JPH0411999Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention supplies materials such as powders and granules such as synthetic resin materials and pharmaceutical materials from a material storage section to a hopper using a suction air source. The present invention relates to a device for opening and closing the material outlet in a material feeding and supplying device equipped with a hopper configured to discharge material from a material outlet opened and closed by an outlet valve.

[Conventional technology and its issues]

Conventionally, the opening/closing device for the material outlet in this type of material input and supply device consists of [A] a damper that operates a solenoid in response to an activation signal from a suction air source at the start of material input and supply to the hopper, and is interlocked with the solenoid. The material outlet is closed by a closing means, the supply operating time determined from the supply amount per unit time is controlled by a timer, and the closing means is opened by its own weight after the timer setting time has elapsed, Proposed.

According to the above conventional example [A], (a) not only do many components such as the above-mentioned solenoid, a switch mechanism connected to it, and lead wires be required, but the structure is also complex and the equipment cost is high. It was expensive.

(b) In addition, various lead wires such as signal wires for the electric circuit connecting the hopper and the control panel are required, making wiring work time-consuming.

[B] As shown in Japanese Utility Model Application Publication No. 49-124776, the above-mentioned [A]
The drawbacks of (a) and (b) will be resolved.

That is, in this tank, an inlet is formed at the side of the tank, a suction port is formed at the top, and an outlet is formed at the bottom, and a suction means such as a vacuum pump is connected to the suction port side. The outlet of the storage tank is always closed by an outlet valve (bottom cover) due to the function of a balance weight, and when the valve is closed, material such as gas is supplied from the suction port by the suction force of the suction means, and the gas and other materials are supplied into the storage tank. The cyclone action causes dust to fall to the outlet side, and the processing gas is discharged out of the system from the suction port. To discharge dust, etc. from the outlet, the outlet valve opens when the sum of the weight of the dust relative to the outlet valve and the weight of the outlet valve itself becomes greater than the sum of the vacuum pressure in the storage tank and the moment due to the balance weight. It is designed to discharge dust and the like from the outlet, and is used as a so-called dust collector.

However, in this conventional example [B], (c) a balance weight was required because the material outlet was always closed by the outlet valve.

(d) Furthermore, this storage tank is a transportation source itself, and the material is pneumatically transported from the storage tank to another supply hopper, and the supply hopper is not provided with the material outlet opening/closing device described above. In other words, this conventional example [B] shows a dust collector.

[C] As shown in Utility Model Publication No. 59-25762,
The waste outlet of the storage tank that stores municipal waste is provided with an outlet cover that rotates downward and opens, and the air intake port opened outside the storage tank is provided with an air intake cover that rotates upward and opens. A structure of a discharge valve for a municipal waste storage tank is known in which the outlet cover and the air intake cover are connected by a connecting rod having a rotating shaft between them. That is, the outlet cover and the air intake port are always closed, and the weight of the garbage etc. opens the outlet cover, and after the garbage is discharged, the weight of the outlet cover closes the garbage discharge port and the air intake port to the exit. The lid and the air intake port lid are configured to close.

However, in this conventional example [C], (E)
When the outlet lid is closed, it is impossible to pneumatically transport the waste from the transport source to the storage tank due to the air force of the air source.

This invention attempts to solve all the problems of the above-mentioned conventional examples [A], [B], and [C].

[The problem that the idea aims to solve]

In order to solve the above problem, this invention forms a suction air conduit passage with a suction air source connected to the tip at the bottom of the hopper, and the material in the material storage section is connected to the suction air source through the upper opening of the hopper. The inlet of the transport pipe that suctions and transports the material into the hopper faces the hopper, and a cylindrical filter that separates the transported material from air is provided in the hopper so that it can be taken in and out freely, and the suction air provided at the bottom of the hopper is installed. The flap valve that opens and closes the conduit passage and the outlet valve that opens and closes the material outlet are connected by an arm, and are swingable about a pivot provided in the middle of the arm, and the outlet valve is normally open. The valve is in a valve state, and the flap valve is opened by the air force of the suction air source when material is supplied into the hopper, and the outlet valve is configured to close the material outlet.

[Effect]

When the suction air source is inactive and no material is being supplied, the outlet valve keeps the material outlet open due to its own weight and the weight of its arm.

When the suction air source is operated in this valve open state, while suction is being performed to open the flap valve, the suction action also suctions outside air from the material outlet side. Since pressure loss is large on the material inlet side of the hopper, outside air is strongly sucked in at the material outlet side, and this suction action causes the outlet valve to automatically close the material outlet of the hopper. During this valve closing operation, the material remaining on the inner wall of the material outlet is carried upward into the hopper by the suction action, thereby preventing material from being caught in the outlet valve.

On the other hand, due to the suction force of the suction air source, a predetermined amount of material in the material storage section is fed into the hopper through a transport pipe and a material inlet, and the material and gas (dust) are separated by a filter. At that time, the suction pressure inside the hopper gradually decreases due to the material, etc., and when the suction pressure falls below a predetermined pressure, the suction air source stops operating and the outlet valve automatically closes due to its own weight. The material in the hopper is discharged.

〔Example〕

An embodiment of this invention will be described below with reference to FIGS. 1 to 3.

A is a device that inputs and supplies materials such as powder and granules. This material input and supply device A is roughly divided into a hopper 1 which is configured to allow material input and supplied from a material inlet 6 to be discharged from a material outlet 9, and a suction air source 2 which inputs and supplies material into the hopper 1 with suction air. Consisting of

A cylindrical filter 3 for separating the material to be supplied and the suction air (and dust) therein is housed inside the hotpot 1 and can be taken in and out at will, and the inside of the filter 3 is used as a material storage section 4.
The material inlet 6 is formed in the upper part of the hopper 1 by penetrating the canopy 5, and a transport pipe 8 is connected to the material inlet 6, the tip of which can be taken in and out of a material storage section 7 such as a tank or bag. ing. The aforementioned material outlet 9 is formed at the lower end of the hopper 1 .
On the side of the hopper 1 above the material outlet 9,
a suction air pipe 1 whose tip is connected to the suction air source 2;
0 is connected. Although the specific structure of the suction air pipe 10 is arbitrary, in this embodiment it is composed of a protruding short pipe part 10a protruding from the hopper 1, a connecting short pipe part 10b, and a hose 10c. The suction air guide path 11 extends from the suction air source 2 to the transport pipe 8 and the suction air pipe 10. By sucking suction air from the suction air source 2 through the suction air conduit 11, the material in the material storage section 7 is sucked and supplied into the hopper 1 through the material inlet 6 from the transport pipe 8.

A flap valve 17 that opens and closes a part of the suction air guide path 11, and an outlet valve 16 that opens and closes the material outlet 9.
are provided at both ends of the arm 18, respectively, and are swingable about a pivot 19 provided in the middle of the arm 18 as a fulcrum. The specific structure, mounting position, etc. of the outlet valve 16 and the flap valve 17 are arbitrary.

The outlet valve 16 is normally kept open due to its own weight and the weight of the arm 18 (see solid line in FIG. 1). When the suction air source 2 is activated when the material outlet 9 is fully open, the suction pressure of the suction air causes the suction air pipe 10 to swing freely into the suction air guide path 11 and rotate counterclockwise in the drawing. The flap valve 17, shown in solid line in FIG. At the same time, the outlet valve 16, which was in the solid line position in FIG.
7 and the suction pressure on the material outlet 9 side becomes stronger than that on the material inlet 6 side, so that the material outlet 9 is automatically closed as shown by the imaginary line in the same figure. go. In this state, the material in the material storage section 7 is sucked and supplied into the hopper 1 from the transport pipe 8 through the material inlet 6.

When a predetermined amount of material is collected in the hopper 1, the suction pressure gradually decreases due to the material, etc., and when the suction pressure of the suction air becomes less than the predetermined pressure, When the air source 2 stops operating, the outlet valve 16 closes to the first outlet valve 16 due to its own weight.
It opens automatically as shown by the solid line in the figure, and
A flap valve 17 provided opposite to this closes off the suction air passage 11 as shown by the solid line in the figure. At this time, the material in the hopper 1 is transferred to the material outlet 9.
is discharged from. Although the flap valve 17 completely closes the suction air guide path 11 in the embodiment, it may not always be closed.

In this way, with the configuration in which the outlet valve 16 is closed by the suction pressure of the suction air from the suction air source 2, when the outlet valve 16 is almost completely closed,
A suction flow of outside air acts strongly toward the inside of the hopper 1 from the gap between the material outlet 9 and the outlet valve 16 on the lower outside of the hopper 1, and the material adheres or remains near the lower edge of the inner wall of the hopper 1. Since the material such as powder is separated and transferred upward, there is an advantage that the material is prevented from being caught in the outlet valve 16 and the closing performance of the outlet valve 16 is improved.

In addition, in the embodiment, the opening of the outlet valve 16 for the material outlet 9 is determined at a certain point in consideration of the suction pressure of the suction air source 2, which decreases in approximately inverse proportion to the increase in the material fed into the hopper 1. The outlet valve 16 is opened by utilizing a change in the suction force which becomes weaker to a degree slightly greater than the gravity of the closing means consisting of the outlet valve 16, the arm 18, and the flap valve 17 when it exceeds a certain amount (for example, when it is full). Although it is set to do so, other methods are also possible.

3a is a handle of the filter 3, 12 is a bearing, 13 is a collar, and 23 is a limit switch for checking whether the outlet valve 16 is open or closed.

FIG. 4 shows an example of application of this invention. This shows a case in which the material discharged from the hopper 1 is supplied to a synthetic resin molding machine 21 via a molding machine hopper 20, and 22 is a secondary filter.

Of course, this invention can also be applied to hopper dryers and the like.

[Effect of idea]

According to this invention, (1) At the bottom of the hopper 1, there is a suction air source 2 at the tip.
The upper opening of the hopper 1 has a material inlet 6 of a transport pipe 8 for suctioning and transporting the material in the material storage section 7 into the hopper 1 by the air force of the suction air source 2. The arm 18 is connected to the arm 18.
The outlet valve 16, which can swing freely around a pivot 19 provided midway, is normally open, and the flap valve 17 is opened by the air force of the suction air source 2 when feeding material into the hopper 1. Since the outlet valve 16 is configured to close the material outlet 9 when opened, the material in the material storage section 7 is transferred from the transport pipe 8 to the material inlet 6 by the force of the suction air from the suction air source 2. Not only can the material be suctioned and transported into the hopper 1 through the suction air, but also the material outlet 9 of the hopper 1 can be automatically closed by the outlet valve 16, which has a remarkable effect.

On the other hand, none of the conventional examples [A], [B], and [C] have such a structure and effect. Further, a balance weight like the conventional example [B] is not required.

(2) Inside the hopper 1, there is a cylindrical filter 3 that can be moved in and out to separate transported materials from air, etc., so materials such as powder and granules supplied from upstream are collected in the filter 3. Dust and air particles smaller than the above-mentioned material can pass through the filter 3 and be discharged to the suction air guide path 11.

(3) With the above-mentioned configuration, the outlet valve 16 can be opened and closed automatically at the appropriate timing by using the suction force of the suction air source 2. It has the advantage of not requiring many components such as a switch mechanism to be connected, a lead wire, and a signal line for an electric circuit connecting the hopper and the control panel.

(4) Furthermore, in view of the above configuration, when the outlet valve 16 is almost completely closed, the outside air flows into the hopper 1 from the gap between the material outlet 9 and the outlet valve 16 at the bottom of the hopper 1. Since the suction flow acts strongly and materials such as powder particles that adhere or remain near the lower edge of the inner wall of the hopper 1 are carried upwards, the material is prevented from getting caught in the outlet valve 16. has.

[Brief explanation of the drawing]

Each figure shows one embodiment of this invention.
The figure is a longitudinal sectional view, the second figure is a right side view of the first figure, and the third figure is a right side view of the first figure.
The drawings are a sectional view taken along the line shown in FIG. 1, and FIG. 4 is a schematic diagram showing an example of application. A...Material input and supply device, 1...Hopper, 2
...Suction air source, 3...Filter, 6...Material inlet, 7...Material storage section, 8...Transport pipe, 9...
Material outlet, 10... Suction air pipe, 11... Suction air guide path, 16... Outlet valve, 17... Flap valve, 18... Arm, 19... Pivot.

Claims (1)

[Claims for Utility Model Registration] At the bottom of the hopper 1, there is formed a suction air guide path 11 with a suction air source 2 connected to its tip, and at the upper opening of the hopper 1, the material in the material storage section 7 is sucked. The material entrance 6 of the transport pipe 8 which is suctioned and transported into the hopper 1 by the air force of the air source 2 is exposed, and a cylindrical filter 3 for separating the transported material from air etc. is freely inserted into and removed from the hopper 1. A flap valve 17 for opening and closing the suction air conduit 11 provided at the lower part of the hopper 1 and an outlet valve 16 for opening and closing the material outlet 9 are connected by an arm 18, and a pivot 19 provided in the middle of the arm 18 The outlet valve 16 is normally open, and the flap valve 17 is opened by the force of the suction air source 2 when feeding material into the hopper 1. A material outlet opening/closing device for a suction type material input and supply device, characterized in that the outlet valve 16 is configured to close the material outlet 9.