German H & K brakes, H & K models, H & K prices

H & K brakes, also known as disc brakes, pneumatic brakes, air-operated disc brakes, and air-hydraulic pneumatic brakes, are a type of industrial drive 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.

H & K brake introduction

Pneumatic brakes control the friction between the brake disc and friction plates by adjusting air pressure to achieve the purpose of adjusting paper roll braking force. 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. Generally, 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 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 paper roll braking force. The initial air pressure of the movable friction plate 7 is set according to the paper and printing tension requirements. During paper roll unwinding, if the tension changes, the position of the floating roller (see (c) in the figure) changes, driving the sensor 9 to rotate by an angle and send a feedback signal. This adjusts the air pressure of the movable friction plate 7, changing the friction between the movable friction plate 7 and the brake disc 5, thereby changing the web tension to ensure stable tension. If greater braking force is required, the fixed friction plate 8 can be adjusted to contact the brake disc 5. In the event of paper breakage or emergency stop, the air pressure is urgently increased, causing the friction plates to lock the brake disc 5, preventing paper accumulation due to inertia.

H & K 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 move linearly, thereby pressing the brake block 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 axial 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. Heat generated by friction is dissipated by cooling fins installed on the disc with the hub. The friction plate is split into two halves; 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-applied 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 is applied to engage the brake, forming the braking action.

H & K 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 range. Exceeding the permissible coupling braking work during operation will cause increased heating, redness and heating of the friction surface, and excessive heating may lead to fire. It will also directly affect the performance of the pneumatic brake, so please ensure use within the permissible coupling braking work. 3) Do not exceed the permissible rotational speed by arbitrarily increasing the speed. Using above the permissible rotational 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 rotational 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 or 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) For the assembly position of the brake, try to balance the braking force and driving force on the shaft. 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 chuck, with a deviation of less than 0.2mm being optimal. The amplitude of the brake disc should be controlled within 0.1mm. 10) Before using the air-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, which 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 10mm, it should be replaced immediately to avoid affecting the braking performance of the air-hydraulic pneumatic brake.

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