11results about How to "Large span" patented technology

The invention provides a supporting leg system and an engineering machine. The supporting leg system comprises a supporting leg box, the supporting leg mechanism comprises a first supporting leg arm, a second supporting leg arm, a rotary driving part and a telescopic driving part, the first supporting leg arm is hinged to the supporting leg box, and the second supporting leg arm is arranged in the first supporting leg arm in a penetrating mode; the rotation driving piece and the telescopic driving piece are both electrically connected with the controller, and the controller is configured to obtain a supporting leg control instruction; under the condition that the supporting leg control instruction is obtained, the rotation driving part is controlled to drive one arm of the supporting leg to rotate relative to the supporting leg box according to the supporting leg control instruction; acquiring an avoiding angle range, a driving angle range and a current angle of one arm of the landing leg; when it is determined that the current angle is within the avoiding angle range, the telescopic driving part is shut down; and under the condition that the current angle is determined to be within the driving angle range, the telescopic driving part is controlled to perform telescopic driving according to the current angle. The safety of the landing leg system can be improved while the large span is achieved.

This utility model discloses a concrete curing device for concrete preparation, belonging to the technical field of concrete curing devices. It includes a liquid storage tank, casters rotatably connected to the bottom of the tank, and a push handle welded to the end face of the tank. A support frame is welded to the end face of the tank, and a spray assembly is installed below the support frame. The tank is filled with liquid water. Construction workers push the tank, and a booster pump pressurizes the liquid water, which is then sprayed onto the concrete surface through a spray pipe and a spray hood at the bottom of an extension pipe, providing excellent curing results. The mounting base and the end of the extension pipe are fixedly connected. Depending on the span of the concrete structure, the extension plate is rotated relative to the support frame, and then the extension bolts are tightened. The insertion end of the extension bolt extends into the threaded groove, thereby adjusting and fixing the angle and position of the extension pipe, increasing its span, and improving curing efficiency during spraying.

The application discloses an openable explosion venting hatch cover structure for a hydrogen-containing cabin of a sea platform and a manufacturing and mounting method, and the explosion venting hatch cover structure is composed of a steel frame, an upper layer of profiled steel plates, a lower layer of profiled steel plates, a fireproof layer, a deck connecting structure and a ridge sealing structure. The hatch cover structure is higher than a deck plane as a whole, a hatch cover top surface adopts bidirectional pitching, a slope is not less than 5%, and a hatch cover structure steel frame bottom surface is horizontal. The hatch cover structure is formed as a whole through the steel frame, can be used as a roof lifting cover, has the advantages of overall lifting, overall dismounting and convenience for hoisting cabin equipment. The hatch cover structure is provided with the fireproof layer between the two layers of profiled steel plates, has the explosion pressure relief function and the fireproof function. The application solves the problems of rapid disintegration of the hydrogen-containing cabin hatch cover and pressure relief in the cabin, has the structural functions of being able to bear typhoon load, fireproofing, water sealing and the like, has the advantages of being openable, small damage to adjacent facilities, independent manufacturing, installation and maintenance and the like.

The utility model discloses a kind of sealing layer and windowing integrated deflector device, including windowing milling cone, deflector, support slip hydraulic assembly, hand-off sub, permanent packer sequentially connected from top to bottom;Support slip hydraulic assembly includes deflector anchoring slip and deflector support slip;The upper end of hand-off sub is connected with the lower end of deflector support slip by screw thread;The lower end of windowing milling cone is connected between the upper end of deflector by pin;The upper end of deflector is communicated with capillary tube;Deflector, support slip hydraulic assembly, hand-off sub and permanent packer are interconnected between each other.Utilize the utility model, sealing packer, deflector, windowing milling cone can be realized to be placed in place one time, can avoid conventional deflector process cumbersome, construction time is long, cost is high and prone to accident etc.

The application discloses a kind of pre-tension prestressed frame assembly structure system and its construction method, it includes concrete column, pre-tension prestressed thin bottom composite beam, pre-tension prestressed thin bottom composite board, post-tying steel framework and post-cast concrete, wherein, concrete column can be cast-in-place or prefabricated, column is made to floor place and reserves reinforcement and post-cast area;The pre-tension prestressed thin bottom composite beam is composed of prestressed steel strand, thinner concrete beam bottom plate, stirrup, beam reinforcing rib, wherein, prestressed steel strand is used as part of force longitudinal reinforcement, beam bottom plate is laid with non-prestressed reinforcement, non-prestressed reinforcement includes bottom and top longitudinal reinforcement, stirrup, wherein longitudinal reinforcement is anchored into concrete column, meets specification seismic requirement, enhances the overall performance and ductility of structure.The application is laid with steel reinforcement perpendicular to reinforcing rib on the bottom plate of pre-tension prestressed thin bottom composite board, reinforcing rib has hole, steel reinforcement can be passed through reinforcing rib, composite floor can be bidirectional force transmission, and the overall structure is comparable to cast-in-place.

This invention provides a support structure for erecting large-span truss steel beams, comprising steel pipe piles, transverse connecting components, and longitudinal connecting components. Four steel pipe piles are evenly arranged in a rectangular pattern. Two longitudinal steel pipe piles are connected by longitudinal connecting components, and two transverse steel pipe piles are connected by transverse connecting components. Each longitudinal connecting component includes an upper longitudinal truss and a lower longitudinal truss, connected by diagonal braces. Two diagonal braces are arranged at the left and right ends of the longitudinal connecting component, forming a figure-eight shape. Each transverse connecting component includes an upper transverse truss and a lower transverse truss, with the upper transverse truss corresponding to the upper longitudinal truss and the lower transverse truss corresponding to the lower longitudinal truss. This invention provides a support structure for erecting large-span truss steel beams, which has the advantages of simple structure, easy construction, light weight, good applicability, and high structural stability.

This utility model relates to the field of wind turbine pitch reducer technology, specifically to a pitch reducer structure, including an output shaft and a housing. One end of the output shaft is connected to a planetary carrier. The output shaft includes a first connecting section and a second connecting section arranged sequentially from the outside to the inside along the axial direction. The second connecting section has external threads, and the inner wall of the planetary carrier has internal threads. The first connecting section has multiple external pin holes, and the planetary carrier has multiple internal pin holes. Matching internal and external pin holes together form mounting pin holes, with locating pins inside. The planetary carrier and the output shaft are axially positioned by the matching of internal and external threads, and circumferentially positioned by the matching of mounting pin holes and locating pins. A large tapered bearing and a small tapered bearing are provided between the housing and the output shaft, with the small tapered bearing positioned close to the planetary carrier. The reducer components in this design have reliable positioning, low risk of component failure, high safety, and can significantly reduce the risk of off-center loading.

This invention relates to a high-speed signal acquisition method, specifically a digital acquisition method for large dynamic range transient pulses, solving the technical problem that existing technologies struggle to record transient pulses with large amplitude spans and significant range uncertainties. The digital acquisition method for large dynamic range transient pulses comprises the following steps: Step 1: Establishing a digital acquisition system for large dynamic range transient pulses; the digital acquisition system includes an analog signal processing unit and a waveform digitization unit; Step 2: Pre-calibrating the digital acquisition system for large dynamic range transient pulses using a standard signal; Step 3: Inputting a transient pulse P1 into the pre-calibrated digital acquisition system for large dynamic range transient pulses from Step 2, obtaining waveform data of the pulse train P2, and acquiring and extracting waveforms with different gains to achieve digital acquisition of large dynamic range transient pulses.

This invention discloses a ratchet wrench, relating to the field of wrenches, comprising a housing, a motor, a transmission structure, and an operating head located at the end of the housing. The motor drives the operating head through the transmission structure, which includes a first-stage planetary gear mechanism and a second-stage planetary gear mechanism. The first-stage planetary gear mechanism includes a first sun gear and a first external gear ring, which is configured to move axially. A fixing member is fixed inside the housing, and by driving the axial movement of the first external gear ring, the first external gear ring can be selectively fixed or disengaged from the fixing member. When the first external gear ring is fixed to the fixing member, the transmission structure obtains a first transmission ratio; when the first external gear ring is disengaged from the fixing member, the transmission structure obtains a second transmission ratio; wherein the first transmission ratio is greater than the second transmission ratio. This invention has the advantages of a large adjustable range of transmission ratios and a compact and reliable structure.

The utility model relates to a kind of storable table tennis tables including assembling keel, rectangular table board and detachable net, rectangular table board is detachably set in the upper end of assembling keel, when disassembling, first, rectangular table board is disassembled on assembling keel, rectangular table board includes several rotating plates, several rotating plates are connected head to tail along the length direction of assembling keel, rotationally connected between adjacent two rotating plates, each rotating plate is successively rotated and folded upwards or downwards, the lower end of assembling keel is rotationally provided with support frame in four corners, support frame is rotated and folded inwards as a whole and is attached to assembling keel, the whole table tennis table is divided into multiple independent units, the volume of each independent unit is smaller, user can successively arrange folded rectangular table board and assembling keel, fully utilize various fragmented space to flexibly arrange independent unit storage, reduce the weight of single handling, so that storage and movement are more relaxed and labor-saving, improve the convenience of storage table tennis table.