JP2588108B2 - Roller rotation speed detector of vertical mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting the number of revolutions of a roller which rotates following a rotary table of a vertical mill.

[0002]

2. Description of the Related Art In a vertical mill, a roller is rotated through a supply material layer following the rotation of a rotary table, and a pressing force is applied to the roller so that the rotary table and the roller bite the material layer. The feed material is pulverized while applying a compressive force and a shear force.

[0003] The roller is rotated about a roller axis via a bearing, and the roller axis is mounted on a roller support.
Around the support shaft, the roller can be tilted, and a roller sandwiches the material layer by the operation of the pressurizing means to press the rotary table. Then, an excessive load is applied when the supply material is crushed.

If the rotation of the roller is not smooth due to an abnormality in the bearing portion or the rotation is stopped, a slip is generated between the roller and the rotary table via the material layer, and the wear of the contact surface is rapidly increased. At the same time, vibrations and the like are generated in the structure of the vertical mill including the roller support system, resulting in overload.

Conventionally, as an apparatus for detecting the number of rotations of a roller of a vertical mill, a test object composed of a plurality of metal pieces or the like is disposed on the side surface of a ring body via a ring body for suppressing the bearing of the roller, and a facing portion of the test object is arranged. Is known in which a detection signal is transmitted to a display outside the apparatus (Japanese Utility Model Laid-Open No. 64-44035).

In this type of roller rotation speed detecting device, the roller rotation speed is detected by using an electric signal between a subject and a proximity detector as a detection signal when the material is exposed to a material pulverizing atmosphere in a vertical mill. Is displayed on an external display.

[0007]

However, in the above-mentioned conventional construction, the bearings of the rollers, the annular body, the subject, the proximity detector, and the like are all exposed to the material pulverizing atmosphere in the vertical mill. Since it is mounted, the detection device may be damaged under severe crushing atmosphere, and when crushing highly reactive material, fragments of the detection device etc. are mixed and crushed However, there is a danger of abnormal ignition or the like, which is not preferable. Further, since the number of mounted subjects is relatively limited, there arises a problem that a change in the rotation speed of the roller cannot be instantaneously detected.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a roller mill in an airtight box in which an airtight atmosphere isolated from a pulverizing atmosphere of a material in a vertical mill is formed. Roller of a vertical mill that directly detects the rotation state and ensures early diagnosis of the rotation state, effectively preventing wear of the contact surface of each crushing element and hindrance to smooth operation of the vertical mill. It is an object of the present invention to provide a rotation speed detection device.

[0009]

According to the present invention, a roller is provided at one end of a roller shaft for rotation by being inserted into the outer periphery of a bearing housing, and at the other end thereof is provided a roller. An airtight box is provided between the end of the bearing box and the mounting seat of the roller support to provide an airtight fluid. A rotation detecting body in which a plurality of slits are arranged on the inner circumference is sandwiched, and a proximity switch having a groove facing the slit of the rotation detecting body is mounted together with the rotation detecting body in an airtight box, and the output of the proximity switch is used. It is characterized in that the number of rotations of the roller is detected.

[0010]

In this manner, the rotation detector and the proximity switch are mounted in an airtight box having an airtight atmosphere separated from the crushing atmosphere of the material in the vertical mill and separated by a magnetic switch and a proximity switch. The rotation state of the roller, that is, the number of rotations, can be directly detected by the detection mechanism using means, and the rotation state and the pulverization state of the vertical mill can be diagnosed in real time. Inhibition of smooth operation of the vertical mill can be effectively prevented.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of a main part showing one embodiment of the present invention, FIG. 2 is a cross-sectional view showing a mounting portion between the rotation detector and a proximity switch, and FIG. 3 is a line III-III in FIG. And FIG. 4 is a circuit diagram of the proximity switch.

1 to 4, reference numeral 10 denotes a rotating roller, reference numeral 12 denotes a roller shaft, reference numeral 13 denotes a bearing, and reference numeral 14 denotes a bearing box. One end of the roller shaft 12 is inserted into and fixed to the outer periphery of the bearing box 14. A bearing housing 14 provided with a rotating roller 10
A bearing 13 is mounted inside.

The other end of the roller shaft 12 has a roller support 1
8, and can be tilted around its support shaft 22. By the operation of the pressing means 20, the roller 10 sandwiches the material layer and presses the rotary table 24. The rotary table 24 is rotated following the rotation of the rotary table 24. According to the rotation of the roller 10, the bearing box 1
4, the rotation detecting body 26 is integrally rotated via the bearing holding member 15 and the holding member 46. 19 is a roller support 1
8 is a mounting seat member mounted on a side portion of FIG.

A bearing holding member 15 is fastened to the end of the bearing housing 14 to support the axial force of the bearing 13, and a seal ring 38 is inserted into the gap between the bearing housing 14 and the roller shaft 12. Sealed. An airtight box 32 is provided between an end of the bearing box 14, more specifically, between the outer side of the bearing holding member 15 and the mounting seat 19 of the roller support 18.

The detection mechanism 16 includes a rotation detector 26 and a proximity switch 28, and is mounted in an airtight box 32. A rotation detector 26 is inserted into the end of the bearing retainer 15 by a retainer 46. The rotation detector 26 is made of an aluminum thin disk, and its inner peripheral portion has an irregular shape pointing in the radial direction. A large number of slit portions 27, for example, 6
It is regularly and finely arranged at equal intervals of 0 or more. The slit 27 of the rotation detecting plate 26 is a proximity switch 2
8 and are opposed to each other. Reference numeral 34 denotes a mount for the proximity switch 28, and the cover 36 is
2 is closed. An orifice 40 communicates with the cover 36 and the member 39, and the airtight fluid 4
2. For example, compressed air is sealed in the airtight box 32, and the detection mechanism 16 is configured to obtain a clean airtight atmosphere that is isolated from the crushing atmosphere of the material in the vertical mill. The proximity switch 28 has a magnetic core to form a magnetic circuit, and a magnetic flux is generated in the circuit.

When the rotation detecting member 26 is rotated simultaneously with the rotation of the roller 10 and the slit portion 27 of the rotation detecting member 26 passes through the groove portion 29 of the proximity switch 28, the magnetic flux generated in the groove portion 29 is intermittently changed. It shuts off, and the change in the amount of sensitivity for each slit 27 is input to the oscillation circuit by the built-in detection coil to stabilize the operating frequency by increasing the speed. This output signal is output as a two-position switching signal by the amplification switching circuit. , This digital output signal is
That is, it is input to the counting circuit of the digital tachometer 48,
The count is displayed continuously. The frequency of the voltage induced in the detection coil is the product of the number of rotations per second and the number of slits 27, and is proportional to the number of rotations. ,
The rotation number of the rotation detector 26, that is, the roller 10, can be directly measured. Moreover, since the slits 27 are arranged in a large number of narrow portions, the detection interval can be shortened, and
A change in the number of revolutions of 0 can be measured instantaneously.

The detection mechanism 16 is, as described above, an airtight box 38.
It is installed in a clean airtight atmosphere inside, so that damage and the like can be prevented, and furthermore, it is possible to avoid giving an error in the magnetic response to the rotation detector 26, and to measure the rotation speed under a smooth operation. And the rotation detection system is mounted near the roller shaft 12, so that the rotation operation of the detection mechanism can be smoothly performed without significantly changing the roller structure of the vertical mill. Can be.

[0019]

As described above, according to the present invention,
A roller detector is mounted in an airtight box with an airtight atmosphere isolated from the crushing atmosphere of the material in a vertical mill, and is directly connected to the roller part. The rotation state, that is, the number of rotations, can be directly detected, and the rotation state and the change in the grinding state of the vertical mill can be instantaneously diagnosed in real time, and the wear of the contact surface of each grinding element and the smoothness of the vertical mill can be determined. Obstruction of the operation can be effectively prevented.

Further, the detection mechanism can be mounted without significantly changing the roller structure of the vertical mill. Further, a great effect is exhibited, for example, the life of a vertical mill including a roller can be extended.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a mounting portion between the rotation detector and the proximity switch.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a circuit diagram of the proximity switch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Roller 12 ... Roller shaft 14 ... Bearing box 18 ... Roller support material 19 ... Mounting seat 26 ... Rotation detector 27 ... Slit part 28 ... Proximity switch 29 ... Groove part 32 ... Airtight box 48 ... Digital tachometer

Claims (2)

(57) [Claims] An end of a roller shaft is provided with a roller which is inserted into the outer periphery of a bearing box and rotates, and a roller supporting member is provided at the other end thereof so as to be tiltable. An airtight box for enclosing an airtight fluid is provided between the roller support and the mounting seat, and a rotation detector having a plurality of slits arranged on the inner circumference is sandwiched at the end of the bearing holding member of the bearing box. And a proximity switch having a groove portion facing the slit portion of the rotation detection body is mounted in an airtight box together with the rotation detection body, and the rotation speed of the roller is detected by the output of the proximity switch. Number detection device. 2. A roller for a vertical mill according to claim 1, wherein the proximity switch detects a sensitive amount by blocking a magnetic flux when the rotation detector passes through the groove, and connects to a tachometer. Speed detector.