Portable testing tool for communication circuit cable

Abstract

The invention belongs to the technical field of power equipment, and particularly discloses a communication circuit cable portable test tool which comprises a light emitting diode indicator light, a protective shell, an adjusting cylinder, a terminal interface and at least two clamping blocks, the top of the adjusting cylinder is in vertical sliding fit with the protective shell, and the terminal interface is in vertical sliding fit with the adjusting cylinder. Inclined surfaces are arranged at the bottoms of the adjusting cylinders; the terminal interface is connected with a central conductor, the top of the terminal interface is connected with a supporting tube, and the top of the supporting tube is connected with the top wall of the protective shell; the anode and the cathode of the light-emitting diode indicating lamp are respectively connected with the anode and the cathode of the terminal interface. The clamping block is hinged to the outer side of the terminal interface, the top of the clamping block is provided with a wedge surface, and a first spring is connected between the clamping block and the terminal interface; the adjusting cylinder slides downwards to drive the lower portion of the clamping block to swing inwards, and a limiting unit is arranged between the adjusting cylinder and the protective shell. The cable testing device can adapt to testing of different types of cables.

Description

Technical Field

[0001] This invention relates to the field of power equipment technology, and more specifically to a portable testing tool for communication circuit cables. Background Technology

[0002] As the nerve center of electrical products in fields such as power, communications, and manufacturing, cables directly determine the operational safety and overall quality of equipment through their insulation performance and conductivity stability. Short-circuit faults are among the most common failure modes of cables, potentially leading not only to equipment burnout and production line shutdowns, but also to major safety accidents such as fires and explosions. Therefore, rapid and accurate detection of cable short circuits during equipment factory testing, on-site installation and commissioning, and operation and maintenance has become a core aspect of ensuring industrial safety. Currently, the mainstream method for cable short-circuit testing in the industry still relies on multimeters: during testing, operators need to use the probes to touch the conductors and insulation layers at both ends of the cable connector, and determine whether a short circuit exists by measuring the resistance value. This traditional method has two major fatal flaws: first, it is limited by distance. For scenarios such as buried cables and multi-story wiring, if the distance between the two ends exceeds the length of the multimeter test leads, testing cannot be completed, and troubleshooting short circuit faults in such concealed wiring is already extremely difficult; second, it is cumbersome to operate, requiring repeated adjustments of the probe contact positions, resulting in low efficiency for single-person operation and a high risk of misjudgment due to poor contact. To address the aforementioned issues, existing technology discloses a rapid testing instrument for 2M cable channels and its usage method, disclosed in CN114545291A. This instrument includes a terminal interface, an LED indicator light, an insulating protective tube, and a crimping tube. The signal input pin of the LED indicator light is inserted into the insulating protective tube. One signal input pin of the LED indicator light is connected to the positive terminal of the terminal interface. The other signal input pin of the LED indicator light is inserted into the crimping tube, and the crimping tube is securely connected to the negative terminal of the terminal interface. This testing instrument achieves portable testing through its terminal interface and LED indicator light structure, and is not limited by cable length. However, in practical applications, this solution has the following drawbacks: The connectors at the cable ends need to connect to the terminals on the patch panel. However, patch panels for different purposes have completely different terminal sizes, determined by the signal types they accommodate and the specifications of the cables and cable connectors. Cable connector specifications vary significantly depending on the application scenario. The terminal interface of this tester only matches cable connectors or patch panel terminals (ports) of a single size; it cannot cover the testing needs of multiple cable types, while industrial scenarios often require troubleshooting multiple types of cables. These shortcomings make this solution unable to meet the needs of multi-specification, multi-scenario, and high-efficiency short-circuit testing in power maintenance, intelligent manufacturing, and other scenarios. Therefore, there is an urgent need for a universal testing tool that can adapt to different connector specifications. Summary of the Invention

[0003] This invention provides a portable testing tool for communication circuit cables, which is designed to be compatible with the testing of different types of cables.

[0004] The present invention is achieved through the following technical solution: a portable testing tool for communication circuit cables, including a light-emitting diode indicator light and a protective shell, wherein the light-emitting diode indicator light is press-fitted to the end of the protective shell, and further includes an adjusting cylinder, a terminal interface and at least two clamping blocks, wherein the top of the adjusting cylinder is vertically slidably engaged with the protective shell, the terminal interface is located inside the adjusting cylinder and is vertically slidably engaged with the adjusting cylinder, and the bottom of the adjusting cylinder is provided with a slope. A central conductor is connected to the terminal interface, and a support tube is connected to the top of the terminal interface. The central conductor is located inside the support tube, and the top of the support tube is connected to the top wall of the protective shell. The positive and negative terminals of the LED indicator are connected to the positive and negative terminals of the terminal interface, respectively. The clamping block is hinged to the outside of the terminal interface, the top of the clamping block is provided with a wedge surface that cooperates with the inclined surface of the bottom of the adjusting cylinder, and a first spring is connected between the clamping block and the terminal interface; The downward sliding of the adjusting cylinder can drive the lower part of the clamping block to swing inward, and a limiting unit for locking the position of the adjusting cylinder is provided between the adjusting cylinder and the protective shell.

[0005] Compared with existing technologies, this solution has the following advantages and beneficial effects: In this solution, the inclined-wedge surface of the adjusting cylinder and the clamping block are matched. By sliding the adjusting cylinder downward, the lower part of the clamping block can be driven to swing inward. With the reset action of the first spring, the clamping distance can be flexibly adjusted. It can cover various specifications such as L9 connector (about 9mm in diameter), BNC connector (about 6mm in diameter), and CC4 connector (about 4mm in diameter). There is no need to change the interface of the test tool. It solves the problem that traditional multimeters need to frequently adjust the test leads or the tester can only be adapted to a single terminal. It can be adapted to the testing of different types of cables. When the clamping block swings inward, it can form a uniform clamping force on connectors or terminals of different sizes, avoiding poor contact caused by differences in connector size; at the same time, the vertical sliding fit between the terminal interface and the adjusting cylinder can automatically fine-tune the position according to the insertion depth of the connector, ensuring that the center conductor and the conductive end of the connector are accurately connected, effectively reducing the misjudgment rate (such as avoiding misjudgment of "short circuit" or "open circuit" due to contact deviation). This solution eliminates the need to hold the probes with both hands to contact both ends of the connector, unlike a multimeter. Simply insert the clamping block onto the outside of the connector or patch panel terminal and slide the adjusting cylinder downwards to clamp and fix it. The bottom of the center conductor of the terminal interface contacts and connects with the conductor on the connector or terminal. At the same time, the LED indicator directly displays the test result (if the light is on, the circuit is normal; if the light is off or flashing, the circuit is short-circuited / open-circuited). A single person can complete the test of a single cable in a short time, which effectively improves efficiency compared to traditional methods.

[0006] In addition, the limiting unit between the adjusting cylinder and the protective shell in this solution can lock the position of the adjusting cylinder. After clamping, the clamping block will not loosen due to external factors such as vibration, thereby ensuring the tightness of the entire testing tool and preventing the testing tool from loosening and falling off during testing. At the same time, it is compatible with the loose gap of the aging interface, thereby ensuring stable contact during the testing process and ensuring the accuracy of the test results.

[0007] In this design, the protective casing encloses the LED indicator and the central conductor, while the support tube isolates the central conductor from the external structure. This prevents operators from accidentally touching conductive parts during testing and also prevents dust and moisture from entering the internal circuitry, thus improving safety.

[0008] In this design, the support tube is positioned between the terminal interface and the protective housing. The terminal interface connects to the terminal on the wiring harness or the connector end on the cable. When the adjusting cylinder slides downwards, the support tube ensures the stability of the protective housing and prevents it from sliding downwards with the adjusting cylinder due to gravity. This allows the limiting unit to effectively lock the position of the adjusting cylinder, thereby ensuring smooth and stable operation of the entire testing tool.

[0009] Finally, the core components of this solution (protective housing, adjusting cylinder, clamping block) are highly integrated, with an overall volume only half that of a traditional multimeter, allowing operators to carry it with one hand. Unlike multimeters that rely on test lead length, the testing tool in this solution performs the test directly through its own circuitry (the LED indicator light is triggered based on the cable continuity status). Short circuits can be determined by operating only one end, solving the problem of insufficient test lead length in multimeters when testing long-distance cables.

[0010] Furthermore, a support rod is horizontally inserted through the adjusting cylinder, and a movable hole is opened at the upper part of the terminal interface. The support rod passes through the movable hole and can slide vertically within the movable hole.

[0011] Beneficial effects: In this solution, the support rod connects the adjusting cylinder and the terminal interface, preventing them from detaching. In addition, the terminal interface is connected to the protective shell through the support tube, thus making the protective shell, adjusting cylinder and terminal interface a whole, which is easy to carry, and the three will not slide or separate due to gravity during the carrying process.

[0012] Furthermore, a through hole is formed on the support rod, and the central conductor passes through the through hole.

[0013] Beneficial effect: The support rod in this design facilitates the passage of the central conductor, avoiding any obstruction to the central conductor after the support rod is installed.

[0014] Furthermore, multiple clamping blocks are provided, and the multiple clamping blocks are evenly distributed along the circumference of the terminal interface.

[0015] Beneficial effects: This solution uses multiple circumferentially evenly distributed clamping blocks, which, compared to using only two clamping blocks, can generate synchronous clamping force from multiple directions around the connector. For circular connectors (such as L9 and BNC connectors), it can ensure that the center of the connector is precisely aligned with the center of the terminal interface, avoiding connector skewing due to unilateral force, and thus preventing misalignment between the center conductor and the conductive end of the connector. For irregularly shaped connectors (such as some industrial square terminal connectors), multi-directional clamping can adapt to the connector contour, and disperse pressure through multiple contact points, reducing the risk of connector deformation.

[0016] Because multiple clamping blocks form an open clamping entrance along the circumference, operators do not need to deliberately align the direction when inserting the connector. The connector can enter the clamping area from any angle, and the clamping blocks will automatically adapt to the position of the connector and clamp it synchronously, improving insertion efficiency. It is especially suitable for scenarios with limited visibility, such as high altitudes and confined spaces.

[0017] When clamping connectors of different diameters (such as from 4mm CC3 connectors to 9mm L9 connectors), the circumferentially distributed clamping blocks can synchronously retract inward to form an annular clamping space that matches the outer diameter of the connector, thus maintaining the coaxiality of the connector and the terminal interface at all times.

[0018] Furthermore, the bottom of the adjusting cylinder has a beveled edge forming a conical surface, and the wedge surfaces of the multiple clamping blocks are matched with the conical surface of the adjusting cylinder.

[0019] Beneficial effects: The conical surface of the adjusting cylinder in this design can adapt to the wedge surfaces of multiple clamping blocks, forming surface contact with them and avoiding uneven local force due to contact point misalignment. When the adjusting cylinder slides downward, the conical surface can simultaneously apply uniform compressive force to the wedge surfaces of all clamping blocks, ensuring that multiple clamping blocks swing inward synchronously, completely solving the problem of delayed movement of some clamping blocks in traditional single-slope drive.

[0020] Furthermore, the terminal interface has the same number of spring mounting slots as the clamping blocks, and all the spring mounting slots are inclined downwards. One end of the first spring is fixed in the spring mounting slot, and the other end of the first spring is fixed inside the clamping block.

[0021] Beneficial effects: The spring mounting slot provides a mounting position for the first spring. The downward tilt of the spring mounting slot ensures that the direction of the first spring's force is perfectly aligned with the swing direction of the clamping block around the hinge axis. When the conical surface of the adjusting cylinder presses the clamping block inward, the first spring stretches evenly along the tilt direction, avoiding the additional resistance caused by the force direction deviation of traditional horizontal or vertically installed springs. When the adjusting cylinder returns to its original position, the first spring precisely pulls the clamping block outward along the tilt direction. Compared to the jamming that easily occurs when traditional springs return to their original position, this ensures the clamping block quickly returns to its initial open state, facilitating the insertion of the next connector.

[0022] Since the spring mounting slots correspond one-to-one with the clamping blocks, and each first spring is independently installed in its own slot, it can be ensured that the magnitude of the reset force on each clamping block is consistent.

[0023] Furthermore, both the adjusting cylinder and the terminal interface have a convex shape, and the adjusting cylinder has an internal cavity; both the protective shell and the adjusting cylinder have sliding holes in their centers, the central part of the adjusting cylinder slides vertically with the sliding hole of the protective shell, and the central part of the terminal interface slides vertically with the sliding hole of the adjusting cylinder.

[0024] Beneficial effects: In this solution, both the adjusting cylinder and the terminal interface have a convex structure, so that the central part of both protrudes upward, making it easy for the central part of the adjusting cylinder to slide and engage with the sliding hole of the protective shell, while the rest of the adjusting cylinder can easily engage with the terminal interface. The central part of the terminal interface slides and engages with the sliding hole of the adjusting cylinder, while the rest of the terminal interface can easily engage with the clamping block.

[0025] Furthermore, the top wall of the adjusting cylinder is provided with an upper groove, and both sides of the center of the terminal interface are provided with lower grooves that are directly opposite the upper groove. A second spring is provided between the upper groove and the lower groove. The limiting unit includes an adjusting rod and a locking nut. A strip-shaped hole is provided on one side of the protective shell. One end of the adjusting rod is connected to the adjusting cylinder, and the other end of the adjusting rod passes through the strip-shaped hole. The adjusting rod slides vertically with the strip-shaped hole. The locking nut is located outside the strip-shaped hole and is threadedly connected to the adjusting rod.

[0026] Beneficial effects: In this solution, the upper groove on the adjusting cylinder and the lower groove on the terminal interface provide an installation position for the second spring, so that the spring force direction of the second spring is completely consistent with the sliding direction (vertical) of the adjusting cylinder and the terminal interface.

[0027] After the limiting unit is unlocked, the second spring can directly push the adjusting cylinder upwards, assisting the first spring in pulling the clamping block outwards. During the clamping process, the adjusting cylinder will compress the second spring when it slides downwards. The elastic buffering effect of the spring can prevent the adjusting cylinder from directly colliding with the convex structure of the terminal interface. At the same time, the second spring can balance the sliding speed of the adjusting cylinder and the terminal interface, preventing rigid friction between the conical surface of the adjusting cylinder and the wedge surface of the clamping block due to excessive sliding speed.

[0028] The strip-shaped hole on one side of the protective shell provides a vertical sliding channel for the adjusting rod. The adjusting rod is fixedly connected to the adjusting cylinder. The sliding position of the adjusting cylinder can be precisely controlled by moving the adjusting rod up and down, and then locked and fixed by the locking nut. In practice, a scale can be provided on one side of the protective shell. Operators can visually judge the sliding stroke of the adjusting cylinder through the scale, and then estimate the clamping force without relying on experience.

[0029] Furthermore, the limiting unit includes multiple limiting grooves formed inside the sliding hole of the protective shell, a mounting groove disposed on the outside of the adjusting cylinder, and a third spring and a limiting bead disposed in the mounting groove. The multiple limiting grooves are distributed axially at intervals along the sliding hole of the protective shell. The two ends of the third spring are respectively connected to the limiting bead and the mounting groove, and the limiting bead can be inserted into the limiting groove to lock the position of the adjusting cylinder.

[0030] Beneficial effects: This solution provides an alternative structure for the limiting unit. In this solution, multiple limiting grooves are axially spaced on the inner side of the sliding hole of the protective shell. A third spring and a limiting ball are pre-installed in the mounting groove on the outer side of the adjusting cylinder. When the adjusting cylinder slides downward, the limiting ball compresses the third spring under the pressure of the inner wall of the sliding hole. When the adjusting cylinder moves to the position of the limiting groove, the third spring automatically resets and pushes the limiting ball into the limiting groove, realizing one-click completion of sliding and locking. Compared with the traditional operation of adjusting rod + locking nut which requires manual tightening of the nut, the locking efficiency is improved, which is especially suitable for continuous batch testing and greatly reduces the operation intensity. Multiple limiting grooves are distributed in stages along the axial direction, which can accurately match the sliding stroke of the adjusting cylinder according to the diameter of the cable connector. When unlocking, simply pull the adjusting cylinder upwards. The limiting bead is automatically compressed by the inclined surface of the limiting groove and the third spring is released from the groove. No additional pressing or twisting of parts is required. The unlocking-reset action can be completed with one hand.

[0031] Furthermore, the limiting unit is provided in two or more sets, and the two or more sets of the limiting unit are evenly distributed along the circumference of the sliding hole of the protective shell.

[0032] Beneficial effects: Two or more sets of limiting units are evenly distributed along the circumference of the sliding hole, which not only improves the support effect on the adjusting cylinder, but also ensures that the third spring of each limiting unit and the limiting ball are synchronously engaged in the corresponding limiting groove, so that the locking force on the adjusting cylinder is evenly distributed along the circumference. Compared with the problem that the adjusting cylinder is prone to swaying due to the force on one side of a single limiting unit, this ensures that the conical surface of the adjusting cylinder and the wedge surface of the multiple clamping blocks are always fully in contact, avoiding uneven clamping force caused by one-sided locking and reducing the failure rate of joint contact. Attached Figure Description

[0033] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings: Figure 1 This is a longitudinal cross-sectional view of one embodiment of a portable testing tool for communication circuit cables according to the present invention; Figure 2 for Figure 1 A magnified view of a section at point A in the middle; Figure 3 This is a longitudinal cross-sectional view of another embodiment of a portable testing tool for communication circuit cables according to the present invention; Figure 4 This is a schematic diagram showing the clamping block clamped to the outside of the connector in another embodiment of the portable testing tool for communication circuit cables of the present invention; Figure 5 This is a schematic diagram of a 2M circuit structure.

[0034] The attached diagram shows the markings and corresponding component names: 1. Light-emitting diode indicator light; 2. Protective housing; 3. Adjusting cylinder; 301. Inner cavity; 4. Terminal interface; 5. Clamping block; 6. Second spring; 7. First spring; 8. Center conductor; 9. Support tube; 10. Connector; 13. Strip hole; 14. Adjusting rod; 15. Locking nut; 16. Support rod; 17. Moving hole; 18. Limiting groove; 19. Limiting bead; 20. Third spring; 21. Mounting groove. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0036] As one embodiment of this application, such as Figure 1As shown, this embodiment provides a portable testing tool for communication circuit cables, including a light-emitting diode indicator 1 and a protective shell 2. The light-emitting diode indicator 1 is press-fitted to the end of the protective shell 2. The portable testing tool for communication circuit cables in this embodiment also includes an adjusting cylinder 3, a terminal interface 4, and at least two clamping blocks 5. The top of the adjusting cylinder 3 is vertically slidably engaged with the protective shell 2. The terminal interface 4 is located inside the adjusting cylinder 3 and is vertically slidably engaged with the adjusting cylinder 3. The bottom of the adjusting cylinder 3 is provided with a slope. A center conductor 8 is connected to the terminal interface 4, and a support tube 9 is connected to the top of the terminal interface 4. The center conductor 8 is located inside the support tube 9, and the top of the support tube 9 is connected to the top wall of the protective shell 2. In this embodiment, the support tube 9 is sleeved on the outside of the center conductor 8 and there is a gap between the support tube 9 and the center conductor 8. The two ends of the support tube 9 are respectively press-fitted and fixed to the top of the protective shell 2 and the top of the terminal interface 4; the positive and negative terminals of the LED indicator 1 are respectively connected to the positive and negative terminals of the terminal interface 4. The clamping block 5 is hinged to the outside of the terminal interface 4. The top of the clamping block 5 is provided with a wedge surface that cooperates with the bottom inclined surface of the adjusting cylinder 3. A first spring 7 is connected between the clamping block 5 and the terminal interface 4. The downward sliding of the adjusting cylinder 3 can drive the lower part of the clamping block 5 to swing inward. A limiting unit is provided between the adjusting cylinder 3 and the protective shell 2 to lock the position of the adjusting cylinder 3.

[0037] In one embodiment, a support rod 16 is horizontally inserted through the adjusting cylinder 3, and a movable hole 17 is provided at the upper part of the terminal interface 4. The support rod 16 passes through the movable hole 17 and can slide vertically within the movable hole 17. In this embodiment, an insertion hole for the support rod 16 to pass through is provided horizontally on the adjusting cylinder 3. The support rod 16 is inserted into the insertion hole and passes through the movable hole 17, thereby ensuring the connection between the adjusting cylinder 3 and the terminal interface 4 and preventing the terminal interface 4 from sliding out of the adjusting cylinder 3 under the action of gravity. In this embodiment, a through hole is provided on the support rod 16, and the central conductor 8 passes through the through hole.

[0038] In one embodiment, multiple clamping blocks 5 are provided, and the multiple clamping blocks 5 are evenly distributed around the circumference of the terminal interface 4. The bottom of the adjusting cylinder 3 is chamfered to form a conical surface, and the wedge surfaces of the multiple clamping blocks 5 are matched with the conical surface of the adjusting cylinder 3.

[0039] In one embodiment, the terminal interface 4 has the same number of spring mounting slots as the clamping blocks 5, and all the spring mounting slots are inclined downwards. One end of the first spring 7 is fixed in the spring mounting slot, and the other end of the first spring 7 is fixed inside the clamping block 5.

[0040] In one embodiment, such as Figure 1As shown, in this embodiment, both the adjusting cylinder 3 and the terminal interface 4 have a convex shape, and the adjusting cylinder 3 has an inner cavity 301. The center of the protective shell 2 and the center of the adjusting cylinder 3 both have sliding holes. The central part of the adjusting cylinder 3 is vertically slidably engaged with the sliding hole of the protective shell 2, and the central part of the terminal interface 4 is vertically slidably engaged with the sliding hole of the adjusting cylinder 3.

[0041] In one embodiment, combined Figure 3 As shown, the top wall of the adjusting cylinder 3 is provided with an upper groove, and the terminal interface 4 is provided with lower grooves on both sides of the center, which are directly opposite to the upper groove. In this embodiment, there are two upper grooves and two lower grooves. A second spring 6 is provided between the upper groove and the lower groove. The two ends of the second spring 6 are connected to the upper groove and the lower groove respectively, so as to support the adjusting cylinder 3. After the adjusting cylinder 3 slides down, it is convenient to drive the adjusting cylinder 3 to automatically reset upward later. The limiting unit in this embodiment includes an adjusting rod 14 and a locking nut 15. A strip hole 13 is provided on one side of the protective shell 2. One end of the adjusting rod 14 is connected to the adjusting cylinder 3. In this embodiment, the adjusting rod 14 is threadedly connected to the adjusting cylinder 3. The other end of the adjusting rod 14 passes through the strip hole 13. The adjusting rod 14 and the strip hole slide vertically together. The locking nut 15 is located outside the strip hole 13 and is threadedly connected to the adjusting rod 14.

[0042] When it is necessary to slide the adjusting cylinder 3 downwards to clamp the clamping block 5 onto the cable connector 10 or the terminal on the patch panel (the testing tool in this invention can be used directly with the cable connector for testing, or with the terminal on the patch panel for testing), make the bottom of the terminal interface 4 abut against the end of the cable connector 10 or the terminal on the patch panel, then loosen the locking nut 15, and then pull the adjusting rod 14 downwards, as shown. Figure 4 As shown, this causes the adjusting cylinder 3 to slide downwards, causing the inclined surface at the bottom of the adjusting cylinder 3 to squeeze the clamping block 5 inwards and clamp the cable connector 10 or the terminal on the patch panel. During this process, the multiple clamping blocks 5 have an automatic alignment function, thereby aligning the center conductor 8 on the terminal interface 4 with the center conductor 8 on the cable connector 10 or the terminal, thus achieving connection. Finally, by tightening the locking nut 15, the vertical position of the adjusting cylinder 3 is locked to ensure normal testing. At this time, the condition of the cable is determined by whether the LED indicator 1 is lit. After the test is completed, the locking nut 15 is loosened, allowing the adjusting cylinder 3 to return to its original position under the action of the second spring 6.

[0043] In one embodiment, combined Figure 1 and Figure 2As shown, the limiting unit includes multiple limiting grooves 18 opened inside the sliding hole of the protective shell 2, a mounting groove 21 set on the outside of the adjusting cylinder 3, and a third spring 20 and a limiting bead 19 set in the mounting groove 21. The multiple limiting grooves 18 are distributed axially along the sliding hole of the protective shell 2. The two ends of the third spring 20 are respectively connected to the limiting bead 19 and the mounting groove 21, and the limiting bead 19 can be inserted into the limiting groove 18 to lock the position of the adjusting cylinder 3.

[0044] In this embodiment, two or more sets of limiting units are provided, and the two or more sets of limiting units are evenly distributed along the circumference of the sliding hole of the protective shell 2. In this embodiment, the limiting groove 18 is a semi-circular groove, and the limiting bead 19 is spherical, so that the matching and replacement between the limiting bead 19 and the limiting groove 18 is smooth and the jamming is reduced.

[0045] In this embodiment, when the adjusting cylinder 3 slides downward, the limiting bead 19 compresses the third spring 20 under the pressure of the inner wall of the sliding hole. When the adjusting cylinder 3 moves to the position of the limiting groove 18, the third spring 20 automatically resets and pushes the limiting bead 19 into the limiting groove 18, thereby locking the position of the adjusting cylinder 3. It can automatically lock according to the position of the adjusting cylinder 3 as it slides down, without the need for other locking operations, making adjustment convenient and fast.

[0046] The specific implementation process is as follows: Combination Figure 5 As shown, this invention specifically uses the L9 connector of the 2M cable in the E1 circuit of SDH communication equipment as an example. Through on-site testing of SDH equipment of different brands, the voltage between the center conductor 8 of the TX port of the 2M interface and the protective shell 2 is 2.1V. This invention utilizes the voltage of the 2M TX port of the SDH equipment itself to drive the LED indicator light to achieve the purpose of testing the L9 connector. The terminal interface 4 of the test tool is inserted into the TX port of the 2M patch panel (i.e., the terminal of the patch panel), and the adjusting cylinder 3 slides downward. The clamping block 5 clamps the outside of the TX port to ensure the stability of the contact between the test tool and the port, thereby ensuring the accuracy and efficiency of the test. If the LED indicator light 1 lights up, the cable can be judged to be qualified. If the LED indicator light 1 does not light up, the cable connector needs to be disassembled to check for open circuits or short circuits.

[0047] In troubleshooting 2M jumper faults, the RX cable of the 2M circuit can be connected to the TX interface by swapping the RX and TX interfaces. The LED is then driven by the voltage at the TX port to light up, thus enabling the testing of the RX cable connector 10.

[0048] It should be noted that the above description of the disclosed embodiments enables those skilled in the art to implement or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A portable testing tool for communication circuit cables, comprising a light-emitting diode indicator light and a protective housing, wherein the light-emitting diode indicator light is press-fitted to the end of the protective housing, characterized in that, It also includes an adjusting cylinder, a terminal interface, and at least two clamping blocks. The top of the adjusting cylinder is vertically slidably engaged with the protective housing. The terminal interface is located inside the adjusting cylinder and is vertically slidably engaged with the adjusting cylinder. The bottom of the adjusting cylinder is provided with a slope. A central conductor is connected to the terminal interface, and a support tube is connected to the top of the terminal interface. The central conductor is located inside the support tube, and the top of the support tube is connected to the top wall of the protective shell. The positive and negative terminals of the LED indicator are connected to the positive and negative terminals of the terminal interface, respectively. The clamping block is hinged to the outside of the terminal interface, the top of the clamping block is provided with a wedge surface that cooperates with the inclined surface of the bottom of the adjusting cylinder, and a first spring is connected between the clamping block and the terminal interface; The downward sliding of the adjusting cylinder can drive the lower part of the clamping block to swing inward, and a limiting unit for locking the position of the adjusting cylinder is provided between the adjusting cylinder and the protective shell.

2. The portable testing tool for communication circuit cables according to claim 1, characterized in that, A support rod is horizontally inserted through the adjusting cylinder, and a movable hole is opened at the upper part of the terminal interface. The support rod passes through the movable hole and can slide vertically within the movable hole.

3. A portable testing tool for communication circuit cables according to claim 2, characterized in that, A through hole is formed on the support rod, and the central conductor passes through the through hole.

4. A portable testing tool for communication circuit cables according to claim 1, characterized in that, The clamping blocks are provided in multiple ways, and the multiple clamping blocks are evenly distributed along the circumference of the terminal interface.

5. A portable testing tool for communication circuit cables according to claim 4, characterized in that, The bottom of the adjusting cylinder has a beveled edge forming a conical surface, and the wedge surfaces of the multiple clamping blocks are matched with the conical surface of the adjusting cylinder.

6. A portable testing tool for communication circuit cables according to claim 1, characterized in that, The terminal interface has the same number of spring mounting slots as the clamping blocks, and all the spring mounting slots are inclined downwards. One end of the first spring is fixed in the spring mounting slot, and the other end of the first spring is fixed inside the clamping block.

7. A portable testing tool for communication circuit cables according to any one of claims 1-6, characterized in that, Both the adjusting cylinder and the terminal interface have a convex shape, and the adjusting cylinder has an internal cavity. The center of the protective shell and the center of the adjusting cylinder both have sliding holes. The central part of the adjusting cylinder slides vertically with the sliding hole of the protective shell, and the central part of the terminal interface slides vertically with the sliding hole of the adjusting cylinder.

8. A portable testing tool for communication circuit cables according to claim 7, characterized in that, The top wall of the regulating cylinder is provided with an upper groove, and both sides of the center of the terminal interface are provided with lower grooves that are directly opposite the upper groove. A second spring is provided between the upper groove and the lower groove. The limiting unit includes an adjusting rod and a locking nut. A strip-shaped hole is provided on one side of the protective shell. One end of the adjusting rod is connected to the adjusting cylinder, and the other end of the adjusting rod passes through the strip-shaped hole. The adjusting rod slides vertically with the strip-shaped hole. The locking nut is located outside the strip-shaped hole and is threadedly connected to the adjusting rod.

9. A portable testing tool for communication circuit cables according to claim 7, characterized in that, The limiting unit includes multiple limiting grooves formed inside the sliding hole of the protective shell, a mounting groove disposed on the outside of the adjusting cylinder, and a third spring and a limiting bead disposed in the mounting groove. The multiple limiting grooves are distributed axially at intervals along the sliding hole of the protective shell. The two ends of the third spring are respectively connected to the limiting bead and the mounting groove, and the limiting bead can be inserted into the limiting groove to lock the position of the adjusting cylinder.

10. A portable testing tool for communication circuit cables according to claim 9, characterized in that, The limiting unit is provided in two or more sets, and the two or more sets of the limiting unit are evenly distributed along the circumference of the sliding hole of the protective shell.

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