JPS63241315A - Method for detecting abnormality of weighing machine of raw material weighing hopper - Google Patents

Abstract

PURPOSE:To detect the abnormality of the weighing machine of a raw material weighing hopper, by detecting the time, before the weighing value of the weighing machine of the raw material weighing hopper having a raw material charged therein reaching the first set value reaches the second set value, each time when the raw material is charged to store the same. CONSTITUTION:During a raw material charging section wherein the charging speed of a raw material to a raw material weighing hopper 5 or 6 is stable, LI or LII is set to a weighing time measuring apparatus as the first set value between the min. weighing value weighed by a weighing machine I or II and the max. weighing value weighed thereby and, further, for example, HI or HII is set to said measuring apparatus as the second set value. Then, the times TI, TII before the weighing values measured by the weighing machines I, II reaching the first set values LI, LII set at every weighing machines I, II reach the second set values HI, HII are measured to be stored in a computer. The inspection of the significant difference between the weighing machines is performed on the basis of the above-mentioned times and set values to detect the abnormality of the weighing machines of the raw material weighing hoppers.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention has a pair of raw material weighing droppers into which raw materials cut from a plurality of raw material storage tanks are alternately charged via a belt conveyor and a cut-out chute. The present invention relates to a method for detecting an abnormality in a weighing machine of the raw material weighing hopper in a raw material processing facility.

(Prior Art) Fig. 1 shows an example of raw material processing equipment to which the present invention is directed, in which 1 is a plurality of raw material storage tanks installed in parallel, and 2 is a tank for cutting out the raw material, such as coke. The belt conveyor 3 transfers the raw material cut out by the feeder 2 to the weighing machine 1.11 installed afterwards.
It is used to transport the raw material to the raw material weighing hopper 5.6. In the raw material weighing hoppers 5 and 6, feeders 2. The conveyor 3 is operated at high speed and then at low speed until the target weighing value is reached, and the raw material is alternately charged into the empty weighing hopper 5 or 6 via the switching soute 4 of the raw material weighing hopper 5.6. The raw materials charged up to the target weight value are transferred to the charging conveyor 9 as necessary.
It is then supplied to the next step, for example a blast furnace, through which the above operating operations are repeated.

(Problems to be Solved by the Invention) Now, in such a facility operation mode, the weighing machine 1. of the raw material weighing hopper 5.6. In order to conduct the II test,
Because it takes about half a day, it could only be carried out in the next step, such as blast furnace winding.

Also weighing machine 1. The II certification is known to be a weight test performed by placing a weight on a weighing machine, but the test results include ■Dust intrusion or accumulation in the weighing section, ■Causes coming off, ■Damage to the blade or blade holder, etc. As a result, there were many cases where the weighing value suddenly became abnormal. In other words, the operator was not aware of the above-mentioned weighing abnormality during the operation, and after that, an intervening period of abnormal operation of the blast furnace, equipment abnormality, etc. occurred in the next process, for example.

(Means for Solving the Problems) The present invention solves the problems of the conventional method, and its feature is that raw materials cut from a plurality of raw material storage tanks are alternately charged via a belt conveyor and a cut-out chute. In a raw material processing equipment that has a pair of raw material weighing hoppers, the charging speed of raw materials charged into the raw material weighing hoppers is in a stable charging section from the minimum weight value weighed by the weighing machine of the weighing hopper to the maximum value. A first set value and a second set value are set between the weighed values, and the weighed value of the weighing machine of the raw material weighing hopper charged with raw materials reaches the first set value until it reaches the second set value. The purpose of the present invention is to detect and store the time for each raw material charging, and to detect an abnormality in the weighing machine of the raw material weighing hopper by performing a significant difference test of the weighing machine based on the above-mentioned time or the above-mentioned time and the above set value.

Hereinafter, the method of the present invention will be explained in detail with reference to the drawings.

FIG. 2 is a block diagram showing an example of the configuration of an abnormality detection device for carrying out the method of the present invention applied to the raw material processing equipment example of FIG. 1. The present invention is a weighing machine with a raw material weighing hopper of 5.6! , ff do not fall into an abnormal state at the same time, and in a specific charging section where the charging speed to the raw material weighing hopper 5.6 is changed as will be described later.
This method focuses on the fact that there is almost no difference between the weighing machines 1 and 11, and the weighing time measuring device 11
．． Test calculator 12. Screen display device 13. Alarm device 1
It consists of 4. The weighing time measuring device 11 is a weighing machine ■.

The weight value measured by weighing machine 1. The first set value Ll is set for each II, and the second set value HI is set after reaching LII.
, Measure the time TI and TII until reaching HII,
The weighing times TI and TII are manually entered into the computer 12, a weighing test (described later) is carried out in the calculator 12, and the result is displayed on the display device 13, or in the event of an abnormality, the alarm device 13 notifies the operator as an alarm. ing.

FIG. 3 shows the relationship between the weighing value (ton) of the weighing machine I or H of the raw material weighing hopper 5 or 6 and the charging time (sec).

In the initial charging period A, the belt conveyor was operated at low speed while the belt conveyor speed was changed from B to A in the latter period of charging to hopper 6 or 5, and the charging speed is still low because it continues to operate at low speed. The weight is small and the weighing continues to be unstable. After that, when entering the raw material charging middle section entrance, the belt conveyor speed changes to high speed, the charging speed increases, and stable weighing begins to continue, but when the weighing value of weighing machine I or H reaches B, the belt conveyor speed changes to high speed. The conveyor speed becomes low and changes to a small section of unstable charging speed (last stage section of raw material charging c).
Thereafter, the weighed value reaches A, and after waiting for a predetermined time (weighing completion, waiting section 2), the dispensing section (e) is repeated. In each of the above sections, for example, from the minimum to the maximum weighed by the weighing machine I or
1 or LH as the first setting value, and further, for example, Hl or H
Set n as a second setting value in the weighing time measuring device 11,
Weighing machine 1. The weight value measured by I[ is the weighing value measured by weighing machine 1, [
The time TI from when the first set value Ll, LII set for each time is reached until the second set value H[, HII is reached.

The TII is measured and stored in the computer 12.

In the case of (I-11-11)-(HIT-LH), using the above times TI and Tll as base data, (HI-L
If I)≠(HII-LII), then TI/(1-II
-L I), TII/(HII-Ln) as the data beta, always test whether there is a significant difference between the m values of the weighing machines ■ and ■ using n new data, and if there is a difference, the operator This is to detect abnormalities in the weighing machine at an early stage.

A significant difference test for the above data is performed by employing, for example, a method for testing differences in average values. Specifically, (Hl-L I) =
In the case of (1-111-Lll), in equation (1), (Hl
-Ll)≠(HID-LI[), in equation (2), U
The U value is calculated, and if the U value exceeds a predetermined normal value, an alarm is issued and managed.

TI-TII (Example) Fig. 4 shows a weighing machine (■) of the raw material processing equipment shown in Fig. 1, in which the raw material is coke and the next step is a blast furnace.

H's T I/ (HI -L I
) (see/1on), T n/
(Hll-LH) (sec/lor+) is a transition diagram of weighing machine I.

When a difference in . As a result, problems such as malfunctions in blast furnace operation and equipment malfunctions in the next process could be effectively prevented.

Note that the U value in Figure 5 was calculated using equation (2),
HI = 6.2 (ton), LI = 2.2 (t
on), HII = 7.2 (ton), L If
= 2.5 (ton).

(Effects of the Invention) As detailed above, the method for detecting an abnormality in a weighing machine for a raw material weighing hopper of the present invention conventionally allows the weighing machine to be inspected only during periodic repairs, and it is only at that time that it becomes clear whether or not there is an abnormality. However, since it is possible to detect abnormalities at all times during operation, it is possible to take action to eliminate the cause of the abnormality almost as soon as it occurs, and to prevent operational abnormalities and equipment abnormalities in the next process due to weighing machine abnormalities. can be avoided.

[Brief explanation of the drawing]

The drawings are all explanatory diagrams of the method of the present invention. Figure 1 is an explanatory diagram of raw material processing equipment, Figure 2 is a block diagram of an example of the configuration of equipment for carrying out the method of the present invention, and Figure 3 is an illustration of charging time and weighing value. 4.5 is a detailed explanatory diagram of the present invention. l... Raw material storage tank 2... Feeder 3Φ... Belt conveyor 4... Chute 5.6... Pair of raw material weighing hoppers 9... Charging Belt conveyor 11 ... Scale m Time measurement device 12 ... Calculator 13 ... Screen display device 14 ... Alarm device! , Il..., Weighing machine Figure 3

Claims (1)

[Claims] In a raw material processing facility having a pair of raw material weighing hoppers into which raw materials cut from a plurality of raw material storage tanks are alternately charged via a belt conveyor and a cutting chute,
The first setting value and the second value are set between the minimum weight value and the maximum weight value weighed by the weighing machine of the weighing hopper in the charging section where the charging speed of the raw material charged into the raw material weighing hopper is stable.
Setting a set value, detecting and memorizing the time from when the weighing value of the weighing machine of the raw material weighing hopper into which the raw material is charged reaches the first set value until it reaches the second set value each time the raw material is charged; A method for detecting an abnormality in a weighing machine of a raw material weighing hopper, characterized in that an abnormality in the weighing machine of the raw material weighing hopper is detected by performing a significant difference test of the weighing machine based on the above-mentioned time or the above-mentioned time and the above-mentioned set value.