207results about How to "Solve the stiffness problem" patented technology

The invention relates to a compliant passive gripper drawn by pneumatic ropes and provided with bent plate spring skeletons. The gripper is provided with two fingers which take bent plate springs as skeletons and grip objects passively through elastic restoring forces of the bent plate spring skeletons; the two fingers are driven by a cylinder; the acting force of the cylinder is increased through a five-hinge skewed double-elbow reinforcement mechanism which is frequently used on an injection machine so as to drive drawing ropes of the fingers, overcome deformation resistance of the bent plate springs and open the passive gripper; and the opening degree of the gripper can be controlled by controlling the pressure of the cylinder. The gripper has the advantages of large driving force, wide applicable range, simple structure, less controlled objects, convenience in maintenance and low requirements on using environment, has the characteristics of flexibility in degree of freedom and resiliency in acting force, has good flexibility in adaptivity, can grip objects with varying shapes and sizes, and belongs to the technical field of application of robots and mechatronics.

The invention discloses a wind tunnel model supporting device which comprises a movable platform, a clamping device, a first driving unit and a second driving unit, wherein the movable platform has three translational freedom degrees and at least one rotation freedom degree. The clamping device is connected with the movable platform and is used for fixing and supporting the model. The first driving unit and the second driving unit are arranged on the movable platform and used for driving the clamping device, and therefore, the clamping device obtains the freedom degrees of rotation in horizontal and transversal directions. The first driving unit comprises a first driving motor and a first rope traction mechanism. The second driving unit comprises a second driving motor and a second rope traction mechanism. The wind tunnel model supporting device with simple and reliable structure can realize six freedom degrees of the model in the wind tunnel test, effectively expand the model pitch and the roll amplitude capable of being realized by model supporting, and decrease the acceleration, the motion speed and the motion travel of the driving units through the first driving unit and second driving unit which are connected in parallel.

The invention belongs to the technical field of the hydraulic pneumatic servo control, and discloses a piezoelectric ceramic direct-driving servo valve based on a hydraulic micro-displacement amplification structure. Piezoelectric ceramic drives a big piston with a hydraulic micro-displacement amplification structure, and an amplified displacement output is obtained on a small piston so as to push the valve plug of a slide valve to move. Compared with the traditional electro-hydraulic servo valve, the piezoelectric ceramic direct-driving servo valve has the advantages that the defect of small output displacement of the traditional piezoelectric ceramic material is overcome due to the displacement amplification action so as to conveniently manufacture a big-flow servo valve; due to the diaphragm-type big position design, the influence on the input displacement and the dynamic response speed of a piezoelectric ceramic driver by the big-mass and big-inertia load of the traditional piston is avoided; the diaphragm-type piston has the advantages of small inertia, high inherent frequency and high dynamic performance; due to the design of an elliptic flexible hinge diaphragm, the intensity requirement and the rigidity requirement are simultaneously guaranteed; and the small piston and the valve plug are not fixedly connected, the coaxiality is easy to guarantee, and the phenomena of rubbing and clamping due to the coaxiality problem of a fixedly-connected structure are avoided.

The mineral/whisker reinforced polypropylene composition consists of polypropylene, mineral reinforcer, toughening agglomarate, PP grafting compatilizer, antioxidant and other assistant and features the addition of /whisker reinforcer. The compounding process includes high speed mixing of the materials except the whisker reinforcer; adding magnesium salt whisker reinforcer and mixing at low temperature; and pelletizing in a special double-screw extruder at 170-240 deg.c and 180-600 rpm. The polypropylene composition has high strength, high rigidity, high impact resistance, high size stability and other features, and may be used in producing parts of automobile, air conditioner, washing machine, etc.

The invention provides a lightweight car body structure, which comprises a core layer (300), a middle layer (200) and an outer layer (100), wherein the core layer (300) is a support framework which is made of aluminum magnesium alloy, the core layer (300) is of a hollow structure of which the section is in a circular, quadrilateral or hexagonal shape; the middle layer (200) is made of plastic, the middle layer is made into a rib structure through a 3D (three dimensional) print technology, and the rib structure is of a honeycomb structure, a mesh structure or a spatial cell body structure; the outer layer (100) is formed by adhering a carbon fiber sheet to the surface of the resin material. In the invention, the weight of the car body is reduced; the high-polymer carbon fiber material and the aluminum magnesium alloy are rationally applied to the structure design of the car body, and properly replace the previous sheet metal structure material; in the condition of guaranteeing the safe strength and rigidity property, the weight of the car body is reduced and the fuel consumption is reduced.

The invention relates to a flexural coupling resonance type vibratory stress relief device and an implementation method thereof. A fixed support table of a workbench of the flexural coupling resonance type vibratory stress relief device is fixed on a base and is provided with a fixed support sliding bearing; a sliding stand is installed on a sliding rail; a sliding stand support bearing is arranged on the sliding stand; one end of a screw rod is connected with the fixed support table, and the other end is connected with a base baffle after penetrating through the sliding stand; the base baffle is provided with a sliding stand setting dial; a motor of the speed-adjustable main transmission system is installed on the base and connected with a reducer through a motor coupling; the output endof the reducer is connected with a universal coupling through a main coupling; the other end of the universal coupling is connected with a workpiece holder; the workpiece holder locks a workpiece; the eccentric weight is installed on the workpiece; and a torsion increasing device is fixed on the sliding stand. The invention can effectively solve the problem that a large-size high-rigidity workpiece can not be easily subjected to vibratory stress relief treatment.

The invention belongs to the field of structural vibration reduction, and in particular, relates to an electromagnetic eddy rotating damper. The electromagnetic eddy rotating damper comprises an outer cylinder, an inner cylinder and a lead screw, wherein the inner cylinder is positioned in the outer cylinder; the outer peripheral surface of the lead screw is matched and connected with a screw nut; the outer peripheral surface of the lead screw is fixedly connected with the inner wall of the inner cylinder; a coil is arranged on the outer peripheral surface of the inner cylinder; an annular permanent magnet is fixed on the inner wall of the outer cylinder, and is corresponding to the coil; a thrust bearing is arranged between the outer cylinder and the screw nut; and a roller bearing is arranged between the outer cylinder and the inner cylinder. The electromagnetic eddy rotating damper can effectively consume the energy of earthquake and wind vibration; in particular, under major earthquake, the damper is more obvious in energy consumption; and the damper is small in size and various in mounting forms.

A pod-shaped support rod throw-away deployment mechanism includes a roller assembly, a frame, a deployment drive device, guide devices, a plurality of groups of throw-away devices and thrust devices.The roller assembly, the deployment drive device and the guide devices are sequentially arranged on the frame. The plurality of groups of throw-away devices are sequentially slidably connected to theguide devices. The thrust devices are mounted on the frame. A pod-shaped support rod is wound on the roller assembly. The deployment drive device drives the pod-shaped support rod to extend to the outer side of the frame. When the throw-away devices are squeezed by the guide devices, the throw-away devices reach the face of the pod-shaped support rod. When the pod-shaped support rod is moved froma predetermined specific position to below the throw-away devices, the throw-away devices are locked to the pod-shaped support rod and moves with the pod-shaped support rod to the outer side of the frame until the throw-away devices are detached from the frame. Through the plurality of groups of throw-away devices and the pod-shaped supporting rod, the pod-shaped supporting rod can have a multi-point connection capability.

The invention relates to an aerodynamic bearing with radial elastic foil, in particular to an aerodynamic bearing provided with radially distributed bump foil and a beam-like structure. The novel aerodynamic bearing with the foil comprises a bearing sleeve, the elastic foil and top layer foil, wherein the elastic foil take the shape of tiles; each foil comprises wavy protrusions in the radial direction of the bearing; the widths and the heights of the protrusions become larger and larger gradually; the elastic foil is uniformly arranged in the circumferential direction of the inner surface of the bearing sleeve; one end of the elastic foil is fixed; the other end of the elastic foil is free, lifted by a certain height and overlapped on the upper surface of the adjacent next foil; the wavy protrusions on adjacent foil are in embedded connection with one another; the bottom planes of grooves of the foil are contacted with one another. Therefore, the bearing has high rigidity and high damping property. During design, the rigidity and the damping property of the bearing can be changed conveniently by changing the shape variation regularity of the protrusions on the foil, so as to improve the load-bearing capacity and the impulsive vibration reducing capability of the bearing.

The invention belongs to the technical field of building engineering, and provides a reinforced concrete hollow superposed two-way dense rib floor and a construction method thereof. The floor is divided into common reinforced concrete and pre-stressed concrete, and is suitable for industrial and civil building floors and roof boards with spans of more than 6 meters. The reinforced concrete hollowsuperposed two-way dense rib floor is assembled into a floor bottom die by using a plurality pieces of prefabricated reinforced concrete (or pre-stressed concrete) ribbed bottom plates, a light or hollow material is arranged on the ribbed bottom plate to reduce the dead weight of the structure, the concrete is poured after the longitudinal and transverse rib beam steel bars are paved, and after the construction and curing is finished, an assembled integral reinforced concrete hollow superposed two-way dense rib floor is formed. According to the invention, the floor is in accordance with the standardization and the modular requirements of the industrial production of the current building, the floor can be produced by using the equipment in most prior factories, and the production process issimple. The prefabricated reinforced concrete ribbed bottom plate is assembled on site, no formwork is needed, only a small amount of supports are needed, so that a large number of formworks and labors are saved.

The invention discloses a bridge pier anti-collision component based on FRP and polyurethane foam filled honeycomb rubber concrete, wherein the bridge pier anti-collision component is arranged on theouter side of a bridge pier lower structure, and the bridge pier lower structure is a bridge pier and road surface connecting structure; the pier anti-collision component comprises an FRP sleeve, a polyurethane foam layer and a rubber concrete layer. The anti-collision component and a bridge pier adopt an integral forming construction technology; the whole anti-collision structure adopts a honeycomb buffer layer and a concrete filling layer, wherein the honeycomb buffer layer is composed of an FRP sleeve, a polyurethane foam layer and a rubber concrete layer. When the component is impacted, animpact buffer area, an impact force deformation area and an impact force constraint area are formed, so that the impact energy is dispersed in the circumferential direction of a honeycomb buffer layer composed of an FRP sleeve-polyurethane foam layer and a rubber concrete layer, and dual protection is conducted on a vehicle and a bridge lower structure. The component is integrally formed, the cost is low, the structure is simple, and later maintenance is facilitated.

The invention provides a rotation-type milling force sensor for measuring torque and axial force. The rotation-type milling force sensor for measuring the torque and the axial force comprises a main body structure; the main body structure is connected with a protection shell; the protection shell is connected with a protection shell cover; the front end of the main body structure serves as a standard knife handle connecting port, the rear end of the main body structure serves as a standard knife tool clamping port, and a cage-type structure in the middle of the main body structure serves as an elastic component of the entire sensor; according to the cage-type structure, on the basis of a curved solid formed after an arc rotates a circle, four couples of gaps symmetrically and evenly distributed in pairs are incised out, so that the curved solid is incised into eight parts; four of the eight parts are each provided with a small platform; and semiconductor silicon strain gauges are pasted at the centers of the small platforms, wherein the semiconductor silicon strain gauges in the axial direction and in the direction perpendicular to the axial direction are connected into a Wheatstone full-bridge for measuring the axial force Fz, and the semiconductor silicon strain gauges which are pasted in the positive and negative 45 degree directions are connected into a Wheatstone full-bridge for measuring the torque T which is imposed on a knife tool in machining. The rotation-type milling force sensor for measuring the torque and the axial force has the advantages of being high in sensitivity, high in rigidity, low in cross interference, high in adaptability and the like.

The invention discloses an inner support expansion fixture of an ultra-thin wall large-scale cylinder type cut workpiece. The inner support expansion fixture of the ultra-thin wall large-scale cylinder type cut workpiece comprises a center shaft, poking wheels and cam plates on the shaft ends of the two sides of the center shaft, a plurality of supporting rollers distributed between a pair of the cam plates in a ring mode and a plurality of elastic rubber rings on each supporting roller, wherein a plurality of first long-strip holes are distributed on the cam plates in a ring arrayed mode in the peripheral direction, the first long-strip holes are symmetrical with one another on a pair of the cam plates, the roller shaft end of each supporting roller extends into the corresponding first long-strip hole, notches are distributed on the peripheral face of each poking wheel in a ring mode, the notches on a pair of the poking wheels are symmetrical, the end portion of the roller shaft of each supporting roller is clamped into the notch corresponding to the supporting roller, and the poking wheels are further provided with driving mechanisms driving the poking wheels to perform rotating movement around the center axes of the center shafts and capable of achieving self-locking. The inner support expansion fixture of the ultra-thin wall large-scale cylinder type cut workpiece solves the technical problem that the cutting machine precision of the ultra-thin wall large-scale cylinder type cut workpiece is improved, and the quality of the ultra-thin wall large-scale cylinder type cut workpiece is improved.

The invention provides a hoisting method for a large-span hinged type herringbone steel arch. The hoisting method comprises the steps of conducting hinge joint connection, setting hoisting points, installing hoisting rings, determining the lengths of hoisting steel wire ropes, hoisting and the like. According to the hoisting method for the large-span hinged type herringbone steel arch, due to integral and multipoint hoisting, the technical problems that hinge pin installation in high attitude is difficult, high in construction cost, low in working efficiency and the like are effectively solved. In addition, due to the facts that two hoists are used for hoisting, multipoint hoisting is adopted, and the hoisting points are set reasonably, the situation that the herringbone steel arch deforms due to lack of rigidity in the hoisting process is avoided. Due to the fact that the hoisting steel wire ropes with suitable lengths are selected, the installation angle of the herringbone steel arch is effectively controlled, and two column feet is made to be positioned on bases easily.

The invention provides a space camera secondary mirror support structure. The space camera secondary mirror support structure comprises a secondary mirror support, a metal insert and a metal flange. The secondary mirror support comprises an inner ring and an outer ring which are concentrically arranged. The inner ring and the outer ring are connected through a plurality of tangential ribs which are evenly distributed. The outer ring is of a carbon fiber composite material laminated board structure, the inner ring is formed by winding a carbon fiber composite material prepreg with the metal insert as a mandrel, the prepreg is divided into bundles in the thickness direction in the process of the last turn of winding, a prepreg bundle is separated out each time an equal division point of the inner ring is passed through, and the ends of the prepreag bundles obtained through division are connected with the outer ring to form the tangential ribs. The space camera secondary mirror support structure overcomes the conflict between high rigidity and low weight; meanwhile, the method that the prepreg is wound and laid with the metal insert as the mandrel and the metal insert and the composite material are solidified together is adopted, and therefore the firm assembly problem of the metal insert and the composite material secondary mirror support is solved.

Provided is a cutting force measurement device based on manganese-copper alloy micro-nano sensitive units. A cutting force measurement unit is arranged between a blade and a cutter pad. The shape and dimension of the cutting force measurement unit are matched with those of the blade and the cutter pad. The cutting force measurement unit is of a sandwich structure and comprises an upper aluminum oxide insulating layer, a lower aluminum oxide insulating layer and a middle component layer. Sensitive resistors based on a manganese-copper alloy material are integrated in the middle component layer. One ends of copper electrodes and one ends of lead circuits communicate with the sensitive resistors based on the manganese-copper alloy material, and the other ends of the copper electrodes and the other ends of the lead circuits communicate with metal welding plates on the side faces of the cutting force measurement unit, so that the sensitive resistors based on the manganese-copper alloy material are connected with a fixed resistor in a signal processing circuit to form a Wheatstone measurement bridge. The cutting force measurement unit adopts am MEMS technology for processing. The cutting force measurement device based on the manganese-copper alloy micro-nano sensitive units has the advantages of good compatibility, high universality and high measurement precision.

The invention discloses a large opening car spoke type cable supported grid structure which comprises an upper chord rigid grid system and a lower chord tensioning cable-strut system. The upper chord rigid grid system is a structure with a large opening in the middle, and the lower chord tensioning cable-strut system comprises a strop and a plurality of radial tensioning cables, wherein the strop is correspondingly arranged below the opening of the upper chord rigid grid system, and the radial tensioning cables are arranged in a car spoke type in the radial direction of the strop. the end portion of each radial tensioning cable is hinged to the strop, a supporting rod is arranged between the radial tensioning cables and the upper chord rigid grid system in the arrangement direction of the redial tensioning cables, and a diagonal web member is arranged between the strop and the upper chord rigid grid system in the ring direction of the strop. By means of the large opening car spoke type cable supported grid structure, the high strength material characteristic of the tensioning cables is fully used, the cantilever stress state of the upper chord rigid grid system is changed to the stress state of an elastic support continuous beam, the rigidity of the overall structure is guaranteed, building material is saved, and the attractive architectural effect is achieved.

The invention discloses a method for changing the support of foundation pit enclosing rib plates, which comprises the following steps of: 1) finishing the construction of a foundation pit enclosing wall; 2) finishing the construction of a foundation base plate; 3) manufacturing a trapezoidal rib plate vertical to the enclosing wall at certain intervals along the direction of the enclosing wall; and 4) constructing an enclosing purlin, wherein the enclosing purlin connects all rib plates into a whole, and the trapezoidal rib plates, the enclosing wall and the foundation base plate are connected through reserved or planted steel bars. The method solves the problem that the support cannot be changed due to insufficient rigidity caused by the loss of a horizontal floor plate, is favorable for constructing infrastructure large-story height floors, can effectively shorten the construction period of a foundation pit, reduces the ratio of the construction period of the foundation pit to the whole construction period, and is favorable for reducing cost.

The invention relates to a filling box with a bottom ventilation net and upper part exhaust holes and a manufacturing method of the filling box, and belongs to the field of building construction. The filling box (1) comprises side frame plates (2), stiffening inner plates (3), a top cover plate (4) and the ventilation net (5), wherein the four side frame plates (2) in end-to-end connection define a rectangular plane; more than one stiffening inner plate is at least arranged in each direction; the stiffening inner plates in different directions are in mutual orthogonality; at least one exhaust hole (6) is formed in the top cover plate; an exhaust net (7) is arranged in each exhaust hole; the top cover plate, the stiffening inner plates and the side plate plates made of nonmetallic materials form a box-shaped structure (8) with an open bottom surface together; the ventilation net is fixed on the bottom of the box-shaped structure in various connecting modes; and the ventilation net and the exhaust nets are made of metal or plastic materials. The filling box provided by the invention has the advantages that the production, the transportation and the installation are very convenient; the mechanical property is good; and a hollow floor slab formed by the product has high reliability, good earthquake-resistant performance and good anti-crack performance.

The invention relates to a reinforcing ring for an automobile panoramic sunroof. The reinforcing ring comprises an upper reinforcing ring and a lower reinforcing ring, wherein a plurality of edges in lap joint to the side wall are arranged on the periphery of the upper reinforcing ring at intervals; first steps, second steps and third steps are arranged on the upper reinforcing ring sequentially; first welding edges and second welding edges are arranged on the lower reinforcing ring sequentially; the first steps are welded with the first welding edges; the third steps are welded with the second welding edges; gluing grooves are formed in the second steps; a yielding hole and four bosses are further arranged at the front end of the upper reinforcing ring; the four bosses are four bolt mounting points for the upper reinforcing ring and a roof front beam; four first mounting bosses are arranged at four corners of the lower reinforcing ring and are four mounting points for front and rear reinforcing brackets; and a plurality of second mounting bosses are arranged on the periphery of the lower reinforcing ring and are mounting points for the sunroof. According to the reinforcing ring for the automobile panoramic sunroof, the problems about the whole automobile stiffness and side wall sharing are solved; and a reinforcing ring structure suitable for the reinforcing ring for the panoramic sunroof is designed accordingly, so that the requirement for the mounting strength of the sunroof can be met, and the torsional stiffness and the torsional mode of a whole automobile can be improved.

The invention discloses a Rockwell sealing ring comprising a main sealing ring and a secondary sealing ring which are parallel to each other, wherein the main sealing ring is connected with the secondary sealing ring in an embedding mode. A groove is disposed at the outer peripheral surface of the main sealing ring, and an elastic ring is embedded in the groove. A sealing main lip is arranged on the inner peripheral surface of the main sealing ring. The invention also discloses a production method of the Rockwell sealing ring. With the advantages of simple structure and convenient processing, the Rockwell sealing ring can enhance processing efficiency and reduce processing cost.

The invention discloses a support method for an aircraft model in a wind tunnel experiment. The method includes the following steps: 1) a wind tunnel and an aircraft model in the wind tunnel are connected and fixed through a spatial rod system, and the wind tunnel is not in direct contact with the aircraft model; and 2) according to requirements of experimental measurement and support system design, the diameter, length, number, material and spatial distribution form of support rods in the spatial rod system are adjusted, thereby realizing optimization of rigidity of an aircraft model supportsystem. By adoption of the support method provided by the invention, the support system further adapts to and meets the requirements of wind tunnel experiment content and measurement, thereby achieving the purpose of improving precision and reliability of pneumatic experiment data, and effectively solving the problems of insufficient rigidity, large flow field interference and complicated system internal force of a support system in a traditional support method, and the support method provided by the invention has obvious advantages and potential of innovative development in the aspect of a wind tunnel experiment, particularly in the aspect of a full-size large-model pneumatic experiment.

The invention relates to a gas-magnetic hybrid bearing for gyro motor use. The bearing comprises a shaft sleeve, a shaft, thrust plates, inner magnet rings, outer magnet rings and nuts. The shaft piercing through the shaft sleeve is coaxial installed inside the shaft sleeve, and two ends of the shaft are coaxially provided with thrust plates that are fastened by nuts. Tiny gaps are kept between the shaft and the shaft sleeve as well as between the thrust plates. A group of outer magnet rings are coaxially arranged on the inner surface of the shaft sleeve, and a group of inner magnet rings corresponding to the outer magnet rings in positions are coaxially mounted on the outer surface of the shaft. And the inner round faces of the outer magnet rings and the outer round faces of the inner magnet rings are of the same polarity, so that the function of a permanent magnetic bearing can be realized. The gas-magnetic hybrid bearing for gyro motor use in the invention has simple structure, scientific design, safety and reliability, and strong practicality. The bearing provided in the invention integrates the advantages of aerodynamic bearings and permanent magnetic bearings, overcomes the friction and wear problems during motor starting and stop in aerodynamic bearings, and also solves the problems of poor system stability and small rigidity in permanent magnetic bearings.

The invention discloses a stable overhanging type double-layer space intelligent cantilever structure system, comprising lattice columns, space cantilever structures, a ring beam and a roof. The lattice columns are lattice columns with rhombic sections, the upper end of each lattice column of the bionic double-layer space cantilever structure imitating dragonfly wings. A movable, limiting and locking balance block is arranged at the end of a main vein of an upper layer space structure in each double-layer space cantilever structure. The ring beam comprises a cantilever upper ring beam, a cantilever lower ring beam and a roof ring beam which respectively serve as a double-layer space cantilever structure upper inner edge, a double-layer space cantilever structure lower inner edge and a roofouter edge, the double-layer space cantilever structures and the lattice columns are annularly distributed, the roof is arranged on the inner sides of the double-layer space cantilever structures, and the lattice columns provide support for the double-layer space cantilever structures and the roof through the ring beam. The cantilever structure is large in span, high in structural safety and stability, low in material consumption and light in dead weight, and breaks through the shape of the cantilever structure.

The invention discloses a mechanical algae removing device for floating algae in water channels. The device comprises a totally rectangular frame; a plane of the frame faces a water flowing direction;the frame is aslant arranged in a manner of left-low and right-high; the top of the frame is fixedly connected with a mounting frame after being bent to the right side; a motor speed reducer is arranged on the right side of the mounting frame; a power output end of the motor speed reducer is in transmission connection with a transmission chain wheel through a driving chain; the driving chain wheel, a first driven chain wheel, a second driven chain wheel and a third driven chain wheel are in transmission connection through at least two traction chains; an algae intercepting mesh is arranged between two adjacent traction chains; spraying systems towards water tanks are respectively arranged in the traction chains on the mounting frame; and the parts, below the motor speed reducer, of the algae intercepting meshes are positioned between the spraying systems and the water tanks. The device has the characteristics of light structure, high rigidity, good stability, convenience for installation and disassembly, high cost performance, excellent algae removing effect and incapability of causing secondary pollution to water sources.