CN209745440U - Force sensor - Google Patents

Abstract

The utility model provides a force cell sensor, include: the cantilever beam structure is symmetrically arranged on two sides of the fixed mounting platform, two stress bosses are formed on the upper surface of the cantilever beam structure, strain gauges are respectively arranged on the upper surface and the lower surface of a cantilever of the cantilever beam structure, and the lower surfaces of the fixed mounting platform and the cantilever beam structure are reference mounting surfaces. To the four corners error problem that causes because mechanical structure's error and paster position are inaccurate, the utility model discloses can conveniently adjust through the wall thickness of the cantilever beam of revising both ends.

Description

Force sensor

Technical Field

The utility model relates to a sensor technical field, in particular to force cell sensor.

Background

The force transducer is a conventional transducer for detecting pressure in the prior art, but due to the error of a mechanical structure and the inaccurate position of a patch, a large eccentric error is generated on the surface of the force transducer in the environment of large-plane force measurement.

SUMMERY OF THE UTILITY MODEL

The utility model provides a force cell sensor to solve above-mentioned technical problem.

In order to solve the above problem, as an aspect of the present invention, there is provided a force sensor, comprising: the cantilever beam structure is symmetrically arranged on two sides of the fixed mounting platform, two stress bosses are formed on the upper surface of the cantilever beam structure, strain gauges are respectively arranged on the upper surface and the lower surface of a cantilever of the cantilever beam structure, and the lower surfaces of the fixed mounting platform and the cantilever beam structure are reference mounting surfaces.

Preferably, the cantilever beam structure is a dual-hole parallel beam structure.

Preferably, the center of the fixed mounting platform is provided with a space avoiding position.

Preferably, the area of the fixed mounting platform around the clearance is provided with a plurality of mounting holes.

Preferably, a mounting part recessed downward is formed on an upper surface of the fixed mounting platform.

Preferably, the upper surface of the fixed mounting platform is provided with a wire outlet hole and a wiring groove penetrating through the upper surface, and the wire outlet hole is communicated with the wiring groove.

Owing to adopted above-mentioned technical scheme, to the four corners error problem that causes because mechanical structure's error and paster position are inaccurate, the utility model discloses can conveniently adjust through the wall thickness of the cantilever beam of revising both ends.

Drawings

Fig. 1 schematically shows a perspective view of the present invention;

Figure 2 schematically illustrates a bottom view of the present invention;

Figure 3 schematically shows a side view of the invention;

Fig. 4 schematically shows a top view of the present invention;

fig. 5 schematically shows a use state diagram of the present invention.

Reference numbers in the figures: 1. fixing the mounting platform; 2. a cantilever beam structure; 3. a force-bearing boss; 4. a strain gauge; 5. avoiding vacant positions; 6. mounting holes; 7. an installation part; 8. a wire outlet hole; 9. a wiring groove; 10. a dual-hole parallel beam structure; 11. an upper module plate; 12. a lower fixing plate; 13. and a load cell.

Detailed Description

The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.

The utility model discloses an aspect provides a force cell sensor, include: the sensor comprises a fixed mounting platform 1 and a cantilever beam structure 2, wherein the cantilever beam structure 2 is symmetrically arranged on two sides of the fixed mounting platform 1, two stress bosses 3 are formed on the upper surface of the cantilever beam structure 2, strain gauges 4 are respectively arranged on the upper surface and the lower surface of a cantilever of the cantilever beam structure 2, the lower surfaces of the fixed mounting platform 1 and the cantilever beam structure 2 are used as reference mounting surfaces, a sensor is mounted by taking the surfaces as references, and the flatness of the mounting surfaces is required to be less than 0.02 mm. Preferably, the cantilever beam structure 2 is a double-hole parallel beam structure 10, so that the anti-unbalance loading capability is strong (the four corners of the beam surface can be conveniently corrected), and the structure is symmetrically distributed at two ends of the installation plane.

In the technical scheme, the utility model discloses a centre is fixed mounting platform 1, and both ends symmetric distribution is two cantilever beam structure 2, and the stress point is per two atress abrupt platforms 3 on every side, and symmetric distribution. When the force value is acted on the sensor through the upper bearing plate, the force value is uniformly distributed on the four stress bosses 3, and an inverse bridge type structure is formed when the sensor is stressed.

In order to reduce the stressed area of the upper surface, the utility model discloses the atress abrupt platform 3 that falls into each two facets at the stress surface at both ends of cantilever beam structure comes the atress, and four atress abrupt platforms 3 are on same plane. As shown in fig. 5, the bottom plane of the upper module plate 11 of the test mold is placed on the four force-bearing bosses 3, when the upper surface of the upper module plate 11 is stressed, the force values are evenly distributed on the four force-bearing bosses 3, and the two force-bearing bosses 3 on the left and right are stressed evenly, the force at the left 2 point is F1, the force at the right 2 point is F2, and the resultant force F is F1+ F2. The strain gauges are adhered to the upper plane and the lower plane of the cantilever beam, the left strain gauge and the right strain gauge are divided into positive strain and negative strain according to the influence of stress, two sets of strain gauges which are both in positive strain are combined in pairs and placed on the opposite sides of the Wheatstone bridge, and meanwhile, the two sets of strain gauges which are connected in pairs and in negative strain form a full bridge circuit. The strain gauges on the two cantilever beams are combined into a Wheatstone bridge by a circuit, and the electric signals generated by the simultaneous stress on the two ends are organically combined into a whole

Owing to adopted above-mentioned technical scheme, to the four corners error problem that causes because mechanical structure's error (each atress abrupt platform atress in both ends is uneven) and paster position are inaccurate, the utility model discloses can conveniently adjust through the wall thickness of the cantilever beam of revising both ends, for example, the output at four angles on the test pressurization flat board compares with middle output, and which output just revises the wall thickness that corresponds the department for a short time.

Preferably, the center of the fixed mounting platform 1 is provided with a space avoiding position 5. Preferably, the area of the fixed mounting platform 1 around the clearance 5 is provided with a plurality of mounting holes 6.

Preferably, the upper surface of the fixed mounting platform 1 is formed with a mounting portion 7 that is recessed downward.

Preferably, the upper surface of the fixed mounting platform 1 is provided with a wire outlet hole 8 and a wiring groove 9 penetrating through the upper surface, and the wire outlet hole 8 is communicated with the wiring groove 9.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. A load cell, comprising: the cantilever beam structure comprises a fixed mounting platform (1) and a cantilever beam structure (2), wherein one cantilever beam structure (2) is symmetrically arranged on two sides of the fixed mounting platform (1), two stress protruding platforms (3) are formed on the upper surface of the cantilever beam structure (2), strain gauges (4) are respectively arranged on the upper surface and the lower surface of a cantilever of the cantilever beam structure (2), and the lower surfaces of the fixed mounting platform (1) and the cantilever beam structure (2) are reference mounting surfaces.

2. The load cell according to claim 1, wherein the cantilever beam structure (2) is a dual-hole parallel beam structure.

3. Load cell according to claim 1, characterized in that the fixed mounting platform (1) is provided with a space avoidance point (5) in its centre.

4. Load cell according to claim 3, characterized in that the area of the fixed mounting platform (1) around the clearance space (5) is provided with a plurality of mounting holes (6).

5. Load cell according to claim 4, characterized in that the upper surface of the fixed mounting platform (1) is formed with a mounting portion (7) that is recessed downwards.

6. the load cell according to claim 5, wherein the fixed mounting platform (1) has an outlet hole (8) and a raceway groove (9) extending through the upper surface, and the outlet hole (8) is communicated with the raceway groove (9).