EP3541523A1

EP3541523A1 - Mill

Info

Publication number: EP3541523A1
Application number: EP17800435.4A
Authority: EP
Inventors: Marc Giersemehl; Thomas Mingers; Joachim Galk
Original assignee: Neuman & Esser Process Tech GmbH; Neuman & Esser Process Technology GmbH
Current assignee: Neuman & Esser Process Tech GmbH; Neuman & Esser Process Technology GmbH
Priority date: 2016-11-15
Filing date: 2017-11-02
Publication date: 2019-09-25
Anticipated expiration: 2037-11-02
Also published as: US11192117B2; KR20190077362A; JP2023015281A; BR112019009858A2; DE102016121926B4; US20190344283A1; DE102016121926A1; JP7358598B2; ES2816006T3; CN109963654A; KR102560955B1; JP2019535514A; EP3541523B1; CN109963654B; WO2018091276A1

Abstract

A mill (10), in particular a pendulum mill or roller mill, having a classifier (100) is described, wherein the mill (10) has a mill housing (20) with an interior (20a) in which there is situated a milling space B1 in which a milling device (80) having at least one milling tool (81) is arranged. The classifier (100) is arranged above the milling device (80) in a classifying space B3. At least one drop device (60) is provided which connects the classifying space B3 to the milling space B1. Arranged below the classifier (100) is at least one distribution plate (40) which has at least one drop opening (42) on which the at least one drop device (60) is arranged.

Description

Mill

description

The present invention relates to a Mühie according to the preamble of claim 1.

Mills are used to crush solids such as coal, minerals or pigments. Depending on the type of construction, a distinction is made between pendulum mills, impact mills, bowl mills, roller mills or jet mills, this list being only an example.

Pendulum mills are characterized by their grinding tools designed as pendulums. These pendulums are suspended from a crosshead, which sits on a shaft, and are pressed by the rotational movement of the shaft and the crosshead radially outward and against a grinding track located there. Ground material gets during the grinding process between Mahlpendel and grinding track and is there crushed.

The comminuted material is subsequently sighted. During the screening, the sufficiently small particles (fine material) are removed and particles with too large a particle size (coarse material) are returned to the mill for further comminution. In this way, a material cycle is created, which particles run through until the desired particle size is reached.

Such a pendulum mill is known for example from DE 10 2009 051 226 A1. In this known pendulum mill, a separator is arranged directly above the grinder. The return of the coarse material via a screw, by means of which the coarse material is first conveyed from the area between sifter and pendulum mill to outside with fresh feed, so the solid to be ground, to be mixed. Subsequently, this mixture is fed to the pendulum mill above the grinding area. This recycling is very expensive and energy-intensive.

Another approach is US 5,330,110, which discloses a pendulum mill with integrated sifter and a Partikelumwälzeinrichtung. During particle recirculation, all particles are accelerated radially outward by a rotor and impinge on the outer wall of the pendulum mill. There separate coarse and fine particles. Added to this are the coarse particles produced at the sifter. All coarse particles are returned through downspouts outside of the mill housing to an area below the pendulum. Due to the flow generated within the mill housing, the coarse particles are again transported from below into the grinding area and further comminuted.

Similarly, the pendulum mill of US 5,279,466 is constructed. There, however, the coarse material is introduced from above into the grinding area. In both cases, the space of the pendulum mill increases, which is disadvantageous.

Alternatively, the recirculation of the coarse material according to US 4,830,290 also take place inside the mill housing. In this type of recycling, however, opposing flows arise: those of the ascending, moving in the direction of the separator particles and the falling particles of coarse material. These two currents hinder each other, which among other things causes particles that have not yet been spotted to be carried along by the coarse material. As a result, particles that are already small enough land again in the grinding area and may be further crushed. This is undesirable. Overall, the opposite flows lead to increased power consumption and lower throughput of the mill. US 2009/0121060 A1 attempts to solve this problem by arranging a tubular insert in the mill housing. Between the insert and the outer wall of the mill housing an annular space is formed, which is provided for the falling particles of the coarse material. The rising from the mill area particles, however, are located inside the insert. In this way, the two particle flows are to be separated, whereby the described disadvantages are to be avoided.

However, the solution of US 2009/0121060 A1 is disadvantageous for several reasons. For one, the annulus is very narrow and it is questionable whether the coarse material actually finds its way into the annulus. In addition, there is a possibility that the annulus clogged. Finally, the immediate return to the Mahlpendel is not guaranteed. The coarse material passes through the annulus in an area laterally above the grinding rollers. Due to the rising flow, there is the possibility that particles are not further comminuted at all, but are directly entrained again by the flow and fed to the separator. This reduces the throughput of the mill because the particles must go through the entire cycle again.

From DE 10 2011 014 592 A1 a roller mill with integrated sifter is known, which has a grinding bowl, which rotates about a longitudinal axis of the mill. The grinding bowl is provided with a grinding track on which a grinding bed is formed by the feed material. On the grinding bed stationarily arranged grinding rollers roll off.

The coarse material rejected by the classifier falls into a semolina cone, which on the bottom side has an opening which allows a central feed of the coarse grain onto a distribution cone. Due to turbulence in the grinding chamber, only a part of the recirculated coarse material reaches the grinding rollers. It is therefore an object of the invention to provide a mill that allows higher throughput than previous mills.

This object is achieved by a mill having the features of claim 1.

The mill has a mill housing with an interior, in which a grinding chamber B1 is located, in which a grinder is arranged with at least one grinding tool. The separator is arranged above the grinder in a viewing space B3 and has a viewing zone. At least one trap device is provided which connects the viewing zone to the grinding chamber. The mill is characterized in that at least one distribution plate is arranged under the separator, which has at least one drop opening on which the at least one trap device is arranged.

The mill is preferably a pendulum mill with a rotatably arranged grinder having at least one grinding tool. The grinding tool preferably has a Mahlpendel with a rotatably mounted grinding roller or grinding roller, which rotates for example on a stationary Mahlring. According to a further embodiment, the mill can be a roller mill with a stationary grinding device which has at least one grinding tool. The grinding tool preferably has a stationary mounted Mahlpendel with a rotatably mounted grinding roller or grinding roller, which cooperates, for example, with a rotating Mahischüssel.

The grinding path is the surface on which rolls the grinding roller or grinding roller on the Mahlring or the grinding bowl.

The longitudinal axis X of the mill is preferably a vertical axis and preferably identical to the axis of rotation of the mill. The coarse material rejected by the separator falls onto the distribution plate arranged under the separator and from there passes through the at least one drop opening into the relevant trap device. This has the advantage that the coarse material is immediately channeled within the mill housing, so that it largely does not come into contact with the grinding material / air stream flowing up from the grinding chamber. Through this type of separation of the two streams, the throughput of the mill could be increased by up to 20%. As a result, more grinding stock per unit time can be comminuted with the mill according to the invention and the mill can be operated correspondingly more economically.

The interior of the mill housing of the mill is in the direction of gravity, d. H. from top to bottom, divided into three areas. In an upper area is the viewing space, which preferably extends from a mill ceiling to a lower edge of the classifying wheel. In a lower area is the grinding chamber, in which the grinding rollers of the grinding tools are arranged. Between these two rooms there is a transport room in which the milled material is transported upwards to the sifter and the coarse material rejected by the sifter falls downwards.

The valve disk is located in the transport space, preferably in the upper area of the transport space.

Preferably, the diameter of the distribution disc is greater than or equal to the diameter of the classifier wheel, in particular greater than or equal to the outer diameter of the classifier. This ensures that all coarse material falling out of the sifter's classifier zone is captured by the distribution plate.

Preferably, a circumferential boundary wall is arranged between the separator and the distribution plate. The boundary wall prevents that from the Grower falling down next to the distribution plate and thus does not fall into the drop opening.

Preferably, the height of the peripheral boundary wall is equal to or less than the distance between the separator and distribution plate. Preferably, the boundary wall has an upper circular rim and a lower circular rim. The diameter of the upper circular edge is preferably greater than the inner diameter of the vane ring, in particular larger than the outer diameter of the vane ring. The diameter of the lower circular edge is preferably smaller than the diameter of the distribution disc.

Depending on the dimensions of the diameter of the separator and distribution plate, the peripheral boundary wall may be a cylinder or a cone. A cone-shaped boundary wall with a smaller diameter of the lower edge than the diameter of the upper edge is used in particular if the diameter Dv of the distribution plate is smaller than the diameters Di or D2.

The peripheral boundary wall is preferably fixedly attached to the classifier housing.

In order to distribute the coarse material as evenly as possible, the distribution plate has a plurality of drop openings and thus also a plurality of trap devices.

Preferably, a plurality of drop holes are provided in the distribution disc, which are arranged distributed on a circle K1 about the longitudinal axis X of the mill, wherein the diameter of the circle K1 is preferably in the range between the diameter of the classifier wheel and the outer diameter of the classifier. In order to prevent a collision of the falling coarse material with the upflowing regrind / air flow, a cylindrical wall can be additionally arranged between the separator and the distribution plate. The diameter of the cylindrical wall preferably corresponds to the diameter of the distribution plate.

Preferably, the at least one trap device is arranged in the interior of the mill housing, in particular within the transport space. The advantage is that thereby a compact design of the mill can be realized.

A further advantage of the trap device is that the coarse material not only reaches the grinding chamber by means of the trap device, but can also be discharged there in a targeted manner at the location where the grinding process takes place.

Preferably, the at least one trap device extends to the respective grinding roller or grinding roller.

In this way, the two flows (coarse material from the classifier to the grinding chamber and ground material from the grinding chamber to the classifier) are separated even more effectively. Opposite flows, which hinder each other and cause turbulence, are largely avoided, not only in the transport space but also in the grinding chamber.

In order to bring the coarse material as close as possible to the area in which it is to be ground, it is provided in an advantageous development that the at least one trap device is assigned to at least one grinding tool and that the trap device extends in the grinding chamber up to the respective grinding tool. Preferably, the at least one trap device extends to the respective grinding roller or grinding roller.

In advantageous developments of the mill, it is provided that at least one latching device is arranged between two grinding devices. Preferably, in each case a fail device is arranged between each two grinding tools. Particularly preferably, the mill has the same number of grinding tools, drop holes and trap devices.

Particularly preferably, at least one outlet of the trap device is directed onto the mill base and / or a grinding track and / or a grinding roller.

The outlet direction of the outlet of the trap affects the grinding process. The outlet direction is understood to be the direction in which the coarse material flows from the trap device after leaving the fail device. The outlet direction is arranged in particular perpendicular to an outlet surface of the outlet. The outlet surface is in particular a surface which closes the outlet opening in the trap device. Preferably, the outlet surface is a plane parallel to the longitudinal axis of the mill.

In advantageous developments of the mill, it is provided that a horizontal component of the outlet direction of at least one failing device lies in an outlet angle γ to a radial direction of a circle K2 on which the trap devices are arranged, where 70 ° <γ <110 °.

In this case, the radial direction is considered for a particular outlet, which runs through the vertical axis of the associated trap device. The intersection of the radial direction to be considered with the outlet direction lies on the vertical axis of the associated trap device. The radial direction and the outlet direction form the outlet angle γ. The circle K2 is a circular path, on the the high axes of the trap devices are located or on which the vertical axes of the trap devices move when used as intended, as is preferably the case when used in a pendulum mill. In this way, the coarse material emerges substantially in or against the direction of rotation of the trap devices. The exit against the direction of rotation has the consequence that less turbulence in the grinding chamber arise.

Also advantageous is an arrangement of the horizontal component of the outlet direction of at least one trap device to the radial direction in an outlet angle γ, where -30 ° <γ <+ 30 °. As a result, the exit of the coarse material takes place substantially along the radius of the circle K2. In this case, the outlet port may be directed inward from the circle K2 toward the center or outward. If the outlet opening directed to the outside, so the coarse material passes in the direction of the grinding path, whereby the coarse material passes directly into the area in which it is to be ground.

In advantageous developments of the mill, it is provided that at least one trap means tapers at the lower end or has a smaller cross-section than the rest of the trap means. This embodiment of the trap device is used in particular when only a small amount of coarse material has to be transported from the viewing zone into the grinding area. If the opening for the coarse material is too large in relation to the amount of coarse material, insufficient flow may occur.

The at least one trap device preferably has a curved section with an outlet at a lower end.

Thereby, the outlet of the trap device can be aligned so that the coarse material from a trap device in a certain direction, in a certain th area of the mill or on a specific component of the mill is transported.

Preferably, the trap device comprises a trapped in the interior of the mill housing case space, a downpipe and / or a drop hose. The fall space can be separated, for example, by appropriate internals within the mill housing. The cross section of the trap devices can be chosen arbitrarily, with round or polygonal cross sections are preferred for manufacturing reasons.

According to a particular embodiment, the mashing device and the at least one latching device are arranged rotatable about the longitudinal axis X. The common rotation of grinder and trap or trap means is preferably used in a pendulum mill.

Preferably, the Verteifteller is arranged on a rotating grinder.

The pendulum mill has a drive shaft to which the grinder is attached. The grinder preferably has a crosshead on which the Mahlpendel are suspended. Preferably, the at least one distribution disc is attached to a drive shaft of the mill or to a crosshead attached to the drive shaft.

Due to the arrangement of the fall openings and thus also of the latching devices on a circle, a uniform load distribution for the crosshead and the drive shaft is made possible. Other arrangements can lead to uneven stress, in particular the drive shaft, which reduces their life. The material to be ground (regrind) tends to deposit on a mill base of the mill housing. In an advantageous development of the mill, at least one blade is arranged in the mill housing, wherein each blade is associated with a trap device. The blades are preferably arranged on the mill base and also rotate about the axis of rotation X and transport the material to be ground from the mill base in the direction of the respective grinding roller or the grinding path.

Preferably, at least one outlet of the trap is directed to a blade.

The invention will be illustrated and explained by way of example with reference to FIGS. Show it:

1 shows a pendulum mill in a perspective, sectional view,

2 shows the grinder of the pendulum mill with distribution plate according to FIG

1 in a perspective view,

3 shows a distribution plate of the Pendeimühle in a plan view,

Figure 4 shows the distribution plate and the downpipes of a pendulum mill in a perspective view

Figure 5 shows the distribution plate and the downpipes of a Pendeimühle according to another embodiment in a perspective view and Figure ö is a schematic representation of parts of a pendulum mill according to another embodiment.

Figure 1 shows an embodiment of a mill 10, which is designed as a pendulum mill. The pendulum mill 10 has a longitudinal axis X, which also forms the axis of rotation at the same time. The pendulum mill 10 has a mill housing 20 with an inner space 20 a, which is bounded by a peripheral wall 22, a mill cover 25 and a mill base 21.

The interior 20a of the mill housing 20 is subdivided into three spaces B1, B2 and B3, which are referred to as grinding space B1, transport space B2 and viewing space B3.

In the viewing space B3 of the classifier 100 is arranged, which has a Sichterrad 10 with the diameter Di. By means of a sifter shaft 1 14, the Sichterrad 1 10 is driven. The classifier 100 also has a stator ring 110 surrounding the classifier wheel 110, which has the outer diameter D2. Between the Sichterrad 1 10 and the vane ring 1 1 1 is the viewing zone 102 of the classifier 100th

Under the classifier 100 is a grinder 80 with a crosshead 88 and three grinding tools 81 in the form of Mahlpendeln 82, two of which are shown. Each Mahlpendel 82 has a pendulum shaft 84 with a grinding roller 86. The grinding rollers 86 are located in the grinding chamber B3.

The Mahlpendel are pivotally mounted on the crosshead 88. When used as intended the Mahlpendel 82 are pressed against the grinding path 23 of the grinding ring 27 of the mill housing 20. Between the grinding chambers 86 and the grinding track 23, the material to be ground is ground. Below the mill housing 20, a drive device (not shown) is arranged, which drives a drive shaft 30. The drive shaft 30 extends from the lifting device into the mill housing 20. The crosshead 88 of the grinder 80 is disposed at the upper end 34 of the drive shaft 30.

The grinding chamber B1 extends from the mill base 21 up to an upper edge 26 of the grinding track 23. The viewing space B3 extends from a mill ceiling 25 to a lower edge 16 of the classifying wheel 1 10. Between the rooms B1 and B3 is the transport space B2, in which the distribution plate 40, the crosshead 88 and the pendulum shaft 84 are arranged. The Mahlpendel 82 extend from the crosshead 88 into the grinding chamber B1.

In the transport space B2, a distribution plate 40 with a diameter Dv is arranged above the crosshead on the drive shaft 30, which is larger than the outer diameter D2 of the classifier 100. The distribution plate 40 is rotatably driven by the drive shaft 30 when used as intended. As a result, the distribution plate 40 also rotates about the axis of rotation X. The distribution plate 40 has a round disc, in the case openings 42 are arranged. In the middle of the distribution plate 40, a distributor cone 43 is arranged. Of the several fall openings 42, only one drop opening 42 is shown, to which a downwardly extending trap 60 is attached in the form of a drop tube.

In operation, the grinding material air flow in the transport space B2 rises upward, which is indicated by the arrows P1. At the same time, the coarse material is rejected by the classifier 00 in the viewing zone 102 and falls down on the distribution plate 40, which is indicated by the arrows P2. Between the classifier 100 and the distribution plate 40, a circumferential boundary wall 130 is arranged, the contact of the currents P1 and P2 in the upper region of the transport space B2 prevented. The boundary wall 130, which is arranged stationary, is designed as a cylinder whose height is less than / equal to the distance between the separator 100 and distribution plate 40. The diameter of the upper edge of the cylinder is greater than the diameter D2 of the classifier 100. The diameter of the lower cylinder edge is less than or equal to the diameter Dv of the distribution plate 40.

On the mill housing 20, a Mahlgutversorgung 90 is arranged, which has a chute 92 which extends from an area outside of the mill housing 20 into the interior of the mill housing 20. A Mahlgutauslass 94 is disposed above the grinding chamber B1 in the transport space B2. Through the Mahlgutversorgung 90, the material to be ground, is introduced into the mill housing.

Above the classifier 100, a suction device 1 12 is arranged. The suction device 112 is in communication with the interior of the separator wheel 110 and generates a flow which serves to cause the material ground between the grinding rollers 86 and the grinding path 23 to rise upwards. The material flows from the grinding chamber B1 outside the boundary wall wall 130 through the transport space B2 and into the viewing space B3. In the viewing space B3, the material is initially outside the guide vane ring 1 1 of the classifier 100. By the flow generated by the suction device 1 12, the material passes through the vane ring 11 1 in the viewing zone 102. By Sichterrad 110, the material in coarse material and Fines separated. The fine material enters the interior of the classifier wheel 1 10 and is transported by the suction device 1 12 from the mill housing 20. The coarse material is rejected by the Sichterrad 1 10 and falls - as already described - on the distribution plate 40th FIG. 2 essentially shows the arrangement of the grinding device 80 in combination with the distribution plate 40 with the distributor cone 42 arranged on the upper side 45 and the latching devices 60 from FIG. 1. Further parts of the reciprocating mill are hidden for reasons of illustration.

The distribution plate 40 has three drop holes 42 which are arranged on a circle Ki. The center of the circle Ki is located in the axis of rotation X. The drop holes 42 are arranged on the circle Ki at equal angular intervals about the axis X around. D denotes the direction of rotation of the distribution plate 40. Falling means 42 have latching devices 60 which are designed as downpipes.

In the illustration shown here, the pendulum mill 10 has three downpipes 60. Along an orbit U (circle K2) of the downpipes 60, a grinding pendulum 82 is arranged in each case between two downpipes 60. Also, a downpipe 60 is disposed along the orbit U between each two Mahlpendeln 82. The fail tubes 60 are interconnected by struts 68 with each other. By the struts 68 vibrations of the downpipes 60 are prevented during operation. Shovels 24 are shown below the downpipes 60, which are connected to the drive shaft 30 via a support structure 28 and are rotationally driven thereby. The blades 24, which have been deposited on the mill base 21, are moved in the direction of the grinding track 23 in order to be ground between the grinding rollers 86 and the grinding track 23.

Each blade 24 is thus associated with a drop tube 60. In the present case, the outlets 62 of the downpipes 60 are aligned so that the material from the downpipe 60 after exiting the outlet 62 directly impinges on the blade 24 and is thereby immediately supplied to the grinding roller 86. In the figure 3, the plan view of the distribution plate 40 is shown enlarged. It can be seen that the drop holes 42 are arranged on the circle Ki. In the center of the distribution plate 40 is the distributor cone 43.

FIG. 4 illustrates an embodiment in which each drop tube 60 tapers at a lower end 64 and merges there into a curved section 61.

Another embodiment is shown in FIG. The downpipes 60 do not taper, but each have a curved portion 61 at a lower end 64.

FIG. 6 shows a schematic bottom view of the milling device 80 with different arrangements of the downpipes 60. Each downpipe 60 has a vertical axis H. The drop holes 42 of the downpipes 60 are arranged on a circle Ki about the rotation axis X. The circle Ki has radial directions R. Of the radial directions R are shown, which extend through the vertical axes H of the downpipes 60. The downpipes 60 each have an outlet direction A. In FIG. 6, all outlet directions A are horizontal. The outlet directions A are each arranged at an angle γ to the radial direction R of the associated downpipe. In two of the illustrated downpipes 60, the angle γ between -30 ° and + 30 °, in the other two downpipes 60, the angle γ between 70 ⁰ and 1 10 °. Reference list mill, pendulum mill mill housing

inner space

Mühleboden

peripheral wall

grinding track

shovel

mill ceiling

top edge

grinding ring

Carrier structure drive shaft

upper end distribution plate

case opening

distributor cone

Top of the trap, downpipe

curved section

outlet

lower end

Strive grinder 81 Grinding tool

82 Mahlpendel

84 pendulum shaft

86 grinding roller

88 crosshead

90 regrind supply

92 slide

94 regrind outlet

100 classifiers

102 viewing zone

110 classifier wheel

111 vane ring

112 suction device

114 sifter shaft

116 lower edge

130 boundary wall

B1 grinding chamber

B2 transport space

B3 view room

A outlet direction

D Direction of rotation of the distribution disc

Di diameter of classifier wheel

D ₂ outer diameter of the vane ring, outer diameter of the classifier

Dv diameter of the distribution plate H vertical axis

Ki circle

K2 circle

P1 flow arrow

P2 flow arrow

R radial direction

Underground orbit

X axis of rotation, longitudinal axis γ angle

Claims

claims

1 . Mill (10), in particular pendulum mill or Wälzmühle, with a

Longitudinal axis X and with a separator (100), wherein the mill (10) has a mill housing (20) with an interior space (20a) in which a grinding chamber (B1) is located, in which a grinder (80) with at least one grinding tool (81) is arranged, wherein the classifier (100) over the grinder (80) in a viewing space (B3) is arranged and a viewing zone (102), and wherein at least one trap means (60) is provided, the viewing space (B3 ) with the grinding chamber (B1), characterized in that at least one distribution plate (40, 140) is arranged below the classifier (100), which has at least one fail opening (42) on which the at least one trap device (60) is arranged ,

2. Mill according to claim 1, characterized

the diameter Dv of the distribution disc (40) is greater than or equal to the diameter Di of the classifying wheel (110).

3. Mill according to claim 1 or 2, characterized in that a peripheral boundary wall (130) is arranged between the classifier (100) and the distribution plate (40).

4. Mill according to one of claims 1 to 3, characterized in that in the at least one distribution plate (40) a plurality of fall openings (42) are provided, which are arranged on a circle Ki.

5. Mill according to one of claims 1 to 4, characterized in that the at least one trap means (60) in the interior (20 a) of the mill housing (20) is arranged.

6. Mill according to one of claims 1 to 5, characterized in that the at least one trap means (60) is associated with at least one grinding tool (81), and that the trap means (60) in the grinding chamber (B1) up to the respective grinding tool (81) extends.

7. Mill according to one of claims 1 to 6, characterized in that between two grinding tools (81) in each case at least one trap device (60) is arranged.

8. Mill according to one of claims 1 to 7, characterized in that at least one outlet (62) of the trap device (60) on a mill base (21) and / or a grinding track (23) and / or a grinding roller (86) is directed ,

9. Mill according to one of claims 1 to 8, characterized in that a horizontal component of an outlet direction A of the outlet (62) at least one trap means (60) at an angle γ to a Radial direction R of a circle K2 is located on which the latch means (60) are arranged, wherein 70 ° <γ <110 °.

10. A mill according to one of claims 1 to 9, characterized in that a horizontal component of an outlet direction A of the outlet (62) of at least one latching device (60) lies at an angle γ to a radial direction R of a circle K2 on which the latching devices ( 60), wherein -30 ° <γ <+ 30 °.

1 1. Mill according to one of claims 1 to 10, characterized in that at least one trap means (60) at a lower end (64) tapers or has a smaller cross section than the rest of the trap means (60).

12. Mill according to one of claims 1 to 1 1, characterized in that the at least one latching device (60) at a lower end (64) has a curved portion (61) with an outlet (62).

13. Mill according to one of claims 1 to 12, characterized in that the Schachtinnchtung (60) comprises a in the interior (20 a) of the mill housing (20) separated drop space, a downpipe and / or a drop hose.

14. Mill according to one of claims 1 to 13, characterized in that the grinder (80) and the at least one fail device (60) are arranged rotatably about the longitudinal axis X.

15. Mill according to one of claims 1 to 14, characterized in that the distribution plate (40) is arranged on a rotary grinder (80). Mill according to one of Claims 1 to 15, characterized in that the at least one distribution plate (40) is fastened to a drive shaft (30) of the mill (10) and / or to a crosshead (88) fixed to the drive shaft (30).

Mill according to one of claims 1 to 16, characterized in that in the mill housing (20) at least one Schaufei (24) is arranged, wherein each blade (24) is associated with a trap device (60).

Mill according to one of claims 1 to 17, characterized in that at least one outlet (62) of the trap means (60) is directed towards a blade (24).