CN2493919Y

CN2493919Y - Device for measurikng rotary inertia of shaped object

Info

Publication number: CN2493919Y
Application number: CN 01253438
Authority: CN
Inventors: 韩九阳; 隋波; 刘昊明; 余俊; 李先成; 刘晓林; 邓见涛; 罗光明
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-08-31
Filing date: 2001-08-31
Publication date: 2002-05-29
Anticipated expiration: 2011-08-31

Abstract

The utility model discloses an inertia measuring device for profiled objects, which consists of a stiffness coefficient torsion bar with linear elasticity, two homogeneous discs and a support, wherein one homogenous disc is fixed at the lower end of the torsion bar; the other homogeneous disc is fixed by the coaxial support which is positioned on the same plane as the two discs; the disc is formed by a chassis and a convex ring form around the chassis; the inner sidewall of the ring form is provided with a light hole which has a photosensitive time determinator inside; scales are arranged along the binding part between the chassis and the bottom of the ring form, or on the sidewall of the ring form; a laser emitter is positioned at the position of the outer chassis sidewall fixed at the lower end of the torsion bar corresponding to the light hole. The utility model, adopting the torsional vibration method which effectively overcomes the shortcomings of the prior shimmy method, has the advantages of simple structure, reasonable design, high automation degree and accuracy with fast speed.

Description

A kind of device of measuring special-shaped object rotation inertia

Technical field

The utility model relates to a kind of measurement mechanism, relates in particular to a kind of determinator of special-shaped object rotation inertia.

Background technology

Often will reasonably select to have the object of certain moment of inertia on request on the engineering, be extremely important so accurately measure arbitrary object rotation inertia.In general, the moment of inertia of regular shape object is easy to measure, but in most of the cases, and the member that adopts in the engineering is that irregular object is that the mensuration of the moment of inertia of special-shaped object is extremely difficult.Adopt at present shimmy method to measure, because the limitation of measuring condition, make measurement result not accurate enough and be difficult to realize.

Summary of the invention

The purpose of this utility model is: overcome the above-mentioned defective of prior art, a kind of device that adopts torsional oscillation method to measure special-shaped object rotation inertia accurately, fast is provided.

The utility model is made of linear elasticity stiffness coefficient torsion bar, two homogeneous disks and bearing, one homogeneous disk is fixed in the torsion bar lower end, another homogeneous disk is fixed by bearing, coaxial and be positioned on the same surface level with disk, this disk constitutes by the chassis and along the annular solid of chassis peripheral projections, the annular solid madial wall is provided with light hole, photosensitive time detector is housed in the light hole, along being provided with scale with the junction surface or the annular solid sidewall of annular solid bottom on the chassis, being fixed on the disk lateral wall of torsion bar lower end and being provided with generating laser with the light hole opposite position.Photosensitive time detector is made of photoresistance, single-chip microcomputer, anti-phase integrated circuit, rejection gate integrated circuit, two input-output register integrated circuit, seven decoder drivers, charactron and direct supplys.

The utility model can remedy the deficiency of existing shimmy method rationally and effectively, and is simple in structure, reasonable in design, automaticity is high, measure the moment of inertia of special-shaped object quickly and accurately, to satisfy the needs of industrial design.

Description of drawings

Fig. 1: be structural representation of the present utility model;

Fig. 2: be the circuit diagram of photosensitive time detector of the present utility model.

Below in conjunction with accompanying drawing the utility model is elaborated.

Embodiment

The utility model is made of linear elasticity stiffness coefficient torsion bar 1, two homogeneous disks 2,3 and bearing 4, homogeneous disk 2 is fixed in torsion bar 1 lower end, homogeneous disk 3 is fixing by bearing 4, coaxial and be positioned on the same surface level with disk, disk 3 constitutes by annular chassis 8 and along the annular solid 9 of chassis peripheral projections, annular solid 9 madial walls are provided with light hole 6, photosensitive time detector 7 is housed in the light hole 6, along being provided with scale 5 with the junction surface or annular solid 9 sidewalls of annular solid 9 bottoms on the chassis 8, be provided with generating laser 10 with light hole 6 opposite positions on disk 2 lateral walls.

Photosensitive time detector 7 of the present utility model is made of photoresistance CDS, single-chip microcomputer IC1, anti-phase integrated circuit (IC) 3,2 input rejection gate integrated circuit (IC) 2,8 inputs 8 output register integrated circuit (IC) 4, seven decoder driver IC5, charactron 11 and direct supply E.The sampled signal of photoresistance CDS is delivered to single-chip microcomputer IC1 external interrupt input port INT0 mouth after anti-phase integrated circuit (IC) 3 anti-phase outputs, the P2.0 of single-chip microcomputer IC1, P2.1 mouth and write control end pin WR and divide two tunnel to link to each other with 2 input rejection gate integrated circuit (IC2) two input ends respectively, two output terminals of 2 input rejection gate integrated circuit (IC) 2 respectively with two register IC4-1, the Enable Pin CE of IC4-2 links to each other, the P0.0-P0.7 of single-chip microcomputer IC1 respectively with two register IC4-1 of the integrated IC circuit 4 of register, the IC4-2 input end links to each other, two register IC4-1, IC4-2 delivery outlet 1Q-8Q exports seven sections decoder driver IC5 input end A0-A4 successively to, and seven sections decoder driver IC5 output terminals link to each other with charactron 11.

Principle of work of the present utility model is:

Photoresistance CDS accepts infrared ray, when infrared ray shines on the resistance CDS, has electric current to flow through, and produces pulse signal.This signal is given single-chip microcomputer IC1 external interrupt port INT0 after anti-phase integrated circuit (IC) 3 is anti-phase, external interrupt signal is provided.Anti-phase integrated circuit (IC) 3 provides the numeration signal of inner register for the P3.5 mouth.The P3.5 mouth is the numeration signal of timer internal, and promptly when the P3.5 mouth occurred by the high level negative saltus step of level on earth, inner register T1 was 1 automatically.After pulse for the first time arrived, single-chip microcomputer was by producing pulse once more, and single-chip microcomputer IC1 stops to begin numeration, and time interval of two subpulses is recorded in the middle of the inner storer.

Single-chip microcomputer IC1 8051 P0.0-P0.7 are the data output pin, what export is decimal system binary-coded decimal numerical value, P2.0, the chip select lines of two of P2.1 expansion delivery outlet IC4-1, IC4-2, they are write control end WR by 2 input rejection gate IC2 74LS02 and single-chip microcomputer IC1 and work together and choose different extended chips to finish the delivery outlet expansion.Concrete working method is as follows: P2.0P2.1 can not be 1 simultaneously, and for P2.0 is 0, the WR mouth is 0 o'clock, and then the output port of rejection gate IC2 is 0, chooses IC4-1; Same choose the IC4-2 chip when P2.1 mouth and WR mouth are all low level, the data that single-chip microcomputer is exported are deposited with wherein.Register 74LS273IC4-1, the IC4-2 of two 8 input 8 outputs only when the CE mouth is 0, is sent in seven sections decoding/driver ICs 5 7446 with the data preservation of P0.0-P0.7L output and by delivery outlet 1Q-8Q and goes.Seven sections decoding/driver IC 5 TTL7446 are translated into seven receptible signals of charactron with decimal system binary-coded decimal signal, and drive the luminous display digit of charactron.Thereby timing and Presentation Function have been finished.

Use bolt on the homogeneous disk object under test during use, device is fixed, regulate disk light datum line, make it aim at the index dial zero graduation.Energized, it is arbitrarily angled that employing manually makes homogeneous disk and determinand turn over, and reads angle from index dial; Press the button of photosensitive time detector, but because do not have laser to be mapped to receiving trap this moment, so photosensitive time detector does not clock, when the zero graduation line returns in community, optical pickup apparatus receives that light signal begins to clock, and when community went back to the zero graduation line once more, photosensitive time detector converted by inner, the display cycle data then can calculate this abnormity object rotation inertia by the same period and angle-data.

Claims

1, a kind of device of measuring special-shaped object rotation inertia, it is characterized in that: by linear elasticity stiffness coefficient torsion bar (1), two homogeneous disks (2,3) and bearing (4) constitute, homogeneous disk (2) is fixed in torsion bar (1) lower end, homogeneous disk (3) is fixing by bearing (4), coaxial and be positioned on the same surface level with disk, disk (3) constitutes by chassis (8) and along the annular solid (9) of chassis peripheral projections, annular solid (9) madial wall is provided with light hole (6), photosensitive time detector (7) is housed in the light hole (6), (8) junction surface or annular solid (9) sidewall last and annular solid (9) bottom is provided with scale (5) along the chassis, is provided with generating laser (10) with light hole (6) opposite position on disk (2) lateral wall.

2, the device of the special-shaped object rotation inertia of mensuration as claimed in claim 1 is characterized in that: chassis (8) are annular.

3, the device of the special-shaped object rotation inertia of mensuration as claimed in claim 1, it is characterized in that: photosensitive time detector (7) is by photoresistance (CDS), single-chip microcomputer (IC1), anti-phase integrated circuit (IC3), 2 input rejection gate integrated circuit (IC2), 8 inputs, 8 output register integrated circuit (IC4), seven decoder drivers (IC5), charactron (11) and direct supply (E) constitute, the sampled signal of photoresistance (CDS) is delivered to single-chip microcomputer (IC1) external interrupt input port INT0 mouth after the anti-phase output of anti-phase integrated circuit (IC3), the P2.0 of single-chip microcomputer (IC1), P2.1 mouth and write control end pin WR and divide two tunnel to link to each other with 2 input rejection gate integrated circuit (IC2) two input ends respectively, 2 the input rejection gate integrated circuit (IC2) two output terminals respectively with two register (IC4-1, IC4-2) Enable Pin CE links to each other, the P0.0-P0.7 of single-chip microcomputer (IC1) respectively with two register (IC4-1 of the integrated circuit of register (IC4), IC4-2) input end links to each other, two register (IC4-1, IC4-2) delivery outlet 1Q-8Q exports three seven sections decoder drivers (IC5) input end A0-A4 successively to, and seven sections decoder drivers (IC5) output terminal links to each other with charactron (11).