What is a Hand Pump?

Manual pump is a kind of pump that uses artificial force. One-way manual oil pump is a small hydraulic pump station that converts manual mechanical energy into hydraulic energy. With the use of matching oil cylinders and special tools, various operations can be performed, such as: lifting, bending, straightening, shearing, riveting, assembly, disassembly, and some building construction and military construction.

In the 1990s, China's mechanical and electrical industry introduced imported advanced assembly and fastening technology, and used high-strength hydraulic nuts and hydraulic tensioners as power sources, and also introduced ultra-high pressure manual hydraulic pumps.

A manual pump is a type of hydraulic pump. As a power source of the hydraulic system, fluid (hydraulic oil, saponified oil, water, etc.) is mainly used as a medium. Generally, the manual hydraulic pump is a horizontal plunger design, and the ultra-high pressure manual pump is converted by a double plunger to generate ultra-high pressure.

As a simple and convenient hydraulic power source, the ultra-high pressure manual hydraulic pump is widely used in many fields such as the shipbuilding industry, coal mining machinery, petrochemicals, metallurgy, electric power, and heavy machinery. And its small size, light weight, easy to carry, strong security and other advantages have been accepted by the majority of users. ^[1]

Ultra-high pressure manual hydraulic pump is an ideal power source for electromechanical assembly equipment. Currently it is mainly used in the following aspects:

1. Power source for threaded fasteners and tightening and tensioning devices.

It can realize precise control of bolt pre-tightening force, and the working pressure of hydraulic oil can reach 300Mpa. At present, China's coal, power, chemical and other industries use high-strength hydraulic nuts or hydraulic tensioners, and ultra-high-pressure manual night-wish pumps are used as the power source, and good results have been achieved.

2. Power source of smooth conical surface or cylindrical surface interference and disassembly in mechanical equipment.

Hydraulic nut is an effective tool for interference fit of smooth conical and cylindrical surfaces such as bearings, gears and rotors. It consists of a ring-shaped piston embedded with a sealing ring and a nut with internal threads. The ultra-high pressure manual hydraulic pump is used as the power source, and the ultra-high pressure enters from the round surface or the end surface of the nut body, so that the relative movement between the piston and the nut body is generated, thereby achieving the disassembly of interference fit.

3. Power source of hydraulic load cylinder or jack.

It is an ideal tool for installation and commissioning of heavy equipment. ^[2]