German Bubenzer brakes, Bubenzer models, Bubenzer prices

Bubenzer 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, impact, and knocking, with a long service life. Generally, only the brake pads need to be replaced, which is easy and convenient. They utilize magnetic effects.

Bubenzer Brake Introduction

Pneumatic brakes control the friction between the brake disc and friction plates by adjusting air pressure to achieve the desired 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 plates 8 and the brake disc 5 (the gap is adjustable). The movable friction plates 7 are mounted 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 an air hole 1. The friction force 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 on the paper roll. The initial air pressure for the movable friction plates 7 is set according to paper and printing tension requirements. As the paper roll unwinds and tension changes, the position of the floating roller (see (c) in the figure) changes, causing the sensor 9 to rotate by an angle and send a feedback signal. This adjusts the air pressure on the movable friction plates 7, changing the friction force between the movable friction plates 7 and the brake disc 5, thereby altering the web tension to ensure stability. 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 rapidly increased, causing the friction plates to lock the brake disc 5, preventing the paper roll from bunching due to inertia.

Bubenzer Brake Working Principle

The working principle of a pneumatic brake involves introducing pressurized gas into the air bag of the pneumatic brake, which pushes the piston in a linear motion. This presses the brake 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 axis 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, 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 split 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 called air-applied brakes, meaning an air bag applies pressure via ventilation to close the jaws tightly for braking effect; this is widely used in industry. Pneumatic brakes are further divided into normally closed and normally open brakes. A normally closed brake has its jaws open when not working; when air is applied during operation, it engages the brake, creating the braking action.

Bubenzer Brake Application Notes

Used in metallurgy, construction, chemical, food, machine tools, stage, elevator, ship, packaging, and other machinery, as well as for braking during power outages (safety). Brakes that use electromagnetic effects for braking include electromagnetic powder brakes, electromagnetic eddy current brakes, and electromagnetic friction brakes. 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, loose state, and the braking action is released. This type of brake is small in size, light in weight, and has low excitation power. The braking torque is independent of the rotational speed of the rotating parts, but the magnetic powder can cause wear on components. It is suitable for automatic control and applicable to 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 flux lines and generating 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 at low speeds, and temperature rises, so cooling 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. The magnetic yoke attracts the armature, and 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 classified into power-on braking and power-off braking.

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