A control system for the rapid cooling section of a tunnel kiln

Abstract

The present invention discloses a control system for a rapid cooling section of a tunnel kiln, the control system comprising a control unit and a mode selection unit, a fan unit and a cold air valve unit electrically connected to the control unit respectively, the mode selection unit controlling the start or stop operation of the cold air valve unit; the cold air valve unit comprising a first cold air valve group, the first cold air valve group comprising a first cold air valve portion controlling the air outlet state of a first air outlet and a second cold air valve portion controlling the air outlet state of a second air outlet; the control unit receives a signal fed back by the mode selection unit, and controls the operation of the fan unit and adjusts the working states of the mode selection unit and the first cold air valve group; the control system for the rapid cooling section of the tunnel kiln disclosed in the present invention can solve the problem of large temperature difference in the rapid cooling section of the existing tunnel kiln by controlling the operation of the first cold air valve portion and the second cold air valve portion so that the air volume output from the first air outlet is inconsistent with the air volume output from the second air outlet.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel kilns, and in particular to a control system for a rapid cooling section of a tunnel kiln. Background Art

[0002] The existing control method for the rapid cooling section of a tunnel kiln is analog control. By collecting the temperature of a single point inside the kiln body to control the frequency of the rapid cooling fan, the air intake of the rapid cooling section of the tunnel kiln is controlled, so that the temperature of the rapid cooling section of the tunnel kiln meets the process requirements. However, for tunnel kilns with a multi-layer structure, when firing large products or special products, the air volume entering the rapid cooling section of the tunnel kiln is single and unchanged. There are cooling temperature differences between each layer and each position. As a result, the fired products may have defects such as product explosion and a low yield rate.

[0003] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the Invention

[0004] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a control system for the rapid cooling section of a tunnel kiln to solve the problems of large temperature difference in the rapid cooling section of the existing tunnel kiln and low yield of fired products.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A control system for a rapid cooling section of a tunnel kiln, the rapid cooling section of the tunnel kiln comprising a kiln body, a left inner wall of the kiln body being provided with a plurality of groups of first air outlets, and a right inner wall of the kiln body being provided with a plurality of groups of second air outlets; the control system comprising a control unit and a mode selection unit, a fan unit and a cold air valve unit electrically connected to the control unit, respectively, the mode selection unit controlling the start or stop of the cold air valve unit; the cold air valve unit comprising a first cold air valve group comprising a first cold air valve portion controlling the air outlet state of the first air outlet and a second cold air valve portion controlling the air outlet state of the second air outlet; the control unit receiving a signal fed back by the mode selection unit, and controlling the operation of the fan unit and adjusting the working states of the mode selection unit and the first cold air valve group.

[0007] In the control system of the rapid cooling section of the tunnel kiln, the mode selection unit includes a first manual switch SA1, and the first manual switch SA1 feeds back the working mode selected by the user to the control unit.

[0008] In the control system of the tunnel kiln rapid cooling section, the mode selection unit includes a second intermediate relay KA2 and a second AC contactor KM2. The second intermediate relay KA2 is connected to the control unit and the second AC contactor KM2 respectively. The second AC contactor KM2 is connected to the first cold air valve group.

[0009] In the control system of the rapid cooling section of the tunnel kiln, the first cold air valve group also includes a first fuse box, the first cold air valve section includes a first pulsating valve and a third pulsating valve, the second cold air valve section includes a sixth pulsating valve and an eighth pulsating valve, the first pulsating valve, the third pulsating valve, the sixth pulsating valve and the eighth pulsating valve are respectively connected to the first fuse box, and the second AC contactor KM2 is connected to the first fuse box; the control unit controls the opening of the first pulsating valve, the third pulsating valve, the sixth pulsating valve and the eighth pulsating valve respectively.

[0010] In the control system of the rapid cooling section of the tunnel kiln, the cold air valve unit also includes a second cold air valve group, which includes a third cold air valve part that controls the air outlet state of the first air outlet and a fourth cold air valve part that controls the air outlet state of the second air outlet.

[0011] In the control system of the tunnel kiln rapid cooling section, the mode selection unit also includes a third AC contactor KM3, the second intermediate relay KA2 is connected to the control unit and the third AC contactor KM3 respectively, and the third AC contactor KM3 is connected to the second cold air valve group.

[0012] In the control system of the rapid cooling section of the tunnel kiln, the second cold air valve group includes a second fuse box, the third cold air valve section includes a second pulsating valve and a fourth pulsating valve, the fourth cold air valve section includes a fifth pulsating valve and a seventh pulsating valve, the second pulsating valve, the fourth pulsating valve, the fifth pulsating valve and the seventh pulsating valve are respectively connected to the second fuse box, and the third AC contactor KM3 is connected to the second fuse box; the control unit controls the opening of the second pulsating valve, the fourth pulsating valve, the fifth pulsating valve and the seventh pulsating valve respectively.

[0013] In the control system of the rapid cooling section of the tunnel kiln, the mode selection unit further includes a first time relay KT1, and the first time relay KT1 is connected to the second AC contactor KM2 and the third AC contactor KM3 respectively.

[0014] In the control system of the rapid cooling section of the tunnel kiln, the mode selection unit also includes a first intermediate relay KA1 and a first AC contactor KM1. The first intermediate relay KA1 is connected to the control unit and the first AC contactor KM1 respectively. The first AC contactor KM1 is also connected to the first cold air group and the second cold air valve group respectively.

[0015] Beneficial effects:

[0016] The present invention provides a control system for a rapid cooling section of a tunnel kiln. The control unit controls the working states of a first cold air valve unit and a second cold air valve unit according to information fed back by a module selection unit, thereby making the air volume output from the first air outlet greater than or less than the air volume output from the second air outlet. High-pressure cold air and low-pressure cold air exist simultaneously in the kiln body of the rapid cooling section of the tunnel kiln, that is, there is a high-low pressure difference in the kiln body, which can improve the air flow effect in the kiln body, thereby reducing the temperature difference in the kiln body, avoiding defects such as product explosion in the fired products, and improving the yield rate of the fired products. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A system structure diagram of the control system provided by the present invention;

[0018] Figure 2 A system structure diagram of the cold air valve unit provided by the present invention;

[0019] Figure 3 A circuit structure diagram of the mode selection unit provided by the present invention;

[0020] Figure 4 A circuit diagram of the cold air valve unit provided by the present invention;

[0021] Figure 5 A circuit diagram of the fan unit provided by the present invention;

[0022] Figure 6 A side structural diagram of the rapid cooling section of the tunnel kiln provided by the present invention;

[0023] Figure 7 This is a top view of the rapid cooling section of the tunnel kiln provided by the present invention.

[0024] Explanation of main component symbols: 1-first fuse box, 2-second fuse box, 3-frequency converter, 4-kiln body, 5-first air outlet, M1-first quenching fan, M2-second quenching fan, J1-first pulsating valve, J2-second pulsating valve, J3-third pulsating valve, J4-fourth pulsating valve, J5-fifth pulsating valve, J6-sixth pulsating valve, J7-seventh pulsating valve, J8-eighth pulsating valve. DETAILED DESCRIPTION

[0025] The present invention provides a control system for a rapid cooling section of a tunnel kiln. To make the purpose, technical solution and effects of the present invention clearer and more specific, the present invention is further described in detail below with reference to the accompanying drawings and examples.

[0026] In the description of the present invention, it should be understood that the terms "upper" and "lower" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and should not be understood as limiting the present invention. In addition, the terms "connection" and the like should be understood in a broad sense, and those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific circumstances.

[0027] The control system of the tunnel kiln rapid cooling section disclosed in this application can be used to control Figure 6 and Figure 7 The operation of the rapid cooling section of the tunnel kiln shown in the figure; the rapid cooling section of the tunnel kiln includes a kiln body 4, and the left inner wall of the kiln body 4 is provided with multiple groups of first air outlets 5, and the right inner wall of the kiln body 4 is provided with multiple groups of second air outlets, the first air outlets 5 and the second air outlets are respectively connected to the rapid cooling fan through pipelines, and the pulsating valve is arranged on the connecting pipeline between the first air outlet and the rapid cooling fan and on the connecting pipeline between the second air outlet and the rapid cooling fan.

[0028] See also Figures 1 to 5 The present application discloses a control system for a rapid cooling section of a tunnel kiln, the control system comprising a control unit and a mode selection unit, a fan unit and a cold air valve unit electrically connected to the control unit respectively, the mode selection unit controls the start or stop operation of the cold air valve unit; the cold air valve unit comprises a first cold air valve group, the first cold air valve group comprises a first cold air valve portion that controls the air outlet state of the first air outlet and a second cold air valve portion that controls the air outlet state of the second air outlet; the control unit receives the signal fed back by the mode selection unit, and controls the operation of the fan unit and adjusts the working states of the mode selection unit and the first cold air valve group; the control unit may be a PLC controller.

[0029] The mode selection unit feeds back the working mode of the tunnel kiln rapid cooling section selected by the user to the control unit. The control unit controls the operation of the fan unit according to the information fed back by the module selection unit, and adjusts the working state of the mode selection unit to start the first cold air valve group to work; then, the control unit adjusts the working states of the first cold air valve unit and the second cold air valve unit to make the air volume output from the first air outlet greater than or less than the air volume output from the second air outlet. High-pressure cold air and low-pressure cold air exist in the kiln body 4 of the tunnel kiln rapid cooling section at the same time, that is, there is a high and low pressure difference in the kiln body 4, which can improve the air flow effect in the kiln body 4, thereby reducing the temperature difference in the kiln body 4, avoiding defects such as product explosion in the fired products, and improving the yield rate of the fired products.

[0030] Further, see Figure 3The mode selection unit includes a first manual switch SA1. By pressing the first manual switch SA1, the user feeds back the working mode of the tunnel kiln rapid cooling section to be selected to the control unit. The control unit can confirm the working mode selected by the user according to the number of times the user presses the first manual switch SA1. In one embodiment, when the user presses the first manual switch SA1 for the first time, it indicates that the user selects the continuous cooling mode, and the first air outlet and the second air outlet simultaneously output strong air to achieve cooling and temperature reduction; when the user presses the first manual switch SA1 for the second time, it indicates that the user selects the pulsating cooling mode, and the air volume output by the first air outlet is greater than or less than the air volume output by the second air outlet, so that high-pressure cold air and low-pressure cold air exist in the kiln body 4 at the same time, thereby improving the air flow effect in the kiln body 4 and achieving pulsating cooling and temperature reduction; when the user presses the first manual switch SA1 for the third time, the tunnel kiln rapid cooling section stops the cooling task, and the first air outlet and the second air outlet stop outputting cooling air; when the user presses the first manual switch SA1 for the fourth time, it indicates that the user selects the continuous cooling mode, and when the user presses the first manual switch SA1 for the fifth time, it indicates that the user selects the pulsating cooling mode, and so on.

[0031] Further, see Figure 3 and Figure 4 The mode selection unit includes a second intermediate relay KA2 and a second AC contactor KM2. The second intermediate relay KA2 is connected to the control unit and the second AC contactor KM2 respectively. The second AC contactor KM2 is connected to the first cold air valve group. When the user selects the pulsating cooling mode, the control unit controls the second intermediate relay KA2 and the second AC contactor KM2 to be energized, and the first cold air valve group starts working.

[0032] Further, see Figure 3 and Figure 4 The first cold air valve group also includes a first fuse box 1, the first cold air valve part includes a first pulsating valve J1 and a third pulsating valve J3, the second cold air valve part includes a sixth pulsating valve J6 and an eighth pulsating valve J8, the first pulsating valve J1, the third pulsating valve J3, the sixth pulsating valve J6 and the eighth pulsating valve J8 are respectively connected to the first fuse box 1, and the second AC contactor KM2 is connected to the first fuse box 1; the control unit controls the opening of the first pulsating valve J1, the third pulsating valve J3, the sixth pulsating valve J6 and the eighth pulsating valve J8 respectively.

[0033] In one embodiment, see Figure 4 The first fuse box 1 includes a plurality of fusible switches, and each pulsating valve is connected to two fusible switches respectively.

[0034] In one embodiment, the left inner wall of the kiln body 4 of the rapid cooling section of the tunnel kiln is provided with two groups of first air outlets from top to bottom, and the right inner wall of the kiln body 4 is provided with two groups of second air outlets from top to bottom. The two groups of first air outlets and the two groups of second air outlets are arranged at intervals, that is, one group of second air outlets is located between the two groups of first air outlets, and the other group of second air outlets is located below the first air outlets arranged below the left inner wall; when the second AC contactor KM2 is energized, the first fuse box 1 is energized, and the first pulsating valve J1, the third pulsating valve J3, and the sixth pulsating valve J 6 and the eighth pulsating valve J8 are simultaneously energized, and the fan unit outputs cooling air to the first air outlet and the second air outlet; the control unit controls and adjusts the opening of the first pulsating valve J1, the third pulsating valve J3, the sixth pulsating valve J6 and the eighth pulsating valve J8, so that the air volume output from the first air outlet and the second air outlet is inconsistent. For example, the first pulsating valve J1 and the third pulsating valve J3 are opened at 100%, and the sixth pulsating valve J6 and the eighth pulsating valve J8 are opened at 10%, so that high-pressure cold air and low-pressure cold air exist in the kiln body 4 at the same time, thereby improving the air flow effect in the kiln body 4.

[0035] In addition, in one embodiment, the control unit may include a timing module, and an alternation time is pre-set in the control unit, and the alternation time can be one minute to three minutes; when the alternation time is reached, the control unit exchanges the air outlet status of the first air outlet and the second air outlet, for example, the first air outlet changes from large air volume output to small air volume output, and the second air outlet changes from small air volume output to large air volume output; the left inner wall and the right inner wall continuously alternate between large air volume output and small air volume output, so that the pressure of each local area in the kiln body 4 changes frequently, generating strong turbulent stirring back and forth, eliminating the dead zone problem caused by static cooling, that is, eliminating the problem of local excessive temperature, further reducing the temperature difference in the kiln body 4, and improving product quality; in addition, the air fluidity in the kiln body 4 is strong, which can speed up the cooling task, that is, shorten the cycle required for product firing, and improve production efficiency.

[0036] Further, see Figure 2 The cold air valve unit also includes a second cold air valve group, which includes a third cold air valve portion that controls the air outlet state of the first air outlet and a fourth cold air valve portion that controls the air outlet state of the second air outlet.

[0037] For a tunnel kiln with three loading layers, since the kiln body 4 is relatively high and has a relatively large overall volume, and more products need to be fired, in order to further reduce the horizontal and vertical temperature differences in the rapid cooling section of the tunnel kiln, in one embodiment, refer to Figure 6 and Figure 7The left inner wall of the kiln body 4 is provided with four groups of first air outlets 5 in sequence from top to bottom, and the right inner wall of the kiln body 4 is provided with four groups of second air outlets in sequence from top to bottom. One group of first air outlets 5 corresponds to one group of second air outlets, that is, one group of first air outlets 5 and one group of second air outlets are located at the same height.

[0038] Further, see Figure 3 and Figure 4 The mode selection unit also includes a third AC contactor KM3, the second intermediate relay KA2 is connected to the control unit and the third AC contactor KM3 respectively, and the third AC contactor KM3 is connected to the second cold air valve group; when the user selects the pulsating cooling mode, the control unit controls the second intermediate relay KA2 to be energized, and the control unit then controls the second AC contactor KM2 and the third AC contactor KM3 to be energized in turn according to a preset alternation time, so that the first cold air valve group and the second cold air valve group work in turn; the cooling air can fully flow in various areas of the kiln body 4, further reducing the temperature difference in the rapid cooling section of the tunnel kiln.

[0039] Further, see Figure 3 and Figure 4 The second cold air valve group includes a second fuse box 2, the third cold air valve section includes a second pulsating valve J2 and a fourth pulsating valve J4, the fourth cold air valve section includes a fifth pulsating valve J5 and a seventh pulsating valve J7, the second pulsating valve J2, the fourth pulsating valve J4, the fifth pulsating valve J5 and the seventh pulsating valve J7 are respectively connected to the second fuse box 2, and the third AC contactor KM3 is connected to the second fuse box 2; the control unit controls the opening of the second pulsating valve J2, the fourth pulsating valve J4, the fifth pulsating valve J5 and the seventh pulsating valve J7 respectively.

[0040] In one embodiment, see Figure 4 The second fuse box 2 includes a plurality of fusible switches, and each pulsating valve is connected to two fusible switches respectively.

[0041] When the working time of the first cold air valve group is equal to the replacement time, the second AC contactor KM2 is disconnected, the third AC contactor KM3 is energized, and the second cold air valve group starts to work; the second fuse box 2 is energized, the second pulsating valve J2, the fourth pulsating valve J4, the fifth pulsating valve J5 and the seventh pulsating valve J7 are energized at the same time, and the fan unit outputs cooling air to the first air outlet 5 and the second air outlet; the control unit controls and adjusts the opening of the second pulsating valve J2, the fourth pulsating valve J4, the fifth pulsating valve J5 and the seventh pulsating valve J7, so that the air volume output from the first air outlet 5 and the second air outlet is inconsistent. For example, the second pulsating valve J2 and the fourth pulsating valve J4 are opened at 10%, and the fifth pulsating valve J5 and the seventh pulsating valve J7 are opened at 100%, so that high-pressure cold air and low-pressure cold air exist in the kiln body 4 at the same time, thereby improving the air flow effect in the kiln body 4.

[0042] In one embodiment, the control unit may control the first cold air valve group and the second cold air valve group to alternate in the following four stages, that is, when the running time of each stage is equal to the alternation time, the control unit controls the first cold air valve group and the second cold air valve group to execute the next stage; the four stages are specifically:

[0043] Phase 1: The control device controls the opening of the first pulsating valve J1 and the third pulsating valve J3 to 100%, and controls the opening of the sixth pulsating valve J6 and the eighth pulsating valve J8 to 10%;

[0044] Phase 2: The control device controls the opening of the second pulsating valve J2 and the fourth pulsating valve J4 to 10%, and controls the opening of the fifth pulsating valve J5 and the seventh pulsating valve J7 to 100%;

[0045] Stage 3: The control device controls the opening of the first pulsating valve J1 and the third pulsating valve J3 to 10%, and controls the opening of the sixth pulsating valve J6 and the eighth pulsating valve J8 to 100%;

[0046] Stage 4: The control device controls the opening of the second pulsating valve J2 and the fourth pulsating valve J4 to 100%, and controls the opening of the fifth pulsating valve J5 and the seventh pulsating valve J7 to 10%.

[0047] The air outlets on the left and right sides of the inner wall of the kiln body 4 respectively output a large air volume and a small air volume, and the air outlet states of the left and right air outlets are changed in turn, so that strong turbulence is generated inside the kiln body 4 and stirred back and forth, which further improves the air flow effect and reduces the temperature difference in the kiln body 4, thereby improving the quality of the fired products; in addition, the first cold air valve group and the second cold air valve group are set. For larger tunnel kilns, it can ensure that the cooling air flows fully in various areas of the kiln body 4, shortening the execution time required for the cooling task and improving production efficiency.

[0048] Further, see 3 and Figure 4 The mode selection unit also includes a first time relay KT1, which is connected to the second AC contactor KM2 and the third AC contactor KM3 respectively; when the first time relay KT1 is energized, the first cold air valve group works and the second cold air valve group does not work; when the first time relay KT1 is disconnected, the first cold air valve group does not work and the second cold air valve group works, thereby realizing the alternating operation of the first cold air valve group and the second cold air valve group.

[0049] Further, see Figure 3 and Figure 4 The mode selection unit also includes a first intermediate relay KA1 and a first AC contactor KM1. The first intermediate relay KA1 is connected to the control unit and the first AC contactor KM1 respectively. The first AC contactor KM1 is also connected to the first cold air group and the second cold air valve group respectively. When the user selects the continuous cooling mode, the first intermediate relay KA1 and the first AC contactor KM1 are energized, the first cold air valve group and the second cold air valve group work simultaneously, and the first air outlet and the second air outlet simultaneously deliver a large amount of cooling air into the kiln body 4 to achieve product cooling.

[0050] Further, see Figure 5 The fan unit includes a first quenching fan M1 and a frequency converter 3, a first circuit breaker QF1, a fourth AC contactor KM4 and a fifth AC contactor KM5 which are electrically connected to the control unit respectively. The first circuit breaker QF1 is connected to the frequency converter 3, the fourth AC contactor KM4 is connected to the frequency converter 3, and the fifth AC contactor KM5 is connected to the fourth AC contactor KM4 and the first quenching fan M1 respectively; when the user selects continuous cooling mode or pulsating cooling mode, the first circuit breaker QF1, the fourth AC frequency converter 3KM4 and the fifth AC frequency converter 3KM5 are closed, and the first quenching fan M1 starts working to output cooling air to the first air outlet 5 and the second air outlet.

[0051] In one embodiment, the model of the inverter 3 is MD290T22G / 30P, and the control unit includes a PID calculation module. The PID calculation module calculates the output frequency required by the quenching fan based on the temperature feedback from the temperature sensor set in the quenching section. The control unit controls the operating frequency of the first fan by controlling the operation of the inverter 3.

[0052] Further, see Figure 5The fan unit also includes a second quenching fan M2 and a sixth AC contactor KM6. The sixth AC contactor KM6 is connected to the fourth AC contactor KM4 and the second quenching fan M2 respectively. When the first quenching fan M1 needs maintenance or fails, the control unit controls the fifth AC contactor KM5 to disconnect and the sixth AC contactor KM6 to close, and the second quenching fan M2 starts working. Setting the second quenching fan M2 as a backup fan can ensure the normal and orderly firing of the tunnel kiln.

[0053] Experiments have shown that when the control system of the tunnel kiln quenching section disclosed in this application is used to control the operation of the tunnel kiln quenching section, the temperature difference in the quenching section is measured to be 5 degrees Celsius, and the defect rate of the product fired is only 2.5%. In contrast, the temperature difference of the traditional tunnel kiln can reach 15 degrees Celsius, and the defect rate of the product fired is 5.3%. That is, when the control system disclosed in this application is used to control the operation of the tunnel kiln quenching section, the temperature difference in the tunnel kiln quenching section can be greatly reduced, the product yield can be improved, and thus the economic losses in the production process can be reduced.

[0054] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all such changes or substitutions should fall within the scope of protection of the present invention.

Claims

1. A control system for a rapid cooling section of a tunnel kiln, the rapid cooling section of the tunnel kiln comprising a kiln body, wherein the left inner wall of the kiln body is provided with a plurality of first air outlets, and the right inner wall of the kiln body is provided with a plurality of second air outlets, characterized in that: The control system includes a control unit and a mode selection unit, a fan unit and a cold air valve unit electrically connected to the control unit respectively, the mode selection unit controls the start or stop of the cold air valve unit; the cold air valve unit includes a first cold air valve group, the first cold air valve group includes a first cold air valve part that controls the air discharge state of the first air outlet and a second cold air valve part that controls the air discharge state of the second air outlet; the control unit receives a signal fed back by the mode selection unit, and controls the operation of the fan unit and adjusts the working states of the mode selection unit and the first cold air valve group; The first cold air valve unit includes a first pulsating valve and a third pulsating valve, and the second cold air valve unit includes a sixth pulsating valve and an eighth pulsating valve; the control unit controls the openings of the first pulsating valve, the third pulsating valve, the sixth pulsating valve, and the eighth pulsating valve, respectively, so that the air volumes output from the first air outlet and the second air outlet are inconsistent; The cold air valve unit further includes a second cold air valve group, which includes a third cold air valve portion for controlling the air discharge state of the first air outlet and a fourth cold air valve portion for controlling the air discharge state of the second air outlet; The third cold air valve unit includes a second pulsating valve and a fourth pulsating valve, and the fourth cold air valve unit includes a fifth pulsating valve and a seventh pulsating valve; the control unit controls the openings of the second pulsating valve, the fourth pulsating valve, the fifth pulsating valve, and the seventh pulsating valve, respectively, so that the air volumes output from the first air outlet and the second air outlet are inconsistent; The control unit includes a timing module. When the preset alternation time is reached, the control unit exchanges the air outlet states of the first air outlet and the second air outlet, so that the left inner wall and the right inner wall continuously alternate between high air volume output and low air volume output.

2. The control system for the rapid cooling section of a tunnel kiln according to claim 1, characterized in that: The mode selection unit includes a first manual switch SA1, which feeds back the working mode selected by the user to the control unit.

3. The control system for the rapid cooling section of a tunnel kiln according to claim 1, characterized in that: The mode selection unit includes a second intermediate relay KA2 and a second AC contactor KM2. The second intermediate relay KA2 is connected to the control unit and the second AC contactor KM2 respectively. The second AC contactor KM2 is connected to the first cold air valve group.

4. The control system for the rapid cooling section of a tunnel kiln according to claim 3, characterized in that: The first cold air valve group also includes a first fuse box, the first pulsating valve, the third pulsating valve, the sixth pulsating valve and the eighth pulsating valve are respectively connected to the first fuse box, and the second AC contactor KM2 is connected to the first fuse box.

5. The control system for the rapid cooling section of a tunnel kiln according to claim 4, characterized in that: The mode selection unit further includes a third AC contactor KM3 , the second intermediate relay KA2 is connected to the control unit and the third AC contactor KM3 respectively, and the third AC contactor KM3 is connected to the second cold air valve group.

6. The control system for the rapid cooling section of a tunnel kiln according to claim 5, characterized in that: The second cold air valve group includes a second fuse box, the second pulsating valve, the fourth pulsating valve, the fifth pulsating valve and the seventh pulsating valve are respectively connected to the second fuse box, and the third AC contactor KM3 is connected to the second fuse box.

7. The control system for the rapid cooling section of a tunnel kiln according to claim 6, characterized in that: The mode selection unit further includes a first time relay KT1 , which is connected to the second AC contactor KM2 and the third AC contactor KM3 .

8. The control system for the rapid cooling section of a tunnel kiln according to claim 4, characterized in that: The mode selection unit further includes a first intermediate relay KA1 and a first AC contactor KM1. The first intermediate relay KA1 is connected to the control unit and the first AC contactor KM1 respectively. The first AC contactor KM1 is also connected to the first cold air group and the second cold air valve group respectively.

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