CN112008853A - Inflatable tires, skeletons and plug devices for casting pipe lining - Google Patents

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 tires, skeletons and plug devices for casting pipe lining

technical field

The present application relates to an inflatable rubber tire for casting pipe lining (especially suitable for casting pipe lining with a small end face angle of the coating layer), a frame suitable for the inflatable rubber tire, and the frame and the inflatable rubber tire plug device.

Background technique

In the production process of the cast pipe, in order to prolong the service life of the cast pipe and the cleanliness of the conveying medium, it is often necessary to form a coating layer on the inner wall of the cast pipe. A common practice is to apply a cement coating with a thickness of more than 2mm. Usually, a plug device is used to seal both ends of the casting pipe; then the cement is injected into the casting pipe, and through the high-speed rotation of the casting pipe, the centrifugal action is used to make the cement slurry gradually form on the inner wall of the casting pipe with a uniform thickness, a certain hardness and Adhesive cement coating, water may be precipitated during this process; finally, the plug device is disassembled and removed, and the precipitation water can be released.

However, for a long time, in the process of disassembling and removing the plug device, the plug often sticks off the cement coated on the end face of the casting pipe. Therefore, field workers are often required to manually refinish the cement coating to ensure the integrity of the cement lining coated on the inner wall of the cast pipe. This not only prolongs the working time and inefficiency of the coating operation, but also causes the on-site environment to be polluted by working media such as cement due to manual repair, which increases the difficulty of subsequent cleaning. In addition, the adhesion of the cement coating and the inner wall of the cast pipe to the cast pipe manufactured by this post-repair is also affected. In some cases, it is also possible to require a smaller face angle for the lining.

Therefore, there is an urgent need to provide a rubber tire, a skeleton and a plug device to prevent or at least reduce the sticking of the cement on the end face of the casting pipe, reduce the manpower burden and maintain the cleanliness of the work site environment, and can also meet the requirements of the end face angle of the lining layer. small request.

SUMMARY OF THE INVENTION

The present application aims to provide an inflatable rubber tire for casting pipe lining, a skeleton suitable for the inflatable rubber tire, and a plug device including the skeleton and the inflatable rubber tire, which are advantageous over the prior art in at least one aspect .

To this end, the present application provides, in one aspect, an inflatable rubber tire for casting pipe lining, suitable for cooperating with a frame to form a plug device, the inflatable rubber tire comprising:

A rubber tire body having a substantially L-shaped cross-section and a hollow interior, the rubber tire body comprising a forming wall, an expansion wall and a contact wall connected to each other, and a fixing ring connected to the junction of the contact wall and the expansion wall, wherein, The forming wall is suitable for casting the pipe, the expansion wall is adapted to expand within the framework, the contacting wall is adapted to contact the framework, and wherein the expansion wall comprises a first portion, a second portion, a third portion, a fourth portion and The fifth part, the second part and the third part are connected to the corner;

an inflation nozzle, which is connected to the rubber tire body, and is used for filling the inside of the inflatable rubber tire with an inflation medium to inflate the inflatable rubber tire;

A pulling ring, which is located on the inner wall surface of the rubber tire body and defines a first chamber and a second chamber respectively, the first chamber generally extends in the axial direction, and the second chamber is generally V-shaped, and the pulling ring is used to limit Axial expansion of the formed wall to maintain the angle of the formed wall and to prevent the plug device from falling off; and

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

And wherein, when not inflated, the angle between the outer surface of the third part of the expansion wall and the outer surface of the fourth part of the expansion wall is less than 90 degrees, and when inflated, with the expansion of the second chamber, so The included angle gradually increases.

Optionally, the rubber tire body further includes at least one slip-proof ring, which is arranged on the forming wall to ensure that the plug device is fastened on the casting pipe;

Optionally, the rubber tire further includes at least one anti-stripping rib.

Optionally, the angle between the outer surface of the first portion of the expansion wall and the 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 axially, and wherein, in the non-inflated state, there is a gap between the outer surface of the second portion of the expansion wall and the outer surface of the third portion of the expansion wall. The included angle is less than 90 degrees and gradually increases as the inflation expands.

In another aspect, the present application provides a skeleton for casting pipe lining, adapted to cooperate with an inflatable rubber tire to form a plug device, the skeleton includes a receiving portion defining an accommodating space, the accommodating space includes a fixing groove,

and wherein the receiving portion includes: an L-shaped part and a T-shaped part connected to each other at one end, wherein, in the axial direction, the L-shaped part extends beyond the T-shaped part, and wherein the T-shaped part includes connected to each other a first section extending substantially in the radial direction and a second section extending substantially in the axial direction and a protrusion located on the second section and extending radially outward, the protrusion defining the axis of the fixing slot the inner surface;

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

And wherein, the L-shaped member of the frame is provided with a through hole that can communicate with the outside atmosphere, and the T-shaped member of the frame is provided with at least one breathing hole that can communicate with the outside atmosphere.

Optionally, the skeleton further comprises: a fender connected to the accommodating portion, which is configured to be closed or has an opening for supplying a placing pipe for injecting cement into the casting pipe.

In yet another aspect, the present application provides a plug device for casting pipe lining, comprising any of the above-mentioned inflatable rubber tires and any of the above-mentioned skeletons, wherein the receiving space of the skeleton is adapted to receive the inflatable rubber tires. The rubber tire body of the pneumatic rubber tire, the through hole of the skeleton is configured to be suitable for the inflating nozzle of the inflatable rubber tire to pass through, the fixing groove is configured to be suitable for the fixing ring, and the inflatable rubber tire has a non-inflatable rubber tire. a first state and an inflated second state, and wherein,

Before inflation, in the first state of the inflatable rubber tire, the rubber tire body is fitted into the L-shaped part of the skeleton, and an expansion cavity is defined between the T-shaped part of the skeleton, and the expansion cavity defines the specification of the inflatable rubber tire expansion path,

When inflated, the rubber tire body expands, the first part, the second part and the third part of the inflatable wall are inflated and deformed in a second substantially axial direction, and the fourth part of the inflatable wall and the fifth part of the inflatable wall are in the defined In the expansion and contraction path, the expansion and deformation are normalized along the first direction with the axial and radial inward direction until it closely fits the inner surface of the T-shaped member, so that the expansion cavity disappears, and the inflatable rubber tire is in the second state, and

After deflation, the inflatable rubber tire returns to the first state, the rubber tire body is retracted, the fourth and fifth parts of the expansion wall are separated from the T-shaped parts of the skeleton, and the expansion type is formed again.

Optionally, in the second state, the third portion of the expansion wall is in close contact with the first surface of the first section of the T-piece, and the fourth portion of the expansion wall is in close contact with the first section of the T-piece the second surface of the segment, and the fifth portion of the expansion wall is in close contact with the first surface of the second segment of the skeleton.

Optionally, the fixing ring is further configured such that when the inflatable rubber tire is used in cooperation with the frame, the fixing ring is fastened in the fixing groove no matter 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 the inflation process, the corner portion runs along the first surface of the first section of the T-shaped member. The first surface slides and is guided, forcing the expansion wall to deform.

Therefore, the present application provides a plug device, so that an expansion cavity is formed between the pneumatic rubber tire and the frame, so that the forming wall of the pneumatic rubber tire can still expand and contract in a standard path under the action of air pressure, so as to prevent The cement coating on the inner wall of the cast pipe is stuck off by the plug device, and it also has many advantages, such as reducing labor costs, high efficiency, and preventing the deterioration of the field operation environment; When the inflatable rubber tire is deflated and the plug device is removed, the inflatable rubber tire can be accurately reset in the rigid frame, so as to ensure the re-formation of the expansion cavity.

Description of drawings

FIG. 1 shows a partial cross-sectional view of a casting head apparatus according to an embodiment of the present application, wherein the inflatable rubber tire is in a first state;

FIG. 2 shows a partial cross-sectional view of a die head apparatus according to an embodiment of the present application, wherein the inflatable tire is in a second state;

Figure 3 shows a partial cross-sectional view of one embodiment of a skeleton according to the present application;

Figure 4 shows a partial cross-sectional view of one embodiment of an inflatable rubber tire according to the present application; and

5A-B illustrate further embodiments of inflatable rubber tires according to the present application, wherein the inflatable rubber tire has a slip ring.

Detailed ways

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

It should be noted that, in this application, the terms "axial" and "radial" are defined relative to the direction of the casting pipe, which is oriented with the central axis of the casting pipe. The use of "axial" and "radial" is descriptive (meaning only the relative orientation of the components) and not limiting in any way (ie, not referring to a particular direction). The terms "axially inboard", "axially inwardly" refer to the direction towards the casting tube. The terms "radially inward", "radially inward" refer to the direction towards the axis of the cast tube.

As shown in FIG. 1 , the present application discloses an inflatable rubber tire 2 suitable for a skeleton, a skeleton 3 suitable for the inflatable rubber tire 2 , and a plug device 1 including the skeleton 3 and the inflatable rubber tire 2 .

As shown in FIGS. 1 and 4 , the inflatable rubber tire 2 disclosed in the present application is shown. The inflatable rubber tire 2 includes a rubber tire body 20 . The rubber tire body 20 may be made of any suitable stretchable material, including but not limited to rubber. The inside of the rubber tire body 20 is hollow to accommodate the inflation medium, and the inflation medium includes but is not limited to air. The inflatable rubber tire 2 includes a pull loop belt 21 inside the tire body 20 . The material of the pulling loop 21 can be rubber or any other suitable material. The pulling ring belt 21 divides the inside of the rubber tire body 20 into a first chamber 22 and a second chamber 23, wherein the first chamber 22 extends approximately in the axial direction, and the cross section of the second chamber 23 is approximately V-shaped, respectively. Extends substantially radially and axially. At least one ventilation hole 24 is distributed on the pulling loop belt 21 . The at least one vent hole 24 communicates with 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. Where there are two or more vent holes 24, the size and/or shape of each vent hole 24 may be the same or different. The tire body 20 includes a forming wall 201 , an expansion wall 202 and a contact wall 203 connected to each other. The profiled wall 201 is suitable for the casting tube 5 . The expansion wall 202 is adapted to be able to expand within the framework 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 installed on the contact wall 203 of the inflatable rubber tire 2 . An inner end of the inflation 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 rubber 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 the inflation process, the pulling loops 21 are stretched to keep the angle and shape of the forming wall 201 of the inflatable tire 2 substantially constant.

The rubber tire 2 disclosed in the present application may further include a retaining ring 206 . The fixing 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, which may be the same or different from the material from which the contact wall 203 and/or the expansion wall 202 are made.

As shown in Figures 1 and 3, the 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 part 311 , a T-shaped part 312 , and a protrusion on the T-shaped part 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 on the axial outer side. T-piece 312 includes a generally axially extending second section 312b. 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 accommodating space 4 may include a fixing groove 313 ′, which is fitted with the fixing ring 206 of the inflatable rubber tire 2 . The axially inner surface of the fixing groove 313' is defined by the protrusion 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 311c. 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 one end of the axial inner side of the second section 311b, and extends a distance in the radially inward direction. In one embodiment, the angle formed 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 inner surface of the first section 311a and the second section The angle formed by the inner surfaces of the segments 311b is less than 90 degrees. The third section 311c is connected to the other end of the axially outer side of the second section 311b, and extends a distance in the radially inward direction and is connected to the T-shaped member 312, wherein the distance, viewed in the radial direction, is longer than The distance the first section 311a extends. In one embodiment, the skeleton 3 includes through holes 316 . The through hole 316 may be arranged in the third section 311c.

In one embodiment, the T-piece 312 may include a first section 312a and a second section 312b. The first section 312a includes a substantially axially extending _first surface 312a1 and a substantially radially extending and axially inboard _second surface 312a2 connected thereto. The second section 312b includes a first surface 312b ₁ extending generally axially and radially outward. The first surface 312b ₁ of the second section 312b has radially outwardly extending protrusions proximate the axially outer side. The protrusion defines an axially inner surface of the fixing groove 313'. The second section 312b extends substantially in the axial direction, and the second section 312b includes 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. The included angle between the second surface 312a ₂ of the first section 312a and the first surface 312b ₁ of the second section 312b is equal to or slightly larger than 90 degrees. The second section 312b is connected to the L-shaped member 311 at the other end. The angle between the first surface 312b ₁ of the second section 312b of the T-shaped member 312 and the inner surface of the third section 311c of the L-shaped member 311 may be greater than 90 degrees.

When the inflatable rubber tire 2 is used in cooperation with the frame 3 , the inflatable rubber tire 2 is embedded in the accommodating space 4 defined by the frame 3 . The molding wall 201 is not in contact with the skeleton 2 . The contact wall 203 contacts and/or fits closely to the inner surface of the L-shaped part 311 of the skeleton 3 . The expansion wall 202 is connected to the profile wall 201 at one end; the expansion wall 202 is connected to the contact wall 203 at the other end. The expansion cavity 41 is defined by the inner surface of the rubber tire body 20 and the T-shaped member 312 . The frame 3 also includes a through hole 316 and at least one breathing hole 317 . The through hole 316 is set to be suitable for the penetration of the inflation nozzle when the inflatable rubber tire 2 and the frame 3 are used together, and at the same time, the tight fit between the rubber tire body 20 and the frame 3 is not affected. One end of the at least one breathing hole 317 is arranged on the inner surface of the T-shaped member 312 to communicate with the expansion cavity 41 and the outside atmosphere, so that the air pressure in the expansion cavity 41 is always balanced with the outside atmospheric pressure.

In an embodiment of the present application, optionally, the frame 3 may further include a fender 32 . Fenders 32 may be of any suitable configuration and/or configuration known in the art and/or suitable for a particular application, which may include connecting sections (which may be sloped (eg, for heavy gauge cast pipe) or Formed as a whole (eg, for small gauge cast pipes) and shielding segments in the same plane. The fender 32 may be connected to the accommodating portion 31 through a connecting section. The shielding section can be closed or has an opening, which is used to inject the cement into and out of the casting pipe (5).

As shown in FIG. 1 and FIG. 2 , the plug device 1 disclosed in the present application including the frame 3 and the inflatable rubber tire 2 is shown. The characteristics of the rubber tire 2 and the characteristics of the frame 3 are as described above. The method of using the plug device 1 will be described in detail below.

First, the inflatable rubber tire 2 is stuffed into the accommodating space 4 defined by the L-shaped part 311 and the T-shaped part 312 of the accommodating part 31 of the frame 3 . Adjust the relative positions of the inflatable rubber tire 2 and the frame 3 so that the inflation nozzle 26 passes through the through hole 316 of the frame 3 and the outer end of the inflation nozzle 26 is exposed to the outside atmosphere, so that the contact wall 203 of the rubber tire body 20 is fitted to the frame 3 The inner surface of the L-shaped part 311 so that at least part of the expansion wall 202 and the surfaces 312a ₂ , 312b ₁ of the T-shaped part 312 define the expansion cavity 41 , wherein the fixing ring 206 of the inflatable rubber tire 2 is fastened in the frame defined by in the fixing groove 313'. In this way, the remaining parts of the forming wall 201 and the expansion wall 202 other than the at least part are exposed and visible. In this way, the inflatable rubber tire 2 is in the first state (non-inflated state).

Then, the plug device 1 is externally inserted into the socket 51 of the casting tube 5 so that the profiled wall 201 is fitted to the socket 51 . Then, the expansion medium is filled into the rubber tire body 20 through the inflation nozzle 26, so that the molding wall is further fastened to the socket 51 of the casting pipe ₅ ; In the expansion and contraction path defined by 312b ₁ , the expansion cavity 41 gradually shrinks until it disappears, and the part of the expansion wall 202 gradually and closely fits the surfaces 312a ₂ and 312b ₁ of the T-shaped part 312 . The remainder of the expansion wall 202, other than said portion, extends axially and is brought into abutment in the radial direction against the first surface 312a ₁ of the first section 312a of the T-piece. In this way, the plug device is fastened to the socket 51 of the casting pipe 5 . In this way, the inflatable rubber tire 2 reaches the second state (inflated state).

In an embodiment of the present application, the fender 32 of the frame 3 has an opening, through which a distribution pipe for cement injection can be extended into the casting pipe 5 . Next, the casting pipe 5 to which the plug device 1 is fastened is rotated at a high speed along the central axis thereof by the power unit. Using centrifugal action, the cement slurry is uniformly coated on the inner wall of the casting pipe 5, and a cement inner lining layer 52 with certain hardness and adhesion is gradually formed. During this process, the inflatable rubber tire 2 is in the second state (inflated state).

Finally, after the cement inner lining layer 52 is formed, the expansion medium in the inflatable rubber tire 2 is released (deflated), and the expansion wall 202 can be shrunk in the expansion and contraction path defined by the surfaces 312a ₂ , 312b ₁ of the T-shaped member 312 normatively Then, the expansion cavity 41 is regenerated and gradually enlarged, and the expansion wall 202 is separated from the surfaces 312a ₂ , 312b ₁ of the T-shaped part 312 . In this way, the expansion cavity 41 is reformed. In this way, the inflatable rubber tire 2 returns to the first state.

Because one end of the at least one breathing hole 317 is arranged at the surfaces 312a ₂ and 312b ₁ of the T-shaped member 312 to communicate with the expansion cavity 41 and the outside atmosphere, so that the air pressure in the expansion cavity 41 is always balanced with the outside atmospheric pressure, thereby preventing the During the deflation process, working medium (such as precipitated water and/or unconsolidated cement slurry) is sucked into the expansion cavity 41 to affect the service life of the plug device 1 and/or increase the labor burden.

The plug device 1 can now be easily removed from the casting pipe socket 51 without sticking the cement lining 52 off.

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

The first portion 202a is connected at one end to the forming 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 tire 2 is inflated, the first portion 202a of the inflation wall moves in a second, substantially axial, direction until the inflation cavity 41 disappears, substantially maintaining its angle with the molding wall 201 .

The outer surface of the second portion 202b extends substantially axially. The second portion 202b is connected at one end to the first portion 202a of the expansion wall and at the other end (ie, corner A) to the third portion 202c of the expansion wall. Generally, in an uninflated state, the angle between the outer surface of the second portion 202b of the inflation wall and the outer surface of the third portion 202c of the inflation wall is less than 90 degrees, and the angle gradually increases with inflation to greater than 90 degrees. The corner A of the second part 202b connecting to the third part 202c may push against the first surface 312a ₁ of the first section 312a of the T-piece when the plug device 1 is installed to the casting pipe 5 and has not been inflated. . When the inflatable tire 2 is inflated, the corner (A) is guided by sliding along the first surface (312a ₁ ) of the first section of the T-piece, forcing the inflation wall ( 202 ) to deform and, at the same time, to expand The second portion 202b of the wall is expanded and deformed in a second direction generally in the axial direction until the expansion cavity 41 disappears completely; The angle gradually increases, from less than 90 degrees to more than 90 degrees.

The third portion 202c of the expansion wall is connected at one end (ie, 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 in the inflated state, the angle gradually increases to greater than 90 degrees. When installing the plug device 1 to the casting pipe 5, the corner A of the third part 202c of the expansion wall connected to the second part 202b can be pushed against the first surface 312a ₁ of the first section 312a of the T-piece . When the inflatable tire 2 is inflated, the corner A slides on the first surface 312a ₁ , and the other end of the third portion 202c of the inflation wall connected to the fourth portion 202d gradually approaches the first section 312a of the T-shaped piece The junction of the first surface 312a ₁ and the second surface 312a ₂ of the first surface 312a 1 and the second surface 312a 2 are until coincident, and at the same time, the third part 202c of the expansion wall is expanded and deformed in the second direction along the substantially axial direction, so that the third part 202c of the expansion wall is closely fitted to the first surface 312a ₁ of the first section 312a of the T-piece; 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 gradually increases, from less than 90 increase to greater than 90 degrees.

It should be noted that the above-mentioned "substantially axial second direction" refers to a taper defined by the first surface 312a ₁ of the first section of the T-shaped member, with the axis as the generatrix having a taper not greater than 10°, optional not more than 5°, the axial inward direction. The taper may diverge from an axially inward direction, or may diverge from an axially outwards 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 202e. 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 in the uninflated condition, and gradually increases to be equal to or greater than 90 degrees in the inflated condition Spend. The fourth part 202c is not in contact with any part of the frame 3 when the plug device 1 is installed to the casting pipe and not yet inflated. When the inflatable tire 2 is inflated, the fourth portion 202c expands and deforms substantially in a first direction having axial and longitudinal components until it contacts and fits snugly against the second surface 312a ₂ of the first section of the T-piece , while the angle between the outer surface of the fourth part 202d and the outer surface of the fifth part 202e increases gradually, from less than 90 degrees to equal to or greater than 90 degrees.

The fifth portion 202e is connected to the fourth portion 202d at one end and to the contact wall 203 at the other end. The fifth portion 202e extends substantially parallel to the direction of the first surface 312b ₁ of the second section of the T-piece. A fixing ring 206 is connected to one end of the fifth part 202e connected to the contact wall 203 . The fifth part 202e is not in contact with any part of the frame 3 when the plug device 1 is installed to the casting pipe and not yet inflated; the retaining ring 206 is fastened in the retaining groove 313' defined by the frame. When the inflatable rubber tire 2 is inflated, the fifth part 202e expands and moves radially inward, the end of the fifth part 202e connected with the contact wall 203 abuts against the protrusion above the fixing groove 313', and the fifth part 202e and the The connected end of the fourth portion 202d expands and moves until it coincides with the junction of the second surface 312a ₂ of the first section of the skeleton and the first surface 312b ₁ of the second section, while the fifth portion 202e is moved in a direction having an axial and The first direction of the radial component expands and deforms, so that the expansion cavity 41 disappears completely.

It should be noted that the above-mentioned "first direction having axial and radial components" refers to an axially inward and radially inward direction of the expansion and contraction 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 connected in sequence. The first portion 203a extends substantially in a direction that fits over the inner surface of the first section 311a of the L-shaped member. The first portion 203a is connected at one end to the profile wall 201 and at the other end to the second portion 203b of the contact wall. When the plug device 1 is installed to the casting pipe 5, the first portion 203a contacts the first section 311a of the L-shaped member. When the inflatable tire 2 is inflated, the first portion 203a applies pressure to the 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 fitted to 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 to the casting pipe 5. When the inflatable tire 2 is inflated, the second portion 203b applies pressure to the second section 311b of the L-shaped member to fit snugly thereon. The third portion 203 of the contact wall extends substantially in the direction of fitting to the inner surface of the third section 311c of the L-shaped member. The third portion 203c of the contact wall is connected to the second portion 203b of the contact wall at one end and to the expansion wall 202 at the other end. The third portion 203c contacts the third section 311c of the L-shaped member when the plug device 1 is installed to the casting tube 5. When the inflatable tire 2 is inflated, the third portion 203c applies pressure to the third section 311c of the L-shaped member to fit snugly thereon.

In the embodiment of the present application, the vent hole 24 communicates the first chamber 22 and the second chamber 23, so that during inflation, both the first chamber 22 and the second chamber 23 can be fully inflated, and during deflation, the first chamber 22 and the second chamber 23 are fully retractable.

In the embodiment of the present application, the pulling band 21 restricts the expansion of the forming wall 201 in the axial direction, which helps to allow the expansion wall 202 to expand or retract properly in the expansion and contraction path limited by the T-shaped member 312 as described above. , to prevent the cement lining 52 from sticking off.

In the embodiment of the present application, when the inflatable rubber tire 2 is used in conjunction with the frame 3, the contact wall 203 of the rubber tire body 20 that is in contact with the inner surface of the third section 311c of the L-shaped member of the frame 3 is always (in the Both the first state and the second state) closely fit the inner surface of the third section 311c of the L-shaped member of the frame 3, regardless of whether the inflatable tire 2 is inflated or deflated.

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

As shown in FIGS. 5A-B, in another embodiment of the present application, the rubber tire body 20 of the inflatable rubber tire 2 may further include at least one slip-proof ring 204a and optionally at least one slip-proof rib 204b. The at least one slip-off prevention ring 204a is arranged on the profiled wall 201 , preferably on the first portion 201a of the profiled wall 201 . The at least one slip-off prevention ring 204a is radially distributed with the casting pipe axis as the center. When inflated, the at least one slip-off prevention ring 204a provides a space to prevent the forming wall 201 from folds due to expansion and affecting the rubber tire and casting. The tight fit of the tube.

Optionally, the inflatable rubber tire may further include at least one anti-slip rib 204b. The at least one slip-off rib 204b is distributed in the axial direction and is connected at one end to the at least one slip-off ring 204a and at the other end to the first part 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 forming wall, but rather be positioned radially outwardly relative to the forming wall In another embodiment, as shown in FIG. 5B, the outer surface of the anti-stripping rib 204b may be in contact with the outer surface of the first portion 201a of the forming wall. The surfaces are in the same cylindrical or conical surface, as shown in the partial enlarged view I in Figure 5B. The slip-proof ring 204a and/or the slip-proof rib 204b are used to ensure that the plug device 1 is fastened on the casting pipe 5, and is not easy to fall off even when the casting pipe 5 rotates at a high speed.

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

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 that defines the receiving space 4, and the other end may be opened at any suitable position of the frame 3 that leads to the outside atmosphere , not limited to being on the same side as the through hole 316 for the inflation nozzle 26 .

In the embodiment of the present application, 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 embodiment of the present application, the inflation medium inside the inflatable rubber tire 2 may be any gas suitable for specific scenarios, including but not limited to inert gas such as air and/or nitrogen. In some cases, the expansion medium is not limited to gases, but also includes, for example, liquids. Accordingly, the inflation nozzle 26 described in the present application is not limited to being used for filling gas, but can be used for filling any suitable inflation medium.

In the embodiment of the present application, the rubber tire may further include other chambers (eg, a 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 molding wall and prevent the rubber tire body 20 from moving bit.

Although cement lining is used as an example in this application, the application scope of this application is not limited to cement lining.

Although the skeleton 3, the inflatable tire 2 and the plug device 1 of the present application are described in the present application with the use of a cast pipe socket as an example, the skeleton 3, the inflatable tire 2 and the plug device 1 of the present application also Can be used for sockets of cast pipes.

Although the frame 3, the inflatable rubber tire 2 and the plug device 1 of the present application are described in the embodiment of the casting pipe, the application scope of the frame 3, the inflatable rubber tire 2 and the plug device 1 of the present application is not limited For cast pipes, it is also used for other pipes that require sealing similar to cast pipes.

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

Claims (10)

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.

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