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CN-121984301-A - Linear motor module

CN121984301ACN 121984301 ACN121984301 ACN 121984301ACN-121984301-A

Abstract

The invention discloses a linear motor module, which comprises a linear motor base, a sliding table and a plurality of steel balls, wherein guide rail bars are arranged on the outer walls of two side walls of the linear motor base, protruding parts extending downwards are arranged on two sides of the sliding table, two sliding grooves which are arranged up and down are arranged on the inner walls of the protruding parts, part of the steel balls are accommodated between a first bearing surface on one guide rail bar and one sliding groove on one protruding part, part of the steel balls are accommodated between a second bearing surface on the guide rail bar and the other sliding groove on the protruding part, part of the steel balls are accommodated between a first bearing surface on the other guide rail bar and one sliding groove on the other protruding part, and part of the steel balls are accommodated between a second bearing surface on the guide rail bar and the other sliding groove on the protruding part. According to the linear motor module, the sliding table is connected with the linear motor base through the four rows of steel balls, so that the linear motor module has the advantages of strong bearing, high rigidity, stable precision, high fault tolerance and long service life.

Inventors

  • YANG JUNTAO
  • ZHANG XIANG
  • WEI GUOQIAO

Assignees

  • 广东创锋精工机械有限公司

Dates

Publication Date
20260505
Application Date
20260409

Claims (10)

  1. 1. The linear motor module comprises a linear motor base, a sliding table and a plurality of steel balls, wherein a stator is arranged on the inner bottom of the linear motor base along the length direction of the linear motor base, a rotor is arranged in the linear motor base and positioned above the stator, the sliding table is arranged on the rotor, and can slide back and forth along the length direction of the linear motor base, Guide rail bars are arranged on the outer walls of the two side walls of the linear motor base, protruding parts extending downwards are arranged on the two sides of the sliding table, two sliding grooves which are arranged up and down are arranged on the inner walls of the protruding parts, The part between the top and the outer side wall of the guide rail strip along the length direction is a first bearing surface, the first bearing surface is in an arc shape, the part between the bottom and the outer side wall of the guide rail strip along the length direction is a second bearing surface, the second bearing surface is in an arc shape, the curvatures of the first bearing surface and the second bearing surface are smaller than the curvatures of the surfaces of the steel balls, Part of the steel balls are accommodated between a first bearing surface on one guide rail strip and one sliding groove on one protruding part, part of the steel balls are accommodated between a second bearing surface on the guide rail strip and the other sliding groove on the protruding part, Part of the steel balls are accommodated between a first bearing surface on the other guide rail strip and one sliding groove on the other protruding part, and part of the steel balls are accommodated between a second bearing surface on the guide rail strip and the other sliding groove on the protruding part.
  2. 2. The linear motor module of claim 1, wherein the central angle of the first bearing surface on the rail is 90 degrees and the central angle of the second bearing surface on the rail is 90 degrees.
  3. 3. The linear motor module according to claim 1, further comprising four reflowers, wherein the convex part is provided with two through holes arranged up and down, One reflux device is arranged at one end of a bulge, the second reflux device is arranged at the other end of the bulge, one through hole on the bulge is communicated with one chute on the bulge through the reflux device, the other through hole on the bulge is communicated with the other chute on the bulge through the reflux device, The third reflux device is arranged at one end of the other protruding part, the fourth reflux device is arranged at the other end of the protruding part, one through hole on the protruding part is communicated with one chute on the protruding part through the reflux device, and the other through hole on the protruding part is communicated with the other chute on the protruding part through the reflux device.
  4. 4. The linear motor module according to claim 3, wherein the reflow device is provided with two arc-shaped through holes arranged up and down, One end of an arc through hole is communicated with one through hole on the protruding part, the other end of the arc through hole is communicated with one chute on the protruding part, One end of the other arc-shaped through hole is communicated with the other through hole on the protruding part, the other end of the arc-shaped through hole is communicated with the other chute on the protruding part, The arc through hole can connect the through hole on the protruding part with the chute, When the sliding table slides along the length direction of the linear motor base, the steel balls circularly roll in the through holes on the protruding part, the arc-shaped through holes on the reflux device and the sliding grooves on the protruding part.
  5. 5. The linear motor module according to claim 4, wherein an annular protrusion is arranged at one end of the arc-shaped through hole, a cavity enclosed by the annular protrusion is communicated with the inside of the arc-shaped through hole, and two annular protrusions on the two arc-shaped through holes are respectively inserted into two through holes on the protruding part.
  6. 6. The linear motor module according to claim 5, wherein the reflux device comprises a mounting seat and a guide piece, two arc-shaped containing grooves which are arranged up and down are arranged on the end face of the mounting seat, two arc-shaped grooves which are arched are arranged on one side of the guide piece, the two arc-shaped grooves are respectively contained in the two arc-shaped containing grooves, the arc-shaped grooves and the arc-shaped containing grooves are surrounded to form arc-shaped through holes, and the annular protrusions are arranged on the other side of the guide piece.
  7. 7. The linear motor module of claim 1, further comprising a guide rail block, wherein the inner wall of the boss is provided with a mounting groove, the guide rail block is disposed in the mounting groove, and the chute is disposed on the guide rail block.
  8. 8. The linear motor module according to any one of claims 3 to 6, further comprising end covers, wherein accommodating cavities are respectively arranged at two ends of the protruding portion, the reflux device is arranged in the accommodating cavities, the end covers are arranged on end faces, away from the protruding portion, of the reflux device, and the end faces, away from the reflux device, of the end covers are flush with the end faces of the sliding table.
  9. 9. The linear motor module according to any one of claims 3 to 6, wherein an oil filling port is provided on a side surface of the slide table, an oil passage hole communicating with the oil filling port is provided on the boss, and lubricating oil injected from the oil filling port can flow into the passage hole through a gap between the oil passage hole, the return and the boss.
  10. 10. The linear motor module according to claim 1, wherein the outer walls of the two side walls of the linear motor base are provided with oil collecting grooves distributed along the length direction of the side walls, and the oil collecting grooves are located below the guide rail bars.

Description

Linear motor module Technical Field The invention relates to the field of linear modules, in particular to a linear motor module. Background In the automation industry, a linear module (such as a linear motor module, a screw rod linear module and a belt linear module) is one of common mechanical equipment on automation equipment, the linear module is subdivided into different names in different industries, the common names are a linear sliding table, an electric sliding table, a mechanical arm and the like, a sliding table is usually arranged on the linear module, other needed workpieces are arranged on the sliding table, a set of motor forward and backward rotation program (such as the screw rod linear module and the belt linear module) or a stator/rotor structure (such as the linear motor module) is arranged on the sliding table, and the work of automatic cyclic reciprocating motion of the workpieces can be realized, so that the purposes of mass production and intensive production of equipment are achieved. As shown in fig. 1, in the conventional linear module, the bottom 201 of the sliding table 200 is nested in the base 100, two outer side walls of the bottom 201 of the sliding table 200 are provided with arc-shaped guide rail grooves 202, inner walls of two side walls of the base 100 are respectively provided with arc-shaped guide rail grooves 101, the bottom 201 of the sliding table 200 is in rolling connection with the arc-shaped guide rail grooves 101 on the inner walls of the base 100 through steel balls 300 (balls) which roll circularly, the steel balls 300 roll infinitely circularly in a closed loop, sliding friction between the sliding table 200 and the base 100 is converted into rolling friction, and the sliding table 200 is in rolling connection with the base 100 through two rows of steel balls 300 (transversely), so that the sliding table 200 has five defects in bearing, rigidity, stability, anti-unbalanced load and installation tolerance although being cheap and small and light-weighted). 1. The radial/lateral bearing capacity is weak, two rows of steel balls can only bear pure radial load well, and lateral (left and right), reverse radial and overturning moment bearing is poor and easy to deform; 2. The rigidity is low, the deformation is easy, as only one row of steel balls are connected between one side of the bottom 201 of the sliding table 200 and the inner wall of the base 100, the contact points are few, the overall rigidity is low, the elastic deformation is large under heavy load, the positioning precision and the repeated positioning precision can be poor, the bending moment/torque resistance is weak, and the cantilever and the unbalanced load working condition are easy to shake; 3. The equal load is poor, the unbalanced load is easy to lose efficacy, the two rows of steel balls are in two-point contact, when the steel balls are subjected to upper, lower, left and right combined forces and overturning moment, the stress is very uneven, one side of the steel balls is easy to overload, the steel balls are easy to generate indentation, early fatigue occurs, and the steel balls are not suitable for the scene of large unbalanced load such as a gantry, a cantilever and multi-axis cutting; 4. The automatic centering is not needed, the requirement on the mounting surface is extremely high, the two rows of steel balls basically have no self-centering capability, and if the flatness and the parallelism of the mounting surface are slightly error, local pretightening is overlarge and friction force is increased rapidly Single-side abrasion, service life dip, running shake and noise increase, and two rows of steel balls completely depend on the base surface precision; 5. poor motion stability and precision retention, weak vibration resistance during high-speed acceleration and deceleration, easy occurrence of micro vibration and creeping, larger and faster clearance after abrasion, high precision attenuation speed, and poor smoothness under long stroke and high speed; 6. The service life is short under the same working condition, the load distribution is uneven, the contact stress is higher, the fatigue life is lower, and especially when the load is off-load and the installation is poor; 7. The device is limited in applicable scene, can only be used for light-load, low-speed, pure-radial and very good-installed-base-surface occasions (such as 3C, small-sized manipulators and miniature equipment), and is not suitable for equipment with heavy-duty automation, gantry, cutting and heavy-duty. Disclosure of Invention The present invention is directed to overcoming the above-mentioned drawbacks of the prior art, and providing a linear motor module for solving at least one of the above-mentioned problems. According to one aspect of the present invention, there is provided a linear motor module including a linear motor base, a sliding table and a plurality of steel balls, a stator is provided on an inn