A double material detection device and method for a punch press production line

Abstract

The application relates to the technical field of double-material detection and discloses a double-material detection device for a stamping production line, which comprises a control end and at least one double-material detection assembly; the double-material detection assembly comprises a distance adjusting device and at least two double-material detection ends installed on the distance adjusting device; the multiple double-material detection ends can realize multi-point and multiple repeated double-material detection, compensate for the missed detection defects of a single fixed detection point of an existing double-material detection device, reduce the missed detection rate, reasonably arrange the positions of multiple detection points, effectively avoid the missed detection caused by mispositioning and overlapping, the distance adjusting device can adjust the distance in three-dimensional directions, especially breaks through the inertia thinking of fixed detection of a detection sensor of an existing double-material detection device, creatively changes the use mode of two sensing pieces of the double-material detection end, adapts to single-board material detection of different sizes and multi-board material detection of different detection scenes, so that the detection of various stamping production lines can be met, the adjustment is convenient, and the application range is wide.

Description

Technical Field

[0001] This invention relates to the field of dual-material inspection technology, specifically to a dual-material inspection device and method for a stamping production line. Background Technology

[0002] Double-sheet inspection, also known as double-sheet detection, simply means checking the stacking of sheet metal on an automated stamping production line to ensure that the line only feeds single sheets. Feeding double or multiple layers of sheet metal into the press not only produces defective products but can also damage equipment or molds, leading to high repair costs and production delays. To ensure product, equipment, and mold quality and safety, and to guarantee continuous production, a double-sheet inspection system must be installed on the stamping production line. This system should issue alarm signals or pause the machine as needed to automatically or manually remove double sheets. Double-sheet inspection during automated sheet metal feeding has now become a standard production practice.

[0003] Currently, in the automotive parts stamping industry, automatic destacking and feeding technology is used to complete the feeding of sheet metal. Existing double-material detection devices are mostly installed at a fixed position on the production line. The sensors on the device perform a double-material detection on the sheet metal passing through the fixed position. In actual use, the following problems exist: double materials are still not detected, resulting in the press die pressing double or triple parts, causing the die to burst or break. The direct economic loss for a single incident exceeds 10,000 yuan, and sometimes even reaches more than 100,000 yuan. According to statistics, each machine basically experiences 6-10 double-material pressing incidents per year. For some users with smaller production scale, the occasional missed double material detection leads to die damage, resulting in serious direct economic losses, difficult repairs, and affecting product delivery.

[0004] To address the aforementioned issues, conventional optimization methods aim to improve the detection accuracy of dual-material detection devices. For example, this can be achieved by using sensors with higher detection accuracy or by reducing interference in the detection environment to provide a stable detection environment, thereby indirectly improving detection accuracy. However, these solutions still cannot completely eliminate the possibility of missed detections. Summary of the Invention

[0005] The present invention aims to provide a dual-material detection device for stamping production lines to solve the technical problem of low adaptability of detection points in existing dual-material detection devices.

[0006] The basic solution provided by this invention is: a dual-material detection device for a stamping production line, mounted on a base, including a control terminal and at least one dual-material detection component; the dual-material detection component is electrically connected to the control terminal; the dual-material detection component includes an adjustment device and at least two dual-material detection terminals mounted on the adjustment device;

[0007] The dual-material detection end includes two sensors, which are arranged opposite each other in a direction perpendicular to the movement of the sheet material. The two sensors are controlled by the control end to detect the sheet material parameters and feed the detection results back to the control end.

[0008] The control terminal is used to set detection parameters and control and adjust the operation of the dual-material detection terminal and the movement of the sheet metal according to the set detection parameters.

[0009] The distance adjustment device is used to adjust the distance between the two sensors at the dual-material detection end, the distance between the two dual-material detection ends, the distance between the dual-material detection assembly and the base, or the distance between the two dual-material detection assemblies. It can be used to adjust the distance in three dimensions to adapt to the detection of single-plate materials of different sizes and the detection of multiple-plate materials in different detection scenarios.

[0010] The working principle and advantages of this invention are as follows: This device is installed on the material rack between the material pick-up point and the material unloading point of the stamping production line. During the unpacking and loading process, double material detection is performed by this device and the corresponding detection method.

[0011] Compared with existing technologies, this solution changes the single, fixed detection point of existing dual-material inspection production lines. In actual production use, the inventors discovered that there are two reasons for missed detections. One is the commonly accepted reason of low precision in the inspection device. However, another situation exists: when the material handling device has low sensitivity, if the board material being inspected has two or more layers, there may be misalignment and overlap. In this case, even with high precision, single-point inspection alone will still result in false detections and missed detections. Therefore, based on the above, the inventors moved beyond the conventional thinking of improving the precision of the inspection components and instead focused on improving the device itself. The device is equipped with multiple dual-material inspection ends, enabling multi-point, repeated dual-material inspection. It only moves to the next inspection point after the previous one has passed inspection, overcoming the shortcomings of existing dual-material inspection systems with single, fixed inspection positions. Multi-point inspection ensures a lower false negative rate, and the rational layout of the multiple inspection points effectively avoids misalignment and overlap. Furthermore, the dual-material inspection ends are mounted on a specially designed adjustable device, allowing for three-dimensional adjustment to adapt to the inspection of single-sheet materials of different sizes and multi-sheet material inspection scenarios. This makes the device highly flexible and adaptable to various stamping production line inspection needs, offering convenient adjustment and a wide range of applications.

[0012] It is particularly important to emphasize that this device breaks away from the conventional thinking of fixed detection sensors in existing dual-material inspection devices. It creatively changes the way the two sensors at the dual-material inspection end are used, changing them from fixed to finely adjustable. Testing has shown that this method improves detection accuracy when inspecting sheets of different sizes, further enhancing both the versatility and accuracy of the device. Specifically, in existing technologies, to ensure detection accuracy, each model of dual-material inspection device has a limited range of sheet sizes that can be detected. That is, the distance between the two inspection ends and the sheet size must be kept within a certain range, and this range is usually small. It is generally believed that when the distance difference is small, because the inspection end components are highly accurate and have strong sensing force, the improvement in detection accuracy relies on the accuracy of the inspection end components, and is independent of the distance between the inspection ends. As long as the sheet material passes smoothly between the two inspection ends, accurate detection can be performed. Therefore, in normal use, it is not necessary to change the distance between the two inspection ends. However, the inventors of this solution found through testing that when detecting sheet metal of different sizes, by finely adjusting the distance between the two sensors to adapt to different sheet metal sizes, the detection accuracy can be improved compared with the method of keeping the distance constant. Therefore, the structure of this device and its special usage method were designed, which is especially suitable for users with small production scale to carry out economical transformation.

[0013] Furthermore, the distance adjustment device includes a first distance adjustment mechanism, a second distance adjustment mechanism, and at least two third distance adjustment mechanisms; one of the dual-material detection ends is correspondingly installed on one of the third distance adjustment mechanisms; at least two of the third distance adjustment mechanisms are installed on the second distance adjustment mechanism; the second distance adjustment mechanism is installed on the first distance adjustment mechanism.

[0014] Furthermore, the third distance adjustment mechanism includes a strip bracket with two first holes and two L-shaped brackets, wherein the two L-shaped brackets are respectively installed on the strip bracket through the two first holes, the L-shaped brackets are used to install the sensing element, and the strip bracket is connected to the second distance adjustment mechanism.

[0015] Furthermore, the second adjustment mechanism includes a strip back plate, wherein a second hole is formed along the length direction of the strip back plate, the length direction of the strip back plate is in the same direction as the sheet material movement direction, and at least two third adjustment mechanisms are respectively installed on the strip back plate through the second hole.

[0016] Furthermore, the first adjusting mechanism includes a guide rail, a lead screw handle, a lead screw mounting support, a lead screw, a guide rail slider, and a connecting plate for connecting the lead screw and the guide rail slider, wherein the second adjusting mechanism is connected to the connecting plate.

[0017] This invention is based on a dual-material detection device for a stamping production line, and also provides a dual-material detection method for a stamping production line, to solve the technical problem of low adaptability of detection points in existing dual-material detection devices.

[0018] The method includes the following steps:

[0019] S1: Determine the testing mode, sheet type, and sheet size;

[0020] S2: Determine the number and arrangement of dual-material detection components based on the detection mode and sheet material type;

[0021] S3: Based on the number, arrangement and size of the dual-material detection components, install the dual-material detection components into the preset mounting positions on the base, and adjust the distance of the dual-material detection components in three dimensions.

[0022] S4: The sheet metal is moved for testing and stops at the first double-sheet detection end under preset conditions. The detection parameters of the control terminal are adjusted to meet the single sheet metal detection requirements, and the position where the sheet metal stops is determined as the first detection point. The sheet metal is moved under preset conditions and stops at the next double-sheet detection end in sequence. When the control terminal displays that the detection is qualified, the position where the sheet metal stops is determined as the detection point represented by that double-sheet detection end, and the detection point and the corresponding position information are sent to the control terminal for storage.

[0023] S5: According to the preset working conditions and detection methods, the sheet metal moves and performs double material detection at the detection points in sequence, and feeds the detection results back to the control terminal. The control terminal judges whether to issue an early warning and stop the machine or move to the next detection point based on the detection results.

[0024] Furthermore, in S1, the detection modes include single-board material detection and multi-board material detection, and the board material types include large-size board material and small-size board material. In combination with the board material type, single-board material detection includes large-size single-board material detection and small-size single-board material detection, and multi-board material detection includes in-situ double-board material detection and misaligned double-board material detection.

[0025] Furthermore, in S2, based on the detection mode and board type, the number and arrangement of the dual-board detection components are determined as follows: for large-size single-board detection and same-position dual-board detection, two dual-board detection components are installed in an aligned manner; for small-size single-board detection, one dual-board detection component is installed at a fixed point; for misaligned dual-board detection, two dual-board detection components are installed in a misaligned manner.

[0026] Furthermore, in S4, the detection parameters include detection methods; the detection methods include fixed-point detection methods and moving detection methods.

[0027] Furthermore, the fixed-point detection method involves stopping the sheet material at a preset initial speed after it reaches a detection point, and then proceeding to double material detection. Based on the detection results, the material is either given a warning or moved to the next detection point. The moving detection method involves setting a deceleration point at a first distance before each detection point. When the sheet material reaches the deceleration point, it decelerates and moves at a constant speed through the detection point for double material detection. Based on the detection results, the material is either given a warning or moved to the next detection point. Attached Figure Description

[0028] Figure 1 This is a schematic diagram illustrating the installation and use of a dual-material detection device for a stamping production line, provided in an embodiment of the present invention.

[0029] Figure 2 This is a schematic diagram of the structure of the dual-material detection component provided in an embodiment of the present invention;

[0030] Figure 3 This is a right view of the dual-material detection component provided in an embodiment of the present invention;

[0031] Figure 4 This is a front view of the dual-material detection component provided in an embodiment of the present invention;

[0032] Figure 5 This is a top view of the dual-material detection component provided in an embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the destacking and loading (single material sheet) process provided in an embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the destacking and loading process (co-position double-sheet material) provided in an embodiment of the present invention;

[0035] Figure 8 This is a schematic diagram of the destacking and loading process (misaligned double-sheet material) provided in an embodiment of the present invention;

[0036] Figure 9 This is a schematic diagram of the motion control program for two-factor detection provided in an embodiment of the present invention. Detailed Implementation

[0037] The following detailed explanation illustrates the specific implementation methods:

[0038] The markings in the accompanying drawings include: material rack 1, plate 2, material picking position 3, material placing position 4, double material detection assembly 5, double material detection end 51, sensor 511, first adjustment mechanism 52, guide rail 521, lead screw handle 522, lead screw mounting support 523, lead screw 524, guide rail slider 525, connecting plate 526, second adjustment mechanism 53, strip back plate 531, second strip hole 5311, third adjustment mechanism 54, strip bracket 541, first strip hole 5411, L-shaped bracket 542, and base 6.

[0039] The basic implementation examples are as follows: Figure 1 , Figure 2 and Figure 3 As shown, a dual-material inspection device for a stamping production line is used to perform dual-material inspection on sheet metal 2. In this embodiment, sheet metal 2 is a metal sheet with a conventional thickness ranging from 0.5 to 4.5 mm, a length ranging from 200 to 1200 mm, and a width ranging from 100 to 800 mm, available in various sizes. Figure 4 The coordinate system is used to define the direction. The Y-axis is the direction of sheet material movement, the Y-axis defines the width direction of the sheet material, and the X-axis defines the length direction of the sheet material.

[0040] This dual-material detection device includes a control terminal and at least one dual-material detection component 5; the dual-material detection component 5 is electrically connected to the control terminal. It should be noted that in practical use, multiple dual-material detection components 5 can be used in combination. They are installed on the base 6 of the stamping production line's destacking and loading process in a certain manner according to the detection requirements. Specific combinations will be described later; firstly, the structure of a single dual-material detection component 5 will be explained.

[0041] like Figure 2 and Figure 3 As shown, the dual-material detection assembly 5 includes a spacing adjustment device and at least two dual-material detection ends 51 mounted on the spacing adjustment device; in this embodiment, two dual-material detection ends 51 are provided. Figure 3 (The part within the corresponding dashed box) In other embodiments, more double-material detection ends 51 can be set according to the size of the sheet 2 and the detection requirements. All methods with multiple double-material detection ends 51 are within the protection scope of this invention.

[0042] The dual-material detection end 51 includes two sensors 511. In this embodiment, the sensors 511 can be SP-NP2-TRJ 30*45 type sensors to achieve high-precision and accurate detection. The two sensors 511 are arranged opposite each other along a direction perpendicular to the movement of the sheet material 2, such as... Figure 4As shown, the two sensors 511 are aligned vertically along the Z-axis to ensure accurate detection when the sheet metal 2 passes between the two sensors 511. The two sensors 511 are controlled by the control terminal to detect the parameters of the sheet metal 2 and feed the detection results back to the control terminal. Generally, the parameters of the sheet metal 2 are the thickness of the sheet metal 2. The matching parameters of the sheet metal 2 can be reasonably selected according to the different sensors 511.

[0043] The distance adjustment device is used to adjust the distance between the two sensing elements 511 of the dual material detection end 51, and also to adjust the distance between the two dual material detection ends 51, as well as to adjust the distance between the dual material detection component 5 and the material rack 1 or the distance between adjacent dual material detection components 5. The distance adjustment is made in three dimensions to adapt to the detection of single-board materials 2 of different sizes and the detection of multi-board materials 2 in different detection scenarios.

[0044] Specifically, such as Figure 3 As shown, the distance adjustment device includes a first distance adjustment mechanism 52, a second distance adjustment mechanism 53, and at least two third distance adjustment mechanisms 54. Figure 3 (The corresponding dashed box portion); one of the dual material detection ends 51 is installed on a third distance adjustment mechanism; at least two of the third distance adjustment mechanisms are installed on the second distance adjustment mechanism 53; the second distance adjustment mechanism 53 is installed on the first distance adjustment mechanism 52.

[0045] like Figure 2 and Figure 3 As shown, the third adjustment mechanism 54 includes a strip bracket 541 with two first holes 5411 and two LL-type brackets 542. The two LL-type brackets 542 are respectively installed on the strip bracket 541 through the two first holes 5411. The sensing element 511 is installed on the LL-type bracket 542. The distance between the two sensing elements 511 of the dual material detection end 51 is adjusted by adjusting the position of at least one LL-type bracket 542 on the first hole 5411. In this embodiment, two M10 bolt holes are drilled in the center of the strip bracket 541 for installing the third adjustment mechanism 54 on the second adjustment mechanism 53. Two M6 strip holes (i.e., first holes 5411) are opened at the center of both ends. The minimum distance between the two first holes 5411 is controlled within the range of 90-95mm, and 94mm is specially selected to control the adjustment distance within a suitable range, while adapting to most conventional plate thicknesses and improving detection versatility.

[0046] The second adjusting mechanism 53 includes a strip-shaped back plate 531 with a second hole 5311 along its length. The length of the strip-shaped back plate 531 is in the same direction as the moving direction of the sheet 2. At least two third adjusting mechanisms 54 are installed on the strip-shaped back plate 531 through the second hole 5311. The distance between the two double-material detection ends 51 is adjusted by adjusting the position of at least one third adjusting mechanism 54 in the second hole 5311. In this embodiment, the strip-shaped back plate 531 is specifically 600mm long, with a 500mm long, M10 hole (i.e., the second hole 5311) in the center, which serves as a screw hole for fixing the strip-shaped bracket 541.

[0047] Among them, such as Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the first adjusting mechanism 52 includes a guide rail 521, a lead screw handle 522, a lead screw mounting support 523, a lead screw 524, a guide rail slider 525, and a connecting plate 526 for connecting the lead screw 524 and the guide rail slider 525. The guide rail 521 can be an HGR15 model product with a specially selected length of 800mm; the lead screw handle 522 can be a plum blossom handle, used to adjust the forward and backward movement of the lead screw 524; the lead screw mounting support 523 is used to fix the lead screw 524 and the guide rail 521; the lead screw 524 can be an M18 lead screw; the guide rail slider 525 can be an HGH15CA model product; the connecting plate 526 is used to connect the lead screw 524 and the guide rail slider 525. The above components can be installed using existing installation techniques, ultimately allowing the dual-material detection end 51 to slide on the guide rail 521 to adjust its forward and backward position, further adjusting the distance between the dual-material detection component 5 and the material rack 1, or the distance between the two dual-material detection components 5. The strip-shaped back plate 531 is mounted on the connecting plate 526 through the second hole 5311, allowing for position adjustment of the strip-shaped back plate 531 to create a misalignment. In other embodiments, a cylinder can also be used for adjustment.

[0048] This solution describes a dual-material detection device for a stamping production line, which, in practical use, is installed... Figure 1 The device is used on the base 6 shown. In order to clearly describe how to use this device, we will first describe the destacking and loading process in one application scenario. That is, several plates 2 are placed at the picking position. The control terminal controls the material rack 1 to pick up the plates 2 at the picking position and move the plates 2 along a preset path from the picking position to the double material detection device. After passing the double material detection device, the plates are moved to the unloading position to enter the next process.

[0049] During production, there are situations where single-set sheet metal 2 is produced and two-set sheet metal 2 are produced simultaneously. When two sets of sheet metal 2 are produced simultaneously, they are usually placed in a straight line, and the positions of the sensors on both sides are approximately the same during inspection. However, there are also some cases in reality where, due to the mold cavity design, the two sets of sheets move in a staggered manner. Therefore, based on the actual application scenario, this device provides a dual-sheet inspection method for stamping production lines as follows:

[0050] S1: Determine the detection mode, sheet material 2 type, and sheet material 2 size;

[0051] Specifically, the detection modes include single-board material 2 detection and multi-board material 2 detection. The types of board material 2 include large-size board material 2 and small-size board material 2. In combination with the types of board material 2, single-board material 2 detection includes large-size single-board material 2 detection and small-size single-board material 2 detection. Multi-board material 2 detection includes same-position double-board material 2 detection and misaligned double-board material 2 detection. Figure 1 The sheet material 2 shown can be considered as a large-size single sheet material 2, or the largest sheet material 2 that the feeding platform can feed can be considered as a large-size sheet material 2. Sheets 2 whose size is less than half that of the large-size sheet material 2 can be considered as small-size sheet materials 2. The specific distinction can be set according to the structure of the production line base 6. In this embodiment, the large size that matches the existing picking platform is 1000*600mm, and the small size is 300*150mm.

[0052] S2: Determine the quantity and arrangement of the dual-material detection components 5 based on the detection mode and the type of sheet material 2;

[0053] Specifically, for both the inspection of large-size single-layer veneer 2 and the inspection of co-located double-layer veneer 2, two double-layer inspection components 5 are installed in an aligned manner, such as... Figure 6 and Figure 7 As shown; when inspecting small-sized veneer material 2, a dual-material inspection component 5 is installed at a fixed point, that is, in Figure 6 and Figure 7 Based on this, only one double-material detection component 5 needs to be installed on the same side as the sheet material; when detecting misaligned double-plate materials 2, two double-material detection components 5 are installed in a misaligned manner, such as... Figure 8 As shown; it should be noted that, in Figure 6 and Figure 7 Based on this, the installation position of the first adjusting mechanism 52 can remain unchanged, and only the second adjusting mechanism 53 needs to be adjusted. Of course, the position of the third adjusting mechanism 54 on the second adjusting mechanism 53 can also be adjusted to form a misalignment.

[0054] S3: Based on the quantity, arrangement and size of the dual-material detection components 5 and the plate 2, install the dual-material detection components 5 into the preset installation position of the base 6, and adjust the distance of the dual-material detection components 5 in three dimensions.

[0055] Specifically, the base 6 has a preset installation position. When there is only one dual-material detection component 5, the first adjustment mechanism 52 is fixedly installed on the support frame of the base 6, located between the material picking position 3 and the material discharging position 4, 800mm-900mm away from the end of the material picking area, to ensure that the installation position does not interfere with the gripping of the widest material. When there are two dual-material detection components 5, the two first adjustment mechanisms 52 are installed facing each other, with a minimum distance of 180-210mm between them, so that the smallest material piece allowed by the equipment can be detected on both sides.

[0056] The three-dimensional distance adjustment is specifically achieved by using the third distance adjustment mechanism 54 to adjust the distance between the two sensing elements 511 of the double material detection end 51 according to the thickness of the sheet material 2. In this embodiment, the minimum distance between the upper and lower sensing elements 511 (i.e., sensors) is 20mm, and the maximum installation distance is 50mm. This range of settings has a wide range of adaptability. The distance between the two sensing elements 511 needs to be greater than the thickness of the double material. The difference is controlled within the effective range to ensure that the sheet material 2 passes smoothly between the two sensing elements 511. At the same time, matching different difference values ​​according to the thickness of the sheet material 2 can improve the detection accuracy.

[0057] To verify the above effects, the following four rounds of testing and analysis were conducted.

[0058] Table 1. Test data on the installation distance adjustment of the dual-material sensor.

[0059]

[0060] Table 2 Test data for adjusting the installation distance of the dual-material sensor

[0061]

[0062] Table 3 Test data for adjusting the installation distance of the dual-material sensor

[0063]

[0064] Table 4 Test data on the installation distance adjustment of the dual-material sensor

[0065]

[0066]

[0067] Based on Tables 1, 2, 3, and 4, the analysis shows that when the vertical installation distance of the sensor is 20-50mm, the best pass rate for detecting thicknesses within 1mm is achieved at an installation distance of 50mm; the best pass rate for detecting thicknesses within 2mm is achieved at an installation distance of 40mm; the best pass rate for detecting thicknesses within 3mm is achieved at an installation distance of 30mm; and the best pass rate for detecting thicknesses within 4.5mm is achieved at an installation distance of 20mm. The thicker the material, the smaller the sensor distance should be.

[0068] The distance between the two double-material detection ends 51 is adjusted by the second adjustment mechanism 53. The width of the sheet 2 is defined by the direction of the sheet 2 movement, i.e., the Y-axis. The distance between the two double-material detection ends 51 should be greater than the width of the sheet 2, and the difference should be controlled within the range of 10-50mm. This ensures that when the sheet 2 moves to the next detection point for detection, it completely leaves the previous detection point, avoids mutual interference of detection results, and improves the independence and accuracy of the detection results at each detection point.

[0069] When there is one dual-material detection component 5, the first adjusting mechanism 52 adjusts the distance between the dual-material detection component 5 and the material rack 1, so that the movement paths of the dual-material detection end 51 and the sheet 2 are matched; when there are two dual-material detection components 5, the first adjusting mechanism 52 also adjusts the distance between the two dual-material detection components 5, such as... Figure 6 As shown, during the inspection of large-size single sheet metal, the spacing between the two double-sheet inspection components 5 must ensure that the spacing between the double-sheet inspection ends 51 of the first inspection point at the top and bottom of the image is less than the length of the sheet metal 2. This difference ensures that a single top and bottom double-point inspection is performed on the large-size sheet metal 2. Figure 7 and Figure 8 As shown, during dual-piece detection, whether the pieces are in the same position or misaligned, the spacing between the dual-piece detection ends 51 needs to ensure that there is a suitable gap between the two pieces. This is to ensure that the two pieces can move smoothly during simultaneous effective detection, and at the same time, to ensure that the detection results of the two pieces are independent and that there is no overlapping part that interferes with the detection results.

[0070] S4: The sheet material 2 is moved for testing and stops at the first double-material detection end 51 under preset conditions. The detection parameters of the control end are adjusted to meet the detection of a single sheet material 2, and the position where the sheet material 2 stops is determined as the first detection point. The sheet material 2 moves and stops at the next double-material detection end 51 under preset conditions. When the control end displays that the detection is qualified, the position where the sheet material 2 stops is determined as the detection point represented by the double-material detection end 51, and the detection point and the corresponding position information are sent to the control end.

[0071] Specifically, in S4, after the entire testing device is installed, sheet material 2 is moved for testing. The material rack 1 is manually started, using it to pick up a set of sheets from the material pick-up position 3 and move them to the position detected by the first dual-material detection end 51. The screw handle 522 is rotated to move the dual-material detection end 51 towards sheet material 2. When the dimension between sheet material 2 and the sensing element 511 is greater than the dimension of the sensing element 511 itself, the detection range is valid, and the screw 524 is stopped. The control terminal detection parameters are then adjusted. First, the detection range is selected based on the thickness of sheet material 2, and then the control terminal detection sensitivity is adjusted to meet the single-sheet signal requirement, with 3-4 green indicator lights illuminating. The position where sheet material 2 stops is then saved as the #1 dual-material detection point. The material rack 1 is then manually moved to move sheet material 2 to the position detected by the second dual-material detection end 51. The control terminal display is observed to see if it shows a single-sheet signal. If so, the current position of sheet material 2 is saved as the #2 dual-material detection point. After setting, the material rack formula parameters are saved for future reference. Return material rack 1 to its original position to prepare to switch to automatic mode and start continuous production.

[0072] In S4, the detection parameters include the detection method; the detection method includes fixed-point detection method and moving detection method.

[0073] Specifically, this solution's multiple double-material detection device, during operation, ensures that the feeding speed matches the subsequent robotic arm's running speed when setting the two detection positions. That is, the use of two double-material detections during destacking and feeding should not cause subsequent workstations to be in a waiting state. The detection methods include fixed-point detection and moving detection. In the fixed-point detection method, when sheet material 2 moves to a detection point at a preset initial speed, it stops moving and waits for the double-material detection. Based on the detection result, it is either given a warning or moved to the next detection point. In the moving detection method, a deceleration point is set at a first distance before each detection point. When sheet material 2 reaches the deceleration point, it decelerates and moves at a constant speed through the detection point for double-material detection. Based on the detection result, it is either given a warning or moved to the next detection point.

[0074] S6: According to the preset working conditions and detection parameters, the sheet 2 moves and performs double material detection at the detection points in sequence, and feeds the detection results back to the control terminal. The control terminal judges whether to stop the machine or move to the next detection point based on the detection results.

[0075] When the material sheet passes a double-material detection point, the control terminal sends a single-material feedback before moving to the next double-material detection point. After receiving a single-material feedback, it moves directly to the unloading position 4, unloads the material, and returns to the hopper to continue retrieving material. During production, if any double-material detection position sends a double-material signal, the motion control program is immediately interrupted, an alarm is triggered, and the machine stops. An audible and visual alarm alerts the operator to confirm and handle the issue before production can resume. Figure 9The motion control program for the two dual-material detections is shown.

[0076] This embodiment provides a dual-material inspection device and method for a stamping production line, which can realize multi-point, repeated dual-material inspection. Small-sized single-material sheets are inspected at least 2 inspection points, and large-sized single-material sheets are inspected at least 4 inspection points. For identical and misaligned dual-material sheets, the inspection environment can be quickly set up by adding dual-material inspection components and reasonable layout, which can easily complete the device's adaptability to the inspection scenario. It makes up for the omission defect of the single fixed inspection position in the existing dual-material inspection. Multi-point inspection ensures a lower omission rate. At the same time, the reasonable layout of multiple inspection points can effectively avoid misalignment and overlapping omissions. In addition, the dual-material inspection end is installed on a specially designed adjustment device, which can be adapted to the inspection of single-sheet materials of different sizes and the inspection of multiple sheets of materials in different inspection scenarios through three-dimensional adjustment. This makes the device flexible and versatile enough to meet the inspection scenarios of various stamping production lines. It is easy to adjust and has a wide range of applications.

[0077] The above descriptions are merely embodiments of the present invention. Commonly known structures and characteristics of the solutions are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A dual-material detection device for a stamping production line, mounted on a base, characterized in that, It includes a control terminal and at least one dual-material detection component; the dual-material detection component is electrically connected to the control terminal; the dual-material detection component includes a distance adjustment device and at least two dual-material detection terminals installed on the distance adjustment device; The dual-material detection end includes two sensors, which are arranged opposite each other in a direction perpendicular to the movement of the sheet material. The two sensors are controlled by the control end to detect the sheet material parameters and feed the detection results back to the control end. The control terminal is used to set detection parameters and control and adjust the operation of the dual-material detection terminal and the movement of the sheet metal according to the set detection parameters. The distance adjustment device is used to adjust the distance between the two sensors at the dual material detection end, and also to adjust the distance between the two dual material detection ends, as well as the distance between the dual material detection assembly and the base or the distance between the two dual material detection assemblies. It can be used to adjust the distance in three dimensions to adapt to the detection of single-plate materials of different sizes and the detection of multiple-plate materials in different detection scenarios. The distance adjustment device includes a first distance adjustment mechanism, a second distance adjustment mechanism, and at least two third distance adjustment mechanisms; one of the dual-material detection ends is correspondingly installed on one of the third distance adjustment mechanisms; all the third distance adjustment mechanisms are installed on the second distance adjustment mechanism; the second distance adjustment mechanism is installed on the first distance adjustment mechanism; The third distance adjustment mechanism includes a strip bracket with two first holes and two L-shaped brackets. The two L-shaped brackets are respectively installed on the strip bracket through the two first holes. The L-shaped brackets are used to install the sensing element. The strip bracket is connected to the second distance adjustment mechanism.

2. The dual-material detection device for a stamping production line according to claim 1, characterized in that, The second adjustment mechanism includes a strip back plate, wherein a second hole is opened along the length direction of the strip back plate, and the length direction of the strip back plate is in the same direction as the moving direction of the sheet metal, wherein the third adjustment mechanism is installed on the strip back plate through the second hole.

3. The dual-material detection device for a stamping production line according to claim 1, characterized in that, The first adjustment mechanism includes a guide rail, a lead screw handle, a lead screw mounting support, a lead screw, a guide rail slider, and a connecting plate for connecting the lead screw and the guide rail slider, wherein the second adjustment mechanism is connected to the connecting plate.

4. A dual-material inspection method for a stamping production line, characterized in that, The method of using a dual-material detection device for a stamping production line according to any one of claims 1-3 to perform multi-point dual-material detection includes the following steps: S1: Determine the testing mode, sheet type, and sheet size; S2: Determine the number and arrangement of dual-material detection components based on the detection mode and sheet material type; S3: Based on the number, arrangement and size of the dual-material detection components, install the dual-material detection components into the preset mounting positions on the base, and adjust the distance of the dual-material detection components in three dimensions. S4: The sheet metal is moved for testing and stops at the first double-sheet detection end under preset conditions. The detection parameters of the control terminal are adjusted to meet the single sheet metal detection requirements, and the position where the sheet metal stops is determined as the first detection point. The sheet metal is moved under preset conditions and stops at the next double-sheet detection end in sequence. When the control terminal displays that the detection is qualified, the position where the sheet metal stops is determined as the detection point represented by that double-sheet detection end, and the detection point and the corresponding position information are sent to the control terminal for storage. S5: Based on the preset working conditions and detection parameters, the sheet metal moves and performs double material detection at each detection point in sequence, and feeds the detection results back to the control terminal. The control terminal determines whether to issue an early warning and stop the machine or move to the next detection point based on the detection results.

5. The dual-material inspection method for a stamping production line according to claim 4, characterized in that, In S1, the detection modes include single-board material detection and multi-board material detection. The board material types include large-size board material and small-size board material. In combination with the board material type, single-board material detection includes large-size single-board material detection and small-size single-board material detection. Multi-board material detection includes in-situ double-board material detection and misaligned double-board material detection.

6. The dual-material inspection method for a stamping production line according to claim 5, characterized in that, In S2, based on the detection mode and board type, the number and arrangement of the dual-board detection components are determined as follows: for large-size single board detection and same-position dual board detection, two dual-board detection components are installed in an aligned manner; for small-size single board detection, one dual-board detection component is installed at a fixed point; for misaligned dual board detection, two dual-board detection components are installed in a misaligned manner.

7. The dual-material inspection method for a stamping production line according to claim 4, characterized in that, In S4, the detection parameters include the detection method; the detection method includes fixed-point detection method and moving detection method.

8. The dual-material inspection method for a stamping production line according to claim 7, characterized in that, The fixed-point detection method involves stopping the sheet material at a preset initial speed after it reaches a detection point, and then proceeding to double material detection. Based on the detection results, the material is either given a warning or moved to the next detection point. The moving detection method involves setting a deceleration point a first distance before each detection point. When the sheet material reaches the deceleration point, it decelerates and moves at a constant speed through the detection point for double material detection. Based on the detection results, the material is either given a warning or moved to the next detection point.

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