A method for facilitating the maintenance of the hoisting mechanism of a metallurgical overhead crane

Abstract

The present application provides a method for conveniently overhauling the hoisting mechanism of a metallurgical overhead crane. By using a lifting hook and a lifting tool to lift another hook off the ground, the metallurgical overhead crane under overhaul can move forward and backward normally. When other metallurgical overhead cranes come head-on, the metallurgical overhead crane under repair can move forward and backward to avoid other oncoming metallurgical overhead cranes, thus not affecting the normal lifting operations of other metallurgical overhead cranes, ensuring production, maximizing output, laying a solid foundation for high-efficiency and high-output converter continuous casting, eliminating the time waste and potential hazards of tipping and bumping caused by the hook landing, saving time and ensuring operation safety, ensuring the passage of ground metallurgical transport vehicles, eliminating ground pollution, eliminating the need for personnel to waste time cleaning the sludge contaminated by the wire rope on the ground, reducing the labor intensity of employees, and improving the on-site hygiene conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of metallurgical overhead cranes, and in particular to a method for conveniently overhauling the hoisting mechanism of a metallurgical overhead crane. Background Art

[0002] A bridge-type metallurgical overhead crane generally consists of a bridge (also known as a trolley), Large vehicle traveling mechanism , Small vehicle traveling mechanism , a hoisting mechanism, an operating cab and other parts. Among them, the hoisting mechanism is composed of a hoisting motor, a reducer, a drum, a brake, etc.; the hoisting motor is connected to the reducer through a coupling and a brake wheel, the output shaft of the reducer is connected to the drum around which the steel wire rope is wound, and the other end of the steel wire rope is equipped with a hook. When the drum rotates, the hook rises or falls as the steel wire rope winds or unwinds on the drum; for metallurgical overhead cranes with a lifting capacity of 15t and above, two sets of hoisting mechanisms are provided, namely a main hook and a sub-hook. Therefore, the heavy object obtains vertical movement on the hook as the drum rotates; it obtains left and right movement as the trolley moves in the width direction of the workshop, and can move back and forth as the trolley moves in the length direction of the workshop. In this way, the heavy object can move in the vertical, horizontal and longitudinal directions, and the heavy object can be moved to any position in the workshop to complete the hoisting and transportation task.

[0003] At present, during the daily maintenance and overhaul of the hoisting mechanism, the metallurgical overhead crane must be stopped to meet the overhaul conditions, which affects normal production. For a metallurgical overhead crane, increasing the operation time of the metallurgical overhead crane means increasing the output and enhancing production efficiency. Shortening the overhaul time and keeping the metallurgical overhead crane running means that the metallurgical overhead crane can operate normally, meet the production requirements and increase the output.

[0004] At present, the domestic steel industry has production capacity restrictions, and cost reduction has become the competitive trend of steel enterprises, which is imperative. Reducing equipment failures and minimizing the production time affected by maintenance have become a major problem to be overcome at present. Optimizing and changing the maintenance method of the hoisting mechanism to achieve that production is not restricted by maintenance and self-maintenance, maximizing production, and achieving the purpose of cost reduction and efficiency improvement not only increases the operation rate of the metallurgical overhead crane, but also increases the output. Therefore, optimizing the maintenance method of the metallurgical overhead crane is of great significance. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for conveniently overhauling the hoisting mechanism of a metallurgical overhead crane. To further ensure production, increase the operation rate of the metallurgical overhead crane, and reduce the shutdown problems caused by the overhaul and daily maintenance of the metallurgical overhead crane, it can effectively improve production efficiency, reduce production operation costs and consumption, achieve maximum benefits, and can completely replace the hoisting mechanism without stopping the metallurgical overhead crane, and safety can also be well guaranteed.

[0006] To solve the above technical problems, the technical solution proposed by the present invention is as follows:

[0007] A method for conveniently overhauling the hoisting mechanism of a metallurgical overhead crane, comprising the following steps carried out in sequence:

[0008] 1) The metallurgical overhead crane includes a first hoisting mechanism and a second hoisting mechanism. The first hoisting mechanism includes a first hook group, and the second hoisting mechanism includes a second hook group;

[0009] Lower the first hook group of the first hoisting mechanism to be overhauled until the hook head of the first hook in the first hook group is 20 cm - 30 cm from the ground;

[0010] 2) Lower the second hook group until the hook head of the second hook in the second hook group is 150 cm - 160 cm from the ground, and then ground personnel use a hoisting tool to connect the first hook and the second hook together;

[0011] 3) Lift the second hook group until it is 2 - 3 meters from the upper limit limit. The rising second hook group lifts the first hook group together, and control the hook head of the first hook to be 300 cm - 600 cm from the ground to prevent collision and scratching;

[0012] 4) The maintenance personnel cut off the power supply of the control cabinet of the first hoisting mechanism of the metallurgical overhead crane to stop the first hoisting mechanism;

[0013] And control other mechanisms including the second hoisting mechanism to keep running without power cut;

[0014] 5) The maintenance personnel overhaul the first hoisting mechanism;

[0015] When it is necessary to move the metallurgical overhead crane being overhauled in the front - rear direction, the maintenance personnel communicate with the crane driver, and then the crane driver controls the metallurgical overhead crane being overhauled to move in the front - rear direction.

[0016] Preferably, in step 1), ground personnel use iron wire to tie and fix the steel wire rope on the first hook group.

[0017] Preferably, in step 2), when the first hook is below 75 tons, the hoisting tool is a hoisting belt;

[0018] When the first hook is above 75 tons, the hoisting tool is made of steel plates and shackles.

[0019] Preferably, in step 5), specifically overhaul the brake, coupling, high - speed shaft, fixed pulley, drum and reducer in the first hoisting mechanism.

[0020] The present application has achieved the following beneficial technical effects:

[0021] 1). The present application utilizes the structural characteristics of the double hooks of the metallurgical overhead crane. One hook of the metallurgical overhead crane is used with a lifting tool to lift the other hook off the ground, enabling the metallurgical overhead crane under maintenance to move forward and backward normally. When other metallurgical overhead cranes come head-on, the metallurgical overhead crane under repair can move forward and backward to avoid other oncoming metallurgical overhead cranes, thus not affecting the normal lifting operations of other metallurgical overhead cranes, ensuring production, maximizing output, changing the production mode from passive to active, being a pioneer in the industry, laying a solid foundation for high-efficiency and high-output of converter continuous casting, and eliminating the time waste and potential hazards of tipping and collision caused by the hook landing on the ground, saving time and ensuring operation safety.

[0022] 2). The present application protects the wire rope from wear, can extend the service life of the wire rope by 1 - 2 months, and saves the cost of the wire rope by about 10,000 yuan per year.

[0023] 3). When replacing the fixed pulley of the hoisting mechanism in the present application, it is necessary for personnel to manually shift the wire rope weighing up to 50 kg horizontally. After adopting the method of the present application, the weight is reduced by 30 kg, reducing the labor intensity of personnel.

[0024] 4). In the present application, the hook group does not need to fall to the ground, ensuring the passage of ground metallurgical transport vehicles.

[0025] 5). The present application eliminates ground pollution, ensures a clean ground, and does not require personnel to waste time cleaning the sludge contaminated by the wire rope on the ground, reducing the labor intensity of employees and improving the hygiene condition of the site.

[0026] 6). In the present application, the metallurgical overhead crane can operate during maintenance without affecting normal production, achieving the purpose of increasing output, reducing costs, and increasing efficiency.

[0027] 7). In the present application, the steel output of the 120t converter system increases by 300t per hour. The total annual maintenance time is 20 hours, and 6000t of steel can be directly increased in production. Specific embodiments

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] The present application provides a method for conveniently overhauling the hoisting mechanism of a metallurgical overhead crane, including the following steps carried out in sequence:

[0030] 1) The metallurgical overhead crane includes a first hoisting mechanism and a second hoisting mechanism. The first hoisting mechanism includes a first hook group, and the second hoisting mechanism includes a second hook group;

[0031] Lower the first hook group of the first hoisting mechanism to be overhauled until the hook head of the first hook in the first hook group is 20 cm - 30 cm from the ground;

[0032] 2) Lower the second hook group until the hook head of the second hook in the second hook group is 150 cm - 160 cm from the ground, and then the ground personnel use a hoisting tool to connect the first hook and the second hook together;

[0033] 3) Lift the second hook group until it is 2 - 3 meters from the upper limit limit. The rising second hook group lifts the first hook group together, and control the hook head of the first hook to be 300 cm - 600 cm from the ground to prevent collision and scratching;

[0034] 4) The maintenance personnel cut off the power supply of the control cabinet of the first hoisting mechanism of the metallurgical overhead crane to stop the first hoisting mechanism;

[0035] And control other mechanisms including the second hoisting mechanism in the metallurgical overhead crane not to cut off the power supply to ensure normal operation;

[0036] 5) The maintenance personnel overhaul the first hoisting mechanism;

[0037] When it is necessary to move the metallurgical overhead crane being overhauled in the front - rear direction, the maintenance personnel communicate with the crane driver, and then the crane driver controls the metallurgical overhead crane being overhauled to move in the front - rear direction.

[0038] In an embodiment of the present application, in step 1), the ground personnel use iron wire to tie and fix the steel wire rope on the first hook group.

[0039] In an embodiment of the present application, in step 2), when the first hook is below 75 tons, the hoisting tool is a hoisting belt;

[0040] When the first hook is above 75 tons, the hoisting tool is made of steel plates and shackles.

[0041] In an embodiment of the present application, in step 5), specifically overhaul the brake, coupling, high - speed shaft, fixed pulley, drum and reducer in the first hoisting mechanism.

[0042] In this application, the hook block is one of the most common lifting tools in metallurgical bridge cranes. The hook block includes a hook and a pulley, and the hook is suspended on the wire rope of the hoisting mechanism by means of components such as a pulley block.

[0043] In this application, the first hoisting mechanism and the second hoisting mechanism cannot be overhauled simultaneously. Only the first hoisting mechanism located below can be overhauled. After the first hoisting mechanism is overhauled, the second hook is lifted by the first hook according to the same steps, and then the control cabinet of the second hoisting mechanism of the metallurgical bridge crane is powered off to stop the second hoisting mechanism. And other mechanisms including the first hoisting mechanism do not need to be powered off to ensure normal operation. Only the second hoisting mechanism located below is overhauled. Specifically, the brakes, couplings, high-speed shafts, fixed pulleys, drums, and speed reducers in the second hoisting mechanism are overhauled.

[0044] The methods and devices not described in detail in the present invention are all prior art and will not be elaborated here.

[0045] The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A method for conveniently overhauling the hoisting mechanism of a metallurgical overhead crane, characterized in that, it includes the following steps carried out in sequence: 1) The metallurgical overhead crane includes a first hoisting mechanism and a second hoisting mechanism. The first hoisting mechanism includes a first hook group, and the second hoisting mechanism includes a second hook group; Lower the first hook group of the first hoisting mechanism to be overhauled until the hook head of the first hook in the first hook group is 20 cm - 30 cm from the ground; 2) Lower the second hook group until the hook head of the second hook in the second hook group is 150 cm - 160 cm from the ground, and then the ground personnel use a lifting tool to connect the first hook and the second hook together; 3) Lift the second hook group until it is 2 - 3 meters from the upper limit limit. The ascending second hook group lifts the first hook group together, and control the hook head of the first hook to be 300 cm - 600 cm from the ground to prevent the hook head of the first hook from being damaged or scratched; 4) The maintenance personnel cut off the power supply of the control cabinet of the first hoisting mechanism of the metallurgical overhead crane to stop the first hoisting mechanism; And control other mechanisms including the second hoisting mechanism to keep running without power cut-off; 5) The maintenance personnel overhaul the first hoisting mechanism; When it is necessary to move the metallurgical overhead crane being overhauled in the front and back directions, the maintenance personnel contact and communicate with the crane driver, and then the crane driver controls the metallurgical overhead crane being overhauled to move in the front and back directions.

2. A method for conveniently overhauling the hoisting mechanism of a metallurgical overhead crane according to claim 1, characterized in that, in step 1), the ground personnel use iron wire to tie and fix the steel wire rope on the first hook group.

3. A method for conveniently overhauling the hoisting mechanism of a metallurgical overhead crane according to claim 1, characterized in that, in step 2), when the first hook is below 75 tons, the lifting tool is a sling; when the first hook is above 75 tons, the lifting tool is made of steel plates and shackles.

4. A method for conveniently overhauling the hoisting mechanism of a metallurgical overhead crane according to claim 1, characterized in that, in step 5), specifically overhaul the brake, coupling, high-speed shaft, fixed pulley, drum and reducer in the first hoisting mechanism.