A Universal Test Module and Method for Continuously Variable Pitch for Igniter Electrical Performance Testing

Abstract

A stepless pitch universal test module and method for igniter electrical performance testing, covering the field of igniter electrical performance testing, includes a corner bracket, a wedge-shaped pitch module, a product fixing base, and an elastic pressure base. The wedge-shaped pitch module includes a base and a wedge-shaped slider. The base is vertically slidably connected to the corner bracket and has mounting holes. Multiple probe holders are circumferentially located within the mounting holes, and each probe holder is horizontally slidably connected to the base along the radial direction of the circumference formed by the multiple probe holders. The wedge-shaped slider moves vertically relative to the base. Each probe holder has a first inclined surface at its bottom and a second inclined surface at its top. The upward movement of the wedge-shaped slider, through the interaction of the first and second inclined surfaces, causes the probe holders to move away from each other. The product fixing base and elastic pressure base are used to press the test piece firmly. The probe sets within the probe holders are inserted into the insertion holes of the product fixing base and contact the test piece. This method can be applied to the automated testing of the electrical performance of igniters with different pin pitches.

Description

Technical Field

[0001] This invention relates to a universal test module and method for continuously variable pitch, which is particularly suitable for testing the electrical performance of igniters. Background Technology

[0002] Pyrotechnics are widely used in aerospace launch vehicles and weapon systems. The electrical performance of the igniter is a key factor that determines the success or failure of ignition and whether it is safe and reliable. During the production process of the igniter, various electrical performance tests are involved, such as resistance testing, insulation resistance testing, and static discharge testing.

[0003] In the manual testing of electrical performance, the electrical connector used is still similar in technology to CN201621255393.1. After the igniter is inserted into the electrical connector, the built-in pin sleeve connects to the igniter's pins, forming a test circuit. Through the test circuit, the tester performs electrical performance tests. The electrical connector is designed for reliable connection. When connecting to the igniter, the igniter's pins need to be aligned with the connector's pin holes and pressed down with a certain force. At this time, the outer threaded sleeve of the electrical connector rotates as the product is inserted until it is fully rotated. To disconnect, the connector needs to be pulled down to unlock and the outer threaded sleeve rotated to unscrew the product. During use, the pin spacing of the electrical connector is fixed, and one type of igniter corresponds to one type of electrical connector. The electrical connector is manually replaced for each test. At the same time, the test life of the electrical connector is limited to 500 cycles according to the usage standard. The electrical performance testing process of igniters with multiple varieties and small batches will result in production stoppages due to multiple electrical connector replacements. The use of electrical connectors for automated electrical performance testing leads to frequent manual intervention in the testing process to replace electrical connectors, which is inefficient, costly, and difficult to apply to the automated electrical performance testing of igniters with different pin spacings.

[0004] Electrical connectors are no longer adequate for the needs of automated testing of igniter electrical performance, which requires universal compatibility with pyrotechnics of different pin pitches, long service life, and high pick-and-place efficiency. Summary of the Invention

[0005] The technical problem solved by this application is to overcome the shortcomings of the prior art and provide a stepless variable pitch universal test module and method for testing the electrical performance of igniters. It can be applied to the automated testing of the electrical performance of igniters with different pin pitches, and has a long service life and high pick-and-place efficiency.

[0006] The technical solution provided in this application is as follows:

[0007] Firstly, a stepless pitch universal test module for testing the electrical performance of igniters is provided, including a corner bracket, a wedge-shaped pitch module, probe holders, a product fixing base, and an elastic pressure base. The wedge-shaped pitch module includes a base and a wedge-shaped slider. The base is vertically slidably connected to the corner bracket and has mounting holes. Multiple probe holders are arranged in a circle within the mounting holes, and each probe holder is horizontally slidably connected to the base. The sliding direction of the probe holders and the base is radial along the circumference formed by the multiple probe holders. The probe holders are located in the wedge-shaped... Above the slider, the wedge-shaped slider moves vertically relative to the base. Each probe holder has a first inclined surface at its bottom and a second inclined surface at its top. The first and second inclined surfaces cooperate to move the wedge-shaped slider upwards, causing the probe holders to move away from each other. The base is equipped with a reset mechanism, which drives the probe holders to move towards the center of the circumference formed by the multiple probe holders. The product fixing seat and the elastic pressure seat are used to press the test piece. The probe holder has a probe set inserted into it. The probe set is inserted into the insertion hole of the product fixing seat and contacts the test piece.

[0008] In one implementation of the continuously variable pitch universal test module, the reset mechanism includes a reset spring, with at least one reset spring connected to each probe holder. One end of the reset spring contacts the probe holder and the other end contacts the base to provide a force for the probe holder to move toward the center position of the plurality of probe holders.

[0009] In one possible implementation of the continuously variable pitch universal test module, the base has horizontal through holes on its sides, which are connected to the mounting holes. The reset spring is located inside the mounting holes. A cover plate is fixedly connected to the side of the base, which covers the end of the through hole and presses the reset spring.

[0010] In one possible implementation of the continuously variable pitch universal test module, a spring limiting block is provided inside the through hole, the spring limiting block has a limiting hole, and the reset spring is located inside the limiting hole.

[0011] In one possible implementation of the continuously variable pitch universal test module, each probe holder leads out two test cables, the probe holder is connected to a probe sleeve, the test cables are connected to the probe sleeve, and after the probe group is inserted into the probe sleeve, the probe group is electrically connected to the test cable.

[0012] In one possible implementation of the continuously variable pitch universal test module, the product mounting base is located directly above the probe base. The upper surface of the product mounting base is provided with a coaxial placement groove and a mounting post. The height of the mounting post is the same as the depth of the placement groove. An insertion hole is opened on the mounting post. The test piece is inserted into the mounting post, and the test piece is located in the placement groove.

[0013] In one possible implementation of the continuously variable pitch universal test module, the base is fixedly connected to a spinning cylinder, the piston rod end of the spinning cylinder is connected to an elastic pressure seat, the elastic pressure seat is located directly above the product fixing seat, the spinning cylinder is used to drive the elastic pressure seat to move vertically, and two test cables are led out from the elastic pressure seat.

[0014] In one possible implementation of the continuously variable pitch universal test module, the corner seat is vertically slidably connected to a sliding platform, the base is fixedly connected to the sliding platform, and the sliding platform is also fixedly connected to a linear stepper motor, which is located below the base and is used to drive the wedge-shaped slider to move vertically.

[0015] In one possible implementation of the continuously variable pitch universal test module, the corner bracket is fixedly connected to a lifting cylinder, the piston rod end of the lifting cylinder is connected to the sliding platform, and the lifting cylinder is used to drive the sliding platform to move vertically.

[0016] Secondly, a method for testing the electrical performance of an igniter is provided, using any of the aforementioned continuously variable pitch universal test modules for testing the electrical performance of an igniter, including...

[0017] Place the part to be tested on the upper surface of the product holder;

[0018] Adjust the distance between the probe holders according to the test piece, including driving the wedge slider to move vertically. The wedge slider causes the distance between the probe holders to move closer or further apart until the distance between the probe holders is adapted to the test piece.

[0019] The base moves upward, and the base moves the probe holder and probe assembly upward together. The probe assembly is inserted into the socket of the product fixing base and makes electrical contact with the test piece.

[0020] The elastic pressure seat faces downwards, pressing the test piece firmly and making electrical contact.

[0021] In summary, this application includes at least the following beneficial technical effects:

[0022] (1) The wedge block variable pitch module used in this invention, combined with a linear stepper motor, achieves arbitrary pin pitch matching within the range of 2.5mm-12mm. Compared with the prior art, it can significantly reduce the amount of test connection tooling used.

[0023] (2) The present invention uses probe groups and probe sleeves to replace the electrical connectors in the prior art, increasing the test life from 500 times to 300,000 times, and greatly reducing the investment in electrical connectors.

[0024] (3) The present invention uses an elastic pressure seat, which can be adapted to igniters with a height of 20mm to 45mm. Compared with the prior art, it is more suitable for automated testing. Attached Figure Description

[0025] Figure 1 This is a simplified diagram of the mechanism of the present invention;

[0026] Figure 2 This is a schematic diagram of the internal structure of the present invention. Figure 1 ;

[0027] Figure 3 This is a schematic diagram of the internal structure of the present invention. Figure 2 ;

[0028] Figure 4 This is a schematic diagram of the probe holder structure and cable connection of the present invention;

[0029] Figure 5 This is a schematic diagram of the elastic pressure seat structure and cable connection of the present invention;

[0030] Figure 6 This is a schematic diagram of the fixing base structure of the product of the present invention.

[0031] Explanation of reference numerals: 1. Angle seat; 2. Slide rail; 3. Sliding platform; 4. Lifting cylinder; 5. Linear stepper motor; 6. Stepper motor mounting base; 7. Wedge block pitch-changing module; 8. Probe seat; 9. Probe sleeve; 10. Probe assembly; 11. Product mounting base; 12. Spinning cylinder; 13. Elastic pressure seat;

[0032] 71. Base; 72. Wedge-shaped slider; 721. Second inclined plane; 73. Spring limiting block; 74. Cover plate;

[0033] 81. First inclined plane. Detailed Implementation

[0034] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments. Although various aspects of embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated otherwise.

[0035] like Figure 1 , 2 As shown in the figure, this application discloses a continuously variable pitch universal test module for testing the electrical performance of igniters, such as... Figure 1 As shown, it includes corner bracket 1, slide rail 2, sliding platform 3, lifting cylinder 4, linear stepper motor 5, stepper motor mounting base 6, wedge block pitch module 7, probe base 8, probe sleeve 9, probe group 10, product mounting base 11, spinning cylinder 12, and elastic pressure base 13.

[0036] like Figure 1As shown, the slide rail 2 is vertically mounted on the side mounting surface of the corner bracket 1 by screws. The sliding platform 3 is mounted on the side of the corner bracket 1, and the sliding platform 3 is vertically slidably connected to the corner bracket 1 via the slide rail 2. The lifting cylinder 4 is fixed to the side mounting surface of the corner bracket 1 by a connector, and is on the same plane as the slide rail 2. The piston rod of the lifting cylinder 4 is fixedly connected to the sliding platform 3. The lifting cylinder 4 is located below the sliding platform 3. The piston extension and retraction of the lifting cylinder 4 will drive the sliding platform 3 to move vertically.

[0037] like Figure 1 As shown, a stepper motor mounting base 6 is fixedly mounted on the lower side of the mounting surface of the parallel angle seat 1 of the sliding platform 3 via a connector. The plane of the stepper motor mounting base 6 is perpendicular to the side of the sliding platform 3. A linear stepper motor 5 is fixed to the lower part of the stepper motor mounting base 6 via a connector. The linear stepper motor 5 passes through the stepper motor mounting base 6 and is connected to the upper wedge block pitch module 7.

[0038] like Figure 2 and Figure 3 As shown, the wedge block variable pitch module 7 includes a base 71, a wedge slider 72, a return spring, and a spring limiting block 73. The base 71 is fixedly installed on the upper side of the mounting surface of the parallel angle seat 1 of the sliding platform 3. A mounting hole is opened in the middle of the base 71. Four probe seats 8 are provided, arranged in a circle within the mounting hole, and each probe seat 8 is horizontally slidably connected to the base 71. The sliding direction of the probe seat 8 and the base 71 is radial along the circumference formed by the four probe seats 8. The probe seats 8 are located above the wedge slider 72. The bottom end of the wedge slider 72 is connected to a linear stepper motor 5, which drives the wedge slider 72 to move vertically up and down. Each probe holder 8 has a first inclined surface 81 at its bottom, and multiple second inclined surfaces 721 are provided at the top of the wedge slider 72. Each first inclined surface 81 cooperates with one second inclined surface 721. The four second inclined surfaces 721 make the top of the wedge slider 72 trapezoidal. When the wedge slider 72 moves vertically upward, the wedge slider 72 drives the probe holder 8 to move horizontally and move away from each other through the cooperation of the first inclined surfaces 81 and the second inclined surfaces 721. Horizontal through holes are opened on the four sides of the base 71. The through holes are connected to the mounting holes. The spring limiting block 73 is located in the through hole. The spring limiting block 73 has a limiting hole. The return spring is located in the limiting hole. The cover plate 74 is fixed to the side of the base 71 by bolts and covers the end of the through hole. Thus, the cover plate 74 can prevent the spring limiting block 73 and the return spring from moving out of the through hole. The reset spring is pressed between the probe seat 8 and the cover plate 74, so that when the wedge slider 72 moves vertically downward, the reset spring can push the different probe seats 8 to move horizontally closer to each other.

[0039] like Figure 2 , Figure 3 and Figure 4 As shown, the probe sleeve 9 is vertically fixed in the probe holder 8, and the probe assembly 10 is vertically inserted into the probe sleeve 9. Two test cables are led out from the probe holder 8 and connected to the probe sleeve 9. After the probe assembly 10 is inserted into the probe sleeve 9, the probe assembly 10 is electrically connected to the test cables. The probe holder 8 is made of rigid insulating special polymer material.

[0040] like Figure 6 As shown, a product mounting base 11 is coaxially positioned above the probe holder 8. The product mounting base 11 has mounting posts with four vertical insertion holes. The probe assembly 10 is inserted through the bottom of these holes and contacts the product under test. The product mounting base 11 also has a placement groove, the depth of which is less than the height of the mounting posts. The placement groove is coaxial with the mounting posts. After the product under test (igniter) is inserted into the mounting posts, it is positioned within the placement groove. A drive mechanism is connected to the product mounting base 11. This drive mechanism is connected to the corner bracket 1 and is mounted on the same body. The drive mechanism is used to move the product mounting base 11 horizontally until it is coaxial with the center lines of the four probe holders 8.

[0041] like Figure 1 As shown, the spinning cylinder 12 is fixedly connected to the side of the base 71. The spinning cylinder 12 is located on the side of the base 71 away from the sliding platform 3. The elastic pressure seat 13 is fixedly connected to the piston rod end of the spinning cylinder 12. The pressing part of the elastic pressure seat 13 is coaxial with the probe seat 8. The elastic pressure seat 13 is located above the product fixing seat 11.

[0042] like Figure 5 As shown, two test cables are led out from the elastic pressure seat 13. The elastic pressure seat 13 can float up and down, and is suitable for pyrotechnic products with a height of 20mm-45mm.

[0043] like Figure 6 As shown, the product holder 11 is a necessary component in this general test module, but it is separate from the test module. The corresponding product holder 11 can be replaced according to the pin pitch of the test piece. In automated testing, the product holder 11 can be automatically replaced.

[0044] A method for testing the electrical performance of an igniter, using the aforementioned continuously variable pitch universal test module for testing the electrical performance of an igniter, includes:

[0045] During testing, the linear stepper motor 5 rotates, driving the wedge slider 72 to move vertically. The wedge slider 72 slides against the inclined surface of the probe holder 8, causing the four circumferentially distributed probe holders 8 to synchronously contract or open, thus moving the probe group 10 and adjusting the test spacing of the probe group 10 to match the test piece. The test piece is then placed on the product holder 11.

[0046] After adjustment, the lifting cylinder 4 rises, driving the sliding platform 3 to move upward as a whole through the slide rail 2. The components fixedly installed on the sliding platform 3 move synchronously, and the spinning cylinder 12 will rise synchronously with the sliding platform 3. After moving into place, the probe group 10 is inserted into the product fixing seat 11 and connected to the test piece. Then, the spinning cylinder 12 drives the elastic pressure seat 13 to press down, and the elastic pressure seat 13 presses and fixes the test piece on the product fixing seat 11.

[0047] The elastic pressure seat 13 contacts the device under test to form a test circuit. Through the eight test cables led out from the four probe seats 8 and the two test cables led out from the elastic pressure seat 13, the four-wire electrical performance test of any two of the five test points of the device under test can be realized.

[0048] according to Figures 1-6 The stepless variable pitch universal test module for testing the electrical performance of igniters, consisting of the aforementioned mechanism and connection relationship, only needs to automatically switch between different product mounting bases 11 and adjust the spacing of the probe bases 8 by the linear stepper motor 5, so that it can adapt to pyrotechnic products with a height of 20mm to 45mm and a needle pitch of 2.5mm to 12mm.

[0049] The present application has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present application. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and implementation methods of the present application without departing from the spirit and scope of the present application, and all such modifications and improvements fall within the scope of the present application. The scope of protection of the present application is determined by the appended claims.

[0050] The contents not described in detail in this application specification are common knowledge to those skilled in the art.

Claims

1. A variable pitch universal test module for electrical performance testing of igniters, characterized by: The device comprises a corner base (1), a wedge-shaped variable-distance module (7), a probe base (8), a product fixing base (11) and an elastic pressing base (13); The wedge-shaped variable-distance module (7) comprises a base (71) and a wedge-shaped sliding block (72), the base (71) is vertically and slidingly connected to the corner base (1), the base (71) is provided with a mounting hole, a plurality of probe bases (8) are arranged in the mounting hole in a circular manner, and each probe base (8) is horizontally and slidingly connected to the base (71), and the sliding direction of the probe base (8) and the base (71) is the radial direction of the circle formed by the plurality of probe bases (8); The probe base (8) is located above the wedge-shaped sliding block (72), the wedge-shaped sliding block (72) moves vertically relative to the base (71), the bottom of each probe base (8) is provided with a first inclined surface (81), the top of the wedge-shaped sliding block (72) is provided with a second inclined surface (721), and the first inclined surface (81) and the second inclined surface (721) are matched to drive the wedge-shaped sliding block (72) to move upwards and drive the probe bases (8) to move away from each other; The base (71) is provided with a reset mechanism, and the reset mechanism is used for driving the probe base (8) to move towards the center of the circle formed by the plurality of probe bases (8). The product fixing base (11) and the elastic pressing base (13) are used for pressing the to-be-tested member, a probe group (10) is inserted into the probe base (8), the probe group (10) is inserted into the insertion hole of the product fixing base (11) and contacts the to-be-tested member.

2. A variable pitch universal test module for electrical performance testing of an igniter according to claim 1, characterized in that: The reset mechanism comprises a reset spring, each probe base (8) is connected to at least one reset spring, one end of the reset spring contacts the probe base (8), the other end of the reset spring contacts the base (71), and the reset spring provides a force for the probe base (8) to move towards the center of the plurality of probe bases (8).

3. A variable pitch universal test module for electrical performance testing of an igniter according to claim 2, characterized in that: The side surface of the base (71) is provided with a horizontal through hole, the through hole is communicated with the mounting hole, the reset spring is located in the mounting hole, the side surface of the base (71) is fixedly connected with a cover plate (74), the cover plate (74) covers the end of the through hole and presses the reset spring.

4. A variable pitch universal test module for electrical performance testing of an igniter according to claim 3, wherein: The through hole is provided with a spring limiting block (73), the spring limiting block (73) is provided with a limiting hole, and the reset spring is located in the limiting hole.

5. A variable pitch universal test module for electrical performance testing of igniters as defined in claim 1, wherein: Each probe base (8) is provided with two test cables, the probe base (8) is connected with a probe sleeve (9), the test cable is connected with the probe sleeve (9), the probe group (10) is inserted into the probe sleeve (9), and the probe group (10) is electrically connected with the test cable.

6. A variable pitch universal test module for electrical performance testing of igniters as defined in claim 1, wherein: The product fixing base (11) is located directly above the probe base (8), the upper surface of the product fixing base (11) is provided with a coaxial placement groove and a mounting column, the height of the mounting column is equal to the depth of the placement groove, the insertion hole is arranged in the mounting column, the to-be-tested member is inserted into the mounting column, and the to-be-tested member is located in the placement groove.

7. A variable pitch universal test module for electrical performance testing of igniters as defined in claim 1, wherein: The base (71) is fixedly connected with a rotary pressing cylinder (12), the piston rod end of the rotary pressing cylinder (12) is connected with the elastic pressing base (13), the elastic pressing base (13) is located directly above the product fixing base (11), the rotary pressing cylinder (12) is used for driving the elastic pressing base (13) to move vertically, and the elastic pressing base (13) is provided with two test cables.

8. A variable pitch universal test module for electrical performance testing of igniters as defined in claim 1, wherein: The corner seat (1) is vertically and slidingly connected with a sliding platform (3), the base (71) is fixedly connected with the sliding platform (3), the sliding platform (3) is further fixedly connected with a linear stepping motor (5), the linear stepping motor (5) is located below the base (71), and the linear stepping motor (5) is used for driving the wedge-shaped sliding block (72) to vertically move.

9. A variable throw universal test module for electrical performance testing of an igniter as defined in claim 8, wherein: The corner seat (1) is fixedly connected with a lifting cylinder (4), the piston rod end of the lifting cylinder (4) is connected with the sliding platform (3), and the lifting cylinder (4) is used for driving the sliding platform (3) to vertically move.

10. A method for electrical performance testing of an igniter, characterized by: The test is performed by using the stepless variable-pitch universal test module for testing the electrical performance of an igniter according to any one of claims 1-9, comprising Placing the to-be-tested member on the upper surface of the product fixing seat (11); Adjusting the distance between the probe seats (8) according to the to-be-tested member, comprising driving the wedge-shaped sliding block (72) to vertically move, the wedge-shaped sliding block (72) driving the distance between the probe seats (8) to approach or move away from each other until the distance between the probe seats (8) is adapted to the to-be-tested member; Driving the base (71) to move upward, the base (71) driving the probe seats (8) and the probe group (10) to move upward together, the probe group (10) being inserted into the insertion hole of the product fixing seat (11) and being in electrical contact with the to-be-tested member; The elastic pressing seat (13) is downward, the to-be-tested member is pressed tightly and is in electrical contact. The elastic pressing seat (13) is downward, the to-be-tested member is pressed tightly and is in electrical contact.

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