CN2316070Y

CN2316070Y - Head-changed live center

Info

Publication number: CN2316070Y
Application number: CN 98213097
Authority: CN
Inventors: 李金利; 李晓霞
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-03-03
Filing date: 1998-03-03
Publication date: 1999-04-28
Anticipated expiration: 2008-03-03

Abstract

The utility model discloses a head-changed type live centre, which mainly comprises a shell, a centre head and centre shaft which is arranged in the shell. A row of bearings is distributed between a shaft body of the centre shaft and the shell, a group of 8224 thrust bearings and a group of 2000 number radial roller bearings are arranged between a head of the centre shaft and the shell, a head of the centre shaft is provided with a taper hole, and the connecting position of the lower part of the centre head and the centre shaft is provided with a taper which is matched with the taper hole of the centre shaft. Four threaded holes are evenly distributed on the circumference of the centre head, and the centre head is tight fixed by four screws and the centre shaft. The utility model has the advantages of simple structure and convenient replacement; when a roll with different angles is processed, users only need to change the centre head, so the utility model has low use cost.

Description

The replaceable head live center

The utility model belongs to the processing roll live center, particularly a kind of replaceable head live center.

Using the live center processing roll at present is in order to the raising man-haur efficiency, and it processes a kind of live center of the corresponding a pair of identical angle of roll of angle.Existing live center is that centre head, tail spindle and shell are as whole an appearance.If when the angle of processing roll changes, must integral body replace a pair of live center.The roll that lathe or grinding machine will be processed 60 °, 70 °, 75 °, 90 ° four kinds of angles must have four pairs of different live centers of centre head angle and could satisfy use, it is inconvenient that live center is changed, use cost is too high, has influenced its large tracts of land and has popularized.

The purpose of this utility model provides a kind of replacing convenience, use cost is low, only need change the replaceable head live center of centre head when processing the roll of different angles.

The purpose of this utility model adopts following technical scheme to realize: described live center comprises housing, centre head and the tail spindle that is positioned at housing, be distributed with row's bearing between tail spindle axle body and the housing, one group of 8224 thrust bearing and one group of No. 2000 radial roller bearing are set between the head of tail spindle and the housing, the tail spindle head has a taper hole, there is the tapering that matches with the tail spindle taper hole centre head bottom with the tail spindle connecting portion, evenly issued four silk holes around centre head, centre head is fastening by four screws and tail spindle.Bearing between tail spindle axle body and the housing is made up of even number bearing and odd number bearing, odd number bearing and the cross arrangement of even number bearing.No. 2000 radial roller bearings between tail spindle head and the housing, its diameter and tail spindle axis are 1: 5 to the ratio of bearing outside diameter distance, 8224 thrust bearings between tail spindle head and the housing, its diameter and tail spindle axis are 5: 17 to the ratio of bearing outside diameter distance.

In order to make centre head easy to loading and unloading, on centre head, also be distributed with four silk holes, silk is connected with the screw that is used for outwards extracting centre head on the hole, and screw presses closer the recess on plane on the tail spindle.

Between the lower plane in plane on the tail spindle and top captacula hole, be provided with and be used to adjust the adjustment pad that cooperates tight power.

Because centre head of the present utility model and tail spindle taper fit, cooperate closely, not grinding shaft and axis hole during use, bearing in the housing between tail spindle and the housing is to form with the cross arrangement of even number odd number, it is more steady to get into smooth, roll fineness after the grinding is improved, reduced the shake line of roll again.Work in-process only need be changed centre head as the change machining angle and get final product, as 60 °, 70 °, 75 °, 90 ° four kinds of angles of processing on car, the grinding machine, only need to use a pair of live center, can realize the function of existing four pairs of live centers by changing centre head, one can be pushed up four usefulness, and this makes manufacturing cost reduce by 70%.In sum, the utility model is simple in structure, replacing is convenient, use cost is low, is the higher processing equipment of a kind of promotional value.

Below in conjunction with embodiment the utility model is further described;

Accompanying drawing 1 is the utility model structural representation.

As shown in the figure, described live center mainly comprises housing 16, centre head 1 and the tail spindle 15 that is positioned at housing 16, be distributed with row's bearing 14 between tail spindle 15 axle bodies and the housing 16, bearing 14 has 3 groups of odd numbers and 4 groups of even number bearings, odd number bearing and the cross arrangement of even number bearing, its ball is positioned over the retainer 17 of even hole and the retainer 12 in odd number hole, and retainer and retainer are provided with adjusts ring 13, placement positioning ring 11 between retainer and the housing 16.One group of 8224 thrust bearing 10 and one group of No. 2000 radial roller bearing 7 are set between the head of tail spindle 15 and the housing 16, bearing 7 balls are arranged on the retainer 8, retainer 8 bottoms are placed on the retainer seat cushion 9, housing 16 preceding big lids 4 have oil sealing 6 and cover plane on housing 16, and are fixing with screw 5 between the two.The back heap 18 of housing 16 bottoms is fixing by screw and housing 16.The diameter of bearing 7 and tail spindle 15 axis are 1: 5 to the ratio of bearing outside diameter distance, and the diameter of bearing 10 and tail spindle 15 axis to the ratio of bearing 10 external diameter distances are: 5: 17.

Tail spindle 15 heads have a taper hole, centre head 1 bottom and tail spindle 15 connecting portions have with tail spindle 15 on the tapering that matches of taper hole, around centre head 1, be evenly distributed with four silk holes, centre head 1 is fastening by four screws 2 and tail spindle 15.Also be distributed with 4 silk holes on the centre head 1, silk is connected with the screw that is used for outwards extracting centre head 1 on the hole, and screw presses closer the recess on plane on the tail spindle 15.Between the lower plane in silk hole on plane on the tail spindle 15 and the centre head 1, be provided with and be used to adjust the adjustment pad 3 that cooperates tight power.

Claims

1, a kind of replaceable head live center, comprise housing (16), centre head (1) and the tail spindle (15) that is positioned at housing (1), be distributed with row's bearing (14) between tail spindle (15) axle body and the housing (16), one group of 8224 thrust bearing (10) and one group of No. 2000 radial roller bearing (7) are set between tail spindle (15) head and the housing (16), it is characterized in that: tail spindle (15) head has a taper hole, the tapering that centre head (1) bottom has with the tail spindle connecting portion and tail spindle (15) taper hole matches, be evenly distributed with four silk holes all around at centre head (1), centre head (1) is fastening by four screws and tail spindle (15), between tail spindle (15) axle body and the housing one row's bearing (14) is made up of odd number bearing and even number bearing, odd number bearing and the cross arrangement of even number bearing, the diameter of radial roller bearing (7) and tail spindle (15) axis are 1: 5 to the ratio of bearing (7) external diameter distance, and the diameter of thrust bearing (10) and tail spindle (15) axis are 5: 17 to the ratio of bearing (10) external diameter distance.

2, replaceable head live center according to claim 1 is characterized in that: also be distributed with four silk holes on centre head (1), silk is connected with the screw that is used for outwards extracting centre head (1) on the hole, and screw presses closer the recess that tail spindle (15) is gone up the plane.

3, replaceable head live center according to claim 1 is characterized in that: be provided with between the lower plane in the last plane of tail spindle (15) and centre head (1) silk hole and be used to adjust the adjustment pad (3) that cooperates tight power.