A cable abrasion testing apparatus and method

Abstract

The application relates to a cable wear resistance test device and a test method, which comprises a dynamic bending wear resistance test device, the dynamic bending wear resistance test device comprises a first mechanical arm, a second mechanical arm and a second driving mechanism, a guide mechanism for guiding the cable to move along the first mechanical arm in the axial direction is arranged on the first mechanical arm; the second mechanical arm is rotationally connected to the first mechanical arm through a wire harness base, and a first driving mechanism for driving the cable to move on the surface of the second mechanical arm in the axial direction of the second mechanical arm and away from the wire harness base is arranged on the second mechanical arm; a wire harness hole for the cable to pass through is formed in the wire harness base; the second driving mechanism is rotationally connected with the second mechanical arm and is used for driving the second mechanical arm to reciprocatingly rotate around the wire harness base. The application can evaluate the wear resistance of the cable under the dynamic bending state, the simulated test environment is relatively close to the actual vehicle cable use environment, and the application has high accuracy.

Description

Technical Field

[0001] This invention relates to the field of cable testing technology, and specifically to a cable abrasion resistance testing device and testing method. Background Technology

[0002] Because automobiles frequently operate in complex road environments, automotive cables are easily affected by vibration and friction, resulting in wear. Automotive cables operate in complex environments, constantly alternating between high and low temperatures, and varying humidity levels, resulting in different bending states. For example, engine wiring harnesses, exposed to high temperature and humidity for extended periods, are prone to wear. Besides engine wiring harnesses, the most vulnerable are headlight wiring harnesses, as those passing under the air filter are easily worn down by friction with the vehicle body. Some automotive cables, such as door cables, are in a dynamic bending state for extended periods, exhibiting different characteristics when rubbing against automotive parts. Therefore, it is necessary to examine the wear resistance of automotive cables under complex environments.

[0003] Regarding abrasion resistance testing of cables, existing automotive cable testing standards do not specify abrasion resistance testing methods that can assess the abrasion resistance performance of optical cables under high temperature, low temperature, high humidity, and low humidity environments. Furthermore, these methods cannot assess the abrasion resistance performance of optical cables under bending conditions. Moreover, this method is unsuitable for evaluating automotive optical cables, as it easily leads to excessive friction and reduces the accuracy of the test results. Additionally, this method cannot avoid the influence of sheath thickness on the cable abrasion resistance test, which has a negative impact on the market regulation of automotive cables.

[0004] Existing abrasion resistance testing standards for ordinary optical cables cannot differentiate between different optical cables in terms of abrasion resistance, nor can they quantify abrasion resistance. Similarly, these methods cannot evaluate the abrasion resistance of optical cables under high temperature, low temperature, high humidity, and low humidity conditions, nor can they evaluate the abrasion resistance of optical cables under bending conditions.

[0005] Given the actual usage environment of automotive optical cables, including high and low temperatures, high and low humidity, and various bending conditions, there is an urgent need to find suitable methods to examine the wear resistance of automotive cables under complex environments. Summary of the Invention

[0006] This application provides a cable abrasion resistance testing device and method, which can evaluate the abrasion resistance performance of cables under dynamic bending conditions. The simulated testing environment is close to the actual vehicle cable usage environment and has high accuracy.

[0007] In a first aspect, embodiments of this application provide a cable abrasion resistance testing device, which includes a dynamic bending abrasion resistance testing apparatus, the dynamic bending abrasion resistance testing apparatus comprising:

[0008] A first robotic arm, wherein the first robotic arm is provided with a guiding mechanism for guiding the cable to move along the axial direction of the first robotic arm;

[0009] The second robotic arm is rotatably connected to the first robotic arm via a wire harness base. The second robotic arm is provided with a first drive mechanism for driving the cable to move along the axis of the second robotic arm away from the wire harness base on the surface of the second robotic arm. The wire harness base is provided with a wire harness hole for the cable to pass through.

[0010] The second drive mechanism is rotatably connected to the second robotic arm and is used to drive the second robotic arm to reciprocate around the wire harness base.

[0011] In conjunction with the first aspect, in one embodiment, the guiding mechanism includes a tube, the outer wall of which is fixed to the first robotic arm, or the tube is sleeved on the outside of the first robotic arm.

[0012] In conjunction with the first aspect, in one embodiment, the guiding mechanism includes a cable groove formed on the first robotic arm and an anti-detachment component provided at the opening of the cable groove.

[0013] In conjunction with the first aspect, in one embodiment, the first driving mechanism includes:

[0014] Multiple pulleys;

[0015] A belt, which is fitted onto all the pulleys, and a channel is formed between the belt and the second robotic arm for cables to pass through;

[0016] An air pump is connected to the belt and is used to inflate or deflate the belt.

[0017] An electric motor is connected to the pulley and is used to drive the pulley to rotate so that the belt drives the cable to move.

[0018] In conjunction with the first aspect, in one embodiment, the end of the second robotic arm away from the wire harness base is provided with a baffle for blocking the cable.

[0019] In conjunction with the first aspect, in one embodiment, the cross-section of the wire harness hole is fan-shaped, triangular, or quadrilateral.

[0020] In conjunction with the first aspect, in one embodiment, the second robotic arm rotates at an angle of 0 ≤ θ < 180°.

[0021] In conjunction with the first aspect, in one embodiment, the cable abrasion resistance testing equipment further includes a static bending abrasion resistance testing device in the same plane, the static bending abrasion resistance testing device in the same plane comprising:

[0022] A friction mechanism, comprising a first friction table and a third drive mechanism, wherein the third drive mechanism is connected to the first friction table and is used to drive the first friction table to move in a horizontal plane;

[0023] The load mechanism includes a load and a fourth drive mechanism, the fourth drive mechanism being connected to the load and used to drive the load closer to or away from the first friction table to clamp or release the cable.

[0024] A cable locking mechanism, comprising two locking clamps for fixing both ends of a cable, the two locking clamps being spaced apart.

[0025] In conjunction with the first aspect, in one embodiment, the load is further connected to a pressure sensor for measuring the magnitude of the pressure applied to the cable.

[0026] In conjunction with the first aspect, in one embodiment, a friction contact plate is provided on the wall surface of the load facing the first friction table.

[0027] In conjunction with the first aspect, in one embodiment, the friction contact piece is provided with a corrugated matrix, a dotted protrusion matrix, or a sawtooth matrix.

[0028] In conjunction with the first aspect, in one embodiment, the cable locking mechanism further includes a fifth drive mechanism connected to the locking clamp and used to drive the locking clamp closer to or further away from another locking clamp.

[0029] In conjunction with the first aspect, in one embodiment, the abrasive grain size on the friction surface of the first friction table is 1100-1200 / cm. 2 .

[0030] In conjunction with the first aspect, in one embodiment, the cable abrasion resistance testing equipment further includes a static bending abrasion resistance testing device for different planes, the static bending abrasion resistance testing device for different planes comprising:

[0031] There are two first friction platforms, and the two first friction platforms are at different heights;

[0032] The second friction platform is connected between the two first friction platforms, and the second friction platform is provided with a path limiting component for limiting the routing of the cable.

[0033] The load mechanism includes a load and a fourth drive mechanism, the fourth drive mechanism being connected to the load and used to drive the load closer to or away from the first friction table to clamp or release the cable.

[0034] The tensioning mechanism is located on the first friction table and is used to tension the cable.

[0035] In conjunction with the first aspect, in one embodiment, the path limiting component includes a plurality of columns disposed on the friction surface of the second friction table.

[0036] In conjunction with the first aspect, in one embodiment, the first friction table is further provided with a cable limiting member, which is disposed between the tensioning mechanism and the load.

[0037] In conjunction with the first aspect, in one embodiment, the cable abrasion resistance testing equipment further includes a testing chamber, wherein a temperature control unit and / or a humidity control unit are provided in the testing chamber.

[0038] Secondly, embodiments of this application provide a cable abrasion resistance testing method, which includes the following steps:

[0039] Take a section of the cable to be tested and weigh its mass m0 before friction.

[0040] The cable is mounted on the guide mechanism of the dynamic bending abrasion test device of the cable abrasion test equipment as described above;

[0041] After the cable is passed through the wire harness hole of the wire harness base, it is placed between the first drive mechanism and the second robotic arm;

[0042] The second robotic arm is driven to reciprocate around the wire harness base to repeatedly bend the cable. When the second robotic arm is driven to rotate to bend the cable, the first drive mechanism drives the cable to move away from the wire harness base along the axis of the second robotic arm.

[0043] After a set number of reciprocating rotations, the mass m1 of the cable after friction is measured.

[0044] Based on m0, m1, and the cross-sectional area of ​​the cable outer sheath, the abrasion resistance value of the cable under dynamic bending is obtained.

[0045] Thirdly, embodiments of this application provide a cable abrasion resistance testing method, which includes the following steps:

[0046] Take a section of the cable to be tested and weigh its mass m0 before friction.

[0047] The cable is placed on the first friction table of the static bending abrasion resistance test device on the same plane as described above, and both ends of the cable are fixed on the two locking clamps respectively.

[0048] Apply the load to the cable;

[0049] The first friction table is driven to move in order to rub the cable;

[0050] After a set number of friction cycles, the mass m1 of the cable after friction is measured.

[0051] Based on m0, m1 and the cross-sectional area of ​​the cable outer sheath, the abrasion resistance value of the cable under static bending in the same plane is obtained.

[0052] Fourthly, embodiments of this application provide a cable abrasion resistance testing method, which includes the following steps:

[0053] Take a section of the cable to be tested and weigh its mass m0 before friction.

[0054] The cable is placed on different plane static bending abrasion resistance testing devices of the cable abrasion resistance testing equipment as described above;

[0055] The cable is routed around the path limiting component of the second friction table, and a load is applied to the cable;

[0056] Tension the cable to abrade it;

[0057] After a set number of friction cycles, the mass m1 of the cable after friction is measured.

[0058] Based on m0, m1 and the cross-sectional area of ​​the cable outer sheath, the abrasion resistance value of the cable under static bending in different planes is obtained.

[0059] The beneficial effects of the technical solutions provided in this application include at least the following:

[0060] This application provides a cable abrasion resistance testing device, whose dynamic bending abrasion resistance testing device can evaluate the abrasion resistance performance of cables under dynamic bending conditions. The simulated testing environment is close to the actual vehicle cable usage environment and has high accuracy. Attached Figure Description

[0061] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0062] Figure 1 A schematic diagram of the dynamic bending abrasion resistance testing device provided in the embodiments of this application;

[0063] Figure 2 This is a schematic diagram of a wire harness base provided in an embodiment of this application;

[0064] Figure 3This is a schematic diagram of the assembly of the first drive mechanism and the second robotic arm provided in an embodiment of this application;

[0065] Figure 4 Top view of the static bending abrasion resistance testing device in the same plane provided in the embodiments of this application;

[0066] Figure 5 A front view of the static bending abrasion resistance testing device in the same plane provided in the embodiments of this application;

[0067] Figure 6 Schematic diagrams of different planar static bending abrasion resistance testing devices provided in the embodiments of this application.

[0068] In the diagram: 1. First robotic arm; 2. Cable; 3. Guiding mechanism; 4. Second robotic arm; 5. Wire harness base; 6. First drive mechanism; 7. Wire harness hole; 8. Second drive mechanism; 9. Pulley; 10. Belt; 11. Baffle; 12. First friction table; 13. Third drive mechanism; 14. Load; 15. Fourth drive mechanism; 16. Locking clamp; 17. Pressure sensor; 18. Friction contact plate; 19. Second friction table; 20. Tensioning mechanism; 21. Column; 22. Cable limiting component; 23. Test chamber; 24. Temperature control unit; 25. Humidity control unit. Detailed Implementation

[0069] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0070] For applications involving cables in dynamic bending states, such as acute and obtuse angle bending conditions in car doors and trunks, please refer to [link / reference]. Figure 1 , Figure 2 and Figure 3As shown in the figure, this application provides a cable abrasion resistance testing device, which includes a dynamic bending abrasion resistance testing device. The dynamic bending abrasion resistance testing device includes a first robotic arm 1, a second robotic arm 4, and a second driving mechanism 8. The first robotic arm 1 is provided with a guiding mechanism 3 for guiding the cable 2 to move along the axial direction of the first robotic arm 1. The second robotic arm 4 is rotatably connected to the first robotic arm 1 through a wire harness base 5. The second robotic arm 4 is provided with a first driving mechanism 6 for driving the cable 2 to move along the axial direction of the second robotic arm 4 away from the wire harness base 5 on the surface of the second robotic arm 4. The wire harness base 5 is provided with a wire harness hole 7 for the cable 2 to pass through. The second driving mechanism 8 is rotatably connected to the second robotic arm 4 and is used to drive the second robotic arm 4 to reciprocate around the wire harness base 5.

[0071] The dynamic bending abrasion resistance testing device provided in this application embodiment has two robotic arms, wherein the second robotic arm 4 can rotate relative to the first robotic arm 1 to simulate the repeated bending process when opening and closing car doors, trunk doors, etc.

[0072] A guide mechanism 3 is provided on the first robotic arm 1. When the cable 2 passes through the first robotic arm 1, the guide mechanism 3 guides the cable 2 to move along the axis of the first robotic arm 1 instead of fixing it. This can simulate the normal back-and-forth movement of the cable 2 on the surface of the parts it contacts during the opening and closing process of car doors, trunk doors, etc.

[0073] After passing through the first robotic arm 1, cable 2 passes through the wire harness hole 7 of the wire harness base 5 instead of winding around the surface of the wire harness base 5. This is to simulate the scenario in real car doors, trunk doors, etc., where cable 2 passes through the wire harness base 5 and rubs back and forth on the inner surface of the wire harness base 5 during the opening and closing process.

[0074] After cable 2 passes through the wire harness hole 7, it then passes through the second robotic arm 4. During the process of the second robotic arm 4 rotating to bend cable 2 (e.g., Figure 1 The second robotic arm 4 rotates from position A to position B. Using the first drive mechanism 6, the cable 2 is driven to move along the axis of the second robotic arm 4 away from the wire harness base 5 on the surface of the second robotic arm 4. During this process, the cable 2 not only rubs against the surface of the second robotic arm 4 under the action of the first drive mechanism 6, but also rubs against the inner surface of the wire harness base 5 when it bends because the cable 2 passes through the wire harness base 5. This forms a dynamic bending and friction superposition process, which is more in line with the actual state of the cable when opening and closing car doors, trunk doors, etc.

[0075] As can be seen, the cable abrasion resistance testing equipment provided in this application embodiment can evaluate the abrasion resistance performance of cables under dynamic bending conditions. The simulated test environment is close to the actual vehicle cable usage environment and has high accuracy.

[0076] It should be noted that the above-mentioned cables include not only optical cables, but also electrical cables, etc.

[0077] For applications involving cables under dynamic bending conditions, such as acute and obtuse angles in car doors and trunk doors, this application also provides a cable abrasion resistance testing method. This testing method is implemented using a dynamic bending abrasion resistance testing device and includes the following steps:

[0078] 101: Take a section of the cable to be tested 2 and weigh its mass m0 before friction.

[0079] 102: The cable 2 is placed on the guide mechanism 3 of the dynamic bending abrasion resistance test device.

[0080] 103: After the cable 2 is passed through the wire harness hole 7 of the wire harness base 5, it is placed between the first drive mechanism 6 and the second robotic arm 4.

[0081] 104: Drive the second robotic arm 4 to reciprocate around the wire harness base 5 so that the cable 2 bends repeatedly, and when the second robotic arm 4 is driven to rotate so that the cable 2 bends, the first drive mechanism 6 drives the cable 2 to move away from the wire harness base 5 along the axis of the second robotic arm 4.

[0082] See Figure 1 As shown, the second drive mechanism 8 drives the second robotic arm 4 to swing from position B with the cable to position A, and then from position A to position B, so that the cable repeatedly rubs against each other and moves back and forth from position B to position A to position B once, which is recorded as one reciprocating rotation.

[0083] During the swing from position A to position B, the first drive mechanism 6 drives the cable 2 to move along the axis of the second robotic arm 4 away from the wire harness base 5, simulating the bending state of the cable 2 when a car door, trunk door, or other door is opened.

[0084] 105: After a set number of reciprocating rotations, weigh the mass m1 of the cable 2 after friction.

[0085] 106: Based on m0, m1 and the cross-sectional area S of the cable outer sheath, the abrasion resistance value of the cable is obtained. Obviously, the abrasion resistance value of the cable is the abrasion resistance value under dynamic bending.

[0086] The abrasion resistance value of the cable is A = (m0 - m1) / S.

[0087] Wherein, the mass m0 before friction is in g, the mass m1 after friction is in g, and the cross-sectional area S of the cable outer sheath is in m³. 2 The cable abrasion resistance value A is expressed in g / m. 2 .

[0088] The cross-sectional area S of the cable outer sheath is calculated as follows:

[0089]

[0090] The cable outer diameter D is in meters (m), and the cable outer sheath thickness h is in meters (m).

[0091] This method uses the mass loss per unit area before and after cable friction to evaluate the abrasion resistance of the cable, avoiding the influence of the cable outer sheath thickness, and can effectively perform qualitative and quantitative analysis of the cable abrasion resistance.

[0092] Furthermore, the abrasion resistance value of this method is closely related to the outer diameter of the cable and the thickness of the outer sheath, which can better reflect the correlation between the abrasion resistance value and the outer diameter of the cable and the thickness of the outer sheath.

[0093] Understandably, multiple samples can be taken, repeated tests can be conducted, and the average value can be taken to reduce the error in the cable abrasion resistance value.

[0094] In order to guide the cable 2, this application provides an implementation scheme for the guiding mechanism 3. For example, the guiding mechanism 3 includes a cable groove opened on the first robotic arm 1 and an anti-detachment component provided at the opening of the cable groove. The cable groove extends along the axial direction of the first robotic arm 1. Multiple anti-detachment components can be provided. The anti-detachment components can be rubber bands or tapes wrapped on the first robotic arm 1.

[0095] For example, the guiding mechanism 3 includes a tube, the outer wall of which is fixed to the first robotic arm 1, or the tube is sleeved on the outside of the first robotic arm 1, and the cable 2 passes through the tube.

[0096] To achieve the purpose of driving cable 2 to move, see Figure 3 As shown, the first drive mechanism 6 includes multiple pulleys 9, a belt 10, an air pump, and a motor. The belt 10 is fitted onto all the pulleys 9, and a channel for the cable 2 to pass through is formed between the belt 10 and the second robotic arm 4. The air pump is connected to the belt 10 and is used to inflate or deflate the belt 10. The motor is connected to the pulleys 9 and is used to drive the pulleys 9 to rotate, so that the belt 10 drives the cable 2 to move.

[0097] By inflating the belt 10 with an air pump, the cable 2 can be pressed onto the second robotic arm 4 using the belt 10. On the other hand, the motor can drive the pulley 9 to rotate, thereby driving the belt 10 to move the cable 2.

[0098] Multiple motors can be set, and each motor drives a pulley 9 to rotate.

[0099] It is understandable that, for cables 2 with different outer diameters, since the belt 10 can be inflated and deflated, the size of the channel formed between the belt 10 and the second robotic arm 4 can be adjusted by the amount of air inflated.

[0100] It should be noted that, as Figure 1 As shown, when a car door, trunk door, or other opening mechanism causes cable 2 to bend, cable 2 will move along the axis of the second robotic arm 4 away from the wire harness base 5. Similarly, when closing the door, cable 2 may also move along the axis of the second robotic arm 4 towards the wire harness base 5. Therefore, to more realistically simulate the bending state of cable 2 when a car door, trunk door, or other opening and closing mechanism is used, see [reference needed]. Figure 1 As shown, during the swing from position B to position A, the air pressure of belt 10 is unloaded, the motor is powered off and does not work, and friction is generated when cable 2 naturally moves towards the wire harness base 5.

[0101] As can be seen, in this application, cable 2 moves simultaneously during the reciprocating bending process. The high pressure of belt 10 fixes cable 2 to the second robotic arm 4, while the rotation of pulley 9 under the belt causes belt 10 to pull cable 2 away from the wire harness base 5, generating friction between cable 2 and the wire harness base 5. Simultaneously, cable 2 bends on the wire harness base 5, resulting in a superimposed process of dynamic bending and friction. During the return of the second robotic arm 4 from position B to position A, the air pressure on belt 10 is uniformly reduced to 0, and cable 2 naturally moves towards the wire harness base 5, again generating friction between cable 2 and the wire harness base 5, thus creating another superimposed process of dynamic bending and friction. The above process simulates the actual state of cable 2 when a car door, trunk door, or similar opening and closing mechanism is used.

[0102] Further, see Figure 3As shown, the end of the second robotic arm 4 furthest from the wire harness base 5 is equipped with a baffle 11 to block the cable 2. When the second robotic arm 4 moves from position A to position B, the belt 10 pulls the cable 2 away from the wire harness base 5. Due to the presence of the baffle 11, the cable 2 accumulates between the belt 10 and the baffle 11, causing it to bend. During this process, the cable 2 rubs against the second robotic arm 4, resulting in a combined bending and friction process. Conversely, when the second robotic arm 4 moves from position B to position A, the air pressure on the belt 10 is unloaded, and the accumulated, bent cable 2 gradually returns to a straight state. During this process, the cable 2 rubs against the second robotic arm 4, again resulting in a combined bending and friction process. This realistically simulates the state of the cable 2 in a closed installation environment similar to the presence of the baffle 11.

[0103] Understandably, a control device can be used to control the second drive mechanism 8 to drive the second robotic arm 4 to rotate; the control device can also control the air pump to inflate and deflate the belt 10; and the control device can control the motor to drive the belt 10 to pull the cable 2 away from the wire harness base 5. Similarly, using the control device to coordinate, when the second robotic arm 4 moves from position A to position B, the belt 10 is inflated and the motor is controlled to work, driving the belt 10 to pull the cable 2 away from the wire harness base 5. Conversely, when the second robotic arm 4 moves from position B to position A, the belt 10 is inflated and deflated, and the motor is controlled to stop working.

[0104] The wire harness base 5 can be circular or square, and consists of several wire harness holes 7 in the center. The cross-section of the wire harness holes 7 is fan-shaped, triangular, or quadrilateral, allowing the cable 2 to pass through the center and forming a friction unit during the repeated bending process of the cable 2. The material of the wire harness base 5 can be plastic, rubber, or other common automotive polymer materials.

[0105] The rotation angle θ of the second robotic arm 4 can be determined according to actual needs. For example, the rotation angle of the second robotic arm 4 is 0≤θ<180°.

[0106] For applications operating on the same plane, the cable abrasion resistance testing equipment also includes a static bending abrasion resistance testing device on the same plane, see [link / reference]. Figure 4 and Figure 5As shown, the static bending abrasion resistance testing device in the same plane includes a friction mechanism, a load mechanism, and a cable locking mechanism. The friction mechanism includes a first friction platform 12 and a third drive mechanism 13. The third drive mechanism 13 is connected to the first friction platform 12 and is used to drive the first friction platform 12 to move in the horizontal plane. The load mechanism includes a load 14 and a fourth drive mechanism 15. The fourth drive mechanism 15 is connected to the load 14 and is used to drive the load 14 to move closer to or away from the first friction platform 12 to clamp or release the cable 2. The cable locking mechanism includes two locking clamps 16 for fixing both ends of the cable 2, and the two locking clamps 16 are spaced apart.

[0107] Two locking clips 16 can be used to fix both ends of the cable 2, thereby making the cable 2 bend. The bent cable 2 is then clamped between the load 14 and the first friction table 12.

[0108] The load 14 can be positioned above or below the first friction table 12.

[0109] The fourth drive mechanism 15 is used to drive the load 14 close to the first friction table 12, thereby applying pressure to the cable 2 which is in a bent state.

[0110] The third drive mechanism 13 is used to drive the first friction table 12 to move in the horizontal plane, thereby rubbing the cable 2.

[0111] The third drive mechanism 13 can drive the first friction table 12 to move in multiple directions.

[0112] For example, with Figure 4 Taking orientation as an example, the third drive mechanism 13 can use its telescopic drive shaft to drive the first friction table 12 to move left and right. At this time, the telescopic drive shaft extends and retracts, which is recorded as one friction.

[0113] For example, the third drive mechanism 13 can use its telescopic drive shaft to drive the first friction table 12 to move back and forth (i.e., Figure 4 (The vertical movement in the middle), at which time the telescopic drive shaft extends and retracts, is recorded as one friction cycle.

[0114] For example, the third drive mechanism 13 includes two drives. The telescopic drive shaft of one drive is connected to the first friction table 12 to drive the first friction table 12 to move left and right; the telescopic drive shaft of the other drive is connected to the first drive to drive the first drive and the first friction table 12 to move back and forth as a whole (i.e., Figure 4 (Up and down movement in the middle), at this time the first friction table 12 completes left and right movement and forward and backward movement, which is recorded as one friction.

[0115] The distance that the first friction table 12 moves can be determined according to actual needs.

[0116] For applications where cables are in the same plane, this application also provides a cable abrasion resistance testing method. This method is implemented using a static bending abrasion resistance testing device in the same plane, and includes the following steps:

[0117] 201: Take a section of the cable to be tested 2 and weigh its mass m0 before friction.

[0118] 202: Place the cable 2 on the first friction table 12 and fix both ends of the cable 2 on the two locking clamps 16 respectively.

[0119] 203: Apply load 14 to the cable 2.

[0120] 204: Drive the first friction table 12 to move so as to rub the cable 2.

[0121] 205: After the set number of friction cycles, weigh the mass m1 of the cable 2 after friction.

[0122] 206: Based on m0, m1 and the cross-sectional area of ​​the cable outer sheath, the abrasion resistance value of the cable is obtained. This abrasion resistance value is the abrasion resistance value under static bending in the same plane.

[0123] The abrasion resistance value of the cable is A = (m0 - m1) / S.

[0124] Wherein, the mass m0 before friction is in g, the mass m1 after friction is in g, and the cross-sectional area S of the cable outer sheath is in m³. 2 The cable abrasion resistance value A is expressed in g / m. 2 .

[0125] The cross-sectional area S of the cable outer sheath is calculated as follows:

[0126]

[0127] The cable outer diameter D is in meters (m), and the cable outer sheath thickness h is in meters (m).

[0128] This method uses the mass loss per unit area before and after cable friction to evaluate the abrasion resistance of the cable, avoiding the influence of the cable outer sheath thickness, and can effectively perform qualitative and quantitative analysis of the cable abrasion resistance.

[0129] Furthermore, the abrasion resistance value of this method is closely related to the outer diameter of the cable and the thickness of the outer sheath, which can better reflect the correlation between the abrasion resistance value and the outer diameter of the cable and the thickness of the outer sheath.

[0130] Understandably, multiple samples can be taken, repeated tests can be conducted, and the average value can be taken to reduce the error in the cable abrasion resistance value.

[0131] For easy adjustment of the load capacity, please refer to [link / reference]. Figure 5 As shown, the load 14 is also connected to a pressure sensor 17 for measuring the pressure applied to the cable 2.

[0132] To prevent cable 2 from moving during the friction process, see Figure 5 As shown, a friction contact piece 18 is provided on the wall surface of the load 14 facing the first friction table 12. The friction contact piece 18 is provided with a corrugated matrix, a dotted protrusion matrix or a sawtooth matrix, the purpose of which is to strengthen the fixation of the cable 2 in the bending state, so that it cannot move arbitrarily in the friction state.

[0133] In order to adjust the bending degree of cable 2, the cable locking mechanism also includes a fifth drive mechanism, which is connected to the locking clamp 16 and is used to drive the locking clamp 16 closer to or further away from another locking clamp 16.

[0134] The first friction platform 12 can be made of garnet, and the abrasive grain size on its friction surface is 1100-1200 / cm. 2 .

[0135] For applications involving sharp-angle joints and bending in different planes, the cable abrasion resistance testing equipment also includes a static bending abrasion resistance testing device for different planes, see [link / reference]. Figure 6 As shown, the static bending abrasion resistance testing device for different planes includes two first friction platforms 12, a second friction platform 19, a load mechanism, and a tensioning mechanism 20. The two first friction platforms 12 have different heights. The second friction platform 19 is connected between the two first friction platforms 12. The second friction platform 19 is equipped with a path limiting component for limiting the routing of the cable 2. The load mechanism is located above the first friction platforms 12. Each first friction platform 12 is equipped with a load mechanism, which includes a load 14 and a fourth drive mechanism 15. The fourth drive mechanism 15 is connected to the load 14 and is used to drive the load 14 to approach or move away from the first friction table 12 to clamp or release the cable 2. The tensioning mechanism 20 is located on the first friction table 12 and is used to tension the cable 2. The tensioning mechanisms 20 on the two first friction tables 12 cooperate with each other to achieve back-and-forth tensioning. For example, after one tensioning mechanism 20 tensions in one direction, the other tensioning mechanism 20 tensions in the opposite direction. Each tensioning mechanism 20 tensions once, which is counted as one friction. The tensioning distance of the cable 2 can be determined according to actual needs.

[0136] See Figure 6 As shown, the path limiting component includes a plurality of columns 21 disposed on the friction surface of the second friction table 19.

[0137] The column 21 is used to limit the path of the cable 2, which can realize the cable 2 in different bending states.

[0138] The friction tables can be at obtuse angles, acute angles, etc.

[0139] Depending on the actual testing needs, friction tables can be added to different planar static bending abrasion resistance testing devices, which will not be elaborated here.

[0140] Uneven friction tables can be arranged in different shapes, such as concave, convex, and Z-shaped.

[0141] See Figure 6 As shown, a cable limiting member 22 is also provided on the first friction table 12, and the cable limiting member 22 is disposed between the tensioning mechanism 20 and the load 14. For example, the cable limiting member 22 can be made of adhesive, etc., and its purpose is to make the cable 2 run in a predetermined direction, for example, see [reference needed]. Figure 6 As shown, on the first friction platform 12 with a higher height, the cable limiting member 22, the tensioning mechanism 20 and the load 14 are in a straight line, and the cable 2 also runs in a straight line. On the first friction platform 12 with a lower height, the cable limiting member 22, the tensioning mechanism 20 and the load 14 cause the cable 2 to run in a curved shape.

[0142] See Figure 4 and Figure 5 As shown, the cable abrasion resistance testing equipment also includes a test chamber 23, in which a temperature control unit 24 and / or a humidity control unit 25 are provided.

[0143] The dynamic bending abrasion resistance test device, the same-plane static bending abrasion resistance test device, and the different-plane static bending abrasion resistance test device can all be placed in the test chamber 23. Using the temperature control unit 24 and / or humidity control unit 25, the temperature and / or humidity environment of the actual vehicle-mounted cable operation can be simulated.

[0144] For applications involving cables with sharp-angle joints and bending on different planes, this application also provides a cable abrasion resistance testing method. This method is implemented using a static bending abrasion resistance testing device on different planes, and specifically includes the following steps:

[0145] 301: Take a section of the cable to be tested 2 and weigh its mass m0 before friction.

[0146] 302: Place the cable 2 on a static bending abrasion resistance test device with different planes.

[0147] 303: The cable 2 is routed around the path limiting component of the second friction table 19, and the load 14 is applied to the cable 2.

[0148] 304: Tension the cable 2 to rub the cable 2.

[0149] 305: After the set number of friction cycles, weigh the mass m1 of the cable 2 after friction.

[0150] 306: Based on m0, m1 and the cross-sectional area of ​​the cable outer sheath, the abrasion resistance value of the cable is obtained. This abrasion resistance value is the abrasion resistance value under static bending in different planes.

[0151] The abrasion resistance value of the cable is A = (m0 - m1) / S.

[0152] Wherein, the mass m0 before friction is in g, the mass m1 after friction is in g, and the cross-sectional area S of the cable outer sheath is in m³. 2 The cable abrasion resistance value A is expressed in g / m. 2 .

[0153] The cross-sectional area S of the cable outer sheath is calculated as follows:

[0154]

[0155] The cable outer diameter D is in meters (m), and the cable outer sheath thickness h is in meters (m).

[0156] This method uses the mass loss per unit area before and after cable friction to evaluate the abrasion resistance of the cable, avoiding the influence of the cable outer sheath thickness, and can effectively perform qualitative and quantitative analysis of the cable abrasion resistance.

[0157] Furthermore, the abrasion resistance value of this method is closely related to the outer diameter of the cable and the thickness of the outer sheath, which can better reflect the correlation between the abrasion resistance value and the outer diameter of the cable and the thickness of the outer sheath.

[0158] Understandably, multiple samples can be taken, repeated tests can be conducted, and the average value can be taken to reduce the error in the cable abrasion resistance value.

[0159] In summary, this method and device can simulate the abrasion resistance of cables under complex conditions (high and low temperatures, humidity, and bending conditions), and the simulated environment is quite close to the actual usage environment of vehicle-mounted cables.

[0160] This method can not only qualitatively assess the abrasion resistance of cables, but also quantitatively. It can distinguish the differences in abrasion resistance among different cables and is suitable for automotive cables with varying abrasion resistance requirements in different areas of a car.

[0161] This method eliminates the influence of sheath thickness on cable abrasion resistance and uses the mass reduction before and after friction to evaluate cable abrasion resistance. It can provide better reference for cable material selection and preparation and standardize market products.

[0162] Example 1

[0163] This embodiment examines the abrasion resistance of automotive optical cables under dynamic bending conditions at acute and obtuse angles, such as in car doors. It is known that the front door of a car is a low-temperature, humid region, and the front door wiring harness forms a 90° angle when the door is closed and nearly a 180° angle when the door is fully open. During the opening and closing process, the optical cable and the car body plastic components, such as the wiring harness base, experience repeated abrasion under obtuse angle bending. The rear door is a low-temperature, dry region, and the rear door wiring harness forms a 180° angle when the door is closed and nearly a 90° angle when the door is fully open. During the opening and closing process, the optical cable and the car body plastic components experience repeated abrasion under obtuse angle bending.

[0164] The specific testing method is as follows:

[0165] When simulating and examining the wear resistance of the wiring harness of the front door of a car, in this embodiment, the temperature control unit controls the temperature at 20°C and the humidity control unit controls the humidity at 80% to simulate a low-temperature and humid environment.

[0166] 1) Take a 100cm long section of the optical cable to be tested, with an initial mass of m0.

[0167] 2) The optical cable under test is installed on the first robotic arm 1 through the guide mechanism 3, passes through the wire harness base 5, and is fixed on the second robotic arm 4 through the first drive mechanism 6;

[0168] 3) The first robotic arm 1 is fixed, and the second robotic arm 4 is initially located at position B. Then, the second robotic arm 4 carries the optical cable and swings from position B to position A at a constant speed, and then swings from position A to position B at the same speed. That is, the second robotic arm 4 swings back and forth between position B and position A, and the optical cable and the wire harness base are repeatedly rubbed in a 90°-180° bending state.

[0169] 4) Swinging back and forth from position B to position A to position B is counted as one friction cycle. When the swinging friction reaches 100 cycles, stop the test, remove the optical cable, and weigh it m1. Record the weight reduction of the optical cable as m0-m1.

[0170] 5) Take another 4 sets of optical cables, repeat the test, record the weight reduction of each set, take the average of the 5 sets of data, and calculate the wear resistance value A according to the formula mentioned above.

[0171] The abrasion resistance of three types of optical cables (a, b, and c) was tested using this method. The results were as follows: Optical cable a cracked its outer sheath after 56 cycles of dynamic bending and friction; optical cable b twisted and cracked after 100 cycles of dynamic bending and friction; and optical cable c's outer sheath remained intact after 100 cycles of dynamic bending and friction, with no impact on its optical performance and an abrasion resistance value of 3.67 g / m. 2 Therefore, C-type optical cable has better abrasion resistance than A-type and B-type optical cables.

[0172] When simulating the wear resistance of the rear door wiring harness of a car, in this embodiment, the temperature control unit controls the temperature at 20°C and the humidity control unit controls the humidity at 30% to simulate a low-temperature dry environment. The method is largely the same as the front door wiring harness testing method described above. The difference is that the initial position of the second robotic arm 4 is at position A. Then, the second robotic arm 4, carrying the optical cable, swings uniformly from position A to position B, and then swings back from position B to position A at the same speed. That is, the second robotic arm 4 swings back and forth between position A and position B, and the optical cable and the wiring harness base are repeatedly rubbed in a 180°-90° bending state.

[0173] When simulating other automotive usage scenarios with sharp angles, i.e., when the cable ends are at acute angles of 0°-90°, the method is mostly the same as the above-mentioned door wiring harness test method. The difference is that the mechanical swing arm swings back and forth between position A and position B, and the optical cable and the wiring harness base are repeatedly rubbed in a bending state of 0°-90° or 90°-0°.

[0174] Example 2

[0175] This embodiment is used to examine the abrasion resistance of vehicle-mounted optical cables used in high-temperature and high-humidity environments, such as automobile engines.

[0176] In this embodiment, the bending radius of the optical cable is 50D.

[0177] In this embodiment, the temperature control unit controls the temperature at 120°C, and the humidity control unit controls the humidity at 80%. The load is controlled at 9.8N.

[0178] The bottom of the friction contact plate under load has a regular corrugated shape, which is intended to strengthen the fixation of the optical cable under bending conditions and prevent it from moving arbitrarily under friction.

[0179] The first friction table 12 is composed of garnet, and the abrasive grain size is 1160 / cm. 2 .

[0180] The specific testing method is as follows:

[0181] 1) Record the initial mass m0 of a 76cm long section of the optical cable to be tested;

[0182] 2) The two locking clamps 16 fix the two ends of the optical cable to be tested. The two locking clamps 16 move relative to each other to reduce the gap until the bending radius of the optical cable reaches the specified bending radius, and then stop moving.

[0183] 3) The first friction platform 12 is in close contact with the bottom of the optical cable, and a certain force is applied to the friction contact piece by the load, with the bottom of the friction contact piece in close contact with the optical cable.

[0184] 4) The first friction table 12 moves back and forth along the initial horizontal direction or vertical direction of the optical cable under the action of the third driving mechanism 13. One back-and-forth movement is recorded as one friction, and the friction distance is 240 mm.

[0185] 5) When friction is performed 100 times, stop the test, remove the optical cable, and weigh the mass m₁; record the weight loss of the optical cable, which is m₀ - m₁.

[0186] 6) Take another 4 groups of optical cables, repeat the test, record the respective weight loss, take the average value of 5 groups of data, and calculate the wear resistance value A according to the aforementioned formula.

[0187] The wear resistance of three types of optical cables d, e and f was tested by this method. It was found that the outer sheath of optical cable d cracked, the outer sheath of optical cable e did not completely crack and its wear resistance value was 14.2g / m 2 , the outer sheath of optical cable f did not crack and its wear resistance value was 6.7g / m 2 , therefore, the wear resistance of optical cable f is better than that of optical cable e, and better than that of optical cable d.

[0188] Example 3

[0189] This example is used to investigate the wear resistance of vehicle-mounted optical cables such as body optical cables that are simultaneously in a bent state under uneven undulation conditions.

[0190] The diameter of the test optical cable is 5 mm, the diameter of the raised cylinder 21 is 50 mm, and the spacing is 25 mm. An obtuse angle is formed between each friction table. The composition of the friction table is garnet, and the abrasive grain size is 1160 / cm 2 .

[0191] The uneven friction table is in a "乙" (Chinese character for second) shape.

[0192] The specific test method is as follows:

[0193] 1) Take a section of optical cable to be tested with a length of 76 cm and measure its initial mass m₀,

[0194] 2) Fix the optical cable to be tested on the friction table through the cable stopper 22, the raised cylinder 21, etc.

[0195] 3) A total load of 9.8 N from two or more weights is applied to the optical cable.

[0196] 4) Pull the optical cable back and forth through two sets of tensioning mechanisms 20 to cause friction between the optical cable and the friction table. See Figure 6 as shown, wherein the friction at the joint of the first friction table 12 and the second friction table 19 is bending friction on different planes, and the friction on the second friction table 19 and the friction on the first friction table 12 at a lower height are bending friction on the same plane.

[0197] The friction distance was 240mm. After 100 cycles of back-and-forth friction, the test was stopped, the optical cable was removed, and its weight m1 was measured. The weight reduction of the optical cable was recorded as m0-m1.

[0198] 5) Take another 4 sets of optical cables, repeat the test, record the weight reduction of each set, take the average of the 5 sets of data, and calculate the wear resistance value A according to the formula mentioned above.

[0199] Using this method, the abrasion resistance of three types of optical cables (g, h, and i) was measured. The experimental results showed that the outer jacket of all three types of optical cables remained intact, and the abrasion resistance value of optical cable g was 1.32 g / m. 2 The abrasion resistance value of the optical cable (h) is 5.14 g / m. 2 The abrasion resistance value of optical cable i is 3.67 g / m. 2 Therefore, the wear resistance of g optical cable is better than that of i optical cable, and better than that of h optical cable.

[0200] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0201] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0202] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement 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 spirit or 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 claimed herein.

Claims

1. A cable abrasion resistance testing device, characterized in that, It includes a dynamic bending abrasion resistance testing device, which comprises: A first robotic arm (1) is provided with a guide mechanism (3) for guiding the cable (2) to move along the axial direction of the first robotic arm (1). The second robotic arm (4) is rotatably connected to the first robotic arm (1) via a wire harness base (5). The second robotic arm (4) is provided with a first drive mechanism (6) for driving the cable (2) to move along the axis of the second robotic arm (4) away from the wire harness base (5) on the surface of the second robotic arm (4). The wire harness base (5) is provided with a wire harness hole (7) for the cable (2) to pass through. The second drive mechanism (8) is rotatably connected to the second robotic arm (4) and is used to drive the second robotic arm (4) to reciprocate around the wire harness base (5).

2. The cable abrasion resistance testing equipment as described in claim 1, characterized in that: The guiding mechanism (3) includes a pipe, the outer wall of which is fixed to the first robotic arm (1), or the pipe is sleeved on the outside of the first robotic arm (1).

3. The cable abrasion resistance testing equipment as described in claim 1, characterized in that: The guiding mechanism (3) includes a cable groove opened on the first robotic arm (1) and an anti-detachment component provided at the opening of the cable groove.

4. The cable abrasion resistance testing equipment as described in claim 1, characterized in that, The first drive mechanism (6) includes: Multiple pulleys (9); A belt (10) is fitted on all pulleys (9), and a channel is formed between the belt (10) and the second robotic arm (4) for the cable (2) to pass through; An air pump is connected to the belt (10) and is used to inflate or deflate the belt (10); The motor is connected to the pulley (9) and is used to drive the pulley (9) to rotate so that the belt (10) drives the cable (2) to move.

5. The cable abrasion resistance testing equipment as described in claim 1, characterized in that: The second robotic arm (4) is provided with a baffle (11) for blocking the cable (2) at one end away from the wire harness base (5).

6. The cable abrasion resistance testing equipment as described in claim 1, characterized in that: The cross-section of the wire harness hole (7) is fan-shaped, triangular or quadrilateral.

7. The cable abrasion resistance testing equipment as described in claim 1, characterized in that: The second robotic arm (4) rotates at an angle of 0 ≤ θ < 180°.

8. The cable abrasion resistance testing equipment as described in claim 1, characterized in that, The cable abrasion resistance testing equipment also includes a static bending abrasion resistance testing device in the same plane, which includes: The friction mechanism includes a first friction table (12) and a third drive mechanism (13), the third drive mechanism (13) being connected to the first friction table (12) and used to drive the first friction table (12) to move in the horizontal plane; The load mechanism includes a load (14) and a fourth drive mechanism (15), the fourth drive mechanism (15) being connected to the load (14) and used to drive the load (14) closer to or further away from the first friction table (12) to clamp or release the cable (2). The cable locking mechanism includes two locking clips (16) for fixing the two ends of the cable (2), and the two locking clips (16) are spaced apart.

9. The cable abrasion resistance testing equipment as described in claim 8, characterized in that: The load (14) is also connected to a pressure sensor (17) for measuring the pressure applied to the cable (2).

10. The cable abrasion resistance testing equipment as described in claim 8, characterized in that: The load (14) has a friction contact piece (18) on the wall surface facing the first friction table (12).

11. The cable abrasion resistance testing equipment as described in claim 10, characterized in that: The friction contact piece (18) is provided with a corrugated matrix, a dotted protrusion matrix or a sawtooth matrix.

12. The cable abrasion resistance testing equipment as described in claim 8, characterized in that: The cable locking mechanism further includes a fifth driving mechanism, which is connected to the locking clip (16) and is used to drive the locking clip (16) to move closer to or away from another locking clip (16).

13. The cable abrasion resistance testing equipment as described in claim 8, characterized in that: The abrasive grain size on the friction surface of the first friction table (12) is 1100-1200 / cm. 2 .

14. The cable abrasion resistance testing equipment as described in claim 1, characterized in that, The cable abrasion resistance testing equipment also includes a static bending abrasion resistance testing device for different planes, which includes: Two first friction platforms (12) with different heights; The second friction table (19) is connected between the two first friction tables (12). The second friction table (19) is provided with a path limiting component for limiting the routing of the cable (2). The load mechanism includes a load (14) and a fourth drive mechanism (15), the fourth drive mechanism (15) being connected to the load (14) and used to drive the load (14) closer to or further away from the first friction table (12) to clamp or release the cable (2). Tensioning mechanism (20), which is located on the first friction table (12) and is used to tension cable (2).

15. The cable abrasion resistance testing equipment as described in claim 14, characterized in that, The path limiting component includes a plurality of columns (21) disposed on the friction surface of the second friction table (19).

16. The cable abrasion resistance testing equipment as described in claim 14, characterized in that, The first friction table (12) is also provided with a cable limiting member (22), which is located between the tensioning mechanism (20) and the load (14).

17. The cable abrasion resistance testing equipment as described in any one of claims 1 to 16, characterized in that, The cable abrasion resistance testing equipment also includes a test chamber (23), which is equipped with a temperature control unit (24) and / or a humidity control unit (25).

18. A method for testing the abrasion resistance of cables, comprising using the cable abrasion resistance testing equipment as described in claim 1, characterized in that, It includes the following steps: Take a section of the cable to be tested (2) and weigh its mass m0 before friction; The cable (2) is placed on the guide mechanism (3) of the dynamic bending abrasion test device of the cable abrasion test equipment; After the cable (2) is passed through the wire harness hole (7) of the wire harness base (5), it is placed between the first drive mechanism (6) and the second robotic arm (4); The second robotic arm (4) is driven to reciprocate around the wire harness base (5) so that the cable (2) bends repeatedly. When the second robotic arm (4) is driven to rotate so that the cable (2) bends, the first drive mechanism (6) drives the cable (2) to move away from the wire harness base (5) along the axis of the second robotic arm (4). After a set number of reciprocating rotations, the mass m1 of the cable (2) after friction is measured. Based on m0, m1, and the cross-sectional area of ​​the cable outer sheath, the abrasion resistance value of the cable under dynamic bending is obtained.

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