Negative pressure material cooling device

Abstract

The present invention relates to a negative pressure material cooling device, which belongs to the technical field of material cooling and solves the technical problem that the existing cooling device has low cooling efficiency for materials. The negative pressure material cooling device comprises a cooling box, wherein the top and bottom of the cooling box are respectively provided with a feed port and a discharge port, and the side wall of the cooling box is provided with an air inlet channel connected to a cold air source and an air outlet channel connected to a suction fan, wherein the flow rate of the air inlet channel is A, the flow rate of the air outlet channel is B, T=B-A, wherein 5m 3 / h≤T≤20m 3 / h; a plug-in plate heat exchange assembly is installed on the side wall of the cooling box. The plug-in plate heat exchange assembly includes a plurality of heat exchange plates with flow channels therein. The plurality of heat exchange plates are inserted into the cooling box. A logistics channel is formed between the heat exchange plate and the side wall of the cooling box and between two adjacent heat exchange plates. The direction of the logistics channel is in the up and down direction. Through the above structure, the negative pressure material cooling device provided by the present invention has a better cooling effect on the material.

Description

Technical Field

[0001] The invention belongs to the technical field of material cooling, and in particular relates to a negative pressure material cooling device. Background Art

[0002] Under the current technical environment, the following two methods are often used to cool solid materials such as powders and particles. One is to contact the material with the heat exchange plate of the plug-in plate cooling component to exchange heat, and the other is to place the material in cold air and use the cold air to take away the heat of the material to cool it. However, no matter which method is used, the efficiency of cooling the material is not high and cannot achieve the effect of rapid cooling. Summary of the invention

[0003] The invention provides a negative pressure material cooling device, which is used to solve the technical problem that the cooling efficiency of the cooling device on the material is low in the prior art.

[0004] The present invention is implemented by the following technical solution: a negative pressure material cooling device, comprising:

[0005] A cooling box, wherein the top and bottom of the cooling box are respectively provided with a feed port and a discharge port, and the side wall of the cooling box is provided with an air inlet channel connected to a cold air source and an air outlet channel connected to a suction fan, the flow rate of the air inlet channel is A, the flow rate of the air outlet channel is B, T=BA, wherein 5m 3 / h≤T≤20m 3 / h;

[0006] The plug-in plate heat exchange component is installed on the side wall of the cooling box. The plug-in plate heat exchange component includes a plurality of heat exchange plates with flow channels arranged therein. The plurality of heat exchange plates are inserted into the cooling box. A logistics channel is formed between the heat exchange plate and the side wall of the cooling box and between two adjacent heat exchange plates. The direction of the logistics channel is in the up and down direction.

[0007] Furthermore, in order to better realize the present invention, the plug-in plate heat exchange assembly also includes a back plate, a medium inlet pipe and a medium outlet pipe, a plurality of the heat exchange plates are connected to the back plate in parallel and at intervals, one end of the flow channels of the plurality of heat exchange plates are connected to the medium inlet pipe, and the other end of the flow channels of the plurality of heat exchange plates are connected to the medium outlet pipe, a first window is opened on the side wall of the cooling box, the back plate is detachably mounted on the side wall of the cooling box by a first screw and blocks the first window, and the medium inlet pipe and the medium outlet pipe are both located outside the cooling box.

[0008] Furthermore, in order to better realize the present invention, a second window is opened on the back panel, and a third window is opened on the side wall of the cooling box, the second window and the third window are arranged opposite to each other, and the first blocking plate and the second blocking plate are respectively installed at the second window and the third window by second screws, and an air outlet pipe is connected to the first blocking plate and the second blocking plate, the two air outlet pipes constitute the air outlet channel, and the two air outlet pipes are connected to the suction fan.

[0009] Furthermore, in order to better realize the present invention, the air intake passage includes four air intake ports opened on the side wall of the cooling box, each of the air intake ports is equipped with an air intake pipe, and the four air intake pipes are respectively connected to the cold air source through an air pipe.

[0010] Furthermore, in order to better realize the present invention, two of the four air inlets are respectively located on both sides of the upper part of the cooling box, and the other two air inlets are respectively located on both sides of the lower part of the cooling box, and the two air inlets located at the upper part of the cooling box constitute an upper inlet, and the two air inlets located at the lower part of the cooling box constitute a lower inlet, and the air outlet pipe is located between the upper inlet and the lower inlet.

[0011] Furthermore, in order to better implement the present invention, screens for blocking materials from entering are installed at the air inlet and in the air outlet pipe.

[0012] Further, in order to better realize the present invention, a semicircular outer convex plate is provided at a position corresponding to the air inlet on the cooling box, an air inlet chamber is formed between the screen and the semicircular outer convex plate, an inlet of the air inlet chamber is provided at one end of the semicircular outer convex plate, the air inlet pipe is rotatably inserted into the inlet and the air inlet pipe extends into the air inlet chamber, the part of the air inlet pipe extending into the air inlet chamber is the air outlet section, the end of the air outlet section is closed and a plurality of air vents are provided on the pipe wall of the air outlet section;

[0013] When the air inlet pipe is rotated, the number of the air holes blocked by the semicircular outer convex plate changes.

[0014] Furthermore, in order to better implement the present invention, a first annular groove is opened on the tube wall of the intake pipe, and a second annular groove is opened on the side wall of the inlet. The first annular groove and the second annular groove are spliced ​​to form a sealing ring installation groove, and a rubber sealing ring is installed in the sealing ring installation groove.

[0015] Furthermore, in order to better implement the present invention, a reference pole is connected to the air intake pipe outside the air intake chamber.

[0016] Furthermore, in order to better implement the present invention, a guide structure with a small top and a large bottom is provided at the top of the heat exchange plate.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The negative pressure material cooling device provided by the present invention is provided with a feed port and a discharge port at the top and the bottom of the cooling box respectively. After the material enters from the feed port, it falls to the discharge port under the action of its own gravity and is discharged. An air inlet channel and an air outlet channel are provided on the side wall of the cooling box. The air inlet channel is connected with a cold air source, so that cold air is introduced into the cooling box, and then the material in the cooling box is air-cooled. The air outlet channel is connected with a suction fan to suck away the air in the cooling box. Specifically, after the material enters the cooling box, heat is exchanged with the cold air in the cooling box, that is, the cold air is heated. The heated air is sucked away by the suction fan, and the cold air enters and is sucked out simultaneously. The flow rate of the air inlet channel and the flow rate of the air outlet channel are defined as A and B respectively, T=BA, 5m 3 / h≤T≤20m 3 / h, that is, in unit time, the amount of air sucked away by the suction fan is greater than the amount of air entering the cooling box from the air inlet passage, thereby forming a negative pressure in the cooling box. With the help of the negative pressure, the cold air in the cold air source can automatically enter the cooling box from the air inlet passage without the need for additional driving components to drive the cold air into the cooling box, thereby reducing components and saving costs;

[0019] A plug-in plate heat exchange assembly is installed on the side wall of the cooling box. Several heat exchange plates of the plug-in plate heat exchange assembly are inserted into the cooling box. The flow channel in the heat exchange plate flows the cooling medium, so that the temperature of the heat exchange plate is relatively low, and a logistics channel is formed between the heat exchange plate and the side wall of the cooling box and between two adjacent heat exchange plates. The direction of the logistics channel is up and down. After the material enters from the feed port, the material will enter the material channel under the action of its own gravity. In this process, the material will contact the surface of the heat exchange plate, thereby performing heat exchange through the heat exchange plate to cool the material.

[0020] Through the above structure, the negative pressure material cooling device provided by the present invention utilizes the combination of cold air and heat exchange plates to cool the material, thereby improving the cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1is a schematic structural diagram of a negative pressure material cooling device provided in an embodiment of the present invention;

[0023] Figure 2 yes Figure 1 A local enlarged view of area A;

[0024] Figure 3 It is a schematic structural diagram of the negative pressure material cooling device provided by an embodiment of the present invention when a benchmark is not installed;

[0025] Figure 4 is an exploded view of the negative pressure material cooling device provided by an embodiment of the present invention when a benchmark and a screen are not installed;

[0026] Figure 5 is a schematic structural diagram of a plug-in plate heat exchange assembly in an embodiment of the present invention;

[0027] Figure 6 yes Figure 5 Another perspective view of the plug-in plate heat exchange assembly shown;

[0028] Figure 7 Schematic diagram of the connection structure between the heat exchange plate, the plug rod and the flat plate in an embodiment of the present invention;

[0029] Figure 8 It is a schematic diagram of the installation structure of the air intake pipe in an embodiment of the present invention.

[0030] In the figure:

[0031] 1-cooling box; 101-feed port; 102-discharge port; 103-semicircular outer convex plate; 104-air inlet chamber; 2-plug-in plate heat exchange assembly; 201-heat exchange plate; 202-back plate; 203-medium inlet pipe; 204-medium outlet pipe; 205-flow guide structure; 206-plug rod; 207-plate; 208-bolt; 209-nut; 3-first screw; 4-second screw; 5-first blocking plate; 6-second blocking plate; 7-air outlet pipe; 8-air inlet pipe; 801-vent; 9-screen; 10-rubber sealing ring; 11-benchmark. DETAILED DESCRIPTION

[0032] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0033] Embodiment 1:

[0034] This embodiment provides a negative pressure material cooling device, which solves the technical problem that the cooling efficiency of the cooling device in the prior art is low for the material.

[0035] The negative pressure material cooling device comprises a cooling box 1, an air cooling system and a plug-in plate heat exchange component 2, wherein:

[0036] The cooling box 1 is a box-type structure, with a feed port 101 and a discharge port 102 respectively provided at the top and bottom of the cooling box 1. Thus, after the material enters from the feed port 101 at the top of the cooling box 1, it will fall to the discharge port 102 under the action of the material's own gravity and be discharged from the cooling box 1. An air inlet channel and an air outlet channel are provided on the side wall of the cooling box 1. The air inlet channel is connected to the cold air source, so that the cold air is introduced into the cooling box 1, and then the material in the cooling box 1 is air-cooled. The air outlet channel is connected to the suction fan to suck away the air in the cooling box 1. Specifically, after the material enters the cooling box 1, it exchanges heat with the cold air in the cooling box 1, that is, heats the cold air, and the heated air is sucked away by the suction fan, and the cold air enters and is sucked out simultaneously.

[0037] Define the flow rate of the inlet channel and the flow rate of the outlet channel as A and B respectively, T = BA, 5m 3 / h≤T≤20m 3 / h, that is, in unit time, the amount of air sucked away by the suction fan is greater than the amount of air entering the cooling box 1 from the air intake passage, thereby forming a negative pressure in the cooling box 1. With the help of the negative pressure, the cold air in the cold air source can automatically enter the cooling box 1 from the air intake passage without the need for additional driving components to drive the cold air into the cooling box 1, thereby reducing parts and saving costs.

[0038] The plug-in plate heat exchange assembly 2 is installed on the side wall of the cooling box 1. The plug-in plate heat exchange assembly 2 includes a plurality of heat exchange plates 201. The heat exchange plates 201 are actually heat conducting plates. A flow channel is arranged inside the heat exchange plates 201. The cooling medium flows through the flow channel, so that the temperature of the heat exchange plates 201 is relatively low. The plurality of heat exchange plates 201 are all inserted into the cooling box 1, and a logistics channel is formed between the heat exchange plate 201 and the side wall of the cooling box 1 and between two adjacent heat exchange plates 201. The direction of the logistics channel is in the up and down direction. After the material enters from the feed port 101, the material will enter the material channel under the action of its own gravity. In this process, the material will contact the surface of the heat exchange plate 201, so as to exchange heat through the heat exchange plate 201 to cool the material.

[0039] Through the above structure, the negative pressure material cooling device provided by the present invention utilizes the combination of cold air and the heat exchange plate 201 to cool the material, thereby improving the cooling efficiency.

[0040] The plug-in heat exchange assembly 2 in this embodiment further includes a back plate 202, a medium inlet pipe 203 and a medium outlet pipe 204. When the medium is water, the medium inlet pipe 203 is connected to a cold water source, and the medium outlet pipe 204 is connected to another water tank. The heat exchange plates 201 are connected to the back plate 202 in parallel and at intervals. As an implementation method of this embodiment, the heat exchange plates 201 in this embodiment are welded to the back plate 202. As another implementation of this embodiment, the heat exchange plate 201 in this embodiment is slidably mounted on the back plate 202, that is, the spacing between adjacent heat exchange plates 201 is adjustable. As an optional implementation, a parallel first long groove and a second long groove are opened on the back plate 202, and a plug rod 206 is connected to one side wall of the heat exchange plate 201. The plug rod 206 is inserted into the first slot and the free end of the plug rod 206 extends out of the first long groove. A plate 207 is connected to the free end of the plug rod 206, and a bolt 208 is screwed to the end of the plate 207 away from the plug rod 206. The bolt 208 8 is inserted into the second long slot and extends out of the second long slot, a nut is screwed on the bolt 208, the nut and the plate 207 are respectively arranged on both sides of the back plate 202, so that the nut is used to press the plate 207 onto the back plate 202, when adjustment is needed, the nut is loosened, and the plug rod 206 can be driven to move back and forth along the first long slot together with the heat exchange plate 201, thereby adjusting the installation position of the heat exchange plate 201 on the back plate 202, so that the distance between the heat exchange plates 201 of the plug-in plate heat exchange assembly 2 can be adjusted, so that the user can adjust the distance between adjacent heat exchange plates 201 according to the size of the material.

[0041] Since each heat exchange plate 201 is provided with a flow channel, the plug-in heat exchange assembly 2 includes a plurality of flow channels, one end of each flow channel is connected to the medium inlet pipe 203, and the other end of each flow channel is connected to the medium outlet pipe 204. The medium inlet pipe 203 introduces the medium into the heat exchange plate 201 to reduce the temperature of the heat exchange plate 201. When material flows in the above-mentioned logistics channel, the material will contact the surface of the heat exchange plate 201, thereby performing heat exchange, reducing the temperature of the material, and the heated medium flows out from the medium outlet pipe 204.

[0042] A guide structure 205 with a small top and a large bottom is provided at the top of the heat exchange plate 201. The guide structure 205 is actually a body structure with a large top and a small bottom. Since the material flows from top to bottom, the guide structure 205 can reduce the amount of material accumulated on the top of the guide plate, so that the material can flow more smoothly in the cooling box 1.

[0043] The back plate 202 is installed on the side wall of the cooling box 1 by the first screw 3. Specifically, a first window is opened on the side wall of the cooling box 1, and the back plate 202 covers the first window. The edge of the back plate 202 is provided with a first screw 3 hole. The first screw 3 passes through the first screw 3 and is screwed to the side wall of the cooling box 1. To avoid leakage, a first thickening layer is provided on the side wall of the cooling box 1 at a position corresponding to the first screw 3 hole. At this time, the back plate 202 blocks the first window. The medium inlet pipe 203 and the medium outlet pipe 204 are located on one side of the back plate 202, and the heat exchange plate 201 is located on the other side of the back plate 202. Therefore, the medium inlet pipe 203 and the medium outlet pipe 204 are both located outside the cooling box 1 for easy connection.

[0044] An optional implementation of this embodiment is as follows: the heat exchange plate 201 in this embodiment is welded and fixed on the back plate 202, a second window is opened in the middle of the back plate 202, and a third window is opened on the side wall of the cooling box 1, the third window is arranged opposite to the second window, and the first blocking plate 5 and the second blocking plate 6 are respectively installed at the second window and the third window by the second screw 4, the first blocking plate 5 blocks the second window, and the second blocking plate 6 blocks the third window, and an air outlet pipe 7 is connected to the middle of the first blocking plate 5 and the second blocking plate 6, and the air outlet pipe 7 is connected to the inside of the cooling box 1. At this time, the two air outlet pipes 7 constitute the above-mentioned air outlet channel, and the two air outlet pipes 7 are respectively connected to the above-mentioned suction fan through a pipeline. Specifically, a connecting flange is provided at the free end of the two air outlet pipes 7 for connecting to the pipeline. This structure makes the arrangement of the above-mentioned air outlet channel more reasonable, and makes the structure of the entire negative pressure cooling device more compact and occupies a smaller space volume. The flow rate of the above-mentioned air outlet channel is the sum of the flow rates of the two air outlets.

[0045] The air intake channel in this embodiment includes four air intake ports opened on the side wall of the cooling box 1, and the flow rate of the above-mentioned air intake channel is the sum of the air intake flow rates of the four air intake ports. An air intake pipe 8 is installed at each air intake port, and each air intake pipe 8 is connected to the above-mentioned cold air source through an air pipe. Two of the four air intake ports are located on both sides of the upper part of the cooling box 1, and the other two air intake ports are located on both sides of the lower part of the cooling box 1. The two air intake ports located on the upper part of the cooling box 1 are defined as the upper inlet, and the two air intake ports located on the lower part of the cooling box 1 are defined as the lower inlet, and the above-mentioned air outlet pipe 7 is located between the upper inlet and the lower inlet. In this way, not only can the cold air enter the cooling box 1 from multiple angles, so that the temperature of each area inside the cooling box 1 is more balanced, but also the air outlet pipe 7 is arranged between the upper inlet and the lower inlet, so that the outflow path of the cold air is longer, so that the cold air can be fully heat exchanged before being drawn away.

[0046] Optionally, a screen 9 is installed at the air inlet and in the air outlet pipe 7 to prevent materials from entering.

[0047] The air inlet pipe 8 in this embodiment can be welded or detachably connected to the side wall at the air inlet.

[0048] Another optional implementation of this embodiment is as follows: a semicircular outer convex plate 103 is provided at a position corresponding to the air inlet on the cooling box 1. It is worth noting that the air inlet is actually a through hole opened on the side wall of the cooling box 1, and the semicircular outer convex plate 103 is fixedly connected to the outer wall of the cooling box 1 and covers the air inlet. And the center line of the semicircular outer convex plate 103 is located on the side close to the inside of the cooling box 1. Specifically, the semicircular outer convex plate 103 can be processed on the side wall of the cooling box 1 by a die-casting process during sheet metal processing. At this time, the inner concave hole of the semicircular outer convex plate 103 is the air inlet. The screen 9 at the air inlet is installed on the inner wall of the cooling box 1 and covers the inner concave hole of the semicircular outer convex plate 103. At this time, an air inlet chamber 104 is formed between the semicircular outer convex plate 103 and the screen 9. Both ends of the semicircular outer convex plate 103 are blocked, and a round through hole is opened at one end of the semicircular outer convex plate 103, and the round through hole is the inlet of the above-mentioned air inlet chamber 104. The above-mentioned air inlet pipe 8 is rotatably inserted into the inlet, and the part of the air inlet pipe 8 inserted in the air inlet chamber 104 is defined as the air outlet section, and a plurality of air vents 801 are opened on the pipe wall of the air outlet section. Through the above structure, the air inlet pipe 8 in this embodiment can be rotated in the above-mentioned air inlet chamber 104. When the air inlet pipe 8 is rotated, the number of the air vents 801 blocked by the above-mentioned semicircular outer convex plate 103 changes. For example, in the initial state, the rotation angle of the air intake pipe 8 is zero, at which time, the number of vents 801 assisted by the semicircular outer convex plate 103 is zero; the air intake pipe 8 is driven to rotate clockwise / counterclockwise by an angle of α, at which time the number of vents 801 blocked by the semicircular outer convex plate 103 is S, 0≤α≤360°, 0≤S≤100. In fact, 100 vents 801 are evenly distributed in the general area of ​​the air outlet section, and the outer diameter of the air outlet section is adapted to the inner diameter of the semicircular outer convex tube. When the air outlet section is inserted into the air intake chamber 104, the outer wall of the air outlet section is in close contact with the inner wall of the semicircular outer convex tube. When the air intake pipe 8 rotates zero degrees, the area without the vent holes 801 corresponds exactly to the semicircular convex tube, and no vent holes 801 are blocked at this time. When the air intake pipe 8 rotates a certain angle, some of the vent holes 801 rotate to the position corresponding to the semicircular convex tube and are blocked by the semicircular convex tube.

[0049] With this structure, the user can control the number of the connected vents 801 by rotating the air intake pipe 8. When the number of the connected vents 801 is greater, the amount of cold air entering the cooling box 1 per unit time is greater, and when the number of the connected vents 801 is less, the amount of cold air entering the cooling box 1 per unit time is less. By controlling the number of the connected vents 801, the amount of cold air entering the cooling box 1 per unit time is adjusted, thereby controlling the cooling efficiency in the cooling box 1.

[0050] Optionally, a first annular groove is provided on the pipe wall of the air intake pipe 8, and a second annular groove is provided on the side wall of the inlet. The first annular groove and the second annular groove are spliced ​​to form a sealing ring installation groove, and a rubber sealing ring 10 is installed in the sealing ring installation groove. The sealing effect of the rubber sealing ring 10 is utilized to prevent leakage from occurring in the gap between the air intake pipe 8 and the inlet. Moreover, the rubber sealing ring 10 can reduce vibration to a certain extent.

[0051] A reference rod 11 is connected to the air intake pipe 8 outside the air intake chamber 104 . With the help of the reference rod 11 , a user can conveniently measure the rotation angle of the air intake pipe 8 to know the number of the connected air holes 801 .

[0052] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A negative pressure material cooling device, characterized in that: include: A cooling box, wherein a feed port and a discharge port are respectively provided at the top and the bottom of the cooling box, and an air inlet channel connected to a cold air source and an air outlet channel connected to a suction fan are provided on the side wall of the cooling box, the flow rate of the air inlet channel is A, the flow rate of the air outlet channel is B, T=BA, wherein 5m³ / h≤T≤20m³ / h; A plug-in plate heat exchange assembly is installed on the side wall of the cooling box. The plug-in plate heat exchange assembly includes a plurality of heat exchange plates with flow channels therein. The plurality of heat exchange plates are inserted into the cooling box. A logistics channel is formed between the heat exchange plate and the side wall of the cooling box and between two adjacent heat exchange plates. The direction of the logistics channel is in the up-down direction. The plug-in plate heat exchange assembly also includes a back plate, a medium inlet pipe and a medium outlet pipe, a plurality of the heat exchange plates are connected to the back plate in parallel and at intervals, one end of the flow channels of the plurality of the heat exchange plates are connected to the medium inlet pipe, and the other end of the flow channels of the plurality of the heat exchange plates are connected to the medium outlet pipe, a first window is opened on the side wall of the cooling box, the back plate is detachably mounted on the side wall of the cooling box by a first screw and blocks the first window, and the medium inlet pipe and the medium outlet pipe are both located outside the cooling box; A first long groove and a second long groove are parallelly provided on the back plate, a plug rod is connected to a side wall of the heat exchange plate, the plug rod is inserted into the first slot and the free end of the plug rod extends out of the first long groove, a plate is connected to the free end of the plug rod, a bolt is screwed to an end of the plate away from the plug rod, the bolt is inserted into the second long groove and extends out of the second long groove, a nut is screwed to the bolt, and the nut and the plate are respectively arranged on both sides of the back plate; A second window is provided on the back plate, and a third window is provided on the side wall of the cooling box, the second window and the third window are arranged opposite to each other, and a first blocking plate and a second blocking plate are respectively installed at the second window and the third window by second screws, an air outlet pipe is connected to each of the first blocking plate and the second blocking plate, the two air outlet pipes constitute the air outlet channel, and the two air outlet pipes are connected to the suction fan; The air inlet passage comprises four air inlets opened on the side wall of the cooling box, each of the air inlets is equipped with an air inlet pipe, and the four air inlet pipes are respectively connected to the cold air source through an air pipe; Screens are installed at the air inlet and in the air outlet pipe to prevent materials from entering; A semicircular outer convex plate is provided at a position corresponding to the air inlet on the cooling box, an air inlet chamber is formed between the screen and the semicircular outer convex plate, an inlet of the air inlet chamber is provided at one end of the semicircular outer convex plate, the air inlet pipe is rotatably inserted into the inlet and the air inlet pipe extends into the air inlet chamber, the portion of the air inlet pipe extending into the air inlet chamber is an air outlet section, the end of the air outlet section is closed and a plurality of air vents are provided on the pipe wall of the air outlet section; When the air inlet pipe is rotated, the number of the air holes blocked by the semicircular outer convex plate changes.

2. A negative pressure material cooling device according to claim 1, characterized in that: Two of the four air inlets are respectively located on both sides of the upper part of the cooling box, and the other two air inlets are respectively located on both sides of the lower part of the cooling box. The two air inlets located on the upper part of the cooling box constitute an upper inlet, and the two air inlets located on the lower part of the cooling box constitute a lower inlet, and the air outlet pipe is located between the upper inlet and the lower inlet.

3. A negative pressure material cooling device according to claim 1, characterized in that: A first annular groove is provided on the pipe wall of the air inlet pipe, a second annular groove is provided on the side wall of the inlet, the first annular groove and the second annular groove are spliced ​​to form a sealing ring installation groove, and a rubber sealing ring is installed in the sealing ring installation groove.

4. A negative pressure material cooling device according to claim 3, characterized in that: A reference rod is connected to the air intake pipe outside the air intake chamber.

5. A negative pressure material cooling device according to any one of claims 1 to 4, characterized in that: The top of the heat exchange plate is provided with a flow guiding structure which is smaller at the top and larger at the bottom.

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