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

Abstract

The invention relates to a double-spiral suspension type high-precision hydrostatic turntable, comprising a base, a cylinder rotatably mounted on the base, and a boss fixed on the cylinder, and a protrusion is fixedly arranged on the boss. a ring and a protruding post, and the post body is provided with two annular grooves for the protruding ring and the protruding post to penetrate to be fixed therewith, and a first thread groove is provided on the outer periphery of the protruding post , the inner wall of one of the annular grooves is provided with a second threaded groove, the first threaded groove and the second threaded groove form a first threaded oil cavity, and the outer wall of the protruding ring is connected to the other annular groove. A third thread groove and a fourth thread groove are respectively opened on the inner wall of the groove, and the third thread groove and the fourth thread groove form a second thread oil cavity. In the actual workpiece machining, the machining accuracy of the final workpiece can be effectively improved, and it is suitable for popularization and use.

Description

A double-spiral suspension type high-precision hydrostatic turntable

technical field

The invention relates to the related technical field of hydrostatic turntables, in particular to a double-spiral suspension type high-precision hydrostatic turntable.

Background technique

The hydrostatic rotary table is a functional component that adopts the hydrostatic bearing as the support, and integrates the function of the main shaft of the rotary table with the function of the motor. Its function drives the workpiece to rotate for precision machining. With the rapid development of all walks of life, in order to facilitate the production, the hydrostatic rotary table is widely used in the production of many industries.

At present, large ultra-precision rotary tables are the key functional components of precision and ultra-precision machine tools. In order to meet the requirements of large load, high rigidity and high rotation accuracy, the ultra-precision turntable is basically supported by hydrostatic bearing. In order to improve the static and dynamic stiffness of the turntable, the hydrostatic bearing needs to adjust the fluid pressure of the oil chamber by changing the flow rate of the fluid flowing into the oil chamber to adapt to the change of the external load.

The stability of the existing hydrostatic rotary table is difficult to achieve the desired effect in actual workpiece processing, and the friction is large, which is not conducive to the improvement of workpiece machining accuracy, thereby affecting the final workpiece machining effect.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a double-spiral suspension type high-precision hydrostatic turntable to solve the above-mentioned problems in the background art.

To achieve the above object, the present invention provides the following technical solutions:

A double-spiral suspension type high-precision hydrostatic turntable includes a base, a cylinder rotatably mounted on the base, and a boss fixed on the cylinder, and the base is also installed with a base for driving the A power mechanism for cylinder rotation, wherein a protruding ring and a protruding post are fixedly arranged on the boss, and two protruding rings and protruding posts are opened on the cylinder for penetrating the protruding ring and the protruding post to connect with the protruding ring. fixed annular groove;

A first threaded groove is formed on the outer circumference of the protruding column, and a second threaded groove is formed on the inner wall of one of the annular grooves, and the first threaded groove and the second threaded groove form a first threaded 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;

The threads of the first threaded oil cavity and the second threaded oil cavity are in opposite directions, and an oil storage tank is also installed on the base, the first threaded oil cavity and the second threaded oil cavity Each is connected to the oil storage tank through a set of oil pumping mechanisms, the boss is fixedly installed with a rotary table for placing the workpiece through a plurality of support plates, and the rotary table is provided with a plurality of A clamping piece for clamping and fixing the workpiece, the clamping piece is arranged in an arc shape, and is connected with an adjusting mechanism installed on the boss.

As a further solution of the present invention: the power mechanism includes a bevel gear ring fixedly mounted on the outer periphery of the cylinder, a bevel gear rotatably mounted on the base and meshing with the bevel gear ring, and a bevel gear mounted on the base The first motor on the bevel gear, and the rotating shaft of the bevel gear is connected to the output end of the first motor.

As a further solution of the present invention: the oil pump mechanism includes a pump body mounted on the base and a second motor mounted on the side of the pump body, the drive shaft of the pump body and the second motor The output end of the cylinder is connected, and its water inlet is communicated with the oil storage tank through a pipeline. The interior of the cylinder is provided with two cavities, the cavities and the first threaded oil cavity and the second threaded The oil cavity is communicated, the water outlet of the pump body is communicated with the cavity through a set of conducting structures, and the cavity is also connected with the oil storage tank through a set of conducting structures.

As a further solution of the present invention: the conducting structure includes a first collar and a second collar that are sleeved on the outer periphery of the cylinder, the interiors of the two are hollow, and the first collar and the second collar are hollow. The interiors of the two collars are hollow, and the inner walls of the two collars and the outer circumference of the cylinder are provided with through openings at equal distances along the circumference, and the first collar and the second collar are both sealed with the cylinder Rotationally connected, the first collar is connected to the water outlet of the pump body through a liquid inlet pipe, and the second collar is communicated with the oil storage tank through a one-way conducting structure.

As a further solution of the present invention: the discontinuous conduction structure includes a liquid outlet pipe fixedly installed on the base and communicated with the second collar and a one-way valve installed on the liquid outlet pipe, so The end of the liquid outlet pipe is communicated with the oil storage tank through a connecting pipe arranged in a "Y" shape.

As a further solution of the present invention, the adjustment mechanism includes a plurality of sets of sliding assemblies mounted on the rotary table and a self-locking assembly mounted on the boss, and the sliding assemblies are connected with the clamping member.

As a further solution of the present invention: the self-locking assembly includes a worm wheel and a worm screw that are rotatably mounted on the boss, and a disk that is fixedly mounted coaxially with the worm wheel, and one end of the worm screw is fixedly provided with a knob, And the worm gear and the worm are both engaged.

As a further solution of the present invention: the rotary table is provided with a plurality of chute equidistantly along the circumference, and the sliding assembly includes a sliding block which is slidably arranged in the chute and is fixedly connected with the clamping member, A fixing column fixedly arranged on the slider and a driving rod fixedly installed on the outer circumference of the disc, the driving rod is provided with a bar-shaped through groove, and the fixing column penetrates the bar-shaped through groove.

Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention has a novel design, and in the process of processing, two groups of oil pumping mechanisms work, and the oil storage tanks are pumped into the first threaded oil cavity respectively. Compared with the second threaded oil cavity, and because the threads of the first threaded oil cavity and the second threaded oil cavity are opposite to each other, a stable and high-strength bearing is formed between the static pressure friction pairs. At the same time, the outer circumference of the central shaft core is under force, in a suspended state, reducing friction, and the oil film in the two spiral oil cavity spirals has a stable effect on the central shaft core. The hydrostatic turntable has high practicability and stability, can effectively improve the machining accuracy of the final workpiece in actual workpiece machining, and is suitable for popularization and use.

Description of drawings

FIG. 1 is a schematic structural diagram of an embodiment of a double-spiral suspension type high-precision hydrostatic turntable.

FIG. 2 is a schematic structural diagram of another angle of an embodiment of a double-spiral suspension type high-precision hydrostatic turntable.

FIG. 3 is a schematic structural diagram of another angle of an embodiment of a double-spiral suspension type high-precision hydrostatic turntable.

FIG. 4 is a partial exploded schematic diagram of an embodiment of a double-spiral suspension type high-precision hydrostatic turntable.

FIG. 5 is a schematic structural diagram of FIG. 4 from another angle.

FIG. 6 is an enlarged view of the structure at A in FIG. 3 .

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

8 is a schematic exploded view of the structure of the adjustment mechanism in an embodiment of the double-spiral suspension type high-precision hydrostatic turntable.

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

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be 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 similar expressions used herein are for the purpose of illustration only and do not represent the only embodiment.

Referring to FIGS. 1-8 , in an embodiment of the present invention, a double-spiral suspension type high-precision hydrostatic turntable includes a base 1 , a cylinder 2 rotatably mounted on the base 1 , and a cylinder 2 fixed on the base 1 . The boss 3 on the base 1 is also installed with a power mechanism for driving the rotation of the cylinder 2;

Wherein, a protruding ring 4 and a protruding column 5 are fixedly arranged on the boss 3 , and two protruding rings 4 and the protruding column 5 are opened on the column body 2 for penetrating the protruding ring 4 and the protruding column 5 to be fixed therewith. The annular groove 6;

A first threaded groove 7 is formed on the outer circumference of the protruding column 5 , and a second threaded groove 8 is formed on the inner wall of one of the annular grooves 6 , and the first threaded groove 7 and the second threaded groove 8 are formed. In the first threaded 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 threaded groove 9 and a fourth threaded groove 10. The third threaded groove 9 and the The fourth threaded groove 10 forms a second threaded oil cavity, and the threads of the first threaded oil cavity and the second threaded oil cavity are opposite to each other, and an oil storage tank 19 is also installed on the base 1, so the The first threaded oil cavity and the second threaded oil cavity are each connected to the oil storage tank 19 through a set of oil pumping mechanisms;

A rotary table 21 for placing the workpiece is fixedly installed on the boss 3 through a plurality of support plates 33, and a plurality of clamping members 24 for clamping and fixing the workpiece are arranged on the rotary table 21 along the circumference. The clamping member 24 is arranged in an arc shape, and is connected with the adjusting mechanism installed on the boss 3 .

Wherein, it should be supplemented that the central axes of the rotary table 21 , the column body 2 and the boss 3 coincide with each other.

In the embodiment of the present invention, during use, the workpiece to be processed is placed on the rotary table 21, and then the adjustment mechanism works to drive the plurality of clamping members 24 to move linearly toward the center of the rotary table 21 at the same time, so that , and finally the clamping member 24 completes the clamping of the workpiece, which ensures that the workpiece rotates with the cylinder 2 , the boss 3 and the rotating table 21 synchronously when the power mechanism works, and at the same time greatly Improve the stability of the workpiece and ensure the subsequent machining accuracy;

In the process of processing, two sets of oil pumping mechanisms work, and the oil storage tank 19 is pumped into the first threaded oil cavity and the second threaded oil cavity respectively, and because the first threaded oil The thread rotation directions of the cavity and the second threaded oil cavity are opposite, so that a stable and high-strength bearing oil film is formed between the friction pairs in the static pressure state, and at the same time, the outer circumference of the central shaft is stressed, in a suspended state, and the friction is reduced. The oil film in the two helical oil cavity helixes has a stabilizing effect on the central shaft core.

To sum up, the static pressure turntable has high practicability and stability, can effectively improve the machining accuracy of the final workpiece in actual workpiece machining, and is suitable for popularization and use.

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

In the embodiment of the present invention, in actual use, after the clamping member 24 has completed clamping the workpiece, the first motor 18 starts to work and drives the bevel gear 17 to rotate, so that the bevel gear 17 passes through the bevel gear. The ring 16 drives the cylinder 2 to rotate, so that the workpiece rotates synchronously with the cylinder 2 , the boss 3 and the rotary table 21 , and the workpiece can be processed.

It should be noted that the first motor 18 is a servo motor whose output can be driven in both directions, and a 4IK/80YYJT motor can be selected. This type of motor has stable performance. There is no specific limitation in the application.

As an embodiment of the present invention, the oil pump mechanism includes a pump body 30 mounted on the base 1 and a second motor 31 mounted on the side of the pump body 30. The drive shaft of the pump body 30 It is connected to the output end of the second motor 31, and its water inlet is communicated with the oil storage tank 19 through a pipeline. The interior of the cylinder 2 is provided with two cavities, the cavities and the first The threaded oil cavity is communicated with the second threaded oil cavity, the water outlet of the pump body 30 is communicated with the cavity through a set of conducting structures, and the cavity is also connected with the oil storage through a set of conducting structures Tank 19 is connected.

Please refer to FIG. 4 and FIG. 5 again, the conduction structure includes a first collar 11 and a second collar 12 sleeved on the outer circumference of the cylinder 2 , the interiors of both are hollow, and the first collar 12 11 and the second collar 12 are hollow inside, and the inner walls of the two and the outer circumference of the cylinder 2 are provided with openings equidistantly along the circumference. The first collar 11 and the second collar The rings 12 are all connected with the cylinder body 2 in a sealing and rotation manner, the first collar 11 is connected to the water outlet of the pump body 30 through the liquid inlet pipe 14, and the second collar 12 is connected to the The oil storage tank 19 is communicated.

Please refer 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 collar 12 and a one-way valve installed on the liquid outlet pipe 15 13. The end of the liquid outlet pipe 15 communicates 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 pass through the liquid inlet pipe 14 and the liquid inlet pipe 14 respectively. The liquid outlet pipe 15 is fixed with the vertical plate.

In the embodiment of the present invention, when the second motor 31 is working, the pump body 30 pumps the oil in the oil storage tank 19 into the first collar 11 through the liquid inlet pipe 14 at its water outlet, and then the oil passes through the first collar 11. The openings on the inner wall of the ring 11 and the outer circumference of the cylinder 2 are filled into the first threaded oil cavity and the second threaded oil cavity, and the oil discharged from the first threaded oil cavity and the second threaded oil cavity passes through the second threaded oil cavity. The collar 12 , the liquid outlet pipe 15 and the connecting pipe 20 return to the oil storage tank 19 , so that the circulation of filling oil into the first threaded oil cavity and the second threaded oil cavity is realized. During the oil filling process, the filling directions of oil in the first threaded oil cavity and the second threaded oil cavity are opposite, so that a stable and high-strength bearing oil film is formed between the friction pairs under static pressure.

As an embodiment of the present invention, please refer to FIG. 6 and FIG. 8 again, the adjustment mechanism includes multiple sets of sliding components installed on the rotary table 21 and self-locking components installed on the boss 3 , The sliding assembly is connected with the clamping member 24 . The self-locking assembly includes a worm wheel 27 and a worm 28 that are rotatably mounted on the boss 3 and a disc 25 that is coaxially and fixedly installed with the worm wheel 27. One end of the worm 28 is fixedly provided with a knob 29, and The worm gear 27 and the worm 28 are both engaged.

The rotary table 21 is provided with a plurality of sliding grooves 32 equidistantly along the circumference. The sliding assembly includes a sliding block 22 slidably arranged in the sliding grooves 32 and fixedly connected with the clamping member 24 . The fixing column 23 on the slider 22 and the driving rod 26 fixedly installed on the outer circumference of the disc 25 are provided with a bar-shaped through groove, and the fixing column 23 penetrates the bar-shaped through slot.

In the embodiment of the present invention, when the workpiece is fixed, the work is placed on the rotary table 21, and then the worm 28 is rotated through the knob 29, so the worm 28 drives the worm wheel 27 and the disc 25 to rotate, and the disc 25 The driving rod 26 is driven to rotate, and correspondingly, the driving rod 26 drives the sliding block 22 to slide in the chute 32 toward the center of the rotary table 21 through the fixing column 23, so that the clamping member 24 fixes the workpiece. It has the characteristic of self-locking, thereby effectively ensuring the stability of the clamping piece 24 for fixing the workpiece, and providing guarantee for the machining accuracy of the final workpiece.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the invention is to be defined by the appended claims rather than the foregoing description, which are therefore intended to fall within the scope of the claims. All changes within the meaning and range of the equivalents of , are included in the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

In addition, it should be understood that although this specification is described in terms of embodiments, not each embodiment only includes an independent technical solution, and this description in the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole , the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims (8)

1. A double-spiral suspension type high-precision hydrostatic turntable, characterized in that it comprises a base (1), a cylinder (2) rotatably mounted on the base (1), and a cylinder (2) fixed on the cylinder (2). ) on the boss (3), and a power mechanism for driving the cylinder (2) to rotate is also installed on the base (1); Wherein, a protruding ring (4) and a protruding column (5) are fixedly arranged on the boss (3), and two are provided on the column (2) for the protruding ring (4) and the an annular groove (6) with which the protruding post (5) penetrates to be fixed; A first threaded groove (7) is formed on the outer periphery of the protruding column (5), and a second threaded groove (8) is formed on the inner wall of one of the annular grooves (6), and the first threaded groove (7) ) and the second threaded groove (8) to form a first threaded oil cavity, and a third threaded groove (9) is respectively opened on the outer wall of the protruding ring (4) and the inner wall of the other annular groove (6). ) and the fourth thread groove (10), the third thread groove (9) and the fourth thread groove (10) form a second thread oil cavity; The threads of the first threaded oil cavity and the second threaded oil cavity are in opposite directions, and an oil storage tank (19) is also installed on the base (1). The second threaded oil chambers are each connected with the oil storage tank (19) through a set of oil pumping mechanisms; A rotary table (21) for placing workpieces is fixedly installed on the boss (3) through a plurality of support plates (33), and a plurality of workpieces for clamping the workpiece are provided on the rotary table (21) along the circumference. A fixed clamping piece (24) is held, and the clamping piece (24) is arranged in an arc shape and is connected with an adjustment mechanism installed on the boss (3). 2. A double-spiral suspension type high-precision hydrostatic turntable according to claim 1, characterized in that the power mechanism comprises a bevel gear ring (16) fixedly mounted on the outer periphery of the cylinder (2) , Rotate the bevel gear (17) mounted on the base (1) and meshed with the bevel gear ring (16) and the first motor (18) mounted on the base (1), and the bevel gear (18) The rotating shaft of the gear (17) is connected to the output end of the first motor (18). 3. A double-spiral suspension type high-precision hydrostatic turntable according to claim 1, wherein the oil pump mechanism comprises a pump body (30) mounted on the base (1) and a pump body (30) mounted on the base (1). The second motor (31) on the side of the pump body (30), the drive shaft of the pump body (30) is connected to the output end of the second motor (31), and the water inlet of the pump body (30) is connected to the The oil storage tank (19) is connected; The inside of the cylinder (2) is provided with two cavities, the cavities communicate with the first threaded oil cavity and the second threaded oil cavity, and the water outlet of the pump body (30) passes through a The set of conducting structures is communicated with the cavity, and the cavity is also connected to the oil storage tank (19) through a set of conducting structures. 4. The double-spiral suspension type high-precision hydrostatic turntable according to claim 3, characterized in that the conducting structure comprises a first collar ( 11) and the second collar (12), the interiors of both are hollow, the interiors of the first collar (11) and the second collar (12) are hollow, and the inner walls of the two and the cylinder are (2) There are through openings on the outer circumference of the perimeter at equal distances along the circumference; Both the first ferrule (11) and the second ferrule (12) are connected with the cylinder (2) in a sealing and rotation manner, and the first ferrule (11) is connected to the cylinder (14) through a liquid inlet pipe (14). The water outlet of the pump body (30), the second collar (12) communicates with the oil storage tank (19) through a one-way conducting structure. 5. A double-spiral suspension type high-precision hydrostatic turntable according to claim 4, wherein the discontinuous conduction structure comprises a structure that is fixedly installed on the base (1) and is connected with the second set of The liquid outlet pipe (15) communicated with the ring (12) and the one-way valve (13) installed on the liquid outlet pipe (15), the end of the liquid outlet pipe (15) is arranged in a "Y" shape through the The connecting pipe (20) communicates with the oil storage tank (19). 6. A double-helix suspension type high-precision hydrostatic turntable according to claim 1, wherein the adjustment mechanism comprises multiple sets of sliding components installed on the turntable (21) and The self-locking assembly on the boss (3), the sliding assembly is connected with the clamping piece (24). 7 . The double-spiral suspension type high-precision hydrostatic turntable according to claim 6 , wherein the self-locking assembly comprises a worm wheel ( 27 ) and a worm screw rotatably mounted on the boss ( 3 ). 8 . (28) and a disk (25) 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) and the worm (28) The two mesh. 8. The double-spiral suspension type high-precision hydrostatic turntable according to claim 7, wherein a plurality of chutes (32) are provided on the turntable (21) equidistantly along the circumference. The sliding assembly comprises a sliding block (22) slidably arranged in the sliding groove (32) and fixedly connected with the clamping member (24), and a fixing column (23) fixedly arranged on the sliding block (22) and a drive rod (26) fixedly mounted on the outer circumference of the disc (25); The driving rod (26) is provided with a bar-shaped through slot, and the fixing column (23) penetrates the bar-shaped through slot.

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