CN210014748U - Magnetic encoder for steel rail flaw detector - Google Patents
Magnetic encoder for steel rail flaw detector Download PDFInfo
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- CN210014748U CN210014748U CN201920917275.XU CN201920917275U CN210014748U CN 210014748 U CN210014748 U CN 210014748U CN 201920917275 U CN201920917275 U CN 201920917275U CN 210014748 U CN210014748 U CN 210014748U
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- flaw detector
- encoder
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- magnetic encoder
- magnetic field
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Abstract
The utility model discloses a magnetic encoder for rail flaw detector, including the center pin that is used for fixed encoder, be used for producing the ring magnet that magnetic field changes, be used for measuring the magnetic field measuring element that magnetic field changes and be used for driving magnetic field measuring element pivoted base, the ring magnet with the base all sets up on the center pin, magnetic field measuring element includes lag, measuring head and circuit board, the lag sets up the outside of measuring head. The utility model replaces the photoelectric encoder with the magnetic encoder, and because the influence of the external vibration on the change of the magnetic field intensity is very little, the anti-vibration performance of the encoder is effectively improved; and one pulse of once output of traditional photoelectric encoder, this magnetic encoder can once output two sets of pulses, measures same section displacement, can improve the precision of displacement measurement result to a certain extent like this, can satisfy the requirement of measurement work better.
Description
Technical Field
The utility model relates to a displacement measurement technical field, concretely relates to magnetic encoder for rail flaw detector.
Background
The welding seam flaw detector is a true color display full digital ultrasonic flaw detector, and can quickly, conveniently, nondestructively and accurately detect, position, evaluate and diagnose various defects (cracks, inclusions, air holes and the like) in a workpiece. The device is used for both laboratories and engineering field detection. The instrument is widely applied to the fields of special inspection departments, construction engineering quality inspection stations, boiler pressure vessel manufacturing, engineering machinery manufacturing, ferrous metallurgy industry, steel structure manufacturing, ship manufacturing, petroleum and natural gas equipment manufacturing and the like which need defect detection and quality control, and is also widely applied to in-service safety inspection and service life evaluation in the fields of aerospace, railway transportation, boiler pressure vessels and the like.
In the detection of defects of steel rails, it is also often necessary to use a rail weld flaw detector, in which an important part is used for recording displacement information of the flaw detector so as to obtain data such as the propulsion mileage of the flaw detector, the name of the part is called an encoder, the encoder is a rotary sensor for converting rotary displacement into a series of digital pulse signals, and the pulses can be used for controlling angular displacement and can also be used for measuring linear displacement if the encoder is combined with a gear rack or a screw.
In the existing steel rail welding seam flaw detector, a photoelectric encoder is mainly used, certain defects exist when the photoelectric encoder is actually applied to the steel rail welding seam flaw detector, firstly, the vibration resistance of the photoelectric encoder is general, in the process of detecting flaws of a steel rail, the flaw detector continuously moves on the steel rail, so that the vibration cannot be avoided, when the photoelectric encoder generates large vibration, the situations of pulse false sending and the like can occur, adverse effects can be brought to the displacement metering precision of the flaw detector, and therefore, the magnetic encoder for the steel rail flaw detector is provided.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve lies in: how to effectively improve the service performance of an encoder in a steel rail flaw detector and provide a magnetic encoder for the steel rail flaw detector.
The utility model solves the technical problems by the following technical proposal, and comprises a central shaft for fixing the encoder, an annular magnet for generating magnetic field change, a magnetic field measuring element for measuring the magnetic field change and a base for driving the magnetic field measuring element to rotate, wherein the annular magnet and the base are both arranged on the central shaft;
the magnetic field measuring element comprises a protective sleeve, a measuring head and a circuit board, the protective sleeve is arranged on the measuring head, the protective sleeve and the measuring head are both arranged on the circuit board, and the circuit board is connected with the base;
the measuring head comprises two Hall sensors for converting the change of the magnetic field into pulse output, and the two Hall sensors correspondingly output two groups of pulse signals;
the annular magnet comprises a plurality of magnetic steels and a body, and the magnetic steels are uniformly arranged on the body.
Preferably, the magnetic encoder still includes spacing copper sheathing, spacing copper sheathing with base fixed connection is in like this when spacing copper sheathing rotates the base just can then rotate together, thereby drives the measuring head winds the ring magnet rotates.
Preferably, the limiting part is arranged on the limiting copper sleeve and is used for being clamped in a groove body at one end inside the shell.
Preferably, the magnetic encoder further comprises a housing and an end cap, the housing is disposed outside the ring magnet and the base, the end cap passes through the central shaft and is connected with the housing, and the housing is in direct contact with the upper surface of the steel rail.
Preferably, a groove body matched with the limiting copper sleeve and the limiting part is formed in the center of one end of the inner surface of the shell, so that when the steel rail moves relatively, the shell can drive the limiting copper sleeve to rotate through the groove body.
Preferably, the magnetic encoder further comprises a transmission line for transmitting pulse signals, the transmission line is connected with the circuit board, and the transmission line can transmit the two groups of output pulse signals to the signal processing device.
Preferably, the base, the limiting copper sleeve, the shell and the end cover are movably connected with the central shaft, so that the base, the limiting copper sleeve, the shell and the end cover can rotate relatively.
Preferably, the ring magnet is fixedly connected to the central shaft, so that the measuring head can be rotated about the ring magnet to measure the change in the magnetic field during this process.
Preferably, the edge of the end cap is provided with a plurality of prepared holes for connecting the housing, and the end cap and the housing can be fixed together by using self-tapping to penetrate through the prepared holes during assembly.
Preferably, the casing and the end cover are connected together to form a T shape, and the encoder is conveniently clamped at the upper end of the steel rail due to the T-shaped design.
Compared with the prior art, the utility model has the following advantages: firstly, a magnetic encoder replaces a photoelectric encoder, and because the influence of external vibration on the change of the magnetic field intensity is very little, the vibration resistance of the encoder is effectively improved; and traditional photoelectric encoder's once output pulse, this magnetic encoder can export two sets of pulses in succession, measures same section displacement, can improve the precision of displacement measurement result to a certain extent like this, can satisfy the requirement of measurement work better, is worth being used widely.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a schematic view of the internal structure of the present invention;
fig. 3 is a partial view of the housing of the present invention.
In the figure: 1. a central shaft; 11. a housing; 2. a ring magnet; 3. a base; 31. a measuring head; 32. a circuit board; 33. a protective sleeve; 4. a limiting copper sleeve; 41. a limiting member; 5. an end cap; 6. a housing; 61. a tank body.
Detailed Description
The embodiments of the present invention will be described in detail below, and the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1-3, the present embodiment provides a technical solution: a magnetic encoder for a steel rail flaw detector comprises a central shaft 1 for mounting and fixing the encoder, an annular magnet 2 for generating magnetic field change, a magnetic field measuring element for measuring the magnetic field change and a base 3 for driving the magnetic field measuring element to rotate, wherein the annular magnet 2 and the base 3 are arranged on the central shaft 1;
the magnetic field measuring element comprises a protective sleeve 33, a measuring head 31 and a circuit board 32, the protective sleeve 33 is arranged outside the measuring head 31, the protective sleeve 33 and the measuring head 31 are both arranged on the circuit board 32, the circuit board 32 and the base 3 are fixed through connecting bolts, the protective sleeve 33 can effectively protect two Hall sensors in the magnetic field measuring element, and the service life of the magnetic encoder is prolonged to a certain extent;
the annular magnet 2 comprises a plurality of magnetic steels, the magnetic steels are uniformly arranged inside the annular magnet 2, the distance between every two magnetic steels is fixed, and the size of every two magnetic steels is also fixed, so that the displacement can be calculated through pulses;
the measuring head 31 comprises two Hall sensors for converting the change of the magnetic field into pulse to output two groups of pulse signals, the Hall sensors correspondingly output two groups of pulse signals, the rotation direction of the magnetic encoder can be judged through the initial phase difference of the two groups of pulse signals, so that the displacement direction of the steel rail flaw detector is determined, the magnetic encoder replaces a photoelectric encoder, and the vibration resistance of the encoder is effectively improved because the influence of external vibration on the change of the magnetic field intensity is very little.
Further, magnetic encoder still includes spacing copper sheathing 4, spacing copper sheathing 4 with 3 fixed connection of base are in like this when spacing copper sheathing 4 rotates base 3 just can then rotate together, thereby drive measuring head 31 winds annular magnet 2 rotates.
Further, the limiting copper sleeve 4 comprises a limiting part 41, the limiting part 41 is arranged on the limiting copper sleeve 4, and the limiting part 41 is used for being clamped in a groove body 61 at one end inside the shell 6.
Further, the magnetic encoder further comprises a housing 6 and an end cover 5, wherein the housing 6 is arranged outside the ring magnet 2 and the base 3, the end cover 5 is arranged on the housing 6 through the central shaft 1, and the housing 6 is directly contacted with the upper surface of the steel rail.
Furthermore, a groove body 61 matched with the limiting copper sleeve 4 and the limiting part 41 is formed in the center of one end of the inner surface of the shell 6, so that when the steel rail moves relatively, the shell 6 drives the limiting copper sleeve 4 to rotate through the groove body 61.
Further, the magnetic encoder further comprises a transmission line 11 for transmitting pulse signals, the transmission line 11 is connected with the circuit board 32, and the transmission line 11 transmits the two groups of output pulse signals to the signal processing device.
Further, the base 3, the limiting copper sleeve 4, the outer shell 6 and the end cover 5 are movably connected with the central shaft 1, so that the base 3, the limiting copper sleeve 4, the outer shell 6 and the end cover 5 can rotate relatively.
Furthermore, the ring magnet 2 is fixedly connected to the central shaft 1, so that the measuring head 31 is rotated about the ring magnet 2, thereby measuring the magnetic field changes in the process.
Further, the end cover 5 is provided with a plurality of prepared holes for connecting the shell 6, the prepared holes uniformly penetrate through the edge of the end cover 5, and the end cover 5 and the shell 6 can be fixed together by utilizing self-tapping to penetrate through the prepared holes during assembly.
Further, the casing 6 and the end cover 5 are T-shaped when connected together, and the encoder is conveniently clamped at the upper end of the steel rail due to the T-shaped design.
The working principle is as follows: the magnetic encoder for the weld joint flaw detector comprises a shell 6, an end cover 5, a transmission line 11, a measuring head 31, a magnetic encoder, a transmission head, a measuring head 31, a magnetic sensor and a control circuit, wherein the end cover 5 and the shell 6 are fixed together by penetrating a reserved hole through self-tapping before use, the whole encoder is arranged at the lower end of the steel rail flaw detector through external threads at two ends of a central shaft 1 after the fixing is finished, the transmission line 11 is connected with the steel rail flaw detector, the whole encoder can be in a usable state, the shell 6 rotates on a steel rail during the advancing process of the steel rail flaw detector during use, the shell 6 drives the measuring head 31 to rotate around an annular magnet 2, when the measuring head 31 passes through one piece of magnetic steel, a high-level pulse is emitted, when the measuring head completely leaves the magnetic steel, a low-level pulse is emitted, the distance between each piece of magnetic steel is fixed, the size of each piece, in addition, the two Hall sensors output two groups of pulse signals successively, and the rotation direction of the magnetic encoder can be judged through the initial phase difference of the two groups of pulse signals, so that the displacement direction of the steel rail flaw detector is determined; and traditional photoelectric encoder's once output pulse, this magnetic encoder can once output two sets of pulses, measures same section displacement, can improve the precision of displacement measurement result to a certain extent like this, can satisfy the requirement of measurement better, and is comparatively practical.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a magnetic encoder for rail flaw detector which characterized in that: the magnetic field measuring device comprises a central shaft, an annular magnet, a magnetic field measuring element and a base for driving the magnetic field measuring element to rotate, wherein the annular magnet and the base are both arranged on the central shaft;
the magnetic field measuring element comprises a protective sleeve, a measuring head and a circuit board, the protective sleeve is arranged on the measuring head, the protective sleeve and the measuring head are both arranged on the circuit board, and the circuit board is connected with the base;
the measuring head comprises two Hall sensors for converting the change of the magnetic field into pulse output, and the two Hall sensors correspondingly output two groups of pulse signals;
the annular magnet comprises a plurality of magnetic steels and a body, and the magnetic steels are uniformly arranged on the body.
2. The magnetic encoder for a steel rail flaw detector according to claim 1, characterized in that: the magnetic encoder further comprises a limiting copper sleeve, and the limiting copper sleeve is fixedly connected with the base.
3. The magnetic encoder for a steel rail flaw detector according to claim 2, characterized in that: and the limiting copper sleeve is provided with a limiting part.
4. The magnetic encoder for a steel rail flaw detector according to claim 3, characterized in that: the magnetic encoder further comprises a shell and an end cover, the shell is arranged outside the annular magnet and the base, and the end cover penetrates through the central shaft and is connected with the shell.
5. The magnetic encoder for a steel rail flaw detector according to claim 4, characterized in that: and a groove body matched with the limiting copper sleeve and the limiting part is arranged at the center of one end of the inner surface of the shell.
6. The magnetic encoder for a steel rail flaw detector according to claim 5, characterized in that: the magnetic encoder further comprises a transmission line for transmitting pulse signals, and the transmission line is connected with the circuit board.
7. The magnetic encoder for a steel rail flaw detector according to claim 6, characterized in that: the base, the limiting copper sleeve, the shell and the end cover are all movably connected with the central shaft.
8. The magnetic encoder for a steel rail flaw detector according to claim 7, characterized in that: the annular magnet is fixedly connected with the central shaft.
9. The magnetic encoder for a steel rail flaw detector according to claim 8, characterized in that: the edge of end cover is provided with a plurality of preformed holes that are used for connecting the shell.
10. The magnetic encoder for a steel rail flaw detector according to claim 9, characterized in that:
the housing is T-shaped when connected to the end cap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920917275.XU CN210014748U (en) | 2019-06-18 | 2019-06-18 | Magnetic encoder for steel rail flaw detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920917275.XU CN210014748U (en) | 2019-06-18 | 2019-06-18 | Magnetic encoder for steel rail flaw detector |
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| Publication Number | Publication Date |
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| CN210014748U true CN210014748U (en) | 2020-02-04 |
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| CN201920917275.XU Active CN210014748U (en) | 2019-06-18 | 2019-06-18 | Magnetic encoder for steel rail flaw detector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110243389A (en) * | 2019-06-18 | 2019-09-17 | 邢台市超声检测设备有限公司 | A kind of rail flaw detector magnetic encoder and its measurement method |
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2019
- 2019-06-18 CN CN201920917275.XU patent/CN210014748U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110243389A (en) * | 2019-06-18 | 2019-09-17 | 邢台市超声检测设备有限公司 | A kind of rail flaw detector magnetic encoder and its measurement method |
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