Vacuum Abrasive Recovery Unit (Negative Pressure Pneumatic Conveying Equipment for Sandblasting Room / Shot Blasting Machine Abrasive Recovery)

This material suction unit (vacuum abrasive recovery unit) is specialized equipment designed to recover scattered abrasive media from sandblasting and shot-blasting operations using the principle of negative-pressure pneumatic conveying. Its core operating principle is as follows: upon startup, the vacuum pump (either a Roots vacuum pump or a single-stage peripheral pump) generates high negative pressure; with the suction nozzle partially submerged in the abrasive material, air entrains the abrasive and draws it through the nozzle into the suction hose. The dust-laden abrasive first enters a gravity-separation tank, where preliminary separation of the abrasive from the air occurs, with the abrasive remaining inside the tank. Air carrying fine dust undergoes secondary separation in a cyclone dust collector and final fine filtration in a cartridge dust collector; the purified air is then exhausted into the atmosphere through a silencer. When the tank is full, a level sensor sends a signal to the electrical control cabinet, automatically stopping the unit; once the abrasive is discharged via an automatic release valve, the unit automatically restarts. This system supports continuous cyclic operation, enabling efficient recovery and automatic recycling of abrasive media.

Regarding manufacturing and structural quality, the unit comprises a separation tank (equipped with abrasive and air suction hoses), a cyclone dust collector, a cartridge dust collector, a vacuum pump, a silencer, and an electrical control cabinet. The machine features a compact, robust structure with a welded structural steel frame; it is equipped with lifting lugs at the top and forklift pockets at the bottom to facilitate hoisting and forklift transport. Core components are of high quality: the vacuum pump utilizes products from renowned international brands such as Japan’s ANLET, the cartridge dust collector employs high-efficiency filtration media, and the electric motor features a high protection rating. The control system is centered on a Programmable Logic Controller (PLC), enabling fully automated program control. The unit is available in two configurations—integrated mobile and split stationary. The integrated type is compact and easy to transport, making it suitable for scenarios requiring frequent relocation, such as specialized marine coating applications or rotating operations across multiple workstations. The split type allows for flexible layout based on the user’s facility installation requirements and is ideal for long-term, continuous operation within a fixed workshop. This abrasive recovery unit is equipped with multiple safety protection features, including motor overload protection, vacuum overload protection, automatic load relief during startup and shutdown, phase loss and phase sequence protection, and low-pressure protection for the compressed air used in back-blowing.

The unit offers outstanding performance advantages and significant application value. First, it boasts high recovery efficiency: utilizing the principle of negative-pressure pneumatic conveying, it rapidly and efficiently recovers scattered abrasive material—achieving recovery rates of 3–12 tons per hour—thereby drastically reducing manual cleanup time. Second, it ensures high cleanliness: a three-stage purification system—combining gravity separation, cyclone separation, and fine filtration via filter cartridges—achieves 99% filtration efficiency for 5μm dust particles, keeping dust emissions at or below 70mg/m³. Third, it is versatile: beyond abrasive recovery in blast rooms, it is suitable for the pneumatic pipeline transport of bulk granular materials, material loading/unloading, and general industrial cleanup. Fourth, it features a high degree of automation: PLC-based program control enables automatic shutdown when full and automatic restart after discharging, allowing for continuous, unattended operation. Fifth, it offers flexible mobility (integrated design): the unit features built-in lifting lugs and forklift pockets, facilitating rapid relocation between different work stations.

In terms of application, this unit is widely used in shipbuilding and repair (recovering abrasive from hull section blasting and specialized coating operations), steel structure engineering (recovering abrasive after rust removal on large components), the foundry industry (recovering abrasive after casting surface cleaning), the petrochemical industry (recovering abrasive from internal and external blasting of storage tanks and pipelines), and bridge construction (recovering abrasive from steel structure blasting), as well as in abrasive circulation systems for various blast rooms and shot-blasting equipment. It serves as the core equipment for efficient abrasive recovery and recycling within these systems.