Rolling area tail end sealing device

Abstract

The utility model provides a rolling area tail end sealing device which is characterized in that a rolling machine is arranged in a rolling area, the rolling machine is covered with a rolling machine cover, the rolling machine is fixed to the two sides of the rolling machine cover so as to drive the rolling machine cover to move, and the tail end of the rolling machine cover is provided with a rear end fixing cover in a wrapping mode; and a gap between the roller press cover and the rear end fixing cover is sealed by a sealing device. Efficient sealing in the rolling process can be achieved, damage of smoke to equipment is reduced, and the service life of the equipment is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of solid waste treatment, and particularly relates to a tail end sealing device of a roller pressing area. BACKGROUND

[0002] At present, the main methods for treating steel slag include hot splashing, hot smelting, water quenching, air quenching, roller method and granulation method. The hot smelting method is the most effective method for comprehensive utilization, high value-added utilization and energy saving and environmental protection of steel slag, because it can fully digest the free calcium oxide and free magnesium oxide in the steel slag, and eliminate the instability factors of the steel slag. The hot smelting method has been more and more widely used. One of the processes of the hot smelting method is to crush the steel slag before the hot smelting treatment, so that the steel slag can be fully digested in the hot smelting. The crushing process of the steel slag is applied to a slag tank tilting machine and a roller press. The molten steel slag is poured into the roller pressing area through the slag tank tilting machine, and the steel slag is crushed by the roller press through roller pressing treatment. The cooling water cools the molten steel slag.

[0003] However, in the traditional treatment process, a large amount of dust and high humidity are generated, which can cause a large amount of dust on the slag tank tilting machine and the roller press, especially on the driving system, and can easily damage the equipment. CONTENT OF THE INVENTION

[0004] To at least partially solve the above problems, the present application provides a tail end sealing device of a roller pressing area, which can realize efficient sealing and reduce the damage of smoke dust to the equipment, and prolong the service life of the equipment.

[0005] The tail end sealing device of the roller pressing area of the present application is provided with a roller press, and the roller press is provided with a roller press cover. The roller press and the roller press cover are fixed on both sides to drive the movement of the roller press cover. The tail end of the roller press cover is provided with a rear end fixed cover. The gap between the roller press cover and the rear end fixed cover is sealed by a sealing device.

[0006] In an optional embodiment, the outer shape of the roller press cover is inverted, and the two side walls are located on the top end plane of the two vertical side plates of the roller bed of the roller pressing area. The rear end fixed cover includes a cover body, the outer shape of the cover body is inverted, and the two side walls are located on the top end plane of the two vertical side plates of the roller bed. In the cross-sectional direction, the cover body is located inside the roller press cover.

[0007] In an optional embodiment, the connection position of the cover body and the roller press cover is provided with a translation cover. The cover body is inverted, and the two side walls are located on the top end plane of the two vertical side plates of the roller bed. In the cross-sectional direction, the translation cover is located outside the cover body and inside the roller press cover. The top of the cover body is provided with a track, and the bottom of the top panel of the translation cover is provided with a wheel pair to drive it to walk along the track.

[0008] In an optional embodiment, the gaps between the cover, the translation cover, and the roller press cover are sealed with a high-temperature resistant soft sealing material.

[0009] In one optional embodiment, wheel stops are provided at both the front and rear of the track to physically limit the translation cover.

[0010] In one optional embodiment, a clamping bracket three and a clamping bracket two are provided between the translation cover and the roller press cover, and the translation cover is given a moving force by the interaction of the clamping bracket three and the clamping bracket two.

[0011] In one optional embodiment, both the third and second card holders are of the shape and are arranged to bite and clamp each other. The first horizontal arm of the third card holder is fixed to the bottom of the top panel of the translation cover, and the second vertical arm is arranged away from the translation cover. The first horizontal arm of the second card holder is fixed to the top of the top panel of the roller press cover, and the second vertical arm is arranged close to the translation cover and is in contact with the second vertical arm of the third card holder.

[0012] In one optional embodiment, a notch is provided in the middle of both side walls of the cover, and the notch is sealed with a high-temperature resistant soft sealing material; the notch is used to prevent interference between the roller press and the cover.

[0013] In one optional embodiment, a roller press crossbeam is provided at the front and rear of the roller press, and the two side walls of the roller press cover are fixed to the roller press crossbeam; the notch is provided corresponding to the position of the roller press crossbeam to prevent interference between the roller press crossbeam and the cover.

[0014] In one optional embodiment, the upper rear wall of the cover is sequentially connected to a tapered pipe section with a gradually decreasing diameter, an air duct, and then connected to an external dust removal device.

[0015] This application provides a sealing device for the tail end of a roller pressing zone. The roller pressing zone includes a roller press, and the roller press is covered by a roller press cover. The roller press and the roller press cover are fixed on both sides to drive the roller press cover to move. A rear-end fixing cover is installed at the tail end of the roller press cover, and the gap between the roller press cover and the rear-end fixing cover is sealed by a sealing device. The drive unit of the roller press is isolated from the combined sealed solid material roller pressing system and moves synchronously with the roller press and the roller press cover, preventing dust accumulation on the drive unit of the roller press, thus protecting the equipment and extending its service life. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, 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 embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a schematic general drawing of this application.

[0018] Figure 2 This is an enlarged schematic diagram of position 1 of the translation cover.

[0019] Figure 3 This is a side view of position 1 of the translation cover.

[0020] Explanation of markings in the diagram:

[0021] A-Rear end fixed cover, A1-Air duct, A2-Reducing diameter section, A3-Cover body, A4-Notch, A5-Railway, A6-Wheel stop, A8-Railway;

[0022] B-Roller press, B1-Cooling device, B2-Slot 2, B3-Movable cover, B4-Hinge, B5-Roller body, B6-Roller press cover, B7-Roller press crossbeam, B8-Physical limit door catch, B9-Door body lifting component, B10-Card seat 2;

[0023] C-Slag pot tilter, C1-Baffle, C2-Tilter beam, C3-Push door device;

[0024] D-Slag Pot;

[0025] E-roller bed;

[0026] F - Discharge port;

[0027] G-Conveying System;

[0028] H-Transfer cover, H1-Transfer cover body, H2-Wheel pair, H3-Card holder three, H4-Blocking. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] In the traditional roller pressing process, the large amount of dust and high humidity generated will result in a large amount of dust on the slag pot tilter and roller press, especially on the drive system, which can easily damage the equipment.

[0031] Example 1

[0032] Therefore, Embodiment 1 of this application provides a sealing device for the tail end of the rolling zone, see [link to embodiment]. Figure 1The roller pressing area is equipped with a roller press B, and the roller press B is covered by a roller press cover B6. The roller press B and the roller press cover B6 are fixed on both sides to drive the roller press cover B6 to move. The rear end of the roller press cover B6 is covered by a rear end fixing cover A. The gap between the roller press cover B6 and the rear end fixing cover A is sealed by a sealing device.

[0033] In an alternative implementation, see Figure 3 The outer shape of the roller press cover B6 is an inverted U-shape, and its two side walls are located on the top plane of the two vertical side plates of the roller bed E in the roller pressing area; the rear fixed cover A includes a cover body A3, which is also an inverted U-shape, with its two side walls located on the top plane of the two vertical side plates of the roller bed E; in the cross-sectional direction, the cover body A3 is located inside the roller press cover B6.

[0034] In an optional embodiment, a notch A4 is provided in the middle of both side walls of the cover A3, and the notch A4 is sealed with a high-temperature resistant soft sealing material; the notch A4 is used to prevent the roller press B from interfering with the cover A3.

[0035] In one optional embodiment, a roller press crossbeam B7 is provided at the front and rear of the roller press B, and the two side walls of the roller press cover B6 are fixed to the roller press crossbeam B7; the notch A4 is provided corresponding to the position of the roller press crossbeam B7 to prevent the roller press crossbeam B7 of the roller press B from interfering with the cover A3.

[0036] In one optional embodiment, the upper rear wall of the cover A3 is sequentially connected to a tapered pipe section A2 with a gradually decreasing diameter, an air duct A1, and then connected to an external dust removal device.

[0037] In one embodiment of this application, a cooling device B1 is provided on the roller press B. The cooling device B1 includes a water pipe and a nozzle. The water pipe is installed on the roller press beam B7 of the roller press B, with the outlet end connected to the nozzle and the inlet end connected to an external water pipe.

[0038] Furthermore, the number of water pipes and nozzles can be set to 2 to 4 rows, with 1 to 3 nozzles in each row.

[0039] In one embodiment of this application, a cyclone dust removal structure is provided at the position of the rear fixed cover A near the variable diameter section A2, so that the particles in the dust-laden flue gas return to the roller bed E at the bottom of the roller press B through cyclone dust removal and gravity settling.

[0040] In one embodiment of this application, the roller bed E at the bottom of the roller press B is provided with a discharge port F, and a storage device G is provided below the discharge port F for material storage and transportation.

[0041] In one embodiment of this application, the drive device of the roller press B is isolated outside the combined sealing device and moves synchronously with the roller press B and the roller press cover B6.

[0042] In one embodiment of this application, see Figure 2 The outer shape of the roller press cover B6 is inverted U-shaped, and its two side walls are located on the top plane of the two vertical side plates of the roller bed E in the roller pressing area; the rear fixed cover A includes a cover body A3, which is also inverted U-shaped, with its two side walls located on the top plane of the two vertical side plates of the roller bed E in the roller pressing area; in the cross-sectional direction, the cover body A3 is located inside the roller press cover B6; a notch A4 is provided in the middle of the two side walls of the cover body A3, and the notch A4 is sealed with a high-temperature resistant soft sealing material; the notch A4 is used to prevent interference between the roller press B and the cover body A3.

[0043] In one embodiment of this application, the roller press cover B6 is mounted on the roller press beam B7 of the roller press B and moves synchronously with the movement of the roller press B. The side walls of the roller press cover B6 and the rear end fixing cover A are located on the top plane of the two vertical side plates of the roller bed E in the roller pressing zone, with a small gap between them. This small gap is sealed using a high-temperature soft seal. Exemplarily, the seal is fixed to the bottom of the side walls of the roller press cover B6 and the side walls of the rear end fixing cover A, respectively, and moves and seals the top plane of the two vertical side plates of the roller bed E.

[0044] In one embodiment of this application, the sealing device includes a high-temperature resistant soft sealing material for sealing, specifically, the gap between the cover A3 and the roller press cover B6 is sealed with the high-temperature resistant soft sealing material. The fixed cover A3 and the roller press cover B6 are fitted together in order of size from the inside out, and the gap between the covers is sealed by the high-temperature resistant soft sealing material to achieve a sealing effect. Exemplarily, the seal is fixed to the inner wall of the roller press cover B6, and moves along the outer wall of the fixed cover A3 as the roller press cover B6 moves, sealing the gap.

[0045] Because the drive unit of the roller press B in this application is isolated from the combined enclosed solid material roller pressing system and moves synchronously with the roller press B and the roller press cover B6, dust accumulation on the drive unit of the roller press B is avoided, which helps protect the equipment and extend its service life.

[0046] Example 2

[0047] In this embodiment 2, in order to extend the length of the sealed area of ​​the roller pressing zone, to facilitate the containment and processing of more solid materials, and to allow the roller press B to have more space for roller pressing, a translation cover H can be further provided at the tail of the roller press cover B6.

[0048] In one embodiment of this application, a translational cover H is provided at the connection position between the cover A3 and the roller press cover B6. The cover A3 is in the shape of an inverted U, and its two side walls are located on the top plane of the two vertical side plates of the roller bed E. In the cross-sectional direction, the translational cover H is located outside the cover A3 and inside the roller press cover B6. A track A8 is provided on the top of the cover A3, and a wheel pair H2 is provided at the bottom of the top panel of the translational cover H to drive it to move along the track A8.

[0049] In one embodiment of this application, the two side walls of the cover A3 are located on the top plane of the two vertical side plates of the roller bed E.

[0050] In one embodiment of this application, the gaps between the cover A3, the translation cover H, and the roller press cover B6 are sealed with a high-temperature resistant soft sealing material.

[0051] In one embodiment of this application, wheel stops A6 are provided at both the front and rear of the track A8 to physically limit the translation cover H.

[0052] In one embodiment of this application, a clamping bracket 3 H3 and a clamping bracket 2 B10 are provided between the translation cover H and the roller press cover B6, and the translation cover H is given a moving force by the interaction of the clamping bracket 3 H3 and the clamping bracket 2 B10.

[0053] In one embodiment of this application, both the card holder 3 H3 and the card holder 2 B10 are L-shaped and are clamped together. The first horizontal arm of the card holder 3 H3 is fixed to the bottom of the top panel of the translation cover H, and the second vertical arm is disposed on the side away from the translation cover H. The first horizontal arm of the card holder 2 B10 is fixed to the top of the top panel of the roller press cover B6, and the second vertical arm is disposed on the side close to the translation cover H and is in contact with the second vertical arm of the card holder 3 H3.

[0054] The translation cover H is placed on track A8 via wheelset H2. Driving force is applied to the roller press cover B6 by the roller press beam B7 of the roller press B. The interaction of mounting brackets H3 and B10 applies a pushing and pulling force to the translation cover H, thus enabling its unpowered translation. The fixed cover A3, translation cover H1, and roller press cover B6 are fitted together from the inside out, and the gaps between the covers are sealed with high-temperature resistant soft sealing material to achieve a tight seal.

[0055] Specifically, see Figure 1The right side of the translation cover H is connected to the second bracket B10 and the roller press cover B6 via a bracket three H3. The gap between the left side of the translation cover H and the cover body A3 is sealed with a high-temperature resistant soft sealing material. For example, the seal can be fixed on the left side of the translation cover H, and the seal extends towards the cover body A3. When the translation cover H moves, the seal H4 moves on the cover body A3, sealing the gap. The combination of the third bracket H3 and the second bracket B10 serves as a seal, and a seal can be further fixed on the right side of the translation cover H, and this seal extends upwards towards the roller press cover B6, closing the gap between the translation cover H and the roller press cover B6.

[0056] Example 3

[0057] In the above embodiments 1 and 2, the inlet end structure of the roller press cover B6 can be of various types. It can be a closed type, that is, the tilting machine beam C2 is sealed inside the roller press cover B6, or the movable cover door of this embodiment can be used.

[0058] Based on Embodiment 1, in this Embodiment 3, the movable cover door B3 is further configured to be located at the entrance of the roller press cover B6 and rotatably connected to the upper sill above it; the push door device C3 is configured on the tilting machine beam C2 at the front of the slag pot tilting machine C.

[0059] In one embodiment of this application, the inlet end of the roller press cover B6 is provided with an upper sill, which is fixedly connected to the top and both sides of the inlet end of the roller press cover B6, and the movable cover door B3 is rotatably connected to the bottom of the upper sill via a hinge B4.

[0060] In one embodiment of this application, a physical limiting door suction B8 is provided between the movable cover B3 and the inlet end of the roller press cover B6. The physical limiting door suction B8 is used to fix the inner wall of the movable cover B3 in the vertical direction when the movable cover B3 falls and closes.

[0061] In one embodiment of this application, the movable cover B3 is provided with a first pole of a physical limiting door suction B8 on both sides, and the roller press cover B6 is provided with a second pole of a physical limiting door suction B8 on the inner side of the inlet end. When the first pole and the second pole attract each other, the movable cover B3 is in a vertical state and closes the inlet end of the roller press cover B6.

[0062] In one embodiment of this application, a slag pot D is provided on the slag pot tilting machine C, and the slag pot tilting machine C is used to pour molten steel slag or other types of solid waste slag to be rolled into the rolling zone.

[0063] In one embodiment of this application, two openings B2 are provided at the inlet ends of the two side walls of the roller press cover B6 so that the tilting machine beam C2 on the slag pot tilting machine C does not interfere with the roller press cover B6 when the machine is moving.

[0064] In one embodiment of this application, a high-temperature resistant soft sealing material is installed to seal the notch B2.

[0065] As the slag pot tilter C moves along the track into the roller bed, the push-door device C3 on the tilter beam C2 pushes the movable door B3 from the vertical direction to the top. When the slag pot tilter C is pouring the molten steel slag in the slag pot D, the movable door B3 is in the upper position. After the slag pot tilter C exits the roller pressing area, the movable door B3 returns to the vertical state, as part of the combined closed solid material roller pressing system.

[0066] In this application, the system is applicable regardless of whether the discharge port F and the conveying system G are located at the front or rear of the roller pressing area.

[0067] The rolling process using the combined enclosed solid material rolling system provided in one embodiment of this application is as follows: The slag pot tilter C carries the slag pot D into the rolling zone, and the side baffles C1 and the cover A3 simultaneously form a seal. The slag pot tilter C and the slag pot D themselves also form a lateral seal on the rolling mill cover B6. When the push door device C3 is a plate, it further plays a lateral sealing role. As the slag pot tilter C moves along the track direction into the roller bed E, the push door device C3 on the tilter beam C2 pushes the movable cover B3 from the vertical direction around the hinge B4 to the top. The slag pot tilter C pours the molten steel slag in the slag pot D onto the roller bed E. At this time, the movable cover B3 is in the upper position.

[0068] After the slag tilter C exits the roller pressing area, the movable door B3 slowly descends along the push door device C3 via the door lifting component B9, and is physically positioned and attracted by the physical limiting door suction B8, returning to a vertical state. The physical limiting door suction B8 on the outer frame of the movable door B3 prevents the movable door B3 from opening outwards. When the tilter C enters the roller pressing area, the movable door B3 automatically opens and rises, without affecting the slag dumping operation of the tilter C; and when the tilter C finishes dumping the slag and leaves the roller pressing area, the door automatically falls, forming a sealed space, and then roller pressing is performed, sealing the dust generated during the roller pressing process within the sealed space to prevent smoke and dust from overflowing.

[0069] After the movable hood B3 descends to close the roller press hood B6, the roller press B reciprocates within the roller bed E to crush the molten steel slag. After crushing, the slag is pushed to the roller bed discharge port F. Below the discharge port F, there is a storage device G for material storage and transportation. During the roller crushing process, the cooling device B1 sprays water to cool the molten steel slag. The generated flue gas is captured by a combined closed system consisting of the roller press hood B6, the movable hood B3, and the roller bed E, and is then drawn into the subsequent dust removal system through the rear fixed hood A, the translational hood H, and the air duct A1.

[0070] In the above process, the slag pot tilting machine C can enter and exit the roller press hood B6 according to a set time interval and duration. Under set conditions (e.g., roller press B is stopped, the flue gas concentration is below a first threshold, and the temperature is below a second threshold), it enters the roller press hood B6, automatically unloads (the unloading is completed after a set time), and exits the roller press hood B6. This process can be set by a PLC controller to achieve automated roller pressing. The flue gas concentration and temperature can be measured by sensors, and the duration and frequency can be set by timers. This application focuses on providing the structural composition of a sealing device at the tail end of the roller pressing zone; therefore, the control process is not described in detail.

[0071] Furthermore, the roller press B has a roller body B5 for roller crushing and a pusher plate (not shown in the figure) for pushing the steel slag, and commercially available equipment can be used.

[0072] Furthermore, the cooling device can reduce the water volume during water spraying to maximize the utilization of the residual heat from the molten steel slag.

[0073] The translation cover H is a supplement to the sealed length of the roll pressing zone. If there is enough space, the translation cover H can be omitted.

[0074] For high-temperature soft sealing of various gaps in this application, please refer to [reference needed]. Figure 2 Schematic diagram of the sealing structure numbered H4.

[0075] Furthermore, since the slag pot tilter only unloads material into the roller press hood B6 during the roller pressing gap, ash accumulation in the slag pot tilter is avoided. At the same time, both ends are effectively closed during the roller pressing process to prevent smoke and dust from overflowing. Since it is not necessary to completely cover the slag pot tilter C and the conveying track, the volume of the sealed hood is reduced, thus the dust removal air volume is reduced accordingly. The requirements for subsequent dust removal facilities and water treatment facilities are also reduced, which greatly saves project costs and operating expenses.

[0076] The movable cover door B3 is automatically raised or lowered by the door pushing device C3. Opening and closing does not require on-site operators to operate the jog button. Moreover, due to the door lifting component B9, it is not only easy to push the door automatically, but also avoids the door pushing device from directly contacting the movable cover door B3 body. This prevents the door body from being damaged by the slag pot tilter C or burned by the high-temperature molten steel slag on the slag pot tilter C, which brings a lot of convenience to on-site operation and maintenance.

[0077] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A device for closing the end of a rolling zone, said rolling zone being provided with a rolling machine (B), characterised in that, The roller press (B) is provided with a roller press cover (B6), and the roller press (B) and the roller press cover (B6) are fixed on both sides to drive the roller press cover (B6) to move, the tail end of the roller press cover (B6) is provided with a rear end fixed cover (A), and the gap between the roller press cover (B6) and the rear end fixed cover (A) is sealed by a sealing device.

2. A roll nip tail end closure device according to claim 1, wherein, The roller press cover (B6) is in the shape of an inverted U, and the two side walls are located on the top end planes of the two vertical side plates of the roller bed (E); the rear end fixed cover (A) comprises a cover body (A3), the cover body (A3) is in the shape of an inverted U, and the two side walls are located on the top end planes of the two vertical side plates of the roller bed (E); in the transverse cross-sectional direction, the cover body (A3) is located inside the roller press cover (B6).

3. A roll nip tail end closure device according to claim 2, wherein, The connecting position of the cover body (A3) and the roller press cover (B6) is provided with a translation cover (H), the cover body (A3) is in the shape of an inverted U, and the two side walls are located on the top end planes of the two vertical side plates of the roller bed (E); in the transverse cross-sectional direction, the translation cover (H) is located outside the cover body (A3) and inside the roller press cover (B6); the top of the cover body (A3) is provided with a track (A8), and the bottom of the top panel of the translation cover (H) is provided with a wheel pair (H2) to drive it to walk along the track (A8).

4. A roll nip tail end closure device according to claim 3, wherein, The gap between the cover body (A3), the translation cover (H) and the roller press cover (B6) is sealed by a high-temperature-resistant soft sealing material.

5. A roll nip tail end closure device according to claim 3, wherein, The track (A8) is provided with a car stop (A6) in front and back, which is used for physically limiting the translation cover (H).

6. A roll nip tail end closure device according to claim 3, wherein, The translation cover (H) and the roller press cover (B6) are provided with a clamping seat three (H3) and a clamping seat two (B10) which clamp each other, and the translation cover (H) is driven to walk by the interaction of the clamping seat three (H3) and the clamping seat two (B10).

7. A roll nip tail end closure device according to claim 6, wherein, The clamping seat three (H3) and the clamping seat two (B10) are both L-shaped and are arranged in opposite clamping mode, the horizontal first arm of the clamping seat three (H3) is fixed to the bottom of the top panel of the translation cover (H), and the vertical second arm is arranged away from one side of the translation cover (H); the horizontal first arm of the clamping seat two (B10) is fixed to the top of the top panel of the roller press cover (B6), the vertical second arm is arranged close to one side of the translation cover (H), and is in contact with the vertical second arm of the clamping seat three (H3).

8. A roll nip tail end closure device according to claim 2, wherein, The middle part of the two side walls of the cover body (A3) is provided with an opening (A4), and the opening (A4) is installed with a high-temperature-resistant soft sealing material to seal; the opening (A4) is used to prevent the interference between the roller press (B) and the cover body (A3).

9. A roll nip tail end closure device according to claim 8, wherein, The roller press (B) is provided with a roller press beam (B7) in front and back, and the two side walls of the roller press cover (B6) are fixed with the roller press beam (B7); the opening (A4) is arranged corresponding to the position of the roller press beam (B7) to prevent the interference between the roller press beam (B7) of the roller press (B) and the cover body (A3).

10. A roll nip tail end closure device according to claim 2, wherein, The upper part of the rear wall of the cover body (A3) is sequentially connected with a diameter-tapered section (A2) pipeline and an air pipe (A1) which is connected with an external dust removal device.

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