Yarn twist test device

Abstract

The utility model discloses a yarn twist test device, comprising: a sample pulling mechanism, which comprises a front roller assembly and a rear roller assembly, wherein the yarn sample is fed in through the front roller assembly and pulled out by the rear roller assembly; an imaging mechanism, which is arranged between the front roller assembly and the rear roller assembly, and is used to obtain an appearance image of the yarn sample, and comprises a photographing component and a light source arranged opposite to the photographing component; a control unit, wherein the sample pulling mechanism and the imaging mechanism are connected to the control unit by signals, and the control unit obtains the number of crests or troughs of the yarn appearance profile according to the appearance image of the yarn sample obtained by the imaging mechanism, and obtains the twist of the yarn sample. The yarn twist test device provided by the utility model can quickly measure the twist of the yarn and improve production efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of yarn testing, in particular to a yarn twist testing device. Background Art

[0002] The purpose of yarn twisting is to improve the tightness and structural stability of the yarn. The twist directly affects the physical properties of the yarn, the fabric style, and the performance of the finished garment. Therefore, it is of great significance to accurately test and control the twist of the yarn.

[0003] The twist test is generally measured using a yarn twist meter. The test methods include direct counting method and untwisting method. The direct counting method is to clamp the two ends of a certain length of sample under a specified tension, rotate one end of the sample to untwist the sample, and measure the number of twists when the sample components are parallel. The untwisting and twisting method is to measure the total number of turns per inch (or centimeter) by untwisting and re-twisting the sample.

[0004] At present, the twist test of twisted yarn is generally carried out using a yarn twist meter. The continuous sampling stability of the manual twist test is poor, resulting in poor consistency of the results, which affects the accuracy of the results, especially when the direct counting method is used for measurement, which is not only labor-intensive but also requires a lot of manpower. Although the automatic twist meter overcomes some of the shortcomings of the manual twist meter, its test speed is slow. Not only can it not perform untwisting tests on samples such as ply yarns, but it also cannot provide sufficient test tension for twist tests of some yarns that require larger test tensions. Utility Model Content

[0005] The utility model aims to provide a yarn twist testing device with high testing speed and reduced labor intensity.

[0006] Based on the above problems, the technical solution provided by the utility model is:

[0007] Yarn twist testing device, comprising:

[0008] A sample pulling mechanism, comprising a front roller assembly and a rear roller assembly, wherein the yarn sample is fed in through the front roller assembly and pulled out by the rear roller assembly;

[0009] An imaging mechanism, which is arranged between the front roller assembly and the rear roller assembly and is used to obtain an appearance image of the yarn sample, and includes a photographing component and a light source arranged opposite to the photographing component;

[0010] The control unit is connected to the sample traction mechanism and the imaging mechanism by signal. The control unit obtains the number of crests or troughs of the yarn appearance profile according to the appearance image of the yarn sample obtained by the imaging mechanism to obtain the twist of the yarn sample.

[0011] In some of the embodiments, a tension sensor mechanism is further included which is connected to the control unit signal and is disposed between the front roller assembly and the imaging mechanism for measuring the tension value of the yarn sample. The control unit adjusts the rotational speed difference between the front roller assembly and the rear roller assembly according to the tension measured by the tension sensor mechanism.

[0012] Based on the above problems, the second technical solution provided by the utility model is:

[0013] Yarn twist testing device, comprising:

[0014] A sample fixing mechanism, which is used to fix a segment of a yarn sample, comprising a fixed clamping assembly connected to one end of the yarn sample, and a sliding clamping assembly connected to the other end of the yarn sample;

[0015] An imaging mechanism, which is used to obtain an appearance image of the yarn sample, comprising a photographing component and a light source arranged opposite to the photographing component;

[0016] A moving mechanism, which is transmission-connected with the imaging mechanism and is used to drive the imaging mechanism to move along the length direction of the yarn sample;

[0017] The control unit is connected to the imaging mechanism and the moving mechanism by signal. The control unit obtains the number of peaks or troughs of the yarn appearance profile according to the appearance image of the yarn sample obtained by the imaging device, and obtains the twist of the yarn sample.

[0018] In some embodiments, the sliding clamping assembly includes a sliding clamping component connected to the yarn sample, a tension weight connected to the sliding clamping component, and a first guide rail component, the sliding clamping component is slidably connected to the frame via the first guide rail component, and the tension weight is connected to the sliding clamping component via a pull rope.

[0019] In some of the embodiments, the frame is further provided with a pulley assembly, and the pull rope is supported on the pulley assembly.

[0020] In some embodiments, the moving mechanism includes a driving motor and a screw assembly drivingly connected to the driving motor, and the imaging mechanism is drivingly connected to the screw assembly.

[0021] In some embodiments, the screw assembly includes a screw and a sliding block threadedly connected to the screw, the imaging mechanism is fixedly connected to the sliding block, and the sliding block is slidably connected to the frame via a second guide rail component.

[0022] In some of the embodiments, a tension sensor mechanism is further included which is connected to the control unit signal and is disposed between the sliding clamping assembly and the imaging mechanism for measuring the tension value of the yarn sample.

[0023] Compared with the prior art, the advantages of the utility model are:

[0024] An imaging mechanism is used to obtain an appearance profile image of the yarn sample, and a control unit obtains peak values ​​and trough values ​​of the thickness change of the appearance profile within a certain period, and the twist of the yarn is calculated according to the number of peak values ​​and trough values ​​and the number of strands of the yarn. The test speed is fast, the test stability is high, the data repeatability is good, the test result is highly accurate, the labor intensity is reduced, and the production efficiency is improved. The test speed of the traditional twist test method is 0.5m~1.0m / min, and the test speed of the present application can reach up to 400m / min at the fastest. If the traditional twist test method is to achieve this test amount, it takes a lot of time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. The drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 This is a structural schematic diagram of Embodiment 1 of the yarn twist testing device of the utility model;

[0027] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present utility model;

[0028] Figure 3 This is a schematic diagram of the apparent twist of the yarn in the embodiment of the utility model;

[0029] in:

[0030] 1. Front roller assembly;

[0031] 2. Rear roller assembly;

[0032] 3. Imaging mechanism 3-1. Housing 3-2. Photo taking component; 3-3. Light source;

[0033] 4. Tension sensor mechanism;

[0034] 5. Yarn sample;

[0035] 6. Fix the clamping assembly;

[0036] 7. Sliding clamping parts;

[0037] 8. Tension weight;

[0038] 9. The first guide rail;

[0039] 10. First slider;

[0040] 11. Support;

[0041] 12. Pulley;

[0042] 13. Driving motor;

[0043] 14. Screw rod;

[0044] 15. Slider;

[0045] 16. Second guide rail;

[0046] 17. Second slider;

[0047] 18. Rack;

[0048] 19. Pull the rope. DETAILED DESCRIPTION

[0049] The above scheme is further described below in conjunction with specific examples. It should be understood that these examples are used to illustrate the utility model and are not limited to the scope of the utility model. The implementation conditions used in the examples can be further adjusted according to the conditions of the specific manufacturer, and the implementation conditions not specified are usually the conditions in conventional experiments.

[0050] like Figure 1 As shown, Example 1 of the utility model provides a yarn twist testing device, which is mainly used for testing yarn samples with a length of several meters or more, including a sample traction mechanism, an imaging mechanism 3 and a control unit. The sample traction mechanism, the imaging mechanism 3 and the control unit are connected by signal to realize automatic acquisition of the appearance image of the yarn sample and calculation of the twist.

[0051] The sample pulling mechanism includes a front roller assembly 1 and a rear roller assembly 2. The yarn sample 5 is fed in through the front roller assembly 1 and pulled out by the rear roller assembly 2. The speed difference between the front roller assembly 1 and the rear roller assembly 2 allows the yarn sample 5 to run at a certain speed and tension. The appearance image of the yarn sample 5 is obtained at an adapted frequency through the imaging mechanism 3 to ensure that the imaging features are not missed or overlapped. Among them, the roller assembly is a prior art and will not be described in detail in the utility model.

[0052] The imaging mechanism 3 is arranged between the front roller assembly 1 and the rear roller assembly 2, and is used to obtain the appearance image of the yarn sample, including a photographing component 3-2 and a light source 3-3 arranged opposite to the photographing component 3-2. In specific implementation, the photographing component 3-2 and the light source 3-3 are installed in the housing 3-1, and a through hole is provided on the housing 3-1 for the yarn sample 5 to pass through. The photographing component 3-2 can be a camera, and the photographing frequency of the photographing component 3-2 is set according to the running speed of the yarn sample 5.

[0053] The control unit includes a host computer and a slave computer. The host computer can be a computer for human-computer interaction, image processing, data calculation and storage; the slave computer uses a single-chip microcomputer or a microcontroller to control the movement of each mechanism, thereby realizing the automatic test of yarn twist. The control unit obtains the number of peaks or troughs of the yarn appearance profile based on the appearance image of the yarn sample obtained by the imaging mechanism, and obtains the twist of the yarn sample.

[0054] In order to facilitate the control of the tension of the yarn and improve the accuracy of the test, a tension sensor mechanism 4 connected to the control unit signal is also provided, which is arranged between the front roller assembly 1 and the imaging mechanism 3, and is used to measure the tension value of the yarn sample 5. The control unit adjusts the speed difference between the front roller assembly 1 and the rear roller assembly 2 according to the tension measured by the tension sensor mechanism 4. Among them, the tension sensor mechanism 4 adopts a tensioner in the prior art, and the utility model will not be repeated.

[0055] The test method of the above test device is:

[0056] The control unit obtains a value of the thickness change of the appearance of the yarn sample according to the appearance image of the yarn sample, and calculates a period of the thickness fluctuation of the appearance profile according to the obtained value;

[0057] Find the extreme values ​​of the size of the alternating thick and thin changes within a cycle of contour appearance change, that is, the peak value H and the trough value L (such as Figure 3 shown);

[0058] Continue to calculate the extreme values ​​in each remaining fluctuation cycle, and the obtained sample image can be converted into a series of arrays H1, L1, H2, L2...H with adjacent extreme values ​​of coarse and fine sizes alternating. N , L N , where N is the number of peaks or troughs per unit length of the yarn sample, then the twist of the yarn sample T = (N-1) / a, where a is the ratio of the number of peaks or troughs to the twist.

[0059] The a value of the same yarn sample is a fixed value. The calculation process of the above a value is: the twist of the yarn sample measured by a traditional twist meter is T1, then the ratio a=(N-1) / T1. The accurate ratio a can be obtained through multiple comparative tests and calculations. For example, a two-ply twisted yarn sample has an n value of 960 per meter after testing, and its ratio a is 2, then the twist of the two-ply twisted yarn is T=(N-1) / a=479.5 twists / meter.

[0060] The control unit calculates the twist uniformity index according to the pitch value between adjacent peaks or adjacent troughs:

[0061]

[0062] Among them, X i Represents each pitch value, represents the average pitch, n represents the number of measured pitches, S represents the standard deviation, and CV represents the unevenness coefficient. The smaller the values ​​of the standard deviation S and the unevenness coefficient CV, the better the twist uniformity.

[0063] like Figure 2 As shown, it is a schematic diagram of the structure of Example 2 of the utility model, which provides a yarn twist testing device, which is used for testing segment yarn samples. The length of the yarn sample 5 is usually within 1 meter. It includes a sample fixing mechanism, an imaging mechanism 3, a moving mechanism and a control unit. The imaging mechanism 3 and the moving mechanism are connected to the control unit by signal to realize automatic acquisition of the appearance image of the yarn sample 5 and calculation of the twist.

[0064] The sample fixing mechanism is used to fix the segmented yarn sample 5, and includes a fixed clamping assembly 6 connected to one end of the yarn sample 5, and a sliding clamping assembly connected to the other end of the yarn sample 5. One end of the yarn sample 5 is fixed by the fixed clamping assembly 6, and the sliding clamping assembly can adjust the tension of the yarn sample 5.

[0065] The fixed clamping assembly 6 is installed on the frame 18 and clamps one end of the yarn sample 5. The sliding clamping assembly includes a sliding clamping component 7 connected to the yarn sample 5, a tension weight 8 connected to the sliding clamping component 7, and a first guide rail component. The sliding clamping component 7 is slidably connected to the frame 18 via the first guide rail component, and the tension weight 8 is connected to the sliding clamping component 7 via a draw rope 9. By adjusting the weight of the tension weight 8, the tension of the tension weight 8 on the yarn sample 5 can be adjusted, thereby adjusting the tension of the yarn sample 5.

[0066] Among them, the first guide rail component includes a first guide rail 9 installed on the frame 18 and a first slider 10 slidably connected to the first guide rail 9, and the sliding clamping component 7 is fixedly connected to the first slider 1O, so that the sliding clamping component 7 can slide along the first guide rail 9 driven by the tension weight 8.

[0067] In order to improve the stability of the structure, a pulley assembly is also provided on the frame 18, and the pull rope 19 is supported on the pulley assembly. Specifically, the pulley assembly includes a support 11 and a pulley 12 rotatably arranged on the support 11. The pull rope 19 passes around the pulley 12 and is connected to the sliding clamping component 7.

[0068] The imaging mechanism 3 is used to obtain the appearance image of the yarn sample 5, and includes a camera component 3-2 and a light source 3-3 arranged opposite to the camera component 3-2. In specific implementation, the camera component 3-2 and the light source 3-3 are installed in the housing 3-1, and a through hole is provided on the housing 3-1 for the yarn sample 5 to pass through. The camera component 3-2 can be a camera, and the camera frequency of the camera component 3-2 is set by the operating speed of the imaging mechanism 3.

[0069] The moving mechanism is transmission-connected with the imaging mechanism 3 to drive the imaging mechanism 3 to move along the length direction of the yarn sample 5, and comprises a driving motor 13 and a screw assembly transmission-connected with the driving motor 13. The imaging mechanism 3 is transmission-connected with the screw assembly.

[0070] Among them, the screw rod assembly includes a screw rod 14 and a sliding block 15 threadedly connected to the screw rod 14, the housing 3-1 of the imaging mechanism 3 is fixedly connected to the sliding block 15, the screw rod 14 is supported on the frame 18 via two bearing seats (not shown), and one axial end of the screw rod 14 is transmission-connected to the drive motor 13. The drive motor 13 drives the screw rod 14 to rotate, so as to drive the sliding block 15 to move axially along the screw rod 14, thereby driving the imaging mechanism 3 to move along the length direction of the yarn sample 5 to obtain the appearance image of the yarn sample 5.

[0071] The sliding block 15 is slidably connected to the frame 18 via the second rail component to improve the stability of the movement of the imaging mechanism 3. The second rail component includes a second rail 16 mounted on the frame 18 and a second slider 17 slidably matched with the second rail 16. The sliding block 15 is fixedly connected to the second slider 17.

[0072] In order to facilitate the measurement of the tension of the yarn sample 5, a tension sensor mechanism 4 is also included which is connected to the control unit signal and is arranged between the sliding clamping assembly and the imaging mechanism 3. The tension of the yarn sample 5 is measured by the tension sensor mechanism 4, and then the tension of the yarn sample 5 is adjusted by adjusting the tension weight 8. The tension sensor mechanism 4 can adopt a tensioner in the prior art, which will not be described in detail in the present utility model.

[0073] The method for testing the twist of the yarn sample in this embodiment is the same as that in Embodiment 1, and the present invention will not repeat it any more.

[0074] In summary, the twist testing device and the testing method can realize the rapid determination of the twist of the yarn sample, and have high stability, good data repeatability and high accuracy of the test results during the test, which reduces the labor intensity and improves the production efficiency.

[0075] The above examples are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A yarn twist testing device, characterized in that: include: A sample pulling mechanism, comprising a front roller assembly and a rear roller assembly, wherein the yarn sample is fed in through the front roller assembly and pulled out by the rear roller assembly; An imaging mechanism, which is arranged between the front roller assembly and the rear roller assembly and is used to obtain an appearance image of the yarn sample, and includes a photographing component and a light source arranged opposite to the photographing component; The control unit is connected to the sample traction mechanism and the imaging mechanism by signal. The control unit obtains the number of crests or troughs of the yarn appearance profile according to the appearance image of the yarn sample obtained by the imaging mechanism to obtain the twist of the yarn sample.

2. The yarn twist testing device according to claim 1, characterized in that: It also includes a tension sensor mechanism connected to the control unit signal, which is arranged between the front roller assembly and the imaging mechanism and is used to measure the tension value of the yarn sample. The control unit adjusts the speed difference between the front roller assembly and the rear roller assembly according to the tension measured by the tension sensor mechanism.

3. Yarn twist testing device, characterized in that: include: A sample fixing mechanism, which is used to fix a segment of a yarn sample, comprising a fixed clamping assembly connected to one end of the yarn sample, and a sliding clamping assembly connected to the other end of the yarn sample; An imaging mechanism, which is used to obtain an appearance image of the yarn sample, comprising a photographing component and a light source arranged opposite to the photographing component; A moving mechanism, which is transmission-connected with the imaging mechanism and is used to drive the imaging mechanism to move along the length direction of the yarn sample; The control unit is connected to the imaging mechanism and the moving mechanism by signal. The control unit obtains the number of crests or troughs of the yarn appearance profile according to the appearance image of the yarn sample obtained by the imaging mechanism, and obtains the twist of the yarn sample.

4. The yarn twist testing device according to claim 3, characterized in that: The sliding clamping assembly includes a sliding clamping component connected to the yarn sample, a tension weight connected to the sliding clamping component, and a first guide rail component. The sliding clamping component is slidably connected to the frame via the first guide rail component, and the tension weight is connected to the sliding clamping component via a pull rope.

5. The yarn twist testing device according to claim 4, characterized in that: The frame is also provided with a pulley assembly, and the pull rope is supported on the pulley assembly.

6. The yarn twist testing device according to claim 3, characterized in that: The moving mechanism comprises a driving motor and a screw assembly drivingly connected to the driving motor, and the imaging mechanism is drivingly connected to the screw assembly.

7. The yarn twist testing device according to claim 6, characterized in that: The screw assembly comprises a screw and a sliding block threadably connected to the screw, the imaging mechanism is fixedly connected to the sliding block, and the sliding block is slidably connected to the frame via a second guide rail component.

8. The yarn twist testing device according to claim 7, characterized in that: It also includes a tension sensor mechanism connected to the control unit signal, which is arranged between the sliding clamping assembly and the imaging mechanism and is used to measure the tension value of the yarn sample.

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