• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A shape-memory alloy actuator for compensating ball screw drive wear belongs to the field of ball screw manufacture. The shape-memory alloy actuator for compensating ball screw drive wear comprises keyways, shape-memory alloy drivers, a locking ring, a heating element, a locking ring housing, shape-memory alloy holes, a heating plate and a heating coil. The shape-memory alloy drivers are mounted in the locking ring. The heating element is mounted at the exterior of the locking ring. The present invention has the advantages: the shape-memory alloy actuator can compensate positioning precision loss caused by wear, reduce the maintenance, prolong the service life and improve the workpiece quality, additionally, it does not make major changes to the component design, so as to bring high profit to the manufacturers.
    公开号:NL2026792A
    申请号:NL2026792
    申请日:2020-10-29
    公开日:2021-08-11
    发明作者:Zhou Liang；Song Mijia；Jiang Hongkui；Tian Bocheng
    申请人:Univ Shandong Jianzhu；
    IPC主号:
    专利说明:

    -1- SHAPE-MEMORY ALLOY ACTUATOR FOR COMPENSATING BALLSCREW DRIVE WEAR
    TECHNICAL FIELD The present invention relates to a shape-memory alloy actuator for compensating ball screw drive wear. Specifically, the shape-memory alloy actuator for compensating ball screw drive wear is designed by utilizing the shape memory effect of a shape-memory alloy, and belongs to the field of ball screw manufacture.
    BACKGROUND A ball screw pair has the advantages of high efficiency and energy conservation, precise positioning, precise guiding, quick response as well as high-speed, synchronous, and reversible drive. It is an irreplaceable key component of the CNC machine tool and the mechatronic product. It also is an indispensable basic part to develop the equipment manufacturing industry, and to improve the national defense and national comprehensive economic power. Currently, people propose multiple solutions to change the ball screw drive preload. Some solutions focus on some mechanisms which can adjust the preload without detaching the ball screw, such as the expansion bolt, the differential ring or the worm drive. Besides, the researchers develop an actuator to control the preload, so as to improve the adjustment solution; or, they utilize a solution: compensating the thermal expansion caused by friction by compensating the preload displacement caused by the thermal load, so as to dynamically change the ball screw drive preload. The above solutions utilize pure mechanical adjustment systems needing to access the ball screw drive or quite- complicated and high-cost active systems. None of the existing active systems are specially designed for the active wear compensation. However, the actuator proposed by the present invention can compensate the position precision loss caused by the wear, reduce the maintenance, prolong the service life and improve the workpiece quality. The actuator does not make major changes to the component design, takes the place of a gasket generally with the specified preload, and regenerates the required preloading condition, so as to bring high profit to the manufacturers.SUMMARY
    0. In view of the above defects, the present invention proposes a shape-memory alloy actuator for compensating ball screw drive wear. The present invention is achieved by the following technical solution: a shape-memory alloy actuator for compensating ball screw drive wear comprises keyways, shape- memory alloy drivers, a locking ring, a heating element, a locking ring housing, shape- memory alloy holes, a heating plate and a heating coil. The keyways are formed in the locking ring housing. The shape-memory alloy holes are uniformly distributed in the locking ring housing. The heating coil is uniformly wound around the heating plate. The heating element is mounted on the locking ring housing. The shape-memory alloy drivers are mounted in the shape-memory alloy holes. When the actuator is working, a feather key is mounted in the keyways to keep aligning and preloading. The heating coil is powered on to generate the heat such that the temperature of the heating element increases. At this time, the environment temperature of the actuator increases, and the shape-memory alloy drivers are activated. So, the shape-memory alloy drivers expand to close the clearance between the actuator and a nut and also generate the force to resist the rigidity generated by the ball screw drive. When its maximum stroke is achieved, the heating coil is powered off, the temperature reduces, and the shape- memory alloy drivers cool down and return to its initial state.
    The present invention has the following beneficial effects: the actuator can compensate the positioning precision loss caused by wear, reduce the maintenance, prolong the service life and improve the workpiece quality. The actuator is mounted between a flange nut and a counter nut, takes the place of a gasket generally with the specified preload, and regenerates the required preloading condition. Additionally, it does not make major changes to the component design, so as to bring high profit to the manufacturers.
    BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic structural diagram of the present invention. FIG. 2 is a sectional view of the present invention.
    FIG. 3 is a sectional view of a locking ring of the present invention.
    FIG. 4 is a schematic structural diagram of a locking ring of the present invention. FIG. 5 is a schematic structural diagram of a heating element of the present invention.
    -3- In the drawings, 1-keyway, 2-shape-memory alloy driver, 3-locking ring, 4-heating element, 301-locking ring housing, 302-shape-memory alloy hole, 401-heating plate, and 402-heating coil.
    DESCRIPTION OF THE EMBODIMENTS A shape-memory alloy actuator for compensating ball screw drive wear comprises keyways 1, shape-memory alloy drivers 2, a locking ring 3, a heating element 4, a locking ring housing 301, shape-memory alloy holes 302, a heating plate 401 and a heating coil 402. The keyways 1 are formed in the locking ring housing 301. The shape-memory alloy holes 302 are uniformly distributed in the locking ring housing
    301. The heating coil 402 is uniformly wound around the heating plate 401. The heating element 4 is mounted on the locking ring housing 301. The shape-memory alloy drivers 2 are mounted in the shape-memory alloy holes 302. When the actuator is working, a feather key is mounted in the keyways 1 to keep aligning and preloading. The heating coil 402 is powered on to generate the heat such that the temperature of the heating element 4 increases. At this time, the environment temperature of the actuator increases, and the shape-memory alloy drivers 2 are activated. So, the shape-memory alloy drivers 2 expand to close the clearance between the actuator and a nut and also generate the force to resist the rigidity generated by the ball screw drive. When its maximum stroke is achieved, the heating coil 402 is powered off, the temperature reduces, and the shape-memory alloy drivers 2 cool down and return to its initial state. Those of ordinary skill in the art can make changes, modifications, replacements, and variations to the above embodiments without departing from the principle and spirit of the present invention according to the teachings of the present invention. Those changes, modifications, replacements, and variations should still fall within the protection scope of the present invention.
    权利要求:
    Claims (3)
    [1]
    A shape memory alloy actuator for compensating for wear on a ballscrew comprising shape memory alloy drives, a lock ring and a heating element, the shape memory alloy drives being mounted in the lock ring, and wherein the heating element mounted on the outside of the locking ring.
    [2]
    The shape memory alloy actuator for compensating for wear on a ballscrew according to claim 1, wherein the locking ring is formed by a locking ring housing, keyways and holes for a shape memory alloy; wherein the keyways are formed in the lock ring housing; wherein the holes for a shape memory alloy are uniformly dispersed in the lock ring housing.
    [3]
    The shape memory alloy actuator for compensating for wear on a ballscrew according to claim 1, wherein the heating element is formed by a heating coil and a heating plate; wherein the heating coil is wound uniformly around the heating plate.
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    同族专利:
    公开号 | 公开日
    CN110822049A|2020-02-21|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CN201911265302.0A|CN110822049A|2019-12-11|2019-12-11|Ball screw transmission wear compensation shape memory alloy actuating mechanism|
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