Patent AU-2020102687-A4 (AU)
Title: Safety Protection Method for the Ultra-high Pressure Hydraulic Slotting Device
Inventor: ZHANG YONGJIANG
IPC: E21F7/00
Filed: 2020-10-12
Granted: 2020-12-03
Abstract: The invention relates to a safety protection method for the ultra-high pressure hydraulic 
slotting device, belonging to the technical field of coal mine safety protection, which comprises 
the following steps of, S: The adjustable safety valve is installed on the ultra-high pressure 
fresh water pump to realize the water source safety protection of the ultra-high pressure 
hydraulic slotting device; S2: The ultra-high pressure hydraulic hosepipe, the ultra-high 
pressure rotating water tail and the ultra-high pressure sealing drill pipe are connected between 
the ultra-high pressure fresh water pump and the high and low pressure conversion slotting 
device to realize the safety protection of the transmission process of the ultra-high pressure 
water; S3: The remote operation platform is set up on the ultra-high pressure hydraulic 
hosepipe to ensure the operation safety of the ultra-high pressure hydraulic slotting operation; 
S4: Specific safety protection measures are taken at the joints between the ultra-high pressure 
hydraulic hosepipes and between the ultra-high pressure rotating hosepipe and the ultra-high 
pressure hydraulic hosepipe, so as to realize the safety protection of the connection position of 
the ultra-high pressure hydraulic hosepipe. The invention sets up a complete safety protection 
system that greatly improves the operation safety of the high-pressure hydraulic slotting device, 
and effectively avoids the occurrence of equipment safety accidents.
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Ultra-high pressure fresh water pump is installed with adjustable safety 
First class protection: valve, which can effectively prevent the pressure overload ofultra-high 
pressure fresh water pump. When the pump output pressure exceeds the 
Safety protection ofsource ofultra- threshold value, the safety valve automatically opens for pressure 
relief. When the pump is re-started, the internal components ofthe 
safety valve automatically reset and can be reused.  
The ultra-high pressure hydraulic hosepipe is mainly made ofouter 
Second class protection: PVC steel wire rubber hose and inner steel wire spiral hose, which can 
bear 150 MPa and ensure the safe transmission of high pressure water 
Safety protection ofultra-high of lOOMPa. In addition, the ultra-high pressure rotating water tail and 
ultra-high pressure sealing drill pipe meet the high pressure sealing 
transmission requirements.  
Third class protection: The long-distance operation ofultra-high pressure hydraulic slotting is 
achieved with the remote operation platform, to ensure that the on-site 
Safety protection ofremote operators timely grasp the situation ofslotting, and the safety of 
operation personnel is improved.  
The ultra-high pressure water transmission hose is connected with high
precision and high-strength thread transition joint, with high-pressure 
Four class protection: rubber hose sheath and anti-stripping chain at the end of the hosepipe for 
secondary protection. The high-precision thread taper joint is adopted to 
connect the high-pressure rotating water tail and ultra-high-pressure 
key components ofultra-high hosepipe, as well as the installation ofultra-high-pressure rotating water 
pressure water transmission tail sheath. Ensure tight connection and ensure the safety of high-pressure 
water transmission connection.  
Figure 1