The present disclosure discloses a score board for a competition and a hinge group thereof. The score board includes a first box and a second box which are connected through a hinge group, the hinge group includes an upper hinge and a lower hinge, the upper hinge and the lower hinge are mutually hinged together, the upper hinge is hinged to the first box, the upper hinge is slidably disposed on the second box, and the lower hinge is slidably disposed on the first box. When the first box and the second box are unfolded, display screens on front surfaces of the first box and the second box can be used to display scores of the competition.

A linear stem (3) guides a sliding door (11), which is dragged by a magnetic drive unit between an operating position (W), in which it covers and closes an access mouth (20) to an internal compartment (21) of a sterilizer (1), and an inoperative or opening (N), in which the door (11) moves to a position next to the access mouth (20), thus making it accessible from the outside. The sliding door (11) is operated by movement members (5), comprising a linear module (50), adapted to house a transmission belt (52) stretched between two return wheels (53), one of which is driven by an electric gearmotor (54); a branch of the transmission belt (52) carries a slider (55) with a permanent magnet (56), facing a magnetic plate (6) fixed to the sliding door (11) which is dragged by the magnetic field generated by the cursor (55) in motion.

An automatically openable and closable door includes: a door body, a driving device, and a transmission mechanism. The driving device includes a driving mechanism and a control mechanism, the driving mechanism is provided with a driving motor, and one side of the driving motor is provided with a first space; and the door body is connected to the driving motor, so as to be driven to rotate; where after being inserted into the first space, the door body is capable of rotating clockwise or counterclockwise to switch from a closed state to an open state.

A pet movable door and a cat litter box. The pet movable door includes: a door panel, a clutch structure, and a drive unit. The drive unit is connected to the door panel in a transmission manner via the clutch structure, so as to drive the door panel to move in a predetermined direction. The clutch structure is configured to separate from each other when a force acting in a direction opposite to the predetermined direction reaches a predetermined value, such that the door panel is separated from the drive unit.

A waste food processing machine provides hands-free operation for improved hygiene and convenience, particularly where minimizing contact with surfaces is essential. The machine incorporates a control system coupled with a door opening mechanism and features a hands-free switchsuch as a foot-operated or bump switchthat allows users to open and close the machine door without using their hands. The hands-free switch, mounted on the machine's chassis, sends activation signals to the control system to engage the door opening mechanism, which could be an electric motor or a hydraulic pump. This mechanism enables the access door to the drum to open or close. Should the switch be activated while the door is in motion, the door halts and can reverse its movement with subsequent activations.