CN114536033A

CN114536033A - Double-spiral suspended high-precision hydrostatic pressure rotary table

Info

Publication number: CN114536033A
Application number: CN202210090194.3A
Authority: CN
Inventors: 王少力; 薛敬宇; 陆洁; 向天羽; 王帅
Original assignee: Hunan Institute of Engineering
Current assignee: Hunan Institute of Engineering
Priority date: 2022-01-25
Filing date: 2022-01-25
Publication date: 2022-05-27
Anticipated expiration: 2042-01-25
Also published as: CN114536033B

Abstract

The invention relates to a double-spiral suspended high-precision hydrostatic pressure rotary table, which comprises a base, a cylinder body rotationally mounted on the base and a boss fixed on the cylinder body, wherein a protruding ring and a protruding column are fixedly arranged on the boss, two annular grooves for the protruding ring and the protruding column to penetrate into are formed on the cylinder body and fixed with the protruding ring and the protruding column, a first thread groove is formed on the periphery of the protruding column, a second thread groove is formed on the inner wall of one annular groove, the first thread groove and the second thread groove form a first thread oil cavity, a third thread groove and a fourth thread groove are respectively formed on the outer wall of the protruding ring and the inner wall of the other annular groove, the third thread groove and the fourth thread groove form a second thread oil cavity, the hydrostatic pressure rotary table has high practicability and stability, and in the actual workpiece processing, the machining precision of the final workpiece can be effectively improved, and the method is suitable for popularization and application.

Description

Double-spiral suspended high-precision hydrostatic pressure rotary table

Technical Field

The invention relates to the technical field of static pressure rotary tables, in particular to a double-spiral suspension type high-precision hydrostatic pressure rotary table.

Background

The hydrostatic pressure turntable is a functional part which adopts a hydrostatic pressure bearing as a support and structurally integrates the functions of a main shaft of the turntable and a motor into a whole, and the function of the hydrostatic pressure turntable drives the workpiece to rotate so as to carry out precision machining. With the rapid development of various industries, the static pressure rotary table is widely used in the production of various industries for the convenience of production.

At present, a large-scale ultra-precise rotary table is a key functional part of a precise and ultra-precise machine tool. In order to meet the requirements of large load, high rigidity and high rotation precision, the ultra-precise turntable basically adopts a hydrostatic bearing support mode. To improve the static and dynamic stiffness of the turret, the hydrostatic bearing needs to adjust the oil chamber fluid pressure to accommodate changes in external loads by varying the flow of fluid into the oil chamber.

The existing hydrostatic pressure rotary table has the advantages that in the actual processing and use of workpieces, the stability is difficult to achieve the ideal effect, the friction is large, the processing precision of the workpieces is not improved, and therefore the processing effect of the final workpieces is affected.

Disclosure of Invention

The invention aims to provide a double-spiral suspension type high-precision hydrostatic pressure rotary table to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

a double-spiral suspension type high-precision hydrostatic pressure rotary table comprises a base, a cylinder body rotatably mounted on the base, a boss fixed on the cylinder body, and a power mechanism used for driving the cylinder body to rotate, wherein a protruding ring and a protruding column are fixedly arranged on the boss, and two annular grooves used for the protruding ring and the protruding column to penetrate into and be fixed with the cylinder body are formed in the cylinder body;

the outer periphery of the protruding column is provided with a first thread groove, the inner wall of one of the annular grooves is provided with a second thread groove, the first thread groove and the second thread groove form a first thread oil cavity, the outer wall of the protruding ring and the inner wall of the other annular groove are respectively provided with a third thread groove and a fourth thread groove, and the third thread groove and the fourth thread groove form a second thread oil cavity;

first screw thread oil pocket with the two screw thread of second screw thread oil pocket revolves to opposite, just still install the oil storage tank on the base, first screw thread oil pocket with second screw thread oil pocket respectively through a set of pump oil mechanism with the oil storage tank is connected, there is the revolving stage that is used for placing the work piece through a plurality of backup pad fixed mounting on the boss, just be provided with a plurality of holders that are used for carrying out the centre gripping to the work piece and fix along the circumference on the revolving stage, the holder is the arc form and sets up, and with install adjustment mechanism on the boss connects.

As a further scheme of the invention: the power mechanism comprises a bevel gear ring fixedly mounted on the periphery of the cylinder, a bevel gear rotatably mounted on the base and meshed with the bevel gear ring, and a first motor mounted on the base, wherein the rotating shaft of the bevel gear is connected with the output end of the first motor.

As a still further scheme of the invention: the pump oil mechanism is including installing pump body on the base and installing the second motor of pump body lateral part, the drive shaft of the pump body with the output of second motor is connected, and its water inlet pass through the pipeline with the oil storage tank intercommunication, the inside of cylinder is provided with two cavities, the cavity with first screw thread oil pocket with second screw thread oil pocket intercommunication, the delivery port of the pump body through a set of conducting structure with the cavity intercommunication, the cavity still through a set of conducting structure with the oil storage tank is connected.

As a still further scheme of the invention: the conduction structure establishes including the cover first lantern ring and second lantern ring in the cylinder periphery, the inside cavity of the two, first lantern ring with the inside cavity of second lantern ring, and the two inner wall and all seted up the opening along circumference equidistance in the periphery of cylinder, first lantern ring with the second lantern ring all with the cylinder is sealed to rotate and is connected, first lantern ring passes through the feed liquor union coupling the delivery port of the pump body, the second lantern ring through one-way conduction structure with the oil storage tank intercommunication.

As a still further scheme of the invention: it includes fixed mounting and is in be interrupted the conduction structure on the base and with drain pipe and the installation of second lantern ring intercommunication one-way valve on the drain pipe, the terminal connecting pipe through being "Y" shape setting of drain pipe with the oil storage tank intercommunication.

As a still further scheme of the invention: the adjusting mechanism comprises a plurality of groups of sliding assemblies arranged on the rotating platform and self-locking assemblies arranged on the bosses, and the sliding assemblies are connected with the clamping pieces.

As a still further scheme of the invention: the self-locking assembly comprises a worm wheel and a worm which are rotatably installed on the boss and a disc which is coaxially and fixedly installed with the worm wheel, wherein a knob is fixedly arranged at one end of the worm, and the worm wheel is meshed with the worm.

As a still further scheme of the invention: a plurality of chutes are formed in the rotating platform along the circumference at equal intervals, the sliding assembly is arranged in the chutes in a sliding mode and is fixedly connected with a sliding block and a clamping piece, a fixed column and a driving rod are fixedly arranged on the periphery of the disc, a strip-shaped through groove is formed in the driving rod, and the fixed column penetrates through the strip-shaped through groove.

Compared with the prior art, the invention has the beneficial effects that: the invention has novel design, in the processing process, two groups of oil pumping mechanisms work to pump the oil in the oil storage tank into the first thread oil cavity and the second thread oil cavity respectively, and because the thread turning directions of the first thread oil cavity and the second thread oil cavity are opposite, a stable and high-strength bearing oil film is formed between static pressure state friction pairs, and meanwhile, the periphery of the central shaft core is stressed and is in a suspension state, the friction is reduced, and the oil films in the two spiral oil cavity spirals play a role in stabilizing the central shaft core. The static pressure rotary table is high in practicability and stability, can effectively improve the machining precision of a final workpiece in actual workpiece machining, and is suitable for popularization and use.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of a double-spiral suspension type high-precision hydrostatic pressure rotary table.

Fig. 2 is a schematic structural diagram of another angle of one embodiment of the double-spiral suspension type high-precision hydrostatic pressure rotary table.

Fig. 3 is a schematic structural diagram of another angle of an embodiment of a double-spiral suspension type high-precision hydrostatic pressure rotary table.

Fig. 4 is a schematic diagram of a partial explosion of an embodiment of a double-spiral suspension type high-precision hydrostatic pressure rotary table.

Fig. 5 is a schematic structural view of fig. 4 from another angle.

Fig. 6 is an enlarged view of a structure at a in fig. 3.

Fig. 7 is an enlarged view of the structure at B in fig. 3.

Fig. 8 is an exploded view of the adjusting mechanism in an embodiment of the double-spiral suspension type high-precision hydrostatic pressure rotary table.

In the figure: 1-a base; 2-a column; 3-boss; 4-a projecting ring; 5-protruding columns; 6-an annular groove; 7-a first thread groove; 8-a second thread groove; 9-a third thread groove; 10-a fourth thread groove; 11-a first collar; 12-a second collar; 13-a one-way valve; 14-a liquid inlet pipe; 15-a liquid outlet pipe; 16-a bevel gear ring; 17-bevel gears; 18-a first electric machine; 19-an oil storage tank; 20-connecting pipe; 21-a rotating table; 22-a slide block; 23-fixing columns; 24-a clamp; 25-a disc; 26-a drive rod; 27-a worm gear; 28-a worm; 29-knob; 30-a pump body; 31-a second motor; 32-a chute; 33-support plate.

Detailed Description

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

In addition, an element of the present invention may be said to be "fixed" or "disposed" to another element, either directly on the other element or with intervening elements present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Referring to fig. 1-8, in an embodiment of the present invention, a double-spiral suspension type high-precision hydrostatic pressure rotary table includes a base 1, a cylinder 2 rotatably installed on the base 1, and a boss 3 fixed on the cylinder 2, where the base 1 is further provided with a power mechanism for driving the cylinder 2 to rotate;

wherein, a protruding ring 4 and a protruding column 5 are fixedly arranged on the boss 3, and two annular grooves 6 for the protruding ring 4 and the protruding column 5 to penetrate into and be fixed with are arranged on the column body 2;

the periphery of the protruding column 5 is provided with a first thread groove 7, the inner wall of one of the annular grooves 6 is provided with a second thread groove 8, the first thread groove 7 and the second thread groove 8 form a first thread oil cavity, the outer wall of the protruding ring 4 and the inner wall of the other annular groove 6 are respectively provided with a third thread groove 9 and a fourth thread groove 10, the third thread groove 9 and the fourth thread groove 10 form a second thread oil cavity, the thread directions of the first thread oil cavity and the second thread oil cavity are opposite, an oil storage tank 19 is further mounted on the base 1, and the first thread oil cavity and the second thread oil cavity are respectively connected with the oil storage tank 19 through a group of oil pumping mechanisms;

there is the revolving stage 21 that is used for placing the work piece through a plurality of backup pad 33 fixed mounting on the boss 3, just be provided with a plurality of holders 24 that are used for carrying out the centre gripping to the work piece and fix along the circumference on the revolving stage 21, holder 24 is the arc form setting, and installs adjustment mechanism on the boss 3 is connected.

It should be noted that the center axes of the rotary table 21, the column 2, and the boss 3 are coincident with each other.

In the embodiment of the invention, when the power mechanism works, a workpiece to be machined is placed on the rotating table 21, then the adjusting mechanism works to drive the plurality of clamping pieces 24 to simultaneously move linearly towards the center of the rotating table 21, so that the clamping pieces 24 can finally clamp the workpiece, the synchronism of the workpiece rotating along with the cylinder 2, the boss 3 and the rotating table 21 is ensured, the stability of the workpiece is greatly improved, and the subsequent machining precision is ensured;

in the processing process, the two groups of oil pumping mechanisms work to pump the oil in the oil storage tank 19 into the first thread oil cavity and the second thread oil cavity respectively, and because the thread turning directions of the first thread oil cavity and the second thread oil cavity are opposite, a stable and high-strength bearing oil film is formed between static pressure state friction pairs, and meanwhile, the periphery of the central shaft core is stressed and is in a suspension state, friction is reduced, and the oil films in the two spiral oil cavity spirals play a role in stabilizing the central shaft core.

In conclusion, the static pressure rotary table is high in practicability and stability, can effectively improve the machining precision of a final workpiece in actual workpiece machining, and is suitable for popularization and application.

As an embodiment of the present invention, the power mechanism includes a bevel gear ring 16 fixedly installed on the outer periphery of the cylinder 2, a bevel gear 17 rotatably installed on the base 1 and engaged with the bevel gear ring 16, and a first motor 18 installed on the base 1, and a rotating shaft of the bevel gear 17 is connected to an output end of the first motor 18.

In the embodiment of the present invention, in practical use, after the clamping member 24 has finished clamping the workpiece, the first motor 18 starts to operate to drive the bevel gear 17 to rotate, so that the bevel gear 17 drives the cylinder 2 to rotate through the bevel gear ring 16, so that the workpiece follows the cylinder 2, the boss 3 and the rotating table 21 to rotate synchronously, and the processing of the workpiece can be started.

It should be noted that the first motor 18 is a servo motor whose output end can be driven bidirectionally, a 4IK/80 yyyjt type motor can be used, the type motor has stable performance, and other types of motors can be used as long as the driving requirements are met, which is not specifically limited in this application.

As an embodiment of the present invention, the oil pumping mechanism includes a pump body 30 mounted on the base 1 and a second motor 31 mounted on a side portion of the pump body 30, a driving shaft of the pump body 30 is connected to an output end of the second motor 31, a water inlet of the pump body is communicated with the oil storage tank 19 through a pipeline, two cavities are disposed inside the column body 2, the cavities are communicated with the first threaded oil cavity and the second threaded oil cavity, a water outlet of the pump body 30 is communicated with the cavities through a set of conducting structures, and the cavities are further connected with the oil storage tank 19 through a set of conducting structures.

Referring to fig. 4 and 5 again, the conduction structure includes a first collar 11 and a second collar 12 sleeved on the periphery of the cylinder 2, the first collar 11 and the second collar 12 are hollow inside, the inner walls of the first collar 11 and the second collar 12 and the periphery of the cylinder 2 are provided with openings at equal intervals along the circumference, the first collar 11 and the second collar 12 are both connected with the cylinder 2 in a sealing and rotating manner, the first collar 11 is connected with the water outlet of the pump body 30 through a liquid inlet pipe 14, and the second collar 12 is communicated with the oil storage tank 19 through a one-way conduction structure.

Referring to fig. 7 again, the discontinuous conduction structure includes a liquid outlet pipe 15 fixedly installed on the base 1 and communicated with the second lantern ring 12, and a one-way valve 13 installed on the liquid outlet pipe 15, and a terminal of the liquid outlet pipe 15 is communicated with the oil storage tank 19 through a connecting pipe 20 arranged in a "Y" shape.

It should be added that a vertical plate (not numbered) is vertically fixed on the base 1, and the first collar 11 and the second collar 12 are fixed to the vertical plate through the liquid inlet pipe 14 and the liquid outlet pipe 15, respectively.

In the embodiment of the present invention, when the second motor 31 is operated, the pump body 30 pumps oil in the oil storage tank 19 into the first collar 11 through the liquid inlet pipe 14 at the water outlet thereof, then, the oil is filled into the first threaded oil chamber and the second threaded oil chamber through the through holes on the inner wall of the first collar 11 and on the outer periphery of the cylinder 2, and the oil discharged from the first threaded oil chamber and the second threaded oil chamber flows back into the oil storage tank 19 through the second collar 12, the liquid outlet pipe 15 and the connecting pipe 20, so that the circulation of filling oil into the first threaded oil chamber and the second threaded oil chamber is realized. In the oil filling process, the filling directions of the oil in the first threaded oil cavity and the oil in the second threaded oil cavity are opposite, so that a stable and high-strength bearing oil film is formed between the static pressure state friction pairs.

Referring to fig. 6 and 8 again, as an embodiment of the present invention, the adjusting mechanism includes a plurality of sets of sliding assemblies mounted on the rotating table 21 and a self-locking assembly mounted on the boss 3, and the sliding assemblies are connected to the clamping member 24. The self-locking assembly comprises a worm wheel 27 and a worm 28 which are rotatably arranged on the boss 3 and a disc 25 which is coaxially and fixedly arranged with the worm wheel 27, a knob 29 is fixedly arranged at one end of the worm 28, and the worm wheel 27 is meshed with the worm 28.

A plurality of chutes 32 are formed in the rotating platform 21 at equal intervals along the circumference, the sliding assembly includes a sliding block 22 which is slidably disposed in the chute 32 and is fixedly connected to the clamping member 24, a fixing column 23 which is fixedly disposed on the sliding block 22, and a driving rod 26 which is fixedly mounted on the periphery of the disc 25, a strip-shaped through groove is formed in the driving rod 26, and the fixing column 23 penetrates through the strip-shaped through groove.

In the embodiment of the present invention, when a workpiece is fixed, the workpiece is placed on the rotating table 21, and then the worm 28 is rotated by the knob 29, so that the worm 28 drives the worm wheel 27 and the disc 25 to rotate, the disc 25 drives the driving rod 26 to rotate, and correspondingly, the driving rod 26 drives the slider 22 to slide in the chute 32 towards the center of the rotating table 21 through the fixing post 23, so that the workpiece is fixed by the clamping member 24, and because the worm wheel 27 and the worm 28 have a self-locking characteristic, the stability of the clamping member 24 for fixing the workpiece is effectively ensured, and the machining precision of the final workpiece is guaranteed.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A double-spiral suspension type high-precision hydrostatic pressure rotary table is characterized by comprising a base (1), a cylinder (2) rotatably mounted on the base (1) and a boss (3) fixed on the cylinder (2), wherein the base (1) is also provided with a power mechanism for driving the cylinder (2) to rotate;

wherein, a protruding ring (4) and a protruding column (5) are fixedly arranged on the boss (3), and two annular grooves (6) for the protruding ring (4) and the protruding column (5) to penetrate into for fixing with are arranged on the column body (2);

a first thread groove (7) is formed in the periphery of the protruding column (5), a second thread groove (8) is formed in the inner wall of one annular groove (6), the first thread groove (7) and the second thread groove (8) form a first thread oil cavity, a third thread groove (9) and a fourth thread groove (10) are formed in the outer wall of the protruding ring (4) and the inner wall of the other annular groove (6) respectively, and the third thread groove (9) and the fourth thread groove (10) form a second thread oil cavity;

the screw thread rotating directions of the first screw thread oil cavity and the second screw thread oil cavity are opposite, an oil storage tank (19) is further mounted on the base (1), and the first screw thread oil cavity and the second screw thread oil cavity are respectively connected with the oil storage tank (19) through a group of oil pumping mechanisms;

boss (3) are gone up and are had revolving stage (21) that are used for placing the work piece through a plurality of backup pads (33) fixed mounting, just revolving stage (21) are gone up and are provided with a plurality of holders (24) that are used for carrying out the centre gripping to the work piece and fix along the circumference, holder (24) are the arc form setting, and with install adjustment mechanism on boss (3) is connected.

2. The double-spiral suspension type high-precision hydrostatic pressure rotary table according to claim 1, wherein the power mechanism comprises a bevel gear ring (16) fixedly mounted on the outer periphery of the cylinder (2), a bevel gear (17) rotatably mounted on the base (1) and meshed with the bevel gear ring (16), and a first motor (18) mounted on the base (1), and the rotating shaft of the bevel gear (17) is connected with the output end of the first motor (18).

3. The double-helix suspended high-precision hydrostatic pressure rotary table according to claim 1, wherein the oil pumping mechanism comprises a pump body (30) mounted on the base (1) and a second motor (31) mounted on the side of the pump body (30), the driving shaft of the pump body (30) is connected with the output end of the second motor (31), and the water inlet of the pump body is communicated with the oil storage tank (19) through a pipeline;

the inside of cylinder (2) is provided with two cavities, the cavity with first screw thread oil pocket with second screw thread oil pocket intercommunication, the delivery port of the pump body (30) through a set of conduction structure with the cavity intercommunication, the cavity still through a set of conduction structure with oil storage tank (19) are connected.

4. The double-helix suspension type high-precision hydrostatic pressure rotary table according to claim 3, wherein the conducting structure comprises a first sleeve ring (11) and a second sleeve ring (12) which are sleeved on the outer periphery of the cylinder (2) and are hollow inside, the first sleeve ring (11) and the second sleeve ring (12) are hollow inside, and through holes are formed in the inner walls of the first sleeve ring and the second sleeve ring and on the outer periphery of the cylinder (2) at equal intervals along the circumference;

first lantern ring (11) with second lantern ring (12) all with cylinder (2) sealed rotation is connected, first lantern ring (11) are connected through feed liquor pipe (14) the delivery port of the pump body (30), second lantern ring (12) through one-way conduction structure with oil storage tank (19) intercommunication.

5. The double-helix suspended high-precision hydrostatic pressure rotary table according to claim 4, wherein the discontinuous conduction structure comprises a liquid outlet pipe (15) fixedly installed on the base (1) and communicated with the second sleeve ring (12), and a one-way valve (13) installed on the liquid outlet pipe (15), and the tail end of the liquid outlet pipe (15) is communicated with the oil storage tank (19) through a connecting pipe (20) arranged in a Y shape.

6. The double-helix suspension type high-precision hydrostatic pressure rotary table according to claim 1, wherein the adjusting mechanism comprises a plurality of sets of sliding assemblies mounted on the rotary table (21) and a self-locking assembly mounted on the boss (3), and the sliding assemblies are connected with the clamping members (24).

7. The double-helix suspension type high-precision hydrostatic pressure rotary table according to claim 6, wherein the self-locking assembly comprises a worm wheel (27) and a worm (28) which are rotatably installed on the boss (3), and a disc (25) which is coaxially and fixedly installed with the worm wheel (27), a knob (29) is fixedly arranged on one end of the worm (28), and the worm wheel (27) is meshed with the worm (28).

8. The double-spiral suspension type high-precision hydrostatic pressure rotary table according to claim 7, wherein the rotary table (21) is provided with a plurality of sliding grooves (32) at equal intervals along the circumference, and the sliding assembly comprises a sliding block (22) which is slidably arranged in the sliding grooves (32) and fixedly connected with the clamping piece (24), a fixed column (23) which is fixedly arranged on the sliding block (22), and a driving rod (26) which is fixedly arranged on the periphery of the disc (25);

a strip-shaped through groove is formed in the driving rod (26), and the fixing column (23) penetrates through the strip-shaped through groove.