407 results about "Type metal" patented technology

The utility model relates to the technical field of wave-absorbing material testing, and discloses a wave-absorbing material flat plate reflectivity testing device which comprises a flat plate sample table and a horn antenna matched with the flat plate sample table, the flat sample table comprises a cylindrical rod, a base, a rotating track, a table top and an inverted T-shaped metal panel which are connected with one another; the inverted T-shaped metal panel is driven to rotate along the circumferential direction when the rotating track on the table top rotates; the testing sample is arranged on one side face, facing the horn antenna, of a vertical panel of the inverted-T-shaped metal panel, and when the rotating track rotates in the circumferential direction, the inverted-T-shaped metal panel is driven to rotate in the circumferential direction, or the angle between the vertical panel and a horizontal panel of the T-shaped metal panel is adjusted, so that the testing sample is tested. And direction angles and pitch angles between the plane of the test sample and the horn antennas can be adjusted. The device has the advantages of being flexible and convenient to use, small in occupied area, capable of achieving multi-stage adjustment, high in testing precision and the like.

The invention relates to the technical field of oil and gas reservoir exploitation equipment, in particular to a compression type metal packer which is used for solving the problem that a high-temperature and high-pressure deep well rubber cylinder serving as a sealing element cannot meet operation requirements, and the compression type metal packer comprises a first connector and a second connector which are connected to the upper end and the lower end of a central pipe; a sealing mechanism is arranged in the middle of the central pipe and comprises a metal sealing cylinder, a sealing ring and a sealing ring; the upper sealing cone sleeves the central pipe and is arranged at the upper part of the metal sealing cylinder; the lower sealing cone sleeves the central pipe and is arranged at the lower part of the metal sealing cylinder; the metal sealing cylinder is made of nickel-titanium-based superelastic alloy; the metal sealing cylinder is made of nickel-titanium-based superelastic alloy, annealing treatment is conducted at the temperature of 650 DEG C, thermal circulation and mechanical training are conducted at the temperature above the phase change temperature, the stable mechanical performance is obtained, the ideal deformation rate can be obtained under the small load effect, the setting force and the unsetting force are reduced, and the metal sealing cylinder is suitable for high-temperature and high-pressure deep well operation.

The invention discloses a free filling type metal wire embedded solid propellant forming device and process, and belongs to the field of solid propellants, the free filling type metal wire embedded solid propellant forming device comprises a bottom plate, a base, a mold cylinder and a top cover are sequentially arranged on the bottom plate, and a plurality of pressing structures are arranged on the upper portion of the top cover; a solid propellant coating barrel is arranged on the inner wall of the mold barrel; the lower end of the metal wire is fixed on the bottom plate, the upper end of the metal wire is fixed on the first fastener of the fastener mounting block on the top cover, and the first fastener is screwed into the threaded hole, so that the metal wire can be tensioned, and the internal stress of the metal wire can be adjusted by adjusting the expansion amount of the metal wire; according to the invention, the collimation of the metal wire in the propellant is ensured, the proper stress of the metal wire in the slurry casting process is also ensured, the problem that the metal wire is broken due to overlarge stress is avoided, and the technical problem that the yield of the solid propellant is low due to the fact that the metal wire is easy to break in the propellant in the prior art is solved.

The utility model relates to the technical field of laser cutting, and discloses a thin metal plate laser cutting machine which comprises a laser cutting head, an installation support is installed on the outer wall of the laser cutting head, a small motor is installed at the end, away from the laser cutting head, of the installation support, and a power gear is installed at the output end of the small motor. According to the thin metal plate laser cutting machine, the position, located on the outer side of the laser cutting head, of the surface of a metal plate is polished through rotation of the polishing piece, residual molten metal on the surface of the metal plate is polished through polishing of the polishing piece, and therefore the smooth effect of the surface of the metal plate at the cutting position is improved, and the cutting quality is improved; and through cooperation of an inner adsorption magnet and an outer adsorption magnet, chippings generated by polishing are adsorbed, and the situation that the metal chippings generated by polishing are left on the surface of a plate, additional cleaning work needs to be conducted, and the subsequent laser cutting quality can be affected when the metal chippings are left on a cutting route is prevented.

The invention discloses a clamping structure and method for a special-shaped metal piece, and relates to the technical field of metal piece clamping. According to the clamping structure and method for the special-shaped metal piece, when the metal piece is clamped, if the metal piece is a regular metal piece, a worker directly extrudes the two deflection clamping plates towards the metal piece, the clamping plate is passively deflected backwards, an extrusion spring rod drives the clamping plate to effectively clamp the metal piece, and the clamping effect is good. If the metal piece is of a special-shaped structure, after the clamping plate preliminarily clamps the metal piece, a third hydraulic cylinder is adjusted to drive a guide rail to deflect to the outer side of the metal piece, then a second hydraulic cylinder is adjusted to drive a lock frame to move to make contact with the outer side wall of the metal piece, and a rotating motor is started; and the rotating motor drives the lock frames to be finely adjusted, so that interaction force exists between the lock frames and the metal piece, the lock frames in the four directions are matched with the two clamping plates to achieve clamping of the special-shaped metal piece, the clamping firmness is improved, and the stability effect in the machining process of the special-shaped metal piece is ensured.

The invention discloses a thread machining device for metal part machining, and relates to the technical field of metal machining equipment.The lower end of a lifting sliding plate is provided with an angle adjusting assembly, the upper end of the lifting sliding plate is fixedly provided with a rotating assembly, the rotating assembly is used for driving the angle adjusting assembly to rotate, and the angle adjusting assembly is provided with a thread machining assembly; a tapping cutter is detachably installed on the thread machining assembly. Transverse clamping assemblies used for transversely clamping a metal piece are installed at the two side ends of the main body base in the transverse direction. Longitudinal clamping assemblies used for longitudinally clamping the metal piece are installed on the transverse clamping assemblies. A clamping through hole is formed in the center of the main body base, and a three-jaw clamping seat used for clamping the tubular metal part is mounted in the clamping through hole; through the synergistic effect of the rotating assembly and the angle adjusting assembly, the tool can be positioned at will within the inclination range of 0-90 degrees, and multi-angle machining of a complex curved surface is achieved in cooperation with position adjustment of the arc-shaped guide rail.

The present invention relates to the field of laser welding equipment, and in particular to an environmentally friendly fully automatic laser welding device and method for metal steel plates, comprising a steel plate laser welding device, wherein the steel plate laser welding device comprises a casing, a workbench is installed at the front of the casing, a light-transmitting plate is installed in the middle of the workbench, a projection plate is arranged on the lower side of the light-transmitting plate, mounting frames are fixedly connected to both sides of the projection plate, the mounting frames are installed at the bottom of the workbench, a blackout curtain is slidably connected to the bottom of the workbench through a guide rail, the blackout curtain surrounds the mounting frame and the projection plate, industrial cameras are installed at the bottom of the mounting frame and the top of the casing, the industrial cameras are electrically connected to a control box, the control box is installed at the bottom of the casing, and a welding robot arm is arranged at the rear of the workbench. The present invention can effectively improve the absorption efficiency of laser energy by the steel plate to be welded during welding by spraying a black organic coating.

The utility model relates to an enlarged type metal composite viscoelastic damper. The bottom of a metal damper is fixedly connected with an enlarged type viscoelastic damper. The metal damper comprises a T-shaped core plate, L-shaped restraining plates are fixedly connected to the two opposite sides of the T-shaped core plate in the vertical direction, friction areas are arranged between the tops, located on the vertical plane, of the L-shaped restraining plates and the T-shaped core plate, fixing areas are arranged between the bottoms of the L-shaped restraining plates and the T-shaped core plate, and energy dissipation webs are arranged on the portions, between the fixing areas and the friction areas, of the T-shaped core plate. The amplified viscoelastic damper comprises an upper connecting plate, an amplifying lever is hinged to the lower portion of the upper connecting plate, an inner steel plate is hinged to the lower portion of the amplifying lever, the inner steel plate is connected with an outer steel plate through a viscoelastic layer, and the outer steel plate is hinged to the amplifying lever through a fulcrum shaft. The defects of a metal damper can be overcome under small earthquakes, good energy consumption is achieved, the amplifying damper can be protected against excessive displacement and failure under large earthquakes, the damper consumes energy in a multi-stage mode, and the anti-seismic performance of the structure is improved. The components are connected through bolts, are highly assembled and are convenient to replace.

A method for friction stir forming a metal matrix composite (MMC) structure (76). The method includes the step of providing a substrate (12) comprising a metallic material and securing a preformed MMC layer (14, 16) comprising an MMC material in a position overlying at least a portion of the substrate (12). The method further includes the step of friction stirring the preformed MMC layer (14, 16) with a friction stirring tool (50) which includes a rotating probe (56), including locating the probe (56) at a stirring depth at which the probe (56) extends through the preformed MMC layer (14, 16) into a portion of the substrate (12) and passing the tool (50) through the preformed MMC layer (14) at the stirring depth to friction stir the preformed MMC layer (14, 16) and integrate the preformed MMC layer (14, 16) with the substrate (12).

The present disclosure relates to a fabrication and evaluation process for testing new metallic alloy chemistries and compositions for laser powder bed fusion (L-PBF). The new methodology is efficient and effective for new compositions with a minimal investment of generating large quantities of powder feedstock for required in conventional AM processing. The method allows for subsurface melting of the new alloy composition by varying the depth of penetration by a control of the input power level, power deposition rate, and rastering scan strategy. Post-mortem analysis of the subsurface microstructure permits an analysis of the durability and suitability of the new metallic alloy for this manufacturing mode. The method utilizes available infrastructure, technology, and characterization techniques.

According to the special-shaped metal product inner hole grinding device and method, the distance between double grinding heads is adjusted through a two-way lead screw, lifting feeding and differential rotation are combined, and efficient precision machining of a special-shaped inner hole is achieved. The device comprises an adjustable grinding head mechanism, a servo drive rotating unit and a sectional feeding system, and is suitable for batch production of complex inner holes.

The invention discloses a numerical control type metal powder compression molding device, and relates to the technical field of compression molding. The problem of machining efficiency is solved. The forming die and the portal frame are fixedly installed on the outer wall of the top of the base, a feeding mechanism is arranged on one side of the top of the forming die, the same set of pressing forming mechanism is arranged on the inner wall of the other side of the forming die and below the portal frame, and a discharging mechanism is arranged on the side wall of the forming die; and the pressing forming mechanism comprises a pressing die, a top die and a female die fixedly embedded in the inner wall of the forming die, the top die is movably matched with the interior of the female die, and the female die is of a cavity structure. The top die serving as a bottom support is connected with the hollow cylinder through the cavity pipe, and the gas control assembly is arranged at the bottom of the cavity pipe, so that after forming is finished, positive pressure provided by the gas control assembly is used for enabling the top die to ascend, metal materials are jacked, follow-up material taking is facilitated, and the machining efficiency is improved.

The utility model discloses a hollow shaft blank friction welding port which comprises a first hollow shaft and a second hollow shaft, the end face of the first hollow shaft is a first welding face, the end face of the second hollow shaft is a second welding face, the first welding face corresponds to the second welding face, a first prefabricated groove is formed in the inner circumference of the first welding face, and a second prefabricated groove is formed in the inner circumference of the second welding face. A first prefabricated groove is formed in the inner circumference of the first welding face, a second prefabricated groove is formed in the inner circumference of the second welding face, the first prefabricated groove corresponds to the second prefabricated groove, and through the asymmetric structure of the first prefabricated groove and the second prefabricated groove, different first hollow shafts and second hollow shafts are correspondingly adjusted in a targeted mode. The inner circumferential diameter of the plastic metal and the inner circumferential diameter of the second hollow shaft are kept consistent, the plastic metal is prevented from protruding to form large flashes, the speed that the plastic metal on the two sides is converted into high circumferential expansion due to opposite pressure in the friction heat production stage is effectively reduced, and the filling rate of the plastic metal is improved.

The present invention relates to the field of laser welding equipment, and particularly relates to an environment-friendly fully automatic laser welding device and method for metal steel plates, including a steel plate laser welding device. The steel plate laser welding device includes a machine shell. A workbench is installed at the front part inside the machine shell. A light-transmitting plate is installed in the middle of the workbench. A projection plate is arranged on the lower side of the light-transmitting plate. Installation frames are fixedly connected to both sides of the projection plate, and the installation frames are all installed at the bottom of the workbench. A light-shielding curtain is slidably connected to the bottom end of the workbench through a guide rail, and the light-shielding curtain surrounds the installation frames and the projection plate. Industrial cameras are installed at the bottom of the installation frames and the top inside the machine shell, and the industrial cameras are electrically connected to a control box. The control box is installed at the bottom inside the machine shell. A welding robotic arm is arranged at the rear part of the workbench. In the present invention, the sprayed black organic coating can effectively improve the absorption efficiency of the laser energy by the steel plate to be welded during welding.

The present invention discloses a welding device for welding a metal basket. The metal basket includes an L-shaped metal bar, a metal hoop, and a bottom ring. The metal bar includes a first bend and a second bend. The welding device comprises: a horizontal moving mechanism; a fixing device disposed on the horizontal moving mechanism, the fixing device being used to fix the metal bar and the metal hoop and capable of twisting the second bend; a first welding mechanism disposed at one end of the horizontal moving mechanism in the conveying direction and used to weld the first bend to the bottom ring; and a second welding mechanism disposed on both sides of the horizontal moving mechanism in the conveying direction and used to weld the second bend to the metal hoop. The welding device proposed by the present invention can automatically weld metal baskets, reducing labor costs.

The invention discloses a self-correcting forging press for a metal plate, which comprises a forging press body, a clamping mechanism and a pushing mechanism, the clamping mechanism is arranged on a pedestal piece, and the clamping mechanism is in butt joint with a first conveying belt for automatically picking and clamping a metal aluminum forging plate blank during feeding; the clamping mechanism is arranged on the first conveying belt and used for automatically positioning and discharging metal aluminum forging plate blanks before being in butt joint with the forging press body for forging and pressing, the clamping mechanism is used for automatically discharging formed metal aluminum forging plates after being in butt joint with the second conveying belt for forging and pressing, and the pushing mechanism is arranged on the first conveying belt and used for automatically and accurately filling the metal aluminum forging plate blanks into the clamping mechanism. According to the self-deviation-rectifying forging press for the metal plate, automatic picking, clamping, positioning and discharging of a metal aluminum forging plate blank are achieved, automatic discharging of a formed metal aluminum forging plate is achieved, the automation performance is guaranteed, in addition, automatic deviation rectifying treatment of the metal aluminum forging plate blank in the conveying process is achieved, and the filling accuracy in the picking process is guaranteed.

The invention discloses a casting defect diagnosis and closed-loop control system and method based on causal anti-fact and multi-agent arbitration. The system collects multi-source data such as temperature, flow, cooling, vision and the like, learns a causal structure, establishes an agent model and solves an adjustment scheme which enables the defect probability to be remarkably reduced in a security domain; performing evidence verification on the suggestions through verifiable generation and a knowledge graph, fusing vision, process, metallurgy and simulation agent arbitration, executing in an edge-cloud double ring, and triggering security rollback abnormally; and when the uncertainty is increased, active learning and incremental updating are implemented. According to the scheme, the defects of shrinkage cavities, air holes and the like can be remarkably reduced, the first-pass yield is improved, and the method is suitable for aluminum alloy sand molds, metal molds and low-pressure casting production lines.

The invention discloses an environment-friendly metal combined smelting furnace, relates to the field of metal smelting equipment, and aims to solve the problems of low efficiency, heat energy waste, waste gas pollution, inconvenience in operation and the like of a traditional smelting furnace. The environment-friendly metal combined smelting furnace comprises a smelting furnace support, a rotatable high-temperature smelting furnace is arranged on the support, and a liftable metal preheating furnace is arranged above the support; a smelting crucible and a combustor are arranged in the high-temperature smelting furnace, and a multi-layer heat insulation structure is arranged on the outer side; a preheating box is arranged in the metal preheating furnace, forms an exhaust cavity with the furnace wall, and is butted with the high-temperature smelting furnace through a waste gas guide pipe to realize secondary combustion of waste gas; according to the equipment, waste heat recovery and waste gas harmless treatment are achieved, the energy utilization rate and the environmental protection property are improved, operation is convenient and fast, and the equipment is suitable for smelting of various kinds of metal.

The invention discloses a wall type Z-shaped metal torsion tube damper anti-seismic system and method. The wall type Z-shaped metal torsion tube damper anti-seismic system comprises a frame beam, a frame column, a cantilever wall and a Z-shaped metal torsion tube damper. The frame beams and the frame columns are connected with a building, the cantilever walls are connected with the frame beams, and the Z-shaped metal torsion tube dampers are arranged between the paired cantilever walls and connected with the cantilever walls so as to dissipate energy transmitted by the cantilever walls. According to the damper anti-seismic system, the Z-shaped metal torsion tube damper is arranged to replace a traditional mild steel metal damper and a viscous damper to conduct damping design of a building structure, the problem that the low-cycle fatigue performance of the traditional metal damper is poor is solved, the oil leakage risk of the viscous damper is avoided, and the anti-seismic performance of the building structure is improved. Moreover, due to the structural design in the damper, the influence of the bending and shearing effect on the deformation of the torsion tube under the action of an axial load is eliminated, so that the section of the torsion tube is always kept a stable circular section in the hysteresis energy consumption period of the torsion tube, and the energy consumption efficiency is ensured.

The feeding device for the double-cone rotary drying machine comprises a drying machine body, a metal disc, a feeding cover, an arc-shaped welding plate and a spring clamping plate, a double-cone rotary drying tank is installed in the drying machine body, the metal disc is fixed to a feeding port of the double-cone rotary drying tank, and a small metal bearing is horizontally installed on the left side of the upper end of the metal disc. A fixed rod is longitudinally fixed in an inner ring of the small metal bearing, a feeding cover is fixed at the other end of the fixed rod through a welding block, and the design solves the problems that in the using process of an original double-cone rotary drying machine, a cover on a feeding port is mostly fixed through bolts, so that the feeding process is tedious, great inconvenience is brought to feeding work, and the working efficiency is high. The rotary magnetic attraction and spring clamping type limiting structure is good in practicability, the feeding cover can be rapidly mounted or dismounted, the subsequent work use of workers cannot be affected, and the rotary magnetic attraction and spring clamping type limiting structure is convenient to use.

The utility model discloses a safety type metal compensator, which relates to the technical field of metal compensators, and comprises a metal compensator main body and connecting flanges arranged at two ends of the metal compensator main body, and a damper spring is arranged on the outer side surface of the metal compensator main body. A first supporting piece and a second supporting piece are installed on the outer side surface of the metal compensator body, the first supporting piece comprises two first clamping blocks, the second supporting piece comprises two second clamping blocks, and the outer side surfaces of the first clamping blocks and the outer side surfaces of the second clamping blocks are fixedly connected with the outer side surface of a damping spring. Through cooperation of the first supporting piece and the second supporting piece, deformation of the damping spring is relieved, the normal state of the pipeline or the metal compensator body is kept, excessive deformation or failure is prevented, and therefore the stability and reliability of the metal compensator body are kept, pipeline leakage or damage caused by failure of the metal compensator body is prevented, and the service life of the pipeline is prolonged. And the safety of the system is improved.

The invention discloses a nano precipitated phase reinforced refractory high-entropy alloy and a preparation method thereof, and relates to the technical field of preparation of novel metal materials. According to the method, the NbMoTaW refractory high-entropy alloy serves as a base material, the phase separation phenomenon of the base is effectively induced by introducing a high-proportion Zr element into the base, and the formation of a nanoscale precipitated phase which is evenly and dispersively distributed is successfully achieved by combining specific solid solution and aging treatment processes. The refractory high-entropy alloy prepared through the method shows excellent performance characteristics, the basic properties of the material are remarkably improved, more possibilities are provided for application of the refractory high-entropy alloy in an extreme environment, and the refractory high-entropy alloy is expected to be widely applied and developed in the fields of aerospace, nuclear industry and the like.

The invention discloses a ratchet effect-based nuclear-grade steel long-term service aging damage evaluation method, which comprises the following steps: S1, taking a plurality of samples with different aging durations, carrying out a ratchet fatigue test on each sample to obtain a curve of evolution of ratchet strain along with cycle cycles, linearly fitting the slope of a stable stage, and calculating a relative ratchet strain rate; s2, determining aging damage parameters corresponding to different aging durations according to the difference between the service lives of the samples with the aging durations being zero and the service lives of the samples with the aging durations being greater than zero; s3, establishing a relational expression between the relative ratchet strain rate and the aging damage parameter; and S4, the step S1 is repeated, the relative ratchet strain rate of the material under other working conditions is calculated, aging damage parameters are calculated according to the relational expression, and the aging damage state is evaluated. According to the evaluation method, aging damage evaluation of most types of metal materials of the nuclear power station can be achieved only through few stress cycles, time and cost are saved, evaluation efficiency is improved, the number of parameters is small, and calculation is simple.

An open riser anti-gravity mold filling integral solidification process device comprises anti-gravity casting equipment, a casting mold, a contact, a cut-off mechanism, a guide sleeve and a plunger. The casting mold is one or a combination of a sand mold, a metal mold and a ceramic mold, the casting mold is composed of a bottom sprue layer, an upper structure layer and an internal structure, and an open riser is arranged at the top of the upper structure layer in the casting mold; and the contact is positioned in the open riser of the casting mold. The invention further claims to protect an open riser casting mold anti-gravity mold-filling integral solidification process method using the open riser anti-gravity mold-filling integral solidification process device. The open riser casting mold anti-gravity mold-filling integral solidification process method sequentially comprises the following steps: preparing a casting mold; installing equipment; performing anti-gravity mold filling; intercepting and releasing pressure; and solidifying. The method is stable in mold filling, less in slag inclusion, less in pinhole and high in feeding capacity; air holes and cold shut can be avoided, and the combustible atmosphere concentration can be effectively reduced; the universality is high, and the production efficiency, the stability and the safety are high.

The invention belongs to the technical field of welding equipment, particularly relates to multi-directional positioning type metal part welding equipment and method, and aims to solve the problems that the stability of a metal block is poor during welding and the welding effect of the metal block is reduced due to the fact that only one surface of the metal block can be positioned during welding and positioning of the metal block in the prior art. The welding workbench is fixedly connected to the upper portion of the welding tool frame, and a metal part body is placed on the upper portion of the welding workbench; the automatic welding gun body is arranged above the welding workbench; and the multi-direction positioning module is located above the welding workbench, and the multi-direction positioning module comprises a plurality of clamping tool frames. According to the multidirectional positioning type metal part welding equipment and method, positioning and clamping of multiple faces of the metal part body are achieved, the stability of the metal part body during welding is improved, and therefore the welding effect of the metal part body is improved.

The utility model relates to the field of metal wiring terminal production equipment, in particular to an automatic feeding and discharging type metal wiring terminal stamping die which comprises a bottom frame, an overturning pressure-bearing seat is rotationally installed on the bottom frame, a metal workpiece is borne on the overturning pressure-bearing seat through a lower die seat, and a punch used for stamping the metal workpiece is installed above the bottom frame. And after the overturning pressure-bearing seat is overturned, the processed metal workpiece can be popped out by utilizing the rotating rod to realize unloading. According to the stamping die, automatic feeding is achieved through the feeding barrel and the pushing piece, the metal workpiece is extruded through the cooperation of the extrusion plate, the feeding speed is high, and automatic positioning and fixing can be achieved. According to the utility model, the overturning pressure-bearing seat is matched with the rotating rod to realize automatic unloading of metal workpieces; the stamping push rod is used for pushing the push plate to move, so that stamping of the punch, overturning of the overturning pressure-bearing seat and ejection of a machined metal workpiece through the rotating rod can be achieved in sequence. Therefore, the equipment integration level is higher, and the use is safer and more reliable.

The invention relates to the technical field of metal separation in machining waste, in particular to magnetic type metal separation equipment which comprises a long groove, the long groove is formed in the surface of one side of a frame, a displacement frame is slidably connected into the long groove, a first motor is fixedly mounted on the surface of the vertical end of the displacement frame, and a gear is fixedly mounted at the output end of the first motor; a rack is fixedly installed on the surface of the frame, an electric telescopic rod is fixedly installed on the bottom surface of the top horizontal end of the displacement frame, a rotating shaft is rotationally connected between the inner walls of the two ends of the U-shaped plate, a magnetic roller is fixedly installed on the surface of the outer wall of the rotating shaft, a second motor is fixedly installed on the surface of one side of the U-shaped plate, and the output end of the second motor is fixedly connected with the rotating shaft. According to the invention, the problems of resource waste and resource utilization rate reduction caused by the fact that magnetic metal waste and other waste are directly treated together in the existing treatment mode are solved.

The invention relates to a high-pressure air separation liquid valve with a multi-stage low-temperature self-tightening sealing structure, which relates to the technical field of low-temperature high-pressure fluid control and comprises a valve body assembly, a multi-stage sealing assembly and a valve rod thermal compensation assembly. The multi-stage sealing assembly is arranged on the valve element in a stepped mode and comprises a primary metal hard sealing ring, a secondary modified PTFE sealing ring and a three-stage self-tightening type metal spring energy storage ring, and the main sealing function, the flexible compensation function and the pressure self-tightening function are achieved respectively. The valve rod thermal compensation assembly comprises a titanium alloy valve rod and a copper-nickel alloy thermal buffer sleeve, and the displacement of the sealing face is automatically compensated at the low temperature through the difference between a reserved gap and the thermal expansion coefficient of a material. Through multi-stage sealing cooperation and intelligent thermal compensation, the problem of sealing leakage caused by material failure and thermal deformation under the ultralow-temperature and high-pressure working conditions is effectively solved, all-working-condition reliable sealing is achieved, the safety of the valve in the extreme environment is remarkably improved, and the service life of the valve in the extreme environment is remarkably prolonged.

The utility model discloses a heating table for a special-shaped metal workpiece, which is provided with high-frequency heating equipment which is electrically connected with a heating coil, and is characterized in that the heating table comprises a supporting table which is positioned in front of the high-frequency heating equipment and below the heating coil; the upper portion of the supporting table is fixedly connected with a mounting plate through a fixing piece, the upper portion of the mounting plate is provided with a lifting mechanism, the lifting mechanism is connected with a connecting column, the connecting column is connected with a supporting column through a connecting piece, and the supporting column is located under the heating coil. According to the utility model, the clamp is used for clamping the special-shaped metal piece, the metal piece is arranged in the heating coil, the metal piece is contacted with the supporting column below the coil, and the supporting column generates acting force on the metal piece to support the metal piece, so that the force which is required by an arm is reduced, the physical power is saved, and the working intensity is reduced.

A refrigerating system with an anti-vibration copper pipe connecting structure belongs to the technical field of refrigerating systems and comprises an anti-vibration welding type metal plate frame, a compressor, an exhaust pipe, a condenser, a condensate pipe, an evaporator and an air suction pipe, the condenser is connected with the compressor through the exhaust pipe, and the exhaust pipe is arranged at an exhaust outlet of the compressor; the evaporator is connected with the condenser through a condensate pipe. The compressor is connected with the evaporator through an air suction pipe. A refrigerant sequentially flows to the condenser and the evaporator from the compressor and then returns to the compressor, so that a refrigerating system is formed; the exhaust pipe is an anti-vibration copper pipe, and the design of the anti-vibration copper pipe is as follows: a large arc of 360 degrees + alpha or 720 degrees + alpha is additionally arranged according to the flowing direction of a refrigerant to guide the flowing of the refrigerant; refrigerant flow resistance is reduced, and vibration of system exhaust is reduced; the periphery of the anti-vibration copper pipe is sleeved with a heat-resisting vibration-reducing sleeve in series before welding, so that the vibration-reducing effect is achieved; the exhaust pipe has the advantages of being small in vibration, low in noise and small in refrigerant flow resistance.