JPH0140937B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sampler placed on the tail of a belt conveyor that conveys a powder mixture of iron ore, etc., and a cutter-type condenser placed on the tail of a feeder to which the sample sampled by the sampler is supplied. , performing a first sampling with the sampler, sampling with the sampler every time the conveyed weight reaches a set value after the first sampling, and measuring the sample weight of each of these samples; Based on this weight and the number of times of sampling in the cutter-type condensing machine, a sampling interval is calculated and determined, and at this interval, the cutter of the cutter-type condensing machine is operated to reduce the above sample to obtain a sample for measuring quality characteristics. In the sample collection equipment that collects samples, every time a cutter start signal is received, the cutter of the cutter-type condensing machine is activated to collect the sample.The cutter-type condensing machine sends a cutter start signal to the cutter automatic control device of the cutter-type condensing machine. This invention relates to a cutter start signal transmitting device for a reduction fractionator.

When receiving powder mixtures such as imported iron ore, samples are taken during the unloading and transportation process from ore ships, and this sample is further reduced to obtain a sample, and various characteristic values of this sample (for example, composition Acceptance inspections are conducted by measuring the grain size, grain size, and moisture content.
In order to measure the quality characteristic values of such a powder mixture such as iron ore, the powder mixture is sampled,
When further reducing this sample and collecting a sample using the cutter reduction method, JIS
The standard has the following provisions. That is, it is specified that the sampling interval is constant, the amount of sampling is at least a specified amount, and the number of sampling lots is 4 or more.

Figure 1 shows an outline of a cutter-type reduction equipment (sample collection equipment) that satisfies the above JIS regulations as a general receiving and conveying equipment for imported iron ore. Using one or two unloaders (not shown) from
is intermittently supplied to the belt conveyor 2 via the hopper 1. The iron ore flowing on the belt conveyor 2 falls from the tail 3 of this conveyor 2 and is transferred onto the next iron ore conveying belt conveyor (not shown). A sampler disposed at the tail outlet 3 of the unloading belt conveyor 2, for example, a cutter 5 of a cutter type sampler 4.
First, sample a sample.

Specifically, for example, a box-shaped cutter 5 of the sampler 4 whose bottom plate can be opened and closed runs across the tail opening 3 in the width direction of the conveyor belt 2 with the bottom plate closed, and samples the sample into the cutter 5. , the bottom plate is opened at the end position of the cross-travel, and the sample is delivered to the sample conveyor belt conveyor 9 provided below this position. Then, with the bottom plate left open, the vehicle returns to the crossing start position and closes the bottom plate.

The running operation of the cutter 5 of the cutter type sampler 4 is controlled by a conveyor scale 6 that detects the flow rate (Kg/sec) of iron ore flowing on the conveyor 2,
When the flow rate of iron ore is detected on this scale 6,
Integration of the flow rate signal of the scale 6 is automatically started, and when the initial (first) cutter start signal is input manually, the above integration value is cleared and the integration of the flow rate signal of the scale 6 is started, and from then on. , the predetermined weight (set value) for which this integrated value is set in advance
A cutter start signal transmitter 7 that clears this cumulative value every time the cumulative value reaches , restarts the cumulative value, and at the same time transmits a cutter start signal; When the cutter start signal from the scale 7 is input, the scale 6
A cutter type comprising a cutter automatic control device 8 that automatically operates the cutter 5 to cross-travel with a time lag of Δt ₁ , the ore transfer time from the position to the tail of the conveyor 2, and automatically controls the series of sampling operations. This is done automatically by the control device of the sampler 4.

The initial (first) cutter start signal is set at any timing after the flow rate of iron ore is detected on the scale 6 until the integrated value of the signal transmitter 7 reaches the set value for the first time. Manual input to transmitter 7 and device 8.

The sample sampled by the sampler is conveyed by belt conveyors 9, 10, 11 which convey the sample every time it is sampled, and if the sample is lump ore, it is conveyed by a sieving device 12.
The bottom part of the sieve is directly fed to the belt conveyor 14, the top part of the sieve passes through the crushing device 13 to the conveyor 14,
If the sample is fine ore, it flows directly to the belt conveyor 14, is stored in the hopper 15, and the weight of the sample is measured with the hopper scale 16. Specifically, the scale 16 converts the analog weight signal into A/
The digital weight signal is sent to the D converter 17, and the converter 17 sends out a digital weight signal. That is, the scale 16 and the converter 17 constitute a digital weight measuring device 38. The digital weight signal converted by the A/D converter 17 is input to the minicomputer 18. A minicomputer (hereinafter abbreviated as minicomputer) 18 controls a feeder, for example, a belt feeder 22, based on this weight signal
sampling interval for fractionation of the sample by a cutter type fractionator 19 arranged at the tail of the belt conveyor 24 of the cutter type fractionator 19;
The operation interval of the cutter 20 is determined.
Specifically, when the sample weight is xKg, the sample feeding speed of the belt feeder 22 is yKg/sec, and the number of sampling times is n (JIS standard; n4), the sampling (operation) interval time tsec is expressed as x/ny. For example, when y=4Kg/sec, n=5 times, x=
For 200, 300, 400, 500Kg, t=10, 15, 20,
It will be 25 seconds.

The sample weighed on the hopper scale 16 is transferred from the hopper 15 to the skip elevator 2.
1 and further supplied to the hopper 23 of the belt feeder 22. Next, belt feeder 2
The second belt conveyor 24 starts transporting the sample cut out from the hopper 23 at a constant sample feed rate yKg/sec. This transfer start is detected by the conveyor operation start detector 2 of the belt feeder 22.
5, this signal activates the timer 26, and when the timer 26 has passed the preset transfer time Δt ₂ for the sample to reach the tail of the conveyor 24 from the hopper 23, the timer 26 activates the sample drop. Send a start signal. That is, the detector 25 and the timer 26 constitute a sample fall start detector 39. The random signal transmitter 27 that receives this fall start signal randomly transmits a random signal within a preset period of time. Upon receiving this random signal, the minicomputer 18 immediately transmits the first cutter start signal to the cutter automatic control device 28 of the cutter type reduction machine 19, and the cutter automatic control device 28, which receives this signal, operates the cutter 20.
That is, the cutter 20 is caused to run across the width direction of the conveyor 24 of the belt feeder 22 at the tail opening.

In addition, the minicomputer 18 receiving the random signal transmits a cutter start signal (n-1) times every time the sampling (operation) interval calculated as described above elapses, and via the cutter automatic control device 28, The cutter 20 is operated a total of n times for one sample, that is, is caused to cross-travel as described above.

The cutter 20 of the cutter type reduction machine 19 illustrated in the drawing has an intake port 29 at the top and three discharge ports 30, 31, and 32 at the bottom, and the cutter 20 has an intake port 29 at the top and three discharge ports 30, 31, and 32 at the bottom, and the cutter 20 receives the cutter 20 during each cross-travel process. The sample is 3
The sample is divided into equal parts, and during the traveling process, 1/3 of the sample is
The sample is supplied onto a transfer belt conveyor 36 to the subsequent process through a chute 33 that is open and arranged along the running path of the outlet 30 of the cutter 20, and one-third of the sample is transferred to the outlet 30 of the cutter 20. The remaining 1/3
falls from the outlet 31 through the chute 34 and is discarded.

As described above, the sample sampled by the cutter type sampler 4 is further reduced in accordance with the JIS standard, and samples for quality characteristic measurement are collected on the belt conveyor 36 and in the Begin type reduction machine 37. Ru.

By the way, recently in ISO standards, for the purpose of measuring the quality characteristic values of a powder mixture such as iron ore, it is required to sample the powder mixture and further reduce the sample to collect the sample using the cutter method as mentioned above. When carrying out the cutter type reduction method using a reduction machine, the sampling interval (interval) is constant, the sampling amount is equal to or greater than the specified amount, as stipulated in the JIS standard.
In addition to the stipulation that the number of lots collected is 4 or more, a new
The first cross-travel (abbreviated as the first cut) of the cutter 20 in the cutter-type condensing machine 19 illustrated in the figure is based on the sample weight x and the number of sampling times of 4 or more (abbreviated as the number of cuts) n, as described above. A random start within the sampling (operation, cut) interval time calculated by calculation, that is, a random start within the sampling interval time of the first cut, has been added as a regulation. For this reason, even in the JIS standard, sooner or later a random start within the sampling interval time of the first cut will be added to the provisions of the Cutter reduction method.

However, in the cutter type reduction system shown in FIG.
This does not satisfy the above random start.
That is, iron ore is first supplied from an ore ship to hopper 1 using an unloader, and this supply is intermittent, and the ore storage level in hopper 1 fluctuates, so the amount of iron ore cut from hopper 1 to conveyor belt 2 is limited. The amount of the sample flowing through the belt 2 and falling from the tail is not always constant and varies, so the weight of the sample sampled multiple times by the sampler 4 differs for each sampling. Furthermore, since the mixture of fine ore and lump ore is cut out from the hopper 1, it is difficult to cut out a fixed amount, and the falling amount fluctuates. Therefore, a plurality of samples sampled by the sampler 4 from the same incoming ship are each passed through the cutter-type condenser 19.
When performing reduction according to the JIS standard, the sampling interval time for each sample will be different.

Although the sampling interval time for each sample is different in this way, the detector 25, timer 26, and random signal generator that transmits a cutter start signal to the cutter automatic control device 28 of the cutter type reduction machine 19 shown in FIG. 27. The cutter start signal transmitting device 99 consisting of the mini-computer 18 causes the mini-computer 18 to randomly transmit signals within a constant time set in the transmitter 27, regardless of the size of the sampling interval time calculated and determined by the mini-computer 18. The cutter start signal is transmitted, and the random start regulation within the first cut sampling interval time is not satisfied.

In order to satisfy a random start with the cutter start signal transmitting mechanism, for example, the variation range of the weight of each sample by the sampler, or in other words, the variation range of the sampling interval time, is investigated, and a large number of the random signal transmitters 27 are used. The collection interval time determined by the minicomputer 18 is displayed on the display, and the operator sets the display time based on this. It is conceivable to select a random signal transmitter that has been set up and electrically connect the timer 26 and the minicomputer 18 with the selected transmitter, but in this case, an operator is required and labor cannot be saved. Moreover, a large number of transmitters 27 are required, and the equipment cost is high.

On the other hand, the sampler 4 is modified so that the weight of the plurality of samples sampled by the sampler 4 is always constant, for example, by controlling the cross-travel speed, the sampling interval of the cutter type condenser 19 is always kept constant. It is conceivable to try to start randomly by setting the setting time of the random signal transmitter 27 to the above interval time, but since the falling amount of the belt conveyor 2 fluctuates, it is possible to reduce the weight variation between samples, but it is not constant. It is extremely difficult to control the weight.

The present invention was made in view of the above-mentioned circumstances, and is configured to automatically transmit the first cutter start signal to the cutter automatic control device of the cutter type reduction machine at random within the sampling interval time. The present invention provides a cutter start signal transmitting device for a cutter type reduction machine.

That is, the structure of the cutter start signal transmitting device for the cutter type reduction machine of the present invention is as follows.

Equipped with a sampler placed on the belt conveyor tail that conveys a powder mixture of iron ore, etc., and a cutter-type condenser placed on the feeder tail.
After the first sampling with the above sampler, samples are taken every time the conveyed weight reaches a set value, the sample weight is measured for each of these samples, and the sample is collected based on this weight and the number of sampling times with the above cutter type condenser. A cutter start signal is received in the sample collection equipment where an interval is calculated and determined, and the cutter of the cutter-type condensing machine is operated to reduce the sample and collect the sample for quality characteristic measurement according to the number of times of sampling at this interval. The cutter start signal transmission device of the cutter type reduction machine transmits a cutter start signal to the cutter automatic control device of the cutter type reduction machine, which operates the cutter of the cutter type reduction machine to collect a sample. A digital weight measuring device that sends out a digital weight signal, a sample fall start detector that detects the start of sample falling from the feeder and sends out a sample falling start signal, a pulse transmitter, and a digital weight from the weight measuring device. A weight counter that counts signals, and when counting is completed, sends a counting end signal and outputs a weight count value, and a weight counter that counts pulses from a pulse transmitter and automatically outputs this count value when the set maximum count value is reached. a random start counter that, after clearing and restarting counting and receiving a counting end signal from the weight counter, constantly outputs the count value of the pulse until the weight count value of the weight counter is cleared; and the weight counter. The above weight count value is input, and until the weight count value of the weight counter is cleared, it is compared with the count value input from the random start counter, and the count value from the random start counter and the weight count value match. Then, the count value of the random start counter is cleared and a signal to start counting again is output repeatedly, and after the fall start signal is input from the sample fall start detector, the count value from the random start counter and the weight mentioned above are inputted. A first coincidence detector that emits a cutter start signal only when the count value matches the count value, and the pulses from the pulse generator are counted using the cutter start signal of the first coincidence detector as a counting start signal. The weight count value of the weight counter is inputted and compared with the count value input from the interval counter, and if they match, outputs a cutter start signal and outputs the count value of the interval counter. A second coincidence detector outputs a signal to clear and start counting again to the interval counter, and a cutter start signal from the first and second coincidence detectors is counted and when a set value is reached, the weight counter and the interval counter are counted. A cutter start signal transmitting device for a cutter type reduction machine, comprising a clear signal transmitter that transmits a clear signal to a counter.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cutter start signal transmitting device for a cutter type reduction machine according to the present invention will be described in detail below with reference to FIG.

FIG. 2 omits the illustration of the equipment upstream from the hopper 15 in the sample collection equipment of FIG. 1. In FIG. When counting is completed, the weight counter emits a counting end signal 41 and outputs a weight count value 42,42. The measuring device 38 is configured to output z pulses per kg of weight of the sample in the hopper 15 (z pulses/Kg), for example,
For example, z = 1 pulse/Kg, sample weight is 400Kg
In the case of 400 pulses are output and the above counter 40
The counting ends at 400, and a weight count value of 400 is output 42, and the counter 40 outputs a counting end signal 41 when a set time has elapsed from the start of counting.

43 is a pulse transmitter, and the number of pulses transmitted per sec (pulse/sec; transmission frequency) will be described later. 44 is a random start counter that counts the pulses from the pulse generator 43 and calculates the set maximum count value xmax (for example, z=1 pulse/
When xmax = 999) is reached, this count value (999) is automatically cleared (to 0) and counting starts again, and after receiving the counting end signal 41 from the weight counter 40, Above counter 4
The pulse count value m (=0 to 999) is constantly outputted 45 until the weight count value of 0 is cleared.

Reference numeral 46 denotes a first coincidence detector, which receives input 42 of the weight count value of the weight counter 40 and receives an input 45 from the random start counter 44 until the weight count value of this counter 40 is cleared.
The counted value m of the counter 40 is compared with the weight counted value from the counter 40, and if the counted value of the counter 44 and the weight counted value match, the counted value of the start counter 44 is cleared (to 0) and counting starts again. Repeatedly outputting the signal 49 to the counter 44, the sample fall start detector 3
After the fall start signal 47 is input from the counter 9, the cutter start signal 48 is output only when the count value m from the counter 44 and the weight count value (for example, 400) match for the first time.

50 is an interval counter, and the number 1 above is
The pulses from the pulse generator 43 are counted using the cutter start signal 48 of the coincidence detector 46 as a counting start signal, and the counted value is outputted 51. 52
is a second coincidence detector, when the weight counter 40 completes counting, the weight count value m is input 42 and compared with the count value input 51 from the interval counter 50, and if they match, it sends a cutter start signal 53. and interval counter 5
A signal 54 that clears the count value of 0 and starts counting again is output to the interval counter 50.

Here, regarding the pulse transmission speed (frequency) of the pulse transmitter 43, the sample weight is xKg,
Sample feeding speed of belt feeder 22 y=y ₁
(=4Kg/sec) and the number of sampling times n=n ₁ (=5 times). At this time, the sampling time of the cutter-type condensing machine 19 (the operation of the cutter 20) interval time t
is (x/n ₁ y ₁ )=(x/20) sec. For example, when the sample weight x is 400 kg, y ₁ =4 kg/sec, and n ₁ =5 times, the above time t is 20 sec.

Cutter start signals 48 and 5 to the cutter automatic control device 28 of the cutter type reduction machine 19 in FIG.
For example, the cutter start signal transmitting device 100 of the cutter type condensing machine 19 transmits the signal 3 when the sample weight is xKg (=x ₁ ,
_{x 2 , _ _}
For example, if the sample weight x is x ₁ Kg, the weight count value x ₁ is input from the weight counter 40 to the coincidence detectors 46 and 52, so the count value of the interval counter 50 is expressed as t=(x ₁ /n ₁ y ₁ )
In order to transmit the cutter start signal 53 by x ₁ every sec, the pulse transmission speed (frequency) of the pulse transmitter 43 should be (x ₁ /t) = n ₁ y ₁ pulse /
sec. For example, y ₁ = 4Kg/sec, n ₁ = 5
In the case of 20 pulses/sec, it is sufficient.

Further, the random start counter 44 counts the pulses of the frequency (n ₁ y ₁ ) as described above from the pulse generator 43, and also counts the weight count value x ₁ input from the weight counter 40 to the coincidence detector 46. After the input, the weight counter 40 continues to hold the counter 44 until the count value x ₁ is cleared.
It corresponds to the sampling interval time t, which is used as a comparison reference value in the detector 46 to output a signal 49 that clears the counted value of the counter 44 and starts counting again if they match. It is something to do.

In Fig. 2, 55 is a clear signal transmitter;
The cutter start signals 48 and 53 sent from the first and second coincidence detectors 46 and 52 are counted, and when the set value n= _n1 is reached, a clear signal 56 is sent to the weight counter 40 and interval counter 50. do. Note that the random start counter 44 is connected to the cutter start signal transmitting device 10.
Counting of pulses from the pulse generator 43 is started when the main switch is turned on at 0.

The operation of the cutter start signal transmitting device 100 of the cutter type reduction fractionator 19 configured as above will be explained.

Now, after the first sampling by the sampler 4 in Fig. 1, for the convenience of explanation, the sampler 4 will sample each fixed weight twice, for a total of three times. (hereinafter abbreviated as No. 1 sample) is x ₁ Kg, No. 2 sample is x ₂ Kg, and No. 3 sample is x ₃ Kg. The main switch of the cutter start signal transmitting device 100 is turned on at any timing until the No. 1 sample reaches the hopper 15. 7 and cutter automatic control device 8 at the timing when an initial (first time) cutter start signal is manually input. From this main switch, the sample fall start detector 39 shown in FIG.
The time until the signal 7 is transmitted is T _0-1 , and the transmission interval time of the falling start signal 47 of the No. 1 sample and No. 2 sample transmitted by the detector 39 is T _1-2 , No. 2.
Transmission interval time between sample and No. 3 sample is T _2-3
shall be. Further, the _time from when the main switch of the cutter start signal transmitting device 100 is turned on until the weight counter ₄₀ shown in FIG. The transmission interval time of the weight count value of the No. 1 and No. 2 samples and the counting end signal 41 transmitted by the weight counter 40 is set as h _1-2 , and the transmission interval time of the No. 2 and No. 3 samples is set as h _{2- 3} .

_The digital _weighing device 38 _in FIG.
x ₁ , x ₂ , x ₃ pulses are output, and the weight count values of the weight counter 40 become x=x ₁ , x ₂ , x ₃ .

Sample feeding speed y of belt feeder 22 =
y ₁ (Kg/sec), the number of sampling times n=n ₁ =4 times, and the sampling interval time t=x/n ₁ y ₁ =x/Δy ₁ (sec). That is, the interval times t ₁ , t 2 , and t ₃ for sampling No. 1, ₂ , and 3 samples by the cutter-type condenser 19 (operation of the cutter 20) are x ₁ /n ₁ y ₁ , x ₂ /n ₁ y ₁ ,
x ₃ /n ₁ y ₁ . The pulse frequency of the pulse oscillator 43 is n ₁ y ₁ (pulse/sec). Further, the maximum count value of the random start counter 44 is set to 999.

FIG. 3 shows each interval time in the cutter start signal transmitting device under the above conditions, and the output 41 (counting completion signal) of the weight counter 40.
2 (weight count value), output 4 of fall start detector 39
7 (drop start signal), output status of output 45 (count value) of random start counter 44, input 42 (weight count value) and output 48 (cutter start signal) of coincidence detector 46, coincidence detector 52 is a time chart showing the output timing of the output 53 (cutter start signal).

As described above, the cutter start signal transmitting device 10
The main switch of 0 is cutter type sampler 4
The cutter start signal is turned on at the timing when the initial (first) cutter start signal is manually input to the start signal transmitter 7 and the cutter automatic control device 8. This is an arbitrary timing from when the integrated value of the transmitter 7 reaches the set value for the first time after being detected by the No. 1 sample at the hopper 15 to the belt feeder 22. , said time h _0-1 and
T _0-1 varies randomly.

In a situation where the flow rate (Kg/sec) of iron ore on the conveyor belt 2 in Figures 1 and 2 fluctuates as described above and the amount of iron ore falling from the tail of the belt 2 fluctuates, after the first sampling, the Furthermore, since the sampler 4 samples a plurality of times, for example twice as described above, the sampling interval time by the sampler 4 varies randomly. Since the transport and supply time of each sample to the hopper 15 and the belt feeder 22 is almost constant, the output 42 of the weight count value from the weight counter 40 and the transmission interval time of the counting completion signal 41 vary randomly. , the transmission interval time of the sample fall start signal 47 of the sample fall start detector 39 varies randomly. That is, the transmission interval times h _1-2 and h _2-3 are
h _1-2 ≠ h _2-3 , and the transmission interval time T _1-2 ,
T _2-3 is such that T _1-2 ≠T _2-3 .

Furthermore, since the flow rate of the conveyor belt 2 fluctuates,
The weight of the sample sampled by the sampler 4 varies. Since the sample weight varies, the collection interval time for each sample t=
As x/n ₁ y ₁ (sec) varies, the weight count values input from the weight counter 40 to the first and second coincidence detectors 46 and 52 vary randomly for each sample.

That is, the sample weights x ₁ , x ₂ , x ₃ Kg are x ₁ ≠ x ₂
≠x ₃ and the sampling interval time t ₁ ,
t ₂ , t ₃ (sec) are t ₁ ≠ t ₂ ≠ t ₃ , and the weight count value
x ₁ , x ₂ , x ₃ (pulses) are x ₁ ≠x ₂ ≠x ₃ .

Next, cutter type condenser 1 for No. 1 sample.
The cutter start signal transmission status of the cutter start signal transmission device 100 of No. 9 will be explained.

After a certain time T _0-1 has elapsed after the main switch of the transmitter 100 is turned on, the detector 39 transmits a falling start signal 47 for the No. 1 sample.
Before this signal 47 is transmitted, specifically, before the time that is the sum of the transfer time Δt ₂ of the feeder 22 and the transfer time Δt ₃ from the hopper 15 to the feeder 22,
The weight counter 40 sends the digital weight signal 5 of the No. 1 sample to the random start counter 44.
7, and the weight count value x ₁ of the No. 1 sample is output to the first and second coincidence detectors 46 and 52.

As a result, the weight counter 40 is
The random start counter 44 receives the count end signal 41 from the counter 40, and counts the pulses from the pulse generator 43 by the detector 46, which receives the weight count value x ₁ from the counter 40, and calculates the set maximum count value. xmax automatically when it reaches 999, for example,
Clear this value xmax and start counting again From the counter, count the pulses from the transmitter 43 with the above weight count value x ₁ as the maximum count value, and when the above count value x ₁ is reached, clear this value x ₁ The counter then starts counting again. That is, the counter takes the weight count value x ₁ corresponding to the sampling interval time t ₁ of the No. 1 sample as the maximum value, and when this maximum value x ₁ is reached, this value x ₁ is cleared and counting starts again.

The random start counter 44 has a form in which the maximum count value shifts from the counter with the set maximum count value xmax to the counter with the weight count value _x1 when the counter 40 transmits the signal 41 and the count value _x1 . The following form occurs depending on the magnitude of the count value m ₁ and the count value x ₁ input to the coincidence detector 46.

That is, if m ₁ > x ₁ , the counter 44 calculates xmax
If m ₁ < x ₁ after counting up to (x ₁ - m ₁ ), if m ₁ = x ₁ , at that point, the counter becomes a repetition counter of count value x ₁ .

Then, the falling start signal 47 of the No. 1 sample is the first
For example, if the count value of the random start counter 44 is input at m ₂ as shown in FIG. 3, the counter 44 counts (x ₁ - m ₂ ) pulses, and the above When the count value input from the counter 44 reaches the input weight count value x ₁ for the first time after inputting the signal 47, the coincidence detector 46 outputs the first cutter start signal 48 for the No. 1 sample. It is output to the cutter automatic control device 28, interval counter 50, and clear signal transmitter 55.

Upon receiving this signal 48, the control device 28 immediately causes the cutter 20 of the cutter type fractionator 19 to travel across the width of the conveyor 24 of the belt feeder 22 at the tail drop. That is, the first cut for the No. 1 sample is automatically executed.

Now, the counted value m ₂ of the random start counter 44 when the fall start signal 47 of the No. 1 sample is input to the first coincidence detector 46 is the time h _0-1
and T _0-1 , which varies depending on the weight count value x ₁ . After the flow rate of iron ore is detected by the scale 6, the main switch of the device 100 is turned on at any timing until the integrated value of the transmitter 7 reaches the set value for the first time, and the hopper 1 of the No. 1 sample is turned on.
5 and the feeder 22 are almost constant, the time T _0-1 from when the main switch of the apparatus 100 is turned on until the detector 39 sends the falling start signal 47 for the No. 1 sample, The time h _0-1 from when the counter 40 is turned on until the counter 40 transmits the weight count value x ₁ and the signal 41 varies randomly. Furthermore, since the flow rate of the conveyor belt 2 varies, the weight of the sample sampled by the sampler 4 varies. Since the sample weight changes, the weight count value x ₁ changes.
Therefore, the count value m ₂ varies randomly. In this way, since the count value _m2 of the counter 44 when the signal 47 is input to the detector 46 is randomized, the first cutter start signal 48 for the No. 1 sample is generated within the sampling interval time _t1 . will be sent randomly. In other words, the random start of the first cut of the cutter 20 of the cutter type reduction machine 19 at the sampling interval time _t1 is satisfied.

Furthermore, the interval counter 50 which receives the signal 48 starts counting pulses from the pulse transmitter 43, and the count value of the counter 50, that is, the output 51 becomes x ₁ , and the weight count value of the coincidence detector 52 becomes x1.
x ₁ , this detector 52 sends a cutter start signal 53 to the device 28 and the transmitter 55.
It also outputs to the counter 50 a signal 54 that clears the count value x ₁ of the counter 50 and starts counting again.

The above operation after the counter 50 starts counting is executed three times, and one cutter start signal 48 and three cutter start signals 53 are sent to the transmitter 55.
Immediately upon input of , the transmitter 55 outputs a clear signal 56 to the weight counter 40 and the interval counter 50. When this signal 56 is received, the weight count value x ₁ of the counter 40 becomes 0, and the count value of the counter 50 also becomes 0. Furthermore, when the weight count value x ₁ of the counter 40 becomes 0 (cleared), the random start counter 44 maximizes the set count value xmax from the counter controlled by the count value x ₁ of the detector 46. Returns to a counter that repeats counting as a value.

Next, the transmission status of the cutter start signal 48 for the No. 2 sample (No. 3 sample) will be explained.

Regarding the No. 1 (No. 2) sample, the time elapsed after the weight counter 40 sent outputs 41 and 42.
After h _1-2 and h _2-3 , the counting end signal 41 is sent from the weight counter 40 to the random start counter 44.
Then, the weight count values x ₂ and x ₃ are output to the first and second coincidence detectors 46 and 52 . The count value m ₁ of the random start counter 44 at this point,
If m ₅ is m ₃ > x ₂ (m ₅ > x ₃ ), count up to xmax; if m ₃ < x ₂ (m ₅ < x ₃ ), x ₂ − m ₃ (x ₃ − _{m 5} )
After pulse counting, if m ₃ =x ₂ (m ₅ -x ₃ ), at that point the counter 44 becomes a counter that repeatedly counts weight counts x ₂ and x ₃ as maximum values.
In this manner, while the counter 44 is repeating the counting of the weight count values x ₂ and x ₃ for the collection interval times t ₂ and t ₃ of the No. 2 (No. 3) sample, that is, the No. 1 (No. 3) sample. 2) When time T _1-2 and T _2-3 have elapsed since the transmission of the sample fall start signal 47, the sample fall detector 39 detects the fall start signal 47 of the No. 2 (No. 3) sample from the first Output to coincidence detector 46. Random start counter 4 at this point
If the count values of 4 are m ₄ and m ₆ , x ₂ − _{m 4} (x ₃ −
m ₆ ) After pulse counting, output 45 of counter 44
and the weight count values x ₂ and x ₃ of the detector 46 match, and the first coincidence detector 46 detects the cutter start signal 4
8, cutter automatic control device 28, counter 5
0, output to the clear signal transmitter 55.

Now, as mentioned above, at the time when the sample drop start signal 47 for the No. 2 (No. 3) sample is sent, the random start counter 44 indicates the sampling interval time t ₂ , t ₃ for the No. 2 (No. 3) sample. The weight count value x ₂ , x ₃ corresponding to is set as the maximum value, and when this maximum count value is reached, the count value x ₂ , x ₃ is cleared and counting starts again.

Then, m 4 , m 6 which are the output 45 of the random start counter 44 when the falling start signal 47 of the No. 2 (No. 3) sample is input to the first coincidence detector ₄₆ and are the counted _values are the transmission interval times h _1-2 , h _2-3 , the transmission interval times T _1-2 , T _2-3 ,
It varies depending on the weight count values x ₂ and x ₃ .

As mentioned above, when the flow rate (Kg/sec) of iron ore on the conveyor belt 2 fluctuates and the amount of iron ore falling from the tail of the belt 2 fluctuates, after the first and second sampling, when a predetermined weight is conveyed. Since sampler 4 performs the second and third sampling, No. 1, 2 and No. 1 by sampler 4.
The sampling interval time for two or three samples varies. Since the time for transporting and supplying the sample to the hopper 15 and the feeder 22 is approximately constant, the above-mentioned times h _1-2 , h _2-3 and T _1-2 , T _2-3 also vary.
Also, since the flow rate of the conveyor belt 2 fluctuates, No. 2 sampled by the sampler 4,
3 Sample weights vary. Since the sample weight varies, the weight count values x ₂ and x ₃ vary. Therefore, the count values m ₄ and m ₆ vary randomly.

In this way, the count values m ₄ and m ₆ of the counter 44 when the signal 47 is input to the detector 46 are randomized, so the first
The cutter start signal 48 for the second time is randomly transmitted within the sampling interval times t ₂ and t ₃ . That is, the cutter 2 of the cutter type reduction fractionator 19
A random start at sampling interval times t ₂ and t ₃ of the first cut of 0 is satisfied.

As detailed above, the belt conveyor on which the sampler is arranged makes effective use of the fluctuating flow rate of the conveyed powder mixture of iron ore, etc., and automatically sends the first cutter start signal at the sampling interval. It is configured to send a message to the cutter automatic control device of the cutter type reduction machine at random within the time.
According to the cutter start signal transmitting device of the cutter type reduction machine of the present invention, a random start is automatically executed within the sampling interval time of the first cut, so that the cutter type reduction equipment (sample collection equipment) is valuable. is extremely high.

[Brief explanation of drawings]

Fig. 1 is a schematic explanatory diagram of a cutter type reduction equipment (sample collection equipment) that satisfies JIS standards, and Fig. 2 is an explanatory diagram of an embodiment of the cutter start signal transmitting device of the cutter type reduction machine of the present invention. FIG. 3 is a time chart showing an example of signal input and output conditions of each component of the cutter start signal transmitting device shown in FIG. 1...Hopper, 2...Unloading belt conveyor, 3...Tail, 4...Cutter type sampler, 5...Cutter, 6...Conveyor scale, 7...Cutter start signal transmitter, 8...
Cutter automatic control device, 9, 10, 11...Belt conveyor, 12...Sieving device, 13...Crushing device, 14...Belt conveyor, 15...Hopper, 16...Scale, 17...A/D conversion vessel,
18...Mini computer (mini computer), 19...
...Cutter type reduction machine, 20...Cutter, 21...
... Skip elevator, 22 ... Belt feeder, 23 ... Hopper, 24 ... Belt conveyor, 25 ... Conveyor operation start detector, 26
...Timer, 27...Random signal generator, 2
8... Cutter automatic control device, 29... Receiving port,
30, 31, 32...Dispensing port, 33, 34...Chute, 35...Chute, 36...Belt conveyor, 37...Begin type condenser, 38...Digital weight measuring device, 39...Sample fall start Detector, 40... Weight counter, 41... Counting end signal, 42... Output (weight count value), 43...
Pulse transmitter, 44...Random start counter, 45...Input (count value), 46...First coincidence detector, 47...Fall start signal, 48...Cutter start signal, 49...Signal, 50...Interval counter, 51...Output (count value),
52...Second coincidence detector, 53...Cutter start signal, 54...Signal, 55...Clear signal transmitter, 56...Clear signal, 57...Digital weight signal, 99...Cutter start Signal transmitting device, 100... Cutter start signal transmitting device.

Claims (1)

[Scope of Claims] 1. A sampler placed on the tail of a belt conveyor that conveys a powder mixture of iron ore, etc., and a cutter-type condenser placed on the tail of the feeder, and after the first sampling with the sampler, the conveyed weight Each time the sample reaches a set value, the sample weight is measured. Based on this weight and the number of sampling times in the cutter type condensing machine, a sampling interval is calculated and determined, and at this interval, the number of samplings described above is determined. ,
This is a sample collection equipment that operates a cutter of a cutter-type condensing machine to reduce the above-mentioned sample and collects a sample for measuring quality characteristics.The cutter of the cutter-type condenser is operated every time a cutter start signal is received. A digital weight measuring device that transmits the sample weight as a digital weight signal in a cutter start signal transmitting device of a cutter type fractionator that transmits a cutter start signal to a cutter automatic control device of a cutter type fractionator that collects a sample. a sample fall start detector that detects the start of sample fall from the feeder and sends out a sample fall start signal; a pulse transmitter that counts the digital weight signal from the weight measuring device; and when counting is complete, starts counting. A weight counter that sends an end signal and outputs a weight count value, and a pulse generator that counts pulses from a pulse transmitter and automatically clears this count value and starts counting again when the set maximum count value is reached. a random start counter that constantly outputs the count value of the pulses until the weight count value of the weight counter is cleared after receiving a count end signal from the weight counter; Until the weight count value of the weight counter is cleared, it is compared with the count value input from the random start counter, and when the count value from the random start counter and the weight count value match, the count value of the random start counter is cleared. Then, after the sample drop start signal is inputted from the sample drop start detector, only when the counted value from the random start counter matches the weight counted value, a first coincidence detector that transmits a cutter start signal; and an interval counter that counts pulses from the pulse generator and outputs a counted value using the cutter start signal of the first coincidence detector as a counting start signal. Then, the weight count value of the above weight counter is input,
a second coincidence detector that compares the count value input from the interval counter and outputs a cutter start signal if they match, and also outputs a signal to the interval counter that clears the count value of the interval counter and starts counting again; A cutter comprising: a clear signal transmitter that counts the cutter start signals from the first and second coincidence detectors and, when a set value is reached, transmits a clear signal to the weight counter and the interval counter. Cutter start signal transmitter for type reduction machine.