无码中文人妻视频2019丨狂野欧美性猛交免费视频丨欧美野性肉体狂欢大派对丨人人妻人人澡人人爽人人精品浪潮丨亚洲精品色情app在线下载观看

Skip to content Skip to navigation

The United States has about 160,000 miles of operational railroads, mostly composed of 39-foot rail segments welded end to end. Unless these connections and the rail surfaces are perfectly smooth, the rails could wear prematurely, affecting the comfort of the ride, impacting safety and increasing maintenance costs. To avoid such problems, railway maintenance workers use massive track grinders, guided by precision electric linear actuators.

How a rail grinder works

Railroad track grinders remove irregularities and restore the shape of worn railroad tracks, enhancing their surface smoothness. Their core component is a grinding wheel that contacts the rail as the grinder self-propels along the tracks. As it does, the grinding wheels rotate at high speeds to abrade corrugation, surface defects, fatigue cracks and other imperfections from the rail surface.

To maintain optimal contact between the wheel and the track, sensors mounted on the equipment frame scan the tracks for variations and send their readings to a control unit. The control unit then signals electric linear actuators to adjust grinding pressure based on variations in wear level.

Going electric

Traditionally, rail grinder manufacturers used hydraulic cylinders to provide these adjustments, primarily because of the high force needed and high duty cycle. But as rail ridership increased and with it the wear on the rail lines, at least one major, global rail grinder manufacturer has concluded that hydraulic cylinders did not have enough accuracy or stability to meet their expanding needs.

After extensive searching, they concluded that electric actuators could handle their loads with higher accuracy and greater stability. Electric actuators allow operators to adjust the grinding intensity and angle to match the contours of the track. Such precision is crucial for matching rail grinding to the correct profile for maximum safety and efficiency.

Possessing many of the same unique design characteristics that made hydraulic and pneumatic cylinders popular, electric actuators such as the Thomson T130 (pictured) benefit from cleaner, simpler and more energy efficient power transmission. They are also much easier to integrate with modern programmable controls, have greater accuracy and are less noisy.

After evaluating the offerings of several electric actuator vendors, the rail company chose to partner with Thomson, a leading provider of linear motion products. With the help of the Thomson online configuration tool and their engineers, they concluded that the T130 electric precision linear actuator would best meet their overall requirements for load, accuracy, stability and controllability.

Getting the thrust

Thomson has designed its T series precision linear actuators for applications requiring powerful performance over a long lifetime and thus, they are ideal replacements for cumbersome hydraulic cylinders. The rail grinding application required two tons of thrust, which, with its six-ton capability, the T130 met with ease.

Achieving accuracy

Thomson T130 precision linear actuators offer positional repeatability of 0.05 mm, which is higher than what is possible with hydraulic cylinders. With such high accuracy, the OEM can target grinding more specifically without introducing unnecessary wear. The result is smooth motion with minimal impact on life and durability.

Enabling stability

Loosened by aging, the seals of hydraulic cylinders wear out and begin to rotate. Because hydraulic cylinders are optimized for linear, and not rotational, loads, cylinder seal wear disturbs the alignment between the actuator piston rod and the grinding wheel, leading to binding or jamming of the piston and wobbling of the grinding wheel. The Thomson T130 actuator eliminates rotational problems with designed-in anti-rotation functionality. It uses an internal square guide rail nut, which prevents the extension tube from rotating if it is not attached to any load.

Smarter operation

In addition to exceeding requirements for load, accuracy and stability, the T130 has shown many other advantages for rail grinding. Embedded feedback from the servo motor enables participation in automation schemes, which could extend operation without operator intervention. In addition to storing and forwarding height measurements, it also provides position feedback to the actuator shaft, making it even easier to program and adjust. The sensors also collect and communicate data on wheel wear rate, rail condition and grind quality, all of which could drive further height and pressure adjustments or preventative maintenance.

Thomson has invested significant expertise and development in simple, but high-performance, precision linear actuators. IP65 protection, a robust design and the use of high-quality components make them suitable for usage in harsh environments.

Simpler and cleaner

Where hydraulic cylinders require fluid reservoirs, pumping and piping, electric actuators are plug-and-play, needing only a power and data cable. As opposed to fluid leaks and constant maintenance, electric actuators are clean and virtually maintenance-free, only requiring some lubrication. This extends the life of the rail grinder and reduces the need for costly replacements.

The right touch

With about 13 percent of the world’s 1.4 million miles of railroads, the United States has more miles of track than any other country. Only a small fraction of its railroad are high speed, exceeding 150 mph. This is expanding slowly but doesn’t impact the contact between the train wheels. The smoother that contact, the better it will be for riders as well as rail operators. Electric actuators will play a key role in optimizing the performance of the rail grinders, which will remain essential for quality rail travel.

back to top 主站蜘蛛池模板: 国产精品特级露脸av毛片| 高潮爽死抽搐白浆gif视频| 亚洲精品国产品国语在线app| 伊人精品无码一区二区三区电影| 色噜噜亚洲男人的天堂| 欧美肥富婆丰满xxxxx| 亚洲精品无码精品mv在线观看| 狠色狠色狠狠色综合久久| 很黄很色60分钟在线观看| 欧洲免费一区二区三区视频| 久久人妻精品国产| 和岳每晚弄的高潮嗷嗷叫视频| 伊人狼人大焦香久久网| 在线看片免费人成视频影院看| 女人裸体做爰免费视频| 中国杭州少妇xxxx做受| 国产成人无码av在线播放无广告 | 亚洲制服丝袜精品久久| 色噜噜狠狠色综合av| 欧美色欧美亚洲另类二区| 疯狂做受xxxx高潮视频免费| 国产国拍亚洲精品| 无码专区视频中文字幕| 成人国产三级在线观看| 国产亚洲精品一区二区在线观看| 国产精品国产亚洲区艳妇糸列短篇| 久久久久成人片免费观看| 人妻无码不卡中文字幕系列 | 欧洲专线一区二区三区| 精品国模一区二区三区| 亚洲欧洲日韩欧美网站| 国产精品久aaaaa片| 久久久精品人妻无码专区不卡| 人妻无码中文专区久久五月婷| 麻豆乱码国产一区二区三区| 久久欧美一区二区三区性牲奴| 亚洲欧美日韩综合久久久久| 国产亚av手机在线观看| 男人用嘴添女人下身免费视频| 久久久久国产精品人妻照片| 无码av专区丝袜专区|