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KR-102963114-B1 - Torsion Spring Based Scale Having Precision Metrology Section

KR102963114B1KR 102963114 B1KR102963114 B1KR 102963114B1KR-102963114-B1

Abstract

The present invention relates to a scale having a torsion spring-based precision measuring section, which measures the weight of an object based on the rotational elastic modulus of a torsion spring. It may include setting a section as a precision measurement section where the variation value of the force (F) required for linear strain relative to the linear strain of the torsion spring is smaller than the variation value of the force (F) required for strain relative to the strain of the linear spring.

Inventors

  • 권오석
  • 이상호

Assignees

  • 재단법인대구경북과학기술원

Dates

Publication Date
20260511
Application Date
20230920

Claims (11)

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  4. A torsion spring comprising a coil portion having a unique rotational elastic modulus and a pressure end portion extending from the starting end and the end end of the coil portion, respectively; A first connecting member connecting one end of the torsion spring to the main body of the scale; and A second connecting member connecting the other end of the torsion spring to a measuring part on which a measurement object is placed; A scale having a torsion spring-based precision measurement section, characterized by setting a section where the variation value of the force (F) required for linear strain relative to the linear strain of the torsion spring is smaller than the variation value of the force (F) required for strain relative to the strain of the linear spring as a precision measurement section.
  5. In paragraph 4, A scale having a precision measurement section based on a torsion spring, characterized by setting a section where the elastic modulus (K) value relative to linear strain of the torsion spring is smaller than the elastic modulus (K) value relative to strain of the linear spring as a precision measurement section.
  6. In paragraph 4, Initial angle of the above torsion spring before deformation Set the value to less than 180 degrees, but the initial angle before deformation A scale having a torsion spring-based precision measuring section characterized by the fact that the measurement precision of force F above the reference strain increases as the value increases.
  7. In paragraph 4, A scale having a torsion spring-based precision measuring section, characterized by further including a placement adjustment means for arranging multiple torsion springs in parallel.
  8. In paragraph 4, A scale having a torsion spring-based precision measurement section, characterized in that the strain of the torsion spring is set by changing at least one of the following factors: the material, thickness, number of turns of the coil portion, rotational elastic modulus, and initial angle of the torsion spring.
  9. In paragraph 4, Initial angle of the above torsion spring before deformation A scale having a torsion spring-based precision measuring section characterized by the fact that the measurement precision of force F above the reference strain increases as the value increases.
  10. In Paragraph 9, Initial angle of the above torsion spring before deformation A scale having a torsion spring-based precision measuring section characterized by adjusting the value to less than 180 degrees to control the required detailed precision of the object being measured.
  11. Precisely measure the weight of an object based on the rotational elastic modulus of a torsion spring, and The minimum precision measurement weight of the above object to be measured Defined as, the desired minimum precision measured deformation amount When defined as such, the equivalent linear elastic modulus It can be defined by the relationship, and using the above relationship, the minimum precision measured weight and minimum precision measured deformation amount are substituted to derive the elastic modulus (Keq) value, and A scale having a torsion spring-based precision measurement section, characterized by designing a torsion spring by determining the rotational elastic modulus C of the torsion spring by substituting the elastic modulus (Keq) value derived from the formula, the length values of the first and second connecting members, and the initial angle value of the torsion spring determined according to the desired precision.

Description

Torsion Spring Based Scale Having Precision Metrology Section The present invention relates to a scale having a torsion spring-based precision measuring section, wherein a precision measuring section can be set according to the weight of an object to be measured, and the precision measuring section can be set to a desired value by changing the minimum value of strain and the minimum value of force to be precisely measured to a desired value, and the precision can be improved. Generally, when a pulling force is applied to a spring, its length increases, and when a pushing force is applied, its length decreases. A scale is known that utilizes the property that the degree to which the spring is stretched is proportional to the force applied to it. Figure 1 shows a cross-sectional view illustrating the structure of a conventional scale. A scale as illustrated in FIG. 1 comprises a frame (1) forming the outer shape, a tray (2) placed on the frame (1) on which an object to be weighed is placed, a lifting member (3) extending downward from the tray (2) and installed to penetrate the upper surface of the frame (1), a support plate (1) placed on the inner rear side of the frame (1) and fixed to the frame (1), an upper support link (4a) and a lower support link (4b) each having one end hinged to the upper and lower parts of the lifting member (3) and the other end hinged to the support plate (1), a spring (6) installed between an extension part (3a) extending from the lifting member (3) and a tension adjustment part (3a) installed to penetrate the upper part of the frame (1) to elastically support the lifting member (3), a measuring link (7) having one end hinged to the support plate (1), a first connecting link (5a) having one end hinged to the lifting member (3), and one end of the first connecting link (5a) and It comprises a second connecting link (5b) that is hinged and whose other end is hinged to the middle of the measuring link (7), a rack (8a) that is hinged to the other end of the measuring link (7), and a pinion gear (8b) that is axially connected to the rack (8a) and has a scale needle (9) positioned to be exposed on the front of the frame (1). In operation, when an object is placed on the tray (2), the lifting member (3) lowers, and accordingly, the first and second connecting links (5a, 5b) and the measuring link (7) lower in conjunction with the lifting member (3). Then, as the rack (8a) connected to the other end of the measuring link (7) lowers, it rotates the pinion gear (8b), and accordingly, the scale needle (9) rotates to indicate the weight of the object placed on the tray (2). However, the aforementioned conventional scale had a problem in that it had limitations in precisely measuring the weight of an object. FIG. 1 is a cross-sectional view showing the structure of a conventional scale. FIG. 2 is a conceptual diagram explaining the measurement principle of a scale using a conventional linear spring. FIG. 3 is a conceptual diagram illustrating the measurement principle of a scale having a torsion spring-based precision measurement section according to the present invention. FIG. 4 is an example diagram of a precision measurement section setting of a scale having a torsion spring-based precision measurement section according to the present invention. FIG. 5 is a graph showing the correlation of the force value required according to the increase in linear strain of a torsion spring forming a precision measurement section starting from a strain of 10% of the present invention. FIG. 6 is a graph showing the correlation between the elastic modulus value and the increase in linear strain of a torsion spring forming a precision measurement section starting from a strain of 10% according to the present invention. FIG. 7 is a graph showing the correlation of the force value required according to the increase in linear strain of a torsion spring forming a precision measurement section starting from a strain of 20% of the present invention. FIG. 8 is a graph showing the correlation of elastic modulus values according to the increase in linear strain of a torsion spring forming a precision measurement section starting from a strain of 20% of the present invention. The present invention according to a preferred embodiment will be described in detail below with reference to the attached drawings. Here, the same reference numerals are used for identical components, and repetitive descriptions and detailed descriptions of known functions and components that may unnecessarily obscure the essence of the invention are omitted. The embodiments of the invention are provided to more completely explain the invention to those with average knowledge in the art. Accordingly, the shapes and sizes of elements in the drawings may be exaggerated for clearer explanation. FIG. 3 is a conceptual diagram explaining the measurement principle of a scale having a precision measurement section based on a torsion spring according t