CN112848250A

CN112848250A - Drum-type thermoplastic pipeline expanding device

Info

Publication number: CN112848250A
Application number: CN202110105724.2A
Authority: CN
Inventors: 何虹钢; 罗绍恒; 李成; 刘轶
Original assignee: Yibin University
Current assignee: Dragon Totem Technology Hefei Co ltd; Shenzhen Dragon Totem Technology Achievement Transformation Co ltd
Priority date: 2021-01-26
Filing date: 2021-01-26
Publication date: 2021-05-28
Anticipated expiration: 2041-01-26
Also published as: CN112848250B

Abstract

The invention relates to a drum-type thermoplastic pipeline expanding device, and belongs to the field of pipeline construction. The technical scheme is as follows: an end cover is arranged at the end part of the rotating shaft, a sliding sleeve is arranged in the middle of the rotating shaft, and the rotating shaft is arranged on the base; one end of the mandrel is hinged to the end cover and can rotate along the radial direction of the end cover; the other end of the mandrel is hinged with a mandril, and the other end of the mandril is hinged on the sliding sleeve; the roller is sleeved on the mandrel, and the roller freely rotates relative to the mandrel; an adjusting mechanism is arranged between the sliding sleeve and the base, and the adjusting mechanism adjusts the axial distance of the sliding sleeve relative to the base. The invention solves the problems of low axial strength and protruding annular residue at the connecting part of the existing hot-melt butt joint of the thermoplastic pipeline; the device does not need other helping hand equipment through manual regulation and construction, the field construction of being convenient for.

Description

Drum-type thermoplastic pipeline expanding device

Technical Field

The invention relates to the field of pipeline construction, in particular to pipeline expanding construction and a device.

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. This type connected mode construction is simple, but hot melt connection position axial strength is lower to pipeline extrusion position leaves convex cyclic annular to remain, has restricted the dredging pipe ware to pass through, causes the pipeline to be difficult to carry out the dredging pipe construction. 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, during the butt joint construction of the pipelines, the large-diameter thin-wall pipelines are difficult to be connected in a hot-melting butt joint mode due to the limitation of the structure of the two-section clamp of the pipelines.

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. The key technology of the connecting method for expanding and butting comprises expanding construction of the thermoplastic 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 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 plastic pipe by adopting a conical die for extruding and expanding. Related prior art is difficult to adapt to the expanding sleeving construction of the thermoplastic plastic pipe. 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 overcomes 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, and simultaneously solves the problems that the hot-melt butt joint of the existing thermoplastic pipeline is low in axial strength and the connection part has protruding annular residues.

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

The utility model provides a drum-type thermoplasticity pipeline hole enlargement device, includes pivot, end cover, sliding sleeve, base, mandrel, ejector pin, cylinder and adjustment mechanism, its characterized in that: an end cover is arranged at the end part of the rotating shaft, a sliding sleeve is arranged in the middle of the rotating shaft, and the rotating shaft is arranged on the base; one end of the mandrel is hinged to the end cover and can rotate along the radial direction of the end cover; the other end of the mandrel is hinged with a mandril, and the other end of the mandril is hinged on the sliding sleeve; the roller is sleeved on the mandrel, and the roller freely rotates relative to the mandrel; an adjusting mechanism is arranged between the sliding sleeve and the base, and the adjusting mechanism adjusts the axial distance of the sliding sleeve relative to the base.

The adjusting mechanism comprises a top ring, a pull rod, a bent rod, a ratchet wheel and a pawl; the top ring is sleeved on the rotating shaft and arranged between the sliding sleeve and the base; one end of the pull rod is hinged to the top ring, and the other end of the pull rod is hinged to the bent rod; the middle part of the bent rod is hinged to the base; the base is provided with a ratchet wheel at the movable position of the bent rod, and the bent rod is provided with a pawl at the corresponding position of the ratchet wheel.

The outer side of the roller is a conical surface, one side of the large end of the roller is close to the end cover, and one side of the small end of the roller is close to the ejector rod; the big end of the conical surface on the outer side of the roller gradually shrinks towards the adjacent end part.

Still include the pinch bar, its characterized in that: the other end of the rotating shaft at the installation end cover is provided with a pry bar, and the pry bar is movably connected with the rotating shaft and is vertical to the rotating shaft.

Still include the base, its characterized in that: the base is fixedly connected with the base, and the base fixes the whole device.

Still include the cutting ferrule, its characterized in that: the clamping sleeve is cylindrical, the clamping sleeve is arranged at two ends of the base, and the clamping sleeve is connected with the rotating shaft through a pin.

At least 3 rollers are arranged in the circumferential direction of the rotating shaft in a central symmetry mode.

The rotating shaft and the sliding sleeve are connected by a spline.

The invention has the beneficial effects that: (1) the device is manually adjusted and constructed, other power-assisted equipment is not needed, and field construction is facilitated; (2) the opening angle of the roller can be adjusted through the matching of the ratchet wheel and the pawl, so that the taper of the bell mouth of the diameter expansion part can be adjusted according to the actual condition of pipeline butt construction; (3) the rollers are in rolling contact with the inner wall of the pipeline, the contact force is small, and the pipeline is not easy to distort and deform in the diameter expanding process; (4) the invention rotates the whole expanding roller through the prying bar, has convenient and labor-saving operation and is beneficial to the field construction operation.

Drawings

Fig. 1 is a schematic view of the roller in a furled state according to the present invention.

Fig. 2 is a schematic view showing the opened state of the drum according to the present invention.

Fig. 3 is a partial cross-sectional view of fig. 2.

In the figure: 1. a pipeline; 2. an end cap; 3. a mandrel; 4. a drum; 5. a rotating shaft; 6. a top rod; 7. a sliding sleeve; 8. a top ring; 9. a pull rod; 10. bending a rod; 11. a card sleeve; 12. a ratchet wheel; 13. a pawl; 14. a base; 15. a pry bar; 16. a base.

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 drum-type thermoplastic pipeline expanding device comprises a rotating shaft 5, an end cover 2, a sliding sleeve 7, a base 14, a mandrel 3, a mandril 6, a drum 4 and an adjusting mechanism. The end part of the rotating shaft 5 is provided with an end cover 2 and fixedly connected. A sliding sleeve 7 is arranged in the middle of the rotating shaft 5, the sliding sleeve 7 is sleeved outside the rotating shaft 5, and the sliding sleeve 7 can axially slide along the rotating shaft 5. The base 14 has an overall cylindrical shape, and the rotary shaft 5 is fitted into a central through hole of the base 14. The mandrel 3 is hinged to the end cover 2 at one end and can rotate along the radial direction of the end cover 2; the other end of the mandrel 3 is hinged with a mandril 6, and the other end of the mandril 6 is hinged with a sliding sleeve 7. The roller 4 is fitted over the spindle 3, the roller 4 being free to rotate relative to the spindle 3. An adjusting mechanism is arranged between the sliding sleeve 7 and the base 14, and the adjusting mechanism adjusts the axial distance of the sliding sleeve 7 relative to the base 14.

The adjusting mechanism comprises a top ring 8, a pull rod 9, a bent rod 10, a ratchet wheel 12 and a pawl 13; the top ring 8 is sleeved on the rotating shaft 5 and is arranged between the sliding sleeve 7 and the base 14; one end of the pull rod 9 is hinged to the top ring 8, and the other end is hinged to the bent rod 10; the bent rod 10 is hinged to the base 14 at a middle portion thereof. The base 14 is provided with a ratchet 12 at the movable position of the bent rod 10, and the bent rod 10 is provided with a pawl 13 at the position corresponding to the ratchet 12; when the bent rod 10 is rotated, the position of the bent rod 10 is fixed through the matching of the pawl 13 and the ratchet 12.

The outer side of the roller 4 is a conical surface, one side of the large end of the roller 4 is close to the end cover 2, and one side of the small end of the roller 4 is close to the ejector rod 6; so that the generatrix on the outside of the roller 4 is flush with the centre line of the pipe 1 after the roller 4 has been opened. In order to more conveniently butt joint the pipeline 1, the original pipe diameter pipeline is inserted into the joint part of the expanded pipeline 1, the opening angle of the mandrel 3 and the roller 4 can be increased, and the expanded pipeline 1 is in a bell mouth shape. On the other hand, in order to gradually transition the diameter-expanded pipeline 1 from the original pipe diameter to a larger diameter, a transition section is arranged on one side of the large end of the conical surface outside the roller 4; the transition section gradually shrinks from the large end of the conical surface at the outer side of the roller 4 to the adjacent end part.

The other end of the rotating shaft 5 at the installation end cover 2 is provided with a round hole, the round hole is used for installing a pry bar 15, and the pry bar 15 is movably connected with the rotating shaft 5 and is vertical to the rotating shaft 5. By rotating the pry bar 15, the rotating shaft 5 is rotated, thereby rotating the drum 4 and the spindle 3.

The base 16 is fixedly connected with the base 14, and the whole device is fixed through the base 16.

The clamping sleeve 11 is arranged at two ends of the base 14, the clamping sleeve 11 is cylindrical, and the clamping sleeve 11 is connected with the rotating shaft 5 through a pin.

The 6 rollers 4 are arranged in the circumferential direction of the rotating shaft 5 in a central symmetry manner, so that a plurality of parts of the pipeline 1 are opened simultaneously, and the deformation coordination of the pipeline 1 is ensured.

The rotating shaft 5 and the sliding sleeve 7 are connected by a spline, so that the torque of the rotating shaft 5 can be transmitted among the mandrel 3, the roller 4 and the ejector rod 6.

The principle of the invention is as follows: after the end parts of thermoplastic pipelines 1 such as polyvinyl chloride pipes, polyethylene pipes, polypropylene pipes, polyformaldehyde pipes and the like are heated and softened, a front-end roller 4 of the device is plugged into the pipeline 1, a bent rod 10 is rotated, and a pull rod 9, a sliding sleeve 7 and an ejector rod 6 drive a mandrel 3 to be outwards expanded. In this way, the roller 4 on the mandrel 3 simultaneously props up a plurality of parts of the pipeline 1, and then the rotating shaft 5 is rotated by the pry bar 15, so that the roller 4 is driven to rotate in the circumferential direction of the pipeline 1, and the diameter of the whole circumference of the pipeline 1 is expanded.

Claims

1. The utility model provides a drum-type thermoplasticity pipeline hole enlargement device, includes pivot, end cover, sliding sleeve, base, mandrel, ejector pin, cylinder and adjustment mechanism, its characterized in that: an end cover is arranged at the end part of the rotating shaft, a sliding sleeve is arranged in the middle of the rotating shaft, and the rotating shaft is arranged on the base; one end of the mandrel is hinged to the end cover and can rotate along the radial direction of the end cover; the other end of the mandrel is hinged with a mandril, and the other end of the mandril is hinged on the sliding sleeve; the roller is sleeved on the mandrel, and the roller freely rotates relative to the mandrel; an adjusting mechanism is arranged between the sliding sleeve and the base, and the adjusting mechanism adjusts the axial distance of the sliding sleeve relative to the base.

2. A roller-type thermoplastic pipe expanding device according to claim 1, wherein: the adjusting mechanism comprises a top ring, a pull rod, a bent rod, a ratchet wheel and a pawl; the top ring is sleeved on the rotating shaft and arranged between the sliding sleeve and the base; one end of the pull rod is hinged to the top ring, and the other end of the pull rod is hinged to the bent rod; the middle part of the bent rod is hinged to the base; the base is provided with a ratchet wheel at the movable position of the bent rod, and the bent rod is provided with a pawl at the corresponding position of the ratchet wheel.

3. A roller-type thermoplastic pipe expanding device according to claim 1, wherein: the outer side of the roller is a conical surface, one side of the large end of the roller is close to the end cover, and one side of the small end of the roller is close to the ejector rod; the big end of the conical surface on the outer side of the roller gradually shrinks towards the adjacent end part.

4. A roller thermoplastic pipe expander as in claim 1 and further comprising a pry bar, wherein: the other end of the rotating shaft at the installation end cover is provided with a pry bar, and the pry bar is movably connected with the rotating shaft and is vertical to the rotating shaft.

5. A roller thermoplastic pipe expander as in claim 1 and further comprising a base, wherein: the base is fixedly connected with the base, and the base fixes the whole device.

6. The roller-type thermoplastic pipeline expanding device of claim 1, further comprising a ferrule, wherein: the clamping sleeve is cylindrical, the clamping sleeve is arranged at two ends of the base, and the clamping sleeve is connected with the rotating shaft through a pin.

7. A roller-type thermoplastic pipe expanding device according to claim 1, wherein: at least 3 rollers are arranged in the circumferential direction of the rotating shaft in a central symmetry mode.

8. A roller-type thermoplastic pipe expanding device according to claim 1, wherein: the rotating shaft and the sliding sleeve are connected by a spline.