How to choose the hydraulic rescue tool correctly?

V. High pressure hose

High-pressure hoses are used to deliver ultra-high pressure hydraulic fluids and therefore must have excellent performance specifications.

1 . Work pressure ( English abbreviation WP) and burst pressure ( English abbreviation lip)

WP is the highest pressure at which the hose is normally used, and BP is the pressure reached when the hose breaks. The high-pressure hoses used by manufacturers and tools of hydraulic hydraulic tools must be marked with WP and BP data, which is also regulated by the German DIN 14751 standard. Otherwise, the personal safety of operators cannot be guaranteed. Because they are aging and other unpredictable factors hose, so the state of the hydraulic industry standards BP must be greater than or equal to 2 WP. 5 times to ensure the personal safety of operators. This must attract special attention. At present, domestic hoses still have some gaps in this indicator, but domestic hydraulic rescue tools equipped with imported high-pressure polyester hoses can be purchased on the domestic market. The WP of the imported hose is 63 MPa and BP is 16O. Megapascal, its ratio is greater than 2 . 5 times.

2 . Bending radius

The bending radius is the hose's rated working pressure (63 MPa ) . The minimum allowable bending radius. The smaller this value is, the higher the hose quality is, and the hose will not break due to frequent coiling. if possible. Should try to use the hydraulic rescue tools equipped with imported hoses, the bending radius of imported products is generally 6O mm, and domestic hose is about 15O mm.

3 . Service life

The service life is the number of years the hose can be used normally from the date of manufacture. Hydraulic hoses are often in a high-pressure state, and the different materials of their inner tubes, reinforcement layers and outer layers will age. When purchasing the product, the service life of the hose should be inquired and the manufacturer should guarantee that the service life of the imported high-pressure polyester hose is 8 to 10 years, while the domestic hose is 3 years.

Sixth, hydraulic oil

Hydraulic oil is the working medium used by the hydraulic rescue tools. Its role is to transmit power and lubricate the relative moving parts in the hydraulic system to reduce the friction and increase the service life of the parts. Since the hydraulic rescue tools often work in the open air, the temperature difference between north, south, and winter and summer is relatively large, so the hydraulic oil should have high requirements.

1 . Antioxidant, anti-aging, abrasion resistance.

In order to make the hydraulic oil work under ultra-high pressure, a variety of chemical additives are generally added to the hydraulic oil to enhance the anti-oxidation, anti-ageing and anti-grinding performance of the hydraulic oil, and to extend the service life of the tool to avoid the occurrence of different oil types. Chemical reaction, the same product is strictly prohibited to add different brands of hydraulic oil.

2 . Excellent viscosity-temperature characteristics

This characteristic means that the viscosity of the oil ( i.e. dilute consistency ) does not substantially change with the rise and fall of temperature. Hydraulic rescue tools often work in a field environment, using a large temperature difference. If the hydraulic oil is too thick at low temperature, the oil absorption efficiency will be reduced and the tool movement will be difficult. If the oil is too thin at high temperature, the lubricating performance will be reduced and the service life of the tool will be shortened. Domestic viscosity-temperature characteristics are the best in the 10th aviation hydraulic oil ( red color ) , its use temperature range is 3O ~ 55 °C , its low temperature performance meets the requirements, but in the summer outdoor, the ground temperature site exceeds 6O_c , the rescue tool Working under ultra-high pressure, the hydraulic system heats up, the oil temperature quickly reaches 7O_c or more, its viscosity is drastically reduced, lubrication performance is significantly reduced, and tool life is shortened. At present, some domestic products have already used imported high-quality hydraulic oil. The operating temperature range is 3O to 8O C , and the scope of use and reliability have been greatly improved.

VII. Correct understanding and understanding of "Protection against splashing"

The products of different manufacturers will have different characteristics. The products should be selected according to their own actual conditions, and at the same time, they should have a correct understanding of some special functions proposed by the manufacturer. In the work, if it is often encountered a round steel that requires a cutter ( also known as a shear ) or a multi-functional pliers with a fixed diameter of 20 mm or more, the breakage prevention tool should be considered. This kind of tool is generally solved by changing the angle of the cutting edge. The slope of the cutting edge is small and can achieve the purpose of preventing splashing, but at the same time it will cause the cutting speed to decrease, especially the cutting edge curling or chipping, resulting in tools. damage. The author believes that it is worth discussing with the purpose of sacrificing the cutting speed and destroying the cutting edge to achieve the prevention of splashing. In actual combat, tools can quickly cut large diameter round steel, and it is of real significance to ensure that no breaks, curls, and chippings are encountered in actual combat.

Eight, quick connector

Quick connectors are available in both quick and unsecured joints. The disadvantage of the unseated joint is that the joint will disengage itself in the event of an accidental collision. The quick-locking quick connector should be used as far as possible. Only after the safe turn-to-turn lock is opened, can the connector be disassembled and the quick connector should be protected from oil leakage. As a high-tech product, the hydraulic rescue tool cannot simply select products by price. It should be evaluated through various methods such as comparison of technical indicators and on-site testing. At the same time, the level of market feedback and after-sales service is also an important reference. At present, the domestic hydraulic break tools have completely reached or even exceeded the foreign similar products, such as the underwater rescue equipment in our navy service, using a hydraulic rescue tool produced by a company in China, and received wide acclaim. It is believed that the domestic hydraulic rescue tools must be able to meet the increasing demand for hydraulic rescue tools in special industries such as firefighting.

Some of the information in this article comes from the Internet and is reorganized and edited by China Rescue Equipment Network.