Device and method for eliminating vibration of escalator driving chain

Abstract

The invention provides a device and method for eliminating vibration of a drive chain of an escalator, the device is used for being arranged on the escalator, the escalator comprises a drive main machine, a drive main shaft and the drive chain wound on the drive main machine and the drive main shaft, and the device comprises a vibration sensor arranged on the escalator, the vibration sensor is used for collecting vibration data during operation of the escalator; the frequency converter is electrically connected with the driving host and used for controlling the rotating speed of the driving host; the tensioning module is arranged on one side of the driving chain and used for tensioning the driving chain; the pressure sensor is arranged on the tensioning module and used for measuring the pressure between the tensioning module and the driving chain; the moving module is connected with the driving host and used for moving the driving host; and the controller is electrically connected with the vibration sensor, the frequency converter, the tensioning module, the pressure sensor and the moving module. Vibration of the driving chain can be automatically eliminated, so that vibration of the escalator is eliminated, the escalator does not need to be stopped for maintenance, and the maintenance cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of escalators, and in particular relates to a device and a method for eliminating vibration of an escalator driving chain. Background Art

[0002] The escalator in the rail transit application scenario has complex working conditions and has different adjustable operating speeds according to operational needs. Under different passenger flow rates, the load rate of the escalator may range from 0% to 100%, and the operating speeds are 0m / s, 0.13m / s, 0.5m / s and 0.65m / s depending on the load rate. When the escalator is stationary or at a low speed (0.13m / s), it is in the no-load and maintenance states respectively. These working conditions put forward different requirements on the escalator's drive system, and the transmission characteristics of the drive chain are also different.

[0003] The operation of an escalator is generally driven by the main drive unit through the drive chain to drive the main shaft to rotate, and then the main shaft drives the escalator steps to run. In actual applications, under certain specific working conditions, abnormal vibrations may occur during the transmission of the drive chain, causing instability in the escalator operation and accelerating the loss of the drive chain. At present, when the drive chain has abnormal vibrations and causes the escalator to vibrate, it will not be discovered until the passengers have reported back, and then the escalator will be stopped for maintenance. If necessary, the chain needs to be replaced, which takes a long time and is difficult to maintain. Summary of the invention

[0004] The object of the present invention is to provide a device and method for eliminating the vibration of an escalator drive chain, which can automatically eliminate the vibration of the drive chain, thereby eliminating the vibration of the escalator, without stopping the escalator for maintenance, thereby reducing maintenance costs.

[0005] The present invention is achieved through the following technical solutions:

[0006] A device for eliminating vibration of an escalator driving chain is used to be arranged on an escalator. The escalator comprises a driving main unit, a driving main shaft, and a driving chain wound around the driving main unit and the driving main shaft. The device comprises:

[0007] A vibration sensor is provided on the escalator to collect vibration data when the escalator is in operation;

[0008] A frequency converter, which is electrically connected to the driving host and is used to control the speed of the driving host;

[0009] A tensioning module, which is arranged on one side of the driving chain and is used to tension the driving chain;

[0010] A pressure sensor is arranged on the tensioning module and is used to measure the pressure between the tensioning module and the driving chain;

[0011] A moving module, the moving module is connected to the driving host and is used to move the driving host;

[0012] The controller is electrically connected to the vibration sensor, the frequency converter, the tensioning module, the pressure sensor and the moving module respectively.

[0013] Furthermore, the tensioning module comprises a telescopic mechanism, and a tensioning sprocket engaged with the driving chain is provided on the telescopic end of the telescopic mechanism.

[0014] Furthermore, the number of the telescopic mechanisms is set to two, and the two telescopic mechanisms are respectively arranged on both sides of the driving main shaft.

[0015] Furthermore, the moving module includes a vertical moving mechanism and a horizontal moving mechanism. The horizontal moving mechanism is arranged at the bottom of the driving host and is used to drive the driving host to move horizontally to approach or move away from the driving main shaft. The vertical moving mechanism is arranged at the bottom of the horizontal moving mechanism and is used to drive the horizontal moving mechanism and the driving host to move vertically.

[0016] The present invention also provides a method for eliminating vibration of an escalator drive chain. Using the above-mentioned device for eliminating vibration of an escalator drive chain, the method comprises the following steps:

[0017] S1. Obtaining vibration data of the escalator in real time through a vibration sensor, and obtaining a vibration spectrum according to the vibration data;

[0018] S2. determining whether the escalator is vibrating based on the vibration spectrum;

[0019] S3. If vibration occurs, determine whether the escalator has reached resonance based on the vibration spectrum;

[0020] S4, if resonance is reached, the first preset processing scheme is executed to eliminate the vibration of the escalator, and if resonance is not reached, the second preset processing scheme is executed to eliminate the vibration of the drive chain;

[0021] The steps of the first preset processing scheme include:

[0022] S41, determining and adjusting the rotation speed;

[0023] S42, determining whether the deviation between the actual running speed of the escalator and the nominal speed is less than a first threshold after the speed of the driving host is reduced and adjusted, if so, executing step S43, if not, executing step S45;

[0024] S43, controlling the speed of the driving host to reduce and adjust the speed through the frequency converter, and obtaining the vibration data of the escalator through the vibration sensor, and judging whether the vibration of the escalator is less than the preset vibration value based on the vibration data, if so, controlling the driving host to run at the reduced speed, if not, executing step S44;

[0025] S44, repeating step S41 to step S42;

[0026] S45, gradually raising or lowering the driving host through the moving mechanism, and in the process of raising or lowering the driving host, horizontally moving the driving host through the moving mechanism or tensioning the driving chain through the tensioning mechanism, so that the pressure between the tensioning module and the driving chain is maintained within a preset pressure range;

[0027] The steps of the second preset treatment plan include:

[0028] S46. Gradually tighten the drive chain through the tensioning mechanism until the vibration of the escalator is less than a preset vibration value.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows: the vibration of the escalator is monitored by a vibration sensor without the need for passenger feedback, and the drive chain can be tensioned by a tensioning module to increase the wrap angle between the drive chain and the drive main sprocket, and the length of the tight side of the drive chain can be changed, so as to increase the chain wrap angle on the drive main sprocket and improve the stability of the chain drive, or the rotation speed of the drive main unit can be controlled by a frequency converter to adjust the tension of the drive chain, or the horizontal and vertical positions of the drive main unit can be adjusted by a mobile module, and the horizontal position adjustment is used to tension the drive chain at all times to reduce the vibration amplitude and frequency during drive chain transmission, thereby reducing the chain loss, and the vertical position adjustment changes the angle between the tight side of the chain and the horizontal line or the transmission center line, thereby avoiding the frequency of engagement between the drive chain and the drive main sprocket, and realizing automatic elimination of the vibration of the drive chain, thereby eliminating the vibration of the escalator, without stopping the escalator for maintenance, and reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the device for eliminating escalator drive chain vibration according to the present invention installed on an escalator;

[0031] Figure 2 The schematic diagram of the structure of the device for eliminating the vibration of the escalator drive chain of the present invention;

[0032] Figure 3 A schematic diagram of the device for eliminating vibration of an escalator driving chain according to the present invention tensioning the chain through a tensioning module;

[0033] Figure 4 This is a schematic diagram of the device for eliminating escalator drive chain vibration according to the present invention moving the drive main unit through the moving module.

[0034] In the figure, 1-escalator, 11-driving main engine, 12-driving main shaft, 13-driving chain, 14-truss, 15-driving sprocket, 2-vibration sensor, 3-inverter, 4-tensioning module, 41-telescopic mechanism, 42-tensioning sprocket, 5-moving module, 51-horizontal moving mechanism, 52-vertical moving mechanism, 6-controller. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0038] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0039] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0040] See also Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the device for eliminating escalator drive chain vibration according to the present invention installed on an escalator. Figure 2 The present invention is a schematic diagram of the structure of a device for eliminating vibration of an escalator drive chain. A device for eliminating vibration of an escalator drive chain is used to be arranged on an escalator 1. The escalator 1 includes a driving host 11, a driving spindle 12, and a driving chain 13 wound around the driving host 11 and the driving spindle 12. The device includes a vibration sensor 2, a frequency converter 3, a tensioning module 4, a pressure sensor, a moving module 5 and a controller 6. The vibration sensor 2 is arranged on the escalator 1 and is used to collect vibration data when the escalator 1 is running. The frequency converter 3 is electrically connected to the driving host 11 and is used to control the rotation speed of the driving host 11. The tensioning module 4 is arranged on one side of the driving chain 13 and is used to tension the driving chain 13. The pressure sensor is arranged on the tensioning module 4 and is used to measure the pressure between the tensioning module 4 and the driving chain 13. The moving module 5 is connected to the driving host 11 and is used to move the driving host 11. The controller 6 is electrically connected to the vibration sensor 2, the frequency converter 3, the tensioning module 4, the pressure sensor and the moving module 5 respectively.

[0041] The abnormal vibration phenomenon occurs during the operation of the escalator 1. The root cause comes from the vibration occurring during the transmission of the drive chain 13. There are two main reasons for the violent vibration of the drive chain 13: first, the wear of the rollers, chain plates or pins during the use of the drive chain 13 will cause fatigue elongation of the drive chain 13. If the drive chain 13 is not tensioned in time, it is easy to cause the drive chain 13 to vibrate, and even cause tooth skipping when meshing with the drive sprocket 15 on the drive host 11, thereby causing the drive chain 13 to vibrate; second, when the vibration frequency of the drive chain 13 of the escalator 1 is exactly the same as the meshing frequency of the drive sprocket 15 at a specific load rate and operating speed, resonance will occur. The resonance will aggravate the vibration amplitude of the drive chain 13, thereby causing instability in the escalator operation and accelerating the loss of the drive chain 13.

[0042] Furthermore, the natural frequency calculation formula of the drive chain 13 is: Among them, f nis the natural frequency of the drive chain 13, L is the length of the tight side of the drive chain 13, F is the tension of the drive chain 13, g is the acceleration of gravity, G is the weight of the chain per unit length, α is the angle between the transmission centerline and the horizontal plane, and β is the angle between the tight side and the centerline of the drive chain 13. It can be seen that the natural frequency f of the drive chain 13 is affected by n The factors include the tension F of the driving chain 13, the length L of the tight side of the driving chain 13, and the difference α-β between the angle between the transmission centerline and the horizontal plane and the angle between the tight side of the driving chain 13 and the transmission centerline. Therefore, according to the causes of the vibration of the driving chain 13 and the factors affecting the natural frequency of the driving chain 13, the device for eliminating the vibration of the escalator driving chain of the present invention determines three solutions for eliminating the vibration of the escalator 1:

[0043] The first solution is that the controller 6 outputs a signal to the frequency converter 3, and the frequency converter 3 outputs a frequency signal to control the rotation speed of the drive host 11, thereby adjusting the tension of the drive chain 13 to avoid the frequency of the sprocket meshing. Specifically, the controller 6 outputs a control signal to the frequency converter 3, and the frequency converter 3 outputs a frequency signal to the drive host 11, which is converted into a magnetic field with different alternating frequencies to control the rotation speed of the drive host 11. According to the torque calculation formula output by the drive host 11 It can be seen that when the power remains unchanged, the speed n of the driving host 11 is proportional to the output torque T. Reducing the speed of the driving host 11 can reduce the output torque, thereby reducing the tension F of the drive chain 13. Then, the vibration sensor 2 monitors the vibration amplitude of the escalator 1 in real time after reducing the tension of the drive chain 13. If the escalator 1 still vibrates, the speed of the driving host 11 is further reduced to form a closed-loop control. When the vibration phenomenon of the escalator 1 is eliminated, it runs at the speed of the driving host 11 at that time.

[0044] Please refer to Figure 3 , Figure 3 The schematic diagram of the device for eliminating the vibration of the escalator drive chain of the present invention is to tension the chain through the tensioning module. The second scheme is that the controller 6 controls the tensioning module 4 to tension the drive chain 13, increase the wrap angle of the drive chain 13 wrapped around the drive sprocket 15, change the tight side length of the drive chain 13, avoid the sprocket meshing frequency, and increase the chain wrap angle θ of the drive sprocket 15, such as Figure 3As shown, the stability of the chain drive is improved; during the tensioning process, the pressure between the tensioning module 4 and the drive chain 13 can be monitored by the pressure sensor to avoid a large pressing force on the drive chain 13. Specifically, the controller 6 controls the tensioning module 4 to gradually press the drive chain 13. When the vibration sensor 2 detects that the vibration amplitude of the escalator 1 is reduced to a preset vibration value that does not affect the passengers' riding experience, the controller 6 stops outputting signals to the tensioning module 4. If the pressing force of the drive chain 13 is large during the tensioning process, the mobile host can be horizontally moved toward the direction close to the drive main shaft 12 by the moving module 5, so that the tension of the drive chain 13 remains unchanged, and finally the chain wrap angle θ on the drive sprocket 15 of the drive host 11 is increased. The chain wrap angle θ is appropriately increased, and the stability of the drive chain 13 transmission can be improved. In one embodiment, the tensioning module 4 includes a telescopic mechanism 41, and a tensioning sprocket 42 meshing with the drive chain 13 is provided on the telescopic end of the telescopic mechanism 41. The tensioning sprocket 42 gradually compresses the drive chain 13 by extending the telescopic mechanism 41 to tension the drive chain 13. While gradually compressing the drive chain 13, the wrap angle θ of the drive chain 13 wrapping the sprocket of the drive main unit 11 can also be increased, and the length of the tight side of the drive chain 13 can be changed. In order to increase the wrap angle of the drive chain 13 wrapping the sprocket of the drive main unit 11 as much as possible, in one embodiment, the number of telescopic mechanisms 41 is set to two, and the two telescopic mechanisms 41 are respectively arranged on both sides of the drive main shaft 12. Two telescopic mechanisms 41 are used, and the two telescopic mechanisms 41 are located on the outside of the drive chain 13, and the drive chain 13 is tensioned together, so that the drive chains 13 on both sides of the sprocket of the drive main unit 11 wrap the sprocket of the drive main unit 11 together, thereby further increasing the wrap angle θ of the drive chain 13 wrapping the sprocket of the drive main unit 11. The telescopic mechanism 41 can adopt an existing telescopic mechanism 41, such as a cylinder.

[0045] Please refer to Figure 4 , Figure 4 The schematic diagram of the device for eliminating the vibration of the escalator drive chain of the present invention is to move the drive main unit through the mobile module. The third scheme is that the controller 6 controls the mobile module 5 to move the drive main unit 11, so as to adjust the horizontal position and vertical position of the drive sprocket 15 on the drive main unit 11. By adjusting the horizontal position of the drive sprocket 15, it is used to tension the drive chain 13 at all times, reduce the vibration amplitude and frequency of the drive chain 13 during transmission, and thus reduce the loss of the drive chain 13. By adjusting the vertical position of the drive sprocket 15, it is used to change the angle between the tight side of the chain and the horizontal line or the transmission center line, which also has the effect of avoiding the sprocket meshing resonance frequency. Specifically, when the controller 6 controls the mobile module 5 to raise or lower the height of the drive main unit 11, the drive chain 13 is raised or lowered as the drive main unit 11 is raised or lowered, and the angle α between the transmission center line and the horizontal plane also increases or decreases as the drive chain 13 is raised or lowered, while the angle β between the tight side of the drive chain 13 and the transmission center line remains unchanged, such as Figure 4 As shown. Therefore, the difference change of α-β also affects the natural frequency of the drive chain 13. In the process of raising or lowering the drive host 11, the drive chain 13 may be too loose or too tight. According to the pressing force of the drive chain 13 fed back by the pressure sensor, when the drive chain 13 is too loose, the controller 6 moves the drive host 11 horizontally away from the drive spindle 12 through the moving module 5 to tighten the drive chain 13; when the drive chain 13 is too tight, the controller 6 moves the drive host 11 horizontally toward the drive spindle 12 through the moving module 5 to loosen the drive chain 13, so that the pressing force of the drive chain 13 remains within the preset pressure range. In one embodiment, the moving module 5 includes a vertical moving mechanism 52 and a horizontal moving mechanism 51. The horizontal moving mechanism 51 is arranged at the bottom of the drive host 11, and is used to drive the drive host 11 to move horizontally to approach or move away from the drive spindle 12. The vertical moving mechanism 52 is arranged at the bottom of the horizontal moving mechanism 51, and is used to drive the horizontal moving mechanism 51 and the drive host 11 to move vertically. The vertical moving mechanism 52 and the horizontal moving mechanism 51 can adopt existing moving mechanisms, such as a motor-driven screw mechanism, a lifting mechanism, and a belt transmission mechanism, etc., which are not limited here.

[0046] The above three schemes can be selected according to the actual situation of the vibration of the escalator 1. The device for eliminating the vibration of the escalator drive chain 13 of the present invention installs the vibration sensor 2 on the truss 14 of the escalator 1, and collects in real time the vibration data transmitted from the driving component to the truss 14 when the escalator 1 is running. The vibration data includes the vibration frequency and the vibration amplitude, so that the controller 6 can draw a vibration spectrum according to the vibration data collected by the vibration sensor 2, and judge based on the vibration spectrum whether the vibration of the escalator 1 is caused by the chain not being tensioned or the resonant vibration caused by the coincidence of the vibration frequency of the drive chain 13 and the sprocket meshing frequency. If the vibration of the escalator 1 is caused by the untensioned driving chain 13, the second solution is adopted to gradually tighten the driving chain 13 through the tensioning module 4 to eliminate the vibration of the escalator 1; if it is a resonant vibration, the quickest way is to adopt the first solution to adjust the tension of the driving chain 13 to avoid the resonant frequency, but if during the process of adjusting the tension of the driving chain 13, continuing to adjust the tension of the driving chain 13 will result in the actual operating speed of the escalator 1 exceeding the nominal speed deviation range of 5% after reducing the rotation speed of the driving main unit 11, then the third solution is adopted to move the driving main unit 11 through the moving module 5, adjust the angle α between the transmission center line and the horizontal plane and the angle β between the tight side of the driving chain 13 and the transmission center line to avoid the resonant frequency, thereby eliminating the vibration of the escalator 1.

[0047] The present invention also provides a method for eliminating vibration of an escalator drive chain. Using the above-mentioned device for eliminating vibration of an escalator drive chain, the method comprises the following steps:

[0048] S1, obtaining vibration data of the escalator 1 in real time through the vibration sensor 2, and obtaining a vibration spectrum according to the vibration data;

[0049] S2. determining whether the escalator 1 is vibrating based on the vibration spectrum;

[0050] S3. If vibration occurs, determine whether the escalator 1 reaches resonance based on the vibration spectrum;

[0051] S4, if resonance is reached, the first preset processing scheme is executed to eliminate the vibration of the escalator 1, and if resonance is not reached, the second preset processing scheme is executed to eliminate the vibration of the drive chain 13;

[0052] The steps of the first preset processing scheme include:

[0053] S41, determining and adjusting the rotation speed;

[0054] S42, determining whether the deviation between the actual running speed of the escalator 1 and the nominal speed is less than a first threshold after the speed of the driving host 11 is reduced and adjusted, if so, executing step S43, if not, executing step S45;

[0055] S43, controlling the speed of the driving host 11 to reduce and adjust the speed through the frequency converter 3, and obtaining the vibration data of the escalator 1 through the vibration sensor 2, and judging whether the vibration of the escalator 1 is less than the preset vibration value based on the vibration data, if so, controlling the driving host 11 to run at the reduced speed, if not, executing step S44;

[0056] S44, repeating step S41 to step S42;

[0057] S45, gradually raising or lowering the driving host 11 by the moving mechanism, and in the process of raising or lowering the driving host 11, horizontally moving the driving host 11 by the moving mechanism or tensioning the driving chain 13 by the tensioning mechanism, so that the pressure between the tensioning module 4 and the driving chain 13 is maintained within a preset pressure range;

[0058] The steps of the second preset treatment plan include:

[0059] S46. Gradually tighten the drive chain 13 through the tensioning mechanism until the vibration of the escalator 1 is less than a preset vibration value.

[0060] In the above step S1, the vibration sensor 2 is installed on the truss 14 of the escalator 1, and collects in real time the vibration data transmitted from the driving component to the truss 14 when the escalator 1 is running, and transmits it to the controller 6, so that the controller 6 can draw a vibration spectrum according to the vibration data collected by the vibration sensor 2. The vibration data includes vibration frequency and vibration amplitude, and the vibration spectrum is a curve of speed changing with frequency.

[0061] In the above step S2 , if the speed at a certain frequency in the vibration spectrum fluctuates, it means that the escalator 1 is vibrating, and the escalator 1 needs to be processed to eliminate the vibration of the escalator 1 .

[0062] In the above step S3, since the vibration of the escalator 1 may be caused by the wear of the rollers, chain plates or pins during the use of the drive chain 13, which may lead to the fatigue elongation of the drive chain 13, it is easy to cause the drive chain 13 to vibrate when the drive chain 13 is not tensioned in time, and even the situation of tooth skipping occurs when the drive chain 13 is engaged with the drive sprocket 15 on the drive host 11, thereby causing the drive chain 13 to vibrate, or the vibration frequency of the drive chain 13 of the escalator 1 is just consistent with the frequency of the engagement of the drive sprocket 15 at a specific load rate and running speed, a resonance phenomenon will occur, and the resonance will aggravate the vibration amplitude of the drive chain 13, thereby causing the vibration of the escalator 1. If the speed at a certain frequency in the vibration spectrum is greater than the preset speed, it means that the frequency is the resonance frequency, and it can be judged that the escalator 1 reaches resonance. It means that the vibration of the escalator 1 is due to the vibration caused by the resonance phenomenon.

[0063] In the above step S4, if the vibration of the escalator 1 is caused by resonance due to the vibration frequency of the drive chain 13 being exactly the same as the frequency of the engagement of the drive sprocket 15, the first preset processing scheme is executed to eliminate the vibration of the escalator 1; if the vibration of the escalator 1 is caused by fatigue elongation of the drive chain 13 and failure to tighten the drive chain 13 in time, the second preset processing scheme is executed to eliminate the vibration of the escalator 1.

[0064] In the above step S41, the adjustment speed △n can be determined according to the actual situation, such as the adjustment speed △n can be pre-set to a fixed value, or in order to eliminate the resonance as soon as possible, it is determined by the difference between the chain natural frequency fn and the sprocket meshing frequency. Specifically, if the difference between the chain natural frequency fn and the sprocket meshing frequency is larger, it means that the resonance is less likely to occur, and the adjustment speed △n is reduced. If the difference between the chain natural frequency fn and the sprocket meshing frequency is smaller, it means that the resonance is more likely to occur, and the adjustment speed △n is increased. Among them, the sprocket meshing frequency is calculated from the speed of the drive sprocket 15 on the drive main unit 11 according to the escalator running speed at this time, and the number of teeth meshing per second is calculated according to the number of teeth of the drive sprocket 15.

[0065] In the above step S42, when the escalator 1 is running, it has a nominal speed according to different working conditions, and the deviation between the actual running speed of the escalator 1 and the nominal speed cannot exceed a preset first threshold value, which is generally 5%. Therefore, in the process of eliminating the vibration of the escalator 1, if the deviation between the actual running speed of the escalator 1 and the nominal speed is greater than or equal to the first threshold value after the speed of the driving host 11 is reduced and adjusted, the resonance situation cannot be avoided by reducing the speed of the driving host 11. At this time, step S45 needs to be executed, that is, the third solution is executed. If the deviation between the actual running speed of the escalator 1 and the nominal speed is less than the first threshold value after the speed of the driving host 11 is reduced and adjusted, the resonance situation can be avoided by reducing the speed of the driving host 11. At this time, step S43 is executed, that is, the first solution is executed.

[0066] In the above steps S43 and S44, the controller 6 outputs a control signal to the frequency converter 3, and the frequency converter 3 outputs a frequency signal to the drive host 11, which is converted into a magnetic field with different alternating frequencies, and the rotation speed of the drive host 11 is reduced to adjust the rotation speed, thereby reducing the tension of the drive chain 13, and then the vibration sensor 2 monitors the vibration amplitude of the escalator 1 after reducing the tension of the drive chain 13 in real time. If the vibration of the escalator 1 is less than the preset vibration value, it means that the vibration of the escalator 1 has been eliminated at this time, and the drive host 11 is controlled to continue to run at the current speed of the drive host 11. If the vibration of the escalator 1 is greater than or equal to the preset vibration value, it means that the escalator 1 is still vibrating, and steps S41 to S42 are repeated until the vibration of the escalator 1 is eliminated, or the deviation between the actual running speed of the escalator 1 and the nominal speed is greater than or equal to the first threshold.

[0067] In the above step S45, the driving host 11 is gradually raised or lowered by the moving mechanism, and the difference α-β between the angle between the transmission centerline and the horizontal plane and the angle between the tight side of the driving chain 13 and the transmission centerline can be adjusted, so as to avoid the vibration frequency of the driving chain 13 being consistent with the frequency of the engagement of the driving sprocket 15, and eliminate the vibration of the escalator 1. Specifically, when α-β needs to be reduced, the driving host 11 is driven to rise by the moving module 5, and when α-β needs to be increased, the driving host 11 is driven to fall by the moving module 5. In the process of raising or lowering the driving host 11, the driving host 11 is horizontally moved by the moving mechanism or the driving chain 13 is tensioned by the tensioning mechanism, so that the pressure between the tensioning module 4 and the driving chain 13 is maintained within the preset pressure range, and the vibration of the escalator 1 caused by the elongation of the driving chain 13 is avoided.

[0068] In the above step S46, according to the pressure between the tensioning module 4 and the drive chain 13 fed back by the pressure sensor, the drive chain 13 is tightened step by step through the tensioning module 4. When the vibration sensor 2 detects that the vibration of the escalator 1 is less than the preset vibration value, that is, the vibration amplitude of the entire escalator 1 is reduced to a threshold value that does not affect the passengers' riding experience, the controller 6 stops outputting signals to the tensioning module 4 and stops further tightening the drive chain 13.

[0069] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A device for eliminating vibration of an escalator drive chain, which is used to be arranged on an escalator, wherein the escalator comprises a driving main unit, a driving main shaft, and a driving chain wound around the driving main unit and the driving main shaft, characterized in that: The device comprises: A vibration sensor, which is arranged on the escalator and is used to collect vibration data when the escalator is in operation; A frequency converter, the frequency converter is electrically connected to the driving host and is used to control the rotation speed of the driving host; A tensioning module, the tensioning module is arranged on one side of the driving chain and is used to tension the driving chain; A pressure sensor, which is arranged on the tensioning module and is used to measure the pressure between the tensioning module and the driving chain; A moving module, the moving module is connected to the driving host and is used to move the driving host; A controller is electrically connected to the vibration sensor, the frequency converter, the tensioning module, the pressure sensor and the moving module respectively.

2. The device for eliminating escalator drive chain vibration according to claim 1, characterized in that: The tensioning module comprises a telescopic mechanism, and a tensioning sprocket engaged with a driving chain is provided on the telescopic end of the telescopic mechanism.

3. The device for eliminating escalator drive chain vibration according to claim 2, characterized in that: The number of the telescopic mechanisms is set to two, and the two telescopic mechanisms are respectively arranged on both sides of the driving main shaft.

4. The device for eliminating escalator drive chain vibration according to claim 1, characterized in that: The moving module includes a vertical moving mechanism and a horizontal moving mechanism. The horizontal moving mechanism is arranged at the bottom of the driving host and is used to drive the driving host to move horizontally to get closer to or away from the driving main shaft. The vertical moving mechanism is arranged at the bottom of the horizontal moving mechanism and is used to drive the horizontal moving mechanism and the driving host to move vertically.

5. A method for eliminating vibration of an escalator drive chain, using the device for eliminating vibration of an escalator drive chain as claimed in any one of claims 1 to 4, characterized in that: The method comprises the following steps: S1. Acquire vibration data of the escalator in real time through a vibration sensor, and obtain a vibration spectrum according to the vibration data; S2. determining whether the escalator is vibrating based on the vibration spectrum; S3. If vibration occurs, judging whether the escalator reaches resonance according to the vibration spectrum; S4, if resonance is reached, the first preset processing scheme is executed to eliminate the vibration of the escalator, and if resonance is not reached, the second preset processing scheme is executed to eliminate the vibration of the drive chain; The steps of the first preset processing scheme include: S41, determining the adjustment speed; S42, determining whether the deviation between the actual running speed of the escalator and the nominal speed is less than a first threshold after the speed of the driving host is reduced and adjusted, if so, executing step S43, if not, executing step S45; S43, controlling the speed of the driving host to reduce and adjust the speed through the frequency converter, and obtaining the vibration data of the escalator through the vibration sensor, and judging whether the vibration of the escalator is less than the preset vibration value based on the vibration data, if so, controlling the driving host to run at the reduced speed, if not, executing step S44; S44, repeating step S41 to step S42; S45, gradually raising or lowering the driving host by means of a moving mechanism, and in the process of raising or lowering the driving host, horizontally moving the driving host by means of the moving mechanism or tensioning the driving chain by means of a tensioning mechanism, so that the pressure between the tensioning module and the driving chain is maintained within a preset pressure range; The steps of the second preset processing scheme include: S46. Gradually tighten the drive chain through the tensioning mechanism until the vibration of the escalator is less than a preset vibration value.

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