CN114393553B - High-precision turntable system driven by lead screw in straight line - Google Patents
High-precision turntable system driven by lead screw in straight line Download PDFInfo
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- CN114393553B CN114393553B CN202111568849.5A CN202111568849A CN114393553B CN 114393553 B CN114393553 B CN 114393553B CN 202111568849 A CN202111568849 A CN 202111568849A CN 114393553 B CN114393553 B CN 114393553B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25H—WORKSHOP EQUIPMENT, e.g. FOR MARKING-OUT WORK; STORAGE MEANS FOR WORKSHOPS
- B25H1/00—Work benches; Portable stands or supports for positioning portable tools or work to be operated on thereby
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Abstract
The invention provides a screw linear driving high-precision turntable system which comprises an optical platform, a turntable support assembly, a turntable platform, a turntable transmission sliding block mechanism, a turntable screw rod connecting assembly, a turntable screw rod power assembly, a turntable support guide rail connecting assembly, a turntable support guide rail tool, a turntable limit column, a platform limit column and a turntable screw rod tool. The turntable system has compact structure, forms self-locking through the combined action of the slide block, the inclined plane of the screw rod and the motor reducer during locking, and is reliable in locking.
Description
Technical Field
The invention belongs to the technical field of turntables, and particularly relates to a high-precision turntable system driven by a lead screw in a straight line.
Background
The vacuum common light path can simulate the vacuum environment during on-orbit working, and eliminates the systematic error introduced by the vacuum air correction coefficient. Firstly, a solar absolute radiometer is used for measuring a solar simulated light source, then a vacuum common-path device is rotated, the same solar simulated 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 high-precision instruments, increasing the degree of freedom of a system, realizing high-precision repeated positioning and determining the accuracy of the incidence angle of the optical path of the vacuum common-path comparison device. Therefore, the improvement of the positioning precision of the turntable has important significance for improving the calibration precision of the space optical remote sensing instrument.
At present, a large-load turntable device mainly comprises two schemes of main shaft direct drive and gear ring and rack drive. The direct drive of the main shaft has higher requirements on motor moment and control, and the repeated positioning accuracy of the load is poor; the torque requirement of the gear ring and the rack is smaller, but the processing difficulty and the cost of the gear ring and the rack are higher, and the higher rotating precision requirement 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 straight line. In order to achieve the above purpose, the present invention adopts the following specific technical scheme:
A high-precision turntable system driven by a screw rod in a straight line comprises an optical platform, a turntable support assembly, a turntable platform, a turntable transmission sliding block mechanism, a turntable screw rod connecting assembly, a turntable screw rod power assembly, a turntable support guide rail connecting assembly, a turntable support guide rail tool, a turntable limit column, a platform limit column and a turntable screw rod tool;
The turntable support assembly is positioned between the turntable platform and the optical platform, the turntable support assembly is fixedly connected with the turntable platform and the optical platform respectively, the turntable support assembly is a shafting system, a first main shaft is arranged on the turntable support assembly, a groove is arranged on the turntable platform, and the first main shaft of the turntable support assembly is inserted into the groove on 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 screw rod connecting assembly and the turntable support guide rail connecting assembly respectively;
The turntable transmission slide block mechanisms are at least three groups, each group of turntable transmission slide block mechanisms is arranged between the turntable platform and the optical platform, and each group of turntable transmission slide block mechanisms consists of a linear guide rail and a slide block;
the guide rail of the turntable transmission slide block mechanism is fixedly connected with the turntable platform, and the slide block of the turntable transmission slide block mechanism is fixedly connected with the turntable screw rod connecting component and the turntable support guide rail connecting component respectively;
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 the turntable support guide rail tool is provided with a threaded hole and a counter bore;
The turntable screw rod tool is fixedly connected with the turntable 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 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.
Preferably, the turntable screw rod connecting assembly is a shafting system at least comprising a second bearing seat, a second deep groove ball bearing, a shaft, a second circlip and an end cover.
Preferably, the turntable support guide rail connection 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 circlip.
Preferably, the turntable limiting column is a two-section stepped column formed by a small column and a large column, the small column is provided with threads, and the large column is radially provided with a through hole.
Preferably, the turntable screw power assembly is placed in parallel with the turntable support rail assembly.
Preferably, the turntable transmission sliding mechanism is vertically arranged with the turntable screw rod, and the turntable transmission sliding mechanism is vertically arranged with the turntable support guide rail assembly.
Preferably, the rotary table supporting assembly is provided with an encoder, and the encoder of the rotary table supporting assembly and the motor of the rotary table screw power assembly form closed-loop control.
Preferably, when the slide blocks of the turntable transmission slide block mechanism slide to limit positions on two sides, the turntable limit posts collide with the platform limit posts.
Preferably, the turntable platform rotates in the range of-18 ° to +18°.
The invention can obtain the following technical effects:
The high-precision turntable driven by the lead screw in a straight line can realize high-precision rotation under the heavy load condition. The invention converts the circular arc 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 has compact structure, forms self-locking through the combined action of the slide block, the inclined plane of the screw rod and the motor reducer during locking, and is reliable in locking.
Drawings
FIG. 1 is a schematic view of a high precision turret linearly driven by a lead screw according to one embodiment of the invention;
FIG. 2 is a schematic cross-sectional view of a turntable support assembly according to one embodiment of the present invention;
FIG. 3 is a schematic view of a turntable platform according to one embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a turret screw connection assembly according to one embodiment of the invention;
FIG. 5 is a schematic cross-sectional view of a turntable support assembly according to one embodiment of the present invention;
FIG. 6 is a schematic view of a turret spacing post according to one embodiment of the invention;
FIG. 7 is a schematic view of a platform spacing post according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a high-precision turntable driven by a screw in a straight line according to an embodiment of the present invention.
The attached drawings are identified:
the turntable support assembly 1, the turntable platform 2, the turntable driving slide block mechanism 3, the turntable screw connection assembly 4, the turntable screw power assembly 5, the turntable support rail connection assembly 6, the turntable support rail 7, the turntable support rail fixture 8, the turntable limit post 9, the platform limit post 10, the turntable screw fixture 11, the optical platform 12, the first main shaft 101, the first thrust ball bearing 102, the first deep groove ball bearing 103, the first circlip 104, the first encoder 105, the first bearing seat 106, the second bearing seat 402, the second deep groove ball bearing 403, the second main shaft 401, the second circlip 404, the end cover 405, the third main shaft 601, the third thrust ball bearing 602, the third deep groove ball bearing 603, the third bearing seat 604 and the third circlip 605.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limiting the invention.
The invention aims to provide a high-precision turntable system driven by a screw rod in a straight line. The high-precision turntable system for linear driving of the screw rod provided by the invention is described in detail by a specific embodiment.
Fig. 1 shows a high-precision turntable system 100 with linear driving of a screw rod, which comprises an optical platform 12, a turntable support assembly 1, a turntable platform 2, a turntable transmission sliding block mechanism 3, a turntable screw rod connecting assembly 4, a turntable screw rod power assembly 5, a turntable support guide rail connecting 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 screw rod tool 11;
The turntable support assembly 1 is positioned between the turntable platform 2 and the optical platform 3, the turntable support assembly 1 is fixedly connected with the turntable platform 2 and the optical platform 12 respectively, the turntable support assembly 1 is a shafting system, a first main shaft is arranged on the turntable support assembly 1, a groove is arranged on the turntable platform, and the first main shaft of the turntable support assembly 1 is inserted into the groove on 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 screw rod connecting assembly 4 and the turntable support guide rail connecting assembly 6 respectively;
the turntable transmission slide block mechanisms 3 are at least three groups, each group of turntable transmission slide block mechanisms 3 is arranged between the turntable platform 2 and the optical platform 12, and each group of turntable transmission slide block mechanisms 3 consists of a linear guide rail and a slide block;
The guide rail of the turntable transmission slide block mechanism 3 is fixedly connected with the turntable platform 2, and the slide block of the turntable transmission slide block mechanism 3 is fixedly connected with the turntable screw rod connecting component 4 and the turntable support guide rail connecting component 6 respectively;
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 cuboid, and a threaded hole and a countersunk hole are formed in the turntable support guide rail tool 8;
the turntable screw rod tool 11 is fixedly connected with the turntable screw rod 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 circlip 104, a first encoder 105 and a first bearing seat 106; the first bearing seat 106 and the first main shaft 101 are connected with the first thrust ball bearing 102, the first deep groove ball bearing 103, the first circlip 104 and the first encoder 105 in sequence from top to bottom; a first thrust ball bearing 102 is placed over the first bearing seat 1106, the first axial support spindle 101, and locked for axial displacement by a first circlip 104. The middle of the first bearing seat 106 is used for placing the first deep groove ball bearing 103 and is connected with the first main shaft 101 to limit the radial displacement of the first main shaft 101. A first encoder 105 is arranged below the first bearing seat 106, fixedly connected with the first main shaft 101 and elastically connected with the first bearing seat 106.
As shown in fig. 3, the overall shape of the turntable platform 2 approaches a symmetrical triangle, and a circular groove is formed at one corner of the platform. As shown in fig. 1, the turntable transmission slide block mechanism 3 has three groups, which are all common linear guide rails with consistent length types, 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 rectangular and is provided with a threaded hole and a counter bore; the turntable screw rod tool 11 is in a cuboid shape, and is provided with a threaded hole and a countersunk hole; the optical bench 12 is a common optical bench, and threaded holes are uniformly arranged on the optical bench 12.
As shown in fig. 4, the turntable screw rod connection assembly 4 is a shafting system consisting of a second bearing seat 402, a second deep groove ball bearing 403, a second main shaft 401, a second circlip 404 and an end cover 405; the second bearing seat 402 is connected with 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 cap is mounted above the second bearing seat 402 and is not in contact with the second deep groove ball bearing 403; a second circlip 404 is mounted below the second bearing seat 402 to lock the second spindle 401 axially.
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 circlip 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 circlip 605 from top to bottom; a third thrust ball bearing 602 is placed over the third bearing seat 604, axially supporting the third spindle 601 and locked against axial displacement by a third circlip 605. A third deep groove ball bearing 603 is disposed in the middle of the third bearing seat 604 and is connected to the third main shaft 601 to limit radial displacement of the third main shaft 601.
Preferably, the turntable limiting column 9 is a two-section stepped column formed by a small column and a large column, the small column is provided with threads, and the large column 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 is vertically arranged with the turntable screw rod connecting assembly 5, and the turntable transmission sliding mechanism 3 is vertically arranged with the turntable support guide rail connecting assembly 6.
Preferably, the turntable support assembly 1 is provided with a first encoder 105, and the first encoder 106 of the turntable support assembly 1 forms a closed-loop control with the motor of the turntable screw power assembly 5.
Preferably, when the slide block of the turntable transmission slide block mechanism 3 slides to two side limit positions, the turntable limit column 9 collides with the platform limit column 10.
Preferably, the turntable platform 2 has a rotation range of-18 ° to +18°.
The invention can obtain the following technical effects:
the high-precision turntable driven by the lead screw in a straight line can realize high-precision rotation under the heavy load condition. The invention converts the circular arc 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 driving to realize arc rotation, reduces the processing difficulty and processing cost of processing the arc guide rail and the arc rack, and simultaneously adopts linear driving to easily improve the rotation precision of the turntable.
As shown in fig. 8, h represents the displacement of the linear driving assembly, d represents the distance of the 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 common precision level, lead screw lead 6mm, repeated positioning precision 0.01mm, lead screw distance from the lead screw of the lead screw power assembly 5 to the turntable support assembly 1 700mm, motor step angle of the lead screw power assembly 5 1.8 degrees, reduction gear ratio of the speed reducer of the lead screw power assembly 530, motor reducer combination return error less than 5', absolute encoder 20 bits, encoder repeated positioning precision 15'.
Then there is turntable rotation accuracy:
the motor drives the precision of the lead screw under the condition of no subdivision to be:
1.8°÷360°÷30×6＝0.001mm (1)
the precision of the rotation of the turntable is as follows:
arctan(0.001/700)÷2π×360°＝0.000082° (1)
absolute encoder accuracy:
360°÷220＝0.000343° (5)
the turntable rotates to repeat the positioning precision:
the maximum precision influence of motor return error on the driving screw is as follows:
5'÷60'÷360°×6＝0.00139mm (2)
The repeated positioning precision of the lead screw guide rail power assembly is as follows
h＝0.01mm+0.00139mm＝0.01239mm (3)
Calculating the positioning precision of the turntable 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)
Thus, the rotational resolution and the repeated positioning accuracy of the lead screw turntable are mainly dependent on the choice of encoder accuracy. The turntable rotation precision of better than 0.0005 degrees can be realized by adopting the parameter encoder, and the repeated positioning precision of better than 0.005 degrees can be realized.
The invention has the characteristics of simple assembly and adjustment, high rotation precision, large load, high reliability and low cost, and is specifically described as follows:
1. The device is simple to install and adjust: the invention meets the requirement of the degree of freedom in the rotation process, has no over-positioning and under-positioning, has only one degree of rotation freedom, and is easy to install and regulate.
2. The device has high rotation precision: compared with the traditional gear ring and rack turntable, the linear screw machining precision of the invention far exceeds the machining precision of the circular 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 of rated 400kg load.
4. The device has high reliability: the parts adopted by the invention are mostly standard parts, and the invention has simple structure, no over-positioning and under-positioning of the whole body, and can work efficiently and reliably for a long time.
5. The device has low cost: compared with the traditional gear ring and rack turntable, the linear driving device realizes circular arc rotation by adopting linear driving, and reduces the processing cost brought by the circular arc guide rail and the circular arc rack.
The turntable system has compact structure, forms self-locking through the combined action of the slide block, the inclined plane of the screw rod and the motor reducer during locking, and is reliable in locking.
The foregoing description is only a preferred embodiment of the present invention, but is not limited thereto, and any simple modification or variation of the above-mentioned embodiment according to the present invention is still within the scope of the present invention.
Claims (10)
1. The high-precision turntable system is characterized by comprising an optical platform, a turntable support assembly, a turntable platform, a turntable transmission sliding block mechanism, a turntable screw rod connecting assembly, a turntable screw rod power assembly, a turntable support guide rail connecting assembly, a turntable support guide rail tool, a turntable limit column, a platform limit column and a turntable screw rod tool;
The turntable support assembly is positioned between the turntable platform and the optical platform, the turntable support assembly is fixedly connected with the turntable platform and the optical platform respectively, the turntable support assembly is a shafting system, a first main shaft is arranged on the turntable support assembly, a groove is arranged on the turntable platform, and the first main shaft of the turntable support assembly is inserted into the groove on 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 screw rod connecting assembly and the turntable support guide rail connecting assembly respectively;
The turntable transmission slide block mechanisms are at least three groups, each group of turntable transmission slide block mechanisms is arranged between the turntable platform and the optical platform, and each group of turntable transmission slide block mechanisms consists of a linear guide rail and a slide block;
the guide rail of the turntable transmission slide block mechanism is fixedly connected with the turntable platform, and the slide block of the turntable transmission slide block mechanism is fixedly connected with the turntable screw rod connecting component and the turntable support guide rail connecting component respectively;
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 the turntable support guide rail tool is provided with a threaded hole and a counter bore;
The turntable screw rod tool is fixedly connected with the turntable 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 screw linear drive high precision turntable system of claim 1, wherein the turntable support assembly is a shafting system consisting of a first spindle, a first thrust ball bearing, a first deep groove ball bearing, a first circlip, a first encoder, and a first bearing mount.
3. The screw linear drive high precision turntable system of claim 1, wherein the turntable screw connection assembly is a shafting system comprising at least a second bearing, a second deep groove ball bearing, a second spindle, a second circlip, and an end cap.
4. The 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 block, a third thrust ball bearing, a third deep groove ball bearing, and a third circlip.
5. The screw linear driving high-precision turntable system according to claim 1, wherein the turntable limiting column is a two-section stepped column consisting of a small column and a large column, the small column is provided with threads, and the large column is radially provided with a through hole.
6. The screw linear drive high precision turntable system of claim 1, wherein the turntable screw power assembly is disposed in parallel with the turntable support rail connection assembly.
7. The screw linear drive high precision turntable system of claim 1, wherein the turntable drive slider mechanism is disposed perpendicular to the turntable screw connection assembly and the turntable drive slider mechanism is disposed perpendicular to the turntable support rail connection assembly.
8. The screw linear drive high precision turntable system of claim 1, wherein the turntable support assembly has an encoder thereon, the encoder of the turntable support assembly forming a closed loop control with the motor of the turntable screw power assembly.
9. The screw linear drive high precision turntable system of claim 1, wherein the turntable stop post collides with the platform stop post when the slide of the turntable drive slide mechanism slides to both side limit positions.
10. The screw linearly driven high precision turntable system of claim 1, wherein the turntable platform has a range of rotation from-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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI323205B (en) * | 2007-06-20 | 2010-04-11 | Univ Chung Yuan Christian | Rotary table in limited rotation |
| CN108602628B (en) * | 2016-12-13 | 2020-05-15 | 平田机工株式会社 | Rotary table |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Non-Patent Citations (1)
| Title |
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| 可见光电视用高精度小体积调焦平台的设计;徐新行;李莹;;光学精密工程;20170615(06);全文 * |
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