阅读说明：本技术 一种机床丝杠预拉伸结构 (Machine tool lead screw prestretching structure ) 是由 胡早仁 王鹏 侯志勇 周明明 李铁峰 夏兴朝 于 2020-06-11 设计创作，主要内容包括：本发明涉及了一种机床丝杠预拉伸结构,包括床身和丝杠；所述丝杠的一端设置有与丝杠轴向固定的轴承座；所述轴承座的底部设置有凸起部,所述凸起部开设有与丝杠轴向相同方向的螺纹孔；所述床身上还固定有丝杠拉块；所述丝杠拉块上设置有通孔；通过拉杆穿过丝杠拉块的通孔与凸起部的螺纹孔螺纹连接,用于使轴承座向着靠近丝杠拉块移动,进而带动丝杠实现预拉伸。本发明的一种机床丝杠预拉伸结构,拉伸的过程中,丝杠的轴肩始终与轴承内圈相靠,避免传统的预拉伸方式的不足,使传动更加高效,精度保持性更高。(The invention relates to a pre-stretching structure of a machine tool lead screw, which comprises a machine tool body and a lead screw; a bearing seat axially fixed with the lead screw is arranged at one end of the lead screw; the bottom of the bearing seat is provided with a boss, and the boss is provided with a threaded hole in the same direction as the axial direction of the lead screw; a lead screw pulling block is also fixed on the lathe bed; the lead screw pulling block is provided with a through hole; the pull rod penetrates through a through hole of the lead screw pulling block to be in threaded connection with a threaded hole of the boss, and the bearing seat is used for moving towards the lead screw pulling block to further drive the lead screw to achieve prestretching. According to the machine tool lead screw pre-stretching structure, in the stretching process, the shaft shoulder of the lead screw is always leaned against the inner ring of the bearing, so that the defects of the traditional pre-stretching mode are avoided, the transmission is more efficient, and the precision retentivity is higher.)

1. The utility model provides a machine tool lead screw prestretches structure which characterized in that: comprises a lathe bed and a lead screw; a bearing seat axially fixed with the lead screw is arranged at one end of the lead screw; the bottom of the bearing seat is provided with a boss, and the boss is provided with a threaded hole in the same direction as the axial direction of the lead screw; a lead screw pulling block is also fixed on the lathe bed; the lead screw pulling block is provided with a through hole; the pull rod penetrates through a through hole of the lead screw pulling block to be in threaded connection with a threaded hole of the boss, and the bearing seat is used for moving towards the lead screw pulling block to further drive the lead screw to achieve prestretching.

2. The machine tool lead screw prestretching structure of claim 1, characterized in that: the lead screw is provided with a shaft shoulder; the lead screw is divided into a large-diameter section and a small-diameter section; a bearing is sleeved at the position of the small-diameter section, which is close to the shaft shoulder; the small-diameter section is also sleeved with an inner shaft sleeve and a locking nut; the locking nut is locked at the end part of the small-diameter section; one end of the inner shaft sleeve abuts against the inner ring of the bearing, and the other end of the inner shaft sleeve abuts against the locking nut; the bearing seat is sleeved outside the outer ring of the bearing and is fixed; the axial fixing device is used for axially fixing the bearing seat and the lead screw.

3. The machine tool lead screw prestretching structure of claim 2, characterized in that: an outer shaft sleeve is also arranged in the bearing seat; the bearing seat is also provided with a gland; one commercial outer shaft sleeve is abutted against the outer ring of the bearing, and the other end of the outer shaft sleeve is abutted against the press cover.

4. A machine tool screw pre-tensioning arrangement as claimed in claim 2 or 3, wherein: and a first dustproof cover is also fixed on the end face of the gland and positioned on the outer side of the locking nut.

5. The machine tool lead screw prestretching structure of claim 4, wherein: and a second dustproof cover is sleeved on the large-diameter section of the lead screw at a position close to the shaft shoulder.

6. The machine tool lead screw prestretching structure of claim 5, wherein: and an anti-collision block is arranged at the position of the large-diameter section of the screw rod, which is close to the second dustproof cover.

7. The machine tool lead screw prestretching structure of claim 1, characterized in that: the direction of the pull rod is parallel to the axial direction of the lead screw.

8. The machine tool lead screw prestretching structure of claim 7, wherein: the axis of the pull rod and the axis of the lead screw are positioned on the same vertical line.

9. The machine tool lead screw prestretching structure of claim 1, characterized in that: a platform for fixing the bearing seat is also arranged on the bed body; the platform also serves to guide the bearing housing as it is pulled.

Technical Field

The invention relates to the field of numerical control machining centers, in particular to a prestretching structure of a machine tool lead screw.

Background

In the traditional lead screw pre-stretching structure, a shaft shoulder at one end of a lead screw is enabled to be abutted against an inner ring of a bearing in a bearing seat, and a distance is reserved between the shaft shoulder at the other end of the lead screw and the inner ring of the bearing for stretching the lead screw.

Disclosure of Invention

In order to solve the technical problems, the invention provides a machine tool lead screw pre-stretching structure, in the stretching process, a shaft shoulder of a lead screw is always leaned against an inner ring of a bearing, the defects of the traditional pre-stretching mode are avoided, the transmission is more efficient, and the precision retentivity is higher.

The technical scheme adopted by the invention for solving the technical problems is as follows: a pre-stretching structure for a lead screw of a machine tool comprises a machine tool body and the lead screw; a bearing seat axially fixed with the lead screw is arranged at one end of the lead screw; the bottom of the bearing seat is provided with a boss, and the boss is provided with a threaded hole in the same direction as the axial direction of the lead screw; a lead screw pulling block is also fixed on the lathe bed; the lead screw pulling block is provided with a through hole; the pull rod penetrates through a through hole of the lead screw pulling block to be in threaded connection with a threaded hole of the boss, and the bearing seat is used for moving towards the lead screw pulling block to further drive the lead screw to achieve prestretching.

Further, the lead screw is provided with a shaft shoulder; the lead screw is divided into a large-diameter section and a small-diameter section; a bearing is sleeved at the position of the small-diameter section, which is close to the shaft shoulder; the small-diameter section is also sleeved with an inner shaft sleeve and a locking nut; the locking nut is locked at the end part of the small-diameter section; one end of the inner shaft sleeve abuts against the inner ring of the bearing, and the other end of the inner shaft sleeve abuts against the locking nut; the bearing seat is sleeved outside the outer ring of the bearing and is fixed; the axial fixing device is used for axially fixing the bearing seat and the lead screw.

Further, an outer shaft sleeve is arranged in the bearing seat; the bearing seat is also provided with a gland; one commercial outer shaft sleeve is abutted against the outer ring of the bearing, and the other end of the outer shaft sleeve is abutted against the press cover.

Furthermore, a first dustproof cover is further fixed on the end face of the gland and positioned on the outer side of the locking nut.

Furthermore, a second dust cover is sleeved on the large-diameter section of the lead screw at a position close to the shaft shoulder.

Furthermore, the large-diameter section of the screw rod is provided with an anti-collision block at a position close to the second dustproof cover.

Further, the direction of the pull rod is parallel to the axial direction of the lead screw.

Furthermore, the axis of the pull rod and the axis of the lead screw are positioned on the same vertical line.

Further, a platform for fixing the bearing seat is arranged on the bed body; the platform also serves to guide the bearing housing as it is pulled.

The invention has the beneficial effects that: according to the pre-stretching structure for the screw rod of the machine tool, the threaded hole is additionally formed in the bearing seat and is connected with the pulling block arranged on the machine tool body through the threaded hole through the bolt, the axial stretching of the screw rod is realized by the bearing seat through rotating the bolt, and in the stretching process, the shaft shoulder of the screw rod is always leaned against the inner ring of the bearing, so that the defects of the traditional pre-stretching mode are avoided, the transmission is more efficient, and the precision retentivity is higher; the pull rod is designed to be in the same axial direction with the lead screw, so that the pull rod can provide tension in the correct direction for the lead screw, and the axes of the pull rod and the lead screw are arranged to be positioned on the same vertical line, so that the left-right deflection caused in the uniaxial stretching process can be effectively prevented; the platform that is used for the bearing frame to fix that the lathe bed set up has axial plane on the platform, and not only installation location is convenient like this, also can provide the guide effect moreover in tensile process.

Drawings

FIG. 1 is a perspective view of a pre-stretching structure of a screw of a machine tool according to an embodiment;

FIG. 2 is a schematic top view of a pre-tensioning structure of a lead screw of a machine tool according to an embodiment;

FIG. 3 is a schematic cross-sectional view A-A of FIG. 2;

fig. 4 is a schematic cross-sectional view of B-B of fig. 2.

Detailed Description

For the purpose of enhancing the understanding of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and examples, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.