A micrometer positioning structure for measuring a heat sink

Abstract

This utility model discloses a dial indicator positioning structure for measuring a heat sink plate. It includes a dial indicator; an adapter is connected to the lower end of the dial indicator, and a positioning block is detachably connected to the adapter. The positioning block has a first stepped through hole, and the adapter has a second stepped through hole communicating with the first stepped through hole. The sleeve of the dial indicator passes through the second stepped through hole. A measuring rod is slidably disposed within the first stepped through hole, abutting against the dial indicator probe. The lower end of the measuring rod extends out of the bottom of the positioning block and contacts the surface of the heat sink plate. The measuring rod has a first limiting part, and a spring abuts against the lower stepped surface of the first stepped through hole. The other end of the spring is connected to the upper end surface of the first limiting part. A second limiting part restricts the movement of the first limiting part at the bottom of the first stepped through hole. The bottom of the positioning block is a horizontally extending block shape with a flat bottom. This utility model can provide a stable positioning reference, enabling rapid clamping during the measurement process and improving convenience.

Description

Technical Field

[0001] This utility model relates to a positioning structure, and more particularly to a dial indicator positioning structure for measuring the flatness of a heat sink, belonging to the field of precision measurement and positioning equipment for heat sink flatness. Background Technology

[0002] The flatness of the bottom surface of a heatsink (such as a CPU cooler base or a power device heatsink) is one of its key performance indicators. Poor flatness leads to insufficient contact with the heat source, creating contact thermal resistance and severely affecting heat dissipation efficiency. Therefore, high-precision flatness testing of the heatsink is necessary during the production process. Currently, the common method involves the operator simply holding a dial indicator and fixing it to the heatsink, using the platform as a reference for measurement. However, this method relies on the operator's experience, has poor stability, and can occasionally introduce measurement errors due to human factors (such as uneven holding angle or force), resulting in low measurement efficiency and difficulty in ensuring consistent reference points for each measurement. Therefore, specialized gauges for measuring the height difference on the surface of circuit boards have begun to appear on the market. For example, Chinese utility model patent CN204085379U discloses a gauge for measuring the height difference on the surface of circuit boards, including a bracket comprising a base, a support rod, an adjusting rod, and a horizontal rod. The support rod is mounted on the base, and one end of the adjusting rod is rotatably connected to the support rod, while the other end is rotatably connected to the horizontal rod. A dial indicator is also included, fixed to the horizontal rod, with its measuring rod perpendicular to the horizontal rod. However, while this device avoids measurement errors caused by human factors to some extent, the measurement process is relatively cumbersome, and there is room for improvement in terms of measurement flexibility and convenience.

[0003] Therefore, existing technologies lack a dedicated tooling that can quickly and conveniently position the dial indicator at the measurement position on the heat sink, and ensure that the measuring head maintains a constant and perpendicular contact force with the measuring surface, thereby improving measurement repeatability and efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a dial indicator positioning structure for measuring heat sinks. This invention provides a stable positioning reference, enabling rapid clamping during the measurement process and improving convenience.

[0005] The technical solution of this utility model is as follows: A dial indicator positioning structure for measuring a heat sink plate, including a dial indicator; an adapter is connected to the lower end of the dial indicator, and a positioning block is detachably connected to the adapter; the positioning block has a first stepped through hole, and the adapter has a second stepped through hole communicating with the first stepped through hole; the sleeve of the dial indicator passes through the second stepped through hole; a measuring rod that slidably abuts against the dial indicator probe is provided in the first stepped through hole, and the lower end of the measuring rod extends out of the bottom of the positioning block and contacts the surface of the heat sink plate; a first limiting part is provided on the measuring rod; a spring abuts against the lower stepped surface of the first stepped through hole, and the other end of the spring is connected to the upper end surface of the first limiting part; a second limiting part restricting the movement of the first limiting part is provided at the bottom of the first stepped through hole; the bottom of the positioning block is a horizontally extending block shape with a flat bottom.

[0006] In the aforementioned dial indicator positioning structure for measuring the heat sink, a fixing sleeve is embedded in the large end of the second step through hole and sleeved outside the dial indicator sleeve. The side of the adapter has a threaded hole that is perpendicular to and communicates with the large end of the second step through hole. A screw is threaded in the threaded hole, and the end of the screw abuts against the fixing sleeve.

[0007] In the aforementioned dial indicator positioning structure for measuring the heat sink, the lower end of the adapter is provided with an external threaded rod, and the upper end of the positioning block is provided with an internal threaded interface that is threadedly connected to and communicates with the external threaded rod.

[0008] In the aforementioned dial indicator positioning structure for measuring the heat sink, the dial indicator is an electronic dial indicator with an accuracy of 0.001 mm.

[0009] In the aforementioned dial indicator positioning structure for measuring the heat sink, the diameter of the upper step of the first step through hole is 2-5 mm larger than the diameter of the lower step.

[0010] In the aforementioned dial indicator positioning structure for measuring the heat sink, the diameter of the upper step of the second step through hole is 1-3 mm larger than the diameter of the lower step.

[0011] In the aforementioned dial indicator positioning structure for measuring the heat sink, the positioning block is made of 304 stainless steel.

[0012] In the aforementioned dial indicator positioning structure for measuring the heat sink, the length of the bottom extension block of the positioning block is 50-80mm.

[0013] Compared with the prior art, the present invention has the following beneficial effects: This invention utilizes a flat, extended block structure at the bottom of the positioning block, which serves as a stable reference surface to adhere to the heat sink surface. This avoids positioning errors caused by uneven angles and force applied manually during traditional handheld measurements, and offers better measurement flexibility and convenience compared to fixed fixtures. Furthermore, the combination of the probe and spring ensures a constant and perpendicular contact force between the dial indicator probe and the heat sink surface, effectively eliminating the impact of contact force fluctuations on the measurement results and further guaranteeing the stability of the positioning reference. In addition, the adapter of this invention allows for the replacement of dial indicators and positioning blocks of different specifications, enabling the selection of corresponding positioning blocks for heat sinks of different sizes. It is suitable for measuring various types of heat sinks, such as CPU heat sink bases and power device heat sinks. Attached Figure Description

[0014] Figure 1 This is the front view of this utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a cross-sectional view of the present invention in use; Figure 4 As shown Figure 3 A partial view of part A shown.

[0015] The markings in the attached diagram are as follows: 1. Dial indicator; 2. Adapter; 3. Positioning block; 4. First step through hole; 5. Second step through hole; 6. Measuring rod; 7. First limiting part; 8. Spring; 9. Fixing sleeve; 10. Threaded hole; 11. Screw; 12. External threaded rod; 13. Internal threaded interface; 14. Second limiting part. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0017] Example: A dial indicator positioning structure for measuring a heat sink, configured as follows Figure 1 and Figure 2 As shown, it includes a dial indicator 1, with an adapter 2 connected to its lower end. The adapter 2 is detachably connected to a positioning block 3. Further, as... Figure 3 and Figure 4As shown, the lower end of the adapter 2 is provided with an M12 external thread rod 12, and the upper end of the positioning block 3 is provided with an internal thread interface 13 that is threadedly connected to and communicates with the external thread rod 12. The positioning block 3 is provided with a first stepped through hole 4, the upper step diameter of the first stepped through hole 4 being 4mm larger than the lower step diameter. The adapter 2 is provided with a second stepped through hole 5 that communicates with the first stepped through hole 4, the upper step diameter of the second stepped through hole 5 being 2mm larger than the lower step diameter. The sleeve of the dial indicator 1 passes through the second stepped through hole 5. Further, a fixing sleeve 9 (made of wear-resistant rubber) is embedded in the larger end of the second stepped through hole 5 and sleeved outside the sleeve of the dial indicator 1. The side of the adapter 2 is provided with a threaded hole 10 that is perpendicular to and communicates with the larger end of the second stepped through hole 5. An M4 screw 11 is fitted into the internal thread of the threaded hole 10. By tightening the screw 11, the end of the screw 11 abuts against the fixing sleeve 9, thereby achieving a stable fixation of the dial indicator 1. A measuring rod 6, 5mm in diameter, is slidably mounted inside the first-step through-hole 4, abutting against the probe of the dial indicator 1. A first limiting part 7 (9mm in diameter) is provided on the measuring rod 6. The lower end of the measuring rod 6 extends beyond the bottom of the positioning block 3 and contacts the surface of the heat sink. A spring 8 (with a stiffness coefficient of 5N / mm to ensure the contact force is stable within the range of 0.5-1N) abuts against the lower step surface of the first-step through-hole 4. The other end of the spring 8 is connected to the upper end face of the first limiting part 7. A second limiting part 14, restricting the movement of the first limiting part 7, is provided at the bottom of the first-step through-hole 4. The positioning block 3 is made of 304 stainless steel. The bottom of the positioning block 3 is a horizontally extending block shape with a flat bottom. The horizontally extending block-shaped side of the bottom of the positioning block 3 is S-shaped with a smooth transition. The flatness error of the bottom of the positioning block 3 is ≤0.002mm, ensuring a tight fit with the surface of the heat sink. The length of the bottom extension block of the positioning block 3 is 60mm. Preferably, the dial indicator 1 is an electronic dial indicator with an accuracy of 0.001 mm. Its probe abuts against the upper end of the measuring rod 6 for real-time feedback of measurement data.

[0018] This invention utilizes the flat, extended block structure at the bottom of the positioning block 3, which serves as a stable reference surface to adhere to the heat sink surface. This avoids positioning errors caused by uneven angles and force applied manually during traditional handheld measurements, and offers better measurement flexibility and convenience compared to fixed fixtures. Furthermore, the cooperative structure of the measuring rod 6 and spring 8 ensures that the dial indicator 1 probe maintains a constant and perpendicular contact force with the heat sink surface through the measuring rod 6, effectively eliminating the influence of contact force fluctuations on the measurement results and further guaranteeing the stability of the positioning reference. In addition, the adapter 2 of this invention can be adapted to replace dial indicators 1 and positioning blocks 3 of different specifications, allowing for the replacement of positioning block 3 extensions of corresponding lengths (50-80mm) according to different heat sink sizes. This makes it suitable for measuring various types of heat sinks, such as CPU heat sink bases and power device heat sinks.

[0019] Work process Figure 2This is a schematic diagram of the present invention before measurement begins. At this time, the first limiting part 7 is in contact with the second limiting part 14, the spring 8 is in the initial position, the positioning block 3 is not in contact with the heat sink, and the probe of the dial indicator 1 naturally abuts against the upper end of the measuring rod 6, thus bringing the probe reading of the dial indicator 1 to zero.

[0020] During operation, the dial indicator 1 is securely fixed by the fixing sleeve 9 inside the adapter 2 and the screw 11 on the side. Its probe abuts against the upper end of the measuring rod 6 inside the first step through hole 4 of the positioning block 3. The flat extension block at the bottom of the positioning block 3 is attached to the surface of the heat sink to serve as a stable reference surface. Figure 3 This is a schematic diagram of the measurement process of this utility model. The lower end of the measuring rod 6 contacts the surface of the heat sink plate. Under the action of the spring 8, the measuring rod 6 maintains a constant and perpendicular contact force with the surface of the heat sink plate. The electronic micrometer 1 provides real-time feedback of measurement data through the displacement change of the measuring rod 6, thereby achieving high-precision detection of the flatness of the heat sink plate.

[0021] In summary, this invention provides a stable positioning reference, enables rapid clamping during the measurement process, and improves convenience.

Claims

1. A dial indicator positioning structure for measuring a heat sink, comprising a dial indicator (1); characterized in that: The dial indicator (1) is connected to an adapter (2) at its lower end. The adapter (2) is detachably connected to a positioning block (3). The positioning block (3) has a first stepped through hole (4). The adapter (2) has a second stepped through hole (5) that communicates with the first stepped through hole (4). The sleeve of the dial indicator (1) passes through the second stepped through hole (5). A measuring rod (6) that slidably abuts against the measuring head of the dial indicator (1) is provided in the first stepped through hole (4). The lower end of the measuring rod (6) extends out of the bottom of the positioning block (3) and contacts the surface of the heat sink. A first limiting part (7) is provided on the measuring rod (6). A spring (8) abuts against the lower step surface of the first stepped through hole (4). The other end of the spring (8) is connected to the upper end surface of the first limiting part (7). A second limiting part (14) that restricts the movement of the first limiting part (7) is provided at the bottom of the first stepped through hole (4). The bottom of the positioning block (3) is a horizontally extending block and the bottom is flat.

2. The dial indicator positioning structure for measuring the heat sink plate according to claim 1, characterized in that: The second step through hole (5) is fitted with a fixed sleeve (9) that is sleeved outside the micrometer (1) sleeve. The side of the adapter (2) is provided with a threaded hole (10) that is perpendicular to and communicates with the second step through hole (5). A screw (11) is threaded in the threaded hole (10), and the end of the screw (11) abuts against the fixed sleeve (9).

3. The dial indicator positioning structure for measuring the heat sink plate according to claim 1, characterized in that: The adapter (2) has an external thread rod (12) at its lower end, and the positioning block (3) has an internal thread interface (13) at its upper end that is threadedly connected to and communicates with the external thread rod (12).

4. The dial indicator positioning structure for measuring the heat sink plate according to claim 1, characterized in that: The dial indicator (1) is an electronic dial indicator (1) with an accuracy of 0.001 mm.

5. The dial indicator positioning structure for measuring the heat sink plate according to claim 1, characterized in that: The diameter of the upper step of the first step through hole (4) is 2-5 mm larger than the diameter of the lower step.

6. The dial indicator positioning structure for measuring the heat sink plate according to claim 1, characterized in that: The diameter of the upper step of the second step through hole (5) is 1-3 mm larger than the diameter of the lower step.

7. The dial indicator positioning structure for measuring a heat sink plate according to claim 1, characterized in that: The positioning block (3) is made of 304 stainless steel.

8. The dial indicator positioning structure for measuring a heat sink plate according to claim 1, characterized in that: The length of the bottom extension block of the positioning block (3) is 50-80mm.

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