German KEB brakes, KEB models, KEB prices

KEB brakes are the actuating components in the entire braking system. The electromagnetic brake is installed on the trailer wheels. Its structure is shown in Figure 1. The entire brake mainly consists of components such as the electromagnet, lever drive mechanism, front and rear brake shoes, base plate, and friction ring. It is a mechanical part that stops or decelerates moving parts in machinery. Commonly known as brakes. Brakes mainly consist of a brake frame, braking elements, and operating devices. Some brakes are also equipped with automatic adjustment devices for the clearance of the braking elements. To reduce braking torque and structural dimensions, brakes are usually installed on the high-speed shaft of the equipment, but for large equipment with high safety requirements (such as mine hoists, elevators, etc.), they should be installed on the low-speed shaft close to the working part of the equipment.

KEB Brake Introduction

Pneumatic brakes control the friction between the brake disc and the friction plates by adjusting the air pressure, thereby achieving the purpose of adjusting 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) in the figure. The structure of the pneumatic brake is shown in (b) in 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 circumstances, there is a gap of 1 to 2mm between the fixed friction plates 8 and the brake disc 5 (the gap is adjustable). The movable friction plates 7 are 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 plates 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 of the movable friction plates 7 is set according to the paper and printing tension requirements. During the unwinding of the paper roll, 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 plates 7, changing the friction between the movable friction plates 7 and the brake disc 5, thereby changing the web tension to ensure stable tension. If greater braking force is required, the fixed friction plates 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 the paper roll from bunching due to inertia.

KEB Brake Working Principle

The working principle of a pneumatic brake involves inputting pressurized gas into the air bag of the pneumatic brake, which pushes the piston to perform linear motion, thereby pressing the brake friction blocks against the brake wheel to generate friction and achieve braking. Pneumatic brakes are engaged by air pressure and released by 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 conical shaft sleeve with a wedge, featuring a structure that allows 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 with double cuts; 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 properties and are widely used in packaging machinery, wire and cable equipment, thin paper, and corrugated paper industries. Pneumatic brakes are also known as air brakes, meaning that an air bag applies pressure through ventilation to tightly close the jaws to achieve braking. This type is widely used in industry. Pneumatic brakes are further divided into normally closed brakes and normally open brakes. A normally closed brake has its jaws always open when not working; when working, air is supplied to engage the brake, forming the braking action.

KEB Brake Application Notes

Used in metallurgy, construction, chemical, food, machine tools, stage, elevator, ship, packaging, and other machinery, as well as in situations requiring braking during power failure (safety). Brakes that utilize electromagnetic effects for braking are divided into electromagnetic powder brakes, electromagnetic eddy current brakes, and electromagnetic friction brakes, among other forms. 1) Electromagnetic Powder Brake: When the excitation coil is energized, a magnetic field is formed. The magnetic powder is magnetized under the influence of the magnetic field, forming magnetic powder chains, and aggregates between the fixed magnetic conductor and the rotor. Braking is achieved through the bonding force and friction of the magnetic powder. When the excitation current disappears, the magnetic powder returns to a free and loose state, and the braking action is released. This type of brake is small in size, light in weight, and has low excitation power. Moreover, the braking torque is independent of the rotational speed of the rotating parts, but the magnetic powder can cause wear on components. It is convenient for automatic control and suitable for various machine drive systems. 2) Electromagnetic Eddy Current Brake: When the excitation coil is energized, a magnetic field is formed. The armature on the brake shaft rotates, cutting magnetic lines of force to generate eddy currents. The interaction between the eddy currents in the armature and the magnetic field forms the braking torque. Electromagnetic eddy current brakes are robust, durable, easy to maintain, and have a wide speed regulation range; however, efficiency is low and temperature rises at low speeds, so heat dissipation measures must be taken. This type of brake is commonly used in machinery with vertical loads. 3) Electromagnetic Friction Brake: When the excitation coil is energized, a magnetic field is generated, attracting the armature through the magnetic yoke. The armature achieves braking on the shaft through the connection flange. It is further subdivided into electromagnetic dry single-disc brakes, dry multi-disc brakes, wet multi-disc brakes, etc. Braking methods can also be divided into power-on braking and power-off braking.

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