A system and method for remotely locating a communication error support for hydraulic supports. The system includes a control panel, a support controller, a data converter, and two support drivers of the same type. Each support driver has two bus interfaces. The control panel transmits a control command to the data converter in a form of a WiFi signal. The data converter converts the WiFi signal into a message signal and transmits the message signal to the support controller. The support controller transmits the control command to the two support drivers, respectively. The support drivers transmit the command through CANH twisted pairs and CANL twisted pairs. When a bus for transmitting the command of a certain node has an error, the support controller calculates the fault node according to a formula $n=\frac{pt}{8m},$
and feeds back the fault node onto the control panel.

A system and method for remotely locating a communication error support for hydraulic supports. The system includes a control panel, a support controller, a data converter, and two support drivers of the same type. Each support driver has two bus interfaces. The control panel transmits a control command to the data converter in a form of a WiFi signal. The data converter converts the WiFi signal into a message signal and transmits the message signal to the support controller. The support controller transmits the control command to the two support drivers, respectively. The support drivers transmit the command through CANH twisted pairs and CANL twisted pairs. When a bus for transmitting the command of a certain node has an error, the support controller calculates the fault node according to a formula $n=\frac{pt}{8m},$
and feeds back the fault node onto the control panel.

A hydraulic support unit and a hydraulic support for anti-rock burst roadway. The hydraulic support unit includes a base, a top beam, and a hydraulic support column, the top beam is positioned above the base in a spaced manner; the hydraulic support column are disposed between the base and the top beam; a side guard plate and a first base hydraulic cylinder are disposed on the left side and right side of the base, the side guard plates are rotably connected to the base, the two ends of the first base hydraulic cylinder are hinged to the base and the side guard plate respectively, the first base hydraulic cylinder can drive the side guard plate to transit between a horizontal state and a vertical state, and the bottom surfaces of the side guard plates are flush with the bottom surface of the base in the horizontal state.

A self-advancing roof support for a longwall mining system includes a base, a hydraulic actuator having one end pivotally coupled to the base, and a canopy portion that is connected to another end of the hydraulic actuator. The roof support also includes a load sensor disposed on the canopy portion. The load sensor generates a signal indicative of an amount of load borne by the canopy portion in abutment with a roof of an underground mine site. A controller is communicably coupled to the load sensor and the hydraulic actuator. The controller determines if the signal from the load sensor is suggestive of a cavity adjacent to a zone above the canopy portion. Based on the determination, the controller actuates movement of the hydraulic actuator such that the canopy portion is displaced into a position underlying the cavity.

An apparatus, system, and method for automated support of a gate entry for underground full extraction mining that includes gathering entry data for a condition of a gate entry by way of a gate entry support. The method also includes determining, by way of the gate entry support, the condition of the gate entry, advancing the gate entry support in response to determining that the condition satisfies an entry condition threshold. The method may also signal a halt condition for a production cycle, if the condition fails to satisfy the entry condition threshold.

A method for implementing a centralized control platform of a hydraulic support on a fully mechanized mining working face in underground coal mines, which is used for safety production in the underground coal mines. A Siemens PLC S7-300, a C8051F020 single chip microcomputer, a PowerBuilder tool, an SQLServer database and a multi-protocol communication platform are selected to form the centralized control platform, wherein the PowerBuilder tool is used as a front-end development platform; the Siemens PLC S7-300 and the C8051F020 single chip microcomputer are used as a real-time control platform; the PLC is connected to an electro-hydraulic control system, and a communication protocol thereof is a TCP/IP MODBUS protocol; the PLC acts as a client; the electro-hydraulic control system acts as a server end; an infrared transmission apparatus is mounted on a coal mining machine; a receiving apparatus is embedded into a support controller of the electro-hydraulic control system; and after receiving infrared information, the support controller transmits the information to an explosion-proof computer of the electro-hydraulic control system. The method may satisfy control functions required by an unattended or nearly unattended working face; can reliably complete various control functions based on operation of an adjacent support; can remotely transmit various pieces of information to a ground monitoring center in real time; and can monitor various failures in coal mining process in real time.

A method for implementing a centralized control platform of a hydraulic support on a fully mechanized mining working face in underground coal mines, which is used for safety production in the underground coal mines. A Siemens PLC S7-300, a C8051F020 single chip microcomputer, a PowerBuilder tool, an SQLServer database and a multi-protocol communication platform are selected to form the centralized control platform, wherein the PowerBuilder tool is used as a front-end development platform; the Siemens PLC S7-300 and the C8051F020 single chip microcomputer are used as a real-time control platform; the PLC is connected to an electro-hydraulic control system, and a communication protocol thereof is a TCP/IP MODBUS protocol; the PLC acts as a client; the electro-hydraulic control system acts as a server end; an infrared transmission apparatus is mounted on a coal mining machine; a receiving apparatus is embedded into a support controller of the electro-hydraulic control system; and after receiving infrared information, the support controller transmits the information to an explosion-proof computer of the electro-hydraulic control system. The method may satisfy control functions required by an unattended or nearly unattended working face; can reliably complete various control functions based on operation of an adjacent support; can remotely transmit various pieces of information to a ground monitoring center in real time; and can monitor various failures in coal mining process in real time.

A roof support includes a base, a canopy for engaging a mine surface, a shield coupled to the canopy, and a link coupled between the base and the shield. The canopy is supported relative to the base and includes an end configured to be spaced apart from a mine face by a distance. The link is movable between a first position and a second position, and movement of the link between the first position and the second position causing the distance to change.

A roof support includes a base, a canopy for engaging a mine surface, a shield coupled to the canopy, and a link coupled between the base and the shield. The canopy is supported relative to the base and includes an end configured to be spaced apart from a mine face by a distance. The link is movable between a first position and a second position, and movement of the link between the first position and the second position causing the distance to change.

A self-advancing roof support for a longwall mining system includes a base, a hydraulic actuator having one end pivotally coupled to the base, and a canopy portion that is connected to another end of the hydraulic actuator. The roof support also includes a load sensor disposed on the canopy portion. The load sensor generates a signal indicative of an amount of load borne by the canopy portion in abutment with a roof of an underground mine site. A controller is communicably coupled to the load sensor and the hydraulic actuator. The controller determines if the signal from the load sensor is suggestive of a cavity adjacent to a zone above the canopy portion. Based on the determination, the controller actuates movement of the hydraulic actuator such that the canopy portion is displaced into a position underlying the cavity.