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Options on New Mills or Upgrades on Used Mills
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There are any number of options/upgrades available on three roll Mills. A partial listing is given below:
- Roll Set Options:
- Manual Roll Set:
This is the simplest roll setting system. The operator turns a hand wheel, and the hand wheel screw pushes the bearing block.
The photo on the right shows a used (remanufactured) Anthony 5"x12" mill with a manual roll set.
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- Manual-Hydraulic Roll Set:
With these systems, the operator turns a hand wheel (or uses a hydraulic pump), which pushes on a hydraulic reservoir. The hydraulic fluid, in turn, pushes on a gauge and it also pushes on the bearing block.
The photo on the right shows a new Anthony 6"x14" mill which has manual hydrolic roll set, including a single hand operated hydraulic pump.
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- Electrohydraulic Roll Set:
These systems have an electrically driven hydraulic system and a control panel mounted on the mill. The KMC system has thumb knobs/gauges to control pressure at the four corners, and levers to open/close the feed roll and the apron roll.
The photo on the right shows a used (remanufactured) Lehmann 16"x40" mill which has the KMC electrohydraulic roll set system.
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- Endplate Options:
- New Anthony Mills are standard with Endplates that allow for mixing on the back two rolls (Buhler type system). An option is endplates that ride of the flat of the roll.
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- Used Day & Lehmann mills are standard with endplates that ride on the roll bevels. These endplates need to be "lapped" or fitted onto these bevels, and they do allow for mixing on the back two rolls. Options for these mills are endplates that ride on the flat of the roll, as well as "Buhler type" endplates.
The phot on the right shows a used (remanufactured) Day 5"x12" mill which has endplates that ride on the roll bevels.
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- Used Kent Mills are standard with endplates that ride on the flat of the roll. An option is "Buhler type" endplates.
The photo on the right shows a used (remanufactured) Kent 13"x32" mill which has endplates that ride on the flat of the roll.
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- Endplates that ride on the roll bevels (Day & Lehmann), and "Buhler type" endplates can be set up with stainless steel hopper plates. These form a "hopper" to increase the holding capacity of the product on the mill.
The phot on the right shows a used (remanufactured) Kent 9"x24" mill which has "Buhler type" endplates set up with stainless steel hopper plates.
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- Prewire Options:
- The majority of mills, both new and used, that are shipped from Keith Machinery, are supplied with a prewire package with control box including VFD for variable roll speed and elimination of the amperage spike at startup. Most of these packages also include braking for safety. The photo on the right shows a New Anthony 6"x14" mill with this type of prewire.
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- Prior to the introduction of VFD's, the industry standard was a prewire with a two-speed motor and a two-speed starter.
- The simplest prewire package is a single speed motor and single speed starter.
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- All of the above prewire options can be supplied as explosion proof. Keith Machinery now uses "intrinsically safe" explosion proof wiring. The photo on the right shows a New Anthony 5"x12" mill with "intrinsically safe" explosion proof prewire.
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- Safety:
- All New Anthony Mills and all used (remanufactured) mills are equipped in accordance with ANSI B177.1-1997. Additional safety items are as follows:
- Braking is the most requested safety add on. As supplied by KMC, the mill is normally operated using the start/stop buttons provided. Hitting the stop button cuts power to the motor, and the rolls "coast" to a stop. When one of the emergency stop buttons/micro switches is activated, a braking system stops the rolls much more quickly, Obviously, using the braking system for normal operation is not recommended, as this puts a real strain on the drive train of the mill. Of course, in an emergency situation, this is not a consideration.
- Mills can be supplied with additional emergency stop positions, over and above what is required in the ANSI specifications. Examples would be a knee safety bar mounted on the feed roll side of the mill, a cable system running around the top of the mill, etc...
- Mills can also be supplied with a Manual Wash-up System. In this case, the mill is cleaned with all power locked out. On lab mills, the operator can turn the rolls, manually, using the hand wheel provided. On larger mills, a ratchet driver is provided, and one person is required to turn the rolls while the operator cleans them.
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- Training, Training, Training! KMC believes that the most critical safety issue is training in general and safety training in particular. KMC believes that training classes should be held at least quarterly. These classes should include correct operating procedures, correct clean up procedures, and safety issue discussions. KMC servicemen are available to conduct such classes.
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- Roll Temperature Control:
- Mills can be supplied with thermometers installed in the water box. These thermometers measure the temperature of the outlet water from each roll.
- Mills can be supplied with thermocouples installed in the water box and remote digital temperature readouts.
- Mills can be supplied with an automatic roll temperature control system. With this type of system, the operator presets a temperature and the system keeps the roll at that temperature. Standard systems use solenoid valves. A more sophisticated system uses proportional valves, which zero in on the correct water flow to maintain the preset temperature.
- Apron Roll Speed:
- Most older USA manufactured mills came from the factory with an apron roll speed of between 275 and 330 RPM. Although there are some exceptions, almost all of these mills can be remanufactured for an apron roll speed increase of approximately 20%. This translates directly to a 20% increase in production. New Anthony mills run at these higher speeds. This is also true for mills remanufactured by Keith Machinery.
- Keith Machinery no longer supplies silent chain drives as standard on both its new Anthony and used (remanufactured) mills. The KMC standard is now a much quieter, specially designed timing belt drive.
- The final part of this equation is the incorporation of a VFD (variable frequency drive) into our electrical control package. A VFD allows for fully variable roll speed.
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The material on this site is protected under the copyright laws of the United States of America and international conventions, and is the exclusive property of Keith Machinery Corp. or any licensee. All rights reserved. © Keith Machinery Corp. 2003-2008.
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