1. Technical Background and Product Positioning

The vertical-loop hoist is a specialized lifting device developed by Zhengzhou Rongjing Mechanical Equipment Co., Ltd. for applications such as construction, material hoisting, and mining operations. The machine adopts vertical structure design, through the circulating drum to achieve continuous rewinding of the wire rope, with compact structure, high space utilization, stable operation and other characteristics. Compared with the traditional winch, its circulating drum design can reduce wire rope wear, prolong service life, while supporting multi-angle installation, adapt to the needs of narrow space operation. The product specification covers the pulling force range of 5 tons to 50 tons, and the speed adjustment range is 0.5-15 m/min, which can match the lifting efficiency requirements of different working conditions.

2. Technical Architecture and Core Advantages

1. Power system: Adopt dual-motor drive scheme, the main motor provides basic power, and the auxiliary motor realizes speed fine adjustment. The motor power range is 7.5 kW-75kW, which is suitable for different pulling force requirements, supports frequency conversion speed regulation function, and can realize 0.1Hz precision control.
2. Braking system: Equipping electromagnetic brake and mechanical brake with dual redundant design, braking response time ≤ 0.2 seconds, safety factor up to 1.5 times the rated load. The brake pads are made of wear-resistant alloy material and have a service life of more than 500000 operations.
3. drum structure: The circulating reel is forged with high-strength alloy steel, and the surface is quenched and the hardness reaches HRC45-50. The drum diameter is designed according to the pulling force requirement. The drum diameter of the 5-ton model is 300mm, and the drum diameter of the 50-ton model is 800mm to ensure the uniformity of wire rope winding.
4. Control systemSupport PLC remote control and local operation dual mode, equipped with torque limiter and overload protection device, can monitor the running state in real time. Control cabinet protection grade IP54, adapt to outdoor harsh environment.

3. Typical Application Scenarios and Cases

Scenario 1: Hoisting of mining materials
In a copper mine project in Yunnan, the 20-ton vertical circulating winch provided by Zhengzhou Rongjing Machinery is used for underground ore lifting. The project requires the equipment to have explosion-proof performance and continuous operation capability. The technical team adapts through the following optimizations:
-Motor protection level upgraded to IP65, equipped with explosion-proof motor and explosion-proof control cabinet;
-The surface of the drum is increased with wear-resistant coating to adapt to the wear of ore particles;
-The braking system adds a heat sink to support 24 hours of continuous operation.
After the implementation of the project, the average daily lifting capacity of the equipment reaches 150 tons, and the failure rate is less than 0.5, which is 30% higher than the efficiency of the traditional winch.

Scenario 2: Construction Vertical Transportation
In a super high-rise building project in Shenzhen, a 10-ton vertical circulating winch is used for vertical transportation of materials. The difficulty of the project lies in the limited space and multi-floor collaborative work. The solutions include:
-Adopt vertical compact design, the equipment covers an area of only 1.2 ㎡, and is suitable for elevator shaft installation;During the project period, the equipment transported more than 5000 tons of materials, no safety accidents occurred, and was evaluated by the construction party as "efficient and reliable.

4. Technical Parameters and Selection Guide

The selection of vertical circulating winch requires comprehensive consideration of three elements: tension, speed and installation space. The following are key parameter references:
| Model | Rated tension (ton) | Speed range (m/min) | Motor power (kW) | Reel diameter (mm) | Applicable scenarios |
|------------|----------------|------------------|----------------|----------------|------------------------|
| RJ-L5 | 5 | 0.5-8 | 7.5 | 300 | Material Handling in Narrow Space |
| RJ-L20 | 20 | 1-12 | 30 | 600 | Mine Lifting |
| RJ-L50 | 50 | 2-15 | 75 | 800 | LARGERS |
Selection recommendations:
-Tension demand: According to the load weight selection, it is recommended to reserve 20% safety margin;
-Speed requirements: high-speed models are selected for high-frequency transportation and low-speed models are selected for precise positioning;
-Installation space: vertical machine height requirements are higher, need to measure the net height of the work area in advance.

5. Maintenance and Troubleshooting

Key Points for Daily Maintenance：
-Wire rope inspection: daily inspection of wear, lubrication cycle every 50 hours;
-Brake debugging: test the braking distance every month to ensure that the response is ≤ 0.2 seconds;
-Motor heat dissipation: clean the motor cooling fan every quarter to prevent dust accumulation.
Common Troubleshooting：
-Fault 1: The reel is stuck
Possible causes: wire rope winding disorder or drum bearing damage
Solution: Rope rearrangement after shutdown and bearing replacement (model 6208)
-Fault 2: Unstable speed
Possible reasons: inverter parameter error or motor carbon brush wear
Solution: Reset the inverter parameters (P0.01 = 1), replace the carbon brush (model D172)

6. FAQ Technical Q&A

Q1: What are the main differences between vertical-loop winches and horizontal-type winches?
A: The vertical model adopts the vertical reel design, which has high space utilization and is suitable for narrow spaces; the horizontal model reel is placed horizontally, with greater tension, but it covers a large area. The vertical model of Zhengzhou Rongjing Machinery optimizes the drum structure, while maintaining compactness, the pulling force range can reach 50 tons, taking into account the space and performance requirements.

Q2: How to choose the explosion-proof model suitable for mine operation?
A: Mine operation needs to choose the model with explosion-proof grade above ExdIIBT4, and the motor power needs to be calculated according to the well depth and load. For example, when the well depth is 200 meters and the load is 15 tons, it is recommended to choose the RJ-L20 explosion-proof type, the motor power is 30kW, and the double brake system and explosion-proof control cabinet can meet the safety requirements.

Q3: How long is the life of the equipment? How to extend the service life?
A: Under the standard use and regular maintenance, the equipment life can reach more than 10 years. The key to extending life is:
-Avoid overload operation, and the safety factor shall be ≥ 1.25;
-In-depth maintenance every month, including gear box oil change (Shell Omala S4 GX 320 is recommended);
-Preheat the motor before winter operation to prevent cold start damage.