Traveling cable swing amplitude detection system and method

Abstract

The present invention proposes a system and method for detecting the swing amplitude of a traveling cable, aiming at realizing a measurement scheme with simple structure, accuracy and low cost. The system comprises at least one photoelectric detection module arranged longitudinally along the shaft below the lowest cable fixing frame; a microcomputer system for connecting each photoelectric detection module to obtain the swing amplitude value of each detection point; the method comprises a swing threshold setting step, wherein the elevator car is operated to the lowest floor, and the traveling cable is shaken to make it swing with a maximum lateral swing amplitude Amax; the swing amplitude An of the traveling cable facing the photoelectric detection module is obtained; the corresponding maximum swing amplitude angle Bn is obtained according to the swing amplitude An and the distance Dn; the average value B of each maximum swing amplitude angle Bn is taken. mean As the swing threshold; the swing detection step, the swing An is obtained in real time through the photoelectric detection module, and then the current swing angle Cn is calculated; the over-limit judgment alarm step, when the current swing angle Cn is greater than or equal to the swing threshold B mean When the alarm occurs, report it.

Description

Technical Field

[0001] The invention is applied to the field of elevators, and in particular relates to a system and method for detecting the swing amplitude of a traveling cable. Background Art

[0002] At present, there are many super-high buildings in cities. When the wind speed is too high or an earthquake occurs, these buildings will sway laterally, and the elevators in the buildings will also sway with them. When the swing reaches a certain level, it may cause damage to the equipment, especially the elevator's accompanying cables.

[0003] The traveling cable is hung at the bottom of the elevator car, and the other end is fixed in the middle of the hoistway. When the elevator is running, the traveling cable moves with the elevator. Because the cable has inertia, the swing of the traveling cable will be greater when the building swings. If it exceeds a certain amplitude, the cable may be hung up by the mechanical equipment around the hoistway, which will bring great economic losses and may endanger the safety of passengers.

[0004] In the prior art, there is a solution that uses an accelerometer to estimate the swing amplitude of the accompanying cable. The accelerometer is installed on the top of the elevator building. The cable swing is estimated by testing the swing of the building. This does not provide a good feedback on the actual swing amplitude of the cable. In addition, the output of the accelerometer is acceleration, which requires a series of calculations and processing to be fed back as the swing amplitude of the cable. There is no direct relationship between these data and the swing amplitude, so a lot of experiments are needed to verify and adjust. The actual effect after installation requires a long period of testing and inspection. Summary of the invention

[0005] In order to overcome the problems existing in the prior art, the present invention proposes a system and method for detecting the swing amplitude of a traveling cable, the purpose of which is to achieve a measurement scheme with simple structure, accuracy and low cost. The specific technical contents are as follows:

[0006] The accompanying cable swing amplitude detection system of the present invention comprises:

[0007] At least one photoelectric detection module is arranged longitudinally along the shaft below the lowermost cable fixing frame;

[0008] A microcomputer system connected to each photoelectric detection module to obtain the swing amplitude value of each detection point;

[0009] The photoelectric detection module includes a row of light emitting tubes and a row of light receiving tubes arranged at equal intervals, and a microprocessor. The microprocessor obtains the effective number of light receiving tubes to calculate the swing value of the accompanying cable it is facing, and communicates with the microcomputer system through a wired or wireless connection.

[0010] In one or more embodiments of the present invention, when there are a plurality of photoelectric detection modules, the photoelectric detection modules are spaced at equal intervals.

[0011] In one or more embodiments of the present invention, the distance between the photoelectric detection modules is equal to the distance from the lowermost cable fixing frame to the first photoelectric detection module.

[0012] In one or more embodiments of the present invention, the distance between the photoelectric detection modules is 5 meters.

[0013] In one or more embodiments of the present invention, the spacing between the light emitting tubes is 1-2 cm, and the spacing between the light receiving tubes is 1-2 cm.

[0014] In one or more embodiments of the present invention, the transmitting circuit connected to the light emitting tube includes a transistor Q1, a light emitting tube and a current limiting resistor R1 are connected in series between the collector of the transistor Q1 and the VCC terminal, the emitter of the transistor Q1 is grounded, and the base of the transistor Q1 is connected to and controlled by the microprocessor; the receiving circuit connected to the light receiving tube includes transistors Q2 and Q3, the transistor Q2 is a PNP transistor, the emitter of the transistor Q2 is connected to the VCC terminal, the collector of the transistor Q2 is grounded by the resistor R2, and the base of the transistor Q3 is connected to the light receiving tube; the collector of the transistor Q3 is connected to the VCC terminal and is connected to the microprocessor by the collector as an output terminal, the emitter of the transistor Q3 is grounded, and the base of the transistor Q3 is connected to the collector of the transistor Q2.

[0015] The method for detecting the swing amplitude of a traveling cable of the present invention is based on the above-mentioned system for detecting the swing amplitude of a traveling cable, and comprises:

[0016] 1) Steps for setting the swing threshold:

[0017] Obtaining the distance Dn of each photoelectric detection module relative to the lowest cable fixing frame, n=1, 2, ...;

[0018] Run the elevator car to the bottom floor, and shake the accompanying cable to make it swing with the maximum lateral swing amplitude Amax; at this time, any one or more photoelectric detection modules obtain the swing amplitude An of the accompanying cable facing it, n = 1, 2, ...; that is, when the accompanying cable reflects the light emitted by the light emitting tube to the light receiving tube through the cable body, the light receiving tube that receives the reflected light is considered valid, and then the spacing of the light receiving tubes is multiplied by the number of valid tubes to obtain the swing amplitude An;

[0019] Next, the corresponding maximum swing angle Bn is calculated based on the swing amplitude An and the distance Dn of the photoelectric detection module, where n=1, 2, ...; the calculation adopts the following formula:

[0020] Tangent function tan(Bn) = An / Dn; (1)

[0021] Inverse tangent function Bn = arctan(An / Dn); (2)

[0022] Finally, take the average value B of each maximum swing angle Bn mean as the swing threshold;

[0023] 2) Swing detection steps:

[0024] During the operation of the elevator, any one or more photoelectric detection modules are enabled to obtain the swing amplitude An of the accompanying cable facing it in real time. Similarly, when the accompanying cable reflects the light emitted by the light emitting tube to the light receiving tube through the cable body, the light receiving tube that receives the reflected light is considered valid. Then, the spacing of the light receiving tubes is multiplied by the number of valid tubes to obtain the swing amplitude An. The current swing amplitude angle Cn is calculated according to the above formulas (1) and (2).

[0025] Cn=arctan(An / Dn),n=1,2,...;

[0026] 3) Over-limit judgment and alarm steps:

[0027] The current swing angle Cn obtained is compared with the preset swing threshold B mean For comparison, when Cn is greater than or equal to B mean When the alarm occurs, report it.

[0028] In one or more embodiments of the present invention, the maximum lateral swing amplitude Amax is 20 cm.

[0029] In one or more embodiments of the present invention, the photoelectric detection module adopts a scanning detection mode, that is, only one photoelectric detection module is started at a time to perform scanning detection from top to bottom.

[0030] In one or more embodiments of the present invention, the distance Dn between each photoelectric detection module and the lowermost cable fixing frame is a multiple relationship.

[0031] The beneficial effects of the present invention are: using a photoelectric detection module (i.e., a photoelectric sensor) to directly detect the incoming line of the accompanying cable, the actual swing of the cable is fed back, and the swing of the accompanying cable can be accurately measured without the need for complex calculation logic. In addition, at least one photoelectric detection module is set according to demand, and the detection of the cable swing can be achieved at a relatively low cost. It has better economy, technicality and practicality, and is suitable for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the framework of the accompanying cable swing amplitude detection system.

[0033] Figure 2 This is a schematic diagram of the structure of the elevator shaft.

[0034] Figure 3 It is a structural diagram of the photoelectric detection module.

[0035] Figure 4 This is the schematic diagram of the transmitting circuit and receiving circuit of the photoelectric detection module. DETAILED DESCRIPTION

[0036] Combine the following Figures 1 to 4 , further describe this application scheme:

[0037] The accompanying cable swing amplitude detection system includes at least one photoelectric detection module 2 arranged longitudinally along the shaft below the lowest cable fixing frame 1; a microcomputer system 3 connected to each photoelectric detection module 2 to obtain the swing amplitude value of each detection point; the photoelectric detection module 2 includes a row of light emitting tubes 21 and a row of light receiving tubes 22 arranged at equal intervals, and a microprocessor 23, the microprocessor 23 obtains the effective number of light receiving tubes to calculate the swing amplitude value of the accompanying cable it is facing, and communicates with the microcomputer system 3 through a wired or wireless connection. The microcomputer system 3 uses a single-chip microcomputer, which is used to calculate and compare the data fed back by the photoelectric detection module 2, determine whether the swing amplitude of the accompanying cable 4 is normal, and report to the upper system such as the elevator system for alarm when the swing amplitude exceeds the limit.

[0038] When there are multiple photoelectric detection modules 2, the spacing between the photoelectric detection modules 2 is equal, and the spacing between the photoelectric detection modules 2 is equal to the spacing from the lowest cable fixing frame 1 to the first photoelectric detection module 2-1; that is, the distance between each photoelectric detection module 2 and the lowest cable fixing frame 1 is a multiple relationship. For example, the first photoelectric detection module 2-1 is set 5 meters below the cable fixing frame 1, and the second photoelectric detection module 2-2 is 5 meters away from the photoelectric detection module 2-1.

[0039] The spacing d of the light emitting tubes 21 is 1-2 cm, and the spacing d of the light receiving tubes 22 is 1-2 cm. The light emitting tubes 21 and the light receiving tubes 22 are paired one by one; for example, the spacing d of the light receiving tubes 22 is set to 1 cm. When the accompanying cable 4 reflects the light emitted by the light emitting tubes 21 to the light receiving tubes 22 through the cable body, and there are 5 light receiving tubes 22 that receive the reflected light, the spacing d = 1 cm of the light receiving tubes 22 is multiplied by the number of effective tubes = 5 to obtain a swing amplitude of 5 cm.

[0040] Specifically, the transmitting circuit connected to the light emitting tube 21 includes a transistor Q1, a light emitting tube and a current limiting resistor R1 are connected in series between the collector of the transistor Q1 and the VCC terminal, the emitter of the transistor Q1 is grounded, and the base of the transistor Q1 is connected to and controlled by the microprocessor 23; the receiving circuit connected to the light receiving tube 22 includes transistors Q2 and Q3, the transistor Q2 is a PNP transistor, the emitter of the transistor Q2 is connected to the VCC terminal, the collector of the transistor Q3 is grounded by the resistor R2, and the base of the transistor Q3 is connected to the light receiving tube; the collector of the transistor Q3 is connected to the VCC terminal and the collector of the transistor Q3 is connected to the microprocessor 23 as an output terminal, the emitter of the transistor Q1 is grounded, and the base of the transistor Q2 is connected to the collector of the transistor Q2. The transmitting signal can be modulated, and the distance can reach more than 20cm.

[0041] A method for detecting the swing amplitude of a traveling cable, comprising:

[0042] 1) Steps for setting the swing threshold:

[0043] Obtaining the distance Dn of each photoelectric detection module 2 relative to the lowest cable fixing frame 1, where n=1, 2, ...;

[0044] Run the elevator car 5 to the bottom floor, and shake the accompanying cable 4 to make it swing with the maximum lateral swing amplitude Amax; at this time, any one or more photoelectric detection modules 2 obtain the swing amplitude An of the accompanying cable 4 facing it, n=1, 2, ...; that is, when the accompanying cable 4 reflects the light emitted by the light emitting tube 21 to the light receiving tube 22 through the cable body, the light receiving tube 22 that receives the reflected light is considered valid, and then the spacing d of the light receiving tube 22 is multiplied by the number of effective tubes to obtain the swing amplitude An;

[0045] Next, the corresponding maximum swing angle Bn is calculated based on the swing amplitude An and the distance Dn of the photoelectric detection module, where n=1, 2, ...; the calculation adopts the following formula:

[0046] Tangent function tan(Bn) = An / Dn; (1)

[0047] Inverse tangent function Bn = arctan (An / Dn); (2)

[0048] Finally, take the average value B of each maximum swing angle Bn mean as the swing threshold;

[0049] In this embodiment, the maximum lateral swing amplitude Amax is 20 cm. Taking a 20-story building as an example, the maximum swingable length of the accompanying cable 4 is 20*3=60 meters, Bn=arctan(20 / 6000)=0.19, about 10 degrees;

[0050] 2) Swing detection steps:

[0051] During the operation of the elevator, the photoelectric detection module 2 is enabled in turn from top to bottom in a scanning manner to obtain the swing amplitude An of the accompanying cable 4 facing it in real time. Similarly, when the accompanying cable 4 reflects the light emitted by the light emitting tube 21 to the light receiving tube 22 through the cable body, the light receiving tube 22 that receives the reflected light is considered to be valid. Then, the spacing d of the light receiving tubes 22 is multiplied by the number of valid tubes to obtain the swing amplitude An. The current swing amplitude angle Cn is calculated according to the above formulas (1) and (2);

[0052] Cn=arctan(An / Dn),n=1,2,...;

[0053] 3) Over-limit judgment and alarm steps:

[0054] The current swing angle Cn obtained is compared with the preset swing threshold B mean For comparison, when Cn is greater than or equal to B mean When the alarm occurs, report it.

[0055] The above-mentioned preferred implementation modes should be regarded as illustrative examples of the implementation modes of the present application scheme. Any technical deductions, replacements, improvements, etc. that are identical or similar to the present application scheme or made based on this scheme should be regarded as within the scope of protection of this patent.

Claims

1. A traveling cable swing amplitude detection system, characterized in that: include At least one photoelectric detection module is arranged longitudinally along the shaft below the lowermost cable fixing frame; A microcomputer system connected to each photoelectric detection module to obtain the swing amplitude value of each detection point; The photoelectric detection module includes a row of light emitting tubes and a row of light receiving tubes arranged at equal intervals, and a microprocessor. The microprocessor obtains the effective number of light receiving tubes to calculate the swing value of the accompanying cable facing it, and communicates with the microcomputer system through a wired or wireless connection. The accompanying cable reflects the light emitted by the light emitting tube to the light receiving tube through the cable body, and the light receiving tube that receives the reflected light is regarded as the effective tube number; The swing amplitude value is the distance d between the light receiving tubes multiplied by the number of effective tubes.

2. The accompanying cable swing amplitude detection system according to claim 1 is characterized in that: When there are a plurality of photoelectric detection modules, the distances between the photoelectric detection modules are equal.

3. The accompanying cable swing amplitude detection system according to claim 2 is characterized in that: The spacing between the photoelectric detection modules is equal to the spacing from the lowermost cable fixing frame to the first photoelectric detection module.

4. The accompanying cable swing amplitude detection system according to claim 2 or 3, characterized in that: The distance between the photoelectric detection modules is 5 meters.

5. The accompanying cable swing amplitude detection system according to claim 1 is characterized in that: The spacing between the light emitting tubes is 1-2 cm, and the spacing between the light receiving tubes is 1-2 cm.

6. The accompanying cable swing amplitude detection system according to claim 1, 2 or 3, characterized in that: The transmitting circuit connected to the light emitting tube includes a transistor Q1, a light emitting tube and a current limiting resistor R1 are connected in series between the collector and the VCC terminal of the transistor Q1, the emitter of the transistor Q1 is grounded, and the base of the transistor Q1 is connected to and controlled by the microprocessor; The receiving circuit connected to the optical receiving tube includes transistors Q2 and Q3. The transistor Q2 is a PNP transistor, whose emitter is connected to the VCC terminal, whose collector is grounded by a resistor R2, and whose base is connected to the optical receiving tube; the collector of the transistor Q3 is connected to the VCC terminal and is connected to the microprocessor as an output terminal, whose emitter is grounded, and whose base is connected to the collector of the transistor Q2.

7. A method for detecting the swing amplitude of a traveling cable, based on the traveling cable swing amplitude detection system as claimed in claim 1, comprising: 1) Steps for setting the swing threshold: Obtain the distance Dn of each photoelectric detection module relative to the lowest cable fixing frame, n=1, 2, ...; Run the elevator car to the bottom floor, and shake the accompanying cable to make it swing with the maximum lateral swing amplitude Amax; at this time, any one or more photoelectric detection modules obtain the swing amplitude An of the accompanying cable facing it, n=1,2,...; that is, when the accompanying cable reflects the light emitted by the light emitting tube to the light receiving tube through the cable body, the light receiving tube that receives the reflected light is considered valid, and then the spacing of the light receiving tubes is multiplied by the number of valid tubes to obtain the swing amplitude An; Next, the corresponding maximum swing angle Bn is calculated based on the swing amplitude An and the distance Dn of the photoelectric detection module, where n=1, 2, ...; the calculation adopts the following formula: Tangent function: tan(Bn)=An / Dn; (1) Inverse tangent function: Bn=arctan(An / Dn); (2) Finally, the mean value Bmean of each maximum swing angle Bn is taken as the swing threshold; II) Swing detection steps: During the operation of the elevator, any one or more photoelectric detection modules are enabled to obtain the swing amplitude An of the accompanying cable facing it in real time. Similarly, when the accompanying cable reflects the light emitted by the light emitting tube to the light receiving tube through the cable body, the light receiving tube that receives the reflected light is considered valid. Then, the spacing of the light receiving tubes is multiplied by the number of valid tubes to obtain the swing amplitude An. The current swing amplitude angle Cn is calculated according to the above formulas (1) and (2); Cn=arctan(An / Dn),n=1,2,...; III) Over-limit judgment and alarm steps: The obtained current swing angle Cn is compared with the preset swing threshold Bmean. When Cn is greater than or equal to Bmean, an alarm is reported.

8. The method for detecting the swing amplitude of a traveling cable according to claim 7, characterized in that: The maximum lateral swing amplitude Amax is 20 cm.

9. The method for detecting the swing amplitude of a traveling cable according to claim 7, characterized in that: The photoelectric detection module adopts a scanning detection mode, that is, only one photoelectric detection module is started at a time, and scanning detection is performed from top to bottom.

10. The method for detecting the swing amplitude of a traveling cable according to claim 7, characterized in that: The distances Dn between each photoelectric detection module and the lowermost cable fixing frame are in multiples.

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