281 results about "FLANGE CAP" patented technology

The invention relates to the technical field of robots, in particular to a planetary speed reduction joint module and a robot with the same, and the planetary speed reduction joint module comprises a motor assembly, a planetary speed reducer assembly, a front end cover, a rear end cover and an output flange cover plate; wherein the motor assembly comprises a shell and a motor rotating shaft; the planetary reducer assembly comprises an inner gear ring, a sun gear, a planet carrier and a plurality of planet gear sets, each planet gear set comprises a first-stage planet gear and a second-stage planet gear which are coaxially and fixedly connected, the inner gear ring is fixedly connected with the shell, the sun gear is coaxial and fixedly connected with a motor rotating shaft, the planet gear sets are rotationally connected to the planet carrier, the first-stage planet gears are meshed with the sun gears, and the second-stage planet gears are meshed with the second-stage planet gears. The secondary planet gear is meshed with the inner gear ring; the output flange cover plate is rotationally connected to the front end cover and fixedly connected to the planet carrier. Sealing assemblies are arranged between the rotating shaft and the shell as well as between the shell and the assembly; the motor rotating shaft and the planet carrier are respectively provided with a detection assembly. The invention has the characteristics of compact structure, small volume and light weight.

The utility model relates to the technical field of brakes, and provides an electromagnetic brake convenient to adjust an air gap, which comprises a stator, an armature and a brake disc which are sequentially arranged in the axial direction, and further comprises a dustproof flange cover, the dustproof flange cover is arranged outside the stator in a matched mode, and the brake disc is arranged between the dustproof flange cover and the armature; an air gap measuring hole is formed in the side of the dustproof flange cover, and a locking screw used for abutting against the stator is screwed into the side of the dustproof flange cover. According to the utility model, the air gap can be adjusted more quickly and conveniently, and the operation is simple.

According to the scheme, the hydrogen spherical tank comprises a flange cover arranged on a manhole in the top of a spherical tank shell, and at least one mounting through hole is formed in the flange cover; the outer periphery of the connecting convex ring is arranged on the inner periphery of the mounting through hole in a sealing manner; the at least one connecting pipe structure is arranged corresponding to the connecting convex ring, the interior of the connecting pipe structure is hollow, and the periphery of one axial end of the connecting pipe structure is connected to the inner periphery of the connecting convex ring, so that the connecting pipe structure is fixed on the flange cover through the connecting convex ring; the connecting pipe structures are placed on the flange cover of the manhole in a centralized mode, the interiors of the connecting pipe structures communicate with the inner cavity of the spherical tank shell through the flange cover, the flowing path of a medium in the spherical tank shell is optimized, holes and joints in the spherical tank shell are reduced, the service life of the spherical tank shell is prolonged, and the service life of the spherical tank shell is prolonged. The connecting stress of the connecting pipe structure and the flange cover is reduced, the safety and structural integrity of the spherical tank are improved, and the leakage risk is reduced.

The invention relates to the technical field of low-temperature cooling, and provides a cold shield self-pressing cooling device which comprises a vacuum cavity and a refrigerating machine arranged on the vacuum cavity. The first cold shield flange, the first-stage cold shield and the second cold shield flange form a first-stage cold shield cavity, and the first-stage cold shield cavity is embedded in the vacuum cavity; the first cold shield flange is connected with the bottom end of the first-stage cold shield; the spring assembly is arranged between the second cold shield flange and the top end of the vacuum cavity; and the to-be-cooled test cavity is located in the first-stage cold shield cavity. According to the cold screen self-pressing cooling device, the spring assembly is used for covering the second cold screen flange to the top end of the first-stage cold screen, and the spring assembly can be stretched or compressed when subjected to axial force; by arranging the spring assembly, when the vacuum chamber is closed, the second cold shield flange and the first-stage cold shield can be automatically pressed, so that the assembly difficulty of the first-stage cold shield chamber is greatly reduced, and a certain space can be reserved for the height design of the first-stage cold shield.

The invention discloses an underground high-pressure gas storage sealing material airtightness testing device and method, and relates to the technical field of underground gas storage, and the device comprises a rigid constraint cylinder which is provided with a first flange cover at an upper opening in a sealing manner and a second flange cover at a lower opening, and a concrete sealing tank which is concentrically arranged in the rigid constraint cylinder, a gas cavity is defined in the concrete sealing tank, a mounting cavity is defined between the concrete sealing tank and the rigid constraint cylinder, the air pressure adjusting device is used for adjusting the air pressure of the gas cavity, the high-pressure water bag is arranged in the mounting cavity, the water pressure adjusting device is used for adjusting the water pressure of the high-pressure water bag, and the sealing material layer is arranged on the side wall of the gas cavity. The stress environment of the high-pressure gas storage and the deformation condition of the concrete sealing tank are simulated by controlling the internal air pressure and the external water pressure of the concrete sealing tank, then the sealing performance of the sealing material layer is tested, the testing condition is close to the real environment, and the testing result is more accurate.

The utility model relates to the technical field of machining, in particular to a high-precision rotatable auxiliary supporting device which comprises a rotating center frame body, a rotating body arranged on one side of the rotating center frame body, four adjusting cavities arranged on the rotating body and clamping contacts arranged in the adjusting cavities in a sliding fit mode. The clamping contact comprises a flange cover arranged on the outer wall of the rotating body, a lead screw rotationally connected with the flange cover through a bearing, a nut and a threaded sleeve which are in threaded fit with the lead screw, a sliding sleeve connected with one end of the threaded sleeve, an ejector head arranged at one end of the sliding sleeve and located at one end of the lead screw, and a limiting open groove formed in the outer wall of the sliding sleeve. The locking mechanism is in threaded fit with one side of the rotating body and is in sliding fit with the limiting open slot; according to the device, the swing of the workpiece during supporting is reduced, the machining precision and the qualified rate are improved, the vibration problem in the high-precision machining process of the deep hole drilling and boring machine is solved, the machining precision of the whole machine is guaranteed, the industry development is promoted, and the machining efficiency and the product quality are improved.

The utility model provides a flange cover quick-opening mechanism which comprises a body, a fixing sleeve arranged at the top of the body, a flange cover in threaded connection with the surface of the fixing sleeve, a moving groove formed in the flange cover, a moving ring in sliding connection with the interior of the moving groove, and a pressing handle fixedly connected with one end of the moving ring. And a plurality of fixing holes are formed in the flange cover. According to the flange cover quick-opening mechanism and the flange device, after the flange cover is rotatably inserted into the proper position of the surface of the fixing sleeve, the flange cover is installed, and therefore the flange cover can be conveniently installed and disassembled, and after the flange cover is installed, the pressing handle is loosened, and the flange cover can be quickly opened. And after a plurality of fixing springs push a plurality of fixing pins to enter a plurality of fixing holes correspondingly, the flange cover is limited, so that the situation that the flange cover rotates towards one side due to vibration and is loosened is prevented, and the fixing effect is improved.

The utility model relates to a sampling port structure which comprises a shell and a sampling port, the sampling port comprises an inner pipe and an outer pipe assembly, the outer pipe assembly comprises a first pipe section, a second pipe section, a third pipe section, a first flange, a second flange, a flange cover and an end cover, one end of the second pipe section is welded with the shell, and the other end of the second pipe section is welded with the end cover. The other end of the second pipe section is welded to the first flange, one end of the flange cover is welded to the first pipe section, the other end of the flange cover is welded to one end of the third pipe section, the other end of the third pipe section is welded to the second flange, and a first opening is formed in the inner pipe. A first opening is formed in the first pipe section of the outer pipe assembly, a second opening is formed in the first pipe section of the outer pipe assembly, the inner pipe can rotate relative to the outer pipe assembly, when the inner pipe is rotated, the first opening in the inner pipe can coincide with the second opening in the first pipe section of the outer pipe assembly, an operation handle is arranged on the outer side of the end cover, and therefore the structure is greatly simplified.

The utility model discloses a pressure relief safety device, and belongs to the technical field of air separation equipment. The device is connected with the top of a pump box and comprises a cylinder body, a flange, a flange cover and a fixing pin, the lower end of the barrel is fixed on a top panel of the pump box, and a flange is fixed at the upper end of the barrel; fixing pins are fixed in fixing holes in the periphery of the flange, and the fixing pins are vertically arranged upwards; fixing pins penetrate through holes in the periphery of the flange cover, the flange cover is arranged above the flange, and the flange cover can move up and down in the arrangement direction of the fixing pins; the flange cover is a flange without a central hole, so that the center of the flange cover covers the cross section of the cylinder body; the inner side of the joint of the flange and the flange cover is provided with a cutting notch used for containing a sealing ring, and when the safety device is in a closed state, the flange and the flange cover are connected in a sealed mode. The device is simple in structure, low in manufacturing cost, convenient to use, safe and reliable.

The application provides a device and method for improving the filling density of solid working substance, which comprises a storage cavity for containing the solid working substance, wherein the storage cavity comprises a first opening; a flange plate fixed to the storage cavity, wherein the flange plate comprises a second opening corresponding to the first opening; a flange cover detachably fixed to the flange plate, wherein the flange cover covers the second opening and forms a sealed cavity together with the flange plate and the storage cavity; an air inlet valve and an air outlet valve fixed to the flange cover and communicating with the sealed cavity; and a vibration table for vibrating the storage cavity. According to the above, the application provides a technical solution, wherein the storage cavity is vibrated by the vibration table, so that the solid working substance contained in the storage cavity can be broken, and the filling density of the solid working substance can be rapidly improved.

The utility model discloses a carbon sequestration device in a concrete curing process, which comprises a cylinder body, a flange cover, an air bag, an object placing table and a concrete cube, the flange cover covers the cylinder body, the concrete cube is arranged in the cylinder body through the object placing table, the air bag penetrates through the flange cover through a first connecting pipe and a second connecting pipe to be communicated with the cylinder body, and the air bag is arranged in the cylinder body. The lower portion of the flange cover is connected with a temperature and humidity probe, a lamp and a humidifier. The device has the beneficial effects that the consistency of the pressure intensity in the culture process can be realized by connecting the air bag, so that the influence of the pressure intensity change on the generation rate of the sediment greenhouse gas is avoided, and the air tightness of the device can be ensured by the measure of uniformly mixing the headspace of the bull glass bottle and the air in the air bag through the Kacit peristaltic pump before sampling each time; and regular and multiple sampling monitoring can be realized so as to monitor the carbon sequestration capability of concrete.

The utility model discloses a fracturing temporary plugging agent feeding device and relates to the technical field of oil extraction. A one-way valve B is mounted in the upper valve body, a one-way valve A is mounted in the lower valve body, the upper valve body is hermetically connected with a flange cover above the one-way valve B through a flange, the upper valve body is provided with a prepad fluid inlet pipe above the one-way valve B, the lower valve body is provided with a cylinder sleeve above the one-way valve A, and a piston is in clearance fit connection in the cylinder sleeve through a sealing ring. The outer side of the piston is fixedly connected with a plunger of a hydraulic lever. The fracturing temporary plugging agent feeding device has the advantages that due to the fact that the upper one-way valve A, the lower one-way valve B and the piston are adopted, the space between the one-way valve A and the one-way valve B becomes normal pressure, a fracturing temporary plugging agent can be fed into the lower valve body through a low-pressure pump, liquid and the fracturing temporary plugging agent are fed into a high-pressure manifold through a hydraulic cylinder, and energy consumption during fracturing temporary plugging agent feeding is reduced.

The invention relates to the technical field of screw compressors, in particular to a high-internal-pressure-ratio casing structure of a screw compressor, which can measure a gap of a rotor at a discharge port under the condition that internal and external high pressure ratios are matched, and comprises a compressor casing, a rotor cavity is arranged in the compressor casing, a female rotor and a male rotor are arranged in the rotor cavity, and the female rotor and the male rotor are arranged in the compressor casing. The compressor is characterized in that an integrally-formed platform is arranged above the discharge port of the compressor shell, a through hole is formed in the platform, a flange cover with a shaft for sealing the through hole is arranged on the platform, the shaft of the flange cover with the shaft extends into the through hole, and the end of the shaft of the flange cover with the shaft is a curved surface matched with the inner wall of the rotor cavity. And an O-shaped ring is arranged between the flange cover with the shaft and the platform.

The utility model relates to an anti-theft device for an oil filling port of an oil storage tank on a drilling site. The anti-theft device comprises an oil filler threaded cap, an oil filler threaded pipe column, an oil storage tank manhole flange cover plate and an anti-theft lock. The oil filling port threaded cap comprises a nut and a cover plate, the nut and the cover plate are welded into a whole, the oil filling port threaded cap is in threaded connection with the oil filling port threaded pipe column, and the oil filling port threaded pipe column is fixedly connected to an oil storage tank manhole flange. The oil filling port threaded pipe column and the oil filling port threaded cover cap are respectively welded with a locking lug, the locking lugs are respectively provided with a round hole, and the anti-theft lock penetrates through the locking lugs on the oil filling port threaded pipe column and the oil filling port threaded cover cap and is locked with the locking lugs on the oil filling port threaded pipe column and the oil filling port threaded cover cap. The oil tank truck refueling device is simple in structure, convenient to use and high in working efficiency, not only can be suitable for refueling and theft prevention of different oil pipes of various oil tank trucks, but also has rainproof and dustproof effects, greatly facilitates high-position refueling operation, and improves refueling efficiency.

The invention relates to the technical field of safety monitoring of chemical equipment, and particularly provides an anti-explosion and anti-corrosion chemical sight glass device which comprises a base, a flange seat, a flange cover plate, a first sight glass and a second sight glass. A mirror base is arranged in the flange base, an air bag is arranged on the outer side of the flange base, and a discharge hole is formed in the inner side of the flange base. A spring pin is arranged at the upper end of the inner side of the flange seat, the mirror seat is connected to the spring pin, and the mirror seat can adjust shielding and avoiding in a self-adaptive mode relative to the relief hole according to pressure changes. Through a linkage mechanism of the air bag, the relief hole and the spring pin, the mirror base can automatically move upwards to relieve pressure when the pressure is suddenly increased, precise resetting and sealing are achieved after pressure relief, and the risk that the sight glass bursts is greatly avoided; the annular distributor is matched with the multiple nozzles to spray nitrogen to the bottom of the first sight glass, a dynamic gas film is formed through an arc-shaped annular section, and corrosion medium isolation and mist elimination are synchronously achieved; and the double-sight-mirror redundancy design provides an emergency observation window when the main sight mirror fails, so that the safety of the device is remarkably improved.

The utility model relates to the field of flange caps, discloses a positioning device for processing a high-density flange cap, and solves the problems that when vertex angles of six edges are clamped, the clamping is unstable and the vertex angles are easy to damage, so that the six edges need to be limited during clamping, and the clamping efficiency is high. In order to solve the problems that in the prior art, a plurality of flange nuts are placed in a groove with six edges to be limited under the common condition, but when the flange nuts are limited, the flange nuts are placed one by one in an angle adjusting mode, and time is wasted, the positioning device for machining the high-density flange caps comprises a shell and a first supporting plate arranged in the upper portion of the shell; by arranging the pushing mechanism and the rotating mechanism, when the pushing mechanism moves downwards, the flange cap is pushed to move towards the middle, the pushing mechanism continues to move downwards to drive the rotating mechanism to rotate, and the flange cap is driven to move and rotate downwards, so that the purpose of saving time is achieved.

The utility model relates to the technical field of biomass boiler slag coolers, and discloses a blockage clearing device of a biomass boiler slag cooler, which comprises a slag cooler charging barrel end plate, a blockage clearing mechanism is arranged in an inner cavity of the slag cooler charging barrel end plate, the blockage clearing mechanism comprises a flange seat and a flange cover, one side of the flange seat is fixedly provided with a fixing seat, and the other side of the flange seat is fixedly provided with a baffle. A threaded hole is formed in an inner cavity of the flange base, and a positioning ring is fixedly installed on one side of the flange cover. The blockage clearing mechanism is arranged on the original end plate of the material barrel of the slag cooler, the fixed seat is welded in the inner cavity of the end plate of the material barrel of the slag cooler, the flange cover and the flange seat are connected through the connecting bolt, refractory castable has good heat resistance, foreign matters in the slag cooler are manually taken out after the flange cover is detached, and the blockage clearing mechanism is convenient to use. Foreign matters such as iron wires in the slag are prevented from blocking the slag spraying holes, and the feeding system device of the slag cooler does not need to be disassembled, so that a large amount of manpower and time are saved.

The application discloses an adaptive ball head entering device, which comprises a base, a three-dimensional force sensor installed on the base, a bearing seat installed above the three-dimensional force sensor, a flange cover installed above the bearing seat, a locking cover installed above the flange cover, a ball head seat installed in the flange cover, the ball head seat being located above the bearing seat and a tapered roller bearing being arranged between the ball head seat and the bearing seat, a first central through hole being arranged on the ball head seat, an adaptive positioning section being arranged at the upper end of the first central through hole, and an inner conical surface being arranged on the inner wall of the adaptive positioning section; a second central through hole for the ball head to enter and exit is arranged in the flange cover, a third central through hole for the ball head to pass through is arranged on the locking cover; a control mechanism for controlling the ball head is arranged on the flange cover; the control mechanism comprises a locking through hole arranged in the side wall of the second central through hole, a locking pin installed in the locking through hole and a control driving mechanism for driving the locking pin to move along the locking through hole between a free station, an anti-escape station and a locking station.

This utility model relates to the field of flipping tooling technology, specifically to a rapid flipping device for flange covers. The flipping platform of this utility model is disc-shaped, its size matching the flange cover size. A rubber pad is provided on its surface, and flipping shafts that cooperate with the flipping mechanism are provided on both sides. A hinge seat that cooperates with the drive mechanism is provided on one side of its bottom, and an arc-shaped baffle is provided at the front edge of the flipping platform corresponding to the hinge seat. The flipping mechanism includes two hinged supports, and the support mechanism includes a rear baffle support column. The drive mechanism includes a hydraulic jack, and the buffer mechanism includes a disc-shaped flipping buffer pad. The hydraulic jack enables slow, unidirectional flipping, ensuring the flange cover lands smoothly and preventing damage to the sealing strips. Simultaneously, the rear baffle support column and baffle prevent accidental impact or excessively rapid sliding, and the rubber pad and buffer pad effectively absorb impact, improving operational safety. The device has a simple structure and low manufacturing cost.

The flange cover (1) has thimble-shaped fastening elements (3) that are integrally formed with a cover element (2) and extend transversely thereto to engage in respective through-holes (16) of a flange (14). At least one fastening element (3) has a lateral cam (6) in a section (4) adjacent to its distal end (5), which engages the respective through-hole (16) of the flange (14) in a form-fit and / or force-fit manner, wherein the width (18) of the section (4) with the cam (6) is less than or equal to the diameter (19) of the through-hole (16).

A hydraulic slag pushing device for a slag well of a coal-fired boiler comprises a slag pushing pipe which is horizontally or obliquely installed on the slag well and provided with a pipe body flange plate and a bottom hole, a high-temperature-resistant slag pushing head which corresponds to the horizontal or downward oblique installation of the slag pushing pipe and is installed in the slag pushing pipe, and a rotating riding wheel installed at the bottom of the slag pushing pipe. The flange cover is connected to the pipe body flange plate through a fastening bolt, the hydraulic cylinder body is used for connecting the cylinder body flange plate to the flange cover through a fastening bolt, and the hydraulic piston rod is hinged to the high-temperature-resistant slag pushing head. The device is large in thrust, reliable in connection, stable in operation, high in production efficiency, time-saving and labor-saving, low in labor intensity of operators, good in slag dredging effect, safe and reliable in operation and convenient to mount and dismount, and effectively solves the problems of slag accumulation, slag fluffing and slag blockage in a slag well. The deslagging device can be widely applied to the deslagging process of the coal-fired boiler slag well.

The invention relates to the technical field of water meter equipment, in particular to a metering mechanism of a horizontal helical vane type water meter, which comprises a flange cover, a bracket, an impeller, a rectifier, a central gear, a transmission gear set and a baffle plate, and a rotating shaft of the impeller is rotatably supported between the rectifier and the baffle plate. The first gear and the second gear are meshed with each other to form the first gear pair used for converting rotary motion of the impeller into rotary motion of the transmission gear shaft, the first gear pair can be effectively meshed under any working condition due to the fact that the first gear and the second gear are both involute cylindrical gears, and even if the impeller axially moves by 5 mm to the maximum, the first gear pair can be effectively meshed with the second gear pair. Due to the characteristics of the cylindrical gears, meshing of the cylindrical gears cannot be separated, only slight relative sliding in the tooth width direction exists, influences on transmission stability and efficiency are extremely small, the contact area of the cylindrical gears is far smaller than the sliding contact area between the worm gear and the worm, and friction resistance of the cylindrical gears can be remarkably reduced.

The utility model provides a detachable square tube box pressing device, which adopts an inner and outer double-module mechanical sealing structure and comprises an inner force bearing module, an outer force bearing module, an outer force bearing module, an inner force bearing module, an outer force bearing module, an inner force bearing module and an outer force bearing module, and is characterized in that the inner force bearing module is an adjustable I-shaped steel cross arm provided with a telescopic mechanism used for adapting to square tube boxes with different widths; the dynamic sealing module comprises a sealing plate, a pull rod group and a quick-release flange assembly; the sealing plate and the flange cover are provided with pressure test interfaces which are used for connecting a pressure source and pressure detection equipment. The hydraulic telescopic arm has the advantages that the hydraulic telescopic arm structure of the adjustable I-shaped steel cross arm can quickly adapt to square tube boxes of different width specifications, and the traditional blind plate welding procedure is thoroughly eliminated; through the pull rod group and the quick-release flange assembly of the dynamic sealing module, the test device can be quickly mounted and dismounted.

The utility model relates to sulfur recovery equipment technical field, specifically a spring formula sulfur seal device, including inner cylinder, the inner cylinder is connected liquid sulfur entrance inner connector and liquid sulfur export inner connector respectively, the inner cylinder inside is provided with the plunger, and the inner cylinder inside fixedly connected with plunger seat, plunger seat sets up in the lower part of plunger, and the plunger blocks liquid sulfur export inner connector, and the inner cylinder top sets up cylinder top flange cover, and the cylinder top flange cover slidingly connects with the limiting rod, and the limiting rod penetrates cylinder top flange cover and extends into the inside of inner cylinder, the limiting rod is connected with plunger, and the spring is movably sleeved outside the limiting rod. In the utility model, when the plunger lower part cavity pressure increases, the plunger and spring, limiting rod etc. move upward under the action of pressure, when the spring moves to the inner cylinder top, the plunger extrudes the spring, when reaches certain setting pressure value, the plunger bottom is higher than liquid sulfur export inner connector, makes liquid sulfur flow.

The utility model provides a kind of planetary gear reduction motor, including motor, still including the reduction component being connected with motor;Motor shaft of motor is processed with sun gear, planetary carrier is rotatably connected with planetary gear, and planetary gear is engagedly connected with sun gear and gear ring;First ladder is provided on the outer wall of planetary carrier, first bearing is installed at first ladder, first recess is opened in the inner wall of output flange cover, the inner wall of gear ring is provided with second recess, after output flange cover is connected with gear ring, first bearing is located in first installation groove.The utility model in the present application cancels the radial force received by planetary gear by first bearing, effectively avoids that planetary gear bears additional radial load.Through the radial force risk of offsetting planetary gear, the vibration and noise caused by uneven stress can be greatly reduced, the overall reliability of the system is effectively improved, and the failure probability caused by component wear is reduced.

The efficient baffling acid mist catching device comprises a mist catcher box body (1), a process pipeline outlet (2) and a process pipeline inlet (3), a top cover (15) is fixedly arranged at the top of the mist catcher box body (1); a connecting pipe (4) and a baffle plate box body (5) are arranged at the top of the top cover (15); an upper flange (8) is arranged at the top end of the connecting pipe (4); a flushing port connecting flange (9) is arranged at the upper end of the upper flange (8); a flushing pipe (10) is arranged in the center of the flushing port connecting flange (9); the flushing pipe (10) is provided with a plurality of spray heads (12); a box body flange (16) is arranged on the edge of the upper end of the baffle plate box body (5); a flange cover plate (6) is arranged at the top of the box body flange (16); a baffling mist catching plate (11) is arranged on the lower surface of the flange cover plate (6); and after being blocked by the baffle plate, small-particle-size fog drops are discharged into the emptying groove, so that equipment is protected from being corroded. Meanwhile, the flushing pipe (10) and the baffling mist catching plate (11) are both detachable equipment, so that the flushing pipe (10) and the baffling mist catching plate (11) are more convenient to replace and clean.

This invention provides a flat gate valve and its usage method, relating to the field of natural gas development technology. The valve includes a valve body, a valve cover, and a tail cover, all three having a longitudinal cavity at their center. The valve body has inlet and outlet ends on both sides, forming a flow channel. A flange cover is located above the valve cover, housing a valve stem and a valve plate connected within it. A large handwheel extends from the top of the valve stem to the outside of the flange cover, driving the valve plate to open and close. A valve stem cover and a ball screw cover are located inside the flange cover. The valve stem cover and the ball screw cover are fixedly connected and rotatable. A nut is fixed inside the ball screw cover, and a ball screw is fitted inside the nut. A retaining ring is connected to the top of the ball screw, matching the inner diameter of the ball screw cover. The large handwheel drives the ball screw cover to rotate, thereby causing the nut to move up and down. The valve stem is connected to the bottom of the ball screw via a pin, achieving precise adjustment and opening / closing of the valve. This invention has good operability and spatial adaptability, while also facilitating the user's observation of the opening / closing position.

To provide a screw fastening structure using a flange cover which implements prevention of galvanic corrosion in a fastening structure for a screw with high versatility.SOLUTION: A screw fastening structure (TK) using a flange cover comprises: a conductive screw member (2); a flange cover (1) mounted at a peripheral edge of a flange (22) or a head (21) of the screw member; a substrate (4) including a first through hole (4b) that a shank (23) of the screw member can pass; a conductive plate (3) including a second through hole (31a), that the shank can pass, electrically connected to a wiring pattern (4c) and disposed on the side of a first face (4e) of the substrate; and a female screw member (5) disposed on the side of a second face (4f) of the substrate. In a screw fastened state where the screw member to which the flange cover is mounted is passed through the second through hole and the first through hole and threaded to the female screw member (5), the flange or the head of the screw member is in contact with the plate in a contact portion, and the flange cover is adhered to the substrate or the plate while enclosing the contact portion.SELECTED DRAWING: Figure 2B

The application relates to a cast shell type EGR cooler which comprises an air inlet joint connected with an elastic structure with a bellows and a sleeve, the outer periphery of the elastic structure is fixedly connected with an input end flange cover, the input end flange cover is bolt-connected with one end of a cast pipe shell through an input end sealing gasket, the other end of the pipe shell is bolt-connected with a fixed structure and an output end flange cover with an output pipe joint through an output end sealing ring; the elastic structure is welded with a tube plate at one end of a tube bundle, and the other end of the tube bundle is welded with the fixed structure. One end of the tube bundle is provided with the fixed structure, and the other end is provided with the elastic structure, so that the dislocation between the pipe shell and the tube bundle due to thermal expansion and cold shrinkage is solved; the flexible structure of the double-layer bellows is used for compensating the axial displacement of a heat exchange core, the influence of thermal expansion and cold shrinkage on the heat exchange core is reduced, the double-layer bellows is placed at the air inlet end, the water inlet structure of the shell is combined, the water flow space is increased, and the uniformity of water flow is ensured.

The utility model discloses a support mechanism for a shield, which is used for being connected between a shell of an electric tool and the shield and comprises a flange body (1) used for being connected with the shell of the electric tool and provided with a step portion (11) protruding outwards in the radial direction. The step part is used for providing supporting force in the axial direction for the protective cover; the flange cover plate (2) is connected with the flange body, and the flange cover plate is used for being connected with a protective cover of the electric tool; the annular elastic supporting piece (3) is arranged on the step portion of the flange body, and the elastic supporting piece is used for exerting tensioning force on the protective cover in the radial direction and the axial direction in the assembled state.