A plastic grid forming post-detection device and detection method

Abstract

The application relates to the technical field of plastic grid detection, and discloses a plastic grid post-forming detection device and method, which comprises a basic function test module, a vehicle frame, a four-corner flatness test module, a joint flatness test module and a condition test module. The basic function test module is used for testing the connection matching and firmness of the plastic grid. The four-corner flatness test module is used for testing the four-corner flatness of the spliced plastic grid. The joint flatness test module is used for testing the joint flatness of the spliced plastic grid. The condition test module is used for performing additional condition tests on the spliced plastic grid. Through cooperation of the multiple modules, the problem that the four-corner data collected by the laser displacement sensor needs to be screened to confirm whether the four corners are aligned is solved. Through the load and turning simulation functions of the condition test module, the real restoration of the overall stress distribution of the spliced grid is realized, and the defect that the traditional detection method cannot reflect the deformation in the actual use scene is effectively overcome.

Description

Technical Field

[0001] This invention relates to the field of plastic grating testing technology, specifically to a testing device and method for plastic grating after molding. Background Technology

[0002] There are many types of plastic gratings, including anti-slip interlocking gratings used in car washes. These gratings undergo a series of tests after molding and before leaving the factory, including appearance quality inspection, dimensional accuracy inspection, load-bearing capacity inspection, anti-slip performance inspection, and flatness inspection after splicing.

[0003] Currently, the traditional method of flatness inspection is to use manual visual inspection in conjunction with a ruler or feeler gauge. After the inspector lays the grid flat on the inspection platform, he moves the ruler along the grid surface to observe the gaps, or uses a feeler gauge to insert into the gap between the grid and the platform to measure the height difference.

[0004] This inspection method involves inspecting the bottom of the grille. In addition, the joints of the grille also need to be inspected. The existing inspection method relies on laser displacement sensors to inspect the four corners. However, the surface of the grille has not only anti-slip grooves but also anti-slip protrusions. The collected data from the four corners needs to be screened to confirm whether the four corners are aligned, resulting in low inspection efficiency and a high risk of misjudgment. Furthermore, the existing equipment lacks simulation of the overall stress distribution after the grille is spliced ​​during the inspection process, and cannot truly reflect the deformation under actual use scenarios, resulting in some products with potential structural defects entering the market. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a testing device and method for plastic grating after molding. The main purpose is to solve the problems that the four corner data collected by the laser displacement sensor needs to be filtered to confirm whether the four corners are aligned, resulting in low testing efficiency and easy misjudgment, as well as the lack of simulation of the overall stress distribution after grating splicing, which cannot truly reflect the deformation situation in actual use scenarios.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A testing device for plastic grating after molding includes a basic function testing module for testing the matching and firmness of the connectors of the plastic grating; a frame, positioned above the basic function testing module; a four-corner flatness testing module, positioned on the front side of the frame, for testing the flatness of the four corners of the assembled plastic grating; a seam flatness testing module, positioned on the rear side of the frame, with the distance between it and the four-corner flatness testing module being the same as the length of the plastic grating, for testing the seam flatness of the assembled plastic grating; and a conditional testing module, positioned above the frame, for performing additional conditional tests on the assembled plastic grating.

[0007] Furthermore, the four-corner flatness testing module includes: a dual-axis linear module, fixed to the front side of the vehicle frame, with a mounting bracket fixedly installed at the movable end of the dual-axis linear module; a fixed cylinder, fixedly installed at the four corners of the bottom of the mounting bracket, with a detection rod movably installed inside the fixed cylinder; a displacement sensor, fixedly installed at the upper end of the mounting bracket and located above the fixed cylinder, with the detection rod extending into the displacement sensor; and a circular plate, fixedly installed below the detection rod for contacting the plastic grille.

[0008] Based on the aforementioned scheme, the four-corner flatness test module further includes: a rubber ring, which is fixedly installed on the outer circumference of the test rod and located inside the fixed cylinder; an air pipe connector, which is fixedly installed on one side of the mounting frame and connected to an external air pump; and an air distribution pipe, which is fixed at both ends to the air pipe connector and the fixed cylinder respectively, for discharging gas into the gap between the rubber ring and the top of the fixed cylinder.

[0009] As a further embodiment of the present invention, the condition testing module includes: a slide block, slidably mounted on the top of the frame and driven by a linear motor; a hydraulic cylinder, fixedly mounted on the top of the slide block, with a connecting plate rotatably mounted on the bottom of the hydraulic cylinder; a turntable, rotatably mounted in the middle of the slide block, with a spline hole coaxially formed on the turntable, and a spline shaft slidably mounted in the spline hole; a wheel frame, fixedly mounted on the bottom end of the spline shaft, with a wheel rotatably mounted in the wheel frame; and a stop frame, located on both sides of the basic function testing module, used to prevent the frame from derailing from the ground rail.

[0010] Furthermore, the condition test module also includes: a second servo motor, fixedly mounted on one side of the slide, with a worm gear fixedly mounted on the output shaft of the second servo motor; and a worm wheel, fixedly mounted on the turntable, coaxial with the turntable, and used in conjunction with the worm gear.

[0011] Based on the aforementioned scheme, the basic function test module includes: a base, with a cover fixedly installed on the top of the base, and a placement opening through the top of the cover; a mounting rod, slidably installed on the base and located around the placement opening, used in conjunction with the connector of the plastic grid; a limiting bracket, fixed to the side of the mounting rod away from the plastic partition, with a slot at one end of the limiting bracket; a second electric push rod, fixedly installed on the top of the base, with a bracket fixedly installed at the movable end of the second electric push rod, the bracket being able to be inserted into the slot; and an L-shaped rod, fixedly installed on the top of the base, with a retaining groove on the side near the bracket.

[0012] Based on the aforementioned scheme, the basic function test module further includes: a first electric push rod, which is fixedly installed above the base, and a connecting frame is fixedly installed at the movable end of the first electric push rod, with the connecting frame slidably connected to the base; and a tension sensor, with both ends fixed to the connecting frame and the mounting rod, respectively.

[0013] Furthermore, the seam flatness testing module includes: a movable frame, slidably mounted on the rear side of the vehicle frame and driven by a ball screw module, with a first servo motor fixedly mounted at the bottom of the movable frame; a connecting plate, rotatably mounted below the movable frame and fixed to the output shaft of the first servo motor; a lifting frame, slidably mounted on the bottom of the connecting plate and driven by a third electric push rod; a rotating plate, rotatably mounted on one inner wall of the lifting frame, with a connecting shaft fixedly mounted on one side; an angle sensor, fixedly mounted on both sides of one end of the lifting frame and used in conjunction with the connecting shaft; a flexible strip, with both ends fixed to the rotating plate and the lifting frame respectively; and an arc-shaped elastic plate, with both ends fixed to the rotating plate and the lifting frame respectively.

[0014] Based on the aforementioned scheme, an electromagnetic lock is fixedly installed on one side of both the vehicle frame and the movable frame; an L-shaped plate is fixedly installed on the top of the cover, and a first notch is opened on the top of the L-shaped plate, which is used in conjunction with the electromagnetic lock; a limit block is fixedly installed on the top of the connecting plate, which is used in conjunction with the electromagnetic lock; and a vision sensor is fixedly installed on both ends of the connecting plate.

[0015] A method for inspecting plastic grating after molding, comprising the following steps: Step 1: First, place the plastic grille to be tested on the basic function test module and complete the assembly of the plastic grille. The basic function test module first conducts a basic screening of the matching degree of each connector of the grille and the firmness of the locking buckle. Only after ensuring that the connectors are not loose or misaligned can the subsequent testing steps be carried out. Step 2: The chassis then moves the four-corner flatness test module to the four corners of the grille. The four-corner flatness test module uses a contact measuring head to scan the four corners of the grille. The measuring head directly contacts the grille surface to obtain height data, effectively avoiding signal interference problems caused by surface reflection or small protrusions of the laser sensor. The measurement data is transmitted to the control system in real time for comparison and analysis. If the height difference of the four corners exceeds the preset threshold, the abnormal point is automatically marked and an alarm is triggered. Step 3: At the same time, the seam flatness test module moves synchronously to the grid seam position. Taking advantage of the equal spacing with the four corner flatness test modules, the flatness of the seam area can be evaluated when the four corners are tested. By collecting the height fluctuation data at the seam, it can be determined whether there is a warping defect in the seam. Step 4: After completing the static flatness test, the conditional test module starts the dynamic simulation test program. First, a vehicle simulated load test is conducted. The hydraulic loading device of the conditional test module applies vertical pressure to the grille surface according to the standard load distribution. The pressure value increases step by step and maintains a stable loading state. During this process, the four corner flatness test module and the joint flatness test module maintain real-time monitoring, record the deformation data of the grille under load, and analyze the displacement change trend of the connectors under pressure. Step 5: After the load test, the vehicle simulated turning test stage begins. The deflection mechanism of the condition test module applies horizontal shear force and torque to the grille to simulate the lateral stress generated when the vehicle turns. The frame adjusts the angle to restore the stress situation under different turning radii. During the test, stress response data of each connection node of the grille are continuously collected to generate a complete stress distribution cloud map. Step Six: After all the test items are completed, the control system integrates four types of data: basic function test, four corner flatness, joint flatness and condition test, to establish a comprehensive performance file for this batch of plastic gratings.

[0016] Compared with the prior art, the present invention provides a testing device and method for plastic grating after molding, which has the following beneficial effects: 1. This invention solves the problem that the four corner data collected by the laser displacement sensor needs to be filtered to confirm whether the four corners are aligned by using multiple modules in combination. At the same time, through the load and turning simulation function of the condition test module, the overall stress distribution after the grid is spliced ​​is realistically restored, which effectively overcomes the defect of traditional detection methods that cannot reflect the deformation under actual use scenarios.

[0017] 2. This invention complements the tensile test and the limit detection of the mounting rod, which can quickly screen obvious defects through visual observation and accurately evaluate the tensile performance of the connector through quantitative data, thus ensuring the comprehensiveness and reliability of the basic functional test.

[0018] 3. The present invention enables the retraction of the first electric push rod to achieve the reset operation of the installation rod, which facilitates the rapid clamping and inspection of the next batch of plastic grids and improves the continuous operation efficiency of the equipment.

[0019] 4. This invention can accurately calculate the relative height difference between the two sides of the seam by comparing the values ​​of two angle sensors. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram of a plastic grid molding post-forming inspection device proposed in this invention; Figure 2 This is an enlarged structural diagram of the basic functional testing module of a plastic grid molding post-forming testing equipment proposed in this invention; Figure 3 This is an enlarged structural diagram of the base of a plastic grid molding and testing device proposed in this invention; Figure 4 This invention proposes a testing device for plastic grating after molding. Figure 3 A partially enlarged structural diagram; Figure 5 This invention proposes a testing device for plastic grating after molding. Figure 1 A partially enlarged structural diagram; Figure 6 This is a schematic diagram of the front structure of the vehicle frame of a plastic grating molding and testing equipment proposed in this invention; Figure 7 This is a schematic diagram of the rear structure of the vehicle frame of a plastic grating molding and testing equipment proposed in this invention; Figure 8 This is an enlarged structural diagram of the four-corner flatness testing module of a plastic grid molding inspection device proposed in this invention; Figure 9 This invention proposes a testing device for plastic grating after molding. Figure 8 A partial sectional view of the structure; Figure 10 This is a schematic diagram of the joint flatness testing module structure of a plastic grid molding inspection device proposed in this invention. Figure 11 This invention proposes a testing device for plastic grating after molding. Figure 10 A partially enlarged structural diagram; Figure 12 This is an enlarged structural schematic diagram of the condition testing module of a plastic grid molding post-forming testing equipment proposed in this invention; Figure 13 This invention proposes a testing device for plastic grating after molding. Figure 12 A partially enlarged structural diagram; Figure 14 This invention proposes a testing device for plastic grating after molding. Figure 13 A schematic diagram of the overall exploded structure; Figure 15 This is a schematic diagram of a plastic grid structure.

[0021] In the diagram: 1. Basic function test module; 2. Bracket; 3. Chassis; 4. Four corner flatness test module; 5. Joint flatness test module; 6. Condition test module; 101. Base; 102. Cover; 103. Placement opening; 104. L-shaped plate; 105. First notch; 106. First electric push rod; 107. Connecting bracket; 108. Tension sensor; 109. Mounting rod; 110. Second electric push rod; 111. Insert bracket; 112. Limiting bracket; 113. L-shaped rod; 114. Slot; 115. Stop groove; 401. Dual-axis linear module; 402. Mounting bracket; 403. Displacement sensor; 404. Fixing cylinder; 405. Air pipe connector; 406. Detection rod; 407. Circular plate; 408. Rubber ring; 409. Air distribution pipe; 501. Movable frame; 502. Electromagnetic lock; 503. Limit block; 504. First servo motor; 505. Connecting plate; 506. Vision sensor; 507. Lifting frame; 508. Flexible strip; 509. Arc-shaped elastic plate; 510. Turning plate; 511. Connecting shaft; 512. Angle sensor; 513. Third electric push rod; 601. Slide; 602. Hydraulic cylinder; 603. Splined shaft; 604. Wheel frame; 605. Wheel; 606. Turntable; 607. Worm gear; 608. Worm; 609. Second servo motor; 610. Connecting plate; 611. Splined hole. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0023] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] Please see Figures 1-15This invention relates to a plastic grille molding inspection device. It addresses the problems of low inspection efficiency and susceptibility to misjudgments caused by the need to filter the corner data collected by laser displacement sensors to confirm corner alignment, and the lack of simulation of the overall stress distribution after grille splicing, which fails to accurately reflect deformation under actual usage scenarios. The device mainly consists of a basic function testing module 1, a corner flatness testing module 4, a seam flatness testing module 5, a condition testing module 6, and a vehicle frame 3, with the following specific relationships: Basic function test module 1, as the testing platform of this equipment, can test the matching and firmness between plastic grid connectors; The four-corner flatness test module 4 is set on the front side of the frame 3. It can test the flatness of the four corners after the plastic grille is spliced. Through contact detection, it can effectively avoid data interference caused by the protrusion of the four corners of the plastic grille. The seam flatness test module 5 is set on the rear side of the frame 3. It can test the flatness of the seam after the plastic grille is spliced. The distance between it and the four corner flatness test module 4 is the same as the length of the plastic grille, so that the flatness of the seam can be tested at the same time as the flatness of the four corners. The condition test module 6, located above the frame 3, can perform additional condition tests on the assembled plastic grille, such as vehicle simulated load test and vehicle simulated turning test.

[0026] The frame 3 is positioned above the basic function test module 1 and can move each module to ensure that each connection point can be tested. By using multiple modules in combination, the problem of needing to filter the four-corner data collected by the laser displacement sensor to confirm whether the four corners are aligned is solved. At the same time, through the load and turning simulation function of the condition test module 6, the overall stress distribution after the grid is spliced ​​is realistically restored, effectively overcoming the shortcomings of traditional detection methods that cannot reflect the deformation under actual use scenarios.

[0027] Based on the above, a method for detecting plastic grating is proposed, as follows: First, place the plastic grille to be tested on the basic function test module 1 and complete the assembly of the plastic grille. The basic function test module 1 first conducts a basic screening of the plug-in matching degree and locking firmness of each connector of the grille to ensure that the connectors are not loose or misaligned before proceeding to the subsequent testing stage. Subsequently, the frame 3 moves the four-corner flatness test module 4 to the four corners of the grille. The four-corner flatness test module 4 uses a contact measuring head to scan the four corners of the grille. The measuring head directly contacts the grille surface to obtain height data, effectively avoiding the signal interference problem caused by surface reflection or small protrusions of the laser sensor. The measurement data is transmitted to the control system in real time for comparison and analysis. If the height difference of the four corners exceeds the preset threshold, the abnormal point is automatically marked and an alarm is triggered. At the same time, the seam flatness test module 5 moves synchronously to the grid seam position. Taking advantage of the equal spacing with the four corner flatness test modules 4, the flatness of the seam area can be evaluated when the four corners are tested. By collecting the height fluctuation data at the seam, it can be determined whether there is a warping defect in the seam. After completing the static flatness test, the condition test module 6 starts the dynamic simulation test program. First, a vehicle simulated load test is conducted. The hydraulic loading device of the condition test module 6 applies vertical pressure to the grille surface according to the standard load distribution. The pressure value increases step by step and maintains a stable loading state. During this process, the four corner flatness test module 4 and the joint flatness test module 5 keep real-time monitoring, record the deformation data of the grille under load, and analyze the displacement change trend of the connectors under pressure. After the load test, the vehicle simulated turning test phase begins. The deflection mechanism of the condition test module 6 applies horizontal shear force and torque to the grille to simulate the lateral stress generated when the vehicle turns. The frame 3 adjusts its angle to restore the stress situation under different turning radii. During the test, stress response data of each connection node of the grille are continuously collected to generate a complete stress distribution cloud map.

[0028] After all testing items are completed, the control system integrates four types of data: basic function test, four-corner flatness, joint flatness, and condition test, to establish a comprehensive performance file for this batch of plastic gratings.

[0029] As a further embodiment of the present invention, refer to Figures 2-4 The basic function test module 1 includes the following components: The base 101 has a cover 102 fixedly installed on its top. The top of the cover 102 has a through opening 103, into which plastic grids can be placed. Multiple plastic grids can be assembled in the through opening 103. Slide the mounting rods 109 on the base 101 so that they are located around the placement opening 103 and are used in conjunction with the connectors of the plastic grille. When the plastic grille is spliced, the plastic grille is completely located within the placement space formed by the four mounting rods 109. If it cannot be completely installed, it indicates that there is a matching problem between the connectors. At this time, the limiting function of the mounting rods 109 can directly expose the size deviation of the grille frame or the processing error of the connectors. Meanwhile, a limiting bracket 112 is fixed on the side of the mounting rod 109 away from the plastic partition. One end of the limiting bracket 112 is provided with a slot 114, and a second electric push rod 110 is fixedly installed on the top of the base 101. A plug 111 is fixedly installed on the movable end of the second electric push rod 110. The extension of the second electric push rod 110 allows the plug 111 to be inserted into the slot 114, thereby restricting the movement of the mounting rod 109. To ensure the stability of the mounting rod 109, an L-shaped rod 113 is also fixedly installed on the top of the base 101. A retaining groove 115 is provided on the side of the L-shaped rod 113 near the insert 111. Similarly, the extension of the second electric push rod 110 allows the insert 111 to be inserted into the retaining groove 115, further restricting the displacement freedom of the mounting rod 109 and forming a double locking mechanism. After the plastic grid is assembled, the mounting rod 109 fits tightly against the grid frame. If the connector is loose or the latch is not fully engaged, the mounting rod 109 will have a gap displacement. Operators can quickly judge the connection firmness by observing the fit between the mounting rod 109 and the grid frame, and complete the initial screening without the need for complicated instruments. If there is a visible gap or wobbling between the mounting rod 109 and the grid frame, it indicates that there is a quality defect in the connection node, and it needs to be disassembled and reworked before proceeding to the next inspection stage.

[0030] In addition, during grille installation, the top is higher than the top of mounting rod 109.

[0031] Furthermore, the basic function test module 1 also includes the following components: A first electric push rod 106 is fixedly installed above the base 101. A connecting frame 107 is fixedly installed at the movable end of the first electric push rod 106. The connecting frame 107 is slidably connected to the base 101. At the same time, a tension sensor 108 (a type of mechanical sensor, model ZNLBS-VII) is fixedly installed between the connecting frame 107 and the mounting rod 109. The extension of the first electric push rod 106 can drive the installation rod 109 to move, thereby pulling the installation rod 109 and applying a quantitative tension to the connector of the plastic grid. The tension sensor 108 collects the tension value in real time and transmits it to the control system.

[0032] If the plastic grid connector does not detach or shift significantly when the tension reaches the preset threshold, the connection node is deemed to be of acceptable strength. If the connector becomes loose, disengaged, or the mounting rod 109 shifts abnormally under tension, the defect location is recorded.

[0033] This tensile test complements the limit detection of the mounting rod 109, allowing for quick screening of obvious defects through visual observation and precise evaluation of the tensile performance of the connector through quantitative data, ensuring the comprehensiveness and reliability of the basic functional tests.

[0034] It should be noted that the first electric actuator 106 is a high-thrust model, with a maximum output thrust of no less than 500 Newtons, such as the industrial-grade electric actuator XTL-500. This model has the characteristics of adjustable stroke and controllable speed, which can meet the tensile testing requirements of plastic grids of different specifications.

[0035] In addition, the retraction of the first electric push rod 106 enables the resetting operation of the mounting rod 109, facilitating the rapid clamping and inspection of the next batch of plastic grids and improving the continuous operation efficiency of the equipment.

[0036] At the same time, the retraction of the first electric push rod 106 enables the mounting rods 109 on both sides to perform a squeezing operation on the grid, simulating the lateral clamping force on the connector during the assembly process, and testing the structural stability and deformation resistance of the grid frame under pressure.

[0037] If the grid frame warps significantly or the connectors make abnormal noises when one of the mounting rods 109 moves inward, it indicates that the batch of products has insufficient material rigidity or structural design defects, and should be marked separately and the material re-inspection should be carried out.

[0038] As a further embodiment of the present invention, refer to Figure 5 , Figure 8 and Figure 9 The four-corner flatness test module 4 includes the following components: A dual-axis linear module 401 is fixedly installed on the front side of the frame 3. A mounting bracket 402 is fixedly installed on the movable end of the dual-axis linear module 401. A fixing cylinder 404 is fixedly installed at the four corners of the bottom of the mounting bracket 402. A detection rod 406 is movably installed inside the fixing cylinder 404. A circular plate 407 is fixedly installed below the detection rod 406. Meanwhile, a displacement sensor 403 (selectable model: XS-D series linear displacement sensor) is fixedly installed on the upper end of the mounting bracket 402. The displacement sensor 403 is located above the fixed cylinder 404, and the detection rod 406 is used in conjunction with the displacement sensor 403. When it is necessary to test the flatness of the four corners, the dual-axis linear module 401 drives the mounting bracket 402 to move above the four corners of the grille, the detection rod 406 falls, and the circular plate 407 contacts the grille surface, converting the height change of the grille surface into an electrical signal output. Because mechanical contact measurement is used, the contact area between the circular plate 407 and the grid surface is large, which can effectively average out local height fluctuations caused by small protrusions or depressions and avoid numerical jumps caused by single-point reflection of the laser sensor.

[0039] After all the data from the four detection points in the four corner areas have been collected, the diagonal height difference and the coplanarity of the four corners are calculated and judged. If the height deviation of the detection point exceeds 0.5 mm, the flatness of the corner is judged to be unqualified.

[0040] In addition, the four-corner flatness test module 4 also includes the following components: A rubber ring 408 is fixedly installed on the outer circumference of the detection rod 406. The rubber ring 408 is also located inside the fixed cylinder 404. At the same time, an air pipe connector 405 connected to an external air pump is fixedly installed on one side of the mounting bracket 402. The air pipe connector 405 and the fixed cylinder 404 are connected through a split air pipe 409. When the circular plate 407 comes into contact with the grid surface, the air pump injects compressed air into the fixed cylinder 404 through the air pipe joint 405. The rubber ring 408 moves downward under the action of air pressure, thereby pushing the circular plate 407 to the zero point. When the circular plate 407 is at zero, the air pump stops supplying air, and then the dual-axis linear module 401 can drive the mounting bracket 402 to perform detection. At this time, the circular plate 407 maintains stable contact with the grid surface under the action of the rubber ring 408, which not only ensures the accurate zeroing of the initial measurement position, but also avoids the zero-point drift problem caused by the detection rod 406 due to its own weight or mechanical clearance.

[0041] As a further embodiment of the present invention, refer to Figure 10 and Figure 11 The seam flatness test module 5 includes the following components: A movable frame 501 is slidably installed on the rear side of the frame 3 and can be driven by a ball screw module to change the position of the movable frame 501. A first servo motor 504 is fixedly installed at the bottom of the movable frame 501, and a connecting plate 505 that is rotatably installed with the movable frame 501 is fixedly installed on the output shaft of the first servo motor 504. Meanwhile, a lifting frame 507 is slidably installed at the bottom of the connecting plate 505, and the lifting frame 507 is driven to move up and down by the third electric push rod 513. A rotating plate 510 is rotatably installed on the inner wall of one side of the lifting frame 507. A connecting shaft 511 is fixedly installed on one side of the rotating plate 510, and angle sensors 512 (model MCU-103 can be selected) are fixedly installed on both sides of one end of the lifting frame 507. The angle sensors 512 work in conjunction with the connecting shaft 511 to identify the rotation angle of the rotating plate 510. Furthermore, a soft strip 508 is fixedly installed between the rotating plate 510 and the lifting frame 507. The soft strip 508 can be made of cloth, and its softness allows the rotating plate 510 to adapt to the undulations of the seam surface. Meanwhile, an arc-shaped elastic plate 509 is fixedly installed between the rotating plate 510 and the lifting frame 507. The arc-shaped elastic plate 509 will push the rotating plate 510 to move towards the lifting frame 507, thereby ensuring that the soft strip 508 is in a taut state.

[0042] When the seam flatness test module 5 moves to the test station, the third electric push rod 513 drives the lifting frame 507 to descend, and the soft strip 508 is located on both sides of the seam. Since the top of the grid exceeds the mounting rod 109, the soft strip 508 pulls the rotating plate 510 to rotate. By comparing the values ​​of the two angle sensors 512, the relative height difference between the two sides of the seam can be accurately calculated. If the angle difference between the two sides exceeds the allowable range, it indicates that there is a warping or misalignment defect at the joint. The flexible contact method of the soft strip 508 avoids the risk of scratching the grid surface by the rigid probe. At the same time, the pre-tightening force of the arc-shaped elastic plate 509 ensures that the soft strip 508 always fits the joint contour, improving the sensitivity and repeatability of the test.

[0043] The first servo motor 504 can drive the connecting plate 505 to rotate horizontally, and in conjunction with the ball screw module, adjust the position of the movable frame 501 so that the seam flatness test module 5 can adapt to seam layouts with different orientations, and can achieve full coverage detection for both horizontal and vertical seams.

[0044] Furthermore, in order to fix the frame 3 and the angle of rotation of the connecting plate 505, electromagnetic locks 502 are also fixedly installed on one side of both the frame 3 and the movable frame 501. Meanwhile, an L-shaped plate 104 is fixedly installed on the top of the cover 102. The top of the L-shaped plate 104 has a first notch 105, which is used in conjunction with the electromagnetic lock 502. A limiting block 503 is fixedly installed on the top of the connecting plate 505. The top of the limiting block 503 has a second notch. The limiting block 503 is used in conjunction with the electromagnetic lock 502. By extending the pin end of the electromagnetic lock 502, it is inserted into the first notch 105 or the second notch at the top of the limiting block 503, thereby completing the fixation of the frame 3 and the connecting plate 505.

[0045] When the electromagnetic lock 502 engages with the first notch 105, the frame 3 and the cover 102 form a rigid connection, ensuring that the four corner flatness test module 4 and the seam flatness test module 5 remain stable during the testing process, avoiding measurement errors caused by the displacement of the frame 3. When the electromagnetic lock 502 engages with the second notch at the top of the limit block 503, the rotation angle of the connecting plate 505 is locked, so that the soft strip 508 maintains a specific detection posture, which facilitates repeatable measurement of the seam.

[0046] In addition, visual sensors 506 (model MV-CA013-20GM) are fixedly installed at both ends of the connecting plate 505. The visual sensors 506 are used to collect gap image information of the splicing area in real time. This is existing technology, and the specific operating principle will not be described in detail here.

[0047] When the soft strip 508 detects a height abnormality, the vision sensor 506 moves to the current area and simultaneously magnifies the image of that area for manual verification by the operator, forming a dual verification mechanism of tactile measurement and visual detection.

[0048] As a further embodiment of the present invention, refer to Figure 12 and Figure 13 The condition test module 6 includes the following components: A slide block 601 is slidably mounted on the top of the frame 3, and the slide block 601 can be driven to move on the frame 3 by a linear motor. A hydraulic cylinder 602 is fixedly mounted on the top of the slide block 601. A connecting plate 610 is rotatably mounted on the bottom of the hydraulic cylinder 602. A spline shaft 603 is fixedly mounted on the bottom of the connecting plate 610. A wheel frame 604 is fixedly mounted on the bottom end of the spline shaft 603. A wheel 605 is rotatably mounted inside the wheel frame 604. A stop 2 is provided on both sides of the basic function test module 1 to prevent the frame 3 from leaving the ground rail on which the frame 3 travels. Pressure is applied to the spline shaft 603 by the hydraulic cylinder 602, thereby transmitting the load to the wheel 605, so that the wheel 605 presses against the grille surface with a set pressure, simulating the vertical load effect of the vehicle tire on the grille.

[0049] The pressure output of the hydraulic cylinder 602 can be steplessly adjusted according to testing requirements, with a maximum output pressure of up to 20 kN, which is sufficient to cover the wheel pressure range of common engineering vehicles and light trucks.

[0050] In addition, a turntable 606 is rotatably mounted in the middle of the slide 601. The turntable 606 has a spline hole 611 coaxially. The spline shaft 603 slides in the spline hole 611. A second servo motor 609 is fixedly mounted on one side of the slide 601. A worm gear 608 is fixedly mounted on the output shaft of the second servo motor 609. At the same time, a worm wheel 607 is fixedly mounted on the turntable 606. The worm wheel 607 is coaxial with the turntable 606 and works in conjunction with the worm gear 608. The second servo motor 609 drives the worm gear 608 to rotate, and the worm gear 608 meshes with the worm wheel 607 to drive the turntable 606 and the spline shaft 603 to rotate synchronously, so as to realize the steering action of the wheel 605 on the grille surface and simulate the dynamic load conditions during the actual driving process of the vehicle.

[0051] The sliding fit design of the spline shaft 603 and the spline hole 611 ensures effective torque transmission and allows the hydraulic cylinder 602 to extend and retract independently in the vertical direction, realizing decoupled control of pressure loading and rotational motion, and improving the flexibility and reliability of the testing system.

[0052] When conducting conditional tests, the linear motor drives the slide 601 to move longitudinally along the frame 3. In conjunction with the steering control of the second servo motor 609, the wheel 605 can complete test modes such as straight driving or fixed-point crushing on the grille surface according to the preset trajectory, so as to comprehensively evaluate the structural response and durability performance of the grille under dynamic loads.

[0053] By combining multiple sensors, an intelligent sensor system is formed, which can collect and analyze key parameters in the testing process in real time. The intelligent sensor system adopts a distributed architecture, and each sensor node interacts with the central control unit through the CAN bus. The sampling frequency is no less than 1 kilohertz to ensure the signal capture accuracy under dynamic loads.

[0054] The following is the specific operating principle of this invention: When conducting comprehensive testing of plastic grating, the grating to be tested is first placed on the base 101, aligning the grating frame with the initial position of the mounting rod 109. The operator starts the equipment through the control panel, and the second electric push rod 110 extends synchronously, driving the insert 111 to insert into the slot 114 and the retaining groove 115 respectively, forming a mechanical lock on the mounting rod 109.

[0055] At this point, the operator can visually inspect the fit between the mounting rod 109 and the grille frame, or inspect it through the vision sensor 506. After confirming that there are no obvious gaps, the operator can proceed to the basic function test.

[0056] Before the basic function test, the frame 3 is moved along the ground rail to the four corner flatness test station. The pin end of the electromagnetic lock 502 extends and inserts into the first notch 105, rigidly fixing the frame 3 to the cover 102.

[0057] The dual-axis linear module 401 drives the mounting bracket 402 to move above the four corners of the grille. The air pump injects compressed air into the fixed cylinder 404 through the air pipe connector 405. The rubber ring 408 pushes the detection rod 406 down, so that the circular plate 407 is at the zero point.

[0058] Subsequently, the dual-axis linear module 401 drives the mounting bracket 402 to move downward, so that the circular plate 407 contacts the grid surface and continues to move downward. Under the obstruction of the grid, the circular plate 407 and the detection rod 406 move upward, so that the displacement sensor 403 records the angle height value, and compares the values ​​of the four displacement sensors 403 to determine whether it is qualified.

[0059] During the basic function test phase, the first electric push rod 106 extends according to a preset program, and drives the mounting rod 109 to apply lateral tension to the grid frame through the connecting frame 107; the tension sensor 108 records the tension value in real time at a specific frequency (such as a sampling frequency of one hundred times per second). When the tension reaches the initial threshold (such as three hundred Newtons), the visual sensor 506 can determine whether the connection node has generated abnormal displacement.

[0060] After the tensile test is completed, the first electric push rod 106 retracts and resets, while simultaneously driving the two mounting rods 109 on both sides to press the grid frame inward, simulating the assembly and pressing condition. The four corner flatness test module 4 and the joint flatness test module 5 are used to determine whether the frame has warped or deformed.

[0061] After the basic function test is passed, the four-corner flatness test module 4 can be repeated to test the four corners of the grille.

[0062] After the four corner flatness test is completed, the frame 3 moves to the seam flatness test station. The ball screw module drives the movable frame 501 to move laterally, so that the seam flatness test module 5 is aligned with the target seam.

[0063] The third electric push rod 513 drives the lifting frame 507 to descend, and the soft strip 508 contacts the surfaces on both sides of the joint. Since the top of the grille is higher than the mounting rod 109, the soft strip 508 pulls the rotating plate 510 to deflect.

[0064] Two angle sensors 512 detect the deflection angle of the rotating plate 510, and the difference is used to calculate the height difference between the two sides of the seam using trigonometric functions. If the height difference exceeds the error (e.g., three millimeters), a vision sensor 506 can be used to capture a high-resolution image of the area for operators to review for defects.

[0065] When it is necessary to inspect the longitudinal seam, the first servo motor 504 drives the connecting plate 505 to rotate 90 degrees, and the electromagnetic lock 502 inserts into the second notch of the limit block 503 to lock the angle, ensuring that the soft strip 508 maintains the correct inspection posture.

[0066] After completing the above static tests, the condition testing phase begins. Hydraulic cylinder 602 pushes wheel 605 to press against the grille surface at a set pressure, and linear motor drives slide 601 to move, simulating the straight-line driving condition of the vehicle.

[0067] The second servo motor 609 drives the worm gear 608 to rotate, which in turn drives the wheel 605 to perform a simulated steering action during driving, simulating the dynamic load when the vehicle changes direction. During the test, the four-corner flatness test module 4 and the joint flatness test module 5 are used to inspect and evaluate the residual deformation of the grille and the loosening of the connectors under cyclic rolling.

[0068] After the test is completed, wheel 605 is raised, frame 3 returns to its initial position, and all test data are summarized to generate a test report, which includes quantitative indicators of each test module, defect location distribution map and comprehensive quality rating.

[0069] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A testing device for plastic grating after molding, characterized in that, include: Basic function test module (1) is used to test the matching and firmness of the connectors of the plastic grid. The frame (3) is positioned above the basic function test module (1); The four-corner flatness test module (4) is set on the front side of the frame (3) and is used to test the flatness of the four corners after the plastic grille is spliced. The seam flatness test module (5) is set on the rear side of the frame (3), and the distance between it and the four corner flatness test module (4) is the same as the length of the plastic grille. It is used to test the seam flatness after the plastic grille is spliced. The condition test module (6) is set above the frame (3) and is used to perform additional condition tests on the spliced ​​plastic grille; The four-corner flatness test module (4) includes: A dual-axis linear module (401) is fixed to the front side of the frame (3), and a mounting bracket (402) is fixedly installed on the movable end of the dual-axis linear module (401). A fixed cylinder (404) is fixedly installed at the four corners of the bottom of the mounting bracket (402), and a detection rod (406) is movably installed inside the fixed cylinder (404). The displacement sensor (403) is fixedly installed on the upper end of the mounting bracket (402) and located above the fixed cylinder (404). The detection rod (406) is used in conjunction with the displacement sensor (403). A circular plate (407) is fixedly installed below the detection rod (406) for contact with the plastic grid; The conditional test module (6) includes: The slide (601) is slidably mounted on the top of the frame (3) and driven by a linear motor; A hydraulic cylinder (602) is fixedly installed on the top of the slide (601), and a connecting plate (610) is rotatably installed on the bottom of the hydraulic cylinder (602). A turntable (606) is rotatably mounted in the middle of a slide block (601). A spline hole (611) is coaxially provided on the turntable (606), and a spline shaft (603) is slidably mounted in the spline hole (611). A wheel frame (604) is fixedly installed at the bottom end of a splined shaft (603), and a wheel (605) is rotatably installed inside the wheel frame (604). The guard (2) is set on both sides of the basic function test module (1) to prevent the frame (3) from leaving the ground rail; The conditional testing module (6) also includes: The second servo motor (609) is fixedly installed on one side of the slide (601), and the output shaft of the second servo motor (609) is fixedly installed with a worm gear (608). The worm gear (607) is fixedly installed on the turntable (606), coaxial with the turntable (606), and used in conjunction with the worm (608); The seam flatness test module (5) includes: The movable frame (501) is slidably mounted on the rear side of the frame (3) and driven by a ball screw module. The bottom of the movable frame (501) is fixedly mounted with a first servo motor (504). The connecting plate (505) is rotatably mounted below the movable frame (501) and fixed to the output shaft of the first servo motor (504); The lifting frame (507) is slidably mounted on the bottom of the connecting plate (505) and driven by the third electric push rod (513); A rotating plate (510) is rotatably installed on one side of the inner wall of the lifting frame (507), and a connecting shaft (511) is fixedly installed on one side. Angle sensor (512) is fixedly installed on both sides of one end of the lifting frame (507) and used in conjunction with the connecting shaft (511); The flexible strip (508) is fixed at both ends to the rotating plate (510) and the lifting frame (507) respectively; The arc-shaped elastic plate (509) is fixed at both ends to the rotating plate (510) and the lifting frame (507).

2. The testing equipment for plastic grating after molding according to claim 1, characterized in that, The four-corner flatness test module (4) also includes: A rubber ring (408) is fixedly installed on the outer circumference of the detection rod (406) and located inside the fixed cylinder (404); The air pipe connector (405) is fixedly installed on one side of the mounting bracket (402) and connected to an external air pump; The gas distribution pipe (409) is fixed at both ends to the gas pipe connector (405) and the fixed cylinder (404) respectively, and is used to discharge gas into the gap between the rubber ring (408) and the top of the fixed cylinder (404).

3. The testing equipment for plastic grating after molding according to claim 1, characterized in that, The basic function test module (1) includes: The base (101) has a cover (102) fixedly installed on its top, and the top of the cover (102) has a through opening (103). The mounting rod (109) is slidably mounted on the base (101) and located around the placement opening (103), and is used in conjunction with the connector of the plastic grille; The limiting bracket (112) is fixed to the side of the mounting rod (109) away from the plastic partition, and a slot (114) is provided at one end of the limiting bracket (112). The second electric push rod (110) is fixedly installed on the top of the base (101). The movable end of the second electric push rod (110) is fixedly installed with a bracket (111), which can be inserted into the slot (114). The L-shaped rod (113) is fixedly installed on the top of the base (101), and a retaining groove (115) is provided on the side near the bracket (111).

4. The testing equipment for plastic grating after molding according to claim 3, characterized in that, The basic function test module (1) also includes: The first electric push rod (106) is fixedly installed above the base (101). A connecting frame (107) is fixedly installed on the movable end of the first electric push rod (106). The connecting frame (107) is slidably connected to the base (101). The tension sensor (108) is fixed at both ends to the connecting frame (107) and the mounting rod (109).

5. The testing equipment for plastic grating after molding according to claim 4, characterized in that, Electromagnetic locks (502) are fixedly installed on one side of both the frame (3) and the movable frame (501). An L-shaped plate (104) is fixedly installed on the top of the cover (102). A first notch (105) is opened on the top of the L-shaped plate (104). The first notch (105) is used in conjunction with the electromagnetic lock (502). A limiting block (503) is fixedly installed on the top of the connecting plate (505), and the limiting block (503) is used in conjunction with the electromagnetic lock (502); Visual sensors (506) are fixedly installed at both ends of the connecting plate (505).

6. A method for inspecting plastic grating after molding, applicable to the plastic grating after molding inspection equipment as described in claim 1, characterized in that, Includes the following steps: Step 1: First, place the plastic grid to be tested on the basic function test module (1) and complete the assembly of the plastic grid. The basic function test module (1) first conducts a basic screening of the matching degree of each connector of the grid and the fastening firmness. Only after ensuring that the connectors are not loose or misaligned can the subsequent testing steps be carried out. Step 2: Then the frame (3) drives the four corner flatness test module (4) to move to the four corners of the grille. The four corner flatness test module (4) uses a contact measuring head to scan the four corners of the grille. The measuring head directly contacts the grille surface to obtain height data, which effectively avoids the signal interference problem caused by surface reflection or small protrusions of the laser sensor. The measurement data is transmitted to the control system in real time for comparison and analysis. If the height difference of the four corners exceeds the preset threshold, the abnormal point is automatically marked and an alarm is triggered. Step 3: At the same time, the seam flatness test module (5) moves synchronously to the grid seam position. Taking advantage of the equal spacing with the four corner flatness test module (4), the flatness of the seam area can be evaluated when the four corners are tested. By collecting the height fluctuation data at the seam, it can be determined whether there is a warping defect in the seam. Step 4: After completing the static flatness test, the condition test module (6) starts the dynamic simulation test program; first, the vehicle simulated load test is carried out. The hydraulic loading device of the condition test module (6) applies vertical pressure to the grille surface according to the standard load distribution. The pressure value increases step by step and maintains a stable loading state. During this process, the four corner flatness test module (4) and the joint flatness test module (5) keep real-time monitoring, record the deformation data of the grille under load, and analyze the displacement change trend of the connector under pressure. Step 5: After the load test, the vehicle simulated turning test stage is entered. The deflection mechanism of the condition test module (6) applies horizontal shear force and torque to the grille to simulate the lateral stress generated when the vehicle turns. The frame (3) adjusts the angle to restore the stress situation under different turning radii. During the test, the stress response data of each connection node of the grille is continuously collected to generate a complete stress distribution cloud map. Step Six: After all the test items are completed, the control system integrates four types of data: basic function test, four corner flatness, joint flatness and condition test, to establish a comprehensive performance file for this batch of plastic gratings.

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