Novel ultra-high-frequency and ultra-miniature impact sensor capable of being installed in hidden mode

Abstract

The utility model belongs to the technical field of high-frequency impact sensors, and particularly relates to a high-frequency impact sensor technology, the sensor comprises a pin, an insulation positioning block, an M3 mouthpiece, a positive electrode lead, a negative electrode lead, an expansion block, piezoelectric ceramics and a threaded shell, the expansion rate of the expansion block at high temperature is 2%, annular ceramics with grooves are arranged outside the expansion block, and when the expansion block is heated to expand, the piezoelectric ceramics are inserted into the threaded shell. When the annular ceramic is expanded outwards, the annular ceramic is extruded outwards, the threaded shell is arranged outside the annular ceramic and limits the annular ceramic to expand outwards, in this way, the expansion block, the ceramic and the threaded shell are fixed together to form a core structure of the impact sensor, and the positive electrode lead connecting contact pin is welded to the center of the expansion block. M6 thread design is adopted outside the shell, miniaturization and hidden installation of the impact sensor are achieved through the two designs, and the sensor can achieve 182K ultrahigh frequency response simulation performance.

Description

TECHNICAL FIELD

[0001] The utility model relates to high frequency impact sensor technical field especially relates to a novel impact sensor of super high frequency, super micro type, can hide installation. BACKGROUND

[0002] Impact sensor is a kind of sensor for detecting and measuring impact force or impact event. Its working principle is piezoelectric effect. Impact sensor is usually used in the mechanical impact monitoring of industrial field, collision test, vehicle collision test and other applications, so the general impact range is large, in order to improve the test accuracy, so it is necessary to impact sensor weight as much as possible, reduce the influence of sensor on the test result, and for some miniaturized impact test piece, installation position is narrow, and installation space is limited. If the size of sensor is too large, installation test cannot be carried out, so the miniaturization and hidden installation of impact sensor are also important directions of the development of impact sensor. The structure of traditional impact sensor includes two parts of inner shell and outer shell. The two shells are separated by insulation structure, which reduces the signal interference from the outside. The overall structure of traditional impact sensor includes outer shell, insulation sheet, inner base, inner shell cover, cable shell, center column, piezoelectric ceramic, mass block and alloy ring. It can be seen that the structure of traditional impact sensor is complex, which leads to the problems of complicated installation, large size and heavy weight of traditional impact sensor.

[0003] Therefore, there is an urgent need for an impact sensor with simple structure, small size, hidden installation, excellent frequency response performance and ground insulation function. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at solving the problems of complicated structure, complicated installation, large size and heavy weight of traditional impact sensor in the prior art, and provides a novel impact sensor of super high frequency, super micro type and hidden installation.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A novel impact sensor of super high frequency, super micro type and hidden installation comprises a pin.

[0007] The insulating positioning block, the mouthpiece, the positive electrode lead, the negative electrode lead, the piezoelectric ceramic, the expansion block and the threaded shell are connected movably outside the piezoelectric ceramic, the bottom of the expansion block is movably contacted with the mounting jig, the outer wall of the piezoelectric ceramic is contacted with the threaded shell, the third boss is contacted with the bottom of the piezoelectric ceramic, the threaded shell is a hollow structure, the inner wall of the threaded shell is provided with two threaded positions, which are M thread and M internal thread respectively, the third boss is movably contacted with the second boss, the inner wall of the mouthpiece is provided with the fourth boss, the insulating positioning block is matched with the mouthpiece, the bottom of the insulating positioning block is movably contacted with the top of the fourth boss, the insulating positioning block is a circular ring, the material of the insulating positioning block is insulating material, the pin is a hollow structure, the inner wall of the mouthpiece is provided with the first boss, one end of the positive electrode lead is fixedly connected with the bottom of the pin, the other end of the positive electrode lead is fixedly connected with the top of the expansion block, serving as a signal line, one end of the negative electrode lead is fixedly connected with the bottom of the mouthpiece, the other end of the negative electrode lead is fixedly connected with the side corresponding to the piezoelectric ceramic and the threaded shell, serving as a ground wire.

[0008] As a preferred scheme of the utility model, the expansion block is memory metal material, and the expansion block is a cylindrical structure.

[0009] As a preferred scheme of the utility model, the piezoelectric ceramic is a slotted circular ring structure, and the height is less than the expansion block.

[0010] As a preferred scheme of the utility model, the threaded shell is aluminum alloy material, and the shell is subjected to strong anodic oxidation treatment.

[0011] As a preferred scheme of the utility model, the mouthpiece is an annular structure with different diameters from top to bottom, and the mouthpiece is respectively provided with M external thread and M external thread.

[0012] As a preferred scheme of the utility model, the inner wall of the mouthpiece is provided with fixing glue, and the positive electrode lead and the negative electrode lead are fixedly connected to the inner wall of the mouthpiece through the fixing glue. Beneficial effects

[0013] 1, single shell and ground insulation structure design, the traditional impact sensor is a double-layer shell structure, and the insulating sheet between the two is used to realize the design of ground insulation, the sensor of the application selects a single-layer shell structure, the threaded shell is subjected to strong anodic oxidation, the ground insulation of the overall structure is realized, the mouthpiece and the threaded shell are installed as a whole by using the design of threaded rotation installation, and the problem that the aluminum alloy cannot be subjected to laser welding is solved.

[0014] 2. Core structure design of the central expansion block: The core structure of traditional impact sensors is a shrinking core, that is, the mass block and piezoelectric ceramic are shrunken and locked to the central column with an alloy ring to fix the core. The central column is connected to the base to transmit the vibration of the sensor. However, the present invention utilizes the expansion capacity of the expansion block to expand outward and lock the piezoelectric ceramic to fix the core. There is no central column design. Instead, a threaded shell acts as the central column to support the entire core. The expansion block acts as the mass block of the core. The threaded shell replaces the central column and shell structures. The expansion block replaces the mass block and alloy ring structures. This core structure greatly reduces the complexity of the sensor and simplifies the assembly process.

[0015] 3. Miniaturized design: Thanks to the structural design of single-layer shell and central expansion block, the overall size of the impact sensor of this invention is extremely small. The sensor size is measured to be 10.4 mm in height and 6 mm in diameter. Compared with the traditional impact sensor with a height of 50 mm, this invention can achieve a miniaturized design of the impact sensor.

[0016] 4. The structure design allows for concealed installation. The housing is combined with a threaded connection, and the outer shell is designed with a standard thread specification. This allows the housing part of the impact sensor to be screwed into the test piece during installation, leaving only the connector on the outside for connecting to the cable to transmit signals. Considering that the drilling depth of most M6 threaded holes in small test pieces is not deep, and screwing most of it into the threaded hole also conforms to the design of reducing the center of mass of the sensor, it is not necessary to screw the entire sensor into the M6 ​​threaded hole. Of course, if necessary, the external threaded hole can be extended.

[0017] 5. The impact sensor has an ultra-high frequency response. The impact sensor of this invention can reach a frequency response of 182K. Compared with conventional impact accelerometers, which have a maximum frequency response of about 70K, this invention improves the frequency response to 182K, which is a great improvement over traditional impact sensors.

[0018] 6. The assembly process is simple and the installation is convenient. This invention integrates the inner base and shell cover of the traditional impact sensor into one piece and designs it as a threaded shell. By utilizing the design of the central expansion block, the core structure is redesigned to replace the alloy ring and mass block of the traditional impact sensor. During installation, you only need to place the expansion block, ceramic, and threaded shell in place, invert it on the installation fixture, and heat it. Through the above design, the number of structural parts and assembly process is further reduced. The reduction of parts reduces the workload and operation difficulty of production personnel, and greatly reduces time costs.

[0019] 7. The shape is highly customizable. When the mounting surface has a threaded hole of other specifications, it can be changed to a threaded housing of the corresponding specifications. Attached Figure Description

[0020] Figure 1 The overall structural diagram of the impact sensor of the present application;

[0021] Figure 2 The mouth connecting diagram of the impact sensor of the present application;

[0022] Figure 3 The threaded shell diagram of the impact sensor of the present application;

[0023] Figure 4 The expansion block diagram of the sensor of the present application;

[0024] Figure 5 The explosion diagram of the sensor of the present application;

[0025] Figure 6 The size diagram of the impact sensor of the present application;

[0026] Figure 7 The core assembly diagram and the mounting jig diagram of the impact sensor of the present application;

[0027] Figure 8 The mounting schematic diagram of the impact sensor of the present application;

[0028] Figure 9 The simulated resonance frequency diagram of the impact sensor of the present application.

[0029] In the figure: 1, the pin; 2, the insulating positioning block; 3, the mouth; 4, the positive lead; 5, the negative lead; 6, the piezoelectric ceramic; 7, the expansion block; 8, the threaded shell; 9, the mounting jig; 10, the first boss; 11, the second boss; 12, the third boss; 13, the fourth boss; 14, the fixing glue. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. EMBODIMENT

[0031] Referring to Figures 1-9 A novel impact sensor of super high frequency, super micro type and hidden installation, comprising a pin 1, an insulating positioning block 2, a mouth 3, a positive lead 4, a negative lead 5, a piezoelectric ceramic 6, an expansion block 7, a threaded shell 8 and the expansion block 7;

[0032] The outer part of the expansion block 7 is movably connected with the inner wall of the piezoelectric ceramic 6, the bottom of the expansion block 7 movably contacts with a mounting jig 9, the outer wall of the piezoelectric ceramic 6 contacts with the threaded shell 8, the third boss 12 contacts with the bottom of the piezoelectric ceramic 6, the third boss 12 facilitates limiting the downward movement of the piezoelectric ceramic 6, the inner surface of the threaded shell 8 limits the continuous outward expansion of the piezoelectric ceramic 6 and the expansion block 7, under the action of the radial pre-tightening force applied to the piezoelectric ceramic 6 and the threaded shell 8 by the outward expansion of the expansion block 7, the expansion block 7, the piezoelectric ceramic 6 and the threaded shell 8 are firmly fixed together to form a core structure, the threaded shell 8 is a hollow structure, the inner wall of the threaded shell 8 is provided with two threaded positions, which are M6 threads and M5 internal threads respectively, the third boss 12 movably contacts with the second boss 11, this position is used for mounting the connector 3, after the connector 3 is screwed, the sensor as a whole can reach a sealed state, avoiding some signal interference from the outside, when the connector 3 is screwed downward into the threaded shell 8, the third boss 12 cannot continue to move downward when contacting the second boss 11, so that the top of the connector 3 is flush with the top of the threaded shell 8, the inner wall of the connector 3 is provided with a fourth boss 13, the insulating positioning block 2 is matched with the connector 3, the bottom of the insulating positioning block 2 movably contacts with the top of the fourth boss 13, when the lower surface of the insulating positioning block 2 contacts the fourth boss 13, the insulating positioning block 2 cannot continue to move downward, thereby fixing the insulating positioning block 2, the insulating positioning block 2 is in a circular ring shape, and the material of the insulating positioning block 2 is an insulating material, the insulating positioning block 2 facilitates fixing the pin 1 and insulating, the pin 1 is a hollow structure, the bottom of the pin 1 is sealed, and two slots are formed in the inner wall of the pin 1, thereby increasing the toughness of the pin 1 and making it easy to bend, reducing the friction loss when the pin 1 is connected with the external pin, the inner wall of the connector 3 is provided with the first boss 10, one end of the positive lead 4 is fixedly connected to the bottom of the pin 1, the other end of the positive lead 4 is fixedly connected to the top of the expansion block 7, serving as a signal line, one end of the negative lead 5 is fixedly connected to the bottom of the connector 3, the other end of the negative lead 5 is fixedly connected to the side corresponding to the piezoelectric ceramic 6 and the threaded shell 8, serving as a ground wire.

[0033] As a preferred scheme of the utility model, the expansion block 7 is memory metal material, and the expansion block 7 is in cylindrical structure, the volume of the expansion block 7 increases outward when heated, which facilitates fixing the piezoelectric ceramic 6 and the threaded shell 8, and the expansion rate of the expansion block 7 is about 2%.

[0034] As a preferred scheme of the utility model, the piezoelectric ceramic 6 is a slotted circular ring structure, and the height is less than that of the expansion block 7, the slotted design makes the piezoelectric ceramic 6 more easily bend, thereby increasing the flexibility of the piezoelectric ceramic 6, and the piezoelectric ceramic 6 has a certain outward bending ability when subjected to the outward pressure of the expansion block 7

[0035] As a preferred scheme of the utility model, the threaded shell 8 is of aluminum alloy material, and the shell is subjected to strong anodic oxidation treatment, so that the threaded shell 8 has the effect of grounding insulation.

[0036] As a preferred scheme of the utility model, the connector 3 is of an annular structure with different diameters in the upper and lower parts, and M3 external threads and M5 external threads are respectively arranged in the connector 3, the M3 threads are used for being connected with M3 connectors, and the M5 threads are screwed onto the threaded shell 8 to fix the connector 3.

[0037] As a preferred scheme of the utility model, the inner wall of the connector 3 is provided with fixing glue 14, and the positive lead 4 and the negative lead 5 are fixedly connected to the inner wall of the connector 3 through the fixing glue 14, so that the fixing glue 14 is used for fixing the sensor to prevent the welding point from falling off and the positive lead 4 and the negative lead 5 from shaking, and the signal stability is improved.

[0038] The working principle of the utility model is as follows: when being installed, the expansion block 7 is first placed on the installation jig 9, the installation jig 9 is of a cylindrical structure with two different diameters, the small-diameter cylinder is used for placing the expansion block 7 and the piezoelectric ceramic 6, the diameter is smaller than the diameter of the threaded shell 8 for installing the piezoelectric ceramic 6, and the large-diameter is greater than the external diameter of the M6 threads, so that the core body is conveniently placed and stabilized during installation, and the core body is conveniently moved by hand, the whole is not easy to be tilted, the piezoelectric ceramic 6 is sleeved into the expansion block 7 after the expansion block 7 is placed on the installation jig 9, and finally the threaded shell 8 is invertedly buckled to the outside of the piezoelectric ceramic 6 and the expansion block 7, so that according to the gravity, the first boss 10 of the threaded shell 8 contacts the bottom of the piezoelectric ceramic 6, at this time, they only need to be placed in a high-temperature oven and heated, after the temperature is reached, the expansion block 7 firmly fixes the core body.

[0039] The above is only a preferred specific implementation manner of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the technical field according to the technical scheme and the utility model concept of the utility model can make equivalent replacement or change within the technical range disclosed by the utility model, and all of them should be covered in the protection scope of the utility model.

Claims

1. A new type of impact sensor of ultra-high frequency, ultra-miniature, hidden installation, characterized in that, Include: Pin (1) ; Insulating positioning block (2), mouth (3), positive lead (4), negative lead (5), piezoelectric ceramic (6), expansion block (7) and threaded shell (8), the outer wall of the expansion block (7) is movably connected with the inner wall of the piezoelectric ceramic (6), the bottom of the expansion block (7) movably contacts with the mounting jig (9), the outer wall of the piezoelectric ceramic (6) contacts with the threaded shell (8), the third boss (12) contacts with the bottom of the piezoelectric ceramic (6), the threaded shell (8) is a hollow structure, the inner wall of the threaded shell (8) is provided with two threaded positions, which are M6 thread and M5 internal thread respectively, the third boss (12) movably contacts with the second boss (11), the inner wall of the mouth (3) is provided with a fourth boss (13), the insulating positioning block (2) is matched with the mouth (3), the bottom of the insulating positioning block (2) movably contacts with the top of the fourth boss (13), the insulating positioning block (2) is a circular ring, and the material of the insulating positioning block (2) is insulating material, the pin (1) is a hollow structure, the inner wall of the mouth (3) is provided with a first boss (10), one end of the positive lead (4) is fixedly connected to the bottom of the pin (1), the other end of the positive lead (4) is fixedly connected to the top of the expansion block (7), which is a signal line, one end of the negative lead (5) is fixedly connected to the bottom of the mouth (3), the other end of the negative lead (5) is fixedly connected to the side corresponding to the piezoelectric ceramic (6) and the threaded shell (8), which is a ground wire.

2. A novel impact sensor of ultra-high frequency, ultra-miniature, and hidden installation according to claim 1, characterized in that, The expansion block (7) is made of memory metal, and the expansion block (7) is in a cylindrical structure.

3. A novel impact sensor of ultra-high frequency, ultra-miniature, and hidden installation according to claim 1, characterized in that, The piezoelectric ceramic (6) is a slotted circular ring structure with a height less than the expansion block (7).

4. A novel impact sensor of ultra-high frequency, ultra-miniature, and hidden installation according to claim 1, characterized in that, The threaded shell (8) is made of aluminum alloy, and the shell is subjected to strong anodizing treatment.

5. A novel impact sensor of ultra-high frequency, ultra-miniature, and hidden installation according to claim 1, characterized in that, The mouth (3) is a ring structure with different diameters from top to bottom, and the mouth (3) is provided with M3 external thread and M5 external thread respectively.

6. A novel impact sensor of ultra-high frequency, ultra-miniature, and hidden installation according to claim 1, characterized in that, The inner wall of the mouth (3) is provided with fixing glue (14), and the positive lead (4) and the negative lead (5) are fixedly connected to the inner wall of the mouth (3) through the fixing glue (14).

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