94results about How to "Good strength and rigidity" patented technology

This invention relates to a portable pushing car for checking railway, with such geometric parameter as railway gage, cant, triangle pit, including mechanical structure in I-shaped and three-point framework, electric source, induction testing, controlling and displaying sections. The bearing bogie structure, closing structure, hand button rod, measuring mechanism, controlling system, electric source, displaying box and various sense organs are mounted on main beam crossed on two-railway, three rollers and their mechanism which is both bearing and bogie. On one side of closing mechanism there is position closing wheel, on the other side there is retractable pressure resistant wheel used to make king piece and railway erect, and close to the inside of the railway. This advantages are light weight, stability, slight shaking and corrosion resistance.

An alkaline battery separator comprising an alkali-resistance synthetic fiber, a fibrillated organic solvent-spun cellulose fiber having a Canadian standard freeness value of 10 to 280 ml, and a mercerized pulp having a Canadian standard freeness value of not less than 550 ml is prepared. In the separator, the proportion of the alkali-resistance synthetic fiber, the proportion of the fibrillated organic solvent-spun cellulose fiber, and the proportion of the mercerized pulp relative to the total amount of the separator are respectively 25 to 62% by mass, 5 to 25% by mass, and 33 to 50% by mass, provided that the total amount of the separator is 100% by mass. The alkali-resistance synthetic fiber may comprise a polyvinyl alcohol-series fiber having an average fiber fineness of not more than 1 dtex. The alkaline battery separator may further comprise a polyvinyl alcohol-series binder in a proportion of 3 to 20% by mass relative to the total amount of the separator. The alkaline battery separator of the present invention may have a shrinkage by the of not more than 3.5% after immersing in an aqueous solution of potassium hydroxide having a concentration of 40% by mass at 80°C for 24 hours and a stiffness strength of not less than 2 N.

An inverted tricycle, which includes: deflecting and steering mechanism, rear frame, driving wheel, two front wheels, said deflecting and steering mechanism configured on the front end of said rear frame, said two front wheels and said deflecting and steering mechanism connected to each other, and symmetrically configured on the left and right sides of the front end of said rear frame, with the rear frame as the axis of symmetry, said driving wheel configured on the rear end of said rear frame. By adopting the above technical scheme, the left and right rocker arms are hinged to the main frame along the same axis. When the tricycle is turned or tilted, they can be always parallel to each other, and the driving will be more stable. The left and right rocker arms are two independent gravity center deflection systems that will not interfere with each other; meanwhile, the structure with single damper can greatly reduce the manufacturing cost of the present invention.

The invention provides a stamping and molding process of automobile roof covers. In a process of drawing and forming, a flanged hole is formed in a blank line; the flanged hole can be used as a positioning hole in the subsequent process; the position of the flanged hole can be used as waste and cut in the subsequent process. The invention also provides a stamping die. The stamping and molding process of the automobile roof covers can improve the positioning accuracy in the process of stamping and molding the automobile roof covers.

The invention discloses a double-main-shaft double-working-table gantry type heavy wood composite processing center comprising a bed body, double working tables, an X-Z-shaft sliding table, a double-main-shaft machine head, a vacuum pump component, a control cabinet and an electricity box, wherein the bed body comprises a base, a vertical column and a cross beam, the double working tables are arranged on a Y-shaft guide rail of the base side by side, each working table respectively comprises a sliding base, a hood cover, a working table panel component and a connecting side frame, a Y-axial sliding block is arranged at the bottom of the sliding base and is adapted to the Y-shaft guide rail, and the Y-axial sliding block and the Y-shaft guide rail are both hidden in the hood cover; and the double-main-shaft machine head is adapted to the X-Z-shaft sliding table in a sliding manner by virtue of a Z-shaft sliding plate, the X-Z-shaft sliding table is adapted to the X-shaft guide rail of the cross beam, and the double-main-shaft machine head comprises a gang drill component, two main shaft components and two tool magazine components. Therefore, processes of cutting and sawing, engraving and milling, slotting, vertical drilling and horizontal drilling of two parts can be completed by virtue of one-time clamping and continuous compounding, and moreover, the parts can be respectively processed and clamped on the two working tables synchronously, so that the manufacturing time can be saved, and the production efficiency can be improved.

The invention discloses a linear easy-to-tear composite film, which comprises inner layers and an outer layer from inside to outside, wherein the outer layer is made from PET (polyethylene glycol terephthalate) plastic; the inner layers are an inner layer A and an inner layer B; the inner layer A is made from a blend of a cycloolefin copolymer B and polyvinyl at the mass ratio of (1-4.2):(1-4.8);the inner layer B is made from a blend of a cycloolefin copolymer A and an ethylene-vinyl acetate copolymer at the mass ratio of (1-9.5):(1-10.5); the cycloolefin copolymer A is prepared by copolymerizing ethylene and 51-55% of norbornene by mole percent; and the cycloolefin copolymer B is prepared by copolymerizing ethylene and 30-34% of norbornene by mole percent. The linear easy-tear type composite film has the benefits of good linear tearing property, good strength, good rigidity, excellent transparency, good heat resistance, excellent drug resistance and hydrolysis resistance, excellent environmental performance, uniform thickness and high cost performance.

The invention relates to a new energy vehicle battery pack assembly and a new energy vehicle. The battery pack assembly comprises an upper housing, a lower housing and a battery module; the inner sidefaces of the upper and lower housings are provided with symmetric framework structures; battery modules are fixedly arranged in the framework structures of the inner side faces of the upper and lowerhousings. According to the new energy vehicle battery pack assembly and the new energy vehicle, the battery pack assembly is simple and compact in structure, high in safety performance, strong in loading capacity, convenient to the install and dismantle and high in universality, the fastening of the battery modules can be achieved, the requirements of the installation reliability of the battery modules are met to greatly improve the vibration resistance and anti-impacting performance of the battery modules and the battery pack assembly, the overall structure of the battery pack assembly is simple, the processing and the assembling are convenient and easy, the rigid strength is high, the battery pack assembly is easy to process and produce, the barycenter and stability of a vehicle body are not affected, and a light-weight designing concept is thoroughly presented.

The invention discloses toughened environmental-friendly back mesh glue as well as a preparation method and application thereof. A component A is prepared from the following components in parts by weight: 45-65 parts of dicyclopentadiene modified unsaturated polyester resin, 25-40 parts of bisphenol-A epoxy vinyl ester resin, 10-15 parts of hyperbranched unsaturated polyester, 1-2.5 parts of a dispersant, 5-10 parts of a core-shell particle toughening agent, 25-40 parts of spherical fine silicon powder, 15-25 parts of nano calcium carbonate, 0.2-0.8 part of an accelerator and 0.02-0.08 part of a polymerization inhibitor. A component B is prepared from the following components in parts by weight: 10-70 parts of a solidifying agent, 30-40 parts of a blending agent, 30-50 parts of an inorganic filler and 3-10 parts of a stabilizer. After the component A and the component B are mixed, the solidifying agent accounts for 0.5-3.5 percent of the total weight of the mixture. The back mesh glue is small in viscosity, good in permeability, moderate in rheology and low in content of total volatile organic compounds (VOCs); and the mechanical strength, particularly the impact resistance, of a back mesh stone is remarkably superior to that of the existing product.

A terminal matching structure with self-cleaning function is prepared as setting a corresponding slope and convex arc separately on terminals being lap-jointed with each other, enabling to form relative friction when terminals are lap-jointed with each other, utilizing contact friction of terminal contact surfaces to generate self-cleaning function for ensuring terminal to have an excellent contact ability.

The invention relates to an L-type portal installation frame which comprises a supporting frame body and a vertical frame body. The vertical frame body is vertically installed on the supporting frame body, and the supporting frame body is divided into a left portion used for placement of a balance frame and a right portion used for placement of a hanging basket platform. The vertical frame body comprises a first vertical tube and a second vertical tube, the first vertical tube and the second vertical tube are located on two sides, a plurality of transverse tubes are arranged between the first vertical tube and the second vertical tube, and the right end of the supporting frame body is provided with a pressing plate used for positioning the hanging basket platform. The L-type portal installation frame has the advantages of being simple and compact in structure and good in rigidity and strength due to a double-tube structure, overcoming the defects that the gravity center of the installation frame deviates and a hanging basket inclines forwards by means of arrangement of the balance frame and being convenient to use, wide in applicable range, capable of allowing hanging basket platforms with a single-person hanging basket, a segmented hanging basket and other hanging baskets of various specifications to be used.

The invention provides a drain pipe underwater connection construction method. The method comprises the following steps that a new drain pipe is arranged, and the two ends of the new drain pipe extendto the position of an old drain pipe; jet grouting piles are built at the two ends of the new drain pipe, and a connection well is dug in each jet grouting pile through a top-down construction method; the reinforced concrete structure between the new drain pipe and the old drain pipe is forcibly broken underwater, and the new drain pipe is communicated with the old drain pipe; after most of sewage in the old drain pipe is discharged from the new drain pipe, the two ends of the old drain pipe are blocked underwater, and the old drain pipe is removed. The method has the advantages of being highin safety and reliability, high in universality, high in construction efficiency and the like.

This invention relates to brake gap adjusting double chuck clamp gas pressed brake device, which comprises the following scheme: One brake clamp and brake rack connected through slide pair; the inner and outer brake underlay are paralleled down the brake clamp with certain distance and rely against the brake rack through spring on the pressure board; the brake clamp top has brake gas chamber with bar connected to the stick, wherein, the said brake clamp inside chamber has double chuck gap adjusting structure connected to the down cover board to the brake clamp; the other end of the bar has semi-circle block connected to brake clamp through semi-circle block.

The invention relates to a dynamic gap type screw press comprising a spiral auger driven by a speed reducer and front and rear flange sleeves for supporting the spiral auger, wherein moving and static sheet groups matched with the spiral auger are arranged between the front flange sleeve and the rear flange sleeve; the front flange sleeve is provided with a feed opening; the rear flange sleeve is provided with a discharge opening; the spiral auger consists of a tapered shaft and blades; the outside diameters of the blades are equal; the screw pitches of the blades are equal; the inside diameters of the moving and the static sheet groups are greater than the outside diameter of the blades of the spiral auger; and the inside diameters of moving blades of the moving and the static sheet groups are smaller than the outside diameter of the blades of the spiral auger. According to the invention, sludge is propelled and extruded in the moving and the static sheet groups by the spiral auger consisting of the tapered shaft and the equidistant blades so as to realize the solid-liquid separation. The dynamic gap type screw press has simple structure and is convenient to process and stable for dehydration and has long service life; the equidistant blades have high rigidity; and the moving and the static sheet groups have the functions of draining, automatically cleaning, preventing blockage and the like.

The invention relates to a lawn parking space allowing a car to park on the roadside lawn and solves the problem of difficulty in parking of the car in society. A frame hinged to the lawn base is designed, guide wheel groups are mounted on two sides of the frame, driving chains, driving chain wheels, an upper driven chain wheel and a lower driven chain wheel are mounted on the frame, the driving chains are in tractive connection with a car loading board, and upper guide rails and lower guide rails mounted on the car loading board can move on the frame; power-driven, hand-cranking and foot-stepping driving mechanisms are mounted at the rear end of the frame; a limit stabilizer is mounted in the loading and unloading position of the car loading board on the road; loading and unloading guide plates on two sides of the car loading board can be in a form of turning plates. The lawn parking space has the beneficial effects as follows: parking on the roadside lawn at night is realized, furthermore, the lawn ecology is not influenced, turning backing-up is not needed during car parking and taking, one-key control is realized, the lawn parking space can be used through hand cranking or foot stepping when losing power, the structural operation is stable, the occupied area is small, and the lawn parking space is equipment capable of solving the problem of difficulty in parking of the car.

The invention relates to a multi-disc frame saw assembly which comprises a frame saw and a workbench. The frame saw comprises a walking frame capable of walking on longitudinal rails and a sawing machine. Two transverse rails perpendicular to the longitudinal rails are arranged on the walking frame and provided with a walking crossbeam, and the sawing machine is arranged on the walking crossbeam. The workbench comprises a gantry frame, first-layer rails and stone carrying vehicles. The two transverse guide rails are each provided with a lead screw and a transverse linear guide rail side by side, and the walking crossbeam is driven by the lead screws to move for fragmentation. The two longitudinal rails are each provided with a gear row and a longitudinal linear guide rail side by side, and the walking frame is driven by gears mounted at the four corners to move. Two pairs of first-layer rails are arranged on the ground of the workbench, second-layer rails are arranged in an end sinking groove of the workbench, and a transfer vehicle walking on the second-layer rails is connected with the stone carrying vehicles on the first-layer rails. Cutting and stone loading and unloading are achieved at the same time, and high-efficiency running without interference is achieved.

The invention discloses a plastic crossbeam pipe column structure. The plastic crossbeam pipe column structure comprises a pipe beam, wherein a first connecting piece, a second connecting piece and a third connecting piece are arranged on the pipe beam; a concave fixing seat is arranged at the end part of the second connecting piece; the fixing seat is embedded in the second connecting piece to be integrally formed, and is connected with a rotating shaft of a steering wheel; a first bracket and a second bracket are respectively arranged at two free ends of the pipe beam; and a central control iron piece is arranged in the middle of the pipe beam, and is arranged between the first connecting piece and the second connecting piece. According to the plastic crossbeam pipe column structure disclosed by the invention, the basic pipe beam and the bracket parts adopt an integrated forming and plastic injecting technology; the plastic crossbeam pipe column structure has good strength and good rigidity in different temperatures and different humidity, and is low in warping and high in dimension stability; and compared with a crossbeam pipe column made from conventional materials, a plastic crossbeam pipe column disclosed by the invention has the advantages that the weight is reduced by 40%, and the cost is reduced by 15%.

The invention discloses a special impact-resistant aging-resistant material for a bumper. The special impact-resistant aging-resistant material is prepared from the following raw materials in parts by mass: 88-95 parts of polypropylene, 8-10 parts of ethylene-propylene diene copolymer rubber, 2-3 parts of nanometer rubber, 3-8 parts of a vulcanizing agent, 5-8 parts of a styrene-butadiene copolymer, 0.1-2 parts of an antioxidant 1010, 18-22 parts of a mineral filler and 1-2 parts of a foaming agent. The special material disclosed by the invention has the beneficial effects that the special material has high impact resistance, corrosion resistance, high rigidity and strength and is difficult to age, the used polypropylene is low in density, and the development of automobile lightweight at the present stage is met.

The invention discloses a high strength rigid pulley rope for a two dimension code knitter and a preparation method thereof. The high strength rigid pulley rope for the two dimension code knitter comprises a carbon fiber rope and a coating adhered to the surface layer of the carbon fiber rope. The coating contains epoxy resin, butyl methacrylate, ethyl acetate, isopropanol, methyl isobutyl ketone and dialkyl group adipate ester, wherein relative to 100 weight parts of the epoxy resin, content of the butyl methacrylate is 50-100 weight parts, content of the ethyl acetate is 10-30 weight parts, content of the isopropanol is 50-100 weight parts, content of the methyl isobutyl ketone is 10-30 weight parts, and content of the dialkyl group adipate ester is 10-30 weight parts. By adopting the above design, the coating costs the surface of the carbon fiber rope, equipment maintenance problems caused by long time wear are greatly avoided, use life of the high strength rigid pulley rope for the two dimension code knitter, when used to knit a two dimension code pattern, is greatly prolonged, and production cost is reduced.

The invention discloses a key structure, which comprises a key cap, a bottom plate, an elastic body, a thin film switching circuit, a first supporting seat, a second supporting seat, a first metal supporting piece and a second metal supporting piece, wherein the first supporting seat and the second supporting seat are arranged on the bottom plate and are respectively provided with a first side wall and a second side wall; and the first pressing part and the second pressing part of the first metal supporting piece and the second metal supporting piece are connected with the key cap and are rotatably connected with the first side wall and the second side wall via a first L-shaped bending part and a second L-shaped bending part respectively. When the key cap is pressed, the key cap abuts against the first pressing part and the second pressing part from an un-pressed position, the first metal supporting piece and the second metal supporting piece are driven to rotate around the first side wall and the second side wall respectively, and the first supporting and leaning part of the first metal supporting piece and the second metal supporting piece lean mutually and rotate in a linked mode. When the key cap is released, the elastic body provides an upward recovery force to drive the key cap to be recovered to the un-pressed position. Due to arrangement of the thin first metal supporting piece and the second metal supporting piece, thin applications of the key structure is facilitated.

The invention relates to a hydrostatic pressure type numerical controlled surface grinder with a horizontal spindle and a rotary table. In the conventional surface grinder, the spindle of a grinding head mechanism has lower rotary accuracy, and the working reliability is poor. The hydrostatic pressure type numerical controlled surface grinder with the horizontal spindle and the rotary table is characterized in that: the grinding head mechanism comprises a spindle, wherein a sleeve is sleeved outside the spindle; two ends of the sleeve are provided with angle contact bearings matched with the spindle; a grinding head body is arranged outside the sleeve; a gap is reserved between the sleeve and the spindle; and a tube joint for filling oil fluid into the gap is arranged on the sleeve. When the hydrostatic pressure type grinding mechanism works, sufficient oil fluid is always filled in the cavity of the grinding mechanism, so that the spindle has better rotary accuracy and can keep stability and reliability in a larger speed variation and loading range all the time, the spindle gear system has good rigid strength and is stable and reliable during working, and the temperature rise is effectively reduced.

The invention discloses medium-anti-impact polystyrene resin and a preparation method thereof. The resin is prepared from the following raw material ingredients in percentage by weight: 85 to 96 percent of styrene monomers, 1 to 6.5 percent of mixed rubber, 1 to 8 percent of flowing modifying agents and 1.5 to 7 percent of superfine powder, wherein the mixed rubber is prepared from two or three kinds of rubber in rubber with the solution viscosity being 140 to 190 cps, rubber with the solution viscosity being 70 to 100 cps and rubber with the solution viscosity being 20 to 50 cps. A polymerization method is used for replacing a mixing method to obtain the medium-anti-impact polystyrene resin; the cooperated effect of a PS body, rubber and ultrafine powder body is sufficiently achieved; onthe premise of ensuring the intensity, the consumption of the toughening agent rubber is possibly reduced, so that the intensity, the rigidity, the flowing performance and the luster degree of the product can be properly improved; the requirements of users on the medium-anti-impact product can be met; the mass production is easy.

The invention relates to a flexible circuit board which is used for chip package and a chip package structure. The provided flexible circuit board comprises a first conductive layer, a second conductive layer and a first insulation layer. The first insulation layer is located between the first conductive layer and the second conductive layer. The first conductive layer comprises a number of pads. A number of pads are electrically connected with a chip through leads. A region surrounded by a number of pads forms a chip bonding region. The chip bonding region is used for chip bonding. The thickness of each pad is defined to be T1, and the thickness of the first insulation layer is defined to be T2, wherein 63 microns<=(T1+T2)<=87 microns, and 0.44<= (T1 / T2) <=0.64.

The invention relates to a liquid collecting ring on the body part of a thrust chamber of a liquid rocket engine. The liquid collecting ring comprises an upper liquid collecting ring cover (1) and a lower liquid collecting ring cover (2), and a radial hole (7) and a collection slot (8) are formed in the lower liquid collecting ring cover (2). The cross section of the upper liquid collecting ring cover (1) takes the shape of an elliptical arc, and a concave slot is formed in the cross section of the lower liquid collecting ring cover (2). The upper liquid collecting ring cover (1) and the lowerliquid collecting ring cover (2) are connected to form a liquid collecting chamber (6), and the liquid collecting chamber (6) communicates with the collection slot (8) through the radial hole (7). The liquid collecting ring has the advantages of good flow equalization, small pressure loss and good strength and rigidity and can also solve the problem that the welding airtightness of a steel jacket(3) and the body part of the thrust chamber is poor in the prior art.

The invention discloses a sealing valve which comprises a box body, a cylinder body extending into the box body, a valve seat fixedly arranged at an outlet of the cylinder body, a valve plate covered on the valve seat to play a sealing role and a valve plate opening and closing device for controlling the valve plate to act. The invention has the beneficial effects that the valve plate opening andclosing device adopts a crank structure and is in transmission with a synchronizing device; the action of first translation and then turnover of the valve plate is realized, so that the device structure is effectively simplified, the movement space of the valve plate is reduced, and the power consumption is reduced; the two ends of a transmission arm with a U-shaped structure of the valve plate are respectively connected with a crank to form a simply-supported beam structure; compared with a transmission arm with a cantilever beam structure in the prior art, the transmission arm has better stress condition, better rigidity and intensity and is not easy to deform or break; meanwhile, each of transmission half shafts of the valve plate adopts a transmission structure of a bilateral solid shaft; and compared with a unilateral hollow shaft in the prior art, the solid shaft has a coaxial transmission structure, is simpler in structure and has low manufacturing and maintenance difficulty.

The invention relates to a double-end jaw-type wheel pair withdrawal machine which comprises a base, a left handpiece, a right handpiece, a left main oil cylinder, a right main oil cylinder, a workbench, a detection system, a hydraulic system and an electric control system; both ends of the base are respectively provided with U-shaped handpieces which are oblique for a certain angle; the main oil cylinders are arranged in the middle of the U shapes, jaw mechanisms are arranged on both ends of the U shapes, and opening and closing driving devices are respectively arranged on both sides of the U shapes; the workbench is arranged on the base; a guide rail and an in and out driving device are arranged below the workbench; roller frames are arranged on both ends above the workbench, and a linear guide rail is arranged below the workbench. The double-end jaw-type wheel pair withdrawal machine has the beneficial effects that the withdrawal is realized by clamping a wheel pair through jaws, so that the problem of an existing withdrawal machine that the withdrawal cannot be realized because the wheel pair is close to a case is solved; the structure is simple and reasonable, the handpieces are arranged obliquely, not only is the height of the whole machine reduced but also a work piece goes in and out conveniently, and is free from interference; the handpieces are fixed, and the rigidity strength is good; the double-end oil cylinders work, so that the machine withdraws without turning around, and the working efficiency is high.

The invention discloses a filtering element for filtering water in a nuclear reactor containment recirculation filter. The filtering element comprises a platy main body plate, wherein filtering holes are uniformly formed in the main body plate; a hollow rectangular structure is formed by bending the main body plate along the width direction; the two side edges of the bent main body plate are butted in a clamped manner. Furthermore, the invention further discloses a filtering unit with the filtering element and the nuclear reactor containment recirculation filter. The nuclear reactor containment recirculation filter is provided with a plurality of filtering elements and a plurality of filtering units with the filtering elements, so that the filtering area is greatly enlarged, and the confluence efficiency is greatly improved; under the working condition of a loss of coolant accident, filtering residues can be efficiently and quickly blocked so as to ensure that water collected in a reactor factory can be fully and efficiently filtered and prevent a nozzle on a spraying ring pipe of an EAS system from being blocked as well as prevent a fuel rod supporting barrier from being blocked in the recirculation stage of an RIS system.

The invention discloses a foldable luggage case which comprises a case body, wherein a driving device is arranged on the case body; an automatic following control system is arranged in the case body; the automatic following control system is electrically connected with the driving device; wheels are arranged at the bottom of the case body; the driving device is in driving connection with the wheels; a storage battery for supplying electric power to the whole system is also arranged in the case body; the case body comprises an outer-border pipe frame and a soft case surface layer, wherein the outer-border pipe frame can be connected in a folded mode, and the soft case surface layer is fixed on the outer-border pipe frame; the outer-border pipe frame comprises two rectangular frames and connecting rods, wherein the two rectangular frames are arranged in parallel, and the connecting rods are connected with four corners of the two rectangular frames; reinforcing rods are arranged on the two rectangular frames; the connecting rods are moveably connected with the two rectangular frames; and a supporting fixed component is arranged on the outer-border pipe frame. The foldable luggage case disclosed by the invention is high in rigidity when the foldable luggage case is unfolded and used; the foldable luggage case is high in collision and pressing resistance, is foldable and detachable, is convenient to store and occupies less space; electric driving is adopted and the foldable luggage case can automatically move following the user; and the foldable luggage case is free from dragging, is more labor-saving and is convenient for traveling.

The invention discloses a hoop device for oil pipelines, relates to the technical field of hoop hoops for oil pipelines, and is used to solve the problem that the stability of oil pipeline clamping cannot be guaranteed in the prior art; Two sets of arc-shaped mechanisms on the oil pipeline, and an adjustment assembly for adjusting and locking the distance between the two sets of arc-shaped mechanisms. Both sets of arc-shaped mechanisms include arc-shaped hoop plates and arc-shaped hoops for supporting The supporting components of the plate, the material of the arc-shaped hoop plate is NBR, and each set of support components is symmetrically arranged at both ends of the arc-shaped hoop plate and can support the radial adjustment of the arc-shaped hoop plate along the oil pipeline, and the arc-shaped hoop plate A hollow cavity filled with a low-melting-point metal alloy is arranged in the hoop plate, and a heater for heating the low-melting-point metal alloy is arranged in the hollow cavity. By implementing the technical solution, it can adapt to oil pipelines of different sizes to a large extent, and the stability of clamping the oil pipeline can be guaranteed through the ductility of the arc mechanism.

The invention relates to an efficient PCD-formed drilling reamer which comprises a reamer handle and a reamer head, wherein a cavity is formed in the reamer handle and the reamer head; a first pin rod and a second pin rod are arranged in the cavity; the reamer head comprises a primary reamer head and a secondary reamer head; a first reamer blade and a second reamer blade are arranged at the top of the primary reamer head; the first reamer blade is of a fan-shaped structure; a first PCD blade is arranged on one side of the first reamer blade; a first groove is formed between the other side of the first reamer blade and the primary reamer head; a third reamer blade and a fourth reamer blade are arranged at the top of the secondary reamer head; the edge of the third reamer blade is arc-shaped; a second PCD blade is arranged on one side of the third reamer blade; a second groove is formed between the other side of the third reamer blade and the secondary reamer head; and the second groove communicates with the first groove. The efficient PCD-formed drilling reamer provided by the invention is high in abrasion resistance and has the advantages that different sizes of steps in the same hole can be machined, the machining efficiency can be improved, and the service life can be prolonged.

The invention discloses a modular split assembled axial flow fan impeller and an assembling method thereof. The impeller comprises a mounting shaft sleeve, a hub, wheel discs and blades, wherein the hub is arranged in the middle of the mounting shaft sleeve in a sleeving mode, the wheel discs comprise a first wheel disc and a second wheel disc, the first wheel disc and the second wheel disc are respectively clamped at two sides of the mounting shaft sleeve and are connected to the hub, and the blades are clamped between the first wheel disc and the second wheel disc and are fixedly connected to the first wheel disc and the second wheel disc; and during assembly, firstly, the hub is clamped in the middle of the mounting shaft sleeve and fixed through bolts, the first wheel disc is clamped at one side of the mounting shaft sleeve and fixed to the hub through bolts, the blades are fixed to the first wheel disc, and then the second wheel disc is fixed to the hub and the blades; and the impeller is reasonable in structural design of the blades, high in assembling stability and reliability and suitable for large-scale popularization.