CN118477405A - A dust treatment device for steel mills - Google Patents

Abstract

The invention relates to the technical field of dust removal, and in particular discloses a dust treatment device for a steel mill, which comprises the following components: the filter comprises a shell, a ventilation assembly, a filter and a cleaning assembly, wherein the shell is further provided with a partition plate, the partition plate is further provided with a ventilation opening, the filter is fixedly connected to the partition plate, the cleaning assembly comprises a driving mechanism, a mounting ring, a movable plate, a first magnet and a scraping plate, the mounting ring is arranged on the periphery side of the filter, the movable plate is rotationally connected with the mounting ring, the first magnet is arranged on the outer side of the movable plate, the scraping plate is arranged on the inner side of the movable plate, the top end of the filter is provided with a limiting rod, the limiting rod is provided with a tooth slot, the movable plate is fixedly connected with a first gear, the first gear can be meshed with the limiting rod, and the movable plate is provided with a filter screen; the dust treatment device for the steel mill can not damage the filter when cleaning the filter, and can not generate secondary dust.

Description

A dust treatment device for steel mills

Technical Field

The invention relates to the technical field of dust removal, and in particular to a dust treatment device for a steel mill.

Background Art

Steel mills generate a large amount of dust during metal processing. This dust is usually composed of metal powder and dust. If it is discharged directly into the atmosphere, it will cause serious pollution to the atmospheric environment. Spilling in the workshop will not only seriously affect the health of the workers, but also cause flash explosions when it reaches a certain concentration. In related technologies, bag dust collectors are usually used in conjunction with exhaust systems for dust removal. For bag dust collectors, after long-term use, the outer wall of the filter cloth is usually adhered to metal particles and dust, affecting the filtration efficiency. Traditional cleaning methods include recoil cleaning and scraping cleaning, but recoil cleaning is prone to secondary dust.

A Chinese patent with authorization publication number CN113332804B discloses a bag dust collector, which includes an induced draft device and a plurality of filter bags connected to the induced draft device, an intermittent air supply device for intermittently conveying dust-containing air into the filter bags is arranged between the induced draft device and the plurality of filter bags; the patent also includes a frame, the filter bags are hoisted on the frame, a bag clamping device is arranged on the frame for lifting, the bag clamping device includes two clamping plates, the two clamping plates are arranged on both sides of the filter bags and are arranged in parallel, a driving mechanism for driving the two clamping plates to move closer to or away from each other is arranged on the clamping plates, and a lifting mechanism for simultaneously driving the two clamping plates to lift and reciprocate is arranged on the frame.

In this patent, when the two clamping plates are close to each other, the multiple rubbing rods on the two clamping plates are staggered in sequence, which improves the squeezing efficiency of the two clamping plates on the dust-containing air in the filter bag, and also makes the dust adhering to the bag wall of the filter bag as much as possible. However, for the dust in the steel mill, the dust is mixed with metal powder, which is easy to damage the bag when scraping off the metal powder.

Summary of the invention

The present invention provides a dust treatment device for a steel mill, aiming to solve the problem in the related art that scraping off metal powder during cleaning of the filter cloth causes damage to the filter cloth, while preventing secondary dust.

The dust treatment device for steel mills of the present invention comprises: a housing, a ventilation component, a filter, and a cleaning component;

The ventilation assembly is used to perform air blowing or air extraction operations;

The filter is fixedly connected to the housing;

The cleaning assembly includes a driving mechanism, a mounting ring, a movable plate, and a first magnet. The mounting ring is arranged on the outer peripheral side of the filter. The driving mechanism is used to drive the mounting ring to move and rotate along the axial direction of the filter. The movable plate is rotatably connected to the mounting ring. The first magnet is arranged on the outer side of the movable plate. A limiting rod extending downward is provided at the top of the filter, and a tooth groove is provided on the limiting rod. A first gear is fixedly connected to the movable plate, and the first gear can engage with the limiting rod. A filter is provided on the movable plate.

Beneficial effect: The driving mechanism drives the mounting ring to move upward and rotate, so that the first magnet can attract the metal particles attached to the outside of the filter to the inner wall of the movable plate, and the metal particles are removed. Then, the ventilation assembly blows air into the filter, and the airflow flows from the inside of the filter to the outside of the filter, and takes away the dust attached to the outside of the filter. When the first gear moves along the limit rod, it drives the movable plate to rotate, and the airflow mixed with dust will pass through the filter plate and be discharged. The filter plate can filter out the dust in the airflow to prevent secondary dust. This cleaning method can avoid damage to the filter due to scraping.

Preferably, an air inlet is provided at the bottom end of the shell, and an air outlet is provided at the top end thereof. A partition is also provided on the shell, and the partition divides the shell into an upper cavity and a lower cavity. A vent is also provided on the partition.

Preferably, the ventilation assembly includes a sliding plate, an exhaust fan and a recoil device, the exhaust fan is arranged in the upper cavity, the sliding plate and the partition are slidably matched, a second driving member is provided between the sliding plate and the partition, the recoil device is arranged on the sliding plate, and a first channel and a second channel are respectively provided on both sides of the recoil device.

Preferably, the driving mechanism includes a first driving member, a lead screw, a rotating ring and a driving gear, the first driving member is arranged beside the filter and fixedly connected to the filter, the lead screw is vertically distributed beside the filter, the first driving member is connected to the lead screw, the inner wall of the rotating ring is rotatably matched with the mounting ring, and its outer wall is threaded with the lead screw, the driving gear is rotatably matched with the rotating ring, and the driving gear is threaded with the lead screw, the mounting ring is provided with a tooth groove, and the driving gear is meshed with the mounting ring.

Preferably, a connecting rod is provided between the movable plate and the mounting ring, a sliding groove is provided on the side wall of the movable plate, one end of the connecting rod is rotatably connected to the mounting ring, and the other end thereof is rotatably connected to a slider, the slider is slidably fitted in the sliding groove, a push plate is provided on the slider, the push plate can stop against the first magnet, and the first magnet is slidably fitted on the movable plate.

The effect is that when the movable plate rotates, it will drive the connecting rod to rotate, the connecting rod drives the push plate to move along the movable plate, the push plate pushes the first magnet to move along the movable plate, the push plate can push the first magnet to the filter plate, at this time, the metal particles on the inner side of the movable plate move to the inner side of the filter plate with the first magnet, the metal particles are distributed on the filter plate, making it difficult for dust in the air to pass through the filter, thereby improving the filtering effect of the filter on the airflow.

Preferably, there is a gap between the push plate and the inner side wall of the movable plate.

The effect is that there is a gap between the push plate and the inner wall of the movable plate. When the metal particles are distributed on the filter net, the push plate continues to move and pass through the filter plate. At this time, the push plate can evenly spread the metal particles on the filter plate, so that the metal particles are evenly distributed on the filter plate.

Preferably, a scraper is slidably fitted on the inner wall of the movable plate, and the push plate is connected to the scraper via a first elastic member.

The effect is that the push plate drives the scraper to move through the first elastic member while pushing the first magnet to move, and the scraper can scrape the inner wall of the movable plate to prevent metal particles from remaining on the movable plate.

Preferably, a limit plate is provided on the scraper, a limit protrusion is provided above the side wall of the movable plate, the limit protrusion can stop against the limit plate, a baffle is provided on the inner wall of the movable plate, and the baffle is located above the filter screen.

Preferably, a first magnetic ring and a second magnetic ring are respectively provided at the bottom of the filter, the diameter of the first magnetic ring is larger than the diameter of the mounting ring, the diameter of the second magnetic ring is smaller than the diameter of the mounting ring, a second elastic member is provided between the first magnet and the movable plate, one end of the second elastic member is fixedly connected to the first magnet, and the other end thereof is stopped against the movable plate, and the first magnet can be close to or away from the movable plate.

The effect is: the first magnet is attracted by the first magnetic ring, so that the first magnet is moved away from the movable plate. At this time, the suction force of the first magnet on the metal particles is reduced and is smaller than the suction force of the second magnetic ring on the metal particles. The metal particles will be attracted by the second magnetic ring and adhere to the second magnetic ring, thereby achieving the removal of the metal particles.

Preferably, the bottom of the shell is funnel-shaped, and an ash discharge port is provided at the bottom end of the shell.

Beneficial effects:

1. According to the dust treatment device for steel mills of the present invention, the driving mechanism drives the mounting ring to move upward and rotate, so that the first magnet can attract the metal particles attached to the outside of the filter to the inner wall of the movable plate to complete the removal of the metal particles, and then the ventilation component blows air into the filter to remove the dust attached to the outside of the filter. This cleaning method can avoid damage to the filter due to scraping.

2. A filter is provided on the movable plate. When the first gear passes the limit rod, it will drive the movable plate to open. At this time, the filter is located directly below the vent. When the recoil device blows air into the filter, the airflow blows into the filter and passes through the filter into the lower cavity. When passing through the filter, the airflow will take away the dust attached to the outside of the filter. The airflow passes through the filter and flows out through the vent. The dust carried in the airflow will be filtered out by the filter to prevent secondary dust from being caused after the airflow is discharged from the outer casing.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a cross-sectional view of a dust treatment device for a steel mill according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing the coordination of the filter and ventilation components according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of the structure of a ventilation assembly according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of the structure of a cleaning component according to an embodiment of the present invention.

FIG. 5 is a schematic diagram of a partial structure of a cleaning component according to an embodiment of the present invention.

FIG. 6 is a schematic diagram of the structure of the movable plate according to an embodiment of the present invention.

FIG. 7 is a schematic diagram of the bottom structure of the filter according to an embodiment of the present invention.

FIG8 is a schematic diagram of the flow of recoil dust removal gas in an embodiment of the present invention.

Reference numerals:

1000, housing; 1001, air inlet; 1002, air outlet; 1003, partition; 1004, upper cavity; 1005, lower cavity;

2000, ventilation assembly; 2001, sliding plate; 2002, recoil device; 2003, first channel; 2004, second channel; 2005, second driving member;

3000, filter;

4000, cleaning assembly; 101, first driving member; 102, lead screw; 103, rotating ring; 104, driving gear; 2, mounting ring; 3, movable plate; 4, first magnet; 5, scraper; 6, filter; 7, first gear; 8, limit rod; 9, connecting rod; 10, push plate; 11, first elastic member; 12, limit plate; 13, limit protrusion; 14, baffle; 15, first magnetic ring; 16, second magnetic ring.

DETAILED DESCRIPTION

Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

As shown in FIGS. 1 to 8 , the dust treatment device for a steel mill of the present invention includes: a housing 1000 , a filter 3000 and a cleaning component 4000 .

Specifically, as shown in FIGS. 1 to 3 , the housing 1000 is disposed on the ground, and has an air inlet 1001 at the bottom and an air outlet 1002 at the top. A vent is also disposed at the top of the housing 1000, and the vent is located next to the air outlet 1002. There are multiple filters 3000, which are distributed at intervals on the housing 1000, and the filters 3000 are bag filters. The housing 1000 is provided with a ventilation assembly 2000, and the ventilation assembly 2000 includes a sliding plate 2001, an exhaust fan and a recoil device 2002. The housing 1000 is provided with a partition 1003, and the partition 1003 divides the housing 1000 into an upper cavity 1004 and a lower cavity 1005, and the upper cavity 1004 is connected to the air outlet 1002, and the lower cavity 1005 is connected to the air inlet 1001. The sliding plate 2001 is slidably matched on the partition 1003. The exhaust fan is arranged on the top of the housing 1000, which is used to extract the air in the upper cavity 1004. A second driving member 2005 is arranged between the sliding plate 2001 and the partition 1003. The second driving member 2005 is a hydraulic cylinder, which is used to drive the sliding plate 2001 to move. The recoil device 2002 is arranged on the partition 1003, and the first channel 2003 and the second channel 2004 are respectively arranged on both sides of the recoil device 2002. The bottom of the housing 1000 is funnel-shaped, and an ash discharge port is arranged at the bottom end.

As shown in Figures 2 and 4, the cleaning assembly 4000 includes a driving mechanism, a mounting ring 2, a movable plate 3, a first magnet 4 and a scraper 5. The driving mechanism includes a first driving member 101, a lead screw 102, a rotating ring 103 and a driving gear 104. The first driving member 101 is a motor, which is fixedly connected to the filter 3000. The lead screw 102 is rotatably matched to the filter 3000, and its top end is fixedly connected to the output end of the first driving member 101. The first driving member 101 is used to drive the lead screw 102 to rotate. The rotating ring 103 is located on the outer peripheral side of the filter 3000 and is spaced apart from the filter 3000. The outer wall of the rotating ring 103 is threadedly matched on the lead screw 102, and the top of the driving gear 104 is rotatably matched with the rotating ring 103, and the driving gear 104 is threadedly matched with the lead screw 102. The mounting ring 2 is rotatably matched on the inner wall of the rotating ring 103, and the bottom of the mounting ring 2 is provided with a tooth groove, and the driving gear 104 can be meshed with the mounting ring 2 through the tooth groove. The first driving member 101 drives the lead screw 102 to rotate, driving the rotating ring 103 to move up and down, thereby controlling the installation ring 2 to move up and down. The driving gear 104 moves up and down synchronously with the rotating ring 103. The driving gear 104 rotates during the up and down movement and drives the installation ring 2 to rotate around its center.

As shown in Fig. 2, Fig. 4 to Fig. 6, the top of the movable plate 3 is rotatably connected to the mounting ring 2 through a rotating shaft, the first magnet 4 is slidably fitted on the outer wall of the movable plate 3, and a second elastic member is provided between the first magnet 4 and the movable plate 3, one end of the second elastic member is fixedly connected to the first magnet 4, and the other end thereof is abutted against the movable plate 3, the second elastic member is a spring, which applies a thrust to the first magnet 4 so that the first magnet 4 is abutted against the movable plate 3, and the scraper 5 is slidably fitted on the inner wall of the movable plate 3. A first gear 7 is also provided at the top of the movable plate 3, and a limit rod 8 extending downward is provided at the top of the filter 3000, and a tooth groove is provided on the limit rod 8, and the first gear 7 can mesh with the limit rod 8. A connecting rod 9 is also provided between the mounting ring 2 and the movable plate 3, one end of the connecting rod 9 is rotatably fitted with the mounting ring 2, and the other end thereof is rotatably connected with a slider, and a sliding groove is provided on the side wall of the movable plate 3, and the slider is slidably fitted in the sliding groove. A push plate 10 is fixedly connected to the slider, and the push plate 10 can abut against the bottom end of the first magnet 4. There is a gap between the push plate 10 and the inner side wall of the movable plate 3, and the push plate 10 and the scraper 5 are elastically connected through a first elastic member 11, and the first elastic member 11 is a spring. A limiting protrusion 13 is provided on the side wall of the movable plate 3, and a limiting plate 12 is provided on the scraper 5. The limiting protrusion 13 can abut against the limiting plate 12, thereby limiting the maximum distance that the scraper 5 moves upward. A filter screen 6 is provided in the middle area of the movable plate 3, and a baffle 14 is also provided above the filter screen 6. The baffle 14 is fixedly connected to the inner side wall of the movable plate 3 and is located above the filter screen 6. The baffle 14 is used to limit the distribution range of metal particles.

As shown in FIG. 7 , a first magnetic ring 15 and a second magnetic ring 16 are further provided at the bottom of the filter 3000 . The diameter of the first magnetic ring 15 is larger than the diameter of the mounting ring 2 , and the diameter of the second magnetic ring 16 is smaller than the diameter of the mounting ring 2 .

According to the dust treatment device for steel mills according to the embodiment of the present invention, when performing dust removal operation, the first channel 2003 is located directly above the filter 3000 and is connected to the inside of the filter 3000. At this time, the second channel 2004 is shielded by the partition 1003.

When cleaning, the air inlet 1001 is closed, the cleaning assembly 4000 is initially located at the bottom of the filter 3000, and the exhaust fan is aligned with the top of the filter 3000. When cleaning, the first driving member 101 drives the lead screw 102 to rotate, thereby driving the rotating ring 103 to move upward, and the mounting ring 2 moves upward synchronously with the rotating ring 103. While moving upward, the gear 104 drives the mounting ring 2 to rotate, so that the first magnet 4 attracts the metal particles on the outer surface of the filter 3000 to the movable plate during the process of spirally moving upward. 3, when the mounting ring 2 is about to move to the top of the filter 3000, the limiting rod 8 contacts and meshes with the first gear 7, and at this time the cleaning assembly 4000 continues to move upward, the limiting rod 8 drives the first gear 7 to rotate and causes the movable plate 3 to rotate around the rotating shaft, thereby opening the movable plate 3, and the opening of the movable plate 3 can drive the connecting rod 9 to rotate, and at this time the slider moves upward along the sliding groove, and the push plate 10 moves synchronously with the slider, and the push plate 10 pushes the first magnet 4 to move upward until the first magnet 4 moves to the filter screen 6, and the push plate 10 can also pull the scraper 5 to move while moving. The first magnet 4 moves upward, and the metal particles on the inner wall of the movable plate 3 are attracted to the filter screen 6 by moving upward. The push plate 10 moves upward to evenly spread the metal particles on the filter screen 6 so that they are evenly distributed on the filter screen 6. The scraper 5 can prevent the metal particles from remaining on the movable plate 3. As shown in FIG8 , at this time, the filter screen 6 is aligned with the vent on the housing 1000, and the sliding plate 2001 is driven to move by the second driving member 2005. The recoil device 2002 moves to the top of the filter 3000, and the second channel 2004 moves to the vent. The lower cavity 1005 is ventilated. The second channel 2004 is connected with the upper cavity 1004, and the recoil device 2002 blows air into the filter 3000. The dust attached to the outside of the filter 3000 is separated from the filter 3000 under the recoil effect, and flows in the lower cavity 1005 driven by the airflow. When the airflow passes through the filter 6, the dust carried by the airflow will be filtered out by the filter 6 and the metal particles because the filter 6 is distributed with metal particles. The filtered air flows from the gap between the filter 6 and the first magnet 4 to the vent, enters the upper cavity 1004, and is discharged from the air outlet 1002. After the ventilation is completed, the dust falls on the bottom of the housing 1000, and the dust can be discharged by opening the dust discharge port.

Then, the mounting ring 2 is controlled to move downward by the lead screw 102, and the movable plate 3 contracts and resets. When the mounting ring 2 enters the gap between the first magnetic ring 15 and the second magnetic ring 16, the first magnetic ring 15 generates suction on the first magnet 4, so that the first magnet 4 overcomes the elastic force of the second elastic member and moves away from the movable plate 3. In this process, the suction of the first magnet 4 on the metal particles is reduced, and the second magnetic ring 16 can attract the metal particles, so that the metal particles are separated from the movable plate 3 and adsorbed on the second magnetic ring 16.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims (10)

1. A dust disposal apparatus for a steel mill, comprising:

a housing (1000);

a ventilation assembly (2000), wherein the ventilation assembly (2000) is used for blowing or exhausting;

A filter (3000), the filter (3000) being fixedly connected to the housing (1000);

The novel filter is characterized in that a cleaning assembly (4000) is further arranged, the cleaning assembly (4000) comprises a driving mechanism, a mounting ring (2), a movable plate (3) and a first magnet (4), the mounting ring (2) is arranged on the outer periphery side of the filter (3000), the driving mechanism is used for driving the mounting ring (2) to move axially and rotate along the filter (3000), the movable plate (3) is rotationally connected with the mounting ring (2), the first magnet (4) is arranged on the outer side of the movable plate (3), a limiting rod (8) extending downwards is arranged on the top end of the filter (3000), a tooth slot is formed in the limiting rod (8), a first gear (7) is fixedly connected onto the movable plate (3), the first gear (7) can be meshed with the limiting rod (8), and a filter screen (6) is arranged on the movable plate (3).

2. The dust treatment device for steelworks according to claim 1, wherein the bottom end of the housing (1000) is provided with an air inlet (1001), the top end of the housing is provided with an air outlet (1002), the housing (1000) is further provided with a partition plate (1003), the partition plate (1003) divides the housing (1000) into an upper cavity (1004) and a lower cavity (1005), and the partition plate (1003) is further provided with a ventilation opening.

3. The dust treatment device for steelworks according to claim 2, wherein the ventilation assembly (2000) comprises a sliding plate (2001), an exhaust fan and a backflushing device (2002), the exhaust fan is arranged in the upper cavity (1004), the sliding plate (2001) is in sliding fit with the partition plate (1003), a second driving piece (2005) is arranged between the sliding plate (2001) and the partition plate (1003), the backflushing device (2002) is arranged on the sliding plate (2001), and a first channel (2003) and a second channel (2004) are respectively arranged on two sides of the backflushing device (2002).

4. The dust treatment device for a steel mill according to claim 1, wherein the driving mechanism comprises a first driving member (101), a screw rod (102), a rotating ring (103) and a driving gear (104), the first driving member (101) is arranged beside the filter (3000) and fixedly connected with the filter (3000), the screw rod (102) is vertically distributed beside the filter (3000), the first driving member (101) is connected with the screw rod (102), the inner wall of the rotating ring (103) is in running fit with the mounting ring (2), the outer wall of the rotating ring is in threaded fit with the screw rod (102), the driving gear (104) is in running fit with the rotating ring (103), the driving gear (104) is in threaded fit with the screw rod (102), tooth grooves are formed in the mounting ring (2), and the driving gear (104) is meshed with the mounting ring (2).

5. The dust treatment device for steelworks according to claim 1, wherein a connecting rod (9) is arranged between the movable plate (3) and the mounting ring (2), a sliding groove is arranged on the side wall of the movable plate (3), one end of the connecting rod (9) is rotationally connected with the mounting ring (2), the other end of the connecting rod is rotationally connected with a sliding block, the sliding block is in sliding fit in the sliding groove, a push plate (10) is arranged on the sliding block, the push plate (10) can be stopped against the first magnet (4), and the first magnet (4) is in sliding fit on the movable plate (3).

6. The dust handling apparatus for steelworks as set forth in claim 5, wherein a gap is provided between the push plate (10) and the inner side wall of the movable plate (3).

7. The dust treatment device for steelworks according to claim 6, wherein a scraper (5) is further slidably fitted on the inner wall of the movable plate (3), and the push plate (10) is connected with the scraper (5) through a first elastic member (11).

8. The dust treatment device for steelworks according to claim 7, wherein the scraper blade (5) is provided with a limiting plate (12), a limiting protrusion (13) is arranged above the side wall of the movable plate (3), the limiting protrusion (13) can be stopped against the limiting plate (12), a baffle (14) is arranged on the inner wall of the movable plate (3), and the baffle (14) is positioned above the filter screen (6).

9. The dust treatment device for a steel mill according to claim 1, wherein a first magnetic ring (15) and a second magnetic ring (16) are respectively arranged at the bottom of the filter (3000), the diameter of the first magnetic ring (15) is larger than that of the mounting ring (2), the diameter of the second magnetic ring (16) is smaller than that of the mounting ring (2), a second elastic piece is arranged between the first magnet (4) and the movable plate (3), one end of the second elastic piece is fixedly connected with the first magnet (4), the other end of the second elastic piece is abutted against the movable plate (3), and the first magnet (4) can be close to or far away from the movable plate (3).

10. The dust treatment device for steelworks according to claim 1, wherein the bottom of the housing (1000) is funnel-shaped, and the bottom end of the housing (1000) is provided with a dust outlet.