Prefabricated branch cable

Abstract

The invention discloses a prefabricated branch cable, and relates to the technical field of cables. The device further comprises a wire inlet pipe and a protective shell. A main cable is fixedly inserted into the wire inlet pipe, the bottom end of the main cable penetrates through the bottom end of the wire inlet pipe, a branch cable is connected to the side face of the main cable, the joint of the branch cable and the main cable is wrapped with a protection piece, an installation cavity is formed in the protection shell, and the protection piece is fixedly connected into the installation cavity. The top end of the wire inlet pipe penetrates through the top wall of the protection shell. According to the prefabricated branch cable, the protection shell, the mounting cavity and the first buffer assembly are arranged, so that when the branch cable receives external pulling force, the arc-shaped plate elastically slides, the situation that the joint of the branch cable and the main cable is directly subjected to large pulling force and is damaged or even broken is avoided, the pulling resistance of the prefabricated branch cable is ensured, and the service life of the prefabricated branch cable is prolonged. Therefore, the safety and the reliability of the prefabricated branch cable are effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of cables, in particular to a prefabricated branch cable. Background Art

[0002] Prefabricated branch cables are cables with branches that are manufactured on an assembly line using a series of special production equipment in the factory in accordance with the main and branch cable models, specifications, cross-sections, lengths, branch positions and other indicators required by cable users.

[0003] Prefabricated branch cables can avoid on-site connection operations of main and branch cables, effectively improving the efficiency of cable laying and installation. At the same time, compared with the manual connection operations of main and branch cables on-site, prefabricated branch cables have better earthquake resistance, air tightness and waterproofness.

[0004] Since the existing prefabricated branch cable has a Y-shaped bifurcated structure, in order to improve the connection strength of the connection, a protective layer is wrapped around the connection to resist the influence of external mechanical forces. However, the protection effect obtained by relying solely on the protective layer is limited, especially when the main cable or the branch cable is pulled by external force, the connection between the main cable and the branch cable is prone to breakage and damage. To this end, we propose a prefabricated branch cable. Summary of the invention

[0005] The object of the present invention is to provide a prefabricated branch cable to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a prefabricated branch cable, comprising: an inlet pipe and a protective shell; further comprising: a main cable is fixedly inserted in the inlet pipe, the bottom end of the main cable passes through the bottom end of the inlet pipe, a branch cable is connected to the side of the main cable, a protective member is wrapped at the connection between the branch cable and the main cable, an installation cavity is opened in the protective shell, the protective member is fixedly connected in the installation cavity, the top end of the inlet pipe passes through the top wall of the protective shell, the bottom ends of the main cable and the branch cable both pass through the bottom wall of the protective shell, a first buffer component is provided in the installation cavity, and the first buffer component is used to reduce the tension applied to the branch cable when it is pulled; The first buffer assembly includes two circular plates elastically slidably connected between the front and rear inner walls of the installation cavity, an arc-shaped plate is fixedly connected between the two circular plates, an arc groove is opened on the arc surface of the arc-shaped plate, and the branch cable bypasses the arc groove and runs in an arc shape.

[0007] Preferably, the first buffer assembly also includes two pairs of guide rods symmetrically fixedly connected to the left inner wall of the installation cavity, the right ends of the two pairs of guide rods are symmetrically fixedly connected with two pairs of limit plates, two movable plates are symmetrically movably sleeved between the outer circumferential surfaces of the two pairs of guide rods, the side surfaces of the two circular plates that are far away from each other are respectively fixedly connected to the side surfaces of the two movable plates that are close to each other, and two pairs of first elastic members are symmetrically fixedly connected between the left sides of the two movable plates and the left inner wall of the installation cavity. The advantage of such an arrangement is that when the branch cable is pulled by external force, the arc-shaped plate will be pushed to overcome the elastic force of the first elastic member and cooperate with the guide rod to push the movable plate to the left, so that the connection between the branch cable and the main cable can be prevented from being subjected to large instantaneous tension, the connection between the branch cable and the main cable is protected from breakage and damage, and the tensile resistance and reliability of the prefabricated branch cable are improved.

[0008] Preferably, the protective shell is provided with a second buffer component, and the second buffer component is used to cooperate with the first buffer component to reduce the tension applied to the branch cable when it is pulled.

[0009] Preferably, the second buffer assembly includes an outlet tube fixedly connected to the bottom of the protective shell, and a plurality of elastic retaining rings are fixedly connected to the inner wall of the outlet tube at equal distances from top to bottom, and a movable ring is slidably connected between the inner walls of the outlet tube, and the bottom end of the branch cable passes through the bottom of the protective shell and extends into the outlet tube, and the branch cable is inserted in the inner ring of the movable ring, and the bottom end of the branch cable passes through the inner ring of the movable ring and the bottom end of the outlet tube. The advantage of such an arrangement is that when the branch cable is subjected to external pulling force, the movable ring will move downward along the axial direction of the outlet tube as the branch cable moves until the movable ring collides with the retaining ring, and since the retaining ring is elastic, the movable ring will pass through the inner ring of the retaining ring and be decelerated when pulled by the branch cable, thereby further reducing the magnitude of the direct pulling force at the connection between the branch cable and the main cable, and preventing the connection between the branch cable and the main cable from breaking.

[0010] Preferably, the second buffer assembly also includes a conduit connected to the bottom of the movable ring, the inner hole of the conduit is coaxially connected to the inner ring of the movable ring, the bottom end of the branch cable is movably inserted into the inner ring of the movable ring and the inner hole of the conduit, the diameter of the inner ring of the movable ring and the inner hole of the conduit are both larger than 1.5 times the diameter of the branch cable, the second buffer assembly also includes a push ring fixedly sleeved on the outer peripheral surface of the branch cable, the push ring is located on the upper side of the movable ring, the advantage of such a setting is that when the branch cable is pulled by an external pulling force and moves a distance, the push ring will collide with the movable ring and push the movable ring to squeeze through the inner ring of the retaining ring, so that the first The buffer assembly and the second buffer assembly successively and tightly connect the branch cables to ensure effective and reliable buffer protection for the branch cables, further improving the safety and reliability of the prefabricated branch cables. At the same time, as the pulling force on the branch cables increases, more retaining rings are squeezed and penetrated by the movable ring, and the length of the outlet pipe extending from the bottom of the conduit becomes longer. This makes it easier for staff to promptly discover prefabricated branch cables that are subjected to excessive force, so as to take timely countermeasures to reduce the force on the branch cables in the prefabricated branch cables, further ensuring the reliability and safety of the prefabricated branch cables.

[0011] Preferably, a third buffer component is further provided in the protective shell, and the third buffer component is used to further reduce the tension applied to the branch cable when it is pulled.

[0012] Preferably, the third buffer assembly includes a fixed block fixedly connected between the adjacent side surfaces of the two circular plates, the right side surface of the fixed block is symmetrically provided with two limit grooves, the inner top wall and the inner bottom wall of the two limit grooves are symmetrically provided with two groups of card slots, and each group of multiple card slots is equidistantly distributed from left to right. The third buffer assembly also includes two limit rods symmetrically fixedly connected to the left side surface of the arc-shaped plate, two rectangular cavities symmetrically provided in the two limit rods, a connecting block is fixedly connected between the front inner wall and the rear inner wall of the rectangular cavity, two pairs of insertion rods are symmetrically and movably inserted at the top and bottom of the connecting block, two pairs of card plates are symmetrically fixedly connected at the ends of the two pairs of insertion rods that are away from each other, the two pairs of card plates respectively penetrate the front inner wall and the rear inner wall of the limit rod and can be inserted into the two groups of card slots, and the adjacent sides of the two pairs of card plates are symmetrically fixedly connected to the top and bottom of the connecting block. There are two pairs of second elastic members, and two pairs of third elastic members are symmetrically fixedly connected between the left side of the arc-shaped plate and the right side of the fixed block. The advantage of such an arrangement is that when the branch cable is subjected to external pulling force, the arc-shaped plate is subjected to pressure, and when the branch cable is instantaneously subjected to a large pulling force, the arc-shaped plate is also instantaneously subjected to a large pressure. At this time, the card plate and the card slot are squeezed and retracted into the rectangular cavity, and then when the limit rod continues to penetrate the left side of the limit slot to the left, the card plate will pop out of the rectangular cavity again under the elastic force of the second elastic member and be inserted into the card slot. In this way, the arc-shaped plate can intermittently and quickly move to the left, so that when the branch cable is subjected to a large smooth pulling force, the branch cable can quickly extend one end of the length from the installation cavity, thereby effectively avoiding damage to the branch cable due to a large instantaneous pulling force, further improving the safety and reliability of the prefabricated branch cable.

[0013] Preferably, the cross-section of the sides of the two pairs of card plates that are away from each other is arc-shaped, and the length of the card plates is less than two-thirds of the depth of the slot. The advantage of this arrangement is that the card plates can be smoothly retracted into the rectangular cavity when a large extrusion pressure is generated between the card plates and the side walls of the slot, ensuring that the third buffer assembly can smoothly and stably perform buffering protection on the branch cable.

[0014] Preferably, a rotating shaft is rotatably connected between the adjacent sides of the two circular plates, the axis center line of the rotating shaft coincides with the axis center line of the two circular plates, the fixed block is fixedly sleeved on the outer circumferential surface of the rotating shaft, and two first torsion springs are symmetrically fixedly connected between the front and back sides of the fixed block and the adjacent sides of the two circular plates. The advantage of such a setting is that when the arc-shaped plate is subjected to the pressure brought by the branch cable, the arc-shaped plate can not only slide to the right side but also rotate on its own, thereby effectively reducing the friction between the branch cable and the inner wall of the arc groove, and more effectively protecting the safety of the branch cable.

[0015] Preferably, the central angle corresponding to the arc surface of the arc-shaped plate is not less than ninety degrees. The advantage of such a setting is that the force distribution between the inner wall of the arc groove and the branch cable can be more uniform, thereby avoiding damage to the branch cable due to excessive local force.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention uses a protective shell, an installation cavity and a first buffer component to enable the arc-shaped plate to elastically slide when the branch cable is subjected to an external pulling force, thereby preventing the connection between the branch cable and the main cable from being directly subjected to a large pulling force and being damaged or even broken, thereby ensuring the anti-pulling performance of the prefabricated branch cable, thereby effectively improving the safety and reliability of the prefabricated branch cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the first structure of the present invention; Figure 2 It is a schematic diagram of the second structure of the present invention; Figure 3 It is a schematic diagram of the first cross-sectional structure of the present invention; Figure 4 It is a second cross-sectional structural schematic diagram of the present invention; Figure 5 is a first cross-sectional structural schematic diagram of the third buffer assembly in the present invention; Figure 6 is a second cross-sectional structural schematic diagram of the third buffer assembly in the present invention; Figure 7 for Figure 3 Enlarged view of point A in the middle; Figure 8 for Figure 4 Enlarged view of point B in the middle; Fig. 9 for Figure 5 Enlarged view of point C in the middle; Fig.10 for Figure 6 Enlarged view of point D in the middle.

[0018] In the figure: 1. inlet pipe; 11. main cable; 12. branch cable; 13. protective part; 2. protective shell; 21. installation cavity; 3. first buffer assembly; 31. guide rod; 32. limit plate; 33. movable plate; 34. first elastic part; 35. round plate; 36. arc plate; 361. arc groove; 4. second buffer assembly; 41. outlet pipe; 42. retaining ring; 43. movable ring; 44. guide tube; 45. push ring; 5. third buffer assembly; 51. fixed block; 52. limit groove; 53. clamping groove; 54. limit rod; 55. connecting block; 56. plug rod; 57. clamping plate; 58. third elastic part; 59. rotating shaft; 510. first torsion spring. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figure 1-Figure 10 , a prefabricated branch cable shown in the figure includes: an inlet pipe 1 and a protective shell 2; further comprising: a main cable 11 is fixedly inserted in the inlet pipe 1, the bottom end of the main cable 11 passes through the bottom end of the inlet pipe 1, a branch cable 12 is connected to the side of the main cable 11, and a protective member 13 is wrapped at the connection between the branch cable 12 and the main cable 11. The protective member 13 is made of rubber. An installation cavity 21 is opened in the protective shell 2, and the protective member 13 is fixedly connected in the installation cavity 21. The top of the inlet pipe 1 passes through the top wall of the protective shell 2, and the bottom ends of the main cable 11 and the branch cable 12 both pass through the bottom wall of the protective shell 2. A first buffer component 3 is provided in the installation cavity 21, and the first buffer component 3 is used to reduce the tension applied to the branch cable 12 when it is pulled; The first buffer assembly 3 includes two circular plates 35 elastically slidably connected between the front and rear inner walls of the installation cavity 21, and an arc plate 36 is fixedly connected between the two circular plates 35. An arc groove 361 is opened on the arc surface of the arc plate 36, and the branch cable 12 bypasses the arc groove 361 and runs in an arc shape.

[0021] See also Figure 3 , Figure 4 and Figure 7 The first buffer assembly 3 also includes two pairs of guide rods 31 symmetrically fixedly connected to the left inner wall of the installation cavity 21, two pairs of limit plates 32 are symmetrically fixedly connected to the right ends of the two pairs of guide rods 31, two movable plates 33 are symmetrically and movably sleeved between the outer circumferential surfaces of the two pairs of guide rods 31, and the side surfaces of the two circular plates 35 that are away from each other are respectively fixedly connected to the side surfaces of the two movable plates 33 that are close to each other, and two pairs of first elastic members 34 are symmetrically and fixedly connected between the left sides of the two movable plates 33 and the left inner wall of the installation cavity 21.

[0022] Specifically, when the branch cable 12 is pulled by an external force, the arc-shaped plate 36 will be pushed to overcome the elastic force of the first elastic member 34 and cooperate with the guide rod 31 to push the movable plate 33 to move to the left. This can prevent the connection between the branch cable 12 and the main cable 11 from being subjected to a large instantaneous pulling force, protect the connection between the branch cable 12 and the main cable 11 from being broken or damaged, and improve the anti-tensioning performance and reliability of the prefabricated branch cable.

[0023] See also Figure 2 , Figure 3 , Figure 4 and Figure 8 A second buffer component 4 is provided on the protective shell 2, and the second buffer component 4 is used to cooperate with the first buffer component 3 to reduce the tension applied to the branch cable 12 when it is pulled.

[0024] See also Figure 4 and Figure 8 The second buffer assembly 4 includes an outlet tube 41 fixedly connected to the bottom of the protective shell 2, and a plurality of elastic retaining rings 42 are fixedly connected to the inner wall of the outlet tube 41 at equal intervals from top to bottom. A movable ring 43 is slidably connected between the inner walls of the outlet tube 41. The bottom end of the branch cable 12 passes through the bottom of the protective shell 2 and extends into the outlet tube 41. The branch cable 12 is inserted into the inner circle of the movable ring 43, and the bottom end of the branch cable 12 passes through the inner circle of the movable ring 43 and the bottom end of the outlet tube 41.

[0025] Specifically, when the branch cable 12 is subjected to external pulling force, the movable ring 43 will move downward along the axial direction of the outlet pipe 41 as the branch cable 12 moves until the movable ring 43 collides with the retaining ring 42. Since the retaining ring 42 is elastic, the movable ring 43 will penetrate the inner circle of the retaining ring 42 and be decelerated under the pulling of the branch cable 12, thereby further reducing the magnitude of the direct pulling force at the connection between the branch cable 12 and the main cable 11, and preventing the connection between the branch cable 12 and the main cable 11 from breaking.

[0026] participate Figure 8 The second buffer component 4 also includes a conduit 44 connected to the bottom of the movable ring 43, the inner hole of the conduit 44 is coaxially connected to the inner circle of the movable ring 43, the bottom end of the branch cable 12 is movably inserted into the inner circle of the movable ring 43 and the inner hole of the conduit 44, the diameter between the inner circle of the movable ring 43 and the inner hole of the conduit 44 are both larger than 1.5 times the diameter of the branch cable 12, the second buffer component 4 also includes a push ring 45 fixedly sleeved on the outer peripheral surface of the branch cable 12, and the push ring 45 is located on the upper side of the movable ring 43.

[0027] Specifically, when the branch cable 12 is moved a certain distance by the external pulling force, the push ring 45 will collide with the movable ring 43 and push the movable ring 43 to squeeze through the inner circle of the retaining ring 42, so that the first buffer component 3 and the second buffer component 4 can successively perform buffering protection on the branch cable 12 and be tightly connected one after another, ensuring that the branch cable 12 is effectively and reliably buffered and protected, further improving the safety and reliability of the prefabricated branch cable, and at the same time, as the pulling force on the branch cable 12 increases, the number of retaining rings 42 squeezed and penetrated by the movable ring 43 increases, and the length of the bottom end of the conduit 44 extending out of the outlet pipe 41 becomes greater, so that the staff can promptly find the prefabricated branch cable that is subjected to excessive force, so as to take timely countermeasures to reduce the force on the branch cable 12 in the prefabricated branch cable, further ensuring the reliability and safety of the prefabricated branch cable.

[0028] See also Figure 3 , Figure 4 , Figure 5 , Figure 6 , Fig. 9 and Fig.10 A third buffer component 5 is also provided in the protective shell 2, and the third buffer component 5 is used to further reduce the tension applied to the branch cable 12 when it is pulled.

[0029] refer to Figure 5 , Figure 6 , Fig. 9 and Fig.10 The third buffer assembly 5 includes a fixed block 51 fixedly connected between the adjacent sides of the two circular plates 35, and two limit grooves 52 are symmetrically provided on the right side of the fixed block 51. Two groups of card slots 53 are symmetrically provided on the inner top wall and the inner bottom wall of the two limit grooves 52, and each group of multiple card slots 53 are equidistantly distributed from left to right. The third buffer assembly 5 also includes two limit rods 54 symmetrically fixedly connected to the left side of the arc-shaped plate 36, and two rectangular cavities are symmetrically provided in the two limit rods 54, and the front inner wall and the rear inner wall of the rectangular cavity are between them. A connecting block 55 is fixedly connected, and two pairs of insertion rods 56 are symmetrically and movably inserted at the top and bottom of the connecting block 55. Two pairs of clamping plates 57 are symmetrically and fixedly connected on the ends of the two pairs of insertion rods 56 that are away from each other. The two pairs of clamping plates 57 respectively penetrate the front inner wall and the rear inner wall of the limiting rod 54 and can be inserted into the two groups of clamping grooves 53. Two pairs of second elastic members are symmetrically and fixedly connected between the adjacent sides of the two pairs of clamping plates 57 and the top and bottom of the connecting block 55. Two pairs of third elastic members 58 are symmetrically and fixedly connected between the left side of the arc-shaped plate 36 and the right side of the fixed block 51.

[0030] Specifically, when the branch cable 12 is subjected to external pulling force, the arc-shaped plate 36 is subjected to pressure. When the branch cable 12 is subjected to a large pulling force instantaneously, the arc-shaped plate 36 is also subjected to a large pressure instantaneously. At this time, the card plate 57 is squeezed with the card slot 53 and retracted into the rectangular cavity. Then, when the limit rod 54 continues to go deep into the left side of the limit slot 52 to the left, the card plate 57 will pop out from the rectangular cavity again under the elastic force of the second elastic member and be inserted into the card slot 53. In this way, the arc-shaped plate 36 can move intermittently and quickly to the left, so that when the branch cable 12 is subjected to a large smooth pulling force, the branch cable 12 can quickly extend one end of the length from the installation cavity 21, thereby effectively avoiding damage to the branch cable 12 due to a large instantaneous pulling force, thereby further improving the safety and reliability of the prefabricated branch cable.

[0031] refer to Fig.10 The cross-section of the side surfaces of the two pairs of clamping plates 57 that are away from each other is in an arc shape, and the length of the clamping plates 57 is less than two-thirds of the depth of the clamping groove 53.

[0032] Specifically, when a large squeezing force is generated between the clamping plate 57 and the side wall of the clamping slot 53 , the clamping plate 57 can be smoothly retracted into the rectangular cavity, ensuring that the third buffer assembly 5 can smoothly and stably provide buffer protection for the branch cable 12 .

[0033] refer to Figure 7 A rotating shaft 59 is rotatably connected between the adjacent sides of the two circular plates 35, and the axis line of the rotating shaft 59 coincides with the axis line of the two circular plates 35. The fixed block 51 is fixedly sleeved on the outer circumferential surface of the rotating shaft 59, and two first torsion springs 510 are symmetrically fixedly connected between the front and back sides of the fixed block 51 and the adjacent sides of the two circular plates 35.

[0034] Specifically, when the arc-shaped plate 36 is subjected to the pressure brought by the branch cable 12, the arc-shaped plate 36 can not only slide to the right, but also rotate, thereby effectively reducing the friction between the branch cable 12 and the inner wall of the arc groove 361, and more effectively protecting the safety of the branch cable 12.

[0035] refer to Figure 7 The central angle corresponding to the arc surface of the arc-shaped plate 36 is not less than ninety degrees.

[0036] Specifically, the force distribution between the inner wall of the arc groove 361 and the branch cable 12 can be made more uniform, thereby preventing the branch cable 12 from being damaged due to excessive force on a part of the branch cable 12 .

[0037] Working principle: During use, when the branch cable 12 is subjected to external pulling force, the arc-shaped plate 36 will be pushed to overcome the elastic force of the first elastic member 34 and cooperate with the guide rod 31 to push the movable plate 33 to move to the left. In this way, the connection between the branch cable 12 and the main cable 11 can be prevented from being subjected to a large instantaneous pulling force, thereby protecting the connection between the branch cable 12 and the main cable 11 from breakage and damage, thereby improving the anti-pulling performance and reliability of the prefabricated branch cable.

[0038] When the arc-shaped plate 36 slides to the leftmost side, the push ring 45 collides with the movable ring 43 and pushes the movable ring 43 to squeeze through the inner circle of the retaining ring 42, so that the first buffer component 3 and the second buffer component 4 can successively perform buffering protection on the branch cable 12 and are tightly connected in succession, ensuring that the branch cable 12 is effectively and reliably buffered and protected, further improving the safety and reliability of the prefabricated branch cable. At the same time, as the pulling force on the branch cable 12 increases, the number of retaining rings 42 squeezed and penetrated by the movable ring 43 increases, and the length of the bottom end of the conduit 44 extending out of the outlet pipe 41 becomes greater, so that the staff can promptly find the prefabricated branch cable that is subjected to excessive force, so as to take timely countermeasures to reduce the force on the branch cable 12 in the prefabricated branch cable, further ensuring the reliability and safety of the prefabricated branch cable.

[0039] And when the branch cable 12 is instantaneously subjected to a large pulling force, the arc-shaped plate 36 is also instantaneously subjected to a large pressure. At this time, the card plate 57 is squeezed with the card slot 53 and retracted into the rectangular cavity. Then, when the limit rod 54 continues to go deep into the left side of the limit slot 52 to the left, the card plate 57 will pop out from the rectangular cavity again under the elastic force of the second elastic member and be inserted into the card slot 53. In this way, the arc-shaped plate 36 can intermittently and quickly move to the left, so that when the branch cable 12 is subjected to a large smooth pulling force, the branch cable 12 can quickly extend one end of the length from the installation cavity 21, thereby effectively avoiding damage to the branch cable 12 due to a large instantaneous pulling force, further improving the safety and reliability of the prefabricated branch cable.

[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

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

Claims

1. A prefabricated branch cable, comprising: An inlet pipe (1) and a protective shell (2); characterized in that it also includes: a main cable (11) is fixedly inserted in the inlet pipe (1), the bottom end of the main cable (11) passes through the bottom end of the inlet pipe (1), a branch cable (12) is connected to the side of the main cable (11), and a protective member (13) is wrapped at the connection between the branch cable (12) and the main cable (11), an installation cavity (21) is opened in the protective shell (2), and the protective member (13) is fixedly connected in the installation cavity (21), the top end of the inlet pipe (1) passes through the top wall of the protective shell (2), the bottom ends of the main cable (11) and the branch cable (12) both pass through the bottom wall of the protective shell (2), and a first buffer component (3) is provided in the installation cavity (21), and the first buffer component (3) is used to reduce the tension applied to the branch cable (12) when it is pulled; The first buffer assembly (3) comprises two circular plates (35) elastically slidably connected between front and rear inner walls in the installation cavity (21); an arc-shaped plate (36) is fixedly connected between the two circular plates (35); an arc groove (361) is provided on the arc surface of the arc-shaped plate (36); and the branch cable (12) bypasses the arc groove (361) and runs in an arc shape.

2. A prefabricated branch cable according to claim 1, characterized in that: The first buffer assembly (3) further comprises two pairs of guide rods (31) symmetrically fixedly connected to the left inner wall of the installation cavity (21); two pairs of limit plates (32) are symmetrically fixedly connected to the right ends of the two pairs of guide rods (31); two movable plates (33) are symmetrically and movably sleeved between the outer peripheral surfaces of the two pairs of guide rods (31); the side surfaces of the two circular plates (35) that are separated from each other are respectively fixedly connected to the side surfaces of the two movable plates (33) that are close to each other; and two pairs of first elastic members (34) are symmetrically and fixedly connected between the left side surfaces of the two movable plates (33) and the left inner wall of the installation cavity (21).

3. A prefabricated branch cable according to claim 2, characterized in that: The protective shell (2) is provided with a second buffer component (4), and the second buffer component (4) is used to cooperate with the first buffer component (3) to reduce the tension applied to the branch cable (12) when it is pulled.

4. A prefabricated branch cable according to claim 3, characterized in that: The second buffer assembly (4) comprises an outlet pipe (41) fixedly connected to the bottom of the protective shell (2); a plurality of elastic retaining rings (42) are fixedly connected to the inner wall of the outlet pipe (41) at equal intervals from top to bottom; a movable ring (43) is slidably connected between the inner walls of the outlet pipe (41); the bottom end of the branch cable (12) passes through the bottom of the protective shell (2) and extends into the outlet pipe (41); the branch cable (12) is plugged into the inner ring of the movable ring (43); and the bottom end of the branch cable (12) passes through the inner ring of the movable ring (43) and the bottom end of the outlet pipe (41).

5. A prefabricated branch cable according to claim 4, characterized in that: The second buffer assembly (4) further comprises a conduit (44) connected to the bottom of the movable ring (43); the inner hole of the conduit (44) and the inner circle of the movable ring (43) are coaxially connected; the bottom end of the branch cable (12) is movably inserted into the inner circle of the movable ring (43) and the inner hole of the conduit (44); the diameter of the inner circle of the movable ring (43) and the inner hole of the conduit (44) are both larger than 1.5 times the diameter of the branch cable (12); the second buffer assembly (4) further comprises a push ring (45) fixedly sleeved on the outer peripheral surface of the branch cable (12); the push ring (45) is located on the upper side of the movable ring (43).

6. A prefabricated branch cable according to claim 5, characterized in that: A third buffer component (5) is also provided in the protective shell (2), and the third buffer component (5) is used to further reduce the pulling force applied to the branch cable (12) when it is pulled.

7. A prefabricated branch cable according to claim 6, characterized in that: The third buffer assembly (5) comprises a fixed block (51) fixedly connected between adjacent side surfaces of the two circular plates (35), the right side surface of the fixed block (51) symmetrically opening two limit grooves (52), the inner top wall and the inner bottom wall of the two limit grooves (52) symmetrically opening two groups of clamping grooves (53), each group of multiple clamping grooves (53) are equidistantly distributed from left to right, the third buffer assembly (5) also comprises two limit rods (54) symmetrically fixedly connected to the left side surface of the arc-shaped plate (36), the two limit rods (54) symmetrically opening two rectangular cavities, the front inner wall and the rear inner wall of the rectangular cavity are fixedly connected to each other. A connecting block (55) is fixedly connected, and two pairs of insertion rods (56) are symmetrically and movably inserted at the top and bottom of the connecting block (55), and two pairs of clamping plates (57) are symmetrically and fixedly connected at the ends of the two pairs of insertion rods (56) that are far away from each other, and the two pairs of clamping plates (57) respectively penetrate the front inner wall and the rear inner wall of the limiting rod (54) and can be inserted into the two groups of clamping grooves (53), and two pairs of second elastic members are symmetrically and fixedly connected between the adjacent sides of the two pairs of clamping plates (57) and the top and bottom of the connecting block (55), and two pairs of third elastic members (58) are symmetrically and fixedly connected between the left side of the arc-shaped plate (36) and the right side of the fixed block (51).

8. The prefabricated branch cable according to claim 7, characterized in that: The cross-sections of the sides of the two pairs of clamping plates (57) that are separated from each other are arc-shaped, and the length of the clamping plates (57) is less than two-thirds of the depth of the clamping slot (53).

9. A prefabricated branch cable according to claim 8, characterized in that: A rotating shaft (59) is rotatably connected between the adjacent side surfaces of the two circular plates (35), the axis center line of the rotating shaft (59) coincides with the axis center lines of the two circular plates (35), the fixed block (51) is fixedly sleeved on the outer peripheral surface of the rotating shaft (59), and two first torsion springs (510) are symmetrically fixedly connected between the front and back surfaces of the fixed block (51) and the adjacent side surfaces of the two circular plates (35).

10. A prefabricated branch cable according to claim 9, characterized in that: The central angle corresponding to the arc surface of the arc-shaped plate (36) is not less than ninety degrees.

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