CN110281449B - Anti-slip sealing ring for STD type interface of ductile cast iron pipe and production method thereof - Google Patents
Anti-slip sealing ring for STD type interface of ductile cast iron pipe and production method thereof Download PDFInfo
- Publication number
- CN110281449B CN110281449B CN201910729488.4A CN201910729488A CN110281449B CN 110281449 B CN110281449 B CN 110281449B CN 201910729488 A CN201910729488 A CN 201910729488A CN 110281449 B CN110281449 B CN 110281449B
- Authority
- CN
- China
- Prior art keywords
- tooth
- slip
- sealing ring
- ring body
- sealing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 125
- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 41
- 238000004519 manufacturing process Methods 0.000 title abstract description 9
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 238000004073 vulcanization Methods 0.000 abstract description 9
- 238000005496 tempering Methods 0.000 abstract description 6
- 238000010438 heat treatment Methods 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 4
- 238000010074 rubber mixing Methods 0.000 abstract description 3
- 238000003825 pressing Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 12
- 238000009434 installation Methods 0.000 description 10
- 238000002156 mixing Methods 0.000 description 10
- 238000001816 cooling Methods 0.000 description 6
- 238000010791 quenching Methods 0.000 description 6
- 230000000171 quenching effect Effects 0.000 description 6
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 230000002045 lasting effect Effects 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000000110 cooling liquid Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 2
- 230000036314 physical performance Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000005488 sandblasting Methods 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/18—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/52—Heating or cooling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
- F16J15/104—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by structure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
- F16J15/108—Special methods for making a non-metallic packing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L25/00—Constructive types of pipe joints not provided for in groups F16L13/00 - F16L23/00 ; Details of pipe joints not otherwise provided for, e.g. electrically conducting or insulating means
- F16L25/10—Sleeveless joints between two pipes, one being introduced into the other
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/18—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
- B29C2043/181—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles encapsulated
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Thermal Sciences (AREA)
- Joints With Sleeves (AREA)
Abstract
The invention discloses a slip-proof sealing ring for an STD type interface of a nodular cast iron pipe and a production method thereof, and relates to the technical field of sealing rings. The anti-slip sealing ring comprises an annular sealing ring body, wherein one end of the sealing ring body is provided with a Y-shaped sealing lip; the anti-slip sealing ring comprises a sealing ring body, and is characterized by further comprising at least two tooth blocks embedded in the sealing ring body, wherein anti-slip teeth are arranged on the front sides of the tooth blocks, are exposed from the inner wall of the sealing ring body, the tooth tips of the anti-slip teeth are obliquely directed to one end where a sealing lip is located, and positioning teeth are arranged on the tail parts of the rear sides of the tooth blocks. The production method of the anti-slip sealing ring comprises the steps of rubber mixing, hardening and tempering heat treatment, mould pressing, vulcanization and the like. According to the invention, the tooth blocks are arranged in the sealing ring body, and the structure of the tooth blocks is reasonably designed, so that the tooth blocks have a definite rotating track after being pressed, and have rotary orientation after rotation, so that the outer wall of a pipe fitting socket can be effectively meshed, the anti-drop performance is safe and reliable, the product consistency is high, and the defect that the existing STD sealing ring cannot be prevented from dropping is overcome.
Description
Technical Field
The invention relates to the technical field of sealing rings, in particular to a slip-preventing sealing ring for an STD type interface of a nodular cast iron pipe and a production method thereof.
Background
The ductile cast iron pipe is simply called a bulb pipe, a ductile iron pipe, a ductile graphite cast pipe and the like, and has the characteristics of iron nature, excellent steel performance, excellent corrosion resistance, good extensibility and simple installation, so that the ductile cast iron pipe is widely applied to engineering construction such as water supply, gas transmission, oil transmission and the like. When the ductile cast iron pipe is paved, most of interfaces such as steering, climbing and pipeline tail ends are connected by adopting a sliding-in type sealing structure with matched socket, sealing ring and socket, and the ductile cast iron pipe has the advantages of simple structure and quick and convenient installation; the disadvantage is that the fluid generates a high pressure in the pipeline, so that a pulling-out force is generated along the axial direction of the pipeline, and the pipeline is easy to loosen from the joint.
The conventional ductile cast iron pipe is generally connected by T-shaped flexible connection, wherein the ductile cast iron pipe comprises TYT-shaped interfaces and STD-shaped interfaces, and for the ductile cast iron pipe with the STD-shaped interfaces, the conventional sealing ring does not have anti-falling capability, so that the sealing safety of the pipeline interface is ensured, the traditional construction method needs to arrange reinforced concrete anti-thrust piers at the turning inflection points of the pipeline or at the tail ends of the pipeline, but the method is time-consuming and labor-consuming and high in cost, and the concrete anti-thrust piers after being installed need a certain maintenance time and cannot be immediately pressurized by water.
For example, chinese patent, application publication No.: CN 201858449U, application publication date: 2011.06.08 discloses a novel rubber sealing ring for a flexible joint of a super-large nodular cast iron pipeline, which is of an annular structure, and the profile line of the cross section shape of the rubber sealing ring is formed by closing a dovetail-shaped curve part at the upper part and line segments at the inner side, the outer side and the bottom. The STD type rubber sealing ring is made of vulcanized rubber with the Shore hardness of 60-80, does not have the anti-falling capability, and is required to be provided with an anti-falling pier to prevent the interface from loosening in the use process, so that the construction difficulty is high and the cost is high.
Disclosure of Invention
Technical problem to be solved by the invention
Aiming at the problem that the STD type sealing ring in the prior art does not have the anti-drop capability, so that an anti-drop pier needs to be built for anti-drop, the invention provides the anti-drop sealing ring for the STD type interface of the nodular cast iron pipe and the production method thereof, which solve the defect that the existing STD type sealing ring cannot be used for anti-drop, and have the advantages of safe and reliable anti-drop performance and high product consistency.
Technical proposal
In order to solve the problems, the technical scheme provided by the invention is as follows:
The anti-slip sealing ring for the STD type interface of the nodular cast iron pipe comprises an annular sealing ring body, wherein one end of the sealing ring body is provided with a Y-shaped sealing lip; still including embedding at least two tooth pieces in the sealing washer body, the front side of tooth piece has anti-skidding tooth, anti-skidding tooth follows the inner wall of sealing washer body exposes, just the tooth point of anti-skidding tooth all inclines to the one end at sealing lip place, the rear side afterbody of tooth piece has the location tooth, through the location tooth bites the rubber rather than combining for the tooth piece in the sealing washer body can rotate around the location tooth at tooth piece afterbody when receiving the pipe fitting socket extrusion.
Further, the back side back of the tooth block is a corrugated surface, so that the adhesive force between the tooth block and rubber is enhanced, the tooth block is prevented from being separated from the rubber after being forced to rotate, and the anti-falling reliability and the sealing safety are improved.
Further, the front side of the tooth block is also provided with a bulge, the bulge is positioned in the reverse direction of the pointing direction of the tooth tip of the anti-slip tooth, the tooth block is driven to rotate when the pipe fitting socket is inserted, the bulge extrudes the rubber on the front side of the tooth block, the extruded rubber rebounds after being installed in place and extrudes the bulge, so that the tooth block has the reverse transfer toward direction, and the anti-slip tooth on the tooth block is enabled to be more easy to bite the outer wall of the pipe fitting socket.
Further, the anti-slip teeth are provided with 3-6 tooth points, so that the anti-slip teeth can be meshed with the outer wall of the pipe fitting socket in the area where the tooth block rotates around the positioning teeth at the tail part.
Further, the tooth points of the anti-slip teeth are distributed on the same section of circular arc, and the arc length between any two adjacent tooth points of the anti-slip teeth is equal, so that the tooth edge of the anti-slip teeth rolls along the outer wall of the pipe fitting socket in the rotation process of the tooth block, the tooth points in the middle and the tooth points on the two sides have opportunities to contact and bite the pipe wall, and the anti-slip effect is better.
Further, the central angle corresponding to the circular arc where the tooth tip of the anti-slip tooth is positioned is 45 degrees or more and is not more than 50 degrees, so that at least two tooth tips are enabled to 'bite' the outer wall of the pipe fitting socket when the tooth block deflects, and the anti-slip performance of the nodular cast iron pipe joint is safer and more reliable.
Further, the sealing ring body is provided with a tapered section inner wall tapered towards one end where the sealing lip is located, the tapered section inner wall and a clamp of the outer wall of the sealing ring body are 20 degrees or more and less than or equal to beta or less than or equal to 24 degrees, the anti-slip teeth are exposed from the tapered section inner wall, in the inserting process of the pipe fitting socket, the sealing ring body is gradually extruded, the tooth block is enabled to have a rotation angle of 3-5 degrees, meanwhile, the sealing ring body is extruded, the Y-shaped sealing lips are pressed together, and the sealing lips tend to be opened, so that the sealing performance is better.
Further, the tooth blocks are uniformly distributed around the axis of the sealing ring body, so that the tooth blocks and the meshed area of the pipe fitting socket are uniformly distributed around the pipe wall, and the anti-falling performance is safer and more reliable.
Further, the tooth block is made of stainless steel, the Rockwell hardness of the tooth block is 46-54, the tooth block is not rusted and is not easy to wear, the anti-slip tooth (12) can be meshed into the wall of the ball ink casting tube, and the tooth block still has good anti-slip and anti-slip capability after long-term use, and is good in anti-slip and anti-slip durability and durable.
A production method of a slip-proof sealing ring for an STD type interface of a nodular cast iron pipe comprises the following steps:
1. rubber mixing:
and (i) plasticating: plasticating raw rubber by adopting an open mill thin-pass plasticating process, and controlling the Mooney viscosity of the plasticated rubber to be 60+/-5 ML100 ℃ (1+4);
Ii, mixing: mixing plasticated rubber in an internal mixer, adding zinc oxide and stearic acid, and mixing for 30 seconds; adding carbon black, and continuously mixing for 60 seconds; adding a softener, an accelerator and sulfur, continuously mixing for 30 seconds, and discharging rubber; finally, uniformly turning over on an open mill, and then discharging, wherein the dispersion degree of the mixed rubber is controlled to be more than or equal to 5.0;
2. Carrying out quenching and tempering heat treatment on the tooth block:
Heating the tooth block to 1050 ℃, and preserving heat for 6 minutes;
ii, quenching the heated tooth block, controlling the temperature of quenching oily cooling liquid to be 100 ℃ and the kinematic viscosity to be 30cst, and tempering the tooth block at 250 ℃ for 120 minutes to enable the Rockwell hardness of the tooth block to reach 46-54;
iii, carrying out sand blasting and shot blasting treatment on the tooth block to ensure that the surface roughness Ra of the tooth block is more than or equal to 85 mu m;
3. Molding and vulcanizing:
placing the tooth block on a fixed tooth seat in a die cavity of a die, and then injecting a rubber compound into the die cavity;
Ii, sequentially performing preforming, vulcanization and cooling treatment to obtain a finished product of the anti-slip sealing ring; wherein: the preforming pressure is 7MPa, and the preforming time is 6 seconds; the vulcanization pressure is 10MPa, the vulcanization time is 1680 seconds, and the vulcanization temperature is 170+/-3 ℃; cooling time is 360 seconds, and the temperature of the die is 110+/-10 ℃ after cooling.
Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) According to the anti-slip sealing ring for the STD type interface of the nodular cast iron pipe, the tooth blocks are arranged in the STD type sealing ring body, and the tooth blocks are provided with the determined rotating track after being pressed by reasonably designing the structure of the tooth blocks, so that the tooth blocks have the rotating orientation after rotating, can be effectively engaged with the outer wall of the pipe fitting socket, the anti-slip performance is safe and reliable, the product consistency is high, and the defect that the existing STD type sealing ring cannot be prevented from slipping is overcome; because the Y-shaped sealing lip is arranged, the rotation resistance of the tooth block can be reduced, and the resistance of the pipe fitting socket inserted into the pipe fitting bell mouth is smaller, so that the pipe fitting socket is labor-saving when being butted with the pipe orifice, the installation difficulty is greatly reduced, and the installation efficiency is obviously improved;
(2) According to the anti-slip sealing ring for the STD type interface of the nodular cast iron pipe, the rear side back of the tooth block is set to be the corrugated surface, so that the adhesive force between the tooth block and rubber is enhanced, the tooth block is prevented from being separated from the rubber after being forced to rotate, and the anti-slip reliability and sealing safety are improved;
(3) According to the anti-slip sealing ring for the STD type interface of the nodular cast iron pipe, provided by the invention, the reversing trend of the tooth block is enhanced by arranging the bulge, so that the anti-slip teeth on the tooth block are easier to bite the outer wall of the pipe fitting socket, the biting depth is improved to some extent, and the anti-slip reliability is higher;
(4) According to the anti-slip sealing ring for the STD type interface of the nodular cast iron pipe, provided by the invention, the anti-slip teeth are provided with 3-6 tooth points, so that the anti-slip teeth can be meshed with the outer wall of the pipe fitting socket in the area where the tooth block rotates around the positioning tooth at the tail part, and the lasting anti-slip performance of the anti-slip sealing ring is improved;
(5) According to the anti-slip sealing ring for the STD type interface of the nodular cast iron pipe, the tooth tips of the anti-slip teeth are distributed on the same arc, the arc length between the tooth tips of any two adjacent anti-slip teeth is equal, the tooth edge of the anti-slip teeth rolls against the outer wall of a pipe fitting socket in the rotating process of a tooth block, when the rotating angle of the tooth block is 3-5 degrees, the tooth tip in the middle and the tooth tips on the two sides are in contact with each other and are engaged with the pipe wall, and the anti-slip effect is better;
(6) According to the anti-slip sealing ring for the STD type interface of the nodular cast iron pipe, provided by the invention, the central angle corresponding to the circular arc where the tooth tip of the anti-slip tooth is positioned is more than or equal to 45 degrees and less than or equal to 50 degrees, so that at least two tooth tips are enabled to 'bite' the outer wall of the socket of the pipe fitting when the tooth block deflects, and the anti-slip performance of the nodular cast iron pipe interface is safer and more reliable;
(7) The anti-slip sealing ring for the STD type interface of the nodular cast iron pipe provided by the invention has the advantages that the sealing ring body is provided with the inner wall of the tapered section which is tapered towards one end where the sealing lip is positioned, the clamp of the inner wall of the tapered section and the outer wall of the sealing ring body is 20 degrees or more and less than or equal to beta or less than or equal to 24 degrees, the anti-slip teeth are exposed from the inner wall of the tapered section, in the inserting process of the pipe fitting insertion opening, the sealing ring body is gradually extruded, the tooth block can have a rotating angle of 3-5 degrees, meanwhile, the sealing ring body is extruded, the Y-shaped sealing lips are pressed together, and the sealing lip tends to be opened, so that the sealing performance is better;
(8) According to the anti-slip sealing ring for the STD type interface of the nodular cast iron pipe, the tooth blocks are uniformly distributed around the axis of the sealing ring body, so that the engagement area of the tooth blocks and the pipe fitting socket is uniformly distributed around the pipe wall, and the anti-slip performance is safer and more reliable;
(9) The anti-slip sealing ring for the STD type interface of the nodular cast iron pipe provided by the invention has the advantages that the tooth block is made of stainless steel, the Rockwell hardness is 46-54, the nodular cast iron pipe is not rusted and is not easy to wear, the anti-slip teeth can be meshed into the pipe wall of the nodular cast iron pipe, and the anti-slip sealing ring still has good anti-slip and anti-slip capability after long-term use, has good anti-slip and anti-slip durability and is durable;
(10) According to the production method of the anti-slip sealing ring, the hardness level of the sealing ring body of the anti-slip sealing ring for the STD type interface of the ductile cast iron pipe produced by the method can reach IRHD 70+/-5, and the anti-slip sealing ring has excellent compression deformation and stress relaxation performance and stable physical performance; the elasticity and strength consistency of each part of the sealing ring body are high; the tooth block has high strength and moderate hardness, can be effectively meshed with the outer wall of the pipe fitting socket, and has high anti-falling reliability; the sealing ring body and the tooth block have good combination property, are not easy to separate, and have durable anti-falling capability.
Drawings
FIG. 1 is a schematic structural view of a slip-off prevention seal ring;
FIG. 2 is a schematic view of the structure of a tooth block;
FIG. 3, a schematic view of the arrangement of anti-slip teeth on a tooth block;
FIG. 4 is a schematic view of the state of the anti-slip seal ring in the spheroidal graphite cast iron pipe joint;
in the above figures: 1. a seal ring body; 11. a sealing lip; 2. tooth blocks; 21. anti-slip teeth; 22. a protrusion; 23. a corrugated surface; 24. positioning teeth; 3. a pipe fitting spigot; 4. and (3) a pipe fitting socket.
Detailed Description
The following detailed description of the embodiments of the invention, given by way of example only, is presented in the accompanying drawings to aid in a more complete, accurate and thorough understanding of the concepts and aspects of the invention, and to aid in its practice, by those skilled in the art.
As shown in fig. 1 and 2, a slip-off prevention seal ring for an STD type joint of a ductile cast iron pipe comprises a ring-shaped seal ring body 1, wherein one end of the seal ring body 1 is provided with a Y-shaped seal lip 11; the anti-slip sealing ring further comprises at least two tooth blocks 2 embedded in the sealing ring body 1, anti-slip teeth 21 are arranged on the front side of each tooth block 2, the anti-slip teeth 21 are exposed from the inner wall of the sealing ring body 1, tooth tips of the anti-slip teeth 21 are obliquely directed to one end where the sealing lip 11 is located, and positioning teeth 24 are arranged on the tail of the rear side of each tooth block 2.
The inventors originally used the tooth block in the TYT-type anti-slip seal ring in the STD-type seal ring, but found that the anti-slip performance of the seal ring after installation was extremely poor during the course of the study. Repeated verification and analysis reasons show that the rotation center of the tooth block 2 in the STD sealing ring is not fixed, the tooth block 2 is hard to rotate after being pressed and rotated, and the outer wall of the pipe fitting socket 3 can not be snapped, so that the produced anti-slip sealing ring has poor anti-slip capability consistency, and has basically no anti-slip capability. Further studies have found that this phenomenon is mainly caused by the fact that, in comparison with the TYT type interface of the ductile cast iron pipe, there is no boss in the STD type interface that provides a fulcrum for the tooth block 2, and thus the rotational state of the tooth block 2 cannot have a definite rotational locus like the tooth block in the TYT type anti-slip seal ring, resulting in that the rotational center of the tooth block 2 is not fixed, and it is difficult to bite the outer wall of the pipe socket 3. In this embodiment, the inventor sets up the location tooth 24 structure at tooth piece 2 afterbody, through the rubber that location tooth 24 bites and combines with it for tooth piece 2 in sealing washer body 1 can rotate around the location tooth 24 at tooth piece 2 afterbody when receiving pipe fitting socket 3 extrusion.
When the pipe joint is installed, the anti-slip sealing ring is installed in the pipe socket 4, then the pipe socket 3 is slowly inserted into the pipe socket 4, the pipe socket 3 extrudes the tooth block 2 to rotate, and extrudes the sealing ring body 1 to fold the Y-shaped sealing lip 11, and the pipe joint is installed in place as shown in fig. 4. When the pipe fitting insertion opening 3 tends to be pulled out, the tooth block 2 is driven to rotate reversely, and the anti-slip teeth 21 bite the outer wall of the pipe fitting insertion opening 3, so that the anti-slip performance of the pipe joint is realized.
The anti-slip sealing ring for the STD type interface of the nodular cast iron pipe has the advantages that the tooth block 2 is arranged in the STD type sealing ring body 1, and the tooth block 2 is provided with a determined rotating track after being pressed by reasonably designing the structure, and the rotating track has rotary orientation after rotation, so that the outer wall of the pipe fitting socket 3 can be effectively snapped, the anti-slip performance is safe and reliable, the product consistency is high, and the defect that the existing STD type sealing ring cannot be prevented from slipping is overcome; because the Y-shaped sealing lip 11 is arranged, the rotation resistance of the tooth block 2 can be reduced, and the resistance of the pipe fitting socket 3 inserted into the pipe fitting bell 4 is smaller, so that the pipe fitting is labor-saving when being in butt joint with the pipe orifice, the installation difficulty is greatly reduced, and the installation efficiency is obviously improved.
The back of the traditional anti-falling tooth block is designed to be a plane, and the back of the anti-falling tooth block is easy to separate from rubber when stressed and rotates, so that anti-falling failure is caused. In this embodiment, as shown in fig. 2, the back side of the tooth block 2 is provided with the corrugated surface 23, which can enhance the adhesion force between the tooth block 2 and rubber, avoid the separation of the tooth block 2 from the rubber after the rotation under force, and improve the anti-disengagement reliability and the sealing safety.
In addition, as shown in fig. 2, the front side of the tooth block 2 in the present embodiment also has a protrusion 22, the protrusion 22 being located in the opposite direction in which the tooth tip of the anti-slip tooth 21 is directed. When the pipe fitting socket 3 is inserted, the tooth block 2 is driven to rotate, rubber on the front side of the tooth block is extruded through the protrusion 22, the extruded rubber rebounds after the installation in place and extrudes the protrusion 22, the reverse trend of the tooth block 2 is enhanced, the anti-slip teeth 21 on the tooth block 2 are enabled to be more easily snapped on the outer wall of the pipe fitting socket 3, the biting depth is improved, and the anti-slip reliability is higher; in addition, the Y-shaped sealing lip 11 can compensate the installation resistance generated by the bulge 22, so that the labor is saved when the pipe orifice is butted, and the installation efficiency is less affected.
Preferably, the anti-slip teeth 21 are provided with 3-6 tooth points, so that the anti-slip teeth 21 can be meshed with the outer wall of the pipe fitting socket 3 in the rotating area of the tooth block 2 around the positioning teeth 24 at the tail part, and the lasting anti-slip performance of the anti-slip sealing ring is improved. In this embodiment, as shown in fig. 2 and 3, the anti-slip teeth 21 have 4 tooth tips, and each tooth tip can be engaged with the outer wall of the pipe fitting socket 3 in the forced drawing test, so that the effective utilization rate of the tooth tip is high.
As shown in fig. 3, the tooth tips of the anti-slip teeth 21 are distributed on the same arc, and the arc lengths between any two adjacent tooth tips of the anti-slip teeth 21 are equal, in this embodiment, the arc lengths L 1＝L2＝L3 corresponding to the 4 tooth tips are researched, and when the arc lengths corresponding to the adjacent tooth tips are the same, the inventor researches that the tooth edges of the anti-slip teeth 21 roll against the outer wall of the pipe fitting socket 3 in the rotation process of the tooth block 2, and when the rotation angle of the tooth block 2 is 3-5 °, the tooth tip in the middle and the tooth tips on both sides have a chance to contact and bite the pipe wall, so that the anti-slip effect is better.
As shown in fig. 3, the central angle corresponding to the circular arc where the tooth tip of the anti-slip tooth 21 is positioned is 45 degrees less than or equal to gamma degrees less than or equal to 50 degrees, so that at least two tooth tips are ensured to 'bite' the outer wall of the pipe fitting socket 3 when the tooth block 2 deflects, and the anti-slip performance of the spheroidal graphite cast iron pipe joint is safer and more reliable. In this embodiment, the central angle corresponding to the arc where the tooth tip of the anti-slip tooth 21 is located is preferably 47.5 °, and the depth of engagement with the outer wall of the pipe socket 3 is moderate, so that the pipe wall is not damaged, and the anti-slip tooth is applicable to a spheroidal graphite cast iron pipe with a thinner pipe wall.
In addition, as shown in fig. 1, the seal ring body 1 in this embodiment has a tapered section inner wall tapered toward the end where the seal lip 11 is located, the grip of the tapered section inner wall with the outer wall of the seal ring body 1 is 20 ° - β -24 °, and the anti-slip teeth 21 are exposed from the tapered section inner wall. In the pipe fitting socket 3 inserting process, the sealing ring body 1 is gradually extruded, the tooth block 2 can have a rotation angle of 3-5 degrees, meanwhile, the sealing ring body 1 is extruded, the Y-shaped sealing lips 11 are pressed together, and the sealing lips 11 tend to be opened, so that the sealing performance is better.
As shown in fig. 1, the tooth blocks 2 are uniformly distributed around the axis of the sealing ring body 1, so that the engagement area of the tooth blocks 2 and the pipe fitting socket 3 is uniformly distributed around the pipe wall, and the anti-falling performance is safer and more reliable. The number of the tooth blocks 2 in the sealing ring body 1 is selected according to the diameter of the sealing ring body 1, and the larger the diameter is, the more the tooth blocks 2 are required to be arranged, in this embodiment, as shown in fig. 1, the diameter of the sealing ring body 1 is about 200mm, 8 tooth blocks 2 are uniformly distributed in the sealing ring body, and 8 biting forces can be provided on the outer wall of the pipe fitting socket 3, which is a preferred scheme under the diameter.
In this embodiment, preferably, the tooth block 2 is made of stainless steel, and has a rockwell hardness of 46-54, so that the tooth block is not rusted and is not easy to wear, the anti-slip tooth 12 can be meshed with the wall of the spheroidal graphite cast tube, and the anti-slip and anti-slip cast tube still has good anti-slip and anti-slip capabilities after long-term use, and is good in anti-slip and anti-slip durability and durable.
The embodiment provides a production method of the anti-slip sealing ring for the STD type interface of the ductile cast iron pipe, which comprises the following specific steps:
1. rubber mixing:
and (i) plasticating: plasticating raw rubber by adopting an open mill thin-pass plasticating process, and controlling the Mooney viscosity of the plasticated rubber to be 60+/-5 ML100 ℃ (1+4);
Ii, mixing: mixing plasticated rubber in an internal mixer, adding zinc oxide and stearic acid, and mixing for 30 seconds; adding carbon black, and continuously mixing for 60 seconds; adding a softener, an accelerator and sulfur, continuously mixing for 30 seconds, and discharging rubber; finally, uniformly turning over on an open mill, and then discharging, wherein the dispersion degree of the mixed rubber is controlled to be more than or equal to 5.0;
2. Carrying out quenching and tempering heat treatment on the tooth block:
Heating the tooth block 2 to 1050 ℃, and preserving heat for 6 minutes;
ii, quenching the heated tooth block 2, controlling the temperature of quenching oily cooling liquid to be 100 ℃ and the kinematic viscosity to be 30cst, and tempering the tooth block 2 at the tempering temperature of 250 ℃ for 120 minutes to ensure that the Rockwell hardness of the tooth block 2 reaches 46-54;
Iii, carrying out sand blasting and shot blasting treatment on the tooth block 2 to ensure that the surface roughness Ra of the tooth block is more than or equal to 85 mu m;
3. Molding and vulcanizing:
Placing the tooth block 2 on a fixed tooth seat in a die cavity of a die, and then injecting a rubber compound into the die cavity;
Ii, sequentially performing preforming, vulcanization and cooling treatment to obtain a finished product of the anti-slip sealing ring; wherein: the preforming pressure is 7MPa, and the preforming time is 6 seconds; the vulcanization pressure is 10MPa, the vulcanization time is 1680 seconds, and the vulcanization temperature is 170+/-3 ℃; cooling time is 360 seconds, and the temperature of the die is 110+/-10 ℃ after cooling.
The anti-slip sealing ring for the STD type interface of the nodular cast iron pipe produced by the method has the advantages that the hardness level of the sealing ring body 1 can reach IRHD 70+/-5, the anti-slip sealing ring has excellent compression resistance and stress relaxation performance, and the physical performance is stable; the elasticity and the strength consistency of each part of the sealing ring body 1 are high; the tooth block 2 has high strength and moderate hardness, can be effectively meshed with the outer wall of the pipe fitting socket 3, and has high anti-falling reliability; the sealing ring body 1 and the tooth block 2 have good combination property, are not easy to separate, and have lasting anti-falling capability.
The invention and its embodiments have been described above by way of illustration and not limitation, and the invention is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present invention.
Claims (3)
1. The utility model provides a nodular cast iron pipe STD type interface is with preventing sealing washer that takes off, is annular sealing washer body (1) including being, the one end of sealing washer body (1) has sealing lip (11) of Y type, its characterized in that: the anti-slip sealing device is characterized by further comprising at least two tooth blocks (2) embedded in the sealing ring body (1), wherein anti-slip teeth (21) are arranged on the front side of each tooth block (2), the anti-slip teeth (21) are exposed out of the inner wall of the sealing ring body (1), tooth tips of the anti-slip teeth (21) are obliquely directed to one end where the sealing lip (11) is located, and positioning teeth (24) are arranged on the tail part of the rear side of each tooth block (2);
The back of the tooth block (2) is provided with a corrugated surface (23);
the front side of the tooth block (2) is also provided with a bulge (22), and the bulge (22) is positioned in the reverse direction pointed by the tooth tip of the anti-slip tooth (21);
The anti-slip teeth (21) are provided with 3-6 tooth points;
The tooth tips of the anti-slip teeth (21) are distributed on the same section of circular arc, and the arc length between the tooth tips of any two adjacent anti-slip teeth (21) is equal; the rotation angle of the tooth block (2) is 3-5 degrees;
The central angle corresponding to the circular arc where the tooth tip of the anti-slip tooth (21) is positioned is more than or equal to 45 degrees and less than or equal to 50 degrees;
the sealing ring body (1) is provided with a tapered section inner wall tapered towards one end where the sealing lip (11) is located, an included angle between the tapered section inner wall and the outer wall of the sealing ring body (1) is 20 degrees or more and beta is or less than 24 degrees, and the anti-slip teeth (21) are exposed from the tapered section inner wall.
2. The anti-slip seal ring for an STD type joint of a ductile iron pipe according to claim 1, wherein: the tooth blocks (2) are uniformly distributed around the axis of the sealing ring body (1).
3. The anti-slip seal ring for an STD type joint of a ductile iron pipe according to claim 1, wherein: the tooth block (2) is made of stainless steel, and the Rockwell hardness of the tooth block is 46-54.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910729488.4A CN110281449B (en) | 2019-08-08 | 2019-08-08 | Anti-slip sealing ring for STD type interface of ductile cast iron pipe and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910729488.4A CN110281449B (en) | 2019-08-08 | 2019-08-08 | Anti-slip sealing ring for STD type interface of ductile cast iron pipe and production method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110281449A CN110281449A (en) | 2019-09-27 |
| CN110281449B true CN110281449B (en) | 2024-07-05 |
Family
ID=68024992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910729488.4A Active CN110281449B (en) | 2019-08-08 | 2019-08-08 | Anti-slip sealing ring for STD type interface of ductile cast iron pipe and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110281449B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111940691B (en) * | 2020-08-07 | 2022-04-05 | 安钢集团永通球墨铸铁管有限责任公司 | Manufacturing process of double-bellmouth nodular cast iron pipe |
| CN112082016B (en) * | 2020-09-24 | 2022-12-02 | 马鞍山宏力橡胶制品有限公司 | Anti-slip anti-drop rubber sealing ring, manufacturing method thereof and pipeline interface sealing device |
| CN114542098A (en) * | 2021-08-11 | 2022-05-27 | 马鞍山宏力橡胶制品有限公司 | Application of T-shaped anti-stripping rubber ring in non-excavation horizontal directional dragging pipe engineering |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108373567A (en) * | 2018-04-02 | 2018-08-07 | 无锡市锡达电子科技有限公司 | A kind of anti-avulsion sealing ring and its manufacture craft |
| CN108799500A (en) * | 2018-07-10 | 2018-11-13 | 天津润木科技有限公司 | A kind of tunnel pipe for escaping connection sealing of the anti-disengagement of high sealing |
| CN209115854U (en) * | 2018-11-27 | 2019-07-16 | 马鞍山宏力橡胶制品有限公司 | A kind of A type flexible mechanical formula interface tube anti-avulsion sealing ring |
| CN210477560U (en) * | 2019-08-08 | 2020-05-08 | 马鞍山宏力橡胶制品有限公司 | Anti-release sealing ring for STD (super-cooled steel tube) type interface of nodular cast iron tube |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5464228A (en) * | 1992-11-04 | 1995-11-07 | United States Pipe And Foundry Company | Restraining element for pressure pipe joints |
| DE9311500U1 (en) * | 1993-08-02 | 1993-09-16 | Eisenwerke Fried. Wilh. Düker GmbH & Co, 97753 Karlstadt | Thrust-protected push-in joint |
| JP5396093B2 (en) * | 2009-01-30 | 2014-01-22 | 株式会社水道技術開発機構 | Fittings and packing rings |
| CN104110498A (en) * | 2014-07-10 | 2014-10-22 | 安徽京鸿密封件技术有限公司 | Y-type seal ring |
| CN207005513U (en) * | 2017-02-20 | 2018-02-13 | 魏嘉成 | Anti-avulsion metal-toothed and anti-avulsion rubber seal |
| CN108488380A (en) * | 2018-04-27 | 2018-09-04 | 北京洛科瀚科技有限公司 | A kind of corrugated rubber seal of double hardness |
| CN208830640U (en) * | 2018-09-14 | 2019-05-07 | 陈昌兄弟石材(上海)有限公司 | Granite decorative panel |
-
2019
- 2019-08-08 CN CN201910729488.4A patent/CN110281449B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108373567A (en) * | 2018-04-02 | 2018-08-07 | 无锡市锡达电子科技有限公司 | A kind of anti-avulsion sealing ring and its manufacture craft |
| CN108799500A (en) * | 2018-07-10 | 2018-11-13 | 天津润木科技有限公司 | A kind of tunnel pipe for escaping connection sealing of the anti-disengagement of high sealing |
| CN209115854U (en) * | 2018-11-27 | 2019-07-16 | 马鞍山宏力橡胶制品有限公司 | A kind of A type flexible mechanical formula interface tube anti-avulsion sealing ring |
| CN210477560U (en) * | 2019-08-08 | 2020-05-08 | 马鞍山宏力橡胶制品有限公司 | Anti-release sealing ring for STD (super-cooled steel tube) type interface of nodular cast iron tube |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110281449A (en) | 2019-09-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110281449B (en) | Anti-slip sealing ring for STD type interface of ductile cast iron pipe and production method thereof | |
| CN109280271B (en) | Heat-insulating wear-resistant polypropylene composite material pipeline for oil pipe lining and manufacturing method thereof | |
| CN104358965B (en) | A kind of steel skeleton plastic clad pipe couples sealing surface structure and anti-leaking method thereof | |
| CN112082016B (en) | Anti-slip anti-drop rubber sealing ring, manufacturing method thereof and pipeline interface sealing device | |
| CN103527886A (en) | Enhanced blind joint and metal lining ring of flaring | |
| CN210477560U (en) | Anti-release sealing ring for STD (super-cooled steel tube) type interface of nodular cast iron tube | |
| CN103925426B (en) | Prestressed concrete pipe | |
| KR101150166B1 (en) | Drinking water pipe and connector applied nitro-oxidation process and derail controlling clamping method | |
| CN210069154U (en) | Double-layer injection molding wear-resistant pipe fitting | |
| CN105949540A (en) | Hose lining material for ultrahigh-pressure wire-wound hydraulic hose and preparation method of hose lining material | |
| CN216590461U (en) | Quick connector, assembly and special wrench connected with steel wire framework hose | |
| CN207394228U (en) | The aperture blocking clamper that a kind of soft metal is filled up | |
| CN205559767U (en) | Fast open -blind board of retaining ring formula | |
| CN212249951U (en) | Large-drift-diameter high-pressure wellhead valve | |
| CN210564384U (en) | Improved fully-coated sucker rod base body, clamp and sucker rod | |
| CN221857515U (en) | Rubber sealing ring embedded with metal teeth | |
| CN221743389U (en) | Corrosion-resistant steel pipe for repairing pipeline lining | |
| CN218914019U (en) | Steel lining rubber composite pipe | |
| CN115111444A (en) | Plastic-lined pipeline branch pipe connecting structure | |
| CN106385827A (en) | Underground pipe connection tool for saline-alkali land | |
| CN206054961U (en) | Penstock reinforcing bar composite concrete pipe and the pipeline being made from it | |
| CN206845991U (en) | A kind of aerial drainage overflow integral valve | |
| CN204459495U (en) | The heat-resisting liner composite plastic pipe of a kind of deep-well oil-extraction | |
| CN218883171U (en) | Relay room for jacking pipe | |
| CN203258274U (en) | Seamless connector with rubber lining layers |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |