JP2810951B2 - Stirring mill - Google Patents

Description

Description: TECHNICAL FIELD [0001] The present invention comprises a grinding vessel and a stirring rotor provided concentrically with and rotatable therein, and the stirring rotor is provided with a rotor shaft. Is provided at the lower end of the agitator, the rotor axis of the agitation rotor is vertical, a rotationally symmetrical pulverization chamber is provided between the pulverization vessel and the agitation rotor, and the pulverization chamber includes a pulverization body circulating in the pulverization vessel, Is provided with an inlet separator and an outlet separator, which pass the pulverized substance but do not pass the pulverized body, through which the pulverized substance enters the pulverizing chamber, the pulverized substance is discharged from the outlet separator, and the pulverizing chamber is at least The invention relates to an agitating mill having one pump section in which the pulverizing bodies can be driven in the direction of pulverizing body circulation by the centrifugal force acting on them.

[Conventional technology]

In the case of such stirred mills in which the crushed material circulates inside, the crushed material is guided in circulation in the crushing vessel and does not leave the crushing vessel. The milled material is generally in the form of a suspension and is introduced into the milling vessel from an inlet separator and flows substantially axially through the milling vessel during the stirring or milling process and the outlet is separated at the other end of the milling vessel. Get out of the device. This internal circulation of the grinding bodies serves to distribute the grinding bodies as uniformly as possible in the grinding vessel.

In the case of the stirring mill known from DE-A 28 11 899, a bell-shaped rotor with an annular cone is provided. The walls of the rotor, which together with the surrounding stator walls define the grinding chamber, are relatively inclined. Thereby, the kinetic energy in the circulation direction applied to the pulverized body by the generated centrifugal force is extremely small as a whole. Due to the relatively narrow high grinding chamber section which is located radially inward, the grinding body tends to adhere to the inner wall of the rotor under the influence of centrifugal force. In addition, a centrifugal passage is provided which is arranged at a relatively large angle with respect to the horizontal. In this centrifugal passage, the centrifugal force drives the crushed body in the direction of circulation. However, the effect of the centrifugal force is weak since the grinding chamber is arranged at a very steep angle to the horizontal.
Thus, the braking action is relatively large and the pumping power remains small.

[Problems to be solved by the invention]

It is an object of the present invention to provide a stirrer of the type mentioned at the outset, in which the driving or pumping force acting on the pulverizing body is significantly increased, in particular the braking effect occurring in the axial movement range of the pulverizing body is minimized. Is to provide a mill.

[Means for Solving the Problems and Effects of the Invention]

The problem is that the stirring rotor is formed in a disk shape, the grinding container is formed in a hollow disk shape, and the stirring rotor and the grinding container are arranged at an angle of 90 ° with respect to the rotor axis. Above the rotor, there is provided a pump section extending straight from the radially inner side to the outer side in the direction of circulation of the pulverized body. After the crushed body accelerated radially outward by the pump section passes through the circulation section guided around the outer periphery of the disk-shaped stirring rotor, the crushed section passes through the sedation section and returns to the radius. The crushed material is further circulated through a circulation section provided coaxially to the rotor axis at the center of the stirring rotor, in which the crushed body is crushed over a predetermined axial distance. Room It is solved by being returned from the side half to the upper half. As a result, the centrifugal force generated acts almost exclusively in the direction of circulation of the pulverized body, thereby acting as a driving or pumping force. By forming the stirring rotor or the crushing vessel into a disk shape and a hollow disk shape, the axial length of the circulation section connecting the pump section and the calming section is shortened, and the braking action applied to the crushed body is extremely small. Since the movement of the pulverized body is performed substantially in the direction perpendicular to the gravity, the effect of gravity on the movement and distribution of the pulverized body is small.

According to the configuration of the second aspect, the resistance when the crushed body moves from the pump section to the sedation section via the short circulation section in the axial direction is small.

By means of claims 3 and 4, a forced acceleration of the grinding bodies is achieved and a forced transport of the grinding bodies in the radial direction in connection with the resulting centrifugal force is achieved.

According to the features of claim 5, the radial acceleration force applied to the grinding body results in a radial movement which takes place completely radially.

The radially inward movement of the grind in the calming zone is ensured by the flow of the grind material flowing inward from the radial outside and the centrifugal force reduced by the favorable contact of the grind with the lower wall of the grinding vessel. Nevertheless, the movement of the grinding body from the radially outer to the inner side in the sedation zone is assisted by means according to claim 6 or 7.

The pulverization of the pulverized substance is further improved by the arrangement of the bumps according to the eighth aspect.

The circumferential acceleration of the grinding body is improved by the rib according to claim 9.

According to the structure of claim 10 or 11, a hollow disk-shaped crushing container and a disk-shaped stirring rotor can be easily manufactured and assembled. This construction is also expedient for maintenance or repair.

The relative size of the pump section and the sedation section is defined in claim 12.
It can be optimally adjusted by the adjusting device described in Nos.

In the case of the stirring mill according to the invention, an embodiment according to claim 15 is provided in order to be able to change the volume of the grinding chamber and thus the density of the compact in the grinding chamber. Thereby, in particular, both end faces of the disk-shaped stirring mill structure are used for disposing the adjusting device and the pulverizing chamber volume changing device.

The outlet separating device is preferably arranged according to claim 16. In this case, it is expedient if the pulverized substance discharge pipe connected to the outlet separator extends through the center of the pressure piston unit.

In an embodiment according to claim 17, the outlet separating device is a central outlet separating sieve provided at a distance below the stirring rotor, and before this outlet separating sieve, the pulverized material stream passes through the outlet separating sieve. It is separated into a partial stream which is discharged through and separated from the grinding body and a partial stream which is returned together with the grinding body through the inner circulation section to the pump section.

〔Example〕

Next, the present invention will be exemplarily described with reference to the drawings. The figure shows a longitudinal section of a stirring mill according to the invention. This stirring mill is provided with a grinding container slidable in the axial direction and a pressure piston unit for changing the volume of the grinding chamber. An adjusting device is attached to the grinding container.

In the figure, a stirring mill according to the present invention includes a rotationally symmetric hollow disk-shaped crushing vessel 13. The grinding vessel is arranged horizontally and the central axis AA is vertical. The hollow disk-shaped crushing container 13 has an upper half and a lower half. The two halves are assembled in the axial direction while forming a separation seam 53 in the horizontal center plane of the hollow disk-shaped crushing container 13, and are fixed to each other. In the crushing container 13, a disk-shaped stirring rotor 12 is provided concentrically with the crushing container. The stirring rotor includes a rotor disk 37 and a rotor shaft 11 rotatably supported by a fixed rotating bearing 17. In this case, the rotation axis coincides with the central axis AA.
The stirring rotor 12 and the crushing container 13 are relatively measured and arranged as follows. That is, between the rotor disk 37 and the wall 35 of the crushing vessel, a horizontal hollow chamber extending linearly in the radial direction and forming the upper pump section 15a, Sedation section 15 extending linearly in the direction
The dimensions are relatively measured and arranged such that a horizontal cavity forming b is formed. Both hollow chambers are rotor disk 37
Are connected to each other by a hollow chamber forming a circulation section 15c. Sections 15a, 15b, 15c are together
To form In this crushing chamber, a crushed body 18 schematically shown is stored.

The inner circulation section 22 formed by a central return passage 44 arranged concentrically with respect to the rotation axis AA is a rotor disc.
37 are provided inside in the radial direction. This circulation section closes the radially inner side of the pulverized body circulation orbit provided in the vertical radial plane, the lower side opens to the calming section 15b of the pulverization chamber 15 provided below the stirring rotor 12, and the upper side opens. It is in contact with the radial centrifugal passage 21 provided in the rotor disk 37 at the height position of the pump section 15a. This centrifugal passage opens radially outward at the radially inner end of the pump section 15a. The circulation section has a relatively short axial length. This is because the circulation section extends only over a distance that is substantially longer than the thickness of the rotor 37.

The grinding container 13 has an inlet passage 14 extending in the radial direction above the grinding chamber 15. This inlet passage opens radially inward into an inlet separator 33 consisting of two separating rings. Further, an outlet separating device in the form of the outlet separating sieve 20 is provided at a distance below the rotating disk 37. When the stirring rotor 12 rotates, the pulverized material supplied from the inlet passage 14 is pumped radially outward from the inlet separator 33 into a pump section.
It flows into the circulation section 15c and the circulation section 15c, and flows radially inward through the sedation section 15b to the outlet separation screen 20. A product outlet 19 of a pulverized substance discharge pipe 39 is provided below the outlet separation sieve, and the pulverized substance enters the pulverized substance discharge pipe. On the way from the inlet separator 33 to the outlet separation sieve 20, the pulverized material is
It is pulverized by a pulverizing body 18 in 15.

The grinding body 18, which is driven by the disk-shaped stirring rotor 12 circulates in the grinding chamber 15 and the inner circulation section 22. The crushed body is driven radially outward by centrifugal force generated in the centrifugal passage 21 and the pump section 15a connected to the radial outside of the centrifugal passage based on the rotation of the stirring rotor 12, and the circulating section 15c and the calming section 15b are driven. Through the circulation section 22, the pulverized material again reaches the centrifugal passage 21 and the pump section 15a from the inside in the radial direction at the upper end of the circulation section 22. Thereby, circulation of the pulverized body is performed. The circulation of the crushed material is performed in the same direction as the movement of the crushed material from the inlet separation device 33 to the outlet separation sieve 20. Before the outlet separation sieve 20, the mixed flow of the pulverized substance and the pulverized body coming from the outside in the radial direction is divided. That is, the pulverized substance reaches the pulverized substance discharge pipe 39 downward through the outlet separation sieve 20, while the pulverized body 18 enters the circulation section 22 with the other part of the pulverized substance flow upward.

The coaxial return passage 44, which forms the circulation section 22, has a cross section that extends downward in the axial direction in order to improve the inflow of the grinding material and the grinding body 18.

The centrifugal passage 21 is particularly defined only by the rotor wall,
The radially inner side is connected to the central return passage 44, and the radially outer side is connected to the pump section 15a. The centrifugal passage 21 forms a kind of cell wheel (star-shaped feeder).
The crushed body is entrained in the rotation direction in the cell chamber of the cell wheel, and is subsequently pushed radially outward into the pump section 15a of the crushing chamber 15 by the centrifugal force generated at that time.

The centrifugal passage 21 has cell walls extending substantially in the axial and radial directions. This cell wall allows the central return passage
In any case, the crushed material entering the centrifugal passage from 44
It is taken in the rotation direction. The cross section of the centrifugal passage 21 may be round or rectangular.

Since the stirring rotor 12 is formed in a disk shape and the crushing container 13 is formed as a hollow disk-shaped main body, the crushing chamber 15 is formed.
The upper pump section 15a is at an angle of 90 ° to the rotor axis AA and extends linearly in the vertical radial section from the radially inner side to the outer side in the direction of circulation of the pulverized body. In the pump section 15a, the crushed body 18 centrifugally accelerated radially outward.
After the pumping section 15a and the circulation section 15c of the pulverizing chamber 15, the calming section 15b is again guided radially inward by the pulverized material flow.

The stirring rotor 12 has a rounded outer peripheral area, like the inner wall 35 of the crushing vessel 13, so that the pump section 15a is replaced with the
The vertical radial portion of the circulation section 15c of the crushing chamber 15 connected to the pipe extends in a curved manner.

On the inner wall 35 of the stirring rotor 12 and / or the crushing vessel 13,
A bump (not shown) can be provided. Further, it is advantageous to provide a radially outward rib on the stirring rotor 12 at the extension of the centrifugal passage 21. This rib defines a part of the pump section 15a extending the centrifugal passage 21.

Both the stirring rotor 12 and the crushing container 13 are formed in two parts. The rotor disk 37 is a core disk having a spiral upper cooling passage 36 and a spirally arranged lower cooling passage 34.
It consists of 55. The core disk 55 is surrounded by a hollow sheath 56 for receiving it. The sheath preferably consists of two halves divided in a central plane. The two halves are separated seams extending circumferentially
They are hermetically connected to each other along 54.

The crushing container 13 includes a substantially disk-shaped core portion 57 and a sheath portion 58 having a spiral cooling passage 41. The two parts 58, 57 are divided into two halves along their horizontal center plane, and the two halves are assembled together by a circumferentially extending separating seam 53.

Particularly, both halves of the rotor disk 37 made of ceramics or the crushing container 13 are assembled by tightening only. The clamping disk 59 having a central opening corresponding to the return passage 44 is pressed against the rotor disk 37 from below the center by means not shown, so that the rotor disk 37 rotates together with the clamping disk. .

A cooling water pipe 24 is provided inside the hollow rotor shaft 11. The outer diameter of the cooling water pipe is smaller than the inner diameter of the hollow rotor shaft 11. Therefore, the cooling water is
And into the annular chamber 25 between this cooling water pipe and the inner wall of the rotor shaft 11.

In the case of this embodiment, the cooling water is supplied to the rotor shaft 11 and the cooling water pipe.
The cooling water pipe 24 is supplied from an annular chamber 25 formed between
Is discharged again. The annular chamber 25 is formed by a horizontal hole 26 extending in the radial direction and a vertical hole
Is connected to a cooling passage 36 in the inside.

The cooling passage 36 spirally extends from the inside to the outside at one end face of the rotor disc 37, in this case, the left end face, and opens to the connection chamber 40 in the outer peripheral area of the rotor disc 37. This connection chamber guides the cooling water to a cooling passage 34 spirally extending from the outside to the inside on the lower end face of the rotor disk 37. The cooling passage 34 opens into the radial passage 42 and again opens into the cooling water pipe 24 via the longitudinal passage 46 and another radial transverse passage 60.

Thus, a long cooling water passage passes through the inside of the rotor disk 37. A predetermined flow condition occurs in the cooling water passage.

Crushed body 18 is pump section 15a, circulation section 15c, sedation section 15
b, through the circulation section 22, and the centrifugal passage 21 guided radially outward. In this case, the pump section 15a or the centrifugal passage 21 becomes almost half of the entire stroke. Therefore, the crushed body
The pump energy transmitted to 18 is further increased when the rotor surface formed by the rotor disk 37 forms an angle of 90 ° with the rotor axis AA. In addition, the remaining sections
At 15b, 15c, 22 the braking action is reduced to a minimum.
A driving component is generated not only by the centrifugal passage 21 but also by the crushing body 18 contacting the upper surface of the rotor disk 37 by gravity. On the other hand, in the sedation section 15b, the driving component becomes small. Because gravity is a crushing vessel
This is because the crushed body 18 is pulled downward so as to come into contact with the stationary inner wall 35 of the thirteen.

In the figure, the rotary bearing 17 for the rotor shaft 11 is fixed on the upper side, and the grinding container 13 is provided slidably in the axial direction by the adjusting device 23. The adjusting device comprises a stationary flange-shaped support plate 29 integral with the rotary bearing 17.
This support plate has an adjusting spindle 30 mounted on it so as to be non-slidable in the axial direction. Each of the adjusting spindles engages a curved member 32 provided on the grinding container 13 and having an internal thread.

Crushing vessel for stationary stirring rotor 12
To adjust 13 axially, the adjusting spindles 30 can be connected to one another, for example, in a manner similar to that known in the case of bar adjusters for sheet presses.

On the lower end surface of the crushing container 13 on the opposite side of the rotary bearing 17,
A pressure piston unit 28 for changing the density of the pulverized body in the pulverization chamber 15 is provided.

The lower area of the crushing container 13 is formed as a cylinder 47. In this cylinder, a sealed piston 38 having a vertical central axis is arranged in a height-adjustable manner to form the pressure piston unit 28. The lower surface of the piston 38 is flat, while the upper surface 48 is formed so that it rises, in particular laterally. The cylinder 47 is preferably a special structural unit that can be fixedly connected to the original grinding container 13 via a flange 49.

The piston 38 has an opening for the product outlet 19 in the center.
This opening is formed by the upper end of the inner cross section of the pulverized substance discharge pipe 39. The pulverized substance discharge pipe is fixedly mounted in the corresponding hole 50 of the piston, and extends away from the stirring rotor 12 along the rotor axis AA.

The pulverized substance discharge pipe 39 extends slidably and in a sealed manner through the bottom 43 of another cylinder 47, and the lower side is open to the auxiliary piston 51. This auxiliary piston is guided in another cylinder 45 fixed to the bottom 43. Piston 3
8, tube 39 and other auxiliary pistons 51 form a structural unit. The pulverized material is discharged outside through the pipe 39. The ground material forms the outer separating device, piston 38
Through the outlet separation sieve 20 provided on the upper side.

Due to the change in the pressure in the cylinder 47, the piston 38 can move up and down. Thereby, the volume of the crushing chamber 15 can be selectively enlarged or reduced. This is crushing room 15
Allows the desired change in the density of the crushed body within.

The rounded shape of the outer circumference of the rotor disc 37 and the grinding vessel wall 35 makes it possible to produce these parts in a stress-free state, in particular from ceramic materials. In this case, it is furthermore desirable to use a wear-resistant material for the component, for example a hard metal.

In the case of the present embodiment, the inlet separator 33 is provided on the upper side, and the outlet separator 20 is provided on the lower side in the range of the pressure piston unit 28. Can be arranged. The pressure piston unit can be provided, for example, in connection with an S-shaped inlet separating device.

[Brief description of the drawings]

The figure shows a longitudinal section of a stirring mill according to the invention. 11 ... rotor shaft, 12 ... stirring rotor, 13 ... grinding container,
15 …… Crushing room, 15a …… Pump section, 15b …… Sedation section,
15c circulating section, 18 crushed body, 20 outlet separator, 21 centrifugal passage, 22 circulating section, 23 adjusting device, 28 pressure piston unit, 29 support plate, 30…
... Adjustment spindle, 31 ... Adjustment screw, 32 ... Female thread part, 33 ... Inlet separation device, 55 ... Rotor boss, AA ... Rotor axis,

Claims (17)

(57) [Claims] A crushing vessel (13) and a stirring rotor (12) concentrically and rotatably provided therein, the stirring rotor being provided at a lower end of a rotor shaft (11). The rotation axis (AA) of the stirring rotor is vertical, a rotationally symmetrical grinding chamber (15) is provided between the grinding vessel and the stirring rotor, and the grinding chamber circulates through the grinding vessel (13). (18), wherein the crushing chamber is provided with an inlet separator (33) and an outlet separator (20) through which the crushed material passes but does not pass through the crushed body (18). (15), the pulverized material is discharged from the outlet separation device, the pulverization chamber has at least one pump section (15a),
In a stirring mill in which the crushed body (18) can be driven in the circulating direction of the crushed body by the centrifugal force acting on the crushed body in the pump section, the stirring rotor (12) is formed in a disk shape, and the crushing vessel (13) is formed. It is formed in the shape of a hollow disk, and the stirring rotor and the crushing vessel are arranged at an angle of 90 ° with respect to the rotor axis (AA). A pump section (15a) extending straight in the circulation direction of the crushed body (18) is provided, and when the stirring rotor (12) rotates, the crushed body moves radially outward in this pump section, and A sedation section (15b) is provided below, and a circulating section in which the pulverized body (18) accelerated radially outward by the pump section (15a) is guided around the outer periphery of the disk-shaped stirring rotor (12). (15c),
It is again guided radially inward through the calming section, and the crushed material further circulates through a circulation section (22) provided coaxially with the rotor axis (AA) at the center of the stirring rotor (12), A stirring mill wherein the crushed body is returned from the lower half (15b) to the upper half (15a) of the crushing chamber (15) over a predetermined axial distance in the circulation section (22). 2. The agitation according to claim 1, wherein a radial section of the circulation section (15c) connecting the pump section (15a) and the sedation section (15b) of the crushing chamber (15) is rounded. mill. 3. A centrifugal passage (21) is provided between a radially inner circulation section (22) and a pump section (15a), the centrifugal passage including a cell wall extending substantially in the axial and radial directions. The stirring mill according to claim 1 or 2, wherein 4. A stirring mill according to claim 3, wherein the cross section of the centrifugal passage (21) is circular or rectangular. 5. The at least substantially radial centrifugal passage (21) in the rotor boss (55) is aligned with the adjacent pump section (15a) of the grinding chamber (15). Item 5. A stirring mill according to item 3 or 4. 6. A pump section (1) in which a rotor surface and a stator surface defining a crushing chamber (15) are within a calming section (15b).
6. Stirring mill according to any one of claims 1 to 5, characterized in that it has a greater mutual spacing than 5a). 7. A stirring rotor (12) near a sedation section (15b).
The agitating mill according to any one of claims 1 to 5, wherein a stator plate for shielding the sedation section (15b) from the rotor surface is provided at a small distance on the side of. 8. The stirring mill according to claim 1, wherein a bump is provided on an inner surface of the stirring rotor (12) and / or the crushing vessel (13). 9. A radially outwardly directed rib is provided on the agitator rotor (12) at the extension of the centrifugal passage (21), the rib being part of the pump section (15a) extending the respective centrifugal passage (21). The stirring mill according to any one of claims 4 to 8, wherein 10. The stirring mill according to claim 1, wherein the stirring rotor (12) and / or the crushing vessel (13) are formed biaxially. 11. Stirring mill according to claim 10, characterized in that the grinding vessel (13) and / or the stirring rotor (12) consist of two halves divided in a central plane. 12. One end face of the crushing vessel (13) has an axial relative position between the crushing vessel (13) and the stirring rotor (12), and thus a relative volume between the pump section (15a) and the calming section (15b). Stirring mill according to any of the preceding claims, characterized in that a regulating device (23) is provided. 13. A stirring mill according to claim 12, characterized in that the grinding vessel (13) is arranged axially adjustable and the stirring rotor (12) is arranged fixed in the axial direction. 14. An adjustable spindle (30) mounted on a support so as to be non-slidable in the axial direction, comprising a flange-shaped support plate (29) on which an adjusting device (23) is fixed. Rotating bearing (17) with plate (29) fixed to rotor shaft (11)
And an adjusting screw (31) provided at the end of the adjusting spindle (30) is provided on the grinding container (13) and is engaged with the screw part (32). 14. The stirring mill according to claim 13. 15. A grinding container (1) on the opposite side of the adjusting device (23).
The stirring mill according to any one of claims 12 to 14, wherein a pressure piston unit (28) for changing the volume of the pulverizing chamber is provided on the end face of (3). 16. The stirring mill according to claim 15, wherein the outlet separation device (20) is provided in the area of the pressure piston unit (28). 17. An apparatus according to claim 1, wherein the outlet separation device is an outlet separation sieve (20) provided centrally at a distance below the stirring rotor (12). A stirring mill as described.