A method and device for detecting the sealing property of a side turn signal of an automobile rearview mirror

Abstract

The application relates to a kind of automobile rearview mirror side turn signal sealing detection method and detection device, it relates to air tightness detection technical field, it includes: in response to detection signal, control preset gas supply equipment to fill gas in workpiece, and the actual internal pressure inside workpiece is collected;When actual internal pressure is not less than preset test internal pressure, stop filling gas;According to the variation amplitude of actual internal pressure, determine first pressure drop rate;When first pressure drop rate is greater than preset leakage threshold, it is judged as air leakage piece;Drive preset compression structure to switch the depression state of workpiece, fill gas again so that actual internal pressure is not less than test internal pressure;According to the variation amplitude of current actual internal pressure, determine second pressure drop rate again;Compare the variation characteristics of first pressure drop rate and second pressure drop rate to determine air leakage position;Based on different air leakage position, classified discharge is carried out.The application has the effect of reducing the bottom leakage point misjudgment and improving detection accuracy.

Description

Technical Field

[0001] This invention relates to the field of airtightness testing technology, and in particular to a method and device for testing the airtightness of the turn signal on the side of a car rearview mirror. Background Technology

[0002] Exposed turn signals on rearview mirrors are prone to water ingress, and moisture can corrode LED circuits, causing light malfunction and affecting driving safety. Sealing inspection can screen out assembly defects, ensure waterproof performance, and meet factory quality inspection standards.

[0003] Currently, when testing the airtightness of the turn signal on the side of a car rearview mirror, the workpiece is placed on the positioning seat of the testing station, and the clamping mechanism is driven to clamp the workpiece to achieve end face sealing. Standard pressure gas is then injected into the inner cavity through the pipeline and the pressure is maintained. The pressure sensor collects the air pressure in the cavity in real time, records the air pressure change during the pressure maintenance stage, and compares it with the preset pressure threshold to determine whether the workpiece seal is qualified.

[0004] However, in existing testing, the bottom of the workpiece is tightly attached to the positioning seat, and the bottom leakage point is blocked. The sensor cannot identify the leakage, and it is easy to misjudge the workpiece with bottom leakage as a qualified product. Summary of the Invention

[0005] To reduce the number of missed leaks at the bottom and improve detection accuracy, this invention provides a method and device for detecting the sealing performance of the turn signal on the side of a car rearview mirror.

[0006] In a first aspect, the present invention provides a method for detecting the sealing performance of a car rearview mirror side turn signal, which adopts the following technical solution: A method for testing the sealing performance of a car rearview mirror side turn signal includes: S10: In response to the detection signal, control the preset air supply device to inflate the workpiece with air and collect the actual internal pressure inside the workpiece. S11: Stop inflation when the actual internal pressure is not less than the preset test internal pressure; S12: Determine the first pressure drop rate based on the actual internal pressure change. S13: When the first pressure drop rate is greater than the preset leakage threshold, it is determined to be a leaking component; S14: Drive the preset clamping structure to switch the workpiece's pressing state, and re-inflate to ensure that the actual internal pressure is not less than the test internal pressure. S15: Re-determine the second pressure drop rate based on the current actual internal pressure change. S16: Determine the location of the leak by comparing the changes in the first pressure drop rate and the second pressure drop rate; S17: Classify and cut materials based on different leakage locations.

[0007] By adopting the above technical solution, two different sealing conditions are formed by switching the workpiece's pressure state. The pressure drop rate under the corresponding conditions is obtained respectively. The leakage causes are distinguished by the difference in leakage characteristics between the two conditions. This reduces the situation where the bottom of the workpiece is completely attached to the tooling, causing pressure relief and blockage, which leads to missed detection of bottom leakage points, and improves the detection accuracy.

[0008] Optional methods for determining the location of the leak include: S20: The pressure drop ratio is calculated by dividing the second pressure drop rate by the first pressure drop rate; S210: If the pressure drop ratio is not greater than the preset ratio threshold, the leak location is determined to be only a side leak; S211: If the pressure drop ratio is greater than the ratio threshold, the corresponding workpiece will be transferred to the preset re-inspection equipment for re-inspection, and the bottom of the workpiece will be sealed and fitted with the re-inspection equipment. S212: Inflate the workpiece with air and collect the internal pressure for retest until the retest internal pressure is not less than the test internal pressure, then stop inflating. S213: Determine the third pressure drop rate based on the change in internal pressure during re-inspection; S2140: When the third pressure drop rate is greater than the leakage threshold, it is determined that there is leakage at both the side and bottom. S2141: When the third pressure drop rate is not greater than the leakage threshold, it is determined that there is only bottom leakage.

[0009] By adopting the above technical solution, the bottom of the workpiece is sealed separately using the re-inspection equipment to achieve physical zoning detection of leak points, accurately distinguishing three types of defects: only side leakage, only bottom leakage, and combined side and bottom leakage, thus adapting to the differentiated processing needs of workpieces with different defects.

[0010] Optionally, after determining the location of the leak, the following should be included: S30: Match the stamping depth and material feeding position according to the location of the air leak; S31: Obtain the workpiece hardness corresponding to the workpiece, and obtain the preset stamp hardness and tip wear of the stamp. S32: Determine the force of the stamp by combining the stamping depth, workpiece hardness, tip wear, and stamp head hardness; S33: Based on the execution force, control the trowel to press the outer wall of the workpiece to form an indentation mark and update the tip wear, and then control the workpiece to be unloaded based on the unloading position.

[0011] By adopting the above technical solution, the puncture force is adaptively matched by multi-dimensional parameters such as workpiece material hardness, puncture head hardness, tip wear state, and target puncture depth. At the same time, the linkage control of defect identification and classification material cutting is realized to ensure that workpieces with different air leakage locations correspond to exclusive identification and material cutting stations.

[0012] Optionally, controlling the execution of the poker head includes: S40: Collect the actual depth of the current stamp head being pressed in; S41: Determine the wear increment by combining the stamping depth and the stamping depth; S42: Calculate the sum of the wear increment and the tip wear, and replace the updated tip wear with the result; S43: When the tip wear is not less than the preset wear threshold, a prompt to replace the poker tip is issued.

[0013] By adopting the above technical solution, the wear increment of the stamp tip is calculated in real time by utilizing the deviation between the actual stamping depth and the target stamping depth, so as to realize the dynamic iterative update of the wear degree, complete the adaptive compensation of the stamp tip passivation state, and promptly prompt the replacement of the stamp tip when the stamp tip is severely worn.

[0014] Optionally, when collecting the actual internal pressure inside the workpiece, the following should be included: S50: Obtain the internal sealed cavity volume of the workpiece, the connection volume of the connection section between the air supply device and the workpiece, and the inflation rate for performing inflation. S51: Determine the standard inflation time for the workpiece to reach the test internal pressure by combining the internal cavity volume, connection volume, inflation rate and test internal pressure. S52: Obtain the actual inflation time when the actual internal pressure is not less than the test internal pressure; S53: If the actual inflation time is less than the standard inflation time, it is determined to be an alignment misalignment and inflation is stopped; S54: Determine the fourth pressure drop rate based on the actual internal pressure change. S55: Determine the offset type based on the fourth pressure drop rate and make corresponding classification adjustments.

[0015] By adopting the above technical solution, the standard inflation time is calibrated by using the volume to be inflated and the inflation rate. The deviation between the actual inflation time and the standard inflation time is used to identify the alignment deviation between the air supply equipment and the workpiece. At the same time, the fourth pressure drop rate is used to accurately distinguish the type of deviation defect, so as to achieve accurate identification and classification control of abnormal working conditions.

[0016] Optionally, after determining the fourth voltage drop rate, the following is included: S60: If the fourth pressure drop rate is not greater than the preset pressure drop threshold, the offset type is determined to be severe blockage offset, and an immediate adjustment alarm is issued; S61: If the fourth pressure drop rate is greater than the pressure drop threshold, the offset type is determined to be slight blockage offset, and a delay adjustment alarm is issued; S62: Determine the actual inflation volume based on the actual inflation time and inflation rate, and determine the required inflation volume based on the inner cavity volume, connection volume and test internal pressure; S63: Determine the inflation volume difference by combining the actual inflation volume and the required inflation volume; S64: Gas is supplied to the interior of the workpiece based on the difference in gas volume.

[0017] By adopting the above technical solution, the severity of the alignment deviation is determined by comparing the fourth pressure drop rate with the pressure drop threshold. In case of severe deviation, the machine is stopped immediately for adjustment. In case of slight deviation, the machine is delayed for rectification and gas is replenished to ensure that the pressure reference for subsequent pressure measurement is consistent and to reduce the interference of tooling deviation on the detection accuracy.

[0018] Optionally, methods for gas replenishment include: S70: Determine the rate of change of pressure volume in the connecting section per unit time based on the fourth pressure drop rate and the connecting volume; S71: Collect and detect the ambient temperature and match the conversion factor; S72: Determine the air supply rate to maintain pressure balance in the connecting section by combining the rate of change and the conversion factor; S73: Calculate the required inflation time based on the inflation rate and the difference in inflation volume; S74: Control the gas supply equipment to fill the workpiece with gas based on the gas replenishment rate and gas replenishment duration.

[0019] By adopting the above technical solution, the gas replenishment rate and gas replenishment duration are matched by utilizing the changing characteristics of pipeline pressure volume, ensuring that the internal pressure of the workpiece is stably maintained within the standard test pressure range, and avoiding excessive internal pressure caused by excessively fast gas replenishment or efficiency reduction caused by excessively slow gas replenishment.

[0020] Secondly, this application provides a device for detecting the sealing performance of a car rearview mirror side turn signal, which adopts the following technical solution: A device for testing the sealing performance of a car rearview mirror side turn signal, controlled by a method for testing the sealing performance of a car rearview mirror side turn signal as described in the first aspect, includes a fixing component and a sealing testing component; the fixing component includes a mounting seat for accommodating a workpiece and a clamping structure for pressing and fixing the workpiece on the mounting seat. The mounting base has a support protrusion on the side near the workpiece. Several support protrusions are provided and evenly distributed on the mounting base. The support protrusions are used to support the workpiece and form a pressure relief channel under the workpiece during the testing process.

[0021] By adopting the above technical solution, the workpiece is supported by evenly arranged support protrusions, so that a through pressure relief channel is formed between the bottom of the workpiece and the mounting seat. This reduces the situation where the bottom of the workpiece is completely attached to the tooling, causing pressure relief blockage and thus leading to missed detection of bottom leakage points, thereby improving the accuracy of detection.

[0022] Optionally, the sealing detection assembly includes a sealing block, a detection structure, and a pushing structure. The sealing block is used to seal and fit against the outside of the workpiece detection port. The detection structure is used to inflate the workpiece with air through the detection port. The pushing structure is used to drive the sealing block and the detection structure closer to or further away from the workpiece.

[0023] By adopting the above technical solution, the sealing block and the detection structure are moved synchronously by the push structure, so as to realize the automatic sealing and inflation detection of the detection port. The action coordination is good and it can stably complete the whole process of inflation of the workpiece cavity, pressure acquisition and pressure stabilization and leak detection.

[0024] Optionally, it also includes a dent, which slides in a direction toward or away from the workpiece, and the end of the dent facing the workpiece is configured as a pointed cone to press the outer wall of the workpiece to form an indentation mark.

[0025] By adopting the above technical solution, the sliding-set puncture head can be brought closer to or away from the workpiece, and the conical structure can form a clear, durable and difficult-to-wipe dent defect mark on the outer wall of the workpiece, so as to realize the visual distinction of workpieces with different air leakage defects.

[0026] In summary, the present invention has at least one of the following beneficial technical effects: By switching the workpiece under pressure, two different sealing conditions are formed, and the pressure drop rate under the corresponding conditions is obtained. The leakage causes are distinguished by the difference in leakage characteristics between the two conditions. This reduces the situation where the bottom of the workpiece is completely attached to the tooling, causing pressure relief and blockage, which leads to missed detection of bottom leakage points and improves the detection accuracy. The standard inflation time is calibrated by using the volume to be inflated and the inflation rate. The deviation between the actual inflation time and the standard inflation time is used to identify the alignment misalignment between the air supply equipment and the workpiece. At the same time, the fourth pressure drop rate is used to accurately distinguish the type of misalignment defect, so as to achieve accurate identification and classification control of abnormal working conditions. By using evenly distributed support protrusions to support the workpiece, a through pressure relief channel is formed between the bottom of the workpiece and the mounting base. This reduces the possibility of the bottom of the workpiece being completely pressed against the tooling, causing pressure relief blockage and thus leading to missed leaks at the bottom, thereby improving the accuracy of the test. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a device for testing the sealing performance of a car rearview mirror side turn signal. Figure 2 A partial schematic diagram of a vehicle rearview mirror side turn signal sealing testing device. Figure 1 ; Figure 3 A partial schematic diagram of a vehicle rearview mirror side turn signal sealing testing device. Figure 2 ; Figure 4A partial schematic diagram of a vehicle rearview mirror side turn signal sealing testing device. Figure 3 .

[0028] The parts referred to by the numbers in the above attached figures are as follows: 1. Workbench; 2. Fixing component; 21. Mounting seat; 211. Workpiece mounting slot; 212. Pick-up and placement clearance slot; 213. Engraving clearance slot; 214. Detection clearance slot; 215. Support protrusion; 22. Clamping structure; 3. Sealing detection component; 31. Sealing block; 32. Detection structure; 321. Vent block; 322. Vent pipe; 33. Pushing structure; 4. Marking component; 41. Stamp; 42. Drive structure; 5. Pad block. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0030] This invention discloses a device for testing the sealing performance of the turn signal side of a car rearview mirror.

[0031] Reference Figure 1 A device for testing the sealing performance of a car rearview mirror side turn signal includes a workbench 1, a fixing component 2, a sealing testing component 3, a marking component 4, and a pad 5. The fixing component 2, the sealing testing component 3, and the marking component 4 are all fixedly installed on the upper surface of the workbench 1 by the pad 5. The fixing component 2, the sealing testing component 3, and the marking component 4 are symmetrically arranged in two sets, which are used to test the left turn signal and the right turn signal respectively.

[0032] Reference Figure 2 and Figure 3 The fixing component 2 includes a mounting base 21 and a clamping structure 22. The mounting base 21 is fixedly installed on the upper surface of the workbench 1 by a pad 5. The mounting base 21 has a workpiece mounting groove 211 that matches the outer contour of the workpiece, a pick-up and put-down clearance groove 212 for easy loading and unloading, an engraving clearance groove 213 for the marking component 4 to pass through to perform engraving, and a detection clearance groove 214 for the sealing detection component 3 to pass through to perform sealing detection. The detection clearance groove 214 is located behind the workpiece mounting groove 211 and corresponds to the position of the detection port on the workpiece. The bottom of the workpiece mounting groove 211 of the mounting base 21 is provided with a number of support protrusions 215. The support protrusions 215 are evenly distributed in an array. The support protrusions 215 are integrally formed with the mounting base 21 and can all be made of slightly elastic MC cast nylon. The clamping structure 22 can be a rotary clamping cylinder. The clamping structure 22 is fixedly installed on the workbench 1 by a pad 5 and is located on one side of the mounting base 21.

[0033] Reference Figure 4The sealing detection component 3 includes a sealing block 31, a detection structure 32, and a pushing structure 33. The pushing structure 33 can be a guide rod cylinder. The pushing structure 33 is fixedly installed on the worktable 1 by a pad 5 and is located behind the mounting seat 21. The execution direction of the pushing structure 33 is set back and forth. The detection structure 32 includes a venting block 321 and a venting pipe 322. The venting block 321 is fixedly installed at the output end of the pushing structure 33. The venting pipe 322 is fixedly installed at the front end of the venting block 321 and corresponds to the detection port position of the workpiece. A pipe is opened in the venting block 321 to connect the external air supply equipment to the venting pipe 322. The sealing block 31 is fixedly installed at the front end of the venting block 321 and sleeved on the outside of the venting pipe 322. The sealing block 31 can be made of a highly elastic and wear-resistant material, such as polyurethane (PU).

[0034] The marking component 4 includes a punch 41 and a drive structure 42. The drive structure 42 can be a push cylinder. The drive structure 42 is fixedly installed on the worktable 1 by a pad block 5 and is located on the side of the mounting seat 21 away from the pressing structure 22. The execution direction of the drive structure 42 is set to left and right. The punch 41 is fixedly installed at the output end of the drive structure 42 and corresponds to the marking avoidance groove 213. The end of the punch 41 facing the workpiece is set as a pointed cone.

[0035] The front end of the mounting base 21 is fixedly installed on the workbench 1, and the rear end of the mounting base 21 is fixedly installed on the workbench 1 using the pad 5. When the workpiece is placed in the workpiece placement slot 211, the rear end face of the workpiece with the detection port will be vertical. The clamping structure 22 and the driving structure 42 are fixedly installed at appropriate positions on both sides of the mounting base 21 using the pad 5, and the pushing structure 33 is fixedly installed at a appropriate position behind the mounting base 21 using the pad 5. The installation height can be adjusted by changing the type of the pad 5. During testing, the workpiece is placed in the workpiece placement slot 211 of the mounting base 21, and the clamping structure 22 is activated. The clamping structure 22 presses the workpiece downwards and fixes it in the workpiece placement slot 211. At this time, the bottom of the workpiece is in close contact with the support protrusion 215, and there is a hollow gap between the workpiece and the bottom of the workpiece placement slot 211. The hollow gap forms a pressure relief channel, which can... To reduce the probability of leaks at the bottom of the workpiece being pressed and sealed; the pushing structure 33 is activated, which drives the venting block 321 and the sealing block 31 forward and through the detection clearance groove 214. The venting block 321 drives the vent pipe 322 to fit against the detection port on the workpiece, and the front side of the sealing block 31 fits against the rear end face of the workpiece and seals the area around the detection port. The external air supply equipment is activated, and gas is injected into the workpiece through the venting block 321 and the vent pipe 322. After a certain period of time, the pressure change inside the workpiece is detected to determine the workpiece's sealing performance. After the test, the driving structure 42 is activated, which drives the punch 41 to move toward the side of the workpiece. The punch 41 moves along the engraved clearance groove 213 and squeezes the outer wall of the workpiece to form an indentation mark. The workpiece is then removed to complete the workpiece sealing performance test. The placement clearance groove 212 facilitates the handling of the workpiece by the operator or robot.

[0036] Based on the same inventive concept, embodiments of the present invention provide a method for testing the sealing performance of the turn signal on the side of a car rearview mirror.

[0037] A method for testing the sealing performance of a car rearview mirror side turn signal includes the following steps: S10: In response to the detection signal, control the preset air supply device to inflate the workpiece with air and collect the actual internal pressure inside the workpiece.

[0038] The detection signal refers to the electrical trigger signal that initiates the entire airtightness testing process. When the workpiece is fully seated and positioned, the workpiece body blocks the optical path of the pre-set photoelectric sensor transmitter and receiver. The photoelectric sensor then transmits a high-level trigger signal, i.e., the detection signal, to the controller.

[0039] The gas supply equipment refers to the hardware unit that outputs stable and dry detection gas. The gas supply equipment is connected to the gas pipe 322 through the gas block 321. When the gas pipe 322 is in contact with the detection port of the workpiece, the sealing block 31 will block the gap and the gas supply equipment will supply gas to the workpiece.

[0040] Vent block 321, vent pipe 322 and sealing block 31 are all structures in a vehicle rearview mirror side turn light sealing test device.

[0041] The actual internal pressure refers to the real-time gas pressure value inside the sealed inner cavity of the workpiece. Since the workpiece is constantly being replaced, it is not possible to directly install a pressure sensor inside the workpiece. However, the vent pipe 322 is sealed and connected to the inside of the workpiece during the gas supply process. Therefore, a pressure sensor is installed in the vent pipe 322 in advance, and the pressure value collected in real time by the pressure sensor is used as the actual internal pressure inside the workpiece.

[0042] S11: Stop inflation when the actual internal pressure is not less than the preset test internal pressure.

[0043] The test internal pressure refers to the standard pressure for airtightness testing specified in the workpiece's factory inspection specifications. The test internal pressure is set in advance by the operator based on the workpiece's testing accuracy and its own structure, and then entered into the system. It is directly read during use.

[0044] If the actual internal pressure is not less than the test internal pressure, it means that the gas pressure in the closed space between the workpiece cavity and the vent pipe 322 has reached the standard test pressure, and pressure drop detection can be carried out. At this time, the inflation is stopped. A one-way valve is installed in the vent pipe 322, which only allows gas to move from the side of the vent pipe 322 away from the workpiece to the side closer to the workpiece. Part of the space in the vent pipe 322 and the workpiece cavity form an integral closed space. The air pressure sensor is set in this space and can continuously detect changes in air pressure.

[0045] S12: Determine the first pressure drop rate based on the actual change in internal pressure.

[0046] The first pressure drop rate refers to the actual decrease in internal pressure per unit time under the condition that the workpiece is pressed tightly against the tooling and the internal air pressure is stable. The actual internal pressure is continuously collected and the fluctuation period at the beginning of the time period is removed. The actual internal pressure is collected from the beginning of the pressure stabilization to the end of the unit time. The first pressure drop rate is calculated by quotienting the difference between the two actual internal pressures with the unit time.

[0047] S13: When the first pressure drop rate is greater than the preset leakage threshold, it is determined to be a leaking component.

[0048] The leakage threshold is the critical pressure drop rate standard value that distinguishes whether a workpiece has a leak. The leakage threshold is obtained through multiple sample airtightness simulation experiments. Operators obtain and enter the information into the system in advance, and then read it directly when needed.

[0049] If the first pressure drop rate is greater than the leakage threshold, it means that the gas inside the workpiece is flowing out rapidly, indicating that there is a leak in the workpiece.

[0050] Leaking parts refer to rearview mirror components with gaps that allow gas leakage.

[0051] S14: Drive the preset clamping structure 22 to switch the workpiece's downward pressure state, and re-inflate so that the actual internal pressure is not less than the test internal pressure.

[0052] The clamping structure 22 refers to the rotary clamping cylinder, which is the clamping structure 22 in a car rearview mirror side turn light sealing test device. It has two pressing states: the first execution state, which fully clamps the workpiece into the mounting seat 21, and the second execution state, which lifts the cylinder upward to release pressure. During the test, the clamping structure 22 first uses the first execution state. After determining that the current workpiece is a leaking part, it will switch to the second execution state.

[0053] The pressing state refers to the state of the workpiece when the pressing structure 22 is in one of the two execution states. When the pressing structure 22 is in the first execution state, the workpiece is completely pressed down into the mounting base 21, and the bottom of the workpiece is in close contact with the support protrusion 215 on the mounting base 21. When the pressing structure 22 is in the second execution state, the workpiece is placed on the mounting base 21. The pressing state of the current workpiece can be directly matched according to the current state of the pressing structure 22. At this time, the pressing structure 22 is switched to the second execution state, and air is injected into the workpiece again so that the actual internal pressure is not less than the test internal pressure.

[0054] S15: Re-determine the second pressure drop rate based on the current actual internal pressure change.

[0055] The second pressure drop rate refers to the actual decrease in internal pressure per unit time when the clamping structure 22 is lifted, the bottom of the workpiece is not forcibly sealed, and the internal air pressure is stable; it is obtained in the same way as the first pressure drop rate.

[0056] S16: Determine the location of the leak by comparing the changes in the first and second pressure drop rates.

[0057] The location of the leak refers to the area where the leak point is located on the leaking component, including three types: leaking only on the side, leaking only at the bottom, and leaking on both the side and the bottom; the method for determining the location of the leak will be disclosed in detail in subsequent steps.

[0058] S17: Classify and cut materials based on different leakage locations.

[0059] The pre-set unloading equipment grabs the workpieces into the corresponding material bins for sorting and unloading based on the different air leakage locations of the workpieces.

[0060] The method for determining the location of an air leak includes the following steps: S20: The pressure drop ratio is calculated by dividing the second pressure drop rate by the first pressure drop rate.

[0061] The pressure drop ratio is the ratio of the second pressure drop rate to the first pressure drop rate; the pressure drop ratio is calculated by taking the quotient of the second pressure drop rate and the first pressure drop rate.

[0062] S210: If the pressure drop ratio is not greater than the preset ratio threshold, the leak location is determined to be only a side leak.

[0063] The ratio threshold is a critical multiple benchmark for determining whether gas leakage in a workpiece is affected by the bottom sealing condition. The critical multiple is calibrated in advance by the operator through multiple simulation comparison experiments and entered into the system. It is directly read when used. In this embodiment, it is directly set to 1.

[0064] If the pressure drop ratio is not greater than the ratio threshold, it means that the gas leakage of the current workpiece is not related to the sealing status at the bottom, which indicates that the leak point of the workpiece is only on the side.

[0065] Side-only leakage refers to the leakage location of a workpiece when the leakage point is only distributed on the side wall or side joint of the workpiece. The pressure drop ratio is compared with the ratio threshold. If the pressure drop ratio is not greater than the ratio threshold, the leakage location is determined to be side-only leakage.

[0066] S211: If the pressure drop ratio is greater than the ratio threshold, the corresponding workpiece is transferred to the preset re-inspection equipment for re-inspection, and the bottom of the workpiece is sealed and fitted with the re-inspection equipment.

[0067] If the pressure drop ratio is greater than the ratio threshold, it means that the gas leakage of the current workpiece is related to the sealing status at the bottom, which indicates that there must be a leak at the bottom of the workpiece.

[0068] The re-inspection equipment is the same as the overall structure of a car rearview mirror side turn light sealing test device, except that the setting of the support protrusion 215 is reduced. When the workpiece is placed in the mounting seat 21, the bottom of the workpiece can be completely sealed with the mounting seat 21, and there will be no gas leakage from the bottom.

[0069] S212: Inflate the workpiece with air and collect the internal pressure for retest until the retest internal pressure is not less than the test internal pressure, then stop inflating.

[0070] The re-inspection internal pressure refers to the real-time detection air pressure in the inner cavity of the workpiece when it is placed in the re-inspection equipment and continuously inflated; it is obtained in real time by the air pressure sensor that is pre-installed in the air pipe 322 of the re-inspection equipment.

[0071] S213: Determine the third pressure drop rate based on the change in internal pressure during re-inspection.

[0072] The third pressure drop rate refers to the actual decrease in internal pressure per unit time when the bottom of the workpiece is in contact with the re-inspection equipment to achieve a sealed condition and the internal air pressure is stable; it is obtained in the same way as the first pressure drop rate.

[0073] S2140: When the third pressure drop rate is greater than the leakage threshold, it is determined that there is leakage on both the side and bottom.

[0074] If the third pressure drop rate is greater than the leakage threshold, it means that the workpiece is still leaking under the current working conditions. This indicates that there is also a leak on the side of the workpiece. Based on the previous judgment, the leak location of the workpiece is determined to be that there is a leak on both the side and the bottom.

[0075] "Side and bottom leakage" refers to the leakage points of a workpiece that are simultaneously distributed on the side wall, side joint, and bottom of the workpiece. The third pressure drop rate is compared with the leakage threshold. When the third pressure drop rate is greater than the leakage threshold, the leakage location is determined to be "side and bottom leakage".

[0076] S2141: When the third pressure drop rate is not greater than the leakage threshold, it is determined that there is only bottom leakage.

[0077] If the third pressure drop rate is not greater than the leakage threshold, it means that there is no air leakage in the workpiece under the current working conditions. This indicates that there is no leakage point on the side of the workpiece. Combined with the previous judgment, it is concluded that the leakage location of the workpiece is only at the bottom.

[0078] Bottom-only leakage means that the leakage point of the workpiece is only distributed at the bottom of the workpiece; when the third pressure drop rate is not greater than the leakage threshold, the leakage location is determined to be bottom-only leakage.

[0079] After determining the location of the leak, the following steps are included: S30: Match the stamping depth and material feeding position according to the location of the air leak.

[0080] The stamping depth refers to the standard indentation of different depths matched based on different air leakage locations; it is preset by the operator. For example, when only the bottom is leaking air, the stamping head 41 is controlled to squeeze out an indentation of 1 mm; when only the side is leaking air, the stamping head 41 is controlled to squeeze out an indentation of 2 mm; and when both the side and the bottom are leaking air, the stamping head 41 is controlled to squeeze out an indentation of 3 mm.

[0081] The material unloading location refers to the dedicated material hopper channel location corresponding to different leaking parts. The operator sets the location in advance and matches the coordinates of the material hopper location corresponding to the leaking location, and enters the matching table into the system. The system directly matches the material unloading location based on the leaking location.

[0082] S31: Obtain the workpiece hardness corresponding to the workpiece, and obtain the preset stamping head 41 stamping head hardness and tip wear degree.

[0083] Workpiece hardness refers to the quantitative parameter of the hardness of the outer surface of the workpiece; the operator uses a hardness tester to detect the hardness value of the corresponding workpiece in advance and enters it into the system, which can be directly read when needed.

[0084] The hardness of the punch refers to the fixed reference hardness of the raw material of the punch 41. The operator uses a hardness tester to detect the hardness value of the corresponding punch 41 in advance and enters it into the system. It can be directly read when in use.

[0085] Tip wear refers to the numerical value that quantifies the degree of blunting of the tip of the stamp 41. The larger the value, the more severe the blunting of the tip of the stamp 41. When a brand new stamp 41 is used for the first time, the corresponding tip wear is set to 0. The tip wear is calculated and updated after each stamping action.

[0086] S32: Determine the force of the control stamp 41 by combining the stamping depth, workpiece hardness, tip wear, and stamp head hardness.

[0087] The execution force refers to the extrusion force required to drive the stamping head 41 to slide and press against the workpiece surface to achieve the stamping depth. The deeper the stamping depth and the higher the hardness of the workpiece, the greater the total pressure required. The greater the wear of the tip, the larger the contact surface of the tip arc. Under the same pressure, the pressure decreases, and the total pressure required is greater. The higher the hardness of the stamping head, the smaller the total pressure required under the same working conditions. The operator pre-corrects the execution force relationship based on the above four parameters, matches the corresponding appropriate execution force for different parameters through a preset fitting calculation model, and integrates the relationship to obtain a corresponding table. When using, the corresponding execution force can be directly read from the corresponding table based on the above four parameters.

[0088] S33: Based on the execution force control, the stamp 41 squeezes the outer wall of the workpiece to form a dent mark and updates the tip wear, and then controls the workpiece to be unloaded based on the unloading position.

[0089] The control of the stamp 41 includes the following steps: S40: Collect the actual depth of the current stamp head 41.

[0090] The actual depth of the puncture is the depth to which the tip of the puncture head 41 is pressed into the outer wall of the workpiece after a single extrusion action. The sliding shaft of the puncture head 41 is equipped with a high-precision linear displacement sensor. During the process of the puncture head 41 sliding and extruding towards the workpiece, the displacement sensor collects the feed displacement of the puncture head 41 in real time. The actual depth of the puncture is obtained by subtracting the preset distance between the puncture head 41 and the workpiece from the feed displacement.

[0091] S41: Determine the wear increment by combining the stamping depth and the stamping depth.

[0092] Wear increment refers to the quantitative value of the additional blunt wear on the tip of the stamp 41 after a single stamping action; the depth difference is calculated by subtracting the stamping depth from the stamping depth, and the wear increment is calculated by combining the depth difference with the preset wear conversion coefficient.

[0093] The wear conversion coefficient is obtained by the operator in advance based on multiple experimental calibrations and entered into the system. It is directly read when in use. Based on the same standard working conditions, the wear degree of the poker 41 is changed and the corresponding depth difference is obtained. The wear conversion coefficient is obtained by matching the depth difference with the wear degree.

[0094] S42: Calculate the sum of the wear increment and the tip wear, and replace the updated tip wear with the result.

[0095] S43: When the tip wear is not less than the preset wear threshold, a prompt to replace the poker 41 is issued.

[0096] The wear threshold refers to the maximum critical wear value that the stamp 41 is allowed to passivate. The limit wear value, i.e. the wear threshold, is determined by batch durability tests of the stamp 41. It is obtained in advance by the operator and entered into the system, and can be directly read when in use.

[0097] The durability batch test of the 41 stamp head involves using a brand-new 41 stamp head with various workpieces for cyclic marking, collecting pressure and stamping depth data, fitting the force formula coefficient, calibrating the wear threshold and force limit, and providing experimental basis for adaptive pressure calculation.

[0098] If the tip wear is not less than the wear threshold, it means that the current stamp 41 has reached its service limit and needs to be replaced.

[0099] The "Stamp Head 41 Replacement Prompt" refers to a dual alarm signal (audio-visual and visual) that reminds the operator to stop the machine and replace the stamp head 41. When the system determines that the tip wear is not less than the wear threshold, it will automatically issue a stamp head 41 replacement prompt.

[0100] The steps involved in collecting the actual internal pressure of a workpiece are as follows: S50: Obtain the internal cavity volume of the sealed part of the workpiece, the connection volume of the connection section between the air supply device and the workpiece, and the inflation rate for performing inflation.

[0101] The internal cavity volume refers to the total volume of the sealed cavity inside the workpiece. The standard internal cavity volume of each type of workpiece is pre-calibrated by the operator based on the three-dimensional model of the workpiece and then pre-entered into the system.

[0102] The connection volume refers to the total volume of the pipe between the one-way valve and the contact detection port in the vent pipe 322; the connection volume is measured in advance by the operator using the drainage method or other methods and then entered into the system.

[0103] The inflation rate refers to the volume of gas output by the gas supply equipment into the vent pipe 322 per unit time. The cross-sectional area of ​​the vent pipe 322 is measured in advance by the operator and the inflation rate is matched accordingly. At the current inflation rate, the gas in the vent pipe 322 can flow quickly and smoothly into the workpiece.

[0104] S51: Determine the standard inflation time for the workpiece to reach the test internal pressure by combining the internal cavity volume, connection volume, inflation rate, and test internal pressure.

[0105] The standard inflation time refers to the theoretical time required to pressurize the entire assembly of the vent pipe 322 and the workpiece to the test internal pressure under theoretical conditions. The standard inflation time is calculated using the following formula: , V 总 For the uncompensated and corrected required inflation volume, V 内腔 V is the volume of the cavity. 连接 For connecting volumes, P 测 To test the internal pressure, P 常压 Where is standard atmospheric pressure, Q is the inflation rate, and K is the inflation rate. 补偿 K is the compensation coefficient for pipeline resistance and airflow disturbance. 补偿 These are constants obtained from experimental calibration.

[0106] S52: Obtain the actual inflation time when the actual internal pressure is not less than the test internal pressure.

[0107] If the actual internal pressure is not less than the test internal pressure, it means that the actual internal pressure in the pipeline where the pressure sensor is located has reached the test internal pressure, and inflation needs to be stopped.

[0108] The actual inflation time refers to the total inflation time from the start of inflation until the actual internal pressure is not less than the test internal pressure. Timing starts the moment the inflation start signal is output, and stops immediately when the actual internal pressure collected by the air pressure sensor is not less than the test internal pressure. The accumulated timing time is the actual inflation time.

[0109] S53: If the actual inflation time is less than the standard inflation time, it is determined to be an alignment deviation and inflation is stopped.

[0110] If the actual inflation time is less than the standard inflation time, it means that the target volume of gas has not yet been introduced into the vent pipe 322 and the workpiece. However, the air pressure at the location of the air pressure sensor has already reached the test internal pressure, indicating that the gas flow between the vent pipe 322 and the workpiece is not smooth enough, and a large amount of gas remains in the vent pipe 322. This means that there is a positional misalignment between the vent pipe 322 and the test port of the workpiece, and inflation needs to be stopped. Otherwise, the pressure in the vent pipe 322 will be too high.

[0111] S54: Determine the fourth pressure drop rate based on the actual change in internal pressure.

[0112] The fourth pressure drop rate refers to the pressure drop per unit time in the inner cavity of the workpiece during the pressure stabilization stage under workpiece misalignment conditions; it is obtained in the same way as the first pressure drop rate.

[0113] S55: Determine the offset type based on the fourth pressure drop rate and make corresponding classification adjustments.

[0114] The offset type refers to the level of blockade offset classified according to the fourth pressure drop rate, which is divided into two categories: severe blockade offset and slight blockade offset. The method for determining the offset type will be disclosed in detail in subsequent steps.

[0115] After determining the fourth pressure drop rate, the following steps are included: S60: If the fourth pressure drop rate is not greater than the preset pressure drop threshold, the offset type is determined to be severe blockage offset, and an immediate adjustment alarm is issued.

[0116] The pressure drop threshold refers to the critical pressure drop rate that distinguishes between severe and slight sealing deviation. By simulating airtightness testing with batches of qualified and leaking workpieces, the stable pressure drop rate of each group of workpieces is collected, the critical value that distinguishes between good and defective products is determined, and the pressure drop threshold is stored in the controller as a criterion for identifying the degree of sealing deviation.

[0117] If the fourth pressure drop rate is not greater than the pressure drop threshold, it means that the flow rate of gas from the vent pipe 322 to the inside of the workpiece is very small, resulting in a very slow pressure drop. This indicates that the vent pipe 322 is seriously misaligned with the detection port of the workpiece, which is judged as a serious blockage misalignment.

[0118] Severe blockage and misalignment refers to a serious misalignment between the vent pipe 322 and the workpiece's detection port, preventing the gas in the vent pipe 322 from flowing normally into the workpiece, making subsequent leak detection difficult, and requiring immediate shutdown for maintenance.

[0119] Immediate adjustment alarm refers to a high-priority continuous audible and visual alarm that forces the operator to stop the machine and adjust the position of the workpiece or the vent pipe 322. After a serious blockage or displacement is determined, the system continuously outputs a drive signal, and the audible and visual alarm works uninterrupted until it is manually reset.

[0120] S61: If the fourth pressure drop rate is greater than the pressure drop threshold, the offset type is determined to be slight blockage offset, and a delay adjustment alarm is issued.

[0121] If the fourth pressure drop rate is greater than the pressure drop threshold, it means that the gas in the vent pipe 322 can slowly flow into the workpiece. This indicates that there is a slight offset between the vent pipe 322 and the detection port of the workpiece, which is determined to be a slight blockage offset.

[0122] Slight blockage offset refers to a slight misalignment between the vent pipe 322 and the workpiece's detection port. The gas in the vent pipe 322 can slowly flow into the workpiece, and a maintenance reminder can be issued after the current detection is completed.

[0123] The delayed adjustment alarm refers to a low-priority intermittent audible and visual prompt that reminds the operator to adjust the tooling after the current workpiece completes the inspection process; after a slight blockage deviation is detected, the system delays for a preset fixed duration before outputting an intermittent audible and visual drive signal to achieve a delayed prompt.

[0124] S62: Determine the actual inflation volume based on the actual inflation time and inflation rate, and determine the required inflation volume based on the internal cavity volume, connection volume, and test internal pressure.

[0125] The actual inflation volume refers to the total volume of gas output by the gas supply equipment during the entire inflation process; the actual inflation volume is calculated by multiplying the actual inflation time and inflation rate.

[0126] The required inflation volume refers to the total volume of gas required to pressurize the workpiece cavity and the vent pipe 322 to the theoretical test internal pressure. The uncompensated required inflation volume is calculated by substituting the cavity volume, connection volume, and test internal pressure into the formula. The calculation formula has been disclosed in the method for obtaining the standard inflation time. The required inflation volume is then calculated by multiplying the uncompensated required inflation volume with the compensation coefficient of pipeline resistance and airflow disturbance.

[0127] S63: Determine the inflation volume difference by combining the actual inflation volume and the required inflation volume.

[0128] The inflation volume difference refers to the difference between the theoretical required inflation volume and the actual inflation volume. The inflation volume difference is calculated by subtracting the required inflation volume from the actual inflation volume.

[0129] S64: Gas is supplied to the interior of the workpiece based on the difference in gas volume.

[0130] The method for gas replenishment includes the following steps: S70: Determine the rate of change of pressure volume in the connecting section per unit time based on the fourth pressure drop rate and the connecting volume.

[0131] The rate of change refers to the total change in pressure volume of the pipeline connection section per unit time; the rate of change is calculated by multiplying the fourth pressure drop rate with the connection volume.

[0132] S71: Collect and detect the ambient temperature and match the conversion factor.

[0133] Ambient temperature refers to the real-time air temperature of the workstation; the ambient temperature is obtained in real time through a temperature sensor pre-installed on the side of the mounting seat 21.

[0134] The conversion factor is a correction factor used to compensate for the influence of ambient temperature on gas pressure and volume. The corresponding conversion factor is read from the coefficient correspondence table based on the ambient temperature. The coefficient correspondence table records the correspondence between different ambient temperatures and their corresponding conversion factors. Based on the ideal gas equation, standard operating conditions are set, and constant temperature calibration tests are carried out in segments with different ambient temperatures. The pressure deviation corresponding to each temperature is measured, and the temperature correction conversion factor is calculated in reverse. The temperature and its corresponding coefficient are then compiled into a table to obtain the temperature correspondence table.

[0135] S72: Determine the air supply rate to maintain pressure balance in the connecting section by combining the rate of change and the conversion factor.

[0136] The gas replenishment rate refers to the gas flow rate per unit time required to maintain the pressure balance between the pipeline and the workpiece cavity. It is also the flow rate of gas flowing into the workpiece per unit time in the vent pipe 322 under the current working conditions. The gas replenishment rate is calculated by multiplying the rate of change with the conversion factor.

[0137] S73: Calculate the required inflation time based on the inflation rate and the difference in inflation volume.

[0138] The inflation time refers to the continuous inflation time required to make up the difference in inflation volume at the calculated inflation rate; the inflation time is calculated by quotienting the difference in inflation volume with the inflation rate.

[0139] S74: Control the gas supply equipment to fill the workpiece with gas based on the gas replenishment rate and gas replenishment duration.

[0140] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A method for testing the sealing performance of a car rearview mirror side turn signal, characterized in that, include: S10: In response to the detection signal, control the preset air supply device to inflate the workpiece with air and collect the actual internal pressure inside the workpiece. S11: Stop inflation when the actual internal pressure is not less than the preset test internal pressure; S12: Determine the first pressure drop rate based on the actual internal pressure change. S13: When the first pressure drop rate is greater than the preset leakage threshold, it is determined to be a leaking component; S14: Drive the preset clamping structure (22) to switch the workpiece's pressing state and re-inflate so that the actual internal pressure is not less than the test internal pressure; S15: Re-determine the second pressure drop rate based on the current actual internal pressure change. S16: Determine the location of the leak by comparing the changes in the first pressure drop rate and the second pressure drop rate; S17: Classify and cut materials based on different leakage locations.

2. The method for testing the sealing performance of a car rearview mirror side turn signal according to claim 1, characterized in that, Methods for determining the location of an air leak include: S20: The pressure drop ratio is calculated by dividing the second pressure drop rate by the first pressure drop rate; S210: If the pressure drop ratio is not greater than the preset ratio threshold, the leak location is determined to be only a side leak; S211: If the pressure drop ratio is greater than the ratio threshold, the corresponding workpiece will be transferred to the preset re-inspection equipment for re-inspection, and the bottom of the workpiece will be sealed and fitted with the re-inspection equipment. S212: Inflate the workpiece with air and collect the internal pressure for retest until the retest internal pressure is not less than the test internal pressure, then stop inflating. S213: Determine the third pressure drop rate based on the change in internal pressure during re-inspection; S2140: When the third pressure drop rate is greater than the leakage threshold, it is determined that there is leakage at both the side and bottom. S2141: When the third pressure drop rate is not greater than the leakage threshold, it is determined that there is only bottom leakage.

3. The method for testing the sealing performance of a car rearview mirror side turn signal according to claim 2, characterized in that, After determining the location of the leak, the following should be included: S30: Match the stamping depth and material feeding position according to the location of the air leak; S31: Obtain the workpiece hardness corresponding to the workpiece, and obtain the preset stamp hardness and tip wear of the stamp (41); S32: Determine the force of the control stamp (41) by combining the stamping depth, workpiece hardness, tip wear and stamp hardness; S33: Based on the execution force control, the puncture head (41) squeezes the outer wall of the workpiece to form a dent mark and updates the tip wear, and then controls the workpiece to be unloaded based on the unloading position.

4. The method for testing the sealing performance of a car rearview mirror side turn signal according to claim 3, characterized in that, When the control stamp (41) is executed, it includes: S40: Collect the actual depth of the current stamp (41) being pressed in; S41: Determine the wear increment by combining the stamping depth and the stamping depth; S42: Calculate the sum of the wear increment and the tip wear, and replace the updated tip wear with the result; S43: When the tip wear is not less than the preset wear threshold, issue a prompt to replace the poker (41).

5. The method for testing the sealing performance of a car rearview mirror side turn signal according to claim 1, characterized in that, When collecting the actual internal pressure of a workpiece, the following should be included: S50: Obtain the internal sealed cavity volume of the workpiece, the connection volume of the connection section between the air supply device and the workpiece, and the inflation rate for performing inflation. S51: Determine the standard inflation time for the workpiece to reach the test internal pressure by combining the internal cavity volume, connection volume, inflation rate and test internal pressure. S52: Obtain the actual inflation time when the actual internal pressure is not less than the test internal pressure; S53: If the actual inflation time is less than the standard inflation time, it is determined to be an alignment misalignment and inflation is stopped; S54: Determine the fourth pressure drop rate based on the actual internal pressure change. S55: Determine the offset type based on the fourth pressure drop rate and make corresponding classification adjustments.

6. The method for testing the sealing performance of a car rearview mirror side turn signal according to claim 5, characterized in that, After determining the fourth pressure drop rate, the following is included: S60: If the fourth pressure drop rate is not greater than the preset pressure drop threshold, the offset type is determined to be severe blockage offset, and an immediate adjustment alarm is issued; S61: If the fourth pressure drop rate is greater than the pressure drop threshold, the offset type is determined to be slight blockage offset, and a delay adjustment alarm is issued; S62: Determine the actual inflation volume based on the actual inflation time and inflation rate, and determine the required inflation volume based on the inner cavity volume, connection volume and test internal pressure; S63: Determine the inflation volume difference by combining the actual inflation volume and the required inflation volume; S64: Gas is supplied to the interior of the workpiece based on the difference in gas volume.

7. A method for testing the sealing performance of a car rearview mirror side turn signal according to claim 6, characterized in that, Methods for gas replenishment include: S70: Determine the rate of change of pressure volume in the connecting section per unit time based on the fourth pressure drop rate and the connecting volume; S71: Collect and detect the ambient temperature and match the conversion factor; S72: Determine the air supply rate to maintain pressure balance in the connecting section by combining the rate of change and the conversion factor; S73: Calculate the required inflation time based on the inflation rate and the difference in inflation volume; S74: Control the gas supply equipment to fill the workpiece with gas based on the gas replenishment rate and gas replenishment duration.

8. A device for detecting the sealing performance of a car rearview mirror side turn signal, controlled by a method for detecting the sealing performance of a car rearview mirror side turn signal as described in any one of claims 1 to 7, characterized in that, It includes a fixing component (2) and a sealing detection component (3); the fixing component (2) includes a mounting seat (21) for accommodating the workpiece and a clamping structure (22) for pressing and fixing the workpiece on the mounting seat (21). The mounting base (21) has a support protrusion (215) on the side near the workpiece. The support protrusion (215) is provided in a plurality of numbers and is evenly distributed on the mounting base (21). The support protrusion (215) is used to support the workpiece and form a pressure relief channel under the workpiece during the testing process.

9. A device for detecting the sealing performance of a car rearview mirror side turn signal according to claim 8, characterized in that, The sealing detection component (3) includes a sealing block (31), a detection structure (32), and a pushing structure (33). The sealing block (31) is used to seal and fit the outside of the workpiece detection port. The detection structure (32) is used to pressurize the inside of the workpiece through the detection port for detection. The pushing structure (33) is used to drive the sealing block (31) and the detection structure (32) closer to or further away from the workpiece.

10. A device for detecting the sealing performance of a car rearview mirror side turn signal according to claim 8, characterized in that, It also includes a puncture head (41) that slides in a direction close to or away from the workpiece, and the end of the puncture head (41) facing the workpiece is set in a pointed cone shape to press the outer wall of the workpiece to form an indentation mark.

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