Hot pressing device
By combining a hot press, an isolation chamber and a vacuum pump in the hot press device, providing an inert gas environment, the problems of spontaneous combustion and slow cooling of the hot pressing sheet are solved, and a safe and efficient hot pressing process is achieved.
Patent Information
- Application Number
- CN202422061695.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-08-23
AI Technical Summary
Traditional hot-pressed sheets are prone to spontaneous combustion at high temperatures, which pose safety hazards and are slow to cool, affecting production efficiency.
The hot pressing device is adopted, combined with a hot press, an isolation chamber and a vacuum pump, to provide an inert gas sealed environment, to control the height of the isolation chamber through a telescopic structure, reduce the risk of oxygen exposure, and cool it by replacing air with nitrogen.
Significantly reduce the spontaneous combustion rate of hot-pressed sheets, improve safety, simplify the cooling process, and reduce costs.
Smart Images
Figure CN223085033U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a hot pressing device. Background Art
[0002] When traditional heat-insulating materials are hot-pressed and formed, according to the thickness requirements of products, molds with corresponding sizes need to be customized to fix the product thickness. After hot pressing, the cured and formed hard felt blanks also need to be cooled. Since the hard felt blanks themselves are a kind of heat-insulating material with a porous structure and have good heat-insulating effects, their cooling is slow. If the hard felt blanks are relatively thick (more than 80 mm), after hot pressing, the internal temperature is still relatively high and the cooling is very slow. In the chemical structure of organic compounds, if they contain active methylene (-CH2) and active double bonds (-C=C-), under certain conditions, they will absorb oxygen molecules and generate heat, leading to "spontaneous combustion". The hard felt blanks contain phenolic resin. When exposed to air at high temperature for a long time, methylene will combine with oxygen molecules to form peroxides. Peroxides are an unstable compound, and heat will be generated during decomposition. If the heat is accumulated, flame free radicals will be generated. As the internal temperature continues to rise, the ignition temperature (570 °C) will eventually be reached, triggering spontaneous combustion. This will damage the products and cause serious quality accidents. Summary of the Utility Model
[0003] The technical problem to be solved by the utility model is to overcome the defect that the hot-pressed plates prepared by the existing hot pressing machines are prone to spontaneous combustion, and provide a hot pressing device. The hot-pressed plates prepared by using this hot pressing device have a low spontaneous combustion rate and a high safety factor.
[0004] The utility model solves the above technical problems through the following technical solutions.
[0005] The utility model provides a hot pressing device, which includes a hot press, an isolation chamber and a vacuum pump; the hot press is arranged in the space of the isolation chamber and the bottom of the hot press is fixedly connected to the bottom of the isolation chamber, and the side wall of the isolation chamber includes a telescopic structure; an air inlet and an air outlet are respectively arranged on the isolation chamber, and the air inlet is used for introducing nitrogen; the vacuum pump is communicated with the air outlet and is used for discharging the gas in the isolation chamber.
[0006] In the present utility model, preferably, the telescopic structure includes a pleated part, and the pleated part makes the isolation chamber extend or compress along the height direction in a manual or electric manner.
[0007] In this utility model, the hot press includes N layers of hot press plates placed in parallel. A mold is provided between every two adjacent hot press plates, and the mold is used to control the vertical distance between every two adjacent hot press plates. Preferably, the length of each hot press plate is equal, the width of each hot press plate is equal, and the height of each hot press plate is equal.
[0008] Preferably, N is 6 - 10.
[0009] Preferably, the ratio of the distance between every two adjacent hot press plates to the height of the hot press plate is 1:(10 - 30), and the units of the distance and the height are the same.
[0010] In a specific embodiment of this utility model, the length of the hot press plate is 2 m, the width of the hot press plate is 2 m, and the height of the hot press plate is 4 m.
[0011] Preferably, the ratio of the distance between the axis of the mold and the axis of the hot press plate to the length of the hot press plate is (0.4 - 0.5):1, and the units of the distance and the length are the same.
[0012] Preferably, the ratio of the vertical distance between the axis of the hot press plate and the side surface of the isolation chamber to the length of the hot press plate is (0.4 - 0.5):1, and the units of the vertical distance and the length are the same.
[0013] Preferably, the ratio of the vertical distance between the upper surface of the topmost hot press plate and the top of the isolation chamber to the height of the hot press plate is (1 - 4):1, more preferably 1:1, and the units of the vertical distance and the height are the same. The meaning of the ratio of the vertical distance between the upper surface of the topmost hot press plate and the top of the isolation chamber to the height of the hot press plate being (1 - 4):1 is that when the hot press plate is compressed to the minimum height, the minimum ratio of the vertical distance between the upper surface of the topmost hot press plate and the top of the isolation chamber to the height of the hot press plate is 1:1, and the maximum ratio is 4:1.
[0014] Preferably, a temperature and time control system is provided on each hot press plate.
[0015] In this utility model, preferably, the hot pressing device further includes a nitrogen cylinder, and the nitrogen cylinder is communicated with the air inlet.
[0016] A pressure reducer may be further provided on the nitrogen cylinder to adjust the valve of the nitrogen cylinder and control the nitrogen flow rate.
[0017] The nitrogen cylinder and the air inlet are communicated through a hose, for example.
[0018] The isolation chamber described in this utility model can provide a closed environment for the hot press.
[0019] In some specific embodiments of this utility model, double doors are provided on one side of the isolation chamber.
[0020] In some specific embodiments of this utility model, the hot press can be used for the curing and forming of soft felts, for example.
[0021] The positive and progressive effects of this utility model are as follows:
[0022] This utility model combines a hot press, an isolation chamber, and a vacuum pump to provide an inert gas sealed environment during the hot pressing process. This inert gas replaces the air around the hot press and can prevent the material after hot press curing and forming from burning internally when exposed to air. Moreover, the hot press and the isolation chamber are fixedly connected, and the side wall of the isolation chamber can be extended or compressed in the height direction to control the distance between the top of the isolation chamber and the topmost hot pressing plate, which can reduce the space and the consumption of cooling gas.
[0023] The hot pressing device provided by this utility model has a high safety factor, is convenient to operate, and has a low cost. Compared with the hot press in the prior art, the spontaneous combustion rate of the hot pressed plates prepared using this device is significantly reduced. Description of the Drawings
[0024] Figure 1 It is a schematic structural diagram of the hot pressing device of Example 1.
[0025] The reference numerals are as follows:
[0026] 1 - Hot press; 2 - Isolation chamber; 3 - Vacuum pump; 4 - Nitrogen cylinder;
[0027] 101 - Hot pressing plate; 102 - Mold; 201 - Air inlet; 202 - Air outlet. Detailed Embodiments
[0028] The following further illustrates this utility model by way of examples, but this utility model is not limited to the scope of the described examples. The experimental methods without specific conditions noted in the following examples are carried out according to conventional methods and conditions, or selected according to the product specifications.
[0029] Example 1
[0030] The schematic structural diagram of the hot pressing device of Example 1 is as Figure 1As shown in the figure, it includes a hot press 1, an isolation chamber 2, a vacuum pump 3, and a nitrogen cylinder 4; the hot press is arranged inside the isolation chamber, and the bottom of the hot press is fixedly connected to the bottom of the isolation chamber. The side wall of the isolation chamber includes a telescopic structure, and the telescopic structure includes a pleated part. The pleated part is used to extend or compress the isolation chamber along the height direction manually; an air inlet 201 and an air outlet 202 are respectively provided on the isolation chamber. The air inlet is used to introduce nitrogen; the vacuum pump is connected to the air outlet and is used to discharge the gas in the isolation chamber; the nitrogen cylinder is connected to the air inlet. A pressure reducer is provided on the nitrogen cylinder to adjust the valve of the nitrogen cylinder and control the nitrogen flow. The nitrogen cylinder and the air inlet are connected by a hose;
[0031] Among them, the hot press includes 8 layers of hot press plates 101 placed in parallel. A mold 102 is provided between every two adjacent hot press plates. The mold is used to control the vertical distance between every two adjacent hot press plates; the length, width, and height of each layer of hot press plate are equal, and its length * width * height is 2m * 2m * 4m; the ratio of the distance between every two adjacent hot press plates to the height of the hot press plate is 1:20, and the units of the distance and the height are the same; the ratio of the distance between the axis of the mold and the axis of the hot press plate to the length of the hot press plate is 0.45:1, and the units of the distance and the length are the same; the ratio of the vertical distance between the axis of the hot press plate and the side surface of the isolation chamber to the length of the hot press plate is 0.5:1, and the units of the vertical distance and the length are the same; the ratio of the vertical distance between the upper surface of the topmost hot press plate and the top of the isolation chamber to the height of the hot press plate is 1:1, and the units of the vertical distance and the height are the same; a temperature and time control system is provided on each layer of hot press plate.
[0032] In Example 1, the above-mentioned hot pressing device is adopted, and the following method is used to prepare hot-pressed plates:
[0033] After the asphalt-based soft felt after gluing is placed layer by layer between each layer of hot press plates placed in parallel, the hot press starts to close, pressurizes to 10 Mpa, heats up to the target temperature of 200 °C and keeps it warm;
[0034] After the heating and heat preservation are completed, turn off the heating, turn on the vacuum pump, set the vacuum degree of the vacuum pump to 1 kPa, extract the gas in the isolation chamber for 30 minutes, and then turn off the vacuum pump;
[0035] Open the air inlet of the isolation chamber and open the valve of the nitrogen cylinder. Use the pressure reducer to adjust the nitrogen flow, introduce nitrogen into the isolation chamber. The nitrogen has a purity of 98% and a flow rate of 10 L / min. After 30 minutes, when the isolation chamber is filled with nitrogen, close the nitrogen cylinder and close the air inlet and air outlet of the isolation chamber; wait until the temperature drops below 50 °C, take out the cured and cooled hard felt blank hot-pressed plate, and transfer it to the next process.
[0036] Example 1: 300 hot-pressed plates with a length * width * height of 1600 mm * 1300 mm * 100 mm were prepared by the above method. Before the 300 hot-pressed plates were taken out of the hot-pressing device, spontaneous combustion occurred in 1 hot-pressed plate. After calculation, the spontaneous combustion rate of Example 1 was obtained as follows: Spontaneous combustion rate = 1 / 300 * 100% = 0.3%.
[0037] Comparative Example 1
[0038] The hot-pressing device of Comparative Example 1 does not include an isolation chamber, a vacuum pump, and a nitrogen cylinder, and only includes the hot press of Example 1.
[0039] The method for preparing hot-pressed plates in Comparative Example 1 is the same as that in Example 1.
[0040] Comparative Example 1: 200 hot-pressed plates with a length * width * height of 1600 mm * 1300 mm * 100 mm were prepared by the above method. Before the 200 hot-pressed plates were taken out of the hot press, spontaneous combustion occurred in 6 hot-pressed plates. After calculation, the spontaneous combustion rate of Example 1 was obtained as follows: Spontaneous combustion rate = 6 / 200 * 100% = 3%.
[0041] From the above data, it can be seen that the hot-pressing device of the present utility model can effectively reduce the spontaneous combustion phenomenon of the prepared hot-pressed plates.
Claims
1. A hot pressing device, characterized in that, It includes a hot press, an isolation chamber and a vacuum pump; the hot press is arranged in the space of the isolation chamber and the bottom of the hot press is fixedly connected to the bottom of the isolation chamber, and the side wall of the isolation chamber includes a telescopic structure; an air inlet and an air outlet are respectively arranged on the isolation chamber, and nitrogen is introduced through the air inlet; the vacuum pump is communicated with the air outlet for discharging the gas in the isolation chamber.
2. The hot pressing device according to claim 1, wherein The telescopic structure includes a pleated part, and the pleated part is used to extend or compress the isolation chamber in the height direction manually or electrically.
3. The hot pressing device according to claim 1, characterized in that, The hot press includes N layers of hot press plates placed in parallel, and a mold is arranged between every two adjacent hot press plates, and the mold is used to control the vertical distance between every two adjacent hot press plates; the length, height and width of each layer of hot press plate are equal.
4. The hot pressing device according to claim 3, wherein, The hot pressing device meets one or both of the following conditions (1)-(2): (1) N is 6-10; (2) The ratio of the distance between every two adjacent hot press plates to the height of the hot press plate is 1:(10-30).
5. The hot pressing device according to claim 3, characterized in that, The ratio of the distance between the axis of the mold and the axis of the hot press plate to the length of the hot press plate is (0.4-0.5):
1.
6. The hot pressing device according to claim 3, characterized in that, The ratio of the vertical distance between the axis of the hot press plate and the side surface of the isolation chamber to the length of the hot press plate is (0.4-0.5):
1.
7. The hot pressing device according to claim 3, characterized in that, The ratio of the vertical distance between the upper surface of the topmost hot press plate and the top of the isolation chamber to the height of the hot press plate is (1-4):
1.
8. The hot pressing device according to claim 3, characterized in that, The hot pressing device meets one or more of the following conditions: (1) A temperature and time control system is arranged on each layer of hot press plate; (2) The lengths of each layer of hot press plates are equal, the widths of each layer of hot press plates are equal, and the heights of each layer of hot press plates are equal; (3) The length of the hot press plate is 2m, the width of the hot press plate is 2m, and the height of the hot press plate is 4m.
9. The hot pressing device according to claim 1, characterized in that, The hot pressing device further includes a nitrogen cylinder, and the nitrogen cylinder is communicated with the air inlet.
10. The hot pressing device according to claim 9, characterized in that, The hot pressing device meets one or more of the following conditions: (1) A pressure reducer is arranged on the nitrogen cylinder for adjusting the valve of the nitrogen cylinder to control the nitrogen flow rate; (2) The nitrogen cylinder is communicated with the air inlet through a hose.