Analysis of Core Structure and Technology of Synchronous Belt Precision Circulation System for Circular Rail Conveyor Line

The synchronous belt precision circulation system of the annular guide rail conveyor line can realize the functions of high-precision circulation positioning and fast positioning through the coordinated operation of each functional module. The following takes the annular guide rail conveyor line of the synchronous belt drive as an example to illustrate its core structure:

Annular guide system

Based on the requirements of the application scenario, the mainstream configuration solutions include elliptical annular guides and rectangular annular guides.

1. Elliptical annular guide rail: composed of two 180 ° arc guide rails and two linear guide rails spliced end to end;

2. Rectangular annular guide: It is formed by the combination of four 90 ° arc guides and four linear guides.

Special custom solutions support regular polygonal, circular, and other special-shaped structural designs, but such non-standard configurations are used less frequently.

Slide unit

According to the requirements of the number of process stations, the sliding seat assembly of the corresponding specification is configured. The standard sliding seat bearing plate is precisely machined, the standard size series is preset, and the pre-drilling system (including threaded holes and positioning holes) is integrated, which is convenient for the quick installation of jigs, fixtures and other process equipment.

Support non-standard customization services: After the user provides detailed dimensional parameters and assembly technical requirements, the special project processing and assembly services of the sliding seat plate can be provided.

III. Synchronous transmission system

Adopt polyurethane timing belt with built-in high-strength wire rope reinforcement structure. The timing belt is set with standard punching positions, and the sliding seat is connected by fixing the belt buckle with screws. The system connects multiple groups of sliding seats in series through the timing belt to ensure the synchronicity of movement.

The transmission scheme has the remarkable characteristics of high-speed operation, low noise and high positioning accuracy.

IV. Flexible connecting device

In view of the centripetal migration characteristics (approaching the center of the circle displacement) caused by the sliding seat passing through the arc guide rail section, an elastic connection structure is adopted between the sliding seat and the synchronous belt:

• The connecting mechanism consists of two components: the belt buckle is fixed to the timing belt, and the other component is installed on the side of the sliding seat;

• Design the movable gap between the two components to compensate for the radial displacement of the arc section.

Five, precision positioning locking mechanism

In order to achieve the repeated positioning accuracy of ± 0.05mm, the positioning side of the sliding seat is equipped with a high-precision positioning module. After the sliding seat is in place, the cylinder-driven swing arm pressure rod is embedded in the positioning block slot to complete the precise locking.

Optional positioning solutions include: cylinder slide/swing arm type mechanical positioning, servo motor electronic control positioning locking device.

Six, timing belt drive wheel assembly

As the active driving unit of the circulation system, the synchronous pulley designs an annular avoidance groove for the belt buckle fixing screw to ensure the smooth passage of the screw head.

The gear profile of the transmission adopts a matching design: the synchronous belt teeth are precisely meshed with the gear grooves of the driving wheel, which effectively improves the load-bearing capacity and inhibits the transmission skid phenomenon under low-speed and heavy-load conditions.

Seven, driven wheel assembly

As a passive transmission unit (also known as idler), the driven wheel cooperates with the drive wheel to form a transmission pair. The driven wheel moves with the timing belt, and its tooth structure precisely matches the teeth of the synchronous belt to ensure the transmission stability.

Eight, drive shaft system

The drive shaft is used as a power transmission hub, the upper part is installed with a synchronous belt drive wheel, and the lower part is connected with a drive motor. The component realizes the precise transmission of motor power to the synchronous belt drive.

Nine, driven shaft system

The driven shaft supports the driven wheel assembly to ensure the stable operation of the driven wheel. The drive shaft and the driven shaft share the function of pulley positioning, and improve the operation stability of the system through structural optimization.

X. Support frame system

The linear guide section is fixed and installed on the aluminum profile frame structure through the combination of T-shaped guide bar and locking screw. The design ensures the positioning accuracy and structural rigidity of the linear guide rail.

Eleventh, arc guide rail installation base

The curved transition section is equipped with a special mounting substrate (including driver/follower wheel mounting interface), made of aluminum alloy or stainless steel, and the surface is precisely machined and prefabricated with high-precision mounting holes. The two ends of the substrate are supported on the aluminum profile frame to realize the connection and integration of the arc guide rail and the linear guide rail.

• Structure composition: layered design (including top arc positioning orifice plate and bottom fixed substrate);

• Composite function: In addition to the guide rail connection, it also serves as the installation reference platform for the drive shaft/driven shaft, and realizes precise control of the timing belt tension force by adjusting the relative position of the two axes.