CN101832333B - Anti-impact dense ball static pressure proportion control mixing bearing - Google Patents

Abstract

The invention relates to an anti-impact dense ball static pressure proportion control mixing bearing. Because of the larger weight of a loaded workpiece, the bearing capacity of a spindle system of a large-size measurement instrument and machine tool is of particular importance when the large-size measurement instrument and machine tool carries out measurement or processing on the heavy loaded workpiece. The anti-impact dense ball static pressure proportion control mixing bearing comprises a base (1) which is provided with a spindle (2) and a static pressure ball platform (3), the spindle is sleeved with a shaft sleeve (4), the static pressure ball platform is provided with a rolling dense ball bearing (5) and a ball retainer (6), a space for loading hydraulic oil is reserved between the rolling dense ball bearing and the ball retainer, the lower end of the ball retainer is connected with a hydraulic oil feed hole (8), the upper end of the static pressure ball platform is connected with a turntable (9), and the turntable is connected with a pressure-bearing tray (10). In the invention, the anti-impact dense ball static pressure proportion control mixing bearing is used.

Description

Anti-impact dense ball static pressure proportion control mixing bearing

Technical field:

The present invention relates to a kind of measuring tool field, be specifically related to a kind of anti-impact dense ball static pressure proportion control mixing bearing.

Background technique:

Big specification surveying instrument and lathe are because loaded work piece weight is bigger, so the heavy load workpiece is being measured or added man-hour, the bearing capacity of its axis system is particularly important.Traditional main shaft end face carries liquid static-pressure support; The modes such as close pearl rolling sealed bead bearing supporting of rolling; But these single supporting meanss can not prevent well that promptly big load workpiece is when mounted to the impact of axis system; Can not reduce effectively again that the axis system end face carries the circularity distortion that close pearl rolling sealed bead bearing causes because of load when measuring state, thereby directly influence the axis system rotary precision.

Summary of the invention:

The purpose of this invention is to provide a kind of anti-impact dense ball static pressure proportion control mixing bearing that utilizes the box-like minimizing impact force of rolling sealed bead bearing, ball retainer and hydraulic oil spatial group.

The purpose of foregoing invention realizes through following technological scheme:

Anti-impact dense ball static pressure proportion control mixing bearing, its composition comprises: pedestal, described pedestal are equipped with main shaft and static pressure ball table; Described main shaft is with axle sleeve; Described static pressure ball table is equipped with rolling sealed bead bearing, ball retainer, leaves the space of dress hydraulic oil between described rolling sealed bead bearing and the ball retainer, and described ball retainer lower end connects the hydraulic oil oil inlet hole; Described static pressure ball table upper end connects turntable; Described turntable connects the pressure-bearing pallet, and close pearl retainer is housed between described main shaft and the axle sleeve, dress rolling sealed bead bearing in the described close pearl retainer.

Described anti-impact dense ball static pressure proportion control mixing bearing, described pedestal upper end have vertical connection horizontal to spill port.

Described anti-impact dense ball static pressure proportion control mixing bearing, the described static pressure ball table of the periphery of described ball retainer comprises hydraulic pressure hydrostatic support dish.

Described anti-impact dense ball static pressure proportion control mixing bearing, the hydraulic oil oil inlet hole of described ball retainer lower end is vertical, described vertical hydraulic oil oil inlet hole connection horizontal to the hydraulic oil oil inlet hole.

Described anti-impact dense ball static pressure proportion control mixing bearing is equipped with toply on the described pressure-bearing pallet, describedly the top center sleeve that is with, and described center sleeve has center hole.

Beneficial effect:

1. axis system end face of the present invention carries the weight that adopts close pearl of rolling and static pressure mixing bearing to carry workpiece, has played can be good at guaranteeing that axis system integrates the effect that prevents impact of heavy load workpiece and high-acruracy survey.

2. the present invention has designed two different flow controllers, is used for completion picking-up turntable when the load clamping and leaves close pearl together with pressure-bearing pallet and workpiece load, and the usefulness that power is carried the realization precision measuremnt is jointly upwards floated in close pearl and hydraulic pressure generation when the state of measurement again.

3. the impact of the present invention in order to prevent to adorn workpiece; At this moment the pressure-bearing pallet is gapped with the series close pearl that rolls together with turntable; Load-bearing W when the design work height of hydrostatic support leaves the close pearl height of rolling h1 at turntable; The pressure-bearing pallet can be controlled at h2 together with the liquid crack that turntable leaves steel ball before the dress workpiece, owing to receive impact force and deadweight, static pressure carried W when the height in hydrostatic support liquid crack was reduced to h1 gradually from leaving ball h2 when dress weight is the workpiece load of W;, promptly contact to zero from h1 with ball.At this moment the slit of flow reduces because the height of hydrostatic support reduces just, and it is big that rigidity becomes.

4. the present invention has changed single relatively supporting way; Adopting close pearl and static pressure mixing bearing axle system is that a kind of bearing capacity is big; The static-pressure shafting that measuring accuracy is high, the flimsy problem of close pearl in the close pearl rolling sealed bead bearing that rolls when especially well having solved existing axle and be component load-bearing than heavy industry spare.

5. loaded state of the present invention had both guaranteed the axial rotary precision of main shaft by the close pearl that rolls, carried most of load by hydraulic system again and make the close pearl rolling sealed bead bearing that rolls not fragile, had reached the purpose of mixing bearing.

6. the present invention adopts the anti-impact dense ball static pressure proportion mixing bearing, promptly plays the effect of protecting against shock, when measuring workpieces, has also born the most of weight of workpiece; Making axle, to be that the end face steel ball is stressed reduce; And can keep constant, and this is to improving precision, and improving axle is to have played decisive role working life.

7. the present invention adopts the design of anti-impact dense ball static pressure proportion mixing bearing; Owing to there is not a mechanical mechanism for lifting, the hydrostatic support dish is inboard puts the close pearl that rolls, promptly hydrostatic support and the close pearl layout of rolling in the instrument space same aspect position; Liquid has made full use of the space between close pearl; Making axle is that occupation space reduces significantly, has effectively utilized the space, makes it the global structure design and optimizes more.

8. be interference fit between rolling close pearl rolling sealed bead bearing of the present invention and main shaft and the axle sleeve, no gap, radially dynamic precision obtains strict guarantee when making motion of main shaft.

9. the close pearl rolling of the rolling sealed bead bearing together support load that static pressure liquid crack during of the present invention the measurement above the hydrostatic support dish and workpiece are retainer has realized precision measuremnt.

Description of drawings:

Fig. 1 is the structural drawing before the present invention adorns workpiece.

Fig. 2 is the structural drawing after the present invention adorns workpiece.

Embodiment of the present invention:

Embodiment 1:

Anti-impact dense ball static pressure proportion control mixing bearing; Its composition comprises: pedestal 1, described pedestal 1 are equipped with main shaft 2 and static pressure ball table 3, and described main shaft 2 is with axle sleeve 4; Described static pressure ball table 3 is equipped with rolling sealed bead bearing 5, ball retainer 6; Leave the space 7 of dress hydraulic oil between described rolling sealed bead bearing 5 and the ball retainer 6, described ball retainer 6 lower ends connect hydraulic oil oil inlet hole 8, and described static pressure ball table 3 upper ends connect turntable 9; Described turntable 9 connects pressure-bearing pallet 10, and described rolling sealed bead bearing has one group.

Described anti-impact dense ball static pressure proportion control mixing bearing is equipped with close pearl retainer 11 between described main shaft 2 and the axle sleeve 4, dress rolling sealed bead bearing 12 in the described close pearl retainer 11.

Described anti-impact dense ball static pressure proportion control mixing bearing, outer being trapped among of described ball retainer 6 is equipped with hydraulic pressure hydrostatic support dish 13 on the described static pressure ball table 3.

Described anti-impact dense ball static pressure proportion control mixing bearing is equipped with top 14, described top 14 and is with center sleeve 15 on the described pressure-bearing pallet 10, described center sleeve has center hole.

Described anti-impact dense ball static pressure proportion control mixing bearing is interference fit between described rolling sealed bead bearing and main shaft and the axle sleeve.

Embodiment 2:

According to embodiment's 1 described anti-impact dense ball static pressure proportion control mixing bearing, the hydraulic oil oil inlet hole that described ball retainer lower end connects is vertical, described vertical hydraulic oil oil inlet hole connection horizontal to the hydraulic oil oil inlet hole; Hydraulic system has multiple pressure and flow, and this drives oil hydraulic pump by variable-frequency motor and accomplishes.Different pressure is set up by the proportional control relief valve, before measuring or processing, as long as with workpiece weight input computer; Computer is given the proportional control valve command adapted thereto, and proportional control valve can be transferred to corresponding gear with pressure automatically, and what make that hydraulic pressure produces overcomes a part of weight (this buoyancy that makes progress vary in weight with workpiece and change) to buoyancy close pearl is stressed constant basically thereby end face rolls; W is a load weight; F be hydraulic pressure to buoyancy, the close bead that rolls is stressed for Q, Q=W-F; F changes with W, and Q is substantially invariable.

Embodiment 3:

According to embodiment's 1 described anti-impact dense ball static pressure proportion control mixing bearing, described pedestal upper end have vertical connection horizontal to spill port 16.

Embodiment 4:

According to embodiment's 1 described anti-impact dense ball static pressure proportion control mixing bearing; Described impact when preventing to adorn workpiece; At this moment the pressure-bearing pallet is gapped with the series close pearl that rolls together with turntable, and the design work height of hydrostatic support leaves load-bearing W when rolling close pearl height h1 at turntable, and the pressure-bearing pallet can be controlled at h2 together with the liquid crack that turntable leaves steel ball before the dress workpiece; Dress weight when being the workpiece load of W owing to receive impact force and deadweight; Static pressure carried W when the height in hydrostatic support liquid crack was reduced to h1 gradually from leaving ball h2,, promptly contacted with ball to zero from h1.At this moment the slit of flow reduces because the height of hydrostatic support reduces just, and it is big that rigidity becomes.

The rigidity formula is: $j=\underset{\mathrm{\Δ\; h}\→0}{\mathrm{Lin}}\frac{\mathrm{\Δ\; W}}{\mathrm{\Δ\; h}}=\frac{\mathrm{DW}}{\mathrm{Dh}}$

F: hydraulic pressure is to buoyancy, and Q: the close bead that rolls is stressed, Pr: oil pocket pressure, Ab: oil pocket useful area, Ps: charge oil pressure

Hydraulic pressure is when buoyancy is certain, and load W is big more, and oil slick thickness h is thin more, and oil pocket pressure P r is high more, and the hydraulic pressure of supporting is also big more to buoyancy F.

Working principle:

When workpiece is installed on the pallet clamping, pallet can along axle system radially on turntable contact slide, overlap with main shaft and top revolution shaft axis with adjustment workpiece geometrical axis.Turntable is rigidly connected through screw and main shaft indirectly.Be fixedly connected the worm and gear drive unit on the turntable, the rotation of driven by motor worm screw drives worm gear drives turntable and main shaft and rotates, and rotates thereby drive workpiece.Static pressure rolls and has oil clearance between close pearl rolling sealed bead bearing and the turntable, and hydrostatic support dish and matrix 11 constitute an airtight cavity that has return opening, before the installation workpiece; Owing to consider when workpiece falls main shaft had impact; Hydraulic system increases pressure, and through the hydraulic fluid flow rate increase of oil inlet hole, the capacity of hydraulic oil increases in the cavity at the close pearl rolling sealed bead bearing place of rolling; Make turntable drive main shaft and float oil slick thickness h2; At this moment, workpiece weight is all born by hydraulic system, and the close pearl rolling sealed bead bearing of avoiding rolling receives impact failure.After workpiece installs, change the force value of hydraulic system, make turntable fall back the height when workpiece is not installed, hydraulic system is born workpiece weight together with the close pearl rolling sealed bead bearing that rolls.

Claims (1)

1. a kind of anti-impact dense ball static pressure proportion control mixing bearing system; Its composition comprises: pedestal; It is characterized in that: described pedestal is equipped with main shaft and static pressure ball table, and described main shaft is with axle sleeve, and described static pressure ball table is equipped with rolling sealed bead bearing, ball retainer; Leave the space of dress hydraulic oil between described rolling sealed bead bearing and the ball retainer; Described ball retainer lower end connects the hydraulic oil oil inlet hole, and hydraulic system has multiple pressure and flow, and this drives oil hydraulic pump by variable-frequency motor and accomplishes; Different pressure is set up by the proportional control relief valve, before measuring or processing, as long as with workpiece weight input computer; Computer is given the proportional control valve command adapted thereto, and proportional control valve can be transferred to corresponding gear with pressure automatically, and what make the hydraulic pressure generation overcomes a part of weight to buoyancy; This buoyancy that makes progress varies in weight with workpiece and changes; Close pearl is stressed constant basically thereby end face rolls, and described static pressure ball table upper end connects turntable, and described turntable connects the pressure-bearing pallet; Close pearl retainer is housed, dress rolling sealed bead bearing in the described close pearl retainer between described main shaft and the axle sleeve; Described pedestal upper end have vertical connection horizontal to spill port; The described static pressure ball table of the periphery of described ball retainer comprises hydraulic pressure hydrostatic support dish; The hydraulic oil oil inlet hole of described ball retainer lower end is vertical, described vertical hydraulic oil oil inlet hole connection horizontal to the hydraulic oil oil inlet hole, be equipped with top on the described pressure-bearing pallet; The described top center sleeve that is with, described center sleeve has center hole.

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