Yarn broken end automatic detection and alarm device of knitting machine

Abstract

The utility model relates to the related technical field of detection of broken ends of knitting yarns, and discloses an automatic detection and alarm device for broken ends of yarns of a knitting machine, which comprises a multi-mode sensing module arranged on a yarn advancing path, the infrared transmission type photoelectric sensor and the micro tension strain sensor are arranged at intervals in the yarn moving direction. Through cooperation of the multi-mode sensing module, the alarm triggering module and the control unit, the yarn breaking situation can be judged through double-signal combination, so that the yarn breaking misjudgment rate is reduced to the minimum, the situation that the use process is affected by misjudgment is avoided, and through cooperative detection of the photoelectric sensor and the tension bimode sensor, the detection accuracy is improved. The accuracy of the whole detection process is guaranteed, the overall response speed is increased, and the waste condition caused by slow response of the yarn is avoided.

Description

Technical Field

[0001] This utility model relates to the technical field of yarn breakage detection in knitting machines, and in particular to an automatic yarn breakage detection and alarm device for knitting machines. Background Technology

[0002] The yarn breakage detector for knitting machines is a device used to detect yarn abnormalities during the operation of knitting machines, ensuring that the yarn flows in an orderly manner within a reasonable range.

[0003] Most existing yarn breakage detection methods for knitting machines rely on a single sensor mode, which can easily lead to false alarms during yarn vibration. This results in significant detection errors, impacting both detection efficiency and the processing efficiency of the knitting machine. To address this issue, an automatic yarn breakage detection and alarm device for knitting machines is proposed. Utility Model Content

[0004] This invention provides an automatic yarn breakage detection and alarm device for knitting machines, which solves the problems mentioned in the background art.

[0005] The technical problem solved by this utility model is achieved through the following technical solution:

[0006] An automatic yarn breakage detection and alarm device for a knitting machine includes a multimodal sensing module installed on the yarn travel path, and infrared transmission photoelectric sensors and micro-tension strain sensors arranged at intervals along the yarn movement direction, with the distance between the two sensors being 20-30 times the yarn diameter.

[0007] It also includes an alarm triggering module for the user and fixed on the knitting machine frame, the alarm triggering module including a piezoelectric ceramic sounder and an LED strobe warning light;

[0008] The control unit integrated on the circuit board synchronously receives photoelectric signals and tension signals through a dual-channel signal processing circuit. When the difference between the two signals exceeds a preset threshold, the alarm module is activated.

[0009] The transmitter and receiver of the photoelectric sensor are arranged symmetrically at a 45° tilt angle.

[0010] Preferably, the micro-tension strain sensor comprises a V-shaped silicone elastomer with orthogonally arranged metal strain gauges attached to its surface.

[0011] Preferably, the control unit has a built-in multi-level signal processing mechanism, including:

[0012] The first-stage RC low-pass filter has a cutoff frequency of 500Hz.

[0013] The second-level dynamic threshold adjustment module automatically corrects the alarm threshold based on the yarn movement speed.

[0014] The third-level logic AND gate circuit requires both the photoelectric signal disconnection and the disappearance of tension to trigger the alarm.

[0015] Preferably, the multimodal sensing module is mounted behind the ceramic eye of the yarn guide via a magnetic quick-release base.

[0016] Preferably, the piezoelectric ceramic sound generator is connected to the knitting machine spindle via a vibration coupler.

[0017] Preferably, it also includes a yarn breakage location positioning module, which includes RFID tags and readers distributed at equal intervals along the yarn path, and automatically records the location information of the most recently passed tag when an alarm is triggered.

[0018] The advantages and positive effects of this utility model are: by combining the multimodal sensing module, the alarm triggering module, and the control unit, the yarn breakage situation can be judged by the joint use of dual signals, thereby minimizing the false judgment rate of yarn breakage and avoiding the impact of false judgment on the use process. Furthermore, by using photoelectric and tension dual-modal sensors for collaborative detection, the accuracy of the entire detection process is guaranteed, and the overall response speed is improved, avoiding the waste of yarn caused by slow response. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the modular structure of this utility model;

[0021] The markings in the attached diagram are described below:

[0022] 1. Multimodal sensing module; 11. Infrared transmission photoelectric sensor; 12. Micro-tension strain sensor;

[0023] 2. Alarm trigger module; 21. Piezoelectric ceramic sound generator; 22. LED strobe warning light;

[0024] 3. Control unit; 31. Dual-channel signal processing circuit; 311. RC low-pass filter; 312. Dynamic threshold adjustment module; 313. Logic AND gate circuit;

[0025] 4. Severed head location positioning module. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0027] The embodiments of this utility model will be further described in detail below with reference to the accompanying drawings:

[0028] Reference Figure 1 As shown, the yarn breakage detection device for knitting machines is a device used to detect yarn abnormalities during the operation of knitting machines. It can ensure that the yarn flows in an orderly manner within a reasonable range. Most existing yarn breakage detection devices for knitting machines use a single sensing mode, which can easily lead to false alarms during yarn vibration. This results in a large detection error for the detection device, affecting both detection efficiency and the processing efficiency of the knitting machine. To solve this problem, an automatic yarn breakage detection and alarm device for knitting machines is proposed, which includes a multi-modal sensing module 1 installed on the yarn travel path, and infrared transmission photoelectric sensors 11 and micro-tension strain sensors 12 arranged at intervals along the yarn movement direction. The distance between the two sensors is 20-30 times the yarn diameter.

[0029] It also includes an alarm triggering module 2 for the user and fixed on the knitting machine frame, the alarm triggering module 2 including a piezoelectric ceramic sounder 21 and an LED strobe warning light 22;

[0030] The control unit 3 integrated on the circuit board synchronously receives photoelectric signals and tension signals through the dual-channel signal processing circuit 31. When the difference between the two signals exceeds a preset threshold, the alarm module is activated.

[0031] The transmitter and receiver of the photoelectric sensor 11 are symmetrically arranged at a 45° tilt angle. Through the cooperation of the multimodal sensing module, the alarm triggering module, and the control unit, the yarn breakage situation can be judged by the joint use of dual signals, thereby minimizing the false judgment rate of yarn breakage and avoiding the impact of false judgment on the use process. Furthermore, the collaborative detection by photoelectric and tension dual-modal sensors ensures the accuracy of the entire detection process and improves the overall response speed, avoiding the waste of yarn caused by slow response.

[0032] It should be noted that the micro-tension strain sensor 12 includes a V-shaped silicone elastomer with orthogonally arranged metal strain gauges attached to its surface.

[0033] Furthermore, the control unit 3 incorporates a multi-level signal processing mechanism, including:

[0034] The first-stage RC low-pass filter 311 has a cutoff frequency of 500Hz.

[0035] The second-level dynamic threshold adjustment module 312 automatically corrects the alarm threshold according to the yarn movement speed.

[0036] The third-level AND gate circuit 313 requires both the photoelectric signal disconnection and the disappearance of tension to trigger the alarm.

[0037] Additionally, the multimodal sensing module 1 is mounted behind the ceramic eye of the yarn guide via a magnetic quick-release base.

[0038] It should also be noted that the piezoelectric ceramic sound generator 21 is connected to the knitting machine spindle via a vibration coupler.

[0039] Furthermore, the aforementioned dual-sensor 45° tilt layout is to effectively eliminate interference from reflections on the yarn surface, while the setting of the distance between the two sensors being 20-30 times the yarn diameter is to ensure the stability of the detection process.

[0040] Furthermore, it also includes a yarn breakage location positioning module 4, which contains RFID tags and readers distributed at equal intervals along the yarn path. When an alarm is triggered, it automatically records the location information of the most recently passed tag.

[0041] It should be emphasized that the embodiments described in this utility model are illustrative rather than limiting. Therefore, this utility model is not limited to the embodiments described in the specific implementation. Any other implementation methods derived by those skilled in the art based on the technical solutions of this utility model are also within the scope of protection of this utility model.

Claims

1. A yarn breakage automatic detection and alarm device for a knitting machine, characterized in that: The application relates to a yarn breakage detection device, which comprises a multi-modal sensing module (1) installed on a yarn running path, an infrared transmission photoelectric sensor (11) and a micro-tension strain sensor (12) arranged at intervals along the yarn movement direction, the interval between the two sensors being 20-30 times the yarn diameter. The application also comprises a user and an alarm triggering module (2) fixed on the rack of a knitting machine, wherein the alarm triggering module (2) comprises a piezoelectric ceramic sounder (21) and an LED stroboscopic warning light (22). The application further comprises a control unit (3) integrated on a circuit board, which synchronously receives photoelectric signals and tension signals through a double-channel signal processing circuit (31) and drives the alarm module when the difference between the two signals exceeds a preset threshold value. The emission end and the receiving end of the photoelectric sensor (11) are symmetrically arranged at an inclination angle of 45 degrees.

2. A yarn breakage automatic detection and alarm device for a knitting machine according to claim 1, characterized in that: The micro-tension strain sensor (12) comprises a V-shaped silicon rubber elastic body, and the surface of the V-shaped silicon rubber elastic body is attached with orthogonally arranged metal strain gauges.

3. A yarn breakage detection and alarm device for a knitting machine as claimed in claim 1, wherein: The control unit (3) is internally provided with a multi-stage signal processing mechanism, which comprises: a first-stage RC low-pass filter (311) with a cutoff frequency of 500 Hz; a second-stage dynamic threshold adjustment module (312) for automatically correcting the alarm threshold value according to the yarn movement speed; a third-stage logic AND gate circuit (313) which triggers the alarm only when the photoelectric signal is disconnected and the tension disappears at the same time.

4. The yarn breakage automatic detection and alarm device of the knitting machine according to claim 1, characterized in that: The multi-modal sensing module (1) is installed behind the ceramic eye of the yarn guide through a magnetic quick-release base.

5. The yarn breakage automatic detection and alarm device of the knitting machine according to claim 1, characterized in that: The piezoelectric ceramic sounder (21) is connected with the main shaft of the knitting machine through a vibration coupler.

6. A yarn breakage detection and alarm device for a knitting machine as claimed in claim 1, wherein: The application further comprises a broken end position positioning module (4) comprising RFID tags and readers equally distributed along the yarn path, which automatically records the position information of the nearest passing tag when the alarm is triggered.

Images