CN212320623U

CN212320623U - Miniature magnetostrictive sensor

Info

Publication number: CN212320623U
Application number: CN202021508113.XU
Authority: CN
Inventors: 林炳柱; 张华享; 李和深; 李华洲
Original assignee: Jiangmen Runyu Sensor Technology Co ltd
Current assignee: Guangdong Runyu Sensor Co ltd
Priority date: 2020-07-28
Filing date: 2020-07-28
Publication date: 2021-01-08
Anticipated expiration: 2030-07-28

Abstract

The utility model provides a miniature magnetostrictive sensor, this miniature magnetostrictive sensor includes: the energy picking mechanism, the connecting shell, the detection rod, the induction magnetic ring, the waveguide wire, the fixed inner tube, the circuit board, the plug and the control mechanism. The energy picking mechanism is accommodated in the connecting shell and connected with the connecting shell, the detection rod is connected with the connecting shell, the induction magnetic ring is matched with the detection rod, and the induction magnetic ring is sleeved on the detection rod and is in sliding connection with the detection rod. The waveguide wire is electrically connected with the energy picking mechanism, the fixed inner tube is connected with the connecting shell, and the waveguide wire is contained in the fixed inner tube and is connected with the fixed inner tube. The fixed inner tube is accommodated in the detection rod and is connected with the detection rod. The energy picking mechanism is electrically connected with the circuit board, the waveguide wire is electrically connected with the circuit board, the circuit board is electrically connected with the plug, and the circuit board is electrically connected with the control mechanism. Due to the delicate connection of all the parts, the size of the micro magnetostrictive transducer is greatly reduced, the micro magnetostrictive transducer is convenient to carry and use, the use range is expanded, and the measurement requirement under a complex environment can be met.

Description

Miniature magnetostrictive sensor

Technical Field

The utility model relates to a product protection field especially relates to a miniature magnetostrictive transducer.

Background

The magnetostrictive transducer is a non-contact absolute value displacement detection device, and the basic principle is that the displacement measurement between the position where the pulse mechanical wave is generated and a magnetostrictive detection module (energy picking mechanism) is realized by measuring the propagation time of the pulse mechanical wave in a magnetostrictive wave guide wire and combining the propagation speed. The magnetostrictive transducer is widely applied to the fields of walking machinery, material forming, metallurgical machinery and the like, but the application of the magnetostrictive measurement principle is often restricted by the size of the transducer output part of the magnetostrictive transducer on mechanical equipment with a narrow installation space, the structure of the transducer output part of the magnetostrictive transducer is directly connected with the structure of an energy picking mechanism, and the energy picking mechanism is a core component of the magnetostrictive principle.

However, the size of the conventional magnetostrictive sensor is large, and on the one hand, the large-sized magnetostrictive sensor is inconvenient to carry and use. On the other hand, the larger size affects the application range of the magnetostrictive sensor, and cannot meet the measurement requirement on displacement in a complex environment.

SUMMERY OF THE UTILITY MODEL

In view of this, it is necessary to provide a micro magnetostrictive sensor in order to solve the technical problem that the large size affects the range of adaptation of the magnetostrictive sensor.

A micro magnetostrictive sensor, comprising: the energy collecting mechanism, the connecting shell, the detection rod, the induction magnetic ring, the waveguide wire, the fixed inner tube, the circuit board, the plug and the control mechanism;

the energy picking mechanism is accommodated in the connecting shell and connected with the connecting shell, the detection rod is connected with the connecting shell, the induction magnetic ring is matched with the detection rod, and the induction magnetic ring is sleeved on the detection rod and is in sliding connection with the detection rod; the waveguide wire is electrically connected with the energy picking mechanism, the fixed inner tube is connected with the connecting shell, and the waveguide wire is accommodated in the fixed inner tube and is connected with the fixed inner tube; the fixed inner tube is accommodated in the detection rod and is connected with the detection rod; the energy picking mechanism is electrically connected with the circuit board, the waveguide wire is electrically connected with the circuit board, the circuit board is electrically connected with the plug, and the circuit board is electrically connected with the control mechanism.

In one embodiment, one end of the waveguide wire far away from the energy picking mechanism is connected with the fixed inner tube through a rivet.

In one embodiment, the waveguide wire is further sleeved with a fastening sleeve, the fastening sleeve is sleeved on part of the waveguide wire, and the waveguide wire passes through the fastening sleeve and the fixed inner tube.

In one embodiment, the fastening sleeve is a copper sleeve.

In one embodiment, the fastening sleeve is an iron sleeve.

In one embodiment, the fastening sleeve is an aluminum sleeve.

In one embodiment, the control mechanism is a single chip microcomputer.

In one embodiment, the connection housing is a shield housing.

In one embodiment, the plug and the circuit board are electrically connected by a flexible circuit.

When the annular magnetic field is crossed with the magnetic field generated by a detection magnetic ring sleeved on the waveguide wire, a strain mechanical wave pulse signal is generated in the waveguide wire under the action of magnetostriction, the strain mechanical wave pulse signal is transmitted to the energy pickup mechanism at a fixed speed along the waveguide wire, the energy pickup mechanism converts the strain mechanical wave pulse signal into a tiny electric signal after sensing the strain mechanical wave pulse signal on the waveguide wire, the tiny electric signal is amplified by the circuit board and then transmitted to the control mechanism, and the control mechanism combines the time for transmitting the current pulse, the time for receiving the amplified electric signal, the transmission speed of the strain mechanical wave pulse signal and other information, and calculating to obtain the actual displacement value of the induction magnetic ring on the detection rod. Due to the delicate connection of all parts, the micro magnetostrictive sensor has the advantages of greatly reduced size, convenience in carrying and use, expanded use range and capability of meeting the measurement requirements in complex environments.

Drawings

FIG. 1 is a schematic diagram of a micro magnetostrictive sensor according to an embodiment;

FIG. 2 is a cross-sectional view of a micro magnetostrictive sensor according to an embodiment;

fig. 3 is a schematic diagram of a partially enlarged structure of the micro magnetostrictive sensor in the embodiment of fig. 2.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1 to 3 together, the present invention provides a micro magnetostrictive sensor 10, where the micro magnetostrictive sensor 10 includes: the energy picking mechanism 100, the connecting shell 200, the detecting rod 300, the induction magnetic ring 400, the waveguide wire 500, the fixed inner tube 600, the circuit board 700, the plug 800 and the control mechanism (not shown). The energy pick-up mechanism 100 is accommodated in the connecting shell 200 and connected to the connecting shell 200, in one embodiment, the connecting shell 200 is a shielding shell to shield electromagnetic interference from the outside, and further, the connecting shell 200 is a copper shell. In other embodiments, the connection shell is an iron shell, and in another embodiment, the connection shell is an aluminum shell. The detection rod 300 is connected with the connection shell 200, the induction magnetic ring 400 is matched with the detection rod 300, and the induction magnetic ring 400 is sleeved on the detection rod 300 and is connected with the detection rod 300 in a sliding mode. In this embodiment, an end cap 310 is disposed at an end of the detection rod 300 away from the connection housing 200, that is, the end cap 310 serves to limit the induction magnetic ring 400, so as to prevent the induction magnetic ring 400 from sliding off the detection rod 300. The waveguide wire 500 is electrically connected with the energy-picking mechanism 100, the fixed inner tube 600 is connected with the connecting shell 200, the waveguide wire 500 is accommodated in the fixed inner tube 600 and connected with the fixed inner tube 600, in the embodiment, one end of the waveguide wire 500 far away from the energy-picking mechanism 100 is connected with the fixed inner tube 600 through a rivet 510, so that the connection stability of the waveguide wire 500 and the fixed inner tube 600 is improved. The fixed inner tube 600 is received in the sensing rod 300 and connected to the sensing rod 300. The energy pick-up mechanism 100 is electrically connected with the circuit board 700, the waveguide wire 500 is electrically connected with the circuit board 700, the circuit board 700 is electrically connected with the plug 800, and in the present embodiment, the plug 800 and the circuit board 700 are electrically connected through the flexible circuit 810. The circuit board 700 is electrically connected to a control mechanism. In this embodiment, the control mechanism is a single chip microcomputer.

Referring to fig. 2, in order to improve the working stability of the micro magnetostrictive sensor 10, in one embodiment, a fastening sleeve 520 is further sleeved on the waveguide wire 500, the fastening sleeve 520 is sleeved on a portion of the waveguide wire 500, and the waveguide wire 500 passes through the fastening sleeve 520 and the fixed inner tube 600, so as to further increase the connection stability between the waveguide wire 500 and the fixed inner tube 600. Further, in the present embodiment, the fastening sleeve 520 is a copper sleeve to prevent the waveguide wire 500 from being interfered by external electromagnetic waves, thereby increasing the working stability of the waveguide wire 500. In other embodiments, the clamping sleeve is an iron sleeve. In another embodiment, the fastening sleeve is an aluminum sleeve. In this embodiment, the waveguide wire 500 is provided with a buffering rubber strip 530 between the rivet 510 and the fastening sleeve 520 to absorb the strain mechanical wave pulse signal propagating toward the rivet 510 from the waveguide wire, so as to avoid the strain mechanical wave pulse signal propagating toward the rivet 510 from affecting the measurement result, in this embodiment, the buffering rubber strip 530 is a rubber strip. Thus, the operation stability of the micro magnetostrictive sensor 10 is improved.

In the working process of the micro magnetostrictive transducer 10, the control mechanism sends periodic current pulses to the waveguide wire 500 through the circuit board 700, the current pulses are propagated inside the waveguide wire 500, an annular magnetic field is generated outside the waveguide wire 500, when the annular magnetic field intersects with a magnetic field generated by a detection magnetic ring sleeved on the waveguide wire 500, a strain mechanical wave pulse signal is generated inside the waveguide wire 500 due to the magnetostrictive action, the strain mechanical wave pulse signal is propagated to the energy pickup mechanism 100 at a fixed speed along the waveguide wire 500, after the energy pickup mechanism 100 senses the strain mechanical wave pulse signal on the waveguide wire 500, the strain mechanical wave pulse signal is converted into a tiny electric signal, the tiny electric signal is amplified by the circuit board 700 and then transmitted to the control mechanism, and the control mechanism combines information such as the time for sending the current pulses, the time for receiving the amplified electric signal, and the propagation speed of the strain mechanical wave pulse signal, and calculating to obtain the actual displacement value of the induction magnetic ring 400 on the detection rod 300. Due to the delicate connection of all parts, the micro magnetostrictive sensor 10 has the advantages that the size of the micro magnetostrictive sensor 10 is greatly reduced, the micro magnetostrictive sensor is convenient to carry and use, the use range is expanded, and the measurement requirement under the complex environment can be met.

It should be noted that the energy pick-up mechanism 100 is prior art. There are many configurations on the market, and therefore the specific configuration of the energy pick-up mechanism 100 is not limited herein, and it should be understood that all mechanisms capable of sensing a strain mechanical wave pulse signal are the energy pick-up mechanism 100. In this embodiment, the energy pick-up mechanism includes a support, an energy pick-up coil, a magnet, and a neutral lead. The energy picking coil and the magnet are both connected with the bracket, the energy picking coil is arranged around the magnet, the energy picking coil is electrically connected with the waveguide wire 500 through a central lead, and on the other hand, the energy picking coil is electrically connected with the circuit board 700 through a central lead. That is, the portion of the strained mechanical wave pulse signal propagating into the waveguide wire changes the permeability of the waveguide wire, thereby causing a change in the transmission of magnetic flux in the energy pick-up coil, resulting in a corresponding electrical signal.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A miniature magnetostrictive sensor, comprising: the energy collecting mechanism, the connecting shell, the detection rod, the induction magnetic ring, the waveguide wire, the fixed inner tube, the circuit board, the plug and the control mechanism;

2. The miniature magnetostrictive sensor according to claim 1, wherein the end of the waveguide wire remote from the energy pick-up mechanism is connected to the fixed inner tube by a rivet.

3. The miniature magnetostrictive sensor according to claim 1, wherein the waveguide wire is further sleeved with a fastening sleeve, the fastening sleeve is sleeved on a part of the waveguide wire, and the waveguide wire passes through the fastening sleeve and the fixed inner tube.

4. The micro magnetostrictive sensor according to claim 3, wherein the fastening sleeve is a copper sleeve.

5. The miniature magnetostrictive sensor according to claim 3, wherein the clamping sleeve is an iron sleeve.

6. The miniature magnetostrictive sensor according to claim 3, wherein the fastening sleeve is an aluminum sleeve.

7. The micro magnetostrictive sensor according to claim 1, wherein the control mechanism is a single-chip microcomputer.

8. The miniature magnetostrictive sensor according to claim 1, wherein the connecting shell is a shielding shell.

9. The miniature magnetostrictive sensor according to claim 1, wherein the plug and the circuit board are electrically connected by a flexible wire.