Composite steel belt friction wear test device and test method

Abstract

The invention relates to the technical field of friction and wear of traction composite steel belts for elevators, in particular to a friction and wear test device and method for a composite steel belt, and the friction and wear test device comprises an integral support, a floating loading support, a central transmission device, a worm and gear transmission device and a steel belt fixing device. Guide rails are fixed on the inner sides of the upright posts of the integral bracket and the upper side of the underframe; the floating loading bracket is fixed with the slide blocks so as to longitudinally move on the upright post guide rails; the central transmission device is provided with a stepping motor, a traction wheel, a transmission shaft and a bearing seat, and the transmission shaft is connected with a motor shaft through a coupler; the worm and gear transmission device is located at the lower end of the center transmission device and is in matched transmission with a spiral seat fixed to the lower end of the overall support through a spiral rod, so that stand columns on the two sides of the overall support move transversely, and adjustment of different wrap angles of the steel belt is achieved. The steel belt is fixed through a steel belt clamping plate and is connected with a tension sensor, and the tension sensor is fixed on transverse mounting plates on two sides of the floating loading bracket through hook screws.

Description

Technical Field

[0001] The invention relates to the technical field of friction and wear of composite traction steel belts for elevators, and in particular to a composite steel belt friction and wear test device and a test method. Background Art

[0002] The traction composite steel belt, which uses thermoplastic polyurethane as the coating material, is a new type of transmission medium and plays an important role in load-bearing and transmission in the elevator traction system. Its friction and wear performance is affected by a variety of operating factors, such as load, running speed, running distance, temperature changes, and aging of the steel belt, which will aggravate the wear on the surface of the steel belt and cause its service performance to deteriorate. Changes in friction and wear performance may not only lead to increased wear of the steel belt, but also increase noise and vibration during elevator operation, and even reach the scrap condition ahead of time; in severe cases, it may also cause elevator transmission failure or steel belt breakage, thus bringing potential safety hazards.

[0003] At present, the research on the friction and wear performance of traction composite steel belts mainly focuses on the test of friction coefficient. Invention patent ZL201810603725.8 proposed a test device and test method for the equivalent friction coefficient of composite steel belts; Hrabovsky (Material Science and Engineering, 2021) introduced the equipment and friction coefficient measurement method for determining the friction coefficient of elevator steel belts through experiments. Fang Xiangyu (China Elevator, 2022) introduced a method for measuring the friction coefficient of traction steel belts in the whole elevator state, including the use of special tooling to measure dynamic friction and static friction, and explored the measurement methods of different media such as fine sand, water medium, and oil medium.

[0004] The above-mentioned papers and patents mainly focus on the friction coefficient test device and test method of the composite steel belt, but are unable to test the friction and wear performance of the composite steel belt under multiple working conditions, making it difficult to effectively evaluate the health status of the traction steel belt under service. Summary of the invention

[0005] The purpose of the present invention is to provide a composite steel belt friction and wear testing device and test method, which has the advantage of being able to comprehensively analyze the friction behavior of the steel belt under different working conditions, and solves the problem that the current steel belt friction and wear device is unable to test the friction and wear performance of the composite steel belt under multiple working conditions, and it is difficult to effectively evaluate the health status of the traction steel belt under service.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a steel belt friction and wear device, comprising an integral bracket, a floating loading bracket, a central transmission device, a worm gear transmission device, and a steel belt fixing device.

[0007] Furthermore, as a preferred embodiment of the present invention, the integral bracket includes a profile vertical bar, a vertical guide rail, a vertical slider, a horizontal slider, a horizontal guide rail, a base frame, a profile reinforcement rib, a cross bar, and a bottom plate. One side of the profile vertical bar is fixedly connected to the vertical guide rail, and the two vertical sliders are slidably connected to the surface of the vertical guide rail. The cross bar is fixedly connected to the opposite side of the two profile vertical bars, and the profile vertical bar and the bottom of the vertical guide rail are jointly fixedly connected to the bottom plate, the profile reinforcement rib is fixedly connected to one side of the profile vertical bar, and the other end of the profile reinforcement rib is fixedly connected to the bottom plate, the bottoms of both sides of the bottom plate are fixedly connected to the two horizontal sliders, the top of the base frame is fixedly connected to the horizontal guide rail, and the horizontal slider is slidably connected to the surface of the horizontal guide rail.

[0008] Further, as a preferred embodiment of the present invention, the floating loading bracket includes a slider connecting plate, a slider, a guide rail, a load-bearing plate, a transverse mounting plate, and a rectangular frame. The guide rail is fixedly connected to both sides of the bottom of the load-bearing plate, the surface of the guide rail is slidably connected to the slider, the bottom of the slider is fixedly connected to the slider connecting plate, the bottom of the slider connecting plate is fixedly connected to the rectangular frame, the transverse mounting plate is fixedly connected to a common side of the two rectangular frames, and both ends of the transverse mounting plate are fixedly connected to the vertical slider.

[0009] Further, as a preferred embodiment of the present invention, the steel belt fixing device includes a steel belt, a steel belt clamp, bolts and nuts, a rope end adapter, a fixing nut, a tension sensor, and a hook screw. One end of the steel belt passes through the steel belt clamp to bypass the pulley in the rope end adapter, and the steel belt is wound back through the steel belt clamp and fixed in the steel belt clamp by the bolts and nuts. One end of the tension sensor is fixedly connected to the rope end adapter through the fixing nut, and the other end of the tension sensor is fixedly connected to the hook screw, and the hook screw is fixedly connected to the floating loading bracket.

[0010] Further, as a preferred embodiment of the present invention, the central transmission device includes a stepper motor, a first motor fixing plate, a coupling, a transmission shaft, a traction wheel, a bearing and a bearing seat, a support base, the traction wheel and the center position of the stepper motor shaft are fixed, one end of the stepper motor is fixedly connected to the first motor fixing plate, the output shaft of the stepper motor passes through the first motor fixing plate and is fixedly connected to the coupling, the coupling is fixedly connected to one end of the transmission shaft, the surface of the transmission shaft is fixedly connected to the traction wheel, and the two ends of the transmission shaft are rotatably connected together in the inner cavity of the bearing and the bearing seat, and the bottom of the bearing and the bearing seat is fixedly connected to the support base.

[0011] Further, as a preferred embodiment of the present invention, the worm gear transmission device includes a motor, a turbine, a worm, a screw rod, a screw seat, a bearing seat, and a second motor fixing plate, one side of the motor is fixedly connected to the surface of the second motor fixing plate, the output end of the motor passes through the second motor fixing plate and is fixedly connected to the worm, both ends of the worm are rotatably connected to the bearing seat, the bearing seat is fixedly connected to the surface of the base frame, the worm and the turbine are meshed with each other, the turbine is fixedly connected to the screw rod, and the screw seat is slidably connected to the surface of the screw rod.

[0012] In the present invention, a method for using a composite steel strip friction and wear testing device comprises the following steps:

[0013] Step 1: The vertical guide rail is fixed on the vertical rod, the vertical rod is connected and fixed to the horizontal rod, one end of the profile reinforcement rib is fixed on the vertical rod and the other end is fixed to the bottom plate together with the end of the vertical rod to form a triangular reinforcement rib, the bottom plate is fixed to the horizontal slider, the horizontal slider slides in coordination with the horizontal guide rail fixed on the base frame, and the columns on both sides of the integral bracket are moved in the direction of the horizontal guide rail through the horizontal slider.

[0014] Step 2: The guide rails are fixed on both sides of the load-bearing plate, one end of the slider connecting plate is fixed to the rectangular frame and the other end is fixed to the slider, the slider slides in cooperation with the guide rails, the middle part of the transverse mounting plate is fixed on the rectangular frame, and both ends of the transverse mounting plate are fixed on the vertical sliders, so that the floating loading bracket moves in the vertical direction and the rectangular frame moves along the direction of the load-bearing plate guide rails.

[0015] Step three: one end of the steel belt passes through the pulley in the rope end adapter through the steel belt clamp, and is rewound through the steel belt clamp and fixed in the steel belt clamp by bolts and nuts. One end of the tension sensor is fixed to the rope end adapter through a fixing nut and the other end is fixedly connected to the lifting eye screw. The hook screw is connected and fixed to the horizontal mounting plate with a lifting eye at the lower end of the floating loading bracket. The lower end of the steel belt contacts the traction wheel, and the other end of the steel belt is fixed in the steel belt clamp on the other side according to the above method.

[0016] Step 4: The motor shaft is fixed to one end of the transmission shaft through a coupling, the traction wheel is fixed on the transmission shaft, and the two ends of the transmission shaft and the bearing seats fixed on the support base cooperate with the stepper motor to rotate and drive the traction wheel to rotate.

[0017] Step 5: The worm shaft is matched with the motor shaft hole, and the two ends of the worm are fixed by the bearing seat fixed to the bottom frame of the integral bracket. The turbine is located on the spiral rod and meshes with the worm. The two ends of the spiral rod mesh with the spiral seat fixed on the bottom plate of the integral bracket. The middle part of the spiral rod is fixedly supported by the bearing seat fixed on the connecting crossbar of the bottom frame of the integral bracket. The motor drives the worm to rotate, and the worm drives the turbine and the spiral rod to rotate, thereby driving the spiral seat to move along the direction of the spiral rod. Specifically, the two worms and the turbine are left-handed and right-handed respectively, and the spiral seats at both ends are left-handed and right-handed, respectively, so that the spiral seats at both ends can move inward and outward at the same time.

[0018] A composite steel strip friction and wear test method, the method comprising the following steps:

[0019] S1: Installation of the steel belt sample: one end of the steel belt passes through the inside of the steel belt clamp plate and around the pulley in the rope end adapter, then rewinds through the inside of the steel belt clamp plate and is fixed in the steel belt clamp plate by bolts and nuts. One end of the tension sensor is fixed to the rope end adapter by a fixing nut and the other end is fixedly connected to the hook screw. The hook screw is connected and fixed to the horizontal mounting plate with a lifting ring at the lower end of the floating loading bracket. The lower end of the steel belt contacts the traction wheel, and the other end of the steel belt is fixed in the steel belt clamp plate on the other side according to the above method.

[0020] S2: Friction and wear at different speeds: The motor of the central transmission device uses a stepper motor. By changing the frequency of the stepper motor, the elevator speed is changed to meet the requirements of the steel belt friction and wear test at different speeds;

[0021] S3: Friction and wear at different sliding distances: When conducting the friction and wear test of the steel belt at different sliding distances, the sliding distance is converted into the number of revolutions of the traction wheel, and further, the number of revolutions of the traction wheel is controlled by sending the number of pulse signals corresponding to different numbers of revolutions to the stepping motor;

[0022] According to the formula, Calculate the required number of pulses;

[0023] Wherein, L represents the sliding distance; D represents the diameter of the traction wheel; θ represents the step angle of the stepping motor;

[0024] S4: Friction and wear under different wrap angles: The motor of the worm gear transmission device rotates to drive the worm, and the turbine on the spiral rod meshes with the worm for transmission. The spiral rod cooperates with the spiral seat fixed on the bottom plate of the integral bracket for transmission. The two worms and the turbine are left-handed and right-handed respectively. At the same time, the spiral seats at both ends are left-handed and right-handed respectively, so that the spiral seats at both ends move inward and outward at the same time, driving the left and right side columns of the integral bracket to move in the horizontal direction, thereby changing the wrap angle of the steel belt. Through the formula Get the wrap angle of the steel strip;

[0025] Among them, b represents the vertical distance from the highest point of the traction wheel to the fixed end of the steel belt; a represents the distance from the fixed end of the steel belt to the center line of the traction wheel; r is the radius of the traction wheel;

[0026] S5: Friction and wear under different loads: The contact loads at both ends of the steel belt are changed by replacing the weights on the floating loading bracket;

[0027] S6: Friction and wear test under aging state: First, high temperature and humidity aging is carried out. The steel strip test is carried out at a temperature of 70℃±2℃ and a relative humidity of not less than 90%, and the test time is 168h; after high temperature and humidity aging, a low temperature aging test is carried out at a temperature of -10℃±2℃, and the test time is 96h; after wet temperature aging, wait for the steel strip sample to return to room temperature of 10℃~35℃, and then carry out the test steps of S1, S2, S3, S4, and S5;

[0028] S7: Collection of test data:

[0029] a. Use the tension sensor to collect and record the tension at both ends of the steel belt;

[0030] b. Use a thermal imager to collect and record the surface temperature of the steel strip in the test;

[0031] c. Use an electron scanning microscope to collect and record the surface morphology of the steel strip after the test;

[0032] d. Use a precision balance to collect and record the weight of the steel strip before and after the test;

[0033] e. Recording of friction coefficient: The floating loading bracket provides a load for the steel belt. Driven by the stepper motor, the traction wheel and the steel belt achieve sliding friction wear. The steel belt clamp is connected to the tension sensor to measure the tension on both sides of the steel belt, and the friction coefficient is obtained by the formula:

[0034] Among them, T 1 , T 2 , The tension on both sides of the steel belt, and assuming T 1 >T 2 ;

[0035] e represents the base of the natural pair, e = 2.718282;

[0036] f represents the equivalent friction coefficient; α represents the wrap angle between the steel belt and the traction wheel;

[0037] S8: Evaluation of friction and wear degree of steel strip specimens: The friction and wear degree of the specimens is mainly determined by relative comparison of the weight or wear volume and surface morphology of the specimens before and after the test;

[0038] 1. Use a precision balance to measure the weight of the steel strip sample before and after the test, according to the formula Determine the wear rate;

[0039] Where K represents the wear rate;

[0040] V represents the wear volume (mm 3 );

[0041] F represents applied load (N);

[0042] D represents the total sliding stroke (μm);

[0043] 2. Use a scanning electron microscope to observe the surface of the steel strip sample after the test and analyze the surface morphology and wear mechanism after friction and wear;

[0044] S9: Tensile breaking test: The steel strip sample after steps S1, S2, S3, S4, S5, S6, S7, and S8 is subjected to a tensile breaking test on a tensile breaking tester to obtain the tensile strength of the steel strip after the friction and wear test.

[0045] Beneficial effects. The technical solution of the present application has the following technical effects: the present invention accumulates friction and wear performance data under different working environments by conducting friction and wear tests on composite steel belts under various working conditions. These data not only provide an important basis for in-depth discussion of the friction and wear mechanism of the traction steel belt, but also provide scientific data support for accurately predicting its service life. Through a comprehensive analysis of the friction behavior of the steel belt under different working conditions, it is helpful to optimize the material selection and use conditions of the traction steel belt, further improve its performance and durability, thereby providing technical guarantee for the reliability and safety of the traction system.

[0046] It should be appreciated that all combinations of the foregoing concepts, as well as additional concepts described in greater detail below, may be considered to be part of the inventive subject matter of the present disclosure, provided such concepts are not mutually inconsistent. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0048] Figure 1 It is a structural schematic diagram of the present invention;

[0049] Figure 2 is a schematic diagram of the overall support of the present invention;

[0050] Figure 3 is a schematic diagram of a floating loading support of the present invention;

[0051] Figure 4 is a schematic diagram of a steel belt fixing device of the present invention;

[0052] Figure 5 is a schematic diagram of a central transmission device of the present invention;

[0053] Figure 6 is a schematic diagram of a worm gear transmission device of the present invention;

[0054] Figure 7 It is a schematic diagram of calculating the steel strip wrap angle of the present invention.

[0055] In the figure, the meanings of the reference numerals are as follows: 10, integral bracket; 11, profile vertical rod; 12, vertical guide rail; 13, vertical slider; 14, horizontal slider; 15, horizontal guide rail; 16, bottom frame; 17, profile reinforcement rib; 18, cross bar; 19, bottom plate; 20, floating loading bracket; 21, slider connecting plate; 22, slider; 23, guide rail; 24, load-bearing plate; 25, horizontal mounting plate; 26, rectangular frame; 30, steel belt fixing device; 31, steel belt; 32, steel belt clamping plate; 33, Bolts and nuts; 34. Rope end adapter; 35. Fixing nut; 36. Tension sensor; 37. Hook screw; 40. Central transmission device; 41. Stepper motor; 42. First motor fixing plate; 43. Coupling; 44. Transmission shaft; 45. Traction wheel; 46. Bearing and bearing seat; 47. Support base; 50. Worm gear transmission device; 51. Motor; 52. Turbine; 53. Worm; 54. Screw rod; 55. Screw seat; 56. Bearing seat; 57. Second motor fixing plate. DETAILED DESCRIPTION

[0056] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. In order to better understand the technical content of the present invention, specific embodiments are cited and explained in conjunction with the drawings as follows. Various aspects of the present invention are described in this disclosure with reference to the drawings, in which many illustrative embodiments are shown. It should be understood that the various concepts and embodiments introduced above, as well as those described in more detail below, can be implemented in any of many ways. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0057] As attached Figure 1 To Attachment Figure 7 As shown: This embodiment provides a steel belt friction and wear device, such as Figure 1 As shown, it includes an integral support 10 , a floating loading support 20 , a steel belt fixing device 30 , a central transmission device 40 and a worm gear transmission device 50 .

[0058] Specifically, Figure 2 As shown, the integral bracket 10 includes a profile vertical rod 11, a vertical guide rail 12, a vertical slider 13, a horizontal slider 14, a horizontal guide rail 15, a base frame 16, a profile reinforcing rib 17, a cross bar 18, and a bottom plate 19. One side of the profile vertical rod 11 is fixedly connected to the vertical guide rail 12, two vertical sliders 13 are slidably connected to the surface of the vertical guide rail 12, the cross bar 18 is fixedly connected to the opposite side of the two profile vertical rods 11, and the bottom of the profile vertical rod 11 and the vertical guide rail 12 are jointly fixedly connected to the bottom plate 19, the profile reinforcing rib 17 is fixedly connected to one side of the profile vertical rod 11, and the other end of the profile reinforcing rib 17 is fixedly connected to the bottom plate 19, the bottoms of both sides of the bottom plate 19 are fixedly connected to the two horizontal sliders 14, the top of the base frame 16 is fixedly connected to the horizontal guide rail 15, and the horizontal slider 14 is slidably connected to the surface of the horizontal guide rail 15.

[0059] In this embodiment: the vertical guide rail 12 is fixed to the vertical rod 11, the vertical rod 11 is connected and fixed to the cross rod 18, one end of the profile reinforcement rib 17 is fixed to the vertical rod 11 and the other end is fixed together with the end of the vertical rod to the bottom plate 19 to form a triangular reinforcement rib, the bottom plate 19 is fixed to the horizontal slider 14, the horizontal slider 14 slides in cooperation with the horizontal guide rail 15 fixed to the base frame 16, and the columns on both sides of the integral bracket 10 are moved in the direction of the horizontal guide rail 15 through the horizontal slider 14.

[0060] Specifically, Figure 3 As shown, the floating loading bracket 20 includes a slider connecting plate 21, a slider 22, a guide rail 23, a load-bearing plate 24, a transverse mounting plate 25, and a rectangular frame 26. The guide rail 23 is fixedly connected to both sides of the bottom of the load-bearing plate 24, the surface of the guide rail 23 is slidably connected to the slider 22, the bottom of the slider 22 is fixedly connected to the slider connecting plate 21, the bottom of the slider connecting plate 21 is fixedly connected to the rectangular frame 26, the transverse mounting plate 25 is fixedly connected to a common side of the two rectangular frames 26, and both ends of the transverse mounting plate 25 are fixedly connected to the vertical slider 13.

[0061] In this embodiment: the guide rail 23 is fixed to both sides of the load-bearing plate 24, one end of the slider connecting plate 21 is fixed to the rectangular frame 26 and the other end is fixed to the slider 22, the slider 22 slides in cooperation with the guide rail 23, the middle part of the transverse mounting plate 25 is fixed on the rectangular frame 26, and the two ends of the transverse mounting plate 25 are fixed on the vertical slider 13, so that the floating loading bracket 20 moves in the vertical direction and the rectangular frame moves along the direction of the load-bearing plate guide rail.

[0062] Specifically, Figure 4As shown, the steel belt fixing device 30 includes a steel belt 31, a steel belt clamp plate 32, bolts and nuts 33, a rope end adapter 34, a fixing nut 35, a tension sensor 36, and a hook screw 37. One end of the steel belt 31 passes through the steel belt clamp plate 32 to pass around the pulley in the rope end adapter 34, and is wound back through the steel belt clamp plate 32 and fixed in the steel belt clamp plate 32 by the bolts and nuts 33. One end of the tension sensor 36 is fixedly connected to the rope end adapter 34 through the fixing nut 35, and the other end of the tension sensor 36 is fixedly connected to the hook screw 37, and the hook screw 37 is fixedly connected to the floating loading bracket 20.

[0063] In this embodiment: one end of the steel belt 31 passes through the steel belt clamp 32 to bypass the pulley in the rope end adapter 34, rewinds through the steel belt clamp 32 and is fixed in the steel belt clamp by bolts and nuts 33, one end of the tension sensor 36 is fixed to the rope end adapter 34 by a fixing nut 35 and the other end is fixedly connected to the eye screw, the hook screw 37 is connected and fixed to the horizontal mounting plate with a eye at the lower end of the floating loading bracket 20, the lower end of the steel belt contacts the traction wheel, and the other end of the steel belt is fixed in the steel belt clamp on the other side according to the above method.

[0064] Specifically, Figure 5 As shown, the central transmission device 40 includes a stepper motor 41, a first motor fixing plate 42, a coupling 43, a transmission shaft 44, a traction wheel 45, a bearing and a bearing seat 46, a support base 47, the traction wheel 45 and the center position of the stepper motor 41 axis are fixed, one end of the stepper motor 41 is fixedly connected to the first motor fixing plate 42, the output shaft of the stepper motor 41 passes through the first motor fixing plate 42 and is fixedly connected to the coupling 43, the coupling 43 is fixedly connected to one end of the transmission shaft 44, the surface of the transmission shaft 44 is fixedly connected to the traction wheel 45, and the two ends of the transmission shaft 44 are rotatably connected together in the inner cavity of the bearing and the bearing seat 46, and the bottom of the bearing and the bearing seat 46 is fixedly connected to the support base 47.

[0065] In this embodiment: the motor shaft is fixed to one end of the transmission shaft 44 through a coupling 43, the traction wheel 45 is fixed on the transmission shaft 44, and the two ends of the transmission shaft 44 cooperate with the bearing seats 46 fixed on the support base 47 to rotate with the stepping motor 41 to drive the traction wheel 45 to rotate.

[0066] Specifically, Figure 6As shown, the worm gear transmission device includes a motor 51, a turbine 52, a worm 53, a screw rod 54, a screw seat 55, a bearing seat 56, and a second motor fixing plate 57. One side of the motor 51 is fixedly connected to the surface of the second motor fixing plate 57, the output end of the motor 51 passes through the second motor fixing plate 57 and is fixedly connected to the worm 53, both ends of the worm 53 are rotatably connected to the bearing seat 56, the bearing seat 56 is fixedly connected to the surface of the base frame 16, the worm 53 and the turbine 52 are meshed with each other, the turbine 52 is fixedly connected to the screw rod 54, and the screw seat 55 is slidably connected to the surface of the screw rod 54.

[0067] In this embodiment: the worm shaft 53 cooperates with the hole of the motor shaft 51, and the two ends of the worm 53 are fixed by bearing seats 56 fixed to the overall bracket base frame. The turbine 52 is located on the spiral rod 54 and meshes with the worm 53 for transmission. The two ends of the spiral rod 54 mesh with the spiral seats 55 fixed on the overall bracket base plate 19. The middle part of the spiral rod 54 is fixedly supported by the bearing seats 56 fixed on the connecting cross bar 16 of the overall bracket base frame. The motor 51 drives the worm 53 to rotate, and the worm 53 drives the turbine 52 and the spiral rod 54 to rotate, thereby driving the spiral seat 55 to move along the direction of the spiral rod 54. Specifically, the two worms 53 and the turbine 52 are left-handed and right-handed respectively, and at the same time, the spiral seats 55 at both ends are left-handed and right-handed, respectively, so that the spiral seats 55 at both ends can move inward and outward at the same time.

[0068] A composite steel strip friction and wear test method, the method comprising the following steps:

[0069] S1: Installation of the steel belt sample: One end of the steel belt passes through the pulley in the rope end adapter through the steel belt clamp, and then goes back through the steel belt clamp and is fixed in the steel belt clamp by bolts and nuts. One end of the tension sensor is fixed to the rope end adapter through a fixing nut and the other end is fixed to the hook screw. The hook screw is connected and fixed to the horizontal mounting plate with a lifting ring at the lower end of the floating loading bracket. The lower end of the steel belt contacts the traction wheel, and the other end of the steel belt is fixed in the steel belt clamp on the other side according to the above method.

[0070] S2: Friction and wear at different speeds: The motor of the central transmission device uses a stepper motor. By changing the frequency of the stepper motor, the elevator speed is changed to meet the requirements of the steel belt friction and wear test at different speeds;

[0071] S3: Friction and wear at different sliding distances: When conducting the friction and wear test of the steel belt at different sliding distances, the sliding distance is converted into the number of revolutions of the traction wheel. Furthermore, the number of revolutions of the traction wheel is controlled by sending the number of pulse signals corresponding to different numbers of revolutions to the stepping motor;

[0072] According to the formula, Calculate the required number of pulses;

[0073] Where, L represents the sliding distance; D represents the diameter of the traction wheel; θ represents the step angle of the stepper motor;

[0074] S4: Friction and wear under different wrap angles: The motor of the worm gear transmission device rotates to drive the worm, and the turbine on the spiral rod meshes with the worm for transmission. The spiral rod cooperates with the spiral seat fixed on the bottom plate of the integral bracket for transmission. The two worms and the turbine are left-handed and right-handed respectively. At the same time, the spiral seats at both ends are left-handed and right-handed, respectively, so that the spiral seats at both ends move inward and outward at the same time, driving the left and right side columns of the integral bracket to move in the horizontal direction, thereby changing the wrap angle of the steel belt. Through the formula Get the wrap angle of the steel strip;

[0075] Among them, b represents the vertical distance from the highest point of the traction wheel to the fixed end of the steel belt; a represents the distance from the fixed end of the steel belt to the center line of the traction wheel; r is the radius of the traction wheel;

[0076] S5: Friction and wear under different loads: The contact load at both ends of the steel belt is changed by replacing the weights on the floating loading bracket;

[0077] S6: Friction and wear test under aging state: First, high temperature and humidity aging is carried out. The steel strip test is carried out at a temperature of 70℃±2℃ and a relative humidity of not less than 90%, and the test time is 168h; after high temperature and humidity aging, a low temperature aging test is carried out at a temperature of -10℃±2℃, and the test time is 96h; after wet temperature aging, wait for the steel strip sample to return to room temperature of 10℃~35℃, and then carry out the test steps of S1, S2, S3, S4, and S5;

[0078] S7: Collection of test data:

[0079] a. Use the tension sensor to collect and record the tension at both ends of the steel belt;

[0080] b. Use a thermal imager to collect and record the surface temperature of the steel strip in the test;

[0081] c. Use an electron scanning microscope to collect and record the surface morphology of the steel strip after the test;

[0082] d. Use a precision balance to collect and record the weight of the steel strip before and after the test;

[0083] e. Recording of friction coefficient: The floating loading bracket provides load for the steel belt. Driven by the stepper motor, the traction wheel and the steel belt realize sliding friction wear. The steel belt clamp is connected to the tension sensor to measure the tension on both sides of the steel belt. The friction coefficient is obtained by the formula:

[0084] Among them, T 1 , T 2 , The tension on both sides of the steel belt is assumed to be 1 >T 2 ;

[0085] e represents the base of the natural pair, e = 2.718282;

[0086] f represents the equivalent friction coefficient; α represents the wrap angle between the steel belt and the traction wheel;

[0087] S8: Evaluation of friction and wear degree of steel strip specimens: The friction and wear degree of the specimens is mainly determined by relative comparison of the weight or wear volume and surface morphology of the specimens before and after the test;

[0088] 1. Use a precision balance to measure the weight of the steel strip sample before and after the test, according to the formula Determine the wear rate;

[0089] Where K represents the wear rate;

[0090] V represents the wear volume (mm 3 );

[0091] F represents applied load (N);

[0092] D represents the total sliding stroke (μm);

[0093] 2. Use a scanning electron microscope to observe the surface of the steel strip sample after the test and analyze the surface morphology and wear mechanism after friction and wear;

[0094] S9: Tensile breaking test: The steel strip sample after steps S1, S2, S3, S4, S5, S6, S7, and S8 is subjected to a tensile breaking test on a tensile breaking tester to obtain the tensile strength of the steel strip after the friction and wear test.

[0095] It should be noted that, in this document, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0096] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. A composite steel belt friction and wear test device, characterized in that: The invention comprises an integral support (10), a floating loading support (20), a steel belt fixing device (30), a central transmission device (40) and a worm gear transmission device (50).

2. A composite steel strip friction and wear testing device according to claim 1, characterized in that: The integral bracket (10) comprises a profile vertical rod (11), a vertical guide rail (12), a vertical slider (13), a horizontal slider (14), a horizontal guide rail (15), a bottom frame (16), a profile reinforcing rib (17), a cross bar (18), and a bottom plate (19); one side of the profile vertical rod (11) is fixedly connected to the vertical guide rail (12); two vertical sliders (13) are slidably connected to the surface of the vertical guide rail (12); the cross bar (18) is fixedly connected to the opposite side of the two profile vertical rods (11); and The bottom of the profile vertical rod (11) and the vertical guide rail (12) are fixedly connected to the bottom plate (19); the profile reinforcing rib (17) is fixedly connected to one side of the profile vertical rod (11), and the other end of the profile reinforcing rib (17) is fixedly connected to the bottom plate (19); the bottoms of both sides of the bottom plate (19) are fixedly connected to two horizontal sliders (14); the top of the base frame (16) is fixedly connected to the horizontal guide rail (15), and the horizontal slider (14) is slidably connected to the surface of the horizontal guide rail (15).

3. The composite steel strip friction and wear testing device according to claim 1, characterized in that: The floating loading bracket (20) comprises a slider connecting plate (21), a slider (22), a guide rail (23), a load-bearing plate (24), a transverse mounting plate (25), and a rectangular frame (26); the guide rail (23) is fixedly connected to both sides of the bottom of the load-bearing plate (24); the surface of the guide rail (23) is slidably connected to the slider (22); the bottom of the slider (22) is fixedly connected to the slider connecting plate (21); the bottom of the slider connecting plate (21) is fixedly connected to the rectangular frame (26); the transverse mounting plate (25) is fixedly connected to a common side of the two rectangular frames (26); and both ends of the transverse mounting plate (25) are fixedly connected to the vertical slider (13).

4. A composite steel strip friction and wear testing device according to claim 1, characterized in that: The steel belt fixing device (30) comprises a steel belt (31), a steel belt clamp (32), a bolt and nut (33), a rope end adapter (34), a fixing nut (35), a tension sensor (36), and a hook screw (37). One end of the steel belt (31) passes through the steel belt clamp (32) and passes around a pulley in the rope end adapter (34). The steel belt (31) is wound around the steel belt clamp (32) and fixed in the steel belt clamp (32) by the bolt and nut (33). One end of the tension sensor (36) is fixedly connected to the rope end adapter (34) by the fixing nut (35). The other end of the tension sensor (36) is fixedly connected to the hook screw (37). The hook screw (37) is fixedly connected to the floating loading bracket (20).

5. The composite steel strip friction and wear testing device according to claim 1, characterized in that: The central transmission device (40) comprises a stepper motor (41), a first motor fixing plate (42), a coupling (43), a transmission shaft (44), a traction wheel (45), a bearing and a bearing seat (46), a support base (47), and the traction wheel (45) and the stepper motor (41) are fixed at the center position of the shaft. One end of the stepper motor (41) is fixedly connected to the first motor fixing plate (42). The output shaft of the stepper motor (41) passes through the first motor fixing plate (42) and is fixedly connected to the coupling (43). The coupling (43) is fixedly connected to one end of the transmission shaft (44). The surface of the transmission shaft (44) is fixedly connected to the traction wheel (45), and the two ends of the transmission shaft (44) are rotatably connected to the inner cavity of the bearing and the bearing seat (46). The bottom of the bearing and the bearing seat (46) is fixedly connected to the support base (47).

6. The composite steel strip friction and wear testing device according to claim 1, characterized in that: The worm gear transmission device comprises a motor (51), a turbine (52), a worm (53), a screw rod (54), a screw seat (55), a bearing seat (56), and a second motor fixing plate (57); one side of the motor (51) is fixedly connected to the surface of the second motor fixing plate (57); the output end of the motor (51) passes through the second motor fixing plate (57) and is fixedly connected to the worm (53); both ends of the worm (53) are rotatably connected to the bearing seat (56); the bearing seat (56) is fixedly connected to the surface of the base frame (16); the worm (53) and the turbine (52) are meshed with each other; the turbine (52) and the screw rod (54) are fixedly connected; and the screw seat (55) is slidably connected to the surface of the screw rod (54).

7. The method for using the composite steel strip friction and wear testing device according to claims 1-6, characterized in that: The method comprises the following steps: Step 1: Specifically, the vertical guide rail (12) is fixed on the vertical rod (11), the vertical rod (11) is connected and fixed to the horizontal rod (18), one end of the profile reinforcement rib (17) is fixed to the vertical rod (11), and the other end is fixed to the bottom plate (19) together with the end of the vertical rod to form a triangular reinforcement rib, the bottom plate (19) is fixed to the horizontal slider (14), the horizontal slider (14) slides in cooperation with the horizontal guide rail (15) fixed on the base frame (16), and the columns on both sides of the integral bracket (10) are moved in the direction of the horizontal guide rail (15) through the horizontal slider (14). Step 2: The guide rail (23) is fixed on both sides of the load-bearing plate (24), one end of the slider connecting plate (21) is fixed to the rectangular frame (26) and the other end is fixed to the slider (22), the slider (22) and the guide rail (23) slide in cooperation, the middle part of the transverse mounting plate (25) is fixed on the rectangular frame (26), and both ends of the transverse mounting plate (25) are fixed on the vertical slider (13), so that the floating loading bracket (20) moves in the vertical direction and the rectangular frame moves along the direction of the load-bearing plate guide rail. Step 3: One end of the steel belt (31) passes through the steel belt clamp (32) around the pulley in the rope end adapter (34), rewinds through the steel belt clamp (32) and is fixed in the steel belt clamp by bolts and nuts (33). One end of the tension sensor (36) is fixed to the rope end adapter (34) through a fixing nut (35) and the other end is fixedly connected to the eye screw. The hook screw (37) is connected and fixed to the horizontal mounting plate with a eye at the lower end of the floating loading bracket (20). The lower end of the steel belt contacts the traction wheel, and the other end of the steel belt is fixed in the steel belt clamp on the other side according to the above method. Step 4: The motor shaft is fixed to one end of the transmission shaft (44) through a coupling (43), and the traction wheel (45) is fixed on the transmission shaft (44). The two ends of the transmission shaft (44) cooperate with the bearing seat (46) fixed on the support base (47) to rotate the stepping motor (41) to drive the traction wheel (45) to rotate. Step 5: The worm shaft (53) is matched with the hole of the motor shaft (51), and the two ends of the worm (53) are fixed by the bearing seat (56) fixed on the bottom frame of the integral support. The turbine (52) is located on the spiral rod (54) and meshes with the worm (53) for transmission. The two ends of the spiral rod (54) are meshed with the spiral seat (55) fixed on the bottom plate (19) of the integral support. The middle part of the spiral rod (54) is fixedly supported by the bearing seat (56) fixed on the connecting cross bar of the bottom frame (16) of the integral support. The motor (51) drives the worm (53) to rotate, and the worm (53) drives the turbine (52) and the spiral rod (54) to rotate, thereby driving the spiral seat (55) to move along the direction of the spiral rod (54). Specifically, the two worms (53) and the turbine (52) are left-handed and right-handed respectively, and at the same time, the spiral seats (55) at the two ends are left-handed and right-handed, so that the spiral seats (55) at the two ends move inward and outward at the same time.

8. A composite steel strip friction and wear testing device according to claims 1-7, characterized in that: A composite steel strip friction and wear test method is provided, the method comprising the following steps: S1: Installation of the steel belt sample: one end of the steel belt passes through the inside of the steel belt clamp plate and around the pulley in the rope end adapter, then rewinds through the inside of the steel belt clamp plate and is fixed in the steel belt clamp plate by bolts and nuts. One end of the tension sensor is fixed to the rope end adapter by a fixing nut and the other end is fixedly connected to the hook screw. The hook screw is connected and fixed to the horizontal mounting plate with a lifting ring at the lower end of the floating loading bracket. The lower end of the steel belt contacts the traction wheel, and the other end of the steel belt is fixed in the steel belt clamp plate on the other side according to the above method. S2: Friction and wear at different speeds: The motor of the central transmission device uses a stepper motor. By changing the frequency of the stepper motor, the elevator speed is changed to meet the requirements of the steel belt friction and wear test at different speeds; S3: Friction and wear at different sliding distances: When conducting the friction and wear test of the steel belt at different sliding distances, the sliding distance is converted into the number of revolutions of the traction wheel, and further, the number of revolutions of the traction wheel is controlled by sending the number of pulse signals corresponding to different numbers of revolutions to the stepping motor; According to the formula, Calculate the required number of pulses; Wherein, L represents the sliding distance; D represents the diameter of the traction wheel; θ represents the step angle of the stepping motor; S4: Friction and wear under different wrap angles: The motor of the worm gear transmission device rotates to drive the worm, and the turbine on the spiral rod meshes with the worm for transmission. The spiral rod cooperates with the spiral seat fixed on the bottom plate of the integral bracket for transmission. The two worms and the turbine are left-handed and right-handed respectively. At the same time, the spiral seats at both ends are left-handed and right-handed respectively, so that the spiral seats at both ends move inward and outward at the same time, driving the left and right side columns of the integral bracket to move in the horizontal direction, thereby changing the wrap angle of the steel belt. Through the formula Get the wrap angle of the steel strip; Among them, b represents the vertical distance from the highest point of the traction wheel to the fixed end of the steel belt; a represents the distance from the fixed end of the steel belt to the center line of the traction wheel; r is the radius of the traction wheel; S5: Friction and wear under different loads: The contact loads at both ends of the steel belt are changed by replacing the weights on the floating loading bracket; S6: Friction and wear test under aging state: First, high temperature and humidity aging is carried out. The steel strip test is carried out at a temperature of 70℃±2℃ and a relative humidity of not less than 90%, and the test time is 168h; after high temperature and humidity aging, a low temperature aging test is carried out at a temperature of -10℃±2℃, and the test time is 96h; after wet temperature aging, wait for the steel strip sample to return to room temperature of 10℃~35℃, and then carry out the test steps of S1, S2, S3, S4, and S5; S7: Collection of test data: a. Use the tension sensor to collect and record the tension at both ends of the steel belt; b. Use a thermal imager to collect and record the surface temperature of the steel strip in the test; c. Use an electron scanning microscope to collect and record the surface morphology of the steel strip after the test; d. Use a precision balance to collect and record the weight of the steel strip before and after the test; e. Recording of friction coefficient: The floating loading bracket provides a load for the steel belt. Driven by the stepper motor, the traction wheel and the steel belt achieve sliding friction wear. The steel belt clamp is connected to the tension sensor to measure the tension on both sides of the steel belt, and the friction coefficient is obtained by the formula: Among them, T1, T2, The tension on both sides of the steel belt, and assuming that T1>T2; e represents the base of the natural pair, e = 2.718282; f represents the equivalent friction coefficient; α represents the wrap angle between the steel belt and the traction wheel; S8: Evaluation of friction and wear degree of steel strip specimens: The friction and wear degree of the specimens is mainly determined by relative comparison of the weight or wear volume and surface morphology of the specimens before and after the test; 1. Use a precision balance to measure the weight of the steel strip sample before and after the test, according to the formula Determine the wear rate; Where K represents the wear rate; V represents the wear volume (mm 3 ); F represents applied load (N); D represents the total sliding stroke (μm); 2. Use a scanning electron microscope to observe the surface of the steel strip sample after the test and analyze the surface morphology and wear mechanism after friction and wear; S9: Tensile breaking test: The steel strip sample after steps S1, S2, S3, S4, S5, S6, S7, and S8 is subjected to a tensile breaking test on a tensile breaking tester to obtain the tensile strength of the steel strip after the friction and wear test.

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