CPVC cable protection pipe with compression-resistant buffer structure

Abstract

The application relates to the technical field of cable protection pipes, and discloses a CPVC cable protection pipe with a compression-resistant buffer structure, which comprises a protection pipe I and a protection pipe II. One side of the surface of the protection pipe I is fixed with a flexible connecting piece, one end of the protection pipe II is fixed with a hard connecting piece, one end of the hard connecting piece is fixed with a transition pipe, the transition pipe is connected with the flexible connecting piece, and the application further comprises a pressing limiting mechanism arranged on the surface of the transition pipe. The application has the advantages that the construction convenience and the post-burial stability are considered. In the unburied state, the protection pipe I and the protection pipe II can realize angle free adjustment through the cooperation of the flexible connecting piece and the transition pipe, so that the pipes are convenient to carry, place and on-site lay and position. After being buried, the soil pressure automatically triggers the pressing limiting mechanism, the rotating limiting structure and the lifting limiting assembly to realize mechanical locking of the angle, effectively prevent the pipe body from deviating due to external load, and continuously protect the cable.

Description

Technical Field

[0001] This invention relates to the field of cable protection pipe technology, specifically a CPVC cable protection pipe with a pressure-resistant buffer structure. Background Technology

[0002] Chlorinated polyvinyl chloride (CPVC) cable protection pipes are widely used in underground power cable laying projects due to their excellent corrosion resistance, insulation, and mechanical strength. Most existing CPVC cable protection pipes are rigid pipes, and the pipe bodies are usually connected by socket or threaded connections. The angle of the connection is fixed and cannot be flexibly adjusted according to the site terrain. This results in long-distance rigid pipes occupying a lot of space and being inconvenient to handle during transportation, placement, and laying. At the same time, the angle of the pipe body cannot be changed after connection, making it difficult to adapt to curved cable trenches or laying paths that require turns.

[0003] To address the aforementioned issues, some existing technologies employ flexible joints at the pipe connections, allowing for rotation between the two pipe sections at a certain angle, facilitating construction adjustments. However, once buried underground, these flexible connection structures lack a reliable rigid locking mechanism, making them prone to angular displacement under soil pressure and external loads. This can lead to cable compression or bending, affecting the protective effect. Therefore, there is an urgent need for a cable protection pipe that can maintain flexibility before and during construction for easy handling and laying, while also automatically or manually locking the angle after burial to provide stable pressure-resistant protection. Summary of the Invention

[0004] This invention aims to solve the technical problem that existing CPVC cable protection pipes cannot simultaneously achieve both construction convenience and angular stability after burial, and provides a CPVC cable protection pipe with a pressure-resistant buffer structure.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a CPVC cable protection pipe with a pressure-resistant buffer structure, comprising a first protection pipe and a second protection pipe, wherein a flexible connector is fixed to one side of the surface of the first protection pipe, a rigid connector is fixed to one end of the second protection pipe, a transition pipe is fixed to one end of the rigid connector, the transition pipe and the flexible connector are connected, and the invention further comprises: A pressing and limiting mechanism is disposed on the surface of the transition tube, and the pressing and limiting mechanism includes a hinged engagement member for pushing. A rotation limiting structure is provided in the inner cavity of the first protective tube; A lifting limit assembly is disposed on the surface of a rotation limit structure; A stabilizing component, wherein the stabilizing component is disposed within the inner cavity of the rotation limiting structure; An intermediate stabilizing component is disposed within the inner cavity of the transition tube; A reinforcing component is disposed on the surface of the pressing and limiting mechanism.

[0006] Preferably, the pressing and limiting mechanism includes two pressing plates symmetrically arranged on both sides of the transition tube surface. Several first hinge members are fixed on the surface of the pressing plates. A force-bearing rod penetrating the surface of the transition tube is hinged to the surface of the first hinge member. A first spring is fixed on the surface of the force-bearing rod. The other end of the first spring is fixed to the inner cavity of the transition tube. A downward displacement structure is provided at the other end of the force-bearing rod.

[0007] Preferably, the downward displacement structure includes a downward pressure plate fixed to the other end of the force-bearing rod, a second hinge member fixed to the bottom of the downward pressure plate, a push rod hinged to the surface of the second hinge member, and a hinge engagement member hinged to one end of the push rod.

[0008] Preferably, the rotation limiting structure includes several fixed posts fixed to an inner cavity of the protective tube, an upper plate fixed to the surface of the fixed posts, a rotating plate rotatably disposed on the surface of the upper plate, several limiting posts fixed to the surface of the rotating plate, a lower plate slidably disposed on the surface of the limiting posts, several friction elements fixed to the surface of the lower plate, the friction elements also disposed on the surface of the upper plate, and a docking assembly disposed at the other end of the rotating plate.

[0009] Preferably, the docking assembly includes a rotating engaging component fixed to the surface of the rotating plate, an insertion tube fixed in the inner cavity of the rotating engaging component, a flared end of the insertion tube, an insertion rod slidably disposed in the inner cavity of the insertion tube, and the insertion rod and the hinge engaging component being fixedly connected.

[0010] Preferably, the lifting and limiting assembly includes a force-bearing block that slides within the inner cavity of the insertion tube and a groove formed on the surface of the rotating plate. A connecting block is fixed to the surface of the force-bearing block, and a limiting rod is slidably arranged within the inner cavity of the connecting block. Both ends of the limiting rod are fixed to the surface of the groove in the insertion tube wall. A second spring is fixed to the surface of the limiting rod, and the other end of the second spring is fixed to the surface of the groove in the insertion tube wall. The connecting block is inclined.

[0011] Preferably, the stabilizing component includes a piston head that slides within the inner cavity of the insertion rod, one end of the piston head is fixed with a slide rod, the other end of the slide rod is fixed with a support column, and the inner cavity of the slide rod is provided with an air supply component.

[0012] Preferably, the air delivery assembly includes a connecting hole formed in the inner cavity of the slide rod, the connecting hole passing through the slide rod and connecting to the outside, the other end of the connecting hole being connected to a connecting air tube, and the other end of the connecting air tube being connected to an air bag.

[0013] Preferably, the intermediate stabilizing component includes several stabilizing columns fixed to the inner cavity of the transition tube, and a central stabilizing tube fixed to the other end of the several stabilizing columns. The central stabilizing tube and the transition tube are coaxially arranged. The airbag is fixed to the inner side of the central stabilizing tube, and the support column is fixed to the surface of the central stabilizing tube.

[0014] Preferably, the reinforcing component includes a fixing plate fixed to the end faces of the two pressing plates, and the surface of the fixing plate is provided with a plurality of bolt holes, the surface of which is engaged with internal angle bolts.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: Balancing construction convenience with post-burial stability: In the unburied state, the angles of Protective Pipe 1 and Protective Pipe 2 can be freely adjusted through the cooperation of flexible connectors and transition pipes, facilitating handling, placement, and on-site installation and positioning; after burial, soil pressure automatically triggers the pressing limit mechanism, rotation limit structure, and lifting limit component to work together to achieve mechanical locking of the angle, effectively preventing pipe displacement caused by external loads and ensuring continuous protection of the cable.

[0016] Automatic and manual dual-mode operation: This invention can automatically trigger angle locking through soil pressure (the first spring also acts as a buffer), or manually lock the pressing plate through the inner angle bolts in the reinforcing component, making it suitable for different construction scenarios and improving the flexibility and reliability of use.

[0017] Cable clamping and buffering protection: During the movement of the insertion rod, the compressed air between the piston head and the slide rod drives the airbag to expand. The airbag expands radially to clamp the cable, which not only provides radial fixation, but also buffers against external impacts, preventing the cable from shaking inside the tube or being subjected to excessive extrusion. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure in this invention; Figure 2 This is a three-dimensional structural diagram from another perspective in this invention; Figure 3 This is a partial three-dimensional structural diagram of the protective tube 1 and the protective tube 2 after being cut open in this invention; Figure 4 This is a partial three-dimensional structural diagram of the pressing and limiting mechanism and the downward displacement structure in this invention; Figure 5 This is a partial three-dimensional structural diagram of the downward displacement structure and docking assembly in this invention; Figure 6 This is a partial three-dimensional structural diagram of the rotation limiting structure and docking assembly in this invention; Figure 7 This is a partial three-dimensional structural diagram of the rotation limiting structure and the lifting limiting component in this invention; Figure 8 This is a partial three-dimensional structural diagram of the docking component and the stabilizing component in this invention; Figure 9 This is a partial three-dimensional structural diagram of the stabilizing component and the air supply component in this invention; Figure 10 This is a partial three-dimensional structural diagram of the stabilizing component and the intermediate stabilizing component in this invention; Figure 11 This is a partial three-dimensional structural diagram of the intermediate stabilizing component and the stabilizing component in this invention.

[0019] In the diagram: 100, Protective tube one; 200, Flexible connector; 300, Transition tube; 400, Rigid connector; 500, Protective tube two; 600, Pressing and limiting mechanism; 610, Pressing plate; 620, First hinge; 630, Force rod; 640, First spring; 650, Downward displacement structure; 651, Downward pressing plate; 652, Second hinge; 653, Push rod; 654, Hinge engaging component; 700, Rotation limiting structure; 710, Fixed column; 720, Upper plate; 730, Limiting column; 740, Lower plate; 750, Rotating plate; 760, Connecting assembly; 761, Rotation engaging component; 762 763. Insertion tube; 764. Flaring device; 775. Insertion rod; 806. Friction component; 810. Lifting and limiting assembly; 820. Force-bearing block; 830. Connecting block; 840. Limiting rod; 850. Second spring; 901. Slide groove; 912. Stabilizing assembly; 923. Piston head; 934. Slide rod; 945. Support column; 946. Air supply assembly; 947. Connecting hole; 948. Connecting air pipe; 949. Airbag; 1000. Intermediate stabilizing assembly; 1010. Intermediate stabilizing tube; 1020. Stabilizing column; 1100. Reinforcing assembly; 1110. Fixing plate; 1120. Bolt hole; 1130. Internal angle bolt. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1-11As shown, a CPVC cable protection pipe with a pressure-resistant buffer structure includes a first protection pipe 100 and a second protection pipe 500. A flexible connector 200 is fixed to one side of the surface of the first protection pipe 100, a rigid connector 400 is fixed to one end of the second protection pipe 500, and a transition pipe 300 is fixed to one end of the rigid connector 400. The transition pipe 300 and the flexible connector 200 are connected. The pipe also includes: A pressing and limiting mechanism 600 is disposed on the surface of the transition tube 300. The pressing and limiting mechanism 600 includes a hinged engagement member 654 for pushing. Rotation limiting structure 700 is provided in the inner cavity of protective tube 100; Lifting limit component 800 is disposed on the surface of rotation limit structure 700; Stabilizing component 900, which is disposed in the inner cavity of rotation limiting structure 700; Intermediate stabilizing component 1000 is disposed in the inner cavity of transition tube 300; Reinforcing component 1100 is disposed on the surface of pressing and limiting mechanism 600.

[0022] Please see Figure 4 As shown, the pressing and limiting mechanism 600 includes two pressing plates 610 symmetrically arranged on both sides of the surface of the transition tube 300. Several first hinge members 620 are fixed on the surface of the pressing plate 610. A force-bearing rod 630 penetrating the surface of the transition tube 300 is hinged to the surface of the first hinge member 620. A first spring 640 is fixed on the surface of the force-bearing rod 630. The other end of the first spring 640 is fixed to the inner cavity of the transition tube 300. A downward displacement structure 650 is provided at the other end of the force-bearing rod 630. In this embodiment, the pressing plate 610 can sense external forces. When the first protective tube 100 and the second protective tube 500 are buried in the soil, the pressing force of the soil will cause the pressing plates 610 on both sides to contract inward. Then, with the cooperation of the first hinge member 620, the force-bearing rod 630 will drive the downward displacement structure 650 to move. Under the action of the first spring 640, the pressing force of the soil will be buffered.

[0023] The downward displacement structure 650 includes a downward pressure plate 651 fixed to the other end of the force-bearing rod 630. A second hinge member 652 is fixed to the bottom of the downward pressure plate 651. A push rod 653 is hinged to the surface of the second hinge member 652. A hinge engagement member 654 is hinged to one end of the push rod 653. In this embodiment, when the force-bearing rod 630 moves, the downward pressure plate 651 can move. The second hinge member 652 hinged to the surface of the downward pressure plate 651 can cause the push rod 653 to drive the hinge engagement member 654 to move.

[0024] Please see Figure 5 and Figure 6 As shown, the rotation limiting structure 700 includes several fixed posts 710 fixed to the inner cavity of the protective tube 100. An upper plate 720 is fixed to the surface of the fixed posts 710. A rotating plate 750 is rotatably disposed on the surface of the upper plate 720. Several limiting posts 730 are fixed to the surface of the rotating plate 750. A lower plate 740 is slidably disposed on the surface of the limiting posts 730. Several friction elements 770 are fixed to the surface of the lower plate 740. The friction elements 770 are also disposed on the surface of the upper plate 720. A docking assembly 760 is disposed at the other end of the rotating plate 750. In this embodiment, the fixed posts 710 provide support for the rotation of the rotating plate 750, thereby providing support for the angle of the docking assembly 760. At the same time, when the lower plate 740 rises by lifting the limiting assembly 800, the friction elements 770 can be used to limit the rotation angle between the upper plate 720 and the rotating plate 750.

[0025] The docking assembly 760 includes a rotating engaging member 761 fixed to the surface of the rotating plate 750. An insertion tube 762 is fixed inside the rotating engaging member 761. A flaring tool 763 is provided at one end of the insertion tube 762. An insertion rod 764 is slidably disposed inside the insertion tube 762. The insertion rod 764 is fixedly connected to the hinge engaging member 654. In this embodiment, under the action of the rotating plate 750, angular support can be provided for the rotation of the rotating engaging member 761. If the angles of the insertion rod 764 and the insertion tube 762 are inconsistent, the flaring tool 763 can assist the insertion rod 764 in entering the insertion tube 762, thereby achieving the purpose of limiting the angles of the protective tube 100, the flexible connector 200, and the transition tube 300.

[0026] Please see Figure 6 As shown, the lifting and limiting assembly 800 includes a force-receiving block 810 that slides within the inner cavity of the insertion tube 762 and a groove 850 formed on the surface of the rotating plate 750. A connecting block 820 is fixed to the surface of the force-receiving block 810, and a limiting rod 830 is slidably disposed within the inner cavity of the connecting block 820. Both ends of the limiting rod 830 are fixed to the surface of the groove in the wall of the insertion tube 762. A second spring 840 is fixed to the surface of the limiting rod 830, and the other end of the second spring 840 is fixed to the surface of the groove in the wall of the insertion tube 762. The connecting block 820 is inclined. In this embodiment, with this arrangement, when the insertion rod 764 enters the insertion tube 762, it can push the force block 810, and at the same time, the connecting block 820 is inserted between the lower plate 740 and the rotating plate 750, causing the lower plate 740 to rise, thereby causing the friction element 770 on the surface of the upper plate 720 to come into contact with the friction element 770 on the surface of the lower plate 740. Through the friction between the friction elements 770 on both sides, the angle of the rotating plate 750 is limited, further limiting the angle between the protective tube 100 and the transition tube 300.

[0027] The friction component 770 is made of a material with a high coefficient of friction. When the lower plate 740 is lifted by the lifting and limiting component 800, the friction components on the surfaces of the upper and lower plates press against each other, and the rotating plate 750 is prevented from rotating further by static friction.

[0028] Please see Figure 8 As shown, the stabilizing component 900 includes a piston head 910 that slides within the inner cavity of the insertion rod 764. One end of the piston head 910 is fixed with a slide rod 920, and the other end of the slide rod 920 is fixed with a support column 930. An air supply component 940 is provided within the inner cavity of the slide rod 920. In this embodiment, when the insertion rod 764 moves, the piston head 910 slides in a sealed manner with the inner wall of the insertion rod 764, which guides and stabilizes the movement of the insertion rod 764. At the same time, with the sealed arrangement between the slide rod 920 and the insertion rod 764, air between the insertion rod 764 and the slide rod 920 enters the air supply component 940.

[0029] Please see Figure 9 As shown, the air delivery assembly 940 includes a connecting hole 941 formed in the inner cavity of the slide rod 920. The connecting hole 941 passes through the slide rod 920 and connects to the outside. The other end of the connecting hole 941 is connected to a connecting air tube 942, and the other end of the connecting air tube 942 is connected to an airbag 943. In this embodiment, when the air between the insertion rod 764 and the slide rod 920 changes, air can enter the connecting air tube 942 through the connecting hole 941. Then, under the action of several insertion rods 764, the airbag 943 expands to achieve the purpose of restricting and clamping the cable.

[0030] Please see Figure 11 As shown, the intermediate stabilizing component 1000 includes several stabilizing columns 1020 fixed to the inner cavity of the transition tube 300. The other end of the several stabilizing columns 1020 is fixed to the intermediate stabilizing tube 1010. The intermediate stabilizing tube 1010 and the transition tube 300 are coaxially arranged. The airbag 943 is fixed to the inner side of the intermediate stabilizing tube 1010, and the support column 930 is fixed to the surface of the intermediate stabilizing tube 1010. In this embodiment, the arrangement of the intermediate stabilizing tube 1010 and the stabilizing columns 1020 provides a limit for the operation of the airbag 943 and the support column 930, thereby improving the stability of the stabilizing component 900 during operation.

[0031] Please see Figure 3As shown, the reinforcing component 1100 includes a fixing plate 1110 fixed to the end faces of the two pressing plates 610. The surface of the fixing plate 1110 is provided with a plurality of bolt holes 1120, and the surface of the bolt holes 1120 is engaged with an internal angle bolt 1130. In this embodiment, during the stabilization stage, in addition to the soil causing the two pressing plates 610 to move relative to each other, the workers can also use the fixing plate 1110, the bolt holes 1120 and the internal angle bolt 1130 to cause the two pressing plates 610 to move relative to each other, thereby achieving the purpose of activating the pressing limit mechanism 600, and providing another solution for the stability between the first protective tube 100 and the second protective tube 500.

[0032] Working principle: When the CPVC cable protection pipe with pressure-resistant buffer structure is not initially buried, the first protection pipe 100 and the second protection pipe 500 can move freely at a certain angle through the cooperation of the flexible connector 200 and the transition pipe 300, which facilitates handling, placement and on-site installation.

[0033] After the protective pipe 100 and the protective pipe 2 500 are buried underground, the soil pressure acts on the pressing plates 610 symmetrically arranged on both sides of the surface of the transition pipe 300. The pressing plates 610 on both sides move towards each other under the soil pressure, and through the first hinge 620, the force rod 630 is driven to pass through the surface of the transition pipe 300 and move towards the inner cavity. At the same time, the first spring 640 sleeved on the surface of the force rod 630 is compressed, and the first spring 640 plays a buffering role against the soil impact force.

[0034] When the force-bearing rod 630 moves inward, it drives the lower pressure plate 651, which is fixed at its other end, to move synchronously. The lower pressure plate 651 is hinged to the push rod 653 through the second hinge 652 at the bottom. The push rod 653 pushes the hinge engaging member 654 to move in a preset direction. The hinge engaging member 654 is fixedly connected to the insertion rod 764, so the insertion rod 764 is pushed to move towards the insertion tube 762.

[0035] Guided by the flaring device 763, the front end of the insertion rod 764 smoothly enters the inner cavity of the insertion tube 762 even with a certain angular deviation. The insertion rod 764 continues to advance, pushing the force-bearing block 810, which is slidably disposed within the inner cavity of the insertion tube 762. The force-bearing block 810 drives the connecting block 820, which is fixed to it, to slide along the limiting rod 830, compressing the second spring 840. Because the connecting block 820 is inclined, it gradually inserts between the lower plate 740 and the rotating plate 750 during its movement, lifting the lower plate 740 upwards.

[0036] After the lower plate 740 rises, the friction element 770 fixed on its surface comes into contact with and abuts against the friction element 770 on the surface of the upper plate 720. The friction element 770 is made of a high coefficient of friction material, which generates a large static friction force after contact, thereby preventing the rotating plate 750 from rotating further relative to the upper plate 720. The rotating plate 750 is supported by the fixed column 710. After its rotation angle is locked, the angle of the docking assembly 760 and the transition tube 300 fixed to it is also fixed, ultimately achieving a stable locking of the angle between the first protective tube 100 and the second protective tube 500.

[0037] Meanwhile, during the movement of the insertion rod 764, the piston head 910 slides in a sealed manner against the inner wall of the insertion rod 764, guiding and stabilizing the insertion rod 764. The air in the sealed chamber formed between the insertion rod 764 and the slide rod 920 is compressed and enters the connecting air pipe 942 through the connecting hole 941 in the inner cavity of the slide rod 920, and is then delivered to the airbag 943 fixed inside the central stabilizing tube 1010. After inflating, the airbag 943 expands radially, clamping the cable passing through the inside of the protective tube, providing radial buffering and fixation.

[0038] As an additional starting method, staff can also manually lock the reinforcing component 1100: screw the inner angle bolt 1130 on the surface of the fixing plate 1110 into the bolt hole 1120 and tighten it, so that the two pressing plates 610 on both sides move relative to each other, thereby triggering the above set of actions, so as to achieve the effect of pre-locking the angle and clamping the cable without soil pressure.

[0039] When unlocking or adjusting the angle is required for maintenance, the inner angle bolt 1130 can be loosened or the external pressure can be removed. The restoring force of the first spring 640 and the second spring 840 resets each component, the insertion rod 764 exits the insertion tube 762, the friction element 770 separates, the rotating plate 750 returns to a rotatable state, and the flexible connector 200 allows the angle to be adjusted again.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A CPVC cable protection pipe with a pressure-resistant buffer structure, comprising a first protection pipe (100) and a second protection pipe (500), characterized in that: A flexible connector (200) is fixed to one side of the surface of the first protective tube (100), a rigid connector (400) is fixed to one end of the second protective tube (500), a transition tube (300) is fixed to one end of the rigid connector (400), the transition tube (300) and the flexible connector (200) are connected, and the device further includes: A pressing and limiting mechanism (600) is disposed on the surface of the transition tube (300), and the pressing and limiting mechanism (600) includes a hinged engagement member (654) for pushing. A rotation limiting structure (700) is provided in the inner cavity of the first protective tube (100); A lifting limit assembly (800) is disposed on the surface of a rotation limit structure (700); A stabilizing component (900) is disposed within the cavity of the rotation limiting structure (700); An intermediate stabilizing component (1000) is disposed in the inner cavity of the transition tube (300); A reinforcing component (1100) is disposed on the surface of the pressing and limiting mechanism (600).

2. The CPVC cable protection pipe with a pressure-resistant buffer structure according to claim 1, characterized in that: The pressing and limiting mechanism (600) includes two pressing plates (610) symmetrically arranged on both sides of the surface of the transition tube (300). Several first hinge members (620) are fixed on the surface of the pressing plate (610). A force rod (630) penetrating the surface of the transition tube (300) is hinged to the surface of the first hinge member (620). A first spring (640) is fixed on the surface of the force rod (630). The other end of the first spring (640) is fixed to the inner cavity of the transition tube (300). A downward displacement structure (650) is provided at the other end of the force rod (630).

3. The CPVC cable protection pipe with a pressure-resistant buffer structure according to claim 2, characterized in that: The pressure shifting structure (650) includes a pressure plate (651) fixed to the other end of the force-bearing rod (630), a second hinge (652) fixed to the bottom of the pressure plate (651), a push rod (653) hinged to the surface of the second hinge (652), and a hinge engagement member (654) hinged to one end of the push rod (653).

4. The CPVC cable protection pipe with a pressure-resistant buffer structure according to claim 1, characterized in that: The rotation limiting structure (700) includes several fixed posts (710) fixed to the inner cavity of the protective tube (100). An upper plate (720) is fixed to the surface of the fixed posts (710). A rotating plate (750) is rotatably arranged on the surface of the upper plate (720). Several limiting posts (730) are fixed to the surface of the rotating plate (750). A lower plate (740) is slidably arranged on the surface of the limiting posts (730). Several friction elements (770) are fixed to the surface of the lower plate (740). The friction elements (770) are also arranged on the surface of the upper plate (720). A docking assembly (760) is arranged at the other end of the rotating plate (750).

5. A CPVC cable protection pipe with a pressure-resistant buffer structure according to claim 4, characterized in that: The docking assembly (760) includes a rotating engagement member (761) fixed to the surface of the rotating plate (750). An insertion tube (762) is fixed in the inner cavity of the rotating engagement member (761). A flaring tool (763) is provided at one end of the insertion tube (762). An insertion rod (764) is slidably provided in the inner cavity of the insertion tube (762). The insertion rod (764) and the hinge engagement member (654) are fixedly connected.

6. A CPVC cable protection pipe with a pressure-resistant buffer structure according to claim 5, characterized in that: The lifting and limiting assembly (800) includes a force-bearing block (810) that slides in the inner cavity of the insertion tube (762) and a groove (850) formed on the surface of the rotating plate (750). A connecting block (820) is fixed to the surface of the force-bearing block (810). A limiting rod (830) is slidably arranged in the inner cavity of the connecting block (820). Both ends of the limiting rod (830) are fixed to the surface of the wall groove of the insertion tube (762). A second spring (840) is fixed to the surface of the limiting rod (830). The other end of the second spring (840) is fixed to the surface of the wall groove of the insertion tube (762). The connecting block (820) is inclined.

7. A CPVC cable protection pipe with a pressure-resistant buffer structure according to claim 5, characterized in that: The stabilizing assembly (900) includes a piston head (910) that slides within the cavity of the insertion rod (764). One end of the piston head (910) is fixed with a slide rod (920), and the other end of the slide rod (920) is fixed with a support column (930). An air supply assembly (940) is provided within the cavity of the slide rod (920).

8. A CPVC cable protection pipe with a pressure-resistant buffer structure according to claim 7, characterized in that: The air delivery assembly (940) includes a connecting hole (941) opened in the inner cavity of the slide rod (920), the connecting hole (941) passes through the slide rod (920) and connects to the outside, the other end of the connecting hole (941) is connected to a connecting air tube (942), and the other end of the connecting air tube (942) is connected to an air bag (943).

9. A CPVC cable protection pipe with a pressure-resistant buffer structure according to claim 8, characterized in that: The intermediate stabilizing component (1000) includes several stabilizing columns (1020) fixed to the inner cavity of the transition tube (300), and the other end of the several stabilizing columns (1020) is fixed to a central stabilizing tube (1010). The central stabilizing tube (1010) and the transition tube (300) are coaxially arranged. The airbag (943) is fixed to the inner side of the central stabilizing tube (1010), and the support column (930) is fixed to the surface of the central stabilizing tube (1010).

10. A CPVC cable protection pipe with a pressure-resistant buffer structure according to claim 2, characterized in that: The reinforcing component (1100) includes a fixing plate (1110) fixed to the end face of the two pressing plates (610). The surface of the fixing plate (1110) is provided with a plurality of bolt holes (1120), and the surface of the bolt holes (1120) is engaged with an internal angle bolt (1130).

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