JPH04179628A - Continuous discharge device for powder/granule - Google Patents

Abstract

PURPOSE:To make the device simple in structure and mountable to various types of apparatuses, by disposing a cylindrical rotary container allowed to rotate about its lateral axis and having an opening in an outer peripheral surface, in opposed relation to a discharge port of a hopper, and rotating the container to cause its opening to communicate with the discharge port of the hopper and to cause this port to be closed by an outer peripheral container surface when the opening is moved to a lower position. CONSTITUTION:When an opening 28 of a rotary-drum like container 24 is aligned with a discharge port 22 of a hopper 21, the interior thereof and the interior of the container 24 are communicated with each other, whereby both have the same pressure and hence powdery granules in the hopper 21 drop into the container 24. Subsequently, the container 24 is rotated to cause the opening 28 to be directed downwards while the discharge port 22 is being closed by an outer-peripheral container surface 25, so as to permit the powery granules to be discharged outside. During this operation, seal is effected between the hopper discharge port 22 and the outer peripheral surface 25 of the rotary container 24, by means of a sealing member 26, whereby airtightness is maintained between both. By repetition of this operation, continuous discharge is carried out.

Description

[Detailed description of the invention] [Industrial application field] This invention is capable of discharging powder or granules existing in a device such as a dust collector where the internal pressure is different from the outside air to the outside of the device while maintaining the pressure difference between the inside and outside of the device. The present invention relates to a device configured to be able to perform. [Prior art and its problems]

For example, it is extremely difficult to discharge powder or granules in a container under negative pressure to the outside without releasing the pressure inside the container to atmospheric pressure. In such cases, conventionally, a special valve called a so-called rotary valve has been usually installed in the discharge section of the powder/granular material in the container. The above rotary valve is constructed as follows. That is, as shown in FIG. 7, the rotary valve 1 is
It has a casing 2 and a rotor 3 rotatably supported inside the casing 2. Casing 2 is
The rotor chamber 5 has a cylindrical inner surface 4 and has a predetermined width, and an inlet pipe 6 and an outlet pipe 7 communicating with the rotor chamber 5 are integrally formed. A shaft support hole 8 is formed in the left and right side walls of the casing 2 . The rotor 3 has a support shaft 9 rotatably supported by the left and right side walls of the casing 2, and a plurality of blades 1) extending radially at equal intervals from a boss portion 10 fitted around the support shaft. The blades 1) each have a width corresponding to the radius of the rotor chamber 5. Further, the relationship between the tip of each blade 1) and the cylindrical inner surface 4 is such that the rotation trajectory of the tip of each blade 1) corresponds to the cylindrical inner surface 4 with a slight gap, and each adjacent The central angle between the blades II is usually set such that at least a pair of adjacent blades and the cylindrical inner surface between the inlet pipe 6 and the outlet pipe 7 cooperate to form a closed transfer space 12. . Further, the support shaft 9 is rotationally driven by an appropriate driving means. The outlet pipe 7 is connected to a container containing powder/granules to be transported. When the upper support shaft 9 is rotated to rotate the rotor 3 in the counterclockwise direction in the figure, the powder/granules dropped from the inlet pipe 6 into the space between the adjacent pair of blades 1) are cylindrical. The transfer chamber M12 formed by the pair of blades 1) in cooperation with the inner surface 4 is transported downward by rotating around the support shaft 9, and at a portion where the upper cylindrical inner surface 4 is interrupted,
It is dropped into the outlet pipe 7. The central angle of each of the blades 1) is such that at least a pair of adjacent blades and the cylindrical inner surface between the inlet pipe 6 and the outlet pipe 7 always cooperate to form a closed transfer space 12. As a result, the gap between the boss portion 10 of the rotor 7 and the cylindrical inner surface of the casing 2 is always substantially closed by one of the blades +1. Therefore, even if there is a pressure difference between the inlet pipe 6 and the outlet pipe 7, the powder/granules can be transferred from the inlet pipe 6 to the outlet pipe 7 while maintaining the pressure difference.

[Problem to be solved by the invention]

However, the above-mentioned rotary valve l is only commercially available in a relatively large size, and its selling price is relatively high, so it cannot be easily incorporated into various devices. In addition, there was a problem that it could not be easily adopted due to cost. Furthermore, there is a mechanism called a so-called double damper as a mechanism for discharging internal powder, granules, etc. to the outside while maintaining the pressure difference between the inside and outside. However, in this case as well, the structure is generally complex and expensive, and there are also problems in that it lacks versatility. This invention was devised under the above-mentioned circumstances, and has a simple structure, can be manufactured at low cost, and can be miniaturized, so that it can be easily attached to various devices. It is possible, and furthermore, in cases where there is a pressure difference between the inside and the outside, such as in a dust collector,
The object of the present invention is to provide a powder/granule discharging device that can discharge the powder/granules inside to the outside while maintaining the pressure difference.

[Means to solve the problem]

In order to solve the above problems, the present invention takes the following technical measures. That is, the present invention is a powder/granule discharge device that is attached to a discharge port for collecting and discharging powder, granules, etc., which has a cylindrical outer circumferential surface, and has one cylindrical outer circumferential surface. A rotary container having an opening and rotatable about a central axis in a lateral direction is provided, and the rotary container has a first state in which the opening corresponds to the discharge port, and a first state in which the opening corresponds to the discharge port, and a first state in which the opening corresponds to the discharge port. It is characterized in that it can assume a second state in which the outlet is sealed by the cylindrical outer circumferential surface.

[Operation and effects of the invention]

When the rotating container assumes the first state in which its opening corresponds to the outlet of a dust collector, the internal space of the rotating container is
It communicates only with the inside of the dust collector, etc., through the opening and the discharge port, and has the same pressure as the internal pressure of the dust collector, etc. Powder, granules, etc. are collected at the above outlet, so this powder,
The particles fall without any problem due to gravity into the container, which has the same pressure as the internal pressure of the dust collector or the like. Next, when the container rotates around the central axis in the lateral direction and its opening shifts relative to the position of the outlet, the outlet becomes
It is sealed by the cylindrical outer peripheral surface of the container. On the other hand, when the opening of the container is opened to the outside, the pressure inside the container becomes atmospheric pressure, and when the container is rotated until this opening is located downward (second state), the powder/granules inside the container are The particles fall to the outside through the downwardly directed opening due to gravity and are discharged. At this time, since the discharge port is sealed by the cylindrical outer surface of the rotary container, the pressure difference between the inside and outside is maintained at a predetermined level. Subsequently, when the rotating container returns to the first state with its opening corresponding to the discharge port, the powder and granules in the main body of the dust collector, etc. are dropped into the rotating container as described above. . By repeating these operations, the powder and granules that accumulate at the bottom of the dust collector, etc. can be removed while maintaining the pressure difference between the inside and outside.
Can be discharged intermittently. Note that the rotating container may have a structure that rotates in one direction around a horizontal central axis, or may have a structure that rotates back and forth between the first state and the second state. good. As is clear from the above, the rotary container has a very simple structure, for example, formed in the shape of a cylindrical drum and provided with one opening on the outer peripheral surface of the cylinder. The evacuation device can be manufactured at very low cost.

[Explanation of Examples]

Embodiments of the present invention will be specifically described below with reference to the drawings. 1 and 2 are schematic configuration diagrams of a first embodiment of the present invention. In these figures, the reference numeral 21 indicates a hopper installed at the bottom of the main body of the dust collector, and collects dust that has fallen without adhering to the surface of the dust collection element, or dust that falls when cleaning the dust collection element by vibration, etc. The powder and granules are collected and can be discharged from a discharge port 22 formed at the lower end of the hopper 21. In this embodiment, the discharge port 22 is formed by fixing a flange member 23 having a through hole 22a to the lower end of the hopper. Further, on the lower surface of the flange member 23, a cylindrical inner surface 26 corresponding to a cylindrical outer peripheral surface 25 of the rotary container 24, which will be described later, is provided.
A sealing material 26 made of rubber, synthetic resin, brass, gunmetal, etc. is attached. Of course, this sealing material 26 is also provided with a hole corresponding to the through hole 22a of the flange member 23. A rotary container 24 is disposed below the flange member 23 and is supported by a bracket (not shown) so as to be rotatable about a lateral central axis 27 . In this embodiment, the rotary container 24 is formed into a drum shape, with disk-shaped side plates 24b fixed to both sides of a cylindrical outer peripheral member 24a having a constant width centered on the horizontal central axis 27. ing. This drum-shaped rotating container 24 has the above-mentioned side plate 2.
It is rotatable by supporting shafts 24c, 24c that protrude laterally from 4b, 24b on a bracket (not shown). An electric motor (not shown) or the like is connected to the support shaft 24c through a rotational transmission device consisting of a belt and a booster, or a rotational transmission device consisting of a sprocket and a chino. By controlling the electric motor, a drum-shaped rotation is possible. The container 24 is rotated in a predetermined manner. Further, the cylindrical outer peripheral member 24a of the rotary container 24 is provided with an opening 28 having a shape and size corresponding to the through hole 22a provided in the flange member 23. As shown in FIG. 1, this drum-shaped rotating container 24a has a first opening 28 that matches the through hole 22a of the flange member 23, and the internal space of the rotating container 24 communicating with the hopper 21. condition, and the above opening 2 as shown in FIG.
8 is located at the lower side, and the second state in which the cylindrical outer circumferential surface 22 of the rotary container 24 or the through hole 22a of the flange member 23 is sealed can be selected. This can be done by simply rotating the drum-shaped rotating container 24a continuously at a predetermined rotation speed, or by stopping the rotation for a certain period of time in the first state shown in FIG. It may also be configured to rotate at a constant speed. In addition to repeatedly realizing the first state and the second state by rotating the rotating container 24 only in one direction, the first state shown in FIG. 1 and the second state shown in FIG. The rotating container 24 may rotate back and forth between the two states. As is clear from FIGS. 1 and 2, the rotating container 24
When the rotary container 24 rotates in a predetermined direction from the state where the opening 28 corresponds to the through hole 22a of the flange member 23 and the opening 28 shifts relative to the through hole 22a of the flange member 23, the rubber seal Since the cylindrical inner surface 26a of the member 26 corresponds to and contacts the cylindrical outer circumferential surface 25 of the rotary container 24, the through hole 22a of the flange member 23, that is, the discharge port 22 of the hopper 21, is in contact with the rotary container 24. It is completely sealed by the cylindrical outer peripheral surface 20 of 24. Next, the operation of the embodiment shown in FIGS. 1 and 2 will be explained. As shown in FIG. 1, the opening 2 of the rotating drum-shaped container 24a
8 corresponds to the discharge port 22 of the hopper 21, the rotary container 24 is communicated with the hopper 21 via the opening 28 and the discharge port 22, and
The pressure inside 1 is the same as the pressure inside 1. Therefore, the powder/granules collected in the hopper 21 are allowed to fall into the rotary container 24 through the outlet or opening 28 by gravity without any problem. At this time, since the periphery of the opening 28 of the cylindrical outer surface 28 is sealed with the sealing material 26, the discharge port 22 is not opened to the outside, and even if the inside of the hopper 21 is under negative pressure. However, this negative pressure state is still maintained. Next, when the rotating container 24 rotates from the first state shown in FIG. By doing so, it is completely sealed. Then, when the rotating container 24 further rotates and enters the second state in which the opening 28 opens downward (the state shown in FIG. 2), the opening 28 of the rotating container 24 is opened to the outside, and Since this opening 28 is located downward, the powder/granules inside the rotating container 24 fall through the opening 28 due to gravity and are discharged to the outside. By repeating the above operations, even if the pressure inside the hopper is negative, the powder and granules collected at the bottom of the hopper can be transferred to the outside, where the pressure is higher, while maintaining the negative pressure inside the hopper. It will be discharged to 3 and 4 are schematic configuration diagrams showing a second embodiment of the present invention. The difference between this second embodiment and the first embodiment shown in FIGS. 1 and 2 is that an air inlet 29 is provided in the disc-shaped side plate 24b of the rotating drum-shaped container 24, and as shown in FIG. , the sealing member 30 is provided to seal the air introduction hole 29 only in the first state in which the opening 28 of the container 24 is located corresponding to the discharge port 22. The air introduction hole 29 is a relatively small hole, which provides the following advantages. As described above, since the inside of the hopper 21 is under negative pressure, when the rotary container 24 rotates from the first state shown in FIG. 3 and the opening 28 is opened to the outside, the container 24 is External air flows into the container through this opening 28 so that the pressure inside the container is equal to atmospheric pressure. If this inflow of outside air is too rapid, the dust accumulated in the container 24 will be disturbed, and even if the opening 28 is located at the lower position, all the dust and powder in the container will be removed.
There is a possibility that the particles may not fall out of the opening 28 quickly. However, as in the present embodiment, a relatively small air introduction hole 29 is provided in the inverted plate 24b of the drum-shaped rotating container 24, and the sealing member 30 is used, so that only when the drum-shaped rotating container 24 is in the first state shown in FIG. If the air introduction hole 29 is sealed, when the rotating container 24 starts rotating from the first state shown in FIG. Following this, the small air introduction hole 29 is first opened, and a small amount of surrounding air flows into the container 24 from there, thereby bringing the pressure inside the container to atmospheric pressure. Therefore, the powder/granules in the container 24 are less likely to be disturbed, and therefore, when the second state shown in FIG. It will be done. Next, an example of use of the powder/granule discharge device of the present invention will be explained based on FIGS. 5 and 6. This example is an example in which the powder/granule discharge device of the present invention is attached to a dust collector attached to a deburring device for resin molded products or the like using a blasting device. As is well known, a blasting device is a device that performs abrasive processing (blasting processing) by spraying an abrasive material onto an object in a high-speed air stream ejected from a nozzle. By using such a blasting device, it is possible to efficiently remove particles formed during resin molding. Such a deburring device is configured to recycle the abrasive material. The abrasive material is circulated and used by an air conveying means, and a separator is provided in the middle of such an air circulation path to separate the abrasive material from other particles or dust. The particles or dust separated from the abrasive material are sent to a dust collector 31. The dust collector 31 is generally configured to cause dust-containing air introduced into a container 32 to pass through a dust collection element 33 so that dust, etc., adheres to the dust collection element 33. Since it is necessary to pass air through the dust element 33, a suction blower 34 is installed at the top of the container 32. Therefore, the container 3 of this dust collector 31
The inside of 2 is normally under negative pressure. In order to operate such a dust collector 31 continuously, it is necessary to periodically clean the dust collecting element 33 by applying an impact with compressed air, etc., to remove the attached dust, etc. . and,
As a result of cleaning in this way, the container 3 of the dust collector
It is necessary to discharge the powder and granules that fall to the bottom of the dust collector to the outside without stopping the operation of the dust collector. In the case of a dust collector attached to a deburring device using a blasting device, as in this usage example, abrasives, deburrs, and fine dust are mixed and introduced into the dust collector, and these are collected in the electrolayer container 32. must be discharged to the outside. In this usage example, the abrasive material, paris, and dust are separated and discharged from the container 32, so that only the abrasive material can be reused. As shown in FIG. 6, the inclined bottom plate 35 of the container 32 of the dust collector 31 is formed to protrude outward from the side plate 36 of the container 32, and the hopper part 21 is formed in the protruding part of the bottom plate 35, A powder/granule discharge device of the present invention is connected to the lower part of this hopper section 21. As shown in FIGS. 5 and 6, a flange member 23 provided at the lower end of the hopper section 21 includes a drum-shaped rotating container 24.
A bracket 37 that supports the rotary container 24 is connected thereto, and this bracket 37 further supports a motor 38 that rotationally drives the rotary container 24 . And the above bracket 3
Further, a separation box 39 is connected to the lower part of 7 via a vibration isolating member 40 made of rubber or the like. The upper plate 39a of this separation box 39 is provided with an opening, so that the powder and granules falling by gravity from the drum-shaped rotating container 24 can be
It is designed to fall into the interior of this separation box 39. As shown in FIG. 6, inside the separation box 39, a rough paris separation chute 41 made of punched metal or the like with a large mesh that does not allow paris to pass through is provided in an inclined manner, and below the coarse paris separation chute 41, there is a An abrasive material separation chute 43 made of mesh punching metal or the like that is sufficient to prevent permeation of the abrasive material is formed in an inclined shape. The lower part of this separation box 39 is formed into a hopper shape, and is provided with a discharge port 43 through which the finest dust remaining at the end can be discharged. Further, a vibrator 44 that can vibrate the separation box 39 is attached to a continuous portion of the separation box 39. The powder/granules mixed with paris, abrasive material, and dust collected in the hopper section 21 are stored in the dust collector by the rotating container 24 selectively taking the first state and the second state. The same way as in the first and second embodiments described above, the liquid is discharged from the opening 28 of the rotating container 24 while maintaining the pressure. Next, in this usage example, the powder/granules discharged from the rotating container 24 are introduced into the separation box 39 which is slightly vibrated by the vibrator 44 . Then, the powder/granules mixed with paris, abrasive material, and dust are removed from the rough paris separation chute 41 and the abrasive material separation chute 4.
2. Immediately remove rough paris, abrasive material, and separation box 39
The dust is separated from the dust discharged from the discharge port 43. The coarse particles separated by the coarse particle separation chute 41 are discarded, the abrasive material separated by the abrasive material separation chute 42 is collected in a particle removing device and reused, and the dust is collected by a predetermined method. will be disposed of by Of course, the ll of the claimed invention! The scope is not limited to the embodiments described above, nor is it limited to its use. For example, in the first and second embodiments, the rotating container 24 is a drum-shaped rotating container, or it can also be, for example, a spherical rotating container. Furthermore, the method for rotationally driving this rotating container can also be changed in various ways. For example, it can be rotated by an electric motor, or when rotating the rotating container 24 back and forth between the first state shown in FIG. 1 and the second state shown in FIG. It is also possible to convert the axial reciprocating motion into the reciprocating rotation described above. Furthermore, the powder/granule discharge device of the present invention can be used as a powder/granule discharge mechanism in the dust collector as described above.
There are various ways of using it, such as using it as a device to take out a part of the powder, granules, small articles, etc. to the outside in the middle of the pneumatic transport pipe for powder, granules, small articles, etc. In addition, the above-mentioned embodiments and usage examples were all examples of discharging the powder/granules inside the applicable device while maintaining the internal negative pressure, but conversely, It can also be used as a device that discharges powder/granules inside the applicable device to the outside while maintaining the internal pressure.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams of a first embodiment of the present invention, FIGS. 3 and 4 are explanatory diagrams of a second embodiment of the present invention, and FIG. 5 is a side view of an example of use. Figure 6 shows the fifth factor Vl-
FIG. 7, a sectional view taken along the line VI, is an explanatory diagram of a conventional example. 22... Discharge port, 24... Rotating container, 25... Cylindrical outer peripheral surface, 27... Lateral central axis, 28... (Rotating container) opening.

Claims (1)

[Claims] (1) A discharge device for powder, granules, etc. attached to a discharge port that collects and discharges powder, granules, etc., which has a cylindrical outer peripheral surface and one opening in the cylindrical outer peripheral surface. and a rotary container rotatable around a central axis in a lateral direction, the rotary container being in a first state in which the opening corresponds to the discharge port, and in which the opening is located below and the discharge port is in the first state. A discharge device for powder, granules, etc., characterized in that it can take a second state in which it is sealed with a cylindrical outer peripheral surface.