The trolley runs on rails on top of the bridge girders. Dynamic: a method of controlling crane motor speeds when in the overhauling condition to provide a retarding force. Hoist Chain – The load bearing chain in a hoist. On the other hand, a crane can move in two or three dimensions. Factories with many air tools might find air power more convenient.
70 and Specification No. The hoist attaches to a trolley on a single rail that follows a path around the facility in an oval or snaking path.
Rotating Axle: An axle which rotates with a wheel. Motor Driven Electric Trolley: A machinery unit that runs along the top or the underside of a bridge beam by an electric motor.
Foundation: Free Standing jib cranes require that a special foundation, usually of concrete and steel, be used to support the crane and prevent the crane from tipping over. Hand Chain Hoists: A suspended machinery unit that, by use of manual operation, is used for lifting or lowering of a freely suspended (unguided) load and uses chain as its lifting medium. Both hoists and cranes are used to raise and lower loads. Strength, Average Ultimate: The average tensile force per unite of cross sectional are required to rupture the material as determined by test. Wheel Base: The distance from center to center of the outermost wheels.
Electric Chain Hoists: A suspended machinery unit that is powered by electrically driven motors and is used to lift or lower a freely suspended (unguided) load, using chain as its lifting medium. Air Wire Rope Hoists: An air driven machinery unit, utilizing wire as its lifting medium, and used for the lifting and lowering of a freely suspended (unguided) load.
Dynamic Lowering: A method of control by which the hoist motor is connected in the lower direction, that when it is over-hauled by the load, it acts as a generator and forces current either through the resistor or back into the life.
Load Suspension Parts: The load suspension parts of the hoist are the means of suspension (hook or lug), the structure or housing which supports the drum or load sprocket, the drum or load sprocket, the rope or load chain, the sheaves or sprockets, and the load block or hook.
Torsion Box Girder: Girder in which the trolley rail is located over one web. Bridge Conductors: The electrical conductors located along the bridge structure of a crane to provide power to the trolley and hoisting machineries.
Below, we set the record straight about what each of these devices does, and how they work together to assist in your next project. Chain Guide: A means to guide the hoist load chain at the load sprocket. Crane vs. Hoist: What’s the Difference? Since it minimizes the free height and the approach of the hook, it has a maximum space to perform other types of operations under your chain hoist crane.
K.S.I: Kips per square inch, measurement of stress intensity. It cannot move in any other direction like moving horizontally. Wall Crane: A crane having a jib with or without trolley and supported from a side wall or line of columns of a building. Column Supported (Full Cantilever): A Column Supported (Full Cantilever) is a jib crane where the boom is connected directly to a wall column. Welded link chain, like an anchor chain, is a series of identical metal loops attached together to form a string.
This design allows for movement of hard to budge equipment. Parts (Lines): Number of lines of rope or chain supporting the load block or hook. FOR MORE INFORMATION: visit the pages of selected advertisers… Thank you.
suspend from a beam or move along a rail. Cross Shaft: The shaft extending across the bridge used to transmit torque from motor to bridge drive wheels.
The double girder bridge crane is considered top running when the bridge girders ride on the top of the runway beams and can hold between 10 ton and 160 ton. Primary Upper-limit Device: The primary upper-limit device is the first limit device that will be activated to control the upper limit of travel of the load block when a hoist is equipped with more than one upper-limit device.
Lifting Devices: Buckets, magnets, grab and other supplemental devices, the weight of which is to be considered part of the rated load, used for ease in handling certain types of loads.
Magnetic Control: A means of controlling direction and speed by using magnetic contactors and relays. Hoists are situated on the primary horizontal beam of the crane, called the bridge girder.
Generally, when choose or use double hoist crane, we usually consider it with one electric hoist, while in some specific situation, which need two electric hoists hoisting together, then the double hoist crane should be equipped with two electric hoists. Overhead cranes suspend from a beam or move along a rail.
Counter-Torque Braking: A method of speed control by which the motor is reversed to develop power to the opposite direction. Column Supported (Tie Rod): A Column Supported (Tie Rod) Jib Crane is a jib crane that is supported by a wall column and has an additional tie rod connected to the boom and is designed to allow for 180 degrees of rotation. Elevators are the perfect machine for transporting loads vertically, but in no other direction (unlike a crane’s functionality). Hand Geared: The operation of the bridge, hoist, or trolley of a crane by the manual use of chain and gear without electric power.
Horizontal movement of loads is not possible with hoists. Side lifter crane
Exposed: Capable or being contacted inadvertently. 3.A hoist can only move loads vertically while a crane can move loads vertically and horizontally. Bridge: The main travelling structure of the crane which spans the width of the bay. Explosion Proof: Equipment designed in accordance with existing codes and standards such that it will operate in a specified hazardous environment without causing an explosion.
Find overhead cranes and hoists that you need to be more productive and safe at work. Mill Duty Crane: Service classification covered by AISE Standard No. The bridge consists of two end trucks and one or two bridge girders. An elevator is probably the most well-known hoist. HMI only rates hoists, and not the entire crane.
Side Pull: The component of the hoist pull acting horizontally when the hoist lines are not operated vertically. The power supply cable direction: on both ends of the single beam, respectively power supply to the two hoists, or power supply directly by safety slide wire. Rope: A wire rope, unless otherwise specified.
Cushioned Start: An electrical or mechanical method for reducing the rate of acceleration of a travel motion.
Single Leg: A Single Leg Gantry Crane is a crane that is designed to have one ‘leg’ of the crane support an end of the bridge while the other end is supported by an end truck that runs along an elevated rail. Anchor Bolt Load: The total amount of force that is applied to each supporting anchor bolt in a jib crane; usually measured in kips.
Regulated Speed: A function which tends to maintain constant motor speed for any load for a given speed setting of the controller. An elevator is probably the most well-known hoist.
You may also see CMAA abbreviated as MHI, which refers to CMAA’s affiliate, Material Handling Industry. Cranes vs. Forklifts: How Do They Compare.
Hook: The attachment portion of the hoist or lifter where the load is attached directly or through a below the hook device or sling.
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