CN108488343B - High-life variable-lead screw mechanism based on electromagnetic force balance - Google Patents
High-life variable-lead screw mechanism based on electromagnetic force balance Download PDFInfo
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- CN108488343B CN108488343B CN201810243337.3A CN201810243337A CN108488343B CN 108488343 B CN108488343 B CN 108488343B CN 201810243337 A CN201810243337 A CN 201810243337A CN 108488343 B CN108488343 B CN 108488343B
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- 230000007246 mechanism Effects 0.000 title claims abstract description 26
- 230000007704 transition Effects 0.000 claims abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000033001 locomotion Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
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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
- F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
- F16H25/2247—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rollers
- F16H25/2261—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rollers arranged substantially perpendicular to the screw shaft axis
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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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B21/00—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings
- F16B21/02—Releasable fastening devices locking by rotation
- F16B21/04—Releasable fastening devices locking by rotation with bayonet catch
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
- Transmission Devices (AREA)
Abstract
The invention discloses a high-service-life variable-lead screw mechanism based on electromagnetic force balance, which comprises a screw rod, a nut, a pin roll and an electromagnet, wherein a variable-lead spiral groove is formed in the outer wall of a rod body of the screw rod, two ends of the screw rod are respectively fixed on a base of a bearing driving mechanism of a metro door, the nut is sleeved on the screw rod to form a screw pair, the pin roll and the electromagnet are both arranged in the nut, the pin roll comprises a roll and a pin roll, the roll is rotatably connected with one end of the pin roll, the other end of the pin roll is fixedly connected with the annular inner wall of the nut, the electromagnet comprises a first electromagnetic ring and a second electromagnetic ring which are concentrically arranged, the second electromagnetic ring is sleeved on the pin roll and is in transition fit with the pin roll, the first electromagnetic ring is sleeved on the outer side of the second electromagnetic ring. The invention utilizes the electromagnetic force generated by the electromagnet to balance the force of the spiral groove on the roller and the force of the nut on the pin shaft, so that the whole variable-lead screw mechanism has balanced operation and the service life of the variable-lead screw mechanism is prolonged.
Description
Technical Field
The invention belongs to the technical field of transmission devices, and particularly relates to a high-service-life variable-lead screw mechanism based on electromagnetic force balance.
Background
In the text of the design of the variable-lead screw pair facing the metro door and the related technical research, the variable-lead screw pair is adopted to replace a traditional constant-lead screw rod to serve as a transmission system of the metro door, so that the variable-speed motion of the metro door is realized, the lead screw lead is zero at the closing position of the metro door, the mechanical self-locking of the metro door can be realized, an additional locking device is not required to be designed, the structure of the metro door system is simplified, the production cost of the metro door is reduced, and the operation reliability of the metro door is improved. However, the scheme has the defects that the stress of the roller in the designed spiral pair device is unbalanced in the rolling process in the spiral groove, and the service life of the whole spiral pair structure is influenced.
The invention relates to a variable-lead screw pin roll roller in a variable-lead screw pair structure of a metro door, wherein the variable-lead screw pair structure is used for converting the screw motion of a screw into the linear motion of a nut; the variable-lead screw pair structure is characterized in that a screw rod drives a roller to axially move, and the roller drives a nut to axially move. The lower end of the roller is contacted with the spiral groove of the screw rod and rolls in the spiral groove, and the pin shaft at the upper end of the roller is matched with the nut. In the rolling process of the pin roll roller in the spiral groove, the force of the spiral groove on the roller is larger than the force of the nut on the pin roll, so that the pin roll roller is unbalanced in stress, the pin roll roller structure is easy to damage, and the service life of the whole spiral pair structure is influenced.
Disclosure of Invention
The invention aims to provide a high-service-life variable-lead screw mechanism based on electromagnetic force balance, and aims to solve the problems that the stress on a pin roll is unbalanced, the structure of the pin roll is easy to damage, and the service life of the whole screw pair structure is influenced because the force of a screw groove on the roller is larger than the force of a nut on a pin roll in the process that the roller rolls in the screw groove.
The technical solution for realizing the purpose of the invention is as follows: a high-life variable-lead screw mechanism based on electromagnetic force balance comprises a screw rod, a nut, a pin roll and an electromagnet, wherein a variable-lead spiral groove is formed in the outer wall of a rod body of the screw rod, so that the speed-increasing and uniform-speed-reducing actions of a metro door during closing and opening are realized, and the purpose of stable operation is achieved; the two ends of the screw rod are respectively fixed on a base of a bearing driving mechanism of the metro door, the nut is sleeved on the screw rod to form a screw pair, and the pin roll and the electromagnet are arranged in the nut.
The pin roll comprises a roll and a pin roll, the roll is rotatably connected with one end of the pin roll, and the other end of the pin roll is fixedly connected with the annular inner wall of the nut, so that the roll rolls along the spiral groove.
The electromagnet comprises a first electromagnetic ring and a second electromagnetic ring which are arranged concentrically, the radius of the first electromagnetic ring is larger than that of the second electromagnetic ring, the second electromagnetic ring is sleeved on the pin shaft and is in transition fit with the pin shaft, the first electromagnetic ring is sleeved on the outer side of the second electromagnetic ring, a certain gap distance is reserved between the first electromagnetic ring and the second electromagnetic ring, and the nut is fixedly connected with the metro door through a screw pair device.
Compared with the prior art, the invention has the remarkable advantages that: the electromagnet is arranged, and the electromagnetic force generated by the electromagnet is used for balancing the force of the spiral groove on the pin roll and the force of the nut on the pin roll, so that the whole variable-lead screw mechanism is balanced in operation, and the service life of the variable-lead screw mechanism is prolonged.
Drawings
Fig. 1 is a schematic structural diagram of a high-life variable-lead screw mechanism based on electromagnetic force balance according to the present invention.
Fig. 2 is a sectional view of the long-life variable lead screw mechanism based on electromagnetic force balance of the present invention.
Fig. 3 is a plan view of the high life variable lead screw mechanism based on electromagnetic force balance of the present invention.
Fig. 4 is a schematic diagram of the electromagnet structure of the high-life variable-lead screw mechanism based on electromagnetic force balance.
Fig. 5 is a structural force analysis diagram of the long-life variable-lead screw mechanism based on electromagnetic force balance according to the present invention, wherein (a) is a force analysis diagram during door closing and (b) is a force analysis diagram during door opening.
Fig. 6 is a P L C control wiring diagram of the high-life variable-lead screw mechanism based on electromagnetic force balance according to the invention.
Figure 7 is a schematic of the roller to screw contact force of the present invention.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures.
Referring to fig. 1, 2 and 3, the electromagnetic force balance-based long-life variable-lead screw mechanism comprises a screw rod 1, a nut 2, a pin roller 3 and an electromagnet 4, wherein a variable-lead spiral groove 5 (disclosed in 'variable-lead screw pair design and related technical research facing the metro door') is formed in the outer wall of the rod body of the screw rod 1, so that the motions of speed increasing, constant speed and speed reducing during closing and opening of the metro door are realized, and the purpose of stable operation is achieved. The two ends of the screw rod 1 are respectively fixed on a base of a bearing driving mechanism of the metro door, the nut 2 is sleeved on the screw rod 1 to form a screw pair, the pin roll 3 and the electromagnet 4 are both arranged in the nut 2, the pin roll 3 comprises a roll and a pin roll, the roll is rotatably connected with one end of the pin roll, the other end of the pin roll is fixedly connected with the annular inner wall of the nut 2, so that the roll rolls along the spiral groove 5, the electromagnet 4 comprises a first electromagnetic ring 4-1 and a second electromagnetic ring 4-2 which are concentrically arranged, the radius of the first electromagnetic ring 4-1 is larger than that of the second electromagnetic ring 4-2, the second electromagnetic ring 4-2 is sleeved on the pin shaft, in transition fit with the pin shaft, the first electromagnetic ring 4-1 is sleeved outside the second electromagnetic ring 4-2, and a certain clearance distance is reserved between the nut 2 and the subway door, and the nut is fixedly connected with the subway door through a screw pair device.
The invention utilizes the electromagnetic force generated by the electromagnet 4 to balance the force of the pin roll roller 3 on the spiral groove 5 and the force of the pin roll on the nut 2, namely Fk＝FnF, so that the operation of the whole variable lead screw mechanism is balanced, and the service life of the variable lead screw mechanism is prolonged.
In conjunction with FIG. 7, wherein FQIs the total force to which the roller is subjected, FnFor normal forces, the relationship between the two is:
Fn＝FQcosα (1)
α is the pressure angle of the helical groove 5 with the roller.
The stress of a metro door is taken as a research object, according to EN14752-2005 railway facilities and the system standard of a carriage side door, the force used at the beginning of opening the door through manual operation can be found to be 150N, the force used in the running process is 75N, and the stress of the roller is calculated on the basis of the force, because the force borne by the roller is directed to the axial center of the roller, the stress of the roller in the structure is calculated according to a formula (1), α with a constant lead section is taken for calculation, and the rotating speed N of a lead screw 1 is taken as
The radius r of the lead screw is 10mm, and the lead L is 40 mm.
The angular velocity ω is:
the pressure angle is:
obtained by calculation, F in the process of operationn64N, function of opening doorForce Fk＝Fn＝127N。
The electromagnetic force F is as follows:
F＝μ0×(IW)2×A/L0(4)
current I, number of turns W of coil, and vacuum permeability μ0Cross-sectional area of coil A, spacing between coils L0。
Take a metro door as an example:
with reference to fig. 4, 5 and 6, the metro door closing process: the roller of the pin roll 3 is positioned in the nut 2, and in the self-locking groove, when the servo motor rotates positively to drive the screw rod 1 to rotate, the subway door is driven to move rightwards by the nut 2 on the left side, and the pin roll 3 is contacted with the right side wall of the spiral groove 5 and is subjected to a leftward total force F1The ab coil of the first electromagnetic ring 4-1 and the ef coil of the second electromagnetic ring 4-2 are respectively communicated with certain currents in opposite directions to generate equidirectional magnetic fields to repel each other, the cd coil of the first electromagnetic ring 4-1 and the gh coil of the second electromagnetic ring 4-2 are respectively communicated with certain currents in the same direction to generate anisotropic magnetic fields to attract, and the pin shaft is subjected to a force F towards the right of the second electromagnetic ring 4-20And forms a total force F with the force of the pin shaft which is applied by the nut 2 to the right2The balance pin roller 3 drives the nut 2 to move rightwards, the nut 2 drives the train door to move rightwards, when the train door is closed, the electromagnet 4 is powered off, the lead of the lead screw 1 becomes an initial section, and meanwhile, the train door reaches a self-locking state.
The subway door opening process: the roller of the pin roll 3 is positioned in the nut 2, and in the self-locking groove, when the servo motor rotates reversely to drive the screw rod 1 to rotate, the nut 2 on the right side drives the metro door to move leftwards, and the pin roll 3 is contacted with the left side wall of the spiral groove 5 and is subjected to rightward total force F3The ab coil of the first electromagnetic ring 4-1 and the ef coil of the second electromagnetic ring 4-2 are respectively connected with a certain equidirectional current to generate a different-direction magnetic field for attraction, the cd coil of the first electromagnetic ring 4-1 and the gh coil of the second electromagnetic ring 4-2 are respectively connected with a certain opposite-direction current to generate a equidirectional magnetic field for repulsion, and the pin shaft is subjected to a leftward force F of the second electromagnetic ring 4-20And forms a total force F with the left force of the pin shaft received by the nut 24The balance pin roller 3 drives the nut 2 to move leftwards, and the nut 2 drives the train door to move leftwardsAnd (4) moving left, when the train door reaches the tail end, the electromagnet 4 is powered off, the lead of the screw rod 1 is changed into an initial section, and meanwhile, the train door reaches a self-locking state.
1. The electromagnet 4 requires:
(1) the magnetism of the electromagnet 4 can be controlled by using the on-off current;
(2) the strength of the magnetism of the electromagnet 4 can be controlled by the current;
(3) the magnetic pole direction of the electromagnet 4 can be controlled by the current direction;
(4) the electromagnet 4 is supplied by variable current, and the current of the electromagnet is led to a sensor and is in a correlation relation with the positive and negative rotation of the servo motor;
(5) the electromagnet 4 is of a double-layer annular structure, and the wound coils are wound from the middle to two sides according to a certain density degree from density to density rule;
(6) the first electromagnet ring 4-1 has a certain strength and rigidity, while the second electromagnet ring 4-2 has a certain flexibility, but will not be damaged due to lack of rigidity.
In conclusion, because the electromagnet 4 is arranged in the invention, the force of the spiral groove 5 applied to the roller and the force of the nut 2 applied to the pin shaft, namely F, are balanced by the electromagnetic force generated by the electromagnet 4k＝FnAnd F, the operation of the whole variable-lead screw mechanism is balanced, and the service life of the variable-lead screw mechanism is prolonged.
Claims (1)
1. The utility model provides a high life becomes helical pitch screw mechanism based on electromagnetic force is balanced which characterized in that: the variable-lead spiral groove type subway door comprises a screw rod (1), a nut (2), a pin roll roller (3) and an electromagnet (4), wherein a variable-lead spiral groove (5) is formed in the outer wall of a rod body of the screw rod (1), so that the actions of speed increasing, constant speed and speed reducing during closing and opening of the subway door are realized, and the purpose of stable operation is achieved; two ends of the screw rod (1) are respectively fixed on a base of a bearing driving mechanism of the metro door, the nut (2) is sleeved on the screw rod (1) to form a screw pair, and the pin roll roller (3) and the electromagnet (4) are arranged in the nut (2);
the pin roll roller (3) comprises a roller and a pin roll, the roller is rotationally connected with one end of the pin roll, and the other end of the pin roll is fixedly connected with the annular inner wall of the nut (2), so that the roller rolls along the spiral groove (5);
the electromagnet (4) comprises a first electromagnetic ring (4-1) and a second electromagnetic ring (4-2) which are concentrically arranged, the radius of the first electromagnetic ring (4-1) is larger than that of the second electromagnetic ring (4-2), the second electromagnetic ring (4-2) is sleeved on a pin shaft and is in transition fit with the pin shaft, the first electromagnetic ring (4-1) is sleeved on the outer side of the second electromagnetic ring (4-2) and has a certain gap distance, and the nut (2) is fixedly connected with the metro door through a spiral pair device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810243337.3A CN108488343B (en) | 2018-03-23 | 2018-03-23 | High-life variable-lead screw mechanism based on electromagnetic force balance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810243337.3A CN108488343B (en) | 2018-03-23 | 2018-03-23 | High-life variable-lead screw mechanism based on electromagnetic force balance |
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| CN108488343A CN108488343A (en) | 2018-09-04 |
| CN108488343B true CN108488343B (en) | 2020-07-31 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110388430B (en) * | 2019-07-31 | 2021-07-09 | 东南大学 | Ball screw with self-locking structure |
| CN111520784B (en) * | 2020-05-12 | 2022-07-26 | 宁波方太厨具有限公司 | Range hood and position determining method and control method of lifting component of range hood |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4454931A (en) * | 1981-09-30 | 1984-06-19 | Otis Elevator Company | Elevator door operator having a variable pitch lead screw |
| CN1945055A (en) * | 2006-10-19 | 2007-04-11 | 南京康尼机电新技术有限公司 | Self adaptive variable lead spiral driving mechanism |
| CN205744913U (en) * | 2016-07-08 | 2016-11-30 | 佛山格尼斯磁悬浮技术有限公司 | A kind of magnetic suspension bearing and turbine |
| CN205956219U (en) * | 2016-06-30 | 2017-02-15 | 天津飞旋科技研发有限公司 | Permanent magnet rotor's radial magnetic bearing of mixture |
-
2018
- 2018-03-23 CN CN201810243337.3A patent/CN108488343B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4454931A (en) * | 1981-09-30 | 1984-06-19 | Otis Elevator Company | Elevator door operator having a variable pitch lead screw |
| CN1945055A (en) * | 2006-10-19 | 2007-04-11 | 南京康尼机电新技术有限公司 | Self adaptive variable lead spiral driving mechanism |
| CN205956219U (en) * | 2016-06-30 | 2017-02-15 | 天津飞旋科技研发有限公司 | Permanent magnet rotor's radial magnetic bearing of mixture |
| CN205744913U (en) * | 2016-07-08 | 2016-11-30 | 佛山格尼斯磁悬浮技术有限公司 | A kind of magnetic suspension bearing and turbine |
Non-Patent Citations (1)
| Title |
|---|
| 面向地铁门的变导程螺旋副设计与相关技术研究;张本涛;《工程科技Ⅱ辑》;20170715;第9-14页，附图2.3，附图2.6 * |
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