Short-stroke high-precision linear displacement sensor
By arranging the excitation coil and the induction coil side by side on the PCB circuit board and combining single-cycle and multi-cycle signals, the problems of short stroke and easy deformation of traditional reed switch linear displacement sensors are solved, and short-stroke and high-precision displacement measurement is achieved.
Patent Information
- Application Number
- CN202422717746.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-08
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2034-11-08
AI Technical Summary
Traditional reed switch linear displacement sensors have a short travel range and are prone to structural deformation, which affects measurement accuracy and lifespan.
By using excitation coils and induction coils arranged side by side on a PCB circuit board, combining single-cycle and multi-cycle signals, and using coils with different numbers of cycles in conjunction with index signals to measure position, the measurement accuracy is increased.
It realizes high-precision displacement measurement under short stroke, and improves the measurement accuracy and service life of the equipment.
Smart Images
Figure CN223400318U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of displacement sensors, in particular to a short-stroke high-precision linear displacement sensor. Background Art
[0002] The function of a linear displacement sensor is to convert linear mechanical displacement into an electrical signal. To achieve this effect, a variable resistor slide is usually placed at a fixed position on the sensor, and different resistance values are measured by the displacement of the slider on the slide. The sensor slide is connected to a steady-state DC voltage, allowing a small current of microamperes to flow through it. The voltage between the slider and the starting end is proportional to the length of the slider movement.
[0003] Displacement is measured through resistance changes, and sensor output is achieved through changes in voltage signals. It has the advantages of high reliability, precise positioning, compact structure, long service life, and low price. However, there are still some shortcomings. This device is a traditional reed switch type, so the measurement distance will be limited by the built-in rod, resulting in a short travel range of the measured object. At the same time, the long-term tension and compression of the internal spring can easily cause structural deformation, affecting the service life of the equipment and measurement accuracy. Utility Model Content
[0004] The purpose of the present invention is to provide a short-stroke high-precision linear displacement sensor to address the existing technical defects and solve the problems raised in the above background technology.
[0005] In order to solve the above technical problems, the present utility model provides the following technical solutions: a short-stroke high-precision linear displacement sensor, comprising a PCB circuit board, the PCB circuit board comprising an excitation coil, a first induction coil and a second induction coil, wherein the first induction coil and the second induction coil are arranged side by side on the same plane, and the excitation coil is arranged around the outside of the first induction coil and the second induction coil.
[0006] Furthermore, the first induction coil and the second induction coil are respectively provided with a first metal target block and a second metal target block, and the first metal target block and the second metal target block are provided on the mobile carrier and are arranged side by side on the same plane.
[0007] Furthermore, the first metal target block and the second metal target block respectively correspond to a single conductive coupling segment.
[0008] Furthermore, the first induction coil and the second induction coil correspond to a single-cycle signal and a multi-cycle signal, respectively. The single-cycle signal has low accuracy and is used as an index signal, while the multi-cycle signal has high accuracy. The index signal is used to determine the period segment in which the multi-cycle signal is located. Each period segment is calibrated separately to avoid the problem of poor coil consistency. The calibration parameters of the corresponding period segment are retrieved separately to measure and calculate the position of the mobile carrier.
[0009] Furthermore, the mobile carrier is equipped with a travel slide.
[0010] Furthermore, the PCB circuit board cover is provided with a protective shell, and the protective shell is provided with an electrical connector.
[0011] Compared with the existing technology, the beneficial effects achieved by the present invention are: short stroke and high precision, the use of dual coils with different cycle numbers, the use of evaluation circuits to complete the acquisition of two induction coils, and the use of back-end algorithms to increase product measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:
[0013] Figure 1 It is a schematic diagram of the internal structure of the utility model;
[0014] Figure 2 It is an overall schematic diagram of the utility model;
[0015] Figure 3 It is a partial schematic diagram of the utility model;
[0016] Figure 4 It is a schematic diagram of the two induction coil cycles of the present utility model;
[0017] In the figure: 1. PCB circuit board; 2. excitation coil; 3. first induction coil; 4. second induction coil; 5. first metal target block; 6. second metal target block; 7. mobile carrier; 8. travel slide; 9. protective shell; 10 electrical connector. DETAILED DESCRIPTION
[0018] The following is a non-limiting detailed description of the technical solution of the present invention in conjunction with preferred embodiments and their accompanying drawings. Obviously, the described embodiments are only a portion of the embodiments of the present invention, and not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.
[0019] See also Figure 1-3 The utility model provides a technical solution: a short-stroke high-precision linear displacement sensor, including a PCB circuit board 1, the PCB circuit board 1 includes an excitation coil 2, a first induction coil 3 and a second induction coil 4, wherein the first induction coil 3 and the second induction coil 4 are arranged side by side on the same plane, and the excitation coil 2 is arranged around the outside of the first induction coil 3 and the second induction coil 4.
[0020] It should be noted that there can be one or two excitation coils 2. When there is one excitation coil 2, the excitation coil 2 is arranged around the outside of the first induction coil 3 and the second induction coil 4 at the same time; when there are two excitation coils 2, there is an excitation coil 2 around the outside of the first induction coil 3 and the second induction coil 4 respectively.
[0021] The first induction coil 3 and the second induction coil 4 are respectively provided with a first metal target block 5 and a second metal target block 6 . The first metal target block 5 and the second metal target block 6 are provided on a mobile carrier 7 and are arranged side by side on the same plane.
[0022] The first metal target block 5 and the second metal target block 6 respectively correspond to a single conductive coupling segment, and the first metal target block 5 and the second metal target block 6 are isolated by insulating materials.
[0023] The first induction coil 3 and the second induction coil 4 correspond to a single-cycle signal and a multi-cycle signal, respectively. The single-cycle signal has low accuracy and is used as an index signal, while the multi-cycle signal has high accuracy. The index signal is used to determine the period segment in which the multi-cycle signal is located. Each period segment is calibrated separately to avoid the problem of poor coil consistency. The calibration parameters of the corresponding period segments are retrieved separately to measure and calculate the position of the mobile carrier 7, and the position accuracy is higher.
[0024] The mobile carrier 7 is equipped with a travel slide 8 .
[0025] The PCB circuit board 1 is covered with a protective shell 9 , and an electrical connector 10 is provided on the protective shell 9 .
[0026] like Figure 4 As shown, the first induction coil 3 corresponds to the output signal S1, which is a single-cycle signal, and the second induction coil 4 corresponds to the output signal S2, which is a multi-cycle signal with high precision and requires an index signal to obtain the absolute position.
[0027] During the equipment testing phase, an external wire is connected to the interior of the electrical connector 10, and the data transmission end of the device is connected to the receiving peripheral. The excitation coil 2 inputs a two-way alternating signal into the first induction coil 3 and the second induction coil 4, respectively. The period values of the first induction coil 3 and the second induction coil 4 are set to be mutually prime. Under this condition, the first induction coil 3 and the second induction coil 4 have different period values. When the mobile carrier 7 moves on the travel slide 8, it simultaneously drives the first metal target block 5 and the second metal target block 6 to move. At this time, the induced voltage of the first induction coil 3 and the second induction coil 4 begins to change. The distance moved by the mobile carrier 7 is calculated based on the collected voltage values.
[0028] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only used to facilitate the description of the present invention, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.
[0029] Finally, it should be pointed out that the above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art will appreciate that modifications may be made to the technical solutions described in the above embodiments, or that some of the technical features may be replaced with equivalents. Such modifications or replacements do not deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.
Claims
1. A short-stroke, high-precision linear displacement sensor, characterized by: include: PCB circuit board (1); The PCB circuit board (1) comprises an excitation coil (2), a first induction coil (3) and a second induction coil (4), wherein the first induction coil (3) and the second induction coil (4) are arranged side by side on the same plane, one or two excitation coils (2) are provided, and the excitation coils (2) are arranged around the outside of the first induction coil (3) and the second induction coil (4).
2. A short-stroke, high-precision linear displacement sensor according to claim 1, characterized in that: The first induction coil (3) and the second induction coil (4) are respectively provided with a first metal target block (5) and a second metal target block (6).
3. The short-stroke high-precision linear displacement sensor according to claim 2, characterized in that: The first metal target block (5) and the second metal target block (6) are arranged on a mobile carrier (7) and are arranged side by side on the same plane.
4. The short-stroke high-precision linear displacement sensor according to claim 3, characterized in that: The first metal target block (5) and the second metal target block (6) respectively correspond to a single conductive coupling segment, and the first metal target block (5) and the second metal target block (6) are isolated by insulating material.
5. The short-stroke high-precision linear displacement sensor according to claim 4, characterized in that: The first induction coil (3) and the second induction coil (4) correspond to a single-cycle signal and a multi-cycle signal, respectively. The single-cycle signal serves as an index signal, and the multi-cycle signal cooperates with the index signal to determine the cycle segment in which the multi-cycle signal is located. Each cycle segment is calibrated separately, and the calibration parameters of the corresponding cycle segment are retrieved to measure and calculate the position of the mobile carrier (7).
6. The short-stroke high-precision linear displacement sensor according to claim 5, characterized in that: The mobile carrier (7) is provided with a traveling slideway (8).
7. The short-stroke high-precision linear displacement sensor according to claim 1, characterized in that: The PCB circuit board (1) is covered with a protective shell (9), and an electrical connector (10) is provided on the protective shell (9).