A tire shredder is a complex, heavy-duty piece of equipment whose shaft generates high torque. While its sole function is to shred an entire tire into small pieces, its engineering is meticulously planned to ensure operational efficiency and operator safety.
The components of a tire shredder are similar to other shredding equipment, but its design is more robust and durable to meet the demands of tire processing. A basic tire shredder includes a rotor, cutting blades, a housing, a motor, a transmission system, a power supply, and a control system.
Blades: Cutting blades are the most critical component of a shredder, especially a tire shredder, as they are responsible for shredding the tire into small pieces. While various shredders are designed for materials such as paper, plastics, and metals, tire shredders are specifically designed to handle the toughness of tires. To achieve optimal performance, these shredders require high-quality blades capable of efficiently tearing tires.
Dual-shaft tire shredder blades are the most commonly used type and must be installed correctly to ensure effective cutting and long-term durability. Proper installation is crucial for obtaining optimal performance and extending blade life. These blades are spirally mounted with spacer sleeves to keep them separated. This design prevents the blades from colliding during crushing. These blades are typically made of tool steel and are specifically designed to handle the toughness of rubber.
Motor
The motor drives the shredder blades, thus cutting the tire. Tire shredders use electric or hydraulic motors, depending on their size and processing capacity. These motors must be powerful enough to handle the combined strength of fabric, rubber, and metal in tires.
For large-capacity tire shredders, the motor operates at low speed and high torque, allowing it to process up to 40 tons of tires per hour. Some models are equipped with dual motors to improve efficiency and crushing force. Shredder motors have various reduction gear ratios and may be used in single or dual motor configurations. The key is to ensure that the motor can efficiently meet the high-strength requirements of tire crushing while also being durable, reliable, and having a long service life.
Feed Hopper
Tires are loaded into the tire shredder through the feed hopper. Because most tire shredders are designed for high-capacity and high-output operations, the feed hopper configuration must meet these requirements and be connectable to conveyors or hydraulic cylinders for tire control and transport. High capacity demands exceptionally robust and durable feed hoppers.
Control System: The control system manages the tire shredder's operation and monitors its performance. It is typically integrated into automated shredding units, adjusting the feed speed based on the main drive motor and including safety interlocks for protection. PLC (Programmable Logic Controller) systems typically feature power switch control, overload protection, and reverse control, as well as input/output monitoring to ensure smooth and safe operation.
High-performance tire shredder control systems are equipped with advanced control devices such as illuminated buttons, keyless power switches, lockable circuit breakers, and timers. They also include programmable functions, such as blade reversal in case of overload. These systems enhance the ease of operation and safety of the tire shredder, providing excellent crushing process control while maintaining user-friendliness and efficiency.
Rotor: The rotor is a key component of the tire shredder, driving the tire to the cutting zone between the blades. The cutting blades are mounted on the rotor and fixed to a disc. While single-rotor crushers exist, tire shredders are typically equipped with two to four bladed rotors. The rotors operate at 750 revolutions per minute and are protected by guards and end plates, which are further protected by protective caps or hard coatings to ensure durability and efficiency during the crushing process.
Other Functions of Tire Shredders
While standard tire shredders can be installed as complete units, various functions can be added to improve their efficiency and performance. Each manufacturer offers a range of add-ons designed to enhance the crusher's functionality and output. These enhancements help optimize the crushing process and improve overall efficiency.
Cyclotron Screen-Cyclotron screens are used to separate rubber materials. As material moves along the drums of a cyclotron screen, appropriately sized rubber material falls through the screen openings, while improperly sized material returns along the drum to the conveyor belt and is sent back to the crusher. This is a highly efficient screening method and is part of the automation of the crushing process.
Belt Conveyor-Belt conveyors are common equipment in tire shredding processes, and almost all tire shredding systems are equipped with them. Tires are placed on the conveyor and fed along it to the hopper. The belt speed of the conveyor can be adjusted by the control system to adapt to different crushing speeds.
