An inside-cut cable duct cutting device

Abstract

The application relates to the field of underground cable laying, in particular to an internal cutting type cable conduit cutting device which comprises a fixed long rod, a cutting assembly and an internal support assembly, the fixed long rod comprises a fixed sleeve, a first rod and a second rod, the fixed sleeve is coaxially sleeved on the first rod, the fixed sleeve is in threaded connection with the first rod, the cutting assembly is slidably sleeved on the first rod, the moving direction of the cutting assembly is parallel to the axial direction of the first rod, the cutting assembly slides when the first rod and the fixed sleeve rotate relative to each other, the first rod is coaxially sleeved on the second rod, the first rod and the second rod are in threaded connection, the internal support assembly is arranged at the end of the first rod away from the fixed sleeve, and the internal support assembly supports the inside of the conduit when the second rod and the first rod move relative to each other. The application can adapt to the cutting work of different internal diameter conduits, can guarantee the accuracy of the cutting path, and can reduce the safety hidden danger existing in the operation of the traditional cutting device.

Description

Technical Field

[0001] This invention relates to the field of underground cable laying, specifically to an internal tangential cable duct cutting device. Background Technology

[0002] In recent years, underground cables have become increasingly common in urban power grid construction. After the infrastructure portion of buried cable projects is completed, the exposed and excess MPP duct openings often have excessive lengths. Before laying the underground cables, these exposed MPP ducts need to be cut off. However, because multiple MPP cable ducts are located close together, traditional cutting tools offer limited operating space for external cutting, resulting in difficult construction and uneven, unsightly cut ends.

[0003] Using traditional cutting machines for pipe cutting presents significant safety hazards because the pipe's inner diameter is too small, the cutting arm is not flexible enough to operate inside, the workers cannot observe the inside of the pipe, the cutting path cannot be controlled, and the operation is not safe. Summary of the Invention

[0004] To address the aforementioned issues, an internal cable conduit cutting device is provided. The device uses a second rod and an internal support assembly to fix the conduit in position, a first rod and a cutting assembly to adjust the cutting position, and a fixed sleeve and a cutting assembly to perform rotary cutting inside the conduit.

[0005] To solve the problems of the prior art, the technical solution adopted by the present invention is as follows:

[0006] An internal tangential cable duct cutting device is provided, comprising a fixed long rod, a cutting assembly, and an inner support assembly. The fixed long rod includes a fixed sleeve, a first rod, and a second rod. The fixed sleeve is coaxially sleeved on the first rod and threadedly connected to the first rod. The cutting assembly is slidably sleeved on the first rod, and the direction of movement of the cutting assembly is parallel to the axial direction of the first rod. When the first rod and the fixed sleeve rotate relative to each other, the cutting assembly slides. The first rod is coaxially sleeved on the second rod, and the first rod and the second rod are threadedly connected. An inner support assembly is provided at the end of the first rod away from the fixed sleeve. When the second rod moves relative to the first rod, the inner support assembly supports the interior of the duct. The first rod extends towards one end along the axial direction of the fixed sleeve, and the second rod extends towards the other end along the axial direction of the fixed sleeve.

[0007] Preferably, the fixed long rod also includes a pipe end fixer, which is generally disc-shaped and has at least one through hole evenly distributed around the axis of the pipe end fixer. The pipe end fixer is coaxially fixed with the fixed sleeve, and the outer diameter of the fixed sleeve is smaller than the outer diameter of the pipe end fixer.

[0008] Preferably, the cutting assembly includes a movable chassis, an electric push rod, and a cutting mechanism. The movable chassis is slidably mounted on the first rod, and the moving direction of the movable chassis is parallel to the axis of the first rod. The electric push rod is mounted on the movable chassis, and the moving direction of the output end of the electric push rod is perpendicular to the axis of the first rod. The output end of the electric push rod is fixedly connected to the cutting mechanism, and the rotation axis of the output end of the cutting mechanism is parallel to the axis of the first rod.

[0009] Preferably, the fixed long rod further includes an elastic telescopic rod, one end of which is fixedly connected to the fixed sleeve, and the other end of which extends toward the cutting assembly. The axis of the elastic telescopic rod is parallel to the axis of the first rod, and the other end of the elastic telescopic rod is fixedly connected to the movable chassis. The movable chassis is threadedly connected to the first rod.

[0010] Preferably, the inner support assembly includes a movable rod, a movable component, a first hinge rod, and a second hinge rod. The movable rod is rotatably connected coaxially to the end of the first rod away from the fixed sleeve. The movable component is slidably disposed inside the movable rod, and the sliding direction of the movable component is parallel to the axial direction of the movable rod. One end of the first hinge rod is hinged to the movable component, one end of the second hinge rod is hinged to the end of the movable rod away from the first rod, and the other end of the second hinge rod is hinged to the first hinge rod. There is at least one first hinge rod, and all the first hinge rods are evenly arranged around the axis of the movable rod. The second rod can drive the movable component to move.

[0011] Preferably, the inner support assembly further includes a first spring, which is fixedly disposed between the movable member and the movable rod. The axis of the first spring is parallel to the sliding direction of the movable member, and one end of the second rod passes through the movable member and is coaxially fixedly disposed with a limit plate.

[0012] Preferably, the fixed long rod further includes a rotating sleeve and a handle. The rotating sleeve is rotatably fitted onto the outer wall of the fixed sleeve. One end of the handle is slidably connected to the rotating sleeve. The sliding direction of the handle is parallel to the axial direction of the rotating sleeve. The end of the handle connected to the rotating sleeve is provided with a positioning strip that can drive the first rod and the fixed sleeve to rotate respectively.

[0013] Preferably, a second spring is fixedly provided between the positioning strip and the grip rod. The positioning strip slides along the diameter direction of the rotating sleeve. A first positioning groove that matches the positioning strip is provided on the fixed sleeve, and a second positioning groove that matches the positioning strip is provided on the first rod.

[0014] Preferably, a first magnetic plate is fixedly provided on the handle, and a second magnetic plate that matches the first magnetic plate is fixedly provided at both ends of the rotating sleeve along its own axis.

[0015] Preferably, a handwheel is coaxially fixedly connected to the end of the second rod that is away from the first rod.

[0016] The advantages of this invention compared to the prior art are:

[0017] This invention achieves the function of fixing the position of the pipe through the second rod and the inner support assembly, the function of adjusting the cutting position through the first rod and the cutting assembly, and the function of rotary cutting inside the pipe through the fixed sleeve and the cutting assembly. Thus, it can adapt to the cutting work of pipes with different inner diameters while ensuring the accuracy of the cutting path and reducing the safety hazards that exist in the operation of traditional cutting devices. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of an internal cable duct cutting device;

[0019] Figure 2 This is a front view of an internal cable duct cutting device;

[0020] Figure 3 This is a three-dimensional sectional view of an internal cable duct cutting device;

[0021] Figure 4 yes Figure 3 A magnified view of part A in the diagram;

[0022] Figure 5 yes Figure 3 A magnified view of part B in the diagram;

[0023] Figure 6 This is a three-dimensional schematic diagram of a cutting component in an internal tangential cable duct cutting device;

[0024] Figure 7 yes Figure 3 A magnified view of part of C;

[0025] Figure 8 This is a three-dimensional schematic diagram of the internal support component in an internal tangential cable duct cutting device;

[0026] Figure 9 This is a three-dimensional schematic diagram of a fixed long rod in an internal cable duct cutting device;

[0027] Figure 10 This is a three-dimensional exploded diagram of a fixed long rod in an internal tangential cable duct cutting device.

[0028] The numbers on the map are:

[0029] 1-Fixed long rod;

[0030] 11-Fixing sleeve; 111-First positioning groove;

[0031] 12 - First rod; 121 - Second positioning slot;

[0032] 13-Second lever; 131-Limiting plate; 132-Handwheel;

[0033] 14-Pipe end retainer;

[0034] 15- Flexible telescopic rod;

[0035] 16-Rotating sleeve; 161-Second magnetic plate;

[0036] 17-Grip bar; 171-Positioning strip; 172-Second spring; 173-First magnet;

[0037] 2-Cut components;

[0038] 21-Mobile chassis;

[0039] 22-Electric linear actuator;

[0040] 23-Cutting mechanism;

[0041] 3-Internal support components;

[0042] 31-Modular lever;

[0043] 32-Active piece;

[0044] 33 - First hinge rod;

[0045] 34 - Second hinge rod;

[0046] 35 - First spring. Detailed Implementation

[0047] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0048] See Figures 1 to 4As shown, an internal tangential cable duct cutting device includes a fixed long rod 1, a cutting assembly 2, and an internal support assembly 3. The fixed long rod 1 includes a fixed sleeve 11, a first rod 12, and a second rod 13. The fixed sleeve 11 is coaxially sleeved on the first rod 12 and is threadedly connected to the first rod 12. The cutting assembly 2 is slidably sleeved on the first rod 12, and the direction of movement of the cutting assembly 2 is parallel to the axial direction of the first rod 12. When the first rod 12 and the fixed sleeve 11 rotate relative to each other, the cutting assembly 2 slides. The first rod 12 is coaxially sleeved on the second rod 13 and is threadedly connected to the second rod 13. An internal support assembly 3 is provided at the end of the first rod 12 away from the fixed sleeve 11. When the second rod 13 moves relative to the first rod 12, the internal support assembly 3 supports the interior of the duct. The first rod 12 extends towards one end along the axial direction of the fixed sleeve 11, and the second rod 13 extends towards the other end along the axial direction of the fixed sleeve 11.

[0049] The cutting points are marked on the pipe to be cut. Then, the inner support assembly 3 and the cutting assembly 2 are inserted into the pipe in sequence through the fixed long rod 1. The fixed long rod 1 is then moved so that it is coaxial with the pipe. The fixed long rod 1 is pushed further until the position of the cutting assembly 2 is at the marked position. At this time, the inner support assembly 3 is controlled to work through the first rod 12. The position of the cutting assembly 2 is fixed at this time. It is observed whether the position of the cutting assembly 2 is aligned with the marked position. If there is a deviation, the position of the cutting assembly 2 is slightly moved through the first rod 12. Then, the cutting assembly 2 is started to cut the pipe. While the cutting assembly 2 is working, the fixed sleeve 11 is rotated, so that the cutting assembly 2 can perform rotary cutting on the pipe. Compared with the prior art, the second rod 13 and the inner support assembly 3 work together to fix the position of the pipe, and the first rod 12 and the cutting assembly 2 work together to adjust the cutting position. The fixed sleeve 11 and the cutting assembly 2 work together to perform rotary cutting inside the pipe. This can adapt to the cutting of pipes with different inner diameters while ensuring the accuracy of the cutting path and reducing the safety hazards in the operation of traditional cutting devices.

[0050] See Figure 3 , Figure 4 and Figure 9 As shown: The fixed long rod 1 also includes a pipe end fixer 14. The pipe end fixer 14 is generally disc-shaped. At least one through hole is evenly distributed around the axis of the pipe end fixer 14. The pipe end fixer 14 is coaxially fixed with the fixed sleeve 11. The outer diameter of the fixed sleeve 11 is smaller than the outer diameter of the pipe end fixer 14.

[0051] Before determining the position of the cutting component 2, the inner diameter of the pipe is first determined by measurement. Then, an appropriate pipe end retainer 14 is selected. The inner support component 3 and the cutting component 2 are sequentially sent into the pipe through the fixed long rod 1. When the cutting component 2 moves to the appropriate position, the pipe end retainer 14 will contact the end of the pipe. At this time, by inserting the pipe end retainer 14 into the inside of the pipe, the fixing sleeve 11 and the pipe can be quickly aligned axially. Compared with the prior art, the pipe end retainer 14 of the present invention can fit against the inner wall of the pipe, thereby quickly and conveniently aligning the fixed long rod 1 with the pipe axially.

[0052] See Figure 3 , Figure 5 and Figure 6 As shown: The cutting assembly 2 includes a movable base 21, an electric push rod 22, and a cutting mechanism 23. The movable base 21 is slidably mounted on the first rod 12. The moving direction of the movable base 21 is parallel to the axis of the first rod 12. The electric push rod 22 is operatively mounted on the movable base 21. The moving direction of the output end of the electric push rod 22 is perpendicular to the axis of the first rod 12. The output end of the electric push rod 22 is fixedly connected to the cutting mechanism 23. The rotation axis of the output end of the cutting mechanism 23 is parallel to the axis of the first rod 12.

[0053] When the cutting component 2 is positioned at the marked location, the electric push rod 22 and the cutting mechanism 23 are activated. The electric push rod 22 pushes the cutting mechanism 23 to move along the diameter of the pipe, thereby causing the output end of the cutting mechanism 23 to contact the inner wall of the pipe and perform the cutting operation. Compared with the prior art, the electric push rod 22 of the present invention can control the movement of the cutting mechanism 23, thereby ensuring that the cutting component 2 will not conflict with the inner wall of the pipe when it is inserted into the pipe.

[0054] See Figure 3 , Figure 4 , Figure 9 and Figure 10 As shown: the fixed long rod 1 also includes an elastic telescopic rod 15. One end of the elastic telescopic rod 15 is fixedly connected to the fixed sleeve 11, and the other end of the elastic telescopic rod 15 extends toward the cutting assembly 2. The axis of the elastic telescopic rod 15 is parallel to the axis of the first rod 12. The other end of the elastic telescopic rod 15 is fixedly connected to the movable chassis 21, and the movable chassis 21 is threadedly connected to the first rod 12.

[0055] The control rod 1 drives the inner support assembly 3 and the cutting assembly 2 to enter the pipe in sequence until the pipe end fixer 14 also enters the pipe. At this time, when there is a deviation between the cutting assembly 2 and the marked position, the control rod 12 is rotated. The first rod 12 and the elastic telescopic rod 15 cooperate to make the moving chassis 21 move along the axis of the first rod 12. Compared with the prior art, the elastic telescopic rod 15 of the present invention limits the state of the moving chassis 21, thereby preventing the moving chassis 21 from rotating with the first rod 12.

[0056] See Figure 3 , Figure 7 and Figure 8 As shown: The inner support assembly 3 includes a movable rod 31, a movable member 32, a first hinge rod 33, and a second hinge rod 34. The movable rod 31 is rotatably connected coaxially to the end of the first rod 12 away from the fixed sleeve 11. The movable member 32 is slidably disposed inside the movable rod 31, and the sliding direction of the movable member 32 is parallel to the axial direction of the movable rod 31. One end of the first hinge rod 33 is hinged to the movable member 32, and one end of the second hinge rod 34 is hinged to the end of the movable rod 31 away from the first rod 12. The other end of the second hinge rod 34 is hinged to the first hinge rod 33. There is at least one first hinge rod 33. All the first hinge rods 33 are evenly arranged around the axis of the movable rod 31. The second rod 13 can drive the movable member 32 to move.

[0057] After the inner support assembly 3, the cutting assembly 2, and the pipe end fixer 14 are sequentially inserted into the pipe, and the position of the cutting assembly 2 is determined by rotating the first rod 12, the first rod 12 is controlled to move. The movement of the first rod 12 will drive the movable part 32 to move. At the same time, the movable part 32 will cooperate with the second hinge rod 34 to make one end of the first hinge rod 33 contact the inner wall of the pipe. Compared with the prior art, the first rod 12 of the present invention can control whether the inner support assembly 3 is working, thereby facilitating the user to fix the position of the pipe outside the pipe.

[0058] See Figure 3 , Figure 7 and Figure 8 As shown: The inner support assembly 3 also includes a first spring 35, which is fixedly disposed between the movable member 32 and the movable rod 31. The axis of the first spring 35 is parallel to the sliding direction of the movable member 32. One end of the second rod 13 passes through the movable member 32 and is coaxially fixedly disposed with a limit plate 131.

[0059] Before use, the first rod 12 is rotated. The first rod 12 drives the movable part 32 to move through the limiting plate 131, thereby compressing the first spring 35. When the cutting component 2 enters the pipe and the position is determined, the first rod 12 is rotated in the opposite direction. The first spring 35 is released from its compressed state and pushes the movable part 32 to move, thereby causing the first hinge rod 33 and the second hinge rod 34 to move. Compared with the prior art, the first spring 35 of the present invention allows the movable part 32 to move automatically, thereby ensuring that the end of the first hinge rod 33 can fully contact the inner wall of the pipe.

[0060] See Figure 3 , Figure 4 , Figure 9 and Figure 10 As shown: The fixed long rod 1 also includes a rotating sleeve 16 and a handle 17. The rotating sleeve 16 is rotatably sleeved on the outer wall of the fixed sleeve 11. One end of the handle 17 is slidably connected to the rotating sleeve 16. The sliding direction of the handle 17 is parallel to the axial direction of the rotating sleeve 16. The end of the handle 17 connected to the rotating sleeve 16 is provided with a positioning strip 171 that can drive the first rod 12 and the fixed sleeve 11 to rotate respectively.

[0061] After the pipe fixing device 14 enters the pipe, the second rod 13 is rotated to fix the fixed long rod 1 and the pipe. When it is necessary to rotate the fixing sleeve 11 or the first rod 12, the gripping rod 17 is grasped and rotated around the axis of the rotating sleeve 16. The first rod 12 and the fixing sleeve 11 will rotate with the rotation of the gripping rod 17. Compared with the prior art, the gripping rod 17 of the present invention provides a gripping position, thereby facilitating the use of the user.

[0062] See Figure 1 , Figure 3 , Figure 4 , Figure 9 and Figure 10 As shown: A second spring 172 is fixedly installed between the positioning strip 171 and the grip rod 17. The positioning strip 171 slides along the diameter direction of the rotating sleeve 16. A first positioning groove 111 that matches the positioning strip 171 is opened on the fixed sleeve 11, and a second positioning groove 121 that matches the positioning strip 171 is opened on the first rod 12.

[0063] When it is necessary to control the rotation of the fixed sleeve 11, push the handle 17 to slide along the axis of the rotating sleeve 16, and the positioning strip 171 will be engaged in the first positioning groove 111. At this time, rotating the handle 17 will cause the entire fixed sleeve 11 to rotate. When it is necessary to control the rotation of the first rod 12, push the handle 17 to slide along the axis of the rotating sleeve 16, and the positioning strip 171 will be engaged in the second positioning groove 121. At this time, rotating the handle 17 will cause the first rod 12 to rotate. Compared with the prior art, the positioning strip 171 of the present invention can only cooperate with one of the first positioning groove 111 and the second positioning groove 121 at the same time, so that the handle 17 can only control the rotation of one of the fixed sleeve 11 and the first rod 12 at the same time.

[0064] See Figure 3 , Figure 4 , Figure 9 and Figure 10 As shown: A first magnetic piece 173 is fixedly installed on the grip 17, and a second magnetic piece 161 that cooperates with the first magnetic piece 173 is fixedly installed at both ends of the rotating sleeve 16 along its own axis.

[0065] When the positioning strip 171 is inserted into the first positioning groove 111 and the second positioning groove 121 respectively, the first magnetic piece 173 and the second magnetic piece 161 work together to fix the position of the grip 17. Compared with the prior art, the first magnetic piece 173 and the second magnetic piece 161 of the present invention work together to fix the position of the grip 17, thereby preventing the grip 17 from moving along the axis of the rotating sleeve 16 when the grip 17 is rotated.

[0066] See Figure 3 , Figure 4 , Figure 9 and Figure 10 As shown: A handwheel 132 is coaxially fixedly connected to the end of the second rod 13 that is away from the first rod 12.

[0067] The user holds the handwheel 132 to control the rotation of the second lever 13. Compared with the prior art, the handwheel 132 of the present invention provides a gripping point, thereby facilitating the user's use.

[0068] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. An inside-cutting cable duct cutting device comprising a fixed long rod (1), a cutting assembly (2) and an inner support assembly (3), characterized in that, The fixed long rod (1) includes a fixed sleeve (11), a first rod (12), and a second rod (13); The fixed sleeve (11) is coaxially sleeved on the first rod (12). The fixed sleeve (11) is threadedly connected to the first rod (12). The cutting assembly (2) is slidably sleeved on the first rod (12). The moving direction of the cutting assembly (2) is parallel to the axial direction of the first rod (12). When the first rod (12) and the fixed sleeve (11) rotate relative to each other, the cutting assembly (2) slides. The first rod (12) is coaxially sleeved on the second rod (13). The first rod (12) and the second rod (13) are threaded together. An inner support assembly (3) is provided on the end of the first rod (12) away from the fixed sleeve (11). When the second rod (13) moves relative to the first rod (12), the inner support assembly (3) supports the inside of the pipe. The first rod (12) extends toward one end along the axis of the fixed sleeve (11), and the second rod (13) extends toward the other end along the axis of the fixed sleeve (11). The cutting assembly (2) includes a movable chassis (21), an electric push rod (22), and a cutting mechanism (23). The movable chassis (21) is slidably mounted on the first rod (12). The moving direction of the movable chassis (21) is parallel to the axis of the first rod (12). The electric push rod (22) is mounted on the movable chassis (21). The moving direction of the output end of the electric push rod (22) is perpendicular to the axis of the first rod (12). The output end of the electric push rod (22) is fixedly connected to the cutting mechanism (23). The rotation axis of the output end of the cutting mechanism (23) is parallel to the axis of the first rod (12). The fixed long pole (1) also includes an elastic telescopic pole (15); One end of the elastic telescopic rod (15) is fixedly connected to the fixed sleeve (11), and the other end of the elastic telescopic rod (15) extends toward the cutting assembly (2). The axis of the elastic telescopic rod (15) is parallel to the axis of the first rod (12). The other end of the elastic telescopic rod (15) is fixedly connected to the movable chassis (21), and the movable chassis (21) is threadedly connected to the first rod (12). The internal support assembly (3) includes a movable rod (31), a movable part (32), a first hinge rod (33), and a second hinge rod (34); The movable rod (31) is rotatably connected to the end of the first rod (12) away from the fixed sleeve (11) on the same axis. The movable part (32) is slidably disposed inside the movable rod (31). The sliding direction of the movable part (32) is parallel to the axial direction of the movable rod (31). One end of the first hinge rod (33) is hinged to the movable part (32). One end of the second hinge rod (34) is hinged to the end of the movable rod (31) away from the first rod (12). The other end of the second hinge rod (34) is hinged to the first hinge rod (33). There is at least one first hinge rod (33). All the first hinge rods (33) are evenly arranged around the axis of the movable rod (31). The second rod (13) can drive the movable part (32) to move.

2. An internally cutting cable duct cutting device according to claim 1, wherein, The fixed rod (1) also includes a pipe end fixer (14); The pipe end fixing device (14) is generally disc-shaped. At least one through hole is provided on the pipe end fixing device (14) and evenly distributed around the axis of the pipe end fixing device (14). The pipe end fixing device (14) and the fixing sleeve (11) are coaxially fixed. The outer diameter of the fixing sleeve (11) is smaller than the outer diameter of the pipe end fixing device (14).

3. An internally cutting cable duct cutting device according to claim 2, wherein, The inner support assembly (3) also includes a first spring (35); The first spring (35) is fixedly disposed between the movable part (32) and the movable rod (31). The axis of the first spring (35) is parallel to the sliding direction of the movable part (32). One end of the second rod (13) passes through the movable part (32) and is coaxially fixedly disposed with a limit plate (131).

4. An internally cutting cable duct cutting device according to claim 3, wherein, The fixed long rod (1) also includes a rotating sleeve (16) and a handle (17). The rotating sleeve (16) is rotatably fitted onto the outer wall of the fixed sleeve (11). One end of the handle (17) is slidably connected to the rotating sleeve (16). The sliding direction of the handle (17) is parallel to the axial direction of the rotating sleeve (16). The end of the handle (17) connected to the rotating sleeve (16) is provided with a positioning strip (171) that can drive the first rod (12) and the fixed sleeve (11) to rotate respectively.

5. An internally cutting cable duct cutting device according to claim 4, wherein, A second spring (172) is fixedly provided between the positioning strip (171) and the grip (17). The positioning strip (171) slides along the diameter direction of the rotating sleeve (16). A first positioning groove (111) that matches the positioning strip (171) is provided on the fixed sleeve (11), and a second positioning groove (121) that matches the positioning strip (171) is provided on the first rod (12).

6. An internally cutting cable duct cutting device according to claim 5, wherein, A first magnetic plate (173) is fixedly installed on the grip (17), and a second magnetic plate (161) that matches the first magnetic plate (173) is fixedly installed at both ends of the rotating sleeve (16) along its own axis.

7. An internally cutting cable duct cutting device according to any one of claims 1 to 6, wherein, A handwheel (132) is coaxially fixedly connected to the end of the second rod (13) away from the first rod (12).

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