CN201210102Y - Lever for lever type force standard machine - Google Patents

Abstract

The utility model discloses a lever used in lever type force standard machine, which comprises a base and a lever supported by the base. A weight is arranged at one end of the lever, and a force-measuring device is positioned at the other end; the lever is in integrative type; and the ratio between the torque at the end with the weight of the lever and the torque at the end with the force-measuring device is 10. The utility model has the following beneficial effects: the lever is in integrative type; in particular, the alloy steel 35CrMo is cast as a whole to form the lever; thus the overall deformation of the lever for measuring the force is reduced; the deviation of the lever torque ratio is effectively reduced; and the accuracy of measurement is effectively improved.

Description

The lever that a kind of lever force standard machines is used

Technical field

The utility model relates to the lever that a kind of lever force standard machines is used, and is used on the lever force standard machines.

Background technology

At present, in whole power value verification system, lever plays an important role, and force standard machines can be divided into two classes: the first kind is the fixed standard of generation power value.This class standard device is branch dead weight formula, lever, fluid pressure type and superposing type etc. by structure.Second class is the various portable standard of transmission power value.This standard can be divided into dynamometers such as percentage tabular form, mercury are box, optical profile type, laser type, strain-type, piezomagnetic, inductance type, condenser type, type vibration wire by its measuring principle.

The lever force standard machines is a scale load with the masterpiece that counterweight produces, and amplifies the back through suitable leverage and automatically the power value is added on the tested dynamometer by predefined procedure.It obtains bigger power value than Dead Weigh Force Standard Machine is easy, its metrology performance depends primarily on the structure and the combined situation of lever, structure that blade and cutter hold and installation and processing quality etc., domestic this machine is the simple lever structure at present, the maximum, force value has four kinds of 1MN, 30kN, 100kN and 60kN (comprising a small amount of 50kN), power value overall uncertainty Generally reach 3 * 10 ^-4, even reach 1 * 10 ^-4The factor of influence power value uncertainty has multiple, but a main aspect is the deformation that lever itself produces, the lever of general lever force standard machines is by the welding manner moulding, thereby often because the precision of welding technology itself and welding portion influences instrument itself in the micro-deformation of use measuring accuracy.

The utility model content

The purpose of this utility model provides the lever that a kind of novel a kind of lever force standard machines is used, thereby makes it well overcome above-mentioned technical matters in use by the design to lever, improves the precision of measuring, and reduces the uncertainty of power value.

In order to reach above-mentioned technique effect, the utility model provides following technical proposals:

The lever that a kind of lever force standard machines is used comprises a pedestal, the lever of a base supports, one end of described lever is provided with a counterweight, the other end is provided with a dynamometer, and described lever is formed in one, and the moment of the counterweight end of described lever and the torque ratio of dynamometer end are 10.

Further, described counterweight is arranged on the emphasing knife of lever, and described pedestal is arranged on the fulcrum pivot of lever, and described dynamometer is arranged on the force cutter of lever.

Effect of the present utility model is: this patent is owing to adopt one-shot forming to lever, concretely, adopt alloy steel 35CrMo monoblock cast to be shaped, reduced the bulk deformation of lever when dynamometry like this, thereby effectively reduced the deviation of lever moment ratio, effectively raised the precision of measurement.

Description of drawings:

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

Fig. 2 is the vertical view of Fig. 1;

Fig. 3 is a schematic diagram of the present utility model.

Embodiment

Now the utility model embodiment is described further in conjunction with embodiment:

As shown in Figure 1 and Figure 2, the force standard machines lever comprises a pedestal 2, the lever 1 that one pedestal 2 supports, an end of lever 1 is provided with a counterweight 4, and the other end is provided with a dynamometer 3, lever 1 is formed in one, and the moment of the counterweight end of lever 1 and the torque ratio of dynamometer end are 10.Counterweight 4 is arranged on the emphasing knife 41 of lever 1, and pedestal 2 is arranged on the fulcrum pivot 21 of lever 1, and dynamometer 3 is arranged on the force cutter 31 of lever.

Whole principle of work of the present utility model can be equipped with O, A, B three cutter referring to shown in Figure 3 on lever AB, be called fulcrum pivot O, and emphasing knife A, force cutter B, P are the gravity that counterweight produces, and F is the suffered power of checking matter.

The aerial gravity of counterweight is:

F _o＝mg—Vρ _kg＝mg(1—ρ _k/ρ _f) (1)

F _o: the gravity that counterweight produced, unit are N

M: the quality of counterweight, unit is kg

ρ _k: atmospheric density, unit is kg/m ³

ρ _f: counterweight density of material, unit are kg/m ³

G: the on-site acceleration of gravity of counterweight, unit are m/s ²

Lever AB is in equilibrium state under the effect of power P and F, then have according to mechanics principle:

Pa＝Fb (2)

If $K_L=\frac{a}{b}$ , the power value that produces of lever then

F _Lo＝K _LP (3)

By formula (1) as can be known:

$P=\mathrm{mg}(1-\frac{{\mathrm{\ρ}}_k}{{\mathrm{\ρ}}_f})---\left(4\right)$

In the formula: the quality of m-counterweight, unit is kg

The on-site acceleration of gravity of g-counterweight, unit are m/s ²

ρ _k-atmospheric density, unit is kg/m ³

ρ _f-counterweight density of material, unit are kg/m ³

To obtain in the P substitution formula (4)

$F_{\mathrm{Lo}}=K_L\mathrm{mg}(1-\frac{{\mathrm{\ρ}}_k}{{\mathrm{\ρ}}_f})---\left(5\right)$

With formula (1) and formula (4) relatively, can know and find out: many COEFFICIENT K in the formula (5) _L, this K _LBe exactly amplification coefficient, when other parameter constant, K _LThe power that big more then standard machine produces is just big more, and this also is that the lever force standard machines is done big reason easily than Dead Weigh Force Standard Machine range.But simultaneously many these K _L, with regard to many influence power values factor accurately, K _LBig more, lever is just long more, and its distortion is also just big more, and the accuracy of power value is also just low more.This also is one of Lever machine reason lower than the accuracy of dead weight machine.For this reason, K _LThat can not select is too big, in view of the above the K of this mechanism _LBe 10.Can better reduce power value uncertainty like this.

Claims (2)

1, the lever used of a kind of lever force standard machines, comprise a pedestal, the lever of one base supports, one end of described lever is provided with a counterweight, the other end is tested end, it is characterized in that: described lever is casting integrated moulding, and the moment of the counterweight end of described lever and the torque ratio of tested end are 1:10.

2, the lever used of lever force standard machines according to claim 1, it is characterized in that: described counterweight is arranged on the emphasing knife of lever, and described pedestal is arranged on the fulcrum pivot of lever, and described tested end is arranged on the force cutter of lever.

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