Quick connecting device for traction of flexible composite pipe and using method of quick connecting device

Abstract

The invention discloses a quick connecting device for traction of a flexible composite pipe and a using method of the quick connecting device. The quick connecting device comprises a connecting core rod I, a connecting assembly I, a connecting stud I, a connecting nut, a connecting stud II, a connecting assembly II and a connecting core rod II. The traction pipe and the inner pipe are coaxially arranged in a left-right spaced mode, a connecting core rod I, a connecting stud I, a connecting nut, a connecting stud II and a connecting core rod II are sequentially and coaxially arranged between the traction pipe and the inner pipe from left to right, the connecting core rod I is in threaded connection with the connecting stud I, and the connecting stud II is in threaded connection with the connecting core rod II. The left half part of the connecting core rod I is sleeved in the traction pipe and is fixed through a connecting assembly I; the right half part of the connecting core rod II is sleeved with the inner pipe and is fixed through a connecting assembly II; the right end of the connecting stud I is in threaded connection with the connecting nut, and the left end of the connecting stud II is rotationally connected with the connecting nut around the axial direction of the connecting nut, so that the traction pipe is connected with the inner pipe. The device is convenient and fast to mount and dismount, and can be reused.

Description

Technical Field

[0001] The present invention relates to the technical field of flexible composite pipe production, and in particular to a quick connection device for pulling a flexible composite pipe and a method of using the same. Background Art

[0002] Flexible composite pipes typically consist of multiple structural layers, including an inner tube layer, a pressure-bearing reinforcement layer, a cladding layer, and other functional layers. The inner tube layer is produced continuously, without downtime, by molten polymer extrusion through an extruder and die heating. The pressure-bearing reinforcement layer is wound using a steel strip wrapping machine, which wraps multiple strips around the pipe. The pipe must be stationary to facilitate the attachment of the strips.

[0003] During one-step continuous production, the inner tube is pulled out through a pull tube, moving forward at a constant speed. The reinforcement layer, on the other hand, is pre-wound and secured to the reinforcement layer pull tube using another pull tube. To minimize tape waste, the inner tube is fully qualified before being connected to the reinforcement pull tube. Because the inner tube is constantly moving forward, the two pull tubes must be connected quickly (typically within two minutes, calculated based on the gap between the wires and the travel speed).

[0004] Currently, the following methods are commonly used, but they all have corresponding defects: 1) Four holes are drilled evenly in the radial direction at the end of the reinforced layer traction tube in advance, and then a certain length of iron wire is inserted; when the inner tube is qualified, four holes are also drilled evenly in the radial direction at the front end of the inner tube, and are aligned axially with the four holes on the reinforced layer traction tube; when the two pipelines are docked, the winding machine is started to make the reinforced layer traction tube and the inner tube move forward synchronously, and at the same time, the iron wire that has been inserted in advance is inserted into the four holes at the front end of the inner tube and tightened to achieve connection; however, the difficulty of this method is that the speed of perforating multiple holes is slow, and it requires high operator proficiency, and connection failure is prone to occur, which requires cutting off the inner tube, re-drilling and reconnecting, which is a time-consuming and labor-intensive process.

[0005] 2) Prepare a log of about 0.5m in length in advance, and the outer diameter of the log should be within 1mm of the inner diameter of the pipe; then insert the end 0.25m of the reinforced layer traction tube first, and use screws to screw into the log from the outer wall of the pipe to connect the log and the reinforced layer traction tube. When the qualified inner tube is close to the log, align the log and the inner tube, and insert the log into the inner tube. When the inner tube completely covers the remaining 0.25m of the log, start the winding machine, make the reinforced layer traction tube and the inner tube move forward synchronously, and use screws to screw into the log from the outer wall of the pipe synchronously to connect the log and the inner tube. However, this method results in many holes on the log due to frequent screwing and repeated use of the log. When it is used many times, the connection will fail, resulting in failure of the traction machine. In addition, it is more difficult to operate the log when aligning the log and inserting it into the inner tube, and when the log is finally removed from the inner tube.

[0006] Therefore, the above problems need to be solved urgently. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a quick connection device for flexible composite pipe traction and its use method, which has a simple structure, is easy and quick to install and disassemble, has a firm connection, and can be reused, eliminating the cost of inspection and replacement.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions: A quick connection device for traction of a flexible composite pipe of the present invention, the innovation of which is that it includes a connecting core rod I, a connecting assembly I, a connecting stud I, a connecting nut, a connecting stud II, a connecting assembly II and a connecting core rod II; the traction pipe and the inner pipe are horizontally and transversely coaxially spaced on the left and right, and a connecting core rod I, a connecting stud I, a connecting nut, a connecting stud II and a connecting core rod II are horizontally and transversely coaxially arranged between the two from left to right, and the connecting core rod I and the connecting stud I are connected in sequence. The connecting stud I is threadedly connected, and the connecting stud II is threadedly connected to the connecting core rod II; the left half of the connecting core rod I is coaxially sleeved in the traction tube and fixedly connected to the traction tube through the connecting component I; the right half of the connecting core rod II is coaxially sleeved in the inner tube and fixedly connected to the inner tube through the connecting component II; the right end of the connecting stud I is threadedly fixed to the connecting nut, and the left end of the connecting stud II is connected to the connecting nut around its own axial rotation, thereby connecting the traction tube and the inner tube together.

[0009] Preferably, the connecting core rod I and the connecting stud I are both horizontally arranged cylindrical structures, and the outer diameter of the connecting core rod I matches the inner diameter of the traction tube, the length of the connecting core rod I is not less than the length of the connecting stud I, and its outer diameter is greater than the diameter of the connecting stud I; an internal threaded hole I matching the connecting stud I is also coaxially embedded vertically on the right end face of the connecting core rod I, and the opening depth of the internal threaded hole I is half the length of the connecting stud I; the left half of the connecting stud I is coaxially screwed and fixed to the connecting core rod I through the internal threaded hole I, and its right half extends out of the right side of the connecting core rod I.

[0010] Preferably, the connecting core rod II and the connecting stud II are both cylindrical structures arranged horizontally and transversely, and the outer diameter of the connecting core rod II matches the inner diameter of the inner tube, the transverse cross-section of the connecting stud II is T-shaped, and the left end of the connecting stud II is a large-diameter end with a diameter smaller than the outer diameter of the connecting nut, and the right end is a small-diameter end with a diameter smaller than the diameter of the connecting core rod II, and ensure that the length of its small-diameter end is less than the length of the connecting core rod II; an internal threaded hole II matching the small-diameter end of the connecting stud II is also coaxially embedded in the left end face of the connecting core rod II, and the opening depth of the internal threaded hole II is less than the length of the small-diameter end of the connecting stud II; the small-diameter end of the connecting stud II is coaxially screwed and fixed to the connecting core rod II through the internal threaded hole II, and its large-diameter end is located on the left side of the connecting core rod II.

[0011] Preferably, the left end face of the connecting nut is open, and the right end face thereof is closed, and a through hole is coaxially and vertically embedded in the middle position of the right end face thereof, which matches the small diameter end of the connecting stud II. The large diameter end of the connecting stud II is coaxially sleeved in the connecting nut, and its small diameter end coaxially passes through the right end face of the connecting nut through the through hole, and is coaxially screwed with the connecting core rod II, thereby limiting the right position of the connecting stud II through the connecting nut, and allowing the connecting stud II to rotate freely around the connecting nut; the outer diameter of the connecting stud I matches the inner diameter of the connecting nut, and its right end is screwed and fixed to the connecting nut, and does not contact the end face of the large diameter end of the connecting stud II, thereby limiting the left position of the connecting stud II while ensuring that there is no interference with the free rotation of the connecting stud II around the connecting nut, and when the connecting stud I is connected to the connecting stud II through the connecting nut, ensure that the connecting core rod I, the connecting nut and the connecting core rod II are coaxially spaced apart from each other.

[0012] Preferably, it also includes a limit ring I and a limit ring II; three limit rings I are sequentially spaced along the circumferential direction at the middle right position of the outer circumferential surface of the connecting core rod I, and the spacing between the three limit rings I are equal, and they are respectively fixedly connected coaxially with the connecting core rod I, and then the depth of the connecting core rod I coaxially inserted into the traction tube is limited by the limit ring I; three limit rings II are sequentially spaced along the circumferential direction at the middle left position of the outer circumferential surface of the connecting core rod II, and the spacing between the three limit rings II are equal, and they are respectively fixedly connected coaxially with the connecting core rod II, and then the depth of the connecting core rod II coaxially inserted into the inner tube is limited by the limit ring II.

[0013] Preferably, three push rod mounting grooves I are embedded in the interior of the connecting core rod I relative to the outer side of the connecting stud I in the circumferential direction, and each of the push rod mounting grooves I is respectively arranged in the fan-shaped area between the corresponding adjacent limiting rings I, and each of the push rod mounting grooves I is opened along the length direction of the connecting core rod I, so that the three push rod mounting grooves I and the three limiting rings I are alternately arranged in the circumferential direction; the left and right ends of each push rod mounting groove I respectively extend to the left and right end surfaces of the connecting core rod I, and then respectively extend vertically along the radial direction of the connecting core rod I to the corresponding position of the outer circumferential surface of the connecting core rod I, so that the cross-section of each push rod mounting groove I is U-shaped; Three push rod mounting grooves II are embedded in the interior of the connecting core rod II in sequence along the circumferential direction relative to the outer side of the connecting stud II. Each of the push rod mounting grooves II is arranged in a fan-shaped area between the corresponding adjacent limit rings II, and each of the push rod mounting grooves II is opened along the length direction of the connecting core rod II, so that the three push rod mounting grooves II and the three limit rings II are alternately arranged along the circumferential direction; the left and right ends of each push rod mounting groove II respectively extend to the left and right end faces of the connecting core rod II, and then extend vertically along the radial direction of the connecting core rod II to the corresponding positions of the outer circumferential surface of the connecting core rod II, so that the cross-section of each push rod mounting groove II is U-shaped.

[0014] Preferably, the connecting assembly I includes a push rod I, a mounting seat I, a boss I, a spring I, an end cover I and a limit screw I; each of the push rods I is a U-shaped structure that matches the push rod mounting slot I, and is respectively sleeved in the corresponding push rod mounting slot I along the path direction opened in the push rod mounting slot I, and the distance between the two open ends of each push rod I is greater than the distance between the two open ends of the corresponding push rod mounting slot I, and the horizontal length of its two open ends is less than the horizontal length of the two open ends of the corresponding push rod mounting slot I, so that each push rod I slides horizontally along the length direction of the connecting core rod I in the corresponding push rod mounting slot I, and the sliding of the corresponding push rod I is controlled by the connecting core rod I. The left and right limit movements are performed; the right open end of each of the push rods Ⅰ extends radially out of the outer circumferential surface of the connecting core rod Ⅰ, and its left open end does not extend out of the outer circumferential surface of the connecting core rod Ⅰ, and an inclined surface Ⅰ is inclined toward the left direction at the middle position of the end surface of the left open end of each of the push rods Ⅰ, and each of the inclined surfaces Ⅰ is arranged toward the center direction of the connecting core rod Ⅰ; a mounting seat Ⅰ is also horizontally provided on the left side of the left open end of each of the push rod mounting grooves Ⅰ, and each of the mounting seats Ⅰ is flush with the outer circumferential surface of the connecting core rod Ⅰ, and is respectively fixedly connected to the corresponding position of the connecting core rod Ⅰ, and does not produce any horizontal sliding of the corresponding push rod Ⅰ. Interference; a boss Ⅰ with a T-shaped cross section is provided radially along the connecting core rod Ⅰ between the middle position of the inner surface of each of the mounting seats Ⅰ and the bottom surface of the corresponding push rod mounting groove Ⅰ, and the small diameter end of each of the boss Ⅰ extends vertically out of the outer surface of the corresponding mounting seat Ⅰ, and a spring Ⅰ is coaxially sleeved thereon relative to the mounting seat Ⅰ and the large diameter end of the boss Ⅰ, and the spring force of the spring Ⅰ ensures that the small diameter end of the boss Ⅰ does not exceed the outer circumferential surface of the connecting core rod Ⅰ; a positioning hole Ⅰ that matches the small diameter end of the boss Ⅰ is vertically embedded and penetrated on the outer circumferential surface of the traction tube relative to each boss Ⅰ, and between each of the positioning holes Ⅰ and the right end surface of the traction tube The spacing is consistent with the spacing between each of the bosses Ⅰ and the corresponding limit ring Ⅰ, and each boss Ⅰ is coaxially inserted into the corresponding positioning hole Ⅰ by sliding the push rod Ⅰ horizontally to the left, thereby fixing the connecting core rod Ⅰ and the traction tube together; a circular end cover Ⅰ is coaxially sleeved on the connecting stud Ⅰ relative to the right side of the connecting core rod Ⅰ, and a limit screw Ⅰ is vertically screwed on the right side of the end cover Ⅰ relative to each push rod Ⅰ. The threaded end of each limit screw Ⅰ extends into the corresponding push rod mounting groove Ⅰ, and is in close contact with the side of the right open end of the corresponding push rod Ⅰ, thereby positioning the horizontal sliding of the push rod Ⅰ.

[0015] Preferably, the connecting assembly II includes a push rod II, a mounting seat II, a boss II, a spring II, an end cover II and a limit screw II; each of the push rods II is a U-shaped structure that matches the push rod mounting groove II, and is respectively sleeved in the corresponding push rod mounting groove II along the path direction of the push rod mounting groove II, and the distance between the two open ends of each push rod II is greater than the distance between the two open ends of the corresponding push rod mounting groove II, and the horizontal length of its two open ends is less than the horizontal length of the two open ends of the corresponding push rod mounting groove II, thereby making each push rod II slide horizontally along the length direction of the connecting core rod II in the corresponding push rod mounting groove II, and the connecting core rod II is connected to the corresponding push rod II. Sliding to limit left and right; the left open end of each push rod II extends radially out of the outer circumferential surface of the connecting core rod II, and its right open end does not extend out of the outer circumferential surface of the connecting core rod II, and an inclined surface II is provided in the middle position of the end surface of the right open end of each push rod II, and each inclined surface II is arranged toward the center direction of the connecting core rod II; a mounting seat II is also horizontally provided on the right side of the right open end of each push rod mounting groove II, and each mounting seat II is flush with the outer circumferential surface of the connecting core rod II, and is respectively fixedly connected to the corresponding position of the connecting core rod II, and respectively limits the horizontal sliding of the corresponding push rod II. Interference is generated; a boss II with a T-shaped cross-section is provided radially along the connecting core rod II between the middle position of the inner surface of each mounting seat II and the bottom surface of the corresponding push rod mounting groove II, and the small diameter end of each boss II extends vertically out of the outer surface of the corresponding mounting seat II, and a spring II is coaxially sleeved thereon relative to the mounting seat II and the large diameter end of the boss II, and the spring force of the spring II ensures that the small diameter end of the boss II does not exceed the outer circumferential surface of the connecting core rod II; a positioning hole II is vertically embedded and penetrated on the outer circumferential surface of the inner tube relative to each boss II position, and each positioning hole II and the left end surface of the inner tube are connected. The spacing between them is consistent with the spacing between each of the bosses II and the corresponding limit rings II, and by sliding the push rod II horizontally to the right, each boss II is coaxially inserted into the corresponding positioning hole II, and then the connecting core rod II and the inner tube are fixed together; a circular end cover II is coaxially sleeved on the connecting stud II relative to the left side of the connecting core rod II, and a limit screw II is vertically screwed on the left side of the end cover II relative to each push rod II position, and the threaded end of each limit screw II extends into the corresponding push rod mounting groove II, and is in close contact with the side of the left open end of the corresponding push rod II, thereby determining the horizontal sliding of the push rod II.

[0016] Preferably, a punching assembly is also included, and the punching assembly includes a sleeve and a limit ring III; the inner diameter of the sleeve matches the outer diameter of the inner tube, and both its left and right ends are open; a circular limit ring III is coaxially sleeved and fixed on the end face of one end of the sleeve, and the inner diameter of the limit ring III is smaller than the inner diameter of the inner tube; three positioning holes III matching the small diameter end of the boss II are also provided in sequence and at equal intervals along the circumferential direction of the outer circumferential surface of the sleeve, and the opening position of each positioning hole III corresponds to the opening position of each positioning hole II; the distance between each positioning hole III and the inner surface of the limit ring III is consistent with the distance between each positioning hole II and the left end face of the inner tube, and then when the sleeve is coaxially sleeved on the inner tube from the left side, the opening position of the positioning hole II on the inner tube is determined by the positioning hole III.

[0017] The invention provides a method for using a quick-connect device for pulling a flexible composite pipe, the innovation of which lies in the following steps: (1) First, screw the connecting core rod I and the connecting stud I together, then coaxially sleeve the large diameter end of the connecting stud II into the connecting nut, and coaxially pass the small diameter end of the connecting stud II through the through hole to the right end face of the connecting nut, and coaxially screw the connecting core rod II together; (2) Then the right end of the connecting stud I is screwed and fixed with the connecting nut, and it does not contact the end face of the large diameter end of the connecting stud II. At this time, the connecting core rod I is connected to the connecting core rod II through the connecting nut, and the connecting core rod II can rotate freely around the connecting nut along with the connecting stud II; (3) Then, the left half of the connecting core rod I is coaxially inserted into the traction tube until the limiting ring I is in close contact with the right end face of the traction tube. At this time, each push rod I is pushed to the left one by one, so that each boss I is coaxially inserted into the corresponding positioning hole I; then, each limiting screw I is tightened so that it is in close contact with the side face of the right open end of the corresponding push rod I, and then the push rod I is positioned, so that the connecting core rod I and the traction tube can be fixed together; (4) Then, the sleeve is coaxially sleeved onto the inner tube from the left side until the limit ring III is in close contact with the left end face of the inner tube. At this time, the location of the positioning hole II on the inner tube can be determined through the positioning hole III, and three corresponding positioning holes II are opened on the inner tube; (5) Then, insert the right half of the connecting core rod II into the inner tube coaxially until the limiting ring II is in close contact with the left end face of the inner tube. At this time, push each push rod II to the right one by one, so that each boss II is coaxially inserted into the corresponding positioning hole II; then tighten each limiting screw II so that it is in close contact with the left open end side of the corresponding push rod II, and then position the push rod II, so that the connecting core rod II and the inner tube can be fixed together, and the traction tube and the inner tube can be connected together; (6) After the traction tube has exited the coating traction machine, loosen the limit screw II and push the push rod II to the left. At this time, under the action of the spring force of spring II, each boss II is retracted into the connecting core rod II. At this time, the connecting core rod II can be pulled out of the inner tube to complete the work.

[0018] Beneficial effects of the present invention: (1) The present invention has a simple structure, is easy and quick to install and disassemble, has a reliable connection, and can be reused, eliminating the cost of inspection and replacement; (2) The present invention is highly safe and will not cause traction failure problems, thus ensuring production efficiency and reducing the waste of inner tube materials caused by re-traction of the machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 The figure is a schematic structural diagram of a quick-connect device for pulling a flexible composite pipe according to the present invention.

[0021] Figure 2 The figure is a schematic diagram of the internal structure of a quick-connect device for pulling a flexible composite pipe according to the present invention.

[0022] Figure 3 It is a structural schematic diagram of the punching assembly of the present invention.

[0023] Among them, 1-traction tube; 2-connecting core rod Ⅰ; 3-connecting stud Ⅰ; 4-limiting ring Ⅰ; 5-end cover Ⅰ; 6-limiting screw Ⅰ; 7-push rod Ⅰ; 8-mounting seat Ⅰ; 9-boss Ⅰ; 10-spring Ⅰ; 11-positioning hole Ⅰ; 12-push rod mounting groove Ⅰ; 13-connecting nut; 14-inner tube; 15-connecting core rod Ⅱ; 16-connecting stud Ⅱ; 17-limiting ring Ⅱ; 18-end cover Ⅱ; 19-limiting screw Ⅱ; 20-push rod Ⅱ; 21-mounting seat Ⅱ; 22-boss Ⅱ; 23-spring Ⅱ; 24-positioning hole Ⅱ; 25-push rod mounting groove Ⅱ; 26-sleeve; 27-limiting ring Ⅲ; 28-positioning hole Ⅲ. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be clearly and completely described below through specific implementation methods.

[0025] The present invention relates to a quick connection device for pulling a flexible composite pipe, comprising a connection core rod Ⅰ2, a connection assembly Ⅰ, a connection stud Ⅰ3, a connection nut 13, a connection stud Ⅱ16, a connection assembly Ⅱ and a connection core rod Ⅱ15; the specific structure is as follows Figures 1-3 As shown, the traction tube 1 and the inner tube 14 are horizontally and transversely coaxially spaced to the left and right, and a connecting core rod I2, a connecting stud I3, a connecting nut 13, a connecting stud II16 and a connecting core rod II15 are horizontally and transversely coaxially provided therebetween from left to right. The connecting core rod I2 is screwed to the connecting stud I3, and the connecting stud II16 is screwed to the connecting core rod II15; the left half of the connecting core rod I2 is coaxially sleeved in the traction tube 1 and fixedly connected to the traction tube 1 through the connecting component I; the right half of the connecting core rod II15 is coaxially sleeved in the inner tube 14 and fixedly connected to the inner tube 14 through the connecting component II; the right end of the connecting stud I3 is screwed and fixed to the connecting nut 13, and the left end of the connecting stud II16 is connected to the connecting nut 13 for rotation around its own axial direction, thereby connecting the traction tube 1 and the inner tube 14 together.

[0026] like Figure 1 、 Figure 2 As shown, the connecting core rod Ⅰ2 and the connecting stud Ⅰ3 are both cylindrical structures arranged horizontally, and the outer diameter of the connecting core rod Ⅰ2 matches the inner diameter of the traction tube 1. The length of the connecting core rod Ⅰ2 is not less than the length of the connecting stud Ⅰ3, and its outer diameter is greater than the diameter of the connecting stud Ⅰ3; the right end face of the connecting core rod Ⅰ2 is also coaxially embedded with an internal threaded hole Ⅰ that matches the connecting stud Ⅰ3, and the opening depth of the internal threaded hole Ⅰ is half the length of the connecting stud Ⅰ3; the left half of the connecting stud Ⅰ3 is coaxially screwed and fixed to the connecting core rod Ⅰ2 through the internal threaded hole Ⅰ, and its right half extends out of the right side face of the connecting core rod Ⅰ2.

[0027] like Figure 1 、 Figure 2 As shown, the connecting core rod Ⅱ15 and the connecting stud Ⅱ16 are both cylindrical structures arranged horizontally, and the outer diameter of the connecting core rod Ⅱ15 matches the inner diameter of the inner tube 14. The transverse cross-section of the connecting stud Ⅱ16 is T-shaped, and the left end of the connecting stud Ⅱ16 is a large-diameter end with a diameter smaller than the outer diameter of the connecting nut 13, and the right end is a small-diameter end with a diameter smaller than the diameter of the connecting core rod Ⅱ15, and ensure that the length of its small-diameter end is less than the length of the connecting core rod Ⅱ15; the left end face of the connecting core rod Ⅱ15 is also coaxially embedded with an internal threaded hole Ⅱ that matches the small-diameter end of the connecting stud Ⅱ16, and the opening depth of the internal threaded hole Ⅱ is less than the length of the small-diameter end of the connecting stud Ⅱ16; the small-diameter end of the connecting stud Ⅱ16 is coaxially screwed and fixed to the connecting core rod Ⅱ15 through the internal threaded hole Ⅱ, and its large-diameter end is located on the left side of the connecting core rod Ⅱ15.

[0028] like Figure 1 、 Figure 2 As shown, the left end face of the connecting nut 13 is open, and the right end face thereof is closed, and a through hole is provided in the middle position of the right end face thereof coaxially and vertically embedded through it, which matches the small diameter end of the connecting stud Ⅱ16. The large diameter end of the connecting stud Ⅱ16 is coaxially sleeved in the connecting nut 13, and its small diameter end coaxially passes through the right end face of the connecting nut 13 through the through hole, and is coaxially screwed with the connecting core rod Ⅱ15, thereby limiting the right position of the connecting stud Ⅱ16 through the connecting nut 13, and allowing the connecting stud Ⅱ16 to self-screw around the connecting nut 13. By rotation; the outer diameter of the connecting stud Ⅰ3 matches the inner diameter of the connecting nut 13, and its right end is screwed and fixed with the connecting nut 13, and has no contact with the large diameter end face of the connecting stud Ⅱ16, thereby ensuring that there is no interference with the free rotation of the connecting stud Ⅱ16 around the connecting nut 13, while limiting the left position of the connecting stud Ⅱ16, and when the connecting stud Ⅰ3 is connected to the connecting stud Ⅱ16 through the connecting nut 13, ensure that the connecting core rod Ⅰ2, the connecting nut 13 and the connecting core rod Ⅱ15 are all coaxially spaced apart from each other.

[0029] like Figure 1 、 Figure 2 As shown, three limit rings I4 are sequentially provided at intervals along the circumferential direction at the middle right position of the outer circumferential surface of the connecting core rod I2, and the spacing between the three limit rings I4 are equal, and they are respectively fixedly connected to the connecting core rod I2 coaxially, thereby limiting the depth of the connecting core rod I2 coaxially inserted into the traction tube 1 through the limit ring I4; three limit rings II17 are sequentially provided at intervals along the circumferential direction at the middle left position of the outer circumferential surface of the connecting core rod II15, and the spacing between the three limit rings II17 are equal, and they are respectively fixedly connected to the connecting core rod II15 coaxially, thereby limiting the depth of the connecting core rod II15 coaxially inserted into the inner tube 14 through the limit ring II17.

[0030] like Figure 1 、 Figure 2 As shown, three push rod mounting grooves Ⅰ12 are embedded in the interior of the connecting core rod Ⅰ2 relative to the outside of the connecting stud Ⅰ3 in sequence along the circumferential direction. Each push rod mounting groove Ⅰ12 is respectively arranged in the fan-shaped area between the corresponding adjacent limit rings Ⅰ4, and each push rod mounting groove Ⅰ12 is opened along the length direction of the connecting core rod Ⅰ2, so that the three push rod mounting grooves Ⅰ12 and the three limit rings Ⅰ4 are alternately arranged in the circumferential direction; the left and right ends of each push rod mounting groove Ⅰ12 respectively extend to the left and right end faces of the connecting core rod Ⅰ2, and then extend vertically along the radial direction of the connecting core rod Ⅰ2 to the corresponding position of the outer circumferential surface of the connecting core rod Ⅰ2, so that the cross-section of each push rod mounting groove Ⅰ12 is U-shaped.

[0031] like Figure 1 、 Figure 2As shown, three push rod mounting grooves II 25 are embedded in the interior of the connecting core rod II 15 at intervals along the circumferential direction relative to the outer side of the connecting stud II 16. Each push rod mounting groove II 25 is respectively arranged in the fan-shaped area between the corresponding adjacent limit rings II 17, and each push rod mounting groove II 25 is opened along the length direction of the connecting core rod II 15, so that the three push rod mounting grooves II 25 and the three limit rings II 17 are alternately arranged in the circumferential direction; the left and right ends of each push rod mounting groove II 25 respectively extend to the left and right end faces of the connecting core rod II 15, and then extend vertically along the radial direction of the connecting core rod II 15 to the corresponding position of the outer circumferential surface of the connecting core rod II 15, so that the cross-section of each push rod mounting groove II 25 is U-shaped.

[0032] The connecting assembly I of the present invention comprises a push rod I7, a mounting seat I8, a boss I9, a spring I10, an end cover I5 and a limit screw I6; Figure 1 、 Figure 2 As shown, each push rod Ⅰ7 is a U-shaped structure that matches the push rod mounting groove Ⅰ12, and is respectively sleeved in the corresponding push rod mounting groove Ⅰ12 along the path direction opened by the push rod mounting groove Ⅰ12. The distance between the two open ends of each push rod Ⅰ7 is greater than the distance between the two open ends of the corresponding push rod mounting groove Ⅰ12, and the transverse length of its two open ends is less than the transverse length of the two open ends of the corresponding push rod mounting groove Ⅰ12, thereby making each push rod Ⅰ7 slide horizontally along the length direction of the connecting core rod Ⅰ2 in the corresponding push rod mounting groove Ⅰ12, and the sliding of the corresponding push rod Ⅰ7 is limited to the left and right by the connecting core rod Ⅰ2; the right open end of each push rod Ⅰ7 extends radially out of the outer circumferential surface of the connecting core rod Ⅰ2, and the left open end thereof does not extend out of the outer circumferential surface of the connecting core rod Ⅰ2, and an inclined surface Ⅰ is inclined toward the left direction at the middle position of the end surface of the left open end of each push rod Ⅰ7, and each inclined surface Ⅰ is arranged toward the center direction of the connecting core rod Ⅰ2; like Figure 1 、 Figure 2As shown, a mounting seat Ⅰ8 is horizontally provided at the left side position inside the left open end of each push rod mounting groove Ⅰ12, and each mounting seat Ⅰ8 is arranged flush with the outer circumferential surface of the connecting core rod Ⅰ2, and is fixedly connected to the corresponding position of the connecting core rod Ⅰ2, and does not interfere with the horizontal sliding of the corresponding push rod Ⅰ7; a boss Ⅰ9 with a T-shaped cross section is provided radially along the connecting core rod Ⅰ2 between the middle position of the inner surface of each mounting seat Ⅰ8 and the bottom surface of the corresponding push rod mounting groove Ⅰ12, and the small diameter end of each boss Ⅰ9 extends vertically out of the outer surface of the corresponding mounting seat Ⅰ8, and a spring Ⅰ10 is coaxially sleeved thereon relative to the mounting seat Ⅰ8 and the large diameter end of the boss Ⅰ9, and the spring force of the spring Ⅰ10 ensures that the small diameter end of the boss Ⅰ9 does not exceed the outer circumferential surface of the connecting core rod Ⅰ2; on the outer circumferential surface of the traction tube 1 relative to each boss A positioning hole Ⅰ11 matching the small diameter end of the boss Ⅰ9 is also vertically embedded in the position Ⅰ9, and the distance between each positioning hole Ⅰ11 and the right end face of the traction tube 1 is consistent with the distance between each boss Ⅰ9 and the corresponding limit ring Ⅰ4, and each boss Ⅰ9 is coaxially inserted into the corresponding positioning hole Ⅰ11 by sliding the push rod Ⅰ7 horizontally to the left, thereby fixing the connecting core rod Ⅰ2 and the traction tube 1 together; a circular end cover Ⅰ5 is coaxially sleeved on the connecting stud Ⅰ3 relative to the right side of the connecting core rod Ⅰ2, and a limit screw Ⅰ6 is vertically screwed on the right side of the end cover Ⅰ5 relative to each push rod Ⅰ7 position, and the threaded end of each limit screw Ⅰ6 extends into the corresponding push rod mounting groove Ⅰ12, and is in close contact with the side of the right open end of the corresponding push rod Ⅰ7, thereby positioning the horizontal sliding of the push rod Ⅰ7.

[0033] The connecting assembly II of the present invention includes a push rod II 20, a mounting seat II 21, a boss II 22, a spring II 23, an end cover II 18 and a limit screw II 19; Figure 1 、 Figure 2 As shown, each push rod II 20 is a U-shaped structure that matches the push rod mounting groove II 25, and is respectively sleeved in the corresponding push rod mounting groove II 25 along the path direction of the push rod mounting groove II 25. The distance between the two open ends of each push rod II 20 is greater than the distance between the two open ends of the corresponding push rod mounting groove II 25, and the lateral length of its two open ends is less than the lateral length of the two open ends of the corresponding push rod mounting groove II 25, thereby making each push rod II 20 slide horizontally along the length direction of the connecting core rod II 15 in the corresponding push rod mounting groove II 25, and the sliding of the corresponding push rod II 20 is limited left and right by the connecting core rod II 15; the left open end of each push rod II 20 extends radially out of the outer circumferential surface of the connecting core rod II 15, and the right open end does not extend out of the outer circumferential surface of the connecting core rod II 15, and an inclined surface II is inclined toward the right direction at the middle position of the end surface of the right open end of each push rod II 20, and each inclined surface II is arranged toward the center direction of the connecting core rod II 15; like Figure 1 、 Figure 2 As shown, a mounting seat Ⅱ21 is horizontally provided on the right side of the right open end of each push rod mounting groove Ⅱ25. Each mounting seat Ⅱ21 is flush with the outer circumferential surface of the connecting core rod Ⅱ15, and is fixedly connected to the corresponding position of the connecting core rod Ⅱ15, and does not interfere with the horizontal sliding of the corresponding push rod Ⅱ20. A boss Ⅱ22 with a T-shaped cross section is provided along the radial direction of the connecting core rod Ⅱ15 between the middle position of the inner surface of each mounting seat Ⅱ21 and the bottom surface of the corresponding push rod mounting groove Ⅱ25. The small diameter end of each boss Ⅱ22 extends vertically out of the outer surface of the corresponding mounting seat Ⅱ21, and a spring Ⅱ23 is coaxially sleeved thereon relative to the mounting seat Ⅱ21 and the large diameter end of the boss Ⅱ22, and the spring force of the spring Ⅱ23 ensures that the small diameter end of the boss Ⅱ22 does not exceed the outer circumferential surface of the connecting core rod Ⅱ15; the outer circumferential surface of the inner tube 14 is relative to each boss. The position Ⅱ22 is also vertically embedded with a positioning hole Ⅱ24 that matches the small diameter end of the boss Ⅱ22, and the distance between each positioning hole Ⅱ24 and the left end face of the inner tube 14 is consistent with the distance between each boss Ⅱ22 and the corresponding limit ring Ⅱ17, and by sliding the push rod Ⅱ20 horizontally to the right, each boss Ⅱ22 is coaxially inserted into the corresponding positioning hole Ⅱ24, thereby fixing the connecting core rod Ⅱ15 and the inner tube 14 together; an annular end cover Ⅱ18 is coaxially sleeved on the connecting stud Ⅱ16 relative to the left side of the connecting core rod Ⅱ15, and a limit screw Ⅱ19 is vertically screwed on the left side of the end cover Ⅱ18 relative to each push rod Ⅱ20 position, and the threaded end of each limit screw Ⅱ19 extends into the corresponding push rod mounting groove Ⅱ25, and is in close contact with the side of the left open end of the corresponding push rod Ⅱ20, thereby determining the horizontal sliding of the push rod Ⅱ20.

[0034] The punching assembly of the present invention includes a sleeve 26 and a limiting ring III 27; Figure 3 As shown, the inner diameter of the sleeve 26 matches the outer diameter of the inner tube 14, and both its left and right ends are open; a circular limit ring III 27 is coaxially sleeved and fixed on one end face of the sleeve 26, and the inner diameter of the limit ring III 27 is smaller than the inner diameter of the inner tube 14; three positioning holes III 28 matching the small diameter end of the boss II 22 are also opened in the outer circumferential surface of the sleeve 26 at equal intervals along its circumferential direction, and the opening position of each positioning hole III 28 corresponds to the opening position of each positioning hole II 24; the distance between each positioning hole III 28 and the inner surface of the limit ring III 27 is consistent with the distance between each positioning hole II 24 and the left end face of the inner tube 14, and then when the sleeve 26 is coaxially sleeved on the inner tube 14 from the left side, the opening position of the positioning hole II 24 on the inner tube 14 is determined by the positioning hole III 28.

[0035] The invention provides a method for using a quick-connect device for pulling a flexible composite pipe, such as Figures 1-3 As shown, the following steps are included: (1) First, screw the connecting core rod I2 and the connecting stud I3 together, then coaxially sleeve the large diameter end of the connecting stud II16 into the connecting nut 13, and coaxially pass the small diameter end of the connecting stud II through the through hole to the right end face of the connecting nut 13, and coaxially screw it to the connecting core rod II15.

[0036] (2) Then the right end of the connecting stud I3 is screwed and fixed to the connecting nut 13, and is not in contact with the large diameter end face of the connecting stud II16. At this time, the connecting core rod I2 is connected to the connecting core rod II15 through the connecting nut 13, and the connecting core rod II15 can rotate freely around the connecting nut 13 along with the connecting stud II16.

[0037] (3) Then, the left half of the connecting core rod I2 is coaxially inserted into the traction tube 1 until the limiting ring I4 is in close contact with the right end face of the traction tube 1. At this time, each push rod I7 is pushed to the left one by one, so that each boss I9 is ​​coaxially inserted into the corresponding positioning hole I11; then, each limiting screw I6 is tightened so that it is in close contact with the side face of the right open end of the corresponding push rod I7, and then the push rod I7 is positioned, so that the connecting core rod I2 and the traction tube 1 can be fixed together.

[0038] (4) Then, the sleeve 26 is coaxially sleeved on the inner tube 14 from the left side until the limit ring III 27 is in close contact with the left end face of the inner tube 14. At this time, the position of the positioning hole II 24 on the inner tube 14 can be determined by the positioning hole III 28, and three corresponding positioning holes II 24 are opened on the inner tube 14.

[0039] (5) Then, the right half of the connecting core rod II 15 is coaxially inserted into the inner tube 14 until the limiting ring II 17 is in close contact with the left end face of the inner tube 14. At this time, each push rod II 20 is pushed to the right one by one, so that each boss II 22 is coaxially inserted into the corresponding positioning hole II 24; then, each limiting screw II 19 is tightened so that it is in close contact with the left open end side face of the corresponding push rod II 20, and then the push rod II 20 is positioned, so that the connecting core rod II 15 and the inner tube 14 can be fixedly connected together, and the traction tube 1 and the inner tube 14 can be connected together.

[0040] (6) After the traction tube 1 has exited the coating traction machine, loosen the limit screw II19 and push the push rod II20 to the left. At this time, under the action of the spring force of spring II23, each boss II22 is retracted into the connecting core rod II15. At this time, the connecting core rod II15 can be pulled out of the inner tube 14 to complete the work.

[0041] Beneficial effects of the present invention: (1) The present invention has a simple structure, is easy and quick to install and disassemble, has a reliable connection, and can be reused, eliminating the cost of inspection and replacement; (2) The present invention has high safety and will not cause traction failure problems, thus ensuring production efficiency and reducing the waste of inner tube 14 materials caused by re-traction.

[0042] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements to the technical solutions of the present invention made by ordinary engineering technicians in this field should fall within the scope of protection of the present invention. The technical contents to be protected by the present invention have been fully recorded in the technical requirements.

Claims

1. A quick-connect device for pulling a flexible composite pipe, characterized by: It includes a connecting core rod I, a connecting component I, a connecting stud I, a connecting nut, a connecting stud II, a connecting component II and a connecting core rod II; the traction tube and the inner tube are horizontally and transversely coaxially spaced to the left and right, and a connecting core rod I, a connecting stud I, a connecting nut, a connecting stud II and a connecting core rod II are horizontally and transversely coaxially arranged between the two from left to right, the connecting core rod I is screwed to the connecting stud I, and the connecting stud II is screwed to the connecting core rod II; the left half of the connecting core rod I is coaxially sleeved in the traction tube and fixedly connected to the traction tube through the connecting component I; the right half of the connecting core rod II is coaxially sleeved in the inner tube and fixedly connected to the inner tube through the connecting component II; the right end of the connecting stud I is screwed and fixed to the connecting nut, and the left end of the connecting stud II is connected to the connecting nut around its own axial rotation, thereby connecting the traction tube and the inner tube together.

2. A quick-connect device for pulling a flexible composite pipe according to claim 1, characterized in that: The connecting core rod I and the connecting stud I are both cylindrical structures arranged horizontally and transversely, and the outer diameter of the connecting core rod I matches the inner diameter of the traction tube. The length of the connecting core rod I is not less than the length of the connecting stud I, and its outer diameter is greater than the diameter of the connecting stud I; an internal threaded hole I matching the connecting stud I is also coaxially embedded vertically on the right end face of the connecting core rod I, and the opening depth of the internal threaded hole I is half the length of the connecting stud I; the left half of the connecting stud I is coaxially screwed and fixed to the connecting core rod I through the internal threaded hole I, and its right half extends out of the right side of the connecting core rod I.

3. A quick-connect device for pulling a flexible composite pipe according to claim 2, characterized in that: The connecting core rod II and the connecting stud II are both cylindrical structures arranged horizontally, and the outer diameter of the connecting core rod II matches the inner diameter of the inner tube. The transverse cross-section of the connecting stud II is T-shaped, and the left end of the connecting stud II is a large-diameter end with a diameter smaller than the outer diameter of the connecting nut, and the right end is a small-diameter end with a diameter smaller than the diameter of the connecting core rod II, and ensure that the length of its small-diameter end is less than the length of the connecting core rod II; an internal threaded hole II matching the small-diameter end of the connecting stud II is also coaxially embedded in the left end face of the connecting core rod II, and the opening depth of the internal threaded hole II is less than the length of the small-diameter end of the connecting stud II; the small-diameter end of the connecting stud II is coaxially screwed and fixed to the connecting core rod II through the internal threaded hole II, and its large-diameter end is located on the left side of the connecting core rod II.

4. A quick-connect device for pulling a flexible composite pipe according to claim 3, characterized in that: The left end face of the connecting nut is open, and the right end face is closed, and in the middle position of the right end face, a through hole is coaxially embedded and penetrated, which matches the small diameter end of the connecting stud II. The large diameter end of the connecting stud II is coaxially sleeved in the connecting nut, and its small diameter end coaxially passes through the right end face of the connecting nut through the through hole, and is coaxially screwed with the connecting core rod II, thereby limiting the right position of the connecting stud II through the connecting nut, and allowing the connecting stud II to rotate freely around the connecting nut; the outer diameter of the connecting stud I matches the inner diameter of the connecting nut, and its right end is screwed and fixed to the connecting nut, and does not contact the end face of the large diameter end of the connecting stud II, thereby ensuring that there is no interference with the free rotation of the connecting stud II around the connecting nut, and limiting the left position of the connecting stud II, and when the connecting stud I is connected to the connecting stud II through the connecting nut, ensure that the connecting core rod I, the connecting nut and the connecting core rod II are coaxially spaced apart from each other.

5. A quick-connect device for pulling a flexible composite pipe according to claim 4, characterized in that: It also includes a limit ring I and a limit ring II; three limit rings I are sequentially arranged at intervals along the circumferential direction at the middle right position of the outer circumferential surface of the connecting core rod I, and the spacing between the three limit rings I are equal, and they are respectively fixedly connected to the connecting core rod I coaxially, and then the depth of the connecting core rod I coaxially inserted into the traction tube is limited by the limit ring I; three limit rings II are sequentially arranged at intervals along the circumferential direction at the middle left position of the outer circumferential surface of the connecting core rod II, and the spacing between the three limit rings II are equal, and they are respectively fixedly connected to the connecting core rod II coaxially, and then the depth of the connecting core rod II coaxially inserted into the inner tube is limited by the limit ring II.

6. A quick-connect device for pulling a flexible composite pipe according to claim 5, characterized in that: Three push rod mounting grooves I are embedded in the connecting core rod I in sequence and spaced apart along the circumferential direction relative to the outer side of the connecting stud I. Each of the push rod mounting grooves I is spaced apart in the fan-shaped area between the corresponding adjacent limiting rings I, and each of the push rod mounting grooves I is opened along the length direction of the connecting core rod I, so that the three push rod mounting grooves I and the three limiting rings I are alternately spaced apart along the circumferential direction; the left and right ends of each of the push rod mounting grooves I extend to the positions close to the left and right end faces of the connecting core rod I, and then extend perpendicularly and radially along the connecting core rod I to the corresponding positions on the outer circumferential surface of the connecting core rod I, so that the cross-section of each push rod mounting groove I is U-shaped; Three push rod mounting grooves II are embedded in the interior of the connecting core rod II in sequence along the circumferential direction relative to the outer side of the connecting stud II. Each of the push rod mounting grooves II is arranged in a fan-shaped area between the corresponding adjacent limit rings II, and each of the push rod mounting grooves II is opened along the length direction of the connecting core rod II, so that the three push rod mounting grooves II and the three limit rings II are alternately arranged along the circumferential direction; the left and right ends of each push rod mounting groove II respectively extend to the left and right end faces of the connecting core rod II, and then extend vertically along the radial direction of the connecting core rod II to the corresponding positions of the outer circumferential surface of the connecting core rod II, so that the cross-section of each push rod mounting groove II is U-shaped.

7. A quick-connect device for pulling a flexible composite pipe according to claim 6, characterized in that: The connecting assembly I includes a push rod I, a mounting seat I, a boss I, a spring I, an end cover I and a limit screw I; each of the push rods I is a U-shaped structure that matches the push rod mounting groove I, and is respectively sleeved in the corresponding push rod mounting groove I along the path direction of the push rod mounting groove I, and the distance between the two open ends of each push rod I is greater than the distance between the two open ends of the corresponding push rod mounting groove I, and the horizontal length of its two open ends is less than the horizontal length of the two open ends of the corresponding push rod mounting groove I, so that each push rod I slides horizontally along the length direction of the connecting core rod I in the corresponding push rod mounting groove I, and the sliding of the corresponding push rod I is controlled by the connecting core rod I. Left and right limit; the right open end of each of the push rods Ⅰ extends radially out of the outer circumferential surface of the connecting core rod Ⅰ, and its left open end does not extend out of the outer circumferential surface of the connecting core rod Ⅰ, and a slope Ⅰ is provided in the middle position of the end face of the left open end of each of the push rods Ⅰ, and each of the slopes Ⅰ is arranged toward the center direction of the connecting core rod Ⅰ; a mounting seat Ⅰ is also horizontally provided on the left side of the left open end of each of the push rod mounting grooves Ⅰ, and each of the mounting seats Ⅰ is flush with the outer circumferential surface of the connecting core rod Ⅰ, and is respectively fixedly connected to the corresponding position of the connecting core rod Ⅰ, and does not interfere with the horizontal sliding of the corresponding push rod Ⅰ. ; A boss I with a T-shaped cross section is provided radially along the connecting core rod I between the middle position of the inner surface of each mounting seat I and the bottom surface of the corresponding push rod mounting groove I, and the small diameter end of each boss I extends vertically out of the outer surface of the corresponding mounting seat I, and a spring I is coaxially sleeved thereon relative to the mounting seat I and the large diameter end of the boss I, and the spring force of the spring I ensures that the small diameter end of the boss I does not exceed the outer circumferential surface of the connecting core rod I; a positioning hole I that matches the small diameter end of the boss I is vertically embedded and penetrated on the outer circumferential surface of the traction tube relative to each boss I, and the space between each positioning hole I and the right end surface of the traction tube The spacing is consistent with the spacing between each of the bosses Ⅰ and the corresponding limit ring Ⅰ, and by sliding the push rod Ⅰ horizontally to the left, each boss Ⅰ is coaxially inserted into the corresponding positioning hole Ⅰ, thereby fixing the connecting core rod Ⅰ and the traction tube together; a circular end cover Ⅰ is coaxially sleeved on the connecting stud Ⅰ relative to the right side of the connecting core rod Ⅰ, and a limit screw Ⅰ is vertically screwed on the right side of the end cover Ⅰ relative to each push rod Ⅰ. The threaded end of each limit screw Ⅰ extends into the corresponding push rod mounting groove Ⅰ, and is in close contact with the side of the right open end of the corresponding push rod Ⅰ, thereby positioning the horizontal sliding of the push rod Ⅰ.

8. A quick-connect device for pulling a flexible composite pipe according to claim 7, characterized in that: The connecting assembly II includes a push rod II, a mounting seat II, a boss II, a spring II, an end cover II and a limit screw II; each of the push rods II is a U-shaped structure that matches the push rod mounting groove II, and is respectively sleeved in the corresponding push rod mounting groove II along the path direction of the push rod mounting groove II. The distance between the two open ends of each push rod II is greater than the distance between the two open ends of the corresponding push rod mounting groove II, and the horizontal length of its two open ends is less than the horizontal length of the two open ends of the corresponding push rod mounting groove II, so that each push rod II slides horizontally along the length direction of the connecting core rod II in the corresponding push rod mounting groove II, and the sliding of the corresponding push rod II is carried out by the connecting core rod II. The left and right limit lines are arranged; the left open end of each of the push rods II extends radially out of the outer circumferential surface of the connecting core rod II, and the right open end thereof does not extend out of the outer circumferential surface of the connecting core rod II, and an inclined surface II is provided in the middle position of the end surface of the right open end of each of the push rods II, and each of the inclined surfaces II is arranged toward the center direction of the connecting core rod II; a mounting seat II is also horizontally provided on the right side of the right open end of each of the push rod mounting grooves II, and each of the mounting seats II is flush with the outer circumferential surface of the connecting core rod II, and is respectively fixedly connected to the corresponding position of the connecting core rod II, and does not produce any horizontal sliding of the corresponding push rod II. Interference; a boss II with a T-shaped cross section is provided radially along the connecting core rod II between the middle position of the inner surface of each mounting seat II and the bottom surface of the corresponding push rod mounting groove II, and the small diameter end of each boss II extends vertically out of the outer surface of the corresponding mounting seat II, and a spring II is coaxially sleeved thereon relative to the mounting seat II and the large diameter end of the boss II, and the spring force of the spring II ensures that the small diameter end of the boss II does not exceed the outer circumferential surface of the connecting core rod II; a positioning hole II is vertically embedded and penetrated on the outer circumferential surface of the inner tube relative to each boss II position, and between each positioning hole II and the left end surface of the inner tube The spacing is consistent with the spacing between each of the bosses II and the corresponding limit ring II, and by sliding the push rod II horizontally to the right, each boss II is coaxially inserted into the corresponding positioning hole II, and then the connecting core rod II and the inner tube are fixed together; a circular end cover II is coaxially sleeved on the connecting stud II relative to the left side of the connecting core rod II, and a limit screw II is vertically screwed on the left side of the end cover II relative to each push rod II position, and the threaded end of each limit screw II extends into the corresponding push rod mounting groove II, and is in close contact with the side of the left open end of the corresponding push rod II, thereby determining the horizontal sliding of the push rod II.

9. A quick-connect device for pulling a flexible composite pipe according to claim 8, characterized in that: It also includes a punching assembly, and the punching assembly includes a sleeve and a limit ring III; the inner diameter of the sleeve matches the outer diameter of the inner tube, and both its left and right ends are open; a circular limit ring III is coaxially sleeved and fixed on the end face of one end of the sleeve, and the inner diameter of the limit ring III is smaller than the inner diameter of the inner tube; three positioning holes III that match the small diameter end of the boss II are also opened in sequence and at equal intervals along the circumferential direction on the outer circumferential surface of the sleeve, and the opening position of each positioning hole III corresponds to the opening position of each positioning hole II; the distance between each positioning hole III and the inner surface of the limit ring III is consistent with the distance between each positioning hole II and the left end face of the inner tube, and then when the sleeve is coaxially sleeved on the inner tube from the left side, the opening position of the positioning hole II on the inner tube is determined by the positioning hole III.

10. The method for using the quick-connect device for pulling a flexible composite pipe according to claim 9, characterized in that The following steps are involved: (1) First, screw the connecting core rod I and the connecting stud I together, then coaxially sleeve the large diameter end of the connecting stud II into the connecting nut, and coaxially pass the small diameter end of the connecting stud II through the through hole to the right end face of the connecting nut, and coaxially screw the connecting core rod II together; (2) Then the right end of the connecting stud I is screwed and fixed with the connecting nut, and it does not contact the end face of the large diameter end of the connecting stud II. At this time, the connecting core rod I is connected to the connecting core rod II through the connecting nut, and the connecting core rod II can rotate freely around the connecting nut along with the connecting stud II; (3) Then, the left half of the connecting core rod I is coaxially inserted into the traction tube until the limiting ring I is in close contact with the right end face of the traction tube. At this time, each push rod I is pushed to the left one by one, so that each boss I is coaxially inserted into the corresponding positioning hole I; then, each limiting screw I is tightened so that it is in close contact with the side face of the right open end of the corresponding push rod I, and then the push rod I is positioned, so that the connecting core rod I and the traction tube can be fixed together; (4) Then, the sleeve is coaxially sleeved onto the inner tube from the left side until the limit ring III is in close contact with the left end face of the inner tube. At this time, the location of the positioning hole II on the inner tube can be determined through the positioning hole III, and three corresponding positioning holes II are opened on the inner tube; (5) Then, insert the right half of the connecting core rod II into the inner tube coaxially until the limiting ring II is in close contact with the left end face of the inner tube. At this time, push each push rod II to the right one by one, so that each boss II is coaxially inserted into the corresponding positioning hole II; then tighten each limiting screw II so that it is in close contact with the left open end side of the corresponding push rod II, and then position the push rod II, so that the connecting core rod II and the inner tube can be fixed together, and the traction tube and the inner tube can be connected together; (6) After the traction tube has exited the coating traction machine, loosen the limit screw II and push the push rod II to the left. At this time, under the action of the spring force of spring II, each boss II is retracted into the connecting core rod II. At this time, the connecting core rod II can be pulled out of the inner tube to complete the work.

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