Overview
The 2JK series double-pulley mine hoist is a dual-container lifting system designed in accordance with the *Coal Mine Safety Regulations*, GB/T 20961-2007 *Single-Rope Wind-Up Mine Hoists*, and AQ 1035-2007 *Code for Safety Inspection of Single-Rope Wind-Up Mine Hoists for Coal Mines*. It is primarily used in vertical or inclined shafts in coal mines, metal mines, and non-metallic mines, where it performs critical functions such as personnel hoisting, material transport, and equipment lowering. The equipment employs a single-rope wind-up configuration with dual pulleys; the pulley diameters typically range from 2 to 3.5 meters. Steel wire ropes are wound separately around the left and right pulleys to pull the cage or bucket, enabling the dual containers to operate in reverse-synchronous mode. This configuration offers high lifting efficiency, strong transport continuity, and excellent suitability for medium-and large-scale mines.
The 2JK series hoist consists of two main components: a mechanical system and an electrical control system. The core of the mechanical system comprises a dual-pulley main shaft assembly (including a fixed pulley and a traveling pulley), a radial toothed-block hydraulic rope-adjustment clutch, a planetary reducer, a disc brake, a motor, a hydraulic station, and a depth indicator; the electrical control system includes a power cabinet, a variable-frequency cabinet, a braking cabinet, and an operator console. A typical model is the 2JK-2.5×1.2, which has a maximum static tension of 69 kN, a lifting height of up to 733 m, and a maximum lifting speed of 8.8 m/s, meeting the high-efficiency transportation requirements of medium-and large-scale mines.
Core Structure and Design Features
The drum adopts an integral or split-type construction (for underground installation) and is fabricated from high-strength Q345A steel; its surface is grooved with spiral channels made of engineering plastic to reduce wear on the steel wire rope;
The spindle and drum are connected via a flat high-torque friction joint; both ends are equipped with adjustable double-row roller bearings, providing a transmission efficiency of ≥90%.
Disc brake: rear-mounted cylinder design; braking force is provided by disc springs and driven by a hydraulic unit (response time <0.3 seconds); braking torque is ≥ three times the maximum static torque;
Supports secondary braking and electro-hydraulic proportional regulation; a safety brake is automatically engaged when power is disconnected.
Reduction gear: planetary or cylindrical gear reducers are available; the tooth surfaces feature a hardening treatment (material 20CrMnTi, carburized and quenched), ensuring smooth transmission and low noise levels;
Speed control system: Supports variable-frequency speed control (saving over 30% in energy consumption) or resistive speed control; also compatible with PLC control for remote monitoring.
Security Protection Features
Application Scenarios and Limitations
Principle
The 2JK mine hoist uses an electric motor as its power source and implements dual-pulley lifting operations through a closed-loop process comprising “power transmission—coordinated operation of the dual drums—rope-length control—safety braking”; the specific operating principle is as follows:
The motor transmits power to the high-speed shaft of the reducer via an elastic coupling; after two-stage planetary gear reduction, the passive shaft of the reducer drives the dual drum main shaft assembly to rotate. The fixed drum is rigidly connected to the main shaft, while the movable drum achieves clutch control with the main shaft through a rope-adjustment clutch;
During normal hoisting, the rope-adjustment clutch is engaged, causing the two drums to rotate synchronously; rope is discharged from the top of the fixed drum and from the bottom of the traveling drum. Through the winding and release of the steel wire rope, the two containers are hoisted synchronously in opposite directions, resulting in a hoisting efficiency more than 50% higher than that of single-drum units;
When the rope length needs to be adjusted or the position needs to be changed, safely brake and lock the fixed drum; the high-pressure oil drives the rope-adjustment clutch piston pin upward, causing the tooth block to disengage from the inner gear ring; once the free-spinning drum’s braking is released, it can be rotated independently for adjustment; after adjustment is complete, reset the clutch to mesh; the limit switches Q1 and Q2 provide interlock protection to prevent gear clash;
The variable-frequency speed regulation system achieves continuous speed regulation through sensorless vector control; the disc brake obtains braking force from a disc spring (single brake shoe pressure: 63 kN); the dual-circuit design of the hydraulic station ensures reliable switching between service braking and emergency braking; and the braking torque is provided with a threefold reserve relative to the maximum static torque;
The dual PLC control system receives signals from the shaft encoder and depth indicator, calculates the container’s position and speed in real time, and implements 17 protection functions, including over-rolling, over-speeding, and rope slack; during vertical shaft hoisting, the number of windings on the drum is limited to one layer, and in inclined shafts it does not exceed two layers, thereby complying with safety regulations.
Parameter
| technical parameter | |||||||||||||||||
| model | drum | Maximum tensile force of the steel wire rope | Maximum tension differential of the steel wire rope | Maximum lifting height or transport length | wirerope | Average improvement rate | outline dimension(L × W × H) | Nominal weight of the main unit | |||||||||
| number | diameter | width | Center-to-center distance between the two rollers | manned | Load | manned | Load | One layer of wrapping | Two-layer winding | Three-layer winding | Maximum diameter | Total fracture strength | |||||
| unit | m | kN | m | mm | kN | m/s | mm | Kg | |||||||||
| parameter | 2JK-2×1 | 2 | 2.0 | 1 | 1.09 | 44 | 61 | 40 | 40 | 312 | 427 | 672 | 24 | 396.5 | 2.5 | 7786×3032×2600 | 31247 |
| 2JK-2×1.25 | 2 | 2.0 | 1.25 | 1.34 | 44 | 61 | 40 | 40 | 273 | 549 | 857 | 24 | 396.5 | 2.5 | 7846×3032×2600 | 33285 | |
| 2JK-2.5×1.2 | 2 | 2.5 | 1.2 | 1.29 | 69 | 83 | 65 | 65 | 254 | 210 | 804 | 30 | 621 | 3 | 8265×3610×3300 | 47326 | |
| 2JK-2.5×1.5 | 2 | 2.5 | 1.5 | 1.59 | 69 | 83 | 65 | 65 | 326 | 657 | 1026 | 30 | 621 | 3 | 9008×3610×3300 | 49243 | |
| 2JK-3×1.5 | 2 | 3.0 | 1.5 | 1.59 | 100 | 135 | 90 | 90 | 282 | 553 | 873 | 36 | 900 | 3.7 | 10067×4550×2800 | 57210 | |
| 2JK-3×1.8 | 2 | 3.0 | 1.8 | 1.89 | 100 | 135 | 90 | 90 | 353 | 697 | 1090 | 36 | 900 | 3.7 | 10667×4550×2800 | 59539 | |
| 2JK-3.5×1.7 | 2 | 3.5 | 1.7 | 1.79 | 136 | 170 | 115 | 115 | 324 | 635 | / | 42 | 1230 | 4.3 | 11246×5020×3050 | 76754 | |
| 2JK-3.5×2.1 | 2 | 3.5 | 2.1 | 2.19 | 136 | 170 | 115 | 115 | 419 | 823 | / | 42 | 1230 | 4.3 | 12046×5020×3050 | 80356 | |
