A heat treatment continuous production line with rapid cooling function

Abstract

The utility model relates to mechanical manufacturing technical field and disclose a heat treatment continuous production line with quick cooling function, including box, the outer wall fixed mounting of box has the guide plate, the outer wall fixed mounting of guide plate has the first air cylinder, the outer wall of guide plate has seted up the guide groove, the inner wall sliding connection of guide groove has the support frame, the outer wall fixed mounting of support frame has the placement platform, the outer wall of box is equipped with the production line conveyor belt, through utilizing the second cylinder drive bellows reciprocating motion in cyclone subassembly, and drive the fan blade rotation makes the cooling medium produce cyclone, its medium is in the state of rotation, makes medium can more evenly contact workpiece surface, avoids appearing local cooling insufficient or overcooling situation, secondly to the workpiece of irregular shape, the medium of rotation also can wash the workpiece from each direction, makes the cooling speed of different parts tend to be consistent, to this convenient for the efficiency of cooling is promoted.

Description

Technical Field

[0001] This utility model relates to the field of mechanical manufacturing technology, specifically a continuous heat treatment production line with rapid cooling function. Background Technology

[0002] In modern industrial production, heat treatment is a key process for improving the performance of metallic materials and is widely used in fields such as machinery manufacturing, aerospace, and automotive industries. The rapid cooling process after heat treatment plays a decisive role in the microstructure and mechanical properties of the workpiece, directly affecting the quality and service life of the product.

[0003] Existing continuous heat treatment production lines generally use static cooling media to cool workpieces. Due to the lack of flow of the cooling media, the heat exchange efficiency between different parts of the workpiece surface and the cooling media is easily significantly different, resulting in local undercooling or overcooling. This leads to large thermal stress inside the workpiece, causing quality defects such as deformation and cracking. Therefore, we have introduced a continuous heat treatment production line with rapid cooling function. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a continuous heat treatment production line with rapid cooling function, which has the advantages of medium swirling and boiling cooling, thus solving the problems mentioned in the background technology.

[0005] This utility model provides the following technical solution: a continuous heat treatment production line with rapid cooling function, including a box body, a guide plate fixedly installed on the outer wall of the box body, a first cylinder fixedly installed on the outer wall of the guide plate, a guide groove opened on the outer wall of the guide plate, a support frame slidably connected to the inner wall of the guide groove, a placement platform fixedly installed on the outer wall of the support frame, a production line conveyor belt provided on the outer wall of the box body, a workpiece platform provided on the top of the placement platform, a first controller provided on the outer wall of the support frame, a water outlet pipe, a water inlet pipe and a second controller respectively provided on the outer wall of the box body, and a vortex assembly and a boiling assembly provided on the outer wall of the box body;

[0006] The cyclone assembly includes a second cylinder, the bottom of which is provided with a corrugated telescopic tube. The outer wall of the housing is fixedly fitted with a base plate and a mounting plate. The inner wall of the mounting plate is rotatably sleeved with a first rotating shaft. The outer wall of the first rotating shaft is fixedly installed with a pulley. The inner wall of the housing is rotatably connected with a second rotating shaft. The top of the second rotating shaft is fixedly sleeved with a fan blade. The outer wall of the fan blade is provided with a steel wire rope. The bottom of the production line conveyor belt is fixedly installed with a second cylinder.

[0007] As a preferred technical solution of this utility model: the production line conveyor belt is correspondingly arranged with the placement platform, the support frame is electrically connected to the first cylinder, the top of the workpiece platform is provided with holes, and the number of holes is several, the water outlet pipe is connected to the water outlet of the box, and the water inlet pipe is connected to the water inlet of the box.

[0008] As a preferred technical solution of this utility model: one end of the corrugated telescopic tube is connected to the telescopic end of the second cylinder, and the other end is connected to the bottom of the base plate; one end of the wire rope is connected to the outer wall of the second rotating shaft, and the other end passes through the corrugated telescopic tube to the inner wall of the base plate and the corrugated telescopic tube; the angle of contact between the wire rope and the pulley is ninety degrees.

[0009] As a preferred technical solution of this utility model: the swirl assembly is regarded as a set of movable components, and the number of the movable components is two sets, which are arranged in opposite directions. The two second cylinders are electrically connected to the second controller.

[0010] As a preferred technical solution of this utility model: the boiling component includes an air pipe, an installation head is rotatably sleeved on the outer wall of the air pipe, a conveying pipe is provided on the outer wall of the box, a base is fixedly installed on the inner wall of the conveying pipe, a ball and a spring are respectively provided in the inner cavity of the conveying pipe, and an air hole is opened on the outer wall of the conveying pipe.

[0011] As a preferred technical solution of this utility model: one end of the air pipe is connected to the air outlet of the corrugated telescopic pipe, and the other end is connected to the air inlet of the conveying pipe. The conveying pipe is connected to the air inlet of the box. There are three air holes, and the three conveying pipes are arranged parallel to each other on the outer wall of the conveying pipe. The diameter of the sphere is larger than the diameter of the air inlet of the conveying pipe. The spring is located at the bottom of the sphere, and one end overlaps with the outer wall of the sphere, and the other end overlaps with the outer wall of the base.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. This continuous heat treatment production line with rapid cooling function utilizes the second cylinder in the swirl assembly to drive the corrugated telescopic tube to reciprocate, thereby causing the fan blades to rotate and generating a swirling flow of the cooling medium. The medium is in a rotating state, which allows it to contact the workpiece surface more evenly, avoiding localized insufficient or excessive cooling. Furthermore, for workpieces with irregular shapes, the rotating medium can also wash the workpiece from all directions, making the cooling rate of different parts tend to be consistent, thus improving the cooling efficiency.

[0014] 2. This continuous heat treatment production line with rapid cooling function uses a boiling component to generate bubbles in the cooling medium by compressing air in a swirl component. The bubbles are pushed by the gas to open the air inlet of the conveying pipe and drive the spring to compress. The gas is then exhausted through three air holes on the outer wall of the conveying pipe. As the bubbles continue to burst, the cooling medium on the surface of the workpiece is constantly renewed, further accelerating heat conduction and effectively shortening the cooling time, which is conducive to meeting the high production efficiency requirements of modern industry. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a schematic cross-sectional view of the cyclone assembly of this utility model;

[0017] Figure 3 This is a schematic cross-sectional view of the boiling component of this utility model;

[0018] Figure 4 This utility model Figure 2 Enlarged structural diagram at point A in the middle;

[0019] Figure 5 This utility model Figure 3 Enlarged structural diagram at point B.

[0020] In the diagram: 1. Box body; 2. Guide plate; 3. First cylinder; 4. Guide groove; 5. Support frame; 6. Placement platform; 7. Production line conveyor belt; 8. Workpiece platform; 9. First controller; 10. Water outlet pipe; 11. Water inlet pipe; 12. Second controller; 13. Swirl assembly; 14. Boiling assembly; 131. Second cylinder; 132. Corrugated telescopic pipe; 133. Base plate; 134. Mounting plate; 135. Rotating shaft one; 136. Pulley; 137. Rotating shaft two; 138. Fan blade; 139. Steel wire rope; 141. Air pipe; 142. Mounting head; 143. Conveying pipe; 144. Ball; 145. Spring; 146. Base; 147. Air hole. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1 - Figure 5A continuous heat treatment production line with rapid cooling function includes a housing 1, a guide plate 2 fixedly installed on the outer wall of the housing 1, a first cylinder 3 fixedly installed on the outer wall of the guide plate 2, a guide groove 4 opened on the outer wall of the guide plate 2, a support frame 5 slidably connected to the inner wall of the guide groove 4, a placement platform 6 fixedly installed on the outer wall of the support frame 5, a production line conveyor belt 7 provided on the outer wall of the housing 1, a workpiece platform 8 provided on the top of the placement platform 6, a first controller 9 provided on the outer wall of the support frame 5, a water outlet pipe 10, a water inlet pipe 11 and a second controller 12 respectively provided on the outer wall of the housing 1, and a swirl assembly 13 and a boiling assembly 14 provided on the outer wall of the housing 1.

[0023] The cyclone assembly 13 includes a second cylinder 131. The bottom of the second cylinder 131 is provided with a corrugated telescopic tube 132. The outer wall of the housing 1 is fixedly equipped with a base plate 133 and a mounting plate 134. The inner wall of the mounting plate 134 is rotatably sleeved with a first rotating shaft 135. The outer wall of the first rotating shaft 135 is fixedly installed with a pulley 136. The inner wall of the housing 1 is rotatably connected with a second rotating shaft 137. The top of the second rotating shaft 137 is fixedly sleeved with a fan blade 138. The outer wall of the fan blade 138 is provided with a wire rope 139. The bottom of the production line conveyor belt 7 is fixedly installed with the second cylinder 131.

[0024] In the above structure, by setting the vortex assembly 13, the workpiece on the top of the workpiece platform 8 is conveyed to the top of the placement table 6 via the production line conveyor belt 7. At this time, the workpiece platform 8 is fixed by the existing device fixing process. Then, the start button is pressed to trigger the transmission signal of the first controller 9, which in turn transmits the transmission signal to the first cylinder 3. The telescopic end of the first cylinder 3 drives the support frame 5 to slide along the inner wall of the guide groove 4. The sliding support frame 5 drives the placement table 6 and the workpiece platform 8 fixed on the top of the placement table 6, causing the workpiece to move accordingly. After the support frame 5 slides into the inner cavity of the box 1, the cooling medium in the inner cavity of the box 1 cools and shapes the workpiece. At this time, when the workpiece is cooling, the second controller is activated. Switch 12 causes the swirling assembly 13 to send a start signal to its second cylinder 131. This causes the corrugated telescopic tube 132 to move up and down continuously through the second cylinder 131. The wire rope 139 then drives the rotating shaft 137 to rotate due to the up-and-down movement of the corrugated telescopic tube 132. At this time, the fan blades 138 operate synchronously with the rotation of the rotating shaft 137. As the fan blades 138 rotate, they drive the cooling medium in the inner cavity of the housing 1, causing the cooling medium to swirl. This swirling medium will evenly contact the surface of the workpiece, thus avoiding localized insufficient or excessive cooling of the workpiece. At the same time, the swirling medium will also generate turbulence and break the thermal boundary layer on the surface of the workpiece, thereby accelerating the transfer of heat from the workpiece to the cooling medium and improving the rapid cooling of the workpiece.

[0025] In a preferred embodiment: the production line conveyor belt 7 is correspondingly arranged with the placement platform 6, the support frame 5 is electrically connected to the first cylinder 3, the top of the workpiece platform 8 is provided with holes, and the number of holes is several, the water outlet pipe 10 is connected to the water outlet of the box 1, and the water inlet pipe 11 is connected to the water inlet of the box 1.

[0026] In the above structure, the production line conveyor belt 7 and the placement platform 6 are arranged so that the workpiece is transported to the top of the placement platform 6 via the production line conveyor belt 7, which facilitates the workpiece entering the cooling area. At the same time, the support frame 5 and the first cylinder 3 are arranged so that by activating the switch button of the support frame 5, the support frame 5 will transmit its start signal to the first cylinder 3, thereby activating the transmission of the first cylinder 3. The workpiece platform 8 is arranged so that the workpiece on the top of the workpiece platform 8 is cooled by the medium in the inner cavity of the box 1. The cooling medium is cooled by several holes opened on the top of the workpiece platform 8. The water outlet pipe 10 and the water inlet pipe 11 are arranged so that the water inlet pipe 11 first delivers the cooling medium into the inner cavity of the box 1 through an external transmission device. Then, when the cooling medium in the inner cavity of the box 1 needs to be replaced, the water outlet pipe 10 is connected to the extraction device to extract the cooling medium in the inner cavity of the box 1, which facilitates the replacement of the cooling medium in the inner cavity of the box 1.

[0027] In a preferred embodiment: one end of the corrugated telescopic tube 132 is connected to the telescopic end of the second cylinder 131, and the other end is connected to the bottom of the base plate 133; one end of the wire rope 139 is connected to the outer wall of the rotating shaft 137, and the other end passes through the corrugated telescopic tube 132 to the inner wall of the base plate 133 and the corrugated telescopic tube 132; the angle of contact between the wire rope 139 and the pulley 136 is ninety degrees.

[0028] In the above structure, by setting the corrugated telescopic tube 132 and the steel wire rope 139, the corrugated telescopic tube 132 is initially in a compressed state, while the second cylinder 131 is in a telescopic state. Furthermore, a pre-installed steel wire rope 139 is provided on the outer wall of the second rotating shaft 137. After the workpiece enters the inner cavity of the housing 1, it activates the start switch of the second controller 12. The second controller 12 then transmits its start signal to the two second cylinders 131, thereby enabling the two second cylinders 131 to... The transmission causes the second cylinder 131 to synchronously extend and reset during its reset transmission, driving the corrugated telescopic tube 132 connected to its bottom telescopic end. Air enters the inner cavity of the resetting corrugated telescopic tube 132 through the air intake valve installed in the existing device. Simultaneously, as the corrugated telescopic tube 132 extends, it stretches one end of the steel wire rope 139 connected to its inner wall, causing the outer wall of the steel wire rope 139 to adhere to the outer wall of the pulley 136 during this stretching process. The pulley 136 rotates, and the steel wire rope 139, which is pre-installed on the outer wall of the second rotating shaft 137, is stretched at the other end, causing the second rotating shaft 137 to rotate. This rotating shaft 137 then drives the fan blade 138, which is fixedly sleeved at the top, to rotate clockwise. The rotating fan blade 138 then drives the medium inside the housing 1 to rotate, thus creating a swirling flow. Meanwhile, after the second cylinder 131 reaches its highest point, it returns to its starting position. At this time, the returning second cylinder 131 drives the corrugated extension at the bottom to extend... The compression tube 132 is compressed, causing the intake valve of the second cylinder 131 to close during compression, allowing the compressed air inside the cylinder to be discharged from the outlet. As the corrugated telescopic tube 132 moves downward, one end of the wire rope 139 will be in a slack state. The slack wire rope 139 is then pulled to one end by the rotational characteristics of the rotating shaft 137, causing it to contract and touch the outer wall of the shaft 137, thus restoring the wire rope 139 to its initial state.

[0029] In a preferred embodiment: the swirl assembly 13 is regarded as a group of movable components, and the number of such movable components is two groups, which are arranged in opposite directions. The two second cylinders 131 are electrically connected to the second controller 12 respectively.

[0030] In the above structure, by setting the swirl assembly 13 and the second controller 12, the second controller 12 transmits start signals to the second cylinders 131 in the two sets of swirl assemblies 13, so that the second cylinders 131 in the two sets of swirl assemblies 13 can achieve the number of reciprocating movements through the number of transmission start times preset by the second controller 12, thereby realizing the synchronous operation and transmission of the two sets of opposite swirl assemblies 13.

[0031] In a preferred embodiment: the boiling component 14 includes an air pipe 141, an installation head 142 is rotatably sleeved on the outer wall of the air pipe 141, a conveying pipe 143 is provided on the outer wall of the housing 1, a base 146 is fixedly installed on the inner wall of the conveying pipe 143, a ball 144 and a spring 145 are respectively provided in the inner cavity of the conveying pipe 143, and an air hole 147 is opened on the outer wall of the conveying pipe 143.

[0032] In a preferred embodiment: one end of the air pipe 141 is connected to the air outlet of the corrugated telescopic pipe 132, and the other end is connected to the air inlet of the conveying pipe 143. The conveying pipe 143 is connected to the air inlet of the housing 1. There are three air holes 147, and the three conveying pipes 143 are arranged parallel to each other on the outer wall of the conveying pipe 143. The diameter of the sphere 144 is larger than the diameter of the air inlet of the conveying pipe 143. The spring 145 is located at the bottom of the sphere 144, and one end overlaps with the outer wall of the sphere 144, and the other end overlaps with the outer wall of the base 146.

[0033] In the above structure, by configuring the air pipe 141, the delivery pipe 143, the sphere 144, the spring 145, and the air hole 147, when the corrugated telescopic pipe 132 compresses air, the compressed air is transmitted through the air outlet to the delivery pipe 143 via the air pipe 141. The sphere 144, located at the air inlet of the delivery pipe 143, will displace under the compression of the gas. This displacement of the sphere 144 will cause the spring 145 to compress, thereby opening the air inlet of the delivery pipe 143, allowing the gas to be transmitted through the delivery pipe 143 to the medium inside the housing 1. The gas is discharged through the air holes 147 parallel to the outer wall of the conveying pipe 143, causing the medium to generate bubbles under the filling of gas. As the workpiece cools, the medium in the chamber 1 that generates bubbles will boil, causing the bubbles in the medium to continuously burst, thereby continuously breaking the boundary layer of the cooling medium on the surface of the workpiece. This allows fresh cooling medium to continuously contact the workpiece, accelerating heat conduction. In the absence of gas filling, the sphere 144 will be reset and fixed to the air inlet of the conveying pipe 143 by the spring 145, thereby preventing the medium in the chamber 1 from flowing back.

[0034] Working principle: In the first preparation stage, the water inlet pipe 11 is connected to an external transmission device to transport the cooling medium into the inner cavity of the box 1, providing medium conditions for cooling the workpiece. At the same time, in the initial state, the corrugated telescopic pipe 132 is in a compressed state, the second cylinder 131 is in a telescopic state, and the outer wall of the rotating shaft 137 is reserved with a steel wire rope 139.

[0035] In the next working stage, the heat-treated workpiece is placed on the workpiece platform 8 and transported by the production line conveyor belt 7 to the position corresponding to the placement table 6. At this time, the workpiece platform 8 is fixed by the existing fixing device. Then, the operator presses the start button to trigger the transmission signal of the first controller 9, which transmits the signal to the first cylinder 3. The extension end of the first cylinder 3 drives the support frame 5 to slide along the inner wall of the guide groove 4 on the guide plate 2. The support frame 5 then drives the placement table 6, the workpiece platform 8, and the workpiece to move synchronously until the workpiece platform 8 and the workpiece on it are placed. The workpiece is fed into the inner cavity of the housing 1. After the workpiece enters the inner cavity of the housing 1, the operator activates the switch of the second controller 12. The second controller 12 sends a start signal to the second cylinder 131 in the two sets of vortex assemblies 13. Upon receiving the signal, the second cylinder 131 begins to reset and drive, and drives the corrugated telescopic tube 132 connected to the bottom to reset and extend synchronously. This allows air to enter the inner cavity of the corrugated telescopic tube 132 through the existing fixed air inlet valve. At the same time, its extension action causes one end of the steel wire rope 139 connected to the inner wall to stretch, so that when the steel wire rope 139 is stretched, its outer wall adheres to the pulley 136. The second cylinder 131 rotates, causing the pulley 136 to rotate, which in turn pulls the steel wire rope 139 pre-installed on the outer wall of the second rotating shaft 137, causing the second rotating shaft 137 to rotate. The rotation of the second rotating shaft 137 causes the fan blade 138, which is fixedly sleeved at the top, to rotate clockwise. The rotation of the fan blade 138 causes the cooling medium in the inner cavity of the housing 1 to generate swirling flow, so that the cooling medium is evenly contacted with the surface of the workpiece, avoiding insufficient or excessive cooling of the workpiece in some areas. At the same time, the turbulence generated also breaks the thermal boundary layer on the surface of the workpiece, accelerating the heat transfer speed. When the second cylinder 131 reaches the high point, it begins to return, driving the corrugated extension at the bottom. When the bellows expansion tube 132 is compressed, the air inlet valve of the existing device assembled with the bellows expansion tube 132 is closed, and the air in its inner cavity is compressed and discharged from the air outlet. This causes the steel wire rope 139 of the bellows expansion tube 132 to be in a slack state when it moves downward. Under the action of the rotation characteristics of the second rotating shaft 137, the steel wire rope 139 is retracted back to the outer wall of the second rotating shaft 137 and restored to the initial state. Then, the second cylinder 131 in the two sets of vortex components 13 realizes reciprocating motion according to the number of transmission start times preset by the second controller 12, so as to ensure the continuity and stability of the vortex effect.

[0036] During the above process, when the corrugated expansion tube 132 compresses air, the compressed air is transmitted through the air outlet to the conveying pipe 143 via the air pipe 141. The sphere 144 set at the air inlet of the conveying pipe 143 is displaced under the action of gas pressure, which drives the spring 145 to compress, thereby opening the air inlet of the conveying pipe 143. The gas is transmitted through the conveying pipe 143 to the medium in the inner cavity of the housing 1, and is discharged through the three parallel air holes 147 on the outer wall of the conveying pipe 143. The discharged gas reacts with the medium to generate bubbles, presenting a boiling state. As the bubbles continuously burst, they continuously destroy the boundary layer of the cooling medium on the surface of the workpiece, allowing fresh cooling medium to continuously contact the workpiece, further accelerating the heat conduction process, thereby improving the cooling effect on the workpiece.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A continuous heat treatment production line with rapid cooling function, comprising a housing (1), characterized in that: A guide plate (2) is fixedly installed on the outer wall of the box (1). A first cylinder (3) is fixedly installed on the outer wall of the guide plate (2). A guide groove (4) is opened on the outer wall of the guide plate (2). A support frame (5) is slidably connected to the inner wall of the guide groove (4). A placement platform (6) is fixedly installed on the outer wall of the support frame (5). A production line conveyor belt (7) is provided on the outer wall of the box (1). A workpiece platform (8) is provided on the top of the placement platform (6). A first controller (9) is provided on the outer wall of the support frame (5). A water outlet pipe (10), a water inlet pipe (11), and a second controller (12) are respectively provided on the outer wall of the box (1). A swirl assembly (13) and a boiling assembly (14) are provided on the outer wall of the box (1). The swirl assembly (13) includes a second cylinder (131), the bottom of which is provided with a corrugated telescopic tube (132). The outer wall of the housing (1) is fixedly fitted with a base plate (133) and a mounting plate (134). The inner wall of the mounting plate (134) is rotatably sleeved with a first rotating shaft (135). The outer wall of the first rotating shaft (135) is fixedly installed with a pulley (136). The inner wall of the housing (1) is rotatably connected with a second rotating shaft (137). The top of the second rotating shaft (137) is fixedly sleeved with a fan blade (138). The outer wall of the fan blade (138) is provided with a wire rope (139). The bottom of the production line conveyor belt (7) is fixedly installed with a second cylinder (131).

2. The continuous heat treatment production line with rapid cooling function according to claim 1, characterized in that: The production line conveyor belt (7) is set in correspondence with the placement platform (6), the support frame (5) is electrically connected to the first cylinder (3), the top of the workpiece platform (8) is provided with holes, and the number of holes is several, the water outlet pipe (10) is connected to the water outlet of the box (1), and the water inlet pipe (11) is connected to the water inlet of the box (1).

3. A continuous heat treatment production line with rapid cooling function according to claim 1, characterized in that: One end of the corrugated telescopic tube (132) is connected to the telescopic end of the second cylinder (131), and the other end is connected to the bottom of the base plate (133). One end of the wire rope (139) is connected to the outer wall of the rotating shaft (137), and the other end passes through the corrugated telescopic tube (132) to the inner wall of the base plate (133) and the corrugated telescopic tube (132). The angle of contact between the wire rope (139) and the pulley (136) is 90 degrees.

4. A continuous heat treatment production line with rapid cooling function according to claim 1, characterized in that: The swirl assembly (13) is considered as a set of active components, and the number of such active components is two sets, which are arranged in opposite directions. The two second cylinders (131) are electrically connected to the second controller (12).

5. A continuous heat treatment production line with rapid cooling function according to claim 1, characterized in that: The boiling component (14) includes an air pipe (141), the outer wall of which is rotatably fitted with an installation head (142), the outer wall of the housing (1) is provided with a delivery pipe (143), the inner wall of the delivery pipe (143) is fixedly installed with a base (146), the inner cavity of the delivery pipe (143) is provided with a ball (144) and a spring (145), and the outer wall of the delivery pipe (143) is provided with an air hole (147).

6. A continuous heat treatment production line with rapid cooling function according to claim 5, characterized in that: One end of the air pipe (141) is connected to the air outlet of the corrugated telescopic pipe (132), and the other end is connected to the air inlet of the conveying pipe (143). The conveying pipe (143) is connected to the air inlet of the box (1). There are three air holes (147), and the three conveying pipes (143) are arranged parallel to each other on the outer wall of the conveying pipe (143). The diameter of the sphere (144) is larger than the diameter of the air inlet of the conveying pipe (143). The spring (145) is located at the bottom of the sphere (144), and one end overlaps with the outer wall of the sphere (144), and the other end overlaps with the outer wall of the base (146).

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