Dynamic thermal stress testing equipment for pre-oriented yarn

Abstract

The invention relates to pre-oriented yarn dynamic thermal stress testing equipment which comprises an equipment body and a tension measuring mechanism. The equipment main body is of a hollow cubic structure; the equipment main body comprises side plates and a bottom plate; a through hole I and a through hole II are formed in the side plate; the tension measuring mechanism comprises a measuring wheel, a force measuring connecting rod, a supporting plate I, a correcting rod, a fulcrum bearing and a force measuring sensor; the fulcrum bearing comprises a fixed block and a bearing I; the fixed block is fixed on the bottom plate; 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 vertical to the side plate; the supporting plate I is a rectangular plate, the supporting plate I is fixedly connected with an inner ring of the bearing I, and the center of the supporting plate I is located on the central axis of the bearing I; the force measuring connecting rod is perpendicular to the side plate and penetrates through the through hole I to be fixedly connected with the supporting plate I, so that part of the force measuring connecting rod is located outside the equipment body, and part of the force measuring connecting rod is located in the equipment body. During testing, tow auxiliary linear correction is not needed, and correction is more accurate.

Description

Technical Field

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

[0002] During the use of the pre-oriented yarn dynamic thermal stress test equipment, the force sensor often needs to be calibrated. The force sensor is connected to the measuring wheel of the pre-oriented yarn dynamic thermal stress test equipment, and mainly measures the thermal stress value of the pre-oriented yarn after passing through the measuring wheel after passing through the heat box. In order to ensure the accuracy of the calibration, zero point calibration and linear calibration are usually required.

[0003] Zero point calibration refers to adjusting the output of the force sensor so that the reading of the measuring wheel is zero when there is no load. Linear calibration refers to checking whether the response of the force sensor is linear based on the applied known standard force and the output of the force sensor. If the output of the force sensor is not proportional to the applied force (that is, the output signal and the actual force do not match), it needs to be adjusted through calibration software or hardware.

[0004] When the pre-oriented yarn dynamic thermal stress test equipment is performing linear calibration, it is necessary to prepare a yarn bundle and a weight. One end of the yarn bundle is fixed on a fixed roller, such as Figure 7 As shown, the other end passes vertically downward through the heat box 4, bypasses the measuring wheel 5, and then bypasses the weight wheel 23 upward to connect with the weight 24. Through the output of the weight and the force sensor, check whether the response of the force sensor is linear; wherein, since the measuring wheel is subjected to 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 wire bundle. In this method of the prior art, each time a linear correction is performed, an additional wire bundle needs to be prepared to assist in the linear correction, which makes the linear correction process complicated and time-consuming, and the force on the measuring wheel includes the weight of the weight and part of the weight of the line, which will cause a slight error.

[0005] The patent with the authorization publication number CN216955428U discloses a heating mechanism and a chemical fiber filament thermal stress detection mechanism, and proposes a stress measurement mechanism consisting of a zero adjustment mechanism and a tension measurement mechanism. Its working principle is that the transmission mechanism motor drives the belt to drive the zero adjustment drum and the zero adjustment outer ring, and changes the position of the two adjustment parts to switch between the two working states of force zero adjustment and force measurement. However, the force zero adjustment is equivalent to zero point correction, and there is no record of how to quickly correct the linearity.

[0006] Therefore, it is of great significance to study a pre-oriented yarn dynamic thermal stress testing equipment to solve the above problems. Summary of the invention

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

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

[0009] A pre-oriented yarn dynamic thermal stress testing device, the dynamic thermal stress testing device comprises a device body and a tension measuring mechanism; the device body is a hollow cubic structure; the device body comprises a side plate and a bottom plate; a through hole I and a through hole II are provided on the side plate; the through hole I and the through hole II are respectively used to connect the inside and the outside of the dynamic thermal stress testing device body;

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

[0011] The fulcrum bearing comprises 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 of the fixed block; the central axis of the bearing I is perpendicular to the side plate;

[0012] The support plate I is a rectangular plate, the support plate I is fixedly connected to 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;

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

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

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

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

[0017] The measuring head of the force sensor is fixedly connected to the support plate 1, and the central axis of the measuring head of the force sensor coincides with the central axis of the correction rod;

[0018] The measuring wheel, force measuring link, support plate I, correction rod and fulcrum bearing in the tension measuring mechanism form a seesaw structure. The upward force exerted on the measuring wheel can be directly converted into a downward force on the correction rod. Therefore, when the weight is hung on the correction rod, the weight of the weight measured by the force sensor is the upward force exerted on the measuring wheel. No wire bundle-assisted linear correction is required, which makes the correction more accurate. Although the seesaw structure itself has weight, it has been peeled during zero-point correction, which will not affect the accuracy of the linear correction result.

[0019] As the preferred technical solution:

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

[0021] 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 support plate II; support plate I is located between the side plate and the fixed block;

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

[0023] A through hole III is provided on the support plate I; the force measuring connecting rod passes through the through hole I and the through hole III in sequence and is fixedly connected to the support plate II; wherein the force measuring connecting rod is transitionally matched with the through hole III;

[0024] The measuring head of the force 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] In the 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 correction rod and the central axis of the force measuring connecting rod are on the same horizontal plane.

[0026] As described above, the dynamic thermal stress testing device for pre-oriented yarns further comprises a yarn drawing device; the yarn drawing device comprises a pre-tensioning device; the pre-tensioning device is used to apply a constant pre-tensioning device to the pre-oriented yarns passing through the pre-tensioning device.

[0027] A pre-oriented yarn dynamic thermal stress testing device as described above, wherein the pre-tension device comprises a semi-enclosed wire guide porcelain, 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-enclosed wire guide porcelain, the tension chuck, the motor I and the pre-tension tester are fixed on the bracket from left to right in sequence; 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 main body of the equipment;

[0029] When the pre-oriented yarn passes through the pre-tension device, the pre-oriented yarn passes through the semi-enclosed wire guide porcelain, the tension chuck, the yarn feeding wheel and the pre-tension tester in sequence;

[0030] The pretension tester is used to detect the pretension of the pre-oriented yarn after passing through the pretension tester. The single-chip microcomputer chip is electrically connected to the pretension tester and motor I respectively. The single-chip microcomputer chip is used to receive the pretension value sent by the pretension tester and compare it with the set value. When the pretension value passed through the pretension tester is not equal to the set value, the single-chip microcomputer chip controls the speed of motor I to adjust the speed of the yarn feeding wheel so that the pretension value passed through the pretension tester is equal to the set value, so as to improve the stability of the pretension value passed through the pretension tester, reduce the deviation of the tested 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 comprises a tension detection sensor, a display screen, and a guide wire porcelain piece;

[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 guide porcelain is used to guide the pre-oriented wire after the pre-oriented wire passes through the tension detection head.

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

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

[0036] The tow drafting device also 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 main body of the device, the motor shaft of the motor II passes through the through hole IV and is fixedly connected to the drafting roller, and 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 the side A;

[0039] The drafting roller and the fixed roller are both perpendicular to the 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 filaments are introduced through the pre-tension device, bypass the drawing roller and the fixed roller, and then vertically pass through the heating box, and are introduced upward from the measuring wheel arranged under the heating box to the drawing roller and the fixed roller, and then enter the negative pressure wire suction device; then the motor II is started, the drawing roller rotates, the pre-oriented filaments passing through the heating box are drawn, and the force sensor connected to the measuring wheel measures the thermal stress value.

[0041] Beneficial effects:

[0042] The present invention provides a pre-oriented yarn dynamic thermal stress testing device, wherein the measuring wheel, force measuring connecting rod, support plate I, correction rod and fulcrum bearing in the tension measuring mechanism form a seesaw structure, and the upward force exerted on the measuring wheel can be directly converted into a downward force at the correction rod. Therefore, when the weight is hung on the correction rod, the weight of the weight measured by the force sensor is the upward force exerted on the measuring wheel, and no yarn bundle-assisted linear correction is required, which makes the correction more accurate. BRIEF 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 A side view of a thermal stress testing device of the present invention;

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

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

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

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

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

[0050] Among them, 1-pretension device; 2-drafting roller; 3-fixed roller; 4-heat box; 5-measuring wheel; 6-correction rod; 7-negative pressure wire 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 sensor; 15-semi-enclosed wire guide porcelain; 16-tension chuck; 17-yarn feeding wheel; 18-bracket; 19-pretension tester; 20-tension detection sensor; 21-display screen; 22-wire guide porcelain; 23-weight wheel; 24-weight. DETAILED DESCRIPTION

[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 are not intended 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 fall within the scope limited by the appended claims of the application equally.

[0052] A pre-oriented yarn dynamic thermal stress testing device, such as Figures 1 to 6 As shown, the dynamic thermal stress test equipment includes an equipment body, a tension measuring mechanism, a tow drawing device and a heat box 4; the equipment body is a hollow cubic structure; the equipment body includes a side plate 8 and a bottom plate; the side plate 8 is provided with a through hole I and a through hole II; the through hole I and the through hole II are used to connect the inside and the outside of the dynamic thermal stress test equipment body respectively;

[0053] like Figures 4 and 5 As shown, the tension measuring mechanism includes a measuring wheel 5, a force measuring link 9, a support plate I 10, a correction rod 6, a fulcrum bearing 12, a force measuring sensor, a support plate II 13, a bearing II and a fixing rod 11;

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

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

[0056] The inner ring of the 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 fixing rod 11 are fixedly connected to the support plate I 10 and the support plate II 13 respectively;

[0057] A through hole III is provided on the support plate I 10; the force measuring connecting rod 9 is perpendicular to the side plate 8, and the force measuring connecting rod 9 passes through the through hole I and the through hole III in sequence, and is fixedly connected to the support plate II 13, so that part of the force measuring connecting rod 9 is located outside the device body, and part of the force measuring connecting rod 9 is located inside the device body; wherein, the force measuring connecting rod 9 is transitionally matched with the through hole III;

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

[0059] The correction rod 6 is perpendicular to the side plate 8, one end of the correction rod 6 is fixedly connected to the support plate I 10, and the other end passes through the through hole II and is exposed outside the device body; the projection of the correction 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 symmetrical about the center of the support plate I 10;

[0060] When the lower surface of the support plate 1 10 is parallel to the horizontal plane, the central axis of the correction rod 6 and the central axis of the force measuring connecting rod 9 are on the same horizontal plane;

[0061] When the measuring wheel 5 is subjected to an upward tension in the range of 0 to 500 cN, the force measuring connecting rod 9 does not contact the hole wall of the through hole I, the correction 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 correction rod 6;

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

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

[0065] The semi-enclosed wire guide porcelain 15, the tension chuck 16, the motor 1 and the pre-tension tester 19 are fixed on the bracket 18 from left to right in sequence; the motor shaft of the motor 1 is fixedly connected to the yarn feeding wheel 17, and the motor 1 is used to drive the yarn feeding wheel 17 to rotate;

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

[0067] The pretension tester 19 includes a tension detection sensor 20, a display screen 21, and a wire guide porcelain piece 22; the tension detection sensor 20 includes a tension detection head; the tension detection head is used to detect the pretension of the pre-oriented wire passing through the pretension 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 pretension of the pre-oriented wire passing through the pretension tester 19; the wire guide porcelain piece 22 is used to guide the pre-oriented wire after the pre-oriented wire passes through the tension detection head;

[0068] The single-chip microcomputer chip is electrically connected to the tension detection sensor 20 and the motor 1 respectively. The single-chip microcomputer chip is used to receive the pre-tension value sent by the tension detection sensor 20 and passed through the pre-tension tester 19 and compare it with the set value. When the pre-tension value passed through the pre-tension tester 19 is not equal to the set value, the single-chip microcomputer chip controls the speed of the motor 1 to adjust the speed of the yarn feeding wheel 17 so that the pre-tension value passed through the pre-tension tester 19 is equal to the set value.

[0069] The outer surface of the side plate 8 is marked as side A, and the heat box 4 is installed on the side A; the bracket 18 of the pretension device 1 is installed on a surface of the equipment body adjacent to the side A;

[0070] A through hole IV is provided on the side plate 8; the motor II is located inside the main body of the device, 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;

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

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

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

[0074] When performing calibration, first let the pre-oriented silk filaments leave the measuring wheel 5, and then perform zero-point calibration and linear calibration respectively; wherein, the measuring wheel 5, the force measuring link 9, the support plate 110, 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 upward tension, the force measuring link 9 moves upward and drives the support plate 110 to rotate around the center of the support plate 110, and at this time the calibration rod 6 moves downward; the upward force exerted on 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 sensor is the upward force exerted on the measuring wheel, and no tow-assisted linear calibration is required, which makes the calibration more accurate; although the seesaw structure itself also has weight, it has been peeled when performing zero-point calibration, which will not affect the accuracy of the linear calibration result.

Claims

1. A pre-oriented yarn dynamic thermal stress testing device, characterized in that: The device comprises a device body and a tension measuring mechanism; the device body is a hollow cubic structure; the device body comprises a side plate (8) and a bottom plate; the side plate (8) is provided with a through hole I and a through hole II; The tension measuring mechanism comprises a measuring wheel (5), a force measuring connecting rod (9), a support plate I (10), a correction rod (6), a fulcrum bearing (12) and a force measuring sensor; The fulcrum bearing (12) comprises 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 a side surface of the fixed block; the central axis of the bearing I is perpendicular to the side plate (8); The support plate I (10) is a rectangular plate, the support plate I (10) is fixedly connected to the inner ring of the bearing I, and the center of the support plate I (10) is located on the central axis of the bearing I; The force measuring connecting rod (9) is perpendicular to the side plate (8), and the force measuring connecting rod (9) passes through the 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 body, and part of the force measuring connecting rod (9) is located inside the device body; The measuring wheel (5) is located outside the device body and is fixedly connected to the force measuring connecting rod (9); The correction rod (6) is perpendicular to the side plate (8), one end of the correction rod (6) is fixedly connected to the support plate I (10), and the other end passes through the through hole II and is exposed outside the device body; the projection of the correction 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 symmetrical about the center of the support plate I (10); When the measuring wheel (5) is subjected to an upward tension in the range of 0 to 500 cN, the force measuring connecting rod (9) does not contact the hole wall of the through hole I, the correction 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; The measuring head of the force sensor (14) is fixedly connected to the support plate I (10), and the central axis of the measuring head of the force sensor (14) coincides with the central axis of the calibration rod (6).

2. A pre-oriented yarn dynamic thermal stress testing device according to claim 1, characterized in that: The tension measuring mechanism further comprises a support plate II (13), a bearing II and a fixing rod (11); The outer ring of the bearing II is fixedly connected to the fixed block, and the bearing I and the bearing II are respectively located on two opposite sides of the fixed block; the inner ring of the 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 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 the through hole I and the through hole III in sequence and is fixedly connected to the support plate II (13); wherein the force measuring connecting rod (9) is transitionally matched with the through hole III; The measuring head of the force sensor (14) is fixedly connected to the support plate II (13).

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

4. The pre-oriented yarn dynamic thermal stress testing device according to claim 1, characterized in that: The dynamic thermal stress testing device also includes a yarn drawing device; the yarn 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 pre-oriented yarn dynamic thermal stress testing device according to claim 4, characterized in that: The pretension device (1) comprises a semi-enclosed wire guide porcelain component (15), a tension chuck (16), a yarn feeding wheel (17), a motor I, a single-chip microcomputer chip, a pretension tester (19) and a bracket; The semi-enclosed wire guide porcelain (15), the tension chuck (16), the motor I and the pre-tension tester (19) are fixed on the bracket from left to right in sequence; 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 device body; The pretension tester (19) is used to detect the pretension of the pre-oriented yarn passing through the pretension tester (19); the single-chip microcomputer chip is electrically connected to the pretension tester (19) and the motor I respectively; the single-chip microcomputer chip is used to receive the pretension value sent by the pretension tester (19) and the pretension value passing through the pretension tester (19) and compare it with the set value; when the pretension value passing through the pretension 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 pretension value passing through the pretension tester (19) is equal to the set value.

6. A pre-oriented yarn dynamic thermal stress testing device according to claim 5, characterized in that: The pretension tester (19) comprises a tension detection sensor (20), a display screen (21), and a guide wire porcelain component (22); The tension detection sensor (20) comprises a tension detection head; the tension detection head is used to detect the pre-tension of the pre-oriented yarn after passing through the pre-tension tester (19); the tension detection sensor (20) is electrically connected to a display screen (21); the display screen (21) is used to display the pre-tension of the pre-oriented yarn after passing through the pre-tension tester (19); The guide wire porcelain piece (22) is used to guide the pre-oriented wire after the pre-oriented wire 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 testing device further comprises a heat box (4); the outer surface of the side plate (8) is marked as side A, and the heat box (4) is mounted on side A.

8. The pre-oriented yarn dynamic thermal stress testing device according to claim 7, characterized in that: The bracket is installed on a surface of the device body adjacent to the side A; The tow drafting device further comprises 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); a motor II is located inside the main body of the device, a 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 the side A; The drafting roller (2) and the fixed roller (3) are both perpendicular to the side A, and the fixed roller (3) is located above the drafting roller (2); the heat box (4) is arranged between the drafting roller (2) and the measuring wheel (5).

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