Deep within the pitch-black mine shafts, each ascent and descent of the elevator carries the lives of the miners and the profits of the enterprise. And the cage - this "lifeline" connecting the underground and the surface - how can the lighting, communication, monitoring, and barrier devices on it provide safe and stable power supply? This has long been a "difficult problem" that has plagued the safety production of mines.

The traditional solution was to use power cables: a long cable moved up and down with the cage, delivering electricity to the auxiliary equipment. However, this "tail" was prone to wear, tear, and even breakage under frequent bending, friction, and stretching. Even if it was only slightly damaged, it could cause the equipment to lose power; if it was severely damaged, it could lead to leakage and electric shock, broken cables causing injuries, or even electrical sparks igniting methane, resulting in serious accidents. In the harsh environment of the underground, which is damp and filled with dust, the reliability of the power cables was even more problematic.

Is there a way to completely remove this dangerous "tail" from the cage?

WIRELESSPT's answer is: the wireless charging technology for the cage.

I. From Power Cables to Wireless: A Life-Saving Power Supply Revolution

The operation characteristics of the mine hoist cage are intermittent and repetitive - each time it stops at the surface or the bottom of the shaft, there is a brief stopover window. The WIRELESSPT intelligent cage wireless charging solution precisely takes advantage of this window period to achieve "stop and charge, use while moving".

The system consists of a transmitting end installed at the fixed position of the shaft frame and a receiving end integrated into the cage. When the cage is in place, the transmitting end and the receiving end automatically couple, and through the principle of magnetic resonance, they efficiently transmit electrical energy in a non-contact manner, charging the battery on the cage or directly powering the equipment. The entire process has no power cables, no contact, and no sparks, completely eliminating safety hazards such as cable wear, leakage, and breakage.

Dr. Li Dan, the company's founder, pointed out: "The mine environment has extremely high requirements for the safety of equipment. Our wireless charging equipment has no exposed electrodes and has a sealing level of IP67, which can operate stably for a long time in humid, dusty, and water-laden working conditions. More importantly, wireless charging is essentially spark-free, which fundamentally eliminates the ignition source in principle for mines with gas risks."

II. Precise Matching: WIRELESSPT Cage Wireless Charging Product Matrix

For cage equipment of different tonnages and different power consumption requirements, WIRELESSPT has launched a complete series of wireless charging products.  

Core performance highlights:

- High tolerance to offset: X-axis offset can reach ±110mm (@Z=40mm), Y-axis offset ±10mm. The cage can stop without precise positioning, and it automatically adapts.

- Wide working range: Vertical working distance 30-100mm (600W) or 40-100mm (900W/1200W), suitable for different cage structures.

- High efficiency: Full-load transmission efficiency ≥ 87%-92%, much higher than the industry average.

- Fully sealed protection: Receiver IP67, transmitter IP65, resistant to rainwater, dust, and corrosion.

- Wide temperature range: -40℃ to +60℃, suitable for extreme temperatures in the underground.

- Intelligent startup: Supports 485/CAN command to wake up or "proximity charging" mode, fully automatic without manual intervention.

- Multiple protections: Over-temperature, over-current, over-voltage protection. Over-temperature protection automatically reduces power or stops when temperature exceeds 82℃.

III. Practical Value: From "Passive Maintenance" to "Active Safety"

In a major mining group's auxiliary shaft elevator renovation project, the original traction cables were replaced every three months due to wear and tear, each replacement requiring a 2-hour shutdown, resulting in direct losses of several hundred thousand yuan. Moreover, there was a risk of electric leakage and injury. After introducing the WIRELESSPT1200W wireless charging system:

- The traction cables were completely eliminated, eliminating the risks of wear and tear and electric leakage

- Maintenance time was reduced by 90%, and there was no need for regular cable replacement

- Equipment availability rate was increased to 99.9%, and the cage lighting, monitoring, and intercom systems achieved uninterrupted power supply 24/7

- Workers no longer needed to operate at heights above the wellhead with electricity, eliminating the risk of electric shock

"In mines, safety is the greatest benefit. Our cage wireless charging solution allows customers to no longer worry about the accidents caused by traction cables, and truly focus their efforts on production."

IV. Market Prospects: The Inevitable Choice for Intelligent Mines

According to industry data, it is estimated that the revenue of China's mine hoist market will reach 36.5 billion yuan by 2025, with a compound annual growth rate of over 15%. The global mine hoist market size grows at an average annual rate of approximately 3%, with Asia accounting for 40% of the share. With the deepening of intelligent mine construction, the wireless and intelligent power supply mode of the cage, which is the core node for transporting personnel and materials, has become an inevitable trend.

WIRELESSPT has been deeply engaged in the industrial wireless charging field for ten years, with over a hundred patents. Its products cover the full power range of 10W to 30kW. It has served over 100 well-known enterprises such as CSSC, Weichai, Southern Power Grid, and Luneng. In the mining field, the company, with its explosion-proof certification, high protection level, and high reliability product characteristics, has become a strategic supplier for many mining groups.

What was cut was a cable, and what was connected was a sense of security.

From power cables to wireless power supply, it may seem like just a change in the power supply method, but in reality, it represents a leap in the concept of mine safety management. The WIRELESSPT cage wireless charging solution uses non-contact, spark-free, and maintenance-free technologies to cut off that dangerous "tail" of the mine hoisting system, making each lift more reassuring.