CN216207406U - Force measuring device and force control vibration test bed with same - Google Patents

Abstract

A force measuring device and a force control vibration test bed with the same comprise: the top surfaces of the square bodies are fixedly connected to the lower surface of the carrying table top; a first strain gauge is arranged on each first side surface of the plurality of square bodies, and a substrate of the first strain gauge is tightly attached to the first side surface; all the first side surfaces are positioned on the same plane or are parallel to each other; combining the dynamometer with a support, a vibration exciter and a vibration table board, designing a force-controlled vibration test table, driving the vibration table board to vibrate towards and away from the vibration exciter by the vibration exciter, wherein the bottom surfaces of a plurality of square bodies of the dynamometer can be fixed on the upper surface of the vibration table board, and the first side surface faces towards or away from the vibration exciter; according to the technical scheme provided by the utility model, the deformable cube and the strain gauge are combined, the strain generated by vibration is detected through the deformation of the strain gauge, and the magnitude of the force is further deduced, so that the vibration frequency is controlled, and the structure is simple and the efficiency is high.

Description

Force measuring device and force control vibration test bed with same

Technical Field

The utility model relates to the field of force measuring devices, in particular to a force measuring device and a force control vibration test bed with the same.

Background

The vibration test stand is a device for simulating the vibration resistance, reliability and integrity of the structure of a test piece. At present, the conventional vibration test bed controls and detects the vibration by adhering an acceleration sensor or a displacement sensor on a table top. With the development of test technology, in some vibration test processes, the dynamic characteristics of a test piece can change, the vibration spectrum type needs to be controlled through a force value, the loading requirement of displacement load is met while vibration excitation transmission is realized, and the mechanical property of the test piece is ensured to be checked in place. Thus, conventional vibration testing equipment cannot be realized.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a force measuring device and a force control vibration test bed with the same, so as to solve the problems.

The technical scheme adopted by the utility model is as follows:

a force-measuring device, comprising:

the top surfaces of the square bodies are fixedly connected to the lower surface of the carrying table top;

a first strain gauge is arranged on each first side surface of the plurality of square bodies, and a substrate of the first strain gauge is tightly attached to the first side surface;

all the first sides are in the same plane or parallel to each other.

Further specifically, a plurality of through holes are formed in the square body and penetrate through two opposite second side surfaces of the square body respectively, wherein the second side surfaces are adjacent to the first side surfaces.

Further specifically, the through holes are symmetrically distributed by taking a center line of the second side surface as an axis, and the center line extends along the vertical direction.

Further specifically, the through hole is shaped like a cylinder, and an extension line of the cylinder extends in the horizontal direction and is parallel to the first side surface.

Further specifically, the through hole is a cylinder or a square column.

More specifically, in the square body, a second strain gauge is provided on a third side surface opposite to the first side surface, and a base of the second strain gauge is in close contact with the third side surface.

Further specifically, the top and the bottom of the first side surface are both provided with flanges extending outwards, and the top and the bottom of the third side surface are both provided with flanges extending outwards;

the top surface and the bottom surface of the square body are both provided with fixing holes.

Further specifically, the number of the cubes is not less than 3, and the cubes are uniformly distributed along a circumference.

Further specifically, a force control vibration test bench includes:

the device comprises a support, a vibration exciter, a vibration table and the dynamometer;

the vibration exciter is installed on the support, the movable coil of vibration exciter orientation when shaking the mesa, the movable coil of vibration exciter can drive the vibration mesa is done the orientation and is kept away from the vibration of vibration exciter, the bottom surface of a plurality of cubes of ergograph can be fixed in the upper surface of vibration mesa, and first side orientation or keep away from the vibration exciter.

Further specifically, a fixing piece is arranged on the vibration table top, and the square body is installed on the vibration table top through the fixing piece.

The utility model has the following beneficial effects:

according to the technical scheme provided by the utility model, the deformable cube and the strain gauge are combined, the strain generated by vibration is detected through the deformation of the strain gauge, and the magnitude of the force is further deduced, so that the vibration frequency is controlled, and the structure is simple and the efficiency is high.

Drawings

FIG. 1 is a schematic view of a cube structure;

FIG. 2 is a right side view of the cube;

FIG. 3 is a schematic diagram of a square structure when the through hole is square;

FIG. 4 is a schematic structural diagram of a force-controlled vibration test bed;

fig. 5 is a schematic diagram of a force-measuring device.

Wherein: 1-carrying table surface, 2-cube, 3-first strain gauge, 4-second strain gauge, 5-through hole, 6-fixing hole, 7-support, 8-vibration exciter, 9-vibrating table surface, 10-connector, 11-fixing piece, F1-first side surface, F2-second side surface, and F3-third side surface.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.

If the utility model is described in terms of orientations (e.g., up, down, left, right, front, back, outside, inside, etc.), the orientation involved needs to be defined, for example, "for clarity of presentation of the positions and orientations described within the utility model, with reference to the operator of the instrument, the end proximal to the operator being the proximal end and the end distal to the operator being the distal end. "or defined with reference to the paper surface, the refrigerator depth direction, and the like. Of course, if the positional relationship between the two is defined by cross-reference at the time of the subsequent description, it may not be defined here.

The utility model provides a force measuring device, which measures the external force to which the force measuring device is subjected through a combination of a square body 2 and a strain gauge. Strain gauges are generally provided on the surface of an object to be measured, and when the stress in the object to be measured changes, the strain gauges are deformed in synchronization with each other, and after the deformation, the change in the geometric dimension and the resistivity of the material of the strain gauges reflects the amount of strain in the object to be measured.

As shown in fig. 1 and 2, a surface on which the first strain gauge 3 is disposed is defined as a first side surface F1, a surface of the square body 2 opposite to the first side surface F1 is defined as a third side surface F3, and one of the surfaces of the square body 2 adjacent to the first side surface F1 is defined as a second side surface F2.

The "top" direction labeled in fig. 2 is defined as the top of cube 2, and the "bottom" direction is the bottom of cube 2.

With reference to fig. 1, 2 and 5, the force measuring device comprises a carrier surface 1 and a plurality of square bodies 2, wherein the top surfaces of the square bodies 2 are fixedly connected to the lower surface of the carrier surface 1;

the first side surfaces F1 of the square bodies 2 are provided with first strain gauges 3, and the bases of the first strain gauges 3 are tightly attached to the first side surfaces F1;

all the first sides F1 lie in planes which are identical or parallel to each other.

In use, the first side face F1 is perpendicular to the direction of the external force to which the first strain gauge 3 is subjected.

In order to increase the deformation and the measurability of the square body 2 in the stress direction and maintain larger rigidity in other directions, a plurality of through holes 5 are arranged on the square body 2, the through holes 5 respectively penetrate through two opposite second side surfaces F2 of the square body, and the second side surface F2 is adjacent to the first side surface F1.

In the present embodiment, the number of the through holes 5 is not limited, and may be one through hole 5 or a plurality of through holes 5.

Preferably, when the number of the through holes 5 is greater than one, the through holes 5 are symmetrically distributed by taking a center line of the second side surface F2 as an axis, and the center line extends in the vertical direction, so that the deformation and the stress are more uniform.

The through hole 5 is shaped like a cylinder, and the extension line of the cylinder extends along the horizontal direction and is parallel to the first side surface F1.

Preferably, the through hole 5 may be a cylinder or a square column, or a combination of a cylinder and a square column. In fig. 1, the through-hole 5 is a cylinder. In fig. 3, the through hole 5 is a square column. Both have good uniform force capacity.

In the square body 2, the second strain gauge 4 is provided on a third side surface F3 opposite to the first side surface F1, and the base of the second strain gauge 4 is in close contact with the third side surface F3. Two strain gauges are symmetrically arranged, so that the accuracy of force measurement can be improved.

The square body 2 is made of metal, the top and the bottom of the first side face F1 are provided with flanges extending outwards, the top and the bottom of the third side face F3 are provided with flanges extending outwards, the top face and the bottom face of the square body 2 are provided with fixing holes 6, the fixing holes 6 are used for fixing the square body 2 in position, and the fixing holes 6 are symmetrically distributed by taking the central line of the square body 2 as an axis.

The design that the middle part of the square body 2 is slightly narrower than the top part and the bottom part is beneficial to the deformation of the middle part, and the design of the flanging is beneficial to the fixation of the top part and the bottom part.

In order to make the structure more stable and the vibration force transmission more uniform, the number of the cubes 2 should be not less than 3 and all be uniformly distributed along a circumference.

In addition, based on the above force measuring device, the present invention further provides a force-controlled vibration test stand, as shown in fig. 4 and 5, the force-controlled vibration test stand including:

the device comprises a support 7, a vibration exciter 8, a vibration table 9 and the dynamometer;

the vibration exciter 8 is installed on the support 7, the moving coil of vibration exciter 8 is connected with vibration mesa 9 through horizontal connector 10, the moving coil orientation of vibration exciter 8 during vibration mesa 9, the moving coil of vibration exciter 8 can drive vibration mesa 9 is the orientation and is kept away from the horizontal vibration of vibration exciter 8, the first side F1 of ergograph is mutually perpendicular with the direction of motion of year mesa 1.

The vibration dynamometer is characterized in that a fixing piece 11 is arranged on the vibration workbench surface 9, the fixing piece 11 is a fixed foot stand, the bottom surfaces of the plurality of square bodies 2 of the dynamometer are installed on the upper surface of the vibration workbench surface 9 through the fixed foot stand, and the first side surface F1 faces to or is far away from the vibration exciter 8.

During operation, test piece 12 is installed on objective table 1, the movable coil of vibration exciter 8 passes through horizontal connector 10 drive vibration mesa 9 is the vibration of horizontal direction, and the motion of vibration mesa 9 drives the ergograph motion, and the motion of ergograph drives the motion rather than fixed connection's test piece 12, and at this moment, the dynamometry direction of strainometer is the horizontal direction, from this, can detect out the size of its atress.

The force measuring device provided by the utility model adopts the combination of the deformable square body 2 and the strain gauge, detects the strain generated by vibration through the deformation of the strain gauge, further deduces the magnitude of force, and controls the vibration frequency, and has simple structure and high efficiency.

Meanwhile, the force control vibration test bed provided by the utility model saves the manufacturing cost and space of the vibration test bed, reduces the time for replacing the test bed and has higher flexibility.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims (10)

1. A force-measuring device, comprising:

the top surfaces of the square bodies (2) are fixedly connected to the lower surface of the carrying table top (1);

a first strain gauge (3) is arranged on each first side surface of the plurality of square bodies (2), and a substrate of the first strain gauge (3) is tightly attached to the first side surface;

all the first sides are in the same plane or parallel to each other.

2. The force-measuring device of claim 1, wherein:

the square body (2) is provided with a plurality of through holes (5), the through holes (5) respectively penetrate through two opposite second side surfaces of the square body (2), and the second side surfaces are adjacent to the first side surfaces.

3. The force-measuring device of claim 2, wherein:

the through holes (5) are symmetrically distributed by taking the center line of the second side surface as an axis, and the center line extends along the vertical direction.

4. The force-measuring device of claim 2, wherein:

the through hole (5) is in the shape of a cylinder, and the extension line of the cylinder extends along the horizontal direction and is parallel to the first side face.

5. The force-measuring device of claim 4, wherein:

the through hole (5) is a cylinder or a square column.

6. The force-measuring device of claim 1, wherein:

in the square body (2), a second strain gauge (4) is arranged on a third side surface opposite to the first side surface, and a base of the second strain gauge (4) is tightly attached to the third side surface.

7. The force-measuring device of claim 6, wherein:

the top and the bottom of the first side face are both provided with flanges extending outwards, and the top and the bottom of the third side face are both provided with flanges extending outwards;

the top surface and the bottom surface of the square body (2) are both provided with fixing holes (6).

8. The force-measuring device of claim 1, wherein:

the number of the square bodies (2) is not less than 3, and the square bodies are uniformly distributed along a circumference.

9. A force controlled vibration test stand, comprising:

a support (7), an exciter (8), a vibrating table top (9) and a force-measuring device according to any one of claims 1 to 8;

install vibration exciter (8) on support (7), the moving coil orientation of vibration exciter (8) during vibration mesa (9), the moving coil of vibration exciter (8) can drive vibration mesa (9) are done the orientation and are kept away from the vibration of vibration exciter (8), the bottom surface of a plurality of cubes (2) of ergograph can be fixed in the upper surface of vibration mesa (9), and first side orientation or keep away from vibration exciter (8).

10. The force controlled vibration test stand of claim 9, wherein:

the vibrating table top (9) is provided with a fixing piece (11), and the square body (2) is installed on the vibrating table top (9) through the fixing piece (11).

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