Designing a hydraulic system requires parameters such as first and then as detailed as possible

There is no such thing as pure hydraulics in this world. Hydraulics is a transmission mode and is an organic part of the whole product. The hydraulic system is a relatively independent combination of power source, control valve and actuator in order to complete this transmission.

In this sense, hydraulics are for mechanical service.

So the system is"Upside down"designed. First of all, you need to determine how much thrust (or torque) the machine wants you to provide, whether you need to hold thrust for a long time, how much speed you need, whether you need to be constant or variable speed, whether the inertia force when starting and stopping is large, and when you need to reduce the impact. Wait a minute.

Once the speed and thrust of the actuator have been determined, the power source can be selected, including the prime mover and the oil pump. For use in the workshop, the electricity is sufficient, the electric motor is preferred, the small flow system on the production line can be pneumatic, and the diesel engine is used for field flow use. Wait a minute.

Consider which hydraulic pump to use according to the working environment of the machine, the frequency of use, the pressure rating, the flow range, the cost constraints, etc.

According to the action requirements of the machinery, determine the selection of hydraulic valves. Electromagnetic ball valves and accumulators are used for pressure retention, and proportional valves are used for thrust changes at any time. High-speed reciprocating with servo valves, etc.

Complex systems often need to adjust the pressure and flow at all times, and several cylinders with different pressures operate at the same time, all relying on hydraulic valves. Nowadays, the development of hydraulic valves is much more complex than hydraulic pumps.

The rest of the system is called"Attachments", filters, coolers, oil tanks, pipes and fittings, etc., these elements should not be taken lightly"Run-and-drip leaks"It's an old problem with the hydraulic system, and it hasn't really been solved until now.

Electrical control is also an integral part of the hydraulic system, pressure and displacement sensors, flow meters, proximity switches and travel switches for control positions. , PLC, proportional amplifier and much more. may be a necessary component of the hydraulic system.

It is better for the electrical part of the hydraulic system to be completed by the same factory, otherwise it will be easy to rip off later.

This is very complicated, your entire excavator product book, compared with the above parameters, and the requirements for the material are very important, this is your master!

The main technical parameters of the hydraulic press are:

1. Nominal pressure. 2. The maximum working pressure of hydraulic pressure. 3. Return force.

4. The height of the working table is capacitated. 5. The maximum opening distance is in the middle. 6. The maximum stroke of the indenter.

7. Effective working surface (left and right, front and back). 8. Speed. 9. The size of the host.

10. Power.

Hope it helps. Thank you!

Motor power, oil pump displacement, system pressure,

The mobile hydraulic flap is generally composed of a flap platform, a main hoisting cylinder, a hydraulic control system, an electrical control system and a wheel stopper. Its working principle is to put the truck in place along the guide line according to the instructions of the flap platform, start the car blocking device, the wheel stopper blocks the rear wheel of the car, the main hoisting cylinder rises, so that the flap platform is inclined to a certain angle, and the material in the car is gradually discharged in this process. It is controlled by a hydraulic system, which can automatically unload all the loaded goods from tens to hundreds of tons within a few minutes.

When the material is unloaded, the automatic hydraulic flap unloader falls into place, the wheel stopper is retracted, and the car leaves the flap platform along the guide line to complete the entire unloading process, which has the advantage of small manual interference and high unloading efficiency. At the same time, the main lifting system of the mobile hydraulic flapper includes two multi-stage hydraulic cylinders ,...

The function of the hydraulic system is to increase the force by changing the pressure. A complete hydraulic system consists of five parts, namely power components, actuators, control elements, auxiliary components (accessories) and hydraulic oil. Hydraulic systems can be divided into two categories:

Hydraulic transmission system and hydraulic control system. The main function of the hydraulic transmission system is to transmit power and movement. The hydraulic control system should make the output of the hydraulic system meet specific performance requirements (especially dynamic performance), and the hydraulic system usually refers to the hydraulic transmission system.

The function of the hydraulic system is to increase the force by changing the pressure. A complete hydraulic system consists of five parts, namely power components, actuators, control elements, auxiliary components (accessories) and hydraulic oil. Hydraulic systems can be divided into two categories:

Hydraulic transmission system and hydraulic control system. The main function of the hydraulic transmission system is to transmit power and movement. The hydraulic control system should make the output of the hydraulic system meet specific performance requirements (especially dynamic performance), and the hydraulic system usually refers to the hydraulic transmission system.

Advantages of hydraulic system.

1. Small size and light weight;

2. High stiffness, high precision and fast response;

3. Large driving force, suitable for heavy-duty direct drive;

4. Wide range of speed regulation and various speed control methods;

5. Self-lubrication, self-cooling and long life;

6. It is easy to achieve safety protection.

The pressure of the hydraulic system generally refers to the pressure of the liquid, and the commonly used units are megapascals (mpa) and bar (bar) 10bar = 1mpa, and there is often said kilogram force, one kilogram force is 1 bar, that is, an atmospheric pressure.

Hydraulics, now refers to the application of a certain pressure to the liquid in a closed vessel, but the use of a thin tube to transfer the pressure (energy) to another place (application). It can be labor-saving and does not require mechanical transmission (transmission).

The design of the hydraulic pressure system generally includes the following steps: and the front noise.

a.Investigation and analysis of working conditions.

b.Schematic diagram of hydraulic system is drawn up.

c.Parameter calculation and component selection.

d.Performance checks.

Correct Answer: ABCD

1. According to the actual use of the equipment, determine the pressure requirements and working environment of the hydraulic system.

2. If the motor power is less than the engine power, the conventional hydraulic system can be selected, of course, the non-standard hydraulic system can be selected according to the demand.

3. If it is equipped with a DC motor, ensure that the continuous operation does not exceed 24 hours, and be careful not to reverse and idle with the pump.

4. Different combinations of hydraulic valves can realize a variety of circuits, and special hydraulic systems can also be customized according to actual needs.

How to choose a large hydraulic system, is the hydraulic pump for hydraulic transmission the same as the water pump for drainage? In general, a pump that sucks in and discharges liquid is either a positive displacement pump or a non-positive displacement pump. With a few exceptions, the pumps used in hydraulic systems are all positive displacement pumps.

All pumps that rely on a change in seal volume to draw in and out of liquid are called positive displacement pumps, or changes in seal volume, and are the same as all positive displacement pumps. The so-called sealing volume in vane pumps refers to the oil chamber (also known as the working space) consisting of two adjacent blades, a stator, a rotor, and two side plates. In piston pumps, it refers to an oil chamber consisting of a plunger and a column.

In gear pumps, the oil cavity is formed by the plunger cylinder, which is formed by the teeth and end caps of the two gears. How to select a large hydraulic system.

How to select a large hydraulic system: plunger 7 is installed in pump body 6. Under the action of spring 1, one end of the plunger rests on the outer surface of the eccentric wheel 8.

When the motor 9 drives the eccentric wheel to rotate, when the piston of the eccentric wheel hydraulic pump rotates eccentrically downward, the piston moves downward rapidly under the action of spring, and the volume of oil chamber a gradually increases, and becomes a part of the oil in the vacuum oil tank by tube 5 under this action. The small steel ball in the poppet valve 2 enters the oil chamber A. At this point, the hydraulic pump is sucking in the oil.

When the eccentricity is rotated upward, the plunger is pushed upward, the volume of the oil chamber A gradually decreases, and the oil in the chamber is affected. Compression creates a certain amount of pressure. At this point, the small steel ball in valve 2 falls and seals the suction pipe.

The oil pressure in the separate oil chamber pushes the steel ball in the valve 3 and flows into the working system along the oil pipe 4. In this way, when the motor drives the oil pump, the single piston pump converts the inlet of mechanical energy into mechanical energy. Acts on the pressure energy of liquid flow.

The positive displacement pump draws oil from the suction port during rotation, fills the oil chamber, and then transports it to the oil drain port for discharge. It can be seen that the liquid output per revolution of a positive displacement pump depends on the variable volume of the oil chamber and is independent of pressure. How to select a large hydraulic system.