BZL Double Cantilever Crane for Heavy-Duty Lifting
Product Introduction
The BZL double-arm jib crane (also known as a twin-boom jib crane or double-arm cantilever crane) is a new type of lifting equipment developed from the single-arm jib crane. This jib crane features two independent jib arms mounted on a single column, each operating independently without interference. This design significantly saves installation space, allowing one column to serve two workstations simultaneously. The standard slewing angle for each arm is 90° (180° total coverage), but offset installation can achieve a larger combined slewing angle. Lifting capacity ranges from 0.125t to 5t per arm, with cantilever lengths of 3 to 5 meters and a standard lifting height of 3 meters.
The BZL double-arm jib crane is widely used for material handling in factories, workshops, production lines, assembly lines, warehouses, and docks. The dual-arm design enables a single unit to cover two adjacent workstations, saving approximately 40% in floor space and 30% in equipment investment compared to installing two separate single-arm jib cranes. Each arm operates completely independently, allowing simultaneous lifting operations without any mutual interference.
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Product Features
One Column, Two Arms, Space-Saving: A single column supports two independent jib arms, saving approximately 40% in installation space compared to two separate single-arm jib cranes. Ideal for workshops with limited floor space that require simultaneous lifting at two adjacent workstations.
Fully Independent, Zero Interference: Each arm rotates and operates independently, equipped with its own electric hoist and electrical control system. Simultaneous operation of both arms has no effect on the other, ensuring uninterrupted workflow.
Flexible Installation, Adjustable Angles: Each arm has a standard slewing angle of 90° (180° combined coverage). Offset installation is also available to adjust the arm angles, covering a larger working area to suit different workstation layouts.
Cost-Effective, One Machine for Two Stations: Compared to two separate single-arm jib cranes, the double-arm design eliminates the cost of one column and base, reducing equipment investment by approximately 30%. It also reduces installation work and shortens the installation period.
Manual or Electric Slewing: Each arm offers a choice of manual or electric slewing. Light-duty models can be rotated by hand, while heavy-duty models are equipped with a dedicated slewing motor for effortless operation.
Working Principle
The BZL double-arm jib crane operates on a column + dual-arm + dual-hoist structure. A single column is fixed to a ground foundation or mounted on a base. Two independent slewing mechanisms are installed at the top of the column, each connected to a separate jib arm. Each arm is fitted with its own chain electric hoist for vertical lifting and horizontal movement of loads at its respective workstation. Although both arms share one column, their electrical and control systems are completely independent, allowing simultaneous or separate operation.
During operation, each arm works independently. The operator at the left workstation uses the remote control to position the left hoist over the load, lifts it, and then slews the left arm to the target location for unloading. Meanwhile, the operator at the right workstation can independently operate the right arm for a completely different lifting task. Each arm typically provides 90° of slewing, together covering a semicircular area on each side of the column. With offset installation, the arms can cover a larger combined angle.
Structural Composition
The crane consists of the following core components:
Column and Base: A steel pipe column fixed to a floor base or embedded foundation, supporting the full load of both jib arms. The column strength is verified under double-load conditions to ensure safety and reliability even when both arms are fully loaded simultaneously.
Dual Jib Arms: Two independent cantilever arms, each mounted on a slewing mechanism on opposite sides of the column. Cantilever lengths range from 3 to 5 meters, constructed with I-beam or H-beam sections. The lower flange of each arm serves as the travel rail for the electric hoist.
Dual Slewing Mechanisms: Two independent slewing bearings and drive units are installed at the top of the column, enabling each arm to slew 90° (180° total). Available with manual or electric slewing options.
Dual Chain Electric Hoists: Each arm is equipped with an independent chain electric hoist that travels along the cantilever for horizontal movement and performs vertical lifting. The two hoists are electrically isolated and can operate simultaneously.
Dual Electrical Control Systems: Two independent remote controls or pendants operate the hoist lifting, horizontal travel, and arm slewing for the left and right arms respectively. The electrical systems are wired separately to ensure zero interference.
Technical Parameters
| Model | single-arm rated Lifting Capacity(t) |
total of both arms fixed Lifting Capacity(t) |
Cantilever Lengthdegrees L(m) |
Lifting Height h(m) |
single arm Slewing Angle(°) |
Lifting Speed (m/min) |
|---|---|---|---|---|---|---|
| BZL0.125 | 0.125 | 0.25 | 3~4 | 3 | 90 | 8/2 |
| BZL0.25 | 0.25 | 0.5 | 3~5 | 3 | 90 | 8/2 |
| BZL0.5 | 0.5 | 1 | 3~5 | 3 | 90 | 8/2 |
| BZL1 | 1 | 2 | 3~5 | 3 | 90 | 8/2 |
| BZL2 | 2 | 4 | 3~4 | 3 | 90 | 4/1 |
| BZL3 | 3 | 6 | 3~4 | 3 | 90 | 4 |
| BZL5 | 5 | 10 | 3 | 3 | 90 | 4 |
Note: The total rated lifting capacity of the double-arm model equals the rated lifting capacity of a single arm × 2. In actual operation, both arms must not simultaneously lift loads exceeding their respective rated capacities. For lifting speed, values before and after the slash represent fast/slow dual speeds respectively.
Applications
Two-Side Workstation Hoisting on Production Lines: When a production line requires hoisting at workstations on both sides, the BZL double-arm crane is mounted on a central column, with each arm serving one side. One machine handles two positions, maximizing floor space efficiency.
Adjacent Operations on Assembly Lines: When two consecutive assembly operations are positioned close together, the double-arm crane allows each arm to serve a different stage — the left arm unloads from the upstream station while the right arm loads the downstream station, keeping the line running continuously.
Loading/Unloading on Both Sides of Warehouse Aisles: Installed in the middle of a warehouse aisle, the double-arm crane covers racking areas on both sides, allowing one unit to handle storage and retrieval on either side — eliminating the need for redundant equipment investment.
Adjacent Bays in Maintenance Areas: For heavy component handling at two neighboring maintenance bays, the double-arm crane shares a single column to save space, while two operators work independently without interference.
Selection Guide
Select by Single-Arm Capacity: The total rated load of the double-arm model equals the single-arm rated load × 2. When selecting, first determine the maximum load at each individual workstation and choose the corresponding model. For example, if the maximum load on one side is 0.5t, select the BZL0.5 (total rated capacity of both arms is 1t, but both arms must not operate at full load simultaneously).
Select by Working Range: Cantilever lengths from 3 to 5m are available. The standard coverage for the double-arm model is a 90° arc on each side of the column. For a wider coverage angle, an offset installation arrangement can be used, where the two arms are mounted at staggered angles.
Column Mounting Options: The BZL double-arm crane column can be installed with a floor-mounted base or a pre-embedded foundation. Floor mounting allows for easy relocation, while embedded installation offers greater stability. For larger-capacity models (BZL3~BZL5), embedded installation is recommended to ensure stability.
Manufacturer Services
Henan Kelude Heavy Industry Co., Ltd. provides end-to-end services for the BZL double-arm jib crane, including manufacturing, installation, and after-sales support.
Quality Testing: Before shipment, the column undergoes a static load test at double the rated load (simulating both arms at full capacity simultaneously), and each arm is individually tested at 1.25 times its rated load, ensuring the complete unit is safe and reliable.
Installation Services: We provide foundation construction guidance or floor-mounted base installation. Both arms are individually calibrated for levelness and slewing smoothness, and the dual electrical systems are commissioned independently.
After-Sales Warranty: Full machine warranty for 12 months, with the electric hoist and slewing mechanism covered for 24 months. After-sales requests are responded to within 48 hours.
Request a Quotation
Need a quotation for the BZL double-arm crane?
Provide the single-arm capacity, cantilever length, distance between the two workstations, and whether electric slewing is required — we will tailor a solution for you within 2 hours.
Consultation Hotline: 13903802779
FAQ
Q: Can both arms of the BZL double-arm crane work simultaneously? Will they interfere with each other?
A: Both arms can operate independently at the same time without interference. Each arm has its own slewing mechanism, electric hoist, and electrical control system. However, both arms must not lift loads exceeding their respective rated capacities simultaneously, and care should be taken to prevent the arms from colliding. The design maintains sufficient clearance between the two arms.
Q: Is a double-arm jib crane more cost-effective than two single-arm jib cranes?
A: Yes, a double-arm jib crane is more cost-effective. One BZL double-arm jib crane saves approximately 40% floor space, 30% equipment investment, and 50% installation work compared to two independent single-arm jib cranes. However, the two workstations of a double-arm crane must be positioned within a relatively fixed range on opposite sides of the column, whereas two single-arm cranes can be installed at separate locations.
Q: Is a 90° slewing range per arm sufficient? Can the angle be increased?
A: The standard configuration provides 90° slewing per arm (180° total across both sides), covering the semicircular areas on each side of the column. For a larger coverage area, an offset mounting arrangement can be used, where the two arms are installed at staggered angles on the column, increasing the total coverage to 270° or even 360°. The specific solution depends on the on-site workstation layout.
Q: Can the BZL double-arm jib crane be equipped with electric slewing?
A: Yes. Each arm can be independently fitted with an electric slewing device, with slewing motor power ranging from 0.37 to 1.1 kW. Manual slewing is recommended for BZL1 and below (easy push-pull operation under light loads), while electric slewing is recommended for BZL2 and above. The two electric slewing systems are controlled independently.
Q: How are the foundation and column of the double-arm jib crane designed?
A: The column is made of thick-walled steel pipe, with a diameter of approximately 219mm for BZL0.125 to BZL0.5, approximately 273mm for BZL1 to BZL3, and approximately 325mm for BZL5. The base or embedded anchor bolts are designed based on the total load to ensure the column remains stable with no tipping risk when both arms are fully loaded simultaneously. Foundation design drawings are provided for customer reference during installation.
