Label printing quality detection equipment

Abstract

The utility model relates to label printing quality detection equipment which comprises a rack, and a pressing device used for ensuring the tension degree in the label conveying process is installed on the rack. An unwinding roller used for unwinding a label roll, a deviation correcting assembly used for ensuring that the label conveying direction is centered, a first detecting assembly used for detecting the label quality, a first remaining assembly used for remaining unqualified labels and a cutting assembly used for cutting the labels are sequentially arranged on the machine frame in the conveying direction. The second detection assembly is used for detecting the cut labels, the second indwelling assembly is used for indwelling unqualified labels after secondary detection, and the winding roller is used for winding the labels. By adopting the technical scheme, the label is cut into a plurality of label strips while the quality of the label is detected, the use is simple and efficient, and the quality of the label is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of label printing detection, and in particular to a label printing quality detection device. Background Art

[0002] Labels are an effective carrier for enterprises to track products, monitor quality and manage production. They are also an effective tool for ordinary consumers to check products. However, in actual production, labels are affected by uncertain factors such as production process, environment and equipment, and there are various printing defects and errors. In order to improve the quality of label printing and avoid unqualified labels from entering the market, labels are often subject to strict quality inspections after printing.

[0003] When the label printing quality inspection equipment in the prior art is used, the printed label roll is usually placed on the unwinding roller, the label roll is unwound by rotating the unwinding roller, and then the label is rewound by the rewinding roller. During the unwinding process, the label is conveyed by the conveyor roller and passed under the detection head to complete the inspection. When there are unqualified labels in the inspected label roll, the entire roll of label needs to be removed, and then the unqualified labels are removed by the staff, and then the roll is rolled up and transported to the cutting station. The overall operation is relatively cumbersome, the inspection efficiency is low, and it is not conducive to use. Utility Model Content

[0004] In order to achieve the purpose of improving detection efficiency while detecting label printing quality, the present application provides a label printing quality detection device.

[0005] The present application provides a label printing quality inspection device, which adopts the following technical solution:

[0006] A label printing quality inspection device, which includes a frame on which a clamping device for ensuring the tension of the label during conveying is installed, and the frame is provided with an unwinding roller for unwinding the label roll, a correction component for ensuring the centering of the label conveying direction, a first inspection component for inspecting the quality of the label, a first retention component for retaining unqualified labels, a cutting component for cutting the labels, a second inspection component for inspecting the cut labels, a second retention component for retaining unqualified labels after secondary inspection, and a winding roller for winding the labels in sequence along the conveying direction.

[0007] By adopting the above technical solution, when in use, the staff puts the label roll on the unwinding roller, unwinds the label roll through the unwinding roller, and ensures that the label is always kept in a tensioned state during the conveying process through the clamping device. During the label conveying process, the label is first transmitted through the correction component, and the label transmission direction is corrected at the same time to avoid the deviation of the label affecting the detection accuracy. The label is then inspected for the first time through the first detection component. When an unqualified label is detected, the first detection component transmits a signal to the external PLC device, and the PLC device receives and processes the signal. Thereafter, the PLC device controls the entire device to stop running, so that the unqualified label is retained at the first retention component. After the staff manually removes the unqualified label and replaces it with a qualified label, the staff controls the PLC again. The device restarts the device and transports the inspected label to the cutting component, which cuts the entire label into long strips, and then continues to transport it to the second inspection component, where the cut label is re-inspected. When an unqualified label is detected, the second inspection component transmits a signal to the external PLC device, which receives and processes the signal. The PLC device then controls the device to stop running again, so that the unqualified label is retained in the second retention component. After the staff manually removes the unqualified label and replaces it with a qualified label, the PLC device can be controlled to continue running, thereby winding the label into multiple small label rolls through the winding roller. While ensuring the quality of label printing, it improves work efficiency and is simple and convenient to use.

[0008] Preferably, the pressing device comprises a pressing roller mounted on the frame, and a plurality of the pressing rollers are provided, and the plurality of the pressing rollers are arranged at intervals along the label conveying direction.

[0009] By adopting the above technical solution, the pressing roller is used to ensure that the label paper is always in a tensioned state during transportation, thereby avoiding wrinkles on the label due to low elasticity during transportation.

[0010] Preferably, the deflection correction assembly includes a support base fixedly connected to the frame and a deflection corrector installed on the support base.

[0011] By adopting the above technical solution, a deviation corrector is installed on the frame during use to ensure that the label remains centered before being transported to the first detection component for detection, thereby avoiding deviation of the label during transportation and affecting the detection of the first detection component.

[0012] Preferably, the first detection component includes a first mounting base arranged on the frame, a first lighting panel fixedly connected to the first mounting base, and a first camera detector fixed to the first mounting base. The first detection component is located above the label, and the detection head of the first camera detector is set toward the label.

[0013] By adopting the above technical solution, qualified labels are entered into the first camera detector in advance during use. When the detected label is transported to the bottom of the detection head of the first camera detector, the first camera detector takes a picture of the label and compares it with the sample. When it is found that the detected label does not match the sample, the first camera detector sends a signal to the PLC device, and the PLC device controls the entire device to stop running, thereby realizing quality inspection of the label. During the inspection process, the first lighting panel is used to increase the illumination of the label to avoid the influence of dark light on the accuracy of the inspection result.

[0014] Preferably, the first retention assembly includes a first retention platform fixed on the frame, and a first guide roller rotating on the first retention platform, and two first guide rollers are provided, and the two first guide rollers are respectively located at two ends of the first retention platform.

[0015] By adopting the above technical solution, the labels are transported to the first retention table by the rotation of the first guide roller during use. When the equipment stops running, unqualified labels remain on the first retention table, which makes it convenient for staff to manually remove unqualified labels and replace them with qualified labels, thereby ensuring that the quality of the labels finally packaged into rolls is intact.

[0016] Preferably, a control switch for controlling the start-up of the entire device is provided on the first retention table.

[0017] By adopting the above technical solution, by setting a control switch during use, it is convenient for the staff to manually adjust the conveying efficiency of the overall equipment, and it is also convenient to emergency stop the operation of the equipment, so that the staff can maintain the equipment.

[0018] Preferably, the cutting assembly includes a rotating shaft rotating on the frame, a cutter fixed on the rotating shaft, and a driving motor for driving the rotating shaft to rotate. A plurality of cutters are provided, and the plurality of cutters are evenly spaced along the axial direction of the rotating shaft. The driving motor is installed on the frame, and the main shaft of the driving motor is coaxially fixedly connected to the rotating shaft.

[0019] By adopting the above technical solution, the whole label is cut into strip labels by the cutting component during use, which is convenient for subsequent packaging of the labels without the need to cut the labels separately, and is more convenient to use.

[0020] Preferably, the second detection component includes a second mounting base arranged on the frame, a second lighting panel fixedly connected to the second mounting base, and a second camera detector fixed to the second mounting base, the second detection component is located above the label, and the detection head of the second camera detector is set toward the label.

[0021] By adopting the above technical solution, the cut labels are subjected to secondary inspection by a second camera detector during use. On the one hand, it is detected whether there are any missing labels after cutting. On the other hand, the labels are subjected to secondary inspection to ensure that all labels are of qualified quality.

[0022] Preferably, the second retention assembly includes a second retention table fixed on the frame, and a second guide roller rotating on the second retention table, and two second guide rollers are provided, and the two second guide rollers are respectively located at two ends of the second retention table.

[0023] By adopting the above technical solution, a second retention table is set up during use, which makes it easier for staff to remove and replace unqualified labels after the second inspection, making it more convenient to use.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. During use, the pressing device is used to ensure that there will be no wrinkles during the label transportation process. The label is corrected by the corrector to prevent the label transportation deflection from affecting the accuracy of the test result. The label is tested by the first detection component. When an unqualified label is detected, the device can be stopped in time through the PLC device, so that the staff can remove the unqualified label and replace it with a qualified label. The overall use is simple and convenient, ensuring the integrity of the label quality and improving work efficiency;

[0026] 2. By setting a cutting component to directly cut the detected labels, the work efficiency is improved, and the cumbersomeness of the existing technology of transporting the detected labels and cutting the labels separately is avoided, which is simple and convenient to use;

[0027] 3. By setting up a second detection component to perform a secondary quality inspection on the cut labels, the accuracy of label quality inspection is improved, ensuring that the labels are not damaged after being cut, etc., and are more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is an axonometric diagram mainly showing the overall structure in the embodiment of the present application;

[0029] Figure 2 It is an axonometric diagram mainly showing the internal structure in the embodiment of the present application;

[0030] Figure 3 It is an axonometric schematic diagram mainly showing the structure of the clamping device in the embodiment of the present application;

[0031] Figure 4 It is an axonometric diagram mainly showing the structure of the deviation correction component in the embodiment of the present application;

[0032] Figure 5 is an axonometric diagram mainly showing the structure of the first detection assembly in the embodiment of the present application;

[0033] Figure 6 is an axonometric diagram mainly showing the structure of the first retention assembly in the embodiment of the present application;

[0034] Figure 7 is an axonometric schematic diagram mainly showing the structure of the first auxiliary replacement assembly in the embodiment of the present application;

[0035] Figure 8 It is an axonometric diagram mainly showing the structure of the cutting assembly in the embodiment of the present application;

[0036] Fig. 9 is an axonometric diagram mainly showing the structure of the second detection assembly in the embodiment of the present application;

[0037] Fig.10 It is an axonometric schematic diagram mainly reflecting the structure of the second retention component in the embodiment of the present application.

[0038] Reference numerals: 1, frame; 2, clamping device; 21, clamping roller; 3, unwinding roller; 4, deviation correction component; 41, support seat; 42, deviation corrector; 5, first detection component; 51, first mounting seat; 52, first lighting lamp board; 53, first camera detector; 6, first retention component; 61, first retention table; 62, first guide roller; 63, control switch; 64, first auxiliary replacement component; 641, first ruler; 642, first utility knife; 6 43. first cutting groove; 7. cutting assembly; 71. rotating shaft; 72. cutting knife; 73. driving motor; 8. second detection assembly; 81. second mounting seat; 82. second lighting lamp board; 83. second video detector; 9. second retention assembly; 91. second retention table; 92. second guide roller; 93. second auxiliary replacement assembly; 931. second ruler; 932. second utility knife; 933. second cutting groove; 10. winding roller; 20. label. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1 -Attached Fig.10 This application is described in further detail.

[0040] The embodiment of the present application discloses a label printing quality inspection device.

[0041] Reference Figure 1A label printing quality inspection device comprises a frame 1 placed horizontally on the ground, on which a clamping device 2, an unwinding roller 3, a deflection correction component 4, a first detection component 5, a first retention component 6, a cutting component 7, a second detection component 8, a second retention component 9 and a winding roller 10 are installed. When in use, the clamping device 2, the unwinding roller 3, the deflection correction component 4, the first detection component 5, the first retention component 6, the cutting component 7, the second detection component 8, the second retention component 9 and the winding roller 10 are used in coordination to detect the label 20 during the unwinding and conveying process of the label 20, and replace the unqualified label 20, so as to ensure the quality of the last rolled label 20.

[0042] Reference Figure 1 and Figure 2 The unwinding roller 3 is used to unwind the label 20, and the winding roller 10 is used to wind up the label 20 after inspection. The unwinding roller 3 is located at the left end of the frame 1, and the winding roller 10 is located at the right end of the frame 1. The unwinding roller 3 and the winding roller 10 are both rotatably connected to the frame 1, the unwinding roller 3 is located below the deviation correction component 4, and the winding roller 10 is located below the second retention component 9. The conveying direction of the label 20 is from the left to the right of the frame 1; when in use, the label 20 is unwound from the unwinding roller 3, and under the guidance of the clamping device 2, it passes through the deviation correction component 4, the first detection component 5, the first retention component 6, the cutting component 7, the second detection component 8 and the second retention component 9 in sequence, and finally is wound into a plurality of small rolls of the label 20 on the winding roller 10.

[0043] Reference Figure 2 and Figure 3 The clamping device 2 is used to squeeze and tighten the label 20 being transported. The clamping device 2 includes a plurality of clamping rollers 21, which are rotatably connected to the frame 1. The plurality of clamping rollers 21 are arranged at intervals along the conveying direction of the label 20, and the label 20 is wound around the outer wall of the clamping roller 21. When in use, the conveying direction of the label 20 is guided by the use of the clamping roller 21, thereby ensuring that the label 20 always remains in a tensioned state during the conveying process, avoiding wrinkles in the label 20 during the conveying process, thereby improving the accuracy of detection.

[0044] Reference Figure 2 and Figure 4 The deflection correction component 4 is used to correct the conveying direction of the label 20 to prevent the conveying deviation of the label 20 from affecting the subsequent quality inspection. The deflection correction component 4 includes a support seat 41 and a deflection corrector 42. The support seat 41 is fixedly connected to the left end of the frame 1, and the deflection corrector 42 is installed on the frame 1. When in use, the label 20 is conveyed to the deflection corrector 42 through the conveying roller of the deflection corrector 42, and then the conveying direction of the label 20 is corrected to ensure that the conveying process of the label 20 is in a centered state, and to ensure that the conveying of the label 20 will not be deflected and affect the subsequent inspection.

[0045] Reference Figure 2 and Figure 5 The first detection component 5 is used to perform quality inspection on the label 20 in transportation. The first detection component 5 is located on the right side of the correction component 4. The first detection component 5 includes a first mounting seat 51, a first lighting board 52 and a first camera detector 53. The first mounting seat 51 is fixedly connected to the frame 1, the first lighting board 52 is fixedly connected to the first mounting seat 51, and the first lighting board 52 is set toward the label 20. The first camera detector 53 is fixedly connected to the first mounting seat 51, and the detection head of the first camera detector 53 is set to face directly downward.

[0046] Reference Figure 2 and Figure 5 When in use, the staff will enter the qualified label 20 information into the first camera detector 53 as a sample in advance. When the transported label 20 passes through the detection head of the first camera detector 53, the light of the first lighting panel 52 is used to ensure that the pattern and other information on the label 20 are clearly visible to avoid being affected by the dim ambient light. After that, the transported label 20 is photographed by the first camera detector 53 and compared with the sample. When the comparison is consistent, the label 20 is qualified. When a difference is detected in the comparison, the label 20 is unqualified. At this time, the first camera detector 53 transmits a signal to the PLC device, and the PLC device receives and processes the signal, thereby controlling the entire device to suspend operation, so that subsequent staff can remove unqualified labels 20.

[0047] Reference Figure 2 and Figure 6 The first retention component 6 is used to retain the label 20, so that the staff can replace the unqualified label 20. The first retention component 6 includes a first retention table 61 and two first guide rollers 62. The first retention table 61 is fixedly connected to the frame 1, and the first retention table 61 is located on the right side of the first detection component 5. The two first guide rollers 62 are respectively located at the two ends of the first retention table 61, and the first guide roller 62 is rotatably connected to the first retention table 61; when in use, the label 20 is conveyed by the first guide roller 62, so that the label 20 slides on the first retention table 61. When the first detection component 5 detects an unqualified label 20, the PLC device controls the overall equipment to suspend the conveying, so that the unqualified label 20 stays on the first retention table 61, and the staff can remove the unqualified products on the first retention table 61 and replace them with qualified products.

[0048] Reference Figure 6 and Figure 7In order to ensure the accuracy of the staff when replacing the unqualified label 20 with the qualified label 20, a first auxiliary replacement component 64 is arranged on the first retention table 61. The first auxiliary replacement component 64 includes a first ruler 641 sliding on the first retention table 61, a first utility knife 642 arranged on the first retention table 61, and a first cutting groove 643 is also opened on the surface of the first retention table 61; when in use, the first utility knife 642 is arranged to facilitate the staff to remove the unqualified label 20, and the first ruler 641 is adjusted to the edge of the unqualified label 20, so that the staff can stick the qualified label 20 in the correct direction, avoiding affecting the subsequent cutting component 7 to cut the label 20, which is more convenient to use.

[0049] Reference Figure 6 A control switch 63 is installed on the first retention table 61. The control switch 63 is used to control the start of the entire equipment or adjust the operating speed of the equipment. When it is necessary to stop the operation of the entire equipment or adjust the operating speed of the equipment, the staff can manually adjust it through the control switch 63, which is more convenient to use.

[0050] Reference Figure 2 and Figure 8 The cutting assembly 7 is used to cut a complete label 20 paper into several long strips of labels 20. The cutting assembly 7 is located on the right side of the first retention table 61. The cutting assembly 7 includes a rotating shaft 71, a cutter 72 and a driving motor 73. The rotating shaft 71 is rotatably connected to the frame 1, and the cutter 72 is coaxially fixedly connected to the rotating shaft 71. There are several cutters 72, and the several cutters 72 are evenly spaced along the axial direction of the rotating shaft 71. In this embodiment, the cutters 72 are preferably set to 5. The driving motor 73 is installed on the frame 1, and the main shaft of the driving motor 73 is coaxially fixedly connected to the rotating shaft 71; when in use, the driving motor 73 drives the rotating shaft 71 to rotate, and the rotating shaft 71 rotates to drive the cutter 72 to cut the entire label 20 paper, so as to evenly cut the entire label 20 into several long strips of label 20 paper, thereby facilitating subsequent packaging and being simple and convenient to use.

[0051] Reference Figure 2 and Fig. 9The second detection component 8 is used to detect the cut label 20. The second detection component 8 is located on the right side of the cutting component 7. The second detection component 8 includes a second mounting seat 81, a second lighting board 82 and a second camera detector 83. The second mounting seat 81 is fixedly connected to the frame 1, and the second lighting board 82 is fixedly connected to the second mounting seat 81, and the second lighting board 82 is set toward the label 20. The second camera detector 83 is fixedly connected to the second mounting seat 81, and the detection head of the second camera detector 83 is set to face directly downward; when in use, the cut label 20 is subjected to a secondary inspection by the second camera detector 83. On the one hand, it is avoided that the unqualified label 20 detected by the first detection component 5 is not replaced by the qualified label 20 in time by the worker, thereby ensuring the quality of the final packaged label 20; on the other hand, it is ensured that the label 20 cut by the cutting component 7 has no quality problems such as missing.

[0052] Reference Figure 2 and Fig.10 The second retention component 9 is used to retain the cut labels 20, so as to facilitate the staff to replace the labels 20 that fail the second inspection. The second retention component 9 includes a second retention table 91 and two second guide rollers 92. The second retention table 91 is fixedly connected to the frame 1. The second retention table 91 is located on the right side of the second detection component 8. The two second guide rollers 92 are respectively located at both ends of the second retention table 91, and the second guide rollers 92 are rotatably connected to the second retention table 91; when in use, the label 20 is conveyed by the second guide roller 92, so that the label 20 slides on the second retention table 91. When the second detection component 8 detects an unqualified label 20, the PLC device controls the overall equipment to suspend the conveying, so that the unqualified label 20 stays on the second retention table 91, and the staff can remove the unqualified products on the second retention table 91 and replace them with qualified products.

[0053] Reference Fig.10 A second auxiliary replacement component 93 is provided on the second retention table 91. The second auxiliary replacement component 93 includes a second ruler 931 sliding on the second retention table 91, a second utility knife 932 provided on the second retention table 91, and a second cutting groove 933 is also provided on the surface of the second retention table 91. When in use, the second utility knife 932 is provided to facilitate the staff to remove unqualified labels 20, and the second ruler 931 is adjusted to the edge of the unqualified label 20 to facilitate the staff to stick the qualified label 20 in the correct direction, so as to avoid affecting the subsequent cutting component 7 to cut the label 20, which is more convenient to use.

[0054] The implementation principle of the embodiment of the present application is as follows: when in use, the staff puts the rolled label 20 on the unwinding roller 3, and through the joint action of the conveying roller, the first guide roller 62 and the second guide roller 92 of the corrector 42, the unrolled label 20 passes through the correcting component 4, the first detection component 5, the first retention component 6, the cutting component 7, the second detection component 8 and the second retention component 9, and finally completes the winding through the winding roller 10. During the conveying process of the label 20, the corrector 42 corrects the transportation direction of the label 20 to ensure that the label 20 is in the middle position, and performs a preliminary inspection on the label 20 through the first detection component 5. When an unqualified label 20 is detected, the first detection component 5 transmits a signal to the PLC device, and the PLC device receives and processes the signal. Thereafter, the PLC device controls the entire device to suspend operation, so that the unqualified label 20 is retained on the first retention table 61. After the staff manually removes the unqualified label 20 and replaces it with a qualified label 20, the work The personnel then controls the PLC device to restart the device, and transports the inspected label 20 to the cutting component 7, and cuts the entire label 20 into several long strips of labels 20 through the cutting component 7, and then continues to transport it to the second inspection component 8, and performs secondary inspection on the cut label 20 through the second inspection component 8. When an unqualified label 20 is detected, the second inspection component 8 transmits a signal to the PLC device, and the PLC device receives and processes the signal. Then the PLC device controls the device to suspend operation again, so that the unqualified label 20 is retained on the second retention table 91. After the staff manually removes the unqualified label 20 and replaces it with a qualified label 20, the PLC device can be controlled to continue to operate. Finally, the label 20 is wound into a plurality of small label 20 rolls through the winding roller 10. While ensuring the printing quality of the label 20, the entire group of label 20 rolls is divided into several small label 20 rolls, which facilitates subsequent packaging and improves work efficiency. It is simple and convenient to use.

[0055] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A label printing quality inspection device, characterized in that: The invention comprises a frame (1), on which a clamping device (2) for ensuring the tension of a label (20) during conveying is installed, and on which a reeling roller (3) for reeling a label (20) roll is arranged in sequence along the conveying direction, a deviation correction component (4) for ensuring that the label (20) is centered in the conveying direction, a first detection component (5) for detecting the quality of the label (20), a first retention component (6) for retaining unqualified labels (20), a cutting component (7) for cutting the label (20), a second detection component (8) for detecting the cut label (20), a second retention component (9) for retaining unqualified labels (20) after secondary detection, and a reeling roller (10) for reeling the label (20).

2. The label printing quality inspection device according to claim 1, characterized in that: The pressing device (2) comprises a pressing roller (21) mounted on the frame (1), a plurality of the pressing rollers (21) are provided, and the plurality of pressing rollers (21) are arranged at intervals along the conveying direction of the label (20).

3. The label printing quality inspection device according to claim 1, characterized in that: The deflection correction component (4) comprises a support base (41) fixedly connected to the frame (1) and a deflection corrector (42) mounted on the support base (41).

4. The label printing quality inspection device according to claim 1, characterized in that: The first detection component (5) comprises a first mounting seat (51) arranged on the frame (1), a first lighting panel (52) fixedly connected to the first mounting seat (51), and a first video detector (53) fixed to the first mounting seat (51); the first detection component (5) is located above the label (20), and a detection head of the first video detector (53) is arranged toward the label (20).

5. The label printing quality inspection device according to claim 1, characterized in that: The first retention component (6) comprises a first retention platform (61) fixed on the frame (1) and a first guide roller (62) rotating on the first retention platform (61); two first guide rollers (62) are provided, and the two first guide rollers (62) are respectively located at two ends of the first retention platform (61).

6. The label printing quality inspection device according to claim 5, characterized in that: The first retention platform (61) is provided with a control switch (63) for controlling the start-up of the entire device.

7. The label printing quality inspection device according to claim 1, characterized in that: The cutting assembly (7) comprises a rotating shaft (71) rotating on the frame (1), a cutter (72) fixed on the rotating shaft (71), and a driving motor (73) for driving the rotating shaft (71) to rotate. A plurality of the cutters (72) are provided, and the plurality of the cutters (72) are evenly spaced and arranged along the axis direction of the rotating shaft (71). The driving motor (73) is mounted on the frame (1), and a main shaft of the driving motor (73) is coaxially fixedly connected to the rotating shaft (71).

8. The label printing quality inspection device according to claim 1, characterized in that: The second detection component (8) comprises a second mounting seat (81) arranged on the frame (1), a second lighting lamp board (82) fixedly connected to the second mounting seat (81), and a second video detector (83) fixed to the second mounting seat (81); the second detection component (8) is located above the label (20), and the detection head of the second video detector (83) is arranged toward the label (20).

9. The label printing quality inspection device according to claim 1, characterized in that: The second retention assembly (9) comprises a second retention platform (91) fixed on the frame (1) and a second guide roller (92) rotating on the second retention platform (91); two second guide rollers (92) are provided, and the two second guide rollers (92) are respectively located at two ends of the second retention platform (91).

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