Abstract: A mine cooling and dehumidifying system includes a compressor, a gas-liquid separator, an evaporator, a condenser and an expansion valve. The evaporator is in an air supply well, and the condenser is in a return air well; the compressor, the gas-liquid separator and the expansion valve are all between the air supply well and the return air well; an inlet of the compressor is connected to a refrigerant outlet of the evaporator through the gas-liquid separator, and a refrigerant inlet of the evaporator is connected with an outlet of the expansion valve; an inlet of the expansion valve is connected with a refrigerant outlet of the condenser, and a refrigerant inlet of the condenser is connected with an outlet of the compressor. In the present disclosure, by vapor compression type refrigeration cycle, the downhole air heat is transferred to the return air and then discharged to the ground.

Abstract: Provided are a magnetic attraction assembly and a display device. The magnetic attraction assembly includes first and second magnetic shields and a magnetic member magnetically connected to the second magnetic shield. The first magnetic shield includes a first body portion and a first connection portion. A first receiving cavity is disposed at a side of the first body portion. The magnetic member is disposed at least partially within the first receiving cavity and connected to the first magnetic shield. The second magnetic shield is disposed at another side of the magnetic member and includes a second connection portion and a second body portion disposed surrounding the second connection portion, the second body portion and the second connection portion define a second receiving cavity with an opening facing the first magnetic shield, the first body portion and the magnetic member are disposed at least partially within the second receiving cavity.

Abstract: An LED display module and an LED display panel. The LED display module includes: an LED board, a bottom shell and a connecting member; the connecting member is made of magnetic attraction material, and includes a snap-fitting part and a connecting part, the connecting part is configured to be fixedly connected with the LED board, the snap-fitting part is configured to be connected with the bottom shell in a snap-fit manner.

Abstract: Disclosed are a display panel and a display screen. The display panel includes a plurality of display modules and a cabinet. The plurality of display modules are distributed in a matrix and are fixed in front of the cabinet. The cabinet is provided with two display module openings and a power supply assembly opening. A protective cover plate is installed in front of the cabinet to cover the power supply assembly opening and form a power supply assembly cavity behind the cabinet, which is configured to install a power supply assembly. Two module opening cover plates are installed behind the cabinet to cover the two display module openings in a one-to-one correspondence.

Abstract: Disclosed are a display panel and a display screen. The display panel includes a plurality of display modules and a cabinet. The plurality of display modules are distributed in a matrix and are fixed in front of the cabinet. The cabinet is provided with two display module openings and a power supply assembly opening. A protective cover plate is installed in front of the cabinet to cover the power supply assembly opening and form a power supply assembly cavity behind the cabinet, which is configured to install a power supply assembly. Two module opening cover plates are installed behind the cabinet to cover the two display module openings in a one-to-one correspondence.

Abstract: The present invention relates to a display device comprising a mounting board and a display panel mounted on the mounting board and comprising a plurality of display modules arranged in an array, and further comprising a control module and a plurality of driving modules corresponding to the display modules. The control module is capable of controlling the driving modules to drive the corresponding display modules to extend. When the display device is powered on, the control module is electrically coupled to the driving module such that the driving module receives a signal from the control module and controls the display module to extend in response to the signal; when the driving module is started, the corresponding display module moves along with the driving module and automatically extends, facilitating the maintenance of the display device.

Abstract: The present invention relates to a display device comprising a mounting board and a display panel mounted on the mounting board and comprising a plurality of display modules arranged in an array, and further comprising a control module and a plurality of driving modules corresponding to the display modules. The control module is capable of controlling the driving modules to drive the corresponding display modules to extend. When the display device is powered on, the control module is electrically coupled to the driving module such that the driving module receives a signal from the control module and controls the display module to extend in response to the signal; when the driving module is started, the corresponding display module moves along with the driving module and automatically extends, facilitating the maintenance of the display device.

Abstract: An LED lamp includes a housing comprising a receptacle, first and second bossed holes in the receptacle, each bossed hole having internal threads, and a cover plate including parallel ribs projecting outward, and holes, the cover plate being secured to the receptacle by driving threaded fasteners therethrough into the second bossed holes; two opposite shoulders each formed lengthwise along a central line of an inner surface of either side of the receptacle; a PCB supported by the shoulder and the first bossed holes, the PCB being fastened in the receptacle by driving threaded fasteners therethrough into the first bossed holes; rows of units of LEDs electrically connected to the PCB wherein each row of units of LEDs is parallel to and adjacent the rib; and a waterproofing member in the housing for protecting the PCB. The LED lamp is shallow.

Abstract: An LED lighting device includes a receptacle comprising first and second bossed holes each having internal threads, and two opposite shoulders each formed lengthwise along a central line of an inner surface of either side of the receptacle; a cover plate comprising apertures and threadedly secured to the receptacle to form a housing; PCBs each supported by the shoulder and the first bossed holes and fastened in the receptacle by driving threaded fasteners therethrough into the first bossed holes; parallel elongated members each with the housing mounted thereon; units of LEDs electrically connected to the PCB wherein each unit of LEDs is fastened in the aperture; a waterproofing member filled in the housing for protecting the PCB; longitudinal and transverse frame members mounted on one surfaces of the elongated members; and a panel box mounted on the frame members, the panel box being electrically connected to the PCBs.

Abstract: An LED lamp includes a housing comprising a receptacle, first and second bossed holes in the receptacle, each bossed hole having internal threads, and a cover plate including parallel ribs projecting outward, and holes, the cover plate being secured to the receptacle by driving threaded fasteners therethrough into the second bossed holes; two opposite shoulders each formed lengthwise along a central line of an inner surface of either side of the receptacle; a PCB supported by the shoulder and the first bossed holes, the PCB being fastened in the receptacle by driving threaded fasteners therethrough into the first bossed holes; rows of units of LEDs electrically connected to the PCB wherein each row of units of LEDs is parallel to and adjacent the rib; and a waterproofing member in the housing for protecting the PCB. The LED lamp is shallow.

Abstract: An LED lighting device includes a receptacle comprising first and second bossed holes each having internal threads, and two opposite shoulders each formed lengthwise along a central line of an inner surface of either side of the receptacle; a cover plate comprising apertures and threadedly secured to the receptacle to form a housing; PCBs each supported by the shoulder and the first bossed holes and fastened in the receptacle by driving threaded fasteners therethrough into the first bossed holes; parallel elongated members each with the housing mounted thereon; units of LEDs electrically connected to the PCB wherein each unit of LEDs is fastened in the aperture; a waterproofing member filled in the housing for protecting the PCB; longitudinal and transverse frame members mounted on one surfaces of the elongated members; and a panel box mounted on the frame members, the panel box being electrically connected to the PCBs.