A broken wire detection system for a knitting machine

Abstract

The present invention relates to a device for intelligent broken yarn detection, which is characterized by comprising a ratchet device, a first-level pulley group, a second-level pulley group, a spring group, a force-bearing pulley device and a detection device. The ratchet device controls the release of the yarn through the cooperation between the ratchet and the pawl. The first-level pulley group, the second-level pulley group and the force-bearing pulley device form a three-pulley tension detection structure. The detection device collects the signals of the tension sensors and conducts data interaction with the knitting machine control system through a wireless communication module, and completes the functions of broken yarn detection and early warning. By means of an electromechanical method, the present invention solves the problems of inability to detect the yarn tension in real time and inability to quickly and accurately find the yarn carrier where the broken yarn occurs through mechanical structure design and sensor detection control technology, ensures the continuity of the knitting machine operation, improves the product quality, reduces the production cost and improves the production efficiency.

Description

Technical Field

[0001] The present invention relates to a broken wire detection system, and more particularly to an intelligent detection system for detecting whether a yarn is broken, belonging to the technical field of knitting fabrics by knitting machines. Background Art

[0002] With the continuous update of modern textile technologies and textile equipment, traditional textile equipment is developing towards the trends of automation, high speed, and continuous production. However, during the process of knitting products by textile equipment, the phenomenon of broken yarns may occur. For example, during the knitting process of a knitting machine, multiple yarn carriers need to carry yarn tubes to perform various movements to entangle the yarns and then knit a predetermined fabric. When the yarn tube carried by a certain yarn carrier breaks, the knitting machine still works, and the broken-yarn yarn carrier will still move along the preset trajectory. Since the broken wire phenomenon is difficult to detect during the operation of the knitting machine, only by relying on the staff to repeatedly inspect each yarn carrier during the operation of the knitting machine, which not only causes waste of resources, but also affects work efficiency and increases labor intensity. Currently, the existing broken wire detection equipment has a high cost, a relatively complex structure, and occupies a large space, making it difficult to be widely promoted in the textile industry. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: the problem that when a broken wire occurs during the knitting process of an existing knitting machine and cannot be detected in time, resulting in the inability to accurately knit a preset fabric.

[0004] To solve the above technical problem, the technical solution of the present invention is to provide a broken wire detection system for a knitting machine, which is characterized in that it includes a main body structure. At the top of the main body structure, there is a yarn guiding port, and at the bottom, there is a yarn bobbin around which a yarn is wound. The yarn bobbin can rotate freely, and the ratchet structure rotates synchronously with the yarn bobbin; on the main body structure, there are a pawl, a swing rod, a fixed-position first pulley group, a second pulley group that can move up and down, a force-bearing pulley device, and a detection device;

[0005] After the yarn is led out from the yarn bobbin, it sequentially passes around the first pulley group, the second pulley group, and the force-bearing pulley device and is fixed on the mandrel. The main body structure and the mandrel cooperate with each other to continuously lead the yarn out of the main body structure and wind it around the mandrel. During this process:

[0006] If the length of the yarn between the first pulley group and the second pulley group decreases, the yarn pulls the second pulley group to move upward from the initial position. The second pulley group drives the swing rod to swing in one direction. When the swing rod swings to a certain angle, it contacts the pawl, and as the length of the yarn between the first pulley group and the second pulley group continues to decrease, the swing rod drives the pawl to move away from the ratchet structure until the pawl leaves the initial position and disengages from the ratchet structure, causing the yarn tube to start rotating to release the yarn thereon;

[0007] If the length of the yarn between the first-level pulley set and the second-level pulley set increases, as the yarn bobbin rotates, the length of the yarn between the first-level pulley set and the second-level pulley set continuously increases. The second-level pulley set drops back to the initial position, and at the same time, the swing rod swings in the other direction until it disengages from the pawl. The pawl moves towards the ratchet structure until it returns to the initial position and engages with the ratchet structure, causing the yarn bobbin to stop rotating to stop the release of the yarn.

[0008] The detection device detects in real time the amount of deformation of the strain sensing element caused by the yarn tension acting on the force-bearing pulley device, and determines whether there is a broken wire according to this amount of deformation. Among them, different magnitudes of the force of the yarn tension acting on the force-bearing pulley device cause different degrees of deformation of the strain sensing element.

[0009] Preferably, one end of the yarn bobbin is designed as the ratchet structure.

[0010] Preferably, it further includes a swing rod reset mechanism. When the swing rod swings in the one direction, the swing rod reset mechanism generates a restoring force, and this restoring force enables the swing rod to accelerate and swing in the other direction.

[0011] Preferably, it further includes a pawl reset mechanism. When the pawl moves in the direction away from the ratchet structure, the pawl reset mechanism generates a restoring force, and this restoring force enables the pawl to accelerate and move in the direction of the ratchet structure.

[0012] Preferably, the force-bearing pulley device includes a cantilever beam and a force-bearing pulley provided on the cantilever beam. The cantilever beam is fixed to the main body structure, the strain sensing element is provided on the cantilever beam, and the yarn coming out of the second-level pulley set is wound around the force-bearing pulley and then fixed to the mandrel. The yarn tension acting on the force-bearing pulley causes the cantilever beam and the strain sensing element thereon to deform. The detection device detects in real time the amount of deformation of the strain sensing element to obtain a measured value A. If the measured value A is not greater than the measured value B, the detection device determines that there is a broken wire and thus generates an alarm. Otherwise, the detection device determines that there is no broken wire.

[0013] Due to the adoption of the above technical solutions, compared with the existing technologies, the present invention has the following advantages and positive effects: Measuring the amount of deformation caused by the yarn tension acting on the force-bearing pulley set by using the strain sensing element solves the problem that it is impossible to detect the yarn tension in real time when the yarn moves in an irregular trajectory in space; Setting up a warning device solves the problem that it is impossible to quickly and accurately find the position where the wire breaks; It ensures the continuity of the operation of the knitting machine, improves the product quality, reduces the production cost, and improves the production efficiency. Description of the Drawings

[0014] Figure 1Schematic structural diagram of the present invention;

[0015] Figure 2 Schematic diagram of the control flow of the present invention. In the figure, A is the value measured in real time during operation, and B is the initial measured value of the tension when the pre-stored yarn is in a freely tensioned state.

[0016] Figure 3 Schematic structural diagram of the force-bearing pulley device;

[0017] Figure 4 Schematic measurement principle diagram of the force-bearing pulley device; Specific implementation manners

[0018] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

[0019] As Figure 1 shown, a broken wire detection system for a knitting machine disclosed in this embodiment includes a main body structure 1, a ratchet device, a first-level pulley group 2, a second-level pulley group 202, a spring group, a force-bearing pulley device 604, and a detection device.

[0020] The top of the main body structure 1 is provided with a yarn guiding port 102, and the bottom is provided with a yarn bobbin wound with yarn, and the yarn bobbin can rotate freely. The ratchet device includes a ratchet structure 502 and a ratchet pawl 5. The ratchet structure 502 rotates synchronously with the yarn bobbin. In this embodiment, one end of the yarn bobbin is designed as the ratchet structure 502.

[0021] The detection device is installed on the main structure 1. The yarn is led out from the outlet of the main structure 1 and pasted on the mandrel. The yarn is continuously led out from the main structure 1 due to the upward traction movement of the mandrel. The yarn bobbin is installed at the lower part of the main structure 1, and one section of the yarn bobbin is provided with a ratchet structure 502. When the ratchet pawl 5 meshes with the ratchet 502, the yarn bobbin stops releasing yarn. When disengaged, the yarn starts to be released. The front end of the ratchet pawl 5 cooperates with the ratchet 502, and the rear end cooperates with the rear end of the swing rod 203. When the rear end of the swing rod 203 does not contact the rear end of the ratchet pawl 5, the front end of the ratchet pawl 5 meshes with the ratchet structure 502. When the rear end of the swing rod 203 contacts the rear end of the ratchet pawl 5, with the swing of the swing rod 203, it drives the ratchet pawl 5 to rotate away from the ratchet structure 502 until the front end of the ratchet pawl 5 disengages from the ratchet structure 502. In this embodiment, the middle of the ratchet pawl 5 is connected to the spring torsion spring 402. When the ratchet pawl 5 rotates away from the ratchet structure 502, the spring torsion spring 402 is continuously stretched to generate a restoring force. When the rear end of the swing rod 203 leaves the rear end of the ratchet pawl 5, the ratchet pawl 5 accelerates to rotate towards the ratchet structure 502 under the action of the spring torsion spring 402 until the front end of the ratchet pawl 5 re-engages with the ratchet structure 502.

[0022] The front end of the swing rod 203 is provided with a two-stage pulley group 202 that can move freely up and down. With the up and down movement of the two-stage pulley group 202, it drives the swing rod 203 to swing back and forth. In this embodiment, the two-stage pulley group 202 includes two pulleys. The middle of the swing rod 203 is connected to the spring 4. When the two-stage pulley group 202 moves upward, the swing rod 203 swinging in one direction continuously compresses the spring 4, causing the spring 4 to generate a restoring force. The restoring force of the spring 4 can make the swing rod 203 accelerate to swing in the other direction, thereby driving the two-stage pulley group 202 to accelerate downward.

[0023] Above the two-stage pulley group 202, there is a fixed-position one-stage pulley group 2, and the one-stage pulley group 2 also includes two pulleys.

[0024] A force-bearing pulley device 604 is provided between the one-stage pulley group 2 and the two-stage pulley group 202.

[0025] The force-bearing pulley device 604 is composed of a connecting piece 605, a strain sensing element 606 (which can be a single strain sensing element or a strain sensing element group composed of multiple strain sensing elements), a mounting base 607, a cantilever beam 608, and a force-bearing pulley 3. The force-bearing pulley 3 is installed on the cantilever beam 608 through the connecting piece 605, the strain sensing element 606 is attached to the cantilever beam 608, and the force-bearing pulley device 604 is installed on the main structure 1 through the mounting base 607.

[0026] After the yarn is led out from the yarn bobbin, it passes through the yarn guiding port 103 and winds around the first-stage pulley set 2 and the second-stage pulley set 202 in sequence. After the yarn coming out of the second-stage pulley set 202 winds around the force-bearing pulley device 604, it is then led out from the yarn guiding port 102 and adhered to the mandrel. As Figure 4 shown, the yarn forms a certain angle on the force-bearing pulley device 604. The yarn tension acts on the force-bearing pulley 3, causing the cantilever beam 608 to deform. The strain sensing element 606 attached to the cantilever beam 608 deforms accordingly. After the detection device detects this deformation amount, it calculates the yarn tension value based on the deformation amount.

[0027] The main structure 1 rotates around O 1 at a speed of V 2 first. After rotating several circles, it moves circumferentially around O 2 at a speed of V 1 to the next position and then rotates around O 1 at a speed of V 2 alternately. Meanwhile, the mandrel moves axially at a speed of V 3 During this process, the yarn is continuously led out from the main structure 1. The detection device real-time detects the deformation amount generated by the yarn tension acting on the force-bearing pulley device 604, and forms a measurement value A based on this deformation amount. If the measurement value A is not greater than the initial tension measurement value B of the pre-stored yarn in the free tension state of the force-bearing pulley device 604 measured in advance, it is determined that a broken wire occurs, thus generating an alarm. Otherwise, it is determined that no broken wire occurs.

[0028] In this embodiment, the detection device includes a main control chip 6, an LED 603, a tension sensor, and a wireless communication module 602. The tension sensor detects the deformation amount generated by the yarn tension acting on the force-bearing pulley device 604. After the signal collected by the tension sensor is processed accordingly, it is transmitted to the main control chip 6. After the main control chip completes the judgment of yarn breakage, if a broken wire occurs, the LED 603 is lit, and an instruction is transmitted to the knitting machine control system through the wireless communication module 602, and the knitting machine is controlled to stop working.

[0029] During the process of continuously drawing the yarn from the main body structure 1, the yarn pulls the secondary pulley set 202 upward and drives the swing rod 203 to swing in one direction. During the swinging process, the swing rod 203 continuously compresses the spring 4, causing the spring 4 to generate a restoring force. When the swing rod 203 swings to a certain angle, the rear end of the swing rod 203 contacts the rear end of the pawl 5. Then, as the length of the yarn between the primary pulley set 2 and the secondary pulley set 201 continuously decreases, the swing rod 203 drives the pawl 5 to move away from the ratchet structure 502 until the front end of the pawl 5 leaves the initial position and disengages from the ratchet structure 502, allowing the yarn tube to start releasing the yarn. During the movement of the pawl 5, the spring torsion spring 402 is continuously stretched by the pawl 5 to generate a restoring force. Then, as the length of the yarn between the primary pulley set 2 and the secondary pulley set 201 continuously increases, the swing rod 203 accelerates to swing in the other direction under the action of the restoring force generated by the spring 4, and the secondary pulley set 202 accelerates downward to return to the initial position. The rear end of the swing rod 203 leaves the rear end of the pawl 5, and the pawl 5 accelerates to move in the direction of the ratchet structure 502 under the action of the restoring force generated by the spring torsion spring 402 until the front end of the pawl 5 returns to the initial position and re-engages with the ratchet structure 502.

Claims

1. A broken wire detection system for a knitting machine, characterized in that, it includes a main body structure. At the top of the main body structure, there is a yarn guiding port, and at the bottom, there is a yarn bobbin wound with yarn. The yarn bobbin can rotate freely, and the ratchet structure rotates synchronously with the yarn bobbin; on the main body structure, there are a ratchet pawl, a swing rod, a first pulley group with a fixed position, a second pulley group that can move up and down, a force-bearing pulley device, and a detection device; After the yarn is led out from the yarn bobbin, it successively passes around the first pulley group, the second pulley group, and the force-bearing pulley device, and then is fixed on the mandrel. The main body structure and the mandrel cooperate with each other to continuously lead the yarn out of the main body structure and wind it around the mandrel. During this process: If the length of the yarn between the first pulley group and the second pulley group decreases, the yarn pulls the second pulley group to move upward from the initial position. The second pulley group drives the swing rod to swing in one direction. When the swing rod swings to a certain angle, it contacts the ratchet pawl. As the length of the yarn between the first pulley group and the second pulley group continues to decrease, the swing rod drives the ratchet pawl to move away from the ratchet structure until the ratchet pawl leaves the initial position and disengages from the ratchet structure, causing the yarn tube to start rotating to release the yarn on it; If the length of the yarn between the first pulley group and the second pulley group increases, as the yarn tube rotates, the length of the yarn between the first pulley group and the second pulley group continues to increase. The second pulley group falls back to the initial position, and at the same time, the swing rod swings in the other direction until it disengages from the ratchet pawl. The ratchet pawl moves towards the direction of the ratchet structure until the ratchet pawl returns to the initial position and engages with the ratchet structure, causing the yarn tube to stop rotating to stop the release of the yarn; The detection device detects in real time the deformation amount of the strain sensing element caused by the yarn tension acting on the force-bearing pulley device, and judges whether a broken wire occurs according to this deformation amount. Among them, different magnitudes of the force of the yarn tension acting on the force-bearing pulley device cause different degrees of deformation of the strain sensing element; The force-bearing pulley device includes a cantilever beam and a force-bearing pulley arranged on the cantilever beam. The cantilever beam is fixed on the main body structure. The strain sensing element is arranged on the cantilever beam. The yarn coming out of the second pulley group passes around the force-bearing pulley and is then fixed on the mandrel. The yarn tension acting on the force-bearing pulley causes the cantilever beam and the strain sensing element on it to deform. The detection device detects the deformation amount of the strain sensing element in real time to obtain a measured value A, and in the detection device, there is a tension initial measured value B when the yarn is in a free tension state. If the measured value A is not greater than the measured value B, the detection device judges that a broken wire has occurred and generates an alarm. Otherwise, the detection device judges that no broken wire has occurred.

2. The broken wire detection system for a knitting machine according to claim 1, characterized in that, one end of the yarn bobbin is designed as the ratchet structure.

3. The broken wire detection system for a knitting machine according to claim 1, characterized in that, it further includes a swing rod reset mechanism. When the swing rod swings in the one direction, the swing rod reset mechanism generates a restoring force, and this restoring force enables the swing rod to accelerate and swing in the other direction.

4. The broken wire detection system for a knitting machine according to claim 1, It is characterized in that it further includes a pawl reset mechanism. When the pawl moves away from the ratchet structure, the pawl reset mechanism generates a restoring force, and this restoring force enables the pawl to accelerate and move towards the direction where the ratchet structure is located.

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