The principle of hydraulic hoist, high score to ask for a master to explain, do not copy

The composition and working principle of the hydraulic hoist.

The hydraulic hoist is generally composed of a hydraulic system and a hydraulic cylinder. Under the control of the hydraulic system, the inner wall of the piston in the hydraulic cylinder does axial reciprocating motion, so as to drive the connecting rod and the gate connected to the piston to do linear motion, so as to achieve the opening and closing of the orifice.

The hydraulic system includes power units, control and adjustment devices, auxiliary devices, etc. Multiple sets of hoists can share the same hydraulic system.

The power plant is generally a hydraulic pump, which converts mechanical energy into hydraulic energy. Hydraulic pumps generally use positive displacement pumps, such as vane pumps and piston pumps. Vane pumps and piston pumps have the advantages of compact structure, stable operation, low noise and long service life.

Although the piston pump is high, it can get high pressure, large flow, and adjustable flow. In recent years, domestic hydraulic hoists generally use medium and high pressure, so most of them use piston pumps. In addition, because of its importance, the hydraulic system of the hydraulic hoist is generally provided with two sets of hydraulic pumps, which are used as standby for each other.

The control and adjustment device refers to the hydraulic control valve group, including throttle valve, reversing valve, relief valve and other valve groups, which play a role in controlling and regulating the flow, direction and pressure of the hydraulic oil, so as to achieve various performance requirements for the hydraulic system. Most of the hydraulic control valves on the hoist are standard components and are usually cartridge-mounted. The cartridge valve has the advantages of strong combination function, high integration, low noise, good sealing, compact mechanism, and global maintenance.

Choose different structures and forms of pilot control valves, control covers, manifolds and cartridge combinations, you can obtain cartridge valve groups with reversing, pressure regulation, speed regulation and other functions. Because the hydraulic hoist with double lifting points cannot be mechanically synchronized like the winch hoist, the control valve group needs to consider synchronization measures.

Auxiliary devices include oil tanks, oil pipes, pipe joints, pressure gauges, oil filters, etc. The purpose of the oil tank is to store oil and dissipate heat, and can precipitate impurities in the oil, separate the air and moisture in the oil, etc. Oil pipes, pipe joints connect the power unit, the regulating control device, and the hydraulic cylinder to form a complete hydraulic circuit, and the impurities in the hydraulic oil will wear out the moving parts, increase the leakage and reduce the life of the components, and even block the valve group, etc., affecting the use of the hydraulic system, and it is very necessary to set up an oil filter to filter the hydraulic oil.

The hydraulic cylinder is an actuator in the hydraulic transmission, which converts the hydraulic energy of the hydraulic oil into machinery. The hydraulic cylinder is composed of the cylinder block, end cover, piston, piston rod, hanging head and other parts. According to the direction of action of the pressure oil in the hydraulic cylinder, it can be divided into two categories: single-acting hydraulic cylinder and double-acting hydraulic cylinder.

Single-acting hydraulic cylinders are often plunger or sleeve type, and can also be piston type. Double-acting hydraulic cylinders form two oil chambers, both of which can enter and exit pressure oil.

Experience it when you pull to death! You get the idea! Remember to push hard.

Slippage: It is caused by leakage in the cylinder or system of valves, and the --- seal or valve is replaced, and a system cleaning may solve the problem.

Correction: It's a problem of guidance, right?

Deviation: ? I don't know what an out-of-tolerance is.

Principle of hydraulic hoist: when the hydraulic pump changes the mechanical energy output by the prime mover into liquid pressure energy, enters the hydraulic cylinder through the oil pipeline and hydraulic valve, and then converts the liquid pressure energy into the mechanical energy of the working machine through the hydraulic cylinder and piston rod, so as to drive the gate to complete the opening or closing of the action.

After the hydraulic system is debugged, the oil in the oil tank should be replaced, the oil should be replaced after the first use of half a year, and then replaced every other year, and the inside of the oil tank should be cleaned every time the oil is changed to ensure the normal operation of the hydraulic system; Clean all oil filter elements regularly, and if the filter is severely clogged or damaged, they should be cleaned or replaced.

The principle of several common hydraulic solenoid valves.

Under the control of the hydraulic system, the inner wall of the piston in the hydraulic cylinder does axial reciprocating motion, so as to drive the connecting rod and gate connected to the piston to do linear motion, so as to achieve the purpose of opening and closing the orifice.

Chinese name hydraulic hoist.

Nature Instruments. The advantages are generally composed of a hydraulic system and a hydraulic cylinder.

Features to achieve the purpose of opening and closing orifice.

Structural composition.

1) Hydraulic upper transmission, the oil cylinders at both ends of the machine tool are placed on the slider field to directly drive the sliding work.

2) Adopt mechanical block structure, stable and reliable.

3) The slider stroke is motorized and fast, and the counter is displayed as a quick adjustment, manual fine-tuning, and the counter is displayed.

4) Adopt all-steel welded structure, which has sufficient strength and rigidity.

5) The slider synchronization mechanism adopts a torsion shaft to force synchronization.

6) Wedge type deflection compensation mechanism to ensure high bending accuracy.

There are a total of 15 specifications of QHLY series hydraulic hoist, which is suitable for the opening and closing of open-top arc gate gate of water conservancy and hydropower projects. This series of products can also be selected when the low-head down-the-hole arc gate gate is equipped with two hanging points, and the water can be closed by the self-weight of the gate. This series of products is suitable for working ambient temperatures of 25°C and 50°C.

There are two types of support types for the structure of this series of hydraulic hoists, which can be designed into three layout schemes according to the specific conditions of hydraulic buildings and the maximum opening requirements of the gate. The product has the characteristics of compact main structure, stable and reliable operation, convenient remote control and centralized control operation, conducive to optimizing the overall layout of hydraulic buildings, and advanced technology and economy.

Table 1 lists the basic parameters of 15 kinds of products in this series, and Table 2 and Table 3 respectively list the hydraulic cylinder structure matching connection size of type and type support type, which can be used for user reference; Tables 4 and 5 respectively list the dimensions of the hydraulic cylinder supports. Fig. 1, Fig. 2 are the structural diagram of the old bearing on the type hydraulic cylinder and the hydraulic cylinder; Fig. 3, Fig. 4, Fig. 5 respectively list the structure of type hydraulic cylinder and the structure diagram of type 1, type 2 two kinds of bearings; Fig. 6, Fig. 7 and Fig. 8 respectively represent the schematic diagram of three typical layout schemes of two types of support types of this series of products, which can be used for the designer's reference.

This series of products can be configured with a full set of pumping station equipment such as electrical control panel, gate opening instrument, pump set, valve group, oil tank and so on according to the needs of users. For the special requirements of users, the factory will provide special services that satisfy users.

Under the control of the hydraulic pressure system, the inner wall of the piston in the hydraulic cylinder does axial reciprocating motion, so as to drive the connecting rod and gate connected to the piston to do linear motion, so as to achieve the purpose of opening and closing the orifice.

Hydraulic hoist is a new type of opening and closing machinery integrating mechanical, electrical, hydraulic and instrumental, with hydraulic cylinder as the main body, oil pump, rough motor, oil tank, oil filter, hydraulic control valve assembly. The working principle is to use the motor as the power source, the motor drives the two-way oil pump to output pressure oil, and drives the piston rod through the oil circuit manifold and other components to control the opening and closing of the gate.