Rapid detection device and method for low-voltage wire harness terminal

Abstract

The invention discloses a low-voltage wire harness terminal rapid detection device and method, and the device comprises a pin terminal part which is detachably connected with a counterweight nut through a connection part, and the pin terminal part is used for being connected with a pin of a detected low-voltage wire harness terminal or being connected with a jack of the detected low-voltage wire harness terminal. The device is very light and portable, and can be used for detecting the low-voltage wire harness terminal, so that whether the low-voltage wire harness terminal has a chambering phenomenon or an insufficient holding force phenomenon or not can be judged on site at the first time when a fault occurs.

Description

Technical Field

[0001] The present invention relates to the field of low - voltage communication disconnection fault diagnosis, and specifically refers to a rapid detection device and method for low - voltage harness terminals. Background Art

[0002] Based on the current power battery industry, the low - voltage harness terminals of battery low - voltage sampling harnesses are constantly iterating and updating. From the terminals originally adapted to a wire diameter of 0.5mm2 to the currently mass - applied terminals with a wire diameter of 0.35mm2, and further upgraded to develop towards terminals with a wire diameter of 0.22mm2. The high - speed upgrade and iteration of terminals will bring a series of fault problems. For example, the risk identification of partial failure in the process of harness manufacturing is not in place, resulting in the loss of low - voltage sampling signals, seriously affecting the normal driving of the whole vehicle and potential safety hazards. As an important part of the harness, the quality of low - voltage harness terminals directly affects the conductive performance and service life of the harness. Rapid and accurate detection can timely detect defects such as poor terminal crimping and core wire dispersion, thereby avoiding product failures during use and improving product reliability and safety. This harness belongs to a vulnerable tooling, with an upper limit requirement for the number of plug - in and unplug - in times, and the insulation skin is easily damaged, posing potential safety hazards.

[0003] The existing low - voltage harness terminal detection methods mainly include:

[0004] Machine vision technology: The image of the harness terminal is obtained through an image acquisition module, and then the image is processed and analyzed using image - processing algorithms to identify the appearance defects of the terminal. Traditional machine vision technology has problems such as difficulty in quantifying and extracting defect features and weak defect image recognition ability.

[0005] Profile analysis technology: Profile analysis is a technology that makes a profile of the harness terminal and observes and analyzes the profile using a microscope or a microscopic system. Through profile analysis, key parameters such as crimp height, crimp width, and measurable crimp width can be measured to evaluate the crimp quality of the terminal. This method is very effective for detecting defects such as poor crimping and core wire dispersion, but the operation is relatively complex and requires professional equipment and skills.

[0006] Automated detection equipment: There have already been various automated detection equipment on the market, such as fully automatic scanning detection software, integrated terminal cross - section analyzers, etc. These devices integrate image acquisition, processing, and analysis functions, and can achieve rapid and accurate detection of harness terminals. Automated detection equipment usually has characteristics such as high precision, high speed, and easy operation, which can greatly improve the detection efficiency and accuracy. However, automated detection equipment is usually expensive, which is a significant investment for enterprises, and the maintenance and upkeep of the equipment also require certain costs and time. Summary of the Invention

[0007] The object of the present invention is to provide a rapid detection device for low-voltage harness terminals on the one hand, and a rapid detection method for low-voltage harness terminals on the other hand. The device and method can, through a very portable and carry-on weight device, determine on-site whether there is reaming or insufficient holding force of the low-voltage harness terminals at the first time of a fault occurrence.

[0008] To achieve this object, a rapid detection device for low-voltage harness terminals designed by the present invention includes: the pin terminal part is detachably connected to the weight nut through the connecting part, and the pin terminal part is used to connect with the pins of the low-voltage harness terminals to be detected, or to connect with the jacks of the low-voltage harness terminals to be detected.

[0009] Further, the outer surface of the column of the connecting part is provided with threads.

[0010] Further, the weight nut is a columnar body with a hole in the middle, and the inner wall of the hole is provided with threads. The weight nut is detachably fixed on the column of the connecting part through the threads.

[0011] Further, one end of the pin terminal part is connected to the connecting part, and the other end is the pin part. The pin part is used to connect with the jacks of the low-voltage harness terminals to be detected, or the other end of the pin terminal part is the jack part, and the jack part is used to connect with the pins of the low-voltage harness terminals to be detected.

[0012] Further, the pin part of the pin terminal part includes the upper limit end of the pin terminal or the lower limit end of the pin terminal.

[0013] Further, the cross-sectional area of the pin part of the upper limit end of the pin terminal is the maximum tolerance dimension of the designed cross-sectional area of the jack of the low-voltage harness terminals to be detected; the cross-sectional area of the pin part of the lower limit end of the pin terminal is the minimum tolerance dimension of the designed cross-sectional area of the jack of the low-voltage harness terminals to be detected.

[0014] Furthermore, a method of using the above rapid detection device for low-voltage harness terminals includes: inserting the upper limit end of the pin terminal and the lower limit end of the pin terminal of the low-voltage harness terminal detection device into the jacks of the low-voltage harness terminals to be detected respectively, so that the inserted jacks of the low-voltage harness terminals to be detected are connected to the upper limit end of the pin terminal or the lower limit end of the pin terminal respectively, lifting the low-voltage harness terminal to be tested so that the low-voltage harness terminal detection device inserted into the low-voltage harness terminal to be tested is suspended perpendicular to the ground. Under the action of gravity, judge whether the jacks of the low-voltage harness terminals to be tested are reamed and whether they have a certain holding force according to whether the low-voltage harness terminal detection device comes off.

[0015] Furthermore, when using the low-voltage harness terminal detection device to detect the low-voltage harness terminal to be tested, the self-gravity of the weight nut is the same as the holding force of the low-voltage harness terminal to be tested.

[0016] Furthermore, a method for determining whether the jack of the low-voltage wire harness terminal to be measured is reamed and whether it has a certain holding force according to whether the detection device is disengaged includes: when the lower limit end of the pin terminal of the low-voltage wire harness terminal detection device disengages from the jack of the low-voltage wire harness terminal to be measured under the action of gravity, the jack of the low-voltage wire harness terminal to be measured has been reamed, and then according to the disengagement situation of the upper limit end of the pin terminal, it is determined whether the low-voltage wire harness terminal to be measured can be used; when the lower limit end of the pin terminal of the low-voltage wire harness terminal detection device does not disengage from the jack of the low-voltage wire harness terminal to be measured under the action of gravity, the jack of the low-voltage wire harness terminal to be measured is not reamed, the jack of the low-voltage wire harness terminal to be measured has a holding force, and the low-voltage wire harness terminal to be measured can be used.

[0017] Furthermore, when the lower limit end of the pin terminal of the low-voltage wire harness terminal detection device disengages from the jack of the low-voltage wire harness terminal to be measured under the action of gravity, the method for determining whether the low-voltage wire harness terminal to be measured can be used according to the disengagement situation of the upper limit end of the pin terminal includes: when the lower limit end of the pin terminal of the low-voltage wire harness terminal detection device disengages from the jack of the low-voltage wire harness terminal to be measured under the action of gravity and the upper limit end of the pin terminal of the low-voltage wire harness terminal detection device does not disengage from the jack of the low-voltage wire harness terminal to be measured under the action of gravity, the jack of the low-voltage wire harness terminal to be measured has been reamed, the jack of the low-voltage wire harness terminal to be measured still has a certain holding force, and the low-voltage wire harness terminal to be measured can be used; when the lower limit end of the pin terminal of the low-voltage wire harness terminal detection device disengages from the jack of the low-voltage wire harness terminal to be measured under the action of gravity and the upper limit end of the pin terminal of the low-voltage wire harness terminal detection device disengages from the jack of the low-voltage wire harness terminal to be measured under the action of gravity, the jack of the low-voltage wire harness terminal to be measured has been reamed, the jack of the low-voltage wire harness terminal to be measured does not have a holding force, and the low-voltage wire harness terminal to be measured cannot be used.

[0018] Advantages of the present invention: Currently, in the prior art, large equipment is used to magnify with a microscope to confirm whether there is deformation inside the low-voltage wire harness terminal, and the internal structural dimensions of the low-voltage wire harness terminal are also measured by taking pictures with precision equipment. This equipment can only be placed in the laboratory and cannot be carried around for quick confirmation. After the faulty part is removed, it needs to be mailed or taken to a place with this equipment for destructive testing to lock the internal dimensional structure of the low-voltage wire harness terminal. However, the present invention uses a very portable small counterweight device to determine on-site whether there is reaming or insufficient holding force at the first time of the fault. Description of the Drawings

[0019] Figure 1 It is a diagram of the low-voltage wire harness terminal detection device of the present invention;

[0020] Figure 2 It is a second diagram of the low-voltage wire harness terminal detection device of the present invention;

[0021] Among them, 1 is the first pin terminal; 2 is the second pin terminal; 3 is the first bolt hole; 4 is the second bolt hole; 5 is the connecting part; 6 is the counterweight nut; 7 is the pin terminal part. Detailed implementation manners

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0025] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be construed as indicating or implying relative importance.

[0026] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0027] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following further details the present invention in conjunction with the accompanying drawings and specific embodiments:

[0028] As Figure 1 shown, a rapid detection device for low-voltage harness terminals includes:

[0029] The pin terminal part 7 is detachably connected to the counterweight nut 6 through the connecting part 5. The pin terminal part 7 is used to connect with the pin of the low-voltage harness terminal to be detected, or to connect with the jack of the low-voltage harness terminal to be detected.

[0030] In the power battery industry, multiple low-voltage terminals are usually made into a harness and crimped together through a sheath. The low-voltage harness terminals are inserted into the corresponding sockets through the sheath for signal transmission. There are pins (i.e., PIN pins) in the socket that match the low-voltage harness terminals. In the manufacturing process of the low-voltage terminal harness, a spring probe is used to confirm whether the circuit conduction is correct during the harness conduction test. Generally, a spring probe with a general specification is used to detect the low-voltage harness terminals. If the diameter of the spring probe does not match the low-voltage harness terminal to be measured, it will affect the aperture of the terminal, and there is a risk of being reamed or damaging the internal structure. For example, using a spring probe with a specification of 0.5 mm to detect a low-voltage harness terminal with a matching PIN pin specification of 0.35 will cause the low-voltage harness terminal with a matching PIN pin specification of 0.35 to be reamed; during the harness assembly, the insertion process of the sheath and the socket can only rely on manual operation, and the method is horizontal insertion. After the insertion is completed, the single low-voltage harness terminal at the wire inlet end of the sheath is unevenly stressed, which will cause the low-voltage harness terminal to bend, break, or have poor contact and damage, as well as the sheath to deform or rupture, resulting in the failure of the internal structure of the low-voltage harness terminal. The failure of the low-voltage harness terminal caused by the above situations cannot be judged by the naked eye, and there is also a situation where the test is qualified before shipment, but after some working conditions during vehicle installation, communication signal interruption occurs, that is, poor contact. This solution inserts a portable low-voltage harness terminal detection device into the hole position of the low-voltage harness terminal corresponding to the failure signal for reaming test to detect whether the inside of the low-voltage harness terminal is reamed.

[0031] The outer surface of the column body of the connecting part 5 is provided with threads. The function of the connecting part 5 is similar to that of a bolt and is used to cooperate with the counterweight nut 2.

[0032] The counterweight nut 2 is a columnar body with a hole in the middle, and the inner wall of the hole is provided with threads. The counterweight nut 2 is detachably fixed to the column of the connecting part 5 through the threads. The counterweight nut 2 can be set as a cylinder or a hexagonal prism, and its function is similar to that of a nut. In this embodiment, the counterweight nut 2 is set as a hollow hexagonal prism. The outer surface of the hexagonal prism-shaped counterweight nut has a greater frictional force, which can prevent hand slippage when the counterweight nut 2 is tightened onto the column of the connecting part 5. The fixing principle of the counterweight nut 2 and the connecting part 5 is the same as that of a bolt and a nut, and they are fixed by mutual cooperation of the threads, which not only ensures firm fixation but also is easy to assemble and disassemble.

[0033] One end of the pin terminal part 7 is connected to the connecting part 5, and the other end is a pin part. The pin part is used to connect to the jack of the low-voltage wire harness terminal to be detected, or the other end of the pin terminal part 7 is a jack part, and the jack part is used to connect to the pin of the low-voltage wire harness terminal to be detected.

[0034] The pin part of the pin terminal part 7 includes a pin terminal upper limit end or a pin terminal lower limit end. The cross-sectional area of the pin part of the pin terminal upper limit end is the maximum tolerance dimension of the designed cross-sectional area of the jack of the low-voltage wire harness terminal to be detected; the cross-sectional area of the pin part of the pin terminal lower limit end is the minimum tolerance dimension of the designed cross-sectional area of the jack of the low-voltage wire harness terminal to be detected. The sizes of the pin terminal upper limit end and the pin terminal lower limit end are the same as the maximum and minimum values of the PIN needle sizes matching the low-voltage wire harness terminal to be measured, respectively, and are used to insert the low-voltage wire harness terminal detection device into the jack of the low-voltage wire harness terminal to be measured, and will not cause the jack of the low-voltage wire harness terminal to be measured to expand when detecting the low-voltage wire harness terminal to be measured. The pin part of the pin terminal part 7 of the present invention is designed according to the two limit sizes of the pins (i.e., PIN needles) matching the low-voltage wire harness terminals.

[0035] Low-voltage wire harness terminals of different specifications are matched with pins (i.e., PIN needles) of different specifications. When measuring low-voltage wire harness terminals of different specifications, different specifications of pin terminals that match them can be replaced. The lengths of the pin terminal upper limit end and the pin terminal lower limit end should be the same as the lengths of the PIN needles matching the low-voltage wire harness terminal to be measured, otherwise the pin part of the pin terminal part 7 cannot be firmly inserted into the low-voltage wire harness terminal to be measured, resulting in inaccurate measurement results.

[0036] The size of the upper end of the pin terminal is the maximum value of the PIN needle size required to match the terminal of the low-voltage wire harness to be measured, and the size of the lower end of the pin terminal is the minimum value of the PIN needle size required to match the terminal of the low-voltage wire harness to be measured. According to the specification of the low-voltage wire harness terminal to be measured, the value range of the PIN needle size required to match the low-voltage wire harness terminal to be measured can be obtained. In this embodiment, the low-voltage wire harness terminal to be measured is a low-voltage wire harness terminal with a cross-sectional wire diameter (i.e., the diameter of the circular cross-section of the low-voltage wire harness terminal to be measured) of 0.35 mm. The PIN needle size required to match the low-voltage wire harness terminal to be measured marked in its specification is T (terminal diameter) * W (terminal length) = 0.35 ± 0.03 * 0.5 ± 0.05 mm). The cross-section of the PIN needle is rectangular, T is the value of the wide side of the rectangular cross-section of the PIN needle, and W is the value of the long side of the rectangular cross-section of the PIN needle. In this embodiment, according to the specification of the low-voltage wire harness terminal to be measured, it can be obtained that the size of the upper end of the pin terminal is T (terminal diameter) * W (terminal length) = 0.38 * 0.55, and the size of the lower end of the pin terminal is T (terminal diameter) * W (terminal length) = 0.32 * 0.45 mm.

[0037] A preferred embodiment of the low-voltage wire harness terminal detection device: As Figure 1 shown, the pin terminal part 7 includes an upper end of the pin terminal and a lower end of the pin terminal. The upper end of the pin terminal and the lower end of the pin terminal are integrally processed with its connecting part 5 respectively. The connecting parts 5 of the upper end of the pin terminal and the lower end of the pin terminal are respectively connected with a plurality of counterweight nuts 6, and the self-gravity of the plurality of counterweight nuts 6 is the same as the holding force of the low-voltage wire harness terminal to be measured.

[0038] Another preferred embodiment: As Figure 2 shown, the upper end of the pin terminal and the lower end of the pin terminal are separated from its connecting part 5. Both ends of the connecting part 5 are provided with a first bolt hole 3 and a second bolt hole 4. Both the first pin terminal 1 and the second pin terminal 2 are pins with threads at one end. The cylindrical ends with threads of the first pin terminal 1 and the second pin terminal 2 are respectively matched with the first bolt hole 3 or the second bolt hole 4 to realize the detachable connection between the first pin terminal 1 and the second pin terminal 2 and the connecting part 5. The first pin terminal 1 and the second pin terminal 2 are respectively the upper end of the pin terminal and the lower end of the pin terminal.

[0039] The method of using the above-mentioned low-voltage harness terminal detection device includes: inserting the upper end and the lower end of the pin terminal of the low-voltage harness terminal detection device into the jacks of the low-voltage harness terminal to be detected respectively, so that the inserted jacks of the low-voltage harness terminal to be detected are connected to the upper end or the lower end of the pin terminal respectively. Lift the low-voltage harness terminal to be tested so that the low-voltage harness terminal detection device inserted into the low-voltage harness terminal to be tested is suspended vertically from the ground. Under the action of gravity, judge whether the jack of the low-voltage harness terminal to be tested is enlarged and whether it has a certain holding force according to whether the low-voltage harness terminal detection device comes off. When a PIN needle is inserted into the low-voltage harness terminal, to ensure a firm connection between the low-voltage harness terminal and the PIN needle, the low-voltage harness terminal has a certain holding force. The holding force is closely related to whether the jack of the low-voltage harness terminal is enlarged. When the jack of the low-voltage harness terminal is enlarged to a certain extent, the holding force of the low-voltage harness terminal will completely disappear, resulting in the low-voltage harness terminal being unusable. The holding force of the PIN needle of the low-voltage harness terminal is a basic requirement for the design of the PIN needle of the low-voltage harness terminal. The holding forces of low-voltage harness terminals of different specifications can be obtained from their product specifications or product manuals.

[0040] When using the low-voltage harness terminal detection device to detect the low-voltage harness terminal to be tested, the self-gravity of the counterweight nut is the same as the holding force of the low-voltage harness terminal to be tested. The self-gravity of the counterweight nut is the same as the holding force of the low-voltage harness terminal to be tested. When the low-voltage harness terminal detection device is suspended vertically from the ground, if the low-voltage harness terminal detection device does not fall off from the jack of the low-voltage harness terminal to be tested, it means that the low-voltage harness terminal to be tested has a holding force. If the low-voltage harness terminal to be tested has a holding force, it means that the jack of the low-voltage harness terminal to be tested is not enlarged or the degree of enlargement is low. Multiple counterweight nuts can be provided. In some embodiments, the counterweight nut is made of stainless steel, and counterweight nuts with multiple small counterweights can be designed, including but not limited to counterweight nuts with self-gravities of 1N and 0.5N. When in use, multiple counterweight nuts with small counterweights can be combined to achieve the required holding force of the low-voltage harness terminal to be tested. The volumes of the pin terminal portion 7 and the connecting portion 5 are very small, and their gravity can be ignored.

[0041] A method for judging whether the jack of the low-voltage wire harness terminal to be measured is reamed and whether it has a certain holding force according to whether the detection device is disengaged includes: when the lower limit end of the pin terminal of the low-voltage wire harness terminal detection device is disengaged from the jack of the low-voltage wire harness terminal to be measured under the action of gravity, the jack of the low-voltage wire harness terminal to be measured has been reamed, and then according to the disengagement situation of the upper limit end of the pin terminal, it is judged whether the low-voltage wire harness terminal to be measured can be used; when the lower limit end of the pin terminal of the low-voltage wire harness terminal detection device is not disengaged from the jack of the low-voltage wire harness terminal to be measured under the action of gravity, the jack of the low-voltage wire harness terminal to be measured has not been reamed, the jack of the low-voltage wire harness terminal to be measured has a holding force, and the low-voltage wire harness terminal to be measured can be used. The lower limit end of the pin terminal is the lower limit value of the PIN needle size matched with the low-voltage wire harness terminal to be measured, that is, the PIN needle size is small. If the lower limit end of the pin terminal is not disengaged from the jack of the low-voltage wire harness terminal to be measured under the action of gravity, it means that the low-voltage wire harness terminal to be measured has a holding force, the holding state is good, the low-voltage wire harness terminal to be measured is basically not reamed, and it can be used. At this time, there is no need to use the upper limit end of the pin terminal to detect the low-voltage wire harness terminal to be measured; if the lower limit end of the pin terminal is disengaged from the jack of the low-voltage wire harness terminal to be measured under the action of gravity, it means that the holding force of the low-voltage wire harness terminal to be measured has decreased and there is a reaming phenomenon, but it does not mean that the low-voltage wire harness terminal to be measured cannot be used. It is necessary to combine the disengagement situation of the upper limit end of the pin terminal to judge whether the low-voltage wire harness terminal to be measured cannot be used at all.

[0042] When the lower end of the pin terminal of the low-voltage harness terminal detection device disengages from the jack of the low-voltage harness terminal to be tested under the action of gravity, the method for judging whether the low-voltage harness terminal to be tested can be used according to the disengagement situation of the upper end of the pin terminal includes: when the lower end of the pin terminal of the low-voltage harness terminal detection device disengages from the jack of the low-voltage harness terminal to be tested under the action of gravity and the upper end of the pin terminal of the low-voltage harness terminal detection device does not disengage from the jack of the low-voltage harness terminal to be tested under the action of gravity, the jack of the low-voltage harness terminal to be tested has been reamed, the jack of the low-voltage harness terminal to be tested still has a certain holding force, and the low-voltage harness terminal to be tested can be used; when the lower end of the pin terminal of the low-voltage harness terminal detection device disengages from the jack of the low-voltage harness terminal to be tested under the action of gravity and the upper end of the pin terminal of the low-voltage harness terminal detection device disengages from the jack of the low-voltage harness terminal to be tested under the action of gravity, the jack of the low-voltage harness terminal to be tested has been reamed, the jack of the low-voltage harness terminal to be tested does not have a holding force, and the low-voltage harness terminal to be tested cannot be used. When the lower end of the pin terminal disengages from the jack of the low-voltage harness terminal to be tested under the action of gravity, it indicates that the low-voltage harness terminal to be tested has a reaming phenomenon and the holding force decreases. At this time, the upper end of the pin terminal needs to be used to further detect the low-voltage harness terminal to be tested. The upper end of the low-voltage harness terminal is the upper limit value of the PIN pin size matched to the low-voltage harness terminal to be tested, that is, the PIN pin size is larger. If the upper end of the pin terminal disengages from the jack of the low-voltage harness terminal to be tested under the action of gravity, it indicates that the low-voltage harness terminal to be tested does not have a holding force, the low-voltage harness terminal to be tested is severely reamed, and cannot be used; if the lower end of the pin terminal disengages from the jack of the low-voltage harness terminal to be tested under the action of gravity and the upper end of the pin terminal does not disengage from the jack of the low-voltage harness terminal to be tested under the action of gravity, it indicates that the low-voltage harness terminal to be tested still has a certain holding force, the reaming degree is low, and within the normal use range, the low-voltage harness terminal to be tested can still be used.

[0043] Embodiment 2

[0044] A preferred embodiment: The model of the low-voltage harness terminal to be tested is Amphenol 10163003-002LF. From its specification sheet, it can be obtained that the PIN pin size required to be matched for this low-voltage harness terminal cannot exceed T (terminal diameter) * W (terminal length) 0.35 ± 0.03 * 0.5 ± 0.05 mm), the holding force of this low-voltage harness terminal is greater than or equal to 2 N, then the gravity of the counterweight bolt part of the low-voltage harness terminal detection device is 2 N, the size of the upper end of the low-voltage harness terminal detection device is T (terminal diameter) * W (terminal length) = 0.38 * 0.55 mm, and the size of the lower end of the low-voltage harness terminal detection device is (terminal diameter) * W (terminal length) = 0.32 * 0.45 mm.

[0045] When there is a situation where the signal of the low-voltage wire harness terminal appears intermittently during vehicle installation and use, the motor controller will automatically mark the label of the single low-voltage wire harness terminal with a fault. The marked single low-voltage wire harness terminal is the low-voltage wire harness terminal to be tested. Insert the lower end of the low-voltage wire harness terminal detection device into the low-voltage wire harness terminal to be tested, and make the low-voltage wire harness terminal detection device hang vertically in the air. If the low-voltage wire harness terminal detection device does not fall, the low-voltage wire harness terminal to be tested is not reamed and has good holding force. If the low-voltage wire harness terminal detection device falls, insert the upper end of the low-voltage wire harness terminal detection device into the low-voltage wire harness terminal to be tested, and make the low-voltage wire harness terminal detection device hang vertically in the air. If the low-voltage wire harness terminal detection device does not fall, the low-voltage wire harness terminal to be tested has a relatively low degree of reaming and still has good holding force and can continue to be used. If the low-voltage wire harness terminal detection device falls, the low-voltage wire harness terminal to be tested has a relatively high degree of reaming and has lost its holding force and cannot continue to be used. When the upper end of the low-voltage wire harness terminal detection device also falls out of the low-voltage wire harness terminal to be tested, it indicates that the holding force of the low-voltage wire harness terminal to be tested is less than 2N, and there is a risk of poor contact, that is, the contact resistance between the terminal and the PIN is insufficient, and there is a risk of virtual connection. The signal will appear intermittently during use and needs to be replaced.

[0046] When there is a situation where the signal of the low-voltage wire harness terminal appears intermittently during vehicle installation and use, if the low-voltage wire harness terminal detection device is not used, the entire wire harness needs to be removed, the terminal corresponding to the fault signal needs to be removed, and a destructive test needs to be carried out to know whether the actual size inside the terminal is within the required range. The process is cumbersome and time-consuming. The low-voltage wire harness terminal detection device designed in this solution is not only easy to carry and simple to operate, but also has a very low production cost and the production process is easy to implement.

[0047] In some other embodiments, the structure of the low-voltage wire harness terminal detection device is a connecting part with jacks at both ends that can be inserted and removed from the PIN pins. The sizes of the jacks at both ends of the connecting part are designed according to the two limit sizes of the pins (i.e., PIN pins) that match the low-voltage wire harness terminal. The connecting part is detachably connected to the counterweight bolt. Insert the jacks at both ends of the low-voltage wire harness terminal detection device into the pins in the jacks of the low-voltage wire harness terminal respectively. After hanging the low-voltage wire harness terminal detection device vertically in the air, judge whether the low-voltage wire harness terminal can be used according to whether the pin falls out of the jack of the low-voltage wire harness terminal.

[0048] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

Claims

1. A low voltage wiring harness terminal rapid detection device, characterized in that: It includes: The pin terminal part (7) is detachably connected to the weight nut (6) via the connecting part (5), and the pin terminal part (7) is used to connect to the pin of the low-voltage wiring harness terminal to be detected, or to connect to the socket of the low-voltage wiring harness terminal to be detected.

2. A low-voltage wiring harness terminal rapid detection device according to claim 1, characterized in that: The cylindrical outer surface of the connecting portion (5) is provided with threads.

3. A low-voltage wiring harness terminal rapid detection device according to claim 1, characterized in that: The counterweight nut (2) is a columnar body with a hole in the middle, and the inner wall of the hole is provided with threads. The counterweight nut (2) is detachably fixed to the columnar body of the connecting part (5) via the threads.

4. A low-voltage wiring harness terminal rapid detection device according to claim 1, characterized in that: One end of the pin terminal part (7) is connected to the connecting part (5), and the other end is a pin part, which is used to connect to the socket of the low-voltage wiring harness terminal to be detected, or the other end of the pin terminal part (7) is a socket part, which is used to connect to the pin of the low-voltage wiring harness terminal to be detected.

5. A low-voltage wiring harness terminal rapid detection device according to claim 4, characterized in that: The pin portion of the pin terminal portion (7) includes a pin terminal upper limit end or a pin terminal lower limit end.

6. A low-voltage wiring harness terminal rapid detection device according to claim 5, characterized in that: The cross-sectional area of ​​the pin portion at the upper limit end of the pin terminal is the maximum tolerance dimension of the designed cross-sectional area of ​​the low-voltage wiring harness terminal socket being tested; the cross-sectional area of ​​the pin portion at the lower limit end of the pin terminal is the minimum tolerance dimension of the designed cross-sectional area of ​​the low-voltage wiring harness terminal socket being tested.

7. A method for using a low-voltage wiring harness terminal rapid detection device according to any one of claims 1 to 6, characterized in that: The upper limit end and the lower limit end of the pin terminal of the pin terminal of the low-voltage wiring harness terminal detection device are respectively inserted into the jack of the low-voltage wiring harness terminal to be detected, so that the jack of the low-voltage wiring harness terminal to be detected is respectively connected to the upper limit end or the lower limit end of the pin terminal, and the low-voltage wiring harness terminal to be tested is lifted so that the low-voltage wiring harness terminal detection device inserted into the low-voltage wiring harness terminal to be tested is suspended vertically on the ground. Under the action of gravity, whether the jack of the low-voltage wiring harness terminal to be tested is expanded and whether it has a certain holding force is determined according to whether the low-voltage wiring harness terminal detection device is disengaged.

8. The method of using a low-voltage wiring harness terminal rapid detection device according to claim 7, characterized in that: When the low-voltage wiring harness terminal detection device is used to detect the low-voltage wiring harness terminal to be detected, the self-weight of the counterweight nut is the same as the holding force of the low-voltage wiring harness terminal to be detected.

9. The method of using a low-voltage wiring harness terminal rapid detection device according to claim 7, characterized in that: The method for judging whether the socket of the low-voltage wiring harness terminal to be tested is enlarged and whether it has a certain holding force according to whether the detection device is disengaged includes: when the lower limit end of the pin terminal of the low-voltage wiring harness terminal detection device is disengaged from the socket of the low-voltage wiring harness terminal to be tested under the action of gravity, the socket of the low-voltage wiring harness terminal to be tested has been enlarged, and then judging whether the low-voltage wiring harness terminal to be tested can be used according to the disengagement of the upper limit end of the pin terminal; when the lower limit end of the pin terminal of the low-voltage wiring harness terminal detection device does not fall out of the socket of the low-voltage wiring harness terminal to be tested under the action of gravity, the socket of the low-voltage wiring harness terminal to be tested has not been enlarged, the socket of the low-voltage wiring harness terminal to be tested has a holding force, and the low-voltage wiring harness terminal to be tested can be used.

10. The method of using a low-voltage wiring harness terminal rapid detection device according to claim 9, characterized in that: When the lower limit end of the pin terminal of the low-voltage wiring harness terminal detection device is disengaged from the jack of the low-voltage wiring harness terminal to be tested under the action of gravity, the method for judging whether the low-voltage wiring harness terminal to be tested can be used according to the disengagement of the upper limit end of the pin terminal includes: when the lower limit end of the pin terminal of the low-voltage wiring harness terminal detection device is disengaged from the jack of the low-voltage wiring harness terminal to be tested under the action of gravity, and the upper limit end of the pin terminal of the low-voltage wiring harness terminal detection device does not disengage from the jack of the low-voltage wiring harness terminal to be tested under the action of gravity, the The socket has been enlarged, and the socket of the low-voltage wiring harness terminal to be tested still has a certain holding force, so the low-voltage wiring harness terminal to be tested can be used; when the lower limit end of the pin terminal of the low-voltage wiring harness terminal detection device is disengaged from the socket of the low-voltage wiring harness terminal to be tested under the action of gravity, and the upper limit end of the pin terminal of the low-voltage wiring harness terminal detection device is disengaged from the socket of the low-voltage wiring harness terminal to be tested under the action of gravity, the socket of the low-voltage wiring harness terminal to be tested has been enlarged, the socket of the low-voltage wiring harness terminal to be tested does not have a holding force, and the low-voltage wiring harness terminal to be tested cannot be used.

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