JPS6336284B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a belt-type dewatering machine and a belt dehydrator for removing clogging of a belt installed in a paper machine.
In the process where the belt installed in the paper machine is reversed,
A cleaning device using an ultrasonic oscillator is applied to the back surface of the conveyed belt to remove various foreign particles contained in the processed material that has permeated the belt.

The belts currently installed in the above-mentioned dewatering machines and paper machines have been improved in terms of water squeezing performance, smoothness, and durability, and are designed to prevent clogging caused by various foreign particles contained in the processed material. The base fabric structure of the belt lowers water resistance, improves water permeability, and has a structure that takes into consideration non-compressibility. However, during the operation of the above-mentioned machine, various foreign particles contained in the processed material seep into the belt during the dehydration process, causing the belt to become clogged. This will reduce the dewatering performance of the machine. Therefore, all of the above-mentioned machines are equipped with a device for removing belt clogging. The system generally used for this purpose is to use a high-pressure shower to clean and remove clogging of the belt by spraying powerful water jets onto the conveying surface of the belt as it is being fed back. The jetting of water impacts the back surface of the belt, causing wear and tear on the belt, reducing the service life of the belt, and consuming a large amount of cleaning water.

The present invention eliminates these drawbacks, efficiently removes various foreign particles contained in the processed material that seeps into the belt, uses a small amount of water, does not damage the belt, and improves the water absorbency imparted to the belt. It is an object of the present invention to provide a cleaning device that maintains water permeability and performs efficient dewatering.

Next, in explaining the cleaning device according to the present invention, the general configuration of a belt type dehydrator will be explained for reference.

High moisture content sludge (hereinafter simply referred to as sludge) 2 dropped from the drop port 1a of the hopper 1 is conveyed by a conveyor belt 3 made of felt or other base material. The sludge 2 is conveyed to a compression mechanism 6 consisting of a press bottom roll (reverse feed roll) 5, and the water contained in the sludge 2 seeps into the belt 3 surface, and the water contained in the sludge 2 soaks into the belt 3 surface. Water is drained while flowing down from the water. When this reaches the compression mechanism 6 composed of the above-described both rolls 4 and 5, both rolls 4 and 5
The sludge 2 on the belt 3 is dewatered. The dewatered sludge cake adheres to the surface of the pre-stop roll 4 as it rotates, but is scraped off from the surface of the pre-stop roll 4 by a scraping knife 7 and collected at a predetermined location by a chute 8.

The belt 3 that has passed through the compression mechanism 6 is then reversely conveyed by a press bottom roll (reversely conveyed roll) 5 to undergo a reversely conveyed stroke, and this is transferred to the conveyor roll 9.
As a result, the process moves to the return conveyance process.

Then, when the sludge 2 reaches the location where the hopper 1 is installed, the sludge 2 is continuously dropped onto the belt 3 from the hopper drop-in port 1a as described above, but it moves to the reverse stroke and is returned by the feed roll 9. During the process leading to the conveying process, a pre-cleaning device 10, a high-pressure shower 11, and a squeezing device 12 are arranged for the belt moving to the reverse-feeding process to pre-clean the belt to be returned and conveyed, and then the high-pressure shower 11 The belt is sprayed with water to remove clogging and squeeze out the cleaning water, thereby restoring the belt's water absorbency and water permeability. (See Figure 1) Therefore, even in the process of conveying the sludge 2 to the location where the pre-stop roll 4 and press bottom roll (reverse feed roll) 5 are arranged, the water permeability of the belt 3 must be maintained well. As a result, various foreign particles contained in the sludge 2 placed on the belt 3 are mixed with the water drained from the sludge 2 and permeate into the belt 3.

In particular, when the sludge 2 placed on the belt 3 passes between the pre-stop roll 4 and the press bottom roll (reverse feed roll) 5, the sludge 2 placed on the belt 3 is compressed by the compression action of both rolls 4 and 5. As the sludge 2 is dehydrated, various foreign particles contained in the sludge mix with the water squeezed out by compression by both rolls and seep into the belt 3, causing the belt 3 to become clogged.

When this belt is returned as it is and transferred to the return conveyance process using the feed rolls, it is easy to imagine that the dewatering efficiency will decrease, and in order to prevent this decrease in efficiency, currently the above-mentioned methods are mainly used. According to the above-mentioned method, clogging of the belt is removed by washing, but this method is accompanied by the above-mentioned drawbacks.

Hereinafter, embodiments of the present invention developed to eliminate the above-mentioned drawbacks will be described.

The belt is immersed in the anti-feed path of the belt stretched in the dehydrator 12 or the paper machine, and the washing water supply device 13
A water tank 15 with a water tank 15 and a drain port 14 is disposed, and a large number of vibrators 17 are installed at the tip of an ultrasonic oscillator 16, which is equipped with an ultrasonic oscillator 16 that vibrates when energized and generates ultrasonic waves on the belt surface that moves through the water tank. strip nozzle 18
The water supply pipes 19 connected to the water supply pipes 19 are arranged as appropriate, and the end of the nozzle is exposed to the top surface, and a horn 21 having a large number of water fountain holes 20 formed on the top surface is connected via a connecting member or A cleaning device, which is connected by appropriate means without intervening water, is placed so as to be in contact with the bottom of the water tank.

The electrical connections of the washer are connected to an ultrasonic power source (not shown) through a circuit, and the water supply pipe 19 of the washer is connected to a water supply device (not shown) by a pipe or hose.

Since the present invention is configured as described above, when the present invention is arranged in the dehydrator 12 and the dehydrator 12 is driven, the belt stretched over the dehydrator 12 is conveyed and rotated, and the belt passes through the counter-feeding path. Washing water is discharged from the washing water supply device 13 into a water tank 15 arranged in
The overflowing wash water is drained from the drain port 14 of the water tank 15. Then, the washer placed from the bottom side of the water tank 15 to the surface of the anti-feed belt passing through the water tank is also energized and vibrated, and at the same time water is supplied from the water supply pipe. Water vibrated by ultrasonic waves is ejected from a large number of water fountain holes 20 formed on the surface of the horn 21 of the cleaner through branched nozzles.

Under this condition, the belt on which the sludge has been dewatered is reversely conveyed, passed through the water tank while being immersed in cleaning water filled in a water tank 15 disposed in the belt's reverse passage, and passed through the water tank in the direction of the feed roll. to move to.
Therefore, the belt that has been sent back will contain a large amount of cleaning water in the belt fabric during the process of passing through the water tank. The above-mentioned washer is arranged in the water tank so as to be seen from the bottom side of the tank so as to come into contact with the surface of the anti-feeding belt that is fed back through the water tank.

Cleaning water vibrated by ultrasonic waves is sprayed from this washer so as to come into contact with the surface of the belt that is moving backward through the water tank.

As a result, the cleaning water filled in the water tank generates micro vibrations due to ultrasonic waves, and the fabric of the belt that is immersed in this cleaning water and transferred back is cleaned in the process of transferring the cleaning water filled in the water tank. Micro-vibrations caused by ultrasonic waves are applied by contacting the horn surface of the washer, and at the same time a large number of water fountain holes 2 are drilled in the horn surface of the washer.
The belt is exposed to the jetting force of cleaning water that is sprayed with ultrasonic vibrations from zero, and various foreign particles contained in the sludge that has entered the mesh or weave of the belt fabric are removed from the belt. The mesh or weave of the fabric is torn by micro vibrations caused by the ultrasonic waves, and this is separated from the fabric of the belt toward the surface of the belt by the jetting force of the jetted water. As mentioned above, washing water is constantly supplied into the water tank to which this belt moves from the washing water supply device, and overflow water is discharged from the outlet. It is filled with vibrations. Therefore, when the belt in the above state moves through this water tank, the various debris contained in the sludge that separates from the fabric of the belt and grows on the surface of the belt are washed away by the washing water in the water tank. and is prevented from adhering to the belt surface.

This sludge is passed through a squeezing device in the process of being transferred from the water tank to the feed roll, where water is drained and transferred to the feed roll, where it receives the above-mentioned sludge from the hopper. Since the belt in this state has been washed and drained, it will function as a belt with its water permeability reversed and will function as a belt tensioned in this type of device.

The method of arranging the washer with the above-described structure so that it can be seen from the bottom side of the aquarium with respect to the surface of the belt that moves inside the aquarium is as shown in Figure 3. It is conceivable to arrange the washer in a fixed manner, or to raise the bottom of the aquarium as shown in Figure 4 and place the horn surface of the washer with the above structure peeking out from behind the raised bottom. However, the method of arrangement is not limited.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a conventional dehydrator equipped with a cleaning device. FIG. 2 is a schematic diagram of a washer installed in a cleaning device according to the present invention. FIGS. A schematic diagram of the configuration of the device. 3...belt, 6...compression mechanism,
12... dehydrator, 15... water tank, 17... vibrator, 21... horn.

Claims (1)

[Claims] 1 The belt is immersed in the anti-feed passage of the belt stretched in the dehydrator 12 or the paper machine, and the washing water supply device 1
3 and a water tank 15 equipped with a drain port 14, and at the tip of a vibrator 17 equipped with an ultrasonic oscillator 16 that vibrates when energized and generates ultrasonic waves on the belt surface that moves through the water tank. Multi-line nozzle 1
8 are connected to the water supply pipes 19, and the end of the nozzle is exposed to the top surface, and a horn 21 having a large number of water fountain holes 20 formed on the top surface is connected to the horn 21 through a connecting member or 1. A belt cleaning device characterized in that a cleaning device, which is connected to the water tank by suitable means without intervening the water tank, is arranged so as to be in contact with the bottom surface of the water tank.