LB10t explosion-proof electric single beam crane, explosion-proof truss, explosion-proof hoist and explosion-proof crane

Safety performance description of LB explosion proof electric single beam bridge crane
1. Mechanical explosion-proof measures:
1.1. The hook head of the hook is coated with stainless steel or hot sprayed copper to prevent sparks from friction with the spreader and wire rope, which belongs to class C explosion-proof.
1.2. A copper plate is attached at the rope outlet of the hook to prevent sparks caused by the friction of the wire rope.
1.3. Power supply by rubber sheathed flame retardant cable to prevent sparks from friction with track.
1.4. The crane has grounding measures.
1.5. The collision wheel of travel switch and limit switch is made of copper to prevent sparks from collision.
2. Brake system
2.1 the explosion-proof motor of this series of electric hoist is equipped with brake, which can stop the explosion-proof electric hoist in a short time when the motor is powered off. The shell material of explosion-proof motor for hoisting and operation is HT200 high-grade cast iron. After processing, 1.5MPa water pressure test was carried out for one minute, and 4220 arc pressure resistant terminals were used in the junction box.
2.2. The electric hoist is designed with the first brake and the second brake, and the common motor brake. When the motor brake fails, the hoist is also designed with a mechanical brake device, and the drum is set with a sliding speed to open the mechanical brake device, so as to ensure the safety of lifting objects,
3. Electrical safety description
The flameproof electric control box is designed to avoid spark leakage during the use of electrical appliances. Lifting limit protection:
The lifting mechanism is equipped with a lifting limit switch, which can automatically cut off the power supply of the lifting mechanism when the spreader rises to the limit position. The traveling mechanism of crane is equipped with travel limit switches at both ends as travel limit protection. The crane is equipped with overload protector. When the lifting capacity exceeds the rated load, it will sound to warn.
The main power circuit is equipped with automatic air switch as the short circuit protection of the crane; The control circuit is equipped with small capacity automatic air switch as short circuit protection.
Loss of voltage protection
The circuit structure has the function of voltage loss protection. When the power supply is restored after the power failure, the crane can be re operated only by pressing the start button, which eliminates the possibility of self operation when the crane is powered on.
Emergency power off switch
The crane is equipped with a red mushroom head type rotary reset emergency power-off switch, which is used to quickly cut off the main power supply and control circuit of the crane in case of emergency. The emergency power-off switch shall be installed at the place convenient for personnel operation.
Travel limit
The lifting mechanism is equipped with a fire break limiter for rising and falling, which is used as a limit switch for the lifting range of the lifting mechanism, and also has a protective effect against the adhesion of the controller.
The crane mechanism is equipped with a running limit limiter. It consists of a travel limit switch and a safety ruler. The travel limit switch is installed on the crane, and the safety ruler is installed on the rail beam or wall and does not hinder the operation of the crane, so as to ensure that the crane operates within a safe range.
All limit switches and travel switches are flameproof.
Open phase, wrong phase, over voltage and under voltage protection
The integrated protector in the crane circuit system has the protection functions of open phase, wrong phase, over-voltage and under voltage. When the above four situations occur, it will automatically cut off the main power supply of the crane to prevent personal injury and equipment damage.
Grounding
The metal mechanism on the crane, the metal shell and pipe groove of all electrical equipment, and the low-voltage side of the transformer are provided with reliable grounding, and the total grounding resistance is ≤ 4 Ω, It is allowed to use the crane track as the grounding wire. The insulation resistance of crane to ground at normal temperature shall not be less than 1m Ω( This value is the measurement value of 500Vmegohmmeter at room temperature).