DE10305915A1 - Rolling mill for e.g. dig-damp hard coal, includes driver with a ring engine that is concentric to a hollow shaft which in turn directly propels a meal plate, the shaft connected with a rotor - Google Patents

Abstract

A driver (10) has a ring engine that is concentric to a hollow shaft (17) which in turn directly propels a meal plate (5), the shaft connected with a rotor (4).

Description

The invention relates to a roller mill at least one grinding roller and a horizontally arranged grinding bowl which has a rolling surface for the grinding roller (s) is formed, whereby between the grinding roller (s) and the rolling surface of the grinding bowl guided comminution is finely ground, and the lower area of the grinding bowl with a vertically aligned shaft or hollow shaft is formed and the grinding bowl by a drive in a rotating movement around its vertical Axis of rotation is offset.

Through the publication "Large EVT coal mills: - Basics for the Interpretation, - operational experience and development opportunities "by Dr. Bodo Gehrke from EVT register 44/1985, pages 37 to 48 generic roller mills have become known, the grinding pan with integrated worm gears (the vertical grinding bowl shaft is designed with a worm gear - Figure 9) or bevel-helical gear are driven. For roller mill drives with bevel-helical gear, the grinding bowl is directly with the lower one Gearbox connected (Figure 8), taking the vertical force off the grinding process when using this gearbox usually with tilting segment bearings takes place, which are integrated in the bevel-helical gear units.

Furthermore, roller mills with bevel gear planetary gears are, for example, by the document DE 100 13 097 A1 known. In these gearboxes, the vertical force is usually also taken up with tilting segment plain bearings integrated in the gearboxes and the grinding bowl is also placed directly on the gearbox.

It turns out to be disadvantageous for everyone these aforementioned roller mill drive systems, that an elaborate Gearbox and bearing design are needed that a variety of components and that high manufacturing tolerances and processing qualities are observed Need to become. The elaborate Gearbox designs also have many mechanical wear parts such as Gears and Bearings whose repair or maintenance cause high costs. Through the laterally arranged electric drive motor of the reduction gear the space requirement for the roller mill installation certainly.

The present invention has been accomplished now tasked with creating a roller mill in which the the aforementioned disadvantages are avoided or in which the roller mill with a drive and a bearing is formed, the simple Has structure, inexpensive and is easy to maintain.

This task is characterized by the Features of claim 1 solved.

Advantageous embodiments of the Invention are the dependent claims remove ro.

• – weniger benötigte Bauteile und durch eine kostengünstigere Bauweise,
• – eine Reduzierung bzw. Minimierung der mechanisch berührten Teile auf ein einziges Wälzlager,
• – Verwendung größerer Fertigungstoleranzen,
• – eine Reduzierung des Reparatur- und Wartungsaufwandes,
• – ein platzsparendes Gesamtkonzept,
• – eine Reduzierung der Gesamtmasse und Verringerung des Wälzmühlengewichtes.

The solution according to the invention creates a roller mill in which the grinding bowl of the roller mill is driven by a gearless direct drive in the form of a ring motor, which is arranged concentrically to the grinding bowl shaft and the grinding bowl shaft or hollow shaft and the ring motor by a single axial and radial forces and Rolling bearing absorbing tilting moments is supported and connected to it. The solution according to the invention is characterized by

• - less required components and a more cost-effective design,
• A reduction or minimization of the mechanically touched parts to a single rolling bearing,
• - use of larger manufacturing tolerances,
• - a reduction in repair and maintenance work,
• - a space-saving overall concept,
• - a reduction in the total mass and reduction in the weight of the roller mill.

It is advantageous to use the ring motor on the outer circumference the grinding bowl shaft to arrange or hollow shaft, as a construction simple solution is achievable and also the ring motor for assembly and maintenance purposes easily accessible is. In a further advantageous embodiment of the invention outer periphery the shaft or hollow shaft is cylindrical in the area of the ring motor.

In an expedient embodiment of the invention is the grinding bowl wave or hollow shaft and thus also the grinding bowl of the roller mill with the rotating inner ring of a rolling bearing and firmly connected to the ring motor rotor and via this rotating inner ring of the rolling bearing rotatably mounted. This configuration enables one simple and inexpensive Construction structure of all to achieve the aforementioned components. The same is true if the ring motor stator advantageously over a motor housing and the stationary outer ring of the rolling bearing with the drive stand is firmly connected.

For the installation and removal of the ring motor stator and / or -Rotor, it is useful to stator and / or Rotor over the To divide the scope into several segments, which can preferably be the same size.

An advantageous embodiment of the invention has a cooling jacket for the passage of a coolant, for example water, within the ring motor housing. Another advantageous embodiment provides a cooling air supply to the ring motor. With the respective measures, a reliable cooling of the ring motor can be achieved. To increase The air cooling can expediently be connected to the grinding bowl shaft or hollow shaft or the ring motor rotor with a fan wheel.

A particularly advantageous embodiment of the Invention provides a four-point bearing as a rolling bearing for storage or recording the grinding bowl including of the ring motor. This bearing enables self-alignment the grinding bowl shaft or - hollow shaft.

Below are exemplary embodiments the invention with reference to the drawing and the description explained in more detail.

Show it

1 a roller mill in longitudinal section,

2 the grinding bowl hollow shaft with ring motor as a partial section of the roller mill.

roller mills 1 according to 1 are suitable, among other things, for grinding and drying moist raw materials, such as pit-damp hard coal. The raw material is usually centered on the vertical roller mill axis 26 arranged raw material task 7 on the grinding bowl or the grinding plate 5 brought in. The horizontally arranged and around the vertical roller mill axis 26 rotating grinding bowl 5 has, for example, a conical rolling surface 25 for at least one grinding roller 6 on, whereby between the grinding roller or grinding rollers 6 and the rolling surface 25 the grinding bowl 5 guided ground or comminuted material is finely ground. In addition to the essential grinding tools, grinding bowl 5 and grinding roller (s) 6, the roller mill 1 essentially has a mill substructure 2 , a mill housing 3 , a mill sifter 4 and a drive 10 for driving the grinding bowl 5 on.

The drying or carrying gas required for drying and conveying the ground material is fed through the carrying gas inlet opening 9 the roller mill 1 fed. After the ground material has been dried by the drying or carrier gas, the ground dust is transferred from the carrier gas to the classifier's classifier 4 promoted and separated or viewed according to particle size. The fine dust flows after it has passed the mill classifier 4 through the fine dust outlet openings 8th from the roller mill 1 and is used for further use. Coarser material is created by the centrifugal forces in the mill classifier 4 separated and gets back on the grinding bowl 5 ,

The grinding bowl 5 is for their storage and drive in their lower area with a vertically aligned grinding bowl shaft or grinding bowl hollow shaft 17 trained, with larger roller mills 1 usually hollow shafts 17 , as in 1 and 2 shown. The grinding bowl 5 can be with the hollow shaft or with the shaft 17 be formed from a single part, but it can also conveniently, as in 1 and 2 shown, from several interconnected individual parts 17a . 17b be formed, the items 17a . 17b if necessary can be conical and / or cylindrical.

The drive of the grinding bowl 5 the roller mill according to the invention 1 takes place in such a way that in the lower area 17b the grinding bowl shaft or grinding bowl hollow shaft 17 a ring motor 12 concentric to the shaft or hollow shaft 17 is arranged and the ring motor rotor 14 of the ring motor 12 with the shaft or hollow shaft 17 is connected and thus drives them directly without the aid of further reduction gears or transmission devices. When using a hollow shaft 17 is the ring motor 12 in a radial view, preferably on the outer circumference of the hollow shaft 17 arranged so that seen radially from the inside out with the shaft or hollow shaft 17 connected ring motor rotor 14 to the hollow shaft 17 and the stationary ring motor stator 13 as well as the motor housing 27 follows.

The drive 10 the roller mill according to the invention 1 comes with a single rolling bearing 11 trained, which is suitable by the grinding process on the grinding bowl 5 and caused by their own weight and from the grinding bowl 5 or their shaft or hollow shaft 17 transferred axial and radial forces as well as tilting moments and on the drive stand 18 and to transfer the mill foundation, not shown. As a particularly suitable roller bearing 11 a four-point bearing known from the prior art is preferably used. For this, as in 2 shown, the outer or fixed ring of the rolling bearing 11 on the drive stand 18 supported and with this by means of connecting means, not shown, for. B. screws connected. The outer ring of the rolling bearing 11 in turn supports the motor housing connected to it 27 and the associated ring motor stator 13 while the rotating inner ring of the rolling bearing 11 the rotating components associated with it grinding bowl 5 and their shaft or hollow shaft 17 as well as the ring motor rotor 14 picks up or supports. The shaft or hollow shaft 17 is to the inner ring of the rolling bearing by means of connecting means, not shown, for example annular drive disks equipped with screws 11 as well as with the ring motor rotor 14 connected. The aforementioned components are all - and in an obligatory manner - concentric to the roller mill axis 26 aligned, which is also the axis of rotation of the grinding bowl 5 represents.

To facilitate the installation and removal of the ring motor stator 13 and / or rotor 14, the stator 13 and / or the rotor 14 be divided over the circumference into several segments, which can preferably be the same size. For example, you can six segment parts each are provided.

As already mentioned above, is used as a rolling bearing 11 preferably a four-point bearing is used, which enables the grinding bowl shaft or hollow shaft 17 to be self-aligned in the vertical without stressing the bearing by tilting. In addition to the preferred four-point bearing, other rolling bearings can be used 11 which are suitable for simultaneously transmitting axial and radial forces and tilting moments such as crossed roller bearings, double-row angular contact ball or roller bearings, three-row axial-radial roller bearings, etc. The roller bearing 11 is lubricated by known means using oil. It is expedient to supply the lubricating oil to the rolling bearing via a lubricating oil supply 19 in the fixed outer bearing ring 11 supply. For return, the oil is in a in the drive stand 18 example, annular oil sump located 21 collected and via return openings 20 derived.

For cooling the ring motor 12 can the ring motor stator 13 with a coolant jacket 15 that in the motor housing 27 seen radially outside the ring motor stator 13 is arranged to be formed. The coolant, for example water, becomes the coolant jacket 15 via one on the outside of the motor housing 27 horizontal coolant supply 22 and coolant removal 23 fed in and out.

Further cooling of the ring motor 12 can by cooling air 24 take place, which is conveniently via the motor housing 27 to the ring motor 12 is supplied and the annular gap between the ring motor stator 13 and ring motor rotor 14 flows through. There is a fan wheel to support the cooling air circulation 16 provided, which expediently with the shaft or hollow shaft 17 or the ring motor rotor 14 connected is. After the ring motor has passed, the cooling air can escape to the outside.

1

roller mill

2

mill base

3

mill housing

4

mill classifier

5

Grinding bowl or -Plate

6

grinding roll or role

7

Rohgut task

8th

particulate matter outlet

9

Supporting gas inlet

10

drive

11

roller bearing

12

Insert engine

13

Ring motor stator

14

Ring motor rotor

15

Coolant jacket

16

fan

17

Grinding pan wave or hollow shaft

17a

Grinding pan wave or hollow shaft, upper area

17b

Grinding pan wave or hollow shaft, lower area

18

drive stand

19

Lubricating oil supply

20

Oil recycling

21

Oil drip pan

22

Coolant supply

23

Coolant removal

24

Cooling air supply

25

rolling surface

26

Wälzmühlenachse or axis of rotation

27

motor housing

Claims (11)

Rolling mill with at least one grinding roller and a horizontally arranged grinding bowl on which a rolling surface for the grinding roller (s) is formed, as a result of which comminution material guided between the grinding roller (s) and the rolling surface of the grinding bowl is finely ground, and the lower region of the grinding bowl with a vertical one aligned shaft or hollow shaft is formed and the grinding bowl is driven by a drive in a rotating movement about its vertical axis of rotation, characterized in that the drive ( 10 ) as a ring motor ( 12 ) which is concentric with the grinding bowl shaft or grinding bowl hollow shaft ( 17 ) is arranged and the rotor (4th ) of the ring motor ( 12 ) the shaft or hollow shaft ( 17 ) drives directly and the grinding bowl shaft or hollow shaft (17) and the ring motor ( 12 ) by a single axial and radial force as well as tilting moment absorbing roller bearing ( 11 ) is supported and connected to it. Rolling mill according to claim 1, characterized in that the ring motor ( 12 ) on the outer circumference of the grinding bowl shaft or grinding bowl sel hollow shaft ( 17 ) is arranged. Rolling mill according to claim 1 or 2, characterized in that the grinding bowl shaft or hollow shaft ( 17 ) with the inner ring of the rolling bearing ( 11 ) and with the ring motor rotor ( 14 ) is firmly connected and via the rotating inner ring of the rolling bearing ( 11 ) is rotatably mounted. Rolling mill according to one of the preceding claims, characterized in that the ring motor stator ( 13 ) via a motor housing ( 27 ) and the stationary outer ring of the rolling bearing ( 11 ) with the drive stand ( 18 ) is firmly connected. Rolling mill according to one of the preceding claims, characterized in that the ring motor stator ( 13 ) consists of several segments. Rolling mill according to one of the preceding claims, characterized in that the ring motor rotor ( 14 ) consists of several segments. Rolling mill according to one of the preceding claims, characterized in that the ring motor ( 12 ) by means of a coolant jacket ( 15 ) passed coolant is cooled. Rolling mill according to one of the preceding claims, characterized in that the ring motor ( 12 ) via a cooling air supply ( 24 ) is cooled with air. Rolling mill according to one of the preceding claims, characterized in that the shaft or the hollow shaft ( 17 ) or the ring motor rotor ( 14 ) with a fan wheel ( 16 ) is designed for cooling air circulation. Rolling mill according to one of the preceding claims, characterized in that the rolling bearing ( 11 ) is designed as a four-point bearing. Rolling mill according to one of the preceding claims, characterized in that the outer circumference of the shaft or hollow shaft ( 17 ) in the area of the ring motor ( 12 ) is cylindrical.