Pipe flaring device for PVC pipe production

Abstract

The utility model discloses a pipe flaring device for PVC pipe production, and relates to the technical field of flaring devices, the pipe flaring device comprises a base, a supporting seat is fixedly installed on the top surface of the base, a lifting assembly is arranged on the inner side of the supporting seat, one end of the lifting assembly is fixedly connected with a mounting plate, and the other end of the lifting assembly is fixedly connected with a rotating shaft. The device comprises a base, a mounting plate is arranged on the top surface of the base, a flaring assembly used for flaring a PVC pipe is arranged on the bottom surface of the mounting plate, an adjusting assembly is arranged on the inner side of the flaring assembly, a positioning column is fixedly mounted in the center of the top surface of the base, and positioning assemblies are arranged on the two sides of the positioning column in a penetrating mode. And then the pipe is fixed to the outer side of the positioning column through the fixing assembly, and deviation of the pipe in the flaring process is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of flaring devices, in particular to a pipe flaring device for PVC pipe production. Background Art

[0002] PVC pipe, namely rigid polyvinyl chloride pipe, is extruded by hot pressing after being compounded with polyvinyl chloride resin, stabilizer, lubricant, etc. It is the earliest plastic material developed and applied. When producing PVC pipes, the length is limited. To meet the requirement of long-distance water transportation, multiple sections of PVC pipes need to be connected, usually by socket connection. Therefore, the radii of both ends of the PVC pipes need to be different. Since the PVC pipes are in a tubular shape with the same overall radius after initial forming, it is necessary to flare the PVC pipes.

[0003] As disclosed in a utility model with the authorization announcement number CN221112857U, a PVC pipe production flaring device, by setting a pipe positioning column and sleeving the lower end of the PVC pipe to be flared on the pipe positioning column, the PVC pipe can be effectively limited by the pipe positioning column. By rotating the adjusting head to drive the screw rod to rotate, the movable seat can be driven to move upward or downward. The movement of the movable seat can drive the two flaring arms to approach or move away synchronously through the cooperation of the waist-shaped groove and the connecting sliding column, so that the pipe can be flared to a certain diameter as required, and the practicability is stronger.

[0004] The following problems still exist when using this prior art:

[0005] The pipe positioning column of this device is fixedly installed on the top surface of the base, and its diameter is fixed. When positioning a PVC pipe with a larger inner diameter, the inner wall of the pipe cannot fully contact the outer surface of the pipe positioning column, so that the pipe is still in a movable state outside the pipe positioning column. During the subsequent flaring of the pipe, the pipe may shift, thus affecting the flaring process. Summary of the Utility Model

[0006] In order to overcome the deficiencies of the prior art, the utility model provides a pipe flaring device for PVC pipe production. By setting a positioning component, when positioning the pipe, the pipe can be sleeved on the positioning column. At this time, the positioning component can be used to drive the two sliding rods to move synchronously to both sides. While the sliding rods are moving, the two abutting blocks can be driven to move synchronously. When the two abutting blocks contact the inner wall of the pipe, the pipe can be fixed outside the positioning column, preventing the pipe from shifting during the subsequent flaring process. And according to the distance that the two abutting blocks move to both sides, this device can be applicable to pipes with different inner diameters, greatly increasing the practicability of this device.

[0007] To solve the above technical problems, the present utility model provides the following technical solutions: A pipe flaring device for PVC pipe production, including a base, on the top surface of the base is fixedly installed a support seat, inside the support seat is provided a lifting assembly, one end of the lifting assembly is fixedly connected to a mounting plate, on the bottom surface of the mounting plate is provided a flaring assembly for flaring the PVC pipe, inside the flaring assembly is provided an adjusting assembly, at the center of the top surface of the base is fixedly installed a positioning column, and on both sides of the positioning column are provided positioning components.

[0008] Preferably, the positioning component is composed of a resisting block, a sliding rod, a moving plate, a pulling block, a pulling rope, a winding roller, a rotating rod, a worm gear and a double-threaded worm. The two sliding rods are arranged on both sides of the positioning column, and one end of the sliding rod is fixedly connected to the resisting block, and the resisting block is placed outside the positioning column. The other ends of the two sliding rods are fixedly connected to the moving plate. At the center of one side of the two moving plates is fixedly connected a pulling block. Inside the two pulling blocks is fixedly connected a pulling rope. One end of the two pulling ropes is wound around the outer surface of the winding roller. One side of the two winding rollers is fixedly connected to a rotating rod. One end of the two rotating rods is fixedly connected to a worm gear. On one side of the two worm gears is meshed a double-threaded worm.

[0009] Preferably, inside the base are symmetrically provided support plates, and the winding roller is fixedly installed on one side of the support plate through a fixing frame. On one side of the two moving plates are symmetrically connected springs, and the other end of the spring is connected to the support plate. On the outer surface of the positioning column are symmetrically installed sliding sleeves, and the sliding rod is arranged through the sliding sleeve.

[0010] Preferably, inside the base are symmetrically opened sliding grooves, and on the bottom surface of the two moving plates is fixedly connected a sliding block, and the sliding block is placed inside the sliding groove and is slidably connected thereto.

[0011] Preferably, on one side of the base is fixedly installed a driving housing, on the outer surface of the driving housing is fixedly installed a positioning motor through a fixing frame, and the output end of the positioning motor is connected to the double-threaded worm.

[0012] Preferably, the lifting assembly is composed of a lifting groove, a hydraulic rod and a lifting block. The two lifting grooves are symmetrically opened on one side of the support seat. The hydraulic rod is fixedly installed on the top surface of the support seat, and the bottom end of the hydraulic rod is connected to the top surface of the mounting plate. The two lifting blocks are fixedly connected to one side of the mounting plate, and the two lifting blocks are respectively placed inside the two lifting grooves and are slidably connected thereto.

[0013] Preferably, the flaring assembly is composed of a rotating motor, a rotating shaft, a rotating block, a connecting plate and a flaring rod. The rotating motor is fixedly installed on the bottom surface of the mounting plate. The output end of the rotating motor is connected with a rotating shaft. The bottom end of the rotating shaft is fixedly connected with a rotating block. Two connecting plates are arranged on the bottom surface of the rotating block. The bottom surfaces of the two connecting plates are fixedly connected with a flaring rod.

[0014] Preferably, the adjusting assembly is composed of an adjusting groove, a bidirectional threaded rod, a moving block, a guide rod and a guide block. The two adjusting grooves are symmetrically arranged on the bottom surface of the rotating block. The inside of the two adjusting grooves is respectively provided with a bidirectional threaded rod and a guide rod. The bidirectional threaded rod penetrates through the moving block. The guide rod penetrates through the guide block. The guide block and the moving block are fixedly connected with the connecting plate.

[0015] Compared with the prior art, the beneficial effects that the utility model can achieve are as follows:

[0016] 1. By setting the positioning assembly, when positioning the pipe, the pipe can be sleeved on the positioning column. At this time, through the positioning assembly, two sliding rods can be driven to move synchronously to both sides. While the sliding rods are moving, two abutting blocks can be driven to move synchronously. When the two abutting blocks are in contact with the inner wall of the pipe, the pipe can be fixed on the outside of the positioning column, preventing the pipe from shifting during the subsequent flaring process. And according to the distance that the two abutting blocks move to both sides, the device can be applied to pipes with different inner diameters, greatly increasing the practicability of the device;

[0017] 2. By setting the adjusting assembly, during use, the distance between the two flaring rods can be adjusted through the adjusting assembly, so as to carry out the flaring work on pipes with different inner diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional structural diagram of the utility model;

[0019] Figure 2 is a structural diagram of the mounting plate of the utility model;

[0020] Figure 3 is a structural diagram of the adjusting assembly of the utility model;

[0021] Figure 4 is a structural diagram of the internal structure of the positioning column of the utility model;

[0022] Figure 5 is a structural diagram of the positioning assembly of the utility model;

[0023] Wherein: 1. Base; 2. Positioning column; 3. Driving housing; 4. Positioning motor; 5. Support base; 6. Lifting groove; 7. Hydraulic rod; 8. Mounting plate; 9. Rotating motor; 10. Rotating shaft; 11. Rotating block; 12. Flaring rod; 13. Sliding sleeve; 14. Block; 15. Connecting plate; 16. Lifting block; 17. Adjusting groove; 18. Bidirectional threaded rod; 19. Moving block; 20. Guide rod; 21. Guide block; 22. Moving plate; 23. Slide rod; 24. Pulling block; 25. Pulling rope; 26. Winding roller; 27. Rotating rod; 28. Worm gear; 29. Bidirectional worm; 30. Chute; 31. Support plate; 32. Spring. Detailed implementation mode

[0024] In order to make the technical means, creative features, achieved purposes and effects realized by the present utility model easy to understand, the present utility model will be further described below in conjunction with specific embodiments. However, the following embodiments are only the preferred embodiments of the present utility model and not all of them. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work all belong to the protection scope of the present utility model.

[0025] Embodiment

[0026] Please refer to Figures 1-3As shown in the figure, the utility model provides a pipe flaring device for PVC pipe production, which includes a base 1. A support base 5 is fixedly installed on the bottom surface of the base 1. An installation plate 8 is arranged inside the support base 5. A flaring assembly for flaring the PVC pipe is arranged on the bottom surface of the installation plate 8. The flaring assembly is composed of a rotating motor 9, a rotating shaft 10, a rotating block 11, a connecting plate 15 and a flaring rod 12. Among them, the rotating motor 9 is fixedly installed on the bottom surface of the installation plate 8. The output end of the rotating motor 9 is connected to the rotating shaft 10. The bottom end of the rotating shaft 10 is fixedly connected with the rotating block 11. A connecting plate 15 is arranged on the bottom surface of the rotating block 11. The bottom surfaces of the two connecting plates 15 are respectively fixedly connected with the flaring rods 12. An adjusting assembly for adjusting the distance between the two flaring rods 12 is arranged inside the flaring assembly. The adjusting assembly is composed of an adjusting groove 17, a bidirectional threaded rod 18, a moving block 19, a guide rod 20 and a guide block 21. Among them, the two adjusting grooves 17 are symmetrically opened on the bottom surface of the rotating block 11. And the bidirectional threaded rod 18 and the guide rod 20 are respectively arranged inside the two adjusting grooves 17. The bidirectional threaded rod 18 passes through the two moving blocks 19. The guide rod 20 passes through the two guide blocks 21. And the bidirectional threaded rod 18 is threadedly connected with the two moving blocks 19. And the two sections of the thread of the bidirectional threaded rod 18 are arranged in the opposite direction. Thus, by rotating the bidirectional threaded rod 18, the two moving blocks 19 can be driven to move relatively or away from each other. The moving block 19 and the guide block 21 are fixedly connected with the connecting plate 15. Therefore, when the bidirectional threaded rod 18 drives the moving block 19 to move, the moving block 19 can drive the guide block 21 to slide on the guide rod 20 through the connecting plate 15, so as to ensure the stability and directivity when the connecting plate 15 and the flaring rod 12 move. A lifting assembly for lifting the flaring assembly is arranged inside the support base 5. The lifting assembly is composed of a lifting groove 6, a hydraulic rod 7 and a lifting block 16. Among them, the two lifting blocks 16 are fixedly connected with the installation plate 8. The two lifting grooves 6 are symmetrically opened on one side of the support base 5. And the lifting block 16 is placed inside the lifting groove 6 and is slidably connected with it. Thus, when the installation plate 8 rises or falls, the lifting block 16 can slide inside the lifting groove 6, so as to ensure the smoothness when the installation plate 8 moves. The hydraulic rod 7 is fixedly installed on the top surface of the support base 5. And one end of the hydraulic rod 7 extends into the inside of the support base 5. And the telescopic end is connected to the top surface of the installation plate 8. Thus, by driving the hydraulic rod 7, the hydraulic rod 7 can drive the installation plate 8 to rise or move down. When the installation plate 8 moves, it can drive the flaring assembly on the bottom surface to move down. A positioning column 2 for positioning the PVC pipe to be flared is fixedly installed on the top surface of the base 1;

[0027] When using this device, place the device at the designated position, slip the PVC pipe to be flared over the positioning post 2, and make the flared end face the two flaring rods 12. Start the hydraulic rod 7. The hydraulic rod 7 drives the mounting plate 8 to move downward. The mounting plate 8 drives the flaring rods 12 in the flaring assembly to move downward. Move the two flaring rods 12 into the interior of the pipe. Rotate the bidirectional threaded rod 18. The bidirectional threaded rod 18 drives the two moving blocks 19 to move relatively or away from each other. The two moving blocks 19 drive the connecting plate 15 to move. The connecting plate 15 drives the two flaring rods 12 to move relatively or away from each other. Adjust the distance between the two flaring rods 12 to the diameter required for flaring. Drive the rotating motor 9. The rotating motor 9 rotates through the rotating shaft 10. The rotating shaft 10 drives the rotating block 11 to rotate. The rotating block 11 drives the flaring rod 12 to perform a circular motion along the inner wall of the pipe, thereby flaring the pipe;

[0028] As a further implementation of this embodiment, such as Figure 1 , Figure 4 and Figure 5As shown in the figure, the inside of the base 1 is hollow, and positioning components are arranged on both sides of the positioning column 2. The positioning components are composed of a resisting block 14, a sliding rod 23, a moving plate 22, a pulling block 24, a pulling rope 25, a winding roller 26, a rotating rod 27 and a bidirectional worm 29. Among them, the two moving plates 22 are symmetrically arranged inside the positioning column 2. One side of the moving plate 22 is fixedly connected with a sliding rod 23, and one end of the sliding rod 23 penetrates through the positioning column 2 and extends outward for a certain distance, and the extended end is fixedly connected with a resisting block 14. The bottom surface of the moving plate 22 extends into the inside of the base 1 for a certain distance, and the extended end face is fixedly connected with a pulling block 24. The pulling block 24 is placed inside the base 1. One side of the two pulling blocks 24 is fixedly connected with a pulling rope 25. One end of the pulling rope 25 is wound around the outer surface of the winding roller 26. One side of the two winding rollers 26 is fixedly connected with a rotating rod 27. One end of the two rotating rods 27 is fixedly connected with a worm gear 28. One side of the two worm gears 28 is meshed with a bidirectional worm 29. The two threads of the bidirectional worm 29 are arranged in opposite directions. Thus, by rotating the bidirectional worm 29, the bidirectional worm 29 can drive the two worm gears 28 to rotate in opposite directions. The two worm gears 28 can drive the winding roller 26 to wind the pulling rope 25 through the rotating rod 27. During the winding process of the pulling rope 25, the moving plate 22 can be pulled through the pulling block 24. In this way, the two moving plates 22 can move in opposite directions. When the two moving plates 22 move, the resisting blocks 14 can be driven to move synchronously to both sides through the sliding rods 23. When in use, after the pipe is sleeved on the outside of the positioning column 2, the two sliding rods 23 drive the two resisting blocks 14 to move synchronously. When the two resisting blocks 14 abut against the inner wall of the pipe, since the outer surface of the resisting block 14 and the inner wall of the pipe are both arc-shaped, when the resisting block 14 initially contacts the inner wall of the pipe, there is still a part of the resisting block 14 that does not contact the inner wall of the pipe. At this time, the moving plate 22 can continue to move until the resisting block 14 is completely attached to the inner wall of the pipe. When the two resisting blocks 14 are completely attached to the inner wall of the pipe, the distance between the two resisting blocks 14 is actually the diameter of the inner diameter of the pipe. At this time, the center of the pipe is the center of the positioning column 2, which is convenient for positioning it and facilitates the subsequent insertion of the flaring rod 12 into the inside of the pipe. The outer surface of the positioning column 2 is symmetrically connected with sliding sleeves 13, and the sliding rod 23 penetrates through the inside of the sliding sleeve 13 and is slidably connected with it. In this way, the sliding direction of the sliding rod 23 can be restricted, and the stability of the sliding of the sliding rod 23 is increased. The inside of the base 1 is symmetrically provided with support plates 31, and the winding roller 26 is fixedly installed on one side of the support plate 31 through a support frame. Two chutes 30 are opened in the inside of the base 1, and a slider is also fixedly installed on the bottom surface of the moving plate 22, and the slider is placed inside the chute and is slidably connected with it. In this way, when the moving plate 22 moves, the slider can slide inside the chute 30, and the stability of the movement of the moving plate 22 is increased. The outer surface of the base 1 is fixedly installed with a driving shell 3, and a positioning motor 4 is fixedly installed on the outer surface of the driving shell 3 through a fixing frame, and the output end of the positioning motor 4 is connected with the bidirectional worm 29.Thus, by driving the positioning motor 4, the positioning motor 4 can drive the bidirectional worm 29 to rotate. Springs 32 are symmetrically connected to one side of the two moving plates 22, and the other ends of the springs 32 are connected to one side of the support plate 31. When the moving plate 22 drives the slide bar 23 and the abutting block 14 to move, the springs 32 can be squeezed inward. After the pipe is removed from the outside of the positioning column 2, the pulling rope 25 on the outside of the winding roller 26 can be unreeled. At this time, the length of the outside of the pulling rope 25 is extended. When the moving plate 22 is not subjected to the pulling force of the pulling rope 25, the spring 32 can push the moving plate 22 back to its original position according to its own reaction force. When the moving plate 22 is reset, it can drive the slide bar 23 and the abutting block 14 to reset, thus facilitating the next use;

[0029] It should be noted that the position of the center of the positioning column 2 of this device always coincides with the center of the rotating block 11, and the distances of the two flaring rods 12 from the center of the rotating block 11 are the same. Therefore, after the PVC pipe is positioned outside the positioning column 2, the center of the pipe, the center of the positioning column 2, and the center of the rotating block 11 are on the same horizontal line. At this time, when the flaring rods 12 are inserted into the inside of the pipe, the distances between the two flaring rods 12 and the inner wall of the pipe are the same. Thus, when adjusting the distance between the two flaring rods 12, the two flaring rods 12 can simultaneously contact the inner wall of the pipe, thereby increasing the flaring effect. In addition, lubricants are applied to the outer surfaces of the two abutting blocks 14 of this device. Thus, when the abutting blocks 14 contact the inner wall of the pipe, the contact surface can be offset in the diameter direction of the inner diameter of the pipe through the lubrication effect until the two abutting blocks 14 contact the diameter surface of the inner diameter of the pipe, thus facilitating the positioning of the pipe;

[0030] When further using this device, the PVC pipe to be flared is sleeved outside the positioning column 2. The positioning motor 4 is started, and the positioning motor 4 drives the bidirectional worm 29 to rotate. The bidirectional worm 29 drives the two worm wheels 28 to rotate. The two worm wheels 28 drive the winding roller 26 to rotate through the rotating rod 27. The winding roller 26 drives the pulling rope 25 to be wound, thereby shortening the length of the pulling rope 25 on the outside. At this time, the pulling rope 25 drives the two moving plates 22 to move in opposite directions. The moving plate 22 drives the abutting block 14 to move synchronously to both sides through the slide bar 23. When the abutting block 14 contacts the inner wall of the pipe, the pipe can be positioned outside the positioning column 2. After the pipe is flared, by reversing the positioning motor 4, the winding roller 26 can be unreeled, so that the length of the pulling rope 25 on the outside can be extended, and the pulling rope 25 no longer applies a pulling force to the moving plate 22. At this time, the spring 32 can push the moving plate 22 back to its original position through the reaction force. The moving plate 22 drives the abutting block 14 to return to its original position through the slide bar 23, facilitating the next use;

[0031] Specific working principle: Place this device at the designated position, put the PVC pipe to be flared on the outside of the positioning column 2, start the positioning motor 4, the positioning motor 4 drives the bidirectional worm 29 to rotate, the bidirectional worm 29 drives the two worm wheels 28 to rotate, and the two worm wheels 28 drive the winding roller 26 through the rotating rod 27 to wind. The winding roller 26 drives the pulling rope 25 to pull the moving plate 22, and the two moving plates 22 drive the abutting blocks 14 to move synchronously to both sides through the sliding rod 23 until the abutting blocks 14 contact the inner wall of the pipe. Start the hydraulic rod 7, the hydraulic rod 7 drives the mounting plate 8 to move downward, and the mounting plate 8 drives the flaring rod 12 in the flaring assembly to move downward. Move the two flaring rods 12 to the inside of the pipe. Rotate the bidirectional threaded rod 18, the bidirectional threaded rod 18 drives the two moving blocks 19 to move relatively or away from each other, and the two moving blocks 19 drive the two flaring rods 12 to move to both sides through the connecting plate 15, and adjust the distance between the two flaring rods 12 to the diameter required for flaring. Start the rotating motor 9, the rotating motor 9 drives the rotating block 11 to rotate, the rotating block 11 drives the two flaring rods 12 to rotate, and the flaring rods 12 rotate to flare the pipe.

[0032] The above shows and describes the basic principle, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present utility model and are not used to limit the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A pipe expansion device for PVC pipe production, comprising a base (1), characterized in that: A support seat (5) is fixedly mounted on the top surface of the base (1), a lifting assembly is provided on the inner side of the support seat (5), one end of the lifting assembly is fixedly connected to a mounting plate (8), a flaring assembly for flaring a PVC pipe is provided on the bottom surface of the mounting plate (8), an adjustment assembly is provided on the inner side of the flaring assembly, a positioning column (2) is fixedly mounted at the center of the top surface of the base (1), and positioning assemblies are provided on both sides of the positioning column (2).

2. A pipe expanding device for PVC pipe production according to claim 1, characterized in that: The positioning assembly is composed of a stop block (14), a slide bar (23), a movable plate (22), a pull block (24), a pull rope (25), a winding roller (26), a rotating rod (27), a worm wheel (28) and a bidirectional worm (29). The two slide bars (23) are arranged on both sides of the positioning column (2), and one end of the slide bar (23) is fixedly connected to the stop block (14), and the stop block (14) is placed on the outside of the positioning column (2). The other ends of the two slide bars (23) are fixedly connected to the movable plate ( 22), a pull block (24) is fixedly connected at the center of one side of the two movable plates (22), a pull rope (25) is fixedly connected inside the two pull blocks (24), one end of the two pull ropes (25) is wound around the outer surface of the winding roller (26), one side of the two winding rollers (26) is fixedly connected with a rotating rod (27), one end of the two rotating rods (27) is fixedly connected with a worm gear (28), and one side of the two worm gears (28) is meshedly connected with a bidirectional worm (29).

3. A pipe expanding device for PVC pipe production according to claim 2, characterized in that: A support plate (31) is symmetrically arranged inside the base (1), and the winding roller (26) is fixedly mounted on one side of the support plate (31) via a fixing frame; one side of the two movable plates (22) is symmetrically connected with a spring (32), and the other end of the spring (32) is connected to the support plate (31); a sliding sleeve (13) is symmetrically arranged on the outer surface of the positioning column (2), and the sliding rod (23) is inserted into the sliding sleeve (13).

4. A pipe expanding device for PVC pipe production according to claim 2, characterized in that: The base (1) is symmetrically provided with sliding grooves (30), and the bottom surfaces of the two movable plates (22) are fixedly connected with sliding blocks, which are placed inside the sliding grooves (30) and slidably connected thereto.

5. A pipe expanding device for PVC pipe production according to claim 2, characterized in that: A drive housing (3) is fixedly mounted on one side of the base (1), a positioning motor (4) is fixedly mounted on the outer surface of the drive housing (3) via a fixing frame, and an output end of the positioning motor (4) is connected to a bidirectional worm gear (29).

6. A pipe expanding device for PVC pipe production according to claim 1, characterized in that: The lifting assembly is composed of a lifting groove (6), a hydraulic rod (7) and a lifting block (16); the two lifting grooves (6) are symmetrically arranged on one side of the support seat (5); the hydraulic rod (7) is fixedly mounted on the top surface of the support seat (5); the bottom end of the hydraulic rod (7) is connected to the top surface of the mounting plate (8); the two lifting blocks (16) are fixedly connected to one side of the mounting plate (8); and the two lifting blocks (16) are respectively placed inside the two lifting grooves (6) and are slidably connected thereto.

7. A pipe expanding device for PVC pipe production according to claim 1, characterized in that: The flaring assembly is composed of a rotating motor (9), a rotating shaft (10), a rotating block (11), a connecting plate (15) and a flaring rod (12); the rotating motor (9) is fixedly mounted on the bottom surface of the mounting plate (8); the output end of the rotating motor (9) is connected to the rotating shaft (10); the bottom end of the rotating shaft (10) is fixedly connected to the rotating block (11); the bottom surface of the rotating block (11) is provided with two connecting plates (15); the bottom surfaces of the two connecting plates (15) are fixedly connected to the flaring rod (12).

8. A pipe expanding device for PVC pipe production according to claim 7, characterized in that: The adjustment assembly is composed of an adjustment groove (17), a bidirectional threaded rod (18), a moving block (19), a guide rod (20) and a guide block (21); the two adjustment grooves (17) are symmetrically arranged on the bottom surface of the rotating block (11); the bidirectional threaded rod (18) and the guide rod (20) are respectively arranged inside the two adjustment grooves (17); the moving block (19) is penetrated by the bidirectional threaded rod (18); the guide block (21) is penetrated by the guide rod (20); and the guide block (21) and the moving block (19) are fixedly connected to the connecting plate (15).

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