A device for detecting the tensile strength of chemical staple fibers

Abstract

The application discloses a kind of for chemical short fiber tensile strength detection device, belong to mechanics sensor technical field.In the application, by a plurality of from inside to outside sequentially coaxial embedding traction disc and fixed disc, when carrying out the tensile test of different material, different linear density single short fiber or large bundle fiber, tester will be mounted in the top of the traction disc of corresponding target range switching mechanism, when traction platform moves, can pull connecting ring, connecting ring only through switching mechanism to accurately transmit tension to specific bottom traction disc, the traction disc under stress in turn pulls its exclusive shear beam to occur microscopic elastic deformation, by the mechanics sensor of optimization design, when the short fiber of different intensity is stretched, can select the reasonable force measurement interval of adaptation, reach optimal detection accuracy and signal-to-noise ratio.

Description

Technical Field

[0001] This invention belongs to the field of mechanical sensor technology, and in particular relates to a device for detecting the tensile strength of chemical short fibers. Background Technology

[0002] Chemical fibers, especially nylon 6 cotton-type staple fiber, are widely used in the textile blending field due to their excellent abrasion resistance, resilience and cotton-like feel. In the production and quality control of nylon 6 staple fiber, tensile strength (breaking strength) and elongation at break are the core indicators for measuring its physical and mechanical properties.

[0003] Nylon 6 cotton-type staple fiber is characterized by its small single fiber fineness, short length, and easy crimping. In actual testing, R&D and quality control departments need to test both the minute tensile force of a single staple fiber and the larger tensile force of staple fiber bundles or fibers with different linear density specifications. Existing single yarn / staple fiber tensile testing instruments are usually only equipped with force sensors with a fixed range. If a large-range sensor is used to test a single fine fiber, the signal-to-noise ratio will not be able to guarantee the detection accuracy. If a small-range sensor is to be replaced, the machine needs to be stopped, the fixture disassembled, and recalibrated, which is time-consuming and labor-intensive and seriously affects the efficiency of batch testing. Therefore, there is room for improvement. Summary of the Invention

[0004] The purpose of this invention is to provide a device for testing the tensile strength of chemical short fibers in order to solve the problem that fixed-range force sensors affect the efficiency of batch testing.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A device for testing the tensile strength of chemical short fibers includes a cabinet and a traction platform slidably connected to the top of the cabinet. The traction platform is moved by a longitudinal drive unit. The device also includes:

[0007] Two spoke sensor units are respectively connected to the traction platform and the opposite surfaces of the top of the cabinet cavity;

[0008] A force measuring unit, wherein multiple force measuring units are nested in an array from the inside out in the inner cavity of the spoke sensor unit, and each spoke sensor unit has a connecting ring slidably connected to its inner cavity, and the top of the connecting ring has a threaded portion for connecting to the traction clamp;

[0009] A switching mechanism is connected to the top of the connecting ring. The switching mechanism is configured to selectively connect to the force measuring unit at the corresponding position through a switching action to adjust the force measuring stroke.

[0010] A guiding mechanism, connected to the bottom of the force measuring unit, is used to guide the wiring harnesses of the multiple force measuring units outward.

[0011] As a further description of the above technical solution:

[0012] The force measuring unit includes a traction disc and a fixed disc with their axes opposite each other;

[0013] The top of the traction disc is movably connected to the switching mechanism at the corresponding position, the fixed disc is connected to the top of the support disc inside the spoke sensor unit, and the support disc is connected to the top of the guide mechanism;

[0014] Multiple shear beams are connected around the traction disc and the fixed disc along the axis. The two ends of the shear beams are respectively connected to the opposite side of the traction disc and the fixed disc. The shear beams have inclined surfaces, and strain gauges are connected to the top of the inclined surfaces. The strain gauges extend to the guide mechanism through wire harnesses.

[0015] As a further description of the above technical solution:

[0016] Also includes:

[0017] A limiting clamping ring is connected to the end of the corresponding switching groove at the top of the force-bearing part. The limiting clamping ring has an opening for the traction rod to move in. Clamping blocks are connected to both sides of the inner cavity of the limiting clamping ring to limit the traction rod.

[0018] Elastic pads, wherein a plurality of elastic pads are arranged in a ring between the traction disc and the fixing disc, and the elastic point is a flexible plastic pad.

[0019] As a further description of the above technical solution:

[0020] The switching mechanism further includes:

[0021] A force-bearing part is symmetrically arranged at the top of the connecting ring. Multiple arc-shaped switching grooves are opened on the force-bearing part. The traction rod is slidably connected in the switching groove. A locking block is connected to the bottom end of the traction rod.

[0022] The number of card holders corresponds to the number of switching slots, and the card holders are connected to the top of the traction disc. The card holders have stepped grooves for limiting and locking the card block after the traction rod slides.

[0023] As a further description of the above technical solution:

[0024] The top of the traction rod extends to the outside of the switching slot and is connected to a handle. The traction rod is driven to switch connections by moving the handle.

[0025] As a further description of the above technical solution:

[0026] The outer periphery of the card block is connected with multiple protrusions along the axis to increase the limiting and fastening between it and the card seat.

[0027] As a further description of the above technical solution:

[0028] The guiding mechanism includes:

[0029] A guide seat is connected to the bottom of the inner cavity of the spoke sensor unit, and rotating rods are rotatably connected to all four sides of the guide seat;

[0030] A wire hole is provided at the end of the inner cavity of the guide seat to sort and lead out the wires of different force measuring units.

[0031] As a further description of the above technical solution:

[0032] The guide seat has a cross-shaped cross section and is aligned with the axis of the inner cavity of the spoke sensor unit.

[0033] As a further description of the above technical solution:

[0034] The guiding mechanism also includes a rotating frame rotatably connected to the middle of the inner cavity of the guide seat. The outer sides of the rotating frame are each connected to a first buffer ring for guiding the wire harness of the force measuring unit to smoothly transition between different chambers.

[0035] As a further description of the above technical solution:

[0036] The rotating rod is connected to two second buffer rings on both sides of its exterior, which restrict the wiring harness of the force measuring unit.

[0037] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0038] 1. In this invention, multiple traction discs and fixed discs are coaxially nested from the inside out. When conducting tensile tests on single short fibers or large bundles of fibers of different materials and linear densities, the tester attaches the switching mechanism to the top of the traction disc corresponding to the target range. When the traction platform moves, it can pull the connecting ring. The connecting ring accurately transmits the tensile force to the specific bottom traction disc only through the switching mechanism. The traction disc under force then pulls its dedicated shear beam to undergo micro-elastic deformation. This allows the equipment to select an appropriate and reasonable force measurement range when tensile short fibers of different strengths, achieving the optimal detection accuracy and signal-to-noise ratio.

[0039] 2. In this invention, when the traction rod switches gears in the arc-shaped switching groove, the locking block at the bottom of the traction rod can slide into the locking seat opening at the top of the corresponding range traction disc. When the connecting ring is pulled by the traction platform, the pulling force is transmitted to the traction disc without loss, pulling the bottom shear beam. The strain gauge attached to the inclined surface of the shear beam undergoes shear deformation under stress to output the traction force curve. The measurement stroke can be quickly switched by moving multiple traction rods, improving the adaptability. The clutch design, which allows for independent operation and no interference, simplifies internal disturbances.

[0040] 3. In this invention, a specially designed bottom guide mechanism is used to eliminate the influence of wire harness mechanical resistance on the stability of force measurement. The wire harnesses led out from the strain gauges in multiple force measurement units pass vertically downward through their respective support plates and extend to the corresponding quadrant chamber of the cross-shaped guide seat directly below, achieving physical isolation of wire harnesses of each range. When the wire harness is led outward, it is not pulled directly, but passes through the rotating frame in the middle of the guide seat cavity in sequence and goes around the rotating rods around it. Since the rotating frame and both sides of the rotating rods are equipped with rounded first and second buffer rings, the wire harness can move smoothly from one side to the other side along the arc of the first buffer ring and finally be discharged to the outside through the wire hole, avoiding the tangling and knotting between multiple sets of wire harnesses and ensuring stability under micro-force testing. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the overall structure of a chemical short fiber tensile strength testing device proposed in this invention.

[0042] Figure 2 This is a schematic diagram of the side structure of a chemical short fiber tensile strength testing device proposed in this invention;

[0043] Figure 3 This is a schematic diagram of the transverse cross-sectional structure of a chemical short fiber tensile strength testing device proposed in this invention;

[0044] Figure 4 The present invention proposes Figure 3 Enlarged structural diagram of part A in the middle;

[0045] Figure 5 This is a schematic diagram of the disassembled structure of a chemical short fiber tensile strength testing device proposed in this invention;

[0046] Figure 6 The present invention proposes Figure 5 Enlarged structural diagram of section B;

[0047] Figure 7 This is a schematic diagram of the force measuring unit structure of a chemical short fiber tensile strength testing device proposed in this invention;

[0048] Figure 8 The present invention proposes Figure 7 Enlarged structural diagram of section C;

[0049] Figure 9 This is a schematic diagram of a switching mechanism structure for a chemical short fiber tensile strength testing device proposed in this invention;

[0050] Figure 10 This is a schematic diagram of the guide mechanism structure of a chemical short fiber tensile strength testing device proposed in this invention.

[0051] Legend:

[0052] 1. Cabinet; 2. Wheel spoke sensor unit; 3. Traction platform; 4. Force measuring unit; 401. Traction disc; 402. Fixing disc; 403. Elastic pad; 404. Shear beam; 405. Strain gauge; 5. Guiding mechanism; 501. Guide seat; 502. Rotating frame; 503. First buffer ring; 504. Rotating rod; 505. Second buffer ring; 506. Threading hole; 6. Switching mechanism; 601. Force-bearing part; 602. Switching groove; 603. Traction rod; 604. Limiting clamp; 605. Clamping block; 606. Locking block; 607. Locking seat; 608. Stepped groove; 7. Connecting ring; 8. Traction clamp; 9. Support disc. Detailed Implementation

[0053] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] Please see Figures 1-10 The present invention provides a technical solution: a device for testing the tensile strength of chemical short fibers, comprising a cabinet 1 and a traction platform 3 slidably connected to the top of the cabinet 1, the traction platform 3 being moved by a longitudinal drive unit, and further comprising:

[0055] Two spoke sensor units 2 are respectively connected to the opposite surfaces of the top of the traction platform 3 and the cabinet 1.

[0056] Force measuring unit 4, multiple force measuring units 4 are nested in an array from the inside to the outside in the inner cavity of the spoke sensor unit 2, and each spoke sensor unit 2 has a connecting ring 7 slidably connected to its inner cavity, and the top of the connecting ring 7 is provided with a threaded part for connecting the traction clamp 8.

[0057] The switching mechanism 6 is connected to the top of the connecting ring 7. The switching mechanism 6 is configured to connect to the force measuring unit 4 at the corresponding position through a switching action to adjust the force measuring stroke.

[0058] The guide mechanism 5 is connected to the bottom of the force measuring unit 4 and is used to guide the wire harnesses of multiple force measuring units 4 outward.

[0059] Within each spoke sensor unit 2, multiple force measuring units 4 of varying sizes are coaxially arrayed and nested from the inside out. For example, the inner ring has a 10N range, the middle ring has a 50N range, and the outer ring has a 200N range.

[0060] Force measuring unit 4 includes a traction disc 401 and a fixed disc 402 with their axes opposite each other;

[0061] The top of the traction disc 401 is movably connected to the corresponding switching mechanism 6, the fixed disc 402 is connected to the top of the support disc 9 inside the spoke sensor unit 2, and the support disc 9 is connected to the top of the guide mechanism 5;

[0062] Multiple shear beams 404 are connected around the traction plate 401 and the fixed plate 402 along the axis. The two ends of the shear beams 404 are connected to the opposite side of the traction plate 401 and the fixed plate 402, respectively. The shear beams 404 have inclined surfaces, and strain gauges 405 are connected to the top of the inclined surfaces. The strain gauges 405 extend to the guide mechanism 5 through wire harnesses.

[0063] Also includes:

[0064] A limiting clamping ring 604 is connected to the top of the force-receiving part 601, corresponding to the end of the switching groove 602. The limiting clamping ring 604 has an opening for the traction rod 603 to move in. Clamping blocks 605 are connected to both sides of the inner cavity of the limiting clamping ring 604, and the traction rod 603 is limited by the clamping blocks 605.

[0065] Elastic pads 403, multiple elastic pads 403 are arranged around the traction disc 401 and the fixed disc 402, and the elastic point is a flexible plastic pad.

[0066] Specifically, a stepped measurement range is constructed by using multiple coaxially nested traction discs 401 and fixed discs 402 arranged from the inside out. When conducting tensile tests on single short fibers or large bundles of fibers of different materials and linear densities, the tester attaches the switching mechanism 6 to the top of the traction disc 401 corresponding to the target measurement range. When the traction platform 3 moves, it can pull the connecting ring 7. The connecting ring 7 precisely transmits the tension to a specific bottom traction disc 401 only through the switching mechanism 6. The other unselected traction discs 401 remain in a free unloading state. The tensioned traction disc 401 then pulls its dedicated shear beam 404 to undergo micro-elastic deformation, so that the equipment selects an appropriate and reasonable force measurement range when tensile short fibers of different strengths, ensuring that the test value is always within the optimal linear range of 20%-80% of the sensor's measurement range, achieving the best detection accuracy and signal-to-noise ratio.

[0067] Furthermore, the traction disc 401 and the fixed disc 402 of the multiple force measuring units 4 are all in a concentric ring structure. When the multiple force measuring units 4 are nested in a coaxial array from the inside to the outside, a radial clearance gap is reserved between the ring sidewalls of adjacent force measuring units 4.

[0068] In actual testing, when the traction disc 401 of a certain range is subjected to force and produces microscopic longitudinal displacement (i.e., the shear beam 404 deforms), thanks to the radial clearance, the stressed traction disc 401 and its accessories will not have physical friction with the adjacent inner or outer rings, ensuring "zero frictional hysteresis" in the mechanical transmission process and guaranteeing the absolute accuracy of the strain gauge 405 detection signal.

[0069] The end face of the connecting ring 7 is symmetrically provided with force-receiving parts 601. Multiple arc-shaped switching grooves 602 corresponding to the force measuring unit 4 are opened on the force-receiving parts 601. The traction rod 603 can slide smoothly in the switching grooves 602 through the handle at the top.

[0070] When the operator holds the handle and slides the corresponding positions of the traction rods 603 on both sides to switch gears in the arc-shaped switching groove 602, the locking block 606 at the bottom of the traction rod 603 can slide into the opening of the locking seat 607 at the top of the corresponding range traction disc 401. In order to prevent accidental disengagement during the test, the protrusions on the outer side of the locking block 606 generate frictional damping with the inner wall of the locking seat 607, and then lock into the stepped groove 608 to complete the vertical limit.

[0071] Meanwhile, the limiting clamps 604 on both sides of the switching slot 602 use clamps 605 to radially lock the traction rod 603, and the force-bearing part 601 forms a rigid connection with the target traction disc 401. As the connecting ring 7 is pulled by the traction platform 3, the tension is transmitted to the traction disc 401 without loss, causing the shear beam 404 between it and the fixed disc 402 to be subjected to longitudinal shear force. The strain gauge 405 attached to the inclined surface of the shear beam 404 undergoes shear deformation under stress. The physical deformation of the strain gauge 405 is converted into a change in resistance. The control system can then calculate and output the traction force curve in real time and with high precision.

[0072] Switching mechanism 6 also includes:

[0073] A force-receiving part 601 is symmetrically arranged at the top of the connecting ring 7. Multiple arc-shaped switching grooves 602 are provided on the force-receiving part 601. The traction rod 603 is slidably connected in the switching groove 602. A locking block 606 is connected to the bottom end of the traction rod 603.

[0074] Card holder 607, the number of card holders 607 corresponds to the number of switching slots 602, and the card holder 607 is connected to the top of the traction disc 401. The card holder 607 has a stepped groove 608, which is used to limit and lock the card block 606 after the traction rod 603 slides.

[0075] The top of the traction rod 603 extends to the outside of the switching slot 602 and is connected to a handle. The traction rod 603 is driven to switch the connection by moving the handle.

[0076] The outer periphery of the card block 606 is connected with multiple protrusions along the axis to increase the limiting and fastening between it and the card holder 607.

[0077] Furthermore, the switching mechanism 6 is equipped with multiple traction rods 603, and the force-bearing part 601 is provided with multiple switching grooves 602 distributed in a concentric arc shape. The arc trajectory of each switching groove 602 corresponds perpendicularly to the top of the corresponding range traction disk 401 below. When switching the range, the movement trajectory of the traction rod 603 does not cross the rings of different ranges. The tester only needs to select the target range according to the specification requirements of the nylon 6 short fiber to be tested, and slide the dedicated traction rod 603 above the target ring along its arc-shaped switching groove 602, so that the bottom locking block 606 slides into the corresponding locking seat 607 of the traction disk 401 to achieve mechanical locking. The other traction rods 603 that are not corresponding to the target range are all placed at the unlocking end of the corresponding switching groove 602, and remain detached from the traction disk 401 below. The clutch-type design of independent operation and non-interference simplifies internal disturbance.

[0078] In a multi-range nested structure, if the strain gauge 405 wire harness is not handled properly, parasitic forces will be generated, which will seriously affect the testing accuracy of small ranges. This problem is solved by the guide mechanism 5.

[0079] Guiding organization 5 includes:

[0080] The guide seat 501 is connected to the bottom of the inner cavity of the spoke sensor unit 2. Rotary rods 504 are rotatably connected to all four sides of the guide seat 501.

[0081] A wire hole 506 is provided at the end of the inner cavity of the guide seat 501 and is used to sort and lead out the wire harnesses of different force measuring units 4.

[0082] The guide seat 501 has a cross-shaped cross section, and the guide seat 501 is opposite to the axis of the inner cavity of the spoke sensor unit 2;

[0083] The guiding mechanism 5 also includes a rotating frame 502 rotatably connected to the middle of the inner cavity of the guide seat 501. The outer sides of the rotating frame 502 are connected to a first buffer ring 503, which is used to guide the wire harness of the force measuring unit 4 to smoothly transition between different chambers.

[0084] The rotating rod 504 has a second buffer ring 506 connected to both sides of its outer side, which restricts the wiring harness of the force measuring unit 4.

[0085] Specifically: Through the specially designed guide mechanism 5 at the bottom, the influence of the mechanical resistance of the wire harness on the stability of the force measurement is eliminated. The wire harnesses led out from the strain gauges 405 in multiple force measurement units 4 pass vertically downward through their respective support plates 9 and extend to the corresponding quadrant chamber of the cross-shaped guide seat 501 directly below, realizing the physical isolation of the wire harnesses of each range. When the wire harness is led outward, it is not pulled directly, but passes through the rotating frame 502 in the middle of the inner cavity of the guide seat 501 in sequence and goes around the rotating rods 504 around it. Since the rotating frame 502 and the rotating rods 504 are equipped with rounded first buffer rings 503 and second buffer rings 505 on both sides, the wire harness can move smoothly from one side to the other side along the arc of the first buffer ring 503, and finally exit from the wire hole 506 to the outside, avoiding the tangling and knotting between multiple sets of wire harnesses and ensuring stability under micro-force testing.

[0086] The elastic pads 403 and shear beams 404 are arranged around the axis between the traction disc 401 and the fixed disc 402. Specifically, multiple elastic pads 403 and multiple shear beams 404 are staggered in the circumferential direction (i.e., each elastic pad 403 is located between two adjacent shear beams 404), providing the traction disc 401 with uniform initial reset elastic force and deformation damping around the circumference, preventing irreversible overload damage to the strain gauge 405 caused by sudden load change at the moment of tensile fracture.

[0087] Working principle: When in use, the operator estimates the required tensile force range according to the specifications of the nylon 6 cotton-type short fiber to be tested. The operator pulls the corresponding traction rod 603 according to the preset stroke. When the corresponding traction rod 603 slides in the arc-shaped switching groove 602 of the force-bearing part 601, it can slide into the corresponding card seat 607.

[0088] When the guide rod slides to the position corresponding to the target range, the locking block 606 at the bottom of the traction rod 603 will slide into the opening of the locking seat 607 at the top of the target traction disc 401. The protrusions on the periphery of the locking block 606 increase the frictional resistance. Then the locking block 606 slides into the stepped groove 608 to complete the vertical limit. The limiting clamping rings 604 on both sides of the switching groove 602 firmly clamp the traction rod 603 through the clamping block 605.

[0089] At this time, the connecting ring 7 forms a rigid mechanical connection only with the traction disc 401 of the force measuring unit 4 of this specific range, while it is in a disengaged state from other nested force measuring units 4, thus completing the range selection at the physical level.

[0090] The two ends of the nylon 6 short fiber are fixed to the traction clamps 8 of the upper cabinet 1 and the lower traction platform 3, respectively. The longitudinal drive unit is started, which drives the lower traction platform 3 to move downward at a uniform linear speed, applying a tensile load to the short fiber.

[0091] Under tension, the traction disc 401 of this specific range undergoes a small longitudinal displacement relative to the fixed disc 402, and the multiple shear beams 404 connected between the two undergo elastic shear deformation. The surrounding elastic pads 403 provide stable deformation damping during this process and assist in rapid reset after the test.

[0092] The strain gauge 405, attached to the top of the inclined surface of the shear beam 404, senses this tiny deformation. Its resistance value changes regularly, converting the mechanical deformation into an electrical signal, which is transmitted to the external control system to calculate the precise tensile force value.

[0093] The wire harnesses leading from each force measuring unit 4 first pass through the corresponding support plate 9 and enter the different chambers of the cross-shaped guide seat 501, achieving primary physical isolation. As the wire harnesses extend outward, they pass through the rotating frame 502 in the center of the guide seat 501 and the rotating rods 504 around it. The first buffer ring 503 and the second buffer ring 505 on the rotating frame 502 and the rotating rods 504 are made of smooth or flexible materials. When there is slight vibration of the machine or when the equipment is being maintained, the wire harnesses can smoothly transition along the curvature of the first buffer ring 503, avoiding dead knots between the wire harnesses or reverse pulling force on the shear beam 404, and completely eliminating the interference of wire harness stress on the test accuracy.

[0094] In this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0095] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for testing the tensile strength of chemical short fibers, comprising a cabinet (1) and a traction platform (3) slidably connected to the top of the cabinet (1), the traction platform (3) being moved by a longitudinal drive unit, characterized in that, Also includes: Two spoke sensor units (2) are respectively connected to the opposite surfaces of the top of the traction platform (3) and the cabinet (1); Force measuring unit (4), multiple force measuring units (4) are nested in the inner cavity of the spoke sensor unit (2) from the inside out. Each spoke sensor unit (2) has a connecting ring (7) slidably connected to its inner cavity. The top of the connecting ring (7) is provided with a threaded part for connecting the traction clamp (8). A switching mechanism (6) is connected to the top of the connecting ring (7). The switching mechanism (6) is configured to connect to the force measuring unit (4) at the corresponding position through a switching action to adjust the force measuring stroke. A guiding mechanism (5) is connected to the bottom of the force measuring unit (4) and is used to guide the wire harnesses of the multiple force measuring units (4) outward; The force measuring unit (4) includes a traction disc (401) and a fixed disc (402) with their axes opposite each other. The top of the traction disc (401) is movably connected to the switching mechanism (6) at the corresponding position, the fixed disc (402) is connected to the top of the support disc (9) inside the spoke sensor unit (2), and the support disc (9) is connected to the top of the guide mechanism (5). Multiple shear beams (404) are connected around the traction disc (401) and the fixed disc (402) along the axis. The two ends of the shear beams (404) are respectively connected to the opposite side of the traction disc (401) and the fixed disc (402). The shear beams (404) have inclined surfaces, and strain gauges (405) are connected to the top of the inclined surfaces. The strain gauges (405) extend to the guide mechanism (5) through wire harnesses. Also includes: A limiting clamping ring (604) is connected to the top of the force-receiving part (601) corresponding to the end of the switching groove (602). The limiting clamping ring (604) has an opening for the traction rod (603) to move in. Clamping blocks (605) are connected to both sides of the inner cavity of the limiting clamping ring (604) to limit the traction rod (603). Elastic pad (403), multiple elastic pads (403) are arranged around the traction disc (401) and the fixed disc (402), the elastic pad (403) is a flexible plastic pad; The switching mechanism (6) further includes: A force-receiving part (601) is symmetrically arranged at the top of the connecting ring (7). Multiple arc-shaped switching grooves (602) are opened on the force-receiving part (601). The traction rod (603) is slidably connected in the switching groove (602). A locking block (606) is connected to the bottom end of the traction rod (603). Card holder (607), the number of card holders (607) corresponds to the number of switching slots (602), and the card holder (607) is connected to the top of the traction disc (401). The card holder (607) has a stepped groove (608) for limiting and locking the card block (606) after the traction rod (603) slides.

2. The device for testing the tensile strength of chemical short fibers according to claim 1, characterized in that, The top of the traction rod (603) extends to the outside of the switching slot (602) and is connected to a handle. The traction rod (603) is driven to switch connections by moving the handle.

3. The device for testing the tensile strength of chemical short fibers according to claim 1, characterized in that, The outer periphery of the card block (606) is connected with multiple protrusions along the axis to increase the limiting and fastening between it and the card seat (607).

4. The device for testing the tensile strength of chemical short fibers according to claim 1, characterized in that, The guiding mechanism (5) includes: The guide seat (501) is connected to the bottom of the inner cavity of the spoke sensor unit (2), and the guide seat (501) is rotatably connected with rotating rods (504) around its perimeter. A wire hole (506) is provided at the end of the inner cavity of the guide seat (501) for sorting and leading out the wires of different force measuring units (4).

5. The device for testing the tensile strength of chemical short fibers according to claim 4, characterized in that, The guide seat (501) has a cross-shaped cross section and is opposite to the inner axis of the spoke sensor unit (2).

6. The device for testing the tensile strength of chemical short fibers according to claim 4, characterized in that, The guiding mechanism (5) also includes a rotating frame (502) rotatably connected to the middle of the inner cavity of the guide seat (501). The rotating frame (502) has a first buffer ring (503) connected to both sides of its outer side to guide the wire harness of the force measuring unit (4) to smoothly transition between different chambers.

7. The device for testing the tensile strength of chemical short fibers according to claim 4, characterized in that, The rotating rod (504) is connected to two outer sides by a second buffer ring (505), which restricts the wire harness of the force measuring unit (4).

Images