CN201871739U

CN201871739U - Precision gap reduction positioning device for rotary shaft

Info

Publication number: CN201871739U
Application number: CN2010206192479U
Authority: CN
Inventors: 毛玉鹏; 胥海量
Original assignee: SHAANXI SIKEDA ENVIRONMENTAL PROTECTION POWER MACHINERY CO Ltd
Current assignee: SHAANXI SIKEDA ENVIRONMENTAL PROTECTION POWER MACHINERY CO Ltd
Priority date: 2010-11-19
Filing date: 2010-11-19
Publication date: 2011-06-22
Anticipated expiration: 2020-11-19

Abstract

The utility model provides a precision gap reduction positioning device for a rotary shaft. The inner surface of a conical top ring is a conical surface; a guide groove is arranged on a shaft sleeve; the conical top ring is clamped in the guide groove; thrust ball bearings are mounted on two lateral surfaces of the conical top ring; a piston placed in a body is positioned axially by a piston end cap; bulb ejector rods and slip sleeves are mounted in three holes of the shaft sleeve; the inner walls of the slip sleeves are tightly attached to a spindle; the outer walls of the slip sleeves contact with the inner walls of the bulb ejector rods; the conical top ring presses spherical surfaces of the bulb ejector rods; a spring is mounted between an end cap and the piston end cap; an adjusting washer is mounted between the piston end cap and the piston; and a sealing ring is mounted at a matching position between the piston and the body. The precision gap reduction positioning device for a rotary shaft adopts a hydraulic cylinder to drive a conical surface hold-down mechanism, ensures rotation precision and axial positioning precision in operation of the spindle, realizes automated control by replacing a traditional manual operation with hydraulic operation, has the advantages of simple structure, compact arrangement, convenience in gap reduction, simplicity and convenience in positioning, high rotation precision, high coaxiality and the like, provides fine rotation precision for the rotary shaft of a numerically controlled machine tool, solves the problem of axial drifting, and ensures processing precision of the numerically controlled machine tool.

Description

A kind of gyroaxis is with the precision crack positioner that disappears

Technical field

The utility model relates to a kind of gyroaxis with the precision crack positioner that disappears, and the precision that specifically is applicable to have relatively high expectations spindle rotation accuracy and axial precision such as machine tool, the Digit Control Machine Tool crack positioner that disappears belongs to the frame for movement technical field.

Background technology

Along with the high speed development of China's mechanical industry, the especially development of high-precision numerical control machine, more and more to the demand of Digit Control Machine Tool, simultaneously the technical parameter of equipment is had higher requirement.Concerning Digit Control Machine Tool, guarantee the circular runout of main shaft and the quality that axial float directly has influence on workpiece, be two important technological parameters of precision machine tool.

With the boring machine is example, the axiality of boring bar and milling spindle relies on the spacer between them to guarantee, the revolution axiality is high more when cooperating tight more its work between them, but cooperate tension can hinder the feeding of boring bar again, therefore when design, tend to leave between them the free feeding that a certain amount of gap guarantees boring bar, this has also just reduced the running accuracy of boring bar simultaneously.How could realize both can having guaranteed the free feeding of main shaft, can guarantee the running accuracy of main shaft again, be the significant problem of pendulum in face of each lathe manufacturer.

At present that what adopt is manually to clamp and regularly adjust the mode of changing parts to lathe is more, and its precision is limited, adjusts difficulty, is difficult to realize automation control, and manually clamps and do not unclamp with regard to feeding after being easy to cause clamping, destroys lathe; The Digit Control Machine Tool locking device generally relies on the band-type brake function of ball-screw and motor at present, owing to have the gap between ball and the leading screw, the axial float problem is inevitable, and the leading screw load is excessive in the work, and this will have a strong impact on the service life of leading screw.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned weak point, provides a kind of gyroaxis with the precision crack positioner that disappears, and has simple in structure, compact in design, the crack that disappears is convenient, the location is easy, rotating accuracy height, axiality advantages of higher.For the Digit Control Machine Tool gyroaxis provides good rotating accuracy, solved the axial float problem, guaranteed machining accuracy of NC machine tool.

The technical solution of the utility model is, a kind of gyroaxis is with the precision crack positioner that disappears, and taper apical ring inner surface is the conical surface, has gathering sill on the axle sleeve, and the taper apical ring is stuck in the gathering sill; Thrust ball bearing is installed in the two sides of taper apical ring, and in the piston of packing into then, screw b compresses thrust ball bearing by the piston end cap; Piston is packed into and is carried out axial location by the piston end cap among the body; Guide pad is installed on the body by screw b, is stuck in the groove of piston; Bulb push rod and watt cover are housed in three holes of axle sleeve, and a watt cover inwall is close to main shaft, and outer wall contacts with bulb push rod inwall, composition spindle assemblies, the spindle assemblies internal piston of packing into; The taper apical ring crown bar sphere of trapping the ball; Between end cap and the piston end cap spring is housed; The adjustment packing ring is housed between piston end cap and the piston; Sealing ring is equipped with in cooperation place between piston and the body.

Screw a is installed on the end cap, as the lead of spring; End cap is installed on the body by screw d.

Compared with the prior art the utility model has the following advantages:

The utility model adopts hydraulic circuit control, has improved production efficiency, has realized automation control; Realize between piston and the body relative static at circumferencial direction, prolonged the service life of sealing ring; Realized between taper apical ring and the bulb push rod relative static at circumferencial direction having reduced the wearing and tearing of bulb push rod and taper apical ring.

Description of drawings

Fig. 1 is the utility model structure general assembly drawing

Fig. 2 is the local enlarged diagram of Fig. 1.

Fig. 3 is the K-K cutaway view of Fig. 1.

The specific embodiment

Below in conjunction with accompanying drawing the utility model content is further described:

As shown in Figure 1, the utility model comprises screw a1, spring 2, packing ring 3, axle sleeve 4, main shaft 5, bulb push rod 6, taper apical ring 7, oil circuit 8, body 9, thrust ball bearing 10, piston 11, guide pad 12, screw b13, piston end cap 14, screw c15, screw d16, end cap 17, sealing ring 18 and watt cover 19 etc.

Thrust ball bearing 10 is contained in the two sides of taper apical ring 7, in the piston 11 of packing into then, compresses thrust ball bearing 10 with screw c15 by piston end cap 14, adjusts the pretightning force of thrust ball bearing 10 by adjusting packing ring 3.

Piston 11 is packed among the body 9, carries out axial location by piston end cap 14; Sealing ring 18 is equipped with in cooperation place between piston 11 and the body 9, leaks to prevent hydraulic oil; Screw a1 is installed on the end cap 17, as the lead of spring 2; End cap 17 is installed on the body by screw c16, interacts by the spring 2 that is contained on the screw d16 between end cap 17 and the piston end cap 14.Guide pad 13 is installed on the body 9 by screw b13, is stuck in the groove of piston 11, makes between body and the piston not relatively rotate.

Bulb push rod 6 and watt cover 19 are housed in three holes of axle sleeve 4, watt the cover 19 inwalls be close to main shaft 5, outer wall contacts with bulb push rod 6 inwalls, form spindle assemblies, the spindle assemblies internal piston of packing into is with taper apical ring 7 crown bar 6 spheres of trapping the ball, and taper apical ring 7 is stuck in the gathering sill of axle sleeve 4, the rotation that assurance taper apical ring 7 and main shaft are 5 realizes and the synchronism of main axis rotation with speed, avoids the circumferential friction of bulb push rod 6 and taper apical ring 7.

The operation principle of the present utility model and the course of work:

After main shaft 5 feedings put in place, hydraulic oil enters in the cavity between piston 11 and the body 9 by oil circuit 8, because piston 11 is different with contact-making surface area before and after the hydraulic oil, under the effect of hydraulic oil, to piston 11 thrust to the right greater than left thrust, thereby promoting piston 11 moves right, driving taper apical ring 7 moves right, taper apical ring 7 mobile forces sphere push rod 6 to move to spindle axis, compress watt cover 19, a watt cover 19 is held main shaft 5 tightly, makes in the main axis rotation process around its axis rotation, avoid because the rotary oscillation that the gap produces has improved machining accuracy greatly.Simultaneously because a watt cover 19 has been held main shaft 5 tightly, make it can not axial float, both guaranteed machining accuracy, reduced impact again to the rear-end of spindle feed mechanism, extended its service life greatly.

Piston 11 moves right, compressed the spring 2 that is contained between piston end cap 14 and the end cap 17 simultaneously, when the needs axis feeding, the hydraulic oil pressure release, piston 11 is moved to the left under the effect of spring 2 elastic force, get back to the origin-location, the pressure of 7 pairs of bulb push rods 6 of taper apical ring disappears, thereby the power of holding tightly of watt 19 pairs of main shafts 5 of cover disappears, and has realized the free feeding of main shaft.

Claims

1. a gyroaxis is characterized in that with the precision crack positioner that disappears taper apical ring (7) inner surface is the conical surface, and axle sleeve has gathering sill on (4), and taper apical ring (7) is stuck in the gathering sill; Thrust ball bearing (10) is installed in the two sides of taper apical ring (7), and in the piston (11) of packing into then, screw b (15) compresses thrust ball bearing (10) by piston end cap (14); Piston (11) is packed into and is carried out axial location by piston end cap (14) among the body (9); Guide pad (13) is installed on the body (9) by screw b (12), is stuck in the groove of piston (11); Bulb push rod (6) and watt cover (19) are housed in three holes of axle sleeve (4), and watt cover (a 19) inwall is close to main shaft (5), and outer wall contacts with bulb push rod (6) inwall, composition spindle assemblies, spindle assemblies piston (11) inside of packing into; Taper apical ring (7) crown bar (6) sphere of trapping the ball; Between end cap (17) and the piston end cap (14) spring (2) is housed; Be equipped with between piston end cap (14) and the piston (11) and adjust packing ring (3); Sealing ring (18) is equipped with in cooperation place between piston (11) and the body (9).

2. a kind of gyroaxis as claimed in claim 1 is characterized in that with the precision crack positioner that disappears screw a (1) is installed on the end cap (17), as the lead of spring (2); End cap (17) is installed on the body (9) by screw d (16).