39results about How to "Avoid point contact" patented technology

An insertion assisting device includes a rotary body in the form of toroid, and a support and drive part for supporting the rotary body in a rotatable manner and rotating it. The support and drive part has an approximately cylindrical supporting member for supporting the rotary body in a rotatable manner. The rotary body is provided with a convex portion for increasing the thickness to improve the strength thereof. A concave portion having a shape corresponding to the shape of the convex portion is formed on a portion of a front end surface of the supporting member, which is made in contact with the convex portion. The concave portion prevents the rotary body from stopping rotating, which may be caused by point contact between the convex portion and the supporting member.

The invention relates to an electroplating CBN grinding wheel for efficient and precise gear profile grinding. The electroplating CBN grinding wheel comprises a dish-shaped base body and a material grinding area at the edge of the dish-shaped base body, the mass of the material grinding area is 4%-15% of the total mass of the base body, the cross-section of a material grinding layer on the material grinding area is in an isosceles trapezoid shape, and the upper bottom and the two lateral edges are chamfered. A manufacturing method of the electroplating CBN grinding wheel includes the steps of firstly machining the base body of the grinding wheel, and then sequentially conducting negative and positive pole alternative electrochemistry oil removing, clamp and electrostatic adsorption film insulation assembling, negative and positive pole alternative electrolytic treatment, ballistic method preplating, grinding material assembling, thickening and grinding wheel electroplating on the base body of the grinding wheel. The using linear velocity of the electroplating CBN grinding wheel can achieve 250 m/s, and the grinding feeding amount achieves 4 m/min-10 m/min and is much higher than that of a common grinding wheel. The roughness Ra can achieve 0.4 micrometers, the surface quality requirement of a workpiece can be met, and gear efficient and precise gear profile grinding can be successfully achieved.

The invention provides a tower-shaped repairing device of a hotly-rolled steel coil and relates to the technical field of steel coil defect correction. The tower-shaped repairing device comprises lateral pushing mechanisms, a saddle, a power system and a control system, wherein the saddle is used for storing the steel coil; the lateral pushing mechanisms are arranged on the two sides of the saddle respectively. Each lateral pushing mechanism comprises an air cylinder base, an air cylinder, a trolley, a guide rail, a guide rail support, a push plate and a base plate. A cylinder body of the air cylinder is hinged to the air cylinder base; a piston rod of the air cylinder is hinged to the trolley through a U-shaped connector; the trolley can move along the guide rail; an arm of the trolley is connected with the push plate through a floating connection piece. According to the tower-shaped repairing device provided by the invention, the floating connection piece is additionally arranged between the push plate and a driving part, so that point contact between the push plate and the steel coil can be avoided, and the push plate can be completely filled with a convex part of the steel coil all the time in a repairing process, and a movement track of the steel coil is completely fitted; a condition that part abrasion is caused by the fact that a twisting force is transmitted to the driving part is avoided, and labor is saved in a use process of the tower-shaped repairing device.

The invention discloses a rolling disc type working device and a slide revolving support thereof, and belongs to the field of engineering machinery. The device mainly comprises an upper fixed plate and a lower fixed plate; a slide gear ring is arranged between the upper fixed plate and the lower fixed plate; composite slide bearings II and sealing rings are arranged above and below the slide gearring and between the upper fixed plate and the lower fixed plate; a composite slide bearing I is arranged between the inner side of a slide outer gear ring and the lower fixed plate; lubricating oil tanks are respectively formed in the side surfaces, contacted with the upper fixed plate and the lower fixed plate, of the slide gear ring; lubricating holes are formed in the lower fixed plate, and communicate with the lubricating oil tanks; and lubricating oil cups are arranged in the lubricating holes. A sliding end and a fixed end are in surface contact; a lubricating oil film is easier to form; the lubrication is more sufficient; the replacement cost is low; and failed parts are only replaced. The device is mainly applied to a land leveler.

The invention provides a contact mechanism of a switching device capable of realizing three states. The contact mechanism comprises multiple contact units sequentially arranged in parallel, wherein each contact unit comprises a movable contact group and a static contact group; mirror images on the two sides of the central part of the movable contact group symmetrically extend out of a movable contact plate part; each movable contact plate part further comprises a beat type contact and an arc-shaped knife type inserting contact which are fixedly arranged on the two sides of the external end part of the movable contact plate part respectively and have the same orientation; each static contact group comprises two finger-type beat type static contacts and one knife type inserting static contact, and the two finger-type beat type static contacts are arranged on the two sides of the central part of the movable contact group respectively. According to the invention, the contact mechanism can effectively reduce electrical wear generated when a contact is closed or disconnected, enables the rotating angle of the movable contact group to be enlarged to an angle nearly 180 degrees, is very suitable for the switching device capable of switching among three states, effectively avoids the point contact phenomenon caused by machining error and other cumulative errors, ensures contact pressure, and enables a movable contact and a static contact to keep excellent surface contact.

The invention provides a negative electrode, and a preparation method and application thereof. The negative electrode comprises a current collector, a negative electrode active material layer, a slow-release layer and an active lithium layer which are sequentially stacked, the slow-release layer comprises inorganic particles and a binder, and the ionic conductivity of the slow-release layer is smaller than 10<-4> S/cm. The slow-release layer with the inorganic particles is added between the active lithium layer and the negative electrode active layer, so that direct contact between metal lithium and a negative electrode active material before a lithium supplementing process is avoided, and the effect of improving the safety performance of the battery is further achieved.

The invention discloses a movable grain unloading opening mechanism of a combine harvester, a grain unloading device and a harvester, and belongs to the technical field of harvesters. The movable grain unloading opening mechanism of the combine harvester is installed at the tail end of a grain unloading horizontal auger assembly and comprises a radial rotating assembly and an axial swinging assembly. The radial rotating assembly can rotate around the axis of the horizontal grain unloading auger assembly, and the axial swing assembly can swing in the axis direction of the horizontal grain unloading auger assembly. According to the movable (vector) grain discharging opening mechanism, during grain discharging operation, a grain discharging opening can be freely adjusted in the 360-degree direction on the horizontal projection plane, the grain discharging direction can be freely changed, grains can be evenly discharged to all corners of a dragging box of a grain transporting vehicle, the grain discharging operation efficiency of the harvester is greatly improved, the operation cost of the harvester is saved, and potential safety hazards during grain unloading are further eliminated. The movable grain unloading opening mechanism of the combine harvester is simple in principle, reasonable in structural design and convenient to popularize and use.

The invention discloses a hinge type bent positioning support. The support consists of a bent connecting seat, an upper hoop, a limiting pipe and a positioner support; and the bent connecting seat iscomposed of a lower hoop, a supporting arm which is connected to the lower portion of the lower hoop and inclines downwards, and a positioning column connected to the lower end of the supporting arm.One side of the upper hoop is hinged to one side of the lower hoop through a pin, and the other side of the upper hoop is connected with the other side of the lower hoop through a bolt pair. The positioning column is inserted into the upper end of the limiting pipe, and the limiting pipe is fixed to the positioning column through rivets in the radial direction in a riveted mode. The positioner support is sleeved on the limiting pipe. The defects in the prior art are overcome.

The invention belongs to the technical field of valve air pressure test equipment. Aiming at solving the problems that a groove is destroyed and sealing is instable when end face sealing is performedon a welding groove type valve by adopting an existing manner, the invention discloses a valve air pressure test device. The valve air pressure test device comprises a support frame and sealing components; the support frame is provided with two sealing components, and the two sealing components are oppositely arranged at intervals along the same horizontal direction; each sealing component comprises a gland and a support ring; each gland is of a step structure and comprises a first step, a second step and a sealing element, the first step stretches into a port of a valve and performs location,the outer diameter of the second step is larger than the outer diameter of the first step, and the sealing element is located at a position where the first step and the second step are connected; andone end face of each support ring is an inclined plane, an inclination angle is equal to an angle of a groove, each support ring sheathes the corresponding second step, and each inclined plane keepsparallel correspondence with an oblique plane of the groove. The valve air pressure test device disclosed by the invention seals the end face of the valve and can protect the groove and guarantee sealing stability.

The invention aims to provide a high-speed key material taking and placing device. The device is simple in structure, accurate in material taking and placing positioning and capable of ensuring the safety of key materials. The high-speed key material taking and placing device comprises a body and a clamping jaw part (1) which sleeves the body and can move relative to the body, wherein the clamping jaw part (1) comprises a clamping jaw sleeve (11) and at least two clamping fingers (12) arranged at the end of the clamping jaw sleeve (11); X-axis and Y-axis coordinates are established in the longitudinal and transverse directions of the clamping jaw part (1); and the clamping fingers (12) are provided with two opposite curved surfaces in a surrounding shape in the direction of any axis in an XY-axis coordinate system so as to clamp a key material product. The high-speed key material taking and placing device is applied to the processing field of input equipment.

The invention discloses a terminal connection structure of an SFF 2*N series optical module. The terminal connection structure comprises a plurality of terminal modules and at least one conductive column, wherein the plurality of terminal modules are overlapped together, grounding terminals are embedded, molded and fixed on insulating blocks of part of the terminal modules, through holes are formed in fixing parts of the grounding terminals, and elastic sheets are integrally molded and connected to the edges of the through holes; and the conductive column is provided with a contact plane, theconductive column is separated from a signal terminal and penetrates through the through hole, and the elastic piece elastically abuts against the contact plane to be connected in a conducting mode. The grounding terminal is provided with the through hole, the edge of the through hole is connected with the elastic piece in an integrated manner, and each conductive column is provided with the contact plane, so that the grounding terminals and the conductive columns are conducted and connected on the contact planes through elastic extrusion of the elastic pieces, the dimensional tolerance does not need to be controlled quite accurately, the processing cost can be reduced, the contact stability is improved, and the crosstalk problem can be effectively improved.

The invention discloses an efficient steel strand wire stay cable saddle and belongs to the technical field of bridge structures. The stay cable saddle comprises steel strand wires, anchor bearing plates, a sleeve, wire dividing tubes, a filling material and soft metal, wherein the number of the wire dividing tubes is the same as the number of the steel strand wires in the stay cable; the steel strand wires independently pass through the corresponding wire dividing tubes; the periphery of each wire dividing tube is circular; an upper part and a lower part of the inner wall of each wire dividing tube are shaped as arcs with different diameters; the upper part is large, the lower part is small, and a middle part is a special-shaped structure with a diagonal plane; the peripheries of the steel strand wires are coated with a circle of soft metal; the contact area is increased. According to the efficient steel strand wire stay cable saddle, single steel strand wire in the stay cable can be replaced; through a soft metal layer, the stress area of the steel strand wires is increased; meanwhile, the slippage resistance is improved; the slippage of the steel strand wires caused by unbalanced force on two sides of a bridge tower in the operation process of the stay cable can be avoided; the safety of the structure is improved; the efficient steel strand wire stay cable saddle has broad application prospects.