12results about How to "Maintain structural strength" patented technology

The invention relates to an elevation control and precise regulation and control method for frozen sand mold additive manufacturing in a time sequence space. According to the method, a mathematical model that the thickness of floating sand changes along with time due to moisture heat exchange of the frozen sand mold in air is established, and the thickness of the floating sand of frozen sand molds with different curved surfaces under the parameter conditions of different environment temperatures, time scales, sand mold materials, moisture contents and the like is predicted and fed back; and in the freezing printing process, real-time adhesive and height compensation is carried out on sand molds at different wall thicknesses, and the dimensional precision and geometric precision of the frozen sand molds are protected to a certain extent. According to the method, the problem of dimensional accuracy error caused by floating sand generated by heat exchange in air in the manufacturing and subsequent placing processes of the frozen sand mold is effectively solved, and the dimensional accuracy of the sand mold during casting is ensured.

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.

The utility model discloses a G68 type rim cover which comprises a rim cover body, the rim cover body comprises a connecting part, a first mounting part and a second mounting part are symmetrically arranged on the two sides of the connecting part, the end of the first mounting part and the end of the second mounting part are each of an inclined protruding structure, and assembling parts are arranged on the back face of the first mounting part and the back face of the second mounting part. The wheel rim cover body is assembled with the automobile hub through the assembly part, and the wheel rim cover body has certain attractiveness; the rim cover is made of high-strength plastic or carbon fibers, and the structural strength and durability are kept while the weight of the rim cover body is reduced.

The utility model discloses a G45 type rim cover which comprises a rim cover body, a first cover body is arranged on the rim cover body, a second cover body and a third cover body are symmetrically arranged on the two sides of the first cover body, triangular assembly blocks are arranged on one side of the front end of the second cover body and one side of the front end of the third cover body, and an installation base is arranged on the back face of the rim cover body. The wheel rim cover is assembled with the automobile hub through the triangular assembly block and the mounting seat, and the wheel rim cover has a certain aesthetic degree; the rim cover is made of high-strength plastic or carbon fibers, and the structural strength and durability are kept while the light weight of the rim cover is achieved.

The utility model discloses a modularization power amplifier assembly structure for sound box system, including by the external casing, and the control board of setting in the power amplifier main part of external casing constitution, the tail of external casing is equipped with the terminal, and the one side of terminal is connected with the terminal fixed post, and the tail of bottom frame is equipped with the terminal through -hole, and the terminal through -hole vicinity is equipped with the terminal fixed hole corresponding with terminal fixed post, and the terminal fixed hole is fixed with terminal fixed post through terminal fixing piece, and the one side of control board is equipped with female seat and power, and the one side of bottom frame is opened in female seat corresponding department and is equipped with power fixed hole, and the edge of female seat is fixed in bottom frame through female seat fixing piece of power fixed hole, and the opposite side of control board in the terminal one side is equipped with the plug, and the one side of external casing is encapsulated through the front stage panel, and is equipped with each knob on the front stage panel, and the tail of each knob is equipped with the jack corresponding with plug. The utility model solves the problem of the insufficient strength and the complex process caused by the punching fixing of PCB and shell in the prior art.

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 utility model relates to the field of crucible fixing, disclose a kind of for electron beam horizontal smelting furnace's crucible fixing structure, including frame, the top of the frame has two groups horizontal crucible, the inner wall of the frame is equipped with multiple groups double-end equal-length stud, the top of the frame is provided with multiple groups first support seat, the top of each group first support seat is respectively provided with a group first crucible pressing plate, multiple groups first crucible pressing plate and multiple groups first support seat are respectively sleeved in the outer wall of a group double-end equal-length stud.The utility model reserves necessary deformation space by the cooperation between groove and crucible outer buckle and crucible inner buckle, effectively relieves the internal stress caused by the difference of expansion coefficient, key components can be reused, not only play to the extreme crucible body life, also greatly reduce the spare parts procurement cost, reduce the risk of damaging crucible due to difficult disassembly, improve the safety and efficiency of maintenance operation.

The utility model relates to diamond saw blade technical field, concretely relates to a double -row cutter head diamond saw blade. In the saw blade of the application, first cutter head group and second cutter head group are arranged along the circumferential direction interval on the one side of saw blade base body, form double -row blade mouth structure. Compared with traditional single -row cutter head, this design can make the stress of saw blade more dispersed and even when cutting, effectively reduce the local stress concentration problem of cutter head. Secondly, the diamond cutter head of two groups of cutter heads all extends towards the center of saw blade base body and is arranged, in the cutting process, the cutter head as the main cutting component directly contacts the cutting material, and the edge of the base body is covered by the cutter head, avoids with material direct friction, collision, thereby greatly reduces the base body wear degree, effectively maintains the structural strength and rigidity of base body.

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.

The utility model belongs to the technical field of powder metallurgy, and particularly relates to a ceramic pad for bearing a powder metallurgy sintered part. The ceramic pad is integrally formed by a ceramic material and comprises a bottom supporting platform and a group of side supporting blocks arranged around the periphery of the bottom supporting platform; the bottom supporting platform is provided with an annular surrounding edge and a network supporting body connected in an area defined by the surrounding edge. The upper side of the network support body is provided with a flat bearing surface for bearing the powder metallurgy sintered part, and a plurality of vertically through heat exchange holes are further distributed in the network support body; the side supporting blocks are arranged at intervals, the ends of the side supporting blocks are flush, and when the ceramic pads are stacked, the side supporting blocks bear the surrounding edge of the upper ceramic pad. A heat exchange notch is formed between every two adjacent side supporting blocks. The ceramic pad has excellent high temperature resistance, heat exchange efficiency, structural strength, bearing capacity and stacking stability in the sintering process of powder metallurgy parts, the influence of a sintering furnace on blank sintering can be effectively avoided, and the quality and production efficiency of sintered parts are remarkably improved.

The utility model discloses a stainless steel composite wire, which relates to the technical field of stainless steel composite wires, and comprises a stainless steel inner core and first memory protection layers, the first memory protection layers are annularly arrayed on the outer surface of the stainless steel inner core, and the first memory protection layers are coated with compression-resistant protection layers. A second memory protection layer is arranged outside the pressure-resistant protection layer in an annular array mode, and an outer protection layer is arranged outside the second memory protection layer. According to the stainless steel composite wire rod, by arranging the first memory protection layer and the second memory protection layer, structural damage caused by external acting force can be reduced to a certain extent, and by using the compression-resistant protection layer and the outer protection layer, it can be guaranteed that the whole wire rod structure has enough supporting performance; the polytetrafluoroethylene protective layer is sprayed on the surface of the stainless steel inner core, so that the stainless steel inner core can be effectively guaranteed to still have enough anti-rust protection under the condition that each external structure is damaged.