CN224093830U - A ball mill feed end face sealing device - Google Patents

Abstract

This utility model discloses a sealing device for the feed end face of a ball mill, including a ring plate. The ring plate is welded and fixed to the outer edge of the end face of the feed screw cylinder, and a continuous annular sealing support surface is formed on its inner side. A sealing ring is fitted on the outer circumferential surface of the feed screw cylinder. The sealing ring and the sealing support surface of the ring plate are coaxial. A sealing gasket is fitted to the outer side of the sealing ring. The outer diameter of the sealing gasket is clearance-fitted with the inner diameter of the ring plate to form a radial sealing surface. Springs are evenly distributed along the circumference of the ring plate. One end of the spring abuts against the back of the sealing gasket, and the other end is fixed in the inner groove of the ring plate. The sealing gasket and the sealing ring are pressed together by a pre-tightening force. This utility model uses the springs to evenly press the sealing ring and the sealing gasket together, and the elastic pre-tightening force adapts to dynamic deformation to ensure that the sealing surfaces are always tightly fitted. Combined with the design of the trapezoidal cross-section sealing ring and the composite wear-resistant rubber sealing gasket, the wear resistance and impact resistance are improved, and the service life is extended.

Description

Ball mill feeding end face sealing device

Technical Field

The utility model belongs to the technical field of ball mill feeding, and particularly relates to a sealing device for a feeding end face of a ball mill.

Background

Ball mills are key devices for crushing after the material has been crushed. The grinding operation is an important link in cement production, both raw materials and cement are obtained through grinding, and if the fuel is coal, coal dust is also required to be ground into the kiln for combustion. The grinding technology directly affects the quality and technical and economic indexes of cement production.

The traditional ball mill feed end generally adopts coarse wool felt seal structure, and its material wearability is poor, receives the material to strike and rub the back and easily damage for a long time, leads to sealed inefficacy, leaks the material seriously, not only causes dust pollution and raw materials extravagant, still need shut down because of frequently changing the felt and dismantle feed arrangement, and maintenance cycle is long and with high costs. In addition, traditional seal can't adapt to the dynamic deformation when ball mill rotates, further aggravates the problem of leaking the material after sealed face clearance increases, and seal assembly lacks rigid support simultaneously, easily takes place the displacement because of vibration or impact, leads to appearing the problem that sealing reliability reduces.

Disclosure of utility model

The utility model aims to overcome the existing defects and provide a sealing device for the feeding end face of a ball mill, so as to solve the problems in the background art.

In order to achieve the purpose, the technical scheme is that the feeding end face sealing device of the ball mill comprises a ring plate, wherein the ring plate is fixedly welded to the outer edge of the end face of a feeding spiral cylinder, a continuous annular sealing supporting face is formed on the inner side of the ring plate, a sealing ring is sleeved on the outer circumferential surface of the feeding spiral cylinder, the sealing ring is coaxial with the sealing supporting face of the ring plate, a sealing gasket is arranged on the outer side of the sealing ring in a fit mode, the outer diameter of the sealing gasket is in clearance fit with the inner diameter of the ring plate to form a radial sealing face, springs are uniformly distributed along the circumferential direction of the ring plate, one end of each spring is abutted to the back face of the sealing gasket, the other end of each spring is fixedly arranged in an inner side groove of the ring plate, the sealing gasket and the sealing ring are tightly pressed through pretightening force, a pressing plate is fixedly arranged on the end face of the feeding spiral cylinder through bolts, and the pressing plate covers the sealing ring, the sealing gasket and the outer side of each spring, and the axial displacement of each pressing plate is limited.

Preferably, the annular plate sealing support surface is welded with the end face of the feeding spiral cylinder vertically, a continuous welding seam is arranged at the welding position of the annular plate sealing support surface, and an annular groove is formed in the inner side of the annular plate and used for accommodating the end part of the spring.

Preferably, the cross section of the sealing ring is of a trapezoid structure, the inclined surface of the sealing ring is attached to the corresponding inclined surface of the sealing gasket to form self-tightening sealing, and the inner wall of the sealing ring is provided with an anti-slip protrusion in interference fit with the outer circumferential surface of the feeding pipe.

Preferably, the sealing gasket is made of composite wear-resistant rubber, a polytetrafluoroethylene layer is coated on the outer surface of the sealing gasket, and a wavy groove is formed in the contact surface of the sealing gasket and the annular plate.

Preferably, the springs are a plurality of groups of spiral compression springs, each group of springs are uniformly distributed along the circumferential direction of the annular plate at intervals, the pretightening force of the springs is dynamically adjusted through an adjusting bolt, and the adjusting bolt penetrates through the annular plate and is connected with the fixed end of the springs.

Preferably, the pressing plate is of a split annular structure and is formed by splicing at least two arc plates through bolts, a guide boss is arranged at the inner edge of the pressing plate and is embedded with the outer groove of the sealing gasket, so that the sealing gasket is prevented from deflecting circumferentially.

Preferably, a guide ring is further arranged between the annular plate and the sealing gasket, the guide ring is fixed on the inner side of the annular plate, an axial guide groove is formed in the surface of the guide ring, a matched guide protrusion is arranged on the back surface of the sealing gasket, and the sealing gasket is limited to move only along the axial direction.

Compared with the prior art, the utility model provides a sealing device for the feeding end face of a ball mill, which has the following beneficial effects:

1. According to the utility model, the sealing ring and the sealing gasket are uniformly compressed by the spring, the sealing surface is ensured to be tightly attached all the time by utilizing the self-adaptive dynamic deformation of the elastic pretightening force, and the design of the trapezoid cross-section sealing ring and the composite wear-resistant rubber sealing gasket is combined, so that the wear resistance and the impact resistance are improved, and the service life is prolonged;

2. The sealing assembly is fixed into the detachable module group through the pressing plate, and can be quickly replaced without disassembling the feeding spiral cylinder by matching with the design of the split pressing plate and the locating pin, so that the maintenance cost and the downtime are obviously reduced. The annular plate is welded on the end face of the feeding spiral cylinder to form a continuous sealing supporting surface, the sealing gasket is limited to move only along the axial direction by combining the guide ring and the guide groove structure, circumferential offset is avoided, stability is enhanced, and the dust cover and the labyrinth sealing structure are additionally arranged to effectively prevent external dust from entering, so that abrasion risk is further reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate and together with the embodiments of the utility model and do not constitute a limitation to the utility model, and in which:

FIG. 1 is a schematic view of a sealing device for a feeding end face according to the present utility model;

FIG. 2 is a front view of a feed end face seal assembly according to the present utility model;

FIG. 3 is a schematic diagram of a seal ring according to the present utility model;

In the figure, 1, a sealing ring, 2, a sealing gasket, 3, a spring, 4, a ring plate, 5 and a pressing plate.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to figures 1-3, the utility model provides a technical scheme that a ball mill feeding end face sealing device comprises a ring plate 4, wherein the ring plate 4 is welded and fixed on the outer edge of the end face of a feeding spiral cylinder, a continuous annular sealing supporting surface is formed on the inner side of the ring plate, a sealing ring 1 is sleeved on the outer circumferential surface of the feeding spiral cylinder, the sealing ring 1 is coaxial with the sealing supporting surface of the ring plate 4, a sealing gasket 2 is attached to the outer side of the sealing ring 1, the outer diameter of the sealing gasket 2 is in clearance fit with the inner diameter of the ring plate 4 to form a radial sealing surface, springs 3 are uniformly distributed along the circumferential direction of the ring plate 4, one end of each spring 3 is abutted against the back face of the sealing gasket 2, the other end of each spring is fixed in an inner side groove of the ring plate 4, the sealing gasket 2 and the sealing ring 1 are pressed through a pretightening force, a pressing plate 5 is fixedly arranged on the end face of the feeding spiral cylinder through bolts, and the pressing plate 5 covers the outer sides of the sealing ring 1, the sealing gasket 2 and the springs 3, and axial displacement of the ball mill feeding spiral cylinder is limited.

In the utility model, preferably, a sealing support surface of a ring plate 4 is vertically welded with the end surface of a feeding spiral cylinder, a continuous welding seam is arranged at the welding position, an annular groove is formed in the inner side of the ring plate 4 and used for accommodating the end part of a spring 3, the section of a sealing ring 1 is of a trapezoid structure, the inclined surface of the sealing ring is attached to the corresponding inclined surface of a sealing gasket 2 to form a self-tightening sealing, an anti-slip bulge is arranged on the inner wall of the sealing ring 1 and is in interference fit with the outer circumferential surface of a feeding pipe, the sealing gasket 2 is made of composite wear-resistant rubber, a polytetrafluoroethylene layer is coated on the outer surface of the sealing gasket 2, wavy grooves are formed in the contact surface of the sealing gasket 2 and the ring plate 4, the springs 3 are multiple groups of spiral compression springs, each group of springs 3 are uniformly distributed at intervals of 30 degrees along the circumferential direction of the ring plate 4, the pre-tightening force of the springs 3 is dynamically adjusted through an adjusting bolt, the adjusting bolt penetrates through the ring plate 4 and is connected with the fixed end of the springs 3, the pressing plate 5 is of a split type annular structure, at least two arc plates are spliced through bolts, a guide boss is arranged on the inner edge of the sealing gasket 2, the sealing gasket 2 is embedded with the outer groove of the sealing gasket 2 to prevent circumferential deflection of the sealing gasket 2, a guide ring 4 is further arranged between the sealing gasket 4 and the sealing gasket is made of composite wear-resistant, the sealing gasket is at the inner side, the sealing gasket is at least one side, and the sealing gasket is evenly fixed, and is at least axially, and the sealing is fixed along the sealing gasket is axially along the sealing gasket guide along only has a sealing groove.

The working principle and the use flow of the feeding spiral tube are that when the feeding spiral tube is used, firstly, the annular plate 4 is welded and fixed on the outer edge of the end face of the feeding spiral tube to ensure that the inner side of the feeding spiral tube forms a continuous annular sealing supporting surface, then the sealing ring 1 is sleeved on the outer circumferential surface of the feeding tube and is in interference fit with the feeding tube through the anti-slip protrusions on the inner wall, then the sealing gasket 2 is attached to the outer side of the sealing ring 1 to enable the outer diameter of the sealing gasket to be in clearance fit with the inner diameter of the annular plate 4 to form a radial sealing surface, a plurality of groups of spiral compression springs 3 are uniformly distributed along the circumferential direction of the annular plate 4, one end of each spring 3 is abutted against the back face of the sealing gasket 2, the other end of each spring 3 is fixed in a groove on the inner side of the annular plate 4, the pretightening force of each spring 3 is adjusted through an adjusting bolt, finally, the split pressing plate 5 is spliced and fixed on the end face of the feeding spiral tube through bolts, the inner edge guiding boss of the pressing plate 5 is embedded in the groove on the outer side of the sealing gasket 2 to limit circumferential offset and cover the sealing ring 1, the sealing gasket 2 and the outer side of each spring 3, the elastic pressing force of each sealing gasket 2 is in clearance fit with dynamic deformation, when the device is in operation, the elastic pressing force of each sealing gasket is guaranteed, tight fitting, and the sealing is can be fast replaced without disassembling the sealing gasket and the sealing gasket 3.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. The utility model provides a ball mill feeding terminal surface sealing device, includes annular plate (4), its characterized in that, annular plate (4) welded fastening is in the terminal surface outer fringe of feeding screw, and inboard formation continuous annular seal supporting surface, feeding screw outer circumference surface cover is equipped with sealing washer (1), sealing washer (1) keep coaxial with the sealing supporting surface of annular plate (4), the outside laminating of sealing washer (1) is provided with sealing washer (2), sealing washer (2) external diameter and the internal diameter clearance fit of annular plate (4) form radial seal face, are provided with spring (3) along the circumference evenly distributed of annular plate (4), spring (3) one end butt is in the back of sealing washer (2), and in the inboard recess of annular plate (4) is fixed to the other end, compresses tightly sealing washer (2) and sealing washer (1) through the pretightning force, and feeding screw terminal surface is provided with clamp plate (5) through the bolt fastening, and clamp plate (5) cover in sealing washer (2) and the outside of spring (3), restriction its axial displacement.

2. The ball mill feeding end face sealing device according to claim 1, wherein the sealing support surface of the annular plate (4) is perpendicularly welded with the feeding spiral tube end face, a continuous welding seam is arranged at the welding position, and an annular groove is formed in the inner side of the annular plate (4) and used for accommodating the end portion of the spring (3).

3. The sealing device for the feeding end face of the ball mill, which is disclosed in claim 1, is characterized in that the section of the sealing ring (1) is of a trapezoid structure, the inclined surface of the sealing ring is attached to the corresponding inclined surface of the sealing pad (2) to form self-tightening sealing, and anti-slip protrusions are arranged on the inner wall of the sealing ring (1) and are in interference fit with the outer circumferential surface of the feeding pipe.

4. The sealing device for the feeding end face of the ball mill according to claim 1, wherein the sealing pad (2) is made of composite wear-resistant rubber, the outer surface of the sealing pad is coated with a polytetrafluoroethylene layer, and the contact surface of the sealing pad (2) and the annular plate (4) is provided with wavy grooves.

5. The ball mill feeding end face sealing device according to claim 1, wherein the springs (3) are a plurality of groups of spiral compression springs, each group of springs (3) are uniformly distributed along the circumferential direction of the annular plate (4) at intervals of 30 degrees, the pretightening force of the springs (3) is dynamically adjusted through an adjusting bolt, and the adjusting bolt penetrates through the annular plate (4) and is connected with the fixed end of the springs (3).

6. The sealing device for the feeding end face of the ball mill according to claim 1, wherein the pressing plate (5) is of a split type annular structure and is formed by splicing at least two arc plates through bolts, a guide boss is arranged at the inner edge of the pressing plate and is embedded with an outer groove of the sealing gasket (2), and the sealing gasket (2) is prevented from being deflected in the circumferential direction.

7. The ball mill feeding end face sealing device according to claim 1, wherein a guide ring is further arranged between the annular plate (4) and the sealing gasket (2), the guide ring is fixed on the inner side of the annular plate (4), an axial guide groove is formed in the surface of the guide ring, a matched guide protrusion is arranged on the back surface of the sealing gasket (2), and the sealing gasket (2) is limited to move only in the axial direction.