Temperature control system of continuous hot press

Abstract

The utility model provides a temperature control system of a continuous hot press, which relates to the technical field of hot presses and comprises an oil tank, a heater, a heat exchanger, a pressure die end, an electric cabinet, a temperature sensor and a circulating pump. The first end of the circulating pump is connected with the heater, and the second end is connected with the pressure mold end; the temperature sensor is arranged between the circulating pump and the heater; the electric control box is electrically connected with the heater, the heat exchanger, the temperature sensor and the circulating pump. According to the utility model, rapid heating and cooling of the hot press can be realized; the stability of the working temperature of the hot press is good; the heat exchange efficiency is high; it is guaranteed that the system works under the safe pressure, and meanwhile the function of emergency pressure relief when equipment leaks and breaks down is achieved.

Description

Technical Field

[0001] This utility model relates to the field of hot press technology, and specifically to a temperature control system for a continuous hot press. Background Technology

[0002] Continuous hot presses are important production equipment in the mold processing process. In the continuous hot pressing process, the temperature field of existing continuous hot presses changes frequently due to the continuous entry of material into the cavity for heat absorption and exchange, resulting in insufficient temperature stability of the equipment. In addition, continuous hot presses have specific requirements for temperature uniformity and rapid heating and cooling. Therefore, it is necessary to ensure the safe and stable operation of the equipment and provide suitable temperature uniformity.

[0003] Chinese patent CN216031445U discloses a thermal circulation system for a bamboo product hot press, which adopts a technical solution combining a heater, a cooling system, and a temperature sensor. This solves the problems of rapid temperature changes in existing hot presses, which affect the quality of manufactured bamboo products, and the lack of a cooling system. However, this solution uses water as a heat transfer medium, which results in slow temperature control and adjustment. The heating and cooling speeds are also slow, which cannot meet the requirements of rapid heating and cooling and stable operating temperature in the actual production of continuous hot presses.

[0004] Chinese patent CN104942919A discloses an oil-guided hot circulation hot press, which uses a combination of heater and temperature sensor to solve the problems of slow heating and uneven heat distribution in existing hot presses. However, this solution can only heat up but not cool down, and cannot achieve temperature control. It cannot meet the requirements of rapid heating and cooling and stable working temperature in the actual production of continuous hot presses. Utility Model Content

[0005] The purpose of this invention is to provide a temperature control system for a continuous hot press that enables rapid heating and cooling and has good working temperature stability.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a temperature control system for a continuous hot press, comprising an oil tank, a heater, a heat exchanger and a pressure mold end connected in sequence, and also including an electrical control box, a temperature sensor and a circulating pump;

[0007] The first end of the circulating pump is connected to the heater, and the second end is connected to the pressure mold end; the temperature sensor is located between the circulating pump and the heater; the electrical control box is electrically connected to the heater, heat exchanger, temperature sensor and circulating pump respectively.

[0008] Furthermore, the heat exchanger is equipped with a cooling water pipeline loop, with the first end of the cooling water pipeline loop connected to the cooling water inlet and the second end connected to the cooling water outlet.

[0009] Furthermore, the pipes in the cooling water pipeline loop are corrugated heat transfer pipes.

[0010] Furthermore, the internal cooling water pipeline loop of the heat exchanger is M-shaped.

[0011] Furthermore, a control valve is installed between the first end of the cooling water pipeline loop and the cooling water inlet.

[0012] Furthermore, the electrical control box is electrically connected to the control valve.

[0013] Furthermore, a pressure sensor is provided between the second end of the circulating pump and the pressure mold end.

[0014] Furthermore, the pressure sensor has a measurement range of 0 bar to 25 bar.

[0015] Furthermore, the oil tank is equipped with an air inlet switch, an air outlet switch, and an oil inlet.

[0016] Furthermore, the electrical control box is equipped with an over-temperature controller.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] I. Based on the original hot press structure, this device additionally adopts the technical solution of electrical control box, temperature sensor and circulating pump. The electrical control box collects the feedback signal of temperature sensor, thereby adjusting the working status of circulating pump, heater and heat exchanger. It can not only realize the rapid heating and cooling of hot press, but also achieve good stability of hot press working temperature when it is necessary to maintain the stability of hot press working temperature, which is more suitable for the actual production needs of continuous hot press.

[0019] II. The heat exchanger in this device adopts a cooling water pipeline loop with a control valve installed on the loop. The control box is electrically connected to the control valve. The heat exchange efficiency is changed by controlling the water flow in the pipeline loop through the control box, thereby helping to achieve rapid heating and cooling of the hot press and maintain the stability of the hot press's operating temperature. At the same time, the cooling water pipeline loop uses corrugated heat transfer tubes, which have high heat exchange efficiency.

[0020] Third, this device uses a pressure sensor, along with an air inlet switch and an air outlet switch on the oil tank, to regulate the pressure of the hot press pipeline. This not only prevents excessive internal pressure in the hot press pipeline and ensures the system operates under safe pressure, but also enables emergency pressure relief in case of equipment leakage. Attached Figure Description

[0021] Figure 1 A schematic diagram of a temperature control system for a continuous hot press provided by this utility model;

[0022] In the picture:

[0023] 1. Oil tank; 2. Heater; 3. Heat exchanger; 4. Pressure mold end; 5. Electrical control box; 6. Temperature sensor; 7. Circulating pump; 8. Pressure sensor; 9. Air inlet switch; 10. Air outlet switch; 11. Oil inlet; 12. Over-temperature controller; 31. Cooling water pipeline circuit; 32. Cooling water inlet; 33. Cooling water outlet; 34. Control valve. Detailed Implementation

[0024] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] See Figure 1 This utility model provides a temperature control system for a continuous hot press, including an oil tank 1, a heater 2, a heat exchanger 3 and a pressure mold end 4 connected in sequence, and also includes an electrical control box 5, a temperature sensor 6 and a circulating pump 7.

[0027] The first end of the circulating pump 7 is connected to the heater 2, and the second end is connected to the pressure mold end 4; the temperature sensor 6 is set between the circulating pump 7 and the heater 2; the electrical control box 5 is electrically connected to the heater 2, the heat exchanger 3, the temperature sensor 6 and the circulating pump 7 respectively.

[0028] A pressure sensor 8 is installed between the second end of the circulating pump 7 and the pressure mold end 4. The measurement range of the pressure sensor 8 is 0 bar to 25 bar. An air inlet switch 9, an air outlet switch 10 and an oil inlet 11 are installed on the oil tank 1. An over-temperature controller 12 is installed on the electrical control box 5.

[0029] According to a specific embodiment of this utility model: the heat exchanger 3 is provided with a cooling water pipeline loop 31, the pipes in the cooling water pipeline loop 31 are corrugated heat transfer pipes, the shape of the cooling water pipeline loop 31 inside the heat exchanger 3 is M-shaped, the first end of the cooling water pipeline loop 31 is connected to the cooling water inlet 32, the second end is connected to the cooling water outlet 33, a control valve 34 is provided between the first end of the cooling water pipeline loop 31 and the cooling water inlet 32, and the electrical control box 5 is electrically connected to the control valve 34.

[0030] The following specific examples will provide further illustration:

[0031] Example 1

[0032] like Figure 1 As shown, this embodiment provides a temperature control system for a continuous hot press, which includes an oil tank 1, a heater 2, a heat exchanger 3 and a pressure mold end 4 connected in sequence, and also includes an electrical control box 5, a temperature sensor 6 and a circulating pump 7.

[0033] The first end of the circulating pump 7 is connected to the heater 2, and the second end is connected to the pressure mold end 4; the temperature sensor 6 is set between the circulating pump 7 and the heater 2; the electrical control box 5 is electrically connected to the heater 2, the heat exchanger 3, the temperature sensor 6 and the circulating pump 7 respectively.

[0034] When the hot press is rapidly heated and cooled, the electrical control box 5 receives the signal from the temperature sensor 6 through the control system, analyzes the difference between the actual temperature and the set temperature, and feeds it back to the control system. If the actual temperature is too low, the system controls the heater 2 to increase its maximum heating power and controls the heat exchanger 3 to stop the heat exchange process. The circulating pump 7 continuously pumps the oil heated in the heater 2 to the pressure mold end 4, thereby maximizing the rapid heating. When the actual temperature is detected to be much higher than the set temperature, the system controls the heater 2 to stop heating and simultaneously controls the heat exchanger 3 to start the maximum heat exchange process. The circulating pump 7 continuously pumps the oil cooled in the heat exchanger 3 to the pressure mold end 4, thereby maximizing the rapid cooling function.

[0035] When temperature control is achieved, the target temperature is set in the internal control system of the hot press. The electrical control box 5 receives the signal from the temperature sensor 6 through the control system, analyzes the difference between the actual temperature and the set temperature, and feeds it back to the control system. The control system automatically adjusts the output power of the heater 2 and the heat exchange process of the heat exchanger 3. The circulating pump 7 continuously pumps the oil in the pipeline to the pressure mold end 4. When the temperature sensor 6 detects that the temperature of the pumped oil has reached the target temperature, the output power of the heater 2 and the heat exchange process of the heat exchanger 3 are maintained, thereby maintaining the stability of the hot press's working temperature and meeting the needs of rapid temperature rise and fall and maintaining the stability of the hot press's working temperature in the actual production of continuous hot presses.

[0036] It should be noted that the circulating pump 7 is equipped with a frequency converter, and the electrical control box 5 is electrically connected to the frequency converter on the circulating pump 7 to control the speed of the circulating pump 7, thereby controlling the flow rate of the oil circulating in the pipeline.

[0037] Example 2

[0038] like Figure 1 As shown, this embodiment provides a temperature control system for a continuous hot press, which includes an oil tank 1, a heater 2, a heat exchanger 3 and a pressure mold end 4 connected in sequence, and also includes an electrical control box 5, a temperature sensor 6 and a circulating pump 7.

[0039] The first end of the circulating pump 7 is connected to the heater 2, and the second end is connected to the pressure mold end 4; the temperature sensor 6 is set between the circulating pump 7 and the heater 2; the electrical control box 5 is electrically connected to the heater 2, the heat exchanger 3, the temperature sensor 6 and the circulating pump 7 respectively.

[0040] A pressure sensor 8 is installed between the second end of the circulating pump 7 and the pressure mold end 4. The measurement range of the pressure sensor 8 is 0 bar to 25 bar. An air inlet switch 9, an air outlet switch 10 and an oil inlet 11 are installed on the oil tank 1. An over-temperature controller 12 is installed on the electrical control box 5.

[0041] The heat exchanger 3 is equipped with a cooling water pipeline loop 31. The pipes in the cooling water pipeline loop 31 are corrugated heat transfer pipes. The cooling water pipeline loop 31 inside the heat exchanger 3 is M-shaped. The first end of the cooling water pipeline loop 31 is connected to the cooling water inlet 32, and the second end is connected to the cooling water outlet 33. A control valve 34 is installed between the first end of the cooling water pipeline loop 31 and the cooling water inlet 32. The electrical control box 5 is electrically connected to the control valve 34.

[0042] It should be noted that the function of pressure sensor 8 is to detect the pressure value in the oil pipeline. Working in conjunction with the control system and the air inlet switch 9 and air outlet switch 10 on oil tank 1, it ensures the system operates under safe pressure. After detecting the pressure value, pressure sensor 8 makes a judgment based on the control system and the set pressure value. When the actual pressure value exceeds the set pressure value, the air inlet switch 9 on oil tank 1 is closed, and the air outlet switch 10 on oil tank 1 is opened, releasing the pressure in the system through oil tank 1, thus preventing over-pressure and providing emergency pressure relief. When the actual pressure value is lower than the set pressure value, the air inlet switch 9 on oil tank 1 is opened, and the air outlet switch 10 on oil tank 1 is closed, filling the tank with inert gas. Pressure is then applied to the system through oil tank 1, meeting the pressure stability requirements of the continuous hot press, providing stable high pressure at high temperatures, and ensuring the safe and stable operation of the equipment. In actual production, a pressure measurement range of 0 bar to 25 bar is more suitable.

[0043] It should be noted that, in this embodiment, the heat exchanger 3 is equipped with a cooling water pipeline loop 31. The cooling water pipeline loop 31 inside the heat exchanger 3 is M-shaped. The first end of the cooling water pipeline loop 31 is connected to the cooling water inlet 32, and the second end is connected to the cooling water outlet 33. A control valve 34 is installed between the first end of the cooling water pipeline loop 31 and the cooling water inlet 32. The electrical control box 5 is electrically connected to the control valve 34. High-efficiency heat exchange is achieved inside the heat exchanger 3 through circulating cooling water. The electrical control box 5 adjusts the amount of cooling water entering the heat exchanger through the control valve 34 to regulate the heat exchange efficiency. The M-shaped shape of the cooling water pipeline loop 31 inside the heat exchanger 3 increases the contact area between the cooling water and the oil inside the heat exchanger 3, thereby further increasing the heat exchange efficiency.

[0044] It should be noted that the pipes in the cooling water pipeline loop 31 are corrugated heat transfer pipes, which are double-sided reinforced heat transfer pipes. The corrugated surfaces protruding inside and outside the corrugated pipes increase the contact area between the fluid inside and outside the cooling pipes, and the heat transfer coefficient is several times that of the traditional shell-and-tube heat exchanger 3. It has a very good temperature difference stress compensation capability and is suitable for occasions with large temperature differences.

[0045] The working principle of this utility model is as follows:

[0046] When the hot press is rapidly heated and cooled, the electrical control box 5 receives the signal from the temperature sensor 6 through the control system, analyzes the difference between the actual temperature and the set temperature, and feeds it back to the control system. If the actual temperature is too low, the system adjusts the heater 2 to the maximum heating power through the over-temperature controller 12 and controls the control valve 34 of the heat exchanger 3 to be completely closed. The circulation pump 7 continuously pumps the oil heated in the heater 2 to the pressure mold end 4, thereby maximizing the rapid heating. When the actual temperature is detected to be too high compared to the set temperature, the heater 2 is controlled to stop heating, and the control valve 34 of the heat exchanger 3 is controlled to be fully opened. The circulation pump 7 continuously pumps the oil cooled in the heat exchanger 3 to the pressure mold end 4, thereby maximizing the rapid cooling function.

[0047] When temperature control is achieved, the target temperature is set in the internal control system of the hot press. The electrical control box 5 receives the signal from the temperature sensor 6 through the control system, analyzes the difference between the actual temperature and the set temperature, and feeds it back to the control system. The control system adjusts the output power of the heater 2 and the heat exchange process of the heat exchanger 3 through the over-temperature controller 12. The circulating pump 7 continuously pumps the oil in the pipeline to the pressure mold end 4. When the temperature sensor 6 detects that the temperature of the pumped oil has reached the target temperature, the output power of the heater 2 and the heat exchange process of the heat exchanger 3 are maintained, thereby maintaining the stability of the hot press's working temperature and meeting the needs of rapid temperature rise and fall and maintaining the stability of the hot press's working temperature in the actual production of continuous hot presses.

[0048] It should be noted that, in addition to regulating the output power of the heater 2 as a control system, the over-temperature controller 12 also has the function of preventing the heater 2 from overheating. When the over-temperature controller 12 detects that the operating temperature of the heater 2 is too high, it will automatically trigger the cooling protection, adjust and reduce the heating power of the heater 2, and ensure that the heater 2 operates at a safe temperature.

[0049] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent transformations or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A temperature control system of a continuous hot press, comprising an oil tank, a heater, a heat exchanger and a pressure die end connected in sequence, characterized in that: Further comprising an electric control box, a temperature sensor and a circulating pump; The first end of the circulating pump is connected with the heater, and the second end is connected with the pressure mold end; the temperature sensor is arranged between the circulating pump and the heater; and the electric control box is electrically connected with the heater, the heat exchanger, the temperature sensor and the circulating pump respectively.

2. The temperature control system of a continuous hot press according to claim 1, wherein: The heat exchanger is internally provided with a cooling water pipeline loop, the first end of which is connected with a cooling water inlet, and the second end is connected with a cooling water outlet.

3. A temperature control system for a continuous hot press according to claim 2, wherein: The pipeline in the cooling water pipeline loop is a corrugated heat transfer pipe.

4. The temperature control system of a continuous hot press according to claim 2, wherein: The shape of the cooling water pipeline loop inside the heat exchanger is M-shaped.

5. The temperature control system of a continuous hot press according to claim 2, wherein: A control valve is arranged between the first end of the cooling water pipeline loop and the cooling water inlet.

6. A temperature control system for a continuous hot press according to claim 5, wherein: The electric control box is electrically connected with the control valve.

7. The temperature control system of a continuous hot press according to claim 1, wherein: A pressure sensor is arranged between the second end of the circulating pump and the pressure mold end.

8. A temperature control system for a continuous hot press according to claim 7, wherein: The measurement range of the pressure sensor is 0bar-25bar.

9. The temperature control system of a continuous hot press according to claim 1, wherein: An air inlet switch, an air outlet switch and an oil inlet are arranged on the oil tank.

10. The temperature control system of a continuous hot press according to claim 1, wherein: An over-temperature controller is arranged on the electric control box.

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