A milling device for the surface oxide layer of large-diameter PE pipes

Abstract

The present invention relates to the technical field of milling devices, and provides a milling device for the surface oxide layer of large-diameter PE pipes. It can be used for the milling operation of the inner-diameter surface oxide layer and the outer-diameter surface oxide layer of large-diameter PE pipes. The overall size is small, which is convenient for operators to hold by hand. The switching adjustment between the two modes of inner-diameter operation and outer-diameter operation is relatively simple, and the operability is good. The milling cutter for forming the milling operation is convenient to replace, which is more practical. It includes a frame and an operation structure. The frame includes a left frame and a right frame, and the left frame and the right frame are connected to each other. A left hand-held frame and a right hand-held frame are respectively rotatably connected inside the left frame and the right frame. Two left drive gear rings are fixedly connected to the left hand-held frame, and two right drive gear rings are fixedly connected to the right hand-held frame. The operation structure includes an inner sliding frame and an inner sliding sleeve. The inner sliding sleeve is slidably connected to the left frame, and two left racks are connected to the inner sliding sleeve. The two left racks are respectively engaged with the two left drive gear rings.

Description

Technical Field

[0001] The present invention relates to the technical field of milling devices, and particularly relates to a milling device for the surface oxide layer of large-diameter PE pipes. Background Art

[0002] As is well known, PE pipes are widely used in building water supply, building drainage, buried drainage pipes, etc. due to their own unique advantages. At the same time, during the construction process of PE pipes, welding is usually used. Therefore, the overall structural strength and sealing effect of the pipelines constructed by PE pipes are extremely excellent. However, since PE pipes are inevitably exposed to the air during the construction process, in order to ensure the welding effect between multiple large-diameter PE pipes, a milling device for the surface oxide layer of large-diameter PE pipes is proposed.

[0003] After retrieval, a Chinese patent application with the patent number CN201310423806.7 discloses a milling device for the surface oxide layer of large-diameter PE pipes. It is generally described as including a frame, a first servo motor, a first transmission mechanism, a clamping device, a second servo motor, a second transmission mechanism, and a milling cutter provided on the frame. The first servo motor is connected to the first transmission mechanism, the first transmission mechanism is connected to the clamping device, the clamping device is provided on the side of the long axis direction of the pipe, the second servo motor is connected to the second transmission mechanism, the second transmission mechanism is connected to the milling cutter, and the milling cutter is provided on the surface of the pipe. The frame also has an electric control box, and the control circuit board in the electric control box is connected to the first servo motor and the second servo motor. When in use, after the pipe is placed on the lifting table, the pipe can be positioned and the milling depth can be adjusted. Then, under the action of the clamping device and the protective cover, the pipe rotates with the high-power servo motor, and the four rollers supporting the pipe also rotate synchronously. The low-power servo motor drives the milling cutter to mill back and forth on the surface of the pipe, and the operating speeds of the two servo motors can be appropriately adjusted according to the milling needs to make the pipe and the milling cutter cooperate well, and finally achieve the effect of removing the oxide layer on the surface of the pipe.

[0004] Although the above-mentioned prior art solution can be used as a device for milling the surface oxide layer of large-diameter PE pipes to achieve the treatment of the surface oxide layer of large-diameter PE pipes, through overall analysis by combining the text description and the attached drawings of the comparative document, it can be clearly concluded that its processing process requires placing the PE pipe into the milling device for the surface oxide layer of large-diameter PE pipes to carry out the milling operation. On the one hand, for large-diameter PE pipes, due to their large size, it is inevitable that there will be certain difficulties in handling operations. On the other hand, during the actual construction process, in order to improve construction efficiency, multi-point independent operations are usually adopted, and finally the pipelines are connected. In this way, it is more difficult to carry out the milling construction operation on the pipelines that have been installed and fixed. Summary of the Invention

[0005] (1) Technical Problems to be Solved

[0006] In view of the deficiencies of the prior art, the present invention provides a milling device for the surface oxide layer of large-diameter PE pipes, which can be used for milling operations on the inner-diameter surface oxide layer and the outer-diameter surface oxide layer of large-diameter PE pipes. The overall size is relatively small, which is convenient for operators to hold. At the same time, the switching adjustment between the two modes of inner-diameter operation and outer-diameter operation is relatively simple, and the operability is good. The milling cutter for the milling operation is convenient to replace, which is more practical.

[0007] (II) Technical Solution

[0008] To achieve the above object, the present invention provides the following technical solution: A milling device for the surface oxide layer of large-diameter PE pipes, including a frame, and further including an operation structure. The frame includes a left frame and a right frame, and the left frame and the right frame are detachably connected to each other. A left hand-held frame and a right hand-held frame are respectively rotatably connected inside the left frame and the right frame. Two left drive gear rings are fixedly connected to the left hand-held frame, and two right drive gear rings are fixedly connected to the right hand-held frame. The operation structure includes an inner sliding frame and an inner sliding sleeve. The inner sliding sleeve is slidably connected to the left frame, and two left racks are connected to the inner sliding sleeve. The two left racks are respectively meshed with the two left drive gear rings. The inner sliding frame is slidably connected to the right frame, and two right racks are connected to the inner sliding frame. The two right racks are respectively meshed with the two right drive gear rings. The inner sliding frame and the inner sliding sleeve are in sliding fit with each other. Two core frames are arranged inside the inner sliding sleeve. The two core frames are both slidably connected to the left frame. Rotating cylinders are respectively rotatably connected to the two core frames. Power structures are installed inside the two core frames respectively, and the two power structures are respectively used for driving the rotation of the two rotating cylinders. Annular cylinders are installed on the two rotating cylinders respectively, and a plurality of milling cutters are equipped on the two annular cylinders respectively. Two support cylinders are rotatably connected inside the inner sliding frame, and the two support cylinders respectively match the two rotating cylinders. Two support structures are installed on both the left frame and the right frame.

[0009] On the basis of the foregoing solution, both of the two power structures include a drive motor and an internal gear ring. The two drive motors are respectively installed inside the two core frames. Drive spur gears are installed on the output shafts of the two drive motors. The two drive spur gears are both meshed with a double-sided transmission gear ring. The two double-sided transmission gear rings are respectively rotatably connected inside the two core frames. The two double-sided transmission gear rings are respectively meshed with the two internal gear rings. The two internal gear rings are respectively fixedly connected inside the two rotating cylinders.

[0010] Preferably, on the basis of the foregoing solution, a plurality of spline grooves are opened on both of the two rotating cylinders, a plurality of cutting edges are arranged on both of the two annular cylinders, the plurality of milling cutters are respectively arranged inside the plurality of cutting edges, and the plurality of milling cutters are all fixedly connected with connecting shafts. The plurality of connecting shafts respectively match the plurality of spline grooves, and the plurality of connecting shafts are respectively located inside the two annular cylinders.

[0011] Further based on the foregoing solution, limiting rings are fixedly connected to both the rotating cylinder and the supporting cylinder, and the two limiting rings are respectively used for limiting the left end and the right end of the annular cylinder.

[0012] Still further based on the foregoing solution, insertion sections are provided at the left ends of the two supporting cylinders, insertion grooves are provided at the right ends of the two rotating cylinders, and the two insertion grooves respectively match the two insertion sections.

[0013] Even further based on the foregoing solution, the four support structures each include an inner ball sleeve and an outer ball sleeve. The four inner ball sleeves are respectively fixedly connected to the inner arc surfaces of the left frame and the right frame, and the four outer ball sleeves are respectively fixedly connected to the outer arc surfaces of the left frame and the right frame. Support balls are provided inside the four inner ball sleeves and the four outer ball sleeves.

[0014] Further as the above solution, two left ring frames are fixedly connected to the left end of the inner sliding sleeve, the two left racks are respectively fixedly connected to the two left ring frames, and both of the two left ring frames are slidably connected to the left frame. Two right ring frames are fixedly connected to the right end of the inner sliding frame, the two right racks are respectively fixedly connected to the two right ring frames, and both of the two right ring frames are slidably connected to the right frame.

[0015] Still further as the above solution, two clamping plates are fixedly connected to the left frame, two clamping grooves are formed in the right frame, two threaded holes are formed in the right frame, the two threaded holes are respectively communicated with the two clamping grooves, connection bolts are respectively threadedly connected in the two threaded holes, connection holes are formed in both of the two clamping plates, and the two connection holes respectively match the two connection bolts.

[0016] Even further as the above solution, a lead wire cavity is provided inside the left frame, lead wire holes are provided in both of the two core frames, the two lead wire holes are both communicated with the lead wire cavity, a circuit wire is provided in the lead wire cavity, and the circuit wire is used for power transmission of the power required by the two drive motors.

[0017] Further as the above solution, the circuit wire is electrically connected to an external lead wire, and an anti-bending sleeve is provided between the external lead wire and the lead wire cavity.

[0018] (III) Beneficial Effects

[0019] Compared with the prior art, the present invention provides a large-diameter PE pipe surface oxide layer milling device, which has the following beneficial effects:

[0020] 1. In the present invention, through the design of the operation structure, a functional structure for milling operation with respect to large-diameter PE pipes is formed. This functional structure can be used for milling the inner diameter surface oxide layer and the outer diameter surface oxide layer of large-diameter PE pipes. The overall size is relatively small, and the milling cutter for the milling operation can be replaced, making it more practical. Through the design of the power structure, the driving of the rotating cylinder is formed, thus facilitating the movement drive of the milling cutter relative to the large-diameter PE pipe and realizing the milling operation of the large-diameter PE pipe.

[0021] 2. In the present invention, through the cooperation of the frame, the left hand holder, and the right hand holder, the relative installation of the inner sliding frame and the inner sliding sleeve within the operation structure is formed. At the same time, it also facilitates the relative disassembly and separation of the inner sliding frame and the inner sliding sleeve, providing convenience for the replacement of the milling cutter and facilitating the operator to hold.

[0022] 3. In the present invention, through the provision of the left drive gear ring and the right drive gear ring, when rotating and adjusting the left hand holder and the right hand holder relative to the frame, the inner sliding frame and the inner sliding sleeve can be synchronously pushed forward and backward relative to the frame, making the switching adjustment between the two modes of inner diameter operation and outer diameter operation of the operation structure relatively simple. Through the provision of the support structure, it is convenient to form an auxiliary support during the milling process of the large-diameter PE pipe to facilitate the milling of the surface oxide layer of the large-diameter PE pipe, making it more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a three-dimensional structure schematic diagram of the whole of the present invention;

[0024] Figure 2 is a three-dimensional structure schematic diagram of another angle of the whole of the present invention;

[0025] Figure 3 is of the present invention Figure 2 is a partial enlarged structure schematic diagram at A in;

[0026] Figure 4 is a three-dimensional structure schematic diagram of the cooperation between the milling cutter and the connecting shaft of the present invention;

[0027] Figure 5 is a three-dimensional structure schematic diagram of the cooperation between the right frame, the inner sliding frame, the support cylinder, etc. of the present invention;

[0028] Figure 6 is a three-dimensional structure schematic diagram of the cooperation between the left frame, the inner sliding sleeve, the rotating cylinder, etc. of the present invention;

[0029] Figure 7 is a three-dimensional structure schematic diagram of the partial cross-section of the cooperation between the left frame, the inner sliding sleeve, the rotating cylinder, etc. of the present invention;

[0030] Figure 8 is of the present invention Figure 7Schematic diagram of the partially enlarged structure at position B in the [Chinese context];

[0031] Figure 9 Schematic perspective view of the partial cross-section of the cooperation among the rotating cylinder, internal gear ring and limit ring of the present invention;

[0032] Figure 10 Schematic perspective view of the annular cylinder of the present invention;

[0033] Figure 11 Schematic perspective view of the partial cross-section of the cooperation among the core frame, driving spur gear and double-sided transmission gear ring of the present invention;

[0034] Figure 12 Schematic perspective view of the meshing between the driving spur gear and the double-sided transmission gear ring of the present invention.

[0035] In the figure: 1, left frame; 2, right frame; 3, left hand-holding frame; 4, right hand-holding frame; 5, left driving gear ring; 6, right driving gear ring; 7, inner sliding frame; 8, inner sliding sleeve; 9, left rack; 10, right rack; 11, core frame; 12, rotating cylinder; 13, annular cylinder; 14, milling cutter; 15, support cylinder; 16, driving motor; 17, internal gear ring; 18, driving spur gear; 19, spline groove; 20, cutting edge; 21, connecting shaft; 22, limit ring; 23, insertion section; 24, insertion groove; 25, inner ball sleeve; 26, outer ball sleeve; 27, support ball; 28, left ring frame; 29, right ring frame; 30, clamping plate; 31, connecting bolt; 32, circuit wire; 33, external lead wire; 34, anti-bending sleeve; 35, double-sided transmission gear ring. Detailed implementation manners

[0036] Embodiment

[0037] Please refer to the appendix Figure 1 - Appendix Figure 12, a surface oxidation layer milling device for large-diameter PE pipes, comprising a frame, and further comprising an operating structure. The frame includes a left frame 1 and a right frame 2, and the left frame 1 and the right frame 2 are detachably connected to each other. Two clamping plates 30 are fixedly connected to the left frame 1, two clamping grooves are provided on the right frame 2, two threaded holes are provided on the right frame 2, the two threaded holes are respectively communicated with the two clamping grooves, connection bolts 31 are threadedly connected in the two threaded holes, connection holes are provided on the two clamping plates 30, and the two connection holes are respectively matched with the two connection bolts 31, which is convenient to form a structure for the detachable connection between the left frame 1 and the right frame 2. A left hand holder 3 and a right hand holder 4 are respectively rotatably connected inside the left frame 1 and the right frame 2. Through the cooperation of the frame, the left hand holder 3 and the right hand holder 4, the relative installation of the inner sliding frame 7 and the inner sliding sleeve 8 in the operating structure is formed, and at the same time, the relative disassembly and separation of the inner sliding frame 7 and the inner sliding sleeve 8 are also convenient, which provides convenience for the replacement of the milling cutter 14 and is convenient for the operator to hold. Two left driving gear rings 5 are fixedly connected to the left hand holder 3, and two right driving gear rings 6 are fixedly connected to the right hand holder 4. Through the provision of the left driving gear ring 5 and the right driving gear ring 6, when the left hand holder 3 and the right hand holder 4 are rotated and adjusted relative to the frame, the inner sliding frame 7 and the inner sliding sleeve 8 can be synchronously pushed forward and backward relative to the frame, so that the switching adjustment between the two modes of inner diameter operation and outer diameter operation of the operating structure is relatively simple. The operating structure includes an inner sliding frame 7 and an inner sliding sleeve 8. The inner sliding sleeve 8 is slidably connected to the left frame 1, two left rack bars 9 are connected to the inner sliding sleeve 8, and the two left rack bars 9 are respectively engaged with the two left driving gear rings 5. The inner sliding frame 7 is slidably connected to the right frame 2, two right rack bars 10 are connected to the inner sliding frame 7, and the two right rack bars 10 are respectively engaged with the two right driving gear rings 6. Two left ring frames 28 are fixedly connected to the left end of the inner sliding sleeve 8, the two left rack bars 9 are respectively fixedly connected to the two left ring frames 28, and the two left ring frames 28 are both slidably connected to the left frame 1. Two right ring frames 29 are fixedly connected to the right end of the inner sliding frame 7, the two right rack bars 10 are respectively fixedly connected to the two right ring frames 29, and the two right ring frames 29 are both slidably connected to the right frame 2.

[0038] It should be further noted that the inner sliding frame 7 and the inner sliding sleeve 8 are in sliding fit. There are two core frames 11 arranged inside the inner sliding sleeve 8. Both of the two core frames 11 are slidably connected to the left frame 1. Rotating cylinders 12 are rotatably connected to both of the two core frames 11. Power structures are installed inside both of the two core frames 11. The two power structures are respectively used for driving the rotation of the two rotating cylinders 12. The two power structures both include driving motors 16 and internal tooth rings 17. The two driving motors 16 are respectively installed inside the two core frames 11. Driving spur gears 18 are installed on the output shafts of the two driving motors 16. The two driving spur gears 18 are both meshed with double-sided transmission tooth rings 35. The two double-sided transmission tooth rings 35 are respectively rotatably connected inside the two core frames 11. The two double-sided transmission tooth rings 35 are respectively meshed with the two internal tooth rings 17. The two internal tooth rings 17 are respectively fixedly connected inside the two rotating cylinders 12. Through the design of the power structure, the driving of the rotating cylinder 12 is formed, so as to facilitate the movement driving of the milling cutter 14 relative to the large-diameter PE pipe, and realize the milling operation on the large-diameter PE pipe. Annular cylinders 13 are installed on both of the two rotating cylinders 12. A plurality of milling cutters 14 are equipped on both of the two annular cylinders 13. Two supporting cylinders 15 are rotatably connected inside the inner sliding frame 7. The two supporting cylinders 15 are respectively matched with the two rotating cylinders 12. Through the design of the operation structure, a functional structure for the milling operation on the large-diameter PE pipe is formed. This functional structure can be used for the milling operation of the inner diameter surface oxide layer and the outer diameter surface oxide layer of the large-diameter PE pipe. The overall size is small, and the milling cutter 14 for forming the milling operation can be replaced, which is more practical. A plurality of spline grooves 19 are opened on both of the two rotating cylinders 12. A plurality of cutting edges 20 are arranged on both of the two annular cylinders 13. The plurality of milling cutters 14 are respectively arranged inside the plurality of cutting edges 20. And the plurality of milling cutters 14 are all fixedly connected with connecting shafts 21. The plurality of connecting shafts 21 are respectively matched with the plurality of spline grooves 19, and the plurality of connecting shafts 21 are respectively located inside the two annular cylinders 13, showing the specific installation structure of the milling cutter 14 to correspond to the disassembly and replacement of the milling cutter 14 mentioned above. Limiting rings 22 are fixedly connected to both the rotating cylinder 12 and the supporting cylinder 15. The two limiting rings 22 are respectively used for limiting the left end and the right end of the annular cylinder 13. Insertion sections 23 are arranged at the left ends of the two supporting cylinders 15. Insertion grooves 24 are arranged at the right ends of the two rotating cylinders 12. The two insertion grooves 24 are respectively matched with the two insertion sections 23. After the two insertion sections 23 are respectively inserted into the two insertion grooves 24, the two supporting cylinders 15 can respectively form auxiliary supports for the two rotating cylinders 12, and the rotation of the two rotating cylinders 12 can respectively drive the two supporting cylinders 15 to rotate synchronously.

[0039] It should be further noted that two support structures are installed on both the left frame 1 and the right frame 2. The four support structures all include an inner ball sleeve 25 and an outer ball sleeve 26. The four inner ball sleeves 25 are respectively fixedly connected to the inner arc surfaces of the left frame 1 and the right frame 2, and the four outer ball sleeves 26 are respectively fixedly connected to the outer arc surfaces of the left frame 1 and the right frame 2. Support balls 27 are arranged inside the four inner ball sleeves 25 and the four outer ball sleeves 26. Through the provision of the support structures, it is convenient to form auxiliary supports during the milling process of large-diameter PE pipes to facilitate the milling of the surface oxide layer of the large-diameter PE pipes, which is more practical. A lead wire cavity is arranged inside the left frame 1, lead wire holes are arranged in both of the two core frames 11, and the two lead wire holes communicate with the lead wire cavity. A circuit wire 32 is arranged in the lead wire cavity. The circuit wire 32 is used for the power transmission of the power required by the two drive motors 16. The circuit wire 32 is electrically connected to an external lead wire 33, and an anti-bending sleeve 34 is arranged between the external lead wire 33 and the lead wire cavity to improve the protection of the external lead wire 33 and reduce the probability of the external lead wire 33 being abraded at the orifice of the lead wire cavity.

[0040] The drive motor 16 in this embodiment is a conventional device well-known to those skilled in the art purchased on the market. In this patent, we only use it and do not improve its structure and function. For those skilled in the art, its setting method, installation method, and electrical connection method can be debugged and operated as long as the requirements in its user manual are followed, and thus will not be elaborated here.

[0041] In summary, the working process of the large-diameter PE pipe surface oxide layer milling device is as follows. When in use, first carry the large-diameter PE pipe surface oxide layer milling device to the location where it is needed. Before use, connect it to an external power supply through the external lead wire 33. Then, the operator grasps one of the left hand holder 3 or the right hand holder 4 with one hand and lifts the frame, keeping the large-diameter PE pipe surface oxide layer milling device in a suspended state. Start the switch matching the drive motor 16 to synchronously power on the two drive motors 16. The two drive motors 16 power on and work to drive the two drive spur gears 18 to rotate respectively. The two drive spur gears 18 rotate to drive the two double-sided transmission gear rings 35 to rotate respectively. The two double-sided transmission gear rings 35 rotate to drive the two internal gear rings 17 to rotate respectively. The two internal gear rings 17 rotate to drive the two rotating cylinders 12 to rotate respectively. The two rotating cylinders 12 rotate to drive the two annular cylinders 13 to rotate respectively. The two rotating annular cylinders 13 drive the multiple milling cutters 14 installed on them to move respectively. After the milling cutters 14 run smoothly, the operator holds the left hand holder 3 with the left hand and the right hand holder 4 with the right hand, and adjusts the position of the milling cutters 14 relative to the frame by the relative synchronous rotation of the left hand holder 3 and the right hand holder 4 relative to the left frame 1 and the right frame 2 respectively. After the adjustment is completed, bring the milling cutters 14 close to the large-diameter PE pipe until the moving milling cutters 14 can contact the large-diameter PE pipe. Then, continue to rotate and adjust the left hand holder 3 and the right hand holder 4 relative to the frame according to the specific situation of the oxide layer on the surface of the large-diameter PE pipe to achieve the cutting feed of the milling cutters 14 relative to the large-diameter PE pipe.

[0042] Further, when the position to be milled on the large-diameter PE pipe is the outer surface of the large-diameter PE pipe, rotate and adjust the left hand holder 3 and the right hand holder 4 relative to the left frame 1 and the right frame 2 respectively, so that the left hand holder 3 and the right hand holder 4 rotate backward relative to the left frame 1 and the right frame 2 respectively. During this process, the left hand holder 3 realizes the backward synchronous drive of the two left ring frames 28 relative to the left frame 1 through the mutual cooperation of the two left drive gear rings 5 and the two left racks 9 respectively. The right hand holder 4 realizes the backward synchronous drive of the two right ring frames 29 relative to the right frame 2 through the mutual cooperation of the two right drive gear rings 6 and the two right racks 10 respectively. The two backward-moving left ring frames 28 and the two backward-moving right ring frames 29 push the inner carriage 7 and the inner sliding sleeve 8 backward. This state is as shown in the appendix Figure 1As shown, maintain this state, and press the support balls 27 inside the inner ball sleeve 25 against the outer surface of the large-diameter PE pipe. Then, according to the specific situation, continue to relatively rotate the relative rotation angle between the left hand holder 3 and the right hand holder 4 to control the backward displacement amount of the two rotating cylinders 12, so as to control the milling depth of the outer surface of the large-diameter PE pipe. During the milling process, adjust the position of the large-diameter PE pipe surface oxide layer milling device relative to the outer surface of the large-diameter PE pipe according to the milling state, so as to realize the milling operation of the outer surface of the large-diameter PE pipe that needs to be milled. When milling the inner surface of the large-diameter PE pipe is required, rotate the left hand holder 3 and the right hand holder 4 relative to the left frame 1 and the right frame 2 respectively, so that both the left hand holder 3 and the right hand holder 4 rotate backward correspondingly, realizing the synchronous forward movement of the multiple milling cutters 14 on the two rotating cylinders 12 relative to the frame. Then, make the support balls 27 inside the outer ball sleeve 26 contact the inner surface of the large-diameter PE pipe to complete the milling operation of the inner surface of the large-diameter PE pipe.

Claims

1. A large-diameter PE pipe surface oxide layer milling device, including a frame, characterized in that, It further includes a working structure. The frame includes a left frame (1) and a right frame (2), and the left frame (1) and the right frame (2) are detachably connected to each other. A left hand holder (3) and a right hand holder (4) are respectively rotatably connected inside the left frame (1) and the right frame (2). Two left driving toothed rings (5) are fixedly connected to the left hand holder (3), and two right driving toothed rings (6) are fixedly connected to the right hand holder (4). The working structure includes an inner sliding frame (7) and an inner sliding sleeve (8). The inner sliding sleeve (8) is slidably connected to the left frame (1), and two left rack bars (9) are connected to the inner sliding sleeve (8). The two left rack bars (9) are respectively meshed with the two left driving toothed rings (5). The inner sliding frame (7) is slidably connected to the right frame (2), and two right rack bars (10) are connected to the inner sliding frame (7). The two right rack bars (10) are respectively meshed with the two right driving toothed rings (6). The inner sliding frame (7) and the inner sliding sleeve (8) are in sliding fit with each other. Two core frames (11) are arranged inside the inner sliding sleeve (8). The two core frames (11) are both slidably connected to the left frame (1). Rotating cylinders (12) are respectively rotatably connected to the two core frames (11). Power structures are installed inside the two core frames (11), and the two power structures are respectively used for driving the rotation of the two rotating cylinders (12). Annular cylinders (13) are installed on the two rotating cylinders (12), and a plurality of milling cutters (14) are respectively matched with the two annular cylinders (13). Two support cylinders (15) are rotatably connected inside the inner sliding frame (7), and the two support cylinders (15) are respectively matched with the two rotating cylinders (12). Two support structures are installed on the left frame (1) and the right frame (2) respectively. The four support structures all include inner spherical sleeves (25) and outer spherical sleeves (26). The four inner spherical sleeves (25) are respectively fixedly connected to the inner arc surfaces of the left frame (1) and the right frame (2), and the four outer spherical sleeves (26) are respectively fixedly connected to the outer arc surfaces of the left frame (1) and the right frame (2). Support balls (27) are arranged inside the four inner spherical sleeves (25) and the four outer spherical sleeves (26).

2. The surface oxide layer milling device for large-diameter PE pipes according to claim 1, characterized in that, The two power structures both include a driving motor (16) and an inner toothed ring (17). The two driving motors (16) are respectively installed inside the two core frames (11). Driving spur gears (18) are installed on the output shafts of the two driving motors (16). The two driving spur gears (18) are both meshed with double-sided driving toothed rings (35). The two double-sided driving toothed rings (35) are respectively rotatably connected inside the two core frames (11). The two double-sided driving toothed rings (35) are respectively meshed with the two inner toothed rings (17). The two inner toothed rings (17) are respectively fixedly connected inside the two rotating cylinders (12).

3. The surface oxide layer milling device for large-diameter PE pipes according to claim 2, characterized in that, A plurality of spline grooves (19) are formed in each of the two rotating cylinders (12). A plurality of cutting edges (20) are provided on each of the two annular cylinders (13). A plurality of milling cutters (14) are respectively arranged in the plurality of cutting edges (20), and a connecting shaft (21) is fixedly connected to each of the plurality of milling cutters (14). The plurality of connecting shafts (21) respectively match the plurality of spline grooves (19), and the plurality of connecting shafts (21) are respectively located inside the two annular cylinders (13).

4. A surface oxide layer milling device for large-diameter PE pipes according to claim 3, characterized in that Limit rings (22) are fixedly connected to both the rotating cylinder (12) and the support cylinder (15). The two limit rings (22) are respectively used for limiting the left end and the right end of the annular cylinder (13).

5. The surface oxide layer milling device for large-diameter PE pipes according to claim 4, characterized in that Insertion segments (23) are provided at the left ends of the two support cylinders (15). Insertion grooves (24) are provided at the right ends of the two rotating cylinders (12). The two insertion grooves (24) respectively match the two insertion segments (23).

6. The surface oxide layer milling device for large-diameter PE pipes according to claim 5, characterized in that, Two left ring frames (28) are fixedly connected to the left end of the inner sliding sleeve (8). The two left racks (9) are respectively fixedly connected to the two left ring frames (28). The two left ring frames (28) are both slidably connected to the left frame (1). Two right ring frames (29) are fixedly connected to the right end of the inner sliding frame (7). The two right racks (10) are respectively fixedly connected to the two right ring frames (29). The two right ring frames (29) are both slidably connected to the right frame (2).

7. A milling device for the surface oxide layer of a large-diameter PE pipe according to claim 6, characterized in that, Two clamping plates (30) are fixedly connected to the left frame (1). Two clamping grooves are formed in the right frame (2). Two threaded holes are formed in the right frame (2), and the two threaded holes are respectively communicated with the two clamping grooves. Connecting bolts (31) are respectively threadedly connected in the two threaded holes. Connecting holes are formed in the two clamping plates (30), and the two connecting holes respectively match the two connecting bolts (31).

8. A large-diameter PE pipe surface oxide layer milling device according to claim 7, characterized in that, A lead wire cavity is arranged inside the left frame (1). Lead wire holes are arranged in both of the two core frames (11). The two lead wire holes are both communicated with the lead wire cavity. A circuit wire (32) is arranged in the lead wire cavity, and the circuit wire (32) is used for power transmission of the power required by the two drive motors (16).

9. A surface oxide layer milling device for large-diameter PE pipes according to claim 8, characterized in that, The circuit wire (32) is electrically connected to an external lead wire (33). An anti-bending sleeve (34) is arranged between the external lead wire (33) and the lead wire cavity.

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