A tubular plastic surface deformation detection device and a detection method thereof

Abstract

The application discloses a kind of tubular plastic surface deformation detection device and its detection method, it is related to deformation detection technical field.The device includes detection table, rotating device, ranging sensor and PLC controller;Servo motor of rotating device drives roll to drive tubular plastic rotation, ranging sensor gathers pipe material whole circumference surface distance data and is fed back to PLC controller, and PLC compares data to determine the maximum deformation, then control servo motor to adjust the maximum deformation to preset angle, avoid gold stamping area.This device realizes the accurate quantitative detection of tubular plastic deformation, automatically positions and avoids deformation defects, improves gold stamping yield, adapts to various specifications pipe material, can be connected to automatic production line, reduce production cost and manual intervention, solve the gold stamping quality problem caused by the deformation of tubular plastic itself.

Description

Technical Field

[0001] This application relates to the field of deformation detection technology, and in particular to a device and method for detecting surface deformation of tubular plastics. Background Technology

[0002] Hot stamping is widely used for the processing of patterns and text markings on the outer wall of plastic pipes due to its excellent decorative effect and strong adhesion. Currently, hot stamping operations on plastic pipes are mostly carried out on both sides of the pipe to meet the needs of product marking and appearance decoration.

[0003] Currently, most plastic pipes are manufactured using injection molding. During injection molding, factors such as mold processing precision, uneven injection pressure distribution, differences in cooling rates, and internal stress release can easily lead to dimensional deviations in the pipe material, including radial deformation, axial bending, and unevenness in the pipe wall. In the subsequent hot stamping process, the deformed areas tend to fall precisely within the pre-set hot stamping area. However, traditional hot stamping equipment often uses a rigid pressing structure, which prevents the hot stamping plate from achieving uniform adhesion to the deformed outer wall of the plastic pipe, resulting in problems such as insufficient or excessive pressure in certain areas.

[0004] The aforementioned problems directly lead to incomplete electroplated aluminum transfer, resulting in incomplete fonts, blurred patterns, and rough edges after hot stamping. At the same time, defects such as wrinkling and peeling of the hot stamping layer are also prone to occur, which greatly reduces the qualified rate of finished plastic tubes, increases production costs, and makes it difficult to meet the stringent requirements for product appearance and marking accuracy in large-scale production. Summary of the Invention

[0005] This invention aims to solve the above-mentioned technical problems and proposes a device and method for detecting surface deformation of tubular plastics. The specific technical solution is as follows: A device for detecting surface deformation of tubular plastic, comprising: Testing station; A rotating device is mounted on a testing platform. The rotating device includes a servo motor and a set of rollers driven by the servo motor. The tubular plastic is placed on the rollers, and the rotation of the rollers can rotate the tubular plastic. A distance measuring sensor is mounted on a testing platform and located below a roller. The distance measuring sensor measures the distance from itself to the surface of the tubular plastic. Since the tubular plastic is rotating, the distance from one circumference of the tubular plastic to the distance measuring sensor is measured to determine the magnitude of deformation at this location. The PLC controller is electrically connected to the servo motor and the ranging sensor. The PLC controller controls the operation of the servo motor, and the ranging sensor feeds back the data it measures to the PLC controller for processing.

[0006] Furthermore, the ranging sensor is a high-precision infrared ranging sensor.

[0007] Furthermore, the test platform includes a base plate parallel to the ground and a vertical plate mounted on the base plate, the servo motor is located on one side of the vertical plate, and the roller is located on the other side of the vertical plate.

[0008] Furthermore, the output shaft of the servo motor is provided with a drive wheel at its end, the vertical plate is also provided with a set of auxiliary wheels, the roller is coaxially provided with a driven wheel, and a synchronous belt is wound around the drive wheel, the auxiliary wheel and the driven wheel.

[0009] Furthermore, the upright plate is provided with a mounting rod, and the ranging sensor is mounted on the mounting rod and can slide along its axial direction.

[0010] A method for detecting surface deformation of tubular plastic, comprising: S1, Place the tubular plastic to be tested on the roller and record the initial position as "0 degrees". The servo motor drives the roller to rotate the tubular plastic. S2, the distance sensor measures the distance from the tubular plastic surface. The distance sensor measures once when the tubular plastic rotates a certain angle, and feeds the measured data back to the PLC sensor. S3, after the tubular plastic rotates one revolution, the ranging sensor collects all the data, and the PLC compares these data. The position with the largest data value corresponds to the position with the largest deformation of the tubular plastic. S4, the servo motor continues to drive the roller to rotate, and the roller rotates with the tubular plastic so that the point of maximum deformation forms a set angle with the horizontal plane; S5, slide to remove the tubular plastic.

[0011] Compared with the prior art, the technical solution of the present invention has the following beneficial technical effects: 1. This invention utilizes a high-precision ranging sensor in conjunction with a PLC control system to measure the full circumference of a rotating tubular plastic tube. The PLC controller analyzes the data, automatically identifies and calculates the exact angular position of the point of maximum deformation, and controls a servo motor to precisely rotate the deformed area, adjusting it to a preset non-hot stamping zone. This design logic completely avoids defects such as incomplete lettering, blurred patterns, wrinkling, and peeling caused by the deformed area entering the hot stamping zone, significantly improving the first-pass yield of the plastic tube hot stamping process.

[0012] 2. The ranging sensor can slide axially on the mounting rod, and the roller assembly can be adapted to tubular plastics of different lengths and diameters. The device does not require large-scale disassembly and modification for different product specifications. It can be compatible simply by adjusting the sensor position, which takes into account both the need for versatility and rapid production changeover, and reduces the cost of equipment changeover.

[0013] 3. The inspection process is fully automated by PLC. After the inspection is completed, the automatic drive motor moves the pipe to the designated position, realizing the full automation of the "inspection-positioning-loading" process, which greatly reduces the intensity of manual intervention and is compatible with the production rhythm of intelligent factories. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a tubular plastic surface deformation detection device according to the present invention; Figure 2 This is a flowchart of a method for detecting surface deformation of tubular plastics according to the present invention.

[0015] In the diagram: 1-Testing platform, 11-Base plate, 12-Pull plate, 13-Drive wheel, 14-Auxiliary wheel, 15-Driven wheel, 16-Synchronous belt, 17-Mounting rod; 2-Rotating device, 21-Servo motor, 22-Roller; 3-Distance sensor. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0017] like Figure 1 As shown: A device for detecting surface deformation of tubular plastic, comprising: Testing station 1; Rotating device 2, which is mounted on the testing table 1, includes a servo motor 21 and a set of rollers 22 driven by the servo motor 21. The tubular plastic is placed on the rollers 22, and the rotation of the rollers 22 can rotate the tubular plastic. The ranging sensor 3 is mounted on the detection platform 1 and is located below the roller 22; The PLC controller is electrically connected to the servo motor 21 and the ranging sensor 3.

[0018] The ranging sensor 3 is a high-precision infrared ranging sensor, and in this embodiment, the measuring accuracy of the ranging sensor 3 is 0.01mm.

[0019] Specifically, the test bench 1 includes a base plate 11 parallel to the ground and a vertical plate 12 vertically mounted on the base plate 11. The servo motor 22 is located on one side of the vertical plate 12, and the roller 22 is located on the other side of the vertical plate 12.

[0020] Specifically, the output shaft of the servo motor 21 is equipped with a drive wheel 13, the vertical plate 12 is also equipped with a set of auxiliary wheels 14, and the roller 22 is coaxially equipped with a driven wheel 15. A synchronous belt 16 is wound around the drive wheel 13, the auxiliary wheel 14, and the driven wheel 15. The servo motor 21 drives the synchronous belt 16 through the drive wheel 13, thereby driving the driven wheel 15 to rotate and driving the roller 22 to rotate. In addition, for scenarios with higher precision requirements, to avoid excessive error between the rotation angle of the roller 22 and the rotation angle of the servo motor 21, users can reasonably adopt a higher precision driving method such as gear set drive.

[0021] The upright plate 12 is equipped with a mounting rod 17, and the distance sensor 3 is mounted on the mounting rod 17 and can slide along its axial direction. The deformation of the tubular plastic is mainly concentrated in its middle position, so the distance sensor 3 only needs to be positioned below the middle. Therefore, for tubular plastics of different lengths, the position of the distance sensor 3 on the mounting rod 17 can be adjusted.

[0022] In addition, for some lightweight tubular plastics with overly smooth surfaces, they are prone to slipping on the roller 22, making it impossible to obtain complete measurements of one revolution. To avoid this, a rubber layer is applied to the surface of the roller 22 to increase friction, and a counterweight can be inserted into the tubular plastic to increase its weight. Furthermore, to prevent axial movement of the tubular plastic during rotation, an axial limiting device can be installed on the base plate 11.

[0023] like Figure 2 As shown A method for detecting surface deformation of tubular plastic, comprising: S1, the tubular plastic to be tested is placed on the roller 22, and the initial position is recorded as "0 degrees". The servo motor 21 drives the roller 22 to rotate the tubular plastic. S2, the distance sensor 3 measures the distance from the tubular plastic surface. The tubular plastic rotates a certain angle and the distance sensor 3 measures once, and feeds back the measured data to the PLC sensor. S3, after the tubular plastic rotates one revolution, the ranging sensor 3 collects all the data, and the PLC compares these data. The position with the largest data value corresponds to the position with the largest deformation of the tubular plastic. S4, the servo motor 21 continues to drive the roller 22 to rotate, and the roller 22 rotates with the tubular plastic so that the point of maximum deformation forms a set angle with the horizontal plane; S5, slide to remove the tubular plastic.

[0024] In practical use, the present invention works as follows: A robotic arm places a tubular plastic tube on roller 22, with the initial position of the tube marked as "0 degrees". Then, a servo motor 21 starts, causing the tube to rotate at a constant speed. For every 2° rotation (or 1° / 0.5° for scenarios requiring high precision), a distance sensor 3 measures the distance. After one full rotation, the distance sensor 3 collects 180 data points. The PLC controller compares these data to determine the location of the maximum deformation and its corresponding angle. The PLC controller then controls the servo motor 21 to continue rotating, ensuring that the location of maximum deformation on the tube forms a 45° angle with the horizontal plane. For example, if the maximum deformation is at 135°, the servo motor 21 will rotate the tube an additional 90°. Subsequently, the robotic arm clamps and moves the tube to the hot stamping area on the hot stamping equipment, ensuring that the location of maximum deformation on the tube avoids the hot stamping area.

[0025] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for detecting surface deformation of tubular plastic, characterized in that, include: Testing station (1); Rotating device (2), the rotating device (2) is set on the testing table (1), the rotating device includes a servo motor (21) and a set of rollers (22) driven by the servo motor (21), the tubular plastic is placed on the rollers (22), and the rotation of the rollers (22) can rotate the tubular plastic. The distance sensor (3) is mounted on the detection platform (1) and is located below the roller (22); The PLC controller is electrically connected to the servo motor (21) and the ranging sensor (3).

2. The tubular plastic surface deformation detection device according to claim 1, characterized in that, The ranging sensor (3) is a high-precision infrared ranging sensor.

3. The tubular plastic surface deformation detection device according to claim 1, characterized in that, The test bench (1) includes a base plate (11) parallel to the ground and a vertical plate (12) vertically mounted on the base plate (11). The servo motor (22) is located on one side of the vertical plate (12), and the roller (22) is located on the other side of the vertical plate (12).

4. The tubular plastic surface deformation detection device according to claim 3, characterized in that, The output shaft of the servo motor (21) is provided with a drive wheel (13), and the vertical plate (12) is also provided with a set of auxiliary wheels (14). The roller (22) is coaxially provided with a driven wheel (15), and a synchronous belt (16) is wound around the drive wheel (13), the auxiliary wheel (14) and the driven wheel (15).

5. The tubular plastic surface deformation detection device according to claim 3, characterized in that, The upright plate (12) is provided with a mounting rod (17), and the distance sensor (3) is provided on the mounting rod (17) and can slide along its axial direction.

6. A method for detecting surface deformation of tubular plastic, implemented based on the tubular plastic surface detection device according to any one of claims 1-5, characterized in that, include: S1, place the tubular plastic to be tested on the roller (22) and record the initial position as "0 degrees". The servo motor (21) drives the roller (22) to rotate the tubular plastic. S2, the distance sensor (3) measures the distance to the surface of the tubular plastic. The tubular plastic rotates a certain angle and the distance sensor (3) measures once, and feeds back the measured data to the PLC sensor. S3, after the tubular plastic rotates once, the ranging sensor (3) collects all the data, and the PLC compares these data. The position with the largest data value corresponds to the position with the largest deformation of the tubular plastic. S4, the servo motor (21) continues to drive the roller (22) to rotate, and the roller (22) rotates with the tubular plastic so that the point of maximum deformation forms a set angle with the horizontal plane; S5, slide to remove the tubular plastic.

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