A concentric cable

Abstract

The present invention relates to the field of cable technology, and in particular to a coaxial cable, including a coaxial cable connector connected between a short cable 1 and a short cable 2 for connecting the short cable 1 and the short cable 2 into a long coaxial cable; the coaxial cable connector includes two three-level step connection sleeves respectively sleeved on the short cable 1 and the short cable 2, an open-type clamping ring for connecting the two three-level step connection sleeves, and a connecting and fixing cylinder sleeved on the outside of the three-level step connection sleeve and the open-type clamping ring. The coaxial cable connector provided by the present invention can stably connect two adjacent short cables together through the cooperation of the three-level step connection sleeve, the open-type clamping ring, and the connecting and fixing cylinder, so as to avoid twisting, bending or breaking at the connection, resulting in deformation of the central conductor and directly reducing the quality of current signal transmission or interrupting the current signal transmission.

Description

Technical Field

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

[0002] Concentric cable, also known as coaxial cable, is a common type of transmission line. It consists of a center conductor, an insulating layer, a shielding layer, a protective cover, etc. The center conductor is used for current signal transmission. This structure can effectively reduce the impact of external electromagnetic interference on the current signal, and can also reduce the loss of current signal transmission. Therefore, it is widely used in a variety of occasions that require stable power transmission. At present, concentric cables often require long-distance transmission cables when in use, but because the length of a single cocentric cable is limited, it is necessary to connect multiple cocentric cables one by one to form a long-distance transmission cable. However, due to the pulling of cables in different directions and heights during cable laying or use, the connection between adjacent cocentric cables may be twisted, bent or broken. Twisting or bending will cause the center conductor to deform, directly reducing the quality of current signal transmission, and breaking will directly lead to interruption of current signal transmission. Summary of the invention

[0003] Technical problem to be solved: The present invention provides a concentric cable that can solve the above-mentioned problems.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a coaxial cable, comprising a short cable 1, a short cable 2 and a coaxial cable connector connected between the short cable 1 and the short cable 2 for connecting the short cable 1 and the short cable 2 into a long coaxial cable; wherein: the structures of the short cable 1 and the short cable 2 are, from the inside to the outside, a central conductor, an insulating layer, a shielding layer, and a protective cover, and the ends of the short cable 1 and the short cable 2 are both stepped structures with the central conductor, the insulating layer, and the shielding layer leaking out in sequence.

[0005] The concentric cable connector comprises two three-level step connection sleeves respectively sleeved on the short cable 1 and the short cable 2, an open clamp ring for connecting the two three-level step connection sleeves, and a connecting fixing cylinder sleeved outside the three-level step connection sleeve and the open clamp ring.

[0006] As a preferred technical solution of the present invention, the three-level step connecting sleeve is hollow inside and has a stepped hole structure that matches the stepped structure at the ends of short cable one and short cable two; the part where the three-level step connecting sleeve matches the protective sleeve is provided with four stepped holes that are evenly distributed circumferentially and extend radially, and a positioning component for preliminarily positioning the three-level step connecting sleeve and the protective sleeve is provided in the stepped hole; the positioning component includes a T-shaped positioning rod, and one end of the T-shaped positioning rod close to the center of the three-level step connecting sleeve is an arc-shaped structure, and an arc-shaped groove that matches the arc-shaped structure of the T-shaped positioning rod is provided on the outer wall of the protective sleeve, and the T-shaped positioning rod is slidably installed in the stepped hole by a spring, and the spring sleeve is arranged on the outside of the T-shaped positioning rod and one end is fixedly connected to the T-shaped positioning rod, and the other end is fixedly connected to the arc-shaped groove.

[0007] As a preferred technical solution of the present invention, the open-type clamping ring is an annular structure, an opening is provided on the circumferential side of the annular structure, and the open-type clamping ring is made of elastic material; the left and right axial sides of the open-type clamping ring are symmetrical secondary step groove structures, and the outer surface of the three-level step connecting sleeve is a stepped structure. When the open-type clamping ring is clamped on the three-level step connecting sleeve, the secondary step groove structure inside the open-type clamping ring and the outer surface of the three-level step connecting sleeve cooperate with the circumferential part of the insulation layer and shielding layer leaked out of short cable one and short cable two.

[0008] As a preferred technical solution of the present invention, the outer circumferential surface of the mating part of the three-level stepped connecting sleeve, the insulating layer and the shielding layer is evenly provided with four snap-in grooves in the circumferential direction, and the inner ring surface of the secondary step groove of the open-type snap ring is provided with snap-in blocks used in conjunction with the snap-in grooves. The number of the snap-in blocks is three and they are distributed at 90-degree intervals, and the middle snap-in block is arranged opposite to the opening of the open-type snap ring.

[0009] As a preferred technical solution of the present invention, the connecting and fixing cylinder is composed of a cylinder with openings at both ends and annular plates 1 and 2 respectively arranged on the two side ends of the cylinder; the inner diameter of the annular plate 1 is consistent with the diameter of the protective sleeve and the annular plate 1 can slide and rotate on the outer surface of the protective sleeve; the inner ring surface of the annular plate 2 is a threaded structure, and an externally threaded sleeve is fixedly installed on the side of the large diameter end of the three-stage stepped connecting sleeve corresponding to the annular plate 2, and the externally threaded sleeve cooperates with the thread of the inner ring surface of the annular plate 2.

[0010] As a preferred technical solution of the present invention, an annular block 1 with an inclined inner wall is circumferentially arranged on the inner side of the connection between the cylinder and the annular plate 1, and an extrusion block 1 used in conjunction with the inclined surface of the annular block 1 is arranged on the side of the T-shaped positioning rod away from its arc structure; an annular block 2 with an inclined inner wall is circumferentially arranged in the middle of the inner annular surface of the cylinder, and an extrusion block 2 used in conjunction with the inclined surface of the annular block 2 is evenly arranged in the middle of the outer side surface of the open-type retaining ring; the minimum straight-line distance between the inner annular surface of the annular plate 2 and the cocentric cable axis is greater than the minimum straight-line distance between the extrusion block 1 and the extrusion block 2 and the cocentric cable axis; the inclined surfaces of the annular block 2 and the annular block 1 are evenly and rotatably installed with balls.

[0011] As a preferred technical solution of the present invention, the annular block 2, the extrusion block 2, the annular block 1 and the extrusion block 1 are all made of rubber.

[0012] As a preferred technical solution of the present invention, when short cable 1 and short cable 2 are connected to each other, the distance between the sides of two clamping grooves axially symmetrically opened on the two three-level step connecting sleeves is greater than the distance between the sides of two clamping blocks axially symmetrically distributed on the two three-level step connecting sleeves.

[0013] The two axially symmetrically distributed clamping blocks are close to each other on both sides and are inclined structures inclined from top to bottom away from the center conductor, and the corresponding clamping groove is provided with an inclined surface that matches the inclined structure of the clamping block and has the same inclined direction.

[0014] The present invention has the following beneficial effects: 1. The coaxial cable connector provided in the present invention can stably connect two adjacent short cables together through the three-level stepped connecting sleeve, the open clamp ring, and the connecting fixing tube, thereby avoiding twisting, bending or breaking at the connection, which causes deformation of the central conductor and directly reduces the quality of current signal transmission or interrupts the current signal transmission.

[0015] 2. The present invention achieves preliminary fixation between the three-level step connection sleeve and the short cable by setting a positioning component between the two, preventing the three-level step connection sleeve from rotating or moving axially at will after being installed, thereby affecting the smooth progress of the subsequent connection process, and at the same time improving the overall connection work efficiency.

[0016] 3. The present invention provides a clamping block and a clamping groove that cooperate with each other so that the open clamping ring and the two three-stage stepped connecting sleeves can neither rotate nor move axially, thereby avoiding the problems of distortion and disconnection at the connection between the adjacent short cables 1 and 2.

[0017] 4. The present invention further extrude the positioning assembly by cooperating with the provided annular block 1 and the extrusion block 1, thereby increasing the fixing effect between the three-stage stepped connecting sleeve and the protective sleeve, and avoiding the problem that the T-shaped positioning rod is disengaged from the arc groove and the axial positioning cannot be achieved by relying solely on the spring force; radial pressure is applied to the open-type clamping ring by cooperating with the provided extrusion block 2 and the annular block 2, thereby increasing the connection stability between the open-type clamping ring and the three-stage stepped connecting sleeve.

[0018] 5. The present invention sets the distance between the side surfaces of the two axially symmetrically arranged clamping grooves close to each other to be greater than the distance between the side surfaces of the two axially symmetrically arranged clamping blocks close to each other, and sets the side surfaces of the two axially symmetrically arranged clamping blocks close to each other to be a symmetrical inclined surface structure inclined from top to bottom away from the docking point. The corresponding clamping groove is provided with an inclined surface that matches the inclined surface structure of the clamping block and has the same inclined direction, which is beneficial to improving the tightness of the docking between the central conductors of two adjacent short cables, not only facilitating the insertion of the clamping block into the clamping groove, but also avoiding the inability to dock the central conductors of the two adjacent short cables due to relative axial movement caused by processing errors of the clamping block and the clamping groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 It is a schematic diagram of the cross-sectional structure of a long concentric cable after two adjacent short cables are connected according to the present invention.

[0021] Figure 2 It is a cross-sectional view of the open clamp ring, the three-stage stepped connecting sleeve and the clamping block of the present invention.

[0022] Figure 3 The present invention Figure 1 Enlarged view of point B in the middle.

[0023] Figure 4 The present invention Figure 1 Enlarged view of point C in the middle.

[0024] Figure 5 It is a cross-sectional view of the three-stage stepped connecting sleeve of the present invention.

[0025] Figure 6 It is a cross-sectional view of the connecting and fixing cylinder of the present invention.

[0026] In the figure: 1. short cable 1; 2. short cable 2; 3. concentric cable connector; 31. three-stage stepped connecting sleeve; 32. open clamping ring; 33. connecting fixing cylinder; 311. positioning assembly; 312. external threaded sleeve; 3111. T-shaped positioning rod; 3112. arc groove; 321. clamping block; 331. cylinder; 332. annular plate 1; 333. annular plate 2; 334. annular block 1; 335. extrusion block 1; 336. annular block 2; 337. extrusion block 2. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described below, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0028] See also Figure 1 A coaxial cable comprises a short cable 1, a short cable 2 and a coaxial cable connector 3 connected between the short cable 1 and the short cable 2; currently, the coaxial cables are packaged and stored by cutting them into short cables after production and inspection, but they usually need to be transported over long distances during use, so multiple coaxial cables need to be connected one by one to form a long-distance transmission cable. The present invention connects the short cables into long cables by setting a coaxial cable connector 3 to meet the use requirements.

[0029] See also Figure 1 The structures of the short cable 1 and the short cable 2 are, from the inside to the outside, a central conductor, an insulating layer, a shielding layer, and a protective cover, and the ends of the short cable 1 and the short cable 2 are both stepped structures, so that the central conductor, the insulating layer, and the shielding layer are exposed in sequence, which is convenient for connection with the coaxial cable connector 3.

[0030] See also Figure 1 The coaxial cable connector 3 includes two three-step step connection sleeves 31 respectively sleeved on the ends of the short cable 1 and the short cable 2, an open clamping ring 32 for connecting the two three-step step connection sleeves 31, and a connecting fixing tube 33 sleeved on the outside of the three-step step connection sleeves 31 and the open clamping ring 32.

[0031] See also Figure 1 and Figure 5The three-level stepped connecting sleeve 31 is hollow inside and has a stepped hole structure that matches the stepped structure at the ends of the short cable 1 and the short cable 2; the part where the three-level stepped connecting sleeve 31 matches with the protective sleeve is provided with four stepped holes that are evenly distributed circumferentially and extend radially, and a positioning component 311 is provided in the stepped hole for preliminarily positioning the three-level stepped connecting sleeve 31 and the protective sleeve.

[0032] See also Figure 1 and Figure 3 The positioning assembly 311 includes a T-shaped positioning rod 3111, and one end of the T-shaped positioning rod 3111 close to the center of the three-stage step connection sleeve 31 is an arc-shaped structure. An arc-shaped groove 3112 that cooperates with the arc-shaped structure of the T-shaped positioning rod 3111 is opened on the outer wall of the protective sleeve. The T-shaped positioning rod 3111 is slidably installed in the step hole through a spring. The spring is sleeved on the outside of the T-shaped positioning rod 3111 and one end is fixedly connected to the T-shaped positioning rod 3111 and the other end is fixedly connected to the inner wall of the arc groove 3112. Under the action of the spring, the T-shaped positioning rod 3111 is always facing the center of the three-stage step connection sleeve 31.

[0033] During specific use, the two three-level step connecting sleeves 31 are respectively sleeved on the short cable 1 and the short cable 2. When the arc structure of the T-shaped positioning rod 3111 is clamped in the arc groove 3112 on the protective sleeve, the two three-level step connecting sleeves 31 are installed in place, and the arc end of the T-shaped positioning rod 3111 is pressed against the arc groove 3112 under the elastic force of the spring. At this time, the stepped hole structure inside the three-level step connecting sleeve 31 is just engaged with the stepped structure at the end of the short cable 1 and the short cable 2. The positioning component 311 is set to achieve preliminary fixation of the three-level step connecting sleeve 31 to prevent it from rotating or moving axially at will after being sleeved, thereby preventing it from affecting the smooth progress of the subsequent connection process.

[0034] See also Figure 1 and Figure 2 The open clamp ring 32 is an annular structure, and an opening is provided on the circumferential side of the annular structure. The open clamp ring 32 is made of elastic material, which is convenient for the staff to clamp the open clamp ring 32 on the two three-stage stepped connecting sleeves 31.

[0035] See also Figure 1 The left and right sides of the open clamp ring 32 have symmetrical secondary step groove structures inside, and the outer surface of the three-level step connecting sleeve 31 has a stepped structure. When the open clamp ring 32 is clamped on the three-level step connecting sleeve 31, the secondary step groove structure inside the open clamp ring 32 matches the outer surface of the three-level step connecting sleeve 31 and the surface of the insulation layer and shielding layer leaking out of the short cable 1 and the short cable 2.

[0036] See also Figure 1 , Figure 2 and Figure 5The outer circumferential surface of the three-stage stepped connecting sleeve 31 and the matching part of the insulating layer and the shielding layer are uniformly provided with four snap-in grooves in the circumferential direction. The inner ring surface of the secondary step groove of the open clamping ring 32 is provided with a snap-in block 321 used in conjunction with the snap-in groove. The number of the snap-in blocks 321 is three and they are distributed at 90 degree intervals. The middle snap-in block 321 is arranged opposite to the opening of the open clamping ring 32.

[0037] When in use, after the two three-level step connecting sleeves 31 are respectively sleeved on the short cable 1 and the short cable 2, the central conductor parts of the short cable 1 and the short cable 2 are first connected to each other, and then the staff will sleeve the opening of the open clamp ring 32 towards the three-level step connecting sleeve 31, and when sleeved, align the clamping block 321 with the clamping groove. Since the open clamp ring 32 is elastic, the open clamp ring 32 can be deformed and sleeved on the two three-level step connecting sleeves 31 and recover after the sleeve is completed, thereby realizing the connection between the open clamp ring 32 and the two three-level step connecting sleeves 31. Due to the mutual cooperation between the clamping block 321 and the clamping groove, the open clamp ring 32 and the two three-level step connecting sleeves 31 can neither rotate nor move axially, thereby avoiding the problems of twisting, deformation and disconnection at the connection between the adjacent short cables 1 and 2.

[0038] See also Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6 The connecting and fixing cylinder 33 is composed of a cylinder 331 with openings at both ends and an annular plate 1 332 and an annular plate 2 333 respectively arranged at the ends of both sides of the cylinder 331; an annular block 1 334 with an inclined inner wall is circumferentially arranged on the inner side of the connection between the cylinder 331 and the annular plate 1 332, and an extrusion block 1 335 used in conjunction with the inclined surface of the annular block 1 334 is arranged on the side of the T-shaped positioning rod 3111 away from its arc-shaped structure; an annular block 2 336 with an inclined inner wall is circumferentially arranged in the middle of the inner annular surface of the cylinder 331, and an annular block 2 336 with an inclined inner wall is evenly arranged in the middle of the outer side surface of the open-type clamping ring 32 The inner diameter of the annular plate 332 is consistent with the diameter of the protective sleeve and the annular plate 332 can slide and rotate on the outer surface of the protective sleeve; the inner ring surface of the annular plate 333 is a threaded structure, and an external threaded sleeve 312 is fixedly installed on the side of the large diameter end of the three-level stepped connecting sleeve 31 corresponding to the annular plate 333, and the external threaded sleeve 312 cooperates with the thread of the inner ring surface of the annular plate 333; the minimum straight-line distance between the inner ring surface of the annular plate 333 and the coaxial cable axis is greater than the minimum straight-line distance between the extrusion block 1 335 and the extrusion block 2 337 and the coaxial cable axis.

[0039] When in use, first put the connecting and fixing cylinder 33 on the short cable 1, then put the three-level step connecting sleeve 31 without the external threaded sleeve 312 on the short cable 1, and put the three-level step connecting sleeve 31 with the external threaded sleeve 312 on the short cable 2. When the two three-level step connecting sleeves 31 are initially fixed to the protective sleeves and connected by the open clamping ring 32, push the connecting and fixing cylinder 33 from the short cable 1 to the short cable 2 until the annular plate 2 333 moves to the left side of the external threaded sleeve 312. At this time, rotate the connecting and fixing cylinder 33 so that the internal thread on the annular plate 2 333 is connected to the external thread of the external threaded sleeve 312 until the right side of the annular plate 1 332 is connected to the corresponding three-level step connecting sleeve The left side of 31 fits; in this process, the connecting and fixing cylinder 33 gradually moves to the right, and the annular block 1 334 with an inclined inner wall gradually squeezes the extrusion block 1 335, and the annular block 2 336 with an inclined inner wall gradually squeezes the extrusion block 2 337. The extrusion block 1 335 squeezes the positioning component 311, thereby further increasing the fixing effect between the three-stage stepped connecting sleeve 31 and the protective sleeve, thereby avoiding the problem that the T-shaped positioning rod 3111 is separated from the arc groove 3112 and the axial positioning cannot be achieved when relying solely on the spring force; the extrusion block 2 337 applies radial pressure to the open retaining ring 32 under the action of the annular block 2 336 with an inclined inner wall, thereby increasing the connection stability between the open retaining ring 32 and the three-stage stepped connecting sleeve 31.

[0040] See also Figure 1 , Figure 3 and Figure 6 The annular block 336 and the extrusion block 337 are both made of rubber, which prevents the problem of bending and deformation of the middle part of the open clamp 32 due to excessive extrusion force, thereby affecting the connection effect. The annular block 334 and the extrusion block 335 are both made of rubber, which prevents the annular block 334 and the extrusion block 335 from being rigidly squeezed to prevent the connection fixing cylinder 33 from being unable to be pushed and affecting the connection effect during the process of pushing the connection fixing cylinder 33 from the short cable 1 to the short cable 2.

[0041] See also Figure 1 , Figure 3 and Figure 6 The inclined surfaces of the annular block 2 336 and the annular block 1 334 are evenly rotated with balls installed, and the balls are used to reduce the friction resistance of the connecting fixing cylinder 33 during the movement from the short cable 1 to the short cable 2 2 and the rotation process.

[0042] When the short cable 1 and the short cable 2 are connected to each other, the distance between the sides of the two axially symmetrically left-right clamping grooves on the two three-level step connecting sleeves 31 is greater than the distance between the sides of the two axially symmetrically left-right clamping blocks 321. Therefore, when the open clamping ring 32 is clamped on the two three-level step connecting sleeves 31 and the clamping blocks 321 are matched with the corresponding clamping grooves, the short cable 1 and the short cable 2 tend to be closely connected, thereby increasing the connection effect and avoiding the problem that the center conductors cannot be connected due to the relative axial movement of the short cable 1 and the short cable 2 due to the processing errors of the clamping blocks 321 and the clamping grooves.

[0043] See also Figure 1 and Figure 4 The two sides of the two axially symmetrically distributed clamping blocks 321 that are close to each other are both inclined structures that are inclined from top to bottom in the direction away from the center conductor, and the corresponding clamping groove is provided with an inclined surface that matches the inclined structure of the clamping block 321 and has the same inclined direction, so as to facilitate the clamping of the open clamping ring 32 on the three-stage stepped connecting sleeve 31.

[0044] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0045] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integral connection, or a sliding connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A concentric cable, characterized in that: It comprises a short cable 1 (1), a short cable 2 (2), and a coaxial cable connector (3) connected between the short cable 1 (1) and the short cable 2 (2) for connecting the short cable 1 (1) and the short cable 2 (2) into a long coaxial cable; wherein: The structures of the short cable 1 (1) and the short cable 2 (2) are both central conductor, insulating layer, shielding layer, and protective cover from the inside to the outside, and the ends of the short cable 1 (1) and the short cable 2 (2) are both stepped structures in which the central conductor, insulating layer, and shielding layer are exposed in sequence; The coaxial cable connector (3) comprises two three-step step connection sleeves (31) respectively sleeved on the short cable 1 (1) and the short cable 2 (2), an open-type clamping ring (32) for connecting the two three-step step connection sleeves (31), and a connection fixing cylinder (33) sleeved on the outside of the three-step step connection sleeves (31) and the open-type clamping ring (32); The three-level stepped connection sleeve (31) is hollow inside and has a stepped hole structure that matches the stepped structure at the ends of the short cable one (1) and the short cable two (2); the portion where the three-level stepped connection sleeve (31) matches the protective sleeve is provided with four stepped holes that are evenly distributed in the circumferential direction and extend radially, and a positioning component (311) is provided in the stepped hole for preliminary positioning of the three-level stepped connection sleeve (31) and the protective sleeve; The positioning assembly (311) comprises a T-shaped positioning rod (3111), one end of the T-shaped positioning rod (3111) close to the center of the three-stage stepped connecting sleeve (31) is an arc-shaped structure, an arc-shaped groove (3112) matching the arc-shaped structure of the T-shaped positioning rod (3111) is provided on the outer wall of the protective sleeve, the T-shaped positioning rod (3111) is slidably installed in the stepped hole via a spring, the spring is sleeved on the outside of the T-shaped positioning rod (3111) and one end is fixedly connected to the T-shaped positioning rod (3111) and the other end is fixedly connected to the arc-shaped groove (3112); The connecting and fixing cylinder (33) is composed of a cylinder (331) with openings at both ends, and an annular plate 1 (332) and an annular plate 2 (333) respectively arranged at the ends of both sides of the cylinder (331); the inner diameter of the annular plate 1 (332) is consistent with the diameter of the protective sleeve, and the annular plate 1 (332) can slide and rotate on the outer surface of the protective sleeve; the inner ring surface of the annular plate 2 (333) is a threaded structure, and an external threaded sleeve (312) is fixedly installed on the side surface of the large diameter end of the three-stage stepped connecting sleeve (31) corresponding to the annular plate 2 (333), and the threads of the external threaded sleeve (312) and the inner ring surface of the annular plate 2 (333) cooperate with each other; The outer circumferential surfaces of the mating parts of the three-level stepped connection sleeve (31) and the insulating layer and the shielding layer are uniformly provided with four snap-fitting grooves, and the inner ring surface of the open snap ring (32) is provided with snap-fitting blocks (321) used in conjunction with the snap-fitting grooves; An annular block (334) having an inner wall with an inclined surface is circumferentially arranged on the inner side of the connection between the cylinder (331) and the annular plate (332); an extrusion block (335) used in conjunction with the inclined surface of the annular block (334) is arranged on the side of the T-shaped positioning rod (3111) away from its arc-shaped structure; an annular block (336) having an inner wall with an inclined surface is circumferentially arranged in the middle of the inner annular surface of the cylinder (331); and extrusion blocks (337) used in conjunction with the inclined surface of the annular block (336) are evenly arranged in the middle of the outer side surface of the open clamp (32).

2. A concentric cable according to claim 1, characterized in that: The open-type clamping ring (32) is an annular structure, and an opening is provided on the circumferential side of the annular structure. The open-type clamping ring (32) is made of elastic material, so that it is convenient for a worker to clamp the open-type clamping ring (32) onto the two three-level stepped connecting sleeves (31); The left and right sides of the open clamp (32) are symmetrical two-level stepped groove structures, and the outer surface of the three-level stepped connecting sleeve (31) is a stepped structure. When the open clamp (32) is clamped on the three-level stepped connecting sleeve (31), the two-level stepped groove structure inside the open clamp (32) and the outer surface of the three-level stepped connecting sleeve (31) are matched with the circumferential part of the insulation layer and the shielding layer leaking out of the short cable 1 (1) and the short cable 2 (2).

3. A concentric cable according to claim 2, characterized in that: The number of the clamping blocks (321) is three and they are distributed at 90-degree intervals, and the middle clamping block (321) is arranged directly opposite the opening of the open clamp ring (32).

4. A concentric cable according to claim 1, characterized in that: The minimum straight-line distance between the inner annular surface of the second annular plate (333) and the axis of the coaxial cable is greater than the minimum straight-line distance between the first extrusion block (335) and the second extrusion block (337) and the axis of the coaxial cable.

5. A concentric cable according to claim 4, characterized in that: The annular block 2 (336), the extrusion block 2 (337), the annular block 1 (334) and the extrusion block 1 (335) are all made of rubber.

6. A concentric cable according to claim 4, characterized in that: The inclined surface where the annular block 2 (336) contacts the extrusion block 2 (337) and the inclined surface where the annular block 1 (334) contacts the extrusion block 1 (335) are both evenly rotated and equipped with balls.

7. A concentric cable according to claim 3, characterized in that: After the short cable 1 (1) and the short cable 2 (2) are butt-jointed, the distance between the sides of the two clamping grooves symmetrically arranged in the two three-level stepped connection sleeves (31) close to each other is greater than the distance between the sides of the two clamping blocks (321) symmetrically distributed in the two axial directions close to each other; The two sides of the two axially symmetrically distributed clamping blocks (321) close to each other are both inclined structures inclined from top to bottom in a direction away from the center conductor, and the corresponding clamping groove is provided with an inclined surface that matches the inclined surface structure of the clamping block (321) and has the same inclined direction.

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