Device and method for measuring insertion and extraction force of contact element of electric connector

Abstract

The invention discloses a device and a method for measuring the insertion and extraction force of an electric connector contact element, and belongs to the technical field of electric connector testing. The device comprises a suspension support, a roller, a dripping weight assembly, a pull rope, a hand-cranking landing gear and a digital display dynamometer, in the testing process, the digital display dynamometer is used for preliminarily measuring the insertion and extraction force of a contact element, and the initial value is used as a reference for initial value setting when the insertion and extraction force of the dripping weight is measured; then, the drop weight assembly is used as a weight for testing the insertion and extraction force of the contact element, the weight of the weight is changed through drop water until the pin is separated from the jack, and the insertion and extraction force detection result of the contact element of the electric connector can be obtained. The insertion and extraction force detection method can reduce test deviation caused by manual operation errors, meanwhile, compared with a common weight, the water dripping weight is small in weight change gradient, and the test precision of the insertion and extraction force can be improved.

Description

Technical Field

[0001] The invention relates to a device and a method for measuring the plugging and pulling force of an electric connector contact, belonging to the technical field of electric connector testing. Background Art

[0002] Electrical connectors are key components for power and signal transmission and are widely used in aerospace, aviation, electronics, communications and other fields. In the aerospace field, high requirements are placed on the reliability and stability of the electrical performance of electrical connectors. The plugging and unplugging force is an important parameter that characterizes the reliability and stability of the electrical connection of the electrical connector contacts. After repeated plugging and unplugging of electrical connectors, the plugging and unplugging force of the contacts shows a downward trend at the end of their mechanical life, which directly affects the reliability of the electrical connection between the contact pins and sockets. Therefore, the measurement of the plugging and unplugging force of the contacts before the use of the electrical connector plays a vital role in the quality control and application reliability of the electrical connector.

[0003] The existing methods for testing the plugging and unplugging forces of electrical connectors are mainly the traditional digital instrument method and the hanging weight method. In the digital instrument method, a pin is inserted under the socket of the electrical connector to be tested, and a digital dynamometer is placed under the pin. The digital dynamometer is manually pulled downward until the pin separates and falls off. The digital dynamometer displays the plugging and unplugging force value, which is affected by factors such as the manual pulling speed and direction. In the hanging weight method, a pin is inserted under the socket of the electrical connector to be tested, and a weight is hung under the pin. The electrical connector is manually lifted. If the pin of the hanging weight separates and falls off during the lifting process, it means that the plugging and unplugging force is lower than the plugging and unplugging force corresponding to the weight. Otherwise, it means that the plugging and unplugging force is higher than the plugging and unplugging force corresponding to the weight. This is affected by the selection of the weight and has low efficiency.

[0004] The accuracy of the test results of traditional digital display instruments or hanging weight plug-in and pull-out force detection methods is heavily dependent on manual operation, and the test accuracy can no longer meet the requirements of spacecraft for the plug-in and pull-out force test accuracy of electrical connector contacts. Therefore, it is necessary to propose a high-precision plug-in and pull-out force measurement method for electrical connector contacts. Summary of the invention

[0005] The technical problem solved by the present invention is: to overcome the shortcomings of the prior art, and to propose a device and method for measuring the plugging and extraction force of an electrical connector contact, which uses a digital display instrument combined with a dripping weight for measurement, thereby solving the problem of low plugging and extraction force measurement accuracy of existing electrical connector contacts, and meeting the needs of on-orbit applications of electrical connectors in the aerospace field.

[0006] The technical solution of the present invention is:

[0007] An electric connector contact plugging and unplugging force measuring device comprises a suspension bracket, a roller, a dripping weight assembly, a pull rope, a hand-cranked landing gear and a digital display dynamometer;

[0008] The roller is fixed to the top of the suspension bracket and is provided with a groove in the circumferential direction;

[0009] The pull rope is embedded in the groove of the roller, and one end is directly connected to the pin of the contact of the electrical connector to be tested or connected to the pin through a digital dynamometer; if it is directly connected to the pin, the other end of the pull rope is connected to the dripping weight assembly; if it is connected to the pin through a digital dynamometer, the other end of the pull rope is connected to the hand-cranked landing gear;

[0010] The contact of the electrical connector to be tested is fixedly placed, with the jack end facing upward and located directly above the pin;

[0011] The dripping weight assembly is used to measure the insertion and extraction force of the pin from the socket.

[0012] Further, the dripping weight assembly includes a container, a sponge, and a dripper;

[0013] The sponge is placed in a suspended container, the outer side of the container is connected to one end of a pull rope, and the other end of the pull rope is connected to a pin;

[0014] The dripper contains water, and drips water to the sponge, and the sponge absorbs the water and increases its weight; when the insertion pin is separated from the insertion hole, the dripper stops dripping water, and the weight of the container and the sponge is measured.

[0015] Furthermore, the measuring device also includes a weighing scale. When the pin is disengaged from the socket, the weighing scale weighs the container containing the absorbent sponge, and calculates the insertion and extraction force value of the contact of the electrical connector to be tested based on the weight.

[0016] Furthermore, the top surface of the container can be opened and closed. When the top surface is open, the sponge is placed inside the container, and when the top surface is closed and locked, a closed space is formed. An operating hole is arranged on the top surface of the container to enable the dripper to inject water into the sponge.

[0017] Furthermore, the digital dynamometer is fixed to a suspension bracket with the force measuring end facing downward, and the pin is hung by a pull rope.

[0018] A method for measuring the insertion and extraction force of an electrical connector contact based on a device for measuring the insertion and extraction force of an electrical connector contact comprises:

[0019] Connect one end of the pull rope to the pin through a digital dynamometer, and connect the other end of the pull rope to the hand-cranked landing gear; perform a plugging and unplugging force test on the contact of the electrical connector to be tested through the digital dynamometer, and use the value displayed by the digital dynamometer when the plug is disconnected from the socket as the reference value of the plugging and unplugging force;

[0020] Remove the digital dynamometer and hand-cranked landing gear connected to both ends of the pull rope, connect one end of the pull rope to the pin and the other end to the dripping weight assembly. The initial weight of the dripping weight assembly is determined according to the plug-in force reference value; increase the weight of the dripping weight assembly by dripping water until the pin is disengaged from the socket, and calculate the plug-in force measurement result of the electrical connector contact based on the weight of the dripping weight assembly at this moment.

[0021] Furthermore, the plugging and extraction force test of the contact of the electrical connector to be tested is carried out by a digital dynamometer. The test method is: first, insert the pin vertically into the socket, rotate the hand-crank landing gear, and slowly remove the pin from the socket at a uniform speed, and record the value displayed on the digital dynamometer when the plug is completely disconnected from the socket; repeat the above test at least 3 times. If the maximum difference between the recorded values ​​is less than the design index requirement, the test is judged to be valid, and the average of the test results is taken as the reference value of the plugging and extraction force.

[0022] Furthermore, the amount of water in each drop of water is controlled, and the amount of water added each time gradually decreases with the number of times water is added, so that the weight of the dripping weight assembly changes in a gradient of no more than 0.001g / time, thereby achieving accurate measurement of the insertion and extraction force.

[0023] Furthermore, by controlling the amount of water in each drop of water, the initial weight of the dripping weight assembly is determined according to the plugging and unplugging force reference value, and the determination method is: take 80% to 85% of the plugging and unplugging force reference value as the reference value, and obtain the corresponding initial weight of the dripping weight assembly according to the reference value.

[0024] Furthermore, the weight of the dripping weight assembly is increased by dripping water, and the weight is maintained for no less than 5 seconds after each dripping. After confirming that the pin is not detached, drip water again.

[0025] The advantages of the present invention compared with the prior art are:

[0026] (1) The present invention sequentially performs plug-in and pull-out force measurement using a digital instrument and a dripping weight, and uses the measured value obtained from the plug-in and pull-out force test of the digital instrument as a benchmark reference for the initial weight of the dripping weight assembly, thereby improving the plug-in and pull-out force measurement accuracy and efficiency of electrical connector contacts.

[0027] (2) The present invention connects the plug and the dripping weight assembly through a pull rope, and the pull rope is placed in the roller groove. Compared with the prior art, the test deviation caused by human operation errors can be reduced.

[0028] (3) Compared with the measurement method of ordinary weights and dripping weights, the present invention uses a method of dripping water to soak the sponge, so that the weight change gradient of the dripping weight assembly is small, which can improve the test accuracy of the insertion and extraction force. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0030] Figure 1 A schematic diagram of a water dripping measurement performed by a device for measuring the insertion and extraction force of an electrical connector contact according to an embodiment of the present invention;

[0031] Figure 2 A schematic diagram of weighing a sponge and a container using a balance according to an embodiment of the present invention;

[0032] Figure 3 It is a schematic diagram of digital display measurement of the plugging and extraction force measuring device of the electrical connector contact according to the embodiment of the present invention. DETAILED DESCRIPTION

[0033] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0034] The present invention provides a device for measuring the insertion and extraction force of an electrical connector contact. Figure 1 to Figure 3 As shown, it includes a suspension bracket 1, a roller 2, a dripping weight assembly, a pull rope 5, a digital dynamometer 8, a hand-cranked landing gear 9 and a weighing balance 10. Among them, the dripping weight assembly is used to measure the insertion and extraction force of the pin from the socket, and includes a container 3, a sponge 4 and a syringe.

[0035] The roller 2 is fixed on the top of the suspension bracket 1, and a groove is provided in the circumferential direction. The pull rope 5 is embedded in the groove of the roller, and one end is directly connected to the pin 6 or connected to the pin 6 through the digital dynamometer 8; if it is directly connected to the pin 6, the other end of the pull rope 5 is connected to the dripping weight assembly; if it is connected to the pin 6 through the digital dynamometer 8, the other end of the pull rope 5 is connected to the hand-cranked landing gear 9. The contact of the electrical connector to be tested is fixedly placed, and the end face of the socket 7 faces upward and is located directly above the pin 6. The container 3 and the sponge 4 constitute a dripping weight, and the syringe is an accessory for the dripping weight. The top surface of the container 3 can be opened and closed. The sponge 4 can be placed inside the container when the top surface is open. When the top surface is closed and locked, a closed space is formed to reduce the influence of environmental humidity on the water inside the container and ensure the weight accuracy of the dripping weight. An operating hole is set on the top surface of the container to enable the syringe to inject water into the sponge 4.

[0036] The method for measuring the insertion and extraction force of electrical connector contacts using the measuring device is as follows:

[0037] S1: Perform plug-in and pull-out force measurement with a digital instrument to preliminarily determine the plug-in and pull-out force value between the contact pin and the socket, which serves as a reference for setting the initial value when testing the plug-in and pull-out force with a drip weight.

[0038] 1.1: Device Figure 3 The force measuring end of the digital dynamometer 8 is fixed downward on the suspension bracket 1, and the pin 6 is hung by the pull rope 5, and the pull rope 5 connected at the other end is embedded in the groove of the roller 2 and the hand-cranked landing gear 9. The socket 7 is fixed and kept vertically placed with the end face facing upward, and the positions of the socket 7 and the pin 6 should correspond in the vertical direction.

[0039] 1.2: Keep the socket 7 facing upwards and the end face horizontal, insert the pin 6 into the socket 7, and be careful not to tilt it to avoid damaging the socket.

[0040] 1.3: Slowly rotate the hand-cranked landing gear 9 to slowly and uniformly remove the pin 6 from the socket 7. This is a test of the contacts (pins and sockets). Record the test results. Perform three tests on each pair of contacts. If the maximum difference between the three plugging and unplugging force values ​​is less than the design index requirement, the plugging and unplugging force test is considered valid. Take the average of the test results as the plugging and unplugging force reference value.

[0041] S2: Perform dripping weight insertion and extraction force measurement. Use a water-added sponge as the weight for the contact insertion and extraction force test. Change the weight of the weight by dripping water. By controlling the weight to change in a gradient of 0.001g / time, the insertion and extraction force can be accurately measured.

[0042] 2.1: Press the device again Figure 1 The pull rope 5 is set up by connecting one end to the insertion pin 6 and the other end to the container 3; the pull rope 5 is embedded in the groove of the roller 2, and the container 3 (including the sponge 4) is slowly suspended in the air.

[0043] 2.2: Add water to the container 3 (including the sponge 4), and take 85% of the insertion and extraction force test result of the digital instrument as the starting weight reference benchmark of the container 3 (including the sponge 4 and water).

[0044] 2.3: Measure and record the initial weight of the container 3 (including the sponge 4) after adding water using a weighing balance 10;

[0045] 2.4: Fix the end surface of the socket 7 vertically upwards and insert the pin 6 into the socket;

[0046] 2.5: Aim the needle of the syringe at the sponge 4 in the container 3 to add water. The amount of water added each time gradually decreases with the number of times of adding water. Keep it for 5 seconds after each water addition to ensure that the pin 6 is not disengaged. It is determined that the insertion and extraction force between the pin 6 and the socket 7 is greater than the current weight of the container 3 (including the sponge 4 and water); if the pin 6 and the socket 7 are disengaged during the water addition process, stop adding water;

[0047] 2.6: Weigh the container 3 (containing the sponge 4 and water), and calculate the insertion and extraction force value of the contact to be tested based on the weight, such as Figure 2 shown.

[0048] The above-described embodiments are only preferred specific implementations of the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for measuring the insertion and extraction force of an electrical connector contact, characterized in that: Includes suspension bracket, roller, drip weight assembly, pull rope, hand-cranked landing gear and digital display dynamometer; The roller is fixed to the top of the suspension bracket and is provided with a groove in the circumferential direction; The pull rope is embedded in the groove of the roller, and one end is directly connected to the pin of the contact of the electrical connector to be tested or connected to the pin through a digital dynamometer; if it is directly connected to the pin, the other end of the pull rope is connected to the dripping weight assembly; if it is connected to the pin through a digital dynamometer, the other end of the pull rope is connected to the hand-cranked landing gear; The contact of the electrical connector to be tested is fixedly placed, with the jack end facing upward and located directly above the pin; The dripping weight assembly is used to measure the insertion and extraction force of the pin from the socket.

2. The device for measuring the insertion and extraction force of electrical connector contacts according to claim 1, characterized in that: The dripping weight assembly includes a container, a sponge, and a dripper; The sponge is placed in a suspended container, the outer side of the container is connected to one end of a pull rope, and the other end of the pull rope is connected to a pin; The dripper contains water, and drips water to the sponge, and the sponge absorbs the water and increases its weight; when the insertion pin is separated from the insertion hole, the dripper stops dripping water, and the weight of the container and the sponge is measured.

3. The device for measuring the insertion and extraction force of electrical connector contacts according to claim 2, characterized in that: The measuring device also includes a weighing scale. When the pin is separated from the socket, the weighing scale weighs the container containing the absorbent sponge, and calculates the insertion and extraction force value of the contact piece of the electrical connector to be tested based on the weight.

4. The device for measuring the insertion and extraction force of electrical connector contacts according to claim 2, characterized in that: The top surface of the container can be opened and closed. When the top surface is opened, the sponge is placed inside the container, and when the top surface is closed and locked, a closed space is formed. An operating hole is arranged on the top surface of the container to enable the dripper to inject water into the sponge.

5. The electrical connector contact insertion and extraction force measuring device according to claim 1, characterized in that: The digital dynamometer is fixed on a suspension bracket with the force measuring end facing downward, and the pin is hung by a pull rope.

6. A method for measuring the insertion and extraction force of electrical connector contacts based on the device for measuring the insertion and extraction force of electrical connector contacts according to claim 1, characterized in that: include: Connect one end of the pull rope to the pin through the digital dynamometer, and the other end of the pull rope to the hand-cranked landing gear; The plugging and extraction force test of the contact of the electrical connector to be tested is carried out by using a digital dynamometer, and the value displayed by the digital dynamometer when the plug is disconnected from the socket is used as the reference value of the plugging and extraction force; Remove the digital dynamometer and hand-cranked landing gear connected to both ends of the pull rope, connect one end of the pull rope to the pin and the other end to the dripping weight assembly. The initial weight of the dripping weight assembly is determined according to the plug-in force reference value; increase the weight of the dripping weight assembly by dripping water until the pin is disengaged from the socket, and calculate the plug-in force measurement result of the electrical connector contact based on the weight of the dripping weight assembly at this moment.

7. The measuring method according to claim 6, characterized in that: The plugging and extraction force test of the electrical connector contact to be tested is carried out by a digital dynamometer. The test method is: first, insert the pin vertically into the socket, turn the hand-cranked landing gear, and slowly remove the pin from the socket at a uniform speed, and record the value displayed on the digital dynamometer when the plug is completely disengaged from the socket; repeat the above test at least 3 times. If the maximum difference between the recorded values ​​is less than the design index requirement, the test is judged to be valid, and the average value of each test result is taken as the plugging and extraction force reference value.

8. The measuring method according to claim 6, characterized in that: The amount of water in each drop of water is controlled, and the amount of water added each time gradually decreases with the number of times water is added, so that the weight of the dripping weight assembly changes in a gradient of no more than 0.001g / time, thereby achieving accurate measurement of the insertion and extraction force.

9. The measuring method according to claim 6, characterized in that: By controlling the amount of water in each drop of water, the initial weight of the dripping weight assembly is determined according to the plugging and unplugging force reference value. The determination method is: take 80% to 85% of the plugging and unplugging force reference value as the reference value, and obtain the corresponding initial weight of the dripping weight assembly according to the reference value.

10. The measuring method according to claim 6, characterized in that: Increase the weight of the dripping weight assembly by dripping water. Keep it for no less than 5 seconds after each drip. After confirming that the pin is not disengaged, drip water again.

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