Clamping device matched with electrical performance test of PCB (Printed Circuit Board)

Abstract

The utility model provides a clamping device matched with a PCB electrical performance test. The clamping device comprises a bottom plate, a wire coil, a needle disc and a wire harness block fixing frame. The wire harness block fixing frame comprises a mounting frame, a mounting frame cover plate and a plurality of fixing frame supporting columns, the mounting frame cover plate is connected with the mounting frame through the fixing frame supporting columns, and one side edge of the mounting frame extends into the bottom plate and is connected with the bottom plate through a plurality of connecting blocks; the needle discs are stacked on the wire coil, and the wire coil is connected to the bottom plate through a plurality of wire coil copper columns; the dial comprises a plurality of resin plates which are stacked at equal intervals and a plurality of dial copper columns. The clamping device matched with the PCB electrical performance test effectively solves the problems that a test jig is not matched with a machine table, the coverage rate of PCB circuit resistance test is low and the like, through redesigning a connection structure, a wire harness block fixing frame with larger weight can be more stably connected to the bottom plate, the service life of equipment is longer, and the reliability is higher.

Description

Technical Field

[0001] The utility model relates to the field of auxiliary equipment for production and testing of printed circuit boards, in particular to a clamping device for cooperating with PCB electrical performance testing. Background Art

[0002] Printed circuit boards, usually referred to as PCBs, need to undergo a series of tests during and after production. One of these tests is the need to perform continuity / insulation / resistance tests on the PCBs that have already been laid out. These tasks, of course, need to be performed on a dedicated tester. The tester is usually fixed, but since there are various PCB models, a dedicated clamping device needs to be designed for each model so that the PCB can be connected to the tester.

[0003] As the circuits on printed circuit boards become more complex, the board size often does not change, and may even become smaller. Therefore, the conductive contact area on the printed circuit board becomes smaller and denser, which poses more challenges to the installation of test pins on the clamping device. The test pins also need to be smaller, which makes them easier to bend. In the case of high density, they are prone to mutual contact and interference. In addition, with the increase in test circuits, the weight of the circuit board is also greater, resulting in greater force between the circuit board and the connected base plate, and a reduced service life. Utility Model Content

[0004] Based on this, it is necessary to provide a clamping device for PCB electrical performance testing to address at least one of the above-mentioned problems.

[0005] The clamping device provided in the utility model application for PCB electrical performance testing includes a base plate, a wire reel, a needle reel and a wire harness block fixing frame;

[0006] The harness block fixing frame comprises a mounting frame, a mounting frame cover plate and a plurality of fixing frame pillars, the mounting frame cover plate is connected to the mounting frame through the fixing frame pillars, and a side edge of the mounting frame extends into the bottom plate and is connected to the bottom plate through a plurality of connecting blocks;

[0007] The needle disk is stacked on the wire disk, and the wire disk is connected to the bottom plate through a plurality of wire disk copper columns; the needle disk comprises a plurality of resin plates stacked at equal intervals and a plurality of needle disk copper columns.

[0008] In one of the embodiments, at least three groups of hollow grooves are provided on one side edge of the mounting frame, each group of hollow grooves includes a first hollow groove and a second hollow groove, and a fixing frame combining block is provided at each group of hollow grooves, and both ends of the fixing frame combining block respectively pass through the first hollow groove and the second hollow groove to be connected to the base plate.

[0009] In one embodiment, the fixing frame combining block includes a transverse plate and protrusions respectively arranged at two ends of the transverse plate, and the protrusions are provided with through holes.

[0010] In one of the embodiments, the resin board is provided with test pin through holes, and the test pin through holes on two adjacent resin boards correspond to each other one by one.

[0011] In one of the embodiments, the test pin through holes on two adjacent resin boards are arranged to be offset with a preset spacing.

[0012] In one of the embodiments, the hole of the test needle through hole on the resin plate at the top end of the needle disk is inclined.

[0013] The technical solution provided in the embodiments of the present invention brings the following beneficial technical effects:

[0014] The clamping device provided by the utility model for PCB electrical performance testing effectively solves the problems of mismatch between the test fixture and the machine and low coverage of PCB line resistance test. By redesigning the connection structure, the heavier wiring harness block fixing frame can be more stably connected to the base plate, the service life of the equipment is longer, and the reliability is higher. Through several layers of resin boards, the test needle can be made thinner, while ensuring the reliability of top contact with the conductive site of the PCB.

[0015] Additional aspects and advantages of the present application will be given in subsequent parts and will be understood in detail from the subsequent description or learned through the specific implementation of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the planar structure of a clamping device for PCB electrical performance testing in one embodiment of the utility model;

[0017] Figure 2 This is a schematic diagram of the planar structure of a fixing frame combining block in one embodiment of the utility model;

[0018] Figure 3 It is a plan view of the combined structure of the thread disc and the needle disc in one embodiment of the utility model.

[0019] Description of reference numerals:

[0020] 100-base plate, 200-cable reel, 300-needle reel, 400-cable block fixing bracket;

[0021] 410-fixed frame joint block. DETAILED DESCRIPTION

[0022] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively with reference to the relevant drawings below. Possible embodiments of the utility model are given in the drawings. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein by the drawings. The embodiments described with reference to the drawings are exemplary and are used to make the understanding of the disclosure of the utility model more thorough and comprehensive, and cannot be interpreted as a limitation of the utility model. In addition, if the detailed description of the known technology is non-essential technology for the features of the utility model shown, these technical details may be omitted.

[0023] Those skilled in the relevant art will understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of ordinary technicians in the field to which the utility model belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as here.

[0024] It will be understood by those skilled in the art that, unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present application refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that the term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0025] The technical solution of the present invention and how the technical solution solves the above-mentioned technical problems are described in detail below with specific embodiments.

[0026] The clamping device for PCB electrical performance testing provided in the utility model application includes a base plate 100, a wire reel 200, a needle reel 300 and a harness block fixing frame 400; the wire reel 200, the needle reel 300 and the harness block fixing frame 400 are all arranged on the base plate 100, and the harness block fixing frame 400 is called a BLOCK fixing frame in the industry, and a test harness collection for a certain model of PCB is arranged inside.

[0027] The harness block fixing frame 400 includes a mounting frame, a mounting frame cover plate and a plurality of fixing frame pillars. The mounting frame cover plate is connected to the mounting frame through the fixing frame pillars. One side edge of the mounting frame extends into the bottom plate 100 and is connected to the bottom plate 100 through a plurality of connecting blocks; the needle disk 300 is stacked on the wire disk 200, and the wire disk 200 is connected to the bottom plate 100 through a plurality of wire disk 200 copper pillars; the needle disk 300 includes a plurality of resin plates stacked at equal intervals and a plurality of needle disk 300 copper pillars. Optionally, in another embodiment of the present application, test pin through holes are provided on the resin plate, and the test pin through holes on two adjacent resin plates correspond to each other one by one. Each resin plate of the needle disk 300 is provided with small holes through which the arch test pin passes. The positions of these small holes correspond to a certain model of PCB to be tested. Different PCBs have different layouts of the needle disk 300.

[0028] The base plate 100 and the harness block fixing frame 400 are connected, and the four parts are assembled together through screws, wire reel copper columns, needle and wire reel combining columns, needle reel copper columns and needle reel layered washers to form a PCB clamping device used in conjunction with a testing machine.

[0029] The clamping device for PCB electrical performance testing provided by the utility model effectively solves the problems of mismatch between the test fixture and the machine and low coverage of PCB line resistance test. By redesigning the connection structure, the heavier wiring harness block fixing frame 400 can be more stably connected to the base plate 100, the service life of the equipment is longer, and the reliability is higher. Through several layers of resin boards, the test needle can be made thinner, while ensuring the reliability of top contact with the conductive site of the PCB.

[0030] Optionally, in one embodiment of the present application, Figure 1 and Figure 2 As shown, at least three groups of hollow grooves are provided at one side edge of the mounting frame, each group of hollow grooves includes a first hollow groove and a second hollow groove, and a fixing frame combining block 410 is provided at each group of hollow grooves, and both ends of the fixing frame combining block 410 pass through the first hollow groove and the second hollow groove to connect with the bottom plate 100. Specifically, in a certain implementation of this embodiment, as Figure 2 As shown, the fixing frame combining block 410 includes a transverse plate and protrusions respectively arranged at two ends of the transverse plate, and the protrusions are provided with through holes.

[0031] The harness block fixing frame 400 includes a mounting frame, a mounting frame cover, a fixing frame support, M3*8mm screws, etc. Drill holes at corresponding positions on the mounting frame and the mounting frame cover, place the fixing frame support in the middle of the mounting frame and the mounting frame cover, and fix the two ends with M3*8mm screws to assemble the harness block fixing frame 400. The bottom plate 100 and the harness block fixing frame 400 are assembled together through the fixing frame combining block 410 and M4*20mm screws.

[0032] The specific structure of the wire drum, in a certain embodiment, the total height of the wire drum is 13.5mm, and it is composed of four 3.0mm, one 1mm, and one 0.5mm resin boards, the material is usually FR4, named BX1, BX2, BX3, BX4, among which BX4 is the spring wire layer. Drill holes with a diameter of 3.175mm at the same position of the four corners of each layer, and use 3.175*15mm PIN to assemble each layer in the order of BX1, BX2, BX3, BX4. Add copper column holes to the wire drum, use the wire drum copper column, bottom plate copper column holes, M4*15mm and M4*20mm screws, etc., to assemble the components into a combination of bottom plate + wiring harness block fixing frame + wire drum.

[0033] Optionally, in another embodiment of the present application, Figure 3 As shown, the test pin through holes on two adjacent resin boards are arranged with a preset spacing. In order to illustrate the direction of the test pins, and there are many test pins, Figure 3 The figure only shows the direction of two test pins, which does not mean that there are only two test pins on the pin board. By staggering the preset spacing and corresponding to each other, some test pins can be tilted, for example Figure 3 Z1 in the embodiment avoids the short circuit caused by the dense test pins being gathered together at the end. Similarly, optionally, in another embodiment, Figure 3 As shown, the test needle through hole on the resin plate at the top of the needle plate 300 is inclined. The test needle Z2 on the resin plate at the top is inclined, which can also avoid the test needles from being concentrated at the end.

[0034] Combined with the above embodiment, in a specific implementation, the total height of the needle disk is 33.4mm, and it is composed of 9 FR4 boards, named B1 (3.0mm), B1H (0.5mm), B2 (0.5mm), B3 (0.5mm), B4 (0.5mm), B5 (1mm), B6 ​​(1mm), B7 (1mm), BB2 (3.0mm), and copper column holes, alignment holes, support column holes, etc. with the same position but different apertures are drilled in each layer. Use M4*8mm screws and 200 copper columns on the wire disk, start assembly from BB2, and a needle card cotton layer is also attached to BB2. In the order of BB2, B7, B6, B5, B4, B3, B2, B1H, B1, the copper column holes around each layer are separated by white washers, and the needle disk 300 support columns are placed in the middle, covered with the B1 layer, and fixed with M4*8mm screws, and the needle disk 300 is assembled. By combining the needle and wire reel with the column and the needle and wire reel 200 with the column hole, the clamping device for PCB electrical performance testing composed of the base plate + wiring harness block fixing frame + wire reel combination + needle reel is assembled and completed, which can be applied to PCB electrical performance testing machine.

[0035] It will be understood by those skilled in the art that the terms "first" and "second" discussed in this application are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0036] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0038] The above description is only a partial implementation method of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A clamping device for PCB electrical performance testing, characterized in that: It includes a base plate, a wire reel, a needle reel and a wire harness block fixing frame; The harness block fixing frame comprises a mounting frame, a mounting frame cover plate and a plurality of fixing frame pillars, the mounting frame cover plate is connected to the mounting frame through the fixing frame pillars, and a side edge of the mounting frame extends into the bottom plate and is connected to the bottom plate through a plurality of connecting blocks; The needle disk is stacked on the wire disk, and the wire disk is connected to the bottom plate through a plurality of wire disk copper columns; the needle disk comprises a plurality of resin plates stacked at equal intervals and a plurality of needle disk copper columns.

2. The clamping device for PCB electrical performance testing according to claim 1 is characterized in that: At least three groups of hollow grooves are arranged at one side edge of the mounting frame, each group of hollow grooves includes a first hollow groove and a second hollow groove, and a fixing frame combining block is arranged at each group of hollow grooves, and two ends of the fixing frame combining block respectively pass through the first hollow groove and the second hollow groove to be connected to the bottom plate.

3. The clamping device for PCB electrical performance testing according to claim 2 is characterized in that: The fixing frame combining block comprises a transverse plate and protrusions respectively arranged at two ends of the transverse plate, and the protrusions are provided with penetrating through holes.

4. The clamping device for PCB electrical performance testing according to claim 1 is characterized in that: The resin plates are provided with test pin through holes, and the test pin through holes on two adjacent resin plates correspond to each other one by one.

5. The clamping device for PCB electrical performance testing according to claim 4 is characterized in that: The test pin through holes on two adjacent resin plates are arranged with a preset spacing.

6. The clamping device for PCB electrical performance testing according to claim 4 is characterized in that: The hole of the test needle through hole on the resin plate at the top end of the needle disk is inclined.

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