CN100453992C

CN100453992C - Precision balance measuring instrument

Info

Publication number: CN100453992C
Application number: CNB2005101062044A
Authority: CN
Inventors: 冯昌荣
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-09-17
Filing date: 2005-09-17
Publication date: 2009-01-21
Anticipated expiration: 2025-09-17
Also published as: CN1932463A

Abstract

A high precision traverse adjustment for measuring the imbalance quality of the rotating member is provided in the invention. It puts the magnetic canister into the bigger magnetic slot to suspend the magnetic canister by the repulsive force produced by the same polarity. The tested part is rotating with the magnetic canister droved by the cord or connected by the sleeve. So it can get the distribution and the magnitude of the imbalance quality according to the gravity sagged theory. So it can avoid the interface and improve the measuring precision.

Description

Precision balance measuring instrument

Technical field:

The present invention is a kind of equipment that is used to measure the unbalance mass, of rotary part, belongs to floated precision balance measuring equipment.

Technical background:

If the rotating object quality not with the turning axle symmetrical balance, then in rotation, can produce vibration.Many rotary parts such as wheel, flywheel, engine crankshaft, rotor etc. all need to carry out balancing a survey in the equipment of industrial product.And current balancing a survey technology, usually adopt rocker to support the force-measuring type structure firmly, though can reach very high precision, but to further improve precision, will face following problem: the manufacturing rigging error of rolling ball bearing and wearing and tearing can influence precision, rocker stiffness limits the signal amplitude of force transducer, rocker structure make and measure the fluctuation have blind area, belt tension and motor speed and constitute with frequently or near disturb frequently etc.Xian Jin national natural science fund subsidy project (50275100) comparatively; P.25-27, there is following problem again in the scheme that China Engineering Physics Research Institute's science and technology fund assistance project (20030326) " the two-sided vertical dynamic balance of air-flotation type high precision is measured " (loyal Yin Guofu Wang of author: Tao Ji method root) " Machine Design JOURNAL OF MACHINE DESIGN " 2004 Vol.21 No.9 are proposed: 1, still need drive unit, can cause interference equally.2, the precision of accurate control system of invariable pressure, sphere internal gas pressure field measurement and emulation is difficult to guarantee.3, the air supply system power consumption is big, and measuring speed is slow.Therefore, present technical scheme exists technology, the precision of equipment own low, the introducing that can't thoroughly avoid interference, and, measuring accuracy can't further be improved owing to measure the error that exists indirectly.

Summary of the invention:

For overcome prior art, the precision of equipment own low, introduce disturb many, measure the deficiencies of the error of existence indirectly, the invention provides a kind of precision balance measuring instrument, driving unit under test by the magnetcisuspension buoyancy aid freely rotates, the introducing that thoroughly avoids interference, equipment itself can carry out the high precision balance correction, adopt the method for directly measuring to reduce error greatly simultaneously, thereby greatly improve measuring accuracy.

Technical scheme: the technical solution adopted for the present invention to solve the technical problems is: be made up of uniform magnetic cylinder in magnetic field and circular arc magnetic groove, magnet material is kicker magnet such as rare earth kicker magnet, electromagnet, superconducting magnet, magnetic cylinder is placed on than in its big slightly magnetic groove, thereby magnetic cylinder outside polarity is identical and relative with the inboard polarity of magnetic groove thereby the generation mutual repulsion effect constitutes buoyant element.Preferred scheme is made up of two groups of identical magnetic cylinder and magnetic grooves of size, two magnetic cylinders support pipe by a small-bore lightweight and link together, wherein two magnetic cylinders and lightweight support the axial line of pipe on same horizontal linear, and with under the axis parallel of two magnetic grooves, magnetic cylinder can freely roll on non-resistance ground in the magnetic groove.The outer end of a magnetic cylinder connects the display disc with two perpendicular pointers therein, is fixing the index dial that an outside indicates scale with magnetic groove outer end on one side.On lightweight support pipe, rein in two groups of long light-high-strength looped cord, be used to drive unit under test.Under the magnetic cylinder axial line, be provided with a contactless marker such as laser marker.When magnet material was the rare earth kicker magnet, display disc, magnetic cylinder, lightweight support pipe, light-high-strength looped cord, unit under test did not have any contact with miscellaneous part.Unit under test can directly be socketed on two magnetic cylinders by the sleeve of suitable bore, or the two ends of having reined in turning axle with two groups of light-high-strength looped cord, if unit under test intermediate throughholes, then reined in from two ends by rope after the sleeve socket by suitable bore, unit under test freely rotates with magnetic cylinder under the drive of rope again.At this moment be equivalent to make unit under test to suspend.If there is unbalance mass, in unit under test, according to the sagging principle of center of gravity, when the rotation of unit under test is static when getting off, unbalance mass, is just under the parts axle center, behind its position of marker mark, rotate display disc 90 degree more gently, then unbalance mass, has also forwarded horizontal level to by the drive of rope, the eccentric torque of measuring this moment is the eccentric torque of unbalance mass, under action of gravity, according to formula: F (power) * S (distance)=F*S, F=G, G (gravity)=mg (g is an acceleration of gravity) can calculate the size that a certain eccentric distance S goes up unbalance mass.After repeatedly measuring, go heavily, when magnetic cylinder can be still on a plurality of diverse locations, amount of unbalance was zero in theory.Shed unit under test and can carry out the balance correction of equipment own, method is the same.Simultaneously, thus can be easily constitute balance and go to heavy system supporting below the pipe sectional fixture and cutting tool.

The invention has the beneficial effects as follows: measuring accuracy height, general experiment show, the least residue degree of unbalancedness reach 0.5 μ m (through measure, go for 3 to 4 times heavy after in theory amount of unbalance be zero), measurement range is wide, type is many (various complicated shape revolutions such as fan blade, propeller etc.), and it is few especially to consume energy, measuring speed is fast, noiselessness, environmental protection, modular design, expanded function is strong, simple in structure, move and tear open conveniently, production cost is low.

Description of drawings:

Fig. 1 is a schematic diagram

Fig. 2 is the left side view of embodiment one

Fig. 3 be embodiment one through the longitudinal profile of magnetic cylinder axial line structural map

Fig. 4 is right side view and magnetic baffle plate (7) the shape figure of embodiment one

Among the figure, 1. magnetic cylinder, 2. index dial, 3. display disc, 4. tube and pipe of aluminium alloy, 5. magnetic groove, 6. square tube pillar, 7. magnetic baffle plate, 8. magnetic cylinder bottom sealing plate, 9. steel plate type pointer, 10. marker guide rail, 11. laser marker, 12. annular nylon ropes

Embodiment:

Embodiment one, in Fig. 3, the identical magnetic field uniform rare earth kicker magnet magnetic cylinder (1) of two sizes is that 0.5 centimetre tube and pipe of aluminium alloy (4) links together by thickness of pipe, wherein the axial line of two magnetic cylinders (1) and tube and pipe of aluminium alloy (4) is on same horizontal linear, and with under the axis parallel of two semicircle magnetic grooves (5), magnetic cylinder (1) is placed on than in its big slightly magnetic groove (5), magnetic cylinder (1) outside polarity with magnetic groove (5) thus inboard polarity is identical and relatively thereby produce mutual repulsion effect formation buoyant element, magnetic cylinder (1) can freely roll on non-resistance ground in magnetic groove (5).One end of tube and pipe of aluminium alloy (4) stretches out magnetic cylinder bottom sealing plate (8) and fixes a display disc (3) endways, fixes a graduated collar (2) with magnetic groove (5) outer end on one side.As shown in Figure 1, it is the straight line of starting point for being drawn on the display disc, with the center of circle that display disc (3) is gone up pointer 1, and perpendicular to the steel plate type pointer (9) of being with scale.Establish an annular magnet baffle plate (7) in the inner of magnetic cylinder (1), be used for fixing magnetic cylinder (1) and tube and pipe of aluminium alloy (4), bear gravity.Fix an arc magnetic baffle plate (7) in magnetic groove (5) the inner, with magnetic baffle plate (7) pairing on the magnetic cylinder (1), both one side magnetic in opposite directions is identical, thereby produces repulsion, prevents magnetic cylinder (1) move left and right that suspends.Magnetic groove (5) divides three layers, and innermost layer is thick 2.6 centimetres an of ferromagnetic material, and the middle layer is every 0.1 centimetre of magnet steel thickness of slab, and outermost layer is 0.3 centimetre of ordinary steel thickness of slab and welds together with square tube pillar (6), is used to bear weight.Square tube pillar (6) is that 0.3 centimetre steel plate seam forms by thickness.The laser beam that marker guide rail (10) and laser marker (11) are sent is positioned under magnetic cylinder (1) axial line, and laser instrument marker (11) can move up and down on marker guide rail (10).Length, thickness, the position of annular nylon rope (12) can suitably be selected according to the survey object, in order to prevent to skid, also can on the one section tube and pipe of aluminium alloy (4) in the middle of two magnetic cylinders (1), stamp anti-skidding striped simultaneously respectively around a circle on the turning axle of the tube and pipe of aluminium alloy (4) and the object of surveying.

Measuring process: as shown in Figure 1, with the fasten turning axle at testee two ends of annular nylon rope (12), if the testee shaft core position is poroid, sleeve two ends more then fasten after the sleeve socket with suitable bore, testee freely rotates under the drive of the magnetic cylinder (1) that suspends, be equivalent to make testee to suspend, according to the sagging principle of center of gravity, when testee rotates static when getting off, unbalance mass, be positioned at the object axis of rotation under position A, pointer 1 points to scale A, steel plate type pointer (9) indicating graduation B at this moment.Behind mobile laser marker (11) mark, stirring display disc (3) gently makes pointer 1 point to scale B, then unbalance mass, turns to horizontal level B, the eccentric torque of this moment is the eccentric torque that unbalance mass, produces because of gravity, measure on the steel plate type pointer (9) of display disc (3), pressure F on a certain eccentric distance S perpendicular to steel plate type pointer (9), be the gravity G that unbalance mass, produces on eccentric distance S, can calculate the big or small m of unbalance mass, by G=mg (g is an acceleration of gravity).

Embodiment two, change the rare earth ferromagnetic material of magnetic cylinder and magnetic groove into electromagnet or superconducting magnet.Other is identical.

Claims

1, a kind of precision balance measuring instrument, belong to a kind of floated balancing a survey instrument, it is characterized in that: be placed on than in its big slightly circular arc magnetic groove by the uniform magnetic cylinder in magnetic field, the magnetic pole that magnetic cylinder is relative with the magnetic groove is identical, thereby producing mutual repulsion effect suspends magnetic cylinder, the jacket casing of unit under test by suitable bore is connected on the magnetic cylinder and drives, or by the looped cord drive of reining on magnetic cylinder support pipe, thereby unit under test is freely rotated, according to the sagging principle of free article for rotation center of gravity, when unit under test rotates static when getting off, unbalance mass, be positioned at unit under test turning axle axle center under, mark the position of its unbalance mass, by the contactless marker under the magnetic cylinder axial line, unbalance mass, turns to horizontal level after making unit under test rotate an angle of 90 degrees degree, the eccentric torque of measuring this moment is the eccentric torque that unbalance mass, produces because of gravity, and then calculates the size of unbalance mass, on a certain eccentric distance.