CN114465141A

CN114465141A - Dustproof heat dissipation type looped netowrk cabinet

Info

Publication number: CN114465141A
Application number: CN202210182310.4A
Authority: CN
Inventors: 丁白夜
Original assignee: Nanjing Xinjing Power Equipment Installation Co ltd
Current assignee: Nanjing Xinjing Power Equipment Installation Co ltd
Priority date: 2022-02-26
Filing date: 2022-02-26
Publication date: 2022-05-10

Abstract

The invention discloses a dustproof heat dissipation type ring main unit, and relates to the technical field of ring main units. Dustproof heat dissipation type looped netowrk cabinet includes the cabinet body, the dust screen, vibrator, dust collection box and fender dirt protective screen, be equipped with the louvre on the lateral wall of the cabinet body, dust screen and vibrator all install on the inner wall of the cabinet body, the louvre is coved to the dust screen, vibrator and dust screen butt, keep off the dirt protective screen and all install on the inner wall of the cabinet body with the dust collection box, the dust collection box is located between fender dirt protective screen and the dust screen, the fender dirt protective screen includes flexible inflation package, gas transmission spare and exhaust part, flexible inflation package and gas transmission spare are all installed on the inner wall of the cabinet body, the exhaust part is installed on flexible inflation package, gas transmission spare and exhaust part all communicate with flexible inflation package. This application can reduce the dust on the dust screen and drift on the internal equipment of cabinet to help reducing the influence of dust to the internal equipment of cabinet, simultaneously, can reduce the radiating influence to the cabinet body, make the cabinet body can normally dispel the heat.

Description

Dustproof heat dissipation type looped netowrk cabinet

Technical Field

The invention relates to the technical field of ring main units, in particular to a dustproof heat dissipation type ring main unit.

Background

The ring main unit is a device required by a transmission and distribution network, and is widely applied to distribution stations and box-type substations of load centers such as residential districts, large-scale public buildings, factory enterprises and the like. The looped netowrk cabinet can produce a large amount of heats at the course of the work, consequently, the looped netowrk cabinet that uses at present all is provided with the louvre, moreover, in order to protect the equipment in the looped netowrk cabinet, still can set up the dust screen in louvre department.

In the related art, a dustproof ring main unit is disclosed, which comprises a ring main unit, wherein a group of dustproof nets and a vibration device are arranged inside the ring main unit, and the vibration device is in contact with the dustproof nets; a limiting groove for installing a dust screen is formed in the ring main unit, an electric sliding rail and a lifting plate are further arranged in the ring main unit, and the vibration device is fixedly installed on the lifting plate; the left end and the right end of the ring main unit are respectively provided with a radiating groove for improving the heat dissipation performance, the dust screens are respectively arranged at the left end and the right end of the ring main unit, a gap is reserved between each dust screen and the inner wall of the ring main unit, the bottom of the ring main unit is fixedly provided with a dust collection box, and the left end and the right end of each dust collection box are respectively provided with an opening; and a time relay and a power-on delay relay which are respectively used for controlling the electric slide rail and the vibration device are arranged in the ring main unit.

To the above-mentioned correlation technique, the inventor thinks that when vibrator shakes the dust screen, the dust on the dust screen can fly upward around in the looped netowrk cabinet, can adsorb partly dust on the equipment in the looped netowrk cabinet, and the dust can influence some equipment work that comparatively is accurate.

Disclosure of Invention

In order to reduce the influence of dust to equipment in the looped netowrk cabinet, this application provides a dustproof heat dissipation type looped netowrk cabinet.

In a first aspect, the application provides a dustproof heat dissipation type ring main unit adopts following technical scheme:

the utility model provides a dustproof heat dissipation type looped netowrk cabinet, includes the cabinet body, dust screen, vibrator and dust collection box, still includes the dust blocking protective screen, be equipped with the louvre on the lateral wall of the cabinet body, dust screen and vibrator all install on the inner wall of the cabinet body, the dust screen covers the louvre, vibrator and dust screen butt, the dust blocking protective screen and dust collection box are all installed on the inner wall of the cabinet body, the dust collection box is located between dust blocking protective screen and the dust screen, the dust blocking protective screen includes flexible inflation package, gas transmission spare and air discharge spare, flexible inflation package and gas transmission spare are all installed on the inner wall of the cabinet body, the air discharge spare is installed on flexible inflation package, gas transmission spare and air discharge spare all with flexible inflation package intercommunication.

Through adopting above-mentioned technical scheme, when the piece of airing exhaust was emptied the interior gas of flexible inflation package, flexible inflation package shrink, the internal hot-air of cabinet can pass dust screen and louvre and discharge outside the cabinet body for the cabinet body can normally dispel the heat. When the gas transmission piece is inflated into the flexible expansion bag, the flexible expansion bag expands and separates the dustproof net from the equipment in the cabinet body, when the vibration device vibrates the dustproof net, dust flies between the flexible expansion bag and the dustproof net and finally falls into the dust collecting box, and the flexible expansion bag can reduce the dust on the dustproof net and fly onto the equipment in the cabinet body, so that the influence of the dust on the equipment in the cabinet body is reduced.

In a specific can embodiment, the air discharge member includes jet-propelled pipe, elasticity stopper, blast pipe and exhaust control valve, the jet-propelled pipe has a plurality of, jet-propelled pipe fixed connection is on the flexible inflation package is towards the surface of dust screen, jet-propelled pipe and flexible inflation package intercommunication, in the jet-propelled pipe was located to the elasticity stopper, one side lateral wall and the inner wall fixed connection of jet-propelled pipe of elasticity stopper, the opposite side lateral wall and the inner wall butt of jet-propelled pipe of elasticity stopper, blast pipe fixed connection is on the flexible inflation package, exhaust control valve installs on the blast pipe.

Through adopting above-mentioned technical scheme, when the pressure in the flexible inflation package is great, the elasticity stopper takes place deformation under the pressure of atmospheric pressure, and the gas in the flexible inflation package passes through the jet-propelled pipe and spouts on the dust screen, both can reduce flexible inflation package and damage because of pressure is too big, can blow down the dust on the dust screen again, help clearing up the dust. When the exhaust control valve is opened, the gas in the flexible expansion bag can be exhausted, and when the exhaust control valve is closed, the flexible expansion bag can be expanded.

In a specific implementation scheme, the air delivery piece comprises an air pump, an air delivery pipe and an air delivery control valve, the air pump is installed on the inner wall of the cabinet body, one end of the air delivery pipe is connected with the air delivery end of the air pump, the other end of the air delivery pipe is communicated with the flexible expansion bag, and the air valve is installed on the air delivery pipe.

Through adopting above-mentioned technical scheme, when the air delivery control valve was opened, the air pump was inflated to flexible inflation package through the gas-supply pipe, and when the air delivery control valve was closed, gas can be kept in flexible inflation package for flexible inflation package can keep the state of inflation.

In a specific implementation scheme, the flexible expansion bag comprises a flexible airbag and a rolling strip for rolling the flexible airbag, the flexible airbag is provided with a plurality of flexible airbags which are fixedly connected to the inner wall of the cabinet body and are sequentially connected, the adjacent flexible airbags are communicated, the rolling strip is fixedly connected to the flexible airbags, and the gas transmission piece and the gas exhaust piece are both connected with the flexible airbags.

Through adopting above-mentioned technical scheme, adopt a plurality of flexible gasbags to constitute flexible inflation package for flexible inflation package inflation back is still comparatively flat, and the space between flexible inflation package and the dust screen is great, and the dust of being convenient for falls into in the dust collecting box. The rolling strip is a long strip of a tape measure type, is in a spiral winding state in a normal state, and when the flexible air bag is inflated, the rolling strip is expanded along with the flexible air bag and straightened, so that the whole flexible expansion bag can form a barrier wall. When the gas in the flexible air bag is discharged, the rolling strip is automatically rolled and drives the flexible air bag to roll, so that the flexible air bag is convenient to store, and the influence on the heat dissipation of the cabinet body is reduced.

In a specific possible embodiment, the flexible expansion bag further comprises a dust sticking film, and the dust sticking film is stuck on the surface of the flexible air bag facing the dust-proof net.

Through adopting above-mentioned technical scheme, the dust film can adhere the dust that is close to flexible gasbag, when the rolling of flexible gasbag, can reduce the dust on the flexible gasbag and fly upward problem once more.

In a specific implementation scheme, a plurality of side sealing blocks are arranged on the inner wall of the cabinet body, the flexible expansion bag is located between the two opposite side sealing blocks, clamping grooves are formed in the side walls, facing the flexible expansion bag, of the side sealing blocks, the flexible expansion bag is inserted into the clamping grooves, and the flexible expansion bag is abutted to the groove walls of the clamping grooves.

Through adopting above-mentioned technical scheme, the side seal piece helps supporting the flexible inflation package of tight inflation state, reduces the dust and passes from the gap between flexible inflation package and the cabinet body inner wall.

In a specific possible embodiment, a blocking rod is mounted on the inner wall of the cabinet body and is positioned between the flexible airbag and the equipment in the cabinet body.

Through adopting above-mentioned technical scheme, at the expanded in-process of flexible gasbag, block that the pole can block flexible gasbag and expand to the direction that is close to equipment, reduce flexible gasbag and equipment and bump to help reducing the influence to equipment. And the space occupied by the blocking rod is small, which is beneficial to reducing the influence on the flow of hot air.

In a specific possible implementation scheme, the dust collecting box comprises a drawing box body and a guiding clamping plate, the guiding clamping plate is fixedly connected to the drawing box body, an opening is formed in the upper surface of the drawing box body, a drawing groove is formed in the cabinet body, a guiding groove is formed in the groove wall of the drawing groove, the drawing box body is inserted into the drawing groove, the guiding clamping plate is inserted into the guiding groove, and the drawing box body is located below the dust screen.

Through adopting above-mentioned technical scheme, can follow the pull inslot with the pull box body and pull out, be convenient for pour the dust in the pull box body, the direction cardboard helps reducing the pull box body and rocks.

In summary, the present application includes at least one of the following beneficial technical effects:

the dust on the dust screen can be reduced from falling on the equipment in the cabinet body, so that the influence of the dust on the equipment in the cabinet body is reduced, and meanwhile, the influence on the heat dissipation of the cabinet body can be reduced, so that the cabinet body can normally dissipate heat;

by arranging the air injection pipe, the elastic plug, the exhaust pipe and the exhaust control valve, the damage of the flexible expansion bag due to overlarge pressure can be reduced, and dust on the dustproof net can be blown down, so that the dust is cleaned;

this application is through setting up flexible gasbag and coiling strip for still more being flat after the flexible inflation package inflation, help the dust to fall into in the dust collecting box, make moreover that flexible inflation package can contract automatically after exhausting.

Drawings

Fig. 1 is a schematic structural diagram of a dustproof heat dissipation type ring main unit in the embodiment of the present application.

Fig. 2 is a sectional view of the internal structure of a cabinet for embodying the embodiment of the present application.

Fig. 3 is a schematic view of the construction of a dust barrier in an embodiment of the present application.

Fig. 4 is an enlarged view at a in fig. 3.

Fig. 5 is an enlarged view at B in fig. 3.

FIG. 6 is a schematic view of the exploded structure of the gas lance and the elastomeric plug in the example of the present application.

Fig. 7 is an exploded view of the cabinet and the dust box in the embodiment of the present application.

Description of reference numerals:

1. a cabinet body; 11. heat dissipation holes; 12. a blocking lever; 13. side sealing blocks; 14. drawing the groove; 141. a guide groove; 2. a dust screen; 3. a vibration device; 4. a dust collecting box; 41. drawing the box body; 411. an opening; 42. a guide clamping plate; 5. a dust barrier; 51. a flexible expansion bag; 511. a flexible bladder; 512. rolling up the strip; 513. a dust sticking film; 52. a gas delivery member; 521. an air pump; 522. a gas delivery pipe; 523. a gas delivery control valve; 53. an exhaust member; 531. a gas ejector tube; 532. an elastic plug; 5321. a connecting portion; 5322. a movable portion; 533. an exhaust pipe; 534. an exhaust control valve.

Detailed Description

The present application is described in further detail below with reference to figures 1-7.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

The embodiment of the application discloses dustproof heat dissipation type looped netowrk cabinet.

Referring to fig. 1 and 2, the dustproof heat dissipation type ring main unit includes a cabinet body 1, a dustproof net 2, a vibration device 3, a dust collection box 4 and a dust barrier 5. The cabinet body 1 is a rectangular cabinet, the side wall of the cabinet body 1 is provided with heat dissipation holes 11 and a drawing groove 14, the dust screen 2, the vibration device 3, the dust collection box 4 and the dust blocking barrier 5 are all positioned in the cabinet body 1, and the dust screen 2 is riveted on the inner wall of the cabinet body 1 and covers the heat dissipation holes 11. Vibrator 3 installs on the inner wall of cabinet body 1, and vibrator 3 and dust screen 2's frame butt. The dust collecting box 4 is inserted into the drawing groove 14 and is abutted against the groove wall, and the dust collecting box 4 is positioned below the dust screen 2. The dust barrier 5 is arranged on the inner bottom wall of the cabinet body 1, and the dust barrier 5 is positioned between the dust screen 2 and the equipment in the cabinet body 1.

The operation keeps off dirt protective screen 5 and keeps apart dust screen 2 with equipment, then starts vibrator 3, and vibrator 3 shakes dust screen 2, and dust screen 2 takes place vibrations, and the dust on the dust screen 2 breaks away from dust screen 2 and flies upward everywhere, and the dust descends and falls into in the dust collection box 4 along the gap between dust screen 2 and the dirt protective screen 5. Then the vibration device 3 is closed, the dust barrier 5 is operated to shrink, and the hot air in the cabinet body 1 continues to pass through the dust screen 2 and the heat dissipation holes 11 and is dispersed to the outside of the cabinet body 1.

Referring to fig. 3 and 4, the dust barrier 5 includes a flexible expansion bag 51, an air transmission member 52, and an air discharge member 53, the flexible expansion bag 51 is adhered to the inner bottom wall of the cabinet 1, the air transmission member 52 is mounted on the inner bottom wall of the cabinet 1, the air discharge member 53 is mounted on the flexible expansion bag 51, and both the air transmission member 52 and the air discharge member 53 are communicated with the flexible expansion bag 51. The welding has the pole 12 of blockking on the interior diapire of cabinet body 1, blocks pole 12 and extends to the top of cabinet body 1 from cabinet body 1 bottom, blocks pole 12 and is located one side that flexible inflation package 51 deviates from dust screen 2, blocks to have the gap between pole 12 and the flexible inflation package 51.

The air transmission member 52 is started, the air transmission member 52 inflates the flexible expansion bag 51, the flexible expansion bag 51 expands, and the blocking rod 12 blocks the flexible expansion bag 51 from extending towards the direction close to the equipment. The gas transmission piece 52 is closed, the gas exhaust piece 53 is opened, the gas in the flexible expansion bag 51 is exhausted, and the flexible expansion bag 51 is contracted.

Referring to fig. 3 and 4, two sides of the flexible expansion bag 51 are provided with a side sealing block 13, the two side sealing blocks 13 are opposite, and the side sealing blocks 13 are welded on the inner side wall of the cabinet 1. When the flexible expansion bag 51 expands, the flexible expansion bag 51 abuts against the side seal blocks 13 on both sides.

Referring to fig. 4, the flexible inflatable bag 51 includes a plurality of flexible air cells 511, a wrap strip 512 and a dust-sticking film 513, wherein all of the flexible air cells 511 are arranged in sequence, and two adjacent flexible air cells 511 are integrally connected and communicated with each other. The rolling strip 512 is a flexible steel sheet with toughness, the rolling strip 512 is adhered to the surface of the flexible air bag 511 facing away from the dustproof net 2, and the dust sticking film 513 is adhered to the surface of the flexible air bag 511 facing towards the dustproof net 2.

When the gas in the flexible airbag 511 is exhausted, the winding strip 512 is in a spirally wound state. When the flexible air bag 511 is filled with air and inflated, the rolling strip 512 is in a stretched state, and the dust-sticking film 513 is opposite to the dust screen 2. A part of the flying dust adheres to the surface of the dust adhesion film 513, and when the flexible air bag 511 contracts, the dust adhesion film 513 contracts in synchronization with the flexible air bag 511.

Referring to fig. 3 and 5, the air delivery member 52 includes an air pump 521, an air delivery pipe 522, and an air delivery control valve 523. The air pump 521 is riveted on the inner wall of the cabinet body 1, and the air pump 521 is positioned on one side of the flexible air bag 511 departing from the dust screen 2. The air pipe 522 is positioned between the air pump 521 and the flexible air bag 511, one end of the air pipe 522 is connected with the air delivery end of the air pump 521, the other end of the air pipe 522 is connected with the bottom end of the flexible air bag 511, and the air pipe 522 is communicated with the flexible air bag 511. The air delivery control valve 523 is mounted on the air delivery pipe 522.

Referring to fig. 4 and 6, the exhaust member 53 includes an air injection pipe 531, an elastic stopper 532, an exhaust pipe 533 and an exhaust control valve 534, the exhaust pipe 533 is connected to the flexible airbag 511, the exhaust control valve 534 is attached to the exhaust pipe 533, and the air feed control valve 523 and the exhaust control valve 534 are electrically operated valves.

The air injection pipes 531 are provided with a plurality of air injection pipes 531, all the air injection pipes 531 are connected to the surface, facing the dustproof net 2, of the flexible air bag 511, the air injection pipes 531 are evenly distributed on the surface of the flexible air bag 511, and each air injection pipe 531 is communicated with the flexible air bag 511. The elastic plug 532 is disposed in the gas ejector 531, and the elastic plug 532 is divided into a connecting portion 5321 and a movable portion 5322 in this embodiment. The connecting portion 5321 is bonded to the inner wall of the gas lance 531, and the movable portion 5322 abuts the inner wall of the gas lance 531.

Referring to fig. 7, the dust box 4 includes a drawing box body 41 and a guide clamping plate 42, the drawing box body 41 is a rectangular box, and an opening 411 is formed on the upper surface of the drawing box body 41. The guide clamping plates 42 are straight plates, the number of the guide clamping plates 42 is two, one guide clamping plate 42 is bonded on the left side wall of the drawing box body 41, and the other guide clamping plate 42 is bonded on the right side wall of the drawing box body 41. The two opposite side walls of the drawing groove 14 are provided with guide grooves 141, the drawing box body 41 is inserted into the drawing groove 14 and is abutted against the groove walls, and the guide clamping plate 42 is inserted into the guide grooves 141 and is abutted against the groove walls.

The implementation principle of the dustproof heat dissipation type ring main unit in the embodiment of the application is as follows: the drawing box body 41 is inserted into the drawing groove 14, the exhaust control valve 534 is closed, the gas transmission control valve 523 and the gas pump 521 are opened, the gas pump 521 inflates the flexible air bag 511, the flexible air bag 511 expands, and the winding strip 512 is gradually straightened from the winding state.

After the flexible air bag 511 abuts against the side sealing block 13, the vibration device 3 is started, the vibration device 3 vibrates the dustproof net 2, dust flies, a part of dust is adhered to the dust adhering net, and the other part of dust falls into the drawing box body 41. The flexible air bag 511 is continuously inflated, when the air pressure in the flexible air bag 511 is too high, the air pushes the movable part 5322 of the elastic plug 532 to deform, the air in the flexible air bag 511 is sprayed out from the air spraying pipe 531 and onto the dust screen 2, and the air blows off the dust on the dust screen 2.

Then, the air pump 521 and the air delivery control valve 523 are closed, the movable part 5322 automatically returns to the original state, the air injection pipe 531 is closed, the exhaust control valve 534 is opened, the air in the flexible air bag 511 is exhausted from the exhaust pipe 533, the winding strip 512 is automatically wound under the action of the self elasticity, and the flexible air bag 511 and the dust sticking film 513 are synchronously contracted. Then, the drawing box body 41 is drawn out from the drawing groove 14, and the dust is poured out, so that the dust removing work is completed.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a dustproof heat dissipation type looped netowrk cabinet, includes cabinet body (1), dust screen (2), vibrator (3) and dust collection box (4), its characterized in that: also comprises a dust barrier (5), the side wall of the cabinet body (1) is provided with heat dissipation holes (11), the dust screen (2) and the vibration device (3) are both arranged on the inner wall of the cabinet body (1), the dust screen (2) covers the heat dissipation holes (11), the vibration device (3) is abutted against the dust screen (2), the dust blocking barrier (5) and the dust collecting box (4) are both arranged on the inner wall of the cabinet body (1), the dust collecting box (4) is positioned between the dust blocking screen (5) and the dust screen (2), the dust barrier (5) comprises a flexible expansion bag (51), an air transmission piece (52) and an exhaust piece (53), the flexible expansion bag (51) and the air transmission piece (52) are both arranged on the inner wall of the cabinet body (1), the exhaust piece (53) is installed on the flexible expansion bag (51), and the air transmission piece (52) and the exhaust piece (53) are both communicated with the flexible expansion bag (51).

2. The dustproof heat dissipation type ring main unit according to claim 1, wherein: exhaust spare (53) include jet-propelled pipe (531), elasticity stopper (532), blast pipe (533) and exhaust control valve (534), jet-propelled pipe (531) have a plurality of, jet-propelled pipe (531) fixed connection is on flexible inflation package (51) towards the surface of dust screen (2), jet-propelled pipe (531) and flexible inflation package (51) intercommunication, in jet-propelled pipe (531) was located in elasticity stopper (532), elasticity stopper (532) include connecting portion (5321) and movable part (5322), the inner wall fixed connection of connecting portion (5321) and jet-propelled pipe (531), the inner wall butt of movable part (5322) and jet-propelled pipe (531), blast pipe (533) fixed connection is on flexible inflation package (51), exhaust control valve (534) are installed on blast pipe (533).

3. The dustproof heat dissipation type ring main unit according to claim 1, wherein: the air delivery piece (52) comprises an air pump (521), an air delivery pipe (522) and an air delivery control valve (523), wherein the air pump (521) is installed on the inner wall of the cabinet body (1), one end of the air delivery pipe (522) is connected with the air delivery end of the air pump (521), the other end of the air delivery pipe (522) is communicated with the flexible expansion bag (51), and the air valve is installed on the air delivery pipe (522).

4. The dustproof heat dissipation type looped netowrk cabinet of claim 1, its characterized in that: flexible inflation package (51) include flexible gasbag (511) and rolling strip (512) that are used for rolling flexible gasbag (511), flexible gasbag (511) have a plurality of, flexible gasbag (511) fixed connection is on the inner wall of the cabinet body (1), a plurality of flexible gasbag (511) connect gradually, adjacent two flexible gasbag (511) are linked together, rolling strip (512) fixed connection deviates from on the surface of dust screen (2) in flexible gasbag (511), gas transmission spare (52) and air discharge spare (53) all link to each other with flexible gasbag (511).

5. The dustproof heat dissipation type ring main unit according to claim 4, wherein: the flexible expansion bag (51) further comprises a dust sticking film (513), and the dust sticking film (513) is stuck on the surface, facing the dust-proof net (2), of the flexible air bag (511).

6. The dustproof heat dissipation type ring main unit according to claim 4, wherein: the inner wall of the cabinet body (1) is provided with a blocking rod (12), and the blocking rod (12) is positioned between the flexible expansion bag (51) and the equipment in the cabinet body (1).

7. The dustproof heat dissipation type looped netowrk cabinet of claim 1, its characterized in that: be equipped with a plurality of side seal piece (13) on the inner wall of the cabinet body (1), flexible inflation package (51) are located between two relative side seal pieces (13), flexible inflation package (51) and side seal piece (13) butt.

8. The dustproof heat dissipation type looped netowrk cabinet of claim 1, its characterized in that: the dust collection box (4) comprises a drawing box body (41) and a guide clamping plate (42), the guide clamping plate (42) is fixedly connected to the drawing box body (41), an opening (411) is formed in the upper surface of the drawing box body (41), a drawing groove (14) is formed in the cabinet body (1), a guide groove (141) is formed in the groove wall of the drawing groove (14), the drawing box body (41) is inserted into the drawing groove (14), the guide clamping plate (42) is inserted into the guide groove (141), and the drawing box body (41) is located below the dust screen (2).