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, hydraulic tube 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. hydraulic hose sleeve May be more than one hose rupture.
   Analysis: 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.

Manifold and valve member with the combination of research

According to incomplete statistics, in 2011 China's fluid sealing industry above designated size industrial output value of 77.271 billion yuan enterprises, an increase of 21%, of which the hydraulic industry completed 43.62 billion yuan, an increase of 18.47%; pneumatic industry completed 15.046 billion yuan, an increase of 29.60%; sealing industry completed 18.605 billion yuan, an increase of 23.95%. fluid airtight industry 125 key enterprises in 64 hydraulic industry, hydraulic industry 6, pneumatic industry 40, 15 sealing industry, economic efficiency index was 233.56, 226.44 over the same period last year. these key enterprises of the industrial output value of 33.424 billion yuan, an increase of 12.94 percent, of which the output value of 14.171 billion yuan hydraulic enterprises, an increase of 7.72%; hydraulic enterprise value of 533 million yuan, down 4.77%; pneumatic enterprise value of 8.639 billion yuan, an increase of 25.12%; sealing enterprise value of 7.32 billion yuan, an increase of 11.14% of the good prospects for development, hydraulic couplings but also attracted a lot of foreign investment in the industry. According to incomplete statistics, nearly two years fluid sealing industry to invest no less than 30 billion yuan, including construction machinery and other hydraulic hosting industry investment funds accounted for approximately 50% of total investment. Sany, Liugong, Long Engineering , Zoomlion, Shandong Changlin construction machinery and a number of well-known enterprises have invested or hydraulic corporate mergers and reorganizations. China is currently seeking high-end break more than 20 tons of hydraulic excavators used for basic control in the hands of an enterprise that Kawasaki company. Each discussed the matter, sand Bossen are solemnly. Domestic high-end hydraulic manifold block the kinds of situation, has attracted national attention. October 2011, after six months of planning, engineering machinery with high-pressure hydraulic manifold system industrialization and application of the preparatory body established collaborative work platform. Under the guidance of government departments in the industry, driven by the working platform focused on the China Construction Machinery Industry Association and the China Hydraulics Pneumatics & Seals Association, two associations of superior forces to HMB as a breakthrough, hose assembly taking manifold and accessories production Gakken a combined form, increased industry consolidation, the establishment of effective docking platform, and strive in the next 3 to 5 years to break China's construction machinery industry hydraulic and other accessories on foreign dependence.

Block brake with external and internal style sheets hold two kinds

Block brake with external and internal style sheets hold two kinds :
① The holding brake blocks : it is the length of stroke by manipulation device is divided into short stroke and long stroke block brake block brake . Short stroke block brake magnet mounted directly on the brake arm. When working around moving core pin rotation to achieve loose brake ; magnet is de-energized by the main spring tight gates . This brake compact, tight brakes and brake release moves fast , but the impact force . Long stroke brake block brake lever system can generate a large pine brake force , but the braking action is slow, suitable for large brake.
② inner sheets block brake : brake wheel brake block is located inside through the pedal , the brake lever and bumps block open , pressed tight inner surface of the brake wheel brakes, the brake pedal is released the spring back blocks and loose brake. This can also be hydraulic or pneumatic brakes and other manipulation. Zhang style brake blocks within a compact, dustproof , and can be used where installation space is restricted , widely used in various vehicles.
Block brake pad The standard applies to foreign holding dual brake blocks . Press the brake pad ( referred brake shoe ) and brake pad connection mode , and the brake shoe ends of the hinge shaft hole without sink hole into the following four categories:
Type B1 : hydraulic hose adapters rivet hole on the brake shoe , brake pad adhesive way connected , brake shoe ends of the hinge shaft bore no sink hole ;
B1C Type : brake shoe is no rivet hole type , way connected with the bonding pad system , brake shoe ends of the hinge shaft hole with sink holes ;
Type B2 : rivet holes on the brake shoe , brake pads connected with caulking , brake shoe ends of the hinge shaft is no counterbore end portion ;
B2C type : rivet holes on the brake shoe , brake pad coupled with riveting , brake shoe ends of the hinge shaft also has sink holes.
2 shaped brake disc brake is applied mine hoist brake system hydraulic actuators, accurate name would be: Normally closed rear disk brake cylinder , is currently used in more rear-mounted fuel tank , start the hoist when the output pressure hydraulic oil open brake , hoist to work, working brake, hydraulic station according to the conditions increase or decrease the pressure , the brake will provide braking force contrary , in the accident state, the hydraulic pressure Back to the residual pressure ,hose assembly the brake at maximum braking force in the shortest time to hoist parking .

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 hydraulic couplings 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 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) hose assembly 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 communicating state, relief valve body and the overflow Movement connectivity status.

various types of CNC cutting machine features and their applications

CNC flame cutting machine, cutting carbon steel having a large thickness cutting capacity, cutting costs low, but there is large deformation cutting, cutting accuracy is not high, and the cutting speed

Low, warm-up time cutting, hydraulic couplings piercing a long time, more difficult to adapt to the need for fully automated operation. Its major applications are limited to carbon steel, large thickness of the sheet metal cutting, in

, A thin steel plate cutting will be gradually replaced plasma cutting.

CNC plasma cutting machines, plasma cutting with a cutting width of the field, all the sheet metal can be cut, cutting speed, high efficiency, cutting speeds up to

10m/min or more. Plasma cutting underwater cutting to eliminate the noise generated, dust, harmful gases and arc pollution effectively improve the workplace environment

. The precise plasma cutting has made close to the laser cutting cutting quality level, with the high-power plasma cutting technology matures, cutting thickness exceeds 100mm, Extension

Wide CNC plasma cutting machine cutting range.

CNC laser cutting machine, with cutting speed, high precision, laser cutting machine is expensive, cutting the high cost, only suitable for sheet metal cutting, precision to

Requirements of the occasion,

CNC Waterjet cutting machine for cutting any material (metal, nonmetal, composite materials), high precision cutting, no thermal deformation, environmentally friendly

The cutting mode. Its disadvantage is that cutting speed is slow, inefficient and high cost cutting.

Other CNC cutting machine: including CNC pipe cutting machine, CNC steel cutting machine, CNC bevel cutting machine, CNC woodworking cutting machine, cutting equipment master these dedicated

Special profiles to be hose assembly used in a variety of CNC cutting, small manufacturers on the market.

Trends
With modern machinery industry development, the quality of the cut, the accuracy requirements continue to increase, to improve production efficiency, reduce production costs, with high intelligence

Automatic cutting function requirements are also improved. CNC cutting machine development must be adapted to the modern machinery industry development.

1, the development of CNC cutting machine. CNC cutting machine from several common application point of view, CNC flame cutting machine function and performance have been more perfect, the material cutting

Limitations (only cut steel plate), the cutting speed is slow, the production efficiency is low, gradually narrowing the scope of its application, there can be a large increase in the market.

Plasma cutting machine with cutting a wide range (can be cut all metal materials), cutting speed, high working efficiency, the future direction of development lies in plasma

Sub power technology improved, CNC plasma cutting system with problems, such as electrical power upgrade can be cut thicker plates; precision plasma technology improved and mention

High cutting speeds can be increased, cut quality and cutting accuracy; CNC system to adapt to improve and enhance plasma cutting, which can effectively improve work efficiency and cutting quality

.

Laser cutting machine with cutting speed, precision and cutting quality is good. Laser cutting technology has been supported by the state and promote the application of a high-tech

Surgery, especially the government stressed the need to revitalize the manufacturing sector, which is applied to the laser cutting technology development opportunities. In the countries to develop medium to long term development plans, turn the laser

Cutting as a key enabling technology, because it involves national security, national defense construction, high-tech industry and the development of cutting-edge science and technology, which raised to the laser cutting

A high degree of attention, and are bound to laser cutting machine manufacturing and upgrading bring great opportunities. A few years ago, the domestic sales of laser cutting machine mostly abroad for

Imported products, a very small share of domestic products. As users of laser cutting technology features the gradual deepening of understanding and demonstration use, led to the development of domestic enterprises, raw

Production laser cutting machine.

cloth hose specifications fabric hose solution

Cloth conveyor hose is from the inside layer, multi-layer cloth winding layer and the outer cover. Cloth attracts hose is from the inside layer, multi-layer cloth winding layer, spiral steel wire reinforced layer and outer layer.
Fabric hose wall roughness is mainly because there is no pressure molding molds and rubber thermal refining uneven, due to the low temperature extrusion, rubber compound containing recycled plastic is also one of the reasons, so in addition to strengthening the extrusion process operating outside ,
The solution:
Inner and outer layer of glue hose assembly recipe is best to avoid using recycled rubber.
   All kinds of fabric hose, hydraulic hose, hose assembly, armored high-pressure hose, high pressure steel wire braided hose, high pressure steel wire spiral rubber hose, high pressure oil drilling hose, high pressure marine oil hose, fire fire hose, high abrasion blasting hose, silicon fluorine rubber hose, large diameter hose, nylon resin tube, stainless steel metal hose, metal hose, conveyor idlers.