A cooling structure for chain clamps in a cross-type drawing machine

Abstract

This utility model discloses a cooling structure for chain clamps in a cross-drawing machine. The track frame is a hollow tube, with an inlet pipe and a drain pipe at each end, connected to the internal space of the track frame. An upper and lower protective cover are provided on the side of the track frame near the progress guide plate, surrounding the progress guide plate and the chain clamps on it. A clamping gap is formed between the upper and lower protective covers on the side away from the track frame, through which the film clamping part extends. A return protective cover is provided on the side of the track frame near the return guide plate, completely surrounding the return guide plate and the chain clamps on it. This design can more efficiently transfer cooling to the chain clamps. Furthermore, the protective covers covering both the progress and return chain clamps, with only the portion used for clamping the film exposed, block some heat, further contributing to obtaining the required lower chain clamp temperature at the inlet of the cross-drawing machine.

Description

Technical Field

[0001] This utility model belongs to the technical field of film transverse stretching equipment, specifically relating to a chain clamp cooling structure for a transverse stretching machine. Background Technology

[0002] A transverse film stretching machine (transverse stretcher) has a chain that moves along its length. Numerous chain clamps are installed on the chain to hold and fix the film on both sides along its length. The chain clamps run along an adjustable-pitch track, allowing for stretching and retraction of the film during transport. The chain is generally circular and, at the machine's exit (after film release), is redirected by a sprocket to return to the machine's inlet. The return chain clamps require cooling because the temperature inside the machine is high, and the chain clamps themselves are also at a high temperature, making it unsuitable for direct contact with the unstretched film. Existing cooling methods, such as blowing cold air onto the return chain clamps, have limited effectiveness. For processes with high temperatures at the machine's exit, the chain clamps returning to the machine's inlet cannot be cooled to the required low temperature, leading to problems such as the film being scalded or torn when clamped. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a cooling structure for the chain clamp of a horizontal drawing machine, which solves the problems of poor cooling effect and excessively high temperature of the chain clamp at the inlet of the horizontal drawing machine in the prior art.

[0004] According to the technical solution of this utility model, this utility model provides a cooling structure for a chain clamp of a horizontal drawing machine, including a track frame. A progress guide plate and a return guide plate are respectively arranged along the length direction on both sides of the track frame. The chain clamp of the horizontal drawing machine is slidably mounted on the progress guide plate and the return guide plate. The film clamping part of the chain clamp is located on the side away from the track frame. The track frame is hollow and has a water inlet pipe and a water outlet pipe at both ends, which are connected to the internal space of the track frame. An upper cover and a lower cover are arranged on the side of the track frame near the progress guide plate, surrounding the progress guide plate and the chain clamp on the progress guide plate. A clamping gap is formed between the upper cover and the lower cover on the side away from the track frame, and the film clamping part extends out from the clamping gap. A return cover is arranged on the side of the track frame near the return guide plate, completely surrounding the return guide plate and the chain clamp on the return guide plate.

[0005] In some embodiments, the upper and lower protective covers are connected to the upper and lower surfaces of the track frame, respectively, and the upper and lower ends of the return protective cover are connected to the upper and lower surfaces of the track frame, respectively; an upper heat insulation layer is provided between the upper surface of the track frame and the upper and return protective covers.

[0006] In some implementations, there are gaps between the upper shield and the return shield, as well as between the lower shield and the return shield.

[0007] In some implementations, a lower heat insulation layer is provided between the lower surface of the track frame and the lower protective cover and the return protective cover.

[0008] In some implementations, there are gaps between the chain clamp and the upper guard, lower guard, and return guard.

[0009] In some implementations, the upper guard, lower guard, and return guard are all located inside the housing of the horizontal drawing machine, with the return guard located inside the housing of the horizontal drawing machine near the edge.

[0010] In some embodiments, the upper cover, lower cover, return cover and track frame are all sealed together, the return cover and track frame are enclosed in a sealed tubular shape, and the upper cover, lower cover and track frame are sealed tubular except for a clamping gap.

[0011] In some embodiments, the film clamping part is a needle plate.

[0012] In some implementations, the inlet pipe is connected below the end of the track frame, and the drain pipe is connected above the end of the track frame.

[0013] In some implementations, the inlet pipe is located on the side closer to the return guide plate, and the drain pipe is located on the side closer to the process guide plate.

[0014] Compared with the prior art, the beneficial technical effects of this utility model are as follows: The cooling structure of the chain clamp of this utility model adopts a hollow track frame and is water-cooled, which can more efficiently transfer the cooling energy to the chain clamp. Furthermore, the chain clamps on both the forward and return strokes are covered with protective covers, with only the part used to hold the film exposed. Thus, regardless of whether the cross-stretcher uses hot air or thermal radiation to heat the film, the protective covers can block some of the heat and reduce the temperature of the main body of the chain clamp. Therefore, it is more helpful to obtain the required lower temperature chain clamp at the entrance of the cross-stretcher, effectively preventing problems such as the film being burned. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the left-side structure provided by this utility model.

[0016] Figure 2 This is a schematic diagram of the main structure provided by this utility model.

[0017] Figure 3 This is a top view structural diagram of the present invention.

[0018] Figure 4 This is a three-dimensional structural diagram provided by this utility model.

[0019] Explanation of reference numerals in the attached figures: 1. Track frame; 2. Process guide plate; 3. Return guide plate; 4. Chain clamp; 5. Membrane clamping part; 6. Water inlet pipe; 7. Drain pipe; 8. Upper protective cover; 9. Lower protective cover; 10. Return protective cover; 11. Upper heat insulation layer; 12. Membrane. Detailed Implementation

[0020] This invention provides a cooling structure for the chain clamp of a horizontal drawing machine, which solves the problems of poor cooling effect and excessively high temperature of the chain clamp at the inlet of the horizontal drawing machine in the prior art.

[0021] Please see Figures 1 to 4 This utility model discloses a cooling structure for a chain clamp of a horizontal drawing machine, comprising a track frame 1, with a progress guide plate 2 and a return guide plate 3 respectively arranged along the length direction on both sides of the track frame 1. The chain clamp 4 of the horizontal drawing machine is slidably mounted on the progress guide plate 2 and the return guide plate 3; for example, the chain clamp 4 is limited and movably connected to the progress guide plate 2 and the return guide plate 3 via bearings. The film clamping part 5 of the chain clamp 4 is located on the side away from the track frame 1. As a supplementary explanation, the track frame 1 is provided with two sets, left and right, to... Figure 1 For example, there is only one set, and there is a mirror-symmetrical set on the right side, so that both sides of the film 12 are clamped and stretched at the same time.

[0022] The track frame 1 is a hollow tube, with an inlet pipe 6 and a drain pipe 7 at each end. The inlet pipe 6 and the drain pipe 7 are connected to the internal space of the track frame 1. During operation, cooling water (or other coolant) is introduced through the inlet pipe 6, and the cooling water (or other coolant) whose temperature rises after heat exchange is discharged from the drain pipe 7.

[0023] The track frame 1 has an upper cover 8 and a lower cover 9 on the side near the process guide plate 2. The upper cover 8 and the lower cover 9 surround the process guide plate 2 and the chain clamp 4 on the process guide plate 2. A clamping gap is formed between the upper cover 8 and the lower cover 9 on the side away from the track frame 1, and the film clamping part 5 extends out from the clamping gap. The track frame 1 has a return cover 10 on the side near the return guide plate 3. The return cover 10 completely surrounds the return guide plate 3 and the chain clamp 4 on the return guide plate 3. The upper cover 8, the lower cover 9, and the return cover 10 do not obstruct the movement of the chain clamp 4.

[0024] In a specific embodiment, the upper protective cover 8 and the lower protective cover 9 are connected to the upper and lower surfaces of the track frame 1, respectively, and the upper and lower ends of the return protective cover 10 are connected to the upper and lower surfaces of the track frame 1, respectively. An upper heat insulation layer 11 is provided between the upper surface of the track frame 1 and the upper protective cover 8 and the return protective cover 10. Preferably, a lower heat insulation layer is also provided between the lower surface of the track frame 1 and the lower protective cover 9 and the return protective cover 10. By separating the protective cover from the track frame (cooling water pipe) through the heat insulation layer, the waste of cooling water can be further prevented.

[0025] Furthermore, there are gaps between the upper shield 8 and the return shield 10, as well as between the lower shield 9 and the return shield 10. In other words, the shields on the process side and the return side do not come into contact with each other, thus avoiding direct heat transfer.

[0026] There are gaps between the chain clamp 4 and the upper guard 8, lower guard 9, and return guard 10, and they do not come into contact with each other. This ensures that the chain clamp 4 is not obstructed by the guards, does not rub or bump, and avoids heat being directly transferred from the guards to the chain clamp 4 through contact.

[0027] The solution of this utility model is particularly applicable to chains with internal circulation mode, that is, the upper guard 8, the lower guard 9, the return guard 10 (as well as the chain clamps for the forward and return strokes, etc.) are all located inside the box of the horizontal drawing machine. The return guard 10 is located inside the box of the horizontal drawing machine near the edge. Since the return guard 10 forms a complete closed enclosure structure for the return section, it can effectively reduce the temperature of the chain clamps in the return section.

[0028] Preferably, the upper protective cover 8, lower protective cover 9, return protective cover 10, and track frame 1 are all sealed together. The return protective cover 10 and track frame 1 form a sealed tubular structure. The upper protective cover 8, lower protective cover 9, and track frame 1 form a sealed tubular structure except for a clamping gap. In this design, the protective covers create a sealed space as much as possible, which can further reduce the entry of hot air and heat radiation from the transverse stretcher housing into the protective covers.

[0029] Preferably, the film clamping part 5 is a needle plate, that is, a plate with multiple needles on the outer side with their tips pointing upwards or obliquely upwards. The clamping (holding) effect is achieved by the needles piercing the edge of the film. Compared with the traditional clip-shaped film clamping part, the needle plate is thinner, so it is more suitable for this solution and can be applied to narrower film clamping gaps, so that the protective cover can form a better heat insulation effect.

[0030] Preferably, please refer to Figures 2 to 4 The inlet pipe 6 is connected to the lower end of the track frame 1, and the drain pipe 7 is connected to the upper end of the track frame 1. The inlet has a low liquid level, and the drain has a high liquid level, thus allowing the cooling water to stay in the track frame 1 for a longer time, which helps to achieve sufficient heat exchange. More preferably, the inlet pipe 6 is located on the side closer to the return guide plate 3, and the drain pipe 7 is located on the side closer to the progress guide plate 2, so that more low-temperature cooling water can directly cool the return side. Specifically, for example, the track frame 1 is a square tube, and the inlet pipe 6 and the drain pipe 7 are located at two diagonal positions of the square tube cross-section.

[0031] Cooling is required when applying film to chain clips or needle plates. More importantly, cooling and protecting the chain clip bearings is essential to extend their lifespan. Another point is to cool the track frame itself to prevent excessive deformation, especially when the temperature range is large. In such cases, the film within the range may collapse or experience other uncontrollable phenomena due to deformation of the track frame. The cooling structure of the chain clamp of this utility model adopts a hollow track frame and is water-cooled, which can more efficiently transfer the cooling energy to the chain clamp. Furthermore, the chain clamps on both the forward and return strokes are covered with protective covers, with only the part used to hold the film exposed. Thus, regardless of whether the cross-stretcher uses hot air or thermal radiation to heat the film, the protective covers can block some of the heat and reduce the temperature of the main body of the chain clamp. Therefore, it is more helpful to obtain the required lower temperature chain clamp at the entrance of the cross-stretcher, effectively preventing problems such as the film being burned.

Claims

1. A cross pull machine chain link cooling structure, characterized by, Includes a track frame (1), with a progress guide plate (2) and a return guide plate (3) respectively arranged on both sides along the length direction. The chain clamp (4) of the horizontal stretching machine is slidably arranged on the progress guide plate (2) and the return guide plate (3); the film clamping part (5) of the chain clamp (4) is located on the side away from the track frame (1). The track frame (1) is hollow tube-shaped, and water inlet pipe (6) and drain pipe (7) are respectively installed at both ends of the track frame (1). The water inlet pipe (6) and drain pipe (7) are connected to the internal space of the track frame (1). The track frame (1) is provided with an upper cover (8) and a lower cover (9) on the side near the process guide plate (2). The upper cover (8) and the lower cover (9) surround the process guide plate (2) and the chain clamp (4) on the process guide plate (2). A clamping gap is formed between the upper cover (8) and the lower cover (9) on the side away from the track frame (1). The film clamping part (5) extends out from the clamping gap. The track frame (1) has a return cover (10) on the side near the return guide plate (3), and the return cover (10) completely surrounds the return guide plate (3) and the chain clamp (4) on the return guide plate (3).

2. The cooling structure of the chain clamp for the cross-drawing machine according to claim 1, characterized in that, The upper cover (8) and the lower cover (9) are connected to the upper and lower surfaces of the track frame (1) respectively, and the upper and lower ends of the return cover (10) are connected to the upper and lower surfaces of the track frame (1) respectively; an upper heat insulation layer (11) is provided between the upper surface of the track frame (1) and the upper cover (8) and the return cover (10).

3. The cooling structure of the chain clamp for the cross-drawing machine according to claim 2, characterized in that, There are gaps between the upper shield (8) and the return shield (10), and between the lower shield (9) and the return shield (10).

4. The cooling structure of the chain clamp for the cross-drawing machine according to claim 2, characterized in that, A lower heat insulation layer is provided between the lower surface of the track frame (1) and the lower protective cover (9) and the return protective cover (10).

5. The cooling structure for the chain clamp of the cross-drawing machine according to any one of claims 1-4, characterized in that, There are gaps between the chain clamp (4) and the upper guard (8), the lower guard (9), and the return guard (10).

6. The cooling structure for the chain clamp of the cross-drawing machine according to any one of claims 1-4, characterized in that, The upper guard (8), lower guard (9), and return guard (10) are all located inside the housing of the horizontal stretching machine. The return guard (10) is located inside the housing of the horizontal stretching machine near the edge.

7. The cooling structure for the chain clamp of the cross-drawing machine according to claim 6, characterized in that, The upper guard (8), lower guard (9), return guard (10) and track frame (1) are all sealed together. The return guard (10) and track frame (1) form a sealed tube. The upper guard (8), lower guard (9) and track frame (1) form a sealed tube except for one clamping gap.

8. The cooling structure for the chain clamp of the cross-drawing machine according to any one of claims 1-4, characterized in that, The film clamping part (5) is a needle plate.

9. The cooling structure for the chain clamp of the cross-drawing machine according to any one of claims 1-4, characterized in that, The water inlet pipe (6) is connected to the lower end of the track frame (1), and the drain pipe (7) is connected to the upper end of the track frame (1).

10. The cooling structure of the chain clamp for a horizontal drawing machine according to claim 9, characterized in that, The inlet pipe (6) is located on the side near the return guide plate (3), and the drain pipe (7) is located on the side near the process guide plate (2).

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