Device for detecting residual quantity of sulfur dioxide in food

Abstract

The utility model discloses a device for detecting the residual quantity of sulfur dioxide in food, and belongs to the technical field of food detection equipment. The detection device comprises a main machine and a heating area which is arranged on the main machine and is used for placing a distillation flask, and further comprises a sampling assembly which comprises a bottom plate which is in sliding connection with the bottom side of the main machine through a clamping groove; the placing areas are arranged in the length direction of the bottom plate at intervals and used for placing collecting bottles; the supporting rod assembly comprises supporting rods arranged at the two ends of the top of the main machine and located on the side, not close to the bottom plate, of the heating area. The mounting plate is arranged on the supporting rod, and the length direction is consistent with that of the host; the clamp is arranged on the mounting plate and is used for clamping the condenser pipe; the top of the bottom plate, the top of the main machine and the top of the supporting rod are sequentially heightened. The number of the placing areas and the number of the clamps are consistent with that of the heating areas. After distillation is completed, the bottom plate can be separated from the main machine and moved to the operation table for titration; meanwhile, a standby bottom plate can be connected with a main machine, so that sample distillation is performed again, and the working efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of food testing equipment, specifically relating to a device for detecting sulfur dioxide residue in food. Background Technology

[0002] Sulfur dioxide, as a food additive, plays a role in food processing, including color protection, preservation, bleaching, and antioxidation. Small amounts of sulfur dioxide in food are converted into sulfates in the human body and excreted in urine, posing no health risk. However, excessive intake of sulfur dioxide may cause symptoms such as difficulty breathing, diarrhea, and vomiting, and can cause varying degrees of damage to the brain and other tissues.

[0003] The detection of sulfur dioxide in food is based on the national standard "National Food Safety Standard - Determination of Sulfur Dioxide in Food" (GB 5009.34-2022), mainly using acid-base titration, spectrophotometry, and ion chromatography. Acid-base titration is widely used due to its simple operation, low equipment requirements, and wide applicability. Before titration, the sample is distilled to evaporate the sulfur dioxide, which is then condensed and collected in a collection bottle for titration. However, distillation takes a relatively long time (ranging from ten to several tens of minutes). When processing large batches of samples, the distillation time significantly restricts subsequent titration, increasing sample processing stress and affecting detection efficiency.

[0004] For example, Chinese patent document CN219935785U discloses a sulfur dioxide measuring device, including a stepped measuring platform. The top of the platform has multiple heating tanks arranged side-by-side, each containing a distillation flask. A condenser tube is connected above each distillation flask. Each distillation flask contains a magnetic stir bar, and each heating tank has a magnetic stirrer on its outer side for cooperation with the magnetic stir bar. The condenser tube contains a zeolite plate, and the zeolite plate contains several zeolite-filled tubes. This invention is reasonably designed. By incorporating a magnetic stir bar and a magnetic stirrer, the distillation flask can be magnetically stirred. The structure is simple and facilitates effective stirring of the sample inside the distillation flask. Simultaneously, the zeolite-filled tubes inside the condenser tubes allow the zeolite inside to absorb excess heat, preventing sudden boiling over.

[0005] After distillation, the above-mentioned measuring apparatus requires the absorption bottles to be removed one by one and the distillation flasks, condensers and other equipment to be replaced before the pretreatment of the next batch of samples can be carried out. The operation is relatively troublesome and inefficient. Utility Model Content

[0006] This invention provides a device for detecting sulfur dioxide residue in food, which solves the technical problem that when sulfur dioxide in food is detected by acid-base titration, the absorption bottle must be removed one by one after the sample pretreatment distillation is completed, and the distillation flask, condenser and other equipment must be replaced before the next batch of samples can be processed. This is cumbersome and inefficient.

[0007] To solve the above technical problems, the present invention adopts the following technical solution:

[0008] A device for detecting sulfur dioxide residue in food includes a main unit and a heating zone on the main unit for placing distillation flasks. It further includes: a sampling assembly comprising: a base plate slidably connected to the bottom side of the main unit via a slot; placement areas spaced along the length of the base plate for placing collection bottles; a support rod assembly comprising: support rods located at both ends of the top of the main unit and on the side of the heating zone not near the base plate; a mounting plate on the support rods, with its length aligned with the length of the main unit; and clamps on the mounting plate for clamping condenser tubes. The top of the base plate, the top of the main unit, and the top of the support rods increase in height sequentially. The number of placement areas and clamps is the same as the number of heating zones.

[0009] Furthermore, this application also proposes that a limiting sleeve is provided on the side of the host near the base plate; the limiting sleeve is provided at intervals along the length direction of the host, and the number is consistent with the number of heating zones.

[0010] Furthermore, this application also proposes that the clamp is movably connected to the mounting plate so that the clamp can slide along the length direction of the mounting plate and be fixed in a suitable position.

[0011] Furthermore, this application also proposes that the support rod has spaced adjustment holes in the height direction so that the mounting plate can be fixed by a connector at a suitable position of the adjustment holes.

[0012] Furthermore, this application also proposes that the support rod assembly further includes: a crossbar, with both ends movably mounted on the support rod; a slider, mounted on the crossbar and slidable along the length of the crossbar; a connecting rod mounted on the slider; the crossbar is positioned above the mounting plate, and the connecting rod does not contact the mounting plate or the clamp.

[0013] Furthermore, this application also proposes that the sampling assembly further includes: support rods, which are movably disposed at both ends of the top of the base plate; the crossbar is movably connected to the support rods and is located above the placement area.

[0014] Furthermore, this application also proposes that the sampling assembly further includes: a storage slot disposed on the base plate; a slot cover hinged to the base plate to close or open the storage slot; the storage slot can hold the removed support rod.

[0015] Furthermore, this application also proposes that the storage slot is located outside the placement area and close to the host.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The base plate and the main unit are connected by a slotted sliding connection. After the sample distillation is completed, the base plate can be pushed to one side to separate it from the main unit. In this way, the base plate and the collection bottle on the placement area can be moved to other areas of the operating table for easy titration. Then, the spare base plate can be connected to the main unit, and after replacing and installing the distillation flask and other equipment, the next batch of samples can be distilled again, improving work efficiency.

[0018] 2. The limiting sleeve on the main unit can hold the collection tube in place, preventing the tubing from becoming messy when processing multiple samples at once, and ensuring a clean and orderly operating interface.

[0019] 3. The clamp is movably connected to the mounting plate. During use, the clamp can be slid to a suitable position on the mounting plate and fixed. The position of the clamp can be adjusted as needed to improve its flexibility and adaptability.

[0020] 4. The crossbar, slider, and connecting rod are designed to hold clamps such as butterfly clamps for holding the burette, allowing the base plate to be removed after distillation.

[0021] Remove the crossbar from the support rod and connect both ends to the support rod. You can use the connection method with the support rod. Slide the slider to the appropriate position and fix it. Then install the butterfly clamp on the connecting rod. The butterfly clamp clamps the burette and you can perform titration measurement. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is the front view of the present utility model.

[0024] Figure 2 This is a top view of the present invention.

[0025] Figure 3This is a schematic diagram showing the main unit and the base plate separated.

[0026] Figure 4 for Figure 2 A magnified view of part A.

[0027] Figure 5 This is a schematic diagram of the crossbars installed on the base plate.

[0028] Figure 6 This is a top view of the present invention (without a crossbar).

[0029] Reference numerals: 1-Main unit, 11-Heating zone, 12-Limiting sleeve, 2-Sampling component, 21-Base plate, 22-Placement area, 23-Support rod, 24-Storage slot, 25-Slot cover, 3-Support rod assembly, 31-Support rod, 32-Mounting plate, 33-Clamp, 34-Adjustment hole, 35-Crossbar, 36-Slider, 37-Connecting rod. Detailed Implementation

[0030] To facilitate a better understanding of this utility model, the following examples are provided in conjunction with the accompanying drawings. These examples fall within the protection scope of this utility model, but do not limit the protection scope of this utility model.

[0031] Example 1

[0032] A device for detecting sulfur dioxide residue in food, such as Figures 1-4 As shown, the system includes a main unit 1 and a heating zone 11 on the main unit 1 for placing distillation flasks. It also includes a sampling assembly 2, comprising: a base plate 21, slidably connected to the bottom side of the main unit 1 via a slot; a placement area 22, spaced along the length of the base plate 21, for placing collection bottles; and a support rod assembly 3, comprising: support rods 31, located at both ends of the top of the main unit 1 and on the side of the heating zone 11 not near the base plate 21; a mounting plate 32, mounted on the support rods 31, with its length direction aligned with the length direction of the main unit 1; and clamps 33, mounted on the mounting plate 32, for clamping condenser tubes. The top of the base plate 21, the top of the main unit 1, and the top of the support rods 31 increase in height sequentially. The number of placement areas 22 and clamps 33 is the same as the number of heating zones 11.

[0033] The main unit is equipped with a heating wire so that when the power is connected, the heating wire will run to heat and distill the distillation flask located in the heating zone; the heating zone is a concave, open-top circular area, which is convenient for placing the body of the distillation flask.

[0034] Since a condenser is needed to condense the distilled sulfur dioxide during the distillation process, a support rod, mounting plate, and clamp are provided to facilitate the fixing of the condenser. The clamp can be in the form of a hoop, and a soft layer made of materials such as sponge or soft cloth is provided in contact with the condenser to prevent scratching the condenser during use.

[0035] The placement area on the base plate is used to place the collection bottle to collect the condensed sulfur dioxide. This can be achieved by connecting the condenser tube and the collection bottle at both ends of the collection tube (silicone tube, etc.). Multiple placement areas can be set up, with the number matching that of the heating area. The placement area can be recessed slightly to better accommodate the collection bottle.

[0036] The base plate is movably connected to the side of the main unit, which facilitates the separation of the two after distillation and allows the base plate to be moved to the titration operating area for subsequent titration. The movable connection can use existing connection methods such as slots.

[0037] Before distillation, the airtightness of the pipeline should be checked according to the experimental operation specifications.

[0038] Instructions for use: Place the sample in a distillation flask, add reagents, and then place the distillation flask in the heating zone. Connect the condenser and secure it with clamps. Connect the inlet and outlet pipes of the cooling water. Place the collection bottle in the designated area, connecting one end of the collection tube to the condenser and extending the other end into the collection bottle. Introduce nitrogen and adjust the flow rate to purge air from the piping system. Start the main unit for heating and the condenser. The sulfur dioxide distilled from the sample will be condensed and enter the collection bottle. After distillation, turn off the main unit power, the condenser, and the nitrogen. Push out the base plate to separate it from the main unit and move it to a suitable operating area for subsequent titration analysis of the sulfur dioxide collected in the collection bottle.

[0039] The spare base plate can be reconnected to the main unit, then the clamps can be loosened, the condenser, distillation flask, and collection flask can be replaced, and the above operations can be repeated for distillation.

[0040] Example 2

[0041] like Figures 1-3 As shown, a limiting sleeve 12 is provided on the side of the main unit 1 near the base plate 21; the limiting sleeve 12 is provided at intervals along the length direction of the main unit 1, and the number is the same as the number of heating zones 11.

[0042] like Figures 1-4 As shown, the clamp 33 is movably connected to the mounting plate 32 so that the clamp 33 can slide along the length of the mounting plate 32 and be fixed in a suitable position.

[0043] like Figures 1-4 As shown, the support rod 31 has spaced adjustment holes 34 (not shown) in the height direction so that the mounting plate 32 can be fixed by the connector at the appropriate adjustment hole 34 position.

[0044] During distillation, a collecting tube is used to collect the sulfur dioxide obtained from distillation. One end of the collecting tube is connected to the condenser, and the other end is inserted into the collecting flask. To avoid the collecting tube becoming messy and affecting the operation, a limiting sleeve is used to fix it. The limiting sleeve is tubular with one side open, making it easy to insert the collecting tube. The limiting sleeve is elastic, making it easy to tighten the collecting tube.

[0045] The movable connection between the clamp and the mounting plate allows the clamp to slide along the length of the mounting plate, thereby adjusting the position of the clamp as needed to meet actual operational requirements. The connection between the clamp and the mounting plate can be made using existing methods such as bolts. When using bolts, loosen the bolts to allow sliding, and tighten them after reaching the appropriate position.

[0046] The support rod has spaced adjustment holes in the height direction, which can be used to fix the mounting plate at different height positions, so that the height position of the mounting plate can be flexibly adjusted to meet the actual operation requirements; the mounting plate can be fixed to the support rod by engaging the adjustment holes with a pin.

[0047] Example 3

[0048] like Figures 1-6 As shown, the support rod assembly 3 also includes: a crossbar 35, with both ends movably mounted on the support rod 31; a slider 36, mounted on the crossbar 35 and slidable along the length of the crossbar 35; a connecting rod 37 mounted on the slider 36; the crossbar 35 is located above the mounting plate 32, and the connecting rod 37 does not contact the mounting plate 32 or the clamp 33.

[0049] like Figures 1-6 As shown, the sampling assembly 2 also includes: support rods 23, which are movably mounted on both ends of the top of the base plate 21; and a crossbar 35, which is movably connected to the support rods 23 and is positioned above the placement area 22.

[0050] To avoid affecting operation, before titration, the crossbar can be placed on the support rod (the top of the support rod has a groove, and both ends of the crossbar are inserted into the groove) for temporary storage. The placement of the crossbar should not affect the use of the mounting plate and clamps below. The slider can slide along the crossbar, allowing the position of the connecting rod to be adjusted according to the titration needs, improving flexibility and adaptability. The sliding connection is the existing connection method, which can be adjusted using a screw. When the slider needs to be moved, the screw is loosened, and after moving it to the appropriate position, the screw is tightened to fix the slider on the crossbar.

[0051] The connecting rod can also be connected to the slider by means of a screw, which makes it easy to adjust the height of the connecting rod so that the butterfly clamp (existing titration butterfly clamp) can be installed in a suitable position; the butterfly clamp is used to clamp the burette and is a common experimental instrument for quantitative titration of sulfur dioxide in the collection bottle.

[0052] When titration is not being performed, the crossbar can be placed on the support rod for temporary storage to avoid affecting the use of the collection flask during distillation; the crossbar and the support rod can be connected by existing methods such as pin connection or slot connection, so that the crossbar can be easily removed when needed.

[0053] During titration, first separate the base plate from the main unit and move it to a suitable position; remove the crossbar from the support rod and connect both ends to the support rod using the existing method of pins; slide the slider to a suitable position and fix it in place; then install the butterfly clamp on the connecting rod, clamp the burette with the butterfly clamp, and titration measurement can be performed.

[0054] Example 4

[0055] like Figures 2-3 As shown, the sampling assembly 2 also includes: a storage slot 24, which is disposed on the base plate 21; a slot cover 25, which is hinged to the base plate 21 to close or open the storage slot 24; the storage slot 24 can hold the removed support rod 23.

[0056] like Figures 2-3 As shown, the storage slot 24 is located outside the placement area 22 and close to the host 1.

[0057] A storage slot is provided on the base plate. The size of the storage slot should be larger than the size of the support rod so that the support rod can be removed from the base plate and stored in the storage slot when not in use, keeping the testing device neat and orderly. The slot cover is connected to the base plate by a hinge, making it easy to open and close, facilitating the storage or removal of the support rod. When not in use, the slot cover should be closed to prevent debris from falling into the storage slot.

[0058] The host device involved in this invention is an existing device and is not the innovation of this application. The specific model is not described here. The installation, connection and use are all existing technologies.

[0059] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0060] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for detecting sulfur dioxide residue in food, comprising a main unit (1) and a heating zone (11) disposed on the main unit (1) for placing a distillation flask, characterized in that, Also includes: Sampling component (2), comprising: The base plate (21) is slidably connected to the bottom side of the host (1) via a slot; Placement area (22), spaced along the length of the base plate (21), is used to place collection bottles; Support assembly (3), including: Support rods (31) are respectively located at both ends of the top of the main unit (1) and are located on the side of the heating zone (11) that is not close to the base plate (21); Mounting plate (32) is provided on the support rod (31) and its length direction is consistent with the length direction of the host (1); A clamp (33) is provided on the mounting plate (32) for clamping the condenser tube; The top of the base plate (21), the top of the main unit (1), and the top of the support rod (31) increase in height sequentially. The number of the placement area (22) and the number of the clamps (33) are the same as the number of the heating area (11).

2. The device for detecting sulfur dioxide residue in food according to claim 1, characterized in that, The host (1) is provided with a limiting sleeve (12) on the side near the base plate (21); The limiting sleeves (12) are spaced apart along the length of the host (1), and the number is the same as the number of heating zones (11).

3. The device for detecting sulfur dioxide residue in food according to claim 2, characterized in that, The clamp (33) is movably connected to the mounting plate (32) so that the clamp (33) can slide along the length direction of the mounting plate (32) and be fixed in a suitable position.

4. The device for detecting sulfur dioxide residue in food according to claim 3, characterized in that, The support rod (31) has spaced adjustment holes (34) in the height direction so that the mounting plate (32) can be fixed by a connector at a suitable position of the adjustment hole (34).

5. A device for detecting sulfur dioxide residue in food according to any one of claims 1-4, characterized in that, The strut assembly (3) also includes: The crossbar (35) is movably mounted on the support rod (31) at both ends; A slider (36) is provided on the crossbar (35) and can slide along the length direction of the crossbar (35); The connecting rod (37) is mounted on the slider (36); The crossbar (35) is located above the mounting plate (32), and the connecting rod (37) does not contact the mounting plate (32) or the clamp (33).

6. The device for detecting sulfur dioxide residue in food according to claim 5, characterized in that, The sampling component (2) also includes: Support rods (23) are movably mounted on both ends of the top of the base plate (21); The crossbar (35) can be movably connected to the support rod (23) and is located above the placement area (22).

7. The device for detecting sulfur dioxide residue in food according to claim 6, characterized in that, The sampling component (2) also includes: Storage slot (24) is provided on the base plate (21); The trough cover (25) is hinged to the base plate (21) to close or open the storage trough (24); The storage slot (24) can hold the removed support rod (23).

8. The device for detecting sulfur dioxide residue in food according to claim 7, characterized in that, The storage slot (24) is located outside the placement area (22) and close to the host (1).

Images