JPS6265829A - Powder supply device - Google Patents

Abstract

PURPOSE:To prevent the fluidity of powder from lowering due to blocking and adhering of powder in a hopper or a pipe line, by providing such an arrangement that powder in a feed pipe connected to a hopper, upstream of a large capacity supply valve, is sucked into a circulation pipe by means of an ejector so that the sucked powder is circulated to the inlet of the hopper. CONSTITUTION:In a supply and weighting device 1 for powder-like drug materials, a feed pipe 3 is connected to the outlet port 2b of a hopper 2 having large and small agitating blades 7, 8 adapted to be rotated by a motor 9 when it is operated, and the material is fed by a large amount into a cup 14 disposed on a weighing unit 13 in the hopper 2 under the control of a large volume supply valve 12 disposed in the feed pipe 2. In this arrangement, a circulation pipe 17 is disposed between the feed pipe 2 upstream of the large capacity supply valve 12 and the inlet port 2a of the hopper 2, a circulation ejector 18 being disposed in the circulation pipe 17, and the upper side end part 17a of the circulation pie 17 is connected to a cyclone 19. Further, a slight volume supply pipe 21 is connected between two parts of the feed pipe 3 upstream and downstream of the large capacity supply valve 12, and a slight capacity supply ejector 22 is disposed in the pipe 21, a cyclone 23 being disposed in the pipe 21 downstream of the ejector 22.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an improvement in a powder supply device.

(Prior Art) Conventionally, as a powder supply device, in order to prevent the hull forming a bridge from being difficult to discharge in the hopper,
It has been proposed to destroy the bridge by increasing the vibration of the electromagnetic vibration feeder (1986-1948).
(See Publication No. 28106).

Furthermore, a supply device has been proposed that uses gas to convey the powder in the hopper (see Japanese Patent Publication No. 58-23301 and Japanese Patent Application Laid-Open No. 60-77023).

By the way, when the powder is a chemical such as sodium chloride (NaC1) or magnesium sulfate (MgS04/7H20), its hygroscopicity and degree of caking are extremely strong, and fluidity is severely reduced due to caking and adhesion. Because of this characteristic, the electromagnetic vibrating feeder described above cannot sufficiently destroy the material, resulting in a problem that it cannot be stably supplied.

(Object of the invention) The present invention has been made in view of the above-mentioned conventional problems.
Our basic objective is to provide a powder supply device that can stably and accurately supply powders, such as chemicals, whose fluidity is particularly markedly reduced due to caking and adhesion. It is something.

(Structure of the Invention) For this reason, the present invention includes a large quantity supply valve interposed in a supply pipe connected to the outlet of the hopper, and a gap between the upstream side of the large quantity supply valve of the supply pipe and the inlet of the hopper. A circulation pipe is installed in the
A circulation ejector is interposed in the circulation pipe to suck and circulate the powder in the supply pipe to the inlet of the hopper, and a small quantity supply pipe is provided between the upstream side and the downstream side of the large quantity supply valve of the supply pipe. The a1 supply pipe is characterized in that a small amount supply ejector is interposed in the a1 supply pipe to suck and supply the powder in the supply pipe to the discharge port of the supply pipe.

(Effects of the Invention) According to the present invention, the powder on the upstream side of the bulk supply valve of the supply pipe connected to the hopper is sucked into the circulation pipe by the circulation ejector and circulated to the inlet of the hopper. Therefore, this circulation system effectively prevents a decrease in fluidity due to solidification and adhesion of the powder in the hopper and the supply pipe, thereby making it possible to stably supply the powder.

In addition, the powder on the upstream side of the large quantity supply valve of the supply pipe is sucked into the small quantity supply pipe by the small quantity supply ejector and supplied to the discharge port of the supply pipe. , and a small amount supply system using an ejector, the powder can be supplied with high precision.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the powder chemical supply/measuring device 1 is equipped with a hopper 2 having an inlet 2a at the top and an outlet 2b at the bottom, and a supply pipe 3 is connected to the outlet 2b of the hopper 2. It is set up.

A stirring shaft 6 supported by a lower bearing 4 and a lower bearing 5 is inserted into the hopper 2, and a large-diameter stirring blade 7 and a small-diameter stirring blade 8 are arranged in vertical positions on the stirring shaft 6. By rotating the stirring shaft 6 and the blades 7 and 8 via the stirring shaft 6 with the stirring motor 9, the powder is stirred and fed into the supply pipe 3 in the hopper 2 and upstream of the bulk supply valve 12. It is designed to prevent cross-linking and clogging of powder inside.

A large quantity supply valve 12 is interposed in the supply pipe 3, and the large quantity supply valve 12 transfers the powder in the hopper 2 to the supply pipe 3.
A large amount of liquid is supplied to the cup 14 on the measuring device 13 from the discharge port 3a.

When the powder is dropped and supplied from the outlet 3a of the supply pipe 3 to the cup 14, there is a risk that dust may be scattered around. By arranging the dust suction pipe 15.15,
It is designed to prevent dust from scattering.

On the other hand, a circulation pipe 17 is provided between the upstream side of the bulk supply valve 12 of the supply pipe 3 and the inlet 2a of the hopper 2, and a circulation ejector 18 is interposed in the circulation pipe 17. A hopper side end 17a of the circulation pipe 17 is connected to a cyclone 19 provided to the inlet 2a of the hopper 2.

A small amount supply pipe 21 is provided between the upstream side and the downstream side of the large amount supply valve 12 of the supply pipe 3, and a small amount supply ejector 22 is provided on the upstream side of the small amount supply pipe 21. At the same time, a cyclone 23 is installed on the lower side of the limb worker Shikuda 22.

On the downstream side of the cyclone 23 of the minute supply pipe 21, a cleaning pipe 24 is provided that blows out gas toward the downstream side.

The circulation ejector 18, the small amount supply ejector 22, and the cleaning pipe 24 each have first to third gas control valves 26a.
, 26b, 26c are interposed between the first to third gas pipes 27
A, 27b, and 27c are connected to a control section 29 that controls the pressure and flow rate of gas supplied from a compressed gas source 28.

The above-mentioned stirring motor 9, large quantity supply valve 12, gas control valve 26a
~26c and the gas pressure/flow rate control section 29 are the meter 13
It is controlled by the microcomputer 30 based on information from etc.

With the above configuration, the microcomputer 3
When the third control valve 26c is controlled to open by 0, compressed gas from the compressed gas source 28 is supplied to the circulation ejector 18,
Due to the negative pressure rising on the compressed gas, the powder in the supply pipe 3 is sucked into the circulation pipe 17 together with the gas, enters the cyclone 19 at the top of the hopper, and the gas is discharged from the gas outlet 19a, and at the same time the powder is is circulated and supplied into the hopper 2 from the powder outlet 19b.

This prevents a decrease in fluidity due to solidification and adhesion of the powder in the hopper 2 and the supply pipe 3, and at the same time reduces changes in the supply amount due to an increase in the bulk density of the powder. Stable supply of powder is guaranteed.

When a dehumidified dry gas is used as the compressed gas, a drying effect is produced on the powder, which tends to solidify significantly due to moisture absorption, and a stable supply of the powder is further ensured.

Next, the supply pipe 3 inside the hopper 2 and upstream of the bulk supply valve 12
When a large amount of powder is to be supplied after fluidization of the powder in the hopper has been completed, the micro pump 30 controls the opening of the large quantity supply valve 12, and the powder in the hopper 2 passes through the supply pipe 3. The powder is supplied from the discharge port 3a to the cup 14, and when the meter 13 detects that a predetermined amount of powder has been supplied, the microcomputer 30 closes the large quantity supply valve 12.
is controlled to close.

When powder is to be supplied in a highly accurate amount, when the second gas control valve 26b is controlled to be opened by the microcomputer 30, the compressed gas from the compressed gas source 28 is supplied to the small amount supply ejector 22, and the Due to negative pressure caused by compressed gas,
The powder in the supply pipe 3 is sucked together with the gas into the @1 supply pipe 21 and enters the cyclone 23, and at the same time the gas is discharged from the gas outlet 23a, the powder passes through the small amount supply pipe 21 from the powder outlet 23b. The cup 1 is opened from the outlet 3a of the supply pipe 3.
When the meter 13 detects that a predetermined amount of powder has been supplied, the microcomputer 3
0, the second gas control valve 26b is controlled to close.

In this way, in the pond of the large quantity supply system by the large quantity supply valve 12,
Since the small amount supply system using the ejector 22 is operated, powder can be supplied with high precision.

Note that when the second gas control valve 26b is controlled to close, highly adhesive powder may stay in the cyclone 23, albeit in a very small amount, so it goes up to the microcomputer 30 and closes the first gas control valve 26a. The opening control is performed to blow out compressed gas from the cleaning pipe 24 and discharge the accumulated powder from the discharge port 3a of the supply pipe 3.

Figure 2 shows a device for supplying, measuring and mixing multiple types (4 types) of powder (chemicals) in predetermined amounts. The casing 35
．． ..., while incorporating 351 units into a unit, the first
The unit 36 and the third unit 38 are installed in a V-shape, and the second unit 37 is hinged to the first unit 36 with a hinge pongee 40, and the fourth unit 39 is hinged to the third unit 38 with a hinge pongee 41. Join.

Then, the second unit 37 and the fourth unit 39 are installed inward in an inverted V shape so that the first unit 36 and the third unit 38t are symmetrical. Rotate outward as shown by the two-dot chain line.

3 above. A control unit 42 is installed on the side of the 4th unit) 38.39, and a control unit 42 is installed on the side of the 2nd unit. A cup supply device 43 (see FIG. 3) is installed in front of the fourth unit 37, 39,
The measuring device 13 is installed in the center of each of the units 36 to 39 to measure the weight of the powder by loading the cup 14,
A cup moving device 44 (see FIG. 4) is installed behind the measuring device 13 to move the cup 14 supplied by the cup feeding device 43 onto the measuring device 13.

As shown in FIG. 3, the cup supplying device 43 stores the empty cups 14 that have been continuously conveyed. ....

14 are chucked together with the cup tray 14a by the chuck arm 46 of the chuck cylinder 45, and supplied one by one to the starting end 47a of the belt conveyor 47 by the feeding cylinder 48, while the cup moving device 44, which will be described later, A belt conveyor 47 intermittently carries out the cup 14 which has been returned and has been mixed with powder.

Note that the configuration is almost the same as that of the chuck cylinder 45 and the cup moving device 44 connected to the chuck arm.

As shown in FIG. 4, the cup moving device 44 has a rack 52.52 extending in the front-rear direction attached to the rear of a moving plate 51 provided on a base 50.
2, the pinions 53 and 53 attached to the base 50 mesh with each other, and as the feed cylinder 54 is driven, the moving plate 51 is guided by the rack 52 and the pinion 53 and moves back and forth in parallel.

The movable plate 51 has a cup 14 attached to the cup tray 14a via links 56 and 56 by driving the chuck cylinder 55.
A chuck arm 57.57 is provided for chucking together.

Therefore, when an empty cup 14 is supplied to the starting end 47a of the belt conveyor 47, the moving plate 51 is moved forward by the feed cylinder 54, the chuck arm 57 chucks the cup 14 by the chuck cylinder 55, and then the feed cylinder 54 causes the chuck arm 57 to chuck the cup 14. The moving plate 51 is moved backward by the cylinder 54, the chuck arm 57 is unchucked by the chuck cylinder 55, and the cup 14 is loaded onto the measuring device 13.

For each cup 14 on the scale 13, each unit 36
~39 four supply pipes 3.・-13 approaches centripetally, 4
A predetermined amount of seed powder is supplied and measured into the cup 14 and mixed.

Then, the chuck arm 57 chucks the cup 14 on the measuring instrument 13 again, and the moving plate 5 is moved by the feed cylinder 54.
1 moves forward, the chuck arm 57 is unchucked by the chuck cylinder 55, and the powdered cup 14 is returned to the starting end 47g of the belt holder 47.

In addition, when supplying various powders with different fluidities, if the supply flow rates for large quantity supply and small quantity supply are individually input into the microcomputer 30 in advance, the stirring motor 9
, the large quantity supply valve 12, the gas control valves 26a to 26c, and the gas pressure/flow control section 29 are controlled by the microcomputer 30 based on information from the meter 13, etc., and a plurality of types of powder are mixed.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a powder supply/measuring device according to the present invention;
Figure 2 is a perspective view of a 4-unit type supply/metering device.
FIG. 3 is a side view of the cup feeding device, and FIG. 4 is a plan view of the cup moving device. 1... Supply/metering device, 2... Hopper, 2a.
...Inlet, 2b...Outlet, 3...Supply pipe, 12...Mass supply valve, 17...Circulation pipe, 18...Circulation ejector-121...
- Trace supply pipe, 22... Trace supply ejector-1 28... Compressed gas source.

Claims (1)

[Claims] (1) A large quantity supply valve is interposed in a supply pipe connected to the outlet of the hopper, and a circulation pipe is provided between the upstream side of the large quantity supply valve of the supply pipe and the inlet of the hopper, In the circulation pipe,
A circulation ejector is interposed to suck and circulate the powder in the supply pipe to the inlet of the hopper, and a small quantity supply pipe is provided between the upstream side and the downstream side of the large quantity supply valve of the supply pipe, and the small quantity supply pipe A powder supply device characterized in that a small amount supply ejector is interposed to suck and supply the powder in the supply pipe to the discharge port of the supply pipe.