Jiaozuo brake

Electric hydraulic drum brake using mechanism for braking

Brakes are mainly used for deceleration and parking braking of various machinery. Brakes are almost an indispensable and important component in various operating mechanisms of cranes. In response to their importance, this article describes the structural characteristics and application situation of crane brakes.

Regularly check the working condition of the brakes.

During the inspection, the following items should be emphasized:

Check whether the components of the brake can move normally and whether the adjusting nuts are fastened.

Whether the components of the thruster are normal and whether the hydraulic oil is sufficient. Is there any oil leakage or seepage. Check if the insulation of the incoming wires is good.

The size H1 should not be less than the small dimensions listed in Table 1. If it exceeds the requirements, it must be adjusted immediately, otherwise the braking effect will be lost.

Check whether the brake shoe rests on the brake wheel normally, whether the friction surface is in good condition, and whether there is greasy dirt. When the thickness of the brake pad reaches the values in Table 2, the brake pad should be replaced.

1、 Quality standard: original factory standard, with a one-year shelf life, and consumables are not within the shelf life;

2、 Delivery time: days;

3、 Delivery location: Your company's location;

4、 Transportation method: highway logistics or express delivery;

5、 Transportation costs: borne by the seller;

6、 Validity period of quotation: 30 days

According to your needs, choose temperature resistance, wear resistance, select materials, provide drawings, or provide technical requirements to design friction coefficients according to production requirements.

Electric hydraulic brakes (hereinafter referred to as brakes) are mainly used for braking various mechanisms in lifting, transportation, ports, construction and other machinery. The installation dimensions and braking torque parameters of the products comply with the JBZQ4388-86 standard, the technical requirements comply with the JB6406-92 standard, and the working conditions of the brakes comply with the relevant provisions of this sample.

2. Usage conditions:

2.1 Environmental temperature: -25 ℃ -+45 ℃ (refer to the user manual of the thruster):

2.2 There should be no flammable, explosive or corrosive gases in the surrounding working environment, and the relative temperature of the air should not exceed 90;

2.3 Please refer to the nameplate of the thruster for the power supply voltage;

2.4 The altitude of the location of use shall comply with GB755-2000.

3. Structure and working principle: Z4-121 standard image

Advantages and disadvantages of electric hydraulic drum brakes:

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

(1) Firstly, in terms of braking efficiency, under the condition of basically the same structural parameters, the automatic booster brake is fully utilized due to its increasing effect on friction force, followed by the balanced brake with high braking efficiency and the non balanced brake with low braking efficiency. However, on the other hand, due to the unstable friction coefficient between the brake shoe and brake drum itself, It varies greatly depending on 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 an automatic booster brake is sensitive to the friction coefficient and is therefore very unstable.

(2) Drum brakes utilize friction to varying degrees to ensure certain braking efficiency, but in use, the stability of braking efficiency is poor due to the unstable friction coefficient.

(3) When the brake is working, 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.

Drum brake:

(1) Simple Unbalanced Brake: This is a common type of hydraulic wheel brake. In this type of brake, the auxiliary shoes rely on frictional force, resulting in much greater pressure on the brake drum than the reducing shoes. To ensure uniform wear of the two shoes, the auxiliary shoes are made longer than the reducing shoes, so that the opening force acting on the shoes is equal, but the frictional torque generated is equal, thus achieving uniform wear.

(2) Balanced brake: Balanced brake has two types: unidirectional and bidirectional assistance. The unidirectional assistance balanced brake has an automatic assistance effect when each shoe is hard pressed against the brake drum, but it will become a reducing shoe when reversing, resulting in poor braking effect. Due to its large unidirectional braking torque, it is called a unidirectional balanced brake. The two front and rear brake cylinders of the two-way balance brake drive the two floating brake shoes. When braking forward, all the piston of the cylinder moves outward under the hydraulic pressure to press the two shoes against the brake drum. Under 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 cylinder is pushed back to the end face of the cylinder. This brake has good contact and uniform wear, The braking efficiency is high, and most of them are used by Hyundai Motor Company.

(3) Automatic booster brake: This structure BL130 uses a floating adjustment rod to connect the lower ends of the left and right brake shoes. When the upper end of the left brake shoe is pressed towards the brake drum by the wheel cylinder, the opening force of the wheel cylinder is transmitted to the lower end of the right brake shoe through the potential effect of the shoe, which is greater than the opening force of the wheel cylinder. The right brake shoe, which also has the potential effect, produces a greater braking torque under the greater thrust effect than the left brake shoe, The braking efficiency of the entire brake is higher than that of the balanced type, and it has a device for automatically adjusting the shoe clearance.

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