Scratch-resistant film stretching production line chain tong structure

Abstract

The utility model discloses a kind of scratch-proof film stretching production line chain tongs structure, it is related to film stretching production line technical field.The chain tongs structure includes tong seat and the tong handle of rotation setting on tong seat, tong handle and tong seat cooperation form the tong mouth with first clamping surface and second clamping surface.It is in, one of first clamping surface and second clamping surface is rigid clamping surface, and the other is flexible clamping surface.Flexible clamping surface can be realized by setting gasket made of fluorine rubber or FEP etc. by high wear-resistant polymer on tong handle or tong seat.This cooperation structure of " one hard one soft", utilize rigid surface as clamping reference, utilize flexible surface to carry out elastic compensation and disperse pressure, to effectively avoid scratch and indentation to film.

Description

Technical Field

[0001] This utility model relates to the field of film stretching production line technology, and in particular to a scratch-resistant chain clip structure for a film stretching production line. Background Technology

[0002] In film stretching production lines, chain clamps are key components used to hold, support, and transport films, and their performance directly affects the product quality and production efficiency of the films.

[0003] Existing chain clamps typically consist of two rigid metal surfaces for holding the film. During high-speed production, the sharp edges of these metal surfaces, or metal debris and wear deformation from prolonged use, can easily scratch, indent, or crack the film, leading to film breakage and severely impacting product yield. Furthermore, after prolonged use, wear on the two rigid clamping surfaces can reduce adhesion and cause uneven clamping force distribution, making it difficult to stably hold the film. This can lead to the film slipping or detaching during stretching, affecting production stability.

[0004] Therefore, how to provide a chain clamp structure that can avoid scratching the film and achieve long-term stable clamping has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0005] The purpose of this invention is to provide a scratch-resistant chain clamp structure for a film stretching production line, which aims to solve the technical problems of existing chain clamps easily scratching films and unstable clamping after long-term use.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A scratch-resistant film stretching production line chain clamp structure includes: a clamp base; and a clamp handle, rotatably mounted on the clamp base, wherein the clamp handle and the clamp base cooperate to form a clamp mouth having a first clamping surface and a second clamping surface; wherein, one of the first clamping surface and the second clamping surface is a rigid clamping surface and the other is a flexible clamping surface.

[0007] As can be seen, by setting one clamping surface of the clamping jaw to rigid and the other clamping surface to flexible, a "one rigid, one flexible" mating structure is formed. The rigid clamping surface can serve as a stable reference surface, while the flexible clamping surface can, through its own elastic compensation, fit tightly against the film surface, evenly distributing the clamping pressure, thereby effectively eliminating stress concentration, avoiding scratches and indentations on the film, and significantly improving product yield.

[0008] Optionally, the flexible clamping surface is formed by a pad disposed on the clamp handle or clamp seat.

[0009] It is evident that using a pad to create a flexible clamping surface is a simple and easy-to-implement method, and also facilitates replacement and maintenance.

[0010] Optionally, the first clamping surface is located on the clamping shank, and the second clamping surface is located on the clamping seat; the flexible clamping surface is the first clamping surface.

[0011] As can be seen, placing the shim on the side of the movable clamp handle makes the solution flexible and easy to install.

[0012] Optionally, the first clamping surface is located on the clamping shank, and the second clamping surface is located on the clamping seat; the flexible clamping surface is the second clamping surface.

[0013] It is evident that placing the shim on the relatively fixed side of the clamp seat can provide more stable support for the shim, which helps to extend its service life.

[0014] Alternatively, the liner material may be a highly abrasion-resistant polymer.

[0015] It is evident that using a highly wear-resistant polymer as the liner material not only ensures the flexibility of the clamping surface but also guarantees its excellent wear resistance and high-temperature resistance, enabling it to adapt to the high-temperature and high-intensity continuous working environment in the film stretching production line and ensuring long-term reliability.

[0016] Alternatively, the high abrasion-resistant polymer may be fluororubber or FEP.

[0017] It is evident that fluororubber and FEP (fluorinated ethylene propylene copolymer) are both high-performance polymer materials with excellent high-temperature resistance, wear resistance and chemical stability, and low coefficient of friction. They can meet the stringent requirements of film stretching production lines for chain clips and are ideal materials for achieving flexible clamping surfaces.

[0018] Optionally, when the padding is an FEP heat shrink sleeve, the FEP heat shrink sleeve is wrapped around the clamp handle or clamp seat by heat shrinking.

[0019] As can be seen, the heat shrink tubing method is simple and convenient to install. It can be tightly wrapped around the part that needs to form a flexible surface by heating with a hot air gun, forming a seamless and uniform protective layer. It is easy to operate and has high production efficiency.

[0020] Optionally, when the gasket is a fluororubber sleeve, the fluororubber sleeve is integrally formed by precision casting and directly fitted onto the clamp handle or clamp seat.

[0021] As can be seen, fluororubber sleeves can be customized according to the complex shape of the parts through precision casting, so that they fit the parts perfectly. They can be directly put on during installation, making replacement convenient and ensuring the uniform transmission of clamping force.

[0022] Optionally, it also includes a hinged lever spring preload mechanism for driving the lever handle to rotate.

[0023] It is evident that the articulated lever-spring preload mechanism is ingenious and reliable. It can precisely control the opening and closing action of the clamp handle and the magnitude of the clamping force through the lever principle and the preload force of the spring, thus ensuring the smoothness of the chain clamp action and the reliability of the clamping.

[0024] Optionally, the hinged lever spring preload mechanism includes: a spring sleeve, one end of which is hinged to the clamp holder and the other end has an elongated hole; a spring, housed within the spring sleeve; and a slider, housed within the spring sleeve and subjected to the elastic force of the spring, the slider having a groove; wherein a pin hinged to the clamp handle passes through the elongated hole and engages with the groove of the slider to drive the clamp handle to rotate under the elastic force of the spring.

[0025] It is evident that by adding a slider to transmit the spring force and having the groove on the slider engage with the pin, the force transmission path can be clearly defined and the contact stable, making the transmission of the spring force more precise and further improving the reliability of the mechanism's movement. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present invention and, together with their description, serve to explain the principles of the present invention.

[0027] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention (the liner is set on the clamp handle).

[0028] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of this utility model (the liner is set on the clamp seat).

[0029] Figure 3 This is a schematic diagram of the internal structure of this utility model.

[0030] Figure 4 This is a schematic diagram of the hinged lever spring preload mechanism in the closed state in this utility model.

[0031] Figure 5 This is a schematic diagram of the hinged lever spring preload mechanism in the open state in this utility model.

[0032] Explanation of reference numerals in the attached drawings: 1. FEP heat shrink sleeve; 2. Fluororubber sleeve; 3. Rotating shaft; 4. Clamp handle; 5. Upper clamp seat; 6. Lower clamp seat; 7. Self-lubricating bushing; 8. Spring; 9. Spring sleeve; 10. First spring pin; 11. Second spring pin; 12. Slider. Detailed Implementation

[0033] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0034] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0035] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0036] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0038] Please see Figures 1 to 5 This utility model discloses a chain clamp structure for a scratch-resistant film stretching production line. The two rigid metal surfaces of the traditional chain clamp used to hold the film are replaced with a combination of a rigid clamping surface and a flexible clamping surface. Through the combination of "one hard and one soft", the basic stability of the clamping is ensured, and the flexible surface is used to buffer and disperse the clamping force, thereby avoiding damage to the film.

[0039] The chain clamp structure mainly includes a clamp base and a clamp handle 4 rotatably mounted on the clamp base. The clamp base consists of an upper clamp base 5 and a lower clamp base 6, providing a stable mounting base for the entire chain clamp. The clamp handle 4 is mounted on the upper clamp base 5 via a pivot 3 and can rotate around the pivot 3. The front end of the clamp handle 4 is positioned opposite to the corresponding part of the upper clamp base 5, together forming a clamping opening for clamping the film. The clamping opening includes two opposing clamping surfaces: a first clamping surface located on the clamp handle 4 and a second clamping surface located on the upper clamp base 5.

[0040] Of the first and second clamping surfaces, one remains a rigid metal clamping surface, while the other is designed as a flexible clamping surface. This design is chosen because when clamping the film, a rigid surface is needed as a reference to ensure precise and stable clamping position; the flexible surface, through its elastic deformation, can compensate for minute thickness variations in the film and uniformly adhere to its surface. If both surfaces were flexible, the clamping reference would be unstable, the wrapping would be poor, and the surface would be easily damaged.

[0041] The flexible clamping surface can be achieved by placing a pad on the corresponding metal surface. This pad can take various forms, such as a precision-cast and fitted fluororubber sleeve 2, or a heat-shrinkable FEP sleeve 1, or an adhesive soft film, etc.

[0042] To drive the opening and closing of the clamping handle 4 and ensure stable clamping force, this chain clamp structure also incorporates a hinged lever spring preload mechanism. Please refer to [reference needed]. Figures 3 to 5 The hinged lever spring preload mechanism is preferably a common type of hinged lever spring preload mechanism, which cleverly utilizes the change in the direction of the spring force to control the opening and closing of the clamp handle 4 and can stably maintain it in any state. Specifically, the mechanism includes a spring 8, a spring sleeve 9, a first spring pin 10, a second spring pin 11, and a slider 12. One end of the spring sleeve 9 is rotatably hinged to the clamp base (specifically, it can be hinged to an extension structure of the upper clamp base 5) via the first spring pin 10. The other end of the spring sleeve 9 has an elongated hole along its length. Both the spring 8 and the slider 12 are housed inside the spring sleeve 9. The slider 12 is located between the spring 8 and the second spring pin 11, and the elastic force of the spring 8 acts on the slider 12. On the side of the slider 12 facing the second spring pin 11, a semi-circular groove is provided, which mates with the outer circumferential surface of the second spring pin 11. The second spring pin 11 passes through the elongated hole and is hinged to the clamp handle 4, while simultaneously abutting against the groove of the slider 12. Its working principle is as follows: when the clamp needs to be closed to hold the film, the clamp handle 4 rotates in the opposite direction, causing the line of action of the spring force F1 of the spring 8 to cross the straight line connecting the center of the rotating shaft 3 and the center of the first spring pin 10, and to be located below it (e.g., ...). Figure 4 As shown), at this time, the spring force F1 will push the clamp handle 4 to press against the clamp opening, thereby achieving a stable and reliable clamping. Conversely, when it is necessary to open the clamp opening, the clamp handle 4 rotates around the pivot 3, so that the line of action of the spring force F2 of the spring 8 is located above the straight line connecting the center of the pivot 3 and the center of the first spring pin 10 (as shown). Figure 5 As shown in the diagram, the spring force F2 will continuously push the clamp handle 4 to rotate until it is fully open and stabilizes in the open state. This over-center structure ensures that the chain clamp is self-locking in both open and closed states, with crisp and clean action and a constant clamping force. To make the rotation of the clamp handle 4 smoother, a self-lubricating bushing 7 can also be installed at the pivot 3.

[0043] The specific configuration of the flexible clamping surface will be further explained below.

[0044] In some embodiments, please refer to Figure 1A flexible clamping surface is provided on the clamping shank 4, while the second clamping surface on the upper clamping seat 5, opposite to the clamping shank 4, is a rigid clamping surface. Specifically, a gasket made of a highly wear-resistant polymer (such as FEP or fluororubber), such as an FEP heat-shrink sleeve 1 or a fluororubber sleeve 2, is provided at the front clamping part of the clamping shank 4. When the clamping shank 4 is closed, the flexible clamping surface formed on it cooperates with the rigid clamping surface on the upper clamping seat 5 to clamp the film together.

[0045] In other embodiments, please refer to Figure 2 A flexible clamping surface is provided on the upper clamp seat 5, while the first clamping surface on the clamp handle 4 opposite to the upper clamp seat 5 is a rigid clamping surface. Specifically, a gasket, such as a fluororubber sleeve 2 or an FEP heat shrink sleeve 1, is provided on the upper clamp seat 5 in the area opposite to the clamp handle 4. When the clamp handle 4 is closed, its rigid clamping surface presses against the flexible clamping surface on the upper clamp seat 5, stably clamping the film between the two.

[0046] In summary, this invention cleverly solves the technical problems of existing chain clamps easily scratching films and having unstable clamping during film stretching production by innovatively designing the clamping jaws as a combination of "one hard and one soft" clamping surfaces, and combining it with a hinged lever spring pre-tightening mechanism. This structural design is reasonable and can not only significantly improve the quality and production yield of film products, but also extend the service life of the chain clamp itself, possessing high practical value and economic benefits.

[0047] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A chain clamp structure for a scratch-resistant film stretching production line, characterized in that, include: Jaw base; as well as A clamp handle is rotatably mounted on the clamp seat, and the clamp handle and the clamp seat cooperate to form a clamp mouth having a first clamping surface and a second clamping surface; In this configuration, one of the first clamping surface and the second clamping surface is a rigid clamping surface, and the other is a flexible clamping surface.

2. The chain clamp structure of the anti-scratch film stretching production line according to claim 1, characterized in that, The flexible clamping surface is formed by a pad disposed on the clamp handle or the clamp seat.

3. The chain clamp structure of the anti-scratch film stretching production line according to claim 2, characterized in that, The first clamping surface is located on the clamp handle, and the second clamping surface is located on the clamp base; the flexible clamping surface is the first clamping surface.

4. The chain clamp structure of the anti-scratch film stretching production line according to claim 2, characterized in that, The first clamping surface is located on the clamp handle, and the second clamping surface is located on the clamp base; the flexible clamping surface is the second clamping surface.

5. The chain clamp structure of the anti-scratch film stretching production line according to claim 2, characterized in that, The liner is made of a highly abrasion-resistant polymer.

6. The chain clamp structure of the anti-scratch film stretching production line according to claim 5, characterized in that, The high wear-resistant polymer is fluororubber or FEP.

7. The chain clamp structure of the anti-scratch film stretching production line according to claim 6, characterized in that, When the gasket is an FEP heat shrink sleeve, the FEP heat shrink sleeve is wrapped around the clamp handle or the clamp seat by heat shrinking.

8. The chain clamp structure of the anti-scratch film stretching production line according to claim 6, characterized in that, When the gasket is a fluororubber sleeve, the fluororubber sleeve is integrally formed by casting and directly fitted onto the clamp handle or the clamp seat.

9. The chain clamp structure of the anti-scratch film stretching production line according to claim 1, characterized in that, It also includes a hinged lever spring preload mechanism for driving the lever handle to rotate.

10. The chain clamp structure of the anti-scratch film stretching production line according to claim 9, characterized in that, The articulated lever spring preload mechanism includes: A spring sleeve, one end of which is hinged to the clamp seat, and the other end has an elongated hole; A spring, housed within the spring sleeve; and The slider is housed within the spring sleeve and is subjected to the elastic force of the spring; the slider is provided with a groove. The pin hinged to the shank passes through the elongated hole and engages with the groove of the slider to drive the shank to rotate under the elastic force of the spring.

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