Outer rotor static pressure rotary table

Abstract

The utility model discloses an outer rotor static pressure rotary table, which comprises a working table, a base, a bearing and an outer rotor type motor, the outer rotor type motor comprises a stator and a rotor, the stator is fixedly connected with the base, and the rotor is coaxially sleeved outside the stator and can rotate relative to the stator; the workbench comprises a platen and a hollow shaft, one end of the hollow shaft is fixedly connected with the platen, and a gap is reserved between the other end of the hollow shaft and the base. The outer wall of the hollow shaft, the platen and the base define a first cavity for containing a bearing, the base supports the workbench through the bearing, the inner wall of the hollow shaft, the platen and the base define a second cavity for containing an outer rotor type motor, and the hollow shaft coaxially sleeves the rotor and can rotate along with the rotor. The projection of the first cavity and the projection of the second cavity in the axial direction of the hollow shaft are not overlapped, and the projection of the first cavity and the projection of the second cavity in the radial direction of the hollow shaft are overlapped. On the premise that normal use of the rotary table is ensured, the size is reduced, and light weight is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of numerical control machine tools, in particular to an outer rotor static pressure turntable. Background Art

[0002] CNC machine tools are efficient, precise and multifunctional machine tools, and are an important part of modern manufacturing. Lightweighting is the future development trend of machine tools. The goal of "green design" can be achieved by optimizing the design of machine tool structures or components. The turntable, as a carrier for controlling the rotation of workpieces in CNC machine tools, plays a very important role. How to reduce the volume and achieve lightweighting while ensuring the normal use of the turntable has been the focus of structural design research and development in recent years. Summary of the invention

[0003] The utility model provides an outer rotor static pressure turntable, which reduces the volume and realizes lightness under the premise of ensuring the normal use of the turntable.

[0004] In order to achieve the above purpose, the technical solution of the utility model is:

[0005] An outer rotor static pressure turntable, comprising: a worktable, a base, a bearing and an outer rotor type motor, wherein the outer rotor type motor comprises a stator and a rotor, wherein the stator is fixedly connected to the base, and the rotor is coaxially sleeved outside the stator and can rotate relative to the stator;

[0006] The workbench includes a table plate and a hollow shaft, one end of the hollow shaft is fixedly connected to the table plate, and a gap is left between the other end of the hollow shaft and the base;

[0007] The outer wall of the hollow shaft, the table plate and the base form a first cavity for accommodating the bearing, the base supports the workbench through the bearing, the inner wall of the hollow shaft, the table plate and the base form a second cavity for accommodating the outer rotor type motor, and the hollow shaft is coaxially sleeved outside the rotor and can rotate with the rotor;

[0008] There is no overlap in the projections of the first cavity and the second cavity in the axial direction of the hollow shaft, and there is an overlap in the projections of the first cavity and the second cavity in the radial direction of the hollow shaft.

[0009] Further, it also includes a clamping ring and a clamp;

[0010] The clamping ring is fixed to one end of the hollow shaft close to the table plate, the clamp is located in the clamping ring and fixed to one end of the base close to the table plate, and the clamp can brake the clamping ring.

[0011] Furthermore, it also includes an angle encoder, an encoder bracket, an encoder spindle and a blocking plate, wherein the blocking plate is fixed in a hole opened in the center of the table;

[0012] The encoder bracket is fixed to one end of the hollow shaft close to the table, the angle encoder is installed on the encoder bracket, one end of the encoder core shaft is fixedly connected to the table, and the other end of the encoder core shaft is connected to the angle encoder.

[0013] Furthermore, it also includes an adjustment pad, which is arranged between the angle encoder and the encoder core shaft.

[0014] Furthermore, the bearing is a hydrostatic bearing.

[0015] Furthermore, it also includes a labyrinth ring, which is fixed to one end of the table near the base, and the labyrinth ring and the base form a first labyrinth sealing structure, and the first labyrinth sealing structure is connected to the first cavity;

[0016] The base is provided with an airtight sealing channel, and the airtight sealing channel is connected to the first labyrinth sealing structure.

[0017] Furthermore, one end of the hollow shaft close to the base forms a second labyrinth sealing structure with the base, and the second labyrinth sealing structure is connected to the second cavity;

[0018] The base is provided with a hydraulic oil channel and an oil outlet channel, and the hydraulic oil channel and the oil outlet channel are respectively connected to the first cavity.

[0019] Beneficial effects of the utility model:

[0020] The utility model provides an outer rotor static pressure turntable, which has a larger diameter-to-height ratio by making the projections of the first cavity for accommodating the bearing and the second cavity for accommodating the outer rotor motor in the axial direction of the hollow shaft not overlap and the projections of the first cavity and the second cavity in the radial direction of the hollow shaft overlap. Under the same diameter and the same bearing area, the height of the turntable is lower, the center of gravity is lower when carrying a workpiece, the rotation is more stable, the total volume is smaller, and the turntable is lightweight;

[0021] Compared with other types of motors with the same torque, the outer rotor motor has a small volume. The utility model provides an outer rotor static pressure turntable, which drives the turntable through the outer rotor motor, thereby reducing the total volume of the turntable and further achieving lightweighting of the turntable.

[0022] At the same time, the outer rotor motor directly drives the turntable's worktable to rotate, which conforms to the development trend of the gradual promotion of direct-drive turntable technology. The direct-drive turntable technology enables the turntable to have the advantages of high speed and high precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a cross-sectional view of an outer rotor static pressure turntable disclosed in the utility model;

[0025] Figure 2 for Figure 1 A local enlarged view of point E;

[0026] Figure 3 This is a front view of an outer rotor static pressure turntable disclosed in the utility model;

[0027] Figure 4 It is a top view of an outer rotor static pressure turntable disclosed in the utility model;

[0028] Figure 5 It is a bottom view of an outer rotor static pressure turntable disclosed in the utility model;

[0029] Figure 6 It is a schematic diagram when the first cavity and the second cavity are in different positions.

[0030] In the figure:

[0031] 1. Base; 101. Air sealing hole; 102. Hydraulic oil hole; 103. Oil outlet hole;

[0032] 2. Stator;

[0033] 3. Rotor;

[0034] 4. Tablet;

[0035] 5. Hollow shaft;

[0036] 6. Bearing; 601. Radial oil pad; 602. Axial oil pad;

[0037] 7. Clamping ring;

[0038] 8. Clamp;

[0039] 9. Angle encoder;

[0040] 10. Encoder bracket;

[0041] 11. Encoder mandrel;

[0042] 12. Blocking plate;

[0043] 13. Labyrinth ring;

[0044] 14. Adjustment pad;

[0045] A, first cavity; B, second cavity; F, first labyrinth sealing structure; G, second labyrinth sealing structure. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0047] This embodiment provides an outer rotor static pressure turntable, such as Figure 1 As shown, it includes: a workbench, a base 1, a bearing 6 and an outer rotor type motor, wherein the outer rotor type motor includes a stator 2 and a rotor 3, wherein the stator 2 is fixedly connected to the base 1 by bolts, and the rotor 3 is coaxially sleeved outside the stator 2 and can rotate relative to the stator 2;

[0048] The workbench includes a table plate 4 and a hollow shaft 5, one end of the hollow shaft 5 is fixedly connected to the table plate 4 by bolts, which is convenient for disassembly and maintenance of the turntable, and a gap is left between the other end of the hollow shaft 5 and the base 1, through which the hollow shaft 5 can be rotated relative to the base 1;

[0049] The outer wall of the hollow shaft 5, the table 4 and the base 1 form a first cavity for accommodating the bearing 6. The base 1 supports the workbench through the bearing 6. The inner wall of the hollow shaft 5, the table 4 and the base 1 form a second cavity for accommodating the outer rotor motor. The hollow shaft 5 is coaxially sleeved outside the rotor 3 and can rotate with the rotor 3.

[0050] The projections of the first cavity and the second cavity in the axial direction of the hollow shaft 5 do not overlap, and the projections of the first cavity and the second cavity in the radial direction of the hollow shaft 5 overlap;

[0051] The outer rotor static pressure turntable provided in this embodiment has a larger diameter-to-height ratio by making the projections of the first cavity for accommodating the bearing 6 and the second cavity for accommodating the outer rotor motor in the axial direction of the hollow shaft 5 not overlap and the projections of the first cavity and the second cavity in the radial direction of the hollow shaft 5 overlap. Under the same diameter and the same bearing area, the height of the turntable is lower, the center of gravity is lower when carrying a workpiece, the rotation is more stable, the total volume is smaller, and the turntable is lightweight;

[0052] To better illustrate the effect, three types of turntables with the first cavity and the second cavity at different positions are introduced below;

[0053] The positional relationship between the first cavity A and the second cavity B of the outer rotor static pressure turntable provided in this embodiment is as follows: Figure 6 As shown in a, the dotted line in the middle is the rotation center line of the turntable (i.e. the axis of the hollow shaft 5);

[0054] There is no overlap between the projections of the first cavity A and the second cavity B of the turntable in the axial and radial directions of the hollow shaft 5. Figure 6 As shown in b;

[0055] The projections of the first cavity A and the second cavity B of the turntable in the axial direction of the hollow shaft 5 overlap, and the projections of the first cavity A and the second cavity B in the radial direction of the hollow shaft 5 do not overlap, such as Figure 6 As shown in c;

[0056] It can be clearly seen that when the first cavity A and the second cavity B are of the same size, the outer rotor static pressure turntable provided in this embodiment has a larger diameter-to-height ratio. When a table plate 4 with the same bearing area is used, the turntable height is lower and the total volume is smaller.

[0057] Compared with other types of motors with the same torque, the outer rotor motor has a smaller volume. The outer rotor hydrostatic turntable provided in this embodiment drives the turntable through the outer rotor motor, thereby reducing the total volume of the turntable and further achieving lightweighting of the turntable.

[0058] At the same time, the outer rotor motor directly drives the turntable's worktable to rotate, which conforms to the development trend of the gradual promotion of direct-drive turntable technology. The direct-drive turntable technology enables the turntable to have the advantages of high speed and high precision.

[0059] In a specific embodiment, Figure 1 As shown, it also includes a clamping ring 7 and a clamp 8;

[0060] The clamping ring 7 is fixed to one end of the hollow shaft 5 close to the table plate 4. In the present embodiment, the rotor 3 is fixed to the clamping ring 7 by bolts, and the clamping ring 7 is fixed to the hollow shaft 5 by bolts. The clamp 8 is located in the clamping ring 7 and is fixed to one end of the base 1 close to the table plate 4 by bolts. The clamp 8 can brake the clamping ring 7, thereby braking the hollow shaft 5 and stopping the workbench from rotating. In the present embodiment, the clamp 8 is a pneumatic clamp.

[0061] In a specific embodiment, Figure 2 and Figure 5 As shown, it also includes an angle encoder 9, an encoder bracket 10, an encoder spindle 11 and a blocking plate 12, as shown in FIG. Figure 4As shown, the blocking plate 12 is fixed in the hole opened in the center of the table 4 by bolts, which is convenient for disassembly and assembly and maintenance of the angle encoder 9. In this embodiment, the angle encoder 9 adopts a Heidenhain encoder;

[0062] The encoder bracket 1 is fixed to one end of the hollow shaft 5 close to the table 4 by bolts, the angle encoder 9 is installed on the encoder bracket 10, one end of the encoder core shaft 11 is fixedly connected to the table 4 by bolts, and the other end of the encoder core shaft 11 is connected to the angle encoder 9. The angle encoder 9 is used for rotation angle measurement and angular position feedback of the table 4.

[0063] In a specific embodiment, the bearing 6 is a hydrostatic bearing, which is fixed to the base 1 by bolts. Figure 1 As shown, the hydrostatic bearing is provided with a radial oil pad 601 and an axial oil pad 602. The hydrostatic bearing forms an oil film between the table plate 4 and the hollow shaft 5 through the axial oil pad 602, which plays a thrust role on the table plate 4 and the hollow shaft 5. The hydrostatic bearing forms an oil film between the radial oil pad 601 and the hollow shaft 5, which ensures the precise positioning of the hollow shaft 5 in the radial direction.

[0064] The application of hydrostatic technology in the field of CNC machine tools is becoming more and more extensive. The hydrostatic turntable using hydrostatic bearings has the advantages of large load-bearing capacity, high rotation accuracy, low friction, and no wear. The outer rotor hydrostatic turntable provided in this embodiment combines the hydrostatic technology and the direct-drive turntable technology to provide an implementation scheme for a hydrostatic direct-drive turntable with the advantages of high load-bearing capacity, high speed, high precision, and long life.

[0065] In a specific embodiment, Figure 2 As shown, an adjustment pad 14 is also included. The adjustment pad 14 is arranged between the angle encoder 9 and the encoder core shaft 11. By adding the adjustment pad 14, the requirement for the axial dimension tolerance accuracy of the angle encoder 9 and the encoder core shaft 11 is reduced.

[0066] In a specific embodiment, Figure 1 and Figure 3 As shown, it also includes a labyrinth ring 13, which is fixed to one end of the table 4 close to the base 1 by bolts, and the labyrinth ring 13 and the base 1 form a first labyrinth sealing structure F, and the first labyrinth sealing structure F is connected to the first cavity;

[0067] like Figure 1 As shown, the base 1 is provided with an airtight channel 101, and the airtight channel 101 is connected to the first labyrinth sealing structure F. Air is supplied through the airtight channel 101, and cooperates with the first labyrinth sealing structure F to form a reliable airtight seal to prevent dust, cutting chips and other impurities from entering the turntable.

[0068] In a specific embodiment, one end of the hollow shaft 5 close to the base 1 forms a second labyrinth sealing structure G with the base 1, and the second labyrinth sealing structure G is connected to the second cavity;

[0069] like Figure 1 As shown, the base 1 is provided with a hydraulic oil channel 102 and an oil outlet channel 103, the hydraulic oil channel 102 and the oil outlet channel 103 are respectively connected to the first cavity, the bearing 6 in the first cavity is supplied with oil through the hydraulic oil channel 102, and the oil is discharged through the oil outlet channel 103;

[0070] The second labyrinth seal structure G prevents oil from entering the second cavity and contaminating the outer rotor motor.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. An outer rotor static pressure turntable, characterized in that: include: A workbench, a base (1), a bearing (6) and an outer rotor type motor, wherein the outer rotor type motor comprises a stator (2) and a rotor (3), wherein the stator (2) is fixedly connected to the base (1), and the rotor (3) is coaxially sleeved outside the stator (2) and can rotate relative to the stator (2); The workbench comprises a tabletop (4) and a hollow shaft (5), one end of the hollow shaft (5) is fixedly connected to the tabletop (4), and a gap is left between the other end of the hollow shaft (5) and the base (1); The outer wall of the hollow shaft (5), the table plate (4) and the base (1) form a first cavity for accommodating a bearing (6); the base (1) supports a workbench via the bearing (6); the inner wall of the hollow shaft (5), the table plate (4) and the base (1) form a second cavity for accommodating an outer rotor motor; the hollow shaft (5) is coaxially sleeved outside the rotor (3) and is capable of rotating with the rotor (3); There is no overlap in the projections of the first cavity and the second cavity in the axial direction of the hollow shaft (5), and there is an overlap in the projections of the first cavity and the second cavity in the radial direction of the hollow shaft (5).

2. The outer rotor static pressure turntable according to claim 1, characterized in that: Also includes a clamping ring (7) and a clamp (8); The clamping ring (7) is fixed to one end of the hollow shaft (5) close to the table (4); the clamp (8) is located inside the clamping ring (7) and fixed to one end of the base (1) close to the table (4); the clamp (8) is capable of braking the clamping ring (7).

3. The outer rotor static pressure turntable according to claim 1, characterized in that: It also includes an angle encoder (9), an encoder bracket (10), an encoder spindle (11) and a blocking plate (12), wherein the blocking plate (12) is fixed in a hole opened in the center of the table plate (4); The encoder bracket (10) is fixed to one end of the hollow shaft (5) close to the table (4), the angle encoder (9) is installed on the encoder bracket (10), one end of the encoder core shaft (11) is fixedly connected to the table (4), and the other end of the encoder core shaft (11) is connected to the angle encoder (9).

4. The outer rotor static pressure turntable according to claim 1, characterized in that: It also comprises an adjustment pad (14), wherein the adjustment pad (14) is arranged between the angle encoder (9) and the encoder core shaft (11).

5. The outer rotor static pressure turntable according to claim 1, characterized in that: The bearing (6) is a hydrostatic bearing.

6. The outer rotor static pressure turntable according to claim 1, characterized in that: It also includes a labyrinth ring (13), the labyrinth ring (13) being fixed to one end of the table plate (4) close to the base (1), the labyrinth ring (13) and the base (1) forming a first labyrinth sealing structure, the first labyrinth sealing structure being connected to the first cavity; The base (1) is provided with an airtight hole (101), and the airtight hole (101) is connected to the first labyrinth sealing structure.

7. The outer rotor static pressure turntable according to claim 1, characterized in that: One end of the hollow shaft (5) close to the base (1) forms a second labyrinth sealing structure with the base (1), and the second labyrinth sealing structure is connected to the second cavity; The base (1) is provided with a hydraulic oil channel (102) and an oil outlet channel (103), and the hydraulic oil channel (102) and the oil outlet channel (103) are respectively connected to the first cavity.

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