Escalator braking distance and step speed monitoring device

Abstract

The utility model belongs to the technical field of escalator safety protection, and particularly discloses an escalator braking distance and step speed monitoring device which comprises a second chain wheel installed at the end of a main driving shaft on an escalator and a tensioning support installed on a truss of the escalator. According to the utility model, through the cooperation of the rotary encoder, the first chain wheel, the second chain wheel and the transmission chain, when the escalator runs, the second chain wheel drives the first chain wheel to rotate through the transmission chain, and the rotary encoder and the first chain wheel are coaxially arranged, so that the rotation of the first chain wheel is not influenced. The rotary encoder is used for collecting the rotation signal of the first chain wheel, so that the monitoring device can monitor the braking distance of a braking system and can also monitor the running speed of the stairs, the sampling frequency of the rotary encoder is high, and the accuracy of monitoring the braking distance of the escalator and the speed of the stairs is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of escalator safety protection, in particular to a device for monitoring the stopping distance and step speed of an escalator. Background Art

[0002] As a fixed power transmission equipment for transporting passengers, escalators are widely used in crowded places such as airports, high-speed railway stations, subway stations and shopping malls, mainly for the purpose of transporting passengers. The GB16899-2011 standard stipulates the braking system and step speed of escalators as follows:

[0003] Braking system: If the stopping distance exceeds 1.2 times the specified maximum value, the escalator should not be restarted until the fault lock is reset. Therefore, based on the above regulations, the escalator should be equipped with a stopping distance monitoring device.

[0004] Overspeed protection: The escalator should automatically stop running before the speed exceeds 1.2 times the nominal speed. Therefore, based on the above regulations, the escalator should be equipped with a step speed monitoring device.

[0005] At present, the step speed monitoring method of escalator is usually realized by speed sensor, which can accurately capture the real-time movement speed of the steps. The stopping distance refers to the distance traveled from the beginning of the brake to the complete stop of the escalator steps, which is usually calculated based on the running speed, load status and braking system performance of the escalator. However, since the speed sensor is affected by its own accuracy, it is not easy to accurately capture subtle speed changes and position changes, resulting in low accuracy in monitoring the stopping distance and step speed of the escalator. Therefore, we need to propose an escalator stopping distance and step speed monitoring device to solve the above-mentioned problems, so that it can monitor both the stopping distance of the braking system and the running speed of the steps to improve the monitoring accuracy. Utility Model Content

[0006] The purpose of the utility model is to provide an escalator stopping distance and step speed monitoring device, which can monitor the stopping distance of the braking system and the running speed of the steps, improve the monitoring accuracy, and solve the problems raised in the background technology.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an escalator stopping distance and step speed monitoring device, comprising a second sprocket installed on the end of the main driving shaft of the escalator and a tensioning bracket installed on the escalator truss, the tensioning bracket is installed with a mounting bracket, and the mounting bracket is respectively installed with a first sprocket and a rotary encoder, the first sprocket and the second sprocket are connected by a transmission chain, the rotating shaft of the rotary encoder is connected to the middle part of the first sprocket, and the first sprocket and the rotary encoder are coaxially arranged.

[0008] Preferably, the cross section of the tensioning bracket is L-shaped, one end of the tensioning bracket is provided with a through hole for installation with the escalator truss, and the other end of the tensioning bracket is connected to the mounting bracket by bolts.

[0009] Preferably, the cross-section of the mounting bracket is C-shaped, a rotating shaft is rotatably mounted in the middle of the mounting bracket, the first sprocket is sleeved on the rotating shaft, and one end of the rotating shaft is connected to the rotating shaft of the rotary encoder through a connecting block.

[0010] Preferably, the connecting block is cylindrical, and the outer wall of one end of the rotating shaft of the rotary encoder and the outer wall of one end of the rotating shaft are integrally formed with protrusions. The two ends of the connecting block are respectively provided with sockets for inserting one end of the rotating shaft of the rotary encoder and one end of the rotating shaft, and the side walls of the sockets are provided with limiting grooves for the protrusions to enter.

[0011] Preferably, one end of the mounting bracket is provided with a screw hole for connection with the tensioning bracket, and the other end of the mounting bracket is detachably connected to a support plate by bolts, and the rotary encoder is mounted on the support plate.

[0012] Preferably, the second sprocket is configured as an integral sprocket or a split sprocket.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The utility model cooperates with a rotary encoder, a first sprocket, a second sprocket and a transmission chain. When the escalator is running, the main drive shaft on the escalator is driven to rotate by the driving main machine, the main drive shaft drives the second sprocket to rotate, and the second sprocket drives the first sprocket to rotate by the transmission chain. Since the rotary encoder and the first sprocket are coaxially arranged, the rotary encoder is used to collect the rotation signal of the first sprocket, so that the monitoring device can monitor the stopping distance of the braking system and the running speed of the steps. The sampling frequency of the rotary encoder is high, which improves the accuracy of monitoring the stopping distance and step speed of the escalator to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1This is a schematic diagram of the three-dimensional structure of the utility model when it is installed;

[0016] Figure 2 This is a schematic diagram of the side structure of the utility model when it is installed;

[0017] Figure 3 For this utility model Figure 2 Schematic diagram of the cross-section structure in the A direction;

[0018] Figure 4 For this utility model Figure 2 Schematic diagram of the cross-sectional structure in the B direction;

[0019] Figure 5 It is a side view structural schematic diagram of the utility model;

[0020] Figure 6 This is a flow chart of the escalator stopping distance monitoring of the utility model;

[0021] Figure 7 This is a flow chart of the escalator step speed monitoring of the utility model.

[0022] In the figure: 1. rotary encoder; 2. mounting bracket; 3. first sprocket; 4. tensioning bracket; 5. transmission chain; 6. second sprocket; 7. main drive shaft; 8. driving host; 9. connecting block; 10. support plate. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-7 The utility model provides a technical solution: an escalator stopping distance and step speed monitoring device, comprising a second sprocket 6 installed at the end of a main driving shaft 7 on the escalator and a tensioning bracket 4 installed on the escalator truss, the tensioning bracket 4 is installed with a mounting bracket 2, the mounting bracket 2 is respectively installed with a first sprocket 3 and a rotary encoder 1, the first sprocket 3 and the second sprocket 6 are connected by a transmission chain 5, the rotating shaft of the rotary encoder 1 is connected to the middle of the first sprocket 3, and the first sprocket 3 and the rotary encoder 1 are coaxially arranged, and the second sprocket 6 is arranged as an integral sprocket or a split sprocket;

[0025] The main drive shaft 7 on the escalator is driven to rotate by the driving main unit 8, and the main drive shaft 7 drives the second sprocket 6 to rotate. The second sprocket 6 drives the first sprocket 3 to rotate by the transmission chain 5. Since the rotary encoder 1 and the first sprocket 3 are coaxially arranged, the rotary encoder 1 is used to collect the rotation signal of the first sprocket 3, so that the monitoring device can monitor the stopping distance of the braking system and the running speed of the steps. Compared with most of the proximity sensors used, the use of the rotary encoder 1 has a higher sampling frequency and higher monitoring accuracy, which improves the accuracy of monitoring the stopping distance and step speed of the escalator to a certain extent.

[0026] Specifically, in the monitoring of the stopping distance of the escalator:

[0027] like Figure 6 As shown in the figure, when the escalator stops, the control system detects the stop signal and counts the output pulses of the rotary encoder 1. The number of pulses is proportional to the stop distance. The number of pulses corresponding to 1.2 times the maximum stop distance is taken as the reference upper limit value. If the number of pulses counted by the control system exceeds the reference upper limit value, it means that the stop distance at this time has exceeded 1.2 times the maximum value specified by the standard. At this time, the escalator fault is locked to prevent the escalator from starting with a fault. It can only be restarted after the fault is eliminated and reset.

[0028] Escalator step speed monitoring:

[0029] like Figure 7 As shown, when the escalator is running, the control system monitors the number of output pulses of the rotary encoder 1 per unit time in real time, and the number of pulses is proportional to the speed of the escalator. The number of pulses per unit time corresponding to a speed slightly less than 1.2 (for example, 1.18) times the nominal speed is taken as the reference upper limit value. If the number of pulses per unit time monitored by the control system is greater than or equal to the reference upper limit value, it means that the speed at this time is close to 1.2 times the nominal speed. At this time, the escalator automatically stops running to ensure the safety of passengers.

[0030] The cross-section of the tensioning bracket 4 is L-shaped, and one end of the tensioning bracket 4 is provided with a through hole for installation with the escalator truss. The other end of the tensioning bracket 4 is connected to the mounting bracket 2 by bolts, so that the tensioning bracket 4 and the escalator truss are detachable, which facilitates the installation of the tensioning bracket 4.

[0031] The cross-section of the mounting bracket 2 is C-shaped, and a rotating shaft is rotatably installed in the middle of the mounting bracket 2. The first sprocket 3 is sleeved on the rotating shaft, and one end of the rotating shaft is connected to the rotating shaft of the rotary encoder 1 through a connecting block 9. The first sprocket 3 is supported by the mounting bracket 2, and the tensioning bracket 4 is used to provide supporting force for the mounting bracket 2, so that the first sprocket 3 can be driven to rotate synchronously through the second sprocket 6, so that the rotation signal and stop signal of the first sprocket 3 can be monitored in real time by using the rotary encoder 1.

[0032] The connecting block 9 is cylindrical, and the outer wall of one end of the rotating shaft of the rotary encoder 1 and the outer wall of one end of the rotating shaft are integrally formed with a protrusion. The two ends of the connecting block 9 are respectively provided with a socket for inserting one end of the rotating shaft of the rotary encoder 1 and one end of the rotating shaft, and the side wall of the socket is provided with a limiting groove for the protrusion to enter. By using the connecting block 9 and utilizing the restrictions of the protrusion and the limiting groove, it can be ensured that the connecting block 9 can rotate synchronously with the rotating shaft and the rotating shaft of the rotary encoder 1, thereby improving the accuracy of monitoring of the rotary encoder 1.

[0033] One end of the mounting bracket 2 is provided with a screw hole for connection with the tensioning bracket 4, and the other end of the mounting bracket 2 is detachably connected to the support plate 10 by bolts. The rotary encoder 1 is mounted on the support plate 10, so that the tensioning bracket 4, the support plate 10 and the mounting bracket 2 are all detachably arranged, which facilitates the installation of the mounting bracket 2 and the tensioning bracket 4 and the installation of the support plate 10 and the mounting bracket 2, thereby facilitating the connection of the rotary encoder 1 with the first sprocket 3.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An escalator stopping distance and step speed monitoring device, characterized in that: The invention comprises a second sprocket (6) mounted on the end of a main drive shaft (7) on an escalator and a tensioning bracket (4) mounted on a truss of the escalator, wherein a mounting bracket (2) is mounted on the tensioning bracket (4), and a first sprocket (3) and a rotary encoder (1) are respectively mounted on the mounting bracket (2), wherein the first sprocket (3) and the second sprocket (6) are connected in transmission via a transmission chain (5), the rotating shaft of the rotary encoder (1) is connected to the middle of the first sprocket (3), and the first sprocket (3) and the rotary encoder (1) are coaxially arranged.

2. The escalator stopping distance and step speed monitoring device according to claim 1, characterized in that: The cross section of the tensioning bracket (4) is L-shaped, one end of the tensioning bracket (4) is provided with a through hole for installation with the escalator truss, and the other end of the tensioning bracket (4) is connected to the installation bracket (2) by means of bolts.

3. The escalator stopping distance and step speed monitoring device according to claim 2, characterized in that: The cross section of the mounting bracket (2) is C-shaped, a rotating shaft is rotatably mounted in the middle of the mounting bracket (2), the first sprocket (3) is sleeved on the rotating shaft, and one end of the rotating shaft is connected to the rotating shaft of the rotary encoder (1) via a connecting block (9).

4. The escalator stopping distance and step speed monitoring device according to claim 3, characterized in that: The connecting block (9) is cylindrical, and the outer wall of one end of the rotating shaft of the rotary encoder (1) and the outer wall of one end of the rotating shaft are integrally formed with protrusions. Both ends of the connecting block (9) are respectively provided with insertion holes for inserting one end of the rotating shaft of the rotary encoder (1) and one end of the rotating shaft, and the side walls of the insertion holes are provided with limiting grooves for the protrusions to enter.

5. The escalator stopping distance and step speed monitoring device according to claim 4, characterized in that: One end of the mounting bracket (2) is provided with a screw hole for connection with the tensioning bracket (4), and the other end of the mounting bracket (2) is detachably connected to a support plate (10) via bolts, and the rotary encoder (1) is mounted on the support plate (10).

6. The escalator stopping distance and step speed monitoring device according to claim 5, characterized in that: The second sprocket (6) is configured as an integral sprocket or a split sprocket.

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