CN210291069U - Anti-drop plastic pipe opening of plastic-lined steel pipe and forming device thereof - Google Patents
Anti-drop plastic pipe opening of plastic-lined steel pipe and forming device thereof Download PDFInfo
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- CN210291069U CN210291069U CN201921108148.1U CN201921108148U CN210291069U CN 210291069 U CN210291069 U CN 210291069U CN 201921108148 U CN201921108148 U CN 201921108148U CN 210291069 U CN210291069 U CN 210291069U
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Abstract
An anti-release plastic pipe orifice of a plastic-lined steel pipe is characterized in that a plastic-lined layer (2) is arranged on the inner wall of a steel pipe body (1), a pipe end sleeve (3) is sleeved on the pipe orifice of the plastic-lined steel pipe, the pipe end sleeve (3) comprises a sleeve body (3.1) and a sleeve flange (3.2), and an interface connecting structure (10) is formed between the sleeve body (3.1) and the plastic-lined layer (2); the interface connection structure (10) is realized in such a way that compression-joint textures (11) are arranged on the outer circumferential surface of the sleeve body (3.1), the sleeve body (3.1) enables the plastic lining layer (2) and the compression-joint textures (11) to be in hot-melt compression joint through diameter expansion deformation, the inner wall surface of the plastic lining layer is melted and filled in a space between the compression-joint textures, and a mechanical interlocking reinforced combination area containing the compression-joint textures is formed on the surfaces of the plastic lining layer and the sleeve body; compared with the prior art, the plastic-lined steel pipe anti-release pipe orifice and the forming device thereof are not easy to release plastic at the pipe end, the connection strength of the pipe end is increased, and high pipeline pressure can be achieved for a long time.
Description
Technical Field
The utility model relates to a technical field of steel pipe is moulded to the lining, concretely relates to steel pipe is moulded to lining's anticreep and a indent mouth of pipe and forming device are moulded.
Background
The steel-plastic composite pipe has the advantages of both plastic and steel, ensures the sanitation of the conveyed water quality, and can bear larger conveying pressure, thereby solving the problem of singly adopting a steel pipe or a plastic pipe. At present, the steel-plastic composite pipe becomes a field for rapid development of the pressure pipeline industry.
In the prior art, when groove connection is carried out on a plastic-lined steel pipe in engineering field installation, a special mechanical device is adopted, a groove is processed at a certain position of the end of the plastic-lined steel pipe in a rolling way, and then a rubber sealing ring and a groove joint with a bayonet are used for connecting the plastic-lined steel pipe with the groove. When special mechanical equipment is adopted to roll and process the groove on the plastic-lined steel pipe, the rolling groove pressure wheel is not easy to control the rolling amount each time, if the roller wheel arranged in the rolling groove of the equipment is improperly configured or the rolling groove pressure wheel is excessively large in rolling feeding amount, the lining plastic pipe at the groove processing part of the plastic-lined steel pipe is cut off or damaged by rolling, and the integrity of the lining plastic pipe is damaged, so that the corrosion resistance is lost;
in the use, because long-time practicality, the junction of pipeline is through rivers washing away repeatedly, makes the inside lining mould the condition of taking place partial separation between pipe and the steel pipe easily, leads to pipeline tip part fracture, influences pipeline life.
The design of an anti-plastic-release pipe orifice and a forming device thereof, which are not easy to release plastic at the pipe end and not easy to corrode the pipe end, is a difficult problem which is urgently needed to be solved by the industry.
SUMMERY OF THE UTILITY MODEL
To the above defect, an object of the utility model is to provide a lining plastic steel pipe's anticreep moulds mouth of pipe and forming device thereof.
The utility model aims at realizing the anti-drop plastic pipe mouth of the plastic lined steel pipe, the plastic lined steel pipe is provided with a plastic lined layer for the inner wall of the steel pipe body, a pipe end sleeve is arranged on the pipe mouth sleeve of the plastic lined steel pipe, the material of the pipe end sleeve is rust-proof material, the pipe end sleeve comprises a sleeve body and a sleeve flange, and an interface connection structure is formed between the sleeve body and the plastic lined layer; the interface connection structure is realized in such a way that compression-joint textures are arranged on the outer circumferential surface of the sleeve body, the sleeve body is subjected to diameter expansion deformation to enable the plastic lining layer to be in hot-melt compression joint with the compression-joint textures, the inner wall surface of the plastic lining layer is melted and filled in spaces among the compression-joint textures, and a mechanically interlocked enhanced combination area containing the compression-joint textures is formed on the surfaces of the plastic lining layer and the sleeve body;
the outer surface of the pipe end of the plastic-lined steel pipe is provided with a connecting groove, and the connecting groove is formed by integrally pressing a steel pipe body, a plastic-lined layer and a pipe end sleeve, so that the plastic-lined layer and the pipe end sleeve inwards form a ring convex part at the corresponding part of the connecting groove.
Further, the interfacing structure is alternatively implemented as: the outer circumferential surface of the sleeve body is provided with compression-joint textures, the inner wall surface of the plastic-lined layer is embedded with a fiber fabric layer, the outer surface of the sleeve body is loosely wrapped with a closed ring sleeve of the fiber fabric layer, the fiber fabric layer is flattened through the diameter expansion deformation of the sleeve body and is pressed by the compression-joint textures to be at least partially diffused to the inner wall hot-melting surface of the plastic-lined layer, and the inner wall surface of the plastic-lined layer is melted and filled in the space between the compression-joint textures, so that the plastic-lined layer and the sleeve body surface form a mechanical interlocking reinforced combination area containing the fiber fabric and the compression-joint textures.
Further, the hot melt crimping is: and inserting the sleeve body into the plastic-lined steel pipe, enabling the sleeve flange to abut against the pipe end, heating the pipe end sleeve to a temperature 5-10 ℃ higher than the glass transition temperature Tg of the plastic-lined layer, and simultaneously expanding and deforming the sleeve body so as to enable the inner surface of the plastic-lined layer to be in hot-melt compression joint with the compression joint texture on the outer surface of the sleeve body.
Furthermore, the outer surface of the sleeve body is divided into an inner groove section, a connecting groove section and a pipe end section, and at least the inner groove section is formed with the crimping texture.
Further, the hot-melt pressure welding texture is a plurality of annular convex ribs or rhombic textures with fixed intervals or a plurality of micro-pits with fixed row intervals and column intervals.
The utility model provides a lining plastic steel pipe's mouth of pipe forming device is moulded in anticreep, just be equipped with bloated cover station and indent station side by side to lining plastic steel pipe transfer chain in the frame, the cover mechanism that expands is installed to the cover station that expands, the indent station is fixed with indent mechanism, the cover mechanism that expands includes location structure and the flexible cover mould that expands, location structure includes U type die holder, the flexible cover mould that expands includes the telescopic shaft, snap ring and the cover that expands, the telescopic shaft end fixing has the snap ring, the cover is equipped with the cover that expands between snap ring and the U type die holder left side wall, the telescopic shaft passes the left side wall of U type die holder and stretches out, telescopic cylinder fixes between the both sides wall of U type die holder, telescopic cylinder.
Furthermore, the grooving mechanism comprises a positioning structure and a grooving mold, the grooving mold comprises a grooved shaft and a rolling convex ring, a groove and a pipe end stop are arranged on the outer surface of the grooved shaft, and the outer surfaces of two sides of the groove are provided with pattern surfaces; the rolling convex ring and the axis of the grooved shaft are vertically and rotatably arranged on the liftable rack, and the liftable rack is fixedly connected with the lifting oil cylinder.
Furthermore, the lifting frame comprises a frame body and an inverted U-shaped fork which are integrally connected, the rolling shaft is rotatably arranged on the inverted U-shaped fork, and the rolling convex ring is rotatably fixed on the rolling shaft.
Further, the rolling collar includes a collar and a tube end restraining shoulder, the collar surface being spaced from the tube end restraining surface by a groove depth.
Furthermore, guide rails are arranged on two sides of the frame body, the guide rails can be arranged on the top frame in a vertically sliding mode, the jacking oil cylinder is fixed on the top frame, and the top of the frame body is fixedly connected with a piston of the jacking oil cylinder.
Compared with the prior art, the anti-release plastic pipe orifice of the plastic-lined steel pipe and the forming device thereof are not easy to release plastic at the pipe end, the connection strength of the pipe end is increased, and high pipeline pressure can be achieved for a long time.
Drawings
FIG. 1 is a main sectional view of a first embodiment of an anti-separation plastic pipe orifice of a plastic-lined steel pipe of the present invention;
FIG. 2 is a main sectional view of a second embodiment of an anti-separation plastic pipe orifice of a plastic-lined steel pipe of the present invention;
FIG. 3 is a main sectional view of a pipe end sleeve with annular convex patterns of an anti-drop plastic pipe orifice of a plastic-lined steel pipe of the present invention;
FIG. 4 is a main sectional view of a pipe end sleeve with diamond-shaped convex patterns of an anti-drop plastic pipe orifice of a plastic-lined steel pipe of the present invention;
FIG. 5 is a front view of the expanding mechanism of the forming device for the plastic-lined steel pipe anti-slip pipe orifice of the present invention;
fig. 6 is a partial cross-sectional view of the expanding sleeve mechanism of the molding device for the plastic-lined steel pipe anti-drop pipe orifice of the present invention in a compressed state;
fig. 7 is a partial cross-sectional view of the expanding mechanism of the forming device for the plastic-lined steel pipe anti-slip pipe orifice of the present invention in the pipe expanding state;
fig. 8 is a front view of the grooving mechanism of the anti-dropping plastic pipe orifice forming device for the plastic lined steel pipe of the present invention.
Fig. 9 is a partial sectional view of the grooving mold of the forming device for preventing the plastic-lined steel pipe from dropping off the plastic pipe orifice.
1 steel pipe body, 2 plastic lining layers, 3 pipe end sleeves, 4 connecting grooves, 5 annular convex parts, 6 through grooves and 7 machine frames
10 interface connection structure, 11 crimping texture, 12 fiber fabric layer
20 expanding sleeve mechanism and 30 grooving mechanism
40 expansion sleeve positioning structure, 41 abutting end positioning groove, 42V-shaped support, 43U-shaped die seat, 44 clamping oil cylinder, 45 bottom plate sliding seat,
46 clamping piston
50 telescopic sleeve expansion die, 51 telescopic shaft, 52 snap ring, 53 expansion sleeve and 54 telescopic oil cylinder
60 groove pressing positioning structure, 61 pushing end positioning groove, 62V-shaped support and 63 groove pressing die holder
70 grooving die, 71 grooved shaft, 72 rolling convex ring, 73 lifting frame, 74 rolling shaft, 75 jacking oil cylinder and 76 grooving die frame
7.1 left vertical beam of frame, 7.2 workbench of frame, 7.3 slide rails, 7.4 right vertical beam of machine, 7.5 top frame
3.1 sleeve body, 3.2 sleeve flange, 3.3 flange lower surface
3.11 inner groove section, 3.12 opposite connecting groove section, 3.13 pipe end section
61.1 positioning groove body and 61.2 screw rod
71.1 groove, 71.2 pipe end stop, 71.3 pattern surface, 72.1 convex ring, 72.2 pipe end restraining shoulder, 73.1 frame body and 73.2 inverted U-shaped fork
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings, which are not intended to limit the scope of the invention.
Example one
As shown in fig. 1, the plastic-lined steel pipe is provided with a plastic-lined layer 2 on the inner wall of a steel pipe body 1, a pipe end sleeve 3 is arranged at the pipe orifice of the plastic-lined steel pipe, and the pipe end sleeve 3 comprises a sleeve body 3.1 and a sleeve flange 3.2. An interface connecting structure 10 is formed between the sleeve body 3.1 and the plastic lining layer 2; the interface connection 10 is realized in that a crimp texture 11 is provided on the outer circumferential surface of the sleeve body 3.1. The sleeve body 3.1 of the pipeline sleeve 3 is subjected to diameter expansion deformation so that the plastic lining layer 2 is in hot-melt pressure welding with the compression texture 11.
The material of the pipe end sleeve 3 is preferably rust-proof material, such as stainless steel. The inner hole of the plastic lining layer 2 has a diameter D0Outside diameter D of the sleeve body 3.11Smaller than the inner diameter D of the plastic lining layer 201-3 mm; the sleeve body 3.1 of the pipe end sleeve 3 is inserted into the plastic-lined steel pipe, the sleeve flange 3.2 tightly abuts against the pipe end, the pipe end sleeve 3 is heated to be 5-10 ℃ higher than the glass transition temperature Tg of the plastic-lined layer, and meanwhile, the pipe end sleeve 3 is tightly pressed on the plastic-lined layer 2 through expanding deformation, so that the surface of the plastic-lined layer is tightly combined with the compression texture 11. The lining plastic steel pipe end outer surface is equipped with spread groove 4, spread groove 4 moulds layer 2 and 3 whole indent shaping for steel pipe body 1, lining for the lining moulds layer and pipe end cover inwards forms ring convex part 5 at the corresponding position of spread groove 4.
The crimping texture 11 is a plurality of convex/concave textures with fixed intervals, the convex textures are axial convex straight textures, annular convex ribs and rhombic convex textures, or the concave textures are axial concave straight textures, annular concave grooves and grooves or rhombic concave textures. The outer surface of the sleeve body 3.1 is divided into an inner groove section 3.11, a connecting groove section 3.12 and a pipe end section 3.13, and at least the inner groove section 3.13 is formed with the crimping texture 11. Preferably, for the convenience of processing the crimping texture 11 of the tube end sleeve 3, the whole outer surface of the sleeve body 3.1 is processed with the crimping texture; alternatively, the crimp grain 11 may be located on one or both sides of the annular protrusion 5 due to the spacing effect of the attachment slot 4. That is, the outer surface of the sleeve body 3.1 facing the connecting groove, i.e. facing the connecting groove section 3.12, can be free from a machined crimp texture, and even the outer surface of the sleeve body 3.1 on the side of the annular projection 5 close to the pipe end, i.e. the pipe end section 3.13, can be free from a machined crimp texture.
The flange lower surface 3.3 of sleeve flange 3.2 is equipped with logical groove 6, logical groove 6 extends to on the outer face of cylinder 3.1 to exhaust when convenient bulging.
For the forming of the compression texture, the outer surface of the sleeve body 3.1 is cleaned firstly, a knurling process can be adopted, a knurling tool is adopted for knurling, m0.5 diamond-shaped textures are selected, and the roughness Ra of the outer surface of the sleeve body 3.1 before knurling is less than or equal to 12.5. And (4) processing annular convex-concave spaced textures by adopting a turning tool processing mode. The wall thickness of the sleeve body 3.1 is greater than 2 mm.
When the inner wall of the plastic lining layer is in hot-melt pressure welding with the surface of the sleeve body, the pressure welding textures 11 enable the inner wall of the plastic lining layer to be melted and filled into the space between the pressure welding textures to form firm combination with mechanical interlocking with the surface of the sleeve body, and a reinforcing combination area containing fiber fabrics and textures is formed.
The cylindrical end of the sleeve body 3.1 is provided with an outer pushing and unloading force cone angle α in the wall thickness direction, and the outer pushing and unloading force cone angle α is preferably 30-45 degrees, so that the acting area of the liquid pressure in the direction perpendicular to the wall thickness of the pipe end is reduced, the outer pushing force of the liquid acting between the outer surface of the sleeve body at the pipe end and the plastic lining layer is reduced, and the penetrating force of the liquid entering between the plastic lining layer 2 and the outer surface of the sleeve body 3.1 is reduced.
Example two
The interface connection structure of the anti-plastic-dropping pipe opening is improved, and the rest is the same as the first embodiment.
As shown in the figure, the plastic-lined steel pipe anti-release pipe mouth forms an interface connection structure 10 between a sleeve body 3.1 and a plastic-lined layer 2. The interfacing structure 10 is implemented as: the outer circle surface of the sleeve body 3.1 is provided with compression textures 11, the inner wall surface of the plastic lining layer 2 is embedded with a fiber fabric layer 12, the outer surface of the sleeve body 3.1 is loosely wrapped with a closed ring of the fiber fabric layer 12 and is embedded into the inner wall hot melting surface of the plastic lining layer 2 in a flattening way through the expanding deformation of the pipe end sleeve 3, and meanwhile, the inner wall hot melting surface of the plastic lining layer 2 is further subjected to hot melting compression with the compression textures 11 through the expanding deformation. The fiber fabric layer 12 is a non-woven fabric or a two-dimensional fabric. The fiber material is glass fiber, carbon fiber or aramid fiber. To secure the closed loops of the loosely wrapped fibrous web layer 12, an adhesive may be applied to the surface of the sleeve body. Or the closed loops of the fiber fabric layer 12 are impregnated with an adhesive and then bonded to the cylindrical outer surface of the sleeve body.
In order to increase the combination wettability of the fiber fabric layer and the surface of the plastic lining layer, a coupling agent is sprayed on the surface of the fiber fabric layer. The coupling agent is organic silicon, organic chromium or titanate, etc.
When the inner wall of the plastic lining layer is in hot-melt pressure welding with the surface of the sleeve body, the pressure welding textures 11 enable the inner wall of the plastic lining layer to be melted and filled into the space between the pressure welding textures to form firm combination with mechanical interlocking with the surface of the sleeve body, and a reinforcing combination area containing fiber fabrics and textures is formed.
The molding device for the plastic drop preventing nozzle of the first and second embodiments is as follows:
a molding device for an anti-release pipe orifice of a plastic-lined steel pipe is characterized in that a frame 7 is provided with an expansion sleeve station and a groove pressing station in parallel opposite to a plastic-lined steel pipe conveying line, the expansion sleeve station is provided with an expansion sleeve mechanism 20, the groove pressing station is fixed with a groove pressing mechanism 30, and the expansion sleeve mechanism 20 comprises an expansion sleeve positioning structure 40 and a telescopic expansion sleeve die 50; the expansion sleeve positioning structure 40 comprises an expansion sleeve abutting end positioning groove 41, at least two expansion sleeve V-shaped supports 42 and a U-shaped die holder 43, the abutting end positioning groove 41 is fixed on a left vertical beam 7.1 of the rack, the two V-shaped supports 42 are fixed on a rack workbench 7.2 in a lifting manner, a sliding rail 7.3 is arranged on the rack workbench 7.2, and the U-shaped die holder 43 is in sliding fit with the sliding rail 71.3 through a bottom plate sliding seat 45; and a clamping oil cylinder 44 is horizontally fixed on the right vertical beam 1.4 of the frame, a clamping piston 46 of the clamping oil cylinder 44 is fixedly connected with the left wall of the U-shaped die holder 43, and the clamping piston 46 extends out to drive the U-shaped die holder 43 to move until the left wall of the U-shaped die holder 43 is tightly propped against the end part of the lining plastic steel pipe.
The telescopic sleeve expansion die 50 comprises a telescopic shaft 51, a snap ring 52 and an expansion sleeve 53, wherein the telescopic shaft 51 penetrates through the left side wall of the U-shaped die holder 43 to extend out, the snap ring 52 is fixed at the end part of the telescopic shaft 51, and the snap ring 52 is arranged between the left side wall and the snap ring 52The expansion sleeve 53 is sleeved, the telescopic oil cylinder 54 is fixed between two side walls of the U-shaped die holder 43, and a piston of the telescopic oil cylinder 54 is integrally connected with the telescopic shaft 51. The telescopic shaft 51 is driven by the telescopic oil cylinder 54 to be switched between an extending position and a retracting position, so that the telescopic sleeve expanding die 50 is switched between an inserting positioning state and a die expanding state. In the inserted position, the expansion sleeve 53 has an original outer diameter D0 degree of expansionAnd original length L0(ii) a In the expansion die state, the outer diameter of the expansion sleeve 53 expands to expand the pipe end sleeve 3, the outer surface of the pipe end sleeve 3 is tightly attached to the inner wall of the lining plastic layer 2 and is kept for 3-5 minutes, and the expansion sleeve 53 has an expanded outer diameter DExpansion 1And an expansion length L1. Expanded outer diameter DExpansion 1Equal to the inner diameter D of the plastic-lined layer 20The expansion length satisfies:
The groove pressing mechanism 30 comprises a groove pressing positioning structure 60 and a groove pressing die 70 which are fixed on the rack 10, the groove pressing positioning structure 60 comprises a groove pressing jacking end positioning groove 61, at least two groove pressing V-shaped supports 62 and a groove pressing die holder 63, the groove pressing positioning groove 61 is telescopically fixed on a left vertical beam 7.1 of the rack, the two V-shaped supports 62 are fixed on a rack workbench 7.2 in a liftable mode, and the groove pressing die holder 63 is fixed on the rack workbench 7.2. The positioning groove 61 at the tight end of the top comprises a positioning groove body 61.1 and a screw rod 61.2, the screw rod 61.2 is spirally matched on the left vertical beam 1.1 of the frame, a turntable is arranged at the end part of the screw rod, the turntable can be manually rotated, and the extending position of the screw rod 61.2 is adjusted.
The groove pressing die 70 comprises a grooved shaft 71 and a rolling convex ring 72, a groove 71.1 and a pipe end stop 71.2 are arranged on the outer surface of the grooved shaft 71, and pattern surfaces 71.3 are arranged on the outer surfaces of two sides of the groove 71.1; the rolling convex ring 72 and the axis of the grooved shaft 71 are vertically and rotatably arranged on the liftable rack 73, and the liftable rack 73 is fixedly connected with the jacking oil cylinder 75; the erectable frame 73 comprises a frame body 73.1 and an inverted U-shaped fork 73.2 which are integrally connected, and the rolling shaft 74 is rotatably arranged on the inverted U-shaped fork 73.2; the stitching collars 72 are rotatably secured to stitching shafts 74. Guide plates are arranged on two sides of the frame body 73.1 and can be arranged on the groove pressing die frame 76 in a vertically sliding mode. The top of the frame body 73.1 is fixedly connected with a jacking oil cylinder 75; the rolling collar 72 includes a collar 72.1 and a tube end restraint shoulder 72.2, the collar 72.1 surface being spaced from the tube end restraint surface 72.2 by a groove depth H.
When the device works, the plastic-lined pipe enters the sleeve expanding station, the plastic-lined pipe is supported by the two V-shaped supports 42 of the positioning structure 40, the V-shaped supports 42 are lifted to enable the axis of the plastic-lined pipe to be approximately coaxial with the telescopic shaft 51, the pipe end sleeve 3 is preheated to a temperature 5-10 ℃ higher than the glass transition temperature Tg of the plastic-lined layer, and the pipe end sleeve 3 is sleeved at the end part of the plastic-lined pipe; moving the U-shaped die seat 43, and enabling the telescopic sleeve expansion die 50 to be in an inserting and positioning state, so that the telescopic sleeve expansion die 50 extends into the end of the plastic-lined pipe until the left wall of the U-shaped die seat 43 abuts against the end of the plastic-lined pipe; retracting the telescopic shaft, switching the telescopic sleeve expansion die 50 to the die expansion state and keeping for 3-5 minutes to complete the sleeve expansion process;
and then the plastic-lined pipe is turned forwards into a groove pressing station by a pipe turning mechanism, the plastic-lined pipe is supported by two V-shaped supports 62 of a positioning structure 60, the V-shaped supports 62 are lifted to enable the highest point of an inner hole of the pipe to abut against a pattern surface 71.3 of a grooved shaft 71, a rotating disc is rotated to enable a positioning groove 61 at the tight-pushing end to extend out, the end of the right end of the plastic-lined steel pipe abuts against a stop 71.2, and the positioning structure 60 can ensure that the rotation axis of the plastic-lined pipe is parallel to the grooved shaft 71. The rolling convex ring 72 is slowly moved downwards to abut against the outer surface of the plastic lining pipe; at the moment, a motor is started, the motor rotates the grooved shaft 71, the pattern surface 71.3 of the grooved shaft 71 drives the plastic lining pipe to rotate, the plastic lining pipe rotates to drive the rolling convex ring 72 to rotate, the jacking oil cylinder 74 is started, the jacking oil cylinder 74 drives the rolling convex ring 72 to slowly move downwards until the pipe end restraining convex shoulder 72.2 is pressed on the outer surface of the steel pipe and is kept at the position for more than 1 minute, and the groove pressing depth H of the rolling convex ring 72 is ensured.
In order to solve the problem of "the pipe end anticreep moulds", this application adopts following key technology:
1) the hot-melt compression joint of the plastic lining layer 2 and the surface of the sleeve body 3.1 is strengthened through the interface connecting structure 10
The pipe end sleeve and the plastic lining layer are subjected to hot melt compression joint through expanding deformation in the plastic lining layer of the pipe end, the expanding deformation is only insufficient in compression joint, the hot melt compression joint heated to the glass conversion temperature of the plastic lining layer is also insufficient, and an interface connection structure 10 is further designed to strengthen the connection between the sleeve body and the plastic lining layer. By forming the crimping textures 11 on the surface of the sleeve body, when the inner wall of the plastic lining layer is in hot-melt crimping with the surface of the sleeve body, the crimping textures 11 can at least partially diffuse the fiber fabric layer 12 into the plastic lining layer, and the inner wall of the plastic lining layer is melted and filled into the space between the crimping textures to form firm mechanical interlocking combination with the surface of the sleeve body. The interface connection structure strengthens the connection between the plastic lining layer and the surface of the sleeve body, so that the subsequent integral pressure groove deformation cannot reduce the connection strength between the plastic lining layer and the surface of the sleeve body. Because the thermal expansion coefficients of the plastic-lined layer and the sleeve body are different, the interface connecting structure 80 embedded into the fiber fabric layer 12 of the second embodiment is more superior, and the risk degree of separation of the pipe end sleeve 3 and the plastic-lined layer 2 in the subsequent use process is greatly reduced.
In other words, the interfacing structure 10 includes a crimped texture enhanced bond region; alternatively, the interfacing structure 10 is a reinforced bonding area comprising a layer of fibrous fabric and a crimp texture. The reinforced combination area is a firm combination that the inner wall of the plastic lining layer is melted and filled into the space between the crimping textures to form mechanical interlock with the surface of the sleeve body.
2) The air between the sleeve body and the lining plastic layer is discharged while the sleeve body is expanded
Because the tight effect of support of pipe end, butt between sleeve flange 3.2 and the lining plastic steel pipe end, the air between the layer can only be discharged from the tip surface of sleeve body 3.1 and the crack between the lining plastic layer to the outer cylindrical surface of sleeve body 3.1 and the lining plastic layer, and the exhaust route is long, and the flange lower surface 3.3 of sleeve flange 3.2 is equipped with logical groove 6, on logical groove 6 extended to the outer cylindrical surface of sleeve body 3.1, telescopic shaft 51 was cylinder drive quick retraction during the bulging, and logical groove 6 can discharge the air between sleeve body 3.1 outer cylindrical surface and the lining plastic layer rapidly, can not remain the air between the sleeve body surface that is close to the flange position and the lining plastic layer like this for the hot melt crimping on lining plastic layer 2 and sleeve body 3.1 surface is more firm.
3) Outer thrust taper angle α in wall thickness direction at end of sleeve body
The cylinder end wall thickness direction of the sleeve body 3.1 is provided with an outer push-pull cone angle α, if the plastic lining layer 2 and the surface of the sleeve body 3.1 are used in a pressure pipeline in hot-melt compression joint, the cylinder end of the sleeve body 3.1 is higher than the plastic lining layer by a wall thickness, because the liquid pressure is available in all directions, the pipe end wall thickness is always subjected to the outer push force F of liquid caused by the pressure in the pipe, the outer push force F can enable the liquid to enter the space between the sleeve body 3.1 and the plastic lining layer 2, and then enter the space between the plastic lining layer 2 and the inner wall of the steel pipe body 1 from the lower surface of the sleeve flange, and further corrode the steel pipe, and the outer push-pull cone angle α of 30-45 degrees is designed, so that the acting area of the pipe end in the direction of the vertical wall thickness of the pipe end is reduced, thereby reducing the outer push force of the liquid acting between the outer surface of the sleeve body and.
In conclusion, ① because the interface connection structure 10 strengthens the hot melt compression joint of the plastic lining layer 2 and the surface of the sleeve body 3.1, exhausts air while expanding ②, ③ the external push-out force taper angle α of the sleeve body end wall thickness direction, so that the plastic lining layer 2 and the sleeve body 3.1 are firmly combined into a whole, and can be competent for high pipeline pressure for a long time, the synergistic effect of the three aspects is that the anti-plastic-release pipe orifice has firm combination, and can be tested practically, the anti-plastic-release pipe orifice of the plastic lining steel pipe with phi of 25mm, the flange part of the pipe end sleeve is welded with a traction column, the traction column is connected with a tensile machine, and the pull-out force required by the pipe end sleeve to be pulled away from the steel pipe orifice so that the pipe end sleeve is separated from the plastic.
The anti-release plastic pipe orifice of the plastic-lined steel pipe is difficult to release plastic at the pipe end, increases the connection strength of the pipe end and can be competent for high pipeline fluid pressure for a long time compared with the prior art.
Claims (10)
1. An anti-drop plastic pipe mouth of a plastic-lined steel pipe, which is characterized in that a plastic-lined layer (2) is arranged on the inner wall of a steel pipe body (1),
a pipe end sleeve (3) is sleeved at the pipe orifice of the plastic-lined steel pipe, the pipe end sleeve (3) is made of an antirust material, the pipe end sleeve (3) comprises a sleeve body (3.1) and a sleeve flange (3.2), and an interface connecting structure (10) is formed between the sleeve body (3.1) and the plastic-lined layer (2); the interface connection structure (10) is realized in such a way that compression-joint textures (11) are arranged on the outer circumferential surface of the sleeve body (3.1), the sleeve body (3.1) enables the plastic lining layer (2) and the compression-joint textures (11) to be in hot-melt compression joint through diameter expansion deformation, the inner wall surface of the plastic lining layer is melted and filled in a space between the compression-joint textures, and a mechanical interlocking reinforced combination area containing the compression-joint textures is formed on the surfaces of the plastic lining layer and the sleeve body;
the lining plastic steel pipe end outer surface is equipped with spread groove (4), layer (2) and pipe end cover (3) whole indent shaping are moulded for steel pipe body (1), lining to spread groove (4) for the lining is moulded the layer and the pipe end cover inwards forms ring convex part (5) at the position that corresponds of spread groove (4).
2. The plastic-lined steel pipe drop-resistant nozzle as recited in claim 1, wherein said interfacing structure (10) is alternatively realized as: the fiber fabric layer (12) is embedded in the surface of the inner wall of the plastic lining layer (2), the outer surface of the sleeve body (3.1) is loosely wrapped with a closed ring sleeve of the fiber fabric layer (12), the fiber fabric layer (12) is flattened through the diameter expansion deformation of the sleeve body (3.1) and is pressed by the pressing texture, so that the surface of the inner wall of the molten plastic lining layer is filled in the space between the pressing textures, and the plastic lining layer and the surface of the sleeve body form a mechanical interlocking reinforced bonding area containing the fiber fabric and the pressing texture.
3. The plastic-lined steel pipe anti-drop nozzle of claim 1 or 2, wherein the hot-melt crimping is as follows: the sleeve body (3.1) is inserted into the plastic-lined steel pipe, the sleeve flange (3.2) abuts against the pipe end, the pipe end sleeve (3) is heated to be higher than the glass transition temperature Tg of the plastic-lined layer by 5-10 ℃, and meanwhile, the sleeve body (3.1) expands in diameter and deforms, so that the inner surface of the plastic-lined layer and the crimping texture (11) on the outer surface of the sleeve body are subjected to hot melt crimping.
4. The plastic-lined steel pipe anti-drop nozzle as claimed in claim 3, wherein the outer surface of the sleeve body (3.1) is divided into an inner groove section (3.11), a facing connection groove section (3.12) and a pipe end section (3.13), at least the inner groove section (3.11) being formed with said crimping texture (11).
5. The plastic-lined steel pipe drop-proof nozzle as claimed in claim 3, wherein the crimping texture (11) is a plurality of annular convex ribs with fixed spacing or diamond-shaped texture or a plurality of micro-pits with fixed row spacing and column spacing.
6. A forming device for an anti-drop pipe orifice of a lining plastic steel pipe according to any one of claims 3 to 5, characterized in that an expanding sleeve station and a grooving station are arranged on a frame (7) and opposite to a lining plastic steel pipe conveying line side by side, the expanding sleeve station is provided with an expanding sleeve mechanism (20), the grooving station is fixed with a grooving mechanism (30), the expanding sleeve mechanism (20) comprises an expanding sleeve positioning structure (40) and a telescopic expanding sleeve die (50), the expanding sleeve positioning structure (40) comprises a U-shaped die holder (43), the telescopic expanding sleeve die (50) comprises a telescopic shaft (51), a snap ring (52) and an expanding sleeve (53), the end of the telescopic shaft (51) is fixed with the snap ring (52), the expanding sleeve (53) is sleeved between the snap ring (52) and the left side wall of the U-shaped die holder (43), the telescopic shaft (51) extends out through the left side wall of the U-shaped die holder (43), and a telescopic oil cylinder (54) is fixed between the two, the piston of the telescopic oil cylinder (54) is integrally connected with a telescopic shaft (51).
7. The molding apparatus as defined in claim 6, wherein the grooving mechanism (30) includes a grooving mold (70), the grooving mold (70) includes a grooved shaft (71) and a rolling collar (72), the grooved shaft (71) has a groove (71.1) and a pipe end stop (71.2) on its outer surface, and the groove (71.1) has a pattern surface (71.3) on its outer surface on both sides; the rolling convex ring (72) and the axis of the grooved shaft (71) are vertically and rotatably arranged on the erectable frame (73), and the erectable frame (73) is fixedly connected with the jacking oil cylinder (75).
8. The molding machine as claimed in claim 7, characterized in that the erectable frame (73) comprises an integrally connected frame body (73.1) and an inverted U-shaped fork (73.2), the rolling shaft (74) is rotatably mounted on the inverted U-shaped fork (73.2), and the rolling collar (72) is rotatably fixed on the rolling shaft (74).
9. The forming apparatus according to claim 7, wherein the rolling collar (72) includes a collar (72.1) and a tube end constraining shoulder (72.2), a surface of the collar (72.1) being spaced from the tube end constraining surface (72.2) by a groove depth (H).
10. The molding apparatus as defined in claim 8, wherein the frame body (73.1) has guide rails on both sides, the guide rails are slidably disposed on the top frame (1.5) up and down, the top pressure cylinder (75) is fixed on the top frame (1.5), and the top of the frame body (73.1) is fixedly connected to the piston of the top pressure cylinder (75).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921108148.1U CN210291069U (en) | 2019-07-16 | 2019-07-16 | Anti-drop plastic pipe opening of plastic-lined steel pipe and forming device thereof |
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| CN201921108148.1U CN210291069U (en) | 2019-07-16 | 2019-07-16 | Anti-drop plastic pipe opening of plastic-lined steel pipe and forming device thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110274101A (en) * | 2019-07-16 | 2019-09-24 | 山东君诚创新管业科技有限公司 | A kind of the anticreep modeling nozzle and its molding machine of line plastic-steel tube |
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2019
- 2019-07-16 CN CN201921108148.1U patent/CN210291069U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110274101A (en) * | 2019-07-16 | 2019-09-24 | 山东君诚创新管业科技有限公司 | A kind of the anticreep modeling nozzle and its molding machine of line plastic-steel tube |
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Address after: 256200 Jiaoqiao town Jiaolin Road West, diaosong village north, Zouping County, Binzhou City, Shandong Province Patentee after: Shandong Juncheng Chuangxin PIPE Tech. Co.,Ltd. Address before: 256200 Jiaoqiao town Jiaolin Road West, diaosong village north, Zouping County, Binzhou City, Shandong Province Patentee before: SHANDONG JUNCHENG INNOVATIVE PIPE TECHNOLOGY CO.,LTD. |
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