Steel-plastic composite pressure pipe and production process thereof

Abstract

The invention relates to the field of intercepting pipelines, in particular to a steel-plastic composite pressure pipe and a production process thereof.The steel-plastic composite pressure pipe comprises an outer plastic layer, a steel pipe layer and an inner plastic layer, the outer plastic layer and the steel pipe layer are connected in a bonded mode through an outer rubber layer, the steel pipe layer and the inner plastic layer are connected in a bonded mode through an inner rubber layer, and a composite body is formed; a variable flow ball is rotationally connected to the middle position of the reinforcing section of the steel pipe layer, the upper portion and the lower portion of the variable flow ball are each provided with a first liquid passing opening, the two first liquid passing openings communicate with each other through a first liquid passing channel, second liquid passing openings are formed in the circumferential direction of the variable flow ball and deviate from the first liquid passing openings by 60 degrees, and the two second liquid passing openings communicate with each other through a second liquid passing channel; and the reinforcing section of the steel pipe layer is provided with a rotating mechanism for driving the variable flow ball to rotate, so that a traditional valve body can be replaced without occupying a larger space.

Description

Technical Field

[0001] The invention relates to the field of building pipeline equipment, in particular to a steel-plastic composite pressure pipe with high strength, corrosion resistance and long service life and a production process thereof. Background Art

[0002] In the prior art, although ordinary plastic pipes are widely used in many fields such as public buildings, urban water supply pipeline systems, gas transmission systems, etc., they are easily deformed and broken by external collisions or extrusion due to their poor compression and tensile properties. In addition, ordinary plastic pipes are prone to corrosion and aging in high temperature and acid-base environments, and have a short service life, which brings great inconvenience to maintenance. At the same time, because the steel-plastic composite pressure pipe contains a metal layer, it can be processed into various composite structures, thereby having more functions, such as adding a valve body thereon or processing it into a special shape.

[0003] When a valve body is added to a steel-plastic composite pipe in the prior art, the switch of the valve body often occupies a large space and is not convenient for arrangement in a narrow range.

[0004] In view of this, the present invention proposes a steel-plastic composite pressure pipe and a production process thereof to solve the above technical problems. Summary of the invention

[0005] In order to solve the deficiencies of the prior art, the present invention provides a steel-plastic composite pressure pipe, which can replace the function of a traditional valve body by occupying a larger space.

[0006] The technical solution of the present invention is: a steel-plastic composite pressure pipe, wherein the steel-plastic composite pressure pipe includes an outer plastic layer, a steel pipe layer and an inner plastic layer, the outer plastic layer and the steel pipe layer are bonded and connected by the outer rubber layer, and the steel pipe layer and the inner plastic layer are bonded and connected by the inner rubber layer to form a composite body, the steel pipe layer includes a reinforcement section, the thickness of the reinforcement section of the steel pipe layer is higher than the thickness of the remaining part of the steel pipe layer, a variable flow ball is rotatably connected to the middle position of the reinforcement section of the steel pipe layer, a first liquid opening is respectively provided at the upper and lower parts of the variable flow ball, the two first liquid openings are connected by a first liquid passage, a second liquid opening is provided along the circumference of the variable flow ball with a deviation of 60° from the first liquid opening, the two second liquid openings are connected by a second liquid passage, the second liquid passage bypasses the first liquid passage, and the reinforcement section of the steel pipe layer is provided with a rotating mechanism for driving the variable flow ball to rotate.

[0007] Furthermore, the rotating mechanism includes a rotating sleeve and a rotating gear. The rotating sleeve is rotatably connected to the reinforcement section of the steel tube layer. A gear mounting groove is provided on the inner side of the middle of the rotating sleeve. The variable flow ball passes through the reinforcement section of the steel tube layer and is fixedly connected to a rotating gear via a rotating shaft. The rotating sleeve is machined with teeth meshing with the rotating gear at the lower side of the gear mounting groove.

[0008] Furthermore, a stop groove is evenly arranged in the circumference of the rotating shaft, and a stop sliding groove is arranged in the reinforcement section of the steel pipe layer corresponding to the stop groove, a stop slider is slidably connected in the stop sliding groove, a stop spring is arranged between the stop slider and the bottom surface of the stop sliding groove, and the two ends of the stop spring are respectively fixedly connected to the stop slider and the bottom surface of the stop sliding groove, the stop slider and the stop groove are in sliding contact, and the parts of the stop slider and the stop groove in sliding contact are processed into a smooth shape.

[0009] Furthermore, the reinforced section of the steel tube layer is provided with a flow sealing device corresponding to the strain flow ball, and the flow sealing device includes a flow sealing mechanism, a flow sealing lifting rod and a side extension rod. The thickened section of the steel tube layer is provided with flow sealing grooves at the upper and lower sides of the strain flow ball, the flow sealing mechanism is arranged in the flow sealing groove and is slidably connected to the flow sealing groove, and a flow sealing lifting rod for lifting the flow sealing mechanism is provided at one end of the flow sealing mechanism away from the flow changing ball. The thickened section of the steel tube layer is provided with a lifting groove corresponding to the flow sealing groove, and a flow sealing lifting rod is slidably connected in the lifting groove. The thickened section of the steel tube layer is provided with a lateral groove corresponding to the lifting groove, and a side extension rod is fixedly connected to the flow sealing lifting rod, and the side extension rod is slidably connected to the lateral groove. The reinforced section of the steel tube layer is also provided with a tensioning mechanism for pressing the flow sealing mechanism against the flow changing ball.

[0010] Furthermore, the flow-sealing mechanism includes a flow-sealing rubber ring and a flow-sealing pressure ring. The flow-sealing rubber ring is slidably connected in the flow-sealing slide groove along the vertical direction. The end of the flow-sealing rubber ring that contacts the flow-changing ball is in contact with the flow-changing ball. A pressure groove is provided in the flow-sealing rubber ring. An annular flow-sealing pressure ring is arranged in the pressure groove. The lower ends of the cross-sections of the pressure groove and the flow-sealing pressure ring are matched inverted trapezoids. The end of the flow-sealing pressure ring away from the flow-changing ball is fixedly connected to a flow-sealing lifting rod, and the flow-sealing lifting rod slides through the flow-sealing rubber ring.

[0011] Furthermore, one end of the outer side of the flow-sealing chute close to the flow-changing ball is processed into an inclined surface shape approaching the inner side of the flow-sealing chute.

[0012] Furthermore, the tensioning mechanism includes a tensioning slider and a tensioning spring. A vertical slide groove is opened in the reinforcement section of the steel pipe layer between the upper and lower corresponding lateral grooves. A tensioning slider is slidably connected in the upper and lower directions of the vertical slide groove. The tensioning sliders at the upper and lower positions respectively pass through the upper and lower bottom surfaces of the vertical slide groove and are fixedly connected to the upper and lower side extension rods. A tensioning spring is arranged between the two tensioning sliders, and the upper and lower ends of the tensioning spring are fixedly connected to the two tensioning sliders.

[0013] Furthermore, annular separation grooves are provided at the upper and lower ends of the rotating sleeve corresponding to the side extension rods, and a fastening portion is provided at every 60° in the separation groove near the middle of the rotating sleeve in the vertical direction, and there is a smooth transition between the fastening portion and the separation groove.

[0014] In addition, the present invention also provides a corresponding production process of a steel-plastic composite pressure pipe, comprising the following steps:

[0015] S1: The outer plastic layer and the steel pipe layer are bonded and connected by the outer rubber layer, and the steel pipe layer and the inner plastic layer are bonded and connected by the inner rubber layer to form a composite body, thereby ensuring the sealing performance and improving the rigidity of the pressure pipe;

[0016] S2: The outer plastic layer and the inner plastic layer are made of non-polar polyethylene, which has stable chemical properties and is not easily corroded and aged in various acidic and alkaline environments, thus extending the service life;

[0017] S3: The steel pipe layer can be made of high-strength alloy steel, thereby increasing the service life of the pressure pipe.

[0018] Beneficial effects of the present invention:

[0019] (1) In the present invention, the rotation mechanism can drive the flow-changing ball to rotate, so that the first liquid passage, the second liquid passage and the unopened portion on the flow-changing ball correspond to the opening of the reinforced section of the steel tube layer, respectively, wherein the cross-sectional areas of the first liquid passage and the second liquid passage are different, thereby playing the role of changing the flow rate and intercepting the flow. The rotation mechanism is wrapped around the outer side of the reinforced section of the steel tube layer, so that it does not occupy more space while playing the above-mentioned role.

[0020] (2) In the present invention, the sealing device can closely fit the surface of the flow-changing ball, thereby playing a role of intercepting flow. It should be prevented that liquid passes through the composite pressure pipe. During this process, the tensioning mechanism will apply tension to the side extension rod, and the side extension rod will apply pressure to the sealing mechanism through the sealing lifting rod, so that the sealing mechanism is pressed against the surface of the flow-changing ball, thereby playing a role of intercepting flow and improving the sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 for Figure 1 The enlarged schematic diagram at A in the middle;

[0024] Figure 3 It is a schematic diagram of the internal structure of the variable flow ball in the present invention;

[0025] Figure 4 for Figure 3 The enlarged schematic diagram of point B in the middle;

[0026] Figure 5 It is a schematic structural diagram of the flow sealing device in the present invention.

[0027] In the figure:

[0028] 1. Outer plastic layer;

[0029] 2. Steel pipe layer; 21. Reinforcement section; 22. Stop sliding groove; 23. Stop slider; 24. Stop spring; 25. Sealing flow groove; 26. Lifting groove; 27. Lateral groove; 28. Vertical groove;

[0030] 3. Inner plastic layer;

[0031] 4. variable flow ball; 41. first liquid opening; 42. first liquid passage; 43. second liquid opening; 44. second liquid passage;

[0032] 5. Rotating mechanism; 51. Rotating sleeve; 511. Gear mounting groove; 512. Separation groove; 513. Fastening part; 52. Rotating gear; 53. Rotating shaft; 531. Stop groove;

[0033] 6. Flow sealing device; 61. Flow sealing mechanism; 611. Flow sealing rubber ring; 6111. Compression groove; 612. Flow sealing compression ring; 62. Flow sealing lifting rod; 63. Side extension rod; 64. Tensioning mechanism; 641. Tensioning slider; 642. Tensioning spring. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0035] like Figures 1 to 5 As shown, the present invention provides a steel-plastic composite pressure pipe, comprising an outer plastic layer 1, a steel tube layer 2 and an inner plastic layer 3, wherein the outer plastic layer 1 and the steel tube layer 2 are bonded and connected by an outer rubber layer, and the steel tube layer 2 and the inner plastic layer 3 are bonded and connected by an inner rubber layer to form a composite body, wherein the steel tube layer 2 comprises a reinforcement section 21, wherein the thickness of the reinforcement section 21 of the steel tube layer 2 is higher than the thickness of the remaining part of the steel tube layer 2, and a flow-changing ball 4 is rotatably connected at the middle position of the reinforcement section 21 of the steel tube layer 2, wherein a first liquid passage 41 is respectively provided at the upper and lower parts of the flow-changing ball 4, and the two first liquid passages 41 are connected by a first liquid passage 42, and a second liquid passage 43 is provided along the circumference of the flow-changing ball 4 at a deviation of 60° from the first liquid passage 41, and the two second liquid passages 43 are connected by a second liquid passage 44, and the second liquid passage 44 bypasses the first liquid passage 42, and the reinforcement section 21 of the steel tube layer 2 is provided with a rotating mechanism 5 for driving the flow-changing ball 4 to rotate.

[0036] Among them, the outer plastic layer 1 and the inner plastic layer 3 are made of non-polar material polyethylene, which has stable chemical properties and is not easy to corrode and age in various acidic and alkaline environments, thereby extending the service life. The steel pipe layer 2 is used to enhance the compressive and tensile properties of the pipeline. The rotation mechanism 5 can drive the rotation of the variable flow ball 4, so that the first liquid port 41, the second liquid port 43 and the unopened part on the variable flow ball 4 correspond to the opening of the reinforcement section 21 of the steel pipe layer 2 respectively, wherein the cross-sectional areas of the first liquid channel 42 and the second liquid channel 44 are not the same, thereby playing a role in changing the flow rate and intercepting the flow. The rotating mechanism 5 is wrapped around the outer side of the reinforcement section 21 of the steel pipe layer 2, so that it will not take up more space while playing the above-mentioned role.

[0037] like Figures 1 to 5 As shown, the rotating mechanism 5 includes a rotating sleeve 51 and a rotating gear 52. The rotating sleeve 51 is rotatably connected to the reinforcement section 21 of the steel tube layer 2. A gear mounting groove 511 is provided on the inner side of the middle of the rotating sleeve 51. The variable flow ball 4 passes through the reinforcement section 21 of the steel tube layer 2 and is fixedly connected to a rotating gear 52 via a rotating shaft 53. The rotating sleeve 51 is processed with teeth meshing with the rotating gear 52 at the lower side of the gear mounting groove 511.

[0038] When the rotating mechanism 5 drives the variable flow ball 4 to rotate, the rotating sleeve 51 is rotated, the teeth on the rotating sleeve 51 drive the rotating gear 52 to rotate, and the rotating gear 52 drives the variable flow ball 4 to rotate.

[0039] like Figures 1 to 5 As shown, the rotating shaft 53 is evenly provided with three stop grooves 531 in the circumferential direction, and the reinforcement section 21 of the steel tube layer 2 is provided with a stop sliding groove 22 corresponding to the stop groove 531. A stop slider 23 is slidably connected in the stop sliding groove 22, and a stop spring 24 is arranged between the stop slider 23 and the bottom surface of the stop sliding groove 22, and the two ends of the stop spring 24 are respectively fixedly connected to the stop slider 23 and the bottom surface of the stop sliding groove 22, and the stop slider 23 is in sliding contact with the stop groove 531, and the sliding contact parts of the stop slider 23 and the stop groove 531 are processed into a smooth shape.

[0040] In the process of the rotating gear 52 driving the variable flow ball 4 to rotate, the rotating shaft 53 will also rotate synchronously. When it rotates to the position corresponding to the stop groove 531 and the stop sliding groove 22, the stop sliding block 23 will be pressed into the stop groove 531 under the pressure of the stop spring 24. The three stop grooves 531 are spaced 60° apart and correspond to the first liquid port 41, the second liquid port 43 and the position between the first liquid port 41 and the second liquid port 43, respectively, thereby generating a damping feeling, so that the user can know the rotation status of the variable flow ball 4.

[0041] like Figures 1 to 5 As shown, the reinforcement section 21 of the steel tube layer 2 is provided with a sealing device 6 corresponding to the flow-changing ball 4, and the sealing device 6 includes a sealing mechanism 61, a sealing lifting rod 62 and a side extension rod 63. The thickened section of the steel tube layer 2 is provided with a sealing chute 25 corresponding to the flow-changing ball 4 on the upper and lower sides of the flow-changing ball 4, and the sealing mechanism 61 is arranged in the sealing chute 25 and is slidably connected to the sealing chute 25. The end of the sealing mechanism 61 away from the flow-changing ball 4 is provided with a sealing lifting rod for lifting the sealing mechanism 61. A pull rod 62, a lifting groove 26 is provided in the thickened section of the steel tube layer 2 corresponding to the flow-sealing chute 25, and a flow-sealing lifting rod 62 is slidably connected in the lifting groove 26, a lateral groove 27 is provided in the thickened section of the steel tube layer 2 corresponding to the lifting groove 26, a lateral extension rod 63 is fixedly connected to the flow-sealing lifting rod 62, and the lateral extension rod 63 is slidably connected to the lateral groove 27, and a tensioning mechanism 64 for making the flow-sealing mechanism 61 press the flow-changing ball 4 is also provided in the reinforced section 21 of the steel tube layer 2.

[0042] When it is necessary to seal the flow, the sealing device 6 can closely fit the surface of the flow-changing ball 4, thereby playing a role of flow interception. Liquid should be prevented from passing through the composite pressure pipe. During this process, the tensioning mechanism 64 will apply a pulling force to the side extension rod 63, and the side extension rod 63 will apply pressure to the sealing mechanism 61 through the sealing lifting rod 62, so that the sealing mechanism 61 is pressed against the surface of the flow-changing ball 4, thereby playing a role of flow interception.

[0043] like Figures 1 to 5 As shown, the flow-sealing mechanism 61 includes a flow-sealing rubber ring 611 and a flow-sealing clamping ring 612. The flow-sealing rubber ring 611 is slidably connected in the flow-sealing slot 25 along the vertical direction. The end of the flow-sealing rubber ring 611 that contacts the flow-changing ball 4 fits with the flow-changing ball 4. A clamping groove 6111 is provided in the flow-sealing rubber ring 611. An annular flow-sealing clamping ring 612 is provided in the clamping groove 6111. The lower ends of the cross-sections of the clamping groove 6111 and the flow-sealing clamping ring 612 are matched inverted trapezoids. The end of the flow-sealing clamping ring 612 away from the flow-changing ball 4 is fixedly connected to the flow-sealing lifting rod 62, and the flow-sealing lifting rod 62 slides through the flow-sealing rubber ring 611.

[0044] like Figure 4 As shown, one end of the outer side of the flow-sealing chute 25 close to the flow-changing ball 4 is processed into an inclined surface close to the inner side of the flow-sealing chute 25 .

[0045] In the process of the sealing lifting rod 62 pressing the sealing mechanism 61, the sealing lifting rod 62 will apply pressure to the sealing clamping ring 612. The lower ends of the cross-sections of the sealing clamping ring 612 and the clamping groove 6111 are adapted inverted trapezoids, which can generate lateral clamping force in the process of clamping the sealing rubber ring 611, so that the sealing rubber ring 611 can better fit the flow-changing ball 4. Similarly, the outer side of the sealing groove 25, close to the flow-changing ball 4, is processed into an inclined surface close to the inner side of the sealing groove 25, which can further squeeze the sealing rubber ring, thereby producing a better interception effect.

[0046] like Figures 1 to 5 As shown, the tensioning mechanism 64 includes a tensioning slider 641 and a tensioning spring 642. The reinforcement section 21 of the steel pipe layer 2 is provided with a vertical slide groove 28 between the upper and lower corresponding lateral grooves 27. A tensioning slider 641 is slidably connected in the upper and lower directions of the vertical slide groove 28. The tensioning sliders 641 located at the upper and lower positions respectively pass through the upper and lower bottom surfaces of the vertical slide groove 28 and are fixedly connected to the upper and lower side extension rods 63. A tensioning spring 642 is arranged between the two tensioning sliders 641. The upper and lower ends of the tensioning spring 642 are fixedly connected to the two tensioning sliders 641.

[0047] The tensioning slider 641 is pulled by the tensioning spring 642 so that the tensioning slider 641 applies pressure to the side extension rod 63 .

[0048] like Figure 5 As shown, annular separation grooves 512 are provided at the upper and lower ends of the rotating sleeve 51 corresponding to the side extension rods 63, and the separation grooves 512 are provided with fastening portions 513 near the middle of the rotating sleeve 51 in the vertical direction every 60°, and the fastening portions 513 and the separation grooves 512 have a smooth transition.

[0049] During the rotation of the rotating sleeve 51, the side extension rod 63 slides along the separation groove 512. When the side extension rod 63 reaches the position of the fastening part 513, under the action of the tensioning spring 642, the side extension rod 63 and the flow-sealing lifting rod 62 will drive the flow-sealing mechanism 61 to fit on the surface of the flow-changing ball 4. At this time, the first liquid through hole 41, the second liquid through hole 43 or the unopened part between the two on the flow-changing ball 4 correspond to the liquid through hole of the reinforced section 21 of the steel pipe layer 2. When the rotating sleeve 51 continues to rotate, the side extension rod 63 will be separated from the fastening part 513. At this time, the side extension rod 63 will connect with the flow-sealing lifting rod 62 to drive the flow-sealing mechanism 61 away from the flow-changing ball 4. This can prevent the friction between the flow-changing ball 4 and the flow-sealing rubber ring 611 from affecting the rotation of the flow-changing ball 4 when the flow rate of the pressure pipe is changed or the flow is intercepted.

[0050] In addition, the present invention also provides a corresponding production process of a steel-plastic composite pressure pipe, comprising the following steps:

[0051] S1: The outer plastic layer 1 and the steel pipe layer 2 are bonded and connected by the outer rubber layer, and the steel pipe layer 2 and the inner plastic layer 3 are bonded and connected by the inner rubber layer to form a composite body, thereby ensuring the sealing performance and improving the rigidity of the pressure pipe;

[0052] S2: The outer plastic layer 1 and the inner plastic layer 3 are made of non-polar polyethylene, which has stable chemical properties and is not easily corroded and aged in various acidic and alkaline environments, thus extending the service life;

[0053] S3: The steel pipe layer 2 can be made of high-strength alloy steel, thereby increasing the service life of the pressure pipe.

[0054] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A steel-plastic composite pressure pipe, comprising an outer plastic layer (1), a steel pipe layer (2) and an inner plastic layer (3), wherein the outer plastic layer (1) and the steel pipe layer (2) are bonded and fixedly connected, and the steel pipe layer (2) and the inner plastic layer (3) are bonded and fixedly connected to form a composite body, characterized in that: The steel tube layer (2) comprises a reinforcement section (21), a flow-changing ball (4) is rotatably connected to the middle position of the reinforcement section (21) of the steel tube layer (2), a first liquid-passing opening (41) is respectively provided at the upper and lower parts of the flow-changing ball (4), and the two first liquid-passing openings (41) are connected via a first liquid-passing passage (42). The reinforcement section (21) of the steel tube layer (2) is provided with a flow sealing device (6) corresponding to the strain flow ball (4), and the flow sealing device (6) comprises a flow sealing mechanism (61), a flow sealing lifting rod (62) and a side extension rod (63). The thickened section of the steel tube layer (2) is provided with a flow-sealing chute (25) on the upper and lower sides of the flow-changing ball (4) corresponding to the flow-changing ball (4); the flow-sealing mechanism (61) is arranged in the flow-sealing chute (25) and is slidably connected to the flow-sealing chute (25); the end of the flow-sealing mechanism (61) away from the flow-changing ball (4) is provided with a flow-sealing lifting rod (62) for lifting the flow-sealing mechanism (61); the thickened section of the steel tube layer (2) is provided with a lifting groove (26) corresponding to the flow-sealing chute (25) ), a flow-sealing lifting rod (62) is slidably connected in the lifting groove (26), a lateral groove (27) is provided in the thickened section of the steel tube layer (2) corresponding to the lifting groove (26), a lateral extension rod (63) is fixedly connected to the flow-sealing lifting rod (62), and the lateral extension rod (63) is slidably connected to the lateral groove (27), and a tensioning mechanism (64) for making the flow-sealing mechanism (61) press the flow-changing ball (4) is also provided in the reinforced section (21) of the steel tube layer (2).

2. The steel-plastic composite pressure pipe according to claim 1, characterized in that: The thickness of the reinforcement section (21) of the steel tube layer (2) is higher than the thickness of the rest of the steel tube layer (2). A second liquid opening (43) is provided along the circumference of the variable flow ball (4) at a 60° deviation from the first liquid opening (41). The two second liquid openings (43) are connected via a second liquid passage (44). The second liquid passage (44) bypasses the first liquid passage (42). The reinforcement section (21) of the steel tube layer (2) is provided with a rotating mechanism (5) for driving the variable flow ball (4) to rotate.

3. The steel-plastic composite pressure pipe according to claim 2, characterized in that: The rotating mechanism (5) comprises a rotating sleeve (51) and a rotating gear (52); the rotating sleeve (51) is rotatably connected to the reinforcement section (21) of the steel tube layer (2); a gear mounting groove (511) is provided on the inner side of the middle of the rotating sleeve (51); the variable flow ball (4) passes through the reinforcement section (21) of the steel tube layer (2) and is fixedly connected to a rotating gear (52) via a rotating shaft (53); and the rotating sleeve (51) is provided with teeth meshing with the rotating gear (52) at the lower side of the gear mounting groove (511).

4. The steel-plastic composite pressure pipe according to claim 3, characterized in that: The rotating shaft (53) is evenly provided with three stop grooves (531) in the circumferential direction, and the reinforcement section (21) of the steel tube layer (2) is provided with a stop sliding groove (22) corresponding to the stop groove (531), and a stop slider (23) is slidably connected in the stop sliding groove (22), and a stop spring (24) is provided between the stop slider (23) and the bottom surface of the stop sliding groove (22), and the two ends of the stop spring (24) are respectively fixedly connected to the stop slider (23) and the bottom surface of the stop sliding groove (22), and the stop slider (23) and the stop groove (531) are in sliding contact, and the sliding contact parts of the stop slider (23) and the stop groove (531) are processed into a smooth shape.

5. The steel-plastic composite pressure pipe according to claim 4, characterized in that: The flow sealing mechanism (61) comprises a flow sealing rubber ring (611) and a flow sealing clamping ring (612). The flow sealing slide groove (25) is slidably connected with the flow sealing rubber ring (611) in the vertical direction. The end of the flow sealing rubber ring (611) that contacts the flow changing ball (4) fits with the flow changing ball (4). The flow sealing rubber ring (611) is provided with a clamping groove (6111). The clamping groove (6111) is provided with an annular flow sealing clamping ring (612). The lower ends of the cross sections of the clamping groove (6111) and the flow sealing clamping ring (612) are inverted trapezoids that match each other. The end of the flow sealing clamping ring (612) that is away from the flow changing ball (4) is fixedly connected with a flow sealing lifting rod (62). The flow sealing lifting rod (62) slides through the flow sealing rubber ring (611).

6. The steel-plastic composite pressure pipe according to claim 5, characterized in that: The end of the outer side of the flow-sealing chute (25) close to the flow-changing ball (4) is processed into an inclined surface shape approaching the inner side of the flow-sealing chute (25).

7. The steel-plastic composite pressure pipe according to claim 6, characterized in that: The tensioning mechanism (64) includes a tensioning slider (641) and a tensioning spring (642). The reinforcement section (21) of the steel tube layer (2) is provided with a vertical slide groove (28) between the upper and lower corresponding lateral grooves (27). A tensioning slider (641) is slidably connected in the upper and lower directions of the vertical slide groove (28). The tensioning sliders (641) located at the upper and lower positions respectively pass through the upper and lower bottom surfaces of the vertical slide groove (28) and are fixedly connected to the upper and lower side extension rods (63). A tensioning spring (642) is provided between the two tensioning sliders (641). The upper and lower ends of the tensioning spring (642) are fixedly connected to the two tensioning sliders (641).

8. The steel-plastic composite pressure pipe according to claim 7, characterized in that: Circular separation grooves (512) are provided at the upper and lower ends of the rotating sleeve (51) corresponding to the side extension rods (63), and the separation grooves (512) are provided with fastening portions (513) close to the middle of the rotating sleeve (51) in the vertical direction at intervals of (60) degrees, and a smooth transition is formed between the fastening portions (513) and the separation grooves (512).

9. A processing technology for the steel-plastic composite pressure pipe according to claim 8, characterized in that: The process includes the following steps: S1: The outer plastic layer (1) and the steel tube layer (2) are bonded together by the outer rubber layer, and the steel tube layer (2) and the inner plastic layer (3) are bonded together by the inner rubber layer to form a composite body; S2: The outer plastic layer (1) and the inner plastic layer (3) are made of non-polar material polyethylene; S3: The steel pipe layer (2) can be made of high-strength alloy steel.

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