CN112178103A - Eddy current damper with two-way threaded screw rod for increasing speed - Google Patents
Eddy current damper with two-way threaded screw rod for increasing speed Download PDFInfo
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- CN112178103A CN112178103A CN202011190125.7A CN202011190125A CN112178103A CN 112178103 A CN112178103 A CN 112178103A CN 202011190125 A CN202011190125 A CN 202011190125A CN 112178103 A CN112178103 A CN 112178103A
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- threaded screw
- inner cylinder
- right end
- eddy current
- cylinder
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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
- F16F6/00—Magnetic springs; Fluid magnetic springs, i.e. magnetic spring combined with a fluid
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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
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention discloses a bidirectional screw thread screw rod speedup eddy current damper. The invention has the technical key points that a lower connecting piece is fixedly connected at the right end of the outer cylinder, an upper connecting piece is fixedly connected at the left end of the inner cylinder, and a plurality of parallel axial sliding blocks are uniformly and fixedly connected on the outer wall of the right end of the inner cylinder and are in sliding connection with the outer cylinder through sliding block positioning grooves; the left section and the right section of the bidirectional threaded screw are respectively provided with an orthodontic threaded section and a counter-threaded section, the left section of the bidirectional threaded screw is meshed in the left end of the inner cylinder, the right section of the bidirectional threaded screw is meshed with a ball screw nut, and the ball screw nut is connected with the inner cylinder through a thrust bearing; a conductor disc is fixedly connected to the right end face of the inner cylinder and can move horizontally along with the inner cylinder; a magnet disc is fixedly connected to the right end face of the ball screw nut and can rotate along with the ball screw nut; the left end face of the magnetic disk opposite to the conductor disk is evenly distributed with a plurality of permanent magnets. The invention increases the rotating speed of the magnet disc by setting the lead ratio of the positive and negative thread sections of the bidirectional thread screw rod, and realizes the purpose of multiplying the eddy current damping force.
Description
Technical Field
The invention belongs to the technical field of energy consumption and vibration reduction of engineering structures, and particularly relates to a bidirectional thread screw rod speed-increasing eddy current damper.
Background
The eddy current damper generates relative motion between the magnetic field source and the conductor plate, namely the conductor plate performs cutting magnetic induction line motion, generates eddy current damping and consumes energy. The main magnetic field source and the conductor material are not in direct contact, so that the dynamic response and the material property of the system are not influenced, and the working performance of the damping system is not influenced. The electromagnetic damping device has the advantages of contact, small friction, good durability, convenient installation and maintenance, easy adjustment and good stability, and is a damping device with green technology and wide application prospect. The electromagnetic force of the eddy current damper is in direct proportion to the relative movement speed, and the amplification effect of improving the relative speed is the design key of the damper. A rotary eddy current damper that converts linear motion to rotational motion may provide a certain amplification factor. The invention is based on a bidirectional threaded screw rod with positive and negative thread sections, utilizes the connection relationship between components to convert the externally input horizontal displacement into the rotary motion of an internal mechanism of a damper, thereby amplifying the rotary displacement of the damper and generating eddy current damping, and simultaneously improves the rotating speed of a magnet disc by setting the lead ratio of the positive and negative thread sections of the bidirectional threaded screw rod, thereby realizing the function of greatly increasing the damping force.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a bidirectional thread screw rod speedup eddy current damper. The invention utilizes the connection relation among the components to convert the externally input horizontal displacement into the rotary motion of the internal mechanism of the damper, thereby amplifying the rotary displacement of the damper and achieving the aim of increasing the damping efficiency. Meanwhile, the lead ratio of the positive and negative thread sections of the bidirectional thread screw rod is set to increase the rotating speed of the magnet disc, so that the aim of multiplying the eddy current damping force is fulfilled.
The above object of the present invention is achieved by the following technical solutions: the eddy current damper with the bidirectional threaded screw rod for increasing speed comprises an outer cylinder and an inner cylinder; the right end of the outer cylinder is closed, a lower connecting piece is fixedly connected to the center of the right end face of the outer cylinder, the inner cylinder is a component with a hollow long handle at the left end and a hollow cylinder at the right end, the long handle at the left end of the inner cylinder extends out of a central hole at the left end of the outer cylinder, an upper connecting piece is fixedly connected to the left end of the inner cylinder, and a plurality of parallel axial sliding blocks are uniformly and fixedly connected to the outer wall of the cylinder at the right end of the inner cylinder and are in sliding connection with the outer cylinder through corresponding sliding block positioning; the device also comprises a bidirectional threaded screw rod mechanism, a conductor disc and a magnet disc; the bidirectional threaded screw mechanism comprises a bidirectional threaded screw and a ball screw nut, the left section and the right section of the bidirectional threaded screw are respectively provided with a positive thread section and a negative thread section, the diameters of the positive thread section and the negative thread section are consistent, the lead of the positive thread section is equal to or greater than the lead of the negative thread section, the left section of the bidirectional threaded screw is meshed in a hollow long handle at the left end of the inner barrel, the right section of the bidirectional threaded screw and the ball screw nut are meshed in the right end cylinder and the end part of the inner barrel, and the ball screw nut is connected with the inside of the right end cylinder of the inner barrel through a thrust; the right end face of the inner cylinder is fixedly connected with an annular conductor disc which can move horizontally along with the inner cylinder; the right end face of the ball screw nut is fixedly connected with an annular magnet disc which can rotate along with the ball screw nut; the relative position of the conductor disc and the magnet disc is fixed, and a plurality of permanent magnets are uniformly distributed on the left end face of the magnet disc opposite to the conductor disc.
Furthermore, a thread-free part is reserved at the right end of the bidirectional threaded screw rod and is connected to the center of the inner end face of the right end of the outer cylinder through a thrust bearing.
In particular, the conductor plate is made of copper or aluminum with a conductive effect.
Further, the conductor disc is made of an electrical red copper material.
Specifically, the magnet disc is made of soft iron or low-carbon steel materials.
Specifically, the permanent magnet is made of neodymium iron boron materials.
Specifically, the permanent magnets are cylindrical, the permanent magnets are uniformly arranged on the magnet disc, and the magnetic poles of the adjacent permanent magnets are opposite in direction so as to realize the shortest magnetic path.
The two ends of the eddy current damper accelerated by the bidirectional threaded screw rod are connected with an external structure which generates relative displacement, the external displacement forces the inner cylinder to do reciprocating motion on the axis, the reciprocating motion of the inner cylinder on the axis enables the bidirectional threaded screw rod to rotate and drives the ball screw nut to do reciprocating motion, and therefore the conductor disc and the magnet disc are enabled to generate relative rotation. The permanent magnet is arranged on the magnet disc, and the conductor disc cuts magnetic induction lines in the rotating process to generate an eddy current effect and realize damping synergy, so that the aim of structural vibration reduction is fulfilled.
The innovation of the invention is as follows:
(1) the left and right sections of the bidirectional threaded screw rod are respectively provided with a positive thread section and a negative thread section, and the magnet disc is suspended on the negative thread section through a ball screw nut and is not contacted with the bidirectional threaded screw rod; meanwhile, the inner cylinder and the ball screw nut are respectively in meshed transmission connection with the orthodontic thread section and the anti-orthodontic thread section; the conductor disc is fixedly connected to the inner cylinder and can move horizontally along with the sliding block; the magnet disc is fixedly connected to the ball screw nut and can move in a translation and rotation mode along with the ball screw nut; the distance between the magnet disc and the conductor disc is fixed.
(2) The diameters of the positive thread section and the negative thread section of the bidirectional thread screw rod are consistent, and the lead of the positive thread section is equal to or larger than that of the negative thread section. The magnet disc rotates relative to the conductor disc, the rotating speed of the magnet disc is controlled by the diameter of a screw rod of the bidirectional threaded screw rod, the lead of the positive thread section and the lead of the negative thread section, and the multiple of the eddy current amplification effect can be adjusted by changing the lead ratio of the positive thread section and the negative thread section.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the magnet disc rotates relative to the conductor disc, the rotating speed of the magnet disc is controlled by the diameter of a screw rod of the bidirectional threaded screw rod, the lead of the positive thread section and the lead of the negative thread section, the multiple of the eddy current amplification effect can be changed by adjusting the lead ratio of the positive thread section and the negative thread section, and specific numerical values can be determined by combining actual design requirements.
(2) The magnetic gap distance is not changed when the magnet disc and the conductor disc do reciprocating motion, and the eddy current energy consumption effect is ensured.
Drawings
Fig. 1 is a schematic half-section elevation structure diagram of an embodiment of the present invention.
Fig. 2 is a sectional view taken along line a-a in fig. 1.
In the figure: 1 is an upper connecting piece, 2 is an inner cylinder, 3 is a bidirectional threaded screw rod, 4 is an outer cylinder, 5 is a slider positioning groove, 6 is a slider, 7 is a thrust bearing I, 8 is a thrust bearing II, 9 is a ball screw nut, 10 is a conductor disc, 11 is a permanent magnet, 12 is a magnet disc, 13 is a thrust bearing III, 14 is a thrust bearing IV, and 15 is a lower connecting piece.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1 and 2, the bidirectional screw thread screw speed-increasing eddy current damper of the present embodiment includes an outer cylinder 4 and an inner cylinder 2. As can be seen from fig. 1, the right end of the outer cylinder 4 is closed and the center of the right end face is fixedly connected with a lower connecting piece 15, the inner cylinder 2 is a component with a hollow long handle at the left end and a hollow cylinder at the right end, the long handle at the left end of the inner cylinder 2 extends out of the center hole at the left end of the outer cylinder, and the upper connecting piece 1 is fixedly connected at the left end of the inner cylinder. Referring to fig. 2, the outer wall of the right cylinder of the inner cylinder 2 is uniformly and fixedly connected with 4 axial parallel sliding blocks 6, and the sliding blocks are slidably connected with the outer cylinder 4 through corresponding sliding block positioning grooves 5 in the outer cylinder 4. It also includes a bidirectional screw lead screw mechanism, a conductor disc 10 and a magnet disc 12; the bidirectional threaded screw mechanism comprises a bidirectional threaded screw 3 and a ball screw nut 9, a positive thread section and a negative thread section are respectively arranged on the left section and the right section of the bidirectional threaded screw 3, the diameters of the positive thread section and the negative thread section are consistent, and the lead of the positive thread section is equal to or greater than that of the negative thread section. The left section of the bidirectional threaded screw rod 3 is meshed in a hollow long handle at the left end of the inner cylinder 2, the right section of the bidirectional threaded screw rod 3 and a ball screw nut 9 are meshed in the inner part and the end part of a right end cylinder of the inner cylinder 2, and the ball screw nut 9 is connected with the inner part of the right end cylinder of the inner cylinder 2 through a thrust bearing I7 and a thrust bearing II 8. The right end face of the inner cylinder 2 is fixedly connected with an annular conductor disc 10 which can move horizontally along with the inner cylinder 2; an annular magnet disc 12 is fixedly connected to the right end face of the ball screw nut 9 and can rotate along with the ball screw nut 9; the relative positions of the conductor disc 10 and the magnet disc 12 are fixed, and a plurality of permanent magnets 11 are uniformly distributed on the left end face of the magnet disc 12 opposite to the conductor disc 10.
As can be seen from the figure 1, the right end of the bidirectional threaded screw rod 3 is reserved with a thread-free part and is connected to the center of the inner end face of the right end of the outer cylinder 4 through a thrust bearing III 13 and a thrust bearing IV 14.
The conductor disc 10 cuts the magnetic field lines on the magnet disc 12, and the conductor disc 10 is made of copper or aluminum with a conductive effect.
The conductor plate 10 should be made of a material with good conductive effect, and the conductor plate 10 can be made of electrical red copper and other materials.
The magnet disc 12 should be made of a good magnetic conductive material, and the magnet disc 12 should be made of soft iron or low carbon steel.
The permanent magnet 11 should be able to maintain its magnetic properties for a long time, and the permanent magnet 11 is made of neodymium iron boron or the like.
The permanent magnets 11 are cylindrical, a plurality of permanent magnets 11 are uniformly arranged on the magnet disc 12, and the magnetic pole directions of adjacent permanent magnets are opposite so as to achieve the purpose of shortest magnetic path.
The lead ratio of the thread segments of the positive thread and the thread segments of the negative thread of the two-way threaded screw according to the present invention will be further described by specific calculation.
For example: as the lead L of the orthodontic thread segment120mm, lead L of the thread section of the reverse thread2When the diameter is 10mm, the lead ratio of the positive and negative threads is as follows:
L1/L2＝2∶1；
defining the initial coordinate of the ball screw nut to be 0, when the inner cylinder horizontally moves 20mm to the right, the bidirectional threaded screw rod rotates for a circle, the ball screw nut moves 10mm to the left under the condition of neglecting the axial constraint of the sliding block and not rotating, the coordinate is-10, then the axial constraint condition of the sliding block is considered, because the horizontal displacement of the inner cylinder, the sliding block and the ball screw nut is the same, the coordinate of the ball screw nut is 20 at the moment, the whole motion process is equivalent to the horizontal movement of the ball screw nut by 30mm, namely the ball screw nut rotates for 3 weeks.
Further, the lead L of the thread section of the orthodontic tooth is set1Na mm, lead L of thread segment of the reverse thread2A mm, positive and negative threadsThe lead ratio of (A) is as follows:
L1/L2＝Na∶a
＝N∶1
defining the initial coordinate of the ball screw nut as 0, when the inner cylinder horizontally moves to the right by xmm, the bidirectional screw rod will rotate
The ball screw nut moves leftwards under the condition of neglecting the axial constraint of the slide block and not rotating
The coordinates are
Then, considering the axial constraint condition of the sliding block, because the horizontal displacement of the inner cylinder, the sliding block and the ball screw nut is the same, the coordinate of the ball screw nut is x at the moment, the whole motion process is equivalent to that the ball screw nut moves horizontally
I.e. rotation of the ball nut
And (4) week.
In order to enable the damper to exert the eddy current effect better, the design of the bidirectional threaded screw rod should select a large-lead screw rod as much as possible under the condition of meeting a sufficient amplification factor.
When the bidirectional screw thread screw rod accelerated eddy current damper works on the stay cable, the specific implementation process is as follows: the two ends of the eddy current damper are connected with the parts of the structure which are relatively deformed, the deformation of the structure forces the inner cylinder to do reciprocating motion on the axis, the reciprocating motion of the inner cylinder on the axis enables the two-way threaded screw rod to rotate and drives the sliding block and the ball screw nut to do horizontal motion, and therefore the conductor disc and the magnet disc are relatively rotated. The permanent magnet is arranged on the magnet disc, and the conductor disc cuts magnetic induction lines in the rotating process to generate an eddy current effect, so that the damping synergy is realized, and the purpose of structural vibration reduction is achieved.
The above description is only illustrative of the preferred embodiments of the present invention and should not be taken as limiting the scope of the invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure should be considered as equivalent effective embodiments, and all the changes or modifications should fall within the protection scope of the technical solution of the present invention. For example, the screw can adopt trapezoidal screw, ball screw and other similar screw transmission modes. The invention is suitable for civil engineering structures with relative displacement, such as stayed-cable, large-span bridge tower-beam joints, high-rise building interlayer displacement and the like.
Claims (7)
1. The utility model provides a two-way screw lead screw acceleration rate's eddy current damper which characterized in that: it comprises an outer cylinder and an inner cylinder; the right end of the outer cylinder is closed, a lower connecting piece is fixedly connected to the center of the right end face of the outer cylinder, the inner cylinder is a component with a hollow long handle at the left end and a hollow cylinder at the right end, the long handle at the left end of the inner cylinder extends out of a central hole at the left end of the outer cylinder, an upper connecting piece is fixedly connected to the left end of the inner cylinder, and a plurality of parallel axial sliding blocks are uniformly and fixedly connected to the outer wall of the cylinder at the right end of the inner cylinder and are in sliding connection with the outer cylinder through corresponding sliding block positioning; the device also comprises a bidirectional threaded screw rod mechanism, a conductor disc and a magnet disc; the bidirectional threaded screw mechanism comprises a bidirectional threaded screw and a ball screw nut, the left section and the right section of the bidirectional threaded screw are respectively provided with a positive thread section and a negative thread section, the diameters of the positive thread section and the negative thread section are consistent, the lead of the positive thread section is equal to or greater than the lead of the negative thread section, the left section of the bidirectional threaded screw is meshed in a hollow long handle at the left end of the inner barrel, the right section of the bidirectional threaded screw and the ball screw nut are meshed in the right end cylinder and the end part of the inner barrel, and the ball screw nut is connected with the inside of the right end cylinder of the inner barrel through a thrust; the right end face of the inner cylinder is fixedly connected with an annular conductor disc which can move horizontally along with the inner cylinder; the right end face of the ball screw nut is fixedly connected with an annular magnet disc which can rotate along with the ball screw nut; the relative position of the conductor disc and the magnet disc is fixed, and a plurality of permanent magnets are uniformly distributed on the left end face of the magnet disc opposite to the conductor disc.
2. The bi-directional threaded screw accelerated eddy current damper of claim 1, wherein: the right end of the bidirectional threaded screw rod is reserved with a thread-free part and is connected to the center of the inner end face of the right end of the outer barrel through a thrust bearing.
3. The bi-directional threaded screw accelerated eddy current damper of claim 1, wherein: the conductor disc is made of copper or aluminum with a conductive effect.
4. The bi-directional threaded screw accelerated eddy current damper of claim 3, wherein: the conductor disc is made of an electrical red copper material.
5. The bi-directional threaded screw accelerated eddy current damper of claim 1, wherein: the magnet disc is made of soft iron or low-carbon steel materials.
6. The bi-directional threaded screw accelerated eddy current damper of claim 1, wherein: the permanent magnet is made of neodymium iron boron materials.
7. The bi-directional threaded screw accelerated eddy current damper of claim 6, wherein: the permanent magnets are cylindrical, the permanent magnets are uniformly arranged on the magnet disc, and the magnetic poles of the adjacent permanent magnets are opposite in direction so as to realize the shortest magnetic path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011190125.7A CN112178103A (en) | 2020-10-30 | 2020-10-30 | Eddy current damper with two-way threaded screw rod for increasing speed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011190125.7A CN112178103A (en) | 2020-10-30 | 2020-10-30 | Eddy current damper with two-way threaded screw rod for increasing speed |
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|---|---|
| CN112178103A true CN112178103A (en) | 2021-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011190125.7A Pending CN112178103A (en) | 2020-10-30 | 2020-10-30 | Eddy current damper with two-way threaded screw rod for increasing speed |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112855821A (en) * | 2021-02-22 | 2021-05-28 | 湖南大学 | Magnetic force lead screw formula axial eddy current damper |
-
2020
- 2020-10-30 CN CN202011190125.7A patent/CN112178103A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112855821A (en) * | 2021-02-22 | 2021-05-28 | 湖南大学 | Magnetic force lead screw formula axial eddy current damper |
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