A method and device for testing heat resistance of fiber cord

Abstract

The invention discloses a method and a device for testing the heat resistance of a fiber cord, and relates to the technical field of heat resistance detection of fiber cords. The invention comprises a sample preparation mold arranged in a vulcanizer body, and tension components are arranged on both sides of the sample preparation mold; on the one hand, the invention realizes the synchronous vulcanization and H extraction test of the fiber cord based on a displacement component and a tension component arranged on the vulcanizer, and can realize a continuous testing function in a process of taking and discharging materials in a cycle, which is beneficial to a comprehensive evaluation of the heat resistance of the fiber cord; on the other hand, an intelligent industrial control module is combined with an auxiliary setting of an automatic control structure, so that the data of the fiber cord in the heat resistance test process is intelligently supervised and processed, and the real level of data processing is fed back by the ratio result of the double-stage heat resistance value, and the ratio result is used to reflect whether the heat resistance value presents a linear change trend, and finally judges whether the heat resistance of the fiber cord meets the tire performance requirements.

Description

Technical Field

[0001] The invention relates to the technical field of fiber cord heat resistance detection, and in particular to a fiber cord heat resistance performance testing method and device. Background Art

[0002] The heat resistance test of calendered cord is an important part of evaluating its performance stability in high temperature environment. The heat resistance test of cord includes the following methods: thermal stability test, heat aging test, dynamic thermomechanical analysis, bending fatigue test and adhesion performance test. The above test methods together constitute a comprehensive heat resistance evaluation system. After combining, the heat resistance performance of cord in high temperature environment can be fully evaluated, providing a scientific basis for the design and use of rubber products.

[0003] The H-extraction method, or H-extraction test, is a test method for determining the static bonding strength between the cord and rubber. The specific method is to bury both ends of the cord in a rubber block according to a specified length to form an "H"-shaped specimen, and then measure the torque required to extract a single cord from the rubber block. The magnitude of this force reflects the bonding ability between the fiber cord and the rubber. However, it was found through testing that the existing national standard for the H-extraction test cannot meet the actual requirements. Even if the fiber cord passes the test, there is still a very high probability that the rubber cord will separate during the later use of the tire.

[0004] It has been found through research that the heat resistance of fiber cords is closely related to temperature and time. The experimental method of the present invention is specifically that the cords are tested by applying the H extraction method and completed under different high temperature environments. The bonding strength between the cords and the substrate under different temperature environments can not only directly reflect the heat resistance of the cords, but also analyze the change trend of the heat resistance of the cords with changes in temperature and time. However, in the heat resistance test of fiber cords of different specifications, the prior art cannot make the vulcanization and H extraction tests be carried out simultaneously, and thus the heat resistance test of the fiber cords at different temperatures and different times cannot be obtained, which is not conducive to the comprehensive evaluation of the heat resistance of the cords;

[0005] To this end, this application proposes a solution. Summary of the invention

[0006] The purpose of the present invention is to provide a method and device for testing the heat resistance of fiber cords, which is used to solve the problem that vulcanization and H extraction tests cannot be carried out simultaneously during the heat resistance test of fiber cords, and it is difficult to complete continuous cyclic testing of the heat resistance of fiber cords at different temperatures and different times.

[0007] The object of the present invention can be achieved by the following technical scheme: a fiber cord heat resistance test device, comprising a sample preparation mold arranged in a vulcanizer body, and tension components are arranged on both sides of the sample preparation mold, and a control panel is installed outside the vulcanizer body;

[0008] The sample preparation mold comprises a fixed mold body and a movable mold plate, a side mold plate is slidably mounted on the outer side of the upper surface of the fixed mold body, and a plurality of mold cavities for preparing the test body are commonly arranged between the fixed mold body, the movable mold plate and the side mold plate;

[0009] The tension component includes a tensile gauge body symmetrically arranged outside the fixed mold body, and a pull tab for pulling the sample block outward is slidably installed at the output end of the tensile gauge body; a displacement component for cyclically taking in and out materials of the test body is horizontally installed on the front side of the vulcanizer body corresponding to the sample preparation mold.

[0010] It is further configured as follows: a second motor is installed on the front side of the dynamometer body, a screw is installed on the output end of the second motor, guide rods are installed on both sides of the screw, a moving seat slidably connected to the guide rods is installed on the external thread of the screw, a bottom hollow cylinder is installed at the front end of the moving seat, and the lower side of the front end of the bottom hollow cylinder is hinged to the pull tab.

[0011] It is further configured as follows: a receiving groove adapted to the width of the pull tab is opened at the bottom of the bottom hollow tube, and the pull tab is hinged backward into the receiving groove to be clamped with the bottom hollow tube.

[0012] It is further configured as follows: the shift assembly includes a cylinder installed in the middle of one side of the vulcanizer body through a fixed seat, the output end of the cylinder is connected to the outer side of the fixed mold body, and motor 1 is installed on both sides of the vulcanizer body corresponding to the cylinder, and a driving gear is installed at the output end of the motor 1, and a rack is meshed outside the driving gear, and a derivation rod slidably connected to the vulcanizer body is installed on the rack.

[0013] It is further configured as follows: iron sheets are installed on the outer sides of the ends of a pair of side templates through countersunk holes, and a magnetic block that is magnetically attracted to the iron sheets is installed at the front end of the lead-out rod.

[0014] It is further configured as follows: an upper pressing plate and a lower pressing plate are installed inside the vulcanizer body through guide pillars, a cooling plate is installed at intervals at the lower end of the guide pillar, and heating components are embedded in the proximal ends of the upper pressing plate and the lower pressing plate.

[0015] It is further configured as follows: a discharging rack is installed on the outer side of the vulcanizing machine body corresponding to the lower pressing plate, and a receiving plate with a flush top is embedded and installed on the discharging rack.

[0016] It is further configured that: the control panel is embedded with an industrial control module, and the industrial control module includes a data acquisition unit, a data comparison unit, a time and temperature control unit, an execution feedback unit, and a processor;

[0017] The data acquisition unit is used to obtain the tensile force value LLz applied by the tensile meter to the test body and the time temperature value SWz currently applied to the test body during the heat resistance test of the fiber cord, and send the tensile force value LLz and the time temperature value SWz to the data comparison unit via the processor;

[0018] After receiving the tension value LLz and the time temperature value SWz, the data comparison unit immediately compares and analyzes the tension threshold and the time temperature threshold preset in the processor to obtain evaluation information, and sends the evaluation information to the time temperature control unit. The time temperature control unit generates a heat resistance qualified signal and a heat resistance unqualified signal according to the evaluation information and sends them to the execution feedback unit, and at the same time regulates the heating temperature and duration of the heating component;

[0019] The execution feedback unit controls the start of the cylinder, motor 1 and motor 2 after receiving the heat resistance performance qualified signal and the heat resistance performance unqualified signal, thereby completing the continuous cycle heat resistance performance test of the test body.

[0020] A method for testing heat resistance of fiber cords comprises the following steps:

[0021] Step 1: Select the cord and divide it into three equal parts;

[0022] Step 2: Select the rubber and divide it into three equal parts, and then make three test bodies with the cord and the sample block;

[0023] Step 3: The test piece is placed in the vulcanizer body and vulcanized at a gradually increasing temperature;

[0024] Step 4: After vulcanization at each temperature, immediately perform H extraction force test through the tension assembly;

[0025] Step 5: After the test is completed, compare the test results.

[0026] The present invention has the following beneficial effects:

[0027] 1. The present invention aims at the technical problem that the vulcanization and H extraction test during the heat resistance test of the fiber cord cannot be carried out synchronously, and thus the continuous cycle test of the heat resistance performance of the fiber cord at different temperatures and different times cannot be completed; on the one hand, the displacement component and the tension component set on the vulcanizer are used to realize the synchronous vulcanization and H extraction test of the fiber cord, and the continuous testing function can be realized by the process of taking and discharging materials in a cycle, which is conducive to the comprehensive evaluation of the heat resistance performance of the fiber cord; on the other hand, the intelligent industrial control module is combined with the auxiliary setting of the automatic control structure, so that the data of the fiber cord during the heat resistance test is intelligently supervised and processed, and the real level of data processing is fed back by the ratio result of the double-stage heat resistance value, and the ratio result is used to reflect whether the heat resistance value shows a linear change trend, and finally it is judged whether the heat resistance performance of the fiber cord meets the tire performance requirements;

[0028] 2. In the process of intelligent heat resistance test, the tensile force value applied by the tensile gauge to the test body and the current temperature value applied to the test body are obtained during the heat resistance test of the fiber cord, and the heat resistance value is calculated by the calculation formula and the data comparison is completed simultaneously, and finally a test of whether the heat resistance performance of the fiber cord is qualified or not is formed, and the start control of the continuous cycle test is formed according to the test results, so as to meet the multi-stroke synchronous test of the indoor test and improve the test level and efficiency of the fiber cord. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic diagram of the structure of a fiber cord heat resistance testing method and device proposed by the present invention;

[0031] Figure 2 A rear view schematic diagram of a fiber cord heat resistance testing method and device proposed by the present invention;

[0032] Figure 3 A front view of a fiber cord heat resistance testing device proposed by the present invention;

[0033] Figure 4 This is a disassembled structure diagram of a sample preparation mold of a fiber cord heat resistance performance testing device proposed by the present invention;

[0034] Figure 5 This is a schematic diagram of the installation of a tension component of a fiber cord heat resistance performance testing device proposed by the present invention;

[0035] Figure 6 A schematic diagram of the dimensions of a sample of a fiber cord heat resistance testing device proposed by the present invention;

[0036] Figure 7 This is a sectional view of the separation structure of the vulcanizer body and the mold of a fiber cord heat resistance performance testing device proposed by the present invention;

[0037] Figure 8 This is a structural diagram of a tension component of a fiber cord heat resistance performance testing device proposed by the present invention;

[0038] Fig. 9 This is an installation diagram of a sample preparation mold and a pressing plate of a fiber cord heat resistance performance testing device proposed by the present invention;

[0039] Fig.10 A schematic diagram of separation of a sample and a mold of a fiber cord heat resistance test device proposed by the present invention;

[0040] Fig.11 A cross-sectional view of the internal structure of a mold of a fiber cord heat resistance performance testing device proposed by the present invention;

[0041] Fig.12 This is a schematic diagram of the connection between a mold and a separation component of a fiber cord heat resistance performance testing device proposed by the present invention.

[0042] In the figure: 1. vulcanizer body; 2. test box; 3. discharge rack; 4. receiving plate; 5. control panel; 6. guide column; 7. upper pressure plate; 8. fixed mold body; 9. lower pressure plate; 10. cooling plate; 11. cylinder; 12. lead-out rod; 13. moving mold plate; 14. side mold plate; 15. mold cavity; 16. upper support plate; 17. support groove; 18. motor 1; 19. driving gear; 20. rack; 21. dynamometer body; 22. specimen block; 23. cord; 24. through hole; 25. fixed seat; 26. motor 2; 27. moving seat; 28. guide rod; 29. ​​screw rod; 30. bottom empty cylinder; 31. pull piece; 32. heating assembly; 33. lower support plate; 34. collar rod; 35. pull ring. DETAILED DESCRIPTION

[0043] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] Embodiment 1: In view of the technical problem that the vulcanization and H extraction tests during the heat resistance test of the fiber cord cannot be performed simultaneously, and thus the continuous cycle test of the heat resistance performance of the fiber cord at different temperatures and different times cannot be completed, the following technical solution is proposed:

[0045] Reference Figure 1 - Fig.12 As shown, a fiber cord heat resistance test device in this embodiment includes a sample preparation mold arranged in a vulcanizer body 1, and test boxes 2 are arranged on both sides of the sample preparation mold, and a through hole 24 is opened at a portion of the vulcanizer body 1 corresponding to the test box 2, a tensile component for applying force in a horizontal direction is arranged inside the test box 2, and a control panel 5 is installed outside the vulcanizer body 1;

[0046] The sample preparation mold includes a fixed mold body 8 and a movable mold plate 13, a side mold plate 14 is slidably installed on the outer side of the upper surface of the fixed mold body 8, a plurality of mold cavities 15 for preparing the test body are commonly provided between the fixed mold body 8, the movable mold plate 13 and the side mold plate 14, and lower support plates 33 are arranged at intervals at the bottom between the mold cavities 15 of the fixed mold body 8, an upper support plate 16 is arranged at the lower surface position of the movable mold plate 13 corresponding to the lower support plate 33, and a support groove 17 for the fiber cord to pass through is formed between the lower support plate 33 and the upper support plate 16;

[0047] The tension assembly includes a tensile meter body 21 symmetrically arranged outside the fixed mold body 8, and a pull tab 31 for pulling the sample block 22 outward is slidably installed at the output end of the tensile meter body 21; a displacement assembly for cyclically taking in and discharging materials of the test body is horizontally installed on the front side of the vulcanizer body 1 corresponding to the sample preparation mold, and the test body includes a sample block 22 and a cord 23 arranged at intervals, and both ends of the cord 23 are pre-buried inside the sample block 22, and the length of the cord 23 extending to the inside of the sample block 22 is the same;

[0048] An upper pressing plate 7 and a lower pressing plate 9 are installed inside the vulcanizer body 1 through a guide column 6, a cooling plate 10 is installed at intervals at the lower end of the guide column 6, and a heating component 32 is embedded in the proximal ends of the upper pressing plate 7 and the lower pressing plate 9. A discharge rack 3 is installed on the outer side of the vulcanizer body 1 corresponding to the lower pressing plate 9, and a receiving plate 4 with a flush top is embedded and installed on the discharge rack 3;

[0049] When the test body with unqualified heat resistance performance is extracted from the vulcanizer, it is horizontally moved to the receiving plate 4 on the discharge rack 3. At the same time, the heating components 32 are arranged on the adjacent sides of the upper pressing plate 7 and the lower pressing plate 9, which can effectively complete the real-time and accurate control of the heating temperature. The setting of the cooling component at the bottom is conducive to the cooling and shaping of the sample preparation mold after vulcanization, and is conducive to the rapid molding of the test body to achieve the purpose of compliant heat resistance performance testing;

[0050] Reference Figure 8As shown, a motor 26 is installed on the front side of the dynamometer body 21, a screw 29 is installed on the output end of the motor 26, guide rods 28 are installed on both sides of the screw 29, and a moving seat 27 slidably connected to the guide rods 28 is installed on the external thread of the screw 29, and a bottom hollow cylinder 30 is installed at the front end of the moving seat 27, and the lower side of the front end of the bottom hollow cylinder 30 is hinged to a pull tab 31, and a receiving groove matching the width of the pull tab 31 is opened at the bottom of the bottom hollow cylinder 30, and the pull tab 31 is hinged backward to the receiving groove and is engaged with the bottom hollow cylinder 30. When the pull tab 31 contacts the surface of the sample block 22, the pull tab 31 is flipped upward and stored in the receiving groove. When the pull tab 31 enters between the sample blocks 22, it can complete the vertical drop, and when it moves in the reverse direction, it can complete the pulling of the sample block 22, thereby achieving the purpose of applying tension in the H extraction test;

[0051] When conducting the H extraction force test, the sample preparation mold is separated and the test body is retained between the upper pressing plate 7 and the lower pressing plate 9, and the motor 26 on both sides is started. The output shaft of the motor 26 rotates forward to drive the screw 29 to rotate, and the moving seat 27 moves outside the screw 29 to drive the pull tab 31 to move horizontally between the sample blocks of the test body. When the pull tab 31 passes over the adjacent sample block and falls vertically under the action of the hinge, the motor 26 stops rotating and the output shaft immediately rotates in the opposite direction. The moving seat 27 approaches the motor 26 and pulls the sample blocks on both sides through the pull tab 31. The cord between the sample blocks is subjected to the step-by-step increase of the heating temperature and heating time after vulcanization, and the extraction force is measured when the heating temperature and heating time are 138℃50min, 165℃60min, and 192℃20min, respectively.

[0052] It should be noted that: when the pull tab 31 passes through the upper surface of the sample block, since the pull tab 31 is a one-way bending hinge, the pull tab 31 hits the outside of the sample block to form a bend, and then slides across the surface of the sample block until it falls on the adjacent sides of the two sample blocks. Only then can the pull tab 31 fall down, and after moving in the reverse direction, the pull tab 31 can pull the sample block due to the one-way hinge setting;

[0053] Reference Figure 4 , Figure 5 and Figure 7As shown, the shift assembly includes a cylinder 11 installed in the middle of one side of the vulcanizer body 1 through a fixed seat 25, and the output end of the cylinder 11 is connected to the outer side of the fixed mold body 8. The specific connection method is: a collar rod 34 is installed at the output end of the cylinder 11, and a pull ring 35 is installed in the middle of the outer end of the fixed mold body 8, and the collar rod 34 and the pull ring 35 are sleeved with each other. The vulcanizer body 1 is installed with a motor 18 on both sides of the cylinder 11, and the output end of the motor 18 is installed with a driving gear 19, and the driving gear 19 is meshed with a rack 20. The rack 20 is installed with a lead-out rod 12 that is slidably connected to the vulcanizer body 1, and the outer sides of the ends of a pair of side mold plates 14 are installed with iron sheets through countersunk holes, and the front end of the lead-out rod 12 is installed with a magnetic block that is magnetically attracted to the iron sheets;

[0054] Reference Figure 4 and Figure 5 As shown, during the shifting: the cylinder 11 is started, and the cylinder 11 drives the fixed mold body 8 to move out to the receiving plate 4 on the unloading rack 3, and the tested sample block 22 and the cord are taken out and placed in a new test body, and then reset and vulcanized. After the vulcanization is completed, the motor 18 is started to drive the driving gear 19 to rotate, and the driving gear 19 drives the rack 20 and the output rod 12 to move to abut against the side template 14. At this time, the magnetic block and the iron sheet are in contact and adsorption is completed. The motor 18 is started again and reversed to reset and drive the side template 14 to separate from the fixed mold body 8. At this time, both sides of the sample block 22 are exposed, so as to facilitate the H extraction test.

[0055] Basic principle: Figure 5 and attached Figure 8 It is explained that during the heat resistance test of the fiber cord, on the one hand, the displacement component and the tension component arranged on the vulcanizer can realize the simultaneous vulcanization and H extraction test of the fiber cord, and the continuous testing function can be realized by the process of taking and discharging materials in a cycle, which is beneficial to the comprehensive evaluation of the heat resistance of the fiber cord.

[0056] Embodiment 2: This embodiment is to further optimize the heat resistance test in embodiment 1 intelligently:

[0057] The control panel 5 is embedded with an industrial control module, which includes a data acquisition unit, a data comparison unit, a time and temperature control unit, an execution feedback unit, and a processor;

[0058] The data acquisition unit is used to obtain the tensile force value LLz applied by the tensile meter to the test body and the time temperature value SWz currently applied to the test body during the heat resistance test of the fiber cord, and send the tensile force value LLz and the time temperature value SWz to the data comparison unit via the processor;

[0059] After receiving the tension value LLz and the time temperature value SWz, the data comparison unit immediately compares and analyzes the tension threshold and the time temperature threshold preset in the processor to obtain evaluation information, and sends the evaluation information to the time temperature control unit. The time temperature control unit generates a heat resistance qualified signal and a heat resistance unqualified signal according to the evaluation information and sends them to the execution feedback unit, wherein the generation process of the heat resistance qualified signal and the heat resistance unqualified signal is as follows:

[0060] Step 1: First, obtain the tension value LLz and the time-temperature value SWz, wherein the tension value LLz represents the tension when the fiber cord 23 is broken, and the time-temperature value SWz represents the vulcanization temperature and time of the current test body;

[0061] Step 2: Construct a heat resistance value calculation formula Among them, B is the H extraction force at a heating temperature of 138°C and a heating time of 50 minutes, C is the H extraction force at a heating temperature of 165°C and a heating time of 60 minutes, and D is the H extraction force at a heating temperature of 192°C and a heating time of 20 minutes, that is, the incremental temperature is 27°C, and when the temperature exceeds 190°C, the heating time cannot exceed 20 minutes to prevent the fiber cord from being over-vulcanized and losing its physical properties, which in turn causes distortion of the test data;

[0062] Step 3: Compare and analyze the heat resistance value with the heat resistance threshold [0.96, 1] preset in the processor to obtain evaluation information;

[0063] The comparative analysis process is as follows: when the heat resistance value is greater than or equal to 0.96 and less than or equal to 1, a good heat resistance signal is generated, and the current heating temperature and heating time are recorded;

[0064] When the heat resistance value is less than 0.96, a heat resistance unqualified signal is generated and fed back to the vulcanizer body 1;

[0065] After receiving the heat resistance qualified signal and the heat resistance unqualified signal, the execution feedback unit performs the start control of the cylinder 11, the motor 1 18 and the motor 2 26 to complete the continuous cycle test of the test body, wherein the start control action is as follows:

[0066] Action 1: Material discharging and vulcanization process: When the heat resistance test of the current group is completed, the cylinder 11 is started, and the cylinder 11 drives the fixed mold body 8 to move out to the receiving plate 4 on the unloading rack 3, and the tested sample block 22 and the cord are taken out and put into a new test body, and then reset and vulcanized;

[0067] Action 2: Preparation process for heat resistance test: After vulcanization is completed, the motor 18 is started to drive the driving gear 19 to rotate, and the driving gear 19 drives the rack 20 and the guide rod 12 to move to abut against the side mold 14. At this time, the magnetic block and the iron sheet are in contact and adsorption is completed, and the reset is started to drive the side mold 14 to separate from the fixed mold body 8;

[0068] Action 3: H extraction test process: start the motor 26, the motor 26 drives the moving seat 27 to move through the screw rod 29, and the moving seat 27 drives the pull tab 31 to move to the inside of the sample block 22, and simultaneously applies an outward pulling force, and records the extraction force when the fiber cord is broken;

[0069] Among them, when a heat resistance failure signal is generated, the above-mentioned start control action is made to complete the "pushing out" of the test body, so as to facilitate the placement of the next group of test bodies to be verified. The entire fiber cord heat resistance performance test process realizes intelligent material loading and unloading, reduces the time spent on manual gap adjustment, and thus achieves the purpose of continuous cycle testing;

[0070] It is necessary to add that: refer to Figure 6 As shown, the fiber cords selected for the test are new cords that have not been calendered by a calender, that is, to ensure that the fiber cords have no adhesive attached; and the width of the sampled fiber cords is not less than 100mm, and the length is not less than 200mm, and then the sampled fiber cords are divided into three equal parts; the adhesive material of all test specimens is completely consistent;

[0071] It is important to note that: for the above heat resistance value calculation formula, the ratio of the heat resistance value of the latter section to the heat resistance value of the former section, and the comparative analysis process with the threshold value [0.96,1] can be understood as follows: when the ratio result is closer to 1, it can indicate that the change trend of the heat resistance performance of the tested fiber cord is closer to a linear change, and a linear change indicates that the heat resistance performance of the current tested fiber cord is qualified; conversely, when the ratio result is farther away from 1, it indicates that the change trend of the heat resistance performance of the tested fiber cord is a nonlinear change, that is, a nonlinear change indicates that the heat resistance performance of the current tested fiber cord is unqualified;

[0072] The advantages of the optimization scheme are: the intelligent industrial control module is combined with the auxiliary setting of the automatic control structure, so that the data of the fiber cord during the heat resistance test can be intelligently supervised and processed, the ratio result of the double-stage heat resistance value is used to feedback the actual level of data processing, and the ratio result is used to reflect whether the heat resistance value shows a linear change trend, and finally it is judged whether the heat resistance performance of the fiber cord meets the tire performance requirements.

[0073] Embodiment 3: This embodiment combines the technical contents of Embodiment 1 and Embodiment 2 to form a method for testing the heat resistance of fiber cords, including the following steps:

[0074] Step 1: Select cord 23 and divide it into three equal parts;

[0075] Step 2: Select rubber and divide it into three test blocks 22, and then embed the same length of cord 23 into two test blocks 22 to make three test bodies;

[0076] Step 3: The test body is placed in the vulcanizer body 1 and vulcanized at a temperature increasing setting. During the vulcanization process, the upper pressing plate 7 and the lower pressing plate 9 respectively apply pressure to the mold through the oil pressure equipment, and the vulcanization process is completed at the increasing temperature setting and the corresponding heating time;

[0077] Step 4: After vulcanization at each temperature, the H extraction force test is immediately performed through the tension assembly. Under the settings of the motor 26 and the moving seat 27, the pull tab 31 is translated between the test specimens of the test body. When the pull tab 31 passes over the adjacent test specimens, it falls vertically under the action of the hinge. At this time, the motor 26 stops rotating and the output shaft immediately rotates in the opposite direction. The moving seat 27 approaches the motor 26 and pulls the test specimens on both sides through the pull tab 31. The cords between the test specimens are subjected to the gradual increase of the heating temperature and heating time after vulcanization, and the extraction force is measured when the heating temperature and heating time are 138°C 50min, 165°C 60min, and 192°C 20min, respectively.

[0078] Step 5: After the test, compare the test results and provide real-time feedback on the heat resistance of the fiber cord;

[0079] In summary: on the one hand, the displacement component and tension component set on the vulcanizer can realize the synchronous vulcanization and H extraction test of the fiber cord, and the continuous testing function can be realized by the process of taking and releasing materials in a cycle, which is conducive to the comprehensive evaluation of the heat resistance performance of the fiber cord; on the other hand, the intelligent industrial control module is combined with the auxiliary setting of the automatic control structure, so that the data of the fiber cord in the heat resistance test process is intelligently supervised and processed, and the ratio result of the double-stage heat resistance value is used to feedback the real level of data processing, and the ratio result is used to reflect whether the heat resistance value shows a linear change trend, and finally it is judged whether the heat resistance performance of the fiber cord meets the tire performance requirements;

[0080] The mutual use of the two can effectively verify the heat resistance of the fiber cord by combining the H extraction test with intelligent temperature control during the heat resistance test of the fiber cord, improve the accuracy of the heat resistance test of the fiber cord, and avoid the use of fiber cords that do not meet the tire performance requirements, which may lead to market claims complaints in the future. The continuous testing method can save testing costs and help the development and improvement of tire products.

[0081] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods.

Claims

1. A fiber cord heat resistance testing device, comprising a sample preparation mold arranged in a vulcanizer body (1), and tension components are arranged on both sides of the sample preparation mold, and a control panel (5) is installed outside the vulcanizer body (1), characterized in that: The sample preparation mold comprises a fixed mold body (8) and a movable mold plate (13); a side mold plate (14) is slidably mounted on the outer side of the upper surface of the fixed mold body (8); and a plurality of mold cavities (15) for preparing the test body are provided between the fixed mold body (8), the movable mold plate (13) and the side mold plate (14); The tension component comprises a tensile gauge body (21) symmetrically arranged outside the fixed mold body (8), and a pull tab (31) for pulling the sample block (22) outward is slidably mounted on the output end of the tensile gauge body (21); a displacement component for cyclically taking in and out materials of the test body is horizontally mounted on the front side of the vulcanizer body (1) corresponding to the sample preparation mold; The displacement assembly comprises a cylinder (11) mounted on the middle part of one side of the vulcanizer body (1) through a fixed seat (25), the output end of the cylinder (11) is connected to the outer side of the fixed mold body (8), the vulcanizer body (1) is equipped with a motor (18) on both sides corresponding to the cylinder (11), the output end of the motor (18) is equipped with a driving gear (19), the driving gear (19) is meshed with a rack (20) on the outside, and the rack (20) is equipped with a lead-out rod (12) slidably connected to the vulcanizer body (1); The outer sides of the ends of a pair of side mold plates (14) are both installed with iron sheets through countersunk holes, and the front end of the guide rod (12) is installed with a magnetic block that is magnetically attracted to the iron sheet; the interior of the vulcanizer body (1) is installed with an upper pressure plate (7) and a lower pressure plate (9) through a guide column (6), and a cooling plate (10) is installed at intervals at the lower end of the guide column (6), and heating components (32) are embedded at the proximal ends of the upper pressure plate (7) and the lower pressure plate (9).

2. A fiber cord heat resistance testing device according to claim 1, characterized in that: A second motor (26) is installed on the front side of the dynamometer body (21), a screw (29) is installed on the output end of the second motor (26), guide rods (28) are installed on both sides of the screw (29), a movable seat (27) slidably connected to the guide rod (28) is installed on the external thread of the screw (29), a bottom hollow cylinder (30) is installed at the front end of the movable seat (27), and the lower side of the front end of the bottom hollow cylinder (30) is hinged to the pull tab (31).

3. A fiber cord heat resistance testing device according to claim 2, characterized in that: The bottom of the bottom hollow cylinder (30) is provided with a receiving groove adapted to the width of the pull tab (31), and the pull tab (31) is hinged backwards into the receiving groove to be clamped with the bottom hollow cylinder (30).

4. A fiber cord heat resistance testing device according to claim 1, characterized in that: A discharging rack (3) is installed on the outer side of the vulcanizing machine body (1) corresponding to the lower pressing plate (9), and a receiving plate (4) with a flush top is embedded and installed on the discharging rack (3).

5. A fiber cord heat resistance testing device according to claim 2, characterized in that: The control panel (5) is embedded with an industrial control module, which includes a data acquisition unit, a data comparison unit, a time and temperature control unit, an execution feedback unit, and a processor; The data acquisition unit is used to obtain the tension value LLz applied by the tension component to the test body and the time temperature value SWz currently applied to the test body during the heat resistance test of the fiber cord, and send the tension value LLz and the time temperature value SWz to the data comparison unit via the processor; After receiving the tension value LLz and the time temperature value SWz, the data comparison unit immediately compares and analyzes the tension threshold and the time temperature threshold preset in the processor to obtain evaluation information, and sends the evaluation information to the time temperature control unit. The time temperature control unit generates a heat resistance qualified signal and a heat resistance unqualified signal according to the evaluation information and sends them to the execution feedback unit, and at the same time regulates the heating temperature and duration of the heating component (32); After receiving the heat resistance performance qualified signal and the heat resistance performance unqualified signal, the execution feedback unit performs start control of the cylinder (11), motor one (18) and motor two (26), thereby completing the continuous cycle heat resistance performance test of the test body.

6. A method for testing heat resistance of fiber cords, using a device for testing heat resistance of fiber cords as claimed in any one of claims 1 to 5, characterized in that: The steps include: Step 1: Select the cord (23) and divide it into three equal parts; Step 2: Select rubber and divide it into three equal parts to prepare test pieces (22), and then prepare three test pieces with the cord (23) and the test piece (22); Step 3: The test piece is placed in the vulcanizer body (1) and vulcanized at a gradually increasing temperature; Step 4: After vulcanization at each temperature, immediately perform H extraction force test through the tension assembly; Step 5: After the test is completed, compare the test results.

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