Device for testing retention force of electric connector

Abstract

The utility model discloses an electric connector retention testing device in the field of test and maintenance equipment, and the device comprises a housing which is internally and movably provided with a built-in load beam. The strain gauge type sensor is fixedly installed in the shell, and one end of the built-in load beam is arranged in the shell and fixedly connected with the strain gauge type sensor; one end of the ejector pin testing head is arranged outside the shell, the ejector pin testing head and the axis of the built-in load beam are arranged in a collinear mode, and the other end of the built-in load beam is detachably connected with the other end of the ejector pin testing head in the axial direction; the display center is arranged in the shell and is electrically connected with the strain gauge type sensor; when the device is used and the ejector pin testing head is in contact with the ejector pin of the connector, the counter-acting force borne by the ejector pin testing head is indirectly transmitted to the strain gauge type sensor, the testing numerical value is visually displayed through the display center, and the ejector pin testing head can be used for replacing different connectors.

Description

Technical Field

[0001] The present application relates to the technical field of testing and repairing equipment, and in particular to a device for testing the retention force of an electrical connector. Background Art

[0002] With the continuous development of the rail transit industry, electrical connectors are important components for vehicle signal, network, and power transmission. The reliability of connector transmission will directly affect the operation of rail transit vehicles and the comfort and stability of passengers. At present, the normal working state of vehicle connectors is becoming increasingly demanding. For example, they must have requirements such as high temperature resistance, corrosion resistance, waterproofness, anti-static, anti-electromagnetic interference, vibration and shock resistance, and mechanical life of connectors. Ensuring that the connector has no poor contact and no shrinkage is the key to high reliability of connector electrical signal transmission.

[0003] The connector retention test is a mechanical stress test method to evaluate the contact retention state of the connector contact body when the system is under axial force. There are many types of connector retention forces. Here, the terminal and shell retention force (Crimp Terminal Retention Force) is the force of inserting the crimped terminal into the insulation module and then pulling the insulation module vertically with axial force. This retention test mainly tests the force of the terminal barb spring or the insulation module card point. Therefore, the retention force between the terminal and the insulation module cannot be too small, otherwise the pin will shrink easily, resulting in poor transmission contact.

[0004] The retention force test is a necessary detection method, which can effectively prevent connector pins from fatigued service and reduce the failure rate of connectors, thereby improving the conduction performance and reliability. The method of use is: After the connector is assembled, use the retention force test tool to connect the test head to the connector contact body, select the appropriate test head according to the gender and diameter of the contact body, apply force for a certain period of time, and observe that the contact body has no abnormalities, then the retention force passes. Existing retention force test tools often use fixed force to test the retention force between the contact body and the insulator. The test head is not convenient to install, and the test range is not convenient to adjust. When the holding force is applied under harsh conditions, it cannot be operated by individuals alone, and cannot be applied to the testing of multiple types of connection contacts.

[0005] Chinese document CN 208568135 U discloses an electrical connector retention force test device, including a test connector, a test pressure rod, a test rod conversion component, a pressure sensor, a test rod pressure cap, and a display instrument. The test connector is axially connected to one end of the test pressure rod, and the other end of the test pressure rod is axially connected to one end of the pressure sensor through the test rod conversion component. The other end of the pressure sensor is axially connected to the test rod pressure cap, and the pressure sensor is connected to a display instrument through a circuit. A pressure sensor is installed on the test rod, and the sensor signal is connected to the display instrument. The axial thrust is controlled according to the upper limit of the force of the test electrical connector connector, and only the test connector is replaced. This solution can be conveniently carried, but the test results are not prompt, intuitive, and the applied force is unstable, and the results are not intuitive enough.

[0006] Chinese document CN 110763386 A discloses a connector pin ejection force test tool, including a power supply, an indicator, an elastic member and an adapter rod, the adapter rod is a rigid rod, having a first end and a second end, at least the power supply and the indicator form an electrical circuit with a switch on and off, the elastic member acts on the adapter rod, the first end of the adapter rod acts on the connector pin, and after the adapter rod overcomes the preset force value applied by the elastic member, its second end triggers the switch of the electrical circuit to turn on, so that the indicator is turned on and connected to the power supply to send out an indication signal. Although this solution is convenient to carry and can meet general tests, the test force is fixed and cannot be adjusted according to the holding force of various connectors. In addition, the test force is not displayed and is not intuitive. When the working conditions are bad, it cannot be operated by one person. Summary of the invention

[0007] The purpose of the present application is to provide a method to solve the defects of the testing device in the prior art that the test results are not intuitive and the test object is single.

[0008] In order to solve the above technical problems, this application is implemented by adopting the following technical solutions:

[0009] An electrical connector retention force testing device comprising:

[0010] a housing in which a built-in load beam is movably mounted;

[0011] A strain gauge sensor, wherein the strain gauge sensor is fixedly installed in the housing, and one end of the built-in load beam is placed in the housing and fixedly connected to the strain gauge sensor;

[0012] A pin test head with one end disposed outside the housing, the pin test head being arranged colinearly with the axis of the built-in load beam, and the other end of the built-in load beam being axially connected to the other end of the pin test head;

[0013] A display center is disposed in the housing and electrically connected to the variable-chip sensor.

[0014] According to a further solution of the present application, the ejector pin test head is detachably connected to the built-in load beam, one end of the built-in load beam is placed outside the shell and is fixed with a test head locking pressure rod, a ball is installed on the side of the test head locking pressure rod facing away from the shell, and one end of the ejector pin test head is provided with a groove, and the groove is fixed with the ball.

[0015] According to a further solution of the present application, the housing comprises an upper shell and a bottom shell, the upper shell and the bottom shell are interference fit to form a mounting area, and the strain gauge sensor, the display center and the built-in load beam are placed in the mounting area.

[0016] In a further solution, the display center includes an electrically connected display terminal, an integrated circuit and a rechargeable battery, the display terminal, the integrated circuit and the rechargeable battery are fixed in the bottom shell, and the surface of the upper shell is transparent.

[0017] In a further solution, the built-in load beam and the integrated circuit as well as the strain gauge sensor are installed on the lower layer of the bottom shell, and the display terminal and the rechargeable battery are installed on the upper layer of the bottom shell.

[0018] In a further solution, a signal light is fixed on the integrated circuit for providing an alarm prompt for the displayed value of the display terminal.

[0019] In a further solution, a lighting lamp is fixed to a side of the shell close to the ejector test head, and the lighting lamp is electrically connected to the rechargeable battery.

[0020] In a further solution, the ejector pin test head and the elastic part of the contact body adopt a non-contact method.

[0021] The shell is made of transparent material.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] In the present application, an axially connected ejector pin test head and a built-in load beam are designed, and the built-in load beam and the strain gauge sensor are fixedly connected. When the ejector pin test head contacts the ejector pin of the connector, the reaction force received by the ejector pin test head is indirectly transmitted to the strain gauge sensor, and finally the voltage change is realized. The test value is intuitively displayed through the display center, wherein the ejector pin test head is detachable and can be replaced for different connectors, and has strong adaptability. The device is compact in design and can be operated by one person.

[0024] In addition, the ejector test head of the test device is replaceable and removable, and the cooperation of the ball and the groove enables quick installation while ensuring axial and radial limiting and fixation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the internal structure of an embodiment of the present application (without the upper shell);

[0026] Figure 2 This is a schematic diagram of the state when the embodiment of the present application is used;

[0027] in

[0028] 1. Ejector test head; 2. Test head locking rod; 3. Lighting lamp; 4. Built-in load beam; 5. Display terminal; 6. Integrated circuit; 7. Rechargeable battery; 8. Strain gauge sensor; 9. Signal light; 10. Bottom shell. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use.

[0030] Reference Figure 1 The present embodiment discloses an electrical connector retention force testing device, which includes a housing, a strain gauge sensor 8, a pin test head 1 with one end placed outside the housing, and a display center. A built-in load beam 4 is movably installed in the housing; the strain gauge sensor 8 is fixedly installed in the housing, and one end of the built-in load beam 4 is placed in the housing and fixedly connected to the strain gauge sensor 8; the pin test head 1 and the built-in load beam 4 are arranged colinearly with the axis line, and the other end of the built-in load beam 4 is axially detachably connected to the other end of the pin test head 1; the display center is placed in the housing and electrically connected to the strain gauge sensor 8.

[0031] The shell can be designed as a split type, and the shell includes an upper shell and a bottom shell 10. The upper shell and the bottom shell 10 are interference fit to form an installation area. In actual production, a semicircular opening is set at the relative position of the upper shell and the bottom shell 10. The upper shell has flanges extending vertically around the shell, and the upper shell is made of transparent material. The strain gauge sensor 8, the display center and the built-in load beam 4 are placed in the installation area. One end of the built-in load beam 4 is placed in the semicircular opening of the bottom shell 10 and a test head locking rod 2 is fixed. The upper and lower semicircular openings are used to limit the diameter direction of the built-in load beam 4, and are axially movable. A ball is rollingly installed on the side of the test head locking rod 2 away from the bottom shell 10. A groove is opened at one end of the ejector test head 1, and the groove is fixed with the ball to play a radial and axial limit fixation. The plug-in installation of the notch and the fixed shaft can also be adopted here.

[0032] Continue to observe the attached Figure 1In this embodiment, the display center includes a display terminal 5, an integrated circuit 6 and a rechargeable battery 7 connected by wires, wherein the rechargeable battery 7 is detachable, and its specific installation method is a mature existing technology, which will not be repeated here. The display terminal 5, the integrated circuit 6 and the rechargeable battery 7 are fixed in the bottom shell 10. The display terminal 5 can be regarded as a display for displaying the test value of the device. When the upper shell is not made of a light-transmitting material, it is necessary to open an observation port on the surface of the upper shell to observe the test value.

[0033] This embodiment is designed with the consideration of minimizing the volume of the housing. At this time, the built-in load beam 4, the integrated circuit 6, and the strain gauge sensor 8 are installed on the lower layer of the bottom shell 10, and the display terminal 5 and the rechargeable battery 7 are installed on the upper layer of the bottom shell 10. The parts are stacked and placed. The integrated circuit 6 and the strain gauge sensor 8 can be fixed by groove-type clamping or directly using bolts.

[0034] In some other embodiments, a signal light 9 is fixed on the integrated circuit 6 for providing an alarm prompt for the displayed value of the display terminal 5. When the displayed value of the display terminal 5 reaches a predetermined value, the signal light 9 will flash and be accompanied by a buzzer sound. A lighting lamp 3 is fixed to one side of the bottom shell 10 close to the ejector pin test head 1. The lighting lamp 3 is connected to the rechargeable battery 7 with an electric wire for use in a test environment with insufficient light.

[0035] Reference Figure 2 , for specific use, first preset the peak holding force test value or direct test method, apply force to the axial direction of the ejector test head 1 by hand, and the test head locking pressure rod 2 transmits the force to the built-in load beam 4. At this time, the strain gauge sensor 8 is deformed, causing the impedance to change, and then the excitation voltage to change, and output a changing analog signal to feed back the test result to the display terminal 5 through the integrated circuit 6. The display terminal 5 can output a dynamic holding force. When the preset value is reached, the signal light 9 is always on and a buzzer sounds. In addition, the ejector test head 1 can be plugged in and replaced according to the type of connector contact body, and then the appropriate ejector test head 1 can be selected. If the rechargeable battery 7 is low on power, the rear back panel can be removed for charging. When the light in the test environment is weak, the lighting 3 can be turned on to perform normal test operations.

[0036] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 understood as a limitation on the present application. In addition, the terms "first", "second", etc. are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

Claims

1. An electrical connector retention force testing device, characterized in that: include a housing, wherein a built-in load beam (4) is movably mounted in the housing; A strain gauge sensor (8), the strain gauge sensor (8) being fixedly mounted in the housing, and one end of the built-in load beam (4) being placed in the housing and fixedly connected to the strain gauge sensor (8); A pin test head (1) with one end disposed outside the housing, the pin test head (1) being arranged colinearly with the axis of the built-in load beam (4), and the other end of the built-in load beam (4) being axially detachably connected to the other end of the pin test head (1); A display center, the display center being disposed in the housing and electrically connected to the strain gauge sensor (8); One end of the built-in load beam (4) is placed outside the shell and fixed with a test head locking rod (2); a ball is installed on the side of the test head locking rod (2) facing away from the shell; one end of the ejector pin test head (1) is provided with a groove, and the groove is fixed in cooperation with the ball.

2. The electrical connector retention force testing device according to claim 1, characterized in that: The housing comprises an upper shell and a bottom shell (10), wherein the upper shell and the bottom shell (10) are interference-fitted to form a mounting area, and the strain gauge sensor (8) and the display center as well as the built-in load beam (4) are placed in the mounting area.

3. The electrical connector retention force testing device according to claim 2, characterized in that: The display center comprises an electrically connected display terminal (5), an integrated circuit (6) and a rechargeable battery (7); the display terminal (5), the integrated circuit (6) and the rechargeable battery (7) are fixed in the bottom shell (10).

4. The electrical connector retention force testing device according to claim 3, characterized in that: The built-in load beam (4) and the integrated circuit (6) as well as the strain gauge sensor (8) are installed on the lower layer of the bottom shell (10), and the display terminal (5) and the rechargeable battery (7) are installed on the upper layer of the bottom shell (10).

5. The electrical connector retention force testing device according to claim 4, characterized in that: A signal light (9) is fixed on the integrated circuit (6) and is used for providing an alarm prompt for the displayed value of the display terminal (5).

6. The electrical connector retention force testing device according to claim 3, characterized in that: A lighting lamp (3) is fixed to a side of the housing close to the ejector test head (1), and the lighting lamp (3) is electrically connected to the rechargeable battery (7).

7. The electrical connector retention force testing device according to any one of claims 1 to 6, characterized in that: The shell is made of non-metallic material.

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