327 results about "Face seal" patented technology

The invention discloses a mechanical sealing structure with a double-face sealing effect, and particularly relates to the technical field of mechanical bearing sealing, the mechanical sealing structure comprises a sealing self-compensation mechanism, the sealing self-compensation mechanism comprises a movable shaft ring, a plurality of movable folding strips, a compensation embedded ring and a movable sealing ring, one end of each movable folding strip is fixedly connected to one end face of the movable shaft ring, and the other end of each movable folding strip is fixedly connected to the other end face of the movable shaft ring; the other end part of each movable folding strip is fixedly connected with a compensation embedded ring; the movable sealing ring is fixedly located on one side of the compensation embedded ring. By means of the sealing self-compensation mechanism, automatic compensation of the movable sealing ring and the static sealing ring is achieved through temperature, the sealing influence of thermal expansion and cold contraction caused by temperature changes is effectively dealt with, and the double-face sealing durability of the mechanical bearing is greatly improved; therefore, the problems that automatic adjustment is difficult to avoid excessive extrusion during high-temperature expansion and automatic fitting is difficult to maintain sealing during low-temperature shrinkage, and then the durability of double-sided sealing of the mechanical bearing is poor are solved.

The utility model belongs to the technical field of thermal management, and discloses a runner plate structure, a cooling system and an automobile, the runner plate structure comprises a runner plate assembly, the runner plate assembly is an injection molding element, the runner plate assembly comprises a runner plate body and a water valve body, the runner plate body is provided with a first connecting port, and the water valve body is provided with a second connecting port. The water valve body is provided with a second connecting port, and the second connecting port is communicated with the first connecting port. The water valve body and the runner plate body are integrally formed in an injection molding mode, the connection sealing performance of the water valve body and the runner plate body is improved, leakage of cooling liquid in the circulation process between the water valve body and the runner plate body is avoided, the connection between the water valve body and the runner plate body does not need a radial sealing ring, an end face sealing ring and a bolt any more, and therefore the sealing performance of the water valve body and the runner plate body is improved. Therefore, the problem of leakage of the cooling liquid caused by mismatching of the sizes of the end face sealing ring, the radial sealing ring and the bolt is avoided.

The utility model discloses a quick connecting structure for metal pipe fittings, which relates to the technical field of metal pipe fitting connecting equipment and comprises a first connecting pipe and a second connecting pipe. The quick connecting mechanism is arranged on the outer side of the first connecting pipe and the outer side of the second connecting pipe; according to the utility model, one-key quick connection is realized through the insertion matching of the connecting insertion plate and the connecting insertion groove and the mechanical locking design that the round head jacking column is automatically clamped into the positioning hole under the driving of the spring, and the threaded matching of the locking ring and the second connecting sleeve further limits the displacement of the round head jacking column, so that the mounting efficiency and reliability are obviously improved; in a connection state, the two groups of sealing rubber plugs are separated from the fixed annular plate under the action of the extrusion ejection block, so that the pipeline is communicated, meanwhile, the connection sealing ring is pressed to deform to form end face sealing, double sealing of an internal channel and a connection interface is achieved, the sealing rubber plugs automatically reset to block medium flow during separation, and the leakage risk after disassembly is effectively prevented.

A filter cartridge can include a media pack including media extending between a first end and a second end along a longitudinal axis; an end cap secured to the media and including: a seal member presenting a radially inward or outward facing seal surface, the seal member being formed from a first material; and a support structure including a base part and a plurality of spaced apart, radially flexible extensions, the support structure being formed from a second material harder and / or stiffer than the first material. At least a portion of the base part is covered by and / or embedded within the first material, and the plurality of flexible extensions includes an exposed portion that is uncovered by and / or embedded within the first material and defines an axial end of the filter cartridge and is coincident with a radial innermost portion of the end cap. The seal surface and the exposed portion of the flexible extensions are axially aligned such that a plane orthogonal to the longitudinal axis can pass through the seal member and through the exposed portion of the plurality of flexible extensions.

The invention relates to the technical field of sealing performance detection devices, in particular to an intensive end face sealing testing device and a testing method.The intensive end face sealing testing device comprises a base body, medium liquid can pass through a medium liquid channel, set pressure intensity can be achieved, and therefore the sealing performance of a sealing assembly can be tested. The sealing performance and the service life of the sealing assembly can be ensured to be clear before a product is installed on the sealing assembly, the quality reliability of the product is improved, meanwhile, the sealing assembly of various specifications can be tested only by replacing the cover plate of the tool, intensive end face sealing testing is achieved, the confidence coefficient of a testing result is improved, the reuse rate of the tool is improved, and the cost is reduced. The test period is accelerated, the test cost is reduced, and the test efficiency is greatly improved.

The utility model discloses an end face sealing test device, which comprises a test joint, a slot for inserting a gas cylinder interface is arranged in the test joint, a step groove is arranged at the inner side end part of the slot far away from a gas cylinder, a first sealing ring is filled between the step groove and the gas cylinder interface, and a second sealing ring is filled between the first sealing ring and the gas cylinder interface. The end portion, close to the gas cylinder, of the inserting groove is turned outwards to form an arc surface which is attached to the surface of a gas cylinder connector, and a second sealing ring is filled between the arc surface and the gas cylinder connector. Through the design of the test joint, the slot, the stepped groove, the first sealing ring, the arc surface, the second sealing ring, the test connecting ring, the locking assembly and other parts, efficient sealing of the gas cylinder interface is realized, the sealing performance is improved, the reliability and the stability in the test process are ensured, the test is carried out in a double-sealing mode, and the test efficiency is improved. Different from conventional air tightness test equipment, it is ensured that no air leakage phenomenon exists at the interface in a high-pressure environment, and the accuracy of a test result is improved.

The utility model provides a clamp type grain surface sealing device. The clamp type grain surface sealing device mainly comprises a base and an extrusion component, and a pincerlike structure is formed through the hinge. The jaw can stably clamp an operated object (a U-shaped groove, a hose and a film). By pinching and pressing the handle, the extrusion part of the jaw can extrude the hose, and the hose and the film are pressed into the U-shaped groove together, so that sealing operation is realized. When the handle is released, the handle and the extrusion component automatically reset under the elastic action of the spring. And when the device is moved to the next position, the sealing operation can be continued. Automatic processing of the grain surface sealing process is achieved, operation is easy, and the working efficiency is effectively improved; the extrusion effect on the thin film and the hose can be reduced, and the service life of related facilities is prolonged; and the safety is good, and hands of operators can be prevented from being hurt in the construction process.

The utility model belongs to tank body plugging technical field discloses a kind of tank body end face plugging device, including fixed subassembly, sealing assembly and locking assembly, fixed subassembly includes fixed band and at least two positioning locks, two positioning locks are respectively abutted in the opposite sides of the radial direction of the cylindrical outer lateral wall of tank body, fixed band is encircled in the circumferential of the cylindrical outer lateral wall of tank body and passes through positioning lock;Sealing assembly includes sealing band and flexible sealing block, sealing band is respectively connected with two positioning locks, flexible sealing block is connected on sealing band, and the side surface of flexible sealing block covers the leakage point on the end face of tank body;Locking assembly is provided with two groups, and fixed band and sealing band are respectively connected with a group of locking assembly, so that locking assembly is tensioned to make positioning lock abut tightly cylindrical outer lateral wall, and locking assembly is tensioned to make sealing band drive flexible sealing block plugging leakage point.The device structure is simple, easy to operate, and can effectively realize the plugging of tank body end face.

The application discloses a pipe end face sealing equipment, which comprises a sealing unit, and the sealing unit comprises a pipe end face cutting device, a pipe end face forming device and a visual detection device. The pipe end face cutting device is used for cutting the pipe end face. The pipe end face forming device is used for heating and forming the pipe end face after being cut by the pipe end face cutting device, so as to seal the pipe end face. The visual detection device is used for acquiring image information of the pipe end face after being cut by the pipe end face cutting device and / or acquiring image information of the pipe end face after being heated and formed by the pipe end face forming device. The pipe end face sealing equipment can be seamlessly connected with a preceding cutting machine, can automatically convey the pipe for processing, can improve the processing efficiency, and can acquire the pipe end face image information through the visual detection device, so that whether the forming is successful can be known, and remedial measures can be taken, and the shaping effect is improved.

The utility model discloses an ultrahigh-pressure blowout preventer side door sealing device which comprises a side door sealing assembly installed between a blowout preventer shell and a side door assembly, and side end face sealing rings and end-end sealing rings are arranged on the side contact faces of the side door sealing assembly and the blowout preventer shell and the side contact faces of the side door sealing assembly and the side door assembly. The side door sealing assembly is arranged between the blowout preventer shell and the side door assembly, the side door sealing assembly is provided with the side end face sealing ring and the end sealing ring, the side door assembly can extrude the side door sealing assembly under the action of pre-tightening force of a side door bolt, the side door sealing assembly is tightly attached to the blowout preventer shell, and under the action of internal pressure of a blowout preventer, the side door sealing assembly can be tightly attached to the blowout preventer shell. The end face sealing rings extrude outwards, the side end face sealing rings and the end sealing rings form two sealing barriers, mutual complementation is formed, sealing is reliable, and long-term sealing can be guaranteed through the two seals.

The invention discloses a high-speed end face sealing testing device and a testing method thereof. The high-speed end face sealing testing device comprises a machine base, a driving system installed on the machine base, a load simulation system, a medium system, a multi-physics field coupling system, a high-precision measuring system and a data collecting and processing system. Meanwhile, the tested sealing element is installed in the testing cavity, a moving ring part of the tested sealing element is connected with an output shaft of the driving system, and a static ring part of the tested sealing element is installed on an end cover of the testing cavity. By integrating the driving system, the load simulation system, the medium system and the multi-physical-field coupling system, extreme working conditions from a steady state to a transient state, from a normal temperature to cryogenic / high temperature and from a single load to multi-field coupling can be simulated, and full-spectrum working conditions of high-end equipment such as an aero-engine and the like are covered.

The utility model relates to the technical field of pharmaceutical equipment, and discloses a sealing, scraping and guiding combined device and a dry type granulator, the sealing, scraping and guiding combined device comprises: an end face sealing device, which encloses a pre-pressing space, a main compaction space and a discharge space with the outer peripheral surfaces of a first compression roller and a second compression roller; the scraping and guiding device comprises a first scraper and a second scraper, the first scraper and the second scraper are suitable for shoveling, scraping and removing materials adhered to the peripheral surfaces of the first compression roller and the second compression roller, a guiding space is formed between the first scraper and the second scraper, and an outlet of the guiding space is communicated with an inlet of the granulating cavity. According to the sealing, scraping and guiding combined device provided by the utility model, the first scraper and the second scraper are arranged to scrape and remove materials adhered to the peripheral surface of the compression roller, and the materials are guided to the granulating cavity through the guiding space between the first scraper and the second scraper, so that the scraping and guiding device integrates a material scraping function and a material guiding function; therefore, the structure of the sealing scraper combination device is more compact, and the requirement for small and exquisite appearance of equipment is met.

The invention discloses an unloading type test tool for a gas swing device of a liquid rocket engine and a use method of the unloading type test tool. The tool comprises a mandrel assembly, a first nut, a first compression ring, a second compression ring, a first flange and a second flange. The lower end of the mandrel assembly and the product are sealed in an end face mode. A first pressing ring, a second pressing ring, a first flange and a second flange are installed at the upper end of the gas swing device, and end face sealing is adopted between the first flange and the gas swing device. The first flange and the second flange as well as the second flange and the mandrel assembly are sealed through sealing structural parts. And after the first nut and the mandrel assembly are assembled, the second pressing ring is pressed tightly, and the limiting effect on the second flange is achieved. And the inner diameter of the first flange is equal to that of the corrugated pipe of the fuel gas swinging device. In the state, the axial stress of the corrugated pipe in the test process is zero, and therefore the requirement that the fuel gas swing device is not stressed in the axial direction in the test process can be met. The device has the advantages of being simple in structure and convenient to mount and dismount.

The application provides a grinding device for hydraulic valve conical surface sealing, and belongs to the field of hydraulic valve debugging equipment. The grinding device comprises a fixing part, a smearing part and a moving part. The fixing part is provided with a limiting structure and a movable assembly for driving the limiting structure to rotate. The smearing part is used for smearing lubricating oil or / and grinding paste on the structure part. The moving part is used for limiting the structure part and driving the structure part to move. The grinding device for hydraulic valve conical surface sealing can automatically complete the conveying of the structure part, the smearing of lubricating oil and grinding paste and the grinding of the structure part through the cooperation of the fixing part, the smearing part and the moving part, effectively solves the problem that the leakage of the valve part exceeds the standard, and improves the sealing effect of the valve part. The grinding device for hydraulic valve conical surface sealing also has the characteristics of high automation degree, saving of manpower and high work efficiency.

The utility model relates to the technical field of nondestructive testing, in particular to a compensation tool for detecting the leakage of a butt weld end vacuum cover, which comprises a base, an extension piece, a sealing piece and a bracket. The base has a first working surface; the extension piece is connected with the base and provided with a second working face. The sealing piece is connected with the extension piece and used for being in contact with the end face of the detected workpiece, the sealing piece is provided with a first matching face and a second matching face which are flush with the second working face, and the first matching face and the second matching face are used for being matched with the vacuum cover; the bracket is connected with the base and is used for forming fixed fit with a detected workpiece; in a working state, when the base is in contact with a detected workpiece through the first working surface, the second working surface of the extension piece is connected with the detected workpiece through the sealing piece and is flush with the detection surface of the detected workpiece. According to the invention, leakage detection of the end part of the welding seam can be realized.

The invention provides a quick flange connector. The quick flange connector comprises a connector body; the plurality of fixing units are mounted in the circumferential direction of the connector main body; the sealing element is arranged in the middle of the connector main body, and the flange is clamped between the sealing element and the fixing unit; the fixing unit includes: a cam rotatably disposed on the connector main body; and the cam is provided with a spiral surface, the spiral surface is arranged on the cam, and the flange is clamped by the spiral surface by rotating the cam. The cam is sequentially rotated through the operating handle, the spiral face on the cam axially clamps the back face of the flange, the flange is attached to the end face sealing element on the connector body to achieve rapid axial locking and axial sealing, self-tightening force is formed when a pipeline is pressed, and loosening is prevented; therefore, the flange can be quickly connected, the connecting efficiency is high, and the operation is convenient and fast.

A fluid-immersion shredder is provided. The shredder includes a wall structure defining a chamber configured to contain a liquid. At least a portion of the wall structure includes an interior wall adjacent an exterior wall, the interior wall and exterior wall having an opening therethrough. The shredder further includes a drive shaft extending through the opening and into the chamber. The shredder further includes a sealing assembly extending radially around the drive shaft at least in the area of the opening, the sealing assembly including a metal-faced seal assembly, such as a CAT® seal in the area between the opening in the exterior wall structure and the shaft.

The invention discloses a Dewar flask upper end face sealing structure for a physical adsorption instrument, which comprises triangular cake structures capable of being spliced into a cylinder, each triangular cake structure is provided with an upper functional layer, a middle functional layer and a lower functional layer, the upper functional layer is a weight applying layer, the middle functional layer is an anti-leakage layer, the lower functional layer is a porous fixed supporting layer, and the sections of triangular cakes are the same. And two radiuses corresponding to the central angles of the fan-shaped structures of the upper functional layer, the middle functional layer and the lower functional layer are respectively provided with an inward semicircular gap. The blocking structure between the Dewar flask and the sample tube for the physical adsorption instrument is simple in structure, during working, low-temperature nitrogen volatilized and released from the Dewar flask condenses gas water in air in gaps into ice, the gaps are automatically filled with the ice, the periphery of the outer side of the sample tube can be blocked, loss of liquid nitrogen in a liquid nitrogen container is effectively reduced, and the service life of the sample tube is prolonged. The sustainable testing time after one-time liquid nitrogen adding is prolonged, and the testing effect is guaranteed.

The utility model discloses a charging port semi-finished product airtightness test tool, and relates to the technical field of charging port testing. The charging port semi-finished product airtightness test tool comprises a box body, an alternating current plugging structure, a first sealing structure, a second sealing structure, a third sealing structure and a fourth sealing structure, and two groups of product cavities which are distributed left and right are fixedly installed on the box body. According to the air tightness test tool for the semi-finished charging port, traditional multi-process detection is integrated into an integrated test process through structural innovation, the number of processes is reduced, the process flow is shortened, and the detection efficiency is remarkably improved; a waterproof pad end face sealing structure is adopted, the lower die is provided with a profiling gun inserting head and a silica gel pad sealing assembly, the high working condition reduction degree is achieved, the detection accuracy is remarkably improved, meanwhile, the requirement for operators is reduced due to detection procedure integration, the production cost is reduced, the number of tools is reduced due to the integrated design, and the production efficiency is improved. And the investment cost of equipment is reduced, and the practicability of the tool is improved.

The utility model relates to the technical field of printing machinery, in particular to a multi-face turnover seal which comprises a base. The shell is arranged on the base in a sliding mode, and the shell can slide relative to the base in the vertical direction; the spring is arranged between the base and the shell and is used for providing reset elastic force; the sensor is arranged on the shell and is used for detecting the position of the shell relative to the base; the multi-face seal penetrates through the base and is rotationally arranged in the shell; and the multi-surface seal can be automatically overturned to another seal surface after the seal operation is completed by pressing the shell. The inconvenience of frequently replacing stamps or carrying a plurality of stamps is avoided, and the office and operation efficiency is greatly improved. The seal template is ensured to be accurately positioned after being overturned each time, so that high-precision and high-efficiency automatic overprinting is realized.

The utility model relates to the technical field of oil pan gaskets, and discloses an air cylinder oil pan gasket which comprises an oil pan body, a first installation hole is formed in the top of the oil pan body, a first installation hole is formed in the bottom of the oil pan body, a limiting hole is formed in the bottom of the oil pan body, and a limiting clamping groove is formed in the surface of the oil pan body. An arc-shaped limiting plate is arranged in the limiting clamping groove, and the top of the arc-shaped limiting plate is fixedly connected with a top gasket. According to the oil pan upper cover, the arc-shaped limiting plate clamp is arranged, the arc-shaped limiting plate clamp is clamped in the limiting clamping groove, then the top of the top gasket is connected with the top of the oil pan body, the rear side surface of the side face sealing gasket is connected with the inner wall of the oil pan body, and then the oil pan upper cover and the positioning block are positioned and installed; the upper portion and the lower portion are fixed through the first installation hole and the second installation hole, and sealing installation is formed through matching of the arc-shaped limiting plate, the top cushion plate and the side face sealing cushion plate.

The application relates to an insulation piercing connector and a forming process, and relates to the technical field of insulation piercing connectors. The process comprises the following steps: providing a blade belt and a gasket belt; synchronously feeding the blade belt and the gasket belt into a co-extrusion die head and compounding with molten plastic, continuously extruding a first plastic body, so that the blade belt is exposed on the blade edge side and the rest is embedded in the plastic body, and the gasket belt is completely embedded in the plastic body; cutting to a fixed length; stamping and forming piercing teeth and bolt holes; and covering exposed end faces with plastic elastic second plastic bodies at both ends. The product comprises the first plastic body, the embedded piercing blade, the completely embedded gasket and the second plastic body covering the end faces. The traditional discrete injection molding is reconstructed into a continuous co-extrusion integrated process, the production efficiency is doubled, the positioning precision of the embedded part is high, and the double end face sealing guarantees long-term electrical reliability.

The utility model discloses a kind of high air-tight eye shadow pen mould, including fixed mould seat, press mould, mould module, core-pulling driver and self-sealing element. The mould module surface is provided with mould cavity, the output end of the core-pulling driver is connected with slide, and the surface of slide is fixed with several cores, and the core is inserted into mould cavity to form the hollow structure of product;The self-sealing element includes guide slide, slide base, push block, sealing plate, seal and inclined guide pin, and the slide base vertically slides along guide slide under the guidance of inclined guide pin, drives sealing plate to close to the surface of mould module, the surface of sealing plate is equipped with the seal corresponding to core one by one, seal extends into mould cavity and is connected with the end of core, and end and the taper hole groove of mould cavity end portion are closely matched. When closing mould, the surface of sealing plate and slide and the end surface of mould module are sealed and abutted, form double sealing structure, to avoid molten material overflow and gas leakage. The mould has the advantages of high air-tight performance, reliable closing precision and high degree of automation.

The utility model provides an end face sealing structure of a screw air compressor, which relates to the technical field of screw air compressors and comprises a machine body and a sealing structure. An end cover is fixedly connected to one end of the machine body, an inlet is formed in the top of the end cover, an outlet is formed in the bottom of the machine body, a sealing structure is arranged at the end of the machine body, and the sealing structure comprises a connecting protruding column fixedly connected to the end of the machine body, and an assembling ring groove is formed in the inner side wall of the connecting protruding column; the fixed inner ring is fixedly connected into the assembly ring groove, mounting carrying grooves are formed in the two sides of the assembly ring groove, through the arrangement of the sealing structure, the attaching shaft ring and the rotating belt shaft are made of special materials, the sealing contact faces of the attaching shaft ring and the rotating belt shaft can be tightly attached after precision machining, leakage of compressed air is effectively reduced, and the service life of the rotating belt shaft is prolonged. Meanwhile, under the action of the elastic piece, the pre-tightening force can be automatically adjusted according to the abrasion condition of the sealing face, it is guaranteed that the sealing face is tightly attached all the time, and the sealing performance is greatly improved.

A hydraulically supported seal including a seal plate operatively coupled with a seal, the seal being supported by a seal carrier within a housing; a piston having a piston shaft, the piston being in operative communication with the seal opposite the seal plate, the piston shaft being disposed through the housing through a piston receiver formed in the housing; a cylinder operatively coupled to the piston opposite the seal; and wherein the piston is hydraulically biased by a hydraulic fluid within the cylinder.

A kind of water turbine movable guide vane end face sealing system and method, including guide vane end face sealing structure, guide vane end face sealing structure is respectively installed on the top cover and bottom ring of water turbine, guide vane end face sealing structure is used to form water seal with the end face of movable guide vane when movable guide vane is closed, guide vane end face sealing structure includes sealing block, top cover and bottom ring are respectively provided with sealing groove, sealing block sliding seal is installed in sealing groove, the bottom of sealing groove is provided with pressure hole, pressure hole is connected with pressure supply system by pressure supply pipeline, the outside of movable guide vane is also provided with pressure measuring hole, pressure measuring hole is connected with pressure supply system by pressure measuring pipeline, pressure supply system controls the on-off of pressure supply pipeline by the pressure in pressure measuring pipeline.The on-off of pressure supply pipeline is controlled by the water pressure of the outside of movable guide vane, so that pressure supply pipeline can be self-adaptively started, the control of pressure supply pipeline and the problem of sealing leakage are solved.

The utility model relates to a release bearing unit with a rubber sleeve with end face sealing and aligning functions, which belongs to the technical field of release bearing structures and comprises an inner ring, a central sleeve is arranged in the inner ring, a clamp spring sleeved with the central sleeve in a clamping and embedding manner is arranged on the outer circle of the front end of the central sleeve, an outer ring sleeved with the inner ring is arranged on the inner ring, and the rubber sleeve is sleeved with the outer ring. A retainer is arranged between the outer ring and the inner ring, a plurality of steel balls which are annularly distributed and are nested with the retainer in a sliding manner are arranged on the retainer, and an end surface sealing ring which is nested with the outer ring is arranged between the end surface of the outer ring and the inner ring. The device has the characteristics of compact structure, good operation stability and long service life. And through the special design of the rubber sleeve, the product is well sealed, excessive frictional resistance is not generated, and the service life is prolonged. And the problem of poor sealing is avoided.

This invention discloses a low-temperature, high-speed, dual-station end-face seal testing device and method for hydrogen-oxygen engine turbopumps. The device includes a housing, a main shaft, rotating ring I, rotating ring II, stationary ring assembly I, and stationary ring assembly II. Stationary ring assembly I and stationary ring assembly II are symmetrically mounted on the housing and respectively contact the two rotating rings mounted on the main shaft to form a dual-station end-face seal. This testing device and method are applied to running-in tests, sampling tests, and research tests of low-temperature, high-speed end-face seals for hydrogen-oxygen engine turbopumps. It can simultaneously and quantitatively measure the leakage of two sets of end-face seals, evaluate the sealing performance of the two sets of end-face seal products, double the testing efficiency, and halve the testing cost.

The invention relates to the technical field of material precision machining equipment, and discloses an ultra-high-speed cutting type precision grinding machine which comprises a rack, a driving device, a grinding cavity provided with a feeding port and a discharging port, and a rotary movable cutter assembly and a fixed static cutter assembly which are arranged in the grinding cavity and driven by a main shaft. And a combined sealing structure is arranged at a relative motion interface between the rotary moving cutter assembly and the fixed static cutter assembly and comprises a non-contact labyrinth seal and a contact mechanical seal which are sequentially arranged in the potential leakage direction of materials. Through the combined sealing design of labyrinth sealing and mechanical sealing, multiple barriers are arranged on a key material leakage path, the labyrinth sealing dissipates material kinetic energy in advance and blocks most materials, and the mechanical sealing provides final reliable end face sealing, so that the leakage rate is reduced, coarse and fine materials are effectively prevented from being mixed, and the sealing effect is improved. And extremely high particle size uniformity and consistency of the ground product are ensured.

The utility model relates to the technical field of test bed exhaust pipeline sealing, and specifically discloses a pipeline flange absorption expansion sealing structure, which comprises a first pipeline, a second pipeline, a packing flange in sealing connection with the end face of the first pipeline, and a graphite packing in sliding sealing connection with the outer wall of the second pipeline, wherein the side of the packing flange away from the first pipeline is provided with a connecting groove matched with the graphite packing, the graphite packing is sealingly embedded in the connecting groove, and the side of the packing flange away from the first pipeline is further detachably connected with a pressing flange for tightly pressing the graphite packing into the connecting groove. The utility model solves the problem of thermal expansion of the exhaust pipeline during the operation of the traditional test bed, which affects the assembly performance of the exhaust pipeline.