A pull-out strength testing device for wiring harness terminal connection

Abstract

The invention discloses a pull-out strength testing device for a wiring harness terminal connection, and relates to the technical field of pull-out force testing of wiring harness terminals, comprising a tester and a wiring harness and a terminal inside the tester, wherein the terminal is buckled at one end of the wiring harness, a placement bin for placing the wiring harness and the terminal is provided at the bottom of the tester, and a test bin is provided on the tester, which converts the pulling force exerted on the wiring harness into a vertical upward pulling force on the upper terminal. Under the acting force, the terminal is slightly moved downward by the pulling force of the wiring harness, and a test plate and a movable column where the terminal is located are slightly moved downward. The dynamometer where the test plate and the movable column are located measures the pulling force at this time and displays it on a display screen on the dynamometer. When the pulling force exceeds the limit of the bonding force of the connection between the wiring harness and the terminal, the wiring harness and the terminal are separated, and the pulling force displayed by the dynamometer at this time is the maximum pulling force that the wiring harness and the terminal can withstand.

Description

Technical Field

[0001] The invention relates to the technical field of pull-out force testing of wiring harness terminals, in particular to a pull-out strength testing device for wiring harness terminal connections. Background Art

[0002] In the internal structure of distribution cabinets, distribution boxes, electrical cabinets and other equipment, many internal circuit connections rely on wiring harness terminals. It is very convenient to connect the terminals to the wiring harness and then complete the circuit connection of the equipment. Therefore, this application is very popular. Therefore, during use, the connection reliability of the terminals and the wiring harness is very important. If the connection between the line and the terminal is not reliable, such as easy to fall off, it will cause the circuit to break. Therefore, we test the pull-out force of the direct connection between the wiring harness and the terminal, and judge the connection reliability and stability of the wiring harness and terminal by the maximum pull-out force it is subjected to.

[0003] In the prior art, when testing the pull-out force of the wire harness and the terminal, the wire harness is pulled by related equipment. However, during the pulling process of the wire harness and the terminal, when the pulling force of the wire harness and the terminal exceeds their maximum bearing capacity, the wire harness and the terminal will separate, and the terminal will fly due to the huge reaction force. The flying terminals are not easy to collect and can easily injure nearby staff.

[0004] To this end, a pull-out strength testing device for a wiring harness terminal connection is proposed. Summary of the invention

[0005] The object of the present invention is to provide a pull-out strength testing device for wiring harness terminal connections to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a pull-out strength test device for a wiring harness terminal connection, comprising a tester and a wiring harness and a terminal inside the tester, wherein the terminal is buckled at one end of the wiring harness, a placement bin for placing the wiring harness and the terminal is provided at the bottom of the tester, a test bin is provided on the tester, and the test bin is located above the placement bin, a dynamometer is fixedly connected to the upper end of the inner surface of the test bin, a test disk capable of performing a pull-out force test on the terminal and the wiring harness is movably connected to one side of the lower end of the dynamometer, a hydraulic cylinder is embedded and fixedly provided in the test bin, a hydraulic rod is provided on the hydraulic cylinder, a folding line bracket is fixedly connected to the side of the hydraulic rod away from the hydraulic cylinder, and a fixing portion is fixedly connected to one end of the folding line bracket;

[0007] Preferably, the dynamometer is movably connected with a movable column, one end of which extends through the center of the test disk and is rotatably connected, a cavity is opened in the test disk, and a plurality of bayonet holes are opened on the side wall of the cavity, and the sizes of the plurality of bayonet holes correspond one-to-one to the diameter sizes of the various wiring harnesses.

[0008] Preferably, the test disc is provided with a clamping opening, a clamping plate is slidably connected in the clamping opening, one end of the clamping plate is rotatably connected to a screw rod, and the other end of the screw rod extends through the clamping opening and is threadedly connected.

[0009] Preferably, one end of the movable column is rotatably connected to an I-shaped turntable, the lower end of the I-shaped turntable is fixedly connected to a blocking plate, a spring cavity is provided in the I-shaped turntable, an I-shaped block extends through the spring cavity and is slidably connected, a fixing spring is sleeved on the I-shaped block, the fixing spring is located in the spring cavity, a clamping block is fixedly connected to one side of the I-shaped block, a limiting opening is provided on the movable column, the limiting opening is a polygon, the clamping block is a polygon corresponding to the limiting opening, and one end of the clamping block extends into and is slidably connected in the limiting opening.

[0010] Preferably, the blocking openings are densely arranged in the blocking sheet.

[0011] Preferably, an oil chamber is provided in the movable column, a through outlet is provided on the side wall between the bottom of the oil chamber and the I-shaped turntable, a sponge block is detachably connected to the outlet, the bottom of the inner surface of the oil chamber presents a slope inclined toward the outlet, a passage is provided at the bottom of the gap at the rotation connection between the movable column and the I-shaped turntable, and the other end of the passage is connected to the gap at the rotation connection between the movable column and the test disk.

[0012] Preferably, a guide platform is fixedly connected in the test chamber, the guide platform is located directly below the dynamometer, a guide opening is formed on the guide platform, and a roller is rotatably connected in the guide opening.

[0013] Preferably, the fixing part includes a fixing platform, a hole is opened in the fixing platform, a fixing cavity is opened in the test chamber, a fixing cavity is opened in the rectangular cavity, two limiting slide bars are symmetrically fixedly connected in the fixing cavity, a supporting spring is sleeved on the limiting slide bar, one end of the limiting slide bar extends into and is slidably connected to the hole of the fixing platform, a fixing plate is arranged at one end of the fixing platform, and a fixing bolt is threadedly connected between the fixing platform and the fixing plate.

[0014] Preferably, a plurality of limiting columns are fixedly connected in the test chamber, and a limiting plate extends through the plurality of limiting columns and is fixedly connected to the limiting plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. After the wiring harness and the terminal are installed, the hydraulic cylinder is started. The hydraulic cylinder controls the hydraulic rod to drive the folding wire bracket to move, and the fixed plate fixedly connected to the folding wire bracket moves. The fixed plate pushes the fixed wiring harness and the fixed platform to move along the direction of the limit slide bar. The wiring harness is subjected to tension and guided by the roller, and the tension on the wiring harness is converted into a vertical upward tension on the upper terminal. Under this force, the terminal is slightly moved downward by the tension of the wiring harness, and the test plate and the movable column where the terminal is located are slightly moved downward. The dynamometer where the test plate and the movable column are located measures and displays the pulling force at this time on the display screen on the dynamometer. When the pulling force exceeds the limit of the bonding force of the wiring harness and the terminal, the wiring harness and the terminal are separated. At this time, the pulling force displayed by the dynamometer is the maximum pulling force that the wiring harness and the terminal can withstand.

[0017] 2. The present invention places lubricating oil in the oil chamber, and the lubricating oil is absorbed by the sponge block at the bottom of the oil chamber, while the movable column itself does not rotate. That is, when the I-shaped turntable is rotated, the side wall where the I-shaped turntable and the sponge block contact will be adhered with lubricating oil, thereby lubricating the I-shaped turntable and enabling it to rotate more smoothly without jamming;

[0018] 3. With the increase of the number of rotations, the lubricating oil on the side wall of the I-shaped turntable increases and gradually flows down along the side wall of the I-shaped turntable. When the lubricating oil flows to the bottom, the lubricating oil flows through the passage to the gap between the movable column and the rotating connection of the test disc, thereby lubricating the test disc. That is, the excess lubricating oil when lubricating the I-shaped turntable can be recycled and the test disc can be lubricated.

[0019] 4. The present invention has multiple bayonet holes on the side wall of the cavity, and the sizes of the multiple bayonet holes correspond to the diameters of various wiring harnesses one by one, so that wiring harnesses and terminals of different diameters can match bayonet holes of different diameters, thereby increasing the application scope of the test equipment.

[0020] 5. The present invention extends the end of the wiring harness away from the terminal out of the area between the fixed platform and the fixed plate, then sticks the wiring harness to the limit plate and passes through the area between multiple limit posts and finally pulls it out of the device. The advantage of this is that the combined action of the limit plate and multiple limit posts can guide the excess part of the wiring harness to prevent the wiring harness from entering the area of ​​the hydraulic cylinder and the hydraulic rod, thereby avoiding adverse effects on the test device, such as the wiring harness being released to the hydraulic cylinder, the area with higher temperature on the hydraulic rod causing the outer skin of the wiring harness to age and soften, the wiring harness being stuck on the hydraulic rod and following the movement of the hydraulic rod, ultimately affecting the measurement accuracy, and other problems.

[0021] 6. The present invention adopts a design in which a roller is rotatably connected in the guide port, so as to reduce the problem that the roller exerts an additional force on the wire harness when the wire harness moves slightly, thereby affecting the final test accuracy.

[0022] 7. In the present invention, when the wire harness and the terminal are separated by exceeding the limit pulling force, the terminal is subjected to the huge difference of the reaction force and flies off. After the terminal flies off, it is blocked by the blocking piece to offset the kinetic energy of the terminal and finally stay in the cavity to prevent the terminal from hitting the staff and causing harm to the staff after the terminal flies off. The blocking opening on the blocking piece is designed to offset more kinetic energy of the terminal after it flies off, so that the anti-flying effect is better. At the same time, the terminal finally stays in the cavity after it flies off, which is also convenient for collecting the rear terminals after the terminals fly off. According to the above principle, the I-shaped block is pulled open, and then the blocking piece is rotated to complete the collection.

[0023] 8. The present invention can not only test the pull-out force of the wire harness and the terminal, but also test the tension that a single wire harness can withstand. Its specific working principle is to rotate the I-shaped turntable so that the clamp on the I-shaped turntable is located at the bottom, and one end of the single wire harness is inserted into the clamp. Then, the screw is turned to move the clamp to finally fix the end of the wire harness inserted into the clamp. Then, according to the above principle, a tension test is performed by starting the hydraulic cylinder. When the wire harness is broken, the maximum tension displayed on the dynamometer is the maximum tension that the wire harness can withstand. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is the overall structure diagram of the present invention;

[0025] Figure 2 is a side view of the present invention;

[0026] Figure 3 is a cross-sectional view of a test disc of the present invention;

[0027] Figure 4 It is a partial side view of the present invention;

[0028] Figure 5 is a cross-sectional view of a fixing portion of the present invention;

[0029] Figure 6 A relative position view of the blocking sheet and the movable column of the present invention;

[0030] Figure 7 A combined view of the clamp and the clamp of the present invention;

[0031] Figure 8 It is the overall structural view of the blocking port of the present invention.

[0032] In the figure:

[0033] 1. Tester; 11. Placement bin; 12. Test bin; 13. Wire harness; 14. Terminal; 2. Dynamometer; 21. Test disc; 22. Hydraulic cylinder; 23. Hydraulic rod; 24. Broken line bracket; 25. Fixed part; 3. Movable column; 31. Cavity; 32. Bayonet; 4. Clamp; 41. Clamp; 42. Screw; 5. I-shaped turntable; 51. Blocking piece; 52. I-shaped block; 53. Spring cavity; 54. Fixed spring; 55. Limiting mouth; 56. Block; 6. Blocking mouth; 7. Oil cavity; 71. Sponge block; 72. Passage; 8. Guide platform; 81. Guide mouth; 82. Roller; 9. Rectangular cavity; 91. Fixed cavity; 92. Limiting slide bar; 93. Fixed platform; 94. Support spring; 95. Fixed plate; 96. Fixed bolt; 100. Limiting column; 1001. Limiting piece. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figures 1 to 8 , the present invention provides a technical solution:

[0036] A pulling strength testing device for a wiring harness terminal connection comprises a tester 1 and a wiring harness 13 and a terminal 14 inside the tester 1, wherein the terminal 14 is buckled at one end of the wiring harness 13, a placement bin 11 for placing the wiring harness 13 and the terminal 14 is provided at the bottom of the tester 1, a test bin 12 is provided on the tester 1, and the test bin 12 is located above the placement bin 11, a dynamometer 2 is fixedly connected to the upper end of the inner surface of the test bin 12, a test disc 21 capable of performing a pulling force test on the terminal 14 and the wiring harness 13 is movably connected to one side of the lower end of the dynamometer 2, a hydraulic cylinder 22 is embedded and fixedly provided in the test bin 12, a hydraulic rod 23 is provided on the hydraulic cylinder 22, a fold line bracket 24 is fixedly connected to the side of the hydraulic rod 23 away from the hydraulic cylinder 22, and a fixing portion 25 is fixedly connected to one end of the fold line bracket 24.

[0037] As an embodiment of the present invention, as shown in the figure, a movable column 3 is movably connected to the dynamometer 2, one end of the movable column 3 extends through the center of the test disk 21 and is rotatably connected, a cavity 31 is opened in the test disk 21, and a plurality of bayonet holes 32 are opened on the side wall of the cavity 31, and the sizes of the plurality of bayonet holes 32 correspond one by one to the diameter sizes of the various wiring harnesses 13.

[0038] During operation, a plurality of bayonet holes 32 are provided on the side wall of the cavity 31. The sizes of the plurality of bayonet holes 32 correspond to the diameters of the various wiring harnesses 13 in a one-to-one manner, so that wiring harnesses 13 and terminals 14 of different diameters can match bayonet holes 32 of different diameters, thereby increasing the scope of application of the test equipment.

[0039] As an embodiment of the present invention, as shown in the figure, a clamping opening 4 is opened on the test disk 21, a clamping plate 41 is slidably connected in the clamping opening 4, one end of the clamping plate 41 is rotatably connected to a screw rod 42, and the other end of the screw rod 42 extends through the clamping opening 4 and is threadedly connected.

[0040] One end of the movable column 3 is rotatably connected to an I-shaped turntable 5, and the lower end of the I-shaped turntable 5 is fixedly connected to a blocking piece 51. A spring cavity 53 is provided in the I-shaped turntable 5, and an I-shaped block 52 extends through and slidably connected to the spring cavity 53. A fixing spring 54 is sleeved on the I-shaped block 52, and the fixing spring 54 is located in the spring cavity 53. A clamping block 56 is fixedly connected to one side of the I-shaped block 52. A limiting opening 55 is provided on the movable column 3, and the limiting opening 55 is a polygon. The clamping block 56 is a polygon corresponding to the limiting opening 55, and one end of the clamping block 56 extends into and is slidably connected to the limiting opening 55.

[0041] During operation, when the pull-out force test is performed on the connected wiring harness 13 and terminal 14, a plurality of wiring harnesses 13 and terminals 14 of different specifications are placed in the placement bin 11, the buckled wiring harnesses 13 and terminals 14 are taken out from the placement bin 11, the test disc 21 is rotated to rotate the bayonet 32 ​​of the wiring harness 13 specification to be tested on the test disc 21 to the bottom, and then the I-shaped block 52 is moved by hand, and the block 56 fixedly connected to the I-shaped block 52 moves, and the block 56 leaves the limit opening 55 to release the fixation of the I-shaped turntable 5, and then the I-shaped turntable 5 is rotated, and the I-shaped turntable 5 is The blocking piece 51 fixedly connected to the bottom of the disk 5 rotates, and when the blocking piece 51 rotates to no longer block the lowermost bayonet 32 ​​to be used to place the wiring harness 13, the I-shaped block 52 is released, and the I-shaped block 52 is reset under the action of the fixing spring 54, and the clamping block 56 fixedly connected to the I-shaped block 52 moves and resets so as to extend into the limit opening 55 to be locked. At this time, the I-shaped turntable 5 and the blocking piece 51 are fixed, and then the end of the wiring harness 13 to be tested close to the terminal 14 is extended into the bayonet 32, and the terminal 14 buckled on the wiring harness 13 is located inside the cavity 31 and against one side of the bayonet 32;

[0042] After the wiring harness 13 and the terminal 14 are installed, the I-shaped block 52 is pulled open to release the fixation of the movable column 3 to the I-shaped turntable 5, and then the blocking piece 51 fixedly connected to the I-shaped turntable 5 is moved to the bottom to just block the installed wiring harness 13 and the terminal 14, and then the I-shaped block 52 is loosened to complete the fixation of the wiring harness 13 and the terminal 14.

[0043] As an embodiment of the present invention, as shown in the figure, the blocking plate 51 is densely provided with blocking openings 6 .

[0044] During operation, when the limit pulling force is exceeded to cause the wiring harness 13 and the terminal 14 to separate, the terminal 14 is subjected to the huge difference in reaction force and flies off. After the terminal 14 flies off, it is blocked by the blocking piece 51 to offset the kinetic energy of the terminal 14 and finally remain in the cavity 31 to prevent the terminal 14 from hitting the staff and causing harm to the staff after it flies off. The blocking opening 6 on the blocking piece 51 is designed to offset more kinetic energy of the terminal 14 after it flies off, so that the anti-flying effect is better. At the same time, the terminal 14 finally stays in the cavity 31 after it flies off, which is also convenient for collecting the terminal 14 after it flies off. According to the above principle, the I-shaped block 52 is pulled open, and then the blocking piece 51 is rotated to complete the collection.

[0045] As an embodiment of the present invention, as shown in the figure, an oil chamber 7 is opened in the movable column 3, and a through outlet is opened on the side wall between the bottom of the oil chamber 7 and the I-shaped turntable 5, and a sponge block 71 is detachably connected to the outlet. The bottom of the inner surface of the oil chamber 7 presents a slope inclined toward the outlet, and a passage 72 is opened at the bottom of the gap at the rotation connection between the movable column 3 and the I-shaped turntable 5, and the other end of the passage 72 is connected to the gap at the rotation connection between the movable column 3 and the test disk 21.

[0046] During operation, lubricating oil is placed in the oil chamber 7, and the lubricating oil is absorbed by the sponge block 71 at the bottom of the oil chamber 7, while the movable column 3 itself does not rotate. That is to say, when the I-shaped turntable 5 is rotated, the side wall where the I-shaped turntable 5 and the sponge block 71 are in contact will be adhered with lubricating oil, thereby lubricating the I-shaped turntable 5, so that it can rotate more smoothly without jamming.

[0047] As the number of rotations increases, more and more lubricating oil is deposited on the side wall of the I-shaped turntable 5, and gradually flows down along the side wall of the I-shaped turntable 5. When it flows to the bottom, the lubricating oil flows through the passage 72 to the gap between the movable column 3 and the test disk 21 for rotation connection, thereby lubricating the test disk 21. That is, the excess lubricating oil when lubricating the I-shaped turntable 5 can be recycled and the test disk 21 can be lubricated.

[0048] As an embodiment of the present invention, as shown in the figure, a guide platform 8 is fixedly connected in the test chamber 12, and the guide platform 8 is located directly below the dynamometer 2. A guide opening 81 is opened on the guide platform 8, and a roller 82 is rotatably connected in the guide opening 81.

[0049] During operation, the design of the roller 82 rotatably connected in the guide opening 81 is to reduce the problem that the roller 82 exerts additional force on the wire harness 13 when the wire harness 13 moves slightly, thereby affecting the final test accuracy.

[0050] As an embodiment of the present invention, as shown in the figure, the fixing portion 25 includes a fixing platform 93, a hole is opened in the fixing platform 93, a rectangular cavity 9 is opened in the test chamber 12, a fixing cavity 91 is opened in the rectangular cavity 9, two limiting slide bars 92 are symmetrically fixedly connected in the fixing cavity 91, a support spring 94 is sleeved on the limiting slide bar 92, one end of the limiting slide bar 92 extends into and is slidably connected to the hole of the fixing platform 93, a fixing plate 95 is arranged at one end of the fixing platform 93, and a fixing bolt 96 is threadedly connected between the fixing platform 93 and the fixing plate 95.

[0051] During operation, the end of the wiring harness 13 away from the terminal 14 first passes through the roller 82 in the guide port 81, and then extends out of the area between the fixing platform 93 and the fixing plate 95 in the fixing portion 25, and the fixing bolt 96 is turned to move the fixing plate 95 to clamp and fix the wiring harness 13 in this area.

[0052] As an embodiment of the present invention, as shown in the figure, a plurality of limiting columns 100 are fixedly connected in the test chamber 12 , and a limiting piece 1001 extends through the plurality of limiting columns 100 and is fixedly connected to the limiting piece 1001 .

[0053] During operation, after the end of the wire harness 13 away from the terminal 14 is extended out of the area between the fixing platform 93 and the fixing plate 95, the wire harness 13 is attached to the limiting plate 1001 and passed through the area between the plurality of limiting pillars 100 and finally pulled out of the device. Figure 2 and Figure 5 As described above, the advantage of doing so is that the joint action of the limit plate 1001 and the plurality of limit columns 100 can guide the redundant part of the wire harness 13, preventing the wire harness 13 from entering the area of ​​the hydraulic cylinder 22 and the hydraulic rod 23, and avoiding adverse effects on the test device, such as the wire harness 13 being released to the area with higher temperature on the hydraulic cylinder 22 and the hydraulic rod 23, causing the outer skin of the wire harness 13 to age and soften, and the wire harness 13 being stuck on the hydraulic rod 23 and moving with the hydraulic rod 23, ultimately affecting the measurement accuracy.

[0054] After the wiring harness 13 and the terminal 14 are installed, the hydraulic cylinder 22 is started. The hydraulic cylinder 22 works to control the hydraulic rod 23 to drive the folding line bracket 24 to move, and the fixed plate 95 fixedly connected to the folding line bracket 24 moves. The fixed plate 95 pushes the fixed wiring harness 13 and the fixed platform 93 to move along the direction of the limit slide bar 92. The wiring harness 13 is subjected to the tension and guided by the roller 82, and the tension on the wiring harness 13 is converted into a vertical upward tension on the upper terminal 14. Under this force, the terminal 14 is slightly moved downward by the tension of the wiring harness 13, and the test disk 21 and the movable column 3 where the terminal 14 is located are slightly moved downward. The dynamometer 2 where the test disk 21 and the movable column 3 are located measures and displays the pulling force at this time on the display screen on the dynamometer 2. When the pulling force exceeds the limit of the bonding force between the wiring harness 13 and the terminal 14, the wiring harness 13 and the terminal 14 are separated. At this time, the pulling force displayed by the dynamometer 2 is the maximum pulling force that the wiring harness 13 and the terminal 14 can withstand.

[0055] It should be noted that the fixing bolt 96 is threadedly connected to the fixing platform 93, and the fixing bolt 96 penetrates the fixing plate 95 and is rotatably connected to the fixing plate 95. The advantage of this is that when the hydraulic cylinder 22 drives the folding line bracket 24 to move through the hydraulic rod 23, the fixing plate 95 fixedly connected to the folding line bracket 24 will also move, so that the wire harness 13 can be further clamped to prevent the loosening of the wire harness 13 from causing errors in the test accuracy;

[0056] The device can not only test the pulling force of the wire harness 13 and the terminal 14, but also test the pulling force that a single wire harness 13 can withstand. The specific working principle is to rotate the I-shaped turntable 5 so that the clamp 4 on the I-shaped turntable 5 is located at the bottom, and one end of the single wire harness 13 is inserted into the clamp 4, and then the screw 42 is turned to move the clamp 41 to finally fix the end of the wire harness 13 inserted into the clamp 4, and then according to the above principle, the tension test is carried out by starting the hydraulic cylinder 22. When the wire harness 13 is broken, the maximum tension displayed on the dynamometer 2 is the maximum tension that the wire harness 13 can withstand.

[0057] Working principle: When the pull-out force test is performed on the connected wire harness 13 and terminal 14, a plurality of wire harnesses 13 and terminals 14 of different specifications are placed in the placement bin 11, the buckled wire harnesses 13 and terminals 14 are taken out from the placement bin 11, the test disk 21 is rotated to rotate the bayonet 32 ​​on the test disk 21 corresponding to the specification of the wire harness 13 to be tested to the bottom, and then the I-shaped block 52 is moved by hand, and the block 56 fixedly connected to the I-shaped block 52 moves, and the block 56 leaves the limit opening 55 to release the fixation of the I-shaped turntable 5, and then the I-shaped turntable 5 is rotated, and the I-shaped turntable 5 is The blocking piece 51 fixedly connected to the bottom of the turntable 5 rotates, and when the blocking piece 51 rotates to no longer block the lowermost bayonet 32 ​​to be used to place the wiring harness 13, the I-shaped block 52 is released, and the I-shaped block 52 is reset under the action of the fixing spring 54, and the clamping block 56 fixedly connected to the I-shaped block 52 moves and resets so as to extend into the limit opening 55 to be locked. At this time, the I-shaped turntable 5 and the blocking piece 51 are fixed, and then the end of the wiring harness 13 to be tested close to the terminal 14 is extended into the bayonet 32, and the terminal 14 buckled on the wiring harness 13 is located inside the cavity 31 and against one side of the bayonet 32;

[0058] Lubricating oil is placed in the oil chamber 7, and the lubricating oil is absorbed by the sponge block 71 at the bottom of the oil chamber 7, while the movable column 3 itself does not rotate. That is to say, when the I-shaped turntable 5 is rotated, the side wall where the I-shaped turntable 5 and the sponge block 71 are in contact will be adhered with lubricating oil, thereby lubricating the I-shaped turntable 5, so that it can rotate more smoothly without jamming;

[0059] As the number of rotations increases, the lubricating oil on the side wall of the I-shaped turntable 5 increases, and gradually flows down along the side wall of the I-shaped turntable 5. When the lubricating oil flows to the bottom, the lubricating oil flows through the passage 72 to the gap between the movable column 3 and the test disc 21 for rotation connection, thereby lubricating the test disc 21. That is, the excess lubricating oil when lubricating the I-shaped turntable 5 can be recycled and the test disc 21 can be lubricated.

[0060] A plurality of bayonet holes 32 are provided on the side wall of the cavity 31. The sizes of the plurality of bayonet holes 32 correspond to the diameters of the various wiring harnesses 13. The wiring harnesses 13 and terminals 14 of different diameters can be matched with bayonet holes 32 of different diameters, thereby increasing the applicable scope of the test equipment.

[0061] After the wiring harness 13 and the terminal 14 are installed, the I-shaped block 52 is pulled open to release the fixing of the movable column 3 to the I-shaped turntable 5, and then the blocking piece 51 fixedly connected to the I-shaped turntable 5 is moved to the bottom to just block the installed wiring harness 13 and the terminal 14, and then the I-shaped block 52 is loosened to complete the fixing of the wiring harness 13 and the terminal 14;

[0062] The end of the wire harness 13 away from the terminal 14 first passes through the roller 82 in the guide opening 81, and then extends out of the area between the fixing platform 93 and the fixing plate 95 in the fixing portion 25, and the fixing bolt 96 is screwed to move the fixing plate 95 so as to clamp and fix the wire harness 13 in the area;

[0063] After the end of the wire harness 13 away from the terminal 14 is extended out of the area between the fixing platform 93 and the fixing plate 95, the wire harness 13 is attached to the limiting plate 1001 and passed through the area between the plurality of limiting pillars 100 and finally pulled out of the device. Figure 2 and Figure 5 As described above, the advantage of doing so is that the joint action of the limit plate 1001 and the plurality of limit columns 100 can guide the redundant part of the wire harness 13, preventing the wire harness 13 from entering the area of ​​the hydraulic cylinder 22 and the hydraulic rod 23, and avoiding adverse effects on the test device, such as the wire harness 13 being released to the area with higher temperature on the hydraulic cylinder 22 and the hydraulic rod 23, causing the outer skin of the wire harness 13 to age and soften, and the wire harness 13 being stuck on the hydraulic rod 23 and moving with the hydraulic rod 23, ultimately affecting the measurement accuracy.

[0064] After the wiring harness 13 and the terminal 14 are installed, the hydraulic cylinder 22 is started. The hydraulic cylinder 22 works to control the hydraulic rod 23 to drive the folding line bracket 24 to move, and the fixed plate 95 fixedly connected to the folding line bracket 24 moves. The fixed plate 95 pushes the fixed wiring harness 13 and the fixed platform 93 to move along the direction of the limit slide bar 92. The wiring harness 13 is subjected to the tension and guided by the roller 82, and the tension on the wiring harness 13 is converted into a vertical upward tension on the upper terminal 14. Under this force, the terminal 14 is slightly moved downward by the tension of the wiring harness 13, and the test disk 21 and the movable column 3 where the terminal 14 is located are slightly moved downward. The dynamometer 2 where the test disk 21 and the movable column 3 are located measures and displays the pulling force at this time on the display screen on the dynamometer 2. When the pulling force exceeds the limit of the bonding force between the wiring harness 13 and the terminal 14, the wiring harness 13 and the terminal 14 are separated. At this time, the pulling force displayed by the dynamometer 2 is the maximum pulling force that the wiring harness 13 and the terminal 14 can withstand.

[0065] The design of the roller 82 rotatably connected in the guide opening 81 is to reduce the problem that the roller 82 generates an additional force on the wire harness 13 when the wire harness 13 moves slightly, thereby affecting the final test accuracy;

[0066] When the limit pulling force is exceeded to cause the wiring harness 13 and the terminal 14 to separate, the terminal 14 is subjected to the huge difference in reaction force and flies off. After the terminal 14 flies off, it is blocked by the blocking piece 51 to offset the kinetic energy of the terminal 14 and finally stay in the cavity 31 to prevent the terminal 14 from hitting the staff and causing harm to the staff after it flies off. The blocking opening 6 on the blocking piece 51 is designed to offset more kinetic energy of the terminal 14 after it flies off, so that the anti-flying effect is better. At the same time, the terminal 14 finally stays in the cavity 31 after it flies off, which is also convenient for collecting the terminal 14 after it flies off. According to the above principle, the I-shaped block 52 is pulled open, and then the blocking piece 51 is rotated to complete the collection.

[0067] It should be noted that the fixing bolt 96 is threadedly connected to the fixing platform 93, and the fixing bolt 96 penetrates the fixing plate 95 and is rotatably connected to the fixing plate 95. The advantage of this is that when the hydraulic cylinder 22 drives the folding line bracket 24 to move through the hydraulic rod 23, the fixing plate 95 fixedly connected to the folding line bracket 24 will also move, so that the wire harness 13 can be further clamped to prevent the loosening of the wire harness 13 from causing errors in the test accuracy;

[0068] The device can not only test the pulling force of the wire harness 13 and the terminal 14, but also test the pulling force that a single wire harness 13 can withstand. The specific working principle is to rotate the I-shaped turntable 5 so that the clamp 4 on the I-shaped turntable 5 is located at the bottom, and one end of the single wire harness 13 is inserted into the clamp 4, and then the screw 42 is turned to move the clamp 41 to finally fix the end of the wire harness 13 inserted into the clamp 4. Then, according to the above principle, the tension test is performed by starting the hydraulic cylinder 22. When the wire harness 13 is broken, the maximum tension displayed on the dynamometer 2 is the maximum tension that the wire harness 13 can withstand.

[0069] The device is particularly suitable as experimental equipment in school laboratories, and is safe, practical and low-cost.

[0070] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pull-out strength test device for a wiring harness terminal connection, comprising a tester (1) and a wiring harness (13) and a terminal (14) inside the tester (1), wherein the terminal (14) is buckled onto one end of the wiring harness (13), a placement compartment (11) for placing the wiring harness (13) and the terminal (14) is provided at the bottom of the tester (1), a test compartment (12) is provided on the tester (1), and the test compartment (12) is located above the placement compartment (11), and is characterized in that: A dynamometer (2) is fixedly connected to the upper end of the inner surface of the test chamber (12); a test plate (21) capable of performing a pull-out force test on the terminal (14) and the wiring harness (13) is movably connected to one side of the lower end of the dynamometer (2); a hydraulic cylinder (22) is embedded and fixedly arranged in the test chamber (12); a hydraulic rod (23) is arranged on the hydraulic cylinder (22); a side of the hydraulic rod (23) away from the hydraulic cylinder (22) is fixedly connected to a folding line bracket (24); and one end of the folding line bracket (24) is fixedly connected to a fixing portion (25); The dynamometer (2) is movably connected to a movable column (3), one end of the movable column (3) extends through the center of the test disc (21) and is rotatably connected, a cavity (31) is provided in the test disc (21), a plurality of bayonet holes (32) are provided on the side wall of the cavity (31), and the sizes of the plurality of bayonet holes (32) correspond to the diameter sizes of the plurality of wire harnesses (13); One end of the movable column (3) is rotatably connected to an I-shaped rotating disk (5), and a blocking plate (51) is fixedly connected to the lower end of the I-shaped rotating disk (5). A spring cavity (53) is provided in the I-shaped rotating disk (5), and an I-shaped block (52) extends through and is slidably connected to the spring cavity (53). A fixing spring (54) is sleeved on the I-shaped block (52), and the fixing spring (54) is located in the spring cavity (53). A clamping block (56) is fixedly connected to one side of the I-shaped block (52). A limiting opening (55) is provided on the movable column (3), and the limiting opening (55) is a polygon. The clamping block (56) is a polygon corresponding to the limiting opening (55), and one end of the clamping block (56) extends into and is slidably connected to the limiting opening (55). An oil chamber (7) is provided in the movable column (3), a through outlet is provided on the side wall between the bottom of the oil chamber (7) and the I-shaped turntable (5), a sponge block (71) is detachably connected to the outlet, the bottom of the inner surface of the oil chamber (7) presents a slope inclined toward the outlet, a passage (72) is provided at the bottom of the gap at the rotation connection between the movable column (3) and the I-shaped turntable (5), and the other end of the passage (72) is connected to the gap at the rotation connection between the movable column (3) and the test disk (21).

2. A pull-out strength test device for wiring harness terminal connection according to claim 1, characterized in that: The test disc (21) is provided with a clamping opening (4), a clamping plate (41) is slidably connected in the clamping opening (4), one end of the clamping plate (41) is rotatably connected to a screw rod (42), and the other end of the screw rod (42) extends through the clamping opening (4) and is threadedly connected.

3. A pull-out strength test device for wiring harness terminal connection according to claim 2, characterized in that: The blocking sheet (51) is densely provided with blocking openings (6).

4. A pull-out strength test device for wiring harness terminal connection according to claim 3, characterized in that: A guide platform (8) is fixedly connected inside the test chamber (12), the guide platform (8) is located directly below the dynamometer (2), a guide opening (81) is provided on the guide platform (8), and a roller (82) is rotatably connected inside the guide opening (81).

5. A pull-out strength test device for wiring harness terminal connection according to claim 4, characterized in that: The fixing portion (25) comprises a fixing platform (93), a hole is formed in the fixing platform (93), a rectangular cavity (9) is formed in the test chamber (12), a fixing cavity (91) is formed in the rectangular cavity (9), two limiting slide bars (92) are symmetrically fixedly connected in the fixing cavity (91), a support spring (94) is sleeved on the limiting slide bar (92), one end of the limiting slide bar (92) extends into and is slidably connected to the hole of the fixing platform (93), a fixing plate (95) is provided at one end of the fixing platform (93), and a fixing bolt (96) is threadedly connected between the fixing platform (93) and the fixing plate (95).

6. A pull-out strength test device for wiring harness terminal connection according to claim 5, characterized in that: A plurality of limiting columns (100) are fixedly connected in the test chamber (12), and a limiting plate (1001) extends through the plurality of limiting columns (100) and is fixedly connected to the limiting plate (1001).

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