JPS5849298B2 - Cleaning operation method of centrifugal dewatering machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cleaning operation method suitable for a centrifugal dewatering machine in equipment for processing food waste such as kitchen waste.
The purpose is to provide a highly effective operating method that can clean every nook and cranny of the internal case in order to sufficiently discharge the waste residue that adheres to the dehydration case during the dehydration process. .

The present invention will be described below with reference to a centrifugal dehydrator in a garbage processing facility.

First, a system as shown in FIG. 1 has been developed and proposed as a garbage processing facility.

In the figure, 1 is a garbage crusher that serves as a disposer installed in a cafeteria kitchen in a building, 2 is a centrifugal dewatering machine that is the subject of the present invention and is installed in a garbage disposal area, 3 is a conveyance pump, and 4 is a A water supply source, 5 is a garbage collection container, and 6 is a sewage drain, which are connected by a garbage conveying pipe 7, a drainage pipe, and a pipe 8 as shown in the figure.

In such processing equipment, if each machine is put into operation and food waste A is fed into the crusher 1, the food waste will be finely crushed,
Furthermore, the slurry-like mixture is formed with the water supplied from the water supply source 4, and is conveyed to the dehydration treatment machine 2 via the conveyance pump 3.

On the other hand, the slurry-like garbage supplied to the dehydrator 2 is dehydrated and then collected into the collection container 5 as garbage dregs.

The dehydrated and separated water is drained into the drainage ditch 6.

This type of garbage processing equipment makes it possible to transport large amounts of garbage to distant locations via pipes, and the volume and weight of dehydrated garbage dregs are significantly reduced compared to kitchen garbage. It is advantageous in that it is convenient to dispose of and can be easily incinerated.

The detailed structure of the centrifugal dehydrator 2 in the garbage processing equipment is shown in FIGS. 2 and 3.

That is, this structure is a well-known continuous processing type centrifugal dehydrator, and a mortar-shaped centrifugal cage 11 that is rotationally driven by a motor 10 is housed in a dehydration case 9, and a case is located in the inner area of the centrifugal cage 11. A dust conveying pipe 7 is introduced from above the case 9, and a drainage pipe 8 is led out from the bottom of the case 9 in the outer area.

The waste dregs discharge port 12 is opened at the tip of a dregs discharge port cover 13 that communicates with the inside of the centrifugal heel 11 and protrudes radially from the main body of the case 9.

The garbage collection container 5 is placed opposite to the dregs discharge port 12. 3. Reference numeral 14 is an auxiliary basket without holes that is rotatably driven and is arranged concentrically inside the centrifugal basket 11 at a distance. A bottleneck is formed between the centrifuge and the centrifugal shaft 11 to provide a squeezing action to increase the dewatering efficiency.

Further, 15 is a water supply pipe for washing water, the details of which will be described later.
It is connected to the water supply source 16 via a solenoid valve 17, and its tip is connected to the end of the slurry conveying pipe 7 and the auxiliary basket 1.
4 has a branch opening on the top surface.

As is well known, the operation of the centrifugal dewatering machine 2 is such that the slurry supplied via the waste conveying pipe I is dehydrated during the process of moving through the centrifugal cage 11, and the water that passes through the filter holes of the centrifugal cage 11. is discharged into the drain via the drain pipe 8, while the dehydrated lees is discharged into the collection container 5 through the lees discharge port 12.

However, during the above-mentioned dehydration processing operation, the waste particles as the material to be dehydrated are scattered in all directions within the case 9, and the centrifugal cage 11
, 14, adheres to the periphery of the centrifugal basket and the inner surface of the dregs discharge port 13.

In particular, raw garbage such as kitchen waste is sticky, and it is unavoidable for garbage residue to adhere to the inside of the machine.

On the other hand, for hygienic considerations in processing equipment that handles food waste, at least once a day, when the food waste processing process is completed, the waste dregs remaining inside the dehydrator 2 are cleaned and removed. It needs to flow outside.

As such a cleaning method, a method has already been proposed and implemented in which a large amount of cleaning water is supplied from the water supply source 16 through the cleaning water supply pipe 15 while the motor 10 is operating.

According to this method, washing water is supplied to the centrifugal cage 11 and the auxiliary cage 1.
It is scattered by the centrifugal force from the periphery of the case 40 and collides with the dirt particles remaining on various parts of the case, thereby being washed away and discharged from the dirt discharge port 12 along with the washing water.

However, in the conventional cleaning process, the motor rotates in a fixed direction in the same direction as arrow P as during dehydration processing, and in this conventional cleaning operation method, when actually cleaning There is a problem in that the dust and dirt cannot be completely discharged, and a considerable amount of dust and dirt remains attached to the case, and a solution to this problem is desired.

As a result of various studies, it has been found that the following causes are responsible for the phenomenon in which dirt particles adhere and remain after such washing.

That is, when washing water is supplied while the centrifugal cage is rotating, the washing water is given directionality in the tangential direction to the rotational direction P by the centrifugal force exerted by the centrifugal cage and scatters.

As a result, a blind area is created in the direction of the washing water scattering, and the scattered washing water does not directly reach this part.

Of course, the cleaning water splashes into this blind spot, but since it bounces off the walls of other cases, its momentum has decreased and there is almost no cleaning effect.

The only substance that has a substantial cleaning effect is the cleaning water that is directly subjected to centrifugal force, scatters, and collides with the remaining dirt and debris.

In particular, in the lees discharge path in the lees discharge port lid 13 that protrudes radially from the dehydration case body, the diagonally shaded area C in the lid 13 is washed away by washing water splashing in the direction of arrow B as shown in Fig. 4a. Instead, the dirt and dregs remain attached to this shaded area C.

The purpose of the present invention is to solve the above-mentioned drawback of the conventional cleaning operation method in which dirt and dregs remain, and to obtain an advantageous cleaning operation method that can perform complete cleaning. This is achieved by performing the cleaning process separately in a forward rotation cleaning process and a reverse rotation cleaning process.

In this case, switching operation control between the forward and reverse cleaning steps can be automated by switching the centrifugal cage drive motor between forward and reverse operation under timer control.

Next, the method of the present invention will be explained in detail based on the drawings.

First, the cleaning operation of the present invention is shown in a time chart as shown in FIG.

That is, after the dehydration process in the centrifugal dehydrator is completed, the cleaning process begins.

During this cleaning process, the water supply electromagnetic valve 17 is opened and cleaning water is supplied, while the motor 10 is controlled to switch from normal rotation to reverse rotation during the cleaning process.

According to this cleaning operation method, first, as shown in FIG. 4a, a centrifugal cage is rotated in the direction of arrow P in a forward rotation cleaning process, leaving a hatched area C which is a blind spot for the cleaning water flow B, and performing the dehydration treatment process. The remaining dirt and grime remaining during this process is washed and discharged.

Next, when a predetermined period of time has elapsed, the rotational direction of the motor 10 is switched, and if the reverse cleaning process begins in the direction of arrow Q as shown in Figure 4, the cleaning water flow will change as shown by the arrow ``in accordance with the switching of the rotational direction of the motor.'' As a result, the shaded area C, which is a blind spot in the forward rotation cleaning process, can be completely cleaned.

This switching of the washing water flow stops only inside the dregs discharge port 13, and also works in the same way on the centrifugal basket inside the case 90 main body and various places around the centrifugal cage, and as a result, the washing water flow is completely inside the machine without creating a blind spot can be washed to remove dirt and debris.

Next, an embodiment of the switching control method for the cleaning process will be described with reference to FIGS. 6 and 7.

Figure 6 shows the main circuit, Figure 7 shows the control circuit,
In the figure, Me1゜MC2 is an electromagnetic switch for forward/reverse switching of the motor 10, BS is a push button switch for cleaning command, TDRl,
TDR2 is a timer for setting forward cleaning time and reverse cleaning time, R is an auxiliary relay, and THR is a thermal relay.

As is clear from the illustrated circuit, after the dewatering process, when the push button switch BS is turned on, the cleaning process begins, and when the cleaning water supply starts, the motor 10 is automatically activated during the cleaning process by the operation of timers TDR1 and TDR2. The rotation is switched from the rotation to the reverse rotation, and the cleaning process is performed as shown in the time chart of FIG. 5 mentioned above.

As described above, according to the present invention, the washing process of the centrifugal dewatering machine is divided into a forward washing process and a reverse washing process, and the centrifugal cage is operated in a switching manner in the middle of the washing process, so that the washing water flow is scattered and discharged into the case. There will be no blind spots,
Therefore, the inside of the dehydration case can be completely cleaned up to the sludge discharge port, and the sludge of the dehydrated material that remains attached to the case will not be left behind (the practical effect of discharging silt to the outside of the machine is achieved). .

It should be noted that the present invention is not limited to the centrifugal dehydrator used in the illustrated garbage processing equipment, but can of course be applied to cleaning centrifugal dehydrators used in other fields.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of the garbage processing equipment, Fig. 2 is a vertical cross-sectional view of the centrifugal dewatering machine to which the present invention is implemented, and Fig. 3 is the system diagram of the garbage processing equipment.
4a and 4b are explanatory diagrams of the cleaning operation, FIG. 5 is a time chart of the method of the present invention, and FIGS. 6 and 7.
The figure shows an electric main circuit and its control circuit for carrying out the method of the present invention. 1: Garbage crusher, 2: Centrifugal dehydrator, 7: Transport and supply pipe for dehydrated material, 9: Dehydration case, 10: Drive motor, 11: Centrifugal basket, 12: Dregs discharge port, 15: Washing water Water supply pipe, 16: Cleaning water supply source, 17: Solenoid valve for cleaning water supply, P: Forward direction of motor, Q: Reverse direction, MC
12MC2: Electromagnetic switch for motor forward/reverse switching operation.

Claims (1)

[Scope of Claims] 1. A centrifugal device that includes a mortar-shaped centrifugal cage that is rotatably driven within a dehydration case, and continuously dehydrates the material to be dehydrated that is supplied into the centrifugal cage and discharges it from the lees discharge port of the case. For dehydration processing machines, after dehydration processing, the centrifugal cage is rotated and washing water is supplied into the case, and the remaining lees adhering to the case are discharged from the lees outlet along with the washing water. A washing operation method for a centrifugal dewatering machine, characterized in that the washing process is carried out separately in a forward rotation washing process and a reverse rotation washing process. 2. The washing operation method according to claim 1, wherein the forward rotation washing step and the reverse rotation washing step are performed by switching the centrifugal cage drive motor between forward and reverse rotation under timer control. How to operate a dehydrator for cleaning.