A fatigue testing machine for step chain rollers

Abstract

The present invention relates to the technical field of fatigue detection, and specifically to a fatigue testing machine for step chain rollers, which includes a rear shell, a front shell, a hydraulic cylinder, a motor and a controller. It further includes a test wheel, a transmission assembly, a pressing member, an installation table, a pressure compensation assembly and a roller. The test wheel is connected to the end of the power output shaft of the motor, the transmission assembly is connected to the circumferential surface of the power output shaft of the motor, the pressing member is connected to the outside of the transmission assembly, the installation table is connected to the lower side of the hydraulic cylinder, the pressure compensation assembly is connected to the front side of the installation table, and the roller is connected to the front side of the pressure compensation assembly. The present invention provides a rotating pressing member, and makes the pressing member periodically contact the installation table, changing the position of the installation table, so that the pressure point of the roller deviates from directly below, simulating the real scenario during the operation of the escalator, thereby effectively improving the accuracy of roller fatigue detection.

Description

Technical Field

[0001] The present invention relates to the technical field of fatigue detection, and particularly to a fatigue testing machine for a step chain roller. Background Art

[0002] A step chain is a chain used to transmit mechanical power, usually composed of metal links and rollers spliced together, and can adapt to non-parallel or changing transmission systems. The roller is a key component in the step chain drive. By rolling the roller in a fixed slideway, the friction and wear during the operation of the step chain can be reduced, and the service life of the chain can be extended. During long-term use, the friction and load between the roller and the slideway will cause cracks on the surface of the roller, which easily leads to the failure of the roller and causes safety accidents. In order to reduce the occurrence of safety accidents, enterprises often set up fatigue testing machines to predict the service life of the roller under full load, so as to replace the roller in time. The fatigue testing machine presses the roller against the test wheel with a certain pressure, and drives the test wheel to rotate through a motor, and then drives the roller to rotate. By the high-speed rotation of the test wheel, the service cycle of the roller is accelerated to simulate, so as to detect the ultimate life of the roller.

[0003] The step chain is often used in escalators. Its main function is to support the steps so that the steps can run smoothly in a cycle on the escalator. When people stand on the steps, pressure is exerted on the rollers used to support the steps. As the steps move and the people are transported to the destination, the rollers will move to the lower side of the escalator. At this time, the pressure on the rollers drops rapidly. When the escalator is in an environment with a large flow of people such as a subway station, the rollers are affected by the alternating changes of high pressure and low pressure for a long time, and the deformation of the rollers intensifies, which easily affects the service life of the rollers. However, when the fatigue testing machine performs pressure testing, the pressure value is fixed, and the rollers lack the deformation changes brought about by the pressure changes, resulting in inaccurate detection of the life of the step chain rollers of the escalator. In view of the above problems, some solutions have been proposed in the prior art. For example, through electronic control technology, the pressure applied to the rollers is changed periodically to increase the deformation of the rollers, thereby improving the detection accuracy of the rollers. However, when the escalator is running, it needs to be lifted or lowered. At this time, the rollers will move to the inclined plane of the track. Compared with the contact between the rollers and the plane, the angle of the force application point of the rollers changes (as shown in Figure 1 ), and at this time, the deformation position of the rollers shifts, while the pressure application point of the rollers during the detection by the fatigue detector is always directly below, resulting in inaccurate detection results.

[0004] Therefore, a fatigue testing machine for a step chain roller is proposed. Summary of the Invention

[0005] The object of the present invention is to provide a fatigue testing machine for step chain rollers, which solves the problem that when the fatigue testing machine performs fatigue detection on the rollers, the pressed point of the roller is always directly below, resulting in a gap between the simulated situation and the actual use, and affecting the detection accuracy. By setting a rotating pressing member and making the pressing member periodically contact the mounting table to change the position of the mounting table, the pressed point of the roller deviates from directly below, simulating the real scenario during the operation of the escalator, thereby effectively improving the accuracy of roller fatigue detection.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A fatigue testing machine for step chain rollers includes a rear shell, a front shell, a hydraulic cylinder, a motor and a controller. The front shell is connected to the front side of the rear shell. The hydraulic cylinder is connected to the upper side of the inner cavity of the rear shell. The motor is connected to the lower side of the inner cavity of the rear shell. The controller is connected to the upper side of the front surface of the front shell. It further includes a test wheel, a transmission assembly, a pressing member, a mounting table, a pressure compensation assembly and a roller. The test wheel is connected to the end of the power output shaft of the motor. The transmission assembly is connected to the circumferential surface of the power output shaft of the motor. The pressing member is connected to the outside of the transmission assembly. The mounting table is connected to the lower side of the hydraulic cylinder. The pressure compensation assembly is connected to the front side of the mounting table. The roller is connected to the front side of the pressure compensation assembly. The pressure compensation assembly drives the roller to fit on the surface of the test wheel under the action of the hydraulic cylinder. When the test wheel rotates, the transmission assembly drives the pressing member to periodically contact the mounting table. When the pressing member contacts the mounting table, the hydraulic cylinder increases the pressure of the roller on the surface of the test wheel and drives the roller to move leftward. When the roller moves leftward, the pressure compensation assembly compensates for the difference in the axis distance between the roller and the test wheel caused by the axis movement of the roller.

[0008] Through the above solution, when the motor drives the test wheel to rotate, the power is transmitted to the transmission assembly. The transmission assembly drives the pressing member to move, so that the pressing member contacts the mounting table. When the pressing member contacts the mounting table, the mounting table will move leftward, thereby driving the roller to move leftward. At this time, the position of the test wheel remains unchanged. When the hydraulic cylinder applies pressure to the roller, the pressing direction of the roller deviates from the axis of the test wheel, realizing the simulation of the situation where the roller slide changes from horizontal to inclined due to the change of the escalator angle during the operation of the escalator, effectively improving the detection accuracy and the accuracy of the detection data.

[0009] Preferably, the transmission assembly includes a main gear, a sub-gear, a transmission wheel and a chain. The main gear is connected to the circumferential surface of the motor power output shaft. The sub-gear is meshed and connected to the lower side of the main gear and is rotatably connected to the rear shell. The four transmission wheels are respectively connected to the four corners of the front surface of the rear shell. The chain is wound around the surfaces of the four transmission wheels. The diameter value of the main gear is smaller than the diameter value of the sub-gear. The chain is meshed with the sub-gear. The diameter value of the test wheel is larger than the diameter value of the roller.

[0010] Through the above solution, the diameter value of the test wheel is larger than the diameter value of the roller, so that when the motor drives the test wheel to rotate, the roller needs to rotate multiple circles when the test wheel rotates one circle, extending the rotation path of the roller. At the same time, the diameter value of the main gear is smaller than the diameter value of the sub-gear, so that when the main gear drives the sub-gear to rotate, it is a deceleration movement, thereby increasing the duration of the roller under high pressure and the duration under low pressure, effectively simulating the real escalator application, and thus achieving the purpose of improving the detection accuracy.

[0011] Preferably, the pressing member includes an adjusting strip, a transition strip and a pressing strip. The adjusting strip, the transition strip and the pressing strip are all connected to the outer peripheral surface of the chain. The transition strip is located at both ends of the pressing strip. The adjusting strip is located at one end of the two transition strips away from the pressing strip. The length value of the pressing member is less than half of the length value of the chain.

[0012] Through the above solution, the length value of the pressing member is less than half of the length value of the chain. Furthermore, the total duration of the pressing member controlling the hydraulic cylinder to pressurize the installation table is less than half of the duration of one rotation of the chain, realizing the simulation of the situation where the load-bearing length of the escalator is less than half of the total running length during the operation of the escalator, simulating the real escalator application, and achieving the purpose of improving the detection accuracy.

[0013] Preferably, the pressing strip includes a fixing block and a pressing block. The fixing block and the pressing block are both connected to the outer peripheral surface of the chain. A plurality of the fixing blocks and the pressing blocks are connected end to end. The pressing block is trapezoidal. The smaller end of the pressing block faces the chain. Chamfers are constructed at both ends of the pressing block on the side away from the chain. The thickness value of the fixing block is less than the thickness value of the pressing block.

[0014] Through the above solution, the thickness value of the fixing block is less than the thickness value of the pressing block. During the process of the chain driving the pressing strip to rotate, it will drive the fixing block and the pressing block to contact the installation table. The larger thickness of the pressing block can make the installation table vibrate intermittently, thereby simulating the situation of pedestrians walking on the escalator, and further making the detection structure closer to the real use environment, and further improving the detection accuracy of the roller.

[0015] Preferably, the mounting table includes a fixing plate, a mounting frame, a spring, a movable plate and a locking member. The fixing plate is connected to the lower side of the hydraulic cylinder. The mounting frame is connected to the right side of the front end face of the fixing plate. The spring is connected in the inner cavity of the mounting frame. The movable plate is connected to the left end of the spring. The locking member is connected to the left end of the front side of the movable plate. An arc surface is provided on the side of the transition strip away from the chain.

[0016] Through the above solution, the side of the transition strip away from the chain is arc-shaped. Thus, when the transition strip contacts the locking member, it is convenient for the locking member to slide on the surface of the transition strip.

[0017] Preferably, the locking member includes a positioning plate, a guide groove, a guide rod, a card slot, a slider, a push spring, a limit plate and a control button. The positioning plate is connected to the left side of the front end face of the movable plate. The guide groove is opened on the front side of the fixing plate. The guide rod is connected to the upper side inside the positioning plate. The card slot is opened on the front side of the guide rod. The right side of the top of the positioning plate is inclined. The slider is connected in the card slot and extends out of the inclined surface of the positioning plate. The push spring is connected to the front end of the guide rod. The limit plate is connected to the front side of the card slot. The control button is connected to the right side of the positioning plate. The right side of the control button is arc-shaped. The top of the limit plate is inclined. When the slider moves, it contacts the inclined surface of the limit plate. Thus, the right side of the top of the positioning plate is inclined, which is convenient for the slider to contact the transition strip. The right side of the control button is arc-shaped, reducing the resistance when the control button contacts the pressing block.

[0018] Preferably, the guide rod passes through the movable plate and is adaptively clamped with the guide groove. When the arc surface of the transition strip contacts the inclined surface of the positioning plate, the slider pushes the guide rod to move forward through the limit plate. Thus, the clamping of the guide rod and the guide groove realizes the limitation of the movable plate, effectively ensuring the vertical pressing between the roller and the test wheel. By setting the slider, it is convenient to separate the guide rod from the guide groove, thereby releasing the limitation on the movable plate.

[0019] Preferably, the distance value between the upper and lower sides of the right end face of the positioning plate is h, and the distance value between the two pressing blocks is g. The h is greater than g. Thus, when the positioning plate slides on the surface of the pressing strip, the two pressing blocks can always support the positioning plate. At the same time, the control button will pop up, reducing the output power of the hydraulic cylinder. Through the intermittent setting of the pressing blocks, the control button will pop up intermittently, thereby achieving the purpose of simulating the walking of pedestrians on the elevator, and further improving the accuracy of the fatigue test of the roller.

[0020] Preferably, the supplementary pressure component includes a swing arm, a cross plate and a limit strip. The right end of the swing arm is connected to the front side of the movable plate. The cross plate is connected to the front side of the fixing plate. The limit strip is connected to the lower side of the cross plate. The roller is connected to the left end of the swing arm. When the pressing member is separated from the mounting table, the axis of the roller and the axis of the test wheel are in the same vertical plane of the horizontal plane.

[0021] Through the above solution, in the initial state, the contact position between the roller and the test wheel can be maintained, simulating the situation where the roller is vertically stressed under pressure, thereby achieving the purpose of improving the detection accuracy.

[0022] Preferably, the lower end surface of the limiting strip is arc-shaped, and the arc surface of the limiting strip is sprayed with a wear-resistant coating.

[0023] Through the above solution, when the movable plate drives the swing arm to move, the swing arm can rotate along the arc surface of the limiting strip, thereby realizing the adjustment of the distance between the roller and the test wheel, effectively ensuring the pressure between the roller and the test wheel, and thus achieving the purpose of improving the accuracy of the roller fatigue detection.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. The present invention solves the problem that when the fatigue tester performs the fatigue detection of the roller, the pressure point of the roller is always directly below, resulting in a gap between the simulated situation and the actual use, affecting the detection accuracy. By setting the pressing member, during the process of the transmission component driving the pressing member to operate, the transition strip will squeeze the slider so that the guide rod is separated from the guide groove. As the pressing member moves, the pressing member will cause the movable plate to move horizontally, thereby driving the roller to move horizontally, changing the contact position between the roller and the test wheel. The contact position between the roller and the test wheel shifts from directly below to the side, thereby simulating the real application scenario of the roller and improving the accuracy of the roller fatigue detection.

[0026] 2. By setting the pressure compensation component, when the movable plate moves horizontally, it will drive the swing arm to move horizontally, causing the left end surface of the swing arm to contact the limiting strip. The arc surface of the limiting strip will deflect the left side of the swing arm, realizing the downward pressure on the roller when the roller moves horizontally, compensating for the pressure loss between the roller and the test wheel when the roller moves horizontally, and effectively improving the accuracy of the roller fatigue detection.

[0027] 3. By setting the pressing member, the thickness value of the fixed block is less than the thickness value of the pressing block. During the movement of the pressing member, when the control button contacts the pressing block, it will shrink into the positioning plate, and when the control button contacts the fixing plate, it will pop out. By alternately contacting the fixed block and the pressing block with the control button, the purpose of controlling the hydraulic cylinder to change the output pressure multiple times is realized, simulating the influence of pedestrians walking on the escalator on the pressure change of the roller, and thus effectively improving the accuracy of the roller fatigue detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the pressure-bearing state when the escalator roller is in use;

[0029] Figure 2 Schematic diagram of the overall structure of the present invention;

[0030] Figure 3 This is a schematic structural view of the transmission component part of the present invention;

[0031] Figure 4 This is a schematic structural view of the pressing member part of the present invention;

[0032] Figure 5 This is the present invention Figure 4 An enlarged schematic view of part A in;

[0033] Figure 6 This is a schematic structural view of the mounting table part of the present invention;

[0034] Figure 7 This is a schematic structural view of the pressure compensation component part of the present invention;

[0035] Figure 8 This is a schematic view of the state when the pressing member of the present invention contacts the mounting table.

[0036] In the figure: 1, rear shell; 2, front shell; 3, hydraulic cylinder; 4, motor; 5, controller; 6, test wheel; 7, transmission component; 701, main gear; 702, sub-gear; 703, transmission wheel; 704, chain; 8, pressing member; 801, adjusting bar; 802, transition bar; 803, pressing bar; 8031, fixing block; 8032, pressing block; 9, mounting table; 901, fixing plate; 902, mounting bracket; 903, spring; 904, movable plate; 905, locking member; 9051, positioning plate; 9052, guide groove; 9053, guide rod; 9054, card slot; 9055, slider; 9056, push spring; 9057, limit plate; 9058, control button; 10, pressure compensation component; 1001, swing arm; 1002, cross plate; 1003, limit bar; 11, roller. Specific embodiments

[0037] Next, with reference to the accompanying drawings of the embodiments of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described, making its working state and structural features more detailed. Obviously, the described embodiments are only partial embodiments of the present invention, not complete embodiments. Based on the embodiments of the present invention, other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] Please refer to Figures 1 to 8 , the present invention provides a fatigue testing machine for a step chain roller, and the technical solution is as follows:

[0039] Specifically, please refer to Figures 1 to 8, A fatigue testing machine for a step chain roller, comprising a rear shell 1, a front shell 2, a hydraulic cylinder 3, a motor 4 and a controller 5. The front shell 2 is connected to the front side of the rear shell 1, and the front shell 2 and the rear shell 1 are connected by bolts. The hydraulic cylinder 3 is fixedly connected to the upper side of the inner cavity of the rear shell 1. The number of hydraulic cylinders 3 is four, and the four hydraulic cylinders 3 are respectively arranged at the four corners of the top of the inner cavity of the rear shell 1. The motor 4 is connected to the lower side of the inner cavity of the rear shell 1, and the motor 4 is fixedly connected to the inner cavity of the rear shell 1. The controller 5 is connected to the upper side of the front surface of the front shell 2. Through the controller 5, the output pressure of the hydraulic cylinder 3 and the output power of the motor 4 can be controlled. It further includes a test wheel 6, a transmission assembly 7, a pressing member 8, a mounting table 9, a pressure compensation assembly 10 and a roller 11. The test wheel 6 is fixedly connected to the end of the power output shaft of the motor 4, and the test wheel 6 rotates synchronously with the power output shaft of the motor 4. The transmission assembly 7 is connected to the circumferential surface of the power output shaft of the motor 4. The pressing member 8 is connected to the outside of the transmission assembly 7. The mounting table 9 is fixedly connected to the lower side of the hydraulic cylinder 3. The pressure compensation assembly 10 is connected to the front side of the mounting table 9. The roller 11 is connected to the front side of the pressure compensation assembly 10. The pressure compensation assembly 10 drives the roller 11 to fit on the surface of the test wheel 6 under the action of the hydraulic cylinder 3. When the test wheel 6 rotates, the transmission assembly 7 drives the pressing member 8 to periodically contact the mounting table 9. When the pressing member 8 contacts the mounting table 9, the hydraulic cylinder 3 increases the pressure of the roller 11 on the surface of the test wheel 6 and drives the roller 11 to move to the left. When the roller 11 moves to the left, the pressure compensation assembly 10 compensates for the difference in the axis between the roller 11 and the axis of the test wheel 6 caused by the axial movement of the roller 11.

[0040] By setting the test wheel 6, the hydraulic cylinder 3 presses the roller 11 on the test wheel 6 through the mounting table 9 and applies a certain pressure to the test wheel 6 to simulate the situation where the roller 11 is on the back of the elevator. The motor 4 drives the test wheel 6 to rotate to simulate the rotation of the roller 11 in the track of the escalator. When the motor 4 drives the test wheel 6 to rotate, the power will be synchronously transmitted to the transmission assembly 7. When the transmission assembly 7 drives the pressing member 8 to move, the pressing member 8 contacts the mounting table 9 and squeezes the mounting table 9. At this time, the controller 5 controls the hydraulic cylinder 3 to increase the power output to simulate the pressing situation when the escalator is in the front and there are pedestrians standing. As the pressing member 8 moves, the mounting table 9 drives the roller 11 to move to the left. At this time, the position of the test wheel 6 remains unchanged, and there is a displacement between the roller 11 and the test wheel 6. Furthermore, the contact position between the roller 11 and the test wheel 6 changes, thus simulating the situation where the roller 11 is on the inclined track of the escalator. By simulating the horizontal movement and the inclined movement in the pressing environment respectively, the accuracy of the fatigue detection of the roller 11 is effectively improved.

[0041] As an implementation manner of the present invention, referring to Figure 3 , Figure 4 , Figure 5 and Figure 8, the transmission assembly 7 includes a main gear 701, a sub-gear 702, a transmission wheel 703 and a chain 704. The main gear 701 is fixedly connected to the circumferential surface of the power output shaft of the motor 4. When the motor 4 drives the test wheel 6 to rotate, it will drive the main gear 701 to rotate. The sub-gear 702 is meshed and connected to the lower side of the main gear 701 and is rotatably connected to the rear shell 1. The rotation of the main gear 701 will drive the sub-gear 702 to rotate. The four transmission wheels 703 are respectively connected to the four corners of the front surface of the rear shell 1. The chain 704 is wound around the surfaces of the four transmission wheels 703. The chain 704 is limited by the transmission wheels 703 to form a rectangle. The diameter value of the main gear 701 is smaller than the diameter value of the sub-gear 702. The main gear 701 rotates multiple circles while the sub-gear 702 rotates one circle. The chain 704 is meshed with the sub-gear 702. When the sub-gear 702 rotates, it can drive the chain 704 to move on the surface of the transmission wheel 703. The diameter value of the test wheel 6 is larger than the diameter value of the roller 11. The pressing member 8 includes an adjusting strip 801, a transition strip 802 and a pressing strip 803. The adjusting strip 801, the transition strip 802 and the pressing strip 803 are all connected to the outer peripheral surface of the chain 704. The transition strip 802 is located at both ends of the pressing strip 803. The adjusting strip 801 is located at one end of the two transition strips 802 away from the pressing strip 803. The thickness value of the adjusting strip 801 is smaller than the thickness value of the pressing strip 803. An arc surface is provided on the side of the transition strip 802 away from the chain 704. The adjusting strip 801 can be transitioned to the pressing strip 803 through the arc surface of the transition strip 802. When the pressing member 8 is unfolded, the length value at both ends of the pressing member 8 is smaller than half of the length value of the chain 704 after unfolding. During the operation of the escalator, the length of the working area of the escalator is smaller than the length of the non-working area. By adjusting the length value of the pressing member 8, the actual use situation of the roller 11 can be simulated, and thus the accuracy of the fatigue detection of the roller 11 can be effectively improved. The pressing strip 803 includes a fixing block 8031 and a pressing block 8032. The fixing block 8031 and the pressing block 8032 are both connected to the outer peripheral surface of the chain 704. A plurality of the fixing blocks 8031 and the pressing blocks 8032 are connected end to end, and both ends of the arrangement of the pressing strip 803 are the pressing blocks 8032. The pressing block 8032 is trapezoidal. The smaller end of the pressing block 8032 faces the chain 704. Thus, when the pressing block 8032 contacts the mounting table 9, the extrusion force generated by the mounting table 9 is borne by the pressing block 8032. The force received acts vertically on the chain 704 on the one hand, and on the other hand, the pressing block 8032 disperses the force through the trapezoidal surface and acts on the fixing block 8031, realizing the transmission of the force to the chain 704 at the fixing block 8031. The chain 704 at the fixing block 8031 adjacent to the pressing block 8032 bears part of the pressure, effectively increasing the force-bearing area of the chain 704 when the mounting table 9 contacts the pressing block 8032, and thus improving the running stability of the chain 704, facilitating a single long-term test. Through the single long-term test,Effectively improves the detection accuracy.

[0042] By setting the motor 4, the motor 4 drives the test wheel 6 to rotate, the test wheel 6 drives the roller 11 to rotate for detecting the wear of the roller 11. When the motor 4 drives the test wheel 6 to rotate, it can drive the main gear 701 to rotate. The main gear 701 drives the chain 704 to rotate around the transmission wheel 703 through the sub-gear 702. When the chain 704 rotates, it drives the pressing member 8 to move. The pressing member 8 moves to squeeze the mounting table 9, thereby causing the mounting table 9 to move horizontally. The horizontal movement of the mounting table 9 adjusts the contact between the test wheel 6 and the roller 11, causing the pressure point of the roller 11 to shift from directly below, simulating the change in the contact point between the roller 11 and the slideway when the roller 11 in the working area of the escalator is in the ascending or descending stage during the operation of the escalator, and thus improving the detection accuracy.

[0043] As an implementation manner of the present invention, refer to Figure 6 、 Figure 7 and Figure 8, the mounting table 9 includes a fixed plate 901, a mounting frame 902, a spring 903, a movable plate 904 and a locking member 905. The fixed plate 901 is fixedly connected to the lower side of the hydraulic cylinder 3. The mounting frame 902 is fixedly connected to the right side of the front end face of the fixed plate 901. The right end of the spring 903 is connected to the inner cavity of the mounting frame 902. The movable plate 904 is connected to the left end of the spring 903. The movable plate 904 is slidably connected to the fixed plate 901. The locking member 905 is connected to the left end of the front side of the movable plate 904. The locking member 905 includes a positioning plate 9051, a guide groove 9052, a guide rod 9053, a card slot 9054, a slider 9055, a push spring 9056, a limit plate 9057 and a control button 9058. The positioning plate 9051 is connected to the left side of the front end face of the movable plate 904. The guide groove 9052 is opened on the front side of the fixed plate 901. The guide rod 9053 is connected to the upper side of the inside of the positioning plate 9051. The guide rod 9053 is slidably connected to the positioning plate 9051. The card slot 9054 is opened on the front side of the guide rod 9053. The right side of the top of the positioning plate 9051 is inclined. The inclined surface of the top of the positioning plate 9051 will contact the arc surface of the transition strip 802. The slider 9055 is connected to the card slot 9054 and extends out of the inclined surface of the positioning plate 9051. When the inclined surface of the top of the positioning plate 9051 contacts the arc surface of the transition strip 802, the slider 9055 will be pressurized, so that the slider 9055 slides towards the side of the guide rod 9053. The limit plate 9057 is connected to the front side of the card slot 9054. The top of the limit plate 9057 is inclined. At this time, the slider 9055 will squeeze the limit plate 9057. The limit plate 9057 is fixedly connected to the guide rod 9053. Furthermore, the guide rod 9053 will move forward. The push spring 9056 is connected to the front end of the guide rod 9053. The spring 903 contracts under pressure. Since the guide rod 9053 passes through the movable plate 904 and is adaptively clamped with the guide groove 9052, the guide rod 9053 is separated from the guide groove 9052 when it moves forward. The control button 9058 is connected to the right side of the positioning plate 9051. The right side of the control button 9058 is arc-shaped. In the initial state (the initial state means that the pressing member 8 does not contact the mounting table 9), the control button 9058 pops out of the right side of the positioning plate 9051. The control button 9058 is electrically connected to the hydraulic cylinder 3 through the controller 5. When the control button 9058 is pressed, the output of the hydraulic cylinder 3 can be increased, and the pressing depth of the control button 9058 is positively correlated with the output of the hydraulic cylinder 3. When the chain 704 drives the pressing member 8 to rotate, the adjusting strip 801 will first contact the control button 9058, so that the control button 9058 retracts into the positioning plate 9051. The hydraulic cylinder 3 will increase the pressure applied to the roller 11. Furthermore, the state simulation of the horizontal movement of the working area of the escalator roller 11 is realized. As the chain 704 moves, the control button 9058 moves from the adjusting strip 801 to the pressing strip 803 through the transition strip 802. At this time, the control button 9058 is in the inner cavity of the positioning plate 9051.By maintaining the pressure on the positioning plate 9051 and further moving the pressure strip 803, the control button 9058 will slide on the surfaces of the fixed block 8031 and the pressure block 8032. Since the thickness of the fixed block 8031 is less than the thickness of the pressure block 8032, a part of the control button 9058 will pop out when it moves to the fixed block 8031, causing the hydraulic cylinder 3 to reduce the pressure applied to the roller 11. When the control button 9058 moves to the pressure block 8032, the control button 9058 shrinks to the inner cavity of the positioning plate 9051, and the hydraulic cylinder 3 increases the pressure applied to the roller 11. The staggered arrangement of the fixed block 8031 and the pressure block 8032 causes the control button 9058 to periodically control the hydraulic cylinder 3 to change the pressure applied to the roller 11, thereby The escalator simulates the pressure state of the roller 11 when a pedestrian walks on the escalator, thereby effectively improving the detection accuracy of the fatigue of the roller 11. The arc setting of the right side of the button and the chamfered setting of the pressure block 8032 at both ends of the side away from the chain 704 make the button have less resistance when sliding on the surface of the pressure block 8032 and the fixed block 8031. The pressure block 8032 is chamfered at both ends of the side away from the chain 704. By setting the chamfers, the friction of the mounting platform 9 when sliding on the surface of the pressure block 8032 is effectively reduced. The thickness of the fixed block 8031 is less than the thickness of the pressure block 8032. When the arc surface of the transition strip 802 contacts the inclined surface of the positioning plate 9051, the slider 9055 pushes the guide rod 90 through the limit plate 9057. 53 moves forward, the distance value between the upper and lower sides of the right end surface of the positioning plate 9051 is h, the distance value between the two pressure blocks 8032 is g, and the h is greater than g, thereby avoiding the positioning plate 9051 from being stuck between the two pressure blocks 8032, and effectively ensuring the stability of the positioning plate 9051 moving on the surface of the pressure bar 803. The pressure compensation component 10 includes a swing arm 1001, a cross plate 1002 and a limit bar 1003. The right end of the swing arm 1001 is connected to the front side of the movable plate 904, the swing arm 1001 is rotatably connected to the movable plate 904, the upper side of the swing arm 1001 is magnetic, and the cross plate 1002 is connected to the front side of the fixed plate 901. In the initial state, the swing arm 1001 is in contact with the cross plate 1002 through magnetic force. 1003 is connected to the lower side of the cross plate 1002, the limit bar 1003 is connected to the cross plate 1002 by bolts, the roller 11 is connected to the left end of the swing arm 1001, and when the pressure member 8 is separated from the mounting platform 9, the axis of the roller 11 and the axis of the test wheel 6 are in the same vertical plane of the horizontal plane, and the lower end surface of the limit bar 1003 is arc-shaped, and the limit bar 1003 can be adjusted according to the use needs of the roller 11 to ensure that the distance between the roller 11 and the test wheel 6 changes when the roller 11 moves. The arc surface of the limit bar 1003 should be on a circle with the axis of the test wheel 6 as the center and the sum of the radius of the roller 11 and the radius of the test wheel 6 as the radius value. The roller 11 is made of hard material and has a small deformation. The right end of the swing arm 1001 is tangent to the arc surface of the limit bar 1003.Therefore, when the swing arm 1001 moves, the left end of the swing arm 1001 will move downward along the arc surface of the limit bar 1003, and the arc surface of the limit bar 1003 is sprayed with a wear-resistant coating.

[0044] By setting the mounting table 9, the mounting table 9 follows the power output of the hydraulic cylinder 3 to drive the roller 11 to be in contact with the test wheel 6. When the pressing member 8 contacts the mounting table 9, the output intensity of the hydraulic cylinder 3 on the roller 11 is changed. By controlling the contact length between the pressing member 8 and the mounting table 9, the length ratio of the working area to the non-working area of the escalator is simulated, thereby improving the detection accuracy of the fatigue of the roller 11. At the same time, the pressing member 8 can drive the roller 11 to move horizontally through the mounting table 9, changing the contact position between the roller 11 and the test wheel 6, thereby simulating the situation where the pressure point changes when the roller 11 of the escalator rolls on the inclined plane, and further improving the detection accuracy of the fatigue of the roller 11.

[0045] An escalator is divided into a working area and a non-working area. When in the working area, the roller 11 will be affected by the weight of pedestrians. When in the non-working area, the roller 11 is only affected by the gravity of the steps. Therefore, the roller 11 will be affected by the alternating change of high pressure and low pressure during operation. The alternating pressure acting on the roller 11 will affect the service life of the roller 11. In this solution, by setting the chain 704 and the pressing member 8, the total length of the chain 704 is used to simulate the total running length of the roller 11 in the escalator, and the total length of the pressing member 8 is used to simulate the length of the working area of the roller 11 in the escalator, restoring the use situation of the roller 11 of the escalator step chain being pressed and not pressed during operation, thereby improving the detection accuracy of the fatigue of the roller 11. The specific method is as follows:

[0046] Install the roller 11 on the swing arm 1001. At this time, the axis of the roller 11 and the axis of the test wheel 6 are on the same vertical plane in the horizontal plane. The hydraulic cylinder 3 drives the roller 11 to move down through the mounting table 9 to contact and apply pressure to the test wheel 6. At this time, the contact pressure between the roller 11 and the test wheel 6 is the pressure applied to the roller 11 in the non - working area of the escalator. The motor 4 drives the test wheel 6 to rotate, and the friction between the test wheel 6 and the roller 11 will drive the roller 11 to rotate, so as to simulate the scene when the roller 11 rolls in the slideway during the operation of the escalator. When the output shaft of the motor 4 rotates, it will drive the main gear 701 to rotate. The main gear 701 drives the chain 704 to rotate through the secondary gear 702. When the chain 704 rotates one week, it means that the roller 11 moves one week in the escalator. As the chain 704 moves, the chain 704 will drive the pressure - applying member 8 to contact the control button 9058 of the mounting table 9, and the control button 9058 will cause the hydraulic cylinder 3 to pressurize. The pressure applied by the hydraulic cylinder 3 acts on the roller 11, so as to simulate the scene when the roller 11 is in the working area during the operation of the escalator. As the chain 704 moves, the pressure - applying member 8 separates from the mounting table 9. At this time, the control button 9058 pops out, and the hydraulic cylinder 3 reduces the pressure on the roller 11, so as to simulate the scene when the roller 11 is in the non - working area during the operation of the escalator. Through the operation of the pressure - applying member 8, the roller 11 is alternately stressed, thereby effectively improving the accuracy of the fatigue detection of the roller 11;

[0047] Since the roller 11 needs to pass through a straight section and an inclined section during the operation of the escalator, when in the straight section, the pressure point of the roller 11 is directly below the roller 11. When in the inclined section, the pressure point of the roller 11 is inclined. At this time, the deformation amount and deformation position of the roller 11 change, which is likely to affect the service life of the roller 11. In the present invention, by providing an installation table 9, when the adjustment bar 801 contacts the installation table 9, it will squeeze the installation table 9, causing the installation table 9 to move horizontally, thereby changing the contact position between the roller 11 and the test wheel 6, so as to simulate the change of the pressure position of the roller 11 during actual application, and then improve the accuracy of the fatigue detection of the roller 11. Specifically, during the movement of the adjustment bar 801, the transition bar 802 will fit against the inclined surface of the positioning plate 9051, thereby generating a pressure on the slider 9055. The slider 9055 causes the guide rod 9053 to move out of the guide groove 9052 by squeezing the inclined surface of the limiting plate 9057. At this time, the limit on the movable plate 904 is released. Further movement of the transition bar 802 will cause the positioning plate 9051 to move onto the pressure bar 803, thereby realizing the horizontal movement of the movable plate 904. The horizontal movement of the movable plate 904 will drive the roller 11 to move horizontally through the swing arm 1001. At this time, the contact position between the roller 11 and the test wheel 6 changes, thereby simulating the scenario of the roller 11 running on the inclined section of the escalator. At the same time, the movement of the roller 11 increases the distance between the axis of the roller 11 and the axis of the test wheel 6; in order to maintain the distance between the axis of the roller 11 and the axis of the test wheel 6, by providing a limiting bar 1003, when the swing arm 1001 moves horizontally, it will contact the limiting bar 1003. The arc surface of the limiting bar 1003 will cause the left side of the swing arm 1001 to deflect downward, and the left side of the swing arm 1001 drives the roller 11 to move downward, compensating for the height difference between the roller 11 and the test wheel 6, thereby compensating for the pressure loss between the roller 11 and the test wheel 6 caused by the horizontal movement of the roller 11, effectively improving the accuracy of the fatigue detection of the roller 11;

[0048] Since the pedestrian's movement on the escalator will cause a periodic change in the pressure on the roller 11 again when the escalator roller 11 is in the working area, which will affect the service life of the roller 11. To detect this situation, in this solution, by setting a pressing strip 803 with a height change, when the control button 9058 contacts the pressing strip 803, it will pop out and retract periodically. Through the popping out and retracting of the button, the hydraulic cylinder 3 is controlled to change the applied pressure, realizing the simulation of the pressure on the roller 11 when a pedestrian walks on the escalator. Specifically, when the positioning plate 9051 drives the control button 9058 to slide on the surface of the pressing strip 803, the control button 9058 will contact the pressing block 8032. At this time, the pressing block 8032 will cause the control button 9058 to contract into the positioning plate 9051. As the pressing member 8 moves, the control button 9058 moves to the fixed block 8031. Since the thickness value of the fixed block 8031 is small, the control button 9058 will pop out. The popping out of the control button 9058 will cause the hydraulic cylinder 3 to reduce the output pressure. Through the alternating arrangement of the fixed block 8031 and the pressing block 8032, the alternating change of the pressure when a pedestrian walks on the escalator is realized, and thus the accuracy of the fatigue detection of the roller 11 is effectively improved;

[0049] When the pressing member 8 is separated from the mounting table 9, the control button 9058 pops out. At this time, the pressure applied by the hydraulic cylinder 3 to the roller 11 decreases, and the spring 903 drives the movable plate 904 to reset, so that the roller 11 resets. The periodic rotation of the pressing member 8 realizes the simulation of the operation of the elevator, and thus achieves the purpose of improving the accuracy of the fatigue detection of the roller 11.

[0050] Although the embodiments of the present invention have been described, for those of ordinary skill in the art, under the understanding of the principles and spirit of the present invention, the embodiments can be changed and modified to obtain other effects. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fatigue testing machine for a step chain roller, comprising a rear shell (1), a front shell (2), a hydraulic cylinder (3), a motor (4) and a controller (5). The hydraulic cylinder (3) is connected to the upper side of the inner cavity of the rear shell (1), and the motor (4) is connected to the lower side of the inner cavity of the rear shell (1). It is characterized in that: It further includes a test wheel (6), a transmission component (7), a pressing member (8), a mounting table (9), a pressure compensation component (10) and a roller (11). The test wheel (6) is connected to the end of the power output shaft of the motor (4). The transmission component (7) is connected to the circumferential surface of the power output shaft of the motor (4). The pressing member (8) is connected to the outside of the transmission component (7). The mounting table (9) is connected to the lower side of the hydraulic cylinder (3). The pressure compensation component (10) is connected to the front side of the mounting table (9). The roller (11) is connected to the front side of the pressure compensation component (10). The pressure compensation component (10) drives the roller (11) to fit on the surface of the test wheel (6) under the action of the hydraulic cylinder (3). When the test wheel (6) rotates, the transmission component (7) drives the pressing member (8) to periodically contact the mounting table (9). When the pressing member (8) contacts the mounting table (9), the hydraulic cylinder (3) increases the pressure of the roller (11) on the surface of the test wheel (6) and drives the roller (11) to move leftward. When the roller (11) moves leftward, the pressure compensation component (10) compensates for the difference in the axis of the roller (11) moving to the axis of the test wheel (6). The transmission component (7) includes a main gear (701), a sub-gear (702), a transmission wheel (703) and a chain (704). The main gear (701) is connected to the circumferential surface of the power output shaft of the motor (4). The sub-gear (702) is meshed and connected to the lower side of the main gear (701) and is rotatably connected to the rear housing (1). The four transmission wheels (703) are respectively connected to the four corners of the front surface of the rear housing (1). The chain (704) is wound around the surfaces of the four transmission wheels (703). The diameter value of the main gear (701) is smaller than the diameter value of the sub-gear (702). The chain (704) is meshed with the sub-gear (702). The pressing member (8) includes an adjusting strip (801), a transition strip (802) and a pressing strip (803). The adjusting strip (801), the transition strip (802) and the pressing strip (803) are all connected to the outer circumferential surface of the chain (704). The transition strip (802) is located at both ends of the pressing strip (803). The adjusting strip (801) is located at one end of the two transition strips (802) away from the pressing strip (803). The length value of the pressing member (8) is less than half of the length value of the chain (704). The pressing strip (803) includes a fixing block (8031) and a pressing block (8032). The fixing block (8031) and the pressing block (8032) are both connected to the outer circumferential surface of the chain (704). A plurality of the fixing blocks (8031) and the pressing blocks (8032) are connected end to end. The pressing block (8032) is trapezoidal. The smaller end of the pressing block (8032) faces the chain (704). Chamfers are constructed at both ends of the side of the pressing block (8032) away from the chain (704). The thickness value of the fixing block (8031) is less than the thickness value of the pressing block (8032).

2. The fatigue testing machine for a step chain roller according to claim 1, characterized in that: The mounting table (9) includes a fixed plate (901), a mounting frame (902), a spring (903), a movable plate (904), and a locking member (905). The fixed plate (901) is connected to the lower side of the hydraulic cylinder (3). The mounting frame (902) is connected to the right side of the front end face of the fixed plate (901). The spring (903) is connected in the inner cavity of the mounting frame (902). The movable plate (904) is connected to the left end of the spring (903). The locking member (905) is connected to the left end of the front side of the movable plate (904). An arc surface is provided on the side of the transition strip (802) away from the chain (704).

3. A fatigue testing machine for a step chain roller according to claim 2, characterized in that: The locking member (905) includes a positioning plate (9051), a guide groove (9052), a guide rod (9053), a card slot (9054), a slider (9055), a push spring (9056), a limit plate (9057), and a control button (9058). The positioning plate (9051) is connected to the left side of the front end face of the movable plate (904). The guide groove (9052) is opened on the front side of the fixed plate (901). The guide rod (9053) is connected to the upper side inside the positioning plate (9051). The card slot (9054) is opened on the front side of the guide rod (9053). The right side of the top of the positioning plate (9051) is inclined. The slider (9055) is connected in the card slot (9054) and extends out of the inclined surface of the positioning plate (9051). The push spring (9056) is connected to the front end of the guide rod (9053). The limit plate (9057) is connected to the front side of the card slot (9054). The control button (9058) is connected to the right side of the positioning plate (9051). The right side of the control button (9058) is arc-shaped. The top of the limit plate (9057) is inclined. When the slider (9055) moves, it contacts the inclined surface of the limit plate (9057).

4. A fatigue testing machine for a step chain roller according to claim 3, characterized in that: The guide rod (9053) passes through the movable plate (904) and is adaptively clamped with the guide groove (9052). When the arc surface of the transition strip (802) contacts the inclined surface of the positioning plate (9051), the slider (9055) pushes the guide rod (9053) to move forward through the limit plate (9057).

5. A fatigue testing machine for a step chain roller according to claim 4, characterized in that: The distance value between the upper and lower sides of the right end face of the positioning plate (9051) is h, and the distance value between the two pressing blocks (8032) is g, and h is greater than g.

6. The fatigue testing machine for a step chain roller according to claim 5, characterized in that: The supplementary pressure assembly (10) includes a swing arm (1001), a cross plate (1002), and a limit strip (1003). The right end of the swing arm (1001) is connected to the front side of the movable plate (904). The cross plate (1002) is connected to the front side of the fixed plate (901). The limit strip (1003) is connected to the lower side of the cross plate (1002). The roller (11) is connected to the left end of the swing arm (1001). When the pressing member (8) is separated from the mounting table (9), the axis of the roller (11) and the axis of the test wheel (6) are in the same vertical plane of the horizontal plane.

7. The fatigue testing machine for a step chain roller according to claim 6, wherein: The lower end face of the limit strip (1003) is arc-shaped, and the arc surface of the limit strip (1003) is sprayed with a wear-resistant coating.

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