A machine for testing the mechanical properties of radial tire cords

Abstract

The present application relates to the technical field of performance detection, and particularly relates to a mechanical performance testing machine for meridian tire cord, which has multiple functions, can complete multiple mechanical performance experiments by one testing machine, and can make the stress of multiple cords same, and reduce experimental deviation; the mechanical performance testing machine comprises a rack; a clamping mechanism comprises a fixed clamping part and a movable clamping part, the fixed clamping part is fixedly installed on the rack, the fixed clamping part is provided with a force measuring part, the movable clamping part is lockably and slidably installed on the rack, the movable clamping part is provided with a structure for adjusting multiple cords to have same stress, the fixed clamping part and the movable clamping part are matched to perform stretching and compression experiments on the multiple cords; an impact mechanism is installed on the rack, the impact mechanism impacts the movable clamping part in a direction away from the fixed clamping part to test the impact resistance of the experimental cord; a bending mechanism is located between the fixed clamping part and the movable clamping part, the bending mechanism periodically bends and vibrates multiple taut cords to test the fatigue degree of the experimental cord and detect the resonant frequency of the cord.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of performance detection, in particular to a mechanical performance testing machine for meridian tire cord. BACKGROUND

[0002] Meridian tire is a new type of tire in which the carcass cord is arranged in the meridian direction, and the cushion layer with cord circumferential arrangement or close to circumferential arrangement is tightly wrapped on the carcass. It is composed of six main parts: tread, carcass, sidewall, cushion layer, bead and air tight layer. According to the different materials of the carcass and belt layer, meridian tire can be divided into three types: all steel meridian tire, semi-steel meridian tire and all fiber meridian tire. Meridian tire cord is a kind of internal steel material of tire. Because the meridian tire has a rigid belt layer between the tread and the carcass cord layer, the circumferential deformation of the tire is small when it rolls on the road, and the relative slip is small. Because the radial elasticity of the tire body is large, the tire ground contact area is increased, and the pressure is reduced, so the tread has strong wear resistance, and is resistant to puncture, and the driving distance is longer than that of traditional tires, and the service life is longer.

[0003] As a key material of meridian tire, the mechanical properties of meridian tire cord directly affect the performance of the tire, so it is necessary to experimentally detect the mechanical properties of meridian tire cord. The main indicators of the mechanical properties of meridian tire cord include tensile resistance, compression resistance, impact resistance and fatigue degree. The mechanical property testing machine for meridian tire cord in the prior art has a single function, for example, the steel cord core strand extraction force detection device disclosed in the Chinese utility model patent with the patent number ZL201521114910.9. Therefore, when multiple mechanical property tests are performed, multiple function-specific testing machines are needed to perform different tests, which is complicated to operate. Moreover, when multiple meridian tire cords are clamped, the clamping length cannot be accurately uniform, so it is difficult to ensure that the multiple meridian tire cords are subjected to the same force during the test, resulting in a large deviation between the test results and the actual values. SUMMARY

[0004] To solve the above technical problems, the present application provides a meridian tire cord mechanical property testing machine with multiple functions, which can complete multiple mechanical property tests with one testing machine, and can ensure that multiple meridian tire cords are subjected to the same force, thereby reducing the test deviation.

[0005] The application discloses a mechanical performance testing machine for radial tire cords, which comprises a rack, a clamping mechanism, an impact mechanism and a bending mechanism.

[0006] Preferably, the fixed clamping part comprises a winding shaft, two pressing plates, two worm gear boxes and two force sensors, the winding shaft is provided with a clamping groove in the axial direction, the two pressing plates are located in the clamping groove, a plurality of pressing bolts are rotationally screwed on the winding shaft, the inner ends of the plurality of pressing bolts are respectively rotationally screwed with the two pressing plates, the left and right ends of the winding shaft are respectively connected with the two worm gear boxes through a center shaft, and the two worm gear boxes are respectively installed on the rack through the two force sensors; one end of a plurality of radial tire cords is inserted into the clamping groove of the winding shaft and extends between the two pressing plates, the pressing bolts on the two pressing plates are tightened, so that the two pressing plates firmly clamp one end of the plurality of radial tire cords, the drive shafts of the two worm gear boxes are rotated, so that the winding shaft is rotated, so that the plurality of radial tire cords are wound around the winding shaft for several turns, and the clamping firmness is further improved, the worm and worm gear cooperation of the two worm gear boxes has a self-locking function, so as to avoid forceful rotation of the winding shaft, the two force sensors check the stress condition of the plurality of radial tire cords through the two worm gear boxes and the winding shaft, the clamping is firm, and the operation is simple.

[0007] Preferably, the movable clamping part comprises a sliding table, a telescopic cylinder, a mounting frame, a tensioning shaft, two worm gear boxes two, a plurality of binding wheels and a plurality of brake drums, the sliding table is installed on the rack, the fixed end of the telescopic cylinder is installed on the sliding table, the piston rod of the telescopic cylinder is connected with the mounting frame, the mounting frame is slidingly installed on the sliding table, both ends of the mounting frame are provided with the worm gear boxes two, the two ends of the tensioning shaft are respectively connected with the two worm gear boxes two, the middle part of the tensioning shaft is provided with the plurality of binding wheels and the plurality of brake drums, the plurality of binding wheels are provided with bearings and fixed-torque disengagement structures, the fixed-torque disengagement structures are connected with the inner ring and the outer ring of the bearing in a fixed-torque mode, the inner ring of the bearing is fixedly sleeved on the tensioning shaft, the plurality of binding wheels are provided with structures for binding the radial tire cords, the side surfaces of the plurality of binding wheels are provided with friction discs matched with the brake drums, and the plurality of brake drums brake and lock the plurality of binding wheels; one end of a plurality of radial tire cords is respectively bound on the plurality of binding wheels, the two worm gear boxes two are operated to rotate the tensioning shaft, the tensioning shaft drives the plurality of binding wheels to rotate and wind the plurality of radial tire cords, when one radial tire cord is taut and reaches a certain tension, the fixed-torque disengagement structure of the corresponding binding wheel disengages the inner ring and the outer ring of the bearing, so that the binding wheel maintains the tension and does not wind the radial tire cord, the worm gear boxes two are continuously operated to rotate the tensioning shaft, until the fixed-torque disengagement structures of all the binding wheels are operated, at this time, the tensions of all the radial tire cords are adjusted to be the same, the plurality of brake drums are operated to frictionally brake the plurality of binding wheels, the worm and worm gear cooperation of the two worm gear boxes two has a self-locking function, so as to avoid forceful rotation of the tensioning shaft, the telescopic cylinder is retracted to pull the mounting frame, so that the plurality of binding wheels are away from the winding shaft, and the tensile property experiment is carried out, the telescopic cylinder is elongated to push the mounting frame, so that the plurality of binding wheels are close to the winding shaft, and the compression property experiment is carried out, and the experimental precision is high.

[0008] Preferably, the fixed-torque disengagement structure comprises a plurality of steel balls and a plurality of springs, the bearing inner ring of the binding wheel is provided with a plurality of sliding grooves, the plurality of steel balls are respectively elastically installed in the sliding grooves through the plurality of springs, the bearing outer ring of the binding wheel is provided with a plurality of clamping grooves matched with the steel balls, and the plurality of steel balls are elastically clamped in the clamping grooves; the plurality of springs push the plurality of steel balls out, so that two parts of the plurality of steel balls are clamped in the sliding grooves of the bearing inner ring and the clamping grooves of the outer ring respectively, when the torque between the inner ring and the outer ring of the bearing exceeds a certain value, the outer ring completely presses the plurality of steel balls into the sliding grooves of the inner ring, so that the inner ring and the outer ring of the bearing are disengaged, and a certain resistance is maintained between the inner ring and the outer ring, thereby realizing the fixed-torque function.

[0009] Preferably, the two locking screws are rotatably screwed on the sliding table, and the two locking screws fix the sliding table on the rack; the two locking screws tightly install the sliding table on the rack, and at this time, the telescopic cylinder is retracted or elongated, so as to stretch and compress the radial tire cord, and the structure is simple and practical.

[0010] Preferably, the impact mechanism comprises two sliding blocks, two springs two, two anti-collision plates and two impact hammers, the rack is provided with a sliding groove, the sliding table is slidably connected with the rack through the two sliding blocks, one end of the two springs two is connected with the sliding table, the other end of the two springs two is connected with the rack, the two impact hammers are installed on the left and right ends of the side of the sliding table facing the winding shaft, the two impact hammers are slidably installed in the sliding groove of the rack, and the two impact hammers impact the two anti-collision plates under the action of the power mechanism; when the impact resistance is detected, the two locking screws are loosened, the sliding table is elastically connected with the rack through the two springs two, so that the two impact hammers impact the two anti-collision plates to move the sliding table, the two springs two are automatically reset by the elastic force of the two springs two, a plurality of radial tire cords are tightened, the power mechanism drives the two impact hammers to impact the two anti-collision plates at a certain speed, so that the plurality of radial tire cords are impacted, the vehicle is simulated to walk on the bumpy road, and the power mechanism can be an electromagnetic accelerator, a compressed air mechanism, a spring accumulator mechanism, etc., which is practical.

[0011] Preferably, the bending mechanism includes two mounting seats, two rotating shafts, two eccentric arms, roller shafts, multiple rollers, multiple limiting grooves, and a motor. The two mounting seats are respectively installed on the left and right sides of the frame, located between the winding shaft and the tensioning shaft. The middle portions of the two rotating shafts are rotatably mounted on the two mounting seats, and the inner ends of the two rotating shafts are respectively connected to one end of the two eccentric arms. The two ends of the roller shafts are respectively connected to the other ends of the two eccentric arms. The multiple rollers are rotatably mounted on the roller shafts, and each roller surface is provided with a limiting groove. The motor is mounted on one mounting seat, and the motor's output shaft is connected to the rotating shaft. The transmission components connect multiple limiting grooves to contact multiple radial tire cords. When the motor runs, it drives the rotating shaft to rotate. The rotating shaft drives the roller shaft to rotate around the rotating shaft via an eccentric arm, causing multiple rollers to rotate eccentrically. These eccentrically rotating rollers periodically bend multiple radial tire cords. The multiple limiting grooves limit the movement of the multiple radial tire cords. During the bending process, the multiple rollers follow the rotation of the radial tire cords, thereby reducing wear on the radial tire cords. The motor speed and running time are set, and the fatigue level of the radial tire cords is evaluated after a period of operation.

[0012] Preferably, it also includes two adjustment slots, each of the two eccentric arms is provided with an adjustment slot, the two adjustment slots are arranged along the longitudinal direction of the two eccentric arms, and the two ends of the roller shaft are respectively inserted into the two adjustment slots; by adjusting the position of the two ends of the roller shaft in the two adjustment slots, the distance between the roller shaft and the two rotating shafts is adjusted, thereby changing the degree of eccentricity of the rotation of multiple rollers, so that the bending degree of multiple rollers on multiple radial tire cords is changed, and the versatility is improved.

[0013] Preferably, it also includes two slide rails, which are mounted on the frame, and two mounting seats are slidably connected to the two slide rails respectively; the two mounting seats can be moved along the two slide rails, and a drive mechanism is set to make the two mounting seats move automatically. During the experiment, multiple rollers can bend at different positions of multiple radial tire cords, improving versatility.

[0014] The preferred experimental method for detecting the resonant frequency of radial tire cords is as follows:

[0015] 1. Set the motor speed from 0 rpm to the maximum speed to be divided into N equal segments, and take the middle speed of each segment as the experimental speed, for a total of N groups;

[0016] 2. Set the experimental time for each group to be 1 to 5 minutes after the rotation speed stabilizes;

[0017] 3. Start the motor to begin the test, observe and measure the amplitude of the radial tire cords, and record the amplitude data;

[0018] Four, compare the amplitude data, select the largest amplitude of the rotating speed group, and further detect the corresponding rotating speed section of the rotating speed group according to steps one and two to determine the meridian tire cord resonance frequency.

[0019] Compared with the prior art, the beneficial effects of the present application are that: one end of a plurality of meridian tire cords is clamped in the fixed clamping part, the other end of the plurality of meridian tire cords is clamped in the movable clamping part, and the initial stress of the plurality of meridian tire cords is adjusted to be the same through the movable clamping part, the fixed clamping part and the movable clamping part are locked, the movable clamping part is operated to move away from the fixed clamping part, so as to stretch the plurality of meridian tire cords, until the tension value detected by the force measuring part reaches a set value or the meridian tire cord is broken, the tensile resistance performance detection is completed and the experimental results are recorded; after replacing the plurality of meridian tire cords clamped, the movable clamping part is operated to move close to the fixed clamping part, so that the plurality of meridian tire cords are compressed to be loose, the force measuring part detects the pressure value, the compression resistance performance detection is completed and the data is recorded; after replacing the plurality of meridian tire cords, the impact mechanism is operated to impact the movable clamping mechanism, the force measuring part detects the instantaneous tension value, the impact degree is adjusted until a set value or the meridian tire cord is broken, the impact resistance performance detection is completed and the data is recorded; after replacing the plurality of meridian tire cords, the movable clamping part stretches the plurality of meridian tire cords to a set tension, the operating frequency of the bending mechanism is set, the bending mechanism periodically bends the plurality of meridian tire cords, simulates the influence of the periodic deformation of the tire on the meridian tire cord when the vehicle is running, until the meridian tire cord is broken, a plurality of experiments of different frequencies are carried out, so as to detect the fatigue degree of the meridian tire cord, and record the experimental results; after replacing the plurality of meridian tire cords, the operating frequency of the bending mechanism is adjusted from low to high, each frequency is operated for a period of time, the self-resonant frequency of the meridian tire cord is determined by comparing the amplitude of the meridian tire cord at each frequency, a plurality of mechanical performance experiments are completed by one experimental machine, which has multiple functions, and the stress of the plurality of meridian tire cords is the same, the experimental precision is high, and the experimental deviation is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic diagram of the present application;

[0021] Figure 2 is an axonometric structural schematic diagram of the present application;

[0022] Figure 3 is an exploded structural schematic diagram of the fixed clamping part and the like;

[0023] Figure 4 is an axonometric structural schematic diagram of the movable clamping part and the like;

[0024] Figure 5 is a bottom axonometric structural schematic diagram of the movable clamping part and the like;

[0025] Figure 6 is a schematic view of a front structure of a structure such as a binding wheel;

[0026] Figure 7 is a schematic view of a structure of a bending mechanism;

[0027] In the drawings, reference numeral 1 is a frame, 2 is a winding shaft, 3 is a pressing plate, 4 is a worm gear box, 5 is a force sensor, 6 is a sliding table, 7 is a telescopic cylinder, 8 is a mounting frame, 9 is a tensioning shaft, 10 is a worm gear box two, 11 is a binding wheel, 12 is a brake drum, 13 is a steel ball, 14 is a spring, 15 is a locking screw, 16 is a sliding block, 17 is a spring two, 18 is an anti-collision plate, 19 is a hammer, 20 is a mounting seat, 21 is a rotating shaft, 22 is an eccentric arm, 23 is a roller shaft, 24 is a roller, 25 is a limiting groove, 26 is a motor, 27 is an adjusting groove, and 28 is a sliding rail. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Example 1

[0029] As Figures 1 to 6As shown, a kind of mechanical performance testing machine of radial tire cord, including rack 1;Also include clamping mechanism, the clamping mechanism includes fixed clamping part and movable clamping part, the fixed clamping part is fixedly installed on rack 1, fixed clamping part is provided with force measuring component, the movable clamping part is lockable slidingly installed on rack 1, movable clamping part is provided with the structure of adjusting multiple radial tire cord to the same stress, the fixed clamping part and movable clamping cooperate and hold the two ends of multiple radial tire cord, and the tensile and compression experiment of multiple radial tire cord is carried out;Also include impact mechanism, the impact mechanism is installed on rack 1, impact mechanism impacts movable clamping part in the direction away from fixed clamping part, experimental radial tire cord impact resistance;Also include bending mechanism, the bending mechanism is between fixed clamping part and movable clamping part, bending mechanism periodically bends and vibrates multiple tight radial tire cord, experimental radial tire cord fatigue degree, and detect the resonant frequency of radial tire cord;Fixed clamping part includes winding shaft 2, two pressing plates 3, two worm gear boxes 4 and two force sensors 5, winding shaft 2 is provided with the clamping groove along the axial direction, the two pressing plates 3 are in the clamping groove, multiple compression bolts are rotatably screwed on winding shaft 2, the inner end of multiple compression bolts is rotatably connected with two pressing plates 3 respectively, the left and right ends of winding shaft 2 are respectively connected with two worm gear boxes 4 through central shaft, and two worm gear boxes 4 are installed on rack 1 through two force sensors 5 respectively;Movable clamping part includes sliding table 6, telescopic cylinder 7, mounting frame 8, tensioning shaft 9, two worm gear boxes two 10, multiple binding wheels 11 and multiple brake drums 12, sliding table 6 is installed on rack 1, the fixed end of telescopic cylinder 7 is installed on sliding table 6, the piston rod of telescopic cylinder 7 is connected with mounting frame 8, mounting frame 8 is slidingly installed on sliding table 6, and the two ends of mounting frame 8 are both provided with worm gear box two 10, the two ends of tensioning shaft 9 are respectively connected with two worm gear boxes two 10, and the middle part of tensioning shaft 9 is provided with multiple binding wheels 11 and multiple brake drums 12, multiple binding wheels 11 are provided with bearing and fixed-torque release structure, the inner ring and outer ring of the bearing are connected in fixed torque by the fixed-torque release structure, the inner ring of the bearing is fixedly sleeved on tensioning shaft 9, multiple binding wheels 11 are provided with the structure of binding radial tire cord, the side surface of multiple binding wheels 11 is provided with the friction disc matched with brake drum 12, and multiple brake drums 12 brake and lock multiple binding wheels 11;Fixed-torque release structure includes multiple steel balls 13 and multiple springs 14, the inner ring of the bearing of binding wheel 11 is provided with multiple sliding grooves, multiple steel balls 13 are elastically installed in the sliding groove through multiple springs 14, and the outer ring of the bearing of binding wheel 11 is provided with multiple clamping grooves matched with steel balls 13, and multiple steel balls 13 are elastically clamped in the clamping groove;Also include two locking screws 15, the two locking screws 15 are rotatably screwed on sliding table 6, and the two locking screws 15 fix sliding table 6 on rack 1.

[0030] The ends of the plurality of radial tire cords are inserted into the clamping slots of the winding shaft 2 and extend between the two pressing plates 3. The pressing bolts on the two pressing plates 3 are tightened to firmly clamp the ends of the plurality of radial tire cords. The drive shafts of the two worm gear boxes 4 are rotated to rotate the winding shaft 2, so that the plurality of radial tire cords are wound around the winding shaft 2 for several turns, further improving the clamping firmness. The worm and worm gear cooperation of the two worm gear boxes 4 has a self-locking function to avoid the winding shaft 2 from rotating under stress. The two force sensors 5 check the stress of the plurality of radial tire cords through the two worm gear boxes 4 and the winding shaft 2. The clamping is firm and the operation is simple. The ends of the plurality of radial tire cords are respectively bound to the plurality of binding wheels 11. The elastic force of the plurality of springs 14 pushes the plurality of steel balls 13 out, so that the two parts of the plurality of steel balls 13 are respectively clamped in the sliding slot of the inner ring and the clamping slot of the outer ring of the bearing. The plurality of binding wheels 11 rotate with the tensioning shaft 9. The two worm gear boxes 10 are operated to rotate the tensioning shaft 9. The tensioning shaft 9 drives the plurality of binding wheels 11 to wind the plurality of radial tire cords. When a radial tire cord is tightened and reaches a certain tension, the torque between the inner ring and the outer ring of the bearing of the corresponding binding wheel 11 exceeds a certain value. The outer ring completely presses the plurality of steel balls 13 into the sliding slot of the inner ring, so that the inner and outer rings of the bearing are separated, and a certain resistance is maintained between the inner and outer rings, realizing the function of constant torque, so that this binding wheel 11 maintains tension and does not wind the radial tire cord. Continue to operate the worm gear box 10 to rotate the tensioning shaft 9 until the bearings of all binding wheels 11 are disconnected. At this time, the tension of all radial tire cords is adjusted to the same value. The plurality of brake drums 12 are operated to frictionally brake the plurality of binding wheels 11. The worm and worm gear cooperation of the two worm gear boxes 10 has a self-locking function to avoid the tensioning shaft 9 from rotating under stress. The telescopic cylinder 7 is retracted to pull the mounting frame 8, so that the plurality of binding wheels 11 move away from the winding shaft 2, thereby stretching the plurality of radial tire cords. Until the tension value detected by the two force sensors 5 reaches a set value or the radial tire cord breaks, the tensile resistance performance detection is completed and the experimental results are recorded. After replacing the plurality of radial tire cords, the telescopic cylinder 7 is operated to extend and push the mounting frame 8, so that the plurality of binding wheels 11 approach the winding shaft 2, and the plurality of radial tire cords are compressed to be loose. The two force sensors 5 detect the pressure value, complete the compression resistance performance detection, and record the data. After replacing the plurality of radial tire cords, the impact mechanism is operated to impact the clamping mechanism. The force component detects the instantaneous tension value. The impact degree is adjusted until a set value is reached or the radial tire cord breaks. The impact resistance performance detection is completed and the data is recorded. After replacing the plurality of radial tire cords, the movable clamping part stretches the plurality of radial tire cords to a set tension. The operating frequency of the bending mechanism is set. The bending mechanism periodically bends the plurality of radial tire cords to simulate the influence of periodic deformation of the tire on the radial tire cord when the vehicle is running. Until the radial tire cord breaks, a plurality of experiments with different frequencies are performed to detect the fatigue degree of the radial tire cord and record the experimental results.After replacing a plurality of radial tire cords, the operating frequency of the bending mechanism is adjusted from low to high, each frequency is operated for a period of time, the amplitude of the radial tire cord at each frequency is compared to determine its own resonant frequency, a multifunctional experimental machine is realized, the stress of the plurality of radial tire cords is the same, the experimental precision is high, and the experimental deviation is reduced. Embodiment 2

[0031] As shown in Figure 1 , Figure 2 , Figure 4 and Figure 5 , a mechanical property testing machine for radial tire cords comprises a rack 1; further comprising a clamping mechanism, the clamping mechanism comprises a fixed clamping part and a movable clamping part, the fixed clamping part is fixedly installed on the rack 1, the fixed clamping part is provided with a force measuring part, the movable clamping part is lockably and slidably installed on the rack 1, the movable clamping part is provided with a structure for adjusting a plurality of radial tire cords to the same stress, the fixed clamping part and the movable clamping part cooperate to clamp both ends of the plurality of radial tire cords, and the plurality of radial tire cords are subjected to stretching and compression experiments; further comprising an impact mechanism, the impact mechanism is installed on the rack 1, the impact mechanism impacts the movable clamping part in a direction away from the fixed clamping part, and the impact mechanism tests the impact resistance of the radial tire cord; further comprising a bending mechanism, the bending mechanism is located between the fixed clamping part and the movable clamping part, the bending mechanism periodically bends and vibrates the plurality of stretched radial tire cords, tests the fatigue degree of the radial tire cord, and detects the resonant frequency of the radial tire cord; the impact mechanism comprises two sliding blocks 16, two springs 17, two anti-collision plates 18 and two impact hammers 19, the rack 1 is provided with a sliding groove, the sliding table 6 is slidably connected to the sliding groove through the two sliding blocks 16, one end of the two springs 17 is connected to the sliding table 6, the other end of the two springs 17 is connected to the rack 1, the two impact hammers 19 are installed on the left and right ends of the side of the sliding table 6 facing the winding shaft 2, the two impact hammers 19 are slidably installed in the sliding groove of the rack 1, and the two impact hammers 19 impact the two anti-collision plates 18 under the action of the power mechanism.

[0032] When detecting the impact resistance, the two locking screws 15 are loosened, the sliding table 6 is elastically connected to the rack 1 through the two springs 17, the two impact hammers 19 impact the two anti-collision plates 18 to move the sliding table 6, the two springs 17 automatically reset the sliding table 6 after the movement, the plurality of radial tire cords are stretched, the power mechanism drives the two impact hammers 19 to impact the two anti-collision plates 18 at a certain speed, the plurality of radial tire cords are subjected to impact force, the vehicle driving on a bumpy road is simulated, and the power mechanism can be an electromagnetic accelerator, a compressed air mechanism, a spring accumulator mechanism, etc., which has good practicability. Embodiment 3

[0033] As shown in Figure 1 ,Figure 2 and Figure 7 As shown in the figure, a mechanical performance testing machine for radial tire cord includes a frame 1; further includes a clamping mechanism, the clamping mechanism includes a fixed clamping part and a movable clamping part, the fixed clamping part is fixedly installed on the frame 1, the fixed clamping part is provided with a force measuring part, the movable clamping part is lockably and slidingly installed on the frame 1, the movable clamping part is provided with a structure for adjusting multiple radial tire cords to the same stress, the fixed clamping part and the movable clamping part cooperate to clamp both ends of the multiple radial tire cords, and the multiple radial tire cords are subjected to tensile and compressive tests; further includes an impact mechanism, the impact mechanism is installed on the frame 1, and the impact mechanism impacts the movable clamping part in a direction away from the fixed clamping part, and the impact mechanism tests the impact resistance of the radial tire cord; further includes a bending mechanism, the bending mechanism is located between the fixed clamping part and the movable clamping part, the bending mechanism periodically bends and vibrates the multiple stretched radial tire cords, tests the fatigue degree of the radial tire cord, and detects the resonant frequency of the radial tire cord; the bending mechanism includes two mounting seats 20, two rotating shafts 21, two eccentric arms 22, a roller shaft 23, multiple rollers 24, multiple limiting grooves 25 and a motor 26, the two mounting seats 20 are respectively installed on the left and right sides of the frame 1, the two mounting seats 20 are located between the winding shaft 2 and the tensioning shaft 9, the middle parts of the two rotating shafts 21 are respectively rotatably installed on the two mounting seats 20, the inner ends of the two rotating shafts 21 are respectively connected with one end of the two eccentric arms 22, the two ends of the roller shaft 23 are respectively connected with the other end of the two eccentric arms 22, the multiple rollers 24 are respectively rotatably installed on the roller shaft 23, the limiting grooves 25 are arranged on the wheel faces of the multiple rollers 24, the motor 26 is installed on one of the mounting seats 20, the output shaft of the motor 26 is drivingly connected with the rotating shaft 21 through a transmission assembly, and the multiple limiting grooves 25 respectively contact with the multiple radial tire cords; further includes two adjusting grooves 27, the two eccentric arms 22 are respectively provided with the two adjusting grooves 27, the two adjusting grooves 27 are arranged along the longitudinal direction of the two eccentric arms 22, and the two ends of the roller shaft 23 are respectively inserted into the two adjusting grooves 27; further includes two sliding rails 28, the two sliding rails 28 are installed on the frame 1, and the two mounting seats 20 are respectively slidingly connected with the two sliding rails 28.

[0034] The motor 26 is operated, the motor 26 drives the rotating shaft 21 to rotate, the rotating shaft 21 drives the roller shaft 23 to rotate around the rotating shaft 21 through the eccentric arm 22, so that the plurality of rollers 24 rotate eccentrically, the plurality of rollers 24 periodically bend the plurality of meridian tire cords, the plurality of limiting grooves 25 limit the plurality of meridian tire cords, in the bending process, the plurality of rollers 24 rotate with the meridian tire cords, thereby reducing the wear of the meridian tire cords, the rotating speed of the motor 26 is set, the running time is set, the fatigue degree of the meridian tire cord is evaluated after working for a period of time; the positions of the two ends of the roller shaft 23 in the two adjusting grooves 27 are adjusted, so that the distance between the roller shaft 23 and the two rotating shafts 21 is adjusted, and then the eccentricity of the rotation of the plurality of rollers 24 is changed, so that the bending degree of the plurality of rollers 24 to the plurality of meridian tire cords is changed, the versatility is improved, the two mounting seats 20 are moved along the two sliding rails 28, the driving mechanism is set to automatically move the two mounting seats 20, and the plurality of rollers 24 can bend the plurality of meridian tire cords at different positions during the experiment, thereby improving the versatility.

[0035] As Figures 1 to 7As shown, the mechanical property testing machine for the radial tire cord of the application, in operation, first clamps one end of a plurality of radial tire cords on the winding shaft 2, clamps the other end of the plurality of radial tire cords on the binding wheel 11, and adjusts the initial stress of the plurality of radial tire cords to be the same, locks the sliding table 6 on the rack 1 through the high-speed locking screw 15, retracts the mounting frame 8 by the telescopic cylinder 7, so that the plurality of binding wheels 11 are away from the winding shaft 2, thereby stretching the plurality of radial tire cords, until the tension value detected by the two force sensors 5 reaches a set value or the radial tire cord is broken, the tensile property detection is completed, and the experimental results are recorded; then replace the clamped plurality of radial tire cords, extend the mounting frame 8 by the telescopic cylinder 7, so that the plurality of binding wheels 11 are close to the winding shaft 2, so that the plurality of radial tire cords are compressed to be loose, the two force sensors 5 detect the pressure value, the compression resistance performance detection is completed, and the data is recorded; then replace the plurality of radial tire cords, operate the two hammers 19 to hit the two bumpers 18, the two force sensors 5 detect the instantaneous tension value, adjust the impact force until a set value or the radial tire cord is broken, complete the impact resistance performance detection and record the data; then replace the plurality of radial tire cords, retract the plurality of radial tire cords to a set tension by the telescopic cylinder 7, set the running speed of the motor 26, periodically bend the plurality of radial tire cords by the plurality of rollers 24, simulate the influence of the periodic deformation of the tire on the radial tire cord when the vehicle is running, until the radial tire cord is broken, perform a plurality of experiments with different frequencies, thereby detecting the fatigue degree of the radial tire cord, and recording the experimental results; finally, replace the plurality of radial tire cords, adjust the running frequency of the motor 26 from low to high, run for a period of time at each frequency, and determine the natural frequency of the radial tire cord by comparing the amplitude of the radial tire cord at each frequency.

[0036] The main functions realized by the application are:

[0037] It has multiple functions, and a test machine can complete multiple mechanical property tests.

[0038] It can make the stress of the plurality of radial tire cords the same, and reduce experimental deviation.

[0039] It can detect the natural frequency of the radial tire cord.

[0040] The radial tire cord mechanical property testing machine of the present application is installed, connected or arranged in a common mechanical manner, and can be implemented as long as the beneficial effects can be achieved; the telescopic cylinder 7, the worm gear box 4, the force sensor 5, the worm gear box two 10, the brake drum 12, the steel ball 13, the spring 14, the locking screw 15, the spring two 17, the hammer 19, the roller 24, the motor 26 and the sliding rail 28 of the radial tire cord mechanical property testing machine of the present application are purchased on the market, and the technical personnel in the industry only need to install and operate according to the attached instruction manual, without the need for the technical personnel in the field to pay creative labor.

[0041] All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0042] The above is only the preferred embodiment of the present application, and it should be noted that for those skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should be considered as the protection scope of the present application.

Claims

1. A mechanical performance tester for radial tire cords, comprising a frame (1), characterized in that, It also includes a clamping mechanism, the clamping mechanism includes a fixed clamping part and a movable clamping part, the fixed clamping part is fixedly installed on the frame (1), the fixed clamping part is provided with a force measuring part, the movable clamping part is lockably and slidingly installed on the frame (1), the movable clamping part is provided with a structure for adjusting multiple radial tire cords to the same stress, the fixed clamping part and the movable clamping part cooperate to clamp both ends of the multiple radial tire cords, and the multiple radial tire cords are subjected to stretching and compression test; It also includes an impact mechanism, the impact mechanism is installed on the frame (1), the impact mechanism impacts the movable clamping part in a direction away from the fixed clamping part, and the impact performance of the radial tire cords is tested; It also includes a bending mechanism between the fixed clamping part and the movable clamping part, the bending mechanism periodically bends and vibrates the multiple stretched radial tire cords, tests the fatigue degree of the radial tire cords, and detects the resonance frequency of the radial tire cords; The movable clamping part includes a sliding table (6), a telescopic cylinder (7), a mounting frame (8), a tensioning shaft (9), two worm gear boxes (10), multiple binding wheels (11) and multiple brake drums (12), the sliding table (6) is installed on the frame (1), the fixed end of the telescopic cylinder (7) is installed on the sliding table (6), the piston rod of the telescopic cylinder (7) is connected with the mounting frame (8), the mounting frame (8) is slidingly installed on the sliding table (6), both ends of the mounting frame (8) are provided with the worm gear boxes (10), both ends of the tensioning shaft (9) are drivingly connected with the two worm gear boxes (10), the middle part of the tensioning shaft (9) is provided with the multiple binding wheels (11) and the multiple brake drums (12), the multiple binding wheels (11) are provided with bearings and a fixed-torque disengagement structure, the fixed-torque disengagement structure fixedly connects the inner ring and the outer ring of the bearing, the inner ring of the bearing is fixedly sleeved on the tensioning shaft (9), the multiple binding wheels (11) are provided with a structure for binding the radial tire cords, the side surface of the multiple binding wheels (11) is provided with friction discs matched with the brake drums (12), and the multiple brake drums (12) brake and lock the multiple binding wheels (11).

2. A machine for testing the mechanical properties of a radial tire cord as set forth in claim 1, characterized in that, The fixed clamping part includes a winding shaft (2), two pressing plates (3), two worm gear boxes (4) and two force sensors (5), the winding shaft (2) is provided with a clamping groove in the axial direction, the two pressing plates (3) are located in the clamping groove, multiple pressing bolts are rotationally screwed on the winding shaft (2), the inner ends of the multiple pressing bolts are rotationally screwed with the two pressing plates (3) respectively, the left and right ends of the winding shaft (2) are drivingly connected with the two worm gear boxes (4) through center shafts, and the two worm gear boxes (4) are installed on the frame (1) through the two force sensors (5).

3. A machine for testing the mechanical properties of a radial tire cord as set forth in claim 1, characterized in that, The fixed-torque disengaging structure comprises a plurality of steel balls (13) and a plurality of springs (14), a plurality of sliding grooves are arranged on the inner ring of the bearing of the tightening wheel (11), the plurality of steel balls (13) are respectively elastically installed in the sliding grooves through the plurality of springs (14), a plurality of clamping grooves matched with the steel balls (13) are arranged on the outer ring of the bearing of the tightening wheel (11), and the plurality of steel balls (13) are elastically clamped in the clamping grooves.

4. A machine for testing the mechanical properties of a radial tire cord as set forth in claim 1, wherein Further comprising two locking screws (15) which are rotatably screwed on the sliding table (6), and the two locking screws (15) fix the sliding table (6) on the rack (1).

5. A machine for testing the mechanical properties of a cord for radial tires as claimed in claim 1, characterized in that, The impact mechanism comprises two sliding blocks (16), two springs (17), two anti-collision plates (18) and two impact hammers (19), the rack (1) is provided with a sliding groove, the sliding table (6) is slidably connected to the sliding groove through the two sliding blocks (16), one end of the two springs (17) is connected to the sliding table (6), the other end of the two springs (17) is connected to the rack (1), the two impact hammers (19) are installed on the left and right ends of the side of the sliding table (6) facing the winding shaft (2), the two impact hammers (19) are slidably installed in the sliding groove of the rack (1), and the two impact hammers (19) impact the two anti-collision plates (18) under the action of the power mechanism.

6. A machine for testing the mechanical properties of a radial tire cord as set forth in claim 1, characterized in that, The bending mechanism comprises two mounting seats (20), two rotating shafts (21), two eccentric arms (22), a roller shaft (23), a plurality of rollers (24), a plurality of limiting grooves (25) and a motor (26), the two mounting seats (20) are respectively mounted on the left and right sides of the rack (1), the two mounting seats (20) are located between the winding shaft (2) and the tensioning shaft (9), the middle portions of the two rotating shafts (21) are rotatably installed on the two mounting seats (20) respectively, the inner ends of the two rotating shafts (21) are respectively connected to one end of the two eccentric arms (22), the two ends of the roller shaft (23) are respectively connected to the other end of the two eccentric arms (22), the plurality of rollers (24) are rotatably installed on the roller shaft (23) respectively, the wheel faces of the plurality of rollers (24) are all provided with the limiting grooves (25), the motor (26) is installed on one of the mounting seats (20), the output shaft of the motor (26) is drivingly connected with the rotating shaft (21) through a transmission assembly, and the plurality of limiting grooves (25) are respectively in contact with a plurality of meridian tire cords.

7. A machine for testing the mechanical properties of a radial tire cord as set forth in claim 6, characterized in that, Further comprising two adjusting grooves (27), the two eccentric arms (22) are all provided with the adjusting grooves (27), the two adjusting grooves (27) are arranged along the longitudinal direction of the two eccentric arms (22), and the two ends of the roller shaft (23) are respectively inserted into the two adjusting grooves (27).

8. A machine for testing the mechanical properties of a radial tire cord as set forth in claim 6, wherein Further comprising two sliding rails (28), the two sliding rails (28) are installed on the rack (1), and the two mounting seats (20) are slidably connected with the two sliding rails (28) respectively.

9. A machine for testing the mechanical properties of a cord for radial tires as claimed in claim 1 or 6, characterized in that, The experimental method for detecting the resonance frequency of the meridian tire cord is: I. The rotating speed of the motor (26) is divided into N sections from 0 rpm to the highest rotating speed, the middle rotating speed of each section is taken as the experimental rotating speed, and there are N groups in total; II. The experimental time of each group is set to be 1 min to 5 min after the rotating speed is stabilized. III. Start the motor (26) to test, observe and measure the amplitude of the radial tire cord, record the amplitude data; IV. Compare the amplitude data, select the largest amplitude speed group, further detect the corresponding speed section of the speed group according to steps I and II, and determine the radial tire cord resonance frequency.

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