阅读说明：本技术 一种用于密度纤维板生产设备盘磨机主轴的密封装置 (Sealing device for main shaft of disc mill of density fiberboard production equipment ) 是由 方莹 李欢 陈玉婷 宋蓉蓉 于 2019-09-29 设计创作，主要内容包括：本发明用于密度纤维板生产设备盘磨机主轴的密封装置,驱动主轴上的轴套外部通过密封座同时配合安装油封室、冲洗圈、嵌入件、密封环,油封室内安装盘根,冲洗圈通过进气孔连接压缩气源,密封环前端插入至动磨盘背面的限位槽内,通过多组密封圈密封盘磨机磨浆区域的浆料和蒸汽,防止密封介质泄漏,系统运行过程中经进气孔通入压缩空气,减少运行过程中密封介质的泄漏和磨浆过程中的浆料对轴套及油封室内密封圈组的损坏,能够防止密封介质泄漏,减少对密封组件与主轴磨损,密封效果好,性能可靠,结构简单,操作方便,维修工作量少,成本低廉。(the invention relates to a sealing device for a main shaft of a disc mill of density fiberboard production equipment, wherein an oil seal chamber, a flushing ring, an embedded part and a sealing ring are arranged outside a shaft sleeve on a driving main shaft in a matched mode through a sealing seat, a packing is arranged in the oil seal chamber, the flushing ring is connected with a compressed air source through an air inlet, the front end of the sealing ring is inserted into a limiting groove on the back face of a movable grinding disc, and the sealing disc mill is used for sealing pulp and steam in a pulp grinding area through a plurality of groups of sealing rings to prevent sealing medium leakage.)

1. The utility model provides a sealing device for density fiberboard production facility disc mill main shaft, including the drive main shaft, the cooperation of drive main shaft front end is stretched into to the mill of disc mill room body cavity inside to fixedly connected with moves mill, its characterized in that: the driving main shaft is sleeved with a shaft sleeve, a sealing assembly is arranged outside the shaft sleeve and comprises a sealing seat, an oil seal chamber is arranged on the inner side of the sealing seat, and a plurality of groups of special-shaped sealing rings are arranged between the inner cavity of the oil seal chamber and the shaft sleeve;

A flushing ring is arranged at the position, located on the front side of the oil seal chamber, of the space between the seal seat and the shaft sleeve, the front end of the flushing ring is fixedly connected to the front end face of a limiting step hole in the inner cavity of the seal seat through a bolt, and the rear end of the flushing ring is limited and tightly pressed on the oil seal chamber and the special-shaped seal ring;

the sealing seat is fixedly connected with a flange on a mounting hole of the grinding chamber body cavity through an inner side flange;

The flushing ring and the sealing seat are provided with communicated air inlets which are communicated with an external compressed air source, so that positive pressure can be generated between the flushing ring and the shaft sleeve, and the material in the cavity of the grinding chamber body is prevented from leaking from a gap;

An oil inlet hole is formed in the sealing seat, and the oil seal chamber is communicated with the oil inlet hole in the sealing seat;

the rear end of the sealing seat is provided with a sealing cover plate which is fixedly connected to the rear end surface of the sealing seat through a bolt;

the rear end of the shaft sleeve is fixedly connected to the driving main shaft through a first torque transmission bolt.

2. the sealing device for the main shaft of the disc grinder of the density fiberboard production equipment according to claim 1, wherein: at least two first O-shaped sealing rings are arranged between the inner wall of the shaft sleeve and the outer surface of the driving main shaft.

3. the sealing device for the main shaft of the disc grinder of the high-density fiberboard production equipment according to claim 1, wherein: and the outer side of the oil seal chamber is sealed with the seal seat through a plurality of groups of second O-shaped seal rings.

4. The sealing device for the main shaft of the disc grinder of the density fiberboard production equipment according to claim 1, wherein: and an air inlet ring groove is also arranged on the flushing ring and is communicated with the air inlet.

5. The sealing device for the main shaft of the disc grinder of the density fiberboard production equipment according to claim 1, wherein: the end part of the inner side of the flushing ring is provided with an annular embedded part made of a non-metal wear-resistant material, the embedded part is inserted into a space between the flushing ring and the shaft sleeve, and the embedded part is fixedly connected to the front end face of the limiting step hole in the flushing ring through a bolt.

6. the sealing device for the main shaft of the disc grinder of the density fiberboard production equipment according to claim 1, wherein: and a third O-shaped sealing ring is also arranged between the sealing seat and the inner hole wall of the flange.

7. The sealing device for the main shaft of the disc grinder of the density fiberboard production equipment according to claim 1, wherein: the front end of the shaft sleeve is connected with a sealing ring, the sealing ring is connected to the outer circumferential surface of the front end of the shaft sleeve through a second torque transmission bolt, the front end of the sealing ring is inserted into a limiting groove in the rear end face of the movable grinding disc, and the outer circumferential surface of the front end of the sealing ring and the inner side face of the limiting groove are sealed through a fourth O-shaped sealing ring.

8. the sealing device for the main shaft of the disc grinder of the density fiberboard production equipment according to claim 1, wherein: the special-shaped sealing ring is a packing.

9. The sealing device for the main shaft of the disc grinder of the density fiberboard production equipment according to claim 1, wherein: and a fifth O-shaped sealing ring is also arranged between the outer side of the flushing ring and the inner surface of the sealing seat.

Technical Field

The invention relates to a main shaft sealing device of a disc mill for preparing fibers on a papermaking or medium (high) density fiberboard production line.

Background

The core equipment of the pulping production line of the papermaking or medium-high density fiberboard is a disc grinder, raw materials are decomposed into qualified fibers in the disc grinder rotating at high speed, and the continuity and the stability of the disc grinder in the operation process are important factors influencing the fiber quality; the disc mill needs to seal and separate steam and pulp in a refining area of a main machine of the disc mill during operation, and the prior art generally adopts two sealing methods to seal and separate: one is packing mechanical seal, the packing is limited and pressed by a pressing ring and a check ring to be in close contact with a shaft, the packing is expanded under the action of a set screw, the auxiliary sealing mode is adopted, a sealing medium is usually added to play a sealing role, the packing has large abrasion to the shaft after working for a period of time, the sealing medium is easy to leak, the service life of sealing parts is short, the working efficiency of equipment is low, the maintenance time is long, the consumption of cooling water is high, and the power consumption of a subsequent drying section is large; the other type is mechanical seal, the structure is complex, the requirement on the machining precision of the main shaft and the parts of the installation part is high, a corresponding sealing cooling system needs to be equipped for use, the requirement on the water quality required by the sealing cooling system is high, and the investment cost of early investment and the investment cost of subsequent maintenance are high.

Disclosure of Invention

The invention aims to solve the technical problem of providing a sealing device for a main shaft of a disc mill of density fiberboard production equipment, which can prevent sealing medium from leaking, reduce abrasion to a sealing component and the main shaft, has the advantages of good sealing effect, reliable performance, simple structure, convenient operation, less maintenance workload and low cost.

the invention relates to a sealing device for a main shaft of a disc mill of density fiberboard production equipment, which comprises a driving main shaft, wherein the front end of the driving main shaft is matched and extends into a grinding chamber body cavity of the disc mill and is fixedly connected with a movable grinding disc, and the sealing device is characterized in that: the driving main shaft is sleeved with a shaft sleeve, a sealing assembly is arranged outside the shaft sleeve and comprises a sealing seat, an oil seal chamber is arranged on the inner side of the sealing seat, and a plurality of groups of special-shaped sealing rings are arranged between the inner cavity of the oil seal chamber and the shaft sleeve;

a flushing ring is arranged at the position, located on the front side of the oil seal chamber, of the space between the seal seat and the shaft sleeve, the front end of the flushing ring is fixedly connected to the front end face of a limiting step hole in the inner cavity of the seal seat through a bolt, and the rear end of the flushing ring is limited and tightly pressed on the oil seal chamber and the special-shaped seal ring;

The sealing seat is fixedly connected with a flange on a mounting hole of the grinding chamber body cavity through an inner side flange;

The flushing ring and the sealing seat are provided with communicated air inlets which are communicated with an external compressed air source, so that positive pressure can be generated between the flushing ring and the shaft sleeve, and the material in the cavity of the grinding chamber body is prevented from leaking from a gap;

an oil inlet hole is formed in the sealing seat, and the oil seal chamber is communicated with the oil inlet hole in the sealing seat;

the rear end of the sealing seat is provided with a sealing cover plate which is fixedly connected to the rear end surface of the sealing seat through a bolt;

The rear end of the shaft sleeve is fixedly connected to the driving main shaft through a first torque transmission bolt;

At least two O-shaped sealing rings are arranged between the inner wall of the shaft sleeve and the outer surface of the driving main shaft;

the outer side of the oil seal chamber is sealed with the seal seat through a plurality of groups of O-shaped seal rings;

The flushing ring is also provided with an air inlet ring groove which is communicated with the air inlet;

the end part of the inner side of the flushing ring is provided with an annular embedded part made of a non-metal wear-resistant material, the embedded part is inserted into a space between the flushing ring and the shaft sleeve and is fixedly connected to the front end face of a limiting step hole in the flushing ring through a bolt;

An O-shaped sealing ring is also arranged between the sealing seat and the inner hole wall of the flange;

the front end of the shaft sleeve is connected with a sealing ring, the sealing ring is connected to the outer circumferential surface of the front end of the shaft sleeve through a second torque transmission bolt, the front end of the sealing ring is inserted into a limiting groove on the rear end face of the movable grinding disc, and the outer circumferential surface of the front end of the sealing ring and the inner side surface of the limiting groove are sealed through an O-shaped sealing ring;

the special-shaped sealing ring is a packing;

And a fifth O-shaped sealing ring is also arranged between the outer side of the flushing ring and the inner surface of the sealing seat.

The invention is used for the sealing means of the main axis of the disc mill of the production facility of the density fiberboard, drive the shaft sleeve outside on the main axis and cooperate and mount the oil seal chamber, wash the ring, the embedded part, the sealing ring through the seal receptacle at the same time, the packing of indoor installation of oil seal, wash the ring to connect the compressed air source through the air inlet, the front end of the sealing ring is inserted into the spacing groove on the back of the movable millstone, seal the pulp and steam of the disc mill defibrination area through the multiunit sealing ring, prevent the sealing medium from leaking, the system enters the compressed air through the air inlet in the course of operation, reduce the leakage of the sealing medium and pulp in the course of defibrination to shaft sleeve and oil seal indoor seal ring group damage, can prevent the sealing medium from leaking, reduce and abrade sealing assembly and main axis, the sealing effect is;

has the following effects:

1. the traditional packing replacement cycle is generally 1-2 months, the service life of the sealing device reaches half a year to 1 year, the continuous operation time of equipment can be prolonged, the maintenance time is shortened, and the working efficiency is improved;

2. Compared with packing, the invention realizes zero leakage, saves a large amount of sealing water and reduces the production cost;

3. the traditional packing seal has more water entering a pulping area, and increases energy required by fiber drying, but the seal realizes zero leakage, so that drying energy consumption can be reduced, and the operation cost is saved;

4. the traditional packing seal requires a large mounting and dismounting space, so that the length of a cantilever of a main shaft is too long, and the stability of equipment operation is influenced;

5. compared with mechanical seal, the structure is simple, a seal cooling system is not required, the early investment and the later maintenance cost are low, the structure is simple, the size is small, the maintenance and the operation are convenient, and the operation cost is low.

Drawings

FIG. 1 is a schematic plan view of a sealing device for a main shaft of a disc grinder of a density fiberboard production equipment according to an embodiment of the invention;

in the figure: 201. driving the main shaft; 202. a movable grinding disc; 203. a fourth O-shaped sealing ring; 204. a seal ring; 205. a second torque transfer bolt; 206. a shaft sleeve; 207. an air inlet; 208. a sealing seat; 209. an oil filling port; 210. a seal seat cover plate; 211. a first O-ring seal; 212. a first torque transmitting bolt; 213. an oil seal chamber; 214. a second O-ring seal; 215. a special-shaped sealing ring; 216. a fifth O-shaped sealing ring; 217. washing the ring; 218. a third O-shaped sealing ring; 219. a flush ring insert; 220. and (4) grinding the chamber body cavity.

Detailed Description

as shown in the figure, the sealing device for the main shaft of the disc mill of the density fiberboard production equipment has the main structure that the sealing device is a conventional disc mill for papermaking or manufacturing a pulping production line of medium and high density fiberboards, the front end of a driving main shaft 201 of the disc mill is matched and extended into a grinding chamber body cavity 220 of the disc mill and is fixedly connected with a movable grinding disc 202, and the driving main shaft 201 drives the movable grinding disc 202 to rotate during the operation of the system and is matched with the grinding chamber body cavity 220 for grinding pulp; in the embodiment, firstly, a shaft sleeve 206 is sleeved on a driving main shaft 201, a group of sealing components are arranged outside the shaft sleeve 206 in a matching way, and the leakage of sealing media in the operation process and the abrasion of pulp in the refining process on the shaft sleeve 206 and parts in the sealing components are reduced by the sealing components; the sealing assembly has the following specific structure:

a sealing seat 208 is fixedly arranged in the grinding chamber body cavity 220, and the sealing seat 208 is fixedly connected with a flange on a mounting hole of the grinding chamber body cavity 220 through an inner side flange; the sealing seat 208 is sleeved outside the shaft sleeve 206, the inner diameter of the sealing seat 208 is larger than the outer diameter of the shaft sleeve, an oil seal chamber 213 is arranged in a space between the sealing seat and the shaft sleeve and close to the rear end of the shaft sleeve, a plurality of groups of special-shaped sealing rings 215 are arranged between the inner cavity of the oil seal chamber 213 and the shaft sleeve, packing can be directly selected by the special-shaped sealing rings, three groups of packing are arranged in the oil seal chamber in the embodiment, a limiting space ring is arranged in the inner cavity of the oil seal chamber, the three groups of packing are arranged in a separated mode, two groups of packing on the rear side of the limiting;

a flushing ring 217 is arranged at the position, located on the front side of the oil seal chamber, of the space between the sealing seat 208 and the shaft sleeve 206, the front end of the flushing ring 217 is fixedly connected to the front end face of a limiting step hole in the inner cavity of the sealing seat 208 through bolts, the rear end of the flushing ring 217 is simultaneously limited and pressed on the front end of the oil seal chamber 213, and the end faces of a group of packing rings located on the front side of a limiting spacing ring in the oil seal chamber; an oil inlet 209 is arranged on the sealing seat 208, the oil seal chamber is communicated with the oil inlet on the sealing seat, and oil can be injected into or supplemented into the oil seal chamber through the oil inlet; a sealing cover plate 210 is arranged at the rear end of the sealing seat 208, and the sealing cover plate 201 is fixedly connected to the rear end face of the sealing seat 208 through bolts; the front side and the rear side of the oil seal chamber and the packing are respectively limited and compressed by the flushing ring 217 and the sealing cover plate 201.

set up an inlet port on seal receptacle 208, wash the air flue that sets up on the circle 217 and go up air pocket 207 intercommunication with seal receptacle 208, inlet port 207 and outside compressed air source intercommunication provide compressed air through outside compressed air source, make and wash and produce the malleation between circle 217 and the axle sleeve 206, ensure that the material in mill room body cavity 220 can not leak from the clearance, prevent wearing and tearing oil blanket room, abnormal shape sealing washer, the indoor grease of oil blanket can not get into mill room body cavity inside simultaneously yet, can not cause the material pollution.

an annular air inlet ring groove is formed in the flushing ring 217, the air inlet ring groove is communicated with the air inlet hole 207, external compressed air enters the interior of the flushing ring through the air inlet hole 207 and then uniformly circulates in the air inlet ring groove, and pressure is uniformly distributed; a plurality of air passages can be arranged along the circumferential direction of the flushing ring, so that the installation and operation are convenient.

Two first O-shaped sealing rings 211 are arranged between the inner wall of the shaft sleeve 206 and the outer surface of the driving main shaft 201, and the rear end of the shaft sleeve 206 is fixedly connected to the driving main shaft 201 through a first torque transmission bolt 212, so that the installation is stable and reliable.

furthermore, an annular embedded part 219 made of a non-metal wear-resistant material is arranged inside the front end of the flushing ring 217, and the embedded part 219 is inserted into a space between the flushing ring 217 and the shaft sleeve 206 and is fixedly connected to the front end surface of a limiting step hole inside the flushing ring 217 through a bolt; when the shaft sleeve rotates along with the driving main shaft, the direct abrasion between the washing ring and the shaft sleeve is prevented through the embedded part, the abrasion loss is concentrated on the surface of the embedded part, the replacement operation of the embedded part is convenient, the consumed time is short, and the cost is low.

Furthermore, the front end of the shaft sleeve is connected with a sealing ring 204, the sealing ring 204 is connected to the outer circumferential surface of the front end of the shaft sleeve through a second torque transmission bolt 205, the front end of the sealing ring is inserted into a limiting groove on the rear end surface of the movable grinding disc, and the outer circumferential surface of the front end of the sealing ring and the inner side surface of the limiting groove are sealed 203 through a fourth O-shaped sealing ring;

the outer side of the oil seal chamber 213 is sealed with the seal seat 208 through a plurality of groups of second O-shaped seal rings 214, a third O-shaped seal ring 218 is also arranged between the seal seat 208 and the inner hole wall of the flange, a fifth O-shaped seal ring 216 is also arranged between the outer side of the flushing ring and the inner surface of the seal seat, and slurry and steam in a grinding area are ground through a seal disc grinder through the plurality of groups of seal rings, so that the leakage of a sealing medium is prevented, the leakage of the sealing medium in the running process and the damage of the slurry to the shaft sleeve and the seal ring group in the oil seal chamber in the grinding process are reduced, the sealing effect is good, the performance is reliable, the structure.

The specific design concept is as follows:

The sealing device comprises the shaft sleeve, the sealing ring and the universal sealing component, the problem of leakage of a sealing medium is solved through the sealing ring and the universal sealing component, the sealing effect is realized, and meanwhile, compressed air is introduced into the sealing seat in the operation process, so that the leakage of the sealing medium in the operation process and the damage of slurry to the shaft sleeve and the sealing ring group in the oil seal chamber in the pulping process can be reduced.

When the invention works, the driving main shaft 201 rotates, the shaft sleeve 206, the sealing ring 204 and the movable grinding disc 202 rotate together at high speed under the action of the driving main shaft 201, and a general sealing device consisting of a sealing seat cover plate 210, an oil seal chamber 213, three groups of special-shaped sealing rings 215, a flushing ring 217, a flushing ring embedded part 219 and a sealing seat 208 keeps still; three groups of special-shaped sealing rings 215 in the universal sealing device rotate relative to the shaft sleeve 206, under the action of a circulating sealing medium (compressed air) and the three groups of special-shaped sealing rings 215, steam and pulp in a grinding working area cannot enter a rear end non-working area, the special-shaped sealing rings 215 are protected from being damaged, meanwhile, lubricating media of the three groups of special-shaped sealing rings 215 cannot enter the grinding working area, the effect of sealing two sides is achieved, and the sealing rings 204 on the front end of the driving main shaft and the back surface of the movable grinding disc 202 and the first O-shaped sealing ring 211 arranged in the shaft sleeve 206 can effectively prevent the steam and the pulp in the grinding working area from damaging the driving main shaft 201.