CN217539620U

CN217539620U - Air sealing structure, brake structure and high-speed turntable

Info

Publication number: CN217539620U
Application number: CN202221380635.5U
Authority: CN
Inventors: 区世权; 何生威
Original assignee: Foshan Demate Intelligent Equipment Technology Co ltd
Current assignee: Foshan Demate Intelligent Equipment Technology Co ltd
Priority date: 2022-06-02
Filing date: 2022-06-02
Publication date: 2022-10-04
Anticipated expiration: 2032-06-02

Abstract

The high-speed rotary table comprises a gas sealing structure, a brake structure and a high-speed rotary table, and is characterized in that the gas sealing structure comprises a rotary table cover body, and a first air duct is formed in the rotary table cover body; the labyrinth seal assembly is arranged on the rotary table cover body; the labyrinth seal assembly has a first gas-dividing groove; the compressed gas in the first air passage uniformly flows out of the labyrinth seal assembly through the first air distribution groove to form an air seal. The utility model discloses a seal structure is non-contact dynamic seal, realizes giving vent to anger through dividing the gas tank evenly and prevent through labyrinth seal structure that the particulate matter from getting into inside the motor. The brake structure is characterized in that hydraulic oil with certain pressure is injected, the rotating shaft of the shape-changing rotary table is arranged in the middle of the brake sheet, the clamping function is realized, the brake structure is compact in whole, the brake torque is large, larger tool fixing can be realized, and the brake structure with different sizes can be designed according to the application diameter.

Description

Air sealing structure, brake structure and high-speed turntable

Technical Field

The utility model belongs to the technical field of the revolving stage, concretely relates to airtight structure, brake structure and high-speed revolving stage.

Background

The part of the rotating shaft of the five-axis turntable for the mechanical processing machine tool is directly provided with and fixed with a workpiece and can contact with cutting fluid or cutting chips in the cutting operation process, so that the connection of the rotating end of the turntable and the shell is easy to feed water, the cutting chips and dust, and the service life is short. It is therefore desirable to provide a high speed turntable air seal structure that addresses the above-identified problems.

However, when the existing rotary table is used, the gas paths of the gas sealing structure are unreasonably distributed, so that gas is easily discharged unevenly, certain points are possibly weak, sealing risks are caused, and internal water inflow is caused.

SUMMERY OF THE UTILITY MODEL

In order to overcome prior art not enough, the utility model provides a gas seal structure, brake structure and high-speed revolving stage to solve prior art's high-speed revolving stage when using, gas seal structure's gas circuit distribution is unreasonable, leads to giving vent to anger inhomogeneously easily, probably causes some point to be weaker, and is sealed to have the risk of inefficacy, leads to the problem of inside intaking.

The utility model provides an one of them embodiment provides an airtight structure, include:

the rotary table cover body is internally provided with a first air duct; and

the labyrinth seal assembly is arranged on the rotary table cover body; the labyrinth seal assembly is provided with a first air distribution groove, and the first air distribution groove is communicated with the first air passage;

wherein the compressed gas in the first air passage uniformly flows out of the labyrinth seal assembly through the first air distribution groove to form an air-tight seal.

In one embodiment, the labyrinth seal assembly includes:

the first sealing ring is arranged on the rotary table cover body; the first sealing ring is provided with a first gas distribution groove;

a second seal ring disposed inside the first seal ring, the second seal ring being rotatable relative to the first seal ring; and a gap formed between the first sealing ring and the second sealing ring is an air-tight flow passage.

In one embodiment, the first gas distribution groove is arranged on the bottom surface of the first sealing ring, and is an annular groove; the bottom surface of the first air distribution groove is provided with a plurality of air distribution channels, the air distribution channels penetrate through the side wall of the first sealing ring to the inner wall surface of the first sealing ring, and the air distribution channels are uniformly distributed along the circumferential direction of the first sealing ring and used for enabling compressed air to uniformly flow into the air sealing flow channel.

In one embodiment, the first sealing ring is internally provided with an inwardly extending annular baffle plate which is positioned above the second sealing ring, the bottom surface of the annular baffle plate is provided with an annular convex block protruding downwards, the top surface of the second sealing ring is provided with an annular concave position corresponding to the annular convex block, the depth of the annular concave position is greater than the length of the annular convex block, and the annular concave position is used for accommodating the debris particles which cannot be blown out of the gas sealing flow passage by the compressed gas;

and/or the outer wall of the second sealing ring is provided with a second gas distribution groove.

In one embodiment, the turntable cover body is provided with a receiving notch for receiving and mounting the first sealing ring; the bottom surface of the accommodating notch is provided with a first mounting ring groove and a second mounting ring groove which are coaxial, and an air outlet of the first air duct is positioned between the first mounting ring groove and the second mounting ring groove; and first sealing rings are arranged in the first mounting ring groove and the second mounting ring groove.

Also indicated in one of the embodiments is a brake structure comprising:

a turntable housing having a first oil injection passage;

the rotary table cover body is arranged at the top of the rotary table shell and provided with a second oil injection channel, an oil distribution groove is formed in the inner wall surface of the rotary table cover body, and the oil distribution groove is communicated with the second oil injection channel;

the braking part is arranged at the bottom of the turntable cover body and provided with a braking sheet, and the braking sheet is attached to the inner wall surface of the turntable cover body;

wherein the turntable housing is provided with a hermetic sealing structure as described in any one of the embodiments.

In one embodiment, the first oil injection passage is an L-shaped oil injection passage, and a vertical portion of the first oil injection passage communicates with the second oil injection passage; and an oil outlet of the horizontal part of the second oil injection passage is communicated with the oil distribution groove.

In one embodiment, the oil distribution groove is provided with mounting grooves in the upper and lower directions, the mounting grooves are located on the inner wall surface of the turntable shell, second sealing rings are arranged in the mounting grooves, and the second sealing rings are pressed against the outer wall surface of the brake sheet to prevent hydraulic oil from leaking.

In one embodiment, the braking member further comprises a fixed seat, a plurality of mounting holes distributed annularly are formed in the outer ring of the fixed seat, and screws are arranged in the mounting holes to fix the braking member at the bottom of the turntable cover body; the fixed seat is fixedly connected with the brake sheet through a connecting plate; the brake sheet is cylindrical, is sleeved on the outer side surface of the motor rotating shaft and is spaced from the motor rotating shaft by a certain distance.

In one embodiment, the inner annular surface of the brake sheet is provided with a plurality of arc-shaped grooves arranged along the axial direction, the arc-shaped grooves are equidistantly arranged on the inner annular surface of the brake sheet, and the arc-shaped grooves are used for enabling the brake sheet to be tightly held on the outer cylindrical surface of the rotary shaft of the rotary table through deformation.

In one embodiment, the brake sheet and the oil distribution groove are closed to form a sealed cavity, hydraulic oil is injected into the sealed cavity through the first oil injection passage, so that the middle part of the brake sheet is deformed to fold the rotating shaft of the rotary table, and the rotating shaft of the rotary table is encircled and fixed;

and or, the pressure of the hydraulic oil injected into the sealing cavity is 4-6Mpa.

In one embodiment, a high-speed turntable is further indicated, and the high-speed turntable comprises the brake structure in any one of the embodiments.

The utility model discloses the high-speed revolving stage airtight structure that above embodiment provided has following beneficial effect:

1. the utility model provides a high-speed turntable air sealing structure, the sealing structure is non-contact dynamic seal, realizes internal sealing, prevents water from entering the turntable, and influences the use of a motor and an encoder; the 1 path of gas entering the air conditioner is divided into 12 paths of gas which are uniformly distributed through the gas dividing groove in the sealing structure, and the 12 paths of gas uniformly surround the circumference to ensure that the gas is uniformly discharged.

2. The utility model provides a high-speed turntable air sealing structure, which adopts a labyrinth sealing groove, and is made into a labyrinth form, so that the external processing scraps are more difficult to enter the turntable; and the sealing gas can be more uniformly discharged from the shaft through the designed grooves.

3. The utility model provides a high-speed revolving stage brake structure, through the hydraulic oil of certain pressure of injection in the first oiling way, hydraulic oil gets into the seal chamber behind first oiling way, the second oiling way, makes the middle part of braking thin slice produce the pivot of shape diversion revolving stage and draw in, realizes the function of clamping; and the whole structure of the brake structure is compact, the brake torque is large, and larger tool fixing can be realized. The structure can be used for designing brake structures with different sizes according to application diameters, and can be used for positioning and clamping an auxiliary high-speed turntable.

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 embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic sectional view of the airtight structure of the present invention;

fig. 2 is a schematic mechanism diagram of the turntable cover according to the present invention;

FIG. 3 shows a schematic view of a portion A of FIG. 1;

fig. 4 shows a schematic structural view of a first seal ring of the present invention;

fig. 5 shows a schematic structural view of a second seal ring of the present invention;

FIG. 6 is a schematic view of a labyrinth seal assembly according to the present invention;

fig. 7 is a schematic cross-sectional view of the brake structure of the present invention;

FIG. 8 is an enlarged partial view at B of FIG. 7;

fig. 9 shows a schematic structural view of the braking member of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, and the like in a specific posture, and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, if the expression "and/or" and/or "is used throughout, the meaning includes three parallel schemes, for example," A and/or B ", including scheme A, or scheme B, or a scheme satisfying both schemes A and B. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Referring to fig. 1 to 6, an embodiment of the present invention provides an airtight structure 100, including:

a turntable cover 110, wherein a first air duct 111 is arranged in the turntable cover 110; and

a labyrinth seal assembly 120 provided on the turntable cover 110; the labyrinth seal assembly 120 has a first gas distribution groove 121, and the first gas distribution groove 121 communicates with the first air duct 111;

wherein the compressed gas in the first air passage 111 uniformly flows out of the labyrinth seal assembly 120 through the first air distribution groove 121, forming an air tight seal.

When the conventional rotary table is used, due to the fact that gas paths of the gas sealing structure 100 are unreasonable in distribution, gas is prone to being discharged unevenly, the gas sealing capability of certain point positions is possibly weak, when a large amount of cutting chips are encountered, the gas sealing has failure risk, the cutting chips enter the rotary table, and normal operation of the rotary table is affected.

In the present embodiment, the hermetic sealing structure 100 includes a turntable cover 110 and a labyrinth sealing structure disposed on the turntable cover 110, a first air duct 111 is disposed inside the turntable cover 110, the first air duct 111 is communicated with an external air source and is used for inputting compressed air into the first air duct 111, and a first air dividing groove 121 is disposed in the labyrinth sealing assembly 120, when assembling, the first air dividing groove 121 is communicated with the first air duct 111, and the compressed air is conveyed into the first air dividing groove 121 via the first air duct 111.

Specifically, the first air dividing groove 121 is a circular groove coaxial with the turntable, a plurality of air dividing passages 124 are arranged inside the first air dividing groove 121, and when compressed air enters the first air dividing groove 121, the compressed air flows along the first air dividing groove 121 to fill the whole air dividing groove, and then flows out uniformly along the plurality of air dividing passages 124 on the side wall of the first air dividing groove 121. The inside positive pressure that is of first minute gas tank 121 and to the pressure of compressed gas to each department of the inside of first minute pressure tank the same, further reposition of redundant personnel is carried out to the gas that flows out in the branch gas flue 124 through labyrinth seal subassembly 120 for gas can be even outflow labyrinth seal subassembly 120, avoids appearing the problem that the gas sealing ability of some point locations is weak.

And the path length of external cutting chips, dust, water mist and the like entering the rotary table is prolonged through the labyrinth seal assembly 120, and impurities can be effectively prevented from entering the rotary table before the air seal is effective.

Referring to fig. 4-6, in one embodiment, the labyrinth seal assembly 120 includes:

a first seal ring 122 provided on the turntable cover 110; a first gas distribution groove 121 is formed in the first sealing ring 122;

a second seal ring 123 disposed inside the first seal ring 122, the second seal ring 123 being rotatable with respect to the first seal ring 122; a gap formed between the first sealing ring 122 and the second sealing ring 123 is an airtight flow path.

In this embodiment, the first sealing ring 122 is fixedly disposed on the turntable cover 110, the second sealing ring 123 is coaxially disposed on the rotating shaft portion of the turntable, and the second sealing ring 123 is disposed inside the first sealing ring 122, and the second sealing ring 123 can perform a rotating motion relative to the first sealing ring 122 along with the rotating shaft. A first gas distribution groove 121 is formed in the first sealing ring 122, the first gas distribution groove 121 is communicated with the first air passage 111, and compressed gas uniformly distributes and flows in the first gas distribution groove 121, so that the gas pressures at different positions in the first gas distribution groove 121 are equal; compressed gas in the first gas distribution groove 121 is filled in the whole first gas distribution groove 121, the compressed gas passes through the gas distribution channel 124 on the side wall of the first gas distribution groove 121, flows out of the first sealing ring 122, enters the gas-tight flow channel formed by the first sealing ring 122 and the second sealing ring 123, flows out of the gap between the first sealing ring 122 and the second sealing ring 123 uniformly after passing through the gas-tight flow channel, gas sealing is formed, cutting scraps, water or dust and the like are blown out of the gap of the rotary table, and external pollutants are prevented from entering the rotary table.

In one embodiment, the first gas distribution groove 121 is disposed on the bottom surface of the first sealing ring 122, and the first gas distribution groove 121 is an annular groove; the bottom surface of the first gas distribution groove 121 is provided with a plurality of gas distribution channels 124, the gas distribution channels 124 penetrate through the side wall of the first sealing ring 122 to the inner wall surface of the first sealing ring 122, and the gas distribution channels 124 are uniformly distributed along the first sealing ring 122 and used for enabling compressed gas to uniformly flow into the gas-tight flow channel.

When the existing rotary table is used, due to the fact that gas paths of the gas sealing structure are unreasonable in distribution, gas is prone to being discharged unevenly, the gas sealing capability of certain point positions is possibly weak, when the existing rotary table meets the condition that more cutting chips exist, the gas sealing structure has failure risk, the cutting chips enter the rotary table, and normal operation of the rotary table is affected.

In the present embodiment, the first air dividing groove 121 is disposed on the bottom surface of the first sealing ring 122, the first sealing ring 122 is disposed as an annular groove coaxial with the first sealing ring 122, and a plurality of air dividing channels 124, preferably 12 air dividing channels 124, are disposed along the bottom surface of the first air dividing groove 121. The 12 gas distributing channels 124 are distributed on the bottom surface of the first gas distributing groove 121 in an annular and equidistant manner, and the two gas distributing channels 124 axially symmetrical along the first sealing ring 122 are coaxial, so that the two gas distributing channels 124 are symmetrically processed during production. The gas-distributing duct 124 is an L-shaped duct that rotates 90 degrees clockwise, the vertical part of the gas-distributing duct 124 is communicated with the first gas-distributing groove, and the horizontal part of the gas-distributing duct 124 penetrates through the inner ring surface of the first sealing ring.

And 12 gas distributing channels 124 are distributed on the gas distributing channel 124 at the bottom of the first gas distributing groove 121 in an annular and equidistant manner, so that compressed gas in the first gas distributing groove 121 can be uniformly guided out to the gas sealing flow channel between the first sealing ring 122 and the second sealing ring 123 and then uniformly discharged out of the worktable surface of the turntable, the purpose of uniformly discharging gas is realized, and the problem that the gas sealing capability of certain point positions is weak is avoided.

Referring to fig. 4 and 5, in one embodiment, the first sealing ring 122 has an inwardly extending annular baffle 125 inside, the annular baffle 125 is located above the second sealing ring 123, the annular baffle 125 has a downwardly protruding annular projection 1251 on a bottom surface thereof, the second sealing ring 123 has an annular recess 1231 corresponding to the annular projection 1251 on a top surface thereof, and the annular recess 1231 has a depth greater than a length of the annular projection 1251, and the annular recess 1231 is used for accommodating debris particles that cannot be blown out of the hermetic flow passage by the compressed gas;

and/or the outer wall of the second sealing ring 123 is provided with a second gas distribution groove.

In the present embodiment, the inner side of the first sealing ring 122 is an annular baffle 125 extending inward, and when the first sealing ring 122 and the second sealing ring 123 are assembled, the annular baffle 125 is located above the second sealing ring 123, and the bottom surface of the annular baffle 125 has an annular protrusion 1251 protruding downward from the bottom surface, and the top surface of the second sealing ring 123 has an annular recess 1231 corresponding to the annular protrusion.

The depth of the annular concave position 1231 is greater than the length of the annular convex block 1251, a labyrinth seal gap is formed between the annular convex block 1251 and the annular concave position 1231, and the bottom of the annular concave position 1231 is used for accommodating large cutting chips or ash particles which enter an airtight flow channel and cannot be blown out by airflow, so that the particles are prevented from directly entering the rotary table; through labyrinth seal clearance, can prolong the inside route of external particulate matter entering revolving stage, through the compressed gas who flows along the airtight runner, can blow out most granule debris, even have the large granule debris that can't blow off, also can deposit in the bottom of annular concave position 1231, have better airtight performance.

In one embodiment, the turntable cover 110 has a receiving recess for receiving and mounting the first sealing ring 122; the bottom surface of the accommodating recess is provided with a first mounting ring groove and a second mounting ring groove which are coaxial, and the air outlet of the first air duct 111 is positioned between the first mounting ring groove and the second mounting ring groove; and first sealing rings are arranged in the first mounting ring groove and the second mounting ring groove.

In the present embodiment, the turntable cover 110 has a receiving recess for receiving and mounting the first sealing ring 122, and when the first sealing ring 122 is positioned and mounted in the receiving recess, the first sealing ring 122 is fixed on the turntable cover 110 by providing a screw in the mounting hole on the outer circumferential surface of the first sealing ring 122 and penetrating through the mounting hole to the turntable cover 110.

And a first mounting ring groove and a second mounting ring groove which are coaxial are arranged on the bottom surface of the accommodating notch, the gas outlet of the first air duct 111 is positioned in the annular band between the first mounting ring groove and the second mounting ring groove, the first sealing ring is an O-shaped sealing ring and is pressed between the groove bottom and the first sealing ring 122 during mounting, and the first sealing ring is particularly pressed on the inner ring side and the outer ring side of the first gas distribution groove at the bottom of the first sealing ring respectively, so that the sealing performance of the joint of the first sealing ring 122 and the turntable cover body 110 is improved, and compressed gas is prevented from leaking along a tiny gap at the joint.

Referring to fig. 2, 7-9, in one embodiment, a brake structure 200 is further illustrated, including:

a turntable housing 210, the turntable housing 210 having a first oil injection passage 211;

the turntable cover body 110 is arranged at the top of the turntable shell 210, the turntable cover body 110 is provided with a second oil injection passage 115, an oil distribution groove 116 is formed in the inner wall surface of the turntable cover body 110, and the oil distribution groove 116 is communicated with the second oil injection passage 115;

a stopper 220 provided at the bottom of the turntable cover 110, the stopper 220 having a stopper sheet 221, the stopper sheet 221 being attached to an inner wall surface of the turntable cover 110;

wherein the turntable housing 210 is provided with the airtight structure 100 as described in any one of the above embodiments.

Since the conventional turntable brake structure 200 is mainly implemented in the form of a brake pad, that is, a thin brake pad with a thickness of 1-2mm is mounted on a rotating shaft system, when braking is required, a piston is pushed to the outside of the brake pad through a cylinder or an oil cylinder, so that the brake pad is deformed and completely attached to a static surface arranged in the axial direction, and thus, sufficient friction force is generated to resist the load of the shaft system. However, the installation accumulated error exists between the brake pad and the piston, and the complete fitting of the fitting surface of the brake pad and the piston is difficult to ensure, so that the braking effect is poor.

In the present embodiment, the turntable case 210 has a first fill oil passage 211; the turntable cover body 110 arranged at the top of the turntable shell 210 is provided with a second oil injection passage 115, the second oil injection passage 115 is communicated with the first oil injection passage 211, and the inner wall surface of the turntable cover body 110 is provided with an oil distribution groove 116 communicated with the second oil injection passage 115; the brake member 220 is arranged at the bottom of the turntable cover body 110, the brake member 220 is provided with a brake sheet 221, the brake sheet 221 is attached to the oil distribution groove 116 on the inner wall surface of the turntable cover body 110, and the brake sheet 221 and the oil distribution groove 116 form a sealed cavity for containing hydraulic oil;

hydraulic oil with certain pressure is injected into the first oil injection passage 211, and the hydraulic oil enters the sealing cavity after passing through the first oil injection passage 115 and the second oil injection passage 115, so that the brake sheet 221 is deformed along with the hydraulic oil, and the clamping function is realized; the structure is compact; brake moment is great, can fix bigger frock. The structure can design the brake structures 200 with different sizes according to the application diameters, so that the rotary table is compact as a whole.

Referring to fig. 8, in one embodiment, the first oil injection passage 211 is an L-shaped oil injection passage, and a vertical portion of the first oil injection passage 211 is communicated with the second oil injection passage 115; an oil outlet of the horizontal portion of the second oil injection passage 115 is communicated with the oil distribution groove 116.

In one embodiment, the oil distribution groove 116 is provided with mounting grooves in the inner wall surface of the turntable housing 210 in the vertical direction, and second sealing rings are disposed in the mounting grooves and abut against the outer wall surface of the braking sheet 221 to prevent hydraulic oil from leaking.

In this embodiment, by providing the mounting groove in the vertical direction of the oil distribution groove 116, and providing the second sealing ring in the mounting groove, where the second sealing ring is an O-shaped sealing ring, the second sealing ring abuts against the bottom of the mounting groove and the outer wall surface of the braking sheet 221, so as to prevent the hydraulic oil from leaking along a small gap at the joint of the braking sheet 221 and the turntable housing 210 when the middle of the braking sheet 221 deforms and contracts to hold the turntable shaft tightly.

Referring to fig. 9, in one embodiment, the braking member 220 further includes a fixing seat 222, a plurality of mounting holes distributed annularly are formed in an outer ring of the fixing seat 222, and screws are disposed in the mounting holes to fix the braking member 220 to the bottom of the turntable cover 110; the fixing seat 222 is fixedly connected with the brake sheet 221 through a connecting plate; the brake sheet 221 is cylindrical, is sleeved on the outer side surface of the motor rotating shaft, and is spaced from the motor rotating shaft by a certain distance.

In this embodiment, the fixing base 222 is connected to the braking sheet 221 in a cylindrical shape through a horizontal connecting plate; the fixing seat 222 is fixed at the bottom of the turntable cover 110 by arranging screws in the mounting holes on the outer ring surface, and the cylindrical brake sheet 221 is sleeved outside the turntable rotating shaft, and a certain distance is left between the brake sheet 221 and the motor rotating shaft.

Referring to fig. 9, in one embodiment, the inner annular surface of the brake sheet 221 has a plurality of arc-shaped grooves 223 arranged along the axial direction, a plurality of the arc-shaped grooves 223 are equidistantly arranged on the inner annular surface of the brake sheet, and the arc-shaped grooves 223 are used for enabling the brake sheet 221 to be tightly held on the outer cylindrical surface of the rotating shaft of the turntable through deformation.

Because the existing rotary table brake structure 200 is mainly realized through a brake block form, when braking is needed, a piston is pushed and pressed to the outside of the brake block through a cylinder or an oil cylinder, so that the brake block is deformed and completely attached to a static surface which is arranged in the axial direction, and sufficient friction force is generated to resist the load of a shaft system. However, the installation accumulated error exists between the brake pad and the piston, and the complete fitting of the fitting surface of the brake pad and the piston is difficult to ensure, so that the braking effect is poor.

In this embodiment, the plurality of arc-shaped grooves 223 are arranged at equal intervals on the inner annular surface of the brake sheet 221, when the brake sheet 221 is deformed under the action of hydraulic oil and is folded towards the rotary table rotating shaft, the part of the arc-shaped groove 223 is deformed and contracted first, other annular surface parts on the inner side of the brake sheet 221 keep the original radius size, and are completely attached to the rotary table rotating shaft along with the folding of the brake sheet 221, because the annular surface parts of the brake sheet 221 are not deformed in the tightening process, and the brake sheet 221 is driven in a mode of applying acting force in an annular mode through the hydraulic oil in the sealing cavity, the problem that the brake sheet 221 is seriously worn locally is avoided, the brake sheet 221 can be ensured to be completely attached to the rotary table rotating shaft, and the braking effect is ensured.

In one embodiment, the brake sheet 221 and the oil distribution groove 116 are closed to form a sealed cavity, and hydraulic oil is injected into the sealed cavity through the first oil injection channel 211, so that the middle part of the brake sheet 221 is deformed to fold the rotating shaft of the rotary table, and the rotating shaft of the fixed rotary table is surrounded;

In this embodiment, hydraulic oil with a certain pressure is injected into the first oil injection passage 211, and the hydraulic oil enters the sealing cavity after passing through the first oil injection passage 211 and the second oil injection passage 115, so that the middle part of the brake sheet 221 is deformed and folded towards the rotating shaft of the rotating table, and the clamping function is realized; the whole compact structure of the brake structure 200 that this embodiment provided, brake moment is great, can realize that bigger frock is fixed. The structure can design the brake structures 200 with different sizes according to the application diameters, so that the rotary table is compact as a whole.

Specifically, the pressure of the hydraulic oil injected into the first oil injection passage 211 ranges from 4 to 6Mpa, and preferably 5.5Mpa.

In one embodiment, the high-speed turntable comprises the brake structure in any one of the embodiments.

The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.

Claims

1. A hermetic sealing structure, comprising:

the rotary table cover body is internally provided with a first air duct; and

2. The hermetic sealing structure according to claim 1, wherein the labyrinth seal assembly comprises:

3. The hermetic sealing structure according to claim 2, wherein the first gas distribution groove is provided at a bottom surface of the first seal ring, and the first gas distribution groove is an annular groove; the bottom surface of the first air distribution groove is provided with a plurality of air distribution channels, the air distribution channels penetrate through the side wall of the first sealing ring and the inner wall surface of the first sealing ring, and the air distribution channels are uniformly distributed along the circumferential direction of the first sealing ring and used for enabling compressed air to uniformly flow into the air sealing flow channel.

4. The hermetic sealing structure according to claim 3, wherein the first sealing ring has an inwardly extending annular baffle inside, the annular baffle is located above the second sealing ring, the annular baffle has a downwardly protruding annular projection on a bottom surface thereof, the second sealing ring has an annular recess on a top surface thereof corresponding to the annular projection, the annular recess has a depth greater than a length of the annular projection, and the annular recess is configured to receive debris particles that cannot be blown out of the hermetic sealing flow passage by the compressed gas.

5. The hermetic sealing structure according to claim 4, wherein the turntable cover has a receiving recess for receiving and mounting the first sealing ring; the bottom surface of the accommodating recess is provided with a first mounting ring groove and a second mounting ring groove which are coaxial, and the air outlet of the first air duct is positioned between the first mounting ring groove and the second mounting ring groove; and first sealing rings are arranged in the first mounting ring groove and the second mounting ring groove.

6. The utility model provides a brake structure, sets up in the pivot outside of revolving stage, its characterized in that includes:

a turntable housing having a first oil injection passage;

the turntable cover body is arranged at the top of the turntable shell and provided with a second oil injection channel, an oil distribution groove is formed in the inner wall surface of the turntable cover body, and the oil distribution groove is communicated with the second oil injection channel;

wherein the turntable housing is provided with a hermetic sealing structure according to any one of claims 1 to 5.

7. The brake structure according to claim 6, wherein the first oil injection passage is an L-shaped oil injection passage, and a vertical portion of the first oil injection passage communicates with the second oil injection passage; and an oil outlet of the horizontal part of the second oil injection passage is communicated with the oil distribution groove.

8. The brake structure of claim 7, wherein the oil distribution groove is provided with an installation groove in the upper and lower directions on the inner wall surface of the turntable housing, and a second sealing ring is arranged in the installation groove and is pressed against the outer wall surface of the brake sheet to prevent the leakage of the hydraulic oil.

9. The brake structure of claim 8, wherein the brake member further comprises a fixing seat, the outer ring of the fixing seat is provided with a plurality of mounting holes distributed annularly, and screws are arranged in the mounting holes to fix the brake member at the bottom of the turntable cover; the fixed seat is fixedly connected with the brake sheet through a connecting plate; the brake sheet is cylindrical, is sleeved on the outer side surface of the motor rotating shaft and is spaced from the motor rotating shaft by a certain distance.

10. The brake structure of claim 9, wherein the inner circumferential surface of the brake sheet has a plurality of arc-shaped grooves arranged along the axial direction, a plurality of the arc-shaped grooves are equidistantly arranged on the inner circumferential surface of the brake sheet, and the arc-shaped grooves are used for enabling the brake sheet to be tightly held on the outer circumferential surface of the rotating shaft of the turntable through deformation.

11. A high-speed turntable comprising a brake structure according to any one of claims 6 to 10.