CN201444101U

CN201444101U - Rotational inertia measuring device

Info

Publication number: CN201444101U
Application number: CN2009200143781U
Authority: CN
Inventors: 丛培田; 张宗媛; 韩辉; 刘玉梅
Original assignee: Shenyang Ligong University
Current assignee: Shenyang Ligong University
Priority date: 2009-06-05
Filing date: 2009-06-05
Publication date: 2010-04-28
Anticipated expiration: 2019-06-05

Abstract

A rotational inertia measuring device comprises a box body, a central shaft, two dynamic shafts, two pendulum shafts, a column spiral compression spring, an eccentric wheel, an eccentric shaft and a handle, wherein the central shaft is supported on the box body by two angular contact ball bearings at two ends; one end of each dynamic shaft and one end of each pendulum shaft are respectively and symmetrically connected with the upper part and the lower part of the central shaft through threads; the eccentric shaft is sheathed with a handle seat which is arranged on the box body; one end of the eccentric shaft is connected with one dynamic shaft end through a threading connector, and the dynamic shaft end is provided with a deep groove ball bearing and the inner ring thereof is connected with the dynamic shaft through a key, and the eccentric wheel is arranged on the deep groove ball bearing; the other ends of the two pendulum shafts are all connected with one end of the column spiral compression spring in the same direction, and the other end of the spring is connected and fixed on a spring hook seat of a bearing load table; and the handle is arranged on the eccentric shaft. The rotational inertia measuring device has simple structure; and the mounting and commissioning are simple, safe and reliable; the measurement accuracy is high, and the measurement speed is high and the stability is better; and the operation is convenient. The rotational inertia measurement device can be widely applied to scientific research and manufacturing fields such as aerospace, aviation, machinery and biological dynamics and the like.

Description

A kind of rotation inerttia device

Technical field

The utility model relates to a kind of rotation inerttia device at complex revolving body.

Background technology

In automatic control systems such as radar, the moment of inertia of controlled device is an important parameter.And controlled device is made up of many optics, component of machine, electric component often.They have complicated geometric configuration, are difficult to accurately calculate their moment of inertia, often need determine its moment of inertia with the method for test in the engineering.

At present, the method for measuring moment of inertia mainly contains: physical pendulum method, the three-way method, falling bodies method, single line of rocking are rocked measuring methods such as method, metal torsion bar torsional oscillation method.But said method exists error bigger, and precision is lower, and shortcomings such as dangerous and measuring process complexity are installed when measuring big workpiece.Traditional method of rocking generally all is that the rotation period of testee is directly measured, and the variation of damping ratio can influence the cycle during measurement, causes the inaccurate of measuring period; In test signal, there is noise, cycle signal zero-cross point is exerted an influence, the error that causes during computation period, therefore traditional method of rocking is difficult to the precision of the moment of inertia of assurance measurement.

Summary of the invention

The technical problems to be solved in the utility model provides a kind of measuring accuracy height, fast, the good stability, easy to operate of speed, and is simple in structure, is fit to various solid of revolution or non-regular object rotation inerttia device.

The technical scheme that adopts is:

A kind of rotation inerttia device comprises casing, central shaft, line shaft, rocks axle, cylindroid helical-coil compression spring, eccentric wheel, camshaft and handle.Angular contact ball bearing is equipped with at described central shaft two ends, and central shaft is supported on the loading ability of bearing platform in casing and the casing by the two ends angular contact ball bearing, and fixes with bearing cap and round nut respectively.The end that two line shafts and two the rock axle central shaft upper and lower that is threaded symmetrically respectively, and fastening with nut.Be set with handle base on the described camshaft, handle base is contained on the casing and fixedly connected casing, camshaft one end is connected by threaded connector with a power axle head, the power axle head is equipped with deep groove ball bearing, the inner ring of deep groove ball bearing is connected with flat key with line shaft, with the shaft shoulder and the spring collar location that is installed on the threaded connector, eccentric wheel is contained on the deep groove ball bearing.Described two other ends that rock axle all connect an end of cylindroid helical-coil compression spring on same direction, the spring other end is fastened on the spring carrier arm seat of loading ability of bearing platform.Described handle is installed on the camshaft.

Above-mentioned handle is made up of handle set, handlebar and handle ball, and handle set is contained in the other end of camshaft, and the handlebar threaded one end connects handle set, and handle ball is threaded in the other end of handlebar.

This device is equipped with sensor, computing machine, the vibration damping waveform that produces by cylindroid helical-coil compression spring vibration on the sensor handle assembly passes to computing machine, device is rocked the generation vibration signal, by the USB capture card vibration signal is gathered accurately, calculate the damping proportion natural frequency of vibrational system by virtual instrument software, and then accurately calculate moment of inertia.

The utility model is reasonable in design, principle of work is clear and definite, simple in structure, parts are few, install and debug simply, safety, reliable, measuring accuracy height, speed are fast, good stability, easy to operate, be widely used in scientific research, production fields such as space flight, aviation, weapons, machinery, light industry and biomechanics.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

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

Fig. 3 is the A-A cut-open view of Fig. 1.

Fig. 4 is that the C of Fig. 1 is to view.

Embodiment

A kind of rotation inerttia device comprises casing 1, central shaft 3, line shaft 8, rocks axle 9, cylindroid helical-coil compression spring 10, eccentric wheel 14, camshaft 19 and handle.Angular contact ball bearing 5 is equipped with at described central shaft 3 two ends, and central shaft 3 is supported on the loading ability of bearing platform 24 in casing 1 and the casing by two ends angular contact ball bearing 5, and fixing with bearing cap 4 and round nut 12 respectively.Its bearing cap 4 usefulness hexagon socket cap head screws 2 and spring washer 6 are fixed on the casing 1.The end that two line shafts 8 and two rock axle 9 central shaft 3 upper and lowers that are threaded symmetrically respectively, and fastening with nut 13,7.Be set with handle base 20 on the described camshaft 19, handle base 20 is contained on the casing 1 and fixedly connected casing 1, camshaft 19 1 ends are connected by threaded connector 18 with line shaft 8 ends, line shaft 8 ends are equipped with deep groove ball bearing 17, the inner ring of deep groove ball bearing 17 is connected with flat key 16 with line shaft 8, with the shaft shoulder and spring collar 15 location that are installed on the threaded connector 18, eccentric wheel 14 is contained on the deep groove ball bearing 17.Described two are rocked axle 9 the other end all connects cylindroid helical-coil compression spring 10 on same direction a end, and the spring other end is fastened on the spring carrier arm seat 11 of loading ability of bearing platform 24.Described handle is made up of handle set 21, handlebar 22 and handle ball 23, and handle set 21 is contained in the other end of camshaft 19, and handlebar 22 threaded one ends connect handle set 21, and handle ball 23 is threaded in the other end of handlebar 22.

Principle of work:

Measured workpiece is placed on the objective table that is connected with central rotating shaft 3, makes the axle center of measured workpiece and the axle center alignment of central rotating shaft, uses handle and rotates an angle, rock to add on the axle 9 magnet is arranged, when Hall switch is sensed the absorption of magnet, electromagnetic actuation will rock axle and hold.Because handle connects eccentric wheel 14, in the time of turning handle once more, eccentric wheel is forwarded to and deep groove ball bearing 17 disengaged positions, then behind the Push switch release magnet, rock axle 9 and begin swing, whole signals that will vibrate by sensor and capture card are sent into computing machine and are handled, and moment of inertia is presented on the graphoscope the most at last.

Claims

1. rotation inerttia device, comprise casing (1), central shaft (3), line shaft (8), rock axle (9), cylindroid helical-coil compression spring (10), eccentric wheel (14), camshaft (19) and handle, it is characterized in that described central shaft (3) two ends are equipped with angular contact ball bearing (5), central shaft (3) is supported on the loading ability of bearing platform (24) in casing (1) and the casing by two ends angular contact ball bearing (5), and it is fixing with bearing cap (4) and round nut (12) respectively, the end that two line shafts (8) and two rock axle (9) central shaft (3) upper and lower that is threaded symmetrically respectively, and with nut (13,7) fastening, be set with handle base (20) on the described camshaft (19), handle base (20) is contained in casing (1) and goes up and fixedly connected casing (1), camshaft (19) one ends are connected by threaded connector (18) with a line shaft (8) end, line shaft (8) end is equipped with deep groove ball bearing (17), the inner ring of deep groove ball bearing (17) is connected with flat key (16) with line shaft (8), with the shaft shoulder and spring collar (15) location that is installed on the threaded connector (18), eccentric wheel (14) is contained on the deep groove ball bearing (17), described two other ends that rock axle (9) all connect an end of cylindroid helical-coil compression spring (10) on same direction, the spring other end is fastened on the spring carrier arm seat (11) of loading ability of bearing platform (24).

2. a kind of rotation inerttia device according to claim 1, it is characterized in that described handle is made up of handle set (21), handlebar (22) and handle ball (23), handle set (21) is contained in the other end of camshaft (19), handlebar (22) threaded one end connects handle set (21), and handle ball (23) is threaded in the other end of handlebar (22).