The original parameters of the mine have been upgraded to improve safety and efficiency. (1) The self-weight of the cage, including the rope loop and other components, is 3960 kg, with a maximum load capacity of 3300 kg. This includes: the mine car weight of 600 kg, ore weight of 1800 kg, and an occupant load of 12 people totaling 900 kg. (2) The lifting wire rope specification is 18@7-34-170 steel wire, with a total cross-sectional area of 478.72 mm², a suspension length of 300 m, and an elastic modulus of 14.3 N/cm.
The cage is designed to be accurately received by the receiving device even when carrying the maximum rated load and at normal crawling speed, ensuring smooth entry and exit for the mine car. In the case of a light load (empty tank with one person), the cage should be able to buffer when it falls onto the receiving device at over-discharge speed. According to the requirements in Execution Note 6 of the Coal Mine Improvement Design Code, the buffer deceleration must be greater than 1g when lifting materials (heavy tank), and less than 5g for light tanks (with one person).
The design parameters for the bottom hole cage of the auxiliary shaft at the city coal mine are as follows: claw length of 270 mm, cage claw size of 60 mm, side middle distance of 170 mm, spring total stiffness of 1197 N/mm, spring preload of 90 kN, and a claw buffer limit stroke of 169.7 mm. The bearing capacity is calculated using the formula: Fc = 170cosA(9163 + 1702KsinA) / (2102 + y²). Substituting the actual parameters, the maximum bearing force is 117 kN, the force point is located at 110 mm, the average braking force is 107 kN, and the maximum deceleration of the empty tank is 3.06g, while the speed is 2.8g. From the equation V² = 2as = 2ay, the minimum critical speed of the tank cans is 3.05 m/s above the claws. For the heavy tank, the average deceleration is 1.508g, and the minimum critical speed through the claws is 2.23 m/s.
A 24-test simulation was conducted under the worst-case conditions for the empty tank at maximum deceleration.
**Experiment Method:**
(1) Remove the 2 m/s speed protection near the wellhead.
(2) Move the upper wellhead over-winding switch to the tank cage and verify its reliability.
(3) Confirm the speed measuring generator; the speed measuring voltage is 215V at 6.7 m/s.
(4) Set and mark the relative position of the hoist drum when setting the claws of the bottom hole cage, allowing the driver to brake accurately.
(5) Conduct animal testing using a live goat weighing approximately 18 kg inside the tank.
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