Needle feeding device for thin film

Abstract

The utility model provides a needle feeding device for a thin film, which relates to the technical field of thin film preparation equipment and at least comprises a base, a needle feeding device and a needle feeding device, the first driving mechanism is mounted on the base and is used for driving a needle plate to move along a preset path; the needle pressing mechanism comprises a support, a linkage rotating shaft and two brush wheels, the support is arranged on a preset path in a crossing mode, the linkage rotating shaft is rotatably installed on the support, the linkage rotating shaft is sleeved with the brush wheels, and the brush wheels synchronously rotate along with the linkage rotating shaft and press the film onto the needle plate; the second driving mechanism is connected with the linkage rotating shaft and drives the linkage rotating shaft to rotate, the first driving mechanism and the second driving mechanism are linked, and the rotation of the brush wheel is synchronous with the movement of the needle plate; and the stretching mechanism is installed on the base and located at the starting end of the preset path, and the stretching mechanism is used for stretching the thin film and pulling the thin film to the position below the brush wheel. According to the needle feeding device for the thin film, the conditions of needle falling, bait tearing and the like during high-temperature stretching of the thin film are effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of film preparation equipment, in particular to a film needle-feeding device. Background Art

[0002] Film is a thin, soft, transparent sheet typically made of plastic, adhesive, rubber, or other materials. The film manufacturing process typically involves multiple steps: low-temperature setting, high-temperature stretching, and heat setting. Low-temperature setting stabilizes the film's initial structure to prevent uncontrolled deformation during subsequent stretching. High-temperature stretching stretches the film at elevated temperatures to induce molecular chain orientation. Heat setting maintains tension at the stretching temperature, eliminating internal stress in the film and locking in the molecular chain orientation.

[0003] Before high-temperature stretching, the film needs to be pressed onto a needle plate to ensure uniform force and prevent slippage during stretching. In the prior art, the needle plate has two rows of needles, and three sets of Teflon discs are used to squeeze the film onto the needle plate. In actual production, this needle-loading step has several drawbacks:

[0004] First, the film is not fully expanded before needle application, and the bait on both sides will shrink when needled, which will lead to problems such as brittle bait and uneven film thickness.

[0005] Secondly, the Teflon discs are not pressed evenly. At the same time, as the middle original sheet deviates and is scratched by the needle, it wears out. If the wear is too great, the needle pressing purpose cannot be achieved, and problems such as needle removal and tearing will occur in the film furnace.

[0006] Secondly, the height of the needle press on the needle plate is not adjustable, and the needle press height cannot be adjusted according to product requirements, which can easily cause problems such as needle tearing;

[0007] Next, the needle pressing wheel is a fixed device and will not rotate in conjunction with the speed of the product, making it difficult to ensure the stability of the needle pressing;

[0008] Finally, the needle wheel and the needle plate cannot be matched synchronously. When adjusting the track width for products of different specifications, the needle wheel cannot be aligned synchronously, affecting the needle pressing effect and bringing unnecessary negative effects.

[0009] In view of this, the inventor has designed a film needle-loading device based on many years of production design experience in this field and related fields and after repeated experiments, in order to solve the problems existing in the prior art. Utility Model Content

[0010] The purpose of the utility model is to provide a needle-loading device for a film, which can effectively reduce the problems of needle falling off in the furnace and bait tearing when the film is stretched at high temperature.

[0011] To achieve the above-mentioned purpose, the present invention provides a film needle-applying device, wherein the film needle-applying device at least comprises:

[0012] a base having a predetermined path;

[0013] a first driving mechanism, mounted on the base and used to drive a needle plate to move along the predetermined path;

[0014] A needle pressing mechanism, comprising a bracket, a linkage shaft, and two brush wheels, wherein the bracket is arranged across the predetermined path, the linkage shaft is rotatably mounted on the bracket, and the two brush wheels are sleeved on the linkage shaft. The brush wheels rotate synchronously with the linkage shaft and press the film onto the needle plate;

[0015] a second driving mechanism connected to the linkage shaft and driving the linkage shaft to rotate, the first driving mechanism and the second driving mechanism are linked, and the rotation of each brush wheel is synchronized with the movement of the needle plate;

[0016] A stretching mechanism is installed on the base and located at the starting end of the predetermined path, and is used for stretching the film and pulling the film to the bottom of the brush wheel.

[0017] The film needle device as described above, wherein the bracket includes a driving component and two swing arms, the two swing arms are symmetrically arranged on both sides of the predetermined path, one end of each swing arm is hinged to the base, and the other end of the swing arm is used to install the linkage shaft, the linkage shaft is horizontally arranged and located above the predetermined path, the two ends of the linkage shaft respectively pass through the two swing arms and rotate with the swing arms, the driving component is hinged to one of the swing arms and drives the swing arm to swing up and down.

[0018] The film needle-applying device as described above, wherein the driving component is a pneumatic piston rod.

[0019] In the above-mentioned film needle-applying device, a pressing switch electrically connected to the driving component is provided on the base, and the pressing switch can control the start and stop of the driving component.

[0020] The film needle-loading device as described above, wherein a limiting device is provided on the base, and the limiting device is used to fix the position of the swing arm.

[0021] The film needle-applying device as described above, wherein the film needle-applying device further comprises a linkage motor, and the linkage motor drives the first drive mechanism and the second drive mechanism simultaneously.

[0022] The film needle-pressing device as described above, wherein the outer edge of the brush wheel is provided with bristles, and the length of the bristles is greater than the length of the pressing needles on the needle plate.

[0023] The film needle-applying device as described above, wherein the bristles are Teflon bristles.

[0024] The film-applying needle device as described above, wherein the stretching mechanism includes at least one group of stretching rollers, the stretching roller group includes a driving roller and a pressing roller arranged in parallel, the driving roller and the pressing roller are arranged perpendicular to the predetermined path, the driving roller and the pressing roller are rotatably mounted on the base, and the pressing roller can move toward or away from the driving roller.

[0025] The film needle-applying device as described above, wherein the stretching mechanism comprises two sets of stretching rollers, and the two sets of stretching rollers are arranged in parallel and at intervals.

[0026] Compared with the prior art, the present invention has the following characteristics and advantages:

[0027] The film needle-applying device proposed in the present invention stretches the film through a stretching mechanism before pressing the needle, allowing the film to be fully unfolded. This ensures that the film entering the film needle-applying device is flat and has stable tension, thereby improving the positioning accuracy of the needle and avoiding deviations in the needle position on the film due to shrinkage or drift of the film. At the same time, maintaining the flatness of the film also ensures that the holes or marks formed by the needle are regular in shape and uniform in size without deformation. In addition, maintaining the flatness of the film can effectively avoid needle pressing failures caused by film wrinkles, significantly reducing the scrap rate. Maintaining the flatness of the film can also reduce the margin reserved to avoid wrinkled areas, thereby improving material utilization.

[0028] The film needle-loading device proposed by the utility model has a brush wheel that rotates synchronously with the movement of the needle plate, which effectively eliminates the relative sliding between the brush wheel and the needle plate, avoids fluctuations in the pressure of the brush wheel on the film, and enables the brush wheel to continuously and evenly press the film onto the needle plate, thereby ensuring that the position of the film at the moment of needle pressing will not shift or jitter, thereby improving the needle pressing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. Furthermore, the shapes and proportional dimensions of the components in the drawings are for illustrative purposes only and are intended to facilitate understanding of the present invention. They are not intended to limit the shapes and proportional dimensions of the components of the present invention. Those skilled in the art, guided by the present invention, may select various possible shapes and proportional dimensions to implement the present invention, depending on the specific circumstances.

[0030] Figure 1This is a structural schematic diagram of the film needle loading device proposed by the utility model.

[0031] Figure 2 This is a schematic structural diagram of the limiting device in the utility model;

[0032] Figure 3 This is a schematic diagram of the installation of the brush wheel and the clip in the utility model.

[0033] Description of Reference Numerals

[0034] 100. Needle-loading device for film; 1. Base; 2. Needle-pressing mechanism; 21. Swing arm; 22. Driving component; 23. Linkage shaft; 24. Brush wheel; 25. Clip; 251. Inner clip; 252. Outer clip; 253. Fixing screw; 5. Stretching mechanism; 51. Driving roller; 52. Pressing roller; 6. Needle plate; 7. Limiting device; 71. Upper spacer; 72. Lower spacer; 73. Flat-head screw; 74. Nut; 8. Pressing switch; 9. Linkage motor. DETAILED DESCRIPTION

[0035] The details of the present invention can be more clearly understood by referring to the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are for the purpose of explaining the present invention only and should not be construed as limiting the present invention in any way. Based on the teachings of the present invention, skilled artisans can conceive of any possible variations based on the present invention, which should be considered to fall within the scope of the present invention.

[0036] like Figures 1 to 3 As shown, the utility model proposes a film needle device 100, which includes at least a base 1, a first driving mechanism, a needle pressing mechanism 2, a second driving mechanism and a stretching mechanism. The base 1 has a predetermined path; the first driving mechanism is mounted on the base 1 and drives a needle plate 6 to move along the predetermined path; the needle pressing mechanism 2 includes a bracket, a linkage shaft 23 and two brush wheels 24, the bracket is arranged across the predetermined path, the linkage shaft 23 is rotatably mounted on the bracket, the two brush wheels 24 are mounted on the linkage shaft 23, the second driving mechanism is connected to the linkage shaft 23 and drives the linkage shaft 23 to rotate, the brush wheel 24 rotates synchronously with the linkage shaft 23 and presses the film onto the needle plate 6, the first driving mechanism and the second driving mechanism are linked, and the rotation of the brush wheel 24 is synchronized with the movement of the needle plate 6; the stretching mechanism is mounted on the base 1 and is located at the starting end of the predetermined path, the stretching mechanism is used to stretch the film and pull the film to the bottom of the brush wheel 24.

[0037] The film needle device 100 proposed by the present invention stretches the film through a stretching mechanism before pressing the needle, so that the film can be fully unfolded, so that the film entering the film needle device 100 is flat and the tension is stable, thereby improving the position accuracy of the needle and avoiding deviation of the needle position on the film due to shrinkage or drift of the film; at the same time, keeping the film flat also ensures that the hole or imprint formed by the needle is regular in shape and uniform in size without deformation. In addition, keeping the film flat can also effectively avoid needle pressing failure caused by film wrinkles, significantly reducing the scrap rate; keeping the film flat can also reduce the margin reserved to avoid wrinkled areas, thereby improving material utilization.

[0038] The needle device 100 for film proposed by the present invention has a brush wheel 24 that rotates synchronously with the movement of the needle plate 6 (that is, the rotation speed of the brush wheel 24 is consistent with the speed of the needle plate 6), which effectively eliminates the relative sliding between the brush wheel 24 and the needle plate 6, avoids the pressure fluctuation of the brush wheel 24 on the film, and enables the brush wheel 24 to continuously and evenly press the film onto the needle plate 6, thereby ensuring that the position of the film at the moment of needle pressing will not shift or jitter, thereby improving the needle pressing quality.

[0039] In an optional embodiment of the present invention, the bracket includes a driving component 22 and two swing arms 21, the two swing arms 21 are symmetrically arranged on both sides of the predetermined path, one end of each swing arm 21 is hinged to the base 1, and the other end of the swing arm 21 is used to install a linkage shaft 23, the linkage shaft 23 is horizontally arranged and located above the predetermined path, the two ends of the linkage shaft 23 respectively pass through the two swing arms 21 and rotate with the swing arms 21, the driving component 22 is hinged to one of the swing arms 21 and drives the swing arm 21 to swing. With the above structure, when the swing arm 21 swings, the linkage shaft 23 approaches the needle plate 6 or moves away from the needle plate 6, and the distance between the brush wheel 24 on the linkage shaft 23 and the needle plate 6 can be adjusted to accommodate needle presses of different heights on the needle plate 6.

[0040] In an optional example of this embodiment, the driving component 22 is a pneumatic piston rod.

[0041] In another optional example of this embodiment, the driving component 22 may also be a hydraulic rod or an electric push rod.

[0042] In an optional example of this embodiment, a press switch 8 electrically connected to the driving component 22 is provided on the base 1, and the start and stop of the driving component 22 can be controlled by the press switch 8.

[0043] In an alternative example of the embodiment, the base 1 is provided with a limiting device 7 for fixing the position of the swing arm 21. Specifically, when the driving component 22 drives the swing arm 21 to a predetermined swing position, the brush wheel 24 has a predetermined distance from the needle plate 6, at which time the limiting device 7 is used to fix the position of the swing arm 21, and thus the distance between the brush wheel 24 and the needle plate 6 is stabilized.

[0044] In an alternative example, the limiting device 7 comprises an upper pad 71, a lower pad 72, a flat head screw 73 and a nut 74. The upper pad 71 is fixedly connected to the swing arm 21, the lower pad 72 is fixedly connected to the base 1, and the flat head screw 73 vertically penetrates the lower pad 72 and the nut 74 and is threadedly engaged with the lower pad 72 and the nut 74. When the swing arm 21 is driven downward by the driving component 22, the flat head of the flat head screw 73 is just abutted against the upper pad 71, and then the flat head screw 73 is lowered or moved upward by clockwise or counterclockwise turning of a corresponding wrench, so that the upper pad 71 is pressed against the flat head and moves up and down, and the swing arm 21 and the brush wheel 24 are correspondingly moved up and down until the film and the needle are adjusted to a suitable height, and finally the nut 74 at the lower end of the flat head screw 73 is tightened to fix the position of the flat head screw 73.

[0045] In an alternative example of the embodiment, the flat head screw 73 is a hexagonal flat head screw, which is turned by a corresponding hexagonal wrench.

[0046] In an alternative example of the embodiment, the compression switch 8 is opened to control the pneumatic piston rod of the driving component 22 by compressed air to synchronously lower the swing arm 21 and the linkage rotating shaft 23 mounted on the swing arm 21.

[0047] In an alternative embodiment of the utility model, the needle plate 6 comprises a needle plate body and a plurality of needles, and each needle is mounted on the needle plate body by a height adjusting mechanism. With the above structure, the height of each needle can be adjusted synchronously according to different film thickness processes to ensure uniform needle pressing.

[0048] In an alternative example of the embodiment, different specifications of films have different thicknesses, and the height of the needle is adjusted according to different specifications, such as 12.5 / 25 / 50 / 75 / 100 / 125 / 150, and the height of the brush wheel 24 is correspondingly adjusted and fixed by the limiting device 7 to ensure the stability of the process of different film specifications.

[0049] In an alternative example, the limiting device 7 can be adjusted in advance after the curing process.

[0050] In another alternative example, the limiting device 7 can be continuously adjusted according to the actual working condition during the process, and is fixed when it is adjusted to a suitable position.

[0051] In an optional embodiment of the present invention, the second drive mechanism and the first drive mechanism are linked to keep the rotation of the brush wheel 24 consistent with the moving speed of the needle plate 6 (production speed), thereby ensuring the stability and uniformity of the needle pressing.

[0052] In an optional example of this embodiment, the first drive mechanism includes a gear-chain mechanism and a main motor. The gear-chain direct drive mechanism transmits the power of the main motor to the needle plate 6 to achieve precise movement of the needle plate 6. The second drive mechanism includes a slave motor and a frequency converter. The slave motor is used to drive the linkage shaft 23 to rotate. The slave motor receives speed instructions from the main motor and dynamically adjusts the speed through the frequency converter to achieve tracking synchronization. The movement speed of the needle plate is the production speed.

[0053] In an optional example, the linkage motor is a servo motor.

[0054] In an optional embodiment of the present invention, the outer edge of the brush wheel 24 is provided with bristles, and the length of the bristles is greater than the height of the pressing needles on the needle plate 6.

[0055] In an optional example of this embodiment, the length of the bristles of the brush wheel 24 is 1 cm longer than the height of the pressing needles.

[0056] Preferably, the length of the bristles is 2 cm and the height of the indenters is 1 cm.

[0057] Preferably, the thickness of the brush wheel 24 is 2 cm.

[0058] In an optional example of this embodiment, the bristles are Teflon bristles, nylon bristles, boar bristles, sisal bristles or wire bristles.

[0059] In an optional embodiment of the present invention, the brush wheel 24 is detachably mounted on the linkage shaft 23 via a clip 25 , and the position of the brush wheel 24 can be changed as the width of the film changes, thereby enabling the brush wheel 24 to accurately press the needle.

[0060] In an optional example of this embodiment, the clip 25 includes an inner clip 251, an outer clip 252 and a plurality of fixing screws 253. The inner clip 251 is mounted on the linkage shaft 23 and is detachably fixedly connected to the linkage shaft 23. The brush wheel 24 and the outer clip 252 are also mounted on the linkage shaft 23. The brush wheel 24 is clamped by the inner clip 251 and the outer clip 252, and the inner clip 251, the brush wheel 24 and the outer clip 252 are fixedly connected together by a plurality of fixing screws 253.

[0061] In an optional example, the brush wheel 24 is made of different materials according to different actual production requirements.

[0062] In an optional example, the fixing screw 253 is a hexagon socket screw. In an optional embodiment of the present invention, the needle plate 6 has two parallel and spaced plates, each plate having a row of needles, and each needle plate 6 is mounted on a guide rail. The base 1 is provided with two slide grooves for mounting the guide rails, the two slide grooves being respectively provided at both ends of the guide rails and perpendicular to the guide rails. The needle plate 6 is mounted on one side of the guide rail, and the other side of the guide rail is mounted in the slide groove. A screw is provided between the two guide rails, and the two ends of the screw have thread segments with opposite thread directions. The two thread segments are respectively engaged with the threads of the two guide rails. The screw is driven to rotate by a motor, and the two guide rails move synchronously in the slide groove through thread engagement, realizing the mutual approach and separation of the two guide rails, thereby realizing the mutual approach and separation of the two rows of needles on the needle plate 6, which can adapt to films of different widths and realize symmetrical stretching of the entire film.

[0063] In an optional example of this embodiment, the clip 25 is made of stainless steel. A PU clip, plastic clip, or carbon steel clip may also be used depending on actual needs. In an optional example of the present invention, the stretching mechanism includes at least one stretching roller assembly, which includes a parallel drive roller 51 and a pressing roller 52. The drive roller 51 and the pressing roller 52 are rotatably mounted on the base 1 and perpendicular to the predetermined path. A gap is formed between the pressing roller 52 and the drive roller 51 for clamping the film.

[0064] In an optional embodiment of the present invention, the drive roller 51 is an active roller directly driven by a motor, providing traction for the film and controlling the overall speed of the production line. The pressing roller 52 is a driven roller, passively rotating due to the friction of the film, guiding, supporting, and changing the direction of the film's movement.

[0065] In an optional example of the present invention, the film is manually pulled to the brush wheel 24 for needle loading, and after the film is pressed onto the needle plate 6, the first drive mechanism and the second drive mechanism are turned on. At this time, all the front and rear parts of the film needle loading device 100 are linked to the same production speed.

[0066] In an optional example of the present invention, the gap between the pressing roller 52 and the driving roller 51 is fixed.

[0067] In an optional example of this embodiment, the stretching mechanism includes two sets of stretching rollers, which are arranged in parallel and spaced apart. The film is stretched by the two sets of stretching rollers, further ensuring the flatness of the film before needle pressing.

[0068] In an optional example of this embodiment, the driving roller 51 and the pressing roller 52 may be stainless steel rollers, PU rollers, ceramic rollers or carbon steel rollers.

[0069] The detailed explanation of the above-mentioned embodiments is only intended to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions cannot be interpreted as limiting the present invention for any reason. In particular, the various features described in different embodiments can also be arbitrarily combined with each other to form other embodiments. Unless there is a clear description to the contrary, these features should be understood as being applicable to any embodiment and are not limited to the described embodiments.

Claims

1. A film needle device, characterized in that: The film needle-applying device at least comprises: a base having a predetermined path; a first driving mechanism, mounted on the base and used to drive a needle plate to move along the predetermined path; A needle pressing mechanism, comprising a bracket, a linkage shaft, and two brush wheels, wherein the bracket is arranged across the predetermined path, the linkage shaft is rotatably mounted on the bracket, and the two brush wheels are sleeved on the linkage shaft. The brush wheels rotate synchronously with the linkage shaft and press the film onto the needle plate; a second driving mechanism connected to the linkage shaft and driving the linkage shaft to rotate, the first driving mechanism and the second driving mechanism are linked, and the rotation of each brush wheel is synchronized with the movement of the needle plate; A stretching mechanism is installed on the base and located at the starting end of the predetermined path, and is used for stretching the film and pulling the film to the bottom of the brush wheel.

2. The film needle-feeding device according to claim 1, wherein: The bracket includes a driving component and two swing arms, the two swing arms are symmetrically arranged on both sides of the predetermined path, one end of each swing arm is hinged to the base, and the other end of the swing arm is used to install the linkage shaft, the linkage shaft is horizontally arranged and located above the predetermined path, the two ends of the linkage shaft respectively pass through the two swing arms and rotate with the swing arms, the driving component is hinged to one of the swing arms and drives the swing arm to swing up and down.

3. The film needle-applying device according to claim 2, wherein: The driving component is a pneumatic piston rod.

4. The film needle-feeding device according to claim 2, wherein: The base is provided with a press switch electrically connected to the driving component, and the press switch can control the start and stop of the driving component.

5. The film needle-feeding device according to claim 2, wherein: A limiting device is provided on the base, and the limiting device is used to fix the position of the swing arm.

6. The film needle-feeding device according to claim 1, wherein: The film needle-applying device further comprises a linkage motor, which drives the first drive mechanism and the second drive mechanism simultaneously.

7. The film needle-feeding device according to claim 1, wherein: The outer edge of the brush wheel is provided with bristles, and the length of the bristles is greater than the length of the pressing needles on the needle plate.

8. The film needle-feeding device according to claim 7, wherein: The bristles are Teflon bristles.

9. The film needle-feeding device according to claim 1, wherein: The stretching mechanism includes at least one stretching roller group, the stretching roller group includes a driving roller and a pressing roller arranged in parallel, the driving roller and the pressing roller are arranged perpendicular to the predetermined path, the driving roller and the pressing roller are rotatably mounted on the base, and the pressing roller can move toward or away from the driving roller.

10. The film needle-applying device according to claim 9, characterized in that: The stretching mechanism comprises two sets of stretching rollers, which are arranged in parallel and at intervals.

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