CN104819839B - Electric connector contact plug characteristic tester and operation method thereof - Google Patents

Abstract

The present invention relates to electric connector contact plug characteristic tester, comprise control module, control module comprises stepper motor driver and controller, controller provides instruction by stepper motor driver to stepper motor, it is characterized in that this tester also comprises mounting base, driver element, test cell and grip unit; Described driver element is arranged on mounting base, and test cell can slide on the line slideway of mounting base, and control module controls driver element action; Described mounting base comprises base plate, filler strip, line slideway, guide rail slide block and riser; Described driver element comprises ball-screw, feed screw nut, travelling platform driving bracket, left leading screw bearing, right leading screw bearing, spring coupling, stepper motor mount pad and stepper motor; Described test cell comprises digital display type contact engaging and separating force meter and travelling platform, and described grip unit comprises A fixture and B fixture.

Description

Electrical connector contact piece plugging characteristic tester and its operating method

technical field

The invention belongs to a device for researching the plug-in and pull-out characteristics of a contact piece of an electromechanical component product (electrical connector), in particular to a tester for the plug-in and pull-out characteristic of an electrical connector contact piece.

Background technique

Electrical connectors are widely used in the fields of aerospace, electric power, electronics, communications, military equipment, transportation, and household appliances, and their connection reliability is directly related to the safe and reliable operation of the entire system. The contact is the core component of the electrical connector, and its excellent structure, stable and reliable contact retention and good electrical conductivity are the guarantee of the contact reliability of the electrical connector. The wear and tear caused by the insertion and extraction process of the connector will continue to accumulate with the increase in the number of mechanical operations of the electrical connector, which will cause changes in important performance indicators such as contact resistance and insertion force, and then affect the contact performance and reliability of the contacts. make an impact. Therefore, it is very necessary and urgent to study the test technology and test equipment for the plug-in and pull-out characteristics of electrical connector contacts.

At present, in the research of universal testing technology and testing devices for plugging and unplugging of electrical connector contacts, it is mainly designed according to different structure types and specific uses, which has certain limitations in terms of versatility: Chinese patent publication with application number 201420544931.3 A device for testing the insertion and extraction force has been developed. The disadvantage is that the device can only obtain one piece of data at a time, and cannot display the change of the insertion and extraction force during the insertion and extraction process, and cannot measure the insertion and extraction force of the electrical connector during the insertion and extraction process. Monitoring of the change process. The Chinese patent application number 201220214578.3 discloses a test device for the insertion and withdrawal force of electrical connector contacts in high temperature environments. The device is used to measure the insertion and withdrawal force of electrical connector contacts in high temperature environments. device, right clamping device, force measuring device, mechanical transmission device, driving device and heating device, but this test device can only test the insertion and withdrawal force of a single-pin contact, it is not suitable for the entire sample, and eccentricity is prone to occur during the experiment Phenomenon, installation and debugging workload is heavy. The invention patent with the announcement number 102262046A discloses a test method and test device for the service life of the connector. The device uses a toothed belt for power transmission, and the aging and wear of the toothed belt will cause the accuracy of the test device to decline; the use of a cam mechanism To realize the transition from rotation to linear reciprocating motion, the control accuracy is not high.

It can be seen that the current electrical connectors and related product plug-in characteristics test devices are mainly developed for plug-in products with specific structures used under special environmental conditions. The applicable test content and purpose are different, and there are large errors in the driving and transmission methods. . Therefore, the test system for plugging and unplugging characteristics of electrical connector contacts can quickly, smoothly, and conveniently install and disassemble test products, improve test efficiency, and reduce labor intensity. The plugging and unplugging characteristic curve of electrical connectors during the plugging process has become one of the key technologies.

Contents of the invention

The purpose of the present invention is to solve the problems of low versatility, heavy test operation workload, and low precision of automatic drive control in the current technology, and to solve the problem of reliable, accurate, continuous and reliable plugging and unplugging process. The key technology to conveniently measure the insertion and withdrawal force of electrical connectors realizes the functions of stable installation and positioning of various types of electrical connectors, stable and accurate driving and testing, and quick acquisition of insertion and extraction characteristic curves, which solves the existing test problems. The problem of complex structure, low precision and cumbersome operation of the device.

Technical scheme of the present invention is:

A tester for plugging and unplugging characteristics of electrical connector contacts includes a control unit, the control unit includes a stepper motor driver and a controller, and the controller provides instructions to the stepper motor through the stepper motor driver, and it is characterized in that the tester also includes An installation base, a drive unit, a test unit and a clamping unit; the drive unit is installed on the installation base, the test unit can slide on the linear guide rail of the installation base, and the control unit controls the action of the drive unit;

The installation base includes a bottom plate, a pad, a linear guide rail, a guide rail slider and a vertical plate; a pad is respectively connected to both sides of the upper surface of the bottom plate along the length direction; a pad is fixedly installed on the upper surface of each pad There is a linear guide rail, and each linear guide rail is equipped with a guide rail slider. The guide rail slider can move left and right on the corresponding linear guide rail. The length and width of the linear guide rail are the same as the length and width of the pad. The lower end of the plate is fixedly connected with the bottom plate and the left ends of the two pads, a large through hole is opened in the center of the vertical plate, and several smaller threaded through holes are evenly opened on the periphery of the large through hole on the vertical plate;

The drive unit includes a ball screw, a screw nut, a traveling platform drive bracket, a left screw support, a right screw support, an elastic coupling, a stepping motor mount and a stepping motor; the ball A screw nut is installed on the screw, and the screw nut is fixed together with the driving bracket of the traveling platform, and the ball screw is fixed on the bottom plate through the left screw support and the right screw support; the elastic coupling One end of the device is connected to one end of the ball screw, and the other end is connected to the motor shaft of the stepping motor; thus, the ball screw, the stepping motor and the elastic coupling are fixed together, so that the stepping motor and the ball screw pass through The elastic coupling is coaxially connected; the left end face of the stepping motor is installed on the stepping motor mounting base, the stepping motor is connected with the control unit, and the bottom of the stepping motor mounting base is fixed on the base plate;

The test unit includes a digital display plug-in force meter and a swimming platform, the back of the digital display plug-in force meter is fixedly connected to the middle part of the swimming platform, and the left end of the digital display plug-in force meter is connected to the swimming platform. The left end of the platform is flush, and there are through holes on the plane of the swimming platform and on the front and rear sides of the digital display plug-in force gauge and on the right side of the digital display plug-in force gauge. The through holes located on the front and rear sides of the digital display force gauge are connected to the upper surface of the guide rail slider, and the through holes on the plane of the swimming platform and on the right side of the digital display force gauge are connected to the driving platform of the travel platform. The upper surface of the bracket is connected;

The clamping unit includes a clamp A and a clamp B, the clamp A is used to clamp the pin part of the electrical connector, and the clamp B is used to clamp the socket part of the electrical connector; the clamp A is a hollow cylindrical boss structure, The outer diameter of the left end of the A fixture matches the larger through hole of the vertical plate, and is fixed on the vertical plate by screws, and the inner cavity of the hollow cylindrical boss structure is fixed to accommodate the pin part of the electrical connector; the B clamp is a double The side threaded sleeve structure consists of two hollow cylindrical parts with different inner diameters, and each cylindrical part is provided with internal threads. The inner diameter of the cylindrical part with the smaller inner diameter matches the outer diameter of the test probe of the digital display force gauge; the right end of the B fixture is screwed onto the test probe of the digital display force gauge and fixed , A fixture and B fixture are installed on the center.

In the plugging characteristic tester for electrical connector contacts, the fixture A includes a circular ring part and a small cylindrical part. There are several through holes, the through holes on the end face of the ring part match the smaller threaded through holes on the outer circumference of the larger through hole on the vertical plate, and the outer diameter of the left end of the circular ring part matches the larger through hole on the vertical plate ; Three threaded holes are evenly opened on the side circumference of the small cylindrical part of the A fixture, and a hexagon socket head screw is screwed in the threaded hole, and the electrical connector is clamped and fixed by the hexagon socket head screw.

The above-mentioned tester for plugging and unplugging characteristics of electrical connector contacts, the stepper motor mounting seat is an "L"-shaped bent iron plate, including a bottom plate part, a vertical plate part and a reinforcing baffle, the right end of the bottom plate part and the lower end of the vertical plate part fixed, and strengthened and fixed by a reinforced baffle, the reinforced baffle is a triangular reinforced baffle, the bottom plate part of the stepping motor mounting base is fixedly connected with the bottom plate; the vertical plate part of the stepping motor mounting base is fixedly equipped with a stepping motor .

In the plugging and unplugging characteristic tester for electrical connector contacts, the bottom plate is a rectangular thick cast iron metal plate, and the thickness of the bottom plate, the vertical plate, and the swimming platform are all equal.

The specific operation method of the above-mentioned electric connector contact plug-in and pull-out characteristic tester is as follows:

The first step is to install the electrical connector of the tested product:

The control unit controls the stepping motor to reverse, and the swimming platform moves to the right, so that after a distance greater than the length of the electrical connector of the tested product is left between the A fixture and the B fixture, the stepping motor stops; the tested product's electrical connector Insert and fit according to the normal use state, after removing the outer metal armor, screw the jack part of the electrical connector into the opening of the hollow cylinder part at the left end of the B fixture, and lock it with the set screw at the concave end; the stepping motor rotates forward , the swimming platform slowly moves to the left until the outer edge of the pin part of the electrical connector of the tested product touches the outer edge of the right end of the A fixture, and the pin part of the electrical connector of the tested product is embedded in the hollow cylindrical boss structure of the A fixture In the inner cavity, and clamp and fix it, to ensure that the electrical connector of the tested product is installed in the center;

The second step is to conduct the plug-in and pull-out characteristic test of the electrical connector of the tested product:

After starting to run, the control unit controls the stepping motor to rotate forward, drives the ball screw to rotate, and then drives the test unit to move to the left, so that the pins of the electrical connector of the tested product are inserted into the jack, and the tested product is inserted. When it is fully mated, the stepping motor stops and waits for 2-5 seconds; then the stepping motor reverses, driving the test unit to move to the right, and the electrical connector of the tested product is pulled out, so that the tested product's electrical connector The pin is separated from the jack, and the stepper motor stops after returning to the initial position and waits for 2-5 seconds. During this process, the digital display plug-in force meter records and stores the test data in the PC through the data line. ; After the specified number of cycles in this way, the test piece returns to the initial position, and the stepping motor stops running;

The third step is to draw the plug-in and pull-out characteristic curve of the electrical connector of the tested product according to the test data:

Continuously monitor the change of the insertion force with the insertion time during the insertion and extraction process through the digital display insertion force meter, and record and store it, and use the data stored in the PC to draw the insertion and extraction characteristic curve of the electrical connector of the tested product .

In the above-mentioned tester for plugging and unplugging characteristics of electrical connector contacts, the speed of plugging and unplugging the pins and jacks of the electrical connector of the tested product in the operation method is not more than 300 times per hour.

The remarkable progress of the present invention is that, compared with the existing plug-in force test device mainly based on simple factory test and plug-in life test, the electric connector contact plug-in/unplug characteristic tester of the present invention combines digital display The data test of the force meter can not only perform the plug-in life test, but also output the plug-in characteristic curve for a single plug-in test; in the present invention, the drive unit is a stepper motor connected with a ball screw through a Shaft transmission, abandoning the power transmission through belts, toothed belts or cams, hinges, etc. in the existing design, avoiding the problem of test accuracy degradation caused by aging and wear of belts, toothed belts, cams, hinges and other components Secondly, the fixture in the present invention can adjust the aperture size of the A fixture or replace the B fixture according to the requirements, so as to take into account the plug-in and pull-out tests of various types of electrical connectors with similar structures, and has strong versatility. A fixture adopts a three-jaw chuck design, which enables fast and accurate centering installation of electrical connector pins and sockets. Both the A fixture and the B fixture are detachable parts. When testing the insertion and withdrawal force characteristics of other types of electrical connectors, the corresponding matching fixtures can be easily replaced, which can meet the needs of different electrical connectors.

Compared with prior art, the beneficial effect of the present invention is:

1. The fixture in the present invention can adjust the aperture size of fixture A or replace fixture B according to requirements, so as to take into account the plug-in and pull-out tests of various types of electrical connectors with similar structures, and has strong versatility.

2. According to the special requirements of the electric connector plug-in force test, in the installation base, the distance from the center of the larger through hole on the vertical plate to the bottom plate should always ensure the distance from the test probe of the digital display plug-in force meter. The distance between the axis center and the bottom plate is equal, and the bottom plate, vertical plate and swimming platform of the same thickness are preferred, and the parallelism of the upper and lower surfaces of the bottom plate, pads, and swimming platform reaches 0.02mm, and the surface roughness of the upper and lower surfaces is not greater than RA0. 8. Ensure the centering installation of the fixture, thereby ensuring the stability of the entire tester during the test, reducing the error of the test data and improving the test accuracy.

3. In the present invention, the digital display plug-in force gauge is fixed on the swimming platform to form a test unit, and then cooperates with the function of the drive unit to achieve high-precision testing, which solves the problem of plug-in force characteristics of electrical connectors. The difficulty of reading and storing curve data simplifies the tester, making the test operation easier and more efficient.

4. The bottom plate of the present invention adopts a rectangular thick cast iron plate. Compared with the steel plates commonly used in the prior art, it is cost-effective, has better shock absorption, and is not easily deformed, effectively reducing the small size of the tester during the test. Deformation provides a guarantee for improving the measurement accuracy, thereby ensuring the stable operation of the tester.

5. The clamping unit designed by the present invention includes A clamp and B clamp. These two parts are independent of each other. The B clamp is used as the fixed reference installation position, and the "pin" part of the electrical connector can be flexibly adjusted by using the three screws in the A clamp. The location can not only solve the problem of the centering installation of the two parts of the pin socket of the electrical connector, but also reduce the difficulty and cumbersomeness of the installation and adjustment of the electrical connector test product.

6. The driving unit of the present invention adopts the coaxial drive of the stepping motor, uses the positive and negative movement of the stepping motor to drive the ball screw to rotate, drives the traveling platform to move through the driving bracket of the traveling platform, and then drives the digital display insertion force The reciprocating movement of the meter realizes the continuous operation and single-step debugging operation of electrical connector plugging (that is, the insertion and extraction of pins and sockets).

Description of drawings

Fig. 1 is a schematic isometric structural view of an embodiment of an electrical connector contactor plugging characteristic tester of the present invention;

Fig. 2 is a schematic diagram of the front view of the mounting base 1 of an embodiment of the tester for plugging and unplugging characteristics of electrical connector contacts of the present invention;

FIG. 3 is a schematic top view of the installation base 1 of an embodiment of the tester for plugging and unplugging characteristics of electrical connector contacts of the present invention;

Fig. 4 is a left view structural diagram of the installation base 1 of an embodiment of the electrical connector contact plugging characteristic tester of the present invention;

Fig. 5 is a schematic diagram of the front view of the drive unit 2 of an embodiment of the tester for plugging and unplugging characteristics of electrical connector contacts of the present invention;

FIG. 6 is a schematic top view of the drive unit 2 of an embodiment of the tester for plugging and unplugging characteristics of electrical connector contacts of the present invention;

Fig. 7 is a left view structural diagram of the drive unit 2 of an embodiment of the tester for plugging and unplugging characteristics of electrical connector contacts of the present invention;

Fig. 8 is a front structural schematic diagram of the test unit 3 of an embodiment of the electrical connector contact plugging characteristic tester of the present invention;

FIG. 9 is a schematic top view of the test unit 3 of an embodiment of the tester for plugging and unplugging characteristics of electrical connector contacts of the present invention;

Fig. 10 is a schematic diagram of the left view of the test unit 3 of an embodiment of the tester for plugging and unplugging characteristics of electrical connector contacts of the present invention;

Fig. 11 is a three-view view of the traveling platform driving bracket 23 of an embodiment of the electric connector contact plugging characteristic tester of the present invention; wherein Fig. 11 (a) is a front structural schematic diagram of the traveling platform driving bracket 23 ; Fig. 11 (b) is a schematic top view structure diagram of the traveling platform driving bracket 23; Fig. 11 (c) is a left view structural diagram of the traveling platform driving bracket 23;

Fig. 12 is a front view and a cross-sectional view of the left lead screw support 24 of an embodiment of the electric connector contact plugging characteristic tester of the present invention; wherein Fig. 12 (a) is a front structural schematic view of the left lead screw support 24 ; Figure 12 (b) is a schematic cross-sectional structure diagram of the A-A plane in Figure 12 (a);

Fig. 13 is the three views of the stepping motor mounting base 27 of an embodiment of the electric connector contact plugging characteristic tester of the present invention; Wherein Fig. 13 (a) is the front view structure diagram of the stepping motor mounting base 27; Fig. 13 (b) is a top view structural representation of the stepping motor mounting base 27; FIG. 13 (c) is a left view structural representation of the stepping motor mounting base 27;

Fig. 14 is the front view and the left side view of the swimming platform 32 of an embodiment of the electric connector contact piece plugging characteristic tester of the present invention; Wherein Fig. 14 (a) is the front view structure diagram of the swimming platform 32; Wherein Fig. 14(b) is a left view structural schematic diagram of the swimming platform 32;

Fig. 15 is a front view and a cross-sectional view of the A fixture 41 of an embodiment of the electric connector contact plugging characteristic tester of the present invention; wherein Fig. 15 (a) is a front structural schematic view of the A fixture 41; Fig. 15 (b) It is a schematic diagram of the cross-sectional structure of the B-B plane of Fig. 15(a);

Fig. 16 is a front view and a cross-sectional view of the B fixture 42 of an embodiment of the electric connector contact plugging characteristic tester of the present invention; wherein Fig. 16 (a) is a front structural schematic view of the B fixture 42; Fig. 16 (b) It is a schematic cross-sectional structure diagram of the C-C plane of Fig. 16(a);

Fig. 17 is a test control flow chart of an embodiment of the electric connector contact plugging characteristic tester of the present invention;

Fig. 18 is a graph showing the change of insertion force with time during the first insertion and extraction process of the electrical connector of embodiment 1;

Fig. 19 is a graph showing the change of plugging force with time during the first plugging, 300th plugging, 500th plugging and 800th plugging of the electrical connector of Embodiment 1;

Fig. 20 is a graph of the maximum insertion force and the maximum separation force during the first to 800th plugging and unplugging process of the electrical connector of Embodiment 1;

In the figure, 1-installation base, 2-drive unit, 3-test unit, 4-clamping unit, 11-bottom plate, 12-pad strip, 13-linear guide rail, 14-rail slider, 15-vertical plate, 21-ball screw, 22-screw nut, 23-moving platform drive bracket, 24-left screw support, 25-right screw support, 26-elastic coupling, 27-stepping motor installation Seat, 28-stepper motor (or motor), 31-digital plug force gauge, 32-moving platform, 41-A fixture, 42-B fixture.

detailed description

The tester for plugging and unplugging characteristics of electrical connector contacts of the present invention (referred to as the tester, see Figure 1-16) includes an installation base 1, a drive unit 2, a test unit 3, a control unit (not shown in the figure) and a clamping unit 4; the drive unit 2 is installed on the installation base 1, the test unit 3 can slide on the linear guide rail 13 of the installation base 1, the control unit includes a stepper motor driver and a controller, and the controller passes the stepper motor driver to the The stepper motor provides instructions to control the action of the drive unit;

The installation base 1 includes a base plate 11, a pad 12, a linear guide rail 13, a guide rail slider 14 and a vertical plate 15; the upper surface of the base plate 11 is respectively connected with a pad 12 along both sides of the length direction; A linear guide rail 13 is fixedly installed on the upper surface of each spacer 12, and a guide rail slider 14 is installed on each linear guide rail 13, and the guide rail slider 14 can move left and right on the corresponding linear guide rail 13, and the linear guide rail 13 Length and width are identical with the length and the width of pad strip 12, and the lower end of described vertical plate 15 is fixedly connected with the left end of base plate 11 and two pad strips 12, and the center of vertical plate 15 has a bigger through hole, and the vertical plate 15 Several smaller threaded through holes are evenly opened on the outer circumference of the larger through hole;

The drive unit 2 includes a ball screw 21, a screw nut 22, a traveling platform driving bracket 23, a left screw support 24, a right screw support 25, an elastic coupling 26, and a stepping motor mounting seat 27 and a stepper motor 28; the ball screw 21 is equipped with a screw nut 22, the screw nut 22 and the traveling platform driving bracket 23 are fixed together, and the ball screw 21 passes through the left screw support 24 and the right The screw support 25 is fixed on the base plate 11; one end of the elastic coupling 26 is connected to one end of the ball screw 21, and the other end is connected to the motor shaft of the stepping motor 28; thus, the ball screw 21, step The stepping motor 28 and the elastic coupling 26 are fixed together, so that the stepping motor 28 and the ball screw 21 are coaxially connected through the elastic coupling 26; the left end of the stepping motor 28 is installed on the stepping motor mount 27 On, the stepping motor 28 is connected with the control unit, and the bottom of the stepping motor mount 27 is fixed on the base plate 11;

The test unit 3 includes a digital display force gauge 31 and a swimming platform 32, the back of the digital display force gauge 31 is fixedly connected to the middle part of the swimming platform 32, and the digital display force gauge The left end of 31 is flush with the left end of the swimming platform 32, on the plane of the swimming platform 32 and located on the front and back sides of the digital display type insertion force meter 31 and the right side of the digital display type insertion force meter 31 are provided with Through holes, on the plane of the traveling platform 32 and on the front and rear sides of the digital display plug force gauge 31, the through holes are connected to the upper surface of the guide rail slider 14, on the plane of the traveling platform 32 and located on the front and rear sides of the digital display plug-in force gauge 31. The through hole on the right side of the force gauge 31 is connected to the upper surface of the driving bracket 23 of the traveling platform;

The clamping unit 4 includes an A clamp 41 and a B clamp 42, the A clamp 41 is used for clamping the pin part of the electrical connector, and the B clamp 42 is used for clamping the socket part of the electrical connector; the A clamp 41 is hollow Cylindrical boss structure, the outer diameter of the left end of the A fixture 41 matches the larger through hole of the vertical plate 15, and is fixed on the vertical plate 15 by screws, and the inner cavity of the hollow cylindrical boss structure is fixed to accommodate the electrical connector socket. Needle part; the B fixture 42 is a double-sided threaded sleeve structure, including two hollow cylinder parts with unequal inner diameters, and each cylinder part is provided with internal threads, and the inner diameter of the cylinder part with larger inner diameter Match the outer diameter of the jack part of the electrical connector under test, and the inner diameter of the cylinder part with a smaller inner diameter matches the outer diameter of the test probe of the digital display insertion force meter 31; the right end of the B fixture 42 is screwed to the digital display On the test probe of type plug-in force gauge 31, and fixed, A fixture 41 and B fixture 42 carry out centering installation.

Example 1

Fig. 1 is a schematic diagram of an isometric structure of an electric connector contact plugging characteristic tester. The electrical connector contact plugging characteristic tester mainly includes an installation base 1, a drive unit 2, a test unit 3, a control unit and a clamping Unit 4, drive unit 2 is installed on the installation base 1, the test unit 3 can slide on the linear guide rail 13 of the installation base 1, the clamping unit 4 includes A fixture 41 and B fixture 42, A fixture 41 is fixed on the installation base On the vertical plate 15 at the left end of the seat 1 , the B fixture 42 is fixed on the test probe of the test unit 3 , and the control unit controls the action of the drive unit 2 .

The structure of the installation base 1 is shown in Figure 2-4. The installation base 1 includes a base plate 11, a pad 12, a linear guide rail 13, a guide rail slider 14 and a vertical plate 15; the base plate 11 is a rectangular cast iron metal plate, and the base plate 11 is along the The edges in the length direction are equidistantly provided with seven counterbores from bottom to top, and the left end surface and the bottom surface of the bottom plate 11 are provided with threaded holes; There are threaded through holes in the vertical direction, and the threaded through holes of the pad 12 are matched with the counterbores on the base plate 11, and the hexagon socket screws are screwed into the threaded through holes of the pad 12 from bottom to top by the counterbores of the base plate 11, and the two The pad strips 12 are respectively vertically fixed on the upper surface of the base plate 11, and the left end surface of the pad strips 12 is also provided with threaded holes. Described linear guide rail 13 is strip metal guide rail, also has front and rear two, the shape of the cross section of linear guide rail 13 is I-shaped, and the length and width of linear guide rail 13 are identical with the length and the width of pad strip 12, and in the There is a counterbore at the matching position of the threaded through hole of the strip 12, and the hexagon socket head screw is screwed into the threaded through hole of the pad 12 from top to bottom through the counterbore of the linear guide rail 13, and the linear guide rail 13 is fixed on the pad 12; the upper end surface of the guide rail slider 14 is a square boss structure, and the lower part is a hollow structure matched with the linear guide rail 13, so as to ensure that the guide rail slider 14 and the linear guide rail 13 are snapped together, and the guide rail slider 14 can be in the corresponding The linear guide rail 13 moves left and right; the four corners of the upper surface of the boss structure of the guide rail slider 14 are all provided with threaded holes; the vertical plate 15 (referring to Fig. There is a larger through hole, and four smaller threaded through holes are evenly opened on the periphery of the larger through hole on the vertical plate 15; on the vertical plate 15 and on both sides of the lower part of the larger through hole, there are three transverse through holes, From top to bottom, the upper two horizontal through holes fix the vertical plate 15 and the threaded hole on the left end surface of the pad 12 through the hexagon socket head cap screws; The height of the three transverse through holes matches the height of the threaded holes on the left end surface of the pad 12 and the height of the threaded holes on the bottom plate 11, and ensures that the bottom surface of the vertical plate 15 is level with the bottom surface of the bottom plate 11 after installation Qi, thereby vertical plate 15 and base plate 11 and pad strip 12 are fixed together.

The structure of the drive unit 2 is shown in Figure 5-7. The drive unit 2 includes a ball screw 21, a screw nut 22, a traveling platform drive bracket 23, a left screw support 24, a right screw support 25, an elastic Coupling 26, stepper motor mount 27 and stepper motor 28; Ball screw 21 side has keyway, one side does not have keyway. The diameter of the axial threaded hole in the middle of the screw nut 22 is equivalent to the outer diameter of the ball screw 21, and the ball screw 21 is screwed into the screw nut 22 through the threaded hole; the driving bracket 23 of the traveling platform (as shown in Figure 11) is Cuboid metal block, with two vertical threaded holes on both sides of the upper end surface, a large through hole in the middle of the side, and two axial threaded holes in the axial direction on both sides of the large through hole; the driving bracket of the swimming platform 23 is sleeved on the wire On the bar nut 22, the hexagon socket head screw is screwed into the two axial threaded holes of the traveling platform driving bracket 23 through the leading screw nut 22, thereby the leading screw nut 22 and the traveling platform driving bracket 23 are fixed together;

Left screw support 24 (as shown in Figure 12) is " convex " shape bearing seat, and two pieces of 6001 bearings are housed inside, and bearing outside is provided with bearing cover, compresses bearing by bearing cover, prevents it from protruding. The lower part of the left screw support 24 is fixed on the corresponding position of the base plate 11; the shape and structure of the right screw support 25 are consistent with the shape and structure of the left screw support 24, and match with the other end of the ball screw 21 , and the lower end is fixed on the corresponding position of the bottom plate 11. Both sides of the ball screw 21 are respectively inserted into the bearings of the left screw support 24 and the right screw support 25 and are tightly engaged with the ball screw 21 through the bearings therein. One end of the elastic coupling 26 is connected to the end of the ball screw 21 with a keyway and fixed by screws, and the other end of the elastic coupling 26 is connected to the motor shaft of the stepper motor 28 and fixed by screws; thus, The ball screw 21 , the stepping motor 28 and the elastic coupling 26 are fixed together, so that the stepping motor 28 and the ball screw 21 are coaxially connected through the elastic coupling 26 . The stepper motor mount 27 (as shown in Figure 13) is an "L"-shaped bent iron plate, including a base plate part, a vertical plate part and a reinforced baffle, the right end of the base plate part is fixed with the lower end of the vertical plate part, and passes The reinforced baffle is strengthened and fixed, and the reinforced baffle is a triangular reinforced baffle, and four countersunk holes are arranged on the four corners of the bottom plate 11 of the stepping motor mounting seat 27, and the stepping motor mounting seat 27 is fixed by a hexagon socket head cap screw. The bottom plate part is fixedly connected with the bottom plate 11; a through hole is arranged in the middle of the vertical plate 15 part of the stepping motor mount 27, and the motor shaft of the stepping motor 28 passes through the through hole of the "L" type bent iron plate vertical plate part and The elastic coupling 26 is connected, and the four top corners of the vertical plate part of the "L" type bent iron plate are provided with four threaded holes, and the stepping motor 28 is fixed on the stepping motor mounting base 27 through the hexagon socket head screw. on the vertical panel part. The distance from the bearing center of the left screw support 24 and the right screw support 25 to the base plate 11 is equal to the distance from the center of the motor shaft of the stepping motor 28 to the base plate 11. The stepper motor 28 is controlled by the control unit to perform forward, reverse or stop actions.

The structure of the test unit 3 is shown in Figures 8-10. The test unit 3 includes a digital display force gauge 31 and a swimming platform 32. Buttons and a display screen are provided on the front of the digital display force gauge 31. There are four threaded holes at the top of the back, a cylindrical metal rod is arranged in the middle of the left end of the digital display dynamometer 31, which is a test probe of the digital dynamometer 31, and the left end of the metal rod is threaded. The traveling platform 32 (shown in FIG. 14 ) is a rectangular metal plate, the back of the digital display plugging force gauge 31 is fixedly connected with the middle part of the traveling platform 32 by hexagon socket head cap screws, and the digital display plugging force gauge The left end face of 31 is flush with the left end face of the swimming platform 32, on the plane of the swimming platform 32 and at the front and back sides of the digital display type plug-in force meter 31 and the right side of the digital display type plug-in force meter 31. There are through holes, on the plane of the traveling platform 32 and on the front and rear sides of the digital display force gauge 31, the through holes are matched with the threaded holes of the slide block 14 of the guide rail. The through holes located on the front and rear sides of the digital display type plug-in force gauge 31 are connected with the threaded holes of the guide rail sliders 14, so that the traveling platform 32 is fixed on the two guide rail sliders 14, and the traveling platform 32 The through hole on the plane and on the right side of the digital display type plug-in force gauge 31 is connected with the two vertical threaded holes of the driving bracket 23 of the traveling platform by hexagon socket screws, and the traveling platform 32 is fixed on the traveling platform. Drive bracket 23.

The structure of the clamping unit 4 is shown in FIGS. 15-16 , and the clamping unit 4 includes an A clamp 41 and a B clamp 42 . The A clamp 41 is used to clamp the pin part of the electrical connector, and the B clamp 42 is used to clamp the socket part of the electrical connector. A jig 41 (as shown in Figure 15) is a hollow cylindrical boss structure as a whole, similar to the design of a three-jaw chuck, including a ring part and a small cylinder part. The ring part and the small cylinder part are coaxial and integrated parts. The inner cavity of the cylindrical boss structure is used to accommodate the pin part of the electrical connector, and four through holes are evenly opened along the circumferential direction on the end face of the ring part, and the through holes on the end face of the ring part are connected with the holes on the vertical plate 15. The smaller threaded through hole on the outer circumference of the larger through hole matches, and the through hole on the end face of the ring part of the A fixture 41 is matched with the smaller threaded through hole on the outer circumference of the larger through hole on the vertical plate 15 by a hexagon socket head cap screw. Connected, so that the A fixture 41 is fixed on the vertical plate 15; three threaded holes are uniformly opened on the side circumference of the small cylindrical part of the A fixture 41, and a hexagon socket head screw is screwed in the threaded holes, thereby realizing the clamping of the electrical connector fixed. B fixture 42 (as shown in Figure 16) is a double-sided threaded sleeve structure, including two hollow cylindrical parts with different inner diameters, each side has a set screw with a concave end, and the cylindrical part with a larger inner diameter The inner diameter matches the outer diameter of the jack part of the electrical connector under test, and the inner wall of the end with a larger inner diameter is covered with a non-standard fine-pitch thread. The electrical connector is screwed into the B fixture 42 and locked by the set screw at the concave end; The inner diameter of the cylinder portion with a smaller inner diameter matches the outer diameter of the test probe of the digital display plug-in force gauge 31, and the inner wall of the end with a smaller inner diameter is also covered with threads, and the B fixture 42 is screwed through the end with a smaller inner diameter. Connect to the test probe of the digital display plug-in force meter 31, and lock it with the set screw at the concave end, and fix the B fixture 42 on the test probe of the digital display plug-in force meter 31. The center distance between the center of the larger through hole of the vertical plate 15 and the center of the bottom plate 11 is equal to the center distance between the center of the test probe of the digital display type plug-in force gauge 31 and the center of the bottom plate 11, ensuring that the A fixture 41 and the B fixture 42 are installed on the center.

The operating method of the electric connector contact piece plugging characteristic tester of the present invention is: when carrying out the electric connector contact piece plugging characteristic test, assemble the tester according to the above-mentioned connection mode, set the stepper motor step angle by the control unit as 1.8°, holding torque 1.35N m, the specific operation method is:

The first step is to install the electrical connector of the tested product:

The control unit controls the stepping motor 28 to reverse, and the traveling platform 32 moves to the right. After leaving a distance greater than the length of the electrical connector of the tested product between the A fixture 41 and the B fixture 42, the stepping motor 28 stops. The electrical connector of the tested product is mated according to the normal use state. After removing the external metal armor, screw the electrical connector jack part into the opening of the hollow cylinder part at the left end of the B fixture 42, and tighten the screw lock through the concave end. tight. The stepper motor 28 rotates forward, and the traveling platform 32 slowly moves to the left until the outer edge of the pin part of the electrical connector of the tested product touches the outer edge of the small cylindrical part of the A fixture 41 (the right end of the A fixture 41), and the tested The pin part of the product electrical connector is embedded in the inner cavity of the hollow cylindrical boss structure of the A fixture 41, and the electric connector is connected to the electric connector through three fastening screws corresponding to the threaded holes on the side circumference of the small cylindrical part of the adjustment A fixture 41. The pin part of the connector is fastened in the A fixture 41, and it is ensured that the electrical connector of the tested product is mounted on the center.

The second step is to conduct the plug-in and pull-out characteristic test of the electrical connector of the tested product:

After starting to run, the stepper motor 28 rotates forward, drives the ball screw 21 to rotate, and then drives the test unit 3 to move to the left, so that the pins of the electrical connector of the tested product are mated with the jack, and the tested product is inserted. When fully mated, the motor stops and waits for 2 seconds; then the stepper motor 28 reverses to drive the test unit 3 to move to the right, and the pull-out operation of the electrical connector of the tested product is performed, so that the plug-in of the tested product's electrical connector The needle is separated from the jack, and the stepper motor 28 stops rotating after returning to the initial position and waits for 2 seconds. During this process, the digital display plug force meter 31 records and stores the test data in the PC through the data line. After the specified number of cycles in this way, the test piece returns to the initial position, and the motor stops running.

The third step is to draw the plug-in and pull-out characteristic curve of the electrical connector of the tested product according to the test data:

Continuously monitor the change of the insertion force with the insertion time during the insertion and extraction process through the digital display insertion force meter 31, and record and store it, and use the data stored in the PC to draw the insertion and extraction characteristics of the electrical connector of the tested product curve.

The control flow of the control unit (as shown in Figure 17 ) of the control unit of the electrical connector contact piece plugging characteristic tester of the present invention is: start→counter reset→set motor speed→motor forward 1200 steps→motor pause 2s→motor reverse Turn 1200 steps → The motor stops for 2s → Is the predetermined number of cycles completed? Finish; Return the motor to rotate 1200 steps forward.

Table 1 shows the test data of the insertion and withdrawal force over time during the insertion and extraction process of the 25M-3AE circular three-core electrical connector. The first insertion and extraction of the 25M-3AE circular three-core electrical 300 insertions, 500th insertion and 800th insertion force change data with time. FIG. 18 and FIG. 19 are characteristic curves of insertion and extraction force of the electrical connector as a function of time drawn according to the data measured in Table 1.

In Figure 18 and Figure 19, the abscissa represents time, and the ordinate represents the insertion force value. The data collected by the digital display insertion force meter shows a negative value for the insertion force, and a positive value for the separation force. The time when the hole first contacts and generates the insertion force value is recorded as 0 time. During the operation, the insertion force test data is continuously recorded according to the set time interval (0.08s), and uploaded to the computer for data processing. .

Table 125M-3AE Circular three-core electrical connector plug-in and pull-out force changes with time at different plug-in times (unit: N)

Table 2 shows the test data of the maximum insertion force and maximum separation force of the overall electrical connector when the 25M-3AE circular three-core electrical connector is subjected to a plugging wear test. Fig. 20 is a graph of the maximum insertion force and maximum separation force of the 25M-3AE circular three-core electrical connector during the first to the 800th insertion and extraction process.

The above test results shown in Figures 18-20 are universal and applicable to electrical connectors that can be detected by the tester of the present invention, especially for plugging and unplugging tests of circular electrical connectors. No more than 300 times per hour, which is equivalent to one plugging and unplugging every 12s. Therefore, the present invention can output the plugging characteristic curve for a single plugging test, complete the plugging force test, and can read and store the data of the plugging force characteristic curve of the electrical connector.

Table 225M-3AE circular three-core electrical connector maximum insertion force and maximum separation force experimental data (unit: N)

The installation base 1, drive unit 2, and test unit 3 of the present invention are designed to meet the working characteristics of the electrical connector and the test requirements for plugging and unplugging characteristics. measurement error. Among them, the installation base 1 is composed of a bottom plate 11, pad strips 12, linear guide rails 13, guide rail sliders 14, and vertical plates 15. These parts are tightly fixed together. The requirements for equipment rigidity and strength ensure the stable installation of the tester as a whole; the thickness of the vertical plate 15 is equivalent to that of the bottom plate 11, and the large thickness ensures the rigidity of the material and reduces the deformation of the vertical plate 15 during the plugging process, and through the screws at the corresponding positions and the The bottom plate 11 and the spacer 12 are fixedly connected. The upper and lower ends of each spacer 12 are processed with high precision, the parallelism must reach 0.02 mm, the surface roughness of the upper and lower surfaces must reach RA0.8, and the height of the two spacers 12 is the same, ensuring solid The linear guide rail 13 installed on it is parallel to the bottom plate 11, so as to ensure that the test unit 3 installed on it can slide parallel on the guide rail without tilting up and down; when designing the height of the test unit 3, ensure that the A fixture 41 and the B The center of the fixture 42 is aligned up and down, and aligned left and right. In particular, by adjusting the three screws on the protruding part of the A fixture 41, it can flexibly adapt to the slight difference in the clamping position of the electrical connector socket component clamped by the B fixture, and finally complete the centering installation.

The driving unit 2 of the present invention is installed coaxially with the ball screw 21 by the stepping motor 28 through the elastic coupling 26, wherein the stepping motor 28 is fixed on the base plate 11 through the stepping motor mounting seat 27, and the ball screw 21 passes The left screw support 24 and the right screw support 25 are fixed on the base plate 11 to form a transmission mechanism with simple structure and high precision.

The digital display plug-in force meter 31 in the present invention adopts a horizontal installation method, which improves the convenience of installation, adjustment and disassembly of the digital display plug-in force meter 31, and at the same time ensures the installation of the electrical connector of the tested product. , During the adjustment and disassembly process, the slight difference in the installation position will not affect the accuracy of the test, which reduces labor intensity and tediousness, and improves work efficiency. The digital display insertion force meter 31 can directly read the experimental data and directly output and store the data, which well solves the problem of low test accuracy of the electrical connector and difficulty in reading the insertion force during the existing insertion force characteristic test. ; At the same time, the method reduces the complexity of the tester, making the test operation easier and more efficient.

The inner diameter of the through hole of the A fixture 41 of the present invention is larger than the diameter of the circular electrical connector, and circular electrical connectors of different sizes can all extend into it. When the two screws are fixed, there is no need to frequently replace the A fixture 41 due to the different diameters of the clamped objects. The universal type is strong, and the adjustment work is simple and fast. In addition, both the A fixture 41 and the B fixture 42 are detachable parts. When testing the plugging force characteristics of other types of electrical connectors, the corresponding supporting fixture set can be replaced, and the disassembly and assembly are convenient.

The screws used in the present invention are all hexagon socket screws, which are convenient for fastening and disassembly, and are not easy to slip. The operation is carried out in the space, so that the overall installation of the device and the installation and fixing process of the electrical connector DUT are labor-saving, convenient and efficient. However, the hexagon socket head cap screws in the present invention can also be fixed by other common technical means in the field, on the premise of ensuring the tight fixation of the tester as a whole.

The orientation words such as " front ", " back ", " left ", " right ", " upper ", " lower " involved in the present invention are based on the isometric structure diagram of Fig. 1, and are a relative concept , that is, the direction of the vertical board 15 is left, and the direction of the stepping motor 28 is right.

Example 2

In this embodiment, the connection and positional relationship described in Embodiment 1 is adopted, the ball screw 21 is selected from the TBI1605 single nut ball screw pair (standard part), and the linear guide 13 is selected from the HCR20 type linear guide (standard part); Block 14 is a high-assembly square slider; the control unit includes a stepper motor driver and a controller, and the controller provides instructions to the stepper motor through the stepper motor driver. The present embodiment selects 57 stepper motors of 76mm to provide power, and the step distance The angle is 1.8°, and the holding torque is 1.35N·m. The stepper motor driver adopts 2M542-N equal-angle constant-torque driver, and the controller adopts ZOZEN CW01 stepper motor controller. The vertical plate 15 is a cuboid metal plate, and the electrical connector of the tested product is a circular three-core electrical connector of 18M-3AE. The data of the plugging force characteristic curve of the electrical connector is read and stored.

What is not mentioned in the present invention is applicable to the prior art.

Claims (6)

1. an electric connector contact plug characteristic tester, comprise control module, control module comprises stepper motor driver and controller, controller provides instruction by stepper motor driver to stepper motor, it is characterized in that this tester also comprises mounting base, driver element, test cell and grip unit; Described driver element is arranged on mounting base, and test cell can slide on the line slideway of mounting base, and control module controls driver element action;

Described mounting base comprises base plate, filler strip, line slideway, guide rail slide block and riser; The upper surface both sides along its length of described base plate are connected to a filler strip; A line slideway is installed with at the upper surface of each filler strip, each line slideway is all provided with guide rail slide block, guide rail slide block can move left and right on corresponding line slideway, the length of described line slideway is identical with width with the length of filler strip with width, the lower end of described riser is fixedly connected with the left end of base plate with two filler strips, riser center has a comparatively large through-hole, the comparatively large through-hole peripheral circumferential on riser evenly has several comparatively minor thread through holes;

Described driver element comprises ball-screw, feed screw nut, travelling platform driving bracket, left leading screw bearing, right leading screw bearing, spring coupling, stepper motor mount pad and stepper motor; Described ball-screw is provided with feed screw nut, and feed screw nut and travelling platform drive bracket to be solidly installed, and ball-screw is packed on base plate by left leading screw bearing and right leading screw bearing; Described spring coupling one end is connected with one end of ball-screw, and the other end is connected with the motor shaft of stepper motor; Thus, ball-screw, stepper motor and spring coupling are solidly installed, and stepper motor is coaxially connected by spring coupling with ball-screw; Described stepper motor left side is arranged on stepper motor mount pad, and stepper motor is connected with control module, and the bottom of stepper motor mount pad is fixed on base plate;

Described test cell comprises digital display type contact engaging and separating force meter and travelling platform, the back side of described digital display type contact engaging and separating force meter is fixedly connected with the middle part of travelling platform, and the left end of digital display type contact engaging and separating force meter is mutually concordant with the left end of travelling platform, in travelling platform plane and the right side of the both sides, front and back and digital display type contact engaging and separating force meter that are positioned at digital display type contact engaging and separating force meter is equipped with through hole, in travelling platform plane and the through hole of both sides, front and back being positioned at digital display type contact engaging and separating force meter be connected with the upper surface of guide rail slide block, in travelling platform plane and the through hole being positioned at the right side of digital display type contact engaging and separating force meter drives the upper surface of bracket to be connected with travelling platform,

Described grip unit comprises A fixture and B fixture, and A fixture is used for clamping electrical connector male portion, and B fixture is used for clamping electrical connector receptacle portion; Described A fixture is hollow cylinder boss structure, and the left end external diameter of A fixture and the comparatively large through-hole of riser match, and are packed on riser by screw, and the inner chamber of hollow cylinder boss structure is fixing holds electric connector male portion; Described B fixture is bilateral screw shell structure, comprise the hollow cylindrical part that two internal diameters do not wait, and be equipped with internal thread in each columnar part, internal diameter and the tested electric connector jack segment outer radius of the columnar part that internal diameter is larger match, and the internal diameter of the columnar part that internal diameter is less and the test probe external diameter of digital display type contact engaging and separating force meter match; The right-hand member of B fixture is screwed onto on the test probe of digital display type contact engaging and separating force meter, and fixing, and A fixture and B fixture are to dress of feeling at ease.

2. electric connector contact plug characteristic tester according to claim 1, it is characterized in that described A fixture comprises ring part and small column part, ring part and small column part are coaxial integral piece, the end face of ring part along the circumferential direction evenly has several through holes, matching compared with the comparatively minor thread through hole in large through-hole peripheral circumferential on the through hole on ring part end face and riser, the left end external diameter of ring part and the comparatively large through-hole of riser match; The side surface circumference of the small column part of A fixture evenly has three threaded holes, in this threaded hole, is rotary with socket head cap screw, by this socket head cap screw, electric connector is fixedly clamped.

3. electric connector contact plug characteristic tester according to claim 1, it is characterized in that described stepper motor mount pad is the bending iron plate of " L " type, comprise bottom parts, riser part and strengthen baffle plate, bottom parts right-hand member and riser part lower end are fixed, and it is fixing to carry out reinforcement by reinforcement baffle plate, described reinforcement baffle plate is that baffle plate strengthened by triangle, and the bottom parts of stepper motor mount pad is fixedly connected with base plate; The riser part of stepper motor mount pad is fixed with stepper motor.

4. electric connector contact plug characteristic tester according to claim 1, is characterized in that described base plate is the thick iron metal plate of rectangle, and the thickness of described base plate, riser, travelling platform is all equal.

5. operation method when using electric connector contact as claimed in claim 1 plug characteristic tester to carry out electric connector contact plug characteristic test, concrete operation method is:

The first step, installation product to be tested electric connector:

Control module control step motor reversal, travelling platform moves right, after making to leave between A fixture and B fixture the distance being greater than product to be tested electric connector length, step motor stop; Product to be tested electric connector plugs together by normal operating condition, after removing external metallization plate armour, electric connector jack part is screwed in the perforate of the left end hollow cylindrical part of B fixture, and by recessed end holding screw locking; Stepper motor rotates forward, travelling platform is slowly moved to the left until the outer of product to be tested electric connector male portion props up the outer of the right-hand member of A fixture, product to be tested electric connector male portion embeds in the inner chamber of the hollow cylinder boss structure of A fixture, and be fixedly clamped, ensure that product to be tested electric connector is to feeling at ease dress;

Second step, carry out the plug characteristic test of product to be tested electric connector:

After bringing into operation, control module control step motor rotates forward, and drives ball screw turns, and then drive test cell to be moved to the left, the contact pin of product to be tested electric connector and jack are plugged together, carries out product to be tested update, step motor stop after plugging together completely also waits for 2-5 second; Then stepper motor reversion, drive test cell moves right, that carries out product to be tested electric connector extracts operation, the contact pin of product to be tested electric connector is separated with jack, step motor stop after getting back to initial position also waits for 2-5 second, in the process, test data is stored in PC through data line record by digital display type contact engaging and separating force meter; After so carrying out the cycle index specified, initial position got back to by test specimen, and stepper motor is out of service;

3rd step, draw product to be tested electric connector plug family curve according to test data:

Monitor the change with the plug time of contact engaging and separating force in swapping process continuously by digital display type contact engaging and separating force meter, go forward side by side line item and storage, utilize the Plotting data be stored in PC to go out product to be tested electric connector plug family curve.

6. operation method according to claim 5, is characterized in that the plug speed of product to be tested electric connector contact pin and jack in described operation method is per hourly be not more than 300 times.