4results about How to "Maintain structural strength" patented technology

This application provides a modified photocurable oligomer, its preparation method, and a photocurable 3D printing resin. The preparation method of the modified photocurable oligomer includes the following steps: providing an acrylic monomer, a triblock thermoplastic elastomer, a coupling agent, and a polyurethane acrylate; dissolving the triblock thermoplastic elastomer in the acrylic monomer to obtain a block copolymer mixed solution; adding the coupling agent to the block copolymer mixed solution to obtain a modified block copolymer mixed solution; adding the polyurethane acrylate to the modified block copolymer mixed solution, and mixing to obtain the modified photocurable oligomer. The modified photocurable oligomer, its preparation method, and the photocurable 3D printing resin provided in this application use a triblock thermoplastic elastomer as a toughening reinforcing phase, and chemically modify its surface using a coupling agent, enabling it to form a strong chemical bond interface with the polyurethane acrylate after pre-dispersion in the acrylic monomer.

This utility model discloses a railing device, relating to the field of railing technology. The device includes a post, a crossbar, and a wooden wedge-shaped locking strip. The post has a rectangular groove on its side; the crossbar has an insertion part at its end, with a wedge-shaped groove at its top; the locking strip has a right-angled trapezoidal cross-section and achieves mechanical self-locking by inserting its inclined surface downwards into the wedge-shaped groove. When the locking strip is inserted, its inclined surface presses against the inner wall of the wedge-shaped groove, forcing the insertion part to expand inwards and press against the inner wall of the rectangular groove, forming a horizontal compressive force; simultaneously, the top of the locking strip presses against the upper edge of the rectangular groove, resisting vertical pull-out force. This device uses an all-wood structure, eliminating the risk of corrosion from metal nails and extending its service life; at the same time, the wedge-shaped self-locking structure provides strong resistance to pull-out and impact, preventing loosening, and is suitable for outdoor scenarios such as parks and boardwalks.

The invention provides a bending structure, an insertion part and a medical catheter, and relates to the technical field of medical instruments. The device comprises a lining bending pipe and a traction rope, the lining bending pipe is of a pipe body structure which is continuously arranged in a closed mode in the circumferential direction, the far end of the traction rope is fixedly connected relative to the far end of the lining bending pipe, and the traction rope can apply traction force to the lining bending pipe; the action direction of the traction force deviates from the axial direction of the lining bent pipe. Compared with the prior art, the bending starting state can be optimized, the driving force needed by bending operation is reduced, the difficulty that the whole catheter achieves the bending action is reduced, and therefore the bending response performance and the control efficiency are improved.