Internal cooling device and internal cooling method for epe foamed slabs

Abstract

This invention relates to an internal cooling device and method for EPE foamed thick sheets, belonging to the technical field of EPE plastic sheet production equipment. The device includes a frame on which a vertically movable cooling chain assembly is mounted, driven by a drive device. The cooling chain assembly is ring-shaped and consists of several hinged cooling chain plates. Each cooling chain plate has a hollow cavity, and cooling pins are movably disposed within the cooling chain plates. Each cooling pin has a variable-diameter through-hole and a movable sealing slider. Cold air chambers and vacuum chambers are located on both sides of the cooling chain assembly, and the cooling chain assembly slides in contact with these chambers. This invention uses cooling pins inserted into the interior of the EPE foamed thick sheet to blow in cold air, effectively cooling the interior of the EPE foamed thick sheet and avoiding product quality issues caused by poor internal cooling of the foamed thick sheet.

Description

Technical Field

[0001] This invention relates to an internal cooling device and method for EPE foamed thick sheets, belonging to the technical field of EPE plastic sheet production equipment. Background Technology

[0002] EPE foamed sheet is a foamed material made of low-density polyethylene (LDPE) with an independent bubble structure, thus possessing excellent cushioning, heat insulation, sound insulation, and impact resistance properties. EPE foamed sheet is commonly used for packaging electronic products, instruments, furniture, etc., to prevent damage during transportation.

[0003] After production, EPE foam thick sheets need to be cooled to solidify their shape and achieve the required physical properties. Currently, the cooling of EPE foam thick sheets is mostly achieved by sizing barrel cooling or roller cooling. However, these cooling methods can only cool the surface of the EPE foam thick sheets, and cannot quickly cool the interior of the foam thick sheets. This causes the produced EPE foam thick sheets to shrink due to poor internal cooling, which seriously affects the quality of the product. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide an internal cooling device and internal cooling method for EPE foamed thick plates, which uses cooling pins inserted into the EPE foamed thick plates to blow cold air to cool the interior of the EPE foamed thick plates, thereby avoiding the problem of product quality being affected by poor internal cooling effect of the foamed thick plates.

[0005] The internal cooling device for EPE foamed thick plate of the present invention includes a frame, on which a cooling chain assembly that can move up and down is installed, and the cooling chain assembly is driven by a drive device; the cooling chain assembly is ring-shaped and is composed of several cooling chain plates hinged together, the cooling chain plates are provided with hollow cavities, and cooling pins are movably arranged in the cooling chain plates, the cooling pins are provided with variable diameter through holes and movable sealing sliders.

[0006] The cooling chain assembly has a cold air chamber and a vacuum chamber on both sides, and the cooling chain assembly slides in contact with the cold air chamber and the vacuum chamber. The cold air chamber can blow cold air into the EPE foamed thick plate through the cooling chain assembly and cooling pins. The vacuum chamber is used to create negative pressure and remove the heated air from the EPE foamed thick plate.

[0007] Preferably, the frame is equipped with a lift, which is connected to a drive device and can drive the drive device to move up and down, thereby adjusting the thickness of the EPE foamed sheet.

[0008] Preferably, there are two sets of cooling chain groups, which are arranged in parallel vertically. During operation, the EPE foamed thick plate is placed between the two sets of cooling chain groups, and the two sets of cooling chain groups work together to move the EPE foamed thick plate backward.

[0009] Preferably, the cold air chamber includes a high-pressure cold air chamber and a low-pressure cold air chamber, and the vacuum chamber includes a high-pressure vacuum chamber and a low-pressure vacuum chamber; the low-pressure cold air chamber, the high-pressure cold air chamber, the low-pressure vacuum chamber, and the high-pressure vacuum chamber are arranged in sequence from front to back.

[0010] Furthermore, one end of both the cold air chamber and the vacuum chamber is movably connected to a guide shaft. The guide shaft is fixed to a fixed block on the frame, and a compression spring is sleeved on the guide shaft. The compression spring pushes the cold air chamber so that it is always in contact with the cooling chain assembly, continuously blowing cold air into the cooling chain plate, while also serving a sealing function.

[0011] Preferably, the cooling pin includes a needle tube and a needle seat. The needle seat has an opening at the top and a variable diameter through hole inside. A sealing slider is movably disposed in the variable diameter through hole, and the diameter of the sealing slider is equal to the minimum diameter of the variable diameter through hole. An upper spring is connected above the sealing slider, and a lower spring is connected below the sealing slider. The sealing slider moves under the action of air pressure, the upper spring, and the lower spring, thereby realizing the conduction and cutoff of gas and driving the cooling pin to move in the cavity of the cooling chain plate.

[0012] The present invention relates to an internal cooling method based on the internal cooling device for the aforementioned EPE foamed thick plate, comprising the following steps:

[0013] S1. Place the EPE foamed thick plate between the two cooling chain groups, and drive the cooling chain groups to move, thereby moving the EPE foamed thick plate backward.

[0014] S2. The cooling chain plate moves to contact the low-pressure cold air box, and the low-pressure cold air box blows low-pressure cold air into the cooling chain plate, so that the cooling pins are inserted into the interior of the EPE foam thick plate.

[0015] S3. The cooling chain plate continues to move until it contacts the high-pressure cold air box. The high-pressure cold air box blows high-pressure cold air into the cooling chain plate. The high-pressure cold air enters the interior of the EPE foam thick plate through the cooling pin and cools its interior.

[0016] S4. The cooling chain plate continues to move until it contacts the low-pressure vacuum chamber. The low-pressure vacuum chamber generates a slight negative pressure, which removes the heated air from inside the EPE foam thick plate.

[0017] S5. The cooling chain plate continues to move until it contacts the high-pressure vacuum chamber. The high-pressure vacuum chamber generates a high negative pressure, causing the cooling pins to be extracted from the EPE foam thick plate.

[0018] S6. The cooling chain continues to convey the EPE foamed thick sheet backward, and as the cooling chain rotates, it continuously cools the EPE foamed thick sheet.

[0019] Furthermore, in step S2, when the low-pressure cold air box blows low-pressure cold air into the cooling chain plate, the sealing slider in the cooling pin is in position C. At this time, the gas is not connected, and the cooling pin moves within the cooling chain plate under force and is inserted into the EPE foam thick plate.

[0020] Furthermore, in step S3, when the high-pressure cold air box blows high-pressure cold air into the cooling chain plate, the lower spring is compressed, and the sealing slider reaches position D. At this time, the gas is connected, and the cold air enters the interior of the EPE foamed thick plate for cooling.

[0021] Furthermore, in step S4, when the low-pressure vacuum chamber generates a slight negative pressure, the upper spring is compressed, and the sealing slider reaches position B. At this time, the vacuum is activated, and the cooling pin extracts the air that has become hot inside the EPE foamed thick plate.

[0022] Furthermore, in step S5, when the high-pressure vacuum chamber generates a high negative pressure, the upper spring is further compressed, the sealing slider reaches position A, at which point the variable diameter through hole is blocked, the cooling pin is subjected to force as a whole, and is pulled out from the EPE foam thick plate.

[0023] The beneficial effects of this invention compared to the prior art are:

[0024] This invention employs a cooling pin inserted into the interior of an EPE foamed thick sheet to blow in cold air, thereby cooling the interior of the EPE foamed thick sheet. This effectively avoids product quality issues caused by poor cooling inside the foamed thick sheet. During operation, the cooling chain assembly first presses down the EPE foamed thick sheet, and after both operate synchronously, the cooling pin is inserted into the interior of the EPE foamed thick sheet. After cooling is completed, the cooling pin is first withdrawn from the EPE foamed thick sheet, and then the cooling chain plate releases the EPE foamed thick sheet. This prevents the pin from being broken and minimizes damage to the surface of the EPE foamed thick sheet. Attached Figure Description

[0025] Figure 1 This is a sectional view of the main view of the present invention;

[0026] Figure 2 This is a top view of the present invention;

[0027] Figure 3 This is a schematic diagram of the connection structure between the high-pressure cold air chamber and the cooling chain plate;

[0028] Figure 4 It is a 3D view of the cooling pins;

[0029] Figure 5 This is a cross-sectional view of the cooling pins.

[0030] In the diagram: 1. Frame; 11. Compression spring; 12. Guide shaft; 2. Cooling chain assembly; 21. Cooling chain plate; 3. EPE foam thick plate; 4. Cooling pin; 41. Pin holder; 411. Variable diameter through hole; 412. Upper spring; 413. Sealing slider; 414. Lower spring; 42. Needle tube; 5. Drive device; 6. Elevator; 7. Cold air chamber; 71. High-pressure cold air chamber; 72. Low-pressure cold air chamber; 8. Vacuum chamber; 81. High-pressure vacuum chamber; 82. Low-pressure vacuum chamber. Detailed Implementation

[0031] The present invention will be further described below with reference to specific embodiments.

[0032] like Figures 1-5 As shown, this embodiment is achieved through the following technical solution: it includes a frame 1, on which a cooling chain assembly 2 that can move up and down is installed, and the cooling chain assembly 2 is driven by a drive device 5; the cooling chain assembly 2 is ring-shaped and is composed of several cooling chain plates 21 hinged together, the cooling chain plates 21 are provided with hollow cavities, and cooling pins 4 are movably arranged in the cooling chain plates 21, the cooling pins 4 are provided with variable diameter through holes 411 and movable sealing sliders 413;

[0033] The cooling chain assembly 2 is provided with a cold air chamber 7 and a vacuum chamber 8 on both sides. The cooling chain assembly 2 slides in contact with the cold air chamber 7 and the vacuum chamber 8. The cold air chamber 7 can blow cold air into the EPE foamed thick plate through the cooling chain assembly 2 and the cooling pin 4. The vacuum chamber 8 is used to form a negative pressure and remove the heated air in the EPE foamed thick plate.

[0034] In this embodiment, a lifting platform 6 is installed on the frame 1. The lifting platform 6 is connected to the drive device 5 and can drive the drive device 5 to move up and down, thereby adjusting the thickness of the EPE foamed thick plate. There are two sets of cooling chain groups 2, arranged parallel to each other vertically. During operation, the EPE foamed thick plate is placed between the two sets of cooling chain groups 2, and the two sets of cooling chain groups together drive the EPE foamed thick plate to move backward. The cold air chamber 7 includes a high-pressure cold air chamber 71 and a low-pressure cold air chamber 72. The vacuum chamber 8 includes a high-pressure vacuum chamber 81 and a low-pressure vacuum chamber 82. The low-pressure cold air chamber 72, high-pressure cold air chamber 71, low-pressure vacuum chamber 82, and high-pressure vacuum chamber 81 are arranged sequentially from front to back. One end of both the cold air chamber 7 and the vacuum chamber 8 is movably connected to a guide shaft 12. The guide shaft 12 is fixed on a fixing block of the frame 1. A compression spring 11 is sleeved on the guide shaft 12. The compression spring 11 pushes the cold air chamber 7 so that it is always in contact with the cooling chain assembly 2, continuously blowing cold air into the cooling chain plate 21, while also serving a sealing function. The connection structure of the vacuum chamber 8 is the same as that of the cold air chamber 7.

[0035] The cooling pin 4 includes a needle tube 42 and a needle seat 41. The needle seat 41 has an opening at the top and a variable diameter through hole 411 inside. A sealing slider 413 is movably disposed in the variable diameter through hole 411. The diameter of the sealing slider 413 is equal to the minimum diameter of the variable diameter through hole 411. An upper spring 412 is connected above the sealing slider 413, and a lower spring 414 is connected below the sealing slider 413. The sealing slider 413 moves under the action of air pressure, the upper spring 412, and the lower spring 414, thereby realizing the conduction and cutoff of gas and driving the cooling pin 4 to move in the cavity of the cooling chain plate 21.

[0036] This embodiment, based on the internal cooling device of the aforementioned EPE foamed thick plate, includes the following steps:

[0037] S1. Place the EPE foamed thick plate 3 between the two cooling chain groups 2, and drive the cooling chain group 2 to move by the drive device 5, thereby driving the EPE foamed thick plate 3 to move backward.

[0038] S2, the cooling chain plate 21 moves to contact the low-pressure cold air box 72, and the low-pressure cold air box 72 blows low-pressure cold air into the cooling chain plate 21, so that the cooling pin 4 is inserted into the interior of the EPE foam thick plate 3.

[0039] S3, the cooling chain plate 21 continues to move until it contacts the high-pressure cold air box 71. The high-pressure cold air box 71 blows high-pressure cold air into the cooling chain plate 21. The high-pressure cold air enters the interior of the EPE foam thick plate 3 through the cooling pin 4 and cools its interior.

[0040] S4. The cooling chain plate 21 continues to move until it contacts the low-pressure vacuum chamber 82. The low-pressure vacuum chamber 82 generates a slight negative pressure to remove the air that has become hot inside the EPE foam thick plate 3.

[0041] S5. The cooling chain plate 21 continues to move until it contacts the high-pressure vacuum box 81. The high-pressure vacuum box 81 generates a high negative pressure, causing the cooling pin 4 to be extracted from the EPE foam thick plate 3.

[0042] S6. The cooling chain group 2 continues to convey the EPE foamed thick plate 3 backward. As the cooling chain group 2 rotates, it continuously cools the EPE foamed thick plate.

[0043] For step S2, when the low-pressure cold air box 72 blows low-pressure cold air into the cooling chain plate 21, the sealing slider 413 in the cooling pin 4 is in position C. At this time, the variable diameter through hole 411 is blocked, the gas does not conduct, and the cooling pin 4 moves within the cooling chain plate 21 under the force of the whole and is inserted into the EPE foam thick plate 3.

[0044] For step S3, when the high-pressure cold air box 71 blows high-pressure cold air into the cooling chain plate 21, the lower spring 414 is compressed and the sealing slider 413 reaches position D. At this time, the gas is connected and the cold air enters the interior of the EPE foamed thick plate 3 for cooling.

[0045] For step S4, when the low-pressure vacuum chamber 82 generates a slight negative pressure, the upper spring 412 is compressed, and the sealing slider 413 reaches position B. At this time, the vacuum is turned on, and the cooling pin 4 extracts the air that has become hot inside the EPE foamed thick plate 3.

[0046] For step S5, when the high-pressure vacuum chamber 81 generates a high negative pressure, the upper spring 412 is further compressed, the sealing slider 413 reaches position A, at which time the variable diameter through hole 411 is blocked, the cooling pin 4 is subjected to force as a whole, and is pulled out from the EPE foam thick plate 3.

Claims

1. An internal cooling device for EPE foamed thick plates, characterized in that, Includes a frame (1), on which a cooling chain assembly (2) that can move up and down is installed, the cooling chain assembly (2) is driven by a drive device (5); the cooling chain assembly (2) is ring-shaped and is composed of several cooling chain plates (21) hinged together, the cooling chain plates (21) are provided with hollow cavities, and cooling pins (4) are movably arranged in the cooling chain plates (21), the cooling pins (4) are provided with variable diameter through holes (411) and movable sealing sliders (413). The cooling chain assembly (2) is provided with a cold air box (7) and a vacuum box (8) on both sides. The cooling chain assembly (2) slides in contact with the cold air box (7) and the vacuum box (8). The cold air box (7) can blow cold air into the EPE foam thick plate through the cooling chain assembly (2) and the cooling pin (4). The cold air chamber (7) includes a high-pressure cold air chamber (71) and a low-pressure cold air chamber (72), and the vacuum chamber (8) includes a high-pressure vacuum chamber (81) and a low-pressure vacuum chamber (82); the low-pressure cold air chamber (72), the high-pressure cold air chamber (71), the low-pressure vacuum chamber (82), and the high-pressure vacuum chamber (81) are arranged in sequence from front to back; The cooling pin (4) includes a needle tube (42) and a needle seat (41). The needle seat (41) has an opening at the top and a variable diameter through hole (411) is provided inside the needle seat (41). A sealing slider (413) is movably arranged in the variable diameter through hole (411). The diameter of the sealing slider (413) is equal to the minimum diameter of the variable diameter through hole (411). A spring (412) is connected above the sealing slider (413), and a lower spring (414) is connected below the sealing slider (413).

2. The internal cooling device for EPE foamed thick plates according to claim 1, characterized in that, One end of the cold air box (7) and the vacuum box (8) is movably connected to the guide shaft (12). The guide shaft (12) is fixed on the fixing block of the frame (1). A compression spring (11) is sleeved on the guide shaft (12) to make the cold air box (7) contact the cooling chain assembly (2).

3. The internal cooling device for EPE foamed thick plates according to claim 1, characterized in that, The cooling chain group (2) consists of two sets, which are arranged in parallel vertically. The frame (1) is equipped with a lift (6) for driving the drive device (5) to move up and down. The lift (6) is connected to the drive device (5).

4. A method for internal cooling of EPE foamed thick plates, using the internal cooling device for EPE foamed thick plates as described in claim 1, characterized in that, Includes the following steps: S1. Place the EPE foamed thick plate (3) between two cooling chain groups (2), and drive the cooling chain groups (2) to move by the drive device (5), thereby driving the EPE foamed thick plate (3) to move backward. S2, the cooling chain plate (21) moves to contact the low-pressure cold air box (72), and the low-pressure cold air box (72) blows low-pressure cold air into the cooling chain plate (21), so that the cooling pin (4) is inserted into the interior of the EPE foam thick plate (3); S3, the cooling chain plate (21) continues to move until it contacts the high-pressure cold air box (71). The high-pressure cold air box (71) blows high-pressure cold air into the cooling chain plate (21). The high-pressure cold air enters the interior of the EPE foam thick plate (3) through the cooling pin (4) to cool its interior. S4. The cooling chain plate (21) continues to move until it comes into contact with the low-pressure vacuum chamber (82). The low-pressure vacuum chamber (82) generates a slight negative pressure, which removes the air that has become hot inside the EPE foamed thick plate (3). S5. The cooling chain plate (21) continues to move until it contacts the high-pressure vacuum box (81). The high-pressure vacuum box (81) generates a high negative pressure, causing the cooling pin (4) to be extracted from the EPE foam thick plate (3). S6. The cooling chain group (2) continues to convey the EPE foamed thick plate (3) backward. As the cooling chain group (2) rotates, it continuously cools the EPE foamed thick plate.

5. The internal cooling method for EPE foamed thick plates according to claim 4, characterized in that, For step S2, when the low-pressure cold air box (72) blows low-pressure cold air into the cooling chain plate (21), the sealing slider (413) in the cooling pin (4) is in position C. At this time, the gas is not connected, and the cooling pin (4) is subjected to force and moves in the cooling chain plate (21) and inserts into the EPE foam thick plate (3).

6. The internal cooling method for EPE foamed thick plates according to claim 4, characterized in that, For step S3, when the high-pressure cold air box (71) blows high-pressure cold air into the cooling chain plate (21), the lower spring (414) is compressed, the sealing slider (413) reaches position D, at which time the gas is connected, and the cold air enters the interior of the EPE foamed thick plate (3) for cooling.

7. The internal cooling method for EPE foamed thick plates according to claim 4, characterized in that, For step S4, when the low-pressure vacuum chamber (82) generates a slight negative pressure, the upper spring (412) is compressed, the sealing slider (413) reaches position B, at which point the vacuum is turned on, and the cooling pin (4) extracts the air that has become hot inside the EPE foamed thick plate (3).

8. The internal cooling method for EPE foamed thick plates according to claim 4, characterized in that, For step S5, when the high pressure vacuum chamber (81) generates high negative pressure, the upper spring (412) is further compressed, the sealing slider (413) reaches position A, at which time the variable diameter through hole (411) is blocked, the cooling pin (4) is subjected to force as a whole, and is pulled out from the EPE foam thick plate (3).

Images