316 results about "Frustum" patented technology

The invention discloses a high-precision point iridium welding device and process, and relates to the technical field of pen point welding. The device comprises a conveying assembly capable of moving along an annular path, a welding assembly arranged below the conveying path and positioning tools arranged corresponding to conveying blocks. The conveying assembly comprises a plurality of conveying blocks, and the positioning tool is used for inserting a to-be-welded pen point base material; the welding assembly comprises a hopper, a feeding pipe coaxially connected with the hopper in a sliding mode, an electrode ring fixed to the top end of the feeding pipe and an inverted-cone-frustum-shaped iridium particle groove formed in the top end. The hopper can be filled with iridium particles to be welded, the feeding pipe can ascend and descend in the vertical direction, and the iridium particle groove can bear one iridium particle. Through cooperation of the conveying block and the positioning tool, quick assembly and feeding of the pen point base material are facilitated, the feeding difficulty is reduced, and manual feeding is more labor-saving.

The invention discloses a support installation angle measuring device for photovoltaic power generation, which relates to the technical field of measurement and comprises an installation position structure, a magnetic field control assembly and a measuring assembly. The installation position structure is arranged at the connection position of a stand column and a cross beam of the photovoltaic support, the connection point of an inclined supporting rod and a main frame and the connection area of a base and a foundation, under the cooperation of the magnetorheological fluid cavity assembly and the magnetic field control assembly and the design of a spiral flow guide groove and a cone frustum cavity, the fluid distribution uniformity is improved, and under the action of a magnetic field, the fluid distribution uniformity is improved. The spiral flow guide grooves guide the magnetorheological fluid to form spiral flow and cooperate with a rotating magnetic field, the support fixing effect is remarkably enhanced, and when the support deviates due to external force, the micro stress sensor of the magnetorheological fluid cavity reversely deduces the angle through shear stress changes and feeds the angle back to the magnetic field control assembly for real-time correction. Therefore, stress is released and deformation is corrected under extreme working conditions such as strong wind and earthquakes, and the accuracy and response speed of angle control and measurement of the support are greatly improved.

The utility model discloses fabric shaping and stretching equipment which is provided with a fixing frame and a lifting frame, a plurality of moving plates are connected to the fixing frame and the lifting frame in a sliding mode, an unfolding mechanism for driving the moving plates to be unfolded at equal intervals is arranged, and fabric is fixed through the moving plates on the upper side and the lower side. Then the multiple moving plates are driven by the unfolding mechanism to be unfolded at equal intervals, then multiple pulling forces towards the two sides are applied to the fabric, the overall stress of the fabric is more uniform, the frustum-shaped pressing pipes are arranged on the moving plates to reduce the contact face with the fabric, and the situation that the stretching effect is affected due to the fact that the area of the pressed part is too large is prevented; and a rubber mat is fixed on the pressing pipe to prevent the fabric from being scratched.

The invention provides a pile pressing device and an operation method thereof. The pile pressing device comprises driving equipment, a clamp and a pile pressing assembly. The pile pressing assembly is connected with the tail end of the arm frame through a clamp. The clamp adaptive end is in clamping connection with the clamp; a profile steel framework is arranged in the fixture adaptive end; the tip end of the pressing pile is in an inverted cone frustum shape. Pile pressing force is directly applied from the interior of a pile core, clamping damage of a traditional clamp to the outer side of a pile body is thoroughly avoided, and the technical effects that the problem that the surface of the exposed pile body is damaged is solved, the integrity and attractiveness of the exposed face of the wall protection pile are guaranteed, and the cost caused by later appearance repairing is eliminated are achieved.

This invention discloses a frustum-shaped chill for the firing surface of cylinder heads in sand casting, belonging to the technical field of casting process auxiliary parts. The chill includes a chill body with multiple circular bosses evenly distributed along the radial direction on its top surface for precise positioning within the sand mold. The top surface of the body has crisscrossing venting grooves to expel gases generated during the solidification of the sand core and molten metal. The body is divided into upper and lower frustum sections, with the upper frustum being higher than the lower frustum, forming a gradient cooling structure. Through structural optimization, this invention achieves precise and controllable cooling of the cylinder head firing surface, reducing defects such as shrinkage porosity, looseness, and gas porosity to near zero, improving casting density and yield, and is suitable for sand casting production of various aluminum engine cylinder heads.

The utility model discloses a seedling puncher, and belongs to the technical field of punchers. Comprising a supporting frame, a conical head is fixed to the lower end of the supporting frame, the lower end of the conical head is a tip end part, the lower end of the supporting frame is elastically connected with an annular plate, the annular plate and the conical head are coaxially arranged, and the annular plate is in threaded connection with a plurality of long screw rods; the conical head comprises an inverted frustum, a vertical pipe coaxially fixed to the frustum and a conical head coaxially fixed to the vertical pipe, and the technical effect that the hole diameter of punched holes is adjusted so as to be suitable for different seedling raising and sowing is achieved.

The utility model relates to the technical field of metal smelting, in particular to a metal sampling mold. A first module is arranged on the base, a first groove body and a second groove body are formed in the first module, the longitudinal section of the second groove body and the longitudinal section of the first groove body are in an inverted-T shape, a second module is placed in the first groove body, the upper end of the second module extends out of the first groove body, and an inverted-circular-truncated-cone-shaped through groove is formed in the middle of the second module in an up-down penetrating mode and communicated with the second groove body. The second module is of a split type structure with the two sides opposite, first limiting rods are symmetrically fixed to the outer side of the second module, second limiting rods matched with the corresponding first limiting rods are arranged above the base, telescopic mechanisms are arranged between the two ends of each second limiting rod and the base, and the telescopic mechanisms are used for achieving vertical movement of the second limiting rods. The telescopic mechanism is arranged on the base in a sliding mode, and the second limiting rods which are symmetrically arranged get close to each other or get away from each other. And the alloy ingot can be completely taken out without knocking the mold, so that the efficiency is higher.

The utility model discloses a waterproof high performance european cable joint, and its stress cone subassembly includes upper body and lower body, and the upper body bottom array has a plurality of arc clamping pieces, and each arc clamping piece constitutes a frustum, and the lower body top has the taper hole corresponding frustum, and the shell bottom still has a bottom cover with a hole and is screwed, and the lower body is inserted in the upper body bottom, and the frustum of each arc clamping piece constitutes and is inserted in the taper hole, and the bottom cover presses the lower body and goes up and makes each arc clamping piece clamp the cable, and the junction of upper body and lower body still is equipped with first seal, and the bottom cover still is equipped with second seal, and the second seal lower extreme still has a ring of sealing ring, and the sealing ring is hooped between the cable and the hole inner wall of bottom cover, and the utility model discloses convenient assembly, and the cable is not easy and is produced with the joint loose, and the waterproof property is good.

The utility model discloses a multi-size sealing ring installation tool. The multi-size sealing ring installation tool comprises a main device body, a claw part assembly and an adjusting assembly. First and second air inlets are formed in the outer side wall of the main body; the claw part assembly comprises expanding claws and lifting claws which are distributed along the circumference at intervals, the expanding claws move in the radial direction, the ends of the expanding claws are provided with protrusions with supporting parts and supporting parts, the expanding claws are folded at the beginning to enable the protrusions to be gathered into a cylinder to be sleeved with the sealing ring, the expanding claws expand to open the sealing ring after air inflow, and the lifting claws eject the sealing ring out of the sealing ring to be clamped into a workpiece mounting groove; the adjusting assembly comprises an adjusting screw rod and a circular truncated cone, two ends of the screw rod are connected with a first knob and the circular truncated cone, a cylindrical ring body with an adjusting screw rod is arranged on the circular truncated cone to position a workpiece, and the air inlet is provided with an air inlet valve with an air adjusting valve. The tool solves the problems that a traditional tool is low in adjustment efficiency, installation deviation exists and a sealing ring is prone to being damaged through cooperation of the air-driven claw part, the adjustable expanding claw structure and the precise positioning assembly, and the multi-size adaptability, the installation efficiency and the sealing quality are improved.

An outer barrel comprises an outer cylindrical barrel body and an outer inverted frustum barrel body which are connected up and down, a circle of reinforcing ribs are coaxially arranged in the outer barrel around the circumference to be connected with an inner barrel with a flow guide cavity formed in a spaced mode, and the inner barrel comprises an inner cylindrical barrel body and an inner inverted frustum barrel body which are connected up and down. A motor is installed on the lower bottom of the inner inverted frustum barrel in a supporting and locking mode, an output shaft of the motor is directly connected with an impeller located in the outer inverted frustum barrel, an inner opening and an outer opening are correspondingly formed in the same sides of the inner barrel and the outer barrel, the inner opening extends to the lower bottom of the inner inverted frustum barrel from the upper end of the inner cylindrical barrel, and the outer opening corresponds to the inner opening. And a flow guide cavity between the inner opening and the outer opening is sealed by sealing plates on the two sides of the outer opening. The device is simple in structure, effectively considers cost and maintenance, and can be applied to different flow pressures.

The utility model discloses a quick-release threaded pipe, belongs to the technical field of pipeline structures, and provides a threaded pipe which can be directly and quickly disassembled and assembled without using tools, and comprises a splicing pipe and a push-pull handle, the main body part of the splicing pipe is a main pipe body, the middle part of the main pipe body is provided with an outer convex conical ring, and the end part of the main pipe body is provided with a connecting end; external threads are arranged on the outer side face of the connecting end, the two push-pull handles are fixedly connected through the connecting piece, the outer convex conical ring is located between the two push-pull handles and provided with a pair of symmetrical circular truncated cones, the axes of the two circular truncated cones are collinear with the axis of the main pipe body, each push-pull handle comprises a force application disc, and the inner wall of each force application disc is provided with an inner concave conical surface. The push-pull handle structure for rotation constraint is designed in the middle of the splicing pipe with the threaded structures at the two ends, and when the threaded pipe is disassembled and assembled, component force in the tangential direction of the spiral line is provided, so that operation can be achieved without using a wrench tool, the disassembly and assembly operation is simplified, and the disassembly and assembly efficiency is improved.

This utility model provides a measuring tool for detecting the runout of the outer circle of a UF outer star wheel relative to the inner arc track. It includes a base plate and a rotating structure, a clamping and fixing structure, and a measuring structure mounted on the base plate. The rotating structure includes a bearing seat and a rotating shaft. The bearing seat is fixed to the base plate and contains a bearing. The rotating shaft is located in the bearing and rotates relative to the bearing seat. The clamping and fixing structure includes an outer cylinder and a pull bolt. An inner cylinder is located at the top of the outer cylinder, and a reference ring is fitted around the top of the inner cylinder. Multiple rectangular grooves are spaced circumferentially on the top of the reference ring, and steel balls are movably placed in these grooves. The pull bolt includes a top clamping part and a bottom connecting part. The clamping part is in the shape of an inverted frustum, and its outer wall abuts against the steel ball. The connecting part connects to a drive assembly, which drives the pull bolt to move up and down. The measuring structure includes a dial indicator, which is fixed to the upper end of a vertical rod via a cantilever. The vertical rod is located on one side of the bearing seat.

The brake pad of the automobile brake system comprises a plurality of storage holes formed in the brake pad, the storage holes are vertically formed from the surface, close to a brake disc, of the brake pad to the interior of the brake pad, and each storage hole sequentially comprises a circular truncated cone storage part, a cylindrical storage part and a conical storage part which are communicated with one another; the upper bottom surface of the circular truncated cone storage part is arranged on the surface, close to the brake disc, of the brake pad, and the two ends of the cylindrical storage part are communicated with the lower bottom surface of the circular truncated cone storage part and the bottom surface of the conical storage part respectively. The storage hole structure formed by compounding the circular truncated cone storage part, the cylindrical storage part and the conical storage part is arranged on the surface of the brake pad, so that the trapping and coagulation efficiency of brake wear particles is effectively improved, and the emission level of micron-scale and nano-scale particles is remarkably reduced; the particle containing and heat management performance of a friction interface in different braking stages is improved, and meanwhile the abrasion resistance and braking stability of the surface of the brake pad are enhanced.

The present application provides a kind of inside flanging forming device of jacket through hole, belong to pressure vessel processing technical field.It solves the problem of existing technology when processing jacket through hole inside flanging, processing is troublesome, the problem of insufficient forming quality.The inside flanging forming device of jacket through hole, including cylinder body, forming die head and vertically arranged pull rod, forming die head is conical frustum and has the guide hole one along its axis through, the large end of forming die head is downward and fixedly connected in the upper end of cylinder body, the lower end of pull rod is slidably connected in cylinder body and pull rod can be relatively cylinder body axial telescopic under the action of hydraulic drive, pull rod is up and out of forming die head through the guide hole one, the upper end of pull rod can be detachably sleeved with the push seat that can be synchronous with pull rod and move down, the bottom of this push seat has the push part of circular tube shape and is concentrically arranged with forming die head.The present application makes jacket through hole can be smoothly and smoothly completed flanging forming, effectively guarantees the forming precision and forming quality of inside flanging.

This invention discloses a mixing and stirring device for phosphogypsum production, comprising a mixing cylinder, a fixed outer cylinder, a discharge drive motor, and a docking socket. The outer surface of the middle part of the mixing cylinder is rotatably connected to the fixed outer cylinder, which is coaxially arranged outside, via bearings. The tail end of the mixing cylinder is fixedly connected to a plug connector via bolts. The plug connector has a frustum-shaped body with a larger diameter end connected to the mixing cylinder. The head end of the mixing cylinder is recessed to form an inlet and outlet. Spiral blades are welded to the inner wall of the mixing cylinder. This invention enables continuous phosphogypsum mixing production. The separable structure of the mixing cylinder and the power source allows the motor to operate without stopping. The counterweight design stores energy to ensure that the rotating docking socket has high rotational inertia, enabling rapid rotational mixing after docking with the mixing cylinder.

A method of treating an end section of a conductor is described. The method comprises providing a radially directed compressive force onto the conductor, (10) where a cone sleeve (1) with a conical frustum shaped inner surface is applied to surround the conductor (10), a collet (11) with a conical frustum shaped outer surface is applied to surround the conductor (10) between the cone sleeve (1) and the conductor (10) end and an axially directed force to pull and / or push the cone sleeve (1) at least partially onto the collet (11) is provided to provide the radially directed compressive force onto the conductor (10). Also, a method for joining two end sections of conductors (10) is described.

This invention belongs to the field of forging machine technology, and particularly relates to a clamping device for a forging table in a forging machine. It includes a frustum-shaped base, on which a forging table is fixedly mounted. Four rectangularly distributed uprights are fixedly connected to the upper end of the base. Each of the four uprights has a lifting block slidably fitted onto it. The four lifting blocks are sequentially fixed by four connecting rods. Hydraulic telescopic rods are installed on both sides of the base. Lifting plates are fixedly connected to the telescopic ends of two of the hydraulic telescopic rods. The two lifting plates are respectively fixedly connected to the connecting rods on the left and right sides. A limiting frame is fixedly connected to the upper end of the base, between the forging table and the uprights, forming a slag pool between the limiting frame and the forging table. The advantages are: this invention achieves lower maintenance costs and better performance while ensuring effective clamping and position adjustment of the metal material.

The drum-type roll material cutting forming device comprises an upper rotating shaft, an upper rolling wheel is installed on the upper rotating shaft, cutting dies are evenly arranged on the outer surface of the upper rolling wheel in the radial direction, and the end of each cutting die is provided with an inner cutter face and an outer cutter face which are of an inclined face structure. A blade is formed between the inner cutter surface and the outer cutter surface; a through hole is machined in the position, where the cutting die is located, of the upper roller shaft, and a jacking mechanism used for jacking the center of the to-be-cut part is arranged at the position where the through hole is located. A lower roller is arranged under the upper roller, and the cutting die and the lower roller cut a rubber sheet entering the space between the cutting die and the lower roller in the rotating contact process. The device can be used for cutting a medical rubber sheet to form a frustum gasket, and the outer circle of the frustum gasket is a conical surface, so that the frustum gasket can be reliably attached to the inner cone angle of an aluminum cover, the phenomenon that the vertex angle part of the gasket is extruded and upwarped is avoided, and the assembly quality of the frustum gasket and the aluminum cover is guaranteed.

The powder-liquid mixing bin comprises a tank body provided with an annular partition bin and a first liquid inlet, the annular partition bin comprises an outer peripheral wall and a conical inner peripheral wall which are sleeved with each other, the first liquid inlet is formed in the outer peripheral wall, and a discharging opening is formed in the middle of the upper side of the conical inner peripheral wall and is higher than the upper end face of the conical inner peripheral wall; an outlet is formed in the lower end of the conical inner peripheral wall and connected with a top inlet of a tee joint, an axial inlet of the tee joint serves as a second liquid inlet, and an axial outlet of the tee joint is used for being connected with a mixing pump; liquid entering from the first liquid inlet fills the annular gap between the outer peripheral wall and the conical inner peripheral wall and overflows into the conical inner peripheral wall through the upper end face of the conical inner peripheral wall, so that a circular-truncated-cone-shaped concave part is formed, and powder falls into the circular-truncated-cone-shaped concave part to form a primary mixture; liquid enters the second liquid inlet to take away the primary mixture and convey the primary mixture outwards; the powder-liquid mixing bin achieves the purpose of mixing and is beneficial to mixing and miniaturization at the same time.

The utility model provides a spiral corn milling cutter. The spiral corn milling cutter comprises a cutter body similar to a circular truncated cone shape or an inverted cone shape, a plurality of arc-shaped edge blades and a plurality of linear edge blades, at least two layers of arc-edge blades are arranged on the side face of the cutter body close to the lower end face from bottom to top, and each layer is arranged in the circumferential direction; the multiple linear-edge blades are arranged on the side face of the cutter body in a climbing mode along multiple spiral lines in the axial direction. The arc-shaped edge blade and the linear edge blade are respectively provided with at least one arc-shaped cutting edge, and one linear cutting edge protrudes outwards relative to the side face of the cutter body. The utility model aims to solve the problem that the spiral corn milling mode is single.

An automatic centering bulkhead and primary mold matching structure comprises a primary mold and a bulkhead assembly, two half molds of the primary mold are closed to form a bulkhead matching opening and a bulkhead matching groove, the bulkhead assembly comprises a bulkhead core, a connecting rod and a bulkhead cover, and the bulkhead core is matched with an inclined surface on the bulkhead matching opening through a frustum-shaped first matching inclined surface; the second matching end of the connecting rod is clamped into the matching hole in the choke plug core and then is connected with the choke plug core through a pin penetrating through the first pin hole and the second pin hole, and the connecting rod is connected with the choke plug cover through a nut assembly screwed to the second matching end after penetrating through the connecting through hole in the choke plug cover; and when the choke plug core is assembled on the choke plug matching opening of the primary mold, the annular convex edge of the choke plug cover is just matched with the choke plug matching groove on the primary mold. Through double matching, the centering capacity is improved, matching abrasion is reduced, the service life of the choke plug is prolonged, the size of the choke plug line is reduced, the appearance quality of a final product is improved, and the structure is ingenious, simple and easy to implement.

The invention relates to an inlet section rectification structure for improving intake airflow organization, which comprises an inlet section airflow expansion structure, a rectifier combined with a conical ring and a grating net, and is suitable for flow control mechanisms such as boilers, wind tunnels and the like. The inlet section airflow expansion structure is from narrow to wide, can slow down high-speed airflow in the pipeline and is connected with the pipeline and the boiler; the rectifier comprises an upstream rectifying cone and a downstream rectifying ring, the rectifying cone plays a role in scattering and decelerating the high-speed jet flow, and the rectifying ring is composed of multiple stages of hollow frustum structures with gradually increased diameters and is used for guiding airflow to be uniformly diffused and increasing the airflow uniformity; the grating net further reduces the vortex and adjusts the airflow direction. On one hand, by guiding airflow diffusion, the structure effectively reduces vortexes and flowing dead zones, improves the uniformity of a flow field, and enhances heat exchange and reaction efficiency; and on the other hand, high-speed gas in the pipeline is converted into low-speed gas uniformly distributed in the reactor by the structure, so that the damage of convection impact to subsequent devices is reduced, the influence of carbon deposition and the like is reduced, and the reliability and the working performance of equipment are improved.

A screening device for measuring the inner diameter of pipe fittings includes a control unit, a frame, a feeding unit, an inner diameter measuring unit, and a storage unit. The inner diameter measuring unit includes a measurement drive module and a measuring device. The measurement drive module controls the vertical displacement of the measuring device. The measuring device includes a support, a sorting bar, a pressure sensor, and a height measuring module. The sorting bar has a frustum-shaped structure that is smaller at the bottom and larger at the top. The sorting bar is adapted to the pipe opening of the pipe fitting. When the sorting bar is inserted into the pipe opening and contacts the inner edge of the opening, the pressure sensor changes pressure, and the measurement drive module controls the measuring device to stop moving downward. The height measuring module obtains the height position of the sorting bar and transmits the parameters to the control unit. The control unit determines the outer diameter of the sorting bar at that height position based on the height position of the sorting bar, and then measures the inner diameter of the pipe fitting.

The invention discloses automatic mounting equipment and method for a C-shaped clamping ring, and aims to solve the technical problem that a tiny and holeless C-shaped clamping ring is difficult to manually mount due to the need of pre-expansion. The equipment comprises a base used for positioning a workpiece assembly, a clamping mechanism used for clamping a pin shaft, a downward pressing mechanism used for applying downward pressing force, and an auxiliary mounting cap serving as a key tool. The outer surface of the auxiliary mounting cap is in a frustum shape, and the pressing mechanism drives the pressing head to push the C-shaped clamping ring to expand smoothly along the surface of the frustum and finally clamp the C-shaped clamping ring into a target clamping groove of the pin shaft. According to the invention, a complex expansion installation process is converted into a simple linear pressing action, automation is realized, the assembly efficiency and reliability are obviously improved, processes such as pin shaft press fitting can be integrated, and the method has very high industrial application value.

To facilitate the construction and removal of a space structure.SOLUTION: A spatial structure 7 constituting a high evacuation space is constructed by placing a foundation block 1 provided with a plurality of frustum-shaped through-holes 11 penetrating from an upper surface 14 to a lower surface 15 on a surface of a leveled ground 6, and closing the through-holes 11 of the foundation block 1 with a lower surface 211 of a bottom slab 21 of a box culvert 2 placed on the upper surface 14 of the foundation block 1 in a state where crushed stones 4 are charged into each of the through-holes 11 of the foundation block 1.SELECTED DRAWING: Figure 6

This invention discloses a quick-change suction cup component, designed to address the technical problem in existing technologies where suction cups need to be replaced frequently for various reasons. However, replacing ordinary suction cups takes time, and this wasted time can lead to product scrap, reduced cycle time, and equipment downtime. The suction cup component includes a suction cup, a vacuum chamber, and a through-hole. A threaded connector is connected to the bottom of the suction cup, and a threaded sleeve is inserted into the threaded connector. A magnetic ring is connected to the inner wall of the threaded sleeve, and a connector sleeve is connected to the outer surface of the threaded sleeve. A frustum-shaped base is fitted onto the bottom of the connector sleeve and is connected to the surface of the vacuum chamber. In this suction cup component, the suction cup can be installed at the end of the threaded sleeve via a threaded connection between the threaded sleeves, and then mounted on the frustum-shaped base via the connector sleeve. Rotating the threaded sleeve allows the suction cup to be removed.

The utility model relates to the technical field of gear shaping machines, and provides a gear shaping machine locking mechanism which comprises a bottom plate, a circular truncated cone is movably connected to the center of the top of the bottom plate, a supporting column is fixedly connected to the top of the circular truncated cone, and a rotating plate is fixedly connected to the top of the supporting column. According to the utility model, firstly, a workpiece to be processed is placed between the two clamps, then the two clamps are used for clamping the workpiece, and then the controller is used for starting the main shaft assembly, so that the main shaft assembly drives the cutting tool body to cut the workpiece; a worker reversely rotates a hand rocker firstly, the hand rocker drives a screw rod to rotate reversely, a moving plate gradually moves vertically downwards along the screw rod through continuous reverse rotation of the screw rod, at the moment, movement of the moving plate is limited through two square grooves, and therefore a workpiece can be better locked, the workpiece is prevented from rotating disorderly in the cutting process, and the work efficiency is improved. And the cutting efficiency of the locking mechanism of the gear shaping machine is improved.

The invention relates to the technical field of casting, in particular to a high-pressure molding high-exothermic riser with a fixing mechanism, which comprises a shell layer, a thermal insulation layer and a first heat agent bag, the shell layer is of an inverted-truncated-cone-shaped hollow structure, and openings are formed in the upper end and the lower end of the shell layer. The heat preservation layer is located on the inner wall of the shell layer. An isolation pipe is arranged at the top end of the shell layer; the upper end of the isolation pipe is fixedly connected with the shell layer, the upper end of the isolation pipe and an opening in the upper end of the shell layer are located at the concentric position, and a circulation opening is formed in the upper side of the isolation pipe; a gap is reserved between the lower end of the isolation pipe and the shell layer, so that molten metal can flow through the gap; by arranging the isolation pipe, molten metal circulates in the shell layer and interacts with buoyancy of the slag, the effect of accelerating upward movement of the slag can be achieved, and therefore the situation that the upward floating speed of the slag is low, and the slag is supplemented into a casting along with the molten metal in the shell layer is reduced.

The utility model provides a fixator and a pair of cross-country ski shoes comprising the same, relates to the technical field of ski shoes, and solves the technical problems that the ski fixator needs to be manually locked or released, is inconvenient to use and is unstable in operation during unlocking. The fixator comprises a pedal, a lock rod part, a supporting piece, a fixing hook, a reset spring and a release piece. A stick inserting groove is formed in the side, away from the rotating shaft, of the top of the releasing piece and is of an inverted frustum-shaped structure or an inverted half-pace-shaped structure. According to the snowshoe, the snowshoe can be loosened by inserting the head of a snowstick into the snowstick inserting groove, stooping operation is not needed, the snowstick inserting groove is arranged to be of an inverted frustum-shaped or inverted half-pace-shaped structure, guiding during insertion of the snowstick is facilitated, and unlocking failure caused by inclined insertion is prevented.

This invention relates to the field of welding equipment, specifically to a welding device and method for German-style bridges. The welding device for German-style bridges includes: a fixed clamping structure comprising a fixed body and a fixed oil seal positioning sleeve mounted on the fixed body; a movable clamping structure comprising a movable body and a movable oil seal positioning sleeve mounted on the movable body; a lifting and adjusting structure comprising a lifting seat arranged between the fixed body and the movable body, and a limiting seat and rollers mounted on the lifting seat; a base plate positioning structure comprising a positioning bushing mounted on the fixed body and the movable body, an expansion sleeve arranged at one end of the positioning bushing, a telescopic tension rod arranged within the positioning bushing, and a frustum-shaped portion arranged at the end of the tension rod and cooperating with the expansion sleeve; a ball support positioning structure; and a gas chamber support positioning structure. The welding device for German-style bridges of this invention simplifies the welding process, reduces repetitive positioning, and improves welding efficiency and welding accuracy.