JPH0692926B2 - Velocity control method of box sampler for sampling - Google Patents

Description

Detailed Description of the Invention

[Industrial applications]

The present invention relates to a speed control method for a box sampler for sampling, and in particular, for sampling a sample from a steel raw material being transported by a transportation means such as a belt conveyor, for example, an iron ore or a sintered ore, the box sampler is used. The present invention relates to an improvement in the speed control method of a box sampler for sampling, which is suitable for use in sampling a sample of the iron and steel raw material using.

[Prior art]

Sampling equipment for sampling iron ore, which is a raw material for steel, or sinter, begins with taking samples from these raw materials, and then measures particle size of the raw materials, strength measurement, adjustment of analytical samples or reduction. A series of operations such as sample collection are automatically performed. By the way, it can be said that important items in the sampling performed by the sampling facility are (1) that the sampled sample is representative, and (2) that the sampling amount is always constant. Here, among various types of sampling equipment, a configuration example of a sampling equipment using a box sampler, which is a typical raw material sampling means, is shown in FIG. 5, and a sampling method using this box sampler will be described. In the figure, reference numeral 10 is a box sampler, and this box sampler 10 horizontally traverses the lower direction of the raw material 12 dropping position of a belt conveyor 14 for transporting the raw material 12 in a horizontal direction, and samples the raw material 12 It is supposed to be collected. This box sampler 10 is the belt conveyor
When the raw material 12 of 14 passes through the falling position downward (reference numeral 10 in the figure)
A sample of the raw material 12 is sampled and stored in the sampling box 16 (at the position indicated by A), and after the transfer is completed (reference numeral 10B in the figure).
The sample is supplied to the sample transport belt conveyor 20 by opening the box opening / closing lid 18 provided at the lower end of the sampling box 16). In the figure, reference numeral 22 is a moving wheel of the box sampler 10, 24 is a lid fixing cam for fixing the box opening / closing lid 18, 26 is a drive device for driving the sampling box 16 via a drive chain 28, Reference numeral 30 is a discharge shed for discharging the raw material 12 dropped from the raw material transport belt conveyor 14, 32 is a discharge belt conveyor for transporting the discharged raw material 12, and 34 is a box sampler as indicated by reference numeral 10C in the figure. When 10 is returned to the original position before the movement, an ore sink recovery queue for recovering the ore deposit from the same, 36 is a belt conveyor for discharging this ore deposit, and 38 is a sample discharge short. The method of collecting a sample using the box sampler 10 having the above-mentioned configuration is specified in the Japanese Industrial Standard (JIS) as follows. In this case, the positional relationship of the box sampler 10 in the vicinity of the dropping position where the raw material 12 drops from the belt conveyor 14 for transporting the raw material is schematically shown in FIG. 6 and will be described based on this figure. Reference numeral 40 in the figure denotes belt wear for detecting the instantaneous transport amount Q of the raw material 12. As shown in the figure, when the width of the raw material 12 accumulated on the belt conveyor 14 for transporting the raw material is Bw (hereinafter referred to as the stagnant width), this is because the sampling box 16 collects a sample from the raw material 12. The time t for passing the stagnant width Bw is expressed by the following equation (1), where Cw is the width (cutting width) of the sampling box 16 in the moving direction and Vs is the moving speed of the box sampler 10. t = (Bw + Cw) / Vs (1) Further, the amount (sample amount) q of the sample collected while the sampling box 16 is passing under the drop position is accumulated on the belt conveyor 14 and transported. If the instantaneous transport amount of the raw material 12 is Q, it is expressed by the following equation (2). q = Qt (Cw / Bw) (2) Therefore, the amount q to be collected from the equations (1) and (2) is as shown in the following equation (3). q = {(Q · Cw) / Vs} · (1 + Cw / Bw) (3) It is difficult to measure the change in the accretion width Bw of the raw material 12 for the Cw / Bw term in the equation (3). , Or this change expression of the accumulation width Bw
Since it is difficult to calculate Bw = f (Q), Bw = f (Q) can be neglected. Therefore, normally, the equation (3) is simplified and treated in the form of the following equation (4). q = (Q · Cw) / Vs (4) From the equation (4), in order to keep the inoculum q constant, Cw / q is considered to be constant and the moving speed Vs is calculated by the following equation (5). The box sampler 10 may be controlled accordingly. Vs = K · Q (5) However, K = Cw / q is a constant. From the equation (5), it can be said that the moving speed Vs may be controlled according to the instantaneous transportation amount Q. On the other hand, when the sampling box 16 passes through the falling raw material 12 from the belt conveyor 14 for sampling, the moving speed during the passing must be constant. This is because changing the speed during the passage of the sampling box 16 is a matter that should be prohibited in order to ensure the representativeness of the sample. Therefore, in order to secure a fixed amount q of the sample, sampling must be performed at a constant rate every time.

[Problems to be Solved by the Invention]

However, if the control of the moving speed Vs of the box sampler is performed based on the above equation (5), the control of the moving speed Vs will be rough because of the following reasons. (1) The instantaneous transport amount Q changes finely even during a short passage time during which the box sampler 10 moves and samples are taken from the raw material 12 in the sampling box 16. Therefore, according to the equation (5), the box sampler 10 cannot be moved at a constant speed as described above. In equations (2) and (5), Cw / Bw in equation (3) is ignored, and highly accurate control cannot be performed. (3) A detection error usually exists in the detection means (for example, the belt wear 40 in FIG. 6) that detects the instantaneous transport amount Q. (4) A bias phenomenon may occur in the belt conveyor 14 for transporting raw materials. (5) An error in control accuracy may occur in the device that controls the speed of the box sampler 10. The error of the moving speed due to the causes of (1) to (5) is ± 5k with respect to the sampling amount q = 30kg in the concrete measurement result.
There was an error of g. If such an error occurs, it becomes impossible to obtain an accurate measurement value in each measurement such as particle size measurement and strength measurement after the sampling step in sampling. Therefore, in the above-mentioned conventional method, if the moving speed Vs is controlled, the box sampler cannot be moved stably at a constant speed, and the sample to be sampled becomes unrepresentative, and the sampled amount q is always constant. However, there is a problem in that it becomes difficult to use the same method, which in turn causes variations and deterioration in analysis accuracy. As a technique related to the present invention, JP-A-57-122321 proposes a sample weight measuring method in a sampling facility. In this weight measuring method, the sample sampled by the cutter sampler is used for a predetermined time from the start of cutting of the cutter of the cutter sampler for the raw material flow rate detected by the conveyor scale without using a sample weight measuring device such as a Hopper scale. The weight of the sample to be sampled is measured with the same degree of measurement accuracy as that of the conventional Hopper scale by starting the integration of the above and then integrating for a predetermined time. However, this measuring method is a technique in which the Hopper scale is replaced with a conveyor scale to measure the sampling weight, and the sampling amount q is always kept constant by coping with the above (1) to (5). This is not a technique that is used in this way and cannot solve the above problems.

[Object of the Invention]

The present invention has been made to solve the above-mentioned conventional problems, and aims to improve the representativeness of a sample to be sampled and to accurately sample a box sampler for sample collection. An object of the present invention is to provide a speed control method.

[Means for Solving the Problems]

The present invention, in the method for controlling the speed of a box sampler for sampling, in order to sample the measurement object being transported by a predetermined transportation means, when the sample is sampled from the measurement object using the box sampler, the measurement is performed. Detect the transport amount of the target and use either the quantitative integration method or the constant time integration method in which the measurement target object to be integrated and the sampling raw material are in the same range, depending on the sampling conditions. The moving speed of the box sampler is calculated, and the calculated moving speed is corrected based on the past results of the error and the steady-state error having a strong correlation with the transportation amount of the measurement object, and the box sampler is fixed according to the corrected moving speed. The object is achieved by moving the sample at a speed to collect the sample.

[Action]

The principle of the present invention will be described below. As an object to be measured, an iron and steel raw material (iron ore, sinter, etc.) being transported by a belt conveyor will be described as an example with reference to FIG. As shown in FIG. 1, a belt conveyor for transporting raw materials
While the raw material 12 is being transported on the top 14, the instantaneous transport amount Q of the raw material 12 fluctuates finely with time, and in the above equation (5), the moving speed Vs of the box sampler 10 is calculated from the transport amount Q in question. I can't get it accurately. Therefore, in the present invention, in order to eliminate the fluctuation of the instantaneous transport amount Q, the instantaneous transport amount Q is averaged for a predetermined time t ₀ → t as shown in the following equation (6). However, K is a constant, t ₀ is a start timing, and t is an integration completion timing (time). In this case, a value obtained by integrating the instantaneous transport amount Q from t ₀ to t is set as a predetermined constant value C as shown in the following formula (7), and the integral of the instantaneous transport amount Q is calculated as the constant value C as shown in the following formula (8). The moving speed Vs is determined by the time (t−t ₀ ) required to reach Vs = K · {C / (t−t ₀ )} (8) Since the time (t−t ₀ ) is the time for integrating the instantaneous transport amount Q, this time is hereinafter referred to as the integration time (t -T ₀ ). Then, the integration time (t−t ₀ ) and the time for the box sampler 10 to pass below the falling position of the raw material 12 (sampler moving time) are made the same, and the raw material to be integrated (the instantaneous transport amount Q is detected (6) In order to make the raw material 12) to be calculated by the equation the same as the sample (raw material 12 collected by the Box Sampler), the integration time is determined as follows. That is, assuming that the moving distance of the box sampler 10 is the width l ₂ of the belt conveyor 14 for transporting the raw material, the moving speed Vs is given by the following equation (9). Vs = l ₂ / (t−t ₀ ) ... (9) Accordingly, from the equations (9) and (8), the constant value C is set as the following equation (10), and the equation (10) is obtained. Then, the integration completion timing t is determined from the equation (7) and the moving speed Vs may be obtained using this timing t. C = l ₂ / K (10) That is, when the above equations (9) to (10) are rearranged, first, the instantaneous transport amount is reached until the integration time (t−t ₀ ) in which the following equation (11) is established. Integrate Q. Then, by the time t ₂ when the expression (11) is established, (9)
From the equation, the moving speed Vs is obtained with t = t ₂ . Further, the start timing t ₀ can be considered to be usually t ₀ = 0. In the present invention, when the quantitative integration method is used, the target material and the collected sample are the same as described above, so that the representativeness of the collected sample can be secured. The method of integrating the instantaneous transport amount Q as described above and obtaining the moving speed Vs based on the integration time (t−t ₀ ) until the integrated value reaches a predetermined constant value is called a quantitative integration method. However, when the moving speed Vs is obtained by the above quantitative integration method, at the integration time t-t ₀ , the sampling condition, for example, the detector of the instantaneous transportation amount Q (beltwear 40 in the figure) to the belt conveyor 14 is changed. Distance to material drop point
₁ and the velocity V _{B of the} belt conveyor 14
Due to the restriction of 2), when the distance ₁ is short, the integration time (t−t ₀ ) cannot be made sufficiently long. t−t ₀ ≦ ₁ / (V _B −τ) (12) where τ is a margin time including the start warm-up time of the box sampler. This equation (12) is (6) until the raw material 12 at the beginning of the integration reaches the raw material dropping position (indicated by the symbol End) at the end of the belt conveyor 14 during the integration of the equation (6). The integration of the equation must be completed and the integration time (t
-T ₀ ) means that there is a constraint. This restriction is that, for example, when the instantaneous transportation amount Q is small, when the sufficient distance ₁ cannot be taken, and when the speed is high, the conditions can occur due to changes in the sampling conditions from the raw material. In the case where such a constraint occurs, the maximum integration time (hereinafter referred to as the maximum integration time) t ₁ that can be taken within the constraint of the expression (12) is as shown in the following expression (13). t ₁ = ( ₁ / V _B ) −τ (13) Note that in this case, the start timing t ₀ = 0. Therefore, in the case where the integration time is restricted as described above, it is possible by integrating the instantaneous transport amount Q for the integration maximum time t ₁ to obtain the moving speed Vs of the box sampler 10 by the equation (6). The moving speed Vs can be accurately obtained within the range. A method of obtaining the moving speed Vs in this way is called a constant time integration method. From the above, using either the quantitative integration method or the constant time integration method that makes the material to be integrated and the sample to be collected in the same range, depending on the sampling conditions, from the detected transport amount to the moving speed Vs. Is calculated, the moving speed Vs can be calculated by coping with a small change in the instantaneous transport amount Q in a short range during the transit time of the box sampler. in this case,
Since the raw material to be integrated and the sample to be collected are matched, a certain amount of sample can be sampled accurately while ensuring the representativeness of the sample to be collected. Further, in the moving velocity Vs obtained by the quantitative integration method or the constant time integration method as described above, an error having a strong correlation with the instantaneous transport amount Q and a steady error having no correlation with the instantaneous transport amount Q. There is an error. Therefore, the optimum moving speed of the box sampler can be calculated by correcting the calculated moving speed Vs based on the past results of the error having a strong correlation with the raw material transportation amount and the steady-state error. The present invention has been made from the above point of view, and according to the present invention, it is possible to secure the sampling representativeness of the sample collected by the box sampler, and to make the sample collection amount constant with good punctual accuracy. Therefore, accurate measurement values can be obtained in particle size measurement, strength measurement, etc. in sampling equipment. Further, since accurate raw material measurement values are obtained in this way, it is possible to improve all of product quality, operational efficiency, economical efficiency and the like.

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this embodiment, as shown in FIG. 1, with respect to the raw material 12 transported on the belt conveyor 14 for transporting the raw material, the box sampler is provided below the dropping position of the raw material 12 at the end in the transport direction of the belt conveyor 14. When the sample is sampled by 10, the weight (hereinafter referred to as sampled amount) q of the sample sampled by the Box Sampler 10 is to maintain the representativeness of the sample and to keep it constant. A speed calculation control device 42, a weighing device 44, a speed control device 46, and a display device.
With 48 and. The belt wear 40 is provided at a position at a distance ₁ from the end of the belt conveyor 14 in the transport direction (reference numeral End) in the direction opposite to the transport direction, and the width Bw in the direction perpendicular to the transport direction of the raw material 12 at that position. Is used to detect the instantaneous transport amount Q. The speed calculation control device 42 uses the value of the instantaneous transport amount Q of the raw material 12 detected by the belt wear 40 and the measured value q _{1 of the} sample taken by the measuring device 44 to determine the bots sampler 10
The optimum moving speed Vs at which the sampled amount q is always constant is calculated. The weighing device 44 is provided in a sampling facility (not shown), and weighs the sample collected by the sampling box 16 of the box sampler 10,
This measured value q ₁ is input to the speed calculation control device 42. The speed controller 46 operates the box sampler 10 according to the optimum moving speed Vs obtained by the speed arithmetic controller 42.
Drive device for the box sampler 10 to move the
It controls the drive of 50. The speed control device 46
A well-known AC variable speed controller such as an inverter can be used for the. An alternating current motor can be used as the driving device 50. The display device 48 displays the deviation Δq (= q−q ₁ ) of the measured weight value q ₁ with respect to the target sampling amount q, for example, on a cathode ray tube (CRT) screen, and guarantees quality during operation. Contribute to. Next, the operation of the embodiment will be described. The calculation of the moving speed Vs of the box sampler 10 performed at 42 by the speed calculation control device according to the embodiment is described in (6) to (1) above.
3), but specifically, it is executed for each sampling batch of the box sampler 10 according to the flow chart shown in FIG. That is, first, in step 110, a sample collection start command is input, and in step 120, the instantaneous transport amount Q from the belt wear 40 is input.
Capture the measurement value of. Next, at step 130, the integral calculation of the instantaneous transport amount Q To start. Next, at step 140, it is determined whether the integration completion time (timing) t is equal to the maximum integration time t ₁ shown in the above equation (13). The time t
Is equal to or less than the maximum integration time t ₁ , the calculation by the quantitative integration method is executed in steps 150 and 160, while if equal, the calculation by the constant time integration method is executed in step 170. In this step 150, it is judged whether or not the result of integrating the instantaneous transport amount Q has the relation of the above-mentioned expression (11). If the result of the judgment is no, the process returns to step 130 and the integral calculation is executed again. . Therefore, the integral of the instantaneous transport quantity Q is calculated in step 130.
Iteratively repeats from 150 to 150, the integral calculation is completed at time t ₂ when the above condition (11) is established, and the process proceeds to step 160. In step 160, the above equation (9) is used, and the moving speed Vs is determined by calculation with the time t = t _{2 in} this equation. The calculation executed in each of the steps 130 to 160 as described above is the calculation by the quantitative integration method. On the other hand, if the determination result of step 140 is positive and the maximum integration time t
_When the integral completion time t = t ₁ is reached without reaching the integral value l ₂ / K of the instantaneous transport amount Q within ₁ , the process proceeds to step 170.
In step 170, the integration is completed at the maximum integration time t ₁ , and the moving speed Vs is determined by calculation using the above equation (6) and the time t = t ₁ in the equation (6). In this way, in step 170, the moving time Vs is obtained by the constant time integration method. By obtaining the moving speed Vs in these steps 160 and 170, when the box sampler 10 passes below the raw material dropping position of the belt conveyor 14 for sampling, the instantaneous transport amount Q It is possible to obtain the moving speed Vs that is not influenced by the change even if the change is small. Also, at step 160,
The raw material to be integrated and the collected sample are made to coincide with each other to improve the accuracy. Next, as described above, in order to add the error correction based on the actual result of the deviation Δq up to the current batch to the obtained moving speed Vs, the process proceeds to step 180 and the calculation of the following equation (14) is performed, The moving speed Vs (i) of the i-th stitch is calculated. here, Is an error correction coefficient of the first batch having a correlation with the change in the instantaneous transport amount Q, and is inversely proportional to the change in the instantaneous transport amount Q.
It is the product of the reciprocal of ▼. This average value ▲
Values of ▼ are 160 or 1 respectively.
Can be obtained in 70 arithmetic steps (step 160
A, 170A). or, Is a correction coefficient for the i-th batch for a stationary error having no correlation with the instantaneous transport amount Q. Furthermore, a and b are these correction values. In addition to being a weighting coefficient that determines the degree of effect, a constant K for converting the instantaneous transport amount Q shown in the above equation (5) into the moving speed Vs is provided. The calculation result of step 180 is the moving speed in step 190.
It is output to the speed control device 46 as a command of Vs (i). Since the speed control device 46 drives the drive device 50 based on this moving speed Vs (i), the box sampler 10 moves at the moving speed.
While moving at a constant velocity of Vs (i), the i-th batch sample is taken. Weighing device 44 the weight value q ₁ performance of sample taken in step 200
Then, in step 210, a deviation Δq between the target sampling amount q of the sample at the i-th batch and the measured value q ₁ is obtained, and this deviation is calculated as the actual deviation Δq in the sampling at the i-th batch.
(I). Then it flows to steps 220 and 240. In this step 220, the actual result deviation Δq (i)
Absolute value as compared with the deviation q ₂ allowed the result that the absolute value of the comparison | Δq (i) | as long as greater than the deviation value q _2, the routine proceeds to step 230, the display device 48 The actual deviation Δq (i) is displayed and the actual deviation Δ
Make the q (i) display blink on the CRT to give an alarm. Also, the absolute value | Δ
When q (i) | is less than or equal to the allowable deviation q ₂ , the actual deviation Δq
Display (i) on the CRT in a normal state. In this way, it is possible to confirm the suitability of the collection amount of the box sampler, which can contribute to quality assurance management. On the other hand, after the calculation of step 210, the process also proceeds to step 240 to learn the error up to the i-th batch of the previous time, and the next (i +
1) The moving speed Vs (i + 1) at the cross stitch is calculated as (1)
4) Each error correction coefficient because it is calculated by the formula Is calculated based on the following equations (15) and (16). However, α is a predetermined calculation coefficient. Where the correction factor Is an error correction value that has a strong correlation with the average value ▲ ▼ of the instantaneous transportation amount Q, and therefore, in the expression (15), a value Δq obtained by multiplying the actual result deviation Δq (i) by the average value ▲ ▼.
(I) The exponential averaging of ▲ ▼ is performed to make corrections based on past results. Like this (1
Corrected value by exponential averaging of formula 5) Since Cw / Bw is neglected in the equation (3), the error that has occurred can be eliminated. That is, this
Regarding Cw / Bw, it can be regarded as Bw = f (Q), and Bw and Q tend to be proportional (Bw∝Q). Therefore, the actual deviation Δq (i) is the average value from the formula (3) ▲ ▼ Is inversely proportional to. Therefore, the actual deviation Δq (i) ・ ▲
By the exponential averaging of ▼, the error correction coefficient of the i + 1th batch Is calculated and multiplied by the reciprocal 1 / Q (i) of the instantaneous transport amount Q for each processing batch of the step 180. Further, in this step 240, the exponential averaging operation for the actual deviation Δq (i) is performed as in the following equation (16) to perform the steady-state error correction having no correlation with anything. However, β is a predetermined calculation coefficient. In this way, since past performance errors can be learned by equations (14) to (16) and error tendency management can be performed, it is possible to accurately correct errors by coping with changes in error tendency. Therefore, the controllability can be improved by correcting the steady-state error such as the detection error of the belt wear 40, the deviation phenomenon of the belt conveyor 14 for transporting the raw material, the control accuracy error of the speed control device 46, and the like. As described above, each correction coefficient By performing the correction using, the error correction based on the past results can be reflected in the calculation of the moving speed Vs at the time of the next (i + 1) th batch sampling, and the moving speed Vs can be calculated more accurately. can do. The processing of step 240 is completed, and the calculation of the moving speed Vs at the i-th batch is completed. Next, according to the method of the present invention, regarding the example of the operation effect when the speed of the box sampler of the sampling device is controlled,
An explanation will be given with reference to the drawings in comparison with the case of the method (conventional method) not using the present invention. In this case, the raw material to be measured is sinter for charging the blast furnace. First, FIG. 3 shows the average value of the sampled amount and the fluctuation range of the sampled amount when the target of the sampled amount is set to 30 kg and the speed is controlled by the conventional method and the method of the present invention with respect to the sampled amount by the box sampler. Shows the deviation σ of. As shown in the figure, in the case of the conventional method, the sampling amount varies in the range of ± 5 kg or more around 30 kg, and the average value is 26.7 k.
g, and the deviation σ is 4.51. On the contrary,
In the case of the method of the present invention, the collected amount varies only within a range of ± 0.5 kg centered at 30 kg, and the average value is 2
It is 9.6 kg, and the deviation σ becomes 1.12. From the above, according to the method of the present invention, the sampled amount can be made to match or approach the target value with higher accuracy than the conventional method, and the sampled amount is a constant value with almost no variation. I understand. Further, as described above, according to the method of the present invention, the amount of the sample collected is constant, so that when the collected sample is sieved with a vibrating sieve, the variation in the obtained ratio of the raw materials having a particle size of -5 mm and +5 mm is reduced. That is, the accuracy of the sieve analysis is improved by the method of the present invention. This is because in the vibrating screen, if the raw material on the screen always has a constant weight, the screen efficiency becomes constant. On the other hand, in the conventional method, since the inoculation amount is not constant, the sieving efficiency varies, which reduces the accuracy of the sieving analysis and varies the proportion of the raw material having a predetermined particle size. Here, in order to confirm the improvement of the above-mentioned sieve analysis accuracy, a sample collected a plurality of times by the conventional method and the method of the present invention is passed through a vibrating sieve to screen raw materials having a particle size of +5 mm and -5 mm, and a raw material having a particle size of -5 mm relative to the total weight of the sample. The results of measuring the content (%) of are shown in FIG. As shown in FIG. 6A, in the conventional method, the total amount of sample varies greatly because the sampling amount is not constant, and the particle size of -5 m
The raw material content of m also fluctuates within a range of approximately 3.5 to 5%, and the fluctuation is within the range of 1.6% as shown in FIG. On the other hand, when a sample is taken using the method of the present invention as shown in FIG. 4 (A), the total weight of the sample becomes constant at about 180 kg and the inclusion of the particles having a particle size of -5 mm is included. The rate is almost 4.4% to 5.
The variation is 5%, and as shown in FIG. 4 (B), the variation is focused within a certain range of 0.65%. The variation of the content rate measured as described above is 1.6% in the conventional method, while it is 0.65% in the method of the present invention.
It is understood that the analytical accuracy of the 5 mm raw material can be improved step by step. This indicates that the method of the present invention is not only a technique of simply collecting a fixed amount of a sample, but a technique of reliably improving the analysis accuracy at the time of sampling by using a fixed amount of the sample. . Also, the raw material sent to the blast furnace during blast furnace operation has a grain size of -5 mm
In order to achieve the target content rate of 6%, the content rate of 5.2% was conventionally adopted as the operation control value, but this operation control value could be set to 5.7% by the method of the present invention. The operation control value was changed by changing the mesh size of the product system screen. Since the operation control value could be improved as described above, the blast furnace feed rate of the sinter having a grain size of -5 mm could be increased. As a result, the amount of returned ore that cannot be sent to the blast furnace can be reduced (5.51 t / hr in this example;
6) The operational efficiency can be improved, and the fuel consumption for reburning the returned ore is reduced due to the reduction of the amount of returned ore (23,310,0 in this example).
It can be reduced by ¥ 00 / every), and the economic efficiency is dramatically improved. In addition, although the sinter ore which is a steel raw material was shown as a measurement object in the said Example, the implementation range of this invention is not limited to this, It can implement | achieve about the BOX sampler of another measurement object.

【The invention's effect】

As described above, according to the present invention, it is possible to collect a sample having a sampling representative property, and it is possible to always collect a sample of a fixed amount with a high accuracy. As a result, accurate measurement values can be obtained in particle size measurement, strength measurement, etc. in sampling equipment. In addition, since accurate measurement values of raw materials are obtained in this way, product quality,
An excellent effect that both the operating efficiency and the economical efficiency can be improved can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram including a perspective view showing an overall configuration of a moving speed control system for a box sampler according to an embodiment of the present invention, FIG. 2 is a flow chart showing a control procedure in the system, and FIG. 3 is a box. A diagram showing a comparison of examples in which the amount of sampled by the sampler is controlled by the conventional method and the method of the present invention, and FIG. 4 is a particle size with respect to the total weight of the sample when controlled by the conventional method and the method of the present invention.
A diagram showing a comparison of the content rate of 5 mm raw material and its variation, FIG. 5 is a cross-sectional view showing an example of the overall configuration of the box sampler as seen from the conveyor direction, and FIG. 6 is sent by the belt conveyor. It is a principal part perspective view which shows the example of the state which collects a raw material with a box sampler. 10 …… Box sampler, 12 …… Raw material, 14 …… Belt conveyor for transporting raw material, 16 …… Sampling box, 40 …… Belt wear, 42 …… Speed calculation control device, 44 …… Weighing device, 46 …… Speed control device, 48 ... display device, 50 ... drive device.

Claims (1)

[Claims] 1. A sampling amount of a measurement object being transported by a predetermined transportation means. Therefore, when a sample is sampled from the measurement object using a box sampler, a transportation amount of the measurement object is detected and integrated. Depending on the sampling conditions, either the quantitative integration method or the constant time integration method in which the target measurement object and the collected sample are in the same range is used, and the moving speed of the box sampler is calculated from the detected transport amount. Then, the obtained moving speed is corrected based on the past results of the error that has a strong correlation with the transportation amount of the measurement object and the steady error, and the box sampler is moved at a constant speed according to the corrected moving speed to sample the sample. A method for controlling the speed of a box sampler for sampling, which comprises collecting the sample.