JPH04335987A - Vibration dryer - Google Patents

Abstract

PURPOSE:To provide a vibration dryer in which sludge deposit is not clogged in gaps of straightening plates for a long term even if it is used to heat and dry the deposit in a city refuse disposal plant, continuously supplied deposit is not stayed, and dried ash of a desired discharge amount can be continuously discharged to a predetermined position in response to a desired dryness. CONSTITUTION:A straightener 17 is developed in a casing 4, and effected by vibration at predetermined frequency and amplitude in a predetermined direction. Wet ash generated from an incinerator of a city refuse disposal plant is supplied in a sludge state to a supply port 50, transferred on the straightener by the vibration, hot air is blown from below to above through slits 19 of a straightener 19 on the way of transferring, sludge deposit (m) on the straightener is fluidized, lower ends of leaf springs disposed on lower runner, of the springs mounted at a predetermined pitch on a chain belt 32 to be efficiently heat exchanged to be heated and dried, are pressed on the straightener, and fed in the same direction as the feeding direction of the deposit by the vibration on the straightener while scraping the deposit on the straightener.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration dryer, and more particularly to a vibration dryer that is most suitable for use in a plant that processes municipal waste.

0002

[Prior art and its problems] In recent years, the treatment of municipal waste has become a major social problem.As an example of a plant that processes this municipal waste, after incinerating the municipal waste and turning it into ash, There is a plant that is designed to bury this. In such plants, after the waste is incinerated,
It must be cooled by pouring water on it and transported from the incineration site to another location. In some plants, vibration dryers are used for this purpose. In this vibration dryer, for example, a large number of strips are fixed to a casing with small gaps in order to form a transport path by vibration, and the entire casing is moved in a predetermined direction by, for example, a crank-type vibration drive unit. By vibrating with a predetermined width and a predetermined frequency, the ash from the incinerator that is supplied to one end of the rectifier plate serving as a transfer path is transferred, and during this transfer, it passes through the gap in the rectifier plate from below to above. The hot air is blown up to fluidize the ash on the rectifying plate, while exchanging heat with this hot air to dry the wet ash while transporting it.
It is known that the dry ash is discharged from the other end of the current plate to a predetermined position.

However, municipal waste must be treated in large quantities and continuously;
When the vibrating dryer is operated, sludge-like ash gradually sticks to the rectifier plates, clogging the small gaps between each rectifier plate, and not only obstructing the flow of hot air.
With a given swing width, vibration angle, and frequency, it is no longer possible to transport the ash at the desired discharge rate, and the sludge-like ash that is continuously supplied from the supply end often stagnates. ing.

0004

[Problems to be Solved by the Invention] The present invention has been made in view of the above-mentioned problems, and is capable of smoothly drying the ash that has been incinerated in a municipal waste treatment plant and turned into sludge by pouring water over a long period of time as desired. It is an object of the present invention to provide a vibration dryer capable of drying products at a certain temperature and discharging them to a predetermined position with a desired amount of discharge.

[0005]

[Means for Solving the Problems] The above object is to provide a casing in which a rectifier plate having a large number of openings is stretched, an air supply means for sending hot air from below to above the rectifier plate, a chain belt disposed above the rectifying plate and having leaf springs erected and attached at a predetermined pitch, vibrating the casing to transfer the material to be dried on the rectifying plate; The downward running portion of the chain belt runs in the same direction as the direction of transport caused by the vibration, and while the material to be dried is being transferred, the material to be dried is heated by the hot air and rubbed by the lower end of the leaf spring. This is achieved by a vibrating dryer, which is characterized by a vibration dryer.

[0006]

[Operation] A casing in which a rectifier plate having a large number of openings is stretched is vibrated at a predetermined frequency, amplitude, and vibration angle in the same manner as before. The sludge-like ash of the incinerated municipal waste, which is supplied to one end of the current plate, is transferred on this current plate by this vibration. During this transfer, the hot air is sent from below to above through a large number of openings in the baffle plate. As a result, the sludge-formed municipal waste on the baffle plate becomes fluid, efficiently exchanges heat with the hot air, is heated, and is transported by vibration while being dried.

On the other hand, among the leaf springs attached at a predetermined pitch to a chain belt disposed above the current plate and along the current plate, the lower end of the leaf spring located in the downward running portion of the chain conveyor presses the rectifier plate, slightly bends and deforms it, and in addition to transporting it by vibration, the lower end of this leaf spring presses the rectifier plate, bending it slightly and dislodging the sludge-like municipal waste ash above it. It acts as a scraper. Therefore, the chain conveyor runs at a predetermined driving speed, and the lower ends of the leaf springs constantly scrape off the sludge on the baffle plates at that pitch. Therefore, the desired degree of dryness can be continuously maintained for a long period of time, and the sludge can be dried to a desired position at a desired discharge amount and discharged as ash to the outside.

[0008]

[Embodiment] A vibration dryer used in a municipal waste treatment plant according to an embodiment of the present invention will be described below.

FIGS. 1 and 2 show the entire vibrating dryer of this embodiment, which is shown as 1 and consists of a chain belt section 2 located at the upper part and a vibrating conveying section 3.

First, the vibration conveying section 3 will be explained. A rectangular casing 4 is connected to a lower base frame 5 by a plurality of coil springs 7 and a coil spring 8. The center part of the Lenker 8 is rotatably supported by a rubber bushing 10 at the upper end of a column 9 erected on the base 5, and both ends are also rotatable by rubber bushings with respect to the casing 4 and the base 5. is supported by Although such a structure is known, according to this embodiment, the coil spring 7 and the coil spring 8 disposed perpendicularly thereto are attached at right angles to each other, but the vibration direction determined by this is different from that in comparison. The target is set to be large.

An electric motor 11 as a drive source is fixed to one side wall of the base 5, and this is connected to the crank drive mechanism 1.
The rotational force is transmitted to the casing 4 through the belt, and the crank drive mechanism 12 converts this into a linear vibration force, and this linear vibration force is transmitted to the casing 4 via the drive rod 13 and the shock absorber 14 made of plate rubber. The signal is transmitted to the mounting plate 15 fixed to the side wall. That is, one mounting plate of the rubber plate of the shock absorber 14 made of plate rubber is the mounting plate 1.
5 and the other mounting plate is fixed to the drive rod 13.

The casing 4 has a sealed structure, and a rectifying plate 17 is provided in the upper part of the casing 4 to form a passage for transporting sludge due to vibrations.
A duct 16 serving as a hot air supply means is fixed so as to open into the space below the current plate. A blower and a heat source (not shown) are connected to this, and hot air is sent below the rectifying plate 17 and guided outside through an upper air exhaust duct, which will be described later. Hot air is configured to flow from below to above the current plate 17.

As shown in FIG. 4, the rectifying plate 17 is composed of a large number of strip plates 18, and a slit 19 is formed between these strip plates 18, 18. As clearly shown in FIG. 6, this slit 19 has an upper portion formed as a thin slit portion 19b that is straight in the vertical direction, and a lower portion that is connected to this and forms a tapered opening portion 19a. This increases the effect of hot air flowing from the bottom to the top, and also minimizes the effect of clogging the slit 19 as the sludge dries in the slit 19.

Next, the chain belt portion 2 disposed in the upper portion will be explained.

The chain belt portion 2 is also provided with a rectangular casing 22, in which a chain belt 32 is disposed. This consists of driving sprocket wheels 31a, 31b, driven sprocket wheels 32a, 32b on the left side in FIG. 2, chains 36, 37 wound around these sprocket wheels 31a, 31b, 32a, 32b, ,
As shown in FIG. 5, a roller 35 is rotatably supported between a pair of chains 36 and 37 at a predetermined interval as shown in FIG. 34 is configured to be guided as clearly shown in FIG.

Further, in this embodiment, three leaf springs 39a and 39b are fixed as a set to the chain belt 32 constructed as described above at a predetermined pitch. That is, the leaf spring attachment members 38a and 38b are further attached to the chain 36 via an attachment member, and the leaf springs 39a and 39b, which make up a set of three, are alternately spaced apart at a predetermined interval as shown in FIG. The mounting member 3 is erected and offset in one direction.
8a and 38b, which drive the drive sprocket wheels 31a and 31b so that the chain belt 32 runs in the directions indicated by arrows A and B, as will be described later. The sludge spreads uniformly over the entire width of the strip plate 18 onto the leaf springs 39a, 39.
It is designed to be scraped off at the lower end of b.

As shown in FIG. 1, the casing 22 of the chain conveyor section 2 has a pair of left and right supports 20, 2.
As shown in FIG. 1, a motor 26 for driving a chain belt 32 is attached to one of the pillars 21, and this drive shaft 29 is fixed to a sprocket wheel 28. A chain 27 is wound between this sprocket wheel 53 and a sprocket wheel 53 which is coaxial with the drive sprocket wheels 31a and 31b and is disposed outside the casing 22. The driving force of this sprocket wheel 53 is transmitted to the drive sprocket wheels 31a, 31b via the shaft 25.

According to this embodiment, the rotational speed of the motor 26, that is, the transport speed of the chain belt 32 in the directions A and B is adjusted to be approximately equal to the transport speed due to the vibration of the sludge on the rectifier plate 17. . In other words, the lower ends b of the leaf springs 39a and 39b attached to the lower running part of the chain belt 32 for transporting the leaf springs move in the direction B while slightly pressing the rectifier plate 17, and this advancing speed The vibration-induced transport speed of the sludge m scraped off at this lower end is adjusted to be approximately the same.

Furthermore, the casing 22 of the chain conveyor section 2
An exhaust duct 24 is fixed to the upper wall as shown in FIG. 1, so that the casing 22 of the chain conveyor section 2 has a sealed structure, and the casing 4 of the vibration conveying section 3 also has a sealed structure. However, by assembling as shown in FIG. 3, the whole becomes a sealed structure, so the hot air blown from the duct 16 below the rectifying plate 17 is sucked into the duct 24 above, and the sludge m on the rectifying plate 17 is It is configured to be efficiently fluidized and to efficiently exchange heat with hot air.

The vibration dryer for municipal waste treatment plants according to the embodiment of the present invention has been described above, and its operation will now be described.

Although not shown in the drawings, ash is discharged from the incinerator of a municipal waste treatment plant, and the municipal waste turned into sludge by water sprayed onto it is indicated by an arrow at the sludge supply port 50 clearly shown in FIGS. 1 and 2. Supplied as follows.

The vibration drive unit in the vibration transfer unit 3 is of the crank drive type according to this embodiment, and the vibration drive unit in the vibration transfer unit 3 is driven by the casing at a frequency determined by the rotational speed of the motor 11 and the diameter ratio of the pulley forming a part of the crank drive unit 12. 4 vibrates in the direction in which the coil spring 7 extends. That is, as shown in FIG. 6, the current plate 17 vibrates in the direction of arrow a. This vibration causes each strip 18
The upper sludge m is fluidized by the vibrations and also by the hot air blowing from below to above through the slit 19, and is transported in the direction of arrow B shown in FIG. During the transfer, it exchanges heat with the hot air and is heated. Therefore, it is dried. Also, during this transfer, the leaf spring attached to the lower running part of the chain belt 32 is the leaf spring 39 in FIG.
The lower end of b is bent as shown. However, the strip plate 18
vibrates with a constant amplitude in the direction a, and each point of this strip plate 18 periodically shifts between the neutral point, the upper fulcrum, and the lower fulcrum; As shown in the figure, the lower end portion is slightly bent by the band plate 18. However, since the lower end of the leaf spring 39b is arranged slightly away from the upper surface of the strip plate 18 at the lower fulcrum, there is a possibility that the lower end of the leaf spring 39b may fit into the slit 19 during a certain phase of vibration. However, even if the lower end is fitted in without interfering with the drive of the chain belt 32, it has already been pulled out from the slit 19 at the lower fulcrum.

According to this embodiment, the leaf springs 39a, 39b
The transfer speed v1 in arrow B of is almost the same as the transfer speed v2 (≒v1) due to the vibration of the sludge m on the rectifying plate 17, so the sludge m on the strip plate 18 at the lower ends of the leaf springs 39a and 39b is However, since this scraping speed is almost the same as the transport speed due to vibration, and each set of leaf springs 39a and 39b (one set of three) is arranged at a predetermined pitch, this leaf spring 39a,
Depending on the transfer speed of the leaf springs 39b, the sludge may become very thin between the leaf springs of each set, or the sludge may not be localized.
The sludge m on each rectifying plate 17 as in the case where b does not exist.
is moved to the right in the figure by vibration with a nearly constant and uniform bed pressure. Therefore, the sludge m is efficiently scraped off over the entire area of the rectifying plate 17 by the lower ends of the leaf springs 39a and 39b.

As described above, in FIGS. 1 and 2, the ash is discharged downward as indicated by the arrow Q through the discharge opening 51 formed at the right end of the casing 4 at a desired degree of dryness. become.

The vibration dryer for municipal waste treatment plants according to the embodiment of the present invention operates as described above, and has the following effects.

That is, in the municipal waste treatment plant, sludge m is continuously supplied to the supply port 50 at a substantially predetermined ratio, and this is continuously supplied to the discharge opening formed at the lower end of the casing 4. 51, it is dried to a desired degree of dryness and discharged to the outside as ash.

Due to the sticking of the strip 18, which has been observed in the past due to the scraping action of the leaf springs 39a and 39b, the slit 19 is clogged after a certain operating time, and the hot air is not allowed to pass from below to above. This clumping causes the ash to accumulate on the supply side and not come out from the discharge opening, and the ash can be continuously discharged at a desired degree of dryness over a long period of time.

In FIG. 1, a pair of chains 36 are connected to the driven sprocket wheels 32a, 32b and the driving sprocket wheels 31a, 31b of the chain belt 32.
, 37 are wound around the driven sprocket wheels 32a, 37. In this embodiment, a known tension adjustment device 52 is connected to the driven sprocket wheels 32a, 32b. This makes it possible to perform a known adjustment operation by adjusting the screws and nuts so that a predetermined tension is applied to the chains 36, 37 during maintenance. As a result, this vibration dryer 1
At the start of use, the speed of the electric motor 26 is adjusted, and the diameter ratio and number of gears of the sprocket wheels 28, 53, 31a, 31b are adjusted.
The leaf springs 39a, 39b are moved so that the above sludge m is transported at almost the same speed in the same direction.If the electric motor 26 is set initially, the leaf springs 39a, 39b will move as long as the tension is constant. The traveling speed can be set to the desired speed as described above.

Furthermore, in the above embodiment, the sludge m is transferred by vibration on the rectifying plate 17, but since this vibration angle is larger than that of a normal vibration conveyor, the transfer speed is small, but the vertical velocity component is large. Therefore, it is greatly affected by the fluidization effect,
It promotes the heat drying effect.

Furthermore, in the above embodiment, as shown in FIG. 5, the plate spring mounting members 38a and 38b are kept in a stable running state by the rollers 35, which allows the plate spring mounting members 39a and 38b to maintain a stable running condition.
, 39b are running on the lower running portion of the chain belt 32, their lower ends can press against the rectifying plate 17 in a predetermined state to perform the desired sludge scraping action. Even if the chain belts 36 and 37 have a predetermined tension, the plate springs 39a and 39b move up and down depending on the movement of the chain belts, and the lower ends of the plate springs 39a and 39b move up and down to the rectifying plate 17 with an accurate predetermined degree of deflection.
Although it cannot be pressed or scraped off, this roller 3
By the guiding action of 5, it is possible to provide the desired scraping action accurately.

Although the embodiments of the present invention have been described above, the present invention is of course not limited thereto, and various modifications can be made based on the technical idea of the present invention.

For example, in the vibration dryer of the above embodiment, a crank drive was used as the vibration drive unit, but of course,
The present invention is not limited thereto, and various conventionally known drive units may be used, such as an electromagnetic drive unit or a drive unit using a vibration motor. In addition, in the above embodiment, the current plate 1
In No. 7, the band plates 18 are connected with each other through the slits 19, but the present invention can also be achieved by using a rectifier plate in which a large number of round holes are formed with a certain aperture ratio, such as punch metal, instead. is of course applicable.

Furthermore, in the above embodiment, the leaf spring 3 for scraping
Although three leaf springs 9a and 39b are used as a set, of course, the width of these leaf springs may be made larger, for example, equal to the width of the strip plate 18, so that the width of the leaf springs can be scraped with one leaf spring. Furthermore, a set of a large number of leaf springs, for example, five or six leaf springs, may be used for scraping.

Further, in the above embodiments, the leaf spring is a general leaf spring, that is, made of steel, but is not limited to this, and may be made of synthetic resin, such as reinforced plastic (FRP), and has elasticity. It may be made of any material.

In the above embodiments, the present invention is applied to heating and drying sludge in a municipal waste treatment plant, but the present invention is of course applicable to heating and drying other materials.

[0036]

[Effects of the Invention] As described above, according to the vibration dryer of the present invention, the material to be dried is
In other words, even if the material is wetted with cooling water after incineration, such as ash, the openings of the rectifier plate will not be clogged, and the heating and drying action will be ensured continuously.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view of a vibration dryer applied to a municipal waste treatment plant according to an embodiment of the present invention.

FIG. 2 is a partially cutaway plan view of the vibration dryer.

FIG. 3 is a sectional view taken along line [3]-[3] in FIG. 2;

FIG. 4 is a cross-sectional view of essential parts of the vibration dryer.

FIG. 5 is a sectional view of a main part of the chain belt conveyor of the vibration dryer.

FIG. 6 is an enlarged vertical cross-sectional view of the main parts of the vibration dryer.

[Explanation of symbols]

1 Vibration dryer 4 Casing 11 Electric motor 12 Crank drive part 17 Current plate 18 Band plate 19 Slit 27 Chain 31a Drive sprocket wheel 31b Drive sprocket wheel 32 Chain belt 32a Driven sprocket wheel 32b Driven sprocket wheel 36 Chain belt 37 Chain belt 39a Leaf spring 39b Leaf spring 53 Sprocket wheel

Claims (2)

[Claims] 1. A casing in which a rectifier plate having a large number of openings is stretched, an air supply means for sending hot air from below the rectifier plate to an upward direction, and an air supply means disposed upward along the rectifier plate. The casing is vibrated to transport the material to be dried on the current plate, and the downward running portion of the chain belt is It travels in the same direction as the direction of transport by the vibration, and while the material to be dried is being transported, the material to be dried is heated by the hot air and rubbed by the lower end of the leaf spring. Vibration dryer. 2. The traveling speed of the leaf spring is approximately equal to the vibration-transfer speed of the material on the rectifier plate.
The vibration dryer described in.