Efficient cooling device for producing leather auxiliaries

Abstract

The invention relates to the technical field of assistant processing, and discloses an efficient cooling device for producing leather assistants.The efficient cooling device comprises a cooling cylinder, a feeding port is formed in the center axis of the top of the cooling cylinder, an arc-shaped switch plate is hinged to the side wall of the cooling cylinder through a hinge, and a partition plate is fixedly connected to the bottom of the inner wall of the cooling cylinder; the outer surface of the partition plate is fixedly connected with an inclined sleeve in a sleeving mode, the outer surface of the inclined sleeve is fixedly connected with the inner wall of the cooling cylinder, the cooling device further comprises a cold air inlet pipe, and the bottom of the cold air inlet pipe is fixedly connected with the bottom of the inner wall of the cooling cylinder. According to the leather auxiliary agent cooling device, cold air in a cold air inlet pipe can be discharged from a first cold air outlet groove, a second cold air outlet groove and a third cold air outlet groove, and after the discharged cold air makes contact with the surfaces of a first cooling plate, a second cooling plate and a third cooling plate, the temperature of the surfaces of the first cooling plate, the second cooling plate and the third cooling plate can be reduced; and the leather auxiliary agent is effectively cooled.

Description

Technical Field

[0001] The invention relates to the technical field of auxiliary agent processing, in particular to a high-efficiency cooling device for producing leather auxiliary agents. Background Art

[0002] Leather auxiliaries are an indispensable element in leather production. They cover many types, such as fatliquors that make leather soft, dyeing auxiliaries that make the color uniform and bright, and tanning agents that enhance the stability of leather. These auxiliaries play a key role in all aspects of leather making, improving the quality, performance and appearance of leather, and meeting the market's diverse needs for leather products.

[0003] Patent application with application number CN202222788109.9 discloses a high-efficiency cooling device for the production of additives, including a device body, a box cover movably installed on the top of the device body, a through hole penetrated through the lower surface of the fan cover, a water pipe penetrated through one side of the fan cover, a fixing rod is inserted into the limiting groove, and a tension spring is penetrated through the top of the fixing rod; the fan inside the fan cover at the bottom of the box cover is driven by a motor to initially cool the additive produced at the bottom of the inner cavity of the device body.

[0004] In the production process of leather auxiliaries, the raw materials are heated to fuse with each other. However, since this heating and fusing operation will cause the temperature to rise, there is a need to cool it. Cooling can not only make the reaction proceed according to the predetermined steps, but also prevent problems such as product performance degradation or deterioration due to excessive temperature. It plays a key role in ensuring the quality and performance stability of leather auxiliaries. Therefore, we proposed an efficient cooling device for the production of leather auxiliaries. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a high-efficiency cooling device for producing leather auxiliaries to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a high-efficiency cooling device for producing leather auxiliaries, comprising a cooling cylinder, a feed port is provided at the top center axis of the cooling cylinder, a curved switch plate is hingedly connected to the side wall of the cooling cylinder through a hinge, a partition is fixedly connected to the bottom of the inner wall of the cooling cylinder, an inclined sleeve is fixedly sleeved on the outer surface of the partition, and the outer surface of the inclined sleeve is fixedly connected to the inner wall of the cooling cylinder, and further comprising:

[0007] A cold air inlet pipe, the bottom of which is fixedly connected to the bottom of the inner wall of the cooling cylinder, the top of which passes through the feed port, the outer surface of the cold air inlet pipe is fixedly connected with a cooling plate 1, a cooling plate 2 is arranged at a lower end of the cooling plate, the cold air inlet pipe passes through cooling plate 2, four groups of connecting rods are fixedly connected to the inner wall of cooling plate 2, the ends of the four groups of connecting rods away from cooling plate 2 are fixedly connected to the outer surface of the cold air inlet pipe, the outer surface of the cold air inlet pipe is fixedly connected with a cooling plate 3, the cooling plate 3 is located at the bottom of cooling plate 2, and the cooling plates 1, 2 and 3 are all used for auxiliary cooling of leather auxiliaries.

[0008] Preferably, the outer surface of the cold air inlet pipe is provided with a cold air outlet groove one, a cold air outlet groove two and a cold air outlet groove three, the groove width of the cold air outlet groove one is greater than the groove width of the cold air outlet groove two, the groove width of the cold air outlet groove two is greater than the groove width of the cold air outlet groove three, the cold air outlet groove one, the cold air outlet groove two and the cold air outlet groove three are each provided with four groups, and the cold air outlet groove one, the cold air outlet groove two and the cold air outlet groove three are used to deliver the cold air in the cold air inlet pipe to the cooling plate one, the cooling plate two and the cooling plate three, respectively.

[0009] Preferably, a groove is provided on the surface of cooling plate one, a fixing ring is fixedly connected to the top of cooling plate one, an extension ring plate is fixedly connected to the outer surface of cooling plate one, the outer diameter of the extension ring plate is smaller than the outer diameter of cooling plate two, a cleaning mechanism is provided on the top of cooling plate one, a guide mechanism is provided on the outer surface of the cold air inlet pipe, and the groove is used to guide the leather additive to slide to the extension ring plate and then fall from the extension ring plate.

[0010] Preferably, an annular tube is provided on the outer surface of the fixed ring, and the annular tube is located at the top of the extended ring plate. An air outlet hole is opened on the surface of the annular tube, and the air outlet hole is aligned with the extended ring plate. The annular tube is used to guide the cold air in the cold air inlet pipe from the air outlet hole to the extended ring plate.

[0011] Preferably, the cleaning mechanism includes a cold air connecting pipe, which passes through cooling plate one and is connected to the cold air inlet pipe. One end of the cold air connecting pipe away from the cold air inlet pipe passes through a fixed ring and is connected to an annular pipe. A rotating ring is sleeved on the outer surface of the cold air connecting pipe. A deflection plate is fixedly connected to the outer surface of the rotating ring. The deflection plate is located above cooling plate one and is adapted to the shape of cooling plate one. The deflection plate is used to clean the leather additives accumulated above cooling plate one into the groove.

[0012] Preferably, the cleaning mechanism also includes a connecting frame, which is fixedly connected to the inner wall of the fixed ring, and the connecting frame is arranged in an inclined "L" shape. A spring is fixedly connected to the inner wall of the connecting frame, and one end of the spring away from the connecting frame is fixedly connected to the deflection plate, and the spring is used to reset the deflection plate after it is deflected by an external force.

[0013] Preferably, the guide mechanism includes a ring, which is rotatably connected to the surface of the cold air inlet pipe, and eight groups of inclined plates are fixedly connected to the inner wall of the ring, and a knocking frame is fixedly connected to the outer surface of the ring. The four groups of cold air outlet grooves are all connected to the inside of the ring, and the ring drives the knocking frame to knock on the deflection plate when the cold air is blown.

[0014] Preferably, the guide mechanism also includes a guide plate, which passes through the ring and extends to the inside of the ring to contact the inner wall of the ring, the outer surface of the guide plate contacts the outer surface of the cold air inlet pipe, and four groups of air outlet grooves are opened on the surface of the guide plate, and the four groups of air outlet grooves are respectively connected to four groups of cold air outlet grooves, and the four groups of air outlet grooves are used to guide the airflow from the cold air outlet groove.

[0015] Compared with the prior art, the present invention provides a high-efficiency cooling device for producing leather auxiliaries, which has the following beneficial effects:

[0016] 1. The present invention arranges a cold air inlet pipe so that the cold air in the cold air inlet pipe can be discharged from the cold air outlet slot 1, the cold air outlet slot 2 and the cold air outlet slot 3, and the discharged cold air will reduce the temperature of the surfaces of the cooling plates 1, 2 and 3 after contacting with the surfaces of the cooling plates 1, 2 and 3. When the leather auxiliary agent falls above them, they cooperate with each other to effectively cool the leather auxiliary agent.

[0017] 2. The present invention provides an annular tube, and the air outlet holes on the surface of the annular tube are aligned with the extension ring plate. When the leather additives slide down the extension ring plate through the grooves, the leather on the extension ring plate can be assisted to fall onto the second cooling plate, and the cooling effect on the leather additives can be further enhanced.

[0018] 3. The present invention sets a deflection plate. After the deflection action, the deflection plate can push the leather additives on the cooling plate into the groove, effectively avoiding the accumulation of leather additives on the surface of the cooling plate. At the same time, after the deflection is completed, the deflection plate can be reset with the help of a rotating ring and the assistance of a spring.

[0019] 4. The present invention provides an air outlet groove on the surface of the guide plate. After the cold air is discharged from the air outlet groove, it can flow along the guide plate, thereby assisting in cooling the leather additives on the cooling plate. After the guide plate is picked up, the cold air will drive the ring and the knocking frame to impact the deflection plate with the assistance of the inclined plate, thereby providing power for the deflection of the deflection plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a stereogram of the present invention;

[0021] Figure 2It is a cross-sectional view of the present invention;

[0022] Figure 3 It is a cross-sectional view of cooling plate 1, cooling plate 2 and cooling plate 3 of the present invention;

[0023] Figure 4 It is a cross-sectional view of the first cooling plate, the extended ring plate and the annular tube of the present invention;

[0024] Figure 5 It is a schematic structural diagram of a cooling plate 1 of the present invention;

[0025] Figure 6 It is a structural schematic diagram of the cleaning mechanism of the present invention;

[0026] Figure 7 It is an exploded view of the flow guiding mechanism of the present invention;

[0027] Figure 8 is a cross-sectional view of the flow guiding mechanism of the present invention;

[0028] Fig. 9 For the present invention Figure 8 A is an enlarged schematic diagram.

[0029] In the figure: 1. cooling cylinder; 2. feed port; 3. arc switch plate; 4. cold air inlet pipe; 41. cold air outlet slot one; 42. cold air outlet slot two; 43. cold air outlet slot three; 5. partition; 6. inclined sleeve; 7. cooling plate one; 71. slot; 72. fixed ring; 73. extension ring plate; 74. annular tube; 741. air outlet; 75. cleaning mechanism; 751. cold air connecting pipe; 752. rotating ring; 753. deflection plate; 754. connecting frame; 755. spring; 76. guide mechanism; 761. sleeve ring; 762. knocking frame; 763. inclined plate; 764. guide plate; 765. air outlet slot; 8. cooling plate two; 81. connecting rod; 9. cooling plate three. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] For example, see Figure 1-4 The present invention provides a technical solution: a high-efficiency cooling device for producing leather auxiliaries, comprising a cooling cylinder 1, a feed port 2 is provided at the top center axis of the cooling cylinder 1, a curved switch plate 3 is hingedly connected to the side wall of the cooling cylinder 1 through a hinge, a partition 5 is fixedly connected to the bottom of the inner wall of the cooling cylinder 1, an inclined sleeve 6 is fixedly sleeved on the outer surface of the partition 5, and the outer surface of the inclined sleeve 6 is fixedly connected to the inner wall of the cooling cylinder 1, and further comprising:

[0034] The cold air inlet pipe 4, the bottom of the cold air inlet pipe 4 is fixedly connected to the bottom of the inner wall of the cooling cylinder 1, the top of the cold air inlet pipe 4 passes through the feed port 2, the outer surface of the cold air inlet pipe 4 is fixedly connected with a cooling plate 7, the lower end of the cooling plate 7 is provided with a cooling plate 2 8, the cold air inlet pipe 4 passes through the cooling plate 2 8, the inner wall of the cooling plate 2 8 is fixedly connected with four groups of connecting rods 81, the ends of the four groups of connecting rods 81 away from the cooling plate 2 8 are fixedly connected to the outer surface of the cold air inlet pipe 4, and the outer surface of the cold air inlet pipe 4 is fixedly connected with a cooling plate Three 9, cooling plate three 9 is located at the bottom of cooling plate two 8, cooling plates one 7, cooling plates two 8 and cooling plates three 9 are all used for auxiliary cooling of leather additives. When the leather additives enter the cooling cylinder 1 from the feed port 2, the leather additives slide down along cooling plate one to cooling plate two 8, and then slide down from cooling plate two 8 to cooling plate three 9. The leather additives slide down through cooling plate three 9 to the top of the inclined sleeve 6. After being collected by the inclined sleeve 6, the arc switch plate 3 is opened after the cooling structure to collect the leather additives.

[0035] The outer surface of the cold air inlet pipe 4 is provided with a cold air outlet groove 1 41, a cold air outlet groove 2 42 and a cold air outlet groove 3 43. The groove width of the cold air outlet groove 1 41 is greater than the groove width of the cold air outlet groove 2 42, and the groove width of the cold air outlet groove 2 42 is greater than the groove width of the cold air outlet groove 3 43. Four groups of cold air outlet grooves 1 41, cold air outlet grooves 2 42 and cold air outlet grooves 3 43 are arranged. The cold air outlet grooves 1 41, cold air outlet grooves 2 42 and cold air outlet grooves 3 43 are used to send the cold air in the cold air inlet pipe 4 to the cooling plate 1 7, cooling plate 2 8 and cooling plate 3 9 respectively. After the cold air in the cold air inlet pipe 4 is discharged from the cold air outlet groove 1 41, cold air outlet groove 2 42 and cold air outlet groove 3 43, the drifting cold air contacts the surfaces of the cooling plates 1 7, cooling plates 2 8 and cooling plates 3 9 to reduce their surface temperatures, thereby assisting in cooling the leather additives.

[0036] The surface of the cooling plate 7 is provided with a slot 71, a fixing ring 72 is fixedly connected to the top of the cooling plate 7, an extension ring plate 73 is fixedly connected to the outer surface of the cooling plate 7, the outer diameter of the extension ring plate 73 is smaller than the outer diameter of the cooling plate 8, a cleaning mechanism 75 is provided on the top of the cooling plate 7, a guide mechanism 76 is sleeved on the outer surface of the cold air inlet pipe 4, the slot 71 is used to guide the leather auxiliary agent to slide to the extension ring plate 73 and then fall from the extension ring plate 73, an annular tube 74 is provided on the outer surface of the fixing ring 72, and the annular tube 74 is located at the extension ring plate 73 At the top, an air outlet hole 741 is opened on the surface of the annular tube 74, and the air outlet hole 741 is aligned with the extended ring plate 73. The annular tube 74 is used to guide the cold air in the cold air inlet pipe 4 from the air outlet hole 741 to the extended ring plate 73. When the leather additive falls onto the top of the cooling plate 7, the leather additive falls onto the top of the extended ring plate 73 through the groove 71, thereby increasing the contact area between the leather additive and the cold air, and the cold air in the annular tube 74 is discharged through the air outlet hole 741 and blown toward the extended ring plate 73, so as to cool the leather additive on the extended ring plate 73.

[0037] Example 2, based on Example 1, please refer to Figure 5-6 The present invention provides a technical solution: the cleaning mechanism 75 includes a cold air connecting pipe 751, the cold air connecting pipe 751 penetrates the cooling plate 7 and is connected to the cold air inlet pipe 4, one end of the cold air connecting pipe 751 away from the cold air inlet pipe 4 penetrates the fixed ring 72 and is connected to the annular pipe 74, the outer surface of the cold air connecting pipe 751 is sleeved with a rotating ring 752, the outer surface of the rotating ring 752 is fixedly connected with a deflection plate 753, the deflection plate 753 is located above the cooling plate 7 and is adapted to the shape of the cooling plate 7, and the deflection plate 753 is used to clean the leather additives accumulated above the cooling plate 7 into the groove 71. The cleaning mechanism 75 also includes a connecting frame 754, which is fixedly connected to the inner wall of the fixing ring 72. The connecting frame 754 is set in an inclined "L" shape. A spring 755 is fixedly connected to the inner wall of the connecting frame 754. The end of the spring 755 away from the connecting frame 754 is fixedly connected to the deflection plate 753. The spring 755 is used to reset the deflection plate 753 after it is deflected by an external force. When the leather additive is located above the cooling plate 7, part of the leather additive does not fall normally through the slot 71, wherein the deflection plate 753 is deflected by the rotating ring 752 under the action of an external force, and the leather additive on the cooling plate 7 is pushed into the slot 71. When the deflection plate 753 is deflected, the spring 755 is squeezed. After the spring 755 is compressed, the deflection plate 753 stops being squeezed, and the spring 755 drives the deflection plate 753 to reset through the rotating ring 752.

[0038] Example 3, based on Example 1 and Example 2, please refer to Figure 7-9The present invention provides a technical solution: the guide mechanism 76 includes a collar 761, the collar 761 is rotatably connected to the surface of the cold air inlet pipe 4, eight groups of inclined plates 763 are fixedly connected to the inner wall of the collar 761, and a knocking frame 762 is fixedly connected to the outer surface of the collar 761. The four groups of cold air outlet grooves 41 are all connected to the inside of the collar 761. The collar 761 drives the knocking frame 762 to knock on the deflection plate 753 under the blowing of the cold air. When the collar 761 is not blocked, the cold air blown out from the cold air outlet groove 41 is blown into the collar 761, wherein under the restriction of the inclined plate 763, the cold air drives the collar 761 to rotate along the cold air inlet pipe 4 through the inclined plate 763, so that the knocking frame 762 can be driven by the collar 761 to impact the deflection plate 753.

[0039] The guide mechanism 76 also includes a guide plate 764, which passes through the ring 761 and extends to the inside of the ring 761 to contact the inner wall of the ring 761, and the outer surface of the guide plate 764 contacts the outer surface of the cold air inlet pipe 4. Four groups of air outlet grooves 765 are opened on the surface of the guide plate 764, and the four groups of air outlet grooves 765 are respectively connected to the four groups of cold air outlet grooves 41. The four groups of air outlet grooves 765 are used to guide the airflow from the cold air outlet groove 41. After the cold air in the cold air inlet pipe 4 passes through the cold air outlet groove 41 and contacts the surface of the guide plate 764, the cold air is discharged outward through the air outlet groove 765. After the cold air is discharged from the air outlet groove 765, it flows along the guide plate 764 to cool the leather additives on the cooling plate 7.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency cooling device for producing leather auxiliaries, comprising a cooling cylinder (1), a feed port (2) being provided at the center axis of the top of the cooling cylinder (1), a curved switch plate (3) being hingedly connected to the side wall of the cooling cylinder (1) via a hinge, a partition (5) being fixedly connected to the bottom of the inner wall of the cooling cylinder (1), an inclined sleeve (6) being fixedly sleeved on the outer surface of the partition (5), and the outer surface of the inclined sleeve (6) being fixedly connected to the inner wall of the cooling cylinder (1), characterized in that: Also includes: A cold air inlet pipe (4), the bottom of which is fixedly connected to the bottom of the inner wall of the cooling cylinder (1), the top of which passes through the feed port (2), the outer surface of which is fixedly connected to a cooling plate 1 (7), the lower end of which is provided with a cooling plate 2 (8), the cold air inlet pipe (4) passes through the cooling plate 2 (8), the inner wall of the cooling plate 2 (8) is fixedly connected to four groups of connecting rods (81), the ends of the four groups of connecting rods (81) away from the cooling plate 2 (8) are fixedly connected to the outer surface of the cold air inlet pipe (4), the outer surface of the cold air inlet pipe (4) is fixedly connected to a cooling plate 3 (9), the cooling plate 3 (9) is located at the bottom of the cooling plate 2 (8), and the cooling plate 1 (7), the cooling plate 2 (8) and the cooling plate 3 (9) are all used for auxiliary cooling of leather auxiliaries.

2. The high-efficiency cooling device for producing leather auxiliaries according to claim 1, characterized in that: The outer surface of the cold air inlet pipe (4) is provided with a cold air outlet groove 1 (41), a cold air outlet groove 2 (42) and a cold air outlet groove 3 (43); the groove width of the cold air outlet groove 1 (41) is greater than the groove width of the cold air outlet groove 2 (42); the groove width of the cold air outlet groove 2 (42) is greater than the groove width of the cold air outlet groove 3 (43); the cold air outlet groove 1 (41), the cold air outlet groove 2 (42) and the cold air outlet groove 3 (43) are each provided with four groups; the cold air outlet groove 1 (41), the cold air outlet groove 2 (42) and the cold air outlet groove 3 (43) are used to deliver the cold air in the cold air inlet pipe (4) to the cooling plate 1 (7), the cooling plate 2 (8) and the cooling plate 3 (9) respectively.

3. The high-efficiency cooling device for producing leather auxiliaries according to claim 2, characterized in that: The surface of the cooling plate 1 (7) is provided with a groove (71), the top of the cooling plate 1 (7) is fixedly connected with a fixing ring (72), the outer surface of the cooling plate 1 (7) is fixedly connected with an extension ring plate (73), the outer diameter of the extension ring plate (73) is smaller than the outer diameter of the cooling plate 2 (8), the top of the cooling plate 1 (7) is provided with a cleaning mechanism (75), the outer surface of the cold air inlet pipe (4) is provided with a guide mechanism (76), and the groove (71) is used to guide the leather additive to slide to the extension ring plate (73) and then fall from the extension ring plate (73).

4. The high-efficiency cooling device for producing leather auxiliaries according to claim 3, characterized in that: An annular tube (74) is provided on the outer surface of the fixing ring (72), the annular tube (74) is located at the top of the extension ring plate (73), an air outlet hole (741) is opened on the surface of the annular tube (74), the air outlet hole (741) is aligned with the extension ring plate (73), and the annular tube (74) is used to guide the cold air in the cold air inlet pipe (4) from the air outlet hole (741) to the extension ring plate (73).

5. The high-efficiency cooling device for producing leather auxiliaries according to claim 4, characterized in that: The cleaning mechanism (75) comprises a cold air connecting pipe (751), wherein the cold air connecting pipe (751) passes through the cooling plate (7) and is connected to the cold air inlet pipe (4); one end of the cold air connecting pipe (751) away from the cold air inlet pipe (4) passes through the fixed ring (72) and is connected to the annular pipe (74); a rotating ring (752) is sleeved on the outer surface of the cold air connecting pipe (751); a deflection plate (753) is fixedly connected to the outer surface of the rotating ring (752); the deflection plate (753) is located above the cooling plate (7) and is adapted to the shape of the cooling plate (7); the deflection plate (753) is used to clean the leather additives accumulated above the cooling plate (7) into the groove (71).

6. The high-efficiency cooling device for producing leather auxiliaries according to claim 5, characterized in that: The cleaning mechanism (75) further comprises a connecting frame (754), wherein the connecting frame (754) is fixedly connected to the inner wall of the fixing ring (72), the connecting frame (754) being arranged in an inclined "L" shape, a spring (755) being fixedly connected to the inner wall of the connecting frame (754), one end of the spring (755) away from the connecting frame (754) being fixedly connected to the deflection plate (753), and the spring (755) being used to reset the deflection plate (753) after it is deflected by an external force.

7. The high-efficiency cooling device for producing leather auxiliaries according to claim 3, characterized in that: The guide mechanism (76) comprises a collar (761) which is rotatably connected to the surface of the cold air inlet pipe (4); eight groups of inclined plates (763) are fixedly connected to the inner wall of the collar (761); a knocking frame (762) is fixedly connected to the outer surface of the collar (761); the four groups of cold air outlet slots (41) are all connected to the inside of the collar (761); and the collar (761) drives the knocking frame (762) to knock on the deflection plate (753) when the cold air is blown.

8. The high-efficiency cooling device for producing leather auxiliaries according to claim 7, characterized in that: The guide mechanism (76) further includes a guide plate (764), the guide plate (764) passing through the collar (761) and extending to the inside of the collar (761) to contact the inner wall of the collar (761), the outer surface of the guide plate (764) contacting the outer surface of the cold air inlet pipe (4), the surface of the guide plate (764) is provided with four groups of air outlet grooves (765), the four groups of air outlet grooves (765) are respectively connected to four groups of cold air outlet grooves one (41), and the four groups of air outlet grooves (765) are used to guide the airflow from the cold air outlet groove one (41).

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