The applicable plan for emulsion crane hoists should revolve around safe operation, equipment selection, maintenance management, and application scenarios. The specific plan and analysis are as follows:

1、 Safety operation standards

Load limit

Core principle: Overloading is strictly prohibited, and the rated load must strictly follow the equipment nameplate identification. Only brief overloading is allowed in the initial inspection load testing procedure.

Analysis: Overloading is the main cause of structural damage, wire rope breakage, or brake failure in cranes, which may lead to falling object accidents. For example, if a 3-ton emulsion chain crane is overloaded to 4 tons for a long time, it will accelerate gear wear and shorten equipment life.

Operator Qualification

Requirement: Operators must undergo professional training and be familiar with the characteristics of emulsion systems (such as pressure control, leak handling) and emergency shutdown procedures.

Analysis: Emulsion cranes are commonly used in high-risk environments such as coal mines, and operational errors may lead to hydraulic system failures or personnel injuries.

Load hover management

Regulation: When the load is hovering, the operator shall not leave the control position; After adjustment or repair, protective devices need to be reinstalled and safety equipment activated before operation.

Analysis: During the suspension of the load, the equipment may experience displacement due to hydraulic fluctuations or external impact, and the operator can intervene in a timely manner if present.

2、 Equipment selection and adaptation

Type Selection

Emulsion Chain Crane: Suitable for comprehensive mining faces in coal mines, it uses emulsion to drive chain wheels to lift heavy objects, has strong anti pollution ability, and is suitable for harsh working conditions.

Electric or pneumatic crane: If the environment allows for electric/compressed air supply, it can be preferred as it has higher control accuracy but requires explosion-proof design.

Analysis: In coal mine scenarios, emulsion driven equipment should be prioritized to avoid electrical sparks causing explosions; Electric cranes can be used in clean workshops to improve efficiency.

Load level matching

Standard: According to ASME H3/H4 grade selection, H3 is suitable for medium frequency use (such as several times a day), and H4 is suitable for high frequency use (such as several times per hour).

Analysis: If the equipment needs to operate continuously for 24 hours, an H5 level crane should be selected, otherwise it may cause brake failure due to overheating.

Suspension design

Single beam crane: suitable for light load and short span scenarios, with low cost and flexible installation.

Double beam crane: suitable for heavy-duty and long-span scenarios, with stronger structural stability.

Analysis: Due to the limited width of coal mine tunnels, single beam emulsion cranes are more space saving; The shipyard requires double beam cranes to lift large sections.

3、 Maintenance and overhaul plan

routine inspection

Content: Check the emulsion level, pressure gauge reading, chain/wire rope wear, and brake sensitivity.

Frequency: Conducted before each shift and recorded data.

Analysis: Emulsion leakage may cause insufficient pressure in the hydraulic system, leading to a decrease in load; Chain wear exceeding the standard (such as over 10% of the original diameter) needs to be replaced immediately.

regular maintenance

Cycle: Conduct a comprehensive maintenance every 3 months, including replacing emulsion, cleaning filters, and lubricating gearboxes.

Analysis: Deterioration of emulsion can corrode seals and cause internal leakage; Filter blockage can cause system pressure fluctuations.

Emergency handling of faults

Process: Develop contingency plans for hydraulic system leaks, brake failures, etc., equipped with backup hydraulic pumps and emergency stop devices.

Analysis: The risk of coal mine collapse is high, and failure to address the issue within 3 minutes may result in serious consequences.

4、 Application scenario adaptation

Comprehensive mining face of coal mine

Solution: Adopt explosion-proof emulsion chain crane, equipped with emulsion pump station, to achieve linkage control with coal mining machine and scraper conveyor.

Advantages: The emulsion drive does not require an electrical system, avoiding the risk of gas explosions; Chain structure has strong impact resistance.

Metal pressure processing workshop

Solution: Choose an electric double beam crane, equipped with high-precision load sensors and variable frequency speed regulation system.

Advantages: Electric cranes have high control accuracy and are suitable for lifting precision molds; The double beam structure can cover the area of large heating furnaces.

Dangerous areas (such as chemical workshops)

Solution: Adopt pneumatic emulsion mixed drive crane, equipped with explosion-proof motor and positive pressure ventilation system.

Advantages: The pneumatic system has no risk of electric sparks, and emulsion lubrication can reduce equipment wear.

The main equipment produced by Hebei Makita: stage electric hoist, electric chian hoist, wire rope electric hoist，Hand chain hoist, lever hoist, pneumatic hoist and other lifting equipment