Hydrostatic rotary table and machine tool

Abstract

The application provides a hydrostatic rotary table and machine tool, which is provided with an oil guide mechanism, a driving mechanism, a grating mechanism and a rotary table assembly. When the hydrostatic rotary table is operated, a hydraulic pump continuously delivers oil to the contact surface between the rotary table and the supporting table through the oil guide mechanism, so that the contact surface, the gasket and the gasket washer generate an oil film. The surface contact between the rotary table and the supporting table better ensures the horizontal stability of the rotary table, the oil film makes the rotary table in a micro-floating state, and the gasket washer greatly reduces the horizontal vibration, thereby ensuring the rotation accuracy of the rotary table.

Description

TECHNICAL FIELD

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

[0002] At present, lathes, grinding machines, four-axis machine tools, five-axis machine tools and the like with rotating shafts are provided with servo rotary table technology, which is widely used in various fields of the ultra-precision numerical control machine tool industry. The precision of the rotation of the rotary table determines the precision grade of the machine tool to a certain extent. At present, the ultra-precision servo rotary table supported by the hydrostatic guide rail generally uses rolling bearing support, and the rotation precision is limited. Long-time operation of the rolling body and the bearing raceway friction can easily produce vibration and easily wear, and the precision will be reduced after a period of use. SUMMARY

[0003] Therefore, the present application aims to provide a hydrostatic rotary table and a machine tool to solve the above problems.

[0004] The present application adopts the following scheme:

[0005] The present application provides a hydrostatic rotary table, which comprises an oil guiding mechanism, a driving mechanism, a grating mechanism and a rotary table assembly. The oil guiding mechanism comprises a bottom disc, an oil tank arranged on the bottom disc, a hydraulic pump arranged in the oil tank, and a plurality of oil guiding assemblies connected to the upper end surface of the oil tank and arranged uniformly along the axis of the oil tank. The rotary table assembly comprises a rotary table and a support table arranged below the rotary table. The upper end surface of the support table is provided with a plurality of first placing grooves and a plurality of second placing grooves corresponding to the oil guiding assemblies and communicating with the oil guiding assemblies. A gasket is arranged on the first placing grooves, and a gasket is arranged on the second placing grooves. The axis of the support table is provided with a through hole, and the lower end surface of the support table is provided with at least one limiting wall. The grating mechanism is arranged on the upper end surface of the oil tank, and the upper end surface of the oil tank is provided with a limiting groove matched with the limiting wall. The driving mechanism is arranged at the axis of the upper end surface of the oil tank and connected to the rotary table through the through hole. The hydraulic pump is used for transmitting oil, and the outer surfaces of the gasket and the gasket and / or the contact surfaces between the rotary table and the support table form an oil film through the oil guiding assemblies.

[0006] Further, the oil guiding assembly comprises a bellows, a silica gel hose and a semicircular cavity plate. One end of the bellows is connected to the upper end surface of the oil tank, and the other end is connected to the silica gel hose. The top end of the silica gel hose is connected to the semicircular cavity plate, and the bottom end of the semicircular cavity plate is in communication with the silica gel hose.

[0007] Further, the gasket comprises a first gasket and a second gasket; the first gasket is connected to the turntable and is arranged in the second placing groove, and the bottom of the first gasket is provided with a protrusion; the upper end surface of the second gasket is provided with a groove matched with the protrusion, and a plurality of oil guide holes are arranged on the second gasket along the axial direction of the second gasket; the oil guide holes are communicated with the oil guide assembly.

[0008] Further, the driving mechanism comprises a protective shell, a DC motor stator and a DC motor rotor; the upper end surface of the oil tank is rotatably provided with a mounting shaft at the axial center; the DC motor rotor is fixedly arranged on the mounting shaft; the DC motor stator is arranged outside the DC motor rotor; and the protective shell is arranged outside the DC motor stator.

[0009] Further, the shaft cylinder mechanism comprises a lower shaft cylinder connected to the upper end of the mounting shaft and an upper shaft cylinder connected to the turntable; the upper shaft cylinder is fixedly provided with a slot round block inside; the lower shaft cylinder is provided with a plug ring plate embedded with the slot round block; and the outer sides of the lower shaft cylinder and the upper shaft cylinder are both provided with connecting portions connected by a connecting plug rod.

[0010] A machine tool comprising the hydrostatic turntable.

[0011] By adopting the above technical scheme, the following technical effects can be achieved.

[0012] The hydrostatic turntable provided by the application is provided with an oil guide mechanism, a driving mechanism, a grating mechanism and a turntable assembly, when the hydrostatic turntable is operated, the hydraulic pump continuously delivers oil to the contact surface between the turntable and the supporting table through the oil guide mechanism, so that the contact surface, the gasket and the grommet generate an oil film; the surface contact between the turntable and the supporting table better guarantees the horizontal stability of the turntable, and the oil film makes the turntable in a micro-floating state, which guarantees smooth rotation of the turntable; and the gasket and the grommet greatly reduce the horizontal vibration, thereby guaranteeing the rotation accuracy of the turntable. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor.

[0014] Figure 1 Fig. 1 is a partial cross-sectional structure schematic diagram of a hydrostatic turntable according to an embodiment of the application;

[0015] Figure 2It is a liquid static pressure rotary table partial assembly structure schematic diagram of the embodiment of the application;

[0016] Figure 3 It is Figure 2 The enlarged structure schematic diagram of A in the figure;

[0017] Figure 4 It is a structure schematic diagram of a liquid static pressure rotary table driving mechanism of the embodiment of the application;

[0018] Figure 5 It is Figure 1 The enlarged structure schematic diagram of B in the figure;

[0019] Figure 6 It is a shaft cylinder mechanism structure schematic diagram of a liquid static pressure rotary table of the embodiment of the application;

[0020] Icon: chassis 1, oil tank 2, hydraulic pump 3, rotary table 4, support table 5, gasket 6, first gasket 7, second gasket 8, limiting wall 9, limiting groove 10, corrugated pipe 11, silica gel hose 12, semicircular cavity plate 13, resin filter screen 14, protective shell 15, DC motor stator 16, DC motor rotor 17, upper shaft cylinder 18, lower shaft cylinder 19, insertion groove round block 20, insertion piece ring plate 21, connecting part 22, connecting insertion rod 23, grating mechanism 24, shaft cylinder mechanism 25, mounting shaft 26, protruding part 27, sleeve rod 28, limiting rod 29. DETAILED DESCRIPTION

[0021] To make the purpose, technical scheme and advantages of the embodiments of the application clearer, the technical scheme in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are some of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application. Therefore, the following detailed description of the embodiments of the application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0022] EMBODIMENT

[0023] In combination with Figures 1 to 6As shown, the embodiment provides a hydrostatic rotary table, which comprises an oil guiding mechanism, a driving mechanism, a grating mechanism 24 and a rotary table assembly; the oil guiding mechanism comprises a base plate 1, an oil tank 2 arranged on the base plate 1, a hydraulic pump 3 arranged in the oil tank 2, and a plurality of oil guiding assemblies connected to the upper end surface of the oil tank 2 and arranged along the axis of the oil tank 2; the rotary table assembly comprises a rotary table 4 and a supporting table 5 arranged below the rotary table 4; the upper end surface of the supporting table 5 is provided with a plurality of first placing grooves and a plurality of second placing grooves corresponding to the oil guiding assemblies and in communication with the oil guiding assemblies; the first placing grooves are provided with gaskets 6; the second placing grooves are provided with gaskets; the axis of the supporting table 5 is provided with a through hole; the lower end surface of the supporting table 5 is provided with at least one limiting wall 9; the grating mechanism 24 is arranged on the upper end surface of the oil tank 2; the upper end surface of the oil tank 2 is provided with a limiting groove 10 matched with the limiting wall 9; the driving mechanism is arranged at the axis of the upper end surface of the oil tank 2 and connected with the rotary table 4 through the through hole; the hydraulic pump 3 is used for transmitting oil, and the outer surfaces of the gaskets 6 and the gaskets and / or the contact surfaces between the rotary table 4 and the supporting table 5 form oil films through the oil guiding assemblies.

[0024] Specifically, in the embodiment, as shown in Figure 2 and Figure 3 , the limiting groove 10 is formed by two upward protruding retaining walls arranged on the upper end surface of the oil tank 2; the limiting wall 9 is arranged in the limiting groove 10; the oil guiding assembly comprises a bellows 11, a silica gel hose 12 and a semicircular cavity plate 13; one end of the bellows 11 is connected to the upper end surface of the oil tank 2, and the other end is connected to the silica gel hose 12; the top end of the silica gel hose 12 is connected to the semicircular cavity plate 13, and the bottom end of the semicircular cavity plate 13 is in communication with the silica gel hose 12; the upper end of the semicircular cavity plate 13 is provided with a resin filter screen 14, and the resin filter screen 14 is connected to the gasket; the bellows 11 has a certain flexible stretching ability, is durable and is not easy to be damaged. As shown in Figure 5 , the gasket comprises a first gasket 7 and a second gasket 8; the first gasket 7 is connected to the rotary table 4 arranged in the second placing groove and is provided with a protruding portion 27 at the bottom; the upper end surface of the second gasket 8 is provided with a groove matched with the protruding portion 27, and a plurality of oil guiding holes are arranged on the second gasket 8 along the axial direction; the oil guiding holes are in communication with the oil guiding assembly. The resin filter screen 14 can filter impurity particles in the oil and can also slow down the oil pressure, so that the oil gradually penetrates through the oil guiding holes to form an oil film on the surface of the first gasket 7, and then the gap between the rotary table 4 and the supporting member causes the surface of the gasket 6 to also form an oil film; the gasket 6 and the gasket are made of wear-resistant rubber or silica gel material and have a certain buffering effect to ensure the stability of the rotary table 4.

[0025] As Figure 6 shown, the drive mechanism includes a protective shell 15, a DC motor stator 16, a DC motor rotor 17, a shaft cylinder mechanism 25; the upper end surface shaft center of the oil tank 2 is rotationally provided with a mounting shaft 26; the DC motor rotor 17 is fixed to the mounting shaft 26; the DC motor stator 16 is provided outside the DC motor rotor 17; the protective shell 15 is provided outside the DC motor stator 16. The shaft cylinder mechanism 25 includes a lower shaft cylinder 19 connected to the upper end of the mounting shaft 26, and an upper shaft cylinder 18 connected to the rotary table 4; the upper shaft cylinder 18 is fixedly provided with a slot round block 20; the lower shaft cylinder 19 is provided with a plug-in ring plate 21 embedded with the slot round block 20; the bottom of the plug-in ring plate 21 is provided with a sleeve rod 28, which is connected to the inside of the lower shaft cylinder 19 through a limiting rod 29; the outside of the lower shaft cylinder 19 and the upper shaft cylinder 18 are both provided with a connecting part 22, which is connected through a connecting plug rod 23. Through the vertical insertion of the slot round block 20 and the plug-in ring plate 21, when the oil film is slightly floating between the rotary table 4 and the support table 5, the rotary table 4 and the DC motor rotor 17 are ensured to rotate synchronously.

[0026] It should be noted that the grating mechanism 24 is a prior art, which is not specifically described here. Through the feedback of the DC motor rotor 17 and the grating ring mechanism, full closed loop control of the servo rotary table 4 is realized, and the control accuracy of the rotation angle is ensured.

[0027] The present application provides a kind of liquid static pressure rotary table 4 with oil guide mechanism, drive mechanism, grating mechanism 24 and rotary table 4 assembly, when the liquid static pressure rotary table 4 is operated, hydraulic pump 3 is reciprocating hydraulic pump, oil is continuously transported to the contact surface between rotary table 4 and support table 5 by oil guide mechanism, so that contact surface and gasket 6 and gasket generate oil film;Rotary table 4 and support table 5 are better guaranteed by surface contact, and the horizontal stability of rotary table 4, and the oil film makes rotary table 4 in micro floating state, which ensures the smooth rotation of rotary table 4;Gasket gasket 6 greatly reduces the horizontal vibration, thereby ensuring the rotation accuracy of rotary table 4.

[0028] The present application also provides a kind of machine tool, including the liquid static pressure rotary table 4, the chassis 1 and the support table 5 are fixed on machine table;The rotary table 4 is used for connecting other processing equipment or workpiece positioning equipment etc.

[0029] The above is only the preferred embodiment of the present application, the protection scope of the present application is not limited to the above-mentioned examples, any technical scheme belonging to the idea of the present application is within the protection scope of the present application.

[0030] In the description of the application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0031] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0032] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] In the present application, unless otherwise explicitly specified and limited, the first feature "above" or "below" the second feature can include the direct contact between the first and second features, or it can include the contact between the first and second features through another feature between them. Moreover, the first feature "above", "above" and "above" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes the first feature directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

Claims

1. A hydrostatic rotary table, characterized in that, The system includes an oil guiding mechanism, a drive mechanism, a grating mechanism, and a turntable assembly. The oil guiding mechanism includes a chassis, an oil tank mounted on the chassis, a hydraulic pump housed within the oil tank, and multiple oil guiding components connected to the upper surface of the oil tank, evenly distributed along the tank's axis. The turntable assembly includes a turntable and a support platform beneath the turntable. The upper surface of the support platform is provided with multiple first placement grooves and multiple second placement grooves corresponding to and communicating with the oil guiding components. Washers are provided on the first placement grooves. The groove is equipped with a gasket; the support platform has a through hole at its axis; the lower end face of the support platform has at least one retaining wall; the grating mechanism is located on the upper end face of the oil tank; the upper end face of the oil tank has a retaining groove adapted to the retaining wall; the drive mechanism is located at the axis of the upper end face of the oil tank and is connected to the turntable through the through hole; the hydraulic pump is used to transmit oil, and the oil guiding assembly forms an oil film between the outer surfaces of the gasket and the gasket and / or the contact surface between the turntable and the support platform; The gasket includes a first gasket and a second gasket; the first gasket is connected to the turntable and placed in the second placement slot, and has a protrusion at its bottom; the upper surface of the second gasket has a groove that matches the protrusion, and the second gasket has a plurality of oil guide holes along its axial direction; the oil guide holes are connected to the oil guide assembly; the gasket and the washer are made of wear-resistant rubber or silicone material.

2. The hydrostatic rotary table according to claim 1, characterized in that, The oil guiding assembly includes a bellows, a silicone hose, and a semi-circular cavity plate; one end of the bellows is connected to the upper surface of the oil tank, and the other end is connected to the silicone hose; the top end of the silicone hose is connected to the semi-circular cavity plate, and the bottom end of the semi-circular cavity plate is connected to the silicone hose.

3. The hydrostatic rotary table according to claim 1, characterized in that, The drive mechanism includes a protective shell, a DC motor stator, and a DC motor rotor; a mounting shaft is rotatably mounted at the center of the upper end face of the oil tank; the DC motor rotor is fixed on the mounting shaft; the DC motor stator is located outside the DC motor rotor; and the protective shell is located outside the DC motor stator.

4. The hydrostatic rotary table according to claim 3, characterized in that, It also includes a shaft cylinder mechanism, which includes a lower shaft cylinder with one end connected to the upper end of the mounting shaft and an upper shaft cylinder with one end connected to the turntable; a slotted round block is fixed inside the upper shaft cylinder; an insert ring plate that fits into the slotted round block is provided inside the lower shaft cylinder; both the lower shaft cylinder and the upper shaft cylinder are provided with connecting parts on their outer sides, and are connected by connecting rods.

5. A machine tool, characterized in that, Including the hydrostatic rotary table as described in any one of claims 1-4.

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