Displacement sensor
By designing an improved displacement sensor, including a probe needle, spring, measuring blade and temperature measurement module, the problems of low accuracy and poor anti-interference ability of traditional sensors are solved, and higher accuracy and more accurate micro deformation monitoring are achieved. Provides more reliable data support for shock absorber performance evaluation and building structure seismic design.
Patent Information
- Application Number
- CN202421015477.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-11
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-05-11
AI Technical Summary
When traditional displacement sensors monitor deformation of the working direction of the shock absorber, they have problems such as low accuracy, slow response speed and poor anti-interference ability, which are difficult to meet industry standards.
A displacement sensor including a detection needle, a spring, a measuring piece, a support and a housing is designed. By improving the structure and circuit of the measuring piece, the temperature measurement module is added, and the error caused by temperature is corrected using experimental data to improve the measurement accuracy.
It achieves higher accuracy and more accurate tiny deformation monitoring, reduces system errors caused by temperature drift, and provides more reliable data support for shock absorber performance evaluation and building structure seismic design.
Smart Images
Figure CN222481434U_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of sensors, and in particular to a displacement sensor. Background Art
[0002] Earthquakes are natural disasters with huge impacts, posing a great threat to human life and property. In order to reduce the damage caused by earthquakes to buildings and various facilities, seismic isolation technology has gradually emerged and developed rapidly.
[0003] As the core device in seismic isolation technology, shock absorbers undertake the important task of reducing the vibration response of building structures. The horizontal and vertical vibrations caused by earthquakes will have a huge impact on building structures, and shock absorbers can use their own deformation to offset part of the energy. Therefore, the deformation of the shock absorber in its working direction is one of the important performance indicators of its resistance to earthquake effects. By monitoring the deformation of the shock absorber in the working direction, the working status of the shock absorber during an earthquake can be understood in a timely manner, providing important data support for evaluating the performance of the shock absorber and providing a scientific basis for the seismic design and maintenance of building structures.
[0004] However, traditional displacement sensors have some limitations when monitoring the deformation in the working direction of the shock absorber, such as low accuracy, slow response speed, poor anti-interference ability, etc., which make it difficult to meet industry standards. Therefore, the displacement sensor needs to be improved in design to obtain better monitoring results. The displacement sensor is required to have higher accuracy and be able to more accurately monitor the tiny deformation in the working direction of the shock absorber under temperature changes and other environments, thereby providing more reliable data support for shock absorber performance evaluation and building structure seismic design. Summary of the invention
[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:
[0006] The utility model provides a displacement sensor, comprising a detection needle, a spring, a measuring sheet, a support and a housing;
[0007] The housing comprises a long strip base and baffles respectively arranged at both ends of the long strip base; a support is arranged at one end of the long strip base as a head, and there is a gap between the support and the baffle at the head, and the other end of the long strip base is a tail; two measuring sheets are arranged side by side on one side of the support close to the baffle at the head, and there is a gap between the two measuring sheets; the measuring sheets are connected to an external display through a wire;
[0008] A circular hole is provided on the baffle plate, and the detection needle is mounted on the outer shell after passing through the circular holes on the baffle plates at both ends of the long strip base and the gap between the two measuring sheets, and the probe of the detection needle extends out from the circular hole of the baffle plate at the head of the long strip base; the two springs are respectively located on both sides of the detection needle and are parallel to the detection needle, one end of the two springs is fixed at the middle position of the detection needle, and the other end is respectively fixed on the two measuring sheets.
[0009] As a preferred solution of the utility model, the two measuring sheets are arranged side by side in the same plane, and the plane where the measuring sheets are located is parallel to the plane where the baffle at the head of the long strip base is located.
[0010] As a preferred solution of the utility model, a temperature measuring module is also arranged on the long strip base, and the temperature measuring module is connected to an external display via a wire. Further, the temperature measuring module includes an integrated thermistor and a temperature transmitter.
[0011] As a preferred solution of the utility model, the measuring sheet includes an elastic sheet and two resistance strain gauges fixed on the front and back surfaces of the elastic sheet.
[0012] As a preferred solution of the utility model, a vertically downward bolt A is fixed in the middle section of the detection needle, and a bolt B perpendicular to the detection needle is added on the top of the bolt A to form a T-shaped symmetrical structure with the bolt B and the bolt A, and the two ends of the bolt B are respectively connected to one end of the two springs.
[0013] As a preferred solution of the utility model, a slide rail is further provided on the long strip base, and the lower end of the bolt A is arranged on the slide rail.
[0014] Compared with the prior art, the utility model has the following beneficial effects:
[0015] The utility model obtains the change of the ambient temperature when the displacement sensor is working, uses experiments to obtain the length change of each element in the displacement sensor caused only by the temperature change, takes into account the error caused by the temperature in the sensor measurement process, and improves the accuracy.
[0016] The utility model changes the strain gauge into two parts, and adds bolts and springs to form a new half-bridge circuit, which forms two circuits with the existing circuit, thereby reducing the influence of stress concentration, improving the measurement accuracy of the strain gauge, and achieving better measurement effect.
[0017] In the utility model, two completely identical measuring pieces are arranged to obtain two groups of data at the same time, thereby reducing the system error caused by temperature drift. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 : Schematic diagram of the displacement sensor structure of the utility model.
[0019] Figure 2 : A schematic diagram of the utility model displacement sensor connected to an external display via a wire.
[0020] Figure 3 : The elastic sheet of the utility model is inserted into the gasket position diagram.
[0021] Figure 4 : Schematic diagram of displacement and temperature data processing involved in the utility model. DETAILED DESCRIPTION
[0022] The present invention is further described and illustrated below in conjunction with specific embodiments. The embodiments are merely exemplary of the present disclosure and do not define the scope of limitation. The technical features of each embodiment of the present invention may be combined accordingly without conflicting with each other.
[0023] like Figure 1 As shown, the displacement sensor of the utility model is composed of a detection needle 1, a measuring piece 2, a base 3, a spring 5, a guide rail 6, and a housing 7, forming a basic frame. The housing 7 includes a long strip base and baffles respectively arranged at both ends of the long strip base, and the detection needle passes through the central circular hole of the front and rear baffles. A bolt A is fixed at a certain position in the middle of the detection needle, and a bolt B perpendicular to the bolt A is added on the top of the bolt A to form a T-shaped structure, and two completely identical springs are connected to both ends of the top bolt B. One end of the spring is fixed on the bolt, and the other end is connected to the measuring piece. The spring is parallel to the detection needle and can change in length as the detection needle moves. A slide rail is also provided on the long strip base, and the lower end of the bolt A is set on the slide rail.
[0024] The base is fixed near the front end of the metal shell. The measuring piece includes an elastic sheet and a resistance strain gauge. The lower end of the elastic sheet is inserted into the gasket for fixing. The gasket and the base are glued together. In the traditional displacement sensor, the two parts of the gasket are connected together; the resistance strain displacement sensor of the utility model separates the two parts and presses them into the lower part of the gasket respectively. Figure 2 As shown, two measuring sheets are arranged side by side in the same plane, and the plane where the measuring sheets are located is parallel to the plane where the baffle plate at the head of the long strip base is located; wherein the resistance strain gauge on the elastic sheet is connected to the display through a wire to form a loop, so that the measured displacement data is displayed on the display. A temperature measurement module is also arranged on the long strip base, and the temperature measurement module is connected to the external display through a wire; the temperature measurement module includes an integrated thermistor and a temperature transmitter.
[0025] like Figure 4 As shown, in order to more clearly express the working process of the above device, this embodiment also provides a detection method of a displacement sensor, which is as follows:
[0026] 1) The displacement sensor of the utility model is set at the position to be measured of the object, and the resistance strain gauge and the temperature measurement module are connected to the external display through wires;
[0027] 2) When the displacement of the object to be measured changes, the detection needle will move, and the lower end of bolt A will slide along the slide rail;
[0028] 3) As the detection needle moves backward, it drives bolt B to move together, and the end of the spring fixed to bolt B also moves, so that the spring generates elastic force;
[0029] 4) The elastic force of the spring causes the resistance strain gauge to deform, thereby causing the resistance value to change, and the wire transmits the resistance value change signal to the external display; at the same time, the temperature measuring resistor transmits the temperature information to the external display through the wire;
[0030] 5) Obtain accurate displacement change in an external display based on the resistance change signal and temperature information.
[0031] As attached Figure 3 As shown, in a specific embodiment of the utility model, two resistance strain gauges are respectively fixed on the front and back sides of the left elastic sheet such as a platinum sheet, and the other two resistance strain gauges are placed on the front and back sides of the right elastic sheet in the same manner. The resistance strain gauges and external fixed value resistors, signal conditioning, display and power supply are connected in series with wires to form two half-bridge circuits.
[0032] The signal cable is used to connect the resistance strain gauge with the measuring equipment and transmit the resistance value change signal. The signal conditioning and display part includes filtering the noise and amplifying the electrical signal, so that the electrical signal becomes more stable and accurate after amplification, filtering, linearization and other processing. After conditioning, the electrical signal is ready for display. When connected to the external display part, the electrical signal can be displayed as a numerical value. At this time, the strain signals l1 and l2 obtained by the two half-bridge circuits can be obtained, and the average of the two can be taken to calculate the displacement change l3. The connector connects the signal cable to the interface part of the measuring equipment, the power supply provides power, and the wire connects the parts in series to complete the displacement measurement function. The frequency of displacement signal acquisition is moderate and is adjusted according to actual requirements.
[0033] The temperature measurement module is fixed in the middle of the base and does not affect the movement of bolt A on the slide rail. The temperature measurement module includes an integrated thermistor and a temperature transmitter, wherein the thermistor converts the temperature into a change in resistance, and the temperature transmitter changes the change in resistance into a change in an electrical signal, which is then displayed on the display. Specifically, two of the four wires of the temperature measurement module are connected to the positive and negative poles of the external power supply, and two are connected to the display, so that the temperature t can be displayed on the display.
[0034] According to the acquired displacement l3 and temperature t, combined with the nonlinear relationship between sensor displacement and temperature obtained in the previous experiment, the displacement value l4 at the temperature t is obtained, and the displacement l3 minus the l4 value is subtracted to obtain the final accurate displacement change.
[0035] The improved displacement sensor of the utility model can obtain better monitoring effect, and provide more powerful technical guarantee for the safety and reliability of earthquake-resistant engineering. This also helps to promote the continuous innovation and progress of earthquake-resistant technology, and provide more scientific technical support for the earthquake-resistant design and maintenance of building structures.
[0036] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. For ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.
Claims
1. A displacement sensor, characterized in that: It includes a detection needle, a spring, a measuring piece, a support and a housing; The housing comprises a long strip base and baffles respectively arranged at both ends of the long strip base; a support is arranged at one end of the long strip base as a head, and there is a gap between the support and the baffle at the head, and the other end of the long strip base is a tail; two measuring sheets are arranged side by side on one side of the support close to the baffle at the head, and there is a gap between the two measuring sheets; the measuring sheets are connected to an external display through a wire; The baffle is provided with a circular hole, and the detection needle is mounted on the outer shell after passing through the circular holes on the baffles at both ends of the long strip base and the gap between the two measuring sheets, and the probe of the detection needle extends out from the circular hole of the baffle at the head of the long strip base; the two springs are respectively located on both sides of the detection needle and are parallel to the detection needle, one end of the two springs is fixed at the middle position of the detection needle, and the other end is respectively fixed on the two measuring sheets.
2. The displacement sensor according to claim 1, characterized in that: The two measuring sheets are arranged side by side on the same plane, and the plane where the measuring sheets are located is parallel to the plane where the baffle plate at the head of the long strip base is located.
3. The displacement sensor according to claim 1, characterized in that: A temperature measuring module is also arranged on the long strip base, and the temperature measuring module is connected to an external display through a wire.
4. The displacement sensor according to claim 3, characterized in that: The temperature measurement module includes a thermistor and a temperature transmitter integrated together.
5. The displacement sensor according to claim 1, characterized in that: The measuring sheet comprises an elastic sheet and two resistance strain gauges fixed on the front and back surfaces of the elastic sheet.
6. The displacement sensor according to claim 5, characterized in that: The elastic sheet is inserted into the gasket for fixation, and the gasket is fixed to the base.
7. The displacement sensor according to claim 1, characterized in that: A bolt A is fixed vertically downward in the middle of the detection needle, and a bolt B is added on the top of the bolt A and is perpendicular to the detection needle. The bolt B and the bolt A form a T-shaped structure, and both ends of the bolt B are respectively connected to one end of the two springs.
8. The displacement sensor according to claim 3, characterized in that: The temperature measuring module is arranged in the middle of the long strip base.
9. The displacement sensor according to claim 1, characterized in that: The long strip base is also provided with a slide rail, and the lower end of the bolt A is arranged on the slide rail.
10. The displacement sensor according to claim 1, characterized in that: The measuring pieces located on both sides of the detection needle are relatively independent and do not affect each other.