A pull cord sensor that can measure three-dimensional length and angle

Abstract

This invention relates to the field of pull-string sensors, and in particular to a pull-string sensor capable of measuring three-dimensional length and angle. The sensor includes a base, a rear side plate connected to the back of the top of the base, a front side plate mounted on the front of the top of the base, a first angle sensor mounted on the back of the front side plate, a sensor shaft mounted on the back of the first angle sensor, and a positioning shaft mounted on the front of the rear side plate. The front end of the positioning shaft is connected to the sensor shaft. This device can operate in conjunction with the first angle sensor, the tilting base plate, and the second angle sensor. A one-dimensional pull-string sensor can be successfully used for three-dimensional measurement. With more test points, complex shape modeling can be performed, enabling the pull-string sensor to achieve three-dimensional length and angle measurement functions. Combined with a data processing unit, it can complete length and angle measurement and spatial modeling at any point in three-dimensional direction.

Description

Technical Field

[0001] This invention relates to the field of pull-cord sensors, and in particular to a pull-cord sensor capable of measuring three-dimensional length and angle. Background Technology

[0002] A traditional pull-string sensor is a device that measures one-dimensional length.

[0003] A pull-cord sensor mainly consists of a winding mechanism that provides the pull force, and a measuring mechanism that measures the rotation angle of the winding system and converts it into length. Traditional pull-cord sensors only have a single length measurement function. In addition, there is a long-angle sensor, which integrates an angle sensor with the pull-cord sensor to simultaneously measure both length and tilt angle.

[0004] The limitations of long-angle sensors are twofold: first, they can only provide angle measurements in the vertical direction; second, long-angle sensors require a very high degree of parallelism between the direction the pull rope is pulled out and the object being measured, which places high demands on installation. They can only partially measure the length of straight lines and the angle of vertical planes, and are completely unusable for irregular objects or objects that are not tilted to the vertical plane. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, we propose a pull-string sensor that can measure three-dimensional length and angle. This sensor enables three-dimensional length and angle measurement and, when used with data receiving and processing equipment, can perform length and angle measurement and spatial modeling at any point in three dimensions, thus solving the problems mentioned in the background technology.

[0006] To solve the above technical problems, the present invention provides the following technical solution: a pull-string sensor that can measure three-dimensional length and angle, including a base, a rear side plate connected to the back of the top of the base, a front side plate installed on the front of the top of the base, a first angle sensor installed on the back of the front side plate, a sensor shaft installed on the back of the first angle sensor, a positioning shaft installed on the front of the rear side plate, and the front end of the positioning shaft connected to the sensor shaft.

[0007] The positioning shaft has a winding wheel hinged to its front side, and a pull rope is wound on the winding wheel. The front side of the winding wheel is fixed to the sensor shaft.

[0008] Preferably, an inclined base plate is sleeved on the positioning shaft, a linkage rod is installed on the inclined base plate, and the end of the linkage rod away from the inclined base plate is sleeved on the pull rope.

[0009] Preferably, an angle sensor for measuring the rotation angle of the angle base plate is installed on the angle base plate, and a balancing component is installed on the angle base plate, wherein the balancing component and the angle sensor are symmetrically distributed about the positioning axis.

[0010] Preferably, the end of the pull rope away from the winding wheel is connected to a pull ring.

[0011] Preferably, the longest distance of the pull rope is two hundred meters.

[0012] Preferably, two levels are mounted on the top of the base, and the cross-sections of the two levels when viewed from above are arranged perpendicular to each other.

[0013] Preferably, a second angle sensor is provided at the bottom of the base, and the measuring axis of the second angle sensor passes through and is fixedly connected to the bottom of the base.

[0014] Preferably, both the positioning shaft and the sensor shaft are made of conductive materials, and a conductive slip ring is fitted on the positioning shaft.

[0015] Preferably, a pull-string sensor capable of measuring three-dimensional length and angle further includes a data processing unit for statistical analysis, processing, and data transmission and reception, and a user-held communication device. The data processing unit includes a data processing module, a display screen, and a data transceiver module. The information transmission end of the data processing module is connected to the display screen and the data transceiver module, respectively. The data transceiver module is equipped with Bluetooth and transmits information to the user-held communication device via Bluetooth.

[0016] Preferably, the data processing module's information receiving end is connected to three sets of signal lines, which are respectively connected to the first angle sensor, the conductive slip ring, and the second angle sensor.

[0017] Compared with the prior art, the beneficial effects that this invention can achieve are:

[0018] 1. This device can be operated in conjunction with a first angle sensor, an inclined base plate, and a second angle sensor. A one-dimensional pull rope sensor can be successfully used for three-dimensional measurement. With more test points, it can also model complex shapes, enabling the winding wheel to achieve three-dimensional length and angle measurement functions. With the data processing unit, it can complete the length and angle measurement and spatial modeling of any point in the three-dimensional direction.

[0019] 2. The device has a clever overall design and a small size, making it easy to carry, transport, disassemble, and assemble. It can be fixed in any position during use and its overall level can be adjusted to reduce overall errors. It is also more convenient to adjust the height, angle, and direction in space. Furthermore, the operator can remotely receive information data no matter where the pull ring is pulled. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram from a first perspective of the present invention;

[0021] Figure 2 This is a three-dimensional structural diagram from a second perspective of the present invention;

[0022] Figure 3 This is a three-dimensional structural diagram of the present invention from a third perspective;

[0023] Figure 4 This is a flowchart of the data processing unit of the present invention;

[0024] Figure 5 A schematic diagram illustrating the principle of actual three-dimensional testing of this invention;

[0025] Figure 6 This is a schematic diagram illustrating the principle of converting the pull-out direction and tilt angle sensor readings in this invention.

[0026] In the diagram: 1. Base; 11. Rear side plate; 12. Front side plate; 2. First angle sensor; 21. Sensor shaft; 3. Positioning shaft; 31. Conductive slip ring; 4. Tilt base plate; 41. Linkage rod; 42. Tilt sensor; 43. Balancing components; 5. Winding wheel; 51. Pull rope; 52. Pull ring; 6. Level; 7. Second angle sensor; 8. Data processing unit; 81. Data processing module; 82. Display screen; 83. Data transceiver module; 84. Signal line. Detailed Implementation

[0027] To make the technical means, creative features, and achieved objectives and effects of this invention easier to understand, the invention is further described below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of this invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0028] like Figure 1-6 As shown, a pull-string sensor capable of measuring three-dimensional length and angle includes a base 1, a rear side plate 11 connected to the back of the top of the base 1, a front side plate 12 mounted on the front of the top of the base 1, a first angle sensor 2 mounted on the back of the front side plate 12, a sensor shaft 21 mounted on the back of the first angle sensor 2, and a positioning shaft 3 mounted on the front of the rear side plate 11, with the front end of the positioning shaft 3 connected to the sensor shaft 21.

[0029] The positioning shaft 3 has a winding wheel 5 hinged to its front side, and a pull rope 51 is wound on the winding wheel 5. The front side of the winding wheel 5 is fixed to the sensor shaft 21.

[0030] In this embodiment, an inclined base plate 4 is sleeved on the positioning shaft 3, and a linkage rod 41 is installed on the inclined base plate 4. The end of the linkage rod 41 away from the inclined base plate 4 is sleeved on the pull rope 51.

[0031] In this embodiment, an inclination sensor 42 for measuring the rotation angle of the inclination base plate 4 is installed on the inclination base plate 4, and a balancing component 43 is installed on the inclination base plate 4. The balancing component 43 and the inclination sensor 42 are symmetrically distributed with the positioning axis 3 as the axis.

[0032] In this embodiment, a pull ring 52 is connected to the end of the pull rope 51 away from the winding wheel 5.

[0033] In this embodiment, the longest distance of the pull rope 51 is two hundred meters.

[0034] In this embodiment, two levels 6 are installed on the top of the base 1, and the cross-sections of the two levels 6 when viewed from above are arranged perpendicular to each other.

[0035] In this embodiment, a second angle sensor 7 is provided at the bottom of the base 1, and the measuring axis of the second angle sensor 7 passes through and is fixedly connected to the bottom of the base 1.

[0036] In this embodiment, both the positioning shaft 3 and the sensor shaft 21 are made of conductive materials, and a conductive slip ring 31 is fitted on the positioning shaft 3.

[0037] In this embodiment, a pull-string sensor capable of measuring three-dimensional length and angle also includes a data processing unit 8 for statistical analysis, processing, and data transmission and reception, and a user-held communication device. The data processing unit 8 includes a data processing module 81, a display screen 82, and a data transceiver module 83. The information transmission end of the data processing module 81 is connected to the display screen 82 and the data transceiver module 83, respectively. The data transceiver module 83 is equipped with Bluetooth and transmits information to the user-held communication device via Bluetooth.

[0038] In this embodiment, the data processing module 81 information receiving end is connected to three sets of signal lines 84, which are respectively connected to the first angle sensor 2, the conductive slip ring 31 and the second angle sensor 7.

[0039] Furthermore, there is a coil spring K between the inside of the winding wheel 5 and the fixed positioning shaft 3. One end of the coil spring K is fixed to the positioning shaft 3, and the other end is fixed to the inner wall of the winding wheel. The presence of the coil spring K ensures that the winding wheel B always has a torque that counteracts the pulling direction of the pull rope. This ensures that the pull rope always maintains a certain tension, so that the pull rope can always maintain a straight state when pulled out.

[0040] Furthermore, the tilting base plate 4 is mounted on the fixed shaft β via bearing F. The addition of bearings increases the stability of the connection between the tilting base plate 4 and the positioning shaft 3.

[0041] Furthermore, the display screen 82 can be selected as an electronic display screen, an LCD display screen, or other components for recording or displaying data.

[0042] The usage and installation process for this draw-wire sensor that measures three-dimensional length and angle is as follows:

[0043] The pull rope 51 on the winding wheel 5 is wound around the surface of the winding wheel 5. The winding wheel 5 is rigidly connected to the sensor shaft 21 of the first angle sensor 2. When the pull rope is pulled, the rotation of B will drive the sensor shaft 21 to rotate synchronously. In this way, the first angle sensor 2 can calculate the length of the pull rope 51 by detecting the rotation angle of the sensor shaft 21, multiplying it by the diameter of the winding wheel 5, and then multiplying it by π.

[0044] The sensor shaft 21 and the positioning shaft 3 of the winding wheel 5 are kept coaxial. The tilting base plate 4 is a structure that can rotate freely around the positioning shaft 3. The function of the tilting base plate 4 is to detect the tilt angle of the pulling direction of the pull rope 51.

[0045] The balancing component 43 is designed to ensure that when the pull rope is not pulled, it is symmetrical and gravity-balanced with the tilt sensor 42 on the tilt base plate 4. This prevents the tilt base plate 4 from rotating naturally. Furthermore, the balancing component 43 can be replaced with an electronic component of equal weight, such as a microcontroller, which combines tilt signal processing and balancing functions.

[0046] One end of the tilting base plate 4 is connected to the pull rope 51 via a linkage rod 41. This allows the tilting base plate 4 to tilt and rotate in the vertical direction as the pull direction of the pull rope 51 changes. A conductive slip ring 31 is mounted on the positioning shaft 3. The function of the conductive slip ring 31 is to transmit the tilt angle electrical signal collected by the tilting base plate 4 to the data processing unit 8. This ensures that no matter how the tilting base plate 4 tilts or rotates, the signal line 84 will not pull on the tilting base plate 4 or become entangled with the positioning shaft 3. In use, pulling the pull ring 52 drives the winding wheel 5 to pull the pull rope 51. When the angle of the pull rope 51 changes... When the pitch changes, the tilt base plate 4 is driven to change pitch through the linkage rod 41. The balancing element 43 attached to the tilt base plate 4 measures the tilt angle of the tilt base plate 4 in real time. Subtracting the fixed deviation angle (the calculation of the deviation angle is shown in Appendix 1) gives the pitch angle of the pull rope 51. The base 1 is connected to the second angle sensor 7. When the base 1 rotates in the horizontal direction, the second angle sensor 7 can identify and read the horizontal rotation angle. The two levels 6 can coarsely adjust the horizontal angle of the base 1 by the movement of the water droplets inside. The higher the accuracy of the horizontal rotation angle measured by the second angle sensor 7 when the base 1 is kept horizontal, the better.

[0047] Within the data processing unit 8, the data processing module 81 collects and processes various data (such as tilt sensor 42, first angle sensor 2, etc.) and submits the results to the display screen 82 or the data transceiver module 83. The display screen 82 allows the operator to clearly understand the actual data content, while the data transceiver module 83 can send the data to the operator at the end of the pull ring 52 for easy single-person operation.

[0048] Based on the working principle of this invention, practical operation is performed: (see...) Figure 5 )

[0049] Assume the device is installed at the lower left corner of the figure, and A and B are two points to be measured;

[0050] First, observe the two levels 6, roughly adjust the base 1 to be level, and then fix the whole thing relatively still.

[0051] The second step is to pull one end of the pull ring 52 to A. At this time, the total rotation angle of the winding wheel 5 is read by rotation. The length L1 of the pull rope (51) is obtained by using the formula: total length = total angle ÷ 360° × 2πR. The fixed correction amount is subtracted from the reading of the tilt sensor 42 (the correction amount can be as shown in the attached figure). Figure 6 The method shown (obtained during calibration) yields the inclination angle θ1 of the rope from O to A. With L1 and θ1, the elevation h1 of point A relative to point O can be obtained using trigonometric functions.

[0052] The third step is to pull one end of the rope 51 to point B. Then, following the method in the second step, we can obtain the length of the rope L2 and the inclination angle θ2 between points O and B, and then calculate the elevation H2 of point B relative to point O.

[0053] The fourth step is to record the rotation angle measured by the second angle sensor 7, which is the horizontal angle γ, during the process of pulling the rope from point A to point B.

[0054] The fifth step is comprehensive calculation. With the above test data, we can use trigonometric functions to comprehensively calculate the lengths of points A and B; the height difference between points A and B (which can be used to determine the levelness of points A and B); the angles between points A and B relative to point O, and other information.

[0055] In this way, a one-dimensional pull-string sensor can be successfully used for three-dimensional measurement. More test points can also be used to model complex shapes. These data are sent to the operator for recording and statistics through the data processing unit 8.

[0056] For further details regarding the conversion between the pull-out direction of the rope and the tilt sensor readings, please refer to the appendix. Figure 6 In the appendix Figure 6 In the image above, the letters have basically the same meaning as those in the appendix. Figure 2 β is Figure 1 The positioning shaft 3; D is the tilt sensor 42; C is the tilt base plate 4; E is the balancing component 43; G is the linkage rod 41, which is always wrapped with the pull rope 51; R is the radius of the winding wheel 5;

[0057] Appendix Figure 6 Both horizontal dashed lines are absolutely horizontal.

[0058] The positioning shaft 3, the point where the pull rope 51 and the winding wheel 5 are tangent, and the contact point G between the linkage rod 41 and the pull rope 51 together form a right triangle; the length from β to G is constant, and R is also constant, so we can find the constant angle δ.

[0059] As shown by the horizontal dashed line, we know that δ = λ + θ, and θ can be directly read from D. Therefore, the inclination angle of rope 51, λ = δ - θ, can be calculated. In this formula, the inclination angle of rope 51 is only related to one variable, θ, while the others are constants.

[0060] Furthermore, all the electronic components mentioned above can be selected from existing technologies that are available for purchase, can be used in this field, and can perform the corresponding functions. The specific model, size, and connection method can be selected according to the actual situation (for example, the data transceiver module 83 can be connected via Bluetooth, radio, or other wireless signal transmission methods).

[0061] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0062] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pull cord sensor capable of measuring three-dimensional length and angle, comprising a base (1), the back of the top of the base (1) is communicated with a back plate (11), characterized in that: A front side plate (12) is installed on the front of the top of the base (1), a first angle sensor (2) is installed on the back of the front side plate (12), a sensor shaft (21) is installed on the back of the first angle sensor (2), and a positioning shaft (3) is installed on the front of the rear side plate (11), with the front end of the positioning shaft (3) connected to the sensor shaft (21). Among them, the front of the positioning shaft (3) is hinged with a winding wheel (5), a pull rope (51) is wound on the winding wheel (5), and the front of the winding wheel (5) is fixed to the sensor shaft (21). An inclined base plate (4) is sleeved on the positioning shaft (3), and a linkage rod (41) is installed on the inclined base plate (4). The end of the linkage rod (41) away from the inclined base plate (4) is sleeved on the pull rope (51). An inclination sensor (42) for measuring the rotation angle of the inclination base plate (4) is installed on the inclination base plate (4), and a balancing component (43) is installed on the inclination base plate (4). The balancing component (43) and the inclination sensor (42) are symmetrically distributed with the positioning axis (3) as the axis. A second angle sensor (7) is provided at the bottom of the base (1), and the measuring axis of the second angle sensor (7) passes through and is fixedly connected to the bottom of the base (1). Among them, the sensor shaft (21) and the positioning shaft (3) of the winding wheel (5) are kept coaxial, and the tilting base plate (4) can rotate freely around the positioning shaft (3); the first angle sensor (2) detects the rotation angle of the sensor shaft (21).

2. The pull cord sensor capable of measuring three-dimensional length and angle according to claim 1, characterized in that: The end of the pull rope (51) away from the winding wheel (5) is connected to a pull ring (52).

3. The pull cord sensor capable of measuring three-dimensional length and angle according to claim 1, characterized in that: The longest distance of the pull rope (51) is two hundred meters.

4. The pull wire sensor capable of measuring three-dimensional length and angle according to claim 2, characterized in that: Two levels (6) are mounted on the top of the base (1), and the cross-sections of the two levels (6) when viewed from above are perpendicular to each other.

5. The pull wire sensor capable of measuring three-dimensional length and angle according to claim 4, characterized in that: The positioning shaft (3) and the sensor shaft (21) are both made of conductive materials, and a conductive slip ring (31) is fitted on the positioning shaft (3).

6. The pull cord sensor capable of measuring three-dimensional length and angle according to claim 5, further comprising a data processing unit (8) for statistics, processing and transceiving data, and a communication device held by a user, characterized in that: The data processing unit (8) includes a data processing module (81), a display screen (82), and a data transceiver module (83). The information transmission end of the data processing module (81) is connected to the display screen (82) and the data transceiver module (83) respectively. The data transceiver module (83) is equipped with Bluetooth and sends information to the communication device held by the user via Bluetooth.

7. The pull wire sensor capable of measuring three-dimensional length and angle according to claim 6, characterized in that: The data processing module (81) has three sets of signal lines (84) connected to its information receiving end. The three sets of signal lines (84) are respectively connected to the first angle sensor (2), the conductive slip ring (31) and the second angle sensor (7).

Images