Tower crane lifting hook anti-top-rushing detection system based on photoelectric sensor

Abstract

The utility model discloses a photoelectric sensor-based tower crane lifting hook anti-collision detection system, which structurally comprises a tower crane main body, a lifting hook, a photoelectric sensor and a reflecting plate mounting bracket, the lower part of the tower crane main body is provided with a variable-amplitude trolley, and the lifting hook is fixedly connected with the variable-amplitude trolley; the photoelectric sensor is installed on the lower portion of the variable-amplitude trolley, the reflecting plate installation support is fixedly arranged on the side portion of the lifting hook, a signal reflecting plate is installed on the top of the lifting hook, and when the lifting hook moves upwards to the upper limiting position, the photoelectric sensor detects a reflecting signal and sends the signal to the signal collector through the wireless network bridge; the signal collector transmits signals to the PLC control system through communication, and the PLC control system sends signals for stopping ascending to the lifting hook, so that the lifting hook is prevented from rushing to the top. The utility model belongs to the field of tower cranes, and particularly relates to a tower crane lifting hook anti-top-rushing detection system based on a photoelectric sensor.

Description

Technical Field

[0001] This utility model belongs to the field of tower cranes, specifically referring to a tower crane hook anti-overshoot detection system based on photoelectric sensors. Background Technology

[0002] Tower cranes are an important type of construction machinery in the engineering field. When the crane hook overshoots the top, the wire rope breaks, causing the hook to fall freely and often resulting in significant property damage and personal injury. Currently, safety protection mainly relies on mechanical limit switches and electronic limit switches with lifting encoders. However, with prolonged use, mechanical and electronic limit switches often accumulate errors, and in actual use, they can be disabled by bypass buttons during jacking and adding sections, rendering their safety protection functions ineffective. Utility Model Content

[0003] The technical problem this invention aims to solve is the cumulative error in mechanical and electronic limit switches.

[0004] To solve the above problems, the technical solution adopted by this utility model is as follows: The tower crane hook anti-overrun detection system based on photoelectric sensor proposed by this utility model includes a tower crane body and a hook. A luffing trolley is installed on the lower part of the tower crane body. The hook and the luffing trolley are fixedly connected. It also includes a photoelectric sensor and a reflector mounting bracket. The photoelectric sensor is installed on the lower part of the luffing trolley. The reflector mounting bracket is fixed on the side of the hook. A signal reflector is installed on the top of the hook.

[0005] Furthermore, the photoelectric sensor is positioned directly above the signal reflector, and is arranged opposite to the signal reflector.

[0006] Furthermore, the photoelectric sensor incorporates a wireless network transmission chip and a battery.

[0007] Furthermore, a signal collector and a controller are installed inside the tower crane body. The signal collector is equipped with a wireless network transmission chip, and the signal collector and the controller are connected by electrical signals.

[0008] Furthermore, the photoelectric sensor and the model acquisition unit are connected wirelessly.

[0009] Furthermore, the controller is a PLC controller or a microprocessor.

[0010] The beneficial effects of this utility model by adopting the above structure are as follows:

[0011] The proposed tower crane hook anti-overshoot detection system based on photoelectric sensors uses a reflector mounting bracket with a signal reflector mounted on it. This system works in conjunction with a photoelectric sensor mounted on the lower part of the luffing trolley for control. It is a direct sensor measurement system with good repeatability, cannot be shielded, and is easy to install and use. It can be widely applied to tower cranes of various specifications and can also be used to upgrade older cranes that do not have this function. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the first partial structure of the present invention;

[0013] Figure 2 This is a schematic diagram of the second partial structure of the present invention;

[0014] Figure 3 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 4 This is a flowchart of the operating system of this utility model;

[0016] Figure 5 This is a diagram showing the operating system configuration of this utility model.

[0017] The components include: 1. photoelectric sensor, 2. luffing trolley, 3. reflector mounting bracket, 4. signal reflector, 5. hook, and 6. tower crane body.

[0018] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0020] like Figure 1-5As shown, this utility model proposes a tower crane hook anti-overrun detection system based on photoelectric sensors, including a tower crane body 6 and a hook 5. A luffing trolley 2 is installed at the lower part of the tower crane body 6, and the hook 5 and the luffing trolley 2 are fixedly connected. It also includes a photoelectric sensor 1 and a reflector mounting bracket 3. The photoelectric sensor 1 is installed at the lower part of the luffing trolley 2. The photoelectric sensor 1 can be an Omron E3Z series, which is suitable for the 0.5m safety distance requirement and is dustproof and waterproof, suitable for construction site environments. The reflector mounting bracket 3 is fixed to the side of the hook 5, and a signal reflector 4 is installed on the top of the hook 5. The signal reflector 4 can be a 3M diamond-shaped reflector with high reflectivity.

[0021] The photoelectric sensor 1 is located directly above the signal reflector 4, facing it. The photoelectric sensor 1 contains a wireless network transmission chip and a battery, which are used for signal transmission and system power supply, respectively. The tower crane body 6 is equipped with a signal collector and a controller. The signal collector also contains a wireless network transmission chip. The signal collector and the controller are connected by electrical signals. The wireless network transmission chip can be the Nordic nRF52840 model, which is suitable for industrial-grade wireless communication. It is recommended to use the Advantech ADAM-4000 series module for the signal collector. The photoelectric sensor 1 and the signal collector are connected by wireless signals.

[0022] The controller can be a PLC controller or a microprocessor. The PLC controller can be a Siemens S7-1200 model, and the microprocessor can be an STM32F407 model.

[0023] The specific working principle is as follows:

[0024] Step photoelectric sensor 1: When the system starts, confirm that photoelectric sensor 1 is not activated. At this time, the hoisting hook 5 can move up and down normally.

[0025] Step 2 of the luffing trolley: Photoelectric sensor 1 receives the light signal from signal reflector 4. When the hoisting hook 5 moves upward to the safe limit position approximately 0.5m from the top, photoelectric sensor 1 is triggered. Photoelectric sensor 1 transmits the action signal to a wireless bridge signal via a wireless network transmission chip. The signal acquisition unit receives the wireless bridge signal, processes it, and transmits the processed data to the controller via MODBUS485 or CAN communication. The controller then issues a signal to stop the upward movement of hook 5.

[0026] Step 3: When the hook 5 descends to a safe position, the photoelectric sensor 1 stops operating, and the lifting hook 5 can move up and down normally.

[0027] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A tower crane hook (5) anti-overrun detection system based on a photoelectric sensor (1), comprising a tower crane body (6) and a hook (5), wherein a luffing trolley (2) is installed at the lower part of the tower crane body (6), and the hook (5) and the luffing trolley (2) are fixedly connected, characterized in that: It also includes a photoelectric sensor (1) and a reflector mounting bracket (3). The photoelectric sensor (1) is installed on the lower part of the luffing trolley (2), and the reflector mounting bracket (3) is fixed on the side of the hook (5). A signal reflector (4) is installed on the top of the hook (5).

2. The tower crane hook (5) anti-collision detection system based on photoelectric sensor (1) according to claim 1, characterized in that: The photoelectric sensor (1) is located directly above the signal reflector (4) and is positioned opposite to the signal reflector (4).

3. The tower crane hook anti-overrun detection system based on photoelectric sensors according to claim 2, characterized in that: The photoelectric sensor (1) is equipped with a wireless network transmission chip and a battery.

4. The tower crane hook anti-overrun detection system based on photoelectric sensors according to claim 3, characterized in that: The tower crane body (6) is equipped with a signal collector and a controller. The signal collector is equipped with a wireless network transmission chip. The signal collector and the controller are connected by electrical signals.

5. The tower crane hook anti-overrun detection system based on photoelectric sensors according to claim 4, characterized in that: The photoelectric sensor (1) and the model acquisition unit are connected by a wireless signal.

6. The tower crane hook anti-overrun detection system based on photoelectric sensors according to claim 5, characterized in that: The controller is a PLC controller or a microprocessor.

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