CN201239902Y

CN201239902Y - Changeable built-in live center

Info

Publication number: CN201239902Y
Application number: CNU2008201477130U
Authority: CN
Inventors: 张朝煌; 高化民
Original assignee: HENAN ACTIVE CENTRE MACHINERY CO Ltd
Current assignee: HENAN ACTIVE CENTRE MACHINERY CO Ltd
Priority date: 2008-06-30
Filing date: 2008-06-30
Publication date: 2009-05-20
Anticipated expiration: 2018-06-30

Abstract

The utility model relates to a built-in removable running centre, which comprises a seat shell, a front end closure, a rear end closure, a tail spindle arranged inside the seat shell and a centre head arranged on the tail spindle. A cylindrical roller bearing is arranged between the front end of the tail spindle and the seat shell; a needle bearing and a deep groove sealed bearing are arranged at the rear end of the tail spindle; an adjusting pad is arranged on one side of the cylindrical roller bearing; an aligning roller thrust bearing is arranged between a stepped surface arranged at the middle part of the tail spindle and the matching stepped surface inside the seat shell; at least two sets of elastic components are evenly distributed on a rear head face of the aligning roller thrust bearing; the centre head is a withdrawable movable component; and a trip bolt is fixed on the tail spindle. The built-in removable running centre has short cantilever at an extending end, good rigidity, long service life, large load bearing, high precision and good processing technique; the centre head can be replaced, thereby being convenient for replacing and maintaining; and a middle bracket is also omitted, thereby lowering the manufacturing cost and enhancing the market competitive power of an enterprise.

Description

Changeable built-in live center

Technical field

The utility model relates to heavy roll plant equipment, is used for a kind of changeable built-in live center on the heavy roll plant equipment specifically.

Technical background

At present, the top back dead centre that mostly is that uses on the heavy machine tools such as market topping roll machinery, in grinding process, workpiece two centre bores that occur grind wound easily, the carriage wearing and tearing, lose machining benchmark, can't guarantee machining accuracy, existing live center is because load-bearing is limited, reasons such as support difficulty are used on the mini-plant mostly, live center adopts rolling bearing usually, and the play that rolling bearing exists makes the rotating accuracy of live center itself not satisfy machining accuracy degree needs, and, its parts are easy to wear, service life is short, stock-removing efficiency is low, cause the production cost height, can't satisfy the needs that enterprise produces, restricted the development of enterprise.In the prior art, its top armshaft is longer, and general armshaft is arranged on the outer end of equipment, makes the stressed increasing of its armshaft, the use that can not bear large-tonnage equipment; Centre head can not be changed, and its holding capacity is less, when bearing capacity increases greater than the top spoilage of 50 ton hours, can't satisfy normal production needs.Changeable built-in live center is meant the axle system that live center and workpiece spindle and tailstock tool axle are integrated, characteristics such as common built-in live center external part cantilever weak point, good rigidly are promptly arranged, have specialities such as interchangeable top processing technology is good, precision is high, easy to maintenance again.

Summary of the invention

The purpose of this utility model is for the deficiency that solves the problems of the technologies described above, and provides that a kind of load-bearing is big, precision is high, long service life, the removable changeable built-in live center of centre head.

The utility model is the deficiency that solves the problems of the technologies described above, the technical scheme that is adopted is: a kind of changeable built-in live center, comprise a shell, drive end bearing bracket, rear end cap, be contained in tail spindle and the centre head that is located on the tail spindle in the shell, between the front end of tail spindle and the seat shell cylinder roller bearing is housed, the rear end of tail spindle is provided with needle bearing and zanjon sealed bearing, cylinder roller bearing one side is provided with spacer, be provided with self-aligning thrust roller bearing between the step surface at tail spindle middle part and the step surface that matches in the shell inboard, at the elastic parts that is laid with at least on the rear end face of self-aligning thrust roller bearing more than three groups, centre head is a removable movable component, is fixed on the tail spindle by trip bolt.

The utility model, described cylinder roller bearing are double row cylindrical roller bearing.

The utility model, described elastic parts comprise regulates lining and flexible member.

The utility model, described flexible member is arranged in the dish spring groove by two groups of rightabout dish springs.

The utility model is provided with rotary-type sealing ring in the described drive end bearing bracket.

The utility model is provided with sealing gasket and butterfly spring between described needle bearing and the zanjon sealed bearing.

The utility model, cylinder roller bearing can be adjusted the inner play of bearing exactly by the spacer that is provided with, and improves the precision and the rigidity of live center; Use self-aligning thrust roller bearing to replace the original thrust ball bearing that uses, it is many to make load-bearing capacity improve twice, bears equal axial force and will improve ten times its service life; Elastic parts can design and regulates and control by the required axial carrying of processing, can suitably be compressed when processing produces bigger heat in metal cutting, thereby when axial load during because of the excessive workpiece axial elongation of heat in metal cutting, the bearing of bearing thrust also can normally stable operation; Butterfly spring pulls back tail spindle, is in good operation situation all the time to keep self-aligning thrust roller bearing; According to the processing needs, can select corresponding top angle to change centre head by the centre bore of workpiece.

The beneficial effects of the utility model are:

1, load-bearing is big, precision is high, processing technology is good.

2, centre head is interchangeable, and is easy to replace and maintain.

3, short, the good rigidly of built-in live center external part cantilever.

4, long service life can be saved intermediate bracket again, greatly reduces production cost, has improved the market competitiveness of enterprises.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the schematic diagram of a kind of elastic parts of the utility model.

Mark among the figure: 1, seat shell, 2, drive end bearing bracket, 3, rear end cap, 4, tail spindle, 5, centre head, 6, cylinder roller bearing, 7, spacer, 8, self-aligning thrust roller bearing, 9, elastic parts, 10, needle bearing, 11, the zanjon sealed bearing, 12, regulate lining, 13, flexible member, 14, rotary-type sealing ring, 15, sealing gasket, 16, butterfly spring, 17, trip bolt.

The specific embodiment

Changeable built-in live center as shown in Figure 1, comprise a shell 1, drive end bearing bracket 2, rear end cap 3, be contained in tail spindle 4 and the centre head 5 that is located on the tail spindle 4 in the shell 1, between the front end of tail spindle 4 and the seat shell 1 double row cylindrical roller bearing 6 is housed, the rear end of tail spindle 4 is provided with needle bearing 10 and zanjon sealed bearing 11, double row cylindrical roller bearing 6 one sides are provided with spacer 7, be provided with self-aligning thrust roller bearing 8 between the step surface at tail spindle 4 middle parts and the step surface that matches in seat shell 1 inboard, at the elastic parts 9 that is laid with at least on the rear end face of self-aligning thrust roller bearing 8 more than three groups, elastic parts 9 comprises regulates lining 12 and flexible member 13, flexible member 13 is a bridge-type cushion structure, be similar to the yellow operation principle of ripple, centre head 5 is a removable movable component, is fixed on the tail spindle 4 by trip bolt 17.

The utility model is provided with rotary-type sealing ring 14 in the described drive end bearing bracket 2.

The utility model is provided with sealing gasket 15 and butterfly spring 16 between described needle bearing 10 and the zanjon sealed bearing 11.

As shown in Figure 2, the utility model, flexible member 13 also can be made up of two groups of dish springs, and two groups of dish springs are oppositely placed.

The utility model, cylinder roller bearing 6 can be adjusted the inner play of bearing exactly by the spacer 7 that is provided with, and improves the precision and the rigidity of live center; Use self-aligning thrust roller bearing 8 to replace the original thrust ball bearing that uses, it is many to make load-bearing capacity improve twice, bears equal axial force and will improve ten times its service life; Elastic parts 9 can design and regulates and control by the required axial carrying of processing, when producing bigger heat in metal cutting, processing can suitably be compressed, thereby when axial load during because of the excessive workpiece axial elongation of heat in metal cutting, the bearing of bearing thrust also can normally stable operation; Butterfly spring 16 pulls back tail spindle 4, is in good operation situation all the time to keep thrust force aligning Roller Shaft 8 to hold; According to the processing needs, can select corresponding top angle to change centre head 5 by the centre bore of workpiece.

Use changeable built-in live center of the present utility model, bear heavy duty more than 50 tons, the machining accuracy height, error can improve service life less than 3 μ m, can save intermediate bracket again, reduces production costs greatly, has improved the market competitiveness of enterprises.

Claims

1, a kind of changeable built-in live center, comprise a shell (1), drive end bearing bracket (2), rear end cap (3), be contained in the tail spindle (4) in the shell (1) and be located at centre head (5) on the tail spindle, between the front end of tail spindle (4) and the seat shell (1) cylinder roller bearing (6) is housed, the rear end of tail spindle (4) is provided with needle bearing (10) and zanjon sealed bearing (11), it is characterized in that: cylinder roller bearing (6) one sides are provided with spacer (7), be provided with self-aligning thrust roller bearing (8) between the step surface at tail spindle (4) middle part and the step surface that matches in shell (1) inboard, at the elastic parts (9) that is laid with at least on the rear end face of self-aligning thrust roller bearing (8) more than three groups, centre head (5) is a removable movable component, is fixed on the tail spindle (4) by trip bolt (17).

2, a kind of changeable built-in live center according to claim 1 is characterized in that: described cylinder roller bearing (6) is a double row cylindrical roller bearing.

3, a kind of changeable built-in live center according to claim 1 is characterized in that: described elastic parts (9) comprises regulates lining (12) and flexible member (13).

4, a kind of changeable built-in live center according to claim 3 is characterized in that: described flexible member (13) is arranged in the dish spring groove by two groups of rightabout dish springs.

5, a kind of changeable built-in live center according to claim 1 is characterized in that: be provided with rotary-type sealing ring (14) in the described drive end bearing bracket (2).

6, a kind of changeable built-in live center according to claim 1 is characterized in that: be provided with sealing gasket (15) and butterfly spring (16) between described needle bearing (10) and the zanjon sealed bearing (11).