JP3281037B2 - Scavenging roller mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a scavenging roller mill as defined in the preamble of claim 1.

[0002]

2. Description of the Related Art Such a scavenging roller mill is known from DE 39 21 986 (see FIG. 1).
This roller mill is basically a lower roller mill 200
And an upper integrated shifter 11. The crushed material is crushed between the rotating crushing pan 3 and the crushing roll 9 elastically pressed against the crushing pan 3. The air flowing in through the supply duct 6 is shifted by the shifter 11.
Send the ground material mixture to The crushed particles larger than the specified size pass through the vortex sink 8 and return to the crushing pan 3. The fine particles exit the shifter 11 through the fine particle outlet 15. The pre-compression device 10, in particular, can be arranged functionally upstream of each grinding roll and is pressed by its own weight alone and by any spring damping device against a grinding bed formed of the material to be ground. By pre-compression roll,
Significant efficiencies can be achieved in terms of throughput and scavenging roller mill energy requirements. However,
In all cases, it is not possible to control the vibrations of the scavenging roller mill, in particular caused by the slip-adhesion effect on the grinding rolls, and to a lesser extent, a reduction in work efficiency and a possible interruption of work.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a scavenging roller mill having an improved structure which is very easy to repair and maintain and can perform continuous and efficient grinding operations.

[0004]

The object of the invention is to provide a grinding bed made of grinding material to be finely ground, comprising at least one stationary rotary grinding roll, which grinding roll is placed on a rotary grinding pan. At least one of which can be elastically pressed against the crushing roll and which is combined with the crushing roll to make the crushed material supplied to the crushing roll uniform.
Two precompression devices are provided, which can be at least partially driven by frictional gripping with a grinding bed formed of grinding material, or can be pressed against the grinding bed, or A scavenging roller mill (100) which is subjected to both actions, a sensor (67) for detecting the vibration of the scavenging roller mill (100) in the form of a vibration value, and a pre-compression device (2a, 2).
b, 35) and a device (48, 63, 56) for adjusting the gap between the grinding pan (3) and the surface (23);
By setting the gap, the pre-compression device (2
a, 2b, 35) a precompression device (2a,
This is achieved by a scavenging roller mill, characterized in that the rotation speed of 2b) can be adjusted to minimize the vibration value of the scavenging roller mill (100). That is, the scavenging roller mill of the present invention is characterized in that each pre-compression device, in particular, a means capable of adjusting the rotation speed of each pre-compression roll to reduce the vibration of the scavenging roller mill generated in the pulverizing process to the minimum. Has the greatest features.

[0005]

These vibrations are mainly caused by the sliding-adhering action on the crushing roll, the reduction or elimination of which leads to an increase in the efficiency of the pre-compression roll. Unwanted roller mill vibrations are usually at a minimum when the compression of the grinding bed by the pre-compression roll does not result in the grinding-roll sliding-adhering action. To adjust for optimal grinding operation, the vibration intensity is measured at a representative location on the roller mill, and the speed of the pre-compression roll is adjusted to minimize the detected vibration intensity. Preferably, the vibration intensity is measured in the form of the effective vibration speed (mm / s) defined by VDI 2056. The optimum operating speed of the pre-compression roll is obtained when the measured effective vibration speed is at a minimum.

Advantageously, the optimization of the precompression roll speed is effected by adjusting the gap between the generating line of the pressing surface of the precompression roll and the grinding surface.
Means may be provided for continuous adjustment of the size and thus of the pre-compression roll speed.

[0007] For example, the precompression device may be constituted by a lifting device of any type of mechanical type, pneumatic type and hydraulic type. For the aforementioned adjustment purposes, preferably each precompression roll is provided on a supporting pivoting lever, on which a controllable pivoting mechanism acts.

In order to obtain an optimum gap setting value, a crushing pan is provided with an all-around baffle edge or a damming edge (hereinafter referred to as a "baffle edge"), and the height thereof is set to about 0.1 of the diameter of the crushing roll. It is better to be up to 0.2 times. Normal,
Starting from a grinding bed half the height of the baffle edge, the optimum operating speed of this particular precompression roll is determined.

Preferably, the pre-compression roll and the gap setting device are combined into a single module, which is detachably connected to the roller mill casing, and then, if necessary, integrated with the scavenging roller mill. Can be incorporated.

[0010] Advantageously, said module is pivotally mounted on a roller mill casing so that the pre-compacting roll can be pivoted between an operating position above the grinding pan and a standby position outside the roller mill casing.

It is preferable that the distance between the central longitudinal axis of the roller mill and the rotational axis of the crushing roll or the pre-compression roll at the standby position rotated in the vertical direction is set to be substantially the same. A lifting unit located above the rolls may be provided on the crane travel path defined for both roll types so as to draw a circle around the center of the roller mill. Suitably, the scavenging roller mill casing has a dustproof structure near the module of the precompression roll. Alternatively, a pre-compression sliding shoe may be used as the pre-compression device instead of the pre-compression roll. This sliding shoe increases or decreases the contact pressure applied to the crushed material, and changes the gap between the sliding shoe and the crushing pan so that the vibration of the roller mill can be almost removed. Is set to the minimum value of

Further suitable and advantageous devices can be disclosed from the claims and the following description with reference to the drawings.

An essential advantage of the present invention is that it minimizes the vibration of the scavenging roller mill and ensures operation with minimal energy and consequently minimal failure rate. The modular pre-compression roll unit of the present invention can also be installed with different roller mill sizes.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to the accompanying drawings while considering the basic structure of a scavenging roller mill 200 shown in FIG.

FIG. 2 shows a scavenging roller mill 1 according to the present invention.
FIG. 4 is a plan view of a grinding pan 3 of No. 00; The crushing pan 3 is rotatably installed, and its upper surface forms a crushing surface 23.
The two facing grinding or working rolls 1a, 1b and the two facing precompression rolls 2a, 2b are rotated by friction gripping with the grinding material near the radially outer grinding surface 23. Grinding and pre-compression rolls 1a, 1b,
2a and 2b are arranged alternately. The dimensions of the roll and the arrangement of the other components are clearly described in DE 39 21 986.

The details of this embodiment of the scavenging roller mill 100 can be seen in FIG. FIG. 3 shows the pre-compression roll 2a and the crushing roll 1a adjacent thereto along the section taken along the line AA of FIG. The crushing pan 3 is driven to rotate about the axis 28 by the driving device 4. The grinding pan 3 includes a grinding surface 23 and a central conical portion 40. The grinding pan 3 is attached to the base 41 by a drive 4 and an upper casing part 42 as part of a roller mill casing and a casing of an air duct 43 in the lower region.

The crushing roll 1a is articulated by a swing lever 44 and a rotation lever 45 to a hydraulic cylinder device 46, which is connected to the base 41 by a bearing and a bearing block 47. It is. The hydraulic cylinder device 46 is used to elastically press the grinding roll 1a against the grinding surface 23.

The pre-compression roll 2a is mounted so as to rotate with respect to the swing lever 48, and is suspended on the swing lever 48 so as to be able to vibrate. The swing lever 48 is mounted on a bearing lever 50 by a shaft 49 near its upper end, and the bearing lever 50 is pivotally connected to a bearing block 52 by a shaft 51. The bearing block 52 includes the support 5
It is fixed to the base 41 by 3 and a post 54.

The swing lever 48 has a projecting support area 55.
And this support area 55 engages a mill casing fixed stop 56. This stop 56 determines the maximum sinking depth of the pre-compression roll 2a with respect to the grinding surface 23. Stop 56 is located in the roller mill casing.

A support frame 80 is also provided, which forms a part of the casing wall together with the upper wall portion 57 and the lower wall portion 58 as a casing cover. The upper and lower wall portions 57, 58 are in tight engagement with the roller mill casing 42. In order for the swing lever 48 to pass in a dustproof state,
An arc segment 60 is provided, which is intimately joined to the casing segment 61 of the wall portion 57. The shape of the segment 60 is “pie portion
(tart portion) ".

An extension 62 at the end of the pivot lever 48 is articulated with a hydraulic cylinder device 63 which is fixed at its opposite end, ie the upper end, to the wall portion 57. It is connected to the bearing block 64. The hydraulic cylinder device 63 includes a surface of the grinding pan 3 near the grinding surface 23 and a pre-compression roll 2 facing the grinding surface 23.
It forms part of a device for adjusting the gap or gap between the bus 25a (see FIG. 4). For this purpose, the hydraulic cylinder device 63 is controlled by a control mechanism 65. Depending on the size of the gap between the grinding pan 3 and the pre-compression roll 2a, the rotational speed of the pre-compression roll 2a is continuously adjusted with the rotating grinding pan 3 and the grinding material present there as a result of the change in friction gripping. You. A speed counter mechanism 66 for detecting the speed of the pre-compression roll 2a may be provided. The gap is adjusted to minimize the vibration of the roller mill. The vibration pickup sensor 67 for measuring vibration is provided on the roller mill casing 4.
2 is provided.

In order to set an optimum gap, an intermediate gap height (preset value), which will be described later, is used as a reference, and is determined in consideration of the height of the baffle edge 24. The baffle edge 24 is formed over the entire periphery of the outer edge of the grinding pan 3. The height of the baffle edge 24 is approximately 0.1 to 0.2 times the diameter of the crushing roll 1a.

In the presetting phase, the gap height is approximately half of the intermediate gap height, ie the baffle edge height h,
That is, it is set to h / 2 (see FIG. 4). On the basis of the gap height h / 2, the control mechanism 65 operates the hydraulic cylinder device 63 to optimize the gap, that is, the speed of the pre-compression roll 2a. At this time, the speed is checked by the speed counter mechanism 66. can do. The speed of the pre-compression roll 2a is optimized while observing the vibration of the roller mill by the vibration pickup sensor 67. Thereby, the vibration of the roller mill 100 can be minimized by adjusting the gap height, that is, the rotation speed of the pre-compression roll 2a.

The pre-compression roll 2 is
a is a roller mill casing 4 shown by a dashed line from the operating position above the crushing pan 3 shown by a solid line in FIG.
2. It can be pivoted to the outside standby position. To this end, the bearing lever 50 is articulated by a joint 68 to a hydraulic cylinder 69.

A further hydraulic cylinder device 70 is articulated by means of a joint 71 to the outer end of the pivoting lever 44 supporting the grinding roll, ie the work roll 1a, and consequently the grinding roll 1a (1b). ) Can be rotated in the same way. In FIG. 3, the rotation axis of the grinding roll 1 a located outside the casing 42 at the standby position in the vertical direction, which is indicated by a chain line, from the rotation axis 28 of the grinding pan 3 or a scavenging roller mill 100.
Is equal to the interval of the rotation axis of the pre-compression roll 2a at the standby position from the rotation axis 28 of the crushing pan 3. As a result, the roller mill 100
Both roll types can be installed or held by a common lifting device 72 located on the crane track, not shown, above.

FIG. 5 shows another embodiment, and shows a side view of the crushing pan 3. The precompression roll 2a is shown on the left side above the crushing pan 3, and the sliding shoe 35 for precompressing the crushed material upstream of the corresponding crushing roll 1a (FIG. 2) is shown on the right side. . For the sake of simplicity, the grinding rolls 1a, 1b are not shown in FIG.
Like the pre-compression roll 2a, the sliding shoe 35 can be continuously adjusted by a mechanism (not shown) with respect to the gap to the surface of the grinding pan 3, so that the contact with the grinding material passing under the sliding shoe 35 is achieved. The pressure can be adjusted. The sliding shoe 35 may consist of a horizontal pressure plate, which has a substantially arcuate upper transition in the front area where the grinding material is supplied. It is sufficient for the upper transition to have a short, relatively pronounced curvature from the horizontal area to the vertical area in relation to the grinding material.

In the embodiment shown in FIG. 5, the pre-compression roll 2a
Is exactly intersecting the vertical axis of the grinding pan at S1. This intersection S1 is the bread surface 23
It is located in. This arrangement allows the pre-compression roll 2a to perform a substantially pure rolling motion on the crushed material.

[0028]

According to the present invention, it is possible to provide a scavenging roller mill having an improved structure which is very easy to repair and maintain and can perform a continuous and efficient pulverizing operation.

[Brief description of the drawings]

FIG. 1 is a diagram showing a conventional basic scavenging roller mill structure.

FIG. 2 is a plan view showing a grinding pan with two grinding rolls and two pre-compression rolls in a roller mill according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view taken along line AA of FIG. 2 for explaining speed setting of a pre-compression roll module.

FIG. 4 is a schematic view of the pre-compression roll of FIG. 3, illustrating a setting of a gap between the pre-compression roll and a crushing pan.

FIG. 5 is a schematic view showing a sliding shoe as an alternative device to the pre-compression device.

[Explanation of symbols]

 1a, 1b crushing roll 2a, 2b pre-compression roll 3 crushing pan 4 drive device 23 crushing surface 24 baffle edge 40 central conical portion 41 base 42 upper casing portion 43 air duct 44 oscillating lever 45 rotating lever 46 hydraulic cylinder device 47 bearing block 48 oscillating lever 49 shaft 50 bearing lever 51 shaft 52 bearing block 53 support 54 post 56 stop 60 arc-shaped segment 61 casing segment 62 extension 63 hydraulic cylinder device 64 bearing block 66 speed counter mechanism 67 vibration pickup Sensor 68 Baffle rim 69 Hydraulic cylinder 70 Hydraulic cylinder device 71 Joint 72 Lifting device 100, 200 Scavenging roller mill

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-174259 (JP, A) JP-A-3-213154 (JP, A) JP-A-61-291050 (JP, A) JP-A-60-1985 150849 (JP, A) JP-A-3-232544 (JP, A) JP-A-3-213155 (JP, A) JP-A 62-79544 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B02C 15/00-15/16 B02C 25/00

Claims (11)

(57) [Claims] 1. A method according to claim 1, further comprising the step of: at least one stationary rotary grinding roll, said grinding roll being elastically pressed against a grinding bed formed of the grinding material to be milled, which is placed on a rotary grinding pan. can, also, the combination and the grinding rolls, at least one precompression device precompression rows to equalize the ground material supplied to the grinding rolls
It is provided with is configured as Le, the pre-compression apparatus, small
The even without part, drive by at least the friction of the friction and contact pressure between the grinding bed formed by grinding material
A scavenging Rorami le that will be dynamic, and cell <br/> emissions Sa for detecting the vibration of the scavenging Rorami le in the form of vibration values, based on the vibration value detected by said sensor,
Gap between the pre-compression roll and the surface of the grinding pan
Adjustment and at least partially driven by friction
Adjusting the rotation speed of the pre-compression roll
Scavenging roller mill having a device for the vibration value of the expression roller mill to minimize the. 2. A scavenging roller mill according to claim 1, wherein the precompression device is constituted by a precompression roll (2a, 2b) or a sliding shoe (35) or both. . 3. The scavenging roller mill according to claim 1, wherein the gap setting device is capable of continuously setting the gap. 4. The scavenging roller mill according to claim 1, wherein the apparatus for setting the gap comprises a pre-compression roll (2a, 2).
A scavenging roller mill comprising a swing lever (48) for supporting b) and a controllable device (63) for rotating the swing lever (48). 5. The scavenging roller mill according to claim 1, wherein the grinding pan has a baffle edge on its outer periphery, the height of the baffle edge being reduced. Grinding rolls (1a, 1
A scavenging roller mill, which is approximately equal to 0.1 to 0.2 times the diameter of b). 6. A scavenging roller mill according to claim 5, wherein the device for adjusting the gap between the bus bar (25) of the pre-compression rolls (2a, 2b) and the surface of the grinding pan (3) is provided. A) a scavenging roller mill having a gap preset value of about half the height of the roller mill. 7. The scavenging roller mill according to claim 4, wherein the precompression rolls (2a, 2b), the swaying lever (48) associated therewith and the swaying lever (48). (63) is configured as an integral module, which can be installed as a unit in a support frame (80), which supports a scavenging roller mill casing A scavenging roller mill comprising a sealing mechanism (57, 58) for (42). 8. The scavenging roller mill according to claim 7, wherein the module is pivotally mounted and the precompression rolls (2a, 2a).
b) is located above the crushing pan (3), and the pre-compression rolls (2a, 2b) are scavenging roller mills (100).
The support frame (80) is removably connected to the scavenging roller mill casing (42). Scavenging roller mill. 9. Scavenging roller mill according to claim 8, wherein the grinding rolls (1a, 1b) are in an operating position above the grinding pan (3) and outside the casing (42) of the scavenging roller mill (100). The pre-compression rolls (2a, 2b) can be rotated between the standby position, and the distance between the grinding rolls (1a, 1b) at the standby position and the central longitudinal axis (28) of the scavenging roller mill (100) is at the standby position. A scavenging roller mill characterized by having a distance equal to a distance from the central longitudinal axis (28). 10. The scavenging roller mill according to claim 7, wherein the scavenging roller mill casing (42) has an area where the swing lever (48) supporting the pre-compression rolls (2a, 2b) passes through the casing (42). The scavenging roller mill according to claim 1, further comprising a device sealed to a part of the module so that the swing lever (48) can pass in a dustproof manner through the recess in the module portion. 11. A scavenging roller mill according to claim 10, wherein the device for passing the dustproof passage of the swing lever (48) comprises a segment (60) tightly connected to the swing lever (48) and a casing segment (60). 61), wherein the casing segment (61) is in sealing engagement with the outer surface of the segment (60).