CN111576491A - Nodular cast iron double-layer safety protection type well lid and production method thereof - Google Patents
Nodular cast iron double-layer safety protection type well lid and production method thereof Download PDFInfo
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- CN111576491A CN111576491A CN202010455159.8A CN202010455159A CN111576491A CN 111576491 A CN111576491 A CN 111576491A CN 202010455159 A CN202010455159 A CN 202010455159A CN 111576491 A CN111576491 A CN 111576491A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
- E02D29/14—Covers for manholes or the like; Frames for covers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
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- 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
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
- E02D29/127—Manhole shafts; Other inspection or access chambers; Accessories therefor with devices for impeding fall or injuries of persons
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
- E02D29/14—Covers for manholes or the like; Frames for covers
- E02D29/1481—Security devices, e.g. indicating unauthorised opening
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
- E03F5/06—Gully gratings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/10—Building elements, e.g. bricks, blocks, tiles, panels, posts, beams
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
- E02D2300/0031—Steel; Iron in cast iron form
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
- E03F5/06—Gully gratings
- E03F2005/066—Gully gratings with means for protecting against vandalism
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Health & Medical Sciences (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention discloses a nodular cast iron double-layer safety protection type well lid and a production method thereof, belonging to the technical field of well lids, and comprising an upper cover and a lower cover, wherein the lower end of the upper cover is connected with the lower cover; the upper cover comprises an upper cover body, anti-slip teeth, water discharging holes and air holes, the upper surface of the upper cover body is provided with the anti-slip teeth which are criss-cross, the middle part of the upper cover body is provided with a plurality of water discharging holes which are distributed in an annular shape, and the edge of the upper cover body is provided with the air holes; the air holes can be provided with locks; the lower cover comprises an air bag, a circular hub, a circular core and a screw rod, the air bag is arranged outside the circular hub, the circular core is arranged in the middle of the circular hub, the circular core is fixedly connected with the upper cover, and the screw rod is connected between the circular core and the circular hub. Can effectively prevent stealing, prevent pedestrian's sewer that drops, the security is high.
Description
Technical Field
The invention relates to the technical field of well lids, in particular to a nodular cast iron double-layer safety protection type well lid and a production method thereof.
Background
The well lid is used for covering road or deep well at home, prevents that people or object from falling. The manhole cover can be divided into a metal manhole cover, a high-strength fiber cement concrete manhole cover, a resin manhole cover and the like according to the material, and at present, most of sewers in cities use nodular cast iron manhole covers. The cast iron can be recycled, so the well cover becomes a theft target of a thief. The sewer of stolen nodular cast iron well lid very easily makes the pedestrian fall into it and the injury, and it all can lead to the sewer mouth to expose to well lid damage, well lid maintenance in-process, causes the potential safety hazard, and current theftproof well lid theftproof performance is poor, can not effectively improve the safety protection performance of well lid.
Disclosure of Invention
The invention aims to provide a nodular cast iron double-layer safety protection type well lid and a production method thereof, which can effectively prevent theft and pedestrians from falling off a sewer, have high safety and solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a nodular cast iron double-layer safety protection type well lid comprises an upper cover and a lower cover, wherein the lower end of the upper cover is connected with the lower cover; the upper cover comprises an upper cover body, anti-slip teeth, water discharging holes and air holes, the upper surface of the upper cover body is provided with the anti-slip teeth which are criss-cross, the middle part of the upper cover body is provided with a plurality of water discharging holes which are distributed in an annular shape, and the edge of the upper cover body is provided with the air holes; the air hole can be provided with a lock.
Further, the lower cover comprises an air bag, a circular hub, a circular core and a screw rod, the air bag is arranged outside the circular hub, the circular core is arranged in the middle of the circular hub, the circular core is fixedly connected with the upper cover, and the screw rod is connected between the circular core and the circular hub.
Further, a plurality of screw holes distributed in an annular shape are formed in the edges of the upper cover body and the annular hub, and the upper cover and the lower cover are fixedly connected through bolts.
Furthermore, the lower surface edge of the upper cover body is welded with a welding column, and the lower end face of the welding column is welded with a ring hub.
Furthermore, the screw rods are divided into an upper layer and a lower layer, 16-38 screw rods are arranged on each layer and distributed in an annular array, and the connecting ends of the screw rods and the round cores are inclined outwards.
Furthermore, the screw rods are divided into an upper layer and a lower layer, each layer is provided with 8-14 groups, each group is divided into two groups, the two screw rods are mutually staggered, the multiple groups of screw rods are distributed in an annular array, and the connecting ends of the screw rods and the round cores are inclined outwards.
Further, the gasbag includes crust, air cavity, air flue and air cock, and the inside of crust is the air cavity, and the edge of crust opens and is connected with the air flue, and the air cock is installed to the upper end of air flue, and the air cock is arranged in the air flue, and the air cock communicates with each other through air flue and air cavity. The outer skin is made of automobile tire rubber, and has high wear resistance and large surface friction.
According to another aspect of the invention, a method for producing a nodular cast iron double-layer safety protection type well lid is provided, which comprises the following steps:
s1: manufacturing an upper cover by adopting a lost foam casting method;
s2: manufacturing a lower cover;
s3: and assembling the upper cover and the lower cover, after welding the welding column on the ring hub, overlapping the upper cover and the lower cover, extending the air nozzle into the air hole, and welding the upper end of the welding column with the lower surface of the upper cover.
Further, S2 includes the following steps:
s201: manufacturing a sheath, heating a rubber raw material to be molten, injecting the rubber raw material into a mold, and demolding after hot press molding to obtain the sheath;
s202: respectively manufacturing a ring hub and a round core by adopting a lost foam casting method;
s203: the outer skin is bonded on the outer side of the annular hub, an air passage and an air tap are installed on the edge of the outer skin in an opening mode, and a screw rod is installed between the annular hub and the round core.
Further, in the step S3, screw holes are formed in the edges of the ring hub and the upper cover, the upper cover and the lower cover are placed in an overlapped mode, the air nozzles extend into the air holes, and the upper cover and the lower cover are locked through the bolt connecting screw holes.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a nodular cast iron double-layer safety protection type well lid and a production method thereof, wherein the well lid with an uninflated air bag is arranged on a road, the air bag is inflated through an air nozzle extending into an air hole after installation, the air bag expands after inflation to extrude the side wall of a sewer, the well lid cannot be detached under the inflated state of the air bag, the well lid is prevented from being stolen, the sewer is further prevented from being exposed, then the upper cover and the lower cover are connected through bolts, the upper cover can be detached through the detaching bolts, the lower cover can perform secondary protection under the condition of repairing and detaching the well lid or under the state of damaging the upper cover, the sewer is prevented from falling, and therefore, the well lid can be effectively prevented from being stolen, the sewer is prevented from falling, and the safety.
Drawings
Fig. 1 is an overall structural view of a nodular cast iron double-layer safety protection type well lid in the first embodiment of the invention;
fig. 2 is a side view of a nodular cast iron double-layer safety protection type well lid in the first embodiment of the invention;
FIG. 3 is a partial cross-sectional view of the invention of FIG. 2;
FIG. 4 is a lower cover structure diagram of the nodular cast iron double-layer safety protection type well cover of the invention;
FIG. 5 is another structural diagram of the lower cover of the nodular cast iron double-layer safety protection type well cover of the invention;
fig. 6 is an overall structural view of a nodular cast iron double-layer safety protection type well lid in the second embodiment of the invention;
FIG. 7 is a flow chart of the production method of the nodular cast iron double-layer safety protection type well lid of the invention;
fig. 8 is a flow chart of S2 of the method for producing the spheroidal graphite cast iron double-layer safety protection type well lid of the invention.
In the figure: 1. an upper cover; 11. an upper cover body; 111. a screw hole; 112. welding the column; 12. anti-slip teeth; 13. a drain hole; 14. air holes; 2. a lower cover; 21. an air bag; 211. a skin; 212. an air cavity; 213. an airway; 214. an air tap; 22. a ring hub; 23. a round core; 24. and a screw rod.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
referring to fig. 1-5, the nodular cast iron double-layer safety protection type well lid comprises an upper lid 1 and a lower lid 2, wherein the lower end of the upper lid 1 is connected with the lower lid 2; the upper cover 1 comprises an upper cover body 11, anti-skid teeth 12, water discharge holes 13 and air holes 14, the upper surface of the upper cover body 11 is provided with the anti-skid teeth 12 which are criss-cross, the middle part of the upper cover body 11 is provided with a plurality of water discharge holes 13 which are distributed in a ring shape, and the edge of the upper cover body 11 is provided with the air holes 14; a lock can be arranged on the air hole 14, and only a person with a key can unlock the lock, the plug of the air pump is inserted into the air nozzle 214, and the air in the air cavity 212 is pumped out by the air pump; go up the lower surface edge welding of lid 11 and have weld column 112, weld column 112's lower terminal surface welding has ring hub 22, install the well lid under the gasbag 21 not inflation state on the road, aerify in gasbag 21 through extending to air cock 214 in the gas pocket 14 after the installation, aerify back gasbag 21 inflation, extrude the sewer lateral wall, can't dismantle the well lid under gasbag 21 inflation state, avoid the well lid to be stolen, and then avoid the sewer to expose, dismantle upper cover 1 and only can bleed air to gasbag 21 earlier, dismantle upper cover 1 again.
The lower cover 2 comprises an air bag 21, a circular hub 22, a circular core 23 and a screw rod 24, the air bag 21 is arranged outside the circular hub 22, the circular core 23 is arranged in the middle of the circular hub 22, the circular core 23 is fixedly connected with the upper cover 1, the screw rod 24 is connected between the circular core 23 and the circular hub 22, the circular core 23 is fixedly connected with the upper cover 1 through welding or bolts, the screw rod 24 is divided into an upper layer and a lower layer, each layer is provided with 38 pieces, the upper cover and the lower cover are distributed in an annular array mode, the connecting end of the screw rod 24 and the circular core 23 inclines outwards or the connecting end of the screw rod 24 is divided into an upper layer and a lower layer, each layer is provided with 8 groups, each group is divided into two groups, the two screw rods 24 are staggered mutually, the multiple groups of screw rods 24 are distributed in an annular array mode.
The air bag 21 comprises a skin 211, an air cavity 212, an air passage 213 and an air nozzle 214, wherein the air cavity 212 is arranged inside the skin 211, the air passage 213 is connected to the edge of the skin 211, the air nozzle 214 is arranged at the upper end of the air passage 213, the air nozzle 214 is positioned in the air hole 14, and the air nozzle 214 is communicated with the air cavity 212 through the air passage 213. The outer skin 211 is made of automobile tire rubber, and has high wear resistance and large surface friction.
Referring to fig. 7-8, in order to better show the production process of the nodular cast iron double-layer safety protection type manhole cover, the embodiment now proposes a production method of the nodular cast iron double-layer safety protection type manhole cover, which includes the following steps:
s1: manufacturing an upper cover 1, and manufacturing the upper cover 1 by adopting a lost foam casting method; manufacturing a corresponding lost foam of the upper cover 1, injecting a nodular cast iron raw material into the lost foam in a negative pressure state, demolding after molding to obtain an upper cover body 11, and forming air holes 14 in the edge of the upper cover body 11 to obtain the upper cover 1;
s2: manufacturing a lower cover 2; the method comprises the following specific steps:
s201: manufacturing a sheath 211, heating a rubber raw material to be molten, injecting the rubber raw material into a mold, and demolding after hot-press molding to obtain the sheath 211;
s202: respectively manufacturing a ring hub 22 and a round core 23 by adopting a lost foam casting method; manufacturing lost foam corresponding to the ring hub 22 and the round core 23, injecting a nodular cast iron raw material into the lost foam in a negative pressure state, and demolding after molding to obtain the ring hub 22 and the round core 23;
s203: the outer skin 211 is adhered to the outer side of the annular hub 22, an air channel 213 and an air nozzle 214 are arranged on the edge of the outer skin 211, and a screw rod 24 is arranged between the annular hub 22 and the round core 23; the two ends of the screw rod 24 are connected with the annular hub 22 and the round core 23 through welding, bolts or hinges;
s3: assembling the upper cover 1 and the lower cover 2, after welding the welding columns 112 on the ring hub 22, overlapping the upper cover 1 and the lower cover 2, extending the air nozzles 214 into the air holes 14, and welding the upper ends of the welding columns 112 with the lower surface of the upper cover 1.
Example two
Referring to fig. 6, the nodular cast iron double-layer safety protection type well lid comprises an upper lid 1 and a lower lid 2, wherein the lower end of the upper lid 1 is connected with the lower lid 2; the upper cover 1 comprises an upper cover body 11, anti-skid teeth 12, water discharge holes 13 and air holes 14, the upper surface of the upper cover body 11 is provided with the anti-skid teeth 12 which are criss-cross, the middle part of the upper cover body 11 is provided with a plurality of water discharge holes 13 which are distributed in a ring shape, and the edge of the upper cover body 11 is provided with the air holes 14; a lock can be arranged on the air hole 14, and only a person with a key can unlock the lock, the plug of the air pump is inserted into the air nozzle 214, and the air in the air cavity 212 is pumped out by the air pump; the edge of the upper cover body 11 and the edge of the ring hub 22 are both provided with a plurality of screw holes 111 which are distributed annularly, the upper cover 1 and the lower cover 2 are fixedly connected through bolts, the upper cover 1 and the lower cover 2 are connected through the bolts, the upper cover 1 can be detached through the detaching bolts, and under the condition of maintaining and detaching the well cover or the state of damaging the upper cover 1, the lower cover 2 can perform secondary protection to prevent pedestrians from falling off the sewer, so the well cover can effectively prevent theft, prevent pedestrians from falling off the sewer and has high safety;
the lower cover 2 comprises an air bag 21, a circular hub 22, a circular core 23 and a screw rod 24, the air bag 21 is arranged outside the circular hub 22, the circular core 23 is arranged in the middle of the circular hub 22, the circular core 23 is fixedly connected with the upper cover 1, the screw rod 24 is connected between the circular core 23 and the circular hub 22, the circular core 23 is fixedly connected with the upper cover 1 through welding or bolts, the screw rod 24 has an upper layer and a lower layer, each layer is provided with 38 screw rods which are distributed in an annular array, the connecting end of the screw rod 24 and the circular core 23 inclines outwards or the connecting end of the screw rod 24 has an upper layer and a lower layer, each layer is provided with 8 groups, each group has two screw rods, the two screw rods 24 are staggered with each other, the multiple groups of screw rods 24 are distributed in an annular array, the connecting ends of the screw rods 24 and the;
the air bag 21 comprises a skin 211, an air cavity 212, an air passage 213 and an air nozzle 214, wherein the air cavity 212 is arranged inside the skin 211, the air passage 213 is connected to the edge of the skin 211, the air nozzle 214 is arranged at the upper end of the air passage 213, the air nozzle 214 is positioned in the air hole 14, and the air nozzle 214 is communicated with the air cavity 212 through the air passage 213. The outer skin 211 is made of automobile tire rubber, and has high wear resistance and large surface friction.
Referring to fig. 7-8, in order to better show the production process of the nodular cast iron double-layer safety protection type manhole cover, the embodiment now proposes a production method of the nodular cast iron double-layer safety protection type manhole cover, which includes the following steps:
s1: manufacturing an upper cover 1, and manufacturing the upper cover 1 by adopting a lost foam casting method; manufacturing a corresponding lost foam of the upper cover 1, injecting a nodular cast iron raw material into the lost foam in a negative pressure state, demolding after molding to obtain an upper cover body 11, and forming air holes 14 in the edge of the upper cover body 11 to obtain the upper cover 1;
s2: manufacturing a lower cover 2; the method comprises the following specific steps:
s201: manufacturing a sheath 211, heating a rubber raw material to be molten, injecting the rubber raw material into a mold, and demolding after hot-press molding to obtain the sheath 211;
s202: respectively manufacturing a ring hub 22 and a round core 23 by adopting a lost foam casting method; manufacturing lost foam corresponding to the ring hub 22 and the round core 23, injecting a nodular cast iron raw material into the lost foam in a negative pressure state, and demolding after molding to obtain the ring hub 22 and the round core 23;
s203: the outer skin 211 is adhered to the outer side of the annular hub 22, an air channel 213 and an air nozzle 214 are arranged on the edge of the outer skin 211, and a screw rod 24 is arranged between the annular hub 22 and the round core 23; the two ends of the screw rod 24 are connected with the annular hub 22 and the round core 23 through welding, bolts or hinges;
s3: assembling the upper cover 1 and the lower cover 2, forming screw holes 111 on the ring hub 22 and the edge of the upper cover 1, placing the upper cover 1 and the lower cover 2 in an overlapping manner, extending the air nozzles 214 into the air holes 14, and fastening the upper cover 1 and the lower cover 2 through the bolt connecting screw holes 111.
In summary, the following steps: the invention provides a nodular cast iron double-layer safety protection type well lid and a production method thereof, the well lid is installed on a road under the state that an air bag 21 is not inflated, the air bag 21 is inflated through an air nozzle 214 extending into an air hole 14 after installation, the air bag 21 expands after inflation, the side wall of a sewer is extruded, the well lid cannot be detached under the state that the air bag 21 is inflated, the well lid is prevented from being stolen, the sewer is further prevented from being exposed, then the upper cover 1 and the lower cover 2 are connected through a bolt, the upper cover 1 can be detached through a detaching bolt, under the condition that the well lid is repaired and detached or the upper cover 1 is damaged, the lower cover 2 can perform secondary protection, pedestrians are prevented from falling off the sewer, therefore, the well lid can be effectively prevented from being stolen, the sewer is prevented from.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions disclosed in the present invention and the equivalent alternatives or modifications thereof within the scope of the present invention.
Claims (10)
1. The nodular cast iron double-layer safety protection type well lid is characterized by comprising an upper lid (1) and a lower lid (2), wherein the lower end of the upper lid (1) is connected with the lower lid (2); the upper cover (1) comprises an upper cover body (11), anti-skidding teeth (12), drainage holes (13) and air holes (14), wherein the anti-skidding teeth (12) which are criss-cross are formed in the upper surface of the upper cover body (11), the plurality of drainage holes (13) which are distributed in an annular mode are formed in the middle of the upper cover body (11), and the air holes (14) are formed in the edge of the upper cover body (11); the air hole (14) can be provided with a lock.
2. The nodular cast iron double-layer safety protection type well lid as claimed in claim 1, wherein said lower lid (2) comprises an air bag (21), a ring hub (22), a round core (23) and a screw rod (24), the air bag (21) is arranged outside the ring hub (22), the round core (23) is arranged in the middle of the ring hub (22), the round core (23) is fixedly connected with the upper lid (1), and the screw rod (24) is connected between the round core (23) and the ring hub (22).
3. The nodular cast iron double-layer safety protection type well lid of claim 2, wherein the upper lid (11) and the ring hub (22) are both provided with a plurality of screw holes (111) distributed annularly, and the upper lid (1) and the lower lid (2) are fixedly connected through bolts.
4. The nodular cast iron double-layer safety protection type well lid as claimed in claim 3, wherein the lower surface edge of said upper lid body (11) is welded with a welding column (112), and the lower end surface of the welding column (112) is welded with a ring hub (22).
5. The nodular cast iron double-layer safety protection type manhole cover according to claim 2, wherein the lead screw (24) has an upper layer and a lower layer, each layer has 16-38, and is distributed in an annular array, and the connecting end of the lead screw (24) and the round core (23) is inclined outwards.
6. The nodular cast iron double-layer safety protection type well lid as claimed in claim 2, wherein said lead screws (24) have two layers, each layer has 8-14 groups, each group has two, and two lead screws (24) are staggered, the groups of lead screws (24) are distributed in a circular array, and the connection ends of the lead screws (24) and the round core (23) are inclined outwards.
7. The dual-layer safety protection type well lid of nodular cast iron as claimed in claim 2, wherein said air bag (21) comprises a skin (211), an air cavity (212), an air passage (213) and an air tap (214), the air cavity (212) is inside the skin (211), the air passage (213) is connected to the edge of the skin (211), the air tap (214) is installed on the upper end of the air passage (213), the air tap (214) is located in the air hole (14), and the air tap (214) is communicated with the air cavity (212) through the air passage (213).
8. The production method of the spheroidal graphite cast iron double-layer safety protection type well lid according to any one of claims 1 to 7, characterized by comprising the following steps:
s1: manufacturing an upper cover (1), and manufacturing the upper cover (1) by adopting a lost foam casting method;
s2: manufacturing a lower cover (2);
s3: the upper cover (1) and the lower cover (2) are assembled, after the welding column (112) is welded on the ring hub (22), the upper cover (1) and the lower cover (2) are placed in an overlapping mode, the air nozzle (214) extends into the air hole (14), and the upper end of the welding column (112) is welded with the lower surface of the upper cover (1).
9. The method for manufacturing the nodular cast iron double-layer safety protection type manhole cover according to claim 8, wherein S2 comprises the following steps:
s201: manufacturing a sheath (211), heating a rubber raw material to be molten, injecting the rubber raw material into a mold, performing hot-press molding, and demolding to obtain the sheath (211);
s202: respectively manufacturing a ring hub (22) and a round core (23) by adopting a lost foam casting method;
s203: the outer skin (211) is bonded on the outer side of the annular hub (22), an air channel (213) and an air nozzle (214) are arranged on the edge of the outer skin (211) in a hole forming mode, and a screw rod (24) is arranged between the annular hub (22) and the round core (23).
10. The method for manufacturing the manhole cover with double safety protection of nodular cast iron as claimed in claim 8, wherein in S3, screw holes (111) are opened on the edge of the ring hub (22) and the upper cover (1), the upper cover (1) and the lower cover (2) are overlapped, the air nozzles (214) extend into the air holes (14), and the screw holes (111) are connected by bolts to lock the upper cover (1) and the lower cover.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010455159.8A CN111576491A (en) | 2020-05-26 | 2020-05-26 | Nodular cast iron double-layer safety protection type well lid and production method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010455159.8A CN111576491A (en) | 2020-05-26 | 2020-05-26 | Nodular cast iron double-layer safety protection type well lid and production method thereof |
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| CN204000947U (en) * | 2014-07-28 | 2014-12-10 | 国家电网公司 | A kind of buffering type double-layered well lid |
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Application publication date: 20200825 |