Tilting tray sorting machine, tilting tray sorting system and sorting method thereof

Abstract

The invention discloses a tray turning and sorting machine, a tray turning and sorting system and a sorting method.The tray turning and sorting machine comprises a tray turning and sorting trolley and an overturning driving assembly for driving a tray assembly of the tray turning and sorting trolley to overturn relative to a tray support; the tray bracket is arranged on a frame of the tray dumping and sorting trolley in a manner of rotating around an axis extending along the vertical direction; and the tray bracket is connected with a driving part and a resetting part, wherein the driving part is used for being matched with an autorotation driving mechanism outside the tray overturning and sorting trolley to drive the tray bracket to autorotate relative to the frame, and the resetting part is used for resetting the tray bracket after autorotation. The discharging direction of the tray overturning assembly can be adjusted, driving force generated by a sorting loop line on goods in the running direction can be overcome to a certain extent by adjusting the discharging direction, accurate sorting of the goods in a smaller grid opening size is facilitated, and meanwhile the speed of the loop line is increased so as to improve the sorting efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of sorting, in particular to a tray-turning sorting machine, a tray-turning sorting system and a sorting method thereof. Background Art

[0002] The tray sorting machine is a commonly used sorting equipment.

[0003] The patent document with application publication number CN118618814A discloses a usable tilting tray sorting machine structure.

[0004] However, during the sorting process, the sorting loop formed by the tilting tray sorting trolley will apply horizontal driving force to the goods during operation, resulting in the need for larger grid openings for sorting the goods. In order to meet the requirements of the predetermined grid openings, the size of the tilting tray sorting machine needs to be enlarged, which limits the use scenarios of the tilting tray sorting machine and is not conducive to increasing the speed of the sorting loop. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems existing in the prior art and to provide a tray tilting sorting machine, a tray tilting sorting system and a sorting method thereof.

[0006] The purpose of the present invention is achieved through the following technical solutions: The tilting tray sorting machine comprises a tilting tray sorting trolley and a tilting driving assembly for driving the tray assembly of the tilting tray sorting trolley to tilt relative to a tray support, the tray support is arranged on the frame of the tilting tray sorting trolley to rotate around an axis extending in a vertical direction, the tray support is connected to a driving member for cooperating with a rotation driving mechanism outside the tilting tray sorting trolley to drive the tray support to rotate relative to the frame, and a reset member for returning the tray support to the center after rotation.

[0007] Preferably, in the tilting tray sorting trolley, the tray support is provided with a support plate, and the tray assembly is provided with a buffer which cooperates with the support plate to provide buffering when the tray assembly is flipped and tilted.

[0008] Preferably, in the tilting tray sorting trolley, the number of the reset members is two and they are distributed at both ends of the tray support in a mirror-symmetrical manner.

[0009] Preferably, in the tilting tray sorting trolley, the driving member is a roller arranged on at least one side of the tray support and the axis of which extends in the vertical direction.

[0010] Preferably, in the tiltable sorting trolley, the self-rotation drive mechanism includes a blocking arm and a mobile driver for driving the blocking arm to translate between a first position and a second position or to rotate between a third position and a second position around a rotating shaft extending in a vertical direction, the blocking arm includes a first side surface and a second side surface connected downstream of the first side surface and maintaining an obtuse angle with the first side surface; when the blocking arm is in the first position and the third position, the blocking arm does not contact the driving member on the corresponding side of the tiltable sorting trolley passing through the blocking arm; when the blocking arm is in the second position, the first side surface cooperates with the driving member on the corresponding side of the tiltable sorting trolley moving toward the first side surface to make the tray bracket rotate at a predetermined angle relative to the frame, and the second side surface cooperates with the driving member to keep the tray bracket at the predetermined angle relative to the frame.

[0011] Preferably, in the tipping tray sorting trolley, the blocking arm can be connected to the rotating shaft rotatably around the rotating shaft, and a waist-shaped hole is provided on the blocking arm, and the extension direction of the waist-shaped hole is consistent with the length direction of the first side surface. The telescopic shaft of the mobile driver is connected to the blocking arm through a pin shaft which is penetrated through the waist-shaped hole and can move along the waist-shaped hole. In the second position, the telescopic shaft is perpendicular to the second side surface, and in the third position, the telescopic shaft is perpendicular to the first side surface.

[0012] Preferably, in the tilting tray sorting trolley, the driving member cooperates with the self-rotation driving mechanism to enable the tray bracket to rotate 10-30° relative to the frame.

[0013] Preferably, in the tilt-tray sorting trolley, a self-rotation drive mechanism adjacent to each flip drive assembly is arranged downstream thereof, and the self-rotation drive mechanism and the flip drive assembly are distributed on opposite sides of the tilt-tray sorting trolley.

[0014] The tilt tray sorting system comprises any of the tilt tray sorting machines described above.

[0015] The sorting method of the tilt tray sorting system realizes the sorting of the goods by the cooperation of the flipping and tilting of the tray assembly of the tilt tray sorting trolley and the rotation of the tray bracket when the goods on the tilt tray sorting trolley need to be sorted.

[0016] The advantages of the technical solution of the present invention are mainly reflected in: In the tip-over sorting machine of the present invention, the tray support of the tip-over sorting trolley can be rotated relative to the frame along the axis in the vertical direction, so that the discharge direction of the tip-over assembly can be adjusted. By adjusting the discharge direction, the driving force of the sorting loop line on the running direction of the goods can be overcome to a certain extent, which is conducive to accurate sorting of goods in smaller grid sizes, and is also conducive to increasing the loop line speed to improve the sorting efficiency.

[0017] The coordinated structure of the driving member and the self-rotation driving mechanism of the present invention can effectively realize the self-rotation of the tray bracket during sorting without the need to power the tilt tray sorting trolley. It is easier to realize and can be simply modified on the basis of the existing tilt tray sorting trolley, which is convenient for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a partial top view of the tilt tray sorting machine of the present invention, in which only part of the tilt tray sorting trolley is shown; Figure 2 It is a three-dimensional diagram of the tilting tray sorting trolley of the present invention; Figure 3 This is a front view of the tilting tray sorting trolley of the present invention; Figure 4 It is a schematic diagram of the tray of the tilting tray sorting trolley of the present invention after the tray is tilted and the tray support rotates; Figure 5 is a three-dimensional diagram of the rotary drive assembly of the present invention and the self-rotation drive mechanism arranged therewith; Figure 6 It is a top view of the blocking arm of the self-rotation driving mechanism of the present invention in the third position and the rotation driving assembly installed together with the self-rotation driving mechanism; Figure 7 is a top view of the blocking arm of the self-rotation drive mechanism of the present invention in the second position and the rotation drive assembly installed together with the self-rotation drive mechanism; Figure 8 It is a partial top view of the tilting tray sorting system of the present invention; Fig. 9 yes Figure 8 A magnified view of the area in ; Fig.10 yes Fig. 9 The corresponding partially enlarged view of the flip tray sorting trolley hides the tray, the flip driving assembly that drives the tray assembly of the flip tray sorting trolley to flip, and the rotation driving mechanism that drives the tray bracket to rotate. DETAILED DESCRIPTION

[0019] The purpose, advantages and features of the present invention will be illustrated and explained by the non-limiting description of the following preferred embodiments. These embodiments are only typical examples of the application of the technical solution of the present invention, and any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of protection claimed by the present invention.

[0020] In the description of the scheme, it should be noted that the terms "center", "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience and simplification of 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0021] Example 1 The tilting tray sorting machine disclosed by the present invention is described below in conjunction with the accompanying drawings. Figure 1 As shown, like the patent literature cited in the background technology, the tilting tray sorting machine includes a circle of tilting tray sorting trolleys 200 connected in sequence and rollingly arranged on a track 100 and a tilting drive assembly 300 that drives the tray assembly 210 of the tilting tray sorting trolley 200 to tilt relative to the tray support 220.

[0022] The main structures of the tilting tray sorting trolley 200 and the turning drive assembly 300 can refer to the structures disclosed in the cited patent documents. The creative improvements of the present invention based on the tilting tray sorting trolley 200 are: As attached Figure 2 -Attached Figure 5 As shown, the tray support 220 is arranged on the frame 230 of the tilting tray sorting trolley 200 so as to rotate around an axis extending in the vertical direction. At the same time, a driving member 240 and a reset member 250 are arranged on the tray support 220. A rotation driving mechanism 400 cooperating with each of the flip driving assemblies 300 is arranged on the track 100. The rotation driving mechanism 400 at each position cooperates with the driving member 240 on the tilting tray sorting trolley 200 moving past it to drive the tray support 220 to rotate relative to the frame 230. The reset member 250 is used to return the tray support 220 to the center after rotation. Returning to the center here means that the tray support 220 rotates so that the front end of the support shaft 223 extending horizontally thereon is restored to a state facing the moving direction F of the tilting tray sorting trolley 200.

[0023] Specifically, as shown in the attached Figure 2As shown, the tray support 220 includes a bottom plate 221, and the bottom plate 221 is rotatably arranged on the frame 230 through a bearing 260. In order to make the structure of the tipping tray sorting trolley 200 more compact, the bearing 260 can be a slewing bearing or a cross roller bearing and is located in the middle position of the top of the frame 230. Two parallel vertical plates 222 are arranged on the bottom plate 221, and the tops of the two vertical plates 222 can be flipped left and right relative to them. The tray assembly 210 is switched between three states through the state locking assembly 270 at its bottom and the support shaft 223 arranged between the two vertical plates 222. The three states are the tray straightening state, the tray left tilting state and the tray right tilting state, wherein the tray straightening state, that is, the tray 211 is horizontal so that the axes of the flip driving wheels 280 on both sides of the tray assembly 210 extend horizontally; the tray left tilting state, that is, the tray is tilted to the lower left to achieve sorting; the tray right tilting state, that is, the tray is tilted to the lower right to achieve sorting. Of course, in other embodiments, the tray may be tilted to only one side for sorting, where left and right are relative to the moving direction F.

[0024] As attached Figure 3 , Attachment Figure 4 As shown, in order to reduce the violent vibration of the tray when the tray assembly 210 switches states, a support plate 290 is provided on the tray support 220, and a buffer 201 is provided on the tray assembly 210 to cooperate with the support plate 290 to provide buffering when the tray assembly 210 flips and tilts. The support plate 290 is provided on the inner side of one of the vertical plates 222 of the tray support 220 located downstream, and is trapezoidal in shape. There are two buffers 201 and they are provided on the bottom frame of the tray assembly 210, and each buffer 201 corresponds to an inclined surface position of the support plate 290.

[0025] As attached Figure 2 As shown, a support frame 224 is provided between the two vertical plates 222, and at least one driving member 240 is provided on the support frame 224. Preferably, the driving members 240 are two and symmetrically distributed on both sides of the tray support 220. The driving member 240 is a second side surface whose axis extends in the vertical direction, with the first end of the second side surface being located upstream of the second end thereof, and the first end of the second side surface being located upstream of the second end thereof and protruding to the outside of the tray support 220. Of course, in other embodiments, a spherical body that can roll or cannot roll may be used instead of the roller.

[0026] As attached Figure 2As shown, the reset member 250 can be at least one, and preferably there are two reset members 250 and they are distributed in a mirror-symmetrical manner at both ends of the tray bracket 220. The reset member 250 is preferably a tension spring, one end of which is connected to the connecting plate 231 on the frame 230, and the other end of which is connected to the bending plate 225 on the bottom plate 221 of the tray bracket 220. At the same time, under normal conditions, that is, when the driving member 240 is not subjected to other forces, the axes of the two tension springs extend horizontally and are perpendicular or approximately perpendicular to the axis of the support shaft 223, so that the two springs keep the front end of the support shaft 223 facing forward. Of course, in other embodiments, the spring can also be replaced by a leaf spring or a torsion spring.

[0027] As attached Figure 5 As shown, the self-rotation driving mechanism 400 includes a blocking arm 410 and a moving driver 420 for driving the blocking arm to translate between a first position and a second position or to rotate between a third position and a second position around a rotating shaft 430 extending in a vertical direction.

[0028] As attached Figure 6 As shown, the blocking arm 410 includes a first side surface 411 and a second side surface 412 connected to the downstream of the first side surface 411, and the first end of the first side surface is located upstream of the second end thereof; when the blocking arm 410 is in the first position and the third position, it will not contact the driving member 240 on the corresponding side of the tilting tray sorting trolley passing by it; when the blocking arm 410 is in the second position, as shown in the attached Figure 7 As shown, the first side surface 411 cooperates with the driving member 240 on the corresponding side of the tipping sorting cart 200 moving toward the first side surface 411 to make the tray support 220 rotate at a predetermined angle relative to the frame 230, and the second side surface 412 cooperates with the driving member 240 to make the tray support 220 maintain the predetermined angle relative to the frame 230.

[0029] The first side surface 411 and the second side surface 412 are the outer side surfaces of a vertically bent plate facing the tilt tray sorting trolley 200, the angle between the first side surface 411 and the second side surface 412 is an obtuse angle, and the first side surface 411 extends toward the side of the vertically bent plate close to the mobile driver 420. When the blocking arm 410 switches its position by translation, the second end is closer to the tilt tray sorting trolley 200 passing through it than the first end, and the second side surface 412 is perpendicular to the axis of the telescopic shaft 421 of the mobile driver 420. In the first position, the first side surface and the second side surface are located outside the moving path of the driving member on the corresponding side of the tilt tray sorting trolley, and in the second position, a part of the first side surface 411 and the second side surface 412 are located on the moving path of the driving member on the corresponding side of the tilt tray sorting trolley, as shown in the attached figure. Figure 6When the blocking arm 410 is switched in position by horizontal rotation, in the third position, the first side surface 411 is perpendicular to the axis of the telescopic shaft 421 of the mobile driver 420, as shown in the attached Figure 7 shown.

[0030] When the mobile driver 420 drives the blocking arm 410 to move linearly to switch between the first position and the second position, the mobile driver 420 can drive the blocking arm 410 to translate along an extension direction perpendicular to the track 100 at the blocking arm 410. At this time, the blocking arm 410 can be directly set on the telescopic shaft 421 of the mobile driver 420. More preferably, the blocking arm 410 can be set on the top of the track 100 through a guide rail assembly. At this time, the mobile driver 420 can be a feasible device such as a hydraulic cylinder, a pneumatic cylinder or an electric cylinder, an electric push rod, an electromagnet, etc.

[0031] More preferably, in order to reduce the size of the rotation drive mechanism 400, as shown in the attached Figure 5 -Attached Figure 7 As shown, the blocking arm 410 realizes position switching by horizontal rotation. Correspondingly, the blocking arm 410 also includes a horizontal plate 413 connected to the inner side of the vertical bending plate. The horizontal plate 413 is connected to the rotating shaft 430. The rotating shaft can be fixedly connected to the horizontal plate, and the rotating shaft 430 can be connected to the track by a bearing or a bearing sleeve. Of course, the rotating shaft can also be fixed and cannot rotate, so that the horizontal plate can rotate relative to the rotating shaft. A pivoting portion 414 is also provided on the inner side of the vertical bending plate. The pivoting portion 414 is connected to the telescopic shaft 421 of the mobile driver 420. The telescopic shaft 421 of the mobile driver 420 also extends horizontally and is perpendicular to the extension direction of the track 100 where the mobile driver 420 is located. Correspondingly, in order to facilitate driving, a waist-shaped hole 415 is formed on the pivot part 414, and the extension direction of the waist-shaped hole 415 is consistent with the length direction of the first side surface 411. The end of the telescopic shaft 421 is connected to a pin shaft 440 that passes through the waist-shaped hole 415 and can move relative to the waist-shaped hole 415. The pin shaft 440 is located upstream of the rotating shaft 430, so that when the telescopic shaft 421 is extended and retracted, the blocking arm 410 can be driven to rotate around the rotating shaft 430.

[0032] At the same time, the driving member 240 cooperates with the self-rotation driving mechanism 400 to make the tray support 220 rotate relative to the frame 230 by 10-30°, preferably between 15-30°.

[0033] In order to be able to cooperate with each flip drive assembly 300 for sorting, a self-rotation drive mechanism 400 is arranged adjacent to the downstream of each flip drive assembly 300, and the self-rotation drive mechanism 400 and the flip drive assembly 300 are distributed on opposite sides of the tip-tray sorting trolley 200, that is, the self-rotation drive mechanism and the flip drive assembly of a tip-tray sorting trolley are distributed on the left and right sides of the tip-tray sorting trolley. When the tip-tray sorting trolley 200 is to be sorted, the driving ramp 310 of the flip drive assembly 300 is switched to the straightening state, and at the same time or before or after, the blocking arm 410 of the self-rotation drive mechanism 400 matched with the flip drive assembly 300 is switched to the second position or the fourth position, so that when the flip drive wheel 280 of the tip-tray sorting trolley 200 moves through the driving ramp 310, the tip-tray assembly is driven to tilt for sorting, and when the tip-tray sorting trolley 200 continues to move toward the self-rotation drive mechanism 400, the driving member 240 on the tip-tray sorting trolley 200 is blocked by the blocking arm 410, thereby driving the tray support 220 to rotate, and when the driving member moves through the blocking arm, the driving member is no longer restricted, so that the reset member causes the tray support to rotate in the opposite direction and return to the normal position.

[0034] In order to achieve double-sided sorting, the track is provided with a flip drive assembly and a self-rotation drive mechanism located on both sides of the flip tray sorting trolley, and the flip drive assembly and the self-rotation drive mechanism located on the same side of the flip tray sorting trolley and matching the two sorting grids directly opposite to each other are arranged on the same mounting plate.

[0035] The tilting tray sorting machine also includes a straightening component arranged on the track for restoring the tilted tilting tray to a straightened state. The specific structure thereof is referred to the cited patent literature and will not be described in detail here.

[0036] Example 2 This embodiment discloses a tray sorting system, as shown in the attached Figure 8 As shown, it includes any of the above-mentioned tilting tray sorting machines, attached Figure 8 The figure shows the tilting tray sorting trolleys in different states. For the convenience of distinction, the tilting tray sorting trolley that sorts to the right and the tray support rotates clockwise is defined as the first tilting tray sorting trolley 20A, the tilting tray sorting trolley that tilts to the left and the tray support rotates counterclockwise is defined as the second tilting tray sorting trolley 20B, and the tilting tray sorting trolley that keeps the tray in a straightened state and the tray support remains normal and does not rotate is defined as the third tilting tray sorting trolley 20C. The tilting tray sorting trolley that only the tray assembly is tilted and the tray support remains normal and does not rotate is defined as the fourth tilting tray sorting trolley 20D.

[0037] As with citing patent documents, Figure 8As shown, the tray-turning sorting system further includes a bag supply area 500 and a grid area 600 arranged next to the tray-turning sorting machine, and a top code scanning device 700 and / or a side code scanning device arranged downstream of the bag supply area and upstream of the grid area. A flip drive assembly 300 and a self-rotation drive mechanism 400 are arranged at each sorting grid 610 of the grid area 600, and each of the flip drive assemblies 300 is biased toward the mid-downstream position of the entrance of the sorting grid 610. The flip drive assembly 300 arranged for each sorting grid 610 and the sorting grid 610 are distributed on both sides of the track 100, and the self-rotation drive mechanism 400 arranged for each sorting grid 610 and the sorting grid 610 are on the same side of the track 100.

[0038] Therefore, the above-mentioned flip tray sorting system includes the following process when sorting: when it is necessary to sort the goods on a flip tray sorting trolley 200, the sorting of the goods is achieved by the flipping and tilting of the tray assembly 210 of the flip tray sorting trolley 200 and the rotation of the tray bracket 220.

[0039] For example, as shown in the attached Fig. 9 , Attachment Fig.10 As shown, when a tiltable sorting trolley 200 is to be tilted to the right for sorting, the flipping drive assembly 300 corresponding to the sorting opening 610 to be sorted by the tiltable sorting trolley 200 is located on the left side of the tiltable sorting trolley 200, and the self-rotation drive mechanism 400 corresponding to the sorting opening 610 is located on the right side of the tiltable sorting trolley 200. Thus, when the tip-over sorting trolley 200 moves to the vicinity of the upstream of the flip drive assembly 300 on the left, the flip drive assembly 300 on the left drives the ramp 310 to switch to the straightening state to drive the flip drive wheel 280 on the left side of the tip-over sorting trolley 200 to lift, thereby realizing the flipping of the tip-over assembly. At the same time, or later, or slightly before the flip drive assembly 300 on the left switches its state, the automatic drive mechanism on the right switches to the second position. Thus, when the tip-over sorting trolley 200 moves past the automatic drive mechanism on the right, the drive member 240 on the right side of the tip-over sorting trolley 200 is blocked by the blocking arm, thereby causing the tray support 220 to rotate clockwise by a predetermined angle so that the lower side of the inclined tray is further biased toward the sorting grid 610 where the goods are to be sorted.

[0040] There are many implementation methods of the present invention, and all technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A tray tilting sorting machine, comprising a tray tilting sorting trolley and a tilting driving assembly for driving a tray assembly of the tray tilting sorting trolley to tilt relative to a tray support, characterized in that: The tray bracket is rotatably arranged on the frame of the tiltable sorting trolley around an axis extending in the vertical direction. The tray bracket is connected to a driving member for cooperating with a rotation driving mechanism outside the tiltable sorting trolley to drive the tray bracket to rotate relative to the frame and a reset member for returning the tray bracket to an upright position after rotation.

2. The tilting tray sorting trolley according to claim 1 is characterized in that: The tray support is provided with a support plate, and the tray assembly is provided with a buffer which cooperates with the support plate to provide buffering when the tray assembly is turned over and tilted.

3. The tilting tray sorting trolley according to claim 1 is characterized in that: There are two reset members which are distributed at two ends of the tray support in a mirror-symmetrical manner.

4. The tilting tray sorting trolley according to claim 1 is characterized in that: The driving member is a roller arranged on at least one side of the tray support and the axis of the roller extends in a vertical direction.

5. The tilting tray sorting trolley according to claim 4 is characterized in that: The self-rotation drive mechanism includes a blocking arm and a moving driver driving the blocking arm to translate between a first position and a second position or to rotate between a third position and a second position around a rotating shaft extending in a vertical direction, the blocking arm includes a first side surface and a second side surface connected downstream of the first side surface and maintaining an obtuse angle with the first side surface; when the blocking arm is in the first position and the third position, it does not contact the driving member on the corresponding side of the tilting tray sorting trolley passing through the blocking arm; When the blocking arm is in the second position, the first side surface cooperates with the driving member on the corresponding side of the tilting sorting trolley moving toward the first side surface to make the tray support rotate relative to the frame by a predetermined angle, and the second side surface cooperates with the driving member to keep the tray support at the predetermined angle relative to the frame.

6. The overturning and sorting trolley according to claim 5 is characterized in that: The blocking arm is connected to the rotating shaft and can rotate around the rotating shaft, and a waist-shaped hole is provided on the blocking arm, and the extension direction of the waist-shaped hole is consistent with the length direction of the first side surface. The telescopic shaft of the mobile driver is connected to the blocking arm through a pin shaft that is penetrated through the waist-shaped hole and can move along the waist-shaped hole. In the second position, the telescopic shaft is perpendicular to the second side surface, and in the third position, the telescopic shaft is perpendicular to the first side surface.

7. The flip sorting trolley according to claim 1, characterized in that: The driving member cooperates with the rotation driving mechanism to make the tray bracket rotate 10-30 degrees relative to the frame.

8. The tilting tray sorting trolley according to any one of claims 1 to 7, characterized in that: A self-rotation drive mechanism is arranged downstream of each of the flipping drive components and is adjacent thereto. The self-rotation drive mechanism and the flipping drive components are distributed on opposite sides of the flip tray sorting trolley.

9. The tray sorting system is characterized by: It comprises a tray sorting machine as described in any one of claims 1-8.

10. The sorting method of the tilting tray sorting system according to claim 9, characterized in that: When it is necessary to sort the goods on a tilting tray sorting trolley, the sorting of the goods is achieved by the cooperation of the flipping and tilting of the tray assembly of the tilting tray sorting trolley and the rotation of the tray bracket.

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