A cable joint protection box and its usage method

Abstract

This invention relates to the field of cable splicing technology, and more particularly to a cable joint protection box and its usage method. A cable joint protection box includes a first protection box, a second protection box, a first connector, a second connector, and a protection section. Both the first and second protection boxes have a start side and an end side. The first connector is guided and movably connected to the first protection box within the first protection box, and the second connector is guided and movably connected to the second protection box within the second protection box. Both connectors are used for electrical connection with cables. This invention only requires screwing the first and second boxes to the designated positions, resulting in high installation efficiency. It ensures that the center lines of the cables in the first cable trench and the cables on the first connector are collinear, and the center lines of the cables in the second cable trench and the cables on the second connector are collinear, preventing connection failure between the cables and connectors. Telescopic rods apply force to ensure effective contact between the cables and connectors.

Description

Technical Field

[0001] This invention relates to the field of cable connection technology, and in particular to a cable joint protection box and its usage method. Background Technology

[0002] In recent years, with the acceleration of urbanization in my country, the power industry has also developed rapidly. Because overhead cables can affect the aesthetics of cities, and there are many limitations on erecting poles and towers, cable installation is generally done by underwater laying or direct burial. This has led to an increasing number of cable joints, and cable joint protection boxes are usually needed to protect these joints during cable connection.

[0003] According to research, existing cable joint protection boxes typically require multiple bolts and nuts for installation, resulting in low overall installation efficiency. Furthermore, due to their internal structural design, the center lines of the two cables are not collinear, making them prone to torsional forces caused by cable twisting, which can lead to overall cable connection failure. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a cable joint protection box and its usage method to solve the technical problems of low overall installation efficiency and easy failure of the overall cable connection due to torsional force caused by cable twisting.

[0005] The present invention adopts the following technical solution.

[0006] A cable joint protection box,

[0007] The system includes a first protection box, a second protection box, a first connector, a second connector, and a protective section. Both the first and second protection boxes have a start side and an end side. The first connector is guided and movably connected to the first protection box within the first protection box, and the second connector is guided and movably connected to the second protection box within the second protection box. Both connectors are used for electrical connection to a cable. The protective section includes a connecting part, a first constraint part, and a second constraint part. The connecting part connects the first and second protection boxes together. The first constraint part includes a first constraint member and a first telescopic rod. The first constraint member is guided and movably connected to the first protection box within the first protection box. A first constraint member is located between the first connector and the first protective box, with a cable trench 1 excavated on its surface. A second telescopic rod is located between the first protective box and the first constraint member, used to facilitate the movement of the first constraint member. The second constraint member includes a second constraint member and a second telescopic rod. The second constraint member is guided and movably connected to the second protective box within the second protective box. The second constraint member is located between the second connector and the second protective box, with a cable trench 2 excavated on its surface. Both the first and second cable trenches are used to constrain the cable. The second telescopic rod is located between the second protective box and the second constraint member, used to facilitate the movement of the second constraint member.

[0008] As an improvement, when the first protective box and the second protective box are connected, the side of the first connecting head near the second connecting head is inside the second connecting head and in contact with the second connecting head. A base is arranged on the surface of the first connecting head near the first restraint member, and the second connecting head is in contact with the base.

[0009] As an improvement, a constraint sleeve is arranged on the inner surface of the first protective box, and a guide groove is dug on the inner surface of the first constraint sleeve. The guide groove is located on the inner surface of the first constraint sleeve away from the beginning of the second protective box. The outer dimensions of the base correspond to the inner dimensions of the first constraint sleeve. The base and the first constraint sleeve are guided and movably connected. A protrusion is arranged on the surface of the base, and the protrusion is guided and movably connected to the first guide groove. A constraint sleeve is arranged on the inner surface of the second protective box, and a guide groove is dug on the inner surface of the second constraint sleeve. The guide groove is located on the inner surface of the second constraint sleeve away from the beginning of the second protective box. A protrusion is arranged on the surface of the second connector, and the protrusion is guided and movably connected to the second guide groove.

[0010] As an improvement, on the inner side of the first protective box, a fixed groove, a connecting groove, and a constraint groove are arranged in sequence from its end side toward the side closer to the first constraint sleeve. The fixed groove is connected to the constraint groove via the connecting groove. The constraint member is guided and movably connected to the constraint groove. The center lines of the fixed groove, the connecting groove, and the cable groove are collinear. On the inner side of the second protective box, a fixed groove, a connecting groove, and a constraint groove are arranged in sequence from its end side toward the side closer to the second constraint sleeve. The fixed groove is connected to the constraint groove via the connecting groove and the constraint groove. The axes of the fixed groove and the connecting groove coincide with the axis of the second groove on the constraint member.

[0011] As an improvement, the constraint part one further includes a sealing element one, a washer one, and a box cover one. The sealing element one is guided and movably connected to the fixing groove one, the washer one is guided and movably connected to the connecting groove one, the telescopic rod one is fixedly connected to the washer one, and the side of the telescopic rod one away from the washer one contacts the constraint element one. An internal thread one is arranged on one side of the box cover one, and an external thread one that mates with the internal thread one is arranged on one side of the protective box one. The box cover one and the protective box one are connected by the internal thread one and the external thread one. The center line of the box cover one is aligned with the center of the fixing groove one. The center lines are collinear. The second constraint part also includes a second sealing component, a second washer, and a second cover. The second sealing component is guided and movably connected to the second fixed groove. The second washer is guided and movably connected to the second connecting groove. The second telescopic rod is fixedly connected to the second washer. One side of the second telescopic rod is in contact with the second constraint component. One side of the first cover is provided with a second internal thread. One side of the second protective box is provided with a second external thread that cooperates with the second internal thread. The second cover and the second protective box are connected by the second internal thread and the second external thread. The center line of the second cover is collinear with the center line of the second fixed groove.

[0012] As an improvement, a guide trench is dug on the first constraint trench, and a constraint strip is arranged on the first constraint member. The first constraint strip is movably connected to the first guide trench. A second guide trench is dug on the second constraint trench, and a second constraint strip is arranged on the second constraint member. The second constraint strip is movably connected to the second guide trench.

[0013] As an improvement, a connecting slope is dug between the first fixed ditch and the first connecting ditch, with the first connecting slope facing the first fixed ditch; a connecting slope is dug between the second fixed ditch and the second connecting ditch, with the second connecting slope facing the second fixed ditch.

[0014] As an improvement, a connecting rod is arranged on the starting side of the second protective box, the center line of the connecting rod is collinear with the center line of the second protective box, a through groove is dug on the inner side of the connecting rod, the through groove is connected to the second constraint groove, and the second connecting head is guided and movably connected to the through groove. A connecting hole is arranged on the starting side of the first protective box, the connecting hole is connected to the first constraint groove, the connecting rod is guided and movably connected to the connecting hole, and the outer dimension of the connecting rod corresponds to the inner dimension of the connecting hole.

[0015] As an improvement, the connecting part includes a connecting platform one and a connecting platform two. The connecting platform one is located on the outside of the protective box one. A guide rail is cut out on the side of the connecting platform one near the connecting platform two. The guide rail passes through the connecting platform one. The connecting platform two is located on the outside of the protective box one. A connecting strip is arranged on the side of the connecting platform two near the connecting platform one. A limiting member is arranged on the side of the connecting strip near the connecting platform one. The cross-sectional area of ​​the limiting member is higher than the cross-sectional area of ​​the connecting strip. A connecting slope three is cut out on the surface of the limiting member. The connecting slope three faces the connecting platform one. Under the guidance of the guide rail, the limiting member can move along it.

[0016] A method of using a cable joint protection box includes the following steps:

[0017] Step 1: Insert a cable into the box cover 1, sealing component 1, and washer 1 in sequence. Then connect the cable to connector 1. Place the part of the cable connected to connector 1 into constraint component 1. The constraint component 1 contacts connector 1. Place connector 1 and constraint component 1 into protective box 1. This will cause washer 1 to move in connecting groove 1. Rotate washer 1. The telescopic rod 1 contacts constraint component 1. Send sealing component 1 into fixed groove 1. The telescopic rod 1 is compressed and retracts. Tighten box cover 1 to the end side of protective box 1.

[0018] Step 2: Insert the other cable into the cover 2, the sealing part 2, and the washer 2 in sequence. Connect this cable to the connector 2. Wrap the cable with the constraint part 2. Place the connector 2 and the constraint part 2 into the protective box 2. This will cause the washer 2 to move into the connecting groove 2. The telescopic rod 2 and the constraint part 2 will come into contact, causing the cover 2 to move along the cable. The cover 2 will cause the sealing part 2 to come into the fixed groove 2. When the cover 2 and the end side of the protective box 2 come into contact, rotate the cover 2 to screw the cover 2 to the end side of the cover 2.

[0019] Step 3: Place the connecting rod on the second protective box into the connecting hole of the first protective box. The second connecting head extends into the first connecting head. Then, move the first protective box towards the second protective box. The bases on the first and second connecting heads contact each other. The first and second connecting heads each drive the first and second restraints to move in opposite directions along the extension of the first protective box. The first and second telescopic rods are compressed and contracted. When the connecting strip is close to the guide rail, rotate the first or second protective box to ensure that the connecting strip faces the guide rail. Move the first protective box towards the second protective box again. Release the first and second protective boxes. The first and second telescopic rods extend so that the limiting member contacts the first connecting platform, completing the overall connection.

[0020] The beneficial effects of this invention are that, compared with the prior art,

[0021] 1. This invention eliminates the need to tighten multiple bolts and nuts during installation; simply tighten the first and second cover boxes to the designated positions, resulting in high installation efficiency.

[0022] 2. By arranging constraint component one and constraint component two, this invention ensures that the center lines of the cables in cable trench one and the cables on connector one are collinear, and the center lines of the cables in cable trench two and the cables on connector two are collinear, thus preventing the torsional force caused by cable torsion from causing the connection failure between the cable and connector one and connector two.

[0023] 3. When telescopic rod one and telescopic rod two come into contact with connector one and connector two, they are squeezed and contracted, and a force is applied to make connector one and connector two stick together tightly, ensuring effective contact between the cable, connector one and connector two. Attached Figure Description

[0024] Figure 1 This is an exploded view of the present invention;

[0025] Figure 2 This is a three-dimensional schematic diagram of the present invention;

[0026] Figure 3 This is a schematic diagram of the internal structure of the present invention;

[0027] Figure 4 This is an enlarged schematic diagram of point A in the present invention;

[0028] Figure 5 This is an enlarged schematic diagram of point B in the present invention;

[0029] Figure 6 This is an enlarged schematic diagram of point C in the present invention;

[0030] Figure 7 This is a schematic diagram of the interior of the protective box of the present invention;

[0031] Figure 8 This is a schematic diagram of the interior of the second protective box of the present invention;

[0032] Figure 9 This is a three-dimensional schematic diagram of the first constraint component of the present invention;

[0033] Figure 10 This is a three-dimensional schematic diagram of the second constraint component of the present invention.

[0034] 211. Protective Box 1; 212. Connector 1; 213. Constraint 1; 214. Fixing Groove 1; 215. Connecting Groove 1; 216. Constraint Groove 1; 217. Constraint Sleeve 1; 218. Protrusion 1; 219. Guide Groove 1; 2110. Base; 221. Guide Groove 1; 222. Constraint Strip 1; 223. Connecting Rod; 311. Protective Box 2; 312. Connector 2; 313. Constraint 2; 314. Fixing Groove 2; 315. Connecting Groove 2; 316. Constraint 317. Ditch 2; 318. Constraint sleeve 2; 319. Guide ditch 2; 3110. Protrusion 2; 321. Guide ditch 2; 322. Constraint strip 2; 323. Connecting hole; 324. Through ditch; 415. Sealing part 1; 416. Washer 1; 417. Sealing part 2; 418. Telescopic rod 1; 419. Telescopic rod 2; 511. Connecting platform 1; 512. Connecting platform 2; 513. Guide rail; 514. Connecting strip. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, other embodiments obtained by those skilled in the art without creative effort are all within the protection scope of this invention.

[0036] Example 1

[0037] A cable joint protection box,

[0038] The system includes a first protective box 211, a second protective box 311, a first connector 212, a second connector 312, and a protective section. Both the first and second protective boxes 211 have a start side and an end side. The first connector 212 is guided and movably connected to the first protective box 211 within the first protective box 211. The second connector 312 is also guided and movably connected to the second protective box 311 within the second protective box 311. Both connectors 212 and 312 are used for electrical connection with cables. The protective section includes a connecting section, a first constraint section, and a second constraint section. The connecting section connects the first and second protective boxes 211 together. The first constraint section includes a first constraint member 213 and a first telescopic rod 418. The first constraint member 213 is guided and movably connected to the first protective box 211 within the first protective box 211. The first constraint member 213 is located at the first connector... In the starting side of 212 and the first protective box 211, the surface of the first constraint member 213 has a cable trench. The first telescopic rod 418 is located between the end side of the first protective box 211 and the first constraint member 213, and is used to promote the movement of the first constraint member 213. The second constraint part includes the second constraint member 313 and the second telescopic rod 419. The second constraint member 313 is guided and connected to the second protective box 311 inside the second protective box 311. The second constraint member 313 is located between the second connector 312 and the end side of the second protective box 311. The surface of the second constraint member 313 has a cable trench. Both the first cable trench and the second cable trench are used to constrain the cable. The second telescopic rod 419 is located between the end side of the second protective box 311 and the second constraint member 313, and is used to promote the movement of the second constraint member 313. Both the first constraint member 213 and the second constraint member 313 are made of highly elastic polymer material.

[0039] In a preferred but non-limiting embodiment of the present invention, when the first protective box 211 and the second protective box 311 are connected, the first connecting head 212 is located inside the second connecting head 312 and in contact with the second connecting head 312 on the side near the first connecting head 212. A base 2110 is arranged on the surface of the first connecting head 212 near the first restraint member 213, and the second connecting head 312 is in contact with the base 2110.

[0040] Connector 1 (212) and connector 2 (312) are connected to two cables respectively. Connector 1 (212) is placed inside protection box 1 (211), and connector 2 (312) is placed inside protection box 2 (311). Protection box 1 (211) is connected to protection box 2 (311) via a connecting part. Connector 1 (212) and connector 2 (312) are in contact. Constraints 1 (213) and 2 (313) are arranged to ensure that the center lines of the cables in cable trench 1 and the cables on connector 1 (212) are collinear, and the center lines of the cables in cable trench 2 and the cables on connector 2 (312) are collinear. To prevent the torsional force caused by the twisting of the cable from causing the connection failure between the cable and connector 212 and connector 312, connector 212 and connector 312 come into contact, making the cable, connector 212 and connector 312 conductive. When connector 212 and connector 312 come into contact, telescopic rod 418 and telescopic rod 419 are squeezed and contracted, and a force is applied to make connector 212 and connector 312 stick together, ensuring effective contact between connector 212 and connector 312.

[0041] In a preferred but non-limiting embodiment of the present invention, a constraint sleeve 217 is arranged on the inner surface of the protective box 211. A guide groove 219 is formed on the inner surface of the constraint sleeve 217, located away from the starting side of the protective box 211. The outer dimensions of the base 2110 correspond to the inner dimensions of the constraint sleeve 217. The base 2110 and the constraint sleeve 217 are guided and movably connected. The surface of the second protective box 311 is provided with a protrusion 218, which is guided and movably connected to the guide groove 219. The inner surface of the second protective box 311 is provided with a constraint sleeve 317, and the inner surface of the constraint sleeve 317 is provided with a guide groove 318. The guide groove 318 is located on the inner surface of the constraint sleeve 317 away from the starting side of the second protective box 311. The surface of the second connector 312 is provided with a protrusion 319, which is guided and movably connected to the guide groove 318.

[0042] In a preferred but non-limiting embodiment of the present invention, the inner side of the first protective box 211 is arranged with a fixing groove 214, a connecting groove 215, and a constraint groove 216 in sequence from its end side toward the side near the first constraint sleeve 217. The fixing groove 214 is connected to the constraint groove 216 via the connecting groove 215. The constraint member 213 is guided and movably connected to the constraint groove 216. The center lines of the fixing groove 214, the connecting groove 215, and the cable trench 211 are collinear. The inner side of the second protective box 311 is arranged with a fixing groove 314, a connecting groove 315, and a constraint groove 316 in sequence from its end side toward the side near the second constraint sleeve 317. The fixing groove 314 is connected to the constraint groove 316 via the connecting groove 315. The axes of the fixing groove 314 and the connecting groove 315 coincide with the axis of the second groove on the constraint member 313.

[0043] In a preferred but non-limiting embodiment of the present invention, the constraint part one further includes a sealing member one 412, a washer one 413, and a box cover one 414. The sealing member one 412 is guided and movably connected to the fixing groove one 214, the washer one 413 is guided and movably connected to the connecting groove one 215, the telescopic rod one 418 is fixedly connected to the washer one 413, and the side of the telescopic rod one 418 away from the washer one 413 contacts the constraint member one 213. An internal thread one is arranged on one side of the box cover one 414, and an external thread one that cooperates with the internal thread one is arranged on one side of the protective box one 211. The box cover one 414 and the protective box one 211 are connected by the internal thread one and the external thread one. The center line of the box cover one 414 is collinear with the center line of the fixing groove one 214. When the box cover one 414 rotates relative to the protective box one 211, the box cover one 414 applies a force to the sealing member one 412, and the sealing member one 412 is subjected to force. The deformation seals the surrounding gaps. The second constraint part also includes a second sealing member 415, a second washer 416, and a second cover 417. The second sealing member 415 is guided and movably connected to the second fixing groove 314. The second washer 416 is guided and movably connected to the second connecting groove 315. The second telescopic rod 419 is fixedly connected to the second washer 416. One side of the second telescopic rod 419 is in contact with the second constraint member 313. The second cover 414 has an internal thread 2 on one side. The protective box 311 has an outer thread 2 that cooperates with the inner thread 2 on one side. The cover 417 is connected to the protective box 311 by the inner thread 2 and the outer thread 2. The center line of the cover 417 is collinear with the center line of the fixing groove 314. When the cover 417 rotates over the protective box 311, the cover 417 applies a force to the sealing member 415. The sealing member 415 deforms under the force to seal the surrounding gaps.

[0044] In a preferred but non-limiting embodiment of the present invention, a guide trench 221 is dug on the first constraint trench 216, a constraint strip 222 is arranged on the first constraint member 213, and the constraint strip 222 is guided and movably connected to the first guide trench 221. A guide trench 3110 is dug on the second constraint trench 316, a constraint strip 321 is arranged on the second constraint member 313, and the constraint strip 321 is guided and movably connected to the second guide trench 3110.

[0045] In a preferred but non-limiting embodiment of the present invention, a connecting slope is dug between the first fixed trench 214 and the first connecting trench 215, the first connecting slope facing the first fixed trench 214, and a connecting slope is dug between the second fixed trench 314 and the second connecting trench 315, the second connecting slope facing the second fixed trench 314.

[0046] In a preferred but non-limiting embodiment of the present invention, a connecting rod 223 is arranged on the starting side of the second protective box 311, the center line of the connecting rod 223 is collinear with the center line of the second protective box 311, a through groove 323 is dug on the inner side of the connecting rod 223, the through groove 323 communicates with the second constraint groove 316, the second connecting head 312 is guided and movably connected to the through groove 323, a connecting hole 322 is arranged on the starting side of the first protective box 211, the connecting hole 322 communicates with the first constraint groove 216, the connecting rod 223 is guided and movably connected to the connecting hole 322, and the outer dimension of the connecting rod 223 corresponds to the inner dimension of the connecting hole 322.

[0047] In a preferred but non-limiting embodiment of the present invention, the connecting part includes a first connecting platform 512 and a second connecting platform 513. The first connecting platform 512 is located on the outer side of the first protective box 211. A guide rail 514 is cut out on the side of the first connecting platform 512 near the second connecting platform 513. The guide rail 514 passes through the first connecting platform 512. The second connecting platform 513 is located on the outer side of the first protective box 211. A connecting strip 515 is arranged on the side of the second connecting platform 513 near the first connecting platform 512. The connecting strip 515 is deformable. A limiting member is arranged on the side of the connecting strip 515 near the first connecting platform 512. The cross-sectional area of ​​the limiting member is higher than that of the connecting strip 515. A third connecting slope is cut out on the surface of the limiting member. The third connecting slope faces the first connecting platform 512. Under the guidance of the guide rail 514, the limiting member can move along it.

[0048] Example 2

[0049] A method of using a cable joint protection box includes the following steps:

[0050] Step 1: Insert a cable into the cover 414, sealing member 412, and washer 413 in sequence. Then connect the cable to connector 212. Place the portion of the cable connected to connector 212 into constraint member 213, ensuring contact between constraint member 213 and connector 212. Place connector 212 and constraint member 213 into protective box 211, causing constraint member 213 to enter the protective box 211. Constraint member 213 causes connector 212 to move within the protective box 211. Connector 212 passes sequentially through fixing groove 214, connecting groove 215, and constraint groove 216. When constraint member 213 enters constraint groove 216, constraint bar 222 moves into guide groove 221. Then, the constraint member 213 moves, which in turn causes the connector 212 to move. The connector 212 penetrates the constraint sleeve 217 into the connector hole 322, and the protrusion 218 moves into the guide groove 219. The connector 212 and the constraint member 213 can only move along the extension direction of the protective box 211. Then, the washer 413 moves in the connector groove 215. Rotating the washer 413 causes the telescopic rod 418 to contact the constraint member 213, which sends the sealing member 412 into the fixing groove 214. The telescopic rod 418 is compressed and retracts, and the resistance to the upward movement of the constraint member 213 and the connector 212 in the extension of the protective box 211 increases. The box cover 414 is screwed onto the end side of the protective box 211.

[0051] Step 2: Insert the other cable into the box cover 417, sealing piece 415, and washer 416 in sequence. Connect this cable to connector 312. Wrap the cable with restraint piece 313. Place connector 312 and restraint piece 313 into the protective box 311. Connector 312 passes through the fixing groove 314, connecting groove 315, restraint groove 316, and restraint sleeve 317 in sequence, finally moving into the through groove 323. Protrusion 319 moves into guide groove 318, and restraint piece 313 moves into restraint groove 316. If restraint piece 313... When the constraint bar 321 moves within the second constraint trench 316, the constraint bar 321 moves within the second guide trench 3110. The constraint member 313 and the connector 312 can only move along the extension direction of the protection box 311, causing the washer 416 to move into the second connecting trench 315. The telescopic rod 419 and the constraint member 313 come into contact, causing the cover 417 to move along the cable. The cover 417 causes the sealing member 415 to come into the second fixing trench 314. When the cover 417 comes into contact with the end side of the protection box 311, rotate the cover 417 to screw the cover 417 to the end side.

[0052] Step 3: Insert the connecting rod 223 on the second protective box 311 into the connecting hole 322 of the first protective box 211. The second connecting head 312 extends into the first connecting head 212. Then, the first protective box 211 moves towards the second protective box 311. The base 2110 on the first connecting head 212 and the second connecting head 312 contacts each other. The first connecting head 212 and the second connecting head 312 each drive the first restraint 213 and the second restraint 313 to move in opposite directions along the extension of the first protective box 211. The first telescopic rod 418 and the second telescopic rod 419 are compressed and retract. When the connecting bar 515 approaches the guide rail 514, rotate the first protective box 211 or the second protective box 311. 1. Ensure that the connecting strip 515 faces the guide rail 514, and then cause the first protective box 211 to move towards the second protective box 311. The part of the limiting member first enters the guide rail 514, and then the connecting slope 3 on the limiting member initially contacts the guide rail 514. Subsequently, the limiting member moves along the guide rail 514. There is a force between the limiting member and the guide rail 514, and the connecting strip 515 bends. After the limiting member leaves the guide rail 514, the connecting strip 515 begins to return to its initial position. Release the first protective box 211 and the second protective box 311. The first telescopic rod 418 and the second telescopic rod 419 extend so that the limiting member and the first connecting platform 512 come into contact, completing the overall connection.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A cable joint protection box, characterized in that: The system includes a first protection box, a second protection box, a first connector, a second connector, and a protective section. Both the first and second protection boxes have a start side and an end side. The first connector is guided and movably connected to the first protection box within the first protection box, and the second connector is guided and movably connected to the second protection box within the second protection box. Both connectors are used for electrical connection to a cable. The protective section includes a connecting part, a first constraint part, and a second constraint part. The connecting part connects the first and second protection boxes together. The first constraint part includes a first constraint member and a first telescopic rod. The first constraint member is guided and movably connected to the first protection box within the first protection box. A first constraint member is located between the first connector and the first protective box, with a cable trench 1 excavated on its surface. A second telescopic rod is located between the first protective box and the first constraint member, used to facilitate the movement of the first constraint member. The second constraint member includes a second constraint member and a second telescopic rod. The second constraint member is guided and movably connected to the second protective box within the second protective box. The second constraint member is located between the second connector and the second protective box, with a cable trench 2 excavated on its surface. Both the first and second cable trenches are used to constrain the cable. The second telescopic rod is located between the second protective box and the second constraint member, used to facilitate the movement of the second constraint member.

2. The cable joint protection box according to claim 1, characterized in that: When the first protective box and the second protective box are connected, the side of the first connecting head near the second connecting head is inside the second connecting head and in contact with the second connecting head. A base is arranged on the surface of the first connecting head near the first restraint member, and the second connecting head is in contact with the base.

3. A cable joint protection box according to claim 2, characterized in that: The inner surface of the first protective box is provided with a constraint sleeve, and the inner surface of the first constraint sleeve is provided with a guide groove. The guide groove is located on the inner surface of the first constraint sleeve away from the beginning of the first protective box. The outer dimensions of the base correspond to the inner dimensions of the first constraint sleeve. The base and the first constraint sleeve are guided and movably connected. The surface of the base is provided with a protrusion, which is guided and movably connected to the first guide groove. The inner surface of the second protective box is provided with a constraint sleeve, and the inner surface of the second constraint sleeve is provided with a guide groove. The guide groove is located on the inner surface of the second constraint sleeve away from the beginning of the second protective box. The surface of the second connector is provided with a protrusion, which is guided and movably connected to the second guide groove.

4. A cable joint protection box according to claim 3, characterized in that: On the inner side of the first protective box, from its end side towards the side closer to the first constraint sleeve, a first fixed groove, a first connecting groove, and a first constraint groove are arranged in sequence. The first fixed groove is connected to the first constraint groove via the first connecting groove. The first constraint member is guided and movably connected to the first constraint groove. The center lines of the first fixed groove, the first connecting groove, and the first cable groove are collinear. On the inner side of the second protective box, from its end side towards the side closer to the second constraint sleeve, a second fixed groove, a second connecting groove, and a second constraint groove are arranged in sequence. The second fixed groove is connected to the second constraint groove via the second connecting groove. The axes of the second fixed groove and the second connecting groove coincide with the axis of the second groove on the second constraint member.

5. A cable joint protection box according to claim 4, characterized in that: The constraint part one also includes a sealing component one, a washer one, and a box cover one. The sealing component one is guided and movably connected to the fixing groove one. The washer one is guided and movably connected to the connecting groove one. The telescopic rod one is fixedly connected to the washer one. The side of the telescopic rod one away from the washer one is in contact with the constraint component one. An internal thread one is arranged on one side of the box cover one. An external thread one that mates with the internal thread one is arranged on one side of the protective box one. The box cover one and the protective box one are connected by the internal thread one and the external thread one. The center line of the box cover one is aligned with the center line of the fixing groove one. The second constraint part also includes a second sealing component, a second washer, and a second cover. The second sealing component is guided and movably connected to the second fixed groove. The second washer is guided and movably connected to the second connecting groove. The second telescopic rod is fixedly connected to the second washer. One side of the second telescopic rod is in contact with the second constraint component. One side of the first cover is provided with an inner thread second. One side of the second protective box is provided with an outer thread second that cooperates with the inner thread second. The second cover and the second protective box are connected by the inner thread second and the outer thread second. The center line of the second cover and the center line of the second fixed groove are collinear.

6. A cable joint protection box according to claim 4, characterized in that: A guide trench is dug on the first constraint trench, and a constraint strip is arranged on the first constraint member. The first constraint strip is movably connected to the first guide trench. A second guide trench is dug on the second constraint trench, and a second constraint strip is arranged on the second constraint member. The second constraint strip is movably connected to the second guide trench.

7. A cable joint protection box according to claim 4, characterized in that: A connecting slope is dug between the first fixed ditch and the first connecting ditch, with the first connecting slope facing the first fixed ditch. A connecting slope is dug between the second fixed ditch and the second connecting ditch, with the second connecting slope facing the second fixed ditch.

8. A cable joint protection box according to claim 4, characterized in that: A connecting rod is arranged on the starting side of the second protective box. The center line of the connecting rod is collinear with the center line of the second protective box. A through groove is dug on the inner side of the connecting rod. The through groove is connected to the second constraint groove. The second connecting head is guided and movably connected to the through groove. A connecting hole is arranged on the starting side of the first protective box. The connecting hole is connected to the first constraint groove. The connecting rod is guided and movably connected to the connecting hole. The outer dimension of the connecting rod corresponds to the inner dimension of the connecting hole.

9. A cable joint protection box according to claim 1, characterized in that: The connecting part includes a connecting platform one and a connecting platform two. The connecting platform one is located on the outside of the protective box one. A guide rail is cut out on the side of the connecting platform one near the connecting platform two. The guide rail passes through the connecting platform one. The connecting platform two is located on the outside of the protective box one. A connecting strip is arranged on the side of the connecting platform two near the connecting platform one. A limiting member is arranged on the side of the connecting strip near the connecting platform one. The cross-sectional area of ​​the limiting member is higher than that of the connecting strip. A connecting slope three is cut out on the surface of the limiting member. The connecting slope three faces the connecting platform one. Under the guidance of the guide rail, the limiting member can move along it.

10. A method of using a cable joint protection box according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Insert a cable into the box cover 1, sealing part 1, and washer 1 in sequence. Then connect the cable to the connector 1. Place the part of the cable connected to the connector 1 into the constraint part 1. The constraint part 1 contacts the connector 1. Place the connector 1 and constraint part 1 into the protective box 1. This will cause the washer 1 to move in the connecting groove 1. Rotate the washer 1. The telescopic rod 1 contacts the constraint part 1. Send the sealing part 1 into the fixed groove 1. The telescopic rod 1 is compressed and retracts. Tighten the box cover 1 to the end side of the protective box 1. Step 2: Insert the other cable into the box cover 2, sealing part 2, and washer 2 in sequence. Connect this cable to connector 2. Wrap the cable with restraint part 2. Place connector 2 and restraint part 2 into the protective box 2. This will cause washer 2 to move into the connecting groove 2. Telescopic rod 2 and restraint part 2 will contact each other, causing box cover 2 to move along the cable. Box cover 2 will cause sealing part 2 to come into the fixed groove 2. When box cover 2 and the end side of the protective box 2 contact each other, rotate box cover 2 to screw box cover 2 to the end side of box cover 2. Step 3: Place the connecting rod on the second protective box into the connecting hole of the first protective box. The second connecting head extends into the first connecting head. Then, move the first protective box towards the second protective box. The bases on the first and second connecting heads contact each other. The first and second connecting heads each drive the first and second restraints to move in opposite directions along the extension of the first protective box. The first and second telescopic rods are compressed and contracted. When the connecting strip is close to the guide rail, rotate the first or second protective box to ensure that the connecting strip faces the guide rail. Move the first protective box towards the second protective box again. Release the first and second protective boxes. The first and second telescopic rods extend so that the limiting member contacts the first connecting platform, completing the overall connection.

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