Hydrostatic rotary table and machine tool

Abstract

The application discloses a kind of liquid static pressure rotary table and machine tool.The liquid static pressure rotary table includes rotary table main body and first throttle valve.Rotary table main body includes base, drive part and rotary table part, drive part is fixedly installed on base, rotary table part is installed on base and rotates under the drive of drive part, rotary table part has first static pressure cavity between base;First throttle valve includes valve seat, diaphragm and cover plate, cover plate is covered on valve seat, the side of valve seat close to cover plate is provided with cavity, the central part of cavity has throttling boss, throttling boss is provided with oil outlet hole on its axis, oil outlet hole extends to the bottom of base and is communicated with first static pressure cavity, diaphragm is arranged in cavity and is formed with pressure stabilizing chamber with base, diaphragm and cover plate form adjusting chamber, base is installed on rotary table main body.The liquid static pressure rotary table and machine tool of the application can at least solve the problem of poor rigidity of the liquid static pressure rotary table in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of processing equipment, in particular to a hydrostatic rotary table and machine tool. BACKGROUND

[0002] The hydrostatic rotary table is a high-precision, high-stability precision machine tool core component that provides support by using liquid static pressure to rotate. Through stable liquid flow, an oil film is formed between the rotary table and the support structure, so that the rotary table has extremely low friction and wear during rotation, thereby realizing high-precision motion control. Based on the superiority of the hydrostatic rotary table in all aspects, it plays an important role in many fields such as precision manufacturing, detection and measurement, large scientific equipment, and provides a reliable motion control solution for various high-precision rotary equipment.

[0003] At present, the commonly used hydrostatic rotary table mostly adopts constant pressure oil supply through small hole throttling or capillary throttling. Such throttling method cannot adjust the flow change according to the load change, so the thickness of the liquid support oil film in the hydrostatic cavity cannot be maintained unchanged. When the load becomes larger, the gap becomes smaller, and the stiffness of the hydrostatic rotary table is poor. SUMMARY

[0004] The main purpose of the present application is to provide a hydrostatic rotary table and machine tool to at least solve the problem of poor stiffness of the hydrostatic rotary table in the prior art.

[0005] According to one aspect of the present application, a hydrostatic rotary table is provided, comprising:

[0006] A rotary table body, the rotary table body comprising a base, a driving part and a rotary table part, the driving part being fixedly installed on the base, the rotary table part being installed on the base and rotating under the drive of the driving part, the rotary table part and the base having a first hydrostatic cavity therebetween;

[0007] The first throttle valve comprises a valve base, a diaphragm and a cover plate, the cover plate is arranged on the valve base, the valve base is provided with a cavity near one side of the cover plate, the cavity is provided with a throttling boss in the center, the throttling boss is provided with an oil outlet hole on the axis, the oil outlet hole extends to the bottom of the base and communicates with the first static pressure cavity, the diaphragm is arranged in the cavity and surrounds the base to form a pressure stabilizing cavity, the diaphragm and the cover plate surround to form an adjusting cavity, the base is installed on the rotary table body, the valve base is further provided with an oil inlet, a first annular flow channel, a second annular flow channel, a first throttling channel and a second throttling channel, the first annular flow channel and the second annular flow channel are both arranged at the bottom of the base, and the first annular flow channel surrounds the outer periphery of the second annular flow channel and is coaxially arranged with the second annular flow channel, the oil inlet communicates with the first annular flow channel, the two ends of the first throttling channel respectively communicate with the first annular flow channel and the pressure stabilizing cavity, the two ends of the second throttling channel respectively communicate with the first annular flow channel and the adjusting cavity, the oil outlet hole communicates with the second annular flow channel, and the second annular flow channel communicates with the first annular flow channel.

[0008] Further, the driving part comprises a driving motor, the driving motor comprises a stator, a rotor and a shaft core, the stator is fixed on the base, the rotor is rotatably installed in the interior of the stator, the shaft core is fixed in the rotor and extends in the direction perpendicular to the base, and the rotary table part is fixedly connected with the rotor and is sleeved on the shaft core.

[0009] Further, the liquid static pressure rotary table further comprises a fixing sleeve, the fixing sleeve is provided with a containing cavity, the driving part is fixedly installed in the containing cavity, and the fixing sleeve is fixedly installed on the base.

[0010] Further, the rotary table part comprises a rotary table body and a rotary table sleeve, the rotary table body is fixedly connected with the driving part, the rotary table sleeve is connected on the rotary table body and is sleeved on the outer periphery of the fixing sleeve, and the bottom of the rotary table sleeve and the base have the first static pressure cavity.

[0011] Further, the first static pressure cavity and the first throttle valve are both multiple, multiple first static pressure cavities are arranged in the circumferential direction of the rotary table sleeve, and multiple first throttle valves are arranged in one-to-one correspondence with multiple first static pressure cavities.

[0012] Further, the outer periphery of the fixing sleeve is sleeved with a conical block, the conical block is fixedly connected on the fixing sleeve, and the conical block has a first conical surface;

[0013] The conical block is at least partially located in the rotary table sleeve, and an inner wall surface of the rotary table sleeve is provided with a second conical surface matched with the first conical surface, and the first conical surface and the second conical surface have a second static pressure cavity therebetween.

[0014] The liquid static pressure rotary table further comprises a second throttle valve, a structure of the second throttle valve is consistent with that of the first throttle valve, and an oil outlet hole of the second throttle valve is in communication with the second static pressure cavity.

[0015] Further, the second static pressure cavity and the second throttle valve are both multiple, and multiple second static pressure cavities are arranged in a circumferential direction of the conical block.

[0016] Further, the liquid static pressure rotary table further comprises a dustproof component, the dustproof component is arranged on an outer periphery of the rotary table sleeve, and is used for preventing external dust from entering a gap between the rotary table sleeve and the base.

[0017] Further, the base is provided with an annular boss and a stop ring, the rotary table sleeve is located above the annular boss, the stop ring is arranged around an outer periphery of the annular boss, and a height of the stop ring is higher than that of the annular boss.

[0018] The dustproof component comprises a dustproof ring, the dustproof ring is fixedly sleeved on the rotary table sleeve, the dustproof ring has an annular enclosure protruding from a bottom surface of the rotary table sleeve, the annular enclosure is sleeved around an outer periphery of the stop ring, and a bottom surface of the annular enclosure is lower than a top surface of the annular boss.

[0019] In another aspect, the application further provides a machine tool, the machine tool comprising the above liquid static pressure rotary table.

[0020] In the present application, the first throttle valve is a feedback type throttle valve. In actual operation, oil enters from the oil inlet, one way into the first annular flow channel, from the first annular flow channel into the pressure stabilizing chamber and through the second annular flow channel into the oil outlet hole, and the oil flowing out of the oil outlet hole is supplied to the first static pressure chamber together with the main oil path on the rotary table body; the other way is from the first annular flow channel through the second throttle channel into the adjusting chamber. When no other load is arranged on the rotary table part, the pressure Pr of the oil outlet hole is relatively small, the oil pressure in the pressure stabilizing chamber is less than the oil pressure in the adjusting chamber, the diaphragm is bent and deformed downward under pressure, the gap between the throttle boss and the diaphragm is 0, and the flow of the oil outlet hole is minimum. When a load is arranged on the rotary table part, the oil pressure in the first static pressure chamber and the main oil path rises under the pressure applied by the load, the oil pressure in the pressure stabilizing chamber rises correspondingly, the pressure in the adjusting chamber is less than the pressure in the pressure stabilizing chamber, the original balance of the first throttle valve is broken, the diaphragm bends towards the direction of the cover plate, the gap between the diaphragm and the throttle boss becomes larger, and the hydraulic oil in the pressure stabilizing chamber can flow into the oil outlet hole through the gap between the throttle boss and the diaphragm, and then flow into the first static pressure chamber together with the oil in the main oil path of the rotary table body, thereby realizing feedback type adjustment.

[0021] That is to say, when the load pressure on the rotary table part changes, the diaphragm will deform correspondingly under the action of force, the volume of the pressure stabilizing chamber changes with the deformation of the diaphragm, thereby playing a role in controlling the flow of the oil outlet hole, and the greater the load pressure, the greater the flow, so that the oil film thickness changes very little, has higher oil film rigidity, and thereby ensures that the hydrostatic rotary table connected with the first throttle valve has high motion precision requirements. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The illustrative embodiments of the present application and their descriptions serve to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0023] Figure 1 The front view of the hydrostatic rotary table disclosed in the embodiments of the present application;

[0024] Figure 2 The sectional view of the hydrostatic rotary table disclosed in the embodiments of the present application;

[0025] Figure 3 The enlarged view of the I area of Figure 2

[0026] Figure 4 The perspective structure view of the conical block disclosed in the embodiments of the present application;

[0027] Figure 5 The perspective structure view of the base disclosed in the embodiments of the present application;

[0028] Figure 6 ​A perspective view of the first throttle valve or the second throttle valve disclosed in the embodiments of the present application is shown in FIG. 1.

[0029] Figure 7 An exploded view of the first throttle valve or the second throttle valve disclosed in the embodiments of the present application is shown in FIG. 2.

[0030] Figure 8 A sectional view of the first throttle valve or the second throttle valve disclosed in the embodiments of the present application is shown in FIG. 3.

[0031] Figure 9 A top view of the valve seat disclosed in the embodiments of the present application is shown in FIG. 4.

[0032] Figure 10 A bottom view of the cover plate disclosed in the embodiments of the present application is shown in FIG. 5.

[0033] In the above drawings, the following reference signs are used:

[0034] 10, turntable body; 11, base; 111, annular boss; 112, stop ring; 12, driving part; 121, stator; 122, rotor; 123, shaft core; 13, turntable part; 131, turntable body; 132, turntable sleeve; 1321, second taper surface; 101, first static pressure cavity; 14, fixed sleeve; 141, accommodating cavity; 15, tapered block; 151, first taper surface; 102, second static pressure cavity; 20, first throttle valve; 21, valve seat; 211, cavity; 212, throttling boss; 213, oil outlet hole; 214, first annular flow channel; 215, second annular flow channel; 216, first throttling channel; 217, second throttling channel; 218, oil inlet; 201, pressure stabilizing cavity; 202, adjusting cavity; 22, cover plate; 221, protrusion; 222, groove; 23, diaphragm; 24, bolt; 25, sealing ring; 30, second throttle valve; 40, dustproof part; 41, dustproof ring; 411, annular barrier; 50, circular grating. DETAILED DESCRIPTION

[0035] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0036] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that the terms "comprise" and / or "include" as used in the specification indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0037] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples herein are not intended to limit the scope of the application unless specifically so stated. It is to be understood that the actual dimensions of the various parts shown in the drawings are not necessarily to scale, and that the dimensions can be arbitrarily set forth for the clarity of presentation and because it is the intent of the inventor to provide the best mode of the application. Technical, method and device descriptions known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the disclosure where appropriate. In all of the examples shown and discussed herein, any specific values are to be interpreted as merely exemplary and not as a limitation on the scope of the exemplary embodiments. Thus, other examples of the exemplary embodiments can have different values. It is to be noted that like numbers and letters refer to like elements throughout the several views of the drawings and that the drawings are not necessarily to scale as the emphasis is generally upon the functional teaching rather than the precise dimensions thereof.

[0038] Referring to Figures 1 to 10 As shown, according to the embodiments of the present application, a hydrostatic rotary table is provided. The hydrostatic rotary table comprises a rotary table body 131 and a first throttle valve 20.

[0039] The rotary table body 131 comprises a base 11, a driving part 12 fixedly installed on the base 11, and a rotary table part 13 installed on the base 11 and rotating under the driving of the driving part 12, and the rotary table part 13 has a first static pressure cavity 101 with the base 11. The first throttle valve 20 comprises a valve seat 21, a diaphragm 23, and a cover plate 22, the cover plate 22 is covered on the valve seat 21, the base 11 has a cavity 211 on the side close to the cover plate 22, the cavity 211 has a throttling boss 212 in the center, the throttling boss 212 has an oil outlet hole 213 on the axis, the oil outlet hole 213 extends to the bottom of the valve seat 21 and communicates with the first static pressure cavity 101, the diaphragm 23 is arranged in the cavity 211 and forms a pressure stabilizing cavity 201 with the base 11, the diaphragm 23 and the cover plate 22 form an adjusting cavity 202, the base 11 is installed on the rotary table body 131, the valve seat 21 is provided with an oil inlet 218, a first annular flow channel 214, a second annular flow channel 215, a first throttling channel 216, and a second throttling channel 217, the first annular flow channel 214 is located on the outer periphery of the second annular flow channel 215 and is coaxially arranged with the second annular flow channel 215, the oil inlet 218 communicates with the first annular flow channel 214, the two ends of the first throttling channel 216 respectively communicate with the first annular flow channel 214 and the pressure stabilizing cavity 201, the two ends of the second throttling channel 217 respectively communicate with the first annular flow channel 214 and the adjusting cavity 202, the oil outlet hole 213 communicates with the second annular flow channel 215, and the second annular flow channel 215 communicates with the first annular flow channel 214.

[0040] When the liquid static pressure turntable in the embodiment works, the driving part 12 rotates, and the turntable part 13 can be driven to rotate on the base 11. Since the turntable part 13 in the embodiment has the first static pressure cavity 101 between the base 11 and the turntable part 13, the hydraulic oil can be introduced into the first static pressure cavity 101 through the first throttling valve 20. At this time, the base 11 and the turntable part 13 have the oil film, which can make the turntable part 13 have very low friction and wear during rotation, so as to facilitate the high-precision operation control of the liquid static pressure turntable.

[0041] In the embodiment, the first throttling valve 20 is a feedback type throttling valve. In actual work, the oil liquid enters from the oil inlet 218 and then enters the first annular flow channel 214. From the first annular flow channel 214, the oil liquid enters the pressure stabilizing cavity 201 and enters the oil outlet hole 213 through the second annular flow channel 215. The oil liquid flowing out of the oil outlet hole 213 is supplied to the first static pressure cavity 101 together with the main oil way on the turntable main body 131. The other way is that the oil liquid enters the adjusting cavity 202 from the first annular flow channel 214 through the second throttling channel 217. When no other load is arranged on the turntable part 13, the pressure Pr of the oil outlet hole 213 is relatively small, the oil pressure in the pressure stabilizing cavity 201 is less than the oil pressure in the adjusting cavity 202, the diaphragm 23 is bent and deformed downward under pressure, the gap between the throttling boss 212 and the diaphragm 23 is 0, and the flow of the oil outlet hole 213 is minimum. When the load is arranged on the turntable part 13, the oil pressure in the first static pressure cavity 101 and the oil pressure on the main oil way are increased due to the pressure applied by the load. The oil in the pressure stabilizing cavity 201 is correspondingly increased, the pressure of the adjusting cavity 202 is less than the pressure of the pressure stabilizing cavity 201, the original balance of the first throttling valve 20 is broken, the diaphragm 23 is bent towards the cover plate 22, the gap between the diaphragm 23 and the throttling boss 212 is increased, the hydraulic oil in the pressure stabilizing cavity 201 can flow into the oil outlet hole 213 through the gap between the throttling boss 212 and the diaphragm 23, and then flow into the first static pressure cavity 101 together with the oil liquid on the main oil way of the turntable main body 10, thereby realizing feedback type adjustment.

[0042] That is to say, when the load pressure on the turntable part 13 changes, the diaphragm 23 will deform correspondingly under the action of force, the volume of the pressure stabilizing cavity 201 changes with the deformation of the diaphragm 23, thereby playing a role in controlling the flow of the oil outlet hole 213. The greater the load pressure, the greater the flow, so that the thickness of the oil film changes very little, has higher oil film rigidity, and further ensures that the liquid static pressure turntable connected with the first throttling valve has high motion precision requirements.

[0043] Further, the cover plate 22 in the embodiment is provided with a protrusion 221 close to one end of the valve seat 21, the protrusion 221 is inserted into the cavity 211, the bottom surface of the protrusion 221 is provided with a spiral groove 222, when the oil enters from the second throttling channel 217, it will flow along the spiral groove 222, optionally, the center of the spiral groove 222 in the embodiment is located on the axis of the throttling boss 212, when the oil enters the spiral groove 222, it is convenient to exert pressure on the diaphragm 23. The diaphragm 23 in the embodiment can be a metal sheet or the like structure. Further, the driving part 12 in the embodiment includes a driving motor, the driving motor includes a stator 121, a rotor 122 and a shaft core 123. The stator 121 is fixed on the base 11, the rotor 122 is rotatably installed in the stator 121, the shaft core 123 is fixed in the rotor 122 and extends in a direction perpendicular to the base 11, and the rotating table part 13 is fixedly connected with the rotor 122 and is sleeved on the shaft core 123. In this way, when the driving motor is powered, the rotor 122 rotates, which can drive the shaft core 123 and the rotating table part 13 to rotate. Optionally, the rotor 122 and the rotating table part 13 in the embodiment are fixedly connected by bolts, which is simple in structure and stable and reliable.

[0044] The cover plate 22 and the valve seat 21 in the embodiment are fixedly connected by bolts 24, and a sealing ring 25 is arranged between the cover plate 22 and the valve seat 21, so as to seal the gap between the cover plate 22 and the valve seat 21 and prevent hydraulic oil from leaking.

[0045] In order to improve the structural stability and motion reliability of the hydrostatic pressure rotating table in the embodiment, the hydrostatic pressure rotating table in the embodiment further includes a fixing sleeve 14, the fixing sleeve 14 is provided with a containing cavity 141, and in actual installation, the driving part 12 is fixedly installed in the containing cavity 141, and the fixing sleeve 14 is fixedly installed on the base 11. Specifically, the fixing sleeve 14 can be fixedly installed on the base 11 by screwing or welding, and the driving part 12, i.e. the stator 121 of the driving motor, is fixed on the fixing sleeve 14 by screws or the like structure, which is stable and reliable in structure.

[0046] Further, the rotating table part 13 in the embodiment includes a rotating table main body 131 and a rotating table sleeve 132, the rotating table main body 131 is fixedly connected with the driving part 12, and the rotating table sleeve 132 is sleeved on the outer periphery of the fixing sleeve 14, and the bottom of the rotating table sleeve 132 has the first static pressure cavity 101 described above between the bottom and the base 11. By arranging the rotating table part 13 into two parts of the rotating table main body 131 and the rotating table sleeve 132, it is not only convenient for processing, but also convenient for assembling the hydrostatic pressure rotating table.

[0047] In actual processing, the first static pressure cavity 101 can be processed on the bottom surface of the rotary table sleeve 132 or on the base 11. The structure when the first static pressure cavity 101 is arranged on the base 11 is shown in the drawings of the present application. In the embodiment, the first static pressure cavity 101 is arranged on the base 11, and the first throttle valve 20 is installed on the base 11, which facilitates the modular design of the oil circuit and the oil supply of the hydrostatic state.

[0048] Optionally, the first static pressure cavity 101 and the first throttle valve 20 in the embodiment are multiple, the multiple first static pressure cavities 101 are arranged along the circumference of the rotary table sleeve 132, and the multiple first throttle valves 20 are arranged in one-to-one correspondence with the multiple first static pressure cavities 101. For example, the first static pressure cavity 101 and the first throttle valve 20 in the embodiment can be two, three or more. The case where the first static pressure cavity 101 is arranged as four is shown in the drawings of the present application. The multiple first static pressure cavities 101 are arranged along the circumference of the rotary table sleeve 132, and the corresponding first throttle valve 20 cooperates to feedback-regulate the pressure of the oil in the first static pressure cavity 101, thereby stably supporting the rotary table sleeve 132.

[0049] Further, the outer periphery of the fixed sleeve 14 is sleeved with a tapered block 15, which is fixedly connected to the fixed sleeve 14. After installation, the tapered tip of the tapered block 15 is arranged downward. The tapered block 15 has a first tapered surface 151, and the tapered block 15 is at least partially located in the rotary table sleeve 132. The inner wall surface of the rotary table sleeve 132 is provided with a second tapered surface 1321 matched with the first tapered surface 151, and the first tapered surface 151 and the second tapered surface 1321 have a second static pressure cavity 102. The liquid hydrostatic rotary table further comprises a second throttle valve 30, which has the same structure as the first throttle valve 20, and the oil outlet hole 213 of the second throttle valve 30 is in communication with the second static pressure cavity 102. Since the first tapered surface 151 and the second tapered surface 1321 in the embodiment have the second static pressure cavity 102, and the structure of the second throttle valve 30 is the same as that of the first throttle valve 20, the second throttle valve 30 is fixedly installed on the base 11 in actual installation.

[0050] After the oil enters the oil inlet 218 of the second throttle valve 30, it enters the first annular flow channel 214, enters the pressure stabilizing cavity 201 from the first annular flow channel 214, and enters the oil outlet hole 213 through the second annular flow channel 215. The oil outlet hole 213 supplies oil to the first static pressure cavity 101 together with the main oil passage of the turntable body 131. The other way is that the oil enters the adjusting cavity 202 from the first annular flow channel 214 through the second throttle channel 217. When no other load is arranged on the turntable part 13, the pressure Pr of the oil outlet hole 213 is relatively small, the oil pressure in the pressure stabilizing cavity 201 is less than the oil pressure in the adjusting cavity 202, the diaphragm 23 is bent and deformed downward under pressure, the gap between the throttle boss 212 and the diaphragm 23 is 0, and the flow of the oil outlet hole 213 is minimum. When a load is arranged on the turntable part 13, the oil pressure in the second static pressure cavity 102 and the main oil passage rises under the pressure applied by the load, the oil pressure in the pressure stabilizing cavity 201 rises correspondingly, the pressure of the adjusting cavity 202 is less than the pressure of the pressure stabilizing cavity 201, the original balance of the second throttle valve 30 is broken, the diaphragm 23 bends towards the direction of the cover plate 22, the gap between the diaphragm 23 and the throttle boss 212 becomes larger, and the hydraulic oil in the pressure stabilizing cavity 201 can flow into the oil outlet hole 213 through the gap between the throttle boss 212 and the diaphragm 23, and then enter the second static pressure cavity 102 together with the main oil passage of the turntable body 10.

[0051] In order to deliver oil to the first static pressure cavity 101 and the second static pressure cavity 102, the base 11, the fixed sleeve 14 and the tapered block 15 in the embodiment are all provided with an oil passage, which can be processed and designed according to actual oil supply requirements, and specific introduction is not made in the embodiment.

[0052] It should be noted that when the hydrostatic rotary table is installed, the coaxiality requirements of the conical block 15, the fixed sleeve 14 and the rotary table sleeve 132 need to be ensured, and the coaxiality is usually required to be less than or equal to 3 μm; after the conical block 15 and the rotary table sleeve 132 are matched, the second static pressure cavity 102 is formed, and after the hydraulic oil is introduced, the oblique force can be generated, which can be decomposed in the horizontal and vertical directions, and is used to provide the vertical downward preloading force and the horizontal outward component force, and the horizontal outward component force can ensure that the rotary table part 13 bears the radial force of 2000 N (in actual use, the carrying capacity of the rotary table part 13 can be adjusted by matching the pressure flow characteristics of the second static pressure cavity 102 and the second throttle valve 30); after the rotary table sleeve 132 and the base 11 are matched, the first static pressure cavity 101 is formed, and after the hydraulic oil is introduced, the vertical upward lifting force can be generated, which is used to support the machining parts on the rotary table part 13, and the lifting force is usually 16000 N. Among them, the vertical downward preloading force generated by the second static pressure cavity 102 and the lifting force generated by the first static pressure cavity 101 realize a closed structure between the rotary table static pressure cavities, and compared with an open structure, the oil film stiffness is greatly improved. At the same time, the horizontal outward component force generated by the second static pressure cavity 102 in the embodiment and the lifting force generated by the first static pressure cavity 101 realize that the rotary table can bear a larger overturning moment, and at the same time, the overturning stiffness is high and the structure is stable and reliable due to the stiffness of the oil film.

[0053] Further, the second static pressure cavities 102 and the second throttle valves 30 are both multiple, and the multiple second static pressure cavities 102 are arranged along the circumferential direction of the conical block 15. For example, the second static pressure cavities 102 and the second throttle valves 30 in the embodiment can be provided as two, three or more than three, and the case where the second static pressure cavities 102 are four is shown in the drawings of the application. The embodiment can stably support the rotary table sleeve 132 by arranging multiple second static pressure cavities 102 along the circumference of the conical block 15 and cooperating with the corresponding second throttle valves 30 to feedback adjust the pressure of the oil in the second static pressure cavities 102.

[0054] Referring to Figures 1 to 5As shown, the liquid static pressure turntable in the embodiment further comprises a dustproof component 40 arranged on the outer periphery of the turntable sleeve 132 for preventing external dust from entering the gap between the turntable sleeve 132 and the base 11. Optionally, the base 11 is provided with an annular boss 111 and a stop ring 112, the turntable sleeve 132 is located above the annular boss 111, the stop ring 112 is fixed on the base 11 by screws or the like and surrounds the outer periphery of the annular boss 111, and the height of the stop ring 112 is higher than the height of the annular boss 111. The dustproof component 40 comprises a dustproof ring 41 fixedly sleeved on the turntable sleeve 132, the dustproof ring 41 has an annular enclosure 411 protruding from the bottom surface of the turntable sleeve 132, the annular enclosure 411 is sleeved on the outer periphery of the stop ring 112, and the bottom surface of the annular enclosure 411 is lower than the top surface of the annular boss 111. According to the above structure, it can be known that, in the embodiment, by making the height of the stop ring 112 higher than the height of the annular boss 111, the stop ring 112 can seal the gap between the annular boss 111 and the turntable sleeve 132 in the first way, and at the same time, by making the bottom surface of the annular enclosure 411 lower than the top surface of the annular boss 111, the gap between the annular boss 111 and the turntable sleeve 132 can be sealed in the second way, at this time, the stop ring 112 and the annular enclosure 411 can form a labyrinth ring, the design of which can avoid dust and the like outside the static pressure turntable from entering the oil return groove, thereby ensuring the quality of the hydraulic oil. After assembly, the entire main structure of the liquid static pressure turntable is wrapped in the inner wall of the turntable sleeve 132, which is compact in structure and strong in anti-pollution ability.

[0055] When the static pressure turntable works, the hydraulic oil enters the four first throttles 20 and the four second throttles 30, and then flows into the four directions of the first static pressure cavity 101 and the second static pressure cavity 102, respectively, to float the shaft core 123 and the turntable part 13, and form an oil film of 0.02-0.03 mm in the axial and oblique directions. The existence of the oil film ensures that the friction resistance is extremely small when the turntable part 13 rotates, and the friction coefficient is about 0.005, and at the same time, the anti-vibration performance is excellent. When a load is borne, whether the thickness of the oil film changes directly determines the rigidity of the liquid static pressure turntable, and further affects the accuracy of the turntable. The liquid static pressure turntable of the application is provided with the first throttles 20 and the second throttles 30, and the self-adaptive compensation characteristics of the first throttles 20 and the second throttles 30 can ensure that the oil film basically does not change. After the oil is passed, the driving motor of the liquid static pressure turntable is powered on to start working, and drives the turntable part 13 to perform rotational movement. The turntable completes positioning work by relying on the circular grating 50. After reaching the position, the first throttle 20 stops oil supply, and the second throttle 30 continues to supply oil. At this time, the lifting force generated by the first static pressure cavity 101 disappears, and the oblique force generated by the second static pressure cavity 102 acts on the base 11 in the vertical direction, so that the brake of the liquid static pressure turntable is realized.

[0056] According to the above description, it can be known that the main working principle of the hydrostatic rotary table in the embodiment is to utilize the pressure difference between the pump pressure of the hydraulic station and the oil cavity of the hydrostatic rotary table when the load changes, convert the change of the pressure difference into the elastic deformation of the diaphragm, and then realize the control of the throttling gap and the change of the liquid resistance of the throttler, further increase the pressure difference balance of the oil cavity to bear the load, and make the rotary table have a tendency to restore to the initial position. At the same time, the flow of the rotary table oil cavity and the pressure are in a proportional relationship, that is, the oil film thickness basically remains unchanged with the change of the external load, so that the supporting oil film has high stiffness, thereby ensuring the precision machining effect of the hydrostatic rotary table. At the same time, the first throttling valve and the second throttling valve in the embodiment have the advantages of compact and simple structure, self-adaptive feedback, etc., and the hydrostatic rotary table based on the throttler has the advantages of long service life, wide speed range, good anti-vibration performance, high rotary table rotation accuracy, good adaptability, etc., and can be widely applied to the field of ultra-precision machine tool machining.

[0057] The hydrostatic rotary table in the embodiment adopts a flat and tapered structure, and has certain advantages in load bearing capacity, torsional capacity, stability, self-centering capacity, anti-pollution capacity and service life compared with a full flat hydrostatic rotary table.

[0058] On the other hand, the application also discloses a machine tool, which comprises the above-mentioned hydrostatic rotary table. Therefore, the machine tool comprises all the technical effects of the hydrostatic rotary table in the above-mentioned embodiment, and the technical effects of the hydrostatic rotary table in the application have been described in detail in the foregoing, which will not be described here. In order to facilitate the description, spatial relative terms such as "on", "above", "upper surface", "upper" and the like can be used to describe the spatial positional relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "on" other devices or structures will be positioned "below" or "under" other devices or structures. Therefore, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated by 90 degrees or in other orientations), and the spatial relative description used herein is interpreted accordingly.

[0059] In addition, it should be noted that the use of "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above terms have no special meaning unless otherwise stated, and therefore cannot be understood as a limitation on the protection scope of the application.

[0060] The above merely describes the preferred embodiments of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A hydrostatic rotary table, characterized in that, The utility model relates to a rotary table, including: Rotary table main body (131), rotary table main body (131) includes base (11), drive part (12) and rotary table part (13), drive part (12) is fixedly installed on base (11), rotary table part (13) is installed on base (11) and rotates under the drive of drive part (12), rotary table part (13) with first static pressure cavity (101) between base (11); First throttling valve (20), first throttling valve (20) includes valve seat (21), diaphragm (23) and cover plate (22), cover plate (22) is covered on valve seat (21), valve seat (21) is provided with cavity (211) on the side close to cover plate (22), the central part of cavity (211) has throttling boss (212), throttling boss (212) is provided with oil outlet hole (213) on the axis, oil outlet hole (213) extends to the bottom of base (11) and communicates with first static pressure cavity (101), diaphragm (23) is arranged in cavity (211) and is surrounded with base (11) and forms pressure stabilization chamber (201), diaphragm (23) and cover plate (22) are surrounded and form adjusting chamber (202), base (11) is installed on rotary table main body (131), valve seat (21) is also provided with oil inlet (218), first annular flow channel (214), second annular flow channel (215), first throttling channel (216) and second throttling channel (217), first annular flow channel (214) and second annular flow channel (215) are all arranged at the bottom of base (11), and first annular flow channel (214) is surrounded at the outer periphery of second annular flow channel (215) and is coaxially arranged with second annular flow channel (215), oil inlet (218) communicates with first annular flow channel (214), both ends of first throttling channel (216) communicate with first annular flow channel (214) and pressure stabilization chamber (201) respectively, both ends of second throttling channel (217) communicate with first annular flow channel (214) and adjusting chamber (202) respectively, oil outlet hole (213) communicates with second annular flow channel (215), second annular flow channel (215) communicates with first annular flow channel (214).

2. Hydrostatic turntable according to claim 1, characterized in that Drive part (12) includes drive motor, drive motor includes stator (121), rotor (122) and shaft core (123), stator (121) is fixed on base (11), rotor (122) is rotatably installed in the inside of stator (121), shaft core (123) is fixed in rotor (122) and extends along the direction perpendicular to base (11), rotary table part (13) is fixedly connected with rotor (122) and is sleeved on shaft core (123).

3. The hydrostatic turntable of claim 1, wherein, The liquid static pressure turntable further comprises a fixed sleeve (14) provided with a containing cavity (141) inside, and the driving part (12) is fixedly installed in the containing cavity (141), and the fixed sleeve (14) is fixedly installed on the base (11).

4. Hydrostatic turntable according to claim 3, characterized in that The turntable part (13) comprises a turntable main body (131) and a turntable sleeve (132), the turntable main body (131) is fixedly connected with the driving part (12), the turntable sleeve (132) is connected on the turntable main body (131) and is sleeved on the outer periphery of the fixed sleeve (14), and the bottom of the turntable sleeve (132) is provided with the first static pressure cavity (101) with the base (11).

5. Hydrostatic turntable according to claim 4, characterized in that The first static pressure cavity (101) and the first throttle valve (20) are both provided in plurality, the plurality of first static pressure cavities (101) are arranged in the circumferential direction of the turntable sleeve (132), and the plurality of first throttle valves (20) are arranged in one-to-one correspondence with the plurality of first static pressure cavities (101).

6. The hydrostatic turntable according to claim 4, characterized in that The outer periphery of the fixed sleeve (14) is sleeved with a tapered block (15), the tapered block (15) is fixedly connected on the fixed sleeve (14), and the tapered block (15) is provided with a first tapered surface (151) thereon; The tapered block (15) is at least partially located in the turntable sleeve (132), and the inner wall surface of the turntable sleeve (132) is provided with a second tapered surface (1321) matched with the first tapered surface (151), and the first tapered surface (151) and the second tapered surface (1321) are provided with a second static pressure cavity (102) therebetween; The liquid static pressure turntable further comprises a second throttle valve (30), the structure of the second throttle valve (30) is consistent with that of the first throttle valve (20), and the oil outlet hole (213) of the second throttle valve (30) is in communication with the second static pressure cavity (102).

7. Hydrostatic rotary table according to claim 6, characterized in that The second static pressure cavity (102) and the second throttle valve (30) are both provided in plurality, and the plurality of second static pressure cavities (102) are arranged in the circumferential direction of the tapered block (15).

8. The hydrostatic turntable of claim 4, wherein, The liquid static pressure turntable further comprises a dustproof component (40), the dustproof component (40) is arranged on the outer periphery of the turntable sleeve (132) to prevent external dust from entering the gap between the turntable sleeve (132) and the base (11).

9. Hydrostatic rotary table according to claim 8, characterized in that The base (11) is provided with an annular boss (111) and a stop ring (112), the turntable sleeve (132) is located above the annular boss (111), the stop ring (112) is arranged around the outer periphery of the annular boss (111), and the height of the stop ring (112) is higher than that of the annular boss (111); The dustproof component (40) comprises a dustproof ring (41) fixedly sleeved on the rotary table sleeve (132), the dustproof ring (41) has an annular fence (411) protruding from the bottom surface of the rotary table sleeve (132), the annular fence (411) is sleeved on the outer periphery of the stop ring (112), and the bottom surface of the annular fence (411) is lower than the top surface of the annular boss (111).

10. A machine tool, characterized by The machine tool comprises the hydrostatic rotary table according to any one of claims 1 to 9.

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