40results about How to "Reduce stress and deformation" patented technology

The invention discloses a safety braking method of an automatic escalator, which is characterized by comprising the following steps of: adopting a sensor to detect the abnormal condition of the automatic escalator and/or passengers, transmitting feedback signals of the sensor to a control cabinet to cut off a power supply of a motor for braking, and carrying out locked braking on a chain wheel connected with the motor. In the invention, a double-braking mode is adopted for the occurring abnormal condition of the automatic escalator and the passengers, so that the inverse operation of the escalator is avoided and the safety of the passengers is ensured.

A rigid wave pattern formed on a first side of a substrate in a semiconductor die package. The rigid wave pattern aligns with and overlies the contact fingers formed on the second side of the substrate. When the substrate and dice are encased during the molding process, the rigid wave pattern effectively reduces deformation of and stresses on the dice, therefore substantially alleviating die cracking.

The invention belongs to the field of oil and gas storage and transportation and particularly relates to an arch-top storage tank with a reticulated shell. The arch-top storage tank with the reticulated shell comprises a tank wall, an arch top, a backing plate, a ring plate, ribbed plates and a guardrail. The ring plate is flush with the top end of the tank wall, surrounds the tank wall one circle and is welded with the same. The ribbed plates are uniformly arranged at the bottom of the ring plate along the circumferential direction of the tank wall, and the ribbed plates, the ring plate and the tank wall are welded. The backing plate is arranged on the top surface, corresponding to the ribbed plates, of the ring plate. The arch top is composed of a tank top reticulated shell structure and a cover paved above the reticulated shell, and is supported on the backing plate through a tank top reticulated shell structure support, and the cover is welded with the top end of the tank wall. The guardrail is arranged at the outer edge of the upper portion of the ring plate. Compared with the prior design, bearing area on the top of the tank wall can be enlarged, binding strength of the ring plate and the tank wall and safety margin of the top of the tank wall are improved, and great stress concentration on the top of the tank wall is avoided. The design of the arch-top storage tank is more humanized, and safety coefficient during maintenance and construction is improved.

The invention discloses a car floor welding tool of a rail vehicle. The car floor welding tool of the rail vehicle comprises a platform support, straight guide rails, a driving compression support, a driven compression support, floor support blocks, driving transverse compression heads, driven transverse compression heads, rotation vertical hydraulic pressure arms and a hydraulic pressure driving mechanism. Through the car floor welding tool of the rail vehicle, actions of the driving transverse compression heads for compressing floors transversely and the rotation vertical hydraulic pressure arms for compressing the floors vertically are controlled by a hydraulic pressure system; compression and loosening are finished automatically; the time for clamping is short, so that the working efficiency can be greatly improved; transverse compression forces applied by the driving transverse compression heads to the floors are the same, and the vertical compression forces applied by the rotation vertical hydraulic pressure arms to the floors are also the same, so that the stress deformation of the floors can be alleviated, and the welding quality can be improved; the positions of the driving compression support, the driven compression support and the floor support blocks can be adjusted, and thus the tool is capable of clamping car floors with different specifications and good in adaptability; the tool cost can be reduced.

The invention relates to an integrated bracket for radar cross-section (RCS) test of a large-mass low-scattering target and application of the integrated bracket. The integrated bracket is made of wood with the following properties: the air-dry density is (100-250) kg/m<3>, the air dry hardness is (400-800) Janka hardness (JH), the water content is 8%-15%, and the relative permittivity is not greater than 1.05. The wood with the specific properties (the air-dry density is 100-250 kg/m<3>, the air dry hardness is (400-800) JH, the water content is 8%-15%,and the relative permittivity is not greater than 1.05) is adopted as a raw material to machine the bracket, compared with a foam bracket, the bracket made of the wood as the material has higher hardness and rigidity, the size stability ishigher than that of the foam bracket, the stress deformation is much smaller than that of the foam bracket, and the integrated bracket is suitable for high-frequency-band RCS tests, sensitive to finedeformation, of a Ku waveband, a K waveband, a Ka waveband and the like.

The invention provides a mechanical sealing structure with a honeycomb-shaped groove in the cylindrical surface. The honeycomb-shaped groove is formed in the outer circular end face, namely the cylindrical surface A, of the mechanical sealing structure in the radial direction and circumferential direction of a cylinder. The honeycomb-shaped groove is composed of hexagonal prisms (1), reinforcing ribs (2) in sealed faces and the sealed faces (3), wherein the hexagonal prisms (1) are located right in the middle of the honeycomb-shaped groove, namely an annular groove, and the reinforcing ribs (2) are each in a semi-hexagonal prism shape and integrated with the sealed faces (3). By applying the mechanical sealing structure to existing non-contact mechanical sealing, the advantages of reshaping of the sealed end faces can be brought into play to a higher extent, the sealing and lubricating effects and stability are remarkably improved, and the service life of the mechanical sealing structure is greatly prolonged.

The invention relates to a medical transfer bed which comprises a vehicle body and a movable bed board mechanism installed on the vehicle body, the movable bed board mechanism comprises an upper-layer bed board, a driving roller, a conveying cloth belt and an installation base, the upper-layer bed board is detachably connected to the installation base, and the driving roller is rotationally connected to the installation base; the conveying cloth belt is sleeved outside the driving roller and the upper-layer bed board and is tensioned by the driving roller and the upper-layer bed board; the two ends of the driving roller are detachably connected with a second driving mechanism through a clutch mechanism and are driven by the second driving mechanism to rotate, a limiting piece used for limiting the driving roller in the radial direction is arranged on the installation base, and when the limiting piece and the driving roller are staggered, the driving roller and the installation base can be arranged in a separated mode. The medical transfer bed is provided with the clutch mechanism, so that separation from thesecond driving mechanism is convenient, the driving roller and the upper-layer bed board which are convenient to disassemble are arranged, so that convenient disassembling, replacing and cleaning of the conveying cloth belt are realized.

The invention discloses a multi-way control valve for a hydraulic excavator. The multi-way control valve comprises a left valve body, a right valve body, a left travelling valve coupling, a right travelling valve coupling, a first movable arm valve coupling, a first bucket rod valve coupling, a bucket valve coupling, a rotary valve coupling, a front pump oil inlet, a rear pump oil inlet and an oilreturn opening, wherein the left travelling valve coupling and the right travelling valve coupling are arranged in the left valve body and the right valve body respectively, the left travelling valvecoupling, the right travelling valve coupling, the first movable arm valve coupling, the first bucket rod valve coupling, the bucket valve coupling and the rotary valve coupling achieve traveling, movable arm, bucket rod, bucket and rotary actions through control of a pilot oil way respectively, the left traveling valve coupling, the first movable arm valve coupling and the bucket valve couplingcommunicate through a first series oil way and a first parallel oil way respectively, the first series oil way is connected with the front pump oil inlet and the first parallel oil way correspondingly, the right travelling valve coupling, the first bucket rod valve coupling and the rotary valve coupling communicate through a second series oil way and a second parallel oil way respectively, and thesecond series oil way is connected with the rear pump oil inlet and the second parallel oil way correspondingly.

The invention discloses a prestressed reinforcement reinforcing system used for a dome ring beam and a construction method of the prestressed reinforcement reinforcing system. The prestressed reinforcement reinforcing system comprises an upper layer of prestressed tension structure and a lower layer of prestressed tension structure, and each layer of prestressed tension structure comprises at least one set of prestressed reinforcements. Each set of prestressed reinforcements comprises four prestressed reinforcements which are uniformly distributed in an annular array manner, and each prestressed reinforcement is horizontally arranged in the radial direction of the dome ring beam. All the prestressed reinforcements of each layer of prestressed tension structure are uniformly distributed inthe annular array manner. One ends of the prestressed reinforcements are anchored to the dome ring beam, and the other ends of the prestressed reinforcements are anchored to annular connecting pieces.The construction method comprises the steps of grouping, penetrating and anchoring the prestressed reinforcements on each layer and tensioning the prestressed tension structures on the upper layer and the lower layer in a layered manner. According to the system, the problem that connection of the dome ring beam and a wall body is prone to deforming in the related technology is solved, concrete cracks generated at the joint of the dome ring beam and the wall body are reduced, and therefore the bearing capacity of the reinforced concrete structure is improved.

The invention belongs to the technical field of vehicle components, in particular to an on-vehicle weapon turntable fixing structure. The on-vehicle weapon turntable fixing structure comprises a weapon turntable, a front circular steel tube and a back circular steel tube, wherein the weapon turntable is fixed on the front circular steel tube and the back circular steel tube in a four-point way; the weapon turntable is rigidly connected with the front circular tube through a front suspension bracket; and the weapon turntable is elastically connected with the back circular tube through an adjustable back suspension bracket assembly. By using the fixing structure provided by the invention, when a weapon platform is arranged, the heights of two suspension points on the back part can be adjusted by increasing and reducing gaskets, so that a front fixing surface and a back fixing surface are on the same plane; the turntable cannot be deformed after being tightened; two rubber suspension points on the back part have a buffering effect when the weapon turntable is subjected to compact sent from a vehicle body or the impact of counterforce during shooting of carried weapons; the stress deformation amount of the turntable is reduced; and therefore, the function of the weapon turntable is realized, and the service life of the weapon turntable is prolonged.

The invention relates to the technical field of the Internet of Things, and discloses a school gate security device based on the Internet of Things, which comprises a frame. The right side of the frame is fixedly connected with a partition plate, the bottom of the partition plate is fixedly provided with a console, the upper surface of the console is provided with an induction magnetic sheet, and the top of the frame is welded with a top plate. And a motor is fixedly connected to the interior of the protection box, a protection door mechanism is arranged at the output end of the motor, a bottom plate is arranged at the bottom of the protection door mechanism, and a supporting mechanism is arranged in the bottom plate. According to the school gate security device based on the Internet of Things, when the first plate rotates, a sliding key behind the first plate can also slide in an arc-shaped groove to drive the second plate to rotate, the last fourth plate can be driven to rotate in a reciprocating mode, a door is opened, and the opening mode is set to be a bidirectional fan-shaped opening mode; the school gate opening time can be effectively shortened, waiting for a long time is not needed, the structure is simple, and the device is very practical.

A mounting bracket and structural bridging fastener comprises an angle mounting bracket attached to a stable base, the bracket comprising a substantially planar main body and a mounting plate oriented perpendicular to the main body, the mounting plate and main body being connected through a complex formation in the angle mounting bracket, a loaded subcomponent configured to be attached to the mounting bracket so that the attachment point of the loaded subcomponent is aligned directly with the main body, a fastener comprising a structural portion adapted to lie between and be rigidly fastened to the mounting plate and to the main body adjacent the complex formation, with the fastener further comprising a threaded portion adapted to connect the loaded subcomponent to the mounting plate. The threaded portion may be an extension of the structural portion adapted to receive a nut, or the threaded portion may be internal to the structural portion and adapted to receive a bolt. The mounting bracket and structural bridging fastener is particularly adapted to secure a vehicular steering column assembly to a vehicular cross-car instrument panel structure.

The invention relates to the technical field of mask strip classification, in particular to mask strip classification equipment and a mask strip classification method. The mask strip classification equipment comprises a rack and a moving mechanism, wherein a mask carrying table is arranged on the rack, the moving mechanism is located above the mask carrying table, a mask strip packaging box is placed on the side face, close to the moving mechanism, of the mask carrying table, two or more metal mask strips are placed in the mask strip packaging box, and dust-free paper is arranged between every two adjacent metal mask strips. Two or more adsorption mechanisms are connected to the side face, close to the mask carrying table, of the moving mechanism, mask strip tension mechanisms are arranged at the two opposite ends of one side face of the rack respectively, and an opening measuring mechanism is arranged on the side face, close to the mask carrying table, of the moving mechanism, so that stress deformation of a metal mask frame caused by metal mask strip net stretching contractility is reduced, the net stretching yield and the net stretching precision are improved, errors of the opening position are reduced, and therefore the problems of color mixing and the like of follow-up evaporation are solved.

The invention provides a riding body builder. The riding body builder comprises grips, a saddle, pedals, a flywheel and a damper which are arranged on a frame, wherein the grips are arranged at the front part of the saddle; the pedals are arranged on the flywheel; the flywheel is connected with the damper; the grips are arranged on the frame through a first space regulating mechanism; the saddle is arranged on the frame through a second space regulating mechanism; the first space regulating mechanism comprises a first up-and-down regulating assembly and a first front-and-back regulating assembly; the second space regulating mechanism comprises a second up-and-down regulating assembly and a second front-and-back regulating assembly. According to the riding body builder provided by the invention, the riding requirements of different crowds can be met, regulating of the grips and the saddle in the vertical direction and the horizontal direction can be effectively realized, and the best riding point of a user can be accurately fitted.