A tire wire ring strength testing device

Abstract

The present invention relates to the field of steel wire strength testing, and specifically to a tire steel wire ring strength testing device, the tensile testing machine has two multifunctional clamping jaw devices distributed up and down, the multifunctional clamping jaw device comprises a double-layer bracket body, a driving cylinder, two clamping fingers, a winding assembly and a clamping assembly, the two clamping fingers are axially connected to the opposite sides with a T-shaped clamping wheel, a transmission mechanism is arranged between the output shaft of the driving cylinder and the two clamping fingers, the winding assembly comprises an anti-skid rubber wheel for driving the two T-shaped clamping wheels to rotate synchronously, and the clamping assembly comprises an arc-shaped pressure plate for clinging to the side wall of the T-shaped clamping wheel. The present invention replaces the traditional direct clamping method with a winding method, which greatly avoids the situation that the clamping part is broken due to excessive local stress concentration in the traditional clamping test method, effectively alleviates the defect of steel wire stress concentration in the traditional clamping method, and makes the test result more accurate and reliable.

Description

Technical Field

[0001] The invention relates to the field of steel wire strength testing, and in particular to a tire wire ring strength testing device. Background Art

[0002] The inspection process of bead wire after production usually includes appearance inspection, size inspection, mechanical property test, process performance test and metal coating inspection. The mechanical property test mainly relies on the tensile testing machine for testing. The tensile testing equipment is usually equipped with high-precision force sensors and displacement sensors. When the steel wire is subjected to tension, the force sensor will monitor the magnitude of the tension in real time, and the displacement sensor will simultaneously record the elongation of the steel wire.

[0003] When the wire breaks, the tension will suddenly drop, and the force sensor will capture this sudden change signal. The built-in control system of the device determines that the wire has broken based on this signal and immediately stops the stretching action. At the same time, the wire elongation data recorded by the displacement sensor will also be locked at this moment for subsequent calculation of the elongation rate after breaking.

[0004] At present, the common diameters of tire bead wires are 0.96mm, 1.0mm, 1.3mm, 1.4mm and 1.65mm, among which the diameter of 1mm is the main product. The conventional clamps on the tensile testing machine clamp the wire for testing. When the wire is clamped in the clamp, the clamping force applied by the clamp will cause stress concentration on the surface of the wire. If the clamping force is too large or uneven, the stress concentration phenomenon will be more serious. During the tensile test, as the tension increases, the wire is more likely to break at the stress concentration site. If the wire breaks at the clamping site, the accuracy of the tensile test will be affected to a certain extent. Because in this case, the measured tensile strength and other data cannot truly reflect the strength performance of the wire itself, but are interfered by factors such as clamping force and surface damage. Therefore, the test results in this case are unreliable. Summary of the invention

[0005] Based on this, it is necessary to provide a tire wire ring strength testing device to address the existing technical problems, which is used to overcome the stress concentration caused by the clamping of the wire in the traditional tensile testing machine, resulting in the fracture occurring at the clamping position during the test, resulting in unreliable test results.

[0006] In order to solve the problems of the prior art, the technical solution adopted by the present invention is:

[0007] A tire wire ring strength testing device comprises a tensile testing machine, the tensile testing machine has two multifunctional clamping jaw devices distributed up and down, wherein a lower multifunctional clamping jaw device is fixedly arranged on the base of the tensile testing machine, and an upper multifunctional clamping jaw device is arranged on the lifting beam of the tensile testing machine, the multifunctional clamping jaw device comprises a double-layer bracket main body, a driving cylinder arranged on the upper layer of the double-layer bracket main body, two clamping fingers arranged on the lower layer of the double-layer bracket main body, a winding assembly and a clamping assembly respectively arranged on both sides of the double-layer bracket main body, a T-shaped clamping wheel is axially connected to the opposite sides of the two clamping fingers, a transmission mechanism for driving the two T-shaped clamping wheels to approach each other is arranged between the output shaft of the driving cylinder and the two clamping fingers, the winding assembly comprises an anti-slip rubber wheel for driving the two T-shaped clamping wheels to rotate synchronously, and the clamping assembly comprises an arc-shaped pressure plate for being close to the side wall of the T-shaped clamping wheel.

[0008] Furthermore, the transmission mechanism includes a movable connecting block, a fixed seat block and two arc-shaped pull rods. The fixed seat block is fixedly arranged at the lower end of the double-layer bracket body, and the inner ends of the two clamping fingers are respectively hinged to the two sides of the fixed seat block. The movable connecting block is fixedly connected to the output shaft of the driving cylinder, and one end of the two arc-shaped pull rods are respectively hinged to the two sides of the movable connecting block, and the other end is respectively hinged to the outer side of the corresponding clamping finger.

[0009] Furthermore, the winding assembly also includes a supporting cantilever, a gear axially connected to the free end of the supporting cantilever, a rack arranged on one side of the double-layer bracket body and capable of meshing with the gear, and a driving mechanism for translating the rack, the number of the anti-slip rubber wheels is two, and the two are respectively located on both sides of the free end of the supporting cantilever, the gear is transmission-connected to the two anti-slip rubber wheels, one side of the fixed seat block is provided with a receiving groove for hinged connection of one end of the supporting cantilever, the receiving groove is provided with a hinge shaft for connecting the supporting cantilever, the hinge shaft is also provided with a torsion spring for driving the supporting cantilever to flip in a direction away from the fixed seat block, the side wall of the double-layer bracket body is also provided with a supporting bracket at the far end of the output screw of the screw motor axially connected, the supporting bracket is formed with a positioning plate for blocking and limiting the elastic flipping of the supporting cantilever, and when the supporting cantilever contacts the positioning plate, the gear is still located on the tooth surface side of the rack.

[0010] Furthermore, the driving mechanism includes a screw motor, a guide rail and a threaded slider. The screw motor and the guide rail are fixedly arranged on the outer wall of the double-layer bracket body. The threaded slider is arranged on the output screw of the screw motor. The bottom of the threaded slider is provided with a limit plate that slides with the guide rail, and the rack is fixedly connected to the threaded slider.

[0011] Furthermore, there is one rack, which is fixedly connected to the middle part of the threaded slider, and the length direction of the rack is consistent with the length direction of the output screw of the screw motor. The gear shaft is connected to the middle part of the free end of the supporting cantilever, and the middle part of the free end of the supporting cantilever is formed with a U-shaped groove for accommodating the gear, and the gear is coaxially fixed to the two anti-slip rubber wheels.

[0012] Furthermore, there are two racks, which are symmetrically fixed on both sides of the threaded slider, and the two racks are parallel to the screw output shaft of the screw motor. An axle seat is formed on the outer side of the free end of the support cantilever, and a reversing gear is rotatably connected in the axle seat. A driven gear meshing with the reversing gear is rotatably connected in the middle of the free end of the support cantilever, and the driven gear is coaxially fixed to two anti-slip rubber wheels. The two gears are respectively located on both sides of the axle seat, and the two gears are coaxially fixed to the reversing gear. The diameter of the gear is smaller than the diameter of the reversing gear, and the reversing gear and the driven gear have the same diameter. The two racks are arranged in a one-to-one correspondence with the two gears.

[0013] Furthermore, the clamping assembly also includes a tilting rod, a mini cylinder and a U-shaped push-pull frame. The mini cylinder is fixedly arranged on the side of the double-layer bracket body away from the winding assembly, and the U-shaped push-pull frame is fixedly connected to the output shaft of the mini cylinder. The middle fixed point of the tilting rod is axially connected to the bottom side of the fixed seat block, and the arc-shaped pressure plate is located directly below the fixed seat block. The top of the arc-shaped pressure plate is axially connected to one end of the tilting rod, and the other end of the tilting rod extends into the inner side of the U-shaped push-pull frame. A strip through groove is opened at the end of the tilting rod extending into the U-shaped push-pull frame, and a pin shaft crossing the strip through groove is fixedly connected between the lower ends of the U-shaped push-pull frame.

[0014] Furthermore, the curvature of the curved surface of the curved pressure plate is consistent with the curvature of the cylindrical wall at the small end of the T-shaped clamping wheel, and a rubber anti-slip layer is attached to one side of the curved surface of the curved pressure plate.

[0015] Furthermore, the support bracket is provided with an avoidance through hole for the rack to pass through.

[0016] Furthermore, the support bracket is formed with two symmetrically distributed limiting pressure plates for slidingly fitting the back sides of the two racks respectively.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] Firstly, the present invention replaces the traditional direct clamping method with a coiling method, which greatly avoids the situation in which the clamping part is broken due to excessive concentration of local stress in the traditional clamping test method;

[0019] Secondly, the present invention provides two types of winding clamp structures, forward winding or reverse winding, to adapt to different test forms;

[0020] Thirdly, the present invention holds the steel wire over a large area by means of arc-surface fitting after winding, thereby effectively alleviating the defect of stress concentration of the steel wire in the traditional clamping method, and making the test result more accurate and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0022] Figure 2 is a plan view of the multifunctional clamping jaw device of the present invention;

[0023] Figure 3 The three-dimensional structure diagram of the multifunctional clamping device of the present invention is shown in FIG. Figure 1 ;

[0024] Figure 4 The three-dimensional structure diagram of the multifunctional clamping device of the present invention is shown in FIG. Figure 2 ;

[0025] Figure 5 yes Figure 4 A three-dimensional schematic diagram of the local structure;

[0026] Figure 6 It is a schematic diagram of the three-dimensional structure decomposition of the multifunctional clamping jaw device of the present invention;

[0027] Figure 7 yes Figure 6 A schematic diagram of the structure enlargement at point A;

[0028] Figure 8 is a planar cross-sectional view of the multifunctional clamping jaw device of the present invention;

[0029] Fig. 9 yes Figure 8 A schematic diagram of the structure at B in FIG.

[0030] Fig.10 It is a schematic diagram of the three-dimensional structure of the multifunctional clamping jaw device of the present invention when it is in an open state.

[0031] The numbers in the figure are: 1-tensile testing machine; 2-multi-function clamping device; 3-double-layer bracket body; 4-driving cylinder; 5-clamping finger; 6-T-type clamping wheel; 7-anti-skid rubber wheel; 8-arc-shaped pressure plate; 9-movable connection block; 10-fixed seat block; 11-arc-shaped pull rod; 12-support cantilever; 13-gear; 14-rack; 15-accommodating groove; 16-hinge shaft; 17-torsion spring; 18-support bracket; 19-positioning plate; 20-screw motor; 21-guide rail; 22-threaded slider; 23-limiting plate; 24-U-shaped slot; 25-axle seat; 26-reversing gear; 27-driven gear; 28-tilt rod; 29-mini cylinder; 30-U-type push-pull frame; 31-strip through groove; 32-pin shaft; 33-rubber anti-skid layer; 34-limiting pressure plate; 35-steel wire. DETAILED DESCRIPTION

[0032] 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.

[0033] Reference Figures 1 to 10 As shown, a tire wire ring strength inspection device includes a tensile testing machine 1, characterized in that the tensile testing machine 1 has two multifunctional clamping jaw devices 2 distributed up and down, wherein the lower multifunctional clamping jaw device 2 is fixedly arranged on the base of the tensile testing machine 1, and the upper multifunctional clamping jaw device 2 is arranged on the lifting beam of the tensile testing machine 1, the multifunctional clamping jaw device 2 includes a double-layer bracket body 3, a driving cylinder 4 arranged on the upper layer of the double-layer bracket body 3, two clamping fingers 5 arranged on the lower layer of the double-layer bracket body 3, and a winding assembly and a clamping assembly respectively arranged on both sides of the double-layer bracket body 3, and the two clamping fingers 5 are axially connected to the opposite sides with a T-shaped clamping wheel 6, and a transmission mechanism for driving the two T-shaped clamping wheels 6 to approach each other is arranged between the output shaft of the driving cylinder 4 and the two clamping fingers 5, the winding assembly includes an anti-slip rubber wheel 7 for driving the two T-shaped clamping wheels 6 to rotate synchronously, and the clamping assembly includes an arc-shaped pressure plate 8 for being close to the side wall of the T-shaped clamping wheel 6.

[0034] The tensile testing machine 1 of the present device is pulled by manual or mechanical hands in cooperation with a visual system, and one end of the steel wire 35 on the winding reel is sent into the multifunctional clamping claw device 2 located at the top of the tensile testing machine 1 to clamp it. The specific process is that the driving cylinder 4 drives the two clamping fingers 5 to approach each other, and during the process, the two clamping fingers 5 drive the two T-type clamping wheels 6 to approach each other until one end of the steel wire 35 between the two is clamped. Then the winding assembly is actuated, and the anti-slip rubber wheel 7 is pressed against the outer edge of the large end of the T-type clamping wheel 6 and then rotated, thereby driving the two T-type clamping wheels 6 that clamp the ends of the steel wire 35 together to rotate several times. In this process, the steel wire 35 is wound around the reel several times and attached to the inner side of the "I-shaped wheel" formed by the two T-type clamping wheels 6. Then the clamping assembly is actuated, and the arc-shaped pressure plate 8 is pressed close to and until the steel wire 35 between the two T-type clamping wheels 6 is firmly pressed.

[0035] Then, a certain length of the steel wire 35 is cut off manually or by a robot, and the tail end of the cut steel wire 35 is sent to the multifunctional clamping device 2 below to be clamped, coiled several times, and then pressed. The specific process is the same as described above.

[0036] Then the tensile testing machine 1 starts the mechanical property test of the bead wire 35, and the test principle is as follows:

[0037] Tensile strength test: The tensile testing machine 1 performs a tensile test on the tire bead wire 35 to determine its tensile strength. The multifunctional clamping device 2 clamping both ends of the wire 35 gradually increases the tensile force until the wire 35 breaks, and the tensile force value at the time of breaking is recorded. The tensile strength obtained should meet the requirements of the relevant standards, and the wire 35 that does not meet the tensile strength standard shall be eliminated.

[0038] Elongation after fracture test: During the tensile strength test, the ratio of the elongation of the steel wire 35 after fracture to the original length is measured, which is the elongation after fracture. This indicator reflects the plastic deformation capacity of the steel wire 35 before fracture and must comply with the standard.

[0039] Yield strength ratio test: The yield strength and tensile strength of the steel wire 35 are tested by the tensile testing machine 1, and the yield strength ratio (ratio of yield strength to tensile strength) is calculated. The yield strength ratio is an important indicator to measure the strength reserve and safety of the steel wire 35 material, and it must be within a reasonable range.

[0040] The tensile testing machine 1 is equipped with a high-precision force sensor and a displacement sensor. When the steel wire 35 is subjected to a tensile force, the force sensor will monitor the magnitude of the tensile force in real time, and the displacement sensor will synchronously record the elongation of the steel wire 35;

[0041] When the steel wire 35 breaks, the tension will suddenly drop, and the force sensor will capture this sudden change signal. The built-in control system of the equipment will determine that the steel wire 35 has broken based on this signal and immediately stop the stretching action. At the same time, the elongation data of the steel wire 35 recorded by the displacement sensor will also be locked at this moment for subsequent calculation of the elongation rate after breakage.

[0042] In order to achieve the goal of being able to drive the two clamping fingers 5 to approach each other until the two T-shaped clamping wheels 6 jointly clamp the steel wire 35, the following features are specifically set:

[0043] The transmission mechanism includes a movable connection block 9, a fixed seat block 10 and two arc-shaped pull rods 11. The fixed seat block 10 is fixedly arranged at the lower end of the double-layer bracket body 3. The inner ends of the two clamping fingers 5 are respectively hinged to the two sides of the fixed seat block 10. The movable connection block 9 is fixedly connected to the output shaft of the driving cylinder 4. One end of the two arc-shaped pull rods 11 is respectively hinged to the two sides of the movable connection block 9, and the other end is respectively hinged to the outer side of the corresponding clamping fingers 5.

[0044] The output shaft of the driving cylinder 4 extends out, driving the movable connecting block 9 to move forward. During this process, the two arc-shaped pull rods 11 hinged thereto push the two clamping fingers 5 to flip inward around their respective hinge points, so that they approach each other until the two T-shaped clamping wheels 6 jointly clamp the steel wire 35; in addition to the implementation method provided in this embodiment, the transmission mechanism can also be implemented by means such as inclined wedge cooperation, that is, the two clamping fingers 5 are translated closer or farther away through inclined surface cooperation, which will not be repeated here.

[0045] In order to achieve the effect of winding several turns of the clamped steel wire 35, the following features are specifically set:

[0046] The winding assembly also includes a supporting cantilever 12, a gear 13 axially connected to the free end of the supporting cantilever 12, a rack 14 arranged on one side of the double-layer bracket body 3 and capable of meshing with the gear 13, and a driving mechanism for translating the rack 14. The number of the anti-skid rubber wheels 7 is two, and the two are respectively located on both sides of the free end of the supporting cantilever 12. The gear 13 is connected to the two anti-skid rubber wheels 7 in a transmission manner. A receiving groove 15 for hingedly connecting one end of the supporting cantilever 12 is provided on one side of the fixed seat block 10, and a receiving groove 15 is provided in the receiving groove 15 for A hinge shaft 16 is provided for connecting the support cantilever 12, and a torsion spring 17 is provided on the hinge shaft 16 for driving the support cantilever 12 to flip in a direction away from the fixed seat block 10. A support bracket 18 for the far end of the output screw of the screw motor 20 is also provided on the side wall of the double-layer bracket body 3. A positioning plate 19 is formed on the support bracket 18 for blocking and limiting the elastic flipping of the support cantilever 12. When the support cantilever 12 contacts the positioning plate 19, the gear 13 is still located on the tooth surface side of the rack 14.

[0047] After the two T-type clamping wheels 6 clamp the steel wire 35 together, the driving mechanism drives the rack 14 to move in the direction of the gear 13, and the rack 14 gradually changes from a state away from the gear 13 to a state close to and meshing with the gear 13. After the two are meshed, the rack 14 continues to move forward, thereby rubbing the gear 13 to rotate several circles and then stops. In this process, the rotation of the gear 13 drives the anti-skid rubber wheel 7 connected to the gear 13 to rotate several circles, thereby realizing the synchronous rotation of the two T-type clamping wheels 6 for several circles, and then achieving the effect of winding the clamped steel wire 35 several circles around the inner side of the "I-shaped wheel" formed by the two T-type clamping wheels 6;

[0048] The support cantilever 12 is movably connected to the receiving groove 15 of the fixed seat block 10 through the torsion spring 17. Under the action of the torsion spring 17, the support cantilever 12 always has a tendency to elastically flip outward. Under this effect, when the rack 14 is not in contact with the gear 13 and is not in operation, the support cantilever 12 always remains away from the two clamping fingers 5, thereby avoiding the risk of touching the T-type clamping wheel 6 when the two clamping fingers are close to the clamping wire 35.

[0049] The support bracket 18 is provided to maintain the rotational stability of the output shaft of the screw motor 20 on the one hand, and the positioning plate 19 provided thereon is used to resist the support cantilever 12 that is elastically flipped outward, thereby limiting the maximum angle of its outward flipping. When the support cantilever 12 contacts the positioning plate 19, the gear 13 is still located on one side of the tooth surface of the rack 14, thereby ensuring that the rack 14 can mesh with each other during the process of translation and approaching. When the rack 14 and the gear 13 are fully meshed, the anti-slip rubber wheel 7 is in friction contact with the corresponding T-type clamping wheel 6.

[0050] In order to achieve a stable translational motion effect of the rack 14, the following features are specifically set:

[0051] The driving mechanism includes a screw motor 20, a guide rail 21 and a threaded slider 22. The screw motor 20 and the guide rail 21 are fixedly arranged on the outer wall of the double-layer bracket body 3. The threaded slider 22 is arranged on the output screw of the screw motor 20. The bottom of the threaded slider 22 is provided with a limit plate 23 that slides with the guide rail 21. The rack 14 is fixedly connected to the threaded slider 22.

[0052] The screw motor 20 drives its screw output shaft to rotate, so that the threaded slider 22 threadedly matched with it can only translate along the axial direction of the screw output shaft under the anti-rotation limit function of the guide rail 21, thereby driving the rack 14 fixed thereto to perform stable translational movement.

[0053] In order to achieve the purpose of driving the two anti-skid rubber wheels 7 to rotate coaxially through the rotation of the gear 13 and then driving the T-type clamping wheel 6 to rotate the winding wire 35, the following features are specifically set:

[0054] The number of the rack 14 is one, and the rack 14 is fixedly connected to the middle part of the threaded slider 22. The length direction of the rack 14 is consistent with the length direction of the output screw of the screw motor 20. The gear 13 is axially connected to the middle part of the free end of the support cantilever 12. The middle part of the free end of the support cantilever 12 is formed with a U-shaped groove 24 for accommodating the gear 13. The gear 13 is coaxially fixedly connected to the two anti-slip rubber wheels 7. The support bracket 18 is provided with an avoidance through hole for the rack 14 to pass through.

[0055] The screw motor 20 drives the threaded slider 22 and the rack 14 to translate. In the process of the rack 14 meshing with the gear 13 and driving the gear 13 to rotate several times, since the two anti-skid rubber wheels 7 are coaxially fixed to the central axis of the gear 13, the rotation of the gear 13 can drive the anti-skid rubber wheels 7 on both sides to rotate synchronously, and then the two anti-skid rubber wheels 7 drive the two T-shaped clamping wheels 6 that are in friction contact with each other to rotate until the steel wire 35 clamped between the two is coiled several times; the avoidance through hole provided on the support bracket 18 is used on the one hand for the rack 14 to translate through, and on the other hand for slidingly supporting the back side of the rack 14, thereby preventing the free end of the rack 14 from tilting up and affecting the meshing transmission with the gear 13.

[0056] In order to adapt to complex working conditions and to be able to smoothly coil the steel wire 35 when there are requirements on the coiling direction of the steel wire 35, the cooperation between the gear 13 and the rack 14 can also be replaced by the following method:

[0057] There are two racks 14, which are symmetrically fixed on both sides of the threaded slider 22. The two racks 14 are parallel to the screw output shaft of the screw motor 20. A shaft seat 25 is formed on the outer side of the free end of the support cantilever 12, and a reversing gear 26 is rotatably connected in the shaft seat 25. A driven gear 27 meshing with the reversing gear 26 is rotatably connected in the middle of the free end of the support cantilever 12. The driven gear 27 is coaxially fixed with the two anti-slip rubber wheels 7. The two gears 13 are respectively located on both sides of the shaft seat 25. The two gears 13 are coaxially fixed with the reversing gear 26. The diameter of the gear 13 is smaller than the diameter of the reversing gear 26. The reversing gear 26 and the driven gear 27 have the same diameter. The two racks 14 are arranged one-to-one with the two gears 13. Two symmetrically distributed limiting pressure plates 34 are formed on the support bracket 18 for slidingly fitting the back sides of the two racks 14 respectively.

[0058] In this scheme, the number of racks 14 and the number of gears 13 are both two. At this time, the gear 13 drives the two anti-skid rubber wheels 7 to rotate in an indirect transmission manner. The specific process is that the screw motor 20 drives the threaded slider 22 to drive the two racks 14 fixedly connected thereto to translate, and the two racks 14 translate synchronously and approach the two corresponding gears 13 until they are meshed, and then the two gears 13 rotate synchronously, and the two gears 13 are coaxially fixedly connected to the reversing gear 26 at the middle position between the two. Therefore, in this process, the reversing gear 26 rotates synchronously therewith, and the reversing gear 26 drives the driven gear 27 meshing therewith to rotate in the opposite direction, and then drives the two anti-skid rubber wheels 7 coaxially fixedly connected to the driven gear 27 to rotate synchronously. At this time, during the friction contact rotation of the two anti-skid rubber wheels 7, the two T-type clamping wheels 6 drive the steel wire 35 pressed by the two to rotate to realize the winding of the steel wire 35; the function of the limiting pressure plate 34 is the same as the above-mentioned avoidance through hole, which is used to movably support the non-fixed end of the rack 14 to ensure the normal progress of the meshing process.

[0059] The difference between the two winding assembly configurations is that the directions of winding the steel wire 35 are different, one is to wind the steel wire 35 clockwise, and the other is to wind the steel wire 35 counterclockwise. The two structural forms can be flexibly selected according to the type of test method. At the same time, in the form of adding the reversing gear 26, the proportion of the rotating gear ring can be flexibly adjusted, so that the number of windings of the steel wire 35 can be flexibly preset, so as to adapt to complex application scenarios (only the structural schematic diagram of the double rack 14 is given in the attached figure).

[0060] In order to achieve the compression and fixation of a large area after the steel wire 35 is coiled several times, the following features are specifically set:

[0061] The clamping assembly also includes a tilting rod 28, a mini cylinder 29 and a U-shaped push-pull frame 30. The mini cylinder 29 is fixedly arranged on the side of the double-layer bracket body 3 away from the winding assembly. The U-shaped push-pull frame 30 is fixedly connected to the output shaft of the mini cylinder 29. The middle fixed point of the tilting rod 28 is axially connected to the bottom side of the fixed seat block 10. The arc pressure plate 8 is located directly below the fixed seat block 10. The top of the arc pressure plate 8 is connected to the damping shaft at one end of the tilting rod 28. The other end of the tilting rod 28 extends into the inner side of the U-shaped push-pull frame 30. A strip through groove 31 is opened at one end of the tilting rod 28 extending into the U-shaped push-pull frame 30, and a pin shaft 32 that crosses the strip through groove 31 is fixedly connected between the lower ends of the U-shaped push-pull frame 30.

[0062] The output shaft of the mini cylinder 29 is retracted, driving one end of the tilting rod 28 to move upward, so that the other end of the tilting rod 28 moves downward around its axis joint, thereby driving the arc-shaped pressing plate 8 at this end to move downward and approach the inner side of the "I-shaped wheel" composed of two T-shaped clamping wheels 6, until the arc surface of the arc-shaped pressing plate 8 hugs the several turns of steel wire 35 on the inner side of the "I-shaped wheel";

[0063] The output shaft of the mini cylinder 29 is slidably connected with the strip-shaped through slot 31 at the end of the tilting rod 28 through the pin 32 at the lower end of the U-shaped push-pull frame 30, thereby ensuring that the extension and retraction of the mini cylinder 29 can smoothly drive the rotation of the tilting rod 28 to avoid locking;

[0064] It should be noted that the arc-shaped pressing plate 8 in the multifunctional clamping jaw device 2 located at the top is in a hoisting state. In this state, under the action of its own gravity, the arc-shaped pressing plate 8 is always in a suspended state, so that it can adaptively fit and hold the steel wire 35 when it approaches the "I-shaped wheel";

[0065] The arc-shaped pressure plate 8 in the multifunctional clamping device 2 located on the base of the tensile testing machine 1, that is, at the bottom, is in an inverted state. At this time, the axial connection between the arc-shaped pressure plate 8 and the tilting rod 28 needs to be connected with a resistance shaft to prevent the arc-shaped pressure plate 8 from flipping and falling to both sides. Under the effect of the resistance shaft, the arc surface of the arc-shaped pressure plate 8 is always in the direction of the "I-shaped wheel", and then in the process of clamping the steel wire 35, it can be adjusted by slight rotation until it is completely fitted and clamped.

[0066] In order to better ensure the compaction effect, the following features are specifically set:

[0067] The curvature of the arc surface of the arc pressure plate 8 is consistent with the curvature of the cylindrical wall at the small end of the T-shaped clamping wheel 6. A rubber anti-skid layer 33 is attached to one side of the arc surface of the arc pressure plate 8. The rubber anti-skid layer 33 ensures that a strong friction resistance can be provided to the pressed steel wire 35 without the need for excessive clamping force. If the arc pressure plate 8 is in hard contact with the steel wire 35 through a large pressure, it will cause local deformation or even cracking of the steel wire 35, thereby affecting the accuracy of the experimental results.

Claims

1. A tire bead strength testing device, comprising a tensile testing machine (1), characterized in that: The tensile testing machine (1) has two multifunctional clamping jaw devices (2) distributed in an upper and lower manner, wherein the lower multifunctional clamping jaw device (2) is fixedly arranged on the base of the tensile testing machine (1), and the upper multifunctional clamping jaw device (2) is arranged on the lifting beam of the tensile testing machine (1), and the multifunctional clamping jaw device (2) comprises a double-layer support body (3), a driving cylinder (4) arranged on the upper layer of the double-layer support body (3), two clamping fingers (5) arranged on the lower layer of the double-layer support body (3), and two clamping jaws (6) arranged on the lower layer of the double-layer support body (3). A winding assembly and a clamping assembly are arranged on both sides of the double-layer bracket body (3); the two clamping fingers (5) are connected to a T-shaped clamping wheel (6) on one side facing each other; a transmission mechanism for driving the two T-shaped clamping wheels (6) to move toward each other is arranged between the output shaft of the driving cylinder (4) and the two clamping fingers (5); the winding assembly includes an anti-skid rubber wheel (7) for driving the two T-shaped clamping wheels (6) to rotate synchronously; and the clamping assembly includes an arc-shaped pressure plate (8) for being pressed against the side wall of the T-shaped clamping wheel (6); The transmission mechanism comprises a movable connection block (9), a fixed seat block (10) and two arc-shaped pull rods (11); the fixed seat block (10) is fixedly arranged at the lower end of the double-layer bracket body (3); the inner ends of the two clamping fingers (5) are respectively hinged to the two sides of the fixed seat block (10); the movable connection block (9) is fixedly connected to the output shaft of the driving cylinder (4); one end of the two arc-shaped pull rods (11) is respectively hinged to the two sides of the movable connection block (9), and the other end is respectively hinged to the outer side of the corresponding clamping finger (5); The winding assembly further comprises a supporting cantilever (12), a gear (13) axially connected to the free end of the supporting cantilever (12), a rack (14) arranged on one side of the double-layer bracket body (3) and capable of meshing with the gear (13), and a driving mechanism for translating the rack (14); the number of the anti-skid rubber wheels (7) is two, and the two are respectively located on both sides of the free end of the supporting cantilever (12); the gear (13) is connected to the two anti-skid rubber wheels (7) in a transmission manner; a receiving groove (15) for hingedly connecting one end of the supporting cantilever (12) is provided on one side of the fixed seat block (10); the receiving groove (15) is provided with a A hinge shaft (16) connected to the support cantilever (12) is provided on the hinge shaft (16) with a torsion spring (17) for driving the support cantilever (12) to flip in a direction away from the fixed seat block (10); a support bracket (18) for the far end of the output screw of the axially connected screw motor (20) is also provided on the side wall of the double-layer bracket body (3); a positioning plate (19) is formed on the support bracket (18) for blocking and limiting the elastic flipping of the support cantilever (12); when the support cantilever (12) contacts the positioning plate (19), the gear (13) is still located on the tooth surface side of the rack (14).

2. A tire bead ring strength testing device according to claim 1, characterized in that: The driving mechanism comprises a screw motor (20), a guide rail (21) and a threaded slider (22); the screw motor (20) and the guide rail (21) are both fixedly arranged on the outer wall of the double-layer bracket body (3); the threaded slider (22) is arranged on the output screw of the screw motor (20); a limit plate (23) slidably matched with the guide rail (21) is provided at the bottom of the threaded slider (22); and the rack (14) is fixedly connected to the threaded slider (22).

3. A tire bead ring strength testing device according to claim 2, characterized in that: The number of the rack (14) is one, the rack (14) is fixedly connected to the middle of the threaded slider (22), the length direction of the rack (14) is consistent with the length direction of the output screw of the screw motor (20), the gear (13) is axially connected to the middle of the free end of the support cantilever (12), the middle of the free end of the support cantilever (12) is formed with a U-shaped slot (24) for accommodating the gear (13), and the gear (13) is coaxially fixedly connected to the two anti-slip rubber wheels (7).

4. A tire bead ring strength testing device according to claim 2, characterized in that: The number of the racks (14) is two, and the two racks (14) are symmetrically fixed to the two sides of the threaded slider (22). The two racks (14) are parallel to the screw output shaft of the screw motor (20). A shaft seat (25) is formed on the outer side of the free end of the support cantilever (12), and a reversing gear (26) is rotatably connected in the shaft seat (25). A driven gear (26) meshing with the reversing gear (26) is rotatably connected in the middle of the free end of the support cantilever (12). 27), the driven gear (27) is coaxially fixedly connected to the two anti-slip rubber wheels (7), the two gears (13) are respectively located on both sides of the shaft seat (25), the two gears (13) are coaxially fixedly connected to the reversing gear (26), the diameter of the gear (13) is smaller than the diameter of the reversing gear (26), the reversing gear (26) and the driven gear (27) have the same diameter, and the two racks (14) are arranged in a one-to-one correspondence with the two gears (13).

5. A tire bead ring strength testing device according to claim 1, characterized in that: The clamping assembly also includes a tilting rod (28), a mini cylinder (29) and a U-shaped push-pull frame (30), wherein the mini cylinder (29) is fixedly arranged on a side of the double-layer bracket body (3) away from the winding assembly, and the U-shaped push-pull frame (30) is fixedly connected to the output shaft of the mini cylinder (29), the middle fixed point of the tilting rod (28) is axially connected to the bottom side of the fixed seat block (10), the arc-shaped pressure plate (8) is located directly below the fixed seat block (10), the top of the arc-shaped pressure plate (8) is axially connected to one end of the tilting rod (28), the other end of the tilting rod (28) extends into the inner side of the U-shaped push-pull frame (30), and a strip through groove (31) is opened at one end of the tilting rod (28) extending into the U-shaped push-pull frame (30), and a pin shaft (32) that crosses the strip through groove (31) is fixedly connected between the lower ends of the U-shaped push-pull frame (30).

6. A tire bead ring strength testing device according to claim 1, characterized in that: The curvature of the curved surface of the curved pressure plate (8) is consistent with the curvature of the cylindrical wall at the small end of the T-shaped pressing wheel (6), and a rubber anti-slip layer (33) is attached to one side of the curved surface of the curved pressure plate (8).

7. A tire bead ring strength testing device according to claim 3, characterized in that: The support bracket (18) is provided with an avoidance through hole for the rack (14) to pass through.

8. A tire bead ring strength testing device according to claim 4, characterized in that: The support bracket (18) is formed with two symmetrically distributed limiting pressure plates (34) for slidingly fitting the back sides of the two racks (14) respectively.

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