34results about How to "Adjustable span" patented technology

The invention discloses a long-slab-span steel beam cast-in-situ floor formwork system, which comprises a floor template, an adjustable truss and an adjustable placement support seat for supporting the adjustable truss, wherein a grille is laid on the adjustable truss; the floor template is laid on the grille; the adjustable placement support seat is arranged on a lower flange of a transverse H-shaped steel beam; and the adjustable truss is a telescopic combined truss and is connected with the upper end of the adjustable placement support seat. Compared with the conventional normal truss formwork system, the long-slab-span steel beam cast-in-situ floor formwork system provided according to the invention has the advantages of adjustable span, adjustable height and suitability for different beam heights; the adaptability of the truss is greatly improved; and the formwork cost is greatly lowered.

The invention provides a hydraulic double-type crane which comprises a gantry unit, a skidding unit and dismounting and mounting units, wherein the gantry unit comprises gantry top sections, at least one gantry standard section connected to the lower parts of the gantry top sections as well as gantry bases connected below the gantry standard section; the dismounting and mounting units are connected to the gantry bases and comprise gantry self-dismounting and mounting systems and jacking sleeve frames; and the skidding unit is connected above the gantry top sections and comprises a skidding beam, a skidding bearing beam and a skidding beam skidding mechanism which can drive the skidding beam to skid on the skidding bearing beam. According to the hydraulic double-type crane, no-load and loaded skidding of the skidding beam can be achieved, and the skidding beam span can be adjusted.

The invention relates to an assembled light steel structure roof. The assembled light steel structure roof includes roof beam components, cross beam components, lower baffle components and stringer frame components; the light steel structure roof includes a plurality of the roof beam components arranged in a straight line; two adjacent roof beam components are fixed in series through two stringerframe components; each of the roof beam components is correspondingly arranged with the cross beam component; and each of the roof beam components is arranged with two lower baffle components. The assembled light steel structure roof provided by the invention is assembled by multiple components, which can realize rapid assembly during construction, and can also realize rapid disassembly; the structural characteristics of each component before assembly can be maintained after disassembly; folding structure design can reduce the occupied space and facilitate transfer and transportation; and thesteel structure roof can be assembled again to achieve repeated recycling, which avoids the waste of resources.

The invention provides an arc-length-variable wire cutting saw for machining crisp and hard materials in the technical field of mechanical manufacturing and applied to extreme machining. The arc-length-variable wire cutting saw comprises a wire guide wheel drive mechanism, a wire cylinder and wire conveying mechanism, a wire tension adjusting and controlling mechanism, a driving and cutting mechanism, a stand column and beam and a workbench. The workbench is installed on a lower beam body of the stand column and beam. The wire cylinder and wire conveying mechanism is arranged on an upper beam body of the stand column and beam. The wire tension adjusting and controlling mechanism and the driving and cutting mechanism are arranged on a stand column of the stand column and beam. The wire guide wheel drive mechanism is fixed to the upper end of the stand column of the stand column and beam. A second lead screw is driven by a synchronous belt to rotate so as to drive a fist sliding base matched with the second lead screw to move up and down along a second guide rail. A first wire guide wheel and an adjusting wheel are fixed to the first sliding base through bearings. By means of the arc-length-variable wire cutting saw, the sawing wire can be much fine, and the saw seam width is lowered; the using rate is increased, and the span of cutting wheels of the wire saw is adjustable; and the wire cutting saw is small in saw shearing force, few in cuttings, low in noise, smooth and orderly in cut face, simple in structure and low in cost.

The invention discloses a construction method of a reinforced concrete multi-span arch bridge or a continuous box structure bridge. The method is implemented according to the following steps: step 1) constructing the lower part structure of the arch bridge, wherein the lower part structure comprises a foundation, a middle pier and a bridge abutment; step 2) fixing flexible cables to piers of the arch bridge, fixing ground anchors through the flexible cables, and fixing the ground anchors to a ground to balance the horizontal force borne by the pier; step 3) erecting arch supports on each span of the bridge; step 4) constructing the upper part structure of the arch bridge on the arch supports; and step 5) removing the flexible cables and the arch supports. The construction method is simple in technology, reliable in quality, low in construction cost and rapider in construction speed, and the safety risk is lowered.

The invention discloses a portable luggable computer heat dissipation device which comprises a left base and a right base. A group of damping springs is arranged on the left base and the right base respectively, the upper ends of the damping springs are matched with lifting sleeves, one end of each lifting sleeve is in screwed connection with a lifting bolt, the end of each lifting bolt is rotatably matched with a lifting push block arranged inside the corresponding lifting sleeve, the lifting push blocks are matched with lifting frames arranged inside the lifting sleeves, a group of cooling fans and carriages is arranged on the left base and the right base respectively, the carriage on the left base is connected with the carriage on the right base through a carriage telescoping rod, refrigeration frames penetrate into the carriages, and a group of semiconductor refrigerating sheets are arranged on the refrigeration frames. The portable luggable computer heat dissipation device is stable to place, has the characteristic of stretchable extension, is wide in applicability, can provide good bottom ventilation conditions for a luggable computer, further has a local refrigeration role and has pertinence in heat dissipation.

The invention provides a large-span steel arch frame. The large-span steel arch frame is mainly composed of arch foot segments, standard segments, adjusting segments, closing segments and closing devices in an assembled mode, except the closing devices, lower chords of the adjacent segments are in hinged connection through penetrating pins, and upper chords of the adjacent segments are in opposite-pulling connection through bolts on the multiple side faces of chord members, so that the arch frame is formed; and wedge blocks are arranged between the transverse end faces of the upper chords of the adjacent segments, and the wedge blocks are axially and radially limited between the transverse end faces of the adjacent segments. The large-span steel arch frame is adjustable in rise span ratio,adjustable in span and especially suitable for construction of a main arch ring of a cast-in-place reinforced concrete arch bridge with the span being greater than 150 meters; and the rise span ratioand the span of the large-span steel arch frame are adjusted ingeniously, the force transfer effect is good, stability is good, and the force transfer effect is quite excellent.

A ladder stand-off includes an extension beam and first and second stand-off sections slidingly mounted on the extension beam, so as to provide an adjustable span. Each stand-off section includes a support beam and an arm fixedly connected to the first support beam. A contact element is pivotally contacted to the outer end of each arm, allowing the device to be used with flat, curved and corner surfaces. The two arms preferably extend in an outward direction so as to be angularly divergent with respect to each other. The device can also be implemented as a ladder stand-off kit having multiple extension beams of different lengths that can be used interchangeably with the two ladder stand-off sections. In this case, the desired extension beam would be assembled with the first and second stand-off sections to form a ladder stand-off.

The invention belongs to the field of wind power generation equipment, and discloses a box opening tool for a gear box. The box opening tool for the gear box comprises at least two stand column assemblies, rotating pieces and a supporting beam; each stand column assembly comprises a first rod and a second rod, the bottom end of each first rod is fixedly arranged, and each second rod is arranged on the corresponding first rod in a sliding mode; the rotating pieces are rotatably arranged at the top ends of the second rods, the length of the supporting beam is adjustable, and the ends of the supporting beam are connected to the corresponding rotating pieces, so that the supporting beams are connected with the at least two stand column assemblies to jointly define a portal frame structure; the portal frame structure defined by the stand column assemblies, the rotating pieces and the supporting beam is high in bearing capacity, simple in structure and easy to disassemble and assemble; and the first rods are in sliding fit with the second rods, the supporting beam is rotationally connected with the stand column assemblies through the rotating pieces, the length of the supporting beam is adjustable, therefore, the height, span and installation position of the box opening tool of the gear box can be adjusted according to different installation working conditions, and universality is improved.

A pipe wire saw ultrasonic cutting equipment, including a base, a turntable drive motor and a sprocket, a slide table guide rail pair, a slide table drive motor, a slide table screw thread pair, a wire saw drive wheel, a wire saw, a cutting guide wheel, a right Semicircular sprocket disc, left semicircular sprocket disc, torsional vibration transducer, wire saw drive motor, etc. The right semicircular sprocket disc and left semicircular sprocket disc are installed on the sprocket disc plate by positioning pins and connecting bolts , and is fixed by the positioning connecting rod to form a complete turntable. Six mobile positioning indenter bases are respectively fixed on the right semicircular sprocket disc and left semicircular sprocket disc according to a 120-degree distribution, and are installed on the mobile positioning indenter seat on the mobile positioning The moving positioning indenter is guided and moved on the indenter seat and fixed by adjusting bolts, and the moving positioning indenter is in contact with the outer circular surface of the workpiece. The saw wire of the invention can be made very thin, the width of the saw seam is reduced, the yield of the material is increased, the span of the cutting wheel of the wire saw is adjustable, the power consumption is low, the noise is low, and the noise is low, and the invention is applied in the technical field of pipe machining.

The invention discloses a span adjusting method for a multi-head 3D printer. The method comprises the steps: S1, when a molten raw material is accepted by a first communicating hole, making the molten raw material flow into a first extrusion head by the first communicating hole and a first melting runner, and carrying out extrusion molding by using the first extrusion head; S2, when the molten raw material is accepted by a second communicating hole, realizing the span adjustment between the first extrusion head and a second extrusion head in the process that a storage supporting body moves along a guide direction of a guide rail, making the molten raw material flow into the second extrusion head by the second communicating hole, a pushing trough and a second melting runner, and carrying out extrusion molding by using the second extrusion head; and S3, when the molten raw material is simultaneously accepted by the first communicating hole and the second communicating hole, making the molten raw material flow into the first extrusion head by the first communicating hole and the first melting runner, or making the molten raw material flow into the second extrusion head by the second communicating hole, the pushing trough and the second melting runner so as to realize the simultaneous work of the first extrusion head and the second extrusion head.

The invention provides a large-truss-height adjustable suspended splicing combined type frame steel arch frame and an integrated large-span arch ring integral pouring process, the steel arch frame comprises an arch foot section, a standard section, an adjusting section, a closing section and a closing device which are sequentially connected in the arch arc line direction, and a plurality of sections arranged side by side in the arch width direction form an arch rib; the adjacent arch ribs are transversely connected through horizontal connecting pieces and vertical connecting pieces, the upper layer truss, the lower layer truss and the vertical frame are jointly spliced to form the overall stress type arch frame, and the connecting portion of the upper layer truss and the lower layer truss is located at the arc line of the middle of the arch. The process comprises the following steps: loading steel arch frame sections in a stacking manner, transporting the steel arch frame sections to a construction site, constructing arch foot sections, constructing standard sections, adjusting the sections, folding the sections, folding the steel arch frames, supporting an arch mold, and carrying out integral cast-in-place construction. The large-span steel arch has the advantages of being good in overall stability, uniform in stress, high in strength, adjustable in span, adjustable in arc, adjustable in breadth and the like, and the problems of transportation and construction of the large-span steel arch are solved.

The invention belongs to the field of agricultural and animal husbandry machinery, and particularly relates to an adjustable frame of a potato harvester. The adjustable frame of the potato harvester has functions that the span is adjustable, the frame is liftable, and operation requirements for different road conditions, work requirements and ground slopes are met. The adjustable frame of the potato harvester comprises a mounting frame, an adjusting rack, a right walking wheel axle, a seat equipped hoist cylinder, a front-rear adjusting rack welding piece, a front-rear adjuster and a span adjusting rack, wherein the adjusting rack is located on the right side of the adjustable frame ad are matched in two positions with the mounting frame for mounting and fixing; the seat equipped hoist cylinder is located on the right side of the adjusting rack, is hinged and fixed with the adjusting rack through a thick hinge pin and in rigid connection and fixation with the right walking wheel axle through a bolt B and a nut B, and a vertical shaft is welded on the seat equipped hoist cylinder and hinged and fixed with the front-rear adjusting rack welding piece; and the front-rear adjusting rack welding piece is located at the front lower part of the seat equipped hoist cylinder, and is connected and fixed in two positions with the mounting frame through the span adjusting rack and the front-rear adjuster.

The embodiment of the invention provides a supporting leg structure and an automobile crane, relates to the field of crane supporting legs, and aims to solve the problems that an existing supporting leg is small in span adjustable range and high in operation site requirement. The supporting leg structure comprises a chassis, a movable supporting leg and a hinged seat, the hinged seat is connectedto the chassis in a swinging manner, the movable supporting leg is connected to the hinged seat in a swinging manner; in the process that the hinged seat swings relative to the chassis, the movable supporting leg swings on the horizontal plane; and in the process that the movable supporting leg swings relative to the hinged seat, the movable supporting leg swings on the vertical plane. The automobile crane comprises the supporting leg structure. The movable supporting leg can swing on the horizontal plane and the vertical plane, so that the span of the movable supporting leg in the length direction and the width direction of the chassis is adjustable, the movable supporting leg can be suitable for various terrain operations, and the operation site requirement is low.

The invention discloses a large-span light subway evacuation platform plate and a manufacturing process thereof, and belongs to the technical field of assembly. In order to solve the problems that the construction speed is affected due to the fact that an existing subway evacuation platform plate is large in weight, difficult to assemble and small in span, and fire resistance, cracking resistance, corrosion resistance and the like cannot be considered at the same time, a novel light-weight high-strength concrete material is developed, and the platform plate takes the novel material as a base body, takes a hollow ribbed structure as a plate type and takes basalt fiber woven ribs as prestressed ribs; rib feet are arranged, a steel pipe system is embedded, and prestress is applied to the lower portion of the plate, so that the hollow plate, the steel pipe system and prestressed tendons form a balance system, and the bottom face of the main plate is pressed but not pulled. The limitation that prestress cannot be applied in an existing platform plate due to plate thickness limitation is broken through. The advantages of materials, prestress and a combined structure are fully exerted, and the manufactured platform plate has the characteristics of light weight, large span, fire resistance, cracking resistance, erosion resistance and the like, and has remarkable economic benefits and wide engineering applicability.

The invention discloses a span-adjustable beam lifter which comprises a cross beam. An adjusting structure is arranged on one side face of the cross beam, a fixing block is fixedly connected to the lower surface of the adjusting structure, a supporting frame is fixedly connected to the lower surface of the fixing block, and a box body is fixedly connected to the lower surface of the supporting frame. A transmission structure is arranged in the box body, and the adjusting structure comprises a sliding clamping ring, a rack, a limiting box, a gear, a screw rod and a first-stage servo motor. According to the span-adjustable beam lifter, through cooperation of rolling wheels and the transmission structure, the span-adjustable beam lifter has the effects of being capable of moving transverselyand vertically, so that the effect that movement is convenient is achieved; and through cooperative arrangement of the adjusting structure and the cross beam, in the using process, the supporting frame can be indirectly driven to move through the first-stage servo motor, then the effect of improving the applicability is achieved, and the purpose of adjusting the span is achieved.