Back drill measuring device for CCD (Charge Coupled Device) processing

Abstract

The utility model discloses a back drill measuring device for CCD (Charge Coupled Device) processing, which comprises a workpiece contact block, the bottom of the workpiece contact block is provided with a guide chute, four sliding bins are arranged in the workpiece contact block, four special-shaped positioning rods are arranged on the inner sides of the sliding bins in a sliding manner, and the guide chute is arranged in the guide chute. The positions of the four special-shaped positioning rods are symmetrical, the bottom ends of the four special-shaped positioning rods are slidably inserted into the inner sides of the guide sliding grooves, reset elastic plastic rings are fixed between the four special-shaped positioning rods and the inner wall of the workpiece contact block, and the bottom ends of positioning pressing rings are slidably inserted into the workpiece contact block. And four extrusion guide plates are detachably mounted on the outer side of the bottom end of the positioning pressing ring. The device is accurately positioned through the four special-shaped positioning rods, then the internal depth of the back drilling hole is accurately measured through the infrared distance measuring sensor, it is guaranteed that a measuring pipeline cannot penetrate through a central hole of the back drilling hole in the measuring process of the back drilling hole, and the accuracy of a detection result is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of back drilling processing, in particular to a back drilling measuring device for CCD processing. Background Art

[0002] Back drilling is also called back drilling process. Back drilling process is a technology that drills holes from the back of the circuit board during the multi-layer PCB manufacturing process. The purpose is to remove the unused part of the through hole to improve signal integrity and reduce interference. This process ensures that the useful copper layer on the circuit board will not be damaged by precisely controlling the depth of the drilling, thereby improving the performance of the circuit board in high-speed signal transmission.

[0003] The advantages of the back drilling process include high precision, high efficiency and reliability. It is widely used in aviation, automobile, electronics and other fields. By precisely controlling the drilling depth and removing unnecessary through-hole parts, the back drilling process significantly improves the performance and reliability of circuit boards in high-speed signal transmission.

[0004] However, after back-drilling the PCB board, the back-drilled holes need to be inspected. Since the middle part of the hole is hollow, the laser measurement can easily pass through the hole, resulting in a certain deviation in the measurement result. Therefore, it does not meet the existing needs. In this regard, we propose a back-drilling measurement device for CCD processing. Utility Model Content

[0005] The utility model aims to provide a back-drilling measurement device for CCD processing, so as to solve the problem that after back-drilling a PCB board, the back-drilled hole needs to be detected, and since the middle part of the hole is hollow, it is easy for laser measurement to pass through the hole, resulting in a certain deviation in the measurement result.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a back drilling measuring device for CCD processing, comprising a workpiece contact block, a guide groove is provided at the bottom of the workpiece contact block, four sliding bins are provided inside the workpiece contact block, four special-shaped positioning rods are slidably installed on the inner side of the sliding bin, the four special-shaped positioning rods are symmetrically positioned and the bottom ends are slidably inserted into the inner side of the guide groove, the four special-shaped positioning rods are fixed to the inner wall of the workpiece contact block due to a reset elastic plastic ring, the bottom end of the positioning pressure ring is slidably inserted into the inside of the workpiece contact block, and four extrusion guide plates are detachably installed on the outside of the bottom end of the positioning pressure ring, the top end of the extrusion guide plate is kept parallel to the upper surface of the workpiece contact block, the bottom end of the extrusion guide plate is inclined at a forty-five degree angle toward the axial direction of the workpiece contact block, and four symmetrically positioned infrared ranging sensors are also installed inside the bottom end of the workpiece contact block.

[0007] Preferably, the outer surface of the bottom end of the positioning pressure ring is provided with four symmetrically distributed clamping grooves, and the top end of the extrusion guide plate is inserted into the inner side of the clamping groove.

[0008] Preferably, the spacing between the infrared ranging sensors that are symmetrical to each other is larger than the diameter of the central through hole of the back-drilled hole.

[0009] Preferably, the guide groove is composed of two mutually perpendicular strip grooves, the middle of the sliding bin is an annular space, and four vertical plane spaces are arranged around the annular space, and the width of the plane space is consistent with the width of the special-shaped positioning rod.

[0010] Preferably, one end of the special-shaped positioning rod is bent downward at 90 degrees and passes through the guide slide groove, and the other end of the special-shaped positioning rod is bent upward in a U shape and is slidably engaged with the inner side of the sliding bin.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. The utility model presses the positioning pressure ring into the inside of the workpiece contact block, so that the positioning pressure ring drives the extrusion guide plate to push the special-shaped positioning rod, so that the four special-shaped positioning rods are separated from each other and contact the inner wall of the back-drilled hole, so that the axis of the workpiece contact block coincides with the axis of the back-drilled hole, and the device is accurately positioned. After the special-shaped positioning rod moves, the blocked infrared distance sensor is exposed. At this time, the infrared rays directly emitted by the infrared distance sensor will not irradiate the bottom of the back-drilled hole and will not pass through the back-drilled hole, ensuring that there will be no deviation in the measurement of the back-drilled hole and the accuracy of the detection result is guaranteed;

[0013] 2. The utility model fixes a reset elastic plastic ring between the special-shaped positioning rod and the workpiece contact block. After the measurement is completed, the reset elastic plastic ring elastically recovers and drives the special-shaped positioning rod to reset, so that the positioning pressure ring is ejected from the workpiece contact block, ensuring that the device returns to its original state, making it convenient for the device to be used again. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 This is a structural cross-sectional view of the workpiece contact block of the utility model;

[0016] Figure 3 It is a bottom view of the workpiece contact block of the utility model;

[0017] Figure 4 for Figure 2 A magnified view of the structure at center.

[0018] In the figure: 1. workpiece contact block; 2. positioning pressure ring; 3. extrusion guide plate; 4. guide slide groove; 5. special-shaped positioning rod; 6. reset elastic plastic ring; 7. sliding bin; 8. snap-in groove; 9. infrared ranging sensor. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0020] like Figures 1 to 4 As shown, a back drilling measuring device for CCD processing, a guide slot 4 is provided at the bottom of the workpiece contact block 1, four sliding bins 7 are provided inside the workpiece contact block 1, four special-shaped positioning rods 5 are slidably installed on the inner side of the sliding bin 7, the four special-shaped positioning rods 5 are symmetrically positioned and the bottom ends are slidably inserted in the inner side of the guide slot 4, the four special-shaped positioning rods 5 are fixed to the inner wall of the workpiece contact block 1 by a reset elastic plastic ring 6, the bottom end of the positioning pressure ring 2 is slidably inserted in the workpiece contact block 1, and four extrusion guide plates 3 are detachably installed on the outer side of the bottom end of the positioning pressure ring 2 The top end of the extrusion guide plate 3 is kept parallel to the upper surface of the workpiece contact block 1, and the bottom end of the extrusion guide plate 3 is inclined at a forty-five degree angle toward the axis direction of the workpiece contact block 1. Four symmetrically positioned infrared ranging sensors 9 are also installed inside the bottom end of the workpiece contact block 1. The positioning pressure ring 2 is squeezed into the workpiece contact block 1, so that the positioning pressure ring 2 drives the extrusion guide plate 3 to push the special-shaped positioning rod 5, so that the four special-shaped positioning rods 5 are separated from each other and contact the inner wall of the back-drilled hole, so that the axis of the workpiece contact block 1 coincides with the axis of the back-drilled hole, thereby realizing the precise positioning of the device.

[0021] The outer surface of the bottom end of the positioning pressure ring 2 is provided with four symmetrically distributed clamping grooves 8, and the top end of the extrusion guide plate 3 is inserted into the inner side of the clamping groove 8 to ensure that when the positioning pressure ring 2 moves downward, the extrusion guide plate 3 is driven to move downward at the same time. At the same time, the extrusion guide plate 3 is used to ensure that the positioning pressure ring 2 will not fall from the inside of the workpiece contact block 1.

[0022] The guide slot 4 is composed of two mutually perpendicular strip slots. The middle of the sliding bin 7 is an annular space. Four vertical plane spaces are arranged around the annular space. The width of the plane space is consistent with the width of the special-shaped positioning rod 5. One end of the special-shaped positioning rod 5 is bent downward at ninety degrees and passes through the guide slot 4. The other end of the special-shaped positioning rod 5 is bent upward in a U shape and slidably connected to the inner side of the sliding bin 7 to ensure that the special-shaped positioning rod 5 slides along the guide slot 4 in the plane when squeezed, and the special-shaped positioning rod 5 will not tilt or fall inside the sliding bin 7.

[0023] The spacing between the infrared ranging sensors 9 that are symmetrical to each other is larger than the diameter of the central through hole of the back-drilled hole, ensuring that the infrared ranging sensor 9 measures the internal depth of the back-drilled hole and that the measuring infrared rays emitted by the infrared ranging sensor 9 do not pass through the central through hole of the back-drilled hole.

[0024] Working principle: First, insert the ends of the four special-shaped positioning rods 5 through the guide slots 4 and insert them into the inner side of the back-drilled hole, then place the workpiece contact block 1 on the workpiece surface, and slowly squeeze the positioning pressure ring 2 downward. When the positioning pressure ring 2 moves downward, it drives the extrusion guide plate 3 to move downward. At this time, the extrusion guide plate 3 contacts the ends of the special-shaped positioning rods 5 located in the sliding bin 7 and pushes the sliding bin 7 to slide inside the special-shaped positioning rods 5. At this time, the four special-shaped positioning rods 5 move away from each other and approach the inner wall of the workpiece contact block 1. The moving special-shaped positioning rods 5 squeeze the reset elastic plastic ring 6 to make the reset elastic plastic ring 6 elastically deformed. Until the ends of the four special-shaped positioning rods 5 pass through the guide slots 4 and contact the inner wall of the back-drilled hole. After the ends of the special-shaped positioning rods 5 contact the inner wall of the back-drilled hole, continue to move the positioning pressure ring 2 downward. At this time, since the special-shaped positioning rods 5 are restricted by the inner wall of the back-drilled hole, the workpiece contact block 1 slides on the surface of the workpiece until the ends of the four special-shaped positioning rods 5 contact the back-drilled hole. At this time, the axis of the workpiece contact block 1 coincides with the axis of the back-drilled hole and the infrared ranging sensor 9 is exposed. Turn on the power of the infrared ranging sensor 9 and detect the internal depth of the back-drilled hole to ensure that there will be no deviation in the measurement of the back-drilled hole and the accuracy of the detection result.

[0025] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A back drilling measurement device for CCD processing, comprising a workpiece contact block (1), characterized in that: The bottom of the workpiece contact block (1) is provided with a guide groove (4), and the interior of the workpiece contact block (1) is provided with four sliding bins (7). Four special-shaped positioning rods (5) are slidably installed on the inner side of the sliding bin (7). The four special-shaped positioning rods (5) are symmetrically positioned and the bottom ends are slidably inserted into the inner side of the guide groove (4). The four special-shaped positioning rods (5) are fixed to the inner wall of the workpiece contact block (1) by a reset elastic plastic ring (6). The bottom end of the positioning pressure ring (2) is slidably inserted into the interior of the workpiece contact block (1), and four extrusion guide plates (3) are detachably installed on the outer side of the bottom end of the positioning pressure ring (2). The top end of the extrusion guide plate (3) is parallel to the upper surface of the workpiece contact block (1), and the bottom end of the extrusion guide plate (3) is inclined at a forty-five degree angle toward the axial direction of the workpiece contact block (1). Four symmetrically positioned infrared ranging sensors (9) are also installed inside the bottom end of the workpiece contact block (1).

2. The back drilling measurement device for CCD processing according to claim 1, characterized in that: The outer surface of the bottom end of the positioning pressure ring (2) is provided with four symmetrically distributed clamping grooves (8), and the top end of the extrusion guide plate (3) is inserted into the inner side of the clamping groove (8).

3. The back drilling measurement device for CCD processing according to claim 1, characterized in that: The spacing between the infrared distance measuring sensors (9) which are symmetrical to each other is greater than the diameter of the central through hole of the back-drilled hole.

4. The back drilling measurement device for CCD processing according to claim 1, characterized in that: The guide slot (4) is composed of two mutually perpendicular strip slots, the middle of the sliding bin (7) is an annular space, and four vertical plane spaces are arranged around the annular space, and the width of the plane space is consistent with the width of the special-shaped positioning rod (5).

5. The back drilling measurement device for CCD processing according to claim 4, characterized in that: One end of the special-shaped positioning rod (5) is bent downward at 90 degrees and passes through the guide slot (4), and the other end of the special-shaped positioning rod (5) is bent upward in a U-shape and is slidably engaged with the inner side of the sliding bin (7).

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