Manufacturing method for dual-body vibration type sensor, and built-in tuning fork type vibrating plate sensor

Abstract

A manufacturing method for a dual-body vibration type sensor. A sensor comprises a probe vibration body, a tuning fork vibration body, a tuning fork protective steel tube, a base and two ceramic piezoelectric elements, wherein the probe vibration body is rigidly connected to the tuning fork vibration body; the tuning fork vibration body is arranged in the tuning fork protective steel tube; the probe vibration body is arranged at a front end of the tuning fork protective steel tube; the two ceramic piezoelectric elements are respectively arranged on the tuning fork vibration body in the tuning fork protective steel tube and on the probe vibration body; and in the sensor, only the probe vibration body at the front end of the tuning fork protective steel tube participates in detection. A built-in tuning fork type vibrating plate sensor manufactured according to the manufacturing method comprises a probe vibration body, a built-in tuning fork, a tuning fork protective steel tube, a base, ceramic piezoelectric elements and a self-excited oscillation control switch module, wherein the probe vibration body is a vibrating plate; and the built-in tuning fork comprises a tuning fork vibration body.

Description

A method for manufacturing a dual-body vibration sensor and a built-in tuning fork vibration plate sensor Technical Field The present invention belongs to the field of measuring instruments and relates to a double-vibration body type sensor with two connected vibrating bodies. The invention relates to a built-in tuning fork type vibration plate sensor with a manufacturing method and a vibration plate and a vibration rod as a probe. Background Art When measuring the level height of liquid substances and powder materials, it is often necessary to accurately measure their level. In the prior art, the height can be measured by using a sensor probe to generate vibration. When measuring the surface of an object, its vibration amplitude decreases sharply, and this amplitude change is converted to Converted into electrical signal output value changes to achieve level measurement and control procedures. There are two types of sensors currently sold on the market: tuning fork vibration type and single rod vibration type. The vibration sensor is a symmetrical vibration unit sensor, and the single rod vibration sensor is an asymmetrical vibration unit sensor. Sensor, both sensors are tuning fork body directly contact the object to be measured. When measuring the level height of liquid substances and powder materials, it is often necessary to accurately measure its level. In the prior art, the height can be measured by using a tuning fork probe to generate vibration. When measuring the surface of an object, its vibration amplitude decreases sharply, and this amplitude change is converted to Converted into electrical signal output value changes to achieve level measurement and control procedures. Technical issues There are two types of sensors currently sold on the market: tuning fork vibration type and single rod vibration type. The vibration sensor is a symmetrical vibration unit sensor, and the single rod vibration sensor is an asymmetrical vibration unit sensor. Sensor, both sensors are placed in contact with the object being measured, and both tuning forks have impact resistance. Poor, short service life, large size, limited application range, all use tuning forks as probes, complex structure Therefore, it is necessary to design a sensor that can be used in small spaces and can be more precise. Accurate measurement, smaller size, high impact resistance, long service life, simple production process, low cost, good stability New plate single vibration probe sensor Technical Solutions The sensing principle of the technical method of the present invention is shown in Figure 1, which shows the working principle and manufacturing method of the sensor. As shown, the probe vibrator 1 for detecting the object, the tuning fork vibrator 2, the tuning fork protection steel pipe 3, the sensor base 4, Ceramic piezoelectric element 5, ceramic piezoelectric element 6, self-excited oscillation control switch module 7, constitute an integrated machine Mechanical electronic detection circuit, ceramic piezoelectric element 5 senses the vibration frequency of the probe vibrator 1, ceramic piezoelectric element 6 The vibration of the inductive tuning fork vibrator 2, the probe vibrator 1 is rigidly connected to the tuning fork vibrator 2, and the module 7 is grounded. Common terminal, output terminal and input terminal, ceramic piezoelectric element 5 is pasted on the probe vibrator 1, and connected to the output terminal. The ceramic piezoelectric element 6 is attached to a tuning fork of the tuning fork vibrator, and the connection line is connected to the input end. When the circuit is connected, the probe vibrator 1 and the tuning fork vibrator 2 vibrate in connection, and the probe vibrator vibrates weakly. The resonance of the tuning fork vibrator can maintain the self-excited oscillation of the entire circuit. When the probe vibrator 1 contacts the object to be measured, Damping causes the vibration frequency of the ceramic piezoelectric element to deviate from the vibration frequency of the ceramic piezoelectric element 6, and the circuit voltage drops sharply. A detection signal is emitted. As shown in Figures 2 and 3, according to

[0005] A method for manufacturing a double-body vibration sensor A built-in tuning fork vibration plate sensor includes a probe vibrating body 1, which can be a single vibrating rod or a vibrating plate (such as Figure 2 Figure 3 of the vibration plate 1), the tuning fork vibrator 2, (such as the built-in tuning fork 2 in Figure 2), the tuning fork Protective steel pipe 3, base 4, two ceramic piezoelectric elements 5 and 6, forming the probe of the dual-body vibration sensor As shown in FIG2 , the probe vibrator 1 is connected to the tuning fork protection steel pipe 3 to form the probe part. The tuning fork vibrator 2 is built into the tuning fork protection steel tube 3 and welded to the vibrator 1 in the tube. The tuning fork vibrator 2 is supported by the tuning fork protection steel tube 3 and the base 4. Ceramic piezoelectric elements 5 and 6, a ceramic piezoelectric element 5 is attached to the probe inside the tuning fork protection steel tube 3 On the vibrating body 1, another ceramic piezoelectric element 6 is attached to the tuning fork vibrating body 2, and on the vibrating body 1 of the probe The ceramic piezoelectric element is connected to the excitation signal output end of the oscillation circuit, and the ceramic piezoelectric element on the tuning fork vibrator 2 is connected to the signal feedback input end of the oscillation circuit, forming a probe vibrator 1 and a tuning fork protection steel pipe 3. The detection probe part is a double-body vibration sensor. The present invention is achieved by the following technical solutions: As shown in Figure 1 of the specification, a built-in tuning fork vibration plate sensor includes a vibrating body 1 The detection vibration plate 1, the built-in tuning fork 2 of the vibration body 2, the tuning fork protection steel pipe 3, the base 4 and the ceramic piezoelectric The probe part is composed of an element 5 and a ceramic piezoelectric element 6, and is characterized in that the vibration plate 1 is welded with a tuning fork to maintain At the front end of the protective steel pipe 3, the built-in tuning fork 2 is welded to the detection vibration plate 1 inside the pipe to form a double-body connected vibration The vibration plate 1 and the built-in tuning fork 2 vibrate together, and the two ceramic piezoelectric elements 5 installed in the tube and 6, pasted on the lower end of the outer side of a tuning fork 3 and the lower outer side of another tuning fork 3, vibrating The ceramic piezoelectric element 5 on the plate 1 is connected to the excitation signal output terminal of the oscillation circuit, and the ceramic piezoelectric element on the tuning fork is connected to the excitation signal output terminal of the oscillation circuit. Component 6 is connected to the signal feedback input end of the oscillation circuit and connected to the base 4 to form a steel pipe probe front end vibration Plate 1 is a dual-body (vibration plate 1 and built-in tuning fork 2) vibration sensor with detection elements. The probe (vibration plate or vibrating rod) and tuning fork of the double-body vibration sensor of this vibration probe can be made into different shapes according to different usage occasions. Probe vibrators and tuning forks with the same diameter and different lengths and a resonance frequency ranging from 30 to 1000 Hz. In this sensor, the ceramic piezoelectric element is placed on the vibration plate and tuning fork inside the steel pipe probe and is not affected by the probe steel pipe. Impact, overcome the tuning fork and vibrating rod sensor probe can not withstand large impact, the probe can not be small The defects of chemical and complex manufacturing process. Beneficial effects This technical solution embodies the positive benefits of the method of the present invention. After the tuning fork is built in, it overcomes the problems of similar vibration transmission methods. The probe is impact-resistant and durable; the built-in small tuning fork resonator Vibration drives the probe vibrator 1 (plate vibration or vibrating rod) to vibrate, realizing the control signal conversion when detecting an object, so it can be made into sensors of various sizes, large or miniature, suitable for The double-body vibration sensor with built-in tuning fork vibration plate or vibration rod probe for various detection scenarios has good stability, high detection accuracy, simple manufacturing process, low material cost, high production efficiency, and can be mass-produced. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is the working principle diagram of the dual vibrating body sensor Figure 2 is an outline diagram of the built-in tuning fork vibration plate sensor; Figure 3 is a cross-sectional view of the built-in tuning fork vibration plate sensor. Best Mode for Carrying Out the Invention The probe vibrator 1 and the tuning fork vibrator 2 for detecting objects of the present invention are connected by steel means such as welding and are elastically connected to the tuning fork protection steel pipe 3. The best implementation is that the natural vibration frequency of the probe vibrator connecting the tuning fork and the tuning fork protection pipe is equal to or close to the vibration frequency of the tuning fork vibrator. The vibration probe is not limited to a vibration plate or a vibration rod. It is better if its natural vibration frequency can be reduced when it contacts the material to measure the switch signal. In Figures 2 and 3, the diameter of the vibration plate 1 is determined by the inner diameter of the tuning fork protection steel tube 3: 3~500mm, and the micro can Smaller, the thickness of the steel plate is determined by the vibration frequency and strength requirements: 0.1~5mm, the tuning fork protects the steel pipe 3. The outer diameter and length can be determined according to the installation design. The built-in tuning fork 2 is a rectangular steel plate, corresponding to the vibration The size and resonant frequency of the dynamic plate 1 determine the length l, width s and thickness t of the design plate, and the tuning fork 2 after the connection The natural vibration frequency of the vibration plate 1 is close to the natural vibration frequency of the tuning fork 2, which is the best. Welded to the bottom of the tuning fork protection steel pipe 3, with built-in tuning fork 2 symmetrically spaced 0.5mm + welded inside the pipe for vibration The ceramic piezoelectric element is attached to the lower part of the tuning fork and the opposite tuning fork. On the lower side of the vibration plate 1, after wiring, the vibration plate 1 and the tuning fork are installed in the steel pipe probe. After welding, the steel pipe probe The other end of the head is welded to the base 4, and the ceramic piezoelectric element 5 on the vibration plate is connected to the excitation signal of the oscillation circuit. The ceramic piezoelectric element 6 on the tuning fork is connected to the signal feedback input end of the oscillation circuit. When the control board is powered on, the weak vibration signal of the ceramic piezoelectric element of the vibration plate is fed back to the tuning fork ceramic through the oscillation circuit. The piezoelectric element and the tuning fork generate continuous resonant vibration, which drives the vibration plate to vibrate continuously. When the vibration plate contacts the material, Due to the damping effect of the material, the tuning fork stops vibrating and outputs a switching signal. Industrial Applicability The miniature vibration sensors of various shapes and sizes of probes manufactured according to the present invention have simple design structure, low production cost, wide application occasions, high test accuracy and good working stability.

Claims

1. A method for manufacturing a dual-body vibration sensor, comprising a vibrating body (1), a tuning fork vibrating body (2), and a tuning fork vibrating body (3). The protective steel pipe (3), the base (4), the ceramic piezoelectric element (5) and the ceramic piezoelectric element (6) constitute the transmission The sensor probe part is characterized in that The probe vibrating body (1) and the inner tuning fork vibrating body (2) are connected by steel. The vibrating body of the probe (1) is connected to the steel pipe (3) with a rigid connection, and the outside is the detection part. The vibrating body (2) is built into the tuning fork protection steel tube (3), and the ceramic piezoelectric element (5) is attached to the probe. The vibrating body 1 and the ceramic piezoelectric element (6) are attached to the tuning fork vibrating body (2).

2. A method for manufacturing a dual-body vibration sensor according to claim 1, wherein the Tuning fork vibration plate sensor, including vibration plate, built-in tuning fork, protective steel tube, ceramic piezoelectric element and a base, characterized in that Vibration plate (1) welded tuning fork protection steel pipe (3) front end, built-in tuning fork (2) Welded to the detection vibration plate (1) in the tube to form a double-body connected vibration body combination, the vibration plate (1) and the built-in tuning fork (2) vibrate together, and the ceramic piezoelectric element (5) and the ceramic The piezoelectric element (6) is attached to one tuning fork (3) and the lower vibration plate (1) on the other side, vibrating The ceramic piezoelectric element (5) on the plate (1) is connected to the excitation signal output end of the oscillation circuit, and the The ceramic piezoelectric element (6) is connected to the signal feedback input end of the oscillation circuit and connected to the base (4) to form a The front end vibration plate of the steel pipe probe (1) is a built-in tuning fork of the detection element 2) The built-in tuning fork vibration Board sensor.

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