Tilting sorter, tilting sorting system and tilting sorting trolley

Abstract

This invention discloses a tilting sorting machine and a tilting sorting system. The tilting sorting machine includes a track and a tilting sorting trolley. The tilting sorting trolley includes a frame and a tilting assembly. The tilting assembly includes a tray. A swing rod at the center of the tray's bottom is pivotally connected to a first support member on the frame via a pivot shaft. A drive pin parallel to the pivot shaft is provided on the swing rod. The drive pin is inserted into a drive hole on a second support member, which can translate in a direction perpendicular to the pivot shaft. A vertical limiting plate is provided on the track to limit the translation of the second support member and keep the tray upright. Notches distributed along the extension direction of the track are provided on the vertical limiting plate. An unloading and reset mechanism is provided at the notches. The unloading and reset mechanism drives the second support member to reciprocate through the notches to achieve tilting and uprighting of the tray. The tilting sorting trolley of this invention has a simplified structure, and the method of driving the tray to tilt by reciprocating the second support member changes the conventional driving method.

Description

Technical Field

[0001] This invention relates to the field of logistics sorting equipment, and in particular to a flip-top sorting machine, a flip-top sorting system, and a flip-top sorting trolley. Background Technology

[0002] Tilting sorters are commonly used sorting equipment in logistics sorting.

[0003] The invention with authorization announcement number CN 208245212 U discloses a usable structure.

[0004] In this structure, the flap needs to be lifted by a lifting device to raise the guide plate so that the limiting component can disengage from the limiting pin and thus tilt. This structure requires frequent impacts to switch the state of the limiting component, which can easily cause failure of the limiting component and the limiting pin, and also requires an additional leveling ramp to keep the flap upright.

[0005] The invention patent application with publication number CN112474371A discloses another usable structure.

[0006] In this structure, a complex drive mechanism is set on the flip-board sorting trolley to drive the platform to flip. At the same time, a complex slot structure and switching structure are also required on the track to achieve sorting. Its structure is complex and difficult to implement.

[0007] The invention patent application with publication number CN116443512A discloses yet another usable structure.

[0008] In this structure, a motor is installed on the tilting sorting trolley to drive the carrier plate to tilt. This not only increases the equipment cost and operating cost, but also requires power to the tilting sorting trolley, making it difficult to implement. Summary of the Invention

[0009] The purpose of this invention is to solve the above-mentioned problems existing in the prior art and to provide a flip-top sorting machine, a flip-top sorting system and a flip-top sorting trolley.

[0010] The objective of this invention is achieved through the following technical solution: A tilting sorting machine includes a track and a series of tilting sorting trolleys connected in a circle. Each tilting sorting trolley includes a frame and a tilting assembly mounted on the frame. The tilting assembly includes a tray. A swing rod at the center of the bottom of the tray is pivotally connected to a first support member via a pivot shaft. The first support member is fixed to the frame. A drive pin parallel to the pivot shaft is provided on the swing rod. The drive pin is inserted into a drive hole on a second support member. The second support member is translatably mounted on the frame in a direction perpendicular to the pivot shaft. A vertical limiting plate is provided on the track to limit the translation of the second support member so that the tray remains upright. A notch is provided on the vertical limiting plate along the extension direction of the track. An unloading and reset mechanism is provided at the notch. The unloading and reset mechanism drives the second support member to reciprocate through the notch to tilt and upright the tray.

[0011] Preferably, the output side of the tray is provided with a row of rollers.

[0012] Preferably, the second support member is provided with a support hole for the pivot shaft to be inserted, and the support hole extends along the moving direction of the second support member.

[0013] Preferably, the first support member is disposed on the side of a base, and the second support member is disposed on the side of a slider, the slider being slidably disposed on the base.

[0014] Preferably, the sliding member has functional components symmetrically distributed on both sides of the second support member at both ends.

[0015] Preferably, the functional component is a roller, and the axis of the roller extends in the vertical direction.

[0016] Preferably, the track includes two opposing C-shaped grooves. The free end of the upper plate of the C-shaped groove is provided with an upwardly extending vertical limiting plate, and the sliding member where the second support member is located or the two functional members on the sliding member are limited between the two vertical limiting plates.

[0017] Preferably, the notches at the two vertical limiting plates correspond one-to-one. The unloading and resetting mechanism includes two pushers corresponding to a pair of opposing notches. The two pushers are mounted on uprights located outside the two sides of the track. The two uprights are mounted on a carrier plate. The carrier plate is connected to a drive device that drives it to translate in a direction perpendicular to the track.

[0018] Preferably, the pusher includes a push surface that matches the notch, and normally, the two push surfaces are flush with the inner sidewalls of the two vertical limiting plates.

[0019] A flip-top sorting system, including any of the flip-top sorting machines described above, wherein sorting slots are provided on the side of the track.

[0020] A tilting sorting trolley includes a frame and a tilting assembly mounted on the frame. The tilting assembly includes a tray. A swing rod at the center of the bottom of the tray is pivotally connected to a first support member via a pivot shaft. The first support member is fixed to the frame. A drive pin parallel to the pivot shaft is provided on the swing rod. The drive pin is inserted into a drive hole on a second support member. The second support member is translatably mounted on the frame in a direction perpendicular to the pivot shaft.

[0021] The advantages of the technical solution of this invention are mainly reflected in: The structure of the tilting sorting cart of the present invention is greatly simplified compared with the prior art, which is conducive to the miniaturization and weight reduction of the tilting sorting cart. At the same time, it does not require power supply to the tilting sorting cart, which effectively reduces the implementation difficulty of the tilting sorting machine. In addition, the method of using the reciprocating movement of the second support member to drive the pallet to flip changes the conventional driving method. Compared with the existing method, the reciprocating movement of the second support member is easier to achieve stably.

[0022] The structure of the tilting sorting trolley of the present invention allows the pallet to be kept upright during operation simply by setting a vertical limiting plate on the track that matches the functional components, thus ensuring the stability of operation. At the same time, by simply opening a notch at the vertical limiting plate to allow the functional components to move, the pallet can be easily tilted and reset in conjunction with the unloading and resetting mechanism. This is easy to implement and eliminates the vibration caused by the impact when the rollers on the pallet come into contact with the ramp in the prior art. It also eliminates the need to set up an additional straightening ramp to achieve the straightening of the pallet.

[0023] The pallet of the present invention is provided with rollers on the sorting side, which enables packages to slide out of the pallet more smoothly and flexibly for sorting.

[0024] The unloading and resetting mechanism of the present invention can achieve unloading and resetting by driving the sliding member to move back and forth through a power source, and can achieve sorting in two directions through a single unloading and resetting mechanism, resulting in a simpler structure. Attached Figure Description

[0025] Figure 1 This is a perspective view of the tilting sorting machine of the present invention. Only part of the tilting sorting trolley and unloading and resetting mechanism are shown in the figure. Figure 2 This is a perspective view of the tilting sorting cart of the present invention; Figure 3 This is a side cross-sectional view of the flip-top sorting machine of the present invention; Figure 4 This is a side view of the tilting sorting cart of the present invention; Figure 5 This is a front view of one implementation of the unloading and reset mechanism of the present invention; Figure 6 This is a front view of another implementation of the unloading and reset mechanism of the present invention; Figure 7 This is a perspective view of the flip-top sorting system of the present invention. Only part of the flip-top sorting trolley, unloading and resetting mechanism, sorting slots and storage containers are shown in the figure. Detailed Implementation

[0026] The objectives, advantages, and features of this invention will be illustrated and explained through the following non-limiting description of preferred embodiments. These embodiments are merely typical examples of applying the technical solutions of this invention, and all technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by this invention.

[0027] In the description of the solution, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying 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, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] Example 1 The flip-top sorting machine disclosed in this invention will be described below with reference to the accompanying drawings. Figure 1 Appendix Figure 2 As shown, it includes a track 100 and a series of tilting sorting trolleys 200 connected in a circle. The tilting sorting trolley 200 includes a frame 201 and a tilting assembly 202 mounted on the frame 201. The tilting assembly 202 includes a tray 203. A swing rod 204 at the bottom center of the tray 203 is pivotally connected to a first support member 206 via a pivot shaft 205. The first support member 206 is fixed to the frame 201. A drive pin 207 parallel to the pivot shaft 205 is provided on the swing rod 204. The drive pin 207 is inserted into a drive hole 209 on a second support member 208. The second support member 208 can be translatably mounted on the frame 201 in a direction perpendicular to the pivot shaft 205.

[0029] As attached Figure 2 Appendix Figure 3As shown, the track 100 is mounted on the base frame 300 and is a structure that matches the vehicle frame 201. Correspondingly, the vehicle frame 201 includes a support plate 210. Vertical mounting plates 211 are provided on opposite sides of the support plate 210, extending below the support plate. Traveling wheels 212 are mounted on the vertical mounting plates 211. Each side may have only one or more traveling wheels 212, preferably two. The axes of the traveling wheels extend horizontally and are perpendicular to the pivot axis. Simultaneously, a guide wheel 213 is also provided on the vertical mounting plate 211, located between the two traveling wheels 212. The axis of the guide wheel 213 extends vertically. Correspondingly, the track 100 includes C-shaped grooves 101 that match the two side wheels 212. The openings of the two C-shaped grooves 101 face each other, and the wheels 212 are rotatably disposed within the C-shaped grooves 101. The bottom of the wheels 212 is located on the bottom plate 102 of the C-shaped groove 101, and the top of the wheels 212 contacts or maintains a slight gap with the inner wall of the upper plate 103 of the C-shaped groove 101. The wheel surface of the limiting wheel contacts the inner wall of the vertical plate 104 of the C-shaped groove 101, thereby enabling the frame 201 to move along the track 100. Meanwhile, vertical connecting plates 105 are respectively provided at the free ends of the bottom plates 102 of the two C-shaped grooves 101. The bottoms of the two C-shaped grooves 101 and the vertical connecting plates 105 are provided on a set of support plates 106. The support plates 106 are provided on a set of base frames 300. Profiles 301 located on the top of the base frames 300 are provided on both sides of the support plates 106. The support plates 106 are also provided with U-shaped grooves 107 for installing the primary of the linear motor.

[0030] As attached Figure 1 Appendix Figure 2 As shown, on the other two sides of the support plate 210, there are rod end joint bearings 214 facing each other. Each rod end joint bearing 214 is connected to the rod end joint bearing 214 of the adjacent pallet sorting trolley through a connecting rod 400.

[0031] As attached Figure 2 As shown, the pallet 203 includes a pallet plate 215, and the four sides of the pallet plate 215 are respectively provided with upward and outward inclined plates 216, so the pallet 203 is a groove. The pallet plate 215 and the two inclined plates 216 for unloading are provided with lightweight holes. At the same time, the outer side of the inclined plate 216 for unloading is the output side and is provided with a row of rollers 217. The rollers 217 can be universal balls fixed to the bottom of the inclined plate 216 and with the ball protruding to the top surface of the inclined plate 216.

[0032] The first support member 206 may be a vertical plate perpendicular to the pivot axis and disposed on the side of a base 218, the base 218 being fixed at the middle position of the top of the support plate. The pivot axis 205 may be fixed to the top position of the first support member 206 by a bearing, and the pivot axis 205 may be fixedly connected to the swing rod 204. Alternatively, the pivot axis 205 may be fixedly connected to the first support member 206, and the swing rod 204 may be connected to the pivot axis 205 by a bearing.

[0033] The second support member 208 is also a vertical plate and is disposed on the side of the slider 219. The first support member 206 and the second support member 208 are parallel to each other. The slider 219 is slidably disposed in a through groove on the base 218. Meanwhile, the drive pin 207 is located below the pivot shaft 205. The drive hole 209 can be a strip-shaped hole extending in the vertical direction or an arc-shaped hole. The width of the drive hole 209 is approximately equal to the diameter of the drive pin 207. Thus, when the second support member 208 slides relative to the first support member 206, it can drive the drive pin 207 to rotate around the pivot shaft 205, thereby driving the tray 203 to tilt for sorting.

[0034] In one embodiment, as shown in the appendix Figure 2 As shown, the top of the second support member 208 may be lower than the pivot axis 205. In such a structure, the pivot axis 205 provides poor support stability for the pallet 203, which is not conducive to the transportation of heavy packages.

[0035] In a more preferred embodiment, as shown in the appendix Figure 4 As shown, the second support member 208 can extend to the top of the pivot shaft 205, and the second support member 208 is provided with a support hole 220 for the pivot shaft 205 to be inserted. The support hole 220 extends along the moving direction of the second support member 208, so that the pivot shaft 205 is mounted on the first support member 206 and the second support member 208, and has better support.

[0036] When the drive pin 207 is directly below the pivot shaft 205, the tray 203 remains in an upright position, as shown in the attached diagram. Figure 2 As shown.

[0037] When the drive pin 207 is located to the right of the pivot shaft 205, the tray 203 tilts to the left for sorting, as shown in the attached diagram. Figure 3 As shown.

[0038] When the drive pin 207 is located to the left of the pivot shaft 205, the tray 203 tilts to the right for sorting, as shown in the attached diagram. Figure 4 As shown.

[0039] When it is not necessary to tilt the tray 203, in order to keep the tray 203 in a straight position, as shown in the attached... Figure 1 Appendix Figure 3 As shown, the free end of the upper plate 103 of the C-shaped groove 101 is provided with a vertical limiting plate 108. The length of the sliding member 219 is equivalent to the length and height between the two vertical limiting plates 108, so that the two ends of the sliding member 219 contact or maintain a small gap with the inner sidewalls of the two vertical limiting plates 108. Therefore, the sliding member 219 is restricted in position by the two vertical limiting plates 108 and cannot move horizontally so that the tray 203 can be kept in a straight position.

[0040] In a more preferred embodiment, to avoid wear caused by continuous friction between the sliding member 219 and the vertical limiting plate 108, as shown in the attached... Figure 2 As shown, functional components 221 are symmetrically distributed on both sides of the second support 208 at both ends of the slider 219. The functional component 221 can be a slider, or more preferably, a roller. The axis of the roller extends in the vertical direction, and the wheel surface of the roller contacts the inner wall of the vertical limiting plate 108, so that the roller can roll along the vertical limiting plate 108 to reduce wear.

[0041] As attached Figure 1 As shown, in order to drive the sliding member 219 to reciprocate for unloading and resetting, the vertical limiting plate 108 is provided with notches 109 distributed along the extension direction of the track 100. The length of the notches 109 can be designed according to the moving speed of the pallet sorting trolley, etc., and is not limited here. If sorting only needs to be done to one side, the notches 109 can be provided at only one vertical limiting plate 108. At the same time, an unloading and resetting mechanism 500 is provided at each notch 109. The unloading and resetting mechanism 500 drives the second support member 208 to reciprocate through the notch 109 to realize the tilting and straightening of the pallet 203.

[0042] In one embodiment, the unloading and resetting mechanism 500 can achieve the sliding of the slider 219 by magnetic attraction and / or magnetic repulsion. For example, magnets are respectively provided at both ends of the slider 219, and an electromagnet corresponding to the magnet at one end of the slider 219 is provided at each notch 109. Another electromagnet corresponding to each notch 109 and the magnet at the other end of the slider 219 is provided on the outside of the vertical limiting plate 108 where the notch 109 is not provided. Furthermore, the magnetic poles of each electromagnet are opposite or the same as the magnetic poles of its corresponding magnet. Thus, when sorting to one side is required, the sliding of the slider 219 is achieved by utilizing the principle that like magnetic poles repel and unlike magnetic poles attract.

[0043] In a more preferred embodiment, as shown in the appendix Figure 5As shown, notches 109 are provided at both vertical limiting plates 108, and the positions of the notches 109 at the two vertical limiting plates 108 correspond one-to-one. The unloading and resetting mechanism 500 includes two pushers 501 corresponding to a pair of notches 109. The specific shape of the pushers 501 can be designed as needed. For example, the pushers 501 are push blocks or push plates. The two pushers 501 have opposing push surfaces, which match the notches 109. Under normal conditions, the two push surfaces are flush with the inner sidewalls of the two vertical limiting plates 108. This can block the notches 109 when no drive is needed, thereby ensuring that the pallet 203 of the pallet sorting trolley passing through the notches 109 will not tilt, which is beneficial to ensuring sorting accuracy.

[0044] As attached Figure 5 As shown, the two pushers 501 are mounted on the uprights 502 located on both sides of the track 100. The uprights 502 are L-shaped, and their upper horizontal bars are located above the track 100. The vertical bars of the two uprights 502 are mounted on the same carrier plate 503. The carrier plate 503 is connected to a drive device 504 that drives it to translate in a direction perpendicular to the track 100. The support plate 210 is movably mounted on the support rail 505 at the bottom of the track 100. The support rail 505 is fixed to the bottom of the two profiles 301. The drive device 504 can be a known cylinder, hydraulic cylinder, electric cylinder, or linear motor, etc. The drive device 504 is fixed below the support rail 505 and on the mounting bracket 506 mounted on the support rail 505. Furthermore, the two pushers 501 can drive the functional component to move the slider 219. Alternatively, without the functional component, the pushers 501 can directly apply force to both ends of the slider 219 to drive its movement. Of course, in other embodiments, as shown in the attached... Figure 6 As shown, the two uprights 502 can also be mounted on two independent carrier plates 503. The two carrier plates 503 are slidably mounted on the support cabinet and connected to a drive device 504 that drives them to move.

[0045] Normally, the two pushers 501 are symmetrically distributed on both sides of the track 100 and do not perform sorting. When it is necessary to tilt the pallet 203 to one side for sorting, taking leftward tilting as an example, the drive device 504 drives the two pushers 501 to move synchronously to the right. Thus, the pusher 501 can push the rightmost of the two functional components located between the two vertical limiting plates 108 through the notch 109 on the right vertical limiting plate to the outside of the right vertical limiting plate 108. At this time, the sliding member 219 moves to the right, driving the pallet 203 to tilt to the left for sorting, as shown in the attached diagram. Figure 3As shown. After sorting is completed, the drive device 504 drives the two pushers 501 to move in the opposite direction and reset, thereby pushing the two functional components to move in the opposite direction back between the two vertical limit plates 108 and restoring the pallet 203 to the upright state. This structure is beneficial for the pallet sorting trolley to run at a relatively high moving speed.

[0046] Of course, in another embodiment, the two pushers 501 can be grippers that match the rollers. The grippers can hold the rollers, so that when the pusher 501 on the first side drives the roller on its corresponding side to move toward the functional component on the second side, the roller on the other side of the slider 219 is embedded in the slot of the pusher 501 on the second side. When the functional component needs to be reset, the pusher 501 on the second side moves toward the pusher 501 on the first side, and at the same time, the pusher 501 on the first side moves in the opposite direction to reset. After the roller moves in the opposite direction to reset, the pusher 501 on the second side moves in the opposite direction to reset again.

[0047] However, in this structure, the pallet sorting trolley is preferably stopped or moves at a slower speed so that the pusher 501 can smoothly move the functional components to achieve the sorting and resetting of the pallet 203.

[0048] Meanwhile, in order to drive the pallet sorting trolley to move along the track 100, as shown in the attached... Figure 2 Appendix Figure 3 As shown, a friction drive plate or a secondary of a linear motor 222 is provided at the bottom of the support plate 210 of the frame 201. A friction drive mechanism that cooperates with the friction drive plate or a primary of a linear motor 600 that matches the secondary of the linear motor is provided on the track 100. The specific structures of the friction drive mechanism and the primary and secondary of the linear motor are known technologies and are not innovations of this invention, so they will not be described in detail here.

[0049] Preferably, the secondary winding of the linear motor has a flat design. To facilitate adjustment of the air gap between the primary and secondary windings of the linear motor, as shown in the attached figure... Figure 3 As shown, the primary of the linear motor is mounted on a U-shaped mounting base. The mounting base is fixed to the height adjustment component 110 at the U-shaped groove 107. The height adjustment component includes a screw fixed at the U-shaped groove 107 by a locking nut. The screw is provided with a height adjustment nut and a fastening nut. The screw passes through the lower bent plate of the mounting base. The height adjustment nut is located below the lower bent plate. The fastening nut is located above the lower bent plate and cooperates with the height adjustment nut to fix the lower bent plate.

[0050] Example 2 This embodiment discloses a tray-flipping sorting system, as shown in the attached figure. Figure 7As shown, including the tilting sorting machine as described above, the track 100 is provided with sorting slots 700 on its side. The sorting slots 700 are distributed at least on one side of the track 100. Preferably, sorting slots 700 are provided on both sides of the track 100, and the sorting slots 700 on both sides correspond one-to-one. A pair of sorting slots 700 with corresponding positions corresponds to an unloading and reset mechanism 500. A storage container 800 is provided at the lower end of each sorting slot 700.

[0051] Meanwhile, a manual loading position 900 is also provided on the side of the track 100. The operator places the package with the barcode facing a predetermined direction onto the flip-top sorting trolley at the manual loading position 900. As the package moves with the flip-top sorting trolley 200 past the scanning device 001, the scanning device 001 scans the barcode to obtain the corresponding sorting slot 700. The scanning device 001 can be positioned above the flip-top sorting trolley and read the barcode downwards; alternatively, it can be positioned on the side of the track 100 and scan the barcode from the side of the package. The control device binds the obtained sorting slot 700 of the package to the pallet sorting trolley containing the package. When the position tracking of the pallet sorting trolley determines that it has moved to the sorting slot 700 corresponding to the package, the unloading and reset mechanism 500 is activated, causing the pallet 203 of the pallet sorting trolley to tilt for sorting. After sorting is completed, the pallet 203 is reset and straightened.

[0052] This invention has many other embodiments, and all technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of this invention.

Claims

1. A tilting sorting machine, comprising a track and a series of tilting sorting trolleys connected in a circle, wherein each tilting sorting trolley includes a frame and a tilting assembly mounted on the frame, the tilting assembly including a tray that tilts to the side of the track for sorting, characterized in that: The swing rod at the middle position of the bottom of the tray is pivotally connected to the first support member via a pivot shaft. The first support member is fixed on the frame. The swing rod is provided with a drive pin parallel to the pivot shaft. The drive pin is inserted into a drive hole on the second support member. The second support member can be translatably mounted on the frame in a direction perpendicular to the pivot shaft. The track is provided with a vertical limiting plate for limiting the translation of the second support member so as to keep the pallet upright; the vertical limiting plate is provided with notches distributed along the extension direction of the track, and an unloading and reset mechanism is provided at the notches. The unloading and reset mechanism drives the second support member to reciprocate through the notches to realize the tilting and uprighting of the pallet.

2. The flip-top sorting machine according to claim 1, characterized in that: The output side of the tray is provided with a row of rollers.

3. The flip-top sorting machine according to claim 1, characterized in that: The second support member is provided with a support hole for the pivot shaft to be inserted, and the support hole extends along the moving direction of the second support member.

4. The flip-top sorting machine according to claim 1, characterized in that: The first support member is disposed on the side of a base, and the second support member is disposed on the side of a slider, the slider being slidably disposed on the base.

5. The flip-top sorting machine according to claim 4, characterized in that: The sliding member has functional components symmetrically distributed on both sides of the second support member at both ends.

6. The flip-top sorting machine according to claim 5, characterized in that: The functional component is a roller, and the axis of the roller extends in the vertical direction.

7. The flip-top sorting machine according to any one of claims 1-6, characterized in that: The track includes two opposing C-shaped grooves, and the free end of the upper plate of the C-shaped groove is provided with an upwardly extending vertical limiting plate. The sliding member where the second support member is located or the two functional members on the sliding member are limited between the two vertical limiting plates.

8. The flip-top sorting machine according to claim 7, characterized in that: The notches at the two vertical limiting plates correspond one-to-one. The unloading and resetting mechanism includes two pushers corresponding to a pair of opposing notches. The two pushers are set on the uprights located outside the two sides of the track. The two uprights are set on the carrier plate. The carrier plate is connected to a drive device that drives it to translate in a direction perpendicular to the track.

9. The flip-top sorting machine according to claim 8, characterized in that: The pusher includes a push surface that matches the notch. Normally, the two push surfaces are flush with the inner walls of the two vertical limiting plates.

10. A flip-top sorting system, characterized in that: The sorting machine includes the tilting sorting machine as described in any one of claims 1-9, wherein the side of the track is provided with sorting slots.

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