Magnetic control closing device for film

Abstract

This invention discloses a magnetically controlled clamping device for transverse stretching of a thin film, comprising a mounting plate, a magnetic control assembly mounted on the mounting plate, a bracket mounted at the bottom of the mounting plate, and a push plate mounted on the bracket. The magnetic control assembly is used to drive the clamp handle of the chain clip to rotate through magnetic force to achieve clamping. The magnetically controlled clamping device provided by this invention, by setting a push plate next to the magnetic control assembly, allows the chain handle to rigidly contact the push plate when some chain clips fail to clamp due to insufficient magnetic attraction or excessive rotational resistance. Then, the chain handle rotates gradually in the clamping direction under the push plate's push, clamping the film between the clamping surface of the handle and the clamping opening of the clip body, ensuring successful clamping of each chain clip and smooth stretching of the film.

Description

Technical Field

[0001] This invention relates to the field of film stretching production line technology, and in particular to a magnetically controlled clamping device for transverse film stretching. Background Technology

[0002] Chain clamps are widely used in film stretching production lines. These chain clamps are mounted on annular guide rails and are guided during movement. There are two symmetrical annular guide rails on either side of the film, and the chain clamps on both sides move synchronously. The film sheet to be stretched is fed into the chain clamps from both sides. The chain clamps close, and the change in width between the two guide rails causes the chain clamps on both sides of the film to pull the film outwards, achieving lateral stretching. Because mechanical clamping devices achieve clamping by lifting and pressing the clamp handle, the clamp handle is subjected to a large impact force. Furthermore, when the chain clamps hold wide and thin films or films with low mechanical strength under heat, the film at the clamp opening is subjected to a large shear force at the moment the clamp handle closes, making it prone to breakage or tearing. Therefore, a magnetically controlled clamping device has been developed that uses magnetic force to control the chain handle to complete the clamping, thereby reducing chain clamp wear and extending its service life. However, some chain clamps cannot rotate into position to complete the clamping after being subjected to the magnetic clamping device, thus failing to effectively clamp the film and affecting the film's stretching.

[0003] It is evident that existing technologies still need improvement and enhancement. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a magnetically controlled clamping device for transverse film stretching, which aims to ensure that each chain clamp can complete the clamping action and effectively clamp the film.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A magnetically controlled clamping device for transverse thin film stretching includes a mounting plate, a magnetic control assembly disposed on the mounting plate, a bracket disposed at the bottom of the mounting plate, and a push plate disposed on the bracket; the magnetic control assembly is used to drive the clamp handle of the chain clamp to rotate through magnetic force to achieve clamping, and the push plate is located beside the magnetic control assembly, and the push plate is used to push the chain handle that has failed to rotate into position under the action of the magnetic control assembly to rotate into position.

[0007] The push plate is set horizontally and is a right trapezoid in horizontal projection. The end face of the right trapezoid where the sloping waist is located faces the clamp handle, and the end of the sloping waist near the chain clamp input port is lower than the end of the sloping waist near the chain clamp output port.

[0008] The mounting plate is mounted on a fixed plate via a pivot, and the mounting plate can swing relative to the fixed plate.

[0009] The fixed plate is provided with a linear drive mechanism. The output end of the linear drive mechanism is connected to the mounting plate through a connecting seat. The fixed plate is provided with a hinge seat, and the tail of the linear drive mechanism is hinged to the hinge seat. The linear drive mechanism is used to drive the mounting plate to swing around the rotation axis.

[0010] The connecting seat includes a connector and a U-shaped plate that are connected to each other. The mounting plate is disposed on the inner side of the U-shaped plate. The mounting plate is provided with a bearing. A first pin connected to the inner ring of the bearing is fixed on the U-shaped plate. The outer ring of the bearing is fixedly connected to the mounting plate.

[0011] The rotating shaft includes a second pin vertically mounted on a fixed plate, a positioning sleeve sleeved around the outer circumference of the second pin, and a connecting sleeve sleeved around the outer circumference of the positioning sleeve. A self-lubricating bearing is provided between the positioning sleeve and the connecting sleeve. The mounting plate is fixedly connected to the connecting sleeve.

[0012] The magnetic control assembly includes multiple magnetic boxes arranged at the bottom of the mounting plate along the length of the mounting plate. The mounting plate has an equal number of oblong holes corresponding to the number of magnetic boxes. Each oblong hole extends along the width of the mounting plate.

[0013] The magnetic box includes a box body with an upper opening, multiple strong magnets stacked in the inner cavity of the box body, and a cover plate that presses down the strong magnets; the box body is provided with two threaded holes, and two screws pass through the waist-shaped hole of each mounting plate from top to bottom, with the bottom end of each screw screwed into the corresponding threaded hole.

[0014] The row of magnetic boxes on the mounting plate magnetically attracts the clamp handles one by one along the direction of the chain clamp's travel on the guide rail, so that the clamp handles rotate the same angle in the clamping direction each time.

[0015] The linear drive mechanism is a cylinder.

[0016] Beneficial effects:

[0017] Compared with the prior art, the magnetically controlled clamping device provided by the present invention sets a push plate next to the magnetic control component. When some chain clips fail to close due to insufficient magnetic attraction force or excessive rotational resistance, the chain handle makes rigid contact with the push plate. Then, the clip handle rotates gradually in the clamping direction under the push plate, so that the clamping surface of the clip handle clamps the film with the clamping opening of the clip body, ensuring that each chain clip is successfully clamped and the film can be stretched smoothly. Attached Figure Description

[0018] Figure 1 This is a top view of the magnetically controlled clamping device provided by the present invention in its working state.

[0019] Figure 2 This is a top view of the magnetically controlled clamping device provided by the present invention in a non-working state.

[0020] Figure 3 for Figure 1 Sectional view of AA.

[0021] Figure 4 A longitudinal cross-sectional view of the magnetic control component in the magnetically controlled clamping device provided by the present invention.

[0022] Figure 5 A top view of the push plate and the bracket in the magnetically controlled clamping device provided by the present invention.

[0023] Key component symbols: 11-Mounting plate, 2-Magnetic control assembly, 3-Bracket, 4-Push plate, 5-Clamp handle, 7-Rotating shaft, 12-Fixing plate, 8-Linear drive mechanism, 81-Hinge seat, 82-Connecting seat, 821-Connecting head, 822-U-shaped plate, 823-Bearing, 824-First pin, 71-Second pin, 72-Positioning sleeve, 73-Connecting sleeve, 74-Self-lubricating bearing, 21-Magnetic box, 211-Box body, 212-Strong magnet, 213-Cover plate, 2111-Stainless steel square tube, 2112-Epoxy resin, 22-Threaded hole, 23-Screw. Detailed Implementation

[0024] This invention provides a magnetically controlled clamping device for transverse stretching of a thin film. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the scope of protection of the invention.

[0025] In this article, "after" refers to the direction in which the chain clamps move to clamp the film, i.e. Figure 1 and Figure 2 The direction of the middle arrow is opposite to that of the forward and backward arrows.

[0026] Please see Figures 1-5 The present invention provides a magnetically controlled clamping device for transverse stretching of a thin film, comprising a mounting plate 11, a magnetically controlled assembly 2 disposed on the mounting plate 11, a bracket 3 disposed at the bottom of the mounting plate 11, and a push plate 4 disposed on the bracket 3 (due to the push plate being in...). Figure 1 It cannot be directly observed in the middle, the push plate is in Figure 1 (shown in dashed lines); The magnetic control component 2 is used to drive the clamp handle 5 of the chain clamp to rotate through magnetic force to achieve clamping. The push plate 4 is located beside the magnetic control component 2, and the push plate 4 is used to push the chain handle that has failed to rotate into place under the action of the magnetic control component 2 to rotate into place. Here, the clamp handle 5 of the chain clamp is made of magnetically conductive material, and magnetic attraction can occur between the magnetic control component 2 and the clamp handle 5.

[0027] In practical applications, the magnetically controlled clamping device is installed at the entrance of the film stretching production line, with sprocket 13 traction chain 14. Figure 1 and Figure 2 (Only part of the chain is shown in the diagram) The chain 14 carries the chain clip 6 on the film stretching production line. When the end of the clip 5 passes under the magnetic control component 2 during the movement of the chain clip 6, it is attracted by the magnetic control component 2 and gradually rotates the clip 5 in the clamping direction. The clamping surface 53 of the clip 5 closes with the clamping opening 54 of the clip body 51, and the clamping is completed smoothly. When some chain clips cannot be clamped due to insufficient magnetic attraction or excessive rotational resistance, the chain handle makes rigid contact with the push plate 4. Then, the clip 5 rotates gradually in the clamping direction under the push of the push plate 4, so that the clamping surface of the clip 5 clamps the film with the clamping opening of the clip body, ensuring that the chain clip is successfully clamped and the film can be stretched smoothly.

[0028] It should be noted that when the chain clamp 6 is in a normal state and the chain clamp can be attracted and driven by the magnetic control component 2, the clamp handle 5 will not come into contact with the push plate 4.

[0029] For details, please refer to Figure 1 and Figure 5 The push plate 4 is horizontally positioned and appears as a right-angled trapezoid in its horizontal projection. The end face of the inclined waist 641 of the right-angled trapezoid faces the clamp handle 5, and the end of the inclined waist near the chain clamp input port is lower than the end of the inclined waist near the chain clamp output port. With this configuration, the chain handle rotates smoothly under the guidance of the end face where the inclined waist is located. When the chain handle 5 disengages from the push plate 4, the clamping surface of the clamp handle 5 smoothly closes with the clamping opening of the clamp body. The push plate 4 serves two purposes: firstly, it assists in the clamping of the chain clamp, allowing the chain handle to complete the clamping action under the combined action of the magnetic control component 2 and the push plate 4; secondly, the push plate 4 provides a guarantee for the chain clamping, ensuring successful clamping when the magnetic control component 2 fails.

[0030] For further details, please refer to Figure 1 and Figure 2 The mounting plate 11 is mounted on a fixed plate 12 via a rotating shaft 7, and the mounting plate 11 can swing relative to the fixed plate 12. With this configuration, the magnetic control component 2 and the push plate 4 on the mounting plate 11 can switch between a working mode (driving the chain clamp to complete the clamping action) and a non-working mode (not acting on the chain clamp), which facilitates the maintenance and adjustment of the film stretching line.

[0031] For preferred options, please refer to [link / reference]. Figure 1-3The fixed plate 12 is equipped with a linear drive mechanism 8. The output end of the linear drive mechanism 8 is connected to the mounting plate 11 via a connecting seat 82. The fixed plate 12 is equipped with a hinge seat 81, and the tail of the linear drive mechanism 8 is hinged to the hinge seat 81. The linear drive mechanism 8 is used to drive the mounting plate 11 to swing around the rotating shaft 7. When the magnetic control clamping device or the chain clamp conveyor line needs maintenance and debugging, the linear drive mechanism 8 drives the mounting plate 11 and the magnetic control component 2 and push plate 4 on the mounting plate 11 to swing away from the chain clamp conveying direction, which makes it easier for workers to operate with sufficient clearance. Moreover, when the chain clamp passes through the mounting plate 11, the magnetic control component 2 and push plate 4 will not act on the chain handle, which makes it easy to observe and debug the conveying trajectory of the chain clamp.

[0032] Here, the linear drive mechanism 8 is preferably a cylinder, which can operate well even in high-temperature working environments and has good applicability.

[0033] For further details, please refer to Figure 3 The connecting seat 82 includes a connecting head 821 and a U-shaped plate 822 that are connected to each other. The mounting plate 11 is disposed on the inner side of the U-shaped plate 822. The mounting plate 11 is provided with a bearing 823. A first pin 824 connected to the inner ring of the bearing 823 is fixed on the U-shaped plate 822. The outer ring of the bearing 823 is fixedly connected to the mounting plate 11.

[0034] For preferred options, please refer to [link / reference]. Figure 3 The rotating shaft 7 includes a second pin 71 vertically mounted on the fixed plate 12, a positioning sleeve 72 sleeved around the second pin 71, and a connecting sleeve 73 sleeved around the positioning sleeve 72. A self-lubricating bearing 823 is provided between the positioning sleeve 72 and the connecting sleeve 73. The mounting plate 11 is fixedly connected to the connecting sleeve 73. With this arrangement, on the one hand, the connecting sleeve 73 rotates smoothly and stably around the second pin 71; on the other hand, the self-lubricating bearing 823 reduces the friction between the positioning sleeve 72 and the connecting sleeve 73, so that the rotating shaft 7 does not require oil lubrication, has excellent wear resistance, and can maintain a good working condition even under high temperature conditions. Lubricating oil contamination of the film affects product quality.

[0035] For details, please refer to Figure 1-4 The magnetic control assembly 2 includes a plurality of magnetic boxes 21 arranged at the bottom of the mounting plate 11 and along the length of the mounting plate 11. The mounting plate 11 has an equal number of waist-shaped holes 24 corresponding to the number of magnetic boxes 21. Each waist-shaped hole 24 extends along the width of the mounting plate 11.

[0036] For further details, please refer to Figure 4The magnetic box 21 includes a box body 211 with an upper opening, multiple strong magnets 212 stacked inside the box body 211, and a cover plate 213 that presses down the strong magnets 212. The box body 211 is made of stainless steel square tube 2111 and epoxy resin 2112 filled inside the square tube, which protects the fragile strong magnets 212. The box body 211 is provided with two threaded holes 22. Two screws 23 pass through the waist-shaped hole 24 of each mounting plate 11 from top to bottom, and the bottom end of each screw 23 is screwed into the corresponding threaded hole 22. The position of the box 211 is adjusted along the length of the waist-shaped hole 24, so that the row of magnetic boxes 21 on the mounting plate 11 magnetically attracts the clamp handles 5 one by one along the direction of the chain clamp's travel on the guide rail. This makes the clamp handles rotate by the same angle each time in the clamping direction, thereby making the chain handles rotate smoothly under the action of magnetic force to complete the clamping action. Whether the chain clamps a wide and thin film or a film with low mechanical strength under heat, there is very little chance of breakage or tearing, ensuring the quality of the film and the product of the stretching production line.

[0037] It is understood that those skilled in the art can make equivalent substitutions or changes to the technical solution and inventive concept of the present invention, and all such changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A magnetically controlled clamping device for transverse stretching of a thin film, characterized in that, The system includes a mounting plate, a magnetic control assembly mounted on the mounting plate, a bracket at the bottom of the mounting plate, and a push plate mounted on the bracket. The magnetic control assembly drives the chain clip shank to rotate via magnetic force to achieve clamping. The push plate is located beside the magnetic control assembly and is used to push the chain clip shank that has failed to rotate into position under the action of the magnetic control assembly. The push plate is horizontally positioned and forms a right-angled trapezoid in its horizontal projection, with the end face of the trapezoid's sloping side facing the chain clip shank. The end of the sloping side near the chain clip input port is lower than the end near the chain clip output port. The mounting plate is mounted on a fixed plate via a pivot and can swing relative to the fixed plate. The fixed plate has a linear drive mechanism, the output end of which is connected to the mounting plate via a connecting seat. The fixed plate has a hinge seat, and the tail of the linear drive mechanism is hinged to the hinge seat. The linear drive mechanism drives the mounting plate to swing around the pivot. The magnetic control assembly includes multiple magnetic boxes arranged at the bottom of the mounting plate along its length. The mounting plate has a number of oblong holes that correspond one-to-one with the number of magnetic boxes; each oblong hole extends along the width of the mounting plate; each magnetic box includes a box body with an upper opening, multiple strong magnets stacked inside the box body, and a cover plate that holds the strong magnets in place; each box body has two threaded holes, and two screws pass through each oblong hole of the mounting plate from top to bottom, with the bottom end of each screw screwed into the corresponding threaded hole; a row of magnetic boxes on the mounting plate magnetically attracts the clamp handles one by one along the direction of the chain clamp's travel on the guide rail, so that each clamp handle... The connecting seat rotates by the same angle in the closing direction; the connecting seat includes a connecting head and a U-shaped plate connected to each other, the mounting plate is set on the inner side of the U-shaped plate, the mounting plate is provided with a bearing, a first pin shaft connected to the inner ring of the bearing is fixed on the U-shaped plate, and the outer ring of the bearing is fixedly connected to the mounting plate; the rotating shaft includes a second pin shaft vertically set on the fixed plate, a positioning sleeve sleeved on the outer circumference of the second pin shaft, and a connecting sleeve sleeved on the outer circumference of the positioning sleeve, and a self-lubricating bearing is provided between the positioning sleeve and the connecting sleeve; the mounting plate and the connecting sleeve are fixedly connected.

2. The magnetically controlled clamping device for transverse film stretching according to claim 1, characterized in that, The linear drive mechanism is a cylinder.

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