Hose assembly failure analysis

1, symptoms: hose inner tube is very hard, has been cracking.

   Analysis: temperature of the inner tube is easily precipitated plasticizer, which is a flexible hose can be a plastic material. Entrained gas oil oxidation allows the inner tube. Occur in the rubber products such oxidation reactions can be cured. Oxygen and temperature, will greatly accelerate the hardening of the hose tube. Occurred inside the inner tube cavitation also have the same effect.

2, symptoms: hose cracking internally and externally, but the elastic material is still soft at room temperature deflectable.

   Analysis: The likely reason is that the hose when the ambient temperature is very low deflection. Most standard hose is rated to -40 degrees, and some AQP hose rated temperature is -49 degrees, usually military hose rated temperature is -54 degrees, and some thermoplastic hose rated temperature is -54 degrees, poly four vinyl fluoride hose rated temperature is -73 degrees.

3, symptoms: hose rupture, banjo hose fittings peel the outer layer of wire reinforced rubber examination found that the entire length of the hose irregular wire breakage.

   Analysis: This indicates the pressure of the hose in a highly frequent fluctuations. SAE American Automobile Association, the two-story steel braided hose impact testing required at 133% of the recommended operating pressure of up to 200 000 cycles. About four-spiral hose SAE impact test requirements of up to 500 000 cycles. If the number of pulses within the extrapolation in a short time, more than one million times, the best choice for the enhancement layer wound hose.

4, symptoms: hose rupture, but not displayed on the entire length of the hose with multiple wire breakage. May be more than one hose rupture.

   Analysis: banjo fitting This indicates that the pressure has exceeded the minimum burst strength of the hose. Recommended to use higher-strength hose, or hydraulic lines appear abnormally high pressure conditions can cause malfunction.

HMB

A hydraulic manifold, it will a group of suction check valve (4), a group of pilot operated check valve, a group of overflow check valve, a pressure relief valve integrated through the oil passage. It is one-way valve and pressure relief valve with overflow, which with the oil pipe (14) communicated to the pressure control to the desired value. It has a check valve, when the system stops working, the control oil pressure also decreased, while closing the check valve, make parts quickly stop the movement, from the self-locking effect. The utility model has small size, used in hydraulic drive device is easy to install, making stand-alone compact structure.
Sovereignty items
Claims 1, to a hydraulic bolt manifold, it mainly consists of housing, oil inlet (1), the oil port (2) as well as oil passageway composition, wherein the inlet (1) and the inlet pipe (12) showed a communicating state, the inlet duct (12) ends of the two suction check valve (4) in the inlet was communicating state, each of the suction check valve (4) and the oil outlet pipe, respectively, with the pump (13) was connected state, the pump tubing (13) and the oil pipeline (14) was connected states, each of the oil pipeline (14) and check valve (5) is connected to the inlet pass, check valve (5) out of the oil port and manifold outlet port (2) was connected state, each of the oil pipeline (14) and the overflow check valve (6) is connected to the inlet pass, each overflow unidirectional the valve (6) of the oil outlet and the overflow pipe (17) connected to pass, each of the overflow pipe (17) and the pressure relief valve (7) showed the inlet metric banjo fitting communicating state, relief valve body and the overflow Movement connectivity status.

the development of cutting machine

1, after decades of development, CNC cutting machine and CNC cutting energy control systems has made two significant development, flame cutting energy from a single energy

Cutting the development of a variety of energy sources (flame, plasma, laser, water jet) cutting mode; CNC cutting machine control system from the original simple function, complex programming

And input methods, hose fittings developed to a high degree of automation has not fully functional, intelligent, graphical, networked control; drive system from the stepper drive,

Analog servo drive to today's all-digital servo drives;

CNC cutting machine main banjo fitting varieties include the following:

CNC flame cutting machine

CNC plasma cutting machine

CNC laser cutting machine

CNC Waterjet Cutting Machine

Other special special cutting equipment (such as CNC pipe cutting machine, CNC profile cutting machine, other non-metallic special cutting equipment, etc.)

PTFE tube

1 Product description: PTFE commonly known as "plastic" is the world's best engineering plastics, it has excellent chemical stability, corrosion resistance, self lubrication viscosity, electrical insulation and anti-aging ability. In -60 ℃ ~ +250 ℃ temperature long-term use in chemical, mechanical, electronic, electrical, military, aerospace and other fields has been widely used. Products are F4 products, jacking pipes, extrusion tubes, rods, steel liner F4 equipment, pipes, elbows, tees, crosses, reducers, compensators, chlorine pipe, fluorine plastic containers, fluorine plastic pumps.

2 PTFE hose assembly PTFE banjo fitting tube is made of stainless steel woven wire withhold joints composition, commonly known as Teflon (PTFE tube).

PTFE tube covered with stainless steel wire:
First, the corrugated tube (HF01)

The tube through special processing methods, changes the pipe can not be bent around the features, it can be used to connect a low mechanical graphite, ceramic glass pipes, can be used as tankers, tanks, containers, or to the reactor, the discharge pipe , can be used to balance the pipe connections or misalignment due to weather or other causes displacement from the pipe, size change, or to eliminate high-frequency mechanical vibrations. On special occasions but also for tubular reactor or a heat exchanger and so on.

  HF01-1 common type bellows

Available DN10-150mm, length 20-20000mm of F4, PVDF bellows

Standard 1.5mm-2.2mm thickness

Fatigue cycles> = 10000
Use
1 user requirements and connectors according to the characteristics of rational use of quick connector models. (Including the working pressure, the nature of the medium used and the flow rate, temperature, corrosive and ambient temperature, quantity and form of connection piping, etc.)
(2) For users connected to one end of the rigid pipe welded directly should pay attention to the following points:
(1) with special hooks will be inserted rubber seals kit removed after soldering joints until completely cooled, then the seal into the plug kit.
(2) If there is no hose assembly special hooks, also can be filled with a damp cloth or cotton plug seals the inner diameter of jacket to prevent damage to the sealing temperature soldering.
(3) rapid non-conductive material such as a metal plate on the inside in order to avoid breaking current burn affect seal performance and fitting accuracy.
3 spherical ball joints (male) and cone (female) in the use and transport should be protected, not scratches or collision, so as not to affect even the closure of the connection.
4 Select the correct type and reasonably quick connector to install, is to improve the life of two extremely important factors.

the hydraulic control valve

Hydraulic control valve

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(Referred hydraulic valve) is a hydraulic system control element for controlling the hydraulic system pressure of the fluid flow and flow direction, so as to meet the various requirements of different actions actuator.

Hydraulic control valves can be divided according to their role in directional control valves, pressure control valves and flow control valves three categories, corresponding by these valves are three basic circuit: direction control loop pressure control loop and speed loop. Press the control of different ways, can be divided into ordinary hydraulic valve hydraulic control valve, servo control valves, proportional control valve. Different forms depending on the installation, hydraulic valves manifold block can be divided into tubular, plate and cartridge type, and so are several.
Composition

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 Two-way cartridge valve from the cartridge device, the control cover, pilot control valves, manifold blocks, four-part

1 Cartridge - also known as the felling assembly, which consists of spool and sleeve, springs and seals four kinds of parts. Main function is used to control the direction of the main oil line, pressure and flow.

2 Control cover - from the banjo fitting cover of the embedded micro-pilot control element (throttling plug) as well as other parts and other accessories. It is mainly used to secure and guarantee Cartridge seal; communication control oil and felling the link between the control chamber and implement control.

3 pilot control valve - mounted on the control cover (also can be installed directly on the manifold body), is the implementation of action for felling Cartridge smaller gauge control valve. Mainly pain ¢ 10 ¢ 6 and the standard diameter solenoid valve, proportional valve, adjustable dampers, buffers, etc.. Felling larger size may need to use a smaller two-way cartridge valves for secondary control. Dimensions comply with ISO and national standards solenoid valve can be interchanged with the installation of similar products at home and abroad.

4 manifold blocks - used to install Cartridge, covers and other control valve control, communication and control circuit of the main oil blocks