How to calculate the brake force of the crane

1. According to the load code for building structures (GB 5009), the standard value of crane longitudinal braking force should be 10% of the sum of the maximum wheel pressures of all braking wheels acting on one side of the track.
If only the support between columns is calculated, the axial force (pressure) of roof truss or rigid frame can be arranged at the corresponding position of column top, Then, the horizontal and longitudinal seismic forces are calculated according to the axial force (if calculated by software, the magnitude and calculation method are directly selected).

2. The standard value of wind load is obtained by multiplying the bearing area of the support by the wind pressure, which comes from the gables at both ends of the house (the shape coefficient is taken as the superposition of two sides). When the house has expansion joints, it comes from the gables at one end of the house (the shape coefficient of one side of the pressure area is taken as the shape coefficient). For the single span structure, the total wind load area can be taken as half of the gable cotton area (i.e. 1 / 2 span multiplied by the average height of gable); For multi span structure with inner column bracing, the total wind load area can be approximately taken as the sum of half of the span on both sides of the column row where the column bracing is located multiplied by the height of the column row
the longitudinal braking force of the crane acts on the contact point between the brake wheel and the track, and the standard value should be 10% of the sum of the maximum wheel pressures of all the brake wheels acting on one side of the track (generally, the number of brake wheels of each crane is half of the number of wheels on one side of the crane). The number of cranes should not be more than two, and the rection factor should be paid attention to
or watch http://wenku..com/view/8aa8a405cc17552707220852.html
the explanation is very detailed.

3. It's not calculated. Even if calculated, it can not be used as the design basis
crane instructions are available. If not, please provide it in writing
if not, please provide it
or, according to similar procts, but inform the owner.

4. The self weight multiplied by the maximum moving speed, the maximum static friction force and the reaction force are about the same

5. The longitudinal braking force of the crane is 10% of the sum of the maximum wheel pressures of all braking wheels on one side of the crane.

6. The ground braking force is the axle load multiplied by the adhesion coefficient. The calculation of brake force is much more troublesome

7. The load transfer of the structure is from top to bottom roof load - roof panel - roof purlin - roof beam - through the upper column support - structural column (crane load) - lower column support - foundation

8. The distance from the brake surface to the axle center of the brake disc multiplied by the braking friction force
because the braking effect provided by the brake is ultimately in the form of torque, it is the braking torque (the size is related to the pressure)

9.

Suppose that the same object is hoisted with different angles, that is, the distance from the object to be hoisted is different а， The weight of the goods is g, the allowable overturning force of the crane is f, and the relationship is: g = sin а* F. Because the sine value increases with the increase of the angle, G does not change

crane or trolley speed squared / crane mass = minimum braking distance of crane or trolley. The maximum braking distance of the cart is = cart speed / 15. If it is calculated, the maximum braking distance of the cart is = cart speed / 20

extended data:

precautions:

1. Before the operation of the crane, the crane should be maintained, checked and prepared according to the operation and maintenance instructions, then the engine should be started, various instruments should be checked in the neutral position, and whether there are overhead power lines or obstacles in the operation range. After confirmation, the operation preparation can be carried out

2. No load operation: start each mechanism of the truck crane for no-load operation, operate each control system (or control device), check whether the operation and action of the mechanism are normal, whether the brake of the lifting mechanism is safe and reliable, and adjust if necessary. For the hydraulic truck crane, it is necessary to connect the oil pump with the power output shaft and preheat the hydraulic oil at idle speed to make the oil temperature meet the specified requirements and ensure the smooth flow of the hydraulic system

10. Introction to automobile braking force
in the automobile instry, we often hear such a word, automobile braking force, but people don't know much about automobile braking force. Let's analyze what is automobile braking force

introction of automobile braking force 1: explanation

introction of automobile braking force 1: explanation

automobile braking is braking, and braking force is the maximum rolling friction that can be achieved, because when rolling changes to sliding, the friction will drop suddenly, that is, the maximum rolling friction is greater than sliding friction, which is why automobile has anti lock system

braking performance is one of the main performances of automobile, which is related to driving safety. The most basic indexes to evaluate the braking performance of a car are the braking acceleration, braking distance, braking time and the stability of braking direction

introction of automobile braking force 2: source

introction of automobile braking force 2: source

the braking force of a car depends on the friction of the brake, but the braking force that can make the car brake slow down, It is also restricted by the ground adhesion coefficient

introction of automobile braking force 3: calculation formula

introction of automobile braking force 3: calculation formula

when the braking force generated by the brake increases to a certain value, the automobile tire will slip on the ground. Its slip ratio δ＝ ( V t -V a )/V t × 100% where: δ-- Slip ratio; Vt -- theoretical speed of vehicle; V a -- the actual speed of the car

according to the test, when the wheel slip rate is high, the wheel slip rate is low δ＝ Therefore, in order to obtain the best braking effect, the slip ratio must be controlled in the range of 15% - 20%

the ratio of total braking force to vehicle weight is more than 60% under no load and more than 50% under full load; The ratio of the braking force of the main bearing shaft to the axle load is more than 60% under no load and more than 50% under full load. Generally, the braking force of the car is about 3000n

it turns out that automobile braking force plays such an important role, so when you buy a car, you must pay attention to whether the function of automobile braking force is excessive