JPH0454416Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a method for accurately measuring powder and granular materials having a certain shape, such as grains such as rice and beans, or materials for molding synthetic resins. , relates to a gate for measuring the flow of powder and granular materials.

(Prior art) When measuring the flow rate of powder or granular material as described above, the method that has been commonly used in the past is to receive the powder or granular material to be measured in a weighing container and weigh its weight within a short period of time. There is a so-called batch-type measuring method in which the process of discharging this is repeated and measured. This method allows for highly accurate weighing, but
There is a problem that the flow of products is not smooth. Therefore, this device is combined with a rotary box-shaped capacity flow valve to mix the powder at a constant ratio and control the degree of refinement. In this prior art, since the mixing ratio etc. must be determined as a value replaced with a volume ratio, there is a problem in that the mass ratio lacks accuracy due to the characteristics of the powder or granular material. Therefore, the inventor of the present invention conducted extensive research and invented a method for measuring powder and granular materials in a fluid state, and has already applied for a patent (patent application).
61-220996).

(Problems to be Solved by the Invention) With the completion of the above invention, it has become possible to measure granular materials in a fluid state. The present invention improves a part of the apparatus of the invention of the above-mentioned application to improve measurement accuracy and prevent pulverizing of powder and deviating the operating point of the gate.

(Means for Solving the Problems) As a means for solving the above-mentioned problems, the present invention provides a flow metering method that detects the weight of powder while flowing it from a hopper at the bottom of the tank to a tray connected to the hopper. In the apparatus, a gate that opens and closes in a direction perpendicular to the flow direction of the powder and granular material is provided between the hopper and the tray, and when the gate is closed, the upper surface of the gate and the tray located below the gate are disposed. A gap is provided between them to a degree that the powder cannot pass through due to a bridging phenomenon, and this position is used as the reference point of the operation.

(Function) With the above configuration, the gap that can substantially stop the flow of the powder and granules prevents the powder from being crushed, and the gate operating point is also prevented from being deviated due to the powder and granules getting caught. This means that stable flow and shutoff control can be achieved. Therefore, flow measurement can be performed accurately over a long period of time.

(Embodiment) Next, an embodiment of the present invention will be described with reference to the drawings. First, in FIG. 1, reference numeral 1 denotes a base, which is approximately triangular in shape. At the top of this base 1 is a hopper 2 that receives the powder from above and flows it downward.
A gate 3 and its drive mechanism 4, which will be described later, are provided below the hopper 2. A flow tray 5 and a weight detection tray 6 are provided below the gate 3. The flow tray 5 is integrally attached to the base 1, and the weight detection tray 6 is floating relative to the base 1.
That is, it is supported via a load cell 7 fixed to the base 1 as a weight detection element. The load cell 7 detects the weight of the granular material flowing from the hopper 2 through the flow tray 5 and onto the weight detection tray 6 when it is on the weight detection tray 6.

The drive mechanism of the gate 3 is a motor 8 with a reduction gear.
, coupling ring 9, screw rotating part 10, screw 11
and a converter 1 that converts the rotation into the opening degree of the gate 3
The motor 8 rotates a screw 11, and the rotation of the screw 11 moves the gate 3 forward and backward with respect to the path of the powder and granules. It is something. The opening degree of gate 3 is determined by limit switch 1.
3 and is applied to a control circuit to be described later.

FIG. 2 is a block diagram showing the configuration of the control circuit. As shown in this figure, the control circuit includes a motor control circuit 14, a memory controller 15, an external setting device 16 for externally setting the memory controller 15 using a communication line, etc., and a manual setting device. It consists of a manual setting device 17. External setting device 1
6 and the manual setting device 17 instruct the storage control unit 15 to control the opening/closing of the gate 3 and control the opening degree setting. In addition, the memory control unit 15 outputs a signal to the motor drive circuit 14 so that the upper surface of the gate 3 and the flow tray 5 has an opening degree corresponding to the value set by one of the setting devices described above,
The motor drive circuit 14 rotates the motor 8 based on this signal. The limit switch 13 detects that the gate 3 is closed with a gap d, and sends the signal to the storage control section 15. When gate 3 is closed, the gap d is about 3 mm when the powder is rice, compared to when it is fully closed.
Set the motor so that it stops rotating when it opens to a certain degree. This position becomes the starting point of the movement.

What is shown in FIG. 3 is a flowchart that determines the starting point of the gate operation of this device. To explain this, when the limit switch 13 is on (step 18), the motor 8 is rotated in the direction in which the gate 3 opens (step 19), and when the gate 3 is opened and the limit switch 13 is turned off (step 20), the gate is opened. The motor 8 is rotated in the direction of closing the opening 3 (step 21). When the limit switch 13 is turned on (step 22), the setting operation of the gate 3 is completed (step 23) to the zero position of the gate 3 (about 3 mm open from the fully closed state as described above).

(Effects of the invention) Since the present invention is a rheometer device for powder and granular material configured as described above, even if the type of powder and granular material changes and the gap that causes the bridging phenomenon changes,
The opening degree of the gate (the value of the gap when closed) can be easily reset to correspond to the gap at that time. This has the advantage that for all kinds of powder and granules, there is no possibility of crushing the powder or getting caught in the powder and granules, which would disturb the opening degree of the gate.

[Brief explanation of the drawing]

Fig. 1 is a side view of one embodiment of the present invention, Fig. 2 is a block diagram showing the control circuit of Fig. 1, and Fig. 3 is a side view of an embodiment of the present invention.
The figure is a flowchart explaining the flow of operation of the apparatus of FIG. 1. 1... Gate, 2... Hopper, 3... Shutter, 4... Drive mechanism, 5... Flow tray, 6...
...Weight detection tray, 7...Load cell, 8...
Motor, 11...screw, 13...limit switch.

Claims (1)

[Scope of utility model registration request] In a flow metering device that detects the weight of powder while flowing it from a hopper at the bottom of a tank to a tray connected to the hopper, a device is provided between the hopper and the tray in a direction perpendicular to the flow direction of the powder or granular material. A gate that opens and closes is provided, and when the gate is closed, a gap is provided between the gate and the top surface of the tray located below the gate to the extent that the powder or granules cannot pass through due to a bridging phenomenon. A gate for measuring the flow of powder or granular material, characterized in that the position is used as a reference point of operation.