Direct-acting solenoid valve: Principle: power, electromagnetic coil generates electromagnetic force the closure of parts brought from the seat, the valve opens; power, the electromagnetic force disappears, spring to close the pressure in the valve seat, valve The door is closed. Characteristics: in vacuum, negative pressure, zero pressure can work, but the path is generally not more than 25mm.
Step-by-step direct-acting solenoid valves: Principles: It is a direct-acting and pilot - a combination of principle, when no pressure difference between inlet and outlet, the power, the electromagnetic force directly to the pilot valve and main valve to turn off parts in turn lift the valve opens. When the inlet and outlet reaches the start pressure, electricity, electromagnetic force pilot valve, main valve cavity pressure rise on chamber pressure drop, which use differential pressure to the main valve is pushed upwards; power failure, the pilot valve with a spring force or medium pressure to promote off, move down, so that the valve is closed. Features: * action also in the zero pressure or vacuum, high pressure, but the power is larger, the requirements must be mounted horizontally.
Pilot solenoid valve: Principle: power, electromagnetic force pilot hole open on the chamber pressure fell rapidly, close the pieces around the formation of low and high differential pressure, fluid pressure to promote off pieces to move up, the valve opens; energized, the spring force to the pilot hole Close the inlet pressure through the bypass hole quickly chamber off valve formed around a high pressure differential, the fluid pressure to promote the closure of parts moving down, close the valve. Features: higher maximum fluid pressure range can be freely installed (to be customized) but must meet the fluid pressure conditions. Solenoid valve from the valve structure and materials of different and the difference principle, be divided into six branch subclasses: straight diaphragm structure, step straight diaphragm structure, the pilot diaphragm structure, direct acting piston structure, step-by-step direct acting piston structure, the pilot piston structure.
Sunday, March 25, 2012
The cord set is made up of an elongated electric cord containing at least two flexible wires
The end of the electric cord connected to the electric tool is typically provided with a molded strain relief flexible body attached to the outer insulator of the electric cord and mechanically connected to the electric tool housing. Electrical tools are conventionally provided with a power cord set made up of an elongated electric cord having an electric plug at one end and the opposite end mechanically and electrically connected to the electric tool. The flexible body of the strain relief prevents the wires within the electrical cord from being broken as a result of being repeatedly bent in a small radius.
The cord set is made up of an elongated electric cord containing at least two flexible wires, an electric plug affixed to one end of the electric cord and a strain relief connector assembly affixed to the other end of the electric cord. The strain relief connector assembly is provided with an elongated flexible body extending about a length of the electric cord adjacent the end for mechanically attaching to and projecting into the electric tool housing.
The length and the end treatment of the wire leads of the power cord set varies depending upon the application, therefore, it is quite common for a power tool manufacturer to inventory dozens of different power cord sets. While power cord sets may vary somewhat due to the desired cord length, the primary distinction between varying stock keeping units (SKU's) is the length of the wire leads extending and the type of electrical connector formed on the wire end.
The number of SKU's for cord sets is not only a problem at the time of manufacturing due to the inventory requirements for each of the cord sets, but it remains a problem throughout the product's life since replacement cord sets have to be maintained in product service centers because cord sets are a rather frequent replacement item.
The power cord set of the present invention is provided for use with any one of a plurality of electric tools that have a housing, an electric powered implement oriented within the housing.
The strain relief-connector assembly is further provided with an electrical connector electrically connected to the at least two wires in the electric cord with the electrical connector projecting into the tool housing. The electric powered implement is provided with an internal pair of wires having a pair of connectors for cooperation with the strain relief connector assembly.
The cord set is made up of an elongated electric cord containing at least two flexible wires, an electric plug affixed to one end of the electric cord and a strain relief connector assembly affixed to the other end of the electric cord. The strain relief connector assembly is provided with an elongated flexible body extending about a length of the electric cord adjacent the end for mechanically attaching to and projecting into the electric tool housing.
The length and the end treatment of the wire leads of the power cord set varies depending upon the application, therefore, it is quite common for a power tool manufacturer to inventory dozens of different power cord sets. While power cord sets may vary somewhat due to the desired cord length, the primary distinction between varying stock keeping units (SKU's) is the length of the wire leads extending and the type of electrical connector formed on the wire end.
The number of SKU's for cord sets is not only a problem at the time of manufacturing due to the inventory requirements for each of the cord sets, but it remains a problem throughout the product's life since replacement cord sets have to be maintained in product service centers because cord sets are a rather frequent replacement item.
The power cord set of the present invention is provided for use with any one of a plurality of electric tools that have a housing, an electric powered implement oriented within the housing.
The strain relief-connector assembly is further provided with an electrical connector electrically connected to the at least two wires in the electric cord with the electrical connector projecting into the tool housing. The electric powered implement is provided with an internal pair of wires having a pair of connectors for cooperation with the strain relief connector assembly.
Characteristics of the air compressor
Characteristics of the air compressor:By the motor directly drives the compressor, so that the crankshaft to produce rotary motion to drive the connecting rod so that the piston reciprocating motion, causing the cylinder volume change. Air due to pressure changes within the cylinder through the intake valve into the cylinder after the air filter (muffler), due to the narrowing of the cylinder volume in the compression stroke, the role of compressed air through the exhaust valve, the exhaust pipe, one-way valve (check valve) into the gas tank, and automatically shut down by the pressure switch control when the exhaust pressure to rated pressure of 0.7MPa. When the gas tank pressure down to 0.5 - 0.6MPa pressure switch automatically join the start.
Working pressure of the gas source should be about 20% higher than the maximum working pressure in the pneumatic system, to consider the loss along the way and partial loss of the gas pipeline. If some parts of the system pressure to low pressure relief valve to gas supply. Rated discharge pressure of the air compressor is divided into low voltage (0.7 ~ 1.0MPa), medium pressure (1.0 to 10MPa), high pressure (10 ~ 100MPa) and ultra-high pressure (100MPa or more) can be selected according to actual demand. Common use of pressure is generally 0.7-1.25 First, select the type of air compressor air compressor features. The pneumatic system pressure and flow two parameters to determine the air compressor output pressure pc and the inhalation flow rate qc, and ultimately select the air compressor models.
To make the air compressor to normal and reliable operation to ensure that the service life of the unit are required to develop a detailed maintenance plan, the implementation of fixed-man operation, regular maintenance, regular inspection and maintenance of air compressor to keep clean, no oil, no dirt.
Moisture in the air may condense in the oil and gas separation tank, especially in wet weather, when the exhaust temperature is lower than the air pressure dew point or shutdown cooling, there will be more condensed water precipitates. Oil contains too much moisture will cause the emulsification of lubricating oil, affecting the safe operation of the machine,
Each run of the air compressor 2000h for the removal of the cooling surface of dust, the need to purge the coolers on the fan bracket to the manhole cover open, with dust blowing air gun cooler purge until the cooling surface dust purged. Yet if the cooling surface dirt serious, difficult to clean, purge, and can to remove the cooler, pour the oil cooler and four import and export closed to prevent dirt from entering, and then use compressed air to blow dust or water on both sides of rinse, and finally drying the surface of the water stains. Back in place.
Working pressure of the gas source should be about 20% higher than the maximum working pressure in the pneumatic system, to consider the loss along the way and partial loss of the gas pipeline. If some parts of the system pressure to low pressure relief valve to gas supply. Rated discharge pressure of the air compressor is divided into low voltage (0.7 ~ 1.0MPa), medium pressure (1.0 to 10MPa), high pressure (10 ~ 100MPa) and ultra-high pressure (100MPa or more) can be selected according to actual demand. Common use of pressure is generally 0.7-1.25 First, select the type of air compressor air compressor features. The pneumatic system pressure and flow two parameters to determine the air compressor output pressure pc and the inhalation flow rate qc, and ultimately select the air compressor models.
To make the air compressor to normal and reliable operation to ensure that the service life of the unit are required to develop a detailed maintenance plan, the implementation of fixed-man operation, regular maintenance, regular inspection and maintenance of air compressor to keep clean, no oil, no dirt.
Moisture in the air may condense in the oil and gas separation tank, especially in wet weather, when the exhaust temperature is lower than the air pressure dew point or shutdown cooling, there will be more condensed water precipitates. Oil contains too much moisture will cause the emulsification of lubricating oil, affecting the safe operation of the machine,
Each run of the air compressor 2000h for the removal of the cooling surface of dust, the need to purge the coolers on the fan bracket to the manhole cover open, with dust blowing air gun cooler purge until the cooling surface dust purged. Yet if the cooling surface dirt serious, difficult to clean, purge, and can to remove the cooler, pour the oil cooler and four import and export closed to prevent dirt from entering, and then use compressed air to blow dust or water on both sides of rinse, and finally drying the surface of the water stains. Back in place.
Wednesday, March 14, 2012
Products banned hazardous substance limit
In 1, RoHS directive banned hazardous substance limit,
Serial number material group allowable concentration
Cadmium and its compounds 1 is less than or equal to 100ppm
Lead and its compounds 2 is less than or equal to 1000ppm
Hexavalent chromium and its compounds 3 six 1000ppm
The 4 mercury and its compounds is less than or equal to 1000ppm
5 specific flame retardants PBBs = 1000ppm
6 specific flame retardants PBDEs = 1000ppm
In order to ensure that the company power cord products comply with the EU RoHS Directive requires strict control of raw materials, outsourcing parts on 6 kinds of
Harmful substances limits, foreign parts, purchased parts of harmful substances in the limit values are shown in Table 1, the company manufactured products containing harmful substances
Limit value should also be consistent with the above regulations.
Different target materials banned substances of the allowable concentration,
Object material objects prohibited substances permitted concentration
Plastic, rubber, thin film, paint, lead < 100ppm ( ICP high precision analysis method )
Ink, pigment, dye, copper wire,
Conventional metal parts
Cadmium < 5ppm ( ICP high precision analysis method )
Metal alloy lead
The following 0.35wt% -- Steel
The following 0.4wt% -- aluminum alloy
The following 4wt% -- copper alloy
( ICP high precision analysis method)
Lead free solder lead < 100ppm
High melting point solder lead content of more than 85% tin lead solder
Packaging material Pb ( lead) + Cd ( CD ) + Hg (Hg ) + Cr6 + ( chromium six ) < 100ppm ( ICP high precision analysis method)
The metal alloy material, lead-free solder and high melting point solder in lead content as specified in table 2.
4.3 in response to domestic and international the product of polycyclic aromatic hydrocarbon carcinogens ( PAHs ) Limited provisions, export products must be
Excluding the above provisions in material.
Limited value of polycyclic aromatic hydrocarbons
Serial number PAHs compounds limits PPM
1 Naphthalene naphthalene is less than or equal to 0.5
2 Acenaphthylene acenaphthylene is less than or equal to 0.5
3 Acenaphthene acenaphthene power supply cord acenaphthene is less than or equal to 0.5
4 Fluorene fluorene is less than or equal to 0.5
5 Phenanthrene Fe = 0.5
6 Anthracene anthracene is less than or equal to 0.5
7 Fluoranthene fluoranthene is less than or equal to 0.5
8 Pyrene P < 0.5
9 Benzo ( a ) anthracene benzo ( a < 0.5 ).
10 Chrysene flexor = 0.5
11 Benzo ( b ) fluoranthene benzo ( b ) fluoranthene is less than or equal to 0.5
12 Benzo ( k ) fluoranthene benzo ( k ) fluoranthene is less than or equal to 0.5
13 Benzo ( a ) pyrene benzo ( a ) P = 0.5
14 Indeno ( 1, 2, 3-cd ) indinavir benzene (1, 2, 3-cd < 0.5 ) pyrene
15 Dibenzo ( a, H ) anthracene two benzo ( a, H = 0.5 ).
16 Benzo ( g, HI ) perylene benzo ( g, HI ) two rylene = 0.5
Serial number material group allowable concentration
Cadmium and its compounds 1 is less than or equal to 100ppm
Lead and its compounds 2 is less than or equal to 1000ppm
Hexavalent chromium and its compounds 3 six 1000ppm
The 4 mercury and its compounds is less than or equal to 1000ppm
5 specific flame retardants PBBs = 1000ppm
6 specific flame retardants PBDEs = 1000ppm
In order to ensure that the company power cord products comply with the EU RoHS Directive requires strict control of raw materials, outsourcing parts on 6 kinds of
Harmful substances limits, foreign parts, purchased parts of harmful substances in the limit values are shown in Table 1, the company manufactured products containing harmful substances
Limit value should also be consistent with the above regulations.
Different target materials banned substances of the allowable concentration,
Object material objects prohibited substances permitted concentration
Plastic, rubber, thin film, paint, lead < 100ppm ( ICP high precision analysis method )
Ink, pigment, dye, copper wire,
Conventional metal parts
Cadmium < 5ppm ( ICP high precision analysis method )
Metal alloy lead
The following 0.35wt% -- Steel
The following 0.4wt% -- aluminum alloy
The following 4wt% -- copper alloy
( ICP high precision analysis method)
Lead free solder lead < 100ppm
High melting point solder lead content of more than 85% tin lead solder
Packaging material Pb ( lead) + Cd ( CD ) + Hg (Hg ) + Cr6 + ( chromium six ) < 100ppm ( ICP high precision analysis method)
The metal alloy material, lead-free solder and high melting point solder in lead content as specified in table 2.
4.3 in response to domestic and international the product of polycyclic aromatic hydrocarbon carcinogens ( PAHs ) Limited provisions, export products must be
Excluding the above provisions in material.
Limited value of polycyclic aromatic hydrocarbons
Serial number PAHs compounds limits PPM
1 Naphthalene naphthalene is less than or equal to 0.5
2 Acenaphthylene acenaphthylene is less than or equal to 0.5
3 Acenaphthene acenaphthene power supply cord acenaphthene is less than or equal to 0.5
4 Fluorene fluorene is less than or equal to 0.5
5 Phenanthrene Fe = 0.5
6 Anthracene anthracene is less than or equal to 0.5
7 Fluoranthene fluoranthene is less than or equal to 0.5
8 Pyrene P < 0.5
9 Benzo ( a ) anthracene benzo ( a < 0.5 ).
10 Chrysene flexor = 0.5
11 Benzo ( b ) fluoranthene benzo ( b ) fluoranthene is less than or equal to 0.5
12 Benzo ( k ) fluoranthene benzo ( k ) fluoranthene is less than or equal to 0.5
13 Benzo ( a ) pyrene benzo ( a ) P = 0.5
14 Indeno ( 1, 2, 3-cd ) indinavir benzene (1, 2, 3-cd < 0.5 ) pyrene
15 Dibenzo ( a, H ) anthracene two benzo ( a, H = 0.5 ).
16 Benzo ( g, HI ) perylene benzo ( g, HI ) two rylene = 0.5
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