How to calculate the lift force

1. How do you want to ask, questions with questions

2. Because the parameters are not provided, it can not be checked for you, so it is calculated in this way without considering its strength and stability The efficiency of worm pair is about 0.66, and that of lead screw pair is about 0.58 (grease mixing and bearing loss are included). Total efficiency = 0.66 * 0.58 = 0.38
rated output torque of motor = 9550 * 0.12/2800 = 0.41n * m, according to power conservation, t = f * s / 2000 / 3.14 / efficiency / acceleration ratio = 0.41
F = 3.057kn in push rod system
the electric push rod is a kind of electric actuator. Its working principle is that the motor rotates, the worm or gear changes to linear motion, and the push-pull back and forth is used to complete the reciprocating action of a certain equipment. In recent years, this kind of equipment is widely used in a variety of simple and complex mechanical equipment manufacturing. The main components of the electric push rod are: motor, rection gear (worm) and lead screw. Optional parts: travel switch, potentiometer, mounting bracket, etc. The form of electric push rod is divided into ordinary T-shaped teeth and ball screw. The ordinary T-shaped teeth are suitable for the situation where the working frequency is not too high, and the electric push rod can work about 10 times per hour, which can fully meet the requirements. The T-shaped tooth electric push rod can realize the function of complete self-locking, so as to ensure the absolute safety of the application. The ball screw push rod can work continuously to meet the requirements of high frequency applications. The stroke switch of the electric push rod is used to control the stroke of the push rod. When the stroke reaches the set value, the motor will power off automatically, and the potentiometer is used to display the stroke value of the push rod, which can achieve the purpose of automatic control and adjustment of the push rod at any time. Electric push rod elevator system load up to 250 kn, to solve the problem of high load-bearing push-pull lifting device. And can achieve a drag one, a drag two, a drag four synchronous function
electric push rod grade: according to the rated thrust, it can be divided into 12 grades: 25, 100, 300, 500, 700, 1000, 1600, 3200, 5000, 10000, 20000, 30000 kg. According to the stroke, it is 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300 mm. Each stroke of the electric push rod has two speeds: 42 or 84, 50 or 100, 26.6 or 53.2
the electric push rod is easy to install, and the installation method can be processed according to the customer's requirements. The characteristics of electric push rod are small volume, easy installation, environmental protection, no pollution, stable operation, large load, high precision and synchronous automation control. These proct characteristics make it widely used in mechanical equipment processing and manufacturing instry. In recent years, it has been widely used in metallurgy, military instry, aerospace, solar energy, instrial automation, etc

3. If the layout of the oil cylinder is different, the pressure will be different. It is related to the mechanical structure of the whole mechanism. What you said is too general.

4. Thrust, f = P * at
P = pressure
at = total piston area

5.

(1) according to the moment of inertia formula of rectangular thin plate, the moment of inertia of the whole table when the turntable rotates around the central axis is:

J = 400 ×( one point six × 1.6+0.9 × 0.9/12=112.3Kgm2

(2) suppose the rotating speed of the turntable is 9 °/ s. When the acceleration time is 2S, the angular acceleration is 0 α= four point five °/ S2, expressed in radians as α= 4.5/57.3(rad/s2)=0.079(rad/s2)

(3) from (1) and (2), the acceleration torque of the turntable is m = J α= one hundred and twelve point three × 079 = 8.8nm (if the acceleration increases, the required torque will increase)

(4) estimate the friction torque MF of the whole turntable system (related to your whole turntable equipment: such as the friction of slewing support or bearing, etc.), and add the friction torque MF to the acceleration torque M to make the turntable rotate without the required torque (of course, if you choose the motor, you need the torque)

6.

The calculation formula of current of single-phase motor (U * cossfi)

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1.2A 3000V: 4kw / 1A

motor power calculation formula: (common three-phase motor power calculation)

P1 = 1.732 * u * I * cos φ

where P1 (W) is the three-phase motor power, u (V) is the line voltage, I (a) is the line current, cos φ The power factor is usually taken as 0.8

triangle connection, and the calculation formula is: P2 = 3 * P1

that is, three times of the power of three-phase power Y connection

=0.714

7. Fixed lifting platform: fixed hydraulic lifting platform is a kind of goods lifting equipment with good lifting stability and wide application range, which is mainly used for goods transportation between the height difference of proction line; Material online and offline; Adjust the height of workpiece when assembling; High feeder feeding; Lifting of components ring assembly of large equipment; Loading and unloading of large machine tools; Warehouse loading and unloading places are equipped with forklift and other transport vehicles for rapid loading and unloading of goods. According to the use requirements, the fixed hydraulic lifting table can be equipped with other additional devices, and can be any number or combination, which can achieve better use effect
it depends on the working pressure of your system, and then determine the size of your cylinder diameter. Generally, the system pressure is 31.5Mpa, but the working pressure is 16-25mpa. If your pressure is 200t and the working pressure is 25MPa, the cylinder diameter is 320mm, then directly use 402mm or 406mm 45 # seamless steel pipe for processing. However, it should be noted that the length of the stroke of the cylinder is the basis for determining the size of the cylinder pipe. For details, you can calculate the system pressure (KGL / cm2) * force area (cm2) = force (KGL) according to the above formula mentioned by chmchi

8. Is the lift temporary? Generally, if it is not suitable to place it on the basement roof, it will cause more load on the floor, and may cause cracks in the floor and damage to adjacent beams. If the floor and beam are strong enough, the corresponding load will be transferred to the foundation according to the standard, and the additional load will be calculated

9. "Self weight stress of elevator" should be the sum of compressive stress caused by self weight of elevator and bending stress caused by self weight. The maximum stress point should be determined according to the structure size and its weight. The compressive stress is equal to the pressure acting on the area divided by the cross-sectional area of the material. The bending moment stress is equal to the section coefficient of the material where the maximum bending distance is divided.