CN2064048U

CN2064048U - Automatic hand-balanced gravity pendulum steelyard

Info

Publication number: CN2064048U
Application number: CN 90200464
Authority: CN
Inventors: 池洪
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-01-11
Filing date: 1990-01-11
Publication date: 1990-10-17

Abstract

The utility model discloses an automatic hand-balanced gravity pendulum steelyard, which is composed of a scale pan (3), tooth gear (4), racks (7), poise (1), etc. The racks (7) are arranged at the lower end of the scale pan (3), and the poise (1) is fixedly connected with the central shaft of the tooth gear (4) by a rod. When the scale pan (1) bears load, the racks (7) is pressed to the lower part and the tooth gear (4) is moved, the central shaft of the tooth gear (4) is rotated, so the poise (1) can be driven to move automatically, measure the value of moving, and automatically display the value; the weight of objects which is weighed can be obtained. The utility model has the advantages of simple structure, low cost, convenient portability, exact weighing, and difficult cheat (when cheating, no-load pointer can not return to zero), etc.

Description

Automatic hand-balanced gravity pendulum steelyard

The utility model belongs to field of measuring techniques, particularly a kind of self-poise gravity balance of weighed object body and function.

With the most approaching a kind of prior art of the utility model see applying date that Patent Office of the People's Republic of China accepts be 890919, application number is 89217250.9, name is called the application case of " self-poise gravity balance ".The self-poise of this self-poise gravity balance and automatic the demonstration by gear, tooth bar, cam drive realize.The title thallium is connected with the cam periphery by connection flexible steel sheet thereon, and during work, the cam rotation and the flexible steel sheet of reeling make to claim the thallium automatic shift to reach self balancing.Because this balance realizes by the coiling flexible steel sheet, thereby flexible steel sheet is longer during zero-bit, and the title thallium that plays by flexible steel sheet when carrying will be swung, thereby will be to a kind of unsettled sensation of people.The utility model is exactly that a kind of self-poise gravity fork of developing at above-mentioned situation claims, is a replacement demand case of above-mentioned prior art.

The utility model is made of pan of a steelyard ［ 3 ］, autobalance, straight device and the housing 12 etc. of showing of numeral.Autobalance is made up of gear 4, tooth bar 7, title thallium 1 etc.Gear 4 is installed on the bearing 10 at housing 12 two ends; Claim that thallium 1 is fixed on the outrigger shaft of gear 4 by thallium bar 2; Tooth bar 7 realizes that with gear 4 transmission cooperates by the restriction that is bearing in the guide wheel 8 on the housing 12, and housing 12 and pan of a steelyard 3 Joints are stretched out in its upper end.When leaving standstill, by the closing weight and thallium bar and claim the moment field that weight and gear centre point form of closing of thallium to reach balance of pan of a steelyard and tooth bar, the straight device that shows of numeral of establishing this moment is shown as zero.During weighing.The thing compressing tooth bar that claimed on the pan of a steelyard glides, and tooth bar downslide rubbing gear rotates, and gear drive drives fork and claims the thallium rotation.When claiming thallium to move to certain position, by claim thallium and thallium bar close weight and by closing of being formed by title thing, pan of a steelyard and the tooth bar moment field that weight forms by the central point of gear balance once again.According to principle of moment balance, the vertical range d that claims at this moment closing of thallium and thallium bar to arrive gear centre point in the residing position of weight only claims that with quilt thing weight is proportional, so can be by the residing position of weight claims thing to the also direct demonstration quilt of the vertical range d of gear centre point the weight of closing of numeral directly apparent device measurement title thallium and thallium bar.During actual the measurement, the measurement of fork angular displacement will be easy to many apart from the measurement of d, because thallium bar angular displacement is with existing certain mathematical relation between the d, if establish the thallium bar and claim that the center of gravity of closing of thallium is R to the distance at gear ［ 4 ］ center, d=Rsin θ then, because the length of thallium bar and claim that the shape of thallium is certain in advance, so the variation of d only has relation with the variation at θ angle.So, can be by measuring the weight that weighed object is measured at the θ angle.

The straight apparent device of the numeral corresponding with measuring the θ angle can have various ways, the one, carry out analog to digital conversion and mathematics manipulation then by the angular displacement that measures the thallium bar, send into digital display meter again and directly show it, this scheme can realize by an angular displacement sensor and mathematics manipulation circuit and digital display circuit; The 2nd, nonlinear thallium bar rotational angle theta is converted to linear the rotation with a sets of curves gear mesh, on dial, indicate gravimetric value with pointer then; The third form is converted to linear amount with a sine mechanism with nonlinear thallium bar rotational angle theta exactly, directly demonstrates alleged weight of heavy with pointer on dial.

Accompanying drawing one is specific embodiments of the present utility model with accompanying drawing two, the straight device that shows of its numeral adopts above-mentioned the third mode, promptly a driving lever 16 and one are housed on the outrigger shaft of gear 4 can be at the rotating disk 5 that freely rotates and on its body, be connected with pinion wheel on the axle, what cooperate with pinion wheel realization transmission on the rotating disk 5 is L shaped member 13, its one side is tooth bar, realize that with the pinion wheel on the rotating disk 5 transmission cooperates, be carved with chute on the another side, one end of driving lever 5 embeds in this groove, when gear 4 outrigger shafts rotate 16 rotations of drive driving lever, the other end of driving lever moves up and down in the chute of L shaped member 13, thereby impel L shaped member 13 move left and right on one side of tooth bar, the track of L shaped member 13 move left and right is subjected to being installed in the restriction of the little guide wheel in the wheel frame 15 on the shell holder 12.The move left and right of L shaped member drives rotating disk 5 and rotates thereupon.The radius that establish the pinion wheel on the rotating disk 5 this moment is r ₁, the length of driving lever is r, and the profile of tooth reticule of tooth bar 7 is e to the distance of center circle of central gear 4, and by the weight P of thing, if the angle of gear 4 transmissions is θ, the distance that L shaped member moves is a, and the angle that rotating disk 5 rotates is θ ₁, then have following mathematical expression to set up:

p·e＝G·d … … ① d＝Rsinθ … … ②

a＝rsinθ … … ③ a＝r ₁θ ₁… … ④

Will be 2./(d)/(a)=(R)/(r) a=(dR)/(r) 3. then ... 7.

1. 5. substitution gets: a=(pe)/(G) (R)/(r) ... 6.

4. 6. substitution gets: r ₁θ ₁=(pe)/(G) (R)/(r)

Be θ ₁=(eR)/(Grr ₁) p ... 7.

Since e, R, G, r, r ₁Be constant, so (eR)/(Grr ₁) be a constant also, be made as K, then θ=KP this shows that the angle that rotating disk 5 rotates only claims that with quilt the weight of thing is proportional.Both can directly on the central shaft of gear 4, adorn thus one with the pointer of rotating disk 5 servo-actuateds, also can drag a counter 6 and carry out weight and directly show by rotating disk 5.

Accompanying drawing three is another specific embodiments of the present utility model, it is characterized in that: straight-bar of above-mentioned tooth bar 7 usefulness 20 substitutes, be used to accept pan of a steelyard 3, central gear 4 can substitute with a cylinder drum 19, with a steel wire or steel pool 18 straight-bar and cylinder drum are coupled together then, to replace above-mentioned rack pinion transmission to cooperate, concrete connected mode is; Steel wire or steel pool 18 is fixed on the straight-bar 20 its two ends being tightened behind the pitch of the laps on the drum 19 again.Like this, when after putting weight 11 on the pan of a steelyard, steel wire or steel pool 18 move down under straight-bar 20 drags and rubbing cylinder drum 19 rotates, and swing thereby make with spool the thallium bar 2 and the thallium that connect firmly of cylinder drum 19.

Autobalance gravity bob steelyard according to the utility model manufacturing, not only possess the characteristics such as simple in structure, aesthetic in appearance, easy to carry, low price, but also have weighing accurately, be difficult for cheating (during cheating, unloaded pointer is with zero variation), the advantage such as with a high credibility, the scope of application is extensive.

Claims

1, a kind of by pan of a steelyard [3], autobalance, numeral is straight to show the automatic balance gravity swing link scale that device and housing [12] are constituted, and it is characterized in that: described autobalance is by gear [4], tooth bar [7], claims thallium compositions such as [1]; Gear [4] is installed on the bearing [10] at housing [12] two ends, claim thallium [1] to be fixed on the outrigger shaft of gear [4] by thallium bar [2], tooth bar [7] realizes that with gear [4] transmission cooperates by the restriction that is bearing in the guide wheel [8] on the housing [12], and housing [12] and pan of a steelyard [3] Joint are stretched out in its upper end.

2, automatic balance gravity swing link scale as claimed in claim 1, it is characterized in that: the available straight-bar of described tooth bar ［ 7 ］［ 20 ］ substitutes, again its two ends are tightened after cylinder drum ［ 19 ］ is gone up pitch of the laps with a steel wire or steel pool ［ 18 ］ then and be fixed on the straight-bar ［ 20 ］, thallium bar ［ 2 ］ and thallium are fixed on the axle of garden post drum ［ 19 ］.

3, as claim 1,2 described automatic balance gravity swing link scales is characterized in that: described numeral directly shows device and can be made up of the displacement transducer of measuring oscillating bar scale thallium displacement and mathematics manipulation circuit and number peace indicator gauge; Also can be formed by a sets of curves gear mesh and pointer display panel; Can also mechanical sinusoidal gear train on central gear ［ 4 ］ or cylinder drum ［ 19 ］ axle and pointer display panel be formed by being connected in.

4, as claim 1,2 described automatic balance gravity swing link scales, it is characterized in that: the sinusoidal gear train of described machinery is installed in driving lever ［ 16 ］ on gear ［ 4 ］ or cylinder drum ［ 19 ］ outrigger shaft and one by one and can be formed at the rotating disk ［ 5 ］ that freely rotates and be connected with pinion wheel on the axle on its body and a L shaped member ［ 13 ］ that is carved with chute and tooth bar respectively, one end of driving lever ［ 5 ］ embeds in the L shaped member chute on one side, the tooth bar of L shaped member ［ 13 ］ is to realize that with the pinion wheel of rotating disk ［ 5 ］ transmission cooperates on one side, is installed in that in the wheel frame ［ 15 ］ on the shell holder ［ 12 ］ little guide wheel ［ 17 ］ to be arranged be the angle sheave of L shaped member ［ 13 ］; Pointer show both can on the central shaft of gear ［ 4 ］ or cylinder drum ［ 19 ］, adorn one with the pointer of rotating disk ［ 5 ］ servo-actuated, also can drag a counter ［ 6 ］ and be realized by rotating disk ［ 5 ］.