A pre-cooling device based on air flow circulation

Abstract

The application belongs to the technical field of cold air cooling, and particularly relates to a pre-cooling and cooling equipment based on air circulation, which comprises a rotating speed distribution assembly, a refrigeration driving assembly, a pressing adjusting assembly, a variable speed transmission assembly, a conveying assembly, a gas collecting assembly and a rack, the conveying assembly is arranged on the rack, the rotating speed distribution assembly comprises a conveying rotating shaft, a limiting rack, an elastic reset member and a synchronous turntable, the first sliding groove is arranged on the conveying rotating shaft in a ring shape and is uniformly distributed, and the limiting rack is slidingly arranged in the first sliding groove. The common three-phase asynchronous motor with unadjustable power and rotating speed is used to drive the conveying and refrigeration processes, and the power distribution of the two functional modules can be realized according to the pre-cooling and cooling range. The technical effect that the gas temperature is increased and the conveying speed is increased when the temperature is excessively reduced, and the gas temperature is reduced and the conveying speed is reduced when the temperature is insufficiently reduced is achieved.

Description

Technical Field

[0001] This invention belongs to the field of cold air cooling technology, specifically referring to a pre-cooling and cooling device based on airflow circulation. Background Technology

[0002] Agricultural products need to be pre-cooled before storage and processing. The core task is to quickly remove field heat, inhibit respiration, extend shelf life, and prevent agricultural products from spoiling during stacking and transportation.

[0003] Pre-cooling requires cold air to pass through the material pile, but in the traditional positive pressure blower mode, the gas has the characteristic of circulating around the outside of the material pile, so the pre-cooling effect inside the material pile is not good. Although the cold air passing through the material pile absorbs some heat, its temperature is still lower than the ambient temperature. The traditional positive pressure air supply mode cannot recover this part of the gas, which increases the overall energy consumption.

[0004] There is a reasonable range for pre-cooling; too high or too low a temperature will have negative effects. However, due to the different thicknesses of the material, crop types, and ambient temperatures, pre-cooling production lines often require complex frequency and speed regulation mechanisms, as well as automated control systems, resulting in complex structures and high costs. Summary of the Invention

[0005] In view of the above situation and to overcome the defects of the prior art, the present invention provides a pre-cooling and cooling device based on airflow circulation. This solution uses a common three-phase asynchronous motor with non-adjustable power and speed to drive both the conveying and cooling processes simultaneously. It can also allocate power between the two functional modules according to the degree of pre-cooling and cooling. This achieves the technical effect of increasing gas temperature and conveying speed when over-cooling occurs, and decreasing gas temperature and conveying speed when cooling is insufficient.

[0006] By using a telescopic cylinder to drive the abutment roller to abut the sliding disc, this solution utilizes the slow rebound characteristic of the limiting rack to achieve gear adjustment of the sliding disc through single-axis movement, thereby avoiding the problem of energy consumption required by traditional single-axis adjustment mechanisms to maintain continuous thrust.

[0007] The technical solution adopted by this invention is as follows: This invention proposes a pre-cooling and cooling device based on airflow circulation, including a speed distribution component, a refrigeration drive component, a pressing adjustment component, a speed transmission component, a conveying component, an air collection component, and a frame. The conveying component is mounted on the frame. The speed distribution component includes a conveying shaft, a limiting rack, an elastic reset component, and a synchronous turntable. The conveying shaft is provided with a first sliding groove evenly distributed in a ring. The limiting rack is engaged and slidably disposed in the first sliding groove. The elastic reset component is disposed between the bottom of the first sliding groove and the limiting rack. The synchronous turntable is rotatably disposed at the end of the conveying shaft. The end of the limiting rack is slidably disposed in the groove of the synchronous turntable. Furthermore, the transmission assembly includes a fixed disc, a sliding disc, and a transmission belt. The fixed disc is fixedly connected to the conveying shaft and the cooling drive shaft. The sliding disc is engaged and slidably disposed in the first and second sliding grooves. The transmission belt is located between the fixed disc and the sliding disc, and the transmission belt makes rolling contact with the fixed disc and the sliding disc respectively.

[0008] Preferably, the bottom of the semi-oblique tooth portion is a flat portion, which can laterally limit the sliding disk.

[0009] By changing the distance between the fixed disc and the sliding disc, the diameter of the transmission wheel composed of the two can be changed, thereby changing the speed ratio of the conveying shaft and the refrigeration drive shaft, and thus achieving power ratio control of the two processes of conveying and refrigeration.

[0010] By actively splitting the power, the pre-cooling effect can be kept stable and consistent while maintaining a constant output power of the drive motor.

[0011] Furthermore, the refrigeration drive assembly is disposed on the gas collection assembly, the pressure adjustment assembly is disposed on the frame, the speed transmission assembly is disposed between the speed distribution assembly and the refrigeration drive assembly, and the gas collection assembly is disposed above the frame.

[0012] The limiting rack has a fully helical tooth section and a semi-helical tooth section on both sides of the tooth, and the synchronous turntable has damping on the rotation of the conveying shaft.

[0013] The limiting racks are always parallel to the conveying shaft. Through the limiting of the synchronous turntable, each set of limiting racks extends and retracts synchronously. Due to the rotational resistance of the synchronous turntable, the limiting racks will slowly extend under the elastic force of the elastic reset component after retraction.

[0014] Preferably, the refrigeration drive assembly includes a refrigeration drive shaft, a flange, and a compression spring. The refrigeration drive shaft is provided with a second sliding groove evenly distributed in a ring. The flange is located at the end of the refrigeration drive shaft, and the compression spring is located between the flange and the sliding plate.

[0015] The compression spring has the function of pressing the sliding disc, and by squeezing the sliding disc, it can maintain the tension of the drive belt.

[0016] Furthermore, the pressing adjustment assembly includes a telescopic cylinder, a shift fork, an abutment roller, and a mounting bracket. The mounting bracket is mounted on the frame, the telescopic cylinder is mounted on the mounting bracket, the shift fork is mounted on the telescopic part of the telescopic cylinder, and the abutment roller is rotatably mounted on the end of the shift fork.

[0017] By pressing the sliding disc against the roller, the position of the sliding disc located on the conveying shaft can be adjusted, thereby changing the speed ratio between the conveying shaft and the refrigeration drive shaft, and realizing power control of the two processes of conveying and refrigeration.

[0018] Furthermore, the transmission assembly also includes a drive motor and a pressure wheel. The drive motor is mounted on a mounting bracket, and a drive wheel is provided on the output shaft of the drive motor. The pressure wheel is rotatably mounted on the mounting bracket. The drive wheel and the pressure wheel of the drive motor are located on both sides of the transmission belt and are in rolling contact with the transmission belt.

[0019] The drive motor and the pressure rollers squeeze the belt, which in turn drives the conveyor shaft and the refrigeration drive shaft to rotate.

[0020] Furthermore, the conveying assembly includes a roller support, a conveying roller, and a wire mesh. The roller support is mounted on the frame, the conveying shaft is rotatably mounted in the roller support, the conveying roller rotates under the support of the roller support, and the wire mesh and the conveying roller are in rolling contact.

[0021] Steel wire conveyor mesh can both support the goods and allow airflow to pass through, thereby achieving the technical purpose of pre-cooling and cooling the materials.

[0022] Furthermore, the gas collection assembly includes an outer cover, a fan, a circulation pipe, and a refrigeration unit. The outer cover is mounted on a frame and has a gas collection channel. The fan is located in the gas collection channel, the refrigeration unit is located below the wire mesh, and the circulation pipe is located between the gas collection channel and the refrigeration unit.

[0023] By guiding the airflow direction with a fan, on the one hand, the airflow can be forced through the gaps inside the material, preventing the airflow from bypassing the material; on the other hand, it can drive the airflow circulation, allowing the airflow that is still below room temperature to enter the refrigeration unit for recycling.

[0024] Furthermore, the frame is also equipped with a transmission cover for protecting the speed distribution components.

[0025] The beneficial effects achieved by the present invention using the above structure are as follows: (1) By changing the distance between the fixed disk and the sliding disk, the diameter of the transmission wheel composed of the two can be changed, thereby realizing the change of the speed ratio between the conveying shaft and the refrigeration drive shaft, and thus realizing the power ratio control of the two processes of conveying and refrigeration.

[0026] (2) By actively splitting the power, the pre-cooling effect can be kept stable and consistent while the output power of the drive motor remains constant.

[0027] (3) The limiting rack is always parallel to the conveying shaft. Through the limiting of the synchronous turntable, each set of limiting racks extends and retracts synchronously. Since there is rotational resistance on the synchronous turntable, the limiting rack will slowly extend under the elastic force of the elastic reset component after it retracts.

[0028] (4) By pressing the sliding disc with the abutting roller, the position of the sliding disc located on the conveying shaft can be adjusted, thereby changing the speed ratio between the conveying shaft and the refrigeration drive shaft, and realizing power control of the two processes of conveying and refrigeration.

[0029] (5) By squeezing the drive motor and the pressure wheel, the transmission belt can move stably, thereby realizing the rotation drive of the conveying shaft and the refrigeration drive shaft.

[0030] (6) The steel wire conveyor can both support the goods and allow airflow to pass through, thereby achieving the technical purpose of pre-cooling and cooling the materials.

[0031] (7) By guiding the airflow direction through the fan, on the one hand, the airflow can be forced through the gaps inside the material to avoid the airflow going around the outside of the material; on the other hand, the airflow can be driven to circulate, so that the airflow that is still below room temperature can enter the refrigerator for recycling. Attached Figure Description

[0032] Figure 1 This is a perspective view of a pre-cooling and cooling device based on airflow circulation proposed in this invention; Figure 2 This is a front view of a pre-cooling and cooling device based on airflow circulation proposed in this invention; Figure 3 for Figure 2 A cross-sectional view along section line AA; Figure 4 for Figure 3 A cross-sectional view along the cutting line BB; Figure 5 for Figure 2 A cross-sectional view along the section line CC; Figure 6 This is an exploded structural diagram of a pre-cooling device based on airflow circulation proposed in this invention. Figure 7for Figure 3 A magnified view of a section at point I; Figure 8 for Figure 5 Enlarged view of a section at point II; Figure 9 for Figure 6 Enlarged view of a section at point III; Figure 10 for Figure 1 A magnified view of a section at point IV.

[0033] The components include: 1. Speed ​​distribution assembly; 2. Refrigeration drive assembly; 3. Press adjustment assembly; 4. Speed ​​transmission assembly; 5. Conveying assembly; 6. Gas collection assembly; 7. Frame; 11. Conveying shaft; 12. Limiting rack; 13. Elastic reset component; 14. Synchronous turntable; 21. Refrigeration drive shaft; 22. Flange; 23. Compression spring; 31. Telescopic cylinder; 32. Shift fork; 33. Abutment roller; 34. Mounting bracket; 41. Fixed plate; 42. Sliding plate; 43. Transmission belt; 44. Drive motor; 45. Compression wheel; 51. Roller bracket; 52. Conveying roller; 53. Wire conveyor mesh; 61. Outer cover; 62. Fan; 63. Circulation pipe; 64. Refrigeration unit; 71. Transmission cover; 111. First chute; 121. Fully inclined tooth section; 122. Semi-inclined tooth section; 211. Second chute; 611. Gas collection channel.

[0034] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0036] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0037] like Figures 1-10As shown, the present invention proposes a pre-cooling and cooling device based on airflow circulation, including a speed distribution component 1, a refrigeration drive component 2, a pressing adjustment component 3, a speed transmission component 4, a conveying component 5, an air collection component 6, and a frame 7. The conveying component 5 is mounted on the frame 7. The speed distribution component 1 includes a conveying shaft 11, a limiting rack 12, an elastic reset component 13, and a synchronous turntable 14. The conveying shaft 11 is provided with a first sliding groove 111 evenly distributed in a ring. The limiting rack 12 is engaged and slidably disposed in the first sliding groove 111. The elastic reset component 13 is disposed between the bottom of the first sliding groove 111 and the limiting rack 12. The synchronous turntable 14 is rotatably disposed at the end of the conveying shaft 11, and the end of the limiting rack 12 is slidably disposed in the groove of the synchronous turntable 14. The transmission assembly 4 includes a fixed disk 41, a sliding disk 42, and a transmission belt 43. The fixed disk 41 is fixedly connected to the conveying shaft 11 and the cooling drive shaft 21. The sliding disk 42 is engaged and slidably disposed in the first slide groove 111 and the second slide groove 211. The transmission belt 43 is located between the fixed disk 41 and the sliding disk 42, and the transmission belt 43 makes rolling contact with the fixed disk 41 and the sliding disk 42 respectively.

[0038] The bottom of the semi-oblique toothed part 122 is a flat part, which can laterally limit the sliding disk 42.

[0039] By changing the distance between the fixed disk 41 and the sliding disk 42, the diameter of the transmission wheel composed of the two can be changed, thereby changing the speed ratio of the conveying shaft 11 and the refrigeration drive shaft 21, and thus realizing the power ratio control of the two processes of conveying and refrigeration.

[0040] By actively splitting the power, the pre-cooling effect can be kept stable and consistent while maintaining a constant output power of the drive motor 44.

[0041] The refrigeration drive assembly 2 is located on the gas collection assembly 6, the pressure adjustment assembly 3 is located on the frame 7, the speed transmission assembly 4 is located between the speed distribution assembly 1 and the refrigeration drive assembly 2, and the gas collection assembly 6 is located above the frame 7.

[0042] The teeth of the limiting rack 12 are provided with a fully helical tooth section 121 and a semi-helical tooth section 122 on both sides, and the rotation of the synchronous turntable 14 on the conveying shaft 11 is damped.

[0043] The limiting rack 12 is always parallel to the conveying shaft 11. Through the limiting of the synchronous turntable 14, each set of limiting racks 12 extends and retracts synchronously. Since the synchronous turntable 14 has rotational resistance, the limiting rack 12 will slowly extend under the elastic force of the elastic reset member 13 after retraction.

[0044] The refrigeration drive assembly 2 includes a refrigeration drive shaft 21, a flange 22, and a compression spring 23. The refrigeration drive shaft 21 is provided with a second sliding groove 211 evenly distributed in a ring. The flange 22 is located at the end of the refrigeration drive shaft 21, and the compression spring 23 is located between the flange 22 and the sliding plate 42.

[0045] The compression spring 23 has the function of pressing the sliding disc 42. By squeezing the sliding disc 42, it can maintain the tension of the transmission belt 43.

[0046] The pressing adjustment assembly 3 includes a telescopic cylinder 31, a shift fork 32, an abutment roller 33, and a mounting bracket 34. The mounting bracket 34 is mounted on the frame 7, the telescopic cylinder 31 is mounted on the mounting bracket 34, the shift fork 32 is mounted on the telescopic part of the telescopic cylinder 31, and the abutment roller 33 is rotatably mounted on the end of the shift fork 32.

[0047] By pressing the sliding disk 42 against the roller 33, the position of the sliding disk 42 located on the conveying shaft 11 can be adjusted, thereby changing the speed ratio between the conveying shaft 11 and the refrigeration drive shaft 21, and realizing power control of the two processes of conveying and refrigeration.

[0048] The transmission assembly 4 also includes a drive motor 44 and a pressure wheel 45. The drive motor 44 is mounted on the mounting bracket 34, and a drive wheel is mounted on the output shaft of the drive motor 44. The pressure wheel 45 is rotatably mounted on the mounting bracket 34. The drive wheel of the drive motor 44 and the pressure wheel 45 are located on both sides of the transmission belt 43 and are in rolling contact with the transmission belt 43.

[0049] The drive motor 44 and the pressure wheel 45 squeeze the belt 43 to make it move stably, thereby driving the rotation of the conveyor shaft 11 and the cooling drive shaft 21.

[0050] The conveying assembly 5 includes a roller support 51, a conveying roller 52, and a wire mesh 53. The roller support 51 is mounted on the frame 7, and the conveying shaft 11 is rotatably mounted in the roller support 51. The conveying roller 52 rotates under the support of the roller support 51, and the wire mesh 53 and the conveying roller 52 are in rolling contact.

[0051] The steel wire conveyor mesh 53 can both support the goods and allow airflow to pass through, thereby achieving the technical purpose of pre-cooling and cooling the materials.

[0052] The gas collection assembly 6 includes an outer cover 61, a fan 62, a circulation pipe 63, and a chiller 64. The outer cover 61 is mounted on the frame 7 and has a gas collection channel 611. The fan 62 is located in the gas collection channel 611. The chiller 64 is located below the wire mesh 53. The circulation pipe 63 is located between the gas collection channel 611 and the chiller 64.

[0053] By guiding the airflow direction through the fan 62, the airflow can be forced through the gaps inside the material, preventing the airflow from bypassing the material; on the other hand, the airflow can be driven to circulate, allowing the airflow that is still below room temperature to enter the refrigeration unit 64 for recycling.

[0054] The frame 7 is also equipped with a transmission cover 71 for protecting the speed distribution assembly 1.

[0055] like Figure 4 As shown, the arrow indicates the direction of airflow. Cold air is slowly discharged from the refrigeration unit 64. If the fan 62 is installed near the refrigeration unit 64, the upward airflow will bypass the material pile after impacting it, making it difficult to enter the material pile. In this solution, the fan 62 is installed in the air collection channel 611, and the negative pressure is used to draw the airflow from below, so that the cold air in the refrigeration unit 64 can uniformly cool the inside of the material pile. Because the airflow speed is slow, the cold air will move a distance to the right along with the wire mesh 53 and the material, and then enter the air collection channel 611 after exiting the material pile.

[0056] In practical use, the user first needs to start the drive motor 44 and the fan 62. The transmission belt 43, which is clamped by the drive wheel and the pressure wheel 45 of the drive motor 44, will drive the conveyor shaft 11 and the refrigeration drive shaft 21 to rotate when it moves. When the conveyor shaft 11 rotates, it will drive the steel wire conveyor mesh 53 to move. When the refrigeration drive shaft 21 rotates, it will drive the compressor to work and achieve refrigeration. The conveyor belt in the previous process transports the material onto the wire mesh 53. As the material moves along with the wire mesh 53, the negative pressure generated below the circulation pipe 63 causes the gas below to pass through the wire mesh 53 and the inside of the material pile and enter the gas collection channel 611. The airflow path is as follows: Figure 4 As shown; Gas below room temperature in the gas collection channel 611 will flow back to the refrigerator 64 through the circulation pipe 63.

[0057] A temperature sensor is installed at the end of the outer cover 61 away from the gas collection channel 611. The temperature sensor value is used to provide feedback on the pre-cooling effect. If the temperature is higher than the preset range, it indicates that the pre-cooling effect is not good. At this time, it is necessary to reduce the speed of the conveying shaft 11 (reduce the material conveying speed) and increase the speed of the refrigeration drive shaft 21 (increase the refrigeration power). The telescopic cylinder 31 drives the mounting bracket 34 to move until the abutment roller 33 abuts against the sliding disk 42 located on the conveying shaft 11. The abutment roller 33 and the sliding disk 42 make rolling contact. By pushing the sliding disk 42, the distance between the fixed disk 41 and the sliding disk 42 on the conveying shaft 11 is reduced, thereby increasing the equivalent diameter of the transmission wheel. While the speed of the transmission belt 43 remains unchanged, the rotational speed of the conveying shaft 11 is reduced. Since the length of the transmission belt 43 remains unchanged, while the rotational speed of the conveying shaft 11 decreases, the rotational speed of the refrigeration drive shaft 21 will inevitably increase due to the reduction of the equivalent diameter of the transmission wheel, thereby increasing the refrigeration power and making the temperature of the cold air used for pre-cooling even lower.

[0058] If the temperature reading of the sensor is lower than the preset range, it indicates that the pre-cooling is excessive. At this time, the abutting roller 33 first pushes the sliding disk 42 to move by half the tooth pitch of the limiting rack 12. During this process, the limiting rack 12 first overcomes the elastic force of the elastic reset member 13 and retracts. Then the telescopic cylinder 31 resets. Since the sliding disk 42 located on the cooling drive shaft 21 is squeezed by the elastic force of the compression spring 23 and approaches the fixed disk 41, the sliding disk 42 located on the conveying shaft 11 tends to move away from the fixed disk 41 under the compression of the transmission belt 43. When the sliding disk 42 abuts against another tooth, it contacts the semi-inclined tooth 122 (there is rotational resistance between the synchronous turntable 14 and the conveying shaft 11, and the limiting rack 12 has not fully rebounded at this time). Therefore, the limiting rack 12 can slide outward beyond the tooth of the limiting rack 12 until the sliding disk 42 abuts against the abutting roller 33 again. The sliding disk 42 remains in its current position for a period of time under the limit of the abutting roller 33. The limiting rack 12 will then be fully reset under the elastic force of the elastic reset member 13. At this time, the limiting rack 12 will once again lock the position of the sliding disk 42. Subsequently, the telescopic cylinder 31 can be fully reset with the mounting bracket 34.

[0059] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0060] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A pre-cooling and temperature-reducing device based on airflow circulation, comprising a conveying assembly (5) and a frame (7), wherein the conveying assembly (5) is disposed on the frame (7), characterized in that, Also includes: The speed distribution assembly (1) includes a conveying shaft (11), a limiting rack (12), an elastic reset member (13), and a synchronous turntable (14). The conveying shaft (11) is provided with a first slide groove (111) evenly distributed in a ring. The limiting rack (12) is engaged and slidably disposed in the first slide groove (111). The elastic reset member (13) is disposed between the bottom of the first slide groove (111) and the limiting rack (12). The synchronous turntable (14) is rotatably disposed at the end of the conveying shaft (11). The end of the limiting rack (12) is slidably disposed in the groove of the synchronous turntable (14). The cooling drive assembly (2), the press adjustment assembly (3), the speed transmission assembly (4), and the gas collection assembly (6) are provided. The cooling drive assembly (2) is located on the gas collection assembly (6), the press adjustment assembly (3) is located on the frame (7), the speed transmission assembly (4) is located between the speed distribution assembly (1) and the cooling drive assembly (2), and the gas collection assembly (6) is located above the frame (7). The limiting rack (12) has a fully helical tooth section (121) and a semi-helical tooth section (122) on both sides of the tooth, and the synchronous turntable (14) has damping on the rotation of the conveying shaft (11); The refrigeration drive assembly (2) includes a refrigeration drive shaft (21), a flange (22) and a compression spring (23). The refrigeration drive shaft (21) is provided with a second sliding groove (211) evenly distributed in a ring. The flange (22) is located at the end of the refrigeration drive shaft (21), and the compression spring (23) is located on the flange (22). The pressing adjustment assembly (3) includes a telescopic cylinder (31), a shift fork (32), an abutment roller (33), and a mounting bracket (34). The mounting bracket (34) is mounted on the frame (7), the telescopic cylinder (31) is mounted on the mounting bracket (34), the shift fork (32) is mounted on the telescopic part of the telescopic cylinder (31), and the abutment roller (33) is rotatably mounted on the end of the shift fork (32). The transmission assembly (4) includes a fixed disk (41), a sliding disk (42), and a transmission belt (43). The fixed disk (41) is fixed to the conveying shaft (11) and the cooling drive shaft (21). The sliding disk (42) is engaged and slidably disposed in the first slide groove (111) and the second slide groove (211). The transmission belt (43) is located between the fixed disk (41) and the sliding disk (42). The transmission belt (43) makes rolling contact with the fixed disk (41) and the sliding disk (42) respectively. The bottom of the semi-oblique toothed part (122) is a flat part, which can laterally limit the sliding disk (42).

2. The pre-cooling and temperature-reducing device based on airflow circulation according to claim 1, characterized in that: The transmission assembly (4) further includes a drive motor (44) and a pressure wheel (45). The drive motor (44) is mounted on a mounting bracket (34). A drive wheel is provided on the output shaft of the drive motor (44). The pressure wheel (45) is rotatably mounted on the mounting bracket (34). The drive wheel and the pressure wheel (45) of the drive motor (44) are located on both sides of the transmission belt (43) and are in rolling contact with the transmission belt (43).

3. The pre-cooling and temperature-reducing device based on airflow circulation according to claim 2, characterized in that: The conveying assembly (5) includes a roller support (51), a conveying roller (52) and a wire mesh (53). The roller support (51) is mounted on the frame (7). The conveying shaft (11) is rotatably mounted in the roller support (51). The conveying roller (52) rotates under the support of the roller support (51). The wire mesh (53) and the conveying roller (52) are in rolling contact.

4. The pre-cooling and temperature-reducing device based on airflow circulation according to claim 3, characterized in that: The gas collection assembly (6) includes an outer cover (61), a fan (62), a circulation pipe (63), and a chiller (64). The outer cover (61) is mounted on the frame (7), and the outer cover (61) is provided with a gas collection channel (611). The fan (62) is located in the gas collection channel (611), and the chiller (64) is located below the wire mesh (53). The circulation pipe (63) is located between the gas collection channel (611) and the chiller (64).

5. A pre-cooling and temperature-reducing device based on airflow circulation according to claim 4, characterized in that: The frame (7) is also provided with a transmission cover (71) for protecting the speed distribution assembly (1).

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