Machine guard devices

Safety guards Devices to protect operators from moving machine parts. 

In addition to the machine guarding, the control system should be interlocked with an electronically monitored failsafe system. The control software should have an awareness of the position and action of all moving parts and measurement devices. Therefore, if an unplanned incident or out-of-protocol action does occur, the system will take action or stop action to minimize the likelihood of additional safety hazards. In some cases, as with system calibration or super user access, graded access levels can be custom-built into the design for specialized and infrequent operations. 

Polycyclohexylenedimethylene Ethylene Terephthalate Thermoplastic polymer of cyclohexylene-dimethylenediol, ethylene glycol, and terephthalic acid. Has good clarity, stiffness, hardness, and low-temperature toughness. Processed by injection and blow-molding and extrusion. Used in containers for cosmetics and foods, packaging film, medical devices, machine guards, and toys. Also called PETG. 

A machinery protective device (e.g., barrier, shield, etc.) that incorporates an adjustable element, and after being adjusted, remains in place during a particular operation. For example, the guard on a circular table saw, which is adjusted for the wood being cut. See also Machine Guarding. 

Machine guards are examples of safety devices. They prevent operators from getting into a hazardous area of a machine. Fences, interlocks, shielding, and enclosures are all forms of safety devices. 

Safeguards include guards, devices, distance, or location. Safeguards for machines fall into two major groups mechanical power transmission safeguards, and point-of-operation safeguards. 

Guards and guard devices may not provide enough protection for all the operations and activities involved in the use, maintenance, cleaning and repair of machines and tools. Several safeguarding procedures will help prevent accidents from occurring. Remember, procedures do not remove hazards. 

Inspections Machines should have regularly scheduled inspections to detect potential problems early. Inspections should include regular checks and tests of guards and guard devices. Work orders should correct hazardous conditions or inadequate safeguards before returning a machine to use. 

Machine Guard Any piece of equipment or device on a machine intended to reduce or eliminate the chance of injury through the use of that machine. 

Job/task instruction technique Lock out or tag out Machine guarding Materials handling and storage Methane control Personal protective equipment Personnel hoisting Rules and regulations Safety meetings Self-rescue devices Shafts Signaling Ventilation. 

Be interlocked with other guarding devices or have fixed guards to prevent human access to a machine s danger zone except through the sensing field... 

Incorporate safety devices. Use protective safety methods or devices. In general, safety devices are static interveners. Examples include physical barriers machine guards barricades revetments around explosives storage facilities guardrails toe boards safety eyewear hearing protectors... 

If the hazard cannot be eliminated, contact might be prevented by using enclosures, machine guards, worker booths or similar devices. 

Interlock A device that interacts with another device or mechanism to govern succeeding operations. For example, an interlocked machine guard will prevent the machine from operating unless the guard is in its proper place. An interlock on an elevator door will prevent the car from moving unless the door is properly... 

Small compressors will have motor overheat protection adjacent to the hermetic shell or built into the winding (see Section 4.8) and larger motors will have contactor-starters with overcurrent devices. Overheat protection is also fitted on many machines, to guard against high motor winding, cylinder head or oil temperatures. These usually take the form of thermistor detectors, connected to stop the motor. 

Orange a. Offshore survival or evacuation craft and personnel floatation devices. b. Identification of the hazardous parts of machines. c. Marking of the guards for the hazardous parts of machine operations. d. Danger signs. e. Relief valve identification or specialized isolation equipment, e. Directional wind socks. 

Normally a guard is installed on a moving part of the machine, which acts as a barrier to prevent the entry of any part of the human body in the hazardous area. It is also possible that a safety device is installed that prevents or interrupts the operation if part of the operator s body is in a hazardous area or requires its withdrawal prior to machine operation. The guard or safety device itself must not constitute a hazard, must be safe, low maintenance, easy-to-use, automatically controlled, or fixed on the machines. There are different types of guards and safety devices available according to the design and demands of machines. 

Electric field transducers can also be used. They generate a capacitive field in a hazard area. Any grounded object in the field can he detected. Operators working in that area are grounded and can he sensed by this method to stop the machine before its activation. These are different guards and safety devices that are normally used to avoid mechanical hazards. 

Detailed information is provided on safety procedures and safety devices for machine operations, including guards, doors, emergency stops, light curtains, safety bars, and hydraulic and compressed air safety. 

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