JPH056854B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a quantitative feeder for powder and granule, and a method for measuring and calculating the amount of powder and granule supplied in a feeder.

(Prior art) Conventionally, a casing in which a rotary supply board having a space for accommodating powder and granules is rotatably fitted on the outer periphery is provided with a supply port for introducing powder and granules into the rotary supply board above one side, and This type has a discharge part for the powder and granular material on almost the opposite side, and fills the storage space with the powder at the supply port, moves it to the discharge part as the rotary supply plate rotates, and discharges it to the outside at the discharge part. Quantitative feeding machines and feeders are widely used. The method for calculating the supply amount of powder and granular material for this type of quantitative feeder is based on the volume of the powder storage space (total volume), the number of revolutions, and the cell specific gravity (the weight of the powder and granular material filled in a unit volume). A method of calculating as a multiplied value is widely adopted. Alternatively, you can calculate the weight of the powder by measuring the weight of the entire metering machine including the powder and granular material, and subtracting a certain weight of the metering machine itself from this measured weight. There is also a method of calculating the supply amount as a multiplied value. In addition, a method of measuring the powder and granular material contained in the annular conveyor by rotatably supporting an annular conveyor that rotates and supplies powder and measuring its tilting with one load cell was disclosed in Japanese Patent Application Laid-Open No. 1986- It is disclosed in Publication No. 27619. In addition, Japanese Patent Publication No. 51-24266 discloses that an annular conveyor that rotates and supplies powder is pivotally supported so as to be able to swing freely, is balanced by a counterweight, and the imbalance is detected by a displacement detection contact, and the annular conveyor is Disclosed is a method for maintaining a fixed amount by changing the amount of powder input into the container.

(Problem to be solved by the invention) In this type of quantitative feeder, the powder and granules in the powder and granule storage space of the rotary supply plate are not all discharged at the discharge section, and some of the powder and granules are stored in the powder and granule storage space. The particles adhered to the walls forming the space and returned to the charging section to be filled with the next powder or granular material. Therefore, there was a problem in that the amount of powder and granular material actually discharged at the discharge section was lower than the weight value calculated above, resulting in an error. In addition, Japanese Patent Application Laid-Open No. 1983-1997 discloses a method of detecting the tilting movement of the annular conveyor using a load cell or a displacement detection contact to measure the weight of the powder or granular material contained in the annular conveyor or to detect its fluctuation.
In the weight measurement method described in Publication No. 27619, the amount of weight information is only the load cell or displacement detection signal, so weight fluctuations occur on the feeding side, return side, near the input port, and near the discharge port of the annular conveyor. Are you there?
Or, it was not possible to obtain information on whether it was an increase or decrease, and it was not possible to accurately understand and calculate weight fluctuations. In particular, it was not possible to accurately measure the amount of powder adhering to the return side of the annular conveyor, making it difficult to accurately calculate the amount of powder and granular material supplied.

(Means for Solving the Problems) The present invention solves these problems, and measures the amount of powder adhering to the wall surface of the powder storage space and corrects the resulting error to ensure true powder supply. In order to provide a method for calculating the amount, a rotary supply plate with a space for accommodating powder and granules is rotatably fitted into a sealed casing, and a rotating supply board with a space formed on the outer periphery for accommodating powder and granules is rotatably fitted into the sealed casing, and a A supply port for introducing powder and granular material into the powder storage space of the rotating supply board is opened, and the upper and lower walls of the peripheral end of the sealed casing on the opposite side to the supply port are opened, and air flows through each of the openings. A vertical pipe for vertically discharging powder and granular material is connected by a vertical pipe, and also between the supply port of the sealed casing and a powder charging device for charging powder and granular material into this, and between the vertical pipe and the air connected to this. The sealed casing is connected to the transportation main in a structure that does not load the weight of peripheral equipment on the sealed casing side, and the sealed casing is located on a perpendicular line passing through the center and perpendicular to the center line connecting the supply port of the sealed casing and the vertical pipe. A weight measuring device using one and two load cells is placed at the lower surface of the symmetrical peripheral edge of the device, the entire device is supported by the weight measuring devices of these three load cells, and the force and force are calculated from the measured values of these three weight measuring devices. The weight of the powder adhering to the powder storage space of the rotating supply board on the return path is calculated based on the moment balance equation, and the calculated weight of the adhering powder is calculated as the weight of the adhering powder to the powder storage space of the rotating supply board. The powder weight calculated by multiplying the volume, rotation speed, and packed powder weight per unit volume, or by subtracting it from the total weight of the powder on the transfer path calculated from the above-mentioned multiple weight calculators. The present invention provides a measurement correction method for the amount of powder and granular material supplied, which is characterized by calculating the amount of powder and granular material supplied.

(Example) A detailed explanation will be given below using examples.

The embodiment shown in the drawings has one piece located on the lower surface of the symmetrical end of the sealed casing 1 on a right angle line 4' passing through the center and perpendicular to the center line 4 connecting the supply port 2 of the circular sealed casing 1 and the vertical pipe. 2 load cells 5,
6 and 7 are arranged, and these three load cells are used to transport the sealed casing 1, the rotary supply plate 8, the powder and granular material 9,
The entire weight of the drive device 10 and its accessories is distributed and supported. The rotary supply plate 8 has a large number of radial blades 11 protruding from its outer periphery, and the granular material storage space 12 is formed by the radial blades 11 and the upper, lower, and side walls of the inner periphery of the sealed casing 1 . Also, the vertical pipe 3 and the pneumatic transport main pipe 14 are connected by a telescopic pipe 15, and since the pneumatic transport main pipe 14 is fixedly supported on the ground side, the weight of the upper and lower pneumatic transport main pipes 14 is absorbed by the sealed casing. There is no load on the side. Similarly, the supply port 2 and the granular material input pipe 16 on the side of the granular material input device are also connected by a telescopic tube 17, and the granular material input pipe 16 is fixedly supported on the ground side. The weight of the 16 side is not applied to the closed casing side.

In the figure, 20 is a rotary encoder that detects the rotation speed of the rotary supply board 8, 21 is an adhered powder weight calculation circuit that calculates the weight of the remaining adhered powder, and 22 is a powder on the transfer path side of the rotary supply board 8. 23 is a supply amount calculation circuit that calculates the true powder supply amount, 24 is a display, and 25 is the volume of the powder storage space of the rotating supply board. , an input circuit for setting and inputting numerical values such as the weight per unit volume of the powder and granular material, specific gravity of the powder and granular material, 26 a rotation speed control circuit of the rotary supply board 8, 27 a comparison circuit,
Reference numeral 28 denotes a target setting value input circuit 29 for the amount of powder and granular material supplied, which is a dummy for pressure and weight adjustment.

Figure 6 shows an example of a scraper type rotary supply board, 30 is a scraper type rotary supply board, 31
32 is a powder storage shelf of the same rotating supply plate, and a scraper.

In the embodiment shown in FIGS. 1 to 5, the powder is introduced into the closed casing 1 from the powder input pipe 16 through the supply port 2, and the radial blades 1 of the rotary supply plate 8
The powder is filled in the powder storage space 12 between the closed casing 1, is cut by the inner wall surface of the closed casing 1 or by the slit plate, and is rotatably transferred in a fixed amount, and is then transported by the air flow of the vertical pipe 3 on the opposite side. It is discharged from the bottom to the top or from the top to the bottom and transported to the desired location by the pneumatic transport main 14.

The weight of the powder in the sealed casing 1 and the entire device is supported by one load cell 5 on the powder transfer path side and two load cells 6 and 7 on the return path side. Two sets of load cells 5, 6, 7
The load distribution of the closed casing 1 device and the powder and granular material acting on it is as shown in FIG. The load distribution (a) of the weight of equipment such as a closed casing is determined before measurement. Powder input pipe 1 connected to supply port 2 of peripheral equipment in sealed casing 1
6 and the vertical pipe 3 are connected by elastic tubes 15, 17 made of rubber or the like, so that their weight is not applied to the closed casing side.

The powder loads acting on the three load cells 5, 6, and 7 are the powder weight distribution in the transfer path (b), the powder weight distribution due to the attached powder in the return path (c), and the supply. This is the weight distribution (d) of the powder particles accumulated in mouth 2.

Here, a plurality of powder storage spaces 1 of the rotary supply board 8
2, the instantaneous powder particle weight distribution (b) (filling ratio), the powder particle weight distribution (b) (filling ratio), and The weight distribution c (adhesion rate) and the particle weight distribution (d) can be calculated from the force moment equilibrium equation and the measured values of the loads acting on the load cells 5, 6, and 7. From this, the weight of attached powder particles is determined, and the weight of the transferred powder is calculated from the powder weight distribution (b), or the transferred powder is calculated from the formula of powder storage space volume x unit volume powder weight x rotation speed. By subtracting from the grain weight value, the true amount of powder supplied can be determined. These calculations are performed by a transferred powder weight calculation circuit 22, an attached powder weight calculation circuit 21,
This is done by the supply amount calculation circuit 23.

It goes without saying that the calculation formula for the powder supply amount is not limited to the above model calculation method, and other models and calculation formulas may be used.

In particular, in this embodiment, the supply port 2 of the sealed casing 1
By arranging the load cell 5 and the load cells 6 and 7 on the lower surface of the symmetrical peripheral end of the sealed casing 1 on the right angle line 4' passing through the center and perpendicular to the center line 4 connecting the vertical pipe 3 and The powder weight distribution (d) stored in 2, the impact load when the powder is introduced into the supply port 2, and the impact load when it is discharged from the vertical pipe 3 are transmitted to two sets of load cells 5, 6, and 7. The effect is suppressed by making it work in the same way. Furthermore, the air pressure from the air transport main pipe 14 acts on the upper and lower telescopic pipes 15, the telescopic pipes 17, and the dummy 29 in the same way, thereby reducing the influence of the air pressure.

In this embodiment, the rotational speed of the rotary supply plate 8 can be further controlled so that the amount of powder and granular material supplied reaches a target setting value.

(Effects of the Invention) As described above, according to the present invention, it is possible to correct the weight of the powder particles remaining on the rotary supply plate and measure the true supply amount of the discharged powder particles.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing the structure of a powder supply device according to an embodiment of the present invention, FIG. 2 is a plan view of the same, FIG. 3 is a plan view showing the arrangement of load cells, and FIG. 4 is a plan view of the same embodiment. FIG. 5 is a diagram of the weight distribution acting on the load cell, and FIG. 6 is an explanatory diagram showing the structure of a scraper type powder supply device. 1... Sealed casing, 2... Supply port, 3...
Vertical pipe, 4... Center line, 4'... Right angle line, 5, 6,
7... Load cell, 8... Rotating supply plate, 9... Powder, 10... Drive device, 11... Radial vane,
12... Powder storage space, 14... Air transport pipe,
21... Adhesive powder particle weight calculation circuit, 22... Transfer powder particle weight calculation circuit, 23... Supply amount calculation circuit.

Claims (1)

[Claims] 1. A rotating supply plate with a space formed around the outer periphery for accommodating powder and granular material is rotatably fitted into a sealed casing,
A supply port for introducing powder and granular material into the powder storage space of the rotating supply board is opened at one circumferential end of the upper wall of the sealed casing, and the upper and lower wall surfaces of the circumferential end of the sealed casing opposite to the supply port are opened. A vertical pipe is connected to each opening to vertically discharge powder and granular material by air flow, and between the supply port of the sealed casing and a powder and granular material input device that introduces powder and granular material into this. The vertical pipe and the pneumatic transport main pipe connected to it are connected in a structure that prevents the weight of peripheral equipment from being loaded on the sealed casing side, and the center line is connected to the center line connecting the supply port of the sealed casing and the vertical pipe. A weight measuring device using one and two load cells is placed at the bottom surface of the symmetrical peripheral edge of the sealed casing on a perpendicular line passing through the The weight of the powder adhering to the powder storage space of the rotating supply board on the return path is calculated based on the force-moment equilibrium equation from the measured values of the two weight measuring instruments, and the calculated weight of the adhering powder is calculated. Powder weight calculation value obtained by multiplying the volume and rotation speed of the powder storage space of the rotating supply plate by the packed powder weight per unit volume, or the powder or granule on the transfer path calculated from the above-mentioned multiple weight calculators. A measurement correction method for the amount of powder and granular material supplied, characterized in that the true amount of powder and granular material supplied is calculated by subtracting it from the total weight value.