A device for detecting missing yarn in spun fabric

Abstract

This utility model relates to a yarn defect detection device, comprising a frame, guide wheels, a swing arm, an elastic support mechanism, and a position sensor. The frame has baffles on both sides. Two guide wheels are rotatably connected between the baffles. A first round rod and a second round rod are positioned between the baffles. One end of the swing arm is hinged to the first round rod, and one end of the elastic support mechanism is hinged to the second round rod. The other end of the elastic support mechanism is hinged to the middle of the swing arm. The position sensor is mounted on the second round rod via an adjustable support arm, and its output end is located on the side of the swing arm. The swing arm can swing and pass between the guide wheels. When defects such as missing strips or tears appear at the edge of the yarn, the equipment automatically alarms and slows down to stop, preventing irreparable defects from occurring during weaving or subsequent processing, thus avoiding a chain reaction of production problems and reducing production interruptions and cost waste.

Description

Technical Field

[0001] This utility model relates to the field of textile production technology, specifically to a device for detecting missing yarn in spun fabric. Background Technology

[0002] In the unwinding stage of textile production, a continuous and complete supply of spun fabric is a crucial prerequisite for ensuring the stable operation of subsequent weaving and processing steps. If defects such as missing strands or tears occur during the unwinding process and are not detected and addressed promptly, the defective fabric will develop irreparable flaws in the finished product, such as holes, uneven density, and reduced strength, after entering the weaving or subsequent dyeing and printing stages. This directly leads to an increased product defect rate. Defective fabric requires rework, which not only wastes raw materials such as yarn and energy but may also cause production interruptions and rework due to equipment malfunctions caused by defective fabric, disrupting normal production rhythms, extending order delivery cycles, and increasing enterprise production costs. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a yarn defect detection device. When defects or tears appear on the edge of the yarn, the device automatically alarms and slows down to stop.

[0004] The technical solution of this utility model is as follows: a yarn defect detection device, including a frame, guide wheels, a swing arm, an elastic support mechanism, and a position sensor. The frame is provided with baffles on both sides. There are two guide wheels, which are rotatably connected between the baffles. A first round rod and a second round rod are provided between the baffles. One end of the swing arm is hinged to the first round rod, one end of the elastic support mechanism is hinged to the second round rod, and the other end of the elastic support mechanism is hinged to the middle of the swing arm. The position sensor is installed on the second round rod through an adjustable support arm. The output end of the position sensor is located on the side of the swing arm. The swing arm can swing and pass between the guide wheels.

[0005] Furthermore, the end of the swing arm is hook-shaped and faces the first round rod.

[0006] Furthermore, the elastic support mechanism includes a sleeve, a guide rod, and a spring. One end of the sleeve is hinged to the middle of the swing rod, and the other end of the sleeve is provided with a guide groove. One end of the guide rod is slidably connected in the guide groove, and the other end of the guide rod is provided with a support platform and hinged to the second round rod. The spring is sleeved on the guide rod and elastically connected between the sleeve and the support platform.

[0007] Furthermore, the sleeve has a limiting groove on its side that connects to the guide groove, and the guide rod has a limiting screw on its side that moves within the limiting groove.

[0008] Furthermore, a nut is threadedly connected to the guide rod, and a spring is elastically connected between the sleeve and the nut.

[0009] Furthermore, a washer is fitted onto the guide rod, and the washer is located between the spring and the nut.

[0010] Furthermore, both the first and second round rods are provided with limiting components, and one end of the swing rod and one end of the guide rod are respectively hinged to the first and second round rods in the limiting components.

[0011] Furthermore, the top of the frame is provided with a horizontally extending bracket, and a lamp tube is hung at the lower end of the bracket.

[0012] Compared with the prior art, the advantages of this utility model are as follows: when there are missing strips or tears on the edge of the gauze, the swing arm can swing under the push of the elastic support mechanism and pass through the gauze between the guide wheels, thereby triggering the position sensor. The equipment will automatically alarm and decelerate and stop, avoiding the phenomenon of missing strips causing irreparable defects in the gauze during weaving or subsequent processing, eliminating the chain reaction problems in the production process, thereby reducing the number of production interruptions and reducing cost waste. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the elastic support mechanism and swing arm of this utility model.

[0016] The components include: 1. Frame; 101. Baffle; 2. Guide wheel; 3. First round rod; 4. Second round rod; 5. Swing rod; 6. Guide rod; 601. Support platform; 7. Sleeve; 701. Limiting groove; 8. Limiting screw; 9. Spring; 10. Washer; 11. Nut; 12. Limiting assembly; 13. Adjustable support arm; 14. Position sensor; 15. Bracket; 16. Lamp tube. Detailed Implementation

[0017] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0018] like Figure 1-2As shown, a yarn defect detection device includes a frame 1, guide wheels 2, a swing rod 5, an elastic support mechanism, and a position sensor 14. The frame 1 has baffles 101 on both sides. Two guide wheels 2 are rotatably connected between the baffles 101 to provide guidance and support for the yarn. A first round rod 3 and a second round rod 4 are located between the baffles 101. One end of the swing rod 5 is hinged to the first round rod 3, and one end of the elastic support mechanism is hinged to the second round rod 4. The other end of the elastic support mechanism is hinged to the middle of the swing rod 5, allowing the elastic support mechanism to push the swing rod 5 outwards. The position sensor 14 is mounted on the second round rod 4 via an adjustable support arm 13. The output end of the position sensor 14 is located on the side of the swing rod 5 and is used to detect the position of the swing rod 5. When defects or tears appear at the edge of the yarn, the swing rod 5 can swing under the push of the elastic support mechanism. The yarn passes through the yarn between the guide rollers 2, triggering the position sensor 14. The equipment automatically alarms and slows down to stop, preventing sliver defects that could cause irreparable damage during weaving or subsequent processing, thus avoiding a chain reaction of production problems, reducing production interruptions and cost waste. The swing rod 5, elastic support mechanism, and position sensor 14 are symmetrically arranged on the first round rod 3 and the second round rod 4 of this device, respectively. When the yarn is unwound, the two elastic support mechanisms can provide thrust to the two swing rods 5 to abut against the lower end face of the yarn. The two swing rods 5 on both sides of the yarn can detect sliver defects separately without affecting each other. At the same time, the supporting effect of the two swing rods 5 can make the yarn more stable during the transfer process, effectively avoiding the yarn from gradually shifting towards the frame 1 during the journey due to unilateral support.

[0019] The end of the swing rod 5 is hook-shaped and faces the first round rod 3. The hook-shaped design makes the contact point between the swing rod 5 and the yarn fabric an arc structure, avoiding any sharp structure at the end of the swing rod 5 that could damage the yarn fabric and ensuring the quality of the yarn fabric. The hook-shaped swing rod 5 also detours to the side of the position sensor 14, which also provides favorable conditions for the detection of the position sensor 14 and improves the accuracy of signal feedback. The elastic support mechanism includes a sleeve 7, a guide rod 6, and a spring 9. One end of the sleeve 7 is hinged to the middle of the swing rod 5, and the other end of the sleeve 7 is provided with a guide groove. One end of the guide rod 6 is slidably connected in the guide groove, and the other end of the guide rod 6 is provided with a support platform 601 and hinged to the second round rod 4. The spring 9 is sleeved on the guide rod 6 and elastically connected between the sleeve 7 and the support platform 601. The spring 9 is used to open the sleeve 7 and transmit force to the swing rod 5, so that the swing rod 5 can stably abut against the lower end surface of the yarn fabric. If a missing piece of yarn occurs during production, the swing rod 5 will lose its relative support at the missing or torn part of the yarn and pop out, causing the sleeve 7 and guide rod 6 to detach from each other. After repairing the quality defect or eliminating the fault, the sleeve 7 and guide rod 6 need to be reconnected, which is inconvenient. Therefore, a limiting groove 701 with a connecting guide groove is provided on the side of the sleeve 7, and a limiting screw 8 is provided on the side of the guide rod 6. The limiting screw 8 moves within the limiting groove 701, which can provide sufficient swing stroke for the swing rod 5 and also prevent the sleeve 7 and guide rod 6 from detaching from each other. A nut 11 is threaded onto the guide rod 6. A spring 9 is elastically connected between the sleeve 7 and the nut 11. Adjusting the position of the nut 11 can appropriately compress the spring 9, thereby adjusting the force exerted by the spring 9 on the swing rod 5. This is equivalent to adjusting the force exerted by the swing rod 5 relative to the lower end face of the spun fabric, thus amplifying defects such as missing strips and tears in the spun fabric, making the detection conditions of this device more stringent. Two nuts 11 are provided to ensure that the nuts 11 are not easily loosened under the reaction force of the spring 9, thereby ensuring the relative stability of the force exerted by the spring 9. A washer 10 is fitted onto the guide rod 6, located between the spring 9 and the nut 11, providing a more stable support surface for the spring 9. Limiting components 12 are provided on the first round rod 3 and the second round rod 4. One end of the swing rod 5 and one end of the guide rod 6 are respectively hinged to the first round rod 3 and the second round rod 4 in the limiting components 12, preventing the swing rod 5, the elastic support mechanism, and the position sensor 14 from shifting, ensuring the normal operation of the spun fabric missing strip detection. The top of the frame 1 is provided with a horizontally extending bracket 15, and a lamp tube 16 is hung at the lower end of the bracket 15 to facilitate observation of the surface of the spun fabric and thus discover other quality defects.

[0020] According to the design scheme of this device, the equipment used for unwinding the spun yarn in the workshop is modified and dismantled. The excess guide wheels 2 are removed, and two of their rotating shafts are welded and fixed to form the first round rod 3 and the second round rod 4 in this device. Then, the swing arm 5, the elastic support mechanism, the adjustable support arm 13, and the position sensor 14 are installed. Based on the width of the rolled spun yarn and the unwinding position, the positions of the above components and mechanisms are adjusted accordingly to ensure that the hook-shaped end of the swing arm 5 can stably abut against the lower end face of the spun yarn. During the unwinding process, if there are missing strips or tears at the edge of the spun yarn, the swing arm 5, pushed by the elastic support mechanism, can swing and pass through the spun yarn between the guide wheels 2. The position sensor 14 loses its signal and feeds back to the equipment for automatic alarm and deceleration shutdown.

[0021] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A device for detecting missing yarn in spun fabric, comprising a frame, guide wheels, a swing arm, an elastic support mechanism, and a position sensor, characterized in that: Both sides of the frame are equipped with baffles. There are two guide wheels that are rotatably connected between the baffles. A first round rod and a second round rod are provided between the baffles. One end of the swing rod is hinged to the first round rod, and one end of the elastic support mechanism is hinged to the second round rod. The other end of the elastic support mechanism is hinged to the middle of the swing rod. The position sensor is mounted on the second round rod through an adjustable support arm. The output end of the position sensor is located on the side of the swing rod. The swing rod can swing and pass between the guide wheels.

2. The yarn defect detection device as described in claim 1, characterized in that: The end of the swing arm is hook-shaped and faces the first round rod.

3. The yarn defect detection device as described in claim 1, characterized in that: The elastic support mechanism includes a sleeve, a guide rod, and a spring. One end of the sleeve is hinged to the middle of the swing rod, and the other end of the sleeve is provided with a guide groove. One end of the guide rod is slidably connected in the guide groove, and the other end of the guide rod is provided with a support platform and hinged to the second round rod. The spring is sleeved on the guide rod and elastically connected between the sleeve and the support platform.

4. The yarn defect detection device as described in claim 3, characterized in that: The sleeve has a limiting groove on its side that connects to the guide groove, and the guide rod has a limiting screw on its side that moves within the limiting groove.

5. The yarn defect detection device as described in claim 3, characterized in that: Both the first and second round rods are equipped with limiting components, and one end of the swing rod and one end of the guide rod are respectively hinged to the first and second round rods in the limiting components.

6. The yarn defect detection device as described in claim 3 or 4, characterized in that: A nut is threaded onto the guide rod, and a spring is elastically connected between the sleeve and the nut.

7. The yarn defect detection device as described in claim 6, characterized in that: A washer is fitted onto the guide rod, and the washer is located between the spring and the nut.

8. The yarn defect detection device as described in claim 1, characterized in that: The top of the frame is equipped with a horizontally extending bracket, and a lamp tube is hung at the lower end of the bracket.

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