A screening apparatus for metal alloy powder preparation

Abstract

The application relates to a screening device for metal alloy powder preparation and relates to the technical field of solid powder grading devices, which comprises a storage device, a feeding device, a screening device and a collecting device, the feeding device comprises a feeding driving assembly, a feeding pipeline and a scattering assembly, one end of the feeding pipeline is communicated with the storage device, the other end is communicated with the screening device, the feeding driving assembly is installed on the feeding pipeline, the feeding driving assembly is used for driving the movement of material powder in the feeding pipeline, the scattering assembly comprises a rotating piece, scattering blades and an intercepting plate, the scattering blades are rotationally connected to one end of the feeding pipeline close to the screening assembly, the intercepting plate is arranged on the side of the scattering blades, and a gap is reserved between the edge of the scattering blades and the intercepting plate; the application has the beneficial effects that the material powder is prevented from being gathered into the grading cavity, and the final grading quality of the material powder is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of solid powder grading equipment, in particular to a screening equipment for metal alloy powder preparation. BACKGROUND

[0002] The airflow classifier is an airflow grading equipment, the classifier, the cyclone separator, the dust collector and the induced draft fan form a grading system. Material is fed into the inlet at the lower end of the classifier under the action of the fan suction and moves at high speed along the upward airflow to the grading area. Under the action of the strong centrifugal force generated by the high-speed rotating grading turbine, coarse and fine materials are separated. Fine particles meeting the particle size requirement pass through the gap between the grading wheel blades into the cyclone separator or dust collector for collection. Coarse particles lose speed after colliding with the wall and descend along the cylinder wall to the secondary air inlet. Under the strong washing action of the secondary air, coarse and fine particles are separated. Fine particles rise to the grading area for secondary grading, and coarse particles descend to the discharge port for discharge.

[0003] The related prior art discloses a flow classifier which comprises a grading impeller driven by a power device, a cyclone barrel through which grading airflow passes is arranged on the outer periphery of the grading impeller, a feeding port corresponding to the position of the grading impeller is arranged at the top of the cyclone barrel, an air inlet is arranged on the cyclone barrel, a grading cavity for grading material is formed between the cyclone barrel and the grading impeller, an inner cylinder body is arranged below the grading impeller, a sealing device is arranged between the inner cylinder body and the grading impeller, a fine powder discharge port is arranged at the bottom of the inner cylinder body, an outer cylinder body surrounding the inner cylinder body is sealingly connected below the cyclone barrel, and a coarse powder discharge port is arranged at the bottom of the outer cylinder body. When in use, material falls into the grading cavity through the feeding port by gravity, and only one cyclone barrel and grading wheel are used to realize the separation of coarse powder and fine powder, so that the structure is simple, the performance is stable, and the energy consumption is low.

[0004] For the related technology in the above, when solid powder grading is realized by this method, material accumulates at the feeding port and waits to enter the grading cavity. During the accumulation process, material powder is prone to clumping and entering the grading cavity, so that the mixed coarse and fine material powder is difficult to screen, and the final grading quality is affected. SUMMARY

[0005] In order to reduce the clumping of material powder into the grading cavity and improve the final grading quality of the material powder, the application provides a screening equipment for metal alloy powder preparation.

[0006] The screening equipment for metal alloy powder preparation provided by the application adopts the following technical scheme:

[0007] The application discloses a screening device for metal alloy powder preparation, which comprises a storage device, a feeding device, a screening device and a collecting device.

[0008] When the feeding driving assembly transports the material powder to the scattering assembly through the feeding pipeline, the rotating piece drives the scattering blade to rotate, the agglomerated material powder is scattered, the scattered material powder falls into the screening device under the action of gravity after impacting the intercepting plate, the phenomenon of the material powder being agglomerated during transportation is reduced, the coarse material and the fine material are dispersed, the material powder is more easily subjected to classification processing after entering the screening device, and the final classification quality of the material powder is improved.

[0009] Optionally, the intercepting plate is further provided with a material loading disc, a discharging port is arranged on the side of the material loading disc facing the screening device, a vibrating piece is arranged on the material loading disc, the vibrating piece is used for driving the material loading disc to vibrate, and the material loading disc vibrates synchronously with the intercepting plate.

[0010] Through the above technical scheme, the material loading disc can preliminarily receive the material powder, the material powder is less likely to directly bounce into the screening device after impacting the intercepting plate and is difficult to be subjected to classification processing, the final classification quality of the material powder is further improved, the vibrating piece can vibrate the intercepting plate, the possibility of the material powder being adhered to the side wall of the intercepting plate is reduced, the yield of the material powder is improved, the vibrating piece can also vibrate the material loading disc, the material powder falling on the material loading disc is further scattered, and the phenomenon of the material powder being agglomerated and entering the screening device is further reduced.

[0011] Optionally, the storage device comprises a storage tank and an argon conveying device, the argon conveying device is communicated with the storage tank, the argon conveying device is used for conveying argon into the storage tank, a supporting frame is arranged in the storage tank, a detection module is mounted on the supporting frame, the detection module is used for detecting the state of the material powder in the storage tank, the detection module is electrically connected with a controller, the controller is electrically connected with an indicating lamp, the controller is used for receiving the temperature and humidity information of the material powder detected by the detection module and controlling the indicating lamp to be brightened after receiving the information, so as to display the corresponding information.

[0012] By adopting the above technical scheme, the storage tank can realize storage of the material powder, the argon conveying device can realize conveying of argon into the storage tank, the oxygen content in the storage tank is reduced, the phenomenon of oxidation of the material powder in the storage tank is reduced, the final quality of the material powder classification is improved, the detection module can realize real-time detection of the temperature and humidity of the material powder in the storage tank, and the detected data can be transmitted to the controller, the controller can control the indicator light to display the corresponding color after receiving the temperature and humidity data, so that the operator can intuitively observe the state of the material powder in the storage tank, and the final classification quality of the material powder can be ensured.

[0013] Optionally, the feeding driving assembly comprises a feeding auger, a driven gear set, a driving gear set and a transmission chain, the driving gear set is connected to the rotating member, the rotating member is used to drive the driving gear set to rotate, the feeding auger is rotatably connected to the feeding pipeline, the feeding auger is used to drive the material powder in the storage tank to move into the feeding pipeline, the driven gear set is connected to the feeding auger, the driven gear set is used to drive the feeding auger to rotate, and the driving gear set drives the driven gear set to rotate through the transmission chain.

[0014] By adopting the above technical scheme, the rotating member can drive the dispersing blade to rotate and drive the driving gear set to rotate, the driving gear set drives the driven gear set to rotate through the transmission chain, and the driven gear set drives the feeding auger to rotate at the same time, so that one set of rotating members is used to drive multiple mechanisms, and cost is saved.

[0015] Optionally, the driving gear set comprises multiple driving gears with different sizes, and the driving gears are coaxially arranged.

[0016] By adopting the above technical scheme, the transmission chain is sleeved on the driving gears with different sizes to change the rotating speed of the driven gear, the operation is convenient and fast, and multiple different working requirements can be adapted.

[0017] Optionally, the screening device comprises a classification tank, a power member and an airflow classification wheel, the classification tank is used to enclose a classification cavity for classification of the material powder, the power member is installed on the classification tank, the airflow classification wheel is installed on an output end of the power member, the power member is used to drive the airflow classification wheel to rotate, and the airflow classification wheel realizes classification of coarse and fine material powders through centrifugal force.

[0018] By adopting the above technical scheme, the power member drives the airflow classification wheel to rotate, and coarse and fine materials in the classification cavity of the airflow classification wheel rotate at the same time. Since the coarse material has a larger mass, the coarse material is gradually separated from the fine material under the action of centrifugal force, so that the screening processing of the coarse and fine materials is realized.

[0019] Optionally, the airflow classification wheel is provided with main blades, which are uniformly arranged in a circle, and the main blades are slidably connected with auxiliary blades, the auxiliary blades are rotatably connected with synchronous connecting rods, the synchronous connecting rods are rotatably connected with fixing bolts at the ends away from the auxiliary blades, the synchronous connecting rods on adjacent auxiliary blades are rotatably connected with each other through the fixing bolts, the airflow classification wheel is further provided with adjusting holes, the fixing bolts are slidably connected in the adjusting holes, the sliding direction of the fixing bolts is consistent with the sliding direction of the auxiliary blades, and the fixing bolts are threadedly connected with fixing nuts.

[0020] By adopting the above technical scheme, the auxiliary blades are slidably connected with the main blades, so as to change the outer diameter of the airflow classification wheel, and under the same angular velocity, the greater the outer diameter of the airflow classification wheel, the greater the linear velocity at the edge, the linear velocity at the edge of the airflow classification wheel is changed by changing the size of the outer diameter of the airflow classification wheel, so as to adapt to the screening processing of coarse and fine materials of different sizes, without disassembling and replacing the airflow classification wheel, the operation is convenient and fast, the synchronous connecting rods can realize the connection between adjacent auxiliary blades, the position adjustment of all auxiliary blades can be realized by adjusting the position of one auxiliary blade, the operation is convenient and fast, the fixing bolts and the fixing nuts can realize the position fixation of the synchronous connecting rods, the phenomenon of slippage of the auxiliary blades in the working process is reduced, the screening processing stability of the material powder is improved, and the final quality of the material powder screening processing is improved.

[0021] Optionally, the material collecting device comprises a fine material collecting cylinder and a coarse material collecting cylinder, the side walls of the fine material collecting cylinder and the coarse material collecting cylinder are provided with visual windows, and the inner walls of the visual windows are connected with transparent observation pieces.

[0022] By adopting the above technical scheme, the fine material collecting cylinder can realize the collection and storage of fine materials, the coarse material collecting cylinder can realize the collection and storage of coarse particles, the visual windows and the transparent observation pieces can realize the observation of the internal conditions of the fine material collecting cylinder and the coarse material collecting cylinder, and the material powder can be processed in time after being collected.

[0023] Optionally, the cylinder opening parts of the fine material collecting cylinder and the coarse material collecting cylinder are provided with quick release assemblies, the quick release assemblies comprise connecting claws and connecting rings, the connecting rings are connected to the gas classification cylinder, the connecting claws are rotatably connected to the fine material collecting cylinder or the coarse material collecting cylinder, and the connecting claws and the connecting rings are mutually clamped.

[0024] By adopting the above technical scheme, the connecting claws and the connecting rings are mutually clamped to realize the connection between the fine material collecting cylinder and the coarse material collecting cylinder and the gas classification cylinder, and the connecting claws are separated from the connecting rings to realize the disassembly of the coarse material collecting cylinder and the fine material collecting cylinder, so that the operation is convenient and fast.

[0025] Optionally, the fine material collecting cylinder and the coarse material collecting cylinder are provided with flexible sealing strips on the side facing the gas classifying cylinder.

[0026] By adopting the above technical scheme, the flexible sealing strips can improve the sealing performance of the connection between the fine material collecting cylinder and the coarse material collecting cylinder and the gas classifying cylinder, and reduce the leakage of the material powder from the gap.

[0027] To sum up, the present application has at least one of the following beneficial technical effects:

[0028] 1. The device comprises a storage device, a feeding device, a screening device and a collecting device, the feeding device comprises a feeding driving assembly, a feeding pipeline and a scattering assembly, one end of the feeding pipeline is connected to the storage device, the other end is connected to the screening device, the feeding driving assembly is installed on the feeding pipeline, the feeding driving assembly is used to drive the movement of the material powder in the feeding pipeline, the scattering assembly comprises a rotating part, a scattering blade and an intercepting plate, the scattering blade is rotationally connected to one end of the feeding pipeline close to the screening assembly, the rotating part is used to drive the rotation of the scattering blade, the intercepting plate is arranged on the side of the scattering blade, and a gap is reserved between the edge of the scattering blade and the intercepting plate.

[0029] 2. The load tray can preliminarily receive the material powder, reduce the phenomenon that the material powder directly bounces into the screening device after colliding with the intercepting plate, and improve the final classification quality of the material powder. The vibrating part can vibrate the intercepting plate, reduce the possibility that the material powder is adhered to the side wall of the intercepting plate, improve the yield of the material powder, and further vibrate the load tray to further scatter the material powder falling on the load tray, thereby further reducing the phenomenon that the material powder is bunched into the screening device.

[0030] 3. The storage tank can store the material powder, the argon conveying device can convey argon into the storage tank, reduce the oxygen content in the storage tank, reduce the phenomenon of oxidation of the material powder in the storage tank, improve the final classification quality of the material powder, the detection module can detect the temperature and humidity of the material powder in the storage tank in real time, and transmit the detected data to the controller, the controller controls the indicator light to display the corresponding color after receiving the temperature and humidity data, so that the operator can intuitively observe the state of the material powder in the storage tank, and the final classification quality of the material powder is guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a schematic diagram of the overall structure of the screening device for preparing metal alloy powder according to the embodiment of the present application.

[0032] Figure 2 is a cross-sectional structure schematic diagram of the screening equipment for preparing metal alloy powder according to the embodiment of the application.

[0033] Figure 3 is Figure 2 is an enlarged schematic diagram at R in

[0034] Figure 4 is a structural schematic diagram showing the airflow classification wheel.

[0035] The figure mark explanation: 1, feeding driving assembly; 101, feeding auger; 102, driven gear set; 103, driving gear set; 104, transmission chain; 2, feeding pipeline; 3, scattering assembly; 301, rotating part; 302, scattering blade; 303, intercepting plate; 4, material carrying disc; 5, vibrating part; 6, storage tank; 7, argon conveying device; 8, support frame; 9, detection module; 10, controller; 11, indicator light; 12, classification tank; 13, power part; 14, airflow classification wheel; 15, main blade; 16, auxiliary blade; 17, synchronous connecting rod; 18, fixing bolt; 19, adjusting hole; 20, fixing nut; 21, fine material collecting cylinder; 22, coarse material collecting cylinder; 23, visual window; 24, transparent observation part; 25, quick release assembly; 2501, connecting claw; 2502, connecting ring; 26, flexible sealing strip. DETAILED DESCRIPTION

[0036] The following will be combined with the Figure 1 - make further detailed description of the application.

[0037] The embodiment of the application discloses a screening equipment for preparing metal alloy powder. Referring to Figure 1 and Figure 2 , the screening equipment for preparing metal alloy powder comprises a storage device, a feeding device, a screening device and a material collecting device. The storage device comprises a storage tank 6 and an argon conveying device 7, the argon conveying device 7 is communicated with the inside of the storage tank 6, and is used for conveying argon to the inner wall of the storage tank 6; a support frame 8 is welded in the storage tank 6, and a detection module 9 is installed on the support frame 8; the detection module 9 in the embodiment can be a temperature and humidity detection sensor, the detection module 9 is used for detecting the temperature and humidity state of the material powder in the storage tank 6, the detection module 9 is electrically connected with a controller 10, the controller 10 in the embodiment can be a PLC controller 10, the controller 10 is electrically connected with an indicator light 11, the detection module 9 sends the detected temperature and humidity information to the controller 10, and the controller 10 controls the indicator light 11 to light up the color corresponding to the information after receiving the information.

[0038] Referring to Figure 1 and Figure 2The feeding device comprises a feeding driving assembly 1, a feeding pipeline 2 and a scattering assembly 3, the feeding driving assembly 1 comprises a feeding auger 101, a driven gear set 102, a driving gear set 103 and a transmission chain 104, the scattering assembly 3 comprises a rotating part 301, scattering blades 302 and an intercepting plate 303, the feeding auger 101 is rotationally connected to the feeding pipeline 2, one end of the feeding pipeline 2 is communicated with a storage tank 6, and the other end is communicated with a screening device, the driving gear set 103 comprises a plurality of driving gears with different sizes, the driving gears are coaxially arranged and installed at the output end of the rotating part 301, the rotating part 301 transmits the rotation to the driven gear set 102 through the transmission chain 104, the driven gear set 102 drives the feeding auger 101 to rotate, and the rotation of the feeding auger 101 completes the conveying of the material powder; the scattering blades 302 are rotationally connected to one end of the feeding pipeline 2 close to the screening assembly, the rotating part 301 is used for driving the scattering blades 302 to rotate, the rotating part 301 of the embodiment can be a rotating motor, the intercepting plate 303 is installed at the side of the scattering blades 302, a gap is reserved between the edge of the scattering blades 302 and the intercepting plate 303, a loading plate is welded on the intercepting plate 303, a discharge port is formed in the side of the loading plate facing the screening device, the loading plate is provided with a vibrating part 5, the vibrating part 5 of the embodiment can be a vibrating motor, and the loading plate and the intercepting plate 303 vibrate synchronously.

[0039] With reference to Figure 2 and Figure 4 The screening device comprises a grading tank 12, a power part 13 and an airflow grading wheel 14, the grading tank 12 is used for enclosing a grading cavity for grading the material powder, the power part 13 is installed on the grading tank 12, the power part 13 of the embodiment can be a motor, the airflow grading wheel 14 is installed at the output end of the power part 13, the power part 13 is used for driving the airflow grading wheel 14 to rotate, a plurality of main blades 15 are uniformly arranged on the circumference of the airflow grading wheel 14, a secondary blade 16 is slidably connected to the main blade 15, a synchronous connecting rod 17 is rotationally connected to the end of the secondary blade 16, a fixing bolt 18 is connected to the end of the synchronous connecting rod 17 away from the secondary blade 16, the synchronous connecting rods 17 on the adjacent secondary blades 16 are rotationally connected to each other through the fixing bolt 18, an adjusting hole 19 is formed in the airflow grading wheel 14, the fixing bolt 18 is slidably connected in the adjusting hole 19, the sliding direction of the fixing bolt 18 is consistent with the sliding direction of the secondary blade 16, and a fixing nut 20 is threadedly connected to the end of the fixing bolt 18.

[0040] With reference to Figure 2 and Figure 3The aggregate device comprises a fine aggregate collecting cylinder 21 and a coarse aggregate collecting cylinder 22, quick-release assemblies 25 are arranged at cylinder openings of the fine aggregate collecting cylinder 21 and the coarse aggregate collecting cylinder 22, the quick-release assemblies 25 comprise connecting claws 2501 and connecting rings 2502, the connecting rings 2502 are welded to the peripheral wall of the gas grading cylinder, the connecting claws 2501 are rotationally connected to the fine aggregate collecting cylinder 21 or the coarse aggregate collecting cylinder 22, and the connecting claws 2501 and the connecting rings 2502 can be clamped to each other through elastic deformation; the fine aggregate collecting cylinder 21 and the coarse aggregate collecting cylinder 22 are both adhesively bonded with flexible sealing strips 26 on the side facing the gas grading cylinder, the flexible sealing strips 26 in the embodiment can be made of rubber; the side walls of the fine aggregate collecting cylinder 21 and the coarse aggregate collecting cylinder 22 are provided with visual windows 23, and the inner walls of the visual windows 23 are adhesively bonded with transparent observation pieces 24, and the transparent observation pieces 24 in the embodiment can be made of glass.

[0041] The implementation principle of the screening device for preparing metal alloy powder provided in the embodiment of the application is as follows: in use, the rotating member 301 drives the driving gear set 103 to rotate, the driving gear set 103 drives the driven gear set 102 to rotate through the transmission chain 104, and the driven gear set 102 drives the feeding auger 101 to rotate, the rotation of the feeding auger 101 realizes the feeding of the material powder in the storage tank 6, the material powder is impacted and scattered by the scattering blades 302, the phenomenon that the material powder is extruded and agglomerated into the screening device is reduced, the screening precision of coarse material and fine material is improved, and the final screening quality of the material powder is improved.

[0042] The above are preferred embodiments of the application, and do not limit the protection scope of the application, so: equivalent changes made according to the structure, shape, principle of the application should be covered in the protection scope of the application.

Claims

1. A sieving apparatus for metal alloy powder production, characterized by: The application relates to a material powder screening device, which comprises a storage device, a feeding device, a screening device and a collecting device, wherein the feeding device comprises a feeding driving assembly (1), a feeding pipeline (2) and a scattering assembly (3), one end of the feeding pipeline (2) is communicated with the storage device, the other end is communicated with the screening device, the feeding driving assembly (1) is installed on the feeding pipeline (2), the feeding driving assembly (1) is used for driving the movement of material powder in the feeding pipeline (2), the scattering assembly (3) comprises a rotating part (301), scattering blades (302) and an intercepting plate (303), the scattering blades (302) are rotationally connected to one end of the feeding pipeline (2) close to the screening device, the rotating part (301) is used for driving the rotation of the scattering blades (302), the intercepting plate (303) is arranged on the side of the scattering blades (302), and a gap is reserved between the edge of the scattering blades (302) and the intercepting plate (303). The intercepting plate (303) is further provided with a material loading disc (4), one side of the material loading disc (4) towards the screening device is provided with a discharging port, the material loading disc (4) is provided with a vibrating part (5), the vibrating part (5) is used for driving the vibration of the material loading disc (4), and the material loading disc (4) and the intercepting plate (303) vibrate synchronously. The screening device comprises a grading tank (12), a power part (13) and an airflow grading wheel (14), the grading tank (12) is used for enclosing a grading cavity for grading material powder, the power part (13) is installed on the grading tank (12), the airflow grading wheel (14) is installed on the output end of the power part (13), the power part (13) is used for driving the rotation of the airflow grading wheel (14), and the airflow grading wheel (14) realizes the grading of coarse and fine material powder through centrifugal force. The airflow grading wheel (14) is provided with main blades (15), the main blades (15) are uniformly arranged in a circle, the main blades (15) are slidably connected with auxiliary blades (16), the auxiliary blades (16) are rotationally connected with synchronous connecting rods (17), one end of the synchronous connecting rods (17) away from the auxiliary blades (16) is rotationally connected with a fixing bolt (18), the synchronous connecting rods (17) on adjacent auxiliary blades (16) are rotationally connected with each other through the fixing bolt (18), the airflow grading wheel (14) is further provided with an adjusting hole (19), the fixing bolt (18) is slidably connected in the adjusting hole (19), the sliding direction of the fixing bolt (18) is consistent with the sliding direction of the auxiliary blades (16), and the screw rod part of the fixing bolt (18) is threadedly connected with a fixing nut (20).

2. The sieving apparatus for metal alloy powder preparation according to claim 1, characterized in that: The storage device includes a storage tank (6) and an argon conveying device (7) communicated with the storage tank (6), the argon conveying device (7) is used for conveying argon into the storage tank (6), a supporting frame (8) is arranged in the storage tank (6), a detection module (9) is installed on the supporting frame (8), the detection module (9) is used for detecting the material powder state in the storage tank (6), the detection module (9) is electrically connected with a controller (10), the controller (10) is electrically connected with an indicating lamp (11), the controller (10) is used for receiving the material powder temperature and humidity information detected by the detection module (9), and the indicating lamp (11) is controlled to light up after receiving the information, and the corresponding information is displayed.

3. The sieving apparatus for metal alloy powder production according to claim 2, characterized in that: The feeding driving assembly (1) comprises a feeding auger (101), a driven gear set (102), a driving gear set (103) and a transmission chain (104), the driving gear set (103) is connected to the rotating part (301), the rotating part (301) is used for driving the driving gear set (103) to rotate, the feeding auger (101) is rotatably connected to the feeding pipeline (2), the feeding auger (101) is used for driving the material powder in the storage tank (6) to move into the feeding pipeline (2), the driven gear set (102) is connected to the feeding auger (101), the driven gear set (102) is used for driving the feeding auger (101) to rotate, and the driving gear set (103) drives the driven gear set (102) to rotate through the transmission chain (104).

4. The sieving apparatus for metal alloy powder preparation according to claim 3, characterized in that: The driving gear set (103) comprises a plurality of driving gears with different sizes, and the driving gears are coaxially arranged.

5. The sieving apparatus for metal alloy powder preparation according to claim 1, characterized in that: The aggregate collecting device comprises a fine aggregate collecting cylinder (21) and a coarse aggregate collecting cylinder (22), the side walls of the fine aggregate collecting cylinder (21) and the coarse aggregate collecting cylinder (22) are provided with visible windows (23), and the inner walls of the visible windows (23) are connected with transparent observation pieces (24).

6. The sieving apparatus for metal alloy powder preparation according to claim 5, characterized in that: The cylinder opening parts of the fine aggregate collecting cylinder (21) and the coarse aggregate collecting cylinder (22) are provided with quick release assemblies (25), the quick release assembly (25) comprises a connecting claw (2501) and a connecting ring (2502), the connecting ring (2502) is connected to the aggregate collecting device, the connecting claw (2501) is rotatably connected to the fine aggregate collecting cylinder (21) or the coarse aggregate collecting cylinder (22), and the connecting claw (2501) and the connecting ring (2502) are clamped with each other.

7. The sieving apparatus for metal alloy powder production according to claim 6, characterized in that: The fine aggregate collecting cylinder (21) and the coarse aggregate collecting cylinder (22) are provided with flexible sealing strips (26) on the sides facing the aggregate collecting device.

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