Cable connection device

Abstract

The present invention belongs to the technical field of cable connection, and specifically is a cable connection device, comprising a main body shell and a fastening mechanism; when the cables are connected, the two main body shells are sleeved on the outside of the cables, and the connecting parts of the two main body shells are rotatably connected; the main body shell comprises a fixed cylinder and a movable cylinder, and one axial end of the movable cylinder is rotatably connected to the axial end of the fixed cylinder; the fastening mechanism comprises an elastic arc plate and a closed cover, the elastic arc plate is fixedly installed on the end of the fixed cylinder away from the movable cylinder, the closed cover is sleeved on the outside of the cable, and is connected to the elastic arc plate through internal and external thread cooperation; the inner wall of the movable cylinder is fixedly installed with a top pressure strip for pressing the conductor, and the top pressure strip is inclined; the inner wall of the elastic arc plate is fixedly installed with a limiting cone, and the limiting cone is inclined, and a plurality of limiting cones are provided; the connection of the two cables is achieved through the above-mentioned structural cooperation, and at the same time, the stability of the cable connection is improved to prevent the connection from breaking.

Description

Technical Field

[0001] The invention belongs to the technical field of cable connection, in particular to a cable connection device. Background Art

[0002] Cable is a conductive wire bundle consisting of one or more insulated cable cores and an outer protective layer. It usually consists of a conductor, an insulation layer, a filler between the insulation layers, a sheath, and other accessory parts. Cables are used to transmit electrical energy, signals, and data to various devices and systems. The conductor is the part of the cable used to transmit current, usually made of conductive materials such as copper or aluminum. The conductor can be in the shape of a single wire or a multi-strand wire twisted together. The insulation layer is an insulating material located outside the conductor, which is used to isolate the current between the conductor and the external environment.

[0003] Cable connection occupies a pivotal position in modern electrical engineering. It refers to the precise joining of two or more cables to achieve electrical connection or stable signal transmission. Cable connection is not only related to the normal operation of the electrical system, but also directly affects the efficiency and stability of signal transmission. Cable connection, as an important part of electrical engineering, plays a vital role in electrical systems and signal transmission.

[0004] When the cable is pulled by external force, the problem of insufficient strength of the cable connection will be exposed. Due to the lack of sufficient support and fixation at the connection, the connection between the two cables is very easy to disconnect at the cable connection device. This situation will not only affect the normal transmission of electricity, but may also cause serious safety accidents.

[0005] To this end, the present invention provides a cable connecting device. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is as follows: a cable connecting device described in the present invention comprises a main body shell and a fastening mechanism.

[0008] When the cables are connected, the two main body shells are sleeved on the outside of the cables, and the connecting parts of the two main body shells are connected by rotation.

[0009] The main body shell comprises a fixed cylinder and a movable cylinder, and one axial end of the movable cylinder is rotatably connected to the axial end of the fixed cylinder.

[0010] The fastening mechanism comprises an elastic arc plate and a closing cover. The elastic arc plate is fixedly mounted on one end of the fixed cylinder away from the movable cylinder. The closing cover is sleeved on the outside of the cable and connected to the elastic arc plate through internal and external thread cooperation.

[0011] A pressing strip for pressing the conductor is fixedly installed on the inner wall of the movable cylinder, and the pressing strip is arranged obliquely.

[0012] Preferably, a limiting cone is fixedly installed on the inner wall of the elastic arc plate, the limiting cone is arranged obliquely, and a plurality of limiting cones are provided, and the plurality of limiting cones are evenly distributed in a ring shape along the axis of the elastic arc plate.

[0013] A sealing ring is fixedly installed on the inner wall of the elastic arc plate, and the sealing ring is made of elastic material.

[0014] An observation strip is fixedly installed on the inner wall of the movable cylinder.

[0015] Preferably, a plurality of top pressure strips are evenly arranged in an annular shape along the inner wall of the movable cylinder, a closing strip is fixedly installed on the radial inner wall of the movable cylinder, and the other end of the closing strip is fixedly connected to the outer wall of the top pressure strip.

[0016] Preferably, an elastic strip is fixedly installed on the axial end of the movable cylinder, and the elastic strip is arranged obliquely, and a limiting inclined block is fixedly installed on one end of the fixed cylinder close to the movable cylinder, and the tip of the elastic strip fits with the inclined surface of the limiting inclined block.

[0017] Preferably, an injection tube is fixedly installed on the outer wall of the movable cylinder, the inner cavity of the injection tube is connected with the inner cavity of the movable cylinder, a blocking plate is fixedly installed on the inner cavity of the injection tube, a truncated cone-shaped through hole is opened on the inner wall of the blocking plate, and the inner cavity of the injection tube is provided with a sealing plug for sealing the blocking plate.

[0018] Preferably, a hollow bracket is fixedly installed on the inner wall of the injection tube, a guide rod is slidably installed on the inner wall of the hollow bracket, one end of the guide rod is fixedly connected to the bottom center position of the sealing plug, and the bottom surface of the sealing plug is elastically connected to the upper end surface of the hollow bracket.

[0019] Preferably, a heat conducting plate is fixedly mounted on the inner wall of the fixed tube, one end of the heat conducting plate extends to the outer wall of the fixed tube, and the heat conducting plate is made of insulating material.

[0020] A plurality of heat conducting plates are arranged, and a plurality of heat conducting plates are evenly arranged along the outer wall of the fixing tube.

[0021] Preferably, a drainage hole for drainage is opened at the bottom of the fixed cylinder, and a closing plug for blocking the drainage hole is arranged in the fixed cylinder. The upper end of the closing plug is a conical structure, and the shape of the drainage hole is adapted to the closing plug.

[0022] The inner cavity of the movable cylinder is provided with a tightening line, one end of the tightening line is fixedly connected to the outer wall of the top pressure strip, and the other end of the tightening line is fixedly connected to the outer wall of the closing plug.

[0023] Preferably, the inner wall of the movable cylinder is provided with an adhesive film, and the tightening line is fixed to the inner wall of the movable cylinder through the adhesive film.

[0024] The beneficial effects of the present invention are as follows:

[0025] 1. The present invention provides an elastic arc plate and a closing cover. Before installation, the fixed cylinder and the movable cylinder need to be sleeved on the outside of one of the cables, and then the conductor cores scattered at both ends are staggered and plugged together, and the positions of the fixed cylinder and the movable cylinder are slid and adjusted until the connection part of the cable is located between the two movable cylinders. At this time, the closing cover is rotated to make the closing cover feed along the axis direction of the elastic arc plate, thereby squeezing the elastic arc plate until the elastic arc plate is tightly fitted with the insulating layer of the outer wall of the cable, and the top pressure strip extends into the scattered conductor core. At this time, the movable cylinder is rotated to drive the top pressure strip to move the scattered conductor core until the two strands are staggered and tightened, thereby realizing the connection of the two cables, and at the same time improving the stability of the cable connection, preventing the connection from breaking, and reducing the risk;

[0026] 2. The present invention sets a tightening wire, one end of which is fixedly connected to the outer wall of the top pressure strip, and the other end of which is fixedly connected to the outer wall of the closing plug. The movable cylinder drives the top pressure strip to rotate, and then pulls the tightening wire. One end of the tightening wire rotates along the axis of the movable cylinder. As one end of the tightening wire rotates, the tightening wire is gradually tightened, thereby tightening the loose conductor core inside and improving the stability of the connection. In addition, as the tightening wire is tightened, the closing plug and the drainage through hole are pulled to fit tightly, thereby achieving the closure of the fixed cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the internal structure of the movable cylinder in the present invention;

[0030] Figure 3 It is a schematic diagram of the structure of the elastic arc plate in the present invention;

[0031] Figure 4 It is a schematic diagram of the installation of the limiting inclined block in the present invention;

[0032] Figure 5 It is a schematic diagram of the installation of the closing strip in the present invention;

[0033] Figure 6 It is a schematic diagram of the installation of the heat conducting plate in the present invention;

[0034] Figure 7 It is a schematic diagram of the structure of the tightening line in the present invention;

[0035] Figure 8 It is a schematic diagram of the internal structure of the liquid injection tube in the present invention;

[0036] Fig. 9It is a schematic diagram of the structure of the adhesive film in the present invention.

[0037] In the figure: 1. Closing cover; 2. Fixed cylinder; 3. Observation strip; 4. Movable cylinder; 5. Top pressure strip; 6. Sealing ring; 7. Elastic arc plate; 8. Limiting cone; 9. Limiting inclined block; 10. Elastic strip; 11. Closing strip; 12. Tightening line; 13. Heat conduction plate; 14. Liquid injection tube; 15. Closing plug; 16. Blocking plate; 17. Guide rod; 18. Hollow bracket; 19. Sealing plug; 20. Adhesive film. DETAILED DESCRIPTION

[0038] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0039] Embodiment 1: Figures 1 to 5 As shown, a cable connection device according to an embodiment of the present invention includes a main body shell and a fastening mechanism.

[0040] When the cables are connected, the two main shells are sleeved on the outside of the cables, and the connecting parts of the two main shells are rotated and connected. When the two cables are connected, the main shells are sleeved on the outer walls of the cables to provide protection for the cable connection points.

[0041] Before connecting the cables, firstly, the outer insulation layer of the cables is stripped off to expose the inner conductor core, and at the same time, the conductor cores at both ends are spread out and then staggered and plugged together.

[0042] The main shell includes a fixed cylinder 2 and a movable cylinder 4, wherein one axial end of the movable cylinder 4 is rotationally connected to the axial end of the fixed cylinder 2, wherein a sealing bearing is provided at the connection portion between the fixed cylinder 2 and the movable cylinder 4, so as to achieve a sealing effect while realizing the rotational connection between the fixed cylinder 2 and the movable cylinder 4.

[0043] In addition, if Figure 1 As shown, two fixed cylinders 2 and two movable cylinders 4 are symmetrically arranged, the two movable cylinders 4 are adjacent to each other, and a sealed bearing is arranged at the connecting part.

[0044] The fastening mechanism comprises an elastic arc plate 7 and a closing cover 1 . The elastic arc plate 7 is fixedly mounted on one end of the fixed cylinder 2 away from the movable cylinder 4 . A plurality of elastic arc plates 7 are arranged in a ring shape along the axis of the fixed cylinder 2 .

[0045] The closing cover 1 is sleeved on the outside of the cable and is connected to the elastic arc plate 7 by means of internal and external threads. Before installation, the closing cover 1, the elastic arc plate 7, the fixed cylinder 2 and the movable cylinder 4 need to be sleeved on the outside of one of the cables, and then the conductor cores scattered at both ends are staggered and plugged together, and the positions of the fixed cylinder 2 and the movable cylinder 4 are slid and adjusted until the connection part of the cable is located between the two movable cylinders 4. At this time, the closing cover 1 is rotated so that the closing cover 1 is fed along the axial direction of the elastic arc plate 7, thereby squeezing the elastic arc plate 7 until the elastic arc plate 7 is tightly fitted with the insulating layer of the outer wall of the cable, and the connection between the fixed cylinder 2 and the cable is achieved by friction, thereby protecting the cable connection part in the inner cavity.

[0046] A top pressure strip 5 for pressing the conductor is fixedly installed on the inner wall of the movable cylinder 4. The top pressure strip 5 is arranged obliquely, wherein the other end of the top pressure strip 5 is raised, and the top pressure strip 5 extends into the scattered conductor core. At this time, rotating the movable cylinder 4 drives the top pressure strip 5 to move the scattered conductor core until the two strands are staggered and tightened, thereby realizing the connection between the two cables.

[0047] An observation strip 3 is fixedly installed on the inner wall of the movable cylinder 4 , wherein the observation strip 3 penetrates the inner wall of the movable cylinder 4 . The observation strip 3 is made of transparent material. When the movable cylinder 4 is rotated to tighten the two wires, the tightening situation can be directly observed through the observation strip 3 .

[0048] In addition, in order to facilitate the insertion of the top pressure strip 5 into the loose conductor core, the top pressure strip 5 is made of elastic material, so that the top pressure strip 5 can be inserted into the loose conductor core, so as to facilitate rotating the movable cylinder 4 to tighten the wire and realize the connection of the cable.

[0049] A limiting cone 8 is fixedly installed on the inner wall of the elastic arc plate 7. The limiting cone 8 is a triangular structure with a pointed top. As the closing cover 1 rotates, the elastic arc plate 7 gradually fits tightly against the insulating layer of the outer wall of the cable, and at this time the limiting cone 8 penetrates into the insulating layer.

[0050] After the cable is connected, the cable connection point will be subjected to stress on both sides of the cable. In order to reduce the stress borne by the wire connection point, the two fixing tubes 2 and the outer wall of the wire are connected. In order to improve the stability of the connection, the limiting cone 8 is tilted to facilitate the limiting cone 8 to penetrate the outer skin of the cable.

[0051] A plurality of limiting cones 8 are provided and evenly distributed in a ring shape along the axis of the elastic arc plate 7, so as to improve the stability of the force and make the outer wall of the cable evenly stressed.

[0052] A sealing ring 6 is fixedly installed on the inner wall of the elastic arc plate 7. The sealing ring 6 is made of elastic material and is a common rubber ring. When multiple elastic arc plates 7 clamp the outer wall of the cable, the sealing ring 6 is squeezed until the sealing ring 6 fits tightly against the outer wall of the cable, thereby achieving a sealed connection between the fixed tube 2 and the outer wall of the cable, preventing rainwater from entering the cable connection position and improving safety in later use.

[0053] A plurality of top pressure strips 5 are evenly arranged in an annular shape along the inner wall of the movable cylinder 4. When the movable cylinder 4 rotates, the plurality of top pressure strips 5 are synchronously driven to rotate synchronously, and when tightening the loose conductor core, uniform force is ensured as much as possible.

[0054] A closing strip 11 is fixedly installed on the radial inner wall of the movable cylinder 4, and the other end of the closing strip 11 is fixedly connected to the outer wall of the top pressure strip 5. The closing strip 11 is an elastic rubber strip. During the rotation of the movable cylinder 4, the conductor core is prevented from being stuck in the inner cavity of the top pressure strip 5.

[0055] An elastic strip 10 is fixedly mounted on the axial end of the movable cylinder 4 , and the elastic strip 10 is arranged obliquely, wherein the elastic strip 10 is evenly distributed in a ring shape along the axis of the movable cylinder 4 .

[0056] A limiting bevel block 9 is fixedly installed at one end of the fixed cylinder 2 close to the movable cylinder 4, and the tip of the elastic strip 10 fits with the inclined surface of the limiting bevel block 9. There are multiple limiting bevel blocks 9 evenly arranged in a ring shape along the axial direction of the fixed cylinder 2, and the elastic strips 10 and the limiting bevel blocks 9 correspond one to one.

[0057] Through the cooperation of the elastic strip 10 and the limiting bevel 9, the movable cylinder 4 can be limited to unidirectional rotation during the rotation of the movable cylinder 4 along the axis of the fixed cylinder 2, so that the movable cylinder 4 can only rotate in the direction of tightening the conductor core.

[0058] After the conductor core is tightened, the movable cylinder 4 is restricted from rotating in one direction, thereby preventing the top pressure strip 5 from rotating in the opposite direction after installation, thereby preventing the conductor core from loosening.

[0059] Embodiment 2: Figures 6 to 9 As shown in Comparative Example 1, another embodiment of the present invention is:

[0060] In order to prevent oxidation of the exposed conductor part, an injection tube 14 is fixedly installed on the outer wall of the movable cylinder 4. The inner cavity of the injection tube 14 is connected with the inner cavity of the movable cylinder 4. Cable oil is injected into the inner cavity of the movable cylinder 4 through the injection tube 14. After the cable oil fills the inner cavities of the movable cylinder 4 and the fixed cylinder 2, the exposed wires are immersed in the cable oil to isolate oxygen and prevent oxidation, while also improving the heat dissipation effect of the wires.

[0061] A baffle plate 16 is fixedly installed in the inner cavity of the injection tube 14, and a truncated cone-shaped through hole is opened on the inner wall of the baffle plate 16. The inner cavity of the injection tube 14 is provided with a sealing plug 19 for sealing the baffle plate 16. The sealing plug 19 is a truncated cone-shaped through hole. The baffle plate 16 is blocked by the sealing plug 19, so that the inner cavity of the fixed cylinder 2 is closed after filling with cable oil.

[0062] A hollow bracket 18 is fixedly mounted on the inner wall of the liquid injection tube 14, and the through hole in the hollow bracket 18 is used for cable oil to pass through.

[0063] A guide rod 17 is slidably mounted on the inner wall of the hollow bracket 18 , one end of the guide rod 17 is fixedly connected to the bottom center of the sealing plug 19 , and the sliding guide rod 17 controls the sliding of the sealing plug 19 .

[0064] The bottom surface of the sealing plug 19 is elastically connected to the upper end surface of the hollow bracket 18. A spring is fixedly installed on the bottom surface of the sealing plug 19. The other end of the spring is fixedly connected to the outer wall of the hollow bracket 18. The sealing plug 19 is pressed by the elastic force of the spring, so that the sealing plug 19 has a tendency to fit with the blocking plate 16 in real time.

[0065] When injecting cable oil, the sealing plug 19 is pressed to control the sealing plug 19 to separate from the blocking plate 16, and the blocking plate 16 is controlled to be conductive, so as to facilitate the entry of the cable oil.

[0066] A heat conducting plate 13 is fixedly mounted on the inner wall of the fixed cylinder 2, one end of the heat conducting plate 13 extends to the outer wall of the fixed cylinder 2, wherein one end of the heat conducting plate 13 extends to the inner cavity of the cable oil to facilitate the conduction of heat energy in the cable oil.

[0067] The heat conducting plate 13 is made of insulating material. In this embodiment, the heat conducting plate 13 is made of ceramic material, which not only has good heat conduction effect, but also can be insulated to prevent leakage.

[0068] In order to improve the heat dissipation efficiency, a plurality of heat conducting plates 13 are provided, and a plurality of heat conducting plates 13 are evenly provided along the outer wall of the fixing tube 2, thereby increasing the contact area between the heat conducting plates 13 and the cable oil to achieve the purpose of improving the effect.

[0069] A drainage hole for drainage is provided at the bottom of the fixed cylinder 2. A sealing plug 15 for blocking the drainage hole is provided inside the fixed cylinder 2. The sealing plug 15 is an elastic rubber plug for blocking the drainage hole.

[0070] When removing the separated cable, it is first necessary to drain the cable oil in the inner cavity of the fixed cylinder 2. At this time, the closing plug 15 is pulled out to discharge the cable oil through the drainage hole. It should be noted that when draining the oil, it is necessary to press the sealing plug 19 to keep the baffle 16 unobstructed, so as to maintain the air pressure balance in the inner cavity of the fixed cylinder 2 when draining the oil.

[0071] The upper end of the closing plug 15 is a conical structure, and the shape of the drainage hole is adapted to the closing plug 15. The closing plug 15 is pressed against the inner wall of the fixed cylinder 2 to block the drainage hole, and the bottom of the fixed cylinder 2 is kept closed when liquid is injected.

[0072] The inner cavity of the movable cylinder 4 is provided with a tightening wire 12 , which is distributed in a spiral shape and is located outside the conductor core.

[0073] One end of the tightening wire 12 is fixedly connected to the outer wall of the top pressure strip 5, and the other end of the tightening wire 12 is fixedly connected to the outer wall of the closing plug 15. Rotating the movable cylinder 4 drives the top pressure strip 5 to rotate, and then pulls the tightening wire 12. One end of the tightening wire 12 rotates along the axis of the movable cylinder 4. As one end of the tightening wire 12 rotates, the tightening wire 12 gradually tightens, thereby tightening the loose conductor core inside and improving the stability of the connection. In addition, as the tightening wire 12 is tightened, the closing plug 15 and the drainage through hole are pulled to fit tightly, thereby achieving the closure of the fixed cylinder 2.

[0074] The inner wall of the movable cylinder 4 is provided with an adhesive film 20, and the tightening line 12 is fixed to the inner wall of the movable cylinder 4 through the adhesive film 20. Before the movable cylinder 4 rotates, the tightening line 12 is adhered to the inner wall of the movable cylinder 4 through the adhesive film 20. When the movable cylinder 4 is rotated, the tightening line 12 is tightened, thereby tearing the adhesive film 20.

[0075] The adhesive film 20 is provided to prevent the loose conductor core from being intertwined with the tightening wire 12 when the cable passes through the movable cylinder 4, so as to facilitate the cable to pass through the interior of the movable cylinder 4 smoothly.

[0076] The above-mentioned front, back, left, right, top and bottom are all based on the figures in the specification. Figure 1 As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0077] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0078] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A cable connection device, characterized in that: It includes a main body shell and a fastening mechanism; When the cables are connected, the two main body shells are sleeved on the outside of the cables, and the connecting parts of the two main body shells are rotatably connected; The main body shell comprises a fixed cylinder (2) and a movable cylinder (4), and one axial end of the movable cylinder (4) is rotatably connected to the axial end of the fixed cylinder (2); The fastening mechanism comprises an elastic arc plate (7) and a closed cover (1), wherein the elastic arc plate (7) is fixedly mounted on an end of the fixed cylinder (2) away from the movable cylinder (4), and the closed cover (1) is sleeved on the outside of the cable and connected to the elastic arc plate (7) by means of internal and external threads. A pressing strip (5) for pressing the conductor is fixedly mounted on the inner wall of the movable cylinder (4), and the pressing strip (5) is arranged at an angle; A limiting cone (8) is fixedly mounted on the inner wall of the elastic arc plate (7), the limiting cone (8) is arranged obliquely, and a plurality of the limiting cones (8) are arranged, and the plurality of limiting cones (8) are evenly distributed in a ring shape along the axis of the elastic arc plate (7); A sealing ring (6) is fixedly mounted on the inner wall of the elastic arc plate (7), and the sealing ring (6) is made of an elastic material; An observation strip (3) is fixedly mounted on the inner wall of the movable cylinder (4); A plurality of top pressure strips (5) are evenly arranged in an annular shape along the inner wall of the movable cylinder (4); a closing strip (11) is fixedly mounted on the radial inner wall of the movable cylinder (4); and the other end of the closing strip (11) is fixedly connected to the outer wall of the top pressure strip (5); An elastic strip (10) is fixedly mounted on the axial end of the movable cylinder (4), and the elastic strip (10) is arranged obliquely; a limiting inclined block (9) is fixedly mounted on one end of the fixed cylinder (2) close to the movable cylinder (4), and the tip of the elastic strip (10) is in contact with the inclined surface of the limiting inclined block (9); A drainage hole for draining liquid is provided at the bottom of the fixed cylinder (2), a sealing plug (15) for blocking the drainage hole is provided inside the fixed cylinder (2), the upper end of the sealing plug (15) is a conical structure, and the shape of the drainage hole matches that of the sealing plug (15); The inner cavity of the movable cylinder (4) is provided with a tightening wire (12), one end of the tightening wire (12) is fixedly connected to the outer wall of the top pressure strip (5), and the other end of the tightening wire (12) is fixedly connected to the outer wall of the closing plug (15); The inner wall of the movable cylinder (4) is provided with an adhesive film (20), and the tightening wire (12) is fixed to the inner wall of the movable cylinder (4) via the adhesive film (20).

2. A cable connection device according to claim 1, characterized in that: An injection tube (14) is fixedly mounted on the outer wall of the movable cylinder (4); the inner cavity of the injection tube (14) is in communication with the inner cavity of the movable cylinder (4); a blocking plate (16) is fixedly mounted on the inner cavity of the injection tube (14); a truncated cone-shaped through hole is provided on the inner wall of the blocking plate (16); and a sealing plug (19) is provided in the inner cavity of the injection tube (14) for sealing the blocking plate (16).

3. A cable connection device according to claim 2, characterized in that: A hollow bracket (18) is fixedly mounted on the inner wall of the injection tube (14), a guide rod (17) is slidably mounted on the inner wall of the hollow bracket (18), one end of the guide rod (17) is fixedly connected to the bottom center position of the sealing plug (19), and the bottom surface of the sealing plug (19) is elastically connected to the upper end surface of the hollow bracket (18).

4. A cable connection device according to claim 3, characterized in that: A heat conducting plate (13) is fixedly mounted on the inner wall of the fixed cylinder (2), one end of the heat conducting plate (13) extends to the outer wall of the fixed cylinder (2), and the heat conducting plate (13) is made of insulating material; A plurality of the heat conducting plates (13) are provided, and a plurality of the heat conducting plates (13) are evenly provided along the outer wall of the fixed cylinder (2).

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