CN112622253A

CN112622253A - Plugging ball type pipeline expanding device

Info

Publication number: CN112622253A
Application number: CN202110105723.8A
Authority: CN
Inventors: 何虹钢; 王添; 吴辉茂; 邓海波
Original assignee: Yibin University
Current assignee: Yibin University
Priority date: 2021-01-26
Filing date: 2021-01-26
Publication date: 2021-04-09

Abstract

The invention relates to a plugging ball type pipeline expanding device, and belongs to the field of pipeline construction. The technical scheme is as follows: the blocking ball is arranged in the pipeline, the shell is arranged outside the pipeline, and the blocking ball expands after being inflated or filled with water to expand the pipeline. According to the invention, the shell is used as a mold, the shape and size of the thermoplastic pipeline after diameter expansion are controllable, and the diameter expansion can be conveniently carried out according to the installation and design requirements; the end covers and the inhaul cables are arranged at the two ends of the plugging ball, axial deformation of the air bag body is restrained, and bearing pressure of the air bag body can be greatly improved.

Description

Plugging ball type pipeline expanding device

Technical Field

The invention relates to the field of pipeline construction, in particular to diameter expanding construction of a thermoplastic pipeline.

Background

Polyvinyl chloride pipe, polyethylene pipe, polypropylene pipe, polyformaldehyde pipe etc. have advantages such as with low costs, corrosion-resistant, construction of being convenient for, and the wide application is in fields such as oil and gas transmission, city gas, water pipe network. At present, the pipelines are mainly connected in a hot melting butt joint mode, namely, the end parts of the pipelines are extruded together after being heated and softened. The construction of the connection mode is simpler, but the axial strength of the hot-melt connection part is lower due to the limitation of the characteristics of the polymer material; and the extruded part of the pipeline leaves a convex annular residue, so that the pipe cleaner is limited from passing through, and the pipeline is difficult to clean. This kind of connected mode, the convex cyclic annular of connection position is remained, is unfavorable for setting up the winding layer at the pipeline skin. In addition, due to the structural limitation of the two-section clamp of the pipeline, the large-caliber thin-wall pipeline is difficult to be connected in a hot-melting butt joint mode.

The flexible composite pipeline has excellent temperature resistance, good flexibility, light weight, low cost, outstanding corrosion resistance and permeation resistance, and is widely applied to the petrochemical industry. The pipeline mainly comprises an inner liner, a reinforcing layer and a protective layer from inside to outside. The inner liner, also called the transfer layer, usually consists of crosslinked polyethylene or polyethylene, having resistance to the penetration by small molecules; the reinforcement layer is formed by winding polyester fibers, glass fibers, aramid fibers, carbon fibers and other fiber materials in a staggered manner, so that the risk of hydrogen sulfide stress cracking is low, and the bearing capacity is high; the protective layer is composed of cross-linked polyethylene or polyethylene, and has excellent temperature resistance.

The connecting method of the composite material pipeline generally comprises two main types of mechanical pressing mode and non-mechanical pressing mode. The principle of the mechanical compression mode is that all layers of the composite pipe are compressed to the joint piece under the mechanical action, so that the axial load transmission is realized while the sealing is realized. Mechanically pressing and connecting, namely inserting a pagoda-type joint of a metal pipe fitting into the composite pipeline; then, a metal sleeve is sleeved outside the pipeline, and the pipeline is tightly pressed by screwing the metal sleeve. However, the high-pressure flexible composite material pipe has the reinforcing layer, and the structure of the reinforcing layer is easily damaged by adopting a mechanical compression mode. Particularly, for a flexible composite pipe with higher bearing capacity and a reinforcing layer made of a composite material with higher brittleness, once the reinforcing layer is damaged, load transmission is weakened, the pressure bearing capacity is reduced, and leakage accidents are easy to happen. The non-mechanical compaction mode is a layered connection mode, and the composite pipelines are connected layer by layer. The inner liner is mainly connected in a hot melting butt joint mode, namely the end of the pipeline is heated and softened and then extruded together to achieve the connecting effect. However, the connection method also has the problems of low connection strength and protruding annular residues.

Based on the technical background, related scholars propose a method for expanding and connecting thermoplastic pipelines; namely, one end of the pipeline is heated and softened, then the diameter is expanded, then the pipeline to be connected is sleeved, and the heating is continued through an electric heating wire and the like, so that the butt joint of the two sections of pipelines is realized. The connecting mode has high strength, and no convex annular residue exists in the pipe, thereby being beneficial to the pipe cleaning operation of the pipeline. Through research, the following patent technologies are mainly used for expanding the diameter of the pipeline at present.

Patent CN204661780U discloses a pipeline expanding device, which comprises an inner tube, an expanded tube part, a liquid nitrogen supply device, a liquid nitrogen collection device and a pipeline, wherein the liquid nitrogen supply device is connected with one end of the inner tube, the liquid nitrogen collection device is connected with the other end of the inner tube, the expanded tube part is arranged between two ends of the inner tube, the expanded tube part comprises a metal tube, fins and an insulator, the fins are arranged on the metal tube, and the insulator is arranged outside the metal tube between the fins; the inner tube comprises a hose and an insulator, wherein the insulator is arranged outside the hose; the inner pipe is connected with the diameter-expanding part through a joint, the inner pipe is arranged in the pipeline, when the diameter-expanding part is placed at a position needing diameter expansion in the pipeline, the pipeline is filled with water, the liquid nitrogen supply device is started to input liquid nitrogen through one end of the inner pipe, and the liquid nitrogen flows into the liquid nitrogen collecting device through the inner pipe and the diameter-expanding part and the inner pipe. The scheme requires that a construction pipe section is filled with water; liquid nitrogen is required to be conveyed to the diameter expanding part through the inner pipe and conveyed to the outlet of the pipeline for collection through the inner pipe. Therefore, it is difficult to use the solution for pipes that do not have water filling and draining conditions.

Patent CN210919606U discloses a hydraulic system for diameter expansion of a spiral pipe end, which includes a frame, a pair of diameter expansion modules slidably connected to the frame, and a diameter expansion oblique block disposed between the two diameter expansion modules and used in cooperation with the diameter expansion modules, wherein the diameter expansion oblique block is driven by an oil cylinder, the oil cylinder is connected with an oil line pipeline, one end of the oil line pipeline is connected with an oil tank, the oil line pipeline includes a low-pressure large-flow oil line pipeline and a high-pressure small-flow oil line pipeline, and a two-position four-way electromagnetic directional valve and a three-position four-way electromagnetic valve for switching oil flow paths are installed between the low-pressure large-flow oil; an adjustable pressure relay is arranged on the high-pressure small-flow oil way pipeline. According to the technical scheme, two independent hydraulic output units are adopted, different requirements of different working processes on working pressure and moving speed are met according to automatic conversion of required working states, the capacity is saved, the efficiency is improved, the non-working state and the non-pressure output oil pump are in a no-load state, the consumption of electric energy can be reduced, and the loss of the oil pump is reduced. However, the scheme adopts the inclined block as an actuating mechanism, and the expanding stroke is limited; further, the diameter of the pipe cannot be expanded simultaneously in the circumferential direction, and it is difficult to ensure the roundness of the pipe after the diameter expansion.

Patent CN204934380U discloses a pipe end hydraulic cold expanding machine, which includes: the device comprises a hydraulic system, a bracket, an outer tire, an inner tire, a vertical guide block, a support tube, a guide rod and a position sensor. The hydraulic system is arranged on the support, and a piston rod of the hydraulic system is fixedly connected with the rear end of the inner tube. The surface of the inner tube is provided with a plurality of inclined planes distributed around the inner tube, and the inclined planes are provided with T-shaped grooves. The inner side of the outer tire is provided with a T-shaped block matched with the T-shaped groove, and the T-shaped block is matched in the T-shaped groove. The supporting tube is fixed on the bracket, and the vertical guide block is matched with a T-shaped groove at the front end of the supporting tube. The vertical guide block is fixedly connected with the outer tire. The guide rod is connected with the piston rod, and the position sensor is fixed on the support. The scheme adopts an inclined block matched with a T-shaped groove as an actuating mechanism, and the expanding stroke is limited; further, the diameter of the pipe cannot be expanded simultaneously in the circumferential direction, and it is difficult to ensure the roundness of the pipe after the diameter expansion.

Patent CN209903918U discloses a pipeline joint coating heat shrinkable sleeve expanding device, which comprises a base, a bracket, a hydraulic cylinder, a pressure head, a connecting rod, a lifting seat and an expanding die; the base is fixed on the horizontal ground, and an expanding die and a support are fixedly arranged on the base; the main body part of the expanding die is of a cylindrical structure; a cross beam is arranged at the top end of the support, and a hydraulic cylinder is mounted on the cross beam; the hydraulic cylinder is in an inverted state, and a pressure head is arranged at the lower end of a telescopic arm of the hydraulic cylinder; the central axis of the pressure head is coincided with the central axis of the expanding die; the lifting seat is arranged below the pressure head and connected with the pressure head through a connecting rod, the pressure head, the connecting rod and the lifting seat form an integrated frame, and a center hole matched with the outer diameter of the expanding die is formed in the lifting seat. According to the technical scheme, the conical expanding die is plugged into the cross-linked polyethylene pipeline in an axial extrusion mode to expand the pipeline. Due to the structural particularity of the technical scheme, only a short section of pipeline can be subjected to diameter expansion operation; and when the axial resistance of the pipeline to be expanded is overlarge, the pipeline is easy to bend and cannot be sleeved into the conical expanding die.

In terms of pipeline plugging, patent CN111795252A discloses a water injection type water plugging air bag and a method for using the same. The use method of the water injection type water shutoff air bag specifically comprises the following steps: s1, connecting a three-phase power supply, debugging an air compressor, checking the air pressure gauge of the air compressor to normal air pressure, preparing a hydraulic vehicle and an air pump, checking the tightness of an air nozzle and a pipe joint, and connecting a medical oxygen meter air-adding pipe with the air compressor well as an emergency air source; and S2, allowing the diver to enter the water pipeline to perform underwater touch detection, and checking whether sundry burrs exist in the water pipeline. Through water injection in the past gasbag body, increase gasbag body self weight and water to the water pressure of gasbag body lateral wall, increase the frictional force between the gasbag body and the conduit inner wall to improve the ability that bears the water pressure under the high water head effect, and the water injection reduces gasbag internal space in other words, thereby reduces the inflation volume, reaches the effect that reduces the gasbag body focus, increases the stability of the gasbag body.

In the aspect of pipeline plugging, patent CN212004756U discloses a water shutoff air bag for water conservancy detection, which comprises an air bag body, wherein an insert pocket is installed at one side of the air bag body, a support rod is installed at one side of the insert hole, a telescopic rod is installed at one side of the support rod, a connecting plate is installed at one side of the telescopic rod, a supporting plate is installed at the bottom of the telescopic rod, a handle is installed at one side of the connecting plate, an inflation tube is installed at one side of the air bag body, and a fixing plate is installed at one side of the air bag body, which is close to the inflation tube, the utility model discloses an insert pocket, a support rod and a telescopic rod are arranged, the use effect of the water shutoff air bag is improved, the installation efficiency is improved, the problem that the water shutoff air bag is in a soft state and is inconvenient to install in the pipeline is solved, the installation rod, the fixing rod and the, the water plugging air bag can not be connected with other water plugging air bags for use.

In summary, the prior art mainly performs diameter expansion operation on the metal pipeline to eliminate the stress of the welding part; and expanding the diameter of the thermoplastic pipe by adopting a conical die extrusion mode. Related prior art is difficult to adapt to the expanding sleeving construction of the thermoplastic plastic pipe. In the aspect of pipeline plugging, a rubber air bag is usually used for inflating or filling water to plug the pipeline; in the prior art, the air bag has small pressure bearing and is not suitable for the expanding construction requirement of the pipeline. Therefore, the invention provides the diameter expanding method and tool for the thermoplastic plastic pipe, which have practical significance and application prospect, and the related technology has great application value.

Disclosure of Invention

The purpose of the invention is as follows: the expanding tool for the thermoplastic plastic pipe is provided, and the problems that the expanding degree of the existing pipeline expanding technology is small, the roundness of the expanded pipeline is low, the expanding of the end part of the long pipeline is not suitable and the like are solved; the problems that the existing thermoplastic pipeline is low in hot-melt butt joint axial strength and the connection part has protruding annular residues are solved; and simultaneously, the problem of low sealing pressure of the existing pipeline plugging air bag is solved.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows.

The utility model provides a shutoff ball formula pipeline hole enlargement device, includes shutoff ball and casing, its characterized in that: the blocking ball is arranged in the pipeline, the shell is arranged outside the pipeline, and the blocking ball expands after being inflated or filled with water to expand the pipeline.

The shell is integrally cylindrical and comprises a large cylinder and a small cylinder, and a transition section is arranged between the large cylinder and the small cylinder.

The casing is vertically cut into two parts, one side is connected through articulated between the casing two parts, and the another side passes through the screw thread tightening connection.

The resistance wire is arranged outside the shell, and the heat preservation layer is arranged outside the shell.

The inner wall of the large cylinder of the shell is arranged to be conical trumpet-shaped, and the taper range of the trumpet-shaped is 1: 10-1: 40.

The blocking ball comprises an air bag body, an end cover and a pull rope, the air bag body is integrally cylindrical, end sockets are arranged at two ends of the air bag body, and the air bag body is made of elastic rubber; end covers are arranged on the outer sides of the two ends of the air bag body; the stay cable is made of flexible fiber materials and penetrates through the air bag to be connected with the end cover; the end of the air bag body is provided with an interface.

Frameworks are arranged in end sockets at two ends of the air bag body and at the position, close to the end sockets, of the air bag body, and the frameworks are made of flexible fibers; the framework is formed by weaving forward and reverse rotation fiber ropes in a staggered mode.

The invention has the beneficial effects that: (1) the device takes the shell as a die, the shape and size of the thermoplastic pipeline after diameter expansion are controllable, and the diameter expansion can be conveniently carried out according to the installation and design requirements; (2) the pipeline is expanded through the expansion of the plugging balls, the deformation of the pipeline is uniform, and the butt joint of the pipeline is more reliable; (3) after the thermoplastic pipeline is heated and softened, the pipeline can be expanded by inflating or filling water through the air bag, so that the operation is simple and the construction is convenient; (4) the end covers and the inhaul cables are arranged at the two ends of the plugging ball, axial deformation of the air bag body is restrained, and bearing pressure of the air bag body can be greatly improved.

Drawings

FIG. 1 is a schematic diagram of the structure of the plugging ball of the present invention prior to expansion.

Fig. 2 is a schematic view of the expanded structure of the plugging ball of the present invention.

FIG. 3 is a schematic diagram of the framework of the present invention.

FIG. 4 is a schematic diagram of the framework of the present invention.

Fig. 5 is a schematic view of the housing of the present invention.

In the figure: 1. an end cap; 2. a framework; 3. an airbag body; 4. a pipeline; 5. a housing; 6. a resistance wire; 7. a heat-insulating layer; 8. a cable; 9. an interface.

Detailed Description

The present invention is not limited to the following embodiments, and the specific embodiments may be determined according to the technical solution and the practical situation of the present invention. The present invention will be described below with reference to the accompanying drawings. The positional relationship of up, down, left, right, etc. is determined in accordance with the layout direction of fig. 1 in the specification.

A plugging ball type pipeline expanding device comprises a plugging ball and a shell 5, wherein the plugging ball is arranged in a pipeline 4, the shell 5 is arranged outside the pipeline 4, the plugging ball is inflated or filled with water to expand the pipeline 4, and the pipeline 4 is a thermoplastic pipeline.

When the diameter of the thermoplastic pipeline 4 is expanded, a blocking ball is placed in the port of the pipeline 4, and a shell 5 is arranged outside the pipeline 4. The shell 5 is cylindrical as a whole, the shell 5 comprises a large cylinder and a small cylinder, and a transition section is arranged between the large cylinder and the small cylinder and is a conical surface.

The casing 5 is longitudinally divided into two parts, one side of the two parts of the casing 5 is connected through a hinge, and the other side of the two parts of the casing is connected through a screw thread.

And a resistance wire 6 is arranged outside the shell 5, and the shell 5 is heated after being electrified so as to heat the pipeline 4 in the shell 5. The heat preservation layer 7 is arranged on the outer side of the shell 5, so that the high temperature of the shell 5 is prevented from causing scalding to constructors.

In order to facilitate the butt joint of the expanded pipeline 4 and the original pipe diameter pipeline 4, the inner wall of the large cylinder of the shell 5 is in a conical trumpet shape, and the conical degree range of the trumpet shape is 1:10 to 1: 40.

The blocking ball comprises an air bag body 3, an end cover 1, a framework 2 and a guy cable 8. The whole gasbag body 3 is the cylinder and sets up the head at both ends, and gasbag body 3 is for having elastic rubber material. The outer sides of two ends of the air bag body 3 are provided with end covers 1, and the end covers 1 are in contact with end sockets of the air bag. Inhaul cable 8 is the flexible fiber material, and inhaul cable 8 passes the head at 3 both ends of gasbag body, and inhaul cable 8 is connected with the end cover 1 at gasbag both ends. The end of the air bag body 3 is provided with a port 9, and the port 9 is communicated with the inner space of the air bag body 3 and the outer space of the air bag body 3. The air bag body 3 is inflated or filled with water through the interface 9, and the air bag body 3 is expanded to realize plugging or diameter expansion of the pipeline 4.

Frameworks 2 are arranged in end sockets at two ends of the air bag body 3 and at the positions, close to the end sockets, of the air bag body 3, and the frameworks 2 are made of flexible fibers; the framework 2 is made of polyester fibers, glass fibers, aramid fibers, carbon fibers or nylon fibers. The framework 2 is formed by weaving fiber ropes in forward and reverse rotation directions in a staggered mode.

The principle of the invention is as follows: when the diameter of the thermoplastic pipeline 4 is expanded, the plugging ball is placed in the pipeline 4, the shell 5 is installed outside the pipeline 4, the resistance wire 6 on the outer side of the shell 5 heats the shell 5 and softens the pipeline 4, then water or gas is injected from the interface 9 of the airbag body 3, and the airbag body 3 expands and expands the pipeline 4. Under the restraint of the outer shell 5, the pipeline 4 becomes a regular butt joint shape after expanding, so that the pipeline 4 with the original diameter can be conveniently inserted into the pipe.

Claims

1. The utility model provides a shutoff ball formula pipeline hole enlargement device, includes shutoff ball and casing, its characterized in that: the blocking ball is arranged in the pipeline, the shell is arranged outside the pipeline, and the blocking ball expands after being inflated or filled with water to expand the pipeline.

2. The plugging ball type pipeline expanding device according to claim 1, wherein: the shell is integrally cylindrical and comprises a large cylinder and a small cylinder, and a transition section is arranged between the large cylinder and the small cylinder.

3. The plugging ball type pipeline expanding device according to claim 1, wherein: the casing is vertically cut into two parts, one side is connected through articulated between the casing two parts, and the another side passes through the screw thread tightening connection.

4. The plugging ball type pipeline expanding device according to claim 1, wherein: the resistance wire is arranged outside the shell, and the heat preservation layer is arranged outside the shell.

5. The plugging ball type pipeline expanding device according to claim 1, wherein: the inner wall of the large cylinder of the shell is arranged to be conical trumpet-shaped, and the taper range of the trumpet-shaped is 1: 10-1: 40.

6. The plugging ball type pipeline expanding device according to claim 1, wherein: the blocking ball comprises an air bag body, an end cover and a pull rope, the air bag body is integrally cylindrical, end sockets are arranged at two ends of the air bag body, and the air bag body is made of elastic rubber; end covers are arranged on the outer sides of the two ends of the air bag body; the stay cable is made of flexible fiber materials and penetrates through the air bag to be connected with the end cover; the end of the air bag body is provided with an interface.

7. The plugging ball type pipeline expanding device according to claim 6, further comprising a framework, wherein the framework is characterized in that: frameworks are arranged in end sockets at two ends of the air bag body and at the position, close to the end sockets, of the air bag body, and the frameworks are made of flexible fibers; the framework is formed by weaving forward and reverse rotation fiber ropes in a staggered mode.