JPH0120347Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rotary valve, and more specifically, to prevent materials such as powder from adhering to the rotor and preventing the rotary valve from being blocked by the material. The invention relates to rotary valves.

[Conventional technology] The structure of a conventional rotary valve is shown in FIG.

In Fig. 6, the reference numeral 1 is the casing of the rotary valve, one end of which is formed with an input port 2 for materials such as powder, and the other end is formed with a material discharge port 3. has been done.

A rotor 4 is rotatably attached to the center of the casing 1, and four blades 5 are radially attached to the rotor 4 at equal angular intervals in the circumferential direction. Note that the rotor 4 is attached to a rotating shaft (not shown), and this rotating shaft is supported on both sides of the outside of the casing 1.

The amount of protrusion of the blades 5 is approximately equal to the radius of the inner diameter of the casing 1.

Based on the above-described structure, if the blades 5 are rotated together with the rotor 4, for example, in the clockwise direction in FIG. In this way, the material 6 is delivered to the discharge port 3 side, where it naturally falls due to its own weight and is discharged to the outside.

[Problems to be solved by the invention] Under such a structure, if the material 6 has high adhesion because it contains moisture or contains fine powder, etc. or,
If the material itself is adhesive, material 6
easily adheres to the base of the blades 5 and the circumferential surface of the rotor 4.

When the attached material grows and accumulates, the discharge capacity of the rotary valve decreases.

In the worst case, a blockage occurs.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a rotor having a plurality of blades arranged at intervals in the circumferential direction, which is rotatably provided inside the casing. In the rotary valve, an air blow nozzle is provided at the material discharge port of the rotary valve, and a blade position detection device detects that adjacent blades of the rotor face the material discharge port, and the blade position detection device is operated by the blade position detection device. , an air supply valve that controls air supply to the air blow nozzle is provided, and the air blow nozzle is arranged such that the air is applied to a surface connecting adjacent blades of the rotor at a position where the adjacent blades face the material discharge port. The structure is such that it is installed facing the direction along which the jet is ejected.

[Function] With this configuration, the blade position detection device is activated when adjacent blades of the rotating rotor are positioned facing the material discharge port.
Based on this, the air supply valve of the air blow nozzle is opened, and air is ejected from the air blow nozzle toward the rotor blades facing the material discharge port, and the air adheres to the rotor, such as the blades, or is likely to adhere to the rotor. The material to be removed is scattered to the discharge side and adhesion is prevented.

This air blowing operation for preventing material adhesion is performed sequentially on all blades around the entire circumference of the rotor.

[Example] Hereinafter, details of the present invention will be explained based on an example shown in the drawings.

1 to 3 illustrate one embodiment of the present invention, and in each figure, the same or corresponding parts as in FIG. 6 are designated by the same reference numerals, and their explanation will be omitted.

In this embodiment, as shown in FIG. 1, the blades are blades 7 formed with smooth curved surfaces 7a that connect adjacent blades of the rotor and allow air to flow easily.

A plurality of air blow nozzles 8 are attached at predetermined intervals along the width direction of the casing on the discharge port 3 side and at the base on the left side in FIG.

Since the air blow nozzle 8 is provided at the base of the curved surface 7a on the left side in FIG. 1, the curved surface is such that it is deepest at a position to the right of the center.

The purpose of forming such a curved surface 7a is to allow the air flow from the air blow nozzle 8 to flow easily and to prevent material from adhering to the surface.

On the other hand, as shown in FIGS. 2 and 3, the rotor 4
On one end side of the rotating shaft 4a, four arms 9a are arranged on the outside of the casing 1 at the same intervals as the arrangement of the blades 7 in the circumferential direction, and have the same number as the blades 7 and extend in the radial direction. A radial arm 9 having a striker 9b projecting outward at a right angle is attached to the tip of each arm 9a.

On the other hand, a pipe 11 connected to the air blow nozzle 8 is connected to a solenoid valve 12 which is an air supply valve, and the pipe 11 is connected to an air supply source such as an air tank (not shown). The actuator 1 is located near the striker 9b at the tip of the arm 9a of the radial arm 9.
A limit switch 13 whose portion 3a can be engaged with a striker 9b is attached to the casing 1 of the rotary valve via a bracket. The limit switch 13 and the solenoid valve 12 are electrically connected via a control panel 10. These radial arm 9 and limit switch 13 constitute a blade position detection device.

Next, the operation of this embodiment configured as above will be explained.

The blade 7 rotates, material 6 is supplied from the supply port 2 side, and the material 6 is supplied from the discharge port 3 side by the rotation of the blade 7.
When the blades 7 adjacent to each other at a certain position come to face the material discharge port 3 of the casing 1 as shown in FIG. 1 while the blades are being dispensed, the blade position detection device is activated. That is, the rotating shaft 4a is arranged at the same spacing as the blades 7 in the circumferential direction.
Arm 9a of radial arm 9 attached to
The striker 9b contacts the actuator 13a of the limit switch 13, and the actuator 13
a is tilted and the switch is turned on, and this signal opens the solenoid valve 12 via the control panel 10, and air from an air source (not shown) is supplied to the air blow nozzle 8.
From there, it is ejected toward the blade 7 facing the material discharge port 3.

The ejected airflow is vigorously guided in the direction along the smooth curved surface 7a, and brushes off any material that has adhered or is about to adhere to this curved surface 7a. This brushing off is performed as shown in FIG.
Since this is carried out exactly opposite the material discharge port 3, the brushed-off material does not go anywhere other than the discharge port 3 and is reliably removed.

Then, when the rotor 4, that is, the striker 9b further rotates, the striker 9b switches the limit switch 1.
3, the actuator 13a of the limit switch 13 returns to its original position, and this signal closes the solenoid valve 12.

Then, the radial arm 9 rotates and the next striker 9b comes into contact with the actuator 13a of the limit switch 13, and the same operation as described above is repeated, and the adjacent blade 7 facing the material discharge port 3
Air blowing is repeated sequentially to the blades 7.

In addition, if a plurality of air blow nozzles 8 are provided along the width direction (axial direction) of the casing 1 as shown in FIG. can.

In the above-described embodiment, the blade position detection device is a mechanical contact mechanism between the radial arm 9 and the limit switch 13. Instead, a non-contact type can be used as shown in FIG.

That is, the radial arm 9 is a radial arm 9 with a light shielding plate 9c provided at the tip of each arm 9a, and the emitter and light receiver are arranged in a straight line in the direction of the rotation axis at an appropriate distance on both sides of the light shielding plate 9c. The photoelectric device 14 provided can also be a blade position detection device. In this case, the light from the photoelectric device 14 is transmitted to the light shielding plate 9.
When it is shut off by c, this signal opens the solenoid valve 12 and supplies air to the air blow nozzle 8. Then, when the light shielding plate 9c further rotates and escapes from the position of the photoelectric device 14, the light receiver of the photoelectric device 14 detects the light and the solenoid valve 12 is closed.

Such a blade position detection device has the advantage of long life without mechanical wear due to contact.

In the above two embodiments, the timing of air blowing is controlled by the rotor 4.
It is carried out at the rotational position of (rotary shaft 4a),
Air blowing operations can be performed extremely reliably on all the blades 7 provided around the rotor 4 one after another at regular intervals.

In addition, as the simplest example of a blade position detection device, for example, a mark indicating the position of the blade 7 in the radial direction (a cross-shaped mark in the case of four blades) is marked on the shaft end of the rotating shaft 4a. At the same time, a timer is installed to configure a blade position detection device, and the mark is used to confirm from the outside that the blade is facing the blade 7 or material discharge port 3. From then on, the solenoid valve 12 is activated at regular intervals by the timer. It can also be opened to perform air blowing. That is, the rotor 4 (rotating shaft 4a)
Since the rotation speed of is usually constant, the interval time can be easily set using a timer. Of course, the above-mentioned radial arm 9 may be used instead of the mark.

FIG. 5 shows a case in which air blow nozzles 8 according to the present invention are provided facing each other on the left and right sides of the discharge port 3. In this case, the curved surface 7a of the blade 7 is a symmetrically formed curved surface, and the airflows ejected from the left and right air blow nozzles 8, 8 collide at the center of the curved surface 7a and are disturbed. Materials that try to adhere or have adhered to the material are strongly removed by the air flow, and the adhesion prevention effect can be further enhanced.

[Effects of the invention] As is clear from the above explanation, since the present invention has the configuration as described in the claims for utility model registration, during operation of the rotary valve,
Air can be ejected to the adjacent blades facing the material discharge port, and material adhering to the rotor, such as the blades, can be automatically brushed off, so the discharge capacity of the rotary valve can always be kept constant. I can do it. Note that since the air blow is performed at the material discharge port having a large volume, the density of the material is low and the resistance of the air flow due to the material is relatively small, so that adhesion caused by the air flow can be effectively prevented. Furthermore, since air blowing is performed only when adjacent blades of the rotor face the material discharge port, the amount of air for air blowing can be relatively small.

[Brief explanation of the drawing]

Figures 1 to 3 illustrate one embodiment of the present invention, in which Figure 1 is a vertical side view, Figure 2 is a side view,
FIG. 3 is a front view, FIG. 4 is a front view illustrating another embodiment of the present invention, FIG. 5 is a partially enlarged longitudinal sectional side view showing different mounting modes of the air blow nozzle of the present invention, and FIG. 6 FIG. 2 is a vertical side view illustrating a conventional structure. 1...Casing, 2...Material supply port, 3...
Material discharge port, 4...rotor, 4a...rotating shaft,
5, 7...Blade, 6...Powder (material), 7a...
...Curved surface (blade), 8...Air blow nozzle,
9... Radial arm, 9a... Arm, 9b...
Striker, 9c... Light shielding plate, 12... Solenoid valve (air supply valve), 13... Limit switch, 14... Photoelectric device.

Claims (1)

[Claims for Utility Model Registration] (1) In a rotary valve in which a rotor having a plurality of blades arranged at intervals in the circumferential direction is rotatably provided inside a casing, An air blowing nozzle is provided, and a blade position detection device detects when adjacent blades of the rotor face the material discharge port, and an air supply that is operated by the blade position detection device and controls air supply to the air blowing nozzle. A valve is provided, and the air blow nozzle is installed so that the air is blown out along a surface connecting adjacent blades of the rotor at a position where the adjacent blades face the material discharge port. A rotary valve characterized by: (2) The blade position detection device includes a radial arm having the same number as the blades, arranged at the same intervals as the blades in the circumferential direction, and having arms extending in the radial direction, which are attached to the rotor rotation shaft. , wherein an operating switch for the air supply valve is provided near the tip of the radial arm so as to be operable with the tip of the arm. The rotary valve described in item 1.