Device for monitoring appearance of polyolefin pipe in real time based on grating interference

Abstract

The utility model discloses a device for monitoring the appearance of a polyolefin pipe in real time based on grating interference, which comprises a frame, a camera obscura, two support guide mechanisms and a grating detection mechanism, the camera obscura is mounted on the frame, the grating detection mechanism comprises a grating support, a grating cylinder and a grating, and the grating cylinder is mounted on the frame. The grating barrel is installed in the camera obscura through the grating support, the multiple pairs of gratings are evenly distributed in the circumferential direction of the grating barrel, each grating comprises a light-emitting assembly and a signal receiving assembly, each pair of light-emitting assembly and signal receiving assembly is installed on the inner wall of the grating barrel, and the light-emitting assemblies and the signal receiving assemblies are distributed in the axial direction of the grating barrel. The two supporting and guiding mechanisms are symmetrically arranged relative to the grating barrel and located outside the two ports of the grating barrel respectively. According to the device, the appearance of the polyolefin pipe can be detected in an all-around and full-time manner, the accuracy is high, the production process can be adjusted in time, defective products are greatly reduced, manpower is saved, and the cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of polyolefin pipe production technology, specifically to a device for real-time monitoring of the appearance of polyolefin pipes based on grating interference. Background Technology

[0002] For manufacturing companies, the appearance of a product is of paramount importance, an essential part of quality control, no less so than the product's performance. To a large extent, the first impression a product's appearance makes on consumers directly influences their acceptance of the product and their subsequent purchasing decisions.

[0003] However, in current continuous extrusion production of polyolefin pipes, the methods for visual inspection of the pipes are very traditional, often relying on manual, intermittent sampling and visual inspection to judge the finished pipes within a certain time period. This sampling inspection method has a significant risk of missed inspections. Judging the appearance of products based on individual visual inspection is prone to large human errors and cannot achieve standardized inspection. Furthermore, if a quality problem is found in the pipes at a certain point in the sampling process, it may be necessary to unpack and re-inspect the previous packages, which consumes labor and time costs and does not allow production operators to make timely and effective adjustments to the production process. Summary of the Invention

[0004] To address the problems existing in the prior art, this utility model provides a device for real-time monitoring of the appearance of polyolefin pipes based on grating interference. This device has a simple structure, is easy to use, and can perform all-round, full-time inspection of the appearance of polyolefin pipes with high accuracy. It can also adjust the production process in a timely manner, significantly reducing the production of defective products, saving manpower, and lowering costs.

[0005] The technical solution adopted to achieve the above-mentioned objectives of this utility model is as follows:

[0006] A device for real-time monitoring of the appearance of polyolefin pipes based on grating interference includes a frame, a dark box, a support and guide mechanism, and a grating detection mechanism. The dark box is mounted on the frame. There are two support and guide mechanisms. The grating detection mechanism and the two support and guide mechanisms are all located in the dark box. The grating detection mechanism includes a grating support, a grating cylinder, and a grating. The grating cylinder is mounted in the dark box through the grating support. There are multiple pairs of gratings, which are evenly distributed along the circumference of the grating cylinder. The grating includes a light-emitting component and a signal-receiving component. Each pair of light-emitting components and signal-receiving components are respectively mounted on the inner wall of the grating cylinder, and the light-emitting components and signal-receiving components are distributed along the axial direction of the grating cylinder. The two support and guide mechanisms are symmetrically arranged about the grating cylinder, and the two support and guide mechanisms are located outside the two ends of the grating cylinder. The two support and guide mechanisms and the grating cylinder are linearly distributed along the direction of movement of the polyolefin pipe.

[0007] The supporting and guiding mechanism includes a lifting bracket and a guide roller. The guide roller is a V-shaped roller and includes a roller body and a roller shaft. The roller body is rotatably mounted on the roller shaft. The roller shaft is perpendicular to the direction of movement of the polyolefin pipe and is horizontally set. The two ends of the roller shaft are respectively mounted on the lifting bracket. The two lifting brackets are respectively mounted on the bottom of the dark box and are located outside the two ends of the grating cylinder.

[0008] The lifting bracket includes a pair of first support vertical rods, the lower ends of which are symmetrically fixed to the bottom of the dark box. Multiple pairs of mounting holes are symmetrically provided on the pair of first support vertical rods. The multiple pairs of mounting holes are distributed sequentially along the vertical direction. The two ends of the roller shaft are respectively engaged with the corresponding pair of mounting holes.

[0009] The grating support includes four second support rods arranged in a square. The lower ends of the four second support rods are fixed to the bottom of the dark box. The upper ends of two of the second support rods are fixedly connected to the two sides of the bottom of one end of the grating tube, and the upper ends of the other two second support rods are fixedly connected to the two sides of the bottom of the other end of the grating tube.

[0010] The aforementioned dark box includes a dark box body with an open top and a dark box cover. The dark box cover covers the open top of the dark box body and forms a closed space with the dark box body.

[0011] The main body of the dark box is square, and the cross-section of the cover is arc-shaped. The cover and the main body are hinged together by a hinge.

[0012] The bottom of the dark box cover is provided with a sealing and light-blocking strip, and a handle is provided on the side of the dark box cover facing away from the hinge.

[0013] The frame includes four legs and four adjustable feet. The four legs are arranged in a square shape. The upper ends of the four legs are fixedly connected to the bottom of the dark box body. The lower outer sides of the four legs are provided with horizontally arranged connecting lugs. The four connecting lugs are arranged in a square shape. The four adjustable feet pass through the four connecting lugs and are threadedly connected to the four connecting lugs.

[0014] The two side walls of the dark box body in the width direction are symmetrically provided with perforations, and soft rubber washers are fixed to the two perforations by bolts.

[0015] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows:

[0016] 1. This device uses the principle of grating interference to conduct all-round monitoring of the appearance of polyolefin pipes through a grating detection mechanism. It not only achieves real-time monitoring and can provide real-time feedback on appearance problems of polyolefin pipes, but also allows operators to make timely adjustments to the production process, which can significantly reduce the generation of waste and lower production costs. At the same time, this device replaces manual monitoring, saves manpower, shortens monitoring time, and improves production efficiency and monitoring accuracy.

[0017] 2. The support and guiding mechanism of this device can support pipes of different sizes, thereby matching pipes of different sizes with the grating detection mechanism and improving the versatility of the device. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the external structure of a device for real-time monitoring of the appearance of polyolefin pipes based on grating interference.

[0019] Figure 2 This is a schematic diagram of the internal structure of a device for real-time monitoring of the appearance of polyolefin pipes based on grating interference.

[0020] Figure 3 Assembly drawing to support the guiding mechanism and the grating detection mechanism.

[0021] Among them, 1-Dark box body, 2-Dark box cover, 3-Hinge, 4-Handle, 5-Sealing light-blocking strip, 6-Soft rubber gasket, 7-Support leg, 8-Adjustable foot, 9-Connecting ear plate, 10-First support vertical rod, 11-Roller body, 12-Roller shaft, 13-Mounting hole, 14-Second support vertical rod, 15-Gradient tube, 16-Light-emitting component, 17-Signal receiving component, 18-Polyolefin pipe. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings.

[0023] The structure of the device for real-time monitoring of the appearance of polyolefin pipes based on grating interferometry provided in this embodiment is as follows: Figure 1-2 As shown, it includes a frame, a dark box, a support and guidance mechanism, and a grating detection mechanism.

[0024] like Figure 1-2 As shown, the darkroom includes a darkroom body 1 with an open top and a darkroom lid 2. The darkroom body 1 is square, and the darkroom lid 2 has an arched cross-section. One side of the darkroom lid 2 is hinged to the top of the darkroom body 1, and the darkroom lid 2 closes onto the open side of the darkroom body 1, forming a closed dark space. A handle 4 is provided on the other side of the darkroom lid 2, allowing it to be easily opened. A black sealing light-shielding strip 5 is attached to the bottom of the darkroom lid 2 to prevent external light sources from affecting the grating detection.

[0025] Symmetrical perforations are provided on both sides of the main body 1 of the darkroom, and soft rubber gaskets 6 are fixed to each perforation by bolts. The perforations are partially sealed by black soft rubber gaskets 6, with only a center hole slightly smaller than the diameter of the polyolefin pipe left on the black soft rubber gaskets 6. When the polyolefin pipe 18 passes through the black soft rubber gaskets 6 into the darkroom, the black soft rubber gaskets 6 can effectively block light.

[0026] like Figure 1 As shown, the frame includes four support legs 7 and four adjusting feet 8. The four support legs 7 are arranged in a square shape, and their upper ends are welded to or riveted to the four corners of the bottom of the dark box body 1. The lower outer sides of the four support legs 7 are each provided with horizontally arranged connecting lugs 9. The four connecting lugs 9 are arranged in a square shape, and the four adjusting feet 8 pass through the four connecting lugs 9 and are threadedly connected to the four connecting lugs 9. The height of the support legs 7 is adjusted by the cooperation of the adjusting feet 8 and the connecting lugs 9.

[0027] The grating inspection mechanism includes a grating support, a grating cylinder 15, and a grating. The grating support includes four second support rods 14, which are arranged in a square pattern. The lower ends of the four second support rods 14 are fixed to the bottom of the dark box body 1. The upper ends of two of the second support rods 14 are fixedly connected to both sides of the bottom of one end of the grating cylinder 15, and the upper ends of the other two second support rods 14 are fixedly connected to both sides of the bottom of the other end of the grating cylinder 15. The grating cylinder 15 is supported and fixed by the grating support, making the grating cylinder 15 coaxial with the polyolefin pipe 18.

[0028] There are six pairs of gratings, evenly distributed along the circumference of the grating cylinder. The grating includes a light-emitting component 16, a signal-receiving component 17, and a controller. Each pair of light-emitting components 16 and signal-receiving components 17 is mounted on the inner wall of the grating cylinder 15, and they are distributed along the axial direction of the grating cylinder 15. The light-emitting component 16 contains a light source and a condenser lens. The condenser lens converts the radial light emitted by the light source into parallel light, which illuminates the polyolefin pipe located at the center of the grating cylinder 15. After reflection from the surface of the polyolefin pipe 18, the light is received by the signal-receiving component 17. The signal-receiving component 17 is connected to the controller via wires. An internal sensor in the signal-receiving component 17 displays the interference image formed by the reflected light on the controller. The controller's software algorithm identifies the interference image; if significant distortion or warping occurs, an alarm indicator light illuminates, triggering a visual defect alarm.

[0029] The structure and principle of the grating here are similar to the defect detection system disclosed in the Chinese utility model patent "A Defect Detection System and Defect Detection Method" (patent number 202010146627.3), in which the light-emitting component 16 is equivalent to the light source module and beam splitting module, and the receiving component is equivalent to the detection module.

[0030] There are two support and guide mechanisms, which are symmetrically arranged about the grating cylinder. The two support and guide mechanisms are located outside the two ports of the grating cylinder 15, and the two support and guide mechanisms and the grating cylinder 15 are distributed in a straight line along the direction of movement of the polyolefin pipe 18.

[0031] The supporting and guiding mechanism includes a lifting bracket and guide rollers, which are V-shaped rollers. Each guide roller includes a roller body 11 and a roller shaft 12, with the roller body 11 mounted on the roller shaft 12 via bearings. The roller shaft 11 is horizontally positioned and perpendicular to the direction of movement of the polyolefin pipe 18. The lifting bracket includes a pair of first supporting vertical rods 10, the lower ends of which are symmetrically fixed to the bottom of the dark box body 1. Multiple pairs of mounting holes 13 are symmetrically provided on each pair of first supporting vertical rods 10, distributed sequentially along the vertical direction. The two ends of the roller shaft 11 are respectively engaged with the corresponding pair of mounting holes 13. The height of the guide rollers can be adjusted using the lifting bracket. Adjusting the height of the two guide rollers ensures that the axis of the polyolefin pipe 18 is aligned with the axis of the grating cylinder, thereby guaranteeing the accuracy of grating detection.

Claims

1. A device for real-time monitoring of the appearance of a polyolefin pipe based on grating interference, characterized by: The utility model provides a kind of polyolefin pipe material detection device, including rack, dark box, support guide mechanism and grating detection mechanism, dark box is installed on rack, support guide mechanism has two, grating detection mechanism and two support guide mechanism are located in dark box, grating detection mechanism includes grating support, grating cylinder and grating, grating cylinder is installed in dark box by grating support, grating has multiple pairs, multiple pairs of gratings are evenly distributed along the circumferential direction of grating cylinder, grating includes light-emitting component and signal receiving component, each pair of light-emitting component and signal receiving component is respectively installed on the inner wall of grating cylinder, and light-emitting component and signal receiving component are distributed along the axial direction of grating cylinder, two support guide mechanisms are symmetrically arranged about grating cylinder, and two support guide mechanisms are located outside the two ports of grating cylinder respectively, two support guide mechanisms and grating cylinder are linearly distributed along the direction of polyolefin pipe material movement.

2. The device for real-time monitoring of the appearance of a polyolefin pipe based on grating interference according to claim 1, characterized in that: The support guide mechanism includes a lifting bracket and a guide roller, the guide roller is a V-shaped roller, the guide roller includes a roller body and a roller shaft, the roller body is rotatably installed on the roller shaft, the roller shaft is perpendicular to the direction of movement of the polyolefin pipe, the roller shaft is horizontally arranged, and the two ends of the roller shaft are respectively installed on the lifting brackets. The two lifting brackets are respectively installed on the bottom of the dark box, and the two lifting brackets are respectively located outside the two ports of the grating cylinder.

3. The device for real-time monitoring of the appearance of a polyolefin pipe based on grating interference according to claim 2, characterized in that: The lifting bracket includes a pair of first support vertical rods, the lower ends of the pair of first support vertical rods are symmetrically fixed to the bottom of the dark box, a plurality of pairs of mounting holes are symmetrically provided on the first support vertical rods, the mounting holes are sequentially distributed along the vertical direction, and the two ends of the roller shaft are respectively connected with a corresponding pair of mounting holes.

4. The device for real-time monitoring of the appearance of a polyolefin pipe based on grating interference according to claim 1, characterized in that: The grating support includes four second support vertical rods, the four second support vertical rods are arranged in a square shape, the lower ends of the four second support vertical rods are fixed to the bottom of the dark box, the upper ends of two of the second support vertical rods are fixedly connected to the two sides of the bottom of one end of the grating cylinder, and the upper ends of the other two second support vertical rods are fixedly connected to the two sides of the bottom of the other end of the grating cylinder.

5. The device for real-time monitoring of the appearance of a polyolefin pipe based on grating interference according to claim 1, characterized in that: The dark box includes a dark box body with an open top and a dark box cover, the dark box cover is hinged to the open top of the dark box body and forms a closed space with the dark box body.

6. The device for real-time monitoring of the appearance of a polyolefin pipe based on grating interference according to claim 5, characterized in that: The dark box body is square-shaped, the cross section of the dark box cover is arc-shaped, and the dark box cover is hinged to the dark box body.

7. The device for real-time monitoring of the appearance of a polyolefin pipe based on grating interference according to claim 6, characterized in that: A sealing and shading strip is provided on the bottom of the dark box cover, and a handle is provided on the side of the dark box cover opposite to the hinge.

8. The device for real-time monitoring of the appearance of a polyolefin pipe based on grating interference according to claim 5, characterized in that: The rack includes four legs and four adjusting feet, the four legs are arranged in a square shape, the upper ends of the four legs are fixedly connected to the bottom of the dark box body, and the lower ends of the four legs are provided with horizontally arranged connecting lugs on the outer sides.

9. The device for real-time monitoring of the appearance of a polyolefin pipe based on grating interference according to claim 5, characterized in that: The two side walls of the dark box body in the width direction are symmetrically provided with through holes, and soft rubber gaskets are fixed to the two through holes by bolts.

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