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The Stewart Glapat Model Conveyor is a telescoping cantilevered type of conveyor with each boom section telescoping into the boom section immediately to the rear and all booms retracting within the fixed main frame section. Each telescoping boom is chain driven on each side to provide uniform force for retraction and extension. The main frame section and booms are of all welded steel construction with a slider bed for belt support. The main section and boom form a rigid, box type frame capable of withstanding, without bending, racking, distortion or sidesway, all loads imposed during normal operation. No part of the working surface of the conveyor extends above the carrying surface of the belt and the forward ends of each boom section have been smoothed to prevent snagging of the belt or belt lacing.
The fixed main section includes the belt driving system, belt take-up pulleys, system boom extension drive, master control panel, power supply, cable connections, cable reel for extension and guide rails and rollers for the mating extending boom. The side frames provide support, adequately reinforced, for the drive pulley, belt take-up, master control panel, guide rails, rollers and drive sprockets. The guide rails are cold rolled bars. The boom rollers are hardened steel cam rollers that can be re-lubricated. The main frame has a hold-down system designed for secure anchoring to a dock.
Each telescoping boom is provided on each side and bottom with cold roll steel guide rails, side thrust rollers and heavy duty boom support rollers for guidance and support when telescoping into the mating booms. The guide rails and rollers are sized and spaced to prevent side-sway and tipping of the boom under imposed loads. Steel drive sprockets are provided on each side. The most forward extendible section of the boom is provided with the head pulley at the front end, a safety plate on the first boom, and boom and belt controls. Front and rear pulleys are provided for proper belt guidance on each telescoping boom.
The conveyor belt is SB-120-COS. The belt is 24 inches wide and is installed with the take-ups at approximately the mid-position of their adjustment. The operating belt tension is maintained constant, regardless of the length of extension of the telescoping booms. The belt system is free of all irregularities which would result in excessive belt wear or might damage the product. The belt lacing is a corrosion-resistant stainless steel, pin-belt lacing type. No sharp protrusions extend above or below the surface of the belt after the ends are joined.
All pulleys are single piece, made of W.M.T. tubing with steel end hub discs attached to the rim by continuous weldments. All pulley shafts are cold rolled steel. All pulleys are mounted to rotate in re-lubricatable, self-aligning, flange type bearings and are mounted in the frame of the boom and main sections of the Conveyor. The pulleys and bearings are readily accessible from the outside and easy to remove and replace. [ALWAYS LOCK OUT THE POWER OF THE UNIT WHEN REPLACING PULLEYS OR ROLLERS.] The conveyor drive pulley is furnished with rubber lagging vulcanized to the pulley face. The rubber compound used in the lagging drive pulley is in accordance with ASTM-D-2000. The lagging has a uniform thickness of 3/8 inch, and a durometer hardness of 60, plus or minus 5. The bond between the lagging and the pulley is complete and secure at all points to ensure non-separation from the pulley, or cracking of the lagging, during normal conveyor operation. The surface of the lagging has a grooved finish. The drive pulley is mounted in pillow block type, self-aligning, ball bearings on the fixed main frame section of the conveyor. The pulley system maintains the belt in correct alignment and operating tension during all retractions and extensions of the conveyor. Adjustments are not necessary after the initial pulley adjustments have been made, unless belt tracking becomes a problem.
Return belt rollers are provided in the main frame and telescoping boom sections to support the belt return, prevent belt sag, and reduce friction of the moving belt. The rollers are constructed of W.M.T. tubing with press-fitted hexagon shaft roller bearings. The rollers, accessible and easily removable for replacement, are free rolling and are mounted in sealed, lubricated for life, bearings. The hex shafts of every roller are accessible from the outside of the frames. You do not have to reach under the machine to check for bearing noise.
Vertical belt guide rollers are used in the return belt path to assist in proper belt tracking. These rollers are installed in each boom.
Flange bearings are self-aligning, with no reduction in the size of the shaft at the bearing. The bearings have the inner race extended and secured with two set screws in tapped holes spaced 45 degrees apart. The outer and inner races of the bearings are each of high carbon steel, hardened and ground. The bearings are provided with effective seals to retain the lubricant and exclude all dirt and foreign matter. All bearing set screws are readily accessible for maintenance. You never have to reach under the machine to check for bearing noise. Special tools are not required for maintenance or removal of the flange bearings.
Ball bearings used on the conveyor conform to specification FF-B-171, both prelubricated, and re-lubricatable bearings are used throughout the Conveyor.
Conveyor belt tension screw take-ups are rugged construction with ball bearings, steel guides and heavy adjusting screws. The take-ups are the fixed screw type, with screws arranged to be operated independently by hand or air wrench. The take-ups travel 12 and 6 inches. (See drawings)
Sprockets used in the Conveyor are steel with cut teeth, in accordance with ANSI-B-29-1, Type A and Type B, for tooth form. All drive sprockets are keyed to the shaft and further secured with two set screws, one over the key and one 90 degrees from the key.
NEVER TOUCH A MOVING SPROCKET.
The roller chain is in accordance with ANSI Specification B29.1 and is compatible to the motor horsepower and torque requirements. RC-50, -60, -80 chain may be used on your conveyor depending on its requirements. The free-end of the roller chain are joined with a removable connecting link.
NEVER TOUCH A MOVING CHAIN.
The sprockets and chain drive are enclosed with removable guards of sheet metal. Each side of the guard, when closed, is secured with 1/4-20 hex bolt. THE MACHINE MUST HAVE ALL GUARDS SECURELY ATTACHED FOR SAFE OPERATION. All exposed moving parts of the Conveyor such as pulleys and rollers, are effectively guarded. A safety pressure plate located on the leading end of the conveyor will stop boom movement when depressed.
All moving parts of the Conveyor are provided with adequate lubrication. Most parts are easily serviced from outside the Conveyor. The rear guard must be removed for certain fittings. All lubrication fittings are serviceable with standard lubricating equipment. Gear cases are mounted so gears will receive adequate lubrication. NEVER SERVICE PARTS INSIDE THE CONVEYOR UNLESS THE ELECTRICAL POWER IS SHUT OFF AND LOCKED OUT.
The conveyor complies with the safety requirements specified in the American National Standards Institute Standard B20.1.
All metal parts of the Conveyor, except parts such as conveyor pulley faces, roller shafts, and those which conform to the ANSI safety color code, are painted PPG Safety Blue, semi-gloss enamel, per color chip No. 97-603, or per customer request.All items or areas requiring color coding for safety, in accordance with OSHA Spec. 1910-144 are painted with semi-gloss enamel in conformance with TT-E-529, Class A or B. The finish coat is Federal Safety Orange, color per Rust-Oleum color chip No. 956, or per customer specification.
