516results about How to "Guaranteed height" patented technology

The invention discloses a dual-head 3D printer capable of rotatably switching printing heads. The dual-head 3D printer is characterized by comprising a fixing plate, an installation plate which is arranged on the fixing plate, a first printing head and a second printing head, wherein the first printing head and the second printing head are installed on the installation plate in parallel; the fixing plate is provided with a fixed rotating shaft, and the installation plate is connected to the fixed rotating shaft in a way of rotating around the axis of the fixed rotating shaft; the first printing head is arranged below the fixed rotating shaft to the left side, and the second printing head is arranged below the fixed rotating shaft to the right side; and the dual-head 3D printer also comprises a drive mechanism for driving the installation plate to rotate along the fixed rotating shaft. The installation plate is driven by the drive mechanism to rotate, so that the structure that the heights of the two printing heads can be adjusted up and down relatively in the vertical direction, the working printing head is always maintained at a relatively low position, and the non-working printing head is maintained at a relatively high position; thus, the non-working printing head does not influence the surface of a molded workpiece, and the printing quality is improved.

A package structure including a substrate, a shielding element, a chip, a sealant layer and a semiconductor device is provided. The substrate has a first surface and a second surface opposite to the first surface. The shielding element is disposed on the first surface. The chip is disposed on the shielding element and is electrically connected to the substrate. The sealant layer is disposed on the first surface, and encapsulates the chip and the shielding element. The semiconductor device is disposed on the second surface.

The present invention provides an intermediate pour stopper of a portable beverage container. A cover body (4) comprises the following components: a locking component (29) which is retreatably equipped in an approximate horizontal back-and-back direction, and a force application unit (39) which applies a force on the locking component (29) in a snapping direction. The back part of the locking component (29) is provided with an abutting inclined surface which inclines from the front part to the back part and to the oblique lower side. When a snapping releasing button (40) is pressed, the abutting inclined surface abuts against a snapping releasing inclined surface so that the locking component slides frontwards. The front part is provided with a snapping part (5) which projects to the inside direction and is snapped with a snapping recess part (28). The snapping releasing button (40) is equipped on the upper part and has good visual confirmation property. The cover body (4) has high cleaning property because the cover body is totally opened.

The invention provides a multilayer segmentation-stubble leaving cutting knife device of first-crop ratooning rice, a control method of the multilayer segmentation-stubble leaving cutting knife device, and a combine harvester of the first-crop ratooning rice. The multilayer segmentation-stubble leaving cutting knife device of the first-crop ratooning rice comprises a cutting table, segmentation cutting knives and stubble leaving cutting knives, wherein the cutting table is used for cutting ratooning rice ear heads; at least one segmentation cutting knife is positioned at the lower back side ofthe cutting table; the segmentation cutting knives are hinged onto a walking chassis; the cutting height of the segmentation cutting knives is controlled through a second executing mechanism, and thesegmentation cutting knives are used for cutting field returning stems; the stubble leaving cutting knives are positioned at the lower back sides of the segmentation cutting knives, and are hinged onto the walking chassis; and the cutting height of the stubble leaving cutting knives is controlled through a third executing mechanism, and the stubble leaving cutting knives are used for cutting upper part stubble leaving stems. The harvesting operation on the ear heads only having a small number of stems can be realized, and meanwhile, the rice stubble height and the field returning stem lengthcan be ensured, so that the size of devices such as the cutting table, a screw conveyer and a conveying groove of the combine harvester can be greatly reduced; and the small-size and light-weight design of the combine harvester is realized.