JPH0398893A - Loss-in-weight type constant feeder - Google Patents

Abstract

PURPOSE:To enable controlling a constant flow rate in a high resolution by providing part of the forward ends of a first and a second gate plates overlapped and by cutting out a part at the forward end of each of the first and the second gate plates. CONSTITUTION:A gate device 10 attached to the bottom of a hopper 1 comprises an extension pipe 11 connected with the bottom opening of the hopper 1, a casing 14 supporting in a freely rotatable manner a first and a second gate plates 13a, 13b which open and close an opening 12 at the lower end of the extension pipe 11, and a cylinder device 9 which is attached on the side of the hopper 1 and drives the first and the second gate plates 13a, 13b. The first and the second gate plates 13a, 13b overlap each other at their respective forward ends 19a, 19b; in the first gate plate 13a, a V-shaped cut 20a tapering off toward the backward end is formed from the forward end 19a, and a similar cut 20b is formed from the forward end 19b also in the second gate plate 13b. This constitution enables approximating the quantity of a flow fed out to a targeted value in resolution higher than in conventional practices by turning the first and the second gate plates 13a, 13b.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a loss-in-weight type constant flow dispensing device.

2. Description of the Related Art This type of constant flow dispensing device is constructed as shown in FIGS. 7 and 8. The hopper 1 is supported from the fixed side B via a weighing device 2, and the control unit 3 controls the hopper 1 so that the decrease value per unit time of the weight value of the weighing device 2 becomes the target flow rate. The opening degree of the gate device 5 attached to the bottom opening 4 as a dispensing port of the hopper is controlled.
It is configured such that a constant flow rate of raw material 6 is dispensed from 1.

The conventional gate device 5 is configured as follows. A single gate plate 7 is rotatably supported by a support shaft 8,
The gate plate 7 is driven by a cylinder device 9 operated by the control section 3 to adjust the opening degree A of the bottom opening 4.

Problems to be Solved by the Invention In such a conventional configuration, when the gate plate 7 starts to be opened, it gradually opens from the end of the bottom opening 5, as shown in FIG. paid out. At this time, since the width of the raw material discharge port spans the entire width of the bottom opening 4, fine adjustment is not possible unless the amount of rotation of the gate plate 7 is controlled by minute driving. Furthermore, even if the amount of rotation of the gate plate 7 can be controlled by micro-drive, the dispensing port increases or decreases over the entire width of the bottom opening 4, so even if the resolution of the weighing device 2 is increased, the resolution of constant flow control cannot be sufficiently improved. There is a problem that cannot be done.

An object of the present invention is to improve the ability of the gate device to adjust the dispensing amount and realize high-resolution constant flow dispensing control.

Means for Solving the Problems The loss-in-weight type constant flow dispensing device of the present invention supports a hopper via a weighing device, and the value by which the weight value of the weighing device decreases per unit time becomes the target flow rate. The gate device is configured to control the opening degree of a gate device attached to the dispensing port of the hopper, and the gate device is controlled to open the bottom opening of the hopper by first and second gate plates that rotate in opposite directions. The invention is characterized in that the first and second gate plates have overlapping parts that overlap each other at the tips of the first and second gate plates, and notches are formed in the tips of the first and second gate plates. do.

Effect: According to this configuration, the tips of the first gate plate and the second gate plate overlap to completely close the bottom opening of the hopper. When the first gate plate and the second gate plate begin to rotate, the bottom opening of the hopper is first opened only at the position of the notch formed at the tip of the first and second gate plates. . When the shape of the notch narrows toward the rear end of the first and second gate plates, as the rotation of the first and second gate plates progresses, the notch becomes narrower. The dispensing port formed by this gradually becomes larger.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1 to 6. Components having the same functions as those in FIG. 7 showing the conventional example will be described with the same reference numerals.

3 and 4 show the gate device of the loss-in-weight type constant flow dispensing device of the present invention. In addition, regarding the configuration of the weighing device 2 that supports the hopper 1 and the control section 3,
Since this is the same as the conventional example shown in FIG. 7, its explanation will be omitted.

The gate device 10 attached to the bottom of the hopper 1 is
An extension pipe 11 connected to the bottom opening 5 and this extension pipe 1l.
The first and second gate plates 13a open and close the lower end opening l2 of the
, 13b rotatably supported, and a hopper.
first and second gate plates 13a attached to the side of
It is composed of a cylinder device 9 etc. that drives the cylinder 13b.

The first and second gate plates 13a and 13b are shown in FIG.
As shown in the figure, it is attached to the bearings IGa, 16b via support shafts 15a, 15b, and the support shaft 15
Gears 17a and 1 that mesh with each other are provided at one end of gears a and 15b.
7b is attached. Further, here, one end of the lever l8 is fixed to the support shaft 15a of the first gate plate 13a. The other end of the lever 18 is connected to the cylinder device 9.

As shown in FIG. 5, the first and second gate plates 13a and 13b have a shape in which tip portions 19a and 19b overlap each other, and the tip portion 19a of the first gate plate 13a has a
A V-shaped notch 20a that becomes narrower toward the rear end is formed. Tip end 19b of second gate plate 13b
A similar notch portion 20b is also formed in this case.

With this configuration, when the first and second gate plates 13a and 13b are positioned as shown in FIG.
The notch 20a of the first gate plate 13a is closed by the second gate plate 13b, and the bottom opening 5 of the hopper 1
The lower end opening 12 of the extension pipe 11 following this is closed, and the dispensing of the raw material is stopped. When the cylinder device 9 is operated, the support shaft 15a rotates and the first gate plate 13a rotates toward the position shown in FIG. 1st
As the gate plate 13a rotates, this rotation is transmitted to the support shaft 15b via the gears 17a and 17b, and the second gate plate 13b also rotates toward the position shown in FIG. First and second gate plates 13a, 1 shown in FIG.
At the rotating position 3b, the size of the outlet 2l formed by the notches 20a and 20b becomes larger than the lower end opening 12 of the extension tube 11, as shown in FIG. The opening 5 is fully open. Therefore, by adjusting the amount of protrusion and retraction of the rod 22 of the cylinder device 9, the first and second positions are adjusted between the position shown in FIG. 6 and the position shown in FIG.
By controlling the amount of rotation of the gate plates 13a and 13b, the size of the payout date 21 formed by the notches 20a and 20b can be changed almost continuously regardless of the width of the lower end opening l2 of the extension tube 11. The control unit 3
By operating the cylinder device 9 according to the above, it is possible to bring the discharge flow rate closer to the target flow rate value with higher resolution than before.

Effects of the Invention As described above, according to the present invention, the gate device in the loss-in weight constant flow dispensing device is configured such that the bottom opening of the hopper is closed by the first and second gate plates that rotate in opposite directions. The first and second gate plates are configured such that overlapping parts are provided at the tips of the first and second gate plates, and the first and second gate plates are electrically connected to each other.
, Since a notch is formed at the tip of the second gate plate, when the first and second gate plates are rotated, the notch formed at the tip of the first and second gate plates is cut out. The bottom opening of the hopper is opened first depending on the position, and the size of the dispensing port can be changed little by little regardless of the total width of the bottom opening of the hopper, and it is controlled based on the decrease in the weight value of the weighing device. By rotating the first and second gate plates through the part, the discharge flow rate can be brought closer to the target flow rate value with higher resolution than in the past.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view of the gate device, which is a main part of the loss-in weight type constant flow dispensing device of the present invention, when it is fully open; Figure 3 is a front view of the gate device attached to the hopper.
Figure 4 is a partially cutaway view along the Y-Y' line in Figure 3;
FIG. 5 is a vertical cross-sectional view of the gate device in a fully closed state, FIG. 6 is a z-z' arrow view of the same gate device, and FIG. 7 is a front view of a conventional loss-in-weight type constant flow dispensing device. FIG. 8 is a bottom view of the device. t...Hopper, 2...Weighing device, 3...Control unit, 4...Bottom opening of hopper, 9...Cylinder am
, io...gate device, 11...extension pipe, 12...
...lower opening of extension pipe, 13a, f3b...first,
Second gate plate, i5a* 15b...Support shaft, I8
...Lever, 19a, 19b...Tip portions of first and second gate plates, 20a, 20b...Notch portion.

Claims (1)

[Claims] 1. Support the hopper via a weighing device, and control the opening degree of the gate device attached to the dispensing port of the hopper so that the decrease value per unit time of the weight value of the weighing device becomes the target flow rate. The gate device is configured to close the bottom opening of the hopper by first and second gate plates that rotate in opposite directions, and A loss-in-weight type constant flow dispensing device in which overlapping parts are provided at the tips of the first and second gate plates, and notches are formed in the tips of the first and second gate plates.