Hydraulic machines are machinery and tools that use liquid fluid power to do simple work. Heavy equipment is a common example.
In this type of machine, hydraulic fluid is transmitted throughout the machine to various hydraulic motors and hydraulic cylinders and which becomes pressurised according to the resistance present. The fluid is controlled directly or automatically by control valves and distributed through hoses and tubes.
The popularity of hydraulic machinery is due to the very large amount of power that can be transferred through small tubes and flexible hoses, and the high power density and wide array of actuators that can make use of this power.
Hydraulic machinery is operated by the use of hydraulics, where a liquid is the powering medium.
A fundamental feature of hydraulic systems is the ability to apply force or torque multiplication in an easy way, independent of the distance between the input and output, without the need for mechanical gears or levers, either by altering the effective areas in two connected cylinders or the effective displacement (cc/rev) between a pump and motor. In normal cases, hydraulic ratios are combined with a mechanical force or torque ratio for optimum machine designs such as boom movements and trackdrives for an excavator.
If a hydraulic rotary pump with the displacement 10 cc/rev is connected to a hydraulic rotary motor with 100 cc/rev, the shaft torque required to drive the pump is 10 times less than the torque available at the motor shaft, but the shaft speed (rev/min) for the motor is 10 times less than the pump shaft speed. This combination is actually the same type of force multiplication as the cylinder example (1) just that the linear force in this case is a rotary force, defined as torque.
For the hydraulic fluid to do work, it must flow to the actuator and or motors, then return to a reservoir. The fluid is then filtered and re-pumped. The path taken by hydraulic fluid is called a hydraulic circuit of which there are several types. Open center circuits use pumps which supply a continuous flow. The flow is returned to tank through the control valve's open center; that is, when the control valve is centered, it provides an open return path to tank and the fluid is not pumped to a high pressure. Otherwise, if the control valve is actuated it routes fluid to and from an actuator and tank. The fluid's pressure will rise to meet any resistance, since the pump has a constant output. If the pressure rises too high, fluid returns to tank through a pressure relief valve. Multiple control valves may be stacked in series [1]. This type of circuit can use inexpensive, constant displacement pumps.
Closed center circuits supply full pressure to the control valves, whether any valves are actuated or not. The pumps vary their flow rate, pumping very little hydraulic fluid until the operator actuates a valve. The valve's spool therefore doesn't need an open center return path to tank. Multiple valves can be connected in a parallel arrangement and system pressure is equal for all valves.
2011年12月14日星期三
2011年10月11日星期二
Linehaul Heavy Duty Joins VIPAR Network
Linehaul Heavy Duty LLC has joined the VIPAR Heavy Duty network of distributors. Linehaul Heavy Duty was formed in August 2011 after Michael Thiers and his wife, Courtney Bennett, purchased the Fairfield, Ohio, branch of Louisville, Ky.-based Republic Diesel.
Linehaul's core business is in heavy duty truck parts, servicing both on-highway and vocational customers in the metro Cincinnati, northern Kentucky, southeastern Indiana and western Ohio areas. With a strong focus on wheel-end and undercarriage parts, the company’s inventory also includes a broad offering of well-known products and brands. In addition, Linehaul Heavy Duty provides flywheel resurfacing, hydraulic hose service and general drive-in truck repair.
“We are pleased to welcome Linehaul to the VIPAR Heavy Duty family of distributors,” said Jim Pennig, vice president, business development, VIPAR Heavy Duty. “Though new to the marketplace as Linehaul, their business has a strong reputation among customers for its great selection of products and outstanding customer service.”
Prior to starting Linehaul Heavy Duty, Thiers was sales manager for Republic Diesel since 2006. He has many years of experience in the industry, having spent four years as vice president of sales for DST Inc., two-and-a-half years as western regional manager for ArvinMeritor and six years as product manager for NuWay Anchorlok.
Linehaul's core business is in heavy duty truck parts, servicing both on-highway and vocational customers in the metro Cincinnati, northern Kentucky, southeastern Indiana and western Ohio areas. With a strong focus on wheel-end and undercarriage parts, the company’s inventory also includes a broad offering of well-known products and brands. In addition, Linehaul Heavy Duty provides flywheel resurfacing, hydraulic hose service and general drive-in truck repair.
“We are pleased to welcome Linehaul to the VIPAR Heavy Duty family of distributors,” said Jim Pennig, vice president, business development, VIPAR Heavy Duty. “Though new to the marketplace as Linehaul, their business has a strong reputation among customers for its great selection of products and outstanding customer service.”
Prior to starting Linehaul Heavy Duty, Thiers was sales manager for Republic Diesel since 2006. He has many years of experience in the industry, having spent four years as vice president of sales for DST Inc., two-and-a-half years as western regional manager for ArvinMeritor and six years as product manager for NuWay Anchorlok.
2011年7月25日星期一
Eaton Corp.'s CEO predicts $16 billion in sales by year's end as company reports sales up 21 percent
Eaton Corp. is heading toward all-time sales and profit records despite the uncertainties about government debt here and around the globe and their impact on economic growth.
The world's growing preoccupation with energy and energy efficiency has a lot to do with Eaton's forecast Monday that it will sell more than $16 billion in industrial equipment this year -- up by nearly a fifth over last year. About 55 percent of Eaton's sales are outside the United States.
"People are recognizing that energy prices are going to do nothing but go up from here, and they are investing in those types of solutions that will enable them to reduce their energy costs," said Alexander "Sandy" Cutler, Eaton's chairman, president and chief executive officer.
"That is the great mega-trend that Eaton has been attached to for some time since we are a power management company," he said in an interview after releasing the company's financial results for the second quarter.
The Cleveland company is a diversified global manufacturer of power management technologies. The company employs 73,000 worldwide, including divisions here in Cleveland, Euclid, Parma and Aurora, but does not release employment information on a country-by-country basis.
Eaton manufacturers everything from transmissions, clutches and hybrid systems for heavy-duty trucks, to hydraulics for agricultural equipment, from components for aircraft to superchargers and engine valves for cars, from hydraulic systems for wind turbines to the electrical guts of solar arrays, from electrical equipment for buildings to electronic power conditioning systems for computer data centers.
Cutler said the company expects sales to grow by 19 percent this year compared to 2010 and profits to increase by 42 percent to more than $4 per share of stock - both records for the company that turns 100 years old in a few months.
During the second quarter -- April through June -- Eaton's profits soared by 49 percent to $336 million, or 97 cents per share. That compares to $226 million, or 66 cents per share, in the second quarter of 2010, the company's financial report shows.
Sales for the second quarter were $4.09 million, up 21 percent from the $3.38 million in the same period last year.
Each of Eaton's five business segments showed double-digit growth in the second quarter compared to the same period last year, both in sales and profits.
"We are completing a very strong second quarter, a strong second half and what we expect to be a record year in both sales and profits," Cutler told financial analysts in a public teleconference, now available on the investor relations section of Eaton's web site.
Cutler added that at this point, sales and profits in 2012 look healthy as well. He said the company estimates that global manufacturing will increase by 5.2 percent next year.
But for the rest of this year, Cutler said sales should exceed $16 billion. The accelerating business growth this year have already prompted the company to adjust its 2011 sales and earnings forecast four times.
In January, the company forecast an 8 percent market growth, in February, 9 percent, in April, 10 percent and now 11 percent. The company expects this year's net earnings, or profits, to run between $3.90 and $4.10 per share. That's up from a January forecast of $3.50 to $3.80 per share.
Eaton's financial results beat analysts' predictions. The company's share price on the New York Stock Exchange increased by $1.43 to $52.59 per share.
The world's growing preoccupation with energy and energy efficiency has a lot to do with Eaton's forecast Monday that it will sell more than $16 billion in industrial equipment this year -- up by nearly a fifth over last year. About 55 percent of Eaton's sales are outside the United States.
"People are recognizing that energy prices are going to do nothing but go up from here, and they are investing in those types of solutions that will enable them to reduce their energy costs," said Alexander "Sandy" Cutler, Eaton's chairman, president and chief executive officer.
"That is the great mega-trend that Eaton has been attached to for some time since we are a power management company," he said in an interview after releasing the company's financial results for the second quarter.
The Cleveland company is a diversified global manufacturer of power management technologies. The company employs 73,000 worldwide, including divisions here in Cleveland, Euclid, Parma and Aurora, but does not release employment information on a country-by-country basis.
Eaton manufacturers everything from transmissions, clutches and hybrid systems for heavy-duty trucks, to hydraulics for agricultural equipment, from components for aircraft to superchargers and engine valves for cars, from hydraulic systems for wind turbines to the electrical guts of solar arrays, from electrical equipment for buildings to electronic power conditioning systems for computer data centers.
Cutler said the company expects sales to grow by 19 percent this year compared to 2010 and profits to increase by 42 percent to more than $4 per share of stock - both records for the company that turns 100 years old in a few months.
During the second quarter -- April through June -- Eaton's profits soared by 49 percent to $336 million, or 97 cents per share. That compares to $226 million, or 66 cents per share, in the second quarter of 2010, the company's financial report shows.
Sales for the second quarter were $4.09 million, up 21 percent from the $3.38 million in the same period last year.
Each of Eaton's five business segments showed double-digit growth in the second quarter compared to the same period last year, both in sales and profits.
"We are completing a very strong second quarter, a strong second half and what we expect to be a record year in both sales and profits," Cutler told financial analysts in a public teleconference, now available on the investor relations section of Eaton's web site.
Cutler added that at this point, sales and profits in 2012 look healthy as well. He said the company estimates that global manufacturing will increase by 5.2 percent next year.
But for the rest of this year, Cutler said sales should exceed $16 billion. The accelerating business growth this year have already prompted the company to adjust its 2011 sales and earnings forecast four times.
In January, the company forecast an 8 percent market growth, in February, 9 percent, in April, 10 percent and now 11 percent. The company expects this year's net earnings, or profits, to run between $3.90 and $4.10 per share. That's up from a January forecast of $3.50 to $3.80 per share.
Eaton's financial results beat analysts' predictions. The company's share price on the New York Stock Exchange increased by $1.43 to $52.59 per share.
2011年6月6日星期一
PIRTEK Commerce South Awarded Hose Overhaul
Take care of your customers and your customers will take care of you. Al Larson Boat Shop rebuilds, restores, and repairs all types of sea craft, but when it comes to hydraulic work they always call PIRTEK. A marine spill response barge needed a complete hose overhaul. The barge is a storage vessel with skimmers that can be launched to contain and remove contaminants from the water.
PIRTEK Commerce South went to San Pedro, California to replace 240 hoses, adaptors, quick disconnects, and gauges on the barge, which included two on-board cranes. All of the exposed hose ends were wrapped with Densyl Tape, and the hydraulic threads were sealed with Loctite. The hoses on deck were all fitted with PIRTEK protective hose sleeves. Plastic caps and plugs were used to ensure against any open ports. After assembly of all the hoses, they were cleaned for contaminants. Finally, 720 gallons of hydraulic fluid were removed and replaced, as well as all the filters.
The customer was very happy with the work provided by PIRTEK Commerce South. They completed the job in 205 hours with 5 team members including Justin Madrid, Mike Metzdorff, Heliodoro Huerta, Robert Andrade, and Gil Moyers.
Rockledge, Florida-based PIRTEK is the world's leading service provider of ETA 1 Hour On-Site Hose Replacement. PIRTEK offers a 24 hour, 7 day service that serves almost every facet of industry including construction, manufacturing, transportation, agriculture and engineering among others. When an equipment breakdown occurs, it often results in costly delays in time and labor before the proper replacement hose is located and installed but PIRTEK vans carry the component parts necessary to manufacture hose assemblies on site. Hose and fittings can also be purchased over-the-counter at PIRTEK's national network of service centers that serve as home bases to its mobile fleet. There are nearly 40 PIRTEK service centers nationwide and over 170 PIRTEK mobile service vans serving major metropolitan markets throughout the country.
PIRTEK Commerce South went to San Pedro, California to replace 240 hoses, adaptors, quick disconnects, and gauges on the barge, which included two on-board cranes. All of the exposed hose ends were wrapped with Densyl Tape, and the hydraulic threads were sealed with Loctite. The hoses on deck were all fitted with PIRTEK protective hose sleeves. Plastic caps and plugs were used to ensure against any open ports. After assembly of all the hoses, they were cleaned for contaminants. Finally, 720 gallons of hydraulic fluid were removed and replaced, as well as all the filters.
The customer was very happy with the work provided by PIRTEK Commerce South. They completed the job in 205 hours with 5 team members including Justin Madrid, Mike Metzdorff, Heliodoro Huerta, Robert Andrade, and Gil Moyers.
Rockledge, Florida-based PIRTEK is the world's leading service provider of ETA 1 Hour On-Site Hose Replacement. PIRTEK offers a 24 hour, 7 day service that serves almost every facet of industry including construction, manufacturing, transportation, agriculture and engineering among others. When an equipment breakdown occurs, it often results in costly delays in time and labor before the proper replacement hose is located and installed but PIRTEK vans carry the component parts necessary to manufacture hose assemblies on site. Hose and fittings can also be purchased over-the-counter at PIRTEK's national network of service centers that serve as home bases to its mobile fleet. There are nearly 40 PIRTEK service centers nationwide and over 170 PIRTEK mobile service vans serving major metropolitan markets throughout the country.
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