JP2012045496A - Monitoring apparatus and monitoring method of crushing roller of vertical mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitoring apparatus which can check that a crushing roller does not normally rotate.SOLUTION: A vertical mill 10 includes a body 1 used as a vertical container, a crushing table 14, two or more crushing rollers 2, a plunger 3 and a vibration controlling damper device 4. Coal is charged into the body 1 and is crushed by cooperation of the crushing table 14 and the crushing roller 2. The plunger 3 applies force for crushing coal. The vibration controlling damper device 4 suppresses amplitude of self-excited vibration generated in the crushing roller 2. The monitoring apparatus 9 includes a vibrometer 91 and a monitoring panel 90. The vibrometer 91 measures an amplitude value of the vibration controlling damper device 4. Data of the amplitude value of the vibrometer 91 are input in the monitoring panel 90. It can be determined that the crushing roller 2 does not normally rotate by largely decreasing in the data of amplitude value of the vibrometer 91 when the crushing roller 2 does not normally rotate.

Description

  The present invention relates to a monitoring device and a monitoring method for a grinding roller of a vertical mill. In particular, the present invention relates to a monitoring device and a monitoring method for monitoring the operation of a grinding roller in a vertical mill that pulverizes coal or the like with a grinding roller to produce pulverized coal.

  For example, in a power plant that uses pulverized coal as fuel for a boiler, pulverized coal is produced by crushing massive coal with a crushing roller using a vertical mill. In this vertical mill, a phenomenon is known in which a pulverizing roller for pulverizing coal slides and shakes greatly, and self-excited vibration is generated in the pulverizing roller. For example, the operation switch senses this self-excited vibration, and a situation occurs in which the power generation turbine is stopped.

  In order to solve such a situation, a vertical mill with a damping damper device that suppresses the self-excited vibration of the crushing roller to vibration with a minute amplitude of about 0.1 mm is disclosed (for example, Patent Document 1). reference).

Japanese Patent Laid-Open No. 9-248473

  The vertical mill described above pulverizes coal by entraining coal between a table whose horizontal plane rotates and a pulverizing roller which rotates following the table. However, if the vertical mill is operated for a long time, the crushing roller deteriorates and does not rotate.

  On the other hand, the vertical mill has a crushing roller arranged inside the outer shell covered with a dome, so that the dark interior of the vertical mill is visually checked to see if the crushing roller is rotating normally. There was a problem that it was difficult to confirm.

  If a monitoring device and a monitoring method capable of confirming whether or not the crushing roller is rotating normally can be realized, the maintenance time of the crushing roller can be specified, and it is convenient without operating the vertical mill unnecessarily. The above can be said to be the subject of the present invention.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a monitoring device and a monitoring method for a crushing roller of a vertical mill that can confirm that the crushing roller is not rotating normally. To do.

  The present inventor has found that it is possible to monitor that the crushing roller is not rotating normally by measuring the amplitude of the damping damper device, and based on this, the following new vertical mill Invented a monitoring device and a monitoring method for crushing rollers.

  (1) The vertical mill crushing roller monitoring apparatus according to the present invention includes a cylindrical vertical container in which coal is charged and pulverized coal is produced by pulverizing the coal, and the bottom of the vertical container. A crushing table that is placed on and rotates horizontally with coal placed thereon, a plurality of swinging crushing rollers having roller tires that are rotated by friction transmitted to the crushing table, and the crushing rollers are pressed against the crushing table A plunger for energizing the force of crushing coal interposed between the crushing roller and the crushing table, and an outer wall of the vertical container, and in conjunction with the plunger, the crushing In a vertical mill comprising a vibration damping damper device that suppresses the amplitude of self-excited vibration generated in the roller, the monitoring device monitors the operation of the grinding roller, and measures the amplitude value of the vibration damping damper device Shake It comprises a total, and a monitoring panel which amplitude data is inputted in the vibrometer.

  (2) A vertical mill crushing roller monitoring device according to the present invention includes a cylindrical vertical container in which coal is charged and pulverized coal is produced by pulverizing the coal, and the bottom of the vertical container A crushing table that is placed on and rotates horizontally with coal placed thereon, a plurality of swinging crushing rollers having roller tires that are rotated by friction transmitted to the crushing table, and the crushing rollers are pressed against the crushing table A plunger for energizing the force of crushing coal interposed between the crushing roller and the crushing table, and pulverized coal produced by cooperation of the crushing table and the plurality of crushing rollers. A saddle type comprising: a primary air supply pipe to which primary air blown up above the vertical container is supplied; and a secondary air supply pipe in which pulverized coal blown up to the primary air is blown into secondary air and collected. In the mill A monitoring device for monitoring the operation of the crushing roller, the first pressure gauge for measuring the pressure value of the primary air, the second pressure gauge for measuring the pressure value of the secondary air, and the first pressure gauge. The pressure value data of the second pressure gauge and the pressure value data of the second pressure gauge are input, and the differential pressure data between the pressure value data of the first pressure gauge and the pressure value data of the second pressure gauge is calculated. And a possible monitoring panel.

  (3) A vertical mill grinding roller monitoring device according to the present invention includes a cylindrical vertical container in which coal is introduced and pulverized coal is produced by pulverizing the coal, and the bottom of the vertical container A crushing table that is placed on and rotates horizontally with coal placed thereon, a plurality of swinging crushing rollers having roller tires that are rotated by friction transmitted to the crushing table, and the crushing rollers are pressed against the crushing table Then, in a vertical mill comprising a plunger for energizing a force for crushing coal interposed between the crushing roller and the crushing table, and an electric motor having an output shaft connected to the crushing table, A monitoring device for monitoring the operation of the crushing roller, comprising: an ammeter for measuring a load current value of the electric motor; and a monitoring panel to which load current value data of the ammeter is input.

  (4) The vertical mill crushing roller monitoring method according to the present invention includes a cylindrical vertical container in which coal is introduced and pulverized coal is produced by pulverizing the coal, and the bottom of the vertical container A crushing table that is placed on and rotates horizontally with coal placed thereon, a plurality of swinging crushing rollers having roller tires that are rotated by friction transmitted to the crushing table, and the crushing rollers are pressed against the crushing table A plunger for energizing the force of crushing coal interposed between the crushing roller and the crushing table, and an outer wall of the vertical container, and in conjunction with the plunger, the crushing A method for monitoring a crushing roller of a vertical mill, comprising: a vibration damping damper device that suppresses the amplitude of self-excited vibration generated in the roller; and a vibration meter that measures the amplitude value of the vibration damping damper device. Send from total Based on the amplitude value data, determines the presence or absence of rotation of the grinding rollers.

  (5) The vertical mill grinding roller monitoring method according to the present invention includes a cylindrical vertical container in which coal is charged and pulverized coal is produced by pulverizing the coal, and the bottom of the vertical container. A crushing table that is placed on and rotates horizontally with coal placed thereon, a plurality of swinging crushing rollers having roller tires that are rotated by friction transmitted to the crushing table, and the crushing rollers are pressed against the crushing table A plunger for energizing the force of crushing coal interposed between the crushing roller and the crushing table, and pulverized coal produced by cooperation of the crushing table and the plurality of crushing rollers. A primary air supply pipe to which primary air blown up above the vertical container is supplied; a secondary air supply pipe in which pulverized coal blown up to the primary air is blown into the secondary air and collected; and Measure the pressure value And a second pressure gauge for measuring a pressure value of the secondary air, the method for monitoring a crushing roller of a vertical mill, wherein the pressure value data of the first pressure gauge and the first pressure gauge The differential pressure data with the pressure value data of the two pressure gauges is calculated to determine whether or not the crushing roller is rotating.

  (6) The monitoring method of the crushing roller of the vertical mill according to the present invention includes a cylindrical vertical container in which coal is charged and pulverized coal is produced by pulverizing the coal, and the bottom of the vertical container A crushing table that is placed on and rotates horizontally with coal placed thereon, a plurality of swinging crushing rollers having roller tires that are rotated by friction transmitted to the crushing table, and the crushing rollers are pressed against the crushing table A plunger for energizing a force of crushing coal interposed between the crushing roller and the crushing table, an electric motor having an output shaft connected to the crushing table, and a load current value of the electric motor. A method for monitoring a grinding roller of a vertical mill comprising an ammeter for measuring, wherein the presence or absence of rotation of the grinding roller is determined based on load current value data of the ammeter.

  The vertical mill crushing roller monitoring device according to the present invention includes a vibration meter for measuring the amplitude value of the vibration damping damper device and a monitoring panel to which the amplitude value data of the vibration meter is input. The monitoring device for the crushing roller of the vertical mill according to the present invention can determine that the crushing roller is not rotating normally because the amplitude value data is greatly reduced if the crushing roller is not rotating normally.

  The vertical mill grinding roller monitoring device according to the present invention includes a first pressure gauge for measuring a primary air pressure value, a second pressure gauge for measuring a secondary air pressure value, and a pressure of the first pressure gauge. A monitoring panel capable of calculating differential pressure data between the value data and the pressure value data of the second pressure gauge is provided. According to the vertical mill crushing roller monitoring device of the present invention, if the crushing roller does not rotate normally, the pulverized coal is not manufactured normally, and the differential pressure data becomes large. It can be determined that the roller is not rotating normally.

  Furthermore, the vertical mill crushing roller monitoring device according to the present invention includes an ammeter for measuring the load current value of the electric motor and a monitoring panel to which load current value data of the ammeter is input. According to the vertical mill crushing roller monitoring device of the present invention, if the crushing roller does not rotate normally, the load current value data for rotating the crushing table becomes large, so the crushing roller is rotating normally. It can be determined that there is not.

It is a longitudinal cross-sectional view which shows the structure of the monitoring apparatus with which the vertical mill by one Embodiment of this invention and the vertical mill are equipped. It is a longitudinal cross-sectional view which shows the structure of the vertical mill by the said embodiment. It is a front view which shows the external appearance of the vertical mill by the said embodiment. It is XX arrow sectional drawing of FIG. It is the front view which expanded the crushing roller with which the vertical mill by the said embodiment was equipped, and the damping damper apparatus. It is A arrow directional view of FIG. It is a longitudinal cross-sectional view of the damping damper apparatus with which the vertical mill by the said embodiment is equipped.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
[Configuration of vertical mill]
(Overall configuration of vertical mill)
Initially, the whole structure of the vertical mill by one Embodiment of this invention is demonstrated. FIG. 1 is a vertical cross-sectional view showing a configuration of a vertical mill according to an embodiment of the present invention and a monitoring device provided in the vertical mill. FIG. 2 is a longitudinal sectional view showing the configuration of the vertical mill according to the embodiment.

  FIG. 3 is a front view showing the appearance of the vertical mill according to the embodiment. 4 is a cross-sectional view taken along the line XX of FIG. FIG. 5 is an enlarged front view of the crushing roller and the vibration damper device provided in the vertical mill according to the embodiment. In addition, in FIG.3 and FIG.4, illustration of the damping damper apparatus is abbreviate | omitted.

  Referring to FIGS. 1 to 5, in a vertical mill 10 according to an embodiment of the present invention, a main body 1 serving as a vertical container includes a classification unit 11 and a pulverization unit 12. The classifying unit 11 covers the upper part of the main body 1 in a dome shape. The crushing part 12 surrounds the lower part of the main body 1 with a solid cylindrical outer shell.

  1 to 3, the main body 1 is supported by a leg base 13 installed on the floor surface FL. A disc-shaped crushing table 14 having a rotating horizontal surface is installed below the crushing unit 12. An electric motor 15 and a speed reducer 16 are installed on the floor surface FL. The output shaft of the electric motor 15 is connected to the speed reducer 16. The output shaft of the speed reducer 16 is connected to the crushing table 14. And if the electric motor 15 is driven, the crushing table 14 can be rotated.

  With reference to FIG. 1 or FIG. 2 and FIG. 4 or FIG. 5, three crushing rollers 2 are radially attached to the crushing section 12. The grinding roller 2 supports a rotating shaft 2b on a pipette bracket 2a. A roller tire 2c is rotatably supported at the tip of the rotating shaft 2b. When the crushing table 14 is rotated, the crushing roller 2 is configured so that the rotation of the crushing table 14 is frictionally transmitted to the roller tires 2c. That is, the crushing table 14 and the crushing roller 2 constitute a friction transmission device in which two axes intersect at right angles.

  Referring to FIGS. 2 to 5, the outer shell of the crushing part 12 is partially open. A journal cover 17 covers the opening of the pulverizing unit 12 so that it can be opened and closed. The journal cover 17 supports a rotating shaft 17a that extends in a direction orthogonal to the centrifugal direction of the crushing unit 12. And the base end part of the pipette bracket 2a is connected with the rotating shaft 17a so that rotation is possible. That is, the crushing roller 2 is supported so as to be able to swing in a direction approaching or separating from the crushing table 14.

  Referring to FIG. 2 or FIG. 4 and FIG. 5, the pipette bracket 2a protrudes from the pressing piece 21a. On the other hand, a set of plungers 3 and 3 are attached to the journal cover 17 to press the pressing piece 21a and rotate the pipette bracket 2a in the clockwise direction.

  Referring to FIG. 5, a stop piece 22a is provided on the opposite side of the pressing piece 21a. The stop piece 22a is configured such that the tip of the adjustment bolt 17b abuts, and the clockwise rotation of the pipette bracket 2a is regulated (restricted). The adjustment bolt 17b is configured so that the protruding length of the tip can be adjusted from the outside.

  Referring to FIG. 5, the plunger 3 includes a cylindrical cylinder tube 3a, a plunger rod 3b, and a compression coil spring 3c. The cylinder tube 3 a is attached to the journal cover 17 so as to protrude toward the inside of the pulverization unit 12. The plunger rod 3b is held by the cylinder tube 3a so as to advance and retreat in the axial direction of the cylinder tube 3a. The compression coil spring 3c is housed in the cylinder tube 3a, and the tip of the plunger rod 3b urges the force that presses the pressing piece 21a.

  Referring to FIG. 5, the massive coal interposed between the pulverizing table 14 and the pulverizing roller 2 is crushed (pulverized) while being rotated or rubbed against each other while being urged by the plunger 3. Thereby, pulverized coal cf can be manufactured.

  Referring to FIG. 5, the base end portion of the plunger rod 3 b connects the damping damper device 4. The illustrated damping damper device 4 is configured in the same manner as the damping damper device disclosed in Patent Document 1. And the damping damper apparatus 4 can suppress the self-excited vibration of the crushing roller 2 to vibration of a minute amplitude, and the configuration and operation will be described later.

  Referring to FIG. 5, the journal cover 17 is connected to the outer shell of the crushing part 12 by a hinge shaft 17 c. When the journal cover 17 is opened outward (see the imaginary line in FIG. 1 or 2), it becomes easy to check or maintain the grinding roller 2 and the plunger 3.

  Referring to FIGS. 1 to 3, an annular primary air chamber 121 is formed in a lower part of the pulverizing unit 12 so as to enclose the lower part of the pulverizing table 14. Primary air A1 is supplied to the primary air chamber 121 from the outside through a primary air supply pipe 12d. And primary air A1 is blown in toward the classification | category part 11 from the primary air chamber 121 via the some port 12p arrange | positioned around the crushing table 14. FIG. The primary air chamber 121 communicates with the foreign matter discharge pipe 12f. Further, seal air is ventilated from the seal air supply pipe 12 s to the bearing portion of the crushing table 14.

  Referring to FIGS. 1 to 3, a top of the main body 1 is attached with an inverted frustoconical sealed distributor 1 a. The inside of the distributor 1 a communicates with the classification unit 11 and the pulverization unit 12. Four secondary air supply pipes 11a are attached to the upper surface of the distributor 1a. Further, the secondary air supply pipe 11a is provided with a cut damper 12a for opening and closing the flow path of the secondary air supply pipe 11a from the inside of the distributor 1a.

  Referring to FIGS. 1 to 3, the pulverized coal cf blown up by the primary air A1 is classified by the classification unit 11 and ascends to the distributor 1a. The pulverized coal cf is blown to the secondary air A2, collected in the secondary air supply pipe 11a, and supplied to a boiler (not shown) through the secondary air supply pipe 11a. Generally, the pressure of the secondary air A2 is lower than the pressure of the primary air A1 in the process of passing through the inside of the main body 1.

  Referring to FIG. 1 or FIG. 2, a coal supply pipe 1 b is arranged at the center of the main body 1. The upper end of the coal supply pipe 1b protrudes from the distributor 1a. Further, the lower end of the coal supply pipe 1 b is opened slightly above the crushing roller 2.

  Referring to FIG. 1 or FIG. 2, the coal supply pipe 1b is rotatably attached with a cyclone (rotary classifier) 1c surrounded by an inverted conical reject chute 11c. The cyclone 1c turns the pulverized coal cf that has entered from the lower end via the reject door 12c, and classifies the pulverized coal cf by centrifugal force.

  Referring to FIG. 1 or FIG. 2, pulverized coal cf having a large specific gravity (large particle size) is recovered by the reject chute 11c and pulverized again. On the other hand, the pulverized coal cf having a small specific gravity (small particle size) is distributed in the central portion of the cyclone 1c and is supplied to a boiler (not shown) through the secondary air supply pipe 11a. The classification of pulverized coal cf also depends on the rotational speed of the cyclone 1c.

  Referring to FIGS. 1 to 3, a plurality of vanes 13c are arranged in an annular shape on the upper part of the cyclone 1c. A loop air tube 14c is arranged so as to surround the outer periphery of the classifying unit 11. The compressed air is supplied to the loop air pipe 14c from the outside, and the compressed air is blown onto the vane 13c from a plurality of appropriate positions to rotate the cyclone 1c. By adjusting the rotational speed of the cyclone 1c, pulverized coal cf having a desired particle diameter can be obtained.

  Referring to FIG. 1 or FIG. 2, in the illustrated vertical mill 10, coal is transferred from a bunker (not shown) that stores massive coal and is put into a coal supply pipe 1 b. These lump coals continue to fall (accumulate) into the annular recess of the crushing table 14 after dropping to the center of the crushing table 14. And by the cooperation of the crushing table 14 and the crushing roller 2, the lump coal is pulverized to produce pulverized coal cf.

(Configuration of vibration control damper device)
Next, the configuration of the vibration damping damper device 4 according to the embodiment will be described. 6 is a view taken in the direction of arrow A in FIG. FIG. 7 is a longitudinal cross-sectional view of the vibration damper device provided in the vertical mill according to the embodiment. 6 of this application corresponds to FIG. 3 of Patent Document 1, and FIG. 7 of this application corresponds to FIG. 4 of Patent Document 1.

  Referring to FIGS. 5 to 7, the damping damper device 4 includes a connecting rod 41, a pair of strip-shaped movable plate 4a and fixed plate 4b, and a pair of damping dampers 42 and 42. One end of the connecting rod 41 is connected to the base end of the plunger rod 3b. The other end of the connecting rod 41 is fixed to the center of the movable plate 4a.

  Referring to FIG. 5 or FIG. 6, a reinforcing plate 41a is attached to the movable plate 4a along the longitudinal direction to prevent the movable plate 4a from being deformed. The set of damping dampers 42 and 42 are arranged to face each other with the connecting rod 41 therebetween.

  Referring to FIG. 5, the vibration damper 42 connects the movable plate 4a and the fixed plate 4b so that the movable plate 4a and the fixed plate 4b are relatively close to each other or separated from each other. The fixing plate 4 b fixes the support legs 41 b protruding from the four corners to the ribs of the journal cover 17.

  Referring to FIG. 7, the damping damper 42 is composed of a double bellows pipe having an inner bellows pipe 42a and an outer bellows pipe 42b surrounding the inner bellows pipe 42a. One end side of the outer bellows tube 42b is sealed with a movable flange 42c. The other end side of the outer bellows tube 42b is sealed with a fixing flange 42d. The movable flange 42c is fixed to the movable plate 4a, and the fixed flange 42d is fixed to the fixed plate 4b (see FIG. 5).

  Referring to FIG. 7, a first working fluid chamber 421 is provided between the inner bellows pipe 42a and the outer bellows pipe 42b. On the other hand, a shielding plate 42e is provided inside the inner bellows pipe 42a, and is partitioned into an air chamber 420 and a second working fluid chamber 422. A partition plate 42f is provided inside the outer bellows pipe 42b to form a third working fluid chamber 423 that partitions the first working fluid chamber 421 and the second working fluid chamber 422.

  Referring to FIG. 7, the air chamber 420 communicates with the outside air through a flow hole h1 opened in the movable flange 42c. The first working fluid chamber 421, the second working fluid chamber 422, and the third working fluid chamber 423 are filled with an incompressible fluid (hereinafter abbreviated as fluid) L.

  Referring to FIG. 7, the partition plate 42 f has a flow hole h <b> 2 communicating with the first working fluid chamber 421 and the third working fluid chamber 423, and the second working fluid chamber 422 and the third working fluid. A flow hole h3 communicating with the chamber 423 is opened. Therefore, the fluid L in the first working fluid chamber 421 and the fluid L in the second working fluid chamber 422 can flow with each other.

  Next, the operation of the vibration damper device 4 according to the embodiment will be described. Referring to FIG. 5, when self-excited vibration is generated in pulverizing roller 2, this self-excited vibration is transmitted to plunger 3 that follows pulverizing roller 2. Further, the self-excited vibration transmitted to the plunger rod 3 b is transmitted to the damping damper device 4 as a behavior that swings in the axial direction.

  Referring to FIG. 5 or FIG. 7, when the plunger rod 3 b moves outward, a force that deforms the damping damper 42 in the extending direction acts. During this time, the volume of the first working fluid chamber 421 expands inside the damping damper 42, while the volume of the second working fluid chamber 422 contracts, so that the fluid L in the second working fluid chamber 422 is It flows (moves) to the first working fluid chamber 421 via the third working fluid chamber 423. In this case, since the fluid L has viscosity, it becomes a flow resistance when passing through the flow holes h2 and h3, and the moving speed of the plunger rod 3b is decelerated (suppressed).

  On the other hand, referring to FIG. 5 or FIG. 7, when the plunger rod 3 b moves inward, a force that deforms the damping damper 42 in the direction to be compressed acts. During this time, the volume of the first working fluid chamber 421 contracts inside the damping damper 42, while the volume of the second working fluid chamber 422 expands, so that the fluid L in the first working fluid chamber 421 is It flows (moves) to the second working fluid chamber 422 via the third working fluid chamber 423. In this case, since the fluid L has viscosity, it becomes a flow resistance when passing through the flow holes h2 and h3, and the moving speed of the plunger rod 3b is decelerated (suppressed).

  Referring to FIG. 5 or FIG. 7, the vibration damping damper device 4 has the amplitude of self-excited vibration generated in the crushing roller 2 by alternately performing the action of reducing the moving speed of the plunger rod 3b in a short time. Is suppressed.

[Vertical mill grinding roller monitoring device]
Next, the configuration and operation of the monitoring device for the crushing roller of the vertical mill according to the embodiment of the present invention will be described. Referring to FIGS. 2 to 7, the vertical mill 10 according to the embodiment has a plurality of crushing rollers 2 arranged inside the outer shell covered in a dome shape, so that the dark interior of the vertical mill 10 is visually observed. Thus, it is difficult to confirm whether or not these crushing rollers 2 are rotating normally.

  The present inventor has found that it is possible to indirectly monitor that the crushing roller is not rotating normally by measuring the behavior of the vertical mill, such as the amplitude of the damping damper device, and the embodiment of the present invention. Invented a monitoring device for crushing rollers of vertical mills.

(First embodiment)
Referring to FIG. 1, the monitoring device 9 according to the first embodiment includes a vibrometer 91 and a monitoring panel 90. The vibration meter 91 is attached to the vibration control damper device 4. Then, the vibration meter 91 measures the amplitude value of the damping damper device 4. The amplitude value data of the vibration meter 91 is input to the monitoring panel 90.

  With reference to FIG. 1, vibrometer 91 may be attached to any one of a plurality of damping damper devices 4, or may be attached to all the damping damper devices 4 on a one-to-one basis. The vibration meter 91 can use a commercially available vibration type, and can be attached to the damping damper device 4 by appropriate attachment means such as a magnet or a clamp.

  Referring to FIG. 1, the vibrometer 91 and the monitoring panel 90 may be connected by wires such as electric wires or optical fibers, or may be connected wirelessly. As the monitoring panel 90, an existing (existing) monitoring panel or control panel can be used, and a display for the vibration meter 91 may be added to the existing monitoring panel. An alarm may be activated when value data is input.

  Referring to FIG. 1, the monitoring device 9 according to the first embodiment includes a vibrometer 91 that measures the amplitude value of the vibration control damper device 4, and a monitoring panel 90 that receives the amplitude value data of the vibrometer 91. ing. The monitoring device 9 according to the first embodiment can determine that the crushing roller 2 is not rotating normally because the amplitude value data is greatly reduced if the crushing roller 2 is not rotating normally. Further, the monitoring device 9 according to the first embodiment can determine whether or not the grinding roller 2 is rotated based on the amplitude value data sent from the vibrometer 91.

  The monitoring device 9 according to the first embodiment compares the amplitude value data acquired from a plurality of other vertical mills operating simultaneously with the amplitude value data, and determines whether or not the crushing roller is rotating normally. The amplitude value based on an empirical rule and the amplitude value data may be compared to determine whether or not the crushing roller is rotating normally.

(Second Embodiment)
Referring to FIG. 1, the monitoring device 9 according to the second embodiment includes a first pressure gauge 92, a second pressure gauge 93, and a monitoring panel 90. The first pressure gauge 92 is attached to the primary air supply pipe 12d. Then, the first pressure gauge 92 measures the pressure value of the primary air A1.

  Referring to FIG. 1, the second pressure gauge 93 is attached to the secondary air supply pipe 11a. Then, the pressure value of the secondary air A2 is measured by the second pressure gauge 93. The pressure value data of the first pressure gauge 92 and the pressure value data of the second pressure gauge 93 are input to the monitoring panel 90. The monitoring panel 90 can calculate differential pressure data between the pressure value data of the first pressure gauge 92 and the pressure value data of the second pressure gauge 93.

  Referring to FIG. 1, the second pressure gauges 93 are preferably attached to all (four) secondary air supply pipes 11 a on a one-to-one basis. In this case, it is preferable to control so that the second pressure gauge 93 attached to the secondary air supply pipe 11a where the cut damper 12a is open is operated, and the pressure value data of the second pressure gauge 93 is The pressure value data of the second pressure gauge 93 is preferably averaged to obtain the pressure value data of the second pressure gauge 93.

  The pressure value of the first pressure gauge 92 and the pressure value of the second pressure gauge 93 are preferably converted into an electrical signal from the pressure value obtained by mechanical means. Data can be transmitted as an electrical signal.

  Referring to FIG. 1, it has been empirically found that if the crushing roller 2 does not rotate normally (when the crushing roller 2 stops rotating), the differential pressure between the primary air A1 and the secondary air A2 increases. It was. It is estimated that this is because the coal stays at the bottom of the vertical mill without being sufficiently pulverized, thereby causing resistance in the flow path of the primary air A1.

  Referring to FIG. 1, the monitoring device 9 according to the second embodiment includes a first pressure gauge 92 that measures the pressure value of the primary air A1, a second pressure gauge 93 that measures the pressure value of the secondary air A2, and a first pressure gauge 92. A monitoring panel 90 capable of calculating differential pressure data between the pressure value data of the pressure gauge 92 and the pressure value data of the second pressure gauge 93 is provided. According to the monitoring device 9 of the second embodiment, if the pulverizing roller 2 does not rotate normally, the differential pressure data becomes large due to the fact that the pulverized coal cf is not normally manufactured. It can be determined that is not rotating normally.

  Further, the monitoring device 9 according to the second embodiment calculates differential pressure data between the pressure value data of the first pressure gauge 92 and the pressure value data of the second pressure gauge 93, and determines whether or not the grinding roller 2 is rotating. can do.

  The monitoring device 9 according to the second embodiment compares the differential pressure data acquired from a plurality of other vertical mills operating at the same time with the differential pressure data, and the grinding roller is rotating normally. The differential pressure value based on empirical rules and the differential pressure data may be compared to determine that the grinding roller is not rotating normally.

(Third embodiment)
Referring to FIG. 1, the monitoring device 9 according to the third embodiment includes an ammeter 94 and a monitoring panel 90. The ammeter 94 is connected to the electric motor 15. Then, the load current value of the electric motor 15 is measured by the ammeter 94.

  Referring to FIG. 1, the monitoring device 9 according to the third embodiment includes an ammeter 94 that measures the load current value of the electric motor 15, and a monitoring panel 90 to which load current value data of the ammeter 94 is sent. Yes. In the monitoring device 9 according to the third embodiment, if the crushing roller 2 does not rotate normally, the load current value data for rotating the crushing table 14 increases, and therefore the crushing roller 2 does not rotate normally. Can be determined. Further, the monitoring device 9 according to the third embodiment can determine the presence or absence of rotation of the grinding roller 2 based on the load current value data of the ammeter 94.

  The monitoring device 9 according to the third embodiment compares the load current value data acquired from a plurality of other vertical mills operating simultaneously with the load current value data, and the crushing roller is normally rotating. The load current value based on an empirical rule and the load current value data may be compared to determine that the crushing roller is not rotating normally.

  The monitoring apparatus according to the embodiment can also determine the presence or absence of rotation of the crushing roller from any two measurement data of the amplitude value data, the differential pressure data, and the load current value data. In combination, the presence or absence of rotation of the grinding roller can also be determined.

  Since the monitoring device according to the embodiment can confirm whether or not the crushing roller is rotating normally, the maintenance time of the crushing roller can be specified, and it is convenient without operating the vertical mill unnecessarily.

1 Body (Vertical container)
2 Crushing roller 2c Roller tire 3 Plunger 4 Damping damper device 9 Monitoring device 10 Vertical mill 14 Crushing table 90 Monitoring panel 91 Vibrometer cf Pulverized coal

Claims (6)

A cylindrical vertical container in which coal is charged and pulverized coal is produced by pulverizing the coal;
A crushing table disposed at the bottom of the bowl-shaped container and horizontally rotating by placing coal;
A plurality of swingable grinding rollers having roller tires that are rotated by friction transmitted to the grinding table;
A plunger that presses the crushing roller against the crushing table and biases a force that crushes the coal interposed between the crushing roller and the crushing table;
An operation of the crushing roller in a vertical mill, which is disposed on the outer wall of the vertical container and includes a vibration control damper device that suppresses the amplitude of self-excited vibration generated in the crushing roller in conjunction with the plunger. A monitoring device for monitoring
A vibration meter for measuring an amplitude value of the vibration damper device;
A monitoring device for a crushing roller of a vertical mill, comprising: a monitoring panel to which amplitude value data of the vibrometer is input. A cylindrical vertical container in which coal is charged and pulverized coal is produced by pulverizing the coal;
A crushing table disposed at the bottom of the bowl-shaped container and horizontally rotating by placing coal;
A plurality of swingable grinding rollers having roller tires that are rotated by friction transmitted to the grinding table;
A plunger that presses the crushing roller against the crushing table and biases a force that crushes the coal interposed between the crushing roller and the crushing table;
A primary air supply pipe to which primary air for blowing up pulverized coal produced in cooperation with the pulverization table and the plurality of pulverization rollers is blown above the vertical container;
In a vertical mill provided with a secondary air supply pipe in which pulverized coal blown up to the primary air is blown into secondary air and collected, a monitoring device for monitoring the operation of the grinding roller,
A first pressure gauge for measuring the pressure value of the primary air;
A second pressure gauge for measuring the pressure value of the secondary air;
A monitoring panel to which pressure value data of the first pressure gauge and pressure value data of the second pressure gauge are input, wherein the pressure value data of the first pressure gauge and the pressure value data of the second pressure gauge A monitoring device for a crushing roller of a vertical mill, comprising a monitoring panel capable of calculating differential pressure data. A cylindrical vertical container in which coal is charged and pulverized coal is produced by pulverizing the coal;
A crushing table disposed at the bottom of the bowl-shaped container and horizontally rotating by placing coal;
A plurality of swingable grinding rollers having roller tires that are rotated by friction transmitted to the grinding table;
A plunger that presses the crushing roller against the crushing table and biases a force that crushes the coal interposed between the crushing roller and the crushing table;
In a vertical mill comprising an electric motor having an output shaft connected to the pulverization table, a monitoring device that monitors the operation of the pulverization roller,
An ammeter for measuring a load current value of the electric motor;
A monitoring device for a crushing roller of a vertical mill, comprising: a monitoring panel to which load current value data of the ammeter is input. A cylindrical vertical container in which coal is charged and pulverized coal is produced by pulverizing the coal;
A crushing table disposed at the bottom of the bowl-shaped container and horizontally rotating by placing coal;
A plurality of swingable grinding rollers having roller tires that are rotated by friction transmitted to the grinding table;
A plunger that presses the crushing roller against the crushing table and urges a force to crush coal interposed between the crushing roller and the crushing table;
A damping damper device that is disposed on the outer wall of the bowl-shaped container, and suppresses the amplitude of self-excited vibration generated in the crushing roller in conjunction with the plunger;
A monitoring method of a crushing roller of a vertical mill comprising a vibration meter for measuring an amplitude value of the vibration control damper device,
A monitoring method for a crushing roller of a vertical mill that determines the presence or absence of rotation of the crushing roller based on amplitude value data sent from the vibration meter. A cylindrical vertical container in which coal is charged and pulverized coal is produced by pulverizing the coal;
A crushing table disposed at the bottom of the bowl-shaped container and horizontally rotating by placing coal;
A plurality of swingable grinding rollers having roller tires that are rotated by friction transmitted to the grinding table;
A plunger that presses the crushing roller against the crushing table and biases a force that crushes the coal interposed between the crushing roller and the crushing table;
A primary air supply pipe to which primary air for blowing up pulverized coal produced in cooperation with the pulverization table and the plurality of pulverization rollers is blown above the vertical container;
A secondary air supply pipe in which the pulverized coal blown up to the primary air is blown into the secondary air and collected;
A first pressure gauge for measuring the pressure value of the primary air;
A second pressure gauge for measuring a pressure value of the secondary air, and a monitoring method for a crushing roller of a vertical mill comprising:
A method for monitoring a crushing roller of a vertical mill that calculates differential pressure data between the pressure value data of the first pressure gauge and the pressure value data of the second pressure gauge, and determines whether or not the crushing roller is rotating. A cylindrical vertical container in which coal is charged and pulverized coal is produced by pulverizing the coal;
A crushing table disposed at the bottom of the bowl-shaped container and horizontally rotating by placing coal;
A plurality of swingable grinding rollers having roller tires that are rotated by friction transmitted to the grinding table;
A plunger that presses the crushing roller against the crushing table and biases a force that crushes the coal interposed between the crushing roller and the crushing table;
An electric motor having an output shaft connected to the grinding table;
An ammeter for measuring a load current value of the electric motor, and a monitoring method for a crushing roller of a vertical mill comprising:
A method for monitoring a crushing roller of a vertical mill that determines the presence or absence of rotation of the crushing roller based on load current value data of the ammeter.

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