Intelligent beam fiber strength tester and application method

Abstract

The present application relates to the technical field of cotton fiber detection. A kind of intelligent beam fiber strength tester, including cabinet, industrial computer, sliding table module is provided in cabinet, sectional material frame, air cylinder, beam fiber clamping mechanism, stepper motor, lever type pull rod, force sensor, displacement sensor, resistance detection plate, A / D acquisition conversion module;The application method of the tester, steps include: under normal environmental conditions, beam fiber clamping mechanism clamps fiber sample, obtains moisture regain R by resistance moisture regain conversion program conversion;Stepper motor drives lever type pull rod to stretch sample, data is made into the tensile curve F (e) of beam fiber sample-e by industrial computer, and machine learning model predicts the corrected breaking strength value and elongation rate.The present application is simple and reasonable in structure, can realize the quick and accurate measurement of cotton beam fiber breaking strength value and breaking elongation rate under different humidity conditions in normal environment, is high in informatization degree, economic and practical, and improves the accuracy of test result.

Description

TECHNICAL FIELD

[0001] The application relates to an intelligent bundle fiber strength tester and an application method, in particular to a device and a method for accurately testing the breaking strength and elongation of cotton fibers under different humidity conditions, and belongs to the technical field of cotton fiber detection. BACKGROUND

[0002] China is one of the three largest cotton producing countries in the world, and is also the largest cotton producing and consuming country and the largest cotton importing country. According to the statistical data of 2021, the cotton consumption of China accounts for more than 30% of the global total. As the largest production and consumption market of cotton, the cotton processing enterprises in China annually perform notarized inspection on more than 24 million cotton bales. In the grade inspection of cotton, the strength of cotton fiber is one of the most important inspection indexes. The strength of cotton fiber is determined by the tensile property of cotton fiber, and the breaking specific strength and breaking elongation are two important parameters for evaluating the tensile property of cotton fiber. Researches show that the breaking specific strength and breaking elongation of cotton fiber have a significant influence on the processing quality of cotton and the quality of yarn. Therefore, it is of great significance to realize the rapid and standard testing of the breaking specific strength and breaking elongation of cotton fiber, which is important for improving the breeding and processing quality of cotton.

[0003] There are various classifications of bundle fiber strength testers for measuring the strength parameters of cotton fibers. According to the principle type, the various bundle fiber strength testers can be classified into two categories, i.e. mechanical type and electronic type. According to the different stress modes of cotton fibers in the tensile process, there are three types, i.e. constant rate of elongation (CRE), constant rate of traction (CRT) and constant rate of loading (CRL). According to the principle structure of the strength tester, the bundle fiber strength testers can be further divided into pendulum type strength tester, lever type strength tester and electronic type strength tester. The mechanical type bundle fiber strength tester is no longer used for the inspection of cotton in public and commercial inspection due to the reasons such as complicated sample preparation process, high sample preparation requirement, low automation degree, small amount of information and backward technology. According to the relevant standards, the first stretching mode adopted by the electronic type bundle strength tester is constant rate of elongation (CRE).

[0004] The bundle strength tester has been deeply researched at home and abroad. Chinese patent CN109932243A proposed a multifunctional intelligent bundle fiber strength tester and its measurement method and use, but it is not suitable for the rapid measurement of the strength and elongation of cotton fibers. US patent US2706403A (Fiber tester) discloses a bundle fiber strength testing device, which is mechanical type and has a low degree of informatization. Before the popularization of HVI with large capacity, the constant rate of traction type (CRT) strength tester was generally used in China, and the standard adopted was GB / T6101-1985 “Cotton Fiber Breaking Strength Test Method Bundle Fiber Method”, which was abolished in 04, and then the “HVI Cotton Fiber Physical Property Test Method” was formulated based on the American standard ASTM D-5867-1995, which has been published and implemented since 2006.

[0005] At present, the HVI 1000 large capacity cotton tester developed by Uster Company is the mainstream equipment for detecting the breaking strength and elongation at break of cotton, but there are still some deficiencies in the actual use process. According to relevant research, the strength test result of cotton fiber is negatively correlated with the environmental temperature and positively correlated with the humidity. Therefore, in order to ensure the accuracy of the test result, the current national cotton inspection specification requires that the detected cotton sample must be balanced in the balance room for more than 48 hours before being detected by the HVI instrument, and the balance room is a constant temperature and humidity air environment, the temperature is (20±2.0)℃, and the relative humidity is (65±3)%. The processing and inspection of cotton have strong seasonality, and a large amount of inspection work needs to be completed in a short time. Although the balancing step of the temperature and humidity of the cotton sample improves the accuracy, it greatly limits the inspection speed of the instrument. Even if some inspection offices abroad use sealed conveying belts to strengthen the balanced air system, at least 15 minutes are still needed. In addition to affecting the inspection speed of cotton, the method of testing the strength and elongation of the cotton sample by balancing still faces difficulties in ensuring consistency and accuracy. The moisture regain of different varieties or pretreated cotton fibers with dry basis and wet basis is not the same under the same balancing conditions. In other aspects, the fiber slippage and fiber wax residue problems are found in the use process of the HVI 1000 fiber strength test, which reduces the accuracy of the test result of the equipment and causes trouble in maintenance. SUMMARY

[0006] In order to solve the problems proposed in the background art, one of the purposes of the present application is to provide an intelligent bundle fiber strength tester with simple and reasonable structure, which can quickly and accurately measure the breaking strength and elongation of cotton bundle fibers under different humidity conditions. Another purpose of the present application is to provide an application method based on the intelligent bundle fiber strength tester, which has high informationization degree and is economical and practical. The cotton bundle fibers are quickly inspected under normal atmospheric temperature and humidity conditions, and the accuracy of the test result is improved.

[0007] In order to achieve the above purposes, the technical scheme adopted by the present application is as follows:

[0008] An intelligent bundle fiber strength tester, comprising a cabinet, an industrial computer, a sliding table module, a profile frame, an air cylinder, a bundle fiber clamping mechanism, a stepping motor, a lever type pull rod, a force sensor, a displacement sensor, a resistance detection plate, an A / D acquisition conversion module.

[0009] The air cylinder is arranged on the profile rack, and the air cylinder is connected with the bundle fiber clamping mechanism through an air cylinder push rod.

[0010] The power output end of the stepper motor is connected with a screw rod, and the screw rod is threadedly connected with the lower end of the lever type pull rod. The bottom of the profile rack is provided with linear bearings on both sides, and the linear bearings are connected to a group of parallel guide rods.

[0011] The industrial computer contains resistance moisture regain conversion program, bundle fiber breaking strength calculation program, bundle fiber breaking elongation calculation program, breaking strength and elongation machine learning correction model program, and analysis verification program.

[0012] The jaw of the upper jaw and the lower jaw of the bundle fiber clamping mechanism is a wave-shaped clamping surface jaw, and the resistance measuring electrode pieces are positive and negative copper pieces.

[0013] The air cylinder is connected with the profile rack through an adjustable locking seat.

[0014] The center height of the force sensor is consistent with the height of the highest point of the jaw surface of the lower jaw of the bundle fiber clamping mechanism.

[0015] The jaw clamping surface is a wavy clamping surface, the cross-sectional shape of which is mainly composed of tangential connection of three circular arcs, the upper surface of the jaw on the side where the fiber bundle is stretched is an extension of the horizontal plane where the horizontal tangent of the circular arc is located, and the intersection of the extension plane and the vertical end surface on the same side is a rounded corner.

[0016] The intelligent fiber bundle strength tester provided by the application is designed according to the self-locking principle of the eccentric clamp, and cannot be loosened after clamping. The fiber bundle clamping mechanism 1 is connected to one corner end of the eccentric clamp frame 103 through the connecting rod 101, the eccentric clamp frame 103 can rotate around the shaft 102, and after rotating through a certain angle, the upper jaw clamp 104 and the lower jaw clamp 105 at the bottom of the eccentric clamp frame are closed. The adjusting knob 902 of the adjustable locking seat 9 is rotated, so that the air cylinder 3 can move in the vertical direction, the position of the air cylinder 3 is moved, and the angle between the connecting rod 101 and the eccentric clamp frame 103 changes when the jaw is closed.

[0017] A pair of jaws are installed on the upper and lower jaws below the eccentric clamp frame 103 and are connected to the eccentric clamp frame 103 through screws. The jaw closing line is wavy, and the jaws of the upper and lower jaws are wavy curved surfaces. The surface of the upper jaw clamp 104 is provided with a positive electrode piece for measuring resistance, and the lower jaw clamp 105 is provided with a negative electrode piece. The material of the upper jaw clamp is plastic, and the materials of the positive and negative electrode pieces for measuring resistance are pure copper.

[0018] The positive copper piece 201 and the negative copper piece 202 of the resistance measuring electrode piece 2 are respectively installed on the wavy clamping surfaces of the upper jaw clamp 104 and the lower jaw clamp 105.

[0019] The air cylinder 3 and the profile frame 5 are fixed through the adjustable locking seat 9. The fixed position of the air cylinder 3 can be adjusted in the vertical direction. The purpose is to change the angle between the connecting rod 101 and the eccentric clamp frame 103 when the jaw is closed by adjusting the installation position of the air cylinder 3, so as to increase or decrease the holding force.

[0020] The fiber bundle clamping mechanism 1 can rotate around the shaft 102 fixed to the profile frame under the pushing of the air cylinder 3, so that the jaw between the upper and lower jaws is closed, one end of the clamped fiber is clamped, and the electrode piece for measuring fiber resistance is in contact with the fiber to form a closed loop. The electrical signal is transmitted to the resistance detection plate, the measured resistance value is sent to the industrial computer, and the resistance moisture content conversion program is processed to obtain the moisture content of the detected cotton sample.

[0021] The force sensor 7 is characterized in that the structure is S-shaped, installed between the profile frame 5 and the lever type pull rod 12, and the connecting piece of the force sensor 7 and the profile frame 5 and the lever type pull rod 12 is a rotatable swing rod 10. The center point of the force sensor 7 and the highest point on the surface of the lower jaw clamp 105 are on the same horizontal plane, so as to ensure that the direction of the force suffered by the fiber bundle during stretching is always on the same straight line.

[0022] The bundle fiber clamping mechanism 1 is installed on the fixed profile frame 5, and the profile frame 5 is connected between the two guide rods 11 through the linear bearing 4, and under the driving of the stepping motor 6, the fiber bundle clamped by the other fixed clamp head is stretched at a constant speed. In this process, the real-time tension of the sample fiber bundle is converted from a non-electric quantity to a measurable electric quantity by the S-shaped force sensor 7, and the analog electric quantity measured by the force sensor is sampled by the A / D acquisition conversion module to become a digital signal. The real-time elongation of the fiber bundle during the stretching process is measured by the number of steps of the stepping motor 6 and the pull rope type displacement sensor 8 installed on one side of the profile frame 5.

[0023] The application method of the intelligent bundle fiber strength tester mainly includes the following steps:

[0024] Step one: prepare the intelligent bundle fiber strength tester, under normal atmospheric temperature and humidity environment conditions, clamp the bundle fiber sample through the jaw clamping of the upper jaw clamp and the lower jaw clamp, the resistance detection plate detects the size of the resistance value, and the resistance value is sent to the industrial computer, and after conversion by the resistance moisture regain conversion program, the current bundle fiber sample moisture regain R is obtained;

[0025] Step two: the stepping motor drives the lever type pull rod to move and stretch the bundle fiber sample until the fiber is completely broken off, and the stepping motor stops working; during the stretching process, the real-time force and elongation change signal acting on the bundle fiber sample are captured by the A / D acquisition conversion module and stored in the industrial computer memory, and after being processed by the bundle fiber breaking strength calculation program and the bundle fiber breaking elongation calculation program in the industrial computer, the stretching curve of the bundle fiber sample is drawn, and the breaking strength value F and the breaking elongation rate C of the bundle fiber sample are recorded;

[0026] Step three: the stretching curve is transformed, and E is a constant value, which represents the integral area of the transformed curve and its horizontal axis, and is the force at the time when the elongation is e;

[0027] Step four: the values of F, C, E and R are sent to the input nodes of the breaking strength and elongation machine learning correction model to obtain a corrected bundle fiber breaking strength value and breaking elongation rate, which is equivalent to the measured breaking strength and elongation rate value of the bundle fiber sample in the equilibrium state.

[0028] The beneficial effects of the present application are:

[0029] The application can obtain the equivalent value of the breaking strength of the bundle fiber sample in the balanced state through the resistance measuring electrode 2, the force sensor 7, the displacement sensor 8 and the industrial computer with the breaking strength and elongation machine learning correction model program on the bundle fiber clamping mechanism 1, so that the cotton to be detected no longer needs to be placed and balanced in the constant temperature and humidity balancing room for at least 48 hours before testing, the testing efficiency is greatly improved, the energy consumption is saved, and the detection of the breaking specific strength of cotton fiber in the cotton purchasing link becomes possible.

[0030] The bundle fiber clamping mechanism composed of the eccentric clamp frame, the connecting rod and the shaft realizes the function of adjusting the clamping force of the jaws and avoids the occurrence of fiber breakage during the stretching process.

[0031] Compared with the prior art, the intelligent bundle fiber strength tester provided by the application has a simple and reasonable structure and can realize rapid and accurate measurement of the breaking strength and elongation rate of cotton bundle fiber under different humidity conditions; the application method of the intelligent bundle fiber strength tester has high informatization degree and is economical and practical, can rapidly test the cotton bundle fiber under normal atmospheric temperature and humidity conditions, and improves the accuracy of the test results. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is an overall structure schematic diagram of the intelligent bundle fiber strength tester in the embodiment.

[0033] Figure 2 It is a top view structure schematic diagram of the intelligent bundle fiber strength tester.

[0034] Figure 3 It is a connection relationship stereogram of the profile frame, the lever type pull rod, the force sensor and the bundle fiber clamping mechanism in the internal structure of the intelligent bundle fiber strength tester, and the dashed arrow in the diagram represents the movement direction.

[0035] Figure 4 It is a stereogram of the bundle fiber clamping mechanism.

[0036] Figure 5 It is a structure schematic diagram of the upper jaw and the lower jaw with the resistance measuring electrode on the surface of the jaw.

[0037] Figure 6 It is a control and data processing flowchart of the intelligent bundle fiber strength tester.

[0038] Figure 7 It is a tensile curve F(e)-e conversion curve schematic diagram.

[0039] Figure 8 It is aFigure 7 Transformed curve diagram.

[0040] Figure 9 The fitting diagram of the relationship between the breaking strength value recorded by the intelligent bundle fiber strength tester and the moisture regain. It can be seen from the fitting diagram that the breaking strength and the moisture regain have good correlation, and on this basis, the machine learning model can better predict and correct.

[0041] In the figure: 0 is a fixed chuck; 1 is a bundle fiber clamping mechanism; 101 is a connecting rod, 102 is a shaft, 103 is an eccentric clamp frame, 104 is an upper jaw clamp, 105 is a lower jaw clamp; 2 is a resistance measuring electrode; 201 is a positive copper sheet, 202 is a negative copper sheet; 3 is an air cylinder; 4 is a linear bearing; 5 is a profile frame; 6 is a stepping motor; 7 is a force sensor; 8 is a displacement sensor; 9 is an adjustable locking seat; 10 is a swing rod; 11 is a guide rod; 12 is a lever type pull rod; 13 is a screw nut; 14 is a cabinet; 15 is a sliding table module; 16 is a control cabinet, 17 is a screw rod, 18 is an air cylinder push rod; 901 is a sliding groove seat, 902 is an adjusting knob, 903 is an air cylinder installation sliding seat, 904 is a rack, and 905 is a sliding groove. DETAILED DESCRIPTION

[0042] The present application will be described in detail below in conjunction with the drawings and specific examples.

[0043] Example 1:

[0044] Referring to the drawings, the technical solution provided by the present embodiment is:

[0045] An intelligent bundle fiber strength tester, comprising a cabinet 14, an industrial computer, the cabinet 14 is provided with a sliding table module 15, a profile frame 5, an air cylinder 3, a bundle fiber clamping mechanism 1, a stepping motor 6, a lever type pull rod 12, a force sensor 7, a displacement sensor 8, a resistance detection plate, an A / D acquisition conversion module;

[0046] The air cylinder 3 is arranged on the profile rack 5, and the air cylinder 3 is connected with the bundle fiber clamping mechanism 1 through an air cylinder push rod 18. The bundle fiber clamping mechanism 1 comprises an eccentric clamp rack 103, an upper jaw clamp 104, a lower jaw clamp 105, a connecting rod 101 and a shaft 102. The eccentric clamp rack 103 is a triangular rack body. The shaft 102 is fixedly connected with the profile rack 5. One corner end of the eccentric clamp rack 103 is hinged with the shaft 102. The upper jaw clamp 104 is fixedly arranged at the lower corner end of the eccentric clamp rack 103. The lower jaw clamp 105 is fixedly arranged on the profile rack 5 and located below the upper jaw clamp 104. One end of the connecting rod 101 is hinged with the third corner end of the eccentric clamp rack 103. The other end of the connecting rod 101 is hinged with the air cylinder push rod 18. A fixed chuck 0 is arranged on the sliding table module 15. The height position of the fixed chuck 0 is matched with the positions of the upper jaw clamp 104 and the lower jaw clamp 105. Measuring resistance poles are arranged at the jaw openings of the upper jaw clamp 104 and the lower jaw clamp 105. The measuring resistance poles are connected with a resistance detection plate through data lines.

[0047] A lead screw 17 is connected with the power output end of the stepping motor 6. The lead screw 17 is threadedly connected with the lower end of the lever type pull rod 12. One end of the force sensor 7 is connected with the upper part of the lever type pull rod 12 through a rotatable swing rod 10. The other end of the force sensor 7 is connected with the profile rack 5 through a rotatable swing rod 10. Linear bearings 4 are arranged on both sides of the bottom of the profile rack 5. The linear bearings 4 are connected with a group of parallel guide rods 11. The parallel guide rods 11 are fixedly connected with a cabinet 14. One side of the linear bearings 4 is connected with a pull rope of a displacement sensor 8. The force sensor 7 is connected with an A / D acquisition conversion module through data lines. The resistance detection plate, the displacement sensor 8 and the A / D acquisition conversion module are connected with an industrial computer through data lines.

[0048] The industrial computer is a control computer comprising a resistance moisture regain conversion program, a bundle fiber breaking strength calculation program, a bundle fiber breaking elongation calculation program, a breaking strength and elongation machine learning correction model program and an analysis verification program.

[0049] The jaw openings of the upper jaw clamp 104 and the lower jaw clamp 105 in the bundle fiber clamping mechanism 1 are wave-shaped clamping surface jaw openings. The measuring resistance poles arranged on the jaw openings are positive copper sheets 201 and negative copper sheets 202 respectively. The jaw clamping surface is a wave-shaped clamping surface. The cross-sectional shape is mainly composed of three tangent circular arcs. The upper surface of the jaw opening on the side where the bundle fiber is stretched is an extension of the horizontal tangent plane of the circular arc. The intersection of the extension plane and the vertical end surface on the same side is a corner, which is a rounded corner.

[0050] The center height of the force sensor is consistent with the height of the highest point of the jaw opening surface of the lower jaw clamp of the bundle fiber clamping mechanism.

[0051] As Figure 4 shown, the bundle fiber clamping mechanism 1, including the connecting rod 101 with the cylinder 3 rotationally connected, the shaft 102 with threaded holes at both ends, the upper jaw 104 and the lower jaw 105. The connecting rod 101 is connected with the eccentric clamp holder 103, which is installed on the shaft 102 and can rotate around the shaft 102. The shaft 102 is installed on the profile holder 5 through screws at both ends. The bottom of the eccentric clamp holder 103 is provided with the upper jaw 104, which is connected with the eccentric clamp holder 103 through a rib-shaped part. The lower jaw 105, which cooperates with the upper jaw 104, is installed at the corresponding position of the profile holder.

[0052] Figure 5 A set of jaw cross-sectional views are given. The positive copper sheet 201 of the resistance electrode 2 is embedded in the surface of the wavy clamping surface of the upper jaw 104. The corresponding negative sheet 202 is on the surface of the lower jaw 105. The positive copper sheet 201 is connected with the positive electrode of the resistance detection plate, and the negative copper sheet 202 is connected with the negative electrode of the detection plate.

[0053] Referring to Figure 3 and Figure 4 , the cylinder push rod 18 is connected through the connecting rod 101 and one corner end of the eccentric clamp holder 103. The installation mode of the cylinder 3 is cantilevered, and the bottom is provided with four threaded holes for fixing the cylinder 3 with the adjustable locking seat 9. When the cylinder 3 works, the push rod moves forward, pushing the eccentric clamp holder 103 to rotate around the shaft 102, and the upper jaw 104 and the lower jaw 105 are closed.

[0054] As Figure 3 shown, a pair of linear bearings 4 are fixed to the bottom of the profile holder 5. The pull rope end of the pull rope type displacement sensor 8 on one side of the profile holder 5 is connected with the linear bearing 4 on the same side through a screw. The linear bearing 4 and the profile holder 5 can slide along the guide rod 11.

[0055] As Figure 3 shown, the force sensor 7 is installed between the profile holder 5 and the pull rod 12. The connecting piece of the force sensor 7 with the profile holder 5 and the lever type pull rod 12 is a rotatable swing rod 10. The center horizontal position of the force sensor 7 and the highest point on the surface of the lower jaw 105 of the clamp holder 103 are on the same horizontal plane. In addition, the force sensor 7 is connected with the A / D acquisition conversion module through a signal transmission line. The signal transmission line is used to transmit the voltage type signal generated by the measurement sensor 7 to the A / D acquisition conversion module. The output shaft of the stepping motor 6 is connected with the lead screw, and the lead screw nut 13 is installed on the lead screw. One end of the lead screw nut 13 is fixed at the corresponding position of the lever type pull rod 12.

[0056] As Figure 2 shown, the resistance detection plate and the A / D acquisition conversion module are placed in the control cabinet 16 below the profile holder 5.

[0057] As Figure 1 shown, the cabinet 14 is provided with a slide module 15, and the slide module 15 is provided with a fixed chuck 0, and the fixed chuck 0 has the same width as the jaws 104 and 105.

[0058] Working principle: when the fixed chuck 0 moves to the corresponding position of the jaw, the industrial computer sends a command, and the controller controls the cylinder 3 to work, the jaw is closed, and the clamping mechanism 1 clamps the fiber bundle, after the resistance value of the sample is measured, the stepping motor 6 works to drive the pull rod 12 to move, the fiber bundle is axially stretched, the force sensor 7 records the force signal during the whole process, and the displacement sensor 8 measures the corresponding displacement during the whole process, until the cotton fiber is broken off. The industrial computer processes the force signal data and the displacement data to obtain the measurement parameters, and thus the strength and elongation test of the sample fiber bundle is completed.

[0059] Example 2:

[0060] Compared with example 1, the difference of the embodiment is that:

[0061] The cylinder 3 is connected with the profile frame 5 through an adjustable locking seat 9, and the structure of the adjustable locking seat 9 comprises a sliding groove seat 901, an adjusting knob 902 and a cylinder mounting sliding seat 903. The sliding groove seat 901 is provided with a sliding groove 905, the cylinder mounting sliding seat 903 is provided with a protruding rack 904, the rack 904 is embedded in the sliding groove 905, and the adjusting knob 902 is arranged on the side wall of the sliding groove 905. The cylinder mounting sliding seat 903 is fixedly connected with the cylinder 3, and the adjusting knob 902 is rotated to drive the cylinder mounting sliding seat 903 and the cylinder 3 to move up and down along the sliding groove 905.

[0062] Example 3:

[0063] An application method of the intelligent fiber bundle strength tester, characterized by mainly comprising the following steps:

[0064] Step 1: prepare the intelligent fiber bundle strength tester, clamp the fiber bundle sample through the jaws of the upper jaw and the lower jaw in a normal atmospheric temperature and humidity environment, contact the resistance detection plate with the fiber bundle sample to form a loop, detect the resistance value, send the resistance value to the industrial computer, convert the resistance value through the resistance moisture regain conversion program to obtain the current moisture regain R of the fiber bundle sample;

[0065] Step 2: The stepper motor drives the lever-type tie rod to move, stretching the fiber bundle sample until the fiber is completely broken, at which point the stepper motor stops working; during the stretching process, the real-time force and elongation change signals acting on the fiber bundle sample are captured by the A / D acquisition and conversion module and stored in the industrial control computer's memory. After the data is processed by the fiber bundle breaking strength calculation program and the fiber bundle breaking elongation calculation program inside the industrial control computer, the stretching curve of the fiber bundle sample is plotted, and the breaking strength value F and breaking elongation C of the fiber bundle sample are recorded.

[0066] Step 3: Transform the stretching curve and calculate that E is a constant value, representing the area of ​​the transformed curve integrated with its horizontal axis, and is the force at the time of elongation e.

[0067] Step 4: Send the values ​​of F, C, E, and R to the input node of the machine learning correction model for breaking strength and elongation to obtain a corrected fiber bundle breaking strength and breaking elongation value, which is equivalent to the breaking strength and elongation value measured by the fiber bundle sample under equilibrium conditions.

[0068] The stretch curve F(e)-e transformation is as follows Figure 7 , Figure 8 As shown, Figure 8 The transformed curve is E, which is the area of ​​the transformed curve integrated with its horizontal axis. The value of E is closely related to the tensile properties of each single fiber that makes up the fiber bundle. Incorporating this parameter into the prediction model can effectively improve the prediction accuracy.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be noted that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An intelligent beam fiber strength tester, comprising a cabinet, an industrial computer, characterized in that The cabinet is provided with a slide module, a profile frame, a cylinder, a fiber bundle clamping mechanism, a stepping motor, a lever pull rod, a force sensor, a displacement sensor, a resistance detection plate, an A / D acquisition conversion module; The cylinder is arranged on the profile frame, and the cylinder is connected with the fiber bundle clamping mechanism through a cylinder push rod; the fiber bundle clamping mechanism comprises an eccentric clamp frame, an upper jaw clamp, a lower jaw clamp, a connecting rod and a shaft; the eccentric clamp frame is a triangular frame body; the shaft is fixedly connected with the profile frame; one corner end of the eccentric clamp frame is hingedly connected with the shaft; the upper jaw clamp is fixedly arranged at the lower corner end of the eccentric clamp frame; the lower jaw clamp is fixedly arranged on the profile frame and located below the upper jaw clamp; one end of the connecting rod is hingedly connected with the third corner end of the eccentric clamp frame; the other end of the connecting rod is hingedly connected with the push rod of the cylinder; the slide module is provided with a fixed chuck, and the height position of the fixed chuck is matched with the positions of the upper jaw clamp and the lower jaw clamp; the jaw openings of the upper jaw clamp and the lower jaw clamp are both provided with resistance measuring pieces, and the resistance measuring pieces are connected with the resistance detection plate through data lines. The power output end of the stepping motor is connected with a lead screw, and the lead screw is threadedly connected with the lower end of the lever pull rod; one end of the force sensor is connected with the upper part of the lever pull rod through a rotatable swing rod, and the other end of the force sensor is connected with the profile frame through a rotatable swing rod; the two sides of the bottom of the profile frame are both provided with linear bearings, and the linear bearings are connected with a group of parallel guide rods; the parallel guide rods are fixedly connected with the cabinet; the linear bearing on one side is connected with a pull rope of the displacement sensor; the force sensor is connected with the A / D acquisition conversion module through data lines; the resistance detection plate, the displacement sensor and the A / D acquisition conversion module are connected with an industrial computer through data lines.

2. The intelligent beam fiber strength tester of claim 1, wherein The industrial computer is a control computer containing a resistance moisture regain conversion program, a fiber bundle breaking strength calculation program, a fiber bundle breaking elongation calculation program, a breaking strength and elongation machine learning correction model program and an analysis verification program.

3. The intelligent beam fiber strength tester according to claim 1 or 2, wherein The jaw openings of the upper jaw clamp and the lower jaw clamp in the fiber bundle clamping mechanism are wave-shaped clamping surfaces matched with each other, and the resistance measuring pieces are positive copper pieces and negative copper pieces respectively.

4. The intelligent beam fiber strength tester according to claim 1 or 2, wherein The cylinder is connected with the profile frame through an adjustable locking seat; the adjustable locking seat comprises a sliding groove seat, an adjusting knob and a cylinder mounting sliding seat; the sliding groove seat is provided with a sliding groove; the cylinder mounting sliding seat is provided with a protruding rack; the rack is embedded in the sliding groove; the adjusting knob is arranged on the side wall of the sliding groove; the cylinder mounting sliding seat is fixedly connected with the cylinder; the adjusting knob is rotated to drive the cylinder mounting sliding seat and the cylinder to move up and down along the sliding groove.

5. The intelligent beam fiber strength tester of claim 3, wherein The cylinder is connected with the profile frame through an adjustable locking seat; the adjustable locking seat comprises a sliding groove seat, an adjusting knob and a cylinder mounting sliding seat; the sliding groove seat is provided with a sliding groove; the cylinder mounting sliding seat is provided with a protruding rack; the rack is embedded in the sliding groove; the adjusting knob is arranged on the side wall of the sliding groove; the cylinder mounting sliding seat is fixedly connected with the cylinder; the adjusting knob is rotated to drive the cylinder mounting sliding seat and the cylinder to move up and down along the sliding groove.

6. The intelligent beam fiber strength tester of claim 5, wherein The center height of the force sensor is consistent with the height of the highest point of the jaw surface of the lower jaw clamp of the bundle fiber clamping mechanism.

7. The intelligent beam fiber strength tester of claim 3, wherein, The jaw clamping surface is a wavy clamping surface, the cross-sectional shape of which is mainly composed of tangent of three circular arcs, the upper surface of the jaw on the side where the bundle fiber is stretched is an extension of the horizontal plane where the horizontal tangent of the circular arc is located, and the corner where the extension plane intersects with the vertical end surface on the same side is a rounded corner.

8. The method of claim 1, wherein the method further comprises: determining a fiber strength of the bundle of fibers based on the measured force. The method mainly comprises the following steps: Step one: prepare the intelligent bundle fiber strength tester, clamp the bundle fiber sample through the jaw of the upper jaw and the lower jaw in the normal atmospheric temperature and humidity environment, form a loop by the contact between the resistance electrode and the bundle fiber sample, detect the resistance value by the resistance detection plate, send the resistance value to the industrial computer, convert the resistance value to the current bundle fiber sample moisture regain R through the resistance moisture regain conversion program; Step two: the stepping motor drives the lever-type pull rod to move and stretch the bundle fiber sample until the fiber is completely broken off, and the stepping motor stops working; during the stretching process, the real-time force and elongation change signal acting on the bundle fiber sample are captured by the A / D acquisition conversion module and stored in the industrial computer memory, and the data are processed by the bundle fiber breaking strength calculation program and the bundle fiber breaking elongation calculation program in the industrial computer to draw the tensile curve F(e)-e of the bundle fiber sample, and record the breaking strength value F and the breaking elongation rate C of the bundle fiber sample; Step three: transform the tensile curve F(e)-e, and calculate E is a constant value, representing the integral area of the transformed curve and its horizontal axis, and F(e) is the force when the elongation is e. Step four: send the values of F, C, E and R to the input nodes of the breaking strength and elongation machine learning correction model to obtain a corrected bundle fiber breaking strength value F' and a breaking elongation rate C', which are equivalent to the measured breaking strength and elongation rate values of the bundle fiber sample in the equilibrium state.

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