阅读说明：本技术 一种双驱动型滑动螺旋传动副及其构成的微量进给装置 (Dual-drive sliding screw transmission pair and micro-feeding device formed by same ) 是由 李慧 孙德鹏 *** 杜付鑫 李沛刚 冯显英 于 2019-08-07 设计创作，主要内容包括：本发明公开了一种双驱动型滑动螺旋传动副及其构成的微量进给装置,包括丝杠和丝杠螺母；所述的螺母安装在丝杠上与丝杠螺纹配合,在所述螺母的外圈安装第一轴承和第二轴承,所述的第一轴承、第二轴承的内圈与所述螺母配合,轴承外圈与螺母套配合；第一轴承、第二轴承之间通过套筒定位,其中第一轴承的内圈通过螺母外圈的凸缘定位,外圈通过轴承端盖定位；第二轴承的内圈通过与所述丝杠螺母配合的螺母定位,第二轴承的外圈通过螺母套上的凸缘定位。(The invention discloses a double-drive sliding screw transmission pair and a micro-feeding device formed by the same, wherein the double-drive sliding screw transmission pair comprises a screw rod and a screw rod nut; the nut is arranged on the screw rod and is in threaded fit with the screw rod, the outer ring of the nut is provided with a first bearing and a second bearing, the inner rings of the first bearing and the second bearing are matched with the nut, and the outer ring of the bearing is matched with the nut sleeve; the first bearing and the second bearing are positioned through a sleeve, wherein an inner ring of the first bearing is positioned through a flange of an outer ring of the nut, and the outer ring is positioned through a bearing end cover; the inner ring of the second bearing is positioned through a nut matched with the screw nut, and the outer ring of the second bearing is positioned through a flange on the nut sleeve.)

1. a sliding screw transmission pair capable of realizing double driving is characterized by comprising a screw rod and a screw rod nut; the nut is arranged on the screw rod and is in threaded fit with the screw rod, the outer ring of the nut is provided with a first bearing and a second bearing, the inner rings of the first bearing and the second bearing are in interference fit with the nut, and the outer ring of the bearing is in interference fit with the nut sleeve; the first bearing and the second bearing are positioned through a sleeve, and the sleeve is in key connection with the screw nut; the inner ring of the first bearing is positioned through a flange of the outer ring of the nut, and the outer ring of the first bearing is positioned through a bearing end cover; the inner ring of the second bearing is positioned through a nut matched with the screw nut, and the outer ring of the second bearing is positioned through a flange on the nut sleeve.

2. The sliding screw drive pair capable of realizing a double drive type according to claim 1, wherein the first bearing and the second bearing are angular contact ball bearings capable of receiving radial force and axial force, respectively.

3. The sliding screw drive pair capable of realizing a double drive type according to claim 1, wherein the nut and the nut case are sealed by a seal ring.

4. The sliding screw drive pair capable of realizing the double drive type according to claim 1, wherein the screw nut includes a first screw nut and a second screw nut, and the first screw nut and the second screw nut have the same thread direction but different screw drive surfaces engaged with the screw.

5. the sliding screw drive pair capable of realizing the double drive type according to claim 1, wherein the nut housing is a flange housing, and a threaded hole is provided on the flange housing, and the threaded hole is used for connecting with other moving table connecting seats.

6. The sliding screw transmission pair capable of realizing the double driving type according to claim 1, wherein the lead screw nut is connected with a synchronous pulley, a gear or a direct-drive hollow shaft servo motor to realize the main driving of the lead screw nut; meanwhile, the screw rod can be directly connected with the servo motor through a coupler or connected with the servo motor through a gear or a synchronous belt pulley, so that main driving of the screw rod is realized, double driving of the nut and the screw rod is further realized, and a double-driving servo system is formed.

7. The sliding screw transmission pair capable of realizing the double drive type according to claim 6, wherein when a direct-drive hollow shaft servo motor is selected as a nut power source, the lead screw penetrates through a hollow shaft of the direct-drive hollow shaft servo motor.

8. A machine tool comprising the sliding screw transmission pair capable of realizing a dual drive type according to any one of claims 1 to 7.

Technical Field

The invention discloses a sliding screw transmission pair capable of realizing double driving and a micro-feeding device.

Background

At present, a sliding type screw-nut pair basically only uses a screw as a driving part, and the rotation of the screw is converted into the linear motion of a nut; the problem with this screw drive is that: although the structure is simple and the manufacturing cost is low, the transmission efficiency is low, the sensitivity and the transmission precision are low, the low-speed performance is poor and the creeping phenomenon is easy to generate due to large friction resistance moment.

Disclosure of Invention

In order to solve the technical problems in the prior art, the invention provides a novel low-cost double-drive sliding type screw drive pair, a low-cost high-precision micro-feeding servo system, which greatly improves the low-speed performance and the drive precision, can form a single-shaft and multi-shaft high-precision motion control platform, and can be widely used in high-end precision numerical control equipment such as a numerical control lathe, a numerical control milling machine, a numerical control grinding machine, IC preparation and various machining centers and the like and fields such as precise positioning, tracking and detection under the control of high-precision motion.

the technical scheme adopted by the invention is as follows:

The invention provides a sliding screw transmission pair capable of realizing double driving, which comprises a screw rod and a screw rod nut; the nut is arranged on the screw rod and is in threaded fit with the screw rod, the outer ring of the nut is provided with a first bearing and a second bearing, the inner rings of the first bearing and the second bearing are matched with the nut, and the outer ring of the bearing is matched with the nut seat; the first bearing and the second bearing are positioned through a sleeve, wherein an inner ring of the first bearing is positioned through a flange of an outer ring of the nut, and the outer ring is positioned through a bearing end cover; the inner ring of the second bearing is positioned through a nut matched with the screw nut, and the outer ring of the second bearing is positioned through a flange on the nut sleeve.

as a further technical scheme, the first bearing and the second bearing are angular contact ball bearings and can bear axial force and radial force.

As a further technical scheme, the nut and the nut sleeve are sealed through a sealing ring.

As a further technical scheme, the lead screw nut comprises a first lead screw nut and a second lead screw nut, and the screw thread turning directions of the first lead screw nut and the second lead screw nut are the same.

As a further technical scheme, a threaded hole is formed in the nut sleeve and is used for being connected with the workbench connecting seat.

As a further technical scheme, the screw nut is connected with a synchronous belt pulley, a gear or a direct-drive hollow shaft servo motor to drive the nut. Meanwhile, one end of the screw rod is directly connected with the servo motor or is in transmission connection with the servo motor through a gear or a synchronous belt, and the screw rod is driven.

as a further technical scheme, for the direct-drive hollow servo motor, a hollow shaft (rotor) is directly connected with a screw nut through a nut end flange structure, a hollow stator matched with the rotor is directly connected with a nut sleeve through a nut sleeve end flange, and a screw penetrates through the hollow shaft of the direct-drive hollow servo motor.

The invention also provides a micro-feeding device for controlling linear motion of various machine tools, which comprises the sliding screw transmission pair capable of realizing double driving, wherein the lead screw is driven by the first servo motor, and the lead screw nut is driven by the second servo motor.

The invention has the following beneficial effects:

1) The invention overcomes the defect that the conventional screw nut pair can only be used as a main driving piece by a screw.

2) The first bearing and the second bearing in the nut sleeve are supported on the screw nut, and the bearings can bear axial force and radial force; so that the lead screw and the nut can be used as main driving type elements.

3) The micro-feeding device based on the new transmission pair can realize micro-feeding motion with lower crawling speed through double-drive differential motion, thereby obtaining better low-speed performance at lower cost, and having the characteristics of high rigidity, large stroke and the like.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.

FIG. 1 is a schematic of a two-dimensional structure of the present invention;

FIG. 2 is a schematic of the three-dimensional structure of the present invention;

In the figure: 1-nut sleeve; 2-bearing end cap A; 3-a first sealing ring; 4-a first lead screw nut; 5-synchronous belt pulley; 6-angular contact ball bearing; 7, a sleeve; 8-a second sealing ring; 9- -round nut; 10-a second lead screw nut; 11-lead screw.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;

For convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate correspondence with up, down, left and right directions of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

As described in the background of the invention, there are disadvantages in the prior art, and in order to solve the above technical problems, the present application proposes a sliding screw transmission pair and a micro-feeding device capable of implementing a dual driving type.

In an exemplary embodiment of the present application, as shown in fig. 1 and fig. 2, a sliding screw transmission pair capable of realizing a dual drive type includes a screw 11 and a screw nut; the nut is arranged on the screw rod and is in threaded fit with the screw rod, the outer ring of the nut is provided with a first bearing and a second bearing, the inner rings of the first bearing and the second bearing are matched with the nut, and the outer ring of the bearing is matched with the nut sleeve; the first bearing and the second bearing are positioned through a sleeve 7, wherein the inner ring of the first bearing is positioned through a flange of the outer ring of the nut, and the outer ring is positioned through the bearing end cover 2; the bearing end cover 2 and the lead screw nut are sealed through a sealing ring 3; the inner ring of the second bearing is positioned through a nut matched with the screw nut, and the outer ring of the second bearing is positioned through a flange on the nut sleeve.

As a further technical scheme, the first bearing and the second bearing are angular contact ball bearings and can bear axial force and radial force.

As a further technical scheme, the round nut and the nut sleeve are sealed through a sealing ring 8, and the sealing ring 8 is placed in a groove on the nut sleeve 1.

further, the lead screw nut in this embodiment includes a first lead screw nut 4 and a second lead screw nut 10, the thread turning directions of the first lead screw nut 4 and the second lead screw nut 10 are the same, and the synchronism of the rotation of the two nuts is ensured through key connection. The round nut 9 and the end cover 2 are provided with inner threads and outer threads and used for jointly pre-tightening to eliminate transmission gaps between the first nut and the lead screw, the second nut and the lead screw, and left and right spiral surfaces of the first lead screw nut 4 and the second lead screw nut 10 are respectively meshed with right and left spiral surfaces of the lead screw 11, so that positive and negative gapless transmission is realized. In the drawing, the first lead screw nut 4 is positioned at the right side of the lead screw, and the second lead screw nut 10 is positioned at the left side of the lead screw; the inner ring of the first bearing is in interference fit with the first lead screw nut, and a flange is arranged at the right end part of the first lead screw nut 4 and used for positioning the inner ring of the first bearing; the inner ring of the second bearing is in interference fit with a second lead screw nut 10, a round nut 9 in threaded fit with the second lead screw nut 10 is arranged at the left end of the second lead screw nut 10, threads are machined on the outer surface of the bearing end cover 2, and the end cover 2 and the round nut 9 are used for pre-tightening the first bearing and the second bearing when screwed to a certain position;

As a further technical scheme, the right end of the nut sleeve is of a flange structure, the flange is provided with a threaded hole, the threaded hole is used for being connected with other connecting seats, for example, the threaded hole is connected with a workbench supporting seat, and the workbench supporting seat is connected with a workbench.

As a further technical scheme, the screw nut is connected with a synchronous belt pulley, a gear or a direct-drive hollow shaft servo motor to drive the screw nut; the figure shows a schematic structural diagram when the synchronous pulley 5 is connected, and the synchronous pulley 5 is connected with a servo motor to realize the rotation of a screw nut;

When the screw nut is connected with the direct-drive hollow servo motor, the screw penetrates through a hollow shaft of the direct-drive hollow servo motor.

A timing pulley 5 is attached to the flange of the first lead screw nut 4.

The invention also provides a micro-feeding device, which comprises the sliding screw transmission pair capable of realizing double driving, wherein the lead screw is driven by a first servo motor, and the lead screw nut is driven by a second servo motor; double driving is realized.

the above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.