Fatigue testing machine for step chain roller

Abstract

The invention relates to the technical field of fatigue detection, in particular to a step chain roller fatigue testing machine which comprises a rear shell, a front shell, a hydraulic cylinder, a motor and a controller and further comprises a testing wheel, a transmission assembly, a pressure applying piece, a mounting table, a pressure supplementing assembly and a roller. The transmission assembly is connected to the circumferential surface of a power output shaft of the motor, the pressure applying piece is connected to the outer side of the transmission assembly, the mounting table is connected to the lower side of the hydraulic cylinder, the pressure supplementing assembly is connected to the front side of the mounting table, and the rolling wheel is connected to the front side of the pressure supplementing assembly. And the pressure applying piece is periodically contacted with the mounting table, and the position of the mounting table is changed, so that the pressed point position of the roller deviates from the right lower part, the real scene of the roller in the running process of the escalator is simulated, and the fatigue detection precision of the roller is effectively improved.

Description

Technical Field

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

[0002] A step chain is a chain used to transmit mechanical power. It is usually composed of metal links and rollers and can adapt to non-parallel or changing transmission systems. The roller is a key component in the step chain transmission. By rolling the roller in the inherent 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. The friction and load between the roller and the slideway during long-term use will cause cracks on the roller surface, which can easily cause the roller to fail and lead to safety accidents. In order to reduce the occurrence of safety accidents, companies often set up fatigue testing machines to predict the service life of the roller under full load so that the roller can be replaced in time. The fatigue testing machine fits the roller to the test wheel with a certain pressure, and drives the test wheel to rotate through the motor to drive the roller to rotate. The high-speed rotation of the test wheel accelerates the service life of the simulated roller to detect the roller's ultimate life.

[0003] Step chains are often used in escalators. Their main function is to support the steps so that they can circulate smoothly on the escalator. When people stand on the steps, pressure is applied to the rollers supporting the steps. As the steps move and people are transported to their locations, the rollers move to the lower side of the escalator. At this time, the pressure on the rollers decreases 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 and low pressures for a long time, and the deformation of the rollers increases, which can easily affect the service life of the rollers. However, the pressure value is fixed during the pressure test by the fatigue testing machine, and the rollers lack the deformation changes brought about by the pressure changes, resulting in inaccurate detection of the life of the escalator step chain rollers by the fatigue testing machine. In view of the above problems, some solutions have been proposed in the prior art. For example, the pressure applied to the roller is periodically changed through electric control technology to increase the deformation of the roller, thereby improving the detection accuracy of the roller. However, when the escalator is running, it needs to be lifted or lowered. At this time, the roller will move to the inclined surface of the track. Compared with the contact between the roller and the plane, the angle of the roller force point changes (such as Figure 1 As shown in the figure, the deformation position of the roller is offset at this time, while the pressure point of the roller is always directly below during the fatigue testing machine testing, which leads to inaccurate test results.

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

[0005] The purpose of the present invention is to provide a fatigue testing machine for a step chain roller, which solves the problem that when the fatigue testing machine performs fatigue detection on the roller, the pressure point of the roller is always directly below, which leads to a gap between the simulation situation and the actual use, affecting the detection accuracy. By providing a rotating pressure piece and making the pressure piece periodically contact with the mounting table, the position of the mounting table is changed, so that the pressure point of the roller is offset from directly below, thereby simulating the real scene of the roller in the operation process 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 a step chain roller, comprising a rear shell, a front shell, a hydraulic cylinder, a motor and a controller, wherein 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, and further comprises a test wheel, a transmission assembly, a pressure member, a mounting platform, a pressure compensation assembly and a roller, wherein the test wheel is connected to the end of the motor power output shaft, the transmission assembly is connected to the circumferential surface of the motor power output shaft, the pressure member is connected to the transmission assembly On the outside, the mounting platform is connected to the lower side of the hydraulic cylinder, the pressure-compensating assembly is connected to the front side of the mounting platform, and the roller is connected to the front side of the pressure-compensating assembly. The pressure-compensating assembly drives the roller to fit the surface of the test wheel under the action of the hydraulic cylinder. When the test wheel rotates, the transmission assembly drives the pressure-applying member to periodically contact the mounting platform. When the pressure-applying member contacts the mounting platform, the hydraulic cylinder increases the pressure of the roller on the surface of the test wheel and drives the roller to move to the left. When the roller moves to the left, the pressure-compensating assembly compensates for the difference between the roller axis and the test wheel axis caused by the movement of the roller axis.

[0008] Through the above scheme, when the motor drives the test wheel to rotate, the power is transmitted to the transmission assembly, and the transmission assembly drives the pressure piece to move, so that the pressure piece contacts the mounting platform. When the pressure piece contacts the mounting platform, the mounting platform moves to the left, thereby driving the roller to move to the left. At this time, the position of the test wheel remains unchanged. When the hydraulic cylinder applies pressure to the roller, the pressure direction of the roller deviates from the axis of the test wheel, realizing the simulation of the escalator operation process. The change in the angle of the escalator causes the roller slide to change from horizontal to inclined, effectively improving the accuracy of the detection 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, and the diameter value of the test wheel is larger than the diameter value of the roller.

[0010] Through the above scheme, the diameter of the test wheel is larger than the diameter of the roller, so that when the motor drives the test wheel to rotate, the roller needs to rotate multiple circles for each rotation of the test wheel, thereby extending the rotation path of the roller. At the same time, the diameter of the main gear is smaller than the diameter of the sub-gear, so that when the main gear drives the sub-gear to rotate, it decelerates, thereby increasing the high pressure and low pressure time of the roller, effectively simulating the real escalator application, thereby achieving the purpose of improving the detection accuracy.

[0011] Preferably, the pressure member includes an adjustment bar, a transition bar and a pressure bar, and the adjustment bar, transition bar and pressure bar are all connected to the outer circumference of the chain, the transition bar is located at both ends of the pressure bar, the adjustment bar is located at one end of the two transition bars away from the pressure bar, and the length of the pressure member is less than half of the length of the chain.

[0012] Through the above scheme, the length of the pressure piece is less than half of the length of the chain, and then the total time that the pressure piece controls the hydraulic cylinder to pressurize the mounting platform is less than half of the time it takes for the chain to rotate one circle. This achieves the situation in which the load-bearing length of the escalator is less than half of the total running length during the operation of the escalator, simulates the actual escalator application, and achieves the purpose of improving the detection accuracy.

[0013] Preferably, the pressure bar includes a fixed block and a pressure block, and the fixed block and the pressure block are both connected to the outer circumferential surface of the chain, and a plurality of the fixed blocks and the pressure blocks are connected end to end, and the pressure block is trapezoidal, with the smaller end of the pressure block facing the chain, and both ends of the pressure block away from the chain are chamfered, and the thickness of the fixed block is smaller than the thickness of the pressure block.

[0014] Through the above scheme, the thickness of the fixed block is smaller than the thickness of the pressure block. When the chain drives the pressure bar to rotate, it will drive the fixed block and the pressure block to contact the mounting table. The larger thickness of the pressure block can cause the mounting table to vibrate intermittently, thereby simulating the situation of pedestrians walking on the escalator, thereby making the detection structure close to the actual usage environment, thereby further improving the detection accuracy of the roller.

[0015] Preferably, the mounting platform includes a fixed plate, a mounting frame, a spring, a movable plate and a locking piece, the fixed plate is connected to the lower side of the hydraulic cylinder, the mounting frame is connected to the right side of the front end surface of the fixed plate, the spring is connected to the inner cavity of the mounting frame, the movable plate is connected to the left end of the spring, the locking piece is connected to the left end of the front side of the movable plate, and the transition bar is provided with an arc surface on the side away from the chain.

[0016] With the above solution, the side of the transition bar away from the chain is arc-shaped, so when the transition bar contacts the locking piece, it is convenient for the locking piece to slide on the surface of the transition bar.

[0017] Preferably, the locking member includes a positioning plate, a guide slot, 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 surface of the movable plate, the guide slot is opened at the front side of the fixed plate, the guide rod is connected to the upper side of the inside of the positioning plate, the card slot is opened at 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, and the slider contacts with the inclined surface of the limit plate when it moves. Therefore, the right side of the top of the positioning plate is inclined, which is convenient for the slider to contact with the transition strip, and the right side of the control button is arc-shaped, which reduces the resistance when the control button contacts with the pressure block.

[0018] Preferably, the guide rod passes through the movable plate and is adapted to be engaged 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 forward through the limit plate. Thus, the engagement of the guide rod and the guide groove realizes the limitation of the movable plate, effectively ensuring the vertical pressure 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 of the movable plate.

[0019] Preferably, the distance value on the upper and lower sides of the right end surface of the positioning plate is h, the spacing value between the two pressure blocks is g, and h is greater than g. Therefore, when the positioning plate slides on the surface of the pressure bar, the two pressure blocks can always maintain support for the positioning plate, and at the same time, the control button will pop out to reduce the output power of the hydraulic cylinder. Through the intermittent setting of the pressure block, the control button will pop up intermittently, thereby achieving the purpose of simulating pedestrians walking on the elevator, thereby further improving the accuracy of the roller fatigue test.

[0020] Preferably, the pressure compensation assembly includes a swing arm, a cross plate and a limit bar, 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 fixed plate, the limit bar is connected to the lower side of the cross plate, and the roller is connected to the left end of the swing arm. When the pressure member is separated from the mounting platform, 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 scheme, the contact position between the roller and the test wheel can be maintained in the initial state, simulating the vertical force of the roller 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-shaped surface of the limiting strip is sprayed with a wear-resistant coating.

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

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention solves the problem that when the fatigue testing machine performs fatigue detection on the roller, the pressure point of the roller is always directly below, which leads to a gap between the simulation situation and the actual use, affecting the detection accuracy. By setting a pressure piece, when the transmission component drives the pressure piece to operate, the transition bar will squeeze the slider to separate the guide rod from the guide groove. As the pressure piece moves, the pressure piece will move the movable plate laterally, thereby driving the roller to move laterally, changing the contact position of the roller and the test wheel. The contact position of the roller and the test wheel is offset from directly below to the side, thereby simulating the real application scenario of the roller and improving the accuracy of roller fatigue detection.

[0026] 2. By setting up the pressure compensation component, the movable plate will drive the swing arm to move horizontally when it moves horizontally, so that the left end face of the swing arm contacts the limit bar. The arc surface of the limit bar will cause the left side of the swing arm to deflect, so that the roller is pressurized downward 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 roller fatigue detection.

[0027] 3. By setting the pressure piece, the thickness of the fixed block is smaller than that of the pressure piece. During the movement of the pressure piece, the control button will shrink into the positioning plate when it contacts the pressure block, and will pop out when it contacts the fixed plate. The control button will alternately contact the fixed block and the pressure block, thereby achieving the purpose of controlling the hydraulic cylinder to change the output pressure multiple times, simulating the influence of pedestrians walking on the escalator on the pressure change of the roller, thereby effectively improving the accuracy of roller fatigue detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the compressed state of the escalator roller when in use;

[0029] Figure 2 It is a schematic diagram of the overall structure of the present invention;

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

[0031] Figure 4 It is a structural schematic diagram of the pressure-applying member of the present invention;

[0032] Figure 5 For the present invention Figure 4 The enlarged schematic diagram of point A in the middle;

[0033] Figure 6 It is a structural schematic diagram of the mounting platform part of the present invention;

[0034] Figure 7 It is a structural schematic diagram of the pressure supplement component part of the present invention;

[0035] Figure 8 It is a schematic diagram of the state when the pressure-applying member of the present invention is in contact with the mounting platform.

[0036] In the figure: 1, rear shell; 2, front shell; 3, hydraulic cylinder; 4, motor; 5, controller; 6, test wheel; 7, transmission assembly; 701, main gear; 702, sub-gear; 703, transmission wheel; 704, chain; 8, pressure piece; 801, adjustment bar; 802, transition bar; 803, pressure bar; 8031, fixing block; 8032, pressure block; 9, mounting table; 901, fixing plate; 902, 02. Mounting frame; 903. Spring; 904. Movable plate; 905. Locking piece; 9051. Positioning plate; 9052. Guide groove; 9053. Guide rod; 9054. Slot; 9055. Slider; 9056. Push spring; 9057. Limit plate; 9058. Control button; 10. Compensation pressure assembly; 1001. Swing arm; 1002. Horizontal plate; 1003. Limit strip; 11. Roller. DETAILED DESCRIPTION

[0037] The following is a clear and complete description of the technical solution of the embodiment of the present invention in conjunction with the drawings of the embodiment of the present invention, so that its working state and structural features are more detailed. Obviously, the described embodiment is only a partial embodiment of the present invention, not a complete embodiment. Based on the embodiment of the present invention, other embodiments obtained by ordinary technicians in this field without making any creativity belong to the protection scope of the present invention.

[0038] See also 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] For details, 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, wherein the front shell 2 is connected to the front side of the rear shell 1, the front shell 2 is connected to the rear shell 1 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 the 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, 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, and the output pressure of the hydraulic cylinder 3 and the output power of the motor 4 can be controlled by the controller 5, and also comprises a test wheel 6, a transmission assembly 7, a pressure member 8, a mounting platform 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 follows The transmission assembly 7 rotates synchronously with the power output shaft of the motor 4, the pressure member 8 is connected to the outer side of the transmission assembly 7, the mounting platform 9 is fixedly connected to the lower side of the hydraulic cylinder 3, the pressure-compensating assembly 10 is connected to the front side of the mounting platform 9, and the roller 11 is connected to the front side of the pressure-compensating assembly 10. Under the action of the hydraulic cylinder 3, the pressure-compensating assembly 10 drives the roller 11 to fit on the surface of the test wheel 6. When the test wheel 6 rotates, the transmission assembly 7 drives the pressure member 8 to periodically contact the mounting platform 9. When the pressure member 8 contacts the mounting platform 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-compensating assembly 10 compensates for the difference in the axis of the roller 11 to the axis of the test wheel 6 caused by the movement of the axis 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 platform 9, and applies a certain pressure to the test wheel 6 to simulate the situation that the roller 11 is at 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 component 7. When the transmission component 7 drives the pressure member 8 to move, the pressure member 8 contacts the mounting platform 9 and squeezes the mounting platform 9. At this time, the controller 5 controls the hydraulic cylinder 3 to increase the power output to simulate the pressure situation when the escalator is at the front and there are pedestrians standing. With the movement of the pressure member 8, the mounting platform 9 drives the roller 11 to move to the left. At this time, the position of the test wheel 6 remains unchanged, and the roller 11 and the test wheel 6 are displaced, and then the contact position of the roller 11 and the test wheel 6 changes, thereby realizing the simulation of the roller 11 being on the inclined track of the escalator. By simulating the horizontal movement and the inclined movement under the pressure environment respectively, the accuracy of the fatigue detection of the roller 11 is effectively improved.

[0041] As an embodiment of the present invention, refer to Figure 3 , Figure 4 , Figure 5 and Figure 8The 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 circumference of the power output shaft of the motor 4. When the motor 4 drives the test wheel 6 to rotate, the main gear 701 will be driven 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 wheel 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 of the sub-gear 7 02 rotates one circle, the chain 704 is meshed with the sub-gear 702, and when the sub-gear 702 rotates, the chain 704 can be driven to move on the surface of the transmission wheel 703. The diameter value of the test wheel 6 is greater than the diameter value of the roller 11. The pressure member 8 includes an adjustment bar 801, a transition bar 802 and a pressure bar 803. The adjustment bar 801, the transition bar 802 and the pressure bar 803 are all connected to the outer peripheral surface of the chain 704. The transition bar 802 is located at both ends of the pressure bar 803. The adjustment bar 801 is located at one end of the two transition bars 802 away from the pressure bar 803. The thickness value of the adjustment bar 801 is less than the thickness value of the pressure bar 803. The side of the transition bar 802 away from the chain 704 is provided with an arc surface. The adjustment bar 801 passes through the transition bar The arc surface of 802 can transition to the pressure bar 803. When the pressure piece 8 is unfolded, the length values ​​at both ends of the pressure piece 8 are less 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 less than the length of the non-working area. By adjusting the length value of the pressure piece 8, the actual use of the roller 11 can be simulated, thereby effectively improving the accuracy of fatigue detection of the roller 11. The pressure bar 803 includes a fixed block 8031 ​​and a pressure block 8032. The fixed block 8031 ​​and the pressure block 8032 are both connected to the outer peripheral surface of the chain 704. A plurality of the fixed blocks 8031 ​​and the pressure blocks 8032 are connected end to end, and both ends of the pressure bar 803 are pressure blocks 8032. 032 is trapezoidal, and the smaller end of the pressure block 8032 faces the chain 704, so that when the pressure block 8032 contacts the mounting platform 9, the extrusion force generated by the mounting platform 9 is borne by the pressure block 8032. On the one hand, the force acts vertically on the chain 704, and on the other hand, the pressure block 8032 disperses the force on the fixed block 8031 ​​through the trapezoidal surface, thereby realizing the force transmission to the chain 704 at the fixed block 8031. By bearing part of the pressure on the chain 704 at the fixed block 8031 ​​adjacent to the pressure block 8032, the force-bearing area of ​​the chain 704 is effectively increased when the mounting platform 9 contacts the pressure block 8032, thereby improving the stability of the chain 704 operation, making it easy to carry out a single long-term test. Through a single long-term test,Effectively improve the detection accuracy.

[0042] By setting up a motor 4, the motor 4 drives the test wheel 6 to rotate, and the test wheel 6 drives the roller 11 to rotate, so as to detect 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, and 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 pressure member 8 to move, and the pressure member 8 moves to squeeze the mounting platform 9, thereby causing the mounting platform 9 to move laterally. The lateral movement of the mounting platform 9 adjusts the contact between the test wheel 6 and the roller 11, so that the pressure point of the roller 11 is offset from the bottom, simulating the change of the contact point between the roller 11 and the slideway when the roller 11 in the working area is in the ascending or descending stage during the operation of the escalator, thereby improving the detection accuracy.

[0043] As an embodiment of the present invention, refer to Figure 6 , Figure 7 and Figure 8The mounting platform 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 surface 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 groove 9054, a slider 9055, a push spring 9056, a limit plate 9057 and a control button 9058. The positioning The plate 9051 is connected to the left side of the front end surface 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 with the positioning plate 9051, the 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 in the 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 is pressed, so that the slider 9055 slides to the side of the guide rod 9053, the limit plate 9057 9053 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, and then 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, because the guide rod 9053 passes through the movable plate 904 and is adapted to be engaged with the guide groove 9052, the guide rod 9053 is separated from the guide groove 9052 when moving forward, the control button 9058 is connected to the right side of the positioning plate 9051, and the right side of the control button 9058 is arc-shaped. In the initial state (the initial state refers to when the pressure member 8 is not in contact with the mounting table 9), the control button 9058 pops out of the positioning plate 9051. On the right side, 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 pressure member 8 to rotate, the adjustment bar 801 will first contact the control button 9058, so that the control button 9058 shrinks into the positioning plate 9051, and the hydraulic cylinder 3 will increase the pressure applied to the roller 11, thereby realizing the state simulation of the horizontal movement of the working area of ​​the escalator roller 11. As the chain 704 moves, the control button 9058 moves to the pressure bar 803 on the adjustment bar 801 through the transition bar 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 down 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 up the mounting platform 9, the mounting platform 9 follows the power output of the hydraulic cylinder 3 to drive the roller 11 to fit with the test wheel 6, and when the pressure piece 8 contacts the mounting platform 9, the output strength of the hydraulic cylinder 3 on the roller 11 is changed, and by controlling the contact length of the pressure piece 8 and the mounting platform 9, the length ratio of the working area and the non-working area of ​​the simulated escalator is achieved, thereby improving the detection accuracy of the fatigue of the roller 11. At the same time, the pressure piece 8 can drive the roller 11 to move horizontally through the mounting platform 9, change the contact position of the roller 11 with the test wheel 6, thereby realizing the simulation of the change of the pressure point when the escalator roller 11 rolls on the inclined plane, thereby further improving the detection accuracy of the fatigue of the roller 11.

[0045] The escalator is divided into a working area and a non-working area. In the working area, the roller 11 will be affected by the weight of pedestrians, and in the non-working area, the roller 11 will only be affected by the gravity of the steps. Therefore, the roller 11 will be affected by the alternating changes of high pressure and low pressure during operation. The alternating pressure acts on the roller 11, which will affect the service life of the roller 11. This solution sets the chain 704 and the pressure member 8, and simulates the total running length of the roller 11 in the escalator with the total length of the chain 704, and simulates the length of the working area of ​​the roller 11 in the escalator with the total length of the pressure member 8, thereby restoring the compressed and non-compressed use of the escalator step chain roller 11 during operation, thereby improving the accuracy of fatigue detection of the roller 11. The specific method is as follows:

[0046] The roller 11 is mounted on the swing arm 1001. At this time, the axis of the roller 11 and the axis of the test wheel 6 are in the same vertical plane of the horizontal plane. The hydraulic cylinder 3 drives the roller 11 downward through the mounting platform 9 to contact the test wheel 6 and apply pressure. At this time, the contact pressure between the roller 11 and the test wheel 6 is the pressure applied to the roller 11 by the non-working area of ​​the escalator. The motor 4 drives the test wheel 6 to rotate. The friction between the test wheel 6 and the roller 11 will drive the roller 11 to rotate, thereby simulating the scene when the roller 11 rolls in the slideway when the escalator is running. 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 sub-gear 702. The chain 704 rotates one circle for the roller 11 to rotate. After the wheel 11 moves one circle in the escalator, as the chain 704 moves, the chain 704 will drive the pressure member 8 to contact the control button 9058 of the mounting platform 9, and the control button 9058 will pressurize the hydraulic cylinder 3. The pressure applied by the hydraulic cylinder 3 acts on the roller 11, thereby simulating the scene that the roller 11 is in the working area when the escalator is running. As the chain 704 moves, the pressure member 8 separates from the mounting platform 9, and the control button 9058 pops out at this time. The hydraulic cylinder 3 reduces the pressure on the roller 11, thereby simulating the scene that the roller 11 is in the non-working area when the escalator is running. Through the operation of the pressure 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, in the straight section, the pressure point of the roller 11 is located directly below the roller 11, and 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 easy to affect the service life of the roller 11. The present invention provides a mounting platform 9. When the adjusting bar 801 contacts the mounting platform 9, it will squeeze the mounting platform 9, so that the mounting platform 9 moves laterally, 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, thereby improving the accuracy of fatigue detection of the roller 11. Specifically, when the adjusting bar 801 moves, the transition bar 802 will fit with the inclined surface of the positioning plate 9051, thereby generating pressure on the slider 9055. The slider 9055 squeezes the inclined surface of the limiting plate 9057 to make the guide rod 9053 move out of the guide groove 9052. At this time, the limit on the movable plate 904 is released, and the transition bar 802 is pressed against the inclined surface of the positioning plate 9051. Further movement of 802 will cause the positioning plate 9051 to move onto the pressure strip 803, thereby pushing the movable plate 904 to move horizontally. 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 realizing the scene of simulating 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 setting the limit strip 1003, the swing arm 1001 will contact the limit strip 1003 when moving horizontally. The arc surface of the limit strip 1003 will cause the left side of the swing arm 1001 to deflect downward. 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] When the escalator roller 11 is in the working area, pedestrians walking on the escalator will cause periodic changes in the pressure on the roller 11 again, thereby affecting the service life of the roller 11. In order to detect this situation, this solution sets a pressure strip 803 with a variable height. When the control button 9058 contacts the pressure 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, thereby simulating the pressure on the roller 11 when pedestrians walk on the escalator. Specifically, the positioning plate 9051 drives the control button 9058 to slide on the surface of the pressure strip 803. When the pressure piece 8 moves, the control button 9058 will contact the pressure block 8032, and the pressure block 8032 will shrink the control button 9058 in the positioning plate 9051. As the pressure piece 8 moves, the control button 9058 moves to the fixed block 8031. Since the thickness 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. By alternately setting the fixed block 8031 ​​and the pressure block 8032, the alternating change of pressure when a pedestrian walks on the escalator is simulated, thereby effectively improving the accuracy of the fatigue detection of the roller 11.

[0049] When the pressure member 8 is separated from the mounting platform 9, the control button 9058 pops out. At this time, the pressure of the hydraulic cylinder 3 on the roller 11 is reduced, and the spring 903 drives the movable plate 904 to reset, so that the roller 11 is reset. The periodic rotation of the pressure member 8 simulates the operation of the elevator, thereby achieving the purpose of improving the accuracy of fatigue detection of the roller 11.

[0050] Although the embodiments of the present invention have been described, it will be apparent to those skilled in the art that changes and modifications may be made to the embodiments to obtain other effects with an understanding of the principles and spirit of the present invention. 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), wherein 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), characterized in that: The hydraulic cylinder (3) further comprises a test wheel (6), a transmission assembly (7), a pressure member (8), a mounting platform (9), a pressure compensation assembly (10) and a roller (11), wherein the test wheel (6) is connected to the end of 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 pressure member (8) is connected to the outer side of the transmission assembly (7), the mounting platform (9) is connected to the lower side of the hydraulic cylinder (3), the pressure compensation assembly (10) is connected to the front side of the mounting platform (9), and the roller (11) is connected to the front side of the pressure compensation assembly (10). The pressure-compensating 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 pressure-applying member (8) to periodically contact the mounting platform (9). When the pressure-applying member (8) contacts the mounting platform (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-compensating assembly (10) compensates for the difference between the axis of the roller (11) and the axis of the test wheel (6) caused by the movement of the axis of the roller (11).

2. A step chain roller fatigue testing machine according to claim 1, characterized in that: The transmission assembly (7) comprises 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 meshedly connected to the lower side of the main gear (701) and is rotationally 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 of the main gear (701) is smaller than the diameter of the sub-gear (702); and the chain (704) is meshed with the sub-gear (702).

3. A step chain roller fatigue testing machine according to claim 2, characterized in that: The pressure member (8) comprises an adjustment bar (801), a transition bar (802) and a pressure bar (803); the adjustment bar (801), the transition bar (802) and the pressure bar (803) are all connected to the outer peripheral surface of the chain (704); the transition bar (802) is located at both ends of the pressure bar (803); the adjustment bar (801) is located at one end of the two transition bars (802) away from the pressure bar (803); and the length of the pressure member (8) is less than half of the length of the chain (704).

4. A step chain roller fatigue testing machine according to claim 3, characterized in that: The pressure bar (803) includes a fixed block (8031) and a pressure block (8032), and the fixed block (8031) and the pressure block (8032) are both connected to the outer peripheral surface of the chain (704). A plurality of the fixed blocks (8031) and the pressure blocks (8032) are connected end to end. The pressure block (8032) is trapezoidal in shape, and the smaller end of the pressure block (8032) faces the chain (704). Both ends of the pressure block (8032) away from the chain (704) are chamfered, and the thickness of the fixed block (8031) is smaller than the thickness of the pressure block (8032).

5. A step chain roller fatigue testing machine according to claim 4, characterized in that: The mounting platform (9) comprises 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 surface of the fixed plate (901); 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 locking member (905) is connected to the left end of the front side of the movable plate (904); and a curved surface is provided on the side of the transition bar (802) away from the chain (704).

6. A step chain roller fatigue testing machine according to claim 5, characterized in that: The locking member (905) comprises a positioning plate (9051), a guide groove (9052), a guide rod (9053), a clamping groove (9054), a slider (9055), a push spring (9056), a limit plate (9057) and a control button (9058), wherein the positioning plate (9051) is connected to the left side of the front end surface of the movable plate (904), the guide groove (9052) is provided on the front side of the fixed plate (901), the guide rod (9053) is connected to the upper side of the interior of the positioning plate (9051), the clamping groove (9054) is provided on the front side of the guide rod (9053), and ... and the guide rod (9053) is connected to the upper side of the interior of the positioning plate (9051). The right side of the top of the positioning plate (9051) is inclined, the slider (9055) is connected to the 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 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, and the slider (9055) contacts the inclined surface of the limit plate (9057) when it moves.

7. A step chain roller fatigue testing machine according to claim 6, characterized in that: The guide rod (9053) passes through the movable plate (904) and is adapted to be engaged 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) forward through the limiting plate (9057).

8. A step chain roller fatigue testing machine according to claim 7, characterized in that: The distance value between the upper and lower sides of the right end surface of the positioning plate (9051) is h, and the distance value between the two pressure blocks (8032) is g, and h is greater than g.

9. A step chain roller fatigue testing machine according to claim 8, characterized in that: The pressure compensation assembly (10) comprises a swing arm (1001), a transverse 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 transverse plate (1002) is connected to the front side of the fixed plate (901); the limit bar (1003) is connected to the lower side of the transverse plate (1002); the roller (11) is connected to the left end of the swing arm (1001); 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.

10. The step chain roller fatigue testing machine according to claim 6, characterized in that: The lower end surface of the limiting strip (1003) is arc-shaped, and the arc-shaped surface of the limiting strip (1003) is sprayed with a wear-resistant coating.

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