Physical simulation device for spinning crochet needle of circular knitting machine and simulation method thereof

Abstract

The invention relates to the technical field of textile machinery part manufacturing, in particular to a physical simulation device for a textile crochet hook of a circular knitting machine, which comprises a pay-off roller, a take-up roller and a crochet hook fixing support, a crochet hook is vertically arranged on the crochet hook fixing support, and a tension adjusting assembly is arranged at the lower end of the crochet hook. The pulling force of the doubling thread on the crochet hook is controlled through the pulling force adjusting assembly, a reciprocating mechanism is arranged at the upper end of the pay-off roller and comprises an eccentric wheel assembly and a fabric fixing assembly, and the distance between two fixing points for fixing the doubling thread on the fabric fixing assembly is adjustable. The eccentric wheel assembly drives the fabric fixing assembly to do reciprocating variable motion to simulate working conditions; verification test research in anti-fatigue manufacturing of the crochet hook is carried out, the problems of environmental factors and time cost in the actual use process of the crochet hook are effectively solved, theoretical interface research of contact fatigue and abrasion of the spinning crochet hook is facilitated, and a fatigue and abrasion failure mechanism is obtained based on the crochet hook under different manufacturing conditions.

Description

Technical Field

[0001] The invention relates to the technical field of textile machinery parts manufacturing, in particular to a physical simulation device and a simulation method of a circular knitting machine textile crochet needle. Background Art

[0002] Textile crochet hooks are key components of precision textile equipment such as single- and double-sided large circular machines, small circular machines, rib machines, computer jacquard machines, high-precision single- and double-sided spandex machines, etc. A Chinese invention patent with application announcement number CN117309658A discloses a textile crochet hook friction and wear measurement device and method, including a first spool and a second spool, which can provide accurate test data for the textile industry, so as to control the use of textile crochet hooks, replace the crochet hooks in time at the appropriate time, avoid sudden damage to the crochet hooks, and effectively avoid a major impact on production.

[0003] However, the inventors found that in the actual simulation process, the crochet hook is only tested by the tension adjustment roller during the test, and the fatigue and wear state of the crochet hook under different manufacturing conditions cannot be tested. Summary of the invention

[0004] The purpose of the present invention is to address the deficiencies of the prior art. By setting up a reciprocating mechanism, the eccentric wheel assembly drives the fabric fixing assembly to perform reciprocating variable speed motion to simulate the working condition, thereby effectively solving the problems of environmental factors and the time cost of the actual use of the crochet hook, and contributing to the theoretical interface research of contact fatigue and wear of textile crochet hooks. Based on the crochet hooks under different manufacturing conditions, the failure mechanism of fatigue and wear is obtained.

[0005] In view of the above technical problems, the technical solutions adopted by the present invention are as follows:

[0006] A physical simulation device for a large circular knitting machine textile crochet hook comprises a pay-off roller, a take-up roller and a hook fixing bracket, a hook is vertically arranged on the hook fixing bracket, a tension adjustment component is arranged at the lower end of the hook, and the tension of the spinning thread on the hook is controlled by the tension adjustment component, a reciprocating mechanism is arranged at the upper end of the pay-off roller, and the reciprocating mechanism comprises an eccentric wheel component and a fabric fixing component, the distance between two fixed points of the spinning thread on the fabric fixing component is adjustable, and the fabric fixing component is driven by the eccentric wheel component to perform reciprocating variable speed motion to simulate working conditions.

[0007] Preferably, the eccentric wheel assembly comprises a fixed rod, an eccentric wheel rotatably disposed on the fixed rod, and a connecting piece rotatably disposed on the eccentric wheel, the fixed rod and the connecting piece are adjustable in length, and the eccentric wheel is provided with a plurality of adjustment holes.

[0008] As a preference, the fabric fixing assembly comprises a sliding frame, a fabric fixer a slidably disposed at a left end portion of the sliding frame, and a fabric fixer b slidably disposed at a right end portion of the sliding frame.

[0009] As a preference, the yarns on the pay-off roller and the take-up roller are connected to fabric holder a and fabric holder b respectively.

[0010] As a preference, the tension adjustment assembly comprises a tension adjuster, an adjustment knob arranged at a front end of the tension adjuster, and a spring arranged at an upper end of the tension adjuster.

[0011] As a preference, the crochet hook is provided with a stress sensor and a temperature sensor.

[0012] As another preferred embodiment, a positive wire and a negative wire are welded on the hook needle.

[0013] According to a simulation method of a physical simulation device for a large circular knitting machine textile crochet hook, a physical simulation device for a large circular knitting machine textile crochet hook is used, comprising the following steps:

[0014] a preparation step, by the fabric fixture a and fabric fixture b to install the yarn fixed, by welding the positive wire and the negative wire welding device set on the hook;

[0015] b. Installation process: fix the hook by the hook fixing bracket, tighten the yarn with the hook head, adjust the tension of the spring by adjusting the adjustment knob at the front end of the tension regulator, thereby controlling the tension of the yarn on the hook, install the stress sensor and the temperature sensor on the hook, and control the hook temperature;

[0016] c. Simulate the test process, by setting the motion parameters, start the eccentric wheel, drive the sliding frame to do left and right reciprocating motion through the connecting parts, monitor the physical simulation process in real time and adapt and adjust, and obtain the test friction force or friction coefficient related data after the test is completed;

[0017] d. Data evaluation process, evaluation of friction coefficient, surface integrity evaluation, the surface integrity evaluation includes wear depth-number curve, depth-load curve, wear analysis of hook wear, scanning electron microscope analysis of hook wear parts, wear mechanism analysis, the wear mechanism analysis includes surface phase structure, surface morphology, wear mechanism, the wear mechanism includes adhesive wear, abrasive wear, fatigue relief, etc.

[0018] Beneficial effects of the present invention:

[0019] 1. The present invention simulates working conditions to test the service life or failure of the manufactured crochet hooks or corresponding crochet hook materials under the same working environment.

[0020] 2. The present invention conducts verification test research in the anti-fatigue manufacturing of crochet hooks, which effectively solves the environmental factors and the time cost problem of the actual use of crochet hooks.

[0021] 3. In the present invention, physical simulation is carried out to obtain the life parameters of key components of textile crochet circular knitting machines through equivalent accelerated tests, guide the practical application of crochet hooks of circular knitting machines and other equipment, contribute to the theoretical interface research of contact fatigue and wear of textile crochet hooks, and obtain the failure mechanism of fatigue and wear based on crochet hooks under different manufacturing conditions.

[0022] In summary, the device has the advantage of being helpful for theoretical interface research on contact fatigue and wear of textile crochet hooks, and is particularly suitable for the field of textile machinery parts manufacturing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the structure of the physical simulation device of the circular knitting machine crochet needle;

[0025] Figure 2 It is a front view of a physical simulation device for a circular knitting machine crochet hook;

[0026] Figure 3 is a structural schematic diagram of a fabric fixing assembly;

[0027] Figure 4 It is the working state diagram of the physical simulation device of the circular knitting machine crochet needle;

[0028] Figure 5 It is the working state diagram of the reciprocating mechanism;

[0029] Figure 6 It is the process flow chart of the physical simulation device of circular knitting crochet;

[0030] Figure 7 Figure 2 shows the friction and wear test scheme under different loads.

[0031] Figure 8 Figure 2 is a diagram of the friction and wear test plan at different speeds.

[0032] 1. Pay-off roller; 2. Reciprocating mechanism; 3. Hook fixing bracket; 4. Hook; 5. Tension adjustment assembly; 6. Take-up roller; 7. Spinning thread; 8. Stress sensor; 9. Temperature sensor; 10. Positive wire; 20. Negative wire; 21. Eccentric wheel assembly; 22. Fabric fixing assembly; 51. Tension adjuster; 52. Adjustment knob; 53. Spring; 211. Fixing rod; 212. Eccentric wheel; 213. Connector; 221. Sliding frame; 222. Fabric fixer a; 223. Fabric fixer b. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings.

[0034] Embodiment 1

[0035] like Figures 1 to 6 As shown, it includes a pay-off roller 1, a take-up roller 6 and a hook fixing bracket 3, a hook 4 is vertically arranged on the hook fixing bracket 3, a tension adjustment component 5 is arranged at the lower end of the hook 4, and the tension of the spinning line 7 on the hook 4 is controlled by the tension adjustment component 5, and a reciprocating mechanism 2 is arranged at the upper end of the pay-off roller 1, and the reciprocating mechanism 2 includes an eccentric wheel component 21 and a fabric fixing component 22, and the distance between the two fixed points of the spinning line 7 on the fabric fixing component 22 is adjustable, and the fabric fixing component 22 is driven by the eccentric wheel component 21 to perform reciprocating speed change motion to simulate the working condition.

[0036] It is worth mentioning here that by setting up a reciprocating mechanism 2, the eccentric wheel assembly 21 drives the fabric fixing assembly 22 to perform reciprocating motion to simulate the working condition, which effectively solves the environmental factors and the time cost problem of the actual use of the crochet hook 4, and contributes to the theoretical interface research of contact fatigue and wear of the textile crochet hook 4. Based on the crochet hook 4 under different manufacturing conditions, the failure mechanism of fatigue and wear is obtained.

[0037] like Figure 2 As shown, the eccentric wheel assembly 21 includes a fixed rod 211, an eccentric wheel 212 rotatably disposed on the fixed rod 211, and a connecting member 213 rotatably disposed on the eccentric wheel 212. The lengths of the fixed rod 211 and the connecting member 213 are adjustable, and the eccentric wheel 212 is provided with a plurality of adjustment holes.

[0038] In this example, the fabric fixing assembly 22 is driven by the eccentric wheel 212 to perform reciprocating variable speed motion, and vibration is generated during the motion, so that the service life or failure of the crochet hook 4 under different working environments can be tested; by adjusting the length of the fixing rod 211 and the connecting piece 213, the service life or failure of the crochet hook 4 under different amplitudes can be simulated; by replacing the adjustment hole, the service life or failure of the crochet hook 4 under different amplitudes can also be simulated.

[0039] like Figure 3 As shown, the fabric fixing assembly 22 includes a sliding frame 221 , a fabric fixing device a222 slidably disposed at the left end of the sliding frame 221 , and a fabric fixing device b223 slidably disposed at the right end of the sliding frame 221 .

[0040] In this example, the sliding frame 221 is fixed on the experimental table, and the thread and the thread position can be adjusted by moving the fabric fixture a222 and the fabric fixture b223; the spinning thread wrap angle on the crochet hook 4 can be adjusted by the fabric fixture a222 and the fabric fixture b223, and the service life or failure of the crochet hook 4 under different working conditions can be simulated by different wrap angles.

[0041] like Figure 1 , Figure 2 As shown, the yarn 7 on the pay-off roller 1 and the take-up roller 6 are connected to the fabric fixer a222 and the fabric fixer b223 respectively.

[0042] like Figure 2 As shown, the tension adjustment assembly 5 includes a tension adjuster 51 , an adjustment knob 52 arranged at the front end of the tension adjuster 51 , and a spring 53 arranged at the upper end of the tension adjuster 51 .

[0043] In this example, an insulating material is provided on the spring 53 .

[0044] like Figure 1 As shown, the hook needle 4 is provided with a stress sensor 8 and a temperature sensor 9 .

[0045] like Figure 2 As shown, a positive wire 10 and a negative wire 20 are welded on the hook needle 4 .

[0046] In this example, factors such as ambient temperature and frictional heat generated by the hook 4 are taken into consideration, a positive wire 10 and a negative wire 20 are provided, and resistance heating and a temperature sensor 9 are added to perform real-time ambient temperature simulation.

[0047] Embodiment 2

[0048] like Figures 1 to 6 As shown, a simulation method of a physical simulation device for a large circular knitting machine crochet needle, using a physical simulation device for a large circular knitting machine crochet needle, comprises the following steps:

[0049] a preparation step, by the fabric fixture a222 and the fabric fixture b223 to install and fix the yarn 7, by welding the positive wire 10 and the negative wire 20 are welded to the hook 4;

[0050] b. Installation process: fix the hook 4 by the hook fixing bracket 3, tighten the yarn 7 with the head of the hook 4, adjust the tension of the spring 53 by adjusting the adjustment knob 52 at the front end of the tension regulator 51, thereby controlling the tension of the yarn 7 on the hook 4, install the stress sensor 8 and the temperature sensor 9 on the hook 4, and control the temperature of the hook 4;

[0051] c. Simulation test process, by setting the motion parameters, starting the eccentric wheel 212, driving the sliding frame 221 to do left and right reciprocating motion through the connecting member 213, real-time monitoring and adaptive adjustment of the physical simulation process, the test is completed, and the test friction force or friction coefficient related data is obtained;

[0052] d. Data evaluation process, evaluation of friction coefficient, surface integrity evaluation, the surface integrity evaluation includes wear depth-number curve, depth-load curve, wear analysis of hook wear, scanning electron microscope analysis of hook wear parts, wear mechanism analysis, the wear mechanism analysis includes surface phase structure, surface morphology, wear mechanism, the wear mechanism includes adhesive wear, abrasive wear, fatigue relief, etc.

[0053] Embodiment 3

[0054] During the weaving process of the crochet hook 4, the needle damage of the yarn is taken into consideration, so the commonly used yarn FDYFulldrawnyarn, that is, fully drawn yarn of polyester and nylon, as well as polyester, nylon, nylon, etc. can be selected in the physical simulator; considering factors such as ambient temperature and friction heat generated by the crochet hook 4, resistance heating and temperature sensor 9 are added to perform real-time ambient temperature simulation; the parameters of the physical simulation equipment are similar to the actual working conditions of the circular knitting crochet hook 4; the working environment also includes the appropriate addition of lubricating oil to the crochet hook 4; the working environment also includes humidity control; the crochet hook 4 can be in the shape of an actual crochet hook 4 or a sample rod of the same thickness for easy processing and testing.

[0055] A. Test method: Basic requirements:

[0056] Load: 0-50N

[0057] Reciprocating frequency: 0-50Hz

[0058] Single contact stroke between spinning thread and hook: 0-40mm

[0059] Hook temperature: 0-100℃

[0060] Crochet hook roughness: Ra0.4 Actual manufactured crochet hook parameters

[0061] Crochet hook material: T10 steel

[0062] Fabric materials: Yarn FDY, polyester, nylon, fishing net line, synthetic fiber / hemp, cotton, ramie and other fabrics

[0063] B. Selection of experimental parameters:

[0064] According to the actual working parameter range of textile circular knitting machine, it is adopted through experiments.

[0065] 1. Curve trend diagram of the total wear of the hook material changing with load under different load conditions.

[0066] Fixed frequency: 1Hz

[0067] Select the number of cycles: 0-5x1035x103—1x1041x104—1x105

[0068] Available loads: 5N, 10N, 25N

[0069] Hook temperature control: 40±2℃

[0070] Specific parameters such as Figure 6 shown.

[0071] 2. Curve trend of total wear of hook material changing with speed at different test speeds

[0072] Fixed load: 5N

[0073] Stroke 0.04m,

[0074] Hook temperature control: 40±2℃

[0075] Select the number of cycles: 0-5x1035x103—1x1041x104—1x105

[0076] Selectable frequency: 0.5Hz, 1Hz, 5Hz, 10Hz

[0077] Specific parameters such as Figure 7 shown.

[0078] C. Equivalent accelerated test selection:

[0079] The method of simulating fatigue damage after long-term use by an accelerated test method is to destroy the crochet hook by an accelerated test to simulate fatigue damage after long-term use.

[0080] Due to the actual textile process, relevant test parameters such as load tension, frequency and linear speed take too long to perform life fatigue tests. Therefore, in the actual physical simulation process, without affecting the test results, an equivalent accelerated test is used, such as using 10 times the load / frequency value for testing, which greatly shortens the test time.

[0081] The experimental process needs to be carried out 3-5 times to achieve accurate data collection and analysis.

[0082] Different hook equivalent acceleration test standards differ in test methods, test requirements and test indicators. The selection of appropriate test standards requires consideration of factors such as the actual application environment and application scope.

[0083] The working process is as follows:

[0084] The yarn 7 is installed and fixed by the fabric fixer a222 and the fabric fixer b223, and the positive wire 10 and the negative wire 20 are welded and set on the hook 4 by the welding device;

[0085] The hook 4 is fixed by the hook fixing bracket 3, the head of the hook 4 tightens the yarn 7, and the spring 53 is adjusted to be tight by adjusting the adjusting knob 52 at the front end of the tension regulator 51, so as to control the tension of the yarn 7 on the hook 4, and the stress sensor 8 and the temperature sensor 9 are installed on the hook 4 to control the temperature of the hook 4;

[0086] By setting the motion parameters, the eccentric wheel 212 is started, and the sliding frame 221 is driven to make left and right reciprocating motion through the connecting piece 213. The physical simulation process is monitored in real time and adjusted adaptively. After the test is completed, the test friction force or friction coefficient related data is obtained, the friction coefficient is evaluated, the surface integrity is evaluated, the wear amount of the hook 4 is analyzed, the worn parts of the hook are analyzed by scanning electron microscopy, and the wear mechanism is analyzed.

[0087] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art under the technical guidance of the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A physical simulation device for a large circular knitting machine crochet needle, comprising a pay-off roller (1), a take-up roller (6) and a crochet needle fixing bracket (3), wherein a crochet needle (4) is vertically arranged on the crochet needle fixing bracket (3), and a tension adjustment component (5) is arranged at the lower end of the crochet needle (4), and the tension of the spinning thread (7) on the crochet needle (4) is controlled by the tension adjustment component (5), characterized in that: A reciprocating mechanism (2) is provided at the upper end of the pay-off roller (1), and the reciprocating mechanism (2) comprises an eccentric wheel assembly (21) and a fabric fixing assembly (22). The distance between two fixing points of the fabric fixing assembly (22) for fixing the spinning thread (7) is adjustable, and the eccentric wheel assembly (21) drives the fabric fixing assembly (22) to perform reciprocating variable speed motion to simulate working conditions.

2. A physical simulation device for circular knitting crochet according to claim 1, characterized in that: The eccentric wheel assembly (21) comprises a fixing rod (211), an eccentric wheel (212) rotatably arranged on the fixing rod (211), and a connecting piece (213) rotatably arranged on the eccentric wheel (212); the fixing rod (211) and the connecting piece (213) are adjustable in length, and the eccentric wheel (212) is provided with a plurality of adjustment holes.

3. A physical simulation device for circular knitting crochet according to claim 2, characterized in that: The fabric fixing assembly (22) comprises a sliding frame (221), a fabric fixing device a (222) slidably arranged at the left end of the sliding frame (221), and a fabric fixing device b (223) slidably arranged at the right end of the sliding frame (221).

4. A physical simulation device for circular knitting crochet according to claim 3, characterized in that: The spinning threads (7) on the pay-off roller (1) and the take-up roller (6) are connected to the fabric fixer a (222) and the fabric fixer b (223) respectively.

5. The physical simulation device for circular knitting crochet according to claim 1, characterized in that: The tension adjustment assembly (5) comprises a tension adjuster (51), an adjustment knob (52) arranged at the front end of the tension adjuster (51), and a spring (53) arranged at the upper end of the tension adjuster (51).

6. A physical simulation device for circular knitting crochet according to claim 4, characterized in that: The hook needle (4) is provided with a stress sensor (8) and a temperature sensor (9).

7. The physical simulation device for circular knitting crochet according to claim 1, characterized in that: A positive wire (10) and a negative wire (20) are welded on the hook needle (4).

8. The simulation method of the physical simulation device of a circular knitting machine crochet needle according to claim 1, using the physical simulation device of a circular knitting machine crochet needle according to claim 1, comprising the following steps: a preparation step, by the fabric fixture a (222) and the fabric fixture b (223) to install and fix the yarn 7, by welding the positive wire (10) and the negative wire (20) are welded and set on the hook (4); b. Installation process, fixing the hook (4) by means of the hook fixing bracket (3), tightening the yarn (7) with the head of the hook (4), adjusting the tension of the spring (53) by adjusting the adjustment knob (52) at the front end of the tension regulator (51), thereby controlling the tension of the yarn (7) on the hook (4), installing the stress sensor (8) and the temperature sensor (9) on the hook (4), and controlling the temperature of the hook (4); c. Simulation test process, by setting the motion parameters, starting the eccentric wheel (212), driving the sliding frame (221) to do left and right reciprocating motion through the connecting member (213), real-time monitoring and adaptive adjustment of the physical simulation process, the test is completed, and the test friction force or friction coefficient related data is obtained; d. Data evaluation process, evaluating the friction coefficient, surface integrity evaluation, the surface integrity evaluation includes wear depth-frequency curve, depth-load curve, wear analysis of the hook (4), scanning electron microscope analysis of the hook wear part, wear mechanism analysis, the wear mechanism analysis includes surface phase structure, surface morphology, wear mechanism, the wear mechanism includes adhesive wear, abrasive wear, fatigue relief, etc.

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