42results about How to "Cantilever short" patented technology

The invention discloses a clamping mechanism which comprises a shell and an oil cylinder installed in the shell, wherein clamping blocks are distributed in the front part of the shell in bilateral symmetry; and the inner side surfaces of the front half parts of the clamping blocks are inner concave surfaces. The clamping mechanism is characterized in that a cylinder barrel of the oil cylinder is centered at the rear part of the shell; the front end of a piston rod of the oil cylinder is articulated with a connecting plate; the left part and the right part of the connecting plate are respectively articulated with the rear ends of the clamping blocks; the front part of at least one cover plate of the shell is symmetrically provided with guide grooves left and right; guide pins are arranged in the middle parts of the two clamping blocks and inserted into the guide grooves; fixed blocks are clamped and fixed in the middle parts of the front ends of the two cover plates, and the normal lineof the surfaces of the front parts of the inner concave surfaces of the two clamping blocks are inclined to the directions of the fixed blocks. The invention has simple structure, high strength and large clamping force and can be suitable for different pipe columns with the external diameter range of 3.5-9.75 inches without replacing the clamping mechanism, and the clamping mechanism can not interfere with the adjacent pipe column during working.

The invention relates to a ground-anchored-self-anchored suspension combined system bridge which belongs to the technical field of constructional engineering and particularly relates to a design of a long-span bridge under a complex geologic condition in bridge engineering. The ground-anchored-self-anchored suspension combined system bridge is characterized in that after a tower and a lateral hole pier are constructed, a concrete main girder of a cable-stayed bridge begins to be assembled through a cantilever; after the cantilever is assembled to a lateral hole, a main cable is suspended, one end thereof is anchored on a permanent anchor block, the other end thereof is anchored on a concrete girder external anchor block, and the anchor blocks are pulled on a temporary anchor through temporary anchor cables; the end of a main girder provided with the permanent anchor block is horizontally supported on a bridge abutment; each segment of a main steel girder in a span is hoisted through a cable crane; after folding, the temporary anchor cables are dismantled in batches, and the main cable is completely anchored at the end part of the main girder to finish the system switching from the temporary anchor to a self-anchor. The invention has the effects and advantages that material performance is fully exerted, and by aiming at the complex geologic condition, the huge anchor is saved, the construction cost is lowered, the construction period is shortened, and the risk in the construction process is reduced.

The present invention discloses a laser pipe cutter with 3D bevel cutting function and a control method; a spindle box and a front chuck are both installed on a same pair of linear guide rails of a main machine tool, to maintain and adjust the spindle box and the front chuck concentrically; the spindle box and the front chuck are used to clamp a pipe, so that the pipe, the spindle box, and the front chuck rotate synchronously; the clamping jaw of the spindle box is configured to clamp the pipe to move along the X axis of each linear guide rail, and the rollers of the front chuck are configuredto support the pipe, so that the pipe smoothly moves along the X axis under the support of the front chuck roller, at the same time, the front chuck can also move along the X axis to keep away from the laser cutting head when the pipe 3D bevel is cut; a 3D laser cutting head is installed on the bottom plates of the upper and lower mechanisms on the Z axis; by controlling the motion of the upper and lower mechanisms on the Z axis, the bottom plates of the upper and lower mechanisms on the Z axis and the 3D cutting head move up and down; in the present invention, the 3D bevel of the pipe is cutthrough 5-axis interpolation motion, and the pipe tail material is shortened in length and even the tail material is absent from the pipe.

The invention provides a replaceable built-in movable tip, comprising a base shell, a front end cover, a rear end cover, a tip shaft arranged in the base shell and a tip head arranged on the tip shaft, wherein, a cylindrical ball bearing is arranged between the front end of the tip shaft and the base shell; the rear end of the tip shaft is provided with a needle roller bearing and a deep groove sealing bearing; one side of the cylindrical ball bearing is provided with an adjusting cushion; a pushing force centering ball bearing is arranged between the step surface of the middle part of the tip shaft and the step surface matched with the internal side of the base shell; the rear end surface of the pushing force centering ball bearing is uniformly provided with at least three groups of elastic components; the tip head is a replaceable and movable component and fixed on the tip shaft by tightening screws. The replaceable built-in movable tip has an extension end with short cantilever, good rigidity, long service life, large bearing weight, high precision, good processing technology and replaceable tip head, facilitates the replacement and maintenance, saves the middle bracket, greatly reduces the production cost, and improves the market competitiveness of the enterprises.

The invention relates to a construction method of a high-pier large-span bridge steel mixing beam in a mountainous area. The construction method comprises the following steps that a steel mixing composite beam is prefabricated in a rear field, the prefabricated structure is optimized, a steel box girder and a concrete bridge panel are ensure to be subjected to force to resist the large cross-pathbeam body down-warping; detachable telescopic joints are additionally arranged on a front supporting leg and a rear supporting leg of a bridge erecting machine, and the bridge erecting machine can adapt to the erection of the bridge with slope below 4%; when the bridge erecting machine passes through holes, a girder transporting vehicle is connected through a crown block as the counterweight, so that a cantilever of the bridge erecting machine can be shortened, and the weight of the whole machine is reduced; and transverse moving wheel sets are arranged below a support in the bridge erecting machine, so that beam sheets can be transversely moved through a full-width machine, and accurate positioning and butt joint of the same-hole multi-piece beams can be realized. According to the construction method, the erection efficiency of the steel mixing combined beam can be effectively improved, the positioning precision and the assembling quality of the steel mixing combined beam are guaranteed, and the steel mixing combined beam is promoted to be applied in the mountainous area high pier large-span bridge.

The invention provides a vehicle-mounted operation type tyre disassembling and assembling machine, which comprises a machine body, wherein a center upright post is mounted on the machine body; a cantilever is matched with the center upright post in a sliding fit way; and the cantilever is provided with a lifting sleeve which is fixed relative to the center upright post by a locking structure. The vehicle-mounted operation type tyre disassembling and assembling machine is characterized in that the cantilever comprises a rear cantilever and a front cantilever; the rear cantilever is rotatably connected to a cantilever support pillar; the front cantilever and the rear cantilever are connected by a first connecting sleeve; the front of the rear cantilever is provided with a pivot which is vertical to the axis of the cantilever; the front section of the rear cantilever and the rear section of the rear cantilever are rotatably connected by virtue of hinge joint of the pivot; a tyre disassembling pawl is arranged on the front cantilever; and the tyre disassembling pawl penetrates and sleeves the front cantilever in a slidable way through a second connecting sleeve. An operator can easily realize the disassembly and assembly between tyres of various models and a hub by virtue of the vehicle-mounted operation type tyre disassembling and assembling machine; the use is convenient and flexible; space is saved; and the machine can be conveniently and flexibly used in a narrow carriage.

The invention relates to the paper matrix industry, in particular to a paper matrix loading and unloading material manipulator with a stable pick-and-place part mechanism. A pick-and-place adaptive part adapting to the shape of a wet paper matrix can contact and absorb the wet paper matrix preliminarily molded on paper matrix molding equipment more quickly, thereby reducing the risks of paper matrix dropping out and greatly improving the production yield of the paper matrix, the paper matrix loading and unloading material manipulator can absorb the wet paper matrix with negative pressure through negative pressure suction holes to avoid the occurrence of faulty products caused by clamping deformation and the like, and then the production efficiency of the paper matrix is greatly improved.

The invention relates to a flexible rotor of an ultrahigh-rotating-speed liquid hydrogen turbine pump. The flexible rotor comprises a screw (1), an inducer (2), a compression nut (3), a shaft (4), a primary centrifugal wheel (5), a metal rubber damper (6), a squirrel-cage elastic support (7), a bearing pair (8), an interstage shaft sleeve (9), a secondary centrifugal wheel (10), a balance piston (11), a metal rubber damper baffle (12), a first shaft sleeve (13), a turbine disc (14), a large nut (15), a preloaded disc spring (16) and a second shaft sleeve (17). The shaft system of the flexiblerotor extends outwards in two directions, connection and torque transmission structures are optimized, the mass of the rotor is reduced, cantilevers on the two sides and the supporting span are shortened, supercritical work is achieved, the rated rotating speed reaches 80000 rpm, the critical rotating speed margin is 20% or above, and meanwhile the flexible rotor has 60%-100% variable working condition and axial force self-adaptive balance capacity.

The invention discloses a portal vertical machining center which comprises a lathe body, wherein a portal frame and a base are arranged on the lathe body; the portal frame spans the base; first guide rails in the horizontal direction, which are perpendicular to a plane where the portal frame is located, are arranged on the base; a working platform capable of making X-axis movement along the first guide rails is mounted on the first guide rails; second guide rails in the horizontal direction are arranged on a cross beam of the portal frame; a saddle capable of making Y-axis movement along the second guide rails is mounted on the second guide rails; third guide rails in the vertical direction, which are perpendicular to a plane where the working platform is located, are arranged on the saddle; and a spindle box capable of making Z-axis movement along the third guide rails is mounted on the third guide rails. The portal vertical machining center is good in rigidity and stability, and high in machining precision, and has very good market popularization prospects.

A multi-tower cable-stayed bridge comprises two big-umbrella-shaped structural systems on the two sides and a small-umbrella-shaped structural system in the middle. Each big-umbrella-shaped structural system comprises a side tower, a big-umbrella mid-span main beam, a side-span main beam, mid-span stay cables and side-span stay cables, wherein the big-umbrella mid-span / side-span stay cables are connected with the side tower and the mid-span / side-span main beam. The small-umbrella-shaped structural system comprises a middle tower, small-umbrella main beams and small-umbrella stay cables, wherein the small-umbrella stay cables are connected with the middle tower and the small-umbrella main beams. In the construction process, firstly, the side tower, the middle tower and the like are constructed first; then, the big-umbrella mid-span main beam and the side-span main beam are symmetrically constructed, wherein beam sections without supports like auxiliary piers are constructed with a cantilever construction method, and beam sections with supports like auxiliary piers are constructed with a support cast-in-place or hoisting method; finally, the main beams of the big-umbrella-shaped structural systems and the small-umbrella-shaped structural system are constructed to a final closure at the same time, and final closing is performed to achieve the finished bridge state. The multi-tower cable-stayed bridge has the advantages of being high in system rigidity, high in construction safety and the like.

The invention discloses a rotation paddle type water turbine paddle operation mechanism. A runner body is included and provided with at least three blades. A rocker connected with the blades is arranged in the runner body. The center of the runner body is provided with a piston mechanism with a sliding block. The sliding block is connected with the rocker. An operation oil pipe is arranged at thecenter of the piston mechanism. The two ends of the piston mechanism are provided with a short shaft and a main shaft which are connected with the runner body correspondingly. The rotation paddle typewater turbine paddle operation mechanism has the advantages that structure design is ingenious, usage is reliable, and cost is low; meanwhile, by means of the rotation paddle type water turbine paddle operation mechanism, the paddle motion track can be opened in a limited manner in the preset range; friction pairs are reduced, and the transmission efficiency is higher; the arrangement of the number of water turbine rotation part components is reduced; the occupied structure space is reduced, and the structure is more compact; the runner body is simplified to be only provided with an outer layer instead of an inner layer and an outer layer, and the casting and machining difficulty is lowered; and the design and manufacturing period is shortened, and cost is reduced.

Disclosed is a forced circulation axial flow pump. The forced circulation axial flow pump is structurally characterized in that a mechanical sealing device and a guide bearing are installed at the position, close to the impeller end, of a pump shaft in sequence. The guide bearing is located in a supporting pipe. A shaft cantilever is shortened through supporting of the guide bearing for the pump shaft. The stability of a rotor part is enhanced, and the service life of the equipment is prolonged. The mechanical sealing device completely isolates the shaft from a conveying medium. Wear and corrosion of the shaft are effectively prevented, and the maintenance cost of the equipment is reduced. A pump cover, a bearing body and the pump shaft form a whole to be connected with the pump body. Therotor part can be completely pulled out, disassembly, assembly and repair are convenient, and time and effort are saved. Through holes are formed in the pump cover and the supporting pipe and connected with a sealing flush interface, cooling and lubrication functions on the shaft and the guide bearing can be achieved by inputting flushing liquid through the interface, and mechanical breakdown of the rotor part caused by temperature change is reduced. An in-out opening of a pump body is designed into a 90-degree bent head form, the forced circulation axial flow pump can be directly connected toa pipeline, any support is not needed, and installing is fast and convenient.

The invention provides a vapor-liquid separator and a compressor. The vapor-liquid separator comprises a shell, a swash plate, a supporting pipe and a gas outlet pipe, wherein the shell defines a cavity, and an inlet and an outlet communicating to the cavity are formed in the first end of the shell; the swash plate is mounted in the cavity and is located below the outlet and the inlet; the supporting pipe is fixedly mounted in the cavity and extends in the height direction of the cavity, and the supporting pipe is located on the side, far away from the inlet, of the swash plate; and the gas outlet pipe is mounted in the supporting pipe and extends in the length direction of the supporting pipe, a flow guiding gap is formed between the outer wall of the gas outlet pipe and the inner wall ofthe supporting pipe, the end, far away from the outlet, of the gas outlet pipe communicates to the flow guiding gap, and the end, close to the outlet, of the gas outlet pipe communicates to the outlet. The span of the gas outlet pipe and the supporting pipe is small, so that the cantilever is small, and vibration resistance of the vapor-liquid separator can be improved effectively.

The invention discloses automatic detection and sorting equipment for inner and outer diameters of wire drawing dies. The automatic detection and sorting equipment comprises a rack, a vibration disc, an automatic feeding device, a detector, an automatic discharging device and an automatic sorting device; the wire drawing dies are arrayed by the vibration disc and then are conveyed into the detector through the automatic feeding device; after the inner and outer diameters of the wire drawing dies are detected by the detector, the wire drawing dies are discharged by the automatic discharging device and then are conveyed into the automatic sorting device; and the automatic sorting device is used for distributing the wire drawing dies into preset sorting boxes. By virtue of the automatic detection and sorting equipment, the automatic detection of the inner and outer diameters of the wire drawing dies and the sorting can be realized; the sorting efficiency and the sorting accuracy are improved, and the sorting error rate is reduced; and manpower is reduced and the manpower cost is reduced. Furthermore, the invention discloses an automatic sorting method for the inner and outer diameters of the wire drawing dies. The automatic sorting method can be used for replacing current manual sorting based on the automatic detection and sorting equipment, so that the sorting efficiency and accuracy are improved.

A foot type stand column and short cantilever five-axis linkage machine tool comprises a base of the machine tool, an X-axis linear movement motor, a Y-axis linear movement motor, a Z-axis linear movement motor, a cross-shaped sliding table, a rotating table, a swing motor, an electric main shaft and a foot type stand column. The foot type stand column is arranged on the base of the machine tool and located on one side of the cross-shaped sliding table, the foot type stand column comprises a vertical section and an installing base, the lower end of the vertical section is arranged at one end of the installing base, the middle of the vertical section in the height direction is of a hollow structure and forms a Z-axis movement channel, and a V-shaped through hole is formed in the middle of the installing base in the width direction; the Z-axis linear movement motor is arranged at the top of the vertical section of the foot type stand column, a speed reducer is installed at the front end of a Z-axis drag plate and connected with the swing motor through a coupler, the electric main shaft is installed at the output end of the speed reducer, the Y-axis movement motor is installed on the base of the machine tool and located in the V-shaped through hole in the installing base of the foot type stand column, and the X-axis movement motor is arranged on the upper surface of the crossed-shaped sliding table. The machine tool is mainly used for machining large parts large in height, high in rigidity and suitable for machining hard materials.

The invention discloses an automatic sorting device of a wire drawing die. The automatic sorting device comprises a machine frame, a conveying belt and at least one sorting unit. Each sorting unit comprises a supplied-material detection sensor, a pushing device, a discharging guide tank, a rotating separating device and a sorting disc, and the conveying belt, the supplied-material detection sensors, the pushing devices and discharging guide tanks are installed on the machine frame. Each rotating separating device comprises an installation base, a support, a hopper, a separating tank and a rotating separating power device, wherein the support is installed on the installation base in a rotary mode and driven by the rotating separating power device, the hopper and the separating tank are installed above and below the support respectively, the separating tank is communicated with the hopper, and the hopper is located below the corresponding discharging guide tank. Each sorting disc is located below the corresponding separating tank and comprises a base and a plurality of sorting boxes, wherein the sorting boxes are installed on the base and annularly distributed, and the rotating centers of the separating tanks are coincident with the annular centers of the sorting boxes. The supplied-material detection sensors, the pushing devices and the rotating separating devices are connected with a control system. By means of the automatic sorting device, the sorting efficiency is improved.

The invention discloses a rudder-controlled jet double-rotor aircraft and belongs to the technical field of an aircraft. The rudder-controlled jet double-rotor aircraft consists of a power cabin, an upper rotor, a lower rotor, a power device, a rudder controlling device, bearing wheel trains, a load cabin and the like. The upper rotor is located above the power cabin and the lower rotor is locatedunder the power cabin. Nozzles of a rudder controlling system are located between the upper rotor and the lower rotor and are distributed on the outer circumference of the power cabin. Bearing wheeltrains are distributed on the upper and lower circumference of the power cabin and maintain contact with the upper and lower rotors to bear axial load of the upper and lower rotors. The power device drives the upper rotor and the lower rotor to rotate with equal speed in the opposite direction and lift power and location and pose controlling thrust required by an aircraft are produced, size and direction of the controlling thrust are changed by a rudder machine. The rudder-controlled jet double-rotor aircraft has high engine driven performance and facilitates control of flight and landing in complex space; meanwhile, the rudder controlling device is simple in mechanism, compact in structure and has the independent power cabin and load cabin, and is high in safety.

The invention discloses a clamping mechanism which comprises a shell and an oil cylinder installed in the shell, wherein clamping blocks are distributed in the front part of the shell in bilateral symmetry; and the inner side surfaces of the front half parts of the clamping blocks are inner concave surfaces. The clamping mechanism is characterized in that a cylinder barrel of the oil cylinder is centered at the rear part of the shell; the front end of a piston rod of the oil cylinder is articulated with a connecting plate; the left part and the right part of the connecting plate are respectively articulated with the rear ends of the clamping blocks; the front part of at least one cover plate of the shell is symmetrically provided with guide grooves left and right; guide pins are arranged in the middle parts of the two clamping blocks and inserted into the guide grooves; fixed blocks are clamped and fixed in the middle parts of the front ends of the two cover plates, and the normal line of the surfaces of the front parts of the inner concave surfaces of the two clamping blocks are inclined to the directions of the fixed blocks. The invention has simple structure, high strength and large clamping force and can be suitable for different pipe columns with the external diameter range of 3.5-9.75 inches without replacing the clamping mechanism, and the clamping mechanism can not interfere with the adjacent pipe column during working.

An open discontinuous vane pump comprises an impeller with open discontinuous vanes, an inlet port ring, a drive port ring, a pump casing and the like. The impeller of the open discontinuous blade, its impeller saves the front and rear cover plates, its blade is discontinuous, divided into driving blade and driven blade, the blade form can be radial straight blade form, arc curved blade form or It is in the form of double inclined blades. The driving blades are fixed on the driving disk, and the driven blades are fixed on the driven ring. The driving disc is driven by the drive shaft to rotate at high speed, the minimum outer diameter of the driving disc is larger than the inner diameter of the pump inlet, and the largest outer diameter is smaller than the outer diameter of the blade; the inner diameter of the driven ring is equal to the inner diameter of the pump inlet, and the outer diameter is equal to the outer diameter of the driving disc. The driving disc and the driven ring are connected by connecting arms; the driving disc is matched with the driving port ring installed on the rear pump cover, and the driven ring is matched with the inlet port ring installed on the pump casing. The impeller of the present invention saves the front and rear cover plates of the impeller and some blade materials, which can reduce the deflection of the shaft and the bearing load, ensure the service life and save materials; and the open discontinuous blade impeller reduces the disc loss, and the solid phase particles are mainly concentrated In the vaneless area of ​​the impeller, the open blades can reduce the pressure of the shaft seal cavity and prevent crystal particles from entering the shaft seal cavity. At the same time, the driving disc and the driven ring are matched with the pump casing to reduce volume loss, improve pump efficiency, and reduce pump pressure. impeller cost.

The invention relates to a gantry type manipulator removable spinal surgery robot. The gantry type manipulator removable spinal surgery robot comprises an operation table, X-direction guide control devices are arranged on two sides of the operation table in pairs, main swing arms are installed on the X-direction guide control devices through a main connecting base, main push bars are further installed on the main connecting base, each main push bar is connected to the lower end of each main arm to push the main arm to swing, the upper end connected with the main swing arms, of the main connecting base is connected with main positioning locks, a Y-direction guide device is further connected onto the main swing arms, a Z-direction guide control device is connected onto the Y-direction guide device, and main gantry manipulators are formed. The robot can map the surface coordinates of vertebrae in vitro, which is convenient to collect coordinate data of the bone surface accurately and rapidly, random switching of orthopaedic powder, pliers, soft tissue resection tools and other instruments can be realized through a drum instrument bank under the condition of 'heavy load', and precision operation of various different spinal surgery can be completed in the whole process; the advantages of large bearing capacity, good rigidity, dexterous structure, strong expansibility and the like are achieved.

A forced circulation axial flow pump, its structural feature is that a mechanical seal device and a guide bearing are sequentially installed on the pump shaft close to the end of the impeller; The stability is enhanced, which prolongs the service life of the equipment; the mechanical seal device completely isolates the shaft from the conveying medium, effectively prevents the wear and corrosion of the shaft, and reduces the maintenance cost of the equipment. The pump cover, the bearing body and the pump shaft form a whole and are connected to the pump body. The rotor parts can be completely pulled out, which is convenient for disassembly and maintenance, saving time and effort. There are through holes on the pump cover and the support pipe, which are connected to the seal flushing interface, and the flushing fluid input through the interface can cool and lubricate the shaft and guide bearing, reducing the mechanical failure of the rotor parts due to temperature changes. The pump body is designed in the form of a 90° elbow between the inlet and outlet of the pump, which can be directly connected to the pipeline without any support, and the installation is quick and easy.

The invention relates to the paper model industry, in particular to a full-automatic feeding and discharging intelligent manipulator for a paper model. During standby, a wet model jig can be retractedto the position under a lifting bracket, the number of cantilevers of the wet model jig is decreased as much as possible, thus the load borne by the lifting bracket is decreased, and structure stability is enhanced; and in the same way, during standby, a dry model jig can be retracted to the position under the lifting bracket, the number of cantilevers of the dry model jig is decreased as much aspossible, thus the load borne by the lifting bracket is further decreased, and structure stability is enhanced. In addition, a vertical lifting mechanism uses a lead screw mechanism and is driven bya driving motor, the brake load of the motor can be decreased, and the precision is higher by using lead screw transmission; and by adopting a large-diameter small-lead lead screw, the certain self-locking effect is achieved, and the safer and more reliable effects are achieved.

The invention relates to a pneumatic brake cylinder and a brake clamp unit. The pneumatic brake cylinder comprises a cylinder body and a front end assembly; the cylinder body is internally provided with a piston assembly; a piston sleeve is connected with the piston assembly; a lead screw is arranged in the piston sleeve, and one end of the lead screw is connected with the front-end assembly; a relieving spring is arranged between the cylinder body and the piston assembly; one end of an adjusting spring crimps the piston assembly, and the other end crimps the lead screw; an adjusting nut is arranged on the outer side of the lead screw; one side of the adjusting nut is provided with conical surface teeth; the other side of the adjusting nut is provided with a thrust bearing in contact with the piston sleeve; a conical tooth ring is sleeved on the lead screw and is matched with the conical surface teeth; a pushing ring is arranged on the piston sleeve; one end of the force transmission pipe is in contact with the bevel gear ring; the other end of the force transmission pipe is connected with the piston assembly through a gap identification spring sleeving the lead screw; a clearance identification ring is sleeved on the force transmission pipe and is in sliding connection with the piston sleeve; one end of the buffer spring is in compression joint with the bevel gear ring; and the other end of the buffer spring is in compression joint with the pushing ring. The pneumatic brake cylinder and a brake clamp unit are short in gap adjusting time and high in efficiency.

The invention provides a replaceable built-in movable tip, comprising a base shell, a front end cover, a rear end cover, a tip shaft arranged in the base shell and a tip head arranged on the tip shaft, wherein, a cylindrical ball bearing is arranged between the front end of the tip shaft and the base shell; the rear end of the tip shaft is provided with a needle roller bearing and a deep groove sealing bearing; one side of the cylindrical ball bearing is provided with an adjusting cushion; a pushing force centering ball bearing is arranged between the step surface of the middle part of the tipshaft and the step surface matched with the internal side of the base shell; the rear end surface of the pushing force centering ball bearing is uniformly provided with at least three groups of elastic components; the tip head is a replaceable and movable component and fixed on the tip shaft by tightening screws. The replaceable built-in movable tip has an extension end with short cantilever, good rigidity, long service life, large bearing weight, high precision, good processing technology and replaceable tip head, facilitates the replacement and maintenance, saves the middle bracket, greatlyreduces the production cost, and improves the market competitiveness of the enterprises.

The invention discloses a pedaling and stepping device for an automobile and the automobile. The automobile includes a fuel tank and a vehicle frame. The fuel tank is arranged on the vehicle frame through a fixing bracket. The fuel tank cable tie is arranged on the fuel tank, and the pedal step fixing device includes a transition frame and a step frame, and the transition frame is arranged on the fuel tank cable tie; the step frame is connected with the transition frame, and the The stepping step is installed on the stepping frame. The stepping frame in the pedaling device of the present invention has simple structure, short cantilever, light weight, no shaking, and can reduce the weight of the whole vehicle at the same time. At the same time, when the fuel tank is moved forward, the space between the pedals and the frame can be effectively utilized to increase the volume of the fuel tank and release space on the side of the frame. The wheelbase can also be shortened accordingly, reducing the length of the tractor frame and reducing the cost.

The invention discloses a combined-wing aircraft belonging to the technical field of aircrafts. The aircraft includes a fuselage, a rotor, fixed wings, a power distributor, a supercharger, rudder control nozzles and a drive shaft. The rotor, the power splitter and the supercharger are arranged above the fuselage. A support wheel of the rotor is arranged on the circular orbit of the supercharger. The fixed wings are arranged on both sides of the fuselage and below the rotor. The rudder control nozzles are arranged on the fixed wing on both sides of the fuselage and at the tail of the fuselage,and the drive shaft is connected to the power distributor and a power device in the fuselage. The power distributor drives the rotor and an impeller of the supercharger to rotate reversely at non-equal speeds to generate a pulling force and a high-speed airflow required by the aircraft. The high-speed airflow is ejected from the nozzles to generate an aerodynamic force, and the rudder control nozzles change the size, distribution and direction of the aerodynamic force to realize the attitude control of the aircraft. The combined-wing aircraft of the invention has advantages of both rotor aircrafts and fixed wing aircrafts, is capable of short take-off and landing and is capable of raising the flight efficiency. A power train and a rudder control system mechanism are simple, and are compactin structure and high in reliability.

A pultrusion die for material compounding comprises a glue injection box, a forming die and one or more core dies. The glue injection box comprises a channel for the core die to penetrate, the channelis provided with a feeding port and a discharging port, a guiding strip is arranged in the channel, the guiding strip extends to one side of the discharging port from one side of the feeding port, one end of the core die is supported or fixed through the guiding strip, the other end of the core die is arranged in a cavity of the forming die, and the distance between the core die and the inner wall of the cavity of the forming die is kept stable through the guiding strip. When fiber passes, liquid base materials in the glue injection box forwards move together along with the fiber, since the area of the cross section of the channel is gradually reduced, the inner pressure of the liquid base materials is increased, accordingly, the fiber can be rapidly soaked, and a composite material precursor is formed; and the composite material precursor passes through the two sides of the guiding strip and is gathered nearby an inlet of the cavity of the forming die to enter a gap between the coredie and the inner wall of the cavity of the forming die to be cured or sized into a composite material with a cavity, and accordingly, the precision of the composite material cavity wall thickness isimproved.

The invention relates to a flexible rotor of an ultra-high-speed liquid hydrogen turbo pump, comprising a screw (1), an inducer (2), a compression nut (3), a shaft (4), a first-stage centrifugal wheel (5), and a metal rubber damper device (6), squirrel cage elastic support (7), bearing pair (8), interstage shaft sleeve (9), secondary centrifugal wheel (10), balance piston (11), metal rubber damper baffle (12 ), the first shaft sleeve (13), the turbine disk (14), the large nut (15), the preloaded disc spring (16), the second shaft sleeve (17); the shafting of the flexible rotor of the present invention is bidirectionally extended, Optimize the connection and torsion transmission structure, reduce the mass of the rotor, shorten the cantilever and support span on both sides, work supercritically, the rated speed reaches 80000rpm, the critical speed margin is more than 20%, and has 60%‑100% variable working conditions and axial Force-adaptive balance ability.