JPH0812102B2 - Measuring method of instantaneous powder discharge amount - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the instantaneous powder discharge amount, which can continuously measure the instantaneous powder discharge amount of a powder feeder or the like.

[0002]

2. Description of the Related Art Conventionally, as a method of this kind, when a powder is supplied by a powder feeder with a pressure / weight sensor such as a load cell, the amount of change (decrease amount) in the powder weight detected within a unit time ) Is simply divided by the unit time required for detection to calculate the instantaneous discharge amount of the powder, and then the calculation is repeated for each unit time, and the instantaneous discharge amount of the powder at that time (actual Was designed to measure the average amount of powder reduction within a unit time).

[0003]

However, in the above-mentioned conventional method, when the set unit time is short, the amount of powder discharged per hour is slow (a minute amount) and the amount of change in the powder weight is small, so that there is no change over time. Changes become unclear. Further, if the unit time is lengthened, the calculation interval becomes too large, and the change over time in the powder discharge amount at that interval becomes coarse, resulting in an unclear change over time. there were.

The present invention has been proposed in view of the above problems, and an object thereof is to change the powder instantaneous discharge amount with time regardless of the length of the unit time for measuring the powder instantaneous discharge amount. The object of the present invention is to provide a method for measuring the instantaneous powder discharge amount, which can smoothly and continuously obtain and accurately measure the instantaneous powder discharge amount.

[0005]

To achieve the above object, the present invention detects the weight of the powder container at each moment,
A method for measuring an instantaneous amount of powder discharged little by little from the container, which is a ratio T of a unit time T required for measurement and a minute time t which is a time interval of the instantaneous amount of discharge required by an apparatus.
Prepare a number N of data buffers given by / t, and
The weight of the powder container at the time of is stored in the first data buffer, and the weight of the powder container at the second time after a lapse of a minute time t from the first time is stored in the second data buffer. Then, the weight of the powder container at that time is sequentially stored in another data buffer every time a minute time t has passed, and the weights of the powder containers are stored in all the data buffers, while the first time is stored. Then, when a unit time T has elapsed, the difference between the weight of the powder container at that time and the weight stored in the first data buffer is divided by the unit time T to obtain the instantaneous powder discharge amount at that time. When the unit time T has passed from the second time, the weight of the powder container at that time and the second time
The difference between the weight of the powder container and the weight stored in the data buffer is divided by the unit time T to obtain the powder instantaneous discharge amount at each time. From that time, the difference between the weight of the powder container and the weight of the data container in the past of the unit time T is divided by the unit time T to obtain the instantaneous powder discharge amount. To do.

[0006]

According to the above-described structure, the unit time T for measuring the instantaneous discharge amount of powder is divided into minute times t, and a plurality of data buffers are provided for each minute time t. The weight of the powder container at that time is stored in each data buffer every time a minute time t has elapsed after the first time, and when the weight of the powder container is stored in all the data buffers, the powder at that time is stored. The difference between the weight of the body container and the weight of the powder container a unit time T past from that time,
Since the instantaneous discharge amount of the powder is calculated by dividing by the unit time T, it is not the average value measurement in the unit time as in the conventional method, but the instantaneous transition of the powder. It is possible to accurately measure changes in the discharge amount with time.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment equipped with the method for measuring the instantaneous powder discharge amount of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of a continuous kneading type mud making plant having a powder feeder A equipped with the method for measuring the instantaneous powder discharge amount.

The powder feeder A is roughly classified into an electric motor 1a.
And a powder container 2, a sensor 3 such as a load cell, a weight sensor converter 4, an arithmetic and control unit 5, a powder discharge amount indicator 6, and a motor control unit 7. The weight of the powder container 2 is equal to that of the load cell sensor 3
Is measured, and the value is converted into an electric signal by the weight sensor converter 4 and output to the arithmetic and control unit 5, and the calculation result is shown in the powder discharge amount indicator 6 and the arithmetic and control unit 5 A drive signal for the electric motor 1 a is output to the electric motor control device 7, and the electric motor 1 a is output via the electric motor control device 7.
It is configured to control the amount of powder discharged from the feeder main body 1 by changing the rotation speed of a.

On the other hand, below the powder feeder A, a continuous kneading unit B for kneading the discharged powder with water is provided. The kneading device section B is roughly composed of a continuous mixer 10, a flow meter 11, a pump 12, and a water tank 13,
The water in the water tank 13 is continuously supplied to the continuous mixer 10 by the pump 12, and the instantaneous flow rate of this water is measured by the flow meter 11, and the measured value is input to the arithmetic and control unit 5 to be calculated. An output signal based on the result is used to change the number of revolutions of the electric motor 1a in the feeder main body 1 via the electric motor controller 7 to control the amount of powder discharged from the feeder main body 1.

A combination of the powder feeder A constructed as described above and the continuous kneading device section B constitutes a continuous kneading type mud making plant as an embodiment of the present invention. Next, the operation of the embodiment configured as described above will be described based on the flowchart of FIG. This embodiment is controlled by a programmable controller built in the arithmetic and control unit 5 based on the program shown in FIG.

First, the weight data stored in all data buffers are cleared by the start (S1).
After that, it is checked whether a minute time t has passed (S
2) When the minute time t has been reached, this is set as the first time to set the first data buffer, and the weight of the powder container 2 at this time is stored in the buffer (S3).

Next, after a lapse of the minute time t again, the second time is set (S4), and the second data buffer is set.
The weight of the powder container 2 at this time is stored (S5). In the above (S4), if the minute time t is not achieved, the check is repeated until it is achieved. After that, the same operation is repeated every time a minute time t elapses, the weight of the powder container 2 at that time is stored in each data buffer, and after the weight data is stored in all the data buffers, the minute time t elapses again. At time (S6), the difference between the weight of the powder container 2 at this time (S6) and the weight data stored in the first buffer (S3) is divided by the unit time T. The powder instantaneous discharge amount is calculated, and the calculated result is indicated by the powder discharge amount indicator 6 in units of weight.

Then, at the time (S8) when a minute time t has elapsed from the above (S6), the weight of the powder container 2 at that time and the second data buffer (S5) are again measured.
The difference from the weight data stored in is divided by the unit time T to calculate the powder instantaneous discharge amount at this time (S9), and the result is indicated on the powder discharge amount indicator 6 by weight unit. . Thereafter, each time a minute time t elapses, the weight of the powder container 2 at that time,
From that time, the difference from the weight data of the data buffer stored in the unit time T in the past can be divided by the unit time T to calculate the powder instantaneous discharge amount at each time. Regardless of the length of time, the amount of change in the powder discharge amount over time can be obtained smoothly and continuously, and the result can be confirmed by the powder discharge amount indicator 6 and the powder can be confirmed through the arithmetic and control unit 5. By controlling the body feeder A, the kneading accuracy in the continuous kneading type mud plant can be surely made uniform.

[0014]

As described above, according to the present invention, regardless of the unit time interval for measuring the instantaneous discharge amount of powder,
Since the change over time in the powder discharge amount can be obtained smoothly and continuously, the powder instantaneous discharge amount can be accurately measured, and the measurement accuracy can be significantly improved.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a continuous kneading type mud plant having a powder feeder equipped with the method for measuring the instantaneous powder discharge amount of the present invention.

FIG. 2 is a flowchart showing a program for controlling the present invention.

[Explanation of symbols]

 2 Powder container T Unit time t Minute time

Claims (1)

[Claims] 1. A method for measuring the instantaneous amount of powder discharged from the container while detecting the weight of the powder container at each instant, wherein the unit time T required for the measurement and the apparatus are The number N of data buffers given by the ratio T / t to the minute time t which is the time interval of the required instantaneous discharge amount is prepared, and the weight of the powder container at the first time is stored in the first data buffer. Then, the weight of the powder container at the second time after a lapse of a minute time t from the first time is stored in the second data buffer, and thereafter, the powder container at that time is sequentially and sequentially after a lapse of the minute time t. And store the weight in a separate data buffer,
While the weight of the powder container is stored in all the data buffers, when the unit time T has passed from the first time, the weight of the powder container at that time and the weight stored in the first data buffer. Is divided by the unit time T to obtain the instantaneous powder discharge amount at that time, and at the time when the unit time T has elapsed from the second time, the weight of the powder container at that time and the second The difference from the weight stored in the data buffer of is divided by the unit time T to obtain the powder instantaneous discharge amount at that time, and thereafter, at every minute time t, the weight of the powder container at that time, and Since then, the unit time T is the difference from the weight of the data buffer storing the weight of the powder container in the past.
The method for measuring the instantaneous powder discharge amount is characterized in that the instantaneous powder discharge amount is obtained by dividing by.