Multifunctional crown block wire box limiting device

Abstract

The utility model relates to the technical field of aluminum smelting, in particular to a multifunctional crown block wire box limiting device which comprises a cab arranged below a crown block main beam, a winding and lifting mechanism arranged on the side wall of the crown block main beam, a wire box connected with the winding and lifting mechanism and a limiting mechanism arranged on the side wall of the crown block main beam. The limiting mechanism is used in cooperation with the wire box and used for controlling starting and stopping of the rolling and lifting mechanism. According to the utility model, through the mechanical limiting mechanism, the limiting action can be triggered through physical contact and the power supply of the motor can be directly cut off in case of network failure without depending on network signals, so that the downtime of failure is shortened and the continuity of electrolysis production is guaranteed. The limiting mechanism is in sliding connection with the lifting belt through the steel wire rope and the drop hammer, large-scale transformation of an original hoisting mechanism of the crown block is not needed, installation is convenient and fast, and debugging is easy. The device can be directly adapted to a lifting belt system of an existing multifunctional crown block, forms dual protection with original network control, and does not affect original operation logic.

Description

Technical Field

[0001] This utility model relates to the field of aluminum smelting technology, specifically a multifunctional overhead crane wire box limiting device. Background Technology

[0002] In industrial sectors such as aluminum smelting, multi-functional overhead cranes are key equipment in electrolytic production, with their cable box lifting systems used for cable harness management. Currently, the lifting control of existing multi-functional overhead cranes typically relies on the crane's network control system, transmitting limit signals via the network to control the start and stop of the hoisting motor. However, in actual operation, when the crane experiences a network failure, the cable box lifting control signal transmission is interrupted, causing the cable box to frequently overshoot due to the loss of limit protection, leading to serious malfunctions such as hoisting motor burnout, wire rope breakage, and contactor damage. Frequent downtime due to these failures severely impacts electrolytic production efficiency, increases equipment maintenance costs, and raises the risk of production interruptions. Although some mechanical limit devices exist in existing technologies, most are complex in structure, difficult to install and debug, and incompatible with the crane's existing lifting system, making it difficult to reliably trigger limit actions in network failure scenarios. Utility Model Content

[0003] The purpose of this invention is to provide a multifunctional overhead crane cable box limiting device to solve the problem mentioned in the background art, where interruption of the cable box lifting control signal transmission causes the cable box to frequently overshoot the top due to loss of limit protection.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a multifunctional overhead crane cable box limiting device, including a cab located below the main beam of the overhead crane, a hoisting mechanism located on the side wall of the main beam of the overhead crane, a cable box connected to the hoisting mechanism, and a limiting mechanism located on the side wall of the main beam of the overhead crane; the limiting mechanism is used in conjunction with the cable box to control the start and stop of the hoisting mechanism.

[0005] Furthermore, the hoisting mechanism includes a support plate on the side wall of the main beam of the crane, a motor on the support plate, and a drum connected to the output shaft of the motor; the drum is provided with a lifting belt, which is connected to the electrical box.

[0006] Furthermore, the limiting mechanism includes a limit switch mounted on a support plate and a drop hammer connected to the limit switch drive head via a wire rope; the limit switch is connected to a motor, and the drop hammer passes through the lifting belt and can slide on the lifting belt.

[0007] Furthermore, the limit switch is specifically a normally open limit switch.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0009] 1. This utility model uses a mechanical limit mechanism (falling hammer + limit switch) to directly cut off the motor power supply by physically triggering the limit action in the event of a network failure, without relying on network signals, thereby reducing downtime and ensuring the continuity of electrolysis production.

[0010] 2. The limiting mechanism of this utility model is slidably connected to the hoisting belt via a steel wire rope, a drop hammer, and the hoisting belt. It eliminates the need for large-scale modifications to the original hoisting mechanism of the overhead crane, making installation convenient and debugging simple. It can be directly adapted to the existing hoisting belt system of multi-functional overhead cranes, forming dual protection with the existing network control without affecting the original operating logic. Attached Figure Description

[0011] Figure 1 This is a structural diagram of the present utility model;

[0012] Figure 2 This is a rear view of the present invention.

[0013] In the picture:

[0014] 1. Overhead crane main beam; 2. Cab; 3. Electrical box; 4. Support plate; 5. Motor; 6. Drum; 7. Hoisting belt; 8. Limit switch; 9. Wire rope; 10. Drop hammer. Detailed Implementation

[0015] Please see Figures 1 to 2 A multifunctional overhead crane wiring box limiting device comprises a driver's cab 2 located below the main beam 1 of the overhead crane, a hoisting mechanism mounted on the side wall of the main beam, a wiring box 3 connected to the hoisting mechanism, and a limiting mechanism mounted on the side wall of the main beam. The hoisting mechanism is used to raise and lower the wiring box 3 to a suitable position for operator control; the limiting mechanism, in conjunction with the wiring box 3, mechanically cuts off power to the hoisting mechanism in the event of a network failure in the overhead crane system, preventing the wiring box 3 from overshooting the top.

[0016] Specifically,

[0017] The hoisting mechanism consists of a support plate 4, a motor 5, a drum 6, and a lifting belt 7. The support plate 4 is welded or bolted to the side wall of the main beam 1 of the overhead crane. The motor 5 is specifically a hoisting motor, mounted on the support plate 4 via a motor mount. The drum 6 is connected to the output shaft of the motor 5, and the motor 5 drives the drum 6 to rotate. One end of the lifting belt 7 is fixed to the drum 6, and the other end is connected to the electrical box 3. The motor 5 is also connected to the control system inside the cab 2, which transmits limit signals via a network to control the start and stop of the motor 5.

[0018] The limit mechanism consists of a limit switch 8 and a drop hammer 10. The limit switch 8 is a normally open limit switch, which is bolted to the support plate 4 and connected to the motor 5. The drop hammer 10 is connected to the drive head of the limit switch 8 via a wire rope 9, and the drop hammer 10 passes through the lifting belt 7 and can slide on the lifting belt 7.

[0019] Working principle of this utility model:

[0020] 1. Normal working status

[0021] In the limit mechanism, the drop hammer 10 is connected to the drive head of the limit switch 8 via the wire rope 9, and the drop hammer is mounted on the lifting belt 7.

[0022] Limit switch 8 is normally open. Under normal circumstances, the drop hammer pulls the wire rope downward due to its own weight, keeping the drive head of the limit switch in a stretched state. At this time, the limit switch is in the normally open state and does not affect the normal operation of the hoisting mechanism.

[0023] The motor 5 of the hoisting mechanism receives network signals through the control system of the cab 2, controls the drum 6 to rotate, drives the lifting belt 7 to rise and fall, thereby realizing the normal lifting and lowering of the wire box 3.

[0024] 2. In case of network failure

[0025] When the crane experiences a network failure, the control system cannot transmit limit signals via the network. Motor 5 continues to run, and the cable box 3, along with the hoisting belt 7, moves upwards beyond its limit. When the cable box 3 reaches its limit position, its top contacts and pushes the drop hammer 10 upwards. The drop hammer loses its tension on the wire rope, and the drive head of the limit switch 8 resets, changing the limit switch from a normally open to a normally closed state. After the limit switch closes, the power circuit of motor 5 is directly cut off, the drum 6 stops rotating, and the cable box 3 immediately stops rising, preventing an overshoot accident.

Claims

1. A multifunctional overhead crane wiring box limiting device, comprising a cab (2) located below the main beam (1) of the overhead crane, a hoisting mechanism located on the side wall of the main beam of the overhead crane, and a wiring box (3) connected to the hoisting mechanism, characterized in that, It also includes a limiting mechanism installed on the side wall of the main beam of the crane; the limiting mechanism is used in conjunction with the electrical box (3) to control the start and stop of the hoisting mechanism.

2. The limiting device as described in claim 1, characterized in that, The lifting mechanism includes a support plate (4) on the side wall of the main beam (1) of the crane, a motor (5) on the support plate (4), and a drum (6) connected to the output shaft of the motor (5); the drum (6) is provided with a lifting belt (7), which is connected to the electrical box (3).

3. The limiting device as described in claim 1, characterized in that, The limiting mechanism includes a limit switch (8) mounted on a support plate (4) and a drop hammer (10) connected to the drive head of the limit switch (8) via a wire rope (9); the limit switch (8) is connected to a motor (5), and the drop hammer (10) is mounted on a lifting belt (7) and can slide on the lifting belt (7).

4. The limiting device as described in claim 3, characterized in that, The limit switch (8) is specifically a normally open limit switch.

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