CN2151251Y - Air joint - Google Patents

Abstract

The utility model belongs to a sealing device, particularly an air guiding joint in the back rotation mechanism of the tooth wheel drill used for the mine. The structure of the sealing device is a rubber pad is arranged between the flange on the outer shell of the air guiding joint and the flange of the main air pipe and adopts the form that the top portion of a hollow axle is sealed. A sealing element is arranged between the pipe opening of the main air pipe and the top portion of the hollow axle and is limited by the middle hole of the flange on the air guiding joint. The sealing element is a sealing sleeve comprising two portions whose upper portion is a rubber spring and lower portion is a V-shaped circular ring filled with tetrafluoroethene. The utility model efficiently eliminates the leakage phenomenon and also the service life of the sealing element is obviously prolonged.

Description

Air joint

Belong to a kind of sealing device, particularly be Air joint in the mining rotary drill slew gear.

Rotary drill is one of main perforating apparatus in mine, and the Air joint in the rig slew gear is that the compressed air in the guiding air main enters the hollow shaft seal of revolution.Air joint commonly used at present, be female by the axle that screw thread is rotary with a convex on the top of hollow shaft, at the sealing ring that a band skeleton is arranged between the hole on convex nut and the Air joint shell, during rig work, the convex nut on hollow shaft and top thereof rotates under the drive of rotary reducer, and the sealing ring on convex nut and the Air joint shell between the hole is used for sealing, prevents that compressed air from leaking, realize the air inducing effect, for example the 45R rotary drill of the import U.S. adopts this Air joint exactly.Facts have proved that the Air joint of this form of structure is because the accumulation of error of hollow shaft system nonconcentricity, the accumulation of the nonconcentricity error of Air joint shell upper and lower end flange hole in addition, cause the sealing ring radial beat eccentricity bigger, impel ring wear very fast, so that leakage problem occurs.Its consequence is that blast reduces, and wind loss influence deslagging at the bottom of the hole, in the rotary gear box of the sewage that contains in the compressed air sometimes inflow its underpart.Destroyed lubricating between each parts, shortened the application life of adjacent component, especially winter, too much because of ponding, the interior generation of casing is freezing, and turning motor can't start, and directly threatens the mine to produce.

The purpose of this utility model is the technical measures of taking at the problems referred to above, and a kind of good sealing effect is provided, and is simple in structure, cheap, the sealing device of long service life.

This novel Air joint is the improvement that existing Air joint is done, the parts such as male nut, shelves ring and bolt on cancellation original device hollow mandrel top, between Air joint shell upper flange and air main flange, be provided with a rubber cushion, adopt hollow shaft top seal form, its potted component internal diameter is consistent with air main spout diameter and hollow shaft internal orifice dimension, said potted component is installed between the air main mouth of pipe and the hollow shaft top, and is retrained by Air joint shell upper flange mesopore.Potted component is a sealing shroud, and it is to be made of two parts, with air main mouth of pipe contact jaw be rubber spring, with hollow shaft top contact jaw for filling the tetrafluoroethene annulus.The filling tetrafluoroethene annulus of potted component bottom can be processed into the V-type annulus, and bonds together with the rubber spring on its top.Potted component is taked this structure and installation form, main purpose is to realize revolution hollow shaft top seal by axial compression, potted component axial compression size, can and adjust the rubber cushion thin and thick by the bolt on the locking air main flange obtains, in addition, potted component can also absorb axial impact and radially reverse the vibration that brings, with the Air joint upper flange mesopore potted component that uses restraint, its rigidity, intensity level is bigger many than free state, stability when having guaranteed Air joint work, the V-type of potted component bottom is filled the tetrafluoroethene annulus, has good wear-resisting and self-lubricating property, has satisfied and the sealing of rotating hollow shaft and lubricated.

Because the utility model has directly adopted hollow shaft top seal form, has cancelled the part in the original device, has simplified its internal construction, has made things convenient for dismounting and maintenance, has reduced cost.Choosing of potted component material and form of structure stopped leakage phenomenon effectively, and also phenomenal growth in the application life of potted component, thereby improved the rig operating efficiency.

Describe the utility model structure and the course of work in detail below in conjunction with accompanying drawing, accompanying drawing is a front view of the present utility model, as shown in the figure, and shell (1), rubber cushion (2), air main (3), bolt (4), sealing shroud (5), hollow shaft (6).Sealing shroud (5) is inserted shell (1) upper flange mesopore, dock with air main (3) mouth of pipe and hollow shaft (6) top respectively its upper and lower part, after the flange of air main (3) and shell (1) upper flange are fastening with bolt (4), the rubber spring of compression seal cover (5), make it to produce certain axial compression, make the V-type of sealing shroud (5) bottom fill the top that the tetrafluoroethene annulus is pressed in hollow shaft (6) tightly, hollow shaft (6) rotation, and sealing shroud (5) is motionless, and the compressed air that has water oil passes through Air joint smoothly.Hollow shaft (6) top requires to have higher roughness, increase sealing performance on the one hand, reduce sealing shroud (5) bottom V-type on the other hand and fill the wearing and tearing of tetrafluoroethene annulus, in case produce wearing and tearing, can fastening bolt (4) or change thin any rubber cushion (2).

Claims (2)

1, a kind of Air joint, form by shell, potted component etc., it is characterized in that: between shell upper flange and air main flange one rubber cushion is arranged, be installed between the air main mouth of pipe and the hollow shaft top and be a sealing shroud by the potted component of Air joint shell upper flange mesopore constraint, it is to be made of two parts, with air main mouth of pipe contact jaw be rubber spring, with hollow shaft top contact jaw for filling the tetrafluoroethene annulus.

2, according to the described device of claim 1, it is characterized in that: the filling tetrafluoroethene annulus of potted component bottom is the V-type annulus, can bond together with its top rubber spring.

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