阅读说明：本技术 一种新型热管滚珠丝杠 (Novel heat pipe ball screw ) 是由 丁晓红 胡冕 于 2019-09-02 设计创作，主要内容包括：本发明公开了一种新型热管滚珠丝杠,涉及滚珠丝杠技术领域,包括丝杠本体、热管流道、工质、流道堵头。所述丝杠本体为轴类构件；所述丝杠本体包括外螺纹段；所述热管流道为一端封闭一端开口的孔状空腔,所述热管流道的第一端为封闭端,设置在所述丝杠本体的左端,所述热管流道的第二端为开口端,设置在所述丝杠本体的右端面上,所述热管流道在轴向方向上贯穿所述外螺纹段；所述流道堵头固定设置于所述热管流道的第二端面处,密封所述热管流道；所述热管流道内腔被抽成真空后注入所述工质。通过本发明的实施,能够有效减小丝杠表面温度梯度,抑制丝杠表面的温度波动,缩短丝杠达到热平衡的时间。(The invention discloses a novel heat pipe ball screw, which relates to the technical field of ball screws and comprises a screw body, a heat pipe runner, a working medium and a runner plug. The lead screw body is a shaft component; the lead screw body comprises an external thread section; the heat pipe runner is a hole-shaped cavity with one closed end and one opened end, the first end of the heat pipe runner is a closed end and is arranged at the left end of the screw rod body, the second end of the heat pipe runner is an opened end and is arranged on the right end face of the screw rod body, and the heat pipe runner penetrates through the external thread section in the axial direction; the flow channel plug is fixedly arranged at the second end face of the heat pipe flow channel and seals the heat pipe flow channel; and the working medium is injected into the inner cavity of the heat pipe flow channel after the inner cavity of the heat pipe flow channel is vacuumized. Through the implementation of the invention, the temperature gradient on the surface of the lead screw can be effectively reduced, the temperature fluctuation on the surface of the lead screw is inhibited, and the time for the lead screw to reach thermal equilibrium is shortened.)

1. The invention discloses a novel heat pipe ball screw, which comprises a screw body, a heat pipe flow passage, a working medium and a flow passage plug, wherein the screw body is an axial component; the lead screw body comprises an external thread section; the heat pipe runner is a hole-shaped cavity with one closed end and one opened end, the first end of the heat pipe runner is a closed end and is arranged at the left end of the screw rod body, the second end of the heat pipe runner is an opened end and is arranged on the right end face of the screw rod body, and the heat pipe runner penetrates through the external thread section in the axial direction; the flow channel plug is fixedly arranged at the second end face of the heat pipe flow channel and seals the heat pipe flow channel; and the working medium is injected into the inner cavity of the heat pipe flow channel after the inner cavity of the heat pipe flow channel is vacuumized.

2. The novel heat pipe ball screw of claim 1, wherein the screw body further comprises a connecting section, a first support section, a second support section, the first support section is arranged on the left side of the external thread section, the second support section is arranged on the right side of the external thread section, the connecting section is arranged on the left side of the first supporting section and is configured to be matched and connected with the output end of the motor, the first support segment is configured to limit axial and radial degrees of freedom of the lead screw body, the second support segment is configured to limit radial degrees of freedom of the lead screw body, the external thread section is configured to be matched with a nut to form a ball screw nut pair, and the axial distance between the first end face of the heat pipe runner and the left end face of the screw body is smaller than or equal to the sum of the axial lengths of the connecting section and the first supporting section.

3. The novel heat pipe ball screw of claim 2, wherein the cross-sectional shape of the heat pipe flow channels is circular, regular polygon, ellipse or zigzag, and the number of the heat pipe flow channels is greater than or equal to 1.

4. The novel heat pipe ball screw of claim 3, wherein when the number of the heat pipe runners is 1, the central axis of the heat pipe runner coincides with the central axis of the screw body.

5. the novel heat pipe ball screw according to claim 3, wherein when the number of the heat pipe flow channels is greater than 1, the heat pipe flow channels are distributed on the radial section of the screw body in a centrosymmetric and uniform manner, and the first ends of two adjacent heat pipe flow channels are communicated or not communicated.

6. A novel heat pipe ball screw as claimed in claim 4 or 5, wherein said working medium is analytically pure absolute ethanol.

7. The novel heat pipe ball screw of claim 6, wherein the volume ratio of the working medium to the inner cavity of the heat pipe flow channel is greater than or equal to 1/6 and less than or equal to 1/2.

8. a novel heat pipe ball screw according to claim 7, wherein the vacuum degree of the inner cavity of the heat pipe flow passage is 0.13-0.0013 Pa.

9. The novel heat pipe ball screw of any one of claims 1 to 5, further comprising a wick, wherein the wick is fixedly disposed on the inner cavity wall of the heat pipe flow channel, and the wick is a multi-layer mesh wick.

10. The novel heat pipe ball screw of any one of claims 1 to 5, wherein the fixing mode of the flow channel plug is a welding mode.

Technical Field

The invention relates to the technical field of ball screws, in particular to a novel heat pipe ball screw.

Background

In a feeding system of a precision machine tool, a ball screw pair transmission system is a main form of a driving system, and in the transmission process of the ball screw pair, a large amount of heat is generated in a contact area (a screw nut, a bearing and the like), so that a thermal deformation error is generated on a screw to influence the machining precision of the machine tool and the transmission rigidity of the feeding system; the higher the rotating speed of the screw rod is, the more serious the thermal deformation is, so that the machining precision of the machine tool is reduced; in various machine tools, the thermal deformation error accounts for about 30-50% of the total error; therefore, in a precision machine tool feed system, the thermal deformation of the ball screw must be controlled.

At present, a hollow ball screw is generally adopted, and heat generated is taken away through flowing cooling liquid in a hollow cavity inside the ball screw, so that the thermal deformation of the screw is reduced. The cooling method has the problems of large temperature gradient and temperature fluctuation of the surface of the ball screw and long time for reaching the thermal equilibrium, and the defects limit the application of the ball screw in the high-precision field.

Therefore, those skilled in the art are dedicated to develop a novel heat pipe ball screw, which can effectively reduce the temperature gradient on the surface of the screw, inhibit the temperature fluctuation on the surface of the screw, and shorten the time for the screw to reach thermal equilibrium.

Disclosure of Invention

In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is how to overcome the problems of the prior cooling method that the temperature gradient and the temperature fluctuation of the surface of the ball screw are large and the time for reaching the thermal equilibrium is long.

In order to achieve the purpose, the invention discloses a novel heat pipe ball screw, which relates to the technical field of ball screws and comprises a screw body, a heat pipe runner, a working medium and a runner plug, wherein the screw body is an axial component; the lead screw body comprises an external thread section; the heat pipe runner is a hole-shaped cavity with one closed end and one open end, the first end of the heat pipe runner is a closed end and is arranged at the left end of the screw rod body, the second end of the heat pipe runner is an open end and is arranged on the right end face of the screw rod body, and the heat pipe runner penetrates through the external thread section in the axial direction; the flow channel plug is fixedly arranged at the second end face of the heat pipe flow channel and seals the heat pipe flow channel; and the working medium is injected into the inner cavity of the heat pipe flow channel after the inner cavity of the heat pipe flow channel is vacuumized.

further, the screw body still includes linkage segment, first support section, second support section, first support section sets up the external screw thread section left side, the second support section sets up the external screw thread section right side, the linkage segment sets up the first support section left side, the linkage segment is configured to be connected with the cooperation of motor output, first support section is configured to the axial and radial degree of freedom of restriction screw body, the second support section is configured to the restriction the radial degree of freedom of screw body, the external screw thread section is configured to constitute ball screw nut pair with the nut cooperation, the axial distance of heat pipe runner first terminal surface with the screw body left end face is less than or equal to the axial length sum of linkage segment and first support section.

Further, the cross section of the heat pipe flow channel is circular, regular polygon, ellipse or zigzag, and the number of the heat pipe flow channels is more than or equal to 1.

Further, when the number of the heat pipe runners is 1, the central axis of the heat pipe runner coincides with the central axis of the lead screw body.

Further, when the number of the heat pipe runners is larger than 1, the heat pipe runners are symmetrically and uniformly distributed on the radial section of the screw body in a central mode, and the first ends of the two adjacent heat pipe runners are communicated or not communicated.

Furthermore, the working medium is analytically pure absolute ethyl alcohol.

Furthermore, the volume ratio of the working medium to the inner cavity of the heat pipe runner is more than or equal to 1/6 and less than or equal to 1/2.

Further, the vacuum degree of the inner cavity of the heat pipe flow channel is 0.13-0.0013 Pa.

The liquid absorption core is fixedly arranged on the inner cavity wall of the heat pipe flow channel and is a multilayer netted pipe core.

Furthermore, the fixing mode of the flow channel plug is a welding mode.

Compared with the prior art, the implementation of the invention achieves the following obvious technical effects:

1. The invention applies the heat pipe to the ball screw, can effectively reduce the temperature gradient on the surface of the screw, inhibit the temperature fluctuation on the surface of the screw and shorten the time for the screw to reach thermal balance.

2. The invention optimizes the structural form and the arrangement mode of the heat pipes on the ball screw, not only improves the heat dissipation capacity of the ball screw, but also has the advantages of simple structure and easy manufacture.

The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.

Drawings

FIG. 1 is a three-dimensional schematic of a preferred embodiment of the invention;

FIG. 2 is a three-dimensional schematic view of a conventional liquid-cooled lead screw structure;

FIG. 3 is a graph of the temperature of a surface measurement point versus time in accordance with a preferred embodiment of the present invention.

Wherein: 1-the left end face of the screw body, 2-the connecting section, 3-the first supporting section, 4-the external thread section, 5-the second supporting section, 6-the right end face of the screw body, 7-the liquid inlet, 8-the liquid outlet.

Detailed Description

The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.

In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity. In order to ensure clarity and conciseness of the attached images, some devices are not shown in the drawings, but do not affect the understanding of the invention by those of ordinary skill in the relevant art.