A chain clip system in a film stretching device, a slider structure thereof and a film stretching method

Abstract

The present invention discloses a slider structure used in a chain clip system of a stretch film device, comprising two groups of slider bodies symmetrically arranged up and down, a connecting hole is provided inside the slider body, a connecting pin is sleeved inside the connecting hole, a slope is provided at the upper and lower ends of the surface of one side of the slider body, the width of the slope gradually increases from one end of the slider body to the middle of the slider body, an oil storage groove is provided on the surface of the slider body, and the two ends of the oil storage groove are respectively connected to the slopes at the upper and lower ends. The structure is provided with slopes of a certain angle at the upper and lower ends of the surface of the slider body, and the two slopes are connected by a vertical oil storage groove, so that the slider body at the bottom can contact with more lubricating oil, increase the lubrication effect, reduce friction, and thus increase the service life of the slider body.

Description

Technical Field

[0001] The present invention relates to the technical field of chain clamp systems, and in particular to a slider structure used in a film stretching device, the slider structure and a film stretching method. Background Art

[0002] In the film stretching equipment, the transverse stretching machine (TDO) is one of the key equipment in the entire production process, and the chain clip system is a key component that clamps the film for transverse stretching and moves the film forward at the same time, and the slider is one of the key components in the chain clip system. The TDO stretching mechanism consists of a chain clip knife, a clamp arm, a chain clip body, a track, a support, and a chain link. The chain clip slider is one of the core components of the stretching equipment, and its quality directly determines the maximum operating speed and stability of the transverse stretching system and the entire line.

[0003] At present, the total number of domestic double-pull production lines exceeds 400. According to the calculation that medium- and high-speed production lines using sliders account for 50% and each production line uses 3,000 sets of sliders on average, there are about 600,000 sets of sliders in use on the production lines. According to the estimate of 10% as spare, the annual replacement market volume is about 60,000 sets. The annual investment cost in replacing sliders is huge. The main reason why the slider needs to be replaced is that the slider generates friction with the hard steel plate inside the track that fits the outside during medium and high-speed operation. As the use time increases, the slider is easily damaged, and lubricating oil needs to be added between the slider and the steel plate to reduce friction. The slider in the existing chain clamp system consumes a lot of lubricating oil during the friction process. The reason for the consumption is, on the one hand, high-temperature evaporation, and on the other hand, the friction generates high temperature that causes the lubricating oil to deteriorate into waste oil.

[0004] The existing publication number CN201092111Y provides a slider for injection molds, which has a mesh oil storage tank on the surface. Although it can reduce the friction between the slider and the outside to a certain extent, the slider strength is reduced due to the excessive number of oil storage tanks opened on the surface of the slider. After a period of use, the depth of the oil storage tank area will become shallower due to friction, reducing the service life of the slider. At the same time, in the horizontal pulling system of the current stretching system, the side of the slider facing the film needs to be clamped by a clamp during the stretching process. Therefore, the squeeze between the side of the slider facing the film and the hard steel belt is greater, so this side is more severely worn. Research on the failed slider structure shows that the slider failure is all due to wear failure on this side. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and propose a slider structure used in a chain clip system of a stretch film device. The slider structure appears in groups, and each group of slider structures includes two slider bodies symmetrically arranged up and down. The two slider bodies in each group are arranged opposite to each other, and at least two connecting holes are opened inside each of the slider bodies. The connecting holes are sleeved with connecting pins, and the slider bodies are inserted into the holes of the 8-shaped chain links through the connecting pins and connected with the slider bodies of the adjacent groups.

[0006] The upper and lower ends of the surface of one side of the slider body are both provided with slopes, and the width of the slope gradually increases from one end of the slider body to the middle of the slider body;

[0007] An oil storage groove is provided on the surface of the slider body, and both ends of the oil storage groove are respectively connected to the slopes at the upper and lower ends;

[0008] The outer surface of the slider body is in sliding contact with an external hard steel plate sliding track.

[0009] As a further description of the above technical solution: the angle between the slope and the nearly horizontal end surface is 2-10°.

[0010] As a further description of the above technical solution: the cross-section of the oil storage tank is fan-shaped or U-shaped, the width of the oil storage tank is 2-6 mm, and the depth is 0.5-2 mm.

[0011] As a further description of the above technical solution: there is a gap between the adjacent end surfaces of the two groups of slider bodies, a chain link is sleeved on the outside of each connecting pin, and the chain link is located between the two slider bodies.

[0012] As a further description of the above technical solution: fluorine-based materials are added inside the constituent materials of the slider body.

[0013] As a further description of the above technical solution: the content of the fluorine-based material in the material constituting the slider body is 2-5%.

[0014] As a further description of the above technical solution: the vertical central axes of the oil storage grooves on the surfaces of the upper and lower slider bodies of the same group are on the same straight line.

[0015] A chain clip system for a stretch film device, comprising a chain clip system and a hard steel plate sliding track;

[0016] The chain clip system includes a clamp, an 8-shaped chain link and the aforementioned slider structure;

[0017] The hard steel plate sliding track is U-shaped;

[0018] The plurality of slider structures are assembled with fixtures corresponding to each other and connected in series to form a chain structure through 8-shaped chain links, wherein when each slider structure circulates to a side close to the horizontally stretched film, the side with the oil storage tank faces the horizontally stretched film.

[0019] As a further description of the above technical solution: the chain structure includes two groups, which are symmetrically arranged on both sides of the transversely stretched film, and when observed in the same direction as the movement direction of the film, the distance between the two groups of chain structures gradually increases; the U-shaped structure opening of the hard steel plate sliding track is set upward, and the film between the two chain structures is clamped by the clamp from the moment it enters the transverse stretching section. As the chain structure moves forward close to one side of the film, the film continues to move forward and is stretched transversely under the drive of the clamp. When the film is about to move out of the transverse stretching section, the automatic control system controls the clamp to open and releases the film after the transverse stretching is completed.

[0020] A method for stretching a film comprises at least clamping the film by the above-mentioned chain clip system and stretching it transversely, wherein the base material of the film is PE, PET, PP or PS.

[0021] The present invention has the following beneficial effects:

[0022] 1. The present invention provides a combined oil guide structure on the side of the slider body that is severely worn, thereby protecting the structural strength of the slider body to the greatest extent while maintaining lubrication and reducing friction.

[0023] 2. The present invention provides a 2-10° slope at both the upper and lower ends of the surface of one side of the slider body, so that the lubricating oil can flow downward from the slope, so that the slider body below can contact with more lubricating oil, thereby increasing the lubrication effect, and a vertical downward oil storage groove is provided in the middle of the slider body surface. This structure can also make it easier for the lubricating oil to flow into the slider body below, thereby increasing the lubrication effect and thus increasing the service life of the slider body. Compared with the existing mesh groove structure, the present invention only provides one vertical oil storage groove, which can avoid the reduction of the strength of the slider body and the damage during use caused by too many groove structures.

[0024] 3. The present invention reduces the friction coefficient of the slider body by adding 2-5% of fluorine-based materials to the slider body material, thereby reducing the amount of lubricating oil used per unit time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A three-dimensional diagram of a slider structure used in a film stretching device proposed by the present invention;

[0026] Figure 2 A side view of a slider structure used in a film stretching device proposed by the present invention;

[0027] Figure 3 A front view of a slider body of a slider structure used in a film stretching device proposed by the present invention;

[0028] Figure 4 A middle cross-sectional view of a slider structure used in a film stretching device proposed by the present invention;

[0029] Figure 5 A schematic diagram of the cooperation between the slider structure of the chain clip system of a stretch film equipment proposed by the present invention and the hard steel plate sliding track;

[0030] Figure 6 This is a schematic diagram of a chain clip system for a stretch film device proposed by the present invention.

[0031] Legend:

[0032] 1. Slider body; 2. Connecting hole; 3. Connecting pin; 4. Ramp; 5. Oil storage tank; 6. Chain clip system; 7. Hard steel plate sliding track. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Reference Figure 1-Figure 4The present invention provides an embodiment: a slider structure used in a stretch film device, comprising two sets of slider bodies 1 symmetrically arranged in an upper and lower direction, a connecting hole 2 is opened inside the slider body 1, and a connecting pin 3 is sleeved inside the connecting hole 2;

[0036] The upper and lower ends of the surface of one side of the slider body 1 are both provided with a slope 4, and the width of the slope 4 gradually increases from one end of the slider body 1 to the middle of the slider body 1;

[0037] An oil storage groove 5 is formed on the surface of the slider body 1 , and two ends of the oil storage groove 5 are respectively connected to the slopes 4 at the upper and lower ends.

[0038] According to the above technical solution, both upper and lower ends of the surface of one side of the slider body 1 are provided with a slope 4 of 2-10°, so that the lubricating oil can flow downward from the slope 4, so that the slider body 1 at the bottom can contact with more lubricating oil, thereby increasing the lubrication effect, and a vertical downward oil storage tank is provided in the middle of the surface of the slider body 1. This structure can also make the lubricating oil flow more easily to the slider body 1 below, thereby increasing the lubrication effect and thus increasing the service life of the slider body 1.

[0039] Furthermore, the angle between the slope 4 and the nearly horizontal end surface is 2-10°, and preferably, the angle between the slope 4 and the nearly horizontal end surface is 5°.

[0040] Furthermore, the width of the oil storage tank 5 is 2-6mm, and the depth is 0.5-2mm. Preferably, the width of the oil storage tank 5 is 4mm, and the depth of the oil storage tank 5 is 1mm. It can discharge the carbon deposits produced by the deterioration of the lubricating oil due to the high friction temperature, and avoid the accumulation of carbon deposits to cause internal blockage of the entire chain clamp system. Furthermore, the cross-section of the oil storage tank 5 is fan-shaped or U-shaped, and different shapes can be selected according to actual production conditions.

[0041] Furthermore, there is a gap between the adjacent end surfaces of the two groups of slider bodies 1, and the gap between the two is used to place the chain link, and the two connected chain links are connected by the upper and lower slider bodies 1 and the connecting pin 3.

[0042] Furthermore, a fluorine-based material is added to the constituent material of the slider body 1 .

[0043] Furthermore, the content of the fluorine-based material in the material constituting the slider body 1 is 2%-5%.

[0044] According to the above technical solution, by adding 2-5% of fluorine-based materials, the friction coefficient between the slider body 1 and the external hard steel belt can be reduced, so that the friction coefficient of the slider body 1 can be reduced from 0.4 to about 0.35, and the amount of lubricating oil used can be reduced from 10-12L / D to 6-7L / D, thereby reducing the consumption of lubricating oil and making the slider body 1 self-lubricating, thereby improving the service life of the slider body 1 and reducing the noise generated during operation.

[0045] Furthermore, the oil storage grooves 5 on the surfaces of the upper and lower slider bodies 1 are in the same straight line, so that the lubricating oil can smoothly fall from the upper slider body 1 into the lower slider body 1, so that the lower slider body 1 can also be fully lubricated.

[0046] refer to Figure 5-Figure 6 , a chain clip system for a stretch film device, including a chain clip system 6 and a hard steel plate sliding track 7.

[0047] The film stretching equipment can be a biaxial stretching equipment or a transverse stretching equipment.

[0048] The chain clip system 6 includes a clamp (not shown in the figure), an 8-shaped chain link and the above-mentioned slider structure.

[0049] The hard steel plate sliding track 7 is U-shaped.

[0050] The multiple slider structures are assembled with corresponding fixtures on top and are connected in series to form a chain structure through 8-shaped chain links. When each slider structure circulates to the side close to the horizontally pulled film, the side with the oil storage tank 5 faces the horizontally pulled film. Therefore, during use, the lubrication of the slider body 1 facing the film is increased, thereby reducing the friction between it and the external hard steel plate sliding track 7, reducing the degree of wear per unit time, thereby increasing the service life of the entire slider structure and protecting the structural strength of the slider body 1.

[0051] Furthermore, the chain structure includes two groups, which are symmetrically arranged on both sides of the transversely stretched film, and when observed in the same direction as the movement direction of the film, the distance between the two groups of chain structures gradually increases; the U-shaped structure opening of the hard steel plate sliding track 7 is set upward, and the film between the two chain structures is clamped by the clamp from the moment it enters the transverse stretching section. As the chain structure moves forward close to one side of the film, the film continues to move forward and is stretched transversely under the drive of the clamp. When the film is about to move out of the transverse stretching section, the automatic control system controls the clamp to open and releases the film after the transverse stretching is completed.

[0052] A method for stretching a film, wherein a chain clip system 6 clamps the film and stretches it transversely, and the film base material is PE, PET, PP or PS.

[0053] Working principle: When the device is in use, when the film is stretched laterally, when the slider body 1 slides in the track, when the two side surfaces of the slider body 1 contact the hard steel belt inside the track, since the upper and lower ends of the surface of one side of the slider body 1 are provided with a 2-10° slope 4, the lubricating oil can penetrate downward from the slope 4, so that the slider body 1 below can contact with more lubricating oil, thereby increasing the lubrication effect, and a vertical downward oil storage tank is provided in the middle of the surface of the slider body 1. This structure can also enable the lubricating oil to flow more easily to the slider body 1 below, thereby increasing the lubrication effect, thereby increasing the service life of the slider body 1 and reducing the noise during use. At the same time, since the width of the oil storage tank 5 is 2-6mm and the depth is 0.5-2mm, it has a wider width and can discharge carbon deposits caused by the deterioration of the lubricating oil due to high friction temperature, thereby avoiding blockage inside the entire chain clamp system.

[0054] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A slider structure used in a chain clip system of a stretch film device, characterized in that: The slider structures appear in groups, and each group of slider structures comprises two slider bodies (1) symmetrically arranged in an upper and lower direction. The two slider bodies (1) in each group are arranged opposite to each other, and at least two connecting holes (2) are opened inside each slider body (1). A connecting pin (3) is sleeved inside the connecting hole (2). The slider body (1) is inserted into the hole of the 8-shaped chain link through the connecting pin (3) and is connected to the slider body (1) of the adjacent group. The upper and lower ends of the surface of one side of the slider body (1) are both provided with slopes (4), and the width of the slope (4) gradually increases from one end of the slider body (1) to the middle of the slider body (1); An oil storage groove (5) is provided on the surface of the slider body (1), and two ends of the oil storage groove (5) are respectively connected to the slopes (4) at the upper and lower ends; The outer surface of the slider body (1) is in sliding contact with an external hard steel plate sliding track; When each slider structure circulates to a side close to the transversely stretched film, the side having the oil storage tank (5) faces the transversely stretched film.

2. The slider structure used in the chain clip system of the stretch film equipment according to claim 1, characterized in that: The angle between the slope (4) and the nearly horizontal end surface is 2-10°.

3. The slider structure used in the chain clip system of the stretch film equipment according to claim 1, characterized in that: The cross section of the oil storage groove (5) is fan-shaped or U-shaped, and the width of the oil storage groove (5) is 2-6 mm, and the depth is 0.5-2 mm.

4. The slider structure used in the chain clip system of the stretch film equipment according to claim 1, characterized in that: There is a gap between the adjacent end surfaces of the two groups of slider bodies (1), and a chain link is sleeved on the outside of each connecting pin (3), and the chain link is located between the two slider bodies (1).

5. The slider structure used in the chain clip system of the stretch film equipment according to claim 1, characterized in that: Fluorine-based materials are added to the constituent materials of the slider body (1).

6. The slider structure used in the chain clip system of the stretch film equipment according to claim 5, characterized in that: The content of the fluorine-based material in the material constituting the slider body (1) is 2-5%.

7. The slider structure used in the chain clip system of the stretch film equipment according to claim 1, characterized in that: The vertical central axes of the oil storage grooves (5) on the surfaces of the upper and lower slider bodies (1) of the same group are on the same straight line.

8. A chain clip system for a stretch film device, characterized in that: It includes a chain clip system (6) and a hard steel plate sliding track (7); The chain clip system (6) comprises a clamp, an 8-shaped chain link and a slider structure according to any one of claims 1 to 6; The hard steel plate sliding track (7) is U-shaped; Clamps are mounted one by one on the top of the plurality of slider structures and are connected in series through 8-shaped chain links to form a chain structure.

9. A chain clip system for a stretch film device according to claim 8, characterized in that: The chain structure comprises two groups, which are symmetrically arranged on both sides of the film to be stretched transversely, and when observed in the same direction as the film movement direction, the distance between the two groups of chain structures gradually increases; the U-shaped structure opening of the hard steel plate sliding track (7) is arranged upward, and the film between the two chain structures is clamped by the clamp from the moment it enters the transverse stretching section. As the chain structure close to one side of the film moves forward, the film is driven by the clamp to continuously move forward and be stretched transversely. When the film is about to move out of the transverse stretching section, the automatic control system controls the clamp to open and releases the film that has been stretched transversely.

10. A method for stretching a film, characterized in that: The method comprises clamping and transversely stretching the film at least by means of the chain clip system (6) described in claim 8 or 9, wherein the base material of the film is PE, PET, PP or PS.

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