80results about How to "Strong enough" patented technology

The utility model relates to the technical field of PVC (polyvinyl chloride) pipe fittings, and discloses a pipe fitting for preventing floor drain fault, the main body structure of the connecting pipe fitting consists of an upper end pipe, a middle section secondary drainage pipe and a lower end pipe, and the structure is precise, reasonable and easy to implement. The research and development of the anti-fault pipe fitting not only can effectively prevent drainage of the floor drain from scouring a sand-lime layer, but also can enable water of the sand-lime layer to be smoothly discharged into a sewer line, and even can effectively prevent sand-lime from falling into the sewer line to cause blockage of the sewer line when the floor drain is installed in the decoration tiling stage; the filter net basket is fixed to the inner ring of the mounting ring, impurities are further filtered out, the anti-blocking effect is enhanced, the supporting columns and the mounting ring are connected through the tightening springs, and when water flow impact or external force is applied to the pipe fitting, the supporting columns can guarantee the stability of the filter net basket and the mounting ring and maintain the filtering and drainage performance of the pipe fitting by means of telescopic buffering of the tightening springs; and the home decoration drainage requirement is comprehensively met.

The utility model relates to a wheel technology field, concretely relates to a detachable wheel, including tyre, the inner ring of tyre is equipped with wheel cover, and tyre and wheel cover outer circle seal setting form a plenum, and the inner ring of wheel cover is evenly arranged with countersunk mounting hole along the circumference, and wheel cover is equipped with detachable wheel hub, and detachable wheel hub includes wheel hub outer circle cooperation installation with the inner ring of wheel cover, and wheel hub outer circle is equipped with wheel hub hub core, and the between wheel hub outer circle and wheel hub hub core along the circular center radiation spreads apart a plurality of spoke, and the between two adjacent spokes is equipped with detachable assembly cooperation with countersunk mounting hole. Independent plenum, will not leak in the wheel cover and wheel hub dismounting process. Wheel hub is through detachable assembly and realizes detachable, when wheel hub outer circle, wheel hub hub core or spoke etc. component appears damage, need not to replace whole wheel, only need to dismount and replace damaged wheel hub part, dismount convenient, greatly shorten the maintenance cost and maintenance time short.

This invention belongs to the field of downhole tools for oil drilling, specifically relating to a cycloidal gear reverser. The cycloidal gear reverser has an input shaft rotatably mounted within a housing. The lower end of the input shaft is fixedly connected to the upper end of an eccentric shaft assembly. A cycloidal wheel is fitted onto the eccentric block of the eccentric shaft assembly, and the circumferentially arranged external teeth of the cycloidal wheel connect with the internal teeth arranged on the inner wall of the housing. The upper end of a pin assembly is connected to the cycloidal wheel, and the lower end of the pin assembly is fixedly connected to an output shaft, which is rotatably mounted within the housing. The cycloidal gear reverser of this invention, through the cooperation of the eccentric shaft assembly, cycloidal wheel, and pin assembly, achieves higher strength, not only improving service life but also increasing the reverse torque transmitted to the stuck fish, thereby improving the efficiency and effectiveness of fish unblocking and expanding the range of wellbore sizes that the reverser can be used in.

The application discloses a particulate matter sensor and an air treatment device. The particulate matter sensor comprises a shell, a gas flow passage for a to-be-detected gas containing particulate matter is formed in the shell; a gas flow generating piece is in communication with the gas flow passage, the gas flow generating piece can drive the to-be-detected gas to pass through the gas flow passage, and a preset wind speed V of the gas flow generating piece satisfies 0.5 m / s≤V≤3 m / s; and an optical detection assembly is arranged in the shell, the optical detection assembly is used for generating a detection light beam, the detection light beam forms a light detection area at an intersection with the gas flow passage, the light detection area has a preset area S, S satisfies 16 mm 2 ≤S≤100 mm 2 , and the optical detection assembly outputs an electrical signal about a particulate matter concentration value according to the detection light beam scattered by the particulate matter.

The utility model discloses a lead-free environment-friendly copper alloy bar for a valve, which comprises a lead-free copper alloy bar body, a hollow hole is arranged at the center of the lead-free copper alloy bar body, a plurality of inclined planes are arranged on the surface of the lead-free copper alloy bar body at equal intervals, an anti-corrosion paint layer is arranged on the surface of the lead-free copper alloy bar body, and the anti-corrosion paint layer is arranged on the surface of the lead-free copper alloy bar body. The lead-free copper alloy bar has the advantages that through the arrangement of the hollow holes, the weight of the lead-free copper alloy bar body is reduced, meanwhile, enough strength is kept, meanwhile, resistance and thermal resistance are reduced, and the electric conduction efficiency and the heat conduction efficiency are improved; the copper alloy material is low in cost, low in cost and free of lead and chromium, meets international environmental protection standards, reduces potential hazards to the environment and human bodies, keeps high strength, high toughness and good machinability of a traditional copper alloy, and is suitable for manufacturing various valve parts.

The utility model relates to the technical field of pipe pile mechanical connection, and discloses a pin joint type and buckle type combined pipe pile mechanical connection structure which comprises a sleeve, an end plate is arranged in the middle of the sleeve, a steel pin rod is arranged on the inner wall of the end plate, a buckle groove is formed in the outer wall of the sleeve, a prestressed pipe pile is connected to the inner wall of the sleeve in a sleeved mode, and the prestressed pipe pile is connected with the buckle groove in a sleeved mode. A buckling groove is formed in the inner wall of the prestressed pipe pile, a buckling device is placed on the inner wall of the buckling groove, a first gasket is placed at the bottom of the buckling device, a second gasket is placed at the top of the buckling device, and a steel pin hole is formed in the inner wall of the prestressed pipe pile. According to the novel prefabricated pipe pile mechanical connecting structure combining pin joint type connection and buckle type connection, the problem of pipe pile connecting strength is solved, complicated and time-consuming welding or bolt reinforcement in the existing pile connecting process is avoided, the strength is sufficient, and meanwhile the pipe pile connecting efficiency is improved.

The embodiment of the invention provides a light-weight balcony suitable for a cruise ship and the cruise ship, the light-weight balcony is applied to the cruise ship and used for reducing the weight center height of the cruise ship, and the light-weight balcony comprises a plurality of supporting frames which are arranged on the peripheral wall of a cruise ship accommodation area at intervals and serve as a main body supporting structure of the balcony; the balcony body is made of a metal material meeting the set weight and density requirements of the balcony and comprises a fixedly connected balcony railing arranged at the end, away from the peripheral wall, of the supporting frame and a balcony floor fixedly connected with an upper panel of the supporting frame. And by adopting the combination mode of the supporting frame and the aluminum alloy balcony prefabricated part, fixed connection can be achieved only through bolts, and the construction difficulty is reduced. Meanwhile, the balcony prefabricated parts are made of aluminum alloy materials, on the premise that the strength is met, the self weight can be greatly reduced, the effects of controlling the cruise ship building cost and reducing the weight gravity center height are obvious, and the larger the tonnage of the cruise ship is, the larger the number of rooms is, the larger the total area of the corresponding balcony is, and the better the effect is.

This invention relates to the field of water remediation technology, specifically to a piezoelectric catalytic component and a groundwater remediation system. The piezoelectric catalytic component includes: an upper part of a piezoelectric catalytic body with a spiral channel communicating with an inlet, and a lower part with a cavity; the cross-sectional diameter of the spiral channel gradually decreases from the inlet to the end; a column is provided in the cavity, and a piezoelectric film is spirally wound around the column; the end of the spiral channel is close to the piezoelectric film at the upper end of the column; the piezoelectric film receives water containing organic pollutants flowing in from the spiral channel and catalytically degrades the organic pollutants through piezoelectric conversion; this application combines the static pressure of the water flow, accelerates the water flow through the spiral channel, the flow velocity gradually increases from top to bottom, the hydraulic impact load is correspondingly enhanced, the mechanical force flowing through the piezoelectric film is increased, low-frequency vibration excites the piezoelectric catalytic effect, maximizes the catalytic degradation capacity of the piezoelectric material, and thus improves the catalytic degradation efficiency of the piezoelectric material.

The utility model relates to the technical field of electronic cigarettes, and discloses a ceramic atomization core heating wire which comprises a heating wire body and a grabbing foot. The two ends of the heating wire are electrically connected with the two electrodes respectively. At least two heating wires are wound on the ceramic atomizing core side by side at a set interval in a snake-shaped or bow-shaped manner, and the two heating wires are densely distributed to form a heating area; and the electrode and the heating wire in the heating area are fixed on the ceramic atomizing core through grabbing feet. The at least two heating wires are arranged on the ceramic atomizing core side by side at the set interval, so that the heating uniformity is ensured, the atomizing efficiency and quality are improved, the fine taste and plumpness are improved, local heat accumulation can be effectively avoided, and carbon deposition generated by insufficient combustion is reduced; the coiled heating wire is fixed through the grabbing feet, the position of the heating wire is stabilized, the risk that the heating wire shifts or is separated from the atomization core is reduced, and therefore heating uniformity is kept.

The application discloses a kind of open roof rail vehicle body structure, including side wall, underframe, upper floor and staircase, the two sides of upper floor are connected with side wall, the lower end of staircase is connected to underframe, the upper end of staircase is connected to upper floor;Side wall, staircase and upper floor are all used profile structure, upper floor, staircase all include upper panel, lower panel and rib plate, rib plate is connected with upper panel, lower panel simultaneously, the lower panel of upper floor is welded and connected with side wall, the upper panel of upper floor is welded and connected with side wall by first connecting plate;Horizontal direction is extended on side wall and welded and fixed with backing plate, backing plate is used to support the lower panel of staircase.The application effectively solves the welding problem of staircase and underframe, side wall, and staircase is welded simply, and the stiffness and strength are sufficient, and is not easy to deform;Meanwhile, the application also avoids staff to side wall and upper floor in the lower of upper floor and upward welding, is favorable to guarantee the welding quality.

This invention discloses a polysiloxane microsphere, its preparation method, and its application. The polysiloxane microsphere has a D50 particle size of 0.1~10μm; the structural defect ratio S of the polysiloxane microsphere is S=T2 / T3, where S is 0.20~0.70; T2 refers to... 29 The relative abundance of Si NMR chemical shifts in the range of -50 to -60 ppm, T3 refers to... 29 The relative content of SiNMR chemical shifts in the range of -60 to -70 ppm; the low-temperature volatile content W of the polysiloxane microspheres is W = K1 / (K1+K2), where W is 0.027~0.893; K1 is the thermal weight loss ratio at 25℃~200℃, and K2 is the thermal weight loss ratio at 200℃~400℃. This solves the technical problem in the prior art where highly cross-linked polysiloxane microspheres form a dense network during calcination, making it difficult for internal pyrolysis gaseous products to escape and be removed.

The utility model discloses a heavy calcium carbonate device of quantitative conveying splashproof material guiding hopper relates to calcium carbonate processing equipment field, including conveying belt, hopper, inclined baffle and rubber elastic sheet, and the core innovation point is the discharge port flow observation window, adjustable quantitative baffle and spliced discharge port splashproof coaming, adjustable quantitative baffle is located in the hopper discharge port inboard, and the effective unloading width is changed through adjustable screw rod, the discharge port flow observation window is equipped with high accuracy horizontal scale to the baffle, and the inboard is coated anti -fog coating, and the spliced discharge port splashproof coaming is 3 detachable cold -rolled steel sheets, and the enclosure forms "U type " splashproof structure. The device solves the defect that the prior art has no quantitative adjustment, no splashproof protection, no flow monitoring, and adapts to heavy calcium carbonate efficient conveying demand.

The application relates to the field of discharging of electric vehicles, in particular to an electric vehicle charging socket adapter which comprises a shell, one end of the shell is provided with a five-hole socket, the five-hole socket comprises a base and a panel, the base is installed in the shell, the panel is installed on the base, a protection device is arranged on the base, the protection device comprises two plug protection assemblies and a three-plug protection assembly which are independent of each other, two-plug micro switches and three-plug micro switches are further arranged on the base, the two-plug protection assemblies are used for controlling the work of the two-plug micro switches, the three-plug protection assembly comprises a three-plug protection plate and a three-plug reset spring, the three-plug protection plate is slidably installed on the panel, one end of the three-plug reset spring is connected with the three-plug protection plate, and the other end of the three-plug reset spring is connected with the panel, the three-plug protection plate is provided with a three-plug sliding channel, and the three-plug protection plate is used for controlling the work of the three-plug micro switches. The application improves the problem of insufficient power supply of the adapter to the electric appliance in the traditional mode, and can achieve the effect of providing sufficient power for the electric appliance.

The present application relates to a kind of high-precision cold-rolled screw with medium carbon steel hot rolled wire rod in metallurgical technology field, preparation method and application.The present application is aimed at solving the technical problems of low first processing qualified rate of cold-rolled screw caused by poor material organization uniformity and low purity.The chemical composition of the wire rod according to the present application is as follows: C 0.52-0.58%, Si 0.15-0.35%, Mn 0.70-0.90%, Cr 0.10-0.35%, Al 0.015-0.045%, Ti≤0.0025%, [O]≤0.0015%, [N]≤0.0060% and the like, with the balance being Fe.The preparation method of the present application obtains uniform organization with cross-section hardness range ≤20HV through the combined action of narrow component design, continuous casting end electromagnetic stirring, high temperature diffusion annealing and "fast first and slow later" controlled cooling process.The present application is mainly used for manufacturing high-precision ball screw, and the finished product precision reaches more than 5 levels, with first cold-rolled forming qualified rate ≥85%.

The utility model relates to the technical field of fret saw tools, in particular to a double-finger force application pull ring fret saw structure which comprises a handle part, a connecting part and a fret saw part. The handle adopts a Y-shaped design, and a circular ring is arranged at the tail end and is matched with fingers to apply force; the connecting part is fixed with the handle and the fret saw through a high-strength metal piece, and a double-fixing device is provided; the fretsaw is of a closed annular structure and is made of high-carbon steel, and the surface of the fretsaw is polished to reduce friction resistance. The cutting efficiency and safety can be improved through uniform force application and stable connection, meanwhile, portability is enhanced through lightweight design, and the cutting device is suitable for various complex scenes.

The utility model relates to animal medical equipment technical field provides a kind of anti-grabbing animal blood collection frame, comprising: animal corral, blood collection frame door, support plane and multiple movable arm fixing frame;The animal corral is left with opening;The animal corral is respectively welded with door clamping channel steel in opening two sides, the first stainless steel plate is welded in the opening lower of the animal corral;The blood collection frame door is movably arranged in door clamping channel steel;The support plane is fixedly connected on the first stainless steel plate;Multiple movable arm fixing frame is movably arranged on the support plane.The utility model can effectively improve blood sampling safety, reduce the stress response of giant panda, can improve the convenience and efficiency of blood sampling operation, and adapt to different panda individuals, with the characteristics of stable structure, strong durability.

The invention discloses an easy-to-lay thermohaline profile observation system and a laying method thereof. The system is composed of an overwater floating body unit, an underwater observation unit, a connecting cable and a water-soluble auxiliary device. The device is restrained to be of a compact integrated structure before being put, and self-driven switching from a restrained state to an observation state is achieved based on sequential dissolution of a controllable degradable material after the device enters water; the water-soluble stent, the bandage and the buckle are preferably selected from a PVA / CMC system, and have both dry and wet strength and predictable dissolution rate. The cable is subjected to piecewise linear constraint, and locking force is gradually reduced from bottom to top, so that orderly unfolding of releasing the cable at a bottom section and releasing the cable at an upper section is realized, initial disturbance is reduced, and the unfolding success rate is improved. Through cambered surface lifting and anti-slip limiting, streaming interference is reduced, flexible connection of a shallow-draft floating body, small floating balls arranged along a cable and a bottom end counterweight are matched, the unfolded chain shape tends to be perpendicular, and the device is suitable for continuous observation of a thermohaline section within the depth range of about 5-100 m.

This utility model relates to the field of I-beam wheel technology, specifically to a high-strength I-beam wheel. The steel plate used in this utility model is not thick, but it is sturdy, durable, economical, and practical. The wheel rim is rounded, and the reinforcing rib cavity has several raised cavities punched from the inside out. The end plate and the reinforcing rib cavity are uniformly welded by spot welding, saving time and providing sufficient strength. By utilizing several folded reinforcing ribs, the fatigue caused by direct stress on the end plate can be distributed.

The utility model relates to the technical field of oral cavity cleaning tools, in particular to a toothbrush which comprises a toothbrush head and a toothbrush handle, the toothbrush head comprises a base plate, a plurality of bristle planting holes are formed in one side of the base plate, bristle bundles are arranged in the bristle planting holes, the sectional area of each bristle planting hole is 3.0 mm2-7.5 mm2, the minimum distance between every two adjacent bristle planting holes is larger than 0.6 mm, and the toothbrush handle is arranged on the base plate. The minimum distance between the bristle planting holes and the edge of the base plate is larger than 1 m. According to the toothbrush, by adjusting the sectional area range of the bristle planting holes, the distance between the adjacent bristle planting holes and the distance between the bristle planting holes and the edge of the base plate, the wall of each bristle planting hole has enough thickness and strength, pressure from bristle bundles can be borne, and the situation that the bristle planting holes crack is avoided.

The invention discloses a preparation method for constructing a multistage micro-nano heterostructure based on combination of a laser melting deposition process and a laser shock peening means, which comprises the following steps of: printing by using dry TC4 alloy powder, accumulating a printed TC4 metal printing layer to form a TC4 metal micron layer, performing low-power laser shock peening on part of the TC4 metal micron layer to form a TC4 metal submicron layer, and forming the multistage micro-nano heterostructure. A TC4 metal printing layer is printed on the submicron layer and subjected to high-power laser shock peening to form a TC4 metal nano layer, a TC4 metal printing layer is printed on the nano layer and subjected to low-power laser shock peening to form a TC4 metal submicron layer, printing and cyclic operation are continued on the submicron layer to form a sample, and the sample is obtained through annealing treatment. According to the preparation method disclosed by the invention, a micron layer-nano sandwich composite layer-micron layer multi-stage micro-nano heterostructure is formed, crack propagation is effectively hindered, and the elongation of the material is improved, so that alloy strength and plasticity synergistic strengthening is realized.

In some embodiments, a robotic arm and a robotic system including the robotic arm are provided. In some embodiments, the robotic arm includes a base unit and a drive unit, wherein the base unit includes a base motor and a base, and the drive unit includes a quadrilateral linkage, a first drive motor, and a second drive motor. Other exemplary embodiments are described herein. In some embodiments, the robotic arm achieves both rotational and linear motion while minimizing its physical footprint for easier storage and transport.

This invention discloses a positioning stent for convenient fixation and safe removal within human blood vessels, relating to the field of surgical medical device technology. The positioning stent comprises: a metal wire stent with multiple pointed positioning spikes, each spike including an inner metal wire and a covering layer; the inner metal wire is connected to the metal wire of the metal wire stent, the diameter of the inner metal wire being smaller than the diameter of the metal wire of the metal wire stent; the covering layer is conical and made of a biodegradable material; the tips of the inner metal wires and the tips of the covering layer are spaced a predetermined distance apart, and the middle portion of the inner metal wire forms a spiral portion; after the covering layer degrades, the spiral portion changes from a compressed state to an extended state, allowing the inner metal wire to pierce the blood vessel wall, with a predetermined gap between the blood vessel wall surface and the surface of the metal wire stent. This invention achieves reliable stent fixation and safe removal.

The application discloses a whole pre-buried test-bed foundation of a wind turbine, which comprises a flat plate, anchor rods, anchor plate assemblies, anchor bolts and a steel mesh, and discloses a construction method of the whole pre-buried test-bed foundation of the wind turbine, which comprises the following steps: determining a test-bed reference surface elevation and center positioning marking, and positioning marking of the anchor bolts; fixing the anchor bolts on the steel mesh, and pouring bottom layer concrete; threadedly connecting lower ends of the anchor rods to the anchor plate assemblies; and pouring concrete three times and installing the flat plate. Compared with a whole foundation of a pre-buried large steel structure, the foundation has sufficient strength on the basis of a small amount of steel; the whole forming technology of layered pouring construction can improve the overall vibration resistance and reliability of the connection between the flat plate and the foundation; in addition, the pre-buried parts, i.e., the flat plate, the anchor rods, the anchor plate assemblies and the anchor bolts, are all threadedly connected, so that the reliability of the foundation can be improved.

The utility model discloses a quick detachable large -caliber titanium plate head, including main pipeline and the head end cover of sealing connection in the end part of main pipeline, and the head quick detach mechanism for fastening head end cover is equipped with in main pipeline outside, head quick detach mechanism includes the head fastening support axle of setting along the direction of parallel to main pipeline axis, and the fastening connecting rod is connected with through first fixed hinge in head fastening support axle end part, and fastening connecting rod side has the joint cooperation groove, the quick detachable support ring of coaxial arrangement with main pipeline is fixed with in head end cover outside, and the joint connecting ring of coaxial arrangement with it is fixed with in quick detachable support ring outside, and the joint cooperation groove is in joint cooperation in joint connecting ring, the utility model discloses the structure design of quick detachable, can when needing to overhaul, maintain or replace part to equipment inside, quick detachable head, save time and manpower cost, improve work efficiency.

The utility model relates to bridge construction equipment technical field, concretely is a kind of bridge edge protection movable steel stand device, including finished steel sheet, the bottom end side welding of adjacent finished steel sheet net is fixed with base connecting rod square steel between through stand square steel connection fixed, the bottom of base connecting rod square steel is equipped with U-shaped clamp, the top of base connecting rod square steel is equipped with movable screw rod, U-shaped clamp is fixed with beam body wing board clamping, and through the bottom end compaction positioning of movable screw rod.The bridge edge protection movable steel stand device in this, by using U-shaped clamp and beam body wing board clamping fixed, and through the compaction positioning of movable screw rod mode, avoid the damage of welding or bolted to beam body embedded steel, effectively protect the overall structural strength and stability of beam body.The device overall design is movable, by loosening movable screw rod, movable stand device can be easily disassembled and moved, greatly facilitate subsequent construction and maintenance.

This application relates to a support base for a bridge erection mechanism, belonging to the field of bridge erection technology and equipment. It includes a frame assembly with a support assembly mounted on it, the support assembly being vertically arranged. Connecting components are provided at both ends of the frame assembly, and the connecting components are fixedly connected to the frame assembly. This application has the advantages of reducing rocker arm deformation during operation, completing the erection of combined bridges, ensuring stable and reliable operation, and guaranteeing the driver's visibility during operation.

The utility model discloses a kind of shear wall high-low grade concrete separation stubble tools, install between pouring formwork, including stubble panel and stubble edge, pouring formwork is fixed by opposite pull screw on both sides, the end of stubble edge is attached to opposite pull screw, horizontal reinforcement and vertical reinforcement are provided between pouring formwork and two vertical stubble reinforcement are further fixed on horizontal reinforcement, two vertical stubble reinforcement are connected with stubble panel parallel stubble tie, both ends of stubble tie are hooked on vertical stubble reinforcement and stubble tie is attached to the side of stubble panel far from stubble edge, the both sides of stubble panel pour concrete of different grade. The rigidity of the present stubble tool is big, not easy to be destroyed, both sides are vibrated and compacted in the process of pouring, there is no cold joint, the situation that low-grade concrete flows into high-grade side and high-grade concrete flows into low-grade side will not appear, so that the situation of concrete strength deficiency and waste cost will not appear.

The utility model relates to the technical field of oral cavity cleaning tools, in particular to a toothbrush which comprises a toothbrush head and a toothbrush handle, the toothbrush head comprises a base plate, a plurality of bristle planting holes are formed in one side of the base plate, the section of each bristle planting hole is square, the side length of each bristle planting hole is parallel to and aligned with the side length of the adjacent bristle planting hole, and the toothbrush handle is arranged on the base plate. The side length of each bristle planting hole ranges from 2.2 mm to 3.2 mm, the minimum distance between every two adjacent bristle planting holes in the length direction of the base plate is larger than or equal to 0.8 mm, and the minimum distance between every two adjacent bristle planting holes in the width direction of the base plate is larger than or equal to 0.5 mm. According to the toothbrush provided by the utility model, the space between the bristle planting holes can be utilized to the maximum extent, so that the density of the bristle bundles is improved, meanwhile, the hole walls of the bristle planting holes have enough thickness and strength, and the situation that the bristle planting holes deform or the bristles are exploded due to the fact that the bristle bundles are extruded in the bristle planting holes is effectively avoided.

The invention discloses a heat shield riveting fixing structure and a mounting method thereof, the structure comprises a rivet, a heat shield, a gasket and an adjusting sheet, the heat shield is arranged on one side of the adjusting sheet, the gasket is arranged between the heat shield and the adjusting sheet, and the rivet sequentially penetrates through the heat shield and the gasket and then is connected with the adjusting sheet. By means of the structure, the riveting reliability of the rivet can be improved, it is guaranteed that certain high-temperature deformation is released in a reserved gap of the fixing portion of the heat shield, and the situation that local high-temperature gas leaks into a spray pipe adjusting piece and a heat shield interlayer due to large-area stress concentration, large deformation and crack chipping of the heat shield is avoided; the completeness of a cooling flow path at the adjustable nozzle adjusting sheet part is kept, and the use reliability of the adjustable nozzle adjusting sheet of the engine is ensured.