PAJ Type Low-Profile Balancer for Machine Tool Loading

The PAJ series low-profile balancer is a lightweight material handling device that utilizes the parallelogram scaling principle to achieve precise positioning with simplicity and flexibility. A screw lifting mechanism raises and lowers loads, replacing manual labor and reducing operator physical strain. The PAJ series includes four low-profile balancer models: PAJ225B (200kg), PAJ325B (300kg), PAJ525B (500kg), and PAJ625B (600kg).

With its sound design, easy operation, reliable performance, and simple maintenance, the PAJ low-profile balancer is widely used for machine tool loading/unloading in workshops, workpiece transfer between processes and along production lines, component assembly, and short-distance, high-frequency handling operations at stations, docks, warehouses, and similar venues. By leveraging the principle of gravity balancing, the balancer delivers smooth motion with effortless, intuitive control — making it especially well-suited for workstations involving frequent Handling and assembly tasks. It significantly reduces labor intensity and boosts work efficiency.

Parallelogram Scaling for Precision Positioning: Built on the parallelogram scaling principle, the suspended load floats freely in three-dimensional space within the rated travel range. Horizontal movement, vertical travel, and rotation are all accomplished manually with ease, and the load remains stably suspended at any position upon release.

Low-Profile Design for Restricted Headroom: With a maximum height of only 2850mm, the PAJ is better suited for facilities with limited workshop height than the PDJ tall-type balancer (3650mm). A maximum lifting height of 1900–2000mm readily handles frequent machine-side loading and unloading.

Effortless Operation, Easy Assembly: The load floats freely in three-dimensional space within its rated travel range. All control buttons are integrated into the Control Grip — simply move the grip and the workpiece follows, making operation straightforward and intuitive. A single operator can complete handling tasks with ease.

Extensive Coverage: With a maximum Working Radius of R2=2500mm, a horizontal travel of 1840–1850mm, and a 340° Rotation angle, the balancer covers virtually the entire working area around the Column.

The PAJ low-profile balancer operates on the parallelogram scaling principle combined with a screw lifting mechanism. Its main structure consists of a Column, a parallelogram arm assembly, a screw lifter, and a Hook block. The parallelogram arms are hinged to form a deformable four-bar linkage: as the load moves horizontally, the linkage scales while keeping the Hook block traveling along a strictly vertical line, maintaining the load in a suspended, balanced state within three-dimensional space.

To operate, the operator simply holds the Control Grip and pushes or pulls gently — the load follows immediately. Horizontal movement is accommodated by the scaling of the parallelogram arms, while rotation is achieved through the Column's 340° Slewing. Pressing the buttons on the grip controls the screw lifter's forward and reverse rotation for smooth load raising and lowering. All controls are conveniently located on the grip, which is linked to the workpiece via a Fixture — move the grip and the workpiece responds instantly, making operation simple and highly efficient.

The balancer consists of the following core components:

Column and Slewing mechanism: A low-profile steel Column (Hmax=2850mm) with a top Slewing bearing that supports 340° arm Rotation — ideal for installation in low-ceiling Factory buildings.

Parallelogram Arm Assembly: A four-bar parallelogram linkage with a horizontal travel of 1840–1850mm, R1=650–660mm, and R2=2500mm, providing extensive workspace coverage.

Screw Lifter: A Motor-driven lead screw raises and lowers the nut for smooth, self-locking motion. Hoisting speed is 6.1–7m/min, with a slight reduction as the load increases.

Integrated Grip Controller: All control buttons are mounted on the grip, which connects to the workpiece via a Fixture — move the grip and the workpiece follows, offering intuitive, convenient operation.

Safety protection device: An Overload Protector and Limit switches at travel extremes provide dual-layer safety protection.

Machine Tool Loading/Unloading: The low-profile design, with a maximum height (Hmax) of only 2850mm, fits perfectly in tight spaces beside machine tools. For workpieces weighing between 200kg and 600kg, the PAJ Balancer glides into position with minimal effort.

Inter-Process Workpiece Transfer: For short-distance transfer and positioning of workpieces between machining processes, the PAJ series offers a horizontal travel of 1840–1850mm and 340° slewing coverage, easily reaching adjacent process areas.

Component Assembly: Ideal for assembling medium-sized components on mechanical assembly lines. The Balancer suspends the workpiece in three-dimensional space, allowing operators to align and fit parts with ease, boosting both assembly efficiency and quality.

High-Density Lifting in Warehouses: Designed for short-distance, high-frequency lifting tasks in railway stations, docks, and warehouses. The Balancer delivers effortless, rapid operation that keeps pace with demanding work cycles.

By Load Capacity: Choose PAJ225B for 200kg, PAJ325B for 300kg, PAJ525B for 500kg, and PAJ625B for 600kg. PAJ225B/325B share a lifting height of 1900mm, while PAJ525B/625B share a lifting height of 2000mm.

By Installation Height: The low-profile Balancer has a maximum height (Hmax) of 2850mm, making it suitable for low-ceiling workshops with a clear height of 3–4m. If the installation height is ≥3650mm, consider the PDJ high-profile model for a greater lifting range.

By Duty Cycle: For high-frequency, short-distance lifting, the PAJ low-profile Balancer offers effortless control and quick response. For longer transfer distances, optional slewing rails or mobile bases are available.

Henan Kelude Heavy Industry Co., Ltd. provides end-to-end services for the PAJ series low-profile Balancer, covering sales, installation, and after-sales support.

Quality Testing: Each unit undergoes a static test with 1.25 times the rated load before shipment. The parallelogram arm is subjected to repeated extension and retraction cycles to ensure smooth operation, and the screw lifting mechanism is endurance-tested through continuous lifting cycles.

After-Sales Warranty: Full Machine Warranty for 12 months, with extended 24-month coverage on the screw lift and motor. After-sales requests are addressed within 48 hours.

Need a quotation for the PAJ low-profile Balancer?

Share your load capacity, installation height, and application details, and we'll tailor a solution for you within 2 hours.

Consultation Hotline: 13903802779

Q: How do I choose between the PAJ low-profile Balancer and the PDJ high-profile model?

It mainly depends on the installation height. The PAJ low-profile model has an Hmax of 2850mm, making it suitable for low-ceiling workshops with clear heights of 3–4m. The PDJ high-profile model has an Hmax of 3650mm, designed for standard factory buildings (clear height ≥4m). If installation height is not a constraint, the PDJ high-profile model offers a greater lifting range, with R2 reaching 2500mm for PDJ025–225. The PAJ low-profile model features a more compact structure, ideal for space-constrained applications.

Q: What does the letter B at the end of PAJ model numbers mean?

The B at the end of PAJ model numbers (e.g., PAJ225B, PAJ525B) indicates the low-profile configuration. PDJ series models without a letter suffix are standard high-profile units, while those with an A suffix (PDJ-A) are low-profile versions. When selecting a model, be sure to distinguish between the B series and the standard series to match your installation height.

Q: Does the screw lift mechanism on the Balancer self-lock? Will the load drop during a power outage?

The screw lift mechanism uses a lead screw and nut transmission, offering excellent self-locking performance. The helix angle of the lead screw is smaller than the friction angle, so it will not reverse under load. Even in the event of a sudden power failure, the load will not slip, providing greater safety than the friction braking system of a standard electric hoist.

Q: Can the fixtures on the PAJ Balancer be replaced?

Yes. The handle and fixture on the PAJ Balancer are designed as an integrated unit, allowing you to swap in different types of lifting spreaders, fixtures, or suction cups based on the shape and material of the workpiece being lifted. Replacement is quick and easy, enabling a single Balancer to handle a wide variety of hoisting tasks.

Q: Can the Balancer be used on uneven floors?

The base of the PAJ Balancer must be secured to a flat, hardened floor. If the floor is uneven, leveling shims can be added beneath the base for adjustment. A floor levelness of ≤3mm/m is recommended. The verticality of the column installation directly affects the operating flexibility and service life of the equipment.