A moisture-proof and dust-removing device for electronic components

Abstract

This utility model provides a moisture-proof and dust-removing device for electronic components, relating to the technical field of electronic component processing equipment. It includes a processing cabinet with a processing chamber and an equipment chamber inside. Two pairs of mounting rods are fixedly connected inside the processing chamber, and multiple placement plates are fixedly installed between the two pairs of mounting rods. This device uses a clamping mechanism to clamp and fix the electronic components, ensuring that they do not shift due to suction or other external forces during moisture-proof and dust-removing treatment, thus avoiding surface scratches or physical damage caused by collisions. Furthermore, by incorporating a cleaning mechanism to clean the surface of the electronic components, dust adhering to the surface can be removed more effectively, improving cleaning efficiency and effectiveness.

Description

Technical Field

[0001] This utility model relates to the technical field of electronic component processing equipment, specifically a moisture-proof and dust-removing device for electronic components. Background Technology

[0002] Electronic components are the building blocks of electronic parts and small machines and instruments. They are usually composed of several parts and can be used interchangeably in similar products. If electronic components are left for too long, moisture in the air can easily enter them, and dust can accumulate on them. Therefore, moisture prevention and dust removal for electronic components are particularly important, and people have increasingly higher requirements for moisture prevention and dust removal devices. Existing methods for moisture prevention and dust removal of electronic components often require the use of desiccants and manual wiping of the electronic components to remove dust. Such operations are time-consuming, labor-intensive, and have poor moisture prevention and dust removal effects.

[0003] A search revealed a Chinese patent publication number, CN202221998295.2, entitled "High-Efficiency Moisture-Proof and Dust-Removing Device for Electronic Components." This device uses a vertical plate and a placement block to adjust the position of the placement plate, and an air pump and a suction plate to dry the internal cavity of the enclosure. The overall device is simple in structure, easy to operate, and inexpensive, offering good dust removal and protection for electronic components, making it highly practical. However, some shortcomings exist in actual use. When removing dust and moisture from electronic components, this device directly... The components are placed on a shelf, and then the suction plate draws air to remove the dust from the electronic components. First, the electronic components lack a fixed position, and some lighter electronic components move under the suction, causing collisions between them. This results in many scratches or damage to the surface of the electronic components, especially under the action of external force, making the electronic components more prone to movement. In addition, the cleaning effect of airflow to remove dust from the surface of electronic components is not very good, and some dust will remain on the electronic components, requiring manual wiping of the dust later. Utility Model Content

[0004] The purpose of this application is to provide a moisture-proof and dust-removing device for electronic components, so as to solve the technical problems of poor fixation and cleaning effect of electronic components in the prior art.

[0005] To achieve the above objectives, the technical solution adopted in this application is: to provide a moisture-proof and dust-removing device for electronic components, comprising: a processing cabinet, wherein the processing cabinet is provided with a processing chamber and an equipment chamber, and two pairs of mounting rods are fixedly connected inside the processing chamber, and multiple placement plates are fixedly installed between the two pairs of mounting rods;

[0006] The clamping mechanism is mounted on the placement plate and is used to clamp and fix electronic components. The clamping mechanism includes: a fixed clamping plate, a movable clamping plate, a roller a, a transmission belt a, a connecting block, a moving groove and a rubber plate.

[0007] A cleaning mechanism is located inside the processing chamber and is used to clean dust from electronic components. The cleaning mechanism includes a frame, a roller b, a transmission belt b, a moving plate, a brush plate, and a drive motor.

[0008] Furthermore, multiple fixed clamping plates are fixedly connected to the top of the placement plate, and each fixed clamping plate has a movable clamping plate on one side. Two rollers a are rotatably connected between the inner walls of opposite sides of the bottom of the placement plate, and a transmission belt a is connected between the two rollers a. The top of the two transmission belts a is fixedly connected with a number of connecting blocks matching the movable clamping plates. Two moving grooves are opened on the placement plate, and the two transmission belts a are located directly below the two moving grooves. The top of the connecting block extends into the moving groove and is connected to the opposite movable clamping plate. Rubber plates are fixedly installed on opposite sides of both the fixed clamping plate and the movable clamping plate.

[0009] Furthermore, each of the placement plates is provided with a frame above it, and two rollers b are rotatably connected between the inner walls of the frames on opposite sides. Two transmission belts b are connected between the two rollers b, and multiple movable plates are fixedly connected between the two transmission belts b. Each movable plate is fixedly mounted with a brush plate. A drive motor is fixedly mounted on the front side of the frame, and the drive shaft of the drive motor is connected to one of the rollers b.

[0010] Furthermore, a knob is fixedly connected to the outside of the rotating shaft of one of the rollers a, and a threaded hole a is opened at the bottom of the placement plate near the knob. A fixing bolt is threaded inside the threaded hole a, and the top of the fixing bolt abuts against the outside of the knob of the roller a.

[0011] Furthermore, a lifting plate is provided near the top of the processing chamber. Four connecting rods arranged in a rectangular array are fixedly connected to the bottom of the lifting plate. Connecting holes are distributed at the four corners of the frame. The bottom ends of the four connecting rods pass through the four connecting holes. Each connecting rod is threaded with a limit nut. An electric push rod is fixedly installed on the top of the processing cabinet. The output end of the electric push rod extends into the processing cabinet and connects to the top of the lifting plate.

[0012] Furthermore, the frame has threaded holes b on opposite sides that communicate with the connecting holes. A positioning bolt is threaded inside the threaded hole b, and one end of the positioning bolt extends into the threaded hole b and abuts against the outside of the connecting rod.

[0013] Furthermore, multiple suction tubes are fixedly installed on the inner walls of opposite sides of the processing cabinet, a fixed frame is fixedly installed inside the equipment cavity, a collection frame is slidably connected inside the fixed frame, a dust collection fan is provided on opposite sides of the fixed frame, the output ends of the two dust collection fans are connected to the inside of the fixed frame, the input ends of the two dust collection fans are connected to the multiple suction tubes on both sides through suction pipes, and a filter screen is provided on the front side of the collection frame.

[0014] Furthermore, the processing cabinet has two air inlets on its top, and two boxes are fixedly installed on the top of the processing cabinet. The boxes are equipped with air filters and dehumidification plates. Air supply pipes are fixedly connected to opposite sides of the boxes, and the two air supply pipes are respectively connected to the two air inlets. Air inlet pipes are connected to opposite sides of the boxes, and a heating module is fixedly installed at one end of each air inlet pipe.

[0015] The beneficial effects of this utility model are:

[0016] The advantage of this utility model is that by setting a clamping mechanism to clamp and fix electronic components, it can ensure that electronic components will not be displaced due to suction or other external forces during moisture-proof and dust-removing treatment, thereby avoiding surface scratches or physical damage caused by collision.

[0017] Secondly, by setting up a cleaning mechanism to clean the surface of electronic components, dust adhering to the surface of electronic components can be removed more effectively, improving cleaning effect and efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0020] Figure 2 This is a cross-sectional view of the overall structure of this utility model.

[0021] Figure 3 This is a schematic diagram of the processing cabinet structure of this utility model.

[0022] Figure 4 This is a schematic diagram of the placement plate structure of this utility model.

[0023] Figure 5 This is a schematic diagram of the frame structure of this utility model.

[0024] Figure 6 This is a schematic diagram of the lifting plate structure of this utility model.

[0025] Figure 7 This is a cross-sectional view of the threaded hole b structure of this utility model.

[0026] Figure 8 For the present utility model Figure 2 Enlarged view of point A in the middle.

[0027] Figure 9 For the present utility model Figure 3 Enlarged view of section B in the middle.

[0028] Figure 10 For the present utility model Figure 7 Enlarged view of point C.

[0029] The following are the labeling elements in the figure:

[0030] 1. Processing cabinet; 11. Processing chamber; 12. Equipment chamber; 13. Mounting rod; 14. Placement plate; 2. Fixed clamping plate; 21. Movable clamping plate; 22. Roller a; 23. Drive belt a; 24. Connecting block; 25. Moving groove; 26. Rubber plate; 27. Knob; 28. Threaded hole a; 29. ​​Fixing bolt; 3. Frame; 31. Roller b; 32. Drive belt b; 33. Moving plate; 34. Brush plate; 35. Drive 36. Motor; 37. Lifting plate; 38. Connecting rod; 39. Connecting hole; 30. Limit nut; 310. Electric push rod; 311. Threaded hole b; 312. Positioning bolt; 4. Suction tube; 41. Fixing frame; 42. Collection frame; 43. Dust extraction fan; 44. Filter screen; 5. Air inlet; 51. Box body; 52. Air filter screen; 53. Dehumidification plate; 54. Air supply duct; 55. Air inlet duct; 56. Heating module. Detailed Implementation

[0031] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0032] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0033] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0035] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0036] Example 1

[0037] As attached Figures 1 to 10 The device shown is a moisture-proof and dust-removing device for electronic components, comprising: a processing cabinet 1, the processing cabinet 1 having a processing chamber 11 and an equipment chamber 12 inside, two pairs of mounting rods 13 fixedly connected inside the processing chamber 11, and multiple placement plates 14 fixedly installed between the two pairs of mounting rods 13; a clamping mechanism, the clamping mechanism being disposed on the placement plates 14 for clamping and fixing electronic components; and a cleaning mechanism, the cleaning mechanism being disposed inside the processing chamber 11 for cleaning dust on the electronic components.

[0038] The electronic components are placed on the placement plate 14 and stored in the processing cabinet 1. They are classified according to their type, and electronic components of the same type are placed on the same placement plate 14. The electronic components are clamped and fixed by the clamping mechanism to prevent them from moving under external force, which could cause them to collide and be damaged. The cleaning mechanism can clean the dust on the electronic components to prevent the dust from affecting normal use, and the dust removal efficiency is high.

[0039] Example 2

[0040] Based on Embodiment 1, the solution in Embodiment 1 will be further described in detail below with reference to the specific working method, such as... Figures 1 to 10 As shown below, see details:

[0041] The clamping mechanism includes: a fixed clamping plate 2, a movable clamping plate 21, a roller a22, a transmission belt a23, a connecting block 24, a moving groove 25, and a rubber plate 26. Multiple fixed clamping plates 2 are fixedly connected to the top of the placement plate 14. Movable clamping plates 21 are provided on one side of each fixed clamping plate 2. Two rollers a22 are rotatably connected between the inner walls of opposite sides of the bottom of the placement plate 14. A transmission belt a23 connects the two rollers a22. Connecting blocks 24, matching the number of movable clamping plates 21, are fixedly connected to the top of the two transmission belts a23. Two grooves are formed on the placement plate 14. The movable groove 25 has two transmission belts a23 located directly below it. The top of the connecting block 24 extends into the movable groove 25 and connects to the opposite movable clamping plate 21. Rubber plates 26 are fixedly installed on opposite sides of the fixed clamping plate 2 and the movable clamping plate 21. A rotating shaft of a roller a22 extends to the outside and is fixedly connected to a knob 27. A threaded hole a28 is opened at the bottom of the placement plate 14 near the knob 27. A fixing bolt 29 is threaded inside the threaded hole a28, and the top of the fixing bolt 29 abuts against the outside of the knob 27.

[0042] In this process: When placing electronic components, the same type of electronic components are placed between the fixed clamp 2 and the movable clamp 21. Then, the fixing bolt 29 is loosened, separating one end of the fixing bolt 29 from the knob 27, thus releasing the fixation on the roller a22. The knob 27 is manually turned to drive the connected roller a22 to rotate. The rotation of the roller a22 drives the two transmission belts a23 to move synchronously to the left. The transmission belts a23 drive the movable clamp 21 to move towards the fixed clamp 2 side through the connecting block 24, thereby clamping and fixing the electronic components. Then, the fixing bolt 29 is screwed into the threaded hole a28, so that the top of the fixing bolt 29 abuts against the outside of the knob 27. The knob 27 has anti-slip textures on the outside to increase friction with one end of the fixing bolt 29. Relying on friction... When the roller a22 is fixed, the reaction force generated when the top of the fixing bolt 29 abuts against the rotating shaft will cause the external convex thread of the fixing bolt 29 to fit tightly with the concave thread on the inner wall of the threaded hole a28. The friction between the threads will fix the fixing bolt 29, thereby preventing the rotation of the roller a22 from causing the movable clamping plate 21 to move in the opposite direction and loosen the electronic components. The rubber plate 26 on the opposite side of the fixed clamping plate 2 and the movable clamping plate 21 will protect the electronic components from being pinched and will also increase friction to improve the stability of the clamping and fixing. When the electronic components are removed, the fixing bolt 29 is loosened, and then the knob 27 is turned in the opposite direction to drive the transmission belt a23 to move to the right, so that the movable clamping plate 21 separates from the fixed clamping plate 2, thereby loosening the electronic components.

[0043] Example 3

[0044] Based on Embodiment 1, the solution in Embodiment 1 will be further described in detail below with reference to the specific working method, such as... Figures 1 to 10As shown below, see details:

[0045] The cleaning mechanism includes a frame 3, rollers b31, transmission belts b32, moving plates 33, brush plates 34, and a drive motor 35. A frame 3 is provided above each of the placement plates 14. Two rollers b31 are rotatably connected between the inner walls of opposite sides of the frame 3. Two transmission belts b32 are connected between the two rollers b31. Multiple moving plates 33 are fixedly connected between the two transmission belts b32. Brush plates 34 are fixedly installed on each of the moving plates 33. A drive motor 35 is fixedly installed on the front side of the frame 3. The drive shaft of the drive motor 35 is connected to one of the rollers b31.

[0046] Specifically, when cleaning dust from electronic components, the drive motor 35 is started to rotate the roller b31. When the roller b31 rotates, it drives the two transmission belts b32 to move. When the two transmission belts b32 move, they drive the moving plate 33 and the brush plate 34 to move in a cycle. The brushes of the brush plate 34 are made of antistatic nylon material, which protects sensitive electronic components from electrostatic discharge damage and does not attract dust. The moving brush plate 34 rubs against the surface of the electronic components to remove the dust from them.

[0047] In a preferred embodiment, a lifting plate 36 is provided near the top of the processing chamber 11. Four connecting rods 37 arranged in a rectangular array are fixedly connected to the bottom of the lifting plate 36. Connecting holes 38 are distributed at the four corners of the frame 3. The bottom ends of the four connecting rods 37 pass through the four connecting holes 38. The bottom ends of the connecting rods 37 are threaded with limit nuts 39. An electric push rod 310 is fixedly installed on the top of the processing cabinet 1. The output end of the electric push rod 310 extends into the processing cabinet 1 and connects to the top of the lifting plate 36. Threaded holes b311 that communicate with the connecting holes 38 are respectively opened on opposite sides of the frame 3. A positioning bolt 312 is threadedly connected inside the threaded hole b311. One end of the positioning bolt 312 extends into the threaded hole b311 and abuts against the outside of the connecting rod 37.

[0048] Furthermore, during cleaning, the electric push rod 310 is pushed downwards, causing the lifting plate 36 and connecting rod 37 to move downwards. The connecting rod 37 drives the externally mounted frame 3 to move downwards, allowing the brush plate 34 to contact the surface of the electronic components. After cleaning, the electric push rod 310 is retracted, returning the lifting plate 36 to its initial position, separating the brush plate 34 from the surface of the electronic components. The distance between the frames 3 can be adjusted. During adjustment, the positioning bolts 312 on the corresponding frames 3 are loosened, separating the positioning bolts 312 from the connecting rod 37, thereby releasing the fixation of the frames 3. Then, the position of the frames 3 is adjusted as needed, and then the positioning bolts 312 are tightened, so that one end of the positioning bolt 312 abuts against the connecting rod 37. The reaction force generated during the abutment makes the positioning bolt 312 and the threaded hole b311 fit tightly together. The friction between the threads limits the positioning bolt 312. The four positioning bolts 312 fix the frames 3, preventing the frames 3 from moving.

[0049] Example 4

[0050] Based on Embodiment 1, the solution in Embodiment 1 will be further described in detail below with reference to the specific working method, such as... Figures 1 to 10 As shown below, see details:

[0051] Multiple suction tubes 4 are fixedly installed on the inner walls of opposite sides of the processing cabinet 1. A fixed frame 41 is fixedly installed inside the equipment cavity 12. A collection frame 42 is slidably connected inside the fixed frame 41. Dust collection fans 43 are respectively installed on opposite sides of the fixed frame 41. The output ends of the two dust collection fans 43 are connected to the inside of the fixed frame 41. The input ends of the two dust collection fans 43 are connected to the multiple suction tubes 4 on both sides through dust collection pipes. A filter screen 44 is provided on the front side of the collection frame 42. Two air inlets 5 are opened on the top of the processing cabinet 1. Two boxes 51 are fixedly installed on the top of the processing cabinet 1. An air filter screen 52 and a dehumidification plate 53 are provided inside the box 51. Air supply pipes 54 are fixedly connected to opposite sides of the box 51. The two air supply pipes 54 are respectively connected to the two air inlets 5. Air inlet pipes 55 are connected to opposite sides of the box 51. A heating module 56 is fixedly installed at one end of the air inlet pipe 55.

[0052] Specifically, when cleaning dust from the surface of electronic components, two vacuum fans 43 are activated simultaneously. The activation of the vacuum fans 43 generates suction from the suction pipes 4 on both sides, drawing air out of the processing cabinet 1. The cleaned dust is sucked away with the air, preventing secondary contamination of the electronic components. This also removes humid air from inside the processing cabinet 1, keeping it dry. The extracted air and dust are transported to the fixed frame 41, while the air flows out through the filter 44 on the collection frame 42. Dust remains in the collection frame 42 to prevent indiscriminate discharge. A sealing strip is installed between the fixed frame 41 and the collection frame 42 to prevent air from escaping through the gaps between them. When air is drawn in, fresh air from outside enters the cabinet 51 through the air inlet duct 55 under the action of suction. The fresh air passes through the air filter 52 to remove impurities, and then passes through the dehumidification plate 53 to absorb moisture from the air. The dehumidification plate 53 consists of a frame in one direction and two metal meshes. Desiccant is filled between the two metal meshes. When air passes through the gaps between the desiccant, it can absorb moisture from the air, allowing dry and clean air to enter the processing cabinet 1. A suction fan can be installed at one end of the air supply duct 54 to assist in air intake as needed. The heating module 56 can be turned on as needed to heat the incoming fresh air. The warm air flowing from the processing cabinet 1 can remove moisture from the electronic components.

[0053] All electrical components mentioned in the text are electrically connected to the main controller and power supply. The main controller can be a conventional and known device such as a computer, and the existing publicly available power connection technology will not be elaborated in the text.

[0054] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A moisture-proof and dust-removing device for electronic components, characterized in that, include: The processing cabinet (1) has a processing chamber (11) and an equipment chamber (12) inside. Two pairs of mounting rods (13) are fixedly connected inside the processing chamber (11), and multiple placement plates (14) are fixedly installed between the two pairs of mounting rods (13). The clamping mechanism is provided on the placement plate (14) and is used to clamp and fix electronic components. The clamping mechanism includes: a fixed clamping plate (2), a movable clamping plate (21), a roller a (22), a transmission belt a (23), a connecting block (24), a moving groove (25), and a rubber plate (26). The cleaning mechanism is located inside the processing chamber (11) and is used to clean dust on electronic components. The cleaning mechanism includes: a frame (3), a roller b (31), a transmission belt b (32), a moving plate (33), a brush plate (34), and a drive motor (35).

2. The electronic component moisture-proof and dust-removing device according to claim 1, characterized in that, The top of the placement plate (14) is fixedly connected to a plurality of fixed clamps (2). Each fixed clamp (2) has a movable clamp (21) on one side. Two rollers a (22) are rotatably connected between the inner walls of opposite sides at the bottom of the placement plate (14). A transmission belt a (23) is connected between the two rollers a (22). The top of the two transmission belts a (23) is fixedly connected to a number of connecting blocks (24) matching the movable clamps (21). Two moving grooves (25) are opened on the placement plate (14). The two transmission belts a (23) are located directly below the two moving grooves (25). The top of the connecting block (24) extends into the moving groove (25) and is connected to the opposite movable clamp (21). Rubber plates (26) are fixedly installed on opposite sides of the fixed clamps (2) and the movable clamps (21).

3. The electronic component moisture-proof and dust-removing device according to claim 1, characterized in that, A frame (3) is provided above each of the placement plates (14). Two rollers b (31) are rotatably connected between the inner walls of opposite sides of the frame (3). Two transmission belts b (32) are connected between the two rollers b (31). Multiple moving plates (33) are fixedly connected between the two transmission belts b (32). A brush plate (34) is fixedly installed on each of the moving plates (33). A drive motor (35) is fixedly installed on the front side of the frame (3). The drive shaft of the drive motor (35) is connected to one of the rollers b (31).

4. The electronic component moisture-proof and dust-removing device according to claim 1, characterized in that, A knob (27) is fixedly connected to the outside of the rotating shaft of one of the rollers a (22). A threaded hole a (28) is opened at the bottom of the placement plate (14) near the knob (27). A fixing bolt (29) is threaded inside the threaded hole a (28). The top of the fixing bolt (29) abuts against the rotating shaft of the knob (27).

5. The electronic component moisture-proof and dust-removing device according to claim 1, characterized in that, The processing chamber (11) is equipped with a lifting plate (36) near the top. The bottom of the lifting plate (36) is fixedly connected to four connecting rods (37) arranged in a rectangular array. The frame (3) is provided with connecting holes (38) at the four corners. The bottom ends of the four connecting rods (37) pass through the four connecting holes (38). The bottom ends of the connecting rods (37) are threaded with limit nuts (39). The top of the processing cabinet (1) is fixedly installed with an electric push rod (310). The output end of the electric push rod (310) extends into the processing cabinet (1) and connects to the top of the lifting plate (36).

6. The electronic component moisture-proof and dust-removing device according to claim 5, characterized in that, The frame (3) has threaded holes b (311) on opposite sides that communicate with the connecting hole (38). A positioning bolt (312) is threaded inside the threaded hole b (311). One end of the positioning bolt (312) extends into the threaded hole b (311) and abuts against the outside of the connecting rod (37).

7. The electronic component moisture-proof and dust-removing device according to claim 1, characterized in that, Multiple suction tubes (4) are fixedly installed on the inner walls of opposite sides of the processing cabinet (1). A fixed frame (41) is fixedly installed inside the equipment cavity (12). A collection frame (42) is slidably connected inside the fixed frame (41). Dust collectors (43) are respectively provided on opposite sides of the fixed frame (41). The output ends of the two dust collectors (43) are connected to the inside of the fixed frame (41). The input ends of the two dust collectors (43) are connected to the multiple suction tubes (4) on both sides through dust collection pipes. A filter screen (44) is provided on the front side of the collection frame (42).

8. The electronic component moisture-proof and dust-removing device according to claim 1, characterized in that, The processing cabinet (1) has two air inlets (5) on its top. Two boxes (51) are fixedly installed on the top of the processing cabinet (1). The boxes (51) are equipped with air filters (52) and dehumidification plates (53). Air supply pipes (54) are fixedly connected to opposite sides of the boxes (51). The two air supply pipes (54) are connected to the two air inlets (5) respectively. Air inlet pipes (55) are connected to opposite sides of the boxes (51). A heating module (56) is fixedly installed at one end of the air inlet pipe (55).

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