Single rope grab bucket opening and closing is mainly elastic elements car-riage and lock with exercise etc. During grabbing material, the open grab will fall upon materials, the steelcable drios to make sliding mechanism slide down, due to the effect of springs mechanism, the grab fouches the hook, then the driver lifts the sliding mechanism to lift lower separator and close jaw. During unloading materials, the filled grab is transferred to material accumulation or above ground, the steel cable drops to make the sliding mechanism fall for a distance and pressure on the grab from hook will disappear, due to the effect of spring on head, the grab will tum to go off hook, the driver re-lifts and the jaw will open due to effects of lower separator and material dead load.

Henan Mine Crane could arrange engineer to do supervision of installation, make the load test, do commissioning, training of the buyer's workers, the buyer should be responsible for each of our technician’s accommodation, meals, round-trip tickets, travel expenses and self-security. The engineer’ salary is USD100.00 per day abroad.

1. Quality problems of products sold by our company will be solved as per the “three guarantees” system of our company by the “three guarantees” service team;

2. Related personnel will be sent to the site immediately after receiving quality complaints (by call, letter or oral notice) from clients;

3. Personnel involved in after-sales service shall be serious and considerate in handling the problem to make clients care-free;

4. In addition to solve quality problems, personnel involved in after-sales service shall train clients, answer their technical inquiries and related questions free of charge;

5. Related cost for products with quality problem will be shouldered by our company. Our company charges for quality problems caused by clients (or problems after the warranty term), but the charge will not be higher than the expense (or cost);