JP5309549B2 - Equipment diagnosis method - Google Patents

Description

  The present invention relates to a failure diagnosis method for a raw material yard moving machine such as a stacker or a reclaimer, in which raw materials such as coal and ore are loaded into a yard and discharged.

  The reclaimer is a device that feeds ore and coal deposited in a pile of raw materials in a raw material yard to a ground conveyor, and a schematic configuration diagram is shown in FIG.

  The reclaimer 1 includes a boom 6 having a bucket-type wheel 4 that scoops the raw material from a pile of raw materials 12 at its tip, an apparatus main body including a turning unit 7 that turns the boom 6, and a rail 10. It is composed of a traveling unit 8. The boom 6 is supported by the wires 2, 3 and 5 so as to balance with the weight 9.

  FIG. 7 is a diagram for explaining the material discharging operation by the reclaimer. The boom 6 is swung in the direction of the arrow a along the edge of the mountain of the material 12 while scooping the material with the bucket wheel 4. The dispensed raw material is transferred from the boom conveyor to a belt conveyor (not shown) arranged along the rail 10 and conveyed to the next process.

  Since the work by the reclaimer is monotonous, various automatic control methods for unmanned work such as scooping the raw material of the bucket type wheel 4, turning of the boom and balance adjustment have been proposed.

  Patent Document 1 describes that a displacement sensor is installed in a turning portion that holds a boom and an abnormality in a load state is determined. Patent Document 2 describes that the speed of the turning electric motor is determined from the current value of the bucket wheel electric motor.

  Patent Document 3 describes that an integrating detector is attached in order to unmanned the reclaimer raw material dispensing operation, and the current value of the bucket wheel motor, the boom conveyor elevation angle, and the turning angle are measured.

  Japanese Patent Application Laid-Open No. H10-228688 describes that when performing boom turning and bucket wheel driving with hydraulic pressure, the equipment diagnosis of the hydraulic drive system is performed by measuring the hydraulic drain amount and hydraulic pressure.

  Patent Document 5 describes that a weight balance is diagnosed by comparing a current value of an electric motor that adjusts an elevation angle of a boom conveyor and an elevation angle.

  Patent Document 6 describes that an on-line equipment diagnosis is performed by measuring the stress of a swivel bearing mounting bolt.

  Patent Document 7 describes that a bucket wheel current value, a wheel rotation speed, a turning speed, and the like are detected to control a reclaimer discharge amount.

  Patent Document 8 describes a device that easily monitors the failure state of each device from a sequencer that comprehensively operates each device such as a moving machine and a belt conveyor installed in a receiving system, a payout system, and a coal feeding system. Yes.

  Patent Document 9 describes that the rotational speed of the foil is controlled by measuring the return amount of the bucket wheel.

Patent Document 10 describes that the current value of the foil, the rotation speed, the turning angle of the boom, and the like are measured and calculated in order to control the reclaimer discharge amount to be constant.
JP 2004-292146 A JP-A-58-202224 JP-A-1-261124 JP-A-4-189223 JP-A-4-191215 JP-A-4-338032 JP-A-8-133483 JP-A-10-198421 JP 11-49369 A JP 2000-142986 A

  By the way, in actual operation, the reclaimer may cause various failures listed in 1 to 6 below, and it is necessary to stop other than maintenance and inspection work, which affects operations such as a coke oven and a sintering factory.

  1. 1. Damage to the bearing inside the reduction gear of the bucket wheel drive unit. 2. Pin wear due to poor lubrication of the pin of the lifting device 3. Bearing damage due to insufficient lubrication of vibratory feeder shaker. 4. Decrease in the amount of material discharged due to the bucket foil's bucket claw dropping off, etc. 5. Decrease in the amount of material discharged due to material adhering to and accumulating on bucket foil, Reduced raw material transfer capacity due to deterioration of the cylindrical rubber connecting the vibrator feeder and trough.

  Among these, because the damage listed in 1 to 3 is gradually progressing, in the diagnostic method described in Patent Documents 1 to 10, the failure occurs when the electric motor of the drive device is in an overcurrent state, It can be detected only when the operation is stopped, and a long-time failure stop is inevitable. The damage listed in 4 to 6 can be detected only by visual inspection performed with the equipment stopped.

  Therefore, in order to avoid sudden stoppage, the present invention can diagnose failure of equipment such as a reclaimer capable of taking measures such as grasping the state of trouble and performing equipment replacement work in a regular repair plan until the equipment is damaged. It aims to provide a method.

The object of the present invention can be achieved by the following means.
1. Grasp the temporal change of the no-load current value of the motor for driving the device, when the change amount is larger than a predetermined threshold value, met equipment diagnosis consumables member is determined to have reached the time to replace the drive system The device is a reclaimer, the electric motor is for driving a bucket wheel and / or a boom conveyor, and the consumable member is a bearing for a reduction device for a bucket wheel driving device, a pin for a lifting device, a vibration feeder shaker At least one of these bearings, and further grasp the temporal change in the current value of the bucket wheel drive motor during load operation, and based on the correlation between the amount of discharge and the load current value obtained in advance, the raw material by the reclaimer A facility diagnosis method characterized by monitoring the amount of payout .

  According to the present invention, it is possible to always grasp the state of a device that causes a failure due to a phenomenon that gradually progresses, such as wear, and replace it before the device is damaged. It is extremely useful.

  The present invention is characterized in that the degree of wear of a consumable member in a device is determined from a current value of an electric motor in no-load operation. Hereinafter, the present invention will be described in detail with reference to the drawings, with a reclaimer as an application target.

  FIG. 1 shows a temporal change in the current value of the electric motor for driving the bucket foil of the reclaimer. Since the reclaimer scoops the raw material with the bucket wheel while moving the boom along the edge of the raw material peak, the bucket wheel is temporarily put into a no-load operation when the boom is removed from the edge of the raw material peak.

  In the figure, a1 to 4 indicate current values during load operation, and b1 to 4 indicate current values during no-load operation. The current value detected during no-load operation is a current value required only for driving the bucket wheel, and increases when the friction of the drive system increases due to wear or the like.

  Therefore, the present invention grasps the change with time of the no-load current value, and determines that the drive system has reached the replacement time when the amount of change becomes larger than a predetermined threshold. The change with time is, for example, the current value itself or the difference between the current values before and after, for example, the difference Δ between the current values b3 and b2.

  FIG. 2 shows the case where the upper and lower thresholds are set for the current value during no-load operation, and wear progressed in time and the current value increased and reached the upper threshold at time t1. Show the case. When the threshold is reached, an alarm is issued and a part of the drive system is replaced.

  In the case of a reclaimer, when the electric motor for detecting the current is for bucket wheel drive and / or boom conveyor drive, the consumable member to be replaced is the bearing of the reducer for the bucket wheel drive device, the pin of the lifting device, the vibration feeder shaker At least one of the bearings.

  Note that the change in the current value of the driving motor during the load operation detected at the same time can be used for monitoring the amount of material discharged by the reclaimer.

  FIG. 3 schematically shows a temporal change in the current value of the electric motor for driving the bucket foil of the reclaimer, and FIG. 4 schematically shows a change in the payout amount measured simultaneously. Since there is a correlation between the payout amount and the load current value, the payout amount can be monitored by comparing the measured value with the threshold value of the current value obtained from the relationship between the payout amount and the bucket load current value. is there.

  FIG. 5 shows the relationship between the load current value and the threshold value. When the load current value exceeds the upper limit threshold value, it is determined that the payout amount is abnormally large, and the worker confirms the work status.

  As mentioned above, although this invention was demonstrated to the reclaimer, it is effective as a judgment method of the abrasion state of the mechanical system driven with an electric motor, and does not limit an object.

The figure which shows the time change of the electric current value of the electric motor for bucket foil drive of a reclaimer. The figure which shows the case where the threshold value of an upper limit and a minimum is set with respect to the electric current value at the time of no-load driving | operation obtained in FIG. The figure which shows typically the time change of the electric current value of the electric motor for bucket foil drive of a reclaimer. The figure which shows typically the change of the amount of payout in the case of FIG. The figure which shows the relationship between the load electric current value calculated | required from FIG. The figure explaining a reclaimer. The figure explaining the paying-out work by a reclaimer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reclaimer 2, 3, 5 Wire 4 Bucket type wheel 6 Boom 7 Turning part 8 Traveling part 9 Weight 10 Rail 12 Raw material

Claims (1)

Grasp the temporal change of the no-load current value of the motor for driving the device, when the change amount is larger than a predetermined threshold value, met equipment diagnosis consumables member is determined to have reached the time to replace the drive system The device is a reclaimer, the electric motor is for driving a bucket wheel and / or a boom conveyor, and the consumable member is a bearing for a reduction device for a bucket wheel driving device, a pin for a lifting device, a vibration feeder shaker At least one of these bearings, and further grasp the temporal change in the current value of the bucket wheel drive motor during load operation, and based on the correlation between the amount of discharge and the load current value obtained in advance, the raw material by the reclaimer A facility diagnosis method characterized by monitoring the amount of payout .

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