CN2781088Y - Low secondary geneva mechanism - Google Patents

Abstract

The utility model relates to a fully-lower pair grooved pulley mechanism which is composed of a grooved pulley, a shifting pin and a drive plate, wherein radial grooved pulley grooves are arranged on the grooved pulley in an equidistant mode. The utility model is characterized in that the grooved pulley, the drive plate and a guide groove are respectively fixed on a frame. The middle of the shifting pin is rectangular, and four corners of both ends are in circular arc shapes. The upper side and the lower side of the grooved pulley groove are expended to form an angle through which the shifting pin can easily enter and come out the groove, and the angle is set. Chamfering is positioned at the entering groove angle of the grooved pulley groove. The directional groove is arranged correspondingly to an opening of the grooved pulley groove. The drive plate is connected with the shifting pin and enters and comes out the grooved pulley groove along the guide groove to drive the grooved pulley to operate. All the contact parts of the shifting pin and the grooved pulley groove are in surface contact. The mechanism changes the shape of the shifting pin and causes the shifting pin and a connection pair of the grooved wheel groove to be both changed into low pair structures. The upper side and the lower side of the grooved pulley groove are expended to form the angle through which the shifting pin can easily enter and come out the groove, and the angle is set. The utility model prevents the shifting pin from being interfered when the shifting pin enters and comes out the groove. The utility model reduces the contact stress, improves the strength of the contact fatigue resistance, and effectively solves the problem that the is easy to corrode and damage under the conditions of low speed and heavy load, and the service life is prolonged.

Description

Fully-lower pair grooved pulley mechanism

Technical field

The utility model relates to the driving mechanism in a kind of Glassware compact system, particularly a kind of fully-lower pair grooved pulley mechanism.

Background technique

At present, in the Glassware press, the host work platform indexing mechanism that adopts is commonly Geneva mechanism both at home and abroad.The foundation 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 acceleration 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 dynamic property 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 operating 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 quenching with Subsequent tempering.Because the worktable quality fixed with sheave is big, moment of inertia is very big, sheave and finger are all bearing very big alternating stress, the Glassware press must turn round again in 24 hours continuously simultaneously, turning round, pitting corrosion will appear in sheave after three months, influence is normal to be used, and therefore its application area 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 alternating stress that bears mutually, but existed square finger to go into, go out the problem that the sheave groove is interfered.

The model utility content

The purpose of this utility model is to overcome above-mentioned deficiency, and 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 technological scheme that the utility model adopted is for achieving the above object:

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, guiding groove 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; Guiding groove corresponding groove race opening is provided with, and dial connects finger along the moving sheave running of guiding groove turnover sheave troughed belt; Each position that finger contacts with the sheave groove is the face contact.

Described sheave groove two ends are circular-arc for four jiaos, all are that lower pair connects between finger and the sheave.

The utility model has the advantages that: 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 working life and the expanded application scope of Geneva mechanism.

Description of drawings

Fig. 1 is the utility model overall structure schematic representation;

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

Embodiment

Below in conjunction with accompanying drawing and preferred embodiment, details are as follows to embodiment, structure, feature that foundation the utility model provides:

As shown in Figure 1, the utility model 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, guiding groove 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 settings of guiding groove 4 corresponding groove races, dial 5 connect finger 2 and drive sheave 1 running along guiding groove 4 turnover sheave grooves 3; Each position that finger 2 contacts with sheave groove 3 is the face contact.

Described sheave groove 3 two ends are circular-arc for four jiaos, all are that lower pair connects between finger 2 and the sheave 1.

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 alternating 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 circular arc part 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 circular arc part 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 circular-arc that the latter half of and inner side surface of finger outer side surface latter half of all is made as.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, guiding groove is set for guaranteeing finger.

In the regular troughs wheel mechanism, square finger is being gone into, will moved interference with sheave when going out groove.Upper side each point movement locus is a circular arc when avoiding finger going into, moving when going out groove interference, at first analyzing square finger going into groove, now the upper side opened with certain angle of sheave groove to contain its fortune track.In like manner, also opened with certain angle of sheave groove downside.So just can make square finger go into, go out groove smoothly.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.

Because the utility model 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 radius of arc is less, guarantees that arc section goes into, goes out groove and do not interfere, and has overcome the drawback that square finger exists.In addition, go into groove smoothly, added guiding groove 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 center line of radial groove 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 impulse when going into groove.So far, the finger movement interference and the rigid impulse problem of going into, moving back groove thoroughly solves.

Lower pair grooved pulley mechanism mainly is to propose at the operating conditions of low-speed heave-load.Under this operating conditions, the worktable quality is bigger, also is that the sheave gyration center is bigger to the centre distance of finger gyration center in the Geneva mechanism.Shown in the suitable centre distance scope of design diagram be 200～550mm.

As the centre distance a of Geneva mechanism, after groove is counted z and is determined, can by $r=a\×\sin \left(\frac{\mathrm{\π}}{z}\right),$ 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 abscissa with L, and corresponding y coordinate is dmin on the curve.

Single finger shown in the table, outer gearing 6,8,10,12 and 16 grooves

The design parameter of fully-lower pair grooved pulley mechanism

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

Design the groove of a sheave and count Z=10, centre distance a=500mm, then $r=a\×\sin \left(\frac{\mathrm{\π}}{10}\right)\≈154.5\mathrm{mm}.$ In the chart of Z=10, the value of r=154.5mm approaches r+r ₂The curve of=175mm is so determine r ₂=175mm-154.5mm=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 minimum range.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, guiding groove 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; Guiding groove corresponding groove race opening is provided with, and dial connects finger along the moving sheave running of guiding groove 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 described sheave groove two ends are circular-arc for four jiaos, all is that lower pair connects between finger and the sheave.

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