CN113237589A - Parallel detection head for retention force of electric connector contact - Google Patents
Parallel detection head for retention force of electric connector contact Download PDFInfo
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- CN113237589A CN113237589A CN202110464578.2A CN202110464578A CN113237589A CN 113237589 A CN113237589 A CN 113237589A CN 202110464578 A CN202110464578 A CN 202110464578A CN 113237589 A CN113237589 A CN 113237589A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
Abstract
The invention belongs to the field of testing, and relates to a parallel detection head for retention force of a contact element of an electric connector. The invention can realize the high-efficiency, accurate and automatic verification and output of the retention force of all the contact elements of the connector in a single test, avoids the missing detection/false detection risks caused by manual verification one by one, and has important significance for improving the working reliability of the cable connector, ensuring the safety of an electrical system and improving the production efficiency.
Description
Technical Field
The invention belongs to the field of testing, and relates to a parallel detection head for retention force of a contact element of an electric connector.
Background
The electric connector is a connecting device of electric signals widely used in current engineering, electric energy transmission is realized mainly through contact of paired electric connector contact pieces, and quality and reliability of the electric connector are directly related to success or failure of the whole system engineering. In order to avoid the electric connection failure in the whole system caused by the contact retracting, the contact holding force needs to be tested one by one manually, and if the contact withdraws from the electric connector base, the holding force is unqualified. Because the connector model number is various, and the contact is more in quantity, and the distribution is intensive moreover, and manual measurement work load is big, and is inefficient to can appear the false retrieval, miss the problem of examining, consequently need a testing arrangement that can realize parallel detection, thereby reach and detect high efficiency, accurate, automatic output.
At present, a mechanical spring pointer force measuring tool is mainly used for testing the retention force of a contact element of a connector, a specific measuring head is needed, the tool and the contact element are aligned manually, the tool is pressed until a sliding block is aligned with an indication mark, and if the contact element does not exit, the retention force is qualified; and exiting, and failing. The testing process is complicated, point-by-point testing is achieved, and the defects of high labor intensity, low working efficiency, high missing/false detection risk and the like exist. US3879997 "pressure Check Apparatus for Electrical Connector Contacts" describes a pressure device that allows simultaneous inspection of a multi-contact Electrical Connector, primarily by applying air pressure to a plurality of pistons that in turn apply such pressure to the contact being tested, and withdrawing the corresponding contact if the contact retention force is not acceptable. Although the device realizes multi-point simultaneous detection and improves the working efficiency, the contact alignment has difficulty, and the contact condition needs to be observed manually after the detection is finished, so that automatic output display cannot be realized. Chinese patent CN106568536A, "a connector retention force testing device", describes a method for indirectly obtaining the retention force of a contact by measuring the displacement of a spring probe with a displacement sensor. Specifically, a butt joint assembly and a test assembly are arranged on an installation platform, a contact pin in the butt joint assembly is tested point by point, and the elastic force generated by the deformation of a spring is compared with the holding force of the connector, so that whether the holding force of the connector is qualified is judged. The device has replaced artifical test, has improved the measuring accuracy to a certain extent, but single-point measurement work load is great, and work efficiency is lower.
Disclosure of Invention
The invention aims to overcome the defects and provide a parallel detection device for efficiently, accurately and automatically detecting and outputting the retention force of the contact element of the electric connector. In order to solve the problems of complicated detection operation process of the retention force of the electric connector, low single-point detection efficiency, missing detection and false detection in manual reading and the like, the parallel detection head matched with the electric connector to be detected is designed to realize synchronous detection of the retention force of a contact element of the electric connector, and pressure signals are converted into resistance signals to be output through the force sensitive film and the interdigital electrodes to realize accurate and automatic detection.
The technical scheme of the invention is as follows:
a parallel detection head for retention force of a contact element of an electric connector mainly comprises a parallel measuring head 11, a measuring head fixing plate 12, a parallel measuring needle 10, an elastic body 9, a force sensitive film 8, an interdigital electrode plate 7, a flexible flat cable connector 4, a flexible flat cable 3, a packaging plate 6, a set screw 2, a positioning pin 1, a fixing screw 13 and a nut 5.
The parallel measuring head 11 is of a cylindrical structure, a spline j and a fifth screw hole e are arranged on the periphery of the parallel measuring head, the size of the spline j is in clearance fit with the size of a key groove of the tested electric connector, and the parallel measuring head 11 can axially move in the key groove in the tested electric connector while realizing positioning through the spline; the parallel measuring head 11 is internally provided with a plurality of measuring pin holes d along the axial direction, the hole positions of the measuring pin holes are in one-to-one correspondence with the hole positions of the contact elements of the tested electric connector, the measuring pin holes d are inner holes of a step structure, a small-diameter inner hole is coaxial with a large-diameter inner hole, the small-diameter inner hole is used for axial guiding of the parallel measuring pin 10, the large-diameter inner hole is used for installing a force sensitive film 8 and an elastic body 9, a step surface between the small-diameter inner hole and the large-diameter inner hole is a plane perpendicular to the axis of the hole, and axial movement limiting of the parallel measuring pin 10 is achieved through the step surface.
The measuring head fixing plate 12 is a square plate, a fourth screw hole b is formed in the side end face of the measuring head fixing plate 12, a through hole is formed in the center of the measuring head fixing plate 12, the inner surface structure of the through hole is the same as the appearance structure of the parallel measuring head 11, the size of a key groove a of the measuring head fixing plate 12 is the same as that of a key groove of the tested electric connector, the parallel measuring head 11 is positioned in the measuring head fixing plate 12 through the key groove a, the parallel measuring head 11 is completely fixed in the measuring head fixing plate 12 through the matching of a set screw 2 and the fourth screw hole b, and the rear end face of the parallel measuring head 11 is flush with the rear end face of the measuring head fixing plate 12 at the moment; the probe fixing plate 12 has first positioning holes c and first screw holes k at four corners.
The parallel measuring probe 10 is of a stepped shaft structure, the small-diameter part of the parallel measuring probe is arranged in a small-diameter inner hole of the measuring probe hole d, and the fit clearance is 0.01-0.1 mm, so that the axial guide of the parallel measuring probe 10 is realized; the large-diameter part of the parallel measuring pin is arranged in a large-diameter inner hole of the measuring pin hole d, the fit clearance is 0.1-0.5 mm, and the axial movement of the parallel measuring pin 10 in the measuring pin hole d is limited through a step surface between the large diameter and the small diameter.
The force-sensitive film 8 and the elastic body 9 are arranged in the large-diameter inner hole of the pin hole d, and the fit clearance between the force-sensitive film and the large-diameter inner hole is 0.1-0.5 mm. The elastic body 9 is positioned between the force-sensitive film 8 and the large-diameter end part of the parallel measuring pin 10, transmits the contact holding force sensed by the parallel measuring pin 10 to the force-sensitive film 8, and performs axial rebound resetting on the parallel measuring pin 10 after the holding force test is finished; the force-sensitive film 8 senses the change of the magnitude of the contact holding force transmitted by the parallel probe 10 and the elastic body 9, and outputs a corresponding resistance value. The force sensitive film 8, the rear end face of the parallel measuring head 11 and the rear end face of the measuring head fixing plate 12 are on the same plane.
The interdigital electrode plate 7 is a printed circuit board, and four corners of the interdigital electrode plate are provided with a second positioning hole o and a second screw hole f; the front surface of the interdigital electrode plate 7 is contacted with the rear end surface of the parallel measuring head 11; the interdigital electrode L is directly contacted with the force-sensitive film 8, and a resistance value change signal of the force-sensitive film 8 along with the change of the contact holding force is output, and finally, acquisition processing and analysis are carried out. The front and back leads of the interdigital electrode plate 7 are connected through a via hole m, the position of the interdigital electrode L corresponds to the position of a probe hole d of the parallel probe 11, one end of each interdigital electrode L is collinear, and the other end is led out independently and finally connected with a pin n of the flexible flat cable connector 4.
The flexible flat cable connector 4 is welded on the back of the interdigital electrode plate 7, and the flexible flat cable 3 is connected on the flexible flat cable connector 4.
The lower end of one end face of the packaging plate 6 is provided with a groove g which is contacted with the back face of the interdigital electrode plate 7 and gives way for the flexible flat cable connector 4 on the interdigital electrode plate 7; the four corners of the packaging plate 6 are provided with third positioning holes h and third screw holes i; the third positioning hole h, the second positioning hole o and the first positioning hole c are consistent, and the packaging plate 6, the interdigital electrode plate 7 and the measuring head fixing plate 12 are positioned by matching with the positioning pin 1; the third screw hole i and the second screw hole f are consistent with the first screw hole k in hole site, and the packaging plate 6, the interdigital electrode plate 7 and the probe fixing plate 12 are fastened through the matching of the fixing screw 13 and the nut 5.
The invention has the beneficial effects that: compared with the prior art, the method can realize high-efficiency, accurate and automatic verification and output of the retention force of all contact elements of the connector in a single test, avoids the risks of missing detection/false detection caused by manual verification one by one, and has important significance for improving the working reliability of the cable connector, ensuring the safety of an electrical system and improving the production efficiency.
Drawings
FIG. 1 is a diagram of a structure of an electrical connector under test;
FIG. 2 is a general view of the assembly of the parallel test heads;
FIG. 3 is an exploded view of a parallel detection head structure;
FIG. 4 is a cross-sectional view of a stylus bore of a parallel stylus;
FIG. 5 is a front side line drawing of an interdigital electrode plate;
FIG. 6 is a back wiring diagram of an interdigital electrode plate;
FIG. 7 is an enlarged structure view of the interdigital electrode;
in the figure: 1-positioning pin, 2-set screw, 3-flexible flat cable, 4-flexible flat cable connector, 5-nut, 6-packaging plate, 7-interdigital electrode plate, 8-force sensitive film, 9-elastomer, 10-parallel measuring pin, 11-parallel measuring head, 12-measuring head fixing plate, 13-fixing screw, a-key groove, b-fourth screw hole, c-first positioning hole, d-measuring pin hole, e-fifth screw hole, f-second screw hole, g-groove, h-third positioning hole, i-third screw hole, j-spline, k-first screw hole, L-interdigital electrode, m-via hole, n-pin and o-second positioning hole.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 2 and fig. 3, the parallel detection head for holding force of the contact element of the electrical connector of the present invention mainly comprises a parallel measuring head 11, a measuring head fixing plate 12, a parallel measuring pin 10, an elastic body 9, a force sensitive film 8, an interdigital electrode plate 7, a flexible flat cable connector 4, a flexible flat cable 3, a packaging plate 6, a set screw 2, a positioning pin 1, a fixing screw 13 and a nut 5.
As shown in fig. 4, the parallel probe 11 is made of any one of steel, aluminum or copper, a spline j and a fifth screw hole e are formed on the circumference, and the dimension of the spline j is in clearance fit with the dimension of the key groove of the electrical connector to be tested, so that the parallel probe 11 can axially move in the key groove of the electrical connector to be tested while being positioned by the spline; the parallel measuring head 11 is internally provided with a plurality of measuring pin holes d, the hole positions of the measuring pin holes are in one-to-one correspondence with the hole positions of the contact elements of the tested electric connector, the measuring pin holes d are inner holes of a step structure, the small-diameter inner hole is coaxial with the large-diameter inner hole, the small-diameter inner hole is used for axial guiding of the parallel measuring pin 10, the large-diameter inner hole is used for installation of the force sensitive film 8 and the elastic body 9, the step surface between the small-diameter inner hole and the large-diameter inner hole is a plane perpendicular to the axis of the hole, and axial movement limiting of the parallel measuring pin 10 is achieved through the step surface. The hole position tolerance of the pin hole d is guaranteed to be within +/-0.01-0.05 mm, and accurate matching of the parallel measuring head 11 and the hole position of the connector to be measured is guaranteed.
The measuring head fixing plate 12 is a square plate, a fourth screw hole b is arranged on the side end face, a through hole is arranged in the center of the measuring head fixing plate 12, the inner surface structure of the through hole is the same as the appearance structure of the parallel measuring head 11, the size of a key groove a of the measuring head fixing plate 12 is the same as that of a key groove of a measured point connector, the parallel measuring head 11 is positioned in the measuring head fixing plate 12 through the key groove a, the parallel measuring head 11 is completely fixed in the measuring head fixing plate 12 through the matching of a set screw 2 and the fourth screw hole b, and the rear end face of the parallel measuring head 11 is flush with the rear end face of; the probe fixing plate 12 serves as an intermediate body to fix the parallel probe 11 and the interdigital electrode plate 7 together.
The parallel measuring probe 10 is of a stepped shaft structure, and the small diameter of the contact pin type contact is 0.2-0.5 mm larger than the diameter of the contact, so that the measuring probe 10 can be completely contacted with the contact; for the jack type contact element, the small diameter of the jack type contact element is 0.2-0.5 mm smaller than the aperture of the contact element, and meanwhile, the head of the small diameter is provided with a fillet, so that the probe 10 can be completely inserted into a round hole of the contact element. The parallel measuring pin 10 is arranged in the measuring pin hole d, the small-diameter part is arranged in the small-diameter inner hole of the measuring pin hole d, the fit clearance is 0.01mm, and axial guiding is realized; the large-diameter part is arranged in a large-diameter inner hole of the pin measuring hole d, the fit clearance is 0.1mm, the axial movement of the parallel measuring pin 10 is limited through a step end face between the small-diameter inner hole and the large-diameter inner hole, the total length of the exposed length of the small-diameter end of the parallel measuring pin 10 and the exposed length of the spline j of the parallel measuring head 11 is 5-10 mm longer than the distance between the contact element and the end face of the electric connector, and the parallel measuring pin 10 and the contact element can be ensured to be in complete contact in the process of testing the holding power of the parallel measuring head 11 and the electric connector to be tested.
The elastomer 9 is made of any one of elastic polymer high molecular materials such as rubber, polyurethane and the like. When the elastic body 9 is subjected to pressure and radially expands, the outer diameter size is 0.2 mm-0.4 mm smaller than the aperture, and the phenomenon that the blockage cannot rebound in the pin measuring hole d is prevented. The elastic body 9 is mounted in a stylus hole d of the parallel stylus 11, one end of which is in contact with the large-diameter end face of the parallel stylus 10. The main function of the device is force transmission and rebound, on one hand, the parallel measuring needle transmits the borne pressure to the force sensitive film 8 through the elastic body 9, and on the other hand, the parallel measuring needle 10 can automatically reset after unloading the pressure.
The force-sensitive film 8 is a pressure-sensitive material, is obtained by mixing, stirring and drying one or more of polyurethane, silicon rubber and other high polymer materials as a base material and graphene, carbon black, carbon nanotubes, indium tin oxide and the like as conductive particles, has a negative pressure resistance effect, and gradually reduces the resistance with the increase of pressure. The force-sensitive film 8 is arranged in a large-diameter hole of the pin measuring hole d, one end of the force-sensitive film is contacted with the end face of the elastic body 9, the other end of the force-sensitive film is contacted with the interdigital electrode L of the interdigital electrode plate 7, and finally the rear end faces of the force-sensitive film 8, the parallel measuring head 11 and the measuring head fixing plate 12 are on the same plane.
As shown in fig. 5 to 7, the interdigital electrode plate 7 is a printed circuit board, the second positioning hole o of the interdigital electrode plate 7 is consistent with the first positioning hole c of the probe fixing plate 12, and the positioning with the probe fixing plate 12 is realized by the positioning pin 1. The front surface of the interdigital electrode plate 7 is provided with a plurality of interdigital electrodes L exposed outside, and the interdigital electrodes L are directly contacted with the force sensitive film 8, so that the surface of the interdigital electrodes L is subjected to a gold deposition process for preventing the interdigital electrodes L from being oxidized and worn. The front and back leads of the interdigital electrode plate 7 are connected through a via hole m, the position of the interdigital electrode L corresponds to the position of a probe hole d of the parallel probe 11, one end of each interdigital electrode L is collinear, and the other end is led out independently and finally connected with a pin n of the flexible flat cable connector 4.
The minimum pin n interval of the flexible flat cable connector 4 can reach 0.5mm, the flexible flat cable connector 4 is welded on the back surface of the interdigital electrode plate by utilizing the surface mounting technology, and then the flexible flat cable 3 is connected on the flexible flat cable connector 4.
The lower end of one end face of the packaging plate 6 is provided with a groove g which is contacted with the back face of the interdigital electrode plate 7 and is mainly used for avoiding the flexible flat cable connector 4 on the interdigital electrode plate 7; the third positioning hole h, the second positioning hole o and the first positioning hole c are consistent, and the packaging plate 6, the interdigital electrode plate 7 and the measuring head fixing plate 12 are positioned by matching with the positioning pin 1; the third screw hole i and the second screw hole f are consistent with the first screw hole k in hole site, and the packaging plate 6, the interdigital electrode plate 7 and the probe fixing plate 12 are fastened through the matching of the fixing screw 13 and the nut 5.
The device comprises the following specific installation steps:
(1) firstly, assembling a spline j of the parallel measuring head 11 and a key groove a of the fixing plate 12 to realize positioning, and then fixing the parallel measuring head 11 on the measuring head fixing plate 12 through a set screw 2;
(2) then the parallel measuring needle 10, the elastic body 9 and the force sensitive film 8 are sequentially assembled in each measuring needle hole d of the parallel measuring head 11 according to the sequence, and finally the force sensitive film 8, the rear end face of the parallel measuring head 11 and the rear end face of the measuring head fixing plate 12 are on the same plane;
(3) welding a flexible flat cable connector 4 on the interdigital electrode plate 7, and installing a flexible flat cable 3 on the flexible flat cable connector 4;
(4) and the probe fixing plate 12, the interdigital electrode plate 7 and the packaging plate 6 are sequentially positioned by the positioning pin 1, and finally the probe fixing plate 12, the interdigital electrode plate 7 and the packaging plate 6 are integrally packaged by the fixing screw 13 and the nut 5, so that the integrity and the compactness of the detection device are ensured.
Examples
Taking an electric connector to be tested as shown in figure 1, enabling a parallel measuring pin 10 to be in contact with a contact element along an internal key slot, then applying pressure to the contact element through a parallel detection device by a loading device, if the contact element of the connector does not have a pin withdrawing phenomenon, enabling the contact element to have a reaction force on the parallel measuring pin 10, and finally enabling conductive particles in the force sensitive film 8 to gradually contact and enabling the resistance to remarkably drop as the parallel measuring pin 10, the elastomer 9, the force sensitive film 8 and the interdigital electrode L are respectively in a contact state and through the layer-by-layer transmission of force, enabling the force sensitive film 8 to be subjected to the pressure action, enabling the interdigital electrode L to be in a conduction state from a disconnection state, and converting a pressure signal into a resistance signal to be output; if the contact elements are subjected to the needle withdrawing phenomenon after being stressed and no reaction force is transmitted to the parallel measuring needle 10, the corresponding circuits are in an open circuit state, the corresponding interdigital electrodes L are in a high resistance state, finally resistance signals corresponding to all the contact elements are transmitted to a rear-end acquisition module for data processing, and if the resistance is in the range of the retention force, the retention force is qualified; otherwise, the result is unqualified.
Claims (2)
1. The parallel detection head for the retention force of the contact element of the electric connector is characterized by mainly comprising a parallel measuring head (11), a measuring head fixing plate (12), a parallel measuring pin (10), an elastic body (9), a force sensitive film (8), an interdigital electrode plate (7), a flexible flat cable connector (4), a flexible flat cable (3), a packaging plate (6), a set screw (2), a positioning pin (1), a fixing screw (13) and a nut (5);
the parallel measuring head (11) is of a cylindrical structure, a spline (j) and a fifth screw hole (e) are arranged on the periphery of the parallel measuring head, the size of the spline (j) is in clearance fit with the size of a key groove of the electric connector to be measured, and the parallel measuring head (11) can axially move in the key groove in the electric connector to be measured while realizing positioning through the spline; a plurality of pin measuring holes (d) are axially formed in the parallel measuring head (11), and the hole positions correspond to the positions of the hole positions of the contact element of the tested electric connector one by one; the pin measuring holes (d) are inner holes of stepped structures, the small-diameter inner hole is coaxial with the large-diameter inner hole, the small-diameter inner hole is used for axial guiding of the parallel pin measuring (10), the large-diameter inner hole is used for mounting the force sensitive film (8) and the elastic body (9), a step surface between the small-diameter inner hole and the large-diameter inner hole is a plane perpendicular to the axis of the hole, and axial movement limiting of the parallel pin measuring (10) is achieved through the step surface;
the measuring head fixing plate (12) is a square plate, a fourth screw hole (b) is formed in the side end face of the measuring head fixing plate, a through hole is formed in the center of the measuring head fixing plate (12), the inner surface structure of the through hole is the same as the appearance structure of the parallel measuring head (11), the size of a key groove (a) of the measuring head fixing plate (12) is consistent with the size of a key groove of a measured electric connector, the parallel measuring head (11) is positioned in the measuring head fixing plate (12) through the key groove (a), the parallel measuring head (11) is completely fixed in the measuring head fixing plate (12) through the matching of a set screw (2) and the fourth screw hole (b), and the rear end face of the parallel measuring head (11) is parallel to the rear end face; four corners of the measuring head fixing plate (12) are provided with a first positioning hole (c) and a first screw hole (k);
the parallel measuring probe (10) is of a stepped shaft structure, the small diameter part is arranged in a small diameter inner hole of the measuring probe hole (d) to realize axial guiding of the measuring probe (10), the large diameter part is arranged in a large diameter inner hole of the measuring probe hole (d), and the axial movement of the parallel measuring probe (10) in the measuring probe hole (d) is limited through a step end face between the large diameter and the small diameter;
the force-sensitive film (8) and the elastic body (9) are arranged in a large-diameter inner hole of the needle measuring hole (d), and the elastic body (9) is positioned between the force-sensitive film (8) and the large-diameter end part of the parallel needle measuring (10); the force-sensitive film (8), the rear end face of the parallel measuring head (11) and the rear end face of the measuring head fixing plate (12) are on the same plane;
the interdigital electrode plate (7) is a printed circuit board, and four corners of the interdigital electrode plate are provided with a second positioning hole (o) and a second screw hole f; the interdigital electrode plate (7) is contacted with the rear end face of the parallel measuring head (11), and the interdigital electrode (L) is directly contacted with the force sensitive film (8); the front and back leads of the interdigital electrode plate (7) are connected through a through hole (m), the position of an interdigital electrode (L) corresponds to the position of a probe hole (d) of the parallel probe (11), one end of each interdigital electrode (L) is collinear, and the other end is led out independently and finally connected with a pin (n) of the flexible flat cable connector (4);
the flexible flat cable connector (4) is welded on the back surface of the interdigital electrode plate (7), and the flexible flat cable (3) is connected to the flexible flat cable connector (4);
the lower end of one end face of the packaging plate (6) is provided with a groove (g) which is contacted with the back face of the interdigital electrode plate (7) and gives way for the flexible flat cable connector (4) on the interdigital electrode plate (7); the four corners of the packaging plate (6) are provided with third positioning holes (h) and third screw holes (i); the hole positions of the third positioning hole (h) and the second positioning hole (o) are consistent with the hole position of the first positioning hole (c), and the packaging plate (6), the interdigital electrode plate (7) and the measuring head fixing plate (12) are positioned by matching with the positioning pin (1); the third screw hole (i) and the second screw hole (f) are consistent with the first screw hole (k), and the packaging plate (6), the interdigital electrode plate (7) and the probe fixing plate (12) are fastened through the matching of the third screw hole (i) and the second screw hole (f) with the fixing screw (13) and the nut (5).
2. The parallel probe head for electrical connector contact retention according to claim 1, wherein the parallel probe head (11) is made of any one of steel, aluminum or copper; the elastomer (9) is made of rubber or polyurethane; the force-sensitive film (8) is made of pressure-sensitive material.
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