On-line expanding and reducing device for PVC-O pipe

Abstract

The embodiment of the invention provides a PVC-O pipe online expanding and reducing device, and relates to the technical field of pipe production equipment. The PVC-O pipe online expanding and reducing device comprises a connecting pipe, a sleeve, an expanding plate, an adjusting mechanism and a driving assembly. The connecting pipe is used for being connected with the joint of an outlet of an extruder. The sleeve is rotatably arranged on the connecting pipe in a sleeving mode. And the expanding plate is movably connected to the sleeve. The adjusting mechanism is arranged between the sleeve and the diameter expanding plate so as to adjust the position of the diameter expanding plate in the radial direction of the connecting pipe. The driving assembly is in transmission connection with the sleeve so as to drive the sleeve to drive the expanding plate to rotate in the circumferential direction. The radial size of the expanding die head can be changed, so that one expanding die head can be used for producing various PVC-O pipes with different inner diameters, the production efficiency can be improved, and the cost can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe production equipment, in particular to a PVC-O pipe online expansion reducing device. BACKGROUND

[0002] PVC-O pipe is a kind of PVC pipe, which has high strength, high toughness, low temperature resistance, corrosion resistance and other characteristics, and is widely used in municipal water supply and drainage, agricultural irrigation, mine pipeline and other fields.

[0003] In the prior art, PVC-O pipe is generally manufactured by a biaxial stretching process. First, an extruder is used to make PVC-U pipe, and then axial and radial stretching is performed under high elasticity. By external force, the long-chain molecules of PVC are changed from disordered arrangement to biaxial regular arrangement to form a network structure. The existing "online" one-step processing method continuously performs orientation on the extrusion production line, greatly improving production efficiency and reducing cost.

[0004] However, in order to produce PVC-O pipes with different inner diameters in the prior art, many expansion die heads need to be prepared, which is relatively high in cost. In addition, when producing PVC-O pipes of different specifications, the expansion die head needs to be replaced, which also affects the production efficiency. SUMMARY

[0005] The purpose of the present application includes providing a PVC-O pipe online expansion reducing device, the radial size of which can be changed, so that one set of expansion die head can produce PVC-O pipes with different inner diameters, thereby improving production efficiency and reducing cost.

[0006] Embodiments of the present application can be implemented as follows: The present application provides a PVC-O pipe online expansion reducing device, which comprises a connecting pipe, a sleeve, an expansion plate, an adjusting mechanism and a driving assembly. The connecting pipe is used to connect the outlet of the extruder. The sleeve is rotatably sleeved on the connecting pipe. The expansion plate is movably connected to the sleeve. The adjusting mechanism is arranged between the sleeve and the expansion plate to adjust the position of the expansion plate in the radial direction of the connecting pipe. The driving assembly is in transmission connection with the sleeve to drive the sleeve to rotate the expansion plate in the circumferential direction.

[0007] In an optional embodiment, the PVC-O pipe online expansion reducing device further comprises a connecting rod. The expansion plate is hingedly connected to the sleeve through at least two connecting rods in the axial direction of the connecting pipe. The adjusting mechanism is in transmission connection with the connecting rod, and can drive the connecting rod to rotate, and drive the diameter expansion plate to move in the radial direction of the connecting pipe.

[0008] In an optional embodiment, the online diameter expansion device for the PVC-O pipe further comprises a reset torsion spring. The driving assembly comprises an adjusting ring and a driving member The adjusting ring is movably sleeved on the sleeve pipe and abuts against the inner wall of the connecting rod. The driving member is connected with the sleeve pipe and the adjusting ring to drive the adjusting ring to move towards the direction of approaching or moving away from the hinged side of the connecting rod and the sleeve pipe. The reset torsion spring is arranged at the hinge between the connecting rod and the sleeve pipe, and one end of the reset torsion spring acts on the sleeve pipe and the other end acts on the connecting rod to apply an inward elastic force to the connecting rod. When the driving member drives the adjusting ring to move towards the direction of approaching the hinged side of the connecting rod and the sleeve pipe, the adjusting ring can push the connecting rod to rotate outwardly to drive the diameter expansion plate to move outwardly in the radial direction of the connecting pipe. When the driving member drives the adjusting ring to move towards the direction of moving away from the hinged side of the connecting rod and the sleeve pipe, the reset torsion spring can push the connecting rod to rotate inwardly to drive the diameter expansion plate to move inwardly in the radial direction of the connecting pipe.

[0009] In an optional embodiment, the driving member is an electric push rod, one end of the electric push rod is connected with the sleeve pipe, and the other end is connected with the adjusting ring. and / or, The driving assembly comprises a motor, a gear and a gear ring, the motor is fixedly arranged relative to the connecting pipe, the gear ring is fixedly arranged relative to the sleeve pipe, the gear is arranged on the output shaft of the motor and is in meshing connection with the gear ring, and the side wall of the connecting pipe corresponding to the motor is provided with a threading hole for the wire to pass out of the threading hole.

[0010] In an optional embodiment, the connecting rod is arranged to be inclined towards the direction of moving the pipe, and the diameter expansion plate is connected with the connecting rod at the end on the pipe entering side. Alternatively, the end of the diameter expansion plate on the pipe entering side is provided with a guide plate.

[0011] In an optional embodiment, the online diameter expansion device for the PVC-O pipe further comprises a tapered die head. The tapered die head has a connecting portion for connecting with the outlet of the extruder, and a tapered expansion surface of the tapered die head is used for expanding the inner diameter of the passing pipe. The connecting pipe is connected with one end of the conical die away from the connecting part.

[0012] In an optional embodiment, the conical die is provided with a plurality of conical expansion sections at an axial interval, and the maximum diameters of the conical expansion sections increase in sequence in a direction away from the connecting part.

[0013] In an optional embodiment, the PVC-O pipe online expansion reducing device further comprises a sealing assembly connected to one side of the connecting pipe away from the conical die, and the sealing assembly can abut and seal with the inner wall of the pipe. The conical die is provided with a vent hole in an axial direction, and the side wall of the conical die is provided with an exhaust hole in communication with the vent hole.

[0014] In an optional embodiment, the conical die is provided with a boss near one end of the connecting pipe, and the diameter of the boss is smaller than the maximum diameter of the conical expansion section near the boss. The connecting pipe is connected to the boss. The outer periphery of the boss is provided with a plurality of ring grooves, and the exhaust hole is provided corresponding to the ring grooves.

[0015] In an optional embodiment, the sealing assembly comprises a mounting seat and an air bag, the mounting seat is provided with an air bag clamping ring groove at the periphery, the air bag is mounted in the air bag clamping ring groove, the mounting seat is provided with a mounting channel in an axial direction, the mounting seat is provided with an air valve connected with the air bag corresponding to the inner side of the mounting channel, the mounting seat is mounted in the connecting pipe through the mounting channel, and the connecting pipe is provided with an air pipe connected with the air valve, and the air pipe is used to be connected with a gas supply device to inflate the air bag.

[0016] The PVC-O pipe online expansion reducing device provided by the embodiment of the application has the following beneficial effects: The PVC-O pipe online expansion reducing device provided by the application comprises a connecting pipe, a sleeve, a diameter expansion plate, an adjusting mechanism and a driving assembly. In use, the connecting pipe is connected with the connecting part at the outlet of the extruder. The sleeve is rotatably sleeved on the connecting pipe, the diameter expansion plate is movably connected to the sleeve, the adjusting mechanism is arranged between the sleeve and the diameter expansion plate to adjust the position of the diameter expansion plate in the radial direction of the connecting pipe, and the driving assembly is drivingly connected with the sleeve to drive the sleeve to rotate the diameter expansion plate in the circumferential direction. Thus, when the diameter is expanded in the radial direction, the diameter expansion plate can be adjusted to the corresponding position according to the inner diameter specification of the PVC-O pipe to be produced. When the pipe passes through, the rotating diameter expansion plate can expand the pipe in the radial direction. Thus, the PVC-O pipe online expansion reducing device can meet the radial expansion requirements of pipes with different inner diameters, and multiple sets of diameter expansion dies do not need to be prepared, which can reduce the cost and improve the production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative effort.

[0018] Figure 1 The structure schematic diagram of the online expansion reducing device for PVC-O pipe provided in the present embodiment is shown in the figure. Figure 2 The structure schematic diagram of the conical die of the online expansion reducing device for PVC-O pipe provided in the present embodiment is shown in the figure. Figure 3 The structure schematic diagram of the partial section of the online expansion reducing device for PVC-O pipe provided in the present embodiment is shown in the figure. Figure 4 The installation schematic diagram of the motor of the online expansion reducing device for PVC-O pipe provided in the present embodiment is shown in the figure. Figure 5 The installation schematic diagram of the expansion plate of the online expansion reducing device for PVC-O pipe provided in the present embodiment is shown in the figure. Figure 6 The installation schematic diagram of the expansion plate of the online expansion reducing device for PVC-O pipe provided in the present embodiment is shown in the figure. Figure 7 The structure schematic diagram of the sealing assembly of the expansion plate of the online expansion reducing device for PVC-O pipe provided in the present embodiment is shown in the figure. Figure 8 The structure schematic diagram of the sealing assembly of the expansion plate of the online expansion reducing device for PVC-O pipe provided in the present embodiment is shown in the figure.

[0019] Figure legend: 101-conical die; 102-exhaust hole; 103-connection part; 104-first conical surface; 105-second conical surface; 201-connection pipe; 202-motor; 203-gear; 301-mounting base; 302-limiting plate; 303-air bag; 304-air valve; 401-sleeve; 402-ring table; 403-tooth ring; 404-connection rod; 405-expansion plate; 406-adjusting ring; 407-electric push rod. DETAILED DESCRIPTION

[0020] However, in order to produce PVC-O pipes with different inner diameters, many expansion dies need to be prepared in the prior art, which is high in cost. In addition, the expansion dies also need to be replaced when producing PVC-O pipes with different specifications, which will also affect the production efficiency.

[0021] In order to solve the above problems, the application provides a PVC-O pipe on-line expansion reducing device, the radial dimension of which can be changed, so that one set of expansion die head can produce PVC-O pipes with different inner diameters, thereby improving production efficiency and reducing cost.

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will be a clear and complete description of the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0024] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0025] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the present application is used, only for the convenience of describing the present application and simplifying the description, and it is not intended to indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application.

[0026] In addition, if the terms "first", "second", and the like appear, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0027] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0028] The overall structure, working principle and technical effects of the PVC-O pipe on-line expansion reducing device provided by the present application will be described in detail below through embodiments and in conjunction with the drawings.

[0029] Please refer to Figure 1 The present embodiment provides a PVC-O pipe on-line expansion reducing device, which is applied to radial expansion in the production process of PVC-O pipes.

[0030] Please refer to Figures 1 to 8 In the embodiment, the PVC-O pipe online expanding and reducing device comprises a connecting pipe 201, a sleeve pipe 401, a diameter expanding plate 405, an adjusting mechanism and a driving assembly. The connecting pipe 201 is used to connect the outlet of the extruder. The sleeve pipe 401 is rotatably sleeved on the connecting pipe 201. The diameter expanding plate 405 is movably connected to the sleeve pipe 401. The adjusting mechanism is arranged between the sleeve pipe 401 and the diameter expanding plate 405 to adjust the position of the diameter expanding plate 405 in the radial direction of the connecting pipe 201. The driving assembly is drivingly connected to the sleeve pipe 401 to drive the sleeve pipe 401 to drive the diameter expanding plate 405 to rotate in the circumferential direction.

[0031] The PVC-O pipe online expanding and reducing device provided in the embodiment comprises a connecting pipe 201, a sleeve pipe 401, a diameter expanding plate 405, an adjusting mechanism and a driving assembly. In use, the connecting pipe 201 is connected to the outlet of the extruder. Since the sleeve pipe 401 is rotatably sleeved on the connecting pipe 201 and the diameter expanding plate 405 is movably connected to the sleeve pipe 401, the adjusting mechanism is arranged between the sleeve pipe 401 and the diameter expanding plate 405 to adjust the position of the diameter expanding plate 405 in the radial direction of the connecting pipe 201, and the driving assembly is drivingly connected to the sleeve pipe 401 to drive the sleeve pipe 401 to drive the diameter expanding plate 405 to rotate in the circumferential direction. Thus, when the diameter is expanded in the radial direction, the diameter expanding plate 405 can be adjusted to the corresponding position through the adjusting mechanism according to the inner diameter specification of the PVC-O pipe to be produced. When the pipe passes through, the rotating diameter expanding plate 405 can expand the pipe in the radial direction. Thus, the PVC-O pipe online expanding and reducing device can meet the radial expansion requirements of pipes with different inner diameters, and multiple sets of diameter expanding dies do not need to be prepared, which can reduce the cost and improve the production efficiency.

[0032] Please refer to Figures 1 to 8 Further, the PVC-O pipe online expanding and reducing device further comprises connecting rods 404. The diameter expanding plate 405 is hingedly connected to the sleeve pipe 401 in the axial direction of the connecting pipe 201 through at least two connecting rods 404. The adjusting mechanism is drivingly connected to the connecting rods 404 to drive the connecting rods 404 to rotate and drive the diameter expanding plate 405 to move in the radial direction of the connecting pipe 201.

[0033] Since the diameter expanding plate 405 is hingedly connected to the sleeve pipe 401 in the axial direction of the connecting pipe 201 through at least two connecting rods 404, a four-link structure can be formed, the connecting structure is simple, and the adjustment of the position of the diameter expanding plate 405 can be conveniently realized.

[0034] Specifically, the axis of the diameter expanding plate 405 is parallel to the axis of the connecting pipe 201, so that the diameter expanding plate 405 can rotate around the axis of the connecting pipe 201 as the rotation axis to sweep out a cylindrical surface to achieve the diameter expansion. The adjustment of the position of the diameter expanding plate 405 can change the diameter of the swept-out cylindrical surface.

[0035] Further, the plurality of groups of the diameter expansion plates 405 are arranged at equal central angles around the circumference of the sleeve 401, for example, 6 groups, 8 groups or even more.

[0036] The two ends of the diameter expansion plates 405 in the length direction are respectively hinged with the connecting rods 404, and the other ends of the connecting rods 404 are hinged with the sleeve 401, so as to form a parallelogram structure, and the position of the diameter expansion plates 405 can be changed by adjusting the inclination angles of the two connecting rods 404.

[0037] Please refer to Figures 1 to 8 Further, the online diameter expansion device for the PVC-O pipe further comprises a reset torsion spring. The driving assembly comprises an adjusting ring 406 and a driving member. The adjusting ring 406 is movably sleeved on the sleeve 401 and abuts against the inner wall of the connecting rod 404. The driving member is connected with the sleeve 401 and the adjusting ring 406 to drive the adjusting ring 406 to move towards the direction of approaching or moving away from the hinged side of the connecting rod 404 and the sleeve 401. The reset torsion spring is arranged at the hinged position of the connecting rod 404 and the sleeve 401, and one end of the reset torsion spring acts on the sleeve 401 and the other end acts on the connecting rod 404 to apply an inward elastic force to the connecting rod 404. When the driving member drives the adjusting ring 406 to move towards the direction of approaching the hinged side of the connecting rod 404 and the sleeve 401, the adjusting ring 406 can push the connecting rod 404 to rotate outward to drive the diameter expansion plates 405 to move outward in the radial direction of the connecting pipe 201. When the driving member drives the adjusting ring 406 to move towards the direction of moving away from the hinged side of the connecting rod 404 and the sleeve 401, the reset torsion spring can push the connecting rod 404 to rotate inward to drive the diameter expansion plates 405 to move inward in the radial direction of the connecting pipe 201.

[0038] In the embodiment, the reset torsion spring can make the side wall of the connecting rod 404 abut against the adjusting ring 406, so as to keep the inclination angle at a specific angle, and realize the reset of the connecting rod 404 driving the diameter expansion plates 405 when the diameter is adjusted to be small. The reset torsion spring can also avoid the influence of the centrifugal force on the diameter expansion plates 405 during the rotation of the sleeve 401 driving the diameter expansion plates 405.

[0039] Please refer to Figures 1 to 8 Further, the number of the adjusting rings 406 is at least two to act on the inner sides of the two connecting rods 404 of the diameter expansion plates 405, so as to support the two connecting rods 404 and make the inclination angles of the two connecting rods 404 the same, thereby avoiding the problem of the diameter expansion plates 405 not being parallel. The two adjusting rings 406 can be connected by bolts to realize synchronous movement.

[0040] In the embodiment, the driving member is an electric push rod 407, one end of the electric push rod 407 is connected with the sleeve 401, and the other end is connected with the adjusting ring 406.

[0041] The driving member is an electric push rod 407 in this embodiment, which can quickly and precisely adjust the position of the adjusting ring 406.

[0042] It should be noted that a side hole can be arranged on the side wall of the connecting pipe 201, and the wire is extended from the end of the connecting pipe 201 and then extended out of the side hole to be connected to the electric push rod 407.

[0043] In some other embodiments of the present application, the driving member can also be replaced by a telescopic driving member such as a pneumatic cylinder.

[0044] Please refer to Figures 1 to 8 In this embodiment, the driving assembly includes a motor 202, a gear 203 and a gear ring 403. The motor 202 is fixedly arranged relative to the connecting pipe 201, the gear ring 403 is fixedly arranged relative to the sleeve 401, and the gear 203 is arranged on the output shaft of the motor 202 and engaged with the gear ring 403. The side wall of the connecting pipe 201 corresponding to the motor 202 is provided with a threading hole for the wire to pass through.

[0045] In this embodiment, the motor 202, the gear 203 and the gear ring 403 can conveniently drive the sleeve 401 to rotate. Moreover, the cable of the motor 202 can also be extended into the connecting pipe 201 from the end and then extended out of the threading hole to be connected to the motor 202.

[0046] It should be further noted that the sleeve 401 can be rotatably installed on the outer periphery of the connecting pipe 201 through a bearing or a self-lubricating sleeve. The sleeve 401 is provided with a ring table 402 on one side, and the ring table 402 is provided with an installation hole at the end. The gear ring 403 is installed on the side wall of the installation hole. The side wall of the connecting pipe 201 is welded with a mounting seat 301, and the motor 202 is installed on the mounting seat 301. The gear 203 installed on the output shaft of the motor 202 extends into the gear ring 403 and is engaged with the teeth on the gear ring 403.

[0047] Further, the connecting rod 404 is arranged to be inclined to the direction in which the pipe moves, and the end of the diameter expansion plate 405 located on the pipe inlet side is connected to one connecting rod 404.

[0048] In this embodiment, the connecting rod 404 is arranged to be inclined to the direction in which the pipe moves, so that the pipe blank moves in the same direction as the inclination direction of the connecting rod 404. The pipe blank also exerts an inward constraint on the connecting rod 404, so that the connecting rod 404 can better adhere to the outer surface of the adjusting ring 406, and the connecting rod 404 will not be spread out during the rotation of the sleeve 401. Moreover, the end of the diameter expansion plate 405 located on the pipe inlet side is connected to one connecting rod 404, so that the rotation of the connecting rod 404 also expands the pipe blank in the radial direction, avoiding the problem that the pipe blank is pulled apart.

[0049] It should be noted that the connecting rod 404 arranged at the end of the expansion plate 405 located on the inlet pipe side has a swept surface in the form of a circular truncated cone when the sleeve pipe 401 rotates, and the diameter of the bottom surface is the same as the diameter of the cylindrical surface swept by the expansion plate 405.

[0050] In some other embodiments of the present application, a guide plate can be arranged at the end of the expansion plate 405 located on the inlet pipe side in a tilted manner. During the movement of the embryo pipe pulled by the traction machine, the guide plate can first expand the embryo pipe in the radial direction to realize the transition.

[0051] Please refer to Figures 1 to 8 Further, the online expansion and diameter changing device for PVC-O pipes also comprises a conical die head 101. The conical die head 101 has a connecting portion 103 for connecting with the outlet of the extruder, and the conical expansion surface of the conical die head 101 is used for expanding the inner diameter of the passing pipe. The connecting pipe 201 is connected with the end of the conical die head 101 away from the connecting portion 103.

[0052] In the present embodiment, the conical die head 101 is connected at the front end, and the embryo pipe can be first expanded in the radial direction by the conical expansion surface of the conical die head 101, and then expanded by the expansion plate 405. In this way, the radial expansion can be carried out in multiple steps, so that the expansion effect is better.

[0053] Please refer to Figures 1 to 8 Further, the conical die head 101 is provided with multiple conical expansion portions in the axial direction, and the maximum diameters of the conical expansion portions in the direction away from the connecting portion 103 increase successively.

[0054] In the present embodiment, the conical die head 101 is provided with multiple conical expansion portions in the axial direction, and the embryo pipe can be expanded successively by the multiple conical expansion portions when passing through, so that the radial expansion can be better realized.

[0055] In the present embodiment, the conical die head 101 is provided with two conical expansion portions in the axial direction. The side wall of the conical expansion portion located at the front side is formed with a first conical surface 104, and the side wall of the conical expansion portion located at the rear side is formed with a second conical surface 105. The diameter of the bottom surface of the second conical surface 105 is greater than that of the first conical surface 104.

[0056] In the present embodiment, the conical die head 101 is provided with a passage for passing through the electric wire and the gas supply pipe, and the passage is in communication with the connecting pipe 201. After the conical die head 101 is connected to the extruder, the electric wire and the gas supply pipe can be passed through.

[0057] Generally, the embryo pipe is heated and softened when the PVC-O pipe is expanded in the radial direction. After being heated and softened, the embryo pipe after expansion may have the problem of inward collapse.

[0058] Please refer to Figures 1 to 8In the embodiment, the on-line expanding and reducing device of the PVC-O pipe further comprises a sealing assembly connected to the connecting pipe 201 away from the conical die head 101, and the sealing assembly can abut and seal with the inner wall of the pipe. The conical die head 101 is provided with an air vent in the axial direction, and the sidewall of the conical die head 101 is provided with an exhaust hole 102 communicating with the air vent.

[0059] In the embodiment, the sealing assembly is provided, and the air vent and the exhaust hole 102 are provided in the die head, so that the embryo pipe cooperated between the sealing assembly and the conical die head 101 forms a sealed space, air is supplied to the exhaust hole 102 through the air vent, and the air is filled into the sealed cavity to form high pressure, so that the problem of internal collapse can be avoided.

[0060] In the embodiment, the conical die head 101 is provided with a boss near one end of the connecting pipe 201, and the diameter of the boss is smaller than the maximum diameter of the conical expanding part near the boss. The connecting pipe 201 is connected to the boss. The outer periphery of the boss is provided with a plurality of ring grooves, and the exhaust hole 102 is arranged corresponding to the ring grooves.

[0061] In the embodiment, the boss is provided, the diameter of the boss is smaller than the maximum diameter of the conical expanding part near the boss, the ring grooves are arranged on the boss, and the exhaust hole 102 is arranged corresponding to the ring grooves, so that the pipe wall of the embryo pipe can avoid blocking the exhaust hole 102.

[0062] Further, the sealing assembly comprises a mounting seat 301 and an air bag 303, the peripheral edge of the mounting seat 301 is provided with an air bag clamping ring groove, the air bag 303 is installed in the air bag clamping ring groove, the mounting seat 301 is provided with a mounting channel in the axial direction, the inner side of the mounting channel of the mounting seat 301 is provided with an air valve 304 connected with the air bag 303, the mounting seat 301 is installed in the connecting pipe 201 through the mounting channel, and the connecting pipe 201 is provided with an air pipe connected with the air valve 304, and the air pipe is used to be connected with a gas supply device to inflate the air bag 303.

[0063] In the embodiment, the mounting channel is arranged in the axial direction of the mounting seat 301, so that the gas supply pipeline can extend to the mounting seat 301 inside the connecting pipe 201, and be connected with the air bag 303.

[0064] In the embodiment, the two sides of the air bag clamping ring groove form a limiting plate 302, and the limiting plate 302 can limit the air bag 303, so that the air bag 303 can be prevented from being pulled out when the pipe is stretched and moved.

[0065] In summary, the PVC-O pipe online expanding and reducing device provided by the embodiment comprises a connecting pipe 201, a sleeve pipe 401, a diameter expanding plate 405, an adjusting mechanism and a driving assembly. In use, the connecting pipe 201 is connected with the connecting part of the outlet of the extruder. The sleeve pipe 401 is rotatably sleeved on the connecting pipe 201, and the diameter expanding plate 405 is movably connected with the sleeve pipe 401. The adjusting mechanism is arranged between the sleeve pipe 401 and the diameter expanding plate 405 to adjust the position of the diameter expanding plate 405 in the radial direction of the connecting pipe 201. The driving assembly is drivingly connected with the sleeve pipe 401 to drive the sleeve pipe 401 to drive the diameter expanding plate 405 to rotate in the circumferential direction. Thus, when the diameter is expanded in the radial direction, the diameter expanding plate 405 can be adjusted to the corresponding position through the adjusting mechanism according to the inner diameter specification of the PVC-O pipe to be produced. When the pipe passes through, the rotating diameter expanding plate 405 can expand the pipe in the radial direction. Thus, the PVC-O pipe online expanding and reducing device can meet the radial expansion requirement of pipes with different inner diameters, and a plurality of diameter expanding dies need not to be prepared, so that the cost can be reduced and the production efficiency can be improved.

[0066] The above merely provides a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which shall be covered within the protection scope of the present application.

Claims

1. An on-line expanding reducer for PVC-O tubing, characterized in that, The online expanding and reducing device for PVC-O pipe comprises a connecting pipe (201), a sleeve pipe (401), a diameter expanding plate (405), an adjusting mechanism and a driving assembly, the connecting pipe (201) is used for being connected with the outlet of an extruder; The sleeve pipe (401) is rotatably sleeved on the connecting pipe (201); The diameter expanding plate (405) is movably connected to the sleeve pipe (401); The adjusting mechanism is arranged between the sleeve pipe (401) and the diameter expanding plate (405) to adjust the position of the diameter expanding plate (405) in the radial direction of the connecting pipe (201); The driving assembly is drivingly connected with the sleeve pipe (401) to drive the sleeve pipe (401) to drive the diameter expanding plate (405) to rotate in the circumferential direction.

2. The on-line expansion sizing device for PVC-O tubing of claim 1, wherein, The online expanding and reducing device for PVC-O pipe further comprises a connecting rod (404); The diameter expanding plate (405) is hingedly connected to the sleeve pipe (401) through at least two connecting rods (404) in the axial direction of the connecting pipe (201); The adjusting mechanism is drivingly connected with the connecting rod (404) to drive the connecting rod (404) to rotate and drive the diameter expanding plate (405) to move in the radial direction of the connecting pipe (201).

3. The on-line expanding reducer of PVC-O tubing according to claim 2, characterized in that, The online expanding and reducing device for PVC-O pipe further comprises a reset torsion spring; The driving assembly comprises an adjusting ring (406) and a driving member; The adjusting ring (406) is movably sleeved on the sleeve pipe (401) and abuts against the inner wall of the connecting rod (404); The driving member is connected with the sleeve pipe (401) and the adjusting ring (406) to drive the adjusting ring (406) to move towards the hinge side of the connecting rod (404) and the sleeve pipe (401); The reset torsion spring is arranged at the hinge of the connecting rod (404) and the sleeve pipe (401), one end of the reset torsion spring acts on the sleeve pipe (401) and the other end acts on the connecting rod (404) to apply an inward elastic force to the connecting rod (404); When the driving member drives the adjusting ring (406) to move towards the hinge side of the connecting rod (404) and the sleeve pipe (401), the adjusting ring (406) can push the connecting rod (404) to rotate outward to drive the diameter expanding plate (405) to move outward in the radial direction of the connecting pipe (201); When the driving member drives the adjusting ring (406) to move away from the hinge side of the connecting rod (404) and the sleeve pipe (401), the reset torsion spring can push the connecting rod (404) to rotate inward to drive the diameter expanding plate (405) to move inward in the radial direction of the connecting pipe (201).

4. The on-line expansion sizing device for PVC-O tubing of claim 3, wherein, The driving member is an electric push rod (407), one end of the electric push rod (407) is connected with the sleeve pipe (401) and the other end is connected with the adjusting ring (406); And / or, The driving assembly comprises a motor (202), a gear (203) and a gear ring (403), the motor (202) is fixedly arranged relative to the connecting pipe (201), the gear ring (403) is fixedly arranged relative to the sleeve (401), the gear (203) is arranged on an output shaft of the motor (202) and is engaged with the gear ring (403), and a threading hole is arranged on a side wall of the motor (202) corresponding to the connecting pipe (201) to allow a wire to pass out of the threading hole.

5. The on-line expanding reducer of PVC-O tubing according to any one of claims 2-4, characterized in that, The connecting rod (404) is arranged to be inclined towards the moving direction of the pipe, and the end of the pipe expanding plate (405) on the pipe inlet side is connected with the connecting rod (404). Alternatively, the end of the pipe expanding plate (405) on the pipe inlet side is arranged to be inclined towards the guide plate.

6. The on-line expanding reducer of PVC-O tubing according to any one of claims 1-4, characterized in that, The PVC-O pipe online expanding and reducing device further comprises a conical die head (101). The conical die head (101) has a connecting portion (103) for connecting with the outlet of the extruder, and a conical expanding surface of the conical die head (101) is used for expanding the inner diameter of the passing pipe. The connecting pipe (201) is connected with one end of the conical die head (101) away from the connecting portion (103).

7. The on-line expanding reducer of PVC-O tubing as claimed in claim 6, characterized in that, The conical die head (101) is arranged with a plurality of conical expanding portions at intervals in the axial direction, and the maximum diameters of the conical expanding portions in the direction away from the connecting portion (103) gradually increase.

8. The on-line expanding reducer of PVC-O tubing of claim 7, characterized in that, The PVC-O pipe online expanding and reducing device further comprises a sealing assembly connected to one side of the connecting pipe (201) away from the conical die head (101), and the sealing assembly can abut and seal with the inner wall of the pipe. The conical die head (101) is arranged with a vent hole in the axial direction, and the side wall of the conical die head (101) is arranged with an exhaust hole (102) communicating with the vent hole.

9. The on-line expanding reducer of PVC-O tubing of claim 8, characterized in that, One end of the conical die head (101) close to the connecting pipe (201) is arranged with a boss, and the diameter of the boss is smaller than the maximum diameter of the conical expanding portion close to the boss. The connecting pipe (201) is connected with the boss. The outer periphery of the boss is arranged with a plurality of ring grooves, and the exhaust hole (102) is arranged corresponding to the ring grooves.

10. The on-line expanding reducer of PVC-O tubing of claim 8, wherein, The sealing assembly comprises a mounting seat (301) and an air bag (303), the outer periphery of the mounting seat (301) is arranged with air bag (303) clamping ring grooves, the air bag (303) is mounted in the air bag (303) clamping ring grooves, the mounting seat (301) is arranged with a mounting channel in the axial direction, the mounting seat (301) is arranged with an air valve (304) connected with the air bag (303) corresponding to the inner side of the mounting channel, the mounting seat (301) is mounted in the connecting pipe (201) through the mounting channel, and the connecting pipe (201) is arranged with an air pipe connected with the air valve (304), and the air pipe is used for connecting with a gas supply device to inflate the air bag (303).

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