Film feeding system based on double tension intervals and used for multi-column packaging machine

Abstract

The invention discloses a double-tension-interval-based film feeding system for a multi-column packaging machine, which comprises a paper roll mechanism arranged at the bottom of a rack, and a paper film changing mechanism, a film feeding device, a swing shaft roller tensioning mechanism, a laser coding mechanism, a laser coding position adjusting mechanism and a damping mechanism are sequentially arranged at the downstream of the paper roll mechanism according to the film feeding direction, an encoder alarm device and a mark tracking photoelectric sensor mark position adjusting mechanism are further arranged on the machine frame. During working, the film feeding device pulls out a paper film from a paper film roll of the paper roll mechanism, and the brake shaft is braked by the brake block, so that the paper film forms a first tension interval between the paper roll mechanism and the film feeding device; the damping mechanism is located at the output end of the film feeding system, the paper film is wound in a swing tensioning roller shaft system of the swing shaft roller tensioning mechanism, and the swing tensioning roller shaft system droops under the action of gravity, so that the paper film forms a second tension interval between the film feeding device and the damping mechanism. The film feeding device can be matched with a multi-column packaging machine, can continuously feed films and is stable in tension.

Description

Technical Field

[0001] The present invention relates to a packaging machine, and more particularly to a film feeding system based on double tension intervals for a multi-row packaging machine used in the production of bagged food or medicine packaging machinery. Background Art

[0002] In the existing packaging production machinery and equipment, the servo motor that drives the paper roll to rotate in the film feeding system is directly connected to the air expansion shaft after gear speed change. When the paper roll stops, the motor stops. This paper roll driving motor frequently starts and stops intermittently. Due to the interference of various factors such as inertial buffering, paper film material and plastic deformation, different surface roughness of paper film, different pre-tension of paper film, etc., the tensioning force of the paper feeding mechanism is very unstable during actual use. During the production process, it will affect the flatness of the packaging bag, the stability of the mechanism movement, and cause wrinkles in the packaging bag; local sticking; when multiple rows of packaging bags are packaged synchronously, due to different tensioning forces, the product consistency will inevitably be poor, the positioning will be inaccurate, the pattern will be offset, etc., not only the appearance quality cannot be guaranteed, but in severe cases, there will even be serious quality problems such as leaking bags and bad bags. At the same time, the change of tensioning force also causes displacement during operation. The phenomenon of paper film deviation is also a problem that must be solved in current packaging machinery. After the paper film passes through each roller, the transmission distance is long. Each component is limited by processing factors such as processing difficulty and assembly accuracy. If you want to improve the accuracy to correct the deviation problem, it will undoubtedly cause greater expenditure in manufacturing costs. At present, the paper feeding mechanism of most packaging machinery in the market widely uses the method of correcting the deviation of the paper film by adjusting the position of the paper roll. This correction method not only causes excessive waste of packaging paper film, but also takes time and effort to operate. On the other hand, when replacing and connecting paper film, the operation process is complicated, and it is necessary to re-set the system tension, the coding position of the coding machine, and the position of the photoelectric sensor, etc., which takes too much adjustment time, causing great inconvenience to production and maintenance. With the continuous improvement of market demand, the requirements for equipment output and running stability are gradually increasing. The existing film feeding mechanism can no longer meet the requirements of high speed, high quality and long-term stability of packaging equipment. The packaging speed of the packaging machine has increased, and higher requirements have been put forward for the film supply system. In order to allow the packaging machine to operate continuously, a film feeding system that can continuously supply film and has stable tension must be available to adapt to the host. Summary of the invention

[0003] In view of the above-mentioned prior art, the present invention provides a film feeding system based on dual tension intervals for a multi-column packaging machine. The film feeding system based on dual tension intervals can be adapted to the multi-column packaging machine and can continuously supply film with stable tension.

[0004] In order to solve the above technical problems, the present invention proposes a film feeding system based on double tension intervals for a multi-row packaging machine, comprising a paper rack mechanism, the paper rack mechanism comprises a frame, a paper roll mechanism is provided at the bottom of the frame, and a paper film changing mechanism, a film feeding device, a swing shaft roller tensioning mechanism, a laser coding mechanism, a laser coding position adjustment mechanism and a damping mechanism are provided downstream of the paper roll mechanism in the film feeding direction, and an encoder alarm device and a tracking photoelectric sensor mark position adjustment mechanism are also provided on the frame;

[0005] The paper roll mechanism comprises an air-expanding shaft installed at the bottom of the frame, bearings are installed on both sides of the air-expanding shaft and supported on the side upright plates A and B of the paper rack, a low film alarm sensor is arranged on the inner side of the side upright plate B of the paper rack near the air-expanding shaft, and a film-free alarm sensor is arranged along the direction of the paper film and upstream of the film-free alarm sensor; when the paper film wound on the air-expanding shaft is about to run out, the film-free alarm sensor sends out a film-free alarm signal, and when the paper film is used up, the film-free alarm sensor sends out a film-free signal;

[0006] A paper rack brake device is installed at the bottom of the frame, on the left side of the paper roll mechanism, and the paper rack brake device includes a manual valve, a brake cylinder, a brake shaft, a brake paper rack lever and a brake block. One end of the brake cylinder is fixedly supported on the side vertical plate A of the paper rack, and the cylinder rod at the other end of the brake cylinder is connected to one end of the brake paper rack lever, and the other end of the brake paper rack lever is connected to the brake block. The middle position of the brake paper rack lever is supported on the side vertical plate A of the paper rack. The manual valve controls the extension and retraction of the cylinder rod of the brake cylinder. In the working state, the cylinder rod is extended, and under the action of the brake paper rack lever, the brake block is pressed on the brake shaft to provide resistance for the brake shaft;

[0007] The film feeding device comprises a film feeding motor, a film feeding rubber roller A and a film pressing roller A, and the paper film is located between the film feeding rubber roller A and the film pressing roller A;

[0008] The laser coding mechanism includes a laser coding device, a visual inspection device and a visual position adjustment device. The laser coding device includes a laser baffle, a coding support roller, a coding support plate A and a coding support plate B. The lower part of the coding support plate B is provided with a meter wheel of a laser coding machine. The visual inspection device includes two visual support rollers and a camera support plate. A visual camera is installed on the camera support plate. The visual position adjustment device includes a visual adjustment roller A and two visual adjustment rollers B. Both ends of the visual adjustment roller A are provided with visual adjustment gears. The inner side of the coding support plate A is provided with a visual adjustment rack meshing with the visual adjustment gear.

[0009] The tracking label photoelectric sensor position adjustment mechanism includes a Y-direction displacement control mechanism, on which an X-direction displacement control mechanism is fixed, and on which a tracking label photoelectric sensor is fixed, and the tracking label photoelectric sensor identifies the position of the paper film and provides positioning origin data for the film feeding work of the packaging machine; the Y-direction displacement control mechanism and the X-direction displacement control mechanism both have independent motors, and are driven by independent thread pairs;

[0010] The laser coding position adjustment mechanism includes two fixed rollers and one movable roller arranged on the horizontal bracket, gears are respectively arranged at both ends of the movable roller, a rack meshing with the gears is arranged on the inner side of the horizontal bracket, and notches are arranged at positions corresponding to the two ends of the movable roller on the horizontal bracket, and the two ends of the movable roller slide in the notches under the relative movement of the gear and rack pair.

[0011] When in working state, the film feeding device pulls out the paper film from the paper film roll of the paper roll mechanism. At this time, the brake shaft is braked by the brake block, so that the paper film forms a first tension range between the paper roll mechanism and the film feeding device; the damping mechanism is located at the output end of the film feeding system, and the paper film is wound around the swinging tensioning roller shaft system of the swinging shaft roller tensioning mechanism. Under the action of gravity, the swinging tensioning roller shaft system sags, so that the paper film forms a second tension range between the film feeding device and the damping mechanism.

[0012] Furthermore, the film delivery system of the present invention, wherein:

[0013] The frame includes a horizontal support and a vertical support, the horizontal support is composed of a paper rack cross plate A and a paper rack cross plate B, the vertical support is composed of a paper rack upright plate A, a paper rack upright plate B, a paper rack side upright plate A, a paper rack side upright plate B and two paper rack support shafts; two paper rack long axes are arranged in sequence between the paper rack upright plates A and B along the film feeding direction, an electric cylinder support seat and a correction electric cylinder are arranged on the front upper part of the vertical support, a film connection photoelectric and correction sensors are arranged on the inner side of the paper rack cross plate A along the film feeding direction, a paper rack photoelectric support shaft is arranged on the inner side of the horizontal support, the film connection photoelectric points to the paper film and is used for film connection detection, and the film connection photoelectric can be manually adjusted on the paper rack photoelectric support shaft for axial movement.

[0014] The paper film changing mechanism includes a film changing plate fixed on the bottom of the frame, with a film pressing plate and a roller on the upper and lower sides of the film changing plate respectively, and two film pressing cylinders are fixed to the back sides of both ends of the film changing plate respectively, and the cylinder rods of the two film pressing cylinders extend through four through holes on the film changing plate, and the top ends of the cylinder rods are connected to the film pressing plate; the paper film is supported by two rollers and laid on the film changing plate, and floats between the film changing plate and the film pressing plate, and the retracted state of the cylinder rod of the film pressing cylinder is the state in which the film pressing plate presses the paper film tightly on the film changing plate, and a knife groove is provided in the middle position of the film changing plate.

[0015] The swing shaft roller tensioning mechanism includes a swing tensioning roller shaft system and a fixed support roller shaft system which are installed in the middle of the vertical bracket and arranged in sequence along the direction of the paper film; one end of the swing tensioning roller shaft system extends to the outside of the vertical bracket, and the encoder alarm device includes a follower fixed to the outside of the vertical bracket, an encoder synchronous wheel, a sensor and an encoder, the follower moves with the swing tensioning roller shaft system, and the encoder is linked to the encoder synchronous wheel via a synchronous belt.

[0016] The damping mechanism includes a magnetic powder brake, a film pressing roller B, a film feeding rubber roller B and a film pressing roller wheelbase adjustment mechanism, the pressure between the film pressing roller B and the film feeding rubber roller B is adjusted and maintained by the film pressing roller wheelbase adjustment mechanism; the film pressing roller wheelbase adjustment mechanism includes adjustment devices with the same structure respectively arranged at both ends of the film pressing roller B, the adjustment device includes a lock nut adjustment block sleeved on the axial end of the film pressing roller B, the lock nut adjustment block is provided with a compression spring screw, the compression spring screw is sequentially provided with a compression spring, a lock nut plate and a hollow lock nut stud, the lock nut plate is fixed to the horizontal bracket, the compression spring screw passes through the hollow lock nut stud and is threadedly connected to the lock nut adjustment block, the compression spring between the lock nut adjustment block and the hollow lock nut stud is used to adjust the screw-in depth of the hollow lock nut stud on the lock nut plate, and then adjust the wheelbase between the film pressing roller B and the film feeding rubber roller B, so as to provide the tension of the paper film according to production requirements.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The film feeding system based on double tension intervals for a multi-row packaging machine proposed in the present invention can divide the tensioning force of the paper film in the entire film feeding system into two sections (the film feeding starting stage and the film feeding process stage) for independent control. In the film feeding starting stage, the film feeding servo motor provides initial feeding power. Under the damping action of the paper roll brake device, the paper film obtains stable and uniform tension at this stage, thereby improving the flat stretchability of the paper film. At the same time, the damping is adjustable, the servo motor load is uniform and is not affected by the size of the film roll. The motor output is stable, which increases the service life of the film feeding servo motor and lays a good basic environment for the subsequent film feeding. In the subsequent film feeding process stage, the swing arm of the swing shaft roller moves within a smaller angle area, which is automatically adjusted and set with the operation of the system. In the film feeding process, the motor speed is automatically matched with the paper feeding speed of the packaging machinery during continuous operation. When the movement range is too large and exceeds the set value, the encoder feedback signal is sent to the control system to realize automatic shutdown. At the same time, an alarm for no film or abnormal film supply is also achieved, thereby realizing the tension in the film feeding process stage.

[0019] The paper rack mechanism in the present invention can automatically correct the deviation of the paper film. After the sensor senses the lateral displacement of the paper film (that is, the deviation phenomenon), it feeds back the signal and controls the deviation adjustment motor to operate the dragging mechanism to realize the rapid automatic deviation correction function of the entire paper feeding mechanism. The damping mechanism in the present invention has a simple and compact structure and reliable operation. By adjusting the pressure generated by the compression spring between the hollow hollow lock nut stud and the nut adjustment block, the pressure at both ends of the two shaft rollers is consistent, and the paper film is prevented from being displaced under the action of force, so that the paper film movement is stable and the surface of the paper film is kept flat and wrinkle-free. When replacing paper film parts, debugging or initial setting, it can reduce paper film waste while greatly reducing operation time. While improving production efficiency, high-precision quality assurance is obtained, which greatly increases market demand.

[0020] The film feeding system based on the dual tension interval of the present invention has a reasonable structure, high cost performance, and is easy to install. When the host packaging machine performs continuous production, it can adapt to the host, continuously supply film, dynamically code and detect, and provide basic support for the packaging speed of the high-speed continuous packaging machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the double tension film feeding system of the present invention for a multi-row packaging machine;

[0022] Figure 2-1 yes Figure 1 A side view of the double tension film feeding system shown in FIG. 1 , showing the working path of the paper film;

[0023] Figure 2-2 yes Figure 2-1 A partial view of section A shown in FIG;

[0024] Figure 2-3 yes Figure 2-1 A partial view of part B shown in FIG.

[0025] Figure 3 yes Figure 1 A partial schematic diagram of a paper rack mechanism shown in ;

[0026] Figure 4-1 yes Figure 1 A partial schematic diagram of the paper film changing and paper film feeding mechanism shown in FIG.

[0027] Figure 4-2 yes Figure 4-1 Schematic diagram of the paper stand brake device and paper film detection device of the paper film changing and paper roll mechanism shown;

[0028] Figure 4-3 yes Figure 4-2 a side view of the structure shown;

[0029] Figure 4-4 yes Figure 4-1 The structural schematic diagram of the paper film changing mechanism is shown in;

[0030] Figure 4-5 yes Figure 4-1 The structural schematic diagram of the paper feeding film mechanism shown in ;

[0031] Figure 4-6 yes Figure 4-5 A structural schematic diagram of the paper feeding film mechanism from another perspective;

[0032] Figure 5 yes Figure 1 A structural schematic diagram of the swing shaft roller tensioning mechanism shown in;

[0033] Figure 6-1 yes Figure 1 The structural diagram of the laser coding mechanism shown in FIG.

[0034] Figure 6-2 yes Figure 6-1 A structural schematic diagram of the laser coding mechanism from another perspective;

[0035] Figure 7-1 yes Figure 1 The structural diagram of the marking position adjustment mechanism of the tracking photoelectric sensor shown in ;

[0036] Figure 7-2 yes Figure 7-1 The structural schematic diagram of the Y-direction displacement control mechanism is shown in;

[0037] Figure 7-3 yes Figure 7-1 The structural schematic diagram of the X-axis displacement control mechanism is shown in;

[0038] Figure 8-1 yes Figure 1 The structural schematic diagram of the damping mechanism shown in ;

[0039] Figure 8-2 yes Figure 8-1 A schematic structural diagram of one end of the damping mechanism shown in FIG.

[0040] Figure 8-3 yes Figure 8-1 A structural schematic diagram of a damping wheelbase adjustment mechanism in a damping mechanism shown in FIG.

[0041] Fig. 9 yes Figure 1 The structural schematic diagram of the laser coding position adjustment mechanism is shown in .

[0042] In the figure:

[0043] 1- Paper film changing mechanism 2- Paper roll mechanism 3- Paper rack brake device

[0044] 4-Film feeding device 5-Encoder alarm device 6-Swing shaft tensioning mechanism

[0045] 7-Paper rack mechanism 8-Laser coding mechanism 9-Marking position adjustment machine with tracking photoelectric sensor 10- Damping mechanism 11- Laser coding position adjustment mechanism 1010- Film pressing roller wheelbase adjustment mechanism

[0046] 101-film changing plate 102-film pressing plate 103-roller

[0047] 104-Knife groove

[0048] 201-No film alarm sensor 202-Little film alarm sensor

[0049] 301-manual valve 302-brake cylinder 303-brake shaft

[0050] 304-brake paper holder lever 305-brake block

[0051] 401-film feeding motor 402-film feeding rubber roller A 403-film pressing roller A 601-swing tension roller shaft system 602-fixed support roller shaft system 501-follower

[0052] 502- encoder synchronous wheel 503- sensor 504- encoder

[0053] 701- Paper rack horizontal board A 702- Paper rack horizontal board B 703- Paper rack vertical board A

[0054] 704-Paper rack stand plate B 705-Paper rack side stand plate A 706-Paper rack side stand plate B

[0055] 707- shaft support 708- paper rack long axis 709- electric cylinder support seat

[0056] 710-Deflection correction electric cylinder 711-Paper rack support shaft 712-Deflection correction sensor

[0057] 713-Film-joining photoelectric 714-Paper-mounting photoelectric support shaft 715-Paper-mounting shaft

[0058] 81-Laser coding device 82-Visual position adjustment device 83 Visual inspection device

[0059] 801-Laser baffle802-Coding support roller803-Visual adjustment roller A

[0060] 804-Visual adjustment roller B 805-Meter wheel 806-Visual adjustment gear

[0061] 807- Visual adjustment rack 808- Visual support roller 809- Visual support plate A

[0062] 810- visual camera 811- camera support plate 812- visual support plate B

[0063] 813-Code support board A 814-Code support board B 91-Y displacement control mechanism 92-X displacement control mechanism 901-tracking motor Y

[0064] 902-Tracking screw rod Y 903-Tracking support Y 904-Tracking motor seat Y

[0065] 905-Tracking slider Y 906-Tracking rail Y 910-Tracking motor X

[0066] 911-Tracking Motor Base X 912-Tracking Screw Block Y 913-Tracking Screw Rod X

[0067] 914-Tracing label photoelectric sensor 915-Tracing label screw block X 916-Tracing label support X

[0068] 917-Tracing slider X 918-Tracing rail X 1001-Magnetic powder brake 1002-film pressing roller B 1003-film feeding rubber roller B

[0069] 1011-lock nut adjustment block 1012-lock nut plate 1013-hollow lock nut stud

[0070] 1014-Compression spring screw 1015-Compression spring

[0071] 1101- movable roller 1102- fixed roller 1103- rack

[0072] 1104-Gear DETAILED DESCRIPTION

[0073] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the following embodiments are by no means intended to limit the present invention in any way.

[0074] like Figure 1 As shown, the present invention proposes a film feeding system based on double tension intervals for a multi-row packaging machine, including a paper rack mechanism 7, the paper rack mechanism 7 includes a frame, a paper roll mechanism 2 is provided at the bottom of the frame, and a paper film changing mechanism 1, a film feeding device 4, a swing shaft roller tensioning mechanism 6, a laser coding mechanism 8, a laser coding position adjustment mechanism 11 and a damping mechanism 10 are provided downstream of the paper roll mechanism 2 in the film feeding direction. The frame is also provided with an encoder alarm device 5 and a tracking photoelectric sensor marking position adjustment mechanism 9.

[0075] like Figure 1 , Figure 2-1 and Figure 3 As shown, the frame includes a horizontal support and a vertical support. The horizontal support is composed of a paper rack horizontal plate A701 and a paper rack horizontal plate B702 and a paper rack support shaft 711 and a paper rack shaft 715 arranged therebetween. The vertical support is composed of a paper rack vertical plate A703, a paper rack vertical plate B704, a paper rack side vertical plate A705, a paper rack side vertical plate B706 and two paper rack support shafts 711. There are two paper rack vertical plates A703 and B704 in sequence along the film running direction. There are two long paper rack shafts 708, and linear bearings are arranged on the paper rack stand A703 and the paper rack stand B704. The long paper rack shaft 708 passes through the linear bearings and is fixed on the shaft support 707. The shaft support 707 is connected to the back of the packaging machine. An electric cylinder support seat 709 and a deflection correction electric cylinder 710 are arranged in the middle of the back of the packaging machine (in the front upper part of the vertical support, in the middle of the back of the packaging machine). One end of the deflection correction electric cylinder 710 is hinged on the electric cylinder support 709, and the cylinder rod extending from the other end is connected to the paper rack stand B 704 through a screw. A box-type bearing seat is arranged on the paper rack shaft 715, and the bearing seat is connected to the top of the packaging machine. The extension and retraction of the cylinder rod of the deflection correction electric cylinder 710 can pull the entire frame to move left and right relative to the packaging machine main body. The inner side of the paper rack horizontal plate A701 is provided with a film receiving photoelectric sensor 713 and a deflection correction sensor 712 (such as Figure 2-2 and Figure 2-3 As shown), the deviation correction sensor 712 is fixed to the packaging machine and has no fixed relationship with the relative position of the paper rack. During the paper film conveying process, its edge is in the sensing area of ​​the sensor. Figure 3It can be seen that the deflection correction electric cylinder 710 is fixed on the packaging machine by the electric cylinder support seat 709. The connection between the deflection correction electric cylinder 710 and the electric cylinder support seat 709 is a hinge type connection. The extended end of the electric cylinder cylinder rod is connected to a long screw rod. The other end of the long screw rod is connected to the paper rack and fastened by a nut. The edge of the paper film passes through the detection probe position of the deflection correction sensor 712. When the deflection correction sensor 712 detects that the paper film is deflected, the deflection correction sensor 712 sends a signal to control the deflection correction electric cylinder 710 to move. The cylinder rod of the deflection correction electric cylinder 710 extends or retracts the corresponding fine-tuning distance. The entire paper rack is reversely offset under the guidance of the linear bearing to compensate for the position, so as to realize the automatic adjustment of the deflection of the paper film and ensure that the position of the paper film is always in a state of precise positioning. The inner side of the horizontal bracket is provided with a paper rack photoelectric support shaft 714. The film connection photoelectric 713 points to the paper film for film connection detection. The film connection photoelectric 713 can be manually adjusted on the paper rack photoelectric support shaft 714. The axial movement. Fix it manually and identify the position of the tape.

[0076] The paper film changing mechanism 1 comprises a film changing plate 101 fixed at the bottom of the frame, and a film pressing plate 102 and a roller 103 are respectively arranged on the upper and lower sides of the film changing plate 101, and two film pressing cylinders are respectively fixed to the back sides of both ends of the film changing plate 101, and the cylinder rods of the two film pressing cylinders extend through four through holes on the film changing plate 101, and the top ends of the cylinder rods are connected to the film pressing plate 102; the paper film is supported by two rollers 103 and laid on the film changing plate 101, and floats between the film changing plate 101 and the film pressing plate 102, and the retracted state of the cylinder rod of the film pressing cylinder is the state in which the film pressing plate 102 presses the paper film tightly on the film changing plate 101, and a thin narrow groove is arranged in the middle position of the film changing plate 101, which is a knife groove 104 for cutting the paper film by a blade, such as Figure 4-1 and Figure 4-4 shown.

[0077] The paper roll mechanism 2 is mounted at the bottom of the entire film feeding system. Figure 1 and Figure 2-1 As shown, the paper film is rolled up on the paper roll mechanism 2, according to Figure 2-1 The paper roll mechanism 2 includes an air-inflated shaft installed at the bottom of the frame, and bearings are installed on both sides of the air-inflated shaft to support it on the side uprights A705 and B706 of the paper rack for positioning and rotation. Figure 4-1 , Figure 4-2 and Figure 4-3 shown.

[0078] like Figure 1 and Figure 4-2As shown, a paper frame brake device 3 is installed at the bottom of the frame and on the left side of the paper roll mechanism 2. The paper frame brake device 3 includes a manual valve 301, a brake cylinder 302, a brake shaft 303, a brake paper frame lever 304 and a brake block 305. One end of the brake cylinder 302 is fixedly supported on the side stand A705 of the paper frame, and the cylinder rod at the other end of the brake cylinder 302 is connected to one end of the brake paper frame lever 304. The other end of the brake paper frame lever 304 is connected to the brake block 305. The middle position of the brake paper frame lever 304 is supported on the side stand A705 of the paper frame. The manual valve 301 controls the extension and retraction of the cylinder rod of the brake cylinder 302. When the cylinder rod is extended, under the action of the brake paper frame lever 304, the brake block 305 presses on the brake shaft 303 to provide resistance for the brake shaft 303. In the working state, the brake block 305 is always pressed against the brake shaft 303. On the inner side of the paper rack side vertical plate B706, a low film alarm sensor 202 is arranged near the air expansion shaft (i.e., the axis of the paper film roll), and a film-free alarm sensor 201 is arranged between the paper film roll and the roller, along the direction of the paper film (working path) and upstream of the low film alarm sensor 202. When the paper film wound on the air expansion shaft is about to run out, the low film alarm sensor 202 sends a low film alarm signal to the controller, and when the paper film is used up, the film-free alarm sensor 201 sends a film-free signal to the controller.

[0079] like Figure 4-1 , Figure 4-2 and Figure 4-3 As shown. When the film needs to be connected or replaced, the brake block 305 is disengaged from the brake shaft 303, and the paper roll mechanism 2 can rotate freely. When connecting or replacing the film, the film pressing cylinder is at the origin position, and the cylinder rod of the film pressing cylinder is extended. The cylinder rod of the film pressing cylinder is retracted by the control button, and the paper film is pressed against the film changing plate 101 by the film pressing block 102. The operator cuts the paper film along the knife groove 104 in a standardized manner, replaces the new film, and glues the new paper film. As shown in Figure 4, after replacing the paper film, the control button makes the new paper film flat on the film changing plate 101, and the glue connection makes it flat. The control button extends the piston of the film pressing cylinder, lifts the film pressing block 102, rotates the film feeding motor 401, tightens the paper film, and the film changing work is completed.

[0080] like Figure 4-5 and Figure 4-6 As shown, the film feeding device 4 includes a film feeding motor 401, a film feeding rubber roller A402 and a film pressing roller A403, and the paper film is located between the film feeding rubber roller A402 and the film pressing roller A403. The two axial ends of the film pressing roller A403 are fixed on the lock nut adjustment block 1011 of the film pressing roller wheelbase adjustment mechanism 1010 (see Figure 8-2). The distance between the film pressing rollers is adjusted, the paper film is pressed, and the film feeding motor 401 is started to pull the paper film. During operation, the brake shaft 303 is braked by the brake block 305, and the paper film is pulled out of the paper film roll, so that there is a certain tension between the film feeding device 4 and the paper roll mechanism 2, thereby forming a tension range.

[0081] like Figure 1 and Figure 2-1 As shown, the swing shaft roller tensioning mechanism 6 is located in the middle of the frame mechanism, and the encoder alarm device 5 is arranged on the outside of the paper rack stand A703. Figure 5 As shown, the swing shaft roller tensioning mechanism 6 includes a swing tensioning roller shaft system 601 and a fixed support roller shaft system 602 which are installed in the middle of the vertical support and arranged in sequence along the direction of the paper film. The fixed support roller shaft system 602 is fixed to the paper rack mechanism 7 through a threaded connection. The two ends of the swing tensioning roller shaft system 601 are positioned on the paper rack mechanism 7 through two shaft support seats, and are mounted on the paper rack stand plate A703 and the paper rack stand plate B704 and can swing up and down. One end of the swing tensioning roller shaft system 601 extends out of the outside of the vertical support. The encoder alarm device 5 includes a follower 501 fixed to the outside of the vertical support, an encoder synchronous wheel 502, a sensor 503 and an encoder 504. The follower 501 moves with the swing tensioning roller shaft system 601. One end of the swing tensioning roller shaft system 601 extends from the paper rack stand plate A703 and is connected to the follower 501. The follower 501 swings up and down synchronously. The up and down swing angle of the swing tension roller shaft system 601 is determined by the encoder synchronous wheel 502 at the end, and the encoder 504 and the synchronous wheel 502 are linked by a synchronous belt.

[0082] like Figure 1 and Figure 6-1 As shown, the laser coding mechanism 8 is located in the upper middle of the paper rack mechanism 7, fixed on the paper rack stand plate A703 and the paper rack stand plate B704 of the paper rack mechanism 7, and exposed outside the rack. Figure 6-1 and Figure 6-2As shown, the laser coding mechanism 8 includes a laser coding device 81, a visual inspection device 83 and a visual position adjustment device 82. The laser coding device 81 includes a laser baffle 801, a coding support roller 802, a coding support plate A813 and a coding support plate B814. The laser baffle 801 is arranged facing the direction of the laser coding machine lens, and both ends are fixed on the coding support plate A813. Two coding support rollers 802 are respectively arranged on the upper and lower sides of the laser baffle 801, and the paper film is laid flat on the laser baffle 801 through the coding support roller 802. There is a long groove on the coding support plate B814, and the entire laser coding device 81 can move forward and backward, and the position of the laser baffle 801 can be adjusted within the focal length of the laser coding machine lens. The visual inspection device 83 is fixed to the inner side of the coding support plate B814 and above the laser coding device 81 via the visual support plate B812. The visual inspection device 83 includes two visual support rollers 808 and a camera support plate 811. A visual camera 810 is installed on the camera support plate 811. The visual support plate A809 is arranged facing the direction of the lens of the visual camera 810 and fixed on the visual support plate B812 at both ends. The camera support plate 811 is fixed on the visual support plate B812. There are multiple sets of screw holes on the visual support plate B812, and there are long grooves in the front-to-back direction on the camera support plate 811, which can adjust the position of the visual support plate A809 within the focal length of the lens of the visual camera 810. There are long grooves in the left-right direction on the camera support plate 811, which can adjust the left-right position of the visual camera 810. The visual position adjustment device 82 is arranged between the laser coding device 81 and the visual inspection device 83. The visual position adjustment device 82 includes a visual adjustment roller A803 and two visual adjustment rollers B804. The two ends of the visual adjustment roller A803 are provided with visual adjustment gears 806. The inner side of the coding support plate A813 is provided with a visual adjustment rack 807 meshing with the visual adjustment gear 806. The visual adjustment gear 806 and the meshing visual adjustment rack 807 are located at the two visual adjustment rollers B804. Between the adjustment rollers B804, there is a long groove on the outer side of the gear of the coding support plate B814. Cam knobs (hand-twisted) are installed at both ends of the visual adjustment roller A803. When adjusting, the visual adjustment roller A803 drives the visual adjustment gear 806 to roll and mesh on the meshing visual adjustment rack 807 by hand-twisting the cam knob, and the position of the detected code (the result of laser coding) on ​​the visual support plate A809 is adjusted forward and backward. The code enters the camera range of the visual camera 810 lens, and the cam knob is tightened to fix the position. The lower part of the coding support plate B814 is provided with a meter wheel 805 (laser coding machine accessory) of the laser coding machine. The meter wheel 805 contacts the coding support roller 802, and the meter wheel encoder sends a signal to the controller of the laser coding machine to ensure the dynamic coding function of the laser coding machine.

[0083] like Figure 1 As shown, the tracking photoelectric sensor position adjustment mechanism 9 is located in the middle of the upper part of the paper rack. Figure 7-1 As shown, the tracking photoelectric sensor position adjustment mechanism 9 includes a Y-direction displacement control mechanism 91, and an X-direction displacement control mechanism 92 is fixed on the Y-direction displacement control mechanism 91. Figure 7-2 and Figure 7-3 As shown, the X-direction displacement control mechanism 92 is fixed with a tracking photoelectric sensor 914, which can be moved horizontally in the X direction; the X-direction displacement control mechanism 92 is fixed on the Y-direction displacement control mechanism 91, which can be moved vertically; both displacement mechanisms have independent motors that are driven by screw and nut pairs. The tracking photoelectric sensor 914 identifies the position of the paper film and provides positioning origin data for the film feeding work of the packaging machine; the Y-direction displacement control mechanism 91 and the X-direction displacement control mechanism 92 both have independent motors and are driven by their own independent thread pairs.

[0084] The specific structures of the X-direction displacement control mechanism 92 and the Y-direction displacement control mechanism 91 are as follows:

[0085] like Figure 7-3 As shown, the X-axis displacement control mechanism 92 includes a tracking mark support X916, and a tracking mark motor X910 is arranged outside the tracking mark support X916, and the tracking mark motor X910 is located below the tracking mark screw block Y912 fixedly connected to the tracking mark support X916. The output end of the tracking mark motor X910 is connected to the tracking mark screw X913 through gear transmission, and the two ends of the tracking mark screw X913 are provided with bearings, which can be supported and rotated on the tracking mark support X916, and the tracking mark screw block X915 is installed on the tracking mark screw X913, and the bottom of the tracking mark screw block X915 is fixedly connected to the tracking mark slider X917, and the bottom of the tracking mark support X916 is fixed with a tracking mark slide rail X918 parallel to the tracking mark screw rod X913, and the tracking mark screw rod X913 rotates to drive the tracking mark screw block X915 to move horizontally left and right along the X axis under the guidance of the guide rail slider pair. The tracking photoelectric sensor (photoelectric sensor) 914 is fixed on the tracking screw block X915 and moves synchronously with the tracking screw block X915.

[0086] like Figure 7-2As shown, the Y-axis displacement control mechanism 91 includes a tracking support Y903 fixed on the outer side of the paper rack cross plate A701 and a tracking screw Y912 arranged on the tracking support X916; the outer side of the tracking support Y903 is installed with a tracking motor Y901 via a tracking motor seat Y904, the output end of the tracking motor Y901 is connected with a tracking screw Y902, the tracking screw Y902 cooperates with the tracking screw Y912, the two ends of the tracking screw Y902 are provided with bearings, can be supported and rotated on the tracking support Y903, the tracking support Y903 is fixed with a tracking slide rail Y906 parallel to the tracking screw Y902, the tracking slide rail Y906 is provided with a tracking slider Y905, and the tracking slider Y905 is fixed to the tracking support X916.

[0087] The tracking screw X913 and the tracking screw Y902 are arranged in a mutually perpendicular direction. The mounting hole of the X-direction displacement control mechanism 92 is arranged on the horizontal plate A701 of the paper rack. The tracking photoelectric sensor (photoelectric sensor) 914 is located at the edge of the paper film. The tracking photoelectric sensor (photoelectric sensor) 914 can achieve the X-direction left and right displacement and the Y-direction forward and backward displacement; the mounting hole is also arranged on the horizontal plate B702 of the paper rack. When the user sets the packaging material paper film cursor on the other side, a mirror mechanism can be used to match.

[0088] The X-direction displacement control mechanism 92 moves along the Y-axis on the Y-direction displacement control mechanism 91, and the tracking screw block X915 on the X-direction displacement control mechanism 92 moves along the tracking screw rod X913, and the tracking photoelectric sensor 914 fixed to the tracking screw block X915 can achieve accurate positioning in the XY direction. The positioning mark point on the paper film for the horizontal sealing origin position is related to the specifications of the product, and the Y-direction displacement control mechanism 91 and the X-direction displacement control mechanism 92 cooperate with each other to make the tracking photoelectric sensor 914 point to the positioning mark point.

[0089] like Figure 1 As shown, the laser coding position adjustment mechanism 11 is located on the upper part of the paper rack mechanism 7. Fig. 9As shown, the laser coding position adjustment mechanism 11 includes two fixed rollers 1102 and a movable roller 1101 arranged on the horizontal bracket, and gears 1104 are respectively arranged at both ends of the movable roller 1101. A rack 1103 meshing with the gear 1104 is arranged on the inner side of the horizontal bracket, and long slots are arranged at positions corresponding to the two ends of the movable roller 1101 on the horizontal bracket. Under the relative movement of the gear and rack pair, the two ends of the movable roller 1101 slide in the long slots. Cam knobs (hand twist) are installed at both ends of the movable roller 1101. When adjusting, twist the cam knob to make the gear 1104 rolling and meshing on the rack 1103, adjust the length of the paper film forward and backward so that the laser coding machine lens is facing the code mark position on the paper film, and tighten the cam knob to fix the position. Fig. 9 As shown, the film-connecting photoelectric device 713 arranged on the inner side of the paper-connecting rack horizontal plate A701 and the paper-connecting photoelectric support shaft 714 arranged on the inner side of the horizontal bracket are located at the rear of the laser coding position adjustment mechanism 11, and the film-connecting photoelectric device 713 points to the color mark point of the paper film, and the film-connecting photoelectric device 713 can move left and right on the paper-connecting photoelectric support shaft 714 for film-connecting detection.

[0090] like Figure 1 and Figure 2-1 As shown, the damping mechanism 10 is disposed between the paper rack horizontal plate A701 and the paper rack horizontal plate B702 and is located at the terminal of the film feeding system of the present invention. Figure 8-1 , Figure 8-2 and Figure 8-3As shown, the damping mechanism 10 includes a magnetic powder brake 1001, a film pressing roller B1002, a film feeding rubber roller B1003 and a film pressing roller wheelbase adjustment mechanism 1010. The pressure between the film pressing roller B1002 and the film feeding rubber roller B1003 is adjusted and maintained by the film pressing roller wheelbase adjustment mechanism 1010. The film pressing roller wheelbase adjustment mechanism 1010 includes adjustment devices with the same structure respectively arranged at both ends of the film pressing roller B1002, and the adjustment device includes a sleeve on the axis of the film pressing roller B1002. The lock nut adjustment block 1011 at the end has slots on the edges of the paper rack cross plate A701 and the paper rack cross plate B702, and the lock nut adjustment block 1011 is provided with a shallow groove that snaps together with the paper rack cross plate, and the lock nut adjustment block 1011 can slide along the slot of the paper rack cross plate, and there is a through hole in the middle of the lock nut adjustment block 1011, and the axial end of the film pressing roller B1002 is locked in the through hole of the lock nut adjustment block 1011; the axial end of the film feeding rubber roller B1003 is provided with a bearing, which can make it fixedly supported between the paper rack cross plate A701 and the paper rack cross plate B702 and rotate. The lock nut adjustment block 1101 is provided with a compression spring screw 1014, and the compression spring screw 1014 is sequentially provided with a compression spring 1015, a lock nut plate 1012 and a hollow lock nut stud 1013. The lock nut plate 1012 is fixed to the horizontal bracket, and the compression spring screw 1014 passes through the hollow lock nut stud 1013 and is threadedly connected to the lock nut adjustment block 1011. The compression spring 1015 between the lock nut adjustment block 1011 and the hollow lock nut stud 1013 is used to adjust the screw-in depth of the hollow lock nut stud 1013 in the lock nut plate 1012, thereby adjusting the wheelbase between the film pressing roller B1002 and the film feeding rubber roller B1003 (the smaller the distance, the tighter the film pressing, and the greater the film pulling force required during the production of the packaging machine main unit), thereby providing the pulling force of the paper film according to production requirements. In the main system of the packaging machine, the damping value set by the PLC is realized by the magnetic powder brake 1001. When the film pulling force required by the main system exceeds the set value, the paper film can be pulled. The distance between the two axes of the film pressing roller B1002 and the film feeding rubber roller B1003 is adjusted and maintained by the film pressing roller wheelbase adjustment mechanism.

[0091] In the film feeding system of the present invention, the film feeding device 4 pulls out the paper film from the paper film roll of the paper roll mechanism 2. At this time, the brake shaft 303 is braked by the brake block 305, so that the paper film forms a first tension range between the paper roll mechanism 2 and the film feeding device 4; the damping mechanism 10 is located at the output end of the film feeding system, and the paper film is wound by the swing shaft roller tensioning mechanism 6 so that the swing tensioning roller shaft system 601 sags under the action of gravity, so that the paper film forms a second tension range between the film feeding device 4 and the damping mechanism 10; when the swing tensioning roller shaft system 601 moves slightly up and down within a predetermined range due to the pulling force at the output end of the paper film, the tension of this section of the paper film is kept relatively stable due to its own weight. During operation, when the tension changes, that is, the paper roll feeding state changes, such as when the paper film is exhausted and needs to be replaced, the swing range of the swing tension roller shaft system 601 will exceed the predetermined swing range, and the follower 501 synchronously connected by the swing tension roller shaft system 601 will exceed the sensing range, and the encoder 504 will send a signal to the controller and alarm, and the film feeding motor 401 will be synchronously stopped. In this way, the tension of the entire paper feeding system is guaranteed at both locations.

[0092] When splicing or changing the film, the brake block 305 is disengaged from the brake shaft 303, and the paper roll mechanism 2 can rotate freely. When splicing or changing the film, the film pressing cylinder is at the origin position, and the cylinder rod of the film pressing cylinder is in an extended state. By operating the button to retract the cylinder rod of the film pressing cylinder, the film is pressed tightly on the film changing plate 101 by the film pressing block 102. The operator cuts the film along the film cutting groove in a standardized manner, replaces the new film, and glues the new film. Figure 4-1 and Figure 4-2 As shown, after replacing the paper film, the control button makes the new paper film flat on the film changing plate 101, and the film is glued and connected to make it flat. The control button makes the piston of the film pressing cylinder extend, the film pressing block 102 is lifted, the film feeding motor 401 rotates, the paper film is tightened, and the film changing work is completed.

[0093] Although the present invention has been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can make many improvements and changes without departing from the purpose of the present invention, which are all within the protection of the present invention.

Claims

1. A film feeding system based on a double tension zone for a multi-row packaging machine, comprising a paper rack mechanism (7), wherein the paper rack mechanism (7) comprises a frame, and a paper roll mechanism (2) is provided at the bottom of the frame, characterized in that: Downstream of the paper roll mechanism (2), a paper film changing mechanism (1), a film feeding device (4), a swing shaft roller tensioning mechanism (6), a laser coding mechanism (8), a laser coding position adjustment mechanism (11) and a damping mechanism (10) are provided in sequence according to the film feeding direction. The frame is also provided with an encoder alarm device (5) and a tracking photoelectric sensor marking position adjustment mechanism (9); The paper roll mechanism (2) comprises an air-expanding shaft installed at the bottom of the frame, bearings are installed on both sides of the air-expanding shaft and supported on the side upright plate A (705) and the side upright plate B (706) of the paper rack, a low film alarm sensor (202) is arranged on the inner side of the side upright plate B (706) of the paper rack near the air-expanding shaft, and a film-free alarm sensor (201) is arranged along the direction of the paper film and upstream of the film-free alarm sensor (202); when the paper film wound on the air-expanding shaft is about to run out, the film-free alarm sensor (202) sends out a film-free alarm signal, and when the paper film is used up, the film-free alarm sensor (201) sends out a film-free signal; A paper rack brake device (3) is installed at the bottom of the frame, located on the left side of the paper roll mechanism (2), and the paper rack brake device (3) includes a manual valve (301), a brake cylinder (302), a brake shaft (303), a brake paper rack lever (304) and a brake block (305). One end of the brake cylinder (302) is fixedly supported on the side vertical plate A (705) of the paper rack, and the cylinder rod at the other end of the brake cylinder (302) is connected to one end of the brake paper rack lever (304). The other end of the paper rack lever (304) is connected to the brake block (305), and the middle position of the brake paper rack lever (304) is supported on the side vertical plate A (705) of the paper rack. The manual valve (301) controls the extension and retraction of the cylinder rod of the brake cylinder (302). In the working state, the cylinder rod is extended, and under the action of the brake paper rack lever (304), the brake block (305) is pressed on the brake shaft (303) to provide resistance for the brake shaft (303); The film feeding device (4) comprises a film feeding motor (401), a film feeding rubber roller A (402) and a film pressing roller A (403), and the paper film is located between the film feeding rubber roller A (402) and the film pressing roller A (403); The laser coding mechanism (8) comprises a laser coding device (81), a visual inspection device (83) and a visual position adjustment device (82); the laser coding device (81) comprises a laser baffle (801), a coding support roller (802), a coding support plate A (813) and a coding support plate B (814); a meter wheel (805) of the laser coding machine is arranged at the bottom of the coding support plate B (814); the visual inspection device (83) comprises two visual support rollers ( 808) and a camera support plate (811), wherein a visual camera (810) is mounted on the camera support plate (811), the visual position adjustment device (82) comprises a visual adjustment roller A (803) and two visual adjustment rollers B (804), both ends of the visual adjustment roller A (803) are provided with visual adjustment gears (806), and the inner side of the coding support plate A (813) is provided with a visual adjustment rack (807) meshing with the visual adjustment gear (806); The tracking photoelectric sensor position adjustment mechanism (9) comprises a Y-direction displacement control mechanism (91), an X-direction displacement control mechanism (92) is fixed on the Y-direction displacement control mechanism (91), a tracking photoelectric sensor (914) is fixed on the X-direction displacement control mechanism (92), and the tracking photoelectric sensor (914) identifies the position of the paper film and provides positioning origin data for the film feeding work of the packaging machine; the Y-direction displacement control mechanism (91) and the X-direction displacement control mechanism (92) both have independent motors and are driven by independent thread pairs; The laser coding position adjustment mechanism (11) comprises two fixed rollers (1102) and a movable roller (1101) arranged on the horizontal bracket, two ends of the movable roller (1101) are respectively provided with gears (1104), a rack (1103) meshing with the gear (1104) is provided on the inner side of the horizontal bracket, and notches are provided at positions on the horizontal bracket corresponding to the two ends of the movable roller (1101), and under the relative movement of the gear and rack pair, the two ends of the movable roller (1101) slide in the notches; When in working state, the film feeding device pulls out the paper film from the paper film roll of the paper roll mechanism (2). At this time, the brake shaft (303) is braked by the brake block (305), so that the paper film forms a first tension range between the paper roll mechanism (2) and the film feeding device (4); the damping mechanism (10) is located at the output end of the film feeding system, and the paper film is wound in the swing tensioning roller shaft system (601) of the swing shaft roller tensioning mechanism (6). Under the action of gravity, the swing tensioning roller shaft system sags, so that the paper film forms a second tension range between the film feeding device (4) and the damping mechanism (10).

2. The film feeding system based on double tension intervals according to claim 1 is characterized in that: The frame comprises a horizontal support and a vertical support, wherein the horizontal support is composed of a paper rack horizontal plate A (701) and a paper rack horizontal plate B (702), and the vertical support is composed of a paper rack vertical plate A (703), a paper rack vertical plate B (704), a paper rack side vertical plate A (705), a paper rack side vertical plate B (706) and two paper rack support shafts (711); two paper rack long shafts (711) are arranged in sequence between the paper rack vertical plate A (703) and the paper rack vertical plate B (704) along the film running direction. 08), an electric cylinder support seat (709) and a deviation correction electric cylinder (710) are provided on the upper front of the vertical bracket, a film connection photoelectric (713) and a deviation correction sensor (712) are provided on the inner side of the paper rack cross plate A (701) along the film feeding direction, and a paper rack photoelectric support shaft (714) is provided on the inner side of the horizontal bracket, the film connection photoelectric (713) points to the paper film and is used for film connection detection, and the film connection photoelectric (713) can be manually adjusted on the paper rack photoelectric support shaft (714) for axial movement.

3. The film feeding system based on double tension intervals according to claim 1 is characterized in that: The paper film changing mechanism (1) comprises a film changing plate (101) fixed at the bottom of a frame, and a film pressing plate (102) and a roller (103) are respectively provided on the upper and lower sides of the film changing plate (101); two film pressing cylinders are respectively fixed to the back sides of both ends of the film changing plate (101); the cylinder rods of the two film pressing cylinders extend through four through holes on the film changing plate (101), and the top ends of the cylinder rods are connected to the film pressing plate (102); the paper film is supported by the two rollers (103) and laid on the film changing plate (101), and floats between the film changing plate (101) and the film pressing plate (102); the retracted state of the cylinder rod of the film pressing cylinder is the state in which the film pressing plate (102) presses the paper film onto the film changing plate (101); and a knife groove (104) is provided in the middle of the film changing plate (101).

4. The film feeding system based on double tension intervals according to claim 1 is characterized in that: The swing shaft roller tensioning mechanism (6) comprises a swing tensioning roller shaft system (601) and a fixed support roller shaft system (602) which are installed in the middle of the vertical support and arranged in sequence along the direction of the paper film, and one end of the swing tensioning roller shaft system (601) extends to the outside of the vertical support; the encoder alarm device (5) comprises a follower (501) fixed to the outside of the vertical support, an encoder synchronous wheel (502), a sensor (503) and an encoder (504), the follower (501) moves with the swing tensioning roller shaft system (601), and the encoder (504) and the encoder synchronous wheel (502) are linked via a synchronous belt.

5. The film feeding system based on double tension intervals according to claim 1 is characterized in that: The damping mechanism (10) comprises a magnetic powder brake (1001), a film pressing roller B (1002), a film feeding rubber roller B (1003) and a film pressing roller wheelbase adjustment mechanism (1010); the pressure between the film pressing roller B (1002) and the film feeding rubber roller B (1003) is adjusted and maintained by the film pressing roller wheelbase adjustment mechanism (1010); the film pressing roller wheelbase adjustment mechanism (1010) comprises adjustment devices of the same structure respectively arranged at two ends of the film pressing roller B (1002); the adjustment device comprises a lock nut adjustment block (1011) sleeved on the axial end of the film pressing roller B (1002); the lock nut adjustment block (1101) is provided with a compression spring screw (1014); the compression spring A compression spring (1015), a lock nut plate (1012) and a hollow lock nut stud (1013) are sequentially arranged on the screw rod (1014); the lock nut plate (1012) is fixed to the horizontal bracket; the compression spring screw rod (1014) passes through the hollow lock nut stud (1013) and is threadedly connected to the lock nut adjustment block (1011); the compression spring (1015) between the lock nut adjustment block (1011) and the hollow lock nut stud (1013) is used to adjust the screwing depth of the hollow lock nut stud (1013) into the lock nut plate (1012), thereby adjusting the wheelbase between the film pressing roller B (1002) and the film feeding rubber roller B (1003), thereby providing the tension of the paper film according to production requirements.

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