Circuit board pin height detection tool and circuit board pin height detection equipment

Abstract

The application provides a circuit board pin height detection tool and a circuit board pin height detection device, and belongs to the technical field of circuit board pin detection. The device comprises a detection beam and two groups of adjusting supports. The detection beam penetrates through the two groups of adjusting supports, and the adjusting supports can move along the long axis direction of the detection beam. The opposite sides of the adjusting supports are provided with transverse support rollers, which rollingly cooperate with the circumferential wall surface of the circuit board to be detected. The adjusting supports are also provided with vertical support rollers, which can rollingly cooperate with the base surface perpendicular to the up-down direction to limit the displacement of the adjusting supports in the up-down direction. The application realizes the comprehensive optimization goals of structure simplification, compact layout, weight reduction and cost control while improving the detection accuracy, reliability and operation flexibility.

Description

Technical Field

[0001] This application belongs to the field of circuit board pin detection technology, and more specifically, relates to a circuit board pin height detection fixture and circuit board pin height detection equipment. Background Technology

[0002] After components are soldered and assembled onto a circuit board, if the protruding leads are too long, they may bend and come into contact with adjacent traces or components during vibration, transportation, or subsequent assembly, causing a fatal short circuit and burning out the circuit. Excessively long leads can also press against the housing, heatsink, or adjacent boards, preventing the circuit board from being installed, causing deformation after installation, or creating stress. Trimming ensures that the creepage distance between leads meets safety standards and keeps the back of the circuit board flat for easy connection to external brackets.

[0003] There are some existing fixtures used to detect the protrusion height of pins. Their main working principle is as follows: the height limiting beam, which is slidably connected to the base, slides back and forth. If the protrusion height of the pin is too large, the height limiting beam will be stuck and cannot move further. At this time, the inspector can check the position of the pin that needs to be trimmed, and after confirmation, the trimming operation can be carried out.

[0004] These testing fixtures are often large in size, have poor flexibility in use, and the limiting beam is prone to deformation due to sinking in the middle, which can lead to inaccurate test results and ultimately affect the reliability of the fixtures. Utility Model Content

[0005] The purpose of this application is to provide a circuit board pin height detection fixture and circuit board pin height detection equipment, which aims to solve the problems that the existing fixtures used to detect the protrusion height of pins are large in size and the detection reliability is difficult to guarantee.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: In a first aspect, embodiments of this application provide a circuit board pin height detection fixture, comprising: The detection beam and two sets of adjusting brackets are provided. The detection beam passes through the two sets of adjusting brackets respectively, and the adjusting brackets can move along the long axis of the detection beam. The adjustment bracket is provided with a transverse support roller on the opposite side, and the transverse support roller rolls in cooperation with the circumferential wall of the circuit board to be tested. The adjusting bracket is also provided with a vertical support roller, which can roll in cooperation with the base surface perpendicular to the vertical direction to limit the displacement of the adjusting bracket in the vertical direction.

[0007] Existing fixtures for detecting the extension height of pins often have a large base with a receiving groove for accommodating the circuit board. The bottom of the receiving groove has a padding structure to support the circuit board. There are slides on opposite sides of the receiving groove. The two ends of the height limiting beam are connected to the slides on the corresponding sides. The height limiting beam can slide along the extension direction of the receiving groove, but cannot perform other dimensional movements.

[0008] To accommodate the testing of circuit boards of different sizes, the following design considerations are often employed: First, the receiving slot is larger, the distance between the side slides is greater, and the span of the height-limiting beam is larger, resulting in increased material usage, weight, and space occupation for the base and height-limiting beam. Second, since the height-limiting beam lacks the ability to be adjusted along its height, if testing circuit boards of different thicknesses is required, it is necessary to add or remove padding structures at the bottom of the receiving slot to adjust the distance between the upper side of the circuit board and the height-limiting beam. This process is complex and affects the flexibility of the tooling.

[0009] Furthermore, due to the large span of the height-limiting beam, only both ends are supported, resulting in the greatest bending moment and stress at the mid-span. Under long-term gravitational loads, the mid-span of the height-limiting beam will experience irreversible deflection, i.e., downward bending deformation. If the deflection is significant, even if the pins extending from the middle of the circuit board are within the permitted height, the deflection of the height-limiting beam may cause these pins to obstruct the movement of the beam, leading to inaccurate test results. Inspectors may then perform unnecessary trimming operations based on this.

[0010] The solution described in this application, compared with the prior art, involves placing the circuit board to be tested in a designated position. The distance between two adjusting brackets is adjusted according to the width of the circuit board, allowing the lateral support rollers on the two adjusting brackets to roll into contact with the corresponding circumferential wall surface of the circuit board, thereby limiting the displacement of the adjusting brackets and the detection beam in the width direction of the circuit board. Simultaneously, the vertical support rollers on each adjusting bracket roll into contact with the base surface perpendicular to the vertical direction, further limiting the displacement of the adjusting brackets and the detection beam in the vertical direction. The overall structure formed by the two sets of adjusting brackets and the detection beam can only move along the side edge of the circuit board, thus enabling the detection of the pin extension height of the circuit board using the detection beam.

[0011] The circuit board pin height detection fixture of this application has the following advantages: Firstly, by designing the detection beam as a connecting element between two independently movable adjustable supports, the spacing between the two sets of supports can be infinitely adjusted according to the actual width of the circuit board under test. Regardless of the circuit board's width, the adjustable supports can be moved to its side for support. This eliminates the need to manufacture a bulky base with deep grooves and an extra-long fixed slide, as well as a matching extra-long, heavy-duty beam. The detection beam and adjustable supports can be optimized for common circuit board sizes, significantly reducing material usage and consequently lowering machining and manufacturing costs. This results in overall tooling lightweighting, a significantly reduced tooling volume, and easier storage, handling, and use on compact workbenches.

[0012] Secondly, the base surface is located outside the coverage area of ​​the circuit board, and there is no direct connection between the adjustment bracket and the base surface. When inspecting circuit boards of different thicknesses, different types of circuit board pin height inspection fixtures can be used, or the height of the base surface can be finely adjusted, without having to repeatedly add, remove, or replace pads at the bottom of the receiving slot as with traditional fixtures. This effectively simplifies the operation process, improves inspection efficiency and the ability to respond quickly to different products, and enhances the flexibility of use.

[0013] Thirdly, traditional height-limiting beams are simply supported beam structures with supports at both ends, resulting in the largest bending moment at mid-span and a tendency to deflect. The detection beam in this application is supported by two movable adjustable brackets. During testing, the adjustable brackets are not fixed at the far end but are directly supported near the two edges of the circuit board. For any size circuit board, the effective support span of the detection beam is always approximately equal to the width of the circuit board, rather than the maximum width of the fixture itself, achieving board-based support and shortening the lever arm. This avoids the mid-span deflection problem caused by creep of the beam material under long-term self-weight and slight external forces. The detection benchmark (lower edge height of the beam) remains stable and consistent throughout the entire beam length, ensuring the accuracy and long-term reliability of the test results and avoiding misjudgments due to beam deformation itself.

[0014] Fourth, the rolling friction contact between the adjustment bracket and the circuit board reduces resistance when the tooling is moved along the length of the circuit board, making the movement of the entire testing device above the circuit board more stable and convenient. This reduces testing errors and operational inconvenience caused by jamming and jumping, while effectively avoiding the risk of scratching the edge of the circuit board or the printed circuit during the testing process.

[0015] In summary, this application achieves tooling adaptability to circuit board dimensions through an adjustable-spacing support structure, enables height adjustment of the detection beam through a support method combined with an independent base surface, avoids beam deflection through the mechanical principle of board-mounted support, and improves operational experience and safety through rolling friction design. While enhancing detection accuracy, reliability, and operational flexibility, it achieves a comprehensive optimization goal of structural simplification, compact layout, weight reduction, and cost control.

[0016] In conjunction with the first aspect, in one possible implementation, the bottom of the adjustment bracket forms an adapter notch, the adapter notch having a first adapter surface parallel to the vertical direction and a second adapter surface perpendicular to the vertical direction, the adapter notch being used to accommodate the edge portion of the circuit board to be tested; The axis of rotation of the lateral support roller is parallel to the vertical direction, and its rolling mating surface protrudes from the first adapter surface. The vertical support roller has its axis of rotation perpendicular to the up and down direction, and its rolling contact surface protrudes downward from the second adapter surface. The upper surface of the circuit board to be tested forms the base surface, and the vertical support roller rolls in contact with the upper surface of the circuit board to be tested.

[0017] In conjunction with the first aspect, in one possible implementation, the adjusting bracket has a through channel in the middle, the detection beam passes through the through channel, and the height of the through channel is greater than the thickness of the detection beam; The circuit board pin height detection fixture also includes an adjustment shim, which is placed in the through channel and positioned above or below the detection beam to adjust the height of the detection beam in the through channel.

[0018] In some embodiments, the upper part of the adjusting bracket is movably provided with a locking member, the lower end of which extends downward into the through channel and can apply downward pressure to the top of the detection beam to lock the height of the detection beam.

[0019] In some embodiments, the upper part of the adjusting bracket is provided with an adjusting screw hole communicating with the through channel, and the locking member includes an adjusting screw and an adjusting handle provided at the upper end of the adjusting screw; the adjusting screw is screwed to the adjusting screw hole, and the lower end of the adjusting screw can apply downward pressure to the top of the detection beam.

[0020] In some embodiments, the upper and lower surfaces of the detection beam are both planes perpendicular to the vertical direction, and the top and bottom walls of the through channel are both planes perpendicular to the vertical direction.

[0021] In some embodiments, buffer grooves are provided between the top and side walls of the through channel, and between the bottom and side walls of the through channel, and the buffer grooves are arc-shaped grooves.

[0022] In conjunction with the first aspect, in one possible implementation, the adjusting bracket has a transverse mounting groove having a downwardly opening transverse assembly opening and a transverse rolling adaptation opening located on the opposite side of the adjusting bracket. The lateral support roller is installed in the lateral mounting groove, and part of the lateral support roller extends out of the lateral rolling adapter opening.

[0023] In conjunction with the first aspect, in one possible implementation, the adjusting bracket has a vertical mounting groove with a vertical assembly opening on the opposite side of the adjusting bracket, and also has a downward-facing vertical rolling adapter opening. The vertical support roller is installed in the vertical mounting groove, and part of the vertical support roller extends out of the vertical rolling adapter opening.

[0024] Secondly, embodiments of this application also provide a circuit board pin height detection device, including a support bracket and the aforementioned circuit board pin height detection fixture, wherein the support bracket is used to support the circuit board to be tested.

[0025] Compared with the prior art, the solution shown in this application, by adopting the above-mentioned circuit board pin height detection equipment, achieves the comprehensive optimization goals of structural simplification, compact layout, weight reduction and cost control while improving detection accuracy, reliability and operational flexibility. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the circuit board pin height detection fixture provided in Embodiment 1 of this application; Figure 2 for Figure 1 A schematic diagram of the assembly of the adjustment bracket and the detection beam on the left side; Figure 3 This is a view from direction A of the adjustment bracket used in Embodiment 1 of this application; Figure 4 for Figure 3 A bottom view; Figure 5for Figure 3 Top view; Figure 6 for Figure 3 Side view; Figure 7 This is a schematic diagram of the assembly of the adjusting bracket, adjusting shims, and detection beam used in Embodiment 2 of this application. Figure 1 ; Figure 8 This is a schematic diagram of the assembly of the adjusting bracket, adjusting shims, and detection beam used in Embodiment 2 of this application. Figure 2 .

[0028] In the diagram: 100, detection beam; 200, adjusting bracket; 201, adapter notch; 202, first adapter surface; 203, second adapter surface; 204, through channel; 205, buffer groove; 206, adjusting screw hole; 207, horizontal mounting groove; 208, vertical mounting groove; 210, horizontal limit stop; 220, horizontal mounting fastener; 230, vertical limit stop; 240, vertical mounting fastener; 300, horizontal support roller; 310, horizontal support wheel axle; 400, vertical support roller; 410, vertical support wheel axle; 500, adjusting shim; 600, locking component; 610, adjusting handle; 700, circuit board. Detailed Implementation

[0029] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0030] It should be noted that when an element is referred to as being "set on" another element, it can be directly on or indirectly on that other element. It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a few" means two or more, unless otherwise explicitly specified.

[0032] Existing fixtures for detecting the extension height of pins often have a large base with a receiving groove for accommodating the circuit board. The bottom of the receiving groove has a padding structure to support the circuit board. There are slides on opposite sides of the receiving groove. The two ends of the height limiting beam are connected to the slides on the corresponding sides. The height limiting beam can slide along the extension direction of the receiving groove, but cannot perform other dimensional movements.

[0033] To accommodate the testing of circuit boards of different sizes, the following design considerations are often employed: First, the receiving slot is larger, the distance between the side slides is greater, and the span of the height-limiting beam is larger, resulting in increased material usage, weight, and space occupation for the base and height-limiting beam. Second, since the height-limiting beam lacks the ability to be adjusted along its height, if testing circuit boards of different thicknesses is required, it is necessary to add or remove padding structures at the bottom of the receiving slot to adjust the distance between the upper side of the circuit board and the height-limiting beam. This process is complex and affects the flexibility of the tooling.

[0034] Furthermore, due to the large span of the height-limiting beam, only both ends are supported, resulting in the greatest bending moment and stress at the mid-span. Under long-term gravitational loads, the mid-span of the height-limiting beam will experience irreversible deflection, i.e., downward bending deformation. If the deflection is significant, even if the pins extending from the middle of the circuit board are within the permitted height, the deflection of the height-limiting beam may cause these pins to obstruct the movement of the beam, leading to inaccurate test results. Inspectors may then perform unnecessary trimming operations based on this.

[0035] To resolve the above issues, please refer to the following: Figures 1 to 8 The circuit board pin height detection fixture provided in this application is described below. The circuit board pin height detection fixture includes a detection beam 100 and two sets of adjusting brackets 200. The detection beam 100 passes through the two sets of adjusting brackets 200, and the adjusting brackets 200 can move along the long axis of the detection beam 100. A transverse support roller 300 is provided on the opposite side of the adjusting bracket 200, and the transverse support roller 300 rolls in engagement with the circumferential wall surface of the circuit board 700 to be tested. A vertical support roller 400 is also provided on the adjusting bracket 200, and the vertical support roller 400 rolls in engagement with a base surface perpendicular to the vertical direction to limit the displacement of the adjusting bracket 200 in the vertical direction. Here, "opposite side of the adjusting bracket 200" refers to the opposite sides of the two adjusting brackets 200.

[0036] In use, the circuit board 700 to be tested is inverted so that the pins are exposed upwards. After the circuit board 700 is placed in the designated position, the distance between the two adjusting brackets 200 is adjusted according to the width of the circuit board 700, so that the lateral support rollers 300 on the two adjusting brackets 200 can roll into contact with the circumferential wall surface of the corresponding side of the circuit board 700, thereby limiting the displacement of the adjusting brackets 200 and the detection beam 100 in the width direction of the circuit board 700. At the same time, the vertical support rollers 400 on each adjusting bracket 200 roll into contact with the base surface perpendicular to the vertical direction, thereby limiting the displacement of the adjusting brackets 200 and the detection beam 100 in the vertical direction. The overall structure formed by the two sets of adjusting brackets 200 and the detection beam 100 can only move along the side edge of the circuit board 700, thereby using the detection beam 100 to detect the protrusion height of the circuit board pins.

[0037] In this embodiment, the base surface can be the platform supporting the bracket or other planes, and is not limited to any one of them.

[0038] The circuit board pin height detection fixture provided in this application has the following advantages compared with the prior art: Firstly, by designing the detection beam 100 to run through two sets of independently movable adjustable supports 200, the spacing between the two sets of supports can be steplessly adjusted according to the actual width of the circuit board 700 under test. Regardless of the width of the circuit board 700, the adjustable supports 200 can be moved to its side for support. This eliminates the need to manufacture a bulky base with deep grooves and an extra-long fixed slide, as well as a matching extra-long, heavy-duty beam. The detection beam 100 and the adjustable supports 200 can be optimized for common circuit board 700 dimensions, significantly reducing material usage and consequently lowering machining and manufacturing costs. This achieves overall lightweighting of the tooling, significantly reducing its size and facilitating storage, handling, and use on compact workbenches.

[0039] Secondly, the base surface is located outside the coverage area of ​​the circuit board 700, and there is no direct connection between the adjusting bracket 200 and the base surface. When inspecting circuit boards 700 of different thicknesses, different models of circuit board pin height inspection fixtures can be replaced, or the height of the base surface can be finely adjusted, without having to repeatedly add, remove, or replace pads at the bottom of the receiving slot as with traditional fixtures. This effectively simplifies the operation process, improves inspection efficiency and the ability to respond quickly to different products, and enhances the flexibility of use.

[0040] Thirdly, traditional height-limiting beams are simply supported beam structures with supports at both ends, resulting in the largest bending moment at mid-span and a tendency to deflect. The detection beam 100 of this application is supported by two movable adjustable supports 200. During testing, the adjustable supports 200 are not fixed at the far end, but are directly supported near the two edges of the circuit board 700. For any size circuit board 700, the effective support span of the detection beam 100 is always approximately equal to the width of the circuit board 700, rather than the maximum width of the fixture itself, achieving board-based support and shortening the lever arm. This avoids the problem of mid-span deflection caused by creep of the beam material under long-term self-weight and slight external forces. The detection benchmark (lower edge height of the beam) remains stable and consistent throughout the entire beam length, ensuring the accuracy and long-term reliability of the test results and avoiding misjudgments due to beam deformation itself.

[0041] Fourth, the rolling friction contact between the adjustment bracket 200 and the circuit board 700 reduces resistance when the tooling is moved along the length of the circuit board 700, making the movement of the entire testing device above the circuit board 700 more stable and convenient. This reduces testing errors and operational inconvenience caused by jamming and jumping, and effectively avoids the risk of scratching the edge of the circuit board 700 or the printed circuit during the testing process.

[0042] In summary, this application achieves self-adaptation of the tooling to the 700-inch size of the circuit board through an adjustable-spacing support structure, adjusts the height of the detection beam 100 through a support method combined with an independent base surface, avoids the problem of beam 100 deflection by utilizing the mechanical principle of board-mounted support, and improves the user experience and safety through a rolling friction design. While improving detection accuracy, reliability, and operational flexibility, it achieves a comprehensive optimization goal of structural simplification, compact layout, weight reduction, and cost control.

[0043] In some embodiments, to reduce weight while meeting structural strength requirements, both the detection beam 100 and the adjusting bracket 200 are aluminum alloy components. The adjusting bracket 200 is a block-shaped bracket to improve the overall structural strength of the adjusting bracket 200.

[0044] In some embodiments, see Figures 1 to 4 , Figures 6 to 8The bottom of the adjusting bracket 200 forms an adapter notch 201, which has a first adapter surface 202 parallel to the vertical direction and a second adapter surface 203 perpendicular to the vertical direction. The adapter notch 201 is used to accommodate the edge of the circuit board 700 to be tested. The axis of rotation of the horizontal support roller 300 is parallel to the vertical direction, and its rolling contact surface protrudes from the first adapter surface 202. The axis of rotation of the vertical support roller 400 is perpendicular to the vertical direction, and its rolling contact surface protrudes downward from the second adapter surface 203. The upper surface of the circuit board 700 to be tested forms a base surface, and the vertical support roller 400 rolls in contact with the upper surface of the circuit board 700 to be tested.

[0045] In this embodiment, the upper surface of the circuit board 700 to be tested is defined as the base surface that contacts the vertical support roller 400. The circuit board 700 not only serves as the object being tested, but also plays a crucial role in providing a reference and guidance for the testing device. Based on this, the independent and bulky base and pad structure in traditional tooling is eliminated, and there is no need to prepare an additional testing platform for the vertical support roller 400, thus achieving a high degree of integration and extreme simplification of the testing system.

[0046] The reference height for detection (i.e., the standard for determining whether a pin is too high) is determined by the relative distance between the lower edge of the detection beam 100 and the upper surface of the circuit board 700 itself. Since the vertical rollers roll directly on the surface of the circuit board 700, the positioning reference of the entire detection fixture in the height direction always follows the actual surface of the circuit board 700, rather than the surface of any external independent platform. This eliminates secondary errors introduced by base flatness, uneven pad thickness, or errors from additional reference platforms.

[0047] Furthermore, the adapter notch 201 enables wrap-around positioning of the edge of the circuit board 700. The first adapter surface 202, in conjunction with the lateral support roller 300, laterally limits the position of the circuit board 700, while the second adapter surface 203 provides a reference point for the operation of the vertical support roller 400. This allows the adjusting bracket 200 to precisely engage with the edge of the circuit board 700, forming an adaptive clamping and support system.

[0048] In some embodiments, see Figure 7 and Figure 8The adjusting bracket 200 has a through channel 204 in the middle, through which the detection beam 100 passes. The height of the through channel 204 is greater than the thickness of the detection beam 100. The circuit board pin height detection fixture also includes an adjusting shim 500, which is placed in the through channel 204 and positioned above or below the detection beam 100 to adjust the height of the detection beam 100 within the through channel 204. When the position of the adjusting bracket 200 needs to be adjusted, the adjusting shim 500 can be removed from the through channel 204 first, and then reinserted after the position of the adjusting bracket 200 has been adjusted. Figure 7 and Figure 8 The dotted line in the diagram represents the upper surface of the circuit board 700, meaning that when the adapter notch 201 is provided, the upper surface of the circuit board 700 is used as the base surface.

[0049] Figure 7 In the middle, the adjusting shim 500 is set above the detection beam 100, and the detection elevation (i.e. the standard height of the pin extension) is the height from the bottom surface of the detection beam 100 to the base surface in this state, which is defined as H1. Figure 8 In this configuration, the adjusting shim 500 is positioned below the detection beam 100. The detection elevation is the height from the bottom surface of the detection beam 100 to the base surface in this state, defined as H2. Clearly, H2 is greater than H1, thus achieving adaptation to two different detection elevations and meeting the detection requirements with different pin extension heights, providing greater flexibility in use.

[0050] It should be understood that the number and thickness of the adjusting shims 500 are not limited to the embodiment shown in the attached drawings. For example, if two adjusting shims 500 of the same thickness are provided in the same through channel 204, three detection elevations can be adjusted: one detection elevation is achieved when both adjusting shims 500 are stacked above the detection beam 100; another detection elevation is achieved when both adjusting shims 500 are stacked below the detection beam 100; and yet another detection elevation is achieved when the two adjusting shims 500 are respectively located on the upper and lower sides of the detection beam 100. Other examples will not be listed one by one.

[0051] Optionally, the adjusting shim 500 is a rigid component and can be made of materials such as aluminum alloy or stainless steel.

[0052] Based on the above embodiments, see Figure 1 and Figure 2The upper part of the adjusting bracket 200 is movably equipped with a locking member 600. The lower end of the locking member 600 extends downward into the through channel 204 and can apply downward pressure to the top of the detection beam 100 to lock the height of the detection beam 100. When it is necessary to adjust the position of the adjusting bracket 200, first loosen the locking member 600 to release its downward pressure, remove the adjusting shim 500 from the through channel 204, and then adjust the position of the adjusting bracket 200. After the position of the adjusting bracket 200 is adjusted, insert the adjusting shim 500, and finally use the locking member 600 to press down and lock it.

[0053] During the testing process, the detection beam 100 may be subjected to slight lateral forces or vibrations. Relying solely on the adjusting shims 500 may not completely eliminate the slight swaying or sinking of the detection beam 100 within the through channel 204. The active downward clamping force provided by the locking member 600 can eliminate the vertical swaying space between the detection beam 100 and the through channel 204, forming a reliable positioning. This effectively prevents the risk of misjudgment caused by the accidental downward movement of the detection beam 100 during the testing process, ensuring the repeatability and stability of the test.

[0054] In some specific embodiments of the locking element 600, see [reference needed]. Figure 1 , Figure 2 and Figure 5 The upper part of the adjusting bracket 200 is provided with an adjusting screw hole 206 communicating with the through channel 204. The locking member 600 includes an adjusting screw and an adjusting handle 610 located at the upper end of the adjusting screw. The adjusting screw is screwed into the adjusting screw hole 206, and the lower end of the adjusting screw can apply downward pressure to the top of the detection beam 100.

[0055] The adjusting screw and adjusting screw hole 206 have precision transmission characteristics. Rotating the adjusting handle 610 can precisely control the small distance the lower end of the screw moves down, thereby achieving fine adjustment of the clamping force of the detection beam 100. Moreover, the self-locking property of the thread means that once the position is set, the height will automatically lock when there is no external force to rotate, which is very stable and does not require an additional locking structure.

[0056] In some embodiments, see Figure 3 , Figure 7 and Figure 8 The upper and lower surfaces of the detection beam 100 are both planes perpendicular to the vertical direction, and the top and bottom walls of the through channel 204 are both planes perpendicular to the vertical direction.

[0057] When the upper and lower surfaces of the detection beam 100 and the top / bottom walls of the through channel 204 are both precision-machined vertical planes, they have a large contact area. If no adjusting shim 500 is provided between the upper surface of the detection beam 100 and the top wall of the through channel 204 (or the lower surface of the detection beam 100 and the bottom wall of the through channel 204), these two surfaces can fit together completely, stabilizing the position of the detection beam 100 and preventing floating. When the adjusting shim 500 is used, the shim is sandwiched between two parallel planes, and the thickness of the adjusting shim 500 can more accurately transmit the height adjustment of the detection beam 100, avoiding uneven pressure and thickness errors caused by point contact or line contact.

[0058] Optionally, to enhance the structural regularity of the detection beam 100 and the through channel 204 and reduce manufacturing difficulty, the two side walls of the through channel 204 are vertical planes, and the two side surfaces of the detection beam 100 are vertical planes. This makes the through channel 204 rectangular and the cross-section of the detection beam 100 rectangular.

[0059] Based on the above embodiments, see Figures 1 to 3 , Figure 7 and Figure 8 Buffer grooves 205 are provided between the top and side walls of the through channel 204, and between the bottom and side walls of the through channel 204. The buffer grooves 205 are arc-shaped grooves.

[0060] The design of the buffer groove 205 avoids sharp corners between the top and side walls of the through channel 204, and between the bottom and side walls of the through channel 204, thereby eliminating stress concentration in this area. When the locking member 600 presses down on the detection beam 100, the force is transmitted downward along the upper surface of the detection beam 100 to the bottom wall of the through channel 204. If the bottom and side walls of the through channel 204 intersect at a right angle, slight distortion may occur in the pressure transmission at this point. The curved buffer groove 205 provides a small deformation space, allowing the pressure to be transmitted more smoothly to the entire inner wall of the through channel 204, avoiding excessive local stress.

[0061] In some embodiments, see Figures 2 to 4 The adjusting bracket 200 has a transverse mounting groove 207, which has a downward-facing transverse mounting opening and a transverse rolling adaptation opening located on the opposite side of the adjusting bracket 200. A transverse support roller 300 is mounted within the transverse mounting groove 207, with a portion of the roller extending beyond the transverse rolling adaptation opening. With the adaptation notch 201 provided, the transverse rolling adaptation opening is located on the first adaptation surface 202.

[0062] In this embodiment, the transverse mounting groove 207 enables the transverse support roller 300 to be built into the adjusting bracket 200. The transverse mounting opening allows for the insertion and installation of the transverse support roller 300, while the transverse rolling adaptation opening meets the rolling adaptation requirements of the transverse support roller 300. Under normal operating conditions, the transverse support roller 300 is mostly enclosed within the transverse mounting groove 207, which provides some protection against falling dust and other contaminants, reducing the risk of contaminant intrusion leading to jamming or accelerated wear, and improving the long-term reliability and service life of the transverse support roller 300.

[0063] Meanwhile, the transverse mounting groove 207 is used to axially position the transverse support roller 300, restrict the displacement of the transverse support roller 300 along its axial direction, prevent unnecessary axial movement, and ensure that the transverse support roller 300 is always in contact with the side wall of the circuit board 700 within the designed plane.

[0064] In some specific embodiments, see Figure 1 and Figure 2 A lateral limiting block 210 is provided in the lateral mounting groove 207. The lateral limiting block 210 is located at the lateral assembly opening. The lateral mounting fastener 220 passes upward through the lateral limiting block 210 and is screwed to the adjusting bracket 200 to lock the lateral limiting block 210 in the lateral mounting groove 207. After the lateral limiting block 210 is fixed, it cooperates with the bottom wall of the lateral mounting groove 207 to clamp and limit it on both sides of the lateral support roller 300 along the axial direction.

[0065] Optionally, one end of the cross brace axle 310 of the transverse support roller 300 is connected to the bottom wall of the transverse mounting groove 207 to limit the displacement of the transverse support roller 300 in the length direction of the detection beam 100.

[0066] Optionally, the lateral mounting groove 207 is a stepped groove, and the groove depth of its mating area with the lateral limiting block 210 is less than the groove depth of its mating area with the lateral support roller 300.

[0067] In some embodiments, see Figures 2 to 4 The adjusting bracket 200 has a vertical mounting groove 208, which has a vertical mounting opening on the opposite side of the adjusting bracket 200, and also has a downward-facing vertical rolling adapter opening. A vertical support roller 400 is mounted within the vertical mounting groove 208, with a portion of the vertical support roller 400 extending out of the vertical rolling adapter opening. With the adapter notch 201 provided, the vertical rolling adapter opening is located on the second adapter surface 203.

[0068] In this embodiment, the vertical mounting slot 208 enables the vertical support roller 400 to be built into the adjusting bracket 200. The vertical mounting opening allows for the insertion and installation of the vertical support roller 400, while the vertical rolling adaptation opening meets the rolling adaptation requirements of the vertical support roller 400. Under normal operating conditions, the vertical support roller 400 is mostly enclosed within the vertical mounting slot 208, which provides some protection against falling dust and other contaminants, reducing the risk of contaminant intrusion leading to jamming or accelerated wear, and improving the long-term reliability and service life of the vertical support roller 400.

[0069] Meanwhile, the vertical mounting groove 208 is used to axially position the vertical support roller 400, restrict the displacement of the vertical support roller 400 along its axial direction, prevent unnecessary axial movement, and ensure that the vertical support roller 400 is always in contact with the foundation surface within the designed plane.

[0070] In some specific embodiments, see Figure 1 and Figure 2 A vertical limiting block 230 is provided in the vertical mounting groove 208. The vertical limiting block 230 is located at the vertical assembly opening. The vertical mounting fastener 240 passes through the vertical limiting block 230 upward and is screwed to the adjusting bracket 200 to lock the vertical limiting block 230 in the vertical mounting groove 208. After the vertical limiting block 230 is fixed, it cooperates with the bottom wall of the vertical mounting groove 208 to clamp and limit it on both sides of the vertical support roller 400 in the axial direction.

[0071] Optionally, one end of the vertical support roller 400's vertical support wheel shaft 410 is connected to the bottom wall of the vertical mounting groove 208 to limit the displacement of the vertical support roller 400 in the vertical direction.

[0072] Optionally, the vertical mounting groove 208 is a stepped groove, and the groove depth of its mating area with the vertical limit stop 230 is less than the groove depth of its mating area with the vertical support roller 400.

[0073] Based on the same inventive concept, this application also provides a circuit board pin height detection device, including a support bracket and the above-mentioned circuit board pin height detection fixture, wherein the support bracket is used to support the circuit board 700 to be tested.

[0074] Compared with the prior art, the solution shown in this application, by adopting the above-mentioned circuit board pin height detection equipment, achieves the comprehensive optimization goals of structural simplification, compact layout, weight reduction and cost control while improving detection accuracy, reliability and operational flexibility.

[0075] In some specific embodiments of the support bracket, the support bracket includes a chassis and several pillars. The chassis has several support holes, and upwardly protruding pillars are detachably connected to the support holes. The top of the pillars can support a designated area of ​​the circuit board 700 to achieve support and fixation of the circuit board 700. It should be noted that the length of the pillars is not fixed to adapt to the support requirements of different circuit boards 700; the support position of the pillars is not fixed to adapt to the support requirements of different circuit boards 700.

[0076] In some embodiments, the size of the base of the support bracket is larger than the size of the circuit board 700, and the area of ​​the base located on the outer periphery of the circuit board 700 can serve as a base surface. In this case, the adjusting bracket 200 does not have an adaptation notch 201. In other cases, the size of the base of the support bracket is not larger than the size of the circuit board 700, or the size of the base of the support bracket is slightly larger than the size of the circuit board 700, and the area of ​​the base located on the outer periphery of the circuit board 700 is insufficient to form a base surface. In this case, the adjusting bracket 200 has an adaptation notch 201, and the vertical support roller 400 uses the upper surface of the circuit board 700 as its base surface.

[0077] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A circuit board pin height detection fixture, characterized in that, include: The detection beam (100) and two sets of adjusting brackets (200) are provided. The detection beam (100) passes through the two sets of adjusting brackets (200) respectively, and the adjusting brackets (200) can move along the long axis of the detection beam (100). The adjustment bracket (200) is provided with a transverse support roller (300) on the opposite side, and the transverse support roller (300) rolls in cooperation with the circumferential wall of the circuit board (700) to be tested. The adjusting bracket (200) is also provided with a vertical support roller (400), which can roll in cooperation with the base surface perpendicular to the vertical direction to limit the displacement of the adjusting bracket (200) in the vertical direction.

2. The circuit board pin height detection fixture as described in claim 1, characterized in that, The bottom of the adjustment bracket (200) forms an adapter notch (201), the adapter notch (201) has a first adapter surface (202) parallel to the vertical direction and a second adapter surface (203) perpendicular to the vertical direction, the adapter notch (201) is used to accommodate the edge of the circuit board (700) to be tested; The axis of rotation of the lateral support roller (300) is parallel to the vertical direction, and its rolling mating surface protrudes from the first adapter surface (202). The vertical support roller (400) has its axis of rotation perpendicular to the up and down direction, and its rolling contact surface protrudes downward from the second adapter surface (203). The upper surface of the circuit board (700) to be tested forms the base surface, and the vertical support roller (400) rolls in contact with the upper surface of the circuit board (700) to be tested.

3. The circuit board pin height detection fixture as described in claim 1, characterized in that, The adjusting bracket (200) has a through channel (204) in the middle, and the detection beam (100) passes through the through channel (204). The height of the through channel (204) is greater than the thickness of the detection beam (100). The circuit board pin height detection fixture also includes an adjustment shim (500), which is placed in the through channel (204) and positioned above or below the detection beam (100) to adjust the height of the detection beam (100) in the through channel (204).

4. The circuit board pin height detection fixture as described in claim 3, characterized in that, The upper part of the adjusting bracket (200) is movably provided with a locking member (600), the lower end of which extends downward into the through channel (204) and can apply downward pressure to the top of the detection beam (100) to lock the height of the detection beam (100).

5. The circuit board pin height detection fixture as described in claim 4, characterized in that, The upper part of the adjusting bracket (200) is provided with an adjusting screw hole (206) communicating with the through channel (204). The locking member (600) includes an adjusting screw and an adjusting handle (610) provided at the upper end of the adjusting screw. The adjusting screw is screwed to the adjusting screw hole (206), and the lower end of the adjusting screw can apply downward pressure to the top of the detection beam (100).

6. The circuit board pin height detection fixture as described in claim 3, characterized in that, The upper and lower surfaces of the detection beam (100) are both planes perpendicular to the vertical direction, and the top and bottom walls of the through channel (204) are both planes perpendicular to the vertical direction.

7. The circuit board pin height detection fixture as described in claim 6, characterized in that, A buffer groove (205) is provided between the top and side walls of the through channel (204) and between the bottom and side walls of the through channel (204). The buffer groove (205) is an arc-shaped groove.

8. The circuit board pin height detection fixture as described in claim 1, characterized in that, The adjusting bracket (200) has a transverse mounting groove (207), which has a downward-facing transverse assembly opening and a transverse rolling adaptation opening located on the opposite side of the adjusting bracket (200). The lateral support roller (300) is installed in the lateral mounting groove (207), and a portion of the lateral support roller (300) extends out of the lateral rolling adapter opening.

9. The circuit board pin height detection fixture as described in claim 1, characterized in that, The adjusting bracket (200) has a vertical mounting groove (208), the vertical mounting groove (208) has a vertical assembly opening on the opposite side of the adjusting bracket (200), and also has a downward-facing vertical rolling adapter opening; The vertical support roller (400) is installed in the vertical mounting groove (208), and part of the vertical support roller (400) extends out of the vertical rolling adapter opening.

10. A circuit board pin height detection device, characterized in that, Includes a support bracket and a circuit board pin height detection fixture as described in any one of claims 1-9, wherein the support bracket is used to support the circuit board (700) to be tested.

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