41results about How to "Less prone to fatigue damage" patented technology

The invention discloses an overflow valve comprising a valve body, a main valve seat, a main valve core, a pilot valve seat, a pilot valve core, a main valve spring, a pilot valve spring, a pilot valve seat installation hole and a pilot valve seat limit part, wherein the main valve seat is fixedly sleeved in the valve body, and the pilot valve seat is movably sleeved in the pilot valve seat installation hole and is provided with a pilot valve oil inlet; and the pilot valve seat limit part is used for limiting the motion range of the pilot valve seat, so that the motion stroke of the pilot valve seat is shorter than that of the pilot valve core. Compared with the prior art, with the adoption of the overflow valve, abrasion of the pilot valve core and the pilot valve seat is small, and the pre-pressure of the pilot valve spring is small, so that the using reliability of the overflow valve can be greatly improved, and the service life of the overflow valve can be greatly prolonged.

The invention discloses an adapter piece for transmitting torque between a square shaft and a square hole shaft, which belongs to the technical field of measurement and the field of mechanical assembly accessories. The adapter for transmitting torque between a square shaft and a square hole shaft according to the present invention includes a square cylinder, the inner and outer radial surfaces of the square cylinder are adapted to the square shaft and the square hole respectively, and the square cylinder is a split type , which is composed of two symmetrical right-angle gaskets. Under the torsion state, the two right-angle gaskets open to the surroundings and fit with the inner wall of the square hole; the upper ends of the right-angle gaskets are respectively provided with mounting pieces. The mounting tabs are perpendicular to the right-angle spacers. The adapter of the present invention can be tightly attached to the inner wall of the square hole when in use, is only subjected to pressure, transmits torque through force without being subjected to torque, is not damaged by torsion, and is not easily damaged by fatigue. The adapter of the present invention can be automatically centered when it is twisted, so that the rotation centerlines of the two right-angled gaskets coincide with the axes of the square shaft and the square hole.

The invention discloses a highway cold-formed U-shaped composite girder bridge and a construction method thereof. Structurally, a plurality of U-shaped steel plates are spliced ​​into a bridge main steel structure; the U-shaped steel plate is a concrete pouring area, an asphalt layer is laid on the concrete, and the bridge head is arranged Gate frame, guardrails and lamp posts on both sides of the bridge. Compared with the prior art, the U-shaped steel plate of the present invention does not require welding for cold-bending forming, which avoids welding quality problems and welding residual stress; the spliced ​​steel girder segments in the factory are transported to the site, and then concrete is poured to form a bridge. The steel beam segments replace the construction formwork, optimize the construction process, improve the construction quality and shorten the construction period. The flexural bearing capacity of the cold-formed U-shaped composite beam is three times that of the hollow slab beam with the same span, and it can reduce concrete cracking diseases and enhance the durability of the bridge.

The invention discloses a synthetic jet driver based on dielectric elastomer driving. The driver includes a front cavity, an elastic component, a dielectric elastomer film, an intermedium ring and a rear cavity. The front cavity and the rear cavity are hollow shells with one end open and the other end closed, and the intermedium ring is a hollow shell with the two ends open; the closed end of therear cavity is provided with a through hole, the open end of the rear cavity is closely connected with the first open end of the intermedium ring, and the second open end of the intermedium ring is connected with the open end of the front cavity. The second open end of the intermedium ring is provided with a dielectric elastomer film, a first inner cavity is formed between dielectric elastomer film and the front cavity, and a second cavity is formed between the dielectric elastomer film, the intermedium ring and the rear cavity; the elastic component is arranged between the front cavity and the dielectric elastomer film. The synthetic jet driver has very simple overall structure and motion control, very high jet speed and ultra low weight, and has great potential application value in the fields of fluid active control, aerospace exploration engineering and the like.

The invention relates to the technical field of high-precision reducers, and discloses an improved structure of a flexible wheel of a harmonic reducer. The improved structure comprises a rigid wheel and a wave generator; an output disk is movably sleeved with one end of an inner cavity of the rigid wheel; and eight separating strips are arranged on the front side of the output disk, are distributed on the front side of the output disk in a ring array manner and are in sector shapes. According to the improved structure, the traditional flexible wheel is improved to comprise the output disk, theseparating strips and flexible mechanisms, through cooperation with the restoring tension force effect of reset tension springs, the flexible mechanisms are pushed out of the output disk sequentiallyby the aid of the long-axis part of the wave generator, and teeth outside rigid arc plates mesh with inner teeth of the rigid wheel, so that the speed reduction effect equivalent that of flexible wheels in the prior art is realized; compared with the prior art, the improved structure has the advantages that repeated deformation of the flexible wheel is changed into reciprocating sliding of the flexible mechanisms, deformation of the flexible wheel is changed into deformation of the reset tension springs, thus the problem that the flexible wheel is prone to damage due to repeated deformation is avoided, and meanwhile, the reset tension springs are not prone to fatigue damage and are cheap to replace.

The invention relates to a shield besides road to adsorb noise, which comprises a sound adsorption shield and a support frame, wherein the shield plate and the support frame or / and support frame and the base are connected via flexible element or / and damping element, the flexible element and the damping element can be serially, parallel or integrally connected. The invention can improve sound adsorption ability and protect the base, with long service life, less increase on the load of road, and high safety or the like.

The invention discloses a pontoon, a method for using it and a pontoon, and relates to the technical field of pontoons. The pontoon comprises: a plurality of pontoon units movably connected along the bridge, and each of the pontoon units is equipped with suction and drainage component, the suction and drainage assembly is configured to: when the water level outside the floating tank unit rises, the suction and drainage assembly absorbs water into the corresponding floating tank unit to keep the floating tank unit at a preset elevation; when the When the water level outside the floating tank unit drops, the suction and drainage assembly discharges the water in the corresponding floating tank unit to keep the floating tank unit at a preset elevation. The invention can make the mooring device and the telescopic device connected with the floating tank stable in force, not prone to fatigue damage, and is beneficial to the long-term safe operation of the floating bridge.

The invention discloses a production process of a ball pin, and relates to machining technologies. The production process of the ball pin is used for solving the problem that a common ball pin is prone to breakage. The production process comprises the following steps that (1) material selection and blanking are carried out; (2) forging and strengthening are carried out, and specifically a metal raw material in the step (1) is heated to 700-750 DEG C and then undergoes hot forging; (3) rough blank shaping is carried out, and specifically the forged metal is heated to 850-890 DEG C again, and then undergoes rolling shaping by using a die; (4) rough blank grinding is carried out; (5) heat treatment is carried out; and (6) post-processing is carried out. The production process of the ball pinhas the following advantages and effects that the ball pin formed through hot forging and rolling is not prone to crack due to the technological problem in the manufacturing process, then the ball pinis not prone to breakage due to stress concentration at the cracking position in the using process, moreover, the ball pin has relatively high surface hardness while the toughness of the core part isreserved by adopting the forming mode, then the fatigue damage is not prone to occurrence in the using process of the ball pin, and then the breakage is further not prone to occurrence.

The vibration excitation device disclosed by the present invention includes a base, a coil skeleton, an AC coil, a DC coil, an inner sleeve, a spring and an outer sleeve from the inside to the outside of the coaxial line device, and the center hole of the coil skeleton is placed on the positioning boss of the base and fastened to the base, a giant magnetostrictive rod and a positioning block are built in the center hole of the coil frame, one end of the positioning block is in contact with the giant magnetostrictive rod, and the other end is placed in the center positioning concave hole of the inner sleeve . When working, the workpiece is fixed on the base of the excitation device or the bottom surface of the inner sleeve, and the giant magnetostrictive rod is in the mixed magnetic field generated by the AC coil and the DC coil. The telescopic rod produces telescopic deformation along the axial direction, and pushes the positioning block and the inner sleeve to reciprocate and vibrate at high frequency along the axial direction. The vibration excitation device of the present invention has simple structure and good heat dissipation, and high-frequency vibration can be conveniently realized by changing the frequency of the AC power supply, and the vibration frequency can reach 1000-3000 Hz, which can effectively prevent fatigue damage of workpieces.

The invention provides a novel intelligent vibration isolation noise reduction composite structure system and a usage method thereof. The system comprises: a feedback piezoelectricity sensing element, an upper insulation transition layer, an upper flexible electrode, an actuator unit, a lower flexible electrode, a lower insulation transition layer and a piezoelectric sensing element. The feedback piezoelectricity sensing element, the actuator unit and the piezoelectric sensing element are connected with a controller through a line. When one sensor perceives external vibration, the controller adds a control voltage to the electrode coated on electroactive polymer surface according to different controlled objects and a control algorithm so that the actuator performs inverse deformation to control vibration transmission. And the other feedback piezoelectricity sensing element is taken as a feedback element which plays a supervision role. A small block which uses the structure is made to firmly stick on a submarine surface. Because of the inverse deformation, the control actuator can control sound radiation of a submarine. By using the system and the method of the invention, vibration isolation and noise abatement in high, middle and low frequency system can be completed. The system and the method can be widely used in the submarine, aerospace, precise instrument equipment vibration isolation field.

The invention relates to the field of washing machines, in particular to a detergent dispenser. It includes a motor and two delivery pumps. The delivery pump is provided with a liquid inlet and a liquid outlet. The delivery pump includes a cavity and a push rod slidingly arranged in the cavity. The motor drives the push rod to slide through the drive device. The push rod is used for Push the detergent entering from the liquid inlet to the liquid outlet. The driving device includes a reversing wheel driven by a motor. There are two protruding elastic paddles on the reversing wheel. Extend, the elastic paddles correspond to the push rods one by one, one end of the push rod is set on the casing of the delivery pump through the elastic piece, when the motor rotates forward, one of the elastic paddles lifts up the corresponding push rod, when the motor reverses , and the other elastic paddle jacks up the other corresponding push rod. The invention improves the structure of the double-cavity gear pump, improves the stress of the detergent extruded part, ensures its performance, simplifies the structure of the double-cavity gear pump, and saves costs.