CN218496032U - Displacement meter - Google Patents
Displacement meter Download PDFInfo
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- CN218496032U CN218496032U CN202222536454.3U CN202222536454U CN218496032U CN 218496032 U CN218496032 U CN 218496032U CN 202222536454 U CN202222536454 U CN 202222536454U CN 218496032 U CN218496032 U CN 218496032U
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- elastic sheet
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Abstract
The utility model discloses a displacement meter relates to measuring instrument technical field, and the main objective improves gap width change measuring precision. The utility model discloses a main technical scheme does: a displacement meter, comprising: the device comprises a shell, a sensitization part and a microwave detection mechanism; the sensitization part comprises an elastic sheet, a diaphragm and a probe rod, the edge of the diaphragm is fixedly connected to the inner side face of the middle of the shell, one end of the elastic sheet is fixedly connected to one end of the shell, the other end of the elastic sheet is fixedly connected to the center of the diaphragm, one end of the probe rod is connected to the center of the diaphragm, and the other end of the probe rod extends out of the shell; the microwave detection mechanism is arranged on the side wall of one end of the shell and is used for corresponding to the central area of the elastic sheet.
Description
Technical Field
The utility model relates to a measuring instrument technical field especially relates to a displacement meter.
Background
The displacement meter is used for measuring the relative movement amount of two positions of a structure or the opening and closing amount of a crack. The displacement meter is installed at a target position, for example, a gap of a hydraulic structure or a concrete structure, and is used for measuring a width change of the gap, and generally converts the displacement of the target position into an electrical signal, so as to transmit the signal for a long distance. The displacement meter and the vector network analyzer are connected through an electric connection to transmit signals, and are connected through a common coaxial cable. The vector network analyzer can obtain the displacement of the target position by analyzing the transmitted electric signal. At present, the most commonly used displacement meters are a vibrating wire displacement meter and an LVDT displacement meter, and the problems of low measurement precision and zero drift generally exist.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a displacement meter, the main objective improves the gap width change measuring precision.
In order to achieve the above object, the present invention mainly provides the following technical solutions:
the utility model provides a displacement meter, it includes: the device comprises a shell, a sensitization part and a microwave detection mechanism;
the sensitization part comprises an elastic sheet, a diaphragm and a probe rod, the edge of the diaphragm is fixedly connected to the inner side surface of the middle part of the shell, one end of the elastic sheet is fixedly connected to one end of the shell, the other end of the elastic sheet is fixedly connected to the center of the diaphragm, one end of the probe rod is connected to the center of the diaphragm, and the other end of the probe rod extends out of the shell;
the microwave detection mechanism is arranged on the side wall of one end of the shell and is used for corresponding to the central area of the elastic sheet.
The purpose of the utility model and the technical problem thereof can be further realized by adopting the following technical measures.
Optionally, the microwave detection mechanism further comprises a first clamp and a second clamp, the first clamp is fixedly connected to one end of the housing, the second clamp is fixedly connected to the center of the diaphragm, and two ends of the elastic piece are respectively clamped by the first clamp and the second clamp and used for limiting a rotation angle of the elastic piece relative to the microwave detection mechanism.
Optionally, the device further comprises a spring, one end of the spring is connected to the second clamp, and the other end of the spring is connected to one end of the probe rod.
Optionally, the detection device further comprises a bearing seat and a piston plate, the bearing seat is coaxially installed at the other end of the shell, the probe rod is installed on the bearing seat through a linear bearing, one end of the probe rod is fixedly connected to the piston plate, the piston plate is slidably connected to the inner side wall of the other end of the shell, and the other end of the spring is fixedly connected to the center of the piston plate.
Optionally, a mounting hole is formed in a side wall of one end of the casing, the microwave detection mechanism includes a metal shell, a metal rod and a reflection component, one end of the metal shell is fixedly penetrated through the mounting hole, the metal rod is coaxially mounted in the metal shell and used for enabling one end of the metal rod to correspond to the central area of the elastic sheet, the reflection component is mounted in the metal shell, and the other end of the metal rod is electrically connected to the vector network analyzer.
Optionally, the first clamp is clamped at the inner side of one end of the shell.
Borrow by above-mentioned technical scheme, the utility model discloses at least, have following advantage:
when the constructor uses the displacement meter, one end of the shell is fixed on one side of the gap of the structure, and the other end of the probe contacts the other side of the gap.
Along with the lapse of time, if the structure gap is when slightly reducing, promote the probe and remove in to the casing, the probe contradicts the center of diaphragm, thereby axial compression shell fragment, the shell fragment center can produce normal direction displacement in the normal direction, the normal direction displacement of shell fragment generally is more than 5 times of shell fragment axial compression displacement, the central zone of shell fragment is as the plane of reflection that microwave detection mechanism detected, because the shell fragment takes place normal direction displacement, plane of reflection and microwave detection mechanism's interval crescent, and the normal direction displacement of shell fragment is comparatively obvious for the axial compression displacement of shell fragment, so make this displacement meter can detect out the less displacement change of structure gap width, the precision of gap width change measurement has been improved.
Drawings
Fig. 1 is a schematic structural diagram of a displacement meter according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the operation of the microwave detection mechanism;
FIG. 3 is a schematic diagram of deformation of the spring plate;
FIG. 4 is a microwave spectrum diagram of a microwave detection mechanism;
fig. 5 is an enlarged scale diagram of the deflection of the spring plate.
Reference numerals in the drawings of the specification include: the device comprises a shell 1, an elastic sheet 2, a diaphragm 3, a probe rod 4, a first clamp 5, a second clamp 6, a spring 7, a bearing seat 8, a piston plate 9, a metal shell 10, a metal rod 11, a reflecting component 12, a vector network analyzer 13 and a clamping piece 14.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the intended purpose of the present invention, the following detailed description is given with reference to the accompanying drawings and preferred embodiments, in order to explain the detailed embodiments, structures, features and effects of the present invention. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, 3 and 5, an embodiment of the present invention provides a displacement meter, which includes: the device comprises a shell 1, a sensitization part and a microwave detection mechanism;
the sensitization part comprises an elastic sheet 2, a membrane 3 and a probe rod 4, the edge of the membrane 3 is fixedly connected with the inner side surface of the middle part of the shell 1, one end of the elastic sheet 2 is fixedly connected with one end of the shell 1, the other end of the elastic sheet is fixedly connected with the center of the membrane 3, one end of the probe rod 4 is connected with the center of the membrane 3, and the other end of the probe rod extends out of the shell 1;
the microwave detection mechanism is arranged on the side wall of one end of the shell 1 and is used for corresponding to the central area of the elastic sheet 2.
The working process of the displacement meter is as follows:
when using the displacement meter, the constructor fixes one end of the housing 1 to one side of the gap of the structure, and the other end of the probe contacts the other side of the gap.
Along with the lapse of time, if the structure gap is when slightly shrinking, promote the probe and remove in to casing 1, the probe contradicts the center of diaphragm 3, thereby axial compression shell fragment 2, shell fragment 2 center can produce normal displacement in the normal direction, shell fragment 2's normal displacement generally is more than 5 times of shell fragment 2 axial compression displacement, the central zone of shell fragment 2 is as the plane of reflection that microwave detection mechanism detected, because shell fragment 2 takes place normal displacement, plane of reflection and microwave detection mechanism's interval crescent, and shell fragment 2's normal displacement is comparatively obvious for shell fragment 2's axial compression displacement, so make this displacement meter can detect out the less displacement change of structure gap width, the precision of gap width change measurement has been improved.
The technical scheme of the utility model in, through the deformation characteristic of shell fragment 2, improve the minimum that the gap width that the displacement meter can detect changes to the precision that the gap width changes and detects has been improved.
As shown in fig. 1, in a specific embodiment, the microwave detection device further includes a first clamp 5 and a second clamp 6, the first clamp 5 is fixedly connected to one end of the housing 1, the second clamp 6 is fixedly connected to the center of the diaphragm 3, and two ends of the elastic piece 2 are respectively clamped by the first clamp 5 and the second clamp 6, so as to limit a rotation angle of the elastic piece 2 relative to the microwave detection mechanism.
In this embodiment, specifically, two ends of the elastic sheet 2 are respectively clamped by the first clamp 5 and the second clamp 6, so that the elastic sheet 2 is prevented from being turned over, the detection end of the microwave detection mechanism can be perpendicular to the reflection surface of the central area of the elastic sheet 2 all the time, the reflection surface can vertically reflect the microwaves emitted by the microwave detection mechanism, and smooth microwave detection is ensured.
Specifically, the thickness of the elastic sheet 2 is generally not more than 0.5mm. As shown in fig. 1 and 3, after the elastic sheet 2 is axially compressed for positioning and moving, instability can occur; in actual use, the elastic sheet 2 is always in a destabilized state; because both ends of the elastic sheet 2 are fixedly restrained by the first clamp 5 and the second clamp 6, the corners of both ends of the elastic sheet 2 are limited, and both ends of the elastic sheet 2 do not rotate. When the second clamp 6 axially compresses the spring plate 2, the central region of the spring plate 2 generates a relatively large normal displacement in the normal direction, and as shown in fig. 1 and 3, the central point of the spring plate 2 moves downward. The axial compression amount of the elastic sheet 2 is delta L, and the center point of the elastic sheet 2 has a normal displacement delta d which is far larger than the axial compression amount; as can be seen from FIG. 5, in general,. DELTA.d.gtoreq.5. DELTA.L. As shown in fig. 4, the surface of the central area of the elastic sheet 2 facing the microwave detection mechanism is a reflecting surface; at this time, the reflection surface and the microwave detection mechanism undergo a large relative movement Δ d, so that the frequency f corresponding to the peak value is greatly changed.
As shown in fig. 1, in the specific embodiment, a spring 7 is further included, one end of the spring 7 is connected to the second clamp 6, and the other end is connected to one end of the probe 4.
In this embodiment, specifically, when the probe rod 4 is extruded by the gap, the spring 7 can buffer the impact force of the probe rod 4 on the diaphragm 3, so as to prevent the diaphragm 3 from being damaged, thereby improving the fatigue resistance of the displacement meter.
As shown in fig. 1, in a specific embodiment, the sensor further includes a bearing seat 8 and a piston plate 9, the bearing seat 8 is coaxially installed at the other end of the housing 1, the probe rod 4 is installed at the bearing seat 8 through a linear bearing, one end of the probe rod 4 is fixedly connected to the piston plate 9, the piston plate 9 is slidably connected to an inner side wall of the other end of the housing 1, and the other end of the spring 7 is fixedly connected to a center of the piston plate 9.
In this embodiment, specifically, the linear bearing is a metal linear bearing, and point contact and rolling friction are formed between the probe rod 4 and the steel balls in the linear bearing, so that the probe rod 4 can obtain high-precision stable motion, one end of the probe rod 4 is fixedly connected to the center of the piston plate 9, and the piston plate 9 is slidably connected to the inner side wall of the housing 1, so that the probe rod 4 can further move linearly and stably.
As shown in fig. 1, in a specific embodiment, a mounting hole is formed in a side wall of one end of the housing 1, the microwave detection mechanism includes a metal shell 10, a metal rod 11 and a reflection member 12, one end of the metal shell 10 is fixedly penetrated through the mounting hole, the metal rod 11 is coaxially mounted in the metal shell 10, so that one end of the metal rod 11 corresponds to a central area of the elastic piece 2, the reflection member 12 is mounted in the metal shell 10, and the other end of the metal rod 11 is electrically connected to a vector network analyzer 13.
As shown in fig. 2, in the present embodiment, specifically, the microwaves traveling in the microwave detection mechanism are mainly reflected by the reflection member 12, and a part of the energy is reflected; the microwave continues to travel to the reflecting surface of the elastic sheet 2, a small part of electromagnetic waves are reflected on the reflecting surface of the elastic sheet 2 again, and the repeated round-trip is carried out for a plurality of times (the round-trip times are determined by the reflectivity of the reflecting component 12 and the emitting surface of the elastic sheet 2), so that the microwave is reflected for a plurality of times in the microwave detection mechanism to form a frequency spectrum. If the distance between the reflecting part 12 and the reflecting surface of the elastic sheet 2 changes, the frequency corresponding to the peak value in the microwave spectrogram changes, the distance between the reflecting part 12 and the reflecting surface of the elastic sheet 2 can be determined through the frequency, and because the reflecting part 12 is fixed in the metal shell 10 and the gap of the structure of the metal shell 10 is fixed, the size of the normal displacement of the central area of the elastic sheet 2 can be determined according to the distance between the reflecting part 12 and the reflecting surface of the elastic sheet 2, and further the axial displacement of the probe rod 4 can be detected.
Specifically, the other end of the metal rod 11 is connected to a radio frequency connector, and the radio frequency connector is connected to the vector network analyzer 13.
Specifically, the microwave detection mechanism utilizes the principle of microwave, and the microwave generally refers to electromagnetic wave with the frequency of 300MHz-3000 GHz.
Specifically, the displacement of the structure gap is converted into the axial compression displacement of the elastic piece 2, and the change in the distance from the reflecting member 12 to the reflecting surface of the elastic piece 2 is measured by the change amount of the frequency corresponding to the peak value, thereby determining the magnitude of the gap displacement. The change of the gap displacement drives the probe rod 4 to move axially, so that the spring 7 is compressed, and the spring 7 presses the central point of the diaphragm 3, so that the deflection of the central point of the diaphragm 3 is changed; meanwhile, the left side surface of the membrane 3 is fixedly connected to the second clamp 6; the deflection change of the central point of the membrane 3 causes the second clamp 6 to move leftwards, so that the elastic sheet 2 is compressed axially, the deflection of the central area of the elastic sheet 2 changes greatly downwards, the distance between the reflecting part 12 and the reflecting surface of the elastic sheet 2 changes greatly, and the frequency corresponding to the peak value also changes; and calibrating the relationship between the displacement and the frequency corresponding to the peak value, and determining the magnitude of the displacement through the frequency corresponding to the peak value in the using process of the displacement meter. It should be noted that, through the above process, the small deflection variation of the central point of the diaphragm 3 is changed into the large variation of the distance between the reflecting part 12 and the reflecting surface of the elastic sheet 2, so that the small deformation of the diaphragm 3 is changed into the large variation of the peak frequency, the fatigue resistance of the diaphragm 3 is greatly increased, the service life of the displacement meter is prolonged, and the long-term null shift is greatly reduced.
After the microwave detection mechanism transmits the microwave signal to the vector network analyzer 13, the vector network analyzer 13 may analyze the frequency spectrum of the microwave signal, and may further analyze the frequency spectrum to obtain the size of the gap displacement of the structure.
As shown in fig. 1, in the embodiment, the first clamp 5 is clamped inside one end of the housing 1.
In this embodiment, specifically, first anchor clamps 5 keep away from one end shaft side annular equipartition of shell fragment 2 and have a plurality of fasteners 14, the inboard equipartition of one end of casing 1 has a plurality of draw-in grooves, and each fastener 14 corresponds the joint in one of them draw-in groove, avoids first anchor clamps 5 to radially rotate for casing 1, and on this basis, first anchor clamps 5 and second anchor clamps 6 centre gripping respectively in the both ends of shell fragment 2, and shell fragment 2 just can not radially rotate for casing 1, just also can not rotate for microwave detection mechanism to guarantee the normal clear of microwave detection.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A displacement meter, comprising:
a housing;
the sensitization part comprises an elastic sheet, a diaphragm and a probe rod, the edge of the diaphragm is fixedly connected to the inner side surface of the middle part of the shell, one end of the elastic sheet is fixedly connected to one end of the shell, the other end of the elastic sheet is fixedly connected to the center of the diaphragm, one end of the probe rod is connected to the center of the diaphragm, and the other end of the probe rod extends out of the shell;
and the microwave detection mechanism is arranged on the side wall of one end of the shell and is used for corresponding to the central area of the elastic sheet.
2. Displacement meter according to claim 1,
the microwave detection device is characterized by further comprising a first clamp and a second clamp, wherein the first clamp is fixedly connected to one end of the shell, the second clamp is fixedly connected to the center of the diaphragm, and two ends of the elastic sheet are respectively clamped in the first clamp and the second clamp and used for limiting the rotation angle of the elastic sheet relative to the microwave detection mechanism.
3. Displacement meter according to claim 2,
the probe rod is characterized by further comprising a spring, wherein one end of the spring is connected to the second clamp, and the other end of the spring is connected to one end of the probe rod.
4. Displacement meter according to claim 3,
the detection device comprises a shell, and is characterized by further comprising a bearing seat and a piston plate, wherein the bearing seat is coaxially installed at the other end of the shell, the detection rod is installed in the bearing seat through a linear bearing, one end of the detection rod is fixedly connected with the piston plate, the piston plate is connected to the inner side wall of the other end of the shell in a sliding mode, and the other end of the spring is fixedly connected to the center of the piston plate.
5. Displacement meter according to any one of claims 1 to 4,
the microwave detection mechanism comprises a shell, a microwave detection mechanism and a reflecting component, wherein a mounting hole is formed in the side wall of one end of the shell, the microwave detection mechanism comprises a metal shell, a metal rod and the reflecting component, one end of the metal shell is fixedly penetrated through the mounting hole, the metal rod is coaxially mounted in the metal shell and used for enabling one end of the metal rod to correspond to the central area of the elastic sheet, the reflecting component is mounted in the metal shell, and the other end of the metal rod is electrically connected to a vector network analyzer.
6. Displacement meter according to claim 2,
the first clamp is clamped at the inner side of one end of the shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222536454.3U CN218496032U (en) | 2022-09-22 | 2022-09-22 | Displacement meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222536454.3U CN218496032U (en) | 2022-09-22 | 2022-09-22 | Displacement meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218496032U true CN218496032U (en) | 2023-02-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222536454.3U Active CN218496032U (en) | 2022-09-22 | 2022-09-22 | Displacement meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218496032U (en) |
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2022
- 2022-09-22 CN CN202222536454.3U patent/CN218496032U/en active Active
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