A dynamic thermal stress testing device for pre-oriented yarn

Abstract

The present invention relates to a dynamic thermal stress testing device for pre-oriented yarns, comprising a device main body and a tension measuring mechanism; the device main body is a hollow cube structure; the device main body includes side plates and a bottom plate; through holes I and II are provided on the side plates; the tension measuring mechanism includes a measuring wheel, a force measuring connecting rod, a support plate I, a calibration rod, a fulcrum bearing and a force measuring sensor; the fulcrum bearing includes a fixed block and a bearing I; the fixed block is fixed on the bottom plate, and the outer ring of the bearing I is fixed on one side surface of the fixed block; the central axis of the bearing I is perpendicular to the side plate; the support plate I is a rectangular plate, the support plate I is fixedly connected with the inner ring of the bearing I, and the center of the support plate I is located on the central axis of the bearing I; the force measuring connecting rod is perpendicular to the side plate, and the force measuring connecting rod passes through the through hole I and is fixedly connected with the support plate I, so that part of the force measuring connecting rod is located outside the device main body and part of it is located inside the device main body. When testing according to the present invention, no yarn bundle is required for auxiliary linear calibration, and the calibration is more accurate.

Description

Technical Field

[0001] The present invention belongs to the technical field of thermal stress testing, and relates to a dynamic thermal stress testing device for pre-oriented yarns. Background Art

[0002] During the use of the dynamic thermal stress testing device for pre-oriented yarns, it is often necessary to calibrate the force sensor. The force sensor is connected to the measuring wheel of the dynamic thermal stress testing device for pre-oriented yarns, and mainly measures the thermal stress value of the pre-oriented yarn after passing through the heating box and then through the measuring wheel. To ensure the accuracy of calibration, zero calibration and linear calibration are usually required.

[0003] Zero calibration means that by adjusting the output of the force sensor, the reading of the measuring wheel under no load is zero; linear calibration means that according to the applied known standard force and the output of the force sensor, it is checked whether the response of the force sensor is linear. If the output of the force sensor is not proportional to the applied force (i.e., the output signal does not match the actual force), adjustment needs to be made through calibration software or hardware.

[0004] When the dynamic thermal stress testing device for pre-oriented yarns performs linear calibration, a yarn bundle and weights need to be prepared. One end of the yarn bundle is fixed to a fixed roller, as Figure 7 shown. The other end passes vertically downward through the heating box 4, bypasses the measuring wheel 5, then passes upward around the weight wheel 23 and is connected to the weight 24. Through the output of the weight and the force sensor, it is checked whether the response of the force sensor is linear; among them, since the measuring wheel receives an upward force when measuring the thermal stress value in the prior art, and the weight can only give a downward force, the downward force given by the weight can be converted into an upward force through the weight wheel and the yarn bundle. This method of the prior art requires an additional yarn bundle to be prepared for each linear calibration to assist in linear calibration, which makes the linear calibration process complex and time-consuming, and the force on the measuring wheel includes the weight of the weight and a part of the weight of the wire, resulting in a small error.

[0005] The patent with the authorization publication number CN216955428U discloses a heating mechanism and a thermal stress detection mechanism for chemical fiber filaments, and proposes a stress measurement mechanism composed of a zero adjustment mechanism and a tension measurement mechanism. Its working principle is that the drive mechanism motor drives the belt to drive the zero adjustment drum and the zero adjustment outer ring, and changes the positions of the two adjustment parts to switch between the two working states of force value zero adjustment and force value measurement. However, the force value zero adjustment therein is equivalent to zero calibration, and there is no record on how to quickly perform linear calibration.

[0006] Therefore, it is of great significance to study a dynamic thermal stress testing device for pre-oriented yarns to solve the above problems. Summary of the Invention

[0007] The object of the present invention is to solve the problems existing in the prior art and provide a dynamic thermal stress testing device for pre-oriented yarns.

[0008] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0009] A dynamic thermal stress testing device for pre-oriented yarns, the dynamic thermal stress testing device includes a device main body and a tension measuring mechanism; the device main body is a hollow cube structure; the device main body includes side plates and a bottom plate; through hole I and through hole II are provided on the side plates; through hole I and through hole II are respectively used to communicate the inside of the dynamic thermal stress testing device main body with the outside;

[0010] The tension measuring mechanism includes a measuring wheel, a force measuring connecting rod, a support plate I, a calibration rod, a fulcrum bearing and a force measuring sensor;

[0011] The fulcrum bearing includes a fixed block and bearing I; the fixed block is fixed on the bottom plate, and the outer ring of bearing I is fixed on one side of the fixed block; the central axis of bearing I is perpendicular to the side plate;

[0012] Support plate I is a rectangular plate, support plate I is fixedly connected to the inner ring of bearing I, and the center of support plate I is located on the central axis of bearing I;

[0013] The force measuring connecting rod is perpendicular to the side plate, the force measuring connecting rod passes through through hole I and is fixedly connected to support plate I, so that part of the force measuring connecting rod is located outside the device main body and part of it is located inside the device main body;

[0014] The measuring wheel is located outside the device main body and is fixedly connected to the force measuring connecting rod;

[0015] The calibration rod is perpendicular to the side plate, one end of the calibration rod is fixedly connected to support plate I, and the other end passes through through hole II and exposes outside the device main body; the projection of the calibration rod on support plate I and the projection of the force measuring connecting rod on support plate I are centrosymmetric about the center of support plate I;

[0016] When the measuring wheel is subjected to an upward tension, the force measuring connecting rod moves upward and drives support plate I to rotate around the center of support plate I, and at this time the calibration rod moves downward; when the upward tension received by the measuring wheel is within the range of 0 - 500 cN, the force measuring connecting rod does not contact the hole wall of through hole I, the calibration rod does not contact the hole wall of through hole II, and support plate I does not contact the bottom plate;

[0017] The measuring head of the force measuring sensor is fixedly connected to support plate I, and the central axis of the measuring head of the force measuring sensor coincides with the central axis of the calibration rod;

[0018] The measuring wheel, the force-measuring connecting rod, the support plate I, the calibration rod and the pivot bearing in the tension measuring mechanism form a seesaw structure. The upward force received by the measuring wheel can be directly converted into the downward force at the calibration rod. Therefore, when the weight is hung on the calibration rod, the weight of the weight measured by the force-measuring sensor is the upward force received by the measuring wheel, and no tow is required for auxiliary linear calibration, which makes the calibration more accurate. Although the seesaw structure itself also has weight, when performing zero calibration, it has been tared and will not affect the accuracy of the linear calibration result.

[0019] As a preferred technical solution:

[0020] For a pre-oriented yarn dynamic thermal stress testing device as described above, the tension measuring mechanism further includes a support plate II, a bearing II and a fixing rod;

[0021] The outer ring of the bearing II is fixedly connected to the fixing block, and the bearing I and the bearing II are respectively located on two opposite side surfaces of the fixing block; the inner ring of the bearing II is fixedly connected to the support plate II; the support plate I is located between the side plate and the fixing block;

[0022] The shape of the support plate II is the same as that of the support plate I; both ends of the fixing rod are fixedly connected to the support plate I and the support plate II respectively;

[0023] The support plate I is provided with a through hole III; the force-measuring connecting rod sequentially passes through the through hole I and the through hole III and is fixedly connected to the support plate II; wherein, the force-measuring connecting rod is in transitional fit with the through hole III;

[0024] The measuring head of the force-measuring sensor is fixedly connected to the support plate II and is indirectly fixed to the support plate I through the support plate II and the fixing rod.

[0025] For a pre-oriented yarn dynamic thermal stress testing device as described above, when the lower surface of the support plate I is parallel to the horizontal plane, the central axis of the calibration rod and the central axis of the force-measuring connecting rod are on the same horizontal plane.

[0026] For a pre-oriented yarn dynamic thermal stress testing device as described above, the dynamic thermal stress testing device further includes a tow drawing device; the tow drawing device includes a pre-tensioning device; the pre-tensioning device is used to apply a constant pre-tension to the pre-oriented yarn passing through the pre-tensioning device.

[0027] For a pre-oriented yarn dynamic thermal stress testing device as described above, the pre-tensioning device includes a semi-closed wire guiding porcelain part, a tension chuck, a yarn feeding wheel, a motor I, a single-chip microcomputer chip, a pre-tension tester and a bracket;

[0028] The semi-closed wire guiding porcelain part, the tension chuck, the motor I and the pre-tension tester are fixedly arranged on the bracket in sequence from left to right; the motor shaft of the motor I is fixedly connected to the yarn feeding wheel, and the motor I is used to drive the yarn feeding wheel to rotate; the bracket is fixedly connected to the device main body;

[0029] When the pre-oriented yarn passes through the pre-tension device, the pre-oriented yarn sequentially passes through a semi-closed wire guiding porcelain part, a tension chuck, a yarn feeding wheel, and a pre-tension tester;

[0030] The pre-tension tester is used to detect the pre-tension of the pre-oriented yarn passing through the pre-tension tester. The single-chip microcomputer chip is electrically connected to the pre-tension tester and the motor I respectively. The single-chip microcomputer chip is used to receive the pre-tension value of the pre-oriented yarn passing through the pre-tension tester and compare it with the set value. When the pre-tension value of the pre-oriented yarn passing through the pre-tension tester is not equal to the set value, the single-chip microcomputer chip controls the rotation speed of the motor I to adjust the rotation speed of the yarn feeding wheel so that the pre-tension value of the pre-oriented yarn passing through the pre-tension tester is equal to the set value, so as to improve the stability of the pre-tension value of the pre-oriented yarn passing through the pre-tension tester, reduce the deviation of the measured thermal stress value, and avoid the increase of CV.

[0031] A pre-oriented yarn dynamic thermal stress testing device as described above, the pre-tension tester includes a tension detection sensor, a display screen, and a wire guiding porcelain part;

[0032] The tension detection sensor includes a tension detection head; the tension detection head is used to detect the pre-tension of the pre-oriented yarn passing through the pre-tension tester; the tension detection sensor is electrically connected to the display screen, and the display screen is used to display the pre-tension of the pre-oriented yarn passing through the pre-tension tester;

[0033] The wire guiding porcelain part is used to guide the pre-oriented yarn after the pre-oriented yarn passes through the tension detection head.

[0034] A pre-oriented yarn dynamic thermal stress testing device as described above, the dynamic thermal stress testing device further includes a hot box; the outer surface of the side plate is denoted as side A, and the hot box is installed on side A.

[0035] A pre-oriented yarn dynamic thermal stress testing device as described above, the bracket of the pre-tension device is installed on a surface of the device main body adjacent to side A;

[0036] The tow drafting device further includes a drafting roller, a fixed roller, a motor II, and a negative pressure suction device;

[0037] A through hole IV is provided on the side plate; the motor II is located inside the device main body, and the motor shaft of the motor II passes through the through hole IV and is fixedly connected to the drafting roller. The motor II is used to drive the drafting roller to rotate;

[0038] The fixed roller and the negative pressure suction device are both fixed on side A;

[0039] Both the drafting roller and the fixed roller are perpendicular to side A, and the fixed roller is located above the drafting roller; the heating box is arranged between the drafting roller and the measuring wheel.

[0040] The pre-oriented yarn filaments are introduced through a pre-tension device. After passing around the drafting roller and the fixed roller, they vertically pass through the heating box, and then are introduced upward from the measuring wheel arranged below the heating box to the drafting roller and the fixed roller, and then enter the negative pressure silk suction device. Then, the motor II is started, the drafting roller rotates, and the pre-oriented yarn filaments passing through the heating box are drafted, and the force measuring sensor connected to the measuring wheel measures the thermal stress value.

[0041] Beneficial effects:

[0042] In a dynamic thermal stress testing device for pre-oriented yarn of the present invention, the measuring wheel, the force measuring connecting rod, the support plate I, the calibration rod and the fulcrum bearing in the tension measuring mechanism form a seesaw structure. The upward force received by the measuring wheel can be directly converted into a downward force at the calibration rod. Therefore, when the weight is hung on the calibration rod, the weight of the weight measured by the force measuring sensor is the upward force received by the measuring wheel, and no filament bundle is required for auxiliary linear calibration, which makes the calibration more accurate. Description of the drawings

[0043] Figure 1 It is an overall schematic diagram of a thermal stress testing device of the present invention;

[0044] Figure 2 It is a side view of a thermal stress testing device of the present invention;

[0045] Figure 3 It is a partial schematic diagram of the side plate of a thermal stress testing device of the present invention;

[0046] Figure 4 It is a side view schematic diagram of the tension measuring mechanism of a thermal stress testing device of the present invention (the measuring wheel is not drawn in the figure);

[0047] Figure 5 It is a top view schematic diagram of the tension measuring mechanism of a thermal stress testing device of the present invention (the measuring wheel is not drawn in the figure);

[0048] Figure 6 It is a schematic diagram of the pre-tension device of a thermal stress testing device of the present invention;

[0049] Figure 7 It is a schematic diagram of the prior art tension calibration mechanism;

[0050] Among them, 1 - pre - tension device; 2 - drafting roller; 3 - fixed roller; 4 - hot box; 5 - measuring wheel; 6 - calibration rod; 7 - negative pressure silk suction device; 8 - side plate; 9 - force - measuring connecting rod; 10 - support plate I; 11 - fixed rod; 12 - fulcrum bearing; 13 - support plate II; 14 - force - measuring sensor; 15 - semi - enclosed wire - guiding porcelain part; 16 - tension chuck; 17 - yarn feeding wheel; 18 - bracket; 19 - pre - tension tester; 20 - tension detection sensor; 21 - display screen; 22 - wire - guiding porcelain part; 23 - weight wheel; 24 - weight. Specific embodiments

[0051] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

[0052] A pre - oriented yarn dynamic thermal stress testing device, as Figures 1 - 6 shown, the dynamic thermal stress testing device includes a device main body, a tension measuring mechanism, a tow drafting device, and a hot box 4; the device main body is a hollow cube structure; the device main body includes a side plate 8 and a bottom plate; through - hole I and through - hole II are provided on the side plate 8; through - hole I and through - hole II are respectively used to connect the inside of the dynamic thermal stress testing device main body and the outside;

[0053] As Figures 4 - 5 shown, the tension measuring mechanism includes a measuring wheel 5, a force - measuring connecting rod 9, a support plate I 10, a calibration rod 6, a fulcrum bearing 12, a force - measuring sensor 14, a support plate II 13, bearing II, and a fixed rod 11;

[0054] The fulcrum bearing 12 includes a fixed block and bearing I; the fixed block is fixed on the bottom plate, the outer rings of bearing I and bearing II are both fixedly connected to the fixed block, and bearing I and bearing II are respectively located on two opposite side surfaces of the fixed block; the central axis of bearing I is perpendicular to the side plate 8;

[0055] The support plate I 10 is a rectangular plate, the support plate I 10 is fixedly connected to the inner ring of bearing I, and the center of the support plate I 10 is located on the central axis of bearing I;

[0056] The inner ring of bearing II is fixedly connected to the support plate II 13; the support plate I 10 is located between the side plate 8 and the fixed block; the shape of the support plate II 13 is the same as that of the support plate I; the two ends of the fixed rod 11 are respectively fixedly connected to the support plate I 10 and the support plate II 13;

[0057] The support plate I 10 is provided with a through hole III; the force measuring connecting rod 9 is perpendicular to the side plate 8, the force measuring connecting rod 9 sequentially passes through the through hole I and the through hole III, and is fixedly connected to the support plate II 13, so that a partial section of the force measuring connecting rod 9 is located outside the equipment main body and a partial section is located inside the equipment main body; wherein, the force measuring connecting rod 9 is in transitional fit with the through hole III;

[0058] The measuring wheel 5 is located outside the equipment main body and is fixedly connected to the force measuring connecting rod 9;

[0059] The calibration rod 6 is perpendicular to the side plate 8, one end of the calibration rod 6 is fixedly connected to the support plate I 10, and the other end passes through the through hole II and exposes outside the equipment main body; the projection of the calibration rod 6 on the support plate I 10 and the projection of the force measuring connecting rod 9 on the support plate I 10 are centrosymmetric about the center of the support plate I 10;

[0060] When the lower surface of the support plate I 10 is parallel to the horizontal plane, the central axis of the calibration rod 6 and the central axis of the force measuring connecting rod 9 are on the same horizontal plane;

[0061] When the upward tension received by the measuring wheel 5 is in the range of 0 - 500 cN, the force measuring connecting rod 9 does not contact the hole wall of the through hole I, the calibration rod 6 does not contact the hole wall of the through hole II, and the support plate I 10 does not contact the bottom plate;

[0062] The measuring head of the force sensor 14 is fixedly connected to the support plate II 13, and the central axis of the measuring head of the force sensor 14 coincides with the central axis of the calibration rod 6;

[0063] As Figures 1 - 3 shown, the tow drawing device includes a pre-tensioning device 1, a drawing roller 2, a fixed roller 3, a motor II and a negative pressure suction device 7;

[0064] As Figure 6 shown, the pre-tensioning device 1 includes a semi-enclosed wire guiding porcelain part 15, a tension chuck 16, a yarn feeding wheel 17, a motor I, a single-chip microcomputer chip, a pre-tension tester 19 and a bracket 18;

[0065] The semi-enclosed wire guiding porcelain part 15, the tension chuck 16, the motor I and the pre-tension tester 19 are sequentially fixedly connected to the bracket 18 from left to right; the motor shaft of the motor I is fixedly connected to the yarn feeding wheel 17, and the motor I is used to drive the yarn feeding wheel 17 to rotate;

[0066] When the pre-oriented yarn passes through the pre-tensioning device 1, the pre-oriented yarn sequentially passes through the semi-enclosed wire guiding porcelain part 15, the tension chuck 16, the yarn feeding wheel 17 and the pre-tension tester 19;

[0067] The pre-tension tester 19 includes a tension detection sensor 20, a display screen 21, and a wire guiding porcelain part 22; the tension detection sensor 20 includes a tension detection head; the tension detection head is used to detect the pre-tension of the partially oriented yarn passing through the pre-tension tester 19; the tension detection sensor 20 is electrically connected to the display screen 21, and the display screen 21 is used to display the pre-tension of the partially oriented yarn passing through the pre-tension tester 19; the wire guiding porcelain part 22 is used to guide the partially oriented yarn after it passes through the tension detection head.

[0068] The single-chip microcomputer chip is electrically connected to the tension detection sensor 20 and the motor I respectively. The single-chip microcomputer chip is used to receive the pre-tension value of the partially oriented yarn passing through the pre-tension tester 19 sent by the tension detection sensor 20 and compare it with the set value. When the pre-tension value of the partially oriented yarn passing through the pre-tension tester 19 is not equal to the set value, the single-chip microcomputer chip controls the rotation speed of the motor I to adjust the rotation speed of the yarn feeding roller 17 so that the pre-tension value of the partially oriented yarn passing through the pre-tension tester 19 is equal to the set value.

[0069] The outer surface of the side plate 8 is denoted as side A, and the hot box 4 is installed on side A; the bracket 18 of the pre-tension device 1 is installed on a surface of the equipment main body adjacent to side A.

[0070] A through hole IV is provided on the side plate 8; the motor II is located inside the equipment main body, and the motor shaft of the motor II passes through the through hole IV and is fixedly connected to the drafting roller 2. The motor II is used to drive the drafting roller 2 to rotate.

[0071] The fixed roller 3 and the negative pressure suction device 7 are both fixed on side A.

[0072] The drafting roller 2 and the fixed roller 3 are both perpendicular to side A, and the fixed roller 3 is located above the drafting roller 2; the hot box 4 is arranged between the drafting roller 2 and the measuring wheel 5.

[0073] Specific usage process: The partially oriented yarn filament is introduced through the pre-tension device 1, bypasses the drafting roller 2 and the fixed roller 3, then vertically passes through the hot box 4, is introduced upward from the measuring wheel 5 arranged below the hot box 4 to the drafting roller 2 and the fixed roller 3, and then enters the negative pressure wire suction device 7; then the motor II is started, the drafting roller 2 rotates, and the partially oriented yarn filament passing through the hot box 4 is drafted, and the force measuring sensor connected to the measuring wheel 5 measures the thermal stress value.

[0074] When calibration is carried out, first let the pre-oriented filament get away from the measuring wheel 5, and then perform zero calibration and linear calibration respectively. Among them, the measuring wheel 5, the force-measuring connecting rod 9, the support plate I 10, the calibration rod 6 and the fulcrum bearing 12 in the tension measuring mechanism of the present invention form a seesaw structure. When the measuring wheel 5 is subjected to an upward tension, the force-measuring connecting rod 9 moves upward and drives the support plate I 10 to rotate around the center of the support plate I 10. At this time, the calibration rod 6 moves downward. The upward force received by the measuring wheel 5 can be directly converted into a downward force at the calibration rod 6. Therefore, when the weight is hung on the calibration rod 6, the weight of the weight measured by the force-measuring sensor is the upward force received by the measuring wheel, and no filament bundle is needed for auxiliary linear calibration, which makes the calibration more accurate. Although the seesaw structure itself also has weight, when zero calibration is carried out, the tare has been removed and it will not affect the accuracy of the linear calibration result.

Claims

1. A dynamic thermal stress testing device for pre-oriented yarns, characterized in that, It includes a device main body and a tension measuring mechanism; the device main body is a hollow cube structure; the device main body includes side plates (8) and a bottom plate; through hole I and through hole II are provided on the side plates (8). The tension measuring mechanism includes a measuring wheel (5), a force measuring connecting rod (9), a support plate I (10), a calibration rod (6), a fulcrum bearing (12), and a force measuring sensor (14). The fulcrum bearing (12) includes a fixed block and bearing I; the fixed block is fixed on the bottom plate, and the outer ring of bearing I is fixed on one side of the fixed block; the central axis of bearing I is perpendicular to the side plate (8). The support plate I (10) is a rectangular plate, and the support plate I (10) is fixedly connected to the inner ring of bearing I, and the center of the support plate I (10) is located on the central axis of bearing I. The force measuring connecting rod (9) is perpendicular to the side plate (8), and the force measuring connecting rod (9) passes through through hole I and is fixedly connected to the support plate I (10), so that part of the force measuring connecting rod (9) is located outside the device main body and part is located inside the device main body. The measuring wheel (5) is located outside the device main body and is fixedly connected to the force measuring connecting rod (9). The calibration rod (6) is perpendicular to the side plate (8), one end of the calibration rod (6) is fixedly connected to the support plate I (10), and the other end passes through through hole II and exposes outside the device main body; the projection of the calibration rod (6) on the support plate I (10) is centrosymmetric with the projection of the force measuring connecting rod (9) on the support plate I (10) about the center of the support plate I (10). When the upward tension received by the measuring wheel (5) is in the range of 0 - 500 cN, the force measuring connecting rod (9) does not contact the hole wall of through hole I, the calibration rod (6) does not contact the hole wall of through hole II, and the support plate I (10) does not contact the bottom plate. The measuring head of the force measuring sensor (14) is fixedly connected to the support plate I (10), and the central axis of the measuring head of the force measuring sensor (14) coincides with the central axis of the calibration rod (6).

2. The dynamic thermal stress testing device for pre-oriented yarn according to claim 1, characterized in that, The tension measuring mechanism further includes a support plate II (13), bearing II, and a fixing rod (11). The outer ring of bearing II is fixedly connected to the fixed block, and bearing I and bearing II are respectively located on two opposite sides of the fixed block; the inner ring of bearing II is fixedly connected to the support plate II (13); the support plate I (10) is located between the side plate (8) and the fixed block. The shape of the support plate II (13) is the same as that of the support plate I; both ends of the fixing rod (11) are fixedly connected to the support plate I (10) and the support plate II (13) respectively. A through hole III is provided on the support plate I (10); the force measuring connecting rod (9) passes through through hole I and through hole III in sequence and is fixedly connected to the support plate II (13); among them, the force measuring connecting rod (9) has an interference fit with through hole III. The measuring head of the force measuring sensor (14) is fixedly connected to the support plate II (13).

3. The dynamic thermal stress testing device for pre-oriented yarn according to claim 1, wherein When the lower surface of the support plate I (10) is parallel to the horizontal plane, the central axis of the calibration rod (6) and the central axis of the force measuring connecting rod (9) are on the same horizontal plane.

4. The dynamic thermal stress testing device for pre-oriented yarn according to claim 1, wherein The dynamic thermal stress test device further includes a tow drawing device; the tow drawing device includes a pre-tension device (1); the pre-tension device (1) is used to apply a constant pre-tension to the pre-oriented yarn passing through the pre-tension device (1).

5. The dynamic thermal stress testing device for pre-oriented yarn according to claim 4, characterized in that, The pre-tensioning device (1) includes a semi-closed wire guiding porcelain piece (15), a tension chuck (16), a yarn feeding wheel (17), a motor I, a single-chip microcomputer chip, a pre-tension tester (19) and a bracket; The semi-closed wire guiding porcelain piece (15), the tension chuck (16), the motor I and the pre-tension tester (19) are sequentially fixed on the bracket from left to right; the motor shaft of the motor I is fixedly connected to the yarn feeding wheel (17), and the motor I is used to drive the yarn feeding wheel (17) to rotate; the bracket is fixedly connected to the equipment main body; The pre-tension tester (19) is used to detect the pre-tension of the partially oriented yarn passing through the pre-tension tester (19). The single-chip microcomputer chip is electrically connected to the pre-tension tester (19) and the motor I respectively. The single-chip microcomputer chip is used to receive the pre-tension value of the partially oriented yarn passing through the pre-tension tester (19) and compare it with the set value. When the pre-tension value of the partially oriented yarn passing through the pre-tension tester (19) is not equal to the set value, the single-chip microcomputer chip controls the rotation speed of the motor I to adjust the rotation speed of the yarn feeding wheel (17) so that the pre-tension value of the partially oriented yarn passing through the pre-tension tester (19) is equal to the set value.

6. The dynamic thermal stress testing device for pre-oriented yarn according to claim 5, characterized in that, The pre-tension tester (19) includes a tension detection sensor (20), a display screen (21) and a wire guiding porcelain piece (22); The tension detection sensor (20) includes a tension detection head; the tension detection head is used to detect the pre-tension of the partially oriented yarn passing through the pre-tension tester (19); the tension detection sensor (20) is electrically connected to the display screen (21), and the display screen (21) is used to display the pre-tension of the partially oriented yarn passing through the pre-tension tester (19); The wire guiding porcelain piece (22) is used to guide the partially oriented yarn after the partially oriented yarn passes through the tension detection head.

7. A pre-oriented yarn dynamic thermal stress testing device according to claim 6, characterized in that, The dynamic thermal stress test equipment further includes a hot box (4); the outer surface of the side plate (8) is denoted as side A, and the hot box (4) is installed on side A.

8. The dynamic thermal stress testing device for pre-oriented yarn according to claim 7, wherein, The bracket is installed on a surface of the equipment main body adjacent to side A; The filament drafting device further includes a drafting roller (2), a fixed roller (3), a motor II and a negative pressure suction device (7); A through hole IV is provided on the side plate (8); the motor II is located inside the equipment main body, and the motor shaft of the motor II passes through the through hole IV and is fixedly connected to the drafting roller (2), and the motor II is used to drive the drafting roller (2) to rotate; The fixed roller (3) and the negative pressure suction device (7) are both fixed on side A; The drafting roller (2) and the fixed roller (3) are both perpendicular to side A, and the fixed roller (3) is located above the drafting roller (2); the hot box (4) is arranged between the drafting roller (2) and the measuring wheel (5).

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