Roller constant temperature device with high-temperature and high-pressure water supply function

Abstract

The utility model relates to a roller constant temperature device with a high-temperature and high-pressure water supply function. The roller constant temperature device is characterized by comprising a first water inlet pipe, a second water inlet pipe, a drain pipe, a heating tank and a heat exchanger, the first water inlet pipe, the heating tank and a hot water inlet of the heat exchanger are sequentially communicated, a hot water outlet of the heat exchanger is communicated with a water inlet of the roller, and a water outlet of the roller is communicated with the heating tank; the second water inlet pipe is connected with a cold water inlet of the heat exchanger; a check valve is arranged on the first water inlet pipe, and a proportional valve is arranged on the second water inlet pipe. The roller constant-temperature device with the high-temperature and high-pressure water supply function can provide stable high-temperature and high-pressure constant-temperature water, it is ensured that a roller of a sheet machine can be continuously cooled, and it is ensured that sheets are smoothly formed.

Description

Technical Field

[0001] The utility model relates to a constant temperature device, in particular to a roller constant temperature device with a high-temperature and high-pressure water supply function. Background Art

[0002] The rollers of the sheet machine are usually equipped with a constant temperature device to ensure that the sheet can obtain a uniform thickness, smooth and clean effect after being calendered by multiple rollers after extrusion. Generally, when the sheet machine is molten to extrude the plastic sheet, the extrusion temperature is as high as 200°C or more. When the sheet is calendered on the multi-roll calender, the heat of the molten plastic is transferred to the rollers. The temperature of the rollers will gradually increase over time. When the roller temperature reaches a temperature close to that of the plastic sheet, the heat cannot be transferred and the sheet cannot be formed. Therefore, constant temperature water of a certain temperature must be passed into the rollers to better meet the process requirements of plastic sheet forming.

[0003] At present, most roller thermostats used in the market can only provide constant temperature water of no more than 80°C, which cannot meet the needs of special material molding. When molding some special materials, constant temperature water of 100°C or even above 120°C needs to be passed into the roller to meet the molding process requirements. Summary of the invention

[0004] The problem to be solved by the utility model is to provide a roller thermostat with high temperature and high pressure water supply function, which can provide stable high temperature and high pressure constant temperature water to ensure that the roller of the sheet machine can continue to cool and ensure the smooth forming of the sheet. The technical solution adopted is as follows:

[0005] A roller constant temperature device with high-temperature and high-pressure water supply function, characterized in that it includes a first water inlet pipe, a second water inlet pipe, a drain pipe, a heating tank and a heat exchanger; the first water inlet pipe, the heating tank and the hot water inlet of the heat exchanger are connected in sequence, the hot water outlet of the heat exchanger is connected to the water inlet of the roller, and the water outlet of the roller is connected to the heating tank; the second water inlet pipe is connected to the cold water inlet of the heat exchanger, and the cold water outlet of the heat exchanger is connected to the drain pipe; a check valve is provided on the first water inlet pipe, and a proportional valve is provided on the second water inlet pipe.

[0006] The first water inlet pipe and the second water inlet pipe are both connected to an external cold water source.

[0007] The temperature of the heating tank and heat exchanger is set by the control center of the sheet machine, and temperature sensors are set at the heater and heat exchanger to feed back the current temperature of the heater and heat exchanger to the control center in real time for dynamic adjustment. The first water inlet pipe sends cold water into the heating tank for heating. After heating to the highest temperature of the heating tank, the heating is stopped and hot water is sent to the heat exchanger. At the same time, the second water inlet pipe also sends cold water into the heat exchanger; in the heat exchanger, hot water and cold water exchange heat. When the hot water in the heat exchanger drops to the highest temperature set by the heat exchanger, the hot water enters the roller; the hot water passing through the roller flows back to the heating tank. In addition, a check valve is set at the first water inlet pipe to avoid backflow in the hot water circulation; a proportional valve is set at the second water inlet pipe, which can adjust the cold water inlet of the second water inlet pipe according to the hot water temperature and the set temperature of the heat exchanger to achieve precise temperature control of the heat exchanger.

[0008] When the hot water circulating back to the heating tank is still higher than the lowest temperature set in the heating tank, the heating tank stops heating and directly sends the refluxed hot water to the heat exchanger until the hot water circulating back to the heating tank is lower than the lowest temperature set in the heating tank, and the heating tank is heated again. When the water in the heating tank is insufficient, open the check valve to replenish the water. For the cold water in the heat exchanger, when the heat exchange temperature of the heat exchanger drops to the set lowest temperature, close the proportional valve and the heat exchanger will no longer perform heat exchange work.

[0009] By setting the minimum and maximum temperatures of the heating tank and the heat exchanger, as well as the circulation of hot water between the "heating tank-heat exchanger-roller-heating tank", and the cold water heat exchange of the heat exchanger, the cooling water entering the roller is dynamically adjusted to ensure that the cooling water entering the roller maintains a high pressure, high temperature and constant temperature, ensuring that the roller of the sheet machine can continue to cool.

[0010] As a preferred solution of the utility model, the roller constant temperature device further includes a water storage tank and a water supply pump, the first water inlet pipe, the water storage tank, the water supply pump, and the heating tank are connected in sequence, and the water outlet of the roller is connected to the water storage tank. The water storage tank is provided to store cold water, and the hot water flowing out of the roller is returned to the water storage tank to directly cool the returned hot water.

[0011] As a further preferred embodiment of the present invention, the roller constant temperature device further comprises a filter tank, and the filter tank is arranged between the water outlet of the roller and the water storage tank.

[0012] As a further preferred solution of the utility model, a filter is further provided on the second water inlet pipe, and the filter is arranged in front of the proportional valve according to the water inlet direction. The filter is preferably a Y-type filter.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] The roller constant temperature device with high-temperature and high-pressure water supply function of the utility model dynamically adjusts the cooling water entering the roller through the circulation of hot water between "heating tank-heat exchanger-roller-heating tank" and the cold water heat exchange work of the heat exchanger, ensuring that the cooling water entering the roller maintains a high-pressure and high-temperature constant temperature, ensuring that the roller of the sheet machine can continue to perform cooling operations, thereby ensuring smooth forming of the sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a preferred embodiment of the utility model;

[0016] Figure 2 It is a principle diagram of a preferred embodiment of the utility model;

[0017] Among them, the labels are: 1-first water inlet pipe, 2-second water inlet pipe, 3-water storage tank, 4-water supply pump, 5-heating tank, 6-heat exchanger, 7-filter tank, 8-drain pipe, 9-roller, 10-check valve, 11-proportional valve, 12-Y-type filter. DETAILED DESCRIPTION

[0018] The following is a further description of the preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0019] like Figure 1 and Figure 2 As shown, a roller constant temperature device with high-temperature and high-pressure water supply function includes a first water inlet pipe 1, a second water inlet pipe 2, a water storage tank 3, a water supply pump 4, a heating tank 5, a heat exchanger 6, a filter tank 7 and a drain pipe 8; the first water inlet pipe 1 and the second water inlet pipe 2 are both connected to an external cold water source, the first water inlet pipe 1, the water storage tank 3, the water supply pump 4, the heating tank 5, and the hot water inlet of the heat exchanger 6 are connected in sequence, the hot water outlet of the heat exchanger 6 is connected to the water inlet of the roller 9, and the water outlet of the roller 9 is connected to the water storage tank 3 through the filter tank 7; the second water inlet pipe 2 is connected to the cold water inlet of the heat exchanger 6, and the cold water outlet of the heat exchanger 6 is connected to the drain pipe 8; a check valve 10 is provided on the first water inlet pipe 1, a proportional valve 11 is provided on the second water inlet pipe 2, and a Y-type filter 12 is provided on the second water inlet pipe 2 in front of the proportional valve 11 according to the water inlet direction.

[0020] Before operation, the heating tank 5 and the heat exchanger 6 are both set with a minimum temperature and a maximum temperature for dynamic adjustment. Figure 2As shown, the first water inlet pipe 1 and the second water inlet pipe 2 are both connected to an external cold water source, the water storage tank 3 stores cold water, and the water supply pump 4 sends the cold water in the water storage tank 3 to the heater for heating. After heating to the highest temperature of the heating tank 5, the heating is stopped, and the hot water is sent to the heat exchanger 6. At the same time, the second water inlet pipe 2 also sends cold water to the heat exchanger 6; in the heat exchanger 6, the hot water and the cold water exchange heat, and when the hot water in the heat exchanger 6 is reduced to the highest temperature set by the heat exchanger 6, the hot water enters the roller 9; the hot water flowing through the roller 9 is filtered by the filter and then returned to the water storage tank 3, and the cold water in the water storage tank 3 directly cools the returning hot water.

[0021] When the hot water in the heating tank 5 is still higher than the minimum temperature set in the heating tank 5, the heating tank 5 stops heating and directly sends the refluxed hot water into the heat exchanger 6 until the hot water circulating back to the heating tank 5 is lower than the minimum temperature set in the heating tank 5, and the heating tank 5 is heated again. When the amount of water in the heating tank 5 is insufficient, the check valve 10 is opened to replenish the water. As for the cold water in the heat exchanger 6, when the heat exchange temperature of the heat exchanger 6 drops to the set minimum temperature, the proportional valve 11 is closed, and the heat exchanger 6 no longer performs heat exchange work. The first water inlet pipe 1 is provided with a check valve 10 to avoid backflow in the hot water circulation; the second water inlet pipe 2 is provided with a proportional valve 11, which can adjust the amount of cold water inlet of the second water inlet pipe 2 according to the hot water temperature and the set temperature of the heat exchanger 6, so as to realize the precise temperature control of the heat exchanger 6.

[0022] By setting the minimum and maximum temperatures of the heating tank 5 and the heat exchanger 6, as well as the circulation of hot water between "heating tank 5-heat exchanger 6-roller 9-heating tank 5", and the cold water heat exchange of the heat exchanger 6, the cooling water entering the roller 9 is dynamically adjusted to ensure that the cooling water entering the roller 9 maintains a high pressure, high temperature and constant temperature, ensuring that the roller 9 of the sheet machine can continue to perform cooling operations.

[0023] In addition, it should be noted that the names of the various parts of the specific embodiments described in this specification may be different, and any equivalent or simple changes made based on the structure, features and principles described in the utility model patent concept are included in the protection scope of the utility model patent. The technical personnel of the technical field to which the utility model belongs can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the protection scope of the utility model.

Claims

1. A roller constant temperature device with high temperature and high pressure water supply function, characterized in that: It includes a first water inlet pipe, a second water inlet pipe, a drain pipe, a heating tank and a heat exchanger; the first water inlet pipe, the heating tank and the hot water inlet of the heat exchanger are connected in sequence, the hot water outlet of the heat exchanger is connected to the water inlet of the roller, and the water outlet of the roller is connected to the heating tank; the second water inlet pipe is connected to the cold water inlet of the heat exchanger, and the cold water outlet of the heat exchanger is connected to the drain pipe; a check valve is provided on the first water inlet pipe, and a proportional valve is provided on the second water inlet pipe.

2. The roller constant temperature device with high temperature and high pressure water supply function according to claim 1, characterized in that: The roller constant temperature device also includes a water storage tank and a water supply pump. The first water inlet pipe, the water storage tank, the water supply pump, and the heating tank are connected in sequence, and the water outlet of the roller is connected to the water storage tank.

3. The roller thermostat with high temperature and high pressure water supply function according to claim 2, characterized in that: The roller constant temperature device also includes a filter tank, which is arranged between the water outlet of the roller and the water storage tank.

4. The roller constant temperature device with high temperature and high pressure water supply function according to any one of claims 1 to 3, characterized in that: The second water inlet pipe is also provided with a filter, and the filter is arranged in front of the proportional valve according to the water inlet direction.

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