Jiaozuo brake

What are the differences between drum brake and disc brake

The brake is a device with the functions of decelerating, stopping or maintaining the stop state of moving parts (or moving machinery). It is a mechanical part that stops or decelerates the moving parts in the machine. Commonly known as brake, brake. The brake is mainly composed of brake frame, brake parts and control devices. Some brakes are also equipped with automatic brake clearance adjustment device. In order to reduce the braking torque and structural size, the brake is usually installed on the high-speed shaft of the equipment, but the large equipment with high safety requirements (such as mine hoist, elevator, etc.) should be installed on the low-speed shaft close to the working part of the equipment.

Advantages and disadvantages of electro-hydraulic drum brake:

The advantages and disadvantages of the above drum brakes can be analyzed and compared as follows.

(1) First of all, in terms of braking efficiency, under the condition that the structural parameters are basically the same, the automatic booster brake is fully utilized due to the increasing effect of friction force, and the braking efficiency is high, followed by the balanced brake, and the unbalanced brake is low. On the other hand, the friction coefficient between the brake shoe and the brake drum is itself an unstable factor, It varies in a wide range with the material properties, temperature and surface conditions of the brake drum and friction pad (such as whether they are contaminated with water, oil, etc.).The braking efficiency of the automatic booster brake is sensitive to the friction coefficient, so it is very unstable.

(2) Drum brakes make use of friction potentiation to ensure certain braking efficiency to varying degrees. However, in use, the stability of braking efficiency is poor because the friction coefficient is not stable.

(3) When the brake works, most of the heat generated by friction is transferred to the brake drum to raise its temperature. In order to reduce the temperature rise, the brake drum should have a large heat capacity. Ywz9 (ywz5) series electric hydraulic brake

Drum brake:

(1) Simple unbalanced brake: This is a common hydraulic wheel brake. In this kind of brake, the auxiliary potential shoe, by the action of friction force, causes the pressure on the brake drum to be much greater than the reducing potential shoe. In order to make the two shoes wear evenly, make the auxiliary potential shoe longer than the reducing potential shoe, so that the opening force acting on the shoe is different, but the friction torque is equal, so as to achieve the purpose of uniform wear.

(2) Balanced brake: the balanced brake has two types: one-way potential assistance and two-way potential assistance. The one-way potential assistance balanced brake has the function of automatic potential assistance when each shoe is hard pressed against the brake drum, but when reversing, it will become a reduced potential shoe, with poor braking effect. Because of its large one-way braking torque, it is called one-way balanced brake. The front and rear brake wheel cylinders of the two-way balanced brake drive the two floating brake shoes. When braking forward, all the wheel cylinder pistons move outward under the action of hydraulic pressure, pressing the two shoe pads against the brake drum. Under the action of the friction torque of the brake drum, both shoes rotate in the direction of wheel rotation until the support at the outer end of the piston of the two wheel cylinders is pushed back to the end face of the wheel cylinder. This brake has good contact and uniform wear, The braking efficiency is high, which is mostly used by modern vehicles.

(3) Automatic booster brake: this structure bl130 uses this kind of brake shoe. The lower ends of the left and right shoes are connected by floating adjusting rods. When the upper end of the left shoe is pressed by the slave pump to the brake drum, the opening force of the slave pump is transmitted to the lower end of the right shoe through the potential assistance of the shoe. This thrust is greater than the opening force of the slave pump. The braking torque of the right shoe with the same potential assistance is greater than that of the left shoe, The braking efficiency of the whole brake is higher than that of the balanced brake, and it has a device that automatically adjusts the shoe clearance.

Widely used in lifting, metallurgy, mines, ports The main products in construction and other machinery are: electric hydraulic block brake series ywzb ywz3b ywz4b ywz5 ywz8 ywz9 ywz12 ywz13 YW YWL tywz2 YWP electromagnetic block brake JZ (tj2a) MW (z) zwza zwz2 zwz3a dcw3 electromagnetic fail safe disc brake 5SE 561se 56se dcpz12.7 4se 3Se st1se st2se 450SE hydraulic fail safe disc brake 5sh 4sh 3SH 450sh st1sh st3sh st4sh sb(yqp) Sbdst5sh st10sh st16sh st25sh st25sh-a st40sh 904sh SBB electric hydraulic arm disc brake ypz2 Ⅰ, Ⅱ, Ⅲ ypz2 Ⅳ, Ⅴ, Ⅵ pneumatic caliper disc brake qp12.7 5SP 4SP 3sp 450sp PD adp60m-adp61m-adp62m hydraulic direct acting disc brake dadh75 adh60 adh90 adh120 dadh80 dadh90 dadh103 dadh195 electric hydraulic thruster YT1 ed explosion proof electric hydraulic thruster byt1 bed

There are many types of brakes, such as drum brakes, disc brakes, etc., depending on the place of use. What are the differences between the two braking modes?

1. Drum brake is to install two semi-circular brake pads in the wheel hub, and use the "lever principle" to make the brake pads contact with the inner surface of the wheel drum to generate friction and brake. The disc brake uses the brake caliper to control the two brake pads to clamp the brake discs on the wheels. When the brake pads clamp the disc, friction will occur between them.

2. The brake system of drum brake can use low oil pressure. The diameter of drum brake will increase after heating, and the brake response will not be as expected. The heat dissipation of the disc brake is better than that of the drum brake, and the brake failure will not be caused by brake recession when the brake is continuously applied. The braking force of the left and right wheels of the disc brake is relatively average, and the brake disc has good drainage, which can reduce the phenomenon of poor braking caused by water or sediment.

3. The hand brake mechanism of drum brake is easy to install. Some rear wheels are equipped with disc brakes, and the drum hand brake is installed in the center of the brake disc. The pedal force of the brake is not easy to control, which is not conducive to the emergency braking action. The friction area between the disc brake pad and the brake disc is smaller than that of the drum brake, so the braking force is weak. In order to improve the shortcomings of the braking force, it is necessary to increase the pedal force or increase the oil pressure to improve the braking force.

4. Drum brake parts processing is relatively simple, low manufacturing cost, but more structural parts. Disc brakes are simple in structure and easier to maintain, but the brake pads are worn out and replaced frequently.