A temperature control system and method for a tread and sidewall production line

Abstract

The present invention discloses a temperature control system and method for a tread and sidewall production line. The system includes a conveying and transmission unit, a spraying unit, a temperature detection unit, and a central controller. The central controller is configured to: when receiving a first temperature sent by a current temperature detection element during the conveying and transmission process, determine whether the first temperature is greater than a preset temperature upper limit; if so, determine the number N of opened spray heads according to the difference between the first temperature and the preset temperature upper limit; open N target spray heads corresponding to the current temperature detection element, and obtain a new first temperature from a target temperature detection element; wherein, each target spray head is the 1st to Nth spray head located behind the current temperature detection element in the conveying and transmission direction, and the target temperature element is the Nth temperature detection element located behind the current temperature detection element in the conveying and transmission direction, so as to more accurately control the offline temperature of the tread / sidewall, thereby improving the tire production quality.

Description

Technical Field

[0001] The present application relates to the field of tire manufacturing, and more specifically, to a temperature control system and method for a tread and sidewall production line. Background Art

[0002] In the production process of tire treads / sidewalls, it is necessary to cool the outgoing treads / sidewalls. At present, water spraying is generally used in the prior art, and a small part uses water immersion for cooling.

[0003] When using water spraying for cooling, the cooling water can only partially or mostly cover the tread, and cannot fully play the role of condensation, resulting in insufficient condensation, which is not conducive to the control of the outgoing temperature.

[0004] When using water immersion for cooling, the manufacturing consumables of the experimental device are large and the cost is high. Especially for treads and sidewalls, if the final production becomes a formed tire and the temperature control does not meet the requirements, it will pose a great potential safety hazard.

[0005] Therefore, how to further accurately control the outgoing temperature of the tread / sidewall, and thus improve the tire production quality, is a technical problem to be solved at present. Summary of the Invention

[0006] The embodiments of the present application provide a temperature control system and method for a tread and sidewall production line to solve the technical problem that the outgoing temperature of the tread / sidewall cannot be accurately controlled in the prior art.

[0007] In a first aspect, a temperature control system for a tread and sidewall production line is provided, including:

[0008] A conveying and transferring unit for conveying and transferring a tire film on a spraying production line, the tire film including a tread or a sidewall;

[0009] A spraying unit including a plurality of spray heads, each of the spray heads being distributed above the conveying and transferring unit along the conveying and transferring direction, and the spraying unit being used for performing coolant spraying to reduce the temperature of the tire film during the conveying and transferring process;

[0010] A temperature detection unit including a plurality of temperature detection elements, each of the temperature detection elements being alternately arranged with the spray head in the conveying and transferring direction, and the temperature detection unit being used for detecting the temperature of the tire film during the conveying and transferring process;

[0011] A central controller for:

[0012] When receiving a first temperature sent by a current temperature detection element during the conveying and transferring process, determining whether the first temperature is greater than a preset temperature upper limit;

[0013] If so, determine the number N of opened spray heads according to the difference between the first temperature and the preset upper temperature limit;

[0014] Open N target spray heads corresponding to the current temperature detection element, and obtain a new first temperature from the target temperature detection element;

[0015] Wherein, each of the target spray heads is the 1st to Nth spray heads located behind the current temperature detection element in the conveying direction, and the target temperature element is the Nth temperature detection element located behind the current temperature detection element in the conveying direction.

[0016] In some embodiments, the spraying part further includes:

[0017] A coolant pipeline for inputting coolant from a coolant inlet and communicating with each of the spray heads respectively;

[0018] A first cooling pump for pumping the coolant from the coolant outlet on the conveying and transporting part into the first liquid storage tank;

[0019] The first liquid storage tank for storing the coolant pumped by the first cooling pump;

[0020] A cooling device for cooling the coolant flowing in from the first liquid storage tank and inputting the cooled coolant into the second liquid storage tank;

[0021] The second liquid storage tank for supplying the cooled coolant to the second cooling pump;

[0022] The second cooling pump for pumping the coolant in the second liquid storage tank into the coolant inlet;

[0023] Wherein, the outlet of the first cooling pump, the first liquid storage tank, the cooling device, the second liquid storage tank and the inlet of the second cooling pump are connected in sequence, the inlet of the first cooling pump is connected to the coolant outlet, and the outlet of the second cooling pump is connected to the coolant inlet.

[0024] In some embodiments, the conveying and transporting part includes:

[0025] A conveying and transporting surface formed by a plurality of driving rollers;

[0026] A chain belt for driving each driving roller to rotate;

[0027] A motor for driving the chain belt to rotate.

[0028] In some embodiments, the materials of both the driving roller and the spray head are 304 stainless steel.

[0029] In some embodiments, each of the spray heads is uniformly distributed above the carrier transport part along the carrier transport direction, and the distance between each temperature detection element and the adjacent spray head is equal.

[0030] In some embodiments, the carrier transport part includes a first part and a second part with equal transport distances, and the spray part includes two groups, and each group of spray parts respectively matches the first part and the second part.

[0031] In a second aspect, a method for controlling the temperature of a tread and sidewall production line is provided, which is applied to the system as described above. The method includes:

[0032] When receiving the first temperature sent by the current temperature detection element during the carrier transport process, the central controller determines whether the first temperature is greater than the preset temperature upper limit;

[0033] If so, the central controller determines the number N of spray heads to be opened according to the difference between the first temperature and the preset temperature upper limit;

[0034] The central controller opens N target spray heads corresponding to the current temperature detection element, and obtains a new first temperature from the target temperature detection element;

[0035] Wherein, each of the target spray heads is the 1st to Nth spray heads located behind the current temperature detection element in the carrier transport direction, and the target temperature element is the Nth temperature detection element located behind the current temperature detection element in the carrier transport direction.

[0036] In some embodiments, after the central controller obtains a new first temperature from the target temperature detection element, the method further includes:

[0037] If the new first temperature is not greater than the preset temperature upper limit, the central controller closes each of the target spray heads and sets N to 1.

[0038] In some embodiments, the central controller determines the number N of spray heads to be opened according to the difference between the first temperature and the preset temperature upper limit, specifically:

[0039] The central controller queries a preset relationship table according to the difference and determines the number N of spray heads to be opened according to the query result;

[0040] Wherein, the preset relationship table is established according to the corresponding relationship between different differences and different numbers of spray heads to be opened.

[0041] In some embodiments, after the central controller determines whether the first temperature is greater than the preset temperature upper limit, the method further includes:

[0042] Otherwise, the central controller will use the first temperature detection element that is behind the current temperature detection element in the conveying and transporting direction as the target temperature detection element, and obtain a new first temperature.

[0043] By applying the above technical solution, the temperature control system of the tire spraying production line includes a conveying and transporting unit, a spraying unit, a temperature detection unit, and a central controller. The central controller is configured to: when receiving the first temperature sent by the current temperature detection element during the conveying and transporting process, determine whether the first temperature is greater than the preset temperature upper limit; if so, determine the number N of opened spray heads according to the difference between the first temperature and the preset temperature upper limit; open the N target spray heads corresponding to the current temperature detection element, and obtain a new first temperature from the target temperature detection element; wherein, each target spray head is the 1st to Nth spray head that is behind the current temperature detection element in the conveying and transporting direction, and the target temperature element is the Nth temperature detection element that is behind the current temperature detection element in the conveying and transporting direction, so as to more accurately control the offline temperature of the tread / sidewall, and further improve the tire production quality. Description of the Drawings

[0044] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following described drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0045] Figure 1 Shows a schematic structural diagram of a temperature control system for a tire spraying production line proposed in an embodiment of the present invention;

[0046] Figure 2 Shows a schematic structural diagram of a temperature control system for a tire spraying production line proposed in another embodiment of the present invention;

[0047] Figure 3 Shows Figure 2 The first axonometric view of

[0048] Figure 4 Shows Figure 2 The second axonometric view of

[0049] Figure 5 Shows a schematic flowchart of a temperature control method for a tread and sidewall production line proposed in an embodiment of the present invention;

[0050] Figure 6 Shows a schematic flowchart of a temperature control method for a tread and sidewall production line proposed in another embodiment of the present invention.

[0051] Figures 2-4Among them, 1. Driving roller; 2. Temperature detection element; 3. Spraying head; 4. Coolant outlet; 5. Coolant inlet; 6. First cooling pump; 7. First liquid storage tank; 8. Cooling device; 9. Second liquid storage tank; 10. Second cooling pump; 11. Coolant pipeline. Detailed implementation mode

[0052] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0053] The embodiment of the present application provides a temperature control system for a tire spraying production line, as Figure 1 and Figure 2 shown, including:

[0054] A carrier transmission unit 100 for transporting and transmitting tire films on a spraying production line, and the tire films include treads or sidewalls;

[0055] A spraying unit 200 includes a plurality of spraying heads 3, and each spraying head 3 is distributed above the carrier transmission unit 100 along the carrier transmission direction. The spraying unit 200 is used for performing coolant spraying to reduce the temperature of the tire film during the carrier transmission process;

[0056] A temperature detection unit 300 includes a plurality of temperature detection elements 2, and each temperature detection element 2 is alternately arranged with the spraying head 3 in the carrier transmission direction. The temperature detection unit 300 is used for detecting the temperature of the tire film during the carrier transmission process;

[0057] A central controller 400 is used for:

[0058] When receiving the first temperature sent by the current temperature detection element during the carrier transmission process, determine whether the first temperature is greater than the preset temperature upper limit;

[0059] If so, determine the number N of spraying heads to be opened according to the difference between the first temperature and the preset temperature upper limit;

[0060] Open the N target spraying heads corresponding to the current temperature detection element, and obtain a new first temperature from the target temperature detection element;

[0061] Among them, each target spraying head is the 1st to Nth spraying heads located behind the current temperature detection element in the carrier transmission direction, and the target temperature element is the Nth temperature detection element located behind the current temperature detection element in the carrier transmission direction.

[0062] In the embodiments of the present application, the transmission path type of the carrier transmission unit 100 can be selected as needed, such as a straight line type or a curve type. When the tire film is transmitted on the carrier transmission unit 100, each temperature detection element 2 in the temperature detection unit 300 sends the detected temperature to the central controller 400, and the central controller 400 controls each spray head 3 in the spray unit 200 according to the temperature to accurately control the offline temperature of the tread / sidewall of the tire. The coolant can be water or other cooling media.

[0063] The central controller 400 obtains the first temperature during the carrier transmission process from the current temperature detection element. If the first temperature is greater than the preset temperature upper limit, it indicates that the temperature of the tire film is too high and cooling is required. First, determine the number N of spray heads to be opened according to the difference between the first temperature and the preset temperature upper limit, that is, different differences correspond to different opening numbers N, and then open N target spray heads corresponding to the current temperature detection element. Each target spray head is the 1st to Nth spray head after the current temperature detection element. For example, if the difference is 0 - 5 degrees, 1 spray head is opened; if the difference is 30 - 35 degrees, 10 spray heads are opened; if the difference is 35 - 40 degrees, 11 spray heads are opened, and so on.

[0064] After opening the N target spray heads corresponding to the current temperature detection element, the tire film continues to be transmitted in the carrier transmission direction, and the central controller continues to obtain a new first temperature from the target temperature detection element and re - judge whether the new first temperature is greater than the preset temperature upper limit. The target temperature element is the Nth temperature detection element after the current temperature detection element in the carrier transmission direction. For example, if the current temperature detection element is the 1st temperature detection element, the target temperature element is the (N + 1)th temperature detection element.

[0065] It can be understood that if the first temperature is not greater than the preset temperature upper limit, the central controller 400 keeps the target spray heads closed, thereby avoiding unnecessary opening and saving coolant.

[0066] In order to facilitate the operator to observe the production line status at any time, in some embodiments of the present application, the carrier transmission unit 100 is designed to be open - air.

[0067] In order to improve the reliability of the spray unit 200, in some embodiments of the present application, as Figures 2-4 shown, the spray unit 200 further includes:

[0068] The coolant pipeline 11, which inputs coolant from the coolant inlet 5 and is respectively connected to each spray head 3;

[0069] The first cooling pump 6, which is used to pump the coolant from the coolant outlet 4 on the carrier transmission unit 100 into the first liquid storage tank 7;

[0070] The first liquid storage tank 7 is used to store the coolant pumped in by the first cooling pump 6;

[0071] The cooling device 8 is used to cool the coolant flowing in from the first liquid storage tank 7 and input the cooled coolant into the second liquid storage tank 9;

[0072] The second liquid storage tank 9 is used to supply the cooled coolant to the second cooling pump 10;

[0073] The second cooling pump 10 is used to pump the coolant in the second liquid storage tank 9 into the coolant inlet 5;

[0074] Among them, the outlet of the first cooling pump 6, the first liquid storage tank 7, the cooling device 8, the second liquid storage tank 9 and the inlet of the second cooling pump 10 are connected in sequence. The inlet of the first cooling pump 6 is connected to the coolant outlet 4, and the outlet of the second cooling pump 10 is connected to the coolant inlet 5.

[0075] In this embodiment, the coolant sprayed by each spray head 3 is recovered to the coolant outlet 4. The first cooling pump 6 provides power to pump the coolant at the coolant outlet 4 into the first liquid storage tank 7. After being cooled by the cooling device 8, it enters the second liquid storage tank 9. The second cooling pump 10 provides power to pump the coolant into the coolant inlet 5. Then the coolant enters the coolant pipeline 11, thereby realizing the recycling of the coolant, saving the coolant, and further saving costs.

[0076] Optionally, in order to ensure the cleanliness of the coolant and avoid clogging the spray head 3, in some embodiments of the present application, the spraying part 200 further includes:

[0077] A filtering device is arranged between the coolant outlet 4 and the first cooling pump 6 and is used to filter the coolant at the coolant outlet 4.

[0078] In order to improve the reliability of the carrier transmission part 100, in some embodiments of the present application, as Figure 2 shown, the carrier transmission part 100 includes:

[0079] A carrier transmission surface formed by a plurality of transmission rollers 1;

[0080] A chain belt is used to drive each transmission roller 1 to rotate;

[0081] A motor is used to drive the chain belt to rotate.

[0082] Those skilled in the art can adopt other transmission structures according to actual needs, which does not affect the protection scope of the present application.

[0083] In order to improve the reliability of the system, in some embodiments of the present application, the materials of the transmission roller 1 and the spray head 3 are both 304 stainless steel.

[0084] Those skilled in the art can adopt other types of materials according to actual needs, which does not affect the protection scope of this application.

[0085] In some embodiments of this application, in order to perform temperature control more accurately, each spray head 3 is evenly distributed above the carrier transmission part 100 along the carrier transmission direction, and the distance between each temperature detection element 2 and the adjacent spray head 3 is equal.

[0086] In some embodiments of this application, in order to improve the reliability of the system, as Figures 2-4 shown, the carrier transmission part 100 includes a first part and a second part with equal transmission distances, and the spray part 200 includes two groups, and each group of spray parts 200 is respectively matched with the first part and the second part.

[0087] By applying the above technical solutions, the temperature control system of the tire spray production line includes a carrier transmission part, a spray part, a temperature detection part, and a central controller. The central controller is used for: when receiving the first temperature sent by the current temperature detection element during the carrier transmission, determining whether the first temperature is greater than the preset temperature upper limit; if so, determining the opening number N of the spray heads according to the difference between the first temperature and the preset temperature upper limit; opening the N target spray heads corresponding to the current temperature detection element, and obtaining a new first temperature from the target temperature detection element; wherein, each target spray head is the 1st to Nth spray heads located behind the current temperature detection element in the carrier transmission direction, and the target temperature element is the Nth temperature detection element located behind the current temperature detection element in the carrier transmission direction, so as to more accurately control the offline temperature of the tread / sidewall, and further improve the tire production quality.

[0088] The embodiments of this application also propose a temperature control method for the tread and sidewall production line, which is applied to the system as described above, as Figure 5 shown, the method includes the following steps:

[0089] Step S101, when receiving the first temperature sent by the current temperature detection element during the carrier transmission, the central controller determines whether the first temperature is greater than the preset temperature upper limit;

[0090] Step S102, if so, the central controller determines the opening number N of the spray heads according to the difference between the first temperature and the preset temperature upper limit;

[0091] Step S103, the central controller opens the N target spray heads corresponding to the current temperature detection element, and obtains a new first temperature from the target temperature detection element;

[0092] Among them, each of the target spray heads is the 1st to Nth spray head located behind the current temperature detection element in the transport direction, and the target temperature element is the Nth temperature detection element located behind the current temperature detection element in the transport direction.

[0093] In order to perform temperature control more accurately, in some embodiments of the present application, after the central controller obtains a new first temperature from the target temperature detection element, the method further includes:

[0094] If the new first temperature is not greater than the preset temperature upper limit, the central controller turns off each of the target spray heads and sets N to 1.

[0095] In this embodiment, after the central controller obtains a new first temperature from the target temperature detection element, it determines whether the new first temperature is greater than the preset temperature upper limit. If not, it means that the temperature of the tire film is not high and there is no need to continue cooling. The central controller turns off each of the already opened target spray heads and sets N to 1, so as to use the 1st temperature detection element located behind the current temperature detection element in the transport direction as the target temperature element and obtain a new first temperature.

[0096] In order to accurately determine the opening number N, in some embodiments of the present application, the central controller determines the opening number N of the spray heads according to the difference between the first temperature and the preset temperature upper limit, specifically:

[0097] The central controller queries a preset relationship table according to the difference and determines the opening number N according to the query result;

[0098] Among them, the preset relationship table is established according to the corresponding relationship between different differences and different opening numbers.

[0099] In this embodiment, a preset relationship table is established in advance according to the corresponding relationship between different differences and different opening numbers. After the central controller queries the preset relationship table according to the difference, it can determine the opening number N.

[0100] In order to perform temperature control more accurately, in some embodiments of the present application, after the central controller determines whether the first temperature is greater than the preset temperature upper limit, the method further includes:

[0101] If not, the central controller uses the first temperature detection element located behind the current temperature detection element in the transport direction as the target temperature detection element and obtains a new first temperature.

[0102] In this embodiment, if the first temperature is not greater than the preset temperature upper limit, it means that the temperature of the tire film is not high and there is no need to cool it. The central controller continues to obtain the temperature sent by the next temperature detection element.

[0103] By applying the above technical solution, the temperature control system of the tire spraying production line includes a carrier transmission unit, a spraying unit, a temperature detection unit and a central controller. When receiving the first temperature sent by the current temperature detection element during the carrier transmission process, the central controller determines whether the first temperature is greater than the preset upper temperature limit; if so, the central controller determines the number N of the opened spray heads according to the difference between the first temperature and the preset upper temperature limit; the central controller opens N target spray heads corresponding to the current temperature detection element, and obtains a new first temperature from the target temperature detection element; wherein, each target spray head is the 1st to Nth spray head located behind the current temperature detection element in the carrier transmission direction, and the target temperature element is the Nth temperature detection element located behind the current temperature detection element in the carrier transmission direction, so that the offline temperature of the tread / sidewall can be controlled more accurately, thereby improving the tire production quality.

[0104] An embodiment of the present application also proposes a temperature control method for a tread and sidewall production line, which is applied to the system as described above, as Figure 6 shown, the method includes the following steps:

[0105] Step S201, receiving a start command issued by a user.

[0106] Step S202, starting the carrier transmission unit.

[0107] Step S203, receiving the temperatures sent by each temperature detection element.

[0108] [[ID=ig=19]]Step S204, determining whether the first temperature sent by the current temperature detection element is greater than the preset upper temperature limit. If so, execute step S206; otherwise, execute step S205.

[0109] Step S205, keeping the target spray heads closed.

[0110] Step S206, determining the difference between the first temperature and the preset upper temperature limit.

[0111] Step S207, determining the number N of the opened spray heads according to the difference.

[0112] Step S208, opening N target spray heads after the current temperature detection element.

[0113] Step S209, obtaining a new first temperature from the target temperature detection element.

[0114] The target temperature element is the Nth temperature detection element located behind the current temperature detection element in the carrier transmission direction.

[0115] Step S210, determine whether the new first temperature is greater than the preset upper temperature limit. If it is, execute step S206; otherwise, execute step S211.

[0116] Step S211, close each target sprinkler head, set N to 1, and execute step S209.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A temperature control system for a tread and sidewall production line, characterized in that, The system includes: A conveying and transporting unit for conveying and transporting tire films on a spraying production line, where the tire films include treads or sidewalls; A spraying unit including a plurality of spray heads, and each of the spray heads is distributed above the conveying and transporting unit along the conveying and transporting direction. The spraying unit is used for spraying coolant to reduce the temperature of the tire films during the conveying and transporting process; A temperature detection unit including a plurality of temperature detection elements, and each of the temperature detection elements is alternately arranged with the spray heads in the conveying and transporting direction. The temperature detection unit is used for detecting the temperature of the tire films during the conveying and transporting process; A central controller for: When receiving a first temperature sent by the current temperature detection element during the conveying and transporting process, determining whether the first temperature is greater than a preset temperature upper limit; If so, determining the number N of opened spray heads according to the difference between the first temperature and the preset temperature upper limit; Opening N target spray heads corresponding to the current temperature detection element, and obtaining a new first temperature from the target temperature detection element. If the new first temperature is not greater than the preset temperature upper limit, the central controller closes each of the target spray heads and sets N to 1; Wherein, each of the target spray heads is the 1st to Nth spray heads located behind the current temperature detection element in the conveying and transporting direction, and the target temperature element is the Nth temperature detection element located behind the current temperature detection element in the conveying and transporting direction.

2. The system according to claim 1, wherein The spraying unit further includes: A coolant pipeline for inputting coolant from a coolant inlet and communicating with each of the spray heads respectively; A first cooling pump for pumping the coolant from a coolant outlet on the conveying and transporting unit into a first liquid storage tank; The first liquid storage tank for storing the coolant pumped by the first cooling pump; A cooling device for cooling the coolant flowing in from the first liquid storage tank and inputting the cooled coolant into a second liquid storage tank; The second liquid storage tank for providing the cooled coolant to a second cooling pump; The second cooling pump for pumping the coolant in the second liquid storage tank into the coolant inlet; Wherein, the outlet of the first cooling pump, the first liquid storage tank, the cooling device, the second liquid storage tank and the inlet of the second cooling pump are connected in sequence, the inlet of the first cooling pump is connected to the coolant outlet, and the outlet of the second cooling pump is connected to the coolant inlet.

3. The system according to claim 1, characterized in that, The conveying and transporting unit includes: A conveying and transporting surface formed by a plurality of driving rollers; A chain belt for driving each driving roller to rotate; A motor for driving the chain belt to rotate.

4. The system according to claim 3, wherein The materials of the driving rollers and the spray heads are both 304 stainless steel.

5. The system according to claim 1, wherein Each of the spray heads is evenly distributed above the conveying and transporting unit along the conveying and transporting direction, and the distance between each temperature detection element and the adjacent spray head is equal.

6. The system according to claim 1, wherein The conveying and transporting unit includes a first part and a second part with equal transmission distances, and the spraying unit includes two groups, and each group of spraying units is respectively matched with the first part and the second part.

7. A method for controlling the temperature of a tread and sidewall production line, characterized in that, The method is applied to the system according to any one of claims 1-6, and the method includes: When receiving the first temperature sent by the current temperature detection element during the transportation process, the central controller determines whether the first temperature is greater than the preset upper temperature limit; If so, the central controller determines the opening quantity N of the spray heads according to the difference between the first temperature and the preset upper temperature limit; The central controller turns on N target spray heads corresponding to the current temperature detection element, and obtains a new first temperature from the target temperature detection element; Wherein, each of the target spray heads is the 1st to Nth spray heads located behind the current temperature detection element in the transportation direction, and the target temperature element is the Nth temperature detection element located behind the current temperature detection element in the transportation direction.

8. The method according to claim 7, wherein After the central controller obtains a new first temperature from the target temperature detection element, the method further includes: If the new first temperature is not greater than the preset upper temperature limit, the central controller turns off each of the target spray heads and sets N to 1.

9. The method according to claim 7, wherein The central controller determines the opening quantity N of the spray heads according to the difference between the first temperature and the preset upper temperature limit, specifically: The central controller queries a preset relationship table according to the difference value, and determines the opening quantity N according to the query result; Wherein, the preset relationship table is established according to the corresponding relationship between different difference values and different opening quantities.

10. The method according to claim 7, characterized in that, After the central controller determines whether the first temperature is greater than the preset upper temperature limit, the method further includes: If not, the central controller uses the first temperature detection element located behind the current temperature detection element in the transportation direction as the target temperature detection element, and obtains a new first temperature.

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