CN215677383U - Six-dimensional force measuring platform - Google Patents

Abstract

The utility model discloses a six-dimensional force measuring platform, which comprises a square horizontal base; the force measuring device comprises a horizontal base, a force measuring platform and strain sensors, wherein the force measuring platform is connected with the horizontal base through the four strain sensors; the force measuring platform is characterized by further comprising a guard plate, wherein the guard plate is fixed on the periphery of the force measuring platform, and one end of the guard plate is connected with the horizontal base; the utility model has simple structure and high precision, and can realize the accurate measurement of the whole force measuring platform.

Description

Six-dimensional force measuring platform

Technical Field

The utility model relates to the field of high-precision sensors, in particular to a six-dimensional force measuring platform.

Background

In recent years, with the rapid development of aerospace technologies, the data precision requirement on equipment testing is gradually improved, and the common measurement mode cannot meet the current requirements, but at present, domestic sensor products generally have low reliability and poor performance precision, and are at a disadvantage in the competition of the global sensor industry.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, meet the relevant test requirements, formulate a six-dimensional force measuring system project, provide the technical requirements required by the test, ensure the feasibility of the product and enable the product to have the conditions for replacing the prior similar equipment, the utility model provides the following technical scheme: a six-dimensional force-measuring platform comprises a square horizontal base; the force measuring device comprises a horizontal base, a force measuring platform and strain sensors, wherein the force measuring platform is connected with the horizontal base through the four strain sensors; the force measuring platform is characterized by further comprising a guard plate, wherein the guard plate is fixed on the periphery of the force measuring platform, and a deformation gap is reserved between one end of the guard plate and the horizontal base.

Preferably, an expansion sleeve is arranged at the joint of the strain sensor, the force measuring platform and the horizontal base.

Preferably, the strain sensor comprises two cylindrical pressing blocks, and three sets of strain beams are fixed between the pressing blocks; the expansion sleeve fastening shaft is arranged at the position of the circle center outside the pressing block.

Preferably, the strain gauge sensor is fixed to the force measuring platform and the horizontal base by screws.

Preferably, the area of the horizontal base is larger than the area of the force measuring platform.

Compared with the prior art, the utility model has the following beneficial effects:

1. the utility model has the advantages of simple structure, low cost, high precision, wide measurement range, long service life and convenient installation.

2. The main material is F141 (00 Ni18Co8Mo5 TiAl) ultrahigh-strength steel, the tensile strength reaches 1862MPa, the sensor has the advantages of high strength, strong corrosion resistance and good mechanical property, can work under severe conditions, and is easy to realize miniaturization, integration and variety diversification in the aspect of structure.

3. The force measuring platform, the horizontal bottom plate and the sensor are fastened by using the upper and lower expansion sleeves, so that the rigidity of the whole force platform is improved; the force measuring platform and the horizontal base adopt a partial hollow design, so that the overall quality is reduced; thereby greatly increasing the natural frequency of the entire system.

Drawings

FIG. 1 is a top view of the overall structure of the present invention;

FIG. 2 is a cross-sectional view of the present invention;

FIG. 3 is a diagram of a sensor structure according to the present invention;

FIG. 4 is a schematic diagram of a plate output algorithm according to the present invention;

in the figure: the device comprises a horizontal base 1, a force measuring platform 2, a strain type sensor 3, a protective plate 4, an expansion sleeve 5, a pressing block 6, a strain beam 7, a screw 8 and an expansion sleeve fastening shaft 9.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-3, a six-dimensional force measuring platform, the main material of which is F141 (00 Ni18Co8Mo5 TiAl) ultra-high strength steel, the tensile strength of which reaches 1862Mpa, the structure of which comprises a square horizontal base 1; the device is characterized by further comprising a square force measuring platform 2, wherein the force measuring platform 2 is connected with the horizontal base 1 through four strain sensors 3, the strain sensors 3 are arranged at four corners of the force measuring platform 2, and accurate measurement is realized by placing an object to be measured on the force measuring platform 2 so as to be transmitted to the strain sensors 3; the force measuring platform further comprises a guard plate 4, wherein the guard plate 4 is fixed on the periphery of the force measuring platform 2, and a deformation gap is reserved between the lower end of the guard plate and the horizontal base 1.

In order to play a fastening role and improve the rigidity of the whole force platform, an expansion sleeve 5 is arranged at the joint of the strain sensor 3, the force measuring platform 2 and the horizontal base 1 and is fixed through a screw 8. The strain sensor 3 comprises two cylindrical pressing blocks 6, and three groups of strain beams 7 are fixed between the pressing blocks 6; still include two cover fastening shafts 9 that expand, cover fastening shaft 9 that expand set up in briquetting 6 outside centre of a circle department has ensured the stability of strain gauge sensor 3 assembly, and relative displacement can not produce for force measuring platform 2 when guaranteeing to measure, has improved measurement accuracy.

In order to ensure the stability of the force platform when the force platform is horizontally placed, the area of the horizontal base 1 is larger than that of the force measuring platform 2.

In conclusion, the six-dimensional force measuring platform consists of four strain sensors 3, a force measuring platform 2, a horizontal base 1 and a protective plate 4, wherein the four sensors are matched, fixed, symmetrical and uniformly distributed at four corners of the force measuring platform 2 through screws 8, pin holes and expansion sleeves 5. The object to be measured is placed above the force measuring platform 2, when the object to be measured is stressed, the strain sensor 3 is stressed to elastically deform, so that the strain beam generates strain, the resistance strain gauge adhered to the strain beam converts the stress of the object to be measured from the elastic strain into resistance change, the resistance change is converted into voltage output through a Wheatstone bridge circuit, the voltage output is obtained through a display instrument, and finally the stress condition of the object to be measured is generated through data analysis and processing.

Referring to FIG. 4, a single sensor directly obtains three force values X/Y/Z, and calculates the force value output of the plate:

the flat panel output algorithm:

there are 4 total sensors, numbered 1-4, each with XYZ three force results:

plate Fx = X1+ X2+ X3+ X4

Plate Fy = Y1+ Y2+ Y3+ Y4

Plate Fz = Z1+ Z2+ Z3+ Z4

Flat plate Mx = (Z1 + Z4-Z3-Z2) × Dy

Plate My = (Z4 + Z3-Z2-Z1) × Dx

Plate Mz = (X3+ X2-X1-X4) × Dy + (Y2+ Y1-Y4-Y3) × Dx

(wherein the reference distance is Dx =0.12 m, Dy =0.12 m)

In the measuring process, the magnitude of the force F and the moment M applied to the object stressed by the six-dimensional force measuring platform can be output by acquiring voltage signals of the four sensors and multiplying the voltage signals by a coefficient obtained after the sensors are calibrated.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (5)

1. A six-dimensional force-measuring platform comprises a square horizontal base (1); the method is characterized in that: the device is characterized by further comprising a square force measuring platform (2), wherein the force measuring platform (2) is connected with the horizontal base (1) through four strain sensors (3), and the strain sensors (3) are arranged at four corners of the force measuring platform (2); the force measuring platform is characterized by further comprising a protection plate (4), wherein the protection plate (4) is fixed on the periphery of the force measuring platform (2), and a deformation gap is reserved between one end of the protection plate and the horizontal base (1).

2. The six-dimensional force-measuring platform of claim 1, wherein: and an expansion sleeve (5) is arranged at the joint of the strain sensor (3) and the force measuring platform (2) and the horizontal base (1).

3. The six-dimensional force-measuring platform of claim 2, wherein: the strain sensor (3) comprises two cylindrical pressing blocks (6), and three groups of strain beams (7) are fixed between the pressing blocks (6); the expansion sleeve fastening device is characterized by further comprising two expansion sleeve fastening shafts (9), wherein the expansion sleeve fastening shafts (9) are arranged at the position of the outer circle center of the pressing block (6).

4. The six-dimensional force-measuring platform of claim 1, wherein: the strain sensor (3) is fixed with the force measuring platform (2) and the horizontal base (1) through screws (8).

5. The six-dimensional force-measuring platform of claim 1, wherein: the area of the horizontal base (1) is larger than that of the force measuring platform (2).

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