Internal circle expanding device for PE (Poly Ethylene) pipeline

Abstract

The invention discloses a PE pipeline interior circle expanding device which comprises a circle expanding assembly and a controller, the circle expanding assembly comprises a shell and two end covers, a plurality of swing arm assemblies are arranged on the surface of the shell, a first expanding assembly is arranged in the shell, and the first expanding assembly is used for unfolding the swing arm assemblies; and the circle expanding assembly further comprises a taper sleeve, a moving assembly is arranged in the embedding groove, a second expanding assembly is arranged in the taper sleeve, the second expanding assembly is used for unfolding the moving assembly, and the moving assembly is driven by the second expanding assembly to make contact with the inner wall of the pipeline. The whole circle expanding assembly is driven by the moving assembly to move along the interior of the pipeline. The expansion amount of PE pipeline expansion is more accurate and controllable, the problem that the PE pipeline is damaged due to sudden increase of the expansion amount is avoided, the expansion assembly can conduct expansion operation in any straight pipe section of the PE pipeline, and the flexibility of practical application is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of PE pipelines, and specifically to an internal rounding device for PE pipelines. Background Art

[0002] A PE pipeline refers to a pipeline made of polyethylene material. PE is a thermoplastic plastic, and due to its excellent chemical stability, corrosion resistance, flexibility, and good impact resistance, it is widely used in fields such as water supply, drainage, gas transmission, agricultural irrigation, and industrial fluid transmission.

[0003] In the actual application of PE pipelines, when the PE pipeline needs to increase the flow rate, adapt to different pipeline connection requirements, or perform specific treatment processes, it is usually necessary to expand the inside of the PE pipeline to meet the actual application needs.

[0004] In the prior art, the publication number: CN112848250B, discloses a drum-type thermoplastic pipeline diameter expansion device, belonging to the field of pipeline construction. Its technical solution: an end cover is installed at the end of the rotating shaft, a sliding sleeve is installed in the middle of the rotating shaft, and the rotating shaft is installed on the base; one end of the mandrel is hinged to the end cover and can rotate radially along the end cover; the other end of the mandrel is hinged to the ejector rod, and the other end of the ejector rod is hinged to the sliding sleeve; the drum is sleeved on the mandrel, and the drum rotates freely relative to the mandrel; an adjustment mechanism is provided between the sliding sleeve and the base, and the adjustment mechanism adjusts the axial distance of the sliding sleeve relative to the base. The present invention solves the problems of low axial strength in the hot melt butt joint of existing thermoplastic pipelines and the presence of protruding annular residues at the connection part; the device is manually adjusted and constructed without other assisting equipment, which is convenient for field construction.

[0005] Based on the above-mentioned disclosed prior art, the expansion amount of the pipeline inner diameter increases in a stepped manner, and there is a certain difference between each expansion amount. If the difference is large and the pipe wall is thin, it is very easy to burst the pipeline. Secondly, when the expansion amount increases in a stepped manner, due to the sudden increase in the expansion amount, the contact force between the diameter expansion structure and the inner wall of the pipeline also increases suddenly, which will cause indentations on the inner wall of the pipeline due to the extrusion of the diameter expansion structure. At the same time, the sudden increase in the expansion amount will also cause a stretching phenomenon between the contact part of the diameter expansion structure and the pipe wall and the rest of the pipe wall, and the stretched part will have a problem of thinning of the pipe wall. The above-mentioned problems will affect the inner wall quality of the pipeline and the overall structure of the pipeline, thereby affecting the reliability of the actual application of the pipeline.

[0006] If the above problems are to be solved, it is necessary to reduce the expansion amount and increase the increase nodes of the expansion amount, but it still belongs to the technical essence of increasing the expansion amount in a stepped manner, that is, there is a problem of uneven increase in the expansion amount, and the above-mentioned technical problems cannot be solved.

[0007] Moreover, the above-mentioned existing technology can only expand the pipe orifice and cannot be applied to the part of the pipeline far from the pipe orifice, so there are certain limitations in practical applications. Secondly, during the diameter expansion process, the axis of the diameter expansion device and the pipeline need to be precisely adjusted. Otherwise, the axis of the expanded part and the unexpanded part of the pipeline will deviate. On the one hand, it will cause deviation in pipeline connection and cannot meet the actual use requirements; on the other hand, it will cause the problem of uneven wall thickness of the expanded part of the pipeline, which also cannot meet the actual use requirements.

[0008] Therefore, there are still many limitations and deficiencies in the above-mentioned existing technology in practical applications. Summary of the Invention

[0009] The purpose of the present invention is to provide an internal rounding device for PE pipelines to solve the problems raised in the above background technology.

[0010] To achieve the above purpose, the present invention provides the following technical solution: an internal rounding device for PE pipelines, including a rounding component and a controller, and the controller is installed inside the rounding component;

[0011] The rounding component includes a housing and two end covers, and both ends of the housing are rotatably installed on the surfaces of the end covers;

[0012] Toothed rings are arranged inside both ends of the housing, and one or more first motors are arranged on one side of the end cover, and the output end of the first motor meshes with the inner wall of the toothed ring;

[0013] A plurality of swing arm components are arranged on the surface of the housing, and a first expansion component is arranged inside the housing;

[0014] The swing arm component includes a crank, a roller and a rolling wheel. A plurality of rotating shafts are arranged on the surface of the housing. One end of the crank is rotatably installed on the surface of the rotating shaft, the roller is rotatably installed on the other end of the crank, and the rolling wheel is installed on the inner wall of the crank;

[0015] The first expansion component includes two propulsion components, a first screw rod and a second motor. The output end of the second motor is connected to the first screw rod. The two propulsion components are symmetrically and staggeredly distributed on the surface of the first screw rod, and the thread directions at both ends of the surface of the first screw rod are opposite;

[0016] The propulsion component includes a plurality of wedge-shaped blocks and a first screw sleeve. The inner wall of the first screw sleeve meshes with the surface of the first screw rod, and a plurality of wedge-shaped blocks are all installed on the surface of the first screw sleeve;

[0017] The rolling wheel is located at the intersection of the two propulsion components.

[0018] Preferably, the swing arm assembly further includes one or more torsion springs, both ends of the torsion spring are respectively connected to the surface of the crank and the surface of the housing, and the torsion spring is sleeved on the surface of the rotating shaft.

[0019] Preferably, a temperature sensor and a heating wire are arranged inside the roller, and the roller is filled with heat-conducting oil.

[0020] Preferably, the swing arm assembly further includes one or more second electric slip rings, and the second electric slip rings are installed at the rotational connection between the roller and the crank.

[0021] Preferably, a first electric slip ring is arranged at the rotational connection between the end cover and the housing.

[0022] Preferably, the propulsion assembly further includes one or more limiting rods, and one or more limiting holes are formed on the surface of the end cover, and the limiting rods are slidably inserted into the limiting holes.

[0023] Preferably, the circle-expanding assembly further includes one or more taper sleeves, a plurality of fitting grooves are formed on the surface of the taper sleeve, and a moving assembly is arranged inside the fitting grooves;

[0024] The moving assembly includes a hub motor and a support rod, a rubber sleeve is fixed on the outer wall of the hub motor, one end of the support rod is rotatably installed inside one side of the fitting groove, and the hub motor is installed inside the other end of the support rod.

[0025] Preferably, a second expansion assembly is arranged inside the taper sleeve, and the second expansion assembly includes a third motor, a second screw rod and a second nut;

[0026] The output end of the third motor is connected to the second screw rod, and the second nut is rotationally engaged with the surface of the second screw rod;

[0027] A linkage rod is rotatably connected between the second nut and the support rod.

[0028] Preferably, the circle-expanding assembly further includes a connecting seat, a traction rope and a wire harness are arranged inside the connecting seat, and a wire harness is arranged inside the traction rope;

[0029] A socket is arranged on the surface of the taper sleeve, and the socket is fitted with the connecting seat.

[0030] Preferably, the controller is electrically connected to the wire harness, and the controller is electrically connected to the first electric slip ring, the first motor, the hub motor, the second motor and the third motor respectively;

[0031] The first electric slip ring is electrically connected to the second electric slip ring, and the second electric slip ring is electrically connected to the temperature sensor and the heating wire respectively.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0033] 1. By setting the first expansion component, the present invention achieves the effect of accurately and controllably increasing the expansion amount. The first screw can drive the propulsion component to move at a constant speed, and the circular diameter formed at the intersection of the slopes of the two propulsion components also increases at a constant speed, so that the diameter of the rotation trajectory of the roller in the swing arm component also increases at a constant speed, realizing the effect of the expansion diameter of the swing arm component increasing at a constant speed, and further achieving the effect of increasing the expansion amount at a constant speed; moreover, the second motor can control the number of rotation turns of the first screw, that is, accurately control the positions of the two propulsion components, so as to achieve the effect of accurately controlling the expansion diameter of the swing arm component, which is beneficial to the accurate and controllable inner wall rounding operation of the pipeline.

[0034] 2. By setting the moving component and the second expansion component, the present invention achieves the effect of rounding different positions in the straight pipe section and preventing the problem of axis deviation. The second expansion component can drive multiple moving components to expand synchronously. By simultaneously contacting the inner wall of the pipeline with multiple moving components, the axis of the rounding component can be aligned with the axis of the pipeline, realizing the self-centering function of the rounding component and preventing the problem of eccentric rounding; secondly, the moving component can drive the rounding component to move flexibly along the straight pipe section of the pipeline, which is convenient for the staff to perform rounding operations on different positions in the straight pipe section and continuous rounding operations on the straight pipe section. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic diagram of the external structure of the rounding component in Embodiment 1 of the present invention;

[0036] Figure 2 is a schematic diagram of the main sectional structure of the rounding component in Embodiment 1 of the present invention;

[0037] Figure 3 is a schematic diagram of the exploded structure of the internal components of the housing in Embodiment 1 of the present invention;

[0038] Figure 4 is a schematic diagram of the exploded structure of the housing and the end cover in Embodiment 1 of the present invention;

[0039] Figure 5 is a schematic diagram of the side sectional structure of the swing arm component in Embodiment 1 of the present invention;

[0040] Figure 6 is a schematic diagram of the side view structure of the first motor in Embodiment 1 of the present invention;

[0041] Figure 7Schematic diagram of the external structure of the swing arm assembly in Embodiment 1 of the present invention;

[0042] Figure 8 Schematic diagram of the main sectional structure of the rotating roller in Embodiment 2 of the present invention;

[0043] Figure 9 Schematic diagram of the external structure of the first expansion assembly in the expanded state in Embodiment 1 of the present invention;

[0044] Figure 10 Schematic diagram of the front view structure of the first expansion assembly in the expanded state in Embodiment 1 of the present invention;

[0045] Figure 11 Schematic diagram of the external structure of the propulsion assembly in Embodiment 1 of the present invention;

[0046] Figure 12 Schematic diagram of the front view structure of the propulsion assembly in Embodiment 1 of the present invention;

[0047] Figure 13 Schematic diagram of the side view structure of the propulsion assembly in Embodiment 1 of the present invention;

[0048] Figure 14 Schematic diagram of the structure of the swing arm assembly in the contracted state in Embodiment 1 of the present invention;

[0049] Figure 15 Schematic diagram of the external structure of the first expansion assembly in the contracted state in Embodiment 1 of the present invention;

[0050] Figure 16 Schematic diagram of the front view structure of the first expansion assembly in the contracted state in Embodiment 1 of the present invention;

[0051] Figure 17 Schematic diagram of the structure of the swing arm assembly in the expanded state in Embodiment 1 of the present invention;

[0052] Figure 18 Schematic diagram of the front view structure of the moving assembly in the contracted state in Embodiment 3 of the present invention;

[0053] Figure 19 Schematic diagram of the exploded structure of the parts of the tapered sleeve, connecting seat, moving assembly and second expansion assembly in Embodiment 3 of the present invention;

[0054] Figure 20 Schematic diagram of the structure of the moving assembly in the expanded state in Embodiment 3 of the present invention.

[0055] In the figure:

[0056] 100. Expanding circle assembly; 110. Housing; 111. Rotating shaft; 112. Gear ring; 120. Taper sleeve; 121. Fitting groove; 122. Socket; 130. Connecting seat; 131. Towing rope; 132. Wiring harness; 140. End cover; 141. First electric slip ring; 142. Limiting hole; 143. First motor

[0057] 200. Swing arm assembly; 210. Crank; 220. Torsion spring; 230. Roller; 231. Temperature sensor; 232. Heat transfer oil; 233. Electric heating wire; 240. Roller; 250. Second electric slip ring

[0058] 300. Moving assembly; 310. Hub motor; 320. Support rod

[0059] 400. First expansion assembly; 410. Propulsion assembly; 411. Limiting rod; 412. Wedge block; 413. First screw sleeve; 420. First screw; 430. Second motor

[0060] 500. Second expansion assembly; 510. Third motor; 520. Second screw; 530. Second screw sleeve; 531. Linking rod

[0061] 600. Controller Detailed implementation manners

[0062] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention

[0063] Please refer to Figures 1 to 20 , the present invention provides the following four embodiments

[0064] Embodiment 1

[0065] Please refer to Figure 1 and Figure 2 , a device for expanding the inner circle of a PE pipeline, including an expanding circle assembly 100 and a controller 600. The controller 600 is installed inside the expanding circle assembly 100. The controller 600 is used to control the control and signal processing of the electrical components inside the expanding circle assembly 100, and the controller 600 adopts a conventional PLC controller. The PLC controller belongs to the conventional prior art, and those skilled in the art can select relevant models according to the actual application needs, which will not be elaborated too much in this solution

[0066] Specifically, in this embodiment, a power and communication connection is established between the controller 600 and the first motor 143 and the second motor 430 respectively, for controlling the working states of the first motor 143 and the second motor 430 through the controller 600.

[0067] Please refer to Figure 1 , Figure 2 and Figure 3 , the circle expanding assembly 100 includes a housing 110 and two end caps 140. Both ends of the housing 110 are rotatably installed on the surfaces of the end caps 140. The end caps 140 are used to limit the housing 110, so that the housing 110 rotates between the two end caps 140.

[0068] Specifically, in the actual application process, when the circle expanding assembly 100 is arranged on the inner wall of the pipeline, the inner wall of the pipeline fits with the surface of the end cap 140, that is, when the inner diameter of the pipeline is the same as the outer diameter of the end cap 140, the end cap 140 can be stably inserted into the pipeline, so as to position both ends of the circle expanding assembly 100 and keep the housing 110 capable of rotating relative to the end cap 140, so that the swing arm assembly 200 can perform a circle expanding operation on the inner wall of the pipeline.

[0069] Please refer to Figure 2 , Figure 3 and Figure 4 , internal gears 112 are arranged inside both ends of the housing 110, and one or more first motors 143 are arranged on one side of the end cap 140. The output end of the first motor 143 meshes with the inner wall of the internal gear 112.

[0070] Specifically, the first motor 143 is used to drive the internal gear 112 to rotate, thereby driving the housing 110 to rotate. Further, the rotation of the housing 110 can drive the swing arm assembly 200 to rotate along the inner wall of the pipeline, so as to perform a diameter expanding and rounding operation on the inner wall of the pipeline.

[0071] Please refer to Figure 1 , Figure 3 and Figure 5 , a plurality of swing arm assemblies 200 are arranged on the surface of the housing 110, and a first expansion assembly 400 is arranged inside the housing 110. The first expansion assembly 400 is used to drive the expansion state of the swing arm assembly 200, so as to control the expansion amount of the circle expanding operation.

[0072] Specifically, please refer to Figure 3 , Figure 5 and Figure 7 , the swing arm assembly 200 includes a crank 210, a roller 230 and a roller 240. A plurality of rotating shafts 111 are arranged on the surface of the housing 110. One end of the crank 210 is rotatably installed on the surface of the rotating shaft 111. The roller 230 is rotatably installed at the other end of the crank 210. The roller 240 is installed on the inner wall of the crank 210.

[0073] Specifically, please refer to Figure 5 , the crank 210 can rotate along the surface of the rotating shaft 111, so as to achieve the effect of expanding the swing arm assembly 200. The roller 230 at the other end of the crank 210 is in contact with the pipe wall. As the swing arm assembly 200 continues to expand and rotate, the inner diameter of the pipe is expanded or the pipe is made circular.

[0074] It should be noted that please refer to Figure 7 and Figure 8 , the swing arm assembly 200 further includes one or more torsion springs 220. The two ends of the torsion spring 220 are respectively connected to the surface of the crank 210 and the surface of the housing 110, and the torsion spring 220 is sleeved on the surface of the rotating shaft 111.

[0075] Please refer to Figure 9 , when the first expansion assembly 400 is in the deployed state, the torsion spring 220 drives the swing arm assembly 200 to rotate in the reverse direction through elastic force, so as to reset the swing arm assembly 200. For the retracted state of the swing arm assembly 200, please refer to Figure 14 .

[0076] Please refer to Figure 2 , Figure 3 , Figures 9 to 17 , the first expansion assembly 400 includes two propulsion assemblies 410, a first screw 420 and a second motor 430. The output end of the second motor 430 is connected to the first screw 420. The two propulsion assemblies 410 are symmetrically and staggeredly distributed on the surface of the first screw 420, and the thread directions at both ends of the surface of the first screw 420 are opposite.

[0077] Specifically, the second motor 430 uses a servo motor, which can accurately control the rotation position, speed and acceleration of the output shaft. This belongs to conventional and mature existing technologies and will not be elaborated in this solution. By accurately controlling the rotation angle and number of turns of the first screw 420 by the second motor 430, the position of the propulsion assembly 410 can be accurately controlled, so as to control the diameter of the rotation trajectory of the roller 240, and further control the opening diameter of the swing arm assembly 200, and perform accurate and controllable adjustment of the expansion amount of the pipe.

[0078] During the rotation of the first screw 420, through the meshing action between the first screw 420 and the inner wall of the first screw sleeve 413, the two propulsion assemblies 410 are driven to move synchronously. When the first screw 420 rotates in a certain direction, the two propulsion assemblies 410 move synchronously closer to or away from each other, so as to adjust the diameter of the rotation trajectory of the roller 240 and promote the expansion and retraction of the swing arm assembly 200.

[0079] Please refer to Figures 9 to 17, the propulsion assembly 410 includes a plurality of wedge blocks 412 and a first screw sleeve 413. The inner wall of the first screw sleeve 413 meshes with the surface of the first screw rod 420, and the plurality of wedge blocks 412 are all installed on the surface of the first screw sleeve 413.

[0080] It should be noted that the propulsion assembly 410 further includes one or more limiting rods 411, and one or more limiting holes 142 are formed on the surface of the end cover 140. The limiting rods 411 are slidably inserted into the limiting holes 142.

[0081] The combination of the limiting rod 411 and the limiting hole 142 is used to limit the propulsion assembly 410, so as to keep the propulsion assembly 410 capable of linear movement under the drive of the first screw rod 420.

[0082] Please refer to Figure 2 、 Figure 14 and Figure 17 , the roller 240 is located at the intersection of the two propulsion assemblies 410.

[0083] Specifically, when the wall thickness of the PE pipe to be rounded is relatively thin and the inner wall rounding requirement can be met by mechanical expansion.

[0084] When the two propulsion assemblies 410 move relative to each other along the first screw rod 420, a continuous circular trajectory is formed at the intersection between the slopes of the two propulsion assemblies 410. Under the elastic reaction force of the torsion spring 220, the swing arm assembly 200 urges the roller 240 to keep in contact with the intersection of the propulsion assemblies 410. And when the housing 110 drives the swing arm assembly 200 to rotate, the roller 240 rotates along the intersection of the two propulsion assemblies 410, keeping the expansion diameter of the swing arm assembly 200 in a constant state.

[0085] Specifically, when performing a rounding operation on a PE pipe with a thin wall, the staff can set the expansion diameter of the swing arm assembly 200 to be the same as the inner diameter of the PE pipe through the controller 600. During the rotation of the swing arm assembly 200, the rounding operation of the inner wall of the PE pipe can be completed, and the concave parts on the inner wall of the PE pipe can be reset, so as to keep the inner wall of the PE pipe smooth and regular.

[0086] Specifically, when performing a diameter expansion operation on a PE pipe with a thin wall, the set expansion diameter of the swing arm assembly 200 is larger than the inner diameter of the PE pipe. The second motor 430 drives the two propulsion assemblies 410 to approach each other, and the diameter of the circular trajectory at the intersection of the propulsion assemblies 410 gradually increases, causing the rotation trajectory diameter of the roller 240 to also increase accordingly, so as to gradually increase the expansion amount of the swing arm assembly 200 for rounding the pipe wall.

[0087] When the outer diameter of the swing arm assembly 200 is greater than the inner diameter of the PE pipe, the swing arm assembly 200 rotates and presses against the inner wall of the PE pipe, thereby expanding the inner wall of the PE pipe.

[0088] Conversely, when the two propulsion assemblies 410 move away from each other, the diameter of the circular trajectory at the intersection of the propulsion assemblies 410 gradually decreases, causing the diameter of the rotation trajectory of the roller 240 to also decrease accordingly, thereby gradually reducing the outer diameter of the swing arm assembly 200 and separating the swing arm assembly 200 from the inner wall of the PE pipe.

[0089] During the process of expanding the inner diameter of the PE pipe, the first motor 143 drives the housing 110 to rotate. The housing 110 drives multiple swing arm assemblies 200 to rotate, and the swing arm assemblies 200 are slowly unfolded under the action of the first expansion assembly 400. After the swing arm assemblies 200 come into contact with the inner wall of the PE pipe, the rotating rollers 230 rotate along the pipe wall. When the swing arm assemblies 200 expand, pressure is applied to the pipe wall through the rotating rollers 230. After continuous rotation, the rotating rollers 230 cause uniform expansion of the pipe wall, achieving the effect of expanding the diameter of the pipe wall.

[0090] During this process, the first screw 420 can drive the propulsion assembly 410 to move at a constant speed, and the diameter of the circle formed at the intersection of the slopes of the two propulsion assemblies 410 also increases at a constant speed, causing the diameter of the rotation trajectory of the roller 240 in the swing arm assembly 200 to also increase at a constant speed, achieving the effect of a constant increase in the expansion diameter of the swing arm assembly 200, and further achieving the effect of a constant increase in the expansion amount. Moreover, the second motor 430 can control the number of rotation turns of the first screw 420, that is, precisely control the positions of the two propulsion assemblies 410, thereby achieving the effect of precisely controlling the expansion diameter of the swing arm assembly 200, which is beneficial for precise and controllable inner wall rounding operations on the pipe.

[0091] Embodiment 2:

[0092] Based on the above disclosed technical features, another embodiment is proposed:

[0093] Please refer to Figure 8 , a temperature sensor 231 and a heating wire 233 are provided inside the rotating roller 230, and the inside of the rotating roller 230 is filled with heat-conducting oil 232.

[0094] Specifically, when the wall thickness of the PE pipe that needs to be expanded or rounded is relatively thick, the heating wire 233 can be used to assist in the rounding operation. After the heating wire 233 is energized, it generates heat, and the heat is evenly transmitted to the surface of the rotating roller 230 through the heat-conducting oil 232. The temperature sensor 231 monitors the temperature of the heat-conducting oil 232 in real time to keep the overall temperature of the rotating roller 230 in a suitable state, avoiding melting and damaging the PE pipe due to excessive temperature.

[0095] At an appropriate temperature, the rotating roller 230 rotates and contacts the inner wall of the PE pipe, conducting heat to the part of the PE pipe to be expanded in diameter, causing the temperature of this part of the PE pipe to rise, which is more conducive to the swing arm assembly 200 deforming the inner wall of the pipe, and reducing the difficulty of the operation of expanding the diameter.

[0096] Please refer to Figure 7 and Figure 8 , the swing arm assembly 200 further includes one or more second electric slip rings 250, and the second electric slip rings 250 are installed at the rotational connection between the rotating roller 230 and the crank 210.

[0097] Please refer to Figure 3 and Figure 4 , a first electric slip ring 141 is provided at the rotational connection between the end cover 140 and the housing 110.

[0098] An electrical energy and communication connection is established between the first electric slip ring 141 and the second electric slip rings 250, and an electrical energy and communication connection is respectively established between the second electric slip rings 250 and the temperature sensor 231 and the heating wire 233.

[0099] Specifically, the second electric slip rings 250 are used to supply power and transmit signals to the heating wire 233 and the temperature sensor 231 in the rotating roller 230. This is conducive to staff setting the temperature through the controller 600.

[0100] A circuit and signal connection is established between the first electric slip ring 141 and the controller 600. Therefore, the first electric slip ring 141 and the second electric slip rings 250 cooperate with each other to connect the circuit and signal connection between the controller 600 and the heating wire 233 and the temperature sensor 231. And the second electric slip rings 250 can maintain the circuit and signal connection between the controller 600 and the heating wire 233 and the temperature sensor 231 when the rotating roller 230 is in a rotating state, ensuring that the rotating roller 230 can still be real-time controlled through the controller 600 when it is in a rotating state.

[0101] Embodiment Three:

[0102] Based on the above disclosed content, another embodiment is proposed:

[0103] When the diameter expanding assembly 100 needs to expand different positions inside the PE pipe or continuously expand the straight pipe section of the PE pipe.

[0104] Please refer to Figure 1 , Figures 18 to 20 , the diameter expanding assembly 100 further includes one or more tapered sleeves 120. The tapered sleeves 120 are fixedly connected to the end cover 140, and a plurality of fitting grooves 121 are formed on the surface of the tapered sleeves 120, and a moving assembly 300 is arranged inside the fitting grooves 121.

[0105] Please refer toFigure 19 , the moving component 300 includes a hub motor 310 and a support rod 320. A rubber sleeve is fixed to the outer wall of the hub motor 310. One end of the support rod 320 is rotatably installed inside one side of the fitting groove 121, and the hub motor 310 is installed inside the other end of the support rod 320.

[0106] It should be noted that the hub motor 310 is a driving device that directly integrates the motor into the hub. It has the characteristics of a compact structure, high efficiency, and flexible driving method. It belongs to mature existing technology and will not be elaborated here.

[0107] A rubber sleeve can also be sleeved on the surface of the hub motor 310 to increase the friction between the inner wall of the PE pipe on the surface of the hub motor 310 and for buffering effects.

[0108] It should be noted that when the second expansion component 500 synchronously expands multiple moving components 300, when the hub motor 310 at one end of the moving component 300 contacts the inner wall of the pipe, due to the rubber sleeve provided on the surface of the hub motor 310, the rubber sleeve increases the radial friction between the hub motor 310 and the inner wall of the pipe, achieving the problem of preventing the rounding component 100 from rotating inside the pipe.

[0109] Please refer to Figure 19 , a second expansion component 500 is provided inside the tapered sleeve 120. The second expansion component 500 includes a third motor 510, a second screw rod 520, and a second nut 530. A circuit and signal connection is built between the third motor 510 and the controller 600 for controlling the working state of the third motor 510 through the controller 600.

[0110] Please refer to Figure 19 , the output end of the third motor 510 is connected to the second screw rod 520. The second nut 530 is rotationally engaged with the surface of the second screw rod 520. The third motor 510 is fixedly installed on the inner wall of the tapered sleeve 120.

[0111] Please refer to Figure 19 , a linkage rod 531 is rotatably connected between the second nut 530 and the support rod 320.

[0112] Specifically, when the rounding component 100 needs to move in the straight pipe section of the PE pipe, the third motor 510 operates to drive the second screw rod 520 to rotate. During this process, the second nut 530 moves along the surface of the second screw rod 520, causing the position of the end of the linkage rod 531 connected to the second nut 530 to change, thereby changing the position at the connection between the linkage rod 531 and the support rod 320, achieving the effect of the linkage rod 531 expanding the moving component 300.

[0113] Please refer to Figure 20When the moving component 300 is in the expanded state, the surface of the hub motor 310 contacts the inner wall of the PE pipe. When multiple moving components 300 contact the inner wall of the PE pipe simultaneously, since the specifications of the multiple moving components 300 are the same and the unfolding processes of the multiple moving components 300 are synchronized, after the moving components 300 contact the inner wall of the PE pipe, the axes of the second expansion component 500 and the tapered sleeve 120 can be aligned with the axis of the PE pipe, achieving the effect of self-centering.

[0114] After the hub motor 310 operates, the outer wall of the hub motor 310 contacts the inner wall of the PE pipe and drives the entire pipe expanding component 100 to move flexibly along the straight section of the PE pipe.

[0115] Specifically, after the pipe expanding component 100 moves to a specific position in the straight section of the PE pipe, the swing arm component 200 is used to expand the circle at a specific position inside the PE pipe. Secondly, after the circle expanding operation on a certain section of the PE pipe is completed, the moving component 300 drives the pipe expanding component 100 to move inside the PE pipe to achieve continuous circle expanding operation on the inside of the PE pipe.

[0116] Specifically, when performing continuous circle expanding operation on the inside of the PE pipe, the expanding diameters of the moving components 300 at both ends of the pipe expanding component 100 are different. The expanding diameter of the support rod 320 of one moving component 300 is the inner wall diameter of the pipe, and the expanding diameter of the support rod 320 of the other moving component 300 is the inner wall diameter of the pipe after circle expansion, which is used to ensure the stability and self-centering effect of the continuous circle expanding operation.

[0117] Please refer to Figures 18 to 19 The pipe expanding component 100 further includes a connecting seat 130. A towing rope 131 and a wire harness 132 are arranged inside the connecting seat 130, and the wire harness 132 is arranged inside the towing rope 131. The controller 600 is electrically connected to the wire harness 132.

[0118] A socket 122 is arranged on the surface of the tapered sleeve 120, and the socket 122 is fitted with the connecting seat 130.

[0119] Specifically, after the socket 122 is combined with the connecting seat 130, a connection channel can be established between the wire harness 132 and the controller 600. The other end of the wire harness 132 can be connected to a mobile terminal, which is convenient for the staff to connect to the controller 600 remotely and increases the flexibility of practical applications.

[0120] The towing rope 131 can tow and move the pipe expanding component 100, which is used to assist the movement of the pipe expanding component 100 in the PE pipe. The auxiliary functions include but are not limited to towing the pipe expanding component 100, manually removing the pipe expanding component 100 after a failure, and protecting the wire harness 132.

[0121] Embodiment 4:

[0122] Based on the above disclosure, another embodiment is proposed:

[0123] When the pipe expanding assembly 100 performs a pipe expanding operation on a PE pipe.

[0124] The staff places the pipe expanding assembly 100 at the pipe orifice of the PE pipe and keeps the edge of the rotating roller 230 flush with the pipe orifice.

[0125] The controller 600 is used to control the operation of the second motor 430 and the third motor 510, and synchronously expand the swing arm assembly 200 and the moving assembly 300. The expanding diameters of both the swing arm assembly 200 and the moving assembly 300 are the inner diameter of the PE pipe.

[0126] Through the expansion of the swing arm assembly 200 and the moving assembly 300, the self-centering function of the pipe expanding assembly 100 is achieved.

[0127] It should be noted that when applied to PE pipes with relatively thin pipe walls, only the mechanical pipe expanding method is adopted.

[0128] Specifically, the first motor 143 drives the housing 110 and the swing arm assembly 200 to rotate. During the rotation of the swing arm assembly 200, the first expansion assembly 400 approaches each other through two propulsion assemblies 410, increasing the rotation trajectory diameter of the rollers 240, uniformly expanding the swing arm assembly 200, and thus uniformly increasing the rotation trajectory diameter of the rotating roller 230 to perform a diameter expansion or circularity correction operation on the pipe orifice of the PE pipe.

[0129] It should be noted that when applied to PE pipes with relatively thick pipe walls, during the process of the rotating roller 230 rotating along the pipe wall, the controller 600 controls the heating wire 233 to turn on, generates heat through the heating wire 233, and the heat is evenly conducted to the surface of the rotating roller 230 by the heat-conducting oil 232.

[0130] In cooperation with the continuous rotation of the rotating roller 230 along the pipe wall, the heat can be conducted to the pipe orifice of the PE pipe, increasing the plasticity of the pipe orifice of the PE pipe, thereby reducing the difficulty of the diameter expansion or circularity correction operation at the pipe orifice of the PE pipe. In addition, during the diameter expansion or circularity correction operation of the heated PE pipe, the risk of damage is reduced, making the actual diameter expansion or circularity correction operation of the PE pipe more reliable.

[0131] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Accordingly, all changes that fall within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A PE pipe internal expansion device, characterized by: It comprises a circle expanding component (100) and a controller (600), wherein the controller (600) is installed inside the circle expanding component (100); The circle expanding assembly (100) comprises a shell (110) and two end covers (140), and two ends of the shell (110) are rotatably mounted on the surfaces of the end covers (140); Gear rings (112) are disposed inside both ends of the housing (110), and one or more first motors (143) are disposed on one side of the end cover (140), and the output end of the first motor (143) is meshed with the inner wall of the gear ring (112); A plurality of swing arm assemblies (200) are arranged on the surface of the housing (110), and a first expansion assembly (400) is arranged inside the housing (110); The swing arm assembly (200) comprises a crank (210), a rotating roller (230) and a roller (240); a plurality of rotating shafts (111) are arranged on the surface of the housing (110); one end of the crank (210) is rotatably mounted on the surface of the rotating shaft (111); the rotating roller (230) is rotatably mounted on the other end of the crank (210); and the roller (240) is mounted on the inner wall of the crank (210); The first expansion component (400) comprises two propulsion components (410), a first screw (420) and a second motor (430), wherein the output end of the second motor (430) is connected to the first screw (420), the two propulsion components (410) are symmetrically and staggeredly distributed on the surface of the first screw (420), and the thread directions of the two ends of the surface of the first screw (420) are opposite; The propulsion assembly (410) comprises a plurality of wedge blocks (412) and a first screw sleeve (413), wherein the inner wall of the first screw sleeve (413) is meshed with the surface of the first screw rod (420), and the plurality of wedge blocks (412) are all mounted on the surface of the first screw sleeve (413); The roller (240) is located at the intersection of the two propulsion assemblies (410).

2. A PE pipe internal expansion device according to claim 1, characterized in that: The swing arm assembly (200) further comprises one or more torsion springs (220), the two ends of the torsion springs (220) being respectively connected to the surface of the crank (210) and the surface of the housing (110), and the torsion springs (220) being sleeved on the surface of the rotating shaft (111).

3. A PE pipe internal expansion device according to claim 1, characterized in that: The rotating roller (230) is provided with a temperature sensor (231) and a heating wire (233) inside, and the rotating roller (230) is filled with heat-conducting oil (232).

4. A PE pipe internal expansion device according to claim 3, characterized in that: The swing arm assembly (200) further comprises one or more second electric slip rings (250), wherein the second electric slip rings (250) are installed at the rotation connection between the roller (230) and the crank (210).

5. A PE pipe internal expansion device according to claim 4, characterized in that: A first electric slip ring (141) is provided at the rotation connection between the end cover (140) and the housing (110).

6. A PE pipe internal expansion device according to claim 1, characterized in that: The propulsion assembly (410) further comprises one or more limiting rods (411), and one or more limiting holes (142) are opened on the surface of the end cover (140), and the limiting rods (411) are slidably inserted into the limiting holes (142).

7. The PE pipe internal expansion device according to claim 1, characterized in that: The circle expanding assembly (100) further comprises one or more cone sleeves (120), a plurality of engaging grooves (121) are provided on the surface of the cone sleeve (120), and a moving assembly (300) is arranged inside the engaging groove (121); The moving assembly (300) comprises a wheel hub motor (310) and a support rod (320), wherein a rubber sleeve is fixed to the outer wall of the wheel hub motor (310), one end of the support rod (320) is rotatably mounted inside one side of the engaging groove (121), and the wheel hub motor (310) is mounted inside the other end of the support rod (320).

8. A PE pipe internal expansion device according to claim 7, characterized in that: A second expansion assembly (500) is disposed inside the cone sleeve (120), and the second expansion assembly (500) comprises a third motor (510), a second screw rod (520) and a second screw sleeve (530); The output end of the third motor (510) is connected to the second screw rod (520), and the second screw sleeve (530) is rotatably engaged with the surface of the second screw rod (520); A linkage rod (531) is rotatably connected between the second screw sleeve (530) and the support rod (320).

9. A PE pipe internal expansion device according to claims 5 and 7, characterized in that: The circle expanding assembly (100) further comprises a connecting seat (130), a traction rope (131) is arranged inside the connecting seat (130), and a wiring harness (132) is arranged inside the traction rope (131); A socket (122) is provided on the surface of the cone sleeve (120), and the socket (122) is engaged with the connecting seat (130).

10. A PE pipe internal expansion device according to claim 9, characterized in that: The controller (600) is electrically connected to the wiring harness (132), and the controller (600) is electrically connected to the first electric slip ring (141), the first motor (143), the hub motor (310), the second motor (430), and the third motor (510) respectively; The first electric slip ring (141) is electrically connected to the second electric slip ring (250), and the second electric slip ring (250) is electrically connected to the temperature sensor (231) and the heating wire (233) respectively.

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