CN215890833U

CN215890833U - High-precision machine tool cooling device

Info

Publication number: CN215890833U
Application number: CN202121866548.6U
Authority: CN
Inventors: 李雪松; 刘海军; 刘宇宁; 张文地
Original assignee: Weihai Weimilling Precision Cnc Co ltd
Current assignee: Weihai Weimilling Precision Cnc Co ltd
Priority date: 2021-08-11
Filing date: 2021-08-11
Publication date: 2022-02-22
Anticipated expiration: 2031-08-11

Abstract

The utility model provides a high-precision machine tool cooling device which comprises a rotating shaft arranged on a box base, a bearing matched with the rotating shaft and a bearing end cover. An annular groove is formed on the box seat corresponding to the bearing position of the rotating shaft, a ring body is arranged in the annular groove, and the ring body is formed by splicing two half ring bodies. An annular cavity is formed in the ring body, and wall holes communicated with the annular cavity are formed in the wall body of the ring body at the two radial ends respectively. One wall hole on the ring body is connected with an air supply port of the pipeline fan, and the other wall hole is connected with an exhaust pipeline. This patent has improved the cooling condition of pivot bearing, can realize carrying out the purpose of cooling to the bearing under the running state high-efficiently, helps making the bearing keep moving under the best effective play state, and can guarantee the life-span of lathe bearing and the stability of pivot cutting better.

Description

High-precision machine tool cooling device

Technical Field

The utility model relates to the technical field of machine tools, in particular to a cooling structure of a machine tool rotating shaft.

Background

In order to ensure the service life of the machine tool spindle bearing and the spindle cutting stability performance, the bearing needs to be kept working in an optimal effective clearance state. The play refers to a gap between a rolling element of the bearing and the bearing inner ring and the bearing outer ring. The play is set in the bearing to ensure the bearing to run flexibly and smoothly, and the bearing needs to be close to the optimal effective play state to ensure the stable running state of the bearing, even if the number of rolling elements bearing the load is as large as possible. The effective play state of bearing load has great influence on the dynamic performance, rotation precision, service life, bearing capacity and the like of the bearing. The initial play obtained after assembly of the machine spindle is not the effective play of operation. The effective play in the operating state is formed when the engine enters a steady operating state under a certain load and after reaching a certain temperature rise value. The key to control the operating temperature of the bearing in the operating state is whether the bearing can be brought into the vicinity of the optimum operating play state.

Conventionally, in order to provide a machine tool spindle with stable cutting performance, spindle bearings are often operated while being maintained in the vicinity of an optimum effective play state. In order to enable the bearing to be in the vicinity of the optimal effective clearance state, the cooling and temperature control of the bearing are mostly realized by adopting a mode of cooling and controlling the temperature of the bearing. In a common rotating shaft bearing cooling device, a heat exchange medium mostly adopts cooling liquid (water cooling or oil cooling), and particularly, the cooling liquid is circulated or sprayed from the surface of a shaft housing of a rotating shaft to realize cooling. The cooling efficiency is low, and the local cooling of the bearing position is not obvious.

SUMMERY OF THE UTILITY MODEL

In order to improve the cooling condition of a rotating shaft bearing, the utility model provides a high-precision machine tool cooling device which can realize the purpose of efficiently cooling the bearing in a running state, is beneficial to keeping the bearing in an optimal effective clearance state to run, and can better ensure the service life of the machine tool bearing and the cutting stability of a rotating shaft.

The technical scheme is that the high-precision machine tool cooling device comprises a rotating shaft arranged on a box base, a bearing matched with the rotating shaft and a bearing end cover. An annular groove is formed in the position, corresponding to the bearing of the rotating shaft, of the box seat, a ring body is arranged in the annular groove, and the ring body is formed by splicing two half ring bodies. An annular cavity is formed in the ring body, and wall holes communicated with the annular cavity are formed in the wall body of the ring body at the two radial ends respectively. One wall hole on the ring body is connected with an air supply port of the pipeline fan, and the other wall hole is connected with an exhaust pipeline.

Furthermore, the ring body is arranged in the annular groove, and a pair of connecting blocks which are oppositely arranged at two radial ends are inserted into the radial outer side of the annular groove. The pair of connecting blocks can press the two half ring bodies of the ring body inwards along the radial direction, so that the inner ring surface of the ring body can be pressed on the annular bottom surface of the annular groove. And through holes which can be communicated with the wall holes on the same side are respectively arranged on the connecting blocks. The air supply port of the pipeline fan is connected to one of the outer ends of the through holes of the connecting blocks, and the exhaust pipeline is connected to the other of the outer ends of the through holes of the connecting blocks.

Furthermore, the end surfaces of the two ends of the connecting block are in contact with the end surfaces of the annular groove. The part of the connecting block inserted into the annular groove is arc-shaped plate-shaped, and a sealing gasket is embedded on the arc surface contacted with the outer annular surface of the ring body.

Furthermore, the lower end of the connecting block inserted into the annular groove forms an arc-shaped arm extending along the circumference to two ends, the inner arc surface of the arc-shaped arm is in contact with the outer ring surface of the ring body, and a sealing gasket is arranged between the contact surfaces.

Further, be equipped with communicating pipe in the through-hole of connecting block, the one end of this communicating pipe is connected on the wall hole with one side, and the other end extends to in the through-hole and the port department of this other end are equipped with the annular flange of radial outside extension. And a sealing ring is embedded on the side wall of the annular flange.

Further, a plurality of bottom grooves distributed at intervals are formed on the bottom surface of the annular groove. And an arc-shaped fin plate correspondingly matched with the bottom groove is formed on the inner ring surface of the ring body. When the ring body encloses the annular groove, the arc-shaped fin plate can be inserted into the bottom groove and is contacted with the groove wall of the bottom groove.

Furthermore, a plurality of elastic fins are distributed on the end faces of the two ends of the ring body at intervals along the radial direction, and the elastic fins are arc-shaped. After the ring body is inserted into the annular groove, the elastic fins can support the ring body, so that the ring body is fixed relative to the annular groove.

The utility model has the advantages that the cooling condition of the rotating shaft bearing is improved, the aim of efficiently cooling the bearing in the running state can be realized, the bearing is beneficial to keeping running in the optimal effective clearance state, and the service life of the machine tool bearing and the cutting stability of the rotating shaft can be better ensured.

Drawings

Fig. 1 is a schematic view of the overall mechanism of the present patent.

Fig. 2 is a schematic view of a partially enlarged structure of the present patent.

Fig. 3 is a schematic view of the assembled structure of the ring body in the radial section state in the patent.

The symbols in the drawings illustrate that: 10 case seats, 20 pivots, 30 bearings, 40 bearing end covers, 1 annular groove, 11 arc steps, 2 rings, 2a first semi-rings, 2b second semi-rings, 21 wall holes, 22 arc fins, 23 elastic fins, 3 connecting blocks, 31 through holes, 32 steps, 33 arc arms, 4 pipeline fans, 5 flange pipes, 6 communicating pipes, 7 kerfs and 8 sealing gaskets.

Detailed Description

The present invention will be further described with reference to the following examples.

Fig. 1-3 show a cooling device for a high-precision machine tool according to the present invention, which includes a rotating shaft 20 mounted on a housing 10, a bearing 30 matching with the rotating shaft 20, and a bearing cover 40.

An annular groove 1 is formed on the periphery of the position, corresponding to the rotating shaft 20, of the bearing 30, the box base 10 is matched with the rotating shaft 20, an annular body 2 is arranged in the annular groove 1, the annular body 2 is formed by splicing a first semi-annular body 2a and a second semi-annular body 2b, annular edges extending outwards in the radial direction are formed at the opposite end openings of the two semi-annular bodies, and bolts are arranged on the opposite annular edges to connect the two semi-annular bodies into a whole (see fig. 3).

An annular cavity is formed in the ring body 2, and wall holes 21 communicated with the annular cavity are formed in the wall body of the ring body 2 at two ends in the same radial direction respectively. One wall hole 21 on the ring body 2 is connected with an air supply port of the pipeline fan 4, and the other wall hole 21 is connected with an exhaust pipeline (the exhaust pipeline is connected on the pipe orifice of the flange pipe 5).

The ring body 2 is arranged in the annular groove 1, and the inner ring surface of the ring body 2 is in contact with the bottom surface of the annular groove to exchange heat. Therefore, the wall thickness between the outer ring of the bearing 30 and the inner ring surface of the ring body 2 should be thin, but the requirement of meeting the mechanical strength index is required.

A pair of connecting blocks 3, which are arranged opposite to each other at both radial ends, are inserted into the radial outer side of the annular groove 1, as shown in fig. 1 and 3. The pair of connecting blocks 3 can press the two half ring bodies of the ring body 2 inwards along the radial direction, so that the inner ring surface of the ring body 2 can be tightly pressed on the annular bottom surface of the annular groove 1, and the ring body 2 is connected with the box base 10 to form a firm matching structure.

The connecting blocks 3 are respectively provided with through holes 31 capable of communicating with the wall holes 21 on the same side (upper side or lower side in fig. 1). The air supply port of the pipeline fan 4 is connected with one of the outer ends of the through holes 31 of the connecting blocks 3, and the exhaust pipeline (specifically, the flange pipe 5) is connected with the other of the outer ends of the through holes 31 of the connecting blocks 3. As shown in fig. 1 and 3, a flange is formed at one end of the connecting block 3 connected with the pipeline fan 4.

As shown in fig. 3, end faces of both ends of the connecting block 3 are in contact with end faces of the annular groove 1, so that the connecting block 3 can axially support the annular groove 1 (i.e., the axial direction of the rotating shaft 20), and mechanical properties of the box base 10 weakened by the arrangement of the groove structure at the position are compensated to a certain extent. The part of the connecting block 3 inserted into the annular groove 1 is arc-shaped plate-shaped, and a sealing gasket 8 is embedded on the arc surface contacted with the outer annular surface of the ring body. Further, the lower end of the connecting block 3 inserted into the annular groove 1 forms an arc-shaped arm 33 extending along the circumferential direction, the inner arc surface of the arc-shaped arm 33 contacts with the outer annular surface of the ring body 2, and a sealing gasket 8 is arranged between the contact surfaces. The free ends of the two arc-shaped arms extend outwards along the arc direction, and the end surfaces of the two ends almost extend to form a semi-ring, so that the end surface of the connecting block 3 facing the ring body 2 can be fully contacted with the outer annular surface of the ring body 2

In the connecting block 3 with the structure, cold air sent by the pipeline fan 4 flows into the wall hole 21 through the through hole 31 and finally enters the annular cavity of the ring body 2 and is discharged from the other wall hole. Set up sealed 8 aims at preventing leaking gas between the opposite face of the two between connecting block and the ring body opposite face.

In the bearing cooling structure related to this patent, the pipeline fan sends into the cold air current that flows at a high speed and takes away the heat that the bearing distributed. This patent utilizes the pipeline fan to have the ability of sending into the air current of rapid flow, and the heat is taken away with the help of the air current of rapid flow fully, realizes carrying out the purpose of cooling to the bearing.

As shown in fig. 2 and 3, a communication pipe 6 is disposed in the through hole 31 of the connection block 3, one end of the communication pipe 6 is connected to the wall hole 21 on the same side, the other end extends into the through hole 31, and a port of the other end is provided with an annular flange extending radially outward. And a sealing ring is embedded on the side wall of the annular flange.

As shown in fig. 1 and 3, an arc step 11 is formed at the inner side of the outer port of the annular groove 1, and steps matched with the arc steps 11 at the same side are respectively formed on the side surfaces of both sides of the connecting block 3.

As shown in fig. 1 and 2, a plurality of bottom grooves 7 are formed on the bottom surface of the annular groove 1. An arc-shaped fin plate 22 correspondingly matched with the bottom groove 7 is formed on the inner ring surface of the ring body 2. When the ring body 2 is enclosed in the annular groove 1, the arc-shaped fin plate 22 can be inserted into the bottom groove 7 and is in contact with the wall of the bottom groove 7. The arrangement of the bottom groove 7 can ensure the mechanical strength of the peripheral wall thickness of the bearing on one hand, and can promote heat exchange on the other hand.

A plurality of elastic fins 23 are distributed on the end faces of the two ends of the ring body 2 at intervals along the radial direction, and the elastic fins 23 are arc-shaped. After the ring body 2 is inserted into the annular groove 1, the elastic fins 23 can support the ring body 2, so that the ring body 2 is firmly fixed relative to the annular groove 1.

The utility model improves the cooling condition of the rotating shaft bearing, can realize the purpose of efficiently cooling the bearing in the running state, is beneficial to keeping the bearing running in the optimal effective clearance state, and can better ensure the service life of the machine tool bearing and the cutting stability of the rotating shaft.

Under the scheme of this patent, heat transfer medium is the air, has energy-conserving, the advantage of environmental protection. The pipeline fan sends the air into the ring body and then can flow out of the ring body rapidly, and meanwhile, new cold air is rapidly supplemented into the ring body for heat exchange, so that the purpose of rapidly taking away heat emitted from the periphery of the bearing is achieved rapidly, and the bearing is cooled. The width (axial width) of the ring body is better larger than the width (axial width) of the bearing, so that heat can be transferred to the ring body from the peripheral box wall of the bearing more fully, and better heat exchange and cooling effects on the bearing are achieved.

In the embodiment of the patent, a temperature sensor may be disposed at the periphery of the bearing, and the rotation speed of the duct fan (i.e., the amount of cool air fed per unit time) may be controlled according to the sensing signal. In addition, an air station can be arranged at the air inlet end of the pipeline fan. The air is subjected to filtration, cooling, drying and other treatment or at least cooling treatment in the air station in advance, so that the heat exchange efficiency between the air and the ring body is improved.

As shown in fig. 3, the connecting block 3 has an arc-shaped plate structure and is fixed to the box base 10 by bolts/screws. In the concrete implementation mechanism, two connecting blocks 3 in the shape of an arc plate can be almost butted to form a ring, that is, each connecting block 3 is almost a semi-annular plate body, and only the connecting flange plate parts of the two semi-annular bodies are avoided. The flange formed on the connecting block 3 is positioned outside the annular groove 1.

However, the above description is only exemplary of the present invention, and the scope of the present invention should not be limited thereby, and the replacement of the equivalent components or the equivalent changes and modifications made according to the protection scope of the present invention should be covered by the claims of the present invention.

Claims

1. The utility model provides a high accuracy lathe cooling device, includes the pivot of installation on the case seat, with bearing and the bearing cap of pivot matching, its characterized in that: an annular groove is formed in the box seat corresponding to the bearing position of the rotating shaft, a ring body is arranged in the annular groove, and the ring body is formed by splicing two half ring bodies; an annular cavity is formed in the ring body, and wall holes communicated with the annular cavity are formed in the wall body of the ring body at the two radial ends respectively; one wall hole on the ring body is connected with an air supply port of the pipeline fan, and the other wall hole is connected with an exhaust pipeline.

2. A high-precision machine tool cooling device according to claim 1, characterized in that: the ring body is arranged in the annular groove, and a pair of connecting blocks which are oppositely arranged at two radial ends are inserted in the radial outer side of the annular groove; the pair of connecting blocks can press the two half ring bodies of the ring body inwards along the radial direction, so that the inner ring surface of the ring body can be pressed on the annular bottom surface of the annular groove; through holes which can be communicated with the wall holes on the same side are respectively arranged on the connecting blocks; the air supply port of the pipeline fan is connected to one of the outer ends of the through holes of the connecting blocks, and the exhaust pipeline is connected to the other of the outer ends of the through holes of the connecting blocks.

3. A high-precision machine tool cooling device according to claim 2, characterized in that: the end surfaces of two ends of the connecting block are in contact with the end surfaces of two ends of the annular groove; the part of the connecting block inserted into the annular groove is arc-shaped plate-shaped, and a sealing gasket is embedded on the arc surface contacted with the outer annular surface of the ring body.

4. A high-precision machine tool cooling device according to claim 3, characterized in that: the lower end of the connecting block inserted into the annular groove forms an arc-shaped arm extending along the circumferential direction to two ends, the inner arc surface of the arc-shaped arm is in contact with the outer ring surface of the ring body, and a sealing gasket is arranged between the contact surfaces.

5. A high-precision machine tool cooling device according to claim 2, characterized in that: the connecting block is characterized in that a communicating pipe is arranged in the through hole of the connecting block, one end of the communicating pipe is connected to the wall hole on the same side, the other end of the communicating pipe extends into the through hole, an annular flange extending outwards in the radial direction is arranged at the port of the other end of the communicating pipe, and a sealing ring is embedded on the side wall of the annular flange.

6. A high-precision machine tool cooling device according to claim 1, characterized in that: a plurality of bottom grooves distributed at intervals are formed on the bottom surface of the annular groove; an arc-shaped fin plate correspondingly matched with the bottom groove is formed on the inner ring surface of the ring body; when the ring body encloses the annular groove, the arc-shaped fin plate can be inserted into the bottom groove and is contacted with the groove wall of the bottom groove.

7. A high accuracy machine tool cooling device according to claim 6, characterized in that: a plurality of elastic fins are distributed on the end faces of the two ends of the ring body at intervals along the radial direction, and the elastic fins are arc-shaped; after the ring body is inserted into the annular groove, the elastic fins can support the ring body, so that the ring body is fixed relative to the annular groove.

8. A high-precision machine tool cooling device according to claim 1, characterized in that: a plurality of elastic fins are distributed on the end faces of the two ends of the ring body at intervals along the radial direction, and the elastic fins are arc-shaped; after the ring body is inserted into the annular groove, the elastic fins can support the ring body, so that the ring body is fixed relative to the annular groove.