CN116106218A - Biochemical detector - Google Patents

Abstract

The invention provides a biochemical detector. The biochemical detector comprises a machine body, a bracket assembly, a microfluidic disc and a driving piece. Wherein, the machine body is provided with a containing bin; the bracket component is provided with a containing position contained in the containing bin and a discharging position positioned outside the containing bin, and comprises a frame body and a tray, and the tray is rotatably arranged on the frame body; the microfluidic disc is detachably arranged on the tray; the driving piece is fixedly arranged on the frame body and is directly connected with the tray in a driving way. When the driving piece drives the tray to rotate, the driving power of the driving piece can be directly transmitted to the tray, even if the bracket component reciprocates between the accommodating position and the delivering position for a long time, the matching precision between the driving piece and the tray is not easily affected, the matching displacement between the driving piece and the tray is not easily generated, the control precision of the driving piece on the tray and the microfluidic disc arranged on the tray can be improved, and the detection precision of the biochemical detector can be further improved.

Description

Biochemical detector

Technical Field

The invention relates to the technical field of medical instruments, in particular to a biochemical detector.

Background

Biochemical detectors, also commonly referred to as biochemicals, are devices that use the principle of optoelectric colorimetry to measure a specific chemical composition in a body fluid. Because of the rapid measurement speed, high accuracy and small consumption of reagents, the method is widely used in hospitals, epidemic prevention stations and family planning service stations at all levels, and can greatly improve the efficiency of conventional biochemical tests.

In the prior art, for example, in CN112504964, a driving structure for driving a tray to rotate is separately arranged between the driving member, when the tray is pulled out and placed with a microfluidic disc and pushed into the instrument, the situation that the driving member is not in tight contact with the tray or is connected with the tray to shift easily occurs, at this time, when the driving member drives the tray to rotate, the actual rotation angle and the design rotation angle of the microfluidic disc deviate, and further the accuracy of the biochemical detection result is affected.

Disclosure of Invention

The invention mainly aims to provide a biochemical detector so as to solve the problem that the detection result of the biochemical detector in the prior art is not accurate enough.

In order to achieve the above object, the present invention provides a biochemical detector comprising:

the machine body is provided with a containing bin;

the bracket assembly is provided with a containing position contained in the containing bin and a discharging position positioned outside the containing bin, and comprises a bracket body and a tray, wherein the tray is rotatably arranged on the bracket body;

the microfluidic disc is detachably arranged on the tray; and

the driving piece is fixedly arranged on the frame body and is directly connected with the tray in a driving way.

Further, a avoidance hole is formed in the frame body, the driving piece is a driving motor, and an output shaft of the driving motor penetrates through the avoidance hole and is in direct driving connection with the tray.

Further, a non-circular hole is formed in the center of the tray, a non-cylindrical section is arranged on an output shaft of the driving motor, and the non-cylindrical section is matched with the non-circular hole and is spliced with the non-circular hole.

Further, the biochemical detector further includes:

the bracket assembly is connected with the machine body through the sliding rail assembly and is slidably arranged on the sliding rail assembly; and

the driving mechanism is in driving connection with the bracket assembly or the driving piece to drive the bracket assembly to slide along the sliding rail assembly so as to switch between the accommodating position and the unloading position.

Further, the slide rail assembly includes:

the first sliding rail is fixedly arranged on the machine body and is provided with a first sliding groove;

the second sliding rail is fixedly arranged on the bracket assembly, and a second sliding groove is formed in the second sliding rail; and

the connecting sliding block is connected between the first sliding rail and the second sliding rail and can slide along the first sliding groove and the second sliding groove.

Further, the driving mechanism comprises a motor and a screw rod, the motor is fixedly arranged on the machine body and is in driving connection with the screw rod, and the screw rod is connected with the driving piece or the bracket component through a sliding block; or alternatively, the process may be performed,

the driving mechanism comprises a motor, a worm and a turbine, wherein the motor is fixedly arranged on the machine body and is in driving connection with the worm, and the worm is connected with the driving piece or the bracket component through the turbine.

Further, the biochemical detector further comprises a position detection element and a controller, wherein the position detection element and the driving mechanism are electrically connected with the controller, and the controller controls the driving mechanism according to signals transmitted by the position detection element.

Further, a limiting part is arranged on the tray, and a limiting matching part matched with the limiting part is arranged on the microfluidic disc.

Further, a groove is formed in the tray and is matched with the microfluidic disc, the limiting part is arranged on the side wall of the groove, and the limiting matching part is arranged at the outer edge of the microfluidic disc.

Further, the biochemical detector further comprises a heating assembly, the heating assembly comprises a first heating plate and a second heating plate, the first heating plate is arranged on the frame body and located at the bottom of the tray, and the second heating plate is arranged above the tray through a support frame.

By applying the technical scheme of the invention, the driving piece is fixedly arranged on the frame body, and can synchronously move along with the bracket assembly in the moving process of the bracket assembly, meanwhile, as the driving piece is directly connected with the tray in a driving way, namely, no other transmission part exists between the driving piece and the tray, when the driving piece drives the tray to rotate, the driving power of the driving piece can be directly transmitted to the tray, even if the bracket assembly reciprocates between the accommodating position and the delivering position for a long time, the matching precision between the driving piece and the tray is not easily influenced, the matching displacement between the driving piece and the tray is not easily generated, and the control precision of the driving piece on the tray and the microfluidic disc arranged on the tray can be improved, so that the detection precision of the biochemical detector can be improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:

FIG. 1 is a block diagram of a biochemical detector according to an embodiment of the present invention;

FIG. 2 is a block diagram of the biochemical detector according to the embodiment of the present invention after removing a part of the body;

FIG. 3 is a block diagram of a portion of a carriage assembly of a biochemical detector in accordance with an embodiment of the present invention in a first view;

FIG. 4 is a first exploded view of FIG. 3;

FIG. 5 is a second exploded view of FIG. 3;

FIG. 6 is a block diagram of a portion of a carriage assembly of a biochemical detector in accordance with an embodiment of the present invention in a second view;

fig. 7 is a front view of fig. 6;

FIG. 8 is a top view of FIG. 6 (bracket assembly in the off-warehouse position);

FIG. 9 is a top view of FIG. 6 (bracket assembly in a stowed position);

FIG. 10 is a block diagram of a biochemical detector of the present invention after a bracket assembly is partially cut away;

fig. 11 is an enlarged view of the M region in fig. 10.

Wherein the above figures include the following reference numerals:

100. a biochemical detector; 10. a body; 11. a storage bin; 20. a bracket assembly; 21. a frame body; 211. a clearance hole; 22. a tray; 221. a non-circular aperture; 222. a limit part; 223. a groove; 201. a detection sheet; 30. a microfluidic disc; 31. a limit matching part; 40. a driving member; 41. a non-cylindrical section; 50. a slide rail assembly; 51. a first slide rail; 511. a first chute; 52. a second slide rail; 521. a second chute; 53. the connecting slide block; 60. a driving mechanism; 61. a motor; 62. a screw rod; 63. a slide block; 70. A position detecting element; 81. a first heating plate; 82. a second heating plate; 90. a bracket; 91. a diluent bottle; 92. and a heat conducting pressing plate.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

Referring to fig. 1 to 4, according to an embodiment of the present invention, there is provided a biochemical detector 100, the biochemical detector 100 including a body 10, a bracket assembly 20, a microfluidic disc 30, and a driving member 40.

Wherein, the machine body 10 is provided with a containing bin 11; the bracket assembly 20 has a storage position (see fig. 3, 4, 5, 6 and 7) stored in the storage bin 11 and a discharge position (see fig. 8) located outside the storage bin 11, the bracket assembly 20 includes a frame 21 and a tray 22, and the tray 22 is rotatably disposed on the frame 21; microfluidic disc 30 is removably placed on tray 22 for testing samples; the driving member 40 is fixedly disposed on the frame 21 and is directly connected with the tray 22.

Because the driving member 40 in this embodiment is fixedly disposed on the frame 21, when the bracket assembly 20 moves, the driving member 40 can move synchronously with the bracket assembly 20, meanwhile, because the driving member 40 is directly connected with the tray 22, i.e. there is no other transmission component between the two, when the driving member 40 drives the tray 22 to rotate, the driving force of the driving member 40 can be directly transmitted to the tray 22, even if the bracket assembly 20 reciprocates between the accommodating position and the delivering position for a long time, the matching precision between the driving member 40 and the tray 22 is not easily affected, the matching displacement between the driving member 40 and the tray 22 is not easily generated, the control precision of the driving member 40 on the tray 22 and the microfluidic disc 30 disposed on the tray 22 can be improved, and the detection precision of the biochemical detector 100 in the invention can be improved.

In one embodiment of the present invention, the driving member 40 is configured as a driving motor, and the driving motor may be fixed on the frame 21 by means of screws, bolts, welding, etc., specifically fixed on the bottom of the frame 21, in order to enable the driving motor to be directly connected with the tray 22 in a driving manner, in this embodiment, the frame 21 is provided with a avoidance hole 211, and during assembly, an output shaft of the driving motor passes through the avoidance hole 211 to be directly connected with the tray 22 in a driving manner, which is simple in structure and convenient to implement.

Referring to fig. 3 and 5, in order to further improve the detection accuracy of the biochemical detector 100 in this embodiment, a limiting portion 222 is disposed on the tray 22, a limiting matching portion 31 adapted to the limiting portion 222 is disposed on the microfluidic disc 30, and the microfluidic disc 30 is conveniently limited on the tray 22 through the interaction of the limiting portion 222 and the limiting matching portion 31, so, when the driving member 40 drives the tray 22 to rotate, the microfluidic disc 30 can be driven to synchronously rotate, so that the samples in the microfluidic disc 30 can be conveniently separated and the freeze-dried reagent in the microfluidic disc 30 can be fully reacted with the samples.

Specifically, the tray 22 is provided with a groove 223, the groove 223 is matched with the microfluidic disc 30, the limiting part 222 is arranged on the side wall of the groove 223, and the outer edge of the microfluidic disc 30 is provided with a limiting matching part 31, so that the structure is simple, and the microfluidic disc 30 is convenient to limit. Alternatively, in the present embodiment, one of the limiting portion 222 and the limiting mating portion 31 is a limiting groove, and the other is a limiting protrusion, in the present embodiment, the limiting portion 222 is a limiting protrusion, and the limiting mating portion 31 is a limiting groove.

Referring to fig. 3 to 5, a non-circular hole 221 is provided at the center of the tray 22 in this embodiment, a non-cylindrical section 41 is provided on the output shaft of the driving motor, the non-cylindrical section 41 is adapted to the non-circular hole 221 and is inserted into the non-circular hole 221, when the driving motor works, the output shaft of the driving motor rotates, so that the tray 22 and the microfluidic disc 30 placed on the tray 22 can be directly driven to rotate, and the detection precision of the biochemical detector 100 can be improved.

Referring to fig. 1 to 6, the machine body 10 in the present embodiment has a generally cylindrical structure, the bottom of the machine body 10 encloses the housing 11, and the bracket assembly 20 is slidably disposed on the machine body 10 to switch between the housing position and the unloading position. In order to switch the bracket assembly 20 between the storage position and the unloading position, the biochemical analyzer 100 in the present embodiment further includes a slide rail assembly 50 and a driving mechanism 60, wherein the bracket assembly 20 is connected to the machine body 10 through the slide rail assembly 50, and the bracket assembly 20 is slidably disposed on the slide rail assembly 50; the drive mechanism 60 is drivingly coupled to the carriage assembly 20 or the drive member 40 to slide the carriage assembly 20 along the slide rail assembly 50 to switch between the storage position and the ejection position. In actual installation, the driving mechanism 60 is fixed inside the accommodating bin 11, and the driving mechanism 60 can be in driving connection with the bracket assembly 20 or in driving connection with the driving piece 40, so long as the bracket assembly 20 and the driving piece 40 can be driven to synchronously move.

Referring to fig. 5 to 9, the slide rail assembly 50 in the present embodiment includes a first slide rail 51, a second slide rail 52, and a connecting slider 53. The first sliding rail 51 is fixedly arranged on the machine body 10, specifically on the side wall of the accommodating bin 11, and the first sliding rail 51 is provided with a first sliding groove 511; the second sliding rail 52 is fixedly arranged on the bracket assembly 20, in particular on the frame body 21, and a second sliding chute 521 is arranged on the second sliding rail 52; the connecting slider 53 is connected between the first slide rail 51 and the second slide rail 52, and the connecting slider 53 can slide along the first slide groove 511 and the second slide groove 521. When the driving mechanism 60 drives the bracket assembly 20 to slide, the connecting slider 53 can be driven to slide along the first chute 511 or the second chute 521, so as to switch between the unloading position and the storing position.

It can be appreciated that the sliding rail assembly 50 is configured as the first sliding rail 51, the second sliding rail 52 and the connecting sliding block 53, and the connecting sliding block 53 is made to slide along the first sliding groove 511 and the second sliding groove 521, so that the overall travel of the bracket assembly 20 is equal to the sum of the lengths of the first sliding rail 51 and the second sliding rail 52, which is convenient for implementing the miniaturized design of the biochemical detector 100. Of course, in other embodiments of the present invention, the slide rail assembly 50 may be configured by a structure in which one slide rail and one slide block are matched, and any other modification forms within the scope of the present invention are within the scope of the present invention.

Alternatively, the number of the slide rail assemblies 50 may be one, or two or more, and the case where the number of the slide rail assemblies 50 is two is shown in the drawings in this embodiment. The two sliding rail assemblies 50 are respectively disposed at two opposite sides of the bracket assembly 20, so as to improve stability of the bracket assembly 20 during movement.

In one embodiment of the present invention, the driving mechanism 60 includes a motor 61 and a screw 62, the motor 61 is fixedly disposed on the machine body 10 and is in driving connection with the screw 62, the screw 62 is connected with the driving member 40 or the bracket assembly 20 through a sliding block 63, that is, the sliding block 63 may be disposed on the driving member 40 or may be disposed on the bracket assembly 20, the motor 61 drives the screw 62 to rotate, and may drive the sliding block 63 and the bracket assembly 20 connected with the sliding block 63 and the driving member 40 to synchronously slide along the sliding rail assembly 50.

In an embodiment of the present invention, the driving mechanism 60 includes a motor 61, a worm and a worm wheel, the motor 61 is fixedly disposed on the machine body 10 and is in driving connection with the worm, the worm is connected with the driving member 40 or the bracket assembly 20 through the worm wheel, that is, the worm wheel may be disposed on the driving member 40 or may be disposed on the bracket assembly 20, the motor 61 drives the worm to rotate, and the worm wheel, the bracket assembly 20 connected with the worm wheel and the driving member 40 may be driven to synchronously slide along the sliding rail assembly 50, which has a simple structure and high control precision.

Further, the biochemical analyzer 100 of the present invention further comprises a position detecting element 70 and a controller (not shown), wherein the position detecting element 70 and the driving mechanism 60 are electrically connected to the controller, and the controller controls the driving mechanism 60 according to signals transmitted by the position detecting element 70.

Alternatively, the position detecting element 70 in the present embodiment may be provided as a photoelectric switch provided at an outer edge of the housing compartment 11, and the tray assembly 20 is provided with a detecting piece 201 corresponding to the photoelectric switch. When the driving mechanism 60 drives the bracket assembly 20 to move to the unloading position, the detection sheet 201 moves to the photoelectric switch, the photoelectric switch transmits a signal detected by the bracket assembly 20 to the controller, and the controller controls the driving mechanism 60 to stop working until medical staff places the microfluidic disc 30 on the tray 22 or controls the driving mechanism 60 to move again by using the controller according to the use requirement so as to enable the bracket assembly 20 to slide back into the accommodating bin 11. When the photoelectric switch does not detect the detecting sheet 201, the controller can control the driving mechanism 60 to work according to the requirement until the photoelectric switch detects the detecting sheet 201. Of course, the control manner between the controller and the driving mechanism 60 is not limited to that described in the present embodiment, and may be specifically designed and adjusted according to actual use and detection requirements, and the present invention is not limited thereto.

Referring to fig. 2 and 9 to 11, the biochemical detector 100 according to the present invention further includes a heating assembly including a first heating plate 81 and a second heating plate 82, wherein the first heating plate 81 is fixedly disposed on the frame 21 and is located at the bottom of the tray 22, and the second heating plate 82 is disposed above the tray 22. In practical use, the first heating plate 81 and the second heating plate 82 can release heat from the top and the bottom of the microfluidic disc 30 respectively, so as to heat the sample in the microfluidic disc 30, thus improving the heating rate of the heating assembly on the sample, and further improving the detection efficiency of the biochemical detector 100.

Specifically, in order to set the second heating sheet 82 above the tray 22, the biochemical detector 100 in the present embodiment is further provided with a bracket 90, the bracket 90 is disposed above the tray, the second heating sheet 82 is disposed at the bottom of the bracket 90, that is, near one side of the tray, and the second heating sheet 82 is fixed to the bracket 90 by a heat conductive pressing plate 92. Alternatively, the heat conductive platen 92 in this embodiment may be, for example, an aluminum platen, which has a high heat transfer coefficient and a small heat loss, so as to transfer the heat released from the second heating sheet 82 to the side close to the tray 22. Of course, in other embodiments of the present invention, the heat conductive platen 92 may be made of other materials with higher thermal conductivity, such as copper, silicon, etc.

Further, the biochemical detector 100 further includes a diluent bottle 91, and the diluent bottle 91 is disposed on the stand 90 for adding the diluent to the microfluidic disc 30. When the biochemical detection instrument 100 in this embodiment is used for biochemical detection, firstly, the microfluidic disc 30 is placed on the tray 22, then a sample to be detected is injected into the microfluidic disc 30, then, a diluent bottle 91 is used for adding diluent to the microfluidic disc 30, so that a freeze-dried reagent ball pre-packaged in the microfluidic disc 30 can be diluted, then, the tray 22 and the microfluidic disc 30 placed on the tray 22 are driven by the driving member 40 to rotate, so that the sample contained in the microfluidic disc 30 can be separated and reacted with the reagent, and finally, the sample can be detected by using a light source and a detector (not shown in the figure) pre-mounted on the biochemical detection instrument 100.

In summary, since the driving member 40 is fixedly disposed on the frame 21, the driving member 40 can move synchronously with the frame 20 during the movement of the frame 20, and meanwhile, since the driving member 40 is directly connected with the tray 22, i.e. no other transmission component is disposed between the driving member 40 and the tray 22, when the driving member 40 drives the tray 22 to rotate, the driving force of the driving member 40 can be directly transmitted to the tray 22, even if the frame 20 reciprocates between the accommodating position and the delivering position for a long time, the matching precision between the driving member 40 and the tray 22 is not easily affected, the matching displacement between the driving member 40 and the tray 22 is not easily occurred, the control precision of the driving member 40 on the tray 22 and the microfluidic disc 30 disposed on the tray 22 can be improved, and the detection precision of the biochemical detector 100 in the invention can be improved.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A biochemical detector, comprising:

a machine body (10), wherein a containing bin (11) is arranged on the machine body (10);

a bracket assembly (20), wherein the bracket assembly (20) is provided with a containing position contained in the containing bin (11) and a discharging position positioned outside the containing bin (11), the bracket assembly (20) comprises a frame body (21) and a tray (22), and the tray (22) is rotatably arranged on the frame body (21);

a microfluidic disc (30), the microfluidic disc (30) being detachably mounted to the tray (22); and

the driving piece (40), the driving piece (40) is fixedly arranged on the frame body (21) and is directly connected with the tray (22) in a driving way.

2. The biochemical detector according to claim 1, wherein a avoidance hole (211) is provided on the frame body (21), the driving member (40) is a driving motor, and an output shaft of the driving motor passes through the avoidance hole (211) and is directly in driving connection with the tray (22).

3. The biochemical detector according to claim 2, wherein a non-circular hole (221) is arranged at the central position of the tray (22), a non-cylindrical section (41) is arranged on the output shaft of the driving motor, and the non-cylindrical section (41) is matched with the non-circular hole (221) and is spliced with the non-circular hole (221).

4. The biochemical detector according to claim 1, further comprising:

the bracket assembly (20) is connected with the machine body (10) through the sliding rail assembly (50), and the bracket assembly (20) is slidably arranged on the sliding rail assembly (50); and

the driving mechanism (60) is in driving connection with the bracket assembly (20) or the driving piece (40) so as to drive the bracket assembly (20) to slide along the sliding rail assembly (50) to switch between the accommodating position and the unloading position.

5. The biochemical detector according to claim 4, wherein the slide rail assembly (50) comprises:

the first sliding rail (51), the first sliding rail (51) is fixedly arranged on the machine body (10), and a first sliding groove (511) is formed in the first sliding rail (51);

the second sliding rail (52), the second sliding rail (52) is fixedly arranged on the bracket assembly (20), and a second sliding groove (521) is arranged on the second sliding rail (52); and

the connecting sliding block (53), the connecting sliding block (53) is connected between the first sliding rail (51) and the second sliding rail (52), and the connecting sliding block (53) can slide along the first sliding groove (511) and the second sliding groove (521).

6. The biochemical detector according to claim 4, wherein the driving mechanism (60) comprises a motor (61) and a screw (62), the motor (61) is fixedly arranged on the machine body (10) and is in driving connection with the screw (62), and the screw (62) is connected with the driving piece (40) or the bracket assembly (20) through a sliding block (63); or alternatively, the process may be performed,

the driving mechanism (60) comprises a motor (61), a worm and a turbine, the motor (61) is fixedly arranged on the machine body (10) and is in driving connection with the worm, and the worm is connected with the driving piece (40) or the bracket assembly (20) through the turbine.

7. The biochemical detector according to claim 4, further comprising a position detection element (70) and a controller, wherein the position detection element (70) and the driving mechanism (60) are electrically connected to the controller, and the controller controls the driving mechanism (60) according to a signal transmitted from the position detection element (70).

8. The biochemical detector according to any one of claims 1 to 7, characterized in that a limit part (222) is provided on the tray (22), and a limit matching part (31) adapted to the limit part (222) is provided on the microfluidic disc (30).

9. The biochemical detector according to claim 8, wherein a groove (223) is provided on the tray (22), the groove (223) is adapted to the microfluidic disc (30), the limiting portion (222) is provided on a side wall of the groove (223), and the limiting matching portion (31) is provided at an outer edge of the microfluidic disc (30).

10. The biochemical detector according to any one of claims 1 to 7, further comprising a heating assembly, the heating assembly comprising a first heating plate (81) and a second heating plate (82), the first heating plate (81) being arranged in the frame (21) and being located at the bottom of the tray (22), the second heating plate (82) being arranged above the tray (22) by a bracket (90).

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