Military Helmets Originate in Woks

One day in 1914, a French cook in the German artillery fire when the wok on top of the head, so only suffered minor injuries, while others have died from violent fire. Bullet-proof helmet from the beginning of the development.

Before the 1980s, infantry equipment helmets are mainly made of high fierce steel or other special steel stamping, the helmet heavier, bullet-proof and poor insulation, wear uncomfortable, there are two fragments of wounding Danger.

From the world's major national army helmets used in the material point of view, there are several helmets, Kevlar helmet, nylon helmet, UHMWPE helmet and helmet. US Kevlar helmet, in the 'Grenada' battle first to use. In today's world, in addition to the US military, Japan, Germany, Spain, Italy, Belgium, Singapore, Canada and other countries are equipped with the 'Kevlar' helmet. At present, the main equipment is nylon helmets the British army. France in the 20th century, 80 years replaced the new helmet, replacing the equipment in 1951 51 type helmet. In addition to France, Russia, Denmark, the Czech Republic, the Netherlands and other countries also use helmets, but also in the study of synthetic helmets, and some national army has been part of the equipment used.

TAITIANHydraulic production of Kevalar Bulletproof helmets

Four column press 315T

Table size 600*800mm

Open height 1000mm

Stroke 900mm

Fast up speed 210mm/s

Fast down speed 300mm/s

What is the Hydraulic Press(2)

Previous Article

Basic structure

Drive System

Hydraulic drive system mainly has two types, pump-driven and pump-accumulator-driven two types. The pump directly drives the pump of the drive system to supply the high pressure working fluid to the hydraulic cylinder. The flow distribution valve is used to change the direction of supplied oil. The relief valve is used to regulate the limited pressure of the system and at the same time act as a safety overflow. This kind of driving system has few links and simple structure. The pressure can be increased and decreased automatically according to the required working force, which reduces the power consumption. But the maximum work force and the maximum working speed of the hydraulic press are required to determine the capacity of the pump and its driving motor. This type of drive system for small and medium-sized hydraulic press, but also directly with the pump-driven system to large free forging hydraulic press(such as 120000 kN).

Pump-accumulator drive,

In this drive system there is an accumulator or group of accumulators. When the high-pressure working fluid pump supply a margin, the storage by the accumulator; and when the supply is not enough, it will complement the supply by the accumulator. This system can be used according to the average amount of high-pressure working fluid pump and motor capacity, but because the working fluid pressure is constant, a large amount of energy consumption, and the system links, the structure is more complex. This drive system is used for large hydraulic presses, or a set of drive systems to drive several hydraulic presses.

Structure type

According to the direction of the force, hydraulic press machine has two kinds structure: vertical and horizontal. Most of the hydraulic press is vertical, more extrusion hydraulic press machine is horizontal. According to the structure type, the hydraulic press has two columns, four columns, eight columns, welding frame and tie-bar frame and other types, medium and small vertical hydraulic machine has C-frame. C-frame hydraulic press open on three sides, easy to operate, but poor rigidity. In the vertical four-post hydraulic press for forging, the cylinder is fixed on the upper beam, the plunger is rigidly connected with the movable beam, and the movable beam is guided by the column, moving up and down under the action of the working fluid pressure. The beam can be moved back and forth on the table. An anvil and an anvil are mounted under the movable beam and on the work surface, respectively. Work force by the upper and lower beams and columns composed of the framework to bear. Pump-accumulator-driven large and medium-sized free-forging hydraulic press often uses three working cylinders, in order to get three work force. The working cylinder is also provided with an upwardly exerting balance cylinder and a return cylinder.

Product application

The equipment is especially suitable for bending, forming and flanging parts of center load parts. It can be used in punching and blanking processing after being equipped with punching and buffering device. It is widely used in electronic device,automobile industries,shipbuilding industry, pressure vessel industry and chemical industry.

What is the Hydraulic Press

Basic Introduction

Hydraulic press machine (also known as:oil press machine) is a use of liquid static pressure to process metal, plastic, rubber, wood, powder and other products machinery. It is often used for pressing and forming processes, such as: forging, stamping, cold extrusion, straightening, bending, flange, sheet metal deep drawing, powder metallurgy, press fit and so on.

Its principle is to use liquid pressure transmission that base on the Pascal's law, there are many different types. Of course, the use is also varied according to needs. If the transfer of pressure by the type of liquid points, there are two major categories:oil press and water press.

Working Principle

The basic principle is that the hydraulic pump is used to transport the hydraulic oil to the integrated cartridge valve block, and the hydraulic oil is distributed to the upper chamber or the lower chamber of the cylinder through the one-way valve and the relief valve, and the cylinder is moved under the action of high pressure oil,it is the equipment to use of liquid to transmit pressure. Liquids follow the Pascal's law when transferring pressure in a closed container. The hydraulic drive system of four-post hydraulic press is composed of power system, control system, executing system, auxiliary system and working medium. Power institutions usually use the oil pump as the driving force, usually uses the product-type pump. In order to meet the requirements of the speed of the implementing agencies, it will use one oil pump or a number of pumps. Low pressure (oil pressure less than 2.5MP) with the gear pump; medium pressure (oil pressure less than 6.3MP) with vane pump; high pressure (oil pressure less than 32.0MP) with a piston pump.