Automatic oil injection device and method for escalator step chain

Abstract

The invention relates to an automatic oil injection device and method for an escalator step chain, the automatic oil injection device comprises a positioning mechanism and an oil injection mechanism, the oil injection mechanism is arranged on the positioning mechanism, and the oil injection mechanism comprises an oil nozzle; the control mechanism comprises a sensor and a controller, the sensor is used for detecting a roller assembly on the step chain, and the controller is used for controlling the movement of the oil nozzle; when the sensor detects the roller assembly for the first time, the controller controls the oil nozzle to move, and when the sensor detects the roller assembly again, the controller controls the oil nozzle to be in butt joint with the oil injection port. The device is directly arranged in the escalator, and the structure of the escalator does not need to be transformed; according to the running state of the escalator, the controller controls the oil injection mechanism to move through a detection signal, when the sensor feeds back the signal, the controller stops moving immediately, it is ensured that the oil nozzle is accurately aligned with the oil injection port, closed-loop control is formed, manual intervention is not needed, and full-automatic oil injection operation is achieved.

Description

Automatic oiling device and method for escalator step chains Technical Field

[0001] This application relates to the field of escalator technology, and in particular to an automatic oiling device and method for escalator step chains. Background Technology

[0002] Grease-lubricated escalator chains, as a core component of escalator drive systems, utilize specialized grease nozzles to directly inject grease into the chain joints, achieving precise and thorough lubrication. This lubrication method effectively reduces friction and wear, significantly extends chain lifespan, and offers environmental advantages, thus gaining widespread application in escalators, especially outdoor escalators. However, during long-term operation, grease can slowly overflow due to compression and temperature changes, leading to a decrease in lubrication effectiveness, necessitating regular grease replenishment. Insufficient lubrication will accelerate chain wear, cause jamming, and severely impact equipment lifespan and operational safety.

[0003] Currently, lubrication of grease-based ladder chains mainly relies on manual, periodic grease application, but this method has significant drawbacks. First, manual lubrication requires stopping the ladder at each link, which is time-consuming and reduces equipment efficiency. Second, manual operation makes it difficult to ensure a uniform amount of grease on each link, easily leading to uneven lubrication, with some links over-lubricated and others under-lubricated. Third, due to the large number of lubrication points, manual grease application is prone to missed areas, leaving some parts of the chain without necessary lubrication protection. Furthermore, regularly scheduling maintenance personnel for lubrication not only increases labor and time costs but also reduces the economic efficiency of maintenance. These problems not only accelerate chain wear but also create safety hazards, urgently requiring technological improvements. Summary of the Invention

[0004] Therefore, it is necessary to provide an automatic lubrication device and method for escalator step chains to address the problems of uneven lubrication volume, low efficiency, and poor safety, thereby improving lubrication efficiency, ensuring equipment operation safety, and reducing maintenance costs.

[0005] On the one hand, an automatic oiling device for an escalator step chain is provided, the automatic oiling device comprising:

[0006] The positioning mechanism is fixedly installed on one side of the ladder chain;

[0007] An oiling mechanism is provided at the positioning mechanism. The oiling mechanism includes an oil nozzle, which can be connected to or disconnected from the oiling port of the ladder chain; and

[0008] The control mechanism includes a sensor and a controller. The sensor is used to detect the roller assembly on the ladder chain, and the controller is used to control the movement of the grease nozzle. When the sensor detects the roller assembly for the first time, the controller controls the movement of the grease nozzle. When the sensor detects the roller assembly again, the controller controls the grease nozzle to connect with the oil inlet.

[0009] In one embodiment, the controller is also used to control the switching of the working state of the escalator, the working state of the escalator including a waiting-to-lubricate mode and a lubricate mode. When switching to the waiting-to-lubricate mode, the controller controls the escalator to decelerate to low speed. When the sensor detects the roller assembly for the first time, the controller controls the escalator to switch to the lubricate mode, so that the escalator stops running.

[0010] In one embodiment, the positioning mechanism includes a mounting positioning plate with a plurality of positioning holes along an extension direction perpendicular to the ladder chain, and the oil injection mechanism is configured according to the positioning holes.

[0011] In one embodiment, the automatic oiling device further includes a feeding mechanism movably connected between the positioning mechanism and the oil nozzle. The feeding mechanism can drive the oil nozzle to move along the extension direction of the ladder chain, and the feeding mechanism can drive the oil nozzle to move closer to or away from the ladder chain.

[0012] In one embodiment, the positioning mechanism includes a first bracket, the oil injection mechanism is disposed on the first bracket, the feeding mechanism includes a first driving member, a second driving member, a second bracket and a third bracket, the first driving member is disposed on the first bracket and the driving end of the first driving member is connected to the second bracket, the second driving member is disposed on the second bracket and the driving end of the second driving member is connected to the third bracket, and the oil nozzle is disposed on the third bracket.

[0013] In one embodiment, a first bearing is provided between the first bracket and the second bracket, and a second bearing is provided between the third bracket and the second bracket; the edges of the first bracket, the second bracket and / or the third bracket are provided with guide edges.

[0014] In one embodiment, the oiling mechanism further includes a grease pump and a grease distributor. The grease nozzle is connected to the grease distributor via a pipeline, and the grease distributor is connected to the grease pump via a pipeline. The grease distributor is used to distribute a fixed amount of grease to the grease nozzle within a set time.

[0015] On the one hand, an automatic oiling method for an escalator step chain is provided, employing the aforementioned automatic oiling device for an escalator step chain. The automatic oiling method includes the following steps:

[0016] The escalator is in a lubrication-ready mode and is running at low speed.

[0017] When the roller assembly of the ladder chain is detected, the control nozzle moves along the extension direction of the ladder chain;

[0018] The escalator switched to oil filling mode and stopped operating.

[0019] When the roller assembly of the ladder chain is detected again, control the grease nipple to connect to the oil inlet;

[0020] Start the oil filling process.

[0021] In one embodiment, the step of initiating oil injection further includes:

[0022] After the oil filling is completed, the oil nozzle returns to its initial position;

[0023] The escalator starts and switches to the lubrication mode, repeating the steps of checking the roller assembly and controlling the oil nozzle until lubrication is complete.

[0024] In one embodiment, the number of steps is calculated based on the lifting height of the escalator, each step has a preset number of oil inlets, and the number of automatic oiling cycles is set according to the total number of oil inlets.

[0025] The device in this application is directly installed inside the escalator without requiring any modification to the escalator structure. By setting up a control mechanism to detect the operating status of the escalator, the controller controls the movement of the oil injection mechanism through the detection signal. When the sensor feeds back a signal, the controller immediately stops moving to ensure that the oil nozzle and the oil injection port are precisely aligned, forming a closed-loop control. No manual intervention is required, and fully automatic oil injection operation is achieved. Attached Figure Description

[0026] Figure 1 is a schematic diagram of oil injection in the prior art.

[0027] Figure 2 is a schematic diagram of an automatic oiling device installed on an escalator according to an embodiment of this application.

[0028] Figure 3 is a schematic diagram of the ladder chain structure according to an embodiment of this application.

[0029] Figure 4 is a schematic diagram of the automatic oiling device according to an embodiment of this application during oil injection.

[0030] Figure 5 is a schematic diagram of the structure of an automatic oiling device according to an embodiment of this application when it is reset to the initial position.

[0031] Figure 6 is a structural schematic diagram of an automatic oiling device according to an embodiment of this application from another perspective.

[0032] Figure 7 is a partial structural schematic diagram of the control mechanism according to an embodiment of this application.

[0033] Figure 8 is a flowchart illustrating an automatic oiling method according to an embodiment of this application.

[0034] Explanation of icon numbers:

[0035] 10. Ladder chain; 11. Roller assembly; 12. Chain assembly; 13. Oil inlet; 14. Guide rail; 20. Escalator control system; 100. Automatic oil injection device; 110. Positioning mechanism; 111. Mounting positioning plate; 112. Positioning hole; 113. First bracket; 120. Feeding mechanism; 121. First drive component; 121a. Servo motor; 121b. Worm gear assembly; 122. Second drive component; 123. Second bracket; 124. Third bracket; 125. First bearing; 126. Second bearing; 130. Oil injection mechanism; 131. Oil nozzle; 132. Grease distributor; 133. Grease pump; 140. Control mechanism; 141. Sensor; 142. Controller. Detailed Implementation

[0036] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0037] Referring to Figures 1-7, which show a schematic diagram of the structure of an automatic oiling device 100 for an escalator step chain 10 according to an embodiment of this application, the automatic oiling device 100 provided in this embodiment is located at the step chain 10 inside the escalator. The structure of the step chain 10 is shown in Figure 1. The step chain 10 includes roller assemblies 11 and chain assemblies 12. The roller assemblies 11 are spaced apart within the chain assemblies 12 and are mounted on guide rails 14. Both the roller assemblies 11 and the chain assemblies 12 are provided with oiling ports 13. Typically, there are 3-6 oiling nodes within each step. The automatic oiling device 100 includes a positioning mechanism 110, an oiling mechanism 130, and a control mechanism 140.

[0038] A positioning mechanism 110 is fixedly installed on one side of the ladder chain 10. An oiling mechanism 130 is disposed on the positioning mechanism 110. The oiling mechanism 130 includes an oil nozzle 131, which can be engaged or disengaged from the oil inlet 13 of the ladder chain 10. A control mechanism 140 includes a sensor 141 and a controller 142. The sensor 141 is used to detect the roller assembly 11 on the ladder chain 10, and the controller 142 is used to control the movement of the oil nozzle 131. When the sensor 141 first detects the roller assembly 11, the controller 142 controls the oil nozzle 131 to move; when the sensor 141 detects the roller assembly 11 again, the controller 142 controls the oil nozzle 131 to engage with the oil inlet 13.

[0039] The device of this application is directly installed inside the escalator without modifying the escalator structure. By setting up a control mechanism 140 to detect the operating status of the escalator, the controller 142 controls the movement of the oil injection mechanism 130 through the detection signal. When the sensor 141 feeds back a signal, the controller 142 immediately stops moving to ensure that the oil nozzle 131 is precisely aligned with the oil injection port 13, forming a closed-loop control. No manual intervention is required to realize fully automatic oil injection operation.

[0040] In one embodiment, the positioning mechanism 110 includes a mounting positioning plate 111. The mounting positioning plate 111 has multiple positioning holes 112 along an extension direction perpendicular to the ladder chain 10. The oiling mechanism 130 is positioned according to the positioning holes 112. Specifically, the mounting positioning plate 111 is located below the ladder chain 10, fixedly connected to the guide rail 14, and extends outward from the guide rail 14 in a direction away from the ladder chain 10. The extended portion of the mounting positioning plate 111 is used to mount other components. Specifically, the positioning holes 112 are elongated holes, and a scale may also be provided on one side of the positioning hole 112. The automatic oiling device 100 is installed according to the scale markings, thus positioning the distance relative to the oiling port 13 of the ladder chain 10. The automatic oiling device is positioned by the mounting positioning plate 111 to ensure correct installation and prevent the oil nozzle 131 from misaligning with the oiling port 13 of the ladder chain 10.

[0041] In one embodiment, the automatic oiling device 100 further includes a feeding mechanism 120, which is movably connected between the positioning mechanism 110 and the oil nozzle 131. The feeding mechanism 120 can drive the oil nozzle 131 to move along the extension direction of the ladder chain 10, and the feeding mechanism 120 can drive the oil nozzle 131 to move closer to or away from the ladder chain 10.

[0042] In one embodiment, the positioning mechanism 110 includes a first bracket 113, the oil injection mechanism 130 is disposed on the first bracket 113, the feeding mechanism 120 includes a first driving member 121, a second driving member 122, a second bracket 123 and a third bracket 124, the first driving member 121 is disposed on the first bracket 113 and the driving end of the first driving member 121 is connected to the second bracket 123, the second driving member 122 is disposed on the second bracket 123 and the driving end of the second driving member 122 is connected to the third bracket 124, and the oil nozzle 131 is disposed on the third bracket 124.

[0043] Specifically, the first bracket 113 is fixedly connected to the portion of the mounting positioning plate 111 extending out of the guide rail 14. The first bracket 113 is L-shaped, and includes a horizontal portion parallel to the mounting positioning plate 111 and a vertical portion perpendicular to the mounting positioning plate 111 and extending downwards. The oil injection mechanism 130 is located in the vertical portion. The first bracket 113 is installed at the positioning hole 112 and is fixedly connected to the mounting positioning plate 111 by fasteners.

[0044] A first driving component 121 is also fixed on the first support 113. Preferably, the first driving component 121 is a combination of a servo motor 121a and a worm gear assembly 121b. The output end of the worm gear assembly 121b is connected to the second support 123. The servo motor 121a drives the worm gear assembly 121b to move, thereby driving the second support 123 to move along the extension direction of the ladder chain 10. A coupling is also provided between the servo motor 121a and the worm gear assembly 121b.

[0045] The second bracket 123 is elongated and parallel to the ladder chain 10. The second drive element 122 is fixed to the second bracket 123, and its output end is connected to the third bracket 124. The third bracket 124 is also elongated and parallel to the ladder chain 10, spaced apart from the second bracket 123. Preferably, the second drive element 122 is a push-pull electromagnet. When energized, the push-pull electromagnet pushes the third bracket 124 towards the ladder chain 10 under electromagnetic force, causing the oil nozzle 131 to engage with the oil inlet 13 of the ladder chain 10. When de-energized, the third bracket 124 is pulled back to its original position under spring force. The push-pull electromagnet structure is simple and low in cost.

[0046] In one embodiment, a first bearing 125 is provided between the first bracket 113 and the second bracket 123, and a second bearing 126 is provided between the third bracket 124 and the second bracket 123; the edges of the first bracket 113, the second bracket 123 and / or the third bracket 124 are provided with guide edges.

[0047] Specifically, the first L-shaped bracket 113 has a guide edge at one end facing the ladder chain 10. Guide edges are also provided at both ends of the second and third brackets, parallel to the direction of the ladder chain 10. These guide edges guide the feeding system to move smoothly along the direction of the ladder chain 10. The guide edges have a rounded corner bend at the edge of the bracket, and the protrusion height of the guide edges is lower than the height of the first bearing 125 or the second bearing 126. The first bearing 125 is fixed to the second bracket 123, with its outer periphery fitting against the first bracket 113, and the first bearing 125 abutting within the guide edge of the first bracket 113. The second bearing 126 is fixed to the third bracket 124, with its outer periphery fitting against the second bracket 123, and the second bearing 126 abutting within the guide edge of the second bracket 123.

[0048] In one embodiment, the oiling mechanism 130 further includes a grease pump 133 and a grease distributor 132. The grease nozzle 131 is connected to the grease distributor 132 via a pipeline, and the grease distributor 132 is connected to the grease pump 133 via a pipeline. The grease distributor 132 is used to distribute a fixed amount of grease to the grease nozzle 131 within a set time.

[0049] Specifically, the grease pump 133 is fixed to the first bracket 113, and the grease distributor 132 and the grease nozzle 131 are located on the third bracket 124. The grease injection mechanism 130 is connected to the control mechanism 140. The grease pump 133 has an oil level monitoring function. When the grease is insufficient, it sends a signal to the controller 142, which then notifies maintenance personnel to replenish the grease. The grease distributor 132 is a quantitative depressurization type grease distributor. The controller 142 has a preset calculation formula to control the preset flow rate of the grease distributor 132. The preset amount of grease is injected into the oil passage of the ladder chain 10 through the grease nozzle 131 within a set time, ensuring uniform and controllable grease injection.

[0050] In one embodiment, the sensor 141 is an electromagnetic metal sensor 141, used to detect the metal hub or bearing inside the roller assembly 11 of the ladder chain 10, and feeds back the detection signal to the controller 142. The sensor 141 has a limited detection distance. Since the chain assembly 12 is far from the sensor 141, the roller assembly 11 is used as the detection target. Therefore, the sensor 141 is set on the feeding mechanism 120, and in the initial position, the distance between the sensor 141 and the roller assembly 11 is slightly less than the maximum detection distance of the sensor 141. The sensor 141 is arranged side by side with the oil nozzle 131. Specifically, the sensor 141 is located on the third bracket 124 and above the oil nozzle 131.

[0051] In one embodiment, the controller 142 is embedded in the escalator control system 20. Besides receiving signals from the sensor 141, it can also control the escalator's start / stop, the feed system's operation, and the grease lubrication pump's operation. The controller 142 has a data recording function, used to record information such as the number of grease injections, the amount of grease injected, and the grease injection time, facilitating later maintenance and management. Specifically, the escalator control system 20 has an area for housing the control mechanism 140, which is connected to other structures via cables from the escalator control system 20.

[0052] In one embodiment, the controller 142 is also used to control the switching of the working state of the escalator, the working state of the escalator including the waiting-to-lubricate mode and the lubricate mode. When switching to the waiting-to-lubricate mode, the controller 142 controls the escalator to decelerate to low speed. When the sensor 141 first detects the roller assembly 11, the controller 142 controls the escalator to switch to the lubricate mode, so that the escalator stops running.

[0053] Specifically, the "waiting for lubrication" mode is defined as the state before lubrication after receiving a lubrication signal, during which the escalator needs to run at low speed. The "lubrication" mode is defined as the state after the feed mechanism 120 moves and the oil nozzle 131 connects with the lubrication port 13, at which point lubrication begins, and the escalator needs to stop and remain stationary. The escalator's operating states also include a normal mode. In normal mode, lubrication is not required. The escalator switches from normal mode to waiting for lubrication mode by the user, or automatically by the controller 142 based on the escalator's running time. When switching from waiting for lubrication mode to lubrication mode, although the escalator stops, its running speed does not immediately drop to zero; there is an inertial gliding state between low-speed operation and complete stillness.

[0054] Referring to Figure 8, which shows a flowchart of an automatic oiling method for an escalator step chain 10, the automatic oiling method using the aforementioned automatic oiling device 100 for the escalator step chain 10 includes the following steps:

[0055] S100, the escalator is in the lubrication waiting mode and is running at low speed;

[0056] S200, when the roller assembly 11 of the ladder chain 10 is detected, the oil nozzle 131 is controlled to move along the extension direction of the ladder chain 10;

[0057] S300, the escalator switches to oil injection mode and stops operating;

[0058] S400, when the roller assembly 11 of the ladder chain 10 is detected again, control the oil nozzle 131 to connect to the oil inlet 13;

[0059] S500, start and add oil.

[0060] Specifically, S200 and S300 can be executed simultaneously. After sensor 141 detects roller assembly 11, the escalator can be immediately switched to oiling mode. After sensor 141 detects roller assembly 11, controller 142 starts to control the first drive component 121 to move, causing the second support 123 to move in a direction parallel to the extension direction of step chain 10. At this time, step chain 10 also decelerates under the action of inertia until it stops. That is, the second support 123 chases the roller assembly 11. After stopping, sensor 141 detects roller assembly 11 of step chain 10 again.

[0061] Furthermore, the controller 142 controls the movement speed of the second support 123 to be less than the low-speed movement speed of the escalator, so that the step chain 10 has stopped moving before the sensor 141 detects the roller assembly 11 of the step chain 10 again. In S200, when the sensor 141 detects that the oil nozzle 131 and the oil inlet 13 are in the same position in a direction parallel to the extension direction of the step chain 10 (that is, when the sensor 141 detects the roller assembly 11 again), the controller 142 controls the first drive member 121 to stop working.

[0062] Specifically, after the ladder chain 10 has stopped moving, when sensor 141 detects the roller assembly 11 again, controller 142 starts controlling the second drive component 122 to move the third support 124 closer to the ladder chain 10, causing the grease nozzle 131 to approach the oil inlet 13 for docking. When sensor 141 detects that the grease nozzle 131 is docked with the oil inlet 13, it executes S500, controlling the oil injection mechanism 130 to start oil injection. Further, controller 142 starts the grease pump 133, injecting a set amount of grease into the oil passage of the ladder chain 10 through the quantitative depressurized grease distributor 132.

[0063] In one embodiment, after the S500 starts the oil injection step, the method further includes:

[0064] S600 After the oil filling is completed, the oil nozzle 131 returns to its initial position;

[0065] S700: The escalator starts and switches to the lubrication waiting mode, and repeats the steps of S200-S400 to detect the roller assembly 11 and control the oil nozzle 131 until the lubrication is completed.

[0066] Specifically, the initial position in S600 is defined as a certain relative position of the second bracket 123 and the third bracket 124 with the first bracket 113 as the coordinate. After each successful oil injection, the controller 142 controls the first drive member 121 and the second drive member 122 to move so that the second bracket 123 and the third bracket 124 return to the above relative position, so that the oil nozzle 131 is reset to the initial position.

[0067] In one embodiment, the number of steps 10 is calculated based on the lifting height of the escalator. Each step 10 has a preset number of oil inlets 13. The number of automatic oiling cycles is set according to the total number of oil inlets 13, that is, the number of times S700 is executed is set.

[0068] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0069] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0070] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0071] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0072] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0073] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An automatic oiling device for the step chain of an escalator, characterized in that, The automatic oiling device includes: a positioning mechanism fixedly installed on one side of the ladder chain; an oiling mechanism disposed on the positioning mechanism, the oiling mechanism including an oil nozzle capable of engaging or disengaging with the oiling port of the ladder chain; and a control mechanism including a sensor and a controller, the sensor being used to detect roller assemblies on the ladder chain, and the controller being used to control the movement of the oil nozzle; when the sensor first detects the roller assembly, the controller controls the oil nozzle to move, and when the sensor detects the roller assembly again, the controller controls the oil nozzle to engage with the oiling port.

2. The automatic oiling device for the escalator step chain according to claim 1, characterized in that, The controller is also used to control the switching of the working state of the escalator. The working state of the escalator includes a waiting-to-lubricate mode and a lubricate mode. When switching to the waiting-to-lubricate mode, the controller controls the escalator to decelerate to a low speed. When the sensor detects the roller assembly for the first time, the controller controls the escalator to switch to the lubricate mode, so that the escalator stops running.

3. The automatic oiling device for the escalator step chain according to claim 1, characterized in that, The positioning mechanism includes a mounting positioning plate, which has multiple positioning holes along the extension direction perpendicular to the ladder chain, and the oil injection mechanism is set according to the positioning holes.

4. The automatic oiling device for the escalator step chain according to claim 1, characterized in that, The automatic oiling device further includes a feeding mechanism, which is movably connected between the positioning mechanism and the oil nozzle. The feeding mechanism can drive the oil nozzle to move along the extension direction of the ladder chain, and can drive the oil nozzle to move closer to or away from the ladder chain.

5. The automatic oiling device for the escalator step chain according to claim 4, characterized in that, The positioning mechanism includes a first bracket, the oil injection mechanism is disposed on the first bracket, the feeding mechanism includes a first driving member, a second driving member, a second bracket and a third bracket, the first driving member is disposed on the first bracket and the driving end of the first driving member is connected to the second bracket, the second driving member is disposed on the second bracket and the driving end of the second driving member is connected to the third bracket, and the oil nozzle is disposed on the third bracket.

6. The automatic oiling device for the escalator step chain according to claim 5, characterized in that, A first bearing is provided between the first bracket and the second bracket, and a second bearing is provided between the third bracket and the second bracket; the edges of the first bracket, the second bracket and / or the third bracket are provided with guide edges.

7. The automatic oiling device for the escalator step chain according to claim 1, characterized in that, The oiling mechanism also includes a grease pump and a grease distributor. The grease nozzle is connected to the grease distributor via a pipeline, and the grease distributor is connected to the grease pump via a pipeline. The grease distributor is used to distribute a fixed amount of grease to the grease nozzle within a set time.

8. An automatic oiling method for escalator step chains, characterized in that, An automatic oiling device for an escalator step chain according to any one of claims 1-7, wherein the automatic oiling method comprises the following steps: the escalator is in a pre-oiling mode and running at low speed; when the roller assembly of the step chain is detected, the oil nozzle is controlled to move along the extension direction of the step chain; the escalator switches to oiling mode and stops running; when the roller assembly of the step chain is detected again, the oil nozzle is controlled to connect to the oiling port; and oiling is started.

9. The automatic oiling method for the escalator step chain according to claim 8, characterized in that, After the oil injection start step, the steps also include: after oil injection is completed, the oil nozzle is reset to the initial position; the escalator is started and switched to the oil injection mode, and the steps of detecting the roller assembly and controlling the oil nozzle are repeated until oil injection is completed.

10. The automatic oiling method for the escalator step chain according to claim 8, characterized in that, The number of escalator chain links is calculated based on the lifting height of the escalator. Each escalator chain link has a preset number of oil injection ports. The number of automatic oil injection cycles is set according to the total number of oil injection ports.

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