Escalator drive sprocket running status detection device

Abstract

The present invention discloses a device for detecting the running state of an escalator driving sprocket, comprising: a gear plate, coaxially mounted on the driving sprocket of the escalator, and having gear teeth formed on its inner circumference; a sensor, arranged near the inner circumference of the gear plate, suitable for detecting the distance change between the sensor and the inner circumference of the gear plate and generating and outputting a detection signal representing the distance change; and a micro-central processing unit, comprising a speed calculation unit, the speed calculation unit being suitable for calculating the rotation speed of the driving sprocket according to the following formula: n=60*F / m, wherein n is the rotation speed of the driving sprocket, F is the frequency of the detection signal detected by the sensor, and m is the number of gear teeth on the gear plate. In the present invention, since the gear plate used for speed detection is independent of the sprocket, the gear plate can be replaced alone without replacing the entire sprocket, thereby saving costs.

Description

Technical Field

[0001] The invention relates to a device for detecting the running state of an escalator driving sprocket, and in particular to a device for detecting the rotation speed, acceleration and direction of the escalator driving sprocket. Background Art

[0002] The latest technical specification for subway escalators, CEA standard, the detection of escalator overspeed and non-operation reversal should directly measure the step speed or the rotation speed of the main drive shaft or the sprocket assembled on the main drive shaft to determine the actual operating speed and direction of the escalator.

[0003] Patent document WO2018108560A1 discloses a detection device suitable for directly detecting the rotation speed of a sprocket. However, in the patent document, the gear teeth for speed detection are directly formed on the inner circumference of the sprocket, which makes it impossible to change the number of gear teeth according to the actual speed detection accuracy. If the speed detection accuracy is to be improved, the entire sprocket can only be replaced, which will result in great waste because the manufacturing cost of the sprocket is very high.

[0004] In addition, in the aforementioned patent document, two non-contact electromagnetic sensors are used to detect the operation of the gear teeth on the sprocket. In actual use, dust and oil will adhere to the gear teeth and tooth grooves on the sprocket, and the detection accuracy of the non-contact electromagnetic sensor will be affected by the dust and oil, thereby reducing the detection accuracy. Summary of the invention

[0005] The purpose of the present invention is to solve at least one aspect of the above-mentioned problems and defects in the prior art.

[0006] According to one aspect of the present invention, there is provided an escalator drive sprocket operation state detection device, comprising: a gear plate, coaxially mounted on the escalator drive sprocket, having gear teeth formed on its inner circumference; a sensor, arranged near the inner circumference of the gear plate, adapted to detect a distance change between the sensor and the inner circumference of the gear plate and to generate and output a detection signal representing the distance change; and a micro-central processing unit, comprising a speed calculation unit, the speed calculation unit being adapted to calculate the rotation speed of the drive sprocket according to the following formula (1):

[0007] n=60*F / m (1), where

[0008] n is the speed of the driving sprocket in rpm,

[0009] F is the frequency of the detection signal detected by the sensor, in Hz,

[0010] m is the number of teeth on the gear plate.

[0011] According to an exemplary embodiment of the present invention, the number of gear teeth on the gear plate is not less than 400.

[0012] According to another exemplary embodiment of the present invention, the gear teeth and the tooth grooves between adjacent gear teeth extend along the axial direction of the gear plate.

[0013] According to another exemplary embodiment of the present invention, the width of the gear teeth is equal to or greater than the width of the tooth grooves.

[0014] According to another exemplary embodiment of the present invention, the width of the gear teeth and the tooth grooves is in the range of 0.5 mm to 3.5 mm.

[0015] According to another exemplary embodiment of the present invention, the width of the gear teeth and the tooth grooves is equal to 0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm or 3.5 mm.

[0016] According to another exemplary embodiment of the present invention, the diameter of the gear plate is smaller than the diameter of the driving sprocket, and is suitable for being detachably mounted on the end surface of the driving sprocket.

[0017] According to another exemplary embodiment of the present invention, a connecting hole is formed on the end surface of the gear plate, and the gear plate is suitable for being threadedly connected to the end surface of the driving sprocket by a threaded connector passing through the connecting hole.

[0018] According to another exemplary embodiment of the present invention, the micro-CPU further includes an acceleration calculation unit, and the acceleration calculation unit is suitable for calculating the acceleration of the driving sprocket according to the rotation speed calculated by the speed calculation unit.

[0019] According to another exemplary embodiment of the present invention, the sensor includes a single dual-channel Hall sensor, and the dual-channel Hall sensor has a first detection channel and a second detection channel that are independent of each other, the first detection channel is used to generate and output a first detection signal, and the second detection channel is used to generate and output a second detection signal.

[0020] According to another exemplary embodiment of the present invention, there is a predetermined phase difference between the first detection signal and the second detection signal; the micro-CPU is suitable for calculating the rotation direction of the driving sprocket according to the phase relationship between the first detection signal and the second detection signal.

[0021] According to another exemplary embodiment of the present invention, the sensor may include two inductive sensors, one of the two inductive sensors is used to generate and output a first detection signal, and the other of the two inductive sensors is used to generate and output a second detection signal.

[0022] According to another exemplary embodiment of the present invention, the diameter of each of the electric induction sensors is no greater than 5 mm.

[0023] According to another exemplary embodiment of the present invention, there is a predetermined phase difference between the first detection signal and the second detection signal; the micro-CPU is suitable for calculating the rotation direction of the driving sprocket according to the phase relationship between the first detection signal and the second detection signal.

[0024] According to another exemplary embodiment of the present invention, the escalator drive sprocket operating status detection device also includes a signal processing circuit, which is suitable for receiving the detection signal output by the sensor and processing the received detection signal; the micro central processing unit communicates with the signal processing circuit and is suitable for receiving the detection signal processed by the signal processing circuit.

[0025] According to another exemplary embodiment of the present invention, the micro-CPU further includes an overspeed judgment unit, which is adapted to judge whether the speed calculated by the speed calculation unit is higher than the maximum rotational speed allowed by the drive sprocket; when the overspeed judgment unit determines that the speed calculated by the speed calculation unit is higher than the maximum rotational speed allowed by the drive sprocket, the micro-CPU sends an overspeed safety control signal to the safety control circuit of the escalator, and the safety control circuit starts the elevator stop protection device according to the overspeed safety control signal.

[0026] According to another exemplary embodiment of the present invention, the micro-CPU further includes an underspeed judgment unit, which is adapted to judge whether the speed calculated by the speed calculation unit is lower than the minimum rotational speed allowed by the drive sprocket; when the underspeed judgment unit determines that the speed calculated by the speed calculation unit is lower than the minimum rotational speed allowed by the drive sprocket, the micro-CPU sends an underspeed safety control signal to the safety control circuit of the escalator, and the safety control circuit starts the elevator stop protection device according to the underspeed safety control signal.

[0027] According to another exemplary embodiment of the present invention, the micro-CPU also includes a direction judgment unit, which is suitable for judging whether the calculated rotation direction is a normal positive rotation direction; when the direction judgment unit determines that the calculated rotation direction is an abnormal reverse rotation direction, the micro-CPU sends a reverse safety control signal to the escalator's safety control circuit, and the safety control circuit starts the elevator stop protection device according to the reverse safety control signal.

[0028] In the aforementioned various exemplary embodiments according to the present invention, the gear plate used for speed detection is independent of the sprocket. Therefore, the gear plate can be replaced alone without replacing the entire sprocket, thereby saving costs.

[0029] In addition, in some of the above exemplary embodiments of the present invention, a dual-channel Hall sensor is used to detect the operation of the gear plate. Since the dual-channel Hall sensor is not affected by dust and oil, the detection accuracy can be improved.

[0030] Other objects and advantages of the present invention will become apparent from the following description of the present invention with reference to the accompanying drawings, which will help to provide a comprehensive understanding of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A three-dimensional schematic diagram showing an escalator drive sprocket operating state detection device according to an exemplary embodiment of the present invention;

[0032] Figure 2 show Figure 1 Schematic diagram of the gear plate in FIG.

[0033] Figure 3 show Figure 2 A partial enlarged schematic diagram of the gear plate in FIG.

[0034] Figure 4 show Figure 1 Two detection signals output by the sensor in;

[0035] Figure 5 A functional block diagram showing the processing and calculation of the detection signal. DETAILED DESCRIPTION

[0036] The technical solution of the present invention is further specifically described below by examples and in conjunction with the accompanying drawings. In the specification, the same or similar reference numerals indicate the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the overall inventive concept of the present invention and should not be construed as a limitation of the present invention.

[0037] In addition, in the detailed description below, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the disclosed embodiments. However, it is apparent that one or more embodiments may be implemented without these specific details. In other cases, known structures and devices are embodied in a schematic manner to simplify the accompanying drawings.

[0038] According to an overall technical concept of the present invention, there is provided a device for detecting the operating state of an escalator drive sprocket, comprising: a gear plate coaxially mounted on the drive sprocket of the escalator, having gear teeth formed on its inner circumference; a sensor disposed near the inner circumference of the gear plate, suitable for detecting a change in the distance between the sensor and the inner circumference of the gear plate and generating and outputting a detection signal representing the change in the distance; and a micro-central processing unit comprising a speed calculation unit, wherein the speed calculation unit is suitable for calculating the rotational speed of the drive sprocket according to the following formula: n=60*F / m, wherein n is the rotational speed of the drive sprocket, F is the frequency of the detection signal detected by the sensor, and m is the number of gear teeth on the gear plate.

[0039] Figure 1 A three-dimensional schematic diagram showing an escalator drive sprocket operating state detection device according to an exemplary embodiment of the present invention; Figure 5 A functional block diagram showing the processing and calculation of the detection signal.

[0040] like Figure 1 and Figure 5 As shown, in the illustrated embodiment, the escalator drive sprocket operating state detection device mainly includes: a gear plate 100, a sensor 300 and a micro central processing unit 500.

[0041] Figure 2 show Figure 1 Schematic diagram of the gear plate 100 in FIG. Figure 3 show Figure 2 A partial enlarged schematic diagram of the gear plate 100 in FIG. Figure 4 show Figure 1 The two detection signals output by the sensor in.

[0042] like Figures 1 to 5 As shown, in the illustrated embodiment, the gear plate 100 is coaxially mounted on the driving sprocket 200 of the escalator and has gear teeth 110 formed on its inner circumference. The sensor 300 is arranged near the inner circumference of the gear plate 100, and is suitable for detecting the distance change between the sensor 300 and the inner circumference of the gear plate 100 and generating and outputting detection signals A and B representing the distance change. The micro-CPU 500 includes a speed calculation unit, which is suitable for calculating the rotation speed of the driving sprocket 200 according to the following formula (1):

[0043] n=60*F / m (1), where

[0044] n is the speed of the driving sprocket in rpm,

[0045] F is the frequency of the detection signal detected by the sensor, in Hz,

[0046] m is the number of teeth on the gear plate.

[0047] like Figures 1 to 5 As shown, in the illustrated embodiment, when the driving sprocket 200 rotates, the gear plate 100 rotates together with the driving sprocket 200. Since the distances from the gear teeth 110 and the tooth grooves 120 on the gear plate 100 to the sensor 300 are different, the distance between the sensor 300 and the gear plate 100 will continuously change when the gear plate 100 rotates. The sensor 300 is adapted to generate and output detection signals A and B representing the distance change.

[0048] In order to improve the detection accuracy of the rotation speed of the driving sprocket 200, in an exemplary embodiment of the present invention, the number of the gear teeth 110 on the gear plate 100 is not less than 400. For example, the number of the gear teeth 110 on the gear plate 100 may be 500, 600 or more.

[0049] like Figures 1 to 3 As shown, in the illustrated embodiment, the gear teeth 110 and the tooth grooves 120 extend on the inner circumferential surface of the gear plate 100 along the axial direction of the gear plate 100 .

[0050] In an exemplary embodiment of the present invention, the width W1 of the gear teeth 110 may be equal to or different from the width W2 of the tooth grooves 120. However, the width W1 of all the gear teeth 110 is the same, and the width W2 of all the tooth grooves 120 is also the same.

[0051] like Figures 1 to 3 As shown, in the illustrated embodiment, the width of the gear teeth 110 and the tooth grooves 120 may be within the range of 0.5 mm to 3.5 mm.

[0052] like Figures 1 to 3 As shown, in the illustrated embodiment, the width of the gear teeth 110 and the tooth grooves 120 may be equal to 0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, or 3.5 mm.

[0053] like Figures 1 to 3 As shown, in the illustrated embodiment, the diameter of the gear plate 100 is smaller than the diameter of the driving sprocket 200 and is suitable for being detachably mounted on the end surface of the driving sprocket 200 .

[0054] like Figures 1 to 3 As shown, in the illustrated embodiment, a connecting hole 101 is formed on the end surface of the gear plate 100 , and the gear plate 100 is suitable for being threadedly connected to the end surface of the driving sprocket 200 by a threaded connection member (eg, a screw) passing through the connecting hole 101 .

[0055] like Figures 1 to 5As shown, in the illustrated embodiment, the micro-CPU 500 further includes an acceleration calculation unit, which is suitable for calculating the acceleration of the driving sprocket 200 according to the rotation speed calculated by the speed calculation unit.

[0056] like Figures 1 to 5 As shown, in the illustrated embodiment, the sensor 300 may include a single dual-channel Hall sensor having a first detection channel and a second detection channel that are independent of each other. The first detection channel is used to generate and output a first detection signal A, and the second detection channel is used to generate and output a second detection signal B.

[0057] Please note that the sensor 300 of the present invention is not limited to the illustrated embodiment. For example, in another embodiment of the present invention, the sensor 300 may include two separate inductive sensors, one of which is used to generate and output a first detection signal A, and the other is used to generate and output a second detection signal B.

[0058] The accuracy of this inductive sensor is basically the same as that of the aforementioned Hall sensor, and it can realize speed detection of the gear plate 100 with high-density gear teeth 110. Its response frequency reaches 3000Hz. At the same time, it has no magnetic characteristics of its own and is more suitable for high-demand environments (waterproof, oil-proof, dust-proof, and anti-ferromagnetic interference), especially anti-ferromagnetic materials. In escalator applications, there are some metal shavings (such as iron shavings or iron powder) around. For the Hall sensor, they will be adsorbed to the surface of the sensor, which will affect the accuracy of speed signal detection.

[0059] In an exemplary embodiment of the present invention, the diameter of the aforementioned inductive sensor is very small (usually not more than 5 mm, for example, the diameter of the aforementioned inductive sensor may be 5 mm, 4 mm or 3 mm), so that the high-density arranged gear teeth 110 on the gear plate 100 can be detected.

[0060] like Figures 1 to 5 As shown, in the illustrated embodiment, there is a predetermined phase difference between the first detection signal A and the second detection signal B; the micro-CPU 500 is adapted to calculate the rotation direction of the driving sprocket 200 according to the phase relationship between the first detection signal A and the second detection signal B. For example, Figure 4 As shown, when the driving sprocket 200 rotates in the normal forward direction, the rising edge of the second detection signal B leads the rising edge of the first detection signal A by a predetermined phase difference. On the contrary, if the driving sprocket 200 rotates in the abnormal reverse direction, the rising edge of the first detection signal A leads the rising edge of the second detection signal B by a predetermined phase difference. In this way, the actual rotation direction of the driving sprocket 200 can be calculated.

[0061] like Figures 1 to 5As shown, in the illustrated embodiment, the escalator drive sprocket operating status detection device also includes a signal processing circuit 400, which is suitable for receiving the detection signals A and B output by the sensor 300 and processing the received detection signals A and B; the micro central processing unit 500 communicates with the signal processing circuit 400 and is suitable for receiving the detection signals A and B processed by the signal processing circuit 400.

[0062] like Figures 1 to 5 As shown, in the illustrated embodiment, the micro-CPU 500 further includes an overspeed determination unit, which is adapted to determine whether the speed calculated by the speed calculation unit is higher than the maximum rotational speed allowed by the drive sprocket 200; when the overspeed determination unit determines that the speed calculated by the speed calculation unit is higher than the maximum rotational speed allowed by the drive sprocket 200, the micro-CPU 500 sends an overspeed safety control signal to the escalator safety control circuit 600, and the safety control circuit 600 starts the elevator stop protection device according to the overspeed safety control signal.

[0063] like Figures 1 to 5 As shown, in the illustrated embodiment, the micro-CPU 500 further includes an underspeed judgment unit, which is adapted to judge whether the speed calculated by the speed calculation unit is lower than the minimum rotation speed allowed by the drive sprocket 200; when the underspeed judgment unit determines that the speed calculated by the speed calculation unit is lower than the minimum rotation speed allowed by the drive sprocket 200, the micro-CPU 500 sends an underspeed safety control signal to the safety control circuit 600 of the escalator, and the safety control circuit 600 starts the elevator stop protection device according to the underspeed safety control signal.

[0064] like Figures 1 to 5 As shown, in the illustrated embodiment, the micro-CPU 500 also includes a direction judgment unit, which is suitable for judging whether the calculated rotation direction is a normal positive rotation direction; when the direction judgment unit determines that the calculated rotation direction is an abnormal reverse rotation direction, the micro-CPU 500 sends a reverse safety control signal to the escalator safety control circuit 600, and the safety control circuit 600 starts the elevator stop protection device according to the reverse safety control signal.

[0065] In an exemplary embodiment of the present invention, a fixed bracket (not shown) may be provided on the truss of the escalator, and the sensor 300 may be installed on the fixed bracket.

[0066] In an exemplary embodiment of the present invention, the signal processing circuit 400 is suitable for filtering out high-frequency interference signals, protecting input signals from overvoltage, and converting their voltages.

[0067] Those skilled in the art can understand that the embodiments described above are exemplary and can be improved by those skilled in the art. The structures described in various embodiments can be freely combined without causing conflicts in structure or principle.

[0068] Although the present invention has been described in conjunction with the accompanying drawings, the embodiments disclosed in the accompanying drawings are intended to exemplify the preferred implementations of the present invention and should not be construed as limiting the present invention.

[0069] Although some embodiments of the present general inventive concept have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the present general inventive concept, the scope of which is defined by the claims and their equivalents.

[0070] It should be noted that the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. In addition, any element reference signs in the claims shall not be construed as limiting the scope of the present invention.

Claims

1. An escalator drive sprocket running state detection device, characterized in that: include: A gear plate (100) is coaxially mounted on a driving sprocket (200) of the escalator and has gear teeth (110) formed on its inner circumference and tooth grooves (120) between adjacent gear teeth (110); A sensor (300) is arranged near the inner circumference of the gear plate (100) and at different distances from the gear teeth (110) and the tooth grooves (120), so as to be suitable for detecting a change in the distance between the sensor (300) and the inner circumference of the gear plate (100), and generating and outputting a first detection signal (A) and a second detection signal (B) indicating the change in the distance, respectively; and The micro-CPU (500) comprises a speed calculation unit, wherein the speed calculation unit is adapted to calculate the rotation speed of the driving sprocket (200) according to the following formula (1), n = 60*F / m(1), where n is the speed of the driving sprocket in rpm, F is the frequency of the first detection signal (A) or the second detection signal (B) detected by the sensor, in Hz, m is the number of teeth on the gear plate.

2. The escalator drive sprocket operating state detection device according to claim 1, characterized in that: The number of the gear teeth (110) on the gear plate (100) is not less than 400.

3. The escalator drive sprocket running state detection device according to claim 1, characterized in that: The gear teeth (110) and the tooth grooves (120) extend along the axial direction of the gear plate (100).

4. The escalator drive sprocket operating state detection device according to claim 3, characterized in that: The width of the gear teeth (110) is equal to or greater than the width of the tooth groove (120).

5. The escalator drive sprocket operating state detection device according to claim 3, characterized in that: The width of the gear teeth (110) and the tooth grooves (120) is within the range of 0.5 mm to 3.5 mm.

6. The escalator drive sprocket running state detection device according to claim 3, characterized in that: The width of the gear teeth (110) and the tooth grooves (120) is equal to 0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm or 3.5 mm.

7. The escalator drive sprocket operating state detection device according to claim 1, characterized in that: The diameter of the gear plate (100) is smaller than the diameter of the driving sprocket (200), and is suitable for being detachably mounted on the end surface of the driving sprocket (200).

8. The escalator drive sprocket operating state detection device according to claim 7, characterized in that: A connection hole (101) is formed on the end surface of the gear plate (100), and the gear plate (100) is suitable for being threadedly connected to the end surface of the driving sprocket (200) through a threaded connection member passing through the connection hole (101).

9. The escalator drive sprocket running state detection device according to claim 1, characterized in that: The micro-CPU (500) further comprises an acceleration calculation unit, wherein the acceleration calculation unit is adapted to calculate the acceleration of the driving sprocket (200) according to the rotation speed calculated by the speed calculation unit.

10. The escalator drive sprocket running state detection device according to claim 1, characterized in that: The sensor (300) comprises a single dual-channel Hall sensor having a first detection channel and a second detection channel which are independent of each other. The first detection channel is used to generate and output a first detection signal (A), and the second detection channel is used to generate and output a second detection signal (B).

11. The escalator drive sprocket running state detection device according to claim 10, characterized in that: There is a predetermined phase difference between the first detection signal (A) and the second detection signal (B); The micro-CPU (500) is adapted to calculate the rotation direction of the driving sprocket (200) according to the phase relationship between the first detection signal (A) and the second detection signal (B).

12. The escalator drive sprocket running state detection device according to claim 1, characterized in that: The sensor (300) comprises two electric induction sensors, one of which is used to generate and output a first detection signal (A), and the other of which is used to generate and output a second detection signal (B).

13. The escalator drive sprocket running state detection device according to claim 12, characterized in that: The diameter of each of the electric induction sensors is no greater than 5 mm.

14. The escalator drive sprocket running state detection device according to claim 12, characterized in that: There is a predetermined phase difference between the first detection signal (A) and the second detection signal (B); The micro-CPU (500) is adapted to calculate the rotation direction of the driving sprocket (200) according to the phase relationship between the first detection signal (A) and the second detection signal (B).

15. The escalator drive sprocket running state detection device according to claim 1, characterized in that: The escalator drive sprocket running state detection device further comprises a signal processing circuit (400), wherein the signal processing circuit (400) is adapted to receive the detection signal (A, B) output by the sensor (300) and process the received detection signal (A, B); The micro central processing unit (500) communicates with the signal processing circuit (400) and is suitable for receiving the detection signal (A, B) processed by the signal processing circuit (400).

16. The escalator drive sprocket running state detection device according to claim 1, characterized in that: The micro-CPU (500) further comprises an overspeed determination unit, wherein the overspeed determination unit is adapted to determine whether the speed calculated by the speed calculation unit is higher than the maximum speed allowed by the drive sprocket (200); When the overspeed judgment unit determines that the speed calculated by the speed calculation unit is higher than the maximum speed allowed by the drive sprocket (200), the micro central processing unit (500) sends an overspeed safety control signal to the escalator safety control circuit (600), and the safety control circuit (600) starts the elevator stop protection device according to the overspeed safety control signal.

17. The escalator drive sprocket running state detection device according to claim 1, characterized in that: The micro-CPU (500) further comprises an underspeed determination unit, wherein the underspeed determination unit is adapted to determine whether the speed calculated by the speed calculation unit is lower than the minimum speed allowed by the drive sprocket (200); When the underspeed judgment unit determines that the speed calculated by the speed calculation unit is lower than the minimum speed allowed by the drive sprocket (200), the micro-central processing unit (500) sends an underspeed safety control signal to the escalator safety control circuit (600), and the safety control circuit (600) starts the elevator stop protection device according to the underspeed safety control signal.

18. The escalator drive sprocket running state detection device according to claim 11 or 14, characterized in that: The micro-CPU (500) further comprises a direction determination unit, wherein the direction determination unit is adapted to determine whether the calculated rotation direction is a normal positive rotation direction; When the direction determination unit determines that the calculated rotation direction is an abnormal reverse rotation direction, the micro central processing unit (500) sends a reverse safety control signal to the escalator safety control circuit (600), and the safety control circuit (600) starts the elevator stop protection device according to the reverse safety control signal.

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