MPP power cable protection tube and preparation method

Abstract

The present invention relates to the field of cable protection tubes and discloses an MPP power cable protection tube and a preparation method thereof, comprising a main protection tube, wherein one end of the main protection tube is movably connected to a secondary protection tube, and one end of the main protection tube close to the secondary protection tube is fixedly connected to a connecting assembly, a fixing assembly is fixedly installed inside the main protection tube, and the fixing assembly comprises a fixed cylinder, a movable plug is movably installed inside the fixed cylinder, a first support plate and a second support plate are fixedly installed at the bottom of an end of the fixed cylinder away from the movable plug, a movable fixing part is movably installed inside one end of the fixed cylinder, and the movable fixing part comprises a piston rod. The provision of the fixing assembly is conducive to fixing the power cable, and the piston principle is used, and the spring characteristics are used to control the movable fixing part, which is simple to operate. At the same time, the power cable is not in direct contact with the protection tube, and when the protection is corroded, the cable can be prevented from being corroded.

Description

Technical Field

[0001] The present invention relates to the field of cable protection tubes, and more particularly to an MPP power cable protection tube and a preparation method thereof. Background Art

[0002] MPP power pipes are divided into ordinary type and reinforced type. The reinforced type is further divided into trenchless pipes and trenchless pipes. The so-called MPP trenchless pipes are also called MPP jacking pipes, MPP dragging pipes, and MPP traction pipes. Modified polypropylene (MPP) power pipes have the characteristics of high temperature resistance and external pressure resistance. They are suitable for high-voltage transmission line and cable pipes above 10KV. They can be widely used in municipal, telecommunications, electricity, gas, tap water, heat and other pipeline projects, urban and rural trenchless horizontal directional drilling power pipe projects and lighting excavation power pipe projects, urban and rural trenchless horizontal directional drilling sewerage and sewage pipe projects, and industrial wastewater discharge projects.

[0003] However, the power cables in the existing power cable protection tubes are mostly bunched together, and there is no fixing measure inside the protection tubes. Therefore, the power cables are easy to shake in the protection tubes, resulting in low stability of the power cables in the protection tubes, which in turn affects the use.

[0004] Secondly, when the power cable protection tube is subjected to external pressure, the surface of the protection tube cannot play an effective buffering role, which can easily cause the protection tube to be damaged. In the long run, it cannot provide comprehensive protection for the internal power cables, so the internal power cables are easily damaged. If the power cable is buried under the ground with a strong underground electric field, the protection tube will often be corroded, and the power cable is in direct contact with the inside of the protection tube, which can easily cause the lead sheath of the cable to corrode and penetrate, leading to moisture intrusion and insulation damage, so the protection of the internal power cable is poor.

[0005] In addition, the traditional MPP power cable protection pipe is butt-jointed by hot-melt welding with a welding machine. The welding point is around 200 degrees and cannot exceed 220 degrees. When the temperature is reached, the two ends can be butt-jointed. This connection method is still not as strong as the pipe body itself. The connection parts are prone to cracking after frequent squeezing, affecting normal use. Summary of the Invention

[0006] In order to overcome the above-mentioned defects of the prior art, the present invention provides an MPP power cable protection tube and a preparation method thereof to solve the problems existing in the above-mentioned background technology.

[0007] The present invention provides the following technical solutions: an MPP power cable protection tube and a preparation method thereof, comprising a main protective tube, the main protective tube comprising a tube body, a positioning piece fixedly installed inside the tube body, one end of the main protective tube movably connected to a secondary protective tube, the main protective tube being fixedly connected to an end of the secondary protective tube close to the secondary protective tube with a connecting assembly, the main protective tube being fixedly installed inside with a fixing assembly, the connecting assembly comprising an upper connecting piece, the bottom of the upper connecting piece being movably connected to a lower connecting piece, the upper connecting piece comprising a first main connecting piece, one side of the first main connecting piece being fixedly connected to a first main buffer, the other side of the first main connecting piece being fixedly connected to a first secondary buffer, the lower connecting piece comprising a second main connecting piece, one side of the second main connecting piece being fixedly connected to a second main buffer, the other side of the second main connecting piece being fixedly connected to a second secondary buffer, the first main connecting piece being movably connected to a nut by a bolt, both sides of the first main connecting piece are provided with an upper sliding groove, and both sides of the second main connecting piece are provided with The cam is fixedly provided with a first end in contact with the first supporting plate, and the second end in contact with the second supporting plate is fixedly provided with a first support plate and a second support plate at the other end of the fixing plate.

[0008] Furthermore, the area of ​​the connecting portion between the main protective tube and the first main connecting member and the second main connecting member is half of that of the first main connecting member and the second main connecting member.

[0009] Furthermore, the upper connecting member and the lower connecting member have the same structure, and the first main buffer member and the first auxiliary buffer member have the same structure.

[0010] Furthermore, threaded holes adapted to fit bolts are provided at both ends of the first main connecting member and the second main connecting member.

[0011] Furthermore, one end of the fixed plate and the sliding plate is located in the upper sliding groove, and the buffer spring can move in the upper sliding groove. The sponge does not contact the upper sliding groove, and the sponge is made of high-rebound sponge.

[0012] Furthermore, the diameter of the piston column is the same as the inner diameter of the fixed cylinder, the assisting block is fully adapted to the second groove and the cross section of the second groove is in a "convex" shape, and the second groove is connected to the first groove.

[0013] Furthermore, the number of the positioning members and the number of the moving fixing members are both four, and the positioning members and the semicircular plate can just form a cylinder.

[0014] Furthermore, each of the semicircular plates is fixedly connected to two push-pull springs, and both are located on both sides of the connecting column.

[0015] S1: Place the cable into the tube so that it is located between the positioning piece and the semicircular plate.

[0016] S2: Push the piston cover inward, and the piston column squeezes the air in the fixed cylinder through the piston rod, pushing the four thrust plates outward, and then pushing the semicircular plate close to the positioning piece through the connecting column to form a closed loop with it to fix the cable. At this time, the push-pull spring is in a stretched state, and the assist block is located in the first groove. Rotate the piston cover to make it enter the second groove, so that it is fixed by the second groove, and then fix the semicircular plate to prevent it from returning to its original position.

[0017] S3: Connect one end of the secondary protective tube to one end of the main protective tube, tighten the bolts and nuts to fix the main protective tube and the secondary protective tube. At this time, the sponge is close to the surface of the main protective tube and the secondary protective tube.

[0018] S4: When subjected to external pressure or significant impact, the sliding plate is squeezed first, compressing the buffer spring and driving the sliding plate to move in the upper sliding groove for the first buffering and shock absorption, and then the sponge is used for the second shock absorption and protection.

[0019] S5: When the internal cable needs to be replaced or removed, rotate the piston cover, thereby driving the assist block from the second groove into the first groove, and pull the piston cover outward. There is sufficient internal gas space. At this time, the rebound force of the push-pull spring acts to move the semicircular plate away from the positioning piece and return to its original position.

[0020] The technical effects and advantages of the present invention are as follows:

[0021] 1. The present invention is conducive to fixing the power cables by providing a fixing component. The four positioning parts and the semicircular plate can divide the bundled power cables into four equal parts, fix the power cables and prevent them from shaking. The piston principle is used and the spring characteristics are used to control the moving fixing parts. The operation is simple. At the same time, the power cables have no direct contact with the protective tube. When the protective tube is corroded, the cables can be prevented from being corroded.

[0022] 2. The present invention is beneficial to protecting the power cable by providing a connecting component. The sliding plate is the first layer of protection structure. When subjected to external pressure, it is buffered by the buffer spring, and the sponge provides the second layer of protection. When the power cable is buried under the ground with a strong underground electric field, the thickness of the second main buffer and the second auxiliary buffer can slow down the corrosion rate of the protective tube, extend the service life of the protective tube, and thus protect the internal cable.

[0023] 3. The present invention is provided with a connecting assembly, which is conducive to connecting the two ends of the cable protection tube through a movable connection, preventing the connecting part from being squeezed, and extending the service life of the protection tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 It is a schematic diagram of the overall structure of the present invention.

[0026] Figure 3 Schematic diagram of the connection assembly structure of the present invention.

[0027] Figure 4 It is a schematic structural diagram of the upper connecting member and the lower connecting member of the present invention.

[0028] Figure 5 This is a schematic structural diagram of the first main buffer component of the present invention.

[0029] Figure 6 It is a schematic diagram of the fixing component structure of the present invention.

[0030] Figure 7 It is a schematic diagram of the movable plug structure of the present invention.

[0031] Figure 8 This is the first cross-sectional view of the present invention.

[0032] Figure 9 It is a schematic diagram of the enlarged structure of point A of the present invention.

[0033] Figure 10 It is a schematic diagram of the enlarged structure of point B of the present invention.

[0034] Figure 11 This is a second cross-sectional view of the present invention.

[0035] The accompanying drawings are marked as follows: 1. Main protective tube; 11. Tube body; 12. Positioning member; 2. Secondary protective tube; 3. Connecting assembly; 31. Upper connecting member; 311. First main connecting member; 312. First main buffer member; 3121. Fixing plate; 3122. Buffer spring; 3123. Sliding plate; 3124. Sponge; 313. First secondary buffer member; 314. Upper sliding groove; 32. Lower connecting member; 321. Second main connecting member; 322. Second main buffer member; 323. , second auxiliary buffer; 324, lower sliding groove; 33, bolt; 34, nut; 4, fixing assembly; 41, fixed cylinder; 42, movable plug; 421, piston rod; 422, piston cover; 423, piston column; 424, assisting block; 43, first support plate; 44, second support plate; 45, moving fixing part; 451, semicircular plate; 452, connecting column; 453, thrust plate; 454, push-pull spring; 46, first groove; 47, second groove. DETAILED DESCRIPTION

[0036] The technical solutions of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. In addition, the various structural forms described in the following embodiments are merely examples, and the scope of protection of the MPP power cable protection tube and preparation method involved in the present invention is within the scope of the invention.

[0037] Reference Figure 1-11The present invention provides an MPP power cable protection tube and a preparation method thereof, comprising a main protection tube 1, the main protection tube 1 comprising a tube body 11, a positioning member 12 being fixedly installed inside the tube body 11, one end of the main protection tube 1 being movably connected to a secondary protection tube 2, the end of the main protection tube 1 close to the secondary protection tube 2 being fixedly connected to a connecting assembly 3, a fixing assembly 4 being fixedly installed inside the main protection tube 1, the connecting assembly 3 comprising an upper connecting member 31, the bottom of the upper connecting member 31 being movably connected to a lower connecting member 32, the inner diameter of the object formed by the upper connecting member 31 and the lower connecting member 32 being the same as the outer wall diameter of the main protection tube 1, so that there is no gap in the middle, thereby being able to fix the main protection tube 1 and the secondary protection tube 2 to the maximum extent, the upper connecting member 31 comprising a first main connecting member 311 The first main connecting member 311 is fixedly connected to the first main buffer member 312 on one side, and the first secondary buffer member 313 is fixedly connected to the other side of the first main connecting member 311. The lower connecting member 32 includes a second main connecting member 321, and the second main buffer member 322 is fixedly connected to the second main buffer member 322 on one side of the second main connecting member 321. The second secondary buffer member 323 is fixedly connected to the other side of the second main connecting member 321. The first main connecting member 311 is movably connected to the nut 34 by the bolt 33. The first main connecting member 311 and the second main connecting member 321 are fixed by the bolt 33 and the nut 34 to make them more stable. Upper sliding grooves 314 are provided on both sides of the first main connecting member 311, and lower sliding grooves 324 are provided on both sides of the second main connecting member 321. The buffer part 312 includes a fixed plate 3121, one side of the fixed plate 3121 is fixedly connected to one end of the buffer spring 3122, the other end of the buffer spring 3122 is fixedly connected to the sliding plate 3123, and a sponge 3124 is fixedly installed on the other side of the fixed plate 3121. The buffer spring 3122 is located in the middle of the sliding plate 3123, one end of the fixed plate 3121 is fixedly connected to the inner wall of the upper sliding groove 314, and the sliding plate 3123 is only in contact with the inner wall of the upper sliding groove 314 but not connected, so the sliding plate 3123 can play a buffering role. The fixing assembly 4 includes a fixed cylinder 41, and a movable plug 42 is movably installed inside the fixed cylinder 41. The bottom of the end of the fixed cylinder 41 away from the movable plug 42 is fixedly installed with a first support plate 43 and a second support plate The first support plate 43 and the second support plate 44 are fixedly connected to the fixed cylinder 41 at one end, and the other end of the first support plate 43 and the second support plate 44 are fixedly connected to the inner wall of the tube body 11 to ensure the stability of the fixed assembly 4. A movable fixing part 45 is movably installed inside one end of the fixed cylinder 41. The movable fixing part 45 and the first support plate 43 and the second support plate 44 are at the same end, and the first support plate 43 and the second support plate 44 are both located between the two movable fixing parts 45. The movable plug 42 includes a piston rod 421, one end of the piston rod 421 is fixedly connected to a piston cover 422, the other end of the piston rod 421 is fixedly connected to a piston column 423, and the side of the piston cover 422 close to the piston rod 421 is fixedly connected to an assist block 424.The moving fixture 45 includes a semicircular plate 451. The raised side of the semicircular plate 451 is fixedly connected to one end of a connecting post 452. The other end of the connecting post 452 is fixedly connected to a thrust plate 453. The side of the semicircular plate 451 near the connecting post 452 is fixedly connected to one end of a push-pull spring 454. A first groove 46 and a second groove 47 are formed on the side of the fixed cylinder 41 near the assist block 424. The push-pull spring 454 is two centimeters away from the connecting post 452.

[0038] In a preferred embodiment, the area of ​​the connecting portion between the main protective tube 1 and the first main connecting member 311 and the second main connecting member 321 is half of the area of ​​the first main connecting member 311 and the second main connecting member 321, so the other half can be connected to the secondary protective tube 2 to ensure the balance between the main protective tube 1 and the secondary protective tube 2.

[0039] In a preferred embodiment, the upper connecting member 31 and the lower connecting member 32 have the same structure, and the first main buffer member 312 and the first auxiliary buffer member 313 have the same structure, so the auxiliary protective tube 2 can be fully protected. When pressure is applied from both above and below, the main protective tube 1 and the auxiliary protective tube 2 can be fully protected.

[0040] In a preferred embodiment, threaded holes adapted to the bolts 33 are provided at both ends of the first main connecting member 311 and the second main connecting member 321 , so that the bolts 33 can be fixed in a threaded manner, with a good fixing effect.

[0041] In a preferred embodiment, one end of the fixed plate 3121 and the sliding plate 3123 are located in the upper sliding groove 314, and the buffer spring 3122 can move in the upper sliding groove 314, so that it can move in the upper sliding groove 314 when the buffer spring 3122 is compressed. The sponge 3124 does not contact the upper sliding groove 314, and the material of the sponge 3124 is a high-rebound sponge with a large open porosity. When under pressure, it will generate rebound forces with different supporting forces under different deformation states, and the protection effect is good.

[0042] In a preferred embodiment, the diameter of the piston column 423 is the same as the inner diameter of the fixed cylinder 41, which provides feasibility for the movement of the movable plug 42. The assisting block 424 is fully adapted to the second groove 47 and the cross-section of the second groove 47 is "convex" shaped. The second groove 47 is connected to the first groove 46, so the assisting block 424 can be fixed when it enters the second groove 47 from the first groove 46.

[0043] In a preferred embodiment, the number of the positioning members 12 and the number of the movable fixing members 45 are both four, and the positioning members 12 and the semicircular plates 451 can just form a cylinder, which can divide the cable into four parts for fixing, and the fixing effect is better.

[0044] In a preferred embodiment, each semicircular plate 451 is fixedly connected to two push-pull springs 454, and both are located on both sides of the connecting column 452. Therefore, the semicircular plate 451 can be returned to its original position through the elastic force of the push-pull spring 454, which facilitates the removal and replacement of the cable.

[0045] S1: Place the cable into the tube body 11 so that it is located between the positioning member 12 and the semicircular plate 451 .

[0046] S2: Push the piston cover 422 inward, and use the piston rod 421 to make the piston column 423 squeeze the air in the fixed cylinder 41, pushing the four thrust plates 453 to move outward, and then push the semicircular plate 451 toward the positioning member 12 through the connecting column 452, forming a closed loop with it to fix the cable. At this time, the push-pull spring 454 is in a stretched state, and the assist block 424 is located in the first groove 46. Rotate the piston cover 422 to make it enter the second groove 47, so that it is fixed by the second groove 47, and then fix the semicircular plate 451 to prevent it from returning to its original position.

[0047] S3: Connect one end of the secondary protective tube 2 to one end of the main protective tube 1, tighten the bolt 33 and the nut 34 to fix the main protective tube 1 and the secondary protective tube 2. At this time, the sponge 3124 is in close contact with the surface of the main protective tube 1 and the secondary protective tube 2.

[0048] S4: When subjected to external pressure or a significant impact, the sliding plate 3123 is squeezed first, and the buffer spring 3122 is compressed, driving the sliding plate 3123 to move in the upper sliding groove 314 for the first buffering and shock absorption, and then the sponge 3124 is used for the second shock absorption and protection.

[0049] S5: When the internal cable needs to be replaced or removed, rotate the piston cover 422, thereby driving the assist block 424 from the second groove 47 into the first groove 46, pulling the piston cover 422 outward. There is sufficient internal gas space. At this time, the rebound force of the push-pull spring 454 acts to move the semicircular plate 451 away from the positioning member 12 and return to its original position.

[0050] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense, and may refer to mechanical or electrical connections, internal communication between two components, or direct connection. "Up," "down," "left," and "right" are only used to indicate relative positional relationships. When the absolute positions of the objects being described change, the relative positional relationships may also change.

[0051] Secondly: The drawings of the embodiments disclosed in the present invention only involve structures related to the embodiments disclosed in the present invention. Other structures may refer to conventional designs. The same embodiment and different embodiments of the present invention may be combined with each other without conflict.

[0052] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An MPP power cable protection tube, comprising a main protection tube (1), characterized in that: The main protective tube (1) comprises a tube body (11), a positioning member (12) is fixedly installed inside the tube body (11), one end of the main protective tube (1) is movably connected to the secondary protective tube (2), one end of the main protective tube (1) close to the secondary protective tube (2) is fixedly connected to a connecting assembly (3), a fixing assembly (4) is fixedly installed inside the main protective tube (1), the connecting assembly (3) comprises an upper connecting member (31), the bottom of the upper connecting member (31) is movably connected to a lower connecting member (32), the upper connecting member (31) comprises a first main connecting member (311), one side of the first main connecting member (311) is fixedly connected to a first main buffer member (312), the other side of the first main connecting member (311) is fixedly connected to a first main buffer member (312), and the other side of the first main connecting member (311) is fixedly connected to a first main buffer member (312). The first main connecting member (311) is fixedly connected to the side with a first auxiliary buffer (313), the lower connecting member (32) includes a second main connecting member (321), one side of the second main connecting member (321) is fixedly connected to the second main buffer (322), the other side of the second main connecting member (321) is fixedly connected to the second auxiliary buffer (323), the first main connecting member (311) and the second main connecting member (321) are movably connected through bolts (33) and nuts (34), both sides of the first main connecting member (311) are provided with upper sliding grooves (314), both sides of the second main connecting member (321) are provided with lower sliding grooves (324), the first main buffer (312) includes a fixing plate (3121), the fixing plate One side of the (3121) is fixedly connected to one end of the buffer spring (3122), the other end of the buffer spring (3122) is fixedly connected to a sliding plate (3123), the other side of the fixed plate (3121) is fixedly installed with a sponge (3124), the fixed assembly (4) includes a fixed cylinder (41), a movable plug (42) is movably installed inside the fixed cylinder (41), a first support plate (43) and a second support plate (44) are fixedly installed at the bottom of one end of the fixed cylinder (41) away from the movable plug (42), a moving fixed part (45) is movably installed inside one end of the fixed cylinder (41), the movable plug (42) includes a piston rod (421), one end of the piston rod (421) is fixedly installed with a first support plate (43) and a second support plate (44), the movable fixed part (45) is movably installed inside one end of the fixed cylinder (41), the movable plug (42) includes a piston rod (421), one end of the piston rod (421) is fixedly installed with a first support plate (43) and a second support plate (44) A piston cover (422) is fixedly connected to the piston rod (421), the other end of the piston rod (421) is fixedly connected to the piston column (423), the side of the piston cover (422) close to the piston rod (421) is fixedly connected to the assisting block (424), the moving fixed member (45) includes a semicircular plate (451), the raised side of the semicircular plate (451) is fixedly connected to one end of the connecting column (452), the other end of the connecting column (452) is fixedly connected to the thrust plate (453), the side of the semicircular plate (451) close to the connecting column (452) is fixedly connected to one end of the push-pull spring (454), and the side of the fixed cylinder (41) close to the assisting block (424) is provided with a first groove (46) and a second groove (47).

2. The MPP power cable protection tube according to claim 1, characterized in that: The area of ​​the connection portion between the main protective tube (1) and the first main connecting piece (311) and the second main connecting piece (321) is half of that of the first main connecting piece (311) and the second main connecting piece (321).

3. The MPP power cable protection tube according to claim 1, characterized in that: The upper connecting member (31) and the lower connecting member (32) have the same structure, and the first main buffer member (312) and the first auxiliary buffer member (313) have the same structure.

4. The MPP power cable protection tube according to claim 1, characterized in that: Both ends of the first main connecting member (311) and the second main connecting member (321) are provided with threaded holes adapted to the bolts (33).

5. The MPP power cable protection tube according to claim 1, characterized in that: One end of the fixed plate (3121) and the sliding plate (3123) is located in the upper sliding groove (314), and the buffer spring (3122) can move in the upper sliding groove (314). The sponge (3124) does not contact the upper sliding groove (314), and the material of the sponge (3124) is a high-rebound sponge.

6. The MPP power cable protection tube according to claim 1, characterized in that: The diameter of the piston column (423) is the same as the inner diameter of the fixed cylinder (41), the assisting block (424) is fully adapted to the second groove (47), and the cross section of the second groove (47) is in a "convex" shape. The second groove (47) is connected to the first groove (46).

7. The MPP power cable protection tube according to claim 1, characterized in that: The number of the positioning members (12) and the number of the moving fixing members (45) are both four, and the positioning members (12) and the semicircular plate (451) can just form a cylinder.

8. The MPP power cable protection tube according to claim 1, characterized in that: Each of the semicircular plates (451) is fixedly connected to two push-pull springs (454), both of which are located on both sides of the connecting column (452).

9. The method for preparing the MPP power cable protection tube according to any one of claims 1 to 8, comprising the following steps: S1: Place the cable into the tube (11) so that it is located between the positioning member (12) and the semicircular plate (451); S2: Push the piston cover (422) inward, and make the piston column (423) squeeze the air in the fixed cylinder (41) through the piston rod (421), push the four thrust plates (453) outward, and then push the semicircular plate (451) toward the positioning member (12) through the connecting column (452), forming a closed loop with it, and fixing the cable. At this time, the push-pull spring (454) is in a stretched state, and the assist block (424) is located in the first groove (46). The piston cover (422) is rotated to enter the second groove (47), so that it is fixed by the second groove (47), and then the semicircular plate (451) is fixed to prevent it from returning to its original position; S3: Connect one end of the secondary protective tube (2) to one end of the main protective tube (1), tighten the bolt (33) and the nut (34), and fix the main protective tube (1) and the secondary protective tube (2). At this time, the sponge (3124) is in close contact with the surface of the main protective tube (1) and the secondary protective tube (2); S4: When subjected to external pressure or a significant impact, the sliding plate (3123) is first squeezed, and the buffer spring (3122) is compressed, driving the sliding plate (3123) to move in the upper sliding groove (314), performing the first buffering and shock absorption, and then the sponge (3124) performs the second shock absorption and protection; S5: When the internal cable needs to be replaced or removed, the piston cover (422) is rotated, thereby driving the assist block (424) from the second groove (47) into the first groove (46), and pulling the piston cover (422) outward. When there is sufficient internal gas space, the rebound force of the push-pull spring (454) causes the semicircular plate (451) to move away from the positioning member (12) and return to its original position.

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