What is forklift's braking system?
Fork lifter brake system: Two sets of brake systems are generally installed: one set is the service brake system, which is often used to reduce speed or stop during driving. This is the brake system usually called. The other is the parking brake system, which is auxiliary and used to keep the forklift stationary after the forklift stops.
Common service brakes:
Method: Human hydraulic brake
Structure: foot brake mechanism, brake master cylinder, brake cylinder, brake assembly and brake oil pipe
Principle: When the brake pedal is depressed, the torque is transmitted to the brake master cylinder through the mechanism, and the brake master pump converts the mechanical energy into the pressure energy of the brake oil. Open the hydraulic clutch of the gearbox. One way the brake oil is directly transmitted to the brake cylinders inside the brakes on both sides of the drive axle. The pistons in the brake cylinders press the brake shoes against the brake hub to produce a braking effect. When the brake pedal is released , The return spring acts, so that the pistons in the brake cylinder and clutch cylinder return to their original positions, which has a relief effect. At this time, the brake fluid originally pressed by the master cylinder piston flows back to the master cylinder through the brake oil pipe, the brake shoes are disengaged and returned to the original position, and the braking effect disappears.
Common service brakes:
Method: pneumatic power braking
Structure: Air compressor, oil-water separator, brake control valve, pressure control valve, brake air pipe assembly, air tank assembly, brake
Principle: The engine drives the air compressor through the belt (gear) drive to press the air into the air storage tank. The air storage tank is connected through the brake control valve and the brake air chamber. When the brake pedal is depressed, the compression in the air storage tank The air enters the brake air chamber through the control valve, and the push rod of the brake air chamber protrudes outward under the action of the air pressure, and the brake cam is rotated to cause the brake shoes to spread and press against the brake hub to produce a brake effect. When the brake pedal is released, the control valve closes the air passage from the air reservoir. At the same time, the air in the brake air chamber is discharged from the exhaust valve to the atmosphere, the brake shoe is pulled back to the original position by the action of the return spring, and the braking effect disappears.
Method: mechanical drive mechanism
Function: to ensure the long-term braking purpose, or emergency braking when the foot brake fails
Structure: Brake control mechanism, flexible shaft, hand brake assembly, limit mechanism, return spring and related couplings
Principle: Pull up the brake handle and change the angle of the rocker arm of the brake through the flexible shaft transmission. Under the action of the mechanical mechanism, the brake shoe of the brake is opened to produce braking. At this time, the brake handle is in the limit device Under the action, it is in a pulled-up state to achieve a long-term braking effect. After releasing the brake handle, the brake shoe returns to its original position under the action of the return spring, and the braking effect disappears.