Film clamp opening and closing device for film stretching

Abstract

This invention relates to a membrane clamp opening and closing device for membrane stretching, which, when opening the membrane clamp, achieves partial opening with a buffering force, thereby protecting the membrane clamp and improving the working environment. To this end, the membrane clamp opening and closing device includes: a first membrane clamp opening section, which opens the membrane clamp by rotating the upper end of a swing unit holding the membrane using the elastic force of a spring; the rotational force of the membrane clamp is controlled by contact between a first magnet disposed on the upper part of the membrane clamp and the upper end of the swing unit, so that the opening degree of the membrane clamp reaches only 90%; and a second membrane clamp opening section, which, by moving the membrane clamp, which advances along the sprocket of the stretching device for moving the membrane clamp, into a predetermined position, causes the first magnet and the upper end of the swing unit of the membrane clamp to be sequentially separated by a second magnet disposed on the upper part of the first magnet, thereby achieving a 100% opening degree of the membrane clamp.

Description

Technical Field

[0001] The invention relates to a film clamp opening and closing device for film stretching. Background Art

[0002] Generally, microporous membranes are widely used in various fields such as medical dialysis, environmental filtration, and food purification. Recently, microporous membranes are widely used as separators for lithium secondary batteries (lithium ion batteries, lithium polymer batteries, etc.). In particular, microporous membranes used in lithium polymer batteries act as separators between the anode and the cathode and as ion conducting media, that is, they act as electrolytes.

[0003] As described above, the fine porous membrane used as a battery separator and electrolyte can be realized mainly using polyolefin resins. The above-mentioned polyolefin resins include polyethylene and polypropylene. Due to their high crystallinity, when used as a separator of a lithium secondary battery, the tensile strength, rigidity, and impact strength can be improved. In addition, a significant improvement in ion permeability can also be expected.

[0004] The preparation method of the diaphragm using the fine porous film of the polyolefin resin can be prepared using the raw material film. The preparation method of the diaphragm using the raw material film is roughly divided into the stretching method (MCS, one phase), the thermally induced phase separation method (TIPS, two phases), and the phase inversion method (Phase inversion, three phases). Among them, the dry preparation method of the MSS method is mainly used, which uses only polymers as raw materials and only uses stretching (stretching) without using solvents.

[0005] The existing dry preparation method uses a stretching device to prepare a diaphragm with fine pores formed inside by uniaxially stretching the raw material film. The diaphragm preparation method based on uniaxial stretching can achieve mass production with a simple production process, so it is the most economical and has the advantage of being able to improve the tensile strength in the machine direction (MD), but it has the problem of reducing the tensile strength in the width direction (TD), that is, reducing the tensile strength in the direction perpendicular to the stretching direction, thereby reducing the stability of the diaphragm.

[0006] In order to solve this problem, a preparation method is proposed in which a raw material film is stretched twice or more by uniaxial and biaxial stretching using a stretching device. This preparation method of the diaphragm can improve the mechanical strength of the diaphragm, thereby satisfying the high porosity characteristics inside the diaphragm.

[0007] The film stretching device used in the diaphragm preparation process uses a plurality of film clips to hold and fix both sides of the raw film. The number of such film clips may vary depending on the size of the stretching device, but a stretching device may be equipped with a maximum of 2,500 to hold and fix both sides of the raw film.

[0008] The film clamp can hold the raw film or release the holding according to the opening and closing operation. That is, when holding the raw film, the film clamp will remain in a closed state, and when releasing the raw film, it will remain in an open state.

[0009] However, this has the problem that when the opening degree of the film clamp reaches the fully opened state of 100%, the film clamp itself vibrates to generate noise and dust such as iron powder is generated in the surrounding area, which deteriorates the working environment.

[0010] Furthermore, there is a problem that if the membrane clamp is opened for a long time without a buffering force, the durability of the membrane clamp is reduced due to vibration, thereby shortening the life of the device and causing failure.

[0011] Prior art literature

[0012] Patent Literature

[0013] Patent Document 1: Korean Patent Gazette No. 10-2199603 (Invention Title: Film clip and film stretching device for preparing diaphragm including the same, published on January 7, 2021) Summary of the invention

[0014] The present invention is used to solve the above-mentioned problems, and its object is to provide a film clamp opening and closing device for film stretching, that is, when opening the film clamp, the film clamp is partially opened in a manner with a buffer force, thereby protecting the film clamp and improving the working environment.

[0015] According to a preferred embodiment for achieving the above-mentioned purpose of the present invention, the film clamp opening and closing device for film stretching of the present invention may include: a first opening part of the film clamp, which opens the film clamp by rotating the upper end of the swinging unit of the film clamp holding the film with the help of the elastic force of the spring, and controls the rotational force of the film clamp by contact between the first magnet arranged on the upper part of the film clamp and the upper end of the swinging unit, so that the opening degree of the film clamp only reaches 90%; and a second opening part of the film clamp, which enters a specified position by making the film clamp that moves along the sprocket of the stretching device used to move the film clamp enter the specified position, so that the first magnet and the upper end of the swinging unit of the film clamp are separated in sequence by the second magnet arranged on the upper part of the first magnet, so that the opening degree of the film clamp reaches 100%.

[0016] In the first opening portion of the film clamp, the opening degree of the film clamp can be maintained at 90% by forming a gap between the stopper at the lower end of the swing unit that moves with the rotation of the upper end of the swing unit of the film clamp and the film clamp body.

[0017] The first opening portion of the film clamp may include an upper plate and a lower plate, which are respectively assembled on the upper part and the lower part of the first magnet to fix the first magnet.

[0018] The first opening portion of the film clamp may further include a fixing plate disposed on the upper portion of the film clamp to fix the first magnet and the upper plate and the lower plate.

[0019] In the second opening portion of the film clamp, the plurality of second magnets may be fixed to a guide member provided on the upper portion of the film clamp, thereby pulling the upper end portion of the swing unit of the film clamp by means of magnetic force.

[0020] The plurality of second magnets may be arranged in sequence, and the second magnets may be arranged tilted along the advancing direction of the film clamp.

[0021] The second magnet can sequentially pull the upper end of the swing unit of the film clamp moving forward, so that the opening degree of the film clamp reaches 100%.

[0022] According to the film clamp opening and closing device for film stretching of the present invention, when the film clamp is opened after the film stretching operation, it can be opened sequentially in a manner with a buffering force, thereby improving the deterioration of the working environment caused by noise and dust and improving the durability of the film clamp.

[0023] Also, by partially opening the film clamp, the vibration of the stopper is minimized, thereby efficiently operating the equipment and increasing the productivity of the product when stretching the film. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a diagram showing a film clamp opening and closing device for film stretching according to one embodiment of the present invention.

[0025] Figure 2 A diagram showing a first opening portion of a film clamp of a film clamp opening and closing device according to an embodiment of the present invention.

[0026] Figure 3 A diagram showing a second opening portion of a film clamp of a film clamp opening and closing device according to an embodiment of the present invention.

[0027] Figure 4 This is a diagram showing a state in which a film clamp opening and closing device according to an embodiment of the present invention is applied to a film stretching device.

[0028] Description of Reference Numerals

[0029] 1: Membrane clamp opening and closing device

[0030] 10: First opening part of the membrane clamp

[0031] 11: First Magnet

[0032] 12: Upper board

[0033] 13: Lower board

[0034] 14: Fixed plate

[0035] 15: Fixing bolt

[0036] 20: Second opening part of the membrane clamp

[0037] 21: Second magnet

[0038] 22: Guide

[0039] 100: Film stretching equipment

[0040] 110: Membrane clamp

[0041] 111: Film clip body

[0042] 112: Swing unit

[0043] 112a: Upper end of the swing unit

[0044] 112b: Lower end of the swing unit

[0045] 113: Spring

[0046] 114: Rotation axis

[0047] 115: Stopper

[0048] 120: Sprocket

[0049] g: gap DETAILED DESCRIPTION

[0050] Hereinafter, an embodiment of the film clamp opening and closing device for film stretching of the present invention will be described in detail with reference to the accompanying drawings. In this case, the present invention is not limited or restricted by the embodiment. In addition, in the process of describing the present invention, in order to clarify the main purpose of the present invention, the specific description of the known functions or structures may be omitted.

[0051] Figure 1 This is a diagram showing a film clamp opening and closing device for film stretching according to one embodiment of the present invention.

[0052] Reference Figure 1 The film clamp opening and closing device 1 for film stretching of the present invention may include a first film clamp opening part 10 and a second film clamp opening part 20. The first film clamp opening part 10 and the second film clamp opening part 20 are arranged on the upper part of the sprocket 120 for transferring the film clamp 110 of the film stretching equipment 100, so that the transferred film clamps 110 can be opened in sequence.

[0053] That is, the membrane clamp opening and closing device 1 can prevent the membrane clamp 110 from being opened suddenly by the membrane clamp first opening part 10 and the membrane clamp second opening part 20, and guide the membrane clamp 110 to open sequentially, thereby minimizing the vibration generated when opening the membrane clamp 110.

[0054] And, refer to Figure 2In the above-mentioned film clamp 110, a swing unit 112 for fixing the film is rotatably arranged on the film clamp body 111, and the above-mentioned swing unit 112 is elastically connected to the spring 113, so that the swing unit 112 rotates with the help of the force of the spring 113 and opens the film clamp 110. The above-mentioned swing unit 112 is divided into a swing unit upper end 112a and a swing unit lower end 112b with the rotation axis 114 as the center, and a stopper 115 for controlling the opening degree of the film clamp 110 is arranged inside the lower end of the above-mentioned swing unit 112.

[0055] In this embodiment, in the membrane clamp first opening part 10 of the membrane clamp opening and closing device 1, the membrane clamp 110 is opened by rotating the upper end 112a of the swing unit of the membrane clamp 110 holding the membrane with the aid of the elastic force of the spring 113, and the rotational force of the membrane clamp 110 is controlled by the contact between the first magnet 11 arranged on the upper part of the membrane clamp 110 and the upper end 112a of the swing unit, so that the opening degree of the membrane clamp 110 only reaches 90%.

[0056] Furthermore, in the second opening portion 20 of the membrane clamp, the membrane clamp 110 that moves along the sprocket 120 of the membrane stretching device 100 for moving the membrane clamp 110 is brought into a specified position, so that the first magnet 11 and the upper end portion 112a of the swing unit of the membrane clamp 110 are separated in sequence by the second magnet 21 arranged on the upper portion of the first magnet 11, thereby making the opening degree of the membrane clamp 110 reach 100%.

[0057] Therefore, the membrane clamp first opening portion 10 of the membrane clamp opening and closing device 1 is arranged at the part where the moving membrane clamp 110 starts to open, and the membrane clamp 110 is opened only by 90% through the first magnet 11. The membrane clamp second opening portion 20 arranged on the opposite side of the membrane clamp first opening portion 10 opens the moving membrane clamp 110 by 10%, so that the membrane clamp 110 is fully opened. When the membrane clamp 110 opened by 90% passes through the second opening portion 20 of the membrane clamp, the remaining 10% can be opened by multiple second magnets 21.

[0058] Figure 2 A diagram showing a first opening portion of a film clamp of a film clamp opening and closing device according to an embodiment of the present invention.

[0059] Reference Figure 2 In the membrane clamp first opening part 10 of the membrane clamp opening and closing device 1, the opening degree of the membrane clamp 110 is maintained at 90% by forming a gap g between the stopper 115 of the lower end 112b of the swing unit which moves with the rotation of the upper end 112a of the swing unit of the membrane clamp 110 and the membrane clamp body 111.

[0060] That is, the rotation of the swing unit 112 is controlled by making the upper end portion 112a of the swing unit contact with the above-mentioned first magnet 11, so as to form a gap g between the stopper 115 and the membrane clamp body 111, thereby preventing the above-mentioned stopper 115 from contacting the membrane clamp body 111, thereby preventing vibration or noise caused by contact and preventing iron powder from scattering due to vibration.

[0061] In this embodiment, the membrane clamp first opening part 10 of the membrane clamp opening and closing device 1 may include: an upper plate 12 and a lower plate 13, which are respectively assembled on the upper and lower parts of the first magnet 11 to fix the first magnet 11; and a fixing plate 14, which is arranged on the upper part of the membrane clamp 110 to fix the first magnet 11 and the upper plate 12 and the lower plate 13.

[0062] That is, in the first opening portion 10 of the membrane clamp, an upper plate 12 and a lower plate 13 that surround the first magnet 11 from the top and bottom are assembled on the upper part of the fixed plate 14, so that the fixing bolts 15 can be inserted along the vertical direction of the upper plate 12, the first magnet 11 and the lower plate 13 to assemble the assembly of the first magnet 11 on the fixed plate 14.

[0063] Furthermore, the upper plate 12 and the lower plate 13 are made of a magnetic material (MC, Magnetic Core), and the fixing plate 14 is made of a steel material.

[0064] Therefore, the first opening portion 10 of the film clamp can prevent the swing unit 112 of the film clamp 110 from rotating by means of the force of the first magnet 11 , so that the film clamp 110 is only opened by 90%.

[0065] Figure 3 A diagram showing a second opening portion of a film clamp of a film clamp opening and closing device according to an embodiment of the present invention. Figure 4 This is a diagram showing a state in which a film clamp opening and closing device according to an embodiment of the present invention is applied to a film stretching device.

[0066] Reference Figure 3 and Figure 4 In the membrane clamp second opening part 20 of the membrane clamp opening and closing device 1, the plurality of second magnets 21 may be fixed to a guide 22 provided on the upper portion of the membrane clamp 110, thereby pulling the upper end portion 112a of the swing unit of the membrane clamp 110 by means of magnetic force.

[0067] Furthermore, the plurality of second magnets 21 may be arranged in sequence, and the second magnets 21 may be arranged obliquely along the forward direction of the membrane clamp 110. The second magnets 21 may sequentially pull the upper end 112a of the swing unit of the forward membrane clamp 110 to enable the opening degree of the membrane clamp 110 to reach 100%.

[0068] That is, in the second opening portion 20 of the membrane clamp, when the membrane clamp 110 with an opening degree of 90% passes by, the remaining 10% is opened in sequence, and finally the opening degree of the membrane clamp 110 reaches 100%. Ten second magnets 21 are arranged obliquely along the forward direction of the membrane clamp 110, and the membrane clamp 110 passing through the second magnets 21 is opened by 1% in sequence, and finally the remaining 10% is opened.

[0069] Therefore, as described above, the film clamp 110 is divided and opened sequentially, thereby preventing the film clamp 110 from being opened suddenly, thereby eliminating the vibration and noise generated when the film clamp 110 is opened.

[0070] Furthermore, when the film clamp 110 is opened after the film stretching operation, the film clamp opening and closing device 1 can be used to sequentially open the film clamp 110 in a manner with a buffering force, thereby improving the deterioration of the working environment caused by noise and dust and improving the durability of the film clamp 110 .

[0071] Also, the vibration of the stopper 115 may be minimized by partially opening the film clamp 110, thereby efficiently operating the device and improving the productivity of the product when the film is stretched.

[0072] The present invention has been illustrated and described in the drawings by way of preferred embodiments that illustrate the principles of the present invention, but the present invention is not limited to the structures and functions shown and described. It will be appreciated by those skilled in the art that various changes and modifications may be made to the present invention without departing from the spirit and scope of the attached claims.

Claims

1. A film clamp opening and closing device for film stretching, characterized in that: include: The first opening part of the film clamp is configured to open the film clamp by rotating the upper end of the swing unit of the film clamp holding the film by the elastic force of the spring, and the rotation force of the film clamp is controlled by the contact between the first magnet arranged on the upper part of the film clamp and the upper end of the swing unit, and the swing unit of the film clamp is prevented from rotating by the force of the first magnet, so that the opening degree of the film clamp reaches only 90%; and The second opening part of the film clamp is configured to move the film clamp along the sprocket of the stretching device for moving the film clamp into a predetermined position, so that the first magnet and the upper end of the swing unit of the film clamp are separated in sequence by the second magnet arranged on the upper part of the first magnet, so that the opening degree of the film clamp reaches 100%; In the first opening portion of the film clamp, the opening degree of the film clamp is maintained at 90% by forming a gap between the stopper at the lower end of the swing unit that moves with the rotation of the upper end of the swing unit of the film clamp and the film clamp body.

2. The film clamp opening and closing device for film stretching according to claim 1, characterized in that: The first opening portion of the film clamp includes an upper plate and a lower plate, which are respectively assembled on the upper part and the lower part of the first magnet to fix the first magnet.

3. The film clamp opening and closing device for film stretching according to claim 2, characterized in that: The first opening portion of the film clamp further includes a fixing plate disposed on the upper portion of the film clamp to fix the first magnet, the upper plate and the lower plate.

4. The film clamp opening and closing device for film stretching according to claim 1, characterized in that: In the second opening portion of the film clamp, the plurality of second magnets are fixed to a guide provided on the upper portion of the film clamp, thereby pulling the upper end portion of the swing unit of the film clamp by magnetic force.

5. The film clamp opening and closing device for film stretching according to claim 4, characterized in that: The plurality of second magnets are sequentially arranged, and the second magnets are tilted along the advancing direction of the film clip.

6. The film clamp opening and closing device for film stretching according to claim 5, characterized in that: The second magnet sequentially pulls the upper end of the swing unit of the film clamp moving forward, so that the opening degree of the film clamp reaches 100%.

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