Trolley compatible with trays of various sizes

Abstract

The invention relates to the technical field of SMT (Surface Mount Technology) processing, and provides a trolley compatible with trays with various sizes, which comprises a supporting assembly, at least one group of single-layer material box assembly and / or at least one group of double-layer material box assembly, the supporting assembly comprises a supporting seat and a plurality of groups of positioning and locking mechanisms arranged on the supporting seat; the supporting base is detachably connected with the single-layer material box assembly or the double-layer material box assembly through any set of positioning and locking mechanism. The single-layer material box assembly comprises a first material disc support. The double-layer material box assembly comprises a second material disc support and a third material disc support, and the second material disc support and the third material disc support are distributed in an up-down staggered mode. Free combination of different material frame assemblies is facilitated, material trays of various sizes can be stored in a compatible mode, material taking convenience is improved, material taking operation of different feeders is facilitated, the overall structure is simple, the manufacturing cost is low, the application range is expanded, and therefore the production and machining technology and the production efficiency are effectively improved.

Description

Technical Field

[0001] The present invention relates to the field of SMT processing technology, and more specifically to a trolley compatible with trays of various sizes. Background Art

[0002] The trolley is the feeding component of the SMT placement machine, which is used to cooperate with the feeder to realize continuous feeding operation. Most of the traditional trolleys configured by the placement machine companies have simple structures, and the position deviation of the material tray is large and unstable, and it is impossible to realize the automatic material tray pick-up and placement operation. In order to ensure the stability of the material tray, the subsequent improved trolley is to install a guide rail at the bottom of the material box. When taking the material tray, the material box is pulled out to realize the automatic material tray pick-up and placement operation, and then pushed into place after the material tray is placed. Since the existing trolley requires reciprocating push-pull motion, many mechanical parts are used, and its structure is relatively complex. Not only is the manufacturing cost high, but it is also not easy to operate. Moreover, the existing trolley is usually only suitable for one size of material tray, and is not compatible with material trays of multiple sizes. Material trays of multiple sizes cannot be freely combined on one trolley. It is difficult to meet the production and processing operation requirements of feeding materials from a trolley through material trays of multiple sizes. There are great limitations on the production and processing technology, which is easy to affect production efficiency. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a trolley compatible with trays of various sizes in view of the above-mentioned defects of the prior art.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a trolley compatible with material trays of various sizes, comprising a support assembly, at least one group of single-layer material box assemblies and / or at least one group of double-layer material box assemblies; the support assembly comprises a support seat and multiple groups of positioning and locking mechanisms arranged on the support seat; the support seat is detachably connected to the single-layer material box assembly or the double-layer material box assembly through any group of positioning and locking mechanisms; the single-layer material box assembly comprises a first material tray bracket; the double-layer material box assembly comprises a second material tray bracket and a third material tray bracket, and the second material tray bracket and the third material tray bracket are staggered up and down.

[0005] In some embodiments, the support seat includes a bottom plate, a connecting plate and a top plate, the bottom plate is arranged at the bottom of the connecting plate, and the top plate is arranged at the top of the connecting plate; multiple groups of the positioning and locking mechanisms are arranged on the top surface of the top plate.

[0006] In some embodiments, any group of the positioning and locking mechanisms includes a quick lock, which is arranged on the top surface of the top plate; the quick lock has a lock hole and a lock core, and the single-layer material box assembly and the double-layer material box assembly both include a locking pin adapted to the lock hole, and the locking pin is inserted into the lock hole and locked by the lock core.

[0007] In some embodiments, any group of the positioning and locking mechanisms also includes a bushing, which is also arranged on the top surface of the top plate, corresponding to the quick locker and with a spacing between them; a positioning hole is provided in the bushing, and the single-layer material box assembly and the double-layer material box assembly also include a positioning pin adapted to the positioning hole; when the locking pin is inserted into the locking hole, the positioning pin is inserted into the positioning hole.

[0008] In some embodiments, the top surface of the top plate is provided with a first through hole for installing a quick locker, and a second through hole for installing the bushing; when the quick locker is installed in the first through hole, the upward end surface of the quick locker is flush with the top surface of the top plate; when the bushing is installed in the second through hole, the upward end surface of the bushing is also flush with the top surface of the top plate.

[0009] In some embodiments, the single-layer material box assembly also includes a first support plate, a first fixing plate is provided at the bottom of the first support plate, and a locking pin and a positioning pin are provided at the bottom of the first fixing plate which are spaced apart; the first material tray bracket includes a first side plate and two groups of first guide wheel assemblies, and the first side plate is connected to one side of the first support plate through the two groups of first guide wheel assemblies; the first side plate is parallel to the first support plate; the two groups of the first guide wheel assemblies are spaced apart front to back, and a first material tray accommodating space is formed between the two groups of the first guide wheel assemblies and the first side plate and the first support plate.

[0010] In some embodiments, the double-layer material box assembly also includes a second support plate, a second fixing plate is provided at the bottom of the second support plate, and the bottom of the second fixing plate is also provided with locking pins and positioning pins distributed at intervals; the top of the second support plate is provided with a continuous first step and a second step, and the first step is higher than the second step; the second material tray bracket is arranged at the first step, and the third material tray bracket is arranged at the second step.

[0011] In some embodiments, the second material tray bracket includes a second side plate, a third side plate and two groups of second guide wheel assemblies, the second side plate is arranged at the first step, and the third side plate is connected to one side of the second side plate through the two groups of second guide wheel assemblies; the third side plate is parallel to the second side plate, and the two groups of the second guide wheel assemblies are spaced apart from each other in the front and back, and a second material tray accommodating space is formed between the two groups of the second guide wheel assemblies and the second side plate and the third side plate.

[0012] In some embodiments, at least two groups of third guide wheel assemblies are provided on one side surface of the second support plate, and at least two groups of the third guide wheel assemblies are distributed obliquely upward in a direction away from the third material tray rack; one group of the third guide wheel assemblies is located on a side of the second material tray rack away from the third material tray rack and close to the top of the second support plate.

[0013] In some embodiments, the top surface of the top plate is a slope, and the inclination angle of the slope is not less than 30°.

[0014] The beneficial effects of the present invention are as follows: different from the prior art, in the trolley compatible with material trays of various sizes of the present invention, the support seat can be detachably connected to the single-layer material box assembly or the double-layer material box assembly through any set of positioning and locking mechanisms, which is conducive to the free combination of different material rack assemblies, and can be compatible with the storage of material trays of various sizes, effectively improving the convenience of material retrieval to meet various material retrieval needs; the second material tray bracket and the third material tray bracket are staggered in the upper and lower parts to provide a reasonable material retrieval orientation, which helps to adapt to different feeders for material retrieval operations, the overall structure is simple, the manufacturing cost is low, and the scope of application is expanded, thereby effectively improving the production and processing technology and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic front side view of a trolley compatible with trays of various sizes in an embodiment of the present invention;

[0016] Figure 2 It is a schematic diagram of the connection between the support assembly and the single-layer material box assembly and the double-layer material box assembly in an embodiment of the present invention;

[0017] Figure 3 is a schematic structural diagram of a support base in an embodiment of the present invention;

[0018] Figure 4 2 is a schematic structural diagram of a single-layer material box assembly in an embodiment of the present invention;

[0019] Figure 5 2 is a schematic structural diagram of a double-layer material box assembly in an embodiment of the present invention;

[0020] Figure 6 is a schematic right view of a trolley compatible with trays of various sizes in an embodiment of the present invention;

[0021] The names and serial numbers marked in the figure are: support assembly-1; single-layer material box assembly-2; double-layer material box assembly-3; support seat-11; bottom plate-111; connecting plate-112; top plate-113; quick locker-41; locking pin-51; bushing-42; positioning pin-52; first support plate-20; first fixed plate-21; first side plate-221; first guide wheel assembly-222; connecting shaft-2220; first guide wheel-2221; second support plate-30; second fixed plate-31; first step-301; second step-302; second side plate-321; third side plate-322; second guide wheel assembly-323; third guide wheel assembly-33; material belt guide plate-330; second guide wheel-331. DETAILED DESCRIPTION

[0022] The terms "first", "second", "third" and "fourth" etc. in the specification and claims of the present invention and the drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0023] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0024] "Multiple" means two or more. "And / or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects are in an "or" relationship.

[0025] Moreover, the terms "up, down, front, back, left, right, upper end, lower end" and the like indicating directions are all based on the posture and position of the device or equipment described in this solution during normal use.

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be described clearly and completely in combination with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are partial embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0027] The embodiment of the present invention provides a trolley compatible with trays of various sizes, such as Figures 1 to 6 As shown in the figure, the trolley compatible with material trays of various sizes includes a support assembly 1, at least one group of single-layer material box assemblies 2 and / or at least one group of double-layer material box assemblies 3; the support assembly 1 includes a support seat 11 and multiple groups of positioning and locking mechanisms arranged on the support seat 11; the support seat 11 is detachably connected to the single-layer material box assembly 2 or the double-layer material box assembly 3 through any group of positioning and locking mechanisms; the single-layer material box assembly 2 includes a first material tray bracket; the double-layer material box assembly 3 includes a second material tray bracket and a third material tray bracket, and the second material tray bracket and the third material tray bracket are staggered up and down.

[0028] In this embodiment, the support seat 11 includes a bottom plate 111, a connecting plate 112 and a top plate 113. The bottom plate 111 is arranged at the bottom of the connecting plate 112 and is used to support the connecting plate 112. The top plate 113 is arranged on the top of the connecting plate 112. The connecting plate 112 is used to support the top plate 113. The top plate 113 is used to support at least one group of single-layer material box components 2 and / or at least one group of double-layer material box components 3; multiple groups of positioning and locking mechanisms are all arranged on the top surface of the top plate 113, so as to facilitate the installation and fixation of at least one group of single-layer material box components 2 and / or at least one group of double-layer material box components 3.

[0029] Specifically, any set of positioning and locking mechanisms includes a quick locker 41, which is arranged on the top surface of the top plate 113. The quick locker 41 has a lock hole and a lock core, and the single-layer material box assembly 2 and the double-layer material box assembly 3 both include a locking pin 51 adapted to the lock hole, and the locking pin 51 is locked by the lock core after being inserted into the lock hole. Among them, the top surface of the top plate 113 is provided with a first through hole for installing the quick locker 41. When the quick locker 41 is installed in the first through hole, the upward end surface of the quick locker 41 is flush with the top surface of the top plate 113, which is conducive to the single-layer material box assembly 2 or the double-layer material box assembly 3 being installed and fixed in place and fitting with the top surface of the top plate 113 to ensure the stability of the support. After the quick lock 41 and the locking pin 51 are engaged, the shear strength reaches 1100N and the tensile strength reaches 250N, which can support the gravity of the single-layer material box assembly 2 or the double-layer material box assembly 3 and the loading tray and material belt. The number of the first through holes is consistent with the number of the quick locks 41.

[0030] It should be noted that the quick lock 41 is a standard part with a self-locking function. The locking pin 51 is inserted into the lock core of the quick lock 41 to achieve engagement and self-locking. When it is needed to be opened, the unlocking button provided on the quick lock 41 can be pressed to unlock the lock, so that the locking pin 51 pops out. The structure of the quick lock 41 is relatively existing. In actual application, any suitable existing quick lock 41 can be referred to, so as to achieve locking of the locking pin 51.

[0031] Specifically, any set of positioning and locking mechanisms also includes a bushing 42, which is also arranged on the top surface of the top plate 113. The bushing 42 corresponds to the quick lock 41 and there is a spacing between the two. It can be understood that in the case of multiple sets of positioning and locking mechanisms, the bushing 42 and the quick lock 41 in each set of positioning and locking mechanisms are one-to-one corresponding, so as to realize the positioning and locking operation of any set of single-layer material box components 2 or double-layer material box components 3. The bushing 42 has a positioning hole, and the single-layer material box component 2 and the double-layer material box component 3 also include a positioning pin 52 adapted to the positioning hole. When the locking pin 51 is inserted into the locking hole, the positioning pin 52 is also inserted into the positioning hole, which is conducive to improving the convenience of the installation and locking operation. Among them, the top surface of the top plate 113 is also provided with a second through hole for installing the bushing 42; the positioning pin 52 is in the shape of a rhombus, and the second through hole is adapted to the positioning pin 52. When the bushing 42 is installed in the second through hole, the end surface of the bushing 42 facing upward is also flush with the top surface of the top plate 113, which is conducive to the single-layer material box assembly 2 or the double-layer material box assembly 3 being installed and fixed in place to fit with the top surface of the top plate 113 to ensure the stability of the support. The number of the second through holes is the same as the number of the bushings 42.

[0032] In this embodiment, the single-layer material box assembly 2 also includes a first support plate 20, a first fixed plate 21 is provided at the bottom of the first support plate 20, and a locking pin 51 and a positioning pin 52 are provided at the bottom of the first fixed plate 21. The first fixed plate 21 is stably mounted on the top plate 113 through the locking pin 51 and the positioning pin 52 thereon. The first material tray bracket includes a first side plate 221 and two groups of first guide wheel assemblies 222. The first side plate 221 is connected to one side of the first support plate 20 through the two groups of first guide wheel assemblies 222; the first side plate 221 is parallel to the first support plate 20, and a gap for accommodating the material tray is formed between the first side plate 221 and the opposite side of the first support plate 20. The two groups of first guide wheel assemblies 222 are spaced apart from each other, and a first material tray accommodating space is formed between the two groups of first guide wheel assemblies 222 and the first side plate 221 and the first support plate 20. The top surfaces of the first side plate 221 and the first support plate 20 are flush and parallel to the top surface of the top plate 113, which is convenient for taking and placing the material tray. The first guide wheel assembly 222 is composed of a connecting shaft 2220 and a first guide wheel 2221. Its specific structural layout is as follows: Figure 4 shown.

[0033] In this embodiment, the double-layer material box assembly 3 also includes a second support plate 30, a second fixing plate 31 is provided at the bottom of the second support plate 30, and a locking pin 51 and a positioning pin 52 are also provided at the bottom of the second fixing plate 31. The second fixing plate 31 is stably mounted on the top plate 113 through the locking pin 51 and the positioning pin 52 thereon. A continuous first step 301 and a second step 302 are provided at the top of the second support plate 30, and the first step 301 is higher than the second step 302. The second material tray bracket is arranged at the first step 301, and the third material tray bracket is arranged at the second step 302. Then, the position height of the second material tray bracket is higher than the third material tray bracket, so that the second material tray bracket and the third material tray bracket are in an up-down staggered distribution state, which helps to adapt to different feeders for material picking operations and avoid material picking restrictions caused by the height difference inside the feeder base. When taking materials, the material belt of the material tray stored in the second material tray bracket is used as the upper material belt, and the material belt of the material tray stored in the third material tray bracket is used as the lower material belt, so as to facilitate the upper and lower conveyance of the material belts in different material trays.

[0034] Specifically, the second tray support includes a second side plate 321, a third side plate 322 and two sets of second guide wheel assemblies 323. The second side plate 321 is arranged at the first step 301, and the third side plate 322 is connected to one side of the second side plate 321 through the two sets of second guide wheel assemblies 323; the third side plate 322 is parallel to the second side plate 321, and a gap for accommodating the tray is also formed between the third side plate 322 and the opposite side of the second side plate 321. The two sets of second guide wheel assemblies 323 are spaced apart from each other, and a second tray accommodating space is formed between the two sets of second guide wheel assemblies 323 and the second side plate 321 and the third side plate 322. Among them, the treads of the first step 301 and the second step 302 are both parallel to the top surface of the top plate 113, and the top surfaces of the third side plate 322 and the second side plate 321 are flush and parallel to the top surface of the top plate 113, so as to facilitate the taking and placing of the tray. The structural layout of the second guide wheel assembly 323 is the same as that of the first guide wheel assembly 222. Figure 5 shown.

[0035] In this embodiment, the first tray accommodating space is larger than the second tray accommodating space, and the size of the tray that can be stored in the first tray accommodating space is larger than the size of the tray that can be stored in the second tray accommodating space. For example, the size of the tray that can be stored in the first tray accommodating space is 13 inches, while the size of the tray that can be stored in the second tray accommodating space is 7 inches.

[0036] It should be noted that, in this embodiment, the structural layout of the third tray support and the size of the tray accommodating space it has are the same as those of the second tray support, that is, the size of the tray that can be stored by the third tray support is also 7 inches. In other embodiments, the third tray support may also adopt other suitable structural layouts, and the size of the tray accommodating space it has may be the same as or different from that of the second tray accommodating space, so as to meet the storage of the corresponding trays and the transmission of the feed belt.

[0037] In this embodiment, two groups of third guide wheel assemblies 33 are provided on one side of the second support plate 30, and the two groups of third guide wheel assemblies 33 are distributed obliquely upward one by one in the direction away from the third material tray rack; one group of third guide wheel assemblies 33 is located on the side of the second material tray rack away from the third material tray rack and close to the top of the second support plate 30. When the flyer is located on the side of the second material tray bracket away from the third material tray bracket, since the third material tray bracket is far away from the flyer, the material belt of the material tray stored in the third material tray bracket can be transmitted by two groups of third guide wheel assemblies 33 to ensure the stability of transmission. Among them, the third guide wheel assembly 33 is composed of a material belt guide plate 330 and two second guide wheels 331, and the two second guide wheels 331 are correspondingly located on both sides of the material belt guide plate 330, and a gap is formed between the material belt guide plate 330 and the two second guide wheels 331 for the supply belt to pass through, and its specific structural layout is shown in the figure.

[0038] It should be noted that the guidance of each guide wheel in the two sets of third guide wheel assemblies 33 may be based on the direction of the material belt designed in actual application, and the attached drawings are only examples.

[0039] In this embodiment, the top surface of the top plate 113 is an inclined surface, and the inclination angle of the inclined surface is not less than 30°. Specifically, the inclination angle of the inclined surface is 35°, so as to facilitate the material taking and unloading manipulator to take the material tray. The way to make the top surface of the top plate 113 an inclined surface is, for example: the upper end of the connecting plate 112 is designed to be an inclined surface, then when the top plate 113 is installed on the connecting plate 112, the top plate 113 is also correspondingly inclined, and the top surface of the top plate 113 is also inclined, and at the same time, the first support plate 20 and the second support plate 30 on the top plate 113 are also synchronously inclined. When selecting the inclination direction, the side provided with the third material tray bracket can be tilted downward.

[0040] In specific implementation applications, the trolley compatible with trays of various sizes is usually fixed below an SMT placement machine (not shown in the drawings), wherein the conveying direction of the tapes of the trays of various sizes is as follows: Figure 6As shown. The material belt of the material tray (13-inch material tray) in the first material tray holder is directly connected to the feeder (not shown in the figure), the material belt of the material tray (7-inch material tray) in the second material tray holder is directly connected to the feeder (not shown in the figure), and the material belt of the material tray (7-inch material tray) in the third material tray holder passes through the middle of two sets of material belt guide plates and guide wheels before connecting to the feeder (not shown in the figure), which is suitable for different SMT placement machines. By cooperating with a suitable SMT material tray automatic pick-up and placement mechanism, efficient automatic material pick-up and placement operations can also be achieved. The SMT material tray automatic pick-up and placement mechanism is, for example, a commonly used pick-up and placement robot in the prior art.

[0041] It should be understood that, for ordinary technical workers in the field, improvements or changes can be made based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A trolley compatible with trays of various sizes, characterized by: It includes a support component, at least one group of single-layer material box components and / or at least one group of double-layer material box components; the support component includes a support seat and multiple groups of positioning and locking mechanisms arranged on the support seat; the support seat is detachably connected to the single-layer material box component or the double-layer material box component through any group of positioning and locking mechanisms; the single-layer material box component includes a first material tray bracket; the double-layer material box component includes a second material tray bracket and a third material tray bracket, and the second material tray bracket and the third material tray bracket are staggered up and down.

2. The trolley compatible with trays of various sizes according to claim 1, characterized in that: The support seat comprises a bottom plate, a connecting plate and a top plate, wherein the bottom plate is arranged at the bottom of the connecting plate, and the top plate is arranged at the top of the connecting plate; a plurality of groups of the positioning and locking mechanisms are arranged on the top surface of the top plate.

3. The trolley compatible with trays of various sizes according to claim 2, characterized in that: Any group of the positioning and locking mechanisms includes a quick locker, which is arranged on the top surface of the top plate; the quick locker has a lock hole and a lock core, and the single-layer material box assembly and the double-layer material box assembly both include a locking pin adapted to the lock hole, and the locking pin is locked by the lock core after being inserted into the lock hole.

4. The trolley compatible with trays of various sizes according to claim 3, characterized in that: Any group of the positioning and locking mechanisms also includes a bushing, which is also arranged on the top surface of the top plate. The bushing corresponds to the quick locker and there is a distance between the two. A positioning hole is provided in the bushing. The single-layer material box assembly and the double-layer material box assembly also include a positioning pin that matches the positioning hole. When the locking pin is inserted into the locking hole, the positioning pin is inserted into the positioning hole.

5. The trolley compatible with trays of various sizes according to claim 4, characterized in that: The top surface of the top plate is provided with a first through hole for installing a quick locker, and a second through hole for installing the bushing; when the quick locker is installed in the first through hole, the upward end surface of the quick locker is flush with the top surface of the top plate; when the bushing is installed in the second through hole, the upward end surface of the bushing is also flush with the top surface of the top plate.

6. The trolley compatible with trays of various sizes according to claim 4 or 5, characterized in that: The single-layer material box assembly also includes a first support plate, a first fixing plate is provided at the bottom of the first support plate, and a locking pin and a positioning pin are provided at the bottom of the first fixing plate which are distributed at intervals; the first material tray bracket includes a first side plate and two groups of first guide wheel assemblies, and the first side plate is connected to one side of the first support plate through the two groups of first guide wheel assemblies; the first side plate is parallel to the first support plate; the two groups of the first guide wheel assemblies are distributed at intervals front and back, and a first material tray accommodating space is formed between the two groups of the first guide wheel assemblies and the first side plate and the first support plate.

7. The trolley compatible with trays of various sizes according to claim 4, characterized in that: The double-layer material box assembly also includes a second support plate, a second fixing plate is provided at the bottom of the second support plate, and the bottom of the second fixing plate is also provided with locking pins and positioning pins distributed at intervals; the top of the second support plate is provided with a continuous first step and a second step, and the first step is higher than the second step; the second material tray bracket is arranged at the first step, and the third material tray bracket is arranged at the second step.

8. The trolley compatible with trays of various sizes according to claim 7, characterized in that: The second material tray bracket includes a second side plate, a third side plate and two groups of second guide wheel assemblies, the second side plate is arranged at the first step, and the third side plate is connected to one side of the second side plate through the two groups of second guide wheel assemblies; the third side plate is parallel to the second side plate, and the two groups of the second guide wheel assemblies are spaced apart from each other in the front and back, and a second material tray accommodating space is formed between the two groups of the second guide wheel assemblies and the second side plate and the third side plate.

9. The trolley compatible with trays of various sizes according to claim 7 or 8, characterized in that: At least two groups of third guide wheel assemblies are provided on one side surface of the second support plate, and at least two groups of the third guide wheel assemblies are distributed obliquely upward in a direction away from the third material tray rack; one group of the third guide wheel assemblies is located on a side of the second material tray rack away from the third material tray rack and close to the top of the second support plate.

10. The trolley compatible with trays of various sizes according to any one of claims 2-5, 7 and 8, characterized in that: The top surface of the top plate is an inclined surface, and the inclination angle of the inclined surface is not less than 30°.

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