CN111337059A - Method and system for detecting looseness of belt pulley of lower-hanging motor of sewing machine - Google Patents
Method and system for detecting looseness of belt pulley of lower-hanging motor of sewing machine Download PDFInfo
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- CN111337059A CN111337059A CN202010307702.XA CN202010307702A CN111337059A CN 111337059 A CN111337059 A CN 111337059A CN 202010307702 A CN202010307702 A CN 202010307702A CN 111337059 A CN111337059 A CN 111337059A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
- G01D5/245—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using a variable number of pulses in a train
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/10—Electrical or electromagnetic drives
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Abstract
The invention provides a method and a system for detecting looseness of a belt pulley of a lower-hanging motor of a sewing machine, and belongs to the technical field of sewing machine detection. It has solved thereby the problem that current sewing machine hold-in range skidded and can't effectively monitor and influence the sewing effect. The detection method comprises the following steps: s1, when the lower hanging motor rotates for one circle, the first sensor device sends N pulse signals; s2, when the upper shaft rotates one circle, the second sensor device sends out 1 positioning signal; s3, the counter of the controller performs cumulative counting M value on the number of the received pulse signals, and the magnitude of the cumulative counting M value and the magnitude of the N value are judged when the positioning signals are received; s4, when M is larger than N, the synchronous belt is judged to slip; and S5, when M is equal to N, judging that the synchronous belt does not slip, clearing the value of the counter M by the controller, and continuously executing the step S3 until the synchronous belt stops working. The monitoring method has the advantages of effectively detecting the slipping condition of the synchronous belt, timely adjusting or replacing the synchronous belt and simultaneously having low cost.
Description
Technical Field
The invention belongs to the technical field of sewing machine detection, and relates to a method and a system for detecting looseness of a belt pulley of a lower-hanging motor of a sewing machine.
Background
The overhead main shaft pivoted sewing machine of overhead main shaft of motor is dragged to a large amount of for hanging down in the use still in the existing market, for CN206970854U, name is a sewing machine with hanging motor down, this scheme includes sewing machine body and platen, sewing machine body set up on the platen, its characterized in that: the sewing machine body is provided with a main shaft rear section; the lower hanging motor is arranged on the lower surface of the bedplate, the rear section of the main shaft is connected with a first synchronous belt wheel through a screw, the first synchronous belt wheel is provided with teeth, the shaft of the lower hanging motor is provided with a second synchronous belt wheel through a screw, the second synchronous belt wheel is provided with teeth, and the teeth on the first synchronous belt wheel and the second synchronous belt wheel are meshed with the teeth on the synchronous belt.
However, in actual work, the synchronous belt is worn easily after being used for a long time, the friction between the worn synchronous belt and the first synchronous belt wheel and the second synchronous belt wheel is reduced, the slipping phenomenon is easy to occur, the transmission effect of the lower hanging motor on the upper shaft is seriously influenced, the sewing effect is further influenced, particularly, the penetrating power of the sewing machine is reduced when thick cloth is sewn, and the user experience is influenced.
Disclosure of Invention
The invention aims to solve the technical problems and provides a method and a system for detecting looseness of a belt pulley of a lower hanging motor of a sewing machine.
The purpose of the invention can be realized by the following technical scheme: a sewing machine lower hanging motor belt pulley looseness detection method is characterized by comprising the following steps:
s1, when the lower hanging motor rotates for one circle, the first sensor device sends N pulse signals, wherein N is more than or equal to 18 and less than or equal to 36;
s2, when the upper shaft rotates one circle, the second sensor device sends out 1 positioning signal;
s3, the controller receives the pulse signals and the positioning signals, the counter of the controller carries out accumulation counting M value on the number of the received pulse signals, and the size of the accumulation counting M value and the size of the N value are judged when the positioning signals are received;
s4, when M is larger than N, judging that the synchronous belt slips, stopping and giving an alarm;
s5, when M is equal to N, the synchronous belt is determined not to slip, the controller controls the counter M to zero, and the controller continues to execute the above step S3 until the operation is stopped.
In the method for detecting loosening of the belt pulley of the lower hanging motor of the sewing machine, the lower hanging motor in the step S1 is a four-pole-pair motor, and comprises four pairs of magnetic poles, namely four N poles and four S poles, and 8 magnetic poles in total, the first sensor device comprises three hall elements fixedly mounted on a rotor of the lower hanging motor, each hall element sends out 1 pulse signal when being positively paired with any one of the magnetic poles, and the number N of the pulse signals is 24.
In the method for detecting looseness of the belt pulley of the lower hanging motor of the sewing machine, the three Hall elements are arranged at intervals in a staggered mode, and when one Hall element is opposite to one magnetic pole, the other two Hall elements are respectively located at 1/3 and 2/3 of the two corresponding adjacent magnetic poles in the same clockwise direction.
In the method for detecting looseness of the motor belt pulley hung below the sewing machine, the second sensor device is a positioner or a hall sensor or a position sensor.
The utility model provides a sewing machine hangs loose detecting system of motor belt pulley down, includes the controller and is used for detecting the second sensor device of sewing machine upper shaft rotation information, its characterized in that still includes:
the first sensor device is arranged on the lower hanging motor and used for detecting the rotation information of the lower hanging motor, and the first sensor device sends N pulse signals when the lower hanging motor rotates for one circle, wherein N is more than or equal to 18 and less than or equal to 36;
the second sensor device is used for sending 1 positioning signal when the upper shaft rotates once;
the controller is used for receiving the pulse signals and the positioning signals, a counter of the controller carries out accumulation counting on the number of the received pulse signals by an M value, and the size of the accumulation counting M value and the size of the N value are judged when the positioning signals are received; if M is greater than N, the controller judges that the synchronous belt slips, controls the machine to stop and gives an alarm; if the M is equal to N, the controller judges that the synchronous belt does not slip, the controller controls the value of the counter M to be reset, and the counter is continuously controlled to carry out accumulation counting on the subsequently received pulse signals; until the work is stopped.
In the belt pulley looseness detection system for the lower hanging motor of the sewing machine, the lower hanging motor is a four-pole motor and comprises four pairs of magnetic poles which are four N poles and four S poles respectively and 8 magnetic poles in total, the first sensor device comprises three Hall elements fixedly mounted on a rotor of the lower hanging motor, each Hall element sends 1 pulse signal when being positively paired with any one magnetic pole, and the number N of the pulse signals is 24.
In the loosening detection system for the belt pulley of the lower hanging motor of the sewing machine, the three Hall elements are arranged at intervals in a staggered manner, and when one Hall element is aligned with one magnetic pole, the other two Hall elements are respectively positioned at 1/3 and 2/3 corresponding to the two adjacent magnetic poles in the same clockwise direction.
In the above system for detecting loosening of the motor pulley hung below the sewing machine, the second sensor device is a positioner or a hall sensor or a position sensor.
Compared with the prior art, the method and the system for detecting the looseness of the belt pulley of the under-hanging motor have the following advantages:
1. whether the synchronous belt between the lower hanging motor and the upper shaft is loosened and slipped can be conveniently and accurately detected, so that a user can be reminded of adjusting the tightness of the synchronous belt or replacing the synchronous belt in time, the influence of the slipping of the synchronous belt on power transmission to influence the sewing effect is avoided, and the user experience is reduced;
2. only need increase three hall element on the rotor of hanging the motor down, other hall sensor like second sensing device, the controller all is sewing machine itself from taking the structure, utilizes three hall element that increase and make full use of sewing machine on current hall sensor and the controller structure, mainly realizes whole detection through the software mode to low cost.
Drawings
FIG. 1 is a flow chart of the method for detecting looseness of a belt pulley of a lower-hanging motor of the sewing machine.
FIG. 2 is a schematic block diagram of a sewing machine lower hanging motor pulley looseness detection system.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
Example one
As shown in figure 1, the method for detecting looseness of the lower-hanging motor belt pulley of the sewing machine comprises the following steps:
s1, when the lower hanging motor rotates for one circle, the first sensor device sends N pulse signals, wherein N is more than or equal to 18 and less than or equal to 36;
the lower-hanging motor of the embodiment is a four-pole-pair motor, and comprises four pairs of magnetic poles, namely four N poles and four S poles, and totally 8 magnetic poles, the first sensor device comprises three Hall elements fixedly mounted on a rotor of the lower-hanging motor, and each Hall element sends 1 pulse signal when being aligned with any magnetic pole. When the lower hanging motor rotates for one circle, 8 magnetic poles are in direct-opposite relation with each Hall element once, therefore, each Hall element can send out 8 pulse signals totally when the lower hanging motor rotates for one circle, and therefore the number N of the pulse signals is 24. Of course, the lower-hanging motor can be other motors such as a 2-pole motor, a 3-pole motor and a 5-pole motor besides four-pole motors, and the value N can be set according to the number of the pole pairs of the motor which is actually used; meanwhile, the number of the Hall elements can be set according to the actual situation, and the number of the Hall elements is not limited to 3.
S2, when the upper shaft rotates one circle, the second sensor device sends out 1 positioning signal;
the second sensor device can be a positioner, and can also be a Hall sensor or a position sensor, and the Hall sensor which is installed in the existing shaft of the sewing machine is adopted in the embodiment, so that the hardware does not need to be additionally added, and the cost is reduced. The structure and the working principle of the Hall sensor are the prior art, and are not described in detail.
S3, the controller receives the pulse signals and the positioning signals, a counter of the controller carries out accumulated counting on the number of the received pulse signals by an M value, and the size of the accumulated counting M value and the size of the N value are judged when the positioning signals are received;
the initial value of M in the counter is 0, and every time a pulse signal is received, the value of M is added up to 1.
S4, when M is larger than N, judging that the synchronous belt slips, stopping and giving an alarm;
if the synchronous belt slips, namely the synchronous belt slips when driving the upper shaft, the lower hanging motor actually rotates more than one circle when the upper shaft rotates one circle, and when M is equal to N, the lower hanging motor just rotates one circle when the upper shaft rotates one circle; when M > N, it indicates that the controller receives a pulse signal of the next rotation of the lower suspension motor, specifically, in this embodiment, N is 24, and when M is equal to 25, it indicates that the first magnetic pole of the next rotation of the lower suspension motor is already aligned with one of the hall elements, and it indicates that the lower suspension motor rotates more than one rotation, and the synchronous belt slips.
In order to further improve the accuracy of detecting the slip of the synchronous belt, the three Hall elements are arranged at intervals in a staggered mode, and when one Hall element is opposite to one magnetic pole, the other two Hall elements are respectively located at 1/3 and 2/3 corresponding to the two adjacent magnetic poles in the same clockwise direction. That is, among the three hall elements, when one of the hall elements is aligned with one of the magnetic poles, the other two hall elements are not aligned with any one of the magnetic poles, and are located between two adjacent magnetic poles, and in the same clockwise or counterclockwise direction, one hall element is located at 1/3 between two adjacent magnetic poles, and the other hall element is located at 2/3 between two adjacent magnetic poles. The advantage that sets up like this is that, hang down when every rotates 1/3 of angle between the two adjacent magnetic poles of motor, all will have a hall element to just right with one of them magnetic pole thereby produce a pulse signal, and other two hall elements can not produce pulse signal this moment to make pulse signal's production even, can not produce the density condition. Specifically, in the embodiment, the angle between two adjacent magnetic poles is 45 ° for 8 magnetic poles, which is equivalent to that, a pulse signal is generated every time the under-hanging motor rotates 15 °. In practical work, when the synchronous belt slips, the lower hanging motor rotates for more than one turn but the more part of the lower hanging motor does not reach the next pulse to be sent, the M of the lower hanging motor is still equal to N, namely, the problem of detection precision exists, in order to improve the detection precision of the lower hanging motor, the position setting mode of the three Hall elements is adopted in the embodiment, the generated pulses are uniform, a pulse signal is generated every time the lower hanging motor rotates for 15 degrees, namely, the synchronous belt slips for more than 15 degrees, the pulse signal is detected by a system, and therefore the detection precision is greatly improved. Of course, in order to further improve the detection accuracy, the number of hall elements may be increased, for example, to 5, and then a pulse signal is generated every time the under-hook motor rotates by 9 °, that is, when the synchronous belt slips by more than 9 ° of rotation angle, the system detects the slip, and the number of hall elements may be set according to actual conditions.
For detection by adopting the method, the more the number of the antipodes is, the higher the detection accuracy is, because the more the number of the antipodes is, the more the number of pulses generated by one rotation of the lower hanging motor is, the denser the pulses are.
And S5, when M is equal to N, judging that the synchronous belt does not slip, clearing the value of the counter M by the controller, and continuously executing the step S3 until the synchronous belt stops working.
The controller judges that the lower hanging motor rotates once every circle, namely, the controller detects the lower hanging motor once every circle, namely, a circle detection period, and if the lower hanging motor does not slip normally, the counter M is reset to zero and counted again, so that the system is ensured to be detected normally.
The detection method can conveniently and accurately detect whether the synchronous belt between the lower hanging motor and the upper shaft is loosened and slipped, so that a user can be reminded to adjust the tightness of the synchronous belt or replace the synchronous belt in time, the influence of the slipping of the synchronous belt on power transmission on the sewing effect is avoided, and the user experience is reduced. Meanwhile, only three Hall elements are needed to be added to a rotor of the lower hanging motor, other Hall sensors such as a second sensing device and the controller are of a self-contained structure on the sewing machine, the three Hall elements are added, the existing Hall sensors and controller structures on the sewing machine are fully utilized, the whole detection is mainly realized through a software mode, and the software is convenient to realize and low in cost.
Example two
As shown in fig. 2, the loosening detection system for the motor pulley hung below the sewing machine comprises a controller and a second sensor device for detecting the rotation information of the upper shaft of the sewing machine, and further comprises:
the first sensor device is arranged on the lower hanging motor and used for detecting the rotation information of the lower hanging motor, and the first sensor device sends N pulse signals when the lower hanging motor rotates for one circle, wherein N is more than or equal to 18 and less than or equal to 36;
the second sensor device is used for sending 1 positioning signal when the upper shaft rotates one circle;
the controller is used for receiving the pulse signals and the positioning signals, a counter of the controller carries out accumulated counting on the number of the received pulse signals by an M value, and the sizes of the accumulated counting M value and the N value are judged when the positioning signals are received;
if M is greater than N, the controller judges that the synchronous belt slips, controls the machine to stop and gives an alarm;
if the M is equal to N, the controller judges that the synchronous belt does not slip, the controller controls the value of the counter M to be reset, and the counter is continuously controlled to carry out accumulation counting on the subsequently received pulse signals; until the work is stopped.
Further, the lower hanging motor is a four-pole-pair motor, and comprises four pairs of magnetic poles, namely four N poles and four S poles, and totally 8 magnetic poles, the first sensor device comprises three Hall elements fixedly mounted on a rotor of the lower hanging motor, each Hall element sends 1 pulse signal when being aligned with any magnetic pole, and the number of the pulse signals N is 24. The Hall elements are arranged in a staggered mode at intervals, and when one Hall element is opposite to one magnetic pole, the other two Hall elements are respectively located at 1/3 and 2/3 of the two corresponding adjacent magnetic poles in the same clockwise direction. The second sensor device is a locator or a hall sensor or a position sensor.
The specific detection method and detection principle are the same as those of the first embodiment, and are not described herein again.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (8)
1. A sewing machine lower hanging motor belt pulley looseness detection method is characterized by comprising the following steps:
s1, when the lower hanging motor rotates for one circle, the first sensor device sends N pulse signals, wherein N is more than or equal to 18 and less than or equal to 36;
s2, when the upper shaft rotates one circle, the second sensor device sends out 1 positioning signal;
s3, the controller receives the pulse signals and the positioning signals, the counter of the controller carries out accumulation counting M value on the number of the received pulse signals, and the size of the accumulation counting M value and the size of the N value are judged when the positioning signals are received;
s4, when M is larger than N, judging that the synchronous belt slips, stopping and giving an alarm;
s5, when M is equal to N, the synchronous belt is determined not to slip, the controller controls the counter M to zero, and the controller continues to execute the above step S3 until the operation is stopped.
2. The method as claimed in claim 1, wherein the under-hook motor in step S1 is a four-pole motor including four pairs of magnetic poles, i.e., four N poles and four S poles, for a total of 8 magnetic poles, and the first sensor device includes three hall elements fixedly mounted on a rotor of the under-hook motor, each hall element emitting 1 pulse signal when positively paired with any one of the magnetic poles, and the number N of the pulse signals is 24.
3. The method as claimed in claim 2, wherein the three hall elements are staggered, and when one hall element is aligned with one of the magnetic poles, the other two hall elements are respectively located at 1/3 and 2/3 corresponding to two adjacent magnetic poles in the same clockwise direction.
4. The method for detecting loosening of the pulley of the lower hanging motor of the sewing machine as claimed in claim 1, 2 or 3, wherein the second sensor device is a positioner, a Hall sensor or a position sensor.
5. The utility model provides a sewing machine hangs loose detecting system of motor belt pulley down, includes the controller and is used for detecting the second sensor device of sewing machine upper shaft rotation information, its characterized in that still includes:
the first sensor device is arranged on the lower hanging motor and used for detecting the rotation information of the lower hanging motor, and the first sensor device sends N pulse signals when the lower hanging motor rotates for one circle, wherein N is more than or equal to 18 and less than or equal to 36;
the second sensor device is used for sending 1 positioning signal when the upper shaft rotates once;
the controller is used for receiving the pulse signals and the positioning signals, a counter of the controller carries out accumulation counting on the number of the received pulse signals by an M value, and the size of the accumulation counting M value and the size of the N value are judged when the positioning signals are received; if M is greater than N, the controller judges that the synchronous belt slips, controls the machine to stop and gives an alarm; if the M is equal to N, the controller judges that the synchronous belt does not slip, the controller controls the value of the counter M to be reset, and the counter is continuously controlled to carry out accumulation counting on the subsequently received pulse signals; until the work is stopped.
6. The sewing machine lower hook motor pulley looseness detection system according to claim 5, wherein said lower hook motor is a four-pole pair motor including four pairs of magnetic poles, four N poles and four S poles respectively, for 8 magnetic poles, said first sensor device includes three hall elements fixedly mounted on a rotor of the lower hook motor, each of said hall elements emitting 1 pulse signal when being in a positive pair with any of said magnetic poles, and said number N of pulse signals is 24.
7. The sewing machine lower hanging motor pulley looseness detection system of claim 6, wherein three said Hall elements are arranged in a staggered manner, and when one of the Hall elements is aligned with one of the magnetic poles, the other two Hall elements are respectively located at 1/3 and 2/3 corresponding to two adjacent magnetic poles in the same clockwise direction.
8. The sewing machine lower hanging motor pulley looseness detection system according to claim 5, 6 or 7, wherein said second sensor device is a locator or a hall sensor or a position sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010307702.XA CN111337059A (en) | 2020-04-17 | 2020-04-17 | Method and system for detecting looseness of belt pulley of lower-hanging motor of sewing machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010307702.XA CN111337059A (en) | 2020-04-17 | 2020-04-17 | Method and system for detecting looseness of belt pulley of lower-hanging motor of sewing machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114947189A (en) * | 2022-05-16 | 2022-08-30 | 河南中烟工业有限责任公司 | Automatic detection device and method for loosening of lifting chain belt of cigarette machine auxiliary connection equipment |
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Application publication date: 20200626 |