A cable low-noise testing device

Abstract

This application discloses a low-noise cable testing device, which includes a support base, a detection support mechanism, a lower balance bar, two shielded detection boxes, an upper balance bar, a cable clamping mechanism, a vertical fixing rod mechanism, and a suspended weight sliding mechanism. The two cable clamping mechanisms are used to clamp the two ends of the cable, the two shielded detection boxes are used for insertion of the cable ends, and the suspended weight sliding mechanism is used for insertion of the cable at the middle position and pulling the cable downward. This application utilizes multiple rods and the detection support mechanism to construct a double-column symmetrical gantry frame structure, which improves the overall structural stability of the device under stress. By setting up shielded detection boxes to provide independent testing space for the cable ends, the interference of external electromagnetic signals on the test results is reduced. Combined with the cooperation of the suspended weight sliding mechanism and the cable clamping mechanism, the cable can quickly complete end fixing and middle suspension, improving the ease of operation and the smoothness of tension application.

Description

Technical Field

[0001] This application relates to the field of cable testing equipment technology, and in particular to a low-noise cable testing device. Background Technology

[0002] Cable noise testing is an important method for evaluating electrical signal interference generated by cables under stress or motion. Traditional cable noise testing methods mainly use a simple single-point suspension counterweight to apply tension to the cable. During the test, this type of testing device is prone to pendulum-like swaying when the weight is subjected to minor impacts or surrounding airflow disturbances. It cannot provide a constant and stable vertical downward tension to the cable, resulting in irregular fluctuations in mechanical stress during the test, which directly affects the reliability of the noise test data. Furthermore, most existing devices are in an open state during cable testing and lack electromagnetic shielding measures. Stray signals from the external environment can easily enter the test circuit, causing distortion of the acquired electrical signals. Summary of the Invention

[0003] In order to improve the shortcomings of the existing technology in terms of unstable tensile testing and susceptibility to external electromagnetic interference, this application provides a low-noise cable testing device.

[0004] The cable low-noise testing device provided in this application adopts the following technical solution: A low-noise cable testing device includes a support base, a detection support mechanism connected to the support base, a lower balance bar connected to the lower ends of the two detection support mechanisms and located between the two detection support mechanisms, two shielded detection boxes connected to the upper ends of the detection support mechanisms, an upper balance bar connected to the upper ends of the two detection support mechanisms and located between the two shielded detection boxes, two clamping mechanisms for clamping cables, a vertical fixing rod mechanism located between the upper balance bar and the lower balance bar and connected at both ends to the upper balance bar and the lower balance bar respectively, and a load-bearing sliding mechanism slidably connected to the vertical fixing rod mechanism and used for sliding along the length direction of the vertical fixing rod mechanism; The two clamping mechanisms are used to clamp the two ends of the cable, the two shielding detection boxes are used for the cable ends to be inserted, and the weight sliding mechanism is used for the cable to be inserted at the middle position and pulled down to tighten the cable.

[0005] By adopting the above technical solution, a double-column symmetrical gantry frame structure is constructed using multiple rods and a testing support mechanism, which improves the overall structural stability of the device under stress. By setting up a shielded testing box, an independent testing space is provided for the cable end, reducing the interference of external electromagnetic signals on the test results. Combined with the cooperation of the hanging sliding mechanism and the wire clamping mechanism, the cable can quickly complete the end fixing and middle suspension, improving the ease of operation and the smoothness of tension application.

[0006] Preferably, the support base includes a first support plate and a second support plate disposed opposite to the first support plate; The detection support mechanism includes a first support rod fixedly connected to the first support plate, a second support rod fixedly connected to the second support plate and correspondingly arranged with the first support rod, a first fixing plate fixedly connected to the upper end of the first support rod, and a second fixing plate fixedly connected to the upper end of the second support rod; the two ends of the upper balance rod are fixedly connected to the first fixing plate and the second fixing plate, respectively.

[0007] By adopting the above technical solution, the first support plate and the second support plate provide a distributed support center of gravity, which, together with the first support rod, the second support rod, and the first and second fixed plates at the top, form a closed-loop load-bearing support; this application disperses the downward pull generated by the central suspended weight, reduces the tilting or deformation of the overall frame of the device, and improves the reliability of the support frame.

[0008] Preferably, the shielding detection box includes a first detection box fixedly connected to the first fixing plate and a second detection box fixedly connected to the second fixing plate, wherein the first detection box and the second detection box are respectively used for inserting both ends of the cable.

[0009] By adopting the above technical solution, the first test box and the second test box are independently set on both sides of the bracket, so that the test interfaces at both ends of the cable are in two independent metal shielded spaces. This application not only avoids crosstalk between the signals at the beginning and end of the cable, but also further blocks the influence of the external environmental electric field on the access terminal, and improves the authenticity of the noise test data.

[0010] Preferably, the wire clamping mechanism includes a first fixed wire clamp fixedly connected to the first fixed plate, a second fixed wire clamp fixedly connected to the second fixed plate, a third wire clamp connected to the first detection box and used to clamp one end of the cable, and a fourth wire clamp connected to the second detection box and used to clamp the other end of the cable.

[0011] By adopting the above technical solution, the clamping mechanism is divided into a fixed clamp and a terminal clamp connected to the shielded test box. The first and second fixed clamps are used to bear the counterweight tension in the middle of the cable to prevent the cable from slipping. The third and fourth terminal clamps are used to maintain the physical contact between the cable end and the test instrument. This dual clamping design of separating mechanical force and electrical connection reduces the direct force acting on the test interface and improves the stability of the connection.

[0012] Preferably, both the first and second fixed wire clamps include a wire clamping seat, a guide side plate connected to the side wall of the wire clamping seat, a screw guide seat fixedly connected to the guide side plate, a rotary clamping screw threadedly connected to the screw guide seat, and a movable wire clamping plate fixedly connected to the end of the rotary clamping screw and aligned with the wire clamping seat, wherein the side wall of the movable wire clamping plate is close to the guide side plate.

[0013] By adopting the above technical solution, when the tester rotates the rotating clamping screw, the rotating clamping screw pushes the movable clamping plate to move towards the clamping seat to press the cable. The movable clamping plate is constrained by the track of the guide side plate and will not rotate or deviate, thereby ensuring that the movable clamping plate and the clamping seat can fit in parallel, providing a stable and continuously adjustable clamping force and preventing local shearing and crushing damage to the cable sheath.

[0014] Preferably, both the third and fourth wire clamps include a limiting seat fixedly connected to the shielding detection box, a fixed wire clamping side plate fixedly connected to the limiting seat, a hinged actuating part hinged to the limiting seat, a movable wire clamping side plate connected to one end of the hinged actuating part and aligned with the fixed wire clamping side plate, and an elastic reset component connected to the other end of the hinged actuating part and connected to the limiting seat.

[0015] By adopting the above technical solution, the tester can press the hinge to overcome the elastic force of the elastic reset component, causing the movable clamping side plate to move away from the fixed clamping side plate to open the opening; after the tester releases his hand, the elastic reset component releases its elastic force to drive the movable clamping side plate back into place, clamping the cable end; this application speeds up the loading and unloading speed of cable test terminals and improves the overall testing efficiency and stability.

[0016] Preferably, the vertical fixing rod mechanism includes two fixed flanges fixedly connected to the upper balance rod, a first vertical guide rod whose two ends are fixedly connected to the fixed flanges and the lower balance rod respectively, a second vertical guide rod whose two ends are fixedly connected to the other fixed flange and the lower balance rod respectively, and a load-bearing elastic buffer assembly respectively sleeved on the outer side of the lower end of the first vertical guide rod and the second vertical guide rod.

[0017] By adopting the above technical solution, a double-track sliding path is constructed using parallel first and second vertical guide rods, so that the load-bearing mechanism will not rotate circumferentially or sway laterally during the up and down movement. At the same time, a load-bearing elastic buffer component is configured at the bottom of the guide rod. In the event of a broken test cable or accidental detachment of the counterweight, the load-bearing elastic buffer component can absorb the kinetic energy of the fall and prevent hard impact from damaging the base structure.

[0018] Preferably, the weight-lifting sliding mechanism includes a counterweight sliding seat respectively sleeved on the outside of the first vertical guide rod and the second vertical guide rod, a cable hook assembly fixedly connected to the counterweight sliding seat and used for inserting the cable at the middle position, and a counterweight connecting seat fixedly connected to the cable hook assembly and used for inserting the counterweight block.

[0019] By adopting the above technical solutions, the counterweight sliding seat, in conjunction with the double-rod guide, ensures that the downward pulling force is vertical and uniform; the cable hook assembly adopts an open insertion port design, which makes it easy to directly hook the cable in the middle; the counterweight connecting seat allows testers to stack or reduce counterweights according to different specifications of cables, realizing the flexible adjustment function of the test pulling force.

[0020] Preferably, it further includes a sliding limiting mechanism connected to the middle position of the upper balance bar and used for movable insertion and cooperation with the lifting sliding mechanism.

[0021] By adopting the above technical solution, a sliding limit mechanism is set at the upper balance bar at the top of the device; when the tester installs the cable or replaces the counterweight, the sliding limit mechanism can suspend and lock the counterweight sliding seat at a higher position, so that the cable is in a slack state, reducing the burden on the tester to lift the counterweight with one hand and improving the safety of equipment operation.

[0022] Preferably, the sliding limiting mechanism includes a locking guide tube fixedly connected to the upper balance bar and located between the first vertical guide rod and the second vertical guide rod, an insertion limiting part inserted into the locking guide tube at one end away from the load-bearing sliding mechanism, a sliding insertion part movably inserted into the locking guide tube and used to extend from the other end of the locking guide tube, a limiting protrusion connected to the end of the sliding insertion part and used to insert and cooperate with the load-bearing sliding mechanism, an elastic pressing component inserted between the sliding insertion part and the insertion limiting part, and a locking lever fixedly connected to the sliding insertion part and movably inserted into the locking guide tube; The cable hook assembly is provided with a limiting hole for the insertion of the limiting protrusion. The locking guide is provided with an axial sliding groove arranged along the axial direction of the locking guide and a radial sliding groove arranged along the radial direction of the locking guide and communicating with the axial sliding groove. The locking lever is movably inserted into the axial sliding groove and the radial sliding groove.

[0023] By adopting the above technical solution, the toggle locking lever switches between the axial sliding groove and the radial sliding groove, and in conjunction with the elastic pressing component, pushes the sliding insertion part to move relative to the insertion limiting part, controlling the insertion and removal of the limiting protrusion and the limiting hole of the cable hook assembly, thereby realizing the rapid locking and releasing of the lifting sliding mechanism. In this application, the heavier counterweight sliding seat is pre-locked below the upper balance bar, reducing the physical exertion of lifting with one hand and the risk of slippage during test preparation, and improving the ease of operation. Furthermore, after the locking lever enters the radial sliding groove, it forms a mechanical self-lock, and the clamping force of the elastic pressing component prevents the limiting protrusion from being vibrated and retracted, avoiding interference when the lifting sliding mechanism is locked, and ensuring the ease of installation.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. This application relies on the upper and lower balance bars in conjunction with the detection support mechanism to construct a double-column frame, which improves the rigidity and stability of the device when it is subjected to tensile force. At the same time, the vertical fixed bar mechanism provides a precise linear guide path for the suspended weight sliding mechanism, preventing the pendulum-like swaying that is easy to occur in traditional free suspension counterweights, ensuring the verticality and constancy of the downward pull force, avoiding the introduction of additional mechanical friction vibration, and ensuring the authenticity, accuracy and reliability of the low noise test data of the cable. 2. This application provides an independent testing space for the cable end by setting up a shielded testing box, forming a closed electromagnetic isolation zone, which reduces the interference of external electromagnetic signals on the test results; effectively blocks external stray electric fields and reduces signal crosstalk at both ends of the cable, improving the authenticity of noise test data; 3. In this application, the toggle locking lever switches between the axial sliding groove and the radial sliding groove. This, in conjunction with the elastic pressing component, pushes the sliding insertion part relative to the insertion limiting part, controlling the insertion and removal of the limiting protrusion and the limiting hole of the cable hook assembly, thus achieving rapid locking and releasing of the lifting sliding mechanism. This application pre-locks the heavier counterweight sliding seat below the upper balance bar, reducing the physical exertion of lifting with one hand and the risk of slippage during test preparation, improving operational convenience. Furthermore, after the locking lever enters the radial sliding groove, it forms a mechanical self-lock, using the clamping force of the elastic pressing component to prevent the limiting protrusion from retracting due to vibration, avoiding interference when locking the lifting sliding mechanism, and ensuring ease of installation. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the exploded structure of an embodiment of this application. Figure 1 .

[0026] Figure 2 This is a schematic diagram of the exploded structure of an embodiment of this application. Figure 2 .

[0027] Figure 3 for Figure 2 Enlarged view of section A.

[0028] Figure 4 for Figure 2 Enlarged view of section B.

[0029] Explanation of reference numerals in the attached figures: 1. Support base; 11. First support plate; 12. Second support plate; 2. Detection support mechanism; 21. First support rod; 22. Second support rod; 23. First fixing plate; 24. Second fixing plate; 3. Lower balance bar; 4. Shielding detection box; 41. First detection box; 42. Second detection box; 5. Upper balance bar; 6. Wire clamping mechanism; 61. First fixed wire clamp; 62. Second fixed wire clamp; 63. Third wire clamp; 64. Fourth wire clamp; 611. Wire clamp seat; 612. Guide side plate; 613. Screw guide seat; 614. Rotary clamping screw; 615. Movable wire clamping plate; 631. Limit seat; 632. Fixed wire clamping side plate; 633. Hinge actuating part; 634. Movable wire clamping side plate; 635. Elastic reset component; 7. Vertical fixing rod mechanism; 71. Fixing flange; 72. First vertical guide rod; 73. Second vertical guide rod; 74. Elastic buffer assembly for suspended weight; 8. Sliding mechanism for suspended weight; 81. Counterweight sliding seat; 82. Cable hook assembly; 83. Counterweight connecting seat; 821. Limiting hole; 9. Sliding limiting mechanism; 91. Locking guide tube; 92. Insertion limiting part; 93. Sliding insertion part; 94. Limiting protrusion; 95. Elastic pressing assembly; 96. Locking lever; 911. Axial sliding groove; 912. Radial sliding groove. Detailed Implementation

[0030] The following is in conjunction with the appendix Figures 1 to 4 This application will be described in further detail.

[0031] This application discloses a cable low-noise testing device. (Refer to...) Figure 1A low-noise cable testing device includes a support base 1, which serves as the mounting surface for the entire device and is placed on a horizontal working surface. A testing support mechanism 2 is vertically connected above the support base 1, and a lower balance bar 3 is horizontally connected between the lower ends of the testing support mechanism 2. Two shielded testing boxes 4, each used to wrap the cable ends, are connected to the upper ends of the testing support mechanism 2. An upper balance bar 5, connected to the upper ends of the two testing support mechanisms 2, is horizontally positioned between the two shielded testing boxes 4. The upper balance bar 5 and the lower balance bar 3 together increase the torsional stiffness of the frame. Two wire clamping mechanisms 6 are mounted on the support base 1 and the upper balance bar 5. The wire clamping mechanisms 6 are used for... Securely lock both ends of the cable to be tested; simultaneously, a vertical fixing rod mechanism 7 is vertically installed between the upper balance rod 5 and the lower balance rod 3, and a weight-sliding mechanism 8 is fitted on the outside of the vertical fixing rod mechanism 7; during testing, the tester fixes both ends of the cable to the two clamping mechanisms 6, inserts the metal contacts at the cable ends into the shielded test box 4 for data connection, and then hangs the middle of the cable in a "U"-shaped bend into the weight-sliding mechanism 8; the weight-sliding mechanism 8 slides downward along the vertical fixing rod mechanism 7 under the action of gravity, thereby applying a smooth vertical downward pulling force to the cable to simulate the cable's stress state and conduct a low-noise test; This application relies on the upper balance bar 5 and the lower balance bar 3, together with the detection support mechanism 2, to construct a double-column frame, which improves the rigidity and stability of the device when it is subjected to tensile force. At the same time, the vertical fixed bar mechanism 7 provides a precise linear guide path for the suspended weight sliding mechanism 8, preventing the pendulum-like swaying that is easy to occur in traditional free suspension counterweights, ensuring the verticality and constancy of the downward pull force, and avoiding the introduction of additional mechanical friction vibration. In addition, the two shielded detection boxes 4 provide independent electromagnetic shielding space for the test connectors at both ends of the cable, effectively blocking stray electromagnetic signals from the external space from entering the test circuit. From the mechanical structure anti-sway stability and electromagnetic isolation protection, the authenticity, accuracy and reliability of the low noise test data of the cable are ensured.

[0032] The cable low noise testing device provided in this application serves as a mechanical force applied to a locally shielded platform, which together with an external electrical signal detection and analysis device (not shown in the figure) forms a complete cable noise testing system. The cable end is connected to an external electrical signal detection instrument through a clamping mechanism 6 inside the shielded testing box 4. The electrical signal detection instrument includes at least one of a digital oscilloscope, a microvoltmeter, or a charge amplifier.

[0033] Furthermore, such as Figure 2As shown, the support base 1 specifically includes a parallel first support plate 11 and a second support plate 12, which are arranged opposite to each other to provide distributed support surfaces; the detection support mechanism 2 includes a first support rod 21 vertically welded to the top surface of the first support plate 11, and a second support rod 22 vertically welded to the top surface of the second support plate 12 and symmetrically arranged with the first support rod 21; a first fixing plate 23 is horizontally connected to the top of the first support rod 21, and a second fixing plate 24 is horizontally connected to the top of the second support rod 22; the two ends of the upper balance bar 5 are respectively fixed to the side walls of the first fixing plate 23 and the second fixing plate 24 with bolts; this application constructs a stable gantry-type symmetrical frame structure, which effectively disperses the force generated by the central hanging weight, so that the entire device will not deform inward or outward when subjected to large cable tension.

[0034] Furthermore, referring to Figure 2 The shielded test box 4 includes a first test box 41 mounted on the upper side of the first fixing plate 23 by screws, and a second test box 42 mounted on the upper side of the second fixing plate 24; the left end of the cable passes through the reserved hole and is inserted into the internal space of the first test box 41, and the right end of the cable is inserted into the internal space of the second test box 42; this dual independent chamber metal shielding design of the present application is equivalent to providing Faraday cage protection for the weak signal connection points at both ends of the cable, blocking radio frequency signals and electrostatic field interference in the environment, while preventing crosstalk between the test channels at both ends of the cable, and ensuring the stability of the acquired noise level data.

[0035] The housing material of the first detection box 41 and the second detection box 42 is preferably a high-conductivity metal material, such as aluminum alloy, copper, or stainless steel with a conductive coating. Using a high-conductivity metal material allows for the construction of a Faraday cage structure for the test terminals. When electromagnetic waves from the external environment come into contact with the surfaces of the first detection box 41 and the second detection box 42, the free electrons inside the metal material are excited and move, generating an induced current. The additional electric field generated by the induced current can counteract the energy of the external electromagnetic waves penetrating into the first detection box 41 and the second detection box 42. The outer surfaces of the first detection box 41 and the second detection box 42 are provided with grounding terminals, and the first detection box 41 and the second detection box 42 establish a physical conductive connection with the external grounding grid through the grounding terminals. With the cooperation of the high-conductivity metal material and the grounding connection, the shielded detection box 4 can quickly conduct the induced charge accumulated on the surface to the ground, preventing radio frequency signals or power frequency magnetic fields in the space from entering the housing, thereby ensuring the accuracy of the test instrument in collecting weak frictional noise from the cable.

[0036] Specifically, such as Figure 2As shown, the wire clamping mechanism 6 includes a first fixed wire clamp 61 and a second fixed wire clamp 62 respectively installed on the outside of the first fixed plate 23 and the second fixed plate 24, and a third terminal clamp 63 and a fourth terminal clamp 64 respectively installed on the first test box 41 and the second test box 42. During cable installation, the first fixed wire clamp 61 and the second fixed wire clamp 62 are used to clamp the outer insulation layer of the cable and bear the main mechanical tension applied by the hanging weight. The third terminal clamp 63 and the fourth terminal clamp 64 are used to clamp the exposed metal core wire after the cable end is stripped. The stripped cable between the first fixed wire clamp 61 and the third terminal clamp 63 is inserted into the first test box 41. The stripped cable between the second fixed wire clamp 62 and the fourth terminal clamp 64 is inserted into the second test box 42. This stress isolation design of the present application prevents the tension from being directly transmitted to the metal core wire, avoiding test interruption caused by loosening and falling off of the wiring due to pulling.

[0037] More specifically, refer to Figure 2 and Figure 3 The first fixed wire clamp 61 and the second fixed wire clamp 62 are structurally symmetrical. Both the first fixed wire clamp 61 and the second fixed wire clamp 62 include a wire clamping seat 611, and a guide side plate 612 is fixedly connected to the side wall of the wire clamping seat 611. A screw guide seat 613 is fixedly connected to the end of the guide side plate 612. The screw guide seat 613 has an internal threaded hole in its center, and a rotating clamping screw 614 is screwed through it. The end of the rotating clamping screw 614 facing the wire clamping seat 611 is movably connected to a movable wire clamping plate 615 through a bearing. The side wall of the wire clamp 615 slides against the inner wall of the guide side plate 612; the operator rotates the tail knob of the rotating clamping screw 614, the rotating clamping screw 614 generates axial displacement and pushes the movable wire clamp 615 closer to the wire clamp seat 611, thereby pressing the cable between the movable wire clamp 615 and the wire clamp seat 611; the guide side plate 612 can constrain the movable wire clamp 615, prevent the movable wire clamp 615 from rotating with the screw, and ensure that the clamping surface can be stably and evenly attached to the cable surface, preventing the cable sheath from being crushed.

[0038] In addition, such as Figure 3As shown, the third connector 63 and the fourth connector 64 are symmetrical in structure; both the third connector 63 and the fourth connector 64 include a limiting seat 631 fixed on the shielded detection box 4, and a fixed clamping side plate 632 is connected to the upper end of the limiting seat 631; a hinged actuating part 633 is hinged to the side of the limiting seat 631 by a pin, and a movable clamping side plate 634 that fits against the fixed clamping side plate 632 is provided on one end of the hinged actuating part 633 near the fixed clamping side plate 632, and an elastic reset part 635 in a compressed state is connected between the other end of the hinged actuating part 633 and the limiting seat 631. The tester presses the end of the hinged lever 633 with their finger, overcoming the resistance of the elastic reset component 635 to open the movable wire clamping side plate 634; after placing the exposed core wire of the cable into the opening, the tester releases their finger, and the elastic reset component 635 pushes the hinged lever 633 back to its original position, and the movable wire clamping side plate 634 and the fixed wire clamping side plate 632 together clamp the core wire; the quick-connect wiring structure of this application reduces the operation time of end wiring and reduces wiring errors, thereby making the test more accurate. The elastic reset component 635 is preferably a helical spring.

[0039] And, as Figure 2 As shown, the vertical fixing rod mechanism 7 includes two parallel fixed protrusions 71 fixed in the middle of the upper balance rod 5, a first vertical guide rod 72, and a second vertical guide rod 73. The top end of the first vertical guide rod 72 is fixed to one of the fixed protrusions 71, and the bottom end of the first vertical guide rod 72 is fixed to the lower balance rod 3. The top end of the second vertical guide rod 73 is fixed to the other fixed protrusion 71, and the bottom end of the second vertical guide rod 73 is fixed to the lower balance rod 3. A set of suspended weight elastic buffer components 74 are respectively sleeved on the outer surface of the first vertical guide rod 72 and the second vertical guide rod 73 near the bottom end of the lower balance rod 3. The double straight rod guide structure of the first vertical guide rod 72 and the second vertical guide rod 73 reduces the deflection or pendulum-like swaying caused when the counterweight component slides freely or slides down a single round rod. When the test cable is stressed to the yield limit and breaks, or when the tester makes a mistake and the counterweight falls off, the falling counterweight component will fall onto the suspended weight elastic buffer component 74, absorbing kinetic energy through elastic deformation to protect the bottom frame and the suspended weight sliding mechanism 8 from damage. The suspended load elastic buffer assembly 74 is preferably a spring.

[0040] Specifically, refer to Figure 2The weight-sliding mechanism 8 includes a horizontally arranged counterweight sliding seat 81. The counterweight sliding seat 81 has through holes on both sides and is sleeved on the outside of the first vertical guide rod 72 and the second vertical guide rod 73. The counterweight sliding seat 81 can slide freely along the guide rods. A cable hook assembly 82 with an inverted "U"-shaped groove is fixedly connected to the top of the counterweight sliding seat 81 by screws. The groove of the cable hook assembly 82 faces downward so that the middle part of the cable can be directly inserted. A long strip-shaped counterweight connecting seat 83 is connected to the bottom of the cable hook assembly 82. The tester can stack counterweights with different masses in the center hole on the counterweight connecting seat 83 according to the physical specifications of the cable being tested, and use a locking nut to prevent it from falling off, so as to achieve flexible configuration of the downward pulling force.

[0041] Furthermore, such as Figure 2 and Figure 4 As shown, the cable low-noise testing device is also equipped with a sliding limit mechanism 9 installed in the center of the upper balance bar 5, which is directly opposite the hanging weight sliding mechanism 8 below. Since the counterweight on the hanging weight sliding mechanism 8 has a large weight, the tester would have to continuously lift the counterweight sliding seat 81 with one hand before hanging the cable, which would consume a lot of physical strength and could easily lead to safety accidents. The sliding limit mechanism 9 can suspend and lock the counterweight sliding seat 81 below the upper balance bar 5 during the preparation stage, so that the tester can easily complete the wire threading, clamping and test wiring work at both ends of the cable. After the wiring is completed, the sliding limit mechanism 9 is released, and the hanging weight sliding mechanism 8 is lowered to tighten the cable, and the test can begin.

[0042] Furthermore, such as Figure 4 As shown, the sliding limiting mechanism 9 includes a locking guide tube 91 welded horizontally to the middle position of the upper balance bar 5. The locking guide tube 91 is hollow inside and located between the first vertical guide rod 72 and the second vertical guide rod 73. An insertion limiting part 92 is fixedly sealed inside the locking guide tube 91 at one end away from the lifting sliding mechanism 8. A sliding insertion part 93 that can slide along the length of the locking guide tube 91 is movably inserted inside the locking guide tube 91. The end of the sliding insertion part 93 protrudes outside the locking guide tube 91 and is connected to a cylindrical limiting protrusion 94. An elastic pressing assembly is pressed between the end of the sliding insertion part 93 and the insertion limiting part 92. Component 95; The side wall of the locking conduit 91 has a groove, including an axial sliding groove 911 arranged along the axial direction of the locking conduit 91 and a radial sliding groove 912 extending horizontally at the end of the axial sliding groove 911, the axial sliding groove 911 and the radial sliding groove 912 are connected; A protruding locking lever 96 is fixedly connected to the side wall of the sliding insertion part 93, the locking lever 96 passes through the axial sliding groove 911 or the radial sliding groove 912 and is exposed outside the locking conduit 91; The upper end of the cable hook assembly 82 is provided with a limiting hole 821 whose size matches that of the limiting protrusion 94; The elastic pressing assembly 95 is preferably a compression spring.

[0043] When the counterweight needs to be locked, the tester lifts the lifting sliding mechanism 8 upwards. When the lifting sliding mechanism 8 moves upwards to the position of the sliding limit mechanism 9, the tester moves the locking lever 96 into the axial sliding groove 911. The elastic pressing component 95 pushes the sliding plug part 93 to move away from the plug-in limit part 92, so that the limit protrusion 94 is inserted into the limit hole 821 on the cable hook assembly 82, so that the lifting sliding mechanism 8 is locked on the limit protrusion 94. After the tester installs the cable and counterweight, when unlocking, the locker moves the locking lever 96 in the direction close to the plug-in limit part 92. The sliding plug part 93 compresses the elastic pressing component 95, so that the limit protrusion 94 is pulled out from the limit hole 821, releasing the counterweight and tightening the cable. When it reaches the top, the locker lever 96 is moved laterally into the radial sliding groove 912. The locker lever 96 is pressed against the bottom edge of the radial sliding groove 912 to form a mechanical self-lock. By setting up the sliding limit mechanism 9, the counterweight sliding seat 81, which has a relatively large weight, can be pre-suspended and locked below the upper balance bar 5 during the test preparation stage. This reduces the physical exertion of test personnel continuously lifting the counterweight with one hand when performing tedious steps such as cable threading, end clamping, and test wiring. It effectively reduces the risk of accidents caused by the heavy object accidentally slipping out of their hands and improves the ease of operation. At the same time, by using the path switching of the locking lever 96 in the axial sliding groove 911 and the radial sliding groove 912, combined with the continuous thrust provided by the elastic pressing component 95, a stable mechanical self-locking structure is constructed. When the locking lever 96 is pushed into the radial sliding groove 912, the clamping force of the elastic pressing component 95 can prevent the limit protrusion 94 from automatically retracting due to minor external vibrations. This effectively avoids interference with the installation of the lifting sliding mechanism 8 and ensures the ease of installation of the device.

[0044] The implementation principle of the low-noise cable testing device in this application is as follows: Before the test begins, the tester first lifts the weight-sliding mechanism 8 upwards and moves it along the radial sliding groove 912 and the axial sliding groove 911 by operating the locking lever 96, so that the limiting protrusion 94 is inserted into the limiting hole 821 on the cable hook assembly 82, thereby suspending and locking the weight-sliding mechanism 8 below the upper balance bar 5. Subsequently, the tester passed both ends of the cable under test through the first fixed clamp 61 and the second fixed clamp 62 respectively, rotated the rotating clamping screw 614 to push the movable clamping plate 615 to clamp and fix the cable sheath; and inserted the exposed core wires stripped from both ends of the cable into the first test box 41 and the second test box 42 respectively, pressed the hinge toggle part 633 to open the movable clamping side plate 634, and after releasing, used the elastic reset part 635 to automatically clamp the core wires to complete the electrical connection; Next, the tester inserted the drooping, bent section of the cable into the groove of the cable hook assembly 82; After the wiring is completed, the tester reverses the operation of the locking lever 96 to exit the axial sliding groove 911, which drives the limiting protrusion 94 to exit the limiting hole 821. Under the action of gravity, the weight sliding mechanism 8 slides smoothly downward along the first vertical guide rod 72 and the second vertical guide rod 73. The weight on the counterweight connecting seat 83 applies a vertical pulling force to the cable. The testing equipment collects noise signals generated by cable deformation by connecting the detection devices inside the first detection box 41 and the second detection box 42. The independent metal shielding space isolates external environmental interference. If the cable breaks accidentally during the test, the suspended weight sliding mechanism 8 falls downward and impacts the suspended weight elastic buffer component 74 at the bottom. The material buffer deformation achieves anti-collision protection.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A cable low noise test apparatus, characterized by, The device includes a support base (1), a detection support mechanism (2) connected to the support base (1), a lower balance bar (3) connected to the lower ends of the two detection support mechanisms (2) and located between the two detection support mechanisms (2), two shielded detection boxes (4) connected to the upper ends of the detection support mechanisms (2), an upper balance bar (5) connected to the upper ends of the two detection support mechanisms (2) and located between the two shielded detection boxes (4), two wire clamping mechanisms (6) for clamping cables, a vertical fixing rod mechanism (7) located between the upper balance bar (5) and the lower balance bar (3) and connected at both ends to the upper balance bar (5) and the lower balance bar (3) respectively, and a load-bearing sliding mechanism (8) slidably connected to the vertical fixing rod mechanism (7) and used for sliding along the length direction of the vertical fixing rod mechanism (7). The two clamping mechanisms (6) are used to clamp the two ends of the cable, the two shielding detection boxes (4) are used to allow the two ends of the cable to be inserted, and the weight sliding mechanism (8) is used to allow the cable to be inserted at the middle position and pull the cable downward.

2. A cable low noise test apparatus according to claim 1, wherein, The support base (1) includes a first support plate (11) and a second support plate (12) disposed opposite to the first support plate (11). The detection support mechanism (2) includes a first support rod (21) fixedly connected to the first support plate (11), a second support rod (22) fixedly connected to the second support plate (12) and correspondingly arranged with the first support rod (21), a first fixing plate (23) fixedly connected to the upper end of the first support rod (21), and a second fixing plate (24) fixedly connected to the upper end of the second support rod (22). The upper balance bar (5) is fixedly connected at both ends to the first fixing plate (23) and the second fixing plate (24), respectively.

3. A cable low noise test apparatus as claimed in claim 2, wherein, The shielding detection box (4) includes a first detection box (41) fixedly connected to the first fixing plate (23) and a second detection box (42) fixedly connected to the second fixing plate (24). The first detection box (41) and the second detection box (42) are respectively used for inserting the two ends of the cable.

4. The cable low-noise testing device according to claim 3, characterized in that, The clamping mechanism (6) includes a first fixed clamp (61) fixedly connected to the first fixed plate (23), a second fixed clamp (62) fixedly connected to the second fixed plate (24), a third clamp (63) connected to the first detection box (41) and used to clamp one end of the cable, and a fourth clamp (64) connected to the second detection box (42) and used to clamp the other end of the cable.

5. The cable low-noise testing device according to claim 4, characterized in that, Both the first fixed wire clamp (61) and the second fixed wire clamp (62) include a wire clamping seat (611), a guide side plate (612) connected to the side wall of the wire clamping seat (611), a screw guide seat (613) fixedly connected to the guide side plate (612), a rotating clamping screw (614) threadedly connected to the screw guide seat (613), and a movable wire clamping plate (615) fixedly connected to the end of the rotating clamping screw (614) and aligned with the wire clamping seat (611). The side wall of the movable wire clamping plate (615) is close to the guide side plate (612).

6. The cable low-noise testing device according to claim 4, characterized in that, Both the third connector (63) and the fourth connector (64) include a limiting seat (631) fixedly connected to the shielding detection box (4), a fixed clamping side plate (632) fixedly connected to the limiting seat (631), a hinged actuating part (633) hinged to the limiting seat (631), a movable clamping side plate (634) connected to one end of the hinged actuating part (633) and aligned with the fixed clamping side plate (632), and an elastic reset component (635) connected to the other end of the hinged actuating part (633) and connected to the limiting seat (631).

7. The cable low-noise testing device according to claim 1, characterized in that, The vertical fixing rod mechanism (7) includes two fixed protrusions (71) fixedly connected to the upper balance rod (5), a first vertical guide rod (72) fixedly connected at both ends to the fixed protrusions (71) and the lower balance rod (3) respectively, a second vertical guide rod (73) fixedly connected at both ends to the other fixed protrusion (71) and the lower balance rod (3) respectively, and a load-bearing elastic buffer assembly (74) sleeved on the outer side of the lower end of the first vertical guide rod (72) and the second vertical guide rod (73) respectively.

8. The cable low-noise testing device according to claim 7, characterized in that, The weight sliding mechanism (8) includes a counterweight sliding seat (81) respectively sleeved on the outside of the first vertical guide rod (72) and the second vertical guide rod (73), a cable hook assembly (82) fixedly connected to the counterweight sliding seat (81) and used for inserting the cable at the middle position, and a counterweight connecting seat (83) fixedly connected to the cable hook assembly (82) and used for inserting the counterweight block.

9. A cable low-noise testing device according to claim 8, characterized in that, It also includes a sliding limit mechanism (9) that is connected to the middle position of the upper balance bar (5) and is used to movably engage with the lifting sliding mechanism (8).

10. A cable low-noise testing device according to claim 9, characterized in that, The sliding limiting mechanism (9) includes a locking guide tube (91) fixedly connected to the upper balance bar (5) and located between the first vertical guide bar (72) and the second vertical guide bar (73), an insertion limiting part (92) inserted into the locking guide tube (91) at one end away from the lifting sliding mechanism (8), a sliding insertion part (93) movably inserted into the locking guide tube (91) and used to extend from the other end of the locking guide tube (91), a limiting protrusion (94) connected to the end of the sliding insertion part (93) and used to insert and cooperate with the lifting sliding mechanism (8), an elastic pressing assembly (95) inserted between the sliding insertion part (93) and the insertion limiting part (92), and a locking lever (96) fixedly connected to the sliding insertion part (93) and movably inserted into the locking guide tube (91). The cable hook assembly (82) is provided with a limiting hole (821) for the insertion of the limiting protrusion (94). The locking guide (91) is provided with an axial sliding groove (911) arranged along the axial direction of the locking guide (91) and a radial sliding groove (912) arranged along the radial direction of the locking guide (91) and communicating with the axial sliding groove (911). The locking lever (96) is movably inserted into the axial sliding groove (911) and the radial sliding groove (912).

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