Online detection device for weld seam of PET (Polyethylene Terephthalate) foam block

Abstract

The utility model relates to a detection device, and discloses a PET (Polyethylene Terephthalate) foam block weld seam on-line detection device which comprises a first bracket, a second bracket, an ultrasonic detection unit, a control unit and a signal processing unit, the ultrasonic detection unit comprises an ultrasonic exciter and an ultrasonic receiver. The first support is provided with at least one ultrasonic exciter, the second support is correspondingly provided with at least one ultrasonic receiver, the ultrasonic exciter and the ultrasonic receiver form an ultrasonic detection surface in the vertical direction, and the ultrasonic detection surface is aligned with the surface where a weld seam to be detected is located. The PET foam block weld seam quality detection device is simple in structure and high in practicability, replaces a manual and offline weld seam detection mode, achieves the purpose of online and real-time monitoring, greatly improves the detection efficiency, and is suitable for detecting the weld seam quality of PET foam blocks of various models.

Description

Technical Field

[0001] This utility model relates to a detection device, specifically an online detection device for weld seams of PET foam blocks. Background Technology

[0002] To facilitate the transportation, stacking, and storage of PET foam boards, they need to be welded together in a heat-sealing machine to form large-volume PET foam blocks. Heat-sealing uses a localized heating method. First, the surfaces of the two PET foam boards to be joined are heated to a molten state inside the heat-sealing machine. Then, the two adjacent PET foam boards are brought into contact and pressed together to fuse them into a single unit, forming a weld seam at the bonding point. The weld seam quality needs to be inspected during production. Currently, the weld seam inspection for large-volume plastic foam blocks uses offline inspection equipment, meaning inspection must be performed after the PET foam block is welded. Furthermore, because the weld seam of the PET foam block is in a difficult-to-access area, manual inspection cannot detect the internal weld seam quality. Existing offline inspection equipment is also not designed for large objects. Therefore, a slitting machine is needed to cut the PET foam block to different thicknesses before the internal weld seam condition can be inspected. In production, it is also required that the welded PET foam block be left to stand for more than seven days before slitting. Therefore, the inspection time for the weld seam quality of the PET foam block after welding is too long, and the welding status of the heat sealing machine cannot be reflected in time based on the inspection results, which seriously affects the inspection efficiency and product quality. Utility Model Content

[0003] To address the aforementioned shortcomings in existing technologies, this utility model aims to provide an online detection device for PET foam weld seams, used to detect the state of weld seams in PET foam blocks after welding on a heat sealing machine. This achieves the goal of real-time detection of weld seams during the welding process of large-volume PET foam blocks, thereby improving weld seam detection efficiency and product quality.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An online detection device for weld seams of PET foam blocks includes a first support, a second support, an ultrasonic detection unit, a control unit, and a signal processing unit. The first support and the second support are respectively placed on both sides of the PET foam block in the welding discharge direction. The ultrasonic detection unit includes an ultrasonic exciter and an ultrasonic receiver. At least one ultrasonic exciter is provided on the first support, and at least one ultrasonic receiver is provided on the second support. The ultrasonic exciter and the ultrasonic receiver form an ultrasonic detection surface in the vertical direction. The ultrasonic detection surface is aligned with the surface where the weld seam to be detected is located. The ultrasonic detection unit is communicatively connected to the control unit and the signal processing unit.

[0005] As a limitation of this utility model: vertical slide rails are fixed on the surface of the first bracket and the second bracket facing the PET foam block. The ultrasonic exciter and ultrasonic receiver are slidably placed in the slide rails. The ultrasonic exciter and ultrasonic receiver are electrically connected to the driving component for driving and controlling their sliding along the slide rails. The driving component is communicatively connected to the control unit.

[0006] As a limitation of this utility model: the bottom of the first support and the second support are respectively provided with support rails, the support rails are arranged along the discharge direction, and the first support and the second support move in the support rails along the discharge direction of the PET foam block.

[0007] As a limitation of this utility model: the ultrasonic testing surface is aligned with the newly completed weld seam.

[0008] As a limitation of this utility model, the number of ultrasonic exciters and ultrasonic receivers are each 2.

[0009] By adopting the above technical solution, the beneficial effects achieved by this utility model compared with the prior art are as follows:

[0010] (1) This utility model sets up an online detection device for weld seams at the outlet of PET foam blocks. The state of weld seams is detected by ultrasonic penetration method. The online detection of weld seam state is carried out during the time interval between the completion of the welding of the previous PET foam board and the welding of the next PET foam board. By monitoring the welding quality of weld seams in real time, the occurrence and expansion process of weld seam defects can be obtained, the cause of defects can be determined, and the heat sealing machine can be adjusted in time. The periodic detection of weld seams is changed to online real-time detection, so that the quality of weld seams does not have to wait until the PET foam blocks are cut to judge the quality of weld seams.

[0011] (2) The ultrasonic exciter and ultrasonic receiver of this utility model are slidably set on the first support and the second support to increase the detection coverage area, which meets the comprehensive detection requirements for large-volume blocks with long weld seams and there is no detection "dead zone" that the ultrasonic waves cannot cover.

[0012] (3) The support track set under the first support and the second support of this utility model can move the ultrasonic detection surface in the discharge direction. By adjusting its position, it can detect PET foam blocks made of PET foam board of different thicknesses, satisfying various types of PET foam blocks. When it is necessary to focus on the detection of a certain weld seam, the ultrasonic detection surface can be moved by moving the first support and the second support to perform detection at any time.

[0013] In summary, this utility model has a simple structure and strong practicality. It replaces the manual and offline inspection of weld seams and achieves the purpose of online and real-time monitoring. The inspection of weld seams is completed at the same time as the production of PET foam blocks, which greatly improves the inspection efficiency and is suitable for the inspection of the weld seam quality of PET foam blocks. Attached Figure Description

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0015] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the first bracket in an embodiment of the present utility model;

[0017] In the diagram: 1-First support, 2-Second support, 3-PET foam block, 4-Welded seam, 5-Ultrasonic exciter, 6-Slide rail, 7-Support track. Detailed Implementation

[0018] The preferred embodiments of this utility model are described below with reference to the accompanying drawings. It should be understood that the PET foam block weld seam online detection device described herein is a preferred embodiment and is only used for illustration and explanation of this utility model, and does not constitute a limitation thereof.

[0019] The directional terms or positional relationships used in this utility model, such as "up," "down," "left," and "right," are based on the positional relationships in the accompanying drawings of this utility model. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component must have a specific orientation, or that it must be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the content protected by this utility model. Example

[0020] This implementation example Figure 1 , Figure 2 The diagram shows an online detection device for the weld seam of a PET foam block, comprising a first support 1, a second support 2, an ultrasonic detection unit, a control unit (not shown), and a signal processing unit (not shown). The first support 1 and the second support 2 are respectively placed on both sides of the PET foam block 3 in the welding discharge direction. The ultrasonic detection unit includes an ultrasonic exciter 5 and an ultrasonic receiver (not shown). At least one ultrasonic exciter 5 is provided on the first support 1, and at least one ultrasonic receiver is correspondingly provided on the second support 2. In this embodiment, the number of ultrasonic exciters and ultrasonic receivers are two each.

[0021] The ultrasonic exciter 5 and the ultrasonic receiver form an ultrasonic detection surface in the vertical direction. The ultrasonic detection surface is aligned with the surface of the weld seam 4 to be detected. Preferably, the ultrasonic detection surface is aligned with the newly completed weld seam. Of course, the detection position of the ultrasonic detection surface can also be adjusted according to the detection needs.

[0022] The ultrasonic detection unit is communicatively connected to the control unit and the signal processing unit. The ultrasonic exciter 5 and ultrasonic receiver are correspondingly configured, employing online ultrasonic technology. The ultrasonic exciter propagates the ultrasonic signal through the material under test. The ultrasonic wave is reflected or transmitted at the weld seam 4. The ultrasonic receiver receives the reflected or transmitted signal. By processing the received reflected or transmitted signal through the signal processing unit, the state of the weld seam 4 can be determined, and the location and severity of defects in the weld seam 4 can be detected.

[0023] Vertical slide rails 6 are fixed on the side of the first bracket 1 and the second bracket 2 facing the PET foam block 3. An ultrasonic exciter 5 and an ultrasonic receiver are provided. Rollers are provided on the ultrasonic exciter 5 and the ultrasonic receiver. The rollers are placed in the slide rails 6. The ultrasonic exciter 5 and the ultrasonic receiver are connected to the drive component. The drive component is communicatively connected to the control unit. After the control unit sends a movement signal, the drive unit drives it to move.

[0024] In order to detect PET foam blocks 3 formed by welding PET foam boards of different thicknesses and to meet the detection requirements of the weld seams 4 of various types of PET foam blocks 3, in this embodiment, the bottom of the first support 1 and the second support 2 are respectively provided with support rails 7. The support rails 7 are set along the discharge direction. The first support 1 and the second support 2 move in the support rails 7 along the discharge direction of the PET foam blocks 3. Specifically, the bottom of the first support 1 and the second support 2 is provided with several roller structures that can move in the rails of the support rails 7.

[0025] In this embodiment, after each PET foam board is welded by the heat sealing machine, the PET foam block 3 moves along the discharge direction by a displacement length equal to the thickness of the board. During this time, the heat sealing machine heats and presses the new PET foam board to complete the welding process. During this time interval, the ultrasonic detection unit of this detection device detects the weld seam 4. The detection results are processed by the signal processing unit and displayed to the operator. Based on the height of the PET foam block 3, the positions of the ultrasonic exciter 5 and the ultrasonic receiver are adjusted on the support slide rail 7 to achieve comprehensive detection of large, bulky objects with long weld seams 4. Based on the thickness of the PET foam board, the position of the support is adjusted on the support track 7 to ensure that the ultrasonic detection surface is aligned with the surface of the weld seam 4 to be detected.

Claims

1. An online detection device for weld seams of PET foam blocks, comprising a first support, a second support, an ultrasonic detection unit, a control unit, and a signal processing unit, characterized in that: The first support and the second support are respectively placed on both sides of the PET foam block in the welding discharge direction. The ultrasonic detection unit includes an ultrasonic exciter and an ultrasonic receiver. The first support is provided with at least one ultrasonic exciter, and the second support is provided with at least one ultrasonic receiver. The ultrasonic exciter and the ultrasonic receiver form an ultrasonic detection surface in the vertical direction. The ultrasonic detection surface is aligned with the surface where the weld seam to be detected is located. The ultrasonic detection unit is communicatively connected to the control unit and to the signal processing unit.

2. The online detection device for weld seams of PET foam blocks according to claim 1, characterized in that: Vertical slide rails are fixed on the side of the first and second brackets facing the PET foam block. The ultrasonic exciter and ultrasonic receiver are slidably placed in the slide rails. The ultrasonic exciter and ultrasonic receiver are electrically connected to the drive component used to drive and control them to slide along the slide rails. The drive component is communicatively connected to the control unit.

3. The online detection device for weld seams of PET foam blocks according to claim 2, characterized in that: The first and second supports are respectively provided with support tracks at their bottoms. The support tracks are set along the discharge direction, and the first and second supports are slidably set in the support tracks along the discharge direction of the PET foam blocks.

4. An online detection device for weld seams of PET foam blocks according to any one of claims 1 to 3, characterized in that: The ultrasonic testing surface is aligned with the newly completed weld seam.

5. The online detection device for weld seams of PET foam blocks according to claim 4, characterized in that: The number of ultrasonic exciters and ultrasonic receivers are two each.

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