Eccentric non-uniform wall thickness PVC conveying pipe flaring equipment and method thereof

Abstract

The invention discloses an eccentric non-uniform wall thickness PVC conveying pipe flaring method which is applied to eccentric non-uniform wall thickness PVC conveying pipe flaring equipment which comprises a base plate, a heating device is fixedly installed on the rear side of the top of the base plate, and an adjustable flaring assembly located on the right side of the heating device is arranged on the rear side of the top of the base plate. The adjustable flaring assembly comprises a vertical plate fixedly connected with the base plate. According to the flaring device, the frustum rod is operated to move forwards through the propelling assembly, so that the frustum rod is matched with the inner wall of the arc-shaped groove, the four flaring blocks expand outwards, the expanding distance is increased along with forward movement of the frustum rod, the frustum rod moves backwards, the four flaring blocks move in opposite directions through the spring, and the flaring requirements of various specifications can be met; and through cooperation of the rotating roller bearing platform, the moving assembly and the centering clamp, the PVC conveying pipe can be automatically switched back and forth between the heating device and the adjustable flaring assembly, and manpower input is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of conveying pipe expansion, and in particular relates to an eccentric and uneven wall thickness PVC conveying pipe expansion device and a method thereof. Background Art

[0002] Eccentric structure of PVC conveying pipe: The wall thickness of the pipe is not evenly distributed in the cross section, showing an eccentric characteristic. This eccentric structure may be caused by the production process, design requirements or special application needs. Uneven wall thickness of PVC conveying pipe: Compared with traditional uniform wall thickness pipes, the wall thickness of eccentric uneven wall thickness PVC conveying pipe varies in different parts. This uneven wall thickness distribution may be to meet specific mechanical performance requirements, adapt to different pressure conditions or achieve specific functions.

[0003] The expansion of eccentric uneven wall thickness PVC conveying pipe is the same as the expansion of ordinary PVC conveying pipe. Generally, the end of the PVC conveying pipe is heated and softened, and then put on the expansion mold to realize the expansion operation. The size of the expansion mold is generally fixed. The change of the expansion size requires the replacement of the mold, which is inconvenient. Moreover, the overall operation requires manual movement of the PVC pipe, and the degree of automation is low. Therefore, we designed an eccentric uneven wall thickness PVC conveying pipe expansion equipment and method. The expansion mold with adjustable size can be applied to expansion of various specifications, without the need to frequently replace the expansion mold, and no human intervention is required to transfer from the heating station to the expansion station. The degree of automation is high, which improves the convenience of operation. Summary of the invention

[0004] The purpose of the present invention is to provide an eccentric and uneven wall thickness PVC conveying pipe expanding device and method, which adopts a size-adjustable expanding mold that can be suitable for expanding of various specifications, does not need to frequently replace the expanding mold, and does not require human intervention when transferring from the heating station to the expanding station. It has a high degree of automation and improves the advantages of convenient operation to solve the above-mentioned background technical problems.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: a method for expanding an eccentric PVC conveying pipe with uneven wall thickness, which is applied to an eccentric PVC conveying pipe with uneven wall thickness expanding equipment, the expanding equipment comprising a base plate: a heating device is fixedly installed on the rear side of the top of the base plate, and an adjustable expanding component located on the right side of the heating device is arranged on the rear side of the top of the base plate, and the adjustable expanding component comprises a vertical plate fixedly connected to the base plate, a rotatable hollow rotating tube is penetrated through one side of the vertical plate, a rotating disk is fixedly connected to the front side of the hollow rotating tube, and four rectangular grooves are provided in an annular array on the front side of the rotating disk, and a slider is slidably connected to the inner cavity of the rectangular groove, and a expanding block is fixedly connected to the front side of the slider, and an arc groove is provided on the inner side of the expanding block. The inner cavity of the rotating tube is slidably connected with a frustum rod adapted to the arc groove, the rear side of the vertical plate is provided with a support platform fixedly connected to the base plate, a propulsion assembly is provided between the support platform and the frustum rod, a rotating assembly is provided between the hollow rotating tube and the base plate, a centering clamp is provided in the middle of the top of the base plate, and the centering clamp includes a fixed shell, the inner cavity annular array of the fixed shell is provided with four square grooves, the inner cavity of the square groove is slidably connected with a square slider, one end of the square slider extends to the inner cavity of the fixed shell and is fixedly connected with a clamping block, a driving assembly is provided between the square slider and the fixed shell, a moving assembly is provided between the fixed shell and the base plate, the moving assembly includes a side shift assembly and a front and rear shift assembly, and a roller bearing platform is installed on the front side of the top of the base plate;

[0006] A method for expanding an eccentric and uneven wall thickness PVC conveying pipe, the method for expanding the PVC conveying pipe is as follows:

[0007] Step 1: Place the PVC conveying pipe on the roller support platform so that the expanded end passes through the fixed shell, then the motor 3 drives the gear 1 to rotate, and the gear 1 drives the gear 2 and the rotating ring 2 to rotate, so that the sliding pin slides in the inner cavity of the wedge-shaped groove, and then the inner cavities of the four sliding pins slide toward each other, thereby making the four square sliders slide toward each other in the inner cavity of the square groove, so that the four clamping blocks are clamped on the surface of the PVC conveying pipe to fix the PVC conveying pipe, and then the forward and backward moving components make the centering clamp and the clamped PVC conveying pipe move backward, so that the end of the PVC conveying pipe extends into the inner cavity of the heating device for heating and softening;

[0008] Step 2: After the end of the PVC delivery pipe is heated to a temperature at which the pipe can be expanded, the forward and backward moving assembly moves the centering fixture and the clamped PVC delivery pipe forward, so that the end of the PVC delivery pipe is separated from the inner cavity of the heating device. Then, the side moving assembly drives the forward and backward moving assembly, the centering fixture and the PVC delivery pipe to move, so that the PVC delivery pipe faces the adjustable expansion assembly. Then, the forward and backward moving assembly moves the centering fixture and the clamped PVC delivery pipe backward, so that the expanded end is sleeved on the surfaces of the four expansion blocks.

[0009] Step 3: Then, the motor 2 drives the hollow rotating tube and the rotating disk to rotate through the pulley 1, the pulley 2 and the belt, and the rotating disk drives the flaring block to rotate through the slider. During this period, the motor 1 is started, and the threaded sleeve is driven to rotate under the cooperation of the bevel gear 1 and the bevel gear 2. The thread causes the threaded rod to move forward under the cooperation of the guide convex strip and the guide groove, and the threaded rod drives the frustum rod to slide forward in the inner cavity of the four arc grooves. The frustum rod slides forward in the inner cavity of the arc groove, which causes the four flaring blocks to move in opposite directions to flare the PVC conveying pipe. During the movement of the flaring block, the slider is driven to slide on the surface of the limit rod and squeeze the spring. During this period, the flaring block is still in a rotating state, making the flaring of the end of the PVC conveying pipe more rounded. The more the frustum rod moves forward, the greater the distance between the four flaring blocks is, and the flaring of conveying pipes of various calibers can be realized;

[0010] Step 4: After the expansion is completed, the second motor stops working, and then the first motor reverses, so that the threaded rod drives the annular limit groove to move backward, and the thrust on the expansion block is slowly cancelled. The restoring force of the four springs makes the four sliders slide toward each other on the surfaces of the four limit rods, and the four expansion blocks move toward each other, canceling the internal support of the PVC conveying pipe. Then the forward and backward moving components work to drive the centering clamp and the expanded PVC conveying pipe to separate from the surface of the expansion block, and then the third motor reverses, so that the four square sliders and the clamping block move back to each other, canceling the clamping of the PVC conveying pipe, and the user can pull out the expanded PVC conveying pipe;

[0011] It should be noted that the PVC conveying pipe is placed on the top of the roller support platform, and there will be no obstruction during the movement, which reduces the friction of the PVC conveying pipe when moving.

[0012] Preferably, the propulsion assembly includes a fixed plate fixedly connected to the top of the support platform, a fixed seat is fixedly installed on the rear side of the fixed plate, the inner cavity of the fixed seat is rotatably connected to a threaded sleeve, the inner cavity of the threaded sleeve is threadedly connected to a threaded rod, and the front end of the threaded rod is fixedly connected to the cone rod.

[0013] Preferably, a bevel gear 2 is fixedly connected to the surface of the threaded sleeve, a motor 1 is fixedly installed on the top of the support platform, a bevel gear 1 is fixedly installed on the output shaft of the motor 1, and the bevel gear 1 is meshed with the bevel gear 2.

[0014] Preferably, an annular limiting groove is provided on the rear side of the fixing seat, and a rotating ring 1 which rotates in the inner cavity of the annular limiting groove is fixedly connected to the surface of the threaded sleeve.

[0015] Preferably, both sides of the inner cavity of the fixing seat are fixedly connected with guide convex strips, and both sides of the surface of the threaded rod are provided with guide grooves for the guide convex strips to slide.

[0016] Preferably, the rotating assembly includes a second motor fixedly mounted on the top of the base plate, a first pulley is fixedly mounted on the output shaft of the second motor, a second pulley is fixedly connected to the surface of the hollow rotating tube, and the first pulley is connected to the second pulley via a belt drive.

[0017] Preferably, the driving assembly includes a sliding pin fixedly connected to the front side of the square slider, a sliding groove for the sliding pin to slide is provided on one side of the inner cavity of the square groove, a rotating ring 2 is rotatably connected to the front side of the fixed shell, four wedge-shaped grooves are provided on the front side of the rotating ring 2, and the front end of the sliding pin extends to the inner cavity of the wedge-shaped groove and is slidably connected to the wedge-shaped groove.

[0018] Preferably, the surface of the rotating ring 2 is fixedly connected with a gear 2, the right side of the fixed shell is fixedly installed with a motor 3, the output shaft of the motor 3 is fixedly connected with a gear 1, and the gear 1 is meshed with the gear 2.

[0019] Preferably, the front-rear moving assembly is mounted on the moving end of the side-moving assembly, and the fixed shell is fixedly mounted on the moving end of the front-rear moving assembly.

[0020] Preferably, the inner cavity of the rectangular groove is fixedly connected to a limit rod, the surface of the limit rod is sleeved with a spring, the slider is slidably connected to the surface of the limit rod, and the two ends of the spring are respectively fixedly connected to the slider and the inner wall of the rectangular groove.

[0021] The beneficial effects of the present invention are:

[0022] 1. The present invention operates the cone rod to move forward by pushing the assembly, so that the cone rod cooperates with the inner wall of the arc groove, so that the four expansion blocks expand outward, and the expansion distance increases as the cone rod moves forward. The cone rod moves backward, and the spring causes the four expansion blocks to move toward each other, so that the expansion requirements of various specifications can be met. The cooperation of the roller support, the moving assembly and the centering clamp can make the PVC conveying pipe automatically switch back and forth between the heating device and the adjustable expansion assembly, reducing manpower input, so that the expansion mold with adjustable size can be used for expansion of various specifications, without the need to frequently replace the expansion mold, and no human intervention is required to transfer from the heating station to the expansion station, with a high degree of automation, and the purpose of improving the convenience of operation;

[0023] 2. The present invention uses the guide ribs and the guide grooves in coordination. During the rotation of the threaded sleeve, the threaded rod will slide in the inner cavity of the guide ribs due to the limit sliding of the guide grooves. The threaded rod will move stably, ensuring that the threaded rod will not rotate along with the rotation of the threaded sleeve, thereby improving the stability of the movement of the threaded rod.

[0024] 3. The present invention can guide the movement of the slider by setting the limit rod, and also prevent the slider from leaving the inner cavity of the rectangular groove, thereby improving the stability and reliability of the movement of the slider.

[0025] 4. The present invention can simultaneously control the four clamping blocks to move toward and away from each other through the setting of the centering clamp, so that the PVC delivery pipe can be clamped in the center of the inner cavity of the fixed shell, ensuring that the PVC pipe is aligned with the heating device and the adjustable expansion assembly, and that forces are applied in four directions, ensuring that the PVC delivery pipe is deformed. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or other advantages of the present invention will become clearer and easier to understand through the detailed description made in conjunction with the following drawings, which are only exemplary and do not limit the present invention, wherein:

[0027] Figure 1 A three-dimensional schematic diagram of an embodiment of the present invention;

[0028] Figure 2 A three-dimensional disassembly schematic diagram of an embodiment of the present invention;

[0029] Figure 3 It is a three-dimensional schematic diagram of an adjustable flaring assembly according to an embodiment of the present invention;

[0030] Figure 4 A rear perspective schematic diagram of an adjustable flaring assembly according to an embodiment of the present invention;

[0031] Figure 5 It is a three-dimensional schematic diagram of a frustum rod and a propulsion assembly according to an embodiment of the present invention;

[0032] Figure 6 It is a three-dimensional exploded schematic diagram of a fixing seat, a threaded sleeve and a threaded rod according to an embodiment of the present invention;

[0033] Figure 7 It is a three-dimensional disassembled schematic diagram of a centering clamp according to an embodiment of the present invention.

[0034] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0035] 1. Base plate, 2. Heating device, 3. Adjustable flaring assembly, 31. Vertical plate, 32. Hollow rotating tube, 33. Rotating disk, 34. Rectangular groove, 35. Sliding block, 36. Flaring block, 37. Arc groove, 38. Cone rod, 39. Propelling assembly, 391. Fixed plate, 392. Fixed seat, 393. Threaded sleeve, 394. Threaded rod, 395. Motor 1, 396. Bevel gear 1, 397. Bevel gear 2, 398. Annular limit groove, 399. Rotating ring 1, 3910. Guide rib, 3911. Guide groove, 310. Support table , 311, rotating component, 3111, motor two, 3112, pulley one, 3113, pulley two, 3114, belt, 312, limit rod, 313, spring, 4, centering fixture, 41, fixed shell, 42, square groove, 43, square slider, 44, clamping block, 45, driving component, 451, sliding pin, 452, sliding groove, 453, rotating ring two, 454, wedge groove, 455, motor three, 456, gear one, 457, gear two, 5, moving component, 51, side shift component, 52, front and rear shift component, 6, roller support. DETAILED DESCRIPTION

[0036] Hereinafter, embodiments of the eccentric non-uniform wall thickness PVC conveying pipe expanding device and method thereof of the present invention will be described with reference to the accompanying drawings.

[0037] The embodiments described herein are specific embodiments of the present invention, which are used to illustrate the concept of the present invention, are illustrative and exemplary, and should not be construed as limiting the embodiments of the present invention and the scope of the present invention. In addition to the embodiments described herein, those skilled in the art can also adopt other obvious technical solutions based on the claims and the contents disclosed in the specification of this application, including technical solutions that adopt any obvious replacement and modification of the embodiments described herein.

[0038] The drawings of this specification are schematic diagrams, which assist in explaining the concept of the present invention and schematically show the shapes of various parts and their mutual relationships. Please note that in order to clearly show the structures of various components of the embodiments of the present invention, the drawings are not drawn according to the same scale. The same reference numerals are used to represent the same parts.

[0039] Embodiment 1

[0040] Figure 1-7A method for expanding an eccentric uneven wall thickness PVC conveying pipe according to an embodiment of the present invention is shown, which is applied to an eccentric uneven wall thickness PVC conveying pipe expanding device, the expanding device comprising a base plate 1: a heating device 2 is fixedly installed on the rear side of the top of the base plate 1, an adjustable expanding component 3 located on the right side of the heating device 2 is arranged on the rear side of the top of the base plate 1, the adjustable expanding component 3 comprises a vertical plate 31 fixedly connected to the base plate 1, a rotatable hollow rotating pipe 32 is penetrated through one side of the vertical plate 31, a rotating disk 33 is fixedly connected to the front side of the hollow rotating pipe 32, and a front annular array of the rotating disk 33 Four rectangular grooves 34 are provided, and a slider 35 is slidably connected to the inner cavity of the rectangular groove 34. The inner cavity of the rectangular groove 34 is fixedly connected to a limit rod 312. A spring 313 is sleeved on the surface of the limit rod 312. The slider 35 is slidably connected to the surface of the limit rod 312. The two ends of the spring 313 are respectively fixedly connected to the slider 35 and the inner wall of the rectangular groove 34. The front side of the slider 35 is fixedly connected to a flaring block 36. An arc groove 37 is provided on the inner side of the flaring block 36. The inner cavity of the hollow rotating tube 32 is slidably connected to a frustum rod 38 adapted to the arc groove 37. The rear side of the vertical plate 31 is provided with a fixed connection with the base plate 1. The hollow rotating tube 32 is connected to the support platform 310, a propulsion assembly 39 is arranged between the support platform 310 and the cone rod 38, a rotating assembly 311 is arranged between the hollow rotating tube 32 and the base plate 1, the rotating assembly 311 includes a motor 2 3111 fixedly installed on the top of the base plate 1, the output shaft of the motor 2 3111 is fixedly installed with a pulley 1 3112, the surface of the hollow rotating tube 32 is fixedly connected with a pulley 2 3113, the pulley 1 3112 and the pulley 2 3113 are connected through a belt 3114, and a centering fixture 4 is arranged in the middle of the top of the base plate 1, and the centering fixture 4 includes a fixed shell 41, and the inner of the fixed shell 41 The cavity annular array is provided with four square grooves 42, the inner cavity of the square groove 42 is slidably connected with a square slider 43, one end of the square slider 43 extends to the inner cavity of the fixed shell 41 and is fixedly connected with a clamping block 44, a driving component 45 is arranged between the square slider 43 and the fixed shell 41, a moving component 5 is arranged between the fixed shell 41 and the base plate 1, the moving component 5 includes a side shift component 51 and a front and rear shift component 52, the front and rear shift component 52 is installed on the moving end of the side shift component 51, the fixed shell 41 is fixedly installed on the moving end of the front and rear shift component 52, and a roller bearing platform 6 is installed on the front side of the top of the base plate 1;

[0041] A method for expanding an eccentric and uneven wall thickness PVC conveying pipe, the method for expanding the PVC conveying pipe is as follows:

[0042] Step 1: Place the PVC conveying pipe on the roller support 6 so that the expanded end passes through the fixed shell 41, then the motor 3 455 drives the gear 1 456 to rotate, and the gear 1 456 drives the gear 2 457 and the rotating ring 2 453 to rotate, so that the sliding pin 451 slides in the inner cavity of the wedge groove 454, and at this time, the inner cavities of the four sliding pins 451 slide towards each other, and then the four square sliders 43 slide towards each other in the inner cavity of the square groove 42, so that the four clamping blocks 44 clamp on the surface of the PVC conveying pipe to fix the PVC conveying pipe, and then the forward and backward moving component 52 makes the centering clamp 4 and the clamped PVC conveying pipe move backward, so that the end of the PVC conveying pipe extends into the inner cavity of the heating device 2 for heating and softening;

[0043] Step 2: After the end of the PVC conveying pipe is heated to the temperature at which the pipe can be expanded, the front-back moving assembly 52 moves the centering fixture 4 and the clamped PVC conveying pipe forward, so that the end of the PVC conveying pipe is separated from the inner cavity of the heating device 2, and then the side moving assembly 51 drives the front-back moving assembly 52, the centering fixture 4 and the PVC conveying pipe to move, so that the PVC conveying pipe faces the adjustable expanding assembly 3, and then the front-back moving assembly 52 moves the centering fixture 4 and the clamped PVC conveying pipe backward, so that the expanded end is sleeved on the surface of the four expanding blocks 36;

[0044] Step 3: Then the motor 2 3111 drives the hollow rotating tube 32 and the rotating disk 33 to rotate through the pulley 1 3112, the pulley 2 3113 and the belt 3114, and the rotating disk 33 drives the flaring block 36 to rotate through the slider 35. During this period, the motor 1 395 is started, and the bevel gear 1 396 and the bevel gear 2 397 drive the threaded sleeve 393 to rotate. Due to the thread, the threaded rod 394 moves forward under the cooperation of the guide convex strip 3910 and the guide groove 3911, and the threaded rod 394 drives the cone rod 38 to rotate in four arcs. The inner cavity of the arc-shaped groove 37 slides forward, and the frustum rod 38 slides forward in the inner cavity of the arc-shaped groove 37, which causes the four expanding blocks 36 to move in opposite directions to expand the PVC delivery pipe. During the movement of the expanding block 36, the slider 35 is driven to slide on the surface of the limit rod 312 and squeeze the spring 313. During this period, the expanding block 36 is still in a rotating state, making the expanded part of the end of the PVC delivery pipe more rounded. The more the frustum rod 38 moves forward, the larger the distance between the four expanding blocks 36 is, and the expansion of delivery pipes of various calibers can be achieved;

[0045] Step 4: After the expansion is completed, the motor 2 3111 stops working, and then the motor 1 395 reverses, so that the threaded rod 394 drives the annular limit groove 398 to move backward, and the thrust on the expansion block 36 is slowly cancelled. The restoring force of the four springs 313 makes the four sliders 35 slide toward each other on the surfaces of the four limit rods 312, and the four expansion blocks 36 move toward each other, canceling the internal support of the PVC conveying pipe, and then the forward and backward moving assembly 52 works to drive the centering clamp 4 and the expanded PVC conveying pipe to separate from the surface of the expansion block 36, and then the motor 3 455 reverses, so that the four square sliders 43 and the clamping block 44 move back to each other, canceling the clamping of the PVC conveying pipe, and the user can pull out the expanded PVC conveying pipe;

[0046] It should be noted that the PVC conveying pipe is placed on the top of the roller support 6, and there will be no obstruction during the movement, thereby reducing the friction of the PVC conveying pipe when moving.

[0047] Embodiment 2

[0048] The same as the first embodiment, further, the propulsion assembly 39 includes a fixed plate 391 fixedly connected to the top of the support platform 310, a fixed seat 392 is fixedly installed on the rear side of the fixed plate 391, a threaded sleeve 393 is rotatably connected to the inner cavity of the fixed seat 392, a threaded rod 394 is threadedly connected to the inner cavity of the threaded sleeve 393, the front end of the threaded rod 394 is fixedly connected to the cone rod 38, a bevel gear 397 is fixedly connected to the surface of the threaded sleeve 393, and an electric Machine 1 395, the output shaft of motor 1 395 is fixedly installed with bevel gear 1 396, bevel gear 1 396 is meshed with bevel gear 2 397, an annular limiting groove 398 is provided on the rear side of the fixed seat 392, a rotating ring 1 399 rotating in the inner cavity of the annular limiting groove 398 is fixedly connected to the surface of the threaded sleeve 393, guide ridges 3910 are fixedly connected to both sides of the inner cavity of the fixed seat 392, and guide grooves 3911 for the guide ridges 3910 to slide are provided on both sides of the surface of the threaded rod 394.

[0049] Embodiment 3

[0050] Basically the same as the first embodiment, further: the driving assembly 45 includes a sliding pin 451 fixedly connected to the front side of the square slider 43, a sliding groove 452 for sliding the sliding pin 451 is provided on one side of the inner cavity of the square groove 42, a rotating ring 2 453 is rotatably connected to the front side of the fixed shell 41, and four wedge-shaped grooves 454 are provided on the front side of the rotating ring 2 453, the front end of the sliding pin 451 extends to the inner cavity of the wedge-shaped groove 454 and is slidably connected to the wedge-shaped groove 454, a gear 2 457 is fixedly connected to the surface of the rotating ring 2 453, a motor 3 455 is fixedly installed on the right side of the fixed shell 41, and a gear 1 456 is fixedly connected to the output shaft of the motor 3 455, and the gear 1 456 is meshed with the gear 2 457.

[0051] In summary: the eccentric uneven wall thickness PVC conveying pipe expanding equipment and method, through the propulsion component 39 to operate the cone rod 38 to move forward, the cone rod 38 cooperates with the inner wall of the arc groove 37, so that the four expanding blocks 36 expand outward, and the expansion distance increases as the cone rod 38 moves forward. The cone rod 38 moves backward, and the spring 313 causes the four expanding blocks 36 to move toward each other, so as to realize the expansion requirements of various specifications. The cooperation of the roller support 6, the moving component 5 and the centering clamp 4 can make the PVC conveying pipe automatically switch back and forth between the heating device 2 and the adjustable expanding component 3, reducing manpower input, so that the use of a size-adjustable expanding mold can be suitable for expanding of various specifications, without the need to frequently replace the expanding mold, and no human intervention is required to transfer from the heating station to the expanding station, with a high degree of automation, thereby improving the purpose of convenient operation.

[0052] The technical features disclosed above are not limited to the disclosed combinations with other features. Those skilled in the art may also make other combinations between the technical features according to the purpose of the invention to achieve the purpose of the invention.

Claims

1. A method for expanding an eccentric uneven wall thickness PVC conveying pipe, applied to an eccentric uneven wall thickness PVC conveying pipe expanding device, characterized in that: The expansion device comprises a base plate (1); a heating device (2) is fixedly mounted on the rear side of the top of the base plate (1); an adjustable expansion component (3) is arranged on the rear side of the top of the base plate (1) and is located on the right side of the heating device (2); the adjustable expansion component (3) comprises a vertical plate (31) fixedly connected to the base plate (1); a rotatable hollow rotating tube (32) is penetrated through one side of the vertical plate (31); a rotating disk (32) is fixedly connected to the front side of the hollow rotating tube (32); 3), the front side of the rotating disk (33) is provided with four rectangular grooves (34) in an annular array, the inner cavity of the rectangular groove (34) is slidably connected to a slider (35), the front side of the slider (35) is fixedly connected to a flaring block (36), the inner side of the flaring block (36) is provided with an arc groove (37), the inner cavity of the hollow rotating tube (32) is slidably connected to a cone rod (38) adapted to the arc groove (37), the rear side of the vertical plate (31) is provided with a fixed plate (38) connected to the base plate (1) A support platform (310) connected to the support platform (310) is provided with a propulsion assembly (39) between the support platform (310) and the cone rod (38), a rotating assembly (311) is provided between the hollow rotating tube (32) and the base plate (1), a centering fixture (4) is provided in the middle of the top of the base plate (1), and the centering fixture (4) includes a fixed shell (41), and the inner cavity of the fixed shell (41) is provided with four square grooves (42) in an annular array, and the inner cavity of the square groove (42) is slidably connected A square slider (43) is provided, one end of the square slider (43) extends to the inner cavity of the fixed shell (41) and is fixedly connected to a clamping block (44), a driving assembly (45) is provided between the square slider (43) and the fixed shell (41), a moving assembly (5) is provided between the fixed shell (41) and the base plate (1), the moving assembly (5) comprises a side shift assembly (51) and a front and rear shift assembly (52), and a roller support (6) is installed on the front side of the top of the base plate (1); A method for expanding an eccentric and uneven wall thickness PVC conveying pipe, the method for expanding the PVC conveying pipe is as follows: Step 1: Place the PVC conveying pipe on the roller support (6) so that the expanded end passes through the fixed shell (41), then the motor three (455) drives the gear one (456) to rotate, and the gear one (456) drives the gear two (457) and the rotating ring two (453) to rotate, so that the sliding pin (451) slides in the inner cavity of the wedge groove (454), and then the inner cavities of the four sliding pins (451) slide towards each other, thereby causing the four square sliders (43) to slide towards each other in the inner cavity of the square groove (42), so that the four clamping blocks (44) are clamped on the surface of the PVC conveying pipe to fix the PVC conveying pipe, and then the forward and backward moving component (52) causes the centering clamp (4) and the clamped PVC conveying pipe to move backward, so that the end of the PVC conveying pipe extends into the inner cavity of the heating device (2) for heating and softening; Step 2: After the end of the PVC conveying pipe is heated to a temperature at which the pipe can be expanded, the front-back moving assembly (52) causes the centering clamp (4) and the clamped PVC conveying pipe to move forward, so that the end of the PVC conveying pipe is separated from the inner cavity of the heating device (2). Then, the side moving assembly (51) drives the front-back moving assembly (52), the centering clamp (4) and the PVC conveying pipe to move, so that the PVC conveying pipe faces the adjustable expanding assembly (3). Then, the front-back moving assembly (52) causes the centering clamp (4) and the clamped PVC conveying pipe to move backward, so that the expanded end is sleeved on the surfaces of the four expanding blocks (36). Step 3: Then the motor 2 (3111) drives the hollow rotating tube (32) and the rotating disk (33) to rotate through the pulley 1 (3112), the pulley 2 (3113) and the belt (3114), and the rotating disk (33) drives the flaring block (36) to rotate through the slider (35). During this period, the motor 1 (395) is started, and the bevel gear 1 (396) and the bevel gear 2 (397) drive the threaded sleeve (393) to rotate. Due to the thread, the threaded rod (394) moves forward under the cooperation of the guide convex strip (3910) and the guide groove (3911), and the threaded rod (394) drives the cone rod ( 38) slides forward in the inner cavity of the four arc-shaped grooves (37), and the frustum rod (38) slides forward in the inner cavity of the arc-shaped groove (37), which causes the four expansion blocks (36) to move in opposite directions to expand the PVC delivery pipe. During the movement of the expansion block (36), the slider (35) is driven to slide on the surface of the limit rod (312) and squeeze the spring (313). During this period, the expansion block (36) is still in a rotating state, so that the expansion part of the end of the PVC delivery pipe is more rounded. The more the frustum rod (38) moves forward, the greater the distance between the four expansion blocks (36) is opened, so that the expansion of delivery pipes with various calibers can be achieved; Step 4: After the expansion is completed, the motor 2 (3111) stops working, and then the motor 1 (395) reverses, so that the threaded rod (394) drives the annular limit groove (398) to move backward, and the thrust on the expansion block (36) is slowly cancelled. The restoring force of the four springs (313) causes the four sliders (35) to slide toward each other on the surfaces of the four limit rods (312), and the four expansion blocks (36) move toward each other, canceling the internal support of the PVC conveying pipe. Then the forward and backward moving assembly (52) works to drive the centering clamp (4) and the expanded PVC conveying pipe to separate from the surface of the expansion block (36), and then the motor 3 (455) reverses, so that the four square sliders (43) and the clamping block (44) move away from each other, canceling the clamping of the PVC conveying pipe, and the user can pull out the expanded PVC conveying pipe; It should be noted that the PVC conveying pipe is placed on the top of the roller support (6), and no obstruction will occur during the movement, thereby reducing the friction of the PVC conveying pipe during movement.

2. The method for expanding an eccentric non-uniform wall thickness PVC conveying pipe according to claim 1, characterized in that: The propulsion assembly (39) includes a fixed plate (391) fixedly connected to the top of the support platform (310), a fixed seat (392) is fixedly installed on the rear side of the fixed plate (391), the inner cavity of the fixed seat (392) is rotatably connected to a threaded sleeve (393), the inner cavity of the threaded sleeve (393) is threadedly connected to a threaded rod (394), and the front end of the threaded rod (394) is fixedly connected to the cone rod (38).

3. The method for expanding an eccentric non-uniform wall thickness PVC conveying pipe according to claim 2, characterized in that: The surface of the threaded sleeve (393) is fixedly connected with a bevel gear 2 (397), the top of the support platform (310) is fixedly installed with a motor 1 (395), the output shaft of the motor 1 (395) is fixedly installed with a bevel gear 1 (396), and the bevel gear 1 (396) is meshed with the bevel gear 2 (397).

4. The method for expanding an eccentric non-uniform wall thickness PVC conveying pipe according to claim 3, characterized in that: An annular limiting groove (398) is provided on the rear side of the fixing seat (392), and a rotating ring (399) is fixedly connected to the surface of the threaded sleeve (393) and rotates in the inner cavity of the annular limiting groove (398).

5. The method for expanding an eccentric non-uniform wall thickness PVC conveying pipe according to claim 4, characterized in that: Both sides of the inner cavity of the fixing seat (392) are fixedly connected with guide convex strips (3910), and both sides of the surface of the threaded rod (394) are provided with guide grooves (3911) for the guide convex strips (3910) to slide.

6. The method for expanding an eccentric non-uniform wall thickness PVC conveying pipe according to claim 5, characterized in that: The rotating assembly (311) comprises a second motor (3111) fixedly mounted on the top of the base plate (1); a first pulley (3112) is fixedly mounted on the output shaft of the second motor (3111); a second pulley (3113) is fixedly connected to the surface of the hollow rotating tube (32); and the first pulley (3112) and the second pulley (3113) are connected to each other via a belt (3114).

7. The method for expanding an eccentric non-uniform wall thickness PVC conveying pipe according to claim 6, characterized in that: The driving assembly (45) comprises a sliding pin (451) fixedly connected to the front side of the square slider (43); a sliding groove (452) for the sliding pin (451) to slide is provided on one side of the inner cavity of the square groove (42); a rotating ring 2 (453) is rotatably connected to the front side of the fixed shell (41); four wedge-shaped grooves (454) are provided on the front side of the rotating ring 2 (453); a front end of the sliding pin (451) extends to the inner cavity of the wedge-shaped groove (454) and is slidably connected to the wedge-shaped groove (454).

8. The method for expanding an eccentric non-uniform wall thickness PVC conveying pipe according to claim 7, characterized in that: The surface of the rotating ring 2 (453) is fixedly connected with a gear 2 (457), the right side of the fixed shell (41) is fixedly installed with a motor 3 (455), the output shaft of the motor 3 (455) is fixedly connected with a gear 1 (456), and the gear 1 (456) is meshed with the gear 2 (457).

9. The method for expanding an eccentric non-uniform wall thickness PVC conveying pipe according to claim 8, characterized in that: The front-rear moving assembly (52) is mounted on the moving end of the side moving assembly (51), and the fixed shell (41) is fixedly mounted on the moving end of the front-rear moving assembly (52).

10. The method for expanding an eccentric non-uniform wall thickness PVC conveying pipe according to claim 9, characterized in that: The inner cavity of the rectangular groove (34) is fixedly connected to a limit rod (312), the surface of the limit rod (312) is sleeved with a spring (313), the slider (35) is slidably connected to the surface of the limit rod (312), and the two ends of the spring (313) are respectively fixedly connected to the slider (35) and the inner wall of the rectangular groove (34).

Images