CN109613454B - Real-time fault detection method and detection device for needle selection head of needle selector - Google Patents
Real-time fault detection method and detection device for needle selection head of needle selector Download PDFInfo
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- CN109613454B CN109613454B CN201811530036.5A CN201811530036A CN109613454B CN 109613454 B CN109613454 B CN 109613454B CN 201811530036 A CN201811530036 A CN 201811530036A CN 109613454 B CN109613454 B CN 109613454B
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- needle selector
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
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- Condensed Matter Physics & Semiconductors (AREA)
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- Knitting Machines (AREA)
Abstract
The invention discloses a real-time fault detection method for a needle selection head of a needle selector, which comprises the steps of measuring a synthetic magnetic field when the needle selection head moves between an initial position and an action position by a magnetic sensor under the actual working state of the needle selection head of the needle selector, measuring working parameters of the synthetic magnetic field, measuring normal state parameters of the synthetic magnetic field under the normal working state of the needle selection head of the needle selector, comparing the working parameters with the normal state parameters, judging whether the action of the needle selection head of the needle selector fails, wherein the synthetic magnetic field is the synthetic magnetic field of a permanent magnet of the needle selection head and a driving electromagnet corresponding to the needle selection head in the needle selector. The invention also discloses a real-time fault detection device for the needle selection head of the needle selector. The working state of the needle selecting head is determined by measuring the changes of the magnetic fields near the electromagnet and the needle selecting head by adopting the magnetic-sensitive sensor. The detection method has the characteristics of less influence on the working site environment of the electromagnetic needle separator, high reliability and long service life.
Description
Technical Field
The invention relates to a needle selector fault detection method and a detection device, in particular to a needle selector real-time fault detection method and a detection device.
Background
The needle selector is quite widely used in knitting equipment, has various types and large using amount, is a key part which directly influences the whole performance of the knitting equipment, and has huge proportion in the needle selector of the knitting equipment. The electromagnetic needle selector usually consists of an aluminum frame, an electromagnet, a rotating shaft, a needle selecting tool bit with a permanent magnet and a control circuit board, and the electromagnetic needle selector attracts the needle selecting tool bit with the permanent magnet to swing to different positions by controlling the magnetic field direction of the electromagnet so as to achieve the purpose of needle selection.
The electromagnetic needle selector in the current market has the faults that the needle selecting tool bit does not swing in place or does not swing enough and the like, and the faults can be conveniently detected by an optical-based method, but in the actual working environment of the electromagnetic needle selector, an optical device is easily blocked by oil stains and fibers to cause wrong detection results, so the optical-based detection method is mainly used in the production link of the electromagnetic needle selector. At present, a reliable real-time detection means is lacked in an actual working environment, which often causes a large amount of defective cloth articles in a production process and brings huge economic loss to users.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a real-time fault detection method for a needle selecting head of a needle selector, which is applied to the actual work of the needle selector and avoids oil stains, fiber impurities and the like from influencing the detection result. Another task of the invention is to provide a real-time fault detection device for the needle selection head of the needle selector.
The technical scheme of the invention is as follows: a real-time fault detection method for a needle selection head of a needle selector comprises the steps of measuring a synthetic magnetic field of the needle selection head when the needle selection head moves between an initial position and an action position by a magnetic sensor when the needle selection head of the needle selector is in an actual working state, measuring working parameters of the synthetic magnetic field, measuring normal state parameters of the synthetic magnetic field when the needle selection head of the needle selector is in a normal working state, comparing the working parameters with the normal state parameters, and judging whether the needle selection head of the needle selector has a fault or not, wherein the synthetic magnetic field is a synthetic magnetic field of a permanent magnet of the needle selection head and a driving electromagnet corresponding to the needle selection head in the needle selector.
Further, the working parameters of the synthetic magnetic field are a magnetic field intensity peak value at an air gap formed by the driving electromagnet and the permanent magnet and a duration time of the magnetic field intensity peak value when the permanent magnet of the needle selecting head and the driving electromagnet corresponding to the needle selecting head are on the same axis, and the normal state parameters are the magnetic field intensity peak value and the duration time of the magnetic field intensity peak value when the needle selecting head is in a normal working state.
Further, whether the needle selection action of the needle selector has a fault or not is judged by comparing the working parameter with the normal state parameter when the magnetic field intensity peak value in the actual working state is smaller than the threshold value of the magnetic field intensity peak value in the normal working state or when the duration time of the magnetic field intensity peak value in the actual working state is larger than the threshold value of the duration time of the magnetic field intensity peak value in the normal working state, the needle selection action is judged to be the fault.
Further, the operating parameters of the synthetic magnetic field are the synthetic magnetic field strength of the needle selecting head at the initial position and the operating position and the time that the needle selecting head moves from the initial position to the operating position, and the normal state parameters are the synthetic magnetic field strength of the needle selecting head in the normal operating state and the time that the needle selecting head moves from the initial position to the operating position.
Further, whether the needle selection head action of the needle selector fails or not is judged by comparing the operating parameter with the normal state parameter, if the combined magnetic field intensity of the needle selection head at the initial position in the actual operating state is smaller than the threshold of the combined magnetic field intensity of the needle selection head at the initial position in the normal operating state or the combined magnetic field intensity of the needle selection head at the action position in the normal operating state is smaller than the threshold of the combined magnetic field intensity of the needle selection head at the action position in the normal operating state or the time that the needle selection head moves from the initial position to the action position in the actual operating state is longer than the threshold of the time that the needle selection head moves from the initial position to the action position in the normal operating state, the needle selection head is judged to be failed.
A real-time fault detection device for a needle selection head of a needle selector comprises a magnetic sensor, a processing module and a judgment module, wherein the magnetic sensor is arranged at an air gap position of a permanent magnet of the needle selection head and a driving electromagnet corresponding to the needle selection head and is positioned on an axle wire of the driving electromagnet, the position of the magnetic sensor relative to the driving electromagnet is fixed, the processing module receives a signal of the magnetic sensor to obtain a magnetic field intensity peak value and duration time of the magnetic field intensity peak value of the position where the magnetic sensor is located, and the judgment module judges whether the needle selection head action of the needle selector is faulty or not according to the magnetic field intensity peak value and the duration time of the magnetic field intensity peak value.
The real-time fault detection device for the needle selection head of the needle selector is characterized by comprising a magnetic sensor, a processing module and a judgment module, wherein the magnetic sensor is arranged on a permanent magnet of the needle selection head and is far away from one pole of a driving electromagnet corresponding to the needle selection head, the processing module receives signals of the magnetic sensor to obtain the magnetic field intensity of the position of the magnetic sensor when the needle selection head is at an initial position and an action position and the time elapsed from the initial position to the action position, and the judgment module judges whether the action of the needle selection head of the needle selector is faulty or not according to the magnetic field intensity and the time elapsed from the initial position to the action position of the needle selection head.
Furthermore, the magnetic field sensitivity direction of the magnetic sensor is perpendicular to the rotation plane of the needle selecting head.
Compared with the prior art, the invention has the advantages that: the working state of the needle selecting head is determined by measuring the changes of the magnetic fields near the electromagnet and the needle selecting head by adopting the magnetic-sensitive sensor. The detection method has the characteristics of less influence on the working site environment of the electromagnetic needle separator, high reliability and long service life.
Drawings
Fig. 1 is a schematic view of a mounting position structure of a magnetic sensor in a needle selection real-time failure detection device of a needle selector in embodiment 1.
Fig. 2 is a schematic view of the mounting position structure of a magnetic sensor in the needle selection head real-time failure detection device of the needle selector in embodiment 2.
Fig. 3 is a schematic diagram of a needle selection real-time fault detection device module of the needle selector.
Detailed Description
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention thereto.
In the prior art, a needle selector is mainly structured as shown in fig. 2, and includes an aluminum frame 1, a driving electromagnet 2, a rotating shaft 3, and a needle selector 4. The driving electromagnet 2 and the rotating shaft 3 are fixed in an aluminum frame, and the needle selecting head 4 is connected with the aluminum frame 1 through the rotating shaft 3; the needle selecting head 4 comprises a permanent magnet 5, and an air gap 6 exists between the permanent magnet 5 and the iron core of the driving electromagnet 2. When the electromagnetic needle selector works, the driving electromagnet 2 generates a magnetic field under the control of the control circuit board, and the magnetic field pushes away the repulsive magnetic pole of the permanent magnet 5 and attracts the attractive magnetic pole of the permanent magnet 5, so that the swinging function of the needle selecting head is controlled.
The failure of the electromagnetic needle selector is mainly represented as that the needle selection head does not swing in place or does not swing normally, and the reasons for the failure are as follows: the invention realizes the fault detection of the electromagnetic needle selector based on the abnormal change.
Embodiment 1, please refer to fig. 1 and fig. 3, a needle selection real-time fault detection device of a needle selector according to this embodiment includes a magnetic sensor 7, a processing module 8, and a determining module 9. The magnetic sensor 7 is arranged right above the air gap and on the side surface of the permanent magnet 5 and is positioned on the central axis of the driving electromagnet 2, and when the needle selection head moves, the position of the magnetic sensor 7 relative to the driving electromagnet 2 is fixed. The magnetic field sensitivity direction of the magnetic sensor 7 is perpendicular to the rotation plane of the needle selecting head 4. At the moment that the direction of the magnetic field of the driving electromagnet 2 is changed in the normal working state of the electromagnetic needle selector, the magnetic pole of the permanent magnet 5 close to the driving electromagnet 2 and the direction of the magnetic field of the driving electromagnet 2 repel each other, and the combined magnetic field of the permanent magnet and the driving electromagnet generates a peak value in the direction vertical to the rotation plane of the needle selecting head. The peak value of the magnetic field intensity and the duration of the peak value of the magnetic field intensity are obtained by the processing module 8 according to the signal of the magnetic sensor 7. The following judgment is made by the judgment module 9: when the peak value of the magnetic field strength measured in the actual working state is smaller than the threshold value (for example, 85%) of the peak value of the magnetic field strength in the normal working state or when the duration time of the peak value of the magnetic field strength in the actual working state is larger than the threshold value (for example, 110%) of the duration time of the peak value of the magnetic field strength in the normal working state, it is determined that the corresponding needle selecting head 4 is in a fault, otherwise, it is determined that the needle selecting head is.
Claims (6)
1. A real-time fault detection method for a needle selection head of a needle selector is characterized by comprising the steps of measuring a synthetic magnetic field when the needle selection head moves between an initial position and an action position by a magnetic sensor when the needle selection head of the needle selector is in an actual working state, measuring working parameters of the synthetic magnetic field, measuring normal state parameters of the synthetic magnetic field when the needle selection head of the needle selector is in a normal working state, comparing the working parameters with the normal state parameters to judge whether the needle selection head of the needle selector has a fault or not, wherein the synthetic magnetic field is a synthetic magnetic field of a permanent magnet of the needle selection head and a driving electromagnet corresponding to the needle selection head in the needle selector, the working parameters of the synthetic magnetic field are a magnetic field intensity peak value at an air gap formed by the driving electromagnet and the permanent magnet and the duration time of the magnetic field intensity peak value when the permanent magnet of the needle selection head and the driving electromagnet corresponding to the needle selection head are on the same axis, the normal state parameters are the magnetic field intensity peak value and the duration of the magnetic field intensity peak value when the needle selection head is in a normal working state.
2. The needle selector needle selection real-time failure detection method according to claim 1, characterized in that whether the needle selector needle selection action has a failure is determined by comparing the operating parameter with a normal state parameter when the peak value of the magnetic field strength in an actual operating state is smaller than the threshold value of the peak value of the magnetic field strength in a normal operating state or when the time during which the peak value of the magnetic field strength in an actual operating state continues is larger than the threshold value of the time during which the peak value of the magnetic field strength in a normal operating state continues, the needle selector needle selection failure is determined.
3. The needle selector real-time failure detection method according to claim 1, wherein the operating parameters of the combined magnetic field are a combined magnetic field strength of the needle selector at an initial position and an operating position and a time elapsed for the needle selector to move from the initial position to the operating position, and the normal state parameters are the combined magnetic field strength of the needle selector in a normal operating state and the time elapsed for the needle selector to move from the initial position to the operating position.
4. The needle selector needle selection real-time failure detection method according to claim 3, wherein the step of comparing the operating parameter with the normal state parameter to determine whether the failure of the needle selector needle selection is determined when the combined magnetic field strength of the needle selector at the initial position in the actual operating state is smaller than the threshold of the combined magnetic field strength of the needle selector at the initial position in the normal operating state, or the combined magnetic field strength of the needle selector at the operating position is smaller than the threshold of the combined magnetic field strength of the needle selector at the operating position in the normal operating state, or the time that the needle selector moves from the initial position to the operating position in the actual operating state is longer than the threshold of the time that the needle selector moves from the initial position to the operating position in the normal operating state, the failure of the needle selector is determined.
5. The real-time fault detection device for the needle selection head of the needle selector is characterized by comprising a magnetic sensor, a processing module and a judgment module, wherein the magnetic sensor is arranged at an air gap position of a permanent magnet of the needle selection head and a driving electromagnet corresponding to the needle selection head and is positioned on a central axis of the driving electromagnet, the position of the magnetic sensor relative to the driving electromagnet is fixed, the processing module receives a signal of the magnetic sensor to obtain a magnetic field intensity peak value and duration time of the magnetic field intensity peak value at the position where the magnetic sensor is located, and the judgment module judges whether the needle selection head action of the needle selector fails or not according to the magnetic field intensity peak value and the duration time of the magnetic field intensity peak value.
6. The real-time needle selection failure detection device of the needle selector according to claim 5, wherein the magnetic field sensitivity direction of the magnetic sensor is perpendicular to the rotation plane of the needle selector.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811530036.5A CN109613454B (en) | 2018-12-14 | 2018-12-14 | Real-time fault detection method and detection device for needle selection head of needle selector |
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| CN201811530036.5A CN109613454B (en) | 2018-12-14 | 2018-12-14 | Real-time fault detection method and detection device for needle selection head of needle selector |
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| CN109613454A CN109613454A (en) | 2019-04-12 |
| CN109613454B true CN109613454B (en) | 2020-12-11 |
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| CN110530564B (en) * | 2019-09-07 | 2021-04-06 | 浙江宸通电子科技有限公司 | Tool bit detection equipment of needle selector |
Citations (6)
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|---|---|---|---|---|
| JPH0314663A (en) * | 1989-06-12 | 1991-01-23 | Gunze Ltd | Sensor for needle breakage in knitting machine |
| CN101831742A (en) * | 2010-05-28 | 2010-09-15 | 王弋 | Heald raising detection method of electronic jacquard machine |
| CN101886934A (en) * | 2009-05-14 | 2010-11-17 | 曾卫东 | Positioning method and system based on hall element |
| CN107179096A (en) * | 2016-03-11 | 2017-09-19 | Tdk株式会社 | Rotation angle detection apparatus |
| CN108193376A (en) * | 2018-02-06 | 2018-06-22 | 福建睿能科技股份有限公司 | Straight-bar machines and its probe induced device |
| CN108642699A (en) * | 2018-07-18 | 2018-10-12 | 广东创达自动化装备有限公司 | A kind of trouble hunting system and method for the electromagnetic needle selector of circular knitting machine |
-
2018
- 2018-12-14 CN CN201811530036.5A patent/CN109613454B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0314663A (en) * | 1989-06-12 | 1991-01-23 | Gunze Ltd | Sensor for needle breakage in knitting machine |
| CN101886934A (en) * | 2009-05-14 | 2010-11-17 | 曾卫东 | Positioning method and system based on hall element |
| CN101831742A (en) * | 2010-05-28 | 2010-09-15 | 王弋 | Heald raising detection method of electronic jacquard machine |
| CN107179096A (en) * | 2016-03-11 | 2017-09-19 | Tdk株式会社 | Rotation angle detection apparatus |
| CN108193376A (en) * | 2018-02-06 | 2018-06-22 | 福建睿能科技股份有限公司 | Straight-bar machines and its probe induced device |
| CN108642699A (en) * | 2018-07-18 | 2018-10-12 | 广东创达自动化装备有限公司 | A kind of trouble hunting system and method for the electromagnetic needle selector of circular knitting machine |
Non-Patent Citations (1)
| Title |
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| 基于虚拟仪器的针织机械用高速电磁阀测试***;霍铖宇等;《纺织学报》;20111031;第32卷(第10期);134-140 * |
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