CN113915337B - Spindle assembly with air sealing structure and machine tool with spindle assembly - Google Patents

Spindle assembly with air sealing structure and machine tool with spindle assembly Download PDF

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Publication number
CN113915337B
CN113915337B CN202111275801.5A CN202111275801A CN113915337B CN 113915337 B CN113915337 B CN 113915337B CN 202111275801 A CN202111275801 A CN 202111275801A CN 113915337 B CN113915337 B CN 113915337B
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China
Prior art keywords
flange
hole
channel
annular
inner diameter
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CN202111275801.5A
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CN113915337A (en
Inventor
王攀
耿继青
邵启鹏
何圳涛
高威
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/40—Sealings between relatively-moving surfaces by means of fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/70—Stationary or movable members for carrying working-spindles for attachment of tools or work
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/44—Free-space packings
    • F16J15/447—Labyrinth packings

Abstract

The invention provides a main shaft assembly with an air sealing structure and a machine tool with the same, wherein the main shaft assembly comprises a main shaft, a bearing seat, a flange and a dynamic balance disc; a flange mounting hole is formed on the flange, an annular boss of the dynamic balance disc is inserted between the flange mounting hole and the main shaft, and a ring-shaped element is embedded between the annular boss and the flange mounting hole; a first channel is formed between the annular piece and the flange mounting hole; an annular cavity is formed at the communication position of the first channel and the flange through hole; after the gas enters the first channel, the gas is exhausted uniformly and continuously, the exhaust path is shortened, and the gas sealing effect is improved; the annular piece is formed with a plurality of teeth, forms the channel between the adjacent tooth, forms the subchannel between channel and the mounting hole, and a plurality of subchannels constitute first passageway, form the second passageway between the tip of flange and the dynamic balance dish, and the gas of being discharged by first passageway gets into the second passageway, can clear away the pollutant such as cutting fluid and iron fillings that get into the second passageway to the whole circumferencial direction of sealed bearing.

Description

Spindle assembly with air sealing structure and machine tool with spindle assembly
Technical Field
The invention relates to the technical field of intelligent equipment, in particular to a spindle assembly with an air sealing structure and a machine tool with the spindle assembly.
Background
In the field of numerical control machines, an electric spindle is a technology for integrating a spindle with a spindle motor, belongs to the high-precision technical industry, is mainly used for processing parts, and is mainly used for spraying cutting fluid in the processing process and generating pollutants such as scrap iron and the like. When the electric spindle is applied to high rotating speed and complex environment, the shaft center of the electric spindle and the bearing do not allow dirt to enter, otherwise, the service life of the bearing is reduced. In the existing spindle gas sealing structure, gas enters an annular cavity through a radial hole and an annular groove, and the gas has large pressure loss along the way, uneven gas pressure distribution and slow gas flow rate, so that the gas sealing coverage is narrow and the effect is poor.
Disclosure of Invention
In view of the above, the invention provides a spindle assembly with a gas sealing structure and a machine tool with the spindle assembly, so as to solve the problems of large gas on-way pressure loss, uneven gas pressure distribution, narrow gas sealing coverage, poor effect and the like in the prior art.
The invention provides a main shaft assembly with an air sealing structure, which comprises a main shaft, a bearing seat, a bearing, a flange and a dynamic balance disc, wherein the bearing seat, the bearing, the flange and the dynamic balance disc are sequentially arranged along the axial direction of the main shaft; the bearing is arranged between the main shaft and the bearing seat; a flange mounting hole is formed in the center of the flange, an annular boss is formed at one end of the dynamic balance disc facing the flange, the annular boss is inserted into an annular space between the flange mounting hole and the main shaft, an annular gap is formed between the outer peripheral surface of the annular boss and the inner peripheral surface of the flange mounting hole, a ring-shaped piece is embedded in the annular gap, and a first channel is formed between the outer peripheral surface of the ring-shaped piece and the inner peripheral surface of the flange mounting hole;
a bearing seat through hole is formed in the bearing seat, a flange through hole is formed in the flange, one end of the flange through hole is communicated with the bearing seat through hole, and the other end of the flange through hole is communicated with the flange mounting hole;
an annular cavity is formed at the communication position of the first channel and the flange through hole, the annular cavity is communicated with the air inlet end of the first channel, and the air outlet end of the first channel is communicated with the outside.
Further optionally, a flow area of an air outlet end of the annular cavity is larger than a flow area of an air inlet end of the first channel.
Further optionally, the flange forms an annular groove structure at an end of the flange through hole communicating with the first channel, the annular groove structure constituting the annular cavity.
Further optionally, the outer circumferential surface of the ring-shaped member is formed with a plurality of teeth extending in parallel, a channel is formed between every two adjacent teeth, a sub-channel is formed between each channel and the inner circumferential surface of the flange mounting hole, and the plurality of sub-channels form the first channel.
Further optionally, a plurality of the teeth extend in an axial or radial direction of the ring.
Further optionally, the plurality of teeth are evenly distributed along a circumferential direction of the ring.
Further optionally, an annular groove with an opening facing the flange is formed at the end of the dynamic balance disc, the end of the flange far away from the bearing seat and the air outlet end of the annular member are inserted into the annular groove, and an annular second channel is formed between the end of the flange far away from the bearing seat and the wall surface of the annular groove; the air inlet end of the second channel is communicated with the air outlet end of the first channel, and the air outlet end of the second channel is communicated with the outside; the bearing seat through hole, the flange through hole, the annular cavity, the first channel and the second channel form a first gas flow path, and gas is exhausted to the outside through the first gas flow path.
Further optionally, the flange mounting hole is an unequal-diameter hole, and includes a first inner-diameter hole, a second inner-diameter hole, and a third inner-diameter hole, the third inner-diameter hole is formed on a side of the flange close to the bearing, the first inner-diameter hole is formed on a side of the flange close to the dynamic balance disc, the second inner-diameter hole is formed between the first inner-diameter hole and the third inner-diameter hole, a diameter of the third inner-diameter hole is larger than a diameter of the first inner-diameter hole, and a diameter of the first inner-diameter hole is larger than a diameter of the second inner-diameter hole;
the flange is provided with a groove between the third inner diameter hole and the second inner diameter hole; and a spacer ring is arranged between the main shaft and the flange, one end of the spacer ring is inserted into the groove, and the other end of the spacer ring is inserted into a gap between the second inner diameter hole and the main shaft, so that a labyrinth structure is formed between the flange and the spacer ring.
Further optionally, a third channel is formed between the annular member and the dynamic balance disc, and a fourth channel is formed between the spacer ring and the second inner diameter hole;
the bearing seat through hole, the flange through hole, the annular cavity, the first channel, the third channel, the fourth channel and the labyrinth structure form a second gas flow path;
the length of the first gas flow path is less than the length of the second gas flow path.
Further optionally, the flange through hole is formed with a necking structure extending from an air inlet end of the flange through hole to an air outlet end of the flange through hole.
The invention also provides a machine tool which is provided with the spindle assembly with the air sealing structure.
The invention provides a main shaft assembly with an air sealing structure, which comprises a main shaft, a bearing seat, a flange and a dynamic balance disc, wherein the main shaft is provided with an air sealing structure; a bearing is arranged between the main shaft and the bearing seat; the flange is provided with a flange mounting hole, the dynamic balance disc forms an annular boss, the annular boss is inserted into an annular space between the flange mounting hole and the main shaft, an annular gap is formed between the outer peripheral surface of the annular boss and the inner peripheral surface of the flange mounting hole, and an annular piece is embedded in the annular gap; a first channel is formed between the annular piece and the flange mounting hole; a bearing seat through hole and a flange through hole are formed in the bearing seat and the flange respectively, and an annular cavity is formed at the communication position of the first channel and the flange through hole; the annular cavity is communicated with the air inlet end of the first channel, and the air outlet end of the first channel is communicated with the outside; the gas can be stored after entering the first channel, so that the gas is exhausted uniformly and continuously, the gas sealing coverage surface is increased, the exhaust path is shortened, the gas on-way pressure loss is reduced, the gas sealing is more thorough, and the gas sealing effect is improved; the ring-shaped member is formed with a plurality of teeth, form the channel between the adjacent tooth, form the subchannel between channel and the mounting hole, a plurality of subchannels constitute first passageway, gaseous gets into first passageway by the annular chamber, flow area reduces, atmospheric pressure is even, the velocity of flow increases, form the second passageway between the tip of flange and the dynamic balance dish, get into the second passageway and form the high pressure district by the gaseous entering of first passageway combustion gas, can clear away pollutants such as cutting fluid and iron fillings that get into the second passageway, the whole circumferencial direction of sealable bearing.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a schematic structural view of an embodiment of a spindle hermetic seal assembly provided in the present invention;
FIG. 2 is a schematic structural view of an embodiment of a ring-shaped member provided by the present invention;
FIG. 3 is a schematic structural view of an embodiment of a flange according to the present invention;
in the figure:
11-a main shaft; 12-a bearing seat; 121-bearing seat through hole; 13-a flange; 131-a first flange through hole; 132-a second flange through hole; 133-a first inner diameter bore; 134-a second inner diameter bore; 135-ring cavity; 14-a dynamic balancing disk; 15-a bearing; 16-an annular member; 171-a first channel; 172-a second channel; 173-third channel; 174-a fourth channel; 18-spacer ring; 19-labyrinth structure.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "the plural" typically includes at least two, but does not exclude the presence of at least one.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter associated objects are in an "or" relationship.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
In the existing numerical control machine tool, a spindle gas sealing structure mainly seals a spindle in a mode that gas enters an annular cavity through a radial hole and an annular groove, the exhaust path is long, and the gas has large pressure loss along the path, uneven gas pressure distribution, slow gas flow rate and discontinuous exhaust, so that the gas sealing coverage is narrow and the effect is poor. The invention creatively provides a main shaft assembly with an air sealing structure, which comprises a main shaft, a bearing seat, a flange and a dynamic balance disc, wherein the main shaft is provided with a sealing structure; a bearing is arranged between the main shaft and the bearing seat; the flange is provided with a flange mounting hole, the annular boss of the dynamic balance disc is inserted into an annular space between the flange mounting hole and the main shaft, and an annular part is embedded between the outer peripheral surface of the annular boss and the inner peripheral surface of the flange mounting hole; a first channel is formed between the outer peripheral surface of the annular piece and the inner peripheral surface of the flange mounting hole; an annular cavity is formed at the communication position of the first channel and the flange through hole, and external gas enters the first channel through the bearing seat through hole, the flange through hole and the annular cavity and is then discharged to the outside; after the gas enters the first channel, the gas is exhausted uniformly and continuously, the gas sealing coverage surface is increased, the exhaust path is shortened, the gas on-way pressure loss is reduced, the gas sealing is more thorough, and the gas sealing effect is improved.
As shown in fig. 1, 2 and 3, the present embodiment provides a spindle assembly provided with an airtight structure, the spindle assembly including a spindle 11, a bearing housing 12 sequentially arranged along an axial direction of the spindle 11, a flange 13 connected to the bearing housing 12, and a dynamic balance disc 14 connected to an end of the spindle 11; the bearing seat 12 and the flange 13 are fixedly connected together along the axial direction of the main shaft 11, and the dynamic balance disc 14 is fixedly connected together with the main shaft 11; a bearing 15 is arranged between the main shaft 11 and the bearing seat 12; a flange mounting hole is formed in the center of the flange 13, an annular boss is formed at one end of the dynamic balance disc 14 facing the flange 13, the annular boss is inserted into an annular space between the flange mounting hole and the main shaft 11, an annular gap is formed between the outer peripheral surface of the annular boss and the inner peripheral surface of the flange mounting hole, and an annular piece 16 is embedded in the annular gap; specifically, the bearing seat 12 is a fixed part, the main shaft 11 is a rotating part, the main shaft 11 is sleeved at the shaft hole of the bearing seat 12, the flange 13 is fixed on the bearing seat 12 through a screw, and the dynamic balance disc 14 is fixed at the end part of the main shaft 11 through a screw and can apply pre-tightening force to the bearing 15; the bearing inner ring is in interference fit with the main shaft 11, and the bearing outer ring is fixedly connected with the bearing seat 12;
a first passage 171 is formed between the outer peripheral surface of the ring member 16 and the inner peripheral surface of the flange mounting hole; a bearing seat through hole 121 is formed in the bearing seat 12, a flange through hole is formed in the flange 13, one end of the flange through hole is communicated with the bearing seat through hole 121, and the other end of the flange through hole is communicated with the flange mounting hole; an annular cavity 135 is formed at the communication position of the first channel 171 and the flange through hole, the annular cavity 135 is communicated with the air inlet end of the first channel 171, and the air outlet end of the first channel 171 is communicated with the outside; specifically, the bearing housing through-hole 121 is along the axial direction of the main shaft 11, and the flange through-hole includes a first flange through-hole 131 along the axial direction of the main shaft 11 and a second flange through-hole 132 along the radial direction of the main shaft 11; one end of the first flange through hole 131 is communicated with the bearing seat through hole 121, and the other end of the first flange through hole 131 is communicated with the annular cavity 135; the flange through hole is provided with a necking structure extending from the air inlet end of the flange through hole to the air outlet end of the flange through hole, and the air pressure is increased when the gas flows through the necking structure;
the external gas enters the annular cavity 135 through the bearing seat through hole 121 and the flange through hole and is discharged to the outside through the first channel 171;
in conclusion, the gas can be stored after entering the first passage 171, so that the gas exhaust is uniform and continuous, the gas sealing coverage is increased, the gas exhaust path is shortened, the gas on-way pressure loss is reduced, the gas sealing is more thorough, and the gas sealing effect is improved.
Further, the flange 13 forms an annular groove structure at the end of the flange through hole communicating with the first passage 171, the annular groove structure constituting an annular chamber.
A plurality of teeth extending in parallel are formed on the outer peripheral side of the annular member 16, a channel is formed between every two adjacent teeth, a sub-passage is formed between each channel and the inner peripheral surface of the flange mounting hole, a plurality of sub-passages are formed between the plurality of channels and the inner peripheral surface of the flange mounting hole, and the plurality of sub-passages form a first passage 171;
further, the teeth extend in the axial or radial direction of the ring 16.
Preferably, the plurality of teeth is evenly distributed along the circumference of the annular element 16; the gas can be uniformly distributed at the end part of the annular part 16 far away from the second inner diameter hole 134 after passing through the first channel 171, so that the exhaust is uniform and continuous, the coverage surface and the effect of gas sealing are improved, and the gas sealing is more thorough; the annular member 16 is a fine-toothed copper ring;
the outer periphery side of the annular piece 16 is in interference fit with the first inner diameter hole 133, the flow area of the gas outlet end of the annular cavity 135 is larger than that of the gas inlet end of the first channel 171, when gas enters the first channel 171 from the annular cavity 135, the flow rate is increased, the gas is continuously discharged, and the gas pressure is uniform;
in some embodiments, the end of the dynamic balance disc 14 forms an annular groove opening towards the flange 13, the end of the flange 13 far away from the bearing seat 12 and the air outlet end of the annular member 16 are inserted into the annular groove, and an annular second channel 172 is formed between the end of the flange 13 far away from the bearing seat 12 and the wall surface of the annular groove; the air inlet end of the second channel 172 is communicated with the air outlet end of the first channel 171, and the air outlet end of the second channel 172 is communicated with the outside;
preferably, the exhaust end of the second channel 172 is towards the flange 13 and away from the end of the main shaft 11; the gas is discharged from the second channel 172 and then leaves the front end of the main shaft 11, so that the pollution to parts in processing is avoided;
the bearing seat through hole 121, the flange through hole, the annular cavity 135, the first passage 171 and the second passage 172 form a first gas flow path through which gas is discharged to the outside; compared with the length of the gas flow path in the prior art, the length of the first gas flow path is shorter, the on-way pressure loss is reduced, the gas pressure distribution is more uniform, the coverage area of the gas seal is larger, and the reliability of the gas seal is improved; the gas enters the second channel 172 and forms a high pressure area, so that pollutants such as cutting fluid, scrap iron and the like entering the second channel 172 can be removed, and the whole circumferential direction of the bearing can be sealed; the bearing can be effectively protected, and the service life of the bearing is prolonged;
the problem of most main shaft gas seal structure, radial gas pocket adds annular grooving structure, and the ring channel is on one side through the clearance connection external, on the other side through inside the clearance connection main shaft, all can cause the gas pressure intensity to weaken (the pressure release), and the atmospheric pressure of whole ring channel is inhomogeneous, and the velocity of flow is inhomogeneous, finally reaches ring channel gas few again that radial gas pocket is opposite, can not carry out effectual gas seal protection to the whole circumferencial direction of bearing.
Further, the flange mounting holes are non-uniform diameter holes, and include a first inner diameter hole 133, a second inner diameter hole 134 and a third inner diameter hole; the first inner diameter hole 133 forms an annular cavity 135 at an end near the second inner diameter hole 134; a first passage 171 is formed between the inner peripheral surface of the first inner diameter hole 133 and the outer peripheral surface of the ring member 16; the end of the annular member 16 is sealed against the first bore hole 133 at the end adjacent the second bore hole 134 so that gas entering the annular cavity 135 can enter the first passage 171 directly; a third inner diameter hole is formed on one side of the flange 13 close to the bearing 15, a first inner diameter hole is formed on one side of the flange 13 close to the dynamic balance disc 14, a second inner diameter hole 134 is formed between the first inner diameter hole 133 and the third inner diameter hole, the diameter of the third inner diameter hole is larger than that of the first inner diameter hole 133, and the diameter of the first inner diameter hole 133 is larger than that of the second inner diameter hole 134;
the flange has a groove formed between the third inner diameter hole and the second inner diameter hole 134; a spacer ring 18 is arranged between the main shaft 11 and the flange 13, one end of the spacer ring 18 is inserted into the groove, and the other end of the spacer ring 18 is inserted into a gap between the second inner diameter hole 134 and the main shaft 11, so that a labyrinth structure is formed between the flange 13 and the spacer ring 18; the dynamic balance disc 14 can press the spacer ring 18 to apply pretightening force to the bearing 15;
preferably, a third channel 173 is formed between the annular member 16 and the dynamic balance disc 14, and a fourth channel 174 is formed between the spacer ring 18 and the second inner diameter hole 134; the labyrinth 19 forms a labyrinth seal, the third passage 173 and the fourth passage 174 form a gap seal,
the bearing seat through hole, the flange through hole, the annular cavity, the first channel 171, the third channel 172, the fourth channel 174 and the labyrinth structure form a second gas flow path;
the length of the first gas flow path is less than the length of the second gas flow path; because the on-way resistance of the third channel and the fourth channel is greater than that of the second channel, the gas is smoothly and continuously discharged through the first gas flow path, and a compact sealing effect is formed;
when the bearing is lubricated by grease, gas cannot enter the area where the bearing is located through the second gas flow path to blow away the grease, and secondary pollution to the bearing lubricated by the grease cannot be caused; the gas can be discharged to the outside directly, and does not flow to the bearing, thereby causing interference and secondary pollution to the bearing lubrication;
when the bearing is lubricated by oil gas, the area where the bearing is located has positive pressure, oil gas is filled in the labyrinth structure, the third channel 173 and the fourth channel 174, and therefore gas-tight seal gas can be prevented from entering the area where the bearing is located, the gas is prevented from influencing the air pressure of oil gas lubrication, and the oil gas lubrication effect of the bearing is optimal.
In a word, the bearing inner ring and the main shaft are in interference fit, the spacer ring is abutted against the bearing inner ring, and the dynamic balance disc is fixed at the end part of the main shaft, so that the bearing inner ring, the main shaft, the spacer ring and the dynamic balance disc realize synchronous rotation;
the bearing outer ring is abutted to the bearing seat, the outer peripheral side of the annular piece is in interference fit with the flange, and the bearing seat, the bearing outer ring, the flange and the annular piece are all static.
The embodiment also provides a machine tool, which is provided with the spindle assembly with the air sealing structure.
Exemplary embodiments of the present disclosure are specifically illustrated and described above. It is to be understood that the present disclosure is not limited to the precise arrangements, instrumentalities, or instrumentalities described herein; on the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims (11)

1. A main shaft assembly with an air sealing structure is characterized by comprising a main shaft, a bearing seat, a bearing, a flange and a dynamic balance disc, wherein the bearing seat, the bearing, the flange and the dynamic balance disc are sequentially arranged along the axial direction of the main shaft; the bearing is arranged between the main shaft and the bearing seat; a flange mounting hole is formed in the center of the flange, an annular boss is formed at one end of the dynamic balance disc facing the flange, the annular boss is inserted into an annular space between the flange mounting hole and the main shaft, an annular gap is formed between the outer peripheral surface of the annular boss and the inner peripheral surface of the flange mounting hole, a ring-shaped piece is embedded in the annular gap, and a first channel is formed between the outer peripheral surface of the ring-shaped piece and the inner peripheral surface of the flange mounting hole;
a bearing seat through hole is formed in the bearing seat, a flange through hole is formed in the flange, one end of the flange through hole is communicated with the bearing seat through hole, and the other end of the flange through hole is communicated with the flange mounting hole;
an annular cavity is formed at the communication position of the first channel and the flange through hole, the annular cavity is communicated with the air inlet end of the first channel, and the air outlet end of the first channel is communicated with the outside.
2. The spindle assembly with the hermetic sealing structure according to claim 1, wherein a flow area of an outlet end of the annular cavity is larger than a flow area of an inlet end of the first passage.
3. The spindle assembly provided with the airtight structure, according to claim 2, wherein said flange forms an annular recessed groove structure at an end of said flange through hole communicating with said first passage, said annular recessed groove structure constituting said annular chamber.
4. The spindle assembly provided with the airtight structure, according to any one of claims 1 to 3, wherein the outer circumferential surface of said annular member is formed with a plurality of teeth extending in parallel, a channel is formed between each adjacent two of said teeth, a sub-passage is formed between each of said channels and the inner circumferential surface of said flange mounting hole, and a plurality of said sub-passages constitute said first passage.
5. The spindle assembly provided with the airtight structure, according to claim 4, wherein a plurality of said teeth extend in an axial direction or a radial direction of said ring-shaped member.
6. The spindle assembly provided with the airtight structure, according to claim 5, wherein a plurality of said teeth are uniformly distributed along a circumferential direction of said ring-shaped member.
7. The spindle assembly with the airtight structure is provided with the airtight structure, according to any one of claims 1 to 6, wherein an annular groove with an opening facing the flange is formed at the end of the dynamic balance disc, the end of the flange far away from the bearing seat and the air outlet end of the annular member are inserted into the annular groove, and an annular second passage is formed between the end of the flange far away from the bearing seat and the wall surface of the annular groove; the air inlet end of the second channel is communicated with the air outlet end of the first channel, and the air outlet end of the second channel is communicated with the outside; the bearing seat through hole, the flange through hole, the annular cavity, the first channel and the second channel form a first gas flow path, and gas is exhausted to the outside through the first gas flow path.
8. The spindle assembly with the hermetic seal structure according to claim 7, wherein the flange mounting hole is an unequal diameter hole including a first inner diameter hole, a second inner diameter hole, and a third inner diameter hole, the third inner diameter hole is formed at a side of the flange close to the bearing, the first inner diameter hole is formed at a side of the flange close to the dynamic balance disk, the second inner diameter hole is formed between the first inner diameter hole and the third inner diameter hole, the third inner diameter hole has a larger diameter than the first inner diameter hole, and the first inner diameter hole has a larger diameter than the second inner diameter hole;
the flange is provided with a groove between the third inner diameter hole and the second inner diameter hole; and a spacer ring is arranged between the main shaft and the flange, one end of the spacer ring is inserted into the groove, and the other end of the spacer ring is inserted into a gap between the second inner diameter hole and the main shaft, so that a labyrinth structure is formed between the flange and the spacer ring.
9. The spindle assembly with the airtight structure, according to claim 8, wherein a third channel is formed between the annular member and the dynamic balance disc, and a fourth channel is formed between the spacer ring and the second inner diameter hole;
the bearing seat through hole, the flange through hole, the annular cavity, the first channel, the third channel, the fourth channel and the labyrinth structure form a second gas flow path;
the length of the first gas flow path is less than the length of the second gas flow path.
10. The spindle assembly provided with the hermetic sealing structure according to claim 9, wherein the flange through hole is formed with a constriction extending from an air inlet end of the flange through hole to an air outlet end of the flange through hole.
11. A machine tool provided with a spindle assembly provided with a gas sealing structure according to any one of claims 1 to 10.
CN202111275801.5A 2021-10-29 2021-10-29 Spindle assembly with air sealing structure and machine tool with spindle assembly Active CN113915337B (en)

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CN202111275801.5A CN113915337B (en) 2021-10-29 2021-10-29 Spindle assembly with air sealing structure and machine tool with spindle assembly

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08132137A (en) * 1994-11-11 1996-05-28 Ntn Corp Roll
EP1075894A2 (en) * 1999-08-06 2001-02-14 Hardinge, Inc. Driving connection arrangement and sealing arrangement for a live tool and method for sealing the same
CN105983710A (en) * 2015-03-16 2016-10-05 株式会社捷太格特 A main shaft device
CN110026787A (en) * 2019-05-22 2019-07-19 宝鸡忠诚机床股份有限公司 A kind of sealing of machine tool chief axis and pollution discharge structure
CN112049866A (en) * 2020-08-28 2020-12-08 珠海格力电器股份有限公司 Bearing seat and electric spindle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08132137A (en) * 1994-11-11 1996-05-28 Ntn Corp Roll
EP1075894A2 (en) * 1999-08-06 2001-02-14 Hardinge, Inc. Driving connection arrangement and sealing arrangement for a live tool and method for sealing the same
CN105983710A (en) * 2015-03-16 2016-10-05 株式会社捷太格特 A main shaft device
CN110026787A (en) * 2019-05-22 2019-07-19 宝鸡忠诚机床股份有限公司 A kind of sealing of machine tool chief axis and pollution discharge structure
CN112049866A (en) * 2020-08-28 2020-12-08 珠海格力电器股份有限公司 Bearing seat and electric spindle

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