CN101813536A - Two-component large-load force sensor - Google Patents

Abstract

The invention relates to a two-component large-load force sensor, which belongs to the field of force sensors. Dig out two rectangular openings on the front of the above-mentioned sensor main body, one of which is arranged vertically and is located on the left side of the sensor main body, and the other rectangular opening is arranged horizontally and is located on the right side of the sensor main body, forming an overall inverted "sun" shaped structure; the distance between the above-mentioned longitudinally arranged rectangular mouths and the top surface is less than the distance from the left side; the distance between the above-mentioned horizontally arranged rectangular mouths and the top surface is greater than the distance from the side surfaces. The two-component large-load sensor with this structure has the advantages of small size, simple structure, large measuring range, strong decoupling, high natural frequency, and can realize high stiffness and high sensitivity of the sensor at the same time.

Description

A two-component large load force sensor

technical field

The invention belongs to the technical field of force sensors, in particular to a two-component large-load force sensor with high rigidity and high sensitivity.

Background technique

In bridge construction, ships, steel, oil fields and other industries, large-scale or ultra-large-scale force measurement is often encountered in order to implement online control of the results of concern. Especially driven by the demand for heavy-duty operating equipment, the continuous development of large-load sensors is promoted. Due to the high technical difficulty of large load sensors, currently the internationally mature technologies mainly include single-component large load sensors provided by Kelk Company of Canada and ABB Company of Sweden. Domestic products mainly rely on imported products, and most of the heavy-duty equipment is still not available. Implement overloaded measurements. In China, the large load sensors mainly include single-component large-load sensors and six-component large-load sensors. The single-component large-load sensors mainly include an attached load cell disclosed in CN86105879A invention patent to realize indirect measurement of single-component large loads, utility model patents The nine-column force measuring sensor disclosed in CN201417189, the large force value weighing force sensor disclosed in the utility model patent CN201285314Y and the strain type steel rolling force test sensor disclosed in the utility model patent CN201126387Y; the six-component large load sensor is mainly disclosed in the invention patent CN101149299A The three-dimensional force integrally assembled six-dimensional force measuring sensor, the piezoelectric six-dimensional force sensor disclosed in CN101149300A, a six-dimensional parallel sensor with a large strain deformation ratio disclosed in CN200710023654.6, and the super-large strain combination sensor disclosed in utility model patent CN2108913U load cell. The load sensors mentioned above all adopt an assembly structure, which is relatively complicated in terms of structural design and manufacture, and the structure is not compact, so it is difficult to realize miniaturization, and currently 2 to 5 components of large load sensors are rare.

The sensitive unit of the above strain sensor participates in the load transmission. In order to improve the signal-to-noise ratio as much as possible, the sensitive unit has to be made more sensitive, but at the same time it brings problems of low stiffness and load. In addition, the existing parallel sensors technically have complex structures, low stiffness, low sensitivity, difficult calibration, high manufacturing costs, and generally low stiffness of sensitive components, which makes it difficult to coordinate the contradiction between stiffness and sensitivity.

Contents of the invention

The object of the present invention is to provide a two-component large load sensor with high stiffness, high frequency response and high sensitivity, which effectively solves the contradiction between the stiffness and sensitivity of the existing strain sensor, and can be widely used in dynamic applications of two-component large loads. dynamometer.

A two-component large load sensor is characterized in that: the main body of the sensor is a cuboid structure; two rectangular openings are dug out on the front of the above-mentioned sensor main body, and one of the rectangular openings is arranged longitudinally and is located on the left side of the sensor main body. The other rectangular opening is arranged horizontally and is located on the right side of the sensor body, forming an overall inverted "sun"-shaped structure; the distance from the above-mentioned longitudinally arranged rectangular opening to the top surface is smaller than the distance from the left side; the above-mentioned horizontally arranged rectangular opening The distance between the mouth and the top surface is greater than the distance from the right side; the middle part of the two rectangular mouths in the above sensor structure is called the main support beam, the lower part of the two rectangular mouths is called the base, and the left side of the longitudinally arranged rectangular mouth The part is called the first auxiliary support beam, the upper part is called the first strain beam, the upper part of the horizontally arranged rectangular opening is called the second auxiliary support beam, and the right part is called the second strain beam, in which the first strain beam They are respectively perpendicular to the first auxiliary support beam and the main support beam, and the second strain beam is respectively perpendicular to the second auxiliary support beam and the base; the first strain beam and the second strain beam of the sensor are attached with strain gauges respectively to form two sets of measuring bridges.

The above sensor has a rectangular parallelepiped structure, and the two sensitive units are respectively composed of a carrying unit and a sensing unit. The two-component large-load sensor has the advantages of simple structure, strong decoupling, low cost, large load, high rigidity, high natural frequency, high sensitivity, and high precision. It can be widely used in the measurement of heavy-duty dynamic force of heavy-duty operating equipment.

Description of drawings

Fig. 1 is a structural schematic diagram of a two-component large load sensor;

Label names in the figure: 1, the first strain beam, 2, the second strain beam, 3, the base, 4, the second auxiliary support beam, 5, the first auxiliary support beam, 6, the main support beam, 7-14, Strain gauges.

Detailed ways

With reference to Fig. 1, the present invention provides a kind of two-component large load sensor by the first strain beam 1, the second strain beam 2, the base 3, the second auxiliary support beam 4, the first auxiliary support beam 5, the main support beam 6 , Strain gauges 7-14. Among them, the sensitive units in the two directions are composed of the main support beam and the strain beam in parallel. The main support beam has high stiffness to bear most of the load of the connecting rod branch, and is the load-bearing unit; the strain beam has low stiffness and high sensitivity, and is used for The output of the patch and measurement signal is the sensing unit.

The working principle of the present invention is: when the upper part of the main support beam bears a large load ±Y, the main support beam bears most of the load, and the first strain beam 1 only bears a small part of the load. When the main supporting beam bears the Y-direction force, the strain gauges 7 and 8 of the first strain beam 1 produce tensile stress +ε, and the strain gauges 9 and 10 produce compressive stress -ε, and the strain gauges 7 and 8 and the strain gauges 9 and 10 respectively The Y-direction force can be measured by connecting pairs of arms to form an electric bridge; when the main support beam bears the -Y-direction force, the strain gauges 7 and 8 of the first strain beam 1 generate compressive stress -ε, and the strain gauges 9 and 10 generate tensile stress Stress + ε, strain gauges 7, 8 and strain gauges 9, 10 are respectively connected into pairs of arms to form an electric bridge to realize -Y direction force measurement. When the force in the ±Y direction acts, the second strain beam 2 is under tension or compression, and the polarities of the strain gauges 11, 12, 13, 14 on it are consistent, and there is no output signal.

Similarly, when the main support beam bears a large load ±X, the main support beam bears most of the load, and the second strain beam 2 only bears a small part of the load. When the main support beam bears the X-direction force, the strain gauges 13 and 14 of the second strain beam 2 produce tensile stress +ε, and the strain gauges 11 and 12 produce compressive stress -ε, and the strain gauges 11 and 12 and the strain gauges 13 and 14 respectively Connecting pairs of arms to form an electric bridge can realize X-direction force measurement; when the main support beam bears -X-direction force, the strain gauges 11 and 12 of the second strain beam 2 generate compressive stress +ε, and the strain gauges 13 and 14 generate tensile stress Stress-ε, strain gauges 11, 12 and strain gauges 13, 14 are respectively connected into pairs of arms to form an electric bridge to realize -X direction force measurement. When the ±X-direction force acts, the first strain beam 1 is under tension or compression, and the polarities of the strain gauges 7, 8, 9, and 10 on it are consistent, and there is no output signal.

Claims (1)

1. A two-component large load sensor, characterized in that: The main body of the sensor is a cuboid structure; Dig out two rectangular openings on the front of the above-mentioned sensor main body, one of which is arranged vertically and is located on the left side of the sensor main body, and the other rectangular opening is arranged horizontally and is located on the right side of the sensor main body, forming an overall inverted "sun" Shaped structure; the distance from the top surface of the above-mentioned longitudinally arranged rectangular mouth is less than the distance from the left side; the distance from the above-mentioned horizontally arranged rectangular mouth from the top surface is greater than the distance from the right side; In the above sensor structure, the part between the two rectangular openings is called the main support beam (6), the part below the two rectangular openings is called the base (3), and the left part of the longitudinally arranged rectangular openings is called the first auxiliary support. The beam (5), the upper part is called the first strain beam (1), the upper part of the horizontally arranged rectangular opening is called the second auxiliary support beam (4), and the right part is called the second strain beam (2), Wherein the first strain beam (1) is perpendicular to the first auxiliary support beam (5) and the main support beam (6) respectively, and the second strain beam (2) is respectively perpendicular to the second auxiliary support beam (4) and the base (3) vertical; The first strain beam (1) and the second strain beam (2) of the above-mentioned sensor are respectively pasted with strain gauges to form two sets of measuring electric bridges.