94results about How to "Reduce casting difficulty" patented technology

The invention relates to a small-sized five-axis machining center which comprises a base structure (1), an XYZ vertical shaft structure (2) and a BC rotary table (3). The small-size five-axis machining center is characterized in that the base structure (1) is L-shaped and comprises an X-axis substrate (1-2) and an internally hollow machine tool base (1-1); the X-axis substrate (1-2) is arranged on the machine tool base (1-1) and the X-axis substrate and the machine tool base are of integral structures or fixation connection molding structures; an X-axis ball screw (1-3), a Y-axis ball screw (2-6), a Z-axis ball screw (2-4), two X-axis guide tracks (1-4), two Y-axis guide tracks (2-7) and two Z-axis guide tracks (2-5) are arranged on the X-axis substrate (1-2); the BC rotary table (3) is arranged on a table plate of the machine tool base (1-1) and is arranged beside the positive plane of the X-axis substrate (1-2); a funnel-shaped structure chip discharge port (1-5) is arranged on the table plane of the machine tool base (1-1); and a connecting hole (1-6) of the BC rotary table (3) is arranged at the positive plane of the X-axis substrate (1-2). The small-sized five-axis machining center has the characteristics of being convenient to operate, high in production efficiency, low in cost and attractive and harmonious.

The invention relates to a small-sized six-axis linkage knife grinding device which is characterized by comprising a small-sized rack, a device body, a knife grinder and a six-axis linkage mechanism. The six-axis linkage mechanism is composed of a Y-axis moving mechanism, an X-axis moving mechanism, a Z-axis moving mechanism, an A-axis rotating mechanism, a B-axis rotating mechanism and a C-axis rotating mechanism. The knife grinder is driven by the X-axis moving mechanism and the Y-axis moving mechanism to perform linear movement, the movement trail of the Y-axis moving mechanism is perpendicular to the movement trail of the X-axis moving mechanism, and a knife installation unit is arranged on the C-axis rotating mechanism. The Z-axis moving mechanism is driven by the B-axis rotating mechanism to rotate around the B axis, the C-axis rotating mechanism is driven by the Z-axis moving mechanism to move front and back along the Z axis, the knife installation unit is driven by the C-axis rotating mechanism to rotate around the C axis, and the small-sized six-axis linkage knife grinding device is accordingly formed. The small-sized six-axis linkage knife grinding device has the advantages of being simple in structure, small in size, light in weight, multiple in grinded knife variety, wide in application range, capable of being used for small-sized machining production and capable of being used for teaching.

The invention provides a method for designing a submersible axial-flow pump guide vane and a submersible axial-flow pump guide vane. According to the method, the entry guide vane hub diameter Dh, the entry guide vane outer diameter D2, the guide vane entry inclination angle epsilon1, the guide vane inner side divergence angle alpha, the guide vane outer side divergence angle beta, the guide vane inner flow line length alpha1 and the guide vane outer flow line length beta1 of the submersible axial-flow pump guide vane are determined on the basis of the hub diameter and the guide vane outer diameter of a submersible axial-flow pump guide vane wheel. Design can be rapidly achieved, manpower is saved, and the performance curve of the submersible axial-flow pump guide vane coincides with a required performance curve. Compared with a traditional design method for a submersible axial-flow pump guide vane, lift and efficiency are improved, ranges of efficient areas are widened, and operational reliability of the submersible axial-flow pump guide vane is improved.

The invention discloses a gas turbine guide vane. The gas turbine guide vane comprises a vane body, a single inner cavity is further formed in the vane body, an impact pipe communicating with a cold air loop is installed in the inner cavity, a jet flow slit penetrating through the front edge of the impact pipe is formed in the front edge of the impact pipe, and the jet flow slit is used for allowing cold airflow in the inner cavity to penetrate through and then conducting jet flow impact cooling on the inner wall face of the blade-shaped front edge. The outer wall face of the blade-shaped front edge is further provided with a plurality of crossed air film hole sets penetrating through the blade-shaped front edge, first air film holes in the crossed air film hole sets are perpendicular to the outer wall face of the blade-shaped front edge in the blade-shaped section, and included angles of 30-60 degrees are formed between the first air film holes and the blade-shaped section. According to the gas turbine guide vane, the casting difficulty of the guide vane can be greatly reduced, the cooling effect is better, the temperature field is more uniform, and the diffusion of cold airflow can be reduced, so that under the condition of the same gas amount and cold air amount, the covering effect of a gas film formed by the cold airflow on the outer wall face of the blade-shaped front edge is better, and the cooling effect is better.

The invention discloses a low-temperature air cylinder working chamber component structure of a liquefied natural gas vapor compressor. The low-temperature air cylinder working chamber component structure of the liquefied natural gas vapor compressor comprises an air cylinder, a piston and a piston rod. A cylinder body of the air cylinder is of a single-wall cylinder type with two open ends, two air inflow valve cages located at the two ends of the cylinder body are arranged at the upper end of the cylinder body, and two air release valve cages located at the two ends of the cylinder body are arranged at the lower end of the cylinder body. According to the low-temperature air cylinder working chamber component structure of the liquefied natural gas vapor compressor, the air cylinder is of a single wall structure, the structure is simple, and casting is facilitated. The valve cages can be cast and formed together with the air cylinder body, and the valve cages can also be welded to the air cylinder by combining plurality of steel plates in a welding method. Due to the fact that the air cylinder body only has the single wall, heat conducted to an upper air suction part through an exhaust part with high temperature during operating can be reduced, inflowing air is effectively prevented from being heated, and more energy is saved in the compressing process. The outward ends of the air inflow valve cages and the outward ends of the air outflow valve cages are open, a plurality of fastening screw holes are formed, an air cylinder cover also serves as outer walls of the valve cages, bolts are used for fastening, and casting difficulty can be further lowered.

The invention discloses a lubricating device for a high-speed bearing in a disc separator. The lubricating device comprises a vertical shaft, an oil inlet connector and an oil outlet connector. A coupling and a bearing block are sleeved on the vertical shaft. An oil slinger, at least one upper bearing, a spacer and a lower bearing are sequentially disposed on the vertical shaft inside the bearing block. A lower locking cap is disposed on the vertical shaft at the lower end of the bearing block. A belt pulley matching with the bearing block is connected to the tail end of the vertical shaft through a nut. The coupling is provided with a radial oil inlet. The upper end face of the bearing block is provided with a slant hole which deviates from the axis of the vertical shaft. The upper end of the slant hole is communicated with the oil outlet connector. An oil skimmer is connected to the lower end of the bearing block and is provided with a skimming hole. The skimming hole is communicated with the slant hole through a communicating hole in the bearing block. A gap is formed between the skimming hole and the inner wall of the belt pulley. The skimming hole radially deviates from the vertical shaft. The lubricating device has the advantages of good lubricating effect, long service life, simple structure, convenience in maintenance and low cost.

The invention relates to an ammonia oxidation stove consisting of a novel platinum net bracket-based catalyst frame and a supporting structure thereof; a concrete vertical column is erected at the center of a pipe box in front of an oxidation furnace/waste boiler; furthermore, the upper end of the concrete vertical column supports a bracket which is provided with screens so as to form a CDM catalyst frame; the CDM catalyst is provided with a platinum net; the circumference of the bracket-based catalyst frame is heat-insulated by a ceramic fiber blanket; when the CDM catalyst is not loaded, the screen is canceled and the platinum net is directly arranged on the bracket. The ammonia oxidation stove has the advantages that the bracket is made of high-temperature alloy HP-Nb or HK-40 which generates no high-temperature oxidation even under a use state of high temperature; furthermore, the bracket has enough bending section modulus under the use temperature, has simple structure and smaller manufacture difficulty; furthermore, the ammonia oxidation stove completely meets the requirement of installation of the platinum net and the filling of a catalyst which is used for emission reduction of N2O for the newly increased CDM project, leads the platinum net and the catalyst to be the best condition of horizontal surface when in use, ensures the platinum net and the catalyst to achieve the normal design service life; the ammonia oxidation stove belongs to maintenance-free design, and reduces the shutdown maintenance time of the system, the maintenance expense and the heat dissipation loss of the oxidation stove.

The invention provides a hydrodynamic retarder. The hydrodynamic retarder comprises a turning wheel and a fixed wheel, wherein blades of the turning wheel and the fixed wheel are U-shaped and are arranged along the radial directions of the turning wheel and the fixed wheel; the U-shaped blades of the turning wheel and the fixed wheel are arranged in opposite directions; oil fluids in an inner ring and an outer ring of a hydrodynamic circulating cavity are fully centralized to a place with the largest axial hydrodynamic circulating circle for impacting and stirring; the front end of each blade is thin and the middle part of each blade is thick; a taper oblique angle is formed at the front end of each blade; the upper surface of each blade is an arc-shaped; the semicircular arc-shaped surface on the upper surface of the two U-shaped blades arranged in opposite directions forms another circulating circle between the turning wheel and the fixed wheel; stirring circulating impact can be carried out on the upper part of the blade to further enhance mutual impact of liquid flow; the casting connection area between the U-shaped blades, the fixed wheel and the turning wheel is large; the two sides of eawch blade are similar to two support ribs so as to enhance the rigidity of the blades; the structure is firm and unlikely to be damaged; and by increasing the diameter of the circulating circle, the axial size of the whole transmission is reduced, the occupation space is small, and the casting difficulty is low.

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.

The invention discloses a component for combining a bearing pedestal and a front frame and a wind generating set. The component comprises a front frame portion and a bearing pedestal portion which areintegrally cast. The front frame portion comprises a top plate, a bottom plate, and a first supporting portion, a second supporting portion and a third supporting portion which are located between the top plate and the bottom plate. The top plate is provided with a first end portion, a second end portion opposite to the first end portion, a first side portion, and a second side portion opposite to the first side portion. The bearing pedestal portion is located at the first end portion of the top plate. The first supporting portion and the second supporting portion are used for supporting thefirst side portion and the second side portion of the top plate correspondingly. The third supporting portion is used for supporting the middle of the top plate. The component adopts a three-fulcrum (the first supporting portion, the second supporting portion and the third supporting portion) carrying structural form, the using amount of materials is greatly reduced and the weight is lowered whilethe strength and stability of the component are guaranteed, meanwhile, the third supporting portion is the main connection section and adopts circular arc transition and a thin-walled structure, force transmission is guaranteed, and furthermore, the materials are efficiently utilized.

The invention relates to the field of fluid machines, and provides a multistage centrifugal pump delivery chamber which is small in axial size and easy to cast and assemble. The multistage centrifugal pump delivery chamber comprises a first annular runner, a diffusing section and a second annular runner located on the outer side of the first annular runner. The second annular runner is formed in the inner side of a shell and located at an outlet of a first final-stage guide vane. The areas of all sections of the second annular runner are equal. The first annular runner is formed by matching a rear cover plate of the first final-stage guide vane and a rear cover plate of a second final-stage guide vane. The diffusing section is in a horn shape, is located on one side of the second annular runner, and communicates with the second annular runner.

The invention discloses a machining method for a box cover of a gearbox which can reduce the machining time, lower the machining cost, and improve the product quality. The machining method comprises the following steps: step (1) casting the box cover and forming a high-speed shaft hole phi A and a low-speed shaft hole phi B in the box cover; step (2) ensuring a center distance L between the high-speed shaft hole phi A and the low-speed shaft hole phi B, and finish machining the high-speed shaft hole phi A and the low-speed shaft hole phi B; and step (3) ensuring a center distance L1 between the low-speed shaft hole phi B and a gear pump hole phi C, drilling the gear pump hole phi C, and then boring the gear pump hole phi C.