418 results about "Radial pressure" patented technology

The invention relates to the technical field of spinning machines, in particular to a spinning machine precision control method suitable for a high-temperature working condition, and the method comprises the following steps: collecting multi-source information; establishing a mapping relation between the thermal error and the temperature field to obtain a thermal error prediction model, training and correcting the thermal error prediction model, and outputting a real-time thermal error prediction value; generating a comprehensive position compensation instruction and performing position compensation; the pressure feedback value collected in real time is compared with a corresponding preset threshold value, if the pressure feedback value collected in real time is larger than or equal to the corresponding preset threshold value, the comprehensive position compensation instruction is converted into a force control instruction, and if the actual axial pressure feedback value or the actual radial pressure feedback value is smaller than the corresponding preset threshold value in the force control process, the comprehensive position compensation instruction is converted into the force control instruction. If yes, returning to the position compensation mode. According to the method provided by the invention, comprehensive compensation and active inhibition of thermally induced errors can be realized, and the forming precision of high-temperature spinning and the surface smoothness of a workpiece are remarkably improved.

The invention relates to the technical field of injection molding pressure control, in particular to a multi-stage pressure closed-loop compensation system and method for high-precision double-color injection molding, and the system comprises an interface gradient positioning module, a flow resistance state recognition module, a fitting function reconstruction module, a time sequence deviation triggering module and a gain reverse correction module. According to the method, the high-density measuring point data is collected, the interface radial pressure gradient change is extracted through the finite difference method, the stably-arranged nodes at the material intersection can be accurately locked, and the flow resistance state of the flow channel is judged according to the slope difference value of the screw speed and the pressure intensity change. A linear boosting or index slow increasing strategy is automatically switched to reconstruct a pressure function form, local high-pressure accumulation characteristics of a product sensitive area are accurately matched, the coincidence degree of a time window drift trend and a slope sudden change window is monitored, historical displacement and pressure errors are converted into backstepping factors through an iterative learning model, and the backstepping factors are calculated. And a driving gain curve is initialized and revised, so that forming deviation caused by thermal drift of equipment is eliminated.

The invention belongs to the technical field of pipeline inner wall cleaning, and particularly relates to a self-adaptive pipe diameter adjusting type petroleum oil pipe intelligent cleaning robot which comprises a shell, and the shell is composed of a left shell body and a right shell body which are the same in structure. According to the supporting mechanism, a bidirectional threaded rod linkage structure hinged through a universal joint is adopted, and an electromagnetic cylinder and a moving block are matched to cooperatively control supporting legs to stretch out and draw back dynamically, so that the device is adaptive to different pipe diameters and bent pipe forms, and the device can be stably attached in a round pipe, an oval pipe or a bent pipe; the driving mechanism is based on bevel gear transmission and is combined with a radial pressure compensation mechanism to realize the multidirectional moving capability of vertical climbing and horizontal propelling; the exploration mechanism is integrated with a two-degree-of-freedom holder, and the cleaning process is monitored in real time through axial looking and radial pitching scanning in cooperation with self-adaptive light supplement; the cleaning mechanism innovatively integrates a rotary cutting drill bit, an adjustable blade set and a high-speed brush roller, the operation radius is dynamically adjusted through an extension rod, and stubborn scaling crushing, pipe wall scraping and chipping sweeping are synchronously completed.

The invention relates to the technical field of oil product detection, in particular to a full-automatic condensation point determinator and a determination method.The full-automatic condensation point determinator comprises a base and a test tube, the top of the base is fixedly connected with a mounting base, the surface of the base and the surface of the mounting base are provided with a test bath mechanism and a supporting mechanism, and the test bath mechanism enables a motor to drive a test bath to rotate; the rotation angle of the motor is controlled through a preset program, precise positioning is achieved, the tedious operation of hole-by-hole adjustment of the original structure is avoided, the rotating shaft is locked through mechanical clamping, angle deviation in the testing process is prevented, then manual adjustment is replaced by the motor and the electric push rod, and the test efficiency is improved. The double locking effect is achieved, accidental displacement can be prevented, and precision and efficiency are improved; according to the clamping mechanism, the four arc-shaped clamping plates apply uniform radial pressure through the first springs to clamp the outer wall of the test tube, the inner diameters of the clamping plates are gradually increased from top to bottom, and the clamping mechanism is compatible with test tubes with different outer diameters.

The invention discloses a test system applied to performance testing of a high-pressure cold helium solenoid valve, and relates to the field of low-temperature fluid engineering. According to a method, a multi-dimensional radial pressure difference sampling point is arranged in a cold helium channel of the solenoid valve, and a high-frequency sampling MEMS pressure sensor and a speed inversion algorithm are combined; the system can calculate the velocity component V (x, r, t) and the rotation delta * V (x, r, t) of the radial r position of the valve body at the x position in the cold helium flowing direction at the t moment in real time, and construct a local disturbance spectrum energy density function Md based on the disturbance weighting function N (x, r) of the radial r position of the valve body at the x position in the cold helium flowing direction. The method not only breaks through the technical limitation that only the total flow velocity of cold helium is monitored in the prior art, but also can realize real-time discrimination of the disturbance level by constructing the disturbance interval threshold, provides a reliable basis for subsequent adjustment decision, and effectively improves the early sensing ability of the test system to local flow state abnormity.

The present invention relates to a coaxial cable processing device and a method for processing a coaxial cable. The coaxial cable processing device has a first clamping member provided with a first clamping part; a second clamping member provided with a second clamping part which is opposite to the first clamping part; and a first driving device configured to drive the first clamping member and / or the second clamping member to make the first clamping part and the second clamping part move towards or away from each other in a straight line. When the first clamping member and the second clamping member move towards each other and clamp a shielding layer of a coaxial cable, the first clamping part and the second clamping part respectively surround a part of the coaxial cable in a circumferential direction and apply radial pressure on the shielding layer to flare it. The coaxial cable processing device of the present invention can replace manual operation and has high degree of automation.

A surrounding rock deformation and failure test system with a rotatable stress main shaft in a three-dimensional crustal stress field is characterized in that a press machine upper pressure head and a press machine base are oppositely distributed up and down, and a loading hydraulic cylinder is connected with the press machine upper pressure head; the surrounding rock sample is vertically arranged in the axial loading space, and a simulation roadway is formed in the axis part of the surrounding rock sample; annular upper and lower end plates are fixedly connected in the upper and lower ends of the confining pressure cylinder respectively; the confining pressure cylinder sleeves the outer side of the axial loading space; a plurality of groups of mounting holes are uniformly formed in the circumferential directions of the annular upper and lower end plates; the radial pressurizing assembly comprises a supporting steel pipe and an elastic capsule. The main supporting section is sleeved with the elastic capsule, and a plurality of through holes are formed in the main supporting section. A plurality of strain bricks are pre-buried in the surrounding rock sample; the track is fixedly mounted in the simulated roadway; the micro camera is assembled on the track through the electric control trolley; and the strain gauge II and the acoustic emission probe are arranged in the simulated roadway. According to the system, the working condition that the direction of a stress field changes can be simulated in a three-dimensional true triaxial stress environment.

The invention discloses a screw locking structure with a spring tip cone, which comprises a screw which penetrates through a first connected piece and then is in threaded connection with a second connected piece, the lower section of the screw is a locking section, the locking section is in threaded connection with the second connected piece, the locking section is provided with a first taper hole, and the spring tip cone is arranged in the first taper hole. A convex cone matched with the first conical hole is arranged in the threaded hole of the second connected piece, the smaller end of the convex cone faces the head of the screw, a spring is fixed to the larger end of the convex cone and connected with the second connected piece, gaps are formed in the hole wall of the first conical hole and distributed in the axial direction of the screw, and one end of each gap extends to the bottom of the screw. Compared with the prior art, the structure is simple, the convex cone is sleeved with the first conical hole and downwards extrudes the spring, the convex cone opens the locking section so as to increase radial pressure, and the external thread of the locking section tightly holds the internal thread of the second connected piece so as to achieve the anti-loosening effect; the spring can apply axial force to the screw through the convex cone to increase the pre-tightening force of the screw so as to achieve looseness prevention.

The invention discloses a superconductive strip turn-to-turn conductivity measurement method and system, and belongs to the technical field of superconductive material conductivity measurement. The voltage of the turn-to-turn contact part is measured by increasing the injection current from 0A to 50A at the rate of 1A / s, and the turn-to-turn contact resistance is deduced by fitting the slope of a U-I characteristic curve, so that the calculation precision of the turning contact resistance is improved, and errors caused by electrical noise are reduced; the obtained inter-turn contact resistance is averaged and divided by the contact area, the inter-turn contact conductivity is obtained, errors caused by strip sample differences are reduced, and the accuracy of inter-turn contact resistivity calculation can also be improved through a slope fitting method. The correlation between the radial pressure and the contact conductivity is established according to the change condition of the turn-to-turn electric shock conductivity along with the stress, and the contact conductivity of the superconducting tape under different stresses can be accurately measured.

The invention provides a friction and wear test device suitable for shaft seats of multiple specifications and a use method. The device comprises a test table board, an assembly type clamp, a crank-link mechanism and an oil cylinder loading system, the assembly type clamp is arranged on the test bench surface and is used for clamping the dual shaft; the dual shaft is used for mounting a shaft seat tested piece; the assembly type clamp comprises an inner side bearing base and an outer side bearing base which are both movably installed on the test bench surface. The dual shaft is rotationally connected with the crank connecting rod mechanism, so that the swing friction test of the dual shaft in the shaft seat tested piece is realized; and the oil cylinder loading system is arranged below the shaft seat tested piece and is used for providing radial pressure for the shaft seat tested piece. The distance between the inner bearing base and the outer bearing base can be adjusted through the inner bearing base and the outer bearing base which are movably mounted on the test bench surface, so that the device adapts to shaft seats with different lengths and is used for friction and wear tests of shaft seats with multiple specifications.

The utility model discloses a step-up gear box shaft seal which comprises a gear box cover and a rotating shaft, a sealing groove is integrally formed in one side of the gear box cover, the gear box cover is rotationally connected with a main threaded rod located above the sealing groove in a penetrating mode, and the rotating shaft is rotationally connected with the middle of the sealing groove in a penetrating mode. And an elastic sealing ring is arranged in the sealing groove, a pressing ring which abuts against and makes contact with the elastic sealing ring is arranged in the sealing groove, the other side of the pressing ring is integrally connected with a connecting claw, and the tail end of the connecting claw is connected with the main threaded rod in a penetrating and threaded mode. The sealing groove is formed, the rotating shaft is sleeved with the elastic sealing ring, the main threaded rod is rotated, the connecting claw pushes the pressing ring to abut against the elastic sealing ring, the sealing effect is improved, the radial pressure of the elastic sealing ring and the rotating shaft is kept constant, a traditional shaft sealing structure is reserved, and the rotating resistance of the rotating shaft is reduced.

The sealing device comprises a first sealing assembly and a second sealing assembly, the first sealing assembly is arranged at the end, away from a gun head, of an inner cavity, the first sealing assembly comprises a sealing lantern ring, a first pressing plate and a first sealing ring, the sealing lantern ring is embedded in the inner cavity, and the first pressing plate is arranged on the first sealing ring. The first pressing plate is partially embedded in the inner cavity and abuts against the sealing lantern ring, the sealing lantern ring is in interference fit with the outer diameter of the piston rod, and the first sealing ring is arranged on the outer wall of the sealing lantern ring in a sleeving mode so as to apply radial pressing force to the sealing lantern ring; the second sealing assembly is arranged at the joint of the cylinder body and the gun head and comprises a second sealing ring, a second pressing plate and a push plate, the gun head is sleeved with the second sealing ring, the second pressing plate is embedded in the cylinder body and presses the gun head, and the push plate is connected to the cylinder body so as to press the second pressing plate. According to the technical scheme, the sealing effect and durability of the pipettor are improved.

The invention relates to the field of in-situ leaching mine production, and provides a horizontal well washing simulation experiment device which comprises an ore bed simulation system used for simulating an ore bed environment and comprising a box body, the top of the box body is of an open structure, the box body is filled with ore bed rock powder to construct a simulation rock stratum, and a plurality of injection connectors are formed in the side wall of the box body; the impact force testing system is buried in the simulated rock stratum and comprises a self-advancing force and axial pressure testing device, a radial pressure testing device and a bent connecting pipe, the self-advancing force and axial pressure testing device and the radial pressure testing device are connected through a screen pipe, and the first end of the bent connecting pipe extends into the rock stratum to be connected with the jet radial pressure testing device; the second end penetrates out of the open structure of the box body; and the sand washing well washing system is detachably arranged in the bent pipe in a penetrating manner and is used for being connected with the well washing impact force testing system so as to carry out jet flow well washing, air well washing and liquid pumping simulation experiments. The in-situ leaching uranium mining production environment can be reduced, and evaluation of various well washing tools is achieved.

The invention relates to the technical field of ultrafiltration, in particular to a peristaltic pump for liquid ultrafiltration and an ultrafiltration process. The device comprises a supporting base, a movable plate, a mounting base, an overturning assembly, a rotation adjusting assembly and a supporting assembly. The device has the beneficial effects that the mounting seat is overturned through the overturning assembly, so that the curved surface of the mounting seat is far away from the supporting base, then the included angle between the movable plate and the supporting base is adjusted to be 90 degrees by rotating the adjusting assembly, and at the moment, the mounting seat can be mounted on curved surface equipment through the mounting hole; the adjusting assembly is rotated to adjust the included angle between the movable plate and the supporting base to be the inclination angle of to-be-installed slope equipment, the installation base can be installed on the slope equipment through the installation hole, it is guaranteed that the peristaltic pump body is in the horizontal working condition all the time, and the pump body is prevented from being deformed when installed on the curved surface / slope equipment; and the radial pressure imbalance of the roller on the hose under the non-horizontal working condition is prevented.

The utility model discloses a split type journal sticking device which comprises an outer sleeve assembly, a middle sleeve assembly and an inner sleeve assembly, the outer sleeve assembly, the middle sleeve assembly and the inner sleeve assembly are all of split type structures, and two outer conical surfaces are symmetrically arranged on the outer side of the inner sleeve assembly. An annular wedge-shaped space is formed between the inner side of the outer sleeve assembly and the outer conical surface on the outer side of the inner sleeve assembly, the middle sleeve assembly is arranged in the annular wedge-shaped space, and an inner conical surface matched with the outer conical surface is arranged on the inner side of the middle sleeve assembly; and a pushing mechanism is arranged between one end of the middle sleeve assembly and the outer sleeve assembly. The middle sleeve assembly is pushed to move through the pushing mechanism, huge radial pressure is applied to the inner sleeve assembly under the action of the outer conical surface and the inner conical surface, the inner sleeve assembly firmly holds the transmission shaft under the huge radial pressure, and compared with a traditional bolt fastening mode, the clamping force is greatly improved, and the transmission shaft can be firmly clamped. The problem that the shaft sticking device and the transmission shaft are prone to slipping is effectively solved.

The invention relates to the technical field of PVC pipe detection, in particular to a PVC pipe compression resistance detection device which comprises a detection machine table, a lifting plate is slidably connected to the detection machine table, a pressure applying plate is installed on the lifting plate, a trigger plate is installed on the lower side of the pressure applying plate, and a bearing table used for bearing a plastic pipe is fixedly arranged on the detection machine table. A supporting rod is fixedly connected to the detection machine table, a contraction plate is connected to the supporting rod in a sliding mode, a lower spring is further arranged on the supporting rod in a sleeving mode, a positioning seat is fixedly connected to the contraction plate, the positioning seat upwards penetrates through a contraction hole in the bearing table, and a positioning rod used for limiting the plastic pipe is installed on the positioning seat. According to the device, the plastic pipe can be limited before detection, the plastic pipe is prevented from rolling during placement, the plastic pipe can be accurately placed in the middle position, the limiting of the plastic pipe can be canceled in time when detection is started, the natural change rule of the plastic pipe in the radial compression state is prevented from being influenced, and the detection accuracy is improved. And the accuracy of detection data is ensured.

The invention provides an expansive force anisotropy testing device for bentonite construction joint self-healing, and belongs to the technical field of testing devices.The expansive force anisotropy testing device comprises a base, a sample cavity is formed in the upper surface of the base, an embedding groove is formed in the upper surface of the sample cavity and covered with an acrylic transparent plate, the embedding groove is used for containing a sample, and a permeable stone is embedded into the bottom of the embedding groove; the permeable stone pipeline is connected with a volume / pressure controller, an axial pressure sensor used for measuring the axial expansive force of the sample is arranged between the base and the sample cavity, a radial pressure sensor connected with the sample and used for measuring the radial expansive force of the sample is arranged on the side edge of the sample cavity, and an image acquisition module connected with a terminal is erected above the sample. The system is used for recording sample expansion deformation and construction joint healing process in real time. According to the invention, the real-time visual recording of the bentonite expansion process is realized, the sensor layout is optimized, the association mechanism of the expansion force time history curve and the seam self-healing process is clarified, and the data acquisition precision and the test efficiency are improved.

A clearing head 10 includes annular scraper edge 12 and rows of openings 14, 16. A clearing tool 100 has a one-piece combined shaft 24 and clearing head 10. Wiper ring 49 includes inner first material 49a around an opening 49c for the shaft 24. The first material may have molybdenum / molybdenum disulphide. A resilient second material 49b is provided around the first material. The resilient second material is or includes FKM. In a ram 38, the resilient second material can exert inward radial pressure to the first material by reacting against a ram interior wall 39. The ram can incline from horizontal and vertical by an angle a e.g. between at least 10° and 80°, or between at least 20° and 70°, or between at least 30° and 60°, or between at least 25° and 45°, or around 30°.

The application belongs to the technical field of power aviation, and particularly relates to a connecting-separating device structure for a rocket-boosted glider, which comprises a connecting piece I, a connecting piece II and a sliding assembly. The connecting piece I is provided with a fixed limiting plate. The sliding assembly comprises a sliding limiting plate, a bolt and a driving assembly. The connecting piece II is provided with a connecting plate. The connecting plate is provided with a insertion hole. The axis of the bolt and the insertion hole is perpendicular to the axis of the rocket. The fixed limiting plate and the sliding limiting plate can be relatively close to each other, the connecting plate can be prevented from moving along the axis of the bolt, the two can provide clamping force to limit and fix the connecting plate, the radial pressure between the bolt and the insertion hole is reduced, and the possibility of being stuck or even self-locked is reduced. When being separated, the sliding limiting plate is away from the fixed limiting plate, the moving range of the connecting plate during separation is enlarged, the possibility of the connecting plate colliding with the connecting piece I and the sliding assembly during separation is reduced, and the success rate of separation is improved.

The application relates to the technical field of oil product detection, in particular to a full-automatic condensation point tester and a determination method, which comprises a base and a test tube, the top of the base is fixedly connected with a mounting seat, the surface of the base and the mounting seat is provided with a test bath mechanism and a supporting mechanism, the test bath mechanism enables the test tube placed in the test bath mechanism to be adjusted at multiple angles by rotating the test bath driven by a motor, replaces the original manual bolt structure, controls the rotating angle of the motor through a preset program, realizes accurate positioning, avoids the complicated operation of adjusting each hole in the original structure, prevents the angle from deviating during the test by mechanically clamping and locking the rotating shaft, and then the motor and the electric push rod replace manual adjustment, realize double locking effect, can prevent accidental displacement, and improve the accuracy and efficiency; the clamping mechanism enables four arc-shaped clamping plates to exert uniform radial pressure on the outer wall of the test tube through the first spring, the inner diameter of the clamping plate is designed to gradually increase from top to bottom, and different outer diameter test tubes are compatible.

The invention discloses a sighting telescope shell die-casting mold and a method thereof, and belongs to the technical field of metal die-casting molds, the sighting telescope shell die-casting mold comprises a base, a lower mold and an upper mold are arranged in the base, a mandrel is further arranged in the base, a motor and an air cylinder are arranged on the side wall of the base, and the output end of the motor is fixedly connected with one end of the mandrel; the other end of the mandrel is connected with the telescopic end of the air cylinder, and a vibration mechanism is arranged in the mandrel. During die casting, centrifugal force generated by rotation of the mandrel drives the stroke radial pressure gradient of the molten metal, bubbles are promoted to be gathered towards the center of the mandrel and discharged through a vacuum system, the porosity is reduced, meanwhile, shearing force generated by rotation of the mandrel and the molten metal can reduce the interdendritic crystal shrinkage porosity defect, and the yield is improved. And therefore, internal pores caused by insufficient feeding of the inner wall area are reduced, the problem of insufficient casting of the far end caused by overlong flow in traditional die casting is solved, the product forming is more complete and uniform, and the overall die casting quality is improved.

The utility model discloses a pressure-resistant sealing assembly of a bridge plug, and particularly relates to the technical field of bridge plug sealing. The protection part comprises an outer rubber barrel arranged outside the bridge plug in a sleeving mode and two fixing barrels, the two fixing barrels are arranged at the top end and the bottom end of the outer rubber barrel correspondingly, and multiple sets of positioning parts used for enhancing stability are arranged on the sides, close to the outer rubber barrel, of the fixing barrels; each group of positioning pieces comprises a positioning hole, the positioning hole is formed in one side, close to the outer rubber barrel, of the fixing barrel, and a touch plate is rotationally connected into the positioning hole. According to the utility model, the contact plate is rotationally connected with the fixed cylinder, so that when the contact plate and the outer top ring do relative motion, the contact plate drives the pressing plate to be in contact with the outer rubber cylinder, the pressing plate can apply an extrusion force from outside to inside to the outer rubber cylinder, and the outer rubber cylinder can be synchronously subjected to radial pressure and longitudinal pressure by virtue of fixed limiting of the limiting ring seat; therefore, the stability and the sealing performance of the outer rubber sleeve are enhanced.

The invention discloses a motor rotor magnetic shoe surface mounting tool and a surface mounting method thereof and a motor assembly production line, and the tool comprises a rotor housing mold ring, the inner side wall of which is provided with a magnetic shoe supporting structure in a matched manner, so as to form a plurality of magnetic shoe mounting positions for mounting magnetic shoes in the inner circumferential direction of the rotor housing mold ring, the limiting piece of the magnetic shoe supporting structure is arranged between the adjacent magnetic shoe mounting positions; the magnetic shoe auxiliary pressure maintaining device is configured to be detachably mounted in the rotor shell mold ring through a rotating shaft of the rotor shell mold ring; the edge of the magnetic shoe auxiliary pressure-maintaining device is circumferentially provided with a pressure-maintaining assembly corresponding to the installation position of the magnetic shoe, and the pressure-maintaining assembly is used for applying radial pressure to the magnetic shoe, so that the magnetic shoe is tightly attached to the inner side wall of the rotor housing die ring through a bonding layer between the magnetic shoe and the pressure-maintaining assembly. Therefore, the uniform gap between the adjacent magnetic shoes is standardized through the limiting piece and the pressure maintaining assembly, displacement caused by magnetism in the surface mounting process of the magnetic shoes is avoided, the magnetic shoe gap is stably maintained, the consistency of the magnetic shoe gap is guaranteed, and the adjacent magnetic shoes are prevented from being attracted and collided due to magnetism.

The utility model discloses a lens bearing turntable, and relates to the technical field of lens processing. The lens bearing turntable comprises a base and a turntable body, a control motor is arranged in the middle of the interior of the base, a rotating shaft is arranged at the top of the control motor, an electromagnetic chuck is fixedly connected to the top end of the rotating shaft, a magnetic plate is fixedly connected to the lower surface of the turntable body, and a positioning part is arranged in the middle of the lower surface of the turntable body; according to the utility model, the electromagnetic adsorption technology is used for replacing mechanical fixation, so that the disassembly and assembly process is simplified, the maintenance time is obviously shortened, the manual operation intensity is reduced, the labor intensity is reduced, the production efficiency is improved, and the production cost is reduced. And through the adaptive structure of the balls and the annular guide grooves, when the electromagnetic chuck rotates, the balls roll along the guide grooves to form multi-point support, and the radial pressure borne by the rotating shaft is greatly dispersed.

The invention relates to the technical field of mechanical property test equipment, in particular to a confining pressure device used in a Hopkinson test, comprising: an equipment box provided with a confining pressure groove; the confining pressure assembly comprises a hydraulic mechanism and an elastic confining pressure mechanism; the mechanical pressure equalizing assembly comprises a mechanical limiting mechanism and a locking mechanism; the self-compensation sealing assembly comprises a movable sealing mechanism and a follow-up pressing mechanism; through cooperative work of the hydraulic mechanism, the elastic confining pressure mechanism and the mechanical pressure equalizing mechanism, the large-range pressure adjusting capacity is guaranteed, pressure fluctuation is buffered through an elastic element, uniform and stable application of radial pressure of a test piece is achieved, the mechanical limiting mechanism is locked by the locking mechanism in the test process, mechanism displacement caused by impact vibration is eliminated, and the test efficiency is improved. The pressure field space distribution is ensured to be constant; a movable sealing mechanism and a follow-up pressing mechanism in the self-compensation sealing assembly dynamically adjust the sealing force, and the leakage problem caused by abrasion of a sealing piece is effectively solved.

The invention relates to the technical field of laser cutting, in particular to a cutting device for instrument manufacturing, which comprises a mounting frame, a portal frame erected in the middle of the mounting frame and a laser cutting device arranged on the portal frame, and an inner fixing assembly is arranged at one end of the mounting frame; the inner fixing assembly comprises a rotary installation part, a telescopic rod and a plurality of inner supporting strips, the rotary installation part is fixedly installed on the installation frame, the telescopic rod is fixedly connected to the rotary installation part, the telescopic rod is divided into a telescopic section and a fixed section, and the inner supporting strips are annularly and fixedly connected between the telescopic section and the fixed section; an inner supporting assembly is arranged at the front end of the telescopic rod and is in an umbrella shape, and the outer edge of the inner supporting assembly is used for supporting the machined pipe fitting from the interior. Concentrated clamping force is converted into evenly-distributed radial pressure, the problems of indentation, ovalization deformation and the like caused by traditional outer clamping are fundamentally solved, and the clamping device is particularly suitable for machining of thin-wall and precise pipe fittings.

This invention provides a pressure testing device for vanadium redox flow batteries, relating to the field of flow energy storage testing equipment. It employs a push-pull sleeve and a threaded gas delivery pipe, with a compression ring and an expansion sleeve installed between the ends of the sleeve and the pipe. Rotating the push-pull sleeve causes it to move axially along the gas delivery pipe, driving a retaining ring to push the compression ring towards the expansion sleeve. The conical surface of the compression ring penetrates the expansion sleeve, applying radial pressure to cause it to expand outwards and tightly adhere to the inner wall of the tested pipe, forming a sealed structure. This eliminates the need for complex connections such as threads or plugs, achieving rapid sealing through mechanical deformation. A quick-connect fitting connects to a gas source, a control valve regulates the pressure, and a pressure gauge monitors the pressure inside the pipe, enabling sealing tests. Sectional testing can be performed without fully installing the pipeline system, avoiding the need for segmented troubleshooting after a leak and shortening testing time.

The utility model discloses a non-equal-pitch periodic alternating thread connection pair which is composed of a plurality of minimum period connection pair structures. The minimum period connecting pair structure is composed of a standard thread side and a non-equidistant periodic alternating thread side; by means of the thread pitch structure which changes alternately, radial pressure between threads is increased statically, and the anti-loosening capacity of a thread pair is improved. And an energy transfer path is more efficiently interfered under a dynamic load, and energy dispersion and offset are realized, so that a loosening mechanism is more thoroughly blocked.

The utility model provides a conical roller transmission system of an axial and radial ring rolling mill, which relates to the technical field of ring rolling mills and comprises a main body mechanism, a lower conical roller mechanism and an upper conical roller mechanism are arranged in the main body mechanism, the main body mechanism comprises a side block, a mounting plate is arranged at the top end of the side block, and a conical roller is arranged on the mounting plate. Fixing plates are fixedly mounted on the inner walls of the side blocks, the adjusting precision and operation stability of the conical rollers are improved, axial fine adjustment of the lower conical roller is achieved through the linkage design of a hydraulic cylinder A and a threaded rod, and the axial displacement deviation of the conical rollers can be effectively controlled in combination with guide constraint of a limiting rod and a sliding groove; a hydraulic cylinder B is adopted for driving a linkage locking mechanism of a convex block B and a clamping rod to be matched with the buffering design of a soft cushion B, so that uniform application of radial pressure is guaranteed, rigid impact among components is reduced, the disassembly and assembly process of the conical rollers is simplified through sliding fit of a limiting block and a limiting plate and modular design of a baffle and a pull block, and the maintenance difficulty is reduced.

The utility model discloses a porcelain bushing type outdoor terminal capable of preventing radial pressure deformation, and relates to the technical field of porcelain bushing type outdoor terminals, the porcelain bushing type outdoor terminal comprises a porcelain bushing body, the bottom end of the porcelain bushing body is fixedly provided with a supporting assembly, the supporting assembly comprises a mounting plate and a pre-tightening sleeve, the top end of the mounting plate is fixedly provided with a second top ring, and the pre-tightening sleeve is fixedly provided with a second top ring. At least two insertion rods are fixedly installed at the top end of the second top ring, a first top ring is fixedly installed at the top end of the installation plate, the heat dissipation area can be increased through the corrugated design of the surface of the porcelain bushing body, the heat dissipation efficiency can be improved, overheating can be prevented, and meanwhile the cable conductor, the semi-conductive belt and the first waterproof belt are installed in the porcelain bushing body. The internal conductive part is usually made of copper or aluminum, the conductive performance is excellent, the conductor is connected with a high-voltage power supply and a load, current is transmitted in the operation process, meanwhile, the porcelain sleeve ensures that the porcelain sleeve is subjected to good insulation protection, and current leakage is prevented.