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 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 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.

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.

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 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 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.