Rapid sample preparation equipment for food inspection

Abstract

The invention relates to rapid sample preparation equipment for food inspection, which comprises a crushing and stirring assembly, the crushing and stirring assembly comprises a base and a cylinder body arranged right above the base, the axis position between the base and the cylinder body is connected through a stand column, a rotating shaft is coaxially arranged in the cylinder body, the lower end of the rotating shaft is provided with a crushing cutter group, and the crushing cutter group is connected with the rotating shaft. Stirring fins are arranged in the middle of the rotating shaft; the quantitative sub-packaging part comprises a quantitative discharging assembly for extracting the sample liquid in the cylinder body under negative pressure and a rotary sub-packaging assembly for receiving the quantitative sample liquid one by one. The four functions of crushing, stirring, quantifying and sub-packaging are integrated into one device, the integrated operation of feeding, sample preparation and sub-packaging is achieved, a user only needs to put a sample and prepare a sample tube, rapid sample preparation of the sample can be completed, and the sample preparation efficiency of food inspection is improved.

Description

Technical Field

[0001] This invention relates to the field of food inspection sample pretreatment technology, and in particular to a rapid sample preparation device for food inspection. Background Technology

[0002] In food inspection and testing, sample preparation is the first and most crucial step. Its purpose is to process solid, semi-solid, or viscous food samples (such as fruits, vegetables, meats, and sauces) into homogeneous and representative liquid or slurry samples for subsequent physicochemical or microbiological analysis.

[0003] Currently, routine sample preparation procedures in laboratories typically rely on multiple independent devices to complete the process step by step: during the crushing and homogenization process, a separate crusher, grinder, or homogenizer is often used to pre-treat the sample; during the transfer and dilution process, the treated sample is usually manually transferred to a beaker or graduated cylinder, and may require the addition of extraction or diluent; during the stirring and mixing process, a magnetic stirrer or glass rod is usually used for manual stirring to ensure that the sample and solution are thoroughly and uniformly mixed; during the quantitative dispensing process, a quantitative amount of sample liquid is usually manually drawn using a pipette or graduated cylinder and then dispensed into multiple sample tubes for subsequent parallel testing of multiple items.

[0004] Existing technologies have the following main shortcomings: Cumbersome operation and low efficiency: The entire process involves multiple transfers and equipment changes, making the steps cumbersome, time-consuming, and labor-intensive, failing to meet the high-throughput and rapid response requirements of modern food testing; High risk of cross-contamination: Transferring samples between multiple containers and incomplete cleaning of utensils and tools can easily lead to cross-contamination, affecting the accuracy of test results; Poor sample representativeness and homogeneity: Homogenization relying on manual stirring or existing equipment has limited effect, easily causing sedimentation, stratification, and even poor uniformity, resulting in inconsistent sample concentrations each time, insufficient representativeness, and introducing significant experimental errors; Difficulty in guaranteeing quantitative accuracy: Although manual pipetting has acceptable accuracy, repetitive operations are prone to errors due to human fatigue.

[0005] The present invention aims to address one or more deficiencies in the prior art and provide an integrated, highly automated, and highly accurate rapid sample preparation device. Summary of the Invention

[0006] In view of the above problems, the present invention provides a rapid sample preparation device for food testing that integrates crushing, mixing, quantitative extraction and dispensing, and has the advantages of crushing and uniform mixing.

[0007] The specific technical solution is as follows: A rapid sample preparation device for food testing, comprising: The crushing and mixing assembly includes a base and a cylinder located directly above the base. The axis between the base and the cylinder is connected by a column. A rotating shaft is coaxially arranged inside the cylinder. A crushing blade assembly is arranged at the lower end of the rotating shaft, and a mixing fin is arranged in the middle of the rotating shaft. The quantitative dispensing component includes a quantitative dispensing assembly for extracting sample liquid from inside the cylinder under negative pressure and a rotary dispensing assembly for collecting quantitative sample liquid one by one. The quantitative discharging assembly includes a cylinder, with a feed inlet communicating with the lower end of the cylinder's interior at the lower side end, a dispensing outlet at the lower end of the cylinder, a piston that is slidably fitted inside the cylinder, and a drive mechanism for driving the piston to move axially within the cylinder at the upper end of the cylinder's interior. The rotary dispensing assembly includes a turntable coaxially mounted on a column. The turntable has circular through holes for placing sample tubes through its upper and lower end faces. The circular through hole located at the liquid receiving position is coaxial with the dispensing outlet. The turntable is also provided with a positioning assembly that is elastically engaged with the upper end face of the base and the lower end face of the cylinder.

[0008] Furthermore, the driving mechanism includes a first partition plate disposed inside the cylinder, which divides the inside of the cylinder into a negative pressure chamber at the lower end and a driving chamber at the upper end. A first lead screw is coaxially disposed inside the driving chamber, and a first ball nut slider is adapted to the first lead screw. A plurality of first connecting rods are vertically disposed on the lower end face of the first ball nut slider, and the lower ends of the first connecting rods are connected to the piston. A first motor for driving the first lead screw to rotate is disposed at the upper end of the cylinder.

[0009] Furthermore, the first motor is a servo motor.

[0010] Furthermore, the first partition plate is provided with a first guide hole that is adapted to the first connecting rod.

[0011] Furthermore, the cylinder is located on the side of the cylinder body, and the feed end of the feed port is located on the lower inner end face of the cylinder body, the discharge end of the feed port is located on the lower inner end face of the cylinder, and a feed control valve is provided on the feed port.

[0012] Furthermore, the dispensing outlet is coaxially located at the lower end of the cylinder, and a dispensing control valve is also provided on the dispensing outlet.

[0013] Furthermore, the diameter of the turntable is larger than the outer diameter of the cylinder, and a plurality of circular through holes are provided, which are arranged sequentially at equal intervals along the circumference of the turntable.

[0014] Furthermore, the diameter of the circular through hole is greater than or equal to the outer diameter of the sample tube, and less than the outer diameter of the upper flange of the sample tube.

[0015] Furthermore, the turntable has multiple anti-slip protrusions arranged at equal intervals along its circumference on its side surface.

[0016] Furthermore, the positioning component includes a chamber disposed inside the turntable. The chamber is cylindrical and vertically disposed inside the turntable. A second partition is coaxially disposed in the middle of the chamber, dividing the chamber into a first positioning cavity and a second positioning cavity. A first positioning ball is adapted to be disposed in the first positioning cavity. A first circular opening is provided on the upper end face of the turntable for the first positioning ball to pass through partially. A first return spring is disposed between the first positioning ball and the second partition. A first positioning groove is provided on the lower end face of the cylinder to cooperate with the first positioning ball. A second positioning ball is adapted to be disposed in the second positioning cavity. A second circular opening is provided on the lower end face of the turntable for the second positioning ball to pass through partially. A second return spring is disposed between the second positioning ball and the second partition. A second positioning groove is provided on the upper end face of the base to cooperate with the second positioning ball.

[0017] Furthermore, the diameter of the first circular opening is smaller than the diameter of the first positioning ball.

[0018] Furthermore, the number of positioning components is the same as the number of circular through holes, and several positioning components are arranged sequentially at equal intervals along the circumference of the turntable.

[0019] Furthermore, a lifting mechanism is provided directly below the cylinder. The lifting mechanism includes a vertically upward-mounted lifting cylinder. The cylinder body of the lifting cylinder is connected to the side of the base via a connecting seat. A lifting base plate is coaxially mounted on the piston rod of the lifting cylinder. A lifting plate is coaxially connected to the upper end of the lifting base plate via a pressure sensor. A flexible pad is provided on the upper surface of the lifting plate.

[0020] Furthermore, an annular plate is coaxially provided at the lower end of the dispensing outlet, and a flexible annular pad is provided on the lower end surface of the annular plate.

[0021] Furthermore, the stirring fin is arc-shaped, the middle part of the stirring fin is connected to the rotating shaft, the arc opening of the stirring fin is set downward, and the two ends of the stirring fin extend downward to the lower end of the inner cavity of the cylinder.

[0022] Furthermore, the front and rear sides of the stirring blade are provided with blades along their arc direction.

[0023] Furthermore, a plurality of stirring blades are provided, and the plurality of stirring blades are arranged sequentially at equal intervals around the axial direction of the rotation axis.

[0024] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention provides a rapid sample preparation device for food inspection. The present invention integrates four major functions of crushing, stirring, quantitative and dispensing into one device, realizing the integrated operation of feeding, sample preparation and dispensing. Users only need to put in the sample and prepare the sample tube to complete the rapid sample preparation, which improves the sample preparation efficiency of food inspection.

[0025] (2) The present invention provides a rapid sample preparation device for food testing. The sample is processed in a sealed cylinder and tank throughout the process, which reduces the possibility of exposure to air during dispensing, avoids repeated transfer between different containers, and ensures the authenticity and reliability of the test data.

[0026] (3) The present invention provides a rapid sample preparation device for food testing. By setting up a uniform liquid supply component, the additive liquid can be uniformly transported to the annular liquid receiving tank through the adaptive liquid supply component. The annular liquid receiving tank rotates with the rotating shaft. The additive liquid enters the liquid supply chamber through the liquid supply pipe through the action of its own gravity and centrifugal force, and flows into the sample at various angles through the liquid supply hole. This improves the initial uniformity of the additive liquid, facilitates subsequent mixing and stirring, reduces mixing and stirring time, and improves mixing uniformity. Moreover, the adaptive liquid supply component can automatically adjust the flow rate according to the different dosages of the additive liquid, especially ensuring the uniformity of mixing with the sample when the dosage is small.

[0027] (4) The present invention provides a rapid sample preparation device for food inspection. By setting up a crushing drive component, the second motor can drive the drive shaft to rotate. The rotational motion of the drive shaft is transmitted to the driven gear through the active gear, which forces the driven gear to rotate and revolve under the action of the fixed internal gear ring. The rotation of the driven gear can drive the second ball nut block to follow the rotation and revolve, which in turn can drive the second lead screw to generate axial motion. The revolve of the driven gear and the driven rotating plate can drive the second lead screw and the spline shaft to generate rotational motion, thereby driving the rotation and reciprocating axial compound motion of the rotating shaft. Finally, it can drive the crushing blade assembly and the stirring blade to rotate around the shaft and reciprocate up and down, thereby improving the efficiency and uniformity of stirring and crushing. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention.

[0029] Figure 2 This is a schematic diagram of the quantitative discharge component structure of the present invention.

[0030] Figure 3 This is a schematic diagram of the rotating dispensing assembly structure of the present invention.

[0031] Figure 4 This is the present invention. Figure 3A magnified view of part A.

[0032] Figure 5 This is a schematic diagram of the evenly distributed circular through-hole structure of the present invention.

[0033] Figure 6 This is a schematic diagram of the lifting mechanism structure of the present invention.

[0034] Figure 7 This is a schematic diagram of the uniform liquid supply component of the present invention.

[0035] Figure 8 This is a schematic diagram of the adaptive liquid delivery component structure of the present invention.

[0036] Figure 9 This is a schematic diagram of the crushing drive component of the present invention.

[0037] Figure 10 This is a schematic diagram of the uniformly distributed driven gear structure of the present invention.

[0038] Figure 11 This is a schematic diagram of the driven rotating plate structure of the present invention.

[0039] In the diagram: 1. Base; 2. Column; 3. Cylinder; 4. Rotating shaft; 5. Crushing blade assembly; 6. Agitator blade; 61. Blade section; 62. Liquid supply chamber; 63. Liquid supply hole; 7. Crushing drive component; 71. Drive housing; 72. Second bearing; 73. Transmission shaft; 74. Drive gear; 75. Driven gear; 76. Internal gear ring; 77. Driven rotating plate; 78. Third bearing; 79. Connecting cylinder; 710. Fourth bearing; 711. Second ball bearing nut block; 712. Second lead screw; 713. Second connecting rod; 714. Splined cylinder; 715. Splined shaft; 716. Cavity; 717. Second motor; 8. Quantitative discharge assembly; 81. Cylinder; 82. Feed inlet; 83. Dispensing outlet; 84. Piston; 851. First partition plate; 852. Negative pressure chamber; 853. Drive chamber; 854. First lead screw; 855. First ball bearing nut slider ; 856, First connecting rod; 857, First motor; 88, Annular plate; 89, Flexible annular pad; 9, Rotary dispensing assembly; 91, Turntable; 92, First bearing; 93, Circular through hole; 94, Positioning assembly; 942, Second partition plate; 943, First positioning cavity; 944, Second positioning cavity; 945, First positioning ball; 946, First return spring; 947, First positioning groove; 948, Second positioning ball; 949, Second return spring; 9410, Second positioning groove; 10, Lifting mechanism; 101, Connecting seat; 102, Lifting cylinder; 103, Lifting plate; 104, Flexible pad; 11, Uniform liquid dispensing component; 111, Annular liquid receiving groove; 112, Liquid dispensing pipe; 113, Liquid dispensing cylinder; 114, Adaptive liquid dispensing assembly; 115, Rigid shell; 116, Elastic medium; 117, Liquid dispensing channel; 12, Sample tube. Detailed Implementation

[0040] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0041] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] Example 1 This invention provides a rapid sample preparation device for food testing, referenced. Figure 1 It includes a crushing and mixing assembly and a quantitative dispensing component.

[0043] refer to Figure 1The crushing and mixing assembly includes a base 1, a column 2, and a cylinder 3. The cylinder 3 is fixed above the base 1 by the column 2. A rotating shaft 4 is coaxially arranged inside the cylinder 3. A crushing blade assembly 5 is mounted at the lower end of the rotating shaft 4 for high-speed crushing of food samples fed into the cylinder 3. A stirring fin 6 is mounted in the middle of the rotating shaft 4. The stirring fin 6 is arc-shaped and connected to the rotating shaft 4 in the middle. The arc opening of the stirring fin 6 faces downward, and both ends of the stirring fin 6 extend downward to the lower end of the cylinder 3. Blade portions 61 are provided on the front and rear sides of the stirring fin 6 along its arc direction. Several stirring fins 6 are arranged at equal intervals around the axis of rotation. The blade portions 61 participate in the crushing process. The stirring fins 6 are used to stir and mix the crushed sample liquid to ensure its uniformity. A cylinder cover is adapted to the upper end of the cylinder 3. The upper end of the rotating shaft 4 is connected to the cylinder cover through a bearing. A crushing drive component 7 for driving the rotating shaft 4 to rotate is provided on the upper end of the cylinder cover. In this embodiment, the crushing drive component 7 includes a second motor 717 for driving the rotating shaft 4 to rotate, and the operation of the second motor 717 realizes the driving of the rotating shaft 4.

[0044] refer to Figure 1 The quantitative dispensing component includes a quantitative dispensing assembly 8 for extracting sample liquid from inside the cylinder 3 under negative pressure and a rotary dispensing assembly 9 for collecting quantitative sample liquid one by one.

[0045] Furthermore, as a specific implementation method, refer to Figure 1 and Figure 2 The quantitative dispensing assembly 8 includes a cylinder 81. The lower side of the cylinder 81 has an inlet 82 communicating with the lower interior of the cylinder body 3. The lower end of the cylinder 81 has a dispensing outlet 83. The cylinder 81 is internally sealed and slidably fitted with a piston 84. The upper interior of the cylinder 81 has a drive mechanism for driving the piston 84 to move axially within the cylinder 81. The movement of the piston 84 is controlled by a precise drive mechanism (such as a screw and nut mechanism), thereby accurately extracting and dispensing a fixed volume of sample liquid.

[0046] Furthermore, as a specific implementation method, refer to Figure 1 and Figure 2The driving mechanism includes a first partition 851 disposed inside the cylinder 81, which divides the interior of the cylinder 81 into a negative pressure chamber 852 at the lower end and a driving chamber 853 at the upper end. A first lead screw 854 is coaxially disposed inside the driving chamber 853. A first ball bearing nut slider 855 is fitted onto the first lead screw 854. A plurality of first connecting rods 856 are vertically arranged downwards on the lower end face of the first ball bearing nut slider 855. The lower ends of the first connecting rods 856 are connected to the piston 84. A first motor 857 for driving the first lead screw 854 to rotate is disposed at the upper end of the cylinder 81; the first motor 857 is a servo motor. The first partition 851 is provided with first guide holes adapted to the first connecting rods 856. The driving mechanism, driven by the first motor 857, rotates the first lead screw 854, causing the first ball bearing nut slider 855 and the piston 84 connected to it via the first connecting rods 856 to perform precise up-and-down movements, achieving quantitative suction and discharge. The first lead screw 854 is driven by a servo motor to control the stroke of the piston 84, which can control the volume of sample liquid extracted and discharged with extremely high precision. The accuracy is far higher than that of manual pipetting, and the repeatability is excellent. It is not affected by the viscosity of the sample or the operator's factors.

[0047] Furthermore, as a specific implementation method, refer to Figure 1 and Figure 2 The cylinder 81 is located on the side of the cylinder 3, and the feed end of the feed port 82 is located on the lower end face of the cylinder 3. The discharge end of the feed port 82 is located on the lower end face of the cylinder 81. A feed control valve is provided on the feed port 82. The dispensing outlet 83 is coaxially located at the lower end of the cylinder 81. A dispensing control valve is also provided on the dispensing outlet 83.

[0048] Furthermore, as a specific implementation method, refer to Figure 1 and Figure 3The rotating dispensing assembly 9 includes a turntable 91 coaxially mounted on the column 2. The turntable 91 is connected to the column 2 via a first bearing 92. The diameter of the turntable 91 is larger than the outer diameter of the cylinder 3. The turntable 91 has circular through holes 93 through its upper and lower end faces for placing sample tubes 12. The diameter of the circular through holes 93 is greater than or equal to the outer diameter of the sample tube 12 and smaller than the outer diameter of the upper flange of the sample tube 12. There are several circular through holes 93, which are arranged at equal intervals along the circumference of the turntable 91. The circular through holes 93 located at the liquid receiving position are coaxial with the dispensing outlet 83. The turntable 91 is also provided with a positioning assembly 94 that is elastically engaged with the upper end face of the base 1 and the lower end face of the cylinder 3. Multiple anti-slip protrusions are arranged at equal intervals along the circumference of the side of the turntable 91. When the turntable 91 rotates at a certain angle, each circular through-hole 93 can be precisely positioned directly below the dispensing outlet 83, thereby positioning the sample tube 12 placed inside the circular through-hole 93 directly below the dispensing outlet 83 for easy liquid filling. The positioning component 94 adopts a ball-groove elastic snap-fit ​​structure to ensure the relative fixation of the turntable 91 with the base 1 and the cylinder 3 during dispensing, without any shaking, and facilitates automatic alignment and positioning of the turntable 91 at each rotation angle. The anti-slip protrusions on the turntable 91 facilitate slight manual rotation to switch workstations, demonstrating a user-friendly design.

[0049] Furthermore, as a specific implementation method, refer to Figure 1 , Figure 3 , Figure 4 and Figure 5The positioning component 94 includes a chamber disposed inside the turntable 91. The chamber is cylindrical and vertically disposed inside the turntable 91. A second partition 942 is coaxially disposed in the middle of the chamber, dividing the chamber into a first positioning cavity 943 and a second positioning cavity 944. A first positioning ball 945 is adapted to fit inside the first positioning cavity 943. The upper end face of the turntable 91 is provided with a first circular opening for the first positioning ball 945 to partially pass through. A first return spring 946 is disposed between the first positioning ball 945 and the second partition 942. The lower end face of the cylinder 3 is provided with a first positioning groove 947 that cooperates with the first positioning ball 945. A second positioning ball 948 is fitted inside the second positioning cavity 944. The lower end face of the turntable 91 has a second circular opening for the second positioning ball 948 to pass through partially. A second return spring 949 is provided between the second positioning ball 948 and the second partition plate 942. The upper end face of the base 1 has a second positioning groove 9410 that mates with the second positioning ball 948. The diameter of the first circular opening is smaller than the diameter of the first positioning ball 945; the diameter of the second circular opening is smaller than the diameter of the second positioning ball 948; the number of positioning components 94 is the same as the number of circular through holes 93, and several positioning components 94 are arranged at equal intervals along the circumference of the turntable 91. Under the action of the springs, the first positioning ball 945 and the second positioning ball 948 within the positioning component 94 partially protrude from the upper and lower surfaces of the turntable 91. When the turntable 91 rotates to its position, the first positioning ball 945 engages with the first positioning groove 947 at the bottom of the cylinder 3, and the second positioning ball 948 engages with the second positioning groove 9410 on the base 1, achieving precise positioning and locking. The positioning component 94 ensures that the turntable 91 can be accurately positioned and locked at each station, preventing movement or vibration during the dispensing process and ensuring the alignment accuracy of the dispensing.

[0050] Furthermore, as a specific implementation method, refer to Figure 1 , Figure 3 and Figure 6A lifting mechanism 10 is also provided directly below the cylinder 81. The lifting mechanism 10 includes a vertically upward lifting cylinder 102. The cylinder body of the lifting cylinder 102 is connected to the side of the base 1 through a connecting seat 101. A lifting base plate is coaxially provided on the piston 84 rod of the lifting cylinder 102. A lifting plate 103 is coaxially connected to the upper end of the lifting base plate through a pressure sensor. A flexible pad 104 is provided on the upper end surface of the lifting plate 103. An annular plate 88 is coaxially provided on the lower end of the dispensing outlet 83. A flexible annular pad 89 is provided on the lower end surface of the annular plate 88. The cooperation between the lifting mechanism 10 and the annular flexible sealing gasket allows the upper end of the sample tube 12 and the dispensing outlet 83 to form a sealed space during dispensing, ensuring that viscous liquid can be completely discharged into the tube without residue or leakage, further guaranteeing the accuracy of quantification; the cooperation between the pressure sensor and the flexible gasket 104 ensures the lifting force on the sample tube 12 when controlling the working stroke of the lifting cylinder 102.

[0051] This invention discloses a rapid sample preparation device for food testing, the workflow of which includes the following steps: S1. Place the food to be tested into the cylinder 3, cover the cylinder, start the crushing drive unit 7, crushing blade group 5 and stirring fin 6 to make the sample into a uniform solution. S2, the feed control valve is opened, the dispensing control valve is closed, and the drive mechanism of the quantitative discharge component 8 drives the piston 84 to move upward, drawing a quantitative sample liquid from the bottom of the cylinder 3 into the negative pressure chamber 852 of the cylinder 81. S3, the feed control valve closes, the lifting cylinder 102 of the lifting mechanism 10 actuates, and the lifting plate 103 moves upward to push the sample tube 12 upward, so that its tube opening is pressed against the flexible annular gasket 89 at the lower end of the dispensing outlet 83 to form a seal. Then the dispensing control valve opens, and the drive mechanism drives the piston 84 downward to push out the sample liquid. S4. After the dispensing is completed, the lifting mechanism 10 descends, and the turntable 91 is manually driven to rotate one station. The next empty sample tube 12 is in place, and steps S2-S3 are repeated until all sample tubes 12 are dispensed.

[0052] Example 2 During the food sample preparation process, it is sometimes necessary to add extract or diluent. Depending on the type of sample preparation, the dosage of extract or diluent may vary. In the technical solution of Example 1, the dilution process is usually carried out manually after measuring different dosages of the added liquid and then manually pouring it directly into the cylinder 3 for stirring. This may result in uneven mixing of the added liquid and the sample or require a lot of stirring time to improve the uniformity of mixing.

[0053] Based on this, this embodiment discloses a rapid sample preparation device for food testing, which is based on Embodiment 1 and refers to... Figure 1 and Figure 7 The system also includes a uniform liquid supply component 11, which comprises an annular liquid receiving groove 111 coaxially mounted on the upper end of the rotating shaft 4 and an adaptive liquid supply assembly 114 mounted on the upper end of the cylinder cover for supplying liquid into the annular liquid receiving groove 111. The outer wall of the annular liquid receiving groove 111 is connected to several liquid supply pipes 112, the lower ends of which are connected to a liquid supply chamber 62 inside the stirring blade 6. The left and right ends of the outer side of the stirring blade 6 are respectively provided with several liquid supply holes 63 communicating with the liquid supply chamber 62. The adaptive liquid supply assembly 114 can uniformly supply the added liquid to the annular liquid receiving groove 111. The annular liquid receiving groove 111 rotates with the rotating shaft 4. Through the gravity and centrifugal force of the added liquid, it enters the liquid supply chamber 62 through the liquid supply pipes 112 and flows uniformly into the sample at various angles through the liquid supply holes 63, improving the initial uniformity of the added liquid, facilitating subsequent mixing and stirring, reducing mixing time, and improving mixing uniformity.

[0054] Furthermore, as a specific implementation method, refer to Figure 7 and Figure 8 The adaptive liquid dispensing assembly 114 includes a rigid shell 115, with a liquid dispensing cylinder 113 at the upper end of the rigid shell 115. An elastic medium 116 is disposed inside the rigid shell 115, and the lower end of the rigid shell 115 extends into the annular liquid receiving groove 111. Multiple liquid dispensing holes 63 are provided inside the elastic medium 116, penetrating its upper and lower end faces. The rigid shell 115 provides structural constraints. The elastic medium 116 is selected from sintered polyethylene, porous silicone rubber, and hydrogel. When the dosage of the added liquid is small, the fluid pressure is insufficient to cause the elastic medium 116 to expand. Under capillary force and weak pressure, the added liquid slowly passes through the small liquid dispensing holes 63, preventing the entire liquid from flowing into the cylinder 3 at once when the dosage is small, thus avoiding uneven initial mixing. When the dosage of the added liquid is large, the fluid pressure causes the elastic medium 116 to expand radially. This expansion stretches the internal liquid dispensing holes 63, increasing their diameter and reducing flow resistance, allowing the added liquid to pass through quickly and ensuring the addition rate when the dosage of the added liquid is large.

[0055] Example 3 Based on Example 2, in order to further improve the uniformity of sample crushing and mixing and reduce the mixing time, this example discloses a rapid sample preparation device for food testing, referencing... Figure 1 , Figure 9 , Figure 10 and Figure 11The crushing drive component 7 also includes a drive housing 71 located at the upper end of the cylinder cover. Inside the drive housing 71, a drive shaft 73 is coaxially mounted on the upper end via a second bearing 72. A drive gear 74 is coaxially mounted on the lower end of the drive shaft 73. Several driven gears 75 mesh with the drive gear 74. An internal gear ring 76, meshing with the driven gears 75, is coaxially mounted on the inner wall of the drive housing 71. A driven rotating plate 77 is also coaxially mounted on the inner wall of the drive housing 71 via a third bearing 78. The driven gears 75 are connected to the driven rotating plate 77 via a connecting cylinder 79 and a fourth bearing 710. The plates 77 are connected, and each driven gear 75 is also coaxially provided with a second ball nut block 711. The second ball nut block 711 is adapted to be equipped with a second lead screw 712. The driven rotating plate 77 is coaxially provided with a splined cylinder 714. The splined cylinder 714 is adapted to be equipped with a splined shaft 715. The lower ends of several second lead screws 712 are connected to the lower ends of the splined shaft 715 through a second connecting rod 713. The lower end of the splined shaft 715 is coaxially connected to the upper end of the rotating shaft 4. The second motor 717 is located at the upper end of the drive housing 71 and drives the transmission shaft 73 to rotate.

[0056] The second motor 717 is designed to drive the drive shaft to rotate. The rotation of the drive shaft is transmitted to the driven gear 75 through the driving gear 74, forcing the driven gear 75 to rotate and revolve under the action of the fixed internal gear ring 76. The rotation of the driven gear 75 can drive the second ball nut block 711 to follow the rotation and revolve, which in turn can drive the second lead screw to generate axial movement. The revolve of the driven gear 75 and the driven rotating plate 77 can drive the second lead screw and the spline shaft 715 to generate rotational movement, thereby driving the combined rotation and reciprocating axial movement of the rotating shaft 4. Finally, it can drive the crushing blade assembly 5 and the stirring blade 6 to rotate around the axis and reciprocate up and down, thereby improving the efficiency and uniformity of stirring and crushing.

[0057] The inner ring of the connecting cylinder 79 allows the second lead screw to pass through.

[0058] The lower end of the drive shaft 13 is also provided with a cavity 716 for the spline shaft 715 to pass through.

[0059] The splined sleeve 714 enables the splined shaft 715 to transmit rotational motion while allowing axial relative movement.

[0060] The number of driven gears 75 is three, and they are evenly distributed at 120 degrees on the driven gears 75.

[0061] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The embodiments described above are merely illustrative of implementation methods of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A rapid sample preparation device for food testing, characterized in that, include: The crushing and mixing assembly includes a base (1) and a cylinder (3) located directly above the base (1). The axial positions of the base (1) and the cylinder (3) are connected by a column (2). A rotating shaft (4) is coaxially arranged inside the cylinder (3). A crushing blade assembly (5) is arranged at the lower end of the rotating shaft (4). A stirring fin (6) is arranged in the middle of the rotating shaft (4). The quantitative dispensing component includes a quantitative dispensing assembly (8) for extracting sample liquid from the inside of the cylinder (3) under negative pressure and a rotary dispensing assembly (9) for collecting quantitative sample liquid one by one. The quantitative discharge assembly (8) includes a cylinder (81), with a feed inlet (82) connected to the lower end of the cylinder (3) on the side of the lower end of the cylinder (81), and a dispensing outlet (83) at the lower end of the cylinder (81). The cylinder (81) is sealed inside and slidably fitted with a piston (84). The upper end of the cylinder (81) is provided with a drive mechanism for driving the piston (84) to move axially inside the cylinder (81). The rotary dispensing assembly (9) includes a turntable (91) coaxially mounted on the column (2). The turntable (91) has a circular through hole (93) through its upper and lower end faces for placing sample tubes (12). The circular through hole (93) located at the liquid receiving position is coaxial with the dispensing outlet (83). The turntable (91) is also provided with a positioning assembly (94) that is elastically engaged with the upper end face of the base (1) and the lower end face of the cylinder (3).

2. The rapid sample preparation device for food testing according to claim 1, characterized in that, The driving mechanism includes a first partition (851) disposed inside the cylinder (81), the first partition (851) dividing the inside of the cylinder (81) into a negative pressure chamber (852) located at the lower end and a driving chamber (853) located at the upper end. A first lead screw (854) is coaxially disposed inside the driving chamber (853). A first ball nut slider (855) is adapted on the first lead screw (854). A plurality of first connecting rods (856) are vertically arranged on the lower end face of the first ball nut slider (855). The lower end of the first connecting rod (856) is connected to the piston (84). A first motor (857) for driving the first lead screw (854) to rotate is disposed at the upper end of the cylinder (81).

3. The rapid sample preparation device for food testing according to claim 1 or 2, characterized in that, The cylinder (81) is located on the side of the cylinder (3), and the feed end of the feed port (82) is located on the lower end face of the cylinder (3). The discharge end of the feed port (82) is located on the lower end face of the cylinder (81). A feed control valve is provided on the feed port (82).

4. The rapid sample preparation device for food testing according to claim 3, characterized in that, The dispensing outlet (83) is coaxially located at the lower end of the cylinder (81), and a dispensing control valve is also provided on the dispensing outlet (83).

5. The rapid sample preparation device for food testing according to claim 4, characterized in that, The diameter of the turntable (91) is larger than the outer diameter of the cylinder (3). Several circular through holes (93) are provided, and the several circular through holes (93) are arranged at equal intervals along the circumference of the turntable (91).

6. The rapid sample preparation device for food testing according to claim 5, characterized in that, The positioning component (94) includes a chamber disposed inside the turntable (91). The chamber is cylindrical and vertically disposed inside the turntable (91). A second partition (942) is coaxially disposed in the middle of the chamber. The second partition (942) divides the chamber into a first positioning cavity (943) and a second positioning cavity (944) on its upper and lower sides. A first positioning ball (945) is adapted to be disposed in the first positioning cavity (943). A first circular opening is provided on the upper end face of the turntable (91) for the first positioning ball (945) to partially pass through. A space is provided between the first positioning ball (945) and the second partition (942). A first return spring (946) is provided, and a first positioning groove (947) that cooperates with the first positioning ball (945) is provided on the lower end face of the cylinder (3); a second positioning ball (948) is adapted to be installed in the second positioning cavity (944); a second circular opening for the second positioning ball (948) to partially pass through is provided on the lower end face of the turntable (91); a second return spring (949) is provided between the second positioning ball (948) and the second partition (942); and a second positioning groove (9410) that cooperates with the second positioning ball (948) is provided on the upper end face of the base (1).

7. The rapid sample preparation device for food testing according to claim 6, characterized in that, The number of positioning components (94) is the same as the number of circular through holes (93), and several positioning components (94) are arranged sequentially at equal intervals along the circumference of the turntable (91).

8. The rapid sample preparation device for food testing according to claim 7, characterized in that, A lifting mechanism (10) is also provided directly below the cylinder (81). The lifting mechanism (10) includes a vertically upward lifting cylinder (102). The cylinder body of the lifting cylinder (102) is connected to the side of the base (1) through a connecting seat (101). A lifting base plate is coaxially provided on the piston rod of the lifting cylinder (102). A lifting plate (103) is coaxially connected to the upper end of the lifting base plate through a pressure sensor. A flexible pad (104) is provided on the upper surface of the lifting plate (103).

9. The rapid sample preparation device for food testing according to claim 8, characterized in that, The lower end of the dispensing outlet (83) is coaxially provided with an annular plate (88), and the lower end surface of the annular plate (88) is provided with a flexible annular pad (89).

10. The rapid sample preparation device for food testing according to claim 1, characterized in that, The stirring wing (6) is arc-shaped, and the middle part of the stirring wing (6) is connected to the rotating shaft (4). The arc opening of the stirring wing (6) is set downward, and the two ends of the stirring wing (6) extend downward to the lower end of the inner part of the cylinder (3).

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