An electronic scale

Abstract

The utility model discloses an electronic scale, include: scale body, scale tray and drive component, scale tray includes: base and tray, base sets up on scale body, tray sets up on base, and it can overturn to the inclined state with respect to base to be used for unloading, drive component is used for drive tray overturn to the inclined state, that is to say, the electronic scale provided by the scheme, and the scale tray includes base and tray, and the base sets up on the scale body, and the tray is placed on the base, and it can overturn to the inclined state with respect to the base to be used for unloading, and the drive component is used for drive tray overturn to the inclined state, makes tray and can realize automatic overturn unloading, thereby can realize the automatic unloading of electronic scale, solves the problem existing in the prior art relying on manual unloading.

Description

Technical Field

[0001] This utility model relates to the field of testing instrument technology, and in particular to an electronic scale. Background Technology

[0002] Electronic scales are indispensable measuring devices in modern laboratories, pharmaceutical, food, and precious metal processing fields. Their core working principle involves converting the mass of materials into electrical signals using high-precision load cells, which are then processed and displayed digitally. Traditional electronic scales (such as laboratory scales) typically consist of a scale body and a weighing pan. The scale body includes sensors, a display unit, and a casing, enabling rapid and accurate weighing of materials. Although current electronic scales are quite mature in static weighing accuracy, the unloading process after weighing still heavily relies on manual operation, which has some drawbacks. For example, when weighing toxic, harmful, irritating, or highly sterile materials, manual unloading poses potential health and safety risks to operators, and it significantly impacts efficiency when continuously weighing different types of materials. Utility Model Content

[0003] In view of this, the present invention provides an electronic scale that can realize automatic unloading of materials, thus solving the problem of relying on manual unloading in existing systems.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] An electronic scale includes: a scale body, a scale pan, and a drive assembly;

[0006] The weighing pan includes: a base and a tray;

[0007] The base is mounted on the scale body;

[0008] The tray is disposed on the base and can be flipped to an inclined state relative to the base for unloading;

[0009] The drive assembly is used to drive the tray to tilt.

[0010] Optionally, the first side of the tray is rotatably connected to the first side of the base, and the tray can be flipped relative to the base about a first horizontal direction;

[0011] The drive component is disposed between the base and the tray, and is also used to drive the tray to return to a flat position, so that the tray is located on the base.

[0012] Optionally, the top of the base is provided with a mounting groove;

[0013] The drive component is disposed in the mounting slot of the base and is capable of driving the tray to switch back and forth between the flat state and the tilted state.

[0014] Optionally, the drive assembly includes: a translation component and a linkage;

[0015] The translation component is disposed in the mounting groove of the base along the second horizontal direction, and its translation part is capable of moving along the second horizontal direction; wherein, the second horizontal direction is perpendicular to the first horizontal direction;

[0016] The connecting rod is positioned above the translation component, with its first end rotatably connected to the translation part of the translation component and its second end rotatably connected to the bottom of the tray.

[0017] Optionally, the bottom of the tray is provided with a groove along the second horizontal direction and is located above the mounting groove;

[0018] The drive assembly also includes a hinged base;

[0019] The hinge seat is slidably disposed in the groove of the tray and can slide along the second horizontal direction;

[0020] The second end of the connecting rod is hinged to the hinge seat.

[0021] Optionally, when the pallet is in the flat position, the hinge seat is located at the first end of the slide groove, and the connecting rod is parallel to the translation assembly and located within the mounting groove; wherein, the first end of the slide groove is away from the first side of the pallet.

[0022] Optionally, the second end of the connecting rod is hinged to the hinge seat via a rotating shaft, and both ends of the rotating shaft extend out from both sides of the hinge seat.

[0023] The mounting groove is provided with a guide slope that is inclined toward the first side of the base and is located below the slide groove of the tray; wherein, when the tray is in the flat position, both ends of the rotating shaft are in contact with the guide slope.

[0024] Optionally, the translation component includes a lead screw assembly.

[0025] Optionally, the lead screw assembly includes: a lead screw, a threaded sleeve, and a drive motor;

[0026] The lead screw is rotatably disposed in the mounting groove and is distributed along the second horizontal direction;

[0027] The threaded sleeve is fitted onto the lead screw, and its bottom is in planar contact with the bottom of the mounting groove;

[0028] The drive motor is disposed in the mounting slot, and its output end is connected to one end of the lead screw for transmission.

[0029] The first end of the connecting rod is rotatably connected to the top of the threaded sleeve.

[0030] Optionally, the tray has a rectangular structure, and its second, third, and fourth sides are all provided with upward-curving guard edges.

[0031] As can be seen from the above technical solution, the electronic scale provided by this utility model includes a base and a tray. The base is set on the scale body, and the tray is placed on the base and can be flipped to an inclined state relative to the base for unloading. The drive component is used to drive the tray to flip to an inclined state, so that the tray can automatically flip and unload, thereby realizing the automatic unloading of the electronic scale and solving the problem of relying on manual unloading in the past. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 A schematic diagram of the structure of the electronic scale provided in this embodiment of the utility model;

[0034] Figure 2 This is a structural cross-sectional view of the electronic scale provided in an embodiment of the present utility model.

[0035] Among them, 1 is the tray, 2 is the hinge, 3 is the base, 4 is the scale body, 5 is the screw sleeve, 6 is the lead screw, 7 is the connecting rod, 8 is the hinge seat, 9 is the guide slope, 10 is the slide groove, 11 is the drive motor, 12 is the mounting groove, 13 is the side guard, and 14 is the rotating shaft. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] The electronic scale provided in this embodiment of the utility model, such as Figure 1 As shown, it includes: scale body 4, scale pan and drive assembly;

[0038] The weighing pan includes: a base 3 and a tray 1;

[0039] The base 3 is mounted on the scale body 4;

[0040] The tray 1 is set on the base 3 and can be flipped to an inclined state relative to the base 3 for unloading;

[0041] The drive assembly is used to drive tray 1 to tilt.

[0042] It should be noted that, as Figure 1 As shown, the base 3 can be installed and fixed on the weighing body 4, and the tray 1 can be placed flat on the base 3, that is, the tray 1 can be placed flat on the top surface of the base 3, and the tray 1 and the same side of the base 3 can be rotatably connected (hinged), so that the tray 1 can be flipped to an inclined state relative to the base 3 for unloading; wherein, when the tray 1 is on the base 3, it is in the flat state, and at this time the tray 1 can be used to load the material to be weighed, and the material is weighed by the weighing body 4; that is, the tray 1 has a switchable flat state and an inclined state, and in the flat state it can be used to load the material to be weighed, and in the inclined state it can be used to unload. In addition, the drive component is used to drive the tray 1 to tilt to achieve automatic unloading of the tray 1, thereby enabling automatic unloading of the electronic scale and solving the problem of relying on manual unloading. That is, there is no need to directly contact the weighing sample, which can reduce the risks in the unloading process, and also helps to improve efficiency even for continuous weighing. In addition, a storage container can be placed on one side of the tray 1 to store the unloaded material. Of course, this electronic scale can be used in the laboratory, that is, as a laboratory scale, and can also be used in other fields mentioned in the background art, which will not be elaborated here.

[0043] In other words, the electronic scale provided by this solution includes a base 3 and a tray 1. The base 3 is set on the scale body 4, and the tray 1 is placed on the base 3 and can be flipped to an inclined state relative to the base 3 for unloading. The drive component is used to drive the tray 1 to flip to an inclined state, so that the tray 1 can automatically flip and unload, thereby realizing the automatic unloading of the electronic scale and solving the problem of relying on manual unloading.

[0044] In this plan, such as Figure 1 As shown, the first side of the tray 1 is rotatably connected to the first side of the base 3, and the tray 1 can be flipped relative to the base 3 around the first horizontal direction.

[0045] The drive assembly is located between the base 3 and the tray 1, and is also used to drive the tray 1 back to a flat position so that the tray 1 is located on the base 3.

[0046] It should be noted that, as Figure 1As shown, tray 1 can be placed on the top surface of base 3. The first side (e.g., the right side) of tray 1 and the first side (e.g., the right side) of base 3 can be rotatably connected (hinged) via hinge 2, and tray 1 can be rotated relative to base 3 around a first horizontal direction; wherein, the first horizontal direction can be the length direction of the first side of base 3 (e.g., the front-back direction of base 3); in addition, as Figure 2 As shown, the drive component can be built into the space between the base 3 and the tray 1. In addition to driving the tray 1 to flip to the tilted state, it is also used to drive the tray 1 to rotate back to the flat state, so that the tray 1 is placed on the top surface of the base 3. That is to say, the drive component is used to drive the tray 1 to switch back and forth between the flat state and the tilted state. Moreover, the drive component is built into the space between the base 3 and the tray 1, avoiding the drive component being external to the electronic scale. This can help to make the overall structure of the electronic scale more compact and also help to reduce the size of the electronic scale. Of course, the drive component can be in the form of a telescopic component or a translation component + connector. For details, please see the description below.

[0047] Specifically, such as Figure 2 As shown, the top of the base 3 has a mounting groove 12;

[0048] The drive component is located within the mounting slot 12 of the base 3 and is capable of driving the tray 1 to switch between a flat and tilted state. For example, Figure 2 As shown, a mounting groove 12 can be provided in the middle part of the top (top surface) of the base 3 away from its first side; of course, the mounting groove 12 is also equivalent to a receiving groove, and can be a rectangular mounting groove with sufficient receiving space; in addition, the drive component can be set in the mounting groove 12 on the top of the base 3, and its drive end can drive the tray 1 to flip upward and rotate back to reset, so that the tray 1 can switch back and forth between the flat state and the tilted state, thereby realizing the automatic flipping and rotation reset of the tray 1; of course, the drive component is built into the mounting groove 12 on the top of the base 3, which can store the drive component, thus ensuring that the tray 1 can be placed flat on the top surface of the base 3, avoiding interference of the drive component with the flat state of the tray 1, and making the electronic scale structure more compact.

[0049] Furthermore, such as Figure 2 As shown, the drive assembly includes: a translation component and a link 7;

[0050] The translation component is disposed in the mounting groove 12 of the base 3 along the second horizontal direction, and its translation part is capable of moving along the second horizontal direction; wherein, the second horizontal direction is perpendicular to the first horizontal direction;

[0051] Link 7 is positioned above the translation component, with its first end rotatably connected to the translation part of the translation component and its second end rotatably connected to the bottom of the tray 1.

[0052] It should be noted that the first horizontal direction can be the front-to-back horizontal direction of the base 3, and the second horizontal direction can be the left-to-right horizontal direction of the base 3, and is perpendicular to the first horizontal direction; correspondingly, as... Figure 2 As shown, the mounting slots 12 are distributed horizontally on the top of the base 3; the translation component is disposed horizontally within the mounting slots 12 of the base 3, and its translation part (movable end) is correspondingly movable horizontally in the left and right directions; additionally, as Figure 2 As shown, the connecting rod 7 can be positioned above the translation component, and its downward projection can share the same vertical plane as the translation component. Its first end can be rotatably connected (hinged) to the top of the translation part of the translation component, and its second end can be rotatably connected (hinged) to the bottom of the tray 1. Thus, when the translation part of the translation component moves to the right, the connecting rod 7 acts as a support, thereby causing the tray 1 to flip upwards to an inclined state, or even automatically flip upwards to an inclined state. When the translation part of the translation component moves to the left, the connecting rod 7 acts as a pull rod, thereby causing the tray 1 to rotate downwards to return to a flat state, or even automatically rotate downwards to return to a flat state. In other words, the drive component adopts the aforementioned form of a translation component + connecting part, which provides convenient, reliable, and stable driving.

[0053] Furthermore, such as Figure 2 As shown, a groove 10 is provided on the bottom of the tray 1 along the second horizontal direction and is located above the mounting groove 12;

[0054] The drive assembly also includes a hinge mount 8;

[0055] The hinge seat 8 is slidably disposed in the groove 10 of the tray 1 and can slide along the second horizontal direction;

[0056] The second end of the connecting rod 7 is hinged to the hinge seat 8.

[0057] Among them, such as Figure 2 As shown, a groove 10 can be formed on the bottom (bottom surface) of the tray 1 along the second horizontal direction, and can be located above the first side end of the mounting groove 12, and the length of the groove 10 needs to be reasonably set; wherein, the first side end of the mounting groove 12 is close to the first side edge of the base 3; in addition, the hinge seat 8 can be slidably disposed on the groove 10 at the bottom of the tray 1, and can slide along the second horizontal direction, of course, the hinge seat 8 will not detach from the groove 10; for this purpose, the hinge seat 8 can adopt a T-shaped structure, and its upper horizontal part can be slidably disposed in the groove 10 of the tray 1; furthermore, as Figure 2 As shown, the second end of the connecting rod 7 can be hinged to the bottom of the hinge seat 8; of course, this design provides a certain amount of free movement space for the second end of the connecting rod 7 to avoid interference and jamming of the drive component structure, and also ensures smooth drive of the drive component.

[0058] In this plan, such as Figure 2 As shown, when the tray 1 is in a flat position, the hinge seat 8 is located at the first end of the slide 10, and the connecting rod 7 is parallel to the translation assembly and located in the mounting groove 12; wherein, the first end of the slide 10 is away from the first side of the tray 1.

[0059] It should be noted that, as Figure 2 As shown, the base 3 has sufficient thickness to provide sufficient depth or accommodating space for its mounting groove 12, so as to better accommodate the aforementioned drive components; wherein, as Figure 2 As shown, when the tray 1 is in a flat position, the hinge seat 8 can be located at the left end of the slide groove 10, the connecting rod 7 is above the translation component and parallel to the translation component, and is located in the mounting groove 12; of course, this design allows the drive component to be completely stored in the mounting groove 12 of the base 3 when the tray 1 is in a flat position, thereby ensuring that the tray 1 can be placed flat on the top surface of the base 3.

[0060] Specifically, such as Figure 2 As shown, the second end of the connecting rod 7 is hinged to the hinge seat 8 via the rotating shaft 14, and both ends of the rotating shaft extend out of both sides of the hinge seat 8.

[0061] like Figure 2 As shown, the mounting groove 12 is provided with a guide slope 9 that is inclined toward the first side of the base 3 and is located below the slide groove 10 of the tray 1; wherein, when the tray 1 is in a flat state, both ends of the rotating shaft are in contact with the guide slope 9.

[0062] It should be noted that, as mentioned above, the hinge seat 8 can be a T-shaped structure, and its vertical part can have two parallel hinge ears; the second end of the connecting rod 7 can be installed between the two hinge ears of the hinge seat 8, and hinged to the two hinge ears through the rotating shaft 14, with both ends of the rotating shaft 14 extending outwards from the two hinge ears; in addition, as Figure 2 As shown, the mounting groove 12 may be provided with a guide slope 9 inclined towards the right side of the base 3, and may be located below the first end of the slide groove 10, that is, below the hinge seat 8 located at the first end of the slide groove 10; wherein, the guide slope 9 may be lower on the left and higher on the right, and during the sliding process of the hinge seat 8, in order to avoid interference between the two hinge ears of the hinge seat 8 and the guide slope 9, the middle part of the guide slope 9 corresponding to the two hinge ears may be a hollow structure; that is, as Figure 2As shown, when the tray 1 is in a flat position, both ends of the rotating shaft are actually in contact with both sides of the guide slope 9. In this way, when the tray 1 is switched from a flat position to an inclined position, both ends of the rotating shaft will slide upward along both sides of the guide slope 9. Based on the guiding effect of the contact between the two ends of the rotating shaft and both sides of the guide slope 9, it is easier for the connecting rod 7 to better lift the bottom of the tray 1, which also makes it easier to achieve a smooth upward flip of the tray 1. When the tray 1 is about to switch from an inclined position to a flat position, both ends of the rotating shaft will slide downward along both sides of the guide slope 9. Based on the guiding effect of the contact between the two ends of the rotating shaft and both sides of the guide slope 9, it is easier for the connecting rod 7 to smoothly pull back the bottom of the tray 1, which also makes it easier to achieve a smooth return of the tray 1 to a flat position.

[0063] In other words, based on the contact guidance between the two ends of the rotating shaft and the two sides of the guide slope 9, when the translation part of the translation component moves from the leftmost position to the right, the second end of the connecting rod 7 and the hinge seat 8 can generate a certain swing angle under this action, thereby effectively lifting the tray 1; in addition, when the translation part of the translation component is about to move to the leftmost position, the second end of the connecting rod 7 and the hinge seat 8 can slide down smoothly under this action, thereby helping to achieve the smooth reset of the tray 1; of course, the tray 1 falling back to the top surface of the base 3 can greatly reduce the occupation of vertical space, which is conducive to the overall compact design and reduces the volume.

[0064] Furthermore, the translation component includes a lead screw assembly. The lead screw assembly is equipped with a reversible drive motor to enable the back-and-forth movement of its movable part. Of course, the use of a lead screw assembly as the translation component in this solution also offers advantages such as simple structure, smooth translation, and reliability.

[0065] Furthermore, such as Figure 2 As shown, the lead screw assembly includes: a lead screw 6, a screw sleeve 5, and a drive motor 11;

[0066] The lead screw 6 is rotatably mounted in the mounting groove 12 and is distributed along the second horizontal direction;

[0067] The threaded sleeve 5 is fitted onto the lead screw 6, and its bottom is in planar contact with the bottom of the mounting groove 12;

[0068] The drive motor 11 is installed in the mounting slot 12, and its output end is connected to one end of the lead screw 6 for transmission.

[0069] The first end of the connecting rod 7 is rotatably connected to the top of the threaded sleeve 5.

[0070] It should be noted that, as Figure 2As shown, the lead screw 6 is rotatably mounted in the mounting groove 12 along the second horizontal direction; wherein, the first end (such as the left end) of the lead screw 6 is mounted in the left end wall of the mounting groove 12 via a bearing, and the second end is mounted through the rotating seat; the threaded sleeve 5 can be sleeved on the middle part of the lead screw 6, and its bottom can be a flat structure and contact the bottom of the mounting groove 12, thus preventing the threaded sleeve 5 from rotating; of course, the threaded sleeve 5 can slide along the bottom of the mounting groove 12; wherein, when the tray 1 is in a flat state, the threaded sleeve 5 can be adjacent to the first end of the lead screw 6, and the threaded sleeve 5 can serve as the translation part of the aforementioned translation component; the drive motor 11 can be mounted on the right end of the mounting groove 12, and its output end can be connected to the second end of the lead screw 6 for transmission, and can be used to drive the lead screw 6 to rotate forward and backward, thereby realizing the back-and-forth movement of the threaded sleeve 5, from The drive motor 11 can rotate the tray 1 upwards and back to its original position. The top of the threaded sleeve 5 can have two parallel hinge ears. The first end of the connecting rod 7 can be mounted on the two hinge ears on the top of the threaded sleeve 5, and can be hinged to the two hinge ears of the threaded sleeve 5 via another rotating shaft. Furthermore, to avoid interference between the guide slope 9 and the lead screw 6, the guide slope 9 can be respectively set on the front and rear side walls of the mounting groove 12. Additionally, when the drive motor 11 drives the lead screw 6 to rotate, thereby driving the threaded sleeve 5 to move to the right, the connecting rod 7 acts as a support rod, causing the tray 1 to rotate upwards to an inclined state. When the drive motor 11 drives the lead screw 6 to rotate in the opposite direction, thereby driving the threaded sleeve 5 to move to the left, the connecting rod 7 acts as a pull rod, causing the tray 1 to rotate downwards back to its original position.

[0071] In this plan, such as Figure 1 As shown, pallet 1 has a rectangular structure, and its second, third, and fourth sides are all provided with upward-curving guard edges 13. This allows the material on pallet 1 to be unloaded from its first side when it is tilted, thus facilitating unloading from its lower side; of course, as... Figure 1 As shown, the base 3 can also be a rectangular structure.

[0072] In other words, the electronic scale provided in this solution can be used as a laboratory electronic scale. The base and tray of the electronic scale are hinged, and the tray is driven to switch between a flat and tilted state through a lead screw assembly and a connecting rod. The end of the connecting rod away from the lead screw assembly is slidably connected to the tray, thereby ensuring that the tray flips smoothly, reliably, and smoothly. In addition, the lead screw assembly is built into the mounting groove on the base, and when the tray is in the flat state, the connecting rod and the hinge seat are also stored in the mounting groove. This enables the built-in design of the drive component, avoiding the drive component being exposed on the electronic scale, and also makes the structure of this electronic scale compact.

[0073] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0074] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electronic scale, characterized in that, include: The weighing body (4), the weighing pan, and the drive assembly; The weighing pan includes: a base (3) and a tray (1); The base (3) is disposed on the scale body (4); The tray (1) is disposed on the base (3) and can be flipped to an inclined state relative to the base (3) for unloading; The drive assembly is used to drive the tray (1) to flip to the tilted state.

2. The electronic scale according to claim 1, characterized in that, The first side of the tray (1) is rotatably connected to the first side of the base (3), and the tray (1) can be flipped relative to the base (3) around the first horizontal direction; The drive component is disposed between the base (3) and the tray (1), and is also used to drive the tray (1) to reset to a flat state, so that the tray (1) is located on the base (3).

3. The electronic scale according to claim 2, characterized in that, The top of the base (3) is provided with a mounting groove (12); The drive component is disposed in the mounting slot (12) of the base (3) and is capable of driving the tray (1) to switch back and forth between the flat state and the tilted state.

4. The electronic scale according to claim 3, characterized in that, The drive assembly includes: a translation component and a link (7); The translation component is disposed in the mounting groove (12) of the base (3) along the second horizontal direction, and its translation part is capable of moving along the second horizontal direction; wherein, the second horizontal direction is perpendicular to the first horizontal direction; The connecting rod (7) is positioned above the translation component, with its first end rotatably connected to the translation part of the translation component and its second end rotatably connected to the bottom of the tray (1).

5. The electronic scale according to claim 4, characterized in that, The bottom of the tray (1) is provided with a groove (10) along the second horizontal direction and is located above the mounting groove (12); The drive assembly also includes a hinged base (8). The hinge seat (8) is slidably disposed in the groove (10) of the tray (1) and can slide along the second horizontal direction; The second end of the connecting rod (7) is hinged to the hinge seat (8).

6. The electronic scale according to claim 5, characterized in that, When the tray (1) is in the flat position, the hinge seat (8) is located at the first end of the slide (10), and the connecting rod (7) is parallel to the translation assembly and located in the mounting groove (12); wherein the first end of the slide (10) is away from the first side of the tray (1).

7. The electronic scale according to claim 6, characterized in that, The second end of the connecting rod (7) is hinged to the hinge seat (8) via a rotating shaft (14), and both ends of the rotating shaft (14) extend out of both sides of the hinge seat (8). The mounting groove (12) is provided with a guide slope (9) that is inclined toward the first side of the base (3) and is located below the slide groove (10) of the tray (1); wherein, when the tray (1) is in the flat state, both ends of the rotating shaft are in contact with the guide slope (9).

8. The electronic scale according to claim 4, characterized in that, The translation component includes a lead screw assembly.

9. The electronic scale according to claim 8, characterized in that, The lead screw assembly includes: a lead screw (6), a screw sleeve (5), and a drive motor (11). The lead screw (6) is rotatably disposed in the mounting groove (12) and distributed along the second horizontal direction; The screw sleeve (5) is fitted onto the lead screw (6), and its bottom is in planar contact with the bottom of the mounting groove (12); The drive motor (11) is disposed in the mounting slot (12), and its output end is connected to one end of the lead screw (6) for transmission. The first end of the connecting rod (7) is rotatably connected to the top of the threaded sleeve (5).

10. The electronic scale according to claim 2, characterized in that, The tray (1) has a rectangular structure, and its second, third and fourth sides are provided with upward-curving guard edges (13).

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