JP3165203B2 - Discharge control valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge control valve for a solid-containing fluid such as a granular material or a slurry, and more particularly to a raw material and a colorant in a manufacturing process of synthetic resin products, foods, pharmaceuticals, cosmetics, and the like. The present invention relates to a discharge control valve suitable for use in metering and dispensing of powder and granules such as trace additives.

[0002]

2. Description of the Related Art Conventionally, a transportation system of a mixed fluid (powder) of a solid (powder, particles, etc.) and a gas (air, nitrogen gas, etc.), a solid (particles, coal, activated sludge, etc.) and a liquid (water,
A so-called solid-containing fluid transport system such as a mixed fluid (slurry) transport system with oil or the like is known.

In such a solid-containing fluid transport system, a valve seat is provided in the middle of a solid-containing fluid transfer passage connecting the fluid inlet and the outlet, and the valve slides along the valve seat to form a flow passage. A valve having a valve element that opens and closes is known (see Japanese Patent Application Laid-Open No. 3-129188). The valve used in the transport system of the solid-containing fluid is interposed in a vertical flow path to prevent the solid in the fluid from being clogged, and the posture at the time of use moves the valve body in a substantially horizontal direction. It is installed so as to move and open and close, and is used only for fully open and fully closed, and is not used for flow control.

On the other hand, for example, a valve body is provided in a vertical falling flow path below a popper containing the above-mentioned powder and granular material, and the valve body is moved and displaced in a substantially horizontal direction to form a valve body and a valve seat. There is known a cutout valve (discharge control valve) that adjusts a fluid flow path area to be discharged and adjusts a discharge flow rate of a granular material flowing and falling due to gravity (Japanese Utility Model Publication No. 3-5595 and Japanese Utility Model Publication No. 3-5595). -8353).

[0005] Further, as a device for discharging powders and granules, there is also known a device for controlling a screw feeder, a vibration feeder and the like as accurately as possible to control a discharge flow rate to a very small amount and obtain a target set weight. .

[0006]

However, in the above-mentioned cut-off valve, a very rough discharge flow rate control is possible, but it is impossible to control the discharge flow rate accurately to the order of about 0.1 g. It is impossible at all. In addition, at the present time, the discharge device of the powdery material such as the screw feeder and the vibration feeder described above cannot control the discharge flow rate with high accuracy.

[0007] In particular, in a compounding facility in which a plurality of kinds of powders (raw materials) are weighed and put into a single container by a predetermined amount to obtain a required composition, a plurality of kinds of raw materials can be efficiently and highly accurately prepared. However, the above-mentioned various discharge control valves and devices cannot accurately control the amount of discharge as described above, so that the measurement accuracy of Is not satisfactory. Further, when the handled material has a hygroscopic property or poor fluidity, the granular material adheres to the valve body, causing a blockage of the flow path, and sometimes the measurement itself becomes impossible. For this reason, it is often necessary to rely on artificial work for a part of the weighing process, and it is difficult to automate the process, and there are also problems in productivity, work safety, hygiene, and the like. In particular, in the case of a trace amount of additive, the measurement accuracy is often required, and there is a problem in terms of efficiency in a manual operation.

Accordingly, the present invention has been made in view of the above-mentioned conventional problems, and has been made such that a solid-containing fluid such as a granular material or a slurry is brought into a state close to a floating state by a gas in a valve body, and the valve body is substantially Focusing on the ability to easily adjust the minute flow rate of the solid-containing fluid, etc. by using it in a position that opens and closes by moving in the vertical direction. It is an object of the present invention to provide a discharge control valve which can be used.

[0009]

For this reason, the discharge control valve of the first invention is provided in the middle of the flow path connecting the fluid inlet and the outlet.
The valve is opened and closed by a valve that moves in a substantially vertical direction.
A discharge control valve having a port formed on a substantially vertical surface , wherein a flow path bottom surface extending from the fluid inlet to a position near the valve body is inclined downward; and a fluid inlet side downstream of the inclined portion. A gas outlet provided at a lower portion of the flow passage near the valve body and for blowing gas from substantially below to substantially upward, and a gas for introducing gas to the gas outlet intermittently or continuously while at least the opening is open. And an introduction means.

A discharge control valve according to a second aspect of the present invention is provided in the middle of a flow path connecting a fluid inlet and an outlet, and moves in a substantially vertical direction.
A discharge control valve in which an opening that is opened and closed by a valve body is formed substantially on a vertical plane , wherein a bottom surface of a flow path from the fluid inlet to a position near the valve body is inclined downward. And a gas outlet for blowing gas from the bottom surface of the inclined portion, and gas introducing means for introducing gas to the gas outlet at least intermittently or continuously while the opening is open.

[0011]

In this configuration, the solid-containing fluid or the like is brought into a state close to a floating state by the gas in the valve body, and becomes fluid like liquid even for a short distance within the valve body. Therefore, the valve body moves in a substantially vertical direction with respect to the flowing solid-containing fluid and the like, and the opening and closing of the valve body is adjusted and the opening and closing of the valve body is continuously performed. The flow rate can be easily adjusted to a minute range.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. First, a common embodiment of the discharge control valve of the first and second inventions will be described with reference to FIGS. FIG. 1 shows the first
FIG. 5 is a diagram showing the entire dispensing device to which the embodiment of the discharge control valve of the second invention is applied. In addition, this compounding device is to obtain a required composition by measuring each of a plurality of powders as solid-containing fluids.

In FIG. 1, the dispensing device has a number of metering valves 1 equal to or greater than the number of objects to be weighed.
A dispenser unit 2 provided with a discharge control valve according to the present invention, and each measuring valve 1 of the dispenser unit 2 which is provided in correspondence with the number of the measuring valves 1 and which weighs each object from a raw material tank (not shown). And a plurality of input devices (screw feeders) 4 for supplying to the weighing apparatus, and the weights of objects to be weighed, which are installed below the center of the dispenser unit 2 and are discharged from each weighing valve 1 of the dispenser unit 2 and stored in the weighing container 5. Weighing machine 6, a control computer 7 for controlling these devices, an interface unit 8, a charging control device 9, and a gas introducing device 10.
, A dust collection device 11 and a weight measurement control device 12.

Next, the configuration of each of the above devices will be described in detail. 1 to 3, a metering valve 1 includes a valve seat 13 provided in the middle of a flow path connecting a fluid inlet and an outlet, and the valve seat 13.
And a valve body 14 that moves along the flow path to open and close the flow path. The valve body 14 is used in a posture in which the valve body 14 is moved in a substantially vertical direction to open and close the valve body. An inlet inclined portion 47 formed as an inclined portion having a downwardly inclined flow channel bottom surface, and a lower portion of the flow channel near the valve body 14 on the fluid inlet side downstream of the inlet inclined portion 47 and the inclined portion 47. A gas blow-out port for blowing gas from substantially downward to substantially upward, and the gas introducing device 10 as gas introducing means for introducing gas into the gas blow-off port intermittently or continuously while at least the valve element 14 is open. It is composed of

The drive section of the valve element 14 of the metering valve 1 comprises an operating section 16 in which an operating element 15 having the valve element 14 is housed. That is, the main body of the operating portion 16 is
And a mounting ring 18. The plate members 17 are bent in a substantially inverted U-shape, and the respective plate side portions 17 are formed.
The planes b and 17c are disposed in parallel with each other in the vertical direction, and a rectangular opening 17a is formed in one plate side 17b of the plate member 17. The inner wall of one plate side portion 17b of the plate member 17 in which the opening 17a is formed corresponds to the valve seat 13. The lower end of the mounting ring 18 is inserted through the top of the substantially inverted U-shaped plate member 17 and fixedly attached by welding. The operating body 15 is slidably disposed in the main body of the operating portion 16, and a spring 19 for constantly urging the operating body 15 downward is provided. The distal end of the stem 20 is connected to the operating body 15, and the rear end of the stem 20 projects upward through the upper end of the main body of the operating section 16. This protruding stem 20
At the rear end, a head 21 on which a spindle cap 21a for a proximity switch and a step 21b for holding a clamp, which will be described later, are vertically arranged is attached.

A recess 18a is formed at the upper end of the mounting ring 18 of the main body 16 of the operation unit. An oil seal 23 for shaft sealing is interposed between the lower surface of the cap 22 and the inner bottom surface of the recess 18a. An annular end 25 of an arm 25 to be described later
The arm 25 has an annular end 25a which is fixedly fitted to the outer periphery of the mounting ring 18 thereabove.
4 for fastening.

The plate member 17 of the operating portion 16 is inserted into a cylindrical portion 47a formed by extending the distal end portion of the entrance inclined portion 47 and formed into a cylindrical shape, and is fixed by mounting bolts 48. The one plate side portion 17b (valve seat 13) of the plate member 17 in which is formed is opposed to the flow path of the inlet inclined portion 47. The tip of the cylindrical portion 47a is tapered to form a spoiler 47b, which constitutes the outlet of the metering valve 1.

By removing the mounting bolt 48,
The main body of the operating portion 16 can be detached from the cylindrical portion 47a, so that maintenance and inspection can be easily performed.
Further, a sponge-like sealing material (not shown) is interposed between the side ends of the respective plate side portions 17b and 17c of the plate member 17 and the inner wall surface of the cylindrical portion 47a. Is prevented from leaking from other than the opening 17a for forming the valve seat 13.

Here, the configuration of the valve element 14 and the valve seat 13 will be described. That is, the operating body 15 is shown in FIGS.
And a pair of plate members 26, a connecting member 27, and a valve body 14, each of which has a substantially trapezoidal shape as shown in FIG. The pair of plate members 26 are disposed separately in parallel in the vertical direction. The connecting member 27 has a configuration in which a flat plate member is bent into a trapezoidal shape as shown in FIG. 5, is inserted between the pair of plate members 26, and is fixedly attached to the pair of plate members 26 by welding. You. A guide member 28 is mounted on the upper surface of the connecting member 27 so that the lower end of the spring 19 is inserted and positioned.

The valve element 14 is made of, for example, Teflon or the like, and is formed in a pyramid shape such that the cross-sectional area gradually increases from the base end to the tip end. The connection between the valve element 14 and the one plate member 26 is performed by fastening a nut 30 to a distal end male thread portion of a mounting screw 29 penetrating the valve element 14 and the plate member 26 from the valve element 14 side. Do. Attachment points by the attachment screws 29 are set at three positions at both end positions and an upper end position of the plate member 26. The valve body 14 can be easily replaced by releasing the mounting with the mounting screw 29.

A plurality of spring-loaded ball plungers 31 (see FIG. 6) for pressing the valve body 14 against the valve seat 13 are provided. This ball plunger 31
Threaded portions are formed on the outer periphery, and are formed at three positions at both side end positions and the upper end position of the plate member 26, so that they are screwed into screw holes, and projecting ends of the ball plunger 31 from the back side of the plate member 26. A lock nut 32 is fitted to the external thread portion of the portion. The pressing pressure of the valve body 14 by the ball plunger 31 is variable by adjusting the locking nut 32 and moving the ball plunger 31.

Incidentally, according to the structure of the operating body 15, the gaps 33 (FIG. 4) are formed at three places on both sides and the rear end of the operating body 15.
To be weighed, such as powder or granular material, which has invaded the upper side of the operating body 15 due to the opening and closing operation of the valve body 14, at three gaps on both sides and the rear end of the operating body 15. 3
3, the pair of plate members 26 are each formed in a substantially trapezoidal shape, and the connecting member 27 is bent in a trapezoidal shape. The object can be easily dropped while sliding.

As a result, poor sliding of the valve body 14 and poor operation of the spring 19 due to biting of the object to be weighed can be prevented. As shown in FIG. 7, a notch 1 is provided at the lower end edge of
4a is provided. As shown in the figure, the notches 14a are formed at predetermined intervals of the lower edge of the valve element 14 and formed in a triangular shape such that the notch width increases downward. Penetrates before and after the lower edge. By providing the notch 14a in this way,
At the time of controlling the minute flow rate of the valve element 14, the opening area formed by the lower end edge of the valve element 14 and the opening 17a can be set to the minute opening area as shown in FIG. The selection of the opening area formed by the lower end edge of the valve element 14 and the opening 17a is performed according to the stroke when the valve element 14 is opened. The relationship between the selection of the opening area and the stroke when the valve 14 is opened will be described later.

As described above, the notch 14a is provided at the lower end edge of the valve body 14 in order to improve the accuracy of the small flow rate control. It is necessary to consider the form of the notch 14a according to the size, uniformity, ease of flow, cohesion, shear resistance, adhesion, specific gravity, etc.). 9 to 14 can be considered as the form of the notch 14a.

That is, the one shown in FIG. 9 is provided with a triangular notch 14a similarly to that described with reference to FIG. Or a semicircular shape. In FIG. 10, the cutout 14a is formed only on the fluid inlet side of the lower end edge of the valve body 14 without penetrating the triangular cutout 14a before and after the lower end edge of the valve body 14. In this case, the cross-sectional shape along a plane perpendicular to the plane of the valve body 14 is triangular.

FIG. 11 shows a single cutout 14a. In this case as well, the triangular cutout 14a is not penetrated before and after the lower edge of the valve body 14.
The notch 14a is opened only on the front side of the lower edge of the valve body 14, and the cross-sectional shape along the plane perpendicular to the surface of the valve body 14 is triangular. The one shown in FIG. 12 has the lower end edge of the valve body 14 inclined in one direction. Also,
The one shown in FIG. 13 is one in which the lower edge of the valve element 14 is inclined upward from the center.

Further, in FIG. 14, a single notch 14a is provided, and in this case, a triangular notch 14a is penetrated before and after the lower edge of the valve body 14. For example, for the powder having a large particle diameter and a large shear resistance, use the mold shown in FIGS. 11 and 13. For the powder having a small particle diameter and a very easy flow, use the mold shown in FIG. 9. .

The charging device 4 is connected to the measuring valve 1 of the dispenser unit 2 via a flexible pipe 34, and conveys the object to be measured from the raw material tank to the measuring valve 1 for measuring an object to be measured. It has become. Therefore, the raw material tank, the charging device 4 and the metering valve 1 are paired, and a plurality of types of the objects to be weighed or more are provided, and a dedicated raw material tank for handling only the same type of the weighing object is provided. A pair of device 4 and metering valve 1 is formed to prevent different objects to be weighed from passing.

The input device 4 includes the input control device 9
Is controlled by The dosing control device 9 is provided in each dosing device 4, and is controlled by the dosing control device 9 receiving an instruction from the control computer 7 based on an open / close signal of the metering valve 1 (for example, the condition in Table 1). Controls the supply speed of the charging device 4.

[0030]

[Table 1] The dispenser unit 2 has a plurality of arms 25 attached in a substantially circular shape and at substantially equal intervals via a pivot shaft 37 along an outer peripheral end of a lower surface of a main support member 36 fixedly suspended from a beam 35 and arranged in an umbrella shape. A metering valve 1 fixed to each arm 25, and an arm drive mechanism 38 provided between each arm 25 and the main support member 36 for calling (pulling) the arm 25 to the center of the dispenser unit 2. Are provided.

One end of the double-acting cylinder 39 constituting the arm drive mechanism 38 is provided on the arm 25, and the other end is provided on the main support member 36 via pivots 40 and 41, respectively, corresponding to the respective arms 25. Is provided. At the center lower portion of the main support member 36, the valve element 14 of the metering valve 1 is provided.
A valve opening / closing drive mechanism 42 for opening / closing the valve is fixedly supported by the main support member 36, and a positioning guide 43 for determining the position of the metering valve 1 when the metering valve 1 is pulled toward the center is supported by a support 44. And is fixedly supported through. An annular drain pan 46 suspended by a column 45 fixed to the main support member 36 is provided below the dispenser unit 2.

The metering valve 1 has an inlet inclined portion 47.
Are fixed by a support 49 provided at the center of each arm 25, and the operating portion 16 is fixed to the arm 25 by sandwiching the annular end 25 a at the tip of the arm 25 between the mounting ring 18 and the fixing ring 24. Supported. Then, the control computer 7 sends the interface unit 8
The working air is selectively supplied to one of these cylinders 39 via the, and the arm 25 attached to the cylinder 39 is moved to bring the metering valve 1 to the center of the dispenser unit 2.

In the present embodiment, as shown in FIG. 2, the inlet inclined portion 47 is formed into a square cylindrical shape. In addition, you may use what was shape | molded and processed into a round cylindrical shape. The inlet inclined portion 47 is provided with a gas blower 50 including a gas outlet that blows gas from the bottom surface. There is provided a gas blowing device 51 including a gas blowing port for blowing gas toward. These gas blowers 50 and 51 are for bringing the object to be weighed into a state close to a floating state, enabling the minute flow rate to be adjusted, and preventing the flow path from being blocked.

That is, a plurality of gas chambers 50a to 50d are provided on the lower side wall portion of the inlet inclined portion 47 to constitute the gas blowing device 50, and even a weighing object having poor fluidity can be floated. A structure in which gas can flow from the gas chambers 50a to 50d through the ventilation plate 52 made of sintered metal or the like forming a gas outlet into the inlet inclined portion 47 so that the gas can be conveyed to the fluid outlet of the metering valve 1. It has become. This inflowing gas passes through the exhaust plate 53 made of sintered metal or the like formed on a part of the upper side wall of the inlet inclined portion 47 facing the ventilation plate 52 while floating the object to be weighed to the atmosphere. Released. The purpose of the exhaust plate 53 is to prevent the inside of the inlet inclined portion 47 from being pressurized as much as possible in order to prevent the object to be weighed from flowing back toward the flexible pipe 34 by the gas flow. It is. Therefore, it is preferable that the ventilation resistance of the exhaust plate 53 be smaller than that of the ventilation plate 52.

The gas chambers 50a to 50 of the inlet inclined portion 47
The assembly structure with 0d is as shown in FIG. That is, the mounting pieces 54a are fixedly mounted on the bottom inner wall surfaces of the pair of side plates 54 forming both side walls of the entrance inclined portion 47, and the ventilation plate is provided between the mounting pieces 54a, 54a of the pair of side plates 54. 52 and a substantially U-shaped bottom member 55 in which a flange portion 55a is formed so as to protrude from both ends is disposed.
With the packing interposed between the flange portion 55a and the end of the ventilation plate 52, it is integrally fixed to the mounting piece 54a by a mounting tool 56 such as a bolt. The bottom member 5
The space defined by the air passage 5 and the ventilation plate 52 is partitioned by a partition wall 57 and configured as the gas chambers 50a to 50d.

The ventilation plate 52 and the bottom member 55 of the inlet inclined portion 47
The structure shown in FIG. 17 may be used as an assembly structure of the gas chambers 50a to 50d. In this case, a bottom member 55 is provided between the mounting pieces 54a of the pair of side plates 54. Then, the flange 55a is attached to the mounting piece 54a.
, And both ends of the ventilation plate 52 are fixedly attached to the inner wall surface at the upper end of the bottom member 55 by welding or the like.

On the other hand, at the bottom near the valve element 14 between the valve element 14 and the inlet inclined section 47, the gas blowing device 51 for flowing the object to be weighed is provided in the same structure as the inlet inclined section 47. ing. The gas blower 51 is provided with a ventilation plate 58, and a plurality of gas chambers 51 are provided on a lower side wall of the ventilation plate 58.
a, 51b are provided.
However, one end thereof is movable integrally with the gas chambers 51a and 51b, and the inclination angle thereof can be changed by the angle adjusting bolt 59 depending on the properties of the object to be weighed.

The assembly structure of the gas blower 51 is as follows.
It is as shown in FIG. That is, the pair of side plates 54 forming both side walls of the entrance inclined portion 47 extend, and a mounting piece 54b is integrally formed on the bottom inner wall surface of the side plate 54. Mounting piece 54 of the pair of side plates 54
A combined body of the ventilation plate 58 and the substantially U-shaped bottom member 60 is provided between the mounting pieces 54b and 54b, and the combined body is inserted between the mounting pieces 54b and 54b to attach a sponge to the mounting piece 54b. It is supported via rubber 61. The space constituted by the combined body is partitioned by a partition 62 and is constituted as the gas chambers 51a and 51b.

In the inlet inclined portion 47 having the above-described structure, the exhaust plate 53 is formed on a part of the upper side wall, but the exhaust plate is provided on the entire upper side wall of the inlet inclined portion 47. You may do it. This example is shown in FIGS. 19A and 19B. That is, the mounting pieces 63a are integrally formed on the upper inner wall surfaces of the pair of side plates 63 constituting the both side walls of the entrance inclined portion 47, and the upper portion between the mounting pieces 63a, 63a is formed of the nonwoven fabric through the packing 65 via the packing 65. The ventilation canvas 64 is placed and fixed by a fixture such as a bolt (not shown). In this case, a mounting piece 63b is integrally formed on the bottom outer wall surfaces of the pair of side plates 63, and a non-woven air-permeable canvas 66 and a flange 67a extending from both ends are formed on the bottom between the mounting pieces 63b, 63b. -Shaped bottom member 6
7 are provided via packings 65, and both ends of the flange portion 67a and the ventilation canvas 66 are integrally fixed to the mounting piece 63a by a mounting tool (not shown).

The space defined by the bottom member 67 and the ventilation canvas 66 is partitioned by a partition wall 69 and configured as the gas chambers 50a to 50d. Note that 68
Are viewing windows provided on the pair of side plates 63 respectively. The gas chambers 50a to 50d and the gas chamber 51
Compressed air is generally used as the gas blown from a and 51b through the ventilation plate 52, the ventilation plate 58, and the ventilation canvas 66. In particular, in the case of a handled material which is easily oxidized,
Utilize nitrogen or other inert gas. Further, in the case of a handled material having a high hygroscopic property, by using dried nitrogen gas, air, or the like, the handled material can be discharged while being dried in the inlet inclined portion 47 or the cylindrical portion 47a. It is effective.

Next, the structure of the valve body opening / closing drive mechanism 42 will be described. As shown in FIG. 2, selected metering valve 1
When the metering valve 1 is brought to the center of the dispenser unit 2 by the arm driving mechanism 38, the spindle cap 2 on the head 21 of the stem 20 of the valve body 14
A proximity switch 70 for confirming that 1a has reached a predetermined position is provided in the valve clamp mechanism 73, and sends a confirmation signal to the control computer 7. When the control computer 7 confirms the signal, the clamp 72 is actuated by the clamp driving cylinder 71 of the valve clamp mechanism 73, and the head 21 of the stem 20 is engaged with the stepped portion 21b. Holding, the valve element 14 is openable and closable.

As shown in the figure, three valve driving cylinders 74, 7 having large, medium and small strokes for opening and closing the valve 14 are provided above the valve clamp mechanism 73.
5 and 76 are attached in series from the upper side to the lower side. A large stroke valve body driving cylinder 74 is fixed to the main support member 36, and an operating rod 74 a of the valve body driving cylinder 74 is connected via a connecting member 77. To the operating rod 75a of the valve drive cylinder 75 having a medium stroke. The valve drive cylinder 75 is connected to a small stroke valve drive cylinder 76, and an operating rod 76 a of the valve drive cylinder 76 is connected to the upper end of the valve clamp mechanism 73.

Here, the three valve body driving cylinders 74, 7
5, 76 and the operation thereof will be described. FIG.
, The valve body driving cylinder 74 includes a cylinder body 74.
A, and two pressure chambers 74c,
The two pressure chambers 74c and 74d are connected to a cylinder operating fluid pressure source (not shown) via piping HA1 and HB1 provided with a pressure switching valve (not shown). In this case, one chamber 74
By supplying the fluid to c (upper chamber) and opening the other chamber 74d (lower chamber), the piston 74b moves downward as shown.

Similarly, the valve body driving cylinder 75 is composed of a cylinder body 75A and a piston 75b that partitions the inside of the cylinder body 75A into two pressure chambers 75c and 75d, and the two pressure chambers 75c and 75d are not shown. It is connected to a cylinder operating fluid pressure source (not shown) via pipes HA2 and HB2 provided with a pressure switching valve. In this case, by supplying the fluid to one chamber 75d (lower chamber) and opening the other chamber 75c (upper chamber), the piston 75b moves upward as illustrated.

Similarly, the valve body driving cylinder 76 includes a cylinder body 76A and a piston 76b for partitioning the cylinder body 76A into two pressure chambers 76c and 76d. The two pressure chambers 76c and 76d are not shown. It is connected to a cylinder operating fluid pressure source (not shown) via pipings HA3 and HB3 provided with a pressure switching valve. In this case, by supplying the fluid to one chamber 76c (upper chamber) and opening the other chamber 76d (lower chamber), the piston 76b moves downward.

Then, the valve element 14 is connected to each valve element driving cylinder 7.
When moving up by 4, 75, 76, the following is performed. That is, when the valve element driving cylinder 74 drives the valve element 14 to open and close, the pressure switching valve provided in the pipes HB1 and HA1 is supplied to the cylinder pressure chamber 74d by pressure, and the pressure chamber 74c is opened. Switch as follows.

On the other hand, the pipe HB for the valve drive cylinder 75
2, the pressure switching valve interposed in HA2 is switched so that pressure is supplied to the pressure chamber 75d of the cylinder 75 and the pressure chamber 75c is opened, and the pressure switching valve is interposed in the pipes HA3 and HB3 for the valve drive cylinder 76. The mounted pressure switching valve is switched so that pressure is supplied to the pressure chamber 76c of the cylinder and the pressure chamber 76d is opened. The operating state of each of the valve body driving cylinders 75 and 76 is called a locked state.

In such a state, the valve drive cylinder 7
4 is moved upward, the operating rod 74a is moved upward, and the operating rod 75 connected to this operating rod 74a is moved.
a moves up. Since the valve body driving cylinders 75 and 76 are in the locked state, respectively, the upward movement of the operating rod 75a causes the valve body driving cylinders 75 and 76 to move upward as they are, the operating rod 76a upwardly moves, and the stem 20 springs. The valve body 14 moves upward against the elastic force of 19, and the valve body 14 is opened.

Further, a pipe HA for the valve body driving cylinder 74 is provided.
1, HB1 is switched so that the pressure is supplied to the pressure chamber 74c of the cylinder and the pressure chamber 74d is opened, and the valve body driving cylinders 74 and 75 are switched.
The operation state of the above is continuously set to the above-described lock state. In such a state, the piston 74b of the valve body driving cylinder 74
Moves downward, the operating rod 74a moves downward, and the operating rod 75a connected to the operating rod 74a moves downward. Since the valve body drive cylinders 75 and 76 are in the locked state, the valve body drive cylinders 75 and 76 respectively move down by the downward movement of the operating rod 75a, and the operating rod 7
6a moves down, the stem 20 moves down, and the valve body 14 is closed.

When the valve element 14 is driven by the valve element driving cylinder 75, the piston 75b of the valve element driving cylinder 75
Is moved up or down to lock other valve body driving cylinders 74 and 76 which are not involved in driving the valve body 14, thereby similarly opening and closing the valve body 14. Also,
When the valve element 14 is driven by the valve element driving cylinder 76, the piston 76b of the valve element driving cylinder 76 is moved up or down to move the other valve element driving cylinders 74 and 75 that are not involved in driving the valve element 14. By setting the lock state,
Similarly, the valve element 14 is opened and closed.

In FIG. 2, the (lower) closing described on the side of each of the valve body driving cylinders 74, 75, 76 explains that the piston is moved downward to bring the valve body into a closed state. Opening (up) explains that the piston is moved upward to open the valve body. When the control computer 7 selects the valve body drive cylinders 74, 75, and 76 according to the required opening degree of the valve body 14 and outputs a valve body open / close signal, the selected valve body drive cylinder operates. And
This is a mechanism for opening and closing the valve element 14. When the control computer 7 outputs an open / close signal as an intermittent signal (pulse), the small stroke valve drive cylinder 74 opens and closes a long pulse and a short pulse in accordance with the length of the signal. In this case, as shown in FIG. 8, the valve element 14 is not opened until the small stroke of the valve element drive cylinder 74 is at the raised position, which is the original stroke, and the valve element 1 is controlled by the open signal time.
4 can be changed. Thus, a synergistic effect with the effect of the notch 14a of the valve element 14 described with reference to FIG. In this case, in FIG. 7, b is the lower edge position of the valve element 14 when the valve element 14 is opened by the valve element driving cylinder 74 having the “small” stroke;
c is the lower edge position of the valve element 14 when the valve element 14 is opened when the "long pulse" is performed by the valve element driving cylinder 74, and d is the valve when the "short pulse" is performed. Hc is the “small” stroke, _HL is the “long pulse” stroke, and Hs is the “short pulse” stroke when the body 14 is opened.

In FIG. 8, e is a lower edge position when the valve element 14 is closed. Thus, the valve element 14 is
The stroke can be controlled in five stages of large, medium, small, long pulse, and short pulse, and high-precision flow control, which conventionally required a considerable amount of time for manual work, can be mechanized. Whether or not the weighed weight of the object to be weighed has reached a predetermined value is determined by the control computer 7 based on a signal output from the weighing scale 6, and the valve body driving cylinders 74, 75, 76 are controlled. The five degrees of opening of the valve element 14 can be set by omitting a part thereof through setting means to be described later, depending on the required weighing accuracy and the properties of the material to be handled as required. In this case, the control computer 7 is instructed to make the setting.

Next, the configuration of the dust collector 11 will be described. As shown in FIG. 1, a duct 79 provided with a plurality of intake ports 79a on the inner peripheral side is provided on the inner peripheral upper surface of the annular drain pan 46. Further, a bellows-shaped hood 77 having a lower end fixed to the inner periphery of the upper end of the duct 79 and capable of vertically expanding and contracting for dust collection is provided. And a dustproof plate 78 provided with an opening 78a facing the lower end opening of
Elevating cylinder 80 whose base end is fixed to the upper end of duct 79
It is supported and provided. In the case of dust collection, hood 7
7 is extended upward by a hood raising / lowering cylinder 80 operated by a command from the control computer 7, and the dustproof plate 7
8 moves upward to the state shown in FIG. The duct 79 is provided with a plurality of intake ports 79a on the inner peripheral side thereof, and collects droplets of the object to be weighed which have been generated during weighing. In addition,
The duct 79 is connected to the dust collecting device 11 by a pipe 81.

On the other hand, the control computer 7
As shown in the control block flow shown in FIG. 5, the operation of the arm drive mechanism 38 of the dispenser unit 2 and the operation of the valve body opening / closing drive mechanism 42, the prescription (name of the object to be weighed, the mixing order,
The required weighing weight, weighing accuracy, judging the suitability of the tare weight of the weighing container 5, selecting the opening of the valve element 14, selecting the arm 25 to be used, and a method of handling abnormal operation.
Can be registered / changed, and the input control device 9 and the arm drive mechanism 3 can be registered via the interface unit 8.
8. Setting of operating conditions of the gas introduction device 10, the valve body opening / closing drive mechanism 42, and the dust collection device 11, timing instruction, or direct control. Output signals from the respective control devices and mechanisms are transmitted to the control computer 7 as electric signals, and the weighing results (names of objects to be weighed, measured weights, etc.) are stored. .

The operation of each control device and each mechanism described above is performed by calling the arm 25 output from the control computer 7,
Control is performed, for example, as shown in Table 1 according to the return signal or the opening / closing operation signal of the valve element 14. The interface unit 8 serves as an interface between the control computer 7, the input control device 9, the arm drive mechanism 38, the gas introduction device 10, the valve opening / closing drive mechanism 42, and the dust collector 11. Instead of the electric signal to be used, a continuous or intermittent electric or pneumatic signal suitable for controlling each of the above-described control devices and mechanisms is output as instructed by the control computer 7. Note that a main control device is constituted by the control computer 7 and the interface unit 8.

The weighing control device 12 displays the measured value and calculates an average value from the measured value from the weighing scale 6 per unit time by setting a zero point, taring, and a unit time according to a command from the control computer 7. To the control computer 7. The weight measurement control device 12 and the weigh scale 6 constitute a weight measurement device. Here, a mechanism for introducing gas into the inlet inclined portion 47 and the bottom near the valve element 14 will be described.

The control block flow of this embodiment is as shown in FIG. 20 described above. When the valve opening / closing signal is output from the control computer 7 via the interface unit 8, the gas introducing device 10 causes the valve opening / closing Gas is sent to the gas blowers 50 and 51 according to the signal as shown in Table 1. As shown in FIG. 21, the gas introduction device 10 is responsible for controlling the supply timing, pressure, and flow rate of the gas, and the gas ejection method (continuous or intermittent ejection, ejection order of the gas chamber).
And a vibrator 82 to be described later attached to the metering valve 1 and the like. The gas introduction device 10 is, specifically, shown in FIG.
A pulse is generated at the same timing according to the open signal of the valve element 14 in a circuit as shown in FIG. In this case, in the present embodiment, the gas from the gas blower 50 is constantly supplied to the lowermost gas chamber 50 of the inlet inclined portion 47.
a, the gas chamber 50b, the gas chamber 50c, and the gas chamber 50d in this order.
It is devised to start blowing intermittently and to increase the effect. The gas blower 51 is provided in the gas chambers 51a and 51b shown in FIG.
Gas is intermittently blown out sequentially from the side closer to 4. A vibrator 82 driven by electricity or air (air in this embodiment) is provided at the bottom of the gas blower 51, and is configured to apply vibration to the gas blower 51. In particular, in the gas blowers 50 and 51, it was confirmed in experiments that the intermittent use of gas is more effective than the case of continuous use. on the other hand,
When the vibrator 82 is used at the bottom in the vicinity of the valve body 14, the vibrator 82 has a sufficient blocking prevention effect to convey a powder having a relatively large specific gravity.

Referring to FIG. 23, the effects based on the structure in which the gas is blown out intermittently by the gas blower 51 and the structure in which vibration is applied to the gas blower 51 by the vibrator 82 will be described. That is, in FIG. 23A, the gas blowing device 51 continuously blows out the blockage preventing gas, and the vibrator 82
This indicates a case where no vibration is applied by airflow, air blow-through occurs as shown in the figure, and a mountain of the object to be weighed such as a granular material is formed, and the mountain often falls at once.

FIG. 23 (B) shows a case where gas is intermittently blown out by the gas blower 51 and vibration is applied by the vibrator 82. As shown in FIG. Because we cannot pile up weighing objects such as body,
It becomes smooth and easy to flow. Next, a high-precision measurement method based on such a configuration will be described. If no accuracy is required, some operations may be omitted. (A) First, work procedures are set in the control computer 7 and each control device thereunder. In this setting, the operation of the arm drive mechanism 38 of the dispenser unit 2 and the operation of the valve body opening / closing drive mechanism 42, the prescription (name of the object to be weighed, mixing order, required weighing weight, weighing accuracy, determination of suitability of the tare weight of the weighing container 5) , Selection of the opening of the valve element 14, selection of the arm 25 to be used, a method of handling abnormal work, etc.) and the control computer 7.
The closing control when any one of the five stages (large, medium, small, long pulse, short pulse) of the "open" or "close" signal is output via the interface unit 8 through the interface unit 8 For example, there are various conditions as shown in Table 1, such as the operation of the device 9, the gas introduction device 10, and the dust collection device 11.

When a long pulse or short pulse signal is output to the metering valve 1, the operation of the charging device 4
Whether or not to perform gas blowing from the gas blowing devices 50 and 51, operation of the vibrator 82, operation of the dust collection mechanism, and the like, and the operating conditions thereof differ depending on the properties of the particles to be handled, and are determined in advance by experiments. When the above setting is performed, the control computer 7 sends a zero-point setting instruction to the weighing control device 12, and when a zero-point setting confirmation signal is obtained, a message is displayed. When the worker places the weighing container 5 on the weighing scale 6 according to the message, the control computer 7 compares the preset weight information of the weighing container 5 with the actually measured weight sent from the weighing control device 12, If it is determined to be correct, the operation waits for an instruction from the operator. If not, a warning is displayed.

Referring to FIG. 20, when the above-mentioned operating conditions are set, the procedure management means 85 in the control computer 7 first sends a start signal to the weight measurement control means 86. The weight measurement control unit 86 issues an instruction to set a zero point via the A / D conversion unit 95 to the weight measurement control unit 12.
When the confirmation signal of the zero point setting is obtained, a completion signal of the zero point setting is sent to the procedure management means 85. Procedure management means 85
Displays a message and informs the weight measurement control means 86 of the weight of the weighing container 5. The weight measurement control means 86
Weight information of the set weighing container 5 and weight measurement control device 1
2 is compared with the actually measured weight obtained by A / D conversion through the A / D conversion means 95, and a signal indicating whether or not the correct weighing container 5 is placed on the weighing scale 6 is obtained. The command is sent to the procedure management means 85 and if correct, the weight measurement control device 12 is instructed to set the measured weight of the weighing container 5 to the tare weight and to send a tared weight signal thereafter. To the means 88 sequentially. When the correct weighing container 5 is put on the weighing scale 6, the procedure management unit 85 waits for an instruction from the operator. If not, a warning is displayed.

(B) Next, the operator operates the control computer 7
To start weighing. The instruction to start the weighing given to the control computer 7 is transmitted to the arm drive mechanism 38 of the target weighing valve 1 via the interface unit 8, and the selected arm 25 is drawn to the center of the dispenser unit 2 by the cylinder 39. Can be

Referring to FIG. 20, the procedure management means 85 sends an operation signal to the target arm drive mechanism 38 of the metering valve 1 via the interface unit 8, and attaches and detaches the valve of the control computer 7. Confirmation means 8
An ON signal is sent to a timer 90 of No. 9 to start the timer 90 and set an allowable time in the comparison operation means 91. (C) Next, the proximity switch 70 in the valve body opening / closing drive mechanism 42 causes the arm 25 to move and the stem 20 of the valve body 14 to move.
Sends a confirmation signal to the control computer 7 indicating that the head 21 has come to a predetermined position.
An operation signal is output to the clamp drive cylinder 71 of the valve body opening / closing drive mechanism 42, and the clamp 72 grips the head 21 of the stem 20. If the head 21 of the stem 20 does not reach the correct position, an interlock circuit is provided in the interface unit 8 so that the clamp 72 does not operate.

Referring to FIG. 20, the proximity switch 70 sends a confirmation signal indicating that the arm 25 has moved and the head 21 of the stem 20 of the valve body 14 has reached a predetermined position.
Sends to the comparison operation means 91 of the valve attachment / detachment confirmation means 89, the comparison operation means 91 compares the set time with the time from the timer 90, and sends the result to the procedure management means 85,
A reset signal is sent to the timer 90. Procedure management means 85
Indicates that the head 21 of the stem 20 has not reached the correct position if it is within the set time, and displays a warning to the operator,
A command to return 5 to the original position is sent to the arm drive mechanism 38.

(D) When the preparation of the valve body opening / closing drive mechanism 42 is completed as described above, the control computer 7 sends the input device 4, the gas introduction device 10, and the dust collection device 11 via the interface unit 8. On the other hand, an operation signal as shown in Table 1 is output, and each control device is connected to the input device 4,
The respective devices such as the gas introducing device 10 and the dust collecting device 11 are started to operate according to preset conditions.

At the same time, the control computer 7 sends an opening / closing signal for the valve 14 to the valve opening / closing drive mechanism 42 via the interface unit 8. The opening / closing signal of the valve element 14 is obtained by a process previously input to the control computer 7 by an operator,
It is controlled by the prescription, and the opening of the valve element 14 is controlled so as to gradually decrease in five stages according to the accumulated weight.

During the weighing, the data of the accumulated weighed weight is transmitted from the weighing scale 6 to the control computer 7 via the weighing control device 12 every time, and the control computer 7 transmits the data according to the data of the accumulated weighed weight. The five degrees of opening of the valve element 14 are selected, and a control signal is continuously sent to the valve element opening / closing drive mechanism 42. That is, when the operator sets the process and the prescription in the control computer 7, it is necessary to determine how much the remaining weight with respect to the target value is to be set. Is "large" opening,
Medium opening up to 150g remaining weight, 30g remaining weight
Up to a "small" opening, a "long pulse" up to the remaining weight of 5 g, and a "short pulse" up to the target value thereafter. The set valve body 14 opening / closing operation signal is output, and each of the valve body drive cylinders 74, 75, 76 is operated.

When the cumulative weighed weight sent from the weigh scale 6 to the control computer 7 via the weighing control device 12 reaches or exceeds a predetermined target value, the valve body opening / closing drive mechanism 42 A signal to close the valve body 14 is sent.
The operation in which the control computer 7 sends an opening / closing signal of the valve element 14 to the valve element opening / closing drive mechanism 42 will be described with reference to FIG. The selection criteria for the opening degree of the valve 14
7 is set in the cylinder selection means 92, and the target weighed weight is set in the comparison calculation means 88. That is, the valve element 1
The selection criterion for the opening of No. 4 determines which setting opening is to be set up to the remaining weight with respect to the target value as described above.

Comparison operation means 88 of valve element opening / closing control means 87
Compares the cumulative weighed weight of the weight measurement control device 12 sent from the weight measurement control means 86 with the target weighed weight, and sends the deviation to the cylinder selection means 92. The cylinder selecting means 92 selects the valve body driving cylinders 74, 75, 76 according to the set conditions according to the deviation given from the comparison calculating means 91, and at that time continuously opens and closes the valve body 14. Information on whether to perform pulse control (intermittently open or close) is given to the pulse selecting means 93.

The pulse selection means 93 is used for pulse control based on the information given from the cylinder selection means 92.
When pulse control is performed by determining that the pulse is unnecessary, the type of the pulse (pulses having different opening times) is designated to the pulse generating means 94. When pulse control is not performed, a valve opening / closing signal is directly sent to the interface unit 8. The pulse generator 94 outputs the pulse specified by the pulse selector 93 and outputs an open / close signal to the interface unit 8.

The interface unit 8 converts the valve opening / closing signal from the pulse selecting means 93 or the pulse generating means 94 into an air signal. This includes three 5-port two-way spring-return solenoid valves or four-port two-way spring-return solenoid valves that send open or closed air signals to large, medium, and small valve drive cylinders 74, 75, and 76, respectively. Simple configuration.

In this way, the five-stage valve body opening is selected according to the accumulated weighed weight, and the valve body opening / closing drive mechanism 42 is selected.
, The control signal is continuously transmitted. The comparison calculating means 88 of the valve element opening / closing control means 87 sends a weighing completion signal to the procedure management means 85 when the cumulative weighed weight sent from the weight measurement control means 86 has reached a predetermined weighing value or more. And the cylinder selecting means 92 sends a closing signal of the valve element 14 to the valve element opening / closing drive mechanism 42 via the pulse selecting means 93 based on the deviation signal.

(E) Next, when the weighing is completed as described above, the procedure management means 85 of the control computer 7
Signals for returning the clamp 72 and the arm 25 to the origin are sequentially transmitted to the arm driving mechanism 38 and the valve body opening / closing driving mechanism 42
And the valve element 14 returns to the initial state from the central part of the dispenser unit 2. When a plurality of objects to be weighed are blended in the same container, the operation from the above-mentioned instruction to start the weighing of the control computer 7 to the above-mentioned ending of the weighing is repeated.

Next, the structure and operation of the gas introducing device 10 shown in FIGS. 21 and 22 as the gas introducing means will be described. In FIG. 21, a distribution circuit 105 connected to a fluid source includes a filter FO, a pressure reducing valve RO, a main switch SWO, a fluid pressure control valve VO, and the like. Fluid from the fluid source is distributed by the distribution circuit 105. It is supplied to each circuit.

Further, the pressure flow control circuit 106 includes a main switch S for supplying gas to the pressure reducing valve R 1 and the gas blower 50.
W1, start / stop manual main switch S for pulse generation
W11, a main switch SW21 for supplying gas to the gas blower 51, a main switch SW31 for the vibrator 82, and the like are used to adjust each pressure source, pressure, and flow rate.

Then, the pulse timing signal generating circuit 9
6, a fluid signal from the main switch SWO is input to a start / stop switch SW11 for pulse generation, and is input to the P port of the switching means V9 via the switch SW11. To the second supply path i. When the pulse timing signal generation circuit 96 is automatically activated in this state, the automatic control signal passes through the OR element 1A1 and the Z control of the switching means V9.
The input is made to the port, the operation port of the switching means V9 is switched, and the fluid is sent from the P port (input) of the switching means V9 to the first supply path h of the pulse timing signal generating circuit 96 described later. You. In the case of manual activation, by turning on the manual switch SW2, a fluid signal is transmitted to the Z port of the switching means V9,
This is performed by switching the switching means V9.

The pulse timing signal generation circuit 96 includes:
A fluid pressure control valve V5 is provided, which can be switched between an open state in which the upstream flow path and the downstream flow path communicate with each other and a closed state in which the upstream flow path is closed and the downstream flow path is opened by a fluid control signal. The output flow path a and an open state that connects the upstream flow path and the downstream flow path from a closed state in which the upstream flow path is closed and a downstream flow path is opened after a predetermined time when a fluid pressure signal is transmitted. The opening control flow path b for transmitting a fluid control signal for opening the fluid pressure operated valve V5 to the fluid pressure operated valve V5, which is sequentially provided with a delay valve T1 which is switched to the open state and an OR element OR1 having the other input port. A first output unit A comprising a fluid control signal for closing the fluid pressure control valve V5 and a closed control flow path c for transmitting the fluid control signal to the fluid pressure control valve V5.

The pulse timing signal generation circuit 96
The fluid pressure control valve V6 (which can be switched between an open state in which the upstream flow path and the downstream flow path are communicated with each other and a closed state in which the upstream flow path is closed and the downstream flow path is opened by a fluid control signal. V7, V8), and a closed state in which the upstream flow path is closed and the downstream flow path is opened after a predetermined time when the fluid pressure signal is transmitted, from the closed state where the upstream flow path and the downstream flow path are opened. A delay valve T2 (T3, T4) that is switched to an open state communicating with the flow path is provided.
6 (V7, V8), an open control flow path d for transmitting a fluid control signal for opening the fluid pressure control valve V6 (V7, V8).
And a closed control flow path for transmitting a fluid control signal for closing the fluid pressure control valve V6 (V7, V8) from the outlet of the OR element OR2 (OR3, OR4) to the fluid pressure control valve V6 (V7, V8). e, a plurality (three) of second output units B
Are provided.

The pulse timing signal generating circuit 96
, The hydraulic pressure control valves V5 to V8 of the output units A and B
A fluid pressure signal passage f branched from the downstream output passage a and transmitting a part of the fluid in the output passage a as the above-described fluid pressure signal to the delay valves T1 to T4 of the next output units A and B is provided. Have been. Further, between the first output unit A and the next second output unit B, the closed control flow path c of the first output unit A is located downstream of the fluid pressure control valve V6 of the second output unit B. Branched from the output flow path a, between the remaining output units, that is, between the second output units B, and finally between the second output unit B and the first output unit A.
And a closed control flow path g branched from the output flow path a downstream of the fluid pressure control valves V7, V8, V5 and reaching the OR elements OR2, OR3, OR4 inlet of the previous output unit B. Further, there is provided the switching means V9 for selectively connecting the flow path from the fluid source to one of the first supply path h and the second supply path i and opening the other supply path which is not selected. Have been. Further, the first supply path h communicates with the open control flow paths b and d upstream of the delay valves T1 to T4 of the output units A and B and the output flow path a upstream of the fluid pressure control valves V5 to V8, and A reset flow path j is provided for communicating the second supply path i with the other inlets of the OR elements OR1 to OR4 of the output units A and B.

In the pulse timing signal generating circuit 96 having such a configuration, the switching means V9 and the second
The fluid pressure of the fluid source is applied to the OR elements OR1 to OR4 of the output units A and B via the supply path i and the reset flow path j. The fluid pressure is transmitted to the fluid pressure control valve V5 via b as a fluid control signal for opening the fluid pressure control valve V5 of the first output unit A. In the second output unit B, OR elements OR2 to OR4
The fluid pressure is transmitted to the fluid pressure control valves V6 to V8 as a fluid control signal for closing the fluid pressure control valves V6 to V8 of the second output unit B via a closed control flow path e.
Therefore, the fluid pressure control valve V5 of the first output unit A is open, and the fluid pressure control valves V6 to V8 of the second output unit B are closed.

When the switching means V9 is switched in this state, the second supply path i is cut off from the fluid source, the first supply path h communicates with the fluid source, and the second supply path i is opened. As a result, the fluid pressure of the fluid source is lost. The fluid pressure from the fluid source is supplied from each of the delay valves T1 to
Each of the fluid pressure control valves V5 to V5 through T4 and the output flow path a
8 is transmitted.

Since the fluid pressure control valve V5 of the first output unit A is open, the fluid of the fluid source is output to the output flow path a downstream of the fluid pressure control valve V5 of the first output unit A. You. Then, a part of the fluid is transmitted as a fluid pressure signal to the delay valve T2 of the next second output unit B in the fluid pressure signal passage f branched from the output passage a. The delay valve T2 of the second output unit B to which the fluid pressure signal has been transmitted changes from the closed state after a predetermined time to the second output unit B.
Is switched to an open state in which the upstream side and the downstream side of the open control flow path d communicate with each other, and the fluid pressure in the open control flow path d reaching the delay valve T2 is set to the fluid pressure operation valve V6 in the open state. The signal is transmitted to the fluid pressure control valve V6 of the second output unit B as a signal.

When the fluid pressure control valve V6 is in the open state, the fluid of the fluid source is supplied to the fluid pressure control valve V6 of the second output unit B.
Output to the downstream output flow path a. A part of the fluid flows through a closed control flow path c and a fluid pressure signal flow path f branched from the output flow path a, and one of the fluids flows to the fluid pressure operation valve V5 of the first output unit A. The signal is transmitted as a fluid control signal for closing V5, and the other is transmitted as a fluid pressure signal to the next delay valve T3 of the second output unit B. As a result,
The fluid pressure control valve V5 of the first output unit A is closed, the fluid output from the output flow path a of the first output unit A is stopped, and the delay valve T3 of the next output unit B is opened after a predetermined time. State.

Similarly, the delay valve T3 of the output unit B (B, A, B,...) To which the fluid pressure signal has been transmitted.
(T4, T1, T2...) Outputs the fluid control signal to the output unit B (B, A, B...) Via the open control flow path d (d, b, d. ) Fluid pressure control valve V7
(V8, V5, V6...) To be opened, and the opened hydraulic pressure control valve V7 (V8, V5, V6...)
Outputs the fluid of the fluid source to the downstream output flow path a,
A part of the fluid flows into the closed control flow path g · e (ge · e,
g, e, c...) and the fluid pressure signal flow path f, one of which is the fluid pressure control valve V6 (V7, V8, V5...) of the previous output unit B (B, A, B. ..) is transmitted as a fluid control signal to close the other, the other being the next output unit B
(B, A, B...) Delay valve T4 (T1, T2,
T3...) As a fluid pressure signal,
A pulse signal is output via the output channel a of each of the output units A and B.

When the switching means V9 is switched again while the pulse signal is being output through the output flow path a of each of the output units A and B, the first supply path h is cut off from the fluid source. , The second supply path i and the fluid source are in communication with each other, the first supply path h is opened and the fluid pressure of the fluid source is lost, the output of the pulse signal is stopped, Of the second supply passage i and the reset passage j of each of the output units A and B and the OR element O
It is transmitted to the fluid pressure control valves V5 to V8 of the output units A and B via R1 to OR4, the fluid pressure control valve V5 of the first output unit A opens, and the fluid pressure control valves V6 to V2 of the second output unit B. V8 is closed.

Therefore, in the pulse timing signal generation circuit 96 having such a configuration, when restarting, the pulse generation is always started again from the first output unit A in order and the fluid is output from each of the output units A and B. At the same time, one is transmitted as a fluid control signal for closing the fluid pressure operation valve of the previous output unit via the closed control channels c, e, g and the fluid pressure signal channel f, respectively, and the other is transmitted as the next output signal. Since the fluid pressure signals are transmitted to the delay valves of the units, the fluid output times of the output units A and B do not differ, and pulse signals of the same period are adjusted by adjusting the delay valves T1 to T4 of the output units A and B. Output unit A,
B and the pulse period from each of the output units A and B can be changed.

Further, since the fluid pressure control valves V5 to V8 close the upstream output flow path a and open the downstream output flow path a in the closed state, the output destination of the pulse signal is a closed system. Even when the fluid control signals are sent to the fluid pressure control valves V5 to V8 via the open control flow paths b and d, and the fluid pressure control valves V5 to V8 are opened, the downstream side of the next output unit is opened. The fluid pressure control valves V5 to V8 branched from the output flow path a
Since there is no fluid pressure remaining in the closed control flow paths c, e, and g for sending a closed fluid control signal to the
V8 can be opened smoothly.

The delay valve T1 in the above description
There are various T4 to T4, for example, as shown in FIG. This is because the throttle valve 201 and the accumulator 2
02 and a three-port two-way spring return type fluid pressure operated valve 203 are connected in series.
When the fluid pressure signal continues to be transmitted from the connection port Z on the first side, the pressure in the accumulator 202 increases to a required pressure after a predetermined time, and as a result, the first port P of the fluid pressure actuated valve 203 is increased.
Is closed and the second port A is switched from a closed state in which the second port A is opened via the third port R to an open state in which the first port P and the second port A are communicated.

Next, another structure of the gas introducing device 10 and its operation will be described. 21 and 22, an operation timing selection circuit 97 includes an OR circuit 98 including two OR elements 1A1 and 1A2, and an OR element 1
A3, a selection circuit 104 including a solenoid valve V91, and OR
A selection circuit 99 including an element 2B1 and a solenoid valve V95;
OR elements 2A1-2A4 and solenoid valves V92, V93, V9
4 and a selection circuit 102 comprising Note that manual ON / OFF switches SW12, SW22, and SW32 are provided for the respective selection circuits 104, 102, and 99.

The air signal for opening and closing the valve element 14 is branched and input to the gas introduction device 10 as a timing signal. That is, any opening degree of the valve body 14 (large,
Even if an open signal (medium, small, long pulse, short pulse) is issued, the OR circuit 98 is operated so that the pulse timing signal generation circuit 96 is activated while the open signal is issued. Accordingly, the opening signal of any of the above-described opening degrees of the valve element 14 is transmitted to the switching means V9 of the pulse timing signal generation circuit 96 via the solenoid valve V91 of the selection circuit 104, so that the pulse timing signal generation circuit 96 can be operated. It has become.

Similarly, an opening signal of any opening degree of the valve element 14 is also supplied to the selection circuit 99 for supplying the working gas to the vibrator 82 via the amplification circuit 100 comprising a fluid pressure operation valve. I have. Similarly, an opening signal of any opening degree of the valve element 14 is supplied to the selection circuit 102 for supplying the gas to the gas blower 51. The pulse output from the pulse timing signal generation circuit 96 is supplied as a timing signal to the pulse amplification circuit 101 including the fluid pressure control valves V10 to V13. Each of the fluid pressure control valves V10 to V13 of the pulse amplification circuit 101 is opened and closed by this timing signal, and the pressure / flow rate control circuit 106
Gas pipes 1A-1 to 1A- that intermittently (intermittently) communicate gas from the gas chambers 50a to 50d of the gas blower 50.
4 Further, the pulse timing signal generation circuit 9
The first and second pulse signals a1 and b1 of FIG. 6 are branched and supplied as a timing signal to an amplifier circuit 103 composed of a fluid pressure control valve via solenoid valves V93 and V94 of a selection circuit 102. Gas pipes 2A-1, 2A-2 communicating with gas chambers 51a, 51b of gas blower 51
To be supplied intermittently.

Each of the above amplifier circuits 100 and 103 has
Based on the timing signal, each fluid pressure operation valve of the amplification circuit is opened and closed to cut off the gas from the pressure / flow control circuit 106, thereby amplifying the flow rate and / or pressure of the timing signal. is there. The selection circuits 104, 102, and 99 of the operation timing selection circuit 97
An electromagnetic valve V91 that operates based on a command from the control computer 7 for each of the pulse timing signal generation circuit 96, the amplification circuit 103 that supplies gas to the gas blower 51, and the amplification circuit 100 that supplies working gas to the vibrator 82. ~ 9
5 stops the supply of various timing signals,
It has the following functions.

That is, the selection circuit 97 for the pulse timing signal generation circuit 96 for supplying gas to the gas blower 50 is provided with a manual ON signal or an open signal of the valve element 14 (large, medium, small, long pulse, short pulse). ) Is selected as a start signal or not. When the open signal of the valve element 14 is selected, the gas is intermittently supplied to the gas blower 50 while the valve element 14 is open. When the manual ON signal is selected, regardless of the opening and closing of the valve body 14,
The gas is supplied to the gas blower 50 intermittently.

On the other hand, the selection circuit 102 for the amplification circuit 103 for supplying gas to the gas blower 51 is provided with the first and second pulses a1 and b of the pulse timing signal generation circuit 96.
1. Select either the open signal (large, medium, small, long pulse, short pulse) of the valve element 14 or a manual ON signal as a start signal. When the manual ON signal is selected, The gas blower 51 regardless of the opening and closing of the valve element 14
Gas is continuously supplied to the valve body 14 and the opening signal (large,
When medium, small, long pulse, or short pulse is selected, the gas is continuously supplied to the gas blower 51 while the valve body 14 is open. When the first and second pulses a1 and b1 of the pulse timing signal generation circuit 96 operating based on the opening signal of the valve body 14 are selected, the valve body 14 is connected to the gas blower 51 as described above. Gas is supplied intermittently during opening.

Further, the selection circuit 99 for supplying the working gas to the vibrator 82 through the pipe 2B is provided with a selection signal of an open signal (large, medium, small, long pulse, short pulse) of the valve body 14 or a manual ON signal. Is selected as a start signal. Similarly, when a manual ON signal is selected, the working gas is continuously supplied to the vibrator 82 regardless of the opening and closing of the valve element 14, and the valve element 14 is opened. When a signal (large, medium, small, long pulse, short pulse) is selected, the vibrator 8
2, the working gas is supplied continuously while the valve element 14 is open.

Note that manual ON / OFF switches SW12, SW2 are provided to the respective selection circuits 104, 102, 99.
2, SW32 is provided. Next, effects of the embodiment will be described. That is, according to this embodiment, the input device 4 capable of changing the supply amount is provided, and the valve element 14 attached to the support member via the pivot and moving in the substantially vertical direction to the plurality of arms 25 arranged in an umbrella shape is provided. The gas blowers 50 and 51 are attached to the inlet inclined portion 47 of each of the metering valves 1 and the lower part of the flow path near the valve element 14 on the fluid inlet side. A vibrator 82 for assisting the function and providing an appropriate vibration is provided in the metering valve 1 and the shape of the tip piece of the valve element 14 is devised.
The object to be weighed in from is almost in a floating state,
The fine flow rate can be adjusted, and the powder can be conveyed without clogging in the flow path of the measuring valve 1.

Further, as described above, the measuring valve 1 is attached to the arm 25, and the arm driving mechanism 38 for moving the arm 25 to the umbrella-shaped center portion at the time of weighing is provided. Since the valve body opening / closing drive mechanism 42 for appropriately controlling the opening of the valve body 14 of the measuring valve 1 is provided, the measurement can be performed at the same measuring position without moving the weighing container 5.

Further, in addition to the above-described configuration, by arranging the weighing scale 6 below the measuring valve 1,
A plurality of different powders can be weighed in the same weighing container 5. If necessary, a specific arm 25
Since the pipe for measuring the liquid and the measuring valve 1 are configured to be attached, the measurement including the liquid can be easily performed.

Further, in addition to the above configuration, the control computer 7 for monitoring the weighing state (set weight), comparing the current weighed value with the set weight, and feeding back a control signal to each component device is provided. Since the devices for appropriately controlling the respective devices are organically combined, the measurement can be easily performed without manual operation. In particular, since the dust collecting device 11 is provided, the measurement of the device during the measurement is performed. Sanitary weighing can be performed while protecting the surrounding environment from dirt and dust, and automation and work efficiency can be increased, which has been difficult as a high-precision weighing method.

In the above embodiment, the inlet inclined portion 47 is employed as the inclined portion provided in the flow passage extending from the fluid inlet to the position near the valve element 14 and inclined downward. Alternatively, a granular material conveying mechanism using a spring may be provided and used as an inlet inclined portion also serving as a blocking prevention mechanism. Also, vibrator 8
As the second vibration source, a vibrator or a vibration motor using a pressurized gas may be used.

Further, in the above embodiment, the structure for pressing the valve element 14 is constituted by a plurality of spring-loaded ball plungers 31 as shown in FIG.
The guide roller method as shown in FIGS. 5A and 5B may be used. In this case, an acute angle portion in which the outer peripheral portion of the guide roller 107 is formed in a convex shape with a triangular cross section is provided. This acute angle portion is formed on the inner wall surface of the plate side portion 17c of the plate member 17 by V
By engaging with the groove 108 and moving the acute angle portion along the V-shaped groove 108, the lateral movement of the plate member 17 of the operating body 15 is prevented. In addition, as shown in FIG.
09 are formed on the outer peripheral surface of the V-shaped groove 109.
The guide roller 109 formed with the V-shaped groove 109a may be moved along the protrusion 110 by engaging the protrusion 110 formed on the inner wall surface of the plate side portion 17c with a.

The pulse generation circuit for controlling the supply of gas to the gas blowers 50 and 51 is not limited to the one in the above embodiment, and a pulse generation valve as shown in FIG. 27 may be used. It may be electrically constituted by a solenoid valve or a timer. FIG. 2 shows the configuration of the pulse generating valve.
7, the pulse generating valve includes two three-port two-way spring-return type fluid pressure control valves 111 and 112 and two variable needle valves with check valves (throttle valves) as shown in the figure. And a flow control valve 113, 114 with a check valve. And this pulse generating valve is shown in FIG.
(B), (C), and (D) are operated in this order, and pulse signals are output from the actuator pipes or the output pipes A and B, respectively. It is formed integrally as shown in E).

The operation of the variable pulse generating valve will be described in detail. In the figure, P is an air pressure source connection part, and R is an exhaust part. First, in FIG. 1A, when air is fed from the air pressure source connection portion P, this air reaches the output port A via one operation valve 111 in which the port ap and the port bp communicate with each other, and at the output port A. Piping D branched from piping C
Through the flow control valve 113 with one check valve, the flow is controlled by the flow control valve 113 with check valve, and the flow is supplied to the other operation valve 112. The other operation valve 112 to which the air is supplied is operated, and the port cp and the port dp are in communication with each other as shown in FIG. In this state, the air pumped from the air pressure source connection portion P reaches the output port B via the other operation valve 112 in which the port cp and the port dp communicate. In this state, the air reaches the other flow control valve with check valve 114 via the pipe F branched from the pipe E to the output port B, and the flow is controlled by the flow control valve with check valve 114 so that one air flow is controlled. It is supplied to the operation valve 111. One of the operation valves 111 to which the air is supplied is operated, and the port ep and the port fp are in communication with each other as shown in FIG. In this state, the air pressure-fed from the air pressure source connection portion P does not reach the output port A, and the air supplied to the pipe D flows to the exhaust portion R via the operation valve 111 in which the port ep and the port fp communicate. It is exhausted. As a result, the air pressure does not act on the operation valve 112 as shown in FIG.
The port 12 is returned to a state in which the port gp and the port hp communicate with each other by the spring force.
And the air supplied to the pipe F is discharged to the exhaust part R via the operation valve 111 in communication between the port gp and the port hp. As a result, the operating valve 1
11 is returned to a state in which the port ap and the port bp communicate with each other by the spring force, and both the operation valves 111 and 112 return to the initial state of FIG.

By repeating such an operation,
A state where air is supplied from the output port A and a state where air is supplied from the output port B are intermittently obtained.
Are output as pulse signals. In this case, if the flow control valves with check valves 113 and 114 are throttled to control the flow rate to a small value, a slow pulse signal output is obtained. If the flow control valves with check valves 113 and 114 are opened to control the flow rate to a large flow rate, Thus, a fast pulse signal output can be obtained.

Next, another embodiment of the second invention will be described with reference to FIG. This metering valve 115 is provided with a valve body 116.
Is constituted by an operating section 116 constituted by a cylinder 118 in which the cylinder is housed. That is, a piston-shaped valve element 117 is slidably disposed in the main body of the cylindrical cylinder device 118, and a spring 119 for constantly urging the valve element 117 downward is disposed. The distal end of the piston rod 130 is connected to the valve body 117, and the rear end of the piston rod 130 projects upward through the upper end of the cylinder 118 main body. At the rear end of the piston rod 130, there is provided a head 120 in which a spindle cap 120a for a proximity switch and a step 120b for holding a clamp are vertically arranged. A concave portion 118a is formed at the upper end of the cylinder 118 main body, and a ring-shaped cap 121 having a support hole 121a formed to support the rear end of the piston rod 130 is fitted into the concave portion 118a. A shaft sealing oil seal 122 is interposed between the lower surface of the cap 121 and the inner bottom surface of the recess 118a.

An opening 124 is formed in the lower side wall of the cylinder 118 main body. A cylindrical portion 125 is formed integrally with the lower side wall of the cylinder 118 and extends obliquely upward with one end communicating with the opening 124. One end of a flexible pipe 126 is connected to the other end of the cylindrical portion 125. The cylindrical portion 125 is provided with a gas outlet for blowing gas from the bottom surface. In this embodiment, the gas outlet is constituted by a gas outlet pipe 127, and two gas outlet pipes 127 are mounted so as to protrude into the inside of the tubular portion 125 from the bottom side of the outer peripheral surface of the tubular portion 125. In this case, the gas blowing pipe 127 is inclined with respect to the outer peripheral surface of the cylindrical portion 125, and the tip outlet thereof is opened toward the opening 124.

A fluid discharge pipe 128 is connected to a lower end of the cylinder 118 main body. An annular end portion 129a of an arm 129 is fitted around the outer periphery of the upper end of the cylinder 118 main body.
32 is fixed. Here, the valve element 117
Is formed by integrally molding a rectangular body 117a and a rectangular cylindrical body 117b protruding from the lower end thereof. A through-hole 117c for the piston rod 130 is formed in the rectangular body 117a. . The rectangular cylinder portion 117b has a shape in which the lower end portion is cut obliquely, and the lower end surface is formed as an inclined surface. Then, the rectangular body portion 1 of the valve body 117
The side wall portion of the cylinder 118 facing the opening 124 side of the rectangular cylinder portion 117b is configured as a valve seat 123.

Since the valve body 117 is formed in a rectangular shape as described above, the cylinder body 118 is formed in a cylindrical shape having a rectangular cross section. As described above, when the valve body 117 is formed in a square shape, the opening shape through which the fluid formed by the valve body 117 and the opening 124 passes becomes a square shape, and clogging of the fluid discharged from the opening 124 occurs. This is advantageous because the problem described above is reduced. Note that the valve element 117 may be formed in a cylindrical shape, but in such a case, the distal end of the valve element 117 becomes curved, and the valve element 117 and the opening 1 are formed.
The shape of the passage opening formed by the opening 24 becomes substantially crescent-shaped, and a problem such as clogging of the fluid discharged from the opening 124 easily occurs.

Further, a gas pressure feed hole 131 penetrating from the outer surface to the inner surface of the cylinder 118 main body wall is formed at the boundary between the cylindrical portion on the upper side of the cylinder 118 main body and the cylindrical portion 125. This is to pump gas into the space P in order to prevent a fluid (for example, a granular material) whose flow rate is controlled from entering the space P above the valve body 117 of the cylinder 118 main body.

Even with the metering valve 115 having such a configuration, fine flow control can be performed similarly to the previous embodiment, and the flow path of the metering valve 115 does not become clogged with powder or the like. In addition, the valve bodies 14 and 11 in each of the above-mentioned embodiments are used.
The opening / closing drive mechanism 7 is not limited to the cylinder device, and may be one shown in FIG.

The opening / closing drive mechanism 138 shown in the figure can be formed integrally with the valve body. That is, the opening / closing drive mechanism 13
Reference numeral 8 denotes a plunger 132 cooperating with a valve element (not shown), a bearing 133 supporting both ends of the plunger 132, a coil 134 provided on the outer periphery of the plunger 132, and a yoke 13.
5, a closing spring 136 for urging the valve body in a closing direction, and an adjuster 137 for adjusting the operating force of the closing spring 136. When the coil 134 is energized, the electromagnetic force Fm acts on the plunger 132. Then, the valve body is displaced upward to open the valve.

The detection element 139 detects the level of the control object, for example, the level of the liquid surface, and the state quantity of the control object such as the weighed value or the discharge amount. In this case, the opening / closing drive mechanism 13
8 is a detection circuit 141 that detects the signal of the detection element 139 and converts it into a signal that can be calculated.
And a comparator 142 that compares the detection signal from the detection circuit 141 with the setting signal, converts the detection signal into a deviation signal and outputs the deviation signal, and calculates a large, medium, and small deviation amount based on the deviation signal from the comparator 142. A level determination circuit 143 that determines and outputs the three levels, a linear control circuit 144, a first pulse control circuit 145, a second pulse control circuit 146, and a level determination signal from the level determination circuit 143. And a switch 147 for inputting a deviation signal to one of the linear control circuit 144, the first pulse control circuit 145, and the second pulse control circuit 146.

In the level determination circuit 143, for example, when the detection element 139 is a weight measuring device, the weight detection signal is
The signal is converted into a deviation signal from the detection circuit 141 via the comparator 142 and transmitted. This deviation amount is determined by the level judgment circuit 14.
In 3, the level is determined to have three levels of large, medium, and small. If the level is determined to be large, the deviation signal is input to the linear control circuit 144. The linear control circuit 144 supplies a linear control signal to the coil 134, and the position of the valve body is controlled according to the deviation between the detected value and the set value.

When the level determination circuit 143 determines that the deviation amount is a medium level, the deviation signal is input to the first pulse control circuit 145, and the coil 134 is supplied with a long pulse signal corresponding to the deviation signal. The valve is opened and closed continuously as in the case of the long pulse. Further, when the level determination circuit 143 determines that the deviation amount is a small level, a deviation signal is input to the second pulse control circuit 146 and the coil 13
4 is supplied with a sheet pulse signal corresponding to the deviation signal, and the valve body is reciprocated between a closed position and an open position through which fluid flows only through the notch formed in the valve body as in the case of the short pulse. It is opened and closed continuously.

As described above, the present invention has been described with reference to the specific embodiments. However, the present invention is not limited to these embodiments, and is attached to the present invention by a person skilled in the art. It should be noted that various changes and modifications can be made without departing from the scope of the claims.

[0116]

As described above, according to the present invention,
An inclined portion having an inclined flow path bottom surface extending from the fluid inlet to a position near the valve body, and a gas outlet provided at a lower part of the flow path near the valve body on the fluid inlet side or a gas outlet for blowing gas from the bottom surface of the inclined portion. Gas is supplied to the gas outlet at least by the valve body.
And a gas introducing means for intermittently or continuously introducing the opening that is opened and closed by the opening , so that a solid-containing fluid such as a powder, a slurry, etc. It can be brought to a state close to a floating state, and by using a configuration in which the valve body is moved in a substantially vertical direction to open and close the opening , it is possible to easily adjust the minute flow rate of the solid-containing fluid, etc. It is of great utility to provide a discharge control valve capable of performing control with high accuracy.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a dispensing apparatus showing one embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the embodiment.

FIG. 3 is a view showing a valve body operating portion in the embodiment.
(A) is a front view, (B) is a cross-sectional view taken along the line AA in (A).

FIG. 4 is a sectional view taken along the line BB in FIG. 3 (B).

FIG. 5 is a sectional view taken along the line CC in FIG.

FIG. 6 is an enlarged sectional view of a ball plunger.

FIG. 7 is a view showing a configuration of a valve body, (A) is a front view,
(B) is a side sectional view

FIG. 8 is a front view illustrating the action of the notch in the valve body.

FIG. 9 is a diagram showing a configuration of a valve body, (A) is a front view,
(B) is a side view, (C) is a side sectional view.

10A and 10B are diagrams illustrating another configuration of the valve body, where FIG. 10A is a front view, FIG. 10B is a side view, FIG. 10C is a side cross-sectional view, and FIG.

FIG. 11 is a view showing a configuration of another embodiment of the valve body, and FIG.
Is a front view, (B) is a side view, (C) is a side sectional view,
(D) is a bottom sectional view

FIG. 12 is a diagram showing a configuration of another embodiment of the valve body, and FIG.
Is a front view, (B) is a side view, and (C) is a side sectional view.

FIG. 13 is a view showing a configuration of another embodiment of the valve body, and FIG.
Is a front view, (B) is a side view, and (C) is a side sectional view.

FIG. 14 is a view showing a configuration of another embodiment of the valve body, and FIG.
Is a front view, (B) is a side view, and (C) is a side sectional view.

FIG. 15 is a view showing another example of the notch of the valve body.

FIG. 16 is a cross-sectional view showing the configuration of the entrance inclined portion of the embodiment.

FIG. 17 is a cross-sectional view illustrating a configuration of another example of the inlet inclined portion.

FIG. 18 is a cross-sectional view showing a configuration of a gas blower provided in a lower part of a flow path near a valve body in the embodiment.

FIG. 19 is a diagram illustrating a configuration of another example of the entrance inclined portion.
(A) is a side view, (B) is a cross-sectional view taken along the line AA in (A).

FIG. 20 is a control block flow diagram of the embodiment.

FIG. 21 is a block diagram illustrating a configuration of a gas introduction device.

FIG. 22 is a circuit diagram illustrating a configuration of a gas introduction device.

23A and 23B are cross-sectional views illustrating the operation of a gas blower and a vibrator provided in a lower part of a flow path near a valve body in the above embodiment, where FIG. Show

FIG. 24 shows a configuration of a delay valve.

FIG. 25 is a view showing another example of a pressing structure of the valve body.
(A) is a front view, (B) is a plan sectional view.

FIG. 26 is a cross-sectional plan view showing another example of the valve body pressing structure.

FIGS. 27A to 27D are diagrams illustrating a configuration of a pulse generation valve as another example of the pulse generation circuit, where FIGS. 27A to 27D are circuit diagrams, and FIG.

FIG. 28 is a sectional view showing another embodiment of the discharge control valve according to the present invention.

FIG. 29 is a diagram showing another example of the opening / closing drive mechanism of the valve body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Measuring valve (discharge control valve) 13 Valve seat 14 Valve body 10 Gas introduction device 47 Inlet inclined part 50 Gas blower 51 Gas blower 115 Metering valve (discharge control valve) 117 Valve body 123 Valve seat 127 Gas blowout pipe

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-60-176992 (JP, A) JP-A-3-177511 (JP, A) JP-A-2-100920 (JP, A) JP-A-61- 33422 (JP, A) Fully open 1987-99596 (JP, U) Fully open 1986-113098 (JP, U) Fully open 1988 6-1628 (JP, U) (58) Fields studied (Int. ⁷ , DB name) F16K 25/02 B65G 53/04 B65G 53/16 F16K 3/32 F16K 27/04 G05D 7/00

Claims (2)

(57) [Claims] 1. A method according to claim 1, wherein said fluid path is provided in a flow path connecting a fluid inlet and an outlet.
Opening that is opened and closed by a valve body that moves in a substantially vertical direction
A discharge control valve formed substantially on a vertical plane , wherein a flow path bottom surface extending from the fluid inlet to a position near the valve element is inclined downward, and a valve on the fluid inlet side downstream of the inclined portion. A gas outlet provided at a lower portion of the flow path near the body and for blowing gas from substantially downward to substantially upward; and a gas inlet for introducing gas into the gas outlet at least intermittently or continuously while the opening is open. Means, and a discharge control valve, comprising: 2. A method according to claim 1, wherein the fluid inlet and the outlet are provided in the flow passage.
Opening that is opened and closed by a valve body that moves in a substantially vertical direction
Is a discharge control valve formed substantially on a vertical plane , wherein an inclined portion in which a flow channel bottom surface extending from the fluid inlet to a position near the valve element is inclined downward, and a gas that blows gas from the bottom surface of the inclined portion. A discharge control valve, comprising: an air outlet; and gas introducing means for intermittently or continuously introducing gas into the gas outlet while at least the opening is open.