Speed monitoring and safety device of crane hoisting mechanism

Abstract

The utility model discloses a speed monitoring and safety device for a crane hoisting mechanism, and relates to the technical field of crane hoisting. The device comprises a three-position worm connector arranged on the outer side of a main hook steel wire rope reel, an encoder and a high-speed rotation limiting stopper are arranged at the two ends of the three-position worm connector respectively, and feedback signals of the encoder and the high-speed rotation limiting stopper are output to a traveling crane PLC control system. Compared with the prior art, the utility model can solve the problems that the travel switch cannot be reset after being impacted for many times, so that the lifting mechanism of the travelling crane is decelerated and stopped to fail, and safety accidents are caused.

Description

Technical Field

[0001] This utility model relates to the field of crane lifting technology, and in particular to a speed monitoring and safety device for crane lifting mechanisms. Background Technology

[0002] Normally, overhead cranes are equipped with limit switches, also known as lifting height limiters, which are a mandatory requirement for safe operation. The limit switches of the lifting mechanism are installed on the side of the main hook wire rope drum. When the crane lifting mechanism rises to a certain height, the limit switch will hit the trolley beam, and the crane lifting mechanism will begin to decelerate until it stops. However, after being hit multiple times, the limit switch may fail to reset, resulting in the failure of deceleration and stopping. This can lead to safety accidents such as the lifting mechanism continuing to rise and hitting the top, wire rope breakage, and hook falling. Utility Model Content

[0003] The purpose of this invention is to provide a speed monitoring and safety device for a crane lifting mechanism, which can solve the problem that the limit switch cannot be reset after being hit multiple times, causing the crane lifting mechanism to decelerate and stop, thus resulting in a safety accident.

[0004] To solve the above problems, the technical solution adopted by this utility model is as follows: This crane hoisting mechanism speed monitoring and safety device includes a three-position worm gear connector located on the outside of the main hook wire rope drum. The two ends of the three-position worm gear connector are respectively equipped with an encoder and a high-speed rotation limiter. The feedback signals of the encoder and the high-speed rotation limiter are output to the crane PLC control system.

[0005] A more specific technical solution than the above-mentioned technical solution may be: a cross coupling is provided between the three-position worm gear connector and the main hook wire rope drum, and the three-position worm gear connector and the main hook wire rope drum are respectively connected to the two ends of the cross coupling through a cross connecting rod.

[0006] Furthermore, the three-position worm gear connector is connected to the encoder via a first connecting rod.

[0007] Furthermore, the three-position worm gear connector is connected to the high-speed rotation limiter via a second connecting rod.

[0008] Furthermore, the three-position worm gear connector and the high-speed rotation limiter are mounted on the same mounting bracket.

[0009] Furthermore, the encoder is mounted on the mounting bracket via an encoder mounting bracket.

[0010] Furthermore, the encoder is an absolute encoder.

[0011] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art:

[0012] This invention utilizes an encoder and a high-speed rotary limit switch to achieve the functions of monitoring the operating height and interlocking safety of the crane hoisting mechanism, thereby improving the safety performance of the crane hoisting mechanism. The encoder is used to continuously monitor the height of the hoisting mechanism and provide accurate position data. The high-speed rotary limit switch monitors the rotation speed or number of turns of the main hook wire rope drum and triggers a deceleration or stop signal, forming redundant control with the encoder to prevent safety accidents caused by the failure of a single monitoring component. Even if the limit switch fails, it can prevent safety accidents such as the hoisting mechanism overshooting the top, wire rope breakage, and hook falling. Attached Figure Description

[0013] Figure 1 This is the front view of this utility model;

[0014] Figure 2 yes Figure 1 The left view;

[0015] Figure 3 yes Figure 1 Top view. Detailed Implementation

[0016] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model; however, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0017] like Figures 1 to 3 The speed monitoring and safety device of the crane hoisting mechanism shown includes a three-position worm gear connector 2 located on the outside of the main hook wire rope drum 1. The two ends of the three-position worm gear connector 2 are respectively equipped with an encoder 3 and a high-speed rotation limiter 4. The feedback signals of the encoder 3 and the high-speed rotation limiter 4 are output to the crane PLC control system.

[0018] A cross coupling 5 is provided between the three-position worm gear connector 2 and the main hook wire rope drum 1. The three-position worm gear connector 2 is connected to one end of the cross coupling 5 through the first cross connecting rod 6, and the main hook wire rope drum 1 is connected to the other end of the cross coupling 5 through the second cross connecting rod 7.

[0019] The three-position worm gear connector 2 is connected to the encoder 3 via the first connecting rod 8, and the three-position worm gear connector 2 is connected to the high-speed rotary limiter 4 via the second connecting rod 9.

[0020] The three-position worm gear connector 2 and the high-speed rotary limiter 4 are mounted on the same mounting bracket 10, and the encoder 3 is mounted on the mounting bracket 10 via the encoder fixing bracket 11.

[0021] In this embodiment, encoder 3 is an absolute encoder.

[0022] When this utility model is in use, when the hoisting mechanism of the crane reaches a certain height, the encoder 3 and the high-speed rotary limiter 4 send feedback signals to the crane PLC control system. The crane PLC control system controls the hoisting mechanism to immediately decelerate. After the hoisting mechanism decelerates to a certain height, the encoder 3 and the high-speed rotary limiter 4 send feedback signals to the crane PLC control system again. The crane PLC control system controls the hoisting mechanism to stop running. Only when the hoisting mechanism descends in the reverse direction can it maintain its original speed and operate normally.

[0023] This utility model uses encoder 3 and high-speed rotary limiter 4 to realize the function of monitoring the operating height of the crane hoisting mechanism and safety interlocking, thereby improving the safety performance of the crane hoisting mechanism. Encoder 3 is used to continuously monitor the height of the hoisting mechanism and provide accurate position data. High-speed rotary limiter 4 monitors the rotation speed or number of turns of the main hook wire rope drum 1 and triggers deceleration or stop signals, forming redundant control with encoder 3 to prevent safety accidents caused by the failure of a single monitoring component. Even if the limit switch fails, it can avoid safety accidents such as the hoisting mechanism rising to the top, wire rope breakage, and hook falling.

[0024] The three-position worm gear connector 2 serves as an intermediate transmission component, used to synchronously transmit the rotational motion of the main hook wire rope drum 1 to the encoder 3 and the high-speed rotation limiter 4, ensuring the real-time and consistency of signal acquisition and realizing multi-signal synchronous acquisition and safety interlocking.

[0025] The cross coupling 5 features strong torque transmission capability, high transmission accuracy, simple structure, and convenient maintenance. It is used to connect the main hook wire rope drum 1 with the three-position worm gear connector 2, and transmit rotational torque to the encoder 3 and the high-speed rotation limiter 4.

[0026] Absolute encoders have the characteristics of power-off memory, no need for repeated zeroing, high precision, high reliability and strong anti-interference ability, making them the preferred type of encoder required by this utility model.

Claims

1. A speed monitoring and safety device for a crane lifting mechanism, characterized in that: It includes a three-position worm gear connector located on the outside of the main hook wire rope drum. The two ends of the three-position worm gear connector are respectively equipped with an encoder and a high-speed rotation limiter. The feedback signals of the encoder and the high-speed rotation limiter are output to the crane PLC control system.

2. The speed monitoring and safety device for the crane lifting mechanism according to claim 1, characterized in that: A cross coupling is provided between the three-position worm gear connector and the main hook wire rope drum. The three-position worm gear connector and the main hook wire rope drum are respectively connected to the two ends of the cross coupling through a cross connecting rod.

3. The crane lifting mechanism speed monitoring and safety device according to claim 1 or 2, characterized in that: The three-position worm gear connector is connected to the encoder via a first connecting rod.

4. The speed monitoring and safety device for the crane lifting mechanism according to claim 3, characterized in that: The three-position worm gear connector is connected to the high-speed rotary limiter via a second connecting rod.

5. The speed monitoring and safety device for the crane lifting mechanism according to claim 4, characterized in that: The three-position worm gear connector and the high-speed rotary limiter are mounted on the same mounting bracket.

6. The speed monitoring and safety device for the crane lifting mechanism according to claim 5, characterized in that: The encoder is mounted on the mounting bracket via an encoder mounting bracket.

7. The speed monitoring and safety device for the crane lifting mechanism according to claim 6, characterized in that: The encoder is an absolute encoder.

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