A multi-point tensile strength testing device for polyester tow

Abstract

The present invention relates to the field of tensile strength detection of yarn bundles, and specifically to a multi-point tensile strength detection device for polyester yarn bundles, comprising a stretching mechanism for stretching the yarn bundles, and a sensing mechanism for monitoring the stretching process of the yarn bundles, the stretching mechanism comprising an upper slide plate and a lower slide plate, the upper slide plate and the lower slide plate are respectively provided with a first positioning member, the stretching mechanism also comprises an upper movable plate and a lower movable plate, the upper movable plate and the lower movable plate are respectively provided with a second positioning member, when the yarn bundle is stretched, the yarn bundle section located between the upper movable plate and the lower movable plate, and the yarn bundle section located between the upper movable plate and the upper slide plate, and between the lower movable plate and the lower slide plate are stretched, the present invention judges the overall strength of the yarn bundle by multi-point fixing and segmented stretching, and by whether each section of the yarn bundle is broken during the stretching process, effectively avoiding the problem of local stress concentration that may be caused by traditional single-point stretching, and ensuring a comprehensive evaluation of the entire yarn bundle length.

Description

Technical Field

[0001] The invention relates to the field of yarn bundle tensile strength detection, and in particular to a polyester yarn bundle multi-point tensile strength detection device. Background Art

[0002] The tensile strength of polyester tow needs to be tested to determine whether it meets the requirements of the manufactured product. The existing technology mostly tests the tensile strength of a section of polyester tow when testing it, but the tow may have weak spots, where the tow is easy to break. It is impossible to determine the tensile strength of only one section of polyester tow, and multiple tests will take a lot of time.

[0003] The currently disclosed Chinese patent CN217084472U polyester tow twisted tensile strength detection device includes a base, a motor, a screw, a moving component and a fixed component, several of the fixed components are fixedly connected to the base, and several of the moving components are arranged on adjacent fixed components. The moving component includes a threaded barrel and a connecting plate, the threaded barrel is fixedly connected to the bottom of the connecting plate, and a tension sensor is fixedly connected to the top of the connecting plate. The threaded barrel is threadedly connected to the screw, and the screw is coaxially connected to the rotating shaft of the motor. The fixed component includes a fixed block, and the fixed block is provided with a first through groove running through the thickness direction thereof, and a pressure plate is arranged in the first through groove.

[0004] According to the above patent, by fixing the polyester tow on a fixed component and a movable component respectively, and driving the screw to rotate by a motor, multiple movable components can be moved in a direction away from the corresponding fixed component, and the tensile strength of multiple sections of polyester tow can be measured at one time, thereby reducing errors, making the data more accurate, and also reducing the time required for measurement. However, after the adjacent fixed components fix the tow, the range of stretching the tow driven by the movable component is limited, and only the stretching test can be performed on the adjacent fixed components. This detection range easily causes the tow to be unable to be stretched to a specified degree, thereby resulting in inaccurate tensile strength test of the tow. Therefore, there is a need for a detection device that ensures that the tow can be stretched to a specified degree during multi-point detection of polyester tow. Summary of the invention

[0005] In view of the problems existing in the prior art, a multi-point tensile strength testing device for polyester tow is provided. The present invention judges the overall strength of the tow by multi-point fixation and segmented stretching, and by detecting whether each segment of the tow breaks during the stretching process. This effectively avoids the problem of local stress concentration that may be caused by traditional single-point stretching, and ensures a comprehensive evaluation of the entire tow length.

[0006] In order to solve the problems of the prior art, the present invention provides a multi-point tensile strength testing device for polyester yarn bundles, which is arranged on a frame. The testing device includes a stretching mechanism for stretching the yarn bundle, and a sensing mechanism for monitoring the stretching process of the yarn bundle. The stretching mechanism includes an upper slide plate and a lower slide plate that can slide on the frame. The upper slide plate and the lower slide plate are respectively provided with a first positioning piece for fixing the end of the yarn bundle. The stretching mechanism also includes an upper movable plate and a lower movable plate that can slide on the frame. The upper movable plate and the lower movable plate are respectively provided with a second positioning piece for the end of the yarn bundle to pass through and fix the section close to the midpoint. When the yarn bundle is stretched, the yarn bundle section between the upper movable plate and the lower movable plate, and the yarn bundle section between the upper movable plate and the upper slide plate, and between the lower movable plate and the lower slide plate are stretched.

[0007] Preferably, self-locking components are respectively provided between the upper movable plate and the upper sliding plate, and between the lower movable plate and the lower sliding plate, and blocks are respectively provided on the frame at the moving ends of the upper movable plate and the lower movable plate. When the upper movable plate and the lower movable plate are respectively stopped by the corresponding blocks, the self-locking components are automatically released from the fixed state, so that the upper sliding plate and the lower sliding plate can continue to move to stretch the wire bundle.

[0008] Preferably, the self-locking assembly includes connectors arranged on the corresponding upper sliding plate and lower sliding plate, and the edges of the upper movable plate and the lower movable plate are respectively provided with card interfaces for the corresponding connectors to be inserted therein.

[0009] Preferably, a middle partition is provided on the frame and between the upper movable plate and the lower movable plate. When both the upper movable plate and the lower movable plate are in contact with the middle partition, the filament bundle is in an unstretched state.

[0010] Preferably, the upper slide plate and the lower slide plate are both provided with a push plate for pushing the corresponding upper movable plate and lower movable plate. When the push plate contacts the corresponding upper movable plate and lower movable plate, the connector is aligned with the corresponding card interface.

[0011] Preferably, the plug-in connector has an inserting block that can be inserted into the card interface, and a plug-in driver that can drive the inserting block to move.

[0012] Preferably, the plug block has a guide rod extending outward along the opening direction of the card interface, and the upper slide plate and the lower slide plate both have a guide sleeve for the corresponding guide rod to pass through, and a compression spring mounted on the guide rod is fixedly connected between the guide sleeve and the plug block. When the plug block is inserted into the card interface, the compression spring is in a state of not being acted upon by external force.

[0013] Preferably, the plug-in driver has a lever that can push the plug block outward, and the upper slide plate and the lower slide plate both have an axle seat for rotationally connecting one end of the corresponding lever, and the other end of the lever is provided with a slot along its length direction, and the plug block has a protrusion that can slide in the slot.

[0014] Preferably, the first positioning member and the second positioning member both have a wheel disc on which the filament bundle can be wound, and a pressing block for pressing the filament bundle onto the wheel disc.

[0015] Preferably, a limiting wheel capable of keeping the yarn bundle in a straight state between two adjacent wheel discs is provided beside the wheel disc of the second positioning member.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention uses multi-point fixation and segmented stretching to stretch the sections of the filament bundle between the upper movable plate and the lower movable plate, as well as the sections between the upper movable plate and the upper sliding plate, and between the lower movable plate and the lower sliding plate. The overall strength of the filament bundle is judged by determining whether each section of the filament bundle is broken during the stretching process, thereby realizing the tensile strength detection of the filament bundle at different positions, effectively avoiding the problem of local stress concentration that may be caused by traditional single-point stretching, improving the accuracy of the test results, ensuring a comprehensive evaluation of the entire length of the filament bundle, and facilitating the discovery of potential strength unevenness problems.

[0018] 2. The present invention, through the exquisite coordination of the self-locking components and the blocks between the upper movable plate, the upper sliding plate and the lower movable plate, the lower sliding plate, firstly stretches the middle section of the filament bundle to a predetermined degree to detect its local strength, and then automatically switches to stretching the two end sections of the filament bundle to ensure that the entire filament bundle is comprehensively evaluated. This not only improves the automation level of the detection process, but also reduces the driving source. It is only necessary to drive the upper sliding plate and the lower sliding plate to detect multiple sections of the filament bundle. Compared with the synchronous driving and stretching of the middle section and the two end sections of the filament bundle, the step-by-step stretching effectively avoids the risk of interrupting the entire test process due to the two ends reaching the limit first, thereby optimizing the detection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a schematic diagram of the three-dimensional structure of a polyester tow multi-point tensile strength testing device facing the front.

[0020] Figure 2 The present invention is a three-dimensional structural schematic diagram of a polyester yarn bundle multi-point tensile strength testing device facing the back.

[0021] Figure 3 It is a plan cross-sectional view of a polyester tow multi-point tensile strength testing device.

[0022] Figure 4 It is a three-dimensional structural cross-sectional view of a polyester tow multi-point tensile strength testing device.

[0023] Figure 5 The present invention is a plan view of a polyester tow multi-point tensile strength testing device showing the tow in an unstretched state.

[0024] Figure 6The present invention is a plan view schematic diagram of a polyester tow multi-point tensile strength testing device showing a tow in a stretched state.

[0025] Figure 7 The present invention is a partial three-dimensional structural schematic diagram of a stretching mechanism of a polyester tow multi-point tensile strength testing device.

[0026] Figure 8 yes Figure 7 An enlarged schematic diagram of point A.

[0027] Fig. 9 The present invention is a plan view schematic diagram of a polyester tow multi-point tensile strength testing device in which an upper slide plate and an upper moving plate are kept in a fixed state.

[0028] Fig.10 The present invention is a plan view schematic diagram of an upper slide plate and an upper movable plate of a polyester tow multi-point tensile strength testing device in an unfixed state.

[0029] The numbers in the figure are: 1, frame; 11, wire bundle; 12, stopper; 13, middle partition; 2, upper slide plate; 21, push plate; 3, lower slide plate; 4, first positioning member; 41, wheel disc; 411, limiting wheel; 42, pressure block; 421, cylinder; 5, upper movable plate; 6, lower movable plate; 7, second positioning member; 8, self-locking assembly; 81, plug-in; 811, plug-in block; 8111, guide rod; 8112, guide sleeve; 8113, compression spring; 812, bump; 82, plug-in driver; 821, lever; 822, shaft seat; 8221, fixed magnet; 8222, movable magnet. DETAILED DESCRIPTION

[0030] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] See also Figure 1-Figure 6 As shown, a multi-point tensile strength testing device for polyester tow is arranged on a frame 1, and the testing device includes a stretching mechanism for stretching the tow 11, and a sensing mechanism for monitoring the stretching process of the tow 11, the stretching mechanism includes an upper slide plate 2 and a lower slide plate 3 that can slide on the frame 1, and the upper slide plate 2 and the lower slide plate 3 are respectively provided with a first positioning member 4 for fixing the end of the tow 11, and the stretching mechanism also includes an upper movable plate 5 and a lower movable plate 6 that can slide on the frame 1, and the upper movable plate 5 and the lower movable plate 6 are respectively provided with a second positioning member 7 for the end of the tow 11 to pass through and fix the section close to the midpoint thereof, when the tow 11 is stretched, the section of the tow 11 located between the upper movable plate 5 and the lower movable plate 6, and the section of the tow 11 located between the upper movable plate 5 and the upper slide plate 2, and between the lower movable plate 6 and the lower slide plate 3 are stretched.

[0032] The moving directions of the upper slide plate 2, the upper movable plate 5, the lower slide plate 3 and the lower movable plate 6 are all maintained in the same straight line. When the tensile strength of the polyester tow 11 is tested, first, the two ends of the polyester tow 11 to be tested are respectively fixed on the first positioning members 4 of the upper slide plate 2 and the lower slide plate 3 to ensure that they are firmly fixed. Then, the designated section in the middle of the tow 11 is fixed at a position close to the midpoint of the tow 11 through the second positioning members 7 of the upper movable plate 5 and the lower movable plate 6 to form a multi-point support and stretching layout. Subsequently, the hydraulic system of the testing equipment is started to drive the upper slide plate 2 and the lower slide plate 3 to slide outward along a preset straight line direction. At the same time, the upper movable plate 5 and the lower movable plate 6 also move in the same straight line direction, but the moving speed of the upper movable plate 5 and the lower movable plate 6 is slower than that of the upper slide plate 2 and the lower slide plate 3. speed to ensure that each detection section of the filament bundle 11 is evenly stretched according to a predetermined mode. During the stretching process, the sensing mechanism monitors the stress conditions and displacement changes of each fixed point and the stretching section in real time, and calculates the tensile strength of each detection section based on the collected force and displacement data. Through the set standard threshold, it is judged whether the strength of the filament bundle 11 meets the expected requirements. When the filament bundle 11 reaches the predetermined maximum tensile force value, if the filament bundle 11 breaks, the filament bundle 11 fails to meet the strength requirements. On the contrary, if the filament bundle 11 does not break, it meets the qualified strength requirements. Through the detection of multiple sections, the tensile strength of the filament bundle 11 at different parts can be measured more accurately, which effectively avoids the problem of local stress concentration that may be caused by traditional single-point stretching and improves the accuracy of the test results.

[0033] See also Figure 1-Figure 4 As shown, self-locking components 8 are respectively provided between the upper movable plate 5 and the upper sliding plate 2, and between the lower movable plate 6 and the lower sliding plate 3, and blocks 12 are respectively provided on the frame 1 at the moving ends of the upper movable plate 5 and the lower movable plate 6. When the upper movable plate 5 and the lower movable plate 6 are respectively stopped by the corresponding blocks 12, the self-locking component 8 is automatically released from the fixed state, so that the upper sliding plate 2 and the lower sliding plate 3 can continue to move the stretched yarn bundle 11.

[0034] When the upper movable plate 5 and the upper sliding plate 2, as well as the lower movable plate 6 and the lower sliding plate 3 are fixed together by the self-locking component 8, the upper sliding plate 2 and the lower sliding plate 3 are relatively moved to stretch the wire bundle 11 section between the upper movable plate 5 and the lower movable plate 6 until it is stretched to a specified degree, that is, the upper movable plate 5 and the lower movable plate 6 are respectively stopped from moving by the corresponding stoppers 12. At this time, the wire bundle 11 section between the upper movable plate 5 and the lower movable plate 6 is stretched into place. If the wire bundle 11 is broken during this process, the wire bundle 11 fails to meet the specified strength requirement. When the upper movable plate 5 and the upper sliding plate 2, as well as the lower movable plate 6 and the lower sliding plate 3 are released from the fixed state by the self-locking component 8, the upper sliding plate 2 and the lower sliding plate 3 continue to move, and the upper movable plate 5 and the lower movable plate 6 stop moving due to the obstruction of the stopper 12, so that the wire bundle 11 section between the upper sliding plate 2 and the upper movable plate 5, as well as the wire bundle 11 section between the lower sliding plate 3 and the lower movable plate 6 are stretched until they are stretched to a specified degree.

[0035] See also Figure 1 and Figure 3-Figure 8 As shown, the self-locking assembly 8 includes a connector 81 disposed on the corresponding upper slide plate 2 and the lower slide plate 3, and the edges of the upper movable plate 5 and the lower movable plate 6 are respectively provided with a card interface for the corresponding connector 81 to be inserted therein.

[0036] At the beginning of the test, in order to first perform a strength test on the middle section of the yarn bundle 11, the connectors 81 on the upper slide plate 2 and the lower slide plate 3 are accurately inserted into the card interfaces on the edges of the upper movable plate 5 and the lower movable plate 6, forming a stable self-locking state, ensuring the relative fixation between the upper movable plate 5 and the lower movable plate 6 and the upper slide plate 2 and the lower slide plate 3, creating conditions for the separate stretching of the middle section of the yarn bundle 11. With the relative movement of the upper slide plate 2 and the lower slide plate 3, the middle section of the yarn bundle 11 begins to be stretched by force. In this process, due to the locking effect of the self-locking component 8, the upper movable plate 5 and the lower movable plate 6 move with the upper slide plate 2 and the lower slide plate 3. When the yarn bundle When the middle section of 11 is stretched to a predetermined degree, the upper movable plate 5 and the lower movable plate 6 encounter the stopper 12 provided on the frame 1 and stop moving. At this time, the self-locking assembly 8 is automatically released, allowing the connector 81 to detach from the card interface. The upper movable plate 5 and the lower movable plate 6 are no longer locked with the upper slide plate 2 and the lower slide plate 3, and their further movement is only restricted by the stopper 12. With the release of the self-locking assembly 8, the upper slide plate 2 and the lower slide plate 3 can continue to move, and the two end sections of the tow 11 are stretched and tested separately. At this time, the upper movable plate 5 and the lower movable plate 6 are stationary due to the obstruction of the stopper 12, thereby ensuring the independent and accurate detection of the two end sections.

[0037] See also Figure 3-Figure 6 As shown, a middle partition plate 13 is provided on the frame body 1 and between the upper movable plate 5 and the lower movable plate 6. When the upper movable plate 5 and the lower movable plate 6 are in contact with the middle partition plate 13, the filament bundle 11 is in an unstretched state.

[0038] On the frame 1 of the testing equipment, the middle partition 13 is located between the upper movable plate 5 and the lower movable plate 6, which serves as the reference position of the filament bundle 11 in the unstretched state. Before the test starts, the upper movable plate 5 and the lower movable plate 6 are contacted with the middle partition 13 through precise adjustment. This contact point indicates that the original unstretched length of the filament bundle 11 has been set, which provides a unified starting reference for subsequent stretching tests and improves the accuracy and comparability of test data.

[0039] See also Figure 3-Figure 6 As shown, the upper slide plate 2 and the lower slide plate 3 are both provided with a push plate 21 for pushing the corresponding upper movable plate 5 and the lower movable plate 6. When the push plate 21 contacts the corresponding upper movable plate 5 and the lower movable plate 6, the connector 81 is in an aligned state with the corresponding card interface.

[0040] After the inspection of the entire section of the yarn bundle 11 is completed, the upper sliding plate 2 and the lower sliding plate 3 are moved to push the upper movable plate 5 and the lower movable plate 6 under the action of the push plate 21, so that the upper movable plate 5 and the lower movable plate 6 return to the contact position with the middle partition plate 13 to facilitate the next inspection of the yarn bundle 11. After the upper movable plate 5 and the upper sliding plate 2, and the lower movable plate 6 and the push plate 21 of the lower sliding plate 3 are in contact, the connector 81 of the self-locking assembly 8 can be inserted into the corresponding card interface, so that the locking state between the upper sliding plate 2 and the lower sliding plate 3 and the upper movable plate 5 and the lower movable plate 6 is maintained in the initial state, so as to facilitate the initial tensile inspection of the middle section of the yarn bundle 11.

[0041] See also Figure 5-Figure 8 As shown, the plug-in component 81 has an inserting block 811 that can be inserted into the card interface, and a plug-in driver 82 that can drive the inserting block 811 to move.

[0042] When it is necessary to switch the detection stage of the yarn bundle 11, that is, from the locked state to the unlocked state, or vice versa, the plug-in driver 82 drives the plug block 811 to withdraw or insert from the card interface, thereby realizing precise control of the stretching of different sections and flexible conversion of the self-locking state during the detection of the yarn bundle 11, thereby improving the efficiency and accuracy of the detection.

[0043] See also Figure 7 and Figure 8 As shown, the plug block 811 has a guide rod 8111 extending outward along the opening direction of the card interface, and the upper slide plate 2 and the lower slide plate 3 are both provided with a guide sleeve 8112 for the corresponding guide rod 8111 to pass through, and a compression spring 8113 sleeved on the guide rod 8111 is fixedly connected between the guide sleeve 8112 and the plug block 811. When the plug block 811 is inserted into the card interface, the compression spring 8113 is in a state of not being acted upon by external force.

[0044] During the preparation stage, the compression spring 8113 is in a naturally relaxed state and is not compressed by external force, which means that a locking state is formed between the upper movable plate 5 and the lower movable plate 6 and the upper slide plate 2 and the lower slide plate 3. After the middle section of the wire bundle 11 is stretched to a predetermined degree and the upper movable plate 5 and the lower movable plate 6 touch the stop block 12 and stop moving, the plug-in driver 82 is triggered to cause the plug block 811 to withdraw from the card interface. As the plug block 811 withdraws, the compression spring 8113 is gradually compressed, and the locking relationship between the upper movable plate 5 and the lower movable plate 6 and the upper slide plate 2 and the lower slide plate 3 is released, allowing the upper slide plate 2 and the lower slide plate 3 to continue moving, so as to perform a tensile test on both ends of the wire bundle 11.

[0045] See also Figure 5-Figure 10As shown, the plug-in driver 82 has a lever 821 that can push the plug block 811 outward, and the upper slide plate 2 and the lower slide plate 3 both have an axle seat 822 for rotationally connecting one end of the corresponding lever 821. The other end of the lever 821 is provided with a slot along its length direction, and the plug block 811 has a protrusion 812 that can slide in the slot.

[0046] The plug-in driver 82 also has an electromagnetic driver for driving the lever 821 to rotate around the axis of the shaft seat 822. The electromagnetic driver has a fixed magnet 8221 and a movable magnet 8222. The fixed magnet 8221 is fixedly connected to the shaft seat 822, and the movable magnet 8222 is fixedly connected to the lever 821. Both the fixed magnet 8221 and the movable magnet 8222 are electromagnets. When both are energized, the fixed magnet 8221 repels the movable magnet 8222, thereby prompting the lever 821 to drive the plug-in block 811 to move. As the plug-in block 811 moves along the axial direction of the guide rod 8111, the plug-in block 811 can be inserted into or pulled out of the card interface, thereby realizing the plug-in action of the plug-in block 811.

[0047] See also Figure 2-Figure 7 As shown, the first positioning member 4 and the second positioning member 7 both have a wheel 41 on which the yarn bundle 11 can be wound, and a pressing block 42 for pressing the yarn bundle 11 onto the wheel 41 .

[0048] The pressing block 42 is driven by the cylinder 421, and the yarn bundle 11 is evenly wound on the wheel disc 41 of the first positioning member 4 and the second positioning member 7. The wheel disc 41 allows the yarn bundle 11 to be smoothly wound along its circumference. Compared with directly fixing the yarn bundle 11, the contact area between the yarn bundle 11 and the wheel disc 41 is increased, ensuring that the yarn bundle 11 remains in a stable state during the entire tensile test process and preventing the yarn bundle 11 from slipping at the fixed position. After the winding is completed, the pressing block 42 applies moderate pressure to the yarn bundle 11 and presses it tightly against the surface of the wheel disc 41, which not only prevents the yarn bundle 11 from sliding during the stretching process and reduces the measurement error caused by sliding, but also ensures that the friction between the yarn bundle 11 and the wheel disc 41 is large enough to remain fixed and not loose even when subjected to a large tensile force, thereby enhancing the reliability of the strength detection of the yarn bundle 11.

[0049] See also Figure 3-Figure 7 As shown, a limiting wheel 411 capable of keeping the yarn bundle 11 in a straight state between two adjacent wheel discs 41 is provided beside the wheel disc 41 of the second positioning member 7 .

[0050] The limiting wheel 411 is arranged on the side of the wheel 41 of the second positioning member 7. Its function is to ensure that the yarn bundle 11 maintains a straight state between two adjacent wheel discs 41 by lightly touching and guiding the yarn bundle 11 during the winding and stretching process of the yarn bundle 11. This helps to avoid unnecessary bending or twisting of the yarn bundle 11 when it is subjected to force, thereby reducing the detection error caused by the change in shape and improving the accuracy of the test results. Through the auxiliary positioning of the yarn bundle 11 by the limiting wheel 411, the yarn bundle 11 is subjected to more uniform force when stretched, avoiding local stress concentration, which is very important for evaluating the overall tensile strength and uniformity of the yarn bundle 11. Especially in multi-point detection, the limiting wheel 411 ensures that each section of the yarn bundle 11 can be tested under the same conditions, thereby enhancing the reliability of the data.

[0051] The present invention uses multi-point fixation and segmented stretching to stretch the sections of the filament bundle 11 between the upper movable plate 5 and the lower movable plate 6, as well as the sections between the upper movable plate 5 and the upper sliding plate 2, and between the lower movable plate 6 and the lower sliding plate 3. The overall strength of the filament bundle 11 is judged by determining whether each section of the filament bundle 11 is broken during the stretching process. This effectively avoids the problem of local stress concentration that may be caused by traditional single-point stretching, improves the accuracy of the test results, ensures a comprehensive evaluation of the entire length of the filament bundle 11, and is conducive to discovering potential strength unevenness problems.

[0052] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A polyester tow multi-point tensile strength testing device, arranged on a frame (1), the testing device comprising a stretching mechanism for stretching the tow (11), and a sensing mechanism for monitoring the stretching process of the tow (11); It is characterized in that The stretching mechanism comprises an upper slide plate (2) and a lower slide plate (3) capable of sliding on a frame (1), wherein the upper slide plate (2) and the lower slide plate (3) are respectively provided with a first positioning member (4) for fixing the end of the yarn bundle (11), and the stretching mechanism also comprises an upper movable plate (5) and a lower movable plate (6) capable of sliding on the frame (1), wherein the upper movable plate (5) and the lower movable plate (6) are respectively provided with a second positioning member (7) for the end of the yarn bundle (11) to pass through and fix the section close to the midpoint thereof; When the filament bundle (11) is stretched, the section of the filament bundle (11) between the upper movable plate (5) and the lower movable plate (6), and the section of the filament bundle (11) between the upper movable plate (5) and the upper sliding plate (2), and between the lower movable plate (6) and the lower sliding plate (3) are stretched; The upper movable plate (5) and the lower movable plate (6) are arranged between the upper slide plate (2) and the lower slide plate (3), the upper movable plate (5) being close to the upper slide plate (2), and the lower movable plate (6) being close to the lower slide plate (3); When the hydraulic system of the detection device is started, the upper slide plate (2) and the lower slide plate (3) slide outward along a preset straight line direction, and at the same time, the upper movable plate (5) and the lower movable plate (6) also move along the same straight line direction, and the movement speed of the upper movable plate (5) and the lower movable plate (6) is slower than the movement speed of the upper slide plate (2) and the lower slide plate (3); Self-locking components (8) are provided between the upper movable plate (5) and the upper sliding plate (2), and between the lower movable plate (6) and the lower sliding plate (3), respectively. Stoppers (12) are provided on the frame (1) at the ends of the movement of the upper movable plate (5) and the lower movable plate (6), respectively. When the upper movable plate (5) and the lower movable plate (6) are stopped by the corresponding stoppers (12), the self-locking components (8) are automatically released from the fixed state, so that the upper sliding plate (2) and the lower sliding plate (3) can continue to move to stretch the tow (11).

2. A polyester tow multi-point tensile strength testing device according to claim 1, characterized in that: The self-locking assembly (8) comprises a plug-in connector (81) arranged on the corresponding upper slide plate (2) and the lower slide plate (3), and the edges of the upper movable plate (5) and the lower movable plate (6) are respectively provided with a card interface for the corresponding plug-in connector (81) to be inserted therein.

3. A polyester tow multi-point tensile strength testing device according to claim 2, characterized in that: A middle partition plate (13) is provided on the frame body (1) and between the upper movable plate (5) and the lower movable plate (6); when the upper movable plate (5) and the lower movable plate (6) are in contact with the middle partition plate (13), the filament bundle (11) is in an unstretched state.

4. A polyester tow multi-point tensile strength testing device according to claim 3, characterized in that: The upper slide plate (2) and the lower slide plate (3) are both provided with a push plate (21) for pushing the corresponding upper movable plate (5) and the corresponding lower movable plate (6). When the push plate (21) contacts the corresponding upper movable plate (5) and the corresponding lower movable plate (6), the plug-in component (81) and the corresponding card interface are in an aligned state.

5. A polyester tow multi-point tensile strength testing device according to claim 4, characterized in that: The plug-in connector (81) has an insert block (811) that can be inserted into a card interface, and a plug-in driver (82) that can drive the insert block (811) to move.

6. A polyester tow multi-point tensile strength testing device according to claim 5, characterized in that: The insert block (811) has a guide rod (8111) extending outwardly along the opening direction of the card interface, and the upper slide plate (2) and the lower slide plate (3) are both provided with a guide sleeve (8112) for the corresponding guide rod (8111) to pass through, and a compression spring (8113) sleeved on the guide rod (8111) is fixedly connected between the guide sleeve (8112) and the insert block (811), and when the insert block (811) is inserted into the card interface, the compression spring (8113) is in a state of not being acted upon by external force.

7. The polyester tow multi-point tensile strength testing device according to claim 5, characterized in that: The plug-in driver (82) has a lever (821) capable of shifting the plug block (811) outward, and the upper slide plate (2) and the lower slide plate (3) each have a shaft seat (822) for rotationally connecting one end of the corresponding lever (821), the other end of the lever (821) is provided with a slot along its length direction, and the plug block (811) has a protrusion (812) capable of sliding in the slot.

8. The polyester tow multi-point tensile strength testing device according to claim 1, characterized in that: The first positioning member (4) and the second positioning member (7) both have a wheel disc (41) on which the yarn bundle (11) can be wound, and a pressing block (42) for pressing the yarn bundle (11) onto the wheel disc (41).

9. A polyester tow multi-point tensile strength testing device according to claim 8, characterized in that: A limiting wheel (411) capable of keeping the yarn bundle (11) in a straight state between two adjacent wheel discs (41) is provided beside the wheel disc (41) of the second positioning member (7).

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