A cooling device for preparing plastic particles

Abstract

The present application discloses a cooling device for preparing plastic particles, which includes a bottom plate, a first blanking unit, a second blanking unit, a first mounting frame, and a plurality of air-cooling units; the first blanking unit includes a first material receiving part, a first vibration unit, and a plurality of first support legs, and a first spring is connected between the first support legs and the first material receiving part; the second blanking unit includes a second material receiving part, a second vibration unit, and a plurality of second support legs, and a second spring is connected between the second support legs and the bottom plate. In the cooling device of the present application, the plastic particles slide down while jittering on the material receiving part, so that the plastic particles can slide down while jittering, so that different angles of the particles can face upward, and under the blowing effect of the blowing unit, a better cooling effect can be produced on the plastic particles. For different types of plastic particles, a double-trip cooling mode or a single-trip cooling mode can be adopted to meet the production needs of different types of plastic particles.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic particle preparation, and more specifically, to a cooling device for plastic particle preparation. Background Art

[0002] During the plastic granulation process, an extruder is usually equipped with a cooling system, which quickly cools the high-temperature plastic melt extruded from the melting extruder to the normal temperature range to ensure the quality and shape of the plastic particles.

[0003] For traditional cooling methods, some choose water cooling, but a large amount of water often adheres to the surface of the plastic particles after cooling, and operations such as water removal and drying are required, thus increasing the steps and reducing the overall production efficiency. In addition, for plastic particles of different specifications, their particle sizes and heating temperatures during extrusion and pelletizing are different, so the requirements for cooling speed and cooling effect are also different. However, existing cooling devices often have difficulty adjusting and selecting between cooling speed and cooling effect according to different particle specifications and heating temperatures, resulting in unsatisfactory cooling effects or overly long cooling steps. Summary of the Invention

[0004] The present invention aims to overcome the defects of the prior art and provides a cooling device for plastic particle preparation.

[0005] To achieve the above object, the present invention provides the following technical solution: A cooling device for plastic particle preparation, including a bottom plate, a first blanking unit, a second blanking unit, a first mounting rack, and a plurality of air-cooling units mounted on the first mounting rack; the first blanking unit includes a first material receiving portion, a first vibration unit mounted on the first material receiving portion, and a plurality of first support legs fixed to the bottom plate, and a first spring is connected between the first support legs and the first material receiving portion; the second blanking unit includes a second material receiving portion located below the first material receiving portion, a second vibration unit mounted on the second material receiving portion, and a plurality of second support legs fixedly connected to the second material receiving portion, and a second spring is connected between the second support legs and the bottom plate.

[0006] Thus, the first material receiving unit and the second material receiving unit can continuously vibrate under the vibration of the first vibration unit and the second vibration unit, so that the plastic particles slide down while vibrating, and thus the cooling effect is better under the air cooling of the air-cooling unit.

[0007] In some embodiments, it further includes a second mounting rack, and a relay unit is mounted at the second mounting rack. The relay unit includes a third material receiving portion, and the third material receiving portion is located between the first material receiving portion and the second material receiving portion; one end of the first material receiving portion away from the relay unit is higher than the end close to the relay unit, and one end of the second material receiving portion away from the relay unit is lower than the end close to the relay unit.

[0008] In some embodiments, the inclination angle of the first material receiving unit is between 2 and 10 degrees.

[0009] In some embodiments, the inclination angle of the second material receiving unit is between 2 and 10 degrees.

[0010] In some embodiments, the relay unit further includes a vertical rotating shaft fixedly connected to the third material receiving portion, and the vertical rotating shaft is installed at the second mounting bracket; the air cooling unit includes a mounting rotating shaft installed on the first mounting bracket, a connecting frame fixedly connected to the mounting rotating shaft, and two blowing units installed on the connecting frame.

[0011] In some embodiments, there is a bearing between the vertical rotating shaft and the second mounting bracket.

[0012] In some embodiments, there is a bearing between the mounting rotating shaft and the first mounting bracket.

[0013] In some embodiments, a gear is installed at the vertical rotating shaft, two side frames are fixed to the bottom plate, a horizontal rotating shaft is installed between the two side frames, a gear shaft meshing with the gear is installed at the horizontal rotating shaft, and a plurality of driving sprockets are also installed at the horizontal rotating shaft; the air cooling unit further includes a driven sprocket installed at the mounting rotating shaft, the number of driving sprockets is equal to the number of air cooling units and they correspond one by one, a chain is connected between the corresponding driving sprocket and the driven sprocket, the connecting frame includes a first L-shaped frame and a second L-shaped frame connected to each other, and the two blowing units are respectively fixedly connected to the first L-shaped frame and the second L-shaped frame. The blowing unit includes a rectangular frame portion, a mounting ring portion located inside the rectangular frame portion, a limiting ring portion fixed to the mounting ring portion, and a fan unit fixedly connected to the mounting ring portion through a plurality of connecting plates. A first counterweight is fixed to the mounting ring portion, and a plurality of limiting units are fixed to the rectangular frame portion. The limiting unit includes two limiting plates, the limiting ring portion is located between the two limiting plates, and the limiting plate has an arc surface matching the mounting ring portion; a driving turntable is installed at the end of the horizontal rotating shaft, a handle is installed at the driving turntable, and a locking bolt capable of locking the relative positions of the driving turntable and the side frame close to the driving turntable is also provided at the driving turntable.

[0014] In some embodiments, the angle between the axis of rotation of the fan unit and the horizontal plane is between 5 and 30 degrees.

[0015] Thus, under the action of the first counterweight, the mounting ring portion can rotate within the rectangular frame portion, so as to ensure that the first counterweight is always in a lower position, so that the fan unit can blow air obliquely downward.

[0016] In some embodiments, bearings are installed between the horizontal rotating shaft and the two side frames.

[0017] In some embodiments, the cooling device can be in a double-stroke cooling state and a single-stroke cooling state. In the double-stroke cooling state, the two blowing units of all the air-cooling units are vertically distributed up and down, and the third material receiving part is used to receive the material falling from the first material receiving part and drop the material to the second material receiving part; in the single-stroke cooling state, the two blowing units of all the air-cooling units are horizontally distributed left and right and are all used to blow the material on the first material receiving part, and the third material receiving part is used to receive the material falling from the first material receiving part and does not drop the material to the second material receiving part.

[0018] In some embodiments, when switching from the double-stroke cooling state to the single-stroke cooling state, all the air-cooling units rotate by 90 degrees, and the relay unit rotates by 180 degrees.

[0019] In some embodiments, the gear can be replaced by a first bevel gear, and the tooth shaft can be replaced by a second bevel gear meshing with the first bevel gear.

[0020] Thus, the rotation of the horizontal rotating shaft can be transmitted to the vertical rotating shaft to drive the vertical rotating shaft to rotate.

[0021] In some embodiments, in the double-stroke cooling state, the blowing unit above the air-cooling unit is farther away from the first mounting bracket than the blowing unit below.

[0022] In some embodiments, the top end of the mounting ring part has an abutting plane; at the first mounting bracket, there are a first vertical guide hole and a second vertical guide hole. A tightening and reinforcement unit is installed at the first mounting bracket. The tightening and reinforcement unit includes an L-shaped first guide rod that cooperates with the first vertical guide hole, an L-shaped second guide rod that cooperates with the second vertical guide hole, a horizontal lifting rod connected to both the first guide rod and the second guide rod, and an abutting rod located below the lifting rod. The abutting rod has a plurality of limiting guide rods, the end of the limiting guide rod has an end stop block, the lifting rod has a limiting guide hole that cooperates with the limiting guide rod, a third spring is sleeved on the limiting guide rod between the lifting rod and the abutting rod, a wire reel is installed on the horizontal rotating shaft, second counterweight blocks are installed at the bottom ends of both the first guide rod and the second guide rod, a connecting rod is connected to the second counterweight block on the first guide rod, and a pulling rope is connected between the connecting rod and the wire reel.

[0023] In some embodiments, the pulling rope is an elastic rope.

[0024] Thus, the pulling rope can provide elastic force, thereby increasing the tightening effect on the blowing unit, and when switching between the two cooling states, the elastic rope can also provide a better switching space.

[0025] In some embodiments, in the double-stroke cooling state, the abutting rod abuts against the abutting plane of the mounting ring portion of the blowing unit above all the air-cooling units; in the single-stroke cooling state, the abutting rod abuts against the abutting planes of the mounting ring portions of the two blowing units of all the air-cooling units.

[0026] In some embodiments, a rubber pad is installed at the abutting rod, and the rubber pad has a plurality of rubber protrusions.

[0027] Thus, the abutting and fixing effect of the abutting rod on the blowing unit is better.

[0028] In some embodiments, the connecting rod includes an arc rod connected to the second counterweight block and a straight rod connected to the arc rod. A wire passing hole is provided at the straight rod, and the end of the elastic rope is fixedly connected to the wire passing hole.

[0029] In some embodiments, both the first mounting frame and the second mounting frame are in an inverted U shape.

[0030] In some embodiments, the cross-sections of both the first material receiving portion and the second material receiving portion are in a U shape.

[0031] In some embodiments, both the first material receiving portion and the second material receiving portion include a material receiving plate body and two baffle plate bodies fixedly connected to the material receiving plate body.

[0032] In some embodiments, the number of both the first vibration unit and the second vibration unit is greater than or equal to two.

[0033] In some embodiments, the third material receiving portion includes a material receiving plate and two side baffles fixedly connected to the material receiving plate. The side baffles include a first side plate, a second side plate, and a connecting side plate connecting the first side plate and the second side plate. The two first side plates are parallel to each other, the two second side plates are parallel to each other, and the distance between the two first side plates is less than the distance between the two second side plates.

[0034] In some embodiments, the width of the first material receiving unit is equal to the width of the second material receiving unit.

[0035] In some embodiments, the distance between the two second side plates is greater than the width of the first material receiving unit; the distance between the two first side plates is less than the width of the second material receiving unit.

[0036] Thus, it is ensured that the third material receiving unit completely receives the materials falling from the first material receiving unit.

[0037] In some embodiments, the number of the air-cooling units is 3 - 5.

[0038] In some embodiments, the air-cooling units are distributed in a row at equal intervals.

[0039] Beneficial effects:

[0040] 1. For the cooling device of the present application, the plastic particles slide down while jittering at the material receiving part, so that the plastic particles can slide down while jittering, and thus different angles of the particles can face upward. Under the blowing effect of the blowing unit, a better cooling effect is produced on the plastic particles.

[0041] 2. For the cooling device of the present application, for different types of plastic particles, a double - stroke cooling mode or a single - stroke cooling mode can be adopted to meet the production needs of different types of plastic particles. Description of the Drawings

[0042] Figure 1 Schematic diagram of the cooling device in the double - stroke cooling state in Embodiment 1;

[0043] Figure 2 Enlarged view of Area 1A;

[0044] Figure 3 Enlarged view of Area 1B;

[0045] Figure 4 Schematic diagram of the cooling device in the single - stroke cooling state in Embodiment 1;

[0046] Figure 5 Enlarged view of Area 2A;

[0047] Figure 6 Another - angle schematic diagram of the cooling device in the single - stroke cooling state in Embodiment 1;

[0048] Figure 7 Enlarged view of Area 3A;

[0049] Figure 8 Schematic diagram of the cooling device in the double - stroke cooling state in Embodiment 2;

[0050] Figure 9 Enlarged view of Area 4A;

[0051] Figure 10 Enlarged view of Area 4B;

[0052] Figure 11 Schematic diagram of the cooling device in the single - stroke cooling state in Embodiment 2;

[0053] Figure 12 Enlarged view of Area 5A;

[0054] Figure 13 Enlarged view of Area 5B;

[0055] Figure 14 Another - angle schematic diagram of the cooling device in the single - stroke cooling state in Embodiment 2;

[0056] Figure 15It is an enlarged view of area 6A;

[0057] Figure 16 It is an enlarged view of area 5B.

[0058] Description of reference numerals in the drawings: bottom plate 1; first material receiving part 2-1; first vibration unit 2-2; first support leg 2-3; first spring 2-4; second material receiving part 3-1; second vibration unit 3-2; second support leg 3-3; second spring 3-4; first mounting bracket 4; second mounting bracket 5; third material receiving part 6-1; material receiving plate 6-1-1; first side plate 6-1-2; connecting side plate 6-1-3; second side plate 6-1-4; vertical rotating shaft 6-2; gear 6-3; mounting rotating shaft 7-1; connecting frame 7-2; first L-shaped frame 7-2-1; second L-shaped frame 7-2-2; passive sprocket 7-3; side frame 8-1; horizontal rotating shaft 8-2; tooth shaft 8-3; active sprocket 8-4; chain 8-5; driving turntable 8-6; handle 8-6-1; locking bolt 8-6-2; rectangular frame part 9-1; mounting ring part 9-2; abutting plane 9-2-1; limiting ring part 9-3; connecting plate 9-4; fan unit 9-5; first counterweight 9-6; limiting plate 9-7; first guide rod 10-1; second guide rod 10-2; lifting rod 10-3; abutting rod 10-4; limiting guide rod 10-5; end stop 10-6; third spring 10-7; second counterweight 10-8; wire reel 11; elastic cord 11-1; connecting rod 12; wire passing hole 12-1. Detailed implementation manners

[0059] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention and should not be construed as a limitation to the present invention.

[0060] Embodiment 1

[0061] As shown in the figure, a cooling device for preparing plastic particles includes a bottom plate 1, a first blanking unit, a second blanking unit, a first mounting frame 4, and a plurality of air-cooling units mounted on the first mounting frame 4; the first blanking unit includes a first material receiving part 2-1, a first vibration unit 2-2 mounted on the first material receiving part 2-1, and a plurality of first support legs 2-3 fixed to the bottom plate 1, and a first spring 2-4 is connected between the first support legs 2-3 and the first material receiving part 2-1; the second blanking unit includes a second material receiving part 3-1 located below the first material receiving part 2-1, a second vibration unit 3-2 mounted on the second material receiving part 3-1, and a plurality of second support legs 3-3 fixedly connected to the second material receiving part 3-1, and a second spring 3-4 is connected between the second support legs 3-3 and the bottom plate 1. The cooling device further includes a second mounting frame 5, and a relay unit is mounted at the second mounting frame 5, and the relay unit includes a third material receiving part 6-1, and the third material receiving part 6-1 is located between the first material receiving part 2-1 and the second material receiving part 3-1; one end of the first material receiving part 2-1 away from the relay unit is higher than the end close to the relay unit, and one end of the second material receiving part 3-1 away from the relay unit is lower than the end close to the relay unit. The relay unit further includes a vertical rotating shaft 6-2 fixedly connected to the third material receiving part 6-1, and the vertical rotating shaft 6-2 is mounted at the second mounting frame 5; the air-cooling unit includes a mounting rotating shaft 7-1 mounted on the first mounting frame 4, a connecting frame 7-2 fixedly connected to the mounting rotating shaft 7-1, and two blowing units mounted on the connecting frame 7-2.

[0062] A gear 6-3 is installed at the vertical rotating shaft 6-2. Two side frames 8-1 are fixed to the bottom plate 1. A horizontal rotating shaft 8-2 is installed between the two side frames 8-1. A gear shaft 8-3 meshing with the gear 6-3 is installed at the horizontal rotating shaft 8-2. A plurality of driving sprockets 8-4 are also installed at the horizontal rotating shaft 8-2. The air-cooling unit further includes a driven sprocket 7-3 installed at the installation rotating shaft 7-1. The number of the driving sprockets 8-4 is equal to the number of the air-cooling units and they correspond to each other one by one. A chain 8-5 is connected between the corresponding driving sprocket 8-4 and driven sprocket 7-3. The connecting frame 7-2 includes a first L-shaped frame 7-2-1 and a second L-shaped frame 7-2-2 which are connected to each other. Two blowing units are respectively fixedly connected to the first L-shaped frame and the second L-shaped frame. The blowing unit includes a rectangular frame part 9-1, an installation ring part 9-2 located inside the rectangular frame part 9-1, a limiting ring part 9-3 fixed to the installation ring part 9-2, and a fan unit 9-5 fixedly connected to the installation ring part 9-2 through a plurality of connecting plates 9-4. A first counterweight 9-6 is fixed to the installation ring part 9-2. A plurality of limiting units are fixed to the rectangular frame part 9-1. The limiting unit includes two limiting plates 9-7. The limiting ring part 9-3 is located between the two limiting plates 9-7. The limiting plate has an arc surface matching with the installation ring part 9-2. The rotation axis of the fan unit forms an angle between 5 and 30 degrees with the horizontal plane. A driving turntable 8-6 is installed at the end of the horizontal rotating shaft 8-2. A handle 8-6-1 is installed at the driving turntable. A locking bolt 8-6-2 capable of locking the relative positions of the driving turntable 8-6 and the side frame 8-1 close to the driving turntable is also provided at the driving turntable. The cooling device can be in a double-trip cooling state and a single-trip cooling state. In the double-trip cooling state, the two blowing units of all the air-cooling units are vertically distributed up and down. The third material receiving part 6-1 is used to receive the material falling from the first material receiving part 2-1 and drop the material to the second material receiving part 3-1. In the single-trip cooling state, the two blowing units of all the air-cooling units are horizontally distributed left and right and are all used to blow the material of the first material receiving part 2-1. The third material receiving part 6-1 is used to receive the material falling from the first material receiving part 2-1 and does not drop the material to the second material receiving part 3-1. When switching from the double-trip cooling state to the single-trip cooling state, all the air-cooling units rotate by 90 degrees and the relay unit rotates by 180 degrees. In the double-trip cooling state, the upper blowing unit of the air-cooling unit is farther away from the first mounting frame 4 than the lower blowing unit.

[0063] The first mounting bracket 4 and the second mounting bracket 5 are both in an inverted U shape. The cross-sections of the first material receiving part 2-1 and the second material receiving part 3-1 are both in a U shape; the numbers of the first vibration unit 2-2 and the second vibration unit 3-2 are both greater than or equal to two. The third material receiving part 6-1 includes a material receiving plate 6-1-1 and two side baffles fixedly connected to the material receiving plate. The side baffles include a first side plate 6-1-2, a second side plate 6-1-4, and a connecting side plate 6-1-3 connecting the first side plate and the second side plate. The two first side plates are parallel to each other, the two second side plates are parallel to each other, and the distance between the two first side plates is less than the distance between the two second side plates. The number of the air cooling units is 3-5.

[0064] Working principle: As shown in the figure, for the plastic particle cooling device of the present application, the plastic particles produced by the upstream equipment will fall on the higher end of the first material receiving part, and with the vibration generated by the first vibration unit, the first material receiving part will produce continuous jitter. As a result, under the effect of the jitter, the plastic particles will slowly fall along the first material receiving part and even produce small jumps. Thus, during the falling process of the particles, different surfaces will alternately face upward, and a good cooling effect can be achieved under the blowing effect of the blowing unit. When using the double-trip cooling state, as Figure 1 shown, the particles falling from the first material receiving part will fall onto the third material receiving part and then be discharged along the third material receiving part to the second material receiving part. The second material receiving part will also continuously jitter under the drive of the second vibration unit. The particles are cooled by blowing while falling in the second material receiving part and finally are discharged from the lower end of the second material receiving part and enter the downstream process. When using the single-trip cooling state, as Figure 4 、 6As shown, the particles fall from the first material receiving part to the third material receiving part and directly fall from the third material receiving part to the downstream process. Actually, the second material receiving part is not used and the second vibration unit is in the off state. For the double-trip cooling state and the single-trip cooling state, as shown in the figure, only need to loosen the locking bolt, rotate the drive disk through the handle, so that the horizontal rotating shaft rotates, and then drive the air-cooling unit to rotate through the chain, and drive the third material receiving part to rotate as well. And the gear ratio is set such that when the air-cooling unit rotates 90 degrees, the third material receiving part rotates 180 degrees. And when the air-cooling unit rotates 90 degrees, it needs the drive disk to rotate multiple circles, so that the rotation of the drive disk is more labor-saving. After the state adjustment is completed, the locking bolt can be locked, so that the positions of the air-cooling unit and the third material receiving part are fixed, and then the corresponding cooling can be carried out. According to different specifications of plastic particles and the temperature during particle extrusion and pelletizing, different cooling states can be selected. For particles with smaller particle size and lower extrusion temperature, the single-trip cooling state can be adopted to reduce the travel of the particles in the cooling step, thereby improving the cooling efficiency and further improving the overall production efficiency. For plastic particles with larger particle size and higher extrusion temperature, the double-trip cooling state can be adopted, so that the particles go through more travels, so that the cooling time of the particles is longer and the cooling effect is better.

[0065] Example 2

[0066] Embodiment 2 further adds a pressing and reinforcing unit on the basis of Embodiment 1. Specifically: the top of the mounting ring portion has a contact plane 9-2-1; the first mounting bracket has a first vertical guide hole and a second vertical guide hole. A pressing and reinforcing unit is installed at the first mounting bracket. The pressing and reinforcing unit includes an L-shaped first guide rod 10-1 that cooperates with the first vertical guide hole, an L-shaped second guide rod 10-2 that cooperates with the second vertical guide hole, a horizontal lifting rod 10-3 connected to both the first guide rod 10-1 and the second guide rod 10-2, and a contact rod 10-4 located below the lifting rod. The contact rod has a plurality of limiting guide rods 10-5, and the end of the limiting guide rod has an end stop 10-6. The lifting rod has a limiting guide hole that cooperates with the limiting guide rod. A third spring 10-7 is sleeved on the limiting guide rod and is located between the lifting rod and the contact rod. A wire reel 11 is installed on the horizontal rotating shaft. Second counterweights 10-8 are installed at the bottom ends of both the first guide rod 10-1 and the second guide rod 10-2. The second counterweight at the first guide rod 10-1 is connected to a connecting rod 12, and an elastic rope 11-1 is connected between the connecting rod and the wire reel; in the double-stroke cooling state, the contact rod abuts against the contact plane of the mounting ring portion of the blowing unit above all the air-cooling units; in the single-stroke cooling state, the contact rod abuts against the contact planes of the mounting ring portions of the two blowing units of all the air-cooling units. The connecting rod includes an arc-shaped rod connected to the second counterweight and a straight rod connected to the arc-shaped rod. The straight rod has a wire passing hole 12-1, and the end of the elastic rope is fixedly connected to the wire passing hole.

[0067] Working principle: As Figures 8 - 14 shown, the pressing and reinforcing unit can make the contact rod abut against the contact plane of the mounting ring portion whether in the double-stroke cooling state or the single-stroke cooling state, so that each blowing unit is more stable and avoids shaking during blowing due to the position of the blowing unit not being locked. And because the wire reel and the elastic rope are provided, when using the handle to switch the cooling state, the height of the lifting rod can rise and fall under the action of gravity, ensuring that the contact rod can abut against the contact plane of the mounting ring portion that needs to be abutted. And when switching from the double-stroke cooling state to the single-stroke cooling state, the length of the elastic rope outside the wire reel is shortened, so that the length of the elastic rope outside the wire reel is more appropriate, maintaining an appropriate elastic force, so that the contact rod can better abut against the contact plane of the mounting ring portion and realize pressing and fixing of the position of the blowing unit.

[0068] Although the present invention has been illustrated and described with respect to the preferred embodiments, those skilled in the art should understand that various changes and modifications can be made to the present invention as long as they do not exceed the scope defined by the claims of the present invention.

Claims

1. A cooling device for preparing plastic particles, characterized in that: It includes a bottom plate, a first blanking unit, a second blanking unit, a first mounting frame, and a plurality of air-cooling units mounted on the first mounting frame; the first blanking unit includes a first material receiving portion, a first vibration unit mounted on the first material receiving portion, and a plurality of first support legs fixed to the bottom plate, and a first spring is connected between the first support leg and the first material receiving portion; the second blanking unit includes a second material receiving portion located below the first material receiving portion, a second vibration unit mounted on the second material receiving portion, and a plurality of second support legs fixedly connected to the second material receiving portion, and a second spring is connected between the second support leg and the bottom plate; The cooling device for preparing plastic particles also includes a second mounting frame, a relay unit is installed at the second mounting frame, and the relay unit includes a third material receiving portion, and the third material receiving portion is located between the first material receiving portion and the second material receiving portion; an end of the first material receiving portion away from the relay unit is higher than an end close to the relay unit, and an end of the second material receiving portion away from the relay unit is lower than an end close to the relay unit; The relay unit further comprises a vertical rotating shaft fixedly connected to the third material receiving portion, and the vertical rotating shaft is installed at the second mounting frame; the air cooling unit comprises a mounting rotating shaft installed on the first mounting frame, a connecting frame fixedly connected to the mounting rotating shaft, and two blowing units installed on the connecting frame; A gear is installed at the vertical rotating shaft, two side frames are fixed at the bottom plate, a horizontal rotating shaft is installed between the two side frames, a gear shaft meshing with the gear is installed at the horizontal rotating shaft, and a plurality of driving sprockets are also installed at the horizontal rotating shaft; the air cooling unit also includes a passive sprocket installed at the mounting rotating shaft, the number of the driving sprockets is equal to the number of the air cooling units and the two correspond one to one, and a chain is connected between the corresponding driving sprockets and the passive sprockets, the connecting frame includes a first L-shaped frame and a second L-shaped frame connected to each other, and the two blowing units are fixedly connected to the first L-shaped frame and the second L-shaped frame respectively, the blowing unit includes a rectangular frame portion, a mounting ring portion located in the rectangular frame portion, a limiting ring portion fixed to the mounting ring portion, and a fan unit fixedly connected to the mounting ring portion through a plurality of connecting plates, the mounting ring portion is fixed with a first counterweight block, and a plurality of limiting units are fixed at the rectangular frame portion, the limiting unit includes two limiting plates, the limiting ring portion is located between the two limiting plates, and the limiting plate has a matching The arc surface is combined, and the angle between the axis of rotation of the fan unit and the horizontal plane is between 5 and 30 degrees; a driving turntable is installed at the end of the horizontal shaft, and a handle is installed at the driving turntable, and the driving turntable also has a locking bolt that can lock the relative position of the driving turntable and the side frame close to the driving turntable; the cooling device can be in a double-stroke cooling state and a single-stroke cooling state. In the double-stroke cooling state, the two blowing units of all air-cooling units are in a vertical up and down distribution, and the third material receiving part is used to receive the material falling from the first material receiving part and drop it to the second material receiving part; in the single-stroke cooling state, the two blowing units of all air-cooling units are horizontally distributed left and right and are both used to blow air to the material of the first material receiving part, and the third material receiving part is used to receive the material falling from the first material receiving part and not drop it to the second material receiving part; when switching from the double-stroke cooling state to the single-stroke cooling state, all air-cooling units rotate 90 degrees, and the relay unit rotates 180 degrees.

2. The cooling device for preparing plastic particles according to claim 1, characterized in that: The top of the mounting ring portion has an abutment plane; the first mounting frame has a first vertical guide hole and a second vertical guide hole, and a tightening reinforcement unit is installed on the first mounting frame, and the tightening reinforcement unit includes an L-shaped first guide rod matched with the first vertical guide hole, an L-shaped second guide rod matched with the second vertical guide hole, a horizontal lifting rod connected to the first guide rod and the second guide rod, and an abutment rod located below the lifting rod, the abutment rod has a plurality of limiting guide rods, the ends of the limiting guide rods have end blocks, and the lifting rods have a limiting guide rod matched with the limiting guide rods. The guide hole is provided with a third spring located between the lifting rod and the abutment rod at the limiting guide rod, a take-up wheel is installed at the horizontal rotating shaft, second counterweight blocks are installed at the bottom ends of the first guide rod and the second guide rod, the second counterweight block at the first guide rod is connected with a connecting rod, and an elastic rope is connected between the connecting rod and the take-up wheel; in the double-stroke cooling state, the abutment rod abuts against the abutment plane of the mounting ring of the blowing unit above all the air-cooling units; in the single-stroke cooling state, the abutment rod abuts against the abutment planes of the mounting rings of the two blowing units of all the air-cooling units.

3. The cooling device for preparing plastic particles according to claim 2, characterized in that: The connecting rod comprises an arc rod connected to the second counterweight block and a straight rod connected to the arc rod. The straight rod is provided with a threading hole, and the end of the elastic rope is fixedly connected to the threading hole.

4. The cooling device for preparing plastic particles according to claim 1, characterized in that: The first mounting frame and the second mounting frame are both in an inverted U shape.

5. The cooling device for preparing plastic particles according to claim 1, characterized in that: The cross-sections of the first material receiving portion and the second material receiving portion are both U-shaped; the number of the first vibration unit and the second vibration unit is both greater than or equal to two.

6. The cooling device for preparing plastic particles according to claim 1, characterized in that: The third material receiving part includes a material receiving plate and two side baffles fixedly connected to the material receiving plate, the side baffles include a first side plate, a second side plate and a connecting side plate connecting the first side plate and the second side plate, the two first side plates are parallel to each other, the two second side plates are parallel to each other, and the spacing between the two first side plates is smaller than the spacing between the two second side plates.

7. The cooling device for preparing plastic particles according to claim 1, characterized in that: The number of the air cooling units is 3-5.

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