Anti-folding mechanism for impregnated canvas

Abstract

The utility model discloses a kind of impregnated canvas anti-folding mechanism, including first spreader, second spreader and third spreader, first spreader and second spreader are bent roller and are installed on the rack below oven with interval, third spreader surface is equipped with thread and is installed at oven outlet, canvas is guided after first guide roller and passes through the outside of first spreader below and enters the inside of second spreader, again enter oven by second guide roller guidance, canvas from oven passes through third guide roller guidance after being guided by third spreader, first spreader and second spreader are fixedly installed, third spreader is passively rotated with canvas traction. First spreader and second spreader adopt bent roller, different tension is applied to canvas middle part and both sides, ensure that width is set width, third spreader is set at oven outlet and has better opening support effect to high-temperature canvas, prevent canvas from folding.

Description

Technical Field

[0001] This utility model belongs to the field of canvas weaving technology, specifically relating to a crease-resistant mechanism for dipped canvas. Background Technology

[0002] Canvas impregnation involves immersing the canvas in a resin solution followed by heat treatment at a specific time and temperature to achieve a bond between the canvas and rubber. However, during the impregnation process, especially for fabrics with a width exceeding 1500m, the canvas is prone to folding due to the material's inherent thermal shrinkage and the influence of hot air within the drying oven's ducts.

[0003] The currently used canvas anti-crease device includes an arc-shaped expansion rod installed on one side of the traction roller. The length of the expansion rod is perpendicular to the canvas traction direction, and the distance between the two ends of the expansion rod is approximately equal to the width of the canvas. A support rod is connected to the middle of the expansion rod, and a pull rope is installed on the support rod. The pull rope is taut and symmetrically connected to both ends of the expansion rod, pulling the two ends of the expansion rod inward. The other end of the support rod is connected to the base. This device uses the outward convex curved surface of the expansion rod to press tightly against the canvas surface from the front, especially in the middle of the canvas, applying force to the canvas to generate an expansion effect, thereby preventing the canvas from creases. However, commercial and residential devices are mainly designed for ultra-thin canvases with less heat shrinkage. For canvases with greater heat shrinkage and wider width, the anti-crease effect is not good, and creases still occur. Utility Model Content

[0004] The purpose of this invention is to provide a mechanism to prevent creases in coated canvas, thereby reducing heat shrinkage and creases in canvases with a large width.

[0005] The technical solution adopted by this utility model is a crease-resistant anti-folding mechanism for dipped canvas, including a first expanding roller, a second expanding roller, and a third expanding roller. The first and second expanding rollers are curved rollers and are installed on a frame below the oven at intervals. The third expanding roller has threads on its surface and is installed at the oven outlet. After being guided by the first guide roller, the canvas passes around the outside of the first expanding roller located below and enters the inside of the second expanding roller. Then, it is guided by the second guide roller into the oven. After exiting the oven, the canvas passes around the third expanding roller and is guided by the third guide roller. The first and second expanding rollers are fixedly installed, and the third expanding roller rotates passively with the traction of the canvas.

[0006] Furthermore, the aforementioned first expanding roller includes a roller body, which is wavy and curved. The middle part of the roller body curves outward and upward, while the two sides curve outward with a less pronounced curvature than the middle part. Roller shafts are provided at both ends of the roller body. A connecting plate is provided at the outer end of the roller shaft, which is bent outward. A connecting shaft is fixedly connected to the outer end of the connecting plate. The connecting shaft passes through the mounting hole of the fixed seat and is secured with a fastening nut. The fixed seat is bolted to the frame. The structure of the second expanding roller is the same as that of the first expanding roller.

[0007] Furthermore, the first and second expanding rollers are installed alternately, with a horizontal distance of 3-5 cm between them.

[0008] Furthermore, the first and second expanding rollers mentioned above are rubber rollers, and the diameters of the first and second expanding rollers are 20cm.

[0009] Furthermore, the aforementioned third expansion roller is a stainless steel roller with a diameter of 15cm and a thread pitch of 2cm on its surface.

[0010] Furthermore, the diameter of the third guide roller is three times that of the third expansion roller, and the third expansion roller is in close contact with the canvas and is horizontally offset by 3-5 cm.

[0011] Compared with the prior art, the beneficial effects of this utility model are that by installing a first expanding roller and a second expanding roller on the canvas travel path before entering the drying oven, the canvas about to enter the drying oven is pre-tensioned and wrinkle-removed. The first expanding roller and the second expanding roller are curved rollers, which apply different tensions to the middle and both sides of the canvas to ensure that the width is the set width. A third expanding roller is set at the exit of the drying oven, and the third expanding roller is externally threaded, which has a better opening and support effect on the high-temperature canvas and prevents the canvas from folding. Especially for heat-shrinkable canvas and canvas with a large width, the anti-folding effect is better, and the canvas folding phenomenon is greatly reduced. Attached Figure Description

[0012] Figure 1 A schematic diagram showing the arrangement of the anti-crease device for dipped canvas; Figure 2 This is a front view of the first and second expanding rollers; Figure 3 This is a top view of the first expanding roller; Figure 4 This is a front view of the third expansion roller. Detailed Implementation

[0013] The present invention will be further explained below with reference to the accompanying drawings to enable those skilled in the art to better understand it.

[0014] Example 1 like Figure 1-4As shown, a crease-resistant canvas anti-crease mechanism includes a first expanding roller 1, a second expanding roller 2, and a third expanding roller 3. The first expanding roller 1 and the second expanding roller 2 are curved rollers and are installed vertically and horizontally on a frame below an oven 4. The third expanding roller 3 has threads on its surface and is installed at the outlet of the oven 4. The canvas 5 is guided by the first guide roller 6 and then passes around the outside of the first expanding roller 1 located below, enters the inside of the second expanding roller 2, and is then guided by the second guide roller 7 into the oven 4. The canvas exiting the oven 4 passes around the third expanding roller 3 and is guided by the third guide roller 8. The first expanding roller 1 and the second expanding roller 2 are fixedly installed, and the third expanding roller 3 is passively rotated with the traction of the canvas. The canvas about to enter the drying oven 4 is pre-tensioned and wrinkled using the first expansion roller 1 and the second expansion roller 2. The first expansion roller 1 and the second expansion roller 2 are curved rollers that apply different tensions to the middle and sides of the canvas 5 to ensure that the width is the set width. A third expansion roller 3 is set at the outlet of the drying oven 4. The third expansion roller 3 is externally threaded, which has a good opening support effect on the high temperature canvas and effectively prevents the canvas from folding.

[0015] Furthermore, the aforementioned first expanding roller 1 includes a roller body 101, which is wavy and curved. The middle of the roller body 101 curves outward and upward, while the two sides curve outward less than the middle. Roller shafts 102 are respectively provided at both ends of the roller body 101. A connecting plate 103 is bent outward at the outer end of the roller shaft 102. A connecting shaft 104 is fixedly connected to the outer end of the connecting plate 103. The connecting shaft passes through the mounting hole of the fixing seat 105 and is fastened with a fastening nut. The fixing seat 105 is bolted to the frame. The structure of the second expanding roller 2 is the same as that of the first expanding roller 1. This structure of the first and second expanding rollers has a good opening and width-fixing effect on the canvas. The installation angle of the first and second expanding rollers can be adjusted by rotating the connecting plate and the connecting shaft, thereby adjusting the tension on the canvas.

[0016] Furthermore, in order to better support the canvas, the first spreading roller 1 and the second spreading roller 2 are installed alternately, with a horizontal distance of 3-5cm between the first spreading roller 1 and the second spreading roller 2, and an included angle of 32°-37° between the canvas.

[0017] The first and second widening rollers 1 and 2 are rubber rollers that generate friction with the canvas to prevent it from folding. Both rollers have a diameter of 20cm, maintaining the widening effect without affecting canvas traction. The third widening roller 3 is a stainless steel roller with high temperature and corrosion resistance. It has a diameter of 15cm and a thread pitch of 2cm, using the threads to provide support for the high-temperature canvas and prevent folding.

[0018] Furthermore, the diameter of the third guide roller 8 is three times the diameter of the third expansion roller 3. The third expansion roller 3 is in close contact with the canvas and is horizontally offset by 3-5 cm to ensure that the third expansion roller 3 generates sufficient tension on the canvas.

[0019] To enhance the anti-crease effect on the canvas, the third spreading roller is mainly installed at the outlet of the drying oven in zones three and five.

[0020] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from its design spirit and principles should fall within the protection scope defined by the claims of the present invention.

Claims

1. A crease-preventing mechanism for impregnated canvas, characterized in that, It includes a first expanding roller (1), a second expanding roller (2) and a third expanding roller (3). The first expanding roller (1) and the second expanding roller (2) are curved rollers and are installed on the frame below the oven (4) with an upper and lower gap. The third expanding roller (3) has a thread on its surface and is installed at the outlet of the oven (4). After being guided by the first guide roller (6), the canvas (5) passes around the outside of the first expanding roller (1) located below and enters the inside of the second expanding roller (2). Then it is guided by the second guide roller (7) into the oven. After the canvas (5) comes out of the oven (4), it passes around the third expanding roller (3) and is guided by the third guide roller (8). The first expanding roller (1) and the second expanding roller (2) are fixedly installed. The third expanding roller (3) is passively rotated with the traction of the canvas (5).

2. The impregnated canvas anti-kinking mechanism according to claim 1, characterized in that, The first expansion roller (1) includes a roller body (101), which is wavy and curved. The middle part of the roller body (101) is bent outward and upward, and the two sides are bent outward and the degree of bending is less than that of the middle part. Roller shafts (102) are respectively provided at both ends of the roller body (101). A connecting plate (103) is bent outward at the outer end of the roller shaft (102). A connecting shaft (104) is fixedly connected to the outer end of the connecting plate (103). The connecting shaft (104) passes through the mounting hole of the fixed seat (105) and is fastened with a fastening nut. The fixed seat (105) is bolted to the frame. The structure of the second expansion roller (2) is the same as that of the first expansion roller (1).

3. The anti-kinking mechanism for impregnated fabric according to claim 2, wherein The first expansion roller (1) and the second expansion roller (2) are installed alternately, and the horizontal distance between the first expansion roller (1) and the second expansion roller (2) is 3-5cm.

4. The impregnated canvas anti-kinking mechanism according to claim 1, wherein, The first expansion roller (1) and the second expansion roller (2) are rubber rollers, and the diameter of the first expansion roller (1) and the second expansion roller (2) is 20cm.

5. The impregnated canvas anti-kinking mechanism according to claim 1, wherein, The third expansion roller (3) is a stainless steel roller with a diameter of 15cm and a thread pitch of 2cm on its surface.

6. The impregnated canvas anti-kinking mechanism according to claim 1, wherein, The diameter of the third guide roller (8) is three times the diameter of the third expansion roller (3), and the third expansion roller (3) is in close contact with the canvas and is horizontally offset by 3-5 cm.

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