阅读说明：本技术 一种机床主轴及数控机床 (Machine tool spindle and numerical control machine tool ) 是由 蔡雪芝 黄楠铭 许东伟 于 2021-09-17 设计创作，主要内容包括：本发明涉及机床设备技术领域,公开一种机床主轴及数控机床,该机床主轴包括轴体、壳体、导热螺杆和导热管,所述壳体上设置有第一轴承和第二轴承,所述壳体上设置有换热腔,所述换热腔内填充有导热介质,所述第一轴承的外圈和第二轴承的外圈上分别设置有与导热螺杆相配对的第一螺孔和第二螺孔,所述壳体上设置有接驳螺孔,所述导热螺杆末端伸出于第二螺孔外并设置有防松螺母,所述壳体上设置有定位槽和与导热管相配对的安装孔,所述导热管与导热螺杆相平行,所述定位槽内设置有气泵体,所述导热管的一端插入气泵体的排气管内,所述气泵体的抽气管与外界相连通,所述导热管的另一端与外界相连通；该机床主轴的轴承冷却效果好。(The invention relates to the technical field of machine tool equipment, and discloses a machine tool main shaft and a numerical control machine tool, the machine tool main shaft comprises a shaft body, a shell, a heat conducting screw rod and a heat conducting pipe, a first bearing and a second bearing are arranged on the shell, a heat exchange cavity is arranged on the shell, a heat conducting medium is filled in the heat exchange cavity, a first screw hole and a second screw hole which are matched with the heat conducting screw rod are respectively arranged on an outer ring of the first bearing and an outer ring of the second bearing, a connection screw hole is arranged on the shell, the tail end of the heat conducting screw rod extends out of the second screw hole and is provided with a locknut, a positioning groove and a mounting hole which is matched with the heat conducting pipe are arranged on the shell, the heat conducting pipe is parallel to the heat conducting screw rod, an air pump body is arranged in the positioning groove, one end of the heat conducting pipe is inserted into an exhaust pipe of the air pump body, and an exhaust pipe of the air pump body is communicated with the outside, the other end of the heat conduction pipe is communicated with the outside; the bearing of the machine tool spindle has a good cooling effect.)

1. The utility model provides a machine tool spindle, includes axis body and casing, be provided with first bearing and second bearing on the casing, the axis body rotates through first bearing and second bearing and casing to be connected its characterized in that: also comprises a heat conducting screw and a heat conducting pipe;

the shell is provided with a heat exchange cavity, a heat conducting medium is filled in the heat exchange cavity, the outer ring of the first bearing and the outer ring of the second bearing are respectively provided with a first screw hole and a second screw hole which are matched with the heat conducting screw rod, the shell is provided with a connection screw hole, the first screw hole and the second screw hole are communicated with the heat exchange cavity through the connection screw holes, the heat conducting screw rod is sequentially screwed into the first screw hole, the connection screw hole and the second screw hole, the tail end of the heat conducting screw rod extends out of the second screw hole and is provided with a lock nut, and the heat conducting screw rod penetrates through the heat exchange cavity and is contacted with the heat conducting medium in the heat exchange cavity;

the heat exchange device comprises a shell and is characterized in that a positioning groove and a mounting hole matched with a heat conduction pipe are formed in the shell, the mounting hole is communicated with a heat exchange cavity, the heat conduction pipe is inserted into the mounting hole and penetrates through the heat exchange cavity, the heat conduction pipe is in contact with a heat conduction medium in the heat exchange cavity, the heat conduction pipe is parallel to a heat conduction screw rod, an air pump body is arranged in the positioning groove and is fixedly connected with the shell, one end of the heat conduction pipe is inserted into an exhaust pipe of the air pump body, an exhaust pipe of the air pump body is communicated with the outside, and the other end of the heat conduction pipe is communicated with the outside.

2. A machine tool spindle according to claim 1, wherein: the heat conduction screw is provided with a groove body on the thread in the heat exchange cavity, and the groove body is communicated with the heat exchange cavity.

3. A machine tool spindle according to claim 2, wherein: the heat conduction screw head end is provided with the nut body, heat conduction screw and nut body formula as an organic whole set up, be provided with first reaming and second reaming on the terminal surface of first bearing and second bearing respectively, first reaming is linked together with first screw, the second reaming with the second screw is linked together, all be provided with the encapsulation layer in first reaming and the second reaming, encapsulation layer and heat conduction screw fixed connection, be provided with the filling hole on the nut body, the filling hole is linked together with first reaming.

4. A machine tool spindle according to claim 3, wherein: be provided with the heat conduction return bend on the casing, heat conduction return bend one end and casing fixed connection, the heat conduction return bend is linked together with the heat pipe, the heat conduction return bend other end is provided with the duckbilled valve, the air that the duckbilled valve jetted out is configured into the inner circle of directional second bearing.

5. A machine tool spindle according to claim 4 in which: and the inner ring of the second bearing is provided with a mounting groove at the pointed part of the duckbill valve.

6. A machine tool spindle according to claim 5 in which: the mounting groove is internally provided with foamed aluminum, the mounting groove and the foamed aluminum are both arranged in an annular shape, and the foamed aluminum is bonded with the groove bottom of the mounting groove.

7. A machine tool spindle according to claim 6 in which: the heat conducting pipe is internally filled with a heat conductor.

8. A machine tool spindle according to claim 7 in which: the heat conductor includes first heat conduction net and second heat conduction net, be provided with the conducting wire between first heat conduction net and the second heat conduction net, the conducting wire both ends respectively with first heat conduction net and second heat conduction net welding, first heat conduction net and second heat conduction net form the sandwich structure body through the conducting wire, the sandwich structure body is convoluteed and heat conduction pipe clearance fit's tubular structure, and first heat conduction net wraps the setting of second heat conduction net.

9. A machine tool spindle according to claim 8, wherein: a heat conduction silicone grease layer is arranged between the heat conduction pipe and the first heat conduction net, and the end part of the first heat conduction net is welded with the heat conduction pipe.

10. A kind of numerical control machine tool, characterized by: comprising a machine spindle according to any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of machine tool equipment, in particular to a machine tool spindle and a numerical control machine tool.

Background

The main shaft of the machine tool refers to a shaft on the machine tool for driving a workpiece or a cutter to rotate. Usually consists of a main shaft, a bearing, a transmission piece and the like. The machine is mainly used for supporting transmission parts such as gears and belt wheels, transmitting motion and torque, and clamping workpieces, and except for machine tools with rectilinear motion of main motion such as planers and broaches, most of the machine tools are provided with spindle parts. The maximum allowable rotating speed and the range of the rotating speed of the spindle unit are mainly determined by the structure, lubrication and heat dissipation conditions of the bearing, and the bearing balls expand due to the temperature rise of the outer ring and the inner ring of the bearing caused by friction during operation, which affects the machining precision, so that the heat dissipation of the bearing is one of the directions that have been studied by those skilled in the art.

Disclosure of Invention

The invention aims to provide a machine tool spindle and a numerical control machine tool with a good bearing cooling effect.

In order to solve the problems, the invention adopts the following technical scheme:

a machine tool spindle comprises a spindle body, a shell, a heat conduction screw and a heat conduction pipe, wherein a first bearing and a second bearing are arranged on the shell, and the spindle body is rotationally connected with the shell through the first bearing and the second bearing;

the shell is provided with a heat exchange cavity, a heat conducting medium is filled in the heat exchange cavity, the outer ring of the first bearing and the outer ring of the second bearing are respectively provided with a first screw hole and a second screw hole which are matched with the heat conducting screw rod, the shell is provided with a connection screw hole, the first screw hole and the second screw hole are communicated with the heat exchange cavity through the connection screw holes, the heat conducting screw rod is sequentially screwed into the first screw hole, the connection screw hole and the second screw hole, the tail end of the heat conducting screw rod extends out of the second screw hole and is provided with a lock nut, and the heat conducting screw rod penetrates through the heat exchange cavity and is contacted with the heat conducting medium in the heat exchange cavity;

the heat exchange device comprises a shell and is characterized in that a positioning groove and a mounting hole matched with a heat conduction pipe are formed in the shell, the mounting hole is communicated with a heat exchange cavity, the heat conduction pipe is inserted into the mounting hole and penetrates through the heat exchange cavity, the heat conduction pipe is in contact with a heat conduction medium in the heat exchange cavity, the heat conduction pipe is parallel to a heat conduction screw rod, an air pump body is arranged in the positioning groove and is fixedly connected with the shell, one end of the heat conduction pipe is inserted into an exhaust pipe of the air pump body, an exhaust pipe of the air pump body is communicated with the outside, and the other end of the heat conduction pipe is communicated with the outside.

Preferably, a groove body is arranged on the thread of the heat conduction screw rod in the heat exchange cavity, and the groove body is communicated with the heat exchange cavity.

Preferably, the head end of the heat conduction screw is provided with a nut body, the heat conduction screw and the nut body are arranged in an integrated mode, the end faces of the first bearing and the second bearing are respectively provided with a first hole expanding layer and a second hole expanding layer, the first hole expanding layer is communicated with the first screw hole, the second hole expanding layer is communicated with the second screw hole, the first hole expanding layer and the second hole expanding layer are respectively internally provided with a sealing layer, the sealing layers are fixedly connected with the heat conduction screw, the nut body is provided with an injection hole, and the injection hole is communicated with the first hole expanding layer.

Preferably, a heat conduction bent pipe is arranged on the shell, one end of the heat conduction bent pipe is fixedly connected with the shell, the heat conduction bent pipe is communicated with the heat conduction pipe, a duckbill valve is arranged at the other end of the heat conduction bent pipe, and air ejected by the duckbill valve is configured to point to the inner ring of the second bearing.

Preferably, the inner race of the second bearing is provided with a mounting groove where directed by the duckbill valve.

Preferably, the installation groove is internally provided with foamed aluminum, the installation groove and the foamed aluminum are both arranged in an annular shape, and the foamed aluminum is bonded with the groove bottom of the installation groove.

Preferably, the heat conducting pipe is filled with a heat conductor, and the heat conductor is welded with the heat conducting pipe.

As preferred, the heat conductor includes first heat conduction net and second heat conduction net, be provided with the conducting wire between first heat conduction net and the second heat conduction net, the conducting wire both ends respectively with first heat conduction net and second heat conduction net welding, first heat conduction net and second heat conduction net pass through the conducting wire and form the sandwich structure body, the sandwich structure body is convoluteed into and is wrapped the setting of second heat conduction net with heat conduction pipe clearance fit's tubular structure, first heat conduction net.

Preferably, a heat-conducting silicone grease layer is arranged between the heat-conducting pipe and the first heat-conducting net, and the end part of the first heat-conducting net is welded with the heat-conducting pipe.

The invention also provides a numerical control machine tool, which comprises the machine tool spindle.

The invention has the beneficial effects that: the heat that first bearing and second bearing during operation produced can be equipped with the gas pump body constantly with in the heat-conducting medium of heat transfer chamber is transmitted the heat-conducting medium to the heat transfer chamber through the heat conduction screw rod in, with heat-conducting medium's heat transfer to the external world in for whole has better heat-sinking capability, can effectually avoid first bearing and second bearing overheated and lead to the expanded condition to appear.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a cross-sectional view of a spindle of a machine tool according to the present invention.

Fig. 2 is an enlarged view of a point a in fig. 1.

Fig. 3 is an enlarged view at B in fig. 1.

Fig. 4 is an enlarged view at C in fig. 1.

Fig. 5 is a partial structural schematic view of a housing of a spindle of a machine tool according to the present invention.

Fig. 6 is a side view of a heat transfer pipe of a machine tool spindle according to the present invention.

Fig. 7 is a partial structural schematic view of a heat-conducting screw of a machine tool spindle according to the present invention.

In the figure:

1. a shaft body; 2. a housing; 3. a heat conducting screw; 4. a heat conducting pipe; 5. a first bearing; 6. a second bearing; 7. a heat-conducting medium; 8. a locknut; 9. positioning a groove; 10. a gas pump body; 11. screw teeth; 12. a trough body; 13. a nut body; 14. a potting layer; 15. an injection hole; 16. a heat conducting bent pipe; 17. a duckbill valve; 18. mounting grooves; 19. a first thermally conductive mesh; 20. a second thermally conductive mesh; 21. and (4) heat-conducting wires.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the embodiments, it should be understood that the terms "middle", "upper", "lower", "top", "right", "left", "above", "back", "middle", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In addition, in the description of the present application, it should be noted that unless otherwise explicitly stated or limited, terms such as mounting, connecting and the like should be construed broadly, and for example, may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

As shown in fig. 1 to 7, a machine tool spindle includes a spindle body 1, a housing 2, a heat conducting screw 3 and a heat conducting pipe 4, wherein a first bearing 5 and a second bearing 6 are arranged on the housing 2, and the spindle body 1 is rotatably connected with the housing 2 through the first bearing 5 and the second bearing 6;

a heat exchange cavity (not shown) is arranged on the shell 2, a heat-conducting medium 7 is filled in the heat exchange cavity, a first screw hole (not shown) and a second screw hole (not shown) which are matched with the heat-conducting screw rod 3 are respectively arranged on the outer ring of the first bearing 5 and the outer ring of the second bearing 6, a connection screw hole (not shown) is arranged on the shell 2, the first screw hole and the second screw hole are communicated with the heat exchange cavity through the connection screw holes, the heat-conducting screw rod 3 is sequentially screwed into the first screw hole, the connection screw hole and the second screw hole, the tail end of the heat-conducting screw rod 3 extends out of the second screw hole and is provided with a locknut 8, and the heat-conducting screw rod 3 penetrates through the heat exchange cavity and is in contact with the heat-conducting medium 7 in the heat exchange cavity;

the heat pump comprises a shell 2 and is characterized in that a positioning groove 9 and a mounting hole (not shown) matched with a heat conduction pipe 4 are formed in the shell 2, the mounting hole is communicated with a heat exchange cavity, the heat conduction pipe 4 is inserted into the mounting hole and penetrates through the heat exchange cavity, the heat conduction pipe 4 is in contact with a heat conduction medium 7 in the heat exchange cavity, the heat conduction pipe 4 is parallel to a heat conduction screw rod 3, an air pump body 10 is arranged in the positioning groove 9, the air pump body 10 is fixedly connected with the shell 2, one end of the heat conduction pipe 4 is inserted into an exhaust pipe of the air pump body 10, an exhaust pipe of the air pump body 10 is communicated with the outside, and the other end of the heat conduction pipe 4 is communicated with the outside.

The heat that first bearing 5 and second bearing 6 during operation produced can be equipped with simultaneously in the gas pump body 10 constantly transmits cold air to heat pipe 4 in can transmitting heat-conducting medium 7 in the heat transfer chamber through heat conduction screw rod 3 for the heat of heat-conducting medium 7 transmits the external world, makes wholly have better heat-sinking capability, can effectually avoid first bearing 5 and second bearing 6 overheated and lead to the expanded condition to appear.

In this embodiment, the thread 11 that the heat conduction screw rod 3 is located the heat transfer intracavity is provided with the cell body 12, the cell body 12 is linked together with the heat transfer chamber, through being provided with the cell body 12, cooperates a large amount of threads 11, can effectual promotion and heat-conducting medium 7 heat transfer area, promotes heat transfer efficiency.

In this embodiment, a nut body 13 is disposed at the head end of the heat-conducting screw 3, the heat-conducting screw 3 and the nut body 13 are integrally disposed, the end faces of the first bearing 5 and the second bearing 6 are respectively provided with a first counterbore (not shown) and a second counterbore (not shown), the first counterboring is communicated with the first screw hole, the second counterboring is communicated with the second screw hole, the first and second counterbores are internally provided with a potting layer 14, the potting layer 14 is fixedly connected with the heat conducting screw rod 3, the nut body 13 is provided with an injection hole 15, the injection hole 15 is communicated with the first reaming hole, and through the arrangement of the potting layer 14, can effectively improve the sealing performance, avoid the heat-conducting medium 7 from seeping out from the first screw hole and the second screw hole, meanwhile, the connection stability of the heat conduction screw rod 3 can be improved, so that the heat conduction screw rod 3 is not easy to loosen.

In this embodiment, be provided with heat conduction return bend 16 on casing 2, heat conduction return bend 16 one end and casing 2 fixed connection, heat conduction return bend 16 is linked together with heat pipe 4, the heat conduction return bend 16 other end is provided with duckbill valve 17, the air that duckbill valve 17 jetted out is configured to the inner circle of directional second bearing 6, and the compressed air that jets out from duckbill valve 17 can spout on the inner circle of second bearing 6 to play good radiating effect to second bearing 6.

In the present embodiment the inner ring of the second bearing 6 is provided with a mounting groove 18 where directed by the duckbill valve 17. The installation groove 18 is internally provided with foamed aluminum (not shown), the installation groove 18 and the foamed aluminum are both arranged in an annular shape, the foamed aluminum is bonded with the groove bottom of the installation groove 18, and the contact area between the foamed aluminum and compressed air can be increased by arranging the foamed aluminum, so that the heat transfer speed is increased.

In this embodiment, the heat pipe 4 intussuseption is filled with the heat conductor, the heat conductor includes first heat conduction net 19 and second heat conduction net 20, be provided with conducting wire 21 between first heat conduction net 19 and the second heat conduction net 20, conducting wire 21 both ends weld with first heat conduction net 19 and second heat conduction net 20 respectively, first heat conduction net 19 and second heat conduction net 20 form the sandwich structure through conducting wire 21, the tubular structure of sandwich structure batching and 4 clearance fit of heat pipe, first heat conduction net 19 wraps second heat conduction net 20 and sets up, through being provided with the heat conductor, can effectually promote holistic heat transfer area, promotes heat transfer efficiency, can form the turbulence in the heat pipe 4 simultaneously, can be favorable to promoting the stay time of air in heat pipe 4, promotes the heat transfer effect.

As shown in fig. 6, in the present embodiment, a heat conductive silicone layer (not shown) is disposed between the heat transfer tubes 4 and the first heat conductive mesh 19, and the ends of the first heat conductive mesh 19 are welded to the heat transfer tubes 4, so that the stability of the tubular structure after installation can be effectively improved by adopting the welded structure.

In some embodiments, the heat conducting screw 3 is of a hollow structure.

In some embodiments, the thermally conductive screw 3 is of a solid construction.

The working principle is as follows: when the machine tool spindle works, heat generated by the work of the first bearing and the second bearing can be transferred into the heat exchange cavity along the heat conducting screw rod, so that the heat dissipation capacity of the first bearing and the second bearing is improved, and the problem of accuracy reduction caused by overheating expansion is reduced.

The foregoing is illustrative of embodiments of the present invention, and the scope of the invention is not limited thereto, as any changes or substitutions that do not occur to the skilled artisan are intended to be covered by the scope of the invention, and no element, act, or instruction used herein should be construed as critical or essential unless explicitly described as such. In addition, as used herein, the articles "a" and "an" are intended to include one or more items, and may be used interchangeably with "one or more". Further, as used herein, the article "the" is intended to include the incorporation of one or more items referenced by the article "the" and may be used interchangeably with "one or more". Further, as used herein, the term "set" is intended to include one or more items, such as related items, unrelated items, combinations of related and unrelated items, and the like, and may be used interchangeably with "one or more". Where only one item is intended, the phrase "only one item" or similar language is used. In addition, as used herein, the term "having," variants thereof, and the like are intended to be open-ended terms. Further, the phrase "based on" is intended to mean "based, at least in part, on" unless explicitly stated otherwise. In addition, as used herein, the term "or" when used in series is intended to be inclusive and may be used interchangeably with "and/or" unless specifically stated otherwise, e.g., if used in conjunction with "or" only one of.