CN216524560U - Miniature rotational inertia measuring device based on air bearing - Google Patents
Miniature rotational inertia measuring device based on air bearing Download PDFInfo
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Abstract
The invention discloses a micro rotational inertia measuring device based on an air bearing, which comprises a working disc, an air bearing rotating shaft, an air bearing seat and a photoelectric tube seat, wherein the air bearing rotating shaft is arranged on the working disc; the working disc is arranged at the uppermost end of the measuring device; the air floatation rotating shaft is of a T-shaped rotary structure, the lower part of the air floatation rotating shaft is directly inserted into an air floatation bearing working hole, the side surface of the air floatation bearing seat is provided with an air guide hole, and an air hose penetrates through the air guide hole to introduce air into the air floatation bearing, so that the air floatation rotating shaft keeps an air floatation state; when measuring inertia, adjust the spacing subassembly of pivot angle earlier and make the suitable angle of working disc swing, later place the piece that awaits measuring, stir workstation to extreme position with the hand, release afterwards, measure its swing cycle by the photoelectric tube, obtain inertia. The measuring device has the advantages of reliable work, simple operation and rapid measurement, stably balances the measurement error of the rotational inertia caused by friction, and improves the accuracy of measuring the rotational inertia of a tiny object.
Description
Technical Field
The invention belongs to the technical field of measurement, and particularly relates to a micro rotational inertia measuring device.
Background
The moment of inertia is a measure of the inertia of a rigid body when it rotates, and depends on the shape, mass distribution, and spindle position of the object. The object with regular shape and uniform mass distribution can be directly calculated through a formula, but the object which needs to calculate the moment of inertia and is encountered in engineering is usually complex in structure or assembled by a plurality of parts, and in this case, the moment of inertia needs to be measured by an experimental measuring device.
Because the torsional pendulum method is simple in principle, safe, reliable and easy to operate, the existing measuring equipment for the rotational inertia is mainly a measuring table based on the torsional pendulum method. The core components of the torsional pendulum method rotational inertia measuring table are a working disc component (comprising a rotating shaft, a bearing and a rotating disc) which can horizontally swing around a fixed shaft and a torsion bar which drives the working disc to swing. The measuring principle is that external force is applied to the rotary table, the torsion bar swings by a small angle, the rotary table and the piece to be measured freely swing together under the driving of the restoring force of the torsion bar after the external force is cancelled, and the swing period is measured through the sensor, so that the rotational inertia of the piece to be measured can be calculated.
At present, the rotational inertia of a microminiature object is accurately measured by a torsional pendulum method, and the problems still exist: 1) the moment of inertia of the measuring table itself. Because the rotational inertia of the object is very small, the rotational inertia of the turntable of the measuring table cannot exceed the to-be-measured piece too much, otherwise, the measuring precision is greatly influenced. 2) And a power element of the measuring table. When the torsional pendulum method rotational inertia measuring equipment freely swings, the swing period of the rotary table is basically controlled to be about 1Hz on the premise of simultaneously balancing the measuring accuracy and ensuring the safety. The torsion bar commonly used by the power element of the rotational inertia measuring table based on the torsional pendulum method at present needs to be very small in rigidity in order to ensure that the swing period is controlled to be about 1Hz when the micro rotational inertia is measured, the diameter of the torsion bar needs to be controlled to be 1-2mm, and the length of the torsion bar is 100 plus 150 mm. Because the thin torsion bar is difficult to process, a formed steel wire is generally adopted, and the thin steel wire is poor in linearity and easy to bend in practical use, so that the linearity of the torsion bar is poor, and the measurement accuracy is greatly influenced. In addition, the torsion bar has small rigidity and small restoring force, and the small friction force of the support bearing can cause larger damping, so that the measurement equipment using the thin torsion bar is difficult to measure the tiny rotational inertia.
In order to solve the problem of friction damping of the mechanical bearing support, an air floatation support can be adopted. The existing air-float type measuring equipment is a quality characteristic comprehensive test bench based on a spherical air-float bearing, as disclosed in patent CN 103389183A. The spherical air bearing is adopted, the torsion bar is adopted as the swinging element, and not only can the rotational inertia be measured, but also the mass center and the weight can be measured. However, the rotary inertia of the rotary table of the device is large, and the rotary inertia of a tiny object cannot be measured. Patent CN205506296U discloses an air-floating type rotational inertia measuring table, the air-floating bearing adopted by the measuring table is formed by high-precision machining, and is divided into a bearing outer sleeve and a rotating shaft, fine air holes are arranged on the contact surface of the inner wall of the bearing outer sleeve and the rotating shaft, and the rotating shaft is close to an air-floating state after being ventilated.
In order to solve the problem that the thin torsion bar is difficult to process, a torsion spring is adopted as a driving element in small-sized rotational inertia measurement. The small air bearing solution described in patent CN2742416Y uses a torsion spring, but it integrates the air bearing and the turntable. Because the air bearing has high processing precision requirement, the mode is difficult to realize in engineering.
Therefore, a high-precision micro-rotational inertia measuring table with simple structure, high reliability and convenient maintenance is lacked in the prior art.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a micro rotational inertia measuring device based on an air bearing, which comprises a working disc, an air bearing rotating shaft, the air bearing, an air bearing seat and a photoelectric tube seat, wherein the working disc is provided with a first end and a second end; the working disc is arranged at the uppermost end of the measuring device; the air floatation rotating shaft is of a T-shaped rotary structure, the lower part of the air floatation rotating shaft is directly inserted into an air floatation bearing working hole, the side surface of the air floatation bearing seat is provided with an air guide hole, and an air hose penetrates through the air guide hole to introduce air into the air floatation bearing, so that the air floatation rotating shaft keeps an air floatation state; when measuring inertia, adjust the spacing subassembly of pivot angle earlier and make the suitable angle of working disc swing, later place the piece that awaits measuring, stir workstation to extreme position with the hand, release afterwards, measure its swing cycle by the photoelectric tube, obtain inertia. The measuring device has the advantages of reliable work, simple operation and rapid measurement, stably balances the measurement error of the rotational inertia caused by friction, and improves the accuracy of measuring the rotational inertia of a tiny object.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a micro rotational inertia measuring device based on an air bearing comprises: the device comprises a working disc, an air floatation rotating shaft, an air floatation bearing seat, a support frame, a base, a plane volute spring, a spring inner shaft, a photoelectric tube seat, an adjustable rotating needle, an angle limiting shaft, a horizontal adjusting pin, a spring fixing assembly and a swing angle limiting assembly;
the spring fixing assembly comprises a spring outer pressing block and a spring mounting seat; the swing angle limiting assembly comprises an angle limiting outer ring and an angle limiting inner ring;
the working disc is arranged at the uppermost end of the measuring device; the lower end of the working disc is provided with a groove, and the groove is matched with the upper end surface of the air floatation rotating shaft and is rigidly connected with the upper end surface of the air floatation rotating shaft through a fastener;
the air floatation rotating shaft is of a T-shaped rotary structure, the lower part of the air floatation rotating shaft is directly inserted into an air floatation bearing working hole, and the air floatation rotating shaft and the air floatation bearing working hole are matched to enable the working disc to be in a floating state; meanwhile, the lower end of the air floatation rotating shaft is provided with a positioning hole, and the positioning hole is matched with an upper boss at the upper end of the spring inner shaft and is rigidly connected with the upper boss through a screw;
the air floatation bearing block is of a T-shaped rotary structure, the middle of the air floatation bearing block is provided with a mounting through hole for inserting the air floatation bearing, a boss at the upper part of the air floatation bearing block is provided with a threaded hole as a mounting hole of a support frame, the side surface of the air floatation bearing block is provided with an air guide hole, and an air hose penetrates through the air guide hole to introduce air into the air floatation bearing; meanwhile, a photoelectric tube seat mounting threaded hole is formed in the side surface of the air bearing seat;
the spring inner shaft is divided into four sections from top to bottom, namely an upper boss, an adjustable rotating needle mounting section, a plane volute spring mounting section and an angle limiting shaft mounting section; the adjustable rotating needle, the planar spiral spring and the angle limiting shaft are respectively and rigidly connected with the inner spring shaft at corresponding sections;
the upper end of the support frame is installed in a support frame installation hole of the air floatation bearing seat through a screw, and the lower end of the support frame is rigidly connected with the base;
the base is provided with a circular groove in the center and matched with the angle limiting outer ring, and the circular groove and the angle limiting outer ring are in rigid connection through bolts, so that the whole swing angle limiting assembly can rotate around an axis; the base is provided with a square through hole near the edge for mounting a spring mounting seat; the three horizontal adjusting feet are arranged on the base through three threaded holes which are uniformly distributed on the base and are used for supporting the measuring device;
the angle limiting outer ring is provided with a groove which is matched with the angle limiting inner ring, so that the two rings can do relative circular motion around an axis, meanwhile, the outer circumferences of the upper ends of the two rings are respectively provided with a stop block, the distance between the two stop blocks can be adjusted at will through the relative motion between the two rings, the angle limiting shaft is arranged between the two stop blocks, and the swing angle and the limit position of the working disc can be adjusted by adjusting the positions of the angle limiting inner ring and the angle limiting outer ring;
the spring mounting seat is mounted in the square through hole of the base, the spring outer pressing block is mounted above the spring mounting seat, and a gap is formed between the spring mounting seat and the spring outer pressing block;
the photoelectric tube seat is arranged on the side surface of the air bearing seat through a photoelectric tube seat mounting threaded hole;
the adjustable pendulum pin is provided with an open ring hole, and the adjustable pendulum pin is screwed down through a bolt to clamp the inner shaft of the spring;
the inner ring of the flat spiral spring is rigidly connected with the flat spiral spring mounting section of the spring inner shaft, and the outer ring of the flat spiral spring extends into a gap between the outer spring pressing block and the spring mounting seat and is pressed and fixed by the outer spring pressing block and the spring mounting seat.
Preferably, the air bearing is made of a porous carbon material, and a layer of uniform air film is formed on the surface of the porous carbon material substrate after ventilation by using millions of submicron holes in the porous carbon material substrate, so that the air floating rotating shaft is kept in an air floating state.
Preferably, the working disc is formed by processing an aluminum alloy material, and is provided with three flanges which are uniformly distributed and arranged along the axis, so that a worker can conveniently stir the working disc to fix the swing angle.
Preferably, the spring inner shaft is made of aluminum alloy material.
Preferably, the flat spiral spring mounting section is of a semi-cylindrical structure, and the flat spiral spring is pressed through a semi-cylindrical spring pressing block matched with the flat spiral spring mounting section.
Preferably, the spring mounting seat can adjust the mounting height in the square through hole so as to facilitate the working state of the flat spiral spring.
The invention has the following beneficial effects:
1) the device can measure the rotational inertia of the object at the minimum by 10g cm2And the measurement precision is as high as 0.1%.
2) The device adopts the porous carbon material air bearing, the air bearing has small volume, is installed by circumferential compression, and is convenient to install; in addition, the air floatation bearing made of porous carbon materials is adopted, the air floatation stability is good, the air consumption is low, and the system only needs to be provided with a small compressor for air supply.
3) The device adopts the torsion spring as a driving element, the torsion spring has large swing angle, good linearity and convenient installation, and the measurement precision can not be reduced due to the installation error of the torsion spring.
4) The device has the advantages of simple system structure, easy assembly and high reliability. The formed porous carbon material air bearing is low in cost and can be popularized and applied as a high-precision measuring instrument for rotational inertia of a tiny object.
Drawings
Fig. 1 is a front view of the structure of the present invention.
Fig. 2 is a side view of the structure of the present invention.
FIG. 3 is a schematic view of the spring mounting assembly of the present invention.
In the figure: 1-working disc, 2-air-floating rotating shaft, 3-air-floating bearing, 4-air-floating bearing seat, 5-supporting frame, 6-base, 7-angle limiting outer ring, 8-angle limiting inner ring, 9-plane volute spring, 10-spring inner shaft, 11-spring outer pressing block, 12-spring mounting seat, 13-photoelectric tube mounting seat, 14-adjustable swinging pin, 15-angle limiting shaft, 16-horizontal adjusting pin and 17-spring fixing component.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The invention aims to solve the problem of providing a high-precision, convenient-to-operate and easy-to-maintain microminiature rotational inertia measuring table aiming at the defects of the prior art.
In order to overcome the defects that the existing air bearing has large volume and large self rotational inertia and can not accurately measure the rotational inertia of a tiny object, the invention adopts the porous carbon material air bearing, the diameter of the air bearing is only 50mm, the bearing capacity can reach 10kg, the volume of the air bearing is small, and the rotational inertia of a matched turntable can be lower than 760 kg.mm2The measuring precision of the rotational inertia of the micro object can be ensured. In addition, the measuring table makes full use of the superiority of the porous carbon material, so that the measuring table is strong in environmental adaptation and good in structural stability, and even if the surface of the bearing is scratched, the air floatation state of the working disc can be ensured due to millions of submicron-sized holes naturally occurring on the surface of the bearing. The air bearing is formed and processed by a die, and has simple process and low price.
In order to overcome the problems that a slender torsion bar is difficult to process and the linearity is poor, the scheme adopts the torsion spring type driving element, the torsion rigidity of the torsion spring type driving element is small, the linearity is good, and the swinging frequency of the whole system can be ensured not to be larger than 1Hz, so that the turntable can swing reliably.
A micro rotational inertia measuring device based on an air bearing comprises: the device comprises a working disc 1, an air-floating rotating shaft 2, an air-floating bearing 3, an air-floating bearing seat 4, a support frame 5, a base 6, a plane volute spring 9, a spring inner shaft 10, a photoelectric tube seat 13, an adjustable rotating needle 14, an angle limiting shaft 15, a horizontal adjusting pin 16, a spring fixing assembly 17 and a swing angle limiting assembly;
the spring fixing component 17 comprises a spring outer pressing block 11 and a spring mounting seat 12; the swing angle limiting assembly comprises an angle limiting outer ring 7 and an angle limiting inner ring 8;
the working disc 1 is arranged at the uppermost end of the measuring device; the lower end of the working disc 1 is provided with a groove, and the groove is matched with the upper end surface of the air floatation rotating shaft 2 and is rigidly connected with the upper end surface of the air floatation rotating shaft through a fastener;
the air floatation rotating shaft 2 is of a T-shaped rotary structure, the lower part of the air floatation rotating shaft is directly inserted into a working hole of the air floatation bearing 3, and the air floatation rotating shaft and the working hole are matched to enable the working disc 1 to be in a floating state; meanwhile, the lower end of the air floatation rotating shaft 2 is provided with a positioning hole, and the positioning hole is matched with an upper boss at the upper end of the spring inner shaft 10 and is rigidly connected with the upper boss through a screw;
the air bearing seat 4 is of a T-shaped rotary structure, the middle of the air bearing seat is provided with a mounting through hole for inserting the air bearing 3 into the air bearing seat, a threaded hole is formed in a boss at the upper part of the air bearing seat 4 and serves as a mounting hole of a support frame, the side surface of the air bearing seat 4 is provided with an air guide hole, and an air hose penetrates through the air guide hole to introduce air into the air bearing 3; meanwhile, a photoelectric tube seat mounting threaded hole is formed in the side surface of the air bearing seat 4;
the spring inner shaft 10 is divided into four sections from top to bottom, namely an upper boss, an adjustable rotating needle mounting section, a plane volute spiral spring mounting section and an angle limiting shaft mounting section; the adjustable rotating needle 14, the flat spiral spring 9 and the angle limiting shaft 15 are respectively and rigidly connected with the spring inner shaft 10 at corresponding sections;
the upper end of the support frame 5 is installed in a support frame installation hole of the air bearing seat 4 through a screw, and the lower end of the support frame 5 is rigidly connected with the base 6;
the base 6 is provided with a circular groove in the center and matched with the angle limiting outer ring 7, and the circular groove and the angle limiting outer ring are in rigid connection through bolts, so that the whole swing angle limiting assembly can rotate around an axis; a square through hole is formed in the position, close to the edge, of the base 6 and used for installing a spring installation seat 12; the three horizontal adjusting feet 16 are arranged on the base 6 through three threaded holes uniformly distributed on the base 6 and used for supporting the measuring device;
the angle limiting outer ring 7 is provided with a groove which is matched with the angle limiting inner ring 8, so that the two rings can do relative circular motion around an axis, meanwhile, the outer circumferences of the upper ends of the two rings are provided with stop blocks, the distance between the two stop blocks can be adjusted at will through the relative motion between the two rings, the angle limiting shaft 15 is arranged between the two stop blocks, and the swing angle and the limit position of the working disc can be adjusted through adjusting the positions of the angle limiting inner ring 7 and the angle limiting outer ring 8;
the spring mounting seat 12 is arranged in a square through hole of the base 6, the spring outer pressing block 11 is arranged above the spring mounting seat 12, and a gap is formed between the spring mounting seat 12 and the spring outer pressing block;
the photoelectric tube seat 13 is arranged on the side surface of the air bearing pedestal 4 through a photoelectric tube seat mounting threaded hole;
the adjustable pendulum pin 14 is provided with an open ring hole, and the adjustable pendulum pin 14 is screwed down through a bolt to clamp the spring inner shaft 10;
the inner ring of the flat spiral spring 9 is rigidly connected with the flat spiral spring mounting section of the inner spring shaft 10, and the outer ring of the flat spiral spring 9 extends into a gap between the outer spring pressing block 11 and the spring mounting seat 12 and is pressed and fixed by the outer spring pressing block 11 and the spring mounting seat 12.
Preferably, the air bearing 3 is made of porous carbon material, and a layer of uniform air film is formed on the surface of the porous carbon material substrate after ventilation by using millions of submicron holes in the porous carbon material substrate, so that the air floating rotating shaft 2 is kept in an air floating state.
Preferably, the working plate 1 is made of an aluminum alloy material, and is provided with three flanges which are uniformly distributed and arranged along the axis, so that a worker can conveniently stir the working plate 1 to fix the swing angle.
Preferably, the spring inner shaft 10 is made of aluminum alloy material.
Preferably, the flat spiral spring mounting section is of a semi-cylindrical structure, and the flat spiral spring 9 is pressed through a semi-cylindrical spring pressing block matched with the flat spiral spring mounting section.
Preferably, the spring mounting seat 12 can be adjusted in mounting height in the square through hole to facilitate the operation of the flat spiral spring 9.
The specific embodiment is as follows:
referring to fig. 1 and 2, a set of high-precision rotational inertia measuring device based on a porous carbon material air bearing is developed in the embodiment. The measuring device mainly comprises: the device comprises a working disc 1, an air-bearing seat 4, an air-bearing 3, an air-bearing rotating shaft 2, a spring inner shaft 10, a plane volute spring 9, an angle limiting shaft 15, an adjustable rotating needle 14, a photoelectric tube seat 13, a base 6, a support frame 5, a horizontal adjusting pin 16, a spring fixing assembly 17 and a swing angle limiting assembly, wherein the spring fixing assembly 17 comprises a spring mounting seat 12 and a spring outer pressing block 11, and the swing angle limiting assembly comprises an angle limiting inner ring 8 and an angle limiting outer ring 7. Wherein, the groove at the lower end of the working disc 1 is matched with the upper end surface of the air-floating rotating shaft 2 and is rigidly connected with the air-floating rotating shaft through a fastener. The air flotation rotating shaft 2 is directly inserted into a working hole of the air flotation bearing 3, the working disc 1 is in a floating state due to the cooperation of the air flotation rotating shaft and the air flotation bearing, and meanwhile, a positioning hole at the lower end of the air flotation rotating shaft 2 is in rigid connection with a boss at the upper end of the spring inner shaft 10 through a screw. The spring inner shaft 10 is provided with an adjustable rotating needle mounting section, a plane spiral spring mounting section and an angle limiting shaft mounting section at the same time. The adjustable rotating needle 14, the flat spiral spring 9 and the angle limiting shaft 15 are respectively and rigidly connected with the spring inner shaft 10 at corresponding sections. The boss of the air-bearing pedestal 4 is provided with a bracket mounting hole, the upper end of the support frame 5 is connected with the air-bearing pedestal 4 through a screw, and the lower end is rigidly connected with the base 6. Meanwhile, the air-floating bearing seat 4 is provided with an air guide hole and a mounting hole of a photoelectric tube seat 13, and the air guide hole guides the air hose to be connected with the air-floating bearing 3 to supply air to the air-floating bearing 3. The photoelectric tube seat 13 is arranged at the outer edge of the air bearing seat 4 through a mounting hole. The base 6 is provided with a circular groove in the center and is matched with the angle limiting outer ring 7, and the base and the angle limiting outer ring form rigid connection through bolts. The base 6 sets up square through hole at nearly circumference department, installation spring mount pad, and simultaneously, three level adjustment foot 16 is connected with base 6 through three evenly distributed's screw hole on the base 6.
The core part of this embodiment is air bearing 3, and this air bearing 3 adopts porous carbon material, utilizes the millions of submicron size's of natural occurrence in the substrate hole, forms the even air film of one deck on its surface after ventilating for the air supporting axis of rotation keeps the air supporting state, and the structure that this embodiment adopted is T type revolution mechanic, and its workspace is hole periphery and up end, because the rigidity and the stability of material make the working disc can bear great load.
The working plate 1 of this embodiment is formed by aluminum alloy material processing, is equipped with three flange respectively and arranges along the axle center equipartition, makes things convenient for personnel to stir working plate 1, fixed pivot angle.
The rotating shaft of the embodiment is divided into two parts, namely an air floatation rotating shaft 2 and a spring inner shaft 10, wherein the air floatation rotating shaft 2 is made of steel and is of a T-shaped rotary structure, the part matched with an air floatation bearing is a lower-section outer cylindrical surface and a lower end surface of a boss, and the two parts are precisely machined to ensure the surface roughness; the spring inner shaft 10 is made of aluminum alloy material, has a light structure and small rotational inertia, adopts a four-section structure and is divided into an upper boss, an adjustable pendulum pin mounting section, a plane spiral spring mounting section and an angle limiting shaft mounting section. In particular to a plane scroll spring mounting section, which is in a semi-cylindrical structure and compresses a spring through a semi-cylindrical spring pressing block matched with the section. The air flotation rotating shaft 2 and the spring inner shaft 10 are rigidly connected together up and down through a fastening piece, the structure reduces the processing requirement, the precision is easy to guarantee, the self rotational inertia of the device is further reduced, and the measurement is more accurate.
The adjustable pendulum pin 14 of the present embodiment is provided with an open-loop hole, and the adjustable pendulum pin 14 is tightened by a bolt to clamp the spring inner shaft 10, so that the adjustable pendulum pin 14 is allowed to be slightly adjusted before being fixed, and the adjustable pendulum pin 14 just passes through the action region of the photoelectric tube.
The swing angle limiting assembly of the present embodiment includes an angle limiting inner ring 8 and an angle limiting outer ring 7. The angle limiting outer ring 7 is provided with a groove which is matched with the angle limiting inner ring 8, so that the two rings can do relative circular motion around an axis, meanwhile, the outer circumference of the upper end of the two rings is provided with a stop dog, the gap between the two stop dogs can be adjusted freely through relative motion between the two rings, the angle limiting shaft 15 is just between the two stop dogs, and the swing angle and the limit position of the working disc can be adjusted through the angle limiting inner ring 7 and the angle limiting outer ring 8.
The power device of the embodiment is a flat spiral spring 9, an inner ring is rigidly connected with a spring inner shaft 10, and an outer ring is rigidly connected with a spring fixing component.
The base 6 of this embodiment is the disc type structure, and it has circular groove to open at the center, cooperates with the spacing outer loop 7 of angle for the spacing subassembly of angle is whole can rotate around the axis, passes through the spacing subassembly of bolt fastening angle at last.
The specific steps of measuring the moment of inertia in this embodiment are as follows:
1) the air pressure of the air compressor is adjusted and is connected with the air inlet of the air bearing 3, so that the air bearing 3 is in a safe working state.
2) And starting the measuring device, electrifying the photoelectric tube and checking that the hardware of the equipment works normally.
3) Measuring the period of oscillation of the operating disk 1 at no load: the working disk 1 is stirred to enable the working disk 1 to rotate to reach a set angle and then the working disk 1 is released, the working disk 1 and the adjustable pendulum pin 14 synchronously swing, the swing period of the adjustable pendulum pin 14 is measured through a photoelectric tube, and the no-load swing period T is recorded0。
4) Measuring the swing period after loading the standard component: placing the standard component on the working disk 1 according to the requirement, and then repeating the step 3), recording the swing period T for loading the standard componentbAnd removing the standard component.
5) Measuring the swing period after loading the piece to be measured: placing the piece to be tested on the working disc 1 as required, and then repeating the step 3), recording the swing period T for loading the piece to be testeddAnd taking down the piece to be detected.
6) The measuring equipment calculates the rotational inertia of the piece to be measured through the measured data, and the specific calculation formula is as follows:
IP＝Id-I0 (2)
wherein: k-spring rate
I-moment of inertia
T-period of oscillation
IdThe moment of inertia of the piece to be measured and the equipment itself
I0The moment of inertia of the apparatus itself
IP-moment of inertia of the part to be measured
Because the rotational inertia of the standard part is known, the rigidity coefficient of the spring can be calibrated, and the rotational inertia of the part to be measured is solved through a simultaneous formula.
In conclusion, the measuring device provided by the invention has the advantages of reliable work, simple operation and rapid measurement, stably balances the measurement error of the rotational inertia caused by friction, and improves the accuracy of measuring the rotational inertia of the micro object.
Claims (6)
1. A miniature inertia of rotation measuring device based on air supporting bearing, its characterized in that includes: the device comprises a working disc, an air flotation rotating shaft, an air flotation bearing seat, a support frame, a base, a flat spiral spring, a spring inner shaft, a photoelectric tube seat, an adjustable rotating needle, an angle limiting shaft, a horizontal adjusting pin, a spring fixing assembly and a swing angle limiting assembly;
the spring fixing assembly comprises a spring outer pressing block and a spring mounting seat; the swing angle limiting assembly comprises an angle limiting outer ring and an angle limiting inner ring;
the working disc is arranged at the uppermost end of the measuring device; the lower end of the working disc is provided with a groove, and the groove is matched with the upper end surface of the air floatation rotating shaft and is rigidly connected with the upper end surface of the air floatation rotating shaft through a fastener;
the air floatation rotating shaft is of a T-shaped rotary structure, the lower part of the air floatation rotating shaft is directly inserted into an air floatation bearing working hole, and the air floatation rotating shaft and the air floatation bearing working hole are matched to enable the working disc to be in a floating state; meanwhile, the lower end of the air floatation rotating shaft is provided with a positioning hole, and the positioning hole is matched with an upper boss at the upper end of the spring inner shaft and is rigidly connected with the upper boss through a screw;
the air floatation bearing block is of a T-shaped rotary structure, the middle of the air floatation bearing block is provided with a mounting through hole for inserting the air floatation bearing, a boss at the upper part of the air floatation bearing block is provided with a threaded hole as a mounting hole of a support frame, the side surface of the air floatation bearing block is provided with an air guide hole, and an air hose penetrates through the air guide hole to introduce air into the air floatation bearing; meanwhile, a photoelectric tube seat mounting threaded hole is formed in the side surface of the air bearing seat;
the spring inner shaft is divided into four sections from top to bottom, namely an upper boss, an adjustable rotating needle mounting section, a plane volute spiral spring mounting section and an angle limiting shaft mounting section; the adjustable rotating needle, the planar spiral spring and the angle limiting shaft are respectively and rigidly connected with the spring inner shaft at corresponding sections;
the upper end of the support frame is installed in a support frame installation hole of the air floatation bearing seat through a screw, and the lower end of the support frame is rigidly connected with the base;
the base is provided with a circular groove in the center and matched with the angle limiting outer ring, and the circular groove and the angle limiting outer ring are in rigid connection through bolts, so that the whole swing angle limiting assembly can rotate around an axis; the base is provided with a square through hole near the edge for mounting a spring mounting seat; the three horizontal adjusting feet are arranged on the base through three threaded holes which are uniformly distributed on the base and are used for supporting the measuring device;
the angle limiting outer ring is provided with a groove which is matched with the angle limiting inner ring, so that the two rings can do relative circular motion around an axis, meanwhile, the outer circumferences of the upper ends of the two rings are respectively provided with a stop block, the distance between the two stop blocks can be adjusted at will through the relative motion between the two rings, the angle limiting shaft is arranged between the two stop blocks, and the swing angle and the limit position of the working disc can be adjusted by adjusting the positions of the angle limiting inner ring and the angle limiting outer ring;
the spring mounting seat is mounted in the square through hole of the base, the spring outer pressing block is mounted above the spring mounting seat, and a gap is formed between the spring mounting seat and the spring outer pressing block;
the photoelectric tube seat is arranged on the side surface of the air bearing seat through a photoelectric tube seat mounting threaded hole;
the adjustable pendulum pin is provided with an open ring hole, and the adjustable pendulum pin is screwed down through a bolt to clamp the inner shaft of the spring;
the inner ring of the flat spiral spring is rigidly connected with the flat spiral spring mounting section of the spring inner shaft, and the outer ring of the flat spiral spring extends into a gap between the outer spring pressing block and the spring mounting seat and is pressed and fixed by the outer spring pressing block and the spring mounting seat.
2. The micro rotational inertia measuring device of claim 1, wherein the air bearing is made of a porous carbon material, and a uniform air film is formed on the surface of the porous carbon material by using millions of sub-micron holes in the porous carbon material, so that the air-floating rotating shaft is kept in an air-floating state.
3. The micro rotational inertia measuring device based on the air bearing as claimed in claim 1, wherein the working disc is made of aluminum alloy material, and has three flanges uniformly arranged along the axis, so that the working disc can be conveniently shifted and the swing angle can be fixed by a person.
4. The micro moment of inertia measurement device based on the air bearing as claimed in claim 1, wherein the inner spring shaft is made of aluminum alloy.
5. The micro rotational inertia measuring device of claim 1, wherein the flat spiral spring mounting section is a semi-cylindrical structure, and the flat spiral spring is pressed by a semi-cylindrical spring pressing block engaged with the flat spiral spring mounting section.
6. The micro rotational inertia measurement device of claim 1, wherein the spring mounting seat is adjustable in height within the square through hole to facilitate operation of the planar spiral spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123148067.4U CN216524560U (en) | 2021-12-14 | 2021-12-14 | Miniature rotational inertia measuring device based on air bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123148067.4U CN216524560U (en) | 2021-12-14 | 2021-12-14 | Miniature rotational inertia measuring device based on air bearing |
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