CN108956015B - Electromagnetic online dynamic balance system - Google Patents
Electromagnetic online dynamic balance system Download PDFInfo
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- CN108956015B CN108956015B CN201811124557.0A CN201811124557A CN108956015B CN 108956015 B CN108956015 B CN 108956015B CN 201811124557 A CN201811124557 A CN 201811124557A CN 108956015 B CN108956015 B CN 108956015B
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M1/00—Testing static or dynamic balance of machines or structures
- G01M1/14—Determining imbalance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses an electromagnetic type online dynamic balance system, which comprises a controller, a first balance disc, a second balance disc, a sucking disc type electromagnet braking locking device, a driving device and a balancing device, wherein the controller receives vibration information measured by a vibration measuring device and converts the vibration information into unbalance amount and phase of a base and a required balancing weight, and controls the sliding electromagnet braking locking device to leave the first balance disc and the second balance disc and controls the sucking disc type electromagnet driving device to drive the first balance disc and the second balance disc to rotate bidirectionally so that the balancing weight formed by vector synthesis of the first balance disc and the second balance disc is identical with the balancing weight required by the base, and the base is balanced. The electromagnetic on-line dynamic balance system has the advantages of simple structure, high control precision, high adjustment efficiency, small rotation step angle of the balance disc and high counterweight precision. And the axial dimension is small, and the device can be installed in a narrow space.
Description
Technical Field
The invention relates to an electromagnetic type on-line dynamic balance system, in particular to an electromagnetic type on-line dynamic balance system for a large-size grinding disc.
Background
Grinding is used as an ancient and modern precision machining method and is widely applied to precision machining of various materials such as metal and nonmetal material parts. In order to improve the processing efficiency, the size of the grinding disc is larger and larger, the diameter of the grinding disc of some large grinding machine tools is even more than two meters, the rotating speed is also higher and higher, and the rotating speed of some grinding machine tools reaches more than 500 r/min. However, such large-sized grinding disks may cause a certain amount of unbalance due to uneven mass distribution during the manufacture of the grinding disk and uneven abrasion of the grinding disk during the grinding process. At lower speeds, the unbalance amount has little effect on the machining process, however, when the speed is higher, the unbalance amount causes more serious vibrations, which in turn affect the quality of the ground workpiece. In particular, during precision grinding of brittle wafer parts such as photovoltaic substrates of sapphire, monocrystalline silicon, and silicon carbide, such vibrations can not only make it difficult to meet the precision requirements of the processed parts, but can even cause breakage of the parts. Thus, it is highly desirable to eliminate the unbalance of the grinding disc during the grinding process.
The balancing method of the disc or shaft parts is quite many, especially off-line static balancing and dynamic balancing methods, although the off-line balancing method can adjust unbalance amount of the disc or shaft parts to a certain extent, certain problems exist, on one hand, when the off-line balanced disc or shaft parts are mounted on a machine tool, certain unbalance amount is caused; on the other hand, certain unbalance amount can be caused by uneven wear of parts or uneven factors of loaded load in the using process. Therefore, in machine tools and machining with high precision requirements, online measurement and online dynamic balance are required.
Compared with the traditional off-line dynamic balance, the on-line dynamic balance has very remarkable advantages, is more and more focused by expert students in recent years, and a plurality of on-line dynamic balance methods, such as mechanical on-line dynamic balance, hydraulic on-line dynamic balance, electromechanical on-line dynamic balance and the like, are proposed, however, the on-line dynamic balance methods often have the problems of low balance precision, low adjustment speed, small balance quantity and the like. Therefore, the online dynamic balance technology with high precision and rapid adjustment is highly demanded, and particularly, the online dynamic balance technology aims at the precision of the grinding disc of the large-scale precision grinding machine tool.
Disclosure of Invention
The invention provides an electromagnetic on-line dynamic balance system, which overcomes the defects in the background technology. The technical scheme adopted for solving the technical problems is as follows:
electromagnetic type on-line dynamic balance system, its characterized in that: it comprises the following steps:
the base is rotatably connected to the machine;
the first balance disc and the second balance disc are respectively provided with an unbalance amount, and can independently rotate relative to the base;
the sucking disc type electromagnet driving device is used for driving the first balance disc and the second balance disc to rotate forwards or reversely relative to the base and is arranged on the base;
the push-pull electromagnet braking locking device is used for braking the first balance disc and the second balance disc so that the balance discs can be fixed relative to the base and is arranged on the base;
the vibration measuring device is used for measuring the vibration information of the base, is fixed on the machine table and corresponds to the base;
and the controller is electrically connected with the vibration measuring device, the sucker type electromagnet driving device and the push-pull type electromagnet braking locking device, receives vibration information measured by the vibration measuring device, converts the vibration information into unbalance amount and phase of the base and required balance weight, controls the push-pull type electromagnet braking locking device to leave the first balance disc and the second balance disc, controls the sucker type electromagnet driving device to drive the first balance disc and the second balance disc to rotate in a bidirectional mode, and enables the balance weight formed by vector synthesis of the first balance disc and the second balance disc to be identical with the balance weight required by the base so as to balance the base.
In a preferred embodiment: the first balance disc and the second balance disc are arranged up and down, a first bearing and a second bearing are further arranged, the base comprises a base body, the top surface of the base body is provided with a lantern ring in an upward protruding mode, the second balance disc is sleeved outside the lantern ring, the second bearing is connected with the top surface of the base body and the second balance disc, and the first balance disc is sleeved outside the lantern ring and is connected with the second balance disc through the first bearing.
In a preferred embodiment: the device further comprises a first shaft sleeve and a second shaft sleeve, wherein the second shaft sleeve is sleeved outside the sleeve ring and is propped between the sleeve ring and the second balance disc, and the first shaft sleeve is sleeved outside the sleeve ring and is propped between the sleeve ring and the first balance disc.
In a preferred embodiment: the push-pull electromagnet braking locking device comprises a fixing frame, a first push-pull electromagnet, a second push-pull electromagnet, a first braking block, a second braking block, a first friction plate and a second friction plate, wherein the fixing frame is fixedly arranged on a base, the first push-pull electromagnet and the second push-pull electromagnet are both arranged on the fixing frame at intervals up and down, the first braking block and the second braking block are respectively connected with the first push-pull electromagnet and the second push-pull electromagnet and respectively move between a locking position and a releasing position, the first friction plate and the second friction plate are respectively fixedly connected with the first braking block and the second braking block and respectively correspond to the first balance disc and the second balance disc, the first push-pull electromagnet and the second push-pull electromagnet respectively drive the first braking block and the second braking block to move from the locking position to the releasing position so that the first friction plate and the second friction plate respectively leave the first balance disc and the second balance disc, and the first push-pull electromagnet and the second braking block are respectively driven to move from the first braking block and the second balance disc to the releasing position when the first push-pull electromagnet and the second push-pull electromagnet are powered off.
In a preferred embodiment: the first brake block and the second brake block are of semi-I-shaped structures, and the first friction plate and the second friction plate are made of polyethylene materials.
In a preferred embodiment: the push-pull electromagnet braking locking device further comprises a first guide seat and a second guide seat which are connected with the fixing frame and are arranged up and down, the first guide seat and the second guide seat are respectively provided with a first guide groove and a second guide groove, and the first brake block and the second brake block are respectively in sliding fit with the first guide groove and the second guide groove.
In a preferred embodiment: the sucking disc formula electromagnet drive arrangement includes support, first sucking disc formula electromagnet and second sucking disc formula electromagnet, and the support rigid coupling is on the base member, and first sucking disc formula electromagnet and second sucking disc formula electromagnet are all installed on the support and upper and lower interval arrangement and respectively correspond with first balance dish and second balance dish.
In a preferred embodiment: the vibration measuring device comprises a mounting frame and an eddy current sensor, and the mounting frame is fixed on the machine table; the base also comprises a measuring disc fixedly connected with the base body, a first measuring groove is formed in the peripheral surface of the measuring disc, the eddy current sensor is fixedly connected with the mounting frame, and a probe of the eddy current sensor can correspond to the first measuring groove.
In a preferred embodiment: the electric vortex sensor is equipped with two, and the mounting bracket is L shape, and two electric vortex sensor install respectively at mounting bracket both ends, and measure the dish bottom and seted up the second and measure the recess, and the electric vortex sensor probe that is located the below can be corresponding with the second and measure the recess.
In a preferred embodiment: the push-pull type electromagnet braking and locking devices are provided with two groups and are axially symmetrical, and each group of push-pull type electromagnet braking and locking devices comprises five push-pull type electromagnet braking and locking devices; the sucker type electromagnet driving devices are provided with two groups and are axially and symmetrically arranged, and each group of sucker type electromagnet driving devices comprises twenty sucker type electromagnet driving devices; the two groups of sucker type electromagnet driving devices and the two groups of push-pull type electromagnet braking locking devices enclose a ring shape.
Compared with the background technology, the technical proposal has the following advantages:
1. the electromagnetic online dynamic balance system adopts a double-counterweight fixed radius polar coordinate mode, the principle is as shown in fig. 14, the two counterweights are fixed counterweights with the mass of M and the radius of R, the balance mass with the minimum of 0 and the maximum of 2MR can be provided in a 360-degree range by changing the phases of the two counterweights, the balance mass is O when the relative included angle is 180 degrees, and the balance mass is 2MR when the relative included angle is 0.
From this, first balance dish and second balance dish are equivalent to two balancing weights, detect the vibration information of base through vibration measuring device, the controller converts into unbalance size, phase place and the required counter weight of base after receiving this signal, control push-pull electromagnet braking locking device again and leave first balance dish and second balance dish and make two balance dishes can free rotation, then the controller control sucking disc formula electromagnet drive arrangement drives two-way rotation of first balance dish and second balance dish so that first balance dish and second balance dish pass through the counter weight that vector synthesis formed and the required counter weight of base the same and then make the base reach the balance. The vibration measuring device detects vibration information of the base again and transmits the vibration information to the controller, and after the controller judges that the base meets the balance requirement, the controller controls the push-pull electromagnet brake locking device to lock the first balance disc and the second balance disc so that the two balance discs are relatively fixed on the base, namely, the base can drive the two balance discs to synchronously rotate when rotating. The adjustment of one-time online dynamic balance is completed, and when the vibration measuring device detects that the base has unbalance again, the control process is repeated.
The electromagnetic on-line dynamic balance system has the advantages of simple structure, high control precision, high adjustment efficiency, small rotation step angle of the balance disc and high counterweight precision. And the axial dimension is small, and the device can be installed in a narrow space.
2. Because the first balance disc and the second balance disc Heng Pan are connected only through the first bearing and the second bearing respectively, the braking locking effect of the push-pull electromagnet braking locking device on the first balance disc and the second balance disc is better.
3. The first brake block and the second brake block are of a half-I-shaped structure, so that no redundant contact exists between the two brake blocks and the two balance discs; the first friction plate and the second friction plate are made of polyethylene, so that friction force is enough.
4. The mounting bracket is L shape, and two eddy current sensor install respectively at two tip of mounting bracket, and measure the dish bottom and seted up the second and measure the recess, and the eddy current sensor probe that is located the below can be corresponding with the second and measure the recess, combines the key to measure mutually, through two eddy current sensor that become 90 degrees each other, can very convenient obtain the axial vibration and the radial vibration of big mill.
5. The push-pull type electromagnet braking locking device is provided with two groups of axially symmetrical, so that the rotation of the first balance disc and the second balance disc is more stable and reliable; the sucker type electromagnet driving device is provided with two groups and is axially symmetrically arranged, so that the locking effect is better when the first balance disc and the second balance disc are locked by braking.
Drawings
The invention is further described below with reference to the drawings and examples.
FIG. 1 is a schematic diagram showing the overall structure of an electromagnetic online dynamic balance system according to a preferred embodiment.
FIG. 2 is a schematic diagram showing the overall structure of an electromagnetic online dynamic balance system according to a preferred embodiment.
FIG. 3 is a schematic cross-sectional view of an electromagnetic online dynamic balance system according to a preferred embodiment.
Fig. 4 shows a partial enlarged view of fig. 3.
Fig. 5 shows an exploded perspective view of an electromagnetic on-line dynamic balance system.
Fig. 6 shows an exploded view of the first balance disc, the first sleeve and the first bearing.
Fig. 7 shows an exploded schematic view of the second balance disc, the second bushing and the second bearing.
Fig. 8 shows a schematic assembly of the suction cup type electromagnet drive device and two balancing disks.
Fig. 9 shows an assembly schematic of the push-pull electromagnet brake locking device and the first balance disc.
Fig. 10 shows an exploded view of the suction cup type electromagnet drive device.
Fig. 11 shows a schematic structural diagram of a push-pull electromagnet brake locking device.
Fig. 12 is a schematic diagram showing an exploded structure of the push-pull type electromagnet brake locking device.
Fig. 13 is a schematic front view of the vibration measuring apparatus.
Fig. 14 shows a schematic diagram of a dual counterweight fixed radius polar coordinate.
Detailed Description
Referring to fig. 1 to 14, a preferred embodiment of an electromagnetic online dynamic balance system includes a base, a first balance disc 10, a second balance disc 20, a sucker type electromagnet driving device, a push-pull type electromagnet brake locking device, a vibration measuring device and a controller.
The base is rotatably mounted on the machine.
In this embodiment, the base includes a base 30, and a collar 31 is protruding upward from the top surface of the base 30.
In this embodiment, the base further includes a measuring disc 40 fixedly connected to the base 30, and a first measuring groove 41 is formed on the outer peripheral surface of the measuring disc 40. As shown in fig. 2, the measuring disk 40 is fixedly connected to the lower bottom surface of the base 30, and a second measuring groove (not shown) is formed in the bottom surface of the measuring disk 40.
The first balance disk 10 and the second balance disk 20 each have an unbalance amount, and the first balance disk 10 and the second balance disk 20 each can be rotated individually with respect to the base.
In this embodiment, the first balancing disk 10 and the second balancing disk 20 are disposed up and down, and further provided with a first bearing 11 and a second bearing 21, the second balancing disk 20 is sleeved outside the collar 31, the second bearing 21 is connected to the top surface of the base 30 and the second balancing disk 20, and the first balancing disk 10 is sleeved outside the collar 31 and connected to the second balancing disk 20 through the first bearing 11.
In this embodiment, the first shaft sleeve 12 and the second shaft sleeve 22 are further included, the second shaft sleeve 22 is sleeved outside the collar 31 and abuts against the collar 31 and the second balance disc 20, and the first shaft sleeve 12 is sleeved outside the collar 31 and abuts against the collar 31 and the first balance disc 10.
In this embodiment, the first balance disc 10 and the second balance disc 20 each have a part of the mass cut off to form a turntable with an unbalance amount, and the balance masses of different sizes are generated by adjusting the phases of the first balance disc 10 and the second balance disc 20. Specifically, the first and second grooves 13 and 23 having gradually changed depths may be formed at the bottom surfaces of the first and second balance plates 10 and 20, respectively, so that the first and second balance plates 10 and 20 have different weights and unbalance amounts.
As shown in fig. 6 and 7, the first and second balance plates 10 and 20 are provided at outer circumferences thereof with first and second tooth grooves 14 and 24, respectively, the first tooth grooves 14 are annularly spaced along the outer circumference of the first balance plate 10, and the second tooth grooves 24 are annularly spaced along the outer circumference of the second balance plate 20. Preferably, the first and second slots 14, 24 are the same size, shape, and number.
The suction cup type electromagnet driving device is used for driving the first balance disc 10 and the second balance disc 20 to rotate forwards or reversely relative to the base, and is arranged on the base.
In this embodiment, the suction cup type electromagnet driving device includes a bracket 100, a first suction cup type electromagnet 110 and a second suction cup type electromagnet 120, wherein the bracket 100 is fixedly connected to the base 30, and the first suction cup type electromagnet 110 and the second suction cup type electromagnet 120 are both mounted on the bracket 100 and are arranged at intervals up and down and respectively correspond to the first balance disc 10 and the second balance disc 20.
As shown in fig. 8 and 10, the bracket 100 is in an L shape, the short side section of the L-shaped bracket 100 is locked with the top surface of the base 30 by a screw, and the first suction cup type electromagnet 110 and the second suction cup type electromagnet 120 are arranged at the long side section of the L-shaped bracket 100 at intervals up and down and are locked with the long side section of the L-shaped bracket 100 by a screw.
In this embodiment, the sucker type electromagnet driving device is provided with two groups and is axially symmetrically arranged, and each group of sucker type electromagnet driving device comprises twenty sucker type electromagnet driving devices.
The operating principle of the sucker type electromagnet driving device is as follows: energizing the two suction cup electromagnets to generate magnetism to drive the first balance disc 10 and the second balance disc 20 to rotate forward or backward to adjust the phases of the two balance discs; the first balance disk 10 and the second balance disk 20 stop rotating when the first suction cup type electromagnet 110 and the second suction cup type electromagnet 120 are powered off.
The push-pull electromagnet brake locking device is used for braking the first balance disc 10 and the second balance disc 20 so that the balance discs can be relatively fixed with the base, and is arranged on the base.
In this embodiment, the push-pull electromagnet braking locking device includes a fixing frame 200, a first push-pull electromagnet 210, a second push-pull electromagnet 220, a first brake pad 230, a second brake pad 240, a first friction plate 250 and a second friction plate 260, where the fixing frame 200 is fixedly attached to a base, the first push-pull electromagnet 210 and the second push-pull electromagnet 220 are both installed on the fixing frame 200 and are arranged at intervals, the first brake pad 230 and the second brake pad 240 are respectively connected with the first push-pull electromagnet 210 and the second push-pull electromagnet 220 and both move between a locking position and a releasing position, the first friction plate 250 and the second friction plate 260 are respectively fixedly connected to the first brake pad 230 and the second brake pad 240 and respectively correspond to the first balance disc 10 and the second balance disc 20, when the first push-pull electromagnet 210 and the second push-pull electromagnet 220 are powered on, the first brake pad 230 and the second brake pad 240 are respectively driven from the locking position to the releasing position so that the first friction plate 250 and the second friction plate 260 are respectively separated from the first balance disc 10 and the second balance disc 20, and the second brake pad 260 are respectively driven by the first push-pull electromagnet 210 and the second brake pad 260 to the first balance disc 20 and the second brake pad 20.
In this embodiment, the first brake pad 230 and the second brake pad 240 are both in a half-i-shaped structure, each push-pull type electromagnet brake locking device is provided with two first friction plates 250 and two second friction plates 260, the two first friction plates 250 are respectively and fixedly connected at two protrusions of the half-i-shaped first brake pad 230, and the two second friction plates 260 are respectively and fixedly connected at two protrusions of the half-i-shaped second brake pad 240.
In this embodiment, the first friction plate 250 and the second friction plate 260 are made of polyethylene.
In this embodiment, the push-pull electromagnet brake locking device further includes a first guide seat 270 and a second guide seat 280, which are both connected to the fixing frame 200 and are arranged up and down, the first guide seat 270 and the second guide seat 280 are respectively provided with a first guide groove 271 and a second guide groove 281, and the first brake block 230 and the second brake block 240 are respectively in sliding fit with the first guide groove 271 and the second guide groove 281.
In this embodiment, the push-pull electromagnet brake locking device further includes two first magnetic sheet frames 290, two first magnetic sheet frames 291, two second magnetic sheet frames 292, and two second magnetic sheets 293, as shown in fig. 11, the first magnetic sheet frames 290 are fixedly connected to the inner side surface of the first guide seat 270 and are close to the first push-pull electromagnet 210, and the two first magnetic sheets 291 are fixedly connected to the two first magnetic sheet frames 290 and are located between the first magnetic sheet frames 290 and the first guide seat 270; the second magnetic sheet frame 292 is fixedly connected to the inner side surface of the second guide seat 280 and is close to the second push-pull electromagnet 220, and two second magnetic sheets 293 are fixedly connected to the two second magnetic sheet frames 292 respectively and are located between the second magnetic sheet frames 292 and the second guide seat 280.
Because the push-pull electromagnet belongs to a pure wire electrical appliance, the working resistance is small, and the electromagnet is easy to burn out after long-time energization, the push-pull electromagnet brake locking device is further provided with a first magnetic sheet 291 and a second magnetic sheet 293, and when the first brake block 230 and the second brake block 240 need to be quickly retracted from the locking position to the releasing position, the first push-pull electromagnet 210 and the second push-pull electromagnet 220 are electrified with large current; and when the first and second brake pads 230 and 240 are located at the release position, the first and second push- pull electromagnets 210 and 220 are energized with a low current to ensure that the first and second brake pads 230 and 240 remain at the release position by the weak electromagnetic force generated by the first and second magnetic sheets 291 and 293.
In this embodiment, the push-pull electromagnet brake locking device is provided with two groups of axially symmetrical push-pull electromagnet brake locking devices, and each group of push-pull electromagnet brake locking devices comprises five push-pull electromagnet brake locking devices. The two groups of sucking disc type electromagnet driving devices and the two groups of push-pull type electromagnet braking and locking devices enclose a ring shape, and the sum of the numbers of the sucking disc type electromagnet driving devices and the push-pull type electromagnet braking and locking devices is the same as the number of the first tooth grooves 14 and corresponds to the number of the first tooth grooves one by one. When the first and second brake shoes 230 and 240 are moved from the released position to the locked position, the first and second brake shoes 230 and 240 extend into the first and second tooth slots 14 and 15, respectively, such that the first and second friction plates 250 and 260 compress the walls of the first and second tooth slots 14 and 24, respectively.
The vibration measuring device is used for measuring vibration information of the base, and is fixed on the machine table and corresponds to the base.
And the controller is electrically connected with the vibration measuring device, the sucker type electromagnet driving device and the push-pull type electromagnet braking and locking device, receives vibration information measured by the vibration measuring device, converts the vibration information into unbalance amount and phase of the base and required balance weight, controls the push-pull type electromagnet braking and locking device to leave the first balance disc 10 and the second balance disc 20, controls the sucker type electromagnet driving device to drive the first balance disc 10 and the second balance disc 20 to rotate bidirectionally so that the balance weight formed by vector synthesis of the first balance disc 10 and the second balance disc 20 is identical with the balance weight required by the base, and further enables the base to be balanced.
In this embodiment, the vibration measuring device includes a mounting frame 300 and an eddy current sensor 310, where the mounting frame 300 is fixed on a machine table; the eddy current sensor 310 is fixedly connected to the mounting frame 300, and a probe of the eddy current sensor 310 can correspond to the first measuring groove 41.
In this embodiment, two eddy current sensors 310 are provided, the mounting frame 300 is L-shaped, the two eddy current sensors 310 are respectively mounted at two ends of the mounting frame 300, and the probe of the eddy current sensor 310 located below can correspond to the second measuring groove.
The eddy current sensor 310 converts the vibration characteristics of the base, such as acceleration, displacement, etc., into an electrical signal, and the electrical signal is amplified step by an amplifying circuit and then transmitted to a controller for analysis, so as to obtain three vibration elements:
the amplitude can reflect the amplitude of vibration of the processed parts on one hand, and is an important factor influencing the high-precision processing of the machine tool. On the other hand, the magnitude of the vibration energy is reflected, and a proper functional range can be provided.
The vibration frequency refers to the number of times of vibration of a machine tool component in unit time, and the excitation force source of the machine tool can be further obtained through research.
Vibration phase, which is a vector, needs to obtain its exact position, not only its magnitude but also its direction. In the process of measuring the unbalance amount, the method is mainly used for reflecting the position where the unbalance amount exists.
By processing and analyzing the vibration signal, we can obtain vibration displacement, velocity and acceleration very easily. By deriving the vibration displacement function, the vibration velocity can be obtained. And the vibration acceleration can be obtained by deriving the vibration speed. The specific formula is shown as follows:
vibration displacement: x (t) =asinωt
Vibration speed:
vibration acceleration:
/>
in this embodiment, the vibration measuring device adopts the key phase measurement, when the first measuring groove 41 and the second measuring groove of the base rotate to respectively correspond to the two eddy current sensor 310 probes, the distance between the base and the eddy current sensor 310 will be suddenly changed, and at this time, the eddy current sensor 310 will generate a pulse signal. A pulse signal is generated every time the susceptor rotates. Since the signal of the eddy current sensor 310 changes depending on the change of the distance between the sensor and the base, the radial vibration of the base can be detected in real time by the cooperation of the first measuring groove 41 and one of the eddy current sensors 310 during the rotation of the base, and the axial vibration of the base can be detected in real time by the cooperation of the second measuring groove and the other eddy current sensor 310. The rotation speed of the base can be obtained by counting the pulse signals, and the unbalance amount of the base can be obtained by analyzing the time difference between the vibration signal and the key pulse.
The working principle of the online dynamic balancing device is as follows:
when the base rotates normally, the first brake block 230 and the second brake block 240 of the push-pull electromagnet device are positioned at locking positions and are respectively positioned in the first tooth groove 14 and the second tooth groove 24, the first friction plate 250 and the second friction plate 260 press the groove wall of the first tooth groove 14 and the groove wall of the second tooth groove 24, and the first balance disc 10 and the second balance disc 20 rotate synchronously along with the rotation of the base under the action of the push-pull electromagnet device; at this time, the first push-pull electromagnet 210 and the second push-pull electromagnet 220 are in a power-off state;
when the two eddy current sensors 310 detect the unbalance amount of the base, the controller controls the push-pull electromagnet device to energize the first push-pull electromagnet 210 and the second push-pull electromagnet 220 to move the first brake pad 230 and the second brake pad 240 out of the first tooth slot 14 and the second tooth slot 24 to a released state, so that the first friction plate 250 and the second friction plate 260 are separated from the first balance disc 10 and the second balance disc 20, respectively, and the first balance disc 10 and the second balance disc 20 are in a freely rotatable state; next, the controller controls the suction cup type electromagnet device to energize the first suction cup type electromagnet 210 and the second suction cup type electromagnet 220, the first balance disc 10 and the second balance disc 20 rotate forward or backward under the action of the first suction cup type electromagnet 210 and the second suction cup type electromagnet 220 respectively to adjust the phases thereof, until the required balance amount is reached through vector synthesis, the controller de-energizes the first suction cup type electromagnet 210 and the second suction cup type electromagnet 220, and the first balance disc 10 and the second balance disc 20 stop rotating; then, the controller controls the first push-pull electromagnet 210 and the second push-pull electromagnet 220 to be powered off, so that the first brake pad 230 and the second brake pad 240 move from the release position to the locking position under the action of the elastic members inside the first push-pull electromagnet 210 and the second push-pull electromagnet 220 to enable the first balance disc 10 and the second balance disc 20 to rotate synchronously with the base, and at this time, one online dynamic balance is completed.
When the unbalance amount of the system is overlarge next time, the steps are repeated to realize the second dynamic balance.
The foregoing description is only illustrative of the preferred embodiments of the present invention, and therefore should not be taken as limiting the scope of the invention, for all changes and modifications that come within the meaning and range of equivalency of the claims and specification are therefore intended to be embraced therein.
Claims (3)
1. Electromagnetic type on-line dynamic balance system, its characterized in that: it comprises the following steps:
the base is rotatably connected to the machine;
the first balance disc and the second balance disc are respectively provided with an unbalance amount, and can independently rotate relative to the base;
the sucking disc type electromagnet driving device is used for driving the first balance disc and the second balance disc to rotate forwards or reversely relative to the base and is arranged on the base;
the push-pull electromagnet braking locking device is used for braking the first balance disc and the second balance disc so that the balance discs can be fixed relative to the base and is arranged on the base;
the vibration measuring device is used for measuring the vibration information of the base, is fixed on the machine table and corresponds to the base;
the controller is electrically connected with the vibration measuring device, the sucker type electromagnet driving device and the push-pull type electromagnet braking and locking device, receives vibration information measured by the vibration measuring device, converts the vibration information into unbalance amount and phase of the base and required balance weight, controls the push-pull type electromagnet braking and locking device to leave the first balance disc and the second balance disc, controls the sucker type electromagnet driving device to drive the first balance disc and the second balance disc to rotate in a bidirectional mode, and enables the balance weight formed by vector synthesis of the first balance disc and the second balance disc to be identical with the balance weight required by the base so as to balance the base;
the first balance disc and the second balance disc are arranged up and down, a first bearing and a second bearing are additionally arranged, the base comprises a base body, the top surface of the base body is convexly provided with a lantern ring, the second balance disc is sleeved outside the lantern ring, the second bearing is connected with the top surface of the base body and the second balance disc, and the first balance disc is sleeved outside the lantern ring and is connected with the second balance disc through the first bearing;
the first shaft sleeve is sleeved outside the collar and is abutted between the collar and the first balance disc;
the push-pull electromagnet braking locking device comprises a fixing frame, a first push-pull electromagnet, a second push-pull electromagnet, a first braking block, a second braking block, a first friction plate and a second friction plate, wherein the fixing frame is fixedly arranged on a base, the first push-pull electromagnet and the second push-pull electromagnet are both arranged on the fixing frame and are arranged at intervals up and down, the first braking block and the second braking block are respectively connected with the first push-pull electromagnet and the second push-pull electromagnet and respectively move between a locking position and a releasing position, the first friction plate and the second friction plate are respectively fixedly connected with the first braking block and the second braking block and respectively correspond to the first balance disc and the second balance disc, the first push-pull electromagnet and the second push-pull electromagnet respectively drive the first braking block and the second braking block to move from the locking position to the releasing position so that the first friction plate and the second friction plate respectively leave the first balance disc and the second balance disc when the first push-pull electromagnet and the second push-pull electromagnet are powered off, and respectively drive the first braking block and the second braking block to move from the position to the first balance disc and the second balance disc to be respectively pressed down;
the push-pull electromagnet braking locking device further comprises a first guide seat and a second guide seat which are connected with the fixed frame and are arranged up and down, the first guide seat and the second guide seat are respectively provided with a first guide groove and a second guide groove, and the first brake block and the second brake block are respectively in sliding fit with the first guide groove and the second guide groove;
the sucking disc type electromagnet driving device comprises a bracket, a first sucking disc type electromagnet and a second sucking disc type electromagnet, wherein the bracket is fixedly connected to the base body, and the first sucking disc type electromagnet and the second sucking disc type electromagnet are both arranged on the bracket, are vertically arranged at intervals and respectively correspond to the first balance disc and the second balance disc;
the vibration measuring device comprises a mounting frame and an eddy current sensor, and the mounting frame is fixed on the machine table; the base also comprises a measuring disc fixedly connected to the base body, a first measuring groove is formed in the peripheral surface of the measuring disc, the eddy current sensor is fixedly connected to the mounting frame, and a probe of the eddy current sensor can correspond to the first measuring groove;
the electric vortex sensor is equipped with two, and the mounting bracket is L shape, and two electric vortex sensor install respectively at mounting bracket both ends, and measure the dish bottom and seted up the second and measure the recess, and the electric vortex sensor probe that is located the below can be corresponding with the second and measure the recess.
2. The electromagnetic on-line dynamic balance system of claim 1, wherein: the first brake block and the second brake block are of semi-I-shaped structures, and the first friction plate and the second friction plate are made of polyethylene materials.
3. The electromagnetic on-line dynamic balance system according to any one of claims 1 to 2, characterized in that:
the push-pull type electromagnet braking and locking devices are provided with two groups and are axially symmetrical, and each group of push-pull type electromagnet braking and locking devices comprises five push-pull type electromagnet braking and locking devices; the sucker type electromagnet driving devices are provided with two groups and are axially and symmetrically arranged, and each group of sucker type electromagnet driving devices comprises twenty sucker type electromagnet driving devices; the two groups of sucker type electromagnet driving devices and the two groups of push-pull type electromagnet braking locking devices enclose a ring shape.
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| CN109470410A (en) * | 2019-01-14 | 2019-03-15 | 北京航空航天大学 | Symmetrical counterweight planetary gear train dynamic balance adjusting apparatus |
| CN113432789B (en) * | 2021-06-30 | 2024-04-02 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | Online testing device and method for dynamic balance weight of rotary machine |
| CN113514191B (en) * | 2021-09-14 | 2021-11-16 | 南通际维机电设备有限公司 | Regulation type automobile tire dynamic balance detects machine |
| TWI797811B (en) * | 2021-11-04 | 2023-04-01 | 國立中央大學 | Dynamic balancing system |
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