A cooling and shaping device for injection molding of air conditioner swing blades

Abstract

The present invention discloses a cooling and shaping device for an air-conditioning air-sweeping blade during injection molding, which relates to the technical field of plastic parts of air conditioners. The device includes a working platform, a displacement mechanism, a softening mechanism and a shaping mechanism. The working platform is horizontally arranged. The displacement mechanism is located above the working platform and is used to adjust the spatial position and spatial attitude of the air-conditioning air-sweeping blade. The displacement mechanism includes a rodless cylinder, a first hydraulic cylinder and a positioning tube. The softening mechanism is located in the middle of the working platform and heats and softens the air-conditioning air-sweeping blade through hot air. The softening mechanism includes a first heat preservation bin, a first support column, a first heat preservation sheet, a second hydraulic cylinder and a heating strip. The shaping mechanism is located at the back of the working platform and cools and shapes the softened air-conditioning air-sweeping blade through cold air. The shaping mechanism includes a second heat preservation bin, a second support column, a second heat preservation sheet, a third hydraulic cylinder and a cooling tube. The present invention heats and softens the air-conditioning air-sweeping blade to be corrected through hot air, and cools and shapes the softened air-conditioning air-sweeping blade through cold air.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic parts for air conditioners, and particularly to a cooling and shaping device for injection molding of air conditioner swing blades. Background Art

[0002] At present, the swing blades in air conditioners are produced by injection molding technology. After the swing blades are cooled and shaped, subsequent assembly is carried out.

[0003] Since the swing blades in air conditioners are relatively thin, they are taken out of the mold by a robotic arm before being completely cooled and shaped, and released onto a conveyor belt for air cooling while being conveyed. During this period, since the swing blades are no longer restricted by the molding cavity of the mold, and the mass of the swing blades is concentrated, the petiole part of the swing blades is prone to skew, affecting the actual swing effect of the air conditioner. If forced to be straightened, the connection strength of the swing blades will be affected, and they will return to the skew state subsequently. At present, for such defective products, they can only be crushed and mixed into the raw materials for reuse. Summary of the Invention

[0004] The purpose of the present invention is to provide a cooling and shaping device for injection molding of air conditioner swing blades to solve the above-mentioned defects in the prior art.

[0005] A cooling and shaping device for injection molding of air conditioner swing blades includes a working platform, a displacement mechanism, a softening mechanism and a shaping mechanism, wherein:

[0006] The working platform is horizontally arranged;

[0007] The displacement mechanism is located above the working platform and is used to adjust the spatial position and spatial attitude of the air conditioner swing blades;

[0008] The softening mechanism is located in the middle of the working platform and heats and softens the air conditioner swing blades through hot air;

[0009] The shaping mechanism is located at the back of the working platform and cools and shapes the softened air conditioner swing blades through cold air.

[0010] Preferably, the displacement mechanism includes a rodless cylinder, a first hydraulic cylinder, and a positioning tube. The rodless cylinder is arranged in the front-back direction and is mounted on the upper side of the working platform through a pair of fixing plates. A moving plate is horizontally connected to the upper side of the pneumatic slider of the rodless cylinder. There are a pair of the first hydraulic cylinders, which are symmetrically distributed left and right. The first hydraulic cylinders are arranged vertically upward and are connected to the front side of the moving plate. Rectangular avoidance grooves are symmetrically arranged on the left and right sides of the working platform on both sides of the rodless cylinder. The first hydraulic cylinders on the same side are slidably arranged in the avoidance grooves. The ends of the piston rods of the two first hydraulic cylinders are both connected with a first hinge seat. A "┏"-shaped first hinge bar is hinged on each of the first hinge seats. The moving plate is connected with a second hinge seat behind the two first hydraulic cylinders. A "┃"-shaped second hinge bar is hinged on each of the second hinge seats. The other end of the first hinge bar on the same side is connected to the other end of the second hinge bar. The positioning tube is horizontally connected to the front side of the two first hinge bars. A rectangular positioning opening is arranged in the middle of the positioning tube. Rectangular positioning grooves are symmetrically arranged on the left and right sides of the positioning opening. Triangular positioning blocks are arranged at the inner ends of the positioning grooves. Circular suction holes are evenly distributed at the bottom of the positioning grooves. Suction pipes are connected to both the left and right ends of the positioning tube. The suction pipes are connected to an external negative pressure air source. "√"-shaped limiting strips are evenly connected to the lower side of the positioning tube. Rectangular limiting grooves are arranged at the lower ends of the limiting strips.

[0011] Preferably, the softening mechanism includes a first heat preservation bin, a first support column, a first heat preservation sheet, a second hydraulic cylinder, and a heating strip. A rectangular first inlet is arranged in the middle of the front side of the first heat preservation bin. Rectangular first inlet grooves are symmetrically arranged on the lower side of the first heat preservation bin. The first heat preservation bin is centrally connected to the upper side of the working platform through four first support columns. A number of first heat preservation sheets are evenly rotatably connected at the first inlet. There are a pair of the second hydraulic cylinders, which are symmetrically distributed left and right. The second hydraulic cylinders are arranged vertically downward and are connected to the upper side of the first heat preservation bin. The ends of the piston rods of the two second hydraulic cylinders are both connected with a first heat insulation frame. The heating strip is horizontally connected to the lower side of the two first heat insulation frames. A number of pairs of heating sheets are evenly distributed on the lower side of the heating strip. A pair of electric heating rods are inserted in parallel inside the heating strip.

[0012] Preferably, the shaping mechanism includes a second heat preservation bin, second support columns, second heat preservation sheets, a third hydraulic cylinder, and a cooling pipe. A rectangular second inlet is provided in the center of the front side of the second heat preservation bin. Rectangular second inlet grooves are symmetrically provided on the lower side of the second heat preservation bin. The second heat preservation bin is connected to the upper side of the working platform by four second support columns at the rear. A plurality of second heat preservation sheets are evenly rotatably connected at the second inlet. A pair of third hydraulic cylinders are provided and symmetrically distributed left and right. The third hydraulic cylinder is vertically downward and connected to the upper side of the second heat preservation bin. The ends of the piston rods of the two third hydraulic cylinders are both connected with a second heat insulation frame. The cooling pipe is horizontally connected to the lower sides of the two second heat insulation frames. Rectangular air outlet grooves are evenly distributed on the lower side of the cooling pipe. An air inlet pipe is connected to the upper side of the cooling pipe, and the air inlet pipe is connected to an external cold air source.

[0013] Preferably, a refrigeration component is installed in the center of the upper side of the second heat preservation bin. The refrigeration component includes a refrigeration sheet, a refrigeration plate, a refrigeration cover, a heat dissipation plate, a heat dissipation cover, and a heat insulation strip. The refrigeration sheet is vertically arranged above the second heat preservation bin. The heat dissipation plate and the refrigeration plate are respectively attached to the front and rear sides of the refrigeration sheet. The heat dissipation cover and the refrigeration cover are correspondingly installed on the outer sides of the heat dissipation plate and the refrigeration plate. An annular first air inlet is provided at the rear side of the refrigeration cover and a first air inlet fan is installed inside it. A circular first air outlet is provided on the upper side of the refrigeration cover and a "ㄥ"-shaped first air outlet pipe is connected to the outside of it. The other end of the first air outlet pipe is communicated with the other end of the air guide pipe. An annular second air inlet is provided on the front side of the heat dissipation cover and a second air inlet fan is installed inside it. A circular second air outlet is provided on the upper side of the heat dissipation cover and a "│"-shaped second air outlet pipe is connected to the outside of it. A pair of heat insulation strips are provided and symmetrically distributed on the left and right sides of the refrigeration sheet.

[0014] Compared with the prior art, the cooling and shaping device for the air-conditioning sweeping blade injection molding in the present invention has the following advantages:

[0015] 1. It can heat and soften the air-conditioning sweeping blade to be corrected by hot air. The piston rod of the first hydraulic cylinder extends to drive the positioning pipe and the air-conditioning sweeping blade to transfer into the first heat preservation bin. Then, the piston rod of the second hydraulic cylinder extends to drive the heating strip to descend and approach the air-conditioning sweeping blade. Then, the air-conditioning sweeping blade is heated and softened by the heating strip. After heating, the piston rod of the first hydraulic cylinder contracts to drive the positioning pipe and the air-conditioning sweeping blade to transfer out of the first heat preservation bin.

[0016] 2. The air-conditioning swing blade that can be cooled by cold air and shaped after softening. The piston rod of hydraulic cylinder 1 extends to drive the positioning pipe and the air-conditioning swing blade to move into insulation bin 2. Then, the piston rod of hydraulic cylinder 2 extends to drive the cooling pipe to descend and approach the air-conditioning swing blade. Next, cold air is ejected through the air outlet grooves on the cooling pipe to cool and shape the air-conditioning swing blade. After shaping, the piston rod of hydraulic cylinder 1 contracts to drive the positioning pipe and the air-conditioning swing blade to move out of insulation bin 2. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic three-dimensional structure diagram of the whole invention.

[0018] Figure 2 and Figure 3 It is a schematic structure diagram of the displacement mechanism in the invention.

[0019] Figure 4 and Figure 5 It is a schematic structure diagram of the softening mechanism in the invention.

[0020] Figure 6 and Figure 7 It is a schematic structure diagram of the shaping mechanism in the invention.

[0021] Figure 8 and Figure 9 It is a schematic structure diagram of the shaping mechanism in the invention.

[0022] Figure 10 It is a schematic structure diagram of the air-conditioning swing blade in the invention.

[0023] Wherein:

[0024] 10 - working platform; 10a - avoidance groove;

[0025] 20 - displacement mechanism; 201 - rodless cylinder; 202 - fixed plate; 203 - moving plate; 204 - hydraulic cylinder 1; 205 - hinge seat 1; 206 - hinge bar 1; 207 - hinge seat 2; 208 - hinge bar 2; 209 - positioning pipe; 209a - positioning port; 209b - positioning groove; 209c - positioning block; 209d - adsorption hole; 210 - suction pipe; 211 - limiting strip; 211a - limiting groove;

[0026] 30 - softening mechanism; 301 - insulation bin 1; 301a - inlet 1; 301b - inlet groove 1; 302 - support column 1; 303 - insulation sheet 1; 304 - hydraulic cylinder 2; 305 - heat insulation frame 1; 306 - heating strip; 307 - heating sheet; 308 - electric heating rod;

[0027] 40 - Shaping mechanism; 401 - Second heat preservation bin; 401a - Second inlet; 401b - Second inlet slot; 402 - Second support column; 403 - Second heat preservation sheet; 404 - Third hydraulic cylinder; 405 - Second heat insulation frame; 406 - Cooling pipe; 406a - Air outlet slot; 407 - Air duct; 408 - Refrigeration component; 4081 - Refrigeration sheet; 4082 - Refrigeration plate; 4083 - Refrigeration cover; 4083a - First air inlet; 4083b - First air outlet; 4084 - First intake fan; 4085 - First outlet pipe; 4086 - Heat dissipation plate; 4087 - Heat dissipation cover; 4087a - Second air inlet; 4087b - Second air outlet; 4088 - Second intake fan; 4089 - Second outlet pipe; 40810 - Heat insulation strip;

[0028] 50 - Air conditioner sweeping blade; 501 - Linking bar; 502 - Leafstalk; 503 - Blade. Specific embodiments

[0029] To make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0030] As Figures 1 to 10 shown, a cooling and shaping device for injection molding of air conditioner sweeping blades includes a working platform 10, a displacement mechanism 20, a softening mechanism 30 and a shaping mechanism 40, where:

[0031] The working platform 10 is horizontally arranged;

[0032] The displacement mechanism 20 is located above the working platform 10 and is used to adjust the spatial position and spatial attitude of the air conditioner sweeping blade 50;

[0033] The softening mechanism 30 is located in the middle of the working platform 10 and heats and softens the air conditioner sweeping blade 50 through hot air;

[0034] The shaping mechanism 40 is located behind the working platform 10 and cools and shapes the softened air conditioner sweeping blade 50 through cold air.

[0035] In this embodiment, the displacement mechanism 20 includes a rodless cylinder 201, a first hydraulic cylinder 204 and a positioning tube 209. The rodless cylinder 201 is arranged in the front-back direction and is installed on the upper side of the working platform 10 through a pair of fixing plates 202. A moving plate 203 is horizontally connected to the upper side of the pneumatic slider of the rodless cylinder 201. There are a pair of the first hydraulic cylinders 204, which are symmetrically distributed left and right. The first hydraulic cylinders 204 are arranged vertically upward and are connected to the front side of the moving plate 203. Rectangular avoidance grooves 10a are symmetrically arranged on the left and right sides of the working platform 10 on both sides of the rodless cylinder 201. The first hydraulic cylinders 204 on the same side are slidably arranged in the avoidance grooves 10a. The ends of the piston rods of the two first hydraulic cylinders 204 are both connected with a first hinge seat 205. A "┏"-shaped first hinge bar 206 is hinged on each of the first hinge seats 205. A second hinge seat 207 is connected to the rear of the moving plate 203 on both sides of the two first hydraulic cylinders 204. A "┃"-shaped second hinge bar 208 is hinged on each of the second hinge seats 207. The other end of the first hinge bar 206 on the same side is connected to the other end of the second hinge bar 208. The positioning tube 209 is horizontally connected to the front sides of the two first hinge bars 206. A rectangular positioning opening 209a is arranged in the middle of the positioning tube 209. Rectangular positioning grooves 209b are symmetrically arranged on the left and right sides of the positioning opening 209a. Triangular positioning blocks 209c are arranged at the inner ends of the positioning grooves 209b. Circular adsorption holes 209d are evenly distributed at the bottom of the positioning grooves 209b. Suction pipes 210 are connected to both the left and right ends of the positioning tube 209. The suction pipes 210 are connected to an external negative pressure air source. "√"-shaped limiting bars 211 are evenly connected to the lower side of the positioning tube 209. Rectangular limiting grooves 211a are arranged at the lower ends of the limiting bars 211.

[0036] In this embodiment, the softening mechanism 30 includes a first heat preservation bin 301, a first support column 302, a first heat preservation sheet 303, a second hydraulic cylinder 304 and a heating strip 306. A rectangular first inlet 301a is arranged in the middle of the front side of the first heat preservation bin 301. Rectangular first inlet grooves 301b are symmetrically arranged on the lower side of the first heat preservation bin 301. The first heat preservation bin 301 is centrally connected to the upper side of the working platform 10 through four first support columns 302. A plurality of the first heat preservation sheets 303 are evenly rotatably connected at the first inlet 301a. There are a pair of the second hydraulic cylinders 304, which are symmetrically distributed left and right. The second hydraulic cylinders 304 are arranged vertically downward and are connected to the upper side of the first heat preservation bin 301. The ends of the piston rods of the two second hydraulic cylinders 304 are both connected with a first heat insulation frame 305. The heating strip 306 is horizontally connected to the lower sides of the two first heat insulation frames 305. A plurality of pairs of heating sheets 307 are evenly distributed on the lower side of the heating strip 306. A pair of electric heating rods 308 are inserted in parallel inside the heating strip 306.

[0037] In this embodiment, the shaping mechanism 40 includes a second heat preservation bin 401, second support columns 402, second heat preservation sheets 403, a third hydraulic cylinder 404 and a cooling pipe 406. A rectangular second inlet 401a is provided in the center of the front side of the second heat preservation bin 401. Rectangular second inlet grooves 401b are symmetrically provided on the lower side of the second heat preservation bin 401. The second heat preservation bin 401 is connected to the upper side of the working platform 10 by four second support columns 402 at the rear. A number of second heat preservation sheets 403 are evenly and rotatably connected at the second inlet 401a. A pair of third hydraulic cylinders 404 are provided and are symmetrically distributed left and right. The third hydraulic cylinder 404 is vertically downward and connected to the upper side of the second heat preservation bin 401. The ends of the piston rods of the two third hydraulic cylinders 404 are both connected with a second heat insulation frame 405. The cooling pipe 406 is horizontally connected to the lower sides of the two second heat insulation frames 405. Rectangular air outlet grooves 406a are evenly distributed on the lower side of the cooling pipe 406. An air inlet pipe 407 is connected to the upper side of the cooling pipe 406, and the air inlet pipe 407 is connected to an external cold air source.

[0038] In this embodiment, a refrigeration component 408 is installed in the center of the upper side of the second heat preservation bin 401. The refrigeration component 408 includes a refrigeration sheet 4081, a refrigeration plate 4082, a refrigeration cover 4083, a heat dissipation plate 4086, a heat dissipation cover 4087 and a heat insulation strip 40810. The refrigeration sheet 4081 is vertically arranged above the second heat preservation bin 401. The heat dissipation plate 4086 and the refrigeration plate 4082 are respectively attached to the front and rear sides of the refrigeration sheet 4081. The heat dissipation cover 4087 and the refrigeration cover 4083 are correspondingly installed on the outer sides of the heat dissipation plate 4086 and the refrigeration plate 4082. An annular first air inlet 4083a is provided on the rear side of the refrigeration cover 4083 and a first air inlet fan 4084 is installed on the inner side thereof. A circular first air outlet 4083b is provided on the upper side of the refrigeration cover 4083 and a "ㄑ"-shaped first air outlet pipe 4085 is connected to the outer side thereof. The other end of the first air outlet pipe 4085 is communicated with the other end of the air guide pipe 407. An annular second air inlet 4087a is provided on the front side of the heat dissipation cover 4087 and a second air inlet fan 4088 is installed on the inner side thereof. A circular second air outlet 4087b is provided on the upper side of the heat dissipation cover 4087 and a "│"-shaped second air outlet pipe 4089 is connected to the outer side thereof. A pair of heat insulation strips 40810 are provided and are symmetrically distributed on the left and right sides of the refrigeration sheet 4081.

[0039] When this cooling and shaping device for the injection-molded air-conditioning swing blades is actually applied, it includes the following working process:

[0040] Step 1: Move the positioning pipe 209 to the most forward position through the rodless cylinder 201;

[0041] Step 2: Place the air conditioner swing blade 50 to be corrected at a specified position on the positioning tube 209, and firmly adsorb the air conditioner swing blade 50 through negative pressure;

[0042] Step 3: Move the positioning tube 209 and the air conditioner swing blade 50 backward to the lower part of the first heat preservation bin 301 through the rodless cylinder 201;

[0043] Step 4: Extend the piston rod of the first hydraulic cylinder 204 to drive the positioning tube 209 and the air conditioner swing blade 50 to transfer into the first heat preservation bin 301. Then, extend the piston rod of the second hydraulic cylinder 304 to drive the heating strip 306 to descend and approach the air conditioner swing blade 50. Then, heat and soften the air conditioner swing blade 50 through the heating strip 306. After heating, contract the piston rod of the first hydraulic cylinder 204 to drive the positioning tube 209 and the air conditioner swing blade 50 to transfer out of the first heat preservation bin 301;

[0044] Step 5: Move the positioning tube 209 and the air conditioner swing blade 50 backward to the lower part of the second heat preservation bin 401 through the rodless cylinder 201;

[0045] Step 6: Extend the piston rod of the first hydraulic cylinder 204 to drive the positioning tube 209 and the air conditioner swing blade 50 to transfer into the second heat preservation bin 401. Then, extend the piston rod of the second hydraulic cylinder 404 to drive the cooling tube 406 to descend and approach the air conditioner swing blade 50. Then, spray cold air through the air outlet groove 406a on the cooling tube 406 to cool and shape the air conditioner swing blade 50. After shaping, contract the piston rod of the first hydraulic cylinder 204 to drive the positioning tube 209 and the air conditioner swing blade 50 to transfer out of the second heat preservation bin 401;

[0046] Step 7: Move the positioning tube 209 and the corrected air conditioner swing blade 50 to the frontmost through the rodless cylinder 201, and then remove the air conditioner swing blade 50.

[0047] Therefore, the above - disclosed implementation schemes are, in all aspects, merely illustrative and not the only ones. All changes within the scope of the present invention or within the scope equivalent to the present invention are encompassed by the present invention.

Claims

1. A cooling and shaping device for injection molding of air conditioner swing blades, characterized in that: it includes a working platform (10), a displacement mechanism (20), a softening mechanism (30) and a shaping mechanism (40), wherein: the working platform (10) is horizontally arranged; the displacement mechanism (20) is located above the working platform (10) and is used to adjust the spatial position and spatial attitude of the air conditioner swing blade (50); the softening mechanism (30) is located in the middle of the working platform (10) and heats and softens the air conditioner swing blade (50) through hot air; the shaping mechanism (40) is located behind the working platform (10) and cools and shapes the softened air conditioner swing blade (50) through cold air; the displacement mechanism (20) includes a rodless cylinder (201), a first hydraulic cylinder (204) and a positioning tube (209). The rodless cylinder (201) is arranged in the front-back direction and is installed on the upper side of the working platform (10) through a pair of fixing pieces (202). A moving plate (203) is horizontally connected to the upper side of the pneumatic slider of the rodless cylinder (201). There are a pair of the first hydraulic cylinders (204) which are symmetrically distributed left and right. The first hydraulic cylinders (204) are arranged vertically upward and are connected to the front of the moving plate (203). The working platform (10) is symmetrically provided with rectangular avoidance grooves (10a) on the left and right sides of the rodless cylinder (201). The first hydraulic cylinders (204) on the same side are slidably arranged in the avoidance grooves (10a). The ends of the piston rods of the two first hydraulic cylinders (204) are both connected with a first hinge seat (205). A "┏”-shaped hinge bar one (206) is hinged on each of the first hinge seats (205). The moving plate (203) is connected with a second hinge seat (207) behind the two first hydraulic cylinders (204). A "┃”-shaped hinge bar two (208) is hinged on each of the second hinge seats (207). The other end of the hinge bar one (206) on the same side is connected with the other end of the hinge bar two (208). The positioning tube (209) is horizontally connected to the front sides of the two hinge bars one (206). A rectangular positioning opening (209a) is arranged in the middle of the positioning tube (209). Rectangular positioning grooves (209b) are symmetrically arranged on the left and right sides of the positioning opening (209a). Triangular positioning blocks (209c) are arranged at the inner ends of the positioning grooves (209b). Circular adsorption holes (209d) are evenly distributed at the bottom of the positioning grooves (209b). Suction pipes (210) are connected to both the left and right ends of the positioning tube (209). The suction pipes (210) are connected to an external negative pressure air source. "√”-shaped limiting strips (211) are evenly connected to the lower side of the positioning tube (209). Rectangular limiting grooves (211a) are arranged at the lower ends of the limiting strips (211); The softening mechanism (30) includes a first heat preservation bin (301), a first support column (302), a first heat preservation sheet (303), a second hydraulic cylinder (304) and a heating strip (306). A rectangular first inlet (301a) is provided in the center of the front side of the first heat preservation bin (301). Rectangular first inlet grooves (301b) are symmetrically provided on the lower side of the first heat preservation bin (301). The first heat preservation bin (301) is centrally connected to the upper side of the working platform (10) through four first support columns (302). A number of first heat preservation sheets (303) are provided and are evenly rotatably connected to the first inlet (301a). A pair of second hydraulic cylinders (304) are provided and are symmetrically distributed left and right. The second hydraulic cylinders (304) are arranged vertically downward and are connected to the upper side of the first heat preservation bin (301). The ends of the piston rods of the two second hydraulic cylinders (304) are both connected with a first heat insulation frame (305). The heating strip (306) is horizontally connected to the lower sides of the two first heat insulation frames (305). A number of pairs of heating sheets (307) are evenly distributed on the lower side of the heating strip (306). A pair of electric heating rods (308) are inserted in parallel inside the heating strip (306); The shaping mechanism (40) includes a second heat preservation bin (401), a second support column (402), a second heat preservation sheet (403), a third hydraulic cylinder (404) and a cooling pipe (406). A rectangular second inlet (401a) is provided in the center of the front side of the second heat preservation bin (401). Rectangular second inlet grooves (401b) are symmetrically provided on the lower side of the second heat preservation bin (401). The second heat preservation bin (401) is connected to the upper side of the working platform (10) through four second support columns (402) at the rear. A number of second heat preservation sheets (403) are provided and are evenly rotatably connected to the second inlet (401a). A pair of third hydraulic cylinders (404) are provided and are symmetrically distributed left and right. The third hydraulic cylinders (404) are arranged vertically downward and are connected to the upper side of the second heat preservation bin (401). The ends of the piston rods of the two third hydraulic cylinders (404) are both connected with a second heat insulation frame (405). The cooling pipe (406) is horizontally connected to the lower sides of the two second heat insulation frames (405). Rectangular air outlet grooves (406a) are evenly distributed on the lower side of the cooling pipe (406). An air inlet pipe (407) is connected to the upper side of the cooling pipe (406). The air inlet pipe (407) is connected to an external cold air source; A refrigeration component (408) is centrally installed on the upper side of the second heat preservation bin (401). The refrigeration component (408) includes a refrigeration sheet (4081), a refrigeration plate (4082), a refrigeration cover (4083), a heat dissipation plate (4086), a heat dissipation cover (4087) and a heat insulation strip (40810). The refrigeration sheet (4081) is vertically arranged above the second heat preservation bin (401). The heat dissipation plate (4086) and the refrigeration plate (4082) are respectively attached to the front and rear sides of the refrigeration sheet (4081). The heat dissipation cover (4087) and the refrigeration cover (4083) are correspondingly installed on the outer sides of the heat dissipation plate (4086) and the refrigeration plate (4082). An annular air inlet one (4083a) is provided at the rear side of the refrigeration cover (4083), and an air inlet fan one (4084) is installed inside it. A circular air outlet one (4083b) is provided at the upper side of the refrigeration cover (4083), and a "ㄥ”-shaped air outlet pipe one (4085) is connected to its outer side. The other end of the air outlet pipe one (4085) is communicated with the other end of the air guide pipe (407). An annular air inlet two (4087a) is provided at the front side of the heat dissipation cover (4087), and an air inlet fan two (4088) is installed inside it. A circular air outlet two (4087b) is provided at the upper side of the heat dissipation cover (4087), and a "│”-shaped air outlet pipe two (4089) is connected to its outer side. A pair of heat insulation strips (40810) are provided and symmetrically distributed on the left and right sides of the refrigeration sheet (4081).

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