Microwave digestion device for food detection

Abstract

The utility model discloses a microwave digestion device for food detection and relates to the technical field of food detection. A suspension is fixed at the top in the digestion chamber, an inner gear ring is horizontally fixed at the lower end of the suspension, the digestion tank shaking support comprises a rotating cap, a digestion tank carrying disc and an assembly connecting rod, the rotating cap covers the rotating driving head, an eccentric groove is formed in the side of the rotating cap, the digestion tank carrying disc is obliquely arranged, and a shaft rod is arranged on the lower surface of the digestion tank carrying disc and rotationally inserted into the eccentric groove; the assembly connecting rod is coaxially arranged at the top of the digestion tank carrying disc, the top end is connected with the upper end of the suspension through a spherical hinge, the bottom end is provided with an elastic connecting plug which is detachably connected with a transmission connecting groove preset in the digestion tank carrying disc, and the middle section of the assembly connecting rod is provided with rolling teeth meshed with the inner gear ring. The digestion tank shake-up support is in an inclined form, the top of the digestion tank shake-up support is connected through a spherical hinge, the digestion tank carrying disc rotates in a conical surface and rotates at the same time, and effective shake-up action can be carried out so as to improve the digestion efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of food detection, in particular to a microwave digestion device for food detection. Background Art

[0002] Microwave digestion instrument is a commonly used testing instrument in the field of food testing. It uses non-pulse continuous automatic frequency control of microwaves and the principle of microwave heating under high-pressure conditions to achieve safe dissolution and digestion of samples. It not only helps to speed up the digestion process of samples, but also provides accurate and reliable data support for subsequent experiments, helping to improve the accuracy of analysis results.

[0003] The operating steps of the microwave digestion method are recorded in the national food safety standard GB5009.15-2023, which requires that 0.2g to 3g (accurate to 0.001g) of solid samples be weighed into a microwave digestion tank and 5mL to 10mL of nitric acid be added. However, for powdery materials such as rice flour and flour, agglomeration and caking will occur after adding nitric acid. The current microwave digestion instrument is equipped with a cylindrical digestion tank holder in the digestion chamber. The digestion tank is inserted into the edge of the digestion tank holder, and then the digestion tank holder is placed on the rotating drive head at the bottom of the digestion chamber. After setting the parameters, the rotating drive head drives the digestion tank holder to rotate slowly so that the sample in the digestion tank is heated evenly. However, the traditional rotation method of the digestion tank holder is not conducive to the dispersion of agglomerated samples in the digestion tank. Sometimes after one digestion is completed, the digestion is still incomplete and there is a residue left. Nitric acid needs to be added for digestion again, which is time-consuming and labor-intensive. If the digestion tank is shaken before digestion, the lumps cannot be dissolved because it has not been heated. If a glass rod is used for stirring, the sample will adhere to the glass rod, which may easily cause errors or introduce other impurities.

[0004] Therefore, there is an urgent need to optimize and improve the microwave digestion instrument so that it can accelerate the dispersion of agglomerated samples to improve digestion efficiency and performance. The Chinese utility model patent with announcement number CN219798953U, announcement date October 3, 2023, and name is a high-efficiency microwave digestion instrument that is convenient for sample removal and placement. The microwave digestion instrument door is designed to be push-pull type to facilitate the placement of the digestion tank bracket, and the digestion tank bracket is designed to be able to realize the rotation of the digestion tank while the overall revolution is in progress. This method further enhances the heating uniformity of the digestion tank and improves the heating efficiency. However, the rotation of the digestion tank does not produce a more obvious shaking effect on the sample inside it, so for agglomerated samples, it is still difficult to effectively accelerate the dissolution of agglomerated samples, and the digestion efficiency still needs to be further improved. Utility Model Content

[0005] To solve the deficiencies in the background technology, the present utility model provides a microwave digestion device for food detection. Its digestion tank shaking bracket adopts an inclined form, with a ball joint connection at the top. While the digestion tank carrying plate rotates within the conical surface, it also rotates itself, enabling effective shaking actions to improve the digestion efficiency.

[0006] To achieve the above object, the present utility model adopts the following technical solutions: A microwave digestion device for food detection includes a microwave digester and a digestion tank shaking bracket. A rotary drive head is provided at the center of the bottom of the digestion chamber of the microwave digester, and a suspension is fixedly installed at the top of the digestion chamber of the microwave digester. A ring gear is horizontally fixed at the lower end of the suspension. The inner ring surface of the ring gear is a conical surface that is thinner at the top and thicker at the bottom and is processed with teeth. The digestion tank shaking bracket includes a rotary cap, a digestion tank carrying plate, and an assembly connecting rod. The rotary cap is installed on the rotary drive head and rotates synchronously with it. An eccentric groove is integrally provided on the side of the rotary cap. The digestion tank carrying plate is inclined, and a shaft rod is integrally and coaxially provided on its lower surface. The bottom end of the shaft rod is rotatably inserted into the eccentric groove. The assembly connecting rod is coaxially arranged on the top of the digestion tank carrying plate. The top end of the assembly connecting rod is connected to the upper end of the suspension through a ball joint. The center of both the ball joint and the ring gear is located on the axis of the rotary cap. An elastic insertion joint is provided at the bottom end of the assembly connecting rod and is detachably connected to a preset transmission connection groove at the center of the upper surface of the digestion tank carrying plate. The middle section of the assembly connecting rod passes through the ring gear, and the axis of the assembly connecting rod is arranged parallel to the generatrix of the inner ring surface of the ring gear. Rolling teeth are processed and arranged circumferentially at corresponding positions on the side wall of the assembly connecting rod, and the rolling teeth are meshed with the teeth on the inner ring surface of the ring gear.

[0007] Further, the elastic insertion joint includes a sliding rod and a compression spring. A slot is processed axially on the bottom end surface of the assembly connecting rod and the sliding rod is slidably inserted into it. The bottom end of the sliding rod is integrally provided with an insertion head that cooperates with the transmission connection groove. The compression spring is sleeved outside the assembly connecting rod and the sliding rod, and limiting rings for supporting the upper and lower ends of the compression spring are respectively provided on the side wall of the assembly connecting rod and the bottom end of the sliding rod.

[0008] Further, a thumb pressing handle is integrally provided on the side of the limiting ring on the side wall of the assembly connecting rod, and lifting hooks are integrally provided on both sides of the limiting ring at the bottom end of the sliding rod.

[0009] Further, the top end of the assembly connecting rod is rotatably connected to the ball head of the ball joint through a bearing, and the upper end of the suspension is fixedly connected to the bottom of the ball shell of the ball joint.

[0010] Further, a rotating part is rotatably installed in the notch of the eccentric groove through a bearing, and the bottom end of the shaft rod is inserted and connected to the rotating part.

[0011] Further, a plurality of digestion tank installation hole positions are evenly arranged along the circumference at the edge of the digestion tank carrying plate.

[0012] Furthermore, an annular stabilizing wing is integrally provided on the outer side of the bottom of the rotary cap.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] 1. The present utility model improves and designs a shaking bracket for digestion vessels to replace the traditional digestion vessel bracket. The digestion vessel carrier plate thereof adopts an inclined form, is connected to the suspension by a spherical hinge at the top, and is driven to rotate within a conical surface through an eccentric groove on the side of the rotary cap at the bottom. At the same time, with the cooperation of the rolling teeth and the internal gear ring, while the digestion vessel carrier plate rotates within the conical surface, it also rotates itself. During microwave heating, an effective shaking action is performed on the samples in the digestion vessels, which can accelerate the dissolution of agglomerated samples and improve the digestion efficiency.

[0015] 2. For the microwave digestion instrument of the present utility model, only a suspension for connecting the shaking bracket for digestion vessels is installed above its interior, without making other structural modifications to the microwave digestion instrument itself. It is more convenient to improve and apply to the existing microwave digestion instrument, is easy to implement, helps to control costs, and contributes to popularization and popularization. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is an axonometric view of the overall structure of the present utility model;

[0017] Figure 2 is a schematic diagram of the internal structure of the microwave digestion instrument in the present utility model;

[0018] Figure 3 is a schematic diagram of the split structure of the shaking bracket for digestion vessels in the present utility model;

[0019] Figure 4 is Figure 3 an enlarged view of part A of DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0021] Such as Figures 1 to 4As shown in the figure, a microwave digestion device for food detection includes a microwave digestion instrument 1 and a digestion tank shaking bracket. The microwave digestion instrument 1 is a conventional existing device, which is usually used in cooperation with a digestion tank bracket in a cylindrical shape as a whole (the configuration of the digestion tank bracket can be referred to the utility model patent cited in the background art section). A rotary drive head 1-1 is provided at the center of the bottom of the digestion chamber of the microwave digestion instrument 1, and there is a groove at the bottom of the digestion tank bracket that cooperates with it. During the digestion operation, the digestion tank containing the sample is inserted into the digestion tank bracket, and then the entire digestion tank bracket is carried into the digestion chamber of the microwave digestion instrument 1, so that the groove at the bottom of the digestion tank bracket sits on the rotary drive head 1-1. After closing the chamber door, parameters are set through the control panel, and the sample in the digestion tank is heated by the penetrability and reaction activation ability of the microwave to complete the digestion task. During this period, the rotary drive head 1-1 will drive the digestion tank bracket to rotate slowly so that the sample is heated relatively evenly, but the rotation speed cannot be too high. However, for food detection, there are usually digestion requirements for powdery substances such as rice flour and flour. After adding nitric acid to such powdery substances in the digestion tank, they will form lumps and agglomerates. A single slow rotation cannot quickly disperse the lumpy powdery substances, resulting in a problem of low digestion efficiency, and usually there will still be incomplete digestion and residues left after one round of digestion. In view of the above reasons, considering factors such as the ease of implementation of the improvement and cost control, the inventor optimized the design of the digestion tank shaking bracket to replace the traditional digestion tank bracket on the premise of ensuring that the overall structure of the existing microwave digestion instrument 1 remains basically unchanged. When used in cooperation with the microwave digestion instrument 1, it can better shake the sample in the digestion tank while rotating, so as to improve the digestion efficiency.

[0022] Combined with Figure 2 As shown in the figure, in view of the above consideration of ensuring that the overall structure of the existing microwave digestion instrument 1 remains basically unchanged, in this solution, only a suspension 2 is fixedly installed at the top of the digestion chamber of the microwave digestion instrument 1, and no other additional changes are made to the microwave digestion instrument 1 itself. Thus, the improvement of this solution mainly focuses on the digestion tank shaking bracket, which is not only easier to implement on the basis of the existing microwave digestion instrument 1, but also has a relatively low improvement cost. Among them, the upper end of the suspension 2 is fixedly connected to the bottom of the spherical shell 2-1 of the ball joint, which is used for ball joint connection at the top of the digestion tank shaking bracket. The lower end of the suspension 2 is horizontally fixed with an internal gear ring 2-2. The inner ring surface of the internal gear ring 2-2 is a tapered surface that is thinner at the top and thicker at the bottom and is processed with teeth, which is used to cooperate to realize the self-rotation of the digestion tank shaking bracket.

[0023] Combined with Figure 3 As shown in the figure, the digestion tank shaking bracket includes a rotating cap 3, a digestion tank mounting plate 4, and an assembly connecting rod 5. Among them:

[0024] The rotating cap 3 is mounted on the rotating drive head 1-1 and rotates synchronously therewith. An eccentric groove 3-1 is integrally provided on the side of the rotating cap 3 for carrying the bottom end of the digestion tank mounting plate 4. To enhance the stability of the rotating cap 3 and avoid the problem that the rotating cap 3 may be disengaged from the rotating drive head 1-1 due to eccentric support, an annular stabilizing wing is preferably integrally provided on the outer side of the bottom of the rotating cap 3, thereby increasing the contact area between the rotating cap 3 and the bottom surface of the digestion chamber of the microwave digestion instrument 1.

[0025] A plurality of digestion tank mounting holes are evenly arranged along the circumference of the edge of the digestion tank mounting plate 4 for mounting the digestion tank. The digestion tank mounting plate 4 is inclined, and a shaft rod 4-1 is integrally and coaxially provided on its lower surface. The bottom end of the shaft rod 4-1 is rotatably inserted into the eccentric groove 3-1. To avoid excessive rotational friction between the shaft rod 4-1 and the eccentric groove 3-1 and have an adverse impact on the rotational performance and wear problems, a rotating member can be rotatably installed in the notch of the eccentric groove 3-1 through a bearing, and the bottom end of the shaft rod 4-1 is inserted and connected to the rotating member.

[0026] The assembly connecting rod 5 is coaxially arranged on the top of the digestion tank mounting plate 4. A ball head 5-1 is provided at the top of the assembly connecting rod 5 to form a ball hinge connection structure with the ball shell 2-1. The ball hinge itself allows the ball head 5-1 to rotate relative to the ball shell 2-1. However, to further reduce the rotational friction, the top end of the assembly connecting rod 5 can be rotatably connected to the ball head 5-1 of the ball hinge through a bearing. The centers of both the ball hinge and the internal gear ring 2-2 are located on the axis of the rotating cap 3. An elastic plug 5-2 is provided at the bottom end of the assembly connecting rod 5 and is detachably connected to a preset transmission connection groove 4-2 at the center of the upper surface of the digestion tank mounting plate 4, thereby realizing the integrity of the digestion tank mounting plate 4 and the assembly connecting rod 5 while facilitating the installation and disassembly of the digestion tank mounting plate 4 in the microwave digestion instrument 1. The middle section of the assembly connecting rod 5 passes through the internal gear ring 2-2, and the axis of the assembly connecting rod 5 is arranged parallel to the generatrix of the inner ring surface of the internal gear ring 2-2. Rolling teeth 5-3 are machined and arranged along the circumference at the corresponding position of the side wall of the assembly connecting rod 5. The rolling teeth 5-3 are engaged with the teeth on the inner ring surface of the internal gear ring 2-2. Thus, while the rotating cap 3 drives the digestion tank mounting plate 4 to move in a circular motion, due to the existence of the rolling teeth 5-3, the movement of the assembly connecting rod 5 along the internal gear ring 2-2 will also drive the rotation of the digestion tank mounting plate 4 itself.

[0027] Combined with Figure 4As shown, the elastic socket 5-2 includes a sliding rod 5-21 and a compression spring 5-23. A slot is axially machined on the bottom end face of the assembly connecting rod 5 and the sliding rod 5-21 is slidably inserted therein. The sliding rod 5-21 can only telescopically slide within the slot without relative rotation. Therefore, the slot can adopt a polygonal cross-sectional structure, a D-shaped cross-sectional structure or other forms. An insertion joint 5-22 that mates with the transmission connection slot 4-2 is integrally provided at the bottom end of the sliding rod 5-21. Due to the transmission relationship, the transmission connection slot 4-2 can also adopt the cross-sectional configuration of the above-mentioned slot. The compression spring 5-23 is sleeved outside the assembly connecting rod 5 and the sliding rod 5-21. Limiting rings for supporting the upper and lower ends of the compression spring 5-23 are respectively provided on the side wall of the assembly connecting rod 5 and the bottom end of the sliding rod 5-21. Such a design enables the assembly connecting rod 5 to be closely integrated with the digestion tank carrier 4 under the elastic force of the compression spring 5-23. When it is necessary to take out the digestion tank carrier 4 after digestion is completed, only need to manually compress the compression spring 5-23 to separate the elastic socket 5-2 from the digestion tank carrier 4. Preferably, for the convenience of compressing the elastic socket 5-2, a thumb pressing handle 5-24 is integrally provided on the side of the limiting ring on the side wall of the assembly connecting rod 5, and lifting hooks 5-25 are integrally provided on both sides of the limiting ring at the bottom end of the sliding rod 5-21. Thus, by pressing the thumb pressing handle 5-24 with the thumb and pulling up the lifting hooks 5-25 with the index finger and middle finger, the disassembly of the assembly connecting rod 5 and the digestion tank carrier 4 can be conveniently achieved.

[0028] After the digestion tank shaking bracket and the microwave digester 1 are assembled, refer to Figure 1 As shown, among them, the suspension 2 is always fixed in the digestion chamber of the microwave digester 1. An internal gear ring 2-2 is provided on the suspension 2 and the assembly connecting rod 5 is installed through a ball hinge at the same time. The rotating cap 3 can be pre-installed on the rotating drive head 1-1 of the microwave digester 1. During use, first insert the digestion tank containing the sample on the digestion tank carrier 4, and then send it into the digestion chamber of the microwave digester 1. Insert the bottom end of the shaft rod 4-1 of the digestion tank carrier 4 into the eccentric groove 3-1 on the side of the rotating cap 3. Then connect the elastic socket 5-2 at the bottom of the assembly connecting rod 5 with the digestion tank carrier 4. Close the chamber door and set the digestion parameters for the microwave digester 1 according to requirements. During the operation of the microwave digester 1, the rotating drive head 1-1 drives the rotating cap 3 to rotate synchronously. While the shaft rod 4-1 and the assembly connecting rod 5 rotate as a whole within a conical surface with the ball hinge center as the vertex. At the same time, due to the cooperation of the rolling teeth 5-3 and the internal gear ring 2-2, the assembly connecting rod 5 can also drive the digestion tank carrier 4 to rotate itself, thereby accelerating the dispersion of the caked samples in the digestion tank through the shaking action of the digestion tank shaking bracket, and thus improving the digestion efficiency.

[0029] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and the present utility model can be implemented in other forms of devices without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent conditions of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

[0030] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A microwave digestion device for food detection, comprising a microwave digester (1), wherein a rotary drive head (1-1) is arranged at the center of the bottom of the digestion chamber of the microwave digester (1), and it is characterized in that: The microwave digestion device further includes a digestion tank shaking bracket. A suspension (2) is fixedly installed at the top inside the digestion chamber of the microwave digester (1). A ring gear (2-2) is horizontally fixed at the lower end of the suspension (2). The inner ring surface of the ring gear (2-2) is a tapered surface that is thinner at the top and thicker at the bottom and is processed with teeth. The digestion tank shaking bracket includes a rotating cap (3), a digestion tank mounting plate (4), and an assembly connecting rod (5). The rotating cap (3) is covered on the rotating drive head (1-1) and rotates synchronously with it. An eccentric groove (3-1) is integrally provided on the side of the rotating cap (3). The digestion tank mounting plate (4) is inclined, and a shaft rod (4-1) is integrally and coaxially provided on its lower surface. The bottom end of the shaft rod (4-1) is rotatably inserted into the eccentric groove (3-1). The assembly connecting rod (5) is coaxially arranged on the top of the digestion tank mounting plate (4). The top end of the assembly connecting rod (5) is connected to the upper end of the suspension (2) through a ball joint. The center of this ball joint and the ring gear (2-2) are both located on the axis of the rotating cap (3). The bottom end of the assembly connecting rod (5) is provided with an elastic insertion joint (5-2) and is detachably connected to a preset transmission connection groove (4-2) at the center of the upper surface of the digestion tank mounting plate (4). The middle section of the assembly connecting rod (5) passes through the ring gear (2-2), and the axis of the assembly connecting rod (5) is arranged parallel to the generatrix of the inner ring surface of the ring gear (2-2). Rolling teeth (5-3) are processed and arranged circumferentially at corresponding positions on the side wall of the assembly connecting rod (5). The rolling teeth (5-3) are engaged with the teeth on the inner ring surface of the ring gear (2-2).

2. The microwave digestion device for food detection according to claim 1, wherein: The elastic insertion joint (5-2) includes a sliding rod (5-21) and a compression spring (5-23). A slot is processed axially on the bottom end surface of the assembly connecting rod (5) and the sliding rod (5-21) is slidably inserted. The bottom end of the sliding rod (5-21) is integrally provided with an insertion joint (5-22) that cooperates with the transmission connection groove (4-2). The compression spring (5-23) is sleeved outside the assembly connecting rod (5) and the sliding rod (5-21). Limiting rings for supporting the upper and lower ends of the compression spring (5-23) are respectively provided on the side wall of the assembly connecting rod (5) and the bottom end of the sliding rod (5-21).

3. The microwave digestion device for food detection according to claim 2, characterized in that: A thumb pressing handle (5-24) is integrally provided on the side of the limiting ring on the side wall of the assembly connecting rod (5). Lifting hooks (5-25) are integrally provided on both sides of the limiting ring at the bottom end of the sliding rod (5-21).

4. A microwave digestion device for food detection according to claim 1, characterized in that: The top end of the assembly connecting rod (5) is rotatably connected to the ball head (5-1) of the ball joint through a bearing. The upper end of the suspension (2) is fixedly connected to the bottom of the ball shell (2-1) of the ball joint.

5. A microwave digestion device for food detection according to claim 1, characterized in that: A rotating part is rotatably installed in the notch of the eccentric groove (3-1) through a bearing. The bottom end of the shaft rod (4-1) is inserted and connected to the rotating part.

6. The microwave digestion device for food detection according to claim 1, wherein: A plurality of digestion tank installation holes are evenly arranged along the circumference at the edge of the digestion tank mounting plate (4).

7. A microwave digestion device for food detection according to claim 1, characterized in that: An annular stabilizing wing is integrally provided on the outer side of the bottom of the rotating cap (3).

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