A rapid cooling and shaping device for PP plate production

Abstract

The utility model relates to PP board production technical field, concretely relates to a quick cooling and shaping device for PP board production. Two assembly frames of upper and lower arrangement are included, and the inside horizontal array rotation of assembly frame is installed with a plurality of hollow rollers. The utility model, through the synchronous reverse rotation of the hollow roller of upper and lower arrangement under the drive mechanism drive, the PP board moves with the help of friction force, and the circulating flow of the cold water output of industrial water chiller in the hollow roller, the heat exchange time is guided and prolonged by helical guide vane, thereby efficiently reducing the roller body temperature, realizing the overall uniform cooling of the upper and lower sidewall of PP board, when the PP board enters between the hollow rollers, the reset spring of first lower pressing assembly and second lower pressing assembly is compressed to produce the resilience, jointly pushes the upper assembly frame to move down, makes the upper and lower hollow rollers closely adhere to the PP board surface, applies constant pressure, restrains the deformation of PP board due to the shrinkage caused by cooling, ensures the shaping stability and surface finish.

Description

Technical Field

[0001] This utility model relates to the field of PP board production technology, and more specifically, to a rapid cooling and shaping device for PP board production. Background Technology

[0002] PP sheet, or polypropylene sheet, is a type of plastic sheet made by extruding polypropylene resin through a flat die after it has been melted and plasticized at high temperatures. It has excellent chemical stability, heat resistance, and mechanical strength, and is widely used in chemical storage tank linings, advertising decoration, electronic environmental protection equipment, and other fields. During the extrusion molding process, PP sheet is in a high-temperature molten state and must be rapidly cooled to fix its size and shape in order to obtain ideal surface finish, dimensional stability, and mechanical properties. If the cooling is not done properly, the sheet is prone to warping, deformation, uneven internal crystallization, and other problems, which seriously affect product quality.

[0003] Currently, the industry mostly uses a combination of single-sided cooling rollers and cooling water tanks to cool PP sheets. Specifically, after the high-temperature sheet is extruded from the die, it first passes through a few large-diameter cooling rollers for initial cooling and traction on its lower surface, and then enters an open cooling water tank for natural floating cooling. This traditional method has the following drawbacks: First, the cooling rollers only contact the lower surface of the sheet, resulting in uneven cooling rates and shrinkage rates between the upper and lower surfaces, generating huge internal stress, which is the main cause of warping and deformation of the sheet after use. Second, the sheet in the water tank is in a free state and lacks effective restraint. Under its own weight and internal stress, it is prone to irregular deformation. Moreover, the heat exchange efficiency of the open water tank is low, and a long cooling distance is often required to achieve the desired shaping effect, which restricts the speed of the production line and occupies a lot of factory space.

[0004] In addition, a large number of water droplets will adhere to the surface of the board after it comes out of the water tank. A separate drying process must be added before subsequent rolling or cutting can be carried out. This not only increases equipment and energy costs, but also easily leads to water stains due to incomplete drying, which affects the appearance of the product. Utility Model Content

[0005] The purpose of this invention is to provide a rapid cooling and shaping device for PP board production, so as to solve the problems mentioned in the background art.

[0006] To address the above problems, this utility model aims to provide a rapid cooling and shaping device for PP board production, comprising two vertically arranged assembly frames. Several hollow rollers are rotatably mounted in a horizontal array inside each assembly frame. Both ends of each hollow roller rotatably pass through the assembly frame and are equipped with rotary joints. A drive mechanism for synchronously rotating all the hollow rollers is provided on one side of each assembly frame. Conveying pipes are fixedly mounted on both sides of the lower assembly frame via brackets. A sealing cap is fixedly mounted on one end of each conveying pipe. The ends of the two conveying pipes furthest from the sealing caps are respectively used to connect to the input and output pipes of an external industrial chiller. The upper rotary joint is connected to the top of the corresponding conveying pipe via a corrugated flexible hose, and the lower rotary joint is connected to the bottom of the corresponding conveying pipe via a stainless steel pipe. First pressing components are provided on both sides of the upper rotary joint, and second pressing components are provided at the four corners between the two assembly frames. Both the first and second pressing components are used to press down on the upper assembly frame.

[0007] As a further improvement to this technical solution, the first pressing component includes an extension rod fixedly installed on one side of the rotary joint, a vertically arranged first sliding rod fixedly installed at the other end of the extension rod, and a gantry frame fixedly installed at the top of the conveying pipe at a position corresponding to the extension rod.

[0008] As a further improvement to this technical solution, the upper end of the first slide rod slides through the top of the portal frame and extends upward. A first return spring is provided between the upper side wall of the extension rod and the inner top side of the portal frame, and the first return spring is used to push the extension rod to move downward.

[0009] As a further improvement to this technical solution, the second pressing component includes a second slide rod that is vertically fixedly installed on the upper side wall of the lower assembly frame. The upper end of the second slide rod slides through the upper assembly frame and is fixedly installed with an end cap.

[0010] As a further improvement to this technical solution, a second return spring is provided between the upper assembly frame and the end cap, which is sleeved on the second slide rod. The second return spring is used to push the upper assembly frame to move downward.

[0011] As a further improvement to this technical solution, a spiral guide vane is fixedly installed inside the hollow roller, with both ends of the spiral guide vane extending to both ends of the hollow roller.

[0012] As a further improvement to this technical solution, the driving mechanism includes several chains respectively arranged between two adjacent hollow rollers. A sprocket is coaxially fixedly installed on the hollow roller at a position corresponding to the chain, and the chain is drivenly connected to the two corresponding sprockets.

[0013] As a further improvement to this technical solution, a speed reducer is fixedly mounted on the assembly frame via a mounting bracket. A servo motor for driving the speed reducer input shaft to rotate is fixedly mounted on the speed reducer. A drive gear is coaxially fixedly mounted on the output shaft of the speed reducer, and a driven gear is coaxially fixedly mounted on one of the hollow rollers. The driven gear meshes with the drive gear.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This rapid cooling and shaping device for PP board production uses hollow rollers arranged vertically to rotate synchronously in opposite directions under the drive mechanism. The friction force pulls the PP board to move, while the chilled water output from the industrial chiller circulates inside the hollow rollers. The spiral guide vanes guide the flow to extend the heat exchange time, thereby efficiently reducing the roller body temperature and achieving comprehensive and uniform cooling of the upper and lower sidewalls of the PP board. When the PP board enters between the hollow rollers, the return springs of the first and second pressing components are compressed and generate a rebound force, which together pushes the upper assembly frame to move down, so that the upper and lower hollow rollers are tightly attached to the surface of the PP board, applying constant pressure to suppress the deformation of the PP board caused by cooling and shrinkage, ensuring stable shaping and surface smoothness. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the overall structure of this utility model; Figure 3 For the present utility model Figure 1 Enlarged view of the structure at point A in the middle; Figure 4 For the present utility model Figure 1 Enlarged view of the structure at point B; Figure 5 This is one of the partial structural schematic diagrams of this utility model; Figure 6 This is the second partial structural schematic diagram of this utility model.

[0016] The meanings of the labels in the diagram are as follows: 1. Assembly rack; 2. Hollow roller; 21. Spiral guide vane; 3. Rotary joint; 4. Conveying pipe; 41. Sealing cap; 5. Corrugated flexible hose; 6. Stainless steel pipe; 7. Drive mechanism; 71. Sprocket; 72. Chain; 73. Reducer; 74. Servo motor; 75. Drive gear; 76. Driven gear; 8. First pressing assembly; 81. Extension rod; 82. Gantry frame; 83. First sliding rod; 84. First return spring; 9. Second pressing assembly; 91. Second slide bar; 92. End cap; 93. Second return spring. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Example 1 Please see Figure 1 As shown, the purpose of this embodiment is to provide a rapid cooling and shaping device for PP board production, including two assembly frames 1 arranged vertically. Several hollow rollers 2 are rotatably mounted in a horizontal array inside the assembly frame 1. A drive mechanism 7 for driving all hollow rollers 2 to rotate synchronously is provided on one side of the assembly frame 1.

[0019] The structure of the drive mechanism 7 is described in detail below, with reference to... Figure 5 and Figure 6 The drive mechanism 7 includes several chains 72 respectively disposed between two adjacent hollow rollers 2. Sprockets 71 are coaxially fixedly installed on the hollow rollers 2 at positions corresponding to the chains 72. Each chain 72 meshes with two corresponding sprockets 71. A reducer 73 is fixedly installed on the assembly frame 1 via a mounting bracket. A servo motor 74 for driving the input shaft of the reducer 73 is fixedly installed on the reducer 73. A drive gear 75 is coaxially fixedly installed on the output shaft of the reducer 73. A driven gear 76 is coaxially fixedly installed on one of the hollow rollers 2. The driven gear 76 meshes with the drive gear 75.

[0020] When the servo motor 74 starts, its output shaft drives the input shaft of the reducer 73 to rotate. After the reducer 73 reduces the speed and increases the torque, it drives the drive gear 75 to rotate. Through the meshing transmission between the drive gear 75 and the driven gear 76, the corresponding hollow roller 2 is driven to rotate. The sprocket 71 on the hollow roller 2 rotates accordingly, and then through the chain 72, all the hollow rollers 2 in the same assembly frame 1 rotate synchronously.

[0021] Both ends of the hollow roller 2 rotate through the assembly frame 1 and are equipped with rotary joints 3. Both sides of the lower assembly frame 1 are fixedly installed with conveying pipes 4 by brackets. One end of the conveying pipe 4 is fixedly installed with a sealing cap 41. The other ends of the two conveying pipes 4 are respectively connected to the input pipe and output pipe of the external industrial chiller. The upper rotary joint 3 is connected to the top of the corresponding conveying pipe 4 by a corrugated hose 5, and the lower rotary joint 3 is connected to the bottom of the corresponding conveying pipe 4 by a stainless steel pipe 6.

[0022] The chilled water output from the industrial chiller enters the corresponding conveying pipe 4 through the output pipe, and then flows into the interior of all hollow rollers 2 through the corrugated hose 5 and stainless steel pipe 6 respectively. After flowing through the hollow rollers 2, the chilled water enters another conveying pipe 4 through the corrugated hose 5 and stainless steel pipe 6, and finally flows back to the industrial chiller, forming a circulating cooling loop.

[0023] Reference Figure 2 A spiral guide vane 21 is fixedly installed inside the hollow roller 2. The two ends of the spiral guide vane 21 extend to the two ends of the hollow roller 2 respectively. When cold water flows inside the hollow roller 2, the spiral guide vane 21 guides the cold water to flow along the spiral path, prolonging its residence time inside the hollow roller 2, thereby improving the heat exchange efficiency between the cold water and the hollow roller 2 and achieving efficient cooling of the roller body of the hollow roller 2.

[0024] The upper rotary joint 3 is provided with a first pressing component 8 on both sides, and a second pressing component 9 is provided at each of the four corners between the two assembly frames 1. The first pressing component 8 and the second pressing component 9 are both used to press down the upper assembly frame 1.

[0025] When this device is installed in the production line, and the PP sheet enters between the upper and lower hollow rollers 2, the first pressing component 8 and the second pressing component 9 apply pressure together, causing the upper assembly frame 1 to move downward. This allows the upper and lower hollow rollers 2 to make close contact with the upper and lower surfaces of the PP sheet. The two drive mechanisms 7 drive the upper and lower sets of hollow rollers 2 to rotate in opposite directions. With the help of the friction between the hollow rollers 2 and the PP sheet, the PP sheet is moved from one side of the assembly frame 1 to the other side. During this process, the low-temperature hollow roller 2 body makes full contact with the PP sheet, achieving uniform cooling on both sides through efficient heat exchange. This structure not only has a large cooling area and high efficiency, but also reduces internal stress and warping deformation caused by temperature differences. At the same time, it applies constant and uniform pressure to the PP sheet during the cooling process, which helps to improve the shaping effect and surface smoothness.

[0026] The structure of the first pressing component 8 is described in detail below, referring to... Figure 3 The first pressing component 8 includes an extension rod 81 fixedly installed on one side of the rotary joint 3. A vertically arranged first slide rod 83 is fixedly installed at the other end of the extension rod 81. A gantry frame 82 is fixedly installed at the top of the conveying pipe 4 at a position corresponding to the extension rod 81. The upper end of the first slide rod 83 slides through the top of the gantry frame 82 and extends upward. A first return spring 84 is provided between the upper side wall of the extension rod 81 and the inner top side of the gantry frame 82 and sleeved on the first slide rod 83. The first return spring 84 is used to push the extension rod 81 to move downward.

[0027] The structure of the second pressing component 9 is described in detail below, referring to... Figure 4The second pressing component 9 includes a second slide rod 91 that is vertically fixedly installed on the upper side wall of the lower assembly frame 1. The upper end of the second slide rod 91 slides through the upper assembly frame 1 and is fixedly installed with an end cap 92. A second return spring 93 is provided between the upper assembly frame 1 and the end cap 92 and sleeved on the second slide rod 91. The second return spring 93 is used to push the upper assembly frame 1 to move downward.

[0028] In the initial state, the two assembly frames 1 are in close contact with each other, and the distance between the two corresponding hollow rollers 2 is less than the thickness of the PP board. When the PP board enters between the upper and lower hollow rollers 2, it will push the upper hollow roller 2 upward, causing the upper assembly frame 1 to move upward. At this time, the distance between the upper assembly frame 1 and the end cap 92 is reduced, and the second return spring 93 is compressed and contracted. At the same time, the rotary joint 3 and the extension rod 81 move upward with the assembly frame 1, reducing the distance between the extension rod 81 and the inner top side of the portal frame 82. The first return spring 84 is also compressed and contracted. The rebound force of the first return spring 84 and the second return spring 93 together push the upper assembly frame 1 downward, causing its internal hollow rollers 2 to press down synchronously, ensuring that the upper and lower hollow rollers 2 are tightly in contact with the upper and lower sidewalls of the PP board, thus achieving comprehensive cooling of the upper and lower sidewalls of the PP board.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A rapid cooling and shaping device for PP board production, comprising two assembly racks (1) arranged vertically, characterized in that: The assembly frame (1) has several hollow rollers (2) rotatably mounted in a transverse array inside. Both ends of the hollow rollers (2) rotatably pass through the assembly frame (1) and are equipped with rotary joints (3). A drive mechanism (7) for driving all the hollow rollers (2) to rotate synchronously is provided on one side of the assembly frame (1). Both sides of the lower assembly frame (1) are fixedly mounted with conveying pipes (4) by brackets. A sealing cap (41) is fixedly mounted on one end of the conveying pipe (4). The ends of the two conveying pipes (4) away from the sealing cap (41) are respectively used to connect with the outside. The input and output pipes of the industrial chiller are connected. The upper rotary joint (3) is connected to the top of the corresponding conveying pipe (4) through a corrugated hose (5). The lower rotary joint (3) is connected to the bottom of the corresponding conveying pipe (4) through a stainless steel pipe (6). The upper rotary joint (3) is provided with a first pressing component (8) on both sides. The two mounting frames (1) are provided with a second pressing component (9) at the four corners. The first pressing component (8) and the second pressing component (9) are both used to press down the upper mounting frame (1).

2. The rapid cooling and shaping device for PP board production according to claim 1, characterized in that: The first pressing assembly (8) includes an extension rod (81) fixedly installed on one side of the rotary joint (3), and a vertically arranged first slide rod (83) fixedly installed at the other end of the extension rod (81). A gantry frame (82) is fixedly installed at the top of the conveying pipe (4) at a position corresponding to the extension rod (81).

3. The rapid cooling and shaping device for PP board production according to claim 2, characterized in that: The upper end of the first slide rod (83) slides through the top of the portal frame (82) and extends upward. A first return spring (84) is provided between the upper side wall of the extension rod (81) and the inner top side of the portal frame (82). The first return spring (84) is used to push the extension rod (81) to move downward.

4. The rapid cooling and shaping device for PP board production according to claim 1, characterized in that: The second pressing component (9) includes a second slide rod (91) that is vertically fixedly installed on the upper side wall of the lower assembly frame (1). The upper end of the second slide rod (91) slides through the upper assembly frame (1) and is fixedly installed with an end cap (92).

5. The rapid cooling and shaping device for PP board production according to claim 4, characterized in that: A second return spring (93) is provided between the upper assembly frame (1) and the end cap (92) and is sleeved on the second slide rod (91). The second return spring (93) is used to push the upper assembly frame (1) to move downward.

6. The rapid cooling and shaping device for PP board production according to claim 1, characterized in that: The hollow roller (2) is fixedly installed with a spiral guide plate (21), and the two ends of the spiral guide plate (21) extend to the two ends of the hollow roller (2).

7. The rapid cooling and shaping device for PP board production according to claim 1, characterized in that: The drive mechanism (7) includes several chains (72) respectively arranged between two adjacent hollow rollers (2). A sprocket (71) is coaxially fixedly installed on the hollow roller (2) at a position corresponding to the chain (72). The chain (72) is connected to the corresponding two sprockets (71) for transmission.

8. The rapid cooling and shaping device for PP board production according to claim 7, characterized in that: A speed reducer (73) is fixedly mounted on the assembly frame (1) via a mounting bracket. A servo motor (74) for driving the input shaft of the speed reducer (73) is fixedly mounted on the speed reducer (73). A drive gear (75) is coaxially fixedly mounted on the output shaft of the speed reducer (73). A driven gear (76) is coaxially fixedly mounted on one of the hollow rollers (2). The driven gear (76) meshes with the drive gear (75).

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