CN102489375B - Mill feeding multi-seal system - Google Patents

Abstract

The invention discloses a mill feeding multiple sealing system, which comprises a feed bushing connected to a feed end cover, the large end of the inner chamber of the feed bush is a tapered surface, and the small end of the feed bush The end face and the feed pipe extending into the inner cavity of the feed bushing are connected by an adjustable gland, and the adjustable gland, between the feed bush and the feed pipe, and between the adjustable gland and the feed pipe A total of two seals are provided; the inner cavity of the feed bushing is provided with at least one groove and a step matched with the discharge end of the feed pipe, and the steps and grooves form a labyrinth with the discharge end of the feed pipe seal. The adjustable gland of the present invention can be adjusted online, and the asbestos filler can be continuously pressed to ensure the sealing performance of the feed without stopping the mill; the tapered surface and labyrinth seal before the asbestos filler is sealed greatly reduce the wear and tear on the asbestos filler , and added a sealing ring at the end to seal, the sealing performance is good, the life of the seal at the feed end is improved, the number of mill shutdowns is significantly reduced, and the production efficiency is improved.

Description

A Mill Feed Multiple Sealing System

technical field

The invention relates to a sealing system, in particular to a mill feed multiple sealing system.

Background technique

At the feed end of the mill, due to the large particle size of the material, the wear of the seal at the feed end is accelerated. At present, the fixed gland type seal, the elastic seal ring filled in the labyrinth seal ring, and various forms of feed seals are commonly used. The feeding end of the pipe is equipped with a structure of multiple sealing rings. The above structure is not only complicated in structure, but also sealed with sealing materials. With the continuous operation of the mill, the sealing materials will continue to wear and tear, and the gland cannot Adjusting the compaction amount online will lead to gradual failure of the sealing performance. The sealing life depends on the wear resistance of the sealing material, and the service life is not long, resulting in air leakage, powder leakage, and slurry leakage at the feed end of the mill. Frequent replacement of sealing materials is serious. Affect the production efficiency of the mill.

Contents of the invention

In order to make up for the deficiencies of the prior art, the present invention provides a multiple sealing system for mill feeding, which uses a mechanical structure from the source to prevent most of the materials from wearing the sealing packing, and this performance is not affected by the length of mill running time Therefore, the wear of the sealing material by the grinding material is greatly reduced, the life of the seal is prolonged, and the replacement cycle is significantly shortened.

To achieve the above object, the present invention is achieved through the following technical solutions:

A mill feeding multiple sealing system, which includes a feed bushing, the feed bush is connected to a feed end cover, the large end of the inner cavity of the feed bush is a tapered surface, and the small end surface of the feed bush is It is connected with the feed pipe extending into the inner cavity of the feed bushing through an adjustable gland, and the adjustable gland, the feed bush and the feed pipe, and the adjustable gland and the feed pipe are in common There are double seals; the inner cavity of the feed bushing is provided with at least one groove and a step matched with the discharge end of the feed pipe, and the step and groove form a labyrinth seal with the discharge end of the feed pipe .

A hole for the feed pipe to enter is provided on the small end surface of the feed bushing, and a V-shaped groove is provided on the outer edge of the hole.

The adjustable gland is connected to the outer side of the small end face of the feed bush through adjusting bolts, and the adjustable gland is provided with a slope matching the V-shaped groove on the feed bush, and an inner hole for the feed pipe to pass through. The hole is provided with at least one rectangular annular groove on the inner wall of the inner hole.

The gap between the inner hole of the adjustable gland and the feed pipe is not greater than 5mm.

The adjustable gland is press-fitted with the feed bushing as clearance fit.

The double seal includes the V-shaped groove of the feed bush, the asbestos packing seal between the inclined surface on the adjustable gland and the feed pipe, and the seal between the rectangular annular groove of the adjustable gland and the feed pipe. ring seal.

The gap between the step of the feed bushing and the end face of the feed pipe, and the gap between the outer circle of the feed pipe and the parallel section of the inner chamber of the feed bush is not greater than 10 mm.

The multiple seals of the present invention form a labyrinth seal by the grooves and steps in the inner chamber of the feed bushing and the discharge end of the feed pipe, and the adjustable gland and the asbestos packing seal between the feed bush and the feed pipe can be adjusted. The sealing ring between the gland and the feed pipe is sealed and the adjustable gland is connected with the feed bushing through an adjusting bolt and the compression amount can be adjusted online. The feed bushing has an optimized structure, the large end of the inner cavity is a tapered surface, the inner cavity includes a step and at least one groove, and forms a labyrinth seal with the feed pipe. The gap between the end face and the outer circle formed between the step of the feed bushing and the feed pipe is not greater than 10 mm. The asbestos packing seal can be continuously adjusted online, and the bolt can be pushed to push the adjustable gland to compress the asbestos packing to ensure the seal, and the adjustment amount is greater than 5mm. The press fit between the adjustable gland and the feed bushing is a clearance fit; the press-fit end of the adjustable gland is provided with an inclined surface, and at least one annular groove with a rectangular cross-section is provided in the inner hole, and the inclined surface compresses the asbestos filler, and the rectangular groove presses The inlet seal ring constitutes the seal of the seal ring; the gap between the inner hole of the adjustable gland and the feed pipe is not more than 5mm.

Beneficial effects of the present invention: the present invention adopts the online adjustment of the adjustable gland, which can continuously compress the asbestos filler to ensure the sealing performance of the feed without stopping the mill; in the present invention, the large end of the inner cavity of the feed bush is a cone The labyrinth seal formed between the shaped structure and the feed bushing and feed pipe greatly reduces the wear of the asbestos packing seal and the sealing ring seal by the grinding material. The asbestos packing seal adopts an adjustable gland to continuously adjust the pressure online during operation. Tight quantity, coupled with the sealing ring, the sealing performance is good, and the seal replacement cycle is obviously longer, which greatly improves the service life of the feed end seal, so that the number of shutdowns of the mill due to poor feed seal is significantly reduced, and the mill is improved. production efficiency.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a feed pipe sectional view of the present invention;

Fig. 3 is an enlarged view of I among Fig. 1 of the present invention;

Fig. 4 is a sectional view of the feed liner of the present invention;

Fig. 5 is a sectional view of the adjustable gland of the present invention;

Among them, 1. Feed end cover, 2. Feed bushing, 3. Asbestos filler, 4. Seal ring, 5. Adjustable gland, 6. Bolt, 7. Washer, 8. Feed pipe, 9. Clearance Fitting, 10. Tapered surface, 11. Step, 12. Groove, 13. V-shaped groove, 14. Rectangular annular groove, 15. Inclined surface.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing.

As shown in Figures 1 to 5, a mill feeding multiple sealing system includes a feed bushing 2, the feed bush 2 is connected to the feed end cover 1 through bolts, and the inner cavity of the feed bush 2 The big end is a tapered surface 10, the step 11 and groove 12 of the inner cavity of the feed bush 2 form a labyrinth seal with the end surface and the outer circular surface of the discharge end of the feed pipe 8, and the V-shaped groove 13 at the outer end of the feed bush 2 Fill in the asbestos filler 3, press the inclined surface 15 on the end face through the adjustable gland 5 to compress the asbestos filler 3, and push the adjustable gland 5 by tightening the bolt 6 and the washer 7 to continuously compress the asbestos filler 3 online. A rectangular annular groove 14 is provided in the inner hole of the pressure regulating cover 5, and the sealing ring 4 is pressed in to form a sealing ring seal.

As shown in Figure 1, Figure 2 and Figure 3, Figure 4, the gap between the end surface and the circumference of the step 11 of the feed bushing 2 and the discharge end of the processed feed pipe 8 is not greater than 10 mm; the adjustable gland 5 can be adjusted If it is greater than 5mm, the fit between the press-in end and the feed bushing 2 is clearance fit 9; the gap between the inner hole of the adjustable gland 5 and the feed pipe 8 is not greater than 5mm.

Claims (5)

1. A mill feed multiple sealing system, which includes a feed bushing, the feed bush is connected to the feed end cover, the large end of the feed bush inner cavity is a tapered surface, and the feed bush The small end surface is connected with the feed pipe extending into the inner cavity of the feed bushing through an adjustable gland, and the feature is that the adjustable gland, the gap between the feed bush and the feed pipe, and the adjustable gland There are two seals between the feed pipe and the feed bush; at least one groove and a step matched with the discharge end of the feed pipe are provided in the inner cavity of the feed bush, and the step and the groove are connected with the feed pipe. The discharge end of the tube forms a labyrinth seal; The press fit between the adjustable gland and the feed bushing is clearance fit; The gap between the step of the feed bushing and the end face of the feed pipe, and the gap between the outer circle of the feed pipe and the parallel section of the inner chamber of the feed bush is not greater than 10 mm. 2. The system according to claim 1, wherein a hole for the feed pipe to enter is provided on the small end surface of the feed bushing, and a V-shaped groove is provided on the outer edge of the hole. 3. The system according to claim 2, wherein the adjustable gland is connected to the outer side of the small end face of the feed bush through an adjustment bolt, and the adjustable gland is provided with a V-shaped The groove matches the slope, and the inner hole for the feed pipe to pass through, and at least one rectangular annular groove is arranged on the inner wall of the inner hole. 4. The system according to claim 3, wherein the gap between the inner hole of the adjustable gland and the feed pipe is not greater than 5 mm. 5. The system according to claim 4, characterized in that, the double seal comprises a V-shaped groove of the feed bushing, an asbestos filler seal between the inclined surface on the adjustable gland and the feed pipe, and A sealing ring is used for sealing between the rectangular annular groove of the pressure regulating cover and the feeding pipe.