Special fixture for testing tensile strength of aramid fabric

Abstract

The utility model relates to a special fixture for testing the tensile strength of aramid fiber cloth, and belongs to the technical field of aramid fiber cloth testing. Comprising a tape winding shaft, a clamp seat and a connector connected with the clamp seat, the clamp seat is provided with a left clamping arm and a right clamping arm which are parallel to each other, and one end of the tape winding shaft penetrates through the left clamping arm and is connected with a first rotation stopping device on the outer wall of the left clamping arm; the other end of the belt winding shaft penetrates through the right clamping arm and is connected with a second rotation stopping device on the outer wall of the right clamping arm, a non-through belt penetrating groove is formed in the length direction of the belt winding shaft, the upper end and the lower end of the outer protection plate are bent to form a top plate and a bottom plate respectively, and the upper fixing plate is installed on the outer wall of the left clamping arm through an upper fixing bolt. And the vertical plate is inserted into a tape threading groove at the end part of the tape winding shaft. The utility model has the beneficial effects that the integral rigidity is good, the connection strength is high, the load transmitted by the tape winding shaft to the vertical plate can be resisted, and the rotation of the tape winding shaft relative to the clamp seat is limited. And the clamping and unlocking efficiency of the detected object can be greatly improved.

Description

Technical Field

[0001] The utility model relates to a special fixture for testing the breaking strength of aramid cloth, belonging to the technical field of aramid cloth testing. Background Art

[0002] Aramid fiber, an emerging material, is gradually being used in conveyor belts due to its low density, high strength, high modulus, low elongation, low creep rate, and excellent thermal stability. Conveyor belts made with aramid as the backbone exhibit excellent impact and tear resistance, stable operation, low elongation, light weight, and good troughing properties. Compared to steel cord conveyor belts, aramid fiber effectively addresses the issues of poor tear resistance, poor water and corrosion resistance, and poor bending fatigue resistance. Compared to similar steel cord conveyor belts, aramid fiber is 35-45% lighter, effectively reducing conveyor energy consumption. Aramid conveyor belts are energy-saving conveyor belts with promising development prospects.

[0003] In order to ensure the quality and performance of aramid cloth, it is necessary to conduct tensile strength tests on it to evaluate its load-bearing capacity and reliability in actual use.

[0004] Patent No. 202410361343.4 discloses a method and apparatus for testing the tensile strength of aramid fiber-reinforced wrapping tape. The tensile assembly comprises a pulley bracket, a pulley plate detachably mounted on the pulley bracket, and a pulley rotatably mounted on the pulley bracket and the pulley plate. The pulley bracket is slidably mounted on a pressure support platform via a tensile drive screw spline. The pressure support platform is mounted on a support pull ring via four measuring sections. An angle adjustment assembly is provided below the tensile assembly. The angle adjustment assembly comprises a rotating pulley bracket symmetrically arranged with respect to the pulley bracket and a rotating pulley plate symmetrically arranged with respect to the pulley plate. The rotating pulley plate and the rotating pulley bracket are also detachably engaged. Rotating pulleys symmetrically mounted with respect to the pulley bracket and the rotating pulley plate are rotatably mounted on the rotating pulley bracket and the rotating pulley plate. The wrapping tape is sleeved over the rotating pulley and the pulley, and high-temperature lamps are provided around the wrapping tape to increase the ambient temperature.

[0005] The current technology is not comprehensive and has the following disadvantages: the clamping method of the object to be inspected is cumbersome and inefficient. For aramid cloth with a large inspection volume, it will seriously affect the inspection progress and thus affect production efficiency; the overall rigidity of the fixture is poor and the connection strength is low.

[0006] In order to solve one of the above problems, a special fixture for testing the breaking strength of aramid cloth is urgently needed. Utility Model Content

[0007] In view of the above deficiencies in the prior art, the technical problem to be solved by the present invention is: how to improve the efficiency of clamping and unlocking the winding shaft and the object to be tested, and to this end provide a special fixture for testing the breaking strength of aramid cloth.

[0008] The harness is pivotally connected to the left side panel and the strap is secured to the bottom panel with an angular channel formed between the end panels and the strap, and the strap is secured to the bottom panel with an angular channel formed between the end panels.

[0009] The special fixtures are set up in pairs and connected to the two ends of the aramid cloth to be tested. Both sets of special fixtures are installed on the same set of tensile testers. The process of connecting the aramid cloth to be tested with the special fixtures is as follows:

[0010] First, release the restriction of the second anti-rotation device on the winding shaft, then move the winding shaft horizontally so that the winding shaft is separated from the vertical plate of the first anti-rotation device, and release the restriction of the first anti-rotation device on the winding shaft. Secondly, pass the end of the aramid cloth to be tested through the belt threading groove, and rotate the winding shaft relative to the clamp seat. As the winding shaft rotates, part of the aramid cloth is wound on the winding shaft, so that one end of the aramid cloth is pressed against the outer wall of the winding shaft, and one end of the aramid cloth can be fixed on the winding shaft.

[0011] Finally, the tape winding shaft is moved laterally so that the vertical plate is inserted into the tape threading groove at the end of the tape winding shaft again, limiting the rotation of the tape winding shaft relative to the fixture seat, and at the same time, the second anti-rotation device is used again to lock the tape winding shaft, which can greatly improve the clamping and unlocking efficiency of the object to be tested.

[0012] Preferably, the left clamp arm is provided with an upper threaded hole threadedly connected to the upper fixing bolt, and a lower threaded hole threadedly connected to the lower fixing bolt. Simply machining two sets of threaded holes on the clamp base and using the existing fixing bolts allows for the detachable installation of the upper and lower fixing plates, enabling quick installation of the first anti-rotation device.

[0013] Preferably, the first anti-rotation device includes an axial end disc coaxially connected to the tape winding shaft, the outer diameter of the axial end disc is larger than the outer diameter of the tape winding shaft, a positioning plate is vertically connected to the outer end surface of the axial end disc, the plane where the positioning plate is located is perpendicular to the plane where the tape threading groove is located, and also includes a locking pin and a limit plate fixed to the outer wall of the right clamp arm, the cap body of the locking pin is supported on the upper surface of the limit plate, and the bolt body of the locking pin passes through the upper through hole on the limit plate and the lower through hole on the positioning plate in sequence. When the vertical plate is inserted into the tape threading groove at the end of the tape winding shaft again, the first anti-rotation device can lock the tape winding shaft, and the second anti-rotation device can lock or unlock the tape winding shaft by inserting and removing the locking pin. The second anti-rotation device locks the tape winding shaft and can prevent the tape winding shaft from moving laterally relative to the clamp seat.

[0014] Preferably, the clamp seat is integrally formed with the left clamp arm and the right clamp arm.

[0015] Preferably, the length of the tape threading groove is 5 / 6-1 / 10 of the length of the tape winding shaft.

[0016] Preferably, the cross section of the tape winding shaft is circular, and a circular hole for the tape winding shaft to pass through is respectively opened on the left clamping arm and the right clamping arm, and the inner diameter of the circular hole is slightly larger than the outer diameter of the tape winding shaft.

[0017] Preferably, the connecting head is connected to the clamp seat by welding.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The special fixture for testing the breaking strength of aramid cloth described in the utility model has a vertical plate connected vertically between the top plate and the bottom plate, the side edges of the vertical plate are vertically connected to the inner wall of the outer guard plate, and the outer guard plate, top plate and bottom plate are respectively enclosed on three groups of side edges of the vertical plate. The overall rigidity is good and the connection strength is high, which is sufficient to resist the load transmitted to the vertical plate by the winding belt axis and limit the rotation of the winding belt axis relative to the fixture seat.

[0020] The special fixture for testing the breaking strength of aramid cloth described in the utility model is characterized in that the end of the aramid cloth to be tested is passed through the belt threading groove, and the belt winding shaft is rotated relative to the fixture seat. As the belt winding shaft rotates, part of the aramid cloth is wound on the belt winding shaft, so that one end of the aramid cloth is pressed against the outer wall of the belt winding shaft, and the one end of the aramid cloth can be fixed on the belt winding shaft. The belt winding shaft is then moved horizontally so that the vertical plate is inserted into the belt threading groove at the end of the belt winding shaft again, thereby limiting the rotation of the belt winding shaft relative to the fixture seat, and at the same time, the second anti-rotation device is used again to lock the belt winding shaft, which can greatly improve the clamping and unlocking efficiency of the object to be tested.

[0021] The special fixture for testing the breaking strength of aramid cloth described in the utility model is provided with an upper threaded hole threadedly connected to the upper fixing bolt and a lower threaded hole threadedly connected to the lower fixing bolt on the left clamp arm. It is only necessary to process two groups of threaded holes on the clamp base and cooperate with the existing fixing bolts to complete the detachable installation of the upper fixing plate and the lower fixing plate, thereby realizing the rapid installation of the first anti-rotation device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0023] Figure 1 It is a structural diagram of the utility model;

[0024] Figure 2 This is a schematic diagram of the external structure of the first anti-rotation device of the utility model;

[0025] Figure 3 for Figure 2 Middle AA cross-section;

[0026] Figure 4 The structure diagram of the winding shaft

[0027] Figure 5 This is the connection diagram between the aramid cloth and the winding shaft.

[0028] In the figure: 1, connector 2, belt winding shaft 3, left clamping arm 4, right clamping arm 5, belt threading groove 6, outer guard plate 7, top plate 8, bottom plate 9, upper fixing plate 10, lower fixing plate 11, vertical plate 12, upper fixing bolt 13, lower fixing bolt 14, shaft end disc 15, positioning plate 16, limit plate 17, locking pin 18, aramid cloth. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings: The present invention will be further illustrated below through specific embodiments, but it is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0030] Example 1, as Figure 1-2As shown, a special fixture for testing the breaking strength of aramid cloth comprises a winding shaft 2, a fixture seat and a connector 1 connected to the fixture seat, the fixture seat is provided with a left clamping arm 3 and a right clamping arm 4 parallel to each other, one end of the winding shaft 2 passes through the left clamping arm 3 and is connected to a first anti-rotation device on the outer wall of the left clamping arm 3, the other end of the winding shaft 2 passes through the right clamping arm 4 and is connected to a second anti-rotation device on the outer wall of the right clamping arm 4, a dead end belt threading groove 5 is provided along the length direction of the winding shaft 2, the first anti-rotation device includes an outer guard plate 6, the outer The upper and lower ends of the guard plate 6 are respectively bent to form a top plate 7 and a bottom plate 8. The other end of the top plate 7 is bent upward to form an upper fixed plate 9, and the upper fixed plate 9 is installed on the outer wall of the left clamping arm 3 through an upper fixing bolt 12. The other end of the bottom plate 8 is bent downward to form a lower fixed plate 10, and the lower fixed plate 10 is installed on the outer wall of the left clamping arm 3 through a lower fixing bolt 13. A vertical plate 11 is vertically connected between the top plate 7 and the bottom plate 8. The vertical plate 11 is inserted into the belt groove 5 at the end of the winding shaft 2, and the side of the vertical plate 11 is vertically connected to the inner wall of the outer guard plate 6.

[0031] The special fixtures are set up in pairs and connected to the two ends of the aramid cloth to be tested. Both sets of special fixtures are installed on the same set of tensile testers. The process of connecting the aramid cloth to be tested with the special fixtures is as follows:

[0032] First, release the restriction of the second anti-rotation device on the winding shaft 2, then move the winding shaft 2 laterally so that the winding shaft 2 is separated from the vertical plate 11 of the first anti-rotation device, and release the restriction of the first anti-rotation device on the winding shaft 2. Next, pass the end of the aramid cloth to be tested through the belt threading groove 5, and rotate the winding shaft 2 relative to the fixture seat. As the winding shaft 2 rotates, part of the aramid cloth is wound on the winding shaft 2, so that one end of the aramid cloth is pressed against the outer wall of the winding shaft 2 (such as Figure 5 As shown), one end of the aramid cloth can be fixed on the winding shaft 2.

[0033] Finally, the tape winding shaft 2 is moved laterally so that the vertical plate 11 is inserted into the tape threading groove 5 at the end of the tape winding shaft 2 again, limiting the rotation of the tape winding shaft 2 relative to the clamp seat, and at the same time, the tape winding shaft 2 is locked again using the second anti-rotation device.

[0034] A vertical plate 11 is vertically connected between the top plate 7 and the bottom plate 8. The side of the vertical plate 11 is vertically connected to the inner wall of the outer guard plate 6. The outer guard plate 6, the top plate 7, and the bottom plate 8 are respectively enclosed on three groups of side edges of the vertical plate 11. The overall rigidity is good and the connection strength is high, which is sufficient to resist the load transmitted from the winding shaft 2 to the vertical plate 11 and limit the rotation of the winding shaft 2 relative to the clamp seat.

[0035] Example 2, as Figure 1-2As shown, a special fixture for testing the breaking strength of aramid cloth comprises a winding shaft 2, a fixture seat and a connector 1 connected to the fixture seat, the fixture seat is provided with a left clamping arm 3 and a right clamping arm 4 parallel to each other, one end of the winding shaft 2 passes through the left clamping arm 3 and is connected to a first anti-rotation device on the outer wall of the left clamping arm 3, the other end of the winding shaft 2 passes through the right clamping arm 4 and is connected to a second anti-rotation device on the outer wall of the right clamping arm 4, a dead end belt threading groove 5 is provided along the length direction of the winding shaft 2, the first anti-rotation device includes an outer guard plate 6, the outer The upper and lower ends of the guard plate 6 are respectively bent to form a top plate 7 and a bottom plate 8. The other end of the top plate 7 is bent upward to form an upper fixed plate 9, and the upper fixed plate 9 is installed on the outer wall of the left clamping arm 3 through an upper fixing bolt 12. The other end of the bottom plate 8 is bent downward to form a lower fixed plate 10, and the lower fixed plate 10 is installed on the outer wall of the left clamping arm 3 through a lower fixing bolt 13. A vertical plate 11 is vertically connected between the top plate 7 and the bottom plate 8. The vertical plate 11 is inserted into the belt groove 5 at the end of the winding shaft 2, and the side of the vertical plate 11 is vertically connected to the inner wall of the outer guard plate 6.

[0036] Furthermore, the left clamp arm 3 is provided with an upper threaded hole for threaded connection with the upper fixing bolt 12, and a lower threaded hole for threaded connection with the lower fixing bolt 13. Simply by machining two sets of threaded holes on the clamp base and using the existing fixing bolts, the upper and lower fixing plates 9, 10 can be detachably mounted, enabling quick installation of the first anti-rotation device.

[0037] Further, refer to Figure 3-4 The first anti-rotation device comprises an axial end disc 14 coaxially connected to the tape winding shaft 2, the outer diameter of the axial end disc 14 is larger than the outer diameter of the tape winding shaft 2, a positioning plate 15 is vertically connected to the outer end surface of the axial end disc 14, the plane where the positioning plate 15 is located is perpendicular to the plane where the tape threading groove 5 is located, and further comprises a locking pin 17 and a limiting plate 16 fixed to the outer wall of the right clamp arm 4, the cap body of the locking pin 17 is supported on the upper surface of the limiting plate 16, and the bolt body of the locking pin 17 sequentially passes through the upper through hole on the limiting plate 16 and the lower through hole on the positioning plate 15. When the vertical plate 11 is inserted into the tape threading groove 5 at the end of the tape winding shaft 2 again, the first anti-rotation device can lock the tape winding shaft 2, and by inserting and removing the locking pin 17, the second anti-rotation device can lock or unlock the tape winding shaft 2. The second anti-rotation device locks the tape winding shaft 2 and can prevent the tape winding shaft 2 from moving laterally relative to the clamp seat.

[0038] Furthermore, the clamp seat, the left clamp arm 3 and the right clamp arm 4 are integrally processed.

[0039] Furthermore, the length of the tape threading groove 5 is 5 / 6-1 / 10 of the length of the tape winding shaft 2 .

[0040] Furthermore, the cross section of the tape winding shaft 2 is circular, and a circular hole for the tape winding shaft 2 to pass through is respectively opened on the left clamping arm 3 and the right clamping arm 4, and the inner diameter of the circular hole is slightly larger than the outer diameter of the tape winding shaft 2.

[0041] Furthermore, the connector 1 is connected to the fixture seat by welding.

[0042] The special fixture for testing the breaking strength of aramid cloth described in the utility model has a vertical plate connected vertically between the top plate and the bottom plate, the side edges of the vertical plate are vertically connected to the inner wall of the outer guard plate, and the outer guard plate, top plate and bottom plate are respectively enclosed on three groups of side edges of the vertical plate. The overall rigidity is good and the connection strength is high, which is sufficient to resist the load transmitted to the vertical plate by the winding belt axis and limit the rotation of the winding belt axis relative to the fixture seat.

[0043] The special fixture for testing the breaking strength of aramid cloth described in the utility model is characterized in that the end of the aramid cloth to be tested is passed through the belt threading groove, and the belt winding shaft is rotated relative to the fixture seat. As the belt winding shaft rotates, part of the aramid cloth is wound on the belt winding shaft, so that one end of the aramid cloth is pressed against the outer wall of the belt winding shaft, and the one end of the aramid cloth can be fixed on the belt winding shaft. The belt winding shaft is then moved horizontally so that the vertical plate is inserted into the belt threading groove at the end of the belt winding shaft again, thereby limiting the rotation of the belt winding shaft relative to the fixture seat, and at the same time, the second anti-rotation device is used again to lock the belt winding shaft, which can greatly improve the clamping and unlocking efficiency of the object to be tested.

[0044] The special fixture for testing the breaking strength of aramid cloth described in the utility model is provided with an upper threaded hole threadedly connected to the upper fixing bolt and a lower threaded hole threadedly connected to the lower fixing bolt on the left clamp arm. It is only necessary to process two groups of threaded holes on the clamp base and cooperate with the existing fixing bolts to complete the detachable installation of the upper fixing plate and the lower fixing plate, thereby realizing the rapid installation of the first anti-rotation device.

[0045] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

[0046] Any matters not described in detail in the present invention are well-known technologies to those skilled in the art.

Claims

1. A special fixture for testing the breaking strength of aramid cloth, comprising a winding shaft, a fixture base, and a connector connected to the fixture base, characterized in that: The locking mechanism is configured to lock the locking cam of the locking cam and lock the locking cam of the locking cam, wherein the locking cam has a first end fixed to the locking cam and a second end fixed to the locking cam of the locking cam.

2. The special fixture for testing the breaking strength of aramid cloth according to claim 1, characterized in that: The left clamp arm is provided with an upper threaded hole threadedly connected to the upper fixing bolt and a lower threaded hole threadedly connected to the lower fixing bolt.

3. The special fixture for testing the breaking strength of aramid cloth according to claim 2, characterized in that: The first anti-rotation device includes an axial end disc coaxially connected to the tape winding shaft, the outer diameter of the axial end disc is larger than the outer diameter of the tape winding shaft, and a positioning plate is vertically connected to the outer end surface of the axial end disc. The plane where the positioning plate is located is perpendicular to the plane where the tape passing groove is located. It also includes a locking pin and a limit plate fixed on the outer wall of the right clamp arm, the cap body of the locking pin is supported on the upper surface of the limit plate, and the bolt body of the locking pin passes through the upper through hole on the limit plate and the lower through hole on the positioning plate in sequence.

4. The special fixture for testing the breaking strength of aramid cloth according to claim 3, characterized in that: The clamp seat is integrally formed with the left clamp arm and the right clamp arm.

5. The special fixture for testing the breaking strength of aramid cloth according to claim 4, characterized in that: The length of the tape threading groove is 5 / 6-1 / 10 of the length of the tape winding shaft.

6. The special fixture for testing the breaking strength of aramid cloth according to claim 5, characterized in that: The cross section of the tape winding shaft is circular. The left clamping arm and the right clamping arm are respectively provided with circular holes for the tape winding shaft to pass through. The inner diameter of the circular hole is slightly larger than the outer diameter of the tape winding shaft.

7. The special fixture for testing the breaking strength of aramid cloth according to claim 6, characterized in that: The connecting head is connected to the fixture seat by welding.

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