309 results about "Planishing" patented technology

The invention discloses a cutting-grinding dual-purpose rock-processing system with double end faces. The system consists of a base, a lift, a worktable, a cutting-grinding dual-purpose motor system and a fixture system, and is characterized in that the working height of the worktable is regulated through the lift, so that a cutter and a grinding stone on the cutting-grinding dual-purpose motor system can perform cutting and grinding operation when the worktable is at a cutting height and a grinding height respectively. The rock-processing system has the main advantage of realizing two functions of cutting and grinding rock samples on one instrument, along with simple principle, strong realizability, single machine with two functions, economical efficiency and practicability.

A welding Al-Cu alloy wire for MIG welding and AC TIG welding contains Cu (5.5-6.5 Wt%), Mn (0.2-0.6), Ti (0.15-0.30), Zr (0.15-0.35), V (0.05-0.20), Ag (0.2-0.5), Si (0-0.1), Fe (0-0.15) and Al (rest). Its preparing process includes such steps as smelting in graphite crucible, refining, removing slag, dehydrogenating, casting, soaking, removing scale, extruding, drawing and scraping. Its advantages are high strength, high plasticity and high cracking resistance.

The invention relates to laying equipment, in particular to petroleum asphalt coiled material laying equipment, and aims at achieving the technical purpose of providing the petroleum asphalt coiled material laying equipment which facilitates material putting, conducts laying smoothly, and is good in planishing effect. The petroleum asphalt coiled material laying equipment comprises a base plate and the like; wheels are arranged at the bottom of the base plate, lateral plates are arranged at both the left side and the right side of the top of the base plate, a top plate is arranged at the tops of the lateral plates, a first handle is arranged at the right side of the top plate, a material putting device is arranged at the left side of the top plate, and a transverse planishing device is arranged in the middle of the base plate. In the petroleum asphalt coiled material laying equipment, petroleum asphalt coiled materials are put to the ground through the material putting device, then the petroleum asphalt coiled material laying equipment is pushed leftwards, then the petroleum asphalt coiled materials are planished through the transverse planishing device and a longitudinal planishing device; meanwhile, a better laying effect is achieved by softening petroleum asphalt through a baking lamp.

The invention relates to a long-term preservation method for a well core, which mainly solves the problem of difficult preservation because a fractured and broken core taken out of a shaft bottom is difficult to cut or difficultly forms the entire plane after being cut. The method is characterized by comprising the following steps of: preparing a casting material; putting the core to be preserved into a U-shaped polyethylene support groove; slowly pouring the casting material into the U-shaped polyethylene support groove filled with the core; and sizing gel at room temperature, cutting the core after solidifying and sizing in a thermostatic drying oven, putting the core into a U-shaped transparent organic glass support groove for secondary casting and smoothing, grinding and polishing the surface of crystal gel in the U-shaped transparent organic glass support groove until the crystal gel is bright and transparent. By the method, the core can be integrally cut, a cut plane is smooth, the original core is preserved permanently and cannot be broken and the core is convenient to observe in all dimensions.

The invention discloses an intermediate layer assembly for connecting Si3N4 ceramic and stainless steel and a connecting method. The intermediate layer assembly is formed by sequentially jointing a Ti foil, an Ag-Cu solder foil, a Ni foil and an Ag-Cu solder foil. The connecting method comprises the following steps of: flattening, polishing and cleaning a Si3N4 ceramic test sample to be connected and the intermediate layer assembly; and tightly installing the Si3N4 ceramic, Ti, Ag-Cu, Ni, Ag-Cu and stainless steel in sequence, and welding in a vacuum furnace. The residual stress of the ceramic and the stainless steel joint can be relieved, the strength of the joint is improved, and the method is simple and convenient to implement.

The invention discloses an environment-friendly type bast fiber film preparation device, which comprises two feeding machines, a feed mixer, a crude opening machine, a fine opening machine, a vibrating air pressure bast feeding box, a carding machine, a mechanical cross lapper, an air-lay machine, an impregnator, a drying can type pre-drying pit, an air-pressure double-roller planishing mill, a surface spraying coating machine, a drying can type dying setting machine, a drafting side cut lap former and the other operation unit machines. Each unit-air conditioning adopts variable-frequency control and a synchronizer to control electric appliances, and each unit-air conditioning can be singly operated in high speed, and can be interlocked to operate with complete equipment. The invention has the advantages that fibrilia is delivered by an airflow pipeline on the crude opening machine, and between the crude opening machine and the carding machine, and the supply of raw material is continuous, net is combined in two times through a machine to pave net and airflow to form net, bast fiber film net has little density, even strength and stable quality, even coating layers are coated and sprayed on double faces of bast fiber film, and bast fiber film with different functions and usages can be made, continuous and stable full-automatic production of bast fiber film can be achieved.

The invention belongs to the filed of cleaning and leveling of strip steel, in particular to a non-contact roll cleaning method for a dry planishing mill. The non-contact roll cleaning method for the dry planishing mill is characterized in that: 1) a first dust suction hood and a second dust suction hood are arranged on a roll gap of an upper working roll and a lower working roll on the outlet side of the dry planishing mill in the flying direction of metallic dust, and suck away the metallic dust, wherein the first dust suction hood is positioned above a strip steel passing line, and the second dust suction hood is positioned below the strip steel passing line; and 2) a third dust suction hood is arranged on a roll gap of the upper working roll and an upper intermediate roll on the inlet side of the dry planishing mill in the flying direction of the metallic dust, and suck away the metallic dust; and a fourth dust suction hood is arranged on a roll gap of the lower working roll and a lower intermediate roll on the inlet side of the dry planishing mill in the flying direction of the metallic dust, and suck away the metallic dust. The method can improve the surface quality of strip steel and cleaning of the rolls and avoid surface damage to the rolls.

The invention discloses a making and construction method of a chlorination furnace. The making and construction method comprises the following steps of carrying out processing and blanking in a factory, carrying out installation on a construction site, carrying out integral heat treatment, carrying out a hydraulic pressure test and an air-tight test, and carrying out equipment painting. The chlorination furnace comprises an upper head, an upper cylindrical shell, a lower cylindrical shell and an outer jacket. The upper head is arranged on the upper cylindrical shell. The upper cylindrical shell is arranged on the lower cylindrical shell. The outer jacket surrounds the lower cylindrical shell. Support annular plates are welded on the upper cylindrical shell. Multiple support rib plates and water holes are arranged on the support annular plate at equal intervals. The support rib plate is provided with a water groove. The upper head is provided with four water outlet weir plates. The water outlet weir plates are provided with concave-convex teeth and water holes. A lower part of the lower cylindrical shell is provided with a lower head. The wall plate groove of 50mm is made by butt joint of steel plates having different thickness, and then is processed. In construction, the groove is manufactured by flame machining and is rubbed flat by a grinding machine so that the construction period is reduced and grinding wheel sheet consumption is greatly reduced and manpower is saved.

The present invention discloses a forming method of liquid storage cylinder made of steel which is used in the refrigeration equipment, and is characterized by that it selects ST14 cold-drawn steel pipe as raw material, and its forming method includes the following steps: preparing raw material, cutting said ST14 cold-drawn steel pipe and stretch planishing by rotary extrusion machine tool so as to obtain the invented product without welded seam.

The invention discloses a machining process of a propeller shell, comprising the following steps of: A, taking a steel plate and cutting the steel plate by a straight-line cutter or a cutting machine, so as to guarantee that the error degree of the cut steel plate is less than 2 mm; B, rolling the cut steel plate by using a rolling machine; C, butting and welding two ends of the rolled steel plate to form a cylinder, and carrying out nondestructive testing on a welding part; D, grinding a welding seam by using a grinding machine; and E, pressing and molding the grinded cylinder by using a mould to prepare the propeller shell. The machining process of the propeller shell has the advantages of improving the working efficiency and further improving the quality of products.

The invention discloses a method for manufacturing low-carbon resisto seamless stainless steel tubes. The method is used for manufacturing all-austenitic low-carbon resisto seamless stainless steel tubes, and includes steps of (1) checking a blank at first; (2) pickling the checked blank; (3) realizing polishing, opening trimming, cold rolling and oil removal for the pickled blank; (4) judging whether the blank meets requirements of a finished product or not, and performing finished product solid solution thermal treatment, straightening, finished product fixed-length cutting and finished product pickling if the blank meets the requirements of the finished product; (5) performing intermediate product solid solution thermal treatment, straightening, fixed-length cutting, and pickling and repeating the step (3) if the blank does not meet the requirements of the finished product; and (6) finally checking, spray-marking, packaging and weighing the finished product and then delivering the finished product out of a warehouse. By the aid of the method, corrosion resistance of the surfaces of the seamless steel tubes is increased, performance standard is improved, manufacturing cost is reduced, and a work procedure is simple.

The invention provides a surface machining device and method aiming at bending metal pipes of small specifications and relates to the field of metal pipes. The surface machining device aiming at bending the metal pipes of the small specifications is used for bending pipe bodies and comprises a working table, a placing groove, a bending mechanism, a supporting rod, a cable and multiple polishing mechanisms. The placing groove is formed in the working table. The bending mechanism is arranged on one side of the placing groove. According to the surface machining device aiming at bending the metalpipes of the small specifications, by means of cooperation of the cable, a fixing sleeve, a tiny electric pushing rod and a scraper, the whole polishing mechanism extends into the metal pipes to be bent. The function of filler is achieved, and the interiors can be stressed uniformly when the pipes are bent. After the pipes are bent, the cable is pulled to drive the scraper on the polishing mechanism to move while the scraper makes contact with pipe walls. Thus wrinkles generated on the inner walls of bent portions of the pipes are milled flatly, the effect of polishing the inner walls of the metal pipes of the small specifications is achieved, and the situation that due to existence of the wrinkles, the use effect of the pipes is influenced.

The invention relates to the technical field of metallographic phase preparation, and in particular relates to a method for displaying and treating Cr12 type martensitic heat-resistant steel primary austenite grain boundary by high-temperature oxidation and room temperature erosion. The method comprises four steps of preparing a polished sample, carrying out heat treatment, finely grinding and polishing, and etching. The method concretely comprises the steps of: firstly, preparing the sample, and grinding one of the planes of the sample to be smooth; then, putting the sample into a heating furnace, carrying out heat preservation under the condition of the temperature and time parameters to be researched, and quenching after heat preservation; carrying out water milling on the sample, keeping a certain angle between the polished surface and abrasive paper during water milling, guaranteeing that the surface of the sample is provided with a matrix-oxidation zone transition area, polishing, etching by an erosion reagent, cleaning by alcohol and then blowing the product to be dry; and observing the clear primary austenite grain boundary under a microscope. According to the technical scheme of the method, the implementation is simple and convenient; and after the technical scheme is implemented, the material primary austenite grain boundary is not influenced by a matrix metallographic structure simultaneously when being clearly and integrally displayed.

The invention discloses a production and machining method for a bed knife of a lawn mower, and belongs to the field of garden machines. The method comprises the following steps of: (1) making a blanking die, a punching die and a press molding die; (2) performing tempering for 2 hours at 445 to 455 DEG C; (3) performing secondary tempering for 2 to 3 hours; (4) performing tertiary tempering for 2 to 3 hours; (5) performing linear cutting machining and machining center machining on the dies, and after the dies are machined, pressing a blank to obtain a rough blank, wherein the blank is made from 65Mn spring steel; (6) reaming a counter bored hole; (7) performing reshaping by using a press; (8) grinding the rough blank by using a grinder; (9) heating the rough blank obtained by the step (8) at 760 to 800 DEG C by using a mesh belt furnace, wherein the transmission speed of a mesh belt is 4 to 6cm / s; (10) performing tempering for 3 hours at 375 to 385 DEG C; and (11) after the rough blank is cooled and reshaped by the press, performing blackening treatment, and grinding a plain end and a standing opening. According to the method, the production efficiency and the quality of a product are greatly improved under the conditions of the conventional product equipment, manpower and material resources, the time of delivery is shortened, and the competitiveness of the product is improved.

The invention discloses a panel stamping and bending process of a control cabinet. The panel stamping and bending process comprises the following steps of: regulating a gap between an upper blade and a lower blade of a plate shearing machine according to the quality and the thickness of a plate material; cutting and blanking according to the length and the width of the designed plate material; programming according to an unfolded picture of an appearance of a product, drawing the unfolded picture of the appearance of the product and determining selected moulds by adopting a numerically controlled turret punch press; stamping according to the thickness, the quality and the length of the plate material; bending the plate material by a bending machine, selecting a crank arm type convex mould, enabling a sliding block to drive a clamping block and the sliding block to move longitudinally due to the connection of the clamping block and the sliding block so as to realize the bending movement of an upper mould; regulating the clamping block through a regulating mould to regulate a horizontal position of a lower mould and ensure that the lower mould and the upper mould are parallel; and correcting by a hammer planishing method. The principle of hammering parts of the plate material comprises the following steps of: hammering the circumference of the plate material if the middle part of the plate material is wrinkled, and hammering the middle part of the plate material if the circumference of the plate material is wrinkled. The invention has the advantages of mainly reducing a lineation working procedure and the labor strength, and also has the certain realistic significance to guide the enterprise production.

The invention belongs to the technical field of welding, and particularly relates to a horizontal pipe welding machine capable of automatically grinding weld joints. The top of a machine frame is rotationally connected with a supporting wheel through a support, a first support is fixedly connected to the portion, at one side of the supporting wheel, of the machine in a rising manner, a driving motor is fixedly connected to the top of the first support, and a vertically-arranged driving wheel is fixedly connected to an output shaft of the driving motor; a transverse rod is fixedly connected tothe portion, between the first support and the supporting wheel, of the machine frame through a vertical rod, the two ends of the transverse rod are rotationally connected with a pair of tensioning wheels, the tensioning wheels are driven by hub motors arranged in the tensioning wheels to rotate, and an annular abrasive belt sleeves between the tensioning wheels; a cleaning roller is rotationallyconnected to the side, away from the motor, of the vertical rod through a third support, a plurality of rows of bristles made of steel wires are evenly distributed on the periphery of the cleaning roller, and the cleaning roller is driven by the motor to rotate; and the side, away from the tensioning wheels, of the third support is fixedly connected with a welding gun through the support. According to the horizontal pipe welding machine, welding scale is brushed away through the bristles, so that abrasion of the abrasive belt is reduced, and the welding and grinding efficiency of the pipe welding machine on a pipeline is improved.

The invention discloses a processing method for effectively reducing the anisotropy of a cold-rolled titanium tape, which comprises the following steps: carrying out complete recrystallization annealing on a GR1 or GR2 cold-rolled titanium tape which is cold-rolled to a target thickness or close to the target thickness, wherein the crystalline grain diameters of different parts of the titanium tape subjected to annealing are sequentially controlled at 40-65 mu m in the GR1 cold-rolled titanium tape and 10-20 mu m in the GR2 cold-rolled titanium tape; and feeding the cold-rolled titanium tape into a common cold-rolling mill, and under the conditions that the rolling speed is 15-50 m / min, the uncoiling unit tension is 2-10 kg / mm<2>, and the winding unit tension is 3-15 kg / mm<2>, in a constant rolling force control mode, carrying out dry planishing on the pure titanium tape directly by using a working roll on the common cold-rolling mill, and controlling the rolling reduction. According to the invention, the anisotropy of the cold-rolled titanium tape is obviously reduced, the difference between transverse and longitudinal yielding-to-tensile ratios of the GR1 cold-rolled titanium tape is reduced from 26.8% to 11.1%, and the difference between transverse and longitudinal yielding-to-tensile ratios of the GR2 cold-rolled titanium tape is reduced from 16.2% to 3.8%; and in addition, the evenness of a titanium plate subjected to planishing is significantly increased in comparison with that before annealing, and the unevenness can be up to 3 mm / m, therefore, the titanium plate is good in processing formability.

The invention discloses an environment-friendly wall surface grinding device for building construction and a building construction method, and relates to the field of wall surface grinding devices for building construction. The environment-friendly wall surface grinding device comprises a base, a supporting column is fixedly arranged at the top of the base, a telescopic groove is formed in the top of the supporting column, and a telescopic column capable of moving up and down is movably installed in the telescopic groove. The invention further discloses an environment-friendly wall surface grinding method for building construction. The height of the device is adjusted, so that the device can be used for polishing wall surfaces with different heights, other tools are not needed any more, polishing is facilitated for workers, meanwhile, the polishing angle of the device can be adjusted, the device can be used for polishing the wall surfaces with different inclined planes, and the practicability of the device is improved; and when the wall surface is ground, dust generated when the wall surface is ground can be sucked into a dust collecting box, so that the dust can be effectively prevented from drifting away, and the body health of workers is guaranteed.

A metal leadframe strip (500) for semiconductor devices is described. The leadframe strip has a plurality of sites (510) for assembling semiconductor chips. The sites alternate with zones (520) for connecting the leadframe to molding compound runners. The sites (510) have mechanically rough and optically matte surfaces (511, 512). The zones (520) have at least portions with mechanically flattened and optically shiny metal surfaces (521, 522). The flattened surface portions transition into the rough surface portions by a step.

The invention discloses an automatic flush polishing machining device for a plate. Due to sliding of an electric cylinder sliding block, the plate is driven to move in the direction of a linear electric cylinder guide rail, when the plate is moved to the bottom end of a second drive mechanism, the second drive mechanism and a flush polishing mechanism are driven, and the plate can be polished in the direction of a first sliding way. After polishing, the electric cylinder sliding block continuously drives the plate on a bottom plate to move in the direction of the linear electric cylinder guiderail, when the plate is moved to the bottom of a third driving mechanism, the third driving mechanism and the flush polishing mechanism are driven, the plate can be polished in the direction of a second sliding way, repeated and multi-time polishing of the plate can be achieved in the transverse direction and the vertical direction, the flush polishing efficiency is high, the flush polishing effect is good, high-efficiency work is completed under the limited cost, and the device is suitable for real production; and meanwhile, a clamping mechanism is designed in the device, a handle is rotatedso as to drive a screw rod to be fed to conduct clamping and fixing on the plate arranged between second supporting plates, position deflection caused during flush polishing is prevented, and the machining quality is ensured to a certain degree.

A method for fabricating a leadframe strip is disclosed. A leadframe pattern is formed from flat sheet of base metal. Additional metal layers are plated on patterned tape of base metal and the leadframe surface is roughed. A first set of leadframe areas is planished. A second set of leadframe areas are offsetted and the tape is cut into strips.

The invention discloses a repairing device capable of detecting the steel flatness. The device comprises a main machine body, wherein a detection machining cavity is formed in the main machine body; amachining mechanism capable of perform polishing machining on the four planes of the periphery of steel is arranged inside the detection machining cavity; and the machining mechanism comprises a supporting body fixedly arranged between the upper wall and the lower wall of the detection machining cavity. The flatness of the steel can be automatically detected through a detection mechanism, so thatlabors are saved; when the flatness of the steel is detected to be unqualified, the rotation of a motor can drive the machining mechanism to polish the planes of the steel; the steel plane repairingefficiency is improved through the connection of detection and polishing machining; and then the motor is operated to conduct repeated detection until the four planes of the periphery of the steel aremachined to meet the flatness qualification requirement, and the steel production quality is improved.

The invention discloses a repairing technique for a vertical reducer body. The repairing technique includes the following requirements: (1) surface treatment: <1> clearing old paint to expose a reducer body, removing an original welding blocking by a flat shovel, and machining a crack into a 45-degree V-shaped groove by a grinding wheel; and <2> rust and stain clearing, performing washing with gasoline, and then performing wiping with acetone for 3-5 times, and drying in air; (2) sticking technique: <1> hole repairing, pasting 3 layers of glass cloth to the inner side of a hole with a repairing agent, wherein the diameter of the first layer of the glass cloth is 4-5 cm greater than that of the hole, and the second layer and the third layer of the glass cloth are 4-5 cm greater than the previous layer respectively; and <2> crack repairing, filling the repairing agent in the V-shaped groove of the crack, performing curing at the indoor temperature for 24 hours, performing leveling through filing, then pasting three layers of glass cloth to the inner side and the outer side with the repairing agent, and performing ground flush after 12 hours. The repairing technique is reasonable in processes, is low in cost, is reasonable and coordinated in parameter collocation, is short in time, and is simple in operation.

The invention relates to a composite machining method for multi-layer solid wood composite board manufacturing. A composite machining device for multi-layer solid wood composite board manufacturing is used in the method and comprises a mounting frame, supporting legs, a pushing mechanism, a conveying mechanism, a grinding mechanism and a material returning frame. According to the method, the problems that in the composite machining process for multi-layer solid wood composite board manufacturing, it is difficult to avoid bonding interference among solid wood composite boards in a traditional stacking mode, it is difficult to push out and convey the stacked solid wood composite boards one by one, the workload of manual taking is increased, it is difficult to support and limit the solid wood composite boards in multiple directions, the horizontal centering degree of the solid wood composite boards is reduced, the side walls of the solid wood boards are easily scratched, it is difficult to perform circumferential glue removal operation on the peripheries of the solid wood composite boards, the operation efficiency of the glue removal operation is reduced, it is difficult to collect falling dust in time and the like are solved.

The invention relates to a hydraulic splitting test device for simulating concrete components under different stress conditions, and relates to the technical field of hydraulic splitting test devices for concrete components. The invention comprises a cuboid mold with an opening on one side. Concrete is poured into the mold to obtain a concrete component. Eight high-pressure resistant water bends are preset in the concrete component, and a water pressure sensor joint is arranged at the end of each high-pressure resistant water bend; the steel is pulled out from the concrete component. The initial cracks are prefabricated on the sheet, and a certain range of grooves are ground around the cracks, strain gauges and clip-type extensometers are arranged, filled and ground with water-proof insulating glue; water-sealed steel plates are arranged on the components, and water inlets and belt Seal the exhaust port of the cap. Based on the invention, the hydraulic splitting test research of the concrete structure under the combined working conditions of different stress conditions and different initial crack inclination angle conditions can be carried out.

The invention discloses a uniform grinding device for metal coloring treatment. The uniform grinding device comprises a supporting plate, a moving mechanism, a clamping mechanism and a grinding mechanism, wherein the moving mechanism is mounted at the top of the supporting plate, and the moving mechanism is used for supporting and moving a metal part for grinding. When the uniform grinding device for metal coloring treatment is used, a to-be-ground metal part is placed on a movable plate, two first connecting plates are made to squeeze the metal part by rotating a rod body in the clamping mechanism so as to clamp and fix the metal part, so that the metal part is more stable during subsequent grinding operation; and after the metal part is fixed, the movable plate is moved, when the movable plate slides, a motor is started to drive a grinding roller to operate, an air cylinder pushes a fixing plate to drive sliding blocks to move up and down in first sliding grooves, and therefore the uniform grinding device for metal coloring treatment can be adapted to the metal parts of different heights; and the surfaces of the metal parts are ground more evenly through the grinding roller of a long-barrel-shaped structure, and later coloring of metal is facilitated.

The invention relates to the technical field of papermaking, in particular to a papermaking wear-resistant rubber roller, which comprises a rotary drum, a driving mechanism is arranged in the rotary drum, a springback mechanism is arranged on the inner wall of one side of the rotary drum, a fixing piece is driven by an arranged rotary rod to rotate, and a threaded rod is driven by the fixing pieceto rotate. When the threaded rod rotates, the threads on the surface extrude the threads on the inner wall of the threaded ring, then the threaded rod rotates and moves towards the interior of the circular groove, the conical surface on the threaded rod extrudes the inclined surfaces of the surfaces of the pushing blocks, then the two pushing blocks move towards the two sides, the two pushing blocks push the two pressing plates to move, and the pressing plates drive the rubber roller to move towards the interior of the trapezoidal hole. The rubber roller extends out of the cylinder from the through hole and the extending rubber roller rubs paper on the surface of the rotary drum to drive the paper to move; after the extending rubber roller is rubbed down, the threaded rod is rotated to push the rubber roller to extend out of one part again, so that the rubber roller does not need to be replaced frequently, thus preventing waste.

The invention discloses a jacket heat exchanger straight pipe inner pipe deep hole welding assembly device used for assembly between jacket heat exchanger straight pipe inner pipes. The assembly device is symmetrically arranged with respect to the center line of a pipe shaft. The assembly device comprises a guide pipe, a cone shaft connected with the guide pipe and a sleeve matched with the cone shaft in taper. The assembly device stretches into the jacket heat exchanger straight pipe inner pipes. Under the action of external force, the sleeve is pushed into a seam of the two adjacent inner pipes through the cone shaft and meanwhile expanded so as to straighten the two adjacent inner pipes, and the outer surface of the sleeve can be closely attached to the inner walls of the two adjacent inner pipes. According to a jacket heat exchanger, the straight pipe inner pipes of the jacket heat exchanger are assembled, welded and connected through the assembly device. Compared with the prior art, the problems that due to the too small inner diameter of a pipe fitting, assembly is difficult, the pipe inner surface weld reinforcement cannot be ground flat after assembly, the labor intensity of inner seam grinding is large, efficiency is low, and the grinding quality is not stable can be effectively solved. Meanwhile, the jacket heat exchanger straight pipe inner pipe deep hole welding assembly device and the jacket heat exchanger have the beneficial effects that the structure is simple, operation is easy and convenient, positioning precision is high, and repeated usage can be achieved.

The invention discloses an electric-arc scale-welding fine welding device for a steel tube. The electric-arc scale-welding fine welding device is characterized by structurally comprising an external framework, a control display screen and the like. The electric-arc scale-welding fine welding device has the beneficial effects that: in order to solve the problems that scale-welding is mostly accomplished manually as a metal oxide exists on the surface of the original welding seam, welding seam loading is difficult, a welding finished product welding seam is not flat, and a manual operation errorrate is high while the electric-arc scale-welding fine welding device for the steel tube in the prior art is used, a welding seam outer surface processing mechanism, a scale-welding welding line done-welding mechanism, a steel tube clamping retarding mechanism and a scale-welding welding tank forming mechanism are designed; in use, the welding seam outer surface processing mechanism performs oxide-removal grinding treatment on the surface of the welding seam, and is matched with the scale-welding welding tank forming mechanism to define a welding tank; and finally, the steel tube clamping retarding mechanism is matched with the scale-welding welding line done-welding mechanism to accomplish scale-welding fine welding treatment, so that welding seam oxides are cleared, the welding seam isgrinded flatly, mechanical automatic scale-welding welding line operation is precisely positioned, and the pre-loading effect of a welding flux tank is achieved.