Choosing a manual hoist requires comprehensive consideration of five core dimensions: application scenarios, parameter matching, environmental adaptability, safety performance, and maintenance costs. Based on professional selection logic and combined with special scenario requirements such as tunnel construction, a systematic solution is provided

1. Clarify application scenarios and requirements

Job types: vertical lifting (such as hoisting steel structures in tunnels), horizontal traction (such as transporting shield machine components), diagonal handling (such as erecting chilled water pipes). It is necessary to select the corresponding structure of hand cranked hoist (loop chain/wire rope type) or hand pulled hoist according to the specific direction of operation (vertical/horizontal/diagonal).

Environmental characteristics:

Wet/corrosive environment: Choose stainless steel chains, nickel plated hardened treatment or IP65 waterproof type, and regularly apply rust proof grease.

Dust/high temperature environment: Sealed bearing design is used for dust prevention, and high-temperature resistant lubricating grease (such as lithium based grease) is used to cope with high temperatures. Explosion proof type (Ex standard) is used for oil and gas tunnels.

Space limited scenario: Compact hand cranked hoist (small size, flexible operation) suitable for narrow tunnel areas.

2. Precise matching of core parameters

Lifting capacity and lifting height:

The lifting capacity should cover 1.2-1.5 times the actual load (if the actual load is 1 ton, choose the 1.2-1.5 ton model) to avoid overloading; Tunnels commonly use 1-10 tons, while mining/construction scenarios can reach 30-50 tons.

The lifting height is customized according to the operational requirements (standard 2.5-12 meters, expandable to over 15 meters in tunnels), taking into account the matching relationship between chain length and sprocket diameter.

Job level and hand tension:

High strength alloy steel chains (tensile strength ≥ 800MPa) are required for work level Z (frequent heavy load use); Q-grade (light load not frequently used) can be made of ordinary carbon steel.

Hand pulling force ≤ 300N when fully loaded, to avoid operational fatigue; The dual chain design enhances stability and reduces the risk of uneven stress on a single chain.

3. Structural optimization and safety devices

Materials and processes:

The chain adopts double stage heat treatment of isothermal quenching and low-temperature tempering, which improves its wear resistance by 60% (for example, the wear of Chenghua chain hoist chain is only 0.2mm/3000 hours).

The hook is made of forged steel as a whole (with a breaking force of 5 times the rated load), and the shell is made of HT200 high-strength cast iron (wall thickness error ≤ 0.5mm, impact strength 120kJ/m ²).

Braking system and safety device:

Ratchet and pawl one-way brake (sliding amount ≤ 5mm, better than the national standard 15mm), dual pawl design improves braking reliability; Friction disc brakes prevent heavy objects from falling freely through a self-locking mechanism.

Integrated overload protection (automatic shutdown when the load exceeds 10%), height limit infrared sensing, emergency switch and isolation switch, in compliance with CE/CMA certification; The intelligent model is equipped with high-precision sensors and handheld controllers to achieve real-time monitoring of weight and speed, as well as uniform descent control.

4. Maintenance and long-term reliability

Daily maintenance:

Clean the gourd after use, apply rust proof grease, and store it in a dry and ventilated place; Regularly lubricate the chain (such as rust proof grease) to avoid chain jamming or corrosion.

Regularly conduct no-load operation checks (each mechanism operates flexibly without jamming) and static load tests (maintain 1.25 times the rated load for 10 minutes without slipping); At least one comprehensive dismantling inspection and dynamic load test shall be conducted annually.

Long term storage and maintenance:

Long term storage should be coated with rust proof grease and placed in a dry and ventilated place; Disconnect the main isolation switch during maintenance to ensure personnel safety; The welding points must comply with the "Code for Acceptance of Welding of Pressure Pipelines", ensuring no stress and a smooth groove.

5. Customized solutions for special scenarios

Tunnel construction:

Choose explosion-proof (Ex standard) or waterproof (IP65) manual hoists to adapt to humid and dusty environments; Adopting a dual hoist collaborative lifting scheme (load sharing, dedicated person command) to enhance operational safety.

Select high-temperature resistant lubricating grease and heat dissipation design for high-temperature environments; Compact hand cranked hoists are used in narrow areas to reduce space occupation.

Mining/Building Scene:

Select Z-level working level and high-strength alloy steel chain for heavy-duty scenarios; The inclined handling adopts a wire rope type hand cranked hoist, which achieves smooth traction through alternating clamping with clamps.

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