JP2000329321A - Waste disposal apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate exchange of a member serving to rotatably support a stirring tool for stirring waste that is heated and baked in a disposal chamber provided in a heating chamber. SOLUTION: A rotary shaft 31 of a stirring tool 21 penetrates a disposal chamber 16 and a heating chamber 18 and protrudes its tip end to the outside of the heating chamber 18. The tip end and a coating member 35 for covering the neighborhood of the tip end are mounted detouchably on the rotary shaft 31 from the outside of the heating chamber 18, and the tip end of the rotary shaft 31 is rotatably supported on a member forming the heating chamber 18 through the coating member 35 with the aid of a stirring bearing 39 removable from the outside of the heating chamber 18. In such a construction, since the rotary shaft 31 is supported on the stirring bearing 39 through the coating member 35, the coating member 35 and the stirring bearing 39 are slid to cause weariness therebetween while the stirring tool 21 is rotated, but those members are detouchable from the outside of the heating chamber 18 so that they are easily exchanged even when they are worn.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste treatment apparatus for reducing the amount of waste by steaming the waste.

[0002]

2. Description of the Related Art Conventionally, there is a waste treatment apparatus in which waste is steamed and carbonized, and gas generated when the waste is steamed is burned. As an example of such a waste disposal apparatus, there is an apparatus having a primary combustion chamber 1 as shown in FIG. 5 and a secondary combustion chamber (not shown). The primary combustion chamber 1 has a double structure including a processing chamber 2 and a heating chamber 3 surrounding the processing chamber 2. The waste is stored in the processing chamber 2, and is steamed by heating the heating chamber 3 by a heating means (not shown) to generate gas. The secondary combustion chamber is disposed above the primary combustion chamber 1,
The double communication pipe 4 communicates with the primary combustion chamber 1 and the processing chamber 2
The gas generated in step is burned to make it odorless.

[0003] Such a waste treatment apparatus includes a treatment chamber 2.
Inside, a stirrer 5 for stirring the waste is provided. The waste stored in the processing chamber 2 is uniformly heated by the stirring device 5 evenly.

[0004] Here, the stirring tool 5 is rotatably supported by a support shaft 6 attached to the processing chamber 2 slidably penetrating through a bearing 7. The spindle 6 and the bearing 7 slide without lubrication in a high temperature atmosphere of about 300 to 400 ° C., and waste enters into the sliding surface between the spindle 6 and the bearing 7. Wear of the support shaft 6 and the bearing 7 is inevitable.

[0005]

At the time of manufacture, the stirrer 5 holds the processing chamber 2 even when it is closest to the inner peripheral surface of the processing chamber 2.
When the support shaft 6 and the bearing 7 are worn, the stirrer 5 is lowered, so that the stirrer 5 is moved down to the inner circumference of the processing chamber 2. Touch the surface. When the stirrer 5 comes into contact with the inner peripheral surface of the processing chamber 2, noise occurs, and the inner peripheral surface of the processing chamber 2 is shaved by the stirrer 5, and further, a load is applied to the motor that rotates the stirrer 5. There are inconveniences such as.

As an example of a countermeasure to this inconvenience, it is conceivable to attach the stirrer 5 slightly above an appropriate position in consideration of the fact that the stirrer 5 shifts downward. And the inner peripheral surface of the processing chamber 2 becomes large, and waste is deposited there, causing another inconvenience that the deposited waste may not be sufficiently treated.

Therefore, before the stirrer 5 comes into contact with the inner peripheral surface of the processing chamber 2, the support shaft 6 and the bearing 7 are replaced. In the conventional structure shown in FIG. Unless the lid 8 is removed and the stirrer 5 is pulled out to the right in FIG. 5, the support shaft 6 and the bearing 7 cannot be replaced. In addition, since a motor (not shown) for driving the stirring tool 5 to rotate is connected to the sprocket 9 on the outside of the lid 8, it takes time to remove and re-attach the sprocket.

An object of the present invention is to facilitate replacement of a member for rotatably supporting a stirrer.

[0009]

According to a first aspect of the present invention, there is provided a waste processing apparatus provided in a heating chamber heated by a heating means, for steaming or burning stored waste, and the processing chamber. In a waste treatment apparatus having a stirrer that rotates and stirs the waste, a rotating shaft of the stirrer penetrates the heating chamber to project a tip end out of the heating chamber, and the rotating shaft has A detachable covering member is attached from the outside of the heating chamber to cover the distal end portion and the vicinity thereof, and the rotating shaft is attached to a member forming the heating chamber through the covering member by a stirring bearing detachable from the outside of the heating chamber via the covering member. Is rotatably supported.

Therefore, since the rotating shaft is supported by the stirring bearing via the covering member, when the stirring tool rotates, the covering member and the stirring bearing slide, and the covering member and the stirring bearing are worn. . The covering member and the stirring bearing are detachable from the outside of the heating chamber without disassembling the members forming the heating chamber and the processing chamber, so that they can be easily replaced even if worn.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a waste disposal apparatus according to the present invention will be described with reference to FIGS. First, FIG. 1 is a vertical sectional front view showing a schematic structure of a waste disposal apparatus 10 of the present embodiment, and FIG. 2 is a vertical right side view thereof.

The waste treatment apparatus 10 has a lower tank 12 and an upper tank 13 in an outer case 11, and an inner tank 14 is housed in the lower tank 12. Here, an exploded perspective view of the lower tank 12 is shown in FIG. The inner tank 14 is supported on one side of the lower tank 12 in a cantilever state. This inner tank 14 has a waste inlet 15
The inside of the inner tank 14 is a steaming chamber 16 serving as a processing chamber for storing waste and steaming the waste.
It has been. An opening / closing door 17 (FIG. 3)
Reference).

Inner peripheral surface of lower tank 12 and inner tank 14
A space is formed between the steaming chamber 16 and the outer peripheral surface of the inner tank 14. The space is a heating chamber 18 for heating the steaming chamber 16 from outside the inner tank 14. The lower tank 12 is provided with a steaming burner 19 as a heating means and a cooling blower 20 for taking in outside air.

The steaming chamber 16 is provided with a rotatable stirrer 21 for stirring the waste stored in the steaming chamber 16. The stirrer 21 includes a pair of support plates 22 and a stir bar 23 connecting the support plates 22. A support shaft 24 is fixed to the center of one support plate 22, and the support shaft 24 is held via a bearing 26 on an end plate 25 that closes one end of the inner tank 14. End plate 2
Sprocket 27 is attached to the tip of support shaft 24 protruding from
Is fixed, and a chain 30 is stretched between the sprocket 27 and a sprocket 29 fixed to the motor shaft of the stirring motor 28.

FIG. 4 is a vertical sectional front view of the lower tank 12 showing a support structure of a support shaft 31 which is a rotation shaft fixed to the center of the other support plate 22. On the opposing surfaces of the end plates 25 of the steaming chamber 16 and the lower tank 12, through holes 32, 33 having the same diameter are formed.
A tube 34 having substantially the same outer diameter as that of the through holes 32, 33 is fitted into the tubes 2, 33. The support shaft 31 is a stepped shaft having a small diameter at the tip end, and the small diameter portion is covered with a shaft collar 35 as a covering member. The shaft collar 35 is fixed to the support shaft 31 with a screw 36 at the end face. The outer diameter of the shaft collar 35, the outer diameter of the thick shaft portion 37 of the support shaft 31, and the inner diameter of the tube 34 are substantially equal, and the shaft collar 35 and the thick shaft portion 37 are fitted into the tube 34. The tip of the shaft collar 35 projects out of the lower tank 12, and a stirring bearing 39 having a support hole 38 for rotatably supporting the tip of the shaft collar 35 is fixed to an end face of the lower tank 12 by a screw 40. ing.

An outlet 41 is provided below the end plate 25 for scraping the carbonized waste after the treatment.

A gas combustion chamber 42 is formed in the upper tank 13, and a heat insulating material 43 is provided on an inner peripheral surface of the gas combustion chamber 42. The steaming chamber 16 and the gas combustion chamber 42 are communicated with each other by an inner pipe 44 rising from the inner tank 14, and gas generated by steaming waste in the steaming chamber 16 is supplied to the inner pipe 44. The gas flows into the gas combustion chamber 42 through the inside 44.

The heating chamber 18 and the gas combustion chamber 42 are
4 are communicated with each other by an outer tube 45 surrounding the outer periphery. A combustion space 46 and a buffer space 47 are formed in the gas combustion chamber 42. The combustion space 46 is a region where the inner pipe 44 and the outer pipe 45 communicate with each other, and is surrounded by a sleeve 48 extending from the bottom surface in the gas combustion chamber 42 to the vicinity of the ceiling. Further, a combustion burner 49 as a combustion means is arranged on an outer peripheral portion of the sleeve 48 so as to face the outer periphery. The volume of the combustion space 46 is set to a size corresponding to the capacity of the combustion burner 49, and the heat from the combustion burner 49 and the outer tube 45.
In order to be able to maintain the temperature in the combustion space 46 at about 900 ° C. by the heat from the steaming burner 19 flowing through the inside, it is formed smaller than the volume of the buffer space 47.

Here, when the capacity of the combustion burner 49 is small, the volume of the combustion space 46 is reduced accordingly, and the temperature in the combustion space 46 is reduced even if the combustion burner 49 having a small capacity is used. Maintain at least about 900 ° C.

Above the upper tank 13, a buffer space 47 is provided.
An exhaust tower 50 is formed which communicates with the atmosphere. In the buffer space 47, partition walls 51 projecting from the inner peripheral surface of the upper tank 13 in mutually opposite directions are provided. Then, in the buffer space 47, the gas partitioned by these partition walls 51 and passing through the combustion space 46 is filled with the exhaust tower 5
A flow path is formed so that the time to reach zero takes at least 2 seconds or more. Further, by providing the heat insulating material 43 on the inner peripheral surface of the gas combustion chamber 42, the temperature of the gas flowing through this flow path is maintained at about 900 ° C. When the temperature in the gas combustion chamber 42 reaches a desired temperature, the burner is repeatedly fired and ignited to keep the temperature within an allowable range.

Steaming burner 19 and combustion burner 4
Reference numeral 9 denotes a fan (not shown) for taking in outside air to obtain oxygen for burning fuel. These fans are turned ON / OFF in conjunction with ignition / extinguishing of the steaming burner 19 and the combustion burner 49. It is turned off.

The lower tank 12 is provided with a cooling on-off valve 52 which is opened in the cooling process after the waste treatment process is completed, and the upper tank 13 is provided with a cooling fan 53 also used for cooling. Is provided.

The waste treatment apparatus 10 is provided with a microcomputer (not shown) for various controls and an operation panel (not shown) having a start key for starting waste treatment. The microcomputer is a CP (not shown)
U, ROM and RAM are provided. Various programs are stored in the ROM, and the CPU controls each unit according to the programs. The RAM temporarily stores various information, and a part of the area is used as various counters or the like. A series of processes in the waste disposal are automatically performed by an operator operating a start key and controlled by a microcomputer according to a program.

In such a configuration, first, when the waste to be treated is put into the steaming chamber 16 through the waste inlet 15 and the start key is operated, the waste treatment apparatus 10 starts the waste treatment. Then, the steaming burner 19 and the combustion burner 49 are ignited. Further, the agitation motor 28 is driven as necessary, and the agitator 21 is rotated to agitate the waste in the steaming chamber 16.

When the temperature inside the heating chamber 18 rises, the temperature inside the steaming chamber 16 also rises with the rise in the temperature inside the heating chamber 18, and the waste housed in the steaming chamber 16 is steamed. From the waste, water evaporates first, then
Gas is generated. This gas flows into the combustion space 46 in the gas combustion chamber 42 through the inner pipe 44. Also,
The outside air taken into the heating chamber 18 by the fan provided in the steaming burner 19 is preheated in the heating chamber 18, and the preheated warm air passes through the outer pipe 45 and is required to burn the gas. The gas is supplied to the combustion space 46 of the gas combustion chamber 42 as auxiliary combustion air for taking in sufficient oxygen.

The combustion space 46 is heated by the heat from the combustion burner 49, and the internal temperature is raised to about 900 ° C. by the flow of hot air from the heating chamber 18. For this reason, the gas generated from the waste in the steaming chamber 16 and flowing into the combustion space 46 through the inner pipe 44 spontaneously ignites from a point in contact with the inner peripheral surface of the sleeve 48 where the temperature is highest, and smoothly. Combustion is started. Here, since the outer tube 45 surrounds the inner tube 44, the heating chamber 18
The auxiliary air supplied through the outer pipe 45 from the
Since the gas works to suck out the gas, the discharge of the gas from the steaming chamber 16 is promoted. The gas whose combustion has been started in the combustion space 46 passes through the combustion space 46 and flows into the buffer space 47 while burning, flows along a flow path formed by being partitioned by the partition wall 51, and flows out of the exhaust tower 50. Exhausted.
Since the combustion of the gas in the buffer space 47 has been started in the combustion space 46, the temperature has increased.

Since the heat insulating material 43 is provided on the inner peripheral surface of the gas combustion chamber 42 including the buffer space 47, the buffer space 47 is provided.
It is difficult for the heat inside to transfer to the outside of the upper tank 13,
Since the inside of the buffer space 47 is partitioned by the partition wall 51, heat in the buffer space 47 does not easily escape from the exhaust tower 50. For this reason, the burning gas that has flowed into the buffer space 47 flows along the flow path formed by partitioning the partition wall 51, so that the flowing distance of the burning gas is increased and the exhaust tower 50 is discharged.
Takes at least 2 seconds to reach. Therefore, the fuel gas passes through the combustion space 46 and passes through the buffer space 4.
By maintaining the burning gas flowing into 7 at a temperature of about 900 ° C. for at least 2 seconds, the gas is completely burned, the unburned gas is not discharged into the atmosphere, and the generation of an odor is prevented.

At a point in time when a predetermined time has elapsed since the start of the processing of the waste and gas is no longer generated from the waste put into the steaming chamber 16, the steaming burner 19 and the combustion burner 49 are stopped. Then, the lower tank 12 is cooled. At this time, the cooling on-off valve 52 is opened, and then the cooling blower 2 is opened.
0 is operated to take in the outside air into the heating chamber 18 and exhaust the air in the heating chamber 18. After cooling, the carbonized waste remaining in the steaming chamber 16 is scraped out from the waste inlet 15 to complete the waste treatment.

In such a waste disposal apparatus 10, the stirrer 21 is driven to rotate as required. Here, the stirrer 21 is rotatably supported in the steaming chamber 16 by the shaft collar 35 covering the tip of the support shaft 24 of the stirrer 21 being supported by the support hole 38 of the stirrer bearing 39. . Therefore, when the stirrer 21 is rotationally driven, the sliding surface between the shaft collar 35 and the stir bearing 39 is worn. In the present embodiment, both the stirring bearing 39 and the shaft collar 35 can be removed by removing the screws 40, 36. That is, since the lower tank 12 can be removed from the outside without disassembling the lower tank 12, The man-hour for replacement work is small, and even if worn, it can be replaced easily in a short time. Therefore, even if the agitator 21 is prevented from coming into contact with the inner peripheral surface of the inner tank 14 by, for example, periodically replacing the shaft collar 35 and the agitating bearing 39, the time required for the operation is shorter than that in the related art. Costs can be reduced.

In this embodiment, since the thick shaft portion 37 of the rotating shaft 31 is fitted to the cylinder 34, the stirring bearing 39
Is removed, the stirrer 21 is supported by the fitting of the thick shaft portion 37 and the cylinder 34, and the stirrer 21 does not fall down and abut on the inner peripheral surface of the inner tank 14.
5 can be easily attached. Furthermore, since the tip of the rotating shaft 31 protrudes outside the lower tank 12, when the shaft collar 35 is attached, the rotating shaft 31 can be easily inserted by using the tip of the rotating shaft 31 as a guide. It does not fall into the lower tank 12.

In the present embodiment, the shaft collar 35
Since the structure is such that waste does not easily enter the sliding surface between the bearing and the stirring bearing 39, the sliding surface is less likely to be worn as compared with the conventional structure. Even if waste enters between the cylinder 34 and the thick shaft portion 37 and the cylinder 34 and the thick shaft portion 37 are worn, the shaft collar 35 and the stirring bearing 39 are replaced according to the respective wear conditions. Since the height of at least the distal end of the rotating shaft 31 is maintained in an appropriate range, the agitator 21 can be prevented from contacting the inner peripheral surface of the inner tank 14.

In the present embodiment, the shaft collar 35 and the stirring bearing 39 are fixed to the support shaft 31 and the lower tank 12 by fixing them with the screws 36 and 40.
In practice, the shaft collar 35 is provided by other fixing means.
Alternatively, the stirring bearing 39 may be fixed and detachable.

[0033]

According to the first aspect of the present invention, the rotating shaft of the stirrer penetrates the heating chamber so that the tip projects outside the heating chamber, and the rotating shaft is detachable from the heating chamber that covers the tip and its vicinity. The rotating shaft is rotatably supported at the tip end portion by a stirring member that is detachable from the outside of the heating chamber to the member forming the heating chamber through the covering member. Supported by a stirring bearing, when the stirring tool rotates, the coating member and the stirring bearing slide, and the coating member and the stirring bearing wear, but when replacing these,
The covering member and the stirring bearing are detachable from the outside of the heating chamber without disassembling the members forming the heating chamber and the processing chamber, so that they can be easily replaced even if worn. Therefore, the covering member and the stirring bearing that protect the rotating shaft are periodically arranged so that the agitating tool does not come into contact with the inner peripheral surface of the processing chamber because the position of the stirring tool is lowered due to wear of the rotating shaft. Even if it is exchanged, the time and cost of the work can be reduced.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of a waste disposal apparatus of the present invention.

FIG. 2 is a vertical right side view thereof.

FIG. 3 is an exploded perspective view of a lower tank.

FIG. 4 is a vertical sectional front view of a lower tank showing a mounting structure of a stirrer.

FIG. 5 is a vertical sectional front view of a primary combustion chamber showing an example of a mounting structure of a stirrer provided in a conventional waste treatment apparatus.

[Explanation of symbols]

 Reference Signs List 16 processing chamber 18 heating chamber 19 heating means 21 stirrer 31 rotating shaft 35 coating member 39 stirring bearing 42 gas combustion chamber 49 combustion means

Claims (1)

[Claims] 1. A waste provided in a heating chamber heated by heating means and provided with a processing chamber for steaming or burning stored waste, and a stirrer rotating in the processing chamber to agitate the waste. In the processing apparatus, the rotating shaft of the stirrer penetrates the heating chamber to project a tip end out of the heating chamber, and the rotating shaft has a covering member that covers the tip end and its vicinity and is detachable from the outside of the heating chamber. A waste treatment apparatus, wherein the rotating shaft is rotatably supported at its tip end by a stirring bearing that is attached to and detachably attached to a member forming the heating chamber from outside the heating chamber via the covering member.