A packaging box punching and waste removing device

Abstract

The utility model discloses a kind of packing box punching waste removal devices, including workbench, workbench is fixedly installed on rack, the bottom of workbench is installed with rotary drive device, the output shaft of rotary drive device is stretched out workbench upwards, the bottom center of tray is fixedly installed on the output shaft of rotary drive device, the side of workbench is fixedly connected with longitudinal member, the upper side of longitudinal member is fixedly connected with horizontal plate, horizontal plate extends to the above tray, first telescopic device is installed on horizontal plate, the piston rod of first telescopic device is stretched out downwards and is installed with pressing plate, the downside of pressing plate is fixedly installed with several thimbles;The workbench is provided with discharge hole in the position corresponding to thimble, at least two corresponding holes are provided on tray, after tray rotating position, one of corresponding holes is located directly below thimble. The utility model is installed rotary drive device at the bottom of workbench, drives tray to rotate by rotary drive device, to reduce labor intensity.

Description

Technical Field

[0001] This utility model relates to the field of packaging box production equipment technology, and in particular to a packaging box punching and waste removal device. Background Technology

[0002] Most high-end gift packaging boxes on the market use magnets to attach the switch box. This type of packaging involves a significant number of handcrafted components. The components for attaching the magnets require cutting holes in high-strength grey board. However, after cutting the holes, scrap round pieces remain inside, necessitating their removal. See one example from an order. Figure 7 The high-strength gray board 1 has symmetrically arranged holes 2 at both ends. In small-batch production, the circular waste material inside the holes is manually cleaned out using a pin. However, in large-batch production, manual cleaning is inefficient and labor-intensive. To solve this problem, our technical personnel designed a packaging box punching and waste removal device as described in this application.

[0003] A search revealed Chinese patent document CN214983565U, published on December 3, 2021, which discloses a multi-hole one-time cleaning device for producing wine box outer packaging. The top of the frame is fixed with a top plate, and a worktable is fixed on the top of the top plate. A pressure cylinder mounting seat is fixed on one side of the top of the worktable. A power cylinder is fixed on the outer wall of the pressure cylinder mounting seat. A mold assembly is fixed to the end of the piston rod of the power cylinder. A first punch for perforation is symmetrically fixed on both sides of the bottom end of the mold assembly, and a second punch for perforation is fixed at the center of the bottom end of the mold assembly. The first punch cooperates with the first discharge hole set on the worktable, and the second punch cooperates with the second discharge hole set on the worktable. Its advantages are: by using pneumatic means to replace the traditional manual hole cleaning method, the hole cleaning efficiency is greatly improved and the labor intensity of the operators is reduced. Its disadvantages are: when using this device to clean holes, it is necessary to first clean the circular waste material in the hole 2 at one end of the high-strength gray board 1, then take out the high-strength gray board 1 and rotate it 180°, and then clean the circular waste material in the hole 2 at the other end of the high-strength gray board 1. This process requires manual rotation and pushing of multiple layers of high-strength gray board 1, bending over to operate, and the labor intensity is also relatively large. Utility Model Content

[0004] The technical problem to be solved by this utility model is to address the problems existing in the background art and provide a packaging box punching and waste removal device, which reduces labor intensity by installing a rotary drive device at the bottom of the workbench and driving the tray to rotate.

[0005] To achieve the above-mentioned technical features, the purpose of this utility model is as follows: A packaging box punching and waste removal device includes a workbench, which is fixedly installed on a frame. A rotary drive device is installed at the bottom of the workbench, and the output shaft of the rotary drive device extends upward from the workbench. The bottom center of the tray is fixedly installed on the output shaft of the rotary drive device. A longitudinal member is fixedly connected to one side of the workbench, and a transverse plate is fixedly connected to the upper side of the longitudinal member. The transverse plate extends to the top of the tray, and a first telescopic device is installed on the transverse plate. The piston rod of the first telescopic device extends downward and is fitted with a pressure plate. Several ejector pins are fixedly installed on the lower side of the pressure plate. The workbench is provided with slag discharge holes at the positions corresponding to the ejector pins, and at least two corresponding holes are provided on the tray. After the tray is rotated, one of the corresponding holes is located directly below the ejector pin.

[0006] The pallet includes a base plate, and the base plate is surrounded by side panels.

[0007] The two side panels on opposite sides each have a notch.

[0008] The workbench is equipped with multiple omnidirectional conveyor balls, and the pallet is movably supported on the omnidirectional conveyor balls.

[0009] At least one guide rod is fixedly installed on the pressure plate, and a guide sleeve is slidably fitted on the guide rod. The guide sleeve is installed on the horizontal plate.

[0010] A positioning device is also installed at the bottom of the workbench; the positioning device includes a guide hole seat, a second telescopic device, and a positioning pin. The guide hole seat is fixedly installed at the bottom of the workbench. The guide hole seat has a longitudinal guide hole that penetrates the workbench. The second telescopic device is installed at the bottom of the guide hole seat. A positioning pin is installed on the piston rod of the second telescopic device. The positioning pin is slidably installed in the guide hole. A positioning ring is fixedly installed at the bottom of the tray. When the positioning pin is inserted into the positioning hole in the positioning ring, the tray is positioned.

[0011] The rotary drive device uses a 90° or 180° rack and pinion oscillating cylinder.

[0012] The output shaft of the rotary drive device is a hollow shaft, and a support is installed inside the hollow shaft. The upper end of the support extends out of the worktable, and the tray is fixedly installed on the top of the support.

[0013] The lower end of the rotary drive device is equipped with a frame-shaped seat, and the lower end of the frame-shaped seat is equipped with a third telescopic device. The piston rod of the third telescopic device is equipped with a lifting component, which includes a lifting plate and a lifting rod fixed to the middle of one side of the lifting plate. The lifting rod is fixedly installed with the piston rod of the third telescopic device. The support component has an axial sliding hole in its center, and the sliding hole passes through the tray. A recessed platform is provided on the upper side of the tray. The lifting rod slides through the sliding hole. When the piston rod of the third telescopic device retracts, the lifting plate descends into the recessed platform. When the piston rod of the third telescopic device extends, the lifting plate rises to a certain height.

[0014] The support component includes a connecting plate and a support column. One end of the support column is fixed to the center of one side of the connecting plate. A sliding hole passes through the connecting plate and the support column. The connecting plate is provided with a mounting hole. The end of the support column near the connecting plate is provided with a step. The support column is provided with a keyway. The support column is inserted into the output shaft of the rotary drive device. The support column and the output shaft of the rotary drive device are positioned by a key connection. The connecting plate is fixedly installed and supported at the center of the bottom of the tray by screws.

[0015] The features of this utility model using the above-mentioned technical solution are: 1. The workbench of this utility model is used to install a rotary drive device, which rotates a support tray. The tray holds multiple layers of high-strength gray board. When the high-strength gray board is placed in the tray, the cut holes on the gray board align with the corresponding holes in the tray. By rotating the tray with the rotary drive device, when the cut hole is directly below the ejector pin, the piston rod of the first telescopic device extends, and the ejector pin moves downward, thus pushing the circular waste material in the cut hole downward. The circular waste material falls to the ground from the corresponding hole and the slag discharge hole. Afterward, the piston rod of the first telescopic device retracts, the ejector pin moves upward and resets, and then the rotary drive device rotates the tray, rotating the next cut hole directly below the ejector pin, and the ejector pin pushes the circular waste material in the cut hole downward again. This utility model reduces labor intensity by installing a rotary drive device at the bottom of the workbench and driving the tray to rotate.

[0016] 2. The bottom of the workbench of this utility model is also equipped with a positioning device, which is used to accurately position the tray.

[0017] 3. In this utility model, after the circular waste material in the hole of the high-strength gray board is cleaned up, when the piston rod of the third telescopic device extends, the lifting plate rises to a certain height, lifting the high-strength gray board for easy handling. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0019] Figure 1This is a schematic diagram of the main structure of this utility model.

[0020] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of AA.

[0021] Figure 3 for Figure 1 A schematic diagram of the cross-sectional structure of AA, in which the lifting component is in the lifting state.

[0022] Figure 4 for Figure 2 Enlarged structural diagram at point B.

[0023] Figure 5 This is a structural schematic diagram of the support component in this utility model.

[0024] Figure 6 This is a schematic diagram of the lifting component in this utility model.

[0025] Figure 7 This is a schematic diagram of cutting holes in a high-strength gray board.

[0026] Figure Labels High-strength gray board 1, with holes cut 2; Workbench 10, frame 11, universal conveyor ball 12, longitudinal component 13, transverse plate 14, slag discharge hole 15, positioning ring 16, positioning hole 161, guide cone hole 162. Rotary drive device 20, support member 21, connecting plate 211, mounting hole 212, support column 213, step 214, keyway 215, sliding hole 216, frame seat 22; Pallet 30, bottom plate 31, corresponding hole 311, countersunk platform 312, side panel 32, notch 33; First telescopic device 40, pressure plate 41, ejector pin 42, guide rod 43, guide sleeve 44. Third telescopic device 50, Lifting component 60, lifting plate 61, lifting rod 62. Positioning device 70, guide hole seat 71, guide hole 711, second telescopic device 72, positioning pin 73. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0029] Example 1: See Figure 1 , 2 A packaging box punching and waste removal device includes a workbench 10, which is fixedly mounted on a frame 11. A rotary drive device 20 is mounted on the bottom of the workbench 10, and the output shaft of the rotary drive device 20 extends upward from the workbench 10. The bottom center of a tray 30 is fixedly mounted on the output shaft of the rotary drive device 20. A longitudinal member 13 is fixedly connected to one side of the workbench 10, and a transverse plate 14 is fixedly connected to the upper side of the longitudinal member 13. The transverse plate 14 extends above the tray 30, and a first telescopic device 40 is mounted on the transverse plate 14. The piston rod of the first telescopic device 40 extends downward and is mounted on a pressure plate 41. Several ejector pins 42 are embedded and fixedly mounted on the lower side of the pressure plate 41. The workbench 10 is provided with slag discharge holes 15 at the positions corresponding to the ejector pins 42. The tray 30 is provided with at least two corresponding holes 311. After the tray 30 is rotated, one of the corresponding holes 311 is located directly below the ejector pins 42.

[0030] The workbench 10 is used to install the rotary drive device 20, which is used to rotate the support tray 30. The tray 30 holds multiple layers of high-strength gray board 1. When the high-strength gray board 1 is placed in the tray 30, the cut holes 2 on the high-strength gray board 1 correspond to the corresponding holes 311 in the tray 30. By rotating the tray 30 through the rotary drive device 20, when the cut hole 2 is directly below the ejector pin 4, the piston rod of the first telescopic device 40 extends, and the ejector pin 42 moves downward, thereby pushing the circular waste material in the cut hole 2 downward. The circular waste material falls to the ground from the corresponding hole 311 and the slag discharge hole 15. Afterward, the piston rod of the first telescopic device 40 retracts, the ejector pin 42 moves upward to reset, and then the rotary drive device 20 rotates the tray 30, rotating the next cut hole 2 directly below the ejector pin 4, and then the ejector pin 42 pushes the circular waste material in the cut hole 2 downward. This invention reduces labor intensity by installing a rotary drive device 20 at the bottom of the workbench 10, which drives the tray 30 to rotate.

[0031] If the pallet 30 can be round, then the corresponding high-strength gray board 1 can also be round.

[0032] See Figure 7In this embodiment, the high-strength gray board 1 is rectangular, and the two ends of the high-strength gray board 1 are symmetrically provided with cut holes 2. Then the tray 30 is rectangular, and the multi-layer high-strength gray board 1 is placed in the tray 30 for positioning.

[0033] The rotary drive device 20 can be a servo motor equipped with a reducer. When in use, the cut hole 2 at one end of the high-strength gray board 1 is aligned with the ejector pin 42 as a reference. When it is necessary to clean the cut hole 2 at the other end, the rotary drive device 20 drives the tray 30 to rotate 180°.

[0034] See Figure 2 The pallet 30 includes a base plate 31, and a surrounding plate 32 is welded around the base plate 31.

[0035] To facilitate the removal of the high-strength gray board 1 from the tray 30, notches 33 are provided on the opposite side panels 32.

[0036] Further, see Figure 1 , 2 The workbench 10 is equipped with multiple universal conveyor balls 12, and the pallet 30 is movably supported on the universal conveyor balls 12. The universal conveyor balls 12 provide movable support for the pallet 30, thereby improving the stability of the pallet 30 during operation.

[0037] See Figure 1 At least one guide rod 43 is fixedly installed on the pressure plate 41, and a guide sleeve 44 is slidably fitted on the guide rod 43. The guide sleeve 44 is installed on the transverse plate 14. By setting the guide rod 43, the pressure plate 41 is limited to prevent rotation. This is suitable for situations where multiple ejector pins 42 are embedded and installed on the lower side of the pressure plate 41. When only one ejector pin 42 is installed, the ejector pin 42 is coaxial with the piston rod of the first telescopic device 40, so the problem of rotation of the pressure plate 41 can be ignored.

[0038] In this embodiment, the first telescopic device 40 is a pneumatic cylinder or a hydraulic cylinder.

[0039] Example 2: The difference between this embodiment and embodiment 1 is that the rotary drive device 20 can also be a 90° or 180° rack and pinion swing cylinder. Compared with a servo motor, the swing cylinder control is simpler.

[0040] Combination Figure 7 The high-strength gray board 1 has symmetrically arranged cutting holes 2 at both ends. In this embodiment, a 180° gear and rack swing cylinder is selected. In use, the cutting hole 2 at one end of the high-strength gray board 1 is aligned with the ejector pin 42 as a reference. When it is necessary to clean the cutting hole 2 at the other end, the rotary drive device 20 drives the tray 30 to rotate 180°.

[0041] The 180° rack and pinion swing cylinder is existing technology and can be selected and purchased on the market as needed.

[0042] Example 3: Based on Embodiment 2, a positioning device 70 is also installed at the bottom of the workbench 10 to accurately position the tray 30.

[0043] Specifically, see Figure 2 , 4 The positioning device 70 includes a guide hole seat 71, a second telescopic device 72, and a positioning pin 73. The guide hole seat 71 is fixedly installed on the bottom of the worktable 10. The guide hole seat 71 has a longitudinal guide hole 711 that penetrates the worktable 10. The second telescopic device 72 is installed at the bottom of the guide hole seat 71. The positioning pin 73 is installed on the piston rod of the second telescopic device 72 and is slidably installed in the guide hole 711. A positioning ring 16 is fixedly installed at the bottom of the tray 30. When the positioning pin 73 is inserted into the positioning hole 161 in the positioning ring 16, the tray 30 is positioned. After cleaning, the piston rod of the second telescopic device 72 retracts and the positioning pin 73 is pulled out from the positioning ring 16.

[0044] Specifically, see Figure 4 The lower end of the positioning hole 161 of the positioning ring 16 is provided with a guide cone hole 162 so that the positioning pin 73 can still be inserted into the positioning hole 161 after the tray 30 is slightly offset.

[0045] Multiple positioning rings 16 are provided according to the positions of the holes 2 cut on the high-strength gray board 1. In this embodiment, see [reference needed]. Figure 2 There are two positioning rings 16. One positioning ring 16 is used to position the cut hole 2 at one end, and the other positioning ring 16 is used to position the cut hole 2 at the other end. The second telescopic device 72 is a pneumatic cylinder or a hydraulic cylinder.

[0046] Example 4: Based on Example 1, 2, or 3, see [link to example]. Figure 2 The output shaft of the rotary drive device 20 is a hollow shaft, and a support member 21 is installed inside the hollow shaft. The upper end of the support member 21 extends out of the worktable 10, and the tray 30 is fixedly installed on the top of the support member 21.

[0047] Specifically, see Figure 5The support member 21 includes a connecting plate 211 and a support column 213. One end of the support column 213 is fixed to the center of one side of the connecting plate 211. A sliding hole 216 passes through the connecting plate 211 and the support column 213. The connecting plate 211 is provided with a mounting hole 212. The end of the support column 213 near the connecting plate 211 is provided with a step 214. The support column 213 is provided with a keyway 215. The support column 213 is inserted into the output shaft of the rotary drive device 20. The support column 213 and the output shaft of the rotary drive device 20 are positioned by a key connection. The connecting plate 211 is fixedly mounted and supported at the center of the bottom of the tray 30 by screws.

[0048] Further, see Figure 2 , 6 A frame-shaped seat 22 is installed at the lower end of the rotary drive device 20. A third telescopic device 50 is installed at the lower end of the frame-shaped seat 22. A lifting member 60 is installed on the piston rod of the third telescopic device 50. The lifting member 60 includes a lifting plate 61 and a lifting rod 62 fixed to the middle of one side of the lifting plate 61. The lifting rod 62 is fixed to the piston rod of the third telescopic device 50. An axial sliding hole 216 is provided in the center of the support member 21, and the sliding hole 216 passes through the tray 30. A recessed platform 312 is provided on the upper side of the tray 30. The lifting rod 62 slides through the sliding hole 216. When the piston rod of the third telescopic device 50 retracts, the lifting plate 61 descends into the recessed platform 312. When the piston rod of the third telescopic device 50 extends, the lifting plate 61 rises to a certain height.

[0049] See Figure 2 When the high-strength gray board 1 is placed into the tray 30, the piston rod of the third telescopic device 50 retracts, and the lifting plate 61 descends into the sinking platform 312.

[0050] See Figure 3 When the circular waste material in the cut hole 2 on the high-strength gray board 1 is cleaned up, when the piston rod of the third telescopic device 50 extends, the lifting plate 61 rises a certain height, lifting the high-strength gray board 1 for easy removal.

[0051] The third telescopic device 50 is a pneumatic cylinder or a hydraulic cylinder.

[0052] The working principle or process of the utility model: When using, please refer to Figure 2 The piston rod of the third telescopic device 50 retracts, and the lifting plate 61 descends into the sinking platform 312, placing the high-strength gray board 1 into the tray 30. At this time, the cut hole 2 at one end of the high-strength gray board 1 is aligned with the ejector pin 42. The piston rod of the first telescopic device 40 extends, and the ejector pin 42 moves downward, thereby pushing the circular waste material in the cut hole 2 downward. The circular waste material falls to the ground from the corresponding hole 311 and the slag discharge hole 15. Afterward, the piston rod of the first telescopic device 40 retracts, and the ejector pin 42 moves upward to reset.

[0053] Then, the rotary drive device 20 rotates the tray 30 180°, and then the ejector pin 42 pushes the circular waste material in the cutting hole 2 downward.

[0054] When using a rack and pinion oscillating cylinder, to prevent the tray 30 from shaking, when cleaning the circular waste material in the cut hole 2, the piston rod of the second telescopic device 72 extends and inserts the positioning pin 73 into the positioning hole 161 in the positioning ring 16 to position the tray 30. After cleaning is completed, the piston rod of the second telescopic device 72 retracts, and the positioning pin 73 is pulled out from the positioning ring 16.

[0055] See Figure 3 When the circular waste material in the cut hole 2 on the high-strength gray board 1 is cleaned up, when the piston rod of the third telescopic device 50 extends, the lifting plate 61 rises a certain height, lifting the high-strength gray board 1 for easy removal.

[0056] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Any modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A packaging box punching and waste removal device, characterized in that: The worktable (10) is fixedly mounted on the frame (11). A rotary drive device (20) is mounted on the bottom of the worktable (10). The output shaft of the rotary drive device (20) extends upward from the worktable (10). The bottom center of the tray (30) is fixedly mounted on the output shaft of the rotary drive device (20). A longitudinal member (13) is fixedly connected to one side of the worktable (10). A transverse plate (14) is fixedly connected to the upper side of the longitudinal member (13). The transverse plate (14) extends to the tray (30). Above, a first telescopic device (40) is installed on the horizontal plate (14). The piston rod of the first telescopic device (40) extends downward and is fitted with a pressure plate (41). Several ejector pins (42) are fixedly installed on the lower side of the pressure plate (41). The workbench (10) is provided with a slag discharge hole (15) at the position corresponding to the ejector pin (42). At least two corresponding holes (311) are provided on the tray (30). After the tray (30) is rotated, one of the corresponding holes (311) is located directly below the ejector pin (42).

2. The packaging box punching and waste removal device according to claim 1, characterized in that: The pallet (30) includes a bottom plate (31) and a surrounding plate (32) is provided around the bottom plate (31).

3. The packaging box punching and waste removal device according to claim 2, characterized in that: The two side panels (32) are respectively provided with notches (33).

4. The packaging box punching and waste removal device according to claim 1, characterized in that: The workbench (10) is equipped with multiple universal conveyor balls (12), and the tray (30) is movably supported on the universal conveyor balls (12).

5. The packaging box punching and waste removal device according to claim 1, characterized in that: At least one guide rod (43) is fixedly installed on the pressure plate (41), and a guide sleeve (44) is slidably fitted on the guide rod (43). The guide sleeve (44) is installed on the transverse plate (14).

6. The packaging box punching and waste removal device according to claim 1, characterized in that: The bottom of the workbench (10) is also equipped with a positioning device (70); the positioning device (70) includes a guide hole seat (71), a second telescopic device (72) and a positioning pin (73). The guide hole seat (71) is fixedly installed on the bottom of the workbench (10). The guide hole seat (71) has a longitudinal guide hole (711) and the guide hole (711) passes through the workbench (10). The bottom of the guide hole seat (71) is equipped with a second telescopic device (72). The piston rod of the second telescopic device (72) is equipped with a positioning pin (73). The positioning pin (73) is slidably installed in the guide hole (711). The bottom of the tray (30) is fixedly equipped with a positioning ring (16). When the positioning pin (73) is inserted into the positioning hole (161) in the positioning ring (16), the tray (30) is positioned.

7. The packaging box punching and waste removal device according to claim 1, characterized in that: The rotary drive device (20) adopts a 90° or 180° rack and pinion swing cylinder.

8. A packaging box punching and waste removal device according to claim 1 or 7, characterized in that: The output shaft of the rotary drive device (20) is a hollow shaft, and a support member (21) is installed inside the hollow shaft. The upper end of the support member (21) extends out of the worktable (10), and the tray (30) is fixedly installed on the top of the support member (21).

9. A packaging box punching and waste removal device according to claim 8, characterized in that: The lower end of the rotary drive device (20) is equipped with a frame-shaped seat (22), and the lower end of the frame-shaped seat (22) is equipped with a third telescopic device (50). The piston rod of the third telescopic device (50) is equipped with a lifting member (60). The lifting member (60) includes a lifting plate (61) and a lifting rod (62) fixed in the middle of one side of the lifting plate (61). The lifting rod (62) is fixed to the piston rod of the third telescopic device (50). The support member (21) is provided with an axial sliding hole (216) in the center, and the sliding hole (216) passes through the tray (30). A sinking platform (312) is provided on the upper side of the tray (30). The lifting rod (62) slides through the sliding hole (216). When the piston rod of the third telescopic device (50) retracts, the lifting plate (61) descends into the sinking platform (312). When the piston rod of the third telescopic device (50) extends, the lifting plate (61) rises to a certain height.

10. A packaging box punching and waste removal device according to claim 9, characterized in that: The support member (21) includes a connecting plate (211) and a support column (213). One end of the support column (213) is fixed to the center of one side of the connecting plate (211). A sliding hole (216) passes through the connecting plate (211) and the support column (213). The connecting plate (211) is provided with a mounting hole (212). The end of the support column (213) near the connecting plate (211) is provided with a step (214). The support column (213) is provided with a keyway (215). The support column (213) is inserted into the output shaft of the rotary drive device (20). The support column (213) and the output shaft of the rotary drive device (20) are positioned by a key connection. The connecting plate (211) is fixedly installed and supported at the center of the bottom of the tray (30) by screws.

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