A PE pipe expansion device and method capable of processing PE pipes with different diameters

Abstract

The present invention discloses a PE pipe expansion device and method capable of processing different pipe diameters, and relates to the technical field of PE pipe expansion. The present invention comprises a base, a lead screw linear slide module is fixedly installed on the top of the base, a flaring assembly is installed on the top of the lead screw linear slide module, the flaring assembly comprises a bracket fixedly installed on the lead screw linear slide module, a rotating shaft is rotatably installed on the top of the bracket, an electric heating head is arranged on the left side of the rotating shaft, and multiple groups of flaring strips are hinged on the outer side of the electric heating head, and the cross section of the flaring strip is C-shaped. The present invention sets a special structure of the flaring strip, the cross section of the flaring strip located on the outer side of the guide frame is C-shaped, the cross section of the flaring strip on the guide frame is arc-shaped, the C-shaped flaring strip has a strong bending strength, which is sufficient to support the flaring, the arc-shaped flaring strip can be bent at any angle, which is convenient for adjustment, the flaring strip always remains integrated, and the flaring smoothness is high.

Description

Technical Field

[0001] The invention relates to the technical field of PE pipe expansion, and in particular to a PE pipe expansion device and method capable of processing PE pipes with different pipe diameters. Background Art

[0002] With the development of industry and the improvement of living standards, polyethylene (PE) pipes have been widely used in municipal water supply, gas pipelines, agricultural irrigation and other fields due to their excellent corrosion resistance, compressive strength and long service life. However, in actual use, PE pipes often need to be connected with other pipes or equipment, which requires the pipe ends to be expanded so that they can be effectively connected with joints or other pipes.

[0003] After searching, the patent number CN115056472A discloses a PE pipe expansion device that can process different pipe diameters, including a base as a mounting support, a flaring structure for flaring the PE pipe is movably provided on one side of the base, an adjustment structure for adjusting the flared PE pipe left and right is movably provided on one side of the flaring structure, and a fixed structure for placing and fixing the PE pipe is symmetrically provided above the adjustment structure. The device heats the adjustment plate through the internal electric heating wire during the operation of the adjustment plate, and drives the adjustment rod to rotate through the output motor. When the adjustment plate rotates, the straight rod drives the double-hole connecting plate to move, and the double-hole connector moves the adjustment plate up and down during the movement. When the adjustment plate is adjusted by force, the diameter of the pipe is expanded. Although this method can control the flaring radius of the PE pipe, due to the fixed shape of the adjustment plate, when the flaring radius is large, the connection between the flaring part and the normal part will produce a sharp deformation, and a local stress concentration will be formed at the flaring part, which increases the risk of rupture and reduces the overall strength and durability of the pipeline. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems and provide a device and method for expanding PE pipes with different diameters.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0006] A PE pipe expansion device capable of processing different pipe diameters comprises a base, a lead screw linear slide module is fixedly mounted on the top of the base, a flaring assembly is mounted on the top of the lead screw linear slide module, the flaring assembly comprises a bracket fixedly mounted on the lead screw linear slide module, a rotating shaft is rotatably mounted on the top of the bracket, the rotating shaft is driven by a rotating motor, an electric heating head is arranged at one end of the rotating shaft, a plurality of groups of flaring strips are hingedly connected to the outer side of the electric heating head, the plurality of groups of flaring strips are distributed in a ring shape, and the cross section of the flaring strips is C-shaped;

[0007] The outer side of the rotating shaft is provided with multiple groups of guide rods, the guide rods are tilted, the outer side of the guide rods is slidably connected with a guide frame, the outer surface of the guide frame is provided with an arc guide groove, the flared strip is inserted in the arc guide groove, the inside of the guide frame is provided with a slide rod, the outer side of the slide rod is slidably connected with a slider, the flared strip is fixedly connected with the slider along the arc guide groove, and a top spring is provided between the slider and the guide frame;

[0008] A pipe clamping assembly is arranged on the top of the base.

[0009] Furthermore, the flaring strip is made of beryllium copper alloy, and the guide frame is made of ceramic material.

[0010] Furthermore, an elastic inner frame is provided on the inner side of the expansion strip.

[0011] Furthermore, the guide rod is hinged on the rotating shaft, the outer side of the rotating shaft is provided with an external thread, the outer side of the external thread is threadedly connected to an adjusting nut, the outer side of the adjusting nut is rotatably installed with a swivel, the outer side of the swivel is hinged with multiple groups of connecting rods, the other end of the connecting rod is hinged to the guide rod, the outer side of the guide rod is sleeved with a sliding sleeve, the outer side of the sliding sleeve is threadedly connected to a locking bolt 1, a transmission rod is provided at the bottom of the guide frame, the transmission rod is hinged to the sliding sleeve, and a locking bolt 2 is threadedly connected to the hinge.

[0012] Furthermore, the outer walls of the rotating shaft and the guide rod are both provided with indicating scales, and the outer side of the adjusting nut is provided with an indicating ring, which is sleeved on the position of the indicating scale on the rotating shaft.

[0013] Furthermore, a cone head is provided on one side of the guide frame close to the electric heating head.

[0014] Furthermore, a horizontal bubble tube is fixedly mounted on the guide frame.

[0015] Furthermore, the tube clamping assembly includes two bracket sleeves fixedly installed on the top of the base, and three clamping bevel gears are rotatably installed on the outer side of each bracket sleeve. The three clamping bevel gears are distributed in a ring shape, and the internal threads of the clamping bevel gears are connected to the clamping screws, which penetrate into the bracket sleeves. The clamping screws on the same horizontal plane of the two bracket sleeves are connected by a clamping plate, and a clamping transmission ring is rotatably installed on the outer wall of the bracket sleeve, and internal bevel teeth are provided on the inner side of the clamping transmission ring, which mesh with the clamping bevel gears.

[0016] Furthermore, a machine base is fixedly installed on the top of the base, a clamping motor is fixedly installed on the top of the machine base, a driving shaft is fixedly installed on the output end of the clamping motor, two driving wheels are fixedly installed on the outer side of the driving shaft, the two driving wheels are arranged corresponding to the two clamping transmission rings, and the outer side of the clamping transmission ring is provided with external gear teeth, which are meshed with the driving wheels.

[0017] A method for expanding PE pipes with different diameters, comprising the following steps:

[0018] S1. Loading: Clamp the PE pipe on the pipe clamp assembly;

[0019] S2. Pre-adjustment of the flaring assembly: adjusting the position of the guide frame on the guide rod according to the flaring radius, so that the distance from the outer surface of the flaring strip on the guide frame to the axis of the rotating shaft is the flaring radius;

[0020] S3, flaring: start the equipment, the electric heating head is powered on for heating, the heat is transferred to the flaring strip, and then the lead screw linear guide module drives the flaring component to be inserted into the PE tube for flaring. After the flaring is completed, the lead screw linear guide module drives the flaring component to exit the PE tube;

[0021] S4. Unloading: Remove the PE tube from the tube clamp assembly.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1. The present invention sets a special structure of the expansion strip. The cross section of the expansion strip located outside the guide frame is C-shaped, and the cross section of the expansion strip on the guide frame is arc-shaped. The C-shaped expansion strip has strong bending strength and is sufficient to support the expansion. The arc-shaped expansion strip can be bent at any angle for easy adjustment, and its outer surface is arc-shaped, so it is not easy to scrape the material during expansion. At the same time, the expansion strip always remains integrated, and the expansion smoothness is high.

[0024] 2. The present invention can adjust the expansion radius by sliding the guide frame along the inclined guide rod. At the same time, the distance between the guide frame and the electric heating head is changed, and the length of the C-shaped expansion strip can be adjusted, thereby changing the expansion buffer length and angle, which can effectively reduce stress concentration at the expansion point and improve the expansion quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is an exploded view of the overall structure of the present invention;

[0027] Figure 3 is an exploded view of the flaring assembly of the present invention;

[0028] Figure 4 It is a schematic diagram of the rotating shaft structure of the present invention;

[0029] Figure 5 This is a schematic diagram of the assembly of the guide frame and the flaring strip of the present invention;

[0030] Figure 6 This is a schematic diagram of disassembling the guide frame and the flaring strip of the present invention;

[0031] Figure 7is a schematic diagram of the flared strip of the present invention;

[0032] Figure 8 It is a schematic diagram of the pipe clamping assembly of the present invention.

[0033] 1. Base; 11. Machine base; 12. Clamping motor; 13. Driving shaft; 14. Driving wheel; 2. Lead screw linear slide module; 3. Bracket; 4. Rotating shaft; 41. Electric heating head; 42. Guide rod; 43. Sliding sleeve; 44. External thread; 45. Adjusting nut; 46. Connecting rod; 47. Indicating scale; 48. Indicating ring; 49. Locking bolt one; 5. Guide frame; 51. Transmission rod; 52. Sliding rod; 53. Sliding block; 54. Top spring; 55. Arc guide groove; 56. Cone head; 57. Locking bolt two; 58. Horizontal bubble tube; 6. Expanding strip; 61. Elastic inner skeleton; 7. Tube clamping assembly; 71. Bracket sleeve; 72. Clamping bevel gear; 73. Clamping screw; 74. Clamping plate; 75. Clamping transmission ring. DETAILED DESCRIPTION

[0034] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0035] Embodiment 1, as Figure 1-Figure 8 As shown, a PE pipe expanding device capable of processing different pipe diameters comprises a base 1, a lead screw linear guide rail module 2 is fixedly mounted on the top of the base 1, a flaring assembly is mounted on the top of the lead screw linear guide rail module 2, the flaring assembly comprises a bracket 3 fixedly mounted on the lead screw linear guide rail module 2, a rotating shaft 4 is rotatably mounted on the top of the bracket 3, the rotating shaft 4 is driven by a rotating motor, an electric heating head 41 is arranged at one end of the rotating shaft 4, a plurality of groups of flaring strips 6 are hingedly connected to the outer side of the electric heating head 41, the plurality of groups of flaring strips 6 are distributed in an annular shape, and the cross section of the flaring strip 6 is C-shaped;

[0036] A plurality of guide rods 42 are arranged on the outer side of the rotating shaft 4, preferably six groups are arranged, the guide rods 42 are inclined, the outer side of the guide rods 42 is slidably connected with a guide frame 5, the outer surface of the guide frame 5 is provided with an arc guide groove 55, the flaring strip 6 is inserted into the arc guide groove 55, a sliding rod 52 is arranged inside the guide frame 5, a slider 53 is slidably connected to the outer side of the sliding rod 52, the flaring strip 6 is fixedly connected to the slider 53 along the arc guide groove 55, and a top spring 54 is arranged between the slider 53 and the guide frame 5;

[0037] A pipe clamping assembly 7 is provided on the top of the base 1 .

[0038] When in use, the PE pipe is clamped on the pipe clamping assembly 7. The axis of the PE pipe after clamping coincides with the axis of the rotating shaft 4. The guide frame 5 is controlled to slide along the guide rod 42 according to the size of the expansion. When the expansion radius is large, the expansion part of the PE pipe will be thinner. If the direct expansion method is adopted, the connection between the expansion part and the normal part will produce sharp deformation, and local stress concentration will be formed at the expansion part, which will increase the risk of rupture and reduce the overall strength and durability of the pipeline. Therefore, the conventional expansion method is prone to quality problems. In the present invention, the guide frame 5 slides along the guide rod 42, and the guide rod 42 is inclined. The flaring radius increases, and the guide frame 5 is away from the electric heating head 41. Since one end of the flaring strip 6 is hinged on the electric heating head 41, the length of the flaring strip 6 that slides out of the guide frame 5 increases. Therefore, the length of the C-shaped flaring strip 6 increases, and then the buffer distance at the connection between the flared part and the normal part is increased. Through the gradually changing flaring radius, the deformation of the pipe during the flaring process is smoother, which can avoid local stress concentration. The larger the flaring radius, the longer the buffer length is, so as to ensure that the flaring quality meets the requirements. When the flaring radius is small, the buffer distance is shortened, so as to ensure the quality and increase the flaring speed.

[0039] After the adjustment is completed, the lead screw linear slide module 2 drives the flaring component to be inserted into the PE tube. The insertion end of the flaring component is tapered, so it can be quickly inserted into the PE tube, and as it continues to go deeper, the PE tube is gradually expanded until the guide frame 5 is also inserted into the PE tube. At the same time, the flaring strip 6 located on the outside of the guide frame 5 adopts a C-shaped structure design, so that it has sufficient bending strength and is sufficient to support the expansion. The flaring strip 6 located on the guide frame 5 is expanded into an arc under the action of the arc guide groove 55, and the bending strength is reduced, so it can be bent, so it can be bent along the shape of the guide frame 5, which is convenient for storage. Through this structural design, the flaring strip 6 is always a whole during the change process, and the bending part is smooth. The outer surface of the flaring strip 6 is also arc-shaped. During the expansion process, the flaring component will rotate relative to the PE tube, and the flaring strip 6 is always in smooth contact with the inner wall of the PE tube, ensuring that the inner wall of the expansion will not be scratched, the inner wall of the expansion is smooth, and the expansion quality is high.

[0040] After the expansion is completed, the lead screw linear guide rail module 2 drives the expansion component to withdraw from the PE pipe, and after the PE pipe is cooled, it can be removed from the pipe clamping assembly 7.

[0041] Furthermore, the expansion strip 6 is made of beryllium copper alloy, and the guide frame 5 is made of ceramic material. Beryllium copper alloy is a common copper alloy, which has good thermal conductivity, high elasticity and rigidity. Its thermal conductivity is close to that of pure copper. Beryllium copper has high hardness and strong rigidity. Compared with ordinary copper alloy, beryllium copper alloy has high elastic modulus and can recover faster when stressed. Combined with the C-shaped structure design, it fully meets the use of PE pipe expansion.

[0042] Furthermore, an elastic inner frame 61 is provided on the inner side of the expansion strip 6 . The provision of the elastic inner frame 61 can not only improve the recovery speed of the expansion strip 6 , but also improve the strength of the expansion strip 6 .

[0043] Embodiment 2, on the basis of the above embodiment, further includes: the guide rod 42 is hinged on the rotating shaft 4, the outer side of the rotating shaft 4 is provided with an external thread 44, the outer side of the external thread 44 is threadedly connected with an adjusting nut 45, the outer side of the adjusting nut 45 is rotatably installed with a swivel, the outer side of the swivel is hinged with multiple groups of connecting rods 46, the other end of the connecting rod 46 is hinged to the guide rod 42, the outer side of the guide rod 42 is sleeved with a sliding sleeve 43, the outer side of the sliding sleeve 43 is threadedly connected with a locking bolt 49, and a transmission rod 51 is provided at the bottom of the guide frame 5, the transmission rod 51 is hinged to the sliding sleeve 43, and a locking bolt 57 is threadedly connected to the hinge.

[0044] Due to the different thicknesses of pipes, different gradient lengths are required during expansion. Thicker pipes do not require a larger gradient length. Appropriately reducing the gradient length can improve production efficiency. Thinner pipes require an increased gradient length to ensure the quality of expansion. Therefore, in order to make the device suitable for pipes of different thicknesses, the structure of this embodiment is provided. By rotating the adjusting nut 45, the adjusting nut 45 drives the swivel to move, the swivel drives the connecting rod 46 to move, and the connecting rod 46 changes the inclination angle of the guide rod 42, thereby changing the gradient length.

[0045] Since the angle of the guide rod 42 is adjustable, the guide frame 5 cannot maintain horizontal sliding on the guide rod 42. Therefore, through the arrangement of the sliding sleeve 43 and the transmission rod 51, when the angle of the guide rod 42 changes, the locking bolt 2 57 is loosened, and when the guide frame 5 is adjusted to be horizontal, the locking bolt 2 57 is tightened again. At this time, the guide frame 5 can slide horizontally along the guide rod 42. When the expansion radius adjustment is completed, the locking bolt 1 49 is tightened to fix the sliding sleeve 43 on the guide rod 42 to ensure that the guide frame 5 cannot slide relative to the guide rod 42 during the expansion process, and the expansion is stable.

[0046] Embodiment 3, based on the above embodiment, further includes that the outer walls of the rotating shaft 4 and the guide rod 42 are both provided with indicating scales 47 , and the outer side of the adjusting nut 45 is provided with an indicating ring 48 , and the indicating ring 48 is sleeved on the position of the indicating scale 47 on the rotating shaft 4 .

[0047] By setting the indicating scale 47 on the guide rod 42, multiple sets of sliding sleeves 43 can be locked in the same position of multiple sets of guide rods 42, thereby improving the smoothness of the PE pipe expansion. By setting the indicating ring 48 and the indicating scale 47 on the rotating shaft 4, the inclination angle of the guide rod 42 can be accurately controlled.

[0048] Embodiment 4, based on the above embodiment, further includes that a cone head 56 is provided on one side of the guide frame 5 close to the electric heating head 41. Through this design, the transition between the C-shaped part and the arc-shaped part on the flared strip 6 is smoother.

[0049] Embodiment 5, based on the above embodiment, further includes that a horizontal bubble tube 58 is fixedly installed on the outer side of the guide frame 5. This design facilitates the adjustment of the level of the guide frame 5.

[0050] Embodiment 6, on the basis of the above embodiment, further includes that the tube clamping assembly 7 includes two bracket sleeves 71 fixedly installed on the top of the base 1, and three clamping bevel gears 72 are rotatably installed on the outer side of each bracket sleeve 71, and the three clamping bevel gears 72 are distributed in a ring shape. The internal thread of the clamping bevel gear 72 is connected with a clamping screw 73, and the clamping screw 73 passes through the bracket sleeve 71. The clamping screws 73 on the same horizontal plane of the two bracket sleeves 71 are connected by a clamping plate 74, and the outer wall of the bracket sleeve 71 is rotatably installed with a clamping transmission ring 75, and the inner side of the clamping transmission ring 75 is provided with inner bevel teeth, which mesh with the clamping bevel gear 72.

[0051] Furthermore, a base 11 is fixedly installed on the top of the base 1, a clamping motor 12 is fixedly installed on the top of the base 11, a driving shaft 13 is fixedly installed on the output end of the clamping motor 12, two driving wheels 14 are fixedly installed on the outer side of the driving shaft 13, the two driving wheels 14 are arranged corresponding to the two clamping transmission rings 75, and the outer side of the clamping transmission ring 75 is provided with external gear teeth, which are meshed with the driving wheels 14.

[0052] When clamping, the PE pipe is passed through the two bracket sleeves 71, and then the clamping motor 12 is controlled to be energized, the clamping motor 12 drives the driving shaft 13 to rotate, the driving shaft 13 drives the two driving wheels 14 to rotate synchronously, the two driving wheels 14 drive the clamping transmission ring 75 to rotate synchronously, the clamping transmission ring 75 drives the clamping bevel gear 72 to rotate, the clamping bevel gear 72 drives the clamping screw 73 to move toward the middle of the bracket sleeve 71, and the clamping screw 73 drives the clamping plate 74 to clamp the PE pipe. Since the three clamping plates 74 move synchronously toward the center of the bracket sleeve 71, the PE pipe can be clamped in the middle of the bracket sleeve 71 so that its axis coincides with the axis of the rotating shaft 4.

[0053] Embodiment 7, a method for expanding PE pipes capable of processing PE pipes with different pipe diameters, comprising the following steps:

[0054] S1, loading: clamping the PE pipe on the pipe clamping assembly 7;

[0055] S2, pre-adjustment of the flaring assembly: adjusting the position of the guide frame 5 on the guide rod 42 according to the flaring radius, so that the distance from the outer surface of the flaring strip 6 on the guide frame 5 to the axis of the rotating shaft 4 is the flaring radius;

[0056] S3, expanding: start the equipment, the electric heating head 41 is powered on for heating, the heat is transferred to the expanding strip 6, and then the lead screw linear guide rail module 2 drives the expanding component to be inserted into the PE tube for expanding. After the expanding is completed, the lead screw linear guide rail module 2 drives the expanding component to exit the PE tube;

[0057] S4, unloading: remove the PE tube from the tube clamping assembly 7.

[0058] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A PE pipe expansion device capable of processing PE pipes of different diameters, comprising a base (1), characterized in that: A lead screw linear guide rail module (2) is fixedly mounted on the top of the base (1), a flaring assembly is mounted on the top of the lead screw linear guide rail module (2), the flaring assembly comprises a bracket (3) fixedly mounted on the lead screw linear guide rail module (2), a rotating shaft (4) is rotatably mounted on the top of the bracket (3), the rotating shaft (4) is driven by a rotating motor, an electric heating head (41) is arranged at one end of the rotating shaft (4), a plurality of groups of flaring strips (6) are hingedly connected to the outer side of the electric heating head (41), the plurality of groups of flaring strips (6) are distributed in a ring shape, and the cross section of the flaring strips (6) is C-shaped; A plurality of guide rods (42) are arranged on the outer side of the rotating shaft (4), the guide rods (42) are tilted, the outer side of the guide rods (42) is slidably connected to a guide frame (5), the outer surface of the guide frame (5) is provided with an arc-shaped guide groove (55), the flaring strip (6) is inserted into the arc-shaped guide groove (55), a sliding rod (52) is arranged inside the guide frame (5), the outer side of the sliding rod (52) is slidably connected to a slider (53), the flaring strip (6) is fixedly connected to the slider (53) along the arc-shaped guide groove (55), and a top spring (54) is arranged between the slider (53) and the guide frame (5); A pipe clamping assembly (7) is provided on the top of the base (1).

2. The device for expanding PE pipes of different diameters according to claim 1, characterized in that: The flaring strip (6) is made of beryllium copper alloy, and the guide frame (5) is made of ceramic material.

3. The device for expanding PE pipes of different diameters according to claim 2, characterized in that: An elastic inner frame (61) is provided on the inner side of the flaring strip (6).

4. The device for expanding PE pipes of different diameters according to claim 3, characterized in that: The guide rod (42) is hinged on the rotating shaft (4). The outer side of the rotating shaft (4) is provided with an external thread (44). The outer side of the external thread (44) is threadedly connected to an adjusting nut (45). A swivel is rotatably mounted on the outer side of the adjusting nut (45). A plurality of connecting rods (46) are hingedly connected to the outer side of the swivel. The other end of the connecting rod (46) is hingedly connected to the guide rod (42). The outer side of the guide rod (42) is sleeved with a sliding sleeve (43). The outer side of the sliding sleeve (43) is threadedly connected to a locking bolt 1 (49). A transmission rod (51) is provided at the bottom of the guide frame (5). The transmission rod (51) is hingedly connected to the sliding sleeve (43). A locking bolt 2 (57) is threadedly connected to the hinge.

5. The device for expanding PE pipes of different diameters according to claim 4, characterized in that: The outer walls of the rotating shaft (4) and the guide rod (42) are both provided with indicating scales (47), and the outer side of the adjusting nut (45) is provided with an indicating ring (48), which is sleeved on the position of the indicating scale (47) on the rotating shaft (4).

6. The device for expanding PE pipes of different diameters according to claim 5, characterized in that: A cone head (56) is provided on one side of the guide frame (5) close to the electric heating head (41).

7. The device for expanding PE pipes of different diameters according to claim 6, characterized in that: A horizontal bubble tube (58) is fixedly mounted on the guide frame (5).

8. The device for expanding PE pipes of different diameters according to claim 1, characterized in that: The pipe clamping assembly (7) comprises two support sleeves (71) fixedly mounted on the top of the base (1); three clamping bevel gears (72) are rotatably mounted on the outer side of each support sleeve (71); the three clamping bevel gears (72) are distributed in a ring shape; the inner threads of the clamping bevel gears (72) are connected to clamping screws (73); the clamping screws (73) penetrate into the support sleeve (71); the clamping screws (73) on the same horizontal plane of the two support sleeves (71) are connected via a clamping plate (74); a clamping transmission ring (75) is rotatably mounted on the outer wall of the support sleeve (71); inner bevel teeth are provided on the inner side of the clamping transmission ring (75); the inner bevel teeth mesh with the clamping bevel gears (72).

9. The device for expanding PE pipes of different diameters according to claim 8, characterized in that: A base (11) is fixedly mounted on the top of the base (1), a clamping motor (12) is fixedly mounted on the top of the base (11), a driving shaft (13) is fixedly mounted on the output end of the clamping motor (12), two driving wheels (14) are fixedly mounted on the outer side of the driving shaft (13), the two driving wheels (14) are arranged correspondingly to the two clamping transmission rings (75), and the outer side of the clamping transmission ring (75) is provided with external gear teeth, which mesh with the driving wheels (14).

10. A method for expanding PE pipes of different diameters, using a device for expanding PE pipes of different diameters as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: S1, loading: clamping the PE pipe on the pipe clamping assembly (7); S2, pre-adjustment of the flaring assembly: adjusting the position of the guide frame (5) on the guide rod (42) according to the flaring radius, so that the distance from the outer surface of the flaring strip (6) on the guide frame (5) to the axis of the rotating shaft (4) is the flaring radius; S3, expanding: start the equipment, the electric heating head (41) is powered on for heating, the heat is transferred to the expanding strip (6), and then the lead screw linear guide rail module (2) drives the expanding component to be inserted into the PE tube for expanding. After the expanding is completed, the lead screw linear guide rail module (2) drives the expanding component to exit the PE tube; S4, unloading: remove the PE tube from the tube clamp assembly (7).

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