Carbon fiber front fork and hub disc brake fatigue testing machine with heating function

Abstract

The invention provides a carbon fiber front fork and hub disc brake fatigue testing machine with a heating function, which is characterized in that a front fork fixing assembly is fixed on a vertical moving plate through a second hand wheel and a third hand wheel, a test cylinder in a cylinder test assembly is connected with a cylinder transverse moving assembly and the front fork fixing assembly, and the front fork fixing assembly is provided with a heating base. A test cylinder is connected with a force value sensor and a displacement sensor, a fourth hand wheel drives the test cylinder to transversely move, a cylinder transverse moving assembly in a fixing assembly is fixed to a bottom column, a front fork fixing assembly is fixed to a rack column, the rack column is installed on the bottom column, and gas storage tank four-corner fixing ground feet are placed on the lower portion of the bottom column. The control panel is fixed on the stand column of the rack and is internally provided with a fatigue comprehensive test unit; and the fatigue comprehensive test unit is connected with the test cylinder, the force value sensor, the displacement sensor and the heating base. The carbon fiber front fork and hub disc brake fatigue testing machine with the heating function can be used for accurately carrying out a fatigue test and ensuring the reliability of a test result.

Description

Technical Field

[0001] The invention belongs to the technical field of fatigue strength testing equipment, and in particular relates to a carbon fiber front fork and wheel hub disc brake fatigue testing machine with a heating function. Background Art

[0002] The carbon fiber front fork and wheel hub disc brake fatigue tester is a device specially used to test the fatigue performance of carbon fiber front forks and wheel hub disc brakes under long-term and high-frequency use conditions. This tester can simulate various working conditions in actual use and evaluate the durability and reliability of the product.

[0003] At present, in the fatigue test of bicycle parts, traditional testing machines usually lack heating functions and cannot simulate the test environment where the bicycle front fork is in a vibrating state and is affected by brake heat. In addition, the test conditions of the testing machine are single, and different test conditions require frequent replacement of the testing machine. Summary of the invention

[0004] In view of this, the present invention aims to propose a carbon fiber front fork and hub disc brake fatigue testing machine with heating function to solve the problem that in the fatigue test of bicycle parts, traditional testing machines usually lack heating function and cannot simulate the test environment of the bicycle front fork under vibration and affected by brake heat, and the test conditions of the testing machine are single, and different test conditions require frequent replacement of the testing machine.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows: The present invention provides a carbon fiber front fork and wheel hub disc brake fatigue testing machine with a heating function, comprising: a front fork fixing assembly, which is used to fix the carbon fiber front fork and the wheel hub disc brake assembly, and the front fork fixing assembly is fixed to the vertical moving plate through a second hand wheel and a third hand wheel; a cylinder test assembly, which is used to simulate the vibration state of the front fork, and the lower part of the test cylinder inside the cylinder is connected to the cylinder transverse movement assembly and the left side is connected to the front fork fixing assembly, and a heating base is arranged at the front fork fixing assembly, and the heating base heats the wheel hub disc brake, the test cylinder is connected to a force sensor and a displacement sensor, and the cylinder transverse movement assembly drives the test cylinder to move horizontally left and right through a fourth hand wheel driving screw rod; a fixing assembly, which is used to fix other components, the cylinder transverse movement assembly is fixed to the bottom column, and the front fork fixing assembly is fixed to the frame column. A frame column is installed on the upper part of the bottom column, and the four corners of the gas tank are fixed on the lower part of the bottom column. The reinforcing ribs connect the horizontal fixing platform on the upper part of the bottom frame column to the frame column; a control panel is used to control the carbon fiber front fork and wheel hub disc brake fatigue testing machine to perform fatigue testing. The control panel is fixed on the frame column and has a fatigue comprehensive testing unit installed therein. The fatigue comprehensive testing unit is connected to the test cylinder, the force sensor, the displacement sensor, and the heating base. The fatigue comprehensive testing unit adjusts the heating power of the heating base and issues an over-temperature alarm according to the over-temperature of the heating base. Moreover, after the heating base is heated to a preset temperature, a fatigue test is performed and a displacement determination process for determining the deformation of the front fork is performed. Furthermore, the shutdown action determination of the carbon fiber front fork and wheel hub disc brake fatigue testing machine is automatically performed.

[0006] Furthermore, in the cylinder test assembly, one end of the universal joint is connected to the front fork hook of the front fork, the other end of the universal joint is connected to the ball joint, the force sensor is connected to the ball joint and the test cylinder, the test cylinder is fixed on the cylinder fixing bracket, the test cylinder is connected to the displacement sensor, the displacement sensor is used to detect the displacement of the test front fork, the force sensor is used to detect the alternating force applied by the test cylinder, the test cylinder is connected to the air tank through a reversing valve and a proportional valve, the cylinder fixing bracket is fixed to the bottom of the upper surface of the horizontal T-slot plate through a locking bolt and is connected to the cylinder transverse movement assembly, and the test cylinder is connected to the stroke switch.

[0007] Furthermore, the bottom of the cylinder fixed bracket in the cylinder transverse movement assembly is fixed to the horizontal screw support seat, the horizontal screw is fixed to the inner side of the bottom column through the horizontal bracket and the horizontal screw fixed seat, the top of the horizontal screw fixed seat is fixed to the upper horizontal fixed platform, and the fourth hand wheel is fixed to the top of the horizontal screw; when the locking bolt of the cylinder fixed bracket is loosened, the fourth hand wheel is turned, and the cylinder fixed bracket drives the test cylinder to slide left and right along the groove at the sliding connection between the horizontal T-slot plate and the cylinder fixed bracket.

[0008] Furthermore, a heating tube is connected to the heating tube installation position in the heating base, and the front fork of the disc brake is fixed to the heating base through a first fixed installation hole and a second fixed installation hole. A threaded K-type thermocouple is provided in the heating base, and the K-type thermocouple is provided at a middle position between the first fixed installation hole and the second fixed installation hole. The K-type thermocouple is used to detect the real-time temperature of the heating base, and the heating tube is connected to a solid-state relay, and the solid-state relay is used to control the heating tube to open or close.

[0009] Furthermore, a preset temperature and an over-temperature threshold are input into the fatigue comprehensive test unit, and the real-time temperature difference is calculated in the fatigue comprehensive test unit according to the real-time temperature of the heating base and the preset temperature, and the heating power of the heating tube is adjusted according to the comparison between the real-time temperature difference and the over-temperature threshold; when the real-time temperature difference is a negative value, the heating power of the heating tube is increased; when the real-time temperature difference is a positive value and the real-time temperature difference is greater than the over-temperature threshold, the solid-state relay is turned off, and an alarm is given on the control panel; when the real-time temperature difference is a positive value and the real-time temperature difference is less than the over-temperature threshold, the heating power of the heating tube is reduced; the adjustment process of the heating power of the heating tube adopts temperature proportional calculus adjustment.

[0010] Furthermore, the front fork vertical tube is fixed in the front fork bearing seat in the front fork fixing assembly, and the front fork vertical tube is locked on the front fork bearing seat by means of a second hand wheel and a third hand wheel, the vertical movable plate is slidably connected to the vertical T-slot plate, the vertical movable plate is fixed to the vertical screw in the frame column by means of a ball screw nut seat and a screw nut, the top of the vertical screw is connected to the frame column by a first vertical screw support, the bottom of the vertical screw is fixed to the frame column by a second vertical ball screw support, a bevel gear shaft fixing plate is fixed to the bottom of the second vertical ball screw support, a bevel gear shaft is fixed in the bevel gear shaft fixing plate, a bevel gear is arranged at the bottom end of the vertical screw, the bevel gear is meshedly connected with the bevel gear shaft, the bevel gear shaft is fixed to the frame column by a bearing seat, and the first hand wheel is fixed to the top of the bevel gear shaft.

[0011] Furthermore, when the carbon fiber front fork and wheel hub brake fatigue testing machine is carried out During the tilt angle fatigue test, the second angle fixing plate is connected to the vertical moving plate, and the second angle fixing plate is fixed to the short right-angle side of the first angle fixing plate. The T-slot is fixed to the hypotenuse of the first angle fixing plate, The included angle between the T-slot and the horizontal bottom surface of the first angle fixing plate is , The T-slot is connected to the front fork bearing seat in the front fork fixing assembly. During the test, the angle between the front fork riser and the horizontal line is .

[0012] Furthermore, when the front fork is subjected to a vertical test, the front fork axis of the front fork stem is on the same horizontal line with the test cylinder, displacement sensor, and force sensor, and the front fork stem is kept vertically relative to the test cylinder, displacement sensor, and force sensor; when a disc brake test is performed, the front fork axis is on the same horizontal line with the test cylinder, displacement sensor, and force sensor, and the front fork stem is kept in a vertical position.

[0013] Furthermore, the comprehensive test unit determines the force direction of the fatigue test, the horizontal tension value, the vertical force value, the test frequency, and the initial test displacement according to the test process. When the heating base is heated, the indicator light connected to the heating tube lights up. When the real-time temperature detected by the K-type thermocouple of the fatigue comprehensive test unit reaches the preset temperature, a start command is input into the comprehensive test unit, and the comprehensive test unit performs a fatigue test to control the test cylinder to start extending and retracting force. During the fatigue test, an offset ratio value is preset in the comprehensive test unit. The comprehensive test unit calculates the test excess ratio value of the front fork that exceeds the initial test displacement based on the real-time detected offset of the front fork. When the test excess ratio value is greater than the preset offset ratio value, the comprehensive test unit begins to determine the displacement of the front fork deformation.

[0014] Furthermore, the number of test runs is inputted into the comprehensive test unit. When the carbon fiber front fork and wheel hub disc brake fatigue testing machine performs tests at a preset frequency and with determined horizontal tension values ​​and vertical force values, the number of test runs is reduced each time the test is completed until the number of test runs is zero or the stroke switch of the test cylinder detects that the stroke of the test cylinder is at a maximum value. Then, the fatigue comprehensive test unit controls the carbon fiber front fork and wheel hub disc brake fatigue testing machine to shut down as a whole.

[0015] Compared with the prior art, the carbon fiber front fork and wheel hub disc brake fatigue testing machine with heating function described in the present invention has the following advantages: (1) The carbon fiber front fork and wheel hub disc brake fatigue testing machine with heating function described in the present invention is used to simulate the vibration state of the front fork of a bicycle. An alternating force is applied to the fixed front fork. After a certain number of times, the damage is detected. At the same time, the disc brake can be heated to a specified temperature to consider whether the composite material front fork will be significantly degraded under the influence of brake heat. The carbon fiber front fork and wheel hub disc brake fatigue testing machine with heating function is suitable for horizontal fatigue test, vertical fatigue test, Tilt angle fatigue test.

[0016] (2) The real-time temperature of the heating base in the present invention is controlled by temperature PID control. Through closed-loop control of temperature proportional calculus, the temperature fluctuation is controlled within ±1°C. In terms of temperature control, the role of PID control is to adjust the output of the heating tube according to the feedback signal of the temperature sensor to maintain the set target temperature. The proportional part adjusts the output according to the deviation between the current temperature and the target temperature, the integral part adjusts the output according to the accumulation of the deviation, and the differential part adjusts the output according to the speed of the deviation change. The three work together to achieve precise control of temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0018] In the attached picture: Figure 1 It is a front view schematic diagram of a carbon fiber front fork and wheel hub disc brake fatigue testing machine with heating function according to an embodiment of the present invention; Figure 2 This is an enlarged schematic diagram of point A in the front view of the carbon fiber front fork and wheel hub disc brake fatigue testing machine with heating function according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the connection between the front fork shaft and the joint support in the carbon fiber front fork and wheel hub disc brake fatigue testing machine with heating function according to an embodiment of the present invention; Figure 4 A carbon fiber front fork and wheel hub disc brake fatigue testing machine with heating function according to an embodiment of the present invention Schematic diagram of the front fork fixing seat during the test; Figure 5 This is a schematic diagram of the connection between the front fork shaft and the universal joint in the carbon fiber front fork and wheel hub disc brake fatigue testing machine with heating function according to an embodiment of the present invention; Figure 6 It is a side view schematic diagram of a carbon fiber front fork and wheel hub disc brake fatigue testing machine with heating function according to an embodiment of the present invention; Figure 7 It is an enlarged schematic diagram of the vertical screw transmission in the frame column in the side view of the carbon fiber front fork and wheel hub disc brake fatigue testing machine with heating function according to an embodiment of the present invention; Figure 8 This is a simulation schematic diagram of the front fork and wheel hub disc brake assembly in the carbon fiber front fork and wheel hub disc brake fatigue testing machine with heating function according to an embodiment of the present invention.

[0019] Description of reference numerals: 1. Reinforcement ribs; 2. Frame column; 3. Ball screw nut seat; 4. Vertical moving plate; 5. First hand wheel; 6. Screw nut; 7. Bearing seat; 8. First vertical screw support; 9. Vertical T-slot plate; 10. Front fork riser; 11. Front fork bearing seat; 12. Second hand wheel; 13. Third hand wheel; 14. Heating base; 15. Heating tube installation; 16. First fixed installation hole; 17. Second fixed installation hole; 18. Universal joint; 19 , ball joint; 20, force sensor; 21, test cylinder; 22, displacement sensor; 23, cylinder fixing bracket; 24, horizontal T-slot plate; 25, horizontal screw support seat; 26, horizontal bracket; 27, horizontal screw fixing seat; 28, bottom column; 29, ground foot; 30, fourth hand wheel; 31, front fork; 32, front fork hook; 33, second vertical ball screw support; 34, first angle fixing plate; 35, second angle fixing plate; 36, T-slot; 37. Simulated brake disc; 38. Force rod; 39. Front fork shaft; 40. Simulated force column; 41. Brake disc fastener; 42. Control panel; 43. Air tank. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0023] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0024] See also Figure 1-Figure 8 As shown, Figure 8 The middle disc brake includes a simulated brake disc 37, a force rod 38, a front fork shaft 39, a simulated force column 40, and a brake disc fastener 41. The present embodiment provides a carbon fiber front fork and hub disc brake fatigue testing machine with a heating function, including a front fork fixing assembly, which is used to fix the carbon fiber front fork and hub disc brake assembly, and the front fork fixing assembly is fixed on the vertical moving plate 4 by the second hand wheel 12 and the third hand wheel 13; a cylinder test assembly, which is used to simulate the vibration state of the front fork, and the lower part of the test cylinder 21 inside it is connected to the cylinder transverse movement assembly and the left side is connected to the front fork fixing assembly, and a heating base 14 is provided at the front fork fixing assembly, and the heating base 14 heats the hub disc brake, and the test cylinder 21 is connected to the force sensor 20 and the displacement sensor 22, and the cylinder transverse movement assembly drives the screw rod to drive the test cylinder 21 to move horizontally left and right through the fourth hand wheel 30; a fixing assembly, which is used to fix other components, and the cylinder transverse movement assembly is fixed to the bottom column 28, and the front fork fixing assembly is fixed to the frame column 2 is fixed, a frame column 2 is installed on the upper part of the bottom column 28, a gas tank 43 is placed on the lower part of the bottom column 28, and the four corners of the bottom column 28 are fixed with feet 29, and the reinforcing ribs 1 connect the upper horizontal fixing platform of the bottom frame column 2 with the frame column 2; a control panel 42 is used to control the carbon fiber front fork and wheel hub disc brake fatigue testing machine to perform fatigue testing, the control panel is fixed on the frame column 2 and has a fatigue comprehensive testing unit inside, the fatigue comprehensive testing unit is connected to the test cylinder 21, the force sensor 20, the displacement sensor 22, and the heating base 14, the fatigue comprehensive testing unit adjusts the heating power of the over-temperature heating base and issues an over-temperature alarm according to the heating base, and after the heating base is heated to a preset temperature, a fatigue test is performed and a displacement determination process for determining the deformation of the front fork is performed, and the shutdown action determination of the carbon fiber front fork and wheel hub disc brake fatigue testing machine is automatically performed.

[0025] The carbon fiber front fork and wheel hub disc brake fatigue tester with heating function is used to simulate the vibration state of the front fork of a bicycle. An alternating force is applied to the fixed front fork. After a certain number of times, its damage is detected. At the same time, the disc brake can be heated to a specified temperature to consider whether the composite material front fork will deteriorate significantly under the influence of brake heat. The carbon fiber front fork and wheel hub disc brake fatigue tester with heating function is suitable for horizontal fatigue test of the front fork, vertical fatigue test, Tilt angle fatigue test.

[0026] Specifically, in the present embodiment, in the cylinder test assembly, one end of the universal joint 18 is connected to the front fork hook 32 of the front fork 31, and the other end of the universal joint 18 is connected to the ball joint 19. The force sensor 20 connects the ball joint 19 to the test cylinder 21. The test cylinder 21 is fixed on the cylinder fixing bracket 23. The plunger rod fixing block of the tested cylinder 21 is connected to the displacement sensor 22. The displacement sensor 22 is used to detect the extension distance of the test cylinder 21. The force sensor 20 is used to detect the alternating force value applied by the test cylinder 21. The test cylinder 21 is connected to the air storage tank 43 through a reversing valve and a proportional valve. The cylinder fixing bracket 23 is fixed to the bottom of the upper surface of the horizontal T-slot plate 24 through a locking bolt and is connected to the cylinder transverse movement assembly.

[0027] Specifically, in this embodiment, the bottom of the cylinder fixing bracket 23 in the cylinder transverse movement assembly is fixed to the horizontal screw support seat 25, the horizontal screw is fixed to the inner side of the bottom column 28 through the horizontal bracket 26 and the horizontal screw fixing seat 27, the top of the horizontal screw fixing seat 27 is fixed to the upper horizontal fixed platform, and the fourth hand wheel 30 is fixed to the top of the horizontal screw; when the locking bolt of the cylinder fixing bracket 23 is loosened, the fourth hand wheel 30 is turned, and the cylinder fixing bracket 23 drives the test cylinder 21 to slide left and right along the groove at the sliding connection between the horizontal T-slot plate 24 and the cylinder fixing bracket 23.

[0028] Specifically, in this embodiment, the heating tube installation position 15 in the heating base 14 is connected to the heating tube, and the front fork of the disc brake is fixed to the heating base 14 through the first fixed mounting hole 16 and the second fixed mounting hole 17. A threaded K-type thermocouple is provided in the heating base 14, and the K-type thermocouple is provided in the middle position between the first fixed mounting hole 16 and the second fixed mounting hole 17. The K-type thermocouple is used to detect the real-time temperature of the heating base 14, and the heating tube is connected to the solid-state relay, and the solid-state relay is used to control the heating tube to open or close.

[0029] Front fork of hub brake / disc brake: Use single-head heating tube for heating and temperature measurement. The heating tube has high power and high speed. At room temperature, install the base behind the front fork to ensure that the base can be heated to 100 ℃ within 10 minutes.

[0030] Specifically, in this embodiment, a preset temperature and an over-temperature threshold are input into the fatigue comprehensive test unit, and the real-time temperature difference is calculated in the fatigue comprehensive test unit according to the real-time temperature of the heating base and the preset temperature, and the heating power of the heating tube is adjusted according to the comparison between the real-time temperature difference and the over-temperature threshold; when the real-time temperature difference is a negative value, the heating power of the heating tube is increased; when the real-time temperature difference is a positive value and the real-time temperature difference is greater than the over-temperature threshold, the solid-state relay is turned off, and an alarm is given on the control panel; when the real-time temperature difference is a positive value and the real-time temperature difference is less than the over-temperature threshold, the heating power of the heating tube is reduced; the adjustment process of the heating power of the heating tube adopts temperature proportional calculus adjustment.

[0031] In the embodiment, the real-time temperature of the heating base is controlled by temperature PID control, and the temperature fluctuation is controlled within ±1°C through closed-loop control of temperature proportional calculus. In terms of temperature control, the role of PID control is to adjust the output of the heating tube according to the feedback signal of the temperature sensor to maintain the set target temperature. The proportional part adjusts the output according to the deviation between the current temperature and the target temperature, the integral part adjusts the output according to the accumulation of the deviation, and the differential part adjusts the output according to the speed of the deviation change. The three work together to achieve precise control of the temperature. Over-temperature protection: During the actual test, the circuit is automatically cut off when the set temperature exceeds 10°C, and an alarm is sounded. The temperature sensor is a threaded K-type thermocouple, and the cut-off control is a computer acquisition and control circuit. When the set temperature exceeds +10°C, the computer cuts off the output and turns off the solid-state relay. The temperature sensor is installed in the middle of the two fixing holes of the disk gate on the base, and the cut-off circuit is in the electrical control box.

[0032] Specifically, in the present embodiment, the front fork fixing assembly fixes the front fork riser 10 in the front fork bearing seat 11, and the front fork riser 10 is locked on the front fork bearing seat 11 by the second hand wheel 12 and the third hand wheel 13, the vertical movable plate 4 is slidably connected to the vertical T-slot plate 9, the vertical movable plate 4 is fixed to the vertical screw in the frame column 2 by the ball screw nut seat 3 and the screw nut 6, the top of the vertical screw is connected to the frame column 2 by the first vertical screw support 8, the bottom of the vertical screw is fixed to the frame column 2 by the second vertical ball screw support 33, the bottom of the second vertical ball screw support 33 is fixed to the bevel gear shaft fixing plate, the bevel gear shaft is fixed in the bevel gear shaft fixing plate, a bevel gear is arranged at the bottom end of the vertical screw, the bevel gear is meshed with the bevel gear shaft, the bevel gear is fixed to the frame column 2 by the bearing seat 7, and the first hand wheel 5 is fixed to the top of the bevel gear shaft.

[0033] Specifically, in this embodiment, when the carbon fiber front fork and wheel hub disc brake fatigue test machine is carried out During the tilt angle fatigue test, the second angle fixing plate 35 is connected to the vertical moving plate 4, and the second angle fixing plate 35 is fixed to the short right-angle side of the first angle fixing plate 34. The T-slot 36 is fixed to the hypotenuse of the first angle fixing plate 34. The included angle between the T-slot 36 and the horizontal bottom surface of the first angle fixing plate 34 is , The T-slot 36 is connected to the front fork bearing seat 11 in the front fork fixing assembly. During the test, the angle between the front fork riser 10 and the horizontal line is .

[0034] Specifically, in this embodiment, when the front fork is subjected to a vertical test, the front fork axis of the front fork stem 10 is on the same horizontal line with the test cylinder 21, the displacement sensor 22, and the force sensor 20, and the front fork stem 10 is kept vertical with the test cylinder 21, the displacement sensor 22, and the force sensor 20; when a disc brake test is performed, the front fork axis is on the same horizontal line with the test cylinder 21, the displacement sensor 22, and the force sensor 20, and the front fork stem 10 is kept in a vertical position.

[0035] Specifically, in this embodiment, the comprehensive test unit determines the force direction of the fatigue test, the horizontal tension value, the vertical force value, the test frequency, and the initial test displacement in the test according to the test process. When the heating base is heated, the indicator light connected to the heating tube lights up. When the real-time temperature detected by the K-type thermocouple of the fatigue comprehensive test unit reaches the preset temperature, a start command is input into the comprehensive test unit, and the comprehensive test unit performs a fatigue test to control the test cylinder 21 to start extending and retracting force. During the fatigue test, an offset ratio value is preset in the comprehensive test unit. The comprehensive test unit calculates the test excess ratio value of the front fork that exceeds the initial test displacement based on the real-time detected offset of the front fork. When the test excess ratio value is greater than the preset offset ratio value, the comprehensive test unit begins to determine the displacement of the front fork deformation.

[0036] During the actual test, the detection frequency does not exceed 10Hz, and the maximum load frequency is less than or equal to 25Hz. The initial test displacement refers to the displacement of the front fork in the unloaded state before the test begins. If the offset (peak to peak value) at the test load application point exceeds 20% of its initial test displacement for a rigid front fork and 40% of the initial test displacement for a suspension front fork during the test, the displacement of the front fork deformation is judged. The load borne on the load bearing device according to the type of bicycle is shown in Table 1, in N.

[0037] Table 1 Bike type City Touring Bikes Youth Bicycles Mountain Bike Racing car Force, F6 ±450 ±450 ±650 ±620 Specifically, in this embodiment, the number of test runs is input in the comprehensive test unit. When the carbon fiber front fork and hub disc brake fatigue testing machine is tested at a preset frequency and a determined horizontal tension value and a vertical force value, the number of test runs is reduced by one each time it is completed until the number of test runs is zero or the travel switch of the test cylinder 21 detects that the travel of the test cylinder is at the maximum value. The fatigue comprehensive test unit controls the carbon fiber front fork and hub disc brake fatigue testing machine to shut down as a whole.

[0038] The carbon fiber front fork and wheel hub disc brake fatigue testing machine with heating function will automatically issue a command to indicate shutdown after reaching the set test times, and will automatically issue a command to indicate shutdown after the specimen is destroyed. That is: (1) After reaching the set value, the computer continuously updates the current number value and compares it with the set number value in real time. When the current number is greater than or equal to the set number, it stops outputting and stops counting. (2) After the specimen is destroyed, the test cylinder will be pushed to the bottom, and after the travel switch detects the signal, it will be fed back to the computer, and the computer will trigger shutdown.

[0039] Testing principle of the testing machine: After the front fork is installed and fixed, install the heating base to the fixing hole of the disc gate, enter the required temperature value in the control panel, click the start button on the control panel, the heating indicator light will light up, the equipment will start heating, after heating to the specified temperature, click the start button on the control panel to perform fatigue test, the test cylinder starts to extend and retract force, the sensor provides real-time feedback, the computer controls the reversing valve to switch back and forth, the computer adjusts the proportional valve air pressure, the whole process forms a closed-loop control until the set force value is reached, the counting is started, the machine stops when the set number of times is reached, the front fork is removed, and the entire front fork is visually inspected to see if there is any breakage.

[0040] The input content of the comprehensive test unit in the carbon fiber front fork and wheel hub brake fatigue testing machine with heating function is as follows: (1) Test type: tension, compression; (2) First control force, second control force: the test sets the control force value, the first control force is the horizontal force, and the second control force is the vertical force; (3) Number of tests: set the number of test runs; (4) Test frequency: set the machine test frequency; (5) Number of allowable errors: during the test, the peak and valley values ​​recorded by the comprehensive test unit continuously exceed the statistical accuracy range, and the machine will automatically shut down when the set number of times is reached; (6) Force drop percentage: during the test, when the change in the peak and valley values ​​decreases to the set percentage, the comprehensive test unit automatically determines the shutdown protection, that is, the shutdown logic after the above-mentioned specimen is destroyed; the statistical accuracy is set according to the standard requirements with (0 ~ +5)% of the set value as the upper and lower limits. For example, if 1000N is set, the range (1000 ~ 1050) N, range 1000 times; during operation, if the collected force value is continuously less than or greater than the set value range for 1000 times, the comprehensive test unit will stop. If the collected force value is normal for the 1000th time after 999 consecutive failures, the comprehensive test unit will reset the statistical accuracy count and continue to work; (7) Measure the displacement at the front fork shaft. After installing the front fork, the comprehensive test unit records the initial displacement and resets it. After the fatigue test is completed, the displacement is measured again. This value is the deformation of the front fork. After executing the test, the comprehensive test unit automatically adjusts the pressure value of the cylinder force through the proportional valve and the force sensor so that the error between the test display load and the set load is within the allowable range.

[0041] The carbon fiber front fork and wheel disc brake fatigue testing machine with heating function can perform fatigue tests accurately and efficiently under different test conditions to ensure the reliability of the test results and the safety of the product. The cylinder vibration control cylinder can respond to the control signal quickly to achieve fast start and stop. It is suitable for high-frequency vibration fatigue testing processes and adjusts the cylinder's motion parameters, such as frequency and amplitude, in real time to ensure precise control of test conditions.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A carbon fiber front fork and wheel hub brake fatigue testing machine with heating function, characterized in that: The invention comprises a front fork fixing assembly, which is used to fix a carbon fiber front fork and a wheel hub brake assembly, wherein the front fork fixing assembly is fixed on a vertical moving plate (4) via a second hand wheel (12) and a third hand wheel (13); a cylinder test assembly, which is used to simulate the vibration state of the front fork, wherein the lower part of the test cylinder (21) inside the cylinder is connected to the cylinder transverse movement assembly and the left side is connected to the front fork fixing assembly, and a heating base (14) is provided at the front fork fixing assembly, wherein the heating base (14) heats the wheel hub brake, the test cylinder (21) is connected to a force sensor (20) and a displacement sensor (22), and the cylinder transverse movement assembly drives the test cylinder (21) to move horizontally to the left and right via a fourth hand wheel (30); and a fixing assembly, which is used to fix other components, wherein the cylinder transverse movement assembly is fixed to a bottom column (28), the front fork fixing assembly is fixed to a frame column (2), and a machine is installed on the upper part of the bottom column (28). A frame column (2), a gas tank (43) is placed at the bottom of the bottom column (28) with four corner fixing feet (29), and a reinforcing rib (1) connects the upper horizontal fixing platform of the bottom frame column (2) to the frame column (2); a control panel (42) is used to control the carbon fiber front fork and wheel hub disc brake fatigue testing machine to perform fatigue testing, the control panel is fixed on the frame column (2) and is provided with a fatigue comprehensive testing unit, the fatigue comprehensive testing unit is connected to the test cylinder (21), the force value sensor (20), the displacement sensor (22), and the heating base (14), the fatigue comprehensive testing unit adjusts the heating power of the heating base and issues an over-temperature alarm according to the over-temperature of the heating base, and after the heating base is heated to a preset temperature, a fatigue test is performed and a displacement determination process of determining the deformation of the front fork is performed, and the shutdown action determination of the carbon fiber front fork and wheel hub disc brake fatigue testing machine is automatically performed.

2. The carbon fiber front fork and hub disc brake fatigue testing machine with heating function according to claim 1 is characterized in that: In the cylinder test assembly, one end of the universal joint (18) is connected to the front fork hook (32) of the front fork (31), and the other end of the universal joint (18) is connected to the ball joint (19). The force sensor (20) connects the ball joint (19) to the test cylinder (21). The test cylinder (21) is fixed on the cylinder fixing bracket (23). The test cylinder (21) is connected to the displacement sensor (22). The displacement sensor (22) is used to detect the displacement of the test front fork. The force sensor (20) is used to detect the alternating force value applied by the test cylinder (21). The test cylinder (21) is connected to the air storage tank (43) through a reversing valve and a proportional valve. The cylinder fixing bracket (23) is fixed to the bottom of the upper surface of the horizontal T-shaped slot plate (24) through a locking bolt and is connected to the cylinder transverse displacement assembly. The test cylinder (21) is connected to a travel switch.

3. The carbon fiber front fork and wheel hub disc brake fatigue testing machine with heating function according to claim 2, characterized in that: The bottom of the cylinder fixing bracket (23) in the cylinder transverse movement assembly is fixed to the horizontal screw support seat (25), the horizontal screw is fixed to the inner side of the bottom column (28) through the horizontal bracket (26) and the horizontal screw fixing seat (27), the top of the horizontal screw fixing seat (27) is fixed to the upper horizontal fixing platform, and the fourth hand wheel (30) is fixed to the top of the horizontal screw; when the locking bolt of the cylinder fixing bracket (23) is loosened, the fourth hand wheel (30) is rotated, and the cylinder fixing bracket (23) drives the test cylinder (21) to slide left and right along the groove at the sliding connection between the horizontal T-shaped slot plate (24) and the cylinder fixing bracket (23).

4. The carbon fiber front fork and wheel hub disc brake fatigue testing machine with heating function according to claim 1, characterized in that: A heating tube is connected to a heating tube installation location (15) in the heating base (14); the disc brake front fork is fixed to the heating base (14) through a first fixed installation hole (16) and a second fixed installation hole (17); a threaded K-type thermocouple is provided in the heating base (14); the K-type thermocouple is provided at a middle position between the first fixed installation hole (16) and the second fixed installation hole (17); the K-type thermocouple is used to detect the real-time temperature of the heating base (14); the heating tube is connected to a solid-state relay; the solid-state relay is used to control the heating tube to be opened or closed.

5. The carbon fiber front fork and wheel hub disc brake fatigue testing machine with heating function according to claim 4, characterized in that: A preset temperature and an over-temperature threshold are input into a fatigue comprehensive test unit, and a real-time temperature difference is calculated in the fatigue comprehensive test unit according to the real-time temperature of the heating base and the preset temperature, and the heating power of the heating tube is adjusted according to the comparison between the real-time temperature difference and the over-temperature threshold; when the real-time temperature difference is a negative value, the heating power of the heating tube is increased; when the real-time temperature difference is a positive value and the real-time temperature difference is greater than the over-temperature threshold, the solid-state relay is turned off, and an alarm is given on the control panel; when the real-time temperature difference is a positive value and the real-time temperature difference is less than the over-temperature threshold, the heating power of the heating tube is reduced; the adjustment process of the heating power of the heating tube adopts temperature proportional calculus adjustment.

6. The carbon fiber front fork and hub disc brake fatigue testing machine with heating function according to claim 1, characterized in that: In the front fork fixing assembly, the front fork riser (10) is fixed in the front fork bearing seat (11), and the front fork riser (10) is locked on the front fork bearing seat (11) by means of a second hand wheel (12) and a third hand wheel (13). The vertical moving plate (4) is slidably connected to the vertical T-shaped slot plate (9). The vertical moving plate (4) is fixed to the vertical screw in the frame column (2) by means of a ball screw nut seat (3) and a screw nut (6). The top of the vertical screw is fixed by means of a first vertical screw support. The seat (8) is connected to the frame column (2), the bottom of the vertical screw is fixed to the frame column (2) through a second vertical ball screw support (33), the bottom of the second vertical ball screw support (33) is fixed with a bevel gear shaft fixing plate, the bevel gear shaft is fixed inside the bevel gear shaft fixing plate, a bevel gear is arranged at the bottom end of the vertical screw, the bevel gear is meshed with the bevel gear shaft, the bevel gear shaft is fixed to the frame column (2) through a bearing seat (7), and a first hand wheel (5) is fixed to the top end of the bevel gear shaft.

7. The carbon fiber front fork and wheel hub disc brake fatigue testing machine with heating function according to claim 6, characterized in that: When the carbon fiber front fork and wheel hub disc brake fatigue testing machine is carried out During the tilt angle fatigue test, the second angle fixing plate (35) is connected to the vertical movable plate (4), and the second angle fixing plate (35) is fixed to the short right-angle side of the first angle fixing plate (34). The T-slot (36) is fixed to the oblique side of the first angle fixing plate (34), The included angle between the T-shaped slot (36) and the horizontal bottom surface of the first angle fixing plate (34) is , The T-slot (36) is connected to the front fork bearing seat (11) in the front fork fixing assembly. During the test, the angle between the front fork riser (10) and the horizontal line is .

8. The carbon fiber front fork and hub disc brake fatigue testing machine with heating function according to claim 1, characterized in that: When the front fork is subjected to a vertical test, the front fork axis of the front fork riser (10) is on the same horizontal line as the test cylinder (21), the displacement sensor (22), and the force sensor (20), and the front fork riser (10) is kept vertically aligned with the test cylinder (21), the displacement sensor (22), and the force sensor (20); when a disc brake test is conducted, the front fork axis is on the same horizontal line as the test cylinder (21), the displacement sensor (22), and the force sensor (20), and the front fork riser (10) is kept vertically aligned.

9. The carbon fiber front fork and wheel hub disc brake fatigue testing machine with heating function according to claim 5, characterized in that: The force direction of the fatigue test, the horizontal tensile force value, the vertical force value, the test frequency, and the initial test displacement are determined in the comprehensive test unit according to the test process. When the heating base is heated, the indicator light connected to the heating tube is lit. When the real-time temperature detected by the K-type thermocouple of the fatigue comprehensive test unit reaches the preset temperature, a start command is input in the comprehensive test unit, and the comprehensive test unit performs the fatigue test to control the test cylinder (21) to start extending and retracting the force. During the fatigue test, an offset ratio value is preset in the comprehensive test unit. The comprehensive test unit calculates the test excess ratio value of the front fork that exceeds the initial test displacement based on the offset of the front fork detected in real time. When the test excess ratio value is greater than the preset offset ratio value, the comprehensive test unit begins to determine the displacement of the front fork deformation.

10. The carbon fiber front fork and wheel hub disc brake fatigue testing machine with heating function according to claim 1, characterized in that: The number of test runs is input into the comprehensive test unit. When the carbon fiber front fork and wheel hub disc brake fatigue tester performs a test at a preset frequency and a determined horizontal tension value and vertical force value, the number of test runs is reduced once each time a test is completed until the number of test runs is zero or the travel switch of the test cylinder (21) detects that the travel of the test cylinder is at a maximum value. Then, the fatigue comprehensive test unit controls the carbon fiber front fork and wheel hub disc brake fatigue tester to stop as a whole.

Images