1049 results about "Back-up ring" patented technology

According to the powder forming hydraulic machine, a servo motor and an automatic control system are arranged, a gear disc is in transmission connection with the servo motor through a gear, the automatic control system can control the precision of vertical rotation of the gear disc, and therefore the precision of material adding and reducing of the hydraulic machine is guaranteed while automatic material adding and reducing are achieved through the hydraulic machine; the supporting rings are two opposite semicircular steel rings, the supporting rings are located in the circular grooves formed in the inner ring of the gear disc, the gear disc can move up and down to drive the supporting rings to move up and down, when the lower pressing head needs to be replaced, only the two semicircular supporting rings of the supporting rings need to be detached, then the core rod is removed, the lower pressing head can be separated from the female die plate, and the replacement time of the lower pressing head is shortened.

The invention relates to the technical field of water conservancy project cofferdam construction, and discloses a cofferdam backfill supporting device which comprises a filler pipeline, a guide part is arranged on the filler pipeline, a positioning groove is formed in the outer wall of the filler pipeline, a supporting part is arranged on the filler pipeline, and the supporting part comprises a first supporting ring and a second supporting ring. The first supporting ring is slidably connected with the outer wall of the filling pipeline, a support is fixedly connected between the first supporting ring and the second supporting ring, a positioning part is arranged on the support and comprises a rod sleeve, and the rod sleeve is fixedly connected to the support. The guiding part and the supporting part are matched to avoid inclination and deviation of the pipeline, the positioning part and the calibration part are matched to improve the hole site calibration precision, the limiting part achieves conflict-free switching between the calibration part and backfill material injection, finally it is guaranteed that backfill materials are evenly filled, the problems of scattering and cavities do not exist, and the requirements for cofferdam impermeability and structural stability are met.

The invention relates to the technical field of pipeline welding, in particular to a thermal power plant pipeline system circumferential welding device which comprises a positioning and clamping set used for fixing a pipeline and further comprises a position adjusting set which is arranged on one side of the positioning and clamping set and comprises a movable sliding block. And a mounting seat is mounted at the upper end of the sliding block through a plurality of spring telescopic rods. By means of the alignment welding set and the guide reserving sets evenly distributed in the circumferential direction, the moving pipelines can be automatically guided, self-adaptive fine adjustment can be provided in the butt joint process of the two pipelines, the coaxiality can be fed back in real time, it is ensured that the ends of the two pipelines and the supporting ring are coaxially distributed, manual repeated calibration is not needed, and the production efficiency is improved. And in addition, the width of the welding seam between the two pipelines can be determined in the one-time alignment process, a feeler gauge does not need to be used for repeatedly detecting and adjusting the distance between the pipelines, and the pipeline welding efficiency is improved.

The invention relates to the technical field of pipe cutting, and discloses a metal pipe cutting device which comprises a cutting table, and a cutting machine, a first supporting ring and a second supporting ring are sequentially arranged on the top face of the cutting table. Wherein the first supporting ring is fixedly connected to the top face of the cutting table, a first supporting assembly is arranged on the inner ring side of the first supporting ring, and the supporting end of the first supporting assembly makes rolling contact with the pipe so that the pipe can be connected with the first supporting ring in a sliding mode and fixed to the axis of the first supporting ring; the second supporting ring is slidably connected with the cutting table, a second supporting assembly is arranged on the inner ring side of the second supporting ring and comprises a supporting plate connected with the pipe so that the pipe can be fixed relative to the second supporting ring, a driving unit is arranged on the second supporting ring, and the driving end of the driving unit is connected with the supporting plate. The supporting plate moves in the axial direction of the pipe fitting and is used for enabling the pipe fitting to stretch out of the second supporting ring in the axial direction. The cutting efficiency and effect of the metal pipe can be improved, and the utilization rate of cut tailings is increased.

The invention relates to the field of bearings, in particular to a tapered roller bearing machining device and a machining process thereof. The machining device comprises a supporting ring, the cross section of the supporting ring is in an L shape, a plurality of protruding strips are annularly arranged on the supporting ring, when the bearing is machined, the supporting ring is placed in a horizontal state, an inner ring is placed on the protruding strips, the inner ring is sleeved with an isolation frame, and then the supporting ring supports the isolation frame; at the moment, a plurality of tapered rollers are placed in a plurality of through holes in the isolation frame, the tapered rollers are inserted into the tapered roller path, the outer edge of the supporting ring supports the tapered rollers, and then the outer ring is buckled on the outer sides of the tapered rollers, so that the tapered roller bearing is convenient to assemble and machine. Assembling and machining of a plurality of tapered rollers in the tapered roller bearing are facilitated, and the tapered rollers are prevented from falling off during assembling.

Provided is a welding device for machining, comprising a frame (1), clamping mechanisms (2), a support ring (3), an angle adjustment mechanism (4), an electric telescopic rod (5), a connecting frame (6) and a welding machine (7). One clamping mechanism (2) is mounted on each of the left and right sides of the frame (1); the support ring (3) is arranged in the frame (1); the angle adjustment mechanism (4) is mounted on the support ring (3); the angle adjustment mechanism (4) comprises: a driving motor (401), a pinion (402), a large gear (403) and an extension plate (404), wherein the driving motor (401) is fixed to a connecting plate (301), the pinion (402) is mounted on an output shaft of the driving motor (401), the large gear (403) meshing with the pinion (402) is mounted on the lower side of the pinion (402), the extension plate (404) is fixed to the front side of the large gear (403), and the electric telescopic rod (5) is mounted on the extension plate (404); an output end of the electric telescopic rod (5) is fixed to the connecting frame (6); the welding machine (7) is mounted in the frame (1); and a welding head (701) is connected to the welding machine (7). The welding device is convenient to use, and facilitates annular welding of a circular pipeline.

The utility model relates to the technical field of cable installation and arrangement, and discloses a single-core indoor and outdoor cold shrinkage terminal head, which comprises an insulating tube, a supporting core rope is arranged in the middle of the insulating tube, a sealing ring is fixedly connected to the periphery of the insulating tube, a rubber sleeve is fixedly connected to the middle of the sealing ring, a sleeve is fixedly connected to the middle of the insulating tube, and the rubber sleeve is fixedly connected to the middle of the sleeve. A sealing film is fixedly connected to the middle of the sleeve, a sliding pipe is connected to the middle of the sleeve in a sliding mode, a clamping assembly is installed in the middle of the sleeve and comprises a supporting clamping ring, and the supporting clamping ring is fixedly connected to the middle of the sleeve. According to the utility model, firstly, the insulating tube is sleeved on the cable joint, and after the supporting core rope is pulled and drawn away, the rubber sleeve is pressed, so that the supporting ring is pushed, the sliding tube on the supporting ring can be inserted into the sleeve and the sealing film is punctured, and then the stability and the service life of the cold shrink terminal after installation are ensured under the filling and adhesion of glue.

The utility model discloses a demolding structure for injection molding of a plastic product, and relates to the technical field. The device comprises an injection molding structure which comprises a base, a mounting frame fixedly arranged on one side above the base, a hydraulic rod I fixedly arranged in the mounting frame, an upper mold positioned at the telescopic end of the hydraulic rod I, an injection molding pipe communicated with the upper mold, a supporting pipe rotationally arranged in the base in a penetrating manner, and a lower mold distributed at the upper end of a turntable; and; a demoulding structure, comprising a second hydraulic rod, a push plate located at the telescopic end of the second hydraulic rod, a stroke opening formed in a lower die and a rotary disc, an ejector block located in the stroke opening, an ejector rod located at the lower end of the ejector block, a semicircular cover fixedly arranged at the upper end of a base, a supporting ring connected to the outer wall of the ejector rod in a sleeving mode, an ejector ring connected to the outer side of the ejector rod in a sleeving mode, and a spring fixedly arranged between the ejector ring and the supporting ring. According to the utility model, the demoulding structure is arranged, so that the problems that the injection mould cannot be used when demoulding is carried out after mould opening, and the processing efficiency of an injection-molded part is reduced are solved.

The invention discloses a sound insulation and noise reduction water supply and drainage pipeline, and belongs to the technical field of water supply and drainage pipelines, the sound insulation and noise reduction water supply and drainage pipeline comprises a pipeline body and a connecting mechanism, the pipeline body comprises an outer pipe body, an inner pipe body, a supporting ring and a sealing ring, and an exhaust mechanism is arranged at the top of the outer pipe body and comprises an exhaust pipe, a sealing cover and a one-way valve; the two ends of the outer side of the outer pipe body are fixedly sleeved with fixing rings. The connecting mechanism comprises a front connecting base, a rear connecting base, a connecting frame, a fixing frame and a plug pin. The interlayer space between the inner pipe body and the outer pipe body is vacuumized and reliably sealed, the transmission path of sound in the structure is effectively cut off, outward transmission of noise generated by water flow in the pipe and vibration of the pipe is remarkably blocked in the vacuum state, and the overall sound insulation performance is greatly improved; the core measure is supplemented with the design of the supporting ring and the elastic sealing ring, vibration buffering is provided at a key connecting point, energy is absorbed and dissipated, and excellent environmental noise control is comprehensively achieved.

The utility model relates to a regulating valve for an ultrahigh-pressure polyethylene device, which comprises a filler assembly, a main sealing filler group, an inner auxiliary sealing filler group and an outer auxiliary sealing filler group, the main sealing packing set is provided with inverted-V-shaped supporting rings and PTFE sealing rings which are alternately arranged. A first cavity is formed between the supporting ring and the teflon sealing ring; the inner auxiliary sealing packing group is provided with a C-shaped ring with a downward opening; the outer auxiliary sealing filler set is provided with an upper filler, a plurality of middle fillers which are overlapped and are in an inverted V shape are arranged between the lower filler and the upper filler, and a second cavity is formed between the middle fillers. When the main sealing filler is extruded by a high-pressure medium, the inner wall face and the outer wall face of the teflon sealing ring are opened outwards, and the inclined faces are fully extruded to achieve ultrahigh-pressure environment sealing.

The invention relates to the field of diaphragm valve control mechanisms, in particular to a valve actuator and a using method thereof.The valve actuator comprises a valve body and a valve deck fixed to the top of the valve body and further comprises an actuator mechanism, and the actuator mechanism comprises a lower cylinder cover, a cylinder body and an upper cylinder cover which are vertically communicated in sequence; a piston rod penetrating out of the valve deck downwards is arranged in the middle of the upper cylinder cover in a penetrating mode, and the cylinder body is divided into an upper air chamber and a lower air chamber by a piston disc outside the piston rod. The rotatable sliding ring is arranged to be communicated with the upper air pipe connector and the lower air pipe connector, two-degree-of-freedom flexible adjustment of the circumferential position and the rotation direction of the air pipe connector is achieved, and the problem of installation adaptation caused by the fact that the position of an existing actuator air pipe connector is fixed is solved; the sliding ring is unlocked by squeezing the two sets of elastic pieces to be close to the supporting ring, the air pipe connector is driven to adjust the circumferential distribution position so as to adapt to different circumferential layouts of external air path connectors, and operation is convenient and fast.

The invention discloses a fluid sealing structure and a fluid control device in a semiconductor technological process. The fluid sealing structure in the semiconductor technological process comprises a sealing ring, a supporting ring and an elastic sealing ring. A first inclined surface is formed on the outer side wall of the sealing ring close to the bracket; the supporting ring is located on the side, close to the support, of the sealing ring, a second inclined face is formed on the outer side wall, close to the sealing ring, of the supporting ring and abuts against the first inclined face, and a preset axial gap is formed between the lowest end of the second inclined face and the lowest end of the first inclined face. The elastic sealing ring is compressed between the supporting ring and the step part and continuously applies axial force to the supporting ring, so that the second inclined surface pushes and presses the first inclined surface. The problem that in the prior art, abrasion resistance and corrosion resistance cannot be considered at the same time in some processes is solved, and the abrasion resistance of sealing between the valve rod and the upper sealing cover is improved.

The invention relates to a precision pipe fitting weld joint polishing treatment device and a treatment method thereof. The device comprises a fixing base and a polishing assembly, the polishing assembly comprises a center block, walking supporting structures are fixed to the two ends of the center block, two supporting rings are rotatably installed on the outer side of the center block, a rotating plate is fixed between the two supporting rings, and a transmission gear ring is fixed to the inner side of one end of the rotating plate; a transmission gear is installed on the inner side of the transmission gear ring in a meshed mode, the transmission gear is axially connected with a polishing motor, the polishing motor is fixed to the interior of one end of a center block, the other end of the center block is provided with an air hole, the air hole penetrates through the center block, a plurality of adjusting electric telescopic rods are inserted into the surface of the rotating plate, and polishing pads are fixed to the outer ends of the adjusting electric telescopic rods. Leakage of the polishing agent can be reduced, the polishing time is shortened, and the polishing efficiency is improved.

A sealing structure having a circular pillar-shaped shaft that has an annular groove, which is continuous in a circumferential direction, on an outer circumferential surface, a housing having a shaft hole into which the shaft is inserted, a seal ring which seals a gap between the shaft and the housing, and a backup ring disposed on the low-pressure side of the seal ring inside the annular groove, wherein: there is a tapered surface α on the low-pressure side of the groove bottom of the annular groove; a taper angle θα is 15° to 50°; the backup ring has a tapered surface β; and a taper angle θβ is larger than the taper angle θα.

A moxibustion positioning device is provided. [Solution] The moxibustion device comprises a moxibustion cylinder body 110 and a support ring 120, with support rods 121 symmetrically fixed to the tips of the support rings, sliding plates 111 symmetrically fixed to the outside of the moxibustion cylinder body, the sliding plates slidably attached to the support rods, a micro-needle 113 fixed to the bottom end of the moxibustion cylinder body, a support cover 130 fitted to the bottom end of the support ring with a screw structure, a first annular groove formed at the bottom end of the support cover, a first circular ring fixed to the inner wall of the first annular groove, a second circular ring attached to one side of the first circular ring with Velcro (registered trademark), and an adhesive tape attached to one side of the second circular ring. The positioning device is accurate in positioning, adjustable in height, stable in fixing, easy to operate, safe, reliable, and adaptable, and meets the requirements for precision and stability of moxibustion.

The invention relates to a novel oil seal for a bearing unit, which comprises an external sealing element and an internal sealing element which can rotate relatively, the external sealing element is hermetically connected with the inner wall of a bearing outer ring, and the internal sealing element is hermetically connected with a bearing inner ring; a first protective barrier is formed through the first bend arranged on the first metal framework, so that external silt is not prone to directly impacting the second sealing lip. And then through three-stage sealing of the second sealing lip, the third sealing lip and the fourth sealing lip, water vapor is prevented from entering. Three contact lips are arranged on the first sealing lip, and three-level sealing is achieved. The bearing further has the sealing effect that an integrated structure is formed by sealing of the annular protrusion and the bearing inner ring, sealing of the first sealing layer and the bearing outer ring and sealing of the second sealing layer, and a third sealing layer at the end of the supporting ring enables the first rubber layer to be connected with the supporting ring more firmly. The whole oil seal is provided with 11 sealing structures, rubber sealing is arranged on the outer periphery, the inner periphery and the end face, and water vapor can be prevented from entering the oil seal.

The utility model discloses a connector and a plant protection unmanned aerial vehicle, the connector comprises a first rubber core and a sealing piece, and the first rubber core comprises a connecting part; the sealing piece comprises a supporting ring and an elastic sealing part, the supporting ring is connected to the connecting part in a sealing mode, and the supporting ring surrounds the connecting part by a circle; the sealing part is connected to the supporting ring, the sealing part is used for sealing insertion of the connector and an external matched connector, and an avoiding groove is formed between the sealing part and the supporting ring; and when the connector is plugged with an external matching connector in a matching manner, the sealing part floats towards or away from the avoiding groove along the plugging direction. The connector provided by the utility model is better in sealing performance.

The utility model discloses a rotary hand handle storage box relates to hand handle storage field, including show shelf, and the top of show shelf is inserted with the seal cover, and the seal cover is transparent acrylic material, and show shelf includes base structure, and the top fixed with the decoration frame of base structure, and base structure includes rotary base, and rotary base includes base main part, and the inner wall fixed connection of base main part bottom end has the clamping block, and the clamping block is equipped with a plurality of groups and is evenly arranged in the inner wall of base main part bottom end, and the inside clamping of rotary base bottom end has the fixed base, and the rotatable connection of fixed base and rotary base has the support ring, and the surface of support ring is provided with a plurality of groups of holes, and every group of holes all installs the ball bearing, and this show shelf is the design of rotatable bottom, and is built -in a plurality of groups of evenly arranged ball bearings, and when rotating, the ball bearing is in the airtight space inside base structure, and the whole is more beautiful, and also can not appear the situation of ball bearing falling, and the whole rotation process is more smooth and stable.

The utility model relates to the technical field of roller presses, and discloses a novel roller sleeve device of a roller press. The novel roller press roller sleeve device comprises a main shaft, a limiting pipe is installed on the outer side of the main shaft in a penetrating mode, a roller sleeve is installed on the outer side of the limiting pipe in a penetrating mode, a through hole is formed in the outer side of the roller sleeve, a limiting plate is installed on the outer side of the main shaft in a penetrating mode, and a limiting bolt is installed on the outer side of the limiting plate in a penetrating mode. Balls are installed at the front ends of the limiting plates in an embedded mode, supporting rings are installed below the main shaft in an embedded mode, supporting rollers are installed in the supporting rings and connecting rings in a fan shape with the center of the main shaft as the reference, the supporting rollers are rotationally connected with the supporting rings and the connecting rings, and the supporting rings and the connecting rings are rotationally connected with the main shaft through the supporting rollers. In this way, the supporting roller can replace a bearing, and the supporting ring and the connecting ring can be quickly taken down after the connecting bolt is taken down, so that the compression roller is convenient to disassemble and assemble.

The utility model relates to the technical field of electric push rods, in particular to a top pipe sealing structure for an electric push rod. The utility model discloses a top pipe sealing structure for an electric push rod, which comprises a straight cylindrical shell, one axial end of the shell is used for being connected with a gear box, a framework oil seal is arranged at one end, far away from the gear box, in the shell, and a clamping groove is arranged at one end, far away from the gear box, in the shell. A clamping groove is formed in the framework oil seal, a shaft check ring used for axially limiting the framework oil seal is arranged in the clamping groove, two sets of supporting rings are arranged at the end, away from the shaft check ring, of the framework oil seal, a mounting ring is arranged between the two sets of supporting rings, and the axial end, close to the supporting rings, of the mounting ring is provided with a step face in an inward shrinkage shape. A sealing ring is arranged in the step face, and the sealing ring and the framework oil seal are used for being arranged on the outer circle face of a jacking pipe in a sleeving mode. The utility model has the advantages that the oil leakage can be prevented, and the overall stability of the structure can be enhanced at the same time.

The present application relates to the field of metal plate correction, especially to a metal plate clamping and correcting device, comprising: at least two groups of mounting racks arranged on the same horizontal plane and a middle shaft rotatably connected to the mounting racks, a plurality of extrusion rings being detachably arranged on the outer side of the middle shaft, each extrusion ring comprising a positioning plate and an adjusting plate, the positioning plate and the adjusting plate being connected end to end to form a ring structure, one end of the adjusting plate being inserted into the interior of the positioning plate to adjust the radius of the ring structure formed by the positioning plate and the adjusting plate, a filling assembly being arranged in the interior of the positioning plate and the adjusting plate to support the inner wall of the ring structure, and the filling assembly being deformed along with the ring structure. The extrusion ring is arranged to perform extrusion, which is different from the pressure roller, and the extrusion effect is formed by the detachable extrusion ring. Since the extrusion ring is detachable, the extrusion can be performed only on the curved part during actual use, thereby ensuring the clamping and correcting effect.

The invention discloses a multi-face-attached anti-deformation silicone tube sealing ring, and belongs to the technical field of sealing washs.The multi-face-attached anti-deformation silicone tube sealing ring comprises a base body, a connecting part is arranged at the top of the base body, an attaching part is arranged on the inner side of the upper portion of the connecting part, a sealing part is arranged on the inner side of the attaching part, and the outer side of the attaching part and the inner side of the connecting part are attached to each other; the outer side of the sealing part and the inner side of the attaching part are attached to each other, a first supporting ring is arranged in the connecting part, a second supporting ring is arranged in the attaching part, a third supporting ring is arranged in the sealing part, and a supporting assembly for supporting the base body is arranged in the base body. The base body and the connecting part are attached to the outer side of the silicone tube, the attaching part is attached to the end of the silicone tube, and the sealing part is attached to the inner side of the silicone tube, so that the effect of attaching multiple faces of the silicone tube is achieved, a sealed closed loop can be formed, and the situation that a medium leaks from a gap between the outer wall of the tube and the sealing ring, a gap between the end face of the tube and a gap between the inner wall of the tube and the connector is avoided; and a leakage blind area is eliminated.

The damping-adjustable pull rod comprises an outer rod and an inner rod which are matched with each other, the inner rod is coaxially nested in the outer rod and can slide relatively, a fixing screw is sleeved between the outer rod and the inner rod in a matched mode, and an annular cavity is formed between the outer rod and the inner rod. A first damping spring and a second damping spring are installed at the two ends of the annular cavity respectively, a supporting ring is arranged in the middle of the annular cavity and located between the first damping spring and the second damping spring, the supporting ring is connected with the outer wall of the head of the inner rod through threads, and an elastic ring is installed on the outer surface of the supporting ring in a matched mode; the outer surface of the supporting ring is in interference fit with the inner wall of the outer rod through the elastic effect, continuous friction resistance is generated, damping can be provided in the whole telescopic movement process, particularly, effective buffering is provided at two limiting positions, stable friction damping is provided in the middle stroke, and the damping size can be adjusted according to actual needs.

The utility model discloses a kind of electromagnetic valve sealing ring and support ring assembly equipment, including workbench, injection molding assembly placement tooling is provided on the workbench, sealing ring feeding assembly, sealing ring moves and transfers assembly component, support ring feeding assembly and support ring moves and transfers assembly component.This scheme is integrated by injection molding assembly placement tooling, sealing ring feeding assembly, sealing ring moves and transfers assembly component, support ring feeding assembly and support ring moves and transfers assembly component, the automatic assembly to sealing ring and support ring is realized, effectively promote production quality and production efficiency.

The utility model discloses a shockproof damping device for a bridge, and relates to the technical field of bridge damping. The damping device comprises two mounting plates, a mounting seat is fixedly connected between the two mounting plates, a viscous damper is movably connected to the inner side of the mounting seat through a rotating shaft, and a damping support is fixedly connected to one side of each mounting plate; a main buffering assembly is arranged on one side of the mounting plate and comprises a supporting ring fixedly connected to one side of the damping support. Through the coupling effect of the friction dampers of the main buffering assembly and the first springs, dual energy consumption of coulomb friction and elastic deformation is generated in the initial vibration stage, the peak acceleration is effectively reduced, the eight friction dampers distributed at equal angles form an annular buffering array, omni-directional dissipation of horizontal vibration in any direction is achieved, and the vibration damping effect is improved. The three-dimensional supporting structure of the damping support is matched, and the stress concentration phenomenon of a traditional one-way damper is eliminated.

This invention discloses a high-viscosity heavy oil heat exchanger based on a spin-flow tortuous tube, comprising a shell, tube-side inlet and outlet, and shell-side inlet and outlet; a heat exchange tube bundle connected between the tube-side inlet and outlet, the heat exchange tube bundle being composed of multiple U-shaped spin-flow tortuous tubes arranged side by side; each spin-flow tortuous tube includes a tortuous tube inlet, a spiral guide rib, a tortuous tube outlet, and a vibration-damping support ring, the spiral guide rib being disposed on the inner wall of the vibration-damping support ring, the pitch of the spiral guide rib increasing linearly along the heavy oil flow direction; multiple baffles are uniformly arranged circumferentially on the heat exchange tube bundle, each baffle having multiple tube holes, the spin-flow tortuous tubes passing through the tube holes of the baffles and fitting with the clearance; an online cleaning device is installed on the shell, the online cleaning device monitoring the scaling condition through an acoustic wave monitor, and the control unit controlling a pulse generator to emit pulse waves to clean the scaling. This invention can achieve efficient and stable heat exchange of high-viscosity heavy oil under low energy consumption conditions, while simultaneously solving the performance degradation problem caused by scaling through an intelligent cleaning system.

The utility model discloses a high-strength high-temperature-resistant rubber sealing element which comprises a sealing ring, a bayonet, a shaft hole and a supporting sealing structure. After the sealing ring is installed and a shaft is in butt joint with the interior of the shaft hole, the supporting ring can support the shaft so as to ensure that the shaft is high in stability and good in supporting performance after being installed in the shaft hole, the stability of the shaft after being installed in the shaft hole is ensured, then the threaded pressing ring is rotated, and due to the fact that the threaded pressing ring is in threaded connection with the connecting screw rod, when the threaded pressing ring is rotated, the shaft is not damaged. The threaded pressing ring can push and press the pressing plate so as to extrude the sealing ring, the sealing ring is stressed to deform and then is pressed on the surface of the shaft, the sealing performance is improved, when the sealing ring is pushed and pressed by the pressing plate, under the action of the notch, the port part of the sealing ring can contract and is tightly pressed on the shaft, and the sealing capacity is further improved.

The utility model discloses a breaker electric operation mechanism with long service life, comprising a mounting rack, a driving motor, a transmission assembly, a support wheel, a main shaft and a planetary gear assembly, the driving motor is mounted on the mounting rack, the support wheel is rotatably arranged on the mounting rack through the main shaft, and the driving motor is connected with the main shaft through the transmission assembly. The planetary gear assembly comprises an inner gear and multiple sets of duplex planetary gears, a transmission gear is arranged on the main shaft, the inner gear is in meshed connection with the three sets of duplex planetary gears, a gear shaft is arranged on one side of the inner gear, a cover plate is arranged on one side of the mounting frame, and a shaft hole is formed in the cover plate; and the supporting ring is made of a plastic material, is arranged on the shaft hole of the cover plate, and is sleeved on the periphery of the gear shaft. The plastic part is arranged on the shaft hole of the cover plate and used for being matched with the gear shaft, the perpendicularity of the gear shaft of the inner gear is guaranteed, abrasion between the cover plate of the mounting frame and the gear shaft of the inner gear is reduced, and the service life of the circuit breaker electric operation mechanism is prolonged.