JP2003021461A - Sealing structure at outlet part or inlet part of external heating rotary kiln - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel structure where a retort elongates/contracts during operation and suspension and completely seals the outlet part or inlet part of a rotating rotary kiln during operation to supply a heat treated matter to the outside of a discharge tube. SOLUTION: A moving body 34 is provided on the side of the outlet part or the inlet part of a retort 2 projecting from the furnace body to move in parallel with the axial direction of the retort 2 as it elongates/contracts, and a ring-like holding plate 30 having a sliding face 42 (protrusion) is provided to be slid airtightly on the end face of the retort 2 through a sealing material 22 by the resiliency of a spring 46 fixed to the moving body 34. Central hole of the holding plate 30 is connected airtightly with a discharge tube 4 on the outlet side or with an introduction tube on the inlet side, through a flexible tube 64.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention seals an outlet portion or an inlet portion of an external heat type rotary kiln that is heated and stretched during operation, and cooled and contracted at rest to prevent outside air from entering the retort. The present invention relates to a structure for dropping an object to be heat-treated into an exhaust device or supplying an unheated object from an introduction device into the retort while preventing leakage of gas in the retort.

[0002]

2. Description of the Related Art Conventionally, as a seal structure for an outlet or an inlet of an external heat type rotary kiln, Japanese Patent Laid-Open No. 6-2 is known.
As described in Japanese Patent No. 81348, a labyrinth is often used, but the labyrinth increases flow path resistance and suppresses gas flow, and cannot be completely sealed.

[0003]

SUMMARY OF THE INVENTION According to the present invention, the retort expands and contracts during operation and rest, and the outlet or inlet of an externally heated rotary kiln that rotates during operation is almost completely sealed and heated in the retort. It is an object of the present invention to provide a new structure in which a processed object to be heat-treated is dropped into a discharge device or an unheated object is supplied from an introducing device into a retort.

[0004]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems, and the invention of claim 1 is such that the retort of the retort projecting from the furnace body is located laterally of the outlet or the inlet. A moving body that moves in parallel with the axial direction of the retort according to expansion and contraction is provided, and a ring-like shape that has a sliding contact surface that airtightly contacts with the end surface of the retort through the sealing material by the elastic force of the spring mounted on the moving body. A holding plate is provided, and a central hole of the holding plate is airtightly connected to the discharge device on the outlet side via a flexible tube or to the introducing device on the inlet side via a flexible tube.

According to a second aspect of the present invention, the end portion on the outlet side or the inlet side of the retort is a double pipe having a gap in the radial direction, and the double pipe is held by a holding plate on the outer peripheral surface of the outer pipe. One or more elastic sealing materials are fitted so as to be rotatable relative to each other, and the center hole of the holding plate is attached to the discharge device on the outlet side via a flexible tube or the flexible tube to the introducing device on the inlet side. It was configured to be connected airtightly via.

According to a third aspect of the present invention, in the second aspect of the invention, one or more pairs of elastic sealing materials having a pair in the axial direction of the retort with a gap therebetween are fitted.
Grease was injected into the gap.

According to a fourth aspect of the invention, in the second or third aspect of the invention, a liquid or gas for cooling is blown between the outer pipe and the inner pipe of the double pipe.

[0008]

According to the first aspect of the present invention, since the holding plate is slidably contacted with the end face of the retort through the sealing material by the elastic force of the spring mounted on the moving body, the gap between the end face of the retort and the holding plate is increased. Is almost completely sealed, and since the central hole of the holding plate and the discharging device or the introducing device are airtightly connected to each other through the flexible tube, expansion and contraction of the retort can be absorbed.

According to a second aspect of the present invention, since one or more sealing materials having elasticity are fitted to the outer tube so as to be rotatable relative to each other, the end portion on the outlet side or the inlet side of the retort is fitted to the outer tube in a relatively rotatable manner. By using a sealing material having a low temperature and high elasticity such as rubber, it is possible to reliably seal.

According to the third aspect of the present invention, since the two sealing members are fitted with a gap therebetween and grease is injected into the gap, seizure of the sealing member can be prevented.

According to the fourth aspect of the present invention, since the cooling liquid or gas is blown between the double pipes, the double pipes can be cooled and the seizing of the sealing material can be prevented more reliably.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which the present invention is applied to an outlet portion of a rotary kiln will be described below with reference to FIGS. FIG. 1 shows an outlet-side end of a retort 2 protruding from a furnace body (not shown) and a discharge device 4 secretly connected to the retort 2. The retort 2 has a ring 6 fixed to its outer circumference.
Is rotatably supported by two rollers supported in parallel with the first stand 8 and is capable of small axial movement.

A stirring plate 3 is fixed to the inner peripheral surface of the retort 2 and a tapered barrel 12 is formed at the inner periphery of the end of the retort 2 and a cylinder 16 is connected to the end thereof. A stirring plate 14 is obliquely fixed to the inner peripheral surface of 12 to send the object to be heated conveyed by the inclination of the retort 2 to the cylinder 16 side, and a ribbon screw 18 is installed in the cylinder 16. The heat-treated product is dropped into the discharge device 4.

The inside of the end of the retort 2 is fixed to the cylinder 16, a sealing material 22 such as asbestos is fitted to the end surface of the collar 20 that projects outward, and a gap 24 is provided on the outer periphery of the collar 20. A cylinder 26 is formed, and a nozzle 28 that directs the gap and ejects cooling water is arranged.

Reference numeral 30 is a ring-shaped holding plate, and a bolt 32 penetrating the outer periphery of the holding plate 30 has a hole 3 of a moving body 34 described later.
6 and a nut 38 screwed to the protruding end.
The protrusion 42, which is the sliding surface of the present invention, is pressed against the seal member 22 by the elastic force of the compression coil spring 40 mounted between and.

A collar 44 having an L-shaped cross section is integrally formed with the holding plate 30, and is formed between two rubber seal members 48 and 50, which are rotatably fitted to the outer cylinder 26, and on the outside of the seal member. The rings 52 and 54 are overlapped and fastened with bolts 56, and a grease nipple 58 is attached to the metal ring 52 sandwiched between the sealing materials 48 and 50.
Grease is filled between the sealing materials 48 and 50.

As shown in FIGS. 3 to 6, the discharge cylinder 4 is fixed by arms 62 to the second stands 60 provided on both sides of the end portion of the retort 2 and is heat-resistant between itself and the holding plate 30. The flexible tubes 64 are airtightly connected.

Next, the assembly structure of the moving body 34 is shown in FIG.
6 to 6. A rail 66, which is substantially parallel to the axis of the retort 2, is fixed to the second stand 60, and a roller 70 pivotally supported by a bracket 68 fixed to the moving body 34 runs on the rail 66. At the same time, the elastic force of the tension coil spring 74 stretched between the first spring hook 72 attached to the third stand 61 and the second spring hook 73 attached to the bracket 68 causes the moving body 34 to retort. The protrusion (sliding surface) 42 of the holding plate 30 is urged toward the entrance of the retort 2
It is adapted to be pressed against the sealing material 22 on the end face of the.

As described above, in the present embodiment, the moving body 34 and the holding plate 30 move as the retort 2 expands and contracts, and the projection 42 (sliding contact surface) of the holding plate 30 fits on the end surface of the retort 2. Since it is pressed against the attached sealing material 22, it is possible to prevent the leakage of gas in the retort 2 and the invasion of outside air into the retort 2. Further, the sealing materials 48 and 50 fixed to the holding plate 30 are attached to the retort 2. Since the outer cylinder 26 is rotatably fitted to the outer cylinder 26, even if the protrusion 42 and the seal material 22 are insufficiently sealed,
A reliable seal is provided between 6 and 6.

The inner surface of the outer cylinder 26 is cooled by the cooling water jetted from the nozzle 28, and the sealing material 48,
Since grease is filled between 50, seizure can be prevented, and sealing materials 48 and 50 having excellent sealing properties such as rubber can be used.

Further, since the holding plate 30 and the discharge tube 4 are connected by the flexible tube 64 having excellent heat resistance, the expansion and contraction of the retort 2 can be absorbed. In the heat-treated product, the valve 75 provided at the lower end of the retort 2 is opened at the same time as the valve 76 provided at the upper end is opened to inject a pressurized gas in accordance with the atmosphere in the retort 2 to change the atmosphere in the retort 2. The heat-treated product can be discharged without change.

Next, an embodiment in which the present invention is applied to the inlet side of a rotary kiln will be described with reference to FIG. In the introducing device 77, an exhaust pipe 79 having valves 78 for appropriately discharging the gas in the retort 2 at the top and bottom is airtightly connected to the holding plate 30 by the flexible tube 64, and the exhaust pipe 7 is provided.
A screw conveyor 80 that hermetically penetrates 9 is inserted into the inlet of the retort 2, and the unheated product is introduced into the retort 2 by the screw conveyor 80.

In addition, since the inlet side of the retort 2 has a lower temperature than the outlet side described above, it has the same structure as the outlet side described above except that the cooling nozzle 28 is not provided. And the description thereof will be omitted.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment in which the present invention is applied to the outlet side of a retort.

FIG. 2 is an enlarged cross-sectional view of a part of FIG.

FIG. 3 is a side view of the retort in a contracted state.

FIG. 4 is a side view of the retort in a stretched state.

FIG. 5 is a plan view of the retort in a contracted state.

FIG. 6 is a plan view of the retort in a stretched state.

FIG. 7 is a sectional view of an embodiment in which the present invention is applied to the inlet side of a retort.

[Explanation of symbols] 2: Retort 4: Ejection device 22: Seal material 26: Outer cylinder 28: Nozzle 30: Holding plate 34: Moving pair 40: Compression coil spring 42: Projection (sliding surface) 48, 50: Seal material 52, 54: ring 58: Grease nipple 64: Flexible tube 66: Rail 70: Roller 74: tension coil spring 77: Introduction device

Claims (4)

[Claims] 1. A spring mounted on the moving body, which is provided on a side of an outlet portion or an inlet portion of the retort projecting from the furnace body, the moving body moving parallel to the axial direction of the retort as the retort expands and contracts. A ring-shaped holding plate having a sliding contact surface that airtightly slides in contact with the end surface of the retort via a sealing material by the elastic force of Or, a sealing structure for an outlet portion or an inlet portion of an external heat type rotary kiln which is airtightly connected to the inlet side introduction device through a flexible tube. 2. A double pipe having a gap in the radial direction is formed at the end portion on the outlet side or the inlet side of the retort, and one or more elastic members held by a holding plate on the outer peripheral surface of the outer pipe of the double pipe. With a sealing material having a relative rotation freely fitted, the center hole of the holding plate, through the flexible tube to the outlet side discharge device, or via the flexible tube to the inlet side introduction device , Sealing structure at the outlet or inlet of an externally heated rotary kiln that is airtightly connected. 3. A sealant having the elasticity is formed in a gap in the axial direction of the retort, and a pair of two seal members is fitted in the gap and grease is injected into the gap. The seal structure of the outlet part or the inlet part of the external heat type rotary kiln according to claim 2. 4. The outlet part of the external heating type rotary kiln according to claim 2 or 3, wherein a cooling liquid or gas is blown between the inner pipe and the outer pipe of the double pipe. Seal structure at the entrance.