9 results about "Premature failure" patented technology

The invention provides a double-row tapered roller bearing (10). The double-row tapered roller bearing (10) comprises two first bearing rings (1 and 2) which are arranged side by side, a second bearing ring (2 and 1) which is shared by a single body, and double-row tapered rollers (3 and 3 ') which are arranged between the two first bearing rings which are arranged side by side and the second bearing ring which is shared by the single body. Wherein the double rows of tapered rollers (3, 3 ') are designed asymmetrically different from each other. The asymmetric roller design allows non-balanced loads to be redistributed in the bearing according to application requirements, and the situation that one row of rollers and a raceway fail in advance due to overload is avoided. The asymmetric design breaks through the existing situation that the symmetric double-row tapered roller bearing is used for all complex loads, and the technical attention is drawn back to the specific distribution of the internal load of the bearing from the bearing capacity of the overall load of the bearing, so that people can provide bearing products meeting the requirements according to the requirements of specific application.

The invention provides an anti-bird grading ring of a composite insulator, relates to the field of grading rings, and aims to solve the problem that a connection structure of a conventional anti-bird grading ring is complex in shape, easy to cause casting defects and easy to break or lose efficacy in advance in operation. One end of the umbrella skirt unit extends out of the fixed cylinder unit, the two units are spliced to form a cylindrical fixed cylinder, and a convex positioning block is arranged on the periphery of the cylindrical fixed cylinder; a clamping groove is formed in the inner ring of the hoop, when the fixing cylinder is sleeved with the hoop, the positioning block is embedded into the clamping groove, and the relative positions of the two umbrella skirt units are fixed through the restraining force of the hoop. The positioning block is only used for axial limiting of the hoop, non-main force-bearing components are adopted, main force bearing is still achieved through radial constraint of the hoop on the fixing cylinder, the casting difficulty is lowered, the casting precision is improved, the problem that molten metal is not fully filled due to a hole structure is solved, and the stability in the operation process is improved.

The application discloses a semi-absorbing patch with gradient degradation regulation function, which comprises a main body, wherein the main body is a pre-prepared net structure, and the main body comprises a base net and a supporting section, two transition sections and two anchoring sections formed on the base net; the supporting section is located in the middle of the base net, and positioning areas for limiting the deviation of the main body are formed on both sides of the supporting section; the application is characterized in that the symmetrically decreasing gradient degradation makes the degradation rate of the patch more matched with the tissue regeneration rate, and the patch and the new tissue realize stable symbiosis in the form of semi-absorption; the supporting section is rapidly degraded, and the anchoring section still maintains mechanical strength, so that the stress is smoothly transferred from the patch to the new tissue, imbalance caused by uniform degradation rate is avoided, and insufficient support caused by premature failure of the degradable material is prevented; and the patch can also be customized according to the needs of different groups of people, so that the differentiated needs of different groups of people for the patch specifications are better met.

The present invention discloses a design method, a calculation method and a bearing for a double-row spherical roller bearing without eccentric load based on a skew angle. The skew angle can be obtained through basic design information of the eccentric load. The design of the skew angle can effectively avoid the dilemma that conventional empirical settings cannot obtain the optimal solution, unify its design standards, avoid the dilemma that the empirical value setting cannot reach the optimal solution, effectively solve the problem of eccentric load caused by the bearing being subjected to a large combined load, resulting in premature failure of one row of rollers due to excessive load, and improve the fatigue life of the bearing.

The invention discloses a novel high-temperature-resistant split-type soluble bridge plug. The novel high-temperature-resistant split-type soluble bridge plug is mainly designed in an optimized mode for a sealing assembly and a slip structure. The conical contour sealing ring structure is adopted, the geometrical shape of the conical contour sealing ring structure is matched with the outer contour of a matched cone, the vulcanized rubber sleeve is innovatively covered on the outer surface of the sealing ring base body, the dissolution rate of the sealing ring is effectively delayed through the material synergistic effect, and premature failure of the sealing ring is prevented. Aiming at the sealing requirement of the underground complex working condition, the split slip breaks through the traditional single structure mode, the double-form combined slip of the convex slip and the concave slip with differential functions is innovatively designed, the convex slip achieves the main pressure-bearing anchoring function, the concave slip forms an auxiliary sealing interface, and the main pressure-bearing anchoring function is achieved. The synergistic effect of the two significantly improves the sealing performance of the sealing structure. According to the invention, the dissolution controllability and the sealing reliability are doubly improved.

The present invention relates to the technical field of shield-assembled segment lining, and in particular to a shield-assembled segment positioning and bearing structure, including a positioning tenon and a tenon groove penetrating the segment joint surface, the positioning tenon including a cylindrical sleeve, truncated cone sleeves symmetrically arranged at both ends of the cylindrical sleeve in the axial direction, the cylindrical sleeve and the truncated cone sleeve being integrally formed, a reinforcing rib structure being arranged in the segment corresponding to the tenon groove, and the reinforcing rib structure being symmetrically arranged relative to the positioning tenon in the use state. By combining the structural characteristics of the actual shear failure zone of the segment, a reinforcing rib structure is arranged in the segment perpendicular to the fracture surface, and a positioning tenon and a reinforcing rib structure of a specific structure are combined, so as to improve the shear resistance of the shield-assembled segment positioning and bearing structure, and avoid the segment from losing its bearing capacity due to premature failure caused by stress concentration. At the same time, a cylindrical sleeve is adopted in the middle of the positioning tenon, so as to avoid a slight displacement of the positioning tenon and a significant change in its effective thickness.

The invention provides an application of a methoxy isoflavone compound in prevention and treatment of premature ovarian failure. A large number of studies find that the biochanin A and formononetin can effectively improve ovarian reserve function decline or estrus cycle disorder caused by premature senility, adjust the estrogen level, promote follicle development and maturity, increase the ovarian index, increase ovarian reserve and recover the ovarian function. Meanwhile, the biochanin A and the formononetin have the advantages of good stability, high biological activity and low toxicity, can be safely used for preparing medicines for preventing or / and treating ovarian reserve hypofunction and premature senility, and have good patent medicine prospects.

The utility model provides a clamp for a compression test of a composite material tabulate test piece, which comprises an upper pressing assembly and a lower pressing assembly, the upper pressing assembly comprises a first upper clamping plate, a second upper clamping plate and an upper pressing plate, and the upper pressing plate is connected to the upper parts of the first upper clamping plate and the second upper clamping plate; the lower pressing assembly comprises a first lower clamping plate, a second lower clamping plate and a lower pressing plate, the lower pressing plate is connected to the lower portions of the first lower clamping plate and the second lower clamping plate, and the sizes of the first upper clamping plate, the second upper clamping plate and the upper pressing plate in the first direction parallel to the width direction of the test piece are larger than the width of the test piece; the sizes of the first lower clamping plate, the second lower clamping plate and the lower pressing plate in the first direction are greater than the width of the test piece. According to the scheme, a transverse deformation space can be reserved for the end part of the test piece when the test piece is subjected to a compression test, and free deformation of the test piece is allowed, so that stress concentration of an interface of the test piece and the clamp can be reduced, and test failure caused by advanced damage of the test piece is avoided.

A flexible connection device of a Type IV cylinder and a container frame, comprising a damping block, an anti-rotation block, a bushing, upper and lower clamping blocks (43, 44), and the like. The damping block cooperates with the anti-rotation block to flexibly control the circumferential rotation of the Type IV cylinder; and the bushing is combined with the upper and lower clamping blocks (43, 44) to limit the axial motion of the Type IV cylinder. For the feature that the interface of a boss and a plastic liner / composite overwrap is prone to premature failure, by allowing axial movement of one end of the Type IV cylinder in the container within a small range, a binding force borne by the cylinder during expansion / contraction is released, and the damping block is squeezed to consume energy.