CN101209770A - Bulk loading powder article tank truck self-sealing manhole cover - Google Patents
Bulk loading powder article tank truck self-sealing manhole cover Download PDFInfo
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- CN101209770A CN101209770A CNA2007101689632A CN200710168963A CN101209770A CN 101209770 A CN101209770 A CN 101209770A CN A2007101689632 A CNA2007101689632 A CN A2007101689632A CN 200710168963 A CN200710168963 A CN 200710168963A CN 101209770 A CN101209770 A CN 101209770A
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Abstract
The invention discloses a prill powder matter tank car self-sealing manhead. The manhead essentially comprises a manhead ring, a top cover and a fixed pressure pad assembled and welded as a whole, and a rubber band fixed on the lower surface of the fixed pressure pad through a bolt nut and a chuck ring, etc. The rubber band consists of an upper wing surface with a rectangle section, a side elevation and a lower wing surface with an isopachous section and an external extending side. The whole section of the invention is in a reverse J shape. The upper wing surface and the side elevation are connected by right angle. The side elevation and the inner side of the lower wing surface are connected through an enhanced round angle or an enhanced chamfer angle. The lower surface of the end part of the inside of the lower wring surface is provided with a sealing flange. The external extending side of the lower wing surface takes a shape of bending outwards and upwards at the right angle and is locked tightly on the bottom part of the manhead ring and the side surface at the lower part of the external side. The invention has the advantages of high rigidity and intensity, good sealing effect and high bearing capacity. The invention is especially applicable to a railway prill powder matter tank car.
Description
Technical field
The present invention relates to the manhole equipment on the bulk loading powder article tank truck, refer to a kind of bulk loading powder article tank truck self-sealing manhole cover particularly.
Background technology
At present, the manhole great majority on the China railways vehicle bulk loading powder article tank truck still adopt traditional self sealss form, the history in existing more than 30 year.Its structure mainly is made up of manhole collar and manhole cover, and the manhole collar is by the manhole seat ring and hold the decorative cover assembly welding and form, and is welded on the tank body.Manhole cover is made up of manhole decorative cover, top cover, fixation clip, seal ring and pressure ring etc., and seal ring is fixed on the fixation clip with bolt and nut by pressure ring.One end of manhole cover is connected by shipping and reselling on another market on manhole collar's the journal stirrup, the pin that can rotate rotation.After manhole cover was closed, the other end compressed it by twist lock, and seal ring can be fitted in and hold on the decorative cover like this.
Its basic functional principle is: after reaching certain numerical value for the gas filed air pressure of tank body, manhole cover seal ring compresses manhole and holds decorative cover under the effect of pressure, thereby makes manhole realize self sealss.For the railway bulk cement carrier, its pressure that can bear is about 0.35MPa, is higher than the pressure of the about 0.25MPa of general bulk cement carrier.The manhole of this structure is stamped low cost of manufacture, simple to operate, durable in use, advantage such as maintenance workload is little, the original design situation and create conditions constant and situation that customer requirements is not high under, can satisfy operating needs basically.
But still there are some weak points in above-mentioned manhole cover: when the jar internal pressure is lower than certain numerical value, manhole is sealed well.When making or be equipped with difference or problem such as manhole cover distortion in use occurs, manhole also often occurring can not fine leak free phenomenon.In tank body being carried out water test or the actual process of using, when pressure is less than 0.2MPa often, have certain leakage; And after pressure is brought up to more than the 0.6MPa, rubber seal under high-voltage effect through regular meeting from manhole cover with hold and rout up between the decorative cover, cause water test or actual use not to continue.Have the pulvis of strong abrasion action for some, for example alumina powder can strengthen the wearing and tearing of holding decorative cover and seal ring under the situation of often leaking out, and sealing effectiveness is obviously descended, and has a strong impact on drawing off of powder thing.Particularly at concentrated phase alumina powder tank car, require the working pressure of tank body to reach 0.5MPa, traditional manhole cover uses very reluctantly on such tank car.
Trace it to its cause: the conventional seals circle is that the cross section is the rubber ring of groove shape, is made up of top airfoil, side elevation and lower aerofoil, and wall thickness is about 5mm.Its top airfoil is fixed on the mounting ring of manhole cover by bolt and angle steel type pressure ring, makes whole rubber ring location.Its side elevation contacts with the inwall of manhole decorative cover, rises outward to prevent rubber ring.Its lower aerofoil be certain leaning angle is arranged and from the root to the end shape of attenuation gradually, design is to wish that lower aerofoil can and hold decorative cover and fits tightlyer like this, can more easily be crushed on when the rubber ring pressurized and hold on the decorative cover, to realize good sealing.And actual conditions are: because the end of lower aerofoil is very thin, when rubber ring is shaped, be easy to wrinkling, so almost not applying power generation.When the side elevation bottom of holding decorative cover and rubber ring contacted, the end of its lower aerofoil usually upwarped, and did not fit, so usually gas leakage easily when the jar internal pressure is low.When the jar internal pressure is increased to certain numerical value, again because lower aerofoil is too thin, is easy to from manhole cover and holds the gap between the decorative cover and extrude, cause tank body gas to discharge in a large number.Simultaneously, be subjected to the restriction of prototectonics, the design rigidity and the intensity of traditional manhole cover are also inadequate, may produce nonvolatil structural distortion in the use, and this also is the reason that rubber ring is extruded easily when causing the manhole water test.In addition, rubber ring is fixed on the fixation clip by the angle steel type pressure ring, and its seal face is the undulate attitude after moulding, its side also is difficult to guarantee vertical, therefore, both increase the sealing difficulty of rubber ring lower aerofoil end, also the side elevation of rubber ring had not been played good supporting role.From calculating, the analog simulation to traditional manhole cover and rubber ring also confirmed the existence of above-mentioned phenomenon.So the design sealing property is better, it is extremely urgent to bear the higher manhole cover of pressure.
Summary of the invention
Aim of the present invention will overcome above-mentioned existing in prior technology defective exactly, provides that a kind of rigidity and intensity are big, good sealing effect, bearing capacity height and the simple bulk loading powder article tank truck self-sealing manhole cover that is easy to of processing.
For achieving the above object, the bulk loading powder article tank truck self-sealing manhole cover that the present invention is designed, main is manhole decorative cover, top cover and the fixation clip of one by assembly welding, and forms by the parts such as rubber ring that bolt and nut and pressure ring are fixed on below the fixation clip.The lower aerofoil that described rubber ring is the uniform thickness shape by the rectangular top airfoil in cross section and side elevation and cross section and has an outer extension edge is formed, and its global sections is the font of falling J.Link to each other by the right angle between described top airfoil and the side elevation, link to each other by strengthening fillet or reinforcing chamfer between described side elevation and the lower aerofoil inboard, be provided with sealing flange below the described lower aerofoil medial end, the cross sectional shape of described sealing flange can be a kind of in semicircle, quadrntnt shape, triangle, rectangle or the polygon.The outer extension edge of described lower aerofoil is the shape of turning back in the right angle that outwards makes progress, and lock ring is engaged on the bottom and outer lower portion wall of manhole decorative cover.
Further, offer sealed groove on the outer lower portion wall of described manhole decorative cover, the corresponding position of the outer extension edge of described lower aerofoil is provided with the seal boss that can embed in the described sealed groove, can make like this rubber ring better lock ring on the manhole decorative cover, also can make the manhole cover circle better tractive live rubber ring, to guarantee sealing effectiveness.
Further, be provided with knuckle above the end of described lower aerofoil, this knuckle is corresponding with sealing flange, can coordinate the elastic deformation of sealing flange, strengthens the sealing effectiveness of sealing flange.
Further, the ratio of the radical length of described lower aerofoil and top airfoil is 3/5～4/5; Described lower aerofoil upper uplifting angle with respect to the horizontal plane is 0～3 °.The length of design lower aerofoil slightly is shorter than top airfoil, and gives its small upper uplifting angle, and the antagonistic force that is produced in the time of can strengthening its pressurized is guaranteed its sealing effectiveness.
Further, described pressure ring adopts face-flange formula pressure ring, can suitably move down fixation clip like this and it is widened thickening, to improve manhole cover steel structure intensity and rigidity, increases its bearing capacity.
The invention has the advantages that: the outer extension edge lock ring of designed rubber ring lower aerofoil is at the bottom and the outer lower portion wall of manhole decorative cover, and the packing interaction by outer extension edge back seal boss and manhole decorative cover back seal groove, make rubber ring when normal working, be close to manhole decorative cover inboard, and bondsman's port lid also keeps its original confined state well when closing, to guarantee good sealing effectiveness.
The designed rigidity that can effectively improve the lower aerofoil root at the reinforcement fillet or the reinforcing chamfer of side elevation and lower aerofoil inboard, the lower aerofoil of designed uniform thickness shape also can effectively improve himself resistance to bending, has so just obviously strengthened lower aerofoil and the applying contact force of holding decorative cover.Designed sealing flange below the lower aerofoil end can guarantee rubber ring all the time the end with hold decorative cover and contact, and because area of contact significantly reduces, can directly improve itself and the contact pressure that holds decorative cover, change into the line contact by the face contact simultaneously, make rubber ring can produce bigger contact pressure under manhole cover deadweight effect, it contacts better effects if.And the lower aerofoil of uniform thickness shape and the sealing flange below the end thereof can effectively increase the stretch-proof area of lower aerofoil, directly improve the ability of pressing in its opposing, thereby make seal ring can bear higher pressure.
In addition, change the pressure ring of original angle steel type into face-flange formula pressure ring, the space of being saved is used for suitably widening thickening and moves down fixation clip, not only simplify the structure and production technology, and the rigidity and the intensity of manhole cover have effectively been strengthened, also can easily rubber ring be pressed on the fixation clip, prevent the generation of leakage phenomenon.
Description of drawings
Fig. 1 is the package assembly scheme drawing of bulk loading powder article tank truck self-sealing manhole cover of the present invention;
Fig. 2 is the A portion structure for amplifying scheme drawing among Fig. 1;
Fig. 3 is the assembling structure for amplifying scheme drawing of traditional manhole cover and seal ring;
Fig. 4 is traditional manhole cover simulation calculation deformation pattern under the pressure effect in 0.70MPa;
Fig. 5 is traditional manhole cover simulation calculation stress system under the pressure effect in 0.35MPa;
Fig. 6 to Fig. 9 be the conventional seals circle when holding decorative cover and move 4mm, 8mm, 11mm and 12mm on respectively itself and hold simulation calculation contact area and footprint pressure figure between the decorative cover;
Figure 10 to Figure 11 is that the conventional seals circle is pressed when being respectively 0.15Mpa, 0.35MPa it and held simulation calculation contact area and footprint pressure figure between decorative cover, the manhole decorative cover in tank body;
Figure 12 is that the seal boss on the outer extension edge of rubber ring lower aerofoil of the present invention is embedded into simulation calculation contact area and the footprint pressure figure in the sealed groove on the manhole decorative cover;
Figure 13 to Figure 14 be rubber ring of the present invention when holding decorative cover and move 4mm and 11mm on respectively itself and hold simulation calculation contact area and footprint pressure figure between the decorative cover;
Figure 15 is that rubber ring of the present invention is pressed when the 0.35Mpa it and held simulation calculation contact area and footprint pressure figure between decorative cover, the manhole decorative cover in tank body.
The specific embodiment
Below in conjunction with the drawings and specific embodiments bulk loading powder article tank truck self-sealing manhole cover of the present invention is described in further detail:
As shown in Figure 1, the self-sealed manhole of bulk loading powder article tank truck mainly is made up of manhole collar and manhole cover two parts of the present invention.The manhole collar by manhole seat ring 10, hold decorative cover 9, ship and resell on another market support plate 17 and twist lock support plate 18 assembly weldings form, and are weldingly fixed on the tank body 11.Manhole cover is made up of parts such as manhole decorative cover 2, top cover 5, fixation clip 4, pressure ring 7 and rubber rings 6, pressure ring 7 adopts face-flange formula pressure ring, fixation clip 4 can be widened thickening 1～3mm on the basis of conventional size, its installation site also can move down 8～10mm on the basis of conventional size.Manhole decorative cover 2, top cover 5 and fixation clip 4 assembly weldings are one, by bolt and nut 3 and pressure ring 7 rubber ring 6 are assembled on the fixation clip 4.One end of manhole cover 1 is connected on manhole collar's the support plate 17 of shipping and reselling on another market by shipping and reselling on another market, and the manhole cover pin 1 that can rotate rotates freely like this, to open and close manhole.When manhole is closed, plugs twist lock 8 and can compress manhole cover.At this moment rubber ring 6 with hold decorative cover 9 and fit tightly, can make manhole be in sealing state.
As shown in Figure 2, the lower aerofoil 15 that rubber ring 6 of the present invention is the uniform thickness shape by the rectangular top airfoil 12 in cross section and side elevation 13 and cross section and has an outer extension edge 23 is formed, and its global sections is the font of falling J.Link to each other by right angle 20 between top airfoil 12 and the side elevation 13, link to each other by strengthening fillet or reinforcing chamfer 14 between side elevation 13 and lower aerofoil 15 inboards.Be provided with sealing flange 16 below lower aerofoil 15 medial ends, the cross sectional shape of sealing flange 16 is a kind of in semicircle, quadrntnt shape, triangle, rectangle or the polygon.Be provided with knuckle 19 above lower aerofoil 15 medial ends.Lower aerofoil 15 inboards are 3/5～4/5 with the ratio of the radical length of top airfoil 12.And lower aerofoil 15 upper uplifting angle with respect to the horizontal plane is designed to 0～3 °.
The outer extension edge 23 of lower aerofoil 15 is the shape of turning back in the right angle that outwards makes progress, and lock ring is engaged on the bottom and outer lower portion wall of manhole decorative cover 2.Wherein: offer sealed groove 21 on the outer lower portion wall of manhole decorative cover 2, sealed groove 21 is circular arc, and its arc radius is 3～5mm, and the circular arc degree of depth is 1～1.5mm.Design has the seal boss 22 that can embed in the sealed groove 21 on the corresponding position of the outer extension edge 23 of lower aerofoil 15, seal boss 22 also is cooresponding circular arc, the home position of its home position and sealed groove 21 is to bias internal 0.3～0.5mm, that is to say that its home position is slightly less than the home position of sealed groove 21 on radial dimension, so that rubber ring 6 lock rings are on manhole decorative cover 2.
This shows that under the situation that manhole cover of the present invention is pressed, because gas pressure on the medial surface of rubber ring 6, makes the big more rubber ring 6 of pressure also big more with the footprint pressure of its corresponding contact surface, sealing is just tight more like this in bearing.When increased pressure, rubber ring 6 rises outside the meeting under the effect of interior pressure, the distortion that the lower aerofoil 15 of its uniform thickness and sealing flange 16 can provide enough big tension sectional area to cause with renitency.Simultaneously, actually because sectional area increases reduced manhole decorative cover 2 and held the gap of decorative cover 9 in short transverse, also effectively avoided rubber ring 6 from manhole decorative cover 2 with hold the phenomenon of extruding between the decorative cover 9 and take place, thus the integral body that has significantly improved rubber ring of the present invention hold in pressure energy power.
As shown in Figure 3, be assembled on the manhole cover be conventional seals circle 6 ', its top airfoil 12 ' and side elevation 13 ' cross sectional shape also be rectangle, its lower aerofoil 15 ' shape certain leaning angle is arranged, and attenuation comes to a point gradually from the root to the end, the textural difference of obviously visible itself and rubber ring of the present invention 6.
For further analyzing and compare the sealing effectiveness of rubber ring of the present invention, adopt the ANSYS finite element analysis software below, provide the analog simulation result of calculation of doing at traditional manhole cover, conventional seals circle and rubber ring of the present invention respectively:
One. the static strength of traditional manhole cover steel structure and rigidity simulation calculation
As shown in Figure 4, under the operating mode that the tradition manhole cover is pressed in bearing 0.70MPa, can produce certain deformation, wherein maximum distortion is in the both sides of traditional manhole cover, 3.23mm is arranged approximately, make original circle become ellipse, and toward upwarping, the gap of its sidepiece obviously increases than fixed end, so seal ring is extruded from both sides mostly easily.
As shown in Figure 5, under the operating mode that the tradition manhole cover is pressed in bearing 0.35MPa, can produce certain distribution of stress changes, wherein maximum stress is distributed in the inboard on fixation clip both sides, 257.97MPa is arranged approximately, illustrate that fixation clip has born bigger power, for bigger effect has been played in the distortion of opposing manhole cover.
Two. the conventional seals circle is in simulation calculation under the closed condition at manhole cover
Because it is all the same that seal ring prolongs each cross section of hoop, and prolong hoop and bear the same support and external force, can represent the force-bearing situation of whole seal ring on mechanics with the Mechanics Calculation of an one section, this is called axisymmetric problem on mechanics.Following diagrammatic sketch is any one cross section stressed and distortion situation under external force of seal ring.
Because the mechanical property of elastomeric material obviously is different from common iron, elastomeric material is called as the super material that plays.Seal ring itself adopts elastomeric material to make, its top airfoil is fixed on the fixation clip by pressure ring and bolt and nut, the inboard of its side elevation contacts with pressure ring, the outside contacts with the manhole decorative cover, its lower aerofoil contacts with holding decorative cover, and the size of its actual contact amount is determined by the stressed and deformation state of rubber seal fully.Therefore, in model calculates, top airfoil is fixed, the surface that its side elevation and lower aerofoil are contacted with steel adopts osculating element to simulate respectively.
After two articles came in contact, the footprint pressure that is bound between them produce if there is not footprint pressure between the contact surface, just can be thought not contact between them.So, when investigating two object contact tightness degree, mainly be the contact pressure size of seeing between them.
Suppose to hold when just beginning decorative cover and do not contact, allow then and hold decorative cover and move on slowly, in such process, observe rubber seal and hold the variation of contact area position and size between the decorative cover with lower aerofoil, and the variation of contact pressure size.
As shown in Figure 6, hold and move 4mm on the decorative cover, make the conventional seals circle produce distortion after, the zone of its contact is basically in the end of lower aerofoil, its maximum contact pressure is about 0.0142MPa.
As shown in Figure 7, hold and move 8mm on the decorative cover, after making the conventional seals circle produce distortion, can find out obviously that its contact area begins outwards to move, the end of seal ring is in the contact, and this is mainly because move along with holding on the decorative cover, and the outside of lower aerofoil also begins and holds decorative cover and contact, and under the effect of holding decorative cover, deform, owing to having broken away from the end, the distortion of root holds decorative cover.Its maximum footprint pressure is about 0.016MPa.
As shown in Figure 8, hold and move 11mm on the decorative cover, the cylindrical that hold decorative cover this moment just in time contacts with the lower surface of seal ring, after making the conventional seals circle produce distortion, its contact area continues to move laterally, and the root of seal ring obviously bends, and its maximum contact pressure is about 0.0142MPa, but the zone of contact has increased, and the seal ring end has more zone to leave to hold decorative cover.
As shown in Figure 9, hold and move 12mm on the decorative cover, make the conventional seals circle produce distortion after, just in the outermost of seal ring, its side elevation bending is even more serious basically for its contact area.Because the distortion of root, make the most of zone of lower aerofoil all not with hold decorative cover and contacted.When pressing in really having like this, it is that interior pressure is born on the two sides basically that seal ring leaves the part of holding decorative cover.
By analysis, can draw as drawing a conclusion to above simulation calculation:
(1) when just beginning to contact, generally be the preceding end in contact (see figure 6) of seal ring, along with relative distance is more and more littler, contact range also moves gradually backward, and the end of seal ring lower aerofoil begins to upwarp, and holds decorative cover and separates.
(2) in the process of contact, contact pressure is between 0.014～0.016MPa, and the little reason of contact pressure is that lower aerofoil is too thin.
(3) the root distortion that crosses of seal ring side elevation and lower aerofoil is very big, obviously to center curvature, root rigidity deficiency is described.
(4) in manhole cover stack-mounted process, to assemble tightly more, its self sealss effect is poor more.
Above-mentioned theory the analysis showed that: the needs of the structure of conventional seals circle and incompatibility actual loading and distortion situation.Because the end of its lower aerofoil is too thin, after being shaped, seal ring tends to occur gauffer, directly influenced the sealing effectiveness of seal ring.When firmly big more, lower aerofoil upwarps also big more, and its contact pressure there is no obvious increase (pressure increase shown in Figure 9 is because the footprint pressure that the side elevation of seal ring is produced by vertical extruding).
Three. the conventional seals circle is the simulation calculation under the pressure condition in bearing
Suppose that seal ring finishes the self sealss of manhole cover gradually under interior pressure effect, the outer rim that hold decorative cover this moment just contacts with the bottom of seal ring.
As shown in figure 10, press in the tank body to be 0.15Mpa, after seal ring began to bear pressure, seal ring begin outwards distortion under the effect of interior pressure, and its lower aerofoil begins to overcome and holds friction force between the decorative cover and mobile laterally.Because original distortion upwarps the end of lower aerofoil, have only partial sum to hold the decorative cover contact, so the two sides, end of lower aerofoil all be subjected in the pressure effect, do not play self-packing effect.
As shown in figure 11, when pressure in the tank body reached 0.35Mpa, along with the rising of interior pressure, seal ring overcome friction gradually outwards moved, and finally contacts with holding decorative cover fully, and manhole is sealed fully, has played self-packing effect.And the side elevation of seal ring is also fitted fully with the manhole decorative cover.
Four. the conventional seals circle produces the leakage reasons analysis
Can find by above-mentioned simulation calculation, when just beginning because the end of conventional seals circle with hold decorative cover and separate, all there is pressure on its two sides, so the zone that seal ring is pressed in bearing is very little.When there were error in manhole cover manufacturing or assembling, manhole just had leakage.The place that the distortion of seal ring root is big more, suffered interior pressure is also more little, and the situation of leakage is just serious more.After seal ring is closed, generally be ship and resell on another market and the twist lock two ends stressed bigger, so the end of seal ring lower aerofoil just upwarps morely herein, why Here it is ships and resell on another market and the easy leakage reasons in twist lock two ends.After manhole cover begins pressure-bearing, the both sides of manhole begin upwards and outwards distortion, make like this lower aerofoil end be easy to and hold decorative cover and fit that so the manhole both sides generally can not leaked when just having begun, the seal ring of two side areas and the closure effect of holding decorative cover are better than ships and resell on another market and the twist lock two ends.
Along with the increase of pressure, seal ring moves after gradually, and the zone of its closure increases, and suffered pressure increases, and the seal ability of seal ring also increases gradually.In water test, still there is leakage in some place, at this moment knocks manhole cover with wooden mallet, destroys some regional static friction face temporarily, and this place promptly outwards moves, immediately sealing.
After pressure was brought up to certain numerical value, seal ring was pressed to the manhole decorative cover fully, and is same because the both sides distortion is bigger, and manhole decorative cover and the gap of holding between the decorative cover also increase, reason that why seal ring is extruded from both sides easily that Here it is.
Five. rubber ring of the present invention is in simulation calculation under the closed condition at manhole cover
As shown in figure 12, it is the distribution of pressure that is produced in the sealed groove of seal boss lock ring on the manhole decorative cover on the outer extension edge of rubber ring lower aerofoil of the present invention, its seal boss has reached 0.953MPa to the pressure of sealed groove, and the bottom of manhole decorative cover has also been produced applying pressure.
As shown in figure 13, hold and move 4mm on the decorative cover, after making rubber ring of the present invention produce distortion, its contact area is basically in newly-designed lower aerofoil sealing flange part, because the rigidity of whole uniform thickness lower aerofoil is very big, adds the effect that involves of the outer extension edge of lower aerofoil, its integral rigidity has obtained significantly increasing, so its footprint pressure also significantly increases, and reaches 0.177MPa, be 12.46 times of footprint pressure among Fig. 6.
As shown in figure 14, hold and move 11mm on the decorative cover, the cylindrical that hold decorative cover this moment just in time contact with the lower surface of seal ring of the present invention, after rubber ring of the present invention being produced be out of shape, its contact area is at the sealing flange and root two places of lower aerofoil, but the pressure at sealing flange place is apparently higher than root.Wherein: the footprint pressure at sealing flange place is 0.315MPa, is 22 times of footprint pressure among Fig. 8.
As shown in figure 15, press in the tank body to be 0.35Mpa, because rubber ring of the present invention can guarantee that all the time the end of its lower aerofoil contacts well with holding decorative cover, so in case the life of cutting down output in having, interior pressure all can be born in the inboard of whole seal ring, can play self sealing action well from the beginning.And, because the sealing flange of rubber ring of the present invention has left thereafter zone and holds decorative cover, so the living pressure of cutting down output in this part all has sealing flange to bear, makes the pressure of sealing flange can reach 1.315MPa, it is a lot of to exceed the interior pressure of tank body itself, will produce good sealing effectiveness like this.Simultaneously, under the situation of corresponding positive pressure, its friction force also significantly increases, thereby can prevent well that rubber ring of the present invention is extruded both sides.
By the simulation calculation analysis of Figure 12 to Figure 15 as seen:
(1) after rubber ring of the present invention was set up sealing flange, sealing flange remained and holds the decorative cover closed contact;
(2) rubber ring of the present invention obviously increases at the footprint pressure at sealing flange place, and final pressure is about 0.315MPa, and is bigger 22 times than the footprint pressure of conventional seals circle;
(3) can guarantee in the process that seal ring of the present invention is pressed that whole all the time lower aerofoil inboard all is under pressure in bearing;
(4) seal ring of the present invention remains maximum at the pressure at sealing flange place, and is bigger 3.75 times than pressing in actual, can play sealing function well;
In sum, because the lower aerofoil rubber volume of rubber ring of the present invention obviously increases, and the outer extension edge of lower aerofoil is waled the manhole decorative cover tightly, so its hoop stretch-proof ability can significantly increase, make it be not easy from the gap, to extrude, also can bear higher interior pressure, thereby make fabulous sealing effectiveness of manhole cover maintenance and the voltage endurance capability of Geng Gao.
Claims (8)
1. bulk loading powder article tank truck self-sealing manhole cover, comprise that assembly welding is manhole decorative cover (2), top cover (5) and the fixation clip (4) of one, and be fixed on rubber ring (6) below the fixation clip (4) by bolt and nut (3) and pressure ring (7), it is characterized in that: the lower aerofoil (15) that described rubber ring (6) is the uniform thickness shape by the rectangular top airfoil in cross section (12) and side elevation (13) and cross section and has outer extension edge (23) is formed, and its global sections is the font of falling J; Link to each other by right angle (20) between described top airfoil (12) and the side elevation (13), link to each other by strengthening fillet or reinforcing chamfer (14) between described side elevation (13) and lower aerofoil (15) inboard, be provided with sealing flange (16) below described lower aerofoil (15) medial end; The outer extension edge (23) of described lower aerofoil (15) is the shape of turning back in the right angle that outwards makes progress, and lock ring is engaged on the bottom and outer lower portion wall of manhole decorative cover (2).
2. bulk loading powder article tank truck self-sealing manhole cover according to claim 1, it is characterized in that: offer sealed groove (21) on the outer lower portion wall of described manhole decorative cover (2), the corresponding position of the outer extension edge (23) of described lower aerofoil (15) is provided with the seal boss (22) that can embed in the sealed groove (21).
3. bulk loading powder article tank truck self-sealing manhole cover according to claim 2 is characterized in that: described sealed groove (21) is circular arc, and its arc radius is 3～5mm, and the circular arc degree of depth is 1～1.5mm; Described seal boss (22) also is cooresponding circular arc, and the home position of its home position and sealed groove (21) is to bias internal 0.3～0.5mm.
4. according to claim 1 or 2 or 3 described bulk loading powder article tank truck self-sealing manhole covers, it is characterized in that: described lower aerofoil (15) is provided with knuckle (19) above the medial end.
5. according to claim 1 or 2 or 3 described bulk loading powder article tank truck self-sealing manhole covers, it is characterized in that: the cross sectional shape of described sealing flange (16) is a kind of in semicircle, quadrntnt shape, triangle, rectangle or the polygon.
6. according to claim 1 or 2 or 3 described bulk loading powder article tank truck self-sealing manhole covers, it is characterized in that: described lower aerofoil (15) inboard is 3/5～4/5 with the ratio of the radical length of top airfoil (12).
7. according to claim 1 or 2 or 3 described bulk loading powder article tank truck self-sealing manhole covers, it is characterized in that: described lower aerofoil (15) upper uplifting angle with respect to the horizontal plane is 0～3 °.
8. according to claim 1 or 2 or 3 described bulk loading powder article tank truck self-sealing manhole covers, it is characterized in that: described pressure ring (7) is a face-flange formula pressure ring.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007101689632A CN100540415C (en) | 2007-12-20 | 2007-12-20 | The bulk powder tank truck self-sealing manhole cover |
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| CNB2007101689632A CN100540415C (en) | 2007-12-20 | 2007-12-20 | The bulk powder tank truck self-sealing manhole cover |
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| CN100540415C CN100540415C (en) | 2009-09-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| AU2011217119B2 (en) * | 2010-02-18 | 2016-09-29 | Ej Emea | Manhole cover having a frame and buffer provided with a damping and sealing gasket |
| CN112922462A (en) * | 2021-02-04 | 2021-06-08 | 合肥中辰轻工机械有限公司 | Intelligent interlocking anti-burst device for hole door of bottle washing machine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2011217119B2 (en) * | 2010-02-18 | 2016-09-29 | Ej Emea | Manhole cover having a frame and buffer provided with a damping and sealing gasket |
| CN112922462A (en) * | 2021-02-04 | 2021-06-08 | 合肥中辰轻工机械有限公司 | Intelligent interlocking anti-burst device for hole door of bottle washing machine |
| CN112922462B (en) * | 2021-02-04 | 2021-11-30 | 合肥中辰轻工机械有限公司 | Intelligent interlocking anti-burst device for hole door of bottle washing machine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100540415C (en) | 2009-09-16 |
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