A mixing device for the mixed rubber used in tire production

Abstract

The present invention provides a mixing device for the mixing rubber used in tire production, which relates to the technical field of tire rubber products and includes: calculating the required addition speed of each raw material according to the mixing rubber formula and the target production rate; putting the high-molecular rubber and carbon black into the mixing device for premixing based on the first mixing temperature and the first mixing time to obtain a first mixture; adding a plasticizer, an antioxidant, and a vulcanizing agent to the first mixture and performing main mixing based on the second mixing temperature and the second mixing time to obtain a second mixture; performing high-temperature mixing based on the third mixing temperature and the third mixing time, and discharging the material after the high-temperature mixing is completed to obtain a rubber compound; cooling the rubber compound by a spray cooling method. During the mixing process, precise temperature control is adopted to avoid premature occurrence of rubber degradation or cross-linking reactions. The mixing time of each stage is controlled by the system to ensure the best combination point between different materials, further improving the quality of the colloid.

Description

Technical Field

[0001] The present invention relates to the technical field of tire rubber products, and particularly to a mixing device for the mixing rubber used in tire production. Background Art

[0002] In tire production, the mixing rubber is a semi-finished product obtained by mixing rubber with various additives, fillers, vulcanizing agents, etc. The quality of the mixing rubber directly affects the performance of the tire (such as wear resistance, heat resistance, anti-aging property, etc.). The current mixing process generally includes steps such as preliminary mixing, main mixing, and adding vulcanizing agents and modifiers. However, the traditional mixing process still has problems such as uneven mixing, inaccurate temperature control, and energy waste. Summary of the Invention

[0003] The present invention provides a mixing device for the mixing rubber used in tire production to solve the defects of uneven mixing, inaccurate temperature control, and energy waste existing in the traditional mixing process in the prior art.

[0004] On the one hand, the present invention provides a mixing process for the mixing rubber used in tire production, including:

[0005] Step 1: Calculate the required addition amount of each raw material according to the mixing rubber formula and the target production rate;

[0006] Step 2: Put the high molecular rubber and carbon black into the mixing device for premixing based on the first mixing temperature and the first mixing time to obtain a first mixture;

[0007] Step 3: Add a plasticizer, an antioxidant, and a vulcanizing agent to the first mixture, and perform main mixing based on the second mixing temperature and the second mixing time to obtain a second mixture;

[0008] Step 4: Perform high-temperature mixing based on the third mixing temperature and the third mixing time. After the high-temperature mixing is completed, discharge the material to obtain the rubber compound;

[0009] Step 5: Cool down the rubber compound by spray cooling.

[0010] Preferably, the first mixing temperature in Step 2 is 100 - 105 °C, and the first mixing time is 7 - 8 minutes.

[0011] Preferably, the second mixing temperature in Step 3 is 140 - 145 °C, and the second mixing time is 12 - 13 minutes.

[0012] Preferably, the third mixing temperature in Step 4 is 150 - 170 °C, and the third mixing time is 6 - 7 minutes.

[0013] On the other hand, the present invention also provides a kneading device for the kneaded rubber used in tire production, which includes a supporting bottom plate. An installation bracket, a cooling box, a water storage tank and a temperature control box are fixedly connected to the upper surface of the supporting bottom plate. A kneading tank is fixedly installed on the installation bracket. The cooling box is arranged below the kneading tank. A feed inlet is arranged on the kneading tank. A kneading assembly is arranged in the kneading tank. The kneading tank is communicated with the temperature control box through two gas transmission pipes. A driving motor is fixedly installed on the top surface of the installation bracket. The driving motor is used to drive the kneading assembly. The discharge port of the kneading tank is communicated with the inner cavity of the cooling box. The water storage tank is communicated with the cooling box through a water transmission pipe.

[0014] Preferably, the kneading assembly includes a driving shaft, which is fixedly connected to the output end of the driving motor, and a plurality of stirring blades are fixedly connected to the circumferential direction of the driving shaft.

[0015] Preferably, a temperature control module is arranged in the temperature control box, and the temperature control module includes:

[0016] An air circulation pipeline, which is used to realize the circulation of the air in the test chamber;

[0017] A plurality of temperature sensors, which are evenly arranged in the air circulation pipeline and are used to detect the gas temperature in the air circulation pipeline;

[0018] A refrigeration element, which is arranged inside the air circulation pipeline and is used to cool the air in the air circulation pipeline;

[0019] A heating element, which is arranged inside the air circulation pipeline and is used to heat the air in the air circulation pipeline.

[0020] Preferably, a cooling and temperature-reducing assembly is provided inside the cooling box. The cooling and temperature-reducing assembly includes a cooling basin. A support frame is fixedly connected to the side wall of the cooling basin. A support pad is fixedly connected to the inner bottom surface of the cooling box below the cooling basin. Two groups of vertically arranged spring rod assemblies are symmetrically arranged on the left and right sides of the support pad. The fixed ends of the spring rod assemblies are fixedly connected to the inner bottom surface of the cooling box, and the movable ends of the spring rod assemblies are fixedly connected to the lower bottom surface of the support frame. Two inclined blocks 1 are symmetrically and fixedly connected to the upper surface of the support frame. An inclined surface 1 is provided on the upper surface of the inclined block 1. The height of the side of the inclined surface 1 close to the cooling basin is greater than the height of the side away from the cooling basin. A spray control assembly is correspondingly arranged above each inclined block 1. The spray control assembly includes a horizontally arranged sliding track, which is fixedly connected to the inner top surface of the cooling box. A sliding groove 1 is provided on the lower bottom surface of the sliding track. A horizontally arranged mounting rod is fixedly connected inside the sliding groove 1. A sliding block that slides in the left-right direction is slidably connected to the mounting rod. A spring 1 is fixedly connected between the sliding block and the inner wall of the sliding groove 1 away from the cooling basin. A connecting plate is fixedly connected to the lower surface of the sliding block. An inclined block 2 is fixedly connected to the lower end of the connecting plate. An inclined surface 2 is provided on the lower surface of the inclined block 2. The inclined surface 1 is in contact with the inclined surface 2. A horizontally arranged spray rack is fixedly connected to the side wall of the connecting plate. A plurality of spray nozzles are installed on the spray rack. The spray nozzles are communicated with the water delivery pipe through a water delivery hose.

[0021] Preferably, ventilation openings are provided on the left and right side walls of the cooling box. A plurality of adjusting fan blades are rotatably connected inside the ventilation openings. A control column is fixedly connected to the side of the adjusting fan blades close to the inner cavity of the cooling box. Two groups of adjusting assemblies are symmetrically arranged inside the cooling box on the left and right. The adjusting assembly includes a mounting seat, which is fixedly connected to the inner bottom surface of the cooling box. A sliding hole is provided on the upper surface of the mounting seat. A control rod that slides in the up-down direction is slidably connected inside the sliding hole. A spring 2 is fixedly connected between the lower bottom surface of the control rod and the inner bottom surface of the sliding hole. The control rod is fixedly connected to the control frame. A plurality of control buckles are fixedly connected to the side wall of the control frame. The control buckles correspond to the adjusting fan blades one by one. A sliding groove 2 is provided inside each control buckle. The control column slides inside the sliding groove 2.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] By adopting a staged mixing method, first, the preliminary mixing raw materials are mixed to form a preliminary dispersion system; then, other auxiliary materials such as cross-linking agents and fillers are added. By precisely controlling the mixing time and temperature, each component is fully dispersed, improving the uniformity of the colloid composition, thereby improving the quality of the colloid. By precisely controlling the mixing time of each stage, the rubber degradation caused by overmixing is avoided. Description of the Drawings

[0024] To more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 is a schematic structural diagram of the kneading device of the present invention;

[0026] Figure 2 is a front view structural schematic diagram of the kneading device of the present invention;

[0027] Figure 3 is a schematic structural diagram of the cooling box of the present invention;

[0028] Figure 4 is Figure 3 an enlarged schematic diagram at position A in

[0029] Figure 5 is Figure 3 an enlarged schematic diagram at position B in

[0030] Reference numerals:

[0031] 1, support base plate; 2, mounting bracket; 3, cooling box; 4, water storage tank; 5, temperature adjustment box; 6, kneading tank; 7, feed inlet; 8, gas transmission pipe; 9, drive motor; 10, discharge port; 11, water transmission pipe; 12, drive shaft; 13, stirring blade; 14, cooling basin; 15, support frame; 16, support pad; 17, spring rod assembly; 171, rod seat; 172, mounting hole; 173, rod core; 174, spring three; 18, inclined block one; 19, inclined surface one; 20, sliding track; 21, sliding groove one; 22, mounting rod; 23, sliding block; 24, spring one; 25, connecting plate; 26, inclined block two; 27, inclined surface two; 28, spray rack; 29, spray nozzle; 30, water transmission hose; 31, ventilation port; 32, adjusting fan blade; 33, control column; 34, mounting seat; 35, sliding hole; 36, control rod; 37, control frame; 38, control buckle; 39, sliding groove two; 40, spring two. Detailed implementation manners

[0032] To make the objectives, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention in conjunction with the drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present invention belong to the scope protected by the present invention.

[0033] In addition, in the present invention, descriptions such as "first" and "second" are for descriptive purposes only, and do not particularly refer to the order or sequence. Nor are they used to limit the present invention. They are merely used to distinguish components or operations described with the same technical terms, and should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions and technical features between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] Embodiment 1

[0035] The embodiment of the present invention provides a mixing process for the mixing rubber used in tire production, including:

[0036] Step 1: Calculate the required addition amount of each raw material according to the mixing rubber formula and the target production rate;

[0037] Step 2: Put the high molecular rubber and carbon black into a mixing device and perform pre-mixing based on the first mixing temperature and the first mixing time to obtain a first mixture;

[0038] Step 3: Add a plasticizer, an antioxidant, and a vulcanizing agent to the first mixture, and perform main mixing based on the second mixing temperature and the second mixing time to obtain a second mixture;

[0039] Step 4: Perform high-temperature mixing based on the third mixing temperature and the third mixing time. After the high-temperature mixing is completed, discharge the material to obtain the rubber compound;

[0040] Step 5: Cool down the rubber compound by spray cooling.

[0041] Preferably, the first mixing temperature in Step 2 is 100 - 105 °C, and the first mixing time is 7 - 8 minutes.

[0042] Preferably, the second mixing temperature in Step 3 is 140 - 145 °C, and the second mixing time is 12 - 13 minutes.

[0043] Preferably, the third mixing temperature in Step 4 is 150 - 170 °C, and the third mixing time is 6 - 7 minutes.

[0044] The beneficial effects of the above technical solutions are:

[0045] Adopt a staged mixing method. First, mix the initial mixed raw materials to form a preliminary dispersion system. Subsequently, add other auxiliary materials such as cross-linking agents and fillers, and through precise control of the mixing time and temperature, make each component fully dispersed, improve the uniformity of the colloid composition, thereby improving the quality of the colloid. By precisely controlling the mixing time of each stage, rubber degradation caused by overmixing is avoided.

[0046] Precise temperature control is adopted during the mixing process. Through reasonable temperature control, premature rubber degradation or cross-linking reactions are avoided. The mixing time of each stage is controlled by the system to ensure the best combination point between different materials, further improving the quality of the colloid.

[0047] Example 2

[0048] The embodiment of the present invention also provides a mixing device for the mixing rubber used in tire production, which is applied to the mixing process of the mixing rubber used in tire production as described in Example 1. It includes a support bottom plate 1. On the upper surface of the support bottom plate 1, there are fixedly connected an installation bracket 2, a cooling box 3, a water storage tank 4, and a temperature adjustment box 5. A mixing tank 6 is fixedly installed on the installation bracket 2. The cooling box 3 is arranged below the mixing tank 6. There is a feed port 7 on the mixing tank 6. A mixing component is arranged inside the mixing tank 6. The mixing tank 6 is connected to the temperature adjustment box 5 through two air pipes 8. On the top surface of the installation bracket 2, a driving motor 9 is fixedly installed. The driving motor 9 is used to drive the mixing component. The discharge port 10 of the mixing tank 6 is communicated with the inner cavity of the cooling box 3. The water storage tank 4 is communicated with the cooling box 3 through a water pipe 11.

[0049] Preferably, the mixing component includes a driving shaft 12. The driving shaft 12 is fixedly connected to the output end of the driving motor 9. A number of stirring blades 13 are fixedly connected circumferentially to the driving shaft 12.

[0050] Preferably, a temperature control module is arranged inside the temperature adjustment box 5. The temperature control module includes:

[0051] An air circulation pipeline for realizing the circulation of the air inside the test chamber;

[0052] A number of temperature sensors are evenly arranged inside the air circulation pipeline for detecting the gas temperature inside the air circulation pipeline;

[0053] A refrigeration element is arranged inside the air circulation pipeline for cooling the air inside the air circulation pipeline;

[0054] A heating element is arranged inside the air circulation pipeline for heating the air inside the air circulation pipeline.

[0055] Preferably, a cooling and temperature-lowering assembly is provided in the cooling box 3. The cooling and temperature-lowering assembly includes a cooling basin 14. A support frame 15 is fixedly connected to the side wall of the cooling basin 14. A support pad 16 is fixedly connected to the inner bottom surface of the cooling box 3 below the cooling basin 14. Two groups of vertically arranged spring rod assemblies 17 are symmetrically arranged on the left and right sides of the support pad 16. The fixed end of the spring rod assembly 17 is fixedly connected to the inner bottom surface of the cooling box 3, and the movable end of the spring rod assembly 17 is fixedly connected to the lower bottom surface of the support frame 15. Two inclined blocks 18 are symmetrically and fixedly connected to the upper surface of the support frame 15. An inclined surface 19 is provided on the upper surface of the inclined block 18. The height of the side of the inclined surface 19 close to the cooling basin 14 is greater than the height of the side far from the cooling basin 14. A spray control assembly is correspondingly arranged above each inclined block 18. The spray control assembly includes a horizontally arranged sliding track 20. The sliding track 20 is fixedly connected to the inner top surface of the cooling box 3. A sliding groove 21 is provided on the lower bottom surface of the sliding track 20. A horizontally arranged mounting rod 22 is fixedly connected in the sliding groove 21. A sliding block 23 that slides in the left-right direction is slidably connected to the mounting rod 22. A spring 24 is fixedly connected between the sliding block 23 and the inner wall of the sliding groove 21 far from the cooling basin 14. A connecting plate 25 is fixedly connected to the lower surface of the sliding block 23. An inclined block 26 is fixedly connected to the lower end of the connecting plate 25. An inclined surface 27 is provided on the lower surface of the inclined block 26. The inclined surface 19 is in contact with the inclined surface 27. A horizontally arranged spray rack 28 is fixedly connected to the side wall of the connecting plate 25. A plurality of spray nozzles 29 are installed on the spray rack 28. The spray nozzles 29 are communicated with the water delivery pipe 11 through a water delivery hose 30.

[0056] Preferably, ventilation openings 31 are provided on the left and right side walls of the cooling box 3. A plurality of adjusting fan blades 32 are rotatably connected in the ventilation openings 31. A control column 33 is fixedly connected to the side of the adjusting fan blade 32 close to the inner cavity of the cooling box 3. Two groups of adjusting assemblies are symmetrically arranged in the cooling box 3. The adjusting assembly includes a mounting seat 34. The mounting seat 34 is fixedly connected to the inner bottom surface of the cooling box 3. A sliding hole 35 is provided on the upper surface of the mounting seat 34. A control rod 36 is slidably connected in the sliding hole 35 in the up-down direction. A spring 40 is fixedly connected between the lower bottom surface of the control rod 36 and the inner bottom surface of the sliding hole 35. The control rod 36 is fixedly connected to a control frame 37. A plurality of control buckles 38 are fixedly connected to the side wall of the control frame 37. The control buckles 38 correspond to the adjusting fan blades 32 one by one. A sliding groove 39 is provided in each control buckle 38. The control column 33 slides in the sliding groove 39.

[0057] In this embodiment, the spring rod assembly 17 includes a rod seat 171. The rod seat 171 is fixedly connected to the inner bottom surface of the cooling box 3. A mounting hole 172 is provided in the rod seat 171. A rod core 173 is slidably connected in the mounting hole 172 in the up-down direction. A spring 174 is fixedly connected between the rod core 173 and the inner wall of the mounting hole 172.

[0058] The beneficial effects of the above technical solutions are as follows;

[0059] When kneading the colloid, the kneading raw materials are put into the kneading tank 6 through the feed port 7, and the drive shaft 12 is rotated by the drive motor 9 to stir the kneading materials, thus completing the kneading. The temperature inside the kneading tank 6 is controlled by circulating the air inside the kneading tank 6, and the temperature inside the kneading tank 6 is controlled by controlling the temperature of the circulated air, which improves the uniformity of the temperature distribution inside the kneading tank 6. By accurately controlling the temperature of the circulated air, the accuracy of temperature control is improved, and thus the quality of the produced colloid is improved.

[0060] After the kneading is completed, the colloid falls into the cooling basin 14 through the discharge port 10. As the mass of the colloid in the cooling basin 14 increases, the spring rod assembly 17 is compressed, so that the cooling basin 14 moves downward, thus pressing down the control frame 37, causing the second spring 40 to be compressed, so that the adjusting fan blade 32 rotates, thus increasing the ventilation volume of the cooling box 3 and improving the heat dissipation effect on the colloid. At the same time, the first slider descends along with the support frame 15, and under the action of the first spring 24, the sliding block 23 moves towards the direction close to the cooling basin 14, so that the spray rack 28 reaches above the cooling basin 14, facilitating spray cooling of the colloid. After the colloid is cooled, the staff opens the cooling box 3 to take out the cooled colloid.

[0061] When the cooling box 3 is not performing the cooling work, the ventilation port 31 is closed by the adjusting fan blade 32 to prevent external dust from entering the inside of the cooling box 3 along the ventilation port 31, ensuring the cleanliness inside the cooling box 3 and preventing dust from adhering to the colloid, resulting in a decline in the quality of the colloid. When performing the cooling work, by opening the adjusting fan blade 32, the ventilation volume inside the cooling box 3 is increased, improving the heat dissipation effect on the colloid, and at the same time increasing the evaporation amount of the spray, further improving the heat dissipation effect on the colloid. When the cooling basin 14 is in the no-load state, the spray rack 28 is not above the cooling basin 14, preventing the colloid from coming into contact with the spray rack 28 during the process of falling into the cooling basin 14, causing damage to the spray rack 28 and loss of the colloid. When enough colloid accumulates in the cooling basin 14, the spray rack 28 automatically reaches above the cooling basin 14, improving the effect of spray cooling. This process does not require additional operations by the staff, is easy to operate, reduces the work intensity of the staff, and through the setting of the support pad 16, it is ensured that the downward travel of the cooling basin 14 will not exceed the predetermined travel, reducing the failure rate of the device.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention 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 described in the foregoing embodiments, or perform equivalent replacements on 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 invention.

Claims

1. A mixing device for rubber compound used in tire production, characterized in that: The invention comprises a supporting base plate (1), the upper surface of which is fixedly connected with a mounting bracket (2), a cooling box (3), a water storage tank (4) and a temperature regulating box (5), a mixing tank (6) is fixedly mounted on the mounting bracket (2), the cooling box (3) is arranged below the mixing tank (6), a material feed port (7) is arranged on the mixing tank (6), a mixing assembly is arranged in the mixing tank (6), the mixing tank (6) and the temperature regulating box (5) are connected via two air pipes (8), a driving motor (9) is fixedly mounted on the upper top surface of the mounting bracket (2), the driving motor (9) is used to drive the mixing assembly, a material discharge port (10) of the mixing tank (6) is connected to the inner cavity of the cooling box (3), and the water storage tank (4) and the cooling box (3) are connected via a water pipe (11); A cooling component is arranged in the cooling box (3), and the cooling component comprises a cooling basin (14), the side wall of the cooling basin (14) is fixedly connected to a support frame (15), a support pad (16) is fixedly connected to the inner bottom surface of the cooling box (3) below the cooling basin (14), two groups of vertically arranged spring rod components (17) are symmetrically arranged on the left and right sides of the support pad (16), the fixed end of the spring rod component (17) is fixedly connected to the inner bottom surface of the cooling box (3), the movable end of the spring rod component (17) is fixedly connected to the lower bottom surface of the support frame (15), two inclined blocks (18) are symmetrically fixedly connected to the upper surface of the support frame (15), the upper surface of the inclined block (18) is provided with an inclined surface (19), the height of the inclined surface (19) on the side close to the cooling basin (14) is greater than the height on the side away from the cooling basin (14), and a group of spray control components is correspondingly arranged above each inclined block (18), and the spray control component comprises a horizontally arranged sliding track (2 0), the sliding track (20) is fixedly connected to the top surface of the cooling box (3), the bottom surface of the sliding track (20) is provided with a sliding groove (21), a mounting rod (22) arranged horizontally is fixedly connected in the sliding groove (21), a sliding block (23) sliding in the left and right directions is slidably connected to the mounting rod (22), a spring (24) is fixedly connected between the sliding block (23) and the inner wall of the sliding groove (21) away from the cooling basin (14), and the sliding block (23) is fixedly connected to the inner wall of the sliding groove (21) away from the cooling basin (14), and the sliding block (23) is fixedly connected to the inner wall of the sliding groove (21) away from the cooling basin (14). ) a lower surface of the connecting plate (25) is fixedly connected, a second inclined block (26) is fixedly connected to the lower end of the connecting plate (25), a second inclined surface (27) is arranged on the lower surface of the second inclined block (26), the first inclined surface (19) is in contact with the second inclined surface (27), a side wall of the connecting plate (25) is fixedly connected to a horizontally arranged spray rack (28), a plurality of spray nozzles (29) are installed on the spray rack (28), and the spray nozzles (29) are connected to the water pipe (11) through a water hose (30); The left and right side walls of the cooling box (3) are provided with ventilation holes (31), a plurality of adjustment blades (32) are rotatably connected in the ventilation holes (31), a control column (33) is fixedly connected to the side of the adjustment blades (32) close to the inner cavity of the cooling box (3), two groups of adjustment components are symmetrically arranged in the cooling box (3), the adjustment components include a mounting seat (34), the mounting seat (34) is fixedly connected to the inner bottom surface of the cooling box (3), and a sliding hole (35) is arranged on the upper surface of the mounting seat (34), and the sliding hole (35) A control rod (36) is slidably connected to the inner edge in the up-down direction, a spring (40) is fixedly connected between the lower bottom surface of the control rod (36) and the inner bottom surface of the sliding hole (35), the control rod (36) is fixedly connected to the control frame (37), a plurality of control buckles (38) are fixedly connected to the side wall of the control frame (37), the control buckles (38) correspond to the adjustment blades (32) one by one, each control buckle (38) is provided with a sliding groove (39), and the control column (33) slides in the sliding groove (39).

2. A mixing device for rubber compound used in tire production according to claim 1, characterized in that: The mixing assembly comprises a driving shaft (12), which is fixedly connected to the output end of the driving motor (9), and a plurality of stirring blades (13) are fixedly connected to the driving shaft (12) in the circumferential direction.

3. A mixing device for a rubber compound used in tire production according to claim 1, characterized in that: A temperature control module is arranged in the temperature regulating box (5), and the temperature control module comprises: Air circulation pipeline, used to realize the circulation of air in the test chamber; A plurality of temperature sensors are evenly arranged in the air circulation pipeline and are used to detect the gas temperature in the air circulation pipeline; A refrigeration element is arranged inside the air circulation pipeline and is used to cool the air in the air circulation pipeline; The heating element is arranged inside the air circulation pipeline and is used to heat the air in the air circulation pipeline.

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