CN112008853A

CN112008853A - Inflatable rubber tyre, skeleton and plug device for coating cast pipe

Info

Publication number: CN112008853A
Application number: CN201910454941.5A
Authority: CN
Inventors: 井朝纲; 井长虹
Original assignee: Hengshui Weida Rubber & Plastic Co ltd
Current assignee: Hengshui Weida Rubber & Plastic Co ltd
Priority date: 2019-05-29
Filing date: 2019-05-29
Publication date: 2020-12-01

Abstract

An inflatable pneumatic tire, carcass and plug assembly for cast pipe lining is provided. An inflatable pneumatic tire comprising: the pneumatic tire comprises a rubber tire body, an inflating nozzle, a traction ring belt and at least one vent hole. The framework comprises an L-shaped part, a T-shaped part and a mudguard. The plug device comprises an inflatable rubber tire and a framework. When the framework is matched with the inflatable rubber tire to be used for coating the lining of the cast pipe, the coating on the inner wall of the end face of the cast pipe can be prevented from being stuck off, and the angle of the end face of the coating layer is smaller.

Description

Inflatable rubber tyre, skeleton and plug device for coating cast pipe

Technical Field

The present application relates to an inflatable pneumatic tire for cast pipe lining, particularly for cast pipe lining with a low end face angle of the lining layer, a carcass for an inflatable pneumatic tire and a plug assembly comprising a carcass and an inflatable pneumatic tire.

Background

In the process of producing cast pipes, it is often necessary to form a lining layer on the inner wall of the cast pipe in order to prolong the service life of the cast pipe and to achieve cleanliness of the conveying medium. It is a common practice to apply a cement coating with a thickness of more than 2 mm. Typically, the ends of the cast tube are sealed using a plug device; then, cement is injected into the cast pipe, and through the high-speed rotation of the cast pipe, the cement slurry gradually forms a cement coating with uniform thickness and certain hardness and adhesive force on the inner wall of the cast pipe by utilizing the centrifugal action, and water is possibly precipitated in the process; and finally, disassembling and taking down the plug device, and discharging the separated water.

However, it has long been the case that the plug often sticks off the cement coating the end face of the cast tube during the above-described removal of the plug device. Therefore, it is often necessary for field personnel to manually rework the cementitious coating to ensure the integrity of the cement lining applied to the inner wall of the cast pipe. Therefore, the working time of coating operation is prolonged, the efficiency is low, the field environment is polluted by working media such as cement and the like due to manual repair, and the difficulty of subsequent cleaning work is increased. In addition, the adhesion of the cement coating to the inner wall of the cast pipe produced by such post-repair is also affected. In some cases, it is also possible that the end face angle at which the coating layer is desired is small.

Therefore, it is highly desirable to provide a rubber tire, a frame and a plug device to prevent or at least reduce the cement from being stuck on the end face of the cast pipe, reduce the labor load, maintain the cleanliness of the environment of the operation site, and meet the requirement of smaller end face angle of the lining layer.

Disclosure of Invention

The present application aims to provide an inflatable pneumatic tyre for cast pipe lining, a carcass suitable for an inflatable pneumatic tyre and a stopper device comprising a carcass and an inflatable pneumatic tyre, which are advantageous over the prior art in at least one aspect.

To this end, the present application provides, in one aspect, an inflatable pneumatic tyre for cast pipe lining, adapted to cooperate with a carcass to form a stopper device, said inflatable pneumatic tyre comprising:

a carcass having a substantially L-shaped cross-section and being internally hollow, said carcass comprising a molding wall, an expansion wall and a contact wall connected to each other, wherein the molding wall is adapted for casting a tube, the expansion wall is adapted to be expandable within a carcass, the contact wall is adapted to contact the carcass, and wherein the expansion wall comprises a first portion, a second portion, a third portion, a fourth portion and a fifth portion connected in series, the second portion and the third portion being connected at a corner, and a fixing ring connected to the connection of the contact wall and the expansion wall;

an inflation nozzle connected to the tire body for inflating an inflation medium into the inflatable tire to inflate the inflatable tire;

the traction ring belt is positioned on the inner wall surface of the rubber tire body and respectively limits a first chamber and a second chamber, the first chamber extends along the axial direction, the second chamber is in a V shape, and the traction ring belt is used for limiting the axial expansion of the forming wall so as to keep the angle of the forming wall and prevent the plug device from falling off; and

at least one vent distributed on the pulling loop strap and configured to communicate the first chamber and the second chamber;

and wherein the angle between the outer surface of the third portion of the expansion wall and the outer surface of the fourth portion of the expansion wall is less than 90 degrees when not inflated and gradually increases as the second chamber expands when inflated.

Optionally, the carcass further comprises at least one anti-slip ring arranged on the forming wall to ensure the fastening of the plug device on the casting tube;

optionally, the rubber tire further comprises at least one anti-slip rib.

Optionally, an angle between an outer surface of the first portion of the expansion wall and an outer surface of the second portion of the expansion wall is greater than 90 degrees.

Optionally, the outer surface of the second portion of the expansion wall extends substantially in an axial direction, and wherein, in an uninflated state, an angle between the outer surface of the second portion of the expansion wall and the outer surface of the third portion of the expansion wall is less than 90 degrees, and the angle gradually increases as the inflation expands.

The present application provides, in another aspect, a carcass for a cast tube lining, suitable for cooperating with an inflatable pneumatic tyre to form a bulkhead device, said carcass comprising a housing portion defining a housing space, said housing space comprising a fixing groove,

and wherein the accommodating portion comprises: an L-shaped member and a T-shaped member connected to each other at one end, wherein the L-shaped member extends beyond the T-shaped member in an axial direction, and wherein the T-shaped member includes a first section connected to each other extending substantially in a radial direction and a second section extending substantially in the axial direction, and a projection on the second section and extending radially outward, the projection defining an axially inner side surface of the fixation groove;

and wherein the first section of the T-shaped member includes a first generally axially extending surface and a second generally radially extending surface, a radially outer end of which is connected to an axially outer end of the first surface, the second section of the T-shaped member includes a first generally axially extending surface, an axially inner end of which is connected to a radially inner end of the second surface of the first section,

and wherein, be provided with the through-hole that can communicate with external atmosphere on the L type part of skeleton, be provided with at least one breathing hole that can communicate with external atmosphere on the T type part of skeleton.

Optionally, the skeleton further includes: a fender attached to the accommodating portion and configured to be closed or to have an opening for feeding a distributing pipe for injecting cement into the casting pipe.

The present application provides in yet another aspect a plug device for cast pipe lining comprising an inflatable pneumatic tire as described above and a carcass as described above, wherein the receiving space of the carcass is adapted to receive the body of the inflatable pneumatic tire, the through-going hole of the carcass is configured to accommodate an inflation nozzle of the inflatable pneumatic tire therethrough, the securing slot is configured to accommodate the securing ring, the inflatable pneumatic tire has a first non-inflated state and a second inflated state, and wherein,

before inflation, the inflatable rubber tyre is in a first state, the rubber tyre body is matched into the L-shaped part of the framework and defines an expansion cavity with the T-shaped part of the framework, the expansion cavity defines a standard telescopic path of the inflatable rubber tyre,

upon inflation, the carcass expands, the first, second and third portions of the expansion wall expand and deform in a second generally axial direction, the fourth and fifth portions of the expansion wall expand and deform in a normalized manner in a first direction having axially and radially inward directions in said defined telescoping path until closely fitting against the inner surface of the T-shaped member such that the expansion cavity disappears, the inflatable carcass is in a second state, and

after deflation, the inflatable tire returns to the first state, the tire body retracts, the fourth part and the fifth part of the expansion wall are separated from the T-shaped part of the framework, and the expansion type is formed again.

Optionally, in the second state, a third portion of the expansion wall is in close proximity to the first surface of the first section of the T-shaped component, a fourth portion of the expansion wall is in close proximity to the second surface of the first section of the T-shaped component, and a fifth portion of the expansion wall is in close proximity to the first surface of the second section of the armature.

Optionally, the securing ring is further configured to: in the case of use of the inflatable pneumatic tire in cooperation with the carcass, the securing ring is secured in the securing groove whether in the first state or the second state.

Optionally, in an uninflated state, the corner portion pushes against the first surface of the first section of the T-shaped member, and during inflation the corner portion is guided to slide along the first surface of the first section of the T-shaped member, forcing the expansion wall to deform.

Therefore, the application provides a plug device, so that an expansion cavity is formed between an inflatable rubber tire and a framework, the molding wall of the inflatable rubber tire still stretches in a standard path under the action of air pressure, the cement coating on the inner wall of a cast pipe is prevented from being stuck by the plug device, and the plug device has the advantages of reducing labor cost, being high in efficiency, preventing the field operation environment from deteriorating and the like; in addition, the requirement that the end face angle of the coating layer is small can be met, and when the plug device is disassembled when the inflatable rubber tire is deflated, the inflatable rubber tire can be accurately reset in the rigid framework, so that the expansion cavity is formed again.

Drawings

FIG. 1 illustrates a partial cross-sectional view of a deadhead apparatus according to an embodiment of the present application, wherein an inflatable pneumatic tire is in a first state;

FIG. 2 illustrates a partial cross-sectional view of the deadhead apparatus according to an embodiment of the present application, with the inflatable pneumatic tire in a second state;

FIG. 3 illustrates a partial cross-sectional view of one embodiment of a scaffold according to the present application;

FIG. 4 illustrates a partial cross-sectional view of one embodiment of an inflatable pneumatic tire according to the present application; and

fig. 5A-B show a further embodiment of an inflatable pneumatic tire according to the present application, wherein the inflatable tire has an anti-slip ring.

Detailed Description

Some possible embodiments of the present application are described below with reference to the drawings. It should be noted that the figures are not drawn to scale. Some details may be exaggerated for clarity and some details not necessarily shown may be omitted.

It should be noted that in the present application, the terms "axial" and "radial" are defined relative to the direction of the casting tube, and are oriented along the central axis of the casting tube. The use of "axial" and "radial" are descriptive (only indicating relative orientations of the components) and not limiting in any way (i.e., not specifically referring to a particular orientation). The terms "axially inward" and "axially inward" refer to a direction toward the casting tube. The terms "radially inward" and "radially inward" refer to a direction toward the axis of the cast tube.

As shown in fig. 1, the present application discloses an inflatable pneumatic tyre 2 suitable for carcass, a carcass 3 suitable for inflatable pneumatic tyre 2 and a stopper device 1 comprising said carcass 3 and inflatable pneumatic tyre 2.

As shown in fig. 1 and 4, an inflatable pneumatic tire 2 as disclosed herein is shown. The inflatable pneumatic tire 2 includes a tire body 20. The tire body 20 may be made of any suitable material having a telescoping capability, including but not limited to rubber. The interior of the carcass 20 is hollow to contain an inflation medium, including but not limited to air. The inflatable pneumatic tyre 2 comprises a pulling loop strip 21 inside the tyre body 20. The material of the pull ring belt 21 may be rubber or any other suitable material. The traction belt 21 divides the interior of the carcass 20 into a first chamber 22 and a second chamber 23, wherein the first chamber 22 extends substantially axially and the second chamber 23 has a substantially V-shaped cross-section, extending substantially radially and axially respectively. At least one vent hole 24 is distributed on the traction ring belt 21. The at least one vent 24 communicates between the first chamber 22 and the second chamber 23. The size and/or shape of the at least one vent hole 24 may be any suitable size and shape. In the case where two or more vent holes 24 are provided, the size and/or shape of each vent hole 24 may be the same or different. The carcass 20 comprises a molding wall 201, an expansion wall 202 and a contact wall 203 connected to each other. The forming wall 201 is adapted for use with the casting tube 5. The expansion wall 202 is adapted to be capable of expanding within the scaffold 3. The contact wall 203 is adapted to contact the skeleton 3. The profiled wall 201 is adapted as a socket 51 for the casting tube 5. An inflation nozzle 26 may be mounted on the contact wall 203 of the inflatable pneumatic tyre 2. One end of the inner side of the charging nozzle 26 may be located on the inner surface of the first chamber 22 (shown in fig. 1) or the second chamber 23 (not shown). Accordingly, the inflation medium can be filled into the first chamber 22 or the second chamber 23 of the inflatable pneumatic tire 2 via the inflation nozzle 26 and inflated. Since the vent hole 24 communicates the first chamber 22 and the second chamber 23, accordingly, the second chamber 23 or the first chamber 22 also expands. During inflation, the pulling belts 21 are tightened to keep the angle and shape of the molding wall 201 of the inflatable tyre 2 substantially constant.

The tire 2 disclosed herein may further include a securing ring 206. A retaining ring 206 is connected to the junction of the contact wall 203 and the expansion wall 202. The material from which the retaining ring 206 is made may be any suitable material, and may be the same as or different from the material from which the contact wall 203 and/or the expansion wall 202 is made.

As shown in fig. 1 and 3, a skeleton 3 disclosed in the present application is shown. The skeleton 3 is generally rigid. The skeleton 3 may include a receiving portion 31. The accommodating portion 31 defines the accommodating space 4. The receiving portion 31 may include an L-shaped member 311, a T-shaped member 312, and a protrusion on the T-shaped member 312 extending in a radially outward direction. The L-shaped part 311 and the T-shaped part 312 are connected to each other. The L-shaped member 311 includes a third section 311c of the L-shaped member located axially outward. The T-shaped member 312 includes a second section 312b that extends generally axially. The third section 311c of the L-shaped member and the second section 312b of the T-shaped member are connected to each other. In an axially inward direction, the L-shaped member extends beyond the T-shaped member.

The accommodation space 4 may include a fixing groove 313' which is fitted to the fixing ring 206 of the inflatable tire 2. The axially inner surface of the fixing groove 313' is defined by a projection on the T-shaped member 312.

In one embodiment, as shown in fig. 3, the L-shaped member 311 includes a first section 311a, a second section 311b, and a third section 311 c. The second section 311b extends substantially parallel to the axial direction, and the second section 311b includes opposite ends in the axial direction. The first section 311a is connected to an axially inner end of the second section 311b and extends a distance in a radially inward direction. In one embodiment, the included angle between the inner surface of the first section 311a and the inner surface of the second section 311b is 90 degrees; in another embodiment, the included angle between the inner surface of the first section 311a and the inner surface of the second section 311b is less than 90 degrees. The third section 311c is connected to the other end of the second section 311b on the axially outer side and extends in the radially inward direction by a distance longer than the distance by which the first section 311a extends, and is connected to the T-shaped member 312. In one embodiment, the framework 3 includes a through-hole 316. The through-hole 316 may be disposed at the third section 311 c.

In one embodiment, T-shaped member 312 may include a first section 312a and a second section 312 b. The first section 312a includes a first surface 312a extending substantially in an axial direction₁And a second surface 312a connected thereto extending substantially radially and located axially inward₂. The second section 312b includes a first surface 312b extending generally axially and radially outward₁. At the first surface 312b of the second section 312b₁Has a radially outwardly extending protrusion near the axially outer side. The protrusions define the surface of the axially inner side of the fixing groove 313'. The second section 312b extends substantially in the axial direction, and the second section 312b includes two opposite ends in the axial direction. The first section 312a is connected to an axially inner end of the second section 312b and extends a distance in a radially outward direction. Of the first section 312aSecond surface 312a₂And a first surface 312b of the second section 312b₁The included angle of (a) is equal to or slightly greater than 90 degrees. The second section 312b is connected at the other end to the L-shaped member 311. First surface 312b of second section 312b of T-shaped member 312₁The angle between the inner surface of the third section 311c of the L-shaped member 311 may be greater than 90 degrees.

In the case where the inflatable pneumatic tyre 2 is used in cooperation with the carcass 3, the inflatable pneumatic tyre 2 is embedded in the housing space 4 defined by the carcass 3. The molding wall 201 is not in contact with the frame 2. The contact wall 203 contacts and/or conforms closely to the inner surface of the L-shaped member 311 of the armature 3. The expansion wall 202 is connected at one end to the forming wall 201; the expansion wall 202 is connected at the other end to the contact wall 203. An expansion cavity 41 is defined by the inner surface of the T-shaped member 312 and the tire body 20. The skeleton 3 further comprises a through hole 316 and at least one breathing hole 317. The through hole 316 is provided to be suitable for the passage of an inflation nozzle in the case of the cooperative use of the inflatable pneumatic tire 2 and the frame 3, without affecting the close fitting between the tire body 20 and the frame 3. One end of the at least one breathing hole 317 is disposed at the inner surface of the T-shaped member 312 to communicate the expansion cavity 41 with the external atmosphere, so that the air pressure in the expansion cavity 41 is always balanced with the external atmosphere.

In one embodiment of the present application, the framework 3 may optionally further comprise a mudguard 32. The fender 32 may be of any suitable and/or application-specific configuration and/or configuration known in the art, and may include a connecting section (which may be sloped (e.g., for large-gauge cast pipe) or formed as a unitary piece in the same plane (e.g., for small-gauge cast pipe)) and a sheltering section. The mudguard 32 may be connected to the receiving portion 31 by a connecting section. The shielding section can be closed or provided with an opening for the inlet and outlet of a distributing pipe for injecting cement into the casting pipe (5).

As shown in fig. 1 and 2, a stopper device 1 comprising said carcass 3 and an inflatable pneumatic tyre 2 is shown, as disclosed in the present application. The features relating to the inflatable pneumatic tyre 2 and the carcass 3 are as described above. The method of use of the choke device 1 is described in detail below.

First, the inflatable pneumatic tire 2 is inserted into the receiving portion of the carcass 331 in the receiving space 4 defined by the L-shaped part 311 and the T-shaped part 312. The relative positions of inflatable pneumatic tire 2 and carcass 3 are adjusted so that inflation nozzle 26 passes through-hole 316 of carcass 3 and the outer end of inflation nozzle 26 is exposed to the outside atmosphere, so that contact wall 203 of tire body 20 is fitted to the inner surface of L-shaped member 311 of carcass 3, so that at least part of expansion wall 202 and surface 312a of T-shaped member 312₂、312b₁An expansion cavity 41 is defined, wherein the fixing ring 206 of the inflatable tyre 2 is fastened in the fixing groove 313' defined by the carcass. In this way, the remaining portions of the forming wall 201 and the expansion wall 202 other than the at least part are exposed to view. In this way, the inflatable pneumatic tyre 2 is in the first condition (non-inflated condition).

Then, the plug device 1 is externally inserted into the socket 51 of the cast tube 5 so that the molding wall 201 is fitted to the socket 51. Then, the inside of the carcass body 20 is filled with an inflation medium through the inflation nozzle 26, so that the molding wall is further fastened to the socket 51 of the casting tube 5; at the same time, a portion of the expansion wall 202 is on the surface 312a of the T-shaped member 312₂、312b₁The expansion cavity 41 gradually shrinks until disappearing, and the part of the expansion wall 202 gradually and closely adheres to the surface 312a of the T-shaped part 312₂、312b₁. The remaining part of the expansion wall 202 other than the portion extends axially and is caused to abut against the first surface 312a of the first section 312a of the T-shaped member in the radial direction₁. In this way, the plug device is fastened to the socket 51 of the casting tube 5. Thus, the inflatable pneumatic tire 2 reaches the second state (inflated state).

In one embodiment of the application, the framework 3 has openings in the mudguard 32 through which a distribution pipe for cement injection can be extended into the casting pipe 5. Next, the cast pipe 5 with the plug device 1 fastened thereto is rotated at high speed along its central axis by a power device. The inner wall of the cast pipe 5 is uniformly coated with the cement slurry by centrifugal action, and a cement lining layer 52 with certain hardness and adhesive force is gradually formed. In the process, the inflatable pneumatic tyre 2 is in the second condition (inflated condition).

Finally, forming the cement liningAfter layer 52, the inflation medium within inflatable bladder 2 is deflated and inflation wall 202 is disposed on surface 312a of T-shaped member 312₂、312b₁Regularly retracting in a defined telescopic path, the expansion cavity 41 being regenerated and gradually increasing, the expansion wall 202 and the surface 312a of the T-shaped part 312₂、312b₁And (5) separating. In this way, the expansion cavity 41 is reformed. In this way, the inflatable pneumatic tyre 2 returns to the first condition.

One end of at least one breathing hole 317 is arranged on the surface 312a of the T-shaped component 312₂、312b₁The expansion cavity 41 is communicated with the external atmosphere, so that the air pressure in the expansion cavity 41 is always balanced with the external atmosphere, thereby avoiding the influence on the service life of the plug device 1 and/or the increase of the labor load caused by the suction of working media (such as precipitated water and/or unconsolidated cement slurry) in the expansion cavity 41 in the deflation process.

Now, the plug device 1 can be easily removed from the cast pipe socket 51 without sticking off the cement lining 52.

In one embodiment, the contoured wall 201 includes a first portion 201a, a second portion 201b, and a third portion 201c that are sequentially connected. The first portion 201a of the profiled wall extends substantially in the axial direction. The first portion 201a of the profiled wall 201 is fitted to the outer surface of the cast tube 5 when the plug device 1 is mounted to the cast tube 5. When the inflatable pneumatic tyre 2 is inflated, the first portion of the forming wall 201a exerts a pressure inwards in the radial direction, so that the first portion of the forming wall 201a abuts and tightly abuts against the outer surface of the casting tube. The second portion 201b of the shaped wall is shaped as a chamfered shape to fit the end of the cast tube. The second portion 201b of the profiled wall is fitted to the chamfered surface of the cast tube 5 when the plug device 1 is mounted to the cast tube 5. When the inflatable pneumatic tyre 2 is inflated, the second portion 201b of the forming wall abuts and snugly abuts against the chamfered surface of the casting tube. The third portion 201c of the shaped wall is shaped to match the end surface of the cast tube. The third portion 201c of the profiled wall is fitted to the end face of the cast tube 5 when the plug device 1 is mounted to the cast tube 5. When the inflatable pneumatic tire 2 is inflated, the third portion 201c of the mold wall contacts the end face of the casting tube 5 and applies pressure in an axially inward direction so that it abuts and closely conforms to the end face of the casting tube.

In one embodiment, the expansion wall 202 includes a first portion 202a, a second portion 202b, a third portion 202c, a fourth portion 202d, and a fifth portion 202e connected in series.

The first portion 202a is connected at one end to the shaped wall 201 and at the other end to the second portion 202b of the expansion wall. The angle between the outer surface of the first portion 202a and the outer surface of the second portion 202b may be slightly greater than 90 degrees. When the inflatable pneumatic tyre 2 is inflated, the first portion 202a of the expansion wall moves in a second direction of substantially axial direction until the expansion cavity 41 disappears and substantially maintains its angle with the forming wall 201.

The outer surface of the second portion 202b extends substantially in the axial direction. The second portion 202b is connected at one end to the first portion 202a of the expansion wall and at the other end (i.e., corner a) to the third portion 202c of the expansion wall. Generally, in the uninflated state, the angle between the outer surface of the second portion 202b of the expansion wall and the outer surface of the third portion 202c of the expansion wall is less than 90 degrees, and gradually increases to greater than 90 degrees as the inflation expands. When the plug device 1 is mounted to the cast tube 5 and is not yet inflated, the corner a of the second portion 202b connected to the third portion 202c may push against the first surface 312a of the first section 312a of the T-shaped member₁. Said corner (A) being along a first surface (312a) of a first section of the T-shaped member when the inflatable tyre 2 is inflated₁) Is guided by sliding, forces the expansion wall (202) to deform, while the second portion (202b) of the expansion wall deforms by expansion in a second direction substantially axial direction until the expansion cavity (41) disappears completely; the angle between the outer surface of the second portion of the expansion wall 202b and the outer surface of the third portion of the expansion wall 202c gradually increases from less than 90 degrees to greater than 90 degrees.

The third portion 202c of the expansion wall is connected at one end (i.e., corner a) to the second portion 202b and at the other end to the fourth portion 202d of the expansion wall. Generally, in the uninflated state, the angle between the outer surface of the third portion 202c of the expansion wall and the outer surface of the fourth portion 202d of the expansion wall is less than 90 degrees, and upon inflation expandsIn this state, the angle gradually increases to more than 90 degrees. When mounting the stopper device 1 to the casting tube 5, the corner a of the third portion 202c of the expansion wall connected to the second portion 202b may push against the first surface 312a of the first section 312a of the T-shaped part₁. When the inflatable pneumatic tire 2 is inflated, the corner portion A is on the first surface 312a₁Sliding upwards, the other end of the third portion 202c of the expansion wall, connected to the fourth portion 202d, gradually approaches the first surface 312a of the first section 312a of the T-shaped part₁And a second surface 312a₂Until coinciding with each other, while the third portion 202c of the expansion wall is deformed in expansion in the second substantially axial direction, so that the third portion 202c of the expansion wall is in close abutment with the first surface 312a of the first section 312a of the T-shaped member₁(ii) a The angle between the outer surface of the third portion of expansion wall 202c and the outer surface of the fourth portion of expansion wall 202d becomes progressively larger, increasing from less than 90 degrees to greater than 90 degrees.

It should be noted that the "second substantially axial direction" refers to the direction defined by the first surface 312a of the first section of the T-shaped member₁An axially inward direction defining a taper of no more than 10 °, optionally no more than 5 °, about the axis. The taper may diverge from an axially inward direction or an axially outward direction.

The fourth portion 202d is connected at one end thereof to the third portion 202c and at the other end to the fifth portion 202 e. Generally, the angle between the outer surface of the fourth portion 202d and the outer surface of the fifth portion 202e is less than 90 degrees when uninflated and gradually increases to equal to or greater than 90 degrees when inflated. When the plugging device 1 is mounted to the cast pipe, but not yet inflated, the fourth portion 202c does not contact any portion of the skeleton 3. When the inflatable pneumatic tire 2 is inflated, the fourth portion 202c is deformed to expand generally in a first direction having axial and longitudinal components until contacting and conforming closely to the second surface 312a of the first section of the T-shaped member₂While the angle between the outer surface of the fourth portion 202d and the outer surface of the fifth portion 202e gradually increases from less than 90 degrees to equal to or greater than 90 degrees.

Fifth part 202eConnected at one end to the fourth portion 202d and at the other end to the contact wall 203. The fifth portion 202e is generally parallel to the first surface 312b of the second section of the T-shaped member₁The direction is extended. A fixing ring 206 is attached to the end of the fifth portion 202e that is connected to the contact wall 203. When the plugging device 1 is mounted to the cast tube, yet uninflated, the fifth portion 202e is not in contact with any portion of the skeleton 3; the fixing ring 206 is fastened in a fixing groove 313' defined by the frame. When inflatable tyre 2 is inflated, fifth portion 202e moves in expansion radially inwards, the end of fifth portion 202e connected to contact wall 203 abutting against the projection above the fixing groove 313', and the end of fifth portion 202e connected to fourth portion 202d moves in expansion until it contacts second surface 312a of the first section of the carcass₂And a first surface 312b of the second section₁Coincides with the fifth portion 202e being deformed in a first direction having axial and radial components so that the expansion cavity 41 is completely eliminated.

It should be noted that the above-mentioned "first direction having axial and radial components" refers to a direction axially and radially inward of the telescopic path defined by the expansion cavity 41.

In one embodiment, the contact wall 203 includes a first portion 203a, a second portion 203b, and a third portion 203c that are sequentially connected. The first portion 203a extends substantially in a direction to engage the inner surface of the first section 311a of the L-shaped member. The first portion 203a is connected at one end to the forming wall 201 and at the other end to the second portion 203b of the contact wall. Upon installation of the plugging device 1 to the casting tube 5, the first portion 203a contacts the first section 311a of the L-shaped member. When inflatable pneumatic tire 2 is inflated, first portion 203a applies pressure to first section 311a of the L-shaped member to fit snugly thereon. The second portion 203b of the contact wall extends substantially in a direction to engage the inner surface of the second section 311b of the L-shaped member. The second portion 203b of the contact wall is connected at one end to the first portion 203a of the contact wall and at the other end to the third portion 203c of the contact wall. The second portion 203b contacts the second section 311b of the L-shaped member when the plug device 1 is installed on the casting tube 5. When inflatable tire 2 is inflated, second portion 203b applies pressure to second section 311b of the L-shaped member to fit snugly thereon. The third portion 203 of the contact wall extends substantially in a direction to engage the inner surface of the third section 311c of the L-shaped member. The third portion 203c of the contact wall is connected at one end to the second portion 203b of the contact wall and at the other end to the expansion wall 202. Upon installation of the plugging device 1 to the casting tube 5, the third portion 203c contacts the third section 311c of the L-shaped member. When inflatable pneumatic tire 2 is inflated, third portion 203c applies pressure to third section 311c of the L-shaped member to fit snugly thereon.

In the embodiments of the present application, the vent 24 communicates the first chamber 22 and the second chamber 23 such that, when inflated, both the first chamber 22 and the second chamber 23 can be fully inflated, and when deflated, both the first chamber 22 and the second chamber 23 can be fully retracted.

In the embodiment of the present application, the pulling endless belt 21 restricts the expansion of the molding wall 201 in the axial direction, helping to cause the expansion wall 202 to expand or retract regularly in the telescopic path restricted by the T-shaped member 312 as described above, to prevent the cement inner liner 52 from being stuck off.

In the embodiment of the present application, when the inflatable tire 2 is used in cooperation with the carcass 3, the contact wall 203 of the tire body 20, which is in contact with the inner surface of the third section 311c of the L-shaped member of the carcass 3, is always (in both the first state and the second state) in close contact with the inner surface of the third section 311c of the L-shaped member of the carcass 3, regardless of whether the inflatable tire 2 is inflated or deflated.

In the present embodiment, when the inflatable pneumatic tire 2 is used in cooperation with the carcass 3, the fixing ring 206 of the inflatable pneumatic tire 2 is always (in both the first state and the second state) fastened in the fixing groove 313' of the carcass 3 regardless of whether the inflatable pneumatic tire 2 is inflated or deflated.

As shown in fig. 5A-B, in another embodiment of the present application, the carcass 20 of the inflatable tyre 2 can also comprise at least one anti-slip ring 204a and optionally at least one anti-slip rib 204B. The at least one anti-slip ring 204a is arranged on the profiled wall 201, preferably on the first portion 201a of the profiled wall 201. The at least one anti-slip ring 204a is radially distributed around the axis of the casting tube, and when inflated, the at least one anti-slip ring 204a provides a space to prevent the molding wall 201 from wrinkling due to expansion and affecting the tight fit of the tire and the casting tube.

Optionally, the inflatable pneumatic tire may further comprise at least one anti-slip rib 204 b. Said at least one anti-slip rib 204b is axially distributed and is connected at one end thereof to said at least one anti-slip ring 204a and at the other end thereof to the first portion 201a of the profiled wall. In one embodiment, as shown in fig. 5A, the outer surface of the anti-slip rib 204b may not be in the same cylindrical or conical surface as the outer surface of the first portion 201a of the profiled wall, but rather may be located in a cylindrical or conical surface at a radially outward distance with respect to the profiled wall, as shown in the enlarged partial view I in fig. 5A; in another embodiment, as shown in fig. 5B, the outer surface of the anti-slip rib 204B may be in the same cylindrical or conical surface as the outer surface of the first portion 201a of the profiled wall, as shown in the enlarged partial view I in fig. 5B. The anti-slip ring 204a and/or the anti-slip ribs 204b are used to secure the plug device 1 to the cast pipe 5, and are not easily detached even in the case where the cast pipe 5 is rotated at a high speed.

In the present embodiment, the inflatable pneumatic tyre 2 can be either disposable or reusable. This may depend, for example, on the material, manufacturing process and application purpose of which the inflatable pneumatic tire 2 is constructed.

In other embodiments of the present application, one end of the breathing hole 317 may be located on the surface of the T-shaped member 312 of the frame 3 defining the receiving space 4, and the other end may be open at any suitable location of the frame 3 leading to the outside atmosphere, and is not limited to being located on the same side as the through-hole 316 for the air charging nozzle 26.

In the present embodiment, the inflation nozzle 26 may be one or more. Accordingly, the through-holes 316 are configured to suit the number and shape of the inflation nozzles 26.

In the present embodiment, the inflation medium inside the inflatable pneumatic tire 2 can be any gas suitable for the needs of the particular situation, including but not limited to inert gases such as air and/or nitrogen. In some cases, the expansion medium is not limited to a gas, but also includes, for example, a liquid. Accordingly, the inflation nozzle 26 described herein is not limited to use for filling with gas, but may be used in any suitable device for filling with an inflation medium.

In embodiments of the present application, the tire may further include other chambers (e.g., third chamber, etc.) in addition to the first chamber 22 and the second chamber 23, which may be used to further maintain the angle of the mold wall and prevent the tire body 20 from shifting.

Although cement linings are exemplified in the present application, the scope of application of the present application is not limited to cement linings.

Although the carcass 3, inflatable bladder 2 and stopper device 1 of the present application are described in the present application with the use of a cast tube socket as an example, the carcass 3, inflatable bladder 2 and stopper device 1 of the present application may also be used for a socket of a cast tube.

Although the carcass 3, inflatable bladder 2 and stopper device 1 of the present application are described in the context of a cast pipe, the scope of application of the carcass 3, inflatable bladder 2 and stopper device 1 of the present application is not limited to cast pipes, but may also be used for other pipes requiring sealing, similar to cast pipes.

Although the present application has been described herein with reference to particular embodiments, the scope of the present application is not intended to be limited to the details shown. Various modifications may be made to these details without departing from the underlying principles of the application.

Claims

1. An inflatable pneumatic tyre (2) for lining cast tubes (5) adapted to cooperate with a carcass (3) to form a stopper device (1), said pneumatic tyre (2) comprising:

a carcass (20) substantially L-shaped in cross section and internally hollow, said carcass (20) comprising a shaped wall (201), an expansion wall (202) and a contact wall (203) connected to each other and a retaining ring (206) connected to the junction of the contact wall (203) and the expansion wall (202), wherein the shaped wall (201) is suitable for casting a tube (5), the expansion wall (202) is adapted to be expandable within a carcass (3), the contact wall (203) is adapted to contact the carcass (3), and wherein the expansion wall (202) comprises a first portion (202a), a second portion (202b), a third portion (202c), a fourth portion (202d) and a fifth portion (202e) connected in sequence, the second portion (202b) and the third portion (202c) being connected to a corner (a);

an inflation nozzle (26) connected to the carcass (20) for inflating the inflatable carcass (2) with an inflation medium to inflate the inflatable carcass (2);

a pulling annulus (21) located on the inner wall surface of the rubber tyre body (20) and respectively limiting a first chamber (22) and a second chamber (23), wherein the first chamber (22) extends along the axial direction, the second chamber is approximately V-shaped, and the pulling annulus (21) is used for limiting the axial expansion of the forming wall (201) so as to maintain the angle of the forming wall and prevent the plug device (1) from falling off; and

at least one vent (24) distributed on the pulling loop strap (21) and configured to communicate the first chamber (22) and the second chamber (23);

and wherein the angle between the outer surface of the third portion (202c) of the expansion wall and the outer surface of the fourth portion (202d) of the expansion wall is less than 90 degrees when not inflated and gradually increases as the second chamber (23) expands when inflated.

2. Inflatable pneumatic tyre (2) according to claim 1, wherein said tyre body (20) further comprises at least one anti-slip ring arranged on the forming wall (201) to ensure the fastening of the stopper device (1) on the casting tube (5);

optionally, the rubber tyre body (20) further comprises at least one anti-slip rib.

3. Inflatable pneumatic tyre (2) according to claim 1, wherein the angle between the outer surface of the first portion (202a) of the inflated walls (202) and the outer surface of the second portion (202b) of the inflated walls (202) is greater than 90 degrees.

4. An inflatable pneumatic tyre (2) as claimed in claim 1, wherein the outer surface of the second portion (202b) of the expansion wall (202) extends substantially in an axial direction, and wherein, in the non-inflated condition, the angle between the outer surface of the second portion (202b) of the expansion wall and the outer surface of the third portion (202c) of the expansion wall is less than 90 degrees and increases progressively as it inflates.

5. A carcass (3) for lining a cast tube (5), suitable for cooperating with an inflatable carcass (2) to form a stopper device (1), said carcass (3) comprising a housing portion (31) defining a housing space (4), said housing space (4) comprising fixing slots (313'),

and wherein the housing portion (31) comprises: an L-shaped part (311) and a T-shaped part (312) connected to each other at one end, wherein in an axial direction the L-shaped part (311) extends beyond the T-shaped part (312), and wherein the T-shaped part (312) comprises a first section (312a) extending substantially in a radial direction and a second section (312b) extending substantially in an axial direction connected to each other, and a protrusion located on the second section (312b) and extending radially outward, the protrusion defining an axially inner side surface of the fixation groove (313');

and wherein the first section (312a) of the T-shaped member (312) comprises a first surface (312a) extending substantially axially₁) And a second surface (312a) extending substantially radially₂) Its radially outer end and the first surface (312a)₁) The second section (312b) of the T-shaped member (312) includes a first surface (312b) extending generally axially₁) An axially inner end thereof connected to the second surface (312a) of the first section (312a)₂) The radially inner end of the inner tube,

and wherein, the L-shaped component (311) of the framework (3) is provided with a through hole (316) which can be communicated with the outside atmosphere, and the T-shaped component (312) of the framework (3) is provided with at least one breathing hole (317) which can be communicated with the outside atmosphere.

6. A skeleton (3) according to claim 5, further comprising: a fender (32) connected to the housing portion (31) and configured to be closed or to have an opening for feeding a distributing pipe for injecting cement into the casting pipe (5).

7. A plug device (1) for lining cast tubes (5), comprising: the inflatable pneumatic tyre (2) of any one of claims 1 to 4 and the carcass (3) of any one of claims 5 to 6, wherein the accommodation space (4) of the carcass (3) is adapted to receive the tyre body (20) of the inflatable pneumatic tyre (2), the through-going hole (316) of the carcass (3) is configured to fit the inflation nozzle (26) of the inflatable pneumatic tyre (2) therethrough, the securing slot (313') is configured to fit the securing ring (206), the inflatable pneumatic tyre (2) has a first non-inflated state and a second inflated state, and wherein,

before inflation, the inflatable tyre (2) is in a first state, the tyre body (20) is fitted into the L-shaped part (311) of the carcass (3) and defines with the T-shaped part (312) of the carcass (3) an expansion cavity (41), said expansion cavity (41) defining the normal telescopic path of the inflatable tyre (2),

upon inflation, the carcass (20) expands, the first (202a), second (202b) and third (202c) portions of the expansion wall (202) are deformed in an expanded manner in a second substantially axial direction, the fourth (202d) portion of the expansion wall (202) and the fifth (202e) portion of the expansion wall (202) are deformed in a regular expanded manner in a first direction having an axial direction and a radially inward direction in said defined expansion path until they are in close contact with the inner surface of the T-shaped member (312), the inflatable carcass (2) is in a second state, and

after deflation, the inflatable pneumatic tyre (2) returns to the first condition, the tyre body (20) retracts, the fourth portion (202d) and the fifth portion (202e) of the inflated wall (202) are separated from the T-shaped part (312) of the carcass (3), and the inflated moulding cavity (41) is formed again.

8. Plug device (1) according to claim 7, wherein in the second condition the third portion (202c) of the expansion wall is in close abutment with the first surface (312a) of the first section of the T-shaped member₁) A fourth portion (202d) of the expansion wall closely conforms to the second surface (312a) of the first section of the T-shaped member₂) And the fifth portion (202e) of the expansion wall is in close proximity to the first surface (312b) of the second section of the scaffold₁)。

9. The plug device (1) according to claim 7, wherein said fixing ring (206) is further configured to: when the inflatable rubber tire (2) is used in cooperation with the framework (3), the fixing ring (206) is fastened in the fixing groove (313') in the first state or the second state.

10. Plug device (1) for a cast pipe (5) according to claim 7, wherein, in the non-inflated condition, the corner (A) pushes against a first surface (312a) of a first section of a T-shaped part₁) And during inflation said corner (A) follows a first surface (312a) of a first section of the T-shaped part₁) Is slid to be guided, and the expansion wall (202) is forced to deform.