Concentricity detection method and device

Abstract

A concentricity detection device includes a profiling mechanism, a measuring mechanism, and a device carrier. The profiling mechanism and the measuring mechanism are disposed on the device carrier, the profiling mechanism is connected to the measuring mechanism, and the measuring mechanism is connected to the device carrier. The profiling mechanism is used to engage with the heat sink oil bag, and the measuring mechanism is used to measure the concentricity of the heat sink oil bag. Compared with the traditional method of judging the alignment of the heat sink oil bag after multi-spot welding by manual visual observation, the use of this device effectively avoids the lack of objectivity of manual observation and improves the accuracy of judgment. Even slight eccentricity of the heat sink oil bag that cannot be seen with the naked eye can be quantified in the measuring mechanism, making it easier for staff to promptly detect eccentricity in the heat sink welding and adjust the multi-spot welding machine in a timely manner, effectively improving production efficiency and enhancing product quality. The concentricity of the heat sink is quantified and the concentricity is intuitively displayed, thereby improving the adjustment efficiency of the multi-spot welding machine.

Description

Technical Field

[0001] The present invention relates to the technical field of concentricity detection, in particular to a concentricity detection method and device. Background Art

[0002] Oil-filled radiator heaters are common household heating devices. Their production process includes stamping, welding, and spraying. The welding process is crucial for the production of the radiator's fins, a crucial component of the heater. Poor welding can directly impact the heater's quality.

[0003] Currently, when welding heat sinks using multi-spot welders, to ensure the alignment of the oil pockets on the large and small fins, the welder uses a press-fit method that uses two upper and lower oil pocket profiling devices. However, during product model changes or long production runs, the two oil pocket profiling devices may become misaligned. To adjust this alignment, manual inspection of the oil pockets on the heat sinks after multi-spot welding is required. This method is often highly subjective and inaccurate. Therefore, a device that can detect and quantify the concentricity of the oil pockets is needed. Summary of the Invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a concentricity detection method and device to solve the problem that when the heat sink is welded, the oil bags of large and small heat sinks are not aligned due to product switching or long-term production, and the manual judgment of the oil bag alignment is too subjective, with low accuracy and low work efficiency.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a concentricity detection method, comprising the following steps:

[0006] S1. Measure and obtain the standard value of the measurement organization;

[0007] S2. Measure and obtain the comparison value of the measuring mechanism;

[0008] S3. Compare the standard value with the comparison value to obtain the nominal value;

[0009] S4. Determine the degree of concentricity.

[0010] As a further improvement of the present invention: the step of measuring and obtaining the standard value includes setting a profiling mechanism that cooperates with the heat sink oil bag in the concentricity detection device, placing the heat sink in the profiling mechanism, obtaining the value on the measuring mechanism and setting it as the standard value, and removing the heat sink.

[0011] As a further improvement of the present invention: the step of placing the heat sink on the profiling mechanism also includes completely fitting the oil bag of the first heat sink to the upper profiling block of the profiling mechanism, and completely fitting the oil bag of the second heat sink to the lower profiling block of the profiling mechanism.

[0012] As a further improvement of the present invention: the step of measuring and obtaining a comparison value includes placing the heat sink assembly in a profiling mechanism, pressing down an upper profiling block of the profiling mechanism, obtaining a value on the measuring mechanism and setting it as a comparison value.

[0013] As a further improvement of the present invention: the heat dissipation assembly is formed by welding a first heat dissipation fin and a second heat dissipation fin.

[0014] As a further improvement of the present invention: the nominal value is the difference between the comparison value and the standard value.

[0015] As a further improvement of the present invention: the step of determining the degree of concentricity includes:

[0016] Compare the nominal value with a set threshold;

[0017] If the nominal value is less than the set threshold, it is determined that the concentricity between the first heat sink oil bag and the second heat sink oil bag is within the allowable range;

[0018] If the nominal value is equal to the set threshold, it is determined that the concentricity between the first heat sink oil pocket and the second heat sink oil pocket is outside the allowable range;

[0019] If the nominal value is greater than the set threshold, it is determined that the concentricity between the first heat sink oil pocket and the second heat sink oil pocket is outside the allowable range.

[0020] As a further improvement of the present invention: the step of determining the degree of concentricity further includes:

[0021] Determine whether the oil bag profiling device of the welding machine needs to be adjusted based on the concentricity of the heat sink;

[0022] If the concentricity is within the allowable range, it is determined that the oil-pack profiling device of the multi-spot welder does not need to be adjusted and the welding process can continue;

[0023] If the concentricity is outside the allowable range, it is determined that the oil-pack profiling device of the multi-spot welding machine needs to be adjusted. After adjusting the oil-pack profiling device, steps S2-S4 are performed again. After it is determined that the concentricity is within the allowable range, the heat sink batch welding process is performed.

[0024] As a further improvement of the present invention: the step of determining the degree of concentricity further includes:

[0025] Repeat steps S2-S4. After the same type of heat sink welding process has been completed for a period of time or a certain number of times, steps S2-S4 need to be performed to determine whether oil pocket misalignment occurs during the heat sink welding.

[0026] A concentricity detection device includes a profiling mechanism, a measuring mechanism and a device carrier, wherein the profiling mechanism and the measuring mechanism are arranged on the device carrier, the profiling mechanism is connected to the measuring mechanism, and the measuring mechanism is connected to the device carrier. The profiling mechanism is used to combine with the heat sink oil bag to determine the concentricity of the heat sink oil bag, and the measuring mechanism is used to measure the concentricity of the heat sink oil bag.

[0027] As a further improvement of the present invention: the profiling mechanism includes an upper profiling block and a lower profiling block, the upper profiling block is connected to the measuring mechanism, and the lower profiling block is connected to the device carrier.

[0028] The upper and lower profiling blocks are detachable and replaceable. The upper and lower profiling blocks can be replaced according to the shape and size of the oil bag of the required welded heat sink product, so that the upper and lower profiling blocks can fully fit the oil bag without welded heat sink.

[0029] As a further improvement of the present invention: the measuring mechanism includes a fixed column, a vernier caliper, a linear guide rail and a sliding block, the fixed column is fixed on the device carrier, the linear guide rail is arranged along the fixed column, and the vernier caliper is arranged on the fixed column.

[0030] As a further improvement of the present invention: the sliding block is connected to the linear guide rail, the sliding block slides along the linear guide rail, the sliding block is connected to the profiling mechanism through a connecting portion, and the connecting portion is connected to the upper profiling block of the profiling mechanism.

[0031] As a further improvement of the present invention: the connecting portion is further provided with an indicator, and the indicator is used to determine the vernier caliper reading.

[0032] As a further improvement of the present invention: the device carrier includes a base, and the base is used to fix the measuring mechanism and the profiling mechanism.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows: the shape and size of the heat sink oil bag are imitated by the profiling block of the profiling mechanism, and the concentricity of the heat sink can be clearly reflected by placing the welded heat sink in the profiling mechanism, and the concentricity can be quantified by the measuring mechanism, making it more intuitive to judge the concentricity. Compared with the traditional method of judging the alignment of the heat sink oil bag after multi-spot welding by manual observation with the naked eye, the use of this device effectively avoids the problem of insufficient objectivity of manual observation, and the judgment accuracy is improved. Even the slight eccentricity of the heat sink oil bag that cannot be seen by the naked eye can be quantified in the measuring mechanism, making it easier for staff to promptly detect the eccentricity of the heat sink welding and adjust the multi-spot welding machine in time, effectively improving production efficiency and enhancing product quality. The concentricity of the heat sink is quantified and the concentricity is intuitively displayed, thereby improving the adjustment efficiency of the multi-spot welding machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the present invention;

[0035] Figure 2 This is a structural front view of the present invention;

[0036] Figure 3 It is a structural side view of the present invention. DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0039] The present invention will be further described with reference to the accompanying drawings and embodiments: Figures 1 to 3As shown, a concentricity detection method includes the following steps:

[0040] S1. Measure and obtain the standard value of the measuring mechanism 2;

[0041] S2. Measure and obtain the comparison value of the measuring mechanism 2;

[0042] S3. Compare the standard value with the comparison value to obtain the nominal value;

[0043] S4. Determine the degree of concentricity.

[0044] The steps of measuring and obtaining the standard value include setting a profiling mechanism 1 that matches the heat sink oil bag in the concentricity detection device, placing the heat sink in the profiling mechanism 1, obtaining the value on the measuring mechanism 2 and setting it as the standard value, and removing the heat sink.

[0045] The step of placing the heat sink on the profiling mechanism 1 also includes completely fitting the oil bag of the first heat sink to the upper profiling block 11 of the profiling mechanism 1 , and completely fitting the oil bag of the second heat sink to the lower profiling block 12 of the profiling mechanism 1 .

[0046] The steps of measuring and obtaining the comparison value include placing the heat sink assembly in the profiling mechanism 1, pressing down the upper profiling block 11 of the profiling mechanism 1, obtaining the value on the measuring mechanism 2 and setting it as the comparison value.

[0047] The heat dissipation assembly is formed by welding a first heat dissipation fin and a second heat dissipation fin.

[0048] The nominal value is the difference between the comparison value and the standard value.

[0049] The step of determining the degree of concentricity comprises:

[0050] Compare the nominal value with a set threshold;

[0051] Specifically, if the nominal value is less than a set threshold, it is determined that the concentricity between the first heat sink oil pocket and the second heat sink oil pocket is within an allowable range;

[0052] If the nominal value is equal to the set threshold, it is determined that the concentricity between the first heat sink oil pocket and the second heat sink oil pocket is outside the allowable range;

[0053] If the nominal value is greater than the set threshold, it is determined that the concentricity between the first heat sink oil pocket and the second heat sink oil pocket is outside the allowable range.

[0054] As a further improvement of the present invention: the step of determining the degree of concentricity further includes:

[0055] Determine whether the oil bag profiling device of the welding machine needs to be adjusted based on the concentricity of the heat sink;

[0056] Specifically, if the degree of concentricity is within the allowable range, it is determined that the oil-pack profiling device of the multi-spot welding machine does not need to be adjusted, and the welding process is continued;

[0057] If the concentricity is outside the allowable range, it is determined that the oil-pack profiling device of the multi-spot welding machine needs to be adjusted. After adjusting the oil-pack profiling device, steps S2-S4 are performed again. After it is determined that the concentricity is within the allowable range, the heat sink batch welding process is performed.

[0058] As a further improvement of the present invention: the step of determining the degree of concentricity further includes:

[0059] Repeat steps S2-S4. After the same type of heat sink welding process has been completed for a period of time or a certain number of times, steps S2-S4 need to be performed to determine whether oil pocket misalignment occurs during the heat sink welding.

[0060] A concentricity detection device includes a profiling mechanism 1, a measuring mechanism 2 and a device carrier 3. The profiling mechanism 1 and the measuring mechanism 2 are arranged on the device carrier 3, the profiling mechanism 1 is connected to the measuring mechanism 2, and the measuring mechanism 2 is connected to the device carrier 3. The profiling mechanism 1 is used to combine with the heat sink oil bag to determine the concentricity of the heat sink oil bag, and the measuring mechanism 2 is used to measure the concentricity of the heat sink oil bag.

[0061] The profiling mechanism 1 includes an upper profiling block 11 and a lower profiling block 12 . The upper profiling block 11 is connected to the measuring mechanism 2 , and the lower profiling block 12 is connected to the device carrier 3 .

[0062] Specifically, the upper profiling block 11 and the lower profiling block 12 are removable and replaceable. The upper profiling block 11 and the lower profiling block 12 are replaced according to the shape and size of the oil bag of the required welded heat sink product, so that the upper profiling block 11 and the lower profiling block 12 are completely fitted with the oil bag without welded heat sink.

[0063] The measuring mechanism 2 includes a fixed column 21 , a vernier caliper 22 , a linear guide rail 23 and a sliding block 24 . The fixed column 21 is fixed on the device carrier 3 , the linear guide rail 23 is arranged along the fixed column 21 , and the vernier caliper 22 is arranged on the fixed column 21 .

[0064] The sliding block 24 is connected to the linear guide rail 23 , and the sliding block 24 slides along the linear guide rail 23 . The sliding block 24 is connected to the profiling mechanism 1 via a connecting portion 5 , and the connecting portion 5 is connected to the upper profiling block 11 of the profiling mechanism 1 .

[0065] The connecting portion 5 is further provided with an indicator 51 , and the indicator 51 is used to determine the vernier caliper reading.

[0066] The device carrier 3 includes a base, which is used to fix the measuring mechanism 2 and the profiling mechanism 1 .

[0067] The working principle of the present invention is that when a multi-spot welder welds heat sinks, the oil pocket profiling device of the multi-spot welder may misalign due to product model switching or long-term production, resulting in reduced workpiece quality. To ensure the quality of the heat sink oil pocket welding, it is necessary to determine whether the center of the heat sink oil pocket welded by the multi-spot welder is aligned. Therefore, the device of the present invention is required to detect the concentricity of the heat sink oil pocket. The upper profiling block 11 and the lower profiling block 12 installed on the device respectively imitate the shape of the oil pocket of the large and small heat sinks. The upper and lower profiling blocks are completely aligned with the heat sink oil pocket. The measuring mechanism 2 is used to detect the oil pocket, and the standard value data is read from the vernier caliper 22 of the measuring mechanism 2. The welded heat sink assembly is then placed in the center of the profiling mechanism 1, and the upper profiling block 11 of the profiling mechanism 1 is pressed downward to read the measurement comparison value data of the measuring mechanism 2. The difference between the comparison value data and the standard value data is the center deviation value of the oil pocket of the welded heat sink, which objectively and directly determines the concentricity of the oil pocket. After a period of time or when the product model is switched, the concentricity of the heat sink oil bag is detected to maintain the welding quality of the multi-spot welder. At the same time, it also improves the adjustment efficiency of the multi-spot welder and reduces the labor intensity of employees.

[0068] Implementation Case 1:

[0069] This embodiment provides a concentricity detection method. An upper profiling block 11 and a lower profiling block 12 are installed on a concentricity detection device. The upper profiling block 11 and the lower profiling block 12 have the same shape and size as the oil pocket of the heat sink to be measured. The oil pocket of the heat sink is fitted to the upper profiling block 11 and the lower profiling block 12, respectively. The upper profiling block 11 is pressed down to obtain the standard value data of the vernier caliper 22, and the heat sink is removed. The first welded heat sink assembly is placed in the center of the profiling mechanism 1. The upper profiling block 11 is pressed down to obtain the first comparison value data of the vernier caliper 22. The difference between the first comparison value and the standard value is the first nominal value. The first nominal value is compared with a set threshold value. If the first nominal value is less than the set threshold value, it is determined that the concentricity of the oil pocket of the first heat sink assembly is high and within the allowable range. The welding process continues without adjusting the multi-spot welder.

[0070] After 30 minutes, obtain the welded second heat sink assembly and place it in the center of profiling mechanism 1. Press down on upper profiling block 11 and obtain a second comparison value from vernier caliper 22. The difference between the second comparison value and the standard value is the second nominal value. Compare the second nominal value with a set threshold. If the second nominal value is less than the set threshold, the oil pocket concentricity of the second heat sink assembly is determined to be high and within the allowable range. Continue welding without adjusting the multi-spot welder. Repeat this oil pocket concentricity test every 30 minutes.

[0071] Implementation Case 2:

[0072] This second embodiment provides a concentricity detection method. An upper profiling block 11 and a lower profiling block 12 are installed on a concentricity detection device. The upper profiling block 11 and the lower profiling block 12 have the same shape and size as the oil pocket of the heat sink to be measured. The oil pocket of the heat sink is fitted to the upper profiling block 11 and the lower profiling block 12, respectively. The upper profiling block 11 is pressed downward to obtain the standard value data of the vernier caliper 22, and the heat sink is removed. The first welded heat sink assembly is placed in the center of the profiling mechanism 1. The upper profiling block 11 is pressed downward to obtain the first comparison value data of the vernier caliper 22. The difference between the first comparison value and the standard value is the first nominal value. The first nominal value is compared with a set threshold. If the first nominal value is greater than or equal to the set threshold, it is determined that the concentricity of the oil pocket of the first heat sink assembly is low and outside the allowable range. The welding process is suspended, and the oil pocket profiling equipment of the multi-spot welder is adjusted.

[0073] After adjustment, obtain the welded second heat sink assembly and place it in the center of profiling mechanism 1. Press down on upper profiling block 11 and obtain a second comparison value from vernier caliper 22. The difference between the second comparison value and the standard value is the second nominal value. Compare the second nominal value with a set threshold. If the second nominal value is less than the set threshold, the oil pocket concentricity of the second heat sink assembly is determined to be high and within the allowable range. Continue welding without adjusting the multi-spot welder. Repeat this oil pocket concentricity test every 30 minutes.

[0074] Implementation Case 3:

[0075] This third embodiment provides a concentricity detection method. An upper profiling block 11 and a lower profiling block 12 are installed on a concentricity detection device. The upper profiling block 11 and the lower profiling block 12 are identical in shape and size to the oil pocket of the heat sink to be measured. The oil pocket of the heat sink is fitted to the upper profiling block 11 and the lower profiling block 12, respectively. The upper profiling block 11 is pressed downward to obtain the standard value data of the vernier caliper 22, and the heat sink is removed. The first welded heat sink assembly is placed in the center of the profiling mechanism 1. The upper profiling block 11 is pressed downward to obtain the first comparison value data of the vernier caliper 22. The difference between the first comparison value and the standard value is the first nominal value. The first nominal value is compared with a set threshold. If the first nominal value is less than the set threshold, it is determined that the concentricity of the oil pocket of the first heat sink assembly is high and within the allowable range. The welding process continues without adjusting the multi-spot welder.

[0076] After welding 50 heat sink assemblies, obtain a second heat sink assembly that has been welded. Place the second heat sink assembly in the center of profiling mechanism 1, press down on upper profiling block 11, and obtain a second comparison value from vernier caliper 22. The difference between the second comparison value and the standard value is the second nominal value. Compare the second nominal value with a set threshold. If the second nominal value is less than the set threshold, it is determined that the oil pocket concentricity of the second heat sink assembly is high and within the allowable range. Continue welding without adjusting the multi-spot welder. Repeat this oil pocket concentricity test for each 50 heat sink assemblies welded.

[0077] Implementation Case 4:

[0078] This fourth embodiment provides a concentricity detection method. An upper profiling block 11 and a lower profiling block 12 are installed on a concentricity detection device. The upper profiling block 11 and the lower profiling block 12 have the same shape and size as the oil pocket of the heat sink to be measured. The oil pocket of the heat sink is fitted to the upper profiling block 11 and the lower profiling block 12, respectively. The upper profiling block 11 is pressed downward to obtain the standard value data of the vernier caliper 22, and the heat sink is removed. The first welded heat sink assembly is placed in the center of the profiling mechanism 1. The upper profiling block 11 is pressed downward to obtain the first comparison value data of the vernier caliper 22. The difference between the first comparison value and the standard value is the first nominal value. The first nominal value is compared with a set threshold. If the first nominal value is greater than or equal to the set threshold, it is determined that the concentricity of the oil pocket of the first heat sink assembly is low and outside the allowable range. The welding process is suspended, and the oil pocket profiling equipment of the multi-spot welder is adjusted.

[0079] After adjustment, obtain the welded second heat sink assembly and place it in the center of profiling mechanism 1. Press down on profiling block 11 and obtain a second comparison value from vernier caliper 22. The difference between the second comparison value and the standard value is the second nominal value. Compare the second nominal value with a set threshold. If the second nominal value is less than the set threshold, the oil pocket concentricity of the second heat sink assembly is determined to be high and within the allowable range. Continue welding without adjusting the multi-spot welder. Repeat this oil pocket concentricity test for every 50 heat sink assemblies welded.

[0080] The main function of the present invention is to imitate the shape and size of the heat sink oil bag through the profiling block of the profiling mechanism. When the welded heat sink is placed in the profiling mechanism, the concentricity of the heat sink can be clearly reflected. The concentricity can be quantified by the measuring mechanism, making it more intuitive to judge the concentricity. Compared with the traditional method of judging the alignment of the heat sink oil bag after multi-spot welding by manual observation with the naked eye, the use of this device effectively avoids the problem of insufficient objectivity of manual observation, and the judgment accuracy is improved. Even the slight eccentricity of the heat sink oil bag that cannot be seen by the naked eye can be quantified in the measuring mechanism, which makes it easy for the staff to promptly discover the eccentricity of the heat sink welding and adjust the multi-spot welding machine in time, effectively improving production efficiency and enhancing product quality. The concentricity of the heat sink is quantified and the concentricity is intuitively displayed, thereby improving the adjustment efficiency of the multi-spot welding machine.

[0081] In summary, after reading the present invention document, ordinary technicians in this field can make various other corresponding transformation schemes based on the technical solutions and technical concepts of the present invention without creative mental work, and all of them fall within the scope of protection of the present invention.

Claims

1. A concentricity detection device, characterized in that: The device comprises a profiling mechanism, a measuring mechanism and a device carrier, wherein the profiling mechanism and the measuring mechanism are arranged on the device carrier, the profiling mechanism is connected to the measuring mechanism, and the measuring mechanism is connected to the device carrier. The profiling mechanism is used to combine with the heat sink oil bag, and the measuring mechanism is used to measure the concentricity of the heat sink oil bag. The profiling mechanism comprises an upper profiling block and a lower profiling block, the upper profiling block is connected to the measuring mechanism, and the lower profiling block is connected to the device carrier. The measuring mechanism comprises a fixed column, a vernier caliper, a linear guide and a sliding block, the fixed column is fixed to the device carrier, the linear guide is arranged along the fixed column, and the vernier caliper is arranged on the fixed column; An upper profiling block and a lower profiling block are installed on the concentricity detection device. The upper profiling block and the lower profiling block have the same shape and size as the oil bag of the heat sink to be measured. The oil bag of the heat sink is respectively fitted with the upper profiling block and the lower profiling block, and the upper profiling block is pressed down to obtain the standard value data of the vernier caliper 22, and the heat sink is removed; the welded first heat sink assembly is placed in the middle of the profiling mechanism, and the upper profiling block is pressed down to obtain the first comparison value data of the vernier caliper. The difference between the first comparison value and the standard value is the first nominal value.

2. A concentricity detection device according to claim 1, characterized in that: The sliding block is connected to the linear guide rail, and the sliding block slides along the linear guide rail. The sliding block is connected to the profiling mechanism through a connecting portion, and the connecting portion is connected to the upper profiling block of the profiling mechanism.

3. The concentricity detection method of a concentricity detection device according to any one of claims 1 to 2, characterized in that: The following steps are involved: S1. Measure and obtain the standard value of the measurement organization; S2. Measure and obtain the comparison value of the measuring mechanism; S3. Compare the standard value with the comparison value to obtain the nominal value; S4. Determine the degree of concentricity; The measuring and obtaining standard value step includes providing a profiling mechanism that matches the heat sink oil bag on the concentricity detection device, placing the heat sink in the profiling mechanism, obtaining the value on the measuring mechanism and setting it as the standard value, and removing the heat sink; Determine whether the oil bag profiling device of the welding machine needs to be adjusted based on the concentricity of the heat sink; If the concentricity is within the allowable range, it is determined that the oil-pack profiling device of the multi-spot welder does not need to be adjusted and the welding process can continue; If the concentricity is outside the allowable range, it is determined that the oil bag profiling device of the multi-spot welding machine needs to be adjusted. After the oil bag profiling device is adjusted, steps S2-S4 are repeated. When it is determined that the concentricity is within the allowable range, the heat sink batch welding process is carried out again. The step of judging the degree of concentricity also includes: repeating steps S2-S4, and after the same type of heat sink welding process has been performed for a period of time or a certain number of times, steps S2-S4 need to be performed to judge whether oil bag dislocation occurs in the heat sink welding.

4. A concentricity detection method according to claim 3, characterized in that: The step of placing the heat sink on the profiling mechanism also includes fitting the oil bag of the first heat sink to the upper profiling block of the profiling mechanism, and fitting the oil bag of the second heat sink to the lower profiling block of the profiling mechanism.

5. A concentricity detection method according to claim 3, characterized in that: The steps of measuring and obtaining a comparison value include placing the heat sink assembly in a profiling mechanism, pressing down an upper profiling block of the profiling mechanism, obtaining a value on the measuring mechanism and setting it as a comparison value.

6. A concentricity detection method according to claim 3, characterized in that: The nominal value is the difference between the comparison value and the standard value.

7. A concentricity detection method according to claim 3, characterized in that: The step of determining the degree of concentricity comprises: Compare the nominal value with a set threshold; If the nominal value is less than the set threshold, it is determined that the concentricity between the first heat sink oil pocket and the second heat sink oil pocket is high; If the nominal value is equal to the set threshold, it is determined that the concentricity between the first heat sink oil pocket and the second heat sink oil pocket is low; If the nominal value is greater than the set threshold, it is determined that the concentricity between the first radiator fin oil pocket and the second radiator fin oil pocket is low.

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