Counterweight diversion sheave jamming detection device

Abstract

The invention discloses a counterweight diversion sheave jamming detection device which comprises a miniature power generation module, a signal transmitting module and a signal receiving module. The micro power generation module comprises a permanent magnet and an induction coil, the signal transmitting module comprises a conversion circuit and a transmitter, and the signal receiving module comprises a receiver and a signal processor; the permanent magnet is fixed to the end face of the diversion sheave, the induction coil is fixed to a diversion sheave frame, and the installation positions of the permanent magnet and the induction coil enable the induction coil to generate current when the permanent magnet passes through the position nearby the induction coil when the diversion sheave rotates. The induction coil is electrically connected with the conversion circuit, and when the induction coil generates current, the emitter sends electromagnetic signals to the outside; the signal receiving module is arranged on the side of a lift car or at a preset position in a shaft, the receiver is used for receiving electromagnetic signals sent by the emitter outwards, and the signal processor judges whether the counterweight diversion sheave is jammed or not according to the position of the lift car or the counterweight and the electromagnetic signals.

Description

Technical Field

[0001] This invention relates to the field of elevator technology, and specifically to a counterweight anti-cord sheave jamming detection device. Background Technology

[0002] To reduce the cost of traction machines, current traction drive elevator systems generally adopt a winding ratio of 2:1 or higher. To achieve this arrangement, it is inevitable to configure one or more movable pulleys, commonly known as anti-rope pulleys, on the car and counterweight.

[0003] Under normal circumstances, the counterweight sheave rotates freely under the friction of the traction wire rope. If the counterweight sheave becomes jammed due to bearing failure, the sheave shaft may rotate due to the jamming, eventually causing damage to the sheave shaft fixing components. This can lead to the counterweight sheave falling off the counterweight frame and causing a serious safety accident. To solve the above problems, this invention provides a counterweight counterweight sheave fault detection device and method.

[0004] The most direct way to detect jamming of the counterweight reverse rope pulley is to install an encoder or other sensor on the shaft of the counterweight reverse rope pulley. The encoder or sensor can be used to obtain the rotation speed of the rope pulley and thus determine whether the rotation of the reverse rope pulley is abnormal. However, the problem of power supply to the counterweight side must be solved first.

[0005] Another technology involves adding a detection mechanism to the counterweight sheave shaft or axle baffle. When the shaft or baffle rotates due to sheave jamming, it triggers a switch or sensor to provide an early warning of the fault. These technologies have two main problems: firstly, the difficulty of supplying power to the counterweight side must be addressed; secondly, the fault detection time is too late. By the time the switch activates due to axle baffle failure and the elevator stops in an emergency, the counterweight sheave is already in an unsafe state, and during the emergency stop, the sheave is highly likely to detach, causing a safety accident. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the present invention provides a counterweight anti-rope pulley jamming detection device, comprising a micro power generation module, a signal transmission module, and a signal receiving module; The micro power generation module includes a permanent magnet and an induction coil; the signal transmission module includes a conversion circuit and a transmitter; and the signal receiving module includes a receiver and a signal processor. The permanent magnet is fixed to the end face of the anti-reverse rope wheel, and the induction coil is fixed to the frame of the anti-reverse rope wheel. The installation positions of the permanent magnet and the induction coil are such that when the permanent magnet passes near the induction coil when the anti-reverse rope wheel rotates, the induction coil can generate current. The induction coil is electrically connected to the conversion circuit. When the induction coil generates current, the conversion circuit converts the induced current into electrical energy to power the transmitter and enables the transmitter to send electromagnetic signals to the outside. The signal receiving module is set at a preset position on the side of the car or in the hoistway. The receiver is used to receive the electromagnetic signals sent by the transmitter. The signal processor determines whether the counterweight anti-rope pulley is stuck based on the position of the car or counterweight and the electromagnetic signals.

[0007] Preferably, it further includes a charging energy storage module, which includes a charging circuit and a battery; the induction coil is electrically connected to the charging circuit; the charging energy storage module supplies power to the signal transmission module or to other detection components installed on the counterweight side.

[0008] Preferably, there are at least two permanent magnets and at least two induction coils.

[0009] Preferably, the induction coils are connected in series or in parallel.

[0010] Preferably, the signal receiving module is fixed on the car; when the elevator is running, the signal processor receives the car position information in real time. When the car position is within the preset range, if the receiver does not receive an electromagnetic signal, it is determined that the counterweight sheave is jammed.

[0011] Preferably, the signal receiving module is fixed at a preset position in the shaft; when the elevator is running, the signal processor receives the counterweight position information in real time. When the counterweight position is within the preset range, if the receiver does not receive an electromagnetic signal, it is determined that the counterweight anti-roll rope pulley is stuck.

[0012] Preferably, the signal receiving module is integrated into the mobile device; maintenance personnel hold the mobile device at any floor or inside the elevator car and operate the elevator. When the counterweight passes through a preset interval, the signal receiving module receives the electromagnetic signal and determines whether the counterweight sheave is jammed based on the electromagnetic signal.

[0013] Preferably, if the receiver receives an electromagnetic signal, it determines the problem based on the time interval of the electromagnetic signal; when the time interval is equal to a preset value, it is determined that the counterweight reverse rope wheel is not obstructed; when the time interval is less than the preset value, it is determined that the counterweight reverse rope wheel is obstructed.

[0014] This invention generates electrical energy by utilizing the rotational motion of the counterweight sheave, effectively solving the problem of power supply difficulties on the counterweight side. Attached Figure Description

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Figure 1 This is a schematic diagram of the counterweight anti-rope pulley jamming detection device in Example 1; Figure 2 This is a detailed schematic diagram of the fixed positions of the permanent magnet and induction coil in Example 1; Figure 3This is a schematic diagram showing the location and preset range of the signal receiving module in Example 1; Figure 4 The above is a waveform diagram of the electromagnetic signal in Example 1. Detailed Implementation

[0016] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can fully understand other advantages and technical effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through different specific embodiments, and the details in this specification can also be applied based on different viewpoints, with various modifications or changes made without departing from the overall design concept of the invention. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other. The following exemplary embodiments of the present invention can be implemented in many different forms and should not be construed as being limited to the specific embodiments set forth herein. It should be understood that these embodiments are provided to make the disclosure of the present invention thorough and complete, and to fully convey the technical solutions of these exemplary embodiments to those skilled in the art. Example 1

[0017] like Figures 1 to 3 As shown, this embodiment provides a counterweight reverse rope pulley jamming detection device, including a micro power generation module, a signal transmission module, and a signal receiving module.

[0018] The micro power generation module includes a permanent magnet 2 and an induction coil 4; the signal transmission module includes a conversion circuit and a transmitter 3; and the signal receiving module includes a receiver and a signal processor. The permanent magnet 2 is fixed on the end face of the anti-rope wheel 1, and the induction coil 4 is fixed on the anti-rope wheel frame 5. The installation positions of the permanent magnet 2 and the induction coil 4 are such that when the permanent magnet 2 passes near the induction coil 4 when the anti-rope wheel 1 rotates, the induction coil 4 can generate current. The induction coil 4 is electrically connected to the conversion circuit. When the induction coil 4 generates current, the conversion circuit converts the induced current into electrical energy that powers the transmitter 3, and enables the transmitter 3 to send electromagnetic signals to the outside. The signal receiving module is set at a preset position on the side of the car or in the hoistway. The receiver is used to receive the electromagnetic signals sent by the transmitter 3. The signal processor determines whether the counterweight anti-rope pulley is stuck based on the position of the car or counterweight and the electromagnetic signals.

[0019] Preferably, the counterweight reverse rope pulley jamming detection device further includes a charging energy storage module, which includes a charging circuit and a battery; the induction coil is electrically connected to the charging circuit; the charging energy storage module supplies power to the signal transmission module or to other detection components installed on the counterweight side.

[0020] In this embodiment, the permanent magnet and induction coil are at least one set, and the number of permanent magnets or induction coils can be increased as needed. When the rope wheel rotates once, induced current can be generated multiple times in the induction coil, thereby increasing the signal transmission frequency. When multiple permanent magnets and induction coils are set simultaneously, if the induction coils are connected in series and at least two permanent magnets are simultaneously close to different induction coils, the intensity of the induced current can be increased; if the induction coils are connected in parallel, redundancy can be increased, avoiding detection failure due to coil malfunction.

[0021] like Figure 3 As shown, the signal receiving module in this embodiment can be fixed at a position near the counterweight on the elevator car, or at a preset position near the counterweight on the elevator shaft wall. The position of the receiving module will affect the fault detection effect. Under normal circumstances, when the elevator moves to the point where the receiver and transmitter are at the same horizontal position, the receiver can receive the strongest signal from the transmitter. Assuming that the position of the car in the shaft is the reference position H0, when the car moves into the range of (H0-Δh) to (H0+Δh) (Δh is the effective reception range of the radio frequency signal), the receiver receives the radio frequency signal and determines the rotation state of the counterweight sheave based on the signal. Different arrangement methods are as follows: Figure 3 As shown. The car position can be obtained in real time through the elevator system, and the counterweight position can be calculated from the car position.

[0022] When the signal receiving module is fixed on the elevator car, the reference position H0 needs to be set in advance and entered into the signal processor; when the car passes through the preset section, the signal detection is triggered.

[0023] When the signal receiving module is fixed to the hoistway side, a designated floor can be used to replace the reference position H0. By adjusting the installation height of the receiver, signal detection can be triggered when the elevator passes through the designated floor (i.e., the preset interval). To increase the frequency of signal detection, the floor with the highest probability of being passed by the elevator can be prioritized, such as the main floor.

[0024] When the signal receiving module is integrated into the mobile device, maintenance personnel can hold the mobile device, select any floor, or stand inside the car to control the elevator operation. When the counterweight passes through the preset interval, the mobile device can receive electromagnetic signals from the counterweight, thereby determining whether there is any obstruction in the counterweight sheave.

[0025] like Figure 4As shown, the detected electromagnetic signal in this example is a group of rectangular wave signals. When the permanent magnet passes through the electromagnetic coil, a rectangular wave signal will be generated. Assuming the rotational speed of the compensating sheave is n, the time for the compensating sheave to rotate one circle is T = 1 / n. According to the time interval t0 between the rectangular wave signals, the rotational state of the rope sheave can be determined. If only one set of permanent magnet and electromagnetic coil is configured, if no signal is received, it means the rope sheave may be jammed and stop rotating; if a signal is received and t0 = T, it means the rotational speed of the compensating sheave is normal; if a signal is received and t0 > T, it means the compensating sheave can rotate, but may rotate smoothly due to jamming; if a signal is received and t0 < T, it means the elevator may run overspeed. The signal processing module can further calculate the rotational speed of the compensating sheave of the counterweight according to the signal on-off frequency, so as to achieve a more accurate fault warning.

[0026] The above has described the present invention in detail through specific implementation manners and embodiments, but these do not constitute limitations on the present invention. Without departing from the principle of the present invention, those skilled in the art can also make many deformations and improvements, which should also be regarded as the protection scope of the present invention.

Claims

1. A device for detecting a blocking of a counterweight rope around a sheave, characterized in that The micro power generation module, the signal transmitting module and the signal receiving module are included. The micro power generation module includes a permanent magnet and an induction coil, the signal transmitting module includes a conversion circuit and a transmitter, and the signal receiving module includes a receiver and a signal processor. The permanent magnet is fixed on the end face of the counterweight sheave, and the induction coil is fixed on the frame of the counterweight sheave. The induction coil is electrically connected with the conversion circuit. When the induction coil generates current, the conversion circuit converts the induced current into power for the transmitter, and makes the transmitter send electromagnetic signals.

2. The hoisting rope wheel blocking detection device according to claim 1, characterized in that The signal receiving module is arranged at a preset position on the car side or in the hoistway.

3. The hoisting rope wheel blocking detection device according to claim 1, characterized in that The receiver is used for receiving the electromagnetic signals sent by the transmitter, and the signal processor is used for judging whether the counterweight sheave is blocked according to the position of the car or the counterweight and the electromagnetic signals.

4. The hoisting rope wheel blocking detection device according to claim 2, characterized in that The charging energy storage module includes a charging circuit and a battery.

5. The hoisting rope wheel blocking detection device according to claim 1, characterized in that, The induction coil is electrically connected with the charging circuit.

6. The hoisting rope wheel jam detection device according to claim 1, characterized in that The charging energy storage module is used for supplying power for the signal transmitting module or other detection components arranged on the counterweight side.

7. The hoisting rope wheel blocking detection device according to claim 1, characterized in that The permanent magnet is at least two, and the induction coil is at least two.

8. The counterweight rope wheel blocking detection device according to claim 5, 6 or 7, characterized in that The induction coils are connected in series or in parallel. The signal receiving module is fixed on the car. When the elevator is running, the signal processor receives the car position information in real time. When the car position is in a preset interval, if the receiver does not receive the electromagnetic signals, it is judged that the counterweight sheave is blocked. The signal receiving module is fixed at a preset position in the hoistway. When the elevator is running, the signal processor receives the counterweight position information in real time. When the counterweight position is in a preset interval, if the receiver does not receive the electromagnetic signals, it is judged that the counterweight sheave is blocked. The signal receiving module is integrated in a mobile device. The maintenance personnel hold the mobile device at any landing side or in the car and operate the elevator to run. When the counterweight runs through the preset interval, the signal receiving module receives the electromagnetic signals and judges whether the counterweight sheave is blocked according to the electromagnetic signals. If the receiver receives the electromagnetic signals, it is judged according to the time interval of the electromagnetic signals. When the time interval is equal to a preset value, it is judged that the counterweight sheave is not blocked. When the time interval is less than the preset value, it is judged that the counterweight sheave is blocked.

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