With the comprehensive implementation of intelligent mines, the cage serves as the core lifting and lowering vehicle for coal and non-ferrous metal mines, undertaking the task of transporting personnel, ore, and equipment up and down. The power supply for its onboard monitoring, lighting, and communication equipment is continuously stable, directly determining the safety production and mining efficiency in the underground environment. Currently, in domestic deep mine mines, cages generally adopt three power supply schemes: cable dragging, sliding contact lines, and manual replacement of batteries. However, under extreme working conditions such as high methane content, high dust, water leakage, and continuous vibration underground, traditional contact power supply has long faced three major problems of safety, production capacity, and operation maintenance, becoming a core obstacle for the intelligent upgrade of mines.

The drawbacks of the traditional power supply mode are prominently manifested as follows:

Firstly, the power cables are constantly subjected to repeated stretching and friction, causing the outer protective sheath to easily break and leak electricity. Frequent bending and fatigue lead to wire breakage. A single cable replacement requires the entire line to be shut down for more than 2 hours, directly resulting in a loss of 10,000-ton production capacity. The friction caused by damaged cables generates electric sparks, posing a significant safety hazard of explosion in the gas-accumulated wellbore.

Secondly, the metal electrodes of the sliding contact lines are exposed. The coal dust and continuous water dripping in the underground continuously adhere and oxidize them, causing the contact resistance to sharply increase and frequent power outages. Maintenance personnel need to perform grinding and cleaning in the high-altitude wellbore, and the risk of falling into the well or being hit by falling objects is extremely high.

Thirdly, the manual replacement mode of batteries is costly in terms of manpower. The large-capacity batteries are cumbersome to disassemble and assemble, and the underground supporting storage occupies a large amount of space. At the same time, the braking stop position error of the skip can reach 100mm, and the contact-type charging connection requires strict accuracy, which is prone to interruption of charging energy. The loss of power to the underground monitoring equipment will result in the loss of disaster early warning capability.

For the harsh working conditions specific to mine cage buckets, Yicheng Space-Time has launched a complete set of 600W/900W/1200W wireless charging equipment specifically for mine cage buckets. Relying on its self-developed magnetic coupling resonance technology, it eliminates the risk of contact sparking at the source. The product has a vertical working distance of 30–100mm when fully loaded, with the maximum X-axis offset of ±120mm and the Y-axis of ±10mm. It perfectly fits the braking and stopping errors of the cage buckets and can achieve stable charging without high-precision alignment; the full-load transmission efficiency is ≥80%, supporting a 20A constant current and constant voltage output, equipped with dual communication interfaces of CAN/485, and compatible with mine upper computers and underground PLC dispatching systems. The entire equipment has IP67 waterproof and dustproof performance, with a working temperature range of -40℃ to +60℃, capable of withstanding underground dampness, dust, and continuous vibration environments, without exposed conductive metals, and completely avoiding the risk of electric sparks igniting methane.

The four core advantages of the parity-time space elevator wireless charging system for mining meet the urgent needs of the industry:

1. Intrinsically safe explosion-proof design: Fully encapsulated explosion-proof housing, no exposed contacts, no discharge sparks during high current transmission, meeting the usage standards for explosive gases and dust environments in coal mines and non-coal mines; the grounding structure of the entire machine is complete, eliminating the risk of static electricity accumulation.

2. Ultra-large offset tolerance, suitable for shaft conditions: A 30–100mm wide adaptation range in the Z-axis, and a maximum 120mm offset on the X-axis still allows for full-load output. The elevator can start and stop normally, and make small docking deviations without interrupting charging, eliminating the need for upgrading the lifting and braking system.

3. Intermittent fragmented charging, zero downtime for increased production: The elevator automatically approaches and charges during the waiting period for loading and unloading, supporting 485/CAN commands and dual start-up modes of approaching and charging. No separate downtime for charging is required, with the equipment's maximum full-load transmission efficiency reaching 87%, and low charging loss. The system is equipped with 2.4G radio frequency communication, real-time uploading of voltage, current, temperature, and fault codes, and remote monitoring by the underground dispatch center. The device has multiple levels of protection against overcurrent, overvoltage, and 82℃ high temperature, automatically reducing load and shutting down in case of abnormalities.

4. Full-cycle maintenance-free cost reduction: No carbon brushes, sliding contact blocks, or plug-in connectors, which are prone to damage. The transmitter and receiver have an average fault-free operation time of over 50,000 hours. The transmitter and receiver use standardized 300×300mm shells, with surface/embedded dual installation schemes, allowing for quick installation and transformation of new and old elevators without large-scale equipment dismantling. The transformation period is short. The entire set of equipment is guaranteed for one year, and the 400 national customer service hotline provides rapid response.

After the large-scale coal mine with an annual production capacity of tens of millions of tons in China implemented the wireless charging project for the space-time bucket elevator, the transformation data is clearly visible: the number of stoppages due to cable replacement throughout the year has decreased by 90%, high-risk maintenance operations in the shaft have been significantly reduced, and the overall operation and maintenance costs have decreased by 70% in 5 years; there is no risk of electric sparks, and the frequency of safety inspection and rectification underground has been significantly reduced. The entire system is compatible with lithium battery and lead-acid storage power supplies for bucket elevators, suitable for new smart mines and intelligent transformation projects of existing mines, and can be used in conjunction with cage, underground track locomotives, and underground inspection robots.

At present, the safety control standards for mines are continuously tightened, and the traditional contact-type power supply safety shortcomings can no longer meet the long-term operational needs of modern mines. Yuzheng Space relies on its 180W-6000W full-power industrial wireless charging product line, deeply specializing in the field of mine explosion-proof wireless charging. With high fault tolerance, explosion-proof, and long-life bucket elevator-specific solutions, it has broken through the last link of unmanned power supply for underground lifting equipment. In the future, Yuzheng Space will continue to iterate on large-power mine explosion-proof wireless charging modules, enabling safe, efficient, and unmanned mining in deep mines.