Shell closing process monitoring method and buckling monitoring equipment

Abstract

The invention discloses a shell closing process monitoring method and buckling monitoring equipment, and relates to the technical field of assembly process monitoring, and the shell closing process monitoring method comprises the steps: obtaining a displacement value and a pressure value correspondingly detected by a displacement sensor and a pressure sensor in real time on the abutting stroke of an abutting part; according to the displacement value and the pressure value obtained in real time, an actual pressure-displacement curve is generated; and comparing the actual pressure displacement curve with a theoretical pressure displacement curve to judge whether the state of the buckling shell is abnormal or not. According to the technical scheme provided by the invention, the actual pressure displacement curve is obtained according to the displacement and the stress condition of the component during assembly, and then the actual pressure displacement curve is compared with the theoretical pressure displacement curve to analyze whether an abnormal condition exists or not; therefore, the assembling condition between two parts which are matched with each other through the buckle can be detected and monitored.

Description

Technical Field

[0001] This invention relates to the field of assembly process monitoring technology, and in particular to a method for monitoring the shell assembly process and a fastening monitoring device. Background Technology

[0002] In the structural design of products in the consumer electronics and automotive electronics industries, snap-fit ​​fastening is increasingly being adopted because it eliminates the need for additional connectors, directly saving on the procurement, inventory, and management costs of fasteners (such as screws), while also offering a high level of aesthetic appeal and reliability.

[0003] Traditional assembly relies on the worker's touch or sound, which cannot be quantified or monitored during the locking and unlocking process, and it is impossible to confirm whether the lock is engaged. Furthermore, it is impossible to detect abnormalities such as breakage, whitening, or permanent deformation of the lock or its mating parts (e.g., housing) under excessive assembly force due to the force applied during the locking and unlocking process. Summary of the Invention

[0004] The main objective of this invention is to provide a method for monitoring the assembly process and a fastening monitoring device, which aims to monitor the assembly status between two components that are engaged by fasteners.

[0005] To achieve the above objectives, the present invention proposes a shell-closing process monitoring method, applied to a snap-fit ​​monitoring device. The snap-fit ​​monitoring device includes a drive unit, a pressure sensor, and a stop top connected sequentially from top to bottom. The drive unit drives the stop top downwards to press and close the shell. The snap-fit ​​monitoring device also includes a control device. A displacement sensor is used to detect the displacement of the abutment top. The control device is electrically connected to the drive unit, the pressure sensor, and the displacement sensor respectively. The method for monitoring the shell closure process includes: During the top-reaching stroke, the displacement and pressure values ​​detected by the displacement and pressure sensors are acquired in real time. Based on the real-time displacement and pressure values, an actual pressure-displacement curve is generated; The actual pressure-displacement curve is compared with the theoretical pressure-displacement curve to determine whether the snap-fit ​​shell is in an abnormal state.

[0006] In one embodiment, the pressure-displacement curve has a curve endpoint corresponding to the end position of the jacking stroke; The step of comparing the actual pressure-displacement curve with the theoretical pressure-displacement curve to determine whether the engagement state of the locking shell is abnormal includes: Obtain the actual endpoint displacement value corresponding to the endpoint of the actual pressure-displacement curve; Calculate the displacement difference between the actual endpoint displacement value and the theoretical endpoint displacement value corresponding to the endpoint of the theoretical pressure-displacement curve; Based on the displacement difference, it is determined whether the snap-fit ​​shell is properly assembled.

[0007] In one embodiment, the step of determining whether the fastening shell is properly assembled based on the displacement difference includes: The absolute value of the displacement difference is compared with a first set value; When the absolute value of the displacement difference is less than or equal to the first set value, it is determined that the snap-fit ​​shell is assembled in place; When the absolute value of the displacement difference is greater than the first set value, it is determined that the fastening shell is not properly assembled.

[0008] In one embodiment, the abutting stroke includes a locking stroke segment; The step of comparing the actual pressure-displacement curve with the theoretical pressure-displacement curve to determine whether the engagement state of the locking shell is abnormal includes: Obtain the actual pressure-displacement curve and the actual locking curve segment corresponding to the locking stroke segment, as well as the theoretical pressure-displacement curve and the theoretical locking curve segment corresponding to the locking stroke segment; The actual locking curve segment is graphically matched with the theoretical locking curve segment to determine the buckle deformation recovery of the snap-fit ​​shell.

[0009] In one embodiment, the abutting stroke includes a locking stroke segment; The step of comparing the actual pressure-displacement curve with the theoretical pressure-displacement curve to determine whether the engagement state of the locking shell is abnormal includes: Obtain the actual engagement curve segment corresponding to the actual pressure-displacement curve and the engagement stroke segment, and the theoretical engagement curve segment corresponding to the theoretical pressure-displacement curve and the engagement stroke segment; The actual engagement curve segment is compared with the theoretical engagement curve segment, and the quality of the engagement structure of the engagement shell is determined based on the comparison result.

[0010] In one embodiment, the step of comparing the actual engagement curve segment with the theoretical engagement curve segment and determining the quality of the engagement structure of the fastening shell based on the comparison result includes: Obtain the actual maximum pressure value F1 corresponding to the end point of the actual engagement curve segment, and the theoretical maximum pressure value F2 corresponding to the end point of the theoretical engagement curve segment; Calculate the difference between F1 and F2; When the difference between F1 and F2 is less than the second set value, it is determined that the buckle of the fastening shell is broken or too small. When the difference between F1 and F2 is greater than the third set value, it is determined that the fastening shell has burrs, dimensional interference, or is designed to be too tight.

[0011] In one embodiment, the step of comparing the actual engagement curve segment with the theoretical engagement curve segment and determining the quality of the engagement structure of the fastening shell based on the comparison result includes: Obtain the actual slope of the actual engagement curve segment and the theoretical slope of the theoretical engagement curve segment; Compare the actual slope with the theoretical slope; Based on the comparison results, the quality status of the snap-fit ​​shell is determined.

[0012] In one embodiment, the engagement stroke segment has a first stroke segment and a second stroke segment arranged sequentially along the top stroke; the actual slope includes a first actual slope corresponding to the first stroke segment and a second actual slope corresponding to the second stroke segment; the theoretical slope includes a first theoretical slope corresponding to the first stroke segment and a second theoretical slope corresponding to the second stroke segment. The step of determining the quality status of the fastening shell based on the comparison results includes: When either of the following conditions is met: the absolute value of the difference between the first actual slope and the first theoretical slope is greater than a fourth set value, or the absolute value of the difference between the second actual slope and the second theoretical slope is greater than a fifth set value, the fastening shell guide structure is determined to be abnormal or the placement is abnormal.

[0013] The present invention also proposes a fastening monitoring device, comprising: The fastening and abutting device has a driving part and an abutting part, wherein the driving part drives the abutting part to move, so that the abutting part has an abutting stroke for abutting against the fastening shell; A displacement sensor is used to detect the displacement of the abutment top. A pressure sensor is used to detect the force applied to the abutment. The control device is electrically connected to the displacement sensor, the pressure sensor, and the drive unit; and, The control program for the engagement monitoring device is stored on the control device and can be run on the control device, the engagement monitoring device control program being configured as the steps of the shell closure process monitoring method; The shell closure process monitoring method includes: During the top-reaching stroke, the displacement and pressure values ​​detected by the displacement and pressure sensors are acquired in real time. Based on the real-time displacement and pressure values, an actual pressure-displacement curve is generated; The actual pressure-displacement curve is compared with the theoretical pressure-displacement curve to determine whether the snap-fit ​​shell is in an abnormal state.

[0014] In one embodiment, the fastening monitoring device further includes: An alarm device is used to issue an alarm when an abnormality is detected in the locking housing. A display device is used to display the data corresponding to the fastening shell; The alarm device and the display device are both electrically connected to the control device.

[0015] The technical solution of the present invention obtains the actual pressure-displacement curve based on the displacement and stress of the components during assembly, and then compares the actual pressure-displacement curve with the theoretical pressure-displacement curve to analyze whether there are any abnormalities, thereby enabling the detection and monitoring of the assembly status between two components that are engaged by snap fasteners. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a flowchart illustrating the first embodiment of the shell closure process monitoring method provided by the present invention; Figure 2 This is a flowchart illustrating the second embodiment of the shell closure process monitoring method provided by the present invention; Figure 3 This is a flowchart illustrating the third embodiment of the shell closure process monitoring method provided by the present invention; Figure 4 This is a flowchart illustrating the fourth embodiment of the shell closure process monitoring method provided by the present invention; Figure 5 This is a flowchart illustrating the fifth embodiment of the shell closure process monitoring method provided by the present invention; Figure 6 This is a flowchart illustrating the sixth embodiment of the shell closure process monitoring method provided by the present invention; Figure 7 This is a flowchart illustrating the seventh embodiment of the shell closure process monitoring method provided by the present invention. Figure 8 This is a flowchart illustrating the eighth embodiment of the shell closure process monitoring method provided by the present invention. Figure 9A schematic diagram of the theoretical pressure-displacement curve plotted using the shell-closing process monitoring method provided by the present invention; Figure 10 This is a schematic diagram of an embodiment of the fastening monitoring device provided by the present invention.

[0018] Explanation of icon numbers: 100. Snap-on monitoring equipment; 1. Snap-on abutting device; 11. Drive unit; 12. Abutting top; 2. Displacement sensor; 3. Pressure sensor; c. Snap-on stroke section; c1. First stroke section; c2. Second stroke section; d. Locking stroke section; e. Curve endpoint.

[0019] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0023] Traditional assembly relies on the worker's touch or sound, which cannot be quantified or monitored during the locking and unlocking process, and it is impossible to confirm whether the lock is engaged. Furthermore, it is impossible to detect abnormalities such as breakage, whitening, or permanent deformation of the lock or its mating parts (e.g., housing) under excessive assembly force due to the force applied during the locking and unlocking process.

[0024] This invention proposes a method for monitoring the shell closure process.

[0025] Please see Figure 1 and Figure 10 In one embodiment of the present invention, the shell-closing process monitoring method is applied to a snap-fit ​​monitoring device 100. The snap-fit ​​monitoring device 100 includes a drive unit 11, a pressure sensor 3, and a stop top 12 connected sequentially from top to bottom. The drive unit 11 drives the stop top 12 downward to press and close the shell. The snap-fit ​​monitoring device 100 also includes a control device and a displacement sensor 2. The displacement sensor 2 is used to detect the displacement of the stop top 12. The control device is electrically connected to the drive unit 11, the pressure sensor 3, and the displacement sensor 2 respectively. In order to utilize the fastening monitoring device 100 to monitor the assembly status between two parts that are engaged by fasteners, refer to Figure 1 , Figure 1 This is a flowchart illustrating a first embodiment of a shell-joining process monitoring method according to the present invention. The shell-joining process monitoring method includes: Step S1: During the top stroke of the top 12, the displacement value and pressure value detected by the displacement sensor 2 and pressure sensor 3 are acquired in real time. Step S2: Generate the actual pressure-displacement curve based on the real-time displacement and pressure values; Step S3: Compare the actual pressure-displacement curve with the theoretical pressure-displacement curve to determine whether the snap-fit ​​shell is in an abnormal state.

[0026] In the technical solution of this invention, a pressure sensor 3 is disposed between the driving part 11 and the abutment part 12 of the fastening and abutting device 1. The driving part 11 can be an automatic driving component or a manual driving component. The pressure sensor 3 is used to detect the force on the abutment part 12. Since the forces are mutual, the abutment part 12 and the fastening shell experience the same magnitude of force but opposite directions. The displacement sensor 2 is used to detect the moving distance of the fastening shell, thereby accurately obtaining the position information of the fastening shell. When the fastening movement is in the up-down direction, the height information of the fastening shell in the up-down direction can be obtained; when the fastening movement is in the left-right direction, the horizontal position information of the fastening shell in the left-right direction can be obtained.

[0027] The following explanation uses the interlocking action as an example, focusing on the vertical direction: Please refer to [link / reference needed]. Figure 9Initially, the two components that need to be interlocked are in contact but not actually locked together. The abutment 12 is above the locking shell but not in contact with it. Therefore, the abutment 12 is at its maximum height at this time, with zero force and zero displacement. At this point, the drive unit 11 pushes the abutment 12 downwards. Since the abutment 12 needs to descend a certain distance before contacting the locking shell, its displacement increases, its height decreases, and the force between it and the locking shell remains zero, corresponding to segment a of the pressure-displacement curve. When the abutment 12 and the locking shell come into contact, the force between them changes abruptly, corresponding to segment b of the pressure-displacement curve. Under the continuous force of the drive unit 11, the top 12 pushes the locking shell downwards synchronously. The locking structure deforms at this time. As the downward distance increases, the elastic deformation of the locking mechanism increases, and the elastic force of the locking mechanism gradually increases, opposing the force of the drive unit 11. Therefore, an increasingly larger force is required to act on the locking shell to overcome the increasing elastic force, causing the locking shell to press down and lock. This process corresponds to segment c of the pressure-displacement curve. When the locking structure exceeds its limit position, the locking mechanism can quickly recover its deformation, the elastic force decreases rapidly, and the force received by the locking shell as it presses down is also smaller. At this point, the height of the locking shell reaches its lowest point, and the displacement reaches its maximum. This process corresponds to segment d of the pressure-displacement curve.

[0028] The above describes the complete process of the locking shell engagement, corresponding to the theoretical pressure-displacement curve. When the engagement monitoring device 100 is used, the actual pressure-displacement curve is obtained. The two curves are compared, including comparisons of specific positions, values, and segments within the pressure-displacement curves. If discrepancies are found exceeding the allowable range, an abnormal engagement shell condition is inferred. Conversely, if the theoretical and actual pressure-displacement curves are comparable, a normal engagement shell condition is inferred.

[0029] Furthermore, embodiments of the present invention provide a method for monitoring the shell-closing process, referring to... Figure 2 , Figure 2 This is a flowchart illustrating a second embodiment of a shell-closing process monitoring method according to the present invention.

[0030] During the pressing process, the top abutment 12 needs to be pressed down to a certain stroke to ensure proper engagement. While an automatic drive unit (cylinder) can guarantee the correct stroke for each press, pressing according to the preset stroke can lead to product damage or even crushing if the product has quality issues or is improperly positioned, making it impossible to trace and analyze the cause. Therefore, the drive unit 11 is set as a manual drive unit (handle), requiring manual pressing of the handle for engagement. However, a problem with the manual drive unit is that the pressing stroke is uncertain each time. Therefore, it is necessary to detect the displacement distance of the top abutment 12 to prevent incomplete assembly due to insufficient stroke.

[0031] The pressure-displacement curve has a curve endpoint (point e) corresponding to the end position of the top stroke. Step S3 includes: Step S31: Obtain the actual endpoint displacement value corresponding to the endpoint of the actual pressure-displacement curve; Step S32: Calculate the displacement difference between the actual endpoint displacement value and the theoretical endpoint displacement value corresponding to the endpoint of the theoretical pressure-displacement curve; Step S33: Determine whether the snap-fit ​​shell is properly assembled based on the displacement difference.

[0032] The actual endpoint displacement corresponds to the total actual displacement length of the top 12; the theoretical endpoint displacement corresponds to the total theoretical displacement length of the top 12. The error between the actual and theoretical total displacement lengths is calculated by comparing the differences. A negative displacement difference indicates that the actual total displacement length is less than the theoretical total displacement length; a positive displacement difference indicates that the actual total displacement length is greater than the theoretical total displacement length.

[0033] Due to differences in product manufacturing processes, slight variations may occur during assembly. Therefore, this invention provides a method for monitoring the shell assembly process, referring to... Figure 3 , Figure 3 This is a flowchart illustrating a third embodiment of a shell-closing process monitoring method of the present invention.

[0034] Step S33 includes: Step S331: Compare the absolute value of the displacement difference with the first set value; Step S332: When the absolute value of the displacement difference is less than or equal to the first set value, it is determined that the fastening shell is assembled in place; Step S333: When the absolute value of the displacement difference is greater than the first set value, it is determined that the fastening shell is not properly assembled.

[0035] The larger the absolute value of the displacement difference, the greater the error between the actual total displacement length and the theoretical total displacement length. Errors within a certain range are permissible, but exceeding this range indicates a problem in the assembly process. This range is defined by a first set value. When the absolute value of the displacement difference is less than or equal to the first set value, the error is considered within the permissible range, and the snap-fit ​​shell is assembled correctly, meeting the qualification requirements. When the absolute value of the displacement difference is greater than the first set value, the error is considered to exceed the permissible range, and the snap-fit ​​shell is not assembled correctly.

[0036] There are many reasons why the locking housing might not be properly assembled. These could include situations where the latch fails to recover its elastic deformation after initial deformation, or a "false lock" situation. The locking mechanism is designed to determine whether the latch has recovered its elastic deformation.

[0037] Furthermore, embodiments of the present invention provide a method for monitoring the shell-closing process, referring to... Figure 4 , Figure 4 This is a flowchart illustrating the fourth embodiment of a shell-closing process monitoring method of the present invention.

[0038] In one embodiment, the abutting stroke includes a locking stroke segment, corresponding to segment d of the pressure-displacement curve; Step S3 includes: Step S34: Obtain the actual locking curve segment corresponding to the actual pressure displacement curve and the locking stroke segment, and the theoretical locking curve segment corresponding to the theoretical pressure displacement curve and the locking stroke segment; Step S35: Perform graphical matching between the actual locking curve segment and the theoretical locking curve segment to determine the buckle deformation recovery status of the fastening shell.

[0039] In the theoretical pressure-displacement curve, segment d corresponds to the first displacement interval. Then, in the actual pressure-displacement curve, it is checked whether the image contains a portion within the first displacement interval. If the actual pressure-displacement curve image does not contain a portion within the first displacement interval, it indicates that the latch has not undergone elastic deformation. If the actual pressure-displacement curve image contains a portion within the first displacement interval, but the displacement length is less than the displacement length corresponding to the theoretical locking curve segment, it is determined that the latch deformation has not been fully recovered.

[0040] In addition, the stress on the snap-fit ​​shell can be used to analyze any abnormalities in the assembly process and whether there are any quality problems with the snap-fit ​​shell.

[0041] Furthermore, embodiments of the present invention provide a method for monitoring the shell-closing process, referring to... Figure 5 , Figure 5 This is a flowchart illustrating the fifth embodiment of a shell-closing process monitoring method of the present invention.

[0042] In one embodiment, the abutting stroke includes an engagement stroke segment, corresponding to segment c of the pressure-displacement curve; Step S3 includes: Step S36: Obtain the actual engagement curve segment corresponding to the actual pressure-displacement curve and the engagement stroke segment, and the theoretical engagement curve segment corresponding to the theoretical pressure-displacement curve and the engagement stroke segment; Step S37: Compare the actual engagement curve segment with the theoretical engagement curve segment, and determine the quality of the engagement structure of the engagement shell based on the comparison result.

[0043] In the theoretical pressure-displacement curve, the engagement stroke segment, or segment c, corresponds to the second displacement interval. Then, in the actual pressure-displacement curve, a portion within the second displacement interval is extracted to obtain the actual engagement curve segment. By comparing the difference between the actual engagement curve segment and the theoretical engagement curve segment, it can be determined whether there are quality or assembly problems with the engagement shell.

[0044] Specifically, in one embodiment, the present invention provides a method for monitoring the shell closure process, referring to... Figure 6 , Figure 6 This is a flowchart illustrating the sixth embodiment of a shell-closing process monitoring method of the present invention.

[0045] In one embodiment, step S37 includes: Step S371: Obtain the actual maximum pressure value F1 corresponding to the end point of the actual engagement curve segment, and the theoretical maximum pressure value F2 corresponding to the end point of the theoretical engagement curve segment; Step S372: Calculate the difference between F1 and F2; Step S373: When the difference between F1 and F2 is less than the second set value, it is determined that the buckle of the fastening shell is broken or the size is too small; Step S374: When the difference between F1 and F2 is greater than the third set value, it is determined that the fastening shell has burrs, dimensional interference, or is designed to be too tight.

[0046] The maximum pressure value exists within the entire pressure-displacement curve segment during the engagement curve. By comparing this maximum pressure value, it can be determined whether there is a quality problem with the locking shell. The maximum pressure value F1 is obtained at the end of the actual engagement curve segment, and the theoretical maximum pressure value F2 is obtained at the end of the theoretical engagement curve segment. A second set value can be set to a negative number. When the difference between F1 and F2 is less than the second set value, it indicates a large difference between F1 and F2, and is much smaller than F2. This indicates low resistance during the pressing of the locking shell, meaning low elasticity of the latch. Therefore, it can be determined that the latch size is too small or the latch is broken. A third set value can be set to a positive number. When the difference between F1 and F2 is greater than the third set value, it indicates a large difference between F1 and F2, and is much larger than F2. This indicates high resistance during the pressing of the locking shell, meaning high elasticity of the latch. Therefore, it can be determined that the latch size is too large, there is dimensional interference, or the design is too tight.

[0047] Specifically, in another type of embodiment, the present invention further provides a method for monitoring the shell closure process, referring to... Figure 7 , Figure 7 This is a flowchart illustrating the seventh embodiment of a shell-closing process monitoring method of the present invention.

[0048] In one embodiment, step S37 includes: Step S375: Obtain the actual slope of the actual engagement curve segment and the theoretical slope of the theoretical engagement curve segment; Step S376: Compare the actual slope with the theoretical slope; Step S377: Determine the quality status of the snap-fit ​​shell based on the comparison results.

[0049] The interlocking curve segment may not be a straight line, making it impossible to directly calculate the slope. Methods for calculating the slope from the interlocking curve segment include: calculating based on the two endpoints of the two interlocking curve segments; or, taking a point from each segment of the interlocking curve segment to obtain multiple points, calculating a regression line from these multiple points, and using the slope of the regression line to represent the slope of the interlocking curve segment. Comparing the actual slope with the theoretical slope, a significant difference indicates a problem with the quality of the interlocking shell, likely due to a faulty guide structure or incorrect placement of parts.

[0050] During the deformation of the latch, the engagement curve segment may exhibit distinct slope segments due to the different stress points. Therefore, it is necessary to calculate and compare the slope of each segment. The following explanation uses a two-segment engagement stroke segment as an example.

[0051] Furthermore, embodiments of the present invention provide a method for monitoring the shell-closing process, referring to... Figure 8 , Figure 8 This is a flowchart illustrating the eighth embodiment of a shell-closing process monitoring method of the present invention.

[0052] In one embodiment, the engagement stroke segment has a first stroke segment and a second stroke segment arranged sequentially along the top stroke; the actual slope includes a first actual slope corresponding to the first stroke segment and a second actual slope corresponding to the second stroke segment; the theoretical slope includes a first theoretical slope corresponding to the first stroke segment and a second theoretical slope corresponding to the second stroke segment. The step of determining the quality status of the fastening shell based on the comparison results includes: Step S3771: When either of the following conditions is met: the absolute value of the difference between the first actual slope and the first theoretical slope is greater than a fourth set value, or the absolute value of the difference between the second actual slope and the second theoretical slope is greater than a fifth set value, it is determined that the fastening shell guide structure is abnormal or the placement is abnormal.

[0053] During the engagement stroke, each stroke segment is compared. If the difference in the comparison value of one segment is large, it indicates that the engagement shell guide structure is abnormal or the placement is abnormal.

[0054] In addition, the fastening and abutting device also includes a scanning device, which is used to scan the information of the fastening shell, bind and store the information of the fastening shell, the pressure displacement curve information, and various judgment results for traceability.

[0055] This invention also proposes a fastening monitoring device 100, which includes a fastening abutment device 1, a displacement sensor 2, a pressure sensor 3, and a control device, as well as a control program stored on the control device and capable of running on the control device to control the fastening monitoring device 100. The control program of the fastening monitoring device 100 is configured to provide the steps of the shell closing process monitoring method. The specific steps of the shell closing process monitoring method are as described in the above embodiments. Since this fastening monitoring device 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The fastening abutment device 1 has a driving part 11 and abutment top 12. The driving part 11 drives the abutment top 12 to move, so that the abutment top 12 has abutment stroke for abutting the fastening shell; the displacement sensor 2 is used to detect the abutment displacement of the abutment top 12; the pressure sensor 3 is used to detect the force applied to the abutment top 12; the control device is electrically connected to the displacement sensor 2, the pressure sensor 3, and the driving part 11. The shell-closing process monitoring method includes: acquiring the displacement and pressure values ​​detected by displacement sensor 2 and pressure sensor 3 in real time during the top stroke of the top 12; generating an actual pressure-displacement curve based on the real-time acquired displacement and pressure values; and comparing the actual pressure-displacement curve with the theoretical pressure-displacement curve to determine whether the shell-closing state is abnormal.

[0056] In one embodiment, the fastening monitoring device 100 further includes an alarm device and a display device; wherein the alarm device and the display device are both electrically connected to the control device. The alarm device is used to issue an alarm when an abnormality is detected in the fastening shell, so as to promptly detect product quality problems. The display device is used to display the corresponding data of the fastening shell, so that the location of the abnormality can be known through the display device and handled in a timely manner.

[0057] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for monitoring the shell fitting process, applied to a snap-fit ​​monitoring device, characterized in that, The fastening monitoring device includes a drive unit, a pressure sensor, and a stop top connected sequentially from top to bottom. The drive unit drives the stop top downwards to press the fastening shell together. The fastening monitoring device also includes a control device and a displacement sensor. The displacement sensor detects the displacement of the stop top. The control device is electrically connected to the drive unit, the pressure sensor, and the displacement sensor respectively. The method for monitoring the shell closure process includes: During the top-reaching stroke, the displacement and pressure values ​​detected by the displacement and pressure sensors are acquired in real time. Based on the real-time displacement and pressure values, an actual pressure-displacement curve is generated; The actual pressure-displacement curve is compared with the theoretical pressure-displacement curve to determine whether the snap-fit ​​shell is in an abnormal state.

2. The shell closure process monitoring method as described in claim 1, characterized in that, The pressure-displacement curve has a curve endpoint corresponding to the end position of the top stroke; The step of comparing the actual pressure-displacement curve with the theoretical pressure-displacement curve to determine whether the engagement state of the locking shell is abnormal includes: Obtain the actual endpoint displacement value corresponding to the endpoint of the actual pressure-displacement curve; Calculate the displacement difference between the actual endpoint displacement value and the theoretical endpoint displacement value corresponding to the endpoint of the theoretical pressure-displacement curve; Based on the displacement difference, it is determined whether the snap-fit ​​shell is properly assembled.

3. The shell closure process monitoring method as described in claim 2, characterized in that, The step of determining whether the snap-fit ​​shell is properly assembled based on the displacement difference includes: The absolute value of the displacement difference is compared with a first set value; When the absolute value of the displacement difference is less than or equal to the first set value, it is determined that the snap-fit ​​shell is assembled in place; When the absolute value of the displacement difference is greater than the first set value, it is determined that the fastening shell is not properly assembled.

4. The shell closure process monitoring method as described in claim 1, characterized in that, The top-stopping stroke includes a locking stroke segment; The step of comparing the actual pressure-displacement curve with the theoretical pressure-displacement curve to determine whether the engagement state of the locking shell is abnormal includes: Obtain the actual pressure-displacement curve and the actual locking curve segment corresponding to the locking stroke segment, as well as the theoretical pressure-displacement curve and the theoretical locking curve segment corresponding to the locking stroke segment; The actual locking curve segment is graphically matched with the theoretical locking curve segment to determine the buckle deformation recovery of the snap-fit ​​shell.

5. The shell closure process monitoring method as described in claim 1, characterized in that, The offset travel includes the engagement travel segment; The step of comparing the actual pressure-displacement curve with the theoretical pressure-displacement curve to determine whether the engagement state of the locking shell is abnormal includes: Obtain the actual engagement curve segment corresponding to the actual pressure-displacement curve and the engagement stroke segment, and the theoretical engagement curve segment corresponding to the theoretical pressure-displacement curve and the engagement stroke segment; The actual engagement curve segment is compared with the theoretical engagement curve segment, and the quality of the engagement structure of the engagement shell is determined based on the comparison result.

6. The shell closure process monitoring method as described in claim 5, characterized in that, The step of comparing the actual engagement curve segment with the theoretical engagement curve segment and determining the quality of the engagement structure of the fastening shell based on the comparison result includes: Obtain the actual maximum pressure value F1 corresponding to the end point of the actual engagement curve segment, and the theoretical maximum pressure value F2 corresponding to the end point of the theoretical engagement curve segment; Calculate the difference between F1 and F2; When the difference between F1 and F2 is less than the second set value, it is determined that the buckle of the fastening shell is broken or too small. When the difference between F1 and F2 is greater than the third set value, it is determined that the fastening shell has burrs, dimensional interference, or is designed to be too tight.

7. The shell closure process monitoring method as described in claim 5, characterized in that, The step of comparing the actual engagement curve segment with the theoretical engagement curve segment and determining the quality of the engagement structure of the fastening shell based on the comparison result includes: Obtain the actual slope of the actual engagement curve segment and the theoretical slope of the theoretical engagement curve segment; Compare the actual slope with the theoretical slope; Based on the comparison results, the quality status of the snap-fit ​​shell is determined.

8. The shell closure process monitoring method as described in claim 7, characterized in that, The engagement stroke segment has a first stroke segment and a second stroke segment arranged sequentially along the top stroke; the actual slope includes: a first actual slope corresponding to the first stroke segment and a second actual slope corresponding to the second stroke segment; the theoretical slope includes: a first theoretical slope corresponding to the first stroke segment and a second theoretical slope corresponding to the second stroke segment; The step of determining the quality status of the fastening shell based on the comparison results includes: When either of the following conditions is met: the absolute value of the difference between the first actual slope and the first theoretical slope is greater than a fourth set value, or the absolute value of the difference between the second actual slope and the second theoretical slope is greater than a fifth set value, the fastening shell guide structure is determined to be abnormal or the placement is abnormal.

9. A fastening monitoring device, characterized in that, include: The fastening and abutting device has a driving part and an abutting part, wherein the driving part drives the abutting part to move, so that the abutting part has an abutting stroke for abutting against the fastening shell; A displacement sensor is used to detect the displacement of the abutment top. A pressure sensor is used to detect the force applied to the abutment. The control device is electrically connected to the displacement sensor, the pressure sensor, and the drive unit; as well as, The control program for the engagement monitoring device is stored on the control device and can be run on the control device, the engagement monitoring device control program being configured to implement the steps of the engagement process monitoring method as described in any one of claims 1 to 8.

10. The fastening monitoring device as described in claim 9, characterized in that, The fastening monitoring device also includes: An alarm device is used to issue an alarm when an abnormality is detected in the locking housing. A display device is used to display the data corresponding to the fastening shell; The alarm device and the display device are both electrically connected to the control device.

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