JPH01307423A - Dust collecting device - Google Patents

Abstract

PURPOSE:To prevent a powdery material from being mixed with the gas contg. dust and from entering into a dust collecting device and to improve the separation and collecting efficiency by connecting the gas inlet opening of the dust collecting device with the top cover part of the hopper of a hopper dryer, etc., through a gas discharge pipe so as to communicate with the hopper. CONSTITUTION:A cylindrical punching body 16 having a number of fine openings 11 and a cylindrical filter cloth body 20 received in the punching body 16 constitute the dust collecting device 1. The gas inlet opening 4 of this dust collecting device 1 is connected with the top cover part 61 of the hopper 51 of a hopper dryer 50, etc., through the gas discharge pipe 2 so as to communicate with the hopper, and the dust collecting device 1 is connected with a collected dust receiving part 7. As a result, the powdery material is prevented from being mixed with the gas contg. dust and from entering into the dust collecting device, so that the separation and collection efficiency is improved and the gas is recovered without remaining in the hopper. Moreover, the catching efficiency of the gas contg. dust is improved, and the scattering of powder and dust in the surroundings is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dust collector used in a hopper dryer or the like attached to a synthetic resin molding machine or the like.

[Conventional technology]

Conventionally, the following types of collection devices are known as this type.

■ First conventional example As shown in Fig. 10, the receiving part (
A powder/granular material inlet (03) is installed at the top of a hopper-shaped container (O2) installed in a hopper-like container (O2), into which powder or granular materials such as plastic raw materials are introduced using the energy of an air source such as a blower. 04), a powder outlet (o5) is provided at the bottom of the container (02), and an exhaust port (06) is provided at any location on the outer peripheral side wall of the container (02). The lower part of the powder inlet (04) and the exhaust port (0
6) A filter such as punching metal (07) is installed between the
A filter (o7) is known in which a filter (o7) is used to separate powder and granules from below and dust and gas from above.

(2) Second Conventional Example As shown in FIG. 11, a tangential flow type reverse flow cyclone is known. This cyclone consists of a cyclone body (08) consisting of a cylindrical part (09) and a conical part (010), and a cylindrical part (o9) which is made up of a container (02). An airflow containing dust flows in from the opening (011), descends while swirling along the inner wall of the cylindrical part (09), and then rotates several times until it reaches the lower end of the conical part (010), where it absorbs the dust. Gives centrifugal force.

Due to this centrifugal force, the dust settles in the direction of the wall, is separated from the gas, and is carried to the container (02) by the downward flow and collected. The airflow from which the dust has been separated swirls upward within the cyclone body (08) and is discharged to the outside through the discharge port (06). This cyclone is installed in the exhaust hole of the dryer and is used to separate exhaust air from dust.

[Problem to be solved by the invention]

However, in the first conventional example having the above-mentioned configuration, the filter (07) is likely to be clogged with particulate matter, dust, etc., and may remain attached thereto in some cases. Therefore, even if you blow air in the opposite direction to the exhaust direction, the filter (07)
It is difficult to remove dust and powder particles that are clogged or stuck to the container, so it is necessary to remove the lid (03) and open the container (
Remove the filter (07) from the filter (02) and remove the filter (02) from the filter (02).
The dust and powder remaining on the filter (o7) had to be brushed off by applying a brush to the numerous holes in the filter (o7), and the removal process was time-consuming and troublesome.

In addition, in the first conventional example, due to the drawbacks mentioned above, it is necessary to brush the filter (o7) every time when changing the material to transport powders of different colors or materials. Therefore, it was time consuming and troublesome to change the material. Moreover, if the filter (07) was not brushed completely, the previous powder and granules remained attached, so when changing the material, the subsequent powder and granules were There was a problem that the previous powder or granular material was mixed in.

The second conventional example described above requires a cyclone body for swirling the dust, so this cyclone body becomes large and requires a large installation space, and the cyclone body device also becomes complicated. .

In addition, when the wall surface inside the cyclone body is worn away by powder and granules, holes may form.If the dust is light, the updraft will be greater than the inertial force, making it impossible to separate, and the I end up going outside. Furthermore, when there is little exhaust air, the inertial force becomes weak and separation becomes impossible.

In order to improve the separation effect, the cyclone can be made smaller, but this is not effective because the pressure loss increases, and as mentioned above, the cyclone has to be made larger.

This invention attempts to solve all the problems of the first conventional example and the second conventional example.

[Means to solve the problem]

As a means to solve the above-mentioned problems, this invention constitutes a dust collecting device by a cylindrical punched body having a large number of pores and a cylindrical filter cloth inside this cylindrical punched body. The gas inlet of the device is connected to the canopy of a hopper such as a hopper dryer via a gas discharge pipe, and a dust collection receiving portion is connected to the dust collection device.

The cylindrical punched body is not limited to one in which the entire outer circumferential wall has pores, but may have pores in a part of the outer circumferential wall, for example, only in the lower part, and the shape thereof is arbitrary. be. It is preferable that the cylindrical punching body is provided in a detachable manner on the main body of the dust collector.

The shape of the cylindrical filter cloth body does not matter as long as it is installed inside the cylindrical punched body, but it is preferable to form it in a wavy shape when viewed from a cross section as described in the embodiments. Further, it is preferable that the cylindrical filter cloth body can be inserted into and taken out from the cylindrical punching body.

The dust collector is connected to an air pipe connected to an air source such as a compressor or blower that supplies air to blow off dust attached to the cylindrical filter cloth, and high-pressure air from the air source is supplied to the cylindrical shape. It is preferable that the dust adhering to the filter cloth is automatically brushed off by blowing into the filter cloth body.

The gas exhaust pipe or dust collector is equipped with a pressure sensor that detects pressure fluctuations due to dust clogging in the dust collector, and the signal from this pressure sensor is linked to send the signal to the pipe opening/closing valve attached to the air piping. The signal from the pressure sensor may be linked to a drive source such as a motor that starts the air source connected to the air piping described above.

In other words, the air source, air piping, pipe opening/closing valve, pressure sensor, etc. can detect dust adhering to the dust collector and automatically brush it off.

Further, it is preferable that a known level meter for detecting dust IT is provided in the dust collecting section, and this level meter is preferably provided with alarm means such as a buzzer or a lamp.

[Effect]

According to this invention, dust-containing gas generated in a hopper such as a hopper dryer rises to the upper part of the hopper and is supplied into the dust collector from the gas inlet of the dust collector through the gas exhaust pipe. . Dust and gas (
Filtration is performed to separate the dust from the air (air), and the dust is sent to the dust collecting section, and the purified clean gas passes through the cylindrical filter cloth body, passes through the cylindrical punching body, and is released into the atmosphere.

In this case, if the cylindrical filter cloth has a wave-shaped cross section,
Since the filtration area for dust-containing gas is wide, the wind speed passing through the cylindrical filter cloth can be slowed down, thereby reducing pressure loss and improving collection efficiency.

In addition, if the cylindrical filter cloth is clogged with dust in the dust-containing gas, high-pressure air is generated from an air source such as a compressor, and this high-pressure air is injected into the dust collector through the air piping. High-pressure air is filled between the cylindrical filter cloth and the cylindrical punching body, passes through the cylindrical filter, and blows off dust stuck on the inner surface of the cylindrical filter. On the other hand, clean gas is released from the lower part of the cylindrical punching body to the outside of the system.

The dust that has been brushed off falls and is collected by its own weight or by gas into the dust collecting section below. When the dust collection receiver is filled with a predetermined amount of dust or more, the level meter is activated, and an alarm means connected to the level meter issues an alarm, allowing the dust in the dust collection receiver to be disposed of.

When the inside of the dust collector becomes clogged with dust, a pressure sensor detects the pressure fluctuation caused by the clogging, and the signal from the pressure sensor opens the pipe opening/closing valve attached to the air piping, allowing high-pressure air from the air source to flow into the cylinder. To automatically brush off dust that is supplied to a filter cloth body and adheres to the cylindrical filter cloth body. In this case, the pressure sensor, pipe opening/closing valve, and air source drive 'a (motor) are linked, so that if the cylindrical filter cloth becomes clogged with dust, the dust will be removed automatically. It would be better to have it removed.

Note that the air for blowing off the dust attached to the cylindrical filter cloth body may be supplied intermittently or continuously, and the supply method is arbitrary.

〔Example〕

A first embodiment of the invention will be described below with reference to FIGS. 1 to 6.

This embodiment shows an example of the dust collector (1) of the present invention applied to a device called a so-called hopper dryer (50). The hopper dryer (50) includes a hopper (51) that dries the granular material supplied from the material hopper (52), etc., and a drying gas supply means (53) that dries the granular material in the hopper (51). It consists of etc.

The method of supplying the powder to the hopper (51) is arbitrary, such as a manual batch method, an air pressure feeding method, an air suction method, etc.

The drying gas supply means (53) takes in gas such as outside air or nitrogen from the filter (54) with a drying blower (55), sends it to the heating section (56), and heats it with the heater (57) of the heating section (56). The gas is supplied into the hopper (51) from the tip (59) of the gas supply pipe (58). The powder dried in the hopper (51) is supplied from the material outlet (60) to a receiving part (not shown) of a synthetic resin molding machine, a transport hopper, etc. outside the yarn.

A canopy part (61) that closes the upper opening of the hopper (51).
) is connected to one end of a gas exhaust pipe (2), and the dust collector (1) is attached to the other end of the gas exhaust pipe (2). The dust outlet of the dust collector (1) (
6) is attached with a dust collection receiver (7) made of a transparent tube, box, etc.

The dust collector (11) is formed into a cylindrical shape from an appropriate material such as metal or heat-resistant plastic, and has a large number of pores on its outer peripheral wall.
A cylindrical punching body Ql having a shape of υ...0υ, and a cylindrical punching body (10) that can be inserted into and taken out from the inside of the cylindrical punching body Ql,
and a cylindrical filter cloth body avr having a wave-shaped cross section.

The cylindrical filter body T2@ has an upper plate having an inlet communication port communicating with the gas discharge pipe (2), and a dust discharge port (6).
The lower plate Q has an outlet communication port r2@ that communicates with the lower plate Qυ, and the upper plate Qυ and the lower plate r2@ are sandwiched and supported by adhesion or fitting, and have excellent releasability and heat resistance against dust. It consists of a furnace cloth (c) made of plastic, ceramic, or metal.

The inner circumferential surface (23a) of the lower plate (2@) of the cylindrical filter cloth (Q) should be the same as and coincide with the cross-sectional shape (wavy shape in the example) of the furnace cloth (2!J). You can also do it.

By adopting such a configuration, dust-containing gas is removed from the lower plate Q.
It has the advantage that it does not adhere to or accumulate on the inner circumferential surface (23a) of 31, and can be smoothly separated and collected.

In addition, if the above-mentioned upper plate (2D) is also configured like this, the upper plate QO and the lower plate (to) can be made into the same part, so the assembly of the mold top and the cylindrical filter cloth body can be done even on the top. It's convenient.

In this embodiment, the cylindrical punching body OI and the cylindrical filter cloth body (to) are assembled by integrally forming an upper lid (3) having a gas inlet (4) at the lower end of the gas exhaust pipe (2). , while fixing the upper lid (3) and the upper end of the cylindrical punching body l with a fastening member (2) such as a rivet, inserting the cylindrical filter cloth body (to) from below into the cylindrical punching body OI. , the bottom of the cylindrical filter cloth body (2II) is supported by the lower M (5) having the dust outlet (6), and the cylindrical punching body 0.
and the lower M (5) are removably attached with a clip (clasp) or the like. When these are assembled, the upper plate an of the cylindrical filter cloth (toward) is in close contact with the upper lid (3), and the lower plate 1231 is in close contact with the lower lid (5), and the cylindrical filter cloth QI and the cylindrical punching body Ql have an appropriate interval.

In addition, contrary to the embodiment, the upper end of the cylindrical punching body OI and the upper lid (3) are made removable with clips a1, etc., and the lower end of the cylindrical punching body Ql and the lower lid (5) are connected with rivets (
It can also be fixed with

The assembly structure of the cylindrical punch, the ring body α [and the cylindrical filter cloth body (to) is not limited to the above, but is arbitrary.

The lower lid (5) is almost funnel-shaped, and its dust outlet (
6) has a dust collection receiver (7) made of a transparent tube or other material attached to it with a band (8), etc.
Further, the outlet of the dust collecting section (7) is blocked by a camp (9).

A second embodiment of the invention will be described below with reference to FIGS. 7 to 9.

This embodiment differs from the first embodiment in the cylindrical punching system, and also has an automatic system for detecting dust etc. adhering to the dust collector (1) and automatically brushing off the dust etc. The remarkable feature is that it has a dust removal means, a level needle (37) for detecting the amount of dust in the dust collecting part (7), and an alarm means connected to a level meter (manufactured by a company). The same reference numerals as in the first embodiment have the same configuration.

That is, the dust collector (1) is connected to the other end of the gas exhaust pipe (2) which is connected to the canopy (61) of the hopper (51) which is a part of the hopper dryer (50). The dust device (11 is composed of a cylindrical filter cloth body 12 and a cylindrical punching body +II that houses this cylindrical filter cloth body (to)), but the cylindrical punching body α1 has a non-porous upper hood ( 10a
) and a lower punching body (lOb) with a large number of pores aυ...0υ, and the cylindrical filter cloth I2
The clean gas filtered and dust-collected in the above-mentioned lower punching body (10b) can be discharged out of the system.

An air pipe (to) connected to an air source 0D such as a compressor at the tip is attached to the side wall of the upper hood (10a), and a cylindrical filter cloth is connected to the backwash nozzle (30a) of the air pipe (to). By blowing high pressure air to rs, the cylindrical filter cloth +
The dust attached to 21 is brushed off. The air piping (to) includes an air source port υ, a strainer 03, a pressure gauge (to), a pipe opening/closing valve such as a solenoid valve 0!9, and a backwash nozzle (30a) from the distal end to the proximal end. ) are installed in sequence.

Further, the gas exhaust pipe (2) or the dust collector fil is provided with a pressure sensor 〇- for detecting pressure fluctuations due to dust clogging in the dust collector fil, and the signal of this pressure sensor 01 is transmitted to the air pipe fil. It is linked so that it is sent to the conduit opening/closing valve (to) attached to (to). Therefore, when the inside of the dust collector (1) is clogged with dust and the internal pressure rises, the pressure sensor 0@ detects the rise in internal pressure and sends the detection signal to the pipe opening/closing valve aS, and the pipe opening/closing valve (to) Open, air fl (
High-pressure air from the air pipe (to) is ejected from the backwash nozzle (30a) at the tip of the air pipe (to) between the cylindrical punching body ol and the cylindrical filter cloth r2@, and the cylindrical filter cloth Q Brush off the dust stuck inside the venue.

The dust collection part (7) is equipped with a level meter (37) that detects the amount of dust.
), and this level meter (2) is also equipped with a 0 o'clock warning means such as a buzzer and a lamp.

The number and arrangement position of the backwash nozzles (30a) are arbitrary. For example, a configuration as shown in FIGS. 8 and 9 can also be used.

The one in Fig. 8 has multiple branch pipes from one air pipe (toward)...@The eyelid is branched and each branch pipe 14@ is provided with a backwash nozzle (30a), and each backwash Nozzle (30a) -
(30a) (three in Fig. 8) are attached to the dust collection bag 'l (11).This is because organic matter in the dust-containing gas is relatively easy to peel off from the cylindrical filter cloth tS. It is suitable for small capacity applications.

In the one shown in Fig. 9, a backwash nozzle (30a) is provided for each of a plurality of air pipes (to)... (to), and each backwash nozzle (30a)
30a) is attached to a dust collector +l).

This is suitable for large-capacity filters in which organic substances and the like in dust-containing gas are difficult to peel off from the cylindrical filter body r2I.

Incidentally, the dust adhering to the cylindrical filter cloth r2- is removed by high pressure air supplied in pulses (intermittently) by the operation of the pipe opening/closing valve o51 attached to the air piping (to).
It is also possible to shake off the dust by applying vibration to the two sieves, but instead of using such a dust removal mechanism, it is also possible to use a vibrator or the like to shake off the dust.

In addition, the exhaust gas from the lower punching body (10b) is connected to be introduced into the drying blower (55), and the exhaust gas from the hopper (51) is filtered and collected by the dust collector (1). A drying blower (5
5) can be recycled and used. Since the exhaust gas introduced from the lower punching body (10b) is air purified by the cylindrical filter body, the drying blower (55)
There is no need to add a special filter to reach this point.

(Effects of the Invention) Since the present invention has the above configuration, it has the following effects.

(1) Since the dust collector is composed of a cylindrical punched body with a large number of pores and a cylindrical filter cloth inside this cylindrical punched body, the dust is filtered and collected by the cylindrical filter cloth. The clean gas is uniformly dispersed through the pores around the entire circumference of the cylindrical punching body due to the resistance of the cylindrical punching body and is released outside the system, which improves the collection efficiency of dust-containing gas. Not only that, it also prevents dust from being scattered around. Moreover, the cylindrical punching body also serves as reinforcement for the cylindrical filter cloth body.

(2) Since the gas inlet of the dust collector is connected to the canopy of a hopper such as a hopper dryer via a gas exhaust pipe, dust-containing gas and powder particles may mix and flow into the dust collector. There is no such problem, the collection efficiency is improved, and gas can be recovered without remaining in the hopper.

It is also possible to connect the gas inlet of the dust collector to the side wall of a hopper such as a hopper dryer and take out the gas from the side, but in this case, dust-containing gas and powder particles may mix and collect. Dust flows into the device and normal separation and collection effects cannot be obtained.
This also resulted in a loss of powder and granules. As a solution to this problem, a wire mesh was placed at the gas outlet of the hopper to prevent contamination, but a new problem arose in that powder and granules adhered to the ml, making it difficult for the exhaust gas to be discharged. . As mentioned above, the present invention can completely eliminate these problems.

(3) Since the dust collector is connected to the dust collector, dust-containing gas and powder particles can be stored in the dust collector without scattering to the outside, improving the cleanliness of the working environment. can.

(4) Since the main components of this dust collector are the cylindrical punching body, the cylindrical filter cloth body, and the dust collection receiving part, the structure is simple and can be miniaturized.

(5) When the cross section of the cylindrical filter cloth is formed into a wave shape,
Since the filtration area for dust-containing gas is wide, the wind speed passing through the cylindrical filter can be slowed down, thereby reducing pressure loss and improving the collection efficiency. Dust-containing gas can be separated and collected even when the specific gravity and particle size are small.

(6) If the cylindrical filter cloth body is installed inside the cylindrical punching body so that it can be taken in and out, or if the cylindrical punching body is installed in the dust collector body in a detachable manner, it will be easier to replace the filter cloth when it becomes clogged. Cleaning etc. can be done easily.

(7) When an air pipe connected to an air source that supplies air to blow off dust attached to the cylindrical filter cloth is connected to the dust collector, the cylindrical filter is Dust attached to cloth can be automatically brushed off.

The gas exhaust pipe or dust collector is equipped with a pressure sensor that detects pressure fluctuations due to dust clogging in the dust collector, and the system is configured to be linked so that the signal from this pressure sensor is sent to the pipe opening/closing valve attached to the air piping. When the cylindrical filter cloth is clogged with dust, the pressure sensor detects the degree of dust clogging, and the conduit opening/closing valve is opened and closed based on the detection signal, and high-pressure air is blown out from the air source. Dust attached to the filter cloth is automatically brushed off.

Furthermore, the dust collection receptacle is equipped with a level meter that detects the amount of dust, and this level meter is connected to an alarm means such as a buzzer or lamp. It is possible to automatically detect the cleaning time and issue an alarm.

Thus, according to the present invention, it is possible to provide a dust collector that has a high collection efficiency, maintains a clean working environment, and can automatically remove and manage dust.

[Brief explanation of the drawing]

Fig. 1 is a general front view showing an application example of the first embodiment, Fig. 2 is an enlarged front view of the dust collector shown in Fig. Figure 4 is a front view showing a cross section of a part of the cylindrical filter cloth, Figure 5 is a cross-sectional view of Figure 4, and Figure 6 is an exploded partial vertical cross-sectional view of the dust collector shown in the figure. FIG. 2 is a plan view, FIG. 7 is a general front view showing an application example of the second embodiment, and FIG. 8 is a partial cross-sectional view showing an example of how air piping and a backwash nozzle are installed. FIG. 9 is a partial cross-sectional view showing another example of attachment similar to FIG. 8. FIG. 1O and FIG. 11 are schematic sectional views showing conventional examples, respectively. ! 11... Dust collector, (2)... Gas exhaust pipe, (3
)...Top lid, (7)...Dust collecting part, Ol...Cylindrical punching body, (10a)...Upper hood, (10b
)...lower punching body, 0υ...pore,...
・Cylindrical filter cloth body, kiln...filter cloth, (2)...air piping,
01)...Air source, o9...Pipe opening/closing valve, 0 groan...
・Pressure sensor, (g)...Level meter, 0 o'clock...Alarm means, (50)...Hopper dryer, (51)...
・Hopper, (61)...Canopy part. Patent applicant Matsui Seisakusho Co., Ltd. Figure 1 Zeta Figure 2 Figure 15 Figure 9 Figure 10 Figure 11

Claims (8)

[Claims] (1) Cylindrical punched body with many pores (11) formed (
10) and a cylindrical filter cloth body (20) housed inside this cylindrical punching body (10) constitute a dust collector (1), and the gas inlet (4) of the dust collector (1) is connected to a hopper dryer. (50)
Gas exhaust pipe (2) is installed in the canopy (61) of the hopper (51).
), and the dust collector (1) is connected to a dust collection receiver (7). (2) The dust collector according to claim (1), wherein the cylindrical filter cloth (20) has a wave-shaped cross section. (3) The cylindrical filter cloth body (20) is a cylindrical punched body (10)
The dust collector according to claim 1 or 2, which is installed inside the dust collector so that it can be taken in and taken out freely. (4) The cylindrical punching body (10) is removably attached to the main body of the dust collector (1).
) The dust collector described in any of the above. (5) The dust collector (1) has an air source (3) that supplies air to blow off dust attached to the cylindrical filter cloth (20)
The dust collector according to any one of claims (1) to (4), further comprising an air pipe (30) connected to the air pipe (1). (6) The gas exhaust pipe (2) or the dust collector (1) is equipped with a pressure sensor (36) that detects pressure fluctuations due to dust clogging in the dust collector (1). Claim No. 36) is interlocked to send the signal of 36) to the conduit opening/closing valve (35) attached to the air piping (30).
The dust collector described in section 5). (7) The dust collection receiver (7) is provided with a level meter (37) for detecting the amount of dust.
The dust collector described in any of paragraphs. (8) The dust collector according to claim (7), wherein an alarm means (38) is connected to the level needle (37).