CN2239019Y - Moment balance type automatic steelyard - Google Patents

Abstract

The utility model relates to a moment of force balance type balance, belonging to the technical field a mechanical weighing apparatus. The utility model is characterized in that a perpendicular rack bar with teeth is fixed at the central point under a scale pan, the teeth of the rack bar are engaged with a gear, a connecting rod is connected with the gear, a balance weight is fixed on the other end of the connecting rod, the C point of the connecting rod is connected with the upper rod of a T-shaped frame with the rack bar and breadthways arranged through a pin, the teeth of the rack bar of the T-shaped frame are engaged with a small gear with a pointer, and a concentric dial scale is fixed under the small gear. The utility model has the advantages of simple structure, convenient operation, and high measuring precision.

Description

Moment-equilibrium equation claims automatically

The utility model relates to a kind of moment-equilibrium equation and claims, belongs to mechanical equalizer technology field.

The principle of table scale is an equalising torque, is still generally using commercial at present, and table scale claims with common spring balance weighing error little than thick stick, weighing degree of accuracy height, and its cost is more much lower than electronic scale.But existing table scale exists outstanding shortcoming, i.e. an inconvenient operation.

The purpose of this utility model is, remedies the deficiency of prior art, provides a kind of moment-equilibrium equation to claim automatically.

The purpose of this utility model is achieved by the following technical solution.

The utility model moment-equilibrium equation automatically claims to be made up of the T-bar of the gear of the pan of a steelyard of band tooth bar, band balance bob, band tooth bar and the pinion wheel that is fixed with the band pointer of index dial.The concrete connection is: the toothed vertical tooth rack 2 of a side is fixed in the center below the pan of a steelyard 1, the tooth of tooth bar and a gear 3 engagements, this gear is connected to a connecting rod 9, the other end of connecting rod 9 is fixed a balance bob 4, the C point of connecting rod 9 connects on T-bar 5 upper booms of a horizontal band tooth bar by pin, fix a concentric index dial 8 below pinion wheel 6 engagements of the tooth of T-bar tooth bar and a band pointer 7, pinion wheel.

Above-mentioned index dial can be a disk, also can be annulus; Balance bob is manufactured with metal material, and remaining part can be chosen the material of certain wearing quality and fastness wantonly.

The course of work of the present utility model is as follows: will be claimed thing to put into pan of a steelyard 1, claimed the weight of thing to act on gear 3 downwards by tooth bar 2, the swing of 4 inverse times is hammered in the rotating band transient equilibrium of gear inverse time into shape, balance bob drives pinion wheel 6 by T-bar 5 and rotates, thereby makes the pointer 7 on the pinion wheel indicate the quality that is claimed thing on index dial.For the corner that guarantees pointer is directly proportional with the quality that is claimed thing, gearing designs according to sine principle, and the displacement of toothed T-bar is directly proportional with the quality that is claimed thing.If claimed that the acting force of thing is that F acts on the A point, the center of gravity of balance bob is G in the B point mass, is connected with balance bob at C point T-bar, and T-bar can only left and right sides translation, distance is 1 if T-bar leaves initial position, and the angle that balance bob rotates with respect to the original position is θ.Know according to equalising torque formula and sine principle: FOA=GOBSin θ 1.

1=OCSin θ is 2. by 1. 2. knowing $l=\frac{\mathrm{OA}\·\mathrm{OC}}{\mathrm{OB}\·G}F$ Because the coefficient before the F is certain for the title of a certain model, 1 is directly proportional with F, i.e. the displacement of T-bar is that its quality is directly proportional with the acting force that is claimed thing, has just guaranteed that also the corner of pinion wheel is directly proportional with the quality of quilt title thing.

The utility model manufacturing is simple, and cost is lower, and the weighing precision height can be designed to the automatic title of all size as required, and is easy to use.

Fig. 1 is a structural representation of the present utility model, wherein, and 1. pan of a steelyard, 2. tooth bar, 3. gear, 4. balance bob, 5. T-bar, 6. pinion wheel, 7. pointer, 8. index dial, 9. connecting rod.

Fig. 2 is a schematic diagram of the present utility model, wherein, F is claimed the quality of thing, A is claimed the application point of thing pressure, and O is the gear center of circle, and C is the intersection point of connecting rod and T-bar, B is the center of gravity of balance bob, G is the quality of balance bob, and l is the distance that T-bar leaves initial position, and θ is the angle that balance bob turns over respect to the original position.

Embodiment: structure as shown in Figure 1, design concept such as Fig. 2, index dial are the concentric discs of pinion wheel, each parts all adopt metal material.

Claims (2)

1. a moment-equilibrium equation claims automatically, it is characterized in that, pan of a steelyard by the band tooth bar, the gear of band balance bob, the T-bar of band tooth bar and the pinion wheel composition that is fixed with the band pointer of index dial, the concrete connection is that the toothed vertical tooth rack of a side is fixed in the center below the pan of a steelyard, the tooth of tooth bar and a gearing mesh, this gear is connected to a connecting rod, the other end of connecting rod is fixed a balance bob, the C point of connecting rod connects on the T-bar upper boom of a horizontal band tooth bar by pin, fix a concentric index dial below the pinion of the tooth of T-bar tooth bar and a band pointer, pinion wheel.

2. moment-equilibrium equation as claimed in claim 1 claims automatically, it is characterized in that, described index dial is disk or annulus.

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