CN111922156A

CN111922156A - Corrugated pipe and corrugated pipe forming system

Info

Publication number: CN111922156A
Application number: CN202010765045.3A
Authority: CN
Inventors: 陆凯鑫
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-08-03
Filing date: 2020-08-03
Publication date: 2020-11-13

Abstract

The invention relates to a corrugated pipe and a corrugated pipe forming system. Bellows forming system includes installation component, tubulose subassembly, two cross pressure subassemblies and pushing down the mechanism, and the installation component includes base plate, two L shape framves and two returning face plates, and two L shape framves are protruding respectively to be located the relative both ends of base plate, and two returning face plates install in the relative both ends of base plate with rotating respectively, have seted up the bar and have led to the groove on the returning face plate, and the tubulose subassembly includes two half pipes of shaping and two fixed axles, and two half pipes of shaping all support on the base plate. The corrugated pipe formed by the corrugated pipe forming system is convenient to take materials.

Description

Corrugated pipe and corrugated pipe forming system

Technical Field

The invention relates to a corrugated pipe and a corrugated pipe forming system.

Background

Bellows are a common industrial element, commonly used as a measuring element. When working, the pipe is extended along the length direction under the action of internal pressure, so that the movable end generates displacement in a certain relation with the pressure. The movable end drives the pointer to directly indicate the pressure. Bellows are often combined with displacement sensors to form pressure sensors that output an electrical quantity, sometimes also acting as isolation elements. The response speed of the bellows is slower than that of the bourdon tube because of the large volume change required for the expansion of the bellows. However, in a general corrugated pipe forming mechanism, after the corrugated pipe is formed, the corrugated pipe is located inside the tubular mold, so that the corrugated pipe is not convenient to take.

Disclosure of Invention

Therefore, it is necessary to provide a corrugated pipe and a corrugated pipe forming system with convenient material taking.

A corrugated pipe forming system comprises a mounting assembly, a tubular assembly, two transverse pressing assemblies and a pressing mechanism, wherein the mounting assembly comprises a base plate, two L-shaped frames and two turnover plates, the two L-shaped frames are respectively convexly arranged at two opposite ends of the base plate, the two turnover plates are respectively and rotatably arranged at two opposite ends of the base plate, strip-shaped through grooves are formed in the turnover plates, the tubular assembly comprises two forming half pipes and two fixed shafts, the two forming half pipes are supported on the base plate, the two fixed shafts are mutually and alternately fixed in the middle of the base plate, the bottom ends of the two forming half pipes are respectively connected to the two fixed shafts through first torsion springs, the two first torsion springs are used for enabling the two forming half pipes to rotate to be away from each other, the two transverse pressing assemblies are respectively arranged on the two L-shaped frames, the pressing mechanism is arranged on the base plate and used for driving a circular pipe to move downwards between the two forming half pipes, the two transverse pressing assemblies are used for, and pressing and holding the round pipe by using an outer pipe die to form the corrugated pipe.

In one embodiment, the bottom end of the turnover plate is connected to the end of the base plate through a second torsion spring, and the two second torsion springs are used for enabling the two turnover plates to automatically turn over to be away from each other.

In one of them embodiment, the horizontal pressure subassembly includes horizontal pressure cylinder, push rod, horizontal pole and locating piece, and horizontal pressure cylinder installs on L shape frame, and the push rod is fixed in on the output shaft of horizontal pressure cylinder and the activity is worn to locate the strip of returning face plate and is led to the inslot, and the middle part vertical fixation of horizontal pole is on the push rod and supports and hold on the returning face plate, and the locating piece is fixed in the tip of push rod.

In one embodiment, the cross rod is a cylindrical rod and is abutted against one side of the turnover plate, which is far away from the positioning block, the positioning block is in a rectangular block shape, and the two positioning blocks are respectively positioned above the two fixing shafts.

In one embodiment, a semicircular groove is formed in one side, away from the push rod, of each positioning block, the semicircular grooves of the two positioning blocks are used for being matched with each other to enable the two half molding pipes to be mutually abutted and combined through the two half molding pipes of the clamp, and the two cross rods are used for synchronously abutting against the two overturning plates to overturn oppositely.

In one embodiment, the projection of the strip-shaped through groove on the substrate is a straight line segment, the extending direction of the straight line segment is parallel to the length direction of the substrate, and the strip-shaped through groove extends from the top edge of the turnover plate to the bottom edge of the turnover plate.

In one embodiment, the top of the forming half pipe is protruded with a semi-circular cone part, the semi-circular cone parts of the two forming half pipes form a conical part together, and the inner diameter of the conical part is gradually increased along the vertical upward direction.

In one embodiment, the pressing mechanism comprises a longitudinal guide rail and a pressing assembly, the longitudinal guide rail is convexly arranged in the middle of the base plate and is positioned between the two turnover plates, and the pressing assembly is arranged on the longitudinal guide rail.

In one embodiment, a longitudinal guide groove is formed in the longitudinal guide rail, the pressing assembly comprises a mounting plate, a rotating motor and a threaded part, the mounting plate is fixed to the top end of the longitudinal guide rail, the rotating motor is mounted on the mounting plate, a lead screw is fixed to an output shaft of the rotating motor, the threaded part is screwed on the lead screw, the threaded part comprises a disc and a guide pillar, the disc is sleeved on the lead screw in a screwed mode, the guide pillar is convexly arranged at one end of the disc and inserted into the longitudinal guide groove, and the cross section of the guide pillar is rectangular.

A corrugated pipe is formed by rolling the corrugated pipe forming system.

When the corrugated pipe forming system is used, the circular pipe is firstly installed on the pressing mechanism, and the pressing mechanism drives the circular pipe to be pressed into the space between the two forming half pipes. Then, the two transverse pressing assemblies drive the two half forming pipes to abut against each other and form an outer pipe die, and then the outer pipe die is used for pressing and holding the round pipe to form the corrugated pipe. After the bellows shaping, two horizontal pressure subassemblies release two shaping half pipes, and two shaping half pipes keep away from each other under the effect of two first torsional springs and break away from the bellows to make the bellows take out comparatively easily, improved the convenience of getting the material operation.

Drawings

Fig. 1 is a perspective view of a substrate and a tube assembly according to an embodiment.

FIG. 2 is a perspective view of a bellows forming system with a tubular assembly removed according to one embodiment.

FIG. 3 is a perspective view of another perspective of the bellows forming system shown in FIG. 2.

Fig. 4 is a perspective view of the bellows forming system of fig. 2 with the hold-down mechanism removed.

FIG. 5 is a diagram illustrating the fitting relationship between the inner tube mold, the corrugated tube, and the outer tube mold according to an embodiment.

FIG. 6 is a schematic view of a friction disk, a ring cylinder and a die strip of an embodiment.

Detailed Description

The invention relates to a corrugated pipe forming system and a formed corrugated pipe thereof. For example, the bellows forming system includes a mounting assembly, a tubular assembly, two cross-press assemblies, and a hold-down mechanism. For example, the mounting assembly includes a base plate, two L-shaped frames and two turnover plates, the two L-shaped frames are respectively protruded from two opposite ends of the base plate, and the two turnover plates are respectively rotatably mounted on two opposite ends of the base plate. For example, the strip-shaped through groove is formed in the turnover plate, the tubular assembly comprises two forming half pipes and two fixing shafts, and the two forming half pipes are supported on the base plate. For example, two fixing shafts are fixed to the middle of the base plate at intervals, the bottom ends of the two molding half pipes are connected to the two fixing shafts through first torsion springs, respectively, and the two first torsion springs are used for enabling the two molding half pipes to rotate to be away from each other. For example, two transverse pressing assemblies are respectively mounted on two L-shaped frames, and a pressing mechanism is mounted on the base plate and used for driving the circular tube to move downwards between the two half-shaped forming tubes. For example, the two transverse pressing assemblies are used for driving the two half-pipes to abut against each other and form an outer pipe die, and the outer pipe die is used for pressing and holding a round pipe to form the corrugated pipe.

Referring to fig. 1 to 4, a corrugated pipe forming system includes a mounting assembly 10, a tubular assembly 20, two transverse pressing assemblies 30 and a pressing mechanism 40, the mounting assembly 10 includes a base plate 11, two L-shaped frames 12 and two turning plates 13, the two L-shaped frames 12 are respectively protruded at opposite ends of the base plate 11, the two turning plates 13 are respectively rotatably mounted at opposite ends of the base plate 11, the turning plates 13 are provided with strip-shaped through slots 135, the tubular assembly 20 includes two forming half pipes 21 and two fixing shafts 22, the two forming half pipes 21 are both supported on the base plate 11, the two fixing shafts 22 are fixed at intervals to the middle of the base plate 11, the bottom ends of the two forming half pipes 21 are respectively connected to the two fixing shafts 22 through first torsion springs for rotating the two forming half pipes 21 to be away from each other, the two transverse pressing assemblies 30 are respectively mounted on the two L-shaped frames 12, the pressing mechanism 40 is installed on the substrate 11 and is used for driving the circular tube to move down between the two half-tubes 21, the two transverse pressing assemblies 30 are used for driving the two half-tubes 21 to abut against each other and form the outer tube mold 201, and the outer tube mold 201 is used for pressing and holding the circular tube to form the corrugated tube 205.

When the corrugated pipe forming system is used, the circular pipe is firstly installed on the pressing mechanism 40, and the pressing mechanism 40 drives the circular pipe to be pressed into the space between the two forming half pipes 21. Then, the two cross press assemblies 30 drive the two molding half pipes 21 against each other and form the outer pipe mold 201, and thereafter press the circular pipe with the outer pipe mold 201 to form the corrugated pipe 205. After the corrugated pipe 205 is formed, the two transverse pressing assemblies 30 release the two forming half pipes 21, and the two forming half pipes 21 are away from the corrugated pipe 205 under the action of the two first torsion springs, so that the corrugated pipe 205 can be taken out easily, and the convenience of material taking operation is improved.

For example, in order to facilitate the lateral holding of the two formed half-tubes 21, the bottom ends of the flipping plates 13 are connected to the ends of the base plate 11 by second torsion springs for automatically flipping the two flipping plates 13 away from each other. The transverse pressing assembly 30 comprises a transverse pressing cylinder 31, a push rod 32, a cross rod 33 and a positioning block 34, the transverse pressing cylinder 31 is installed on the L-shaped frame 12, the push rod 32 is coaxially fixed on an output shaft of the transverse pressing cylinder 31 and movably penetrates through a strip-shaped through groove 135 of the turnover plate 13, the middle part of the cross rod 33 is vertically fixed on the push rod 32 and abuts against the turnover plate 13, and the positioning block 34 is fixed at the end part of the push rod 32. The cross bar 33 is a cylindrical bar and abuts against one side of the turnover plate 13, which is far away from the positioning block 34, the positioning block 34 is rectangular block-shaped, and the two positioning blocks 34 are respectively positioned above the two fixing shafts 22. The positioning blocks 34 are formed with semi-circular grooves 345 at a side away from the push rod 32, and the semi-circular grooves 345 of the two positioning blocks 34 are used for cooperating with each other to clamp the two molding half pipes 21 so that the two molding half pipes 21 are abutted against each other and combined. Through setting up push rod 32, and then conveniently utilize two push rod 32 drive two locating pieces 34 to remove, utilize two half shaping pipes 21 of half slot 345 clamps of locating piece 34, form outer tube mould 201 then.

For example, in order to facilitate the two transverse pressing assemblies 30 to make the two turnover plates 13 approach each other during the forming process, the two transverse bars 33 are used for synchronously abutting against the two turnover plates 13 to turn over towards each other. The projection of the strip-shaped through groove 135 on the substrate 11 is a straight line segment, the extending direction of the straight line segment is parallel to the length direction of the substrate 11, and the strip-shaped through groove 135 extends from the top edge of the turnover plate 13 to the bottom edge of the turnover plate 13. Through setting up the through groove 135 of bar, make things convenient for the activity of push rod 32 then and promote locating piece 34 and remove to make things convenient for the upset of returning face plate 13, also can not interfere with push rod 32 each other when making the upset of returning face plate 13. The arrangement of the cross bar 33 is convenient for simultaneously driving the two turnover plates 13 to turn over towards each other. For example, the round tube is in a state before the bellows 205 is molded.

For example, in order to facilitate the pushing of the round pipe to descend between the two molding half pipes 21, the top of the molding half pipe 21 is protruded upward with a semi-conical portion, the semi-conical portions of the two molding half pipes 21 together form a conical portion 211, and the inner diameter of the conical portion 211 is gradually increased in a vertically upward direction. The pressing mechanism 40 includes a longitudinal rail 41 and a pressing assembly 43, the longitudinal rail 41 is disposed in the middle of the base plate 11 and located between the two turnover plates 13, and the pressing assembly 43 is mounted on the longitudinal rail 41. The longitudinal guide rail 41 is provided with a longitudinal guide groove 415, the pressing assembly 43 comprises a mounting plate 431, a rotating motor 433 and a screw 435, the mounting plate 431 is fixed at the top end of the longitudinal guide rail 41, the rotating motor 433 is mounted on the mounting plate 431, a screw 434 is fixed on an output shaft of the rotating motor 433, and the screw 435 is screwed on the screw 434. The screw 435 includes a disc 436 and a guide post 437, and the disc 436 is screwed on the screw 434. The guide post 437 is disposed at one end of the disk 436 and inserted into the longitudinal guide groove 415. For example, in another implementation, the guide posts 437 are rectangular in cross-section. Through setting up rotating electrical machines 433, can utilize rotating electrical machines 433 to drive lead screw 434 rotatory to drive screw 435 and move down, finally extrude the pipe downwards in outer tube mould 201, the entering of pipe is made things convenient for in the setting up of circular cone portion 211.

For example, the present invention also provides a bellows 205, the bellows 205 being rolled from a wave tube forming system as described above.

For example, and with particular reference to FIG. 5, a guide slot is formed in one side of the disk and the longitudinal rail is slidably engaged within the guide slot. The lead screw 434 extends in the vertical direction and is inserted between the two half molding tubes 21, the bottom end of the lead screw 434 and the substrate 11 are arranged at intervals, and the distance between the bottom end of the lead screw 434 and the substrate is greater than the length of the circular tube. The outer tube die 201 comprises a plurality of sequentially connected annular segments, and an embedded ring 202 is arranged in each annular segment in a protruding mode. In order to position the round pipe, the pressing mechanism 40 further includes a forming assembly 45, the forming assembly 45 includes an inner pipe mold 451, a friction disc 452, a sleeve 453 and two support blocks 454, a plurality of convex ring portions 4518 are convexly arranged on the periphery of the inner pipe mold 451, and a concave ring groove 4516 is formed between two adjacent convex ring portions 4518. The upper and lower peripheries of the collar 4518 are formed with rounded corners. The friction disk 452 is fixed to the top of the inner pipe mold 451, the sleeve 453 is protruded at the center of the friction disk 452 and extends upward, and the top end of the sleeve 453 is fixed to the bottom center of the disk 436 of the screw 435. The lead screw 434 is inserted into the circular tube, the friction disc 452 and the inner tube mold 451. The two support blocks 454 are fixed to the upper ends of the two flipping plates 13, respectively. A groove is formed on one side of each supporting block 454, which faces away from the transverse air cylinder 31, and the grooves of the two supporting blocks 454 are communicated with each other to merge into a circular groove 455, through which the screw rod 434 passes. The diameter of the circular groove 455 is equal to the diameter of the circular tube. A half-ring mark surface 4545 is formed on the upper surface of the support block 454. For example, the sum of the two times of the thickness of the circular pipe and the thickness of the inner embedded ring 202 is smaller than the width of the concave ring groove 4516, that is, after the inner embedded ring 202 extrudes the pipe wall of the circular pipe into the concave ring groove 4516, the thickness of the inner embedded ring 202 and the pipe wall of the circular pipe deformed at the upper and lower sides thereof is added up and is smaller than the width of the concave ring groove 4516, so that the inner pipe mold 451 can reciprocate up and down at a short distance relative to the appearance mold without affecting the up and down shaking of the outer pipe mold 201.

For example, in a specific forming process, the circular tube is sleeved on the screw 434 from the lower end and moved upward above the two turnover plates 13, and the inner tube mold 451 is located above the supporting block 454. The two lateral pressing assemblies 30 are used for driving the two turning plates 13 to approach each other so that the two supporting blocks 454 are abutted against each other to be sleeved on the screw rod 434, and the half-ring marking surfaces 4545 of the two supporting blocks 454 together form a circular ring marking surface so as to support and position the bottom end of the circular tube (i.e. release the circular tube so that the circular tube is supported on the circular ring marking surface). The rotating motor 433 is used for driving the screw 434 to rotate so as to force the screw 435 to drive the inner tube mold 451 to move downwards, so that the inner tube mold 451 enters the circular tube to fix the circular tube (i.e., the outer surface of the inner tube mold 451 outwards abuts against the inner wall of the circular tube, so that the circular tube is sleeved and fixed on the inner tube mold 451), until the bottom surface of the friction disc 452 abuts against the top end of the circular tube, and the bottom end of the inner tube mold 451 is higher than the height of the circular ring mark surface. Thereafter, the two cross press assemblies 30 release the two roll-over panels 13 and the two formed half-tubes 21. The rotating motor 433 is further configured to drive the screw 434 to rotate, so as to force the screw 435 to drive the circular tube to enter between the two forming half-tubes 21 until the bottom end of the circular tube abuts against the substrate 11. The two lateral pressing assemblies 30 are used for driving the two positioning blocks 34 to move towards each other, and the two molding half tubes 21 are combined to press against the circular tube by using the plurality of pressing rings, so that the wall of the circular tube is squeezed into the plurality of concave ring grooves 4516 of the inner tube mold 451 to form the corrugated tube 205, wherein the corrugated tube 205 includes a plurality of tube segments 2055. The friction disc 452 has now moved under the two support blocks 454, and at the same time the two support blocks 454 are adapted to abut against each other and fit over the sleeve 453.

For example, the rotary motor 433 is further configured to rotate reciprocally to reciprocate the inner pipe mold 451 longitudinally (i.e., to move reciprocally up and down with a small stroke, the friction disc 452 does not hit the two support blocks 454, the stroke is a distance of 1-3 mm), so as to press the joint sections of the corrugated pipe 205 up and down by the plurality of collar portions 4518 of the inner pipe mold 451, respectively, to force the upper and lower sides of each joint section to become smooth under the pressing, thereby making the joint sections of the corrugated pipe 205 more fit the shape of the outer pipe mold 201. Specifically, because the bottom end of the inner tube mold 451 is located higher than the height of the circular ring mark surface when the circular tube is sleeved, i.e., the bottom end of the circular tube protrudes below the bottom end of the inner tube mold 451, the substrate 11 can be pressed against the bottom end of the circular tube by the continuous rotation of the rotating motor 433, and the longitudinal reciprocation of the inner tube mold 451 enables the overall length of the bellows 205 to be shortened between the friction disc 452 and the rigid clamping of the substrate 11, so as to assist the shape change of the plurality of joint sections.

In use, it is convenient to position the circular tube on the base plate 11, so that the two transverse pressing assemblies 30 drive the two formed half-tubes 21 to transversely press the circular tube, thereby forming the corrugated tube 205. The reciprocating rotation of the rotary motor 433 makes the inner pipe mold 451 move reciprocally within a preset stroke range to respectively press against the joint sections of the bellows 205, so as to fully press against the corners of the bellows 205, so that the upper and lower sides of the joint sections are respectively smoothed, and the dimension of the joint sections along the axial direction is increased, that is, the molding quality of the bellows 205 is improved. And because the pipe has already supported on base plate 11, the drive screw 435 of rotating electrical machines 433 continues to descend and rise, and it can apply force in the bottom of pipe to force the pipe to shorten, so that the material of pipe can more conveniently take place horizontal size change, the change of the supplementary a plurality of joint sections, because the change of the horizontal size of joint section can make the length of pipe shorten. The sum of the two times of the thickness of the circular tubes and the embedded ring 202 is smaller than the width of the concave ring groove 4516, that is, after the embedded ring 202 is extruded into the concave ring groove 4516, the thickness of the internal ring 202 and the thicknesses of the pipe walls of the circular tubes on the upper side and the lower side of the internal ring 202 are added up, or the sum is smaller than the width of the concave ring groove 4516, so that the internal ring 451 can reciprocate up and down at a short distance without affecting the external pipe mold 201, and therefore, the internal ring 202 extrudes the circular tubes inwards into the concave ring groove 4516, and a part of room can be left for the internal pipe mold 451 to move up and down, so that more detailed forging work can be performed by applying force, so as to forge the joint section of the corrugated pipe 205, so that the corner of the joint section of the corrugated pipe 205 is more fitted to the corner of the embedded ring of the embedded pipe 201.

For example, referring to fig. 6, in order to facilitate the release of the bellows 205 from the inner pipe mold 451, the bottom of the friction disc 452 is provided with an annular cylinder 46, the annular cylinder 46 is disposed around the lead screw 434, the annular cylinder 46 has a plurality of output shafts extending in a radial direction of the friction disc 452, and a plurality of mold bars 4511 are wound around to form the inner pipe mold 451. The top ends of the plurality of mold bars 4511 are vertically connected to the end portions of the plurality of output shafts, respectively, and extend in the vertical direction. A space 4519 is formed between every adjacent two of the die strips 4511 of the inner tube die 451. When the bellows 205 needs to be removed, the annular cylinder 46 brings the plurality of mold strips 4511 to contract inward in the radial direction of the friction disc 452, so that the outer diameter of the inner tube mold 451 is reduced, and the bellows 205 can be easily released from the inner tube mold 451. Due to the continuity of the metal material of the round tube and the small space 4519 between two adjacent mold strips 4511, the space 4519 between two adjacent mold strips 4511 does not have a large influence on the corrugated tube 205 when the corrugated tube 205 is molded.

For example, the inner pipe mold is also made of a deformable metal material, on which a plurality of hard grinding blocks are arranged, the top of which is connected with a water pumping pipe, and the plurality of hard grinding blocks constitute a plurality of grinding rings. The pump water pipe is externally connected with a pressure water pump. The pressure water pump can make its bulging outwards press and hold the pipe with preliminary shaping bellows to reciprocate under the drive of revolving cylinder and lead screw and utilize a plurality of rings of polishing forging and pressing and the pipe of meticulous polishing. When the material is taken, water can be discharged to enable the material to shrink.

Claims

1. A corrugated pipe forming system is characterized by comprising a mounting assembly, a tubular assembly, two transverse pressing assemblies and a pressing mechanism, wherein the mounting assembly comprises a base plate, two L-shaped frames and two turnover plates, the two L-shaped frames are respectively convexly arranged at two opposite ends of the base plate, the two turnover plates are respectively rotatably arranged at two opposite ends of the base plate, strip-shaped through grooves are formed in the turnover plates, the tubular assembly comprises two forming half pipes and two fixed shafts, the two forming half pipes are supported on the base plate, the two fixed shafts are mutually fixed in the middle of the base plate at intervals, the bottom ends of the two forming half pipes are respectively connected to the two fixed shafts through first torsion springs, the two first torsion springs are used for enabling the two forming half pipes to rotate to be away from each other, the two transverse pressing assemblies are respectively arranged on the two L-shaped frames, the pressing mechanism is arranged on the base plate and is used for driving a circular pipe, the two transverse pressing assemblies are used for driving the two forming half pipes to mutually abut and combine to form an outer pipe die, and the outer pipe die is used for pressing and holding the round pipe to form the corrugated pipe.

2. The bellows molding system of claim 1 wherein the bottom end of the roll-over plate is connected to the end of the base plate by a second torsion spring, the two second torsion springs for automatically rolling the two roll-over plates away from each other.

3. The bellows forming system of claim 2, wherein the cross press assembly comprises a cross press cylinder, a push rod, a cross rod, and a positioning block, the cross press cylinder is mounted on the L-shaped frame, the push rod is coaxially fixed to an output shaft of the cross press cylinder and movably disposed in the strip-shaped through groove of the roll-over plate, a middle portion of the cross rod is vertically fixed to the push rod and abuts against the roll-over plate, and the positioning block is fixed to an end portion of the push rod.

4. The bellows forming system of claim 3, wherein the cross bar is a cylindrical bar and abuts against a side of the roll-over plate facing away from the positioning blocks, the positioning blocks are rectangular blocks, and the two positioning blocks are respectively located above the two fixed shafts.

5. The bellows forming system of claim 4, wherein the positioning block has a semi-circular groove formed on a side thereof facing away from the push rod, the semi-circular grooves of the two positioning blocks are adapted to cooperate with each other to clamp the two formed half pipes so that the two formed half pipes abut against each other and are combined, and the two cross bars are adapted to synchronously abut against the two flipping plates to flip in opposite directions.

6. The bellows forming system of claim 5, wherein the projection of the strip channel onto the base plate is a straight line segment extending parallel to a length of the base plate, the strip channel extending from a top edge of the roll-over plate to a bottom edge of the roll-over plate.

7. The bellows forming system of claim 6, wherein the top of the forming half pipe has a tapered portion projecting upward, and the tapered portions of the two forming half pipes together form a tapered portion having an inner diameter that increases in a vertically upward direction.

8. The bellows forming system of claim 7, wherein the hold-down mechanism comprises a longitudinal rail and a hold-down assembly, the longitudinal rail is disposed at a middle portion of the base plate and between the two roll-over plates, and the hold-down assembly is mounted on the longitudinal rail.

9. A corrugated pipe forming system as claimed in claim 8, wherein the longitudinal guide rail has a longitudinal guide groove formed therein, the hold-down assembly includes a mounting plate, a rotating motor and a screw member, the mounting plate is fixed to a top end of the longitudinal guide rail, the rotating motor is mounted on the mounting plate, a lead screw is fixed to an output shaft of the rotating motor, the screw member is screwed onto the lead screw, the screw member includes a disc and a guide post, the disc is fitted over the lead screw, the guide post is protruded from one end of the disc and inserted into the longitudinal guide groove, and a cross section of the guide post is rectangular.

10. A corrugated tube rolled from the tube-forming system of claim 9.