83results about How to "Increase wall thickness" patented technology

The invention discloses a thin-wall three-period minimal curved surface lattice structure laser additive manufacturing method, which relates to the field of additive manufacturing, and comprises the following steps: (1) according to a three-period minimal curved surface implicit function and additive manufacturing layer thickness, obtaining a single-channel contour path of each layer through direct slicing; (2) generating parallel filling lines in each layer, and intersecting the parallel filling lines with the combination of the contour paths of the layer and the higher layer; (3) combining every two intersection points to form a line segment, and taking the line segment as a filling path if sampling points of the line segment meet the conditions of a functional expression, an inclination angle and a length; (4) taking the filling path of the layer as a supporting layer, and moving the filling path upwards by one layer to form a filling layer; and (5) all the paths are input into additive manufacturing equipment, and different machining parameters are set for manufacturing. The laser path of the thin-wall three-period minimal curved surface lattice structure can be efficiently generated, only one melting channel is contained in the thickness direction of the structure, the wall thickness is smaller than 200 micrometers, and the cavity defect generated in the slicing process can be overcome.

The invention discloses a hoop and a forming method thereof, the hoop comprises a hoop belt with an elastic part, a first mounting part and a second mounting part, the first mounting part and the second mounting part are detachably connected through a connecting piece, and the elastic part, the first mounting part and the second mounting part are integrally formed by paving continuous long fibers and resin materials; the thickness of the large deformation area of the elastic part is smaller than that of the small deformation area and / or the large deformation area is provided with an annular groove. The invention provides a high-performance light-weight long-fiber clamp which is used for fixing aviation cables and pipelines, the clamp can independently adopt a strap and can also be used in cooperation with a rubber pad, the strap adopts a long-fiber composite material strap to replace a metal clamp strap, the product weight is reduced, the size is reduced, and the structural strength is guaranteed; by adopting the modes of reducing structural design, combination of continuous long fibers and resin materials and the like, the toughness of the strap is improved, the deformation elastic force is reduced, the hoop can be manually opened, and the problems of brittle failure and the like of the carbon fiber strap are avoided.

The utility model discloses a core pipeline for a middle-deep geothermal well, and belongs to the technical field of geothermal well pipelines. The pipeline adopts a segmented assembly structure and comprises a high-temperature section pipeline with the applicable temperature higher than 100 DEG C, a medium-temperature section pipeline with the applicable temperature ranging from 40 DEG C to 80 DEG C and a low-temperature section pipeline with the applicable temperature lower than 40 DEG C, and the pipelines are sequentially arranged and fixedly connected through connecting sections to form a complete assembly pipeline; and the lengths of the high-temperature section pipeline, the medium-temperature section pipeline and the low-temperature section pipeline correspond to the depths of all temperature sections in the geothermal well. The pipeline adopts a segmented assembly structure, the high-temperature section adopts the high-temperature-resistant pipe, and the wall thickness of the pipe is small, so that heat exchange between water and high-temperature geology can be enhanced, and the temperature of the water is increased; the medium-temperature section is large in wall thickness and high in strength, and can be used for a long time in the temperature section; the medium-temperature section pipeline is made of a heat-insulating pipe which is large in wall thickness and high in strength; the low-temperature section is large in wall thickness, high in strength and good in heat preservation effect.

The invention discloses an electronic expansion valve and an air conditioning system, and relates to the technical field of electronic expansion valves.The electronic expansion valve comprises a first valve needle and a valve port assembly, the valve port assembly comprises a connecting base, a valve port ring and a pressing sleeve, the connecting base comprises a limiting part, a connecting part located below the limiting part and a hollow inner cavity, and the valve port ring is arranged in the inner cavity; the valve port ring is arranged in the inner cavity and abuts against the limiting part, the pressing sleeve is connected with the connecting part, the valve port ring and the limiting part axially press the valve port ring, the valve port ring is provided with a valve port communicated with the inner cavity, the first valve needle is movably arranged on the connecting base, and the second valve needle is movably arranged on the connecting base. And a flow path through which the connecting seat is communicated with the valve port is opened and closed. The technical scheme provided by the invention aims to solve the problems of separation and internal leakage of the sealing ring caused by insufficient limiting of the sealing ring by a valve port piece under the condition of a large-diameter valve port of the electronic expansion valve.

The utility model discloses a thermal power plant air preheater with nickel titanium alloy function coating belongs to air preheater technical field, a thermal power plant air preheater with nickel titanium alloy function coating includes the shell, a layer nickel titanium alloy function coating covers the shell outside, the heat exchange subassembly is rotationally arranged in the shell, the shell upper and lower sides are provided with the air inlet, the air outlet, the smoke outlet and the smoke inlet respectively with heat exchange subassembly intercommunication, this technical scheme can set up nickel titanium alloy function coating, can prevent the wall thickness thinning of air preheater because of abrasion, reduce the air preheater's air leakage rate, improve equipment overall integrity, and then reduce the maintenance use cost, can reduce the environmental pollution caused by the abrasion problem of air preheater simultaneously.

The present invention discloses a peep piece module and a video laryngoscope peep piece, comprising an arc-shaped pipe fitting and a tongue depressor, wherein the arc-shaped pipe fitting and the tongue depressor are integrally formed and the tongue depressor is connected to the arc-shaped pipe fitting, the distal end of the arc-shaped pipe fitting is an arc-shaped pipe head, the proximal end of the arc-shaped pipe fitting is an arc-shaped pipe tail, the distal end of the tongue depressor is a tongue depressor, the proximal end of the tongue depressor is a tongue tail, the arc-shaped pipe fitting comprises a first pipe wall located on the outside, a second pipe wall located on the inside, a first pipe side wall located on the front side and connected to the first pipe wall and the second pipe wall, and a second pipe side wall located on the rear side and connected to the first pipe wall and the second pipe wall, wherein the first pipe wall, the second pipe wall, the first pipe side wall and the second pipe side wall are enclosed into an arc-shaped tube cavity. The present invention has the advantages of high strength, high precision, convenient intubation, convenient positioning of camera components, high imaging quality, and can prevent halo or reflection.

The inner wall cleaning structure of the pharmaceutical barrel comprises a hollow column, a valve is installed on the outer surface of the upper end of the hollow column, the valve is connected with a connecting pipe through a high-pressure hose, and a hollow disc used for being installed at the movable end of an electric push rod is installed at the open end of the connecting pipe. A plurality of vertical holes penetrating through the hollow disc are annularly formed in the edge of the upper surface of the hollow disc at equal intervals, straight pipes are inserted into the vertical holes, a plurality of small holes are formed in the outer surfaces of the straight pipes, rectangular pipes are arranged on the upper sides of the vertical holes, pistons are installed at the upper ends of the straight pipes, and the pistons are installed in the rectangular pipes in a sliding mode. A piston is installed on the upper surface of the straight pipe, a U-shaped plate is installed on the upper surface of the piston, the U-shaped plate is clamped on the rectangular pipe, and the end, away from the piston, of the U-shaped plate is in threaded connection with a positioning screw used for limiting the relative position of the U-shaped plate and the rectangular pipe. The application range is expanded.

The utility model discloses a hollow type hydraulic motor drive shaft, including drive shaft body, drive shaft body includes input and output, is equipped with the second spline on the output, and the one end of input is away from the output and is equipped with the first spline, and the inside drive shaft is equipped with the stepped through -hole along the axial direction, and the through -hole includes first aperture section, second aperture section and transition section, and first aperture section is located at the input, and second aperture section is located at the output, and the diameter of first aperture section is less than the diameter of second aperture section, and transition section links first aperture section and second aperture section, and the oil circuit through -hole is set up on the output, and one end of oil circuit through -hole is communicated with transition section, the utility model discloses reasonable in structure, and the diameter of first aperture section is smaller, can strengthen the intensity of input, and the diameter of second aperture section is larger, and the external executing mechanism is convenient for connecting, and finally uses transition section to link two aperture sections, and balances the pressure difference to a certain extent through oil circuit through -hole, and strengthens the overall strength of drive shaft.

The application discloses a cylinder-wall-oil-through anti-rotation multi-stage hydraulic oil cylinder and relates to the technical field of hydraulic oil cylinders. The cylinder-wall-oil-through anti-rotation multi-stage hydraulic oil cylinder comprises a cylinder body, a cylinder barrel, a piston rod, a cylinder bottom cover, a primary guide sleeve, a secondary piston, a secondary guide sleeve and an inner piston, the cylinder body is provided with a first piston cavity, the cylinder barrel is provided with a secondary piston cavity, at least one cylinder barrel is sequentially sleeved in the cylinder body, the piston rod is sleeved in the innermost cylinder barrel, the axis of the first piston cavity is parallel to the axis of the cylinder body, the axis of the secondary piston cavity is parallel to the axis of the cylinder barrel where the secondary piston cavity is arranged, the axis of the secondary piston is parallel to the axis of the cylinder barrel connected with the secondary piston, and the axis of the inner piston is parallel to the axis of the piston rod connected with the inner piston. The cylinder-wall-oil-through anti-rotation multi-stage hydraulic oil cylinder realizes reliable anti-rotation of the multi-stage oil cylinder, increases the oil cylinder stroke, is convenient to process and install, has strong universality and is suitable for hydraulic operation scenes, such as a gallery drilling machine, that need to be prevented from rotating.

The utility model provides a bearing device facilitating assembly of a glass fiber reinforced plastic inner cylinder and a chimney, and belongs to the technical field of steel chimneys. According to the technical scheme, the reinforcing structure is characterized by comprising a supporting structure fixed to the inner wall of a steel outer cylinder, a bearing ring structure fixed to the outer wall of a glass fiber reinforced plastic inner cylinder and erected on the supporting structure, and a reinforcing boss fixed to the outer wall of the glass fiber reinforced plastic inner cylinder and located above the bearing ring structure; the glass fiber reinforced plastic inner cylinder has the technical effects that the glass fiber reinforced plastic inner cylinder can be pushed into the steel outer cylinder during assembly, the bearing ring structure is erected on the supporting structure and is attached to the supporting structure, the supporting structure plays a role in bearing, and the glass fiber reinforced plastic inner cylinder is hung in the steel outer cylinder through the bearing ring structure and the supporting structure; the assembly difficulty of the sleeve chimney adopting the glass fiber reinforced plastic inner cylinder is reduced; the load of the glass fiber reinforced plastic inner cylinder is transmitted to the steel outer cylinder through the supporting structure, and the overall stability of the chimney is improved.

The invention provides an offshore wind power pile foundation design method considering a pile sinking effect and soil response, and relates to the technical field of offshore wind power engineering.The method comprises the steps that the marine environment of a target sea area, a fan structure and initial pile foundation design parameters are obtained; pile sinking disturbance factors are calculated based on the parameters, and then actual mechanical parameter distribution of the soil body after pile sinking is determined; calculating a coupling response coefficient based on the distribution, and correcting a pile-soil interaction model according to the coupling response coefficient; carrying out dynamic response analysis on the pile foundation under long-term cyclic loading by utilizing the corrected model, and calculating the displacement, the internal force and the accumulated rotating angle of the pile foundation; and comparing and checking a calculation result with a design allowable value, and obtaining a final design scheme through iterative optimization. According to the method, coupling analysis of the pile sinking effect and the power response in the service period is achieved, and the safety and economical efficiency of design are improved.

The utility model discloses a motor base with a cooling function, which relates to the technical field of motors and comprises a base outer sleeve, a base inner sleeve, a stator core, a water inlet seat and a water outlet seat. And the wall thickness of the base outer sleeve is properly increased to strengthen the function of the base outer sleeve serving as an effective support body of the motor, so that the base inner sleeve only plays a role in sealing a cooling medium in the spiral groove, and the base outer sleeve has a core supporting task and does not need to be subjected to complex spiral water groove processing treatment, so that the cost is reduced. Therefore, the wall thickness of the inner sleeve of the base can be 2-5mm, and the reduction of the wall thickness of the inner sleeve further shortens the distance between the cooling medium and the stator iron core, thereby greatly improving the conduction efficiency of the cooling medium to the heat in the stator iron core, and remarkably optimizing the overall heat dissipation effect.

The utility model discloses a high -strength tee bend pipe fitting relates to tee bend pipe fitting technical field, this high -strength tee bend pipe fitting, including the main pipe body and the pipe body of the perpendicular main pipe body axis setting, the pipe body and the main pipe body's junction area are equipped with the composite reinforcing rib, the pipe body middle wall thickness is greater than two end wall thickness, the main pipe body junction area wall thickness is greater than end wall thickness, the composite reinforcing rib includes radial reinforcing rib, axial reinforcing rib and transition reinforcing rib, the inner wall middle part of pipe body is equipped with the flow guide block in the position department of main pipe body, the utility model discloses a composite reinforcing structure is set up in the junction area of stress concentration, and the junction area wall thickness increases, and the flow guide block divides main pipe body fluid, and acts as internal support structure and external composite reinforcing rib together, forms the composite strengthening system of inside supporting outside hoop, and the anti -deformation ability and fatigue life of pipe fitting under high pressure working condition are improved significantly.

The invention discloses a detachable structure and method for a thermocouple at the bottom of a substrate glass kiln, and the structure comprises a platinum alloy sleeve which is used for being inserted into a thermocouple hole; the supporting steel beam is positioned below the thermocouple hole and axially coincides with the thermocouple hole; the insulating plate is of a hollow structure, arranged at the top of the supporting steel beam and communicated with the supporting steel beam; the end part of the precious metal thermocouple penetrates through the supporting steel beam and the insulating plate in sequence and extends into the platinum alloy sleeve; and the positioning assemblies are mounted on two opposite sides of the insulating plate, and the end parts of the positioning assemblies extend into the insulating plate and abut against the outer side of the precious metal thermocouple to position the precious metal thermocouple. The sleeve made of platinum alloy is used as a protective layer of the precious metal thermocouple, so that the impact force of molten glass and the corrosion of gas in a kiln can be effectively reduced, and the precious metal thermocouple can normally and reliably perform temperature measurement operation.

An internal combustion engine is provided, which has a common engine transmission housing, the engine transmission housing having a crankcase chamber and a transmission chamber accommodating a shift transmission, wherein a crankshaft having a longitudinal center axis can be rotatably accommodated in the crankcase chamber, and the internal combustion engine has a longitudinal axis and a vertical axis extending transversely to the longitudinal center axis of the crankshaft, and has at least one working cylinder with a piston working surface and a working piston that can move along the piston working surface in the working cylinder, the working piston is connected to the crankshaft through a connecting rod, and the engine transmission housing has a clutch accommodating chamber in which a clutch device is arranged and a rotor accommodating chamber in which a generator device is arranged, the working piston has a piston head, the piston head has a top surface facing the combustion chamber and a bottom surface facing the crankcase chamber, and the internal combustion engine has an intake valve and an exhaust valve, the intake valve and the exhaust valve face the combustion chamber and are arranged in the cylinder head, and the internal combustion engine is equipped with an operating device for separating the clutch device.

This invention provides a flexible gear and a harmonic reducer having the same. The flexible gear has a cylindrical structure and includes a transmission part. Along the axial direction of the transmission part, the inner peripheral wall of the transmission part has a segmented structure, and the segmented structure includes at least a first shaft segment, a second shaft segment, and a third shaft segment connected in sequence. The average wall thickness of the transmission part at the second shaft segment is not only greater than the average wall thickness of the transmission part at the first shaft segment but also greater than the average wall thickness of the transmission part at the third shaft segment. The outer peripheral wall of the transmission part has external teeth. The first and third shaft segments have unequal inner diameter structures, while the second shaft segment has a constant inner diameter structure. Along the direction from the first shaft segment to the third shaft segment, the inner diameter of the first shaft segment gradually decreases, and the inner diameter of the third shaft segment gradually increases, making it easier for the outer ring of the flexible bearing to be pressed into the inner side of the second shaft segment, and the outer ring of the flexible bearing is interference-fitted with the second shaft segment. This increases the wall thickness of the transmission part at the external teeth, improves the load-bearing strength of the external teeth, and solves the problem of easy cracking of the side wall of the transmission part at the external teeth.

The invention provides a pull-out type faucet and a magnet lining structure for the pull-out type faucet, the magnet lining structure comprises a sheath and a lining, the sheath is suitable for being fixedly connected to a water outlet elbow of the pull-out type faucet, the sheath comprises a mounting channel, the lining is at least provided with a magnetic attraction part, and the magnetic attraction part is provided with a magnet. The bushing is used for magnetically adsorbing a drawing head of the drawing type faucet, and the bushing is detachably mounted on the mounting channel through a buckle structure. The magnetic attraction lining structure is divided into a protective sleeve and a lining, the protective sleeve is fixedly connected with the water outlet elbow, and the lining is detachably installed on an installation channel of the protective sleeve through a buckle structure. The sheath actually increases the wall thickness of the water outlet bent pipe, and the whole wall thickness of the water outlet bent pipe does not need to be increased. And the bushing can be detached for replacement, so that the user operation is facilitated, and the like.

The invention discloses a method and a system for machining a female die of a special-shaped blanking die. The method comprises the following steps: machining an inner hole and a maximum outline excircle of a hollow cylinder by utilizing a numerical control lathe; the two end faces of the machined hollow cylinder are polished so that the two end faces of the hollow cylinder can be parallel; the outer wall of the hollow cylinder is milled with the ground bottom face of the hollow cylinder as the standard, a conical face cutting edge is obtained, and the conical face cutting edge is located on one side of the hollow cylinder; the milled hollow cylinder is subjected to vacuum quenching and ice-cooling treatment; and the two end faces of the hollow cylinder subjected to ice-cooling treatment are finely ground through a surface grinding machine. According to the method, through a numerical control turning procedure, when the inner shape of the cutting edge of the female die is machined, allowance is reserved, the wall thickness of the cutting edge of the female die is indirectly increased, the strength of the cutting edge is guaranteed, and the quality and the machining precision of the taper of the cutting edge machined by a numerical control coordinate grinding machine are guaranteed; and in the heat treatment process, the quenching hardness of the material is improved, so that the female die has higher hardness, and the sharpness and the wear resistance of the cutting edge are improved.

The invention relates to the technical field of oil well punching, in particular to a sand blasting perforator for well wall punching. According to the sand blasting perforator, the structure comprising the jet pipe and the expansion clamping part is designed, so that circumferential positioning and clamping of the jet pipe at an oil well perforating working position are achieved. And the expansion clamping part can be automatically butted, communicated and propped against the well wall under the action of gravity by utilizing the ingenious combination of two flow guide pipes and a plurality of hinge double connecting rods, so that the jet pipe is effectively prevented from shaking due to counter-acting force, and the punching precision and the working efficiency are greatly improved.

The utility model discloses a corrosion-resistant pipe fitting and a clamping device for surfacing welding, and relates to the technical field of pipe fitting machining, the corrosion-resistant pipe fitting and the clamping device for surfacing welding comprise a positioning mechanism connected with a surfacing welding machine, and the positioning mechanism comprises a box body connected to the surfacing welding machine through a mandrel; the fixed seat is fixed in the box body; the movable seat is movably arranged in the box body through a driving mechanism, the movable seat is matched with the fixed seat, and the pipe fitting can be clamped, so that a cosmetic welding layer, a filling welding layer, a transition welding layer, a backing welding layer and a surfacing layer can be sequentially surfaced on the pipe fitting by the surfacing welding machine. The corrosion-resistant pipe fitting is high in corrosion resistance.

The present invention belongs to the technical field of ball screws, and relates to an S-shaped internal circulation reverser assembly and installation method for a ball screw pair, comprising a screw, a nut, and a plurality of balls, wherein the nut is externally embedded on the screw, and the plurality of balls are arranged in a spiral raceway formed between the outer surface of the screw and the inner surface of the nut, and is characterized in that: a plurality of reverser mounting holes are axially arranged on the nut, and a reverser is respectively installed in each of the reverser mounting holes, and the two ends of the reverser are respectively connected to two adjacent spiral raceways to form a lead of ball circulation rolling; the positioning part of the reverser is matched with the limiting part arranged in the reverser mounting hole to realize the limiting setting of the reverser; the circumferential surface of the nut is provided with a sleeve by interference fit to radially limit the reverser. The present invention can reduce the difficulty of assembling the reverser, improve the structural strength and processing efficiency of the nut, prevent grease leakage, and reduce the overall noise of the ball screw pair.

The embodiment of the utility model discloses an anti-broken pipe structure and air conditioner, be used for preventing equipment pipeline from breaking, the anti-broken pipe structure includes drive subassembly, transmission subassembly and anti-broken piece, the drive subassembly is connected with the transmission subassembly and can drive the transmission subassembly to move, the anti-broken piece is located the movable range of the transmission subassembly, and the anti-broken piece is located in the movable range of the transmission subassembly. The transmission assembly can push the anti-breaking piece to be attached to the outer side of the pipeline so as to increase the wall thickness of the pipeline. In this way, the pipeline cannot be broken in the vibration process, and meanwhile the inner diameter of the pipeline cannot be changed.

The utility model discloses a compressible tunnel duct piece which comprises a duct piece body and a compression shell, the duct piece body is arc-shaped, the arc-shaped convex surface of the duct piece body is an outer wall surface, and the arc-shaped concave surface of the duct piece body is an inner wall surface; the compression shell is fixed to the outer wall face of the duct piece body. The elastic compression shell is additionally arranged on the outer wall of a conventional tunnel segment, the tunnel segment is suitable for a tunnel in an ultra-deep stratum, the plasticity of the compression segment is kept through the compression shell, stress caused by rock convergence can be restrained, the soil arch effect of a soil body is exerted, self-stabilization is achieved, and the engineering cost can be greatly reduced.

The invention provides an electromagnetic device, which comprises a skeleton, one side of a lower stop of the skeleton is provided with a bump, and the bump comprises a first surface and a second surface which are oppositely arranged, and a third surface which is vertically connected between the two surfaces; the at least one pair of pins comprises a first part, a second part and a third part which are vertically connected in pairs, the first part extends out of the bump through the second surface from the interior of the bump, and the second part extends out of the bump through the third surface from the interior of the bump; the coil is formed by winding a wire, the coil is wound on the cylinder and extends to the first surface of the bump, a first leading-out part of the wire is connected with the second part of one pin, and a second leading-out part of the wire is connected with the second part of the other pin. The large winding space and the small framework wall thickness can be achieved at the same time, the two lead-out parts of the wire are designed on different planes, and cross contact of the lead-out parts of the wire can be prevented.

The invention relates to a rear side part (1) of a motor vehicle body, comprising a C-pillar (2), a D-pillar (3) and a wheel housing section (4) which is produced as a one-piece sheet-metal molded component in a press stroke, the C-pillar (2) and the D-pillar (3) being C-shaped, U-shaped or hat-shaped in cross section, the side part (1) having adjacent regions, the C-pillar (2) and the D-pillar (3) being formed in a U-shaped, U-shaped or hat-shaped in cross section, the C-pillar (2) and the D-pillar (3) being formed in a U-shaped, U-shaped or hat-shaped in cross section, and the D-pillar (3) being formed in a U-shaped, U-shaped or hat-shaped in cross section. The adjacent regions have different tensile strengths and / or different wall thicknesses from each other.

The utility model provides an improved cooling cover for an auxiliary muzzle of a smoke hood. The improved auxiliary muzzle cooling hood of the smoke hood comprises an outer cylinder body and an inner cylinder body, the flange is mounted at the top end of the outer barrel; the inner cylinder body is arranged in the outer cylinder body, the top end of the inner cylinder body is communicated with the through opening in the flange, and an interlayer is formed in the space between the outer cylinder body and the inner cylinder body; the second partition plate is arranged in the interlayer, and the outer barrel body and the inner barrel body are connected in a welded mode through the second partition plate. The improved auxiliary muzzle cooling cover for the smoke hood has the advantages that the structure is simple, the manufacturing is convenient, the manufacturing period can be shortened, the manufacturing efficiency can be improved, and meanwhile, the product quality can be improved and the service life of the product can be prolonged by increasing the wall thickness of a heated part.

The present invention discloses a stator assembly, a motor and a vehicle. The stator assembly includes: a stator core, the stator core has a stator flow channel inside, the stator core includes: a first core segment and a second core segment, the first core segment has a core groove radially recessed from the surface of the first core segment, the second core segment has a core cooling hole axially penetrating the second core segment, and the core groove is connected with the adjacent core cooling hole to form the stator flow channel. When the stator assembly is applied to the motor, the inner wall of the motor casing does not need to be provided with an oil channel, so that the casing strength is good and the wall thickness does not need to be increased.

The utility model discloses a storage building fireproof thermal insulation outer wall, which belongs to the technical field of building construction, and comprises an outer wall body, the outer wall body is provided with a first wall body and a second wall body, the first wall body and the second wall body are both formed by piling concrete and bricks, and the outer surface of the first wall body and the outer surface of the second wall body are both provided with waterproof layers. A first fire retardant layer is fixedly bonded to the surface of the inner side of the first wall body, a first sound insulation plate is fixedly bonded to the other surface of the first fire retardant layer, and a second fire retardant layer is fixedly bonded to the surface of the inner side of the second wall body. The heat insulation core, the first sound insulation plate and the second sound insulation plate are arranged between the first wall body and the second wall body, and meanwhile, the fire retardant layer is additionally arranged, so that the fireproof safety performance of the outer wall can be greatly improved.

According to the technical scheme, the hole flanging structure is characterized in that the hole flanging structure comprises a lower die, the top of an ejector rod is fixedly connected with a floating block, the top of the lower die is fixedly connected with a female die, an upper die material pressing plate moves downwards through a first lifting mechanism, the upper die material pressing plate firstly makes contact with a product body and the female die for material pressing, and then the upper die material pressing plate makes contact with the female die; the upper surface of the lower floating block is designed to be a cambered surface, the middle of the lower floating block is high, the periphery of the lower floating block is low, and when a product body makes contact with the lower floating block, materials move towards the periphery, and the wall thickness of a flanged hole is increased. The arc face with the high middle and the low periphery is additionally arranged on the floating block to participate in forming, unused materials in the middle move towards the periphery to increase the wall thickness of hole flanging, the problems that the number of hole flanging process steps is large, and cracking occurs are solved, the floating block moves downwards, the ejector rod and the spring are arranged, and the spring can be compressed and expanded through the elasticity of the spring; and the floating block is jacked up through the jacking rod by means of expansion and bounce of the spring, and stripping of the product body is facilitated.