38results about How to "Shock load relief" patented technology

The invention provides a chain tensioning gear and a chain tensioning method for a slag removing machine. The chain tensioning gear is formed by a fixing seat, supporting screw rods, springs, adjusting nuts, slideway supports, a chain, tension sprockets, a sprocket shaft, slide blocks, bearings, a support connecting plate and a screw rod connecting plate. When the stretching and retracting action of a telescopic boom of the slag removing machine is finished, the tension sprockets move downwards under the action of the springs, and are in a free tension state; when the telescopic boom is retracted or stretched, the vertical vibration of the chain can be restrained by the tension sprockets and the meshed chain; when the chain is stretched, the nuts can be adjusted so as to change the precompression of the springs; when a transverse force is caused by the chain, a reserved gap can enable the tension sprockets to move transversely, and transverse floating supporting guide is realized; when a pull force of the chain is changed, the chain does vertical movement along with the tension sprockets, and partial momentary tension is relieved or eliminated. The chain tensioning gear and the method provided by the invention can be used for effectively relieving impact load caused by frequent reversing, the chain transmission stress state can be improved, the service life of the chain can be prolonged, and the running reliability of the chain can be improved.

A weight loaded buffering mechanism features that the left and right connecting rods are symmetrically pivoted to machine frame, their other ends are pivoted via left and right axles to the left and right upper connecting rods, said left and right axles have respective left and right pulleys, and said left and right upper connecting rods are respectively pivoted via middle axle to the spring unit on machine frame. It has a constant buffer action.

The invention discloses a lubricating oil, and belongs to the technical field of chemical engineering. The lubricating oil is used to solve the problems of short service life of present lubricating oils having poor lubrication and anti-wear effects, and high device maintenance cost caused by unable meeting of healthy and stable running of relevant running devices. The lubricating oil comprises a lubricating carrier oil and a copper-based composite powder material uniformly dispersed in the common lubricating carrier oil, a mass ratio of the copper-based composite powder material to the common lubricating carrier oil is 0.01-10:100, and the particle size of the copper-based composite powder material is 0.01-10[mu]m. The invention also provides an application of the lubricating oil in automatic repairing of the worn surfaces of machines. The lubricating oil also has the advantages of strong adhesion, improved anti-wear protection property, improved anticorrosive property, improved self-cleaning property, improved adhesive sealing property, improved vibration damping property and good cooling effect, so the service life of the machines is prolonged, and the maintenance cost is reduced.

The present invention discloses a torque adjustable coupler. It includes the following several portions: driven chain wheel coupled with working machine input shaft, sleeve coupled on the power motor, on the sleeve are successively cover-connected friction disk A, plate type chain wheel, friction disk B, pressure plate, Belleville-type spring and guide plate. The guide plate is connected with a regulation screw by means of a regulation nut, and on the driven chain wheel and the plate-type chain wheel two rows of chains are respectively cover-connected. Said invention also provides the concrete working principle of said coupler. Said invention not only raises the safety reliability of equipment operation, but also raises the working efficiency of said equipment.

The invention discloses an intervertebral disc prosthesis shock absorption structure, which comprises an upper terminal plate, a lower terminal plate and a ball pad, wherein the ball pad consists of a ball body and a connecting post, the ball surface is movably arranged in a ball-shaped groove of the lower terminal plate, the connecting post is movably clamped and buckled in a groove of the upper terminal plate, in addition, a first moving gap is formed in the groove of the upper terminal plate, a second moving gap is formed between the upper terminal plate and the end, far away from the ball surface, of the ball body, and an elastic structure is arranged between the ball pad and the upper terminal plate. The intervertebral disc prosthesis shock absorption structure has the advantages that the intervertebral disc prosthesis has the obvious shock absorption effect, the impact load generated when the human body moves is relieved, and the human body is protected from the injury due to insufficient human body buffer.

The invention discloses a hub unit and an assembling installation method thereof. The hub unit is rotationally installed on a steering knuckle or a vehicle axle tube. The steering knuckle or the vehicle axle tube is in clearance fit with inner rings of two bearings. A plastic deformation spacer bush is arranged in a hub body. The assembling installation method of the hub unit mainly includes the steps that the inner ring of the second bearing is supported on a carrying piece, a press machine is used for applying pressure T1 to the outer end face of the inner ring of the first bearing, the plastic deformation spacer bush generates plastic deformation, the pressure is reduced to T2, the initial rotation torque of the hub unit is detected, when the initial rotation torque is in a preset rangevalue, a product is qualified, and the set range of the initial rotation torque is matched with the set range of a bearing clearance of the hub unit; and the steering knuckle or the vehicle axle tubeis sleeved with the hub unit integrally, and a spindle nose nut is screwed tightly through set fastening torque corresponding to the pressure T2. The bearing clearance is in a reasonable range all the time, the service life of the hub unit is prolonged, and the manufacturing cost can be reduced as well.

The invention discloses a triangular loop chain type bus body structure of a full-bearing pure-electric double-layer tourist bus, which is composed of six sub-assemblies, comprising a front wall, a rear wall, a left side wall, a right side wall, a first-layer underframe and a second-layer underframe, wherein each sub-assembly is of a space truss structure composed of small-section rod pieces; thefirst-layer bottom frame is composed of a first upper-layer framework, a first lower-layer framework and a first supporting piece. The first upper-layer framework is composed of a first upper rectangular supporting main frame, a triangular link chain A and a first upper auxiliary frame; a plurality of small upright posts are arranged at the crossed position of the triangular loop chain A and the first inclined strut group; the second-layer bottom frame is composed of a second upper-layer framework, a second lower-layer framework and a second supporting piece; the second upper-layer framework is composed of a second upper rectangular supporting main frame, a triangular link chain B and a second upper auxiliary frame. Through the design of the triangular loop chain type supporting frame, a force transmission chain in the driving direction is formed, the impact resistance is improved, and meanwhile the longitudinal bearing capacity is improved.

The invention discloses a reactor for degrading oxidative pollutants in a water body by using microorganisms. The reactor comprises a reactor main body and a membrane module, wherein a water inlet is formed in the lower end of the reactor main body; an exhaust opening and a water outlet are formed in the top end of the reactor main body; a water inlet is formed in the bottom end of the reactor main body and is used for introducing hydrogen; the membrane module is arranged inside the reactor main body; the air inlet end of the membrane module is communicated with the gas inlet. According to the reactor for degrading the oxidative pollutants in the water body by using the microorganisms, disclosed by the invention, the hydrogen is introduced and is diffused into water from the membrane module in a foamless form for the microorganisms to utilize; the pollutants in the water and the membrane module are enabled to be in full contact; in addition, the membrane module provides a favorable attaching place for the microorganisms; quick, safe and efficient removal of the oxidative pollutants is realized by controlling the supply level of the hydrogen, hydraulic retention time and a load of pollutants entering the water.

The invention discloses a rolling device of hot-rolled steel channel for a pipe ditch cover plate and a production method. The steel channel comprises a web plate, a first wing plate and a second wing plate, wherein the web plate is rectangular, and two ends of the web plate are respectively connected with the first wing plate and the second wing plate. The rolling device comprises a rolling device body for rolling a hot-rolled steel channel body for the pipe ditch cover plate and a finishing mill for rolling web plate outer side stripes and flange outer side stripes on the hot-rolled steel channel body for the pipe ditch cover plate. The finishing mill is provided with an upper horizontal roller and a lower horizontal roller, and the central axis of the upper horizontal roller and the central axis of the lower horizontal roller are mutually parallel. The finishing mill is provided with a left vertical roller and a right vertical roller, and the central axis of the left vertical roller and the central axis of the right vertical roller are mutually parallel. By the adoption of the technical scheme, the production period of a streel structure production enterprise is shortened, the manufacturing cost of the enterprise is saved, and the stability and rigidity of the hot-rolled steel channel for the pipe ditch cover plate are improved.

The invention provides a valve device, which can well maintain the sealing performance of the valve core part even if a relatively high-pressure refrigerant, such as the CO2 type refrigerant is adopted, and further make an inflating flexible pipe connected with a vacuum pump well removed from a maintenance opening part in a way that the O ring of a pressure bar part will not break. The maintenance opening part (35) is provided with a pressure bar receiving hole (6) having a preset depth and applied for installing and uninstalling the pressure bar part (9) with an O ring (90). The operating end part (500) of a central pin (50) of the valve core (5) is made to face the inner part of the pressure bar receiving hole (6). Meanwhile, in the sealing contact starting end side located inside the pressure bar receiving hole (6) and contacting with the O ring (90) of the pressure bar part (9), an internal-pressure relieving path (63) is equipped on a part where the pressure bar part (9) and the central pin (50) leave. The internal-pressure relieving path (63) allows the axial communication when the O ring (90) is clamped.

The invention discloses a self-balancing suspension structure for a self-balancing scooter. The self-balancing suspension structure mainly comprises a self-balancing rod pole, an air damping shock absorber, a universal connecting rod group, a frame, a base and the like, wherein the self-balancing pole group is of a V-shaped structure formed by movably mounting two prolate self-balancing poles on the base through shaft connection, the other ends of the two self-balancing poles are hinged to the two ends of the horizontally-arranged air damping shock absorber respectively to form a deformable inverted triangle, the universal connecting rod group is composed of two universal connecting rods, and the frame is composed of two U-shaped clamping plates. The suspension structure can relieve impactload transmitted to the frame from an uneven road surface, attenuate vibration caused by the impact load, guarantee the overall stability of a vehicle body, and meanwhile has the advantages of beingsimple in structure, small in occupied space, convenient to disassemble, low in cost, convenient to maintain and good in comprehensive performances.

The invention relates to an electric cylinder, in particular to a hydraulic buffering heavy-load electric cylinder based on disc spring compression and a buffering control method.On the basis of the structure of an original electric cylinder, a buffering device with a disc spring set as a buffering piece is arranged between a nut and a push rod, and the design is small in occupied space and adjustable in buffering rigidity; a hydraulic buffer system is matched, when the loading force is suddenly increased, the influence of impact load on mechanical parts is remarkably reduced by adjusting the swing angle of the variable pump and the rotating speed of the servo motor, and the reliability and the service life of the electric cylinder are improved.

The invention relates to an electric wheel which comprises a rim, a wheel carrier, a damping mechanism, a motor and a parallel eccentric coupler. The wheel carrier is rotationally arranged on the inner ring of the rim. The damping mechanism is arranged on the wheel carrier. The motor is arranged on the damping mechanism, and the damping mechanism allows the motor to generate displacement within aset range in the vertical direction of the use state. The parallel eccentric coupler is arranged between the output end of the motor and the rim, the eccentric distance of the parallel eccentric coupler is variable within a set range, and the parallel eccentric coupler can be eccentric in the vertical direction of the use state. The invention further provides an automobile chassis comprising the electric wheel and a new energy automobile. According to the electric wheel, the automobile chassis and the new energy automobile, the vertical vibration of the motor and the transmission of the driving torque are decoupled through the synergistic effect of the damping mechanism and the parallel eccentric coupler, so that the air gap change of the stator and the rotor in the motor is reduced, the impact load of a road surface on the motor is relieved, and the service life of the motor is prolonged.

The invention discloses a multistage distributed type urban rainwater comprehensive utilization system and a construction method therefor. Firstly, the system divides house buildings, roads and greenbelts into a plurality of independent rainwater collection and utilization subsystems according to different underlying surface types, and each independent rainwater collection and utilization subsystem only needs to treat rainwater in the area to form a distributed type rainwater collection system, so that peak elimination from the source is realized; then excessive rainwater exceeding the storageload of each independent rainwater collection and utilization subsystem is conveyed to large regulation and storage facilities such as an artificial wetland through a pipe duct and a pump station forwater quality improvement and utilization; and finally, all the independent rainwater collection and utilization subsystems are in communication, and excessive rainwater of the distributed unit system is discharged into water bodies such as rivers and lakes for comprehensive regulation and storage. According to the system, the operation pressure caused by centralized rainfall on a rainwater pipenetwork is reduced, the rainwater zoning collection and utilization efficiency and the purification capability are improved, and the urban water environment is improved.

The invention relates to a driving mechanism. The driving mechanism comprises a rack (1), a sleeve (2), a speed reducer (4), at least two connecting plates (5), a drum wheel (7) and traction belts (8). The rack (1) includes a first cover plate (11) and a second cover plate (12); the sleeve (2) is fixed to the second cover plate (12) and internally provided with a driving motor (3); the speed reducer (4) is supported on the sleeve (2) and connected to the driving motor (3); one end of each connecting plate (5) is connected with the first cover plate (11), the other end of each connecting plate(5) is connected with the second cover plate (12), and rocker arms (6) are installed on the connecting plates (5); the sleeve (2) is sleeved with the drum wheel (7) which is connected to the speed reducer (4); one end of each traction belt (8) is connected with the drum wheel (7), and the other end of each traction belt (8) is connected with the corresponding rocker arm (6). The driving mechanismhas a simple structure and can control mechanisms and equipment which are correlated to a spacecraft to be repeatedly unfolded and retracted several times.

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 hydraulic transmission and electromechanical transmission, in particular to an active control vibration reduction system and method based on an electro-hydraulic composite cylinder, the system comprises a reversing valve matched with the electro-hydraulic composite cylinder and an electromagnetic proportional switch valve connected with a rod cavity and a rodless cavity, and by judging the load and the vibration acceleration direction, the active control vibration reduction effect is achieved. The opening degree of the electromagnetic proportional switch valve and rotation of the motor of the electro-hydraulic composite cylinder are controlled, the purpose of relieving impact loads is achieved, the reliability of the electro-hydraulic composite cylinder is greatly improved, and the service life of the electro-hydraulic composite cylinder is greatly prolonged.

The invention discloses a composite punch and a preparation method thereof, and relates to the technical field of dissimilar material welding. The composite punch includes a punch body, an intermediate layer and a substrate welded in sequence. Adding an intermediate layer between the punch body and the substrate can inhibit the formation of brittle compounds at the interface and reduce the hazard of joint residual stress; the thickness of the intermediate layer is from the center to the edge Gradual reduction can not only improve the welding strength of the joint at the edge of the intermediate layer, prevent cracks, but also allow the intermediate layer to absorb more impact loads, relieve the impact force on the composite punch, and make the composite punch better in mechanical properties And longer life. In the preparation method of the composite punch, the diffusion of the intermediate layer is used to complete the welding, which can prevent the formation of brittle intermediate metal at the joint, reduce the difference in linear expansion coefficient between the punch body and the matrix, and obtain a welded joint with good quality and no overheating structure and Heat-affected zone, parameters are easy to control, joint quality and performance are stable during mass production.

The invention relates to a swing arm mechanism capable of sending wall and floor tiles in a reciprocating and swinging mode. The swing arm mechanism comprises a swing arm assembly, a swing arm driving assembly, a base and a wall and floor tile grasping device. The swing arm assembly comprises a swing arm and a swinging wheel disc. The swing arm driving assembly comprises a speed reduction motor, a drive wheel, a guide wheel and a synchronization belt. The total center of gravity of the swing arm assembly and the wall and floor tile grasping device downwards falls from the highest point in the middle to the two sides to be adjacent to mutual symmetric limit positions. The swing arm mechanism is further provided with an air cylinder assisting assembly. The air cylinder assisting assembly comprises an air cylinder and a connection rod. When the total center of gravity of the swing arm assembly and the wall and floor tile grasping device is on the highest point and the air cylinder is located at the working limit position, the air cylinder works, one cavity is emptied and the other cavity is supplied with air. A local segment of the synchronization belt is fixed on the swinging wheel disc. The swinging wheel disc is a complete round wheel or a notched round wheel. The base comprises a shaft, a bearing, a supporting shaft and a fixed base. A swing arm is rapidly and accurately swung by means of a simple structure and a simple control manner, impact loads of the swing arm driving assembly are greatly reduced and the service life of the swing arm mechanism is effectively prolonged.

The invention discloses an unpowered biological rotating cage, a sewage treatment system and a sewage treatment method.The biological rotating cage comprises a supporting base and a vertically-arranged rotating disc, the rotating disc is rotatably arranged on the supporting base, and the biological rotating cage further comprises an annular biological reaction bed; the biological reaction bed is composed of an inner ring shell, an outer ring shell and annular sealing plates, the inner ring shell and the outer ring shell are concentric, the annular sealing plates are used for sealing the two sides of the inner ring shell and the outer ring shell, a plurality of partition plates are arranged in an annular cavity, and all the partition plates are evenly distributed along the circumference of the biological reaction bed to divide the annular cavity into a plurality of reaction cavities; each reaction cavity is filled with a first biological filler, a water collecting plate is obliquely arranged on the outer ring shell corresponding to each reaction cavity, the inclination directions of all the water collecting plates are the same when the water collecting plates rotate to the same position, and a plurality of water passing holes are formed in the four side walls of the reaction cavity corresponding to the inclination direction of each water collecting plate. The device has no energy consumption, is convenient to maintain, and is beneficial to improving the aeration efficiency and prolonging the hydraulic retention time, thereby being beneficial to improving the sewage treatment efficiency.

The invention discloses a self-balancing suspension structure for a self-balancing vehicle. It is a V-shaped structure formed by two flat and long self-balancing rods that are movably installed on the base through a shaft connection. The deformed inverted triangle shape, the universal link group is composed of two universal connecting rods, and the frame is two U-shaped splints. The suspension structure of the present invention can alleviate the vibration caused by the impact load and attenuation transmitted to the vehicle frame by the uneven road surface, and ensure the overall stability of the vehicle body. At the same time, it has the advantages of simple structure, small space occupation, convenient disassembly, low cost and convenient maintenance. , the advantages of good comprehensive performance.

The invention relates to a reverse-flow type horizontal flow hydrogen substrate bio-membrane reactor based on carbon dioxide as a carbon source. The reactor consists of a horizontal rectangular reactor box (5), a water inlet (2), a reflux water inlet (1), an overflow water outlet (9), a reflux water outlet (8), a sludge discharge opening (7), six interfaces (11) with inner threads on a box cover and six membrane assemblies providing H2 and CO2, wherein every two membrane assemblies are one group, third guide plates (6), second guide plates (4) and first guide plates (3) are sequentially arranged among every group of membrane assemblies and between the membrane assemblies and the water inlet (2); and the bottom of the first guide plate (3) is fixedly connected with the inner bottom wall of the reactor box, a channel is reserved in one side of the first guide plate (3), the bottoms of the other two guide plates are provided with channels, two sides are symmetrical and are fixedly connected with the front and back side walls of the box in a staggered manner so as to form symmetrical channels. The reactor disclosed by the invention is good in treatment effect, convenient to operate and maintain and low in cost, and easily treats oxidized contaminants in underground water on a large scale through engineering.

The invention provides a chain tensioning gear and a chain tensioning method for a slag removing machine. The chain tensioning gear is formed by a fixing seat, supporting screw rods, springs, adjusting nuts, slideway supports, a chain, tension sprockets, a sprocket shaft, slide blocks, bearings, a support connecting plate and a screw rod connecting plate. When the stretching and retracting action of a telescopic boom of the slag removing machine is finished, the tension sprockets move downwards under the action of the springs, and are in a free tension state; when the telescopic boom is retracted or stretched, the vertical vibration of the chain can be restrained by the tension sprockets and the meshed chain; when the chain is stretched, the nuts can be adjusted so as to change the precompression of the springs; when a transverse force is caused by the chain, a reserved gap can enable the tension sprockets to move transversely, and transverse floating supporting guide is realized; when a pull force of the chain is changed, the chain does vertical movement along with the tension sprockets, and partial momentary tension is relieved or eliminated. The chain tensioning gear and the method provided by the invention can be used for effectively relieving impact load caused by frequent reversing, the chain transmission stress state can be improved, the service life of the chain can be prolonged, and the running reliability of the chain can be 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 discloses a composite punch and a preparation method thereof, and relates to the technical field of dissimilar material welding. The composite punch comprises a punch body, a middle layer and a base body which are welded in sequence, wherein the middle layer is added between the punch body and the base body, so that formation of an interface brittle compound can be inhibited, and harm of residual stress of a joint can be reduced; and the thickness of the middle layer is gradually reduced from the center to the edge, so that the welding strength of the joint at the edge of the middle layer can be improved, cracks are prevented, the middle layer can absorb more impact load, impact force borne by the composite punch is relieved, and the composite punch is good in mechanical property and long in service life. According to the preparation method of the composite punch, welding is completed by utilizing diffusion of the middle layer, brittle intermediate metal can be preventedfrom being formed at the joint, the difference between the linear expansion coefficients of the punch body and the base body is reduced, the obtained welded joint is good in quality, an overheating structure and a heat affected zone do not exist, parameters are easy to control, and the joint is stable in quality and performance during batch production.

The invention provides a cargo carrying vehicle structure which is applied to the technical field of cargo delivering vehicles. A motor (4) of a vehicle frame (1) of the cargo carrying vehicle structure is connected with a front wheel (2) through a driving shaft. The motor (4) is connected with the other front wheel (2) through the other driving shaft. The motor (4) is connected with a control component (15). Sun wheels (5) of the front wheels (2) are connected with the driving shafts. The sun wheels (5) are fixedly connected with a planetary frame (7). Planetary wheels (6) and rotating wheels (8) are installed on the planetary frame (7). The multiple planetary wheels (6) correspondingly mesh with the sun wheels (5). Each planetary wheel (6) meshes with the corresponding rotating wheel (8). The cargo carrying vehicle structure is simple in structure, attitude of the cargo carrying vehicle structure can be self-adjusted during climbing stairs, stair climbing function can be conveniently and fast achieved, a courier does not need to climb stairs for delivering cargos by himself when delivering express packages, the labor intensity of the courier is relieved, and the delivering efficiency of the express packages is improved.

The invention relates to a mechanical emergency control device for a hydraulic lifting system on an emergency rescue vehicle, which comprises a first cantilever, a second cantilever, a connecting base plate and multiple sets of striker assemblies, the first cantilever and the second cantilever are respectively arranged in The first end and the second end of the connection base plate are connected, the connection base plate includes a first base plate, a second base plate, a third base plate and a fourth base plate, and a plurality of handles are arranged on the connection base plate, and between the first base plate and the second base plate, Between the second substrate and the third substrate and before the third substrate and the fourth substrate are rotatably connected, and a plurality of sets of striker assemblies are respectively arranged on the second substrate and the third substrate. In the present invention, multiple groups of striker assemblies are arranged on the connection base plate, and different striker assemblies are combined through the operating handle, thereby controlling the electromagnetic switch of the electro-hydraulic control cabinet on the emergency rescue vehicle, which is beneficial to realize hydraulic lifting on the emergency rescue vehicle The functions of lifting, loading, handling, braking and emergency stop of the system.

The invention discloses a method for reducing network impact load from an SDN switch to a controller. The connection request of the SDN switch is verified and scheduled before the SDN switch is connected with the controller. According to the scheme, the network impact load formed for the controller due to the fact that a large number of SDN switches instantaneously transmit a large number of connection requests can be reduced, and the capacity of the controller side for processing the concurrent connection requests can be increased.

The invention discloses a rolling device of hot-rolled steel channel for a pipe ditch cover plate and a production method. The steel channel comprises a web plate, a first wing plate and a second wing plate, wherein the web plate is rectangular, and two ends of the web plate are respectively connected with the first wing plate and the second wing plate. The rolling device comprises a rolling device body for rolling a hot-rolled steel channel body for the pipe ditch cover plate and a finishing mill for rolling web plate outer side stripes and flange outer side stripes on the hot-rolled steel channel body for the pipe ditch cover plate. The finishing mill is provided with an upper horizontal roller and a lower horizontal roller, and the central axis of the upper horizontal roller and the central axis of the lower horizontal roller are mutually parallel. The finishing mill is provided with a left vertical roller and a right vertical roller, and the central axis of the left vertical roller and the central axis of the right vertical roller are mutually parallel. By the adoption of the technical scheme, the production period of a streel structure production enterprise is shortened, the manufacturing cost of the enterprise is saved, and the stability and rigidity of the hot-rolled steel channel for the pipe ditch cover plate are improved.

Provided is a fixed type constant velocity universal joint capable of suppressing heat generation under high load and during high-speed rotation to improve durability, and suppressing a contact resistance between a cage and inner and outer joint members to improve the constant velocityproperty. An axial offset amount of a curvature center of each track groove (22) of an outer joint member (23) and an axial offset amount of a curvature center of each track groove (25) of an inner joint member (26) are zero. Track grooves (22a, 22b) of the outer joint member (23) are formed alternately in a circumferential direction to be inclined in mutually opposite directions with respect to an axis, and track grooves (25a, 25b) of the inner joint member (26) are formed alternately in the circumferential direction to be inclined in mutually opposite directions with respect to the axis. An outer surface (24) of the inner joint member (26) is formed into a spherical surface (21b) which is held in slide-contact with an inner spherical surface (28b) of a cage (28). An inner surface (21) of the outer joint member (23) is formed into a cylindrical surface (21a).