Capacitance-grating type digital display measuring tape
A capacitance grid and tape measure technology is applied in the field of measuring instruments, which can solve the problems affecting the measurement accuracy, the difficulty in processing the tape, and the measurement accuracy of the capacitance grid type digital display tape measure, so as to improve the measurement range, improve reliability and long-term stability. sexual effect
Inactive Publication Date: 2018-03-27
GUILIN GEMRED SENSOR TECH
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Problems solved by technology
In this embodiment, it is not considered that the circumference of each circle of the ruler tape is inconsistent (the outer circle is large and the inner circle is small). The larger the measurement range of the product, the more the number of winding circles, the greater the deviation value, directly It affects the measurement accuracy of the capacitive digital tape measure
This coaxial structure cannot guarantee the consistency of tape winding, and its winding tightness affects the repeatability and reliability of measurement results.
In its embodiment 2, the capacitive grid sensor is mounted on the toothed rotating wheel, and equidistant round holes are opened on the scale tape to cooperate with the gear rotation. The processing of the scale tape with this structure is relatively difficult, and the processing of the round holes on the scale tape Accuracy directly affects measurement accuracy
And this structure is not suitable for various ruler tapes (such as wire tape)
Method used
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[0029] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.
[0030] Such as Figure 1-3 As shown, a capacitive digital display tape measure includes a housing, a tape box 1, a tape 2, a capacitive sensor and a single-chip microcomputer. The housing includes a front cover 14, a support 15 and a rear cover 16; and connect the two. A rotatable central shaft 3 is provided along its axial direction in the housing, and the ruler tape box 1 is coaxially fixed on the central shaft 3 and corresponds to the position on the rear side of the housing. The tape box 1 is provided with a clockwork spring 4 which is pre-tensioned; the tape 2 is wound and collected in the groove on the outer circumference of the tape box 1, and one end of it passes through the outlet on the side wall of the ...
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The invention relates to a capacitance-grating type digital display measuring tape, which comprises a shell body, a tape belt box, a tape belt and a capacitance-grating sensor, wherein a rotatable middle shaft is arranged in the shell body along the axial direction thereof, the tape belt box is mounted on one side, close to the rear surface of the shell body, inside the shell body by means of themiddle shaft, and a spring is arranged in the tape belt box for pre-tightening the tape belt box; the tape belt is wound and collected in a groove on the outer circumference of the tape belt box; thecapacitance-grating sensor is positioned on one side, close to the front surface of the shell body, inside the shell body and obtains a measured length of the tape belt through measuring a rotating angle of the middle shaft; and the inner wall of the shell body is provided with a self-adjusting mechanism at a position corresponding to an outlet, and the self-adjusting mechanism is used for adjusting a speed at which the tape belt extends out of the shell body or retracts into the shell body. According to the capacitance-grating type digital display measuring tape, the self-adjusting mechanismautomatically adjusts the speed at which the tape belt extends out of the shell body or retracts into the shell body, so as to prevent a measurement result from being affected because a response speedof the capacitance-grating sensor is unable to keep pace with the excessively fast speed at which the tape belt extends out of the shell body or retracts into the shell body.
Description
technical field [0001] The invention relates to the field of measuring instruments, in particular to a capacitive digital display tape measure. Background technique [0002] With the development of modern electronic technology, the length measurement is gradually realized digital and intelligent. Hall sensors, photoelectric sensors, and capacitive sensors are all widely used in the field of digital display tapes, and capacitive sensors are more worthy of promotion due to their low power consumption. [0003] The Chinese utility model patent No. 201220739071.X discloses a digital display tape measure, which is provided with a laser irradiator and consumes a lot of power. The accuracy of this patented product depends on the distance between two points of the through-holes that are evenly distributed on the tape and perpendicular to the length direction of the tape. If the hole spacing is 5mm, the measurement accuracy is 10mm. Too dense small holes will increase the difficult...
Claims
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Login to View More IPC IPC(8): G01B3/10
CPCG01B3/10G01B3/1003G01B3/1061G01B3/1069
Inventor李广金陈叶吴岳杨广禄文夏梅卢辉李文爱
OwnerGUILIN GEMRED SENSOR TECH