Prefabricated cable intermediate joint and installation method thereof

Abstract

The invention discloses a prefabricated cable intermediate joint and an installation method thereof, the prefabricated cable intermediate joint comprises a hardware fitting connecting piece, the hardware fitting connecting piece comprises two groups of anti-retreating assemblies and a conductive connecting piece, and each anti-retreating assembly comprises a binding post, a locking Haver clamp and a constant force spring; the outer wall of one axial end of the binding post is provided with an annular clamping groove, the other end of the binding post is provided with a connecting structure used for being connected with a conductive connecting piece, and the end, provided with the annular clamping groove, of the binding post is provided with a conductor jack. Annular protrusions are arranged at the two ends of the locking Haver clamp, an annular groove is formed in the outer wall of the locking Haver clamp, and the constant-force spring is wound in the annular groove. An annular clamping groove is also formed in the outer wall of the end part of the cable insulating layer; annular bulges at the two ends of the locking Haver clamp are respectively embedded into the annular clamping groove of the binding post and the annular clamping groove of the cable insulating layer; a traditional fixing mode depending on friction force or destructive occlusal force is changed, pure mechanical rigid interlocking is achieved, cable insulation retraction resistance can be provided, and the problem of axial retraction is fundamentally solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power transmission equipment, in particular to a prefabricated cable intermediate joint and a mounting method thereof. BACKGROUND

[0002] As a core component for connecting two sections of cables, the reliability of the cable intermediate joint directly determines the safety and stability of power transmission. However, in the long-term operation process, due to factors such as material properties, environmental stress, and operating conditions, the existing prefabricated joint still faces two key technical problems: insulation layer axial shrinkage and cable retreat. These two problems have become part of the causes of joint failure and power supply interruption.

[0003] During the long-term operation of the cable, the insulation layer is prone to axial shrinkage due to factors such as environmental temperature fluctuations, conductor heating, material stress release, and aging. In particular, XLPE insulation material will produce an axial shrinkage of 0.5%-2% along the length of the cable under long-term high-temperature operation. This will generate air gaps or defects at the cable insulation end port, causing partial discharge, and in severe cases, can lead to insulation breakdown. The cable retreat problem directly affects the stability of the electrical connection. During the operation of the cable, external factors such as vibration and mechanical impact can cause the intermediate joint connection site to loosen or misalign. This retreat phenomenon can reduce the contact area of the conductor connection, misalign the intermediate joint, and cause the contact resistance to grow exponentially, leading to overheating of the joint and discharge and breakdown caused by misalignment.

[0004] With the development of the power system towards high voltage and large capacity, the traditional joint structure has been difficult to meet the technical requirements. The cable intermediate joint anti-shrinkage scheme in the prior art has the shortcomings of insufficient fixing force and poor reliability. At the same time, in terms of electrical connection, there are drawbacks such as strong tool dependence and poor consistency. Therefore, it has become an urgent need in the field of power transmission and distribution to develop an innovative structure that can simultaneously solve the problems of insulation axial shrinkage and cable retreat, and is suitable for the fast installation characteristics of prefabricated joints. SUMMARY

[0005] The present application aims to overcome the technical defects of the existing prefabricated cable intermediate joint, such as interface air gap caused by insulation layer axial shrinkage and poor contact caused by cable retreat, and provides a prefabricated cable intermediate joint with compact structure, convenient installation, and simultaneous realization of insulation rigid fixation and cable reliable anti-retreat, as well as a mounting method thereof, to meet the technical requirements of low failure, fast installation, and long life for cable joints in medium and high voltage transmission and distribution lines.

[0006] The present application is implemented as follows: According to a first aspect of the present application, the present application provides a prefabricated cable intermediate joint, comprising a hardware connector, the hardware connector comprising two sets of anti-backoff components and a conductive connector, the anti-backoff components being connected to both the cable core and the cable insulation layer, the two sets of anti-backoff components being connected to two cables to be connected respectively, and the conductive connector being mechanically and electrically connected to the two sets of anti-backoff components.

[0007] Preferably, the anti-backoff component comprises a terminal post, a stop harper clamp and a constant force spring, the terminal post being made of conductive material; an annular clamping groove is arranged on the outer wall of one axial end of the terminal post, and a connecting structure for connecting to the conductive connector is arranged on the other axial end of the terminal post, and a conductor insertion hole for inserting the cable core is arranged on the one end of the terminal post provided with the annular clamping groove; the stop harper clamp is provided with annular protrusions on both ends, and an annular groove is arranged on the outer wall of the stop harper clamp, and the constant force spring is wound in the annular groove on the outer wall of the stop harper clamp; an annular clamping groove is also arranged on the outer wall of the end of the cable insulation layer, and the annular protrusions on both ends of the stop harper clamp are respectively embedded in the annular clamping grooves of the terminal post and the cable insulation layer.

[0008] Preferably, the conductive connector uses a conductive nut, and the connecting structure arranged on the terminal post is an external thread matched with the internal thread of the conductive nut.

[0009] Preferably, the conductive nut is in a cylindrical structure, a plurality of annular grooves are arranged on the outer wall of the conductive nut, each annular groove is arranged in sequence along the axial direction of the conductive nut, and a conductive sheet is wound in each annular groove.

[0010] Preferably, the prefabricated cable intermediate joint further comprises two sets of stress cone assembly components and a joint epoxy main body, the joint epoxy main body is hollow, and the hardware connector is located in the joint epoxy main body; one set of stress cone assembly components is connected to each end of the joint epoxy main body, and the two sets of stress cone assembly components are respectively located on both sides of the hardware connector and are connected to the two cables to be connected respectively.

[0011] Preferably, the stress cone assembly component comprises a tail pipe, a stress cone holder and a stress cone, the tail pipe and the stress cone are both sleeved on the cable, one end of the tail pipe is connected to the outer sheath of the cable, and the other end is connected to the joint epoxy main body; the stress cone holder is arranged in the tail pipe, and the stress cone holder is fixedly sleeved on the cable or fixedly connected to the tail pipe; one end of the stress cone abuts against the stress cone holder, and the other end tightly abuts against the inner wall of the end of the joint epoxy main body.

[0012] According to a second aspect of the present application, the present application provides a mounting method of a prefabricated cable intermediate joint, comprising the following steps: S100, pre-treatment and parts set: pre-treat both sides of the cable end to be connected, remove the outer sheath, metal shielding layer, semi-conductive layer to the specified size, expose the cable insulation layer and cable core; the tail pipe, stress cone support, stress cone are sequentially pre-assembled on both sides of the cable from inside to outside; S200, assemble the joint epoxy body: assemble the joint epoxy body on the A-side cable, and move the joint epoxy body along the cable axis to make the A-side cable core completely penetrate and expose the other end of the joint epoxy body, preparing for the subsequent installation of the hardware connector; S300, install the hardware connector, the specific steps are as follows: S310, crimp the A-side terminal post: wrap the A-side terminal post around the exposed cable core of the A-side cable, and crimp and fix them to ensure reliable crimping and good electrical contact; S320, install the conductive connector: connect the conductive connector with the A-side terminal post that has been crimped and fixed; S330, connect the B-side terminal post with the cable: connect the B-side terminal post with the conductive connector, then insert the exposed cable core of the B-side cable into the conductor insertion hole of the B-side terminal post, and crimp and fix them; S340, install the stop harper clamp and constant force spring: the two halves of the stop harper clamp are closed and wrapped around the joint of the two cables, and the ring-shaped protrusions at both ends are respectively inserted into the ring-shaped clamping grooves pre-processed on the cable insulation layer and the terminal post; then the constant force spring is wound and fastened in the ring-shaped groove provided on the outer wall of the stop harper clamp, and the continuous radial pressure provided by the constant force spring ensures that the stop harper clamp always remains locked, completing the rigid fixation and installation of the hardware connector; S400, final assembly and reset: move the joint epoxy body pre-assembled on the A-side cable to the middle of the joint, then install the joint epoxy body and stress cone assembly.

[0013] Preferably, the conductive connector uses a conductive nut, and the terminal post is provided with a connecting structure that matches the internal threads of the conductive nut. In step S320, the conductive nut is screwed onto the external threads of the A-side terminal post that has been crimped and fixed, and is tightened to a specified torque. In step S330, when connecting the B-side terminal post with the conductive connector, the external threads of the B-side terminal post are screwed into the other end of the conductive nut.

[0014] Preferably, the end of the tail pipe connected with the joint epoxy body is provided with a flange, both ends of the joint epoxy body are provided with a flange, the tail pipe and the joint epoxy body are connected through the flange and the bolt and nut assembly, and a sealing structure is provided on the contact surface of the flanges of the two.

[0015] Preferably, the specific steps of installing the connection joint epoxy body and stress cone assembly in step S400 are as follows: S410, first, the stress cone holder and stress cone wrapped around the two cables are adjusted and reset to the preset installation position along the cable axis, so that one end of the stress cone abuts against the stress cone holder and the other end aligns with the inner wall of the end of the joint epoxy body; S420, then move the tail pipe to the installation position, so that one end of the tail pipe away from the joint epoxy body is tightly attached to the cable outer sheath and is fixed by crimping or sealing glue, while ensuring that the flange on the other end of the tail pipe is aligned with the flange on the corresponding end of the joint epoxy body; S430, place a sealing structure between the flanges of the tail pipe and the joint epoxy body, pass through the bolts and cover the washers and nuts, and tighten them to the specified torque in a diagonal symmetrical order to achieve sealing and fixation of the two; S440, connect the cable metal shielding layer with the grounding device according to the conventional process to complete the grounding connection, and perform additional sealing treatment on the connection between the tail pipe and the cable outer sheath and the flange connection part, finally completing the installation of the entire prefabricated cable intermediate joint.

[0016] Compared with the prior art, the beneficial effects of the present application are: 1. The present application pre-processes precise annular clamping grooves on the terminal post and the cable insulation layer, and designs a stop harper clamp, the annular protrusions on the inner wall of which can be clamped into the two clamping grooves. This design changes the traditional fixation method relying on friction or destructive engagement force, realizes pure mechanical rigid interlocking, and can provide resistance to cable insulation retraction, fundamentally solving the problem of axial retraction.

[0017] 2. The present application sets annular grooves on the outer wall of the stop harper clamp and wraps them tightly with constant force springs. The constant force springs can ensure that the two halves of the stop harper clamp always provide persistent and uniform holding force, prevent them from loosening due to vibration or thermal cycling, and ensure the long-term reliability of the rigid interlocking mechanism; and this structure is faster to install than bolt fastening and does not require torque control.

[0018] 3. The present application creatively uses a conductive nut as the connection body, the axial center of which is provided with internal threads, the outer wall of which is provided with annular grooves for winding conductive sheets, and the two sides are matched with terminal posts with external threads. Threaded connection can provide a large contact pressure, making the contact resistance low and stable; the conductive sheet can expand the contact area, realize the electrical connection of rotary tightening, replace the traditional crimping or welding, and does not require large special crimping tools, making the installation more simple and efficient.

[0019] 4、The application does not damage the cable insulation body, the annular clamping groove on the cable insulation layer is formed by turning machining instead of being pierced by the metal teeth, thus avoiding damage to the cable insulation layer caused by installation, eliminating the electric field distortion points and breakdown risks caused thereby, and greatly improving the reliability of long-term operation of the joint. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the overall structure schematic diagram of the prefabricated cable intermediate joint provided by the application; Figure 2 is the structure schematic diagram of the hardware connecting piece.

[0021] In the figure: 1, tail pipe; 2, stress cone support; 3, stress cone; 4, joint epoxy body; 5, hardware connecting piece; 51, stop harper clamp; 52, constant force spring; 53, terminal post; 54, conductive nut; 541, conductive sheet; 55, cable core; 56, cable insulation layer. DETAILED DESCRIPTION

[0022] In the application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0023] The application will be further described below in combination with the drawings and specific embodiments: Embodiment 1

[0024] As Figure 1 and Figure 2As shown, the embodiment provides a prefabricated cable intermediate joint, which comprises a tail pipe 1, a stress cone holder 2, a stress cone 3, a joint epoxy body 4 and a hardware connecting piece 5. The hardware connecting piece 5 comprises a terminal post 53, a stop harper clamp 51, a constant force spring 52 and a conductive nut 54. The terminal post 53 and the conductive nut 54 are made of metal conductive materials such as brass, and the outer wall of the axial one end of the terminal post 53 is provided with an annular clamping groove, and the axial other end is provided with an external thread for connecting with the conductive nut 54. The terminal post 53 is provided with a conductor insertion hole for the cable core 55 at the end of the annular clamping groove. The two ends of the stop harper clamp 51 are provided with annular protrusions, and the outer wall of the stop harper clamp 51 is provided with an annular groove. The constant force spring 52 is wound in the annular groove on the outer wall of the stop harper clamp 51. The outer wall of the end of the cable insulation layer 56 is also provided with an annular clamping groove. The width of the annular clamping grooves on the terminal post 53 and the cable insulation layer 56 matches the annular protrusions of the stop harper clamp 51, and the annular protrusions of the two ends of the stop harper clamp 51 are respectively embedded in the annular clamping grooves of the terminal post 53 and the cable insulation layer 56. The conductive nut 54 is in a cylindrical structure, and the outer wall of the conductive nut 54 is provided with a plurality of annular grooves, which are evenly arranged along the axial direction of the conductive nut 54, and each annular groove is wound with a conductive sheet 541.

[0025] As shown, Figure 1 The joint epoxy body 4 is hollow, and the hardware connecting piece 5 is located in the joint epoxy body 4. The tail pipe 1 and the stress cone 3 are both sleeved on the cable, one end of the tail pipe 1 is connected with the outer sheath of the cable, and the other end is connected with the joint epoxy body 4; the stress cone holder 2 is arranged in the tail pipe 1, and the stress cone holder 2 is fixedly sleeved on the cable or fixedly connected with the tail pipe 1; one end of the stress cone 3 abuts against the stress cone holder 2, and the other end tightly abuts against the end inner wall of the joint epoxy body 4. The end of the tail pipe 1 connected with the joint epoxy body 4 is provided with a flange, and the two ends of the joint epoxy body 4 are both provided with flanges. The tail pipe 1 and the joint epoxy body 4 are connected through the flanges and bolt nut assemblies, and the contact surfaces of the flanges of the two are provided with sealing structures such as sealing washers and sealing glue. Embodiment 2

[0026] The embodiment provides a mounting method of a prefabricated cable intermediate joint, which comprises the following steps: S100, pretreatment and part assembly: pretreat the cable ends to be connected on both sides, remove the outer sheath, metal shielding layer and semi-conductive layer to a specified size, and expose the cable insulation layer 56 and the cable core 55. The tail pipe 1, the stress cone holder 2 and the stress cone 3 are sequentially pre-assembled on the cables on both sides from inside to outside.

[0027] S200, the joint epoxy body 4 is fully fitted on the A side cable, and the joint epoxy body 4 is moved along the cable axial direction, so that the A side cable core is completely penetrated and exposed at the other end of the joint epoxy body 4, and the preparation for the subsequent installation of the hardware connecting piece 5 is completed.

[0028] S300, the hardware connecting piece 5 is installed, and the specific steps are as follows: S310, the A side terminal post 53 is crimped: the A side terminal post 53 is sleeved on the exposed cable core of the A side cable, and the two are crimped and fixed, so as to ensure reliable crimping and good electrical contact; S320, the conductive connecting piece is installed: the conductive nut 54 is screwed into the outer thread of the A side crimped and fixed terminal post 53, and is tightened to the specified torque; S330, the B side terminal post 53 is connected with the cable: the outer thread of the B side terminal post 53 is screwed into the other end of the conductive nut 54, and then the exposed cable core 55 of the B side cable is inserted into the conductor insertion hole of the B side terminal post 53, and the two are crimped and fixed; S340, the stop harvester clamp 51 and the constant force spring 52 are installed: the two halves of the stop harvester clamp 51 are overlapped at the joint of the two side cables, and the annular protrusions at the two ends are respectively clamped into the annular clamping grooves pre-processed on the cable insulation layer and the annular clamping grooves of the terminal post 53; then the constant force spring 52 is wound and fastened in the annular groove provided on the outer wall of the stop harvester clamp 51, and the constant radial pressure provided by the constant force spring 52 ensures that the stop harvester clamp 51 always maintains the locked state, and the rigid fixing installation of the hardware connecting piece 5 is completed.

[0029] S400, assembly and reset: the joint epoxy body 4 pre-fitted on the A side cable is moved to the design position of the middle part of the joint, and then the connecting joint epoxy body 4 and the stress cone assembly are installed, and the specific steps are as follows: S410, the stress cone cone holder 2 and the stress cone 3 fitted on the two side cables are adjusted and reset to the pre-set installation position along the cable axial direction in sequence, so that one end of the stress cone 3 abuts against the stress cone cone holder 2, and the other end is aligned with the inner wall of the end part of the joint epoxy body 4; S420, the tail pipe 1 is moved to the installation position, so that one end of the tail pipe 1 away from the joint epoxy body 4 is closely attached to the cable outer sheath and is fixed by crimping or sealing glue, and at the same time, the flange plate at the other end of the tail pipe 1 is aligned with the flange plate at the corresponding end of the joint epoxy body 4; S430, the sealing structure is placed between the flange plate contact surface of the tail pipe 1 and the joint epoxy body 4, the bolt is penetrated and the gasket and nut are sleeved, and the tightening is carried out to the specified torque in the diagonal symmetry order, so as to realize the sealing and fixing of the two; S440, according to the conventional process connecting cable metal shielding layer and grounding device completes the grounding connection, and to the tail pipe 1 and the cable outer sheath The connection, flange connection part is sealed additionally, finally completes the installation of the whole prefabricated cable intermediate joint.

[0030] In summary, the present application has the following beneficial effects: 1、The present application pre-processed precise alignment annular clamping groove on the terminal post 53 and the cable insulation layer 56, and designed the stop harver clamp 51, the annular protrusions on the inner wall of both ends can be clamped into the two clamping grooves. The design changes the traditional fixation method which relies on friction or destructive engagement force, realizes the pure mechanical rigid interlocking, can provide the anti-cable insulation retraction ability, fundamentally solves the problem of axial retraction.

[0031] 2、The present application sets annular groove on the outer wall of the stop harver clamp 51, and adopts constant force spring 52 to wrap and tighten. The constant force spring 52 can ensure that the two half shells of the stop harver clamp 51 always provide persistent and uniform holding force, prevent loosening due to vibration or thermal cycle, and ensure the long-term reliability of the rigid interlocking mechanism; and the structure is faster to install than bolt fastening, without torque control.

[0032] 3、The present application creatively adopts the conductive nut 54 as the connection main body, the conductive nut 54 is provided with inner threads in the axial center, the outer wall is provided with annular groove for winding the conductive sheet 541, and the two sides are matched with the terminal post 53 provided with outer threads. Threaded connection can provide huge contact pressure, so that the contact resistance is low and stable; the conductive sheet 541 can enlarge the contact area, realize the electrical connection of rotary tightening, replace the traditional pressure welding or welding, without large special pressure welding tool, and the installation is more simple and efficient.

[0033] 4、The whole fixing scheme (annular clamping groove of the terminal post 53 and the cable insulation layer 56, annular protrusion of the stop harver clamp 51) of the present application does not damage the cable insulation body. Among them, the annular clamping groove on the cable insulation layer 56 is formed by turning machining, not by metal teeth, avoiding damage to the cable insulation layer 56 caused by installation, eliminating the electric field distortion point and breakdown hazard generated thereby, and greatly improving the reliability of the joint during long-term operation.

[0034] The above is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A preformed cable splice, characterized by The utility model provides a cable connector, including gold utensil connecting piece (5), gold utensil connecting piece (5) includes two groups of anti -backing subassembly and conductive connecting piece, anti -backing subassembly is connected with cable core and cable insulation layer simultaneously, two groups of anti -backing subassembly are connected with two cables needing to be connected respectively, and conductive connecting piece is mechanically and electrically connected with two groups of anti -backing subassembly.

2. The preformed cable splice of claim 1, wherein, The anti -backing subassembly includes terminal post (53), stop harper clamp (51) and constant -force spring (52), the terminal post (53) is made of conductive material, the terminal post (53) is provided with annular clamping groove on the outer wall of one end in the axial direction, and is provided with connecting structure for being connected with the conductive connecting piece on the other end in the axial direction, the terminal post (53) is provided with conductor insertion hole for cable core insertion on the one end of the terminal post (53) provided with annular clamping groove, the stop harper clamp (51) is provided with annular protrusion on both ends, and is provided with annular groove on the outer wall, the constant -force spring (52) is wound in the annular groove on the outer wall of stop harper clamp (51), the outer wall of the end of cable insulation layer is also provided with annular clamping groove, and the annular protrusion of stop harver clamp (51) on both ends is embedded in the annular clamping groove of terminal post (53) and cable insulation layer respectively.

3. The preformed cable intermediate joint of claim 2, wherein, The conductive connecting piece uses a conductive nut (54), and the connecting structure of the terminal post (53) is an external thread matched with an internal thread of the conductive nut (54).

4. The preformed cable splice of claim 3, wherein, The conductive nut (54) is in a cylindrical structure, a plurality of annular grooves are arranged on the outer wall of the conductive nut (54), each annular groove is sequentially arranged along the axial direction of the conductive nut (54), and a conductive sheet (541) is wound in each annular groove.

5. A preformed cable intermediate joint according to any one of claims 2 to 4, characterised in that, It also includes two groups of stress cone assembly components and a joint epoxy body (4), the joint epoxy body (4) is hollow, and the gold utensil connecting piece (5) is located in the joint epoxy body (4); one group of stress cone assembly components is connected to each end of the joint epoxy body (4), and the two groups of stress cone assembly components are respectively located on both sides of the gold utensil connecting piece (5) and are connected to the two cables needing to be connected.

6. The preformed cable splice of claim 5, wherein, The stress cone assembly component includes a tail pipe (1), a stress cone holder (2), and a stress cone (3), the tail pipe (1) and the stress cone (3) are both sleeved on the cable, one end of the tail pipe (1) is connected to the outer sheath of the cable, and the other end is connected to the joint epoxy body (4); the stress cone holder (2) is arranged in the tail pipe (1), and the stress cone holder (2) is fixedly sleeved on the cable or fixedly connected to the tail pipe (1); one end of the stress cone (3) is in abutment with the stress cone holder (2), and the other end is tightly attached to the inner wall of the end of the joint epoxy body (4).

7. A method of installing a preformed cable intermediate joint as claimed in claim 6, characterised in that, The method comprises the following steps: S100, pretreatment and part assembly: pretreat the cable ends on both sides to be connected, remove the outer sheath, metal shielding layer, and semi-conductive layer to a specified size, and expose the cable insulation layer and cable core; the tail pipe (1), stress cone holder (2), and stress cone (3) are sequentially pre-assembled on the cables on both sides from inside to outside; S200, the joint epoxy body (4): the joint epoxy body (4) is all installed on the A side cable, and the joint epoxy body (4) is moved along the cable axial direction, so that the A side cable core is completely penetrated and exposed at the other end of the joint epoxy body (4), so as to prepare for the subsequent installation of the hardware connecting piece (5); S300, install the hardware connecting piece (5), and the specific steps are as follows: S310, crimp the A side terminal post (53): the A side terminal post (53) is sleeved on the exposed cable core of the A side cable, and the two are crimped and fixed; S320, install the conductive connecting piece: the conductive connecting piece is connected with the A side crimped and fixed terminal post (53); S330, connect the B side terminal post (53) and the cable: the B side terminal post (53) is connected with the conductive connecting piece, then the exposed cable core of the B side cable is inserted into the conductor insertion hole of the B side terminal post (53), and the two are crimped and fixed; S340, install the stop harvester clamp (51) and the constant force spring (52): the two halves of the stop harvester clamp (51) are overlapped on both sides of the cable joint, and the ring-shaped protrusions at both ends are respectively clamped into the ring-shaped clamping grooves and the ring-shaped clamping grooves of the terminal post (53) which are processed in advance on the cable insulation layer; then the constant force spring (52) is wound and fastened in the ring-shaped groove provided on the outer wall of the stop harvester clamp (51), and the continuous radial pressure provided by the constant force spring (52) ensures that the stop harvester clamp (51) always maintains a locked state, and the rigid fixing and installation of the hardware connecting piece (5) is completed; S400, assembly and reset: the joint epoxy body (4) pre-installed on the A side cable is moved to the middle part of the joint, then the joint epoxy body (4) and the stress cone assembly are installed.

8. The method of installing a preformed cable intermediate joint according to claim 7, wherein, The conductive connecting piece uses a conductive nut (54), and the connecting structure of the terminal post (53) is an external thread matched with the internal thread of the conductive nut (54); In step S320, the conductive nut (54) is screwed into the external thread of the A side crimped and fixed terminal post (53) and is tightened to a specified torque; In step S330, when the B side terminal post (53) is connected with the conductive connecting piece, the external thread of the B side terminal post (53) is screwed into the other end of the conductive nut (54).

9. The method of installing a preformed cable intermediate joint according to claim 7, wherein, The end of the tail pipe (1) connected with the joint epoxy body (4) is provided with a flange, both ends of the joint epoxy body (4) are provided with flanges, the tail pipe (1) and the joint epoxy body (4) are connected through the flanges and bolt and nut assemblies, and sealing structures are arranged on the contact surfaces of the flanges of the tail pipe (1) and the joint epoxy body (4).

10. The method of installing a preformed cable intermediate joint according to claim 9, wherein, In step S400, the specific steps of installing the joint epoxy body (4) and the stress cone assembly are as follows: S410, first, the stress cone holder (2) and the stress cone (3) sleeved on both sides of the cable are adjusted and reset to the preset installation position along the cable axial direction, so that one end of the stress cone (3) abuts against the stress cone holder (2), and the other end is aligned with the end inner wall of the joint epoxy body (4); S420, move the tail pipe (1) to the installation position, make the tail pipe (1) far away from the one end of the joint epoxy body (4) closely contact with the cable outer sheath and fixed by crimping or sealing glue, at the same time, ensure the flange plate of the other end of the tail pipe (1) align with the flange plate of the corresponding end of the joint epoxy body (4); S430, place the sealing structure between the tail pipe (1) and the flange plate of the joint epoxy body (4), pass through the bolt and cover the washer, nut, tighten to the specified torque according to the diagonal symmetry order, realize the sealing and fixing of the two; S440, connect the cable metal shielding layer with the grounding device according to the conventional process to complete the grounding connection, and carry out additional sealing treatment on the connection between the tail pipe (1) and the cable outer sheath and the flange plate connection part, finally complete the installation of the whole prefabricated cable intermediate joint.

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