CN205642735U

CN205642735U - Center mass measuring device

Info

Publication number: CN205642735U
Application number: CN201620344043.6U
Authority: CN
Inventors: 黄泉善
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-04-22
Filing date: 2016-04-22
Publication date: 2016-10-12
Anticipated expiration: 2026-04-22

Abstract

The utility model provides a center mass measuring device includes V type piece, its characterized in that of: the testee is installed on V type piece, V type piece is fixed on measuring platform, measuring platform upper end left side is provided with the frame level, measuring platform lower extreme middle part is fixed with the cross edge of a knife through the screw connection, the outer end of the cross edge of a knife meets through claw shape support frame and small -size automatically controlled elevating platform, measuring platform lower extreme left part is provided with high accuracy weighing sensor, high accuracy weighing sensor meets with small -size automatically controlled elevating platform, the lower extreme of small -size automatically controlled elevating platform is the supporting plane, the supporting plane is connected with vibration isolation optic platform through big elevating platform. This center mass measuring device has broken through the barycenter and has measured and uses the gravity axis as the traditional approach of benchmark, and it uses edge of a knife axis as the measurement object benchmark of barycenter, and the device has good uniformity, and measurement accuracy also obviously improves.

Description

A kind of center mass measuring device

Technical field

This utility model relates to mechanical measurement technique field, particularly to a kind of center mass measuring device.

Background technology

Traditional centroid measurement typically uses two kinds of methods, and one is many particles weighing method;Two is to use balance principle i.e. knife edge structure to weigh and calculate the distance i.e. unbalanced moments survey centroid method of the barycenter deviation edge of a knife.Both measuring methods all practicability and effectiveness, but all there is certain defect.Many particles weighing method employing 3 or multiple sensor directly weigh, owing to each sensor to carry the weight of about 1/3, the sensor that requirement journey is bigger.Sensors of large measurement range minimum division value data are corresponding relatively big, and mass center measurement precision is difficult to after reaching certain value continue to improve.Meanwhile, the method measuring basis is the gravity axis of the geometric centroid top by multiple sensor loads, and mechanism's processing is proposed high-precision requirement.Owing to cannot relative dimensions accurately be measured, the most stable measuring basis is caused to make certainty of measurement to improve.Traditional centroid measurement is all on the basis of gravity axis so that the benchmark of center-of-mass coordinate position becomes a learning concept, it is difficult to actual measurement.Out-of-balance force moments method uses balance principle i.e. knife edge structure to weigh and calculates the distance of the barycenter deviation edge of a knife, is affected with positioning precision owing to being measured sensor accuracy class by eccentric moment, and certainty of measurement is subject to certain restrictions, it is impossible to meet high-precision demand.

Summary of the invention

The purpose of this utility model is the problem in order to solve above-mentioned existence, and spy provides a kind of center mass measuring device.

This utility model provides a kind of center mass measuring device and includes V-block 2, it is characterized in that: testee is arranged on V-block 2, described V-block 2 is fixed on measuring table 3, it is provided with frame level 4 on the left of described measuring table 3 upper end, it is connected by screw in the middle part of described measuring table 3 lower end and is fixed with the cross edge of a knife 1, the outer end of the described cross edge of a knife 1 is connected with small-sized automatically controlled lifting platform 5 by claw type bracing frame 7, described measuring table 3 lower end left part is provided with high-precision weighing sensor 8, described high-precision weighing sensor 8 connects with small-sized automatically controlled lifting platform 5, the lower end of described small-sized automatically controlled lifting platform 5 is supporting plane 9, described supporting plane 9 is connected with vibration isolation optical table 10 by large lift platform 6.

Further, also include that grating scale displacement transducer 11, described grating scale displacement transducer 11 are fixed on vibration isolation optical table 10 by column.

Further, described small-sized automatically controlled lifting platform 5 is the EVS50-Z high accuracy lifting platform of close Instrument Ltd. of Nereid in the Tianrui of Beijing, and described small-sized automatically controlled lifting platform 5 is close-loop control mode, and load is 50 kilograms, and positioning precision is 3 microns.

Advantage of the present utility model: this center mass measuring device breaches centroid measurement traditional method on the basis of gravity axis, its objective benchmark of the measurement with edge of a knife axis as barycenter, device has good concordance, and certainty of measurement also significantly improves.

Accompanying drawing explanation

Below in conjunction with the accompanying drawings and this utility model is described in further detail by embodiment.

Fig. 1 is center mass measuring device theory structure schematic diagram.

Detailed description of the invention

A kind of center mass measuring device includes V-block 2, testee is arranged on V-block 2, V-block 2 is fixed on measuring table 3, measuring table 3 is provided with frame level 4 on the left of upper end, it is connected by screw in the middle part of measuring table 3 lower end and is fixed with the cross edge of a knife 1, the outer end of the cross edge of a knife 1 is connected with small-sized automatically controlled lifting platform 5 by claw type bracing frame 7, measuring table 3 lower end left part is provided with high-precision weighing sensor 8, high-precision weighing sensor 8 connects with small-sized automatically controlled lifting platform 5, this high-precision weighing sensor 8 is in addition to weighing, it is also possible to indirectly measure eccentric moment.The lower end of small-sized automatically controlled lifting platform 5 is supporting plane 9, and described supporting plane 9 is connected with vibration isolation optical table 10 by large lift platform 6.This center mass measuring device also includes that grating scale displacement transducer 11, described grating scale displacement transducer 11 are fixed on vibration isolation optical table 10 by column.

Small-sized automatically controlled lifting platform 5 is the EVS50-Z high accuracy lifting platform of close Instrument Ltd. of Nereid in the Tianrui of Beijing, and this lifting platform is close-loop control mode, and load is 50 kilograms, and positioning precision is 3 microns.Start and ending phase measuring, need the unloading mechanism that load is bigger, whole measuring table is held up together with measured object.Used here as the large lift platform 6 that load-carrying is big, large lift platform 6 has auto-lock function, can keep picking-up state for a long time.The load of large lift platform 6 is bigger, it is possible to be applied to the off-load of mechanism.Its load is 200 kilograms, and stroke is 100 millimeters, and control mode is open loop control mode.Frame level 4 ensures the levelness of measuring table 3, and grating scale displacement transducer 11 is used for measuring center displacement, and what light grating scale displacement transducer 11 was selected is, and the model that Czech ESSA produces is SM50 sensor.

During measurement, the landing of small-sized automatically controlled lifting platform 5 controls the work of the cross edge of a knife 1 on measuring table 3, the sensitivity of the cross edge of a knife 1 is the highest, and whole measurement system can swing around the cross edge of a knife 1 axis, and at this moment high-precision weighing sensor 8 can measure the force value data obtaining mechanical periodicity.So, it becomes possible to calculate the centroid position of measured object.

It is understandable that, above with respect to specific descriptions of the present utility model, it is merely to illustrate this utility model and is not limited to the technical scheme described by this utility model embodiment, it will be understood by those within the art that, still this utility model can be modified or equivalent, to reach identical technique effect；Needs are used, all within protection domain of the present utility model as long as meeting.

Claims

null1. a center mass measuring device includes V-block (2)，It is characterized in that: testee is arranged on V-block (2)，Described V-block (2) is fixed on measuring table (3)，Frame level (4) it is provided with on the left of described measuring table (3) upper end，It is connected by screw in the middle part of described measuring table (3) lower end and is fixed with the cross edge of a knife (1)，The outer end of the described cross edge of a knife (1) is connected with small-sized automatically controlled lifting platform (5) by claw type bracing frame (7)，Described measuring table (3) lower end left part is provided with high-precision weighing sensor (8)，Described high-precision weighing sensor (8) connects with small-sized automatically controlled lifting platform (5)，The lower end of described small-sized automatically controlled lifting platform (5) is supporting plane (9)，Described supporting plane (9) is connected with vibration isolation optical table (10) by large lift platform (6).
2. according to center mass measuring device described in claim 1, it is characterised in that: also include that grating scale displacement transducer (11), described grating scale displacement transducer (11) are fixed on vibration isolation optical table (10) by column.
3. according to center mass measuring device described in claim 1, it is characterized in that: described small-sized automatically controlled lifting platform (5) is the EVS50-Z high accuracy lifting platform of close Instrument Ltd. of Nereid in the Tianrui of Beijing, described small-sized automatically controlled lifting platform (5) is close-loop control mode, load is 50 kilograms, and positioning precision is 3 microns.