A device and method for eliminating vibration of escalator drive chain

Abstract

The application provides a device and method for eliminating escalator driving chain vibration, wherein the device is arranged on an escalator, the escalator comprises a driving host, a driving main shaft and a driving chain arranged around the driving host and the driving main shaft, and the device comprises: a vibration sensor arranged on the escalator and used for collecting vibration data when the escalator is running; a frequency converter electrically connected with the driving host and used for controlling the rotating speed of the driving host; a tensioning module arranged on one side of the driving chain and used for tensioning the driving chain; a pressure sensor arranged on the tensioning module and used for measuring the pressure between the tensioning module and the driving chain; a moving module connected with the driving host and used for moving the driving host; and a controller electrically connected with the vibration sensor, the frequency converter, the tensioning module, the pressure sensor and the moving module respectively. The application can automatically eliminate the vibration of the driving chain, thereby eliminating the vibration of the escalator, without stopping the escalator for maintenance, and reducing maintenance cost.

Description

Technical Field

[0001] This invention belongs to the field of escalator technology, and particularly relates to a device and method for eliminating vibration of escalator drive chain. Background Technology

[0002] Escalators used in rail transit applications operate under complex conditions and have adjustable speeds depending on operational needs. Under varying passenger volumes, escalator load rates can range from 0% to 100%, with operating speeds of 0 m / s, 0.13 m / s, 0.5 m / s, and 0.65 m / s depending on the load rate. The escalator is stationary or operating at a low speed (0.13 m / s) during no-load and maintenance, respectively. These operating conditions place different demands on the escalator's drive system, resulting in varying transmission characteristics of the drive chain.

[0003] Escalator operation typically involves a drive unit that rotates the drive shaft via a drive chain, which in turn drives the escalator steps. In practical applications, under certain conditions, abnormal vibrations can occur in the drive chain, causing instability in escalator operation and accelerating chain wear. Currently, when abnormal vibrations in the drive chain cause escalator vibrations, it's only discovered after passenger feedback, requiring the escalator to be stopped for inspection and, if necessary, chain replacement. This process is time-consuming and complex. Summary of the Invention

[0004] The purpose of this invention is to provide a device and method for eliminating vibration of the 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, thus reducing maintenance costs.

[0005] This invention is achieved through the following technical solution:

[0006] A device for eliminating vibration of an escalator drive chain is provided for installation on an escalator. The escalator includes a drive unit, a drive shaft, and a drive chain wound around the drive unit and the drive shaft. The device includes:

[0007] Vibration sensors are installed on escalators to collect vibration data during escalator operation.

[0008] A frequency converter is electrically connected to the drive unit and is used to control the speed of the drive unit.

[0009] The tensioning module is located on one side of the drive chain and is used to tension the drive chain.

[0010] A pressure sensor is installed on the tensioning module to measure the pressure between the tensioning module and the drive chain.

[0011] The mobile module connects to the drive host and is used to move the drive host.

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

[0013] Furthermore, the tensioning module includes a telescopic mechanism, and the telescopic end of the telescopic mechanism is provided with a tensioning sprocket that meshes with the drive chain.

[0014] Furthermore, the number of telescopic mechanisms is set to two, with the two telescopic mechanisms respectively located on both sides of the drive spindle.

[0015] Furthermore, the moving module includes a vertical moving mechanism and a horizontal moving mechanism. The horizontal moving mechanism is located at the bottom of the drive host and is used to drive the drive host to move horizontally to move closer to or away from the drive spindle. The vertical moving mechanism is located at the bottom of the horizontal moving mechanism and is used to drive the horizontal moving mechanism and the drive host to move vertically.

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

[0017] S1. Obtain the vibration data of the escalator in real time through vibration sensors, and obtain the vibration spectrum based on the vibration data;

[0018] S2. Determine 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 achieved, the first preset processing solution is executed to eliminate the vibration of the escalator; if resonance is not achieved, the second preset processing solution is executed to eliminate the vibration of the drive chain.

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

[0022] S41. Determine the adjustment speed;

[0023] S42. Determine whether the deviation between the actual running speed and the nominal speed of the escalator is less than the first threshold after the speed of the drive host is reduced and adjusted. If yes, proceed to step S43; otherwise, proceed to step S45.

[0024] S43. The speed of the drive host is reduced and adjusted by controlling the frequency converter, and the vibration data of the escalator is obtained by the vibration sensor. Based on the vibration data, it is determined whether the vibration of the escalator is less than the preset vibration value. If so, the drive host is controlled to run at the reduced speed. If not, step S44 is executed.

[0025] S44. Repeat steps S41 to S42;

[0026] S45. The drive host is gradually raised or lowered by the moving mechanism, and during the process of raising or lowering the drive host, the drive host is moved horizontally by the moving mechanism or the drive chain is tensioned by the tensioning mechanism, so that the pressure between the tensioning module and the drive chain is maintained within the preset pressure range.

[0027] The steps of the second preset processing scheme include:

[0028] S46. The drive chain is gradually tensioned by the tensioning mechanism until the vibration of the escalator is less than the preset vibration value.

[0029] Compared to existing technologies, the advantages of this invention are as follows: It monitors escalator vibration using vibration sensors without requiring passenger feedback. Furthermore, it increases the wrap angle between the drive chain and the drive unit sprocket by tensioning the drive chain using a tensioning module, thereby changing the length of the tight side of the drive chain. This increases the chain wrap angle on the drive unit sprocket, improving the stability of the chain drive. Alternatively, it controls the speed of the drive unit using a frequency converter to adjust the tension of the drive chain, or adjusts the horizontal and vertical positions of the drive unit using a moving module. Horizontal position adjustment constantly tensions the drive chain, reducing the amplitude and frequency of vibration during drive chain transmission, thus reducing chain wear. 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 unit sprocket, automatically eliminating drive chain vibration and thus eliminating escalator vibration. This eliminates the need for escalator shutdown for maintenance, reducing maintenance costs. Attached Figure Description

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

[0031] Figure 2 This is a schematic diagram of the structure of the device for eliminating vibration of the escalator drive chain according to the present invention;

[0032] Figure 3 This is a schematic diagram of the device for eliminating vibration of the escalator drive chain according to the present invention, which tensions the chain via a tensioning module;

[0033] Figure 4 This is a schematic diagram of the device for eliminating vibration of the escalator drive chain according to the present invention, which moves the drive host via a moving module.

[0034] In the diagram, 1-escalator, 11-drive host, 12-drive spindle, 13-drive chain, 14-truss, 15-drive sprocket, 2-vibration sensor, 3-frequency converter, 4-tensioning module, 41-telescopic mechanism, 42-tensioning sprocket, 5-moving module, 51-horizontal moving mechanism, 52-vertical moving mechanism, 6-controller. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0037] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this invention, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0039] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed when in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0040] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the device for eliminating vibration of the escalator drive chain according to the present invention installed on an escalator. Figure 2 This is a schematic diagram of the device for eliminating vibration of an escalator drive chain according to the present invention. The device is installed on an escalator 1, which includes a drive unit 11, a drive shaft 12, and a drive chain 13 wound around the drive unit 11 and the drive shaft 12. The device includes a vibration sensor 2, a frequency converter 3, a tensioning module 4, a pressure sensor, a movement module 5, and a controller 6. The vibration sensor 2 is installed on the escalator 1 to collect vibration data during the operation of the escalator 1. The frequency converter 3 is electrically connected to the drive unit 11 and controls the rotational speed of the drive unit 11. The tensioning module 4 is installed on one side of the drive chain 13 to tension the drive chain 13. The pressure sensor is installed on the tensioning module 4 to measure the pressure between the tensioning module 4 and the drive chain 13. The movement module 5 is connected to the drive unit 11 and moves the drive unit 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 movement module 5.

[0041] The abnormal vibration phenomenon occurring during the operation of the escalator 1 originates from the vibration of the drive chain 13 during transmission. There are two main reasons for the severe vibration of the drive chain 13: First, the wear of the rollers, chain plates, or pins of the drive chain 13 during use will cause fatigue elongation of the drive chain 13. If the drive chain 13 is not tensioned in time, it is easy to cause vibration of the drive chain 13, and even cause tooth skipping when meshing with the drive sprocket 15 on the drive host 11, thus causing vibration of the drive chain 13. Second, when the vibration frequency of the drive chain 13 of the escalator 1 coincides with the meshing frequency of the drive sprocket 15 under a specific load rate and operating speed, resonance will occur. Resonance will aggravate the vibration amplitude of the drive chain 13, thereby causing instability in the operation of the escalator and accelerating the wear of the drive chain 13.

[0042] Furthermore, the formula for calculating the natural frequency of the drive chain 13 is as follows: Among them, f nLet f be the natural frequency of the drive chain 13, L be the length of the tight side of the drive chain 13, F be the tension of the drive chain 13, g be the acceleration due to gravity, G be the weight per unit length of the chain, α be the angle between the transmission centerline and the horizontal plane, and β be the angle between the tight side of the drive chain 13 and the centerline. Therefore, the natural frequency f of the drive chain 13 is affected by... n The factors include the tension F of the drive chain 13, the length L of the tight side of the drive chain 13, and the angle between the transmission center line and the horizontal plane, as well as the difference α-β between the angle between the tight side of the drive chain 13 and the transmission center line. Therefore, based on the causes of vibration of the drive chain 13 and the factors affecting the natural frequency of the drive chain 13, the present invention's device for eliminating vibration of the escalator drive chain determines three schemes for eliminating vibration of the escalator 1:

[0043] The first approach involves the controller 6 outputting a signal to the frequency converter 3, which in turn outputs a frequency signal to control the speed of the drive unit 11, thereby adjusting the tension of the drive chain 13 to avoid the frequency of sprocket engagement. Specifically, the controller 6 outputs a control signal to the frequency converter 3, which in turn outputs a frequency signal to the drive unit 11, converting it into magnetic fields of different alternating frequencies to control the speed of the drive unit 11. This is based on the torque calculation formula for the drive unit 11. It is known that, with constant power, the rotational speed n of the drive unit 11 is directly proportional to the output torque T. Reducing the rotational speed of the drive unit 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 rotational speed of the drive unit 11 is further reduced, forming a closed-loop control. When the vibration of the escalator 1 disappears, it runs at the current rotational speed of the drive unit 11.

[0044] Please refer to the following: Figure 3 , Figure 3 This is a schematic diagram of the device for eliminating vibration of the escalator drive chain according to the present invention, which tensions the chain via a tensioning module. The second approach involves the controller 6 controlling the tensioning module 4 to tension the drive chain 13, increasing the wrap angle of the drive chain 13 around the drive sprocket 15, and changing the length of the tight side of the drive chain 13. This avoids the sprocket meshing frequency while simultaneously increasing the chain wrap angle θ of the drive sprocket 15. Figure 3As shown, this improves the stability of the chain drive. During the tensioning process, the pressure between the tensioning module 4 and the drive chain 13 can be monitored by a pressure sensor to avoid excessive clamping force on the drive chain 13. Specifically, the controller 6 controls the tensioning module 4 to gradually clamp the drive chain 13. When the vibration sensor 2 detects that the vibration amplitude of the escalator 1 has decreased to a preset vibration value that does not affect the passenger's riding experience, the controller 6 stops outputting signals to the tensioning module 4. If the clamping force on the drive chain 13 is too large during the tensioning process, the moving module 5 can move the moving host horizontally towards the drive spindle 12, thereby keeping the tension of the drive chain 13 constant and ultimately increasing the chain wrap angle θ on the drive sprocket 15 of the drive host 11. Appropriately increasing the chain wrap angle θ can improve the stability of the drive chain 13 transmission. In one embodiment, the tensioning module 4 includes a telescopic mechanism 41, and the telescopic end of the telescopic mechanism 41 is provided with a tensioning sprocket 42 that meshes with the drive chain 13. The extension of the telescopic mechanism 41 causes the tensioning sprocket 42 to gradually press against the drive chain 13, thereby tensioning the drive chain 13. Simultaneously, the angle θ of the drive chain 13 wrapping around the drive host 11 sprocket can be increased, and the length of the tight side of the drive chain 13 can be changed. To maximize the angle of wrapping of the drive chain 13 around the drive host 11 sprocket, in one embodiment, two telescopic mechanisms 41 are used, each positioned on one side of the drive spindle 12. With two telescopic mechanisms 41 located outside the drive chain 13, they work together to tension the drive chain 13, ensuring that the drive chain 13 on both sides of the drive host 11 sprocket wraps around it, further increasing the angle θ of wrapping. Existing telescopic mechanisms 41, such as cylinders, can be used for the telescopic mechanism 41.

[0045] Please refer to the following: Figure 4 , Figure 4 This is a schematic diagram of the device for eliminating vibration of the escalator drive chain according to the present invention, which moves the drive host via a moving module. The third solution involves the controller 6 controlling the moving module 5 to move the drive host 11, thereby adjusting the horizontal and vertical positions of the drive sprocket 15 on the drive host 11. Adjusting the horizontal position of the drive sprocket 15 keeps the drive chain 13 constantly tensioned, reducing the vibration amplitude and frequency of the drive chain 13 during transmission, thus reducing wear on the drive chain 13. Adjusting the vertical position of the drive sprocket 15 changes the angle between the tight side of the chain and the horizontal line or the transmission center line, similarly avoiding the resonant frequency of the sprocket meshing. Specifically, when the controller 6 controls the moving module 5 to raise or lower the height of the drive host 11, the angle α between the transmission center line and the horizontal plane of the drive chain 13 increases or decreases as the drive host 11 rises or falls, while the angle β between the tight side of the drive chain 13 and the transmission center line remains unchanged. Figure 4 As shown. Therefore, the change in the difference between α and β also affects the natural frequency of the drive chain 13. During the raising or lowering of the drive host 11, the drive chain 13 may become too loose or too tight. Based on the clamping 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 tension the drive chain 13; when the drive chain 13 is too tight, the controller 6 moves the drive host 11 horizontally towards the drive spindle 12 through the moving module 5 to loosen the drive chain 13, so that the clamping force of the drive chain 13 is maintained 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 located at the bottom of the drive host 11 and is used to drive the drive host 11 to move horizontally to move closer to or away from the drive spindle 12. The vertical moving mechanism 52 is located 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 motor-driven screw mechanisms, lifting mechanisms and belt drive mechanisms, etc., and are not limited here.

[0046] The above three solutions can be selected according to the actual 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 to collect vibration data transmitted from the drive component to the truss 14 in real time when the escalator 1 is running. The vibration data includes vibration frequency and vibration amplitude. Thus, the controller 6 can draw a vibration spectrum based on the vibration data collected by the vibration sensor 2 and determine whether the vibration of the escalator 1 is caused by the chain not being tensioned or by resonance vibration caused by the vibration frequency of the drive chain 13 coinciding with the meshing frequency of the sprocket. If the vibration of the escalator 1 is caused by the untensioned drive chain 13, the second solution is adopted, which gradually tensions the drive chain 13 through the tensioning module 4 to eliminate the vibration of the escalator 1. If it is resonant vibration, the quickest solution is to adopt the first solution, which adjusts the tension of the drive chain 13 to avoid the resonant frequency. However, if the adjustment of the tension of the drive chain 13 continues during the adjustment process, it will cause the actual running speed of the escalator 1 to exceed the nominal speed deviation range of 5% after the speed of the drive host 11 is reduced. In this case, the third solution is adopted, which moves the drive host 11 through the moving module 5 to adjust the angle α between the transmission center line and the horizontal plane and the angle β between the tight side of the drive 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 escalator drive chain, utilizing the above-mentioned device for eliminating vibration of escalator drive chain, the method comprising the following steps:

[0048] S1. The vibration data of the escalator 1 is acquired in real time through the vibration sensor 2, and the vibration spectrum is obtained based on the vibration data;

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

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

[0051] S4. If resonance is achieved, the first preset processing scheme is executed to eliminate the vibration of the escalator 1. If resonance is not achieved, 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. Determine the adjustment speed;

[0054] S42. Determine whether the deviation between the actual running speed and the nominal speed of the escalator 1 after the speed of the drive host 11 is reduced and adjusted is less than the first threshold. If yes, proceed to step S43; otherwise, proceed to step S45.

[0055] S43. The speed of the drive host 11 is reduced and adjusted by controlling the speed of the frequency converter 3, and the vibration data of the escalator 1 is obtained by the vibration sensor 2. Based on the vibration data, it is determined whether the vibration of the escalator 1 is less than the preset vibration value. If so, the drive host 11 is controlled to run at the reduced speed. If not, step S44 is executed.

[0056] S44. Repeat steps S41 to S42;

[0057] S45. The drive host 11 is gradually raised or lowered by the moving mechanism. During the process of raising or lowering the drive host 11, the drive host 11 is moved horizontally by the moving mechanism or the drive chain 13 is tensioned by the tensioning mechanism, so that the pressure between the tensioning module 4 and the drive chain 13 is maintained within the preset pressure range.

[0058] The steps of the second preset processing scheme include:

[0059] S46. The drive chain 13 is gradually tensioned by the tensioning mechanism until the vibration of the escalator 1 is less than the preset vibration value.

[0060] In step S1 above, vibration sensor 2 is installed on the truss 14 of escalator 1 to collect vibration data transmitted from the drive component to the truss 14 during the operation of escalator 1 in real time and transmit it to controller 6. Controller 6 can then plot the vibration spectrum based on the vibration data collected by vibration sensor 2. The vibration data includes vibration frequency and vibration amplitude, and the vibration spectrum is a curve of velocity changing with frequency.

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

[0062] In step S3 above, the vibration of the escalator 1 may be due to fatigue elongation of the drive chain 13 caused by wear of rollers, chain plates, or pins during use. If the drive chain 13 is not tensioned in time, it is prone to vibration, and may even experience tooth skipping when meshing with the drive sprocket 15 on the drive unit 11, thus causing vibration of the drive chain 13. Alternatively, when the vibration frequency of the drive chain 13 at a specific load rate and operating speed coincides with the meshing frequency of the drive sprocket 15, resonance will occur. Resonance will intensify the vibration amplitude of the drive chain 13, resulting in vibration of the escalator 1. If the speed at a certain frequency in the vibration spectrum is greater than the preset speed, it indicates that the frequency is the resonance frequency, and it can be determined that the escalator 1 has reached resonance. This indicates that the vibration of the escalator 1 is caused by resonance.

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

[0064] In step S41 above, the adjustment speed Δn can be determined according to the actual situation. For example, the adjustment speed Δn can be preset to a fixed value, or it can be determined by the difference between the chain's natural frequency fn and the sprocket meshing frequency to eliminate resonance as quickly as possible. Specifically, if the difference between the chain's natural frequency fn and the sprocket meshing frequency is larger, it means that resonance is less likely to occur, so the adjustment speed Δn is reduced. If the difference between the chain's natural frequency fn and the sprocket meshing frequency is smaller, it means that resonance is more likely to occur, so the adjustment speed Δn is increased. The sprocket meshing frequency is calculated based on the escalator's current running speed to the speed of the drive sprocket 15 on the drive host 11, and the number of teeth meshing per second is calculated based on the number of teeth on the drive sprocket 15.

[0065] In step S42 above, during the operation of the escalator 1, a nominal speed is defined according to different operating conditions. The deviation between the actual operating speed and the nominal speed of the escalator 1 cannot exceed a preset first threshold, which is generally 5%. Therefore, during the process of eliminating vibration of the escalator 1, if the deviation between the actual operating speed and the nominal speed of the escalator 1 is greater than or equal to the first threshold after the speed of the drive host 11 is reduced and adjusted, then the resonance situation cannot be avoided by reducing the speed of the drive host 11. In this case, step S45 needs to be executed, i.e., the third solution is implemented. If the deviation between the actual operating speed and the nominal speed of the escalator 1 is less than the first threshold after the speed of the drive host 11 is reduced and adjusted, then the resonance situation can be avoided by reducing the speed of the drive host 11. In this case, step S43 is executed, i.e., the first solution is implemented.

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

[0067] In step S45 above, by gradually raising or lowering the drive host 11 through the moving mechanism, the difference α-β between the angle between the transmission centerline and the horizontal plane and the angle between the tight side of the drive chain 13 and the transmission centerline can be adjusted. This avoids the vibration frequency of the drive chain 13 from being the same as the meshing frequency of the drive sprocket 15, thus eliminating the vibration of the escalator 1. Specifically, when it is necessary to reduce α-β, the drive host 11 is raised by the moving module 5; when it is necessary to increase α-β, the drive host 11 is lowered by the moving module 5. During the raising or lowering of the drive host 11, the drive host 11 is moved horizontally by the moving mechanism or the drive chain 13 is tensioned by the tensioning mechanism, so that the pressure between the tensioning module 4 and the drive chain 13 is maintained within a preset pressure range, avoiding vibration of the escalator 1 caused by the elongation of the drive chain 13.

[0068] In step S46 above, based on the pressure feedback from the pressure sensor between the tensioning module 4 and the drive chain 13, the tensioning module 4 gradually tightens the drive chain 13. When the vibration sensor 2 detects that the vibration of the escalator 1 is less than the preset vibration value, that is, when the vibration amplitude of the entire escalator 1 is reduced to a threshold that does not affect the passenger's riding experience, the controller 6 stops outputting signals to the tensioning module 4 and stops further tensioning the drive chain 13.

[0069] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Therefore, any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method of eliminating vibration of an escalator drive chain, characterized by, The method comprises the following steps: S1, acquiring vibration data of the escalator in real time through a vibration sensor, and obtaining a vibration spectrum according to the vibration data; S2, determining whether the escalator vibrates based on the vibration spectrum; S3, if the escalator vibrates, judging whether the escalator reaches resonance according to the vibration spectrum; S4, if the escalator reaches resonance, executing a first preset processing scheme to eliminate the vibration of the escalator, and if the escalator does not reach resonance, executing a second preset processing scheme to eliminate the vibration of the driving chain; The steps of the first preset processing scheme comprise: S41, determining an adjustment rotating speed; S42, judging whether the deviation between the actual running speed of the escalator and the nominal speed after the rotating speed of the driving host is reduced to the adjustment rotating speed is less than a first threshold value, if yes, executing step S43, and if no, executing step S45; S43, controlling the rotating speed of the driving host to be reduced to the adjustment rotating speed through a frequency converter, acquiring the vibration data of the escalator through the vibration sensor, and judging whether the vibration of the escalator is less than a preset vibration value based on the vibration data, if yes, controlling the driving host to run at the reduced rotating speed, and if no, executing step S44; S44, repeating steps S41 to S42; S45, gradually raising or lowering the driving host through a moving mechanism, and in the process of raising or lowering the driving host, moving the driving host horizontally through the moving mechanism or tensioning the driving chain through a tensioning mechanism, so that the pressure between the tensioning module and the driving chain is kept within a preset pressure interval; The steps of the second preset processing scheme comprise: S46, gradually tensioning the driving chain through the tensioning mechanism until the vibration of the escalator is less than the preset vibration value.

2. A device for eliminating vibration of a drive chain of an escalator, for use in implementing the method for eliminating vibration of a drive chain of an escalator according to claim 1, the escalator including a drive main body, a drive main shaft, and a drive chain wound around the drive main body and the drive main shaft, characterized by The device comprises: a vibration sensor arranged on the escalator and used for collecting vibration data of the escalator when the escalator runs; a frequency converter electrically connected with the driving host and used for controlling the rotating speed of the driving host; a tensioning module arranged on one side of the driving chain and used for tensioning the driving chain; a pressure sensor arranged on the tensioning module and used for measuring the pressure between the tensioning module and the driving chain; a moving module connected with the driving host and used for moving the driving host; a controller electrically connected with the vibration sensor, the frequency converter, the tensioning module, the pressure sensor and the moving module.

3. The apparatus for eliminating vibration of an escalator drive chain according to claim 2, wherein The tensioning module comprises a telescopic mechanism, and a tensioning sprocket engaged with the driving chain is arranged on the telescopic end of the telescopic mechanism.

4. The apparatus for eliminating vibrations in a drive chain of an escalator according to claim 3, characterized in that, The number of the telescopic mechanisms is two, and the two telescopic mechanisms are arranged on the two sides of the driving main shaft respectively.

5. The apparatus for eliminating vibration of an escalator drive chain according to claim 2, wherein The moving module comprises a vertical moving mechanism and a horizontal moving mechanism, the horizontal moving mechanism is arranged at the bottom of the driving host and used for driving the driving host to move horizontally to approach or move away from the driving main shaft, and the vertical moving mechanism is arranged at the bottom of the horizontal moving mechanism and used for driving the horizontal moving mechanism and the driving host to move vertically.

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