CN1654383A - Fully-lower pair grooved pulley mechanism - Google Patents

Abstract

The low subsidiary grooved pulley mechanism consists of grooved pulley, shift pin and shift disc. The grooved pulley has radial grooves in equal intervals, and the present invention features that the grooved pulley, shift disc and the guide groove are fixed onto the frame separately. The shift pin has rectangular middle part and circular corners in two ends; each of the grooves in the grooved pulley has expanded upper and lower sides for the shift pin to access fluently and rounded inlet; the guide grooves are set corresponding to the opening of the grooves in the grooved pulley; and the shift disc connected to the shift pin is inserted into the grooves to drive the grooved pulley. The present invention has greatly reduced contact stress between the shift pin and the grooved pulley, raised anti-fatigue strength, less spot corrosion and prolonged service life.

Description

Fully-lower pair grooved pulley mechanism

Technical field

The present invention relates to the transmission rig in a kind of glassware compact system, particularly a kind of fully-lower pair grooved pulley mechanism.

Background technology

At present, in the glassware press, the host work platform indexing mechanism that adopts is commonly Geneva mechanism both at home and abroad.The basic component of host work platform is a base, and gin pole is fixed on base central authorities, and on gin pole, the rotating disk bottom is the Geneva mechanism of sealing to the worktable rotating disk by bearings, rotates to drive worktable.Characteristics such as Geneva mechanism has simple structure, makes easily, reliable operation and mechanical efficiency height.But there is following shortcoming in the regular troughs wheel mechanism:

1, the regular troughs wheel mechanism is gone into out sheave groove moment at finger, and the sheave angular aceeleration is undergone mutation, and the Geneva mechanism load that withstands shocks, and along with the minimizing of the increase of rotating speed and groove number and aggravate so kinematic behavior is poor, is unsuitable for and runs up.

2, the kinematic coefficient k of Geneva mechanism and groove number have definite relation, after the groove number is determined, and kinematic coefficient k Hobson's choice.To count z be the increase of worktable station number and reducing to the static coefficient k of sheave and worktable along with groove.In actual applications, as want to enhance productivity, just should reduce static coefficient k, but adopt the regular troughs wheel mechanism, it is immutable after definite that static coefficient k is counted z when groove.

3, the regular troughs wheel mechanism belongs to higher pair mechanism, and finger is that line contacts with sheave, and under the low-speed heave-load working conditions, contact stress is big.

The following problem of normal appearance in actual operation: the material of sheave generally adopts spheroidal graphite cast iron usually, and the material of finger is 45 in the Geneva mechanism ^#Steel, and through modifier treatment.Because the worktable quality fixed with sheave is big, moment of inertia is very big, sheave and finger are all bearing very big repeated stress, the necessary again 24 hours continuous operation of while glassware press, turning round, pitting corrosion will appear in sheave after three months, influence is normal to be used, and therefore its range of application is limited to.If change existing cylindrical finger into square finger, though making square finger be contacted by line with sheave, this design becomes the face contact, promptly the higher pair mechanism of regular troughs wheel mechanism is become low counter gear, reduce the repeated stress that bears mutually, but existed square finger to go into, go out the problem that the sheave groove is interfered.

Summary of the invention

The objective of the invention is to overcome above-mentioned weak point, emphasis solves the difficult problem of the easy pitting corrosion of sheave under the low-speed heave-load situation, and a kind of fully-lower pair grooved pulley mechanism is provided.

The technical solution adopted in the present invention is for achieving the above object: a kind of fully-lower pair grooved pulley mechanism, constituted by sheave, finger, dial, and equidistantly be provided with the sheave groove on the sheave, it is characterized in that being provided with sheave, dial, guide path and be individually fixed on the frame; The finger middle part that is provided with is rectangle, and two ends are circular-arc for four jiaos; The upper and lower side of setting slot race should be opened and be made the finger motion go into, go out the angle of groove smoothly, and the sheave groove is gone into groove angle place rounding; Guide path corresponding groove race opening part is provided with, and dial connects finger along the moving sheave running of guide path turnover sheave troughed belt; Each position that finger contacts with the sheave groove is the face contact.

Advantage of the present invention is: this mechanism changes the shape of finger, making itself and sheave groove all is low auxiliary structure, the upper and lower side of setting slot race should open that to make finger motion go into, go out the angle of groove smoothly and go into the groove angle place be fillet, avoiding finger to go into, go out groove is interfered, reduce contact stress greatly, significantly improve anti-contact fatigue strength, effectively solve the difficult problem of the easy pitting corrosion of sheave under the low-speed heave-load, thereby improve the work-ing life and the expanded application scope of Geneva mechanism.

Description of drawings

Fig. 1 is an one-piece construction synoptic diagram of the present invention;

Fig. 2 goes into, goes out groove motion fit structure synoptic diagram for square finger and sheave groove;

Fig. 3 goes into, goes out groove motion fit structure synoptic diagram for finger and sheave groove among the present invention.

Among the figure: 1 sheave, 2 fingers, 3 sheave grooves, 4 guide paths, 5 dials.

Embodiment

Below in conjunction with accompanying drawing and preferred embodiment, to according to embodiment provided by the invention, structure, details are as follows for feature:

As Fig. 1～shown in Figure 3, the present invention is made of sheave 1, finger 2, dial 5, equidistantly is provided with sheave groove 3 on the sheave 1, it is characterized in that being provided with sheave 1, dial 5, guide path 4 and is individually fixed on the frame; Finger 2 middle parts that are provided with are rectangle, and two ends are circular-arc for four jiaos; Setting slot race 3 upper and lower sides should be opened and be made the finger motion go into, go out the angle of groove smoothly, and sheave groove 3 is gone into groove angle place rounding; The 3 opening part settings of guide path 4 corresponding groove races, dial 5 connect finger 2 and drive sheave 1 running along guide path 4 turnover sheave grooves 3; Each position that finger 2 contacts with sheave groove 3 is the face contact.

Concrete analysis as can be seen, in the enforcement if change existing cylindrical finger into square finger, become the face contact though square finger and sheave groove are contacted by line, reduced the repeated stress that bears mutually, but existed square finger to go into, go out the problem that the sheave groove is subject to interfere.For making finger go into, go out groove smoothly, further the finger front end is made as circular-arcly, the rear end is square, and the last circulation of this finger is the arc sections of front end, and one circulation becomes the rear end to the back, and last circulation is the square department of rear end, and one circulates and becomes front end to the back.For making finger go into groove smoothly, therefore after finger goes out groove, be recycled into before the groove to next must the solution finger " tune " problem.Making the arc sections of finger is front end in last circulation, and one circulation also is a front end to the back.This just needs to increase the design indexing mechanism, but limit by the space, makes its structure complicated, is difficult to realize.Be to solve the problem of finger " tune ", it is the center of circle that the latter half of and medial surface of finger outer side latter half of all is made as with the finger center of turning circle, O ₂A is the circular-arc of radius.The finger middle part that promptly is provided with is rectangle, and two ends are circular-arc for four jiaos; The finger of symmetric design structure is readily solved finger tune problem.Simultaneously, go into out the sheave groove smoothly, guide path is set for guaranteeing finger.

In the regular troughs wheel mechanism, square finger is being gone into, will moved interference with sheave when moving back groove.Upper side each point movement locus is with O when avoiding finger going into, moving when going out groove interference, at first analyzing square finger going into groove ₂Be the center of circle, the circular arc of different radii is wherein with the moving radius maximum of outer side sinciput point A.Now the upper side opened with certain angle of sheave groove is transported track to contain it.In like manner, also opened with certain angle of sheave groove downside.So just can make square finger go into, go out groove smoothly.Much angles should be opened as shown in Figure 2 in the upper and lower side of sheave groove, if the groove upper side is the subtended angle starting point with the B point, opening the minimum angles position is BD, and the arc of movement that BD and A are ordered is tangent, and the point of contact is the C point.As long as groove upper side opening angle is greater than this angle, square finger just can be gone into groove smoothly.In like manner, the minimum open-angle of groove downside also herewith so that square finger goes out groove smoothly.

Where the starting point of groove open-angle should be analyzed as follows: as shown in Figure 2, the upper and lower side of groove opened with certain angle, upper side subtended angle starting point are the B point.Finger is gone into groove to the position 1 ' time, and the medullary ray of radial slot is cut in the motion circumference at finger center.But this moment, finger contact with groove, and when continuing to move to position 2 ', finger downside E point ability contacts with the groove downside.At this moment the finger center moves to O by the O point ₃The point.Promptly contact moment at finger with groove, do not satisfied that the finger that proposes in the Geneva mechanism begins to enter radial slot and when radial slot was deviate from, the medullary ray of radial slot should be cut in the condition of finger central motion circumference, sheave speed has sudden change like this, will cause rigid shock.So groove upper side subtended angle starting point is improper at the B point.As shown in Figure 3, finger moves in going into the groove position, and the medullary ray of radial slot is cut in the motion circumference at finger center, and the preceding summit of finger outer side is the A point.Groove upper side subtended angle starting point is just opened and is being overlapped the place with the A point, and groove opens minimum position AB, and the arc of movement that AB and A are ordered is tangent, and the point of contact is the A point.In like manner, the groove downside also opens respective angles in the corresponding position, to satisfy the requirement that finger moves back groove.

Because the present invention has improved the shape of finger, as shown in Figure 1, the finger middle part is a rectangle, and two ends add the circular arc guiding, and arc radius is less than O ₂A guarantees that arc section goes into, moves back groove and do not interfere, and has overcome the drawback that square finger exists.In addition, go into groove smoothly, added guide path shown in Figure 1 in order to ensure finger.The structure of the opening angle of sheave groove in addition again, when finger moves to into the groove position, all contact, and the medullary ray of radial slot should be cut in the condition of finger central motion circumference when satisfying into groove with the upper and lower side of groove, sheave speed is sudden change not, does not have rigid shock when going into groove.So far, the finger movement interference and the rigid shock problem of going into, moving back groove thoroughly solves.

Groove subtended angle size is relevant with which factor under making a concrete analysis of below again, and provides calculation formula.If the straight line segment length of finger is 2L, the wide 2r of finger ₂, the turning radius at finger center is r, the groove number of sheave is Z, sheave center of turning circle O ₁To dial center of turning circle O ₂Width between centers be a.The angle and the sheave structural relation formula that make the finger motion go into, go out groove smoothly should be opened in the upper and lower side of sheave groove:

$r=a\×\sin \left(\frac{\mathrm{\π}}{Z}\right).$

Among Fig. 3, AC=L, O ₂C=r+r ₂,

$\mathrm{BC}=\frac{{\mathrm{AC}}^2}{O_{2}C}=\frac{L^2}{r+{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="A20051001310900081.png,A20051001310900091.png"\; state="\{\{state\}\}">r</figure-callout>}}_2}=\frac{L^2}{a\&times;\sin \left(\frac{\mathrm{\&pi;}}{Z}\right)+{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="A20051001310900081.png,A20051001310900091.png"\; state="\{\{state\}\}">r</figure-callout>}}_2}$

$d_{\min }=\mathrm{BC}=\frac{L^2}{a\&times;\sin \left(\frac{\mathrm{\&pi;}}{Z}\right)+{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="A20051001310900081.png,A20051001310900091.png"\; state="\{\{state\}\}">r</figure-callout>}}_2}$

The length that the notch place is revised is AC=L, and the minimum value of the width of correction is dmin.And that the groove of dmin and Geneva mechanism is counted wide four factors of straight line segment length, finger of z, width between centers a and finger is relevant.Much angles should be opened as shown in Figure 3 in the upper and lower side of sheave groove, if the groove upper side is the subtended angle starting point with the B point, opening the minimum angles position is BD, and the arc of movement that BD and A are ordered is tangent, and the point of contact is the C point.As long as groove upper side opening angle is greater than this angle, square finger just can be gone into groove smoothly.In like manner, the minimum open-angle of groove downside also herewith so that finger goes out groove smoothly.

Lower pair grooved pulley mechanism mainly is to propose at the working conditions of low-speed heave-load.Under this working conditions, the worktable quality is bigger, also is that the sheave center of turning circle is bigger to the width between centers of finger center of turning circle in the Geneva mechanism.Shown in the suitable width between centers scope of design chart be 200～550mm.

As the width between centers a of Geneva mechanism, after groove is counted z and is determined, can by $r=a\&times;\sin \left(\frac{\mathrm{\&pi;}}{Z}\right),$ Calculate r, in chart, find out r+r then near the r value ₂Curve can be determined groove width 2r then ₂The straight line segment length who selects pin again is 2L, is X-coordinate with L, and corresponding ordinate zou is dmin on the curve.

The design variable of single finger shown in the table, external toothing 6,8,10,12 and 16 groove fully-lower pair grooved pulley mechanisms

The station number	?θ 0	?θ 0/360°	???(ω 2/ω 1) max		????(α/ω 1 2) max		Sheave
									Protruding	Groove	Protruding	Groove	α 20/ω 1 2	α 20/α 2ma
			?Z＝6	?120°	??0.333	0.75	?1	1.6875							1.3496	0.5774	0.4278
?Z＝8	?135°	??0.375							0.5	?0.6199	1	0.6998	0.4142	0.5919
			?Z＝10	?144°	??0.4	0.375	?0.4472	0.703125							0.4648	0.3249	0.6987
?Z＝12	?150°	??0.41667							0.3	?0.3492	0.54	0.3477	0.2649	0.7707
			?Z＝16	?157.5°	??0.4375	0.1071	?0.2424	0.3673469							0.2323	0.1989	0.8561

Fully-lower pair grooved pulley mechanism design chart applicating example:

Design the groove of a sheave and count Z=10, width between centers a=500mm, then $r=a\&times;\sin \left(\frac{\mathrm{\&pi;}}{10}\right)\&ap;154.5\mathrm{mm}.$ In the chart of Z=10, the value of r=154.5mm approaches r+r ₂The curve of=175mm is so determine r ₂=175-154.5=20.5mm, groove width is 2r ₂=43mm.The straight line segment length who chooses finger again is 2L=40mm.By the chart of Z=10, at r+r ₂On the curve of=175mm, when L=20mm, dmin=2.1mm.Gained result like this: the length of square finger is 40mm, and wide is 43mm, and the correction length of sheave notch is 20mm, and it is 2.1mm that groove opens minor increment.Can guarantee that finger goes into, moves back groove smoothly.

Claims (2)

1, a kind of fully-lower pair grooved pulley mechanism is made of sheave, finger, dial, equidistantly is provided with the sheave groove on the sheave, it is characterized in that being provided with sheave, dial, guide path and is individually fixed on the frame; The finger middle part that is provided with is rectangle, and two ends are circular-arc for four jiaos; The upper and lower side of setting slot race should be opened and be made the finger motion go into, go out the angle of groove smoothly, and the sheave groove is gone into groove angle place rounding; Guide path corresponding groove race opening part is provided with, and dial connects finger along the moving sheave running of guide path turnover sheave troughed belt; Each position that finger contacts with the sheave groove is the face contact.

2, fully-lower pair grooved pulley mechanism according to claim 1 is characterized in that the upper and lower side of described sheave groove should open the angle and the sheave structural relation formula that make finger motion go into, go out groove smoothly and be:

$r=a\&times;\sin \left(\frac{\mathrm{\&pi;}}{Z}\right).$

AC＝L，O ₂C＝r+r ₂，

$\frac{\mathrm{AC}}{O_{2}C}=\frac{\mathrm{BC}}{\mathrm{AC}},$

$\mathrm{BC}=\frac{{\mathrm{AC}}^2}{O_{2}C}=\frac{L^2}{r+r_2}=\frac{L^2}{a\&times;\sin \left(\frac{\mathrm{\&pi;}}{z}\right)+r_2}$

$d_{\min }=\mathrm{BC}=\frac{L^2}{a\&times;\sin \left(\frac{\mathrm{\&pi;}}{z}\right)+r_2}$

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