Cover warping detection device and detection method thereof

Abstract

The invention discloses a cover warping detection device and method, and the device comprises a conveying mechanism which is used for conveying a PET bottle; the self-adaptive adjusting mechanism comprises a mounting frame and a gantry bayonet channel, the mounting frame is arranged on one side of the conveying mechanism, the gantry bayonet channel is provided with a fixing seat, the fixing seat is arranged on the mounting frame in a lifting mode, the gantry bayonet channel is located above the conveying mechanism, and the gantry bayonet channel is arranged on the mounting frame. A slope is arranged at the feeding end of the gantry bayonet channel, and the bottleneck of the PET bottle enters the gantry bayonet channel along the slope; the detection mechanism is used for carrying out cover warping detection on the PET bottle and outputting an induction signal; and the control mechanism comprises a controller and an alarm, the controller is connected with the detection mechanism and the conveying mechanism, and the alarm is connected with the controller.

Description

Technical Field

[0001] The present application relates to the technical field of cover lift detection, and in particular to a cover lift detection device and a detection method thereof. Background Art

[0002] After the PET bottle product is capped, it needs to be inspected. Currently, most of the photoelectric sensors are used to detect the capping degree of the bottle cap to determine whether the bottle cap is in the state of tilting, so as to ensure the sealing of the PET bottle. However, during the hot filling process, due to the increase in temperature, the inside of the PET bottle will expand to a certain extent, causing a certain height difference of the PET bottle after filling, thus affecting the accuracy of the cap tilting detection. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a cap lift detection device that can adapt to PET bottles with height differences due to hot filling, improve the accuracy of detection, and thus ensure product quality.

[0004] The present application also proposes a method for detecting cap lift, which can adapt to PET bottles with height differences due to hot filling, improve the accuracy of detection, and thus ensure product quality.

[0005] The cap lift detection device described in the embodiment of the first aspect of the present application includes: a conveying mechanism for conveying PET bottles; an adaptive adjustment mechanism, including a mounting frame and a gantry bayonet channel, the mounting frame is arranged on one side of the conveying mechanism, the gantry bayonet channel is provided with a fixed seat, the fixed seat is lifted and arranged on the mounting frame, the gantry bayonet channel is located above the conveying mechanism, the feeding end of the gantry bayonet channel is provided with a slope, and the bottleneck of the PET bottle enters the gantry bayonet channel along the slope; a detection mechanism, for performing cap lift detection on the PET bottle and outputting a sensing signal; a control mechanism, including a controller and an alarm, the controller is connected to the detection mechanism and the conveying mechanism respectively, and the alarm is connected to the controller.

[0006] According to the first aspect of the present application, the cover tilting detection device has at least the following beneficial effects: during detection, the conveying mechanism conveys the PET bottle so that the PET bottle enters the gantry bayonet channel along the slope, and the gantry bayonet channel descends along the mounting frame under the gravity of the PET bottle, thereby driving the detection mechanism to descend, and at this time, the fitting surface of the gantry bayonet channel and the bottleneck is used as the reference surface for height detection; the PET bottle continues to move along the gantry bayonet channel, and when the bottle cap is normally installed, the detection mechanism is not triggered, and the alarm does not work; when the bottle cap tilts, the detection mechanism is triggered and outputs a sensing signal, and the alarm sounds an alarm to prompt the staff. Since the height difference of the PET bottle comes from the bottle body, and the part above the bottleneck almost does not produce a height difference, the present application sets the gantry bayonet channel on the mounting frame, so that the gantry bayonet channel can be adjusted in height adaptively under the gravity of the PET bottle, and at this time, the fitting surface of the gantry bayonet channel and the bottleneck is used as the reference surface for height detection, so as to adapt to the PET bottle with height difference due to hot filling, improve the accuracy of detection, and thus ensure product quality.

[0007] According to the cover lift detection device described in the embodiment of the first aspect of the present application, the mounting frame is provided with a slide rail, the fixing seat is provided with a slider, and the slide rail is cooperatively connected with the slider.

[0008] According to the cover lift detection device described in the embodiment of the first aspect of the present application, a return spring is arranged on the top of the mounting frame, and the other end of the return spring is connected to the fixing seat.

[0009] According to the cover lift detection device described in the embodiment of the first aspect of the present application, the fixing seat is provided with a guide rod, the guide rod is slidably inserted into the mounting frame, and the reset spring is sleeved on the guide rod.

[0010] According to the cover lift detection device described in the embodiment of the first aspect of the present application, the fixing seat is provided with a connecting plate for lifting, and the detection mechanism is arranged on the connecting plate.

[0011] According to the cover lift detection device described in the embodiment of the first aspect of the present application, the detection mechanism includes a contact plate and a sensor, the contact plate is movably arranged on the connecting plate, the sensor is arranged on one side of the contact plate, and the sensor is used to sense the swing of the contact plate and output a sensing signal.

[0012] According to the cover lift detection device described in the embodiment of the first aspect of the present application, the connecting plate is provided with a rotating shaft, the contact plate is rotatably connected to the rotating shaft, and the contact plate can swing around the rotating shaft.

[0013] According to the cover lift detection device described in the embodiment of the first aspect of the present application, the fixing seat is provided with an adjusting bolt, and the connecting plate is connected to the adjusting bolt.

[0014] According to the cover lift detection device described in the embodiment of the first aspect of the present application, the control mechanism also includes a time relay, and the time relay is connected to the controller.

[0015] The method for detecting lifted lids according to the second aspect of the present application is applied to the device for detecting lifted lids according to the first aspect of the present application, and the method for detecting lifted lids includes: conveying the PET bottle by the conveying mechanism so that the bottleneck of the PET bottle enters the gantry bayonet channel along the slope; the gantry bayonet channel descends along the mounting frame under the gravity of the PET bottle so that the fitting surface of the gantry bayonet channel and the bottleneck serves as a reference surface for height detection; acquiring the sensing signal of the detection mechanism and causing the alarm to sound an alarm.

[0016] The method for detecting lifted caps as described in the second aspect of the embodiment of the present application has at least the following beneficial effects: during detection, the conveying mechanism conveys the PET bottle so that the PET bottle moves into the gantry bayonet channel along the slope, and the gantry bayonet channel descends along the mounting frame under the gravity of the PET bottle, thereby driving the detection mechanism to descend, and at this time, the fitting surface of the gantry bayonet channel and the bottleneck serves as a reference surface for height detection; the PET bottle continues to move forward along the gantry bayonet channel, and when the bottle cap is installed normally, the contact plate has no contact with the bottle cap and does not swing, and at this time the sensor is not triggered and the alarm does not work; when the bottle cap is lifted, the contact plate swings under the action of the bottle cap, and at this time the sensor is triggered and outputs a sensing signal, and the alarm sounds an alarm to prompt the staff. Since the height difference of the PET bottle comes from the bottle body and there is almost no height difference above the bottleneck, the present application sets the gantry bayonet channel lifting and lowering arrangement on the mounting frame so that the gantry bayonet channel can be adaptively adjusted under the gravity of the PET bottle. At this time, the fitting surface of the gantry bayonet channel and the bottleneck is used as the reference plane for height detection, and since the detection mechanism moves with the gantry bayonet channel, the position of the detection mechanism and the reference plane remains unchanged. At this time, detection through the detection mechanism can improve the accuracy of detection, thereby ensuring product quality.

[0017] The method for detecting lifted caps according to the second aspect of the embodiment of the present application includes: when the bottle cap is normally installed, the contact plate does not swing, the sensor is not triggered, and the alarm does not work; when the bottle cap is lifted, the contact plate swings, the sensor is triggered and outputs a sensing signal, and the alarm sounds an alarm.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic structural diagram of a cover lift detection device according to an embodiment of the first aspect of the present application; Figure 2 This is a schematic structural diagram of the cap lift detection device of the first embodiment of the present application when the bottle cap is normally installed; Figure 3 This is a schematic structural diagram of a cap lift detection device in the first embodiment of the present application when a cap lift occurs; Figure 4 This is a structural block diagram of a cover lift detection device according to a first embodiment of the present application; Figure 5 Flow chart of a cover lift detection method according to the second embodiment of the present application.

[0021] Description of reference numerals: Conveying mechanism 100; PET bottle 110; bottleneck 120; bottle cap 130; mounting frame 210; gantry bayonet channel 220; fixing seat 230; ramp 240; slide rail 250; slider 260; return spring 270; guide rod 280; connecting plate 290; detection mechanism 300; adjusting bolt 310; contact plate 320; sensor 330; rotating shaft 340; controller 410; alarm 420; time relay 430. DETAILED DESCRIPTION

[0022] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0023] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0024] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of first and second, this is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0025] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation, connection and connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] Reference Figures 1 to 4 The embodiment of the present application provides a cap lift detection device, including: a conveying mechanism 100, used to convey PET bottles 110; an adaptive adjustment mechanism, including a mounting frame 210 and a gantry bayonet channel 220, the mounting frame 210 is arranged on one side of the conveying mechanism 100, the gantry bayonet channel 220 is provided with a fixing seat 230, the fixing seat 230 is lifted and arranged on the mounting frame 210, the gantry bayonet channel 220 is located above the conveying mechanism 100, and a slope 240 is arranged at the feeding end of the gantry bayonet channel 220, and the bottleneck 120 of the PET bottle 110 enters the gantry bayonet channel 220 along the slope 240; a detection mechanism 300, used to perform cap lift detection on the PET bottle 110 and output a sensing signal; a control mechanism, including a controller 410 and an alarm 420, the controller 410 is connected to the detection mechanism 300 and the conveying mechanism 100 respectively, and the alarm 420 is connected to the controller 410.

[0027] During the inspection, the conveying mechanism 100 conveys the PET bottle 110 so that the PET bottle 110 enters the gantry bayonet channel 220 along the slope 240. Then, the gantry bayonet channel 220 descends along the mounting frame 210 under the gravity of the PET bottle 110, thereby driving the inspection mechanism 300 to descend. At this time, the fitting surface of the gantry bayonet channel 220 and the bottleneck 120 serves as the reference surface for height inspection. The PET bottle 110 continues to move forward along the gantry bayonet channel 220. When the bottle cap 130 is installed normally, the inspection mechanism 300 is not triggered and the alarm 420 does not work. When the bottle cap 130 is lifted, the inspection mechanism 300 is triggered and outputs a sensing signal, and the alarm 420 sounds an alarm to alert the staff. Since the height difference of the PET bottle 110 comes from the bottle body, and there is almost no height difference above the bottleneck 120, the present application sets the gantry bayonet channel 220 to be lifted and lowered on the mounting frame 210, so that the gantry bayonet channel 220 can be adaptively adjusted under the gravity of the PET bottle 110. At this time, the fitting surface between the gantry bayonet channel 220 and the bottleneck 120 is used as the reference surface for height detection, so as to adapt to the PET bottle 110 with height difference due to hot filling, improve the accuracy of detection, and thus ensure product quality.

[0028] Reference Figures 1 to 3 Further, the mounting frame 210 is provided with a slide rail 250, and the fixing seat 230 is provided with a slider 260, and the slide rail 250 is connected with the slider 260. After the bottleneck 120 of the PET bottle 110 enters the gantry bayonet channel 220 along the slope 240, under the gravity of the PET bottle 110, the fixing seat 230 drives the gantry bayonet channel 220 to descend along the slide rail 250. At this time, the fitting surface of the gantry bayonet channel 220 and the bottleneck 120 is used as the reference surface for height detection, so as to adapt to PET bottles 110 of different heights, improve the accuracy of detection, and ensure product quality. It can be imagined that a return spring 270 is provided at the top of the mounting frame 210, and the other end of the return spring 270 is connected to the fixing seat 230. When the PET bottle 110 leaves the gantry bayonet channel 220, the gantry bayonet channel 220 can rise along the slide rail 250 under the action of the return spring 270 to wait for the next round of detection, thereby improving the accuracy of detection. It is easy to understand that the fixing seat 230 is provided with a guide rod 280, the guide rod 280 is slidably arranged on the mounting frame 210, and the return spring 270 is sleeved on the guide rod 280. By providing the guide rod 280, a certain guiding effect can be played on the return spring 270, so as to prevent the return spring 270 from deflecting and improve the accuracy of detection.

[0029] In this embodiment, the fixing seat 230 is provided with a connecting plate 290 for lifting, and the detection mechanism 300 is provided on the connecting plate 290. Since the heights of the bottlenecks 120 of PET bottles 110 of different specifications are also different, the present application sets the connecting plate 290 to the fixing seat 230 for lifting, so that the connecting plate 290 can be lifted and lowered along the fixing seat 230, thereby achieving the height adjustment of the detection mechanism 300 and expanding the scope of application. Specifically, the fixing seat 230 is provided with an adjusting bolt 310, and the connecting plate 290 is connected to the adjusting bolt 310. By screwing the adjusting bolt 310, the connecting plate 290 is lifted and lowered, thereby achieving the height adjustment of the detection mechanism 300, which has a simple structure and is easy to operate.

[0030] Reference Figures 1 to 3 , the detection mechanism 300 includes a contact plate 320 and a sensor 330, the contact plate 320 is movably arranged on the connecting plate 290, the sensor 330 is arranged on one side of the contact plate 320, and the sensor 330 is used to sense the swing of the contact plate 320 and output a sensing signal. When the bottle cap 130 is normally installed, the contact plate 320 does not contact the bottle cap 130, at this time the contact plate 320 does not swing, the sensor 330 is not triggered, and the alarm 420 does not work; when the bottle cap 130 is lifted, the contact plate 320 contacts the bottle cap 130, the contact plate 320 swings, the sensor 330 is triggered and outputs a sensing signal, and the alarm 420 sounds an alarm. By adopting the above method to detect the lifted cover, the accuracy of the detection can be improved and the product quality can be guaranteed. Among them, the sensor 330 is set as a beam-type optical fiber sensor 330. Of course, the sensor 330 can also select a beam-type photoelectric, diffuse photoelectric, etc. with a small optical axis, and this application does not limit this.

[0031] In this embodiment, the connecting plate 290 is provided with a rotating shaft 340, and the contact plate 320 is rotatably connected to the rotating shaft 340, and the contact plate 320 can swing around the rotating shaft 340. When the bottle cap 130 is lifted, the top height of the bottle cap 130 is above the contact plate 320, and the contact plate 320 swings around the rotating shaft 340, thereby triggering the sensor 330, and the sensor 330 outputs a sensing signal to the conveying mechanism 100 and the alarm 420, so that the alarm 420 sounds an alarm.

[0032] Reference Figure 4In some embodiments, the control mechanism further includes a time relay 430, which is connected to the controller 410. Specifically, when the sensor 330 senses the cover being lifted, it will output a sensing signal, at which time the alarm 420 starts to work to sound an alarm, and at the same time, the time relay 430 starts timing; when the time relay 430 reaches the set time, the time relay 430 automatically resets, and the alarm 420 stops working to wait for the next round of detection. It should be noted that the set time of the time relay 430 must be less than the time for the next PET bottle 110 to arrive at the detection mechanism 300, so as to ensure the stability and safety of subsequent detection, and there is no need for the operator to manually reset it, which not only gives an alarm prompt, but also reduces the labor intensity of the operator and improves work efficiency.

[0033] Reference Figure 5 The second embodiment of the present application provides a method for detecting a cover lift, which is applied to the cover lift detection device described in the first embodiment of the present application. The cover lift detection method includes but is not limited to step S110, step S120 and step S130.

[0034] Step S110 : The conveying mechanism 100 conveys the PET bottle 110 , so that the bottleneck 120 of the PET bottle 110 enters the gantry bayonet passage 220 along the slope 240 .

[0035] Specifically, the conveying mechanism 100 conveys the PET bottle 110 so that the PET reaches the feeding end of the gantry bayonet channel 220. At this time, the bottleneck 120 of the PET bottle 110 enters the gantry bayonet channel 220 along the slope 240, so as to facilitate the subsequent cap lift detection of the PET bottle 110. By setting the slope 240, the bottleneck 120 of the PET bottle 110 can enter the gantry bayonet channel 220, which has a simple structure and is easy to operate.

[0036] Step S120: the gantry bayonet channel 220 descends along the mounting frame 210 under the gravity of the PET bottle 110, so that the fitting surface between the gantry bayonet channel 220 and the bottleneck 120 is used as a reference surface for height detection.

[0037] By adopting the above structure, the height of the gantry bayonet channel 220 can be adaptively adjusted. At this time, the fitting surface between the gantry bayonet channel 220 and the bottleneck 120 is used as the reference surface for height detection, so that it can be applicable to PET bottles 110 with height differences due to hot filling, thereby improving the accuracy of detection and ensuring product quality.

[0038] Step S130: Acquire the sensing signal of the detection mechanism 300 and make the alarm 420 sound an alarm.

[0039] Specifically, when the bottle cap 130 is installed normally, the contact plate 320 does not swing, the sensor 330 is not triggered, and the alarm 420 does not work; when the bottle cap 130 is lifted, the contact plate 320 swings, the sensor 330 is triggered and outputs a sensing signal, and the alarm 420 sounds an alarm. By using the above method to detect lifted caps, the accuracy of detection can be improved and product quality can be guaranteed.

[0040] During the inspection, the conveying mechanism 100 conveys the PET bottle 110 so that the PET bottle 110 enters the gantry bayonet channel 220 along the slope 240. Then, the gantry bayonet channel 220 descends along the mounting frame 210 under the gravity of the PET bottle 110, thereby driving the inspection mechanism 300 to descend. At this time, the fitting surface of the gantry bayonet channel 220 and the bottleneck 120 serves as the reference surface for height inspection. The PET bottle 110 continues to move forward along the gantry bayonet channel 220. When the bottle cap 130 is installed normally, the inspection mechanism 300 is not triggered and the alarm 420 does not work. When the bottle cap 130 is lifted, the inspection mechanism 300 is triggered and outputs a sensing signal, and the alarm 420 sounds an alarm to alert the staff. Since the height difference of the PET bottle 110 comes from the bottle body, and there is almost no height difference above the bottleneck 120, the present application sets the gantry bayonet channel 220 to be lifted and lowered on the mounting frame 210, so that the gantry bayonet channel 220 can be adaptively adjusted under the gravity of the PET bottle 110. At this time, the fitting surface between the gantry bayonet channel 220 and the bottleneck 120 is used as the reference surface for height detection, so as to adapt to the PET bottle 110 with height difference due to hot filling, improve the accuracy of detection, and thus ensure product quality.

[0041] In the description of the present application, the description with reference to the terms "one embodiment, some embodiments, illustrative embodiments, examples, specific examples or some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0042] The terms "first, second, third, fourth", etc. (if any) in the specification and claims of this application and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments described herein can be implemented in an order other than that shown or described herein.

[0043] It should also be noted that in the description of this application, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0044] In addition, the terms "comprises" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may also include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0045] Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0046] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present application.

Claims

1. A cover lift detection device, characterized in that: include: A conveying mechanism for conveying PET bottles; The adaptive adjustment mechanism comprises a mounting frame and a gantry bayonet channel, wherein the mounting frame is arranged at one side of the conveying mechanism, the gantry bayonet channel is provided with a fixing seat, the fixing seat is lifted and lowered on the mounting frame, the gantry bayonet channel is located above the conveying mechanism, and a ramp is arranged at the feeding end of the gantry bayonet channel, and the bottleneck of the PET bottle enters the gantry bayonet channel along the ramp; A detection mechanism, used for detecting the cap lift of the PET bottle and outputting a sensing signal; The control mechanism comprises a controller and an alarm. The controller is connected to the detection mechanism and the conveying mechanism respectively, and the alarm is connected to the controller.

2. The cover lift detection device according to claim 1, characterized in that: The mounting frame is provided with a slide rail, the fixing seat is provided with a slide block, and the slide rail is cooperatively connected with the slide block.

3. The cover lift detection device according to claim 2, characterized in that: A return spring is arranged on the top of the mounting frame, and the other end of the return spring is connected to the fixing seat.

4. The cover lift detection device according to claim 3, characterized in that: The fixing seat is provided with a guide rod, the guide rod is slidably penetrated through the mounting frame, and the return spring is sleeved on the guide rod.

5. The cover lift detection device according to claim 1, characterized in that: The fixing seat is provided with a connecting plate for lifting, and the detecting mechanism is arranged on the connecting plate.

6. The cover lift detection device according to claim 5, characterized in that: The detection mechanism comprises a contact plate and a sensor. The contact plate is movably arranged on the connecting plate. The sensor is arranged on one side of the contact plate. The sensor is used to sense the swing of the contact plate and output a sensing signal.

7. The cover lift detection device according to claim 6, characterized in that: The connecting plate is provided with a rotating shaft, the contact plate is rotatably connected to the rotating shaft, and the contact plate can swing around the rotating shaft.

8. The cover lift detection device according to claim 5, characterized in that: The fixing seat is provided with an adjusting bolt, and the connecting plate is connected to the adjusting bolt.

9. The cover lift detection device according to claim 1, characterized in that: The control mechanism further comprises a time relay, and the time relay is connected to the controller.

10. A method for detecting a cap lift, characterized in that: Applied to the cover lift detection device according to any one of claims 1 to 9, the cover lift detection method comprises: The conveying mechanism conveys the PET bottle so that the bottleneck of the PET bottle enters the gantry bayonet channel along the slope; The gantry bayonet channel descends along the mounting frame under the gravity of the PET bottle, so that the fitting surface between the gantry bayonet channel and the bottle neck serves as a reference surface for height detection; The sensing signal of the detection mechanism is obtained, so that the alarm device sounds an alarm.

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