JPH06147766A - Diagnosing method of spike roller type crusher of dl type sintering machine - Google Patents

Abstract

PURPOSE:To enable detection of a loaded state of a spike roller type crusher of a DL type sintering machine and estimation of a cause of occurrence of an over load, to enable preparation of a countermeasure for removing the cause when the overload occurs, and also to make it possible to shorten the time for searching the cause of the overload in a large degree and thus to cope with abnormality rapidly when it occurs. CONSTITUTION:A current value of a drive motor 9 is measured by an ammeter 16. From a revolution speed meter 17 fitted to the shaft of the drive motor 9 and a revolution speed meter 18 fitted to an input shaft of a reduction gear 10, the number of revolutions is measured respectively. Signals of the current value and the numbers of revolutions thus obtained are inputted to a computer 19 and subjected to arithmetic processings by the computer 19 and data obtained thereby are displayed on CRT 20. Moreover, the computer 19 executes comparative processings of the data processed arithmetically with reference values set beforehand, and when the processed data exceed the reference values, it executes an alarm output and makes the CRT 20 display it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diagnostic method for detecting an operating load condition of a spike roller type crusher of a DL type sintering machine.

[0002]

2. Description of the Related Art Generally, a DL type sintering machine, as shown in FIG. 2, has a sprocket 2a on the feed side and a sprocket 2 on the discharge side.
b, a pallet truck 3, a wind box (not shown), and the like, and the sinter ore raw material charged on the pallet truck 3 is fired, and the pallet truck 3 on the discharge side of the sintering machine 1 Emitted from above. The discharged sinter fell onto the crushing guide 4 and was crushed by the rotating blade 6 of the spike roller crusher 5,
It is sent to a cooler (not shown) in the next step.

Next, referring to FIG. 3, when the pallet truck 3 is reversed by the sprocket 2b on the discharge side, the sintered ore (not shown) on the pallet truck 3 is discharged and first falls onto the crashing guide 4. . Thereafter, the sinter ore placed on the plate 8 of the spike roller crusher 5 is crushed by the rotary blade 6 passing through the gap of the plate 8. The rotation of the blade 6 is driven by the drive motor 9 and the speed reducer 1.
Between 0, the V-belt 13 is applied to the pulley 11 on the motor side and the pulley on the reducer side, the power of the drive motor 9 is transmitted to the reducer 10, and the pinion gear 1 connected to the output shaft of the reducer 10 is connected.
It is a mechanism in which the shaft 7 and the blade 6 of the spike roller type crusher 5 are rotated by the meshing of 4 and the large gear 15.

In the spike roller type crusher 5, the reduction gear 10, the pinion gear 14, and the large gear 15 are not properly meshed,
The load may be increased due to factors such as contact between the blade 6 and the plate 8 and abnormal firing of the sintered ore, resulting in overload. In this case, in order to protect devices such as the drive motor 9 and the speed reducer 10 of the spike roller crusher 5,
The motor-side pulley 11 of the drive motor 9 is provided with a transmission torque suppression device that suppresses the power and torque transmitted at a certain level.

FIG. 4 shows a sectional structural view of the transmission torque suppressing device. A sleeve 38 is fitted on the drive motor shaft 30 and fixed by a key 37. The motor-side pulley 11, the friction plate 31, the disc spring 32, and the holding plate 33 are fitted into the sleeve 38. A male screw is formed on the outer periphery of the shaft end side (right side in FIG. 4) of the sleeve 38, and a female screw is provided on the inner diameter of the bolt guide 34. The female screw is screwed into the male screw of the sleeve 38, and the sleeve 38 is bolted. The guide 34 is fixed, and the fixing nut 36 is further tightened on the outside thereof to fix the sleeve 38 and the bolt guide 34. The bolt guide 34 is provided with four threaded bolt holes in the circumferential direction, and pressing bolts 35 are arranged in the bolt holes.

With such a structure, when the pressing bolt 35 is screwed in, the pressing plate 33 presses the disc spring 32 against the friction plate 31, and the disc spring 32 moves the friction plate 31 to the sliding surface of the motor side pulley 11. Abut 39. This allows
Friction resistance is generated between the friction plate 31 and the sliding surface 39, and the rotational force of the drive motor shaft 30 is transmitted to the motor side pulley 11.

At this time, the torque transmitted from the drive motor shaft 30 to the motor side pulley 11 is adjusted by adjusting the screwing amount of the pressing bolt 35. When an excessive torque is generated in one of the drive motor shaft 30 and the motor-side pulley 11, slippage occurs between the friction plate 31 and the sliding surface 3a, and the motor-side pulley 11 idles to transfer the transmission torque. It is supposed to be restricted.

On the other hand, the drive motor 9 is also provided with an overcurrent protection device. FIG. 5 is an example of a schematic circuit diagram of an overcurrent detector of this overcurrent protection device. In FIG. 5, when a current more than the rated value flows in the drive motor 9, the overcurrent detector 41 detects the overcurrent by using the transformer 40 for a meter, and when the current more than a predetermined value flows, the breaker 42 is activated. It is activated to cut off the current.

When an overcurrent continuously flows for a predetermined time or longer, the heating causes the thermal relay 43 to operate, and the contactor 44 interlocking with the thermal relay 43 is cut off to cut off the current to the drive motor 9. I am trying.

[0010]

The problems of the prior art relating to the detection of the load condition in the spike roller type crusher of the above DL type sintering machine will be described below. First, since the transmission torque suppression device does not have a device that outputs a slippage in the transmission torque suppression device when an overload occurs in the spike roller crusher, operating personnel or equipment management personnel are It was not possible to detect the occurrence of overload of the spike roller crusher.

Further, in the overcurrent detection using the current value signal of the drive motor, the timing of occurrence of the overcurrent due to the overload can be detected, but it is difficult to estimate the cause of the overload. Therefore, in the prior art, it is difficult to detect the load state of the spike roller crusher in advance, which causes a sudden failure or stop of the spike roller crusher, which causes an operation stop or a decrease in the production amount. Also, as a means to prevent these, strengthening inspection of spike roller type crushers by operating personnel or facility management personnel, but much labor and time are required for inspection work to prevent sudden failure that does not know when it will occur. there were.

An object of the present invention is to provide a method for diagnosing whether the spike roller type crusher of the DL type sintering machine is normal or abnormal, which solves the above problems.

[0013]

The present invention is applied to a spike roller type crusher equipped with a transmission torque suppressing device for crushing sinter ore discharged from a DL type sintering machine, which is a spike. The rotational speed of each of the drive motor shaft that rotationally drives the blade of the roller crusher and the input shaft of the speed reducer that transmits the rotational power of the drive motor to the blade is measured, and this rotational speed measurement signal and the current value signal of the drive motor are measured. Input into the calculator, and calculate the difference between the two measured rotation speeds and the magnitude of the current value of the drive motor by the calculator,
It is characterized in that the operating load state of the spike roller crusher is detected by comparing and determining a preset reference value and a calculated value.

[0014]

1 is a block diagram of an embodiment of the present invention. As shown in FIG. 1, first, the current value of the drive motor 9 is measured by the ammeter 1
Measure with 6. Similarly, the rotational speed of the drive motor 9 and the rotational speed of the input shaft of the reduction gear 10 are measured from the rotational speed meter 17 attached to the shaft of the drive motor 9 and the rotational speed meter 18 attached to the input shaft of the reduction gear 10. These current value and rotation speed signals are input to the computer 19, as shown in FIG. The computer 19 performs a predetermined arithmetic processing of each input signal, displays the processed data on the CRT 20, and constantly monitors the load state of the spike roller crusher 5. Further, in the computer 19, the processed data and the preset reference value are compared and calculated, and when the processed data exceeds the reference value, an alarm is output and can be displayed on the CRT 20.

The calculation of signals of the current value of the drive motor and the rotation speed of the drive motor and the input shaft of the speed reducer, comparison judgment with a reference value, and the output method of the result will be described with reference to FIG. . First, the average current value and the maximum current value are calculated from the current value signal of the drive motor. The average value is compared and judged with a preset upper limit value (judgment 1),
For example, if 70 A or less, output 1 (normal), and if 70 A or more, output 2 (overcurrent) is output. The maximum value of the current is compared with the maximum value upper limit value to make a determination (determination 2). For example, 100A
Output 3 is output in the following cases, and output 4 is output in the case of more than 100A. On the other hand, the rotational speed difference is calculated using the rotational speed signals of the drive motor and the speed reducer input shaft. A comparison judgment (judgment 3) is made between this rotation speed difference and a preset reference value of the rotation speed difference. For example, the rotational speed difference is 10 r. p. If m or more, output 5 is output and 10r. p. If it is less than m, output 6 is output. If both the output 1 of the determination 1 and the output 6 of the determination 3 are established, it is determined that the load state of the spike roller lasher is normal, and normal operation is displayed on the CRT.

Next, if both the output 2 of the determination 1 and the output 3 of the determination 2 are satisfied, it is determined that the load of the spike roller crusher is increased, and this is displayed on the CRT. Further, if both the output 4 of the determination 2 and the output 5 of the determination 3 are established, it is determined that the spike roller crusher is in an overload state and the transmission torque suppression device is slipping, and this is determined. Display on CRT.

By the above determination, the load state of the spike roller type crusher 5 can always be detected and monitored online.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. The DL type sintering machine to which the present invention is applied has a sinter production amount of 7,000 T / day and an effective suction area of 210 m ² . The spike roller type crusher has a sinter crushing processing amount of 11,000 T / day and a blade rotation speed of 8.5 rp.
m, drive motor output 150 kW.

First, in FIG. 1, the spike roller crusher 5 rotates to the shaft end of the drive motor 9 (opposite side of the pulley 11 on the motor side) and the speed reducer 10 to the end of the input shaft (opposite side of the pulley 12 on the speed reducer side). The number of revolutions of the drive motor 9 and the number of revolutions of the input shaft of the speed reducer 10 are measured by providing the number meters 17 and 18. Further, the ammeter 1 of the drive motor 9
A current signal was output from No. 6, and all the measurement signals of the current values of the drive motor 9 and the rotational speeds of the input shafts of the drive motor 9 and the speed reducer 10 were input to the computer 19. In the computer 19, each input signal was used to perform an arithmetic processing on the signal in accordance with the arithmetic processing flow shown in FIG. To explain this, the current value of the drive motor 9 is set at a certain fixed interval (in the present embodiment, 1
Every minute) and calculate the average and maximum values.
Further, the difference between the rotational speeds of the drive motor 9 and the input shaft of the speed reducer 10 is detected.

The average value of the current value and the upper limit value (70A) are compared and a signal in the corresponding range is output (output 1 or output 2). In addition, the maximum value of the current value and the maximum value upper limit value (10
0A), the level of the peak current value is determined, and the signal in the corresponding range is output (output 3 or output 4). Further, the difference in the number of revolutions is compared with the upper limit value (10 rpm), and a signal in the corresponding range is output (output 5
Or output 6).

A diagnostic example in one embodiment of the present invention will be described below with reference to FIG. The upper part of each diagram of Diagnosis Examples 1 to 3 shows a trend graph of the current value signal of the drive motor of the spike roller crusher, and the lower part of the same figure shows the trend graph of the rotation speed difference signal between the drive motor and the speed reducer input shaft. In (a) Diagnosis Example 1 of FIG. 7, both the current value and the rotation speed were below the upper limit values, indicating a normal operation state.

The second diagnostic example (b) of FIG. 7 is an example in which a state in which the current value exceeds the upper limit value occurs and it is detected that the load on the spike roller crusher has increased. In this diagnostic example, since the crushing interval of the sinter discharged from the sinter machine and the interval of the increase in the current of the drive motor were almost the same, abnormal sintering of the sinter (the sinter became too hard) ) Was found to have been caused.

In the diagnosis example 3 of FIG. 7C, the current value of the drive motor exceeds the upper limit value, and the difference in the number of revolutions also exceeds the upper limit value. In this state, the increase interval of the current value and the difference in the number of revolutions matches the rotation interval of the blade of the spike roller crusher, and when the blade of the spike roller crusher rotates, it comes into contact with the plate,
This is an example of investigating that the spike roller type crusher is overloaded.

[0024]

The effects of the present invention will be described below. First, a rotation speed measuring device is provided on each of the drive motor shaft and the speed reducer input shaft of the spike roller type crusher of the DL type sintering machine, and the difference between the two measured rotation speed signals is calculated by the computer that inputs the signals. In addition, the current value of the drive motor is also measured and compared with the reference value set in advance together with the above-mentioned rotational speed difference, and the result is displayed on the CRT connected to the computer, so that conventional detection is impossible. However, when an overload occurs in the spike roller crusher, it is possible to reliably detect the slip that has occurred in the transmission torque suppression device and to detect the abnormal load state of the spike roller crusher.

The calculated value of the rotational speed difference and
The time interval at which the current value of the drive motor increases remarkably is measured with a computer, and compared with the time interval measured when various abnormalities occur and the spike roller type crusher is overloaded. By doing so, it is possible to estimate the cause of overload that was not possible in the past, and even when an overload occurs, it is possible to prepare in advance countermeasures to eliminate the estimated factor. The time to search for was greatly reduced, and it was possible to respond promptly when an abnormality occurred.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating an embodiment according to the present invention.

FIG. 2 is an explanatory diagram of a DL type sintering machine.

FIG. 3 is a perspective view explanatory diagram of a discharge part and a spike roller type crusher of the DL type sintering machine.

FIG. 4 is a sectional view of a transmission torque suppressing device of a spike roller type crusher.

FIG. 5 is a schematic circuit diagram of an overcurrent detection device for a spike roller type crusher.

FIG. 6 is a diagnosis and management flowchart of a spike roller type crusher.

FIG. 7 is a trend graph showing an example of diagnosis of a load state of a spike roller type crusher and an example of abnormality detection in an example of the present invention.

[Explanation of symbols]

1 DL type sintering machine 2a Mining side sprocket 2b Mining side sprocket 3 Pallet trolley 4 Crushing guide 5 Spike roller crusher 6 Blade 7 Shaft 8 Plate 9 Drive motor 10 Reducer 11 Motor side pulley 12 Reducer side pulley 13 V-belt 14 Pinion gear 15 Large gear 16 Ammeter 17 Revolution counter 18 Revolution counter 19 Calculator 20 CRT 30 Drive motor shaft 31 Friction plate 32 Disc spring 33 Holding plate 34 Bolt guide 35 Press bolt 36 Fixed nut 37 Key 38 Sleeve 39 Sliding Surface 40 Meter transformer 41 Overcurrent detector 42 Circuit breaker 43 Thermal relay 44 Contactor

Claims (1)

[Claims] 1. A rotation speed of a drive motor shaft of a spike roller type crusher having a transmission torque suppressing device provided on a drive motor shaft and a rotation speed of a reduction gear input shaft are respectively measured, and each signal of the rotation speed measurement value and the drive motor. A DL which is characterized in that a current value signal is inputted to a computer, a difference between the two measured values of the number of revolutions and a current value of a drive motor are respectively compared and judged with a reference value, and an operating load state of the spike roller crusher is detected. Method for spike roller type crusher of rotary sintering machine.