A new type of slow cooling device and its application

Abstract

The present invention belongs to the field of PVC calendered film production, and discloses a new type of slow cooling device and its application. The new type of slow cooling device is arranged between the embossing cooling device and the cooling device, and includes a telescopic rod, a support rod, a frame and a slow cooling roller arranged on the frame. The telescopic rod is hinged to the cooling device, and the support rod is hingedly connected to the telescopic rod. The bottom of the frame is fixed to one end of the support rod. A driving chassis is provided on one side of the frame, and a heating device is provided on the other side. The frame is hingedly connected to the cooling frame through the rightmost slow cooling roller. Application of the device: docking the slow cooling device with the embossing cooling device; adjusting the length of the telescopic rod of the slow cooling device so that the peeling point between the film and the slow cooling roller, the cutting point with the first cooling roller, and the hanging length of the film all meet the process requirements; turning on the slow cooling device for cooling; and entering the cooling device for cooling after leaving the slow cooling device. The device realizes the up and down adjustability of the slow cooling device, achieves a better slow cooling effect, and improves the quality of the PVC calendered film.

Description

Technical Field

[0001] The invention relates to the field of PVC calendering film production, and in particular to a novel slow cooling device and application thereof. Background Art

[0002] During the production process of PVC calendered film, the film needs to be drawn and embossed. Embossing is the process of embossing the film using an embossing steel rod. The longitudinal stretching during the drawing process and the pressing of the pattern on the film surface will reorient and rearrange the direction of the molecular chains, which will generate internal stress. If the film is cooled directly after drawing and embossing, the internal stress generated inside the film cannot be eliminated or weakened. Even after cooling and winding, the flatness and shrinkage of the film will change after being stored for a period of time. Therefore, in order to eliminate the internal stress and avoid sudden cooling during the subsequent cooling and shaping process, which will further generate excessive stress, a slow cooling device will be used before cooling and shaping to give the film better flatness, flatness and dimensional stability.

[0003] Existing slow cooling devices, such as Figure 3 and Figure 4 , which is to set several first slow cooling rollers with a smaller roller diameter than the cooling roller in front of the first group of cooling rollers in the cooling rack. When in use, cooling water is passed into the first slow cooling rollers. This slow cooling device also has a certain slow cooling effect, but the diameter of the first slow cooling roller is small, and the internal cooling water pipeline is relatively thin, which will cause blockage during use. This slow cooling structure has another major drawback, which is affected by the pattern period and the different diameters of the cooling roller and the embossing steel rod. Figure 3 The large diameter embossing roller shown, Figure 4 The small diameter embossing roller is shown in the figure. In these two cases, the actual peeling point position of the PVC calendered film and the first slow cooling roller ( Figure 3 As shown in A1, Figure 4 The A2) and the suspended line segments B1 and B2 of the PVC calendered film shown in the figure are not ideal. The suspended line segments of the film are too long, which is easy to cause shrinkage. Under the process requirements, the ideal actual peeling point position is A0±10mm, the ideal suspended line segment length is 50-80mm, and the tangent point C between the film and the first slow cooling roller is higher than A020-50mm. However, the existing slow cooling device cannot meet the above conditions. The slow cooling roller can only move forward or backward with the cooling rack, and the height cannot be adjusted. Summary of the invention

[0004] In view of the above situation, the purpose of the present invention is to provide a new type of slow cooling device and its application. Through reasonable structural settings and by adjusting the telescopic length of the telescopic rod, the adjustability of process parameters such as the peeling point between the film and the slow cooling roller, the hanging length of the film, and the tangent point between the film and the first slow cooling roller is achieved, which has a better slow cooling effect, improves the quality of the PVC calendered film, and is convenient for operators to operate, use and maintain.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] A novel slow cooling device includes an embossing cooling device, a cooling device and a slow cooling device. Cooling water is passed through the embossing steel rod in the embossing cooling device, and while the film is embossed with patterns, the film is also preliminarily cooled and shaped. The slow cooling device is arranged between the embossing cooling device and the cooling device, and the slow cooling device includes a telescopic rod, a support rod, a frame and a slow cooling roller arranged on the frame. The lower part of the telescopic rod is hinged to the lower left part of the cooling device, one end of the support rod is hingedly connected to the upper end of the telescopic rod, and the bottom of the frame is fixed to the end of the support rod away from the telescopic rod. A drive chassis is provided on one side of the frame, and a drive device is provided in the drive chassis for driving the rotation of the slow cooling roller. The drive device here is a conventional drive device in the art for driving the slow cooling roller. A heating device is provided on the side of the frame away from the drive chassis for heating the water passed into the slow cooling roller. The heating device here is a conventional heating wire, a heating plate, a heating block, etc., which are commonly used technical means in the field. The slow cooling roller plays a slow cooling role before the film enters the cooling machine for cooling. The diameter of the slow cooling roller is larger than the traditional one, but smaller than the cooling roller. Therefore, the diameter of the cooling water pipe in the slow cooling roller is larger than that in the traditional slow cooling roller, which reduces the occurrence of blockage. At the same time, the increase in the diameter of the cooling roller is also conducive to prolonging the residence time of the film on the cooling roller, which helps to weaken or even eliminate the internal stress of the film.

[0007] The front and rear ends of the rightmost slow cooling roller in the frame are fixed to the left side of the first cooling roller on the cooling frame through a fixing seat. Here, the rightmost slow cooling roller in the frame is adjacent to the cooling roller, which is fixed on the cooling frame and is located on the left side of the cooling roller, so the position of the rightmost slow cooling roller in the frame is fixed relative to the cooling roller. The frame is hingedly connected to the cooling frame through the rightmost slow cooling roller. Here, the frame is composed of two front and rear flat plates, and a crossbeam is provided between the two flat plates to connect and fix the two flat plates to make the frame structure more stable. Here, the frame can rotate clockwise or counterclockwise on a vertical plane around the rightmost slow cooling roller and with it as the center.

[0008] The slow cooling device structure realizes the adjustable position of the first slow cooling roller relative to the embossing rollers of different diameters through the extension and contraction of the telescopic rod, thereby achieving the ideal peeling point and the appropriate suspension length, thereby ensuring the accuracy of the position of the film when it is peeled off from the embossing roller and the suitability of the film suspension length. After the film is embossed, it enters the slow cooling roller from the embossing roller for slow cooling. During the process, bubbles may be generated between the film and the cooling roller. If the film is at a descending angle or the rising angle is too large, it is not conducive to the bubble discharge. Many times of use experience have shown that the line connecting the peeling point of the film and the embossing roller and the contact point of the film and the first slow cooling roller is at an angle of 15 to 25 degrees with the horizontal plane, ensuring that the film always enters the first slow cooling roller state in the form of an upward angle of 15 to 25 degrees, which is conducive to the discharge of bubbles and prevents the generation of bubbles between the film and the cooling roller, which will cause uneven thickness of the film surface and affect the quality of the produced film.

[0009] In order to minimize the hanging length of the film between two adjacent slow cooling rollers, preferably, the distance between two adjacent slow cooling rollers is 3-5mm. The frame and box structure are compact, and the distance between two adjacent slow cooling rollers is controlled within the range of 3-5mm, which ensures that the hanging length of the film between two adjacent slow cooling rollers is minimized and improves the efficiency of slow cooling.

[0010] In order to facilitate the operator to guide the film, preferably, the shaft head of the slow cooling roller close to the heating device is lengthened to facilitate the operator to guide the film. When the slow cooling device is slowly cooling the film, the film needs to be manually guided to each slow cooling roller. Because the spacing between the slow cooling rollers is small, it is inconvenient for the operator to guide the film on the slow cooling roller. The shaft head of the slow cooling roller is thinner and has a smaller diameter. Therefore, the shaft head of the slow cooling roller close to one side is lengthened. Because a drive chassis is provided on one side of the slow cooling roller, the drive chassis occupies a certain space, which is not convenient for the operator to guide the film. Therefore, the film guiding operation is performed on the heating side of the slow cooling roller. During the film guiding process, the operator can pass the palm through the gap between the shaft heads to facilitate the film guiding operation.

[0011] In order to ensure the safety of film guiding, prevent the operator from contacting and scalding the heating device, and make the film guiding operation more convenient for the operator, it is further preferred that the top of the frame near the heating device is provided with a placement plate to prevent the operator from contacting and scalding the heating device. Because the heating device heats the cooling water entering the slow cooling roller, there is a risk of scalding when it comes into contact with human skin. Therefore, a placement plate is provided to prevent the operator from contacting and scalding during the film guiding process, and also to provide a support point for the operator's arm during the manual film guiding process, making the film guiding operation more convenient.

[0012] In order to reduce the weight of the slow cooling device and make it stable and not shake during use, preferably, the material of the driving chassis is cast aluminum. In order to reduce the overall weight of the slow cooling device and avoid the phenomenon of top-heavy, which causes the device to shake and further affects the arrangement of molecular chains during the film slow cooling process and the quality of the film, the driving chassis is made of cast aluminum. Because aluminum is relatively light among metal materials, it can reduce the overall weight of the device to a certain extent. In order to further prevent the phenomenon of top-heavy, the frame can adjust the thickness of the plates on both sides of the frame according to the site and production requirements.

[0013] In order to ensure that the slow cooling device is stable during the slow cooling process and does not shake left and right, preferably, the leftmost end of the frame is hinged with blocks on both sides, a horizontal baffle is provided at the bottom of the hinge, and a slot matching the two blocks is provided at the rightmost end of the embossed cooling device. During the process of adjusting the position of the slow cooling device frame and moving up and down, the horizontal baffle can keep the block horizontal during the rotation process. Because the block will move up and down with the frame, the leftmost head of the frame will also move accordingly. Therefore, the setting of the baffle can keep the block in a horizontal state continuously. The slot here is longer in the vertical direction, and the block can be docked into the slot within its vertical moving range. The cooperation between the slot and the block can effectively avoid shaking in the film production process. When cooling the embossed film, the cooling machine moves toward the embossed cooling device, and the slow cooling device docks with the embossed cooling device. When the device is deactivated, the block can be naturally separated from the slot, so as not to affect the separation of the embossed cooling device and the slow cooling device.

[0014] In order to make the slow cooling device and the embossing cooling device cooperate better and make the slow cooling device more stable during the slow cooling process, it is further preferred that an electric push rod is provided at the bottom of the card slot, and a moving block matching the card slot is provided at the free end of the electric push rod. The length of the card slot in the vertical direction is relatively long here, so as to ensure that the card block can be inserted into the card slot during the movement of the slow cooling device frame. A support seat for the electric push rod is provided at the bottom of the card slot, and the base of the electric push rod is fixed on the support seat. A moving block matching the card slot is provided at the free end. After the slow cooling device and the embossing cooling device are docked, the electric push rod is extended so that the moving block reaches the bottom of the card block and fits with the horizontal baffle at the bottom thereof, so as to limit the shaking of the bottom of the card block, and further enhance the stability of the slow cooling device during application.

[0015] The application of the new slow cooling device, the slow cooling steps are as follows: move the slow cooling device to connect with the embossing cooling device; adjust the length of the telescopic rod of the slow cooling device so that the peeling point between the PVC calendered film and the slow cooling roller, the cutting point with the first cooling roller and the suspended length of the PVC calendered film all meet the process requirements, and make the PVC calendered film rise at an angle of 15 to 25 degrees from the embossing roller of the embossing cooling device to the first slow cooling roller of the slow cooling device; turn on the slow cooling device, and the slow cooling roller rotates at a uniform speed; after the PVC calendered film is embossed by the embossing cooling device, it is introduced into the slow cooling device and driven by the slow cooling roller for slow cooling; after the PVC calendered film leaves the slow cooling device, it enters the cooling device for cooling.

[0016] The present invention also includes other components that enable the new slow cooling device and application to be used normally, which are all conventional choices in the art. In addition, the devices or components not limited in the present invention all adopt conventional means in the art, for example, telescopic rods, electric push rods, embossing cooling devices, slow cooling rollers and cooling rollers, hinged connections, etc. can all be arranged according to the prior art.

[0017] The beneficial effects of a novel slow cooling device and its application of the present invention are as follows: the height of the slow cooling device can be adjusted according to the process production conditions by moving and retracting the telescopic rod, and then the horizontal and vertical heights of the slow cooling roller move accordingly, so that the peeling point between the film and the slow cooling roller, the suspended length of the film and the tangent point between the film and the first slow cooling roller meet the process requirements; it is easy to operate, and only the length of the telescopic rod needs to be adjusted to achieve the adjustment of the peeling point, the suspended length and the tangent point between the film and the first slow cooling roller in the process indicators.

[0018] The present invention reasonably arranges a new type of slow cooling device to achieve the adjustability of process parameters such as the peeling point between the film and the slow cooling roller, the hanging length of the film and the tangent point between the film and the first slow cooling roller, thereby achieving a better slow cooling effect, improving the quality of the PVC calendered film, and facilitating operation, use and maintenance by operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of a novel slow cooling device according to an embodiment.

[0020] Figure 2 for Figure 1 Schematic diagram of the slot structure of the embossed cooling device.

[0021] Figure 3 It is a schematic diagram of the structure of an existing large-diameter embossing roller and a slow cooling device.

[0022] Figure 4 It is a schematic diagram of the structure of an existing small-diameter embossing roller and a slow cooling device.

[0023] Figure numerals: 1, embossing cooling device; 2, slow cooling device; 3, cooling device; 201, telescopic rod; 202, support rod; 203, frame; 204, slow cooling roller; 205, fixed seat; 206, first slow cooling roller; 301, cooling roller; 302, cooling frame, 4, clamping block; 5, clamping slot; 6, electric push rod; 7, moving block. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0025] Example

[0026] like Figure 1-2 As shown, a novel slow cooling device comprises an embossing cooling device 1, a cooling device 3 and a slow cooling device 2, wherein the slow cooling device 2 is arranged between the embossing cooling device 1 and the cooling device 3, and is characterized in that: the slow cooling device 2 comprises a telescopic rod 201, a support rod 202, a frame 203 and a slow cooling roller 204 arranged on the frame 203, the lower part of the telescopic rod 201 is hinged to the lower left part of the cooling device 3, one end of the support rod 202 is hinged to the upper end of the telescopic rod 201, and the bottom of the frame 203 is fixed to the support rod 2 02 is away from one end of the telescopic rod 201, and a driving chassis is provided on one side of the frame 203. A driving device is provided in the driving chassis for driving the rotation of the slow cooling roller. A heating device is provided on the side of the frame 203 away from the driving chassis for heating the water entering the slow cooling roller. The front and rear ends of the rightmost slow cooling roller 204 in the frame 203 are fixed to the left side of the first cooling roller 301 on the cooling frame 302 through a fixing seat 205. The frame 203 is hingedly connected to the cooling frame 302 through the rightmost slow cooling roller 204.

[0027] The distance between two adjacent slow cooling rollers 204 is 3-5 mm.

[0028] The shaft head of the slow cooling roller 204 close to the heating device is lengthened to facilitate the operator to guide the film.

[0029] The frame 203 is provided with a placement plate on the top of one side close to the heating device to prevent operators from coming into contact with the heating device and getting burned.

[0030] The drive chassis is made of cast aluminum.

[0031] The left end of the frame 203 is hinged with blocks 4 on both sides, and a horizontal baffle is provided at the bottom of the hinge. The rightmost end of the embossing cooling device is provided with a slot 5 matching the two blocks 4. The bottom of the slot 5 is provided with an electric push rod 6, and the free end of the electric push rod 6 is provided with a moving block 7 matching the slot 5.

[0032] The application of the new slow cooling device includes: moving the slow cooling device 2 to dock with the embossing cooling device 1; adjusting the length of the telescopic rod 201 of the slow cooling device 2 so that the peeling point between the PVC calendered film and the slow cooling roller 204, the cutting point with the first cooling roller 301 and the suspended length of the PVC calendered film all meet the process requirements, and the PVC calendered film rises at an angle of 15 to 25 degrees from the embossing roller of the embossing cooling device 1 to the first slow cooling roller 204 of the slow cooling device 2; turning on the slow cooling device 2, and the slow cooling roller 204 rotates at a uniform speed; after the PVC calendered film is embossed by the embossing cooling device 1, it is introduced into the slow cooling device 2 and driven by the slow cooling roller 204 for slow cooling; after the PVC calendered film leaves the slow cooling device 2, it enters the cooling device 3 for cooling.

[0033] The beneficial effects of a novel slow cooling device and its application of the present invention are as follows: the height of the slow cooling device can be adjusted according to the process production conditions by moving and retracting the telescopic rod, and then the horizontal and vertical heights of the slow cooling roller move accordingly, so that the peeling point between the film and the slow cooling roller, the suspended length of the film and the tangent point between the film and the first slow cooling roller meet the process requirements; it is easy to operate, and only the length of the telescopic rod needs to be adjusted to achieve the adjustment of the peeling point, the suspended length and the tangent point between the film and the first slow cooling roller in the process indicators.

[0034] The present invention reasonably arranges a new type of slow cooling device and adjusts the telescopic length of the telescopic rod to achieve the adjustability of process parameters such as the peeling point between the film and the slow cooling roller, the hanging length of the film, and the tangent point between the film and the first slow cooling roller, thereby achieving a better slow cooling effect, improving the quality of the PVC calendered film, and facilitating operation, use and maintenance by operators.

[0035] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A novel slow cooling device, comprising an embossing cooling device, a cooling device and a slow cooling device, wherein the slow cooling device is arranged between the embossing cooling device and the cooling device, and is characterized in that: The slow cooling device includes a telescopic rod, a support rod, a frame and a slow cooling roller arranged on the frame, the lower part of the telescopic rod is hinged to the lower left part of the cooling device, one end of the support rod is hingedly connected to the upper end of the telescopic rod, the bottom of the frame is fixed to the end of the support rod away from the telescopic rod, one side of the frame is provided with a driving chassis, the driving chassis is provided with a driving device for driving the rotation of the slow cooling roller, the side of the frame away from the driving chassis is provided with a heating device for heating the water passed into the slow cooling roller, the front and rear ends of the rightmost slow cooling roller in the frame are fixed to the left side of the first cooling roller on the cooling frame through a fixing seat, and the frame is hingedly connected to the cooling frame through the rightmost slow cooling roller; The left end of the frame is hinged with blocks on both sides, a horizontal baffle is provided at the bottom of the hinge, and a slot matching the two blocks is provided at the rightmost end of the embossed cooling device; an electric push rod is provided at the bottom of the slot, and a moving block matching the slot is provided at the free end of the electric push rod; The distance between two adjacent slow cooling rollers is 3 to 5 mm.

2. A novel slow cooling device according to claim 1, characterized in that: The shaft head of the slow cooling roller close to the heating device is lengthened to facilitate film guiding by operators.

3. A novel slow cooling device according to claim 2, characterized in that: The frame is provided with a placement plate on the top of one side close to the heating device, so as to prevent the operator from being scalded by contact with the heating device.

4. A novel slow cooling device according to claim 1, characterized in that: The material of the driving chassis is cast aluminum.

5. Application of the novel slow cooling device according to any one of claims 1 to 4, characterized in that: Move the slow cooling device to dock with the embossing cooling device; adjust the length of the telescopic rod of the slow cooling device so that the peeling point between the PVC calendered film and the slow cooling roller, the cutting point with the first cooling roller and the suspended length of the PVC calendered film all meet the process requirements, and make the PVC calendered film rise at an angle of 15 to 25 degrees from the embossing roller of the embossing cooling device to the first slow cooling roller of the slow cooling device; turn on the slow cooling device, and rotate the slow cooling roller at a uniform speed; after the PVC calendered film is embossed by the embossing cooling device, it is introduced into the slow cooling device and driven by the slow cooling roller for slow cooling; After leaving the slow cooling device, the PVC calendered film enters the cooling device for cooling.

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