Abstract: The present disclosure discloses a child safety seat, which is for being installed on a vehicle seat. The child safety seat includes a base having an anchor part connected to the vehicle seat; a seat coupled to the base; a top rod fixed to the rear of the base; a tether assembly including a top tether and a tether fixing portion that are connected with each other, the top tether being connected with the top rod and the tether fixing portion being connected with the vehicle seat; and an alarm device including a switch which can be triggered when the top tether is tightened. The present disclosure also discloses a tether assembly and a support structure. The child safety seat can conveniently prompt that it is not correctly fixed, and can be conveniently fixed and adjusted, thereby improving the safety and riding comfort of the child safety seat.

Abstract: A partitioned lifting forming type selective laser melting workbench, comprises at least forming platform (1) for powder-spreading and sintering and forming of workpiece, the forming platform (1) comprises forming inner abutment (1-1) and at least one forming outer abutment (1-2) which is sleeved on the forming inner abutment (1-1) and arranged in sequence from the inside to the outside in a radial direction, the forming inner abutment (1-1) and each forming outer abutment (1-2) are arranged in a manner of rise and fall, the forming inner abutment (1-1) or the forming outer abutment (1-2) falls independently, or the forming outer abutment (1-2) and the adjacent forming outer abutment or/and the forming inner abutment (1-1) fall together, it can form an area (2) to be subjected to powder-spreading for laser sintering and forming of workpiece.

Abstract: A efficient large-scale selective laser melting forming device comprises a rack (1), a forming workbench (2) arranged on the rack, a forming bin (3) sleeved on the forming workbench and a galvanometer scanning device (7) arranged outside the forming bin and moving reciprocally along the powder spreading direction to form a multi-station working state, and a smoke blowing and sucking mechanism (8) arranged in the forming bin in a mode of synchronously moving to the same station with the galvanometer scanning device. The galvanometer scanning device can move reciprocally along the powder spreading direction to form a multi-station working state. The galvanometer scanning device is entirely arranged outside the forming bin. The smoke blowing and sucking mechanism arranged in the forming bin can synchronously move with the galvanometer scanning device to the same station.

Abstract: A partitioned lifting forming type selective laser melting workbench, comprises at least forming platform (1) for powder-spreading and sintering and forming of workpiece, the forming platform (1) comprises forming inner abutment (1-1) and at least one forming outer abutment (1-2) which is sleeved on the forming inner abutment (1-1) and arranged in sequence from the inside to the outside in a radial direction, the forming inner abutment (1-1) and each forming outer abutment (1-2) are arranged in a manner of rise and fall, the forming inner abutment (1-1) or the forming outer abutment (1-2) falls independently, or the forming outer abutment (1-2) and the adjacent forming outer abutment or/and the forming inner abutment (1-1) fall together, it can form an area (2) to be subjected to powder-spreading for laser sintering and forming of workpiece.