Cable testing device and moving cable testing method

Abstract

The invention discloses a cable testing device and a cable testing method. The cable test device comprises a driving part and a sliding rail part, wherein the driving part is used for providing driving force; the base part is provided with a first mounting part for mounting a first end of a tested cable, and the sliding rail part; the sliding rail part is slidably mounted on the sliding rail part, and the sliding rail part is provided with a second mounting part used for mounting the second end of the tested cable of the sliding rail part; the cable testing apparatus also includes an eccentric link mechanism arranged to interconnect the reciprocating portion and the driving portion and having: an eccentric that is driven to rotate by the driving portion; the sliding rail part sliding fixing part is connected with the sliding rail part reciprocating motion part so as to drive the sliding rail part reciprocating motion part to reciprocate along the sliding rail part; one end of the sliding rail part connecting rod is connected with the eccentric wheel, and the other end of the sliding rail part connecting rod is connected to the sliding fixing piece.

Description

Technical Field

[0001] The invention relates to the field of cable motion testing, and in particular to a method for testing a motion cable related to a motion cable testing bench. Background Art

[0002] In the aircraft design process, in order to meet the electrical connection of moving parts, it is necessary to design moving cables to meet the wiring requirements of moving equipment and drive the cables to move during the movement of the moving equipment. Moving cables can be divided into bending (mechanism translation), torsion (mechanism rotation) and bending plus torsion (mechanism rotation and translation) according to different movement modes.

[0003] Compared with static cables, moving cables must still meet functional requirements while bearing the stress caused by movement on the cables. For cables of the same configuration, the service life of moving cables is often lower than that of static cables. The service life of moving cables cannot be inferred from the qualified identification test report of the components that constitute the cables. For moving cables of different design configurations, the use of different components, different movement modes, and different laying paths often have different effects on the service life of moving cables. It is impossible to simply derive the service life of each moving cable through theoretical analysis. Instead, it is necessary to use a combination of theoretical analysis and simulated motion experiments to verify the results of theoretical analysis with simulated motion experiments, and provide data support for improving and optimizing theoretical analysis methods. At present, the most widely used method for verifying the life of moving cables is to simulate the actual application scenarios of the entire life cycle of aircraft in the laboratory as much as possible, and test the service life of all moving cables.

[0004] There are already some cable test devices on the market for testing the fatigue life of moving cables. However, some test devices have a single movement form, which is far from the movement state of the moving cable in actual use conditions. They cannot simulate the movement state of the moving cable under use conditions, and therefore cannot provide test data that is closer to the actual use conditions for the fatigue life evaluation of the moving cable. In addition, the existing test equipment requires complex operations to test different cable movement distances or adjust the movement distance tests for different cables.

[0005] Therefore, it is expected to improve the existing cable test device, provide more flexible test means, and improve the simulation accuracy. In addition, it is expected to provide monitoring of the shield continuity and core state of the moving cable to improve the detection efficiency of the test device. Summary of the invention

[0006] To overcome the deficiencies in the prior art, the present invention provides a cable testing device, comprising: a driving part, the driving part is used to provide a driving force; a base part, the base part having a first mounting part and a slide rail part for mounting the first end of the cable under test; and a reciprocating part, the reciprocating part is slidably mounted on the slide rail part and has a second mounting part for mounting the second end of the cable under test; the cable testing device also includes an eccentric wheel connecting rod mechanism, the eccentric wheel connecting rod mechanism is arranged to interconnect the reciprocating part and the driving part and comprises: an eccentric wheel, the eccentric wheel is driven to rotate by the driving part; a sliding fixing member, the sliding fixing member is connected to the reciprocating part to drive the reciprocating part to reciprocate along the slide rail part; and a connecting rod, one end of the connecting rod is connected to the eccentric wheel, and the other end of the connecting rod is connected to the sliding fixing member.

[0007] According to one aspect of the present invention, the second mounting portion of the reciprocating portion includes at least two beams at different heights and extending along an extending direction of the slide rail portion.

[0008] According to another aspect of the present invention, the frame structure of the base portion mainly includes a bottom frame and two side frames vertically arranged upward from the sides of the bottom frame, the slide rail portion is located approximately in the middle between the two side frames, and the plane where the side frames are located is parallel to the direction in which the slide rail portion extends; the first mounting portion may include a cross beam of the side frame on one side of the slide rail portion or cross beams of the side frames on both sides of the slide rail portion.

[0009] According to another aspect of the present invention, one or more moving end brackets, which are detachably mounted on the second mounting portion of the reciprocating moving portion; and / or one or more fixed end brackets, which are detachably mounted on the first mounting portion.

[0010] According to another aspect of the present invention, the driving part includes a motor and a driving shaft, the motor is mounted at one end of the driving shaft and is preferably arranged at a position away from the base part and the reciprocating part, and the other end of the driving shaft extends below the reciprocating part.

[0011] According to another aspect of the present invention, the eccentric wheel is driven by a driving unit to rotate around the rotation axis, and the eccentric wheel of the eccentric wheel connecting rod mechanism is replaceable; or, the eccentric wheel is provided with a plurality of connecting rod mounting positions, and the distances of the connecting rod mounting positions relative to the rotation axis of the eccentric wheel are different to provide different moving distances.

[0012] According to another aspect of the present invention, it also includes a verification tool constructed based on the operating condition model of the cable under test, and the verification tool is used to install and position at least one of the fixed-end bracket and the movable-end bracket to ensure that the relative position requirements of the two brackets are consistent with the cable operating condition model.

[0013] In addition, the present invention also provides a method for testing cables using the cable testing device as described above, the method comprising: installing a fixed end bracket on a first mounting portion, and installing a movable end bracket on a second mounting portion; installing the two ends of the cable to be tested to the fixed end bracket and to the movable end bracket, respectively; connecting a voltage monitor to the cable to be tested, and monitoring the voltage of the cable to be tested in real time during the test of the testing device; collecting the voltage value measured by the voltage monitor, and judging whether the cable to be tested is damaged based on the collected voltage value.

[0014] According to another aspect of the present invention, it also includes: providing a verification tool constructed based on the operating condition model of the cable under test; using the verification tool to install at least one of the fixed-end bracket and the movable-end bracket to ensure that the relative positions of the fixed-end bracket and the movable-end bracket are consistent with the relative positions of the brackets determined in the operating condition model of the cable under test.

[0015] According to still another aspect of the present invention, the base portion and the reciprocating portion of the test device are placed in a temperature box, and the motor of the driving portion is placed outside the temperature box.

[0016] The test device according to the present invention adopts an eccentric wheel connecting rod mechanism, so that the reciprocating motion distance of the tested cable can be made consistent. In addition, by replacing the eccentric wheel, the test simulation of different motion distances of the moving cable can be easily realized.

[0017] In the present invention, a motion cable constructed based on three-dimensional modeling uses a working condition model to provide a verification tool, with the help of the verification tool it can be ensured that replacement of the fixed end bracket and the motion end bracket can highly simulate and restore the motion cable of different linear motions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] For a more complete understanding of the present invention, reference may be made to the following description of exemplary embodiments considered in conjunction with the accompanying drawings,

[0019] In the figure:

[0020] Figure 1 FIG. 1 is an overall perspective view of a cable testing device according to a preferred embodiment of the present invention.

[0021] Figure 2 A partial perspective view of a cable testing device according to a preferred embodiment of the present invention is shown.

[0022] Figure 3 A partially enlarged schematic diagram of an eccentric wheel connecting rod mechanism of a cable testing device according to a preferred embodiment of the present invention is shown.

[0023] Figure 4A partially enlarged stereoscopic view of a cable testing device according to a preferred embodiment of the present invention is shown, wherein an enlarged stereoscopic view of one end of a verification tool connected to a moving end adapter bracket is shown.

[0024] Figure 5 A partial perspective view of a cable testing device with a verification tool installed according to a preferred embodiment of the present invention is shown.

[0025] Figure 6 A schematic diagram showing voltage monitoring by a cable testing device according to a preferred embodiment of the present invention is shown.

[0026] Reference numerals list

[0027] 1. Test equipment

[0028] 10. Drive unit

[0029] 11 Motor

[0030] 12 Drive shaft

[0031] 20 base part

[0032] 21 bottom frame

[0033] 22 side frame

[0034] 23 Slide rail

[0035] 24 wheels

[0036] 25 Fixed end bracket

[0037] 30 Reciprocating unit

[0038] 31 Upper crossbeam

[0039] 32 Lower crossbeam

[0040] 35 sports end bracket

[0041] 40 eccentric wheel connecting rod mechanism

[0042] 41 eccentric wheel

[0043] 42 Connecting rod

[0044] 43 Sliding fixings

[0045] 45 Drive shaft

[0046] 50 verification tools

[0047] 51 Electrical connector

[0048] 61 Voltage Monitor

[0049] 62 Data Logger

[0050] 63 Computer

[0051] 65 Temperature Box

[0052] 70 Cable DETAILED DESCRIPTION

[0053] The present invention is further described below in conjunction with specific embodiments and drawings. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description herein. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0054] Figure 1 The whole stereogram of a cable test device 1 according to a preferred embodiment of the present invention is shown. The cable test device 1 comprises a driving part 10, a base part 20 and a reciprocating part 30, wherein the reciprocating part 30 is movably mounted to the base part 20, and the driving part 10 is configured to provide a driving force for the reciprocating movement of the reciprocating part 30. According to a preferred embodiment, the driving part 10 mainly comprises a motor 11 and a driving shaft 12, wherein the motor 11 is mounted at one end of the driving shaft 12 and is preferably arranged at a position away from the base part 20 and the reciprocating part 30, and the other end of the driving shaft 12 extends to the bottom of the reciprocating part 30. In addition, the cable test device 1 further comprises an eccentric wheel connecting rod mechanism 40, which is respectively connected to the reciprocating part 30 and the driving part 10, and is used to transmit the driving force of the driving part 10 to the reciprocating part 30 so that the reciprocating part 30 reciprocates according to a predetermined movement amount. In a preferred embodiment, the reciprocating movement is a linear reciprocating movement.

[0055] Further, if Figure 1 As shown, the base 20 is a frame structure. The frame structure of the base 20 mainly includes a bottom frame 21 and two side frames 22 vertically arranged upward from the sides of the bottom frame 21. The slide rail 23 is located approximately in the middle between the two side frames 22, and the plane where the side frames 22 are located is substantially parallel to the direction in which the slide rail 23 extends. Four wheels 24 are installed below the bottom frame 21 to facilitate the movement of the entire test device 1.

[0056] The base portion 20 has a first mounting portion for statically connecting the first end of the measured cable 70. Figure 1 As shown, in a preferred embodiment, the first mounting portion may include a crossbeam of the side frame 22 on one side of the slide rail portion 23 or crossbeams of the side frame 22 on both sides of the slide rail portion 23. However, the first mounting portion is not limited thereto, and other parts of the side frame 22 or the bottom frame 21 may also serve as the first mounting portion.

[0057] In a preferred embodiment, a fixed end bracket 25 is installed on the first mounting portion, and the first end of the measured cable 70 is installed to the first mounting portion of the base portion 20 by means of the fixed end bracket 25. In order to facilitate the installation of the fixed end bracket 25, a fastener connection hole can be preset at the first mounting portion, so that one or more fixed end brackets 25 can be installed on the first mounting portion by fasteners such as screws. In addition, the fixed end brackets 25 can be set on opposite sides of the base portion 20, and can be arranged symmetrically or asymmetrically. In other alternative embodiments, the fixed end bracket 25 can also be set as a part integrated with the first mounting portion.

[0058] In addition, if Figure 1 As shown, the base part 20 has a slide rail part 23, which is arranged in the base part 20 along the transverse direction parallel to the reciprocating direction of the test device 1, and is located at a substantially middle position of the base part 20 in the longitudinal direction (perpendicular to the transverse direction) along the short side of the base part 20. The slide rail part 23 extends parallel to the transverse direction. In other words, the slide rail part 23 is arranged so that the reciprocating moving part 30 reciprocates along the transverse direction. The sliding surface provided by the slide rail part 23 is at a certain height position above the bottom frame 21.

[0059] The reciprocating portion 30 of the test device 1 is slidably mounted on the slide rail portion 23, and the reciprocating portion 30 includes a pulley mating portion and a second mounting portion for attaching the second end of the tested cable 70. Figure 1 As shown, the reciprocating part 30 is also constructed as a frame structure, wherein the bottom of the frame structure is constructed as a slide rail matching part for matching with the slide rail part 23 of the base part 20. The second mounting part includes a beam extending in the reciprocating part 30 parallel to the transverse direction (ie, the sliding direction).

[0060] The second mounting portion is detachably mounted with a moving end bracket 35, and the second end of the tested cable 70 is mounted to the moving end bracket 35. In order to facilitate the installation of the moving end bracket 35, a fastener connection hole may be preset at the second mounting portion, so that one or more moving end brackets 35 are fixed to the reciprocating moving portion 30 by fasteners such as screws.

[0061] like Figure 2 As shown, the reciprocating portion 30 of the frame structure includes an upper crossbeam 31 and a lower crossbeam 32 parallel to the extension direction of the slide rail portion 23 but at different heights. The two crossbeams 31 and 32 at different heights constitute a second mounting portion that can provide different mounting heights, so as to simulate a variety of different cable usage conditions. It should be understood that the second mounting portion of the reciprocating portion 30 can include a larger number of rods at different heights and angles to provide a more flexible bracket installation.

[0062] Figure 2 and Figure 3It is a partial stereoscopic view of a cable testing device 1 according to a preferred embodiment of the present invention, in which an eccentric wheel connecting rod mechanism 40 for converting the rotational motion of the motor into translational motion along the slide rail portion 23 is shown. The eccentric wheel connecting rod mechanism 40 mainly includes an eccentric wheel 41, a sliding fixing member 43 and a connecting rod 42 respectively connecting the eccentric wheel 41 and the sliding fixing member 43. The eccentric wheel 41 is driven to rotate around the rotation axis by the driving shaft 12 of the driving portion 10 by means of a vertically arranged transmission shaft 45. One end of the connecting rod 42 is pivotally connected to the eccentric wheel 41 eccentrically relative to the central axis of rotation. The eccentric wheel 41 is mounted to the transmission shaft and the connection between the connecting rod 42 and the eccentric wheel 41 is detachable, so that the tester may selectively install a suitable eccentric wheel 41 according to the amount of movement of the moving end required for the test. As shown in FIG. Figure 3 As shown, a portion of the sliding fixing member 43 is fastened to the reciprocating moving portion 30, preferably, as shown in FIG. Figure 2 As shown, the connecting rod 42 is installed near one end of the reciprocating portion 30, and the other end of the connecting rod 42 is pivotally attached to a portion of the sliding fixing member extending perpendicularly to the lateral direction of the reciprocating portion 30. In this way, when the eccentric wheel 41 rotates around the rotation center axis driven by the motor, the connecting rod 42 rotates eccentrically therewith, and one end of the connecting rod 42 connected to the sliding fixing member 43 drives the sliding fixing member 43 to translate, thereby driving the reciprocating portion 30 to translate reciprocatingly and linearly along the slide rail portion 23.

[0063] In a preferred embodiment, the eccentric wheel 41 of the eccentric wheel connecting rod mechanism 40 is replaceable. In other alternative embodiments, the eccentric wheel may be provided with a plurality of connecting rod mounting positions, and the distances of the connecting rod mounting positions relative to the rotation axis of the eccentric wheel are different to provide different movement distances. Before the test, a suitable connection mounting position is selected to install the connection to provide different movement distances.

[0064] exist Figure 2 In the test device 1 shown, the first end of the tested cable 70 has been attached to the fixed end bracket 25 by a fastener, and the second end of the tested cable 70 will be connected to the moving end bracket 35. Figure 2 As shown, three fixed-end brackets 25 are fixed on the first mounting portion of the base portion 20. The three fixed-end brackets 25 are L-shaped brackets, and the bracket pieces at the horizontal position below them are fixed to the first mounting portion by fasteners, and the bracket pieces extending vertically are fixed to the first end of the tested cable 70. It should be understood that although three fixed-end brackets 25 are shown in the figure, more fixed-end brackets 25 can be arranged on the first mounting portion for synchronous testing of more cables 70.

[0065] Figure 2The moving end bracket 35 on the reciprocating moving part 30 is in the form of a rectangular sheet bracket, and one moving end bracket 35 is provided with mounting positions for the ends of three cables 70 to be tested, that is, three cables 70 to be tested can be installed through the electrical connector 51. Therefore, by using the test device 1 according to the present invention, the combination of the moving end bracket 35 and the fixed end bracket 25 can realize multiple groups of control tests of moving cables at different relative positions at the same time.

[0066] Typically, the moving end bracket 35 needs to be designed based on the shape of the electrical connector to be tested (circular / rectangular), the number of cables to be tested in the same batch, and the orientation of the connector relative to the direction of movement, and is installed on the mounting part of the test device 1 before the test; the fixed end bracket 25 is designed based on the fixing form and adjustable angle of the last fixed end of the cable 70 to be tested, and is installed on the mounting part of the test device 1 before the test.

[0067] In order to ensure that the installation orientation relationship between the moving end bracket 35 and the fixed end bracket 25 meets the test requirements, such as Figure 4 and Figure 5 As shown, a verification tool 50 is constructed based on the cable usage condition model. The verification tool 50 is made of 3D printing, for example. The verification tool 50 usually has a certain rigidity. The rigidity of the verification tool 50 is sufficient to ensure that the verification tool 50 does not deform when verifying the relative position between the fixed end bracket 25 and the movable end bracket 35. The verification tool 50 is used to install at least one of the fixed end bracket 25 and the movable end bracket 35 to ensure that the relative position requirements of the two brackets 25 and 35 are consistent with the cable usage condition model, so as to accurately simulate the actual usage condition of the cable 70.

[0068] Specifically, first install the fixed end bracket 25 to the first mounting part, then install the first end of the test tool 50 to the fixed end bracket 25 on the first mounting part, and then install the other end of the verification tool 50 to the movable end bracket 35 on the second mounting part through the electrical connector 51. Since the verification tool 50 is rigid, the position of the movable end bracket 35 on the second mounting part needs to be adjusted before it can be installed on the verification tool 50. Once the two brackets 25 and 35 are installed on the verification tool 50, the two brackets are tightened in place. At this time, the relative positions of the fixed end bracket 25 and the movable end bracket 35 are consistent with the cable usage condition model.

[0069] Figure 6 A schematic diagram showing voltage monitoring by a test device 1 according to a preferred embodiment of the present invention is shown.

[0070] One end of the test cable is connected to the voltage monitor 61 through the connector on the moving end adapter bracket, and the cable is connected to the voltage monitor 61 after being fixed at the fixed point of the fixed end bracket 25, thereby forming a loop. One end of the tested cable 70 is fixed, and the other end reciprocates on the slide rail 23 with the reciprocating beam. The voltage measurement monitoring recorder is further connected to data processing equipment such as a data acquisition instrument 62 and a computer 63.

[0071] During the test, one end of the cable moves back and forth with the reciprocating part 30, and the voltage monitor 61 monitors the voltage value of the test cable in real time and transmits it to the data acquisition instrument. The computer reads the voltage data in the data acquisition instrument and calculates the real-time resistance value of the test cable according to the formula to determine whether the test cable is damaged. When the real-time resistance value exceeds the set threshold, it means that the tested cable 70 may be damaged. At this time, the reciprocating movement of the reciprocating part 30 can be suspended. On the one hand, a DC resistance tester can be connected to the cable to measure the conductor and shielding layer resistance of the cable to determine whether there is a wire shielding layer damage and a wire core breakage in the test cable. On the other hand, an insulation resistance tester can be connected to the cable to measure the insulation resistance of the cable to determine whether there is a wire insulation layer damage in the cable.

[0072] In addition, during the test, the main body of the test device 1 including the base 20 and the reciprocating moving part 30 is placed in a temperature box to provide the temperature and related environmental conditions required for the test. The voltage monitor 61 is preferably arranged outside the temperature box, and the motor of the test device 1 can also be arranged outside the temperature box 65.

[0073] By using the test device 1 according to the present invention, the conductor, shielding layer and insulation resistance in the tested cable 70 can be regularly tested by real-time monitoring of voltage / resistance, thereby achieving real-time monitoring of the shielding layer continuity and conductor status of the tested cable 70.

[0074] Although the present invention is disclosed as above in terms of preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any changes and modifications made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall be deemed to be correct.

[0075] Any modifications, equivalent changes and modifications shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A cable testing device, comprising: A driving unit, the driving unit is used to provide driving force; A base portion, the base portion having a slide rail portion and a first mounting portion for mounting a first end of a cable under test; as well as a reciprocating portion, the reciprocating portion being slidably mounted on the slide rail portion and having a second mounting portion for mounting the second end of the tested cable; It is characterized in that An eccentric wheel connecting rod mechanism, the eccentric wheel connecting rod mechanism being arranged to interconnect the reciprocating moving part and the driving part, and comprising: An eccentric wheel, wherein the eccentric wheel is driven to rotate by the driving unit; a sliding fixing member connected to the reciprocating portion to drive the reciprocating portion to reciprocate along the slide rail portion; and A connecting rod, one end of which is connected to the eccentric wheel, and the other end of which is connected to the sliding fixing member.

2. The cable testing device according to claim 1, characterized in that: The second mounting portion of the reciprocating portion includes at least two cross beams, and the two cross beams are arranged at different heights and extend along the extension direction of the slide rail portion.

3. The cable testing device according to claim 1, characterized in that: The frame structure of the base portion mainly includes a bottom frame and two side frames vertically arranged upward from the sides of the bottom frame, the slide rail portion is located approximately in the middle between the two side frames, and the plane where the side frames are located is parallel to the direction in which the slide rail portion extends; The first mounting portion may include a cross beam of one or both of the two side frames.

4. The cable testing device according to claim 1, characterized in that: Also includes: One or more moving end brackets, wherein the moving end brackets are detachably mounted on the second mounting portion of the reciprocating moving portion; and / or One or more fixed end brackets, wherein the fixed end brackets are detachably mounted on the first mounting portion.

5. The cable testing device according to claim 1, characterized in that: The driving part includes a motor and a driving shaft. The motor is mounted on one end of the driving shaft located outside the base part, and the other end of the driving shaft extends to the bottom of the reciprocating part.

6. The cable testing device according to claim 1, characterized in that: The eccentric wheel of the eccentric wheel connecting rod mechanism is replaceable; or The eccentric wheel is provided with a plurality of connecting rod installation positions, and the distances of the connecting rod installation positions relative to the rotation axis of the eccentric wheel are different.

7. The cable testing device according to claim 1, characterized in that: It also includes a verification tool constructed based on the operating condition model of the cable under test, and the verification tool is used to install and position at least one of the fixed-end bracket and the movable-end bracket so that the relative position of the fixed-end bracket and the movable-end bracket is consistent with the relative position determined by the cable operating condition model.

8. A method for testing a cable using the cable testing device according to claim 1, the method comprising: Installing a fixed end bracket on the first mounting portion, and installing a moving end bracket on the second mounting portion; Installing two ends of the tested cable to the fixed end bracket and the moving end bracket respectively; Connecting a voltage monitor to the cable under test and monitoring the voltage of the cable under test in real time during the test by the test device; The voltage value measured by the voltage monitor is collected, and whether the tested cable is damaged is determined according to the collected voltage value.

9. The method for testing a cable according to claim 8, wherein: Also includes: Provide verification tools based on the working condition model of the tested cable; The verification tool is used to install at least one of the fixed end bracket and the movable end bracket to ensure that the relative position requirements of the two brackets are consistent with the usage condition model of the cable under test.

10. The method for testing a cable according to claim 8, wherein: The base portion and the reciprocating portion of the test device are placed in a temperature box, and the motor of the driving portion is placed outside the temperature box.

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