CN202438848U - Mechanism for controlling swing of numerical control turntable for numerical control machine tool - Google Patents

Abstract

The utility model relates to the field of numerical control machine tools, discloses a mechanism for controlling swing of a numerical control turntable for a numerical control machine tool, and in particular suitable for a mechanism which is only required to push the numerical control turntable to swing within 100 degrees on the numerical control machine tool. By the mechanism, a cross-shaped slide block mechanism is adopted to drive the numerical control turntable to rotate in a rotating angle of less than 100 degrees around the center O of the numerical control turntable; and moreover, the mechanism is simple in structure, practical and reliable, the torque fluctuation acting on a rotary worktable is slight, and similar drive is more stable than the fluctuation.

Description

A kind of mechanism that is used for the control numerical control rotating platform swing of Digit Control Machine Tool

Technical field

The utility model relates to the Digit Control Machine Tool field, is particularly suitable for only requiring on the Digit Control Machine Tool mechanism that promotes numerical control rotating platform swing in 100 degree.

Background technology

In the design of Digit Control Machine Tool; Require us to be controlled at the rotary table that rotates in 100 ° of scopes sometimes, if adopt worm gear or gear drive, because worm gear or gear are all gapped; Must adopt the mechanism of twin worm or bidentate wheel drive to eliminate the gap, cost is very high.We have proposed a kind ofly to promote this rotary table with connecting rod in CN 101508039B utility model patent, and an end of connecting rod links to each other with slide block on the guide rail through hinge, and the other end passes through hinge and links to each other with rotary table.When slide block when guide rail moves in the dynamic action lower edge, slide block promotes the rotary table revolution through connecting rod.If slide block is F along the active force of guide rail, it is Fcos β along the component of connecting rod direction, and the arm of force is that (θ+β), connecting rod promotes the moment of rotary table to Rcos

M＝FRcosβcos(θ+β)

It is a variable.Particularly when 90 ° of θ+β ≈, moment is very little, pushes away motionless rotary table, will avoid this situation in the design.Can also know by Fig. 2:

$\sin \mathrm{\β}=\frac{H-R\cos \mathrm{\β}}{L}$

x＝Rsinθ+Lcosβ

$\frac{\mathrm{dx}}{\mathrm{d\θ}}=\frac{R\cos (\mathrm{\θ}+\mathrm{\β})}{\cos \mathrm{\β}}$

represented the similar gearratio of this mechanism, can be known that by following formula the amplitude of variation is very big.

The utility model content

The purpose of the utility model is; Do not need 360 degree revolutions and only do local swing in order to overcome existing part numerical control rotating platform, still adopt worm gear or gear pair to control, not only cost is high; And sideshake is difficult to the defective of elimination; The utility model aims to provide a kind of mechanism of the control numerical control rotating platform swing that is used for Digit Control Machine Tool, and this mechanism adopts one " ten " word slide block mechanism to drive numerical control rotating platform winding number control turntable center O and rotates angle less than the rotation of 100 degree, and simple in structure, practical, reliably; The torque fluctuations that acts on rotary table is little, and similar gearratio fluctuation steadily.

To achieve these goals; The technical scheme that the utility model adopted is: a kind of mechanism that is used for the control numerical control rotating platform swing of Digit Control Machine Tool; Comprise the numerical control rotating platform that is contained on the lathe bed; Lathe bed is provided with and promotes " ten " word slide unit that numerical control rotating platform rotates, and should comprise X axle slide unit and Y axle slide unit by " ten " word slide unit, and lathe bed is provided with the X axis rail; X axle slide unit is contained on the X axis rail and X axle slide unit can move at power drive lower edge X axis rail; X axle slide unit is provided with the Y axis rail vertical with the X axis rail, said Y axle slide unit be contained on the Y axis rail and can along the Y axis rail move and Y axle slide unit hinged with numerical control rotating platform through hinge, said Y axle slide unit can move and promotes the center rotation of numerical control rotating platform winding number control turntable through hinge along with X axle slide unit.

Screw mandrel is installed in said X axle slide unit bottom.

By said structure, when the downward thrust F of slide block was constant, the moment that is added on the numerical control rotating platform did

M＝FRcosθ

The mobility scale of moment is FRcos50 ° → FR → FRcos50 °, and moment is maximum during θ=0 °, and M=FR fluctuates between 0.65FR～FR.X axle slide unit promotes through screw mandrel; If the pitch of screw mandrel is t; When screw mandrel revolution Δ Θ radian, the screw mandrel stroke is

because x=Rsin θ

$\frac{\mathrm{\Δx}}{\mathrm{\Δ\θ}}=\frac{\mathrm{\Δ\Θ}}{\mathrm{\Δ\θ}}\frac{t}{2\mathrm{\π}}=R\cos \mathrm{\θ}$

Can try to achieve the rotating similar gearratio of disk is:

$J=\frac{\mathrm{\Δ\Θ}}{\mathrm{\Δ\θ}}=\frac{2\mathrm{\πR}}{t}\cos \mathrm{\θ}$

Gearratio was maximum when the excursion of gearratio was

θ=0 °, also fluctuation between 0.65～1.

If the power of motor is N (Nm), it is 2 π N that motor returns the merit of being done that circles, and the thrust of establishing screw mandrel is F, and then Ft=2 π N, so screw mandrel thrust does

$F=\frac{2\mathrm{\πN}}{t}$

Compared with prior art, the beneficial effect of the utility model is: the driving torque fluctuation range is little, and similar gearratio changes little; And simple in structure, stroke weak point, good rigidly, cost are low, do not have sideshake, are particularly suitable for only requiring the numerical control rotating platform that promotes numerical control rotating platform rotation in 100 degree.

Description of drawings

Fig. 1 is the structural representation of a kind of embodiment of the utility model;

Fig. 2 is the prior art constructions schematic diagram;

In Fig. 1

The 1-lathe bed; The 2-numerical control rotating platform; The 3-hinge; The 4-X axis rail;

5-X axle slide unit; The 6-Y axis rail; 7-Y axle slide unit;

The centre of gyration of O-numerical control rotating platform 2; The F-slide block is along the active force of guide rail;

The radius of gyration of R-numerical control rotating platform 2;

The angle of the θ-hinge and the centre of gyration and horizontal direction;

In Fig. 2

The angle of the θ-hinge and the centre of gyration and horizontal direction.

The angle of β-push rod and X axis rail direction;

The L-push rod length;

Distance between the H-centre of gyration and the X slide block movement direction;

Distance between the x-centre of gyration and the X axle slide unit.

The specific embodiment

As shown in Figure 1; A kind of mechanism that is used for the control numerical control rotating platform swing of Digit Control Machine Tool; Comprise the numerical control rotating platform 2 that is contained on the lathe bed 1; Lathe bed 1 is provided with and promotes " ten " word slide unit that numerical control rotating platform rotates, and should comprise X axle slide unit 5 and Y axle slide unit 7 by " ten " word slide unit, and lathe bed 1 is provided with X axis rail 4; X axle slide unit 5 is contained on the X axis rail 4 and X axle slide unit 5 can move by X axis rail 4 in the power drive lower edge; X axle slide unit 5 is provided with the Y axis rail 6 vertical with the X axis rail, said Y axle slide unit 7 be contained on the Y axis rail 6 and can along Y axis rail 5 move and Y axle slide unit 7 hinged with numerical control rotating platform 2 through hinge 3, said Y axle slide unit 7 can rotate along with X axle slide unit 5 move and promote numerical control rotating platforms 2 winding number control turntables 2 centers through hinge 3.

Screw mandrel is installed in X axle slide unit 5 bottoms; X axle slide unit 5 can move under the effect of servomotor and screw mandrel; The gyroaxis of numerical control rotating platform 2 is provided with the grating measurement element, measures the actual rotational angle of numerical control rotating platform 2 and constitutes closed-loop system with servomotor, reaches our needed precision.

Claims (2)

1. the mechanism of a control numerical control rotating platform swing that is used for Digit Control Machine Tool; Comprise the numerical control rotating platform (2) that is contained on the lathe bed (1); It is characterized in that; Lathe bed (1) is provided with and promotes " ten " word slide unit that numerical control rotating platform rotates, and should comprise X axle slide unit (5) and Y axle slide unit (7) by " ten " word slide unit, and lathe bed (1) is provided with X axis rail (4); X axle slide unit (5) is contained on the X axis rail (4) and X axle slide unit (5) can move by X axis rail (4) in the power drive lower edge; X axle slide unit (5) is provided with the Y axis rail (6) vertical with the X axis rail, said Y axle slide unit (7) be contained in that Y axis rail (6) is gone up and can along Y axis rail (5) move and Y axle slide unit (7) hinged with numerical control rotating platform (2) through hinge (3), said Y axle slide unit (7) can rotate along with X axle slide unit (5) moves and promotes numerical control rotating platform (2) winding number control turntable (2) center through hinge (3).

2. according to the said mechanism that is used for the control numerical control rotating platform swing of Digit Control Machine Tool of claim 1, it is characterized in that screw mandrel is installed in said X axle slide unit (5) bottom.

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