Jiaozuo brake

1. Inspection of brake

For cranes in normal use, the brakes should be checked every shift. The inspection content includes: the intact condition of key parts of the brake, the contact and separation clearance of the friction pair, the reliability of the brake release, and the overall working performance of the brake. Sensitivity and no jamming phenomenon should be ensured.

During each lifting operation (especially lifting heavy, large, and precision items), the lifting object must be lifted a short distance from the ground, and the reliable performance of the brake must be inspected and confirmed before the operation can be carried out.

The key points of brake safety inspection are:

(1) The braking friction surface of the brake wheel should not have defects or oil stains that hinder braking performance;

(2) The degree of wear of the friction material of the brake band or brake pad;

(3) The actual contact area between the brake band or brake pad and the brake wheel should not be less than 70% of the theoretical contact area;

(4) The brake shall have a Heat capacity that meets the operating frequency and shall not overheat;

(5) The control parts of the brake (such as pedals, control handles, etc.) should have anti slip performance;

(6) Manually control the brake, and the applied force and stroke should not exceed the requirements of Table 6-11. If they exceed the requirements, necessary adjustments should be made. The required operating method is to apply force/N stroke/mm. Generally, it is recommended to use manual control with a value of 100 400 feet, 120 250 feet, and 200 600 feet, 300 300 feet

2. Scrapped brake parts should be scrapped, replaced, or repaired if one of the following situations occurs:

(1) Cracks;

(2) The thickness of the brake band or brake pad friction pad is worn to 50% of the original thickness;

(3) Plastic deformation of the spring;

(4) The wear of the hinge small shaft or shaft hole diameter reaches 5% of the original diameter;

(5) The brake wheel should be scrapped if one of the following conditions occurs:

① Cracks;

② The brake wheel of the lifting and luffing mechanism has a rim thickness wear of 40% of the original thickness;

③ The brake wheels of other institutions have a rim thickness wear of 50% of the original thickness;

④ When the unevenness of the wheel surface reaches 1.5mm, if it can be repaired, the thickness of the wheel flange after repair should meet the requirements of items ② and ③ in this article