What is an anti two block?
Anti two-block or ATB systems help prevent the ball block from contacting the boom tip. This is called two-blocking and can cause injury or death as well as damage to the crane, load line and ball or block. The Altec ATB system consists of a load line weight suspended from a chain, connected to a boom tip ATB switch.
How do I stop two blocks?
Two-blocking can be prevented in cranes by installing a safety device called the anti-two-blocking system. In fact, the American National Standards for Mobile and Locomotive Cranes (ASME) have made it compulsory for cranes manufactured after February 1992, to have an anti-two-blocking system installed.
What is a ATB switch?
Anti-two block switches The wired Ultimate ATB switch offers added protection against two-blocking situations for crane operators and ground personnel, such as a smaller footprint on boom heads, easy cable replacement, no-hassle mounting flexibility, and less cable wear.
What is a2b switch?
Over hoist limit switch is a crane safety device mounted on the hoist/crane head. The sensor activates when the hook block approaches close to the head pulley block avoiding a collision leading to an accident.
What does the term two blocked mean?
From nautical terminology for a ship’s rigging or crane rigging in which two blocks are locked together, stopping the line.
What is a headache ball?
Headache Balls, also known as overhaul hook balls, are very important devices used in a single line hoist wire rope with the purpose to add weight and help the line to drop down after coming up the crane boom and going over the sheave.
What does two block mean on a crane?
Two-blocking occurs when the operator extends the boom on a crane without letting out sufficient slack in the cable. As a result, the stabilizing weight, called the headache ball, will be popped off by the extending boom.
What is two block crane?
What is a a2b system?
A2B is a high bandwidth, bidirectional, digital audio bus. A2B is capable of transporting I2S/TDM/PDM data and I2C control information, along with clock and power, using a single, 2-wire UTP cable over distances up to 15 m between nodes and 40 m over the entire daisy chain.
How does a hoist limit switch work?
The limit switch is operated by contact with the crane hook block. When activated, the limit switch interrupts power to the lift motor. This prevents the hook block from colliding with the cable drum, which could cause a dropped load or other unsafe situation.
What does down the block mean?
“Down the block” in this usage may indicate someone who lives several houses away, but in the same block. Or it may indicate someone who lives in the adjacent block, but I think more often the former. Compare “down the road”, meaning some distance along the same road. The term is informal.
What does two blocking a crane mean?
What is crane block?
hook blocks, often called crane blocks or crane bottom blocks, are below-the-hook crane lifting equipment designed for your specific application. Sheave configuration, capacity, special control requirements and unique reeving patterns can be incorporated to improve your industrial lifting equipment operation.
What is LMI in crane?
The Cranesmart Load Moment Indication (LMI) system (Rated Capacity Indication system) displays the crane position, capacity and crane load indication on each hook at all times during operation. The system gives both audible and visual warning in overload or 2-block conditions.
What is LMI in safety?
– Longitudinal Moment Indicator (LMI) – Measures the weight applied on the rear tyres. As the weight on the tyres decreases the LMI increases. – Rated Capacity Limiter (RCL) – Measures the weight of the lifted load and compares it against the maximum rated load for the current boom angle and boom length.
What is the block on a crane?
A Load Block is the assembly of hook, swivel, bearing, sheaves, pins and frame and is suspended by hoisting ropes or load chains. It is used to lift and move objects up to a specific lifting capacity. Visit us at our Homepage for more crane terms.
What is A2B crane?
Anti-two-block (ATB or A2B) warning systems are used to warn or prevent the crane operator from two-blocking the crane. Two-blocking is a dangerous condition where the hook block is raised until it contacts the boom tip.
How A2B technology and digital microphones enable superior performance in emerging automotive applications?
As a digital bus with daisy-chaining capability, A2B technology together with the digital MEMS microphone provide a well-suited solution for interconnecting and/or sharing multiple microphone signals demanded by audio, voice, noise cancelling, and other acoustic applications that are rapidly expanding in vehicles.