Safety chain protection system for climbing-free device of wind turbine

Abstract

A safety chain protection system for a climbing-free device of a wind turbine comprises a climbing-free device safety detection unit and a lifting control circuit unit. The climbing-free device safety detection unit is provided with three safety detection loops including an anti-falling sliding block detection loop, a traction rope detection loop and a load detection loop. An output module of the climbing-free device safety detection unit adopts relay output, and a relay switch is connected to an external input circuit of a main control unit in the lifting control circuit unit and serves as an input signal of the main control unit; a sliding block installation detection device, a steel wire rope abrasion detection device and a pressure detection device safety chain control protection loop are designed, double sliding block detection is conducted, static and dynamic detection is conducted on the steel wire rope, and the overall safety performance of the climbing-free device is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of wind power towers, and in particular relates to a wind turbine anti-climbing device safety chain protection system. Background Art

[0002] The wind turbine non-climbing device is an electric lifting device installed on the basis of a ladder. The drive unit installed at the bottom of the vertical ladder drives the vehicle body to perform lifting and lowering actions by driving a steel wire traction rope connected to the upper part of the vehicle body through the top wheel assembly. The inverter and intelligent controller in the electric control box are used to control the motor drive speed to ensure the smooth operation of the vehicle body. It is equipped with two separate anti-fall systems: a vehicle body anti-fall system and a personal protection system to double the safety of high-altitude workers. The personal protection system is mainly installed on the ladder rail through a slider (anti-fall device) for protection. The existing non-climbing device does not have a detection and protection mechanism for the wear of the slider and wire rope and the weight of the lifted object. When the staff does not install the slider to climb the tower, the non-climbing device has no slider detection device, but it can still operate normally, and the personal anti-fall system fails, causing great safety hazards to the personnel's work and touching the red line of safety production violations. When the wire rope is worn and broken, it is difficult to find the problem point in time due to the long length of the rope body and the limited vision of the personnel. According to the safety regulations of Huaneng Group, the total weight of individuals and objects climbing must not exceed 100KG. The free climber has no weight warning device, posing a safety hazard. Summary of the invention

[0003] The invention aims to improve the safety protection measures of the existing wind turbine anti-climbing device.

[0004] A wind turbine anti-climbing device safety chain protection system, comprising an anti-climbing device safety detection unit and a lifting control circuit unit; characterized in that:

[0005] The safety detection unit of the free climber has three safety detection circuits, including the anti-fall slider detection circuit, the traction rope detection circuit, and the load detection circuit;

[0006] An electromagnetic sensor is used in the anti-fall slider detection circuit. The electromagnetic sensor is installed at the bottom rail of the ladder to detect whether the anti-fall slider is installed to the specified position;

[0007] A pressure sensor is used in the load detection circuit and installed at the bottom of the non-climbing platform;

[0008] In the traction rope detection circuit, a guide wheel is installed at the bottom of the ladder, the surface of the traction wire rope is close to the guide wheel, the guide wheel is mechanically connected with a magnetic body, and a Hall sensor is arranged corresponding to the magnetic body;

[0009] The output module of the safety detection unit of the free climber adopts relay output, and the relay switch is connected to the external input circuit of the main control unit in the lifting control circuit unit as the input signal of the main control unit.

[0010] The beneficial effects of the present invention are:

[0011] Compared with the existing technology, the safety chain control protection circuit of the slider installation detection, wire rope wear detection and pressure detection device is designed to carry out double slider detection and static and dynamic detection of the wire rope to improve the overall safety performance of the free climber. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the safety detection unit.

[0013] Figure 2 This is the wiring diagram of the lifting control circuit.

[0014] In the figure, there are an anti-fall slider detection circuit 11, a traction rope detection circuit 12, a load detection circuit 13, an A / D conversion module 2, a data acquisition module 3, a single-chip computer 4, relays K1 K2 K3 K4, a start button S1, and an emergency stop button S2. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] A wind turbine anti-climbing device safety chain protection system of the present application includes an anti-climbing device safety detection unit and a lifting control circuit unit. The anti-climbing device safety detection unit includes a data acquisition module 3, an A / D conversion module 2, a single-chip microcomputer 4 and an output module, and also includes an electromagnetic sensor, a Hall sensor, and a pressure sensor. The electromagnetic sensor, the Hall sensor, and the pressure sensor are all connected to the A / D conversion module. The A / D conversion module is connected to the single-chip microcomputer through the data acquisition module 3. The single-chip microcomputer is connected to the output module. The lifting control circuit unit includes a main control unit, a frequency converter, and a control motor. The control motor, the frequency converter, and the main control unit are connected in sequence.

[0017] The output module of the safety detection unit adopts relay output, and the relay switch is connected to the external input circuit of the main control unit in the lifting control circuit unit as the input signal of the main control unit.

[0018] The electric control box is used to place the safety detection unit of the climbing device, the lifting control circuit unit, and various buttons and indicator lights, where the buttons and indicator lights are set on the door panel of the electric control box. The buttons include: start button S1, emergency stop button S2, rising button, stop button, and descending button for controlling the operation of the climbing device; the indicator lights include: power indicator light, alarm light, and climbing device operation status light.

[0019] The safety detection unit of the free climber has three safety detection circuits, including an anti-falling slider detection circuit 11, a traction rope detection circuit 12, and a load detection circuit 13.

[0020] An electromagnetic sensor is used in the anti-fall slider detection circuit. The electromagnetic sensor is installed at the bottom guide rail of the ladder. It can detect whether the anti-fall slider is installed to the specified position to avoid using the free climber without the anti-fall slider or using a single anti-fall slider.

[0021] There are two electromagnetic sensors, which respectively correspond to detecting the two anti-fall sliding blocks.

[0022] After the anti-fall slider is installed in place, the electromagnetic sensor can sense the change of magnetic field, which is collected by the data acquisition module and output to the single-chip microcomputer, which performs safety logic judgment and control. When the two anti-fall sliders in the anti-fall slider detection circuit are installed in place, the anti-fall slider normal signal is generated, the output control relay K1 is energized, and the relay K1 switch is closed.

[0023] A pressure sensor is used in the load detection circuit and is installed at the bottom of the free-climbing device platform.

[0024] When the operator or the transported items are on the platform of the climb-free device, the pressure sensor can sense the pressure changes, which are collected by the data acquisition module and output to the microcontroller. The microcontroller performs safety logic judgment and control. When the sensed pressure value is less than the set value, a normal load signal is generated, the output control relay K2 is energized, and the relay K2 switch is closed.

[0025] like Figure 2 As shown in the figure, the relay K1 switch and the relay K2 switch are connected in series in the start button S1 input circuit of the lifting control circuit unit. When the relay K1 switch and the relay K2 switch are both in the closed state, the start button input circuit can be energized to trigger the start enable, and the climber can continue to move up / down through the up / down operation mode switch. The relay K1 switch and the relay K2 switch are normally open switches. When the anti-fall slider is installed abnormally or the load exceeds the limit, the relay K1 switch and the relay K2 switch are in the normally open state.

[0026] When either the relay K1 switch or the relay K2 switch is in the disconnected state, the input circuit of the start button S1 cannot be energized to trigger the start enable, so that the anti-climbing device cannot be started when the anti-fall slider is abnormal or the load exceeds the limit.

[0027] It also has a traction rope detection circuit.

[0028] A guide wheel is installed at the bottom of the ladder, and the two guide wheels are arranged in a clamping manner. The traction wire rope is located between the two guide wheels, and the surface of the traction wire rope is close to the guide wheels.

[0029] The guide wheel is installed at one end of the follower rod. The guide wheel is installed at one end of the follower rod, and the magnetic body is installed at the other end. A rotating shaft is set in the middle of the follower rod, and the length ratio of the follower rod on both sides of the rotating shaft is about 1:5. The guide wheel is installed on the shorter side, that is, the rotating shaft is located on the side close to the guide wheel. When the guide wheel rolls along the surface of the traction wire rope, it can move up and down with the surface of the wire rope, and the magnetic body at the other end also moves and has an enlarged moving distance. Through the mechanical amplification of the follower rod, the tiny fluctuations on the surface of the wire rope are amplified for easy sensing.

[0030] A Hall sensor is arranged corresponding to the magnetic body. When the magnetic body is displaced, the magnetic field changes. The Hall sensor can sense the magnetic field change, which is collected by the data acquisition module and output to the microcontroller, which performs safety logic judgment and control.

[0031] Under normal conditions, the wire rope has a lower limit diameter for wear and needs to have a good surface appearance. When the appearance shows cage-like distortion, rope core extrusion, kinking, partial flattening, bending, or broken strands, it needs to be replaced in time.

[0032] Through the clamping setting of two guide wheels, the Hall sensor is used to sense the displacement of the magnetic body. First, the diameter of the wire rope can be statically measured. When the measured value of the wire rope diameter is greater than the set value, a normal wire rope signal is generated, the output control relay K3 is energized, and the relay K3 switch is closed. The relay K3 switch is connected in series to the start button input circuit of the lifting control circuit unit. When the relay K3 switch is in the closed state, the start button S1 input circuit can be energized to trigger the start enable, and the climber can be realized by the up / down operation mode switch.

[0033] When the relay K3 switch is in the off state, the start button input circuit cannot be energized to trigger the start enable, so that when the wire rope wear exceeds the lower limit, the anti-climb device cannot be started.

[0034] In addition, during the operation of the anti-climbing device, the two guide wheels can also be used to dynamically detect the surface state of the wire rope in real time. When the anti-climbing device goes up / down, the two guide wheels move along the surface of the wire rope. When the wire rope has cage-shaped distortion, rope core extrusion, kinking, partial flattening, bending, or broken strands, it will cause the guide wheel to vibrate greatly. At the same time, the magnetic body will produce a sudden displacement, which will cause the magnetic field to change. The Hall sensor senses and outputs it to the single-chip microcomputer. The single-chip microcomputer generates a wire rope abnormality signal based on the received sudden signal, and the output control relay K4 is energized, and the relay K4 switch is closed. The relay K4 switch is connected in parallel to the emergency stop button S2 input circuit of the lifting control circuit unit. When the relay K4 switch is in the closed state, the emergency stop button input circuit is energized to trigger the emergency stop, and the anti-climbing device enters the emergency stop protection state.

[0035] Finally, it should be noted that the above description is only an explanation of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail, those skilled in the art can still modify the technical solutions described above or replace some of the technical features with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A wind turbine anti-climbing device safety chain protection system, comprising an anti-climbing device safety detection unit and a lifting control circuit unit; characterized in that: The safety detection unit of the free climber has three safety detection circuits, including the anti-fall slider detection circuit, the traction rope detection circuit, and the load detection circuit; An electromagnetic sensor is used in the anti-fall slider detection circuit. The electromagnetic sensor is installed at the bottom rail of the ladder to detect whether the anti-fall slider is installed to the specified position; A pressure sensor is used in the load detection circuit and installed at the bottom of the non-climbing platform; In the traction rope detection circuit, a guide wheel is installed at the bottom of the ladder, the surface of the traction wire rope is close to the guide wheel, the guide wheel is mechanically connected with a magnetic body, and a Hall sensor is arranged corresponding to the magnetic body; The output module of the safety detection unit of the free climber adopts relay output, and the relay switch is connected to the external input circuit of the main control unit in the lifting control circuit unit as the input signal of the main control unit.

2. A wind turbine anti-climbing device safety chain protection system according to claim 1, characterized in that: The anti-climbing device safety detection unit includes a data acquisition module, an A / D conversion module, a single-chip microcomputer and an output module. The electromagnetic sensor, the Hall sensor and the pressure sensor are all connected to the A / D conversion module. The A / D conversion module is connected to the single-chip microcomputer through the data acquisition module, and the single-chip microcomputer is connected to the output module.

3. A wind turbine anti-climbing device safety chain protection system according to claim 2, characterized in that: There are two electromagnetic sensors, which respectively correspond to detecting two anti-falling sliders; When the two anti-fall sliders in the anti-fall slider detection circuit are installed in place, the single-chip microcomputer generates a normal signal of the anti-fall slider, the output control relay K1 is energized, and the relay K1 switch is closed.

4. A wind turbine anti-climbing device safety chain protection system according to claim 2, characterized in that: When the sensed pressure value is less than the set value, the microcontroller generates a normal load signal, the output control relay K2 is energized, and the relay K2 switch is closed.

5. A wind turbine anti-climbing device safety chain protection system according to claim 1, characterized in that: The guide wheel is mechanically connected to the magnetic body by a follower rod; the guide wheel is installed at one end of the follower rod, and the magnetic body is installed at the other end; a rotating shaft is arranged in the middle of the follower rod, and the length ratio of the follower rod on both sides of the rotating shaft is about 1:N; the guide wheel is installed on the shorter side, that is, the rotating shaft is located on the side close to the guide wheel.

6. A wind turbine anti-climbing device safety chain protection system according to claim 5, characterized in that: N＝5-10。 7. A wind turbine anti-climbing device safety chain protection system according to claim 2, characterized in that: It has two guide wheels clamped together, and the traction wire rope is located between the two guide wheels; Through the clamping setting of two guide wheels, the displacement of the magnetic body is sensed by the Hall sensor, and the diameter of the wire rope is statically measured. When the measured value of the wire rope diameter is greater than the set value, the microcontroller generates a normal wire rope signal, the output control relay K3 is energized, and the relay K3 switch is closed.

8. A wind turbine anti-climbing device safety chain protection system according to claim 7, characterized in that: During the upward / downward operation of the non-climbing device, two guide wheels are used to dynamically detect the surface state of the wire rope in real time; When the wire rope has cage-like deformation, rope core extrusion, kinking, partial flattening, bending, or broken strands, the Hall sensor senses it and outputs it to the microcontroller. The microcontroller generates a wire rope abnormality signal based on the received mutation signal, and the output control relay K4 is energized, and the relay K4 switch is closed.

9. A wind turbine anti-climbing device safety chain protection system according to any one of claims 3, 4 and 7, characterized in that: Relays K1, K2, and K3 switches are connected in series in the input circuit of the start button S1 of the lifting control circuit unit.

10. A wind turbine anti-climbing device safety chain protection system according to claim 8, characterized in that: The relay K4 switch is connected in parallel to the emergency stop button input circuit of the lifting control circuit unit.

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