Cable gas leakage detection test system and test method thereof

Abstract

The invention relates to a cable gas leakage detection test system and a test method thereof. The first pressure unit comprises a first pressure tank body, a first end cover, a first split conical sleeve and a first pressing piece; the first split conical sleeve comprises two first semi-cones, a first clamping hole is formed between the two first semi-cones, and one end of a tested cable extends into the first pressure tank body; the second pressure unit comprises a second pressure tank body, a second end cover, a second split conical sleeve, a second pressing piece and a pressure detection device; the second split conical sleeve comprises two second semi-cones, a second clamping hole is formed between the two second semi-cones, and the other end of the tested cable extends into the second pressure tank body; and the vacuumizing unit comprises a transmission air pipe, a vacuum pump mechanism and a real-time pressure value display device. The method can improve the detection precision, and has the advantages of convenient operation, low cost and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable detection, in particular to a cable gas leak detection test system and a test method thereof. BACKGROUND

[0002] With the rapid development of information society, data transmission has become an important part of modern social infrastructure. Whether in the 5G communication, "East Data West Algorithm" and other projects, or in the field of artificial intelligence, big data and digital economy, cable (optical cable, electrical cable, etc.) as the carrier of data transmission, its transmission quality and stability are directly related to the safety and reliability of the system. Therefore, the detection of performance indicators during cable manufacturing, especially the detection of air tightness, has become a key link for cable manufacturing enterprises to improve product quality and meet high-standard application scenarios.

[0003] The existing cable air tightness detection method mainly uses water immersion leak detection method, that is, one end of the cable to be tested is sealed, the other end is connected to compressed air, the cable is immersed in water, and the presence or absence of bubbles is observed to determine the air tightness of the cable.

[0004] However, this method consumes a lot of water resources during detection, and requires sealing of the test cable by glue, which increases the detection cost and is poor in environmental protection; and relies on manual observation of bubbles, which is highly subjective and has limited detection sensitivity, and some small leaks are difficult to be detected in time. SUMMARY

[0005] Therefore, the present application provides a cable gas leak detection test system and a test method thereof, which can improve detection accuracy and has the advantages of convenient operation, low cost and the like, and meets the current quality control requirements of high-performance cable products.

[0006] To solve the above technical problems, the present application provides a cable gas leak detection test system, comprising: A first pressure unit comprises a first pressure tank body, a first end cover, a first split conical sleeve and a first pressing member. The first end cover cooperates with the open end of the first pressure tank body, and a first conical hole is formed therein, which extends into the first pressure tank body and is suitable for sealing cooperation with the first split conical sleeve. The first pressing member cooperates with the first end cover and can press the first split conical sleeve into the first conical hole. The first conical hole is constricted in the direction away from the first pressing member. The first split conical sleeve comprises two first half-cones, and a first clamping hole suitable for clamping the measured cable is formed between the two first half-cones. One end of the measured cable extends into the first pressure tank body. The first end cover is provided with a first air inlet valve. The second pressure unit comprises a second pressure tank body, a second end cover, a second split conical sleeve, a second pressing member and a pressure detection device; the second end cover is matched with the opening end of the second pressure tank body and is provided with a second conical hole extending into the second pressure tank body and being suitable for being sealingly matched with the second split conical sleeve; the second pressing member is matched with the second end cover and can press the second split conical sleeve into the second conical hole; the second conical hole is in a contracting shape along the direction away from the second pressing member; the second split conical sleeve comprises two second half-cones, and a second clamping hole suitable for clamping the measured cable is formed between the two second half-cones; the other end of the measured cable extends into the second pressure tank body; the pressure detection device is used for acquiring the pressure value in the second pressure tank body; and the second end cover is provided with a second air inlet valve. The vacuumizing unit comprises a transmission air pipe, a vacuum pump mechanism and a real-time pressure value display device; the air port of the vacuum pump mechanism is connected with the second air inlet valve through the transmission air pipe; and the real-time pressure value display device is used for displaying the real-time pressure and the set target pressure value.

[0007] In an embodiment of the present application, the first end cover is provided with a first threaded hole communicated with the first conical hole; the first pressing member comprises a first columnar body, a first through hole suitable for the measured cable extending into is axially formed along the first columnar body, the first columnar body is provided with external threads threadedly matched with the first threaded hole, and a first pressing protrusion used for abutting against the end of the first split conical sleeve is arranged at one end of the first columnar body facing the first split conical sleeve. The second end cover is provided with a second threaded hole communicated with the second conical hole; the second pressing member comprises a second columnar body, a second through hole suitable for the measured cable extending into is axially formed along the second columnar body, the second columnar body is provided with external threads threadedly matched with the second threaded hole, and a second pressing protrusion used for abutting against the end of the second split conical sleeve is arranged at one end of the second columnar body facing the second split conical sleeve.

[0008] In an embodiment of the present application, a first pressing step is arranged along the radial direction of the first columnar body, and a first pressing pad is arranged between the first pressing step and the first end cover. A second pressing step is arranged along the radial direction of the second columnar body, and a second pressing pad is arranged between the second pressing step and the second end cover.

[0009] In an embodiment of the present application, the first pressing member and the second pressing member each comprise a first split body and a second split body, a threaded connecting hole is formed along the radial direction of the first split body, and a connecting through hole matched with the threaded connecting hole is formed along the radial direction of the second split body.

[0010] In an embodiment of the present application, the taper of the first or second split conical sleeve is 12°±2°, and the large diameter end of the first or second split conical sleeve and the two ends of the first or second through hole are respectively provided with a circular chamfer.

[0011] In an embodiment of the present application, the pressure detection device is a digital vacuum pressure gauge arranged on the second end cover.

[0012] In an embodiment of the present application, the opening end of the first pressure tank body and the first end cover and the opening end of the second pressure tank body and the second end cover are connected by fasteners.

[0013] In an embodiment of the present application, the opening end of the first pressure tank body and the first end cover and the opening end of the second pressure tank body and the second end cover are provided with tank body sealing pads.

[0014] In an embodiment of the present application, the first pressure tank body is further provided with a first exhaust valve, and the second pressure tank body is further provided with a second exhaust valve.

[0015] The present application also provides a cable gas leak detection test method using the cable gas leak detection test system, the method comprising: The two ends of the cable to be tested are respectively threaded through the first and second split conical sleeves, so that one end of the cable to be tested extends into the first pressure tank body and the other end extends into the second pressure tank body; the first split conical sleeve is pressed into the first conical hole of the first end cover by the first pressing member, and the second split conical sleeve is pressed into the second conical hole of the second end cover by the second pressing member, so that the first split conical sleeve and the first conical hole and the second split conical sleeve and the second conical hole form a sealed fit, and the first and second split conical sleeves achieve sealed clamping of the cable to be tested; The second air inlet valve is opened, the target negative pressure value of the vacuum pumping unit is set, and one of the first and second pressure tank bodies is subjected to negative pressure pumping by the vacuum pumping unit until the pressure value of the pressure detection device is consistent with the target negative pressure value; The second air inlet valve is closed, and the first air inlet valve is in a closed state. The pressure value displayed by the pressure detection device is continuously observed, and if the pressure value changes within the preset change threshold value within the set detection period, it is determined that the gas tightness of the cable to be tested is qualified; if the pressure value changes exceeds the preset change threshold value, it is determined that the cable to be tested has a leak and the gas tightness is unqualified.

[0016] The above technical solutions of the present application have the following advantages compared with the prior art: The cable gas leakage detection test system and the test method thereof have the following advantages: the double-end pressure tank and the vacuum pump mechanism are adopted, the high-precision monitoring of pressure change and the negative pressure control are realized through the pressure detection device (digital vacuum pressure gauge) and the real-time pressure display device, the pressure precision adjustment in the range of 0.09 MPa±0.5% can be realized, the sensitivity and accuracy of the cable airtightness detection are effectively improved, the real-time pressure data monitoring can timely and accurately determine the small leakage inside the cable, and the problem of insufficient sensitivity of the traditional visual leakage detection method is solved, compared with the traditional visual method of water immersion, the pressure value monitoring is more stable, and the detection result is more reliable.

[0017] The cable end does not need to be immersed in water, the consumption of water resources is reduced, the split cone sleeve is reusable, the sealing is reliable, the cable end does not need to be sealed by glue, the use of sealing glue is significantly reduced, and the method is more green and environmentally friendly.

[0018] After the first through hole and the second through hole are passed through the ends of the cable to be detected, the first cylindrical body or the second cylindrical body is moved in the axial direction by rotating the threads, the first compression protrusion or the second compression protrusion drives the end of the corresponding first split conical sleeve or the second split conical sleeve to abut, and the first split conical sleeve or the second split conical sleeve is pushed to move in the direction of the first conical hole or the second conical hole. With the cooperation between the conical surfaces, the first split conical sleeve or the second split conical sleeve is tightly fitted with the respective conical hole to form an effective seal. At the same time, the first clamping hole and the second clamping hole are radially contracted under the action of the conical surface, and reliable sealing and clamping of the two ends of the cable to be detected are realized. The structure not only simplifies the clamping process of the cable, but also significantly improves the sealing performance. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to make the content of the present application more easily understood, the present application will be further described in detail below according to specific embodiments of the present application and in conjunction with the drawings.

[0020] Figure 1 is a schematic diagram of the overall structure of the cable gas leakage detection test system of the present application.

[0021] Figure 2 is a schematic diagram of the structure of the first pressure unit of the present application.

[0022] Figure 3 is a schematic diagram of the structure of the second pressure unit of the present application.

[0023] Figure 4 is a schematic diagram of the structure of the vacuum unit of the present application.

[0024] Figure 5is a structural schematic diagram of the first half-cone or the first half-cone of the present application.

[0025] Figure 6 is a structural schematic diagram of the first half-cone or the first half-cone of the present application.

[0026] Figure 7 is a structural schematic diagram of the first half-cone or the first half-cone of the present application.

[0027] Figure 8 is a structural schematic diagram of the first half-cone or the first half-cone of the present application.

[0028] Figure 9 is Figure 8 is a sectional view along the direction of A-A.

[0029] Figure 10 is a structural schematic diagram of the first half-cone or the first half-cone of the present application.

[0030] Figure 11 is Figure 10 is a sectional view along the direction of A-A.

[0031] Description of the Drawings: 1, first pressure unit; 11, first pressure tank body; 12, first end cover; 13, first split conical sleeve; 131, first half-cone; 132, first clamping hole; 14, first pressing member; 141, first cylindrical body; 1411, first split body; 1412, second split body; 1413, threaded connection hole; 1414, connection through hole; 142, first through hole; 143, first pressing protrusion; 144, first pressing step; 145, first pressing pad; 16, first exhaust valve; 17, fastener; 18, tank body sealing pad; 19, first air inlet valve; 2, second pressure unit; 21, second pressure tank body; 22, second end cover; 23, second split conical sleeve; 231, second half-cone; 232, second clamping hole; 24, second pressing member; 241, second cylindrical body; 242, second through hole; 243, second pressing protrusion; 244, second pressing step; 245, second pressing pad; 25, pressure detection device; 26, second exhaust valve; 29, second air inlet valve; 3, vacuum pumping unit; 31, transmission air pipe; 32, vacuum pump mechanism; 33, real-time pressure value display device; 4, measured cable. DETAILED DESCRIPTION

[0032] The present application will be further described below in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present application and implement it, but the embodiments are not limiting to the present application.

[0033] In the present application, if the direction (up, down, left, right, front and back) is described, it is only for the convenience of describing the technical solutions of the present application, and is not intended to indicate or imply that the technical features referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0034] In the present application, the meaning of "several" is one or more, the meaning of "multiple" is two or more, and "greater than", "less than", "more than" and the like are understood as not including the number; "above", "below", "within" and the like are understood as including the number. In the description of the present application, if "first" and "second" are described, they are only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0035] In the present application, unless otherwise explicitly limited, the words "set", "install", "connect" and the like should be broadly understood, for example, they can be directly connected, or indirectly connected through an intermediate medium; can be fixedly connected, or can be detachably connected, or can be integrally formed; can be mechanically connected, or can be electrically connected or capable of communicating with each other; can be the communication or interaction relationship between two elements. The skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solutions.

[0036] Referring to Figures 1 to 6 The embodiment provides a cable gas leak detection test system, which comprises: A first pressure unit 1 comprises a first pressure tank body 11, a first end cover 12, a first split body 1411 conical sleeve 13 and a first pressing member 14. The first end cover 12 is matched with the opening end of the first pressure tank body 11, and a first conical hole extending into the first pressure tank body 11 and suitable for sealing cooperation with the first split body 1411 conical sleeve 13 is formed. The first pressing member 14 is matched with the first end cover 12 and can press the first split body 1411 conical sleeve 13 into the first conical hole. The first conical hole is contracted in the direction away from the first pressing member 14. The first split body 1411 conical sleeve 13 comprises two first half-cones 131, and a first clamping hole 132 suitable for clamping the measured cable 4 is formed between the two first half-cones 131. One end of the measured cable 4 extends into the first pressure tank body 11. The first pressure detection device 15 is used to obtain the pressure value in the first pressure tank body 11. The first end cover 12 is provided with a first air inlet valve 19. The second pressure unit 2 comprises a second pressure tank body 21, a second end cover 22, a second split conical sleeve 23, a second pressing member 24 and a pressure detection device 25. The second end cover 22 is matched with the open end of the second pressure tank body 21 and is provided with a second conical hole extending into the second pressure tank body 21 and being adapted to be sealingly matched with the second split conical sleeve 23. The second pressing member 24 is matched with the second end cover 22 and can press the second split conical sleeve 23 into the second conical hole. The second conical hole is contracted in the direction away from the second pressing member 24. The second split conical sleeve 23 comprises two second half-cones 231, and a second clamping hole 232 adapted to clamp the measured cable 4 is formed between the two second half-cones 231. The other end of the measured cable 4 extends into the second pressure tank body 21. The pressure detection device 25 is used to obtain the pressure value in the second pressure tank body 21. The second end cover 22 is provided with a second air inlet valve 29. The vacuumizing unit 3 comprises a transmission air pipe 31 and a vacuum pump mechanism 32. The air port of the vacuum pump mechanism 32 is connected with the second air inlet valve 29 through the transmission air pipe 31. A real-time pressure value display device 33 is used to display the real-time pressure and the set target pressure value.

[0037] The first split 1411 conical sleeve 13 and the second split conical sleeve 23 are pressed into the first conical hole and the second conical hole by the first pressing member 14 and the second pressing member 24, so that a stable and efficient sealing interface can be formed to avoid pressure leakage and ensure the detection accuracy. The first split 1411 conical sleeve 13 and the second split conical sleeve 23 adopt a two-half-cone structure, which is convenient to disassemble and assemble and is suitable for cables of different specifications. The overall design is compact and has strong sealing performance, which effectively improves the detection accuracy and reliability. The air port of the vacuum pump mechanism 32 is connected with the second air inlet valve 29 through the transmission air pipe 31, so that the negative pressure air suction of the second pressure tank body 21 can be realized. The real-time pressure value display device 33 (pressure value display) is helpful to accurately control the negative pressure state in the vacuumizing process and improves the detection sensitivity and the controllability of data.

[0038] It should be noted that the diameters of the first clamping hole 132 and the second clamping hole 232 are slightly smaller than the diameter of the measured cable 4.

[0039] Specifically, the vacuum pump mechanism 32 can realize the pressure control in the range of 0.09Mpa±0.5% negative pressure, and the real-time pressure value display device 33 has the function of real-time pressure display. The first pressure tank body 11 and the second pressure tank body 21 are made of aluminum alloy material, which ensures the strength while reducing the weight, and also improves the corrosion resistance and service life of the equipment.

[0040] Specifically, referring to Figure 7As shown, the first end cover 12 is provided with a first threaded hole in communication with the first tapered hole, the first pressing member 14 comprises a first cylindrical body 141, a first through hole 142 adapted for the measured cable 4 to extend into is axially formed along the first cylindrical body 141, the first cylindrical body 141 is provided with external threads in threaded cooperation with the first threaded hole, and the first cylindrical body 141 is provided with a first pressing protrusion 143 at one end thereof towards the first part 1411 tapered sleeve 13 for abutting against the end of the first part 1411 tapered sleeve 13.

[0041] The second end cover 22 is provided with a second threaded hole in communication with the second tapered hole, the second pressing member 24 comprises a second cylindrical body 241, a second through hole 242 adapted for the measured cable 4 to extend into is axially formed along the second cylindrical body 241, the second cylindrical body 241 is provided with external threads in threaded cooperation with the second threaded hole, and the second cylindrical body 241 is provided with a second pressing protrusion 243 at one end thereof towards the second part tapered sleeve 23 for abutting against the end of the second part tapered sleeve 23.

[0042] After the two ends of the measured cable 4 pass through the first through hole 142 and the second through hole 242, the first cylindrical body 141 or the second cylindrical body 241 is moved axially by screwing the threads, the first pressing protrusion 143 or the second pressing protrusion 243 is abutted against the end of the first part 1411 tapered sleeve 13 or the second part tapered sleeve 23, and the first part 1411 tapered sleeve 13 or the second part tapered sleeve 23 is pushed to move in the direction of the first tapered hole or the second tapered hole. With the cooperation of the tapered surfaces, the first part 1411 tapered sleeve 13 or the second part tapered sleeve 23 is tightly fitted with the respective tapered hole to form an effective seal. At the same time, the first clamping hole 132 and the second clamping hole 232 are radially contracted under the action of the tapered surface cooperation, realizing reliable sealing and clamping of the two ends of the measured cable 4. This structure not only simplifies the clamping process of the cable, but also significantly improves the sealing performance.

[0043] In one embodiment, with reference to Figures 8 to 11 As shown, the first pressing member 14 and the second pressing member 24 each comprise a first part 1411 and a second part 1412, a threaded connection hole 1413 is radially formed along the first part 1411, a connection through hole 1414 matched with the threaded connection hole 1413 is radially formed along the second part 1412, and the two are connected by a screw rod. The use of a split structure facilitates disassembly and assembly of the assembly, improving the maintenance convenience and use flexibility of the device.

[0044] In one embodiment, the taper of the first part 1411 conical sleeve 13 or the second part conical sleeve 23 is 12°±2° respectively, and the large diameter end of the first part 1411 conical sleeve 13 or the second part conical sleeve 23 is provided with a circular chamfer, and the two ends of the first through hole 142 and the second through hole 242 are respectively provided with a circular chamfer. The conical sleeve is designed with a taper of 12°±2°, which can produce a better sealing effect during compression, improve the reliability and sealing performance of the cable clamping, and ensure the accuracy of the pressure test; the large diameter end is provided with a circular chamfer to prevent scratching and conical hole, and the two ends of the first through hole and the second through hole are provided with a circular chamfer, which further optimizes the smoothness of the cable access channel, prevents the cable skin from being scratched or damaged, and improves the safety of the test process and the service life of the equipment.

[0045] Specifically, referring to Figure 7 , the first compression protrusion 143 and the second compression protrusion 243 are spherical, which enhances the compression reliability.

[0046] Specifically, a first compression step 144 is arranged radially along the first cylindrical body 141, and a first compression pad 145 is arranged between the first compression step 144 and the first end cover 12; a second compression step 244 is arranged radially along the second cylindrical body 241, and a second compression pad 245 is arranged between the second compression step 244 and the second end cover 22, which further enhances the compression reliability.

[0047] Specifically, the pressure detection device 25 is a digital vacuum pressure gauge arranged on the second end cover 22.

[0048] Specifically, referring to Figure 2 , Figure 3 , the opening end (flange) of the first pressure tank body 11 and the first end cover 12, and the opening end (flange) of the second pressure tank body 21 and the second end cover 22 are connected by fasteners 17 (such as hexagonal screws) respectively. The opening end of the first pressure tank body 11 and the first end cover 12, and the opening end of the second pressure tank body 21 and the second end cover 22 are provided with tank body sealing pads 18.

[0049] Specifically, referring to Figure 2 , Figure 3 , the first pressure tank body 11 is further provided with a first exhaust valve 16, and the second pressure tank body 21 is further provided with a second exhaust valve 26. It is convenient to detect the pressure release and adjustment of the front and rear systems, and improve the operation safety and the ease of use of the system.

[0050] The embodiment also provides a cable gas leak detection test method, which utilizes the cable gas leak detection test system, and the method comprises the following steps: S1, the two ends of the measured cable 4 are respectively threaded through the first split body 1411 conical sleeve 13 and the second split body conical sleeve 23, so that one end of the measured cable 4 extends into the first pressure tank body 11 and the other end extends into the second pressure tank body 21; the first split body 1411 conical sleeve 13 is pressed into the first conical hole of the first end cover 12 by the first pressing member 14, and the second split body conical sleeve 23 is pressed into the second conical hole of the second end cover 22 by the second pressing member 24, so that the first split body 1411 conical sleeve 13 and the first conical hole, the second split body conical sleeve 23 and the second conical hole form a sealed fit, and the first split body 1411 conical sleeve 13 and the second split body conical sleeve 23 realize sealed clamping of the measured cable 4; S2, open the second air inlet valve 29, set the target negative pressure value of the vacuum unit 3 according to the test requirement, and perform negative pressure air extraction on the second pressure tank body 21 through the vacuum unit 3 until the pressure value of the pressure detection device 25 is consistent with the target negative pressure value. Specifically, the vacuum pump mechanism 32 is started, the pressure in the second pressure tank body 21 is gradually reduced, and the real-time pressure value display device 33 and the pressure detection device 25 monitor the pressure change in real time. Continue to extract air until the pressure value displayed by the second pressure detection device 25 is consistent with the target pressure value set by the real-time pressure value display device 33.

[0051] S3, close the second air inlet valve 29, at this time the first air inlet valve 19 is in a closed state, and a certain air is filled into the first pressure tank body 11 through the first air inlet valve 19, so that the first pressure tank body 11 has a certain pressure (or normal pressure); S4, continuously observe the pressure value displayed by the pressure detection device 25, if the pressure value changes within the preset change threshold value within the set detection period, it is determined that the air tightness of the measured cable 4 is qualified; if the pressure value changes exceeds the preset change threshold value, it is determined that the measured cable 4 has leakage and the air tightness is unqualified.

[0052] It should be noted that the measured cable 4 generally includes a transmission body (containing optical fiber or copper core), an insulation layer, a shielding layer, a protective layer, etc. There are gaps between the wire conductor, the insulation layer, the shielding layer, and the protective layer / insulation layer. In order to ensure air tightness, the measured cable 4 is filled with sealing wax or fiber paste between the gaps of each layer to meet the sealing requirements. The test system can test whether the sealing treatment can block the flow of gas from the gap. If the air tightness is poor, the gas will flow from the first pressure tank body 11 to the second pressure tank body 21. If the sealing treatment is qualified, the air in the first pressure tank body 11 will not flow into the second pressure tank body 21 from the end of the cable. Therefore, if the negative pressure in the second pressure tank body 21 where the end of the measured cable 4 is located changes, whether the leak is at the head or the middle, as long as the negative pressure in the tank where the end is located changes, it is determined that the air tightness is unqualified.

[0053] In addition, by sealing the two ends of the measured cable 4 in the first pressure tank body 11 and the second pressure tank body 21 respectively and stripping the two ends, the second pressure tank body 21 is evacuated, and the first pressure tank body 11 has a certain pressure (or normal pressure) inside. After the second pressure tank body 21 is evacuated, at this time, one end of the measured cable 4 is in a negative pressure (vacuum) environment, and the other end is sealed in a normal pressure environment. If the measured cable 4 has a leak, the air at normal pressure (pressure) can flow through the internal gap of the measured cable 4 and enter the negative pressure side through the cable opening end, causing the pressure in the second pressure tank body 21 to rise, and causing the value of the pressure detection device 25 to change, thereby realizing the detection of the air tightness of the cable.

[0054] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to examples, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A cable gas leak detection test system, characterized in that: include: The first pressure unit (1) comprises a first pressure tank body (11), a first end cover (12), a first split body (1411) conical sleeve (13), and a first pressing member (14); wherein the first end cover (12) cooperates with the open end of the first pressure tank body (11) and is provided with a first conical hole extending into the first pressure tank body (11) and suitable for sealing with the first split body (1411) conical sleeve (13); the first pressing member (14) cooperates with the first end cover (12) and is capable of pressing the first split body (1411) The (1411) conical sleeve (13) is pressed into the first conical hole, and the first conical hole is contracted in a direction away from the first pressing member (14). The first split (1411) conical sleeve (13) includes two first semi-conical bodies (131). A first clamping hole (132) suitable for clamping the measured cable (4) is formed between the two first semi-conical bodies (131). One end of the measured cable (4) extends into the first pressure tank body (11). The first end cover (12) is provided with a first air inlet valve (19); The second pressure unit (2) comprises a second pressure tank body (21), a second end cover (22), a second split conical sleeve (23), a second pressing member (24), and a pressure detection device (25); wherein the second end cover (22) is matched with the open end of the second pressure tank body (21) and has a second conical hole extending into the second pressure tank body (21) and suitable for sealing with the second split conical sleeve (23); the second pressing member (24) is matched with the second end cover (22) and can press the second split conical sleeve (23) against the second pressure tank body (21); In the second conical hole, the second conical hole is contracted in a direction away from the second pressing member (24), the second split conical sleeve (23) includes two second half cones (231), a second clamping hole (232) suitable for clamping the measured cable (4) is formed between the two second half cones (231), the other end of the measured cable (4) extends into the second pressure tank (21), the pressure detection device (25) is used to obtain the pressure value in the second pressure tank (21), and the second end cover (22) is provided with a second air inlet valve (29); The vacuum unit (3) comprises a transmission air pipe (31), a vacuum pump mechanism (32), and a real-time pressure numerical display device (33), wherein the air port of the vacuum pump mechanism (32) is connected to the second air inlet valve (29) via the transmission air pipe (31), and the real-time pressure numerical display device (33) is used to display the real-time pressure and set the target pressure value.

2. A cable gas leak detection test system according to claim 1, characterized in that: The first end cover (12) is provided with a first threaded hole connected to the first tapered hole, the first pressing member (14) includes a first cylindrical body (141), a first through hole (142) suitable for the tested cable (4) to extend into is provided along the axial direction of the first cylindrical body (141), the first cylindrical body (141) is provided with an external thread that is threadably matched with the first threaded hole, and the first cylindrical body (141) is provided with a first pressing protrusion (143) for abutting against the end of the tapered sleeve (13) of the first split body (1411) at one end thereof facing the tapered sleeve (13) of the first split body (1411); The second end cover (22) is provided with a second threaded hole communicating with the second tapered hole. The second pressing member (24) includes a second cylindrical body (241). A second through hole (242) suitable for the tested cable (4) to extend therethrough is provided axially along the second cylindrical body (241). The second cylindrical body (241) is provided with an external thread that is threadably matched with the second threaded hole. An end of the second cylindrical body (241) facing the second split tapered sleeve (23) is provided with a second pressing protrusion (243) for abutting against an end of the second split tapered sleeve (23).

3. A cable gas leak detection test system according to claim 2, characterized in that: A first pressing step (144) is provided radially along the first cylindrical body (141), and a first pressing pad (145) is provided between the first pressing step (144) and the first end cover (12); A second pressing step (244) is provided radially along the second cylindrical body (241), and a second pressing pad (245) is provided between the second pressing step (244) and the second end cover (22).

4. A cable gas leak detection test system according to claim 2, characterized in that: The first pressing member (14) and the second pressing member (24) both comprise a first split body (1411) and a second split body (1412), wherein a threaded connection hole (1413) is provided along the radial direction of the first split body (1411), and a connecting through hole (1414) cooperating with the threaded connection hole (1413) is provided along the radial direction of the second split body (1412).

5. A cable gas leak detection test system according to claim 1, characterized in that: The taper of the first split (1411) tapered sleeve (13) or the second split tapered sleeve (23) is 12°±2°, respectively. The large-diameter ends of the first split (1411) tapered sleeve (13) and the second split tapered sleeve (23) and both ends of the first through hole (142) and the second through hole (242) are respectively provided with circular chamfers.

6. A cable gas leak detection test system according to claim 1, characterized in that: The pressure detection device (25) is a digital vacuum pressure gauge provided on the second end cover (22).

7. A cable gas leak detection test system according to claim 1, characterized in that: The open end of the first pressure tank body (11) and the first end cover (12), and the open end of the second pressure tank body (21) and the second end cover (22) are respectively connected via fasteners (17).

8. A cable gas leak detection test system according to claim 1, characterized in that: A tank body sealing gasket (18) is provided between the open end of the first pressure tank body (11) and the first end cover (12), and between the open end of the second pressure tank body (21) and the second end cover (22).

9. A cable gas leak detection test system according to claim 1, characterized in that: The first pressure tank body (11) is further provided with a first exhaust valve (16), and the second pressure tank body (21) is further provided with a second exhaust valve (26).

10. A cable gas leak detection test method, characterized in that: Utilizing the cable gas leak detection test system according to any one of claims 1 to 8, the method comprises: Passing the two ends of the tested cable (4) through the first split (1411) conical sleeve (13) and the second split conical sleeve (23) respectively, so that one end of the tested cable (4) extends into the first pressure tank body (11) and the other end extends into the second pressure tank body (21); pressing the first split (1411) conical sleeve (13) into the first conical hole of the first end cover (12) through the first pressing member (14), and pressing the second split conical sleeve (23) into the second conical hole of the second end cover (22) through the second pressing member (24), so that a sealing fit is formed between the first split (1411) conical sleeve (13) and the first conical hole, and between the second split conical sleeve (23) and the second conical hole, and the first split (1411) conical sleeve (13) and the second split conical sleeve (23) achieve a sealing clamping of the tested cable (4); Opening the second air inlet valve (29), setting a target negative pressure value of the vacuum unit (3), and performing negative pressure extraction on the second pressure tank (21) through the vacuum unit (3) until the pressure value of the pressure detection device (25) is consistent with the target negative pressure value; The second air inlet valve (29) is closed, and the first air inlet valve (19) is now in a closed state; The pressure value displayed by the pressure detection device (25) is continuously observed. If the pressure value changes within a preset change threshold within a set detection period, the air tightness of the tested cable (4) is determined to be qualified; if the pressure value changes beyond the preset change threshold, the tested cable (4) is determined to have a leak and the air tightness is unqualified.

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