JPH04296624A - Granular body quantitative supply valve - Google Patents

Abstract

PURPOSE:To measure a bulk material cheaply, fast and highly precisely by opening and closing two pieces of plunger valves from different directions reciprocally facing to each other, and by making head edges of the two plunger valves contact with each other at an inclined face. CONSTITUTION:Plunger valves A10 and B11 are optionally driven by respectively independent air cylinders 11, 13. Both of the valves can perfectly close a bulk material passage by way of making contact with each other at an inclined face they face. At the time of supplying a large quantity, both of the valves simultaneously open and make the passage in the fully opened state, and at the time of supplying a small quantity, only the valve A10 opens and causes to make a narrow gap on the passage. Consequently, it is possible to obtain a granular body quantative supply valve capable of measuring granular bodies cheaply, fast and highly precisely.

Description

Detailed Description of the Invention [0001] [Industrial Application Field] The present invention relates to a metered supply valve for powder or granules that has dual functions of supplying large volumes and supplying small volumes. In detail, the quantitative determination of fluid dyes manufactured by spray drying etc., granular dyes manufactured by wet or dry granulation methods, granular compounds such as urea or soda carbonate, granular fertilizers, livestock feed, etc. The present invention relates to a quantitative supply valve that can be applied to a wide range of applications such as metering and quantitative metering and blending. [0002] Conventionally, when measuring solids, even if they are powders or granules with good fluidity, for example, a vibrating feeder or a screw feeder is used as a feeding device to measure or mix the solids. A method is adopted in which the amount of discharge from the supply device is measured by a balance (or a load cell), the discharge weight is converted into an electric signal, and the metering is controlled by a personal computer. When using a vibratory feeder or a screw feeder, there is a tendency for powder to fall from the tip of the feeder when it is not being fed (when it is stopped).To solve this problem, a special valve or It is necessary to install a special mechanical mechanism, resulting in a complicated system and an expensive one. [Means for Solving the Problems] As a result of intensive studies to solve the above-mentioned problems, we have found that powders or granules can be fed at low cost without using expensive feeding devices such as vibrating feeders or screw feeders. We have successfully developed a powder and granular material quantitative supply valve that enables high-speed, high-precision metering with good reproducibility. That is, the present invention is characterized in that (1) two flanger valves are provided in a supply valve for discharging and metering powder or granules, and the respective plunger valves face each other so that they can be opened and closed from different directions. Air cylinder-driven powder/granular material quantitative supply valve (2) Two plunger valves face each other,
(3) Two opposing plunger valves, each of which is installed so that the length from the tip of each plunger valve to the tip of the air cylinder for driving the plunger valve can be adjusted. (4) The powder metering valve according to (1) and (2) above, in which the tip of the powder or granule material is in contact with the inclined surface thereof. The present invention relates to the powder/granular material constant metering valve described in (1), (2), and (3) above, in which the length in the parallel direction is shorter than the length. In the powder quantitative supply valve of the present invention,
Since a valve mechanism is adopted at the tip of the feeder, the valve is completely closed when the feeder is not being fed (when stopped), eliminating the problem of powder spilling out. Furthermore, since the valve according to the present invention uses air as a driving source,
It can also be used as a constant supply valve for powder and granular discharge metering devices in hazardous areas. The material of the main parts that make up the powder/granular material quantitative supply valve, both the valve body and the plunger valve, can be made of iron, stainless steel, polypropylene, tetrafluoride resin (Teflon), etc. It is more preferable for the main body to be made of tetrafluoride resin (Teflon) and for the plunger valve to be made of stainless steel in terms of corrosion resistance and abrasion resistance. When measuring a certain amount of a powder compound such as granular dye and packing it into bags, or when weighing and blending several types of raw materials with good fluidity, first supply a large volume and then reduce the volume just before the target value. By using the valve of the present invention, it is extremely easy to achieve high metering speed and metering accuracy by controlling continuous volumetric supply or intermittent supply in multiple stages. [0005] The present invention will be explained in detail below. Figure 2 Plan view and Figure 3 Elevation view (cross section) of the function of the metered supply valve.
The explanation will be divided into a large capacity supply operation and a small capacity supply operation. (Large capacity supply operation) (10) Plunger valve (A)
and (12) the plunger valve (B) can be driven arbitrarily by mutually independent air cylinders (11) and (13). In addition, (10) plunger valve (A) and (
12) The plunger valves (B) face each other and can completely block the powder passage path when closed. When (10) plunger valve (A) and (12) plunger valve (B) are opened at the same time, the passageway is completely opened and a large capacity can be supplied. (The operating state in the fully open state is shown in the fully open state diagram in Figure 8)
(Small volume supply operation) When supplying a small volume, (10) If only the plunger valve (A) is opened, (12) a narrow space will be created between the plunger valve (B) and the passage path. , can be supplied in small quantities. Furthermore, if a minute amount of supply is required, the purpose can be easily achieved by performing the small amount supply operation intermittently. (The operating state in the half-open state is shown in the half-open state diagram in FIG. 9) The contact surfaces of (10) plunger valve (A) and (12) plunger valve (B) are shown in FIGS. 4 and 7. It is possible to contact on the inclined surface and close the powder passage path. The inclination angle (θ in FIG. 5) of the plunger valve is preferably about 10 to 45 degrees. This is done by opening (12) plunger valve (B) when supplying a small volume.
(10) When the plunger valve (A) is closed, the powder tries to pass through the narrow gap, but the powder and granules slide down the plunger contact surface just like using a funnel. , is effective in preventing bridging. Next, the plunger valves (10) and (12) will be explained in more detail with reference to FIGS. 3 and 4. The two plunger valves are provided with a rotation stopper as shown in (19) in FIG. 4 to prevent the plunger valves from rotating or becoming eccentric when driven. Further, the valve body is provided with a groove (20) for setting a rotation stopper. (11)
The length from the tip of the piston rod of the air cylinder to the tip of the plunger valve (10) greatly affects the supply speed when supplying a small volume, but this adjustment is extremely easy with the valve of the present invention. That is, the length from the tip of the plunger valve to the tip of the air cylinder piston rod for driving the plunger valve can be adjusted at the attachment point between the plunger valve and the air cylinder. This can be easily achieved by installing a stroke adjustment plate or the like between the fixing female screw at the tip of the piston rod and the plunger male screw. Next, (16) the bridging prevention air blowing port will be explained. (Figure 3) This depends on the characteristics of the powder or granular material, but this means that (1
6) By blowing a small amount of air through the air inlet, bridging can be prevented and smooth supply can be achieved. It is desirable that the overall size of the valve be as small as possible in order to incorporate the valve into a device or handle it. The size and shape of the cross section of the powder in this valve are important for reducing the overall size of the valve and for improving metering accuracy. The size of the powder passage cross section ((17) in FIG. 3) is determined by considering the characteristics of the powder and the metering speed. The shape of the cross section is preferably such that the length in the direction perpendicular to the direction of movement of the plunger valve is shorter than the length in the direction parallel to the direction of movement of the plunger valve. An elliptical shape is desirable. This shape is preferable in order to reduce the diameter of the plunger valve and to reduce the occurrence of bridging when the powder or granular material passes through when a small amount is supplied. FIG. 1 shows a system for metering and blending powder and granular materials using the powder and granular material quantitative supply valve of the present invention. (1 in Figure 1)
) is the hopper (powder storage container), which stores the powder and granule; (2) the chute is the pipe that connects the hopper and the powder and granule metered supply valve, and the chute is the pipe in which the powder and granule always remain. ing. (3) is the powder quantitative supply valve of the present invention; (4) is:
The solenoid valve opens and closes the powder quantitative supply valve, and when the solenoid valve is in the ON state, the plunger valve is in the open state. (5) is a container that receives the powder to be discharged; (6)
(7) shows an electronic balance that weighs the powder to be discharged, and (7) a computer that controls the weight of the electronic balance and instructs the electromagnetic valve to open and close the powder and granular quantitative supply valve. . An example of operation is shown next. (7) The discharge (measurement) data is sent to the computer.
When the data is input, the computer instructs the electromagnetic valve (4) to open and close the powder quantitative supply valve corresponding to that number from among the plurality of hoppers. This opening/closing instruction receives the weighing data of the electronic balance into the computer, and when the received data is 80% or less of the target weighing value, large volume dispensing, when it is 80% to 95%, small volume dispensing, and 95% of the target value.
% to the target value, intermittent (pulse) small volume ejection is performed. The above operation is a process of weighing one powder or granule material. When several powder particles are set in each (1) hopper,
Repeat the above operations to complete the weighing. [Example] The present invention will be explained in more detail with reference to Examples. Outer diameter: 300 mm, height: 450 mm, stainless steel cylindrical (conical bottom) hopper, cylindrical (outer diameter: 25 mm) transparent acrylic chute, powder quantitative supply valve (plunger valve cylindrical outer diameter: 20 mm) , length (center length) 22 mm, plunger valve tip angle 30 degrees, made of stainless steel) (height 62 mm,
Oval shape (width 60 mm, height 100 mm, cross-sectional dimensions of powder and granular material, (length) 20 mm, (width) 15 mm (radius 7.5
mm), made of Teflon), and a powder weighing system equipped with an electronic balance was created. Using this metering system, the commercially available reactive dye Kayacion Yellow E-C
Table 1 shows the results of 10 measurements using M Clean (manufactured by Nippon Kayaku Co., Ltd.) and setting the target weighing values to 100 g and 1000 g. As is clear from the table, measurements were made with good accuracy. Table 1 Measurement target value Measurement result maximum value
Weighing result minimum value 100 g
100.2 g
99.7 g 1000 g
1000.3 g
999.8 g [0012] [Effect of the invention] Powder or granules can be fed without using expensive feeding devices such as vibration feeders or screw feeders.
A powder quantitative supply valve has been developed that is inexpensive, has good reproducibility, and enables high-speed, high-precision metering.

[Brief explanation of drawings]

Figure 1 Diagram of a powder and granule weighing system The overall diagram of a powder and granule weighing system is shown. Fig. 2 Plan view shows a top view of the powder and granular material quantitative supply valve. Figure 3 Elevation view (cross section) Shows a side view of the powder and granular material quantitative supply valve. Figure 4 Plunger valve diagram shows how to install the plunger valve. Figure 5 Angle diagram showing the tip angle of the plunger valve. Figure 6 Tip machining diagram Shows the machining method for the contact surface of the plunger valve tip. Figure 7: Fully closed state diagram shows the state in which both plunger valves are closed. In this state, the powder or granular material is in a non-supply state. Figure 8 Fully open state diagram Represents the state in which both plunger valves are open. In this state, a large amount of powder or granular material is supplied. Figure 9 Half-open state diagram Represents a state in which one side of the plunger valve is open. In this state, a small amount of powder or granular material is supplied. The names of the parts shown in FIGS. 1 to 9 are as follows. 1 Hopper (powder storage container) 2 Chute 3 Powder quantitative supply valve 4 Solenoid valve for powder quantitative supply valve 5 Powder measuring container 6 Electronic balance 7 Computer 8 Powder quantitative supply valve Main body 9 Air cylinder mounting base 10 Plunger valve A 11 Air cylinder for driving plunger valve A 12 Plunger valve B 13 Air cylinder for driving plunger valve B 14 Powder supply port 15 Powder discharge port 16 Valve Air blowing port 17 for preventing bridging of powder and granular material inside the valve Powder and granular material passage part in the valve 18 Length adjustment and fixing part from the tip of the plunger valve to the air cylinder

Claims (4)

[Claims] Claim 1: A supply valve for discharging and metering powder or granules is provided with two flanger valves, each of which faces each other and can be opened and closed from different directions. Air cylinder driven powder and granule quantitative supply valve 2. The plunger valve according to claim 1, wherein the two plunger valves face each other and are installed so that the length from the tip of each plunger valve to the tip of the air cylinder for driving the plunger valve can be adjusted. Powder quantitative supply valve 3. The powder metering valve according to claims 1 and 2, wherein the tips of the two facing plunger valves are in contact with each other on an inclined surface. 4. A cross-sectional shape of the powder passageway according to claim 1, wherein the length in the parallel direction is shorter than the length in the direction perpendicular to the moving direction of the plunger valve. Powder constant quantity valve.