German Corbetta brake Corbetta model Corbetta price

Corbetta brakes, also known as disc brakes, pneumatic brakes, air-operated disc brakes, and air-hydraulic pneumatic brakes, are a type of industrial transmission brake. They are actuators that use air pressure to stop or decelerate moving parts in machinery. The structure is simple, installation is convenient, and they are durable, resistant to pressure, drops, and impacts, with a long service life. Generally, only the brake pads need to be replaced, which is easy and convenient, utilizing magnetic effect.

Corbetta brake introduction

Pneumatic brakes control the friction between the brake disc and friction plates based on air pressure to adjust the braking force on the paper roll. The installation, structure, and tension control principle of the pneumatic brake are shown in the figure. The installation position of the pneumatic brake and the paper roll mandrel is shown in (a) of the figure. The structure of the pneumatic brake is shown in (b) of the figure. The brake disc 5 is connected to the paper roll shaft. Fixed friction plates 8 and movable friction plates 7 are installed on both sides of the brake disc 5. Under normal conditions, there is a gap of 1 to 2mm between the fixed friction plate 8 and the brake disc 5 (the gap is adjustable). The movable friction plate 7 is installed on the piston shaft 4 of the cylinder. The compressed air interface 2 on the left side of the piston is connected to the air compressor, and the right side of the piston is connected to the atmosphere through the air hole 1. The friction force between the movable friction plate 7 and the brake disc 5 is controlled by the air pressure on the left side of the piston, thereby controlling the braking force of the paper roll. The initial air pressure for the movable friction plate 7 is set according to paper and printing tension requirements. As the paper roll unwinds, tension changes cause the position of the floating roller (see (c) in the figure) to change, rotating the sensor 9 by an angle and sending a feedback signal. This adjusts the air pressure on the movable friction plate 7, changing the friction force between the movable friction plate 7 and the brake disc 5, thereby altering the web tension to ensure stability. If greater braking force is required, the fixed friction plate 8 can be adjusted to contact the brake disc 5. In case of paper breakage or emergency stop, the air pressure is rapidly increased, causing the friction plates to lock the brake disc 5, preventing the paper roll from bunching due to inertia.

Corbetta brake working principle

The working principle of a pneumatic brake involves inputting pressurized gas into the air bag of the pneumatic brake, pushing the piston to perform linear motion, thereby pressing the brake friction blocks against the brake wheel to generate friction and achieve braking. Pneumatic brakes engage via air pressure and release via return springs; the disc slides along the shaft direction under air pressure to contact the friction plate. The disc, friction plate, etc., are assembled onto the hub to form an integrated structure. The friction plate can be disassembled by unscrewing the adjustment nut, making replacement simple. Pneumatic brakes are installed on the shaft using a tapered bushing with a wedge, allowing the friction plate to be replaced while keeping the mechanical equipment intact. Cooling fins installed on the disc with the hub dissipate heat generated by friction. The friction plate is a double-slotted split type; it can be replaced by removing the countersunk screws through the holes in the disc with the hub using a screwdriver. Pneumatic brakes have good heat dissipation and are widely used in packaging machinery, wire and cable equipment, thin paper, and corrugated paper industries. Pneumatic brakes are also called air brakes, meaning an air bag applies pressure through ventilation to close the jaws tightly for braking; this is widely used in industry. Pneumatic brakes are divided into normally closed and normally open types. A normally closed brake has its jaws open when not working; when working, air pressure is applied to engage the brake, creating braking action.

Corbetta brake precautions for use

1) Install a safety cover with good ventilation or other safety measures. 2) The pneumatic brake must be used within the permissible coupling and braking work load range. Exceeding the permissible coupling and braking work load during operation will cause increased heating, redness and overheating of the friction surface, which may lead to fire. It will also directly affect the performance of the pneumatic brake, so please ensure use within the permissible coupling and braking work load. 3) Do not arbitrarily increase the rotation speed beyond the permissible limit. Exceeding the permissible rotation speed will increase vibration and, depending on the situation, may lead to dangerous conditions such as damage or flying debris. Please ensure use below the permissible rotation speed and install a protective cover. 4) The friction plates used must not come into contact with water or oils, as this will affect torque and operating performance. 5) Before installing the pneumatic brake, confirm the surrounding environment. Places with moisture, oil, dust, vibration, impact, or high humidity will directly affect the service life and performance of the pneumatic brake. 6) When assembling the brake, position it so that the braking force and driving force are balanced on the shaft as much as possible. 7) The air port of the air-hydraulic pneumatic brake should be located above the brake body to facilitate air exhaust. 8) The position of the booster and hydraulic source should be higher than the brake, and the closer to the brake, the better. 9) The brake disc should be installed at the center of the brake caliper; a deviation of less than 0.2mm is preferable, and the amplitude of the brake disc should be controlled within 0.1mm. 10) Before using the air-operated pneumatic brake, completely exhaust the air from the brake body, loosen the exhaust port bolt, and attach a transparent hose. Note: Operate the hydraulic source with low pressure until the brake fluid fills the hydraulic cylinder (avoid rapid entry of brake fluid into the hydraulic cylinder, as this may create foam and hinder air exhaust) and flows into the transparent hose. Ensure there are no air bubbles in the hose before tightening the exhaust bolt and removing the transparent hose. Maintain sufficient brake fluid volume at all times, do not mix with other mineral oils, and replace regularly. When the brake lining wears down to a thickness of only 10mm, it should be replaced immediately to avoid affecting the braking performance of the air-hydraulic pneumatic brake.

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