotate. The cam 31 can convert the rotational force into the linear motion of the lifting plate 33, and under the action of the gear plate 36, the rotating gear 38 is rotated back and forth, and then the jet pipe 39 is rotated synchronously. When the jet pipe 39 rotates, the hot air flow of the hot air pump 41 can be sprayed onto the film evenly and effectively, so as to facilitate the stretching quality in a heating environment. During the spraying process, the particulate impurities on the film can also be removed by the air flow to ensure the cleanliness of its surface and achieve a certain dust removal effect. In addition, in conjunction with the baffle plate 43 on the box body, a relatively closed heating environment can be formed to prevent heat dissipation and improve the product inspection quality.

[0036] refer to Figure 1 and Figure 5 A shielding plate 43 fixed on the pull rod is installed on the operating table 1. As the box moves horizontally on the electric slide rail 2, the feeding port and the shielding plate 43 are closed or opened to each other.

[0037] The bottom of the fixed plate 5 is fixed to the bottom end of the inner wall of the box by a column, and an annular opening connected to the output shaft of the drive motor 4 is provided at the center of the fixed plate 5. This makes it easy for the output shaft of the drive motor 4 to rotate freely, and the first sliders 7 around the diagonal can be moved inward or outward synchronously, thereby driving the clamping and pulling film mechanism 3 to work.

[0038] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0039] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An automatic feeding device for a film stretching machine, characterized in that: include: An operating table (1), wherein a box body with a feeding port is slidably connected to the operating table (1) via an electric slide rail (2); A film clamping and film pulling mechanism (3), the film clamping and film pulling mechanism (3) comprising a driving motor (4) arranged at the center of the bottom end of the inner wall of the box body, the output shaft of the driving motor (4) passing through the fixed disk (5) and extending to the rotating disk (6), the protrusions around the rotating disk (6) and the first slider (7) on the fixed disk (5) are connected by a first swing rod (8), the first slider (7) is connected with a strip groove (9) along the length direction of the fixed disk (5), the strip groove (9) is arranged diagonally, and the extension section at one end of the first slider (7) is fixedly mounted on the second slider (11) by a tilting rod (10); The first swing rod (8) has two ends which are mounted on the protruding portion and the first slider (7) by means of a rotational connection. The second slider (11) has two notches (12) at the corners of the outer wall at both ends. A crossbeam (13) is movably retracted between the notches (12). The fixed blocks (14) on adjacent second sliders (11) are connected by a second swing rod (15). The second swing rod (15) is arranged in a polygonal shape. A movable shaft (16) adapted to the second swing rod (15) is provided at a node of the second swing rod (15). A panel (18) fixed to a support block (17) is installed at the bottom end of the movable shaft (16). One end of the panel (18) is pressed against the crossbeam (13), and a clamping block (20) is installed at the other end via a return elastic component (19).

2. The automatic feeding device for a film stretching machine according to claim 1, characterized in that: The return elastic component (19) comprises a first rotating shaft (21) on the panel (18); a return spring (22) connected to a clamping block (20) is provided on an outer wall edge of the first rotating shaft (21); a clamping cavity is formed between the clamping block (20) and the support block (17); one end of the clamping block (20) is connected to a resistance block (23) located above the first rotating shaft (21); the resistance block (23) is mounted on the clamping block (20) by means of a threaded connection; and one end of the resistance block (23) is mounted on the reel (25) by means of a pull rope (24).

3. The automatic feeding device for a film stretching machine according to claim 2, characterized in that: A through hole connected to the pull rope (24) is provided on the inner wall of the box body, and the reels (25) are distributed around the output shaft of the drive motor (4). The output shaft of the drive motor (4) and the reels (25) are connected by a conveyor belt (26). When the drive motor (4) is started, the reels (25) drive the pull rope (24) to move, and through the pulling action of the resistance block (23), the clamping block (20) connected to the return spring (22) is cooperated, so that the film in the clamping cavity and the clamping block (20) are mutually limited or separated, and at the same time, the second swing rod (15) drives the clamping block (20) to move in all directions or to move toward the center.

4. The automatic feeding device for a film stretching machine according to claim 1, characterized in that: The heating jet mechanism (27) further comprises a first bevel gear (28) fixed on the output shaft of the driving motor (4), the first bevel gear (28) having both sides of an outer wall meshingly engaged with a second bevel gear (30) fixed on a second rotating shaft (29), one end of the second rotating shaft (29) being fixed on a cam (31), the top end of the cam (31) being movably fitted on a lifting plate (33) connected to a compression spring (32), and the compression spring (32) being connected to the side wall of the box body via a top plate (34).

5. The automatic feeding device for a film stretching machine according to claim 4, characterized in that: The output shaft of the drive motor (4) passes through the first bevel gear (28) and extends to a bearing on the inner wall of the housing; guide rings (35) are mounted on the extension sections on both sides of the bearing via brackets; a second rotating shaft (29) is movably connected to the guide ring (35); and a guide groove connected to the second rotating shaft (29) is provided in the guide ring (35).

6. The automatic feeding device for a film stretching machine according to claim 5, characterized in that: The guide ring (35) is detachably mounted on the bracket, and the guide ring (35) is distributed along the length direction of the second rotating shaft (29).

7. The automatic feeding device for a film stretching machine according to claim 4, characterized in that: A gear plate (36) is fixedly mounted on one side of the lifting plate (33) away from the inner wall of the box body, and the outer wall of the gear plate (36) is meshed with a rotating gear (38) fixed on a third rotating shaft (37). An injection pipe (39) disposed in the feeding port is fixedly mounted on one end of the third rotating shaft (37), and a rotating groove disposed on the side wall of the box body is provided on the outer wall edge of the injection pipe (39).

8. The automatic feeding device for a film stretching machine according to claim 7, characterized in that: One end of the jet pipe (39) is connected to a hot air pump (41) disposed on the outer wall of the box body through a corrugated hose (40), and a nozzle (42) is fixedly mounted on the other end. The jet pipe (39) is symmetrically arranged relative to the center of the feeding port. As the driving motor (4) and the hot air pump (41) are started, the gear plate (36) drives the rotating gear (38) to reciprocate, and the nozzle (42) sprays the hot air flow evenly onto the film.

9. An automatic feeding device for a film stretching machine according to any one of claims 1 to 8, characterized in that: The operating table (1) is provided with a shielding plate (43) fixed on a pull rod, and as the box body moves horizontally on the electric slide rail (2), the feeding port and the shielding plate (43) are closed or opened with respect to each other.

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