Cooling device for PCR material wire drawing

Abstract

The application discloses a cooling device for PCR material wire drawing, which comprises a conveying mechanism, a tensioning mechanism arranged above the conveying mechanism, and a blowing mechanism arranged in parallel with the tensioning mechanism; the tensioning mechanism comprises a first tensioning roller and a second tensioning roller arranged directly above the first tensioning roller, and the diameter of the first tensioning roller is larger than that of the second tensioning roller; the blowing mechanism comprises a wind supply cylinder body, the upper end of the wind supply cylinder body is provided with an air inlet, and the lower end is provided with an air outlet assembly, wherein the thickness of the hollow cavity of the wind supply cylinder body gradually decreases along the direction from top to bottom; the air outlet assembly comprises a wind deflector and a wind baffle arranged on both sides of the wind deflector to form an air outlet, and the airflow of the air outlet is in a curved air outlet mode; the Coanda effect is formed to make the airflow closely flow along the curved surface, the airflow is sprayed out from the air outlet in a preset curved trajectory, the surface of the wire material is preferably covered at a better incident angle, the wire material warping caused by internal stress is significantly reduced, and the product quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wire drawing cooling devices, and in particular to a cooling device for PCR material wire drawing. Background Art

[0002] During the wire drawing process, recycled polycarbonate glycol (PCR) plastic requires rapid and uniform cooling to stabilize the molecular chain structure and prevent warping or breakage of the wire due to concentrated thermal stress. This material is highly temperature-sensitive, making cooling efficiency and uniformity crucial for ensuring the mechanical properties and surface finish of the wire, particularly in environmentally friendly recycling applications. This is crucial for ensuring the pass rate of high-end wire drawing products.

[0003] The industry currently generally uses air-cooled cooling devices, which mostly use oblique injection or parallel air supply. Although the oblique blowing design can increase the airflow coverage area, when the high-speed airflow impacts the curved surface of the wire, it will form counter-turbulent areas on the windward and leeward sides, resulting in local pressure imbalance and causing high-frequency vibration of the wire. While parallel air supply reduces vertical impact force, the contact angle between the airflow and the wire surface is too small, making it difficult to effectively destroy the thermal boundary layer, significantly reducing heat transfer efficiency. Neither of the above two methods can simultaneously resolve the contradiction between cooling uniformity and wire stability. Insufficient cooling in the turbulent area induces internal stress concentration, and vibration exacerbates wire diameter fluctuations, ultimately resulting in defects such as uneven crystallinity and surface microcracks in the recycled plastic wire.

[0004] In view of this, it is necessary to improve the wire cooling device in the prior art to solve the technical problems of counter-turbulence and boundary layer retention caused by the design defects of the airflow trajectory. Summary of the Invention

[0005] The purpose of the present invention is to provide a cooling device for PCR material drawing to solve the above technical problems.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A cooling device for PCR material drawing, comprising a conveying mechanism, a tensioning mechanism arranged above the conveying mechanism, and a blower mechanism arranged parallel to the tensioning mechanism;

[0008] The tensioning mechanism includes a first tensioning roller and a second tensioning roller disposed directly above the first tensioning roller, wherein the diameter of the first tensioning roller is larger than the diameter of the second tensioning roller;

[0009] The blower mechanism includes an air supply cylinder, an upper end of the air supply cylinder is provided with an air inlet, and a lower end thereof is provided with an air outlet assembly, wherein the thickness of the hollow cavity of the air supply cylinder is gradually reduced from top to bottom;

[0010] The air outlet assembly includes an air guide plate and wind shields arranged on both sides of the air guide plate to form an air outlet; one end of the air guide plate is connected to the air supply cylinder, and the air guide plate is provided with an inner curved surface extending along a preset curve so that the airflow of the air outlet is discharged in a curved manner.

[0011] Optionally, the air supply cylinder includes an upper plate body, and two opposite expansion plates and two opposite air confinement plates are provided on the side of the upper plate body, and the distance between the two air confinement plates is set to be the thickness of the hollow cavity;

[0012] The two expansion plates are gradually extended outward from top to bottom, and the inclination angle of the expansion plates is preset to a, so that the cross-sectional area of ​​the hollow cavity is gradually reduced from top to bottom.

[0013] Optionally, the number of the tensioning mechanisms is two groups, and the two groups of tensioning mechanisms are arranged side by side along the conveying direction of the conveying mechanism;

[0014] A separation space is provided between the two groups of the tensioning mechanisms, at least one group of the air blowing mechanisms is accommodated in the separation space, and another group of the air blowing mechanisms is provided on at least one outward side of the tensioning mechanism.

[0015] Optionally, a plurality of groups of tension roller assemblies are provided above the conveying mechanism, and the plurality of groups of tension roller assemblies are respectively provided on both sides of the tensioning mechanism;

[0016] The tension roller assembly includes a tension roller body disposed transversely through the conveying mechanism, and a height adjustment member is disposed on both sides of the tension roller body;

[0017] The height adjustment member is provided with an adjustment slot and an adjustment bolt, one end of the tension roller body is slidably connected to the adjustment slot, and the adjustment bolt is threadedly connected to the height adjustment member and one end of the adjustment bolt is connected to the tension roller body;

[0018] A compression spring is sleeved on the adjusting bolt, one end of the compression spring is connected to one end of the tensioning roller body, and the compression spring is used to drive the tensioning roller body to move in a direction away from the tensioning roller body.

[0019] Optionally, the tensioning mechanism also includes a lifting assembly arranged between the first tensioning roller and the second tensioning roller, the lifting assembly includes a crossbeam column fixed on the frame, the upper end surface of the crossbeam column is provided with a first driving member, the driving end of the first driving member is connected to the first base, the second tensioning roller is rotatably connected to the first base, and the first driving member is used to adjust the distance between the first tensioning roller and the second tensioning roller.

[0020] Optionally, the tensioning mechanism further includes a conveyor belt jointly sleeved outside the first tensioning roller and the second tensioning roller, and the conveyor belt is used to drive the wire to move.

[0021] Optionally, the first tensioning roller includes a main body roller and an intermediate shaft provided through the main body roller, wherein the intermediate shaft is rotatably connected to the main body roller via a bearing;

[0022] One end portion of the body roller is connected to a first pulley via a connecting seat. The first pulley is connected to a second driving member. The second driving member is used to drive the first pulley to rotate.

[0023] Optionally, an eccentric rod is provided at one end of the main roller, a connecting plate is provided at one end of the crossbeam, one end of the eccentric rod is rotatably connected to the connecting plate and a swing rod is provided through the connecting plate;

[0024] A third driving member is also provided on the connecting plate, and a connecting rod is provided at the driving end of the third driving member. A rotating joint is provided at one end of the connecting rod, and one end of the swing rod is rotatably connected to the connecting rod through the rotating joint. The third driving member operates to drive the swing rod to drive the main body roller to swing eccentrically.

[0025] Optionally, the conveying mechanism includes a conveyor belt assembly and a fourth driving member for driving the conveyor belt assembly to rotate;

[0026] A plurality of leveling assemblies are provided on the peripheral side of the conveyor belt assembly, and the leveling assemblies are connected by connecting shafts.

[0027] Optionally, the leveling assembly includes an elevator, a screw is provided at the driving end of the elevator, a connecting end cover is provided at the top of the screw, a rotating hole is opened at the top of the connecting end cover, a top rod is rotatably connected in the rotating hole, and one end of the top rod is connected to the conveyor belt assembly.

[0028] Compared with the prior art, the present invention has the following beneficial effects: during operation, the PCR material is horizontally conveyed by the conveying mechanism after drawing, and the high-temperature wire moves to the cooling station along the set path. The wire passes through the first tensioning roller and the second tensioning roller in turn, and the two cooperate to form a wedge-shaped tensioning area to ensure that the wire remains straight and the tension is constant during the cooling process. In the blowing mechanism, the external fan supplies air to the air inlet at the upper end of the air supply cylinder, and the air flow enters the conical cavity which is wide at the top and narrow at the bottom. The air flow is accelerated and pressurized due to the reduction in cross-sectional area. The high-speed air flow reaches the air outlet component and is guided by the inner curved air guide plate to form a Coanda effect so that the air flow flows close to the curved surface. The air flow is ejected from the air outlet in a preset curved trajectory, covering the surface of the wire with a better incident angle, reducing the vertical force of the air flow on the wire, and extending the effective heat exchange time, significantly reducing the warping of the wire caused by internal stress, and enabling the wire to complete rapid cooling and shaping under a stable tension state, thereby improving the quality of the finished product. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] The structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not intended to limit the conditions under which the present invention can be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportional relationships, or adjustments in size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and objectives that can be achieved by the present invention.

[0031] Figure 1 A schematic side view of the overall structure of a cooling device for PCR material drawing;

[0032] Figure 2 This is a schematic diagram of the overall structure of the cooling device for PCR material drawing;

[0033] Figure 3 This is a schematic diagram of the structure of the blower mechanism of the cooling device for PCR material drawing;

[0034] Figure 4 This is a schematic diagram of the structure of the tension roller assembly of the cooling device for PCR material drawing;

[0035] Figure 5 This is a schematic diagram of the structure of the tensioning mechanism of the cooling device for PCR material drawing;

[0036] Figure 6This is a schematic diagram of the structure of the first tensioning roller of the cooling device for PCR material drawing;

[0037] Figure 7 This is a schematic diagram of the structure of the second tensioning roller and lifting assembly of the cooling device for PCR material drawing.

[0038] Illustrations: conveying mechanism 10, tensioning mechanism 20, blowing mechanism 30, first tensioning roller 21, second tensioning roller 22, air supply cylinder 31, air inlet 32, air outlet assembly 33, air guide plate 331, wind shield 332, inner curved surface 333, upper plate 311, expansion plate 312, air restraining plate 313, tensioning roller assembly 40, tensioning roller body 41, height adjustment member 42, adjustment slot 421, adjustment bolt 422, compression spring 423, lifting assembly Part 50, crossbeam 51, first drive member 52, first base 53, conveyor belt 23, main body roller 211, intermediate shaft 212, first pulley 213, second drive member 214, eccentric rod 215, connecting plate 216, swing rod 217, third drive member 218, connecting rod 219, conveyor belt assembly 11, fourth drive member 12, leveling assembly 13, connecting shaft 14, elevator 131, screw rod 132, connecting end cover 133, and top rod 134. DETAILED DESCRIPTION

[0039] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally located component.

[0041] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0042] Combine Figures 1 to 7As shown, an embodiment of the present invention provides a cooling device for PCR material drawing, including a conveying mechanism 10, a tensioning mechanism 20 arranged above the conveying mechanism 10, and a blowing mechanism 30 arranged parallel to the tensioning mechanism 20; the tensioning mechanism 20 includes a first tensioning roller 21, and a second tensioning roller 22 arranged directly above the first tensioning roller 21, and the diameter of the first tensioning roller 21 is larger than the diameter of the second tensioning roller 22.

[0043] It should be noted that the first tensioning roller 21 (large diameter) and the second tensioning roller 22 (small diameter) with different diameters are vertically opposed to each other. The large diameter roller provides a stable support surface, and the small diameter roller applies downward pressure. The two form a wedge-shaped tension zone to avoid wire diameter fluctuations caused by thermal deformation.

[0044] The blower mechanism 30 includes an air supply cylinder 31, an air inlet 32 ​​is provided at the upper end of the air supply cylinder 31, and an air outlet assembly 33 is provided at the lower end thereof, wherein the thickness of the hollow cavity of the air supply cylinder 31 is gradually reduced from top to bottom;

[0045] The core airflow acceleration component of the blower mechanism 30: the top air inlet 32 ​​is connected to the high-pressure blower; the conical gradient cavity (wide at the top and narrow at the bottom) uses the Venturi effect to continuously reduce the cross-sectional area of ​​the airflow during the descent process, realizing the conversion of static pressure energy into kinetic energy, and the outlet airflow obtains high-speed supercharging characteristics.

[0046] The air outlet assembly 33 includes an air guide plate 331 and wind shields 332 arranged on both sides of the air guide plate 331 to form an air outlet; one end of the air guide plate 331 is connected to the air supply cylinder 31, and the air guide plate 331 is provided with an inner curved surface 333 extending along a preset curve so that the airflow at the air outlet is discharged in a curved manner.

[0047] It should be noted that the air guide plate 331 integrates a preset curved inner surface 333 (such as a parabola or Euler spiral), which guides the airflow to flow close to the curved surface through the Coanda effect; the double-sided wind shields 332 constrain the airflow width to form an airflow outlet space, outputting low-impact, high-adhesion curved airflow to tangentially cover the wire surface, significantly extending the effective cooling path and weakening the vertical impact force.

[0048] The working principle of the present invention is as follows: during operation, the PCR material is horizontally conveyed by the conveying mechanism 10 after being drawn, and the high-temperature wire moves to the cooling station along a set path. The wire passes through the first tensioning roller 21 and the second tensioning roller 22 in sequence, and the two cooperate to form a wedge-shaped tensioning area to ensure that the wire remains straight and the tension is constant during the cooling process. In the blowing mechanism 30, the external fan supplies air to the air inlet 32 ​​at the upper end of the air supply cylinder 31, and the air flow enters the conical cavity which is wide at the top and narrow at the bottom. The air flow is accelerated and pressurized due to the reduction in cross-sectional area. The high-speed air flow reaches the air outlet component 33 and is guided by the air guide plate 331 on the inner curved surface 333 to form a Coanda effect so that the air flow flows close to the curved surface. The air flow is ejected from the air outlet in a preset curved trajectory, covering the surface of the wire with a better incident angle, reducing the vertical force of the air flow on the wire, and extending the effective heat exchange time, significantly reducing the warping of the wire caused by internal stress, and allowing the wire to complete rapid cooling and shaping under a stable tension state, thereby improving the quality of the finished product.

[0049] In this embodiment, it is further explained that the air supply cylinder 31 includes an upper plate body 311, and two opposite expansion plates 312 and two opposite air binding plates 313 are provided on the side of the upper plate body 311, and the spacing between the two air binding plates 313 is set to the thickness of the hollow cavity; wherein, the two expansion plates 312 are gradually extended outward in a top-down direction, and the inclination angle of the expansion plates 312 is preset to a, so that the cross-sectional area of ​​the hollow cavity from top to bottom is gradually reduced.

[0050] It should be noted that it expands outward from top to bottom at a preset inclination angle α (α>0°), and cooperates with the air confinement plate 313 to form a flow channel with a gradually decreasing cross-section; the adjustable inclination angle α is designed to adapt to different wind pressure requirements, and the air confinement plate 313 maintains the throat size to solve the problem of uneven flow rate caused by the deformation of the conical cavity processing.

[0051] In this embodiment, there are two groups of tensioning mechanisms 20, and the two groups of tensioning mechanisms 20 are arranged side by side along the conveying direction of the conveying mechanism 10; a spacing space is provided between the two groups of tensioning mechanisms 20, and at least one group of blower mechanisms 30 is placed in the spacing space, and another group of blower mechanisms 30 is provided on at least one side of the tensioning mechanism 20 facing outward.

[0052] At least one set of blowing mechanisms 30 is embedded in the interval space reserved between the two sets of tensioning mechanisms 20 to achieve direct cooling of the middle part of the wire. Another set of blowing mechanisms 30 is added outside the tensioning mechanism 20 to form a "sandwich" cooling layout (internal and external airflow clamping), forming a multi-stage cooling effect.

[0053] In the embodiment, it is further illustrated that a plurality of sets of the pressing roller assemblies 40 are arranged above the conveying mechanism 10, and the plurality of sets of the pressing roller assemblies 40 are arranged on both sides of the tensioning mechanism 20 respectively; the pressing roller assembly 40 comprises a pressing roller body 41 arranged transversely through the conveying mechanism 10, and a height adjusting member 42 is arranged on each side of the pressing roller body 41.

[0054] The height adjusting member 42 is provided with an adjusting groove 421 and an adjusting screw 422, one end of the pressing roller body 41 is connected to the adjusting groove 421 in a sliding manner, the adjusting screw 422 is threadedly connected to the height adjusting member 42 and one end of the adjusting screw 422 is connected to the pressing roller body 41; a compression spring 423 is sleeved on the adjusting screw 422, one end of the compression spring 423 is connected to one end of the pressing roller body 41, and the compression spring 423 is used to drive the pressing roller body 41 to move away from the pressing roller body 41.

[0055] It should be noted that when the wire material passes through the closed loop channel formed by the first tensioning roller 21, the pressing roller body 41 and the second tensioning roller 22 along the conveying path:

[0056] Initial tensioning: the compression spring 423 pushes the pressing roller body 41 upwards, so that the roller body is in a high position and a basic tensioning force is applied to the wire material.

[0057] Dynamic adjustment: if the tension needs to be increased, the adjusting screw 422 is tightened → the deformation amount of the compression spring 423 is increased → the roller body is pushed to move downwards along the adjusting groove 421 → the wire material path is lengthened and the tension is increased;

[0058] If the tension needs to be reduced, the adjusting screw 422 is loosened → the deformation amount of the spring is reduced → the roller body is moved upwards to reset → the wire material path is relaxed and the tension is reduced.

[0059] Self-adaptive compensation: when the wire material expands or contracts due to temperature changes or speed fluctuations, the spring elasticity automatically absorbs the displacement to maintain the constant tension in real time.

[0060] In the embodiment, the tensioning mechanism 20 further comprises a lifting assembly 50 arranged between the first tensioning roller 21 and the second tensioning roller 22, the lifting assembly 50 comprises a cross beam column 51 fixed to the rack, a first driving member 52 is arranged on the upper end surface of the cross beam column 51, the driving end of the first driving member 52 is connected to a first base 53, and the second tensioning roller 22 is rotationally connected to the first base 53, and the first driving member 52 is used to adjust the distance between the first tensioning roller 21 and the second tensioning roller 22.

[0061] In the embodiment, it is further illustrated that the tensioning mechanism 20 further comprises a compression belt which is sleeved outside the first tensioning roller 21 and the second tensioning roller 22, and the compression belt is used to drive the wire material to move.

[0062] It should be noted that, by bringing the first tensioning roller 21 and the second tensioning roller 22 closer together, the compression belt can be quickly relaxed and then removed, making it easier to replace it. At the same time, the compression belt is tensioned by resetting the first tensioning roller 21 and the second tensioning roller 22. During the operation of the tensioning roller, direct contact with the surface of the wire will cause wear and loss on the surface of the tensioning roller. Since the installation of the tensioning roller itself is relatively complicated, it is not easy to replace, resulting in a long replacement cycle. This solution adopts a more convenient way of replacing two sets of tensioning rollers in combination with a compression belt, and uses the compression belt as a consumable to achieve quick replacement, while ensuring industrial production capacity. The cost of replacing a single compression belt is lower, which is convenient for reducing production costs.

[0063] In this embodiment, it is further explained that the first tensioning roller 21 includes a main roller 211 and an intermediate shaft 212 arranged to pass through the main roller 211, and the intermediate shaft 212 is rotatably connected to the main roller 211 through a bearing; one end of the main roller 211 is connected to the first pulley 213 through a connecting seat, and the first pulley 213 is connected to the second driving member 214, and the second driving member 214 is used to drive the first pulley 213 to rotate.

[0064] An eccentric rod 215 is provided at one end of the main roller 211, and a connecting plate 216 is provided at one end of the crossbeam column 51. One end of the eccentric rod 215 is rotatably connected to the connecting plate 216 and a swing rod 217 is provided through the connecting plate 216; a third driving member 218 is also provided on the connecting plate 216, and a connecting rod 219 is provided at the driving end of the third driving member 218. A rotating joint is provided at one end of the connecting rod 219, and one end of the swing rod 217 is rotatably connected to the connecting rod 219 through the rotating joint. The third driving member 218 operates to drive the swing rod 217 to drive the main roller 211 to swing eccentrically.

[0065] It should be noted that the first tensioning roller 21 in this solution drives the main body roller 211 to rotate through the second driving member 214, thereby realizing the driving work of the compression belt; at the same time, a swing rod 217, a third driving member 218 and a transmission structure of the rotating joint are set at the other end of the main body roller 211 to drive the first tensioning roller 21 to fine-tune the tensioning force, wherein the eccentric distance between the eccentric rod 215 and the main body roller 211 is small, so its swing stroke is small, and its purpose is to cooperate with the lifting assembly 50 to realize the tensioning force pre-tightening work after the tensioning belt is reset. Because this solution drives the ribbon to rotate through the tensioning belt, the tensioning belt in this solution needs to pay special attention to its own tensioning force to avoid relaxation and slipping, resulting in poor ribbon transportation, thereby affecting its quality.

[0066] In this embodiment, the conveying mechanism 10 includes a conveyor belt assembly 11 and a fourth driving member 12 for driving the conveyor belt assembly 11 to rotate; a plurality of leveling assemblies 13 are provided on the peripheral side of the conveyor belt assembly 11, and the leveling assemblies 13 are connected by connecting shafts 14, and the connecting shafts are maintained in balance and stability by a commutator.

[0067] In this embodiment, it is specifically described that the leveling assembly 13 includes an elevator 131, a screw rod 132 is provided at the driving end of the elevator 131, a connecting end cover 133 is provided at the top of the screw rod 132, a rotating hole is opened at the top of the connecting end cover 133, a top rod 134 is rotatably connected in the rotating hole, and one end of the top rod 134 is connected to the conveyor belt assembly 11.

[0068] It should be noted that the conveying mechanism 10 in this scheme adjusts the height level of its circumferential side through multiple sets of leveling components 13. Its specific working principle is: the elevator 131 operates through a matching method similar to the screw rod 132 nut (connecting end cover 133) to drive the height adjustment of the corresponding point.

[0069] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cooling device for PCR material drawing, characterized in that: It comprises a conveying mechanism (10), a tensioning mechanism (20) arranged above the conveying mechanism (10), and a blower mechanism (30) arranged parallel to the tensioning mechanism (20); The tensioning mechanism (20) comprises a first tensioning roller (21) and a second tensioning roller (22) arranged directly above the first tensioning roller (21), wherein the diameter of the first tensioning roller (21) is larger than the diameter of the second tensioning roller (22); The air blowing mechanism (30) comprises an air supply cylinder (31), an upper end portion of the air supply cylinder (31) is provided with an air inlet (32), and a lower end portion thereof is provided with an air outlet assembly (33), wherein the thickness of the hollow cavity of the air supply cylinder (31) is gradually reduced in a direction from top to bottom; The air outlet assembly (33) comprises an air guide plate (331) and wind shields (332) arranged on both sides of the air guide plate (331) to form an air outlet; one end of the air guide plate (331) is connected to the air supply cylinder (31), and the air guide plate (331) is provided with an inner curved surface (333) extending along a preset curve, so that the airflow of the air outlet is discharged in a curved manner; The air supply cylinder (31) comprises an upper plate (311), and two opposite expansion plates (312) and two opposite air confinement plates (313) are provided on the side of the upper plate (311), and the distance between the two air confinement plates (313) is set to be the thickness of the hollow cavity; The two expansion plates (312) are arranged to gradually extend outwards from top to bottom, and the cross-sectional area of ​​the hollow cavity is arranged to gradually decrease from top to bottom; The tensioning mechanism (20) further includes a lifting assembly (50) disposed between the first tensioning roller (21) and the second tensioning roller (22), the lifting assembly (50) including a crossbeam (51) fixed to a frame, a first driving member (52) being provided on an upper end face of the crossbeam (51), a driving end of the first driving member (52) being connected to a first base (53), the second tensioning roller (22) being rotatably connected to the first base (53), and the first driving member (52) being used to adjust a distance between the first tensioning roller (21) and the second tensioning roller (22).

2. The cooling device for PCR material drawing according to claim 1, characterized in that: The number of the tensioning mechanisms (20) is two groups, and the two groups of tensioning mechanisms (20) are arranged side by side along the conveying direction of the conveying mechanism (10); A spacing space is provided between the two groups of the tensioning mechanisms (20), at least one group of the blower mechanisms (30) is accommodated in the spacing space, and another group of blower mechanisms (30) is provided on at least one outward side of the tensioning mechanism (20).

3. The cooling device for PCR material drawing according to claim 2, characterized in that: A plurality of groups of tensioning roller assemblies (40) are further provided above the conveying mechanism (10), and the plurality of groups of tensioning roller assemblies (40) are respectively provided on both sides of the tensioning mechanism (20); The tension roller assembly (40) comprises a tension roller body (41) disposed transversely through the conveying mechanism (10), and a height adjustment member (42) is disposed on both sides of the tension roller body (41); The height adjustment member (42) is provided with an adjustment groove (421) and an adjustment bolt (422); one end of the tension roller body (41) is slidably connected to the adjustment groove (421); the adjustment bolt (422) is threadedly connected to the height adjustment member (42) and one end of the adjustment bolt is connected to the tension roller body (41); A compression spring (423) is sleeved on the adjusting bolt (422), and one end of the compression spring (423) is connected to one end of the tensioning roller body (41).

4. The cooling device for PCR material drawing according to claim 1, characterized in that: The tensioning mechanism (20) further comprises a conveyor belt (23) which is sleeved on the outside of the first tensioning roller (21) and the second tensioning roller (22), and the conveyor belt (23) is used to drive the wire material to move.

5. The cooling device for PCR material drawing according to claim 4, characterized in that: The first tensioning roller (21) comprises a main roller (211) and an intermediate shaft (212) provided through the main roller (211), wherein the intermediate shaft (212) is rotatably connected to the main roller (211) via a bearing; One end of the body roller (211) is connected to a first pulley (213) via a connecting seat, the first pulley (213) is connected to a second driving member (214), and the second driving member (214) is used to drive the first pulley (213) to rotate.

6. The cooling device for PCR material drawing according to claim 5, characterized in that: An eccentric rod (215) is provided at one end of the main roller (211), a connecting plate (216) is provided at one end of the crossbeam (51), one end of the eccentric rod (215) is rotatably connected to the connecting plate (216), and a swing rod (217) is provided passing through the connecting plate (216); A third driving member (218) is further provided on the connecting plate (216), and a connecting rod (219) is provided at a driving end of the third driving member (218). A rotating joint is provided at one end of the connecting rod (219), and one end of the swinging rod (217) is rotatably connected to the connecting rod (219) via the rotating joint. The third driving member (218) operates to drive the swinging rod (217) to drive the main body roller (211) to perform eccentric swinging.

7. The cooling device for PCR material drawing according to claim 1, characterized in that: The conveying mechanism (10) comprises a conveying belt assembly (11), and a fourth driving member (12) for driving the conveying belt assembly (11) to rotate; A plurality of leveling assemblies (13) are provided on the peripheral side of the conveyor belt assembly (11), and the leveling assemblies (13) are connected via connecting shafts (14).

8. The cooling device for PCR material drawing according to claim 7, characterized in that: The leveling assembly (13) includes an elevator (131), a screw rod (132) is provided at a driving end of the elevator (131), a connecting end cover (133) is provided at the top end of the screw rod (132), a rotating hole is provided at the top end of the connecting end cover (133), a push rod (134) is rotatably connected in the rotating hole, and one end of the push rod (134) is connected to the conveyor belt assembly (11).

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