CN1095804A - The equipment for inhibiting of vibration of solid of rotation - Google Patents

The equipment for inhibiting of vibration of solid of rotation Download PDF

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Publication number
CN1095804A
CN1095804A CN94103256A CN94103256A CN1095804A CN 1095804 A CN1095804 A CN 1095804A CN 94103256 A CN94103256 A CN 94103256A CN 94103256 A CN94103256 A CN 94103256A CN 1095804 A CN1095804 A CN 1095804A
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China
Prior art keywords
rotation
axle
solid
group
vibration
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CN94103256A
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Chinese (zh)
Inventor
加藤一路
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Shinko Electric Co Ltd
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Shinko Electric Co Ltd
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Publication of CN1095804A publication Critical patent/CN1095804A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
    • F16F15/18—Suppression of vibrations in rotating systems by making use of members moving with the system using electric, magnetic or electromagnetic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C39/00—Relieving load on bearings
    • F16C39/06—Relieving load on bearings using magnetic means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/08—Structural association with bearings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
    • H02K7/16—Structural association with mechanical loads, e.g. with hand-held machine tools or fans for operation above the critical speed of vibration of the rotating parts

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Electromagnetism (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Vibration Prevention Devices (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

The present invention adopts following formation in order to reduce the natural vibration of accompanying rotation significantly.Magnetic pole 11 with radial configuration has been installed on axle 1 1-11 8A yoke 11, on each magnetic pole of these magnetic poles, twining coil 13 respectively 1-13 8, the coil 13 on these magnetic poles 1With 13 2, 13 3With 13 4, 13 5With 13 6, 13 7With 13 8Be connected in series respectively.By detector 14 x, 14 yDetect the x of the reference value of 12 of yoke 11 of contrast and secondary yokes, the displacement amount on the y direction respectively, for eliminating the current value that this displacement amount determines to supply with coil.

Description

The equipment for inhibiting of vibration of solid of rotation
The present invention relates to for example use equipment for inhibiting of vibration at the suitable solid of rotation of fiber machinery high speed motor.
Below with reference to Fig. 7 motor in the prior art is described, particularly use high-speed motor in fiber machinery structure.Motor shown in this figure makes the outer rotor motor of cylindric cylinder 2 rotations of basic hollow for the axle 1 that is fixed with respect to two ends.
Rotor iron core 5 is fixed on the inner peripheral surface of rotor 2 by magnet 4, and stator iron core 6 is relative with this rotor iron core 5, is free unoccupied place to be fixed on the axle 1.In stator iron core 6, produce rotating magnetic field owing to the cable that is applied in hollow portion 7 supplying electric currents of an end that is arranged on axle 1.
That is to say, constitute induction synchro motor (occasion that adopts induction motor is also arranged as motor), and make cylinder 2 with respect to axle 1 rotation by these magnet 4, rotor iron core 5 and stator iron core 6.Therefore the outer circumferential face of the cylinder 2 by will rotation is pressed on and has just formed such winding line structure on the Bobbin.
If therefore adopt this structure, the speed of rotor 2 is proportional with winding speed substantially.
Recently require to improve the winding speed of line in order to boost productivity, the essential for this reason peripheral velocity that improves cylinder 2.For example need make the peripheral velocity of cylinder 2 reach about 6000(m/min), this is adopted following two kinds of methods usually:
(1) external diameter of cylinder 2 is increased,
(2) the rotation revolution of cylinder 2 is improved.
In said method (1), not only there is the big problem of own chap that makes cylinder 2, also will considers to increase the problem of rear bearing 3 required precisions corresponding to the weight of cylinder 2.
Therefore always be employing method (2) in the past, and the diameter of axle 1 is diminished, thereby the maximum load of axle is diminished, and, the little bearing 3 of external diameter in can adopting.
But the diameter of axle 1 is more little, and the frequency of the natural vibration that takes place in axle 1 is just low more; Along with the raising of the rotation revolution of cylinder 2 then natural vibration below satisfying the revolution of above-mentioned peripheral velocity, take place.
Describe with regard to natural vibration at this.In general, so-called natural vibration represents to construct the intrinsic mechanical property that is had, and during with this structure of natural frequency exciting resonance phenomenon will take place, and this structure is just with very large amplitude vibration.
Fig. 8 shows natural vibration and the vibrational mode thereof in axle 1.Because cylinder 2 coaxial 1 is compared and is had very large rigidity, so that the natural frequency of cylinder 2 coaxial 1 is compared is very high.So if on the whole can omit the natural vibration of cylinder 2 to motor as one, and the only natural vibration of consideration axle 1.
As shown in the figure, when cylinder 2 stops the rotation, in axle 1, surely not vibrate.Therefore, when cylinder 2 begins to rotate, owing to follow the vibration of its rotation will make axle 1 exciting, (in this example) when the revolution of cylinder 2 reaches 7980 rev/mins, the natural vibration that to take place with its two ends immovable point on axle 1 be " node " (in this example, frequency is 133Hz, and vibration is a vibrational mode).In this case, cylinder 2 carries out the vibration of above-below direction integrally along with the vibration of axle 1.
Then the rotation revolution of cylinder 2 increases, when its rotation revolution reaches 16080 rev/mins, taking place with its two ends immovable point and its point of bisection (being mid point) on axle 1 is the natural vibration (in this example, frequency is 268Hz, vibrates to be the secondary vibration pattern) of each " node ".In this case, owing to, vibrate so cylinder 2 resembles seesaw ground along with the two ends of the vibrator 2 of axle 1 vibrate with opposite phases.
In like manner along with the increase of the revolution of cylinder 2, the natural vibration (n vibrational mode) that successively to take place with its two-end-point and its n equal diversion point on axle 1 be each " node ".Here n is the integer greater than 1, along with the increase of n can have the optical axis 1 natural vibration of other parts in addition.
After on the axle 1 such natural vibration having taken place, along with this vibrator 2 produces vibration, with in the machinery, this vibration also is delivered on the winch spool at fiber, has the problem of the quality reduction that makes line like this.In addition, because natural vibration rotor iron core 5 and stator iron core 6(are referring to Fig. 7) can contact, existence also may cause the problem of motor damage itself like this.
The solid of rotation equipment for inhibiting of vibration that provides a kind of amplitude that makes the natural vibration of accompanying rotation to reduce significantly is provided at the problems referred to above.
In order to address the above problem, this solid of rotation equipment for inhibiting of vibration is characterised in that it comprises first, second group electromagnet and first, second detection device; Said first, second group electromagnet is the surface of revolution on the solid of rotation that rotates freely with respect to the fixed support axle, and they attract above-mentioned solid of rotation mutually respectively on the contrary to each axle direction on two axle direction different by the rotating center of above-mentioned solid of rotation; Said first, second detection device is along detecting respectively with respect to the displacement amount of said fixing back shaft with the reference value of above-mentioned solid of rotation on above-mentioned two different axle direction; By above-mentioned first, second detection device, carry out following addition and additive operation respectively for above-mentioned first, second group electromagnet, promptly based on corresponding to above-mentioned axial displacement amount, add corresponding to one among the attraction force of this axial that group electromagnet, deduct another attraction force in the same group of electromagnet simultaneously.
According to the present invention, can utilize first, second detection device to detect by the displacement amount on different two axle direction of surface of revolution rotating center respectively with respect to the reference value of fixed support axle and solid of rotation.
When utilizing the detected displacement amount of first detection device to increase, in first group of electromagnet one offsetting the attraction force that increases on the direction that this displacement amount increases to solid of rotation, in while same group of electromagnet another reduces the attraction force to solid of rotation, think that the increase displacement amount that makes solid of rotation and fixed support between centers reduces, the two is attracted each other and make them.Second detection device and second group of electromagnet also are same.Displacement amount between fixed support axle and solid of rotation is remained on the constant reference value.
In addition, if be respectively reference value by the detected displacement amount of first, second detection device, then the attraction force of each electromagnet generation of first, second group is respectively certain value, and supporting axis and solid of rotation remain under the state of equilibrium.
Fig. 1 is the sectional view of the important composition parts of expression first embodiment of the invention;
Fig. 2 is the sectional view along A-A ' line among Fig. 1;
Fig. 3 is the skeleton diagram of the electric formation of expression present embodiment;
Fig. 4 for the revolution of cylinder 2 of expression present embodiment with the performance plot that concerns between amplitude;
Fig. 5 is the skeleton diagram of the electric formation of expression second embodiment of the invention;
Fig. 6 is the skeleton diagram of the electric formation of expression third embodiment of the invention;
Fig. 7 is used in the sectional view that has the high-speed motor structure in the fiber machinery for expression;
Fig. 8 is the natural vibration of expression axle 1 and the explanatory drawing of its vibrational mode.
Embodiments of the invention are described with reference to the accompanying drawings.
Fig. 1 is the side sectional view of an embodiment's of expression concise and to the point formation.This figure is attached to the equipment for inhibiting of vibration 10 of present embodiment among Fig. 7, and this equipment for inhibiting of vibration 10 is made of yoke 11, secondary yoke 12, coil 13, detector 14 and a drive circuit 15.Because Fig. 1 represents with prosign with the same parts among Fig. 7, so it illustrates omission.
The following describes this embodiment's detailed structure, Fig. 2 is the sectional view along A-A ' line among Fig. 1.
As shown in Figure 2, the magnetic pole 11 with radial configuration has been installed on axle 1 1-11 8A yoke 11, on these each magnetic poles, twining coil 13 respectively 1-13 8
In these coils, coil 13 1With 13 2On electric is the serial or parallel connection wiring, same coil 13 3With 13 4, 13 5With 13 6, 13 7With 13 8On electric, be the serial or parallel connection wiring respectively.
Secondary yoke 12 is facing to magnetic pole 11 1-11 8Be installed on the inner peripheral surface of cylinder 2.If cylinder 2 is not a magnetic, this secondary yoke 12 also can be omitted.Under the debatable situation of eddy current loss,, can reduce this eddy current loss in addition by making 12 one-tenth laminated construction of a yoke 11 and secondary yoke.
By making coil 13 1-13 8In flow through electric current, at magnetic pole 11 1-11 8With the magnetic line of force shown in the generation figure in the secondary yoke 12, promptly produced attraction force to secondary yoke 12.
Yoke 11 of detector 14x contrast detects the x axle direction top offset amount shown in publishing picture and the direction of displacement with the reference value of the space dx of 12 of secondary yokes.For example in this space under the situation of the direction displacement that diminishes, detector 14x exports its displacement amount with symbol (-), and exports its displacement amount with symbol (+) in the space when the direction displacement that increases.Yoke 11 of same detector 14y contrast detects the y axle direction top offset amount shown in publishing picture and the direction of displacement with the reference value of the space dy of 12 of secondary yokes.
Electric formation, particularly detector 14x, 14y, drive circuit 15 and the coil 13 of present embodiment are described below with reference to Fig. 3 1-13 8Parts identical with Fig. 2 among Fig. 3 are represented with same label.
As shown in Figure 3, supply with controller 153 after the amplification that the testing result of detector 14x process detecting amplifier 151 is scheduled to.Controller 153 is for the detection of detector 14x, and the result carries out for example PID(ratio, integration, differential) etc. suitable calculation process, controller 153 is supplied with adder 155 with this operation result then 1An input end (+) and adder 155 2An input end (-), adder 155 1, 155 2Another input end be supplied to certain current-order C.
In adder 155 1In, this certain current-order C is with the result of calculation addition that is obtained by controller 153, by power amplifier 157 1Electric current amplify after this addition result be sent to coil 13 3With 13 4In.
And in adder 155 2In, the current-order C that this is certain subtracts each other with the result of calculation that is obtained by controller 153, by power amplifier 157 2Electric current this subtracts each other the result and is sent to coil 13 after amplifying 7, 13 8In.Power amplifier 157 in addition 1, 157 2Current Amplification Factor to be set at be mutually the same.
In like manner the testing result of detector 14y is also carried out the processing same with detector 14x.That is, after the testing result of detector 14y is successively passed through the PID computing of the amplification of detecting amplifier 152 and controller 154, in adder 156 1In with certain current-order C addition, by power amplifier 158 1Electric current amplify after this addition result be sent to coil 13 1, 13 2In; Simultaneously at adder 15b 2In, the current-order C that this is certain subtracts each other with the result of calculation of controller 154, by power amplifier 158 2Electric current this subtracts each other the result and is sent to coil 13 after amplifying 5, 13 6In.
The following describes this embodiment's operation.
Under the minimum situation of the vibration of situation that the rotation of cylinder 2 stops or accompanying rotation, because space dx, the dy of yoke 11 and secondary yoke 12 are respectively reference value, so the testing result of detector 14x, 14y is zero simultaneously, therefore, the operation result of controller 153,154 also is zero.Adder 155 like this 1, 156 1Addition result and adder 155 2, 156 2The result that subtracts each other all be certain current-order C respectively, thereby supply coil 13 1, 13 2With 13 3, 13 4With 13 5, 13 6With 13 7, 13 8Current value all be respectively the same.Consequently make by coil 13 1, 13 2With 13 5, 13 6Each attraction force to secondary yoke 12 that produces is cancelled each other, with reason coil 13 3, 13 4With 13 7, 13 8Each attraction force to secondary yoke 12 that produces is also cancelled each other.That is to say because by each coil produce to the attraction force of secondary yoke 12 all being balance, so space dx, dy remain reference value along Fig. 2 x direction and y direction.
Describe at the situation of vibrating, also take place the direction displacement that increases to space dx owing to cylinder 2 rotations make axle 1 below.
In this case, because detector 14x is with the displacement amount of symbol (+) output with respect to reference value, so the operation result of controller 153 also provides in view of the above.Thereby in adder 155 1Middle output this operation result with certain current-order C added signal, so by coil 13 3, 13 4The attraction force that produces increases; Simultaneously in adder 155 2In certain current-order C is deducted the operation result of controller 153, so by coil 13 7, 13 8The attraction force that produces reduces.
Because the rigidity of cylinder 2 is bigger than the rigidity of axle 1, so yoke 11 is relatively pulled to (+) direction (to the right) of x axle, consequently on axle 1, offset the attraction force of displacement, that is to say space dx is worked to the attraction force of the direction that diminishes.
On the contrary, make axle 1 vibration in rotation, and take place under the situation of the direction displacement that space dx diminishes by cylinder 2, because export displacement amount with respect to reference value with symbol (), so, in adder 155 1Middle the signal output of the operation result that certain current-order C is deducted controller 153, like this by coil 13 3, 13 4The attraction force that produces reduces; Simultaneously in adder 155 2In, because the operation result addition of certain current-order C with controller 153, so, by coil 13 7, 13 8The attraction force that produces increases.
Therefore, a yoke 11 is relatively pulled to (-) direction (left) of X-axis, offsets the attraction force of displacement like this on axle 1, that is to say space dx is worked to the attraction force that becomes general orientation.
That is to say on the x axle direction, by detector 14x → drive circuit 15 → coil 13 3, 13 4With 13 7, 13 8Attraction → detector 14x(displacement detecting) such feedback loop control space dx often remains on the reference value.
Same action is also carried out on the y axle direction.That is to say, by detector 14y → drive circuit 15 → coil 13 1, 13 2With 13 5, 13 6Attraction → detector 14y(displacement detecting) such feedback loop control space dy often remains on the reference value.
Therefore, by controlling the displacement on x axle and the y axle direction respectively independently, and make space dx, the dy of 12 of yoke 11 and secondary yokes often remain on the reference value, controlled the whole zone of the surface of revolution among Fig. 2 like this, even therefore by the rotation excitation of cylinder 2 natural vibration has taken place on axle 1, and the amplitude of this natural vibration reaches peak value, also can be with this amplitude suppressing for very little.
Fig. 4 is the rotation revolution of expression cylinder 2 and the performance plot of the relation between the vibration amplitude of a point (end of the outer circumferential face of Fig. 8 intermediate roll 2).As shown in the figure, in existing example, along with natural vibration successively takes place for the raising of the rotation revolution of cylinder 2, therefore peak value successively appears at the amplitude on a of the outer circumferential face one end point rotating when revolution is 7980 rev/mins, 16080 rev/mins.
On the other hand, the same with existing example in the motor that has added present embodiment, along with natural vibration successively takes place in the raising of the rotation number of cylinder 2, even but can determine and welcome this amplitude of peak value and also can be suppressed to very little.
Therefore basis has been added the motor of present embodiment, owing to can in the gamut that almost reaches maximum number of revolutions, realize low vibrationization, thus there is no need under the revolution zone of avoiding the natural vibration generation, to move, thereby can move under the revolution arbitrarily.
In this embodiment, though do not specify the position of yoke 11 and secondary yoke 12, but equipment for inhibiting of vibration of the present invention is arranged on " antinode " part that should suppress vibrational mode, and the natural vibration that suppresses axle 1 like this is resultful.
In addition, because present embodiment relates to the structure that is contained in motor interior, so the outside needs the space hardly.
In addition in the present embodiment, identical certain current-order C respectively with according to the operation result addition of each axle direction top offset amount or subtract each other, but for transmit rotating force situation about being pressed at the cylinder 2 on Fig. 2 x axle direction on the external means under, as shown in Figure 5, to being coil 13 with the relative coil homogeneous groups of x axle direction 3, 13 4With 13 7, 13 8, can be earlier the current-order C ' of the compaction pressure of expression cylinder 2 respectively with certain current-order C addition, then addition result with the operation result addition of the displacement amount of detector 14x or subtract each other.Like this, because compaction pressure is setovered in advance,, the spring number when compressing is changed arbitrarily so when the outer circumferential face of cylinder 2 is pressed on the drum, also can alleviate the load on the bearing 3.
In addition in the above-described embodiments, for detect the x axle direction, a detector has been adopted in the axial displacement of y respectively, but as shown in Figure 6, can relative initial point with the symmetrical position of detector 14x, 14y on each other to detector 14 ' x, 14 ' y are set over the ground, obtain these by differential amplifier 159,160 and after the difference of the testing result of right detector, be conducted to again in the detecting amplifier 151,152.Adopt such structure, not only make the sensitivity that detects displacement amount improve two times; But also can offset by the intrinsic noise of detector or temperature variation and the characteristic variations that causes, so improved measuring accuracy.
According to aforesaid the present invention, when increasing by the detected displacement amount of first or second detection device, in first group or the second group of electromagnet one increases the attraction force to solid of rotation for the increase of offsetting this displacement amount, in while same group of electromagnet another reduces the attraction force to solid of rotation, think the increase that makes this displacement amount and reduce to get off that solid of rotation and fixed support axle are attracted each other.
Therefore, even the natural vibration of accompanying rotation takes place, because for displacement amount between fixed support axle and solid of rotation being remained on usually carry out the increase of attraction force on the reference value or reducing, can reduce this natural vibration significantly like this.

Claims (1)

1, a kind of equipment for inhibiting of vibration of solid of rotation is characterized in that, it comprises first group, second group electromagnet and first, second detection device;
Said first group, second group electromagnet is the surface of revolution on the solid of rotation that rotates freely with respect to the fixed support axle, and they attract above-mentioned solid of rotation mutually respectively on the contrary to each axle direction on two axle direction different by the rotating center of above-mentioned solid of rotation;
Said first, second detection device is along the displacement amount that detects respectively on above-mentioned different two axle direction with respect to the reference value of said fixing back shaft and above-mentioned solid of rotation;
By above-mentioned first, second detection device, carry out following addition and additive operation respectively for above-mentioned first group, second group electromagnet, promptly based on corresponding to above-mentioned axial displacement amount, add corresponding to one among the attraction force of this axial that group electromagnet, deduct another attraction force in the same group of electromagnet simultaneously.
CN94103256A 1993-02-24 1994-02-24 The equipment for inhibiting of vibration of solid of rotation Pending CN1095804A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP03586193A JP3259404B2 (en) 1993-02-24 1993-02-24 Vibration suppressor
JP35861/93 1993-02-24

Publications (1)

Publication Number Publication Date
CN1095804A true CN1095804A (en) 1994-11-30

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Application Number Title Priority Date Filing Date
CN94103256A Pending CN1095804A (en) 1993-02-24 1994-02-24 The equipment for inhibiting of vibration of solid of rotation

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JP (1) JP3259404B2 (en)
KR (1) KR100323327B1 (en)
CN (1) CN1095804A (en)

Cited By (6)

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Publication number Priority date Publication date Assignee Title
CN1942633B (en) * 2004-04-07 2010-06-16 神钢建设机械株式会社 Rotation-type working machine
CN102216634A (en) * 2008-11-21 2011-10-12 谢夫勒科技有限两合公司 Rolling bearing having integrated reluctance stepper motor
CN102537167A (en) * 2011-12-31 2012-07-04 北京交通大学 Magnetic liquid vibration-reduction device
CN108002112A (en) * 2016-11-01 2018-05-08 日本Tmt机械株式会社 Balance modification method and rotary part
CN108223970A (en) * 2018-01-25 2018-06-29 福建省南安市天威消防设备有限公司 A kind of anti-collision type ground fire hydrant
CN113086755A (en) * 2021-04-13 2021-07-09 哈尔滨理工大学 Cable manufacture draw gear

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KR20030000414A (en) * 2001-06-25 2003-01-06 현대자동차주식회사 A mounting bush of a vehicle
KR100456769B1 (en) * 2001-12-19 2004-11-10 현대자동차주식회사 Active vibration control device for vehicles
KR100613486B1 (en) 2005-03-04 2006-08-21 주식회사 대우일렉트로닉스 Damping device of sr motor
CN109854622B (en) * 2019-03-26 2020-04-28 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） Active magnetic bearing system capable of controlling axial system radial vibration based on intelligent material

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Publication number Priority date Publication date Assignee Title
CN1942633B (en) * 2004-04-07 2010-06-16 神钢建设机械株式会社 Rotation-type working machine
CN102216634A (en) * 2008-11-21 2011-10-12 谢夫勒科技有限两合公司 Rolling bearing having integrated reluctance stepper motor
CN102537167A (en) * 2011-12-31 2012-07-04 北京交通大学 Magnetic liquid vibration-reduction device
CN108002112A (en) * 2016-11-01 2018-05-08 日本Tmt机械株式会社 Balance modification method and rotary part
CN108002112B (en) * 2016-11-01 2021-01-05 日本Tmt机械株式会社 Balance correction method and rotating member
CN108223970A (en) * 2018-01-25 2018-06-29 福建省南安市天威消防设备有限公司 A kind of anti-collision type ground fire hydrant
CN108223970B (en) * 2018-01-25 2024-01-26 福建省南安市天威消防设备有限公司 Anti-collision type ground hydrant
CN113086755A (en) * 2021-04-13 2021-07-09 哈尔滨理工大学 Cable manufacture draw gear

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Publication number Publication date
KR100323327B1 (en) 2002-07-08
JPH06249286A (en) 1994-09-06
KR940020019A (en) 1994-09-15
JP3259404B2 (en) 2002-02-25

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