CN104477409B - Realize device and the method for three axle turntable single shafts - Google Patents
Realize device and the method for three axle turntable single shafts Download PDFInfo
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- CN104477409B CN104477409B CN201410731164.1A CN201410731164A CN104477409B CN 104477409 B CN104477409 B CN 104477409B CN 201410731164 A CN201410731164 A CN 201410731164A CN 104477409 B CN104477409 B CN 104477409B
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Abstract
A kind of device and method realizing three axle turntable single shafts, this device realizing three axle turntable single shafts comprises some pitching framework locating devices, some driftage framework locating devices, some pitching framework setting devices, and framework formula water level gauge, pitching framework locating device is utilized to be connected and fixed three axle turntable outer supports and three axle turntable pitching frameworks, fixing and vertical fixing for realizing the level of three axle turntable pitching frameworks, driftage framework locating device is utilized to be connected and fixed three axle turntable pitching frameworks and three axle turntables driftage framework, for realizing the fixing of three axle turntable driftage frameworks, pitching framework setting device is utilized to connect three axle turret base, and contact three axle turntable pitching frameworks, for righting three axle turntable pitching framework, assist to realize the vertical fixing of three axle turntable pitching frameworks. positioning precision height of the present invention, can greatly reduce development cost, shorten the lead time, it is to increase plant factor.
Description
Technical field
The present invention relates to a kind of device and the method that realize three axle turntable single shafts.
Background technology
Three axle turntables are widely used in the research field such as aviation, navigation, outfield test can be substituted in laboratory environment and reappear the dynamicss such as naval vessels in real time, the rolling in space of real time modelling subjects, pitching and driftage attitude motion, development and production play an important role, have test accuracy height, economic performance height, by advantages such as external interference are little. The abundant Hardware-in-loop Simulation Experimentation of product on three axle turntables can improve the success ratio of product outfield test greatly, greatly reduces product development cost. Relevant statistics shows, guided missile Hardware-in-loop Simulation Experimentation can reduce throw-off practice number of times 30%��60%, save research fund 10%��40%, shorten the lead time 30%��40%, therefore semi-matter simulating system, the development of the nucleus equipment especially comprising three axle turntables is more and more subject to most attention.
At present, the relevant development and production unit of China's aircraft product has customized three many axle turntables, for the ground Hardware-in-loop Simulation Experimentation of aircraft, achieves good test effect. But the difference in view of each Project R&D mission requirements, some model task needs the 3 d pose motion of the rolling of real time modelling product, pitching and driftage; And some model task only needs to use single shaft turntable can meet test requirements document, the usual way in this situation customizes new single shaft turntable for test of products. So just cause the waste of functions of the equipments, reduce plant factor, also improve development cost.
Summary of the invention
The present invention provides a kind of device and the method that realize three axle turntable single shafts, positioning precision height, can greatly reduce development cost, shorten the lead time, it is to increase plant factor.
In order to achieve the above object, the present invention provides a kind of device realizing three axle turntable single shafts, and this device realizing three axle turntable single shafts comprises some pitching framework locating devices, some driftage framework locating devices, some pitching framework setting devices and framework formula water level gauge;
Described pitching framework locating device is connected and fixed three axle turntable outer supports and three axle turntable pitching frameworks, fixing and vertical fixing for realizing the level of three axle turntable pitching frameworks;
Described driftage framework locating device is connected and fixed three axle turntable pitching frameworks and three axle turntables driftage framework, for realizing the fixing of three axle turntable driftage frameworks;
Described pitching framework setting device connects three axle turret base, and contacts three axle turntable pitching frameworks, for righting three axle turntable pitching framework, assists to realize the vertical fixing of three axle turntable pitching frameworks;
Described framework formula water level gauge is fixedly mounted on three axle turntable worktable by water level gauge retaining plate, for leveling.
Described pitching framework locating device comprises:
Pitching framework location seat, it is arranged on three axle turntable outer supports, and this pitching framework location seat has internal taper hole;
Pitching framework location key seat, it is arranged on three axle turntable pitching frameworks;
Pitching framework steady brace, it is arranged in pitching framework location key seat, is threaded with pitching framework location key seat, and the cone head of this pitching framework steady brace screws in pitching framework location seat;
Pitching framework set nut, it is arranged on pitching framework steady brace, is threaded with pitching framework steady brace, locking pitching framework steady brace.
Described driftage framework locating device comprises:
Driftage framework location seat, it is arranged on three axle turntable driftage frameworks, and this driftage framework location seat has internal taper hole;
Driftage framework location key seat, it is arranged on three axle turntable pitching frameworks;
Driftage framework steady brace, it is arranged in driftage framework location key seat, and the cone head of this driftage framework steady brace screws in driftage framework location seat;
Driftage framework set nut, it is set on driftage framework steady brace, locking driftage framework steady brace.
Described pitching framework setting device comprises:
Adjusting pole, it is arranged in three axle turret base;
Universal adjustment supports, and it is arranged on adjusting pole, for righting three axle turntable pitching framework;
Setting device set nut, it is arranged on universal adjustment and supports, and locking universal adjustment supports.
The present invention also provides a kind of method realizing three axle turntable single shafts, and this method realizing three axle turntable single shafts comprises following step:
Step S0, framework formula water level gauge is arranged on three axle turntable worktable;
Step S1, pitching framework locating device is utilized to be horizontally fixed on three axle turntable outer supports by three axle turntable pitching frameworks;
Three axle turntables driftage frameworks are fixed on the three axle turntable pitching frameworks being horizontally fixed on three axle turntable outer supports by step S2, utilization driftage framework locating device;
Level between three axle turntable pitching frameworks and three axle turntable outer supports is fixed by step S3, releasing pitching framework locating device;
Step S4, pitching framework setting device is utilized to assist to realize the vertically orient of three axle turntable pitching frameworks;
Step S5, pitching framework locating device is utilized to be vertically fixed on three axle turntable outer supports by three axle turntable pitching frameworks.
Described step S1 comprises following step:
Step S1.1, regulate three axle turntable pitching frameworks, make the bubble in framework formula water level gauge be in the mid-way of Y-axis, that is, make three axle turntable pitching frameworks be in horizontality, make turntable yaw axes be parallel to ground;
Step S1.2, by pitching framework locate seat be arranged on three axle turntable outer supports, pitching framework location key seat is arranged on three axle turntable pitching frameworks;
Step S1.3, pitching framework steady brace is arranged in pitching framework location key seat, and the cone head of pitching framework steady brace is screwed in the internal taper hole of pitching framework location seat.
Described step S2 comprises following step:
Bubble in step S2.1, conditioning box posture water level gauge is in the mid-way of X axis, that is, three axle turntable pitching frameworks keep horizontality constant;
Step S2.2, driftage framework location key seat is arranged on three axle turntable pitching frameworks, driftage framework is located seat and is arranged on three axle turntables driftage frameworks;
Step S2.3, driftage framework steady brace is arranged on driftage framework location key seat in, and by driftage framework steady brace cone head screw in driftage framework location seat internal taper hole.
Described step S3 comprises following step: the internal taper hole that pitching framework steady brace goes out pitching framework location seat.
Described step S4 comprises following step:
Step S4.1, make three axle turntable pitching framework 90-degree rotations, make three axle turntable pitching frameworks turn into vertical state from horizontality, make turntable yaw axes be perpendicular to ground;
Step S4.2, the both sides that pitching framework setting device symmetry is arranged on three axle turret base, make the universal support seat on pitching framework setting device contact three axle turntable pitching frameworks;
Universal support seat on step S4.3, adjustment pitching framework setting device, makes the bubble in framework formula water level gauge be in the mid-way of Y-axis, that is, three axle turntable pitching frameworks keep vertical state constant.
Described step S5 comprises following step:
Step S5.1, when the bubble position in framework formula water level gauge is not dynamic, namely, three axle turntable pitching frameworks keep vertical state constant, then pitching framework is located seat and be arranged on three axle turntable outer supports, be arranged on by pitching framework location key seat on three axle turntable pitching frameworks;
Step S5.2, pitching framework steady brace is arranged in pitching framework location key seat, and screws in the internal taper hole of pitching framework location seat.
The present invention has the following advantages:
1, the present invention carries out single shaft transformation on existing three axle turntable bases, can greatly reduce development cost, shorten the lead time.
2, the present invention adopts cone head and internal taper hole to coordinate location, positioning precision height.
3, the present invention adopt steady brace and pitching framework setting device with the use of, it is possible to improve positioning precision and the system stiffness of three axle turntable pitching frameworks.
4, the present invention can realize three axle turntables and single shaft turntable and exchanges and use, it is to increase plant factor.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the present invention three axle turntable pitching framework horizontal adjustment.
Fig. 2 is the schematic diagram of the present invention three axle turntable driftage framework horizontal adjustment.
Fig. 3 is the schematic diagram of the present invention three axle turntable pitching framework vertical adjusting.
Fig. 4 is the rear view of Fig. 3.
Fig. 5 is the structural representation of pitching framework locating device of the present invention.
Fig. 6 is that the present invention goes off course the structural representation of framework locating device.
Fig. 7 is the structural representation of pitching framework setting device of the present invention.
Embodiment
The following better embodiment that the present invention is specifically described according to Fig. 1��Fig. 7.
As shown in Figure 1 to 4, the present invention provides a kind of device realizing three axle turntable single shafts, and this device comprises some pitching framework locating devices 3, some driftage framework locating devices 7, some pitching framework setting devices 10 and framework formula water level gauge 4.
Described pitching framework locating device 3 is connected and fixed three axle turntable outer support 1 and three axle turntable pitching frameworks 2, fixing and vertical fixing for realizing the level of three axle turntable pitching frameworks.
Described driftage framework locating device 7 is connected and fixed three axle turntable pitching frameworks 2 and three axle turntables driftage framework 8, for realizing the fixing of three axle turntable driftage frameworks.
Described pitching framework setting device 10 connects three axle turret base 9, and contacts three axle turntable pitching frameworks 2, for righting three axle turntable pitching framework, assists to realize the vertical fixing of three axle turntable pitching frameworks.
Described framework formula water level gauge 4 is fixedly mounted on three axle turntable worktable 6 by water level gauge retaining plate 5, for leveling.
As shown in Figure 5, described pitching framework locating device 3 comprises:
Pitching framework location seat 11, it is arranged on three axle turntable outer supports 1, and this pitching framework location seat 11 has internal taper hole;
Pitching framework location key seat 13, it is arranged on three axle turntable pitching frameworks 2;
Pitching framework steady brace 12, it is arranged in pitching framework location key seat 13, is threaded with pitching framework location key seat 13, and the cone head of this pitching framework steady brace 12 screws in pitching framework location seat 11;
Pitching framework set nut 14, it is arranged on pitching framework steady brace 12, is threaded with pitching framework steady brace 12, locking pitching framework steady brace 12.
As shown in Figure 6, described driftage framework locating device 7 comprises:
Driftage framework location seat 19, it is arranged on three axle turntable driftage frameworks 8, and this driftage framework location seat 19 has internal taper hole;
Driftage framework location key seat 18, it is arranged on three axle turntable pitching frameworks 2;
Driftage framework steady brace 15, it is arranged in driftage framework location key seat 18, and the cone head of this driftage framework steady brace 15 screws in driftage framework location seat 19;
Driftage framework set nut 23, it is set on driftage framework steady brace 15, locking driftage framework steady brace 15.
As shown in Figure 7, described pitching framework setting device 10 comprises:
Adjusting pole 20, it is arranged in three axle turret base 9;
Universal adjustment supports 22, and it is arranged on adjusting pole 20, for righting three axle turntable pitching framework 2;
Setting device set nut 21, it is arranged on universal adjustment and supports on 22, and locking universal adjustment supports 22.
As shown in Fig. 1��Fig. 7, the present invention also provides a kind of method realizing three axle turntable single shafts, comprises following step:
Step S0, framework formula water level gauge 4 is arranged on three axle turntable worktable 6, and utilizes water level gauge retaining plate 5 to be fixed framework formula water level gauge 4;
Step S1, pitching framework locating device 3 is utilized to be horizontally fixed on three axle turntable outer supports 1 by three axle turntable pitching frameworks 2;
Three axle turntables driftage frameworks 8 are fixed on the three axle turntable pitching frameworks 2 being horizontally fixed on three axle turntable outer supports 1 by step S2, utilization driftage framework locating device 7;
Level between three axle turntable pitching frameworks 2 and three axle turntable outer supports 1 is fixed by step S3, releasing pitching framework locating device 3;
Step S4, pitching framework setting device 10 is utilized to assist to realize the vertically orient of three axle turntable pitching frameworks 2;
Step S5, pitching framework locating device 3 is utilized to be vertically fixed on three axle turntable outer supports 1 by three axle turntable pitching frameworks 2.
As shown in Figure 1, described step S1 comprises following step:
Step S1.1, regulate three axle turntable pitching frameworks 2, make the bubble in framework formula water level gauge 4 be in the mid-way of Y-axis, that is, make three axle turntable pitching frameworks 2 be in horizontality, make turntable yaw axes be parallel to ground;
Step S1.2, by pitching framework locate seat 11 be arranged on three axle turntable outer supports 1, pitching framework location key seat 13 is arranged on three axle turntable pitching frameworks 2;
Step S1.3, pitching framework steady brace 12 is arranged in pitching framework location key seat 13, and the cone head of pitching framework steady brace 12 is screwed in the internal taper hole of pitching framework location seat 11.
As shown in Figure 2, described step S2 comprises following step:
Bubble in step S2.1, conditioning box posture water level gauge 4 is in the mid-way of X axis, that is, three axle turntable pitching frameworks 2 keep horizontality constant;
Step S2.2, driftage framework location key seat 18 is arranged on three axle turntable pitching frameworks 2, driftage framework is located seat 19 and is arranged on three axle turntables driftage frameworks 8;
Step S2.3, driftage framework steady brace 15 is arranged on driftage framework location key seat 18 in, and by driftage framework steady brace 15 cone head screw in driftage framework location seat 19 internal taper hole.
Described step S3 comprises following step:
Pitching framework steady brace 12 is screwed out the internal taper hole of pitching framework location seat 11.
As shown in Figure 3 and Figure 4, described step S4 comprises following step:
Step S4.1, make three axle turntable pitching framework 2 90-degree rotations, make three axle turntable pitching frameworks 2 turn into vertical state from horizontality, make turntable yaw axes be perpendicular to ground;
Step S4.2, the both sides that pitching framework setting device 10 symmetry is arranged on three axle turret base 9, make the universal adjustment on pitching framework setting device 10 support 22 contact three axle turntable pitching frameworks 2;
Universal adjustment on step S4.3, adjustment pitching framework setting device 10 supports 22, makes the bubble in framework formula water level gauge 4 be in the mid-way of Y-axis, that is, three axle turntable pitching frameworks 2 keep vertical state constant.
Described step S5 comprises following step:
Step S5.1, when the bubble position in framework formula water level gauge 4 is not dynamic, namely, three axle turntable pitching frameworks 2 keep vertical state constant, then pitching framework is located seat 11 and be arranged on three axle turntable outer supports 1, be arranged on by pitching framework location key seat 13 on three axle turntable pitching frameworks 2;
Step S5.2, pitching framework steady brace 12 is arranged in pitching framework location key seat 13, and screws in the internal taper hole of pitching framework location seat 11.
When three axle turntables need single shaftization to use, pitching framework setting device 10 and framework formula water level gauge 4 auxiliary under, utilizing pitching framework locating device 3 and driftage framework locating device 7 to fix three axle turntable pitching frameworks 2 and three axle turntables driftage framework 8 respectively, the single shaft that can realize three axle turntables uses. When needs use three axle turntable three shaft work energy, pitching framework locating device 3 and driftage framework locating device 7 are disengaged, and removes pitching framework setting device 10, three shaft work energy of three axle turntables can be recovered.
The present invention has the following advantages:
1, the present invention carries out single shaft transformation on existing three axle turntable bases, can greatly reduce development cost, shorten the lead time.
2, the present invention adopts cone head and internal taper hole to coordinate location, positioning precision height.
3, the present invention adopt steady brace and pitching framework setting device with the use of, it is possible to improve positioning precision and the system stiffness of three axle turntable pitching frameworks.
4, the present invention can realize three axle turntables and single shaft turntable and exchanges and use, it is to increase plant factor.
Although the content of the present invention has made detail by above preferred embodiment, but it should recognize that above-mentioned description is not considered as limitation of the present invention. After those skilled in the art have read foregoing, multiple amendment for the present invention and replacement will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. one kind realizes the device of three axle turntable single shafts, it is characterized in that, this device realizing three axle turntable single shafts comprises some pitching framework locating device (3), some driftages framework locating device (7), some pitching framework setting device (10) and framework formula water level gauge (4);
Described pitching framework locating device (3) is connected and fixed three axles turntable outer support (1) and three axles turntable pitching framework (2), fixing and vertical fixing for realizing the level of three axle turntable pitching frameworks;
Described driftage framework locating device (7) is connected and fixed three axles turntable pitching framework (2) and three axle turntables driftage framework (8), for realizing the fixing of three axle turntable driftage frameworks;
Described pitching framework setting device (10) connects three axle turret base (9), and contact three axles turntable pitching framework (2), for righting three axle turntable pitching framework, assist to realize the vertical fixing of three axle turntable pitching frameworks;
Described framework formula water level gauge (4) is fixedly mounted on three axles turntable worktable (6) by water level gauge retaining plate (5), for leveling.
2. realize the device of three axle turntable single shafts as claimed in claim 1, it is characterised in that, described pitching framework locating device (3) comprises:
Pitching framework location seat (11), it is arranged on three axles turntable outer support (1), and this pitching framework location seat (11) has internal taper hole;
Pitching framework location key seat (13), it is arranged on three axles turntable pitching framework (2);
Pitching framework steady brace (12), it is arranged in pitching framework location key seat (13), being threaded with pitching framework location key seat (13), the cone head of this pitching framework steady brace (12) screws in pitching framework location seat (11);
Pitching framework set nut (14), it is arranged in pitching framework steady brace (12), is threaded with pitching framework steady brace (12), locking pitching framework steady brace (12).
3. realize the device of three axle turntable single shafts as claimed in claim 1, it is characterised in that, described driftage framework locating device (7) comprises:
Driftage framework location seat (19), it is arranged on three axle turntables driftage framework (8), and this driftage framework location seat (19) has internal taper hole;
Driftage framework location key seat (18), it is arranged on three axles turntable pitching framework (2);
Driftage framework steady brace (15), it is arranged in driftage framework location key seat (18), and the cone head of this driftage framework steady brace (15) screws in driftage framework location seat (19);
Driftage framework set nut (23), it is set in driftage framework steady brace (15), locking driftage framework steady brace (15).
4. realize the device of three axle turntable single shafts as claimed in claim 1, it is characterised in that, described pitching framework setting device (10) comprises:
Adjusting pole (20), it is arranged in three axle turret base (9);
Universal adjustment supports (22), and it is arranged on adjusting pole (20), for righting three axle turntable pitching framework (2);
Setting device set nut (21), it is arranged on universal adjustment and supports on (22), and locking universal adjustment supports (22).
5. one kind utilizes the method that the device realizing three axle turntable single shafts as any one of in claim 1-4 realizes three axle turntable single shafts, it is characterised in that, this method realizing three axle turntable single shafts comprises following step:
Step S0, framework formula water level gauge (4) is arranged on three axles turntable worktable (6);
Step S1, pitching framework locating device (3) is utilized to be horizontally fixed on three axles turntable outer support (1) by three axles turntable pitching framework (2);
Three axle turntables driftage framework (8) are fixed on three axles turntable pitching framework (2) being horizontally fixed on three axles turntable outer support (1) by step S2, utilization driftage framework locating device (7);
Level between three axles turntable pitching framework (2) and three axles turntable outer support (1) is fixed by step S3, releasing pitching framework locating device (3);
Step S4, pitching framework setting device (10) is utilized to assist to realize the vertically orient of three axles turntable pitching framework (2);
Step S5, pitching framework locating device (3) is utilized to be vertically fixed on three axles turntable outer support (1) by three axles turntable pitching framework (2).
6. realize the method for three axle turntable single shafts as claimed in claim 5, it is characterised in that, described step S1 comprises following step:
Step S1.1, regulate three axles turntable pitching framework (2), the bubble in framework formula water level gauge (4) is made to be in the mid-way of Y-axis, that is, make three axles turntable pitching framework (2) be in horizontality, make turntable yaw axes be parallel to ground;
Step S1.2, by pitching framework locate seat (11) be arranged on three axles turntable outer support (1), pitching framework location key seat (13) is arranged on three axles turntable pitching framework (2);
Step S1.3, pitching framework steady brace (12) is arranged in pitching framework location key seat (13), and the cone head of pitching framework steady brace (12) is screwed in the internal taper hole of pitching framework location seat (11).
7. realize the method for three axle turntable single shafts as claimed in claim 5, it is characterised in that, described step S2 comprises following step:
Bubble in step S2.1, conditioning box posture water level gauge (4) is in the mid-way of X axis, that is, three axles turntable pitching framework (2) keep horizontality constant;
Step S2.2, framework location key seat (18) of going off course are arranged on three axles turntable pitching framework (2), and framework of going off course location seat (19) is arranged on three axle turntables driftage framework (8);
Step S2.3, framework steady brace (15) of going off course are arranged in driftage framework location key seat (18), and the cone head of framework steady brace (15) of going off course screws in the internal taper hole of driftage framework location seat (19).
8. realize the method for three axle turntable single shafts as claimed in claim 5, it is characterised in that, described step S3 comprises following step: the internal taper hole that pitching framework steady brace (12) screws out pitching framework location seat (11).
9. realize the method for three axle turntable single shafts as claimed in claim 5, it is characterised in that, described step S4 comprises following step:
Step S4.1, make three axle turntable pitching framework (2) 90-degree rotations, make three axles turntable pitching framework (2) turn into vertical state from horizontality, make turntable yaw axes be perpendicular to ground;
Step S4.2, the both sides that pitching framework setting device (10) symmetry is arranged on three axle turret base (9), make the universal adjustment in pitching framework setting device (10) support (22) and contact three axles turntable pitching framework (2);
Universal adjustment in step S4.3, adjustment pitching framework setting device (10) supports (22), the bubble in framework formula water level gauge (4) is made to be in the mid-way of Y-axis, that is, three axles turntable pitching framework (2) keep vertical state constant.
10. realize the method for three axle turntable single shafts as claimed in claim 5, it is characterised in that, described step S5 comprises following step:
Step S5.1, when the bubble position in framework formula water level gauge (4) is not dynamic, namely, three axles turntable pitching framework (2) keep vertical state constant, then pitching framework being located seat (11) is arranged on three axles turntable outer support (1), pitching framework location key seat (13) is arranged on three axles turntable pitching framework (2);
Step S5.2, pitching framework steady brace (12) is arranged in pitching framework location key seat (13), and screws in the internal taper hole of pitching framework location seat (11).
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| CN201410731164.1A CN104477409B (en) | 2014-12-05 | 2014-12-05 | Realize device and the method for three axle turntable single shafts |
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| CN201410731164.1A CN104477409B (en) | 2014-12-05 | 2014-12-05 | Realize device and the method for three axle turntable single shafts |
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| CN104477409B true CN104477409B (en) | 2016-06-08 |
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| CN107907154B (en) * | 2017-11-15 | 2019-09-10 | 北京无线电测量研究所 | A kind of large-scale band temperature control box three axis horizontal revolving tables of high-precision |
| CN108799744A (en) * | 2018-07-20 | 2018-11-13 | 中国航空工业集团公司北京航空精密机械研究所 | A kind of compound frame structures of UO-T for turntable |
| CN112664588B (en) * | 2020-12-21 | 2022-08-09 | 中国航空工业集团公司北京航空精密机械研究所 | Locking device for rotary table frame |
| CN112762964B (en) * | 2021-01-27 | 2024-03-15 | 广州小马智行科技有限公司 | Calibration method, device and system of inertia measurement unit of automatic driving vehicle |
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| CN201611261U (en) * | 2009-11-26 | 2010-10-20 | 陕西宝成航空仪表有限责任公司 | Vertical and horizontal dual-purpose mounting base of single-shaft testing rotary platform |
| CN101750099A (en) * | 2009-12-24 | 2010-06-23 | 中国科学院合肥物质科学研究院 | Calibration device for inclination angle sensor |
| KR20120063217A (en) * | 2010-12-07 | 2012-06-15 | 삼성전기주식회사 | Apparatus for apply multiaxial-inertial force |
| CN202421522U (en) * | 2012-01-19 | 2012-09-05 | 徐静 | Three-axis nonmagnetic turntable |
| CN203031571U (en) * | 2012-12-31 | 2013-07-03 | 北京微纳光科仪器有限公司 | Motor-driven three-shaft rotating platform |
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