CN206919829U - Magnetic induction thickness detection apparatus - Google Patents

Abstract

The utility model provides a magnetic induction thickness detection device, which comprises: a magnet with a groove on one side; a measuring frame set on the side of the magnet with the groove and connected by a fixed block; a magnetic sensor chip installed on the measuring The frame faces the side of the magnet and is directly opposite to the groove; and the moving component is used to drive the magnetic induction thickness detection device to move in parallel with respect to the measurement material; the magnetization direction of the magnet is that the magnet points to the direction of the magnetic sensor chip, The space between the magnet and the measuring frame forms a background magnetic field; the measuring frame is provided with an accommodating groove for accommodating the magnetic sensor chip. The embodiment of the utility model not only has the advantages of high precision, high sensitivity and small size, but also has the advantages of easy assembly, convenient use, high yield and anti-vibration interference; in addition, through the function of the moving component, the magnet can be driven smoothly and the measuring frame move along the surface of the measuring material.

Description

Magnetic induction thickness detection device

technical field

The utility model relates to the technical field of thickness sensors, in particular to a magnetic induction thickness detection device.

Background technique

In industrial production and daily life, it is usually necessary to measure the surface roughness and thickness of workpieces and objects. The existing thickness measurement methods include ultrasonic pulse reflection, optical interference, and laser displacement thickness measurement. Different measurement methods correspond to different technologies. Features and scope of application. Ultrasonic pulse reflection and laser displacement methods have low precision, while optical interferometry is only suitable for transparent films, and its volume is large and has high environmental requirements, so it is not convenient to apply. It is not difficult to see that the existing thickness measurement methods cannot meet the requirements of high precision and convenient use in industrial production.

Utility model content

The utility model provides a magnetic induction thickness detection device for solving the technical problems of low measuring precision and inconvenient use of the existing thickness sensor.

The utility model provides a magnetic induction thickness detection device, comprising:

The magnet has a groove on one side;

The measuring frame is arranged on one side of the magnet provided with a groove and connected by a fixed block;

The magnetic sensor chip is installed on the side of the measuring frame facing the magnet and facing the groove; and

a moving component, used to drive the magnetic induction thickness detection device to move in parallel relative to the measurement material;

The magnetization direction of the magnet is that the magnet points to the direction of the magnetic sensor chip, and the space between the magnet and the measuring frame forms a background magnetic field;

The measurement frame is provided with an accommodating groove for accommodating the magnetic sensor chip.

Further, guide grooves are provided on the left and right sides of the measuring frame facing the magnet, and the end of the fixed block connected to the measuring frame is provided with a sliding block matching the guide grooves.

Further, the moving assembly includes two linear guide rails arranged in parallel, a fixed frame movably connected to the linear guide rails for fixing the magnet, and a driving member for driving the fixed frame to move along the linear guide rails.

Further, the magnetic induction thickness detection device further includes a contact piece arranged at the end of the measurement frame in contact with the measurement material.

Further, the contact piece is in the shape of a needle, a ball or a pulley.

Further, the end of the measurement frame in contact with the measurement material is in the shape of a needle, a sphere or a pulley.

Further, the sensitive element of the magnetic sensor chip is an anisotropic magnetoresistance element, a giant magnetoresistance element or a magnetic tunnel junction element.

Further, the cross-sectional shape of the groove is curved, triangular, rectangular or trapezoidal.

Further, the driving part adopts a motor or a cylinder.

The beneficial effects of the utility model are: the utility model moves the measuring frame on the surface of the measuring material. Due to the unevenness of the surface of the measuring material, the magnetic sensor chip is driven to move up and down, so that the background magnetic field is along the sensitive axis of the magnetic sensor chip. The size also changes accordingly. The magnetic sensor chip outputs an electrical signal by measuring the changing field strength. We can use the calibration table to analyze the waveform of the output signal to obtain the surface roughness of the object to be measured; at the same time, by moving the measuring frame up and down, thereby Drive the displacement of the magnetic sensor chip, and calculate the thickness of the measurement material according to the change of the magnetic flux passing through the magnetic sensor chip; in addition, through the action of the moving component, the magnet and the measurement frame can be driven smoothly along the surface of the measurement material; the utility model embodiment While having the advantages of high precision, high sensitivity and small size, it also has the advantages of easy assembly, convenient use, high yield and anti-vibration interference; on the other hand, the magnetic sensor chip is installed in the accommodating groove of the measuring frame , can effectively protect the magnetic sensor chip from wear and tear, and effectively prolong the service life of the device.

Description of drawings

Fig. 1 is a front view of an embodiment of the magnetic induction thickness detection device of the present invention.

Fig. 2 is a top view of an embodiment of the magnetic induction thickness detection device of the present invention.

FIG. 3 is a perspective view of a measurement frame of an embodiment of the magnetic induction thickness detection device of the present invention after accommodating a magnetic sensor chip.

detailed description

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", Orientation indicated by "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. The positional relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation , so it cannot be interpreted as a limitation of the present utility model.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present utility model, "plurality" means two or more, unless otherwise specifically defined.

In this utility model, unless otherwise specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.

In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "below" a second feature may include direct contact between the first and second features, and may also include the first and second features being in direct contact with each other. The features are not in direct contact but through another feature between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

The utility model will be described in further detail below through specific embodiments in conjunction with the accompanying drawings.

As shown in Figures 1 to 3, the utility model provides a magnetic induction thickness detection device, including:

The magnet 1 is provided with a groove 12 on one side;

The measuring frame 2 is arranged on the side of the magnet 1 provided with the groove 12 and is connected by a fixed block 11;

The magnetic sensor chip 3 is installed on the side of the measuring frame 2 facing the magnet 1 and facing the groove 12; and

The moving component 4 is used to drive the magnetic induction thickness detection device to move in parallel relative to the measurement material 10;

The magnetization direction of the magnet 1 is that the magnet 1 points to the direction of the magnetic sensor chip 3, and the space between the magnet 1 and the measuring frame 2 forms a background magnetic field 5;

The measurement frame is provided with an accommodating groove for accommodating the magnetic sensor chip.

The utility model moves on the surface of the measuring material 10 through the measuring frame 1. Due to the unevenness of the surface of the measuring material 10, the magnetic sensor chip 3 is driven to move up and down, so that the component size of the background magnetic field 5 along the sensitive axis direction of the magnetic sensor chip 3 is also the same. As it changes, the magnetic sensor chip 3 outputs an electrical signal by measuring the changing field strength, and we can use the calibration table to analyze the waveform of the output signal to obtain the surface roughness of the object to be measured; at the same time, by moving the measuring frame 2 up and down, thereby Drive the displacement of the magnetic sensor chip 3, and calculate the thickness of the measurement material 10 according to the change of the magnetic flux passing through the magnetic sensor chip 3; in addition, through the action of the moving component 4, the magnet 1 and the measurement frame 2 can be driven smoothly along the surface of the measurement material 10 Mobile; while the embodiment of the utility model has the advantages of high precision, high sensitivity and small size, it has the advantages of easy assembly, convenient use, high yield and anti-vibration interference; on the other hand, the magnetic sensor chip is installed on the In the accommodating groove of the measuring frame, the magnetic sensor chip can be effectively protected from wear and tear, and the service life of the device can be effectively extended.

In an optional embodiment, the measuring frame 2 facing the magnet 1 is provided with guide grooves 21 adjacent to the left and right sides, and the end of the fixed block 11 connected to the measuring frame 2 is provided with the guide groove 21 for matching use. slider 111.

In this embodiment, through the cooperative use of the guide groove 21 and the sliding block 111, the measuring frame 2 can effectively make the measuring frame 2 move vertically when the measuring material 10 is in contact with different positions while maintaining a fixed distance from the magnet 1. Facilitate the measurement of the device.

In an optional embodiment, the moving assembly 4 includes two linear guide rails 41 arranged in parallel, a fixed frame 42 that is movably connected to the linear guide rails 41 and used to fix the magnet 1 , and is used to drive the fixed frame 42 along the linear guide rails 41. Moving drive member 43 .

In this embodiment, through the functions of the linear guide rail 41 and the fixing frame 42, the stability of the magnet 1 and the measuring frame 2 can be maintained, and measurement errors can be reduced.

In an optional embodiment, the magnetic induction thickness detection device further includes a contact piece 22 arranged at the end of the measurement frame 2 that is in contact with the measurement material 10 . Specifically, the contact member 22 is in the shape of a needle, a ball or a pulley.

In this embodiment, contacting the measuring material 10 through the contact member 22 is beneficial to reduce the wear of the measuring frame 2 .

In an optional embodiment, the end of the measurement frame 2 in contact with the measurement material 10 is in the shape of a needle, a sphere or a pulley. It is convenient for the measuring frame 2 to be in contact with the measuring material 10 .

In an optional embodiment, the sensitive element of the magnetic sensor chip 3 is an anisotropic magnetoresistance element, a giant magnetoresistance element or a magnetic tunnel junction element.

In this embodiment, the magnetic sensor chip 3 is a single resistance, half-bridge or full-bridge structure composed of magnetic sensing elements, and the magnetic sensing elements are Hall elements, anisotropic magnetoresistance elements, giant magnetoresistance elements and/or magnetic tunnel junction elements. The magnetic sensing element can be a giant magnetoresistance element and/or a magnetic tunnel junction element with a large saturation field and high precision. The giant magnetoresistance element and the magnetic tunnel junction element are a magnetoresistance element whose resistance value changes with the external magnetic field. Through the existing technology, the R-H (resistance value-external magnetic field) curve of the magnetoresistance element has low hysteresis and high saturation. Field and wide linear range characteristics, higher accuracy and better temperature characteristics than traditional magnetic sensing elements such as inductance coils and Hall elements, higher saturation field compared to anisotropic magnetoresistive elements , which is ideal as a sensitive element of a magnetic thickness sensor.

In addition, the magnetic sensor chip 3 can also be a single resistor, half-bridge or full-bridge structure. The bridge arms of the single resistance, half bridge or full bridge are composed of one or more identical magnetic sensing elements connected in series and/or in parallel, each bridge arm can be equivalent to a magnetoresistance, and the The magnetic field sensitivity directions of the magnetic sensing elements are all the same. The aforementioned single-resistor structure contains a magnetoresistance, the half-bridge structure consists of two magnetoresistances with the same physical properties connected in series, and the full-bridge structure consists of four magnetoresistors with the same physical properties.

In an optional embodiment, the cross-sectional shape of the groove 12 is curved, triangular, rectangular or trapezoidal.

In an optional embodiment, the driving member 43 is a motor or a cylinder.

The magnetic thickness sensor proposed by the utility model can also be multi-channel, and a plurality of magnetic sensor chips 3 are arranged in a row or form an array to measure the measurement material 10, and the output signal is transmitted to the back end, and each magnetic sensor chip 3 corresponds to one A magnet 1 with a groove 12 on its side.

In the description of this specification, references to the terms "one embodiment," "some embodiments," "an embodiment," "some embodiments," "in an optional embodiment," "in particular," "example ", "specific examples", or "some examples" and other descriptions mean that the specific features, structures, materials or characteristics described in conjunction with this embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above content is a further detailed description of the utility model in conjunction with specific implementation methods, and it cannot be determined that the specific implementation of the utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the utility model belongs, some simple deduction or replacement can also be made without departing from the concept of the utility model.

Claims (9)

1. A kind of 1. magnetic induction thickness detection apparatus, it is characterised in that including：

   Magnet, one side are provided with groove；

   Measurement bay, it is arranged at magnet and sets reeded side and connected by fixed block；

   Magnetic sensor chips, be installed in measurement bay towards the side of magnet and with the groove face；And

   Moving assembly, for driving the magnetic induction thickness detection apparatus relative to measurement material parallel movement；

   The magnetizing direction of the magnet is that magnet points to magnetic sensor chips direction, the space between the magnet and measurement bay Form background magnetic field；

   The measurement bay is provided with the storage tank for being used for housing the magnetic sensor chips.
2. 2. magnetic induction thickness detection apparatus as claimed in claim 1, it is characterised in that the measurement bay is towards magnet one side phase Adjacent left and right sides are provided with guide groove, and one end that the fixed block is connected with measurement bay is provided with matches the slip used with the guide groove Block.
3. 3. magnetic induction thickness detection apparatus as claimed in claim 1, it is characterised in that：The moving assembly is parallel including two The line slideway of setting, it is movably connected on line slideway and for fixing the fixed mount of magnet and for driving fixed mount along straight line The actuator of guide rail movement.
4. 4. magnetic induction thickness detection apparatus as claimed in claim 1, it is characterised in that：The magnetic induction thickness detection apparatus is also Including the contact for being arranged at measurement bay with measuring material one end.
5. 5. magnetic induction thickness detection apparatus as claimed in claim 4, it is characterised in that the contact in aciculiform, spheroid or Pulley shape.
6. 6. magnetic induction thickness detection apparatus as claimed in claim 1, it is characterised in that the measurement bay and measurement material One end is in aciculiform, spheroid or pulley shape.
7. 7. magnetic induction thickness detection apparatus as claimed in claim 1, it is characterised in that the sensitivity of the magnetic sensor chips Element is anisotropic magnetoresistance element, giant magnetoresistance element or magnetic tunnel junction element.
8. 8. magnetic induction thickness detection apparatus as claimed in claim 1, it is characterised in that the groove cross section is shaped as curve Shape, triangle, rectangle or trapezoidal.
9. 9. magnetic induction thickness detection apparatus as claimed in claim 3, it is characterised in that the actuator uses motor or gas Cylinder.