WO2011110095A1

WO2011110095A1 - Plastic-steel wound pipe elbow and manufacturing method thereof

Info

Publication number: WO2011110095A1
Application number: PCT/CN2011/071670
Authority: WO
Inventors: 郑能欢; 董勉励; 肖日君
Original assignee: 华瀚科技有限公司
Priority date: 2010-03-10
Filing date: 2011-03-10
Publication date: 2011-09-15
Also published as: CN101793338B; CN101793338A

Abstract

A plastic-steel wound pipe elbow (2) and a manufacturing method thereof are disclosed. The elbow (2) comprises two straight plastic-steel wound pipe sections (21, 21'), wherein one end of each straight plastic-steel wound pipe section (21, 21') is a flat connection port, and the other end is an inclined connection port. The plastic pipes (21a) of the two straight pipe sections (21, 21') have equal outer diameters or inner diameters and are connected into a whole by the inclined connection ports. A connection part (22) for being matched with and continuously connected with the plastic pipes (21a) at the inclined connection ports is arranged between the two straight pipe sections (21, 21'), and the connection part (22) comprises an elliptical annular steel band (221), wherein the inner ring side of the elliptical annular steel band (221) is matched with and continuously connected with the plastic pipes (21a) at the inclined connection ports, is attached to a joint (211) and surrounds the joint (211) in the vertical direction. The truncated end of the spirally-wound steel band (21b) of the connecting part (22) truncated by the inclined connection port is connected with the elliptical annular steel band (221). The manufacturing method for the elbow comprises the following steps: preparing materials, setting points, drawing lines, cutting, pre-treating, connecting the steel bands, connecting the plastics and conducting a water-closed test. The invention solves the structural and manufacturing problems of the plastic-steel wound pipe elbow, and enables the plastic-steel wound pipe elbow structure to meet the strength and rigidity requirements.

Description

Plastic steel winding pipe elbow and manufacturing method thereof

[0001] The present invention relates to a pipe elbow structure, and to a method of manufacturing the pipe elbow, and more particularly to a plastic steel wrap pipe elbow and a method of manufacturing the same. Background technique

[0002] Buried drain pipes and buried cable protection pipes for electric power and communication, especially large-diameter buried pipes, because the pipe wall needs to withstand soil pressure, the pipe wall is required to have a high pressure bearing capacity, and the pipe wall must be With a large thickness, in order to ensure that the pipe wall meets the requirements of the buried pressure bearing capacity, at the same time reduce the wall thickness and reduce the pipe manufacturing cost, a plastic steel spiral wound pipe appears. For example, Chinese patent 200520112528. 4, which is filed on July 4, 2005, discloses a plastic steel wound structure 3⁄4 pipe. As shown in Fig. 1, the pipe 1 is composed of a closed smooth fluid passage formed by the inner wall LA, and the outer surface of the pipe wall is a spiral-wrapped steel, and the EifT fefe3⁄4i seedling is 罟4ΒΙ ^ Ϊ7Π3⁄4& Ε3⁄4 1 , _ * Ι 3⁄4^ ^β:.Φ Ι¥ (ΐΤ ή^ ΡΒΐ ^, _士+ 3⁄4 The compressive strength of the 笞 wall and the stiffness of the pipe ring improve the pressure bearing capacity of the pipe body, thus reducing the manufacturing cost of the winding pipe.

[0003] In actual use, according to the requirements of the pipeline arrangement, the arrangement direction of the pipeline is often turned as needed. In the two straight pipelines, the elbow structure needs to be connected. The special rib structure of the wound pipe makes the elbow structure much more complicated than the elbow structure of the ordinary pipe. Due to the large stress concentration at the elbow joint, it is a weak link in the elbow structure. The structure is often due to stress concentration, and the cracking failure first occurs in use. Therefore, how to strengthen the joint structure of the elbow structure, Meet the strength and steel strip requirements, and become an important part of ensuring the reliable operation of the coiled pipe system.

[0004] Due to the complicated structure of the winding pipe elbow and the difficulty in the manufacturing process, the elbow using the wound pipe structure has not appeared so far. Summary of the invention

[0005] One of the technical problems to be solved by the present invention is to provide a plastic steel winding pipe elbow, which solves the shortcoming of the prior art.

^ ^ ^ ι . 3⁄4

[0006] The second technical problem to be solved by the present invention is to provide a method for manufacturing a steel-steel-wound pipe elbow, which solves the problem that the prior art cannot manufacture a wrap-around pipe elbow.

[0007] The technical solution adopted by the present invention to solve one of the technical problems is to construct a steel-steel-wound pipe elbow, which is characterized in that a spiral-wound steel strip is arranged on the outer wall of the plastic pipe, and a flat connection is provided at one end end face. a first straight pipe section of the steel-wound pipe and a second straight pipe section of the plastic-wound pipe of the inclined connection port of the other end end inclined end, the plastic pipe of the first straight pipe section and the plastic pipe of the second straight pipe section have the same outer diameter or the same inner diameter And connected to the whole through the inclined connection port;

[0008] The connecting portion between the first straight pipe segment and the second straight pipe segment includes a plastic connection between the inclined connecting port and the plastic pipe, and the connecting portion includes the inner ring side and the inclined connecting port plastic pipe cooperate with each other continuously The joined seams are attached to the elliptical annular steel strip that is erected around the seam, and the truncated end of the spirally wound steel strip that is cut by the inclined connection end π is connected to the elliptical annular steel strip.

[0009] In the steel-steel-wound pipe elbow of the present invention, the spiral-wound steel strip is disposed on the outer wall of the plastic pipe, and the two ends are respectively respectively The bending section of the inclined connecting port of the connecting portion is included, and the plastic pipe of the bending section is the same as the outer diameter or the inner diameter of the plastic pipe of the first straight pipe section or the plastic pipe of the second straight pipe section.

[0010] In the steel-wound tube elbow of the present invention, the truncated end of the spirally wound steel strip that is cut at the joint by the inclined connection port is directly connected to the elliptical annular steel strip or through the joint member The elliptical annular steel strip is connected.

[001 1] In the steel-wound tube elbow of the present invention, a protective layer attached to the surface of the elliptical annular steel strip is included.

[0012] In the steel-wound tube elbow of the present invention, comprising attaching to the surface of the elliptical annular steel strip and the connecting port

1 ten clothes back 丄 t" 1 surgery ί altar.

[0013] The technical solution adopted by the present invention to solve the technical problem is: providing the plastic steel winding pipe elbow comprises: providing a spirally wound steel strip on the outer wall of the plastic pipe, a flat connecting port with one end end face flush, and the other end end inclined a first straight pipe section of the plastic-wound pipe of the inclined connection port and a second straight pipe section of the plastic-wound pipe, the plastic pipe of the first straight pipe section and the plastic pipe of the second straight pipe section have the same outer diameter or the same inner diameter and are connected by the inclined The port is connected as a whole;

[0014] the first straight pipe section and the first straight pipe section include a connecting portion of the inclined connecting port plastic pipe which is continuously connected with each other, and the connecting portion includes an inner ring side and the inclined connecting port plastic pipe cooperate with each other a continuously connected seam attached to the elliptical annular steel strip erecting the seam, and the truncated end of the spirally wound steel strip cut by the oblique connection port is connected to the elliptical annular steel strip;

[0015] The method comprises the following steps:

[0016] S1: preparing materials: preparing a steel-wound pipe of the required specifications of the steel-wound pipe elbow to be manufactured and a spiral-shaped steel belt formed by spiral winding;

[001 7] S2, find points, draw lines, cut:

"ηπ. Ί iB m SF^^iS 一古1⁄2H RA /HS 4ϊ:Ι π JKfe Δ: ; * 1* i1⁄4 T田士Ft * Sfe 士 H Intersection of the highest point Tl and the lowest point tl, at the highest A point is taken between the point T1 and the lowest point t1, and the coordinates of each point on the outer wall of the inclined pipe of the first straight pipe section are determined according to the projection relationship, according to the maximum length of the first straight pipe section. Point T1 is a base point to determine a straight port position of the first straight pipe section; according to the theoretical intersection line of the connecting portion of the second straight pipe section plastic pipe inclined port, the highest point T2 and the lowest point t2 of the intersecting intersection are determined, And taking a point between the highest point T2 and the lowest point t2, determining coordinates of each point on the outer wall of the inclined pipe of the first straight pipe section according to the projection relationship, according to the most straight line of the second straight pipe section Determining a position of the straight port of the second straight pipe segment based on the highest point T2; and slanting the outer wall of the plastic pipe of the first straight pipe segment and the outer pipe of the second straight pipe segment according to the determined coordinates Find a point, smooth the connection points Said first tube segment has an outer wall of the plastic hose port intersecting oblique line and the second straight pipe section of plastic pipe is inclined outer wall intersecting line ports;

[0019] along the first straight pipe section plastic pipe inclined port outer wall intersecting line and the second straight pipe section plastic pipe inclined end

The outer wall intersecting line, respectively cutting the first straight pipe section plastic pipe and its truncated wound steel strip, the second straight pipe section plastic pipe and the truncated wound steel strip, cutting the first straight pipe section and the second a flat port of a straight pipe section;

[0020] The first straight pipe section plastic pipe inclined port outer 3⁄4 intersecting line is matched with the connecting line and the corresponding matching inclined port outer wall, and the second straight pipe section plastic pipe is inclined to the outer wall of the port After the connecting portion is matched with the intersecting line of the corresponding matching inclined port outer wall, the splicing section of the elliptical annular steel strip is spliced from the circular arc-shaped steel strip and the radius of curvature of the inner ring of the splicing section is correspondingly performed Correction, so that the splicing segment meets the corresponding radius of curvature requirements;

[0021] S3, pre-processing: a connection portion to an end portion of the splicing segment, a connection portion of the end portion of the wound steel strip to be cut, and a corresponding portion of the end portion of the wound steel strip to be cut and the splicing portion Pre-treatment of the connection site before connection;

[0022] S4, steel belt connection: splicing the joint portion of the splicing section around the connecting portion into the elliptical ring steel a belt, the end portion of the wound steel strip being cut off is respectively connected to the elliptical annular steel strip;

[0023] S5, plastic connection: a continuous closed plastic connection to the joint of the connecting portion;

[0024] S6, water shutoff test: the water tight test of the plastic steel wound pipe elbow that completes the plastic connection.

[0025] In the manufacturing method of the steel-wound pipe elbow of the present invention, the steel-wound pipe elbow includes a spirally wound steel strip disposed on the outer wall of the plastic pipe, and the two ends respectively include a fold at the inclined connection port of the connecting portion. a curved section, the plastic tube of the bending section is the same as the outer diameter or the inner diameter of the plastic tube of the first straight section or the plastic tube of the second straight section;

[0026] The step S2 includes determining, according to the theoretical intersection line of the connecting portion, the highest point and the lowest point of the intersecting ends of the connecting portion according to the outer wall of the inclined connecting port at both ends of the bending section, and according to the bending The maximum length of the segment determines the distance between the two highest points of the two theoretical intersection lines, and the distance between the highest point and the lowest point of the theoretical intersection line of the inclined outer wall of the inclined connection port at both ends of the bending section is taken according to The projection relationship determines the coordinates of each point on the outer wall of the inclined ports of the plastic tube of the bending section; according to the determined coordinates, a point is found on the outer wall of the inclined port of the plastic tube at both ends of the bending section, and the points are smoothly connected The intersecting line of the outer wall of the inclined port of the plastic pipe at both ends of the bending section;

[0027] along the curved section of the plastic pipe at both ends of the inclined end U outer wall intersecting line, respectively cutting the bending section of the plastic pipe and its truncated wound steel strip;

[0028] when the bending section is two or more, the inclined line of the outer wall of the inclined port of the plastic pipe of the bending section is correspondingly matched with the tilting port of the plastic pipe of the bending section at the connecting portion After the intersecting lines of the outer wall are matched, the splicing section of the elliptical annular steel strip is spliced from the circular arc-shaped steel strip and the radius of curvature of the inner ring of the splicing section is correspondingly corrected, so that the splicing section satisfies the corresponding radius of curvature requirement;

[0029] The step S3 includes pre-processing the connection portion of the end portion of the bent steel strip to be cut off.

[0030] In the manufacturing method of the plastic-steel-wound pipe elbow of the present invention, the steel-wound pipe elbow includes a truncated end of the spirally wound steel strip whose connection portion is cut by the oblique connection port, and the ellipse I a ring-shaped steel strip is connected to the elliptical annular steel strip through a connecting member;

[0031] the step S4 includes: after the elliptical annular steel strip is fabricated, according to the distance between the truncated end of the truncated wound steel strip and the adjacent side surface of the elliptical annular steel strip Separating the connected ends of the truncated end of the truncated wound steel strip from the elliptical annular steel strip from the arc-shaped steel strip; pretreating the connecting surface of the connecting member The connecting members are respectively connected to the cut ends of the corresponding truncated wound steel strips and the corresponding connecting portions of the splice segments.

[0032] In the method of manufacturing the steel-wound tube elbow of the invention of the invention, after the step S4, the step SA is included: the molten plastic covers the spliced section and the bare metal surface of the wound steel strip.

[0033] In the manufacturing method of the steel-wound tube elbow of the present invention, after the step S4, the method includes the step SA: the molten plastic covers the bare metal of the splicing section, the wound steel strip and the connecting member surface.

[0034] The steel-wrapped tube elbow of the present invention and the manufacturing method thereof are compared, and the prior art has the beneficial effects of:

[0035] 1. By arranging the elliptical annular steel strip at the joint of the elbow, the structural weak link of the elbow of the plastic-wrapped tube--the strength and rigidity of the elbow joint is enhanced, and the elbow structure of the steel-wound tube is satisfied. Strength and stiffness requirements;

[0036] 2. Solving the problem of manufacturing a steel-wound pipe elbow, according to the manufacturing method of the steel-wound pipe elbow of the present invention, a steel-wound pipe elbow that satisfies the requirements of strength and rigidity can be manufactured. DRAWINGS

[0037] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:

1 is a structural perspective view of a conventional plastic steel wound pipe.

2 is a perspective view of an embodiment of a plastic steel wound pipe elbow of the present invention.

3 is a perspective view showing the connection structure of the straight pipe section and the elbow section of the elbow of the plastic steel winding pipe of the present invention.

4 is a cross-sectional view showing an embodiment of a steel-wound tube elbow of the present invention.

5 is an enlarged view of a portion Z in FIG. 4.

6 is a graph showing the sampling point of the elbow of the plastic-wrapped tube in the manufacturing method of the plastic-steel-wound pipe bend of the present invention. detailed description

[0044] Plastic steel winding pipe elbow embodiment 1

As shown in FIG. 2, FIG. 3, FIG. 4, and FIG. 5, the steel-wrapped tube elbow 2 of the present embodiment includes two straight sections 21, 21' of plastic-steel-wound tubes and a bent section 23 of a plastic-steel-wound tube.

[0046] The straight section of the plastic steel winding pipe 21, 21 ' is provided with a spirally wound steel strip 21b on the outer wall of the plastic pipe 21a, one end is the end

Γ ^: The straight connection port of the Qi, and the other end is the inclined connection port with the end inclination.

[0047] In the present embodiment, the straight pipe sections of the two pieces of plastic steel winding pipe of the elbow are made of the same steel-wound pipe. In other embodiments, the straight pipe sections of the two-piece steel-wound pipe of the elbow are made of a plastic-steel wrap tube having the same outer diameter or the same inner diameter of the plastic pipe, and the object of the present invention can also be achieved.

[0048] The steel-wound pipe bending section 23 is provided with a spirally wound steel strip 23b on the outer wall of the plastic pipe 23a, and the two ends are inclined connection ports which are inclined at the ends.

[0049] In the present embodiment, the bent section 23 of the plastic-steel-wound tube of the elbow is made of a plastic-wound tube which is identical to the straight section 21 of the steel-wound tube. In other embodiments, the bending section of the plastic-steel-wound tube of the elbow can be made by using a plastic tube and a plastic-wound tube having the same outer diameter or the same inner diameter of the plastic tube of the plastic tube wound straight tube section, and the invention can also be realized.

[0050] The straight section 21, 21' of the steel-wound pipe is connected to the bent section 23 of the steel-wound pipe through the joint portion 22. In the connecting portion 22, the plastic pipe of the straight pipe section 21, 21' of the steel-wound pipe is continuously connected with the plastic pipe of the bending section 23 of the steel-wound pipe at its inclined connection port, and the connecting portion 22 further comprises an elliptical ring. The steel strip 221, the elliptical annular steel strip 221 is erected around the straight section 21, 21' of the plastic pipe, and the plastic pipe inclined connection port of the plastic-wound pipe bending section 23 cooperates with the continuously connected joint 211, and The inner ring side of the elliptical annular steel strip 221 is attached to the seam.

[0051] At the joint portion 22, the end portion of the slanted connection port of the straight pipe section 21, 21' of the steel-wound pipe is cut and the end of the wound steel strip 2 lb is connected to the elliptical annular steel strip 221, and the inclination of the bent section 23 of the plastic-steel-wound tube The side surface of the end elliptical annular steel strip 221 of the wound steel strip 23b whose connection port is cut off is connected. In the present embodiment, as shown in Fig. 3, the end of the truncated wound steel strip 21b and the end of the truncated wound steel strip 23b are joined to the side surface of the elliptical annular steel strip 221 by a joint member 222. In other embodiments, the wound steel strips 21b, 23b are cut along the inclined end turns plane, the ends of the truncated wound steel strips 21b, the ends of the truncated wound steel strips 23b may be directly opposite the sides of the elliptical annular steel strips 221. Table ΐ] connection.

[0052] As shown in FIG. 4, the angle α between the axes of the straight sections 21, 21 of the two steel-wound tubes is the corner of the steel-wound tube elbow 2. [0053] In other embodiments, one, two, three or more plastic-wound tube bend sections 23 may be employed depending on the different radius of curvature P of the plastic-wrapped tube elbow 2. The more the number of bending sections 23 of the steel-wound tube in the elbow, the smaller the radius of curvature of the elbow.

[0054] When two or more bent sections 23 are used in the steel-wound tube elbow 2, the adjacent two bent sections 23 are also connected by the structure of the above-mentioned connecting portion 22, at the connecting portion 22, the adjacent two The inclined connecting ports of the bent sections 23 cooperate with each other to be continuously connected.

[0055] In the above embodiments, the "connection" between the structures may employ a suitable connection including but not limited to welding or bonding.

[0056] In the above embodiment, the connecting member 222 may have a plate-like structure or a block structure.

[0057] In the above embodiment, a protective layer, such as an anticorrosive paint protective layer or a plastic protective layer, is provided on the surface of the connecting member 222, the elliptical annular steel strip 221, and the wound steel strips 21b, 23b to improve the connecting member 222 and the elliptical ring. Steel strip 221, corrosion resistance. The protective layer can completely cover or partially cover the bare metal watch of the connecting piece and the elliptical annular steel strip.

[0058] Plastic steel winding pipe bending 3⁄4 embodiment 2

[0059] The steel-wrapped tube elbow 2 of the present embodiment comprises two straight sections 21, 21 ' of plastic-wrapped steel pipe, and the straight-line section 21, 21' of the steel-wound pipe is provided with a spirally wound steel strip 21b on the outer wall of the plastic pipe 21a, one end of which is The flat end of the straight connection port, the other end is the inclined connection port with the end face inclined.

[0060] The straight pipe sections of the two-piece steel-wound pipe of the elbow can be made of the same steel-wound pipe, or can be made of a plastic-wound pipe having the same outer diameter or the same inner diameter of the plastic pipe, and the object of the present invention can be achieved.

[0061] The two steel-steel-wound straight pipe sections 21, 21' are connected by a joint portion 22. In the connecting portion 22, the inclined connecting ports of the two straight sections 21, 21' of the plastic steel winding pipe are continuously connected with each other, and the connecting portion 22 further comprises an elliptical annular steel strip 221, and the elliptical annular steel strip 221 is erected to surround the straight pipe section of the two plastic steel winding tubes. The plastic tube inclined connection ports of 21, 21' cooperate with the continuously connected joint 2i i, and the inner ring side of the elliptical annular steel belt 221 is attached to the joint.

[0062] At the joint portion 22, the slanted connection ports of the straight sections 21, 21' of the two steel-wound tubes are cut off by the strip

The end of 21b is connected to the elliptical annular steel strip 221 . The end of the truncated wound steel strip 21b may be joined to the side surface of the elliptical annular steel strip 221 by a connecting member 222, or the steel strip 21b may be cut along the inclined port plane to end the end of the truncated wound steel strip 21b. Directly connected to the side surface of the elliptical annular steel strip 221 .

[0063] A method of manufacturing the steel-wound tube elbow of the present invention comprises the following steps:

[0064] Preparation step: preparing the steel-wound tube of the required specification of the steel-wound tube elbow to be manufactured and spirally winding to form a circular-shaped steel strip.

[0065] Find points, draw lines, and cut steps:

[0066] As shown in FIG. 4 and FIG. 6, according to the straight pipe section 21 of the two straight pipe sections, the outer wall of the inclined pipe of the plastic pipe determines the highest point T1 and the lowest point of the intersecting intersection of the connecting portion and the bending section 23. Tl, taking a point between the highest point T1 and the lowest point t1, determining the coordinates of each point on the outer wall of the inclined pipe of the plastic pipe of the straight pipe section 21 according to the projection relationship, and determining the maximum length T1 of the straight pipe section 21 as the base point of the highest point T1 The straight port position of the straight pipe section 21.

[0067] According to the straight pipe section 2 of the two straight pipe sections, the outer wall of the inclined pipe of the plastic pipe is determined at the highest point T2 3⁄4 of the intersecting point of the joint intersection of the connecting section and the bending section 23, the lowest point t2, at the lowest point of the highest point T2 3⁄4 The interval between t2 is taken. According to the projection relationship, the coordinates of each point on the outer wall of the inclined pipe of the straight pipe section 2 are determined. According to the maximum length L21 of the straight pipe section 21', the straight point of the straight pipe section is determined as the base point. End position.

[0068] according to the determined coordinates on the outer wall of the inclined pipe of the straight pipe section 21 and the straight pipe section 2Γ plastic pipe Find the point on the outer wall of the port, and smoothly connect the points to the intersecting line of the outer wall of the inclined pipe of the straight pipe section 21 and the straight section of the straight pipe section 21' plastic pipe inclined end U.

[0069] According to the bending point 23, the outer wall of the connecting port is respectively connected to the highest point T1, Τ2 and the lowest point t1, t2 of the theoretical intersecting line of the connecting portion, and at the same time, according to the most human length L23 of the bending section 23, two theories are determined. The distance between the two highest points T1 and Τ2 of the intersecting line is between the highest point T1 and the lowest point t1 of the theoretical intersecting line of the outer wall of the curved connecting section 23, and between the highest point T2 and the lowest point t2. According to the projection relationship, the coordinates of each point on the outer wall of the two inclined ports of the plastic tube of the bending section are determined according to the projection relationship; according to the determined coordinates, a point is found on the outer wall of the inclined port of the plastic tube at both ends of the bending section 23, and the joint is connected by the nail slip. Obtaining the intersecting line of the outer wall of the inclined port of the plastic pipe at both ends of the bending section 23.

[0070] along the straight pipe section 21 plastic pipe inclined port outer wall intersecting line and straight pipe section 2 plastic pipe inclined port outer wall intersecting line, respectively cut straight pipe section 21 plastic pipe 21a and its truncated wound steel strip 21b, straight pipe section 2 plastic The tube 21a and its truncated wound steel strip 21b cut the flat end portion 21 of the straight tube section 21 and the straight tube section 2. Along the bending section 23, the two ends of the plastic tube are inclined to intersect the outer wall of the port, and respectively cut the plastic pipe 23a of the bending section and the twisted steel strip '23b.

[0071] In the present embodiment, the wound steel strip 21b with the straight pipe section inclined port being cut and the wound steel strip 23b with the bent section inclined port being cut off are further cut off at the flat cutting position of the port along the inclined port of the plastic pipe, The splicing of the plastic pipe of the inclined port and the splicing installation of the elliptical annular steel strip can be facilitated. At this time, the cut ends of the wound steel strips 21b, 23b need to be connected to the elliptical annular steel strip 221 through the connecting member 222.

[0072] In other embodiments, the straight steel pipe inclined port is cut off by the wound steel strip 21b and the bent section inclined port is cut off. The wound steel strip 23b can be cut along the port plane of the plastic pipe inclined port, at this time, the steel is wound. The truncated end of the belt can be directly connected to the elliptical annular steel strip of the joint.

[0073] The intersecting line of the outer wall of the inclined pipe of the straight pipe section 21 is connected to the outer wall of the inclined pipe of the plastic pipe of the bending section 23, and then the straight pipe section 21' plastic pipe inclined port outer wall intersecting line After the connecting portion is matched with the intersecting line of the outer wall of the inclined end U of the plastic pipe of the bending section 23, the splicing section of the spliced elliptical annular steel strip 221 is cut out from the circular arc-shaped steel strip and the radius of curvature of the inner ring of the splicing section is correspondingly corrected. Make the splicing segment meet the corresponding radius of curvature requirements.

[0074] a pre-treatment step: pre-treating the connection portion of the end portion of the splicing section, the joint portion of the end portion of the wound steel strip at the cut end portion, and the end portion of the entangled steel strip at the cut end portion and the corresponding joint portion of the splicing section, The connecting portion of the bent steel strip is cut at the end of the cut portion, and the pre-treatment is performed before the connection, including grinding the burr to make the joint portion flat. When the joint portion has a protective layer (anti-corrosion paint or plastic layer, etc.), the protective layer is removed to expose the metal width. 5 to 10 mm for easy connection.

[0075] The steel strip joining step: splicing the joining seam of the splicing section around the connecting portion 22 into an elliptical annular steel strip 221 .

[0076] according to the distance between the truncated end of the truncated wound steel strip 2ib, 23b and the side surface of the adjacent elliptical annular steel strip 221, respectively, the cut-off wound steel is cut from the circular arc-shaped steel strip A connector 222 of the truncated end of the belt and the elliptical annular steel strip. The joining surfaces of the connecting members 222 are pretreated, and the connecting members 222 are respectively connected to the cut ends of the corresponding truncated wound steel strips and the corresponding joint portions of the splice segments.

[0077] Plastic connecting step: a continuously sealed plastic connection to the joint of the connecting portion, which can be welded and welded by squeezing the welding strip, as shown in the plastic weld 25 of FIG.

[0078] Closed water test step: The water-tight test is carried out on the elbow of the plastic-steel-wound tube which completes the plastic connection to ensure that there is no leakage, and if there is leakage, repair is performed.

[0079] In the above method, after the steel strip joining step, a protective step may be included: the molten plastic covers the sealing splicing section, the steel strip and the bare metal surface of the connecting member.

[0080] In other embodiments, when the manufactured steel-wound tube elbow adopts more than two bend segments 23, two adjacent The manufacturing method of the joint portion of the mutually inclined inclined ends π of the bent sections is the same as above.

[0081] In other embodiments, when the manufactured steel-wound tube elbow is directly mated with the inclined ports of the two straight pipe sections, the joint structure is manufactured as above.

[0082] In the connection portion of the steel-wound tube bend, the inclination angles of the inclined ports of the respective connection portions may be different, and the sizes of the elliptical annular steel strips may be different, but the two inclined ports of one connection portion shall be mutually sealed and continuously sealed. Connected, the corresponding elliptical annular steel strip shall be erected around the connecting portion of the plastic tube inclined connecting port to cooperate with the continuous joint, and the inner ring side of the elliptical annular steel strip is attached to the joint.

Claims

Claim

A plastic-steel-wound tube elbow, which comprises a spiral-wound steel strip on the outer wall of the plastic tube, a flat connection port with one end face flush, and a plastic-wound tube with a tilted connection port at one end end of the 3⁄4 end. a second straight pipe section of the pipe section and the plastic steel winding pipe, wherein the plastic pipe of the first straight pipe section and the plastic pipe of the second straight pipe section have the same outer diameter or the same inner diameter and are connected as a whole through the inclined connecting port;

A connecting portion between the first straight pipe segment and the second straight pipe segment includes a plastic connection between the inclined connecting port and the plastic pipe. The connecting portion includes a continuous connection between the inner ring side and the inclined connecting port plastic pipe. An elliptical annular steel strip is attached and erected around the seam, and the truncated end of the spirally wound steel strip which is cut by the oblique connection port is connected to the elliptical annular steel strip.

2. The steel-wrapped tube elbow according to claim 1, comprising: a spirally wound steel strip disposed on an outer wall of the plastic tube; and a bent portion at each of the two ends respectively including a slanted connection port at the connecting portion, the fold The plastic pipe of the curved section is the same as the outer diameter or the inner diameter of the plastic pipe of the first straight pipe section or the plastic pipe of the second straight pipe section.

The steel-wound pipe elbow according to claim 1 or 2, wherein the cut end of the spirally wound steel strip which is cut by the inclined connection port is directly connected to the elliptical annular steel strip Connected or connected to the elliptical annular steel strip by a connector.

4. A steel-wound tube elbow according to claim 1 or 2, characterized in that it comprises a protective layer attached to the surface of said elliptical annular steel strip.

5. The steel-wound tube elbow according to claim 3, comprising a protective layer attached to the surface of the elliptical annular steel strip and to the surface of the connector.

A manufacturing method of a steel-steel-wound pipe elbow, characterized in that the plastic-steel-wound pipe elbow comprises a spirally wound steel strip on the outer wall of the plastic pipe, a flat connection port with one end face flush, and an inclined inclination of the other end face. a first straight pipe section of the plastic-steel winding pipe of the connection port and a first straight pipe section of the plastic-steel winding pipe, the plastic pipe of the first straight pipe section and the plastic pipe of the first straight pipe section have the same outer diameter or the same inner diameter and are connected via the inclined connection end Connection as - overall;

Between the second straight pipe sections of the first straight pipe section, a connecting portion of the inclined connecting port plastic pipes is continuously connected with each other, and the connecting portion comprises a seam of the inner ring side and the inclined connecting port plastic pipe which are continuously connected with each other. An elliptical annular steel strip attached and erected around the seam, and the truncated end of the spirally wound steel strip cut by the inclined connection end U is connected to the elliptical annular steel strip;

The method includes the following steps:

S1. Preparation: Prepare the steel-wound tube of the required specification of the plastic-wrapped tube elbow to be manufactured and spirally wrap to form a circular arc-shaped steel strip;

S2, find points, draw lines, cut:

Determining a highest point T1 and a lowest point t1 of the intersecting intersection according to a theoretical intersection line of the connecting portion at the outer wall of the inclined pipe of the first straight pipe section, and spacing between the highest point T1 and the lowest point t1 Taking a point, determining coordinates of each point on the outer wall of the inclined pipe of the first straight pipe section according to the projection relationship, and determining the first straight pipe section according to the maximum length of the first straight pipe section by using the highest point T1 as a base point a straight port position; determining a highest point T2 and a lowest point t2 of the intersecting intersection according to the theoretical intersecting line of the connecting portion according to the first straight pipe segment plastic pipe inclined port outer wall, at the highest point T2 and the lowest point The point between the points t2 is taken as a point, and the coordinates of the points on the outer wall of the inclined pipe of the second straight pipe section are determined according to the projection relationship, and the maximum length of the second straight pipe section is determined according to the highest point T2. The first straight pipe section has a straight port position; according to the determined coordinates, the outer wall of the first straight pipe section plastic pipe inclined port and the second straight pipe section plastic pipe are inclined to the outer wall of the port, find a point, and smoothly connect the points Get the stated Plastic pipe has tube An intersecting line of the outer wall of the inclined port and an outer wall of the inclined port of the first straight pipe section;

Along the first straight pipe section plastic pipe inclined port outer wall intersecting line and the second straight pipe section plastic pipe inclined port outer wall intersecting line, respectively cutting the first straight pipe section plastic pipe and its cut wound steel strip, The second straight pipe section plastic pipe and its cut wound steel strip cut the flat port of the first straight pipe section and the second straight pipe section;

The first straight pipe section plastic pipe inclined end Π outer wall intersecting line is matched with the corresponding matching inclined end Π outer wall intersecting line, and the second straight pipe section plastic pipe inclined port outer wall is intersected After the connecting portion cooperates with the intersecting line of the corresponding matching inclined port outer wall, the splicing section of the elliptical annular steel strip is spliced from the circular arc-shaped steel strip and the radius of curvature of the inner ring of the splicing section is correspondingly shaped. , so that the splicing segment meets the corresponding radius of curvature requirements;

53. Pretreatment: a joint portion of the end portion of the splice section, a joint portion of the end portion of the wound steel strip to be cut, and a corresponding joint portion of the end portion of the wound steel strip to be cut and the splice section Pre-treatment before connection;

54. Steel strip connection: splicing the connecting seam around the connecting portion into the elliptical annular steel strip, and connecting the end portions of the wound steel strip to the elliptical annular steel strip respectively ;

55. Plastic connection: continuously sealing the plastic connection to the joint of the connecting portion;

56. Water-tight test: The water-tight test is carried out on the elbow of the plastic-steel-wound pipe which completes the plastic connection.

The manufacturing method of the steel-wound pipe elbow according to claim 6, wherein the steel-wound pipe elbow comprises a spirally wound steel strip on the outer wall of the plastic pipe, and the two ends respectively include the connecting portion. Tilting the bending section of the connecting port, the plastic tube of the bending section is opposite to the outer diameter of the plastic tube of the first straight section or the outer diameter of the plastic tube of the second straight section

The step S2 includes determining, according to the theoretical intersection line of the connecting portion, the highest point and the lowest point of the intersecting ends of the connecting portion according to the outer wall of the inclined connecting port at both ends of the bending section, and according to the maximum ϋ of the bending section. Determining the distance between the two highest points of the two theoretical intersection lines, and taking a point between the highest point and the lowest point of the theoretical intersection line of the inclined outer wall of the inclined connection port at both ends of the bending section, according to the projection relationship The coordinates of each point on the outer wall of the two inclined ports of the plastic pipe of the bending section; according to the determined coordinates, find a point on the outer wall of the inclined port of the plastic pipe at both ends of the bending section, and smoothly connect the points to obtain the bending section The outer ends of the inclined ports of the plastic pipe are intersecting lines;

Along the two ends of the plastic pipe of the bending section, the intersecting lines of the outer wall of the port are inclined, and the plastic pipe of the bent section and the wound steel strip of the cut section are respectively cut;

When the bending section is two or more, the intersecting line of the outer wall of the inclined port of the plastic pipe of the bending section is intersected with the outer wall of the inclined port of the plastic pipe corresponding to the bending section at the connecting portion After the line is matched, the splicing section of the elliptical annular steel strip is spliced from the circular arc-shaped steel strip and the radius of curvature of the inner ring of the splicing section is correspondingly adjusted, so that the splicing section satisfies the corresponding ffl rate radius requirement;

The step S3 includes pre-joining the connection portion of the end portion of the bent steel strip to which the steel strip is cut.

The method of manufacturing a steel-wound tube elbow according to claim 6, wherein the steel-wound tube elbow comprises a truncated end of the spirally wound steel strip whose connection portion is cut by a slanting connection port And the elliptical annular steel strip is connected to the elliptical annular steel strip through a connecting member;

The step S4 includes, after the elliptical annular steel strip is completed, according to the distance between the truncated end of the truncated wound steel strip and the adjacent side surface of the elliptical annular steel strip, The connecting piece connecting the truncated end of the truncated wound steel strip and the elliptical annular steel strip is respectively cut into the arc-shaped steel strip; pre-treating the connecting surface of the connecting member, the connecting piece Truncated ends and portions of the corresponding truncated wound steel strips respectively The corresponding connecting portions of the splicing segments are connected.

The method for manufacturing a steel-wound pipe elbow according to claim 6 or 7, wherein after the step S4, the method includes the step SA: the molten plastic cover seals the splicing section and the wound steel strip Exposed metal surface.

10. The method of manufacturing a steel-wound tube elbow according to claim 8, wherein after said step S4, comprising the step SA: a molten plastic covering the splicing section, the wound steel strip, and the The bare metal surface of the connector.