445results about How to "Guaranteed support strength" patented technology

The invention provides a ventilation steel channel, a manufacturing method of the ventilation steel channel, a ventilation structure and a motor. The ventilation steel channel provided by the invention comprises at least four ventilation steel channel sections which are sequentially connected, wherein an included angle between every two adjacent ventilation steel channel sections is smaller than 180 degrees; in every three ventilation steel channel sections which are sequentially connected, the ventilation steel channel sections at both sides are distributed at both the sides of the ventilation steel channel in the middle. According to the ventilation steel channel provided by the invention, the multi-turn structure can effectively break through a boundary layer between the ventilation steel channel and cooling gas flowing through ventilation grooves; the heat dissipation area is increased; cooling and heat dissipating effects are reinforced; meanwhile, under the condition of reducing used materials, supporting intensity of the ventilation steel channel can be ensured.

The invention relates to a gardening tool, in particular to a tree support device for protecting trees. The tree support device comprises an enclosing hoop which revolves around a tree trunk and a support rod connected with the enclosing hoop, wherein a flexible woven belt of the enclosing hoop is provided with a lap joint piece; the lap joint piece has a rigid structure, and the support rod is fixed to the periphery of the enclosing hoop by a fastening screw; the flexible woven belt is arranged around the periphery of the tree trunk, and is connected by a belt fastener; a belt tightening device is arranged on the belt fastener additionally; a scroll of the belt tightening device entering in the belt fastener is buckled with the belt fastener through a slot arranged on the belt fastener; one end of the scroll enters a housing of the belt tightening device; a group of turbine and worm are arranged in the housing of the belt tightening device; the turbine is arranged on the scroll of the housing; the worm and the turbine are meshed; one end of the worm crosses the housing, and the out end, of a hexagonal shape, is matched with a rotary handle. The tree support device has a simple structure and good support effect, the flexible woven belt which revolves around a tree walk can be tightened or released easily by the belt tightening device, and the support device can be installed quickly, simply and conveniently on site, so time and labor are saved.

The invention discloses a method for automatically constructing support of a confined concrete arch center for an underground tunnel. The confined concrete arch center at least comprises two sections, adjacent sections are hinged at joints, the contact surfaces of joints of two adjacent sections are structures matched with each other, the structure of the contact surface of one section is a convex structure, while the structure of the contact surface of the other section is a concave structure matched with the convex structure, a structure is arranged between the convex structure and the concave structure and is used for engaging and fixing the two structures when the two structures are in a matched state, and each section is of a composite structure of which square steel or round steel is filled with concrete. The arch center adopting a foldable mode can be automatically unfolded in the constructing process, does not need manual field splicing, and is safe and efficient; and the concave structure and the convex structure which are matched with each other are arranged on contact surfaces of the joints, and the engaging structures are arranged, so that the confined concrete arch center is automatically engaged when being extended, construction is facilitated, and the support strength of the confined concrete arch center is guaranteed.

The invention discloses a building pillar removing device and method. The building pillar removing device and method aim to overcome the defects that after existing house building pillars are removed, the influence on the structural strength of a house is large, the supporting strength at the pillar removing position of the house is lowered, and then the service life of the house is shortened. Before the pillars are removed, surrounding pillars and a cross beam or a floor need to be subjected to prestress concrete reinforcement, prestress steel strands are installed in prestress concrete, and each prestress steel strand penetrates through self-locking sleeves on self-locking plates and then the self-locking sleeves are backwards compressed; then jacking hydraulic cylinders are installed on the self-locking plates, and each prestress steel strand penetrates through locking sleeves on jacking plates and the locking sleeves are backwards compressed, so that the prestress steel strand is tightly clamped in the locking sleeves; and the jacking hydraulic cylinders at the two ends of the steel strands are started synchronously and push jacking pistons to outwards tension the prestress steel strands, and when it is detected that pressure borne by the pillars to be removed is within the safety removing range, the pillars to be removed are cut off and removed.

The invention discloses a corrugated bracket of a fan. The corrugated bracket of the fan comprises an air guide ring, a plurality of flow guide blades and a bracket hub, wherein a motor is mounted atone side of the bracket hub; fan blades are connected to the motor through a rotating shaft and are mounted at the other side of the bracket hub. The corrugated bracket of the fan further comprises anopening expansion structure which is arranged at the end part of the air guide ring; the flow guide blades are arranged between the opening expansion structure and the bracket hub; the line of the inner wall of the opening expansion structure is inclined; corrugated noise reducing structures, comprising at least one group of wave crests and wave troughs, are arranged at the rear edges of the flowguide blades; each group of wave crests and wave troughs is arranged in the direction from the rear edges of the flow guide blades to the front edges of the flow guide blades. With the adoption of the corrugated bracket of the fan, the motor can be supported during being mounted, and moreover, the flow guide blades are corrugated, so that air output by the fan can be rectified, and as a result, the fan eddy loss is decreased, the fan efficiency is improved, and the broadband eddy noise is reduced.

The invention provides a light guiding module and a projection device provided with the light guiding module. The light guiding module comprises a light pipe module and a hook, wherein the light pipe module comprises a light pipe and a protection shell, the light pipe is used for guiding light inside the projection device, the protection shell is sleeved outside the light pipe, the hook is arranged on the protection shell and is provided with a first end and a second end, the first end is fixed on the protection shell, and the first end is wider than the second end. When the light pipe module is placed on a platform provided with a first groove, the second end of the hook is placed in the first groove in a movable mode. Due to the fact that the hook is designed to be with a gradually changing width, purposes of small friction force and low light pipe module adjusting difficulty are achieved.

The invention discloses a sofa seat frame, comprising a frame and several elastic members disposed in the frame. The frame comprises two symmetrically-disposed longitudinal beams and two crossbeams for connecting the two longitudinal beams. The cross section of the longitudinal beams is L-shaped and includes a vertical plate and a horizontal plate. The vertical plate and the horizontal plate forma placement cavity, and both ends of the horizontal plate in the length direction are bent towards the inner side of the placement cavity to form a folded edge. The two crossbeams are symmetrically disposed on folded edges at both ends of the longitudinal beams and located in the placement cavity. The sofa seat frame also comprises at least a supported beam, which is connected with the two crossbeams. In comparison with existing sofa seat frame structures, the invention has the following advantages: under the precondition of guaranteeing support strength of the seat frame, the production efficiency of components is improved, manufacturing materials are reduced, production cost is decreased, and complicated assembly process and required parts are simplified; and automation is easy to realize.

The invention belongs to a flexible supporting device and flexible supporting pieces of a photoetching machine. Each flexible supporting piece comprises a top block, a flexible connecting mechanism and bottom blocks, wherein the top block is connected with an objective lens; the bottom blocks are connected with a main base plate; the flexible connecting mechanism comprises two flexible connecting pieces; the flexible connecting pieces are arranged between the top block and the bottom blocks to form a herringbone or inverted-T-shaped flexible supporting piece; each flexible connecting piece is a frame structure with an internal beam or a beam structure with a flexible hinge. The flexible supporting device comprises a first flexible supporting piece, a second flexible supporting piece and a third flexible supporting piece, wherein the three flexible supporting pieces are distributed at three intersection points of an isosceles triangle; the objective lens is arranged in the center of the triangle. According to the technical scheme provided by the invention, the overall modal of an assembly of the objective lens and the main base plate is smaller than 30Hz by virtue of the adopted flexible supporting pieces and the positional layout of the flexible supporting pieces. Each flexible supporting piece is ultralow in rigidity and sufficient in supporting strength, and meanwhile, the stress concentration is avoided.

The invention discloses a construction method for advance grouting and supporting for tunnel partial collapse, and relates to the technical field of tunnel construction. Based on back pressure backfilling, sleeper stacks are used for further supporting the part which have the quickest and largest deformation and is the most unstable in the initial supporting, so that the fact that the entire steelarch wholly collapses from the arch part and causes the currently stable steel frame on the left side of the line to damage together is avoided, and the collapse range and intensity are controlled; the grouting reinforcement is carried out to the deformed section surrounding rock, so that the aims that the deformation is controlled and the safe replacement of the deformed limit invasion steel frame is guaranteed are achieved, and better supporting effect is realized; a butterfly arch is used to better conform to the practical situation of the site surrounding rock, so that the supporting forthe unstable surrounding rock at the single side deformation section is strengthened, and the fact that the supporting intensity meets the site requirements is guaranteed; the advance supporting measures are adopted to improve the front surrounding rock integrity and self stabilization capability, and the construction safety is guaranteed; different from the traditional manner of total-ring arch replacement, the cost is low, the adaptability is high and the generalizability is high.

The invention discloses a fixation system for a hand trauma operation. The fixation system comprises a fixing plate and a water holding plate mounted below the fixing plate, wherein clip positioning holes are equidistantly formed in the periphery of the fixing plate; an arm fixing bandage is detachably connected to an arm fixing part; a pull hook assembly is detachably connected to the fixing plate and comprises a clip, a pull hook supporting plate fixedly connected to the clip, and a pull hook detachably mounted on the pull hook supporting plate; a finger fixing assembly is detachably connected to the fixing plate and comprises a clip, a locking part fixedly connected to one clip plate of the clip, and a finger fixing part connected to the locking part; and a finger supporting assembly is detachably connected to a through hole of the fixing plate and comprises a finger supporting plate and a palm supporting assembly. A platform is convenient to use and the labor intensity of medical personnel is reduced.

The invention discloses a surrounding rock reinforcement method for a junction tunnel section in an upper-soft lower-hard stratum constructed adopting a shield method and a mining method. The method comprises the steps that 1, tunnel face grouting reinforcement is carried out, specifically, grouting reinforcement is carried out on stratum in front of an excavation face of an upper tunnel body by adopting grouting pipes; 2, junction surface grouting reinforcement is carried out, specifically, grouting reinforcement is carried out on the reinforced stratum by adopting sleeve valve pipes; 3, tunnel arch part advanced support is carried out, specifically, advanced support is carried out on an arch part of the junction tunnel section; 4, grouting pipe removal is carried out; and 5, tunnel faceplugging is carried out, specifically, a tunnel face is plugged through concrete backfilling, and a tunnel face plugging structure is obtained. The method is reasonable in design, simple and convenient to construct and good in use effect, and surrounding rock of the junction tunnel section is effectively reinforced by the method of combining the surface grouting reinforcement with the in-tunnel reinforcement so that the mechanical property of the surrounding rock can be effectively improved; and the tunnel face of the junction tunnel section is reliably plugged before and after reinforcement so that tunnel safety construction can be effectively guaranteed, and ground settlement caused by excavation can be effectively reduced.

The invention discloses an auxiliary support structure and an application method thereof for laser selective forming of a suspended plane and belongs to the technical field of additive manufacturing.The auxiliary support structure comprises at least one back-up block. A first supporting plane, a second supporting plane and a suspending plane are arranged on the back-up block. The first supportingplane is used for connecting a suspending plane of a product and supporting the suspending plane. The second supporting plane is used for connecting an inner surface of the product. The plane of thesuspending plane is crossing with the first supporting plane and the second supporting plane. Due to the suspending plane, the volume of the support structure can reduce more than 40%, the forming time of the auxiliary support structure is reduced, the volume of the row material is reduced. The cost of production is saved. Meanwhile, the probability of a partial disintegrate and collapse of the auxiliary support structure for laser selective forming of suspended surface in forming process are significantly reduced. The probability of wrapping and deforming is also significantly reduced. The qualified rate is improved.

The invention relates to a connecting piece and a platform thereof. The connecting piece comprises a connecting frame and a mounting plate; the connecting frame is provided with a connecting rods, and the mounting plate is provided with through holes; the connecting frame consists of two U-shaped frames and a middle beam; two ends of the middle beam are fixedly connected with cross beams of the two U-shaped frames respectively; the connecting rods downwards extend and gradually thicken to form a cylinder, and the lower end of the cylinder is provided with screw threads; and the platform comprises a platform support, a platform component and a connecting piece, wherein the platform support and the platform component are mutually crossed and jointed together; the connecting frame on the connecting piece is buckled at the cross jointed part; the mounting plate is arranged on the bottom surface of the platform support, so that four connecting rods of the connecting frame pass through through holes of the mounting plate; and the platform support and the platform component buckled in the mounting plate are compressed and fastened through gaskets and nuts. The connecting mode of the platform component and the platform support is improved so as to be more practical.

The invention discloses a full-automatic moving type field sampler supporting platform. The full-automatic moving type field sampler supporting platform comprises a positioning measuring platform and a moving base, wherein the positioning measuring platform is detachably mounted at the upper part of the moving base. By carrying out field combination and adjustment, the full-automatic moving type field sampler supporting platform disclosed by the invention can expand a range of measured height to be 0.07m-2m, and the measured height can be automatically adjusted by controlling a motor through a remote controller; a laser distance measuring instrument can be used for automatically and accurately measuring the measured height; and meanwhile, the full-automatic moving type field sampler supporting platform has high supporting intensity and light weight, is convenient to move and carry, is convenient to operate and is easy to popularize and apply.

The invention discloses a convenient-to-move 3D holographic projection equipment for cultural transmission, exhibition and display. The 3D holographic projection equipment comprises a moving frame, astorage box is fixedly connected to the top of the moving frame, a display rack is arranged at the top of the storage box, guide assemblies are arranged at the four corners of the bottom of the display rack, an adjusting screw rod is arranged in the center of the bottom of the display rack, a conversion assembly is arranged in the display rack, electric push rods are fixedly connected to the fourcorners of the top of the display rack, and a mounting base plate is fixedly connected among the output ends of the four electric push rods. Two pressing bolts are adjusted through the conversion assembly to enable an adjusting block to horizontally ascend and descend, and conversion between the cleaning adjusting state and the storage state is achieved. Through the cooperation of a mechanical structure and the electric push rods, storage and installation of the device are facilitated, and use is convenient. In the storage and installation process, an upper cleaning assembly and a lower cleaning assembly can conveniently clean a transparent film plate, and work is more efficient while the display imaging effect is guaranteed.

The invention discloses a road manhole cover with adjustable height, comprising a manhole cover, an upper manhole and a lower manhole which match with the manhole cover, at least two lifting devices and at least two auxiliary supports, which are connected with the upper manhole and the lower manhole. The lifting devices and the auxiliary supports are evenly distributed on the circumference of the upper underside of the lower manhole at intervals, and the screws at the lower parts of the lifting devices and the auxiliary supports are connected with the threads of the lower manhole; wherein the auxiliary supports contact with the lower underside of the upper manhole and the lifting devices are hinged at the lower part of the upper manhole. The road manhole cover is convenient to be adjusted in height, low in cost, stable in structure and adjustable in height.

The invention relates to a clamping device and a hanging tool structure applying the clamping device; wherein, the clamping device includes a clamping arm and at least two blocking clappers which are respectively arranged at the two ends of the clamping arm. The blocking clapper is provided with a fixedly connecting part arranged at the end part of the clamping arm and a clamping part extending out of the clamping arm. The clamping part is provided with at least one through hole. The claming device has the advantages of reducing the flow marks on the surface of a work-piece and improving the quality of the work-piece thereby.

The invention provides a loudspeaker box, comprising a lower cover; an upper cover, wherein a storage space is enclosed by the lower cover and the upper cover; a sound production unit stored in the storage space; a sound conduction channel formed in the storage space; an annular supporting wall which stretches along a direction from the upper cover to the lower cover and is used for supporting thesound production unit; and a reinforcement sheet. The side of the supporting wall resisting against the sound conduction channel is equipped with a through hole penetrating the supporting wall. The sound production unit is supported by the supporting wall. A front sound cavity is enclosed by the sound production unit and the supporting wall. The front sound cavity is communicated with the sound conduction channel through the through hole. The front sound cavity and the outside world are communicated through the sound conduction channel. The reinforcement sheet is an annular structure and is fixedly supported by the supporting wall at the side close to the lower cover. The sound production unit resists against the reinforcement sheet to form seal. Compared with the prior art, the loudspeaker box provided by the invention has good waterproofness and excellent acoustic performance.

The invention discloses a novel building powder angle-of-repose testing device and a using method. The novel building powder angle-of-repose testing device comprises a control mechanism, a measuring mechanism, a supporting mechanism and a material conveying mechanism. The supporting mechanism is used for supporting the control mechanism, the measuring mechanism and the material conveying mechanism which are arranged on the upper portion. The control mechanism is in communication connection with the supporting mechanism and the material conveying mechanism. According to the novel building powder angle-of-repose testing device, the angle of repose of powder can be automatically worked out according to height and diameter data, and the defects that in the prior art, manual operation repeatability is poor, and testing precision is not high are avoided. To further guarantee the testing process precision, a dust cover is arranged on the upper portion of a material storage barrel, and pollution caused by mixing impurities is avoided. The material storage barrel is made of high-intensity FRP, and the state of the powder inside the material storage barrel can be observed in real time while the supporting intensity is guaranteed. The whole device is compact in structure, less space is occupied, the device is convenient to move when not needed, and angles of repose of all kinds of powder can be tested conveniently.