Blast hole sealing device for coal mine underground top cutting blasting

The sealing device for underground roof cutting blasting in coal mines, designed with support rods, insertion rods, and hydraulic cylinder and air pump systems, solves the problem of weak connection between the sealing device and the inner wall of the blast hole, improves the stability and sealing performance of the sealing structure, and enhances the safety and environmental performance of blasting operations.

CN224202315UActive Publication Date: 2026-05-05ANHUI UNIV OF SCI & TECH
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Patent Information

Application Number
CN202521278024.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-06-21
Publication Date
2026-05-05
Estimated Expiration
2035-06-21

AI Technical Summary

Technical Problem

The existing sealing device for blasting holes used in underground coal mine roof cutting blasting is not firmly connected to the inner wall of the blasting hole, which makes the sealing structure prone to displacement or detachment during blasting impact, reducing the stability and sealing performance of the seal. In addition, traditional sealing materials are difficult to deliver accurately to the designated position and have poor expansion and solidification effects.

Method used

It adopts a support rod and insertion rod design, combined with a hydraulic cylinder and air pump system. The mechanical structure fits tightly against the inner wall of the blast hole. The support rod and annular airbag enhance the connection stability, and the slider and groove ensure operational stability, realizing flexible adjustment of the support rod and dynamic sealing of the airbag.

Benefits of technology

It improves the overall stability and sealing performance of the sealing device, reduces construction difficulty and safety hazards, ensures the stability and reliability of sealing quality, and enhances blasting efficiency and the safety and environmental performance of mine production.

✦ Generated by Eureka AI based on patent content.
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Abstract

The utility model relates to the technical field of coal mines, in particular to a blast hole sealing device for coal mine underground top cutting blasting, which is characterized in that the top of a top frame is fixedly connected with a top plate, the top of the top plate is fixedly connected with a hydraulic oil cylinder through a bolt, and an output shaft of the hydraulic oil cylinder penetrates through the top plate and is fixedly connected with the top of a fixed plate; a plurality of supporting rods are fixedly connected to the bottom of the fixing plate, the extending ends of all the supporting rods sequentially penetrate through the top of the top frame and the side wall of the bearing cylinder, and an annular plate is fixedly connected to the bottom of the fixing plate. Through the design of the supporting rod and the inserting rod, connection between the hole sealing device and the inner wall of the blast hole is firmer, the problem that traditional hole sealing materials such as yellow mud fail to be sprayed out due to axial impact force generated by explosive explosion is solved, and therefore the overall stability and sealing performance of blast hole sealing are improved; the whole device can be tightly attached to the inner wall of the blast hole, and stability is achieved through a mechanical structure instead of a loose hole sealing agent.
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