A micro-motion device for eliminating two-dimensional errors of lead screw

Abstract

The present invention discloses a micro-motion device for eliminating two-dimensional errors of a lead screw, comprising a fluid-lubricated guide slider, a lead screw, a micro-motion assembly, a nut, a nut connection island and a slide connection seat. The present invention is connected between the lead screw and the fluid-lubricated guide slider by providing a micro-motion assembly as an intermediate connector, and the force transmitted by the lead screw to the nut will be transmitted to the micro-motion assembly. The micro-motion assembly can effectively solve the problem that the lead screw is not suitable for fluid-lubricated guides, reduce the manufacturing threshold of ultra-precision equipment, and effectively control the cost; the micro-motion assembly transmits the force transmitted by the lead screw to the nut seat to the nut connection island, and the deformation of the flexible unit can be compensated by the release groove, so that the force transmitted to the nut seat is very small, and the rigidity of the nut seat is also good, so that the force finally transmitted by the lead screw to the medium can be completely overcome by the medium rigidity, solving the problem that the running axes of the lead screw and the guide rail are not parallel.

Description

Technical Field

[0001] The invention relates to a micro-motion device, in particular to a micro-motion device used for eliminating two-dimensional errors of a lead screw, and belongs to the technical field of precision machining. Background Art

[0002] At present, with the widespread application and rapid development of aerospace technology, national defense technology and civil optical equipment, the demand for ultra-precision equipment in my country and the world is increasing. At the same time, domestic research on ultra-precision machine tools is at a critical stage, and many key technologies are being transformed from research and development to the product end. The spindle components of ultra-precision machine tools are the core to ensure the machining accuracy of water jets and ultra-precision machine tools. Ultra-precision machining requires extremely high rotation accuracy, smooth rotation and no vibration for the spindle.

[0003] However, during the use of ultra-precision machine tools, the fluid-lubricated guide rails of the machine tools need to be driven and moved by the rotation of the lead screw. For example, a lead screw guide rail driving device of a double-lead screw driven machine tool disclosed in announcement number CN102126154A includes a fixed part and a moving part; two guide rails are arranged in parallel on the fixed part, two lead screws are arranged in parallel on the inner sides of the two guide rails, one end of the two lead screws is connected to a driving motor arranged on the fixed part, and the other end of the two lead screws is arranged on the fixed part; the moving part is penetrated by the two lead screws, a nut threadedly connected to the lead screw is arranged on the moving part, and a screw that slides along the two guide rails is arranged on the moving part Slider, but the slight vibration caused by the ball circulation when the machine tool's lead screw is running will cause the fluid-lubricated guide rail to be unable to move smoothly, and thus cause the inability to operate with high precision. If an ordinary nut seat is used, the rotation of the lead screw will drive the nut to move in a straight line, and the nut is connected to the nut seat, and the nut seat is connected to the guide rail slider. At this time, the guide rail slider will also move in a straight line with the nut, and the force of the lead screw driving the nut will be transmitted to the slider. When the lead screw axis is not parallel to the guide rail, the slider will be offset during movement, so the force transmitted to the slider will drive the slider to form an offset. This offset is a two-dimensional offset, which will affect the running accuracy of the guide rail. Summary of the invention

[0004] The purpose of the present invention is to provide a micro-motion device for eliminating two-dimensional errors of a screw in order to solve at least one of the above-mentioned technical problems. The device can be equipped on a fluid-lubricated guide rail driven by a screw, mainly to solve the problem of non-parallel running axes of the screw and the guide rail, and can absorb the slight vibration caused by ball circulation when the screw is running, thereby ensuring the stability of the fluid-lubricated guide rail and thus high-precision operation.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions: a micro-motion device for eliminating two-dimensional errors of a lead screw, comprising a fluid-lubricated guide rail slider, a lead screw, a micro-motion assembly and a nut, the front and rear ends of the lead screw are rotatably connected to a front support seat of the lead screw and a rear support seat of the lead screw, the micro-motion assembly is sleeved on the lead screw, the nut is threadedly connected to the lead screw, the micro-motion assembly is connected to the nut, and the micro-motion assembly is connected to the fluid-lubricated guide rail slider;

[0006] The micro-motion assembly includes a flexible hinge point, a flexible unit and a nut seat. The nut seat includes a nut connecting island and a skateboard connecting seat. The nut connecting island is located on the inner side of the skateboard connecting seat. Several flexible units are arranged between the nut connecting island and the skateboard connecting seat. The end point docking position of every two flexible units is set as a flexible hinge point, and a release groove is opened on the flexible unit.

[0007] As a further solution of the present invention: the front and rear end sleeves of the screw are provided with bearings, and the front and rear end of the screw are rotationally connected to the front support seat and the rear support seat of the screw respectively through the bearings. The equipment connected to the front end of the screw includes but is not limited to a coupling, a reducer or a motor.

[0008] As a further solution of the present invention: the micro-motion assembly is connected to the nut via screws, and the micro-motion assembly is connected to the fluid-lubricated guide rail slider via screws.

[0009] As a further solution of the present invention: the micro-motion assembly is of a symmetrical structure, and each flexible unit of the micro-motion assembly connects the nut connection island and the slide plate connection seat together through four flexible hinge points.

[0010] As a further solution of the present invention: the release groove includes a lower release groove, an upper release groove, a middle release groove and a side release groove. The lower release groove, the upper release groove and the middle release groove are distributed up and down on the flexible unit, and side release grooves are provided at both ends of the flexible unit.

[0011] As a further solution of the present invention: fixing screw holes are provided at the four corners of the slide plate connecting seat of the nut seat.

[0012] As a further solution of the present invention: a sleeve through hole is provided at the center of the nut connection island of the nut seat, and a plurality of fixing screw holes are evenly distributed on the inner edge of the nut connection island.

[0013] The beneficial effects of the present invention are:

[0014] 1) The present invention provides a micro-motion component as an intermediate connecting piece connected between the lead screw and the fluid-lubricated guide rail slider, and the force transmitted from the lead screw to the nut is transmitted to the micro-motion component. The micro-motion component can effectively solve the problem that the lead screw is not suitable for the fluid-lubricated guide rail, thereby reducing the manufacturing threshold of ultra-precision equipment and effectively controlling the cost;

[0015] 2) The micro-motion assembly provided by the present invention includes a flexible hinge point, a flexible unit and a nut seat, and the nut seat includes a nut connection island and a slide connection seat. The force transmitted from the lead screw to the nut seat is transmitted to the nut connection island. Since the rigidity of the flexible unit is relatively weak, it will swing along the flexible hinge point in the direction of the force, including up and down, left and right or torsion in two-dimensional space. The deformation of the flexible unit can be compensated by the release groove, so that the force transmitted to the nut seat is very small. At the same time, the rigidity of the nut seat is also good, so that the force finally transmitted to the medium by the lead screw can be completely overcome by the rigidity of the medium, solving the problem that the running axes of the lead screw and the guide rail are not parallel.

[0016] 3) The micro-motion assembly provided in the present invention can solve the problem of the non-parallel running axes of the lead screw and the guide rail, and can absorb the slight vibration caused by the ball circulation when the lead screw is running, thereby ensuring the stability of the fluid-lubricated guide rail and enabling it to run with high precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the micro-motion device of the present invention applied to a fluid lubricated guide rail;

[0018] Figure 2 It is a schematic diagram of the structure of the micro-motion component of the present invention;

[0019] Figure 3 It is a schematic diagram of the local structure of the micro-motion component of the present invention.

[0020] In the figure: 1. front support seat of the screw, 2. fluid-lubricated guide slider, 3. screw, 4. screw, 5. micro-motion assembly, 51. flexible hinge hinge point, 52. flexible unit, 53. nut seat, 54. release groove, 541. lower release groove, 542. upper release groove, 543. middle release groove, 544. side release groove, 55. nut connecting island, 56. fixing screw hole, 57. slide plate connecting seat, 6. nut, 7. rear support seat of the screw. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Embodiment 1, as Figures 1 to 3As shown, a micro-motion device for eliminating two-dimensional errors of a lead screw comprises a fluid-lubricated guide rail slider 2, a lead screw 3, a micro-motion assembly 5 and a nut 6. The front and rear ends of the lead screw 3 are rotatably connected to a front support seat 1 and a rear support seat 7 of the lead screw, respectively. The micro-motion assembly 5 is sleeved on the lead screw 3, and the nut 6 is threadedly connected to the lead screw 3. The micro-motion assembly 5 is connected to the nut 6, and the micro-motion assembly 5 is connected to the fluid-lubricated guide rail slider 2. By using the micro-motion assembly 5 as an intermediate piece to connect the fluid-lubricated guide rail slider 2 and the nut 6, the force transmitted from the lead screw 3 to the nut 6 will be transmitted to the micro-motion assembly 5. The micro-motion assembly 5 can effectively solve the problem that the lead screw 3 is not suitable for the fluid-lubricated guide rail, thereby lowering the manufacturing threshold of ultra-precision equipment and effectively controlling the cost.

[0023] The micro-motion assembly 5 includes a flexible hinge point 51, a flexible unit 52 and a nut seat 53. The nut seat 53 includes a nut connection island 55 and a skateboard connection seat 57. The nut connection island 55 is located on the inner side of the skateboard connection seat 57. A number of flexible units 52 are arranged between the nut connection island 55 and the skateboard connection seat 57. The end point docking position of every two flexible units 52 is set as a flexible hinge hinge point 51. A release groove 54 is opened on the flexible unit 52. The rotation of the lead screw 3 will drive the nut 6 to move in a straight line, and the nut 6 is connected to the nut seat 53 of the micro-motion assembly 5. The nut seat 53 of the micro-motion assembly 5 is connected to the fluid-lubricated guide rail slider 2. At this time, the fluid-lubricated guide rail slider 2 will also move in a straight line with the nut 6. The force of the lead screw 3 driving the nut 6 will be transmitted to the fluid-lubricated guide rail slider 2. When the axis of the lead screw 3 is not parallel to the fluid-lubricated guide rail slider 2 in two-dimensional directions, the fluid-lubricated guide rail When the slider 2 moves in the oil film or air film medium surrounded on all sides, it will produce an offset, because although the medium is rigid, it is compressible and its rigidity is far less than that of the screw 3. Therefore, the force transmitted to the fluid-lubricated guide slider 2 will drive the slider to form an offset in the medium. This offset is also a two-dimensional offset, which will affect the running accuracy of the guide rail. The force transmitted to the nut seat 53 by the screw 3 is transmitted to the nut connecting island 55. Since the flexible unit 52 has weak rigidity, it will swing along the flexible hinge hinge 51 in the direction of the force, including up and down, left and right or torsion in two-dimensional space. The deformation of the flexible unit 52 can be compensated by the release groove 54, so that the force transmitted to the nut seat 53 is very small. At the same time, the rigidity of the nut seat 53 is also good, so that the force finally transmitted to the medium by the screw 3 can be completely overcome by the medium stiffness, solving the problem of the non-parallelism between the screw 3 and the guide rail running axis.

[0024] Embodiment 2. In addition to all the technical features of Embodiment 1, this embodiment also includes: bearings are provided at the front and rear ends of the screw 3, and the front and rear ends of the screw 3 are rotationally connected to the screw front support seat 1 and the screw rear support seat 7 respectively through bearings. The equipment connected to the front end of the screw 3 includes but is not limited to a coupling, a reducer or a motor, so that the screw 3 can rotate in the support seat, and then the screw 3 can be driven by the equipment connected to its front end to rotate stably, and the micro-motion device can be adapted to different working environments.

[0025] The micro-motion component 5 is connected to the nut 6 by means of screws 4, and the micro-motion component 5 is connected to the fluid-lubricated guide rail slider 2 by means of screws 4. The screws 4 can be used to firmly connect the micro-motion component 5 between the nut 6 and the fluid-lubricated guide rail slider 2, thereby absorbing the offset force generated by the nut during the rotation of the lead screw 3, thereby ensuring that the moving trajectory of the fluid-lubricated guide rail slider 2 will not be affected by the offset force.

[0026] The micro-motion component 5 has a symmetrical structure. Each flexible unit 52 of the micro-motion component 5 connects the nut connecting island 55 and the skateboard connecting seat 57 through four flexible hinge points 51. The flexible unit 52 can be regarded as a rhombus, and the four corners are four flexible hinge points 51. When the nut connecting island 55 is subjected to two-dimensional or three-dimensional forces, the rhombus will be deformed accordingly. When subjected to two-dimensional forces, it will show a two-dimensional offset. When subjected to three-dimensional forces, it will show a two-dimensional offset and a torsion in another direction. When the rhombus is deformed, the release groove 54 opened in the flexible unit 52 can provide a release space for the offset and torsion.

[0027] The release groove 54 includes a lower release groove 541, an upper release groove 542, a middle release groove 543 and a side release groove 544. The lower release groove 541, the upper release groove 542 and the middle release groove 543 are distributed up and down on the flexible unit 52. Side release grooves 544 are provided at both ends of the flexible unit 52. Since the flexible unit 52 itself has a certain rigidity, the release grooves 54 provided therein can provide a larger deformation amount. In addition, the release grooves 54 provided therein make the left and right circumferences form flexible hinge points again, providing secondary deformation.

[0028] Embodiment three, in addition to all the technical features of embodiment one, this embodiment also includes: fixing screw holes 56 are opened at the four corners of the slide connecting seat 57 of the nut seat 53, and the screws 4 are passed through the fixing screw holes 56 to form a multi-point fixed connection between the nut seat 53 of the micro-motion assembly 5 and the fluid-lubricated guide rail slider 2.

[0029] A sleeve through hole is provided at the center of the nut connecting island 55 of the nut seat 53, and a plurality of fixing screw holes 56 are evenly distributed on the inner edge of the nut connecting island 55. The fixing screw holes 56 facilitate the passage of the screws 4, thereby forming a multi-point fixed connection between the nut seat 53 of the micro-motion assembly 5 and the nut 6.

[0030] By using the micro-motion component 5 as an intermediate piece to connect the fluid-lubricated guide slider 2 and the nut 6, the force transmitted by the screw 3 to the nut 6 will be transmitted to the micro-motion component 5. The micro-motion component 5 can effectively solve the problem that the screw 3 is not suitable for the fluid-lubricated guide, lower the manufacturing threshold of ultra-precision equipment, and effectively control the cost. The force of the screw 3 driving the nut 6 will be transmitted to the fluid-lubricated guide slider 2. When the axis of the screw 3 is not parallel to the fluid-lubricated guide slider 2 in two-dimensional directions, the fluid-lubricated guide slider 2 will move in the oil film or air film medium surrounded on all sides. An offset is produced, and the force transmitted from the lead screw 3 to the nut seat 53 is transmitted to the nut connecting island 55. Since the rigidity of the flexible unit 52 is relatively weak, it will swing along the flexible hinge point 51 in the direction of the force, including up and down, left and right, or torsion in two-dimensional space. The deformation of the flexible unit 52 can be compensated by the release groove 54, so that the force transmitted to the nut seat 53 is very small. At the same time, the rigidity of the nut seat 53 is also relatively good, so that the force finally transmitted to the medium by the lead screw 3 can be completely overcome by the rigidity of the medium, thereby solving the problem that the running axis of the lead screw 3 and the guide rail are not parallel.

[0031] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0032] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A micro-motion device for eliminating two-dimensional errors of a lead screw, comprising a fluid-lubricated guide rail slider (2), a lead screw (3), a micro-motion assembly (5) and a nut (6), characterized in that: The front and rear ends of the lead screw (3) are rotatably connected to a lead screw front support seat (1) and a lead screw rear support seat (7), respectively; the micro-motion assembly (5) is sleeved on the lead screw (3); the nut (6) is threadedly connected to the lead screw (3); the micro-motion assembly (5) is connected to the nut (6); and the micro-motion assembly (5) is connected to the fluid-lubricated guide rail slider (2); The micro-motion assembly (5) comprises a flexible hinge point (51), a flexible unit (52) and a nut seat (53); the nut seat (53) comprises a nut connection island (55) and a slide connection seat (57); the nut connection island (55) is located on the inner side of the slide connection seat (57); a plurality of flexible units (52) are arranged between the nut connection island (55) and the slide connection seat (57); the end point butting portion of every two flexible units (52) is arranged as a flexible hinge point (51); and a release groove (54) is provided on the flexible unit (52); The front and rear ends of the lead screw (3) are sleeved with bearings, and the front and rear ends of the lead screw (3) are rotatably connected to the lead screw front support seat (1) and the lead screw rear support seat (7) respectively through the bearings. The equipment connected to the front end of the lead screw (3) includes but is not limited to a coupling, a reducer or a motor; The micro-motion component (5) is connected to the nut (6) via a screw (4), and the micro-motion component (5) is connected to the fluid-lubricated guide rail slider (2) via a screw (4); The micro-motion assembly (5) has a symmetrical structure, and each flexible unit (52) of the micro-motion assembly (5) connects the nut connection island (55) and the slide plate connection seat (57) together through four flexible hinge points (51); The release groove (54) comprises a lower release groove (541), an upper release groove (542), a middle release groove (543) and a side release groove (544); the lower release groove (541), the upper release groove (542) and the middle release groove (543) are arranged on the flexible unit (52) in an upper and lower distribution; and the side release grooves (544) are arranged at both ends of the flexible unit (52); The four corners of the slide connecting seat (57) of the nut seat (53) are provided with fixing screw holes (56); the center of the nut connecting island (55) of the nut seat (53) is provided with a sleeve through hole, and the inner side edge of the nut connecting island (55) is provided with a plurality of fixing screw holes (56) in a uniformly distributed manner.

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