JPH0629637U - Horizontal mill trunnion seal structure - Google Patents

Abstract

(57) [Summary] [Purpose] Prevent the pulverized coal in the seal box from leaking to outside. A trunnion tube 7 supported so as not to rotate is inserted into a hollow trunnion 4 connected to an end portion of a rotatable inner tubular body portion in the direction of the axis l, and the trunnion tube 7 is inserted.
A seal box 12 having an opening 12a on the side facing the trunnion 4 is attached to the outer periphery of the, and a hollow cylindrical body 21b concentrically surrounding the trunnion tube 7 is provided at the end of the trunnion 4 on the seal box 12 side. The seal cylinder 21 is attached, and the seal cylinder 21 is attached to the opening 12a of the seal box 12.
A gasket holding cylinder 23 is attached concentrically with the hollow cylindrical body 21b whose inner circumference is a seal cylinder 21.
A garter spring 2 in which an annular gasket 24 capable of contacting the outer circumference is fitted and the inner circumference of the gasket 24 is pressed against the hollow cylindrical body 21b of the seal cylinder 21 on the outer circumference of the gasket 24.
Install 6b.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a trunnion seal structure for a horizontal mill having good sealing performance.

[0002]

[Prior art]

 A horizontal mill is a device for throwing cast iron balls and coal into a cylindrical body lined with a liner, impacting the coal with the cast iron balls by rotating the cylindrical body, and pulverizing to obtain pulverized coal. Is.

This horizontal mill will be described with reference to FIG. 3. At both ends of the rotatable cylindrical body 2 of the horizontal mill 1 in the direction of the axis l, the trunnion bearing 3 is fitted and a hollow portion 4 b is provided inside. The trunnion 4 having is connected integrally. In the hollow portion 4b of the trunnion 4, a trunnion tube containing a cylindrical tube 5 for sending heated air to the cylindrical body 2 and a screw conveyor 6 for coal supply arranged around the outer circumference of the cylindrical tube 5. The trunnion tube 7 is inserted through the trunnion tube 7, and a portion of the trunnion tube 7 protruding from the trunnion 4 to the outside is supported and fixed to a frame or the like so as not to rotate.

Since the trunnion tube 7 is inserted into the hollow portion 4b of the trunnion 4 as described above, a gap 8 is formed between the trunnion 4 and the trunnion tube 7 as shown in FIG. The inner space 2a shown in FIG. 3 of the body portion 2 communicates with the outside through the gap 8 and the pulverized coal may leak to the outside. Therefore, the outer end portion of the trunnion 4 with respect to the direction of the axis l may be leaked to the outside. 4a is provided with a trunnion seal structure 9 to prevent pulverized coal from leaking to the outside.

The trunnion seal structure 9 includes a seal ring 10 fixed to the outer end 4 a of the trunnion 4 in the direction of the axis 1 and rotatable with the trunnion 4, and a trunnion pipe on the outer circumference of the trunnion pipe 7. 7, a cylindrical lid-shaped seal box 12 which is mounted concentrically with 7 and communicates with an internal space 2a of the cylindrical body 2 through a gap 8 and which has an opening 12a on the side facing the seal ring 10. And a ring-shaped gasket formed of asbestos or the like, which is attached to the flange 13 fixed to the outer peripheral portion of the seal box 12 on the side of the opening 12a and can contact the outer end of the seal ring 10 in the axial direction 1 of the trunnion tube 7. 14 and a ring-shaped backing metal 15 that can press the ring-shaped gasket 14 against the end surface of the seal ring 10 and is made of an elastic material. And a ring-shaped holding plate 16 that holds the gasket 14.

In the figure, 17 is an outlet for pulverized coal and primary air, 18 is a coarse powder separator, 19 is a baffle plate, and 20 is an oil retainer attached to the lower side of the trunnion bearing 3.

In the horizontal mill 1, the coal is sent by the screw conveyor 6 to the rotating cylindrical body 2, and the coal is crushed in the cylindrical body 2 in cooperation with the cast iron balls. The coal pulverized into the required fine powder is carried to the coarse powder separator 18 through the gap between the trunnion pipe 7 and the cylindrical pipe 5 by the heated air blown from the cylindrical pipe 5 into the cylindrical body 2.

During operation of the horizontal mill 1, the seal ring 10 rotates together with the cylindrical body 2 and the trunnion 4, but the trunnion tube 7, the seal box 12, and the gasket 14 do not rotate, and the seal ring 10 does not rotate. Slide against.

On the other hand, a part of the heated air introduced into the cylindrical body 2 enters the inside 11 of the seal box 12 through the gap 8 together with the pulverized coal, but the gasket 14 is introduced into the opening 12 a of the seal box 12. Is provided and the gasket 14 is pressed against the seal ring 10 by the backing metal 15 with a constant force, so that the heated air containing the pulverized coal does not flow out.

When the horizontal mill 1 is operated, heated air is introduced into the cylindrical body 2, so that the cylindrical body 2 and the trunnion 4 are thermally expanded and moved to the seal box 12 side. Therefore, the bending of the backing metal 15 becomes large, and the pressing force of the seal ring 10 against the gasket 14 becomes larger than that before the thermal expansion of the cylindrical body 2 and the trunnion 4.

[0011]

[Problems to be solved by the device]

 In the trunnion seal structure 9 described above, the seal ring 10 slides on the gasket 14 to cause wear on the gasket 14, and the pulverized coal from the inside 11 of the seal box 12 passes through the worn part of the gasket 14. And leaks to the outside, and the pulverized coal that has leaked enters the inside of the oil retainer 20 that supplies oil to the trunnion bearing 3, so that the trunnion bearing 3 may be damaged.

The present invention has been made in view of the above circumstances, and an object thereof is to prevent the pulverized coal in the seal box from leaking to the outside from the sliding portion.

[0013]

[Means for Solving the Problems]

 According to the present invention, a trunnion tube supported so as not to rotate is inserted into a hollow portion of a trunnion connected to an axial end portion of a rotatable cylindrical body, and the trunnion tube protrudes axially outward from the trunnion. Attach a seal box that encloses the outer circumference of the trunnion pipe and has an opening on the side facing the trunnion, and a hollow that concentrically surrounds the trunnion pipe at the end of the trunnion facing the seal box. A seal tube having a tubular body is attached, and a gasket holding tube having a hollow tubular body that concentrically surrounds the hollow tubular body of the seal tube is attached to the opening of the seal box. The elastic body is attached to the cylindrical body so that the inner periphery can contact the outer periphery of the hollow cylindrical body of the seal cylinder and the inner periphery is pressed against the outer periphery of the hollow cylindrical body of the seal cylinder. Those formed by fitting the inner and Jo gasket.

[0014]

[Action]

 During operation, the trunnion also rotates due to the rotation of the cylindrical moving part, and the hollow cylindrical body of the seal cylinder slides in the circumferential direction against the gasket and the thermal expansion and contraction of the cylindrical body and trunnion. Also slides in the axial direction.

However, since the inner circumference of the gasket is always pressed against the outer circumference of the hollow cylindrical body of the seal cylinder by the elastic member, a gap is generated between the inner circumference of the gasket and the outer circumference of the hollow cylindrical body of the seal cylinder. And the sealing performance is maintained satisfactorily.

[0016]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 and 2 show an embodiment of the present invention, in which the same components as those shown in FIG. 4 are designated by the same reference numerals.

In the figure, reference numeral 21 is a seal cylinder provided with an annular flange 21a and a hollow cylindrical body 21b fixed to the outer periphery of the annular flange 21a. The seal cylinder 21 is arranged near the outer end 4a of the trunnion 4 so that the hollow cylindrical body 21b and the annular flange 21a surround the trunnion pipe 7 in a substantially concentric manner. It is attached to the trunnion 4 by bolting to the outer end 4a of the.

An annular flange 22 is bolted to the flange 13 attached to the opening 12 a side of the seal box 12 so as to be substantially concentric with the outer periphery of the trunnion pipe 7, and the outer side of the annular flange 22 with respect to the trunnion 4 is tightened. A gasket holding cylinder 23 is arranged on the side facing the end 4a.

The gasket holding cylinder 23 includes a hollow tubular body 23a, an annular flange 23b attached to the outer periphery of one end of the hollow tubular body 23a, and an annular flange 23c attached to the inner periphery of the other end of the hollow tubular body 23a. ing. Thus, the hollow cylindrical body 23a and the annular flange 23c are arranged such that the annular cylinder 23b faces the flange 13 of the seal box 12 and the annular flange 23c faces the outer end 4a of the trunnion 4. The gasket holding cylinder 23 is attached to the annular flange 22 by bolting the annular flange 23b to the annular flange 22 so as to surround the hollow cylindrical body 21b.

In the hollow cylindrical body 23 a of the gasket holding cylinder 23, asbestos is formed so that one end surface thereof contacts the outer surface of the annular flange 22 and the inner peripheral surface thereof contacts the outer periphery of the hollow cylindrical body 21 b of the seal cylinder 21. And the like, and the outer peripheral surface of the hollow cylindrical body 23a contacts the inner peripheral surface of the hollow cylindrical body 23a, and both side surfaces contact the side surface of the gasket 24 and the inner surface of the annular flange 23c. 25 is fitted, and the annular fixture 25 is bolted to the annular flange 23c.

The gasket 24 has a substantially L-shaped gasket body 26 that is generally annular and has a partially cut-away cross-sectional shape, and a generally annular shape that is internally fitted to the notched portion of the gasket body 26. The gasket main body 27 has a substantially rectangular shape.

The gasket body 26 is provided with a plurality of gasket segments 26a divided in the circumferential direction at required intervals and a coil-shaped garter spring 26b wound around the outer periphery, and the gasket body 27 is a circle. It is provided with a plurality of gasket segments 27a divided in the circumferential direction at required intervals. Thus, the gasket segments 26a and 27a are arranged such that the dividing surface 26c of the gasket segment 26a and the dividing surface 27b of the gasket segment 27a are displaced in the circumferential direction.

During operation of the horizontal mill, the seal cylinder 21 rotates together with the cylindrical body 2 (see FIG. 3) and the trunnion 4, but the trunnion tube 7, the seal box 12, the gasket holding cylinder 23, and the gasket 24. Does not rotate, and the outer circumference of the hollow cylindrical body 21b of the seal cylinder 21 slides in the circumferential direction with respect to the inner circumference of the gasket 24.

Further, since heated air is introduced into the cylindrical body 2, the cylindrical body 2 and the trunnion 4 thermally expand and move to the seal box 12 side, and when the operation is stopped, the heated air is introduced. Since the cylindrical body 2 and the trunnion 4 are thermally contracted, the cylindrical body 2 and the trunnion 4 move away from the seal box 12. Therefore, the hollow cylindrical body 21b of the seal cylinder 21 slides on the gasket 24 in the direction of the axis l.

However, since the inner circumference of the gasket 24 is constantly pressed against the outer circumference of the hollow tubular body 21b of the seal tube 21 by the garter spring 26b, the hollow tubular body 21b of the seal tube 21 is directed toward the gasket 24 in the cylindrical direction or Even if the inner circumference of the gasket 24 slides in the direction of the axis l and the inner circumference of the gasket 24 rubs, no gap is created between the inner circumference of the gasket 24 and the outer circumference of the hollow cylindrical body 21b of the seal cylinder 21, and good sealing performance is maintained. To be done.

Further, since the sealing performance is maintained well, the pulverized coal does not flow out from the seal box 12, and further the pulverized coal does not enter the oil retainer 20, and the trunnion bearing 3 burns out. Nothing.

The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0029]

[Effect of device]

 According to the trunnion seal structure of the horizontal mill of the present invention, since the seal box can be satisfactorily sealed, the pulverized coal in the seal box is prevented from leaking out from the sliding portion between the seal cylinder and the gasket. It can be surely prevented.

[Brief description of drawings]

FIG. 1 is a sectional view of a trunnion seal structure of a horizontal mill according to the present invention.

FIG. 2 is a partial front view of a gasket used in the trunnion seal structure of the horizontal mill of the present invention.

FIG. 3 is a front view of a horizontal mill showing a sectional view below the center line.

FIG. 4 is a cross-sectional view of a trunnion seal structure of a conventional horizontal mill.

[Explanation of symbols]

 1 Horizontal Mill 2 Cylindrical Body 4 Trunnion 4a Outer End 4b Hollow 7 Trunnion Tube 9 Trunnion Seal Structure 12 Seal Box 12a Opening 21 Seal Tube 21b Hollow Cylindrical Body 23 Gasket Holding Tube 24 Gasket 26b Garter Spring (Elastic Member) )

Claims (1)

[Scope of utility model registration request] 1. A trunnion tube supported so as not to rotate is inserted into a hollow portion of a trunnion connected to an axial end portion of a rotatable cylindrical body, and the trunnion tube axially outwardly projects from the trunnion of the trunnion tube. A hollow cylinder that encloses the outer periphery of the trunnion tube and has a seal box having an opening on the side facing the trunnion, and concentrically surrounds the trunnion tube at the end of the trunnion on the side facing the seal box. A sealing cylinder having a cylindrical body, and a gasket holding cylinder having a hollow cylindrical body concentrically surrounding the hollow cylindrical body of the sealing cylinder is attached to the opening of the seal box. An annular shape in which an elastic member is attached to the body so that the inner circumference can contact the outer circumference of the hollow cylindrical body of the seal cylinder and the inner circumference is pressed to the outer circumference of the hollow cylindrical body of the seal cylinder. Trunnion seal structure for horizontal mills, which is characterized by being internally fitted with the above gasket.