CN114393553A - High-precision rotary table system driven by lead screw in linear mode - Google Patents
High-precision rotary table system driven by lead screw in linear mode Download PDFInfo
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Abstract
The invention provides a high-precision rotary table system driven by a lead screw in a linear mode, which comprises an optical platform, a rotary table supporting assembly, a rotary table platform, a rotary table transmission sliding block mechanism, a rotary table lead screw connecting assembly, a rotary table lead screw power assembly, a rotary table supporting guide rail connecting assembly, a rotary table supporting guide rail tool, a rotary table limiting column, a platform limiting column and a rotary table lead screw tool. The turntable system is compact in structure, self-locking is formed through the combined action of the slide block, the inclined plane of the lead screw and the motor reducer during locking, and locking is reliable.
Description
Technical Field
The invention belongs to the technical field of rotary tables, and particularly relates to a high-precision rotary table system driven by a lead screw in a linear mode.
Background
The vacuum common optical path can simulate the vacuum environment during on-orbit work, and the system error introduced by the vacuum air correction coefficient is eliminated. Firstly, a solar absolute radiometer measures a solar simulation light source, then a vacuum common light path device is rotated, the same solar simulation light source is calibrated by a low-temperature absolute radiometer, and the solar absolute radiometer is calibrated by comparing measurement results.
The vacuum comparison turntable is an important device for carrying a high-precision instrument, increasing the degree of freedom of a system, realizing high-precision repeated positioning and determining the accuracy of the light path incident angle of the vacuum common light path comparison device. Therefore, the improvement of the positioning precision of the rotary table has important significance for improving the calibration precision of the space optical remote sensing instrument.
At present, a heavy-load turntable device mainly comprises two schemes of spindle direct drive and gear ring and rack drive. The main shaft direct drive has higher requirements on motor torque and control, and has large load and poor repeated positioning accuracy; the requirement of the gear ring rack drive on the motor torque is small, but the gear ring rack processing difficulty is large, the cost is high, and the requirement of high rotation precision is difficult to achieve.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a high-precision turntable driven by a lead screw in a linear mode. In order to achieve the purpose, the invention adopts the following specific technical scheme:
a high-precision turntable system driven by a lead screw in a linear mode comprises an optical platform, a turntable supporting assembly, a turntable platform, a turntable transmission sliding block mechanism, a turntable lead screw connecting assembly, a turntable lead screw power assembly, a turntable supporting guide rail connecting assembly, a turntable supporting guide rail tool, a turntable limiting column, a platform limiting column and a turntable lead screw tool;
the turntable supporting assembly is positioned between the turntable platform and the optical platform and is fixedly connected with the turntable platform and the optical platform respectively, the turntable supporting assembly is a shafting system, a first main shaft is arranged on the turntable supporting assembly, a groove is formed in the turntable platform, and the first main shaft of the turntable supporting assembly is inserted into the groove in the turntable platform and is used for being in clearance fit with the turntable platform;
the turntable transmission sliding block mechanism is fixedly connected with the turntable platform, the turntable lead screw connecting assembly and the turntable support guide rail connecting assembly respectively;
the number of the turntable transmission sliding block mechanisms is at least three, each turntable transmission sliding block mechanism is arranged between the turntable platform and the optical platform, and each turntable transmission sliding block mechanism consists of a linear guide rail and a sliding block;
the guide rail of the turntable transmission sliding block mechanism is fixedly connected with the turntable platform, and the sliding block of the turntable transmission sliding block mechanism is respectively and fixedly connected with the turntable lead screw connecting assembly and the turntable support guide rail connecting assembly;
the turntable screw power assembly is a power device comprising a screw, a motor and a speed reducer;
the turntable support guide rail is a linear guide rail;
the turntable support guide rail connecting assembly is a shafting system;
the turntable support guide rail tool is fixedly connected with the turntable support guide rail and is fixed on the optical platform;
at least one cross section of the turntable support guide rail tool is rectangular, and a threaded hole and a counter bore are formed in the turntable support guide rail tool;
the rotary table screw rod tool is fixedly connected with the rotary table screw rod power assembly and is fixed on the optical platform;
the platform limiting column is fixedly connected with the optical platform;
the turntable limiting column is fixedly connected with the turntable platform and is arranged on the turntable platform.
Preferably, the turntable support assembly is a shafting system composed of a first main shaft, a first thrust ball bearing, a first deep groove ball bearing, a first elastic retainer ring, a first encoder and a first bearing seat.
Preferably, the turntable lead screw connecting assembly is a shafting system at least comprising a second bearing seat, a second deep groove ball bearing, a shaft, a second elastic retainer ring and an end cover.
Preferably, the turntable support rail connecting assembly is a shafting system at least comprising a third bearing seat, a third thrust ball bearing, a third deep groove ball bearing and a third elastic retainer ring.
Preferably, the turntable limiting column is a two-section stepped cylinder consisting of a small cylinder and a large cylinder, the small cylinder is provided with threads, and the large cylinder is radially provided with a through hole.
Preferably, the turntable screw power assembly and the turntable support rail assembly are placed in parallel.
Preferably, the turntable transmission sliding mechanism and the turntable lead screw are vertically arranged, and the turntable transmission sliding mechanism and the turntable support guide rail assembly are vertically arranged.
Preferably, an encoder is arranged on the turntable supporting component, and the encoder of the turntable supporting component and a motor of the turntable lead screw power component form closed-loop control.
Preferably, when the slide block of the turntable transmission slide block mechanism slides to the limit positions at two sides, the turntable limiting column collides with the platform limiting column.
Preferably, the range of rotation of the turntable platform is-18 ° to +18 °.
The invention can obtain the following technical effects:
the high-precision rotary table driven by the lead screw in a linear mode can realize high-precision rotation under the heavy-load condition. The invention converts the circular motion into the linear motion, improves the rotation precision, reduces the processing cost, and has the characteristics of simple assembly and adjustment, high rotation precision, large load, high reliability and low cost. The turntable system is compact in structure, self-locking is formed through the combined action of the slide block, the inclined plane of the lead screw and the motor reducer during locking, and locking is reliable.
Drawings
FIG. 1 is a schematic structural diagram of a high-precision turntable driven by a lead screw in a linear mode according to an embodiment of the invention;
FIG. 2 is a cross-sectional structural schematic view of a turntable support assembly according to one embodiment of the present invention;
FIG. 3 is a schematic diagram of a turret table according to an embodiment of the invention;
FIG. 4 is a schematic cross-sectional view of a turret screw connection assembly according to an embodiment of the invention;
FIG. 5 is a cross-sectional structural schematic view of a turntable support assembly of one embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a turntable spacer according to an embodiment of the present invention;
FIG. 7 is a schematic structural view of a landing stop post according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a high-precision turntable driven by a lead screw in a linear manner according to an embodiment of the invention.
The attached drawings are as follows:
the device comprises a turntable supporting component 1, a turntable platform 2, a turntable transmission sliding block mechanism 3, a turntable lead screw connecting component 4, a turntable lead screw power component 5, a turntable support guide rail connecting component 6, a turntable support guide rail 7, a turntable support guide rail tool 8, a turntable limiting column 9, a platform limiting column 10, a turntable lead screw tool 11, an optical platform 12, a first main shaft 101, a first thrust ball bearing 102, a first deep groove ball bearing 103, a first elastic retainer ring 104, a first encoder 105, a first bearing seat 106, a second bearing seat 402, a second deep groove ball bearing 403, a second main shaft 401, a second elastic retainer ring 404, an end cover 405, a third main shaft 601, a third thrust ball bearing 602, a third deep groove ball bearing 603, a third bearing seat 604 and a third elastic retainer ring 605.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention.
The invention aims to provide a high-precision rotary table system driven by a lead screw in a linear mode. The invention provides a high-precision turntable system driven by a lead screw linearly, which is described in detail through specific embodiments.
Fig. 1 shows a high-precision turntable system 100 driven by a lead screw in a linear manner, which comprises an optical platform 12, a turntable support assembly 1, a turntable platform 2, a turntable transmission slide block mechanism 3, a turntable lead screw connection assembly 4, a turntable lead screw power assembly 5, a turntable support guide rail connection assembly 6, a turntable support guide rail 7, a turntable support guide rail tool 8, a turntable limit column 9, a platform limit column 10 and a turntable lead screw tool 11;
the turntable supporting assembly 1 is located between the turntable platform 2 and the optical platform 3, the turntable supporting assembly 1 is fixedly connected with the turntable platform 2 and the optical platform 12 respectively, the turntable supporting assembly 1 is a shafting system, a first main shaft is arranged on the turntable supporting assembly 1, a groove is formed in the turntable platform, and the first main shaft of the turntable supporting assembly 1 is inserted into the groove in the turntable platform 2 and is used for being in clearance fit with the turntable platform 2;
the turntable transmission sliding block mechanism 3 is fixedly connected with the turntable platform 2, the turntable lead screw connecting assembly 4 and the turntable support guide rail connecting assembly 6 respectively;
the number of the turntable transmission sliding block mechanisms 3 is at least three, each turntable transmission sliding block mechanism 3 is arranged between the turntable platform 2 and the optical platform 12, and each turntable transmission sliding block mechanism 3 consists of a linear guide rail and a sliding block;
the guide rail of the turntable transmission sliding block mechanism 3 is fixedly connected with the turntable platform 2, and the sliding block of the turntable transmission sliding block mechanism 3 is respectively and fixedly connected with the turntable lead screw connecting assembly 4 and the turntable support guide rail connecting assembly 6;
the turntable screw power assembly 5 is a power device comprising a screw, a motor and a speed reducer;
the turntable support guide rail 7 is a linear guide rail;
the turntable support guide rail connecting assembly 6 is a shafting system;
the turntable support guide rail tool 8 is fixedly connected with the turntable support guide rail 7 and is fixed on the optical platform 12;
the turntable support guide rail tool 8 is a cuboid, and a threaded hole and a counter sink are formed in the turntable support guide rail tool 8;
the turntable screw tool 11 is fixedly connected with the turntable screw power assembly 5 and is fixed on the optical platform 12;
the platform limiting column 10 is fixedly connected with the optical platform 12;
the turntable limiting column 9 is fixedly connected with the turntable platform 2 and is arranged on the turntable platform 2.
As shown in fig. 2, the turntable support assembly 1 is a shafting system consisting of a first main shaft 101, a first thrust ball bearing 102, a first deep groove ball bearing 103, a first elastic retainer ring 104, a first encoder 105 and a first bearing seat 106; the first bearing seat 106 and the first main shaft 101 are sequentially connected with the first thrust ball bearing 102, the first deep groove ball bearing 103, the first elastic retainer ring 104 and the first encoder 105 from top to bottom; above the first bearing housing 1106 is placed the first thrust ball bearing 102, which axially supports the main shaft 101 and is locked against axial displacement by the first circlip 104. The first deep groove ball bearing 103 is arranged in the middle of the first bearing seat 106 and connected with the first main shaft 101 to limit the radial displacement of the first main shaft 101. A first encoder 105 is disposed below the first bearing seat 106, and is fixedly connected to the first main shaft 101 and elastically connected to the first bearing seat 106.
As shown in fig. 3, the overall shape of the turntable platform 2 is approximately symmetrical triangle, and a circular groove is arranged at one corner of the platform. As shown in fig. 1, the turntable transmission slide block mechanism 3 has three groups, all of which are common linear guide rails with the same length and model, and each group is provided with one slide block; the turntable screw power assembly is a power device consisting of a screw, a motor and a speed reducer; the turntable support guide rail is a common linear guide rail and is provided with two sliding blocks; at least one cross section of the turntable support guide rail tool is rectangular, and further preferably, the turntable support guide rail tool 8 is a cuboid and is provided with a threaded hole and a counter bore; the turntable screw rod tool 11 is a cuboid and is provided with a threaded hole and a counter bore; the optical platform 12 is a common optical platform, and threaded holes are uniformly arranged on the optical platform 12.
As shown in fig. 4, the turntable screw connecting assembly 4 is a shafting system composed of a second bearing seat 402, a second deep groove ball bearing 403, a second main shaft 401, a second elastic collar 404 and an end cover 405; the second bearing housing 402 is connected to the second main shaft 401 through a second deep groove ball bearing 403, so as to axially support the second main shaft 401 and radially limit the position of the second main shaft 401. An end cover is arranged above the second bearing seat 402 and is not in contact with the second deep groove ball bearing 403; a second elastic retainer ring 404 is arranged below the second bearing seat 402 and used for locking the second main shaft 401 in the axial direction.
As shown in fig. 5, the turntable support rail connection assembly 6 is a shafting system composed of a third main shaft 601, a third bearing seat 604, a third thrust ball bearing 602, a third deep groove ball bearing 603 and a third elastic collar 605; the third bearing seat 604 and the third main shaft 601 are sequentially connected with a third thrust ball bearing 603, a third deep groove ball bearing 603 and a third elastic retainer ring 605 from top to bottom; a third thrust ball bearing 602 is disposed above the third bearing seat 604, axially supports the third main shaft 601, and is locked against axial displacement by a third circlip 605. A third deep groove ball bearing 603 is arranged in the middle of the third bearing seat 604, and is connected with the third main shaft 601 to limit the radial displacement of the third main shaft 601.
Preferably, the turntable limiting column 9 is a two-section stepped cylinder composed of a small cylinder and a large cylinder, the small cylinder is provided with a thread, and the large cylinder is radially provided with a through hole.
Preferably, the turntable screw power assembly 5 is placed in parallel with the turntable support rail connection assembly 6.
Preferably, the turntable transmission sliding mechanism 3 and the turntable screw connecting assembly 5 are vertically arranged, and the turntable transmission sliding mechanism 3 and the turntable support guide rail connecting assembly 6 are vertically arranged.
Preferably, a first encoder 105 is arranged on the turntable support assembly 1, and a first encoder 106 of the turntable support assembly 1 and a motor of the turntable screw power assembly 5 form closed-loop control.
Preferably, when the slide block of the turntable transmission slide block mechanism 3 slides to the limit positions at two sides, the turntable limiting column 9 collides with the platform limiting column 10.
Preferably, the turntable platform 2 is rotated in a range of-18 ° to +18 °.
The invention can obtain the following technical effects:
the high-precision rotary table driven by the lead screw in a linear mode can realize high-precision rotation under the heavy-load condition. The invention converts the circular motion into the linear motion, improves the rotation precision, reduces the processing cost, and has the characteristics of simple assembly and adjustment, high rotation precision, large load, high reliability and low cost.
The invention adopts linear drive to realize circular arc rotation, reduces the processing difficulty and the processing cost for processing the circular arc guide rail and the circular arc rack, and simultaneously uses the linear drive to easily improve the rotation precision of the turntable.
As shown in fig. 8, h represents the linear driving assembly displacement, d represents the distance of the lead screw power assembly 5 from the turntable support assembly 1, and α represents the turntable rotation angle.
For example: the lead screw guide rail with the common precision level has a lead screw lead of 6mm, the repeated positioning precision of 0.01mm, the distance between a lead screw of a lead screw power assembly 5 and a turntable supporting assembly 1 is 700mm, the motor step angle of the lead screw power assembly 5 is 1.8 degrees, the speed reducer reduction ratio of the lead screw power assembly 5 is 30, the combined return error of a motor speed reducer is less than 5', an absolute code encoder is 20 bits, and the repeated positioning precision of the encoder is 15'.
Then there is the turntable rotation accuracy:
the precision of the motor-driven screw under the condition of no subdivision is as follows:
1.8°÷360°÷30×6＝0.001mm (1)
the rotating precision of the rotary table is as follows:
arctan(0.001/700)÷2π×360°＝0.000082° (1)
absolute encoder precision:
360°÷220＝0.000343° (5)
then the rotating platform rotates and the positioning precision is repeated:
the maximum precision influence of the return error of the motor on the driving screw rod is as follows:
5'÷60'÷360°×6＝0.00139mm (2)
the repeated positioning precision of the power component of the lead screw guide rail is
h＝0.01mm+0.00139mm＝0.01239mm (3)
Calculating the positioning precision of the rotary table by adopting the repeated positioning precision of the lead screw
arctan(0.01239/700)÷2π×360°＝0.00093° (4)
Absolute encoder positioning accuracy:
15″＝0.0042° (5)
therefore, the rotational resolution and the repositioning accuracy of the lead screw turret depend primarily on the choice of encoder accuracy. The rotating precision of the rotary table superior to 0.0005 degrees and the repeated positioning precision superior to 0.005 degrees can be realized by adopting the parameter encoder.
The invention has the characteristics of simple installation and adjustment, high rotation precision, large load, high reliability and low cost, and is described in detail as follows:
1. the device is simple to install and adjust: the invention meets the requirement of freedom degree in the rotating process, has no over-positioning or under-positioning, only has one rotating freedom degree, and is easy to install and adjust.
2. This device rotation accuracy is high: compared with the traditional gear ring and rack turntable, the linear lead screw has the advantages that the processing precision of the linear lead screw is far higher than that of an arc gear ring, and the rotation precision of the device is easy to improve.
3. The device has large load: the invention can realize high-precision rotation under the load of 400 kg.
4. The device has high reliability: most of the parts adopted by the invention are standard parts, and the invention has simple structure, no over-positioning and under-positioning on the whole and can work efficiently and reliably for a long time.
5. This device is with low costs: compared with the traditional gear ring rack turntable, the gear ring rack turntable has the advantages that the linear driving is adopted to realize the circular arc rotation, and the processing cost caused by the circular arc guide rail and the circular arc rack is reduced.
The turntable system is compact in structure, self-locking is formed through the combined action of the slide block, the inclined plane of the lead screw and the motor reducer during locking, and locking is reliable.
The above description is only a preferred embodiment of the present invention, but not intended to limit the present invention, and all the modifications and variations of the above embodiments according to the present invention are within the scope of the present invention.
Claims (10)
1. A high-precision turntable system driven by a lead screw in a linear mode is characterized by comprising an optical platform, a turntable supporting assembly, a turntable platform, a turntable transmission sliding block mechanism, a turntable lead screw connecting assembly, a turntable lead screw power assembly, a turntable supporting guide rail connecting assembly, a turntable supporting guide rail tool, a turntable limiting column, a platform limiting column and a turntable lead screw tool;
the turntable supporting assembly is positioned between the turntable platform and the optical platform and is fixedly connected with the turntable platform and the optical platform respectively, the turntable supporting assembly is a shafting system, a first main shaft is arranged on the turntable supporting assembly, a groove is formed in the turntable platform, and the first main shaft of the turntable supporting assembly is inserted into the groove in the turntable platform and is used for being in clearance fit with the turntable platform;
the turntable transmission sliding block mechanism is fixedly connected with the turntable platform, the turntable lead screw connecting assembly and the turntable support guide rail connecting assembly respectively;
the number of the turntable transmission sliding block mechanisms is at least three, each turntable transmission sliding block mechanism is arranged between the turntable platform and the optical platform, and each turntable transmission sliding block mechanism consists of a linear guide rail and a sliding block;
the guide rail of the turntable transmission sliding block mechanism is fixedly connected with the turntable platform, and the sliding block of the turntable transmission sliding block mechanism is respectively and fixedly connected with the turntable lead screw connecting assembly and the turntable support guide rail connecting assembly;
the turntable screw power assembly is a power device comprising a screw, a motor and a speed reducer;
the turntable support guide rail is a linear guide rail;
the turntable support guide rail connecting assembly is a shafting system;
the turntable support guide rail tool is fixedly connected with the turntable support guide rail and is fixed on the optical platform;
at least one cross section of the turntable support guide rail tool is rectangular, and a threaded hole and a counter bore are formed in the turntable support guide rail tool;
the rotary table screw rod tool is fixedly connected with the rotary table screw rod power assembly and is fixed on the optical platform;
the platform limiting column is fixedly connected with the optical platform;
the turntable limiting column is fixedly connected with the turntable platform and is arranged on the turntable platform.
2. The lead screw linear drive high precision turntable system of claim 1, wherein the turntable support assembly is a shafting system consisting of a first main shaft, a first thrust ball bearing, a first deep groove ball bearing, a first circlip, a first encoder and a first bearing seat.
3. The lead screw linear drive high precision turntable system of claim 1, wherein the turntable lead screw connection assembly is a shafting system comprising at least a second bearing block, a second deep groove ball bearing, a shaft, a second circlip and an end cover.
4. The lead screw linear drive high precision turntable system of claim 1, wherein the turntable support rail connection assembly is a shafting system comprising at least a third bearing seat, a third thrust ball bearing, a third deep groove ball bearing and a third circlip.
5. The lead screw linear driving high-precision rotary table system according to claim 1, wherein the rotary table limiting column is a two-section stepped cylinder consisting of a small cylinder and a large cylinder, the small cylinder is provided with a thread, and the large cylinder is radially provided with a through hole.
6. The lead screw linear driven high precision turntable system of claim 1, wherein said turntable lead screw power assembly is disposed parallel to said turntable support rail assembly.
7. The lead screw linear driven high precision turntable system of claim 1, wherein said turntable drive slide is disposed perpendicular to said turntable lead screw and said turntable drive slide is disposed perpendicular to said turntable support rail assembly.
8. The lead screw linear drive high precision turntable system of claim 1, wherein an encoder is provided on the turntable support assembly, the encoder of the turntable support assembly and the motor of the turntable lead screw power assembly forming a closed loop control.
9. The lead screw linear drive high precision turntable system of claim 1, wherein the turntable limit post collides with the platform limit post when the slider of the turntable drive slider mechanism slides to the extreme positions on both sides.
10. The lead screw linear drive high precision turntable system of claim 1, wherein the turntable platform has a range of rotation of-18 ° to +18 °.
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| CN202111568849.5A CN114393553B (en) | 2021-12-21 | 2021-12-21 | High-precision turntable system driven by lead screw in straight line |
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| CN202111568849.5A CN114393553B (en) | 2021-12-21 | 2021-12-21 | High-precision turntable system driven by lead screw in straight line |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200900193A (en) * | 2007-06-20 | 2009-01-01 | Univ Chung Yuan Christian | Rotary table in limited rotation |
| CN107101793A (en) * | 2017-06-14 | 2017-08-29 | 苏州直为精驱控制技术有限公司 | Multi-direction motion platform |
| CN108602628A (en) * | 2016-12-13 | 2018-09-28 | 平田机工株式会社 | Turntable |
| CN209793646U (en) * | 2019-03-13 | 2019-12-17 | 长春光华微电子设备工程中心有限公司 | high-precision large-stroke high-bearing two-dimensional platform |
-
2021
- 2021-12-21 CN CN202111568849.5A patent/CN114393553B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200900193A (en) * | 2007-06-20 | 2009-01-01 | Univ Chung Yuan Christian | Rotary table in limited rotation |
| CN108602628A (en) * | 2016-12-13 | 2018-09-28 | 平田机工株式会社 | Turntable |
| CN107101793A (en) * | 2017-06-14 | 2017-08-29 | 苏州直为精驱控制技术有限公司 | Multi-direction motion platform |
| CN209793646U (en) * | 2019-03-13 | 2019-12-17 | 长春光华微电子设备工程中心有限公司 | high-precision large-stroke high-bearing two-dimensional platform |
Non-Patent Citations (1)
| Title |
|---|
| 徐新行;李莹;: "可见光电视用高精度小体积调焦平台的设计", 光学精密工程, no. 06, 15 June 2017 (2017-06-15) * |
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