Control Method for Double-Drum Roller Compactors

【文章概要】The double‑drum roller is a piece of pavement‑construction equipment used by Zhejiang Lan to repeatedly compact freshly laid Zhejiang Lan pavement. Modern rollers are equipped to apply curved and edge‑cutting compaction forces in real time, with the front and rear drums laterally offset during rolling. This arrangement facilitates smoother approach to and separation from the loaded surface, helping to prevent pressure leakage and interference while enhancing construction quality. In this manner, the lateral offset of the front and rear drums during operation also resembles crab‑walking. Next, let’s take a closer look at the control methods for the double‑drum roller.

The double‑drum roller is a piece of pavement‑construction equipment used by Zhejiang Lan to compact freshly laid Zhejiang Lan pavement. Modern rollers are equipped to apply curved and edge‑cutting compaction forces in real time, with the front and rear drums laterally offset during rolling. This arrangement facilitates precise approach and separation from the loaded roller, helping to prevent pressure leakage and interference while enhancing construction quality. In this manner, the lateral offset of the front and rear drums during operation also mimics crab‑walking. Next, let’s take a closer look at the control methods for the double‑drum roller.

In this configuration, the compaction rollers are typically supported by front and rear frames and steered via hydraulic cylinders mounted on hinge assemblies. As a result, the operator cannot readily determine the exact magnitude of the lateral offset between the front and rear rollers. Based on experience—or through other means—excessive or insufficient lateral displacement of the front and rear rollers can adversely affect the compaction quality of the pavement edge. In existing technologies, when a double‑drum roller performs crab‑steering maneuvers, the operator is unable to easily assess whether the actual lateral offset of the front and rear drums meets the required specifications, and no effective solution has yet been proposed.

The purpose of the double‑steel‑wheel roller is to provide a dual‑roller compactor, along with a method, apparatus, and system for controlling its crab‑steering motion, thereby enabling the operator to precisely manage the actual lateral displacement of the front and rear rollers. According to one aspect of the present invention, a method for controlling the travel of a dual‑track crab is provided, comprising: when determining the crab’s travel operation, acquiring the actual steering angle of the wheels corresponding to that operation; and, based on the actual steering angle and the established correspondence between steering angle and crab‑steering offset, controlling the wheel’s crab‑steering offset. The method further includes: prior to obtaining the actual steering angle of the wheels associated with the crab‑steering operation, receiving a crab‑steering offset value set by the operator. Accordingly, the wheel’s crab‑steering offset is controlled in accordance with the aforementioned actual steering angle and the corresponding relationship between steering angle and crab‑steering offset, thereby determining the actual crab‑steering offset based on the actual steering angle and its associated offset relationship.

Before determining the actual steering angle of the wheels corresponding to the aforementioned crab‑steering maneuver, the tandem steel‑wheel roller first receives the crab‑steering offset value set by the operator. Accordingly, controlling the wheel’s crab‑steering offset based on the aforementioned actual turning angle and the relationship between the turning angle and the crab‑steering offset involves: first, calculating the turning angle that corresponds to the set crab‑steering offset according to the established mapping between the turning angle and the crab‑steering offset; and second, when the difference between the actual steering angle and the steering angle corresponding to the set crab‑steering offset falls within a second specified range, initiating control to halt the wheel’s steering operation.

Upon receiving a crab‑steering cut‑off command triggered by the operator, the tandem steel‑wheel roller performs control that returns the wheels to their initial position based on the actual steering angle. According to another aspect of the present invention, a control device for a two‑wheel load roller is provided, comprising a steering‑angle acquisition module configured to obtain the actual steering angle of the wheels during crab‑steering operation. An offset‑control module, in turn, adjusts the crab‑steering offset of the wheels according to the actual steering angle acquired by the steering‑angle acquisition module and the established correspondence between the steering angle and the crab‑steering offset. The controller includes the aforementioned device as well as a steering‑angle detection unit, which measures the actual steering angle of the wheels engaged in crab‑steering with the tandem roller and transmits this measured value to the controller.

On the rear frame and the hinge‑connection shaft, or on the front frame and the hinge‑connection shaft of a tandem steel‑wheel roller, according to another aspect of the present invention, a tandem roller comprising the aforementioned system is provided. By determining the actual steering angle of the wheels in accordance with the vehicle’s driving operation, the present invention controls the magnitude of the wheel’s lateral deviation, enabling control that is independent of the driver’s experience and observation methods, thereby enhancing both the convenience and accuracy of control. When walking with an existing two‑wheeled vehicle, the distance by which the front and rear wheels actually deviate from their intended path can be measured.

The above outlines the control methods for double-drum rollers. For more information, please feel free to contact us at any time!