Polyurethane material temperature control device and method

Abstract

The present application provides a polyurethane material temperature control device and method. The polyurethane material temperature control device comprises: a first self-storage tank, a second self-storage tank, a first temperature sensor, a second temperature sensor, a first delivery pipe, a second delivery pipe, an injection gun head, a water cooling device, and a controller. The controller is configured to: obtain a first temperature from the first temperature sensor; obtain a second temperature from the second temperature sensor; and, if the first temperature and / or the second temperature exceeds a preset temperature range, send a temperature adjustment instruction to the water cooling device to control the water cooling device to adjust the temperature of the polyurethane material. By placing the first and second temperature sensors near one end of the injection gun head, the temperature of the polyurethane material upon reaching the injection gun head can be more accurately measured. The controller can then adjust the temperature of the polyurethane material in the self-storage tanks, thereby resolving the problem of low polyurethane material temperature control accuracy.

Description

Technical Field

[0001] The present application relates to polyurethane foaming technology, and specifically to a polyurethane temperature control device and method. Background Art

[0002] Polyurethane raw materials are used in the production process of refrigerators and freezers. Polyurethane raw materials are also used to fill the refrigerator cabinets and doors during the production process. Polyurethane raw materials can play a role in insulation and support. There are two types of polyurethane raw materials: one isocyanate and the other is a composite polyether, which contains polyether polyol, catalyst and foaming agent. The two raw materials are stored in their own storage tanks and transported to the injection nozzle through a conveying pipe. They are sprayed out under high pressure from the injection nozzle and injected into the cabinet and door to be foamed. After reaction, foam is formed to play a role in insulation. The temperature of the polyurethane material will affect the degree of reaction between the various raw materials and directly determine the quality of the foam. Therefore, the temperature of the polyurethane material needs to be precisely controlled.

[0003] The method for controlling the temperature of polyurethane material involves wrapping the storage tank and delivery pipeline with insulation material, controlling the temperature through a water cooling circulation system, and placing a temperature sensor inside the storage tank to monitor the temperature in real time. However, the temperature detected by the temperature sensor in this method only measures the temperature of the polyurethane material inside the storage tank. As the polyurethane material is transported through the delivery pipeline to the injection nozzle, its temperature will change, making it impossible to accurately control the temperature of the polyurethane material flowing through the injection nozzle. Summary of the Invention

[0004] The present application provides a polyurethane material temperature control device and method to solve the problem of low accuracy in polyurethane material temperature control.

[0005] In a first aspect, the present application provides a polyurethane material temperature control device, comprising: a first self-storage tank, a second self-storage tank, a first temperature sensor, a second temperature sensor, a first delivery pipeline, a second delivery pipeline, an injection gun head, a water cooling device, and a controller;

[0006] One side of the injection gun head is connected to the first self-storage tank via the first delivery pipe, and the other side of the injection gun head is connected to the second self-storage tank via the second delivery pipe; one end of the first delivery pipe close to the injection gun head is connected to the first temperature sensor; one end of the second delivery pipe close to the injection gun head is connected to the second temperature sensor; the water cooling device is connected to the first delivery pipe and the second delivery pipe respectively; the controller is connected to the first temperature sensor, the second temperature sensor and the water cooling device respectively;

[0007] The controller is used to:

[0008] Acquire a first temperature of the first temperature sensor;

[0009] acquiring a second temperature of the second temperature sensor;

[0010] If the first temperature and / or the second temperature exceeds the preset temperature range, a temperature adjustment instruction is sent to the water cooling device to control the water cooling device to adjust the temperature of the polyurethane material.

[0011] Optionally, the first self-storage tank includes a first discharge port and a first feed port; the second self-storage tank includes a second discharge port and a second feed port; the first conveying pipeline includes a first output pipeline and a first return pipeline; the second conveying pipeline includes a second output pipeline and a second return pipeline; one end of the first output pipeline is connected to the first discharge port, and the other end of the first output pipeline is connected to the injection gun head; one end of the first return pipeline is connected to the first feed port, and the other end of the first return pipeline is connected to the injection gun head; one end of the second output pipeline is connected to the second discharge port, and the other end of the second output pipeline is connected to the injection gun head; one end of the second return pipeline is connected to the second feed port, and the other end of the second return pipeline is connected to the injection gun head.

[0012] Optionally, it further includes a first water pump and a second water pump, wherein the first water pump is connected to the first output pipe; and the second water pump is connected to the second output pipe.

[0013] Optionally, the water cooling device is connected to the first return pipe and the second return pipe respectively.

[0014] Optionally, the controller is further configured to:

[0015] In response to a device startup instruction, an initial temperature setting instruction is sent to the water cooling device so that the initial temperature of the water cooling device is a middle value of the preset temperature range.

[0016] Optionally, the controller is further configured to:

[0017] Calculating the difference between the first temperature and the second temperature and the initial temperature respectively to generate a temperature adjustment instruction;

[0018] The temperature adjustment instruction is sent to the water cooling device to control the water cooling device to increase or decrease the temperature of the difference.

[0019] Optionally, the controller is further configured to:

[0020] If the first temperature and the second temperature are within the preset temperature range, then the duration of the first temperature and the second temperature being within the preset temperature range is recorded;

[0021] If the duration is greater than a preset time threshold, an initial temperature setting instruction is sent to the water cooling device to set the temperature of the water cooling device to an initial temperature.

[0022] In a second aspect, the present application further provides a polyurethane material temperature control method, which is applied to the above-mentioned polyurethane material temperature control device, and the method comprises:

[0023] Acquire a first temperature of a first temperature sensor;

[0024] Acquire a second temperature of a second temperature sensor;

[0025] If the first temperature and / or the second temperature exceeds a preset temperature range, a temperature adjustment instruction is sent to the water cooling device to control the water cooling device to adjust the temperature of the polyurethane material.

[0026] Optionally, the method further includes:

[0027] Calculating the difference between the first temperature and the second temperature and the initial temperature respectively to generate a temperature adjustment instruction;

[0028] The temperature adjustment instruction is sent to the water cooling device to control the water cooling device to increase or decrease the temperature of the difference.

[0029] If the first temperature and the second temperature are within the preset temperature range, then the duration of the first temperature and the second temperature being within the preset temperature range is recorded;

[0030] If the duration is greater than a preset time threshold, an initial temperature setting instruction is sent to the water cooling device to set the temperature of the water cooling device to the initial temperature.

[0031] It can be seen from the above technical solution that the present application provides a polyurethane material temperature control device and method, which includes: a first self-storage tank, a second self-storage tank, a first temperature sensor, a second temperature sensor, a first conveying pipe, a second conveying pipe, an injection gun head, a water cooling device and a controller; one side of the injection gun head is connected to the first self-storage tank through the first conveying pipe, and the other side of the injection gun head is connected to the second self-storage tank through the second conveying pipe; the end of the first conveying pipe close to the injection gun head is connected to the first temperature sensor; the end of the second conveying pipe close to the injection gun head is connected to the second temperature sensor; the water cooling device is respectively connected to the first conveying pipe and the second conveying pipe; the controller is respectively connected to the first temperature sensor, the second temperature sensor and the water cooling device; the controller is used to: obtain the first temperature of the first temperature sensor; obtain the second temperature of the second temperature sensor; if the first temperature and / or the second temperature exceeds the preset temperature range, send a temperature adjustment instruction to the water cooling device to control the water cooling device to adjust the temperature of the polyurethane material. By setting the first temperature sensor and the second temperature sensor at one end close to the injection gun head, the temperature of the polyurethane material when it reaches the injection gun head can be obtained more accurately, and the temperature of the polyurethane material in the storage tank can be adjusted by the controller to solve the problem of low accuracy of polyurethane material temperature control. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0033] Figure 1 A schematic structural diagram of a polyurethane temperature control device provided in an embodiment of the present application;

[0034] Figure 2 A temperature control flow chart of a polyurethane temperature control device provided in an embodiment of the present application;

[0035] Figure 3 Flowchart of the polyurethane temperature control method provided in the embodiment of the present application;

[0036] Figure 4 This is a flow chart for adjusting the temperature of polyurethane material provided in an embodiment of the present application.

[0037] Reference numerals:

[0038] Among them, 1-first self-storage tank; 2-second self-storage tank; 3-first temperature sensor; 4-second temperature sensor; 5-first delivery pipeline; 6-second delivery pipeline; 7-injection gun head; 8-water cooling device; 11-first discharge port; 12-first feed port; 13-first water pump; 14-second water pump; 21-second discharge port; 22-second feed port; 51-first output pipeline; 52-first reflux pipeline; 61-second output pipeline; 62-second reflux pipeline. DETAILED DESCRIPTION

[0039] The following embodiments are described in detail, with examples illustrated in the accompanying drawings. When the following description refers to the drawings, identical numbers in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following embodiments are not intended to represent all possible implementations consistent with the present application. They are merely examples of systems and methods consistent with certain aspects of the present application, as detailed in the claims.

[0040] During refrigerator production, polyurethane is used to fill the refrigerator cabinet and doors for insulation and support. Polyurethane is composed of multiple raw materials. After mixing, these materials undergo a reaction to form foam. When the temperature of the polyurethane material is higher or lower than the catalytic reaction temperature, incomplete reaction can lead to poor foam quality. Therefore, the temperature of the polyurethane material must be controlled. In some embodiments, a temperature sensor is installed in the raw material storage tank to monitor the temperature. Using a water-cooling device to adjust the temperature cannot achieve precise temperature control.

[0041] In order to achieve the purpose of accurately controlling the temperature of the polyurethane material, some embodiments of the present application provide a polyurethane material temperature control device, see Figure 1 , Figure 2 The polyurethane material temperature control device includes: a first self-storage tank 1, a second self-storage tank 2, a first temperature sensor 3, a second temperature sensor 4, a first delivery pipeline 5, a second delivery pipeline 6, a material injection gun head 7, a water cooling device 8 and a controller.

[0042] One side of the injection gun head 7 is connected to the first self-storage tank 1 through the first delivery pipe 5, and the other side of the injection gun head 7 is connected to the second self-storage tank 2 through the second delivery pipe 6; the end of the first delivery pipe 5 close to the injection gun head 7 is connected to the first temperature sensor 3; the end of the second delivery pipe 6 close to the injection gun head 7 is connected to the second temperature sensor 4; the water cooling device 8 is respectively connected to the first delivery pipe 5 and the second delivery pipe 6; the controller is respectively connected to the first temperature sensor 3, the second temperature sensor 4 and the water cooling device 8.

[0043] The first self-storage tank 1 is used to store isocyanate, and the second self-storage tank 2 is used to store the composite polyether. The first self-storage tank 1 is connected to the injection gun head 7 via a first delivery pipe 5, and the second self-storage tank 2 is connected to the injection gun head 7 via a second delivery pipe 6. During use, the raw materials in the first and second self-storage tanks 1 and 2 can be transported to the injection gun head 7 through the first and second delivery pipes 5 and 6 and then discharged. At the same time, the first temperature sensor 3 can detect the temperature of the raw materials in the first delivery pipe 5, and the second temperature sensor 4 can detect the temperature of the raw materials in the second delivery pipe 6, and send the detected temperature information to the controller.

[0044] After obtaining the first temperature of the first temperature sensor 3 and the second temperature of the second temperature sensor 4, the controller will determine whether the first temperature and / or the second temperature exceeds the preset temperature range. If the first temperature and / or the second temperature exceeds the preset temperature range, the controller will send a temperature adjustment instruction to the water cooling device 8 to control the water cooling device 8 to adjust the temperature of the polyurethane material.

[0045] For example, a preset temperature range of 18-20 degrees Celsius is first set. The raw materials in the first self-storage tank 1 and the second self-storage tank 2 are respectively transported to the injection gun head 7 through the first delivery pipe 5 and the second delivery pipe 6. At this time, the first temperature sensor 3 detects the temperature at the end of the first delivery pipe 5 in real time, and the second temperature sensor 4 also detects the temperature at the end of the second delivery pipe 6 in real time. In addition, the controller obtains the temperatures detected by the first temperature sensor 3 and the second temperature sensor 4 and compares them with the preset temperature range. When the controller detects that the temperature of the polyurethane material exceeds the preset temperature range, it controls the water cooling device 8 to adjust the temperature of the polyurethane material. Placing the first temperature sensor 3 and the second temperature sensor 4 at the end of the delivery pipe can detect more accurate polyurethane material temperature. The controller can also link the water cooling device 8 with the temperature sensors to facilitate more precise control of the polyurethane material temperature.

[0046] In some embodiments, the first self-storage tank 1 includes a first discharge port 11 and a first feed port 12; the second self-storage tank 2 includes a second discharge port 21 and a second feed port 22; the first conveying pipeline 5 includes a first output pipeline 51 and a first return pipeline 52; the second conveying pipeline 6 includes a second output pipeline 61 and a second return pipeline 62; one end of the first output pipeline 51 is connected to the first discharge port 11, and the other end of the first output pipeline 51 is connected to the injection gun head 7; one end of the first return pipeline 52 is connected to the first feed port 12, and the other end of the first return pipeline 52 is connected to the injection gun head 7; one end of the second output pipeline 61 is connected to the second discharge port 21, and the other end of the second output pipeline 61 is connected to the injection gun head 7; one end of the second return pipeline 62 is connected to the second feed port 22, and the other end of the second return pipeline 62 is connected to the injection gun head 7.

[0047] The raw material in the first self-storage tank 1 flows into the first output pipe 51 through the first discharge port 11. After the raw material in the first output pipe 51 is transported to the injection gun head 7, a portion of the raw material is discharged from the injection gun head 7, and the other portion of the raw material flows from the injection gun head 7 into the first return pipe 52, passes through the first return pipe 52, and returns to the first self-storage tank 1 through the first feed port 12. The raw material in the second self-storage tank 2 flows into the second output pipe 61 through the second discharge port 21. After the raw material in the second output pipe 61 is transported to the injection gun head 7, a portion of the raw material is discharged from the injection gun head 7, and the other portion of the raw material flows from the injection gun head 7 into the second return pipe 62, passes through the second return pipe 62, and then returns to the second self-storage tank 2 through the second feed port 22. By providing the first return pipe 52 and the second return pipe 62, a portion of the polyurethane material can be re-transported to the self-storage tanks, which facilitates the control of the temperature of the polyurethane material.

[0048] In some embodiments, the first output pipe 51 is provided with a first water pump 13, and the second output pipe 61 is provided with a second water pump 14. By connecting the water pumps to the first output pipe 51 and the second output pipe 61, the polyurethane material can be easily extracted from the storage tank, the flow rate of the polyurethane material in the first output pipe 51 is increased, and the heat loss of the polyurethane material in the first output pipe 51 is reduced, thereby reducing the temperature change of the polyurethane material.

[0049] In some embodiments, a water cooling device 8 is connected to the first return pipe 52 and the second return pipe 62, respectively. By connecting the first return pipe 52 and the second return pipe 62, respectively, the water cooling device 8 can be used to control the temperature of the polyurethane material in the first self-storage tank 1 and the second self-storage tank 2, respectively. For example, when the first temperature sensor 3 detects that the temperature of the raw material in the first output pipe 51 is within a preset temperature range, and the second temperature sensor detects that the temperature of the raw material in the second output pipe 61 is higher than the preset temperature range, the controller can control the water cooling device 8 to reduce the temperature of the polyurethane material in the second return pipe 62, thereby reducing the temperature of the raw material in the second self-storage tank 2 and controlling the temperature of the raw material in the second self-storage tank 2 back to the preset temperature range. By connecting the first return pipe 52 and the second return pipe 62, respectively, the temperature of the polyurethane material in the first self-storage tank 1 and the second self-storage tank 2 can be controlled, respectively, facilitating the control of maintaining the temperature of the polyurethane within the preset temperature range.

[0050] The controller adjusts the temperature of the polyurethane material by controlling the water cooling device 8. Figure 4 The process of the controller controlling the water cooling device 8 to adjust the temperature of the polyurethane material includes:

[0051] In response to the device startup instruction, an initial temperature setting instruction is sent to the water cooling device 8 so that the initial temperature of the water cooling device 8 is a middle value of the preset temperature range.

[0052] Calculating the difference between the first temperature and the second temperature and the initial temperature respectively to generate a temperature adjustment instruction;

[0053] A temperature adjustment instruction is sent to the water cooling device 8 to control the water cooling device 8 to increase or decrease the temperature of the difference.

[0054] If the first temperature and the second temperature are within the preset temperature range, then the duration of the first temperature and the second temperature being within the preset temperature range is recorded;

[0055] If the duration is greater than the preset time threshold, an initial temperature setting instruction is sent to the water cooling device 8 to set the temperature of the water cooling device 8 to the initial temperature.

[0056] When the polyurethane material temperature control device is activated, the controller receives the activation signal and sends an initial temperature setting instruction to the water cooling device 8, setting the initial temperature of the water cooling device 8 to a value in the middle of the preset temperature range. For example, if the preset temperature range is 18-20 degrees Celsius, the controller can control the water cooling device 8 to set the initial temperature of the water cooling device 8 to 19 degrees Celsius.

[0057] The first temperature sensor 3 detects the temperature at the end of the first output pipe 51 in real time and transmits the first temperature to the controller. The second temperature sensor 4 detects the temperature at the end of the second output pipe 61 in real time and transmits the second temperature to the controller. After obtaining the first and second temperatures, the controller calculates the difference between the first and second temperatures and the initial temperature, generates a temperature adjustment instruction based on the difference, and then controls the water cooling device 8 to increase or decrease the temperature by the difference. For example, if the initial temperature of the water cooling device 8 is 19 degrees Celsius, the first temperature is 25 degrees Celsius, and the second temperature is 16 degrees Celsius, then the difference between the first temperature and the initial temperature is 6 degrees Celsius, and the difference between the second temperature and the initial temperature is 3 degrees Celsius. In this case, the controller sends a temperature adjustment instruction to reduce the temperature of the water cooling device 8 on the side connected to the first return pipe 52 by 6 degrees Celsius and to increase the temperature of the water cooling device 8 on the side connected to the second return pipe 62 by 3 degrees Celsius.

[0058] It is understandable that when the temperature of the polyurethane material is adjusted by the water cooling device 8, the difference changes with the change of the first temperature and the second temperature. Therefore, in the process of adjusting the temperature, the temperature of the water cooling device 8 also changes continuously with the difference.

[0059] After water cooling device 8 changes its initial temperature for temperature adjustment, the controller, upon receiving confirmation that the first and second temperatures are within a preset temperature range, records the duration of the first and second temperatures remaining within the preset temperature range. If the duration of the first and second temperatures remaining within the preset temperature range exceeds a preset time threshold, the controller controls water cooling device 8 to return to the initial temperature. In this embodiment, the preset time threshold is 30 minutes; the controller controls water cooling device 8 to return to the initial temperature only after the first and second temperatures remain within the preset temperature range for 30 minutes. Placing the temperature detection point at the end of the output pipe allows for more precise temperature detection and control. Linking the controller, water cooling device 8, and temperature sensor enables automatic temperature regulation of the polyurethane material, improving operational efficiency.

[0060] In some embodiments, as Figure 3 As shown, the present application also provides a polyurethane material temperature control method, comprising:

[0061] Acquire a first temperature of the first temperature sensor 3;

[0062] Acquire a second temperature of the second temperature sensor 3;

[0063] If the first temperature and / or the second temperature exceeds the preset temperature range, a temperature adjustment instruction is sent to the water cooling device 8 to control the water cooling device 8 to adjust the temperature of the polyurethane material.

[0064] The first temperature sensor 3 and the second temperature sensor 4 are used to detect the temperature of the polyurethane material in real time. When the temperature of the polyurethane material exceeds a preset temperature range, the temperature of the polyurethane material can be adjusted promptly by the water cooling device 8. The polyurethane material temperature control method further includes:

[0065] Calculating the difference between the first temperature and the second temperature and the initial temperature to generate a temperature adjustment instruction;

[0066] A temperature adjustment instruction is sent to the water cooling device 8 to control the water cooling device 8 to increase or decrease the temperature of the difference.

[0067] If the first temperature and the second temperature are within the preset temperature range, then the duration of the first temperature and the second temperature being within the preset temperature range is recorded;

[0068] If the duration is greater than the preset time threshold, an initial temperature setting instruction is sent to the water cooling device 8 to set the temperature of the water cooling device 8 to the initial temperature.

[0069] It can be seen from the above technical scheme that the present application provides a polyurethane material temperature control device and method, which includes: a first self-storage tank 1, a second self-storage tank 2, a first temperature sensor 3, a second temperature sensor 4, a first conveying pipe 5, a second conveying pipe 6, an injection gun head 7, a water cooling device 8 and a controller; one side of the injection gun head 7 is connected to the first self-storage tank 1 through the first conveying pipe 5, and the other side of the injection gun head 7 is connected to the second self-storage tank 2 through the second conveying pipe 6; the end of the first conveying pipe 5 close to the injection gun head 7 is connected to the first temperature sensor 3; the end of the second conveying pipe 6 close to the injection gun head 7 is connected to the second temperature sensor 4; the water cooling device 8 is respectively connected to the first conveying pipe 5 and the second conveying pipe 6; the controller is respectively connected to the first temperature sensor 3, the second temperature sensor 4 and the water cooling device 8; the controller is used to: obtain the first temperature of the first temperature sensor 3; obtain the second temperature of the second temperature sensor 4; if the first temperature and / or the second temperature exceeds the preset temperature range, send a temperature adjustment instruction to the water cooling device 8 to control the water cooling device 8 to adjust the temperature of the polyurethane material. By setting the first temperature sensor 3 and the second temperature sensor 4 at one end close to the injection gun head 7, the temperature of the polyurethane material when it reaches the injection gun head 7 can be obtained more accurately, and the temperature of the polyurethane material in the storage tank can be adjusted by the controller to solve the problem of low accuracy of polyurethane material temperature control.

[0070] Similar parts between the embodiments provided in this application can be referenced to each other. The specific implementation methods provided above are only a few examples under the overall concept of this application and do not constitute a limitation on the scope of protection of this application. For those skilled in the art, any other implementation methods expanded based on the scheme of this application without expending creative work shall fall within the scope of protection of this application.

Claims

1. A polyurethane material temperature control device, characterized in that: include: A first self-storage tank (1), a second self-storage tank (2), a first temperature sensor (3), a second temperature sensor (4), a first delivery pipeline (5), a second delivery pipeline (6), a material injection gun head (7), a water cooling device (8), and a controller; One side of the injection gun head (7) is connected to the first self-storage tank (1) through the first delivery pipe (5), and the other side of the injection gun head (7) is connected to the second self-storage tank (2) through the second delivery pipe (6); one end of the first delivery pipe (5) close to the injection gun head (7) is connected to the first temperature sensor (3); one end of the second delivery pipe (6) close to the injection gun head (7) is connected to the second temperature sensor (4); the water cooling device (8) is respectively connected to the first delivery pipe (5) and the second delivery pipe (6); the controller is respectively connected to the first temperature sensor (3), the second temperature sensor (4) and the water cooling device (8); The controller is used to: Acquiring a first temperature of the first temperature sensor (3); Acquiring a second temperature of the second temperature sensor (4); If the first temperature and / or the second temperature exceeds a preset temperature range, a temperature adjustment instruction is sent to the water cooling device (8) to control the water cooling device (8) to adjust the temperature of the polyurethane material; The controller is also used for: In response to a device startup instruction, an initial temperature setting instruction is sent to the water cooling device (8) so that the initial temperature of the water cooling device (8) is a middle value of the preset temperature range; Calculating the difference between the first temperature and the second temperature and the initial temperature respectively to generate a temperature adjustment instruction; Sending the temperature adjustment instruction to the water cooling device (8) to control the water cooling device (8) to increase or decrease the temperature of the difference; If the first temperature and the second temperature are within the preset temperature range, then the duration of the first temperature and the second temperature being within the preset temperature range is recorded; If the duration is greater than a preset time threshold, an initial temperature setting instruction is sent to the water cooling device (8) to set the temperature of the water cooling device (8) to the initial temperature.

2. The polyurethane material temperature control device according to claim 1, characterized in that: The first self-storage tank (1) includes a first discharge port (11) and a first feed port (12); the second self-storage tank (2) includes a second discharge port (21) and a second feed port (22); the first conveying pipeline (5) includes a first output pipeline (51) and a first return pipeline (52); the second conveying pipeline (6) includes a second output pipeline (61) and a second return pipeline (62); one end of the first output pipeline (51) is connected to the first discharge port (11), and the other end of the first output pipeline (51) is connected to the injection port (11). The first reflux pipe (52) is connected to the first feed port (12), and the other end of the first reflux pipe (52) is connected to the injection gun head (7); one end of the second output pipe (61) is connected to the second discharge port (21), and the other end of the second output pipe (61) is connected to the injection gun head (7); one end of the second reflux pipe (62) is connected to the second feed port (22), and the other end of the second reflux pipe (62) is connected to the injection gun head (7).

3. The polyurethane material temperature control device according to claim 2, characterized in that: It also includes a first water pump (13) and a second water pump (14), wherein the first water pump (13) is connected to the first output pipe (51); and the second water pump (14) is connected to the second output pipe (61).

4. The polyurethane material temperature control device according to claim 2, characterized in that: The water cooling device (8) is respectively connected to the first return pipe (52) and the second return pipe (62).

5. A polyurethane material temperature control method, characterized in that: The polyurethane material temperature control device according to any one of claims 1 to 4, wherein the method comprises: Acquiring a first temperature of a first temperature sensor (3); Acquiring a second temperature of a second temperature sensor (4); If the first temperature and / or the second temperature exceeds a preset temperature range, a temperature adjustment instruction is sent to the water cooling device (8) to control the water cooling device (8) to adjust the temperature of the polyurethane material.

6. The polyurethane material temperature control method according to claim 5, characterized in that: The method further comprises: Calculating the difference between the first temperature and the second temperature and the initial temperature respectively to generate a temperature adjustment instruction; Sending the temperature adjustment instruction to the water cooling device (8) to control the water cooling device (8) to increase or decrease the temperature of the difference; If the first temperature and the second temperature are within the preset temperature range, then the duration of the first temperature and the second temperature being within the preset temperature range is recorded; If the duration is greater than a preset time threshold, an initial temperature setting instruction is sent to the water cooling device (8) to set the temperature of the water cooling device (8) to the initial temperature.

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