CN114353660A - Circle area measuring device and method - Google Patents
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Abstract
The invention relates to a circle area measuring device, comprising: a capacitive sensor and a display module. The capacitance grid type sensor comprises a fixed grid and a movable grid, and relative displacement along the length direction of the fixed grid can be generated between the fixed grid and the movable grid; the display component comprises a display screen and a circuit board, the capacitive grating sensor and the display screen are both electrically connected to the circuit board, the capacitive grating sensor transmits and calculates a measurement signal generated according to the relative displacement through the circuit board and then transmits the measurement signal to the display screen, and the display screen shows the area of a circle to be measured. According to the circle area measuring device, after the relative displacement between the fixed grid and the movable grid in the capacitive grid sensor is transmitted and calculated through the circuit board, the area of the circle to be measured is displayed on the display screen, the step of acquiring the area of the circle in the prior art is simplified, and the measuring result of the area of the circle is more accurate. When being applied to during the electric wire and cable detects, can learn the specification and the parameter of cable conductor more fast, promote the efficiency of engineering operation process.
Description
Technical Field
The invention relates to the technical field of measurement, in particular to a circular area measuring device and method.
Background
With the fact that projects such as infrastructure and power grid laying occupy more important low positions in national development, engineering technicians pursue efficiency and quality in the construction process due to the development of national high-speed economic science and technology, and actual requirements in the construction process are paid attention gradually. During construction, it is generally necessary to measure a tubular consumable or a part such as an electric wire having a cylindrical cross section in order to sufficiently display the specification of the part. In practical applications, such as during the use of wires or cables, engineers are more familiar with the cross-sectional area of wires or cables to indicate the size and gauge of the wires or cables.
At present, the commonly used method for measuring the cylindrical section is to measure the diameter or radius of the cylinder by a caliper, and calculate the sectional area of the cylindrical section by a calculator after reading out data, so that the construction efficiency is affected by the need of replacing equipment for calculation in the practical application process. Further, for convenience of use, a standard ruler is generally used to measure the cross-sectional area of the cylinder in the conventional method. The standard ruler is provided with a plurality of standard holes with different apertures, and the main measuring method is that a cylinder passes through the holes on the standard ruler, and the cross section of the cylinder is obtained by matching the holes which are consistent with the cross section of the cylinder. Because the number of standard holes on the standard ruler is limited, if the standard ruler does not have the hole diameter matched with the cross section of the cylinder, the situation that measurement cannot be carried out exists. And the standard hole is abraded after being used for many times, so that the accuracy of the measuring result of the cylindrical sectional area is influenced.
Disclosure of Invention
Therefore, it is necessary to provide a circular area measuring device and method for solving the problems of the conventional cylindrical cross-sectional area that the measurement process is not convenient and accurate.
A circular area measuring device comprising:
the capacitive grating sensor comprises a fixed grating and a movable grating, and relative displacement along the length direction of the fixed grating can be generated between the fixed grating and the movable grating;
the display assembly, the display assembly includes display screen and circuit board, the capacitance grid type sensor with the equal electric connection of display screen in the circuit board, the capacitance grid type sensor basis according to the measuring signal warp that relative displacement produced the circuit board transmission and calculate the back transmit in the display screen, the display screen shows the area of the circle that awaits measuring.
According to the circle area measuring device, the capacitance grid type sensor is used, the relative displacement between the fixed grid and the movable grid in the capacitance grid type sensor along the length direction of the fixed grid is transmitted through the circuit board and calculated, the area of the circle to be measured is displayed on the display screen, the step of obtaining the area of the circle in the prior art is simplified, and the measuring result of the area of the circle is more accurate. When being applied to during the electric wire and cable detects, can learn the specification and the parameter of cable conductor more fast, promote the efficiency of engineering operation process.
In one embodiment, the circuit board includes a conversion circuit and an amplification circuit chip, the capacitance-gate sensor converts the relative displacement into a capacitance value signal, the conversion circuit converts the capacitance value signal into a pulse signal, the pulse signal is converted into a displacement quantity value by the amplification circuit chip, the displacement quantity value is obtained by a circle area calculation formula in the amplification circuit chip, and then the area of the circle to be detected is sent to the display screen, and the display screen shows the area of the circle to be detected.
In one embodiment, the circle area measuring device further includes:
the fixed grid is fixedly connected to the fixed scale along the length direction of the fixed scale, scale marks are arranged on the fixed grid, and the numerical values of the scale marks are sequentially increased from zero value to the other end of the fixed scale;
the movable scale, the movable scale can be followed the length direction of scale removes, display element set up in the movable scale is kept away from one side of scale, movable grid fixed connection in the movable scale is close to one side of scale, the movable scale is close to the edge of zero value with during the zero value parallel and level, relative displacement is zero, the registration of display screen is 0.
In one embodiment, the fixed ruler is provided with a first clamping jaw, the first clamping jaw is arranged on one side of the fixed ruler, the first clamping jaw is provided with a first reference surface, and the first reference surface is arranged on one side, away from the movable ruler, of the first clamping jaw;
the movable ruler is provided with a second clamping jaw, the second clamping jaw is arranged on one side, close to the first clamping jaw, of the movable ruler, the second clamping jaw is provided with a second reference surface, and the second reference surface is arranged on one side, far away from the first clamping jaw, of the second clamping jaw;
the distance between the first reference surface and the second reference surface is equal to the relative displacement, and the first clamping jaw and the second clamping jaw are arranged in an axisymmetric mode.
In one embodiment, the fixed ruler is further provided with a third clamping jaw, the third clamping jaw is arranged on the opposite side of the first clamping jaw, the third clamping jaw is provided with a third reference surface, and the third reference surface is arranged on one side, close to the movable ruler, of the third clamping jaw;
the movable ruler is further provided with a fourth clamping jaw, the fourth clamping jaw is arranged on the opposite side of the second clamping jaw, the fourth clamping jaw is provided with a fourth reference surface, and the fourth reference surface is arranged on one side, close to the third clamping jaw, of the fourth clamping jaw;
the distance between the third reference surface and the fourth reference surface is equal to the relative displacement, and the fourth clamping jaw and the third clamping jaw are arranged in an axial symmetry mode.
In one embodiment, the movable ruler further comprises a key, the key is arranged around the display component, and the key is electrically connected to the display component.
In one embodiment, the circular area measuring device further comprises a fixing member, the fixing member extends into the movable ruler, and when the fixing member abuts against the fixed ruler, the movable ruler is stationary relative to the fixed ruler.
In one embodiment, the circular area measuring device further comprises an adjusting wheel, the adjusting wheel is connected to the movable ruler, and when the adjusting wheel is pressed on the fixed ruler and rolls relative to the fixed ruler, the movable ruler moves along the length direction of the fixed ruler.
In one embodiment, the movable ruler is provided with a non-slip part.
A circle area measuring method is based on the circle area measuring device and comprises the following steps:
the movable ruler is pushed to move along the length direction of the fixed ruler, the movable ruler is fixedly connected with a movable grid, and the fixed ruler is fixedly connected with a fixed grid, so that the movable grid generates relative displacement relative to the fixed grid;
the capacitance grid type sensor converts the relative displacement into a capacitance value signal and transmits the capacitance value signal to the conversion circuit;
the conversion circuit converts the capacitance value signal into a pulse signal and transmits the pulse signal to the amplification circuit chip;
the amplifying circuit chip converts the pulse signal into a displacement magnitude value, obtains the area size of the circle to be detected through a circle area calculation formula and then sends the area size to the display screen;
the display screen shows the measurement data of the area of the circle to be measured.
According to the circle area measuring method, the circle area measuring device is used, the capacitance grid type sensor is used, relative displacement between the fixed grid and the movable grid in the capacitance grid type sensor along the length direction of the fixed grid is transmitted through the circuit board and calculated, then the area of the circle to be measured is displayed on the display screen, the step of obtaining the area of the circle in the prior art is simplified, and the measuring result of the area of the circle is more accurate. When being applied to during the electric wire and cable detects, can learn the specification and the parameter of cable conductor more fast, promote the efficiency of engineering operation process.
Drawings
FIG. 1 is a schematic structural diagram of a capacitive sensor according to an embodiment;
FIG. 2 is a schematic diagram showing the periodic variation of capacitance when the movable grid moves relative to the fixed grid;
fig. 3 is a schematic structural diagram of a circular area measuring device according to an embodiment.
In the figure:
100. a circular area measuring device; 10. a capacitive-gate sensor; 11. fixing a grid; 12. moving the grid; 20. sizing; 21. a first jaw; 22. a second jaw; 23. a third jaw; 24. a fourth jaw; 30. moving the ruler; 31. a display component; 32. a fixing member; 33. an adjustment wheel; 34. pressing a key; 35. and an anti-slip part.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
A circular area measuring apparatus 100 according to an embodiment includes: a capacitive sensor 10 and a display module 31. The capacitive sensor 10 is a variable area type capacitive sensor. Fig. 1 shows a relative position diagram of the fixed grating 11 and the movable grating 12 in the capacitive sensor 10 according to an embodiment at a moment in fig. 1. Because the capacitive sensor 10 has the average effect caused by the multi-pole capacitance, and has the characteristics of strong anti-interference performance, high measurement precision and large measurement range while having the capacitive sensor, the circular area measurement device 100 in the embodiment greatly improves the precision and the accuracy of the circular area measurement result by using the capacitive sensor 10.
Further, the pitch of the fixed grid 11 is 8 times the pitch of the moving grid 12. That is, every 8 moving grids 12 correspond to one moving grid 12, and within the pitch of one fixed grid 11, half of the moving grids 12 are shielding plates, that is, 4 moving grids 12 are coupled with the fixed grid 11. Preferably, the pitch of the fixed grid 11 is 5.08mm, and the pitch of the movable grid 12 is 0.635 mm.
Referring to fig. 3, the display module 31 includes a display screen and a circuit board, the capacitive grating sensor 10 and the display screen are both electrically connected to the circuit board, the measurement signal generated by the capacitive grating sensor 10 according to the relative displacement is transmitted to the display screen after being transmitted and calculated by the circuit board, and the display screen shows the area of the circle to be measured. Further, the diameter of the circle to be measured can also be simultaneously shown on the display screen, so that the circle area measuring device 100 in this embodiment can measure the diameter of the circle to be measured while measuring the area of the circle to be measured, and is also suitable for parts requiring the diameter numerical value to represent the specification. Preferably, the indication of the area of the circle to be measured is in square millimeters and the indication of the diameter of the circle to be measured is in millimeters.
Further, the circuit board includes converting circuit and amplifier circuit chip, and capacitive grating sensor 10 converts the relative displacement into the capacitance value signal, and converting circuit converts the capacitance value signal into pulse signal, and the pulse signal is converted into the displacement quantity value through amplifier circuit chip again, and the displacement quantity value is sent to the display screen after the area size of the circle that awaits measuring is obtained through the circle area calculation formula inside amplifier circuit chip, and the display screen shows the area of the circle that awaits measuring.
Specifically, the moving grid 12 forms a differential capacitor with different small electrodes during the moving process, and the capacitance changes periodically when the moving ruler 30 moves relative to the fixed ruler 20, as shown in fig. 2. According to the calculation formula of the interplanar capacitors
Where e is the dielectric constant and d is the distance between the two plates, the maximum capacitance of the corresponding multi-plate capacitive-gate sensor 10 is related to the number of gates. The conversion circuit converts the signal into a pulse signal, the pulse signal is processed by the amplification circuit chip to obtain displacement change, and the diameter d is obtained by testing the displacement change. After the diameter of the circle to be measured is obtained by the amplifying circuit chip, the calculation formula is used
And calculating the area of the circle to be measured through the internal part of the amplifying circuit chip. And the area of the circle to be measured is obtained by the internal calculation of the amplifying circuit chip, and the display screen shows the number.
According to the circle area measuring device 100, the capacitance grid type sensor 10 is used, after the relative displacement between the fixed grid 11 and the movable grid 12 in the capacitance grid type sensor 10 along the length direction of the fixed grid 11 is transmitted through the circuit board and calculated, the area of the circle to be measured is displayed on the display screen, the step of obtaining the area of the circle in the prior art is simplified, and the measuring result of the area of the circle is more accurate. When being applied to during the electric wire and cable detects, can learn the specification and the parameter of cable conductor more fast, promote the efficiency of engineering operation process.
Referring to fig. 3, in an embodiment, the circular area measuring device 100 further includes a fixed ruler 20 and a movable ruler 30.
The fixed grid 11 is fixedly connected to the fixed scale 20 along the length direction of the fixed scale 20, the fixed grid 11 is provided with scale marks, and the numerical values of the scale marks are sequentially increased from zero value to the other end of the fixed scale 20. The movable ruler 30 can move along the length direction of the fixed ruler 20, the display component 31 is arranged on one side, far away from the fixed ruler 20, of the movable ruler 30, the movable grid 12 is fixedly connected to one side, close to the fixed ruler 20, of the movable ruler 30, when the edge, close to a zero value, of the movable ruler 30 is flush with the zero value, relative displacement is zero, and the display screen is 0.
In one embodiment, the fixed scale 20 is provided with a first jaw 21, the first jaw 21 is arranged on one side of the fixed scale 20, the first jaw 21 is provided with a first reference surface, and the first reference surface is arranged on one side of the first jaw 21 far away from the movable scale 30. The movable ruler 30 is provided with a second jaw 22, the second jaw 22 is arranged on one side, close to the first jaw 21, of the movable ruler 30, the second jaw 22 is provided with a second reference surface, and the second reference surface is arranged on one side, far away from the first jaw 21, of the second jaw 22. The distance between the first reference surface and the second reference surface is equal to the relative displacement. The first jaw 21 and the second jaw 22 are arranged in axial symmetry. When the circle to be measured is the cross section of a hole, the first clamping jaw 21 and the second clamping jaw 22 extend into the hole to be measured, and the distance between the first reference surface and the second reference surface is the diameter of the hole. Further, the length directions of the first jaw 21 and the second jaw 22 are perpendicular to the length direction of the fixed length 20. The sectional areas of the first jaw 21 and the second jaw 22 are gradually reduced from one side close to the fixed length 20 to one side far away from the fixed length 20, and the device is suitable for the condition that the circle to be measured is located in a small aperture.
In one embodiment, the fixed scale 20 is further provided with a third jaw 23, the third jaw 23 is arranged at the opposite side of the first jaw 21, the third jaw 23 is provided with a third reference surface, and the third reference surface is arranged at the side of the third jaw 23 close to the movable scale 30. The movable rule 30 is further provided with a fourth jaw 24, the fourth jaw 24 is arranged on the opposite side of the second jaw 22, the fourth jaw 24 is provided with a fourth reference surface, and the fourth reference surface is arranged on one side, close to the third jaw 23, of the fourth jaw 24. The distance between the third reference surface and the fourth reference surface is equal to the relative displacement. The fourth jaw 24 and the third jaw 23 are arranged in axial symmetry. Further, the length directions of the third jaw 23 and the fourth jaw 24 are perpendicular to the length direction of the fixed length 20. When the circle to be measured is a cylindrical section, the third jaw 23 and the fourth jaw 24 clamp the cylinder to measure, and the distance between the third reference surface and the fourth reference surface is the diameter of the cylindrical section. The sectional areas of the third jaw 23 and the fourth jaw 24 are gradually reduced from the side close to the fixed length 20 to the side far away from the fixed length 20, so that more precise measurement is facilitated.
In one embodiment, the movable ruler 30 further includes a key 34, the key 34 is disposed around the display component 31, and the key 34 is electrically connected to the display component 31. Specifically, the number of the keys 34 is four, and the four keys 34 are all electrically connected to the circuit board, which are respectively a first key, a second key, a third key and a fourth key. The first key is an open key for controlling whether the display screen of the circular area measuring device 100 in this embodiment displays, and when there is no number on the display screen, the display screen can be waken up by pressing the first key, so that the number can be read. The second key is a zero setting key, when the area of a known circle is required to be used as a reference, the relative displacement between the fixed grid 11 and the movable grid 12 at the moment is used as the reference, the area of the circle displayed on the display screen is 0, the difference of the areas can be shown on the display screen by moving the fixed grid 11 and the movable grid 12 to align with the circle to be measured, and the method can be used for measuring the sectional area of a part with an annular section in practical application. The third key is a closing key, when the display screen is in a power-on state, the display screen can be powered off by pressing the closing key, and the displayed number disappears. The fourth key is a memory key, when the measured number needs to be recorded, the number can be temporarily stored by pressing the memory key, and the number can be reproduced on the display screen by long pressing. In other embodiments, the function of the key may be adjusted according to actual measurement requirements.
In one embodiment, the circular area measuring device 100 further includes a fixing member 32, the fixing member 32 extends into the movable ruler 30, and when the fixing member 32 abuts against the fixed ruler 20, the movable ruler 30 is stationary relative to the fixed ruler 20. Further, the fixing member 32 is a fastening screw, a threaded hole is formed in one side of the movable scale 30, the fastening screw is in threaded fit with the threaded hole, and when the fastening screw is screwed into the threaded hole, one side of the fastening screw abuts against the fixed scale 20, so that the fixed scale 20 is relatively fixed. Furthermore, the other side of the fastening screw is provided with a head, and the outer side of the head is provided with an anti-skid bulge, so that the head can be conveniently held and rotated by a worker. In other embodiments, the fixing member 32 may be a fixing pin, a conductive magnet, or the like, which can make the movable scale 30 stationary with respect to the fixed scale 20.
In one embodiment, the circular area measuring device 100 further includes an adjusting wheel 33, the adjusting wheel 33 is connected to the movable ruler 30, and the movable ruler 30 moves along the length direction of the fixed ruler 20 when the adjusting wheel 33 is pressed against the fixed ruler 20 and the adjusting wheel 33 rolls relative to the fixed ruler 20. Further, regulating wheel 33 is the fine setting wheel, the fine setting wheel mainly comprises bull wheel and steamboat, the bull wheel diameter is greater than the steamboat, bull wheel and steamboat coaxial drive, the steamboat hugs closely in one side of scale 20, when needs carry out the fine setting operation, it makes the steamboat roll along one side of scale 20 to rotate the bull wheel, because the bull wheel has the same angular velocity with the steamboat, the distance of bull wheel external diameter walking is greater than the distance of steamboat external diameter walking, thereby realize the fine setting, make the measuring result of the area of the circle of awaiting measuring more accurate.
In one embodiment, the movable rule 30 is provided with a non-slip portion 35. Specifically, the anti-slip portion 35 is disposed on a side of the movable scale 30 away from the fixed scale 20, so as to facilitate the movable scale 30 to move relative to the fixed scale 20 without slipping.
An embodiment of the present application provides a circle area measuring method, based on the circle area measuring apparatus 100 of any of the foregoing embodiments, including the following steps:
the movable ruler 30 is pushed to move along the length direction of the fixed ruler 20, the movable ruler 30 is fixedly connected with a movable grid 12, and the fixed ruler 20 is fixedly connected with a fixed grid 11, so that the movable grid 12 generates relative displacement relative to the fixed grid 11; the capacitance-grid sensor 10 converts the relative displacement into a capacitance signal and transmits the capacitance signal to the conversion circuit; the conversion circuit converts the capacitance value signal into a pulse signal and transmits the pulse signal to the amplification circuit chip; the amplifying circuit chip converts the pulse signal into a displacement magnitude value, obtains the area size of the circle to be detected through a circle area calculation formula and then sends the area size to the display screen; the display screen shows the measurement data of the area of the circle to be measured.
In the circular area measuring method, the circular area measuring device 100 is used, and after the relative displacement between the fixed grid 11 and the movable grid 12 in the capacitive grid sensor 10 along the length direction of the fixed grid 11 is transmitted and calculated through the circuit board by using the capacitive grid sensor 10, the area of the circle to be measured is displayed on the display screen, so that the step of acquiring the area of the circle in the prior art is simplified, and the measurement result of the area of the circle is more accurate. When being applied to during the electric wire and cable detects, can learn the specification and the parameter of cable conductor more fast, promote the efficiency of engineering operation process.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A circular area measuring device, comprising:
the capacitive grating sensor comprises a fixed grating and a movable grating, and relative displacement along the length direction of the fixed grating can be generated between the fixed grating and the movable grating;
the display assembly, the display assembly includes display screen and circuit board, the capacitance grid type sensor with the equal electric connection of display screen in the circuit board, the capacitance grid type sensor basis according to the measuring signal warp that relative displacement produced the circuit board transmission and calculate the back transmit in the display screen, the display screen shows the area of the circle that awaits measuring.
2. The circle area measuring device according to claim 1, wherein the circuit board includes a conversion circuit and an amplification circuit chip, the capacitive grating sensor converts the relative displacement into a capacitance value signal, the conversion circuit converts the capacitance value signal into a pulse signal, the pulse signal is converted into a displacement value through the amplification circuit chip, the displacement value is converted into the area of the circle to be measured and then is sent to the display screen, and the display screen shows the area of the circle to be measured.
3. The circular area measuring device according to any one of claims 1 to 2, further comprising:
the fixed grid is fixedly connected to the fixed scale along the length direction of the fixed scale, scale marks are arranged on the fixed grid, and the numerical values of the scale marks are sequentially increased from zero value to the other end of the fixed scale;
the movable scale, the movable scale can be followed the length direction of scale removes, display element set up in the movable scale is kept away from one side of scale, movable grid fixed connection in the movable scale is close to one side of scale, the movable scale is close to the edge of zero value with during the zero value parallel and level, relative displacement is zero, the registration of display screen is 0.
4. The circular area measuring device according to claim 3, wherein the fixed scale is provided with a first jaw, the first jaw is arranged on one side of the fixed scale, the first jaw is provided with a first reference surface, and the first reference surface is arranged on one side of the first jaw away from the movable scale;
the movable ruler is provided with a second clamping jaw, the second clamping jaw is arranged on one side, close to the first clamping jaw, of the movable ruler, the second clamping jaw is provided with a second reference surface, and the second reference surface is arranged on one side, far away from the first clamping jaw, of the second clamping jaw;
the distance between the first reference surface and the second reference surface is equal to the relative displacement, and the first clamping jaw and the second clamping jaw are arranged in an axisymmetric mode.
5. The circular area measuring device according to claim 3, wherein the fixed length further comprises a third jaw, the third jaw is arranged at the opposite side of the first jaw, the third jaw is provided with a third reference surface, and the third reference surface is arranged at the side of the third jaw close to the movable scale;
the movable ruler is further provided with a fourth clamping jaw, the fourth clamping jaw is arranged on the opposite side of the second clamping jaw, the fourth clamping jaw is provided with a fourth reference surface, and the fourth reference surface is arranged on one side, close to the third clamping jaw, of the fourth clamping jaw;
the distance between the third reference surface and the fourth reference surface is equal to the relative displacement, and the fourth clamping jaw and the third clamping jaw are arranged in an axial symmetry mode.
6. The circle area measuring device according to claim 3, wherein the movable ruler further comprises a key, the key is disposed around the display assembly, and the key is electrically connected to the display assembly.
7. The circular area measuring device according to claim 3, further comprising a fixing member extending into the movable scale, wherein the movable scale is stationary relative to the fixed scale when the fixing member abuts against the fixed scale.
8. The circular area measuring device according to claim 3, further comprising an adjusting wheel connected to the movable scale, wherein the movable scale moves along a length direction of the fixed scale when the adjusting wheel is pressed against the fixed scale and rolls relative to the fixed scale.
9. The circular area measuring device according to claim 3, wherein the movable rule is provided with a non-slip portion.
10. A circular area measuring method based on the circular area measuring apparatus according to any one of claims 1 to 9, comprising the steps of:
the movable ruler is pushed to move along the length direction of the fixed ruler, the movable ruler is fixedly connected with a movable grid, and the fixed ruler is fixedly connected with a fixed grid, so that the movable grid generates relative displacement relative to the fixed grid;
the capacitance grid type sensor converts the relative displacement into a capacitance value signal and transmits the capacitance value signal to the conversion circuit;
the conversion circuit converts the capacitance value signal into a pulse signal and transmits the pulse signal to the amplification circuit chip;
the amplifying circuit chip converts the pulse signal into a displacement magnitude value, obtains the area size of the circle to be detected through a circle area calculation formula and then sends the area size to the display screen;
the display screen shows the measurement data of the area of the circle to be measured.
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| CN202111416835.1A CN114353660A (en) | 2021-11-25 | 2021-11-25 | Circle area measuring device and method |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2175406Y (en) * | 1993-11-12 | 1994-08-24 | 合肥工业大学 | Digital instrument for measuring furrow |
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