A random sampling quality inspection device for milk powder production

Abstract

The invention discloses a random sampling quality inspection device for milk powder production, and relates to the technical field of milk powder inspection. The quality inspection device comprises a pretreatment device and a gas chromatograph, the pretreatment device comprises a fuselage, a shaker and a water bath distillation box are arranged inside the fuselage, a first treatment bottle is arranged on the shaker, a distillation bottle is arranged in the water bath distillation box, the gas chromatograph comprises a shell, a column temperature box is arranged inside the shell. Compared with the current milk powder quality inspection device, the invention is provided with a pretreatment device. On the one hand, the amount of milk powder sample poured out can be effectively controlled by the pretreatment device to prevent the risk of sample scattering during the process of pouring the milk powder sample. On the other hand, the purpose of automatically processing the milk powder sample can be achieved, and when there are many batches of milk powder, it is avoided that the staff needs to frequently pour out the milk powder sample for processing, thereby reducing the risk of contamination of the milk powder sample.

Description

Technical Field

[0001] The invention relates to the technical field of milk powder detection, in particular to a random sampling quality detection device for milk powder production. Background Art

[0002] In order to ensure the quality of milk powder, each batch of milk powder needs to be randomly sampled and tested during the production process. Nowadays, companies usually use the following equipment to test the quality of milk powder: liquid chromatograph, gas chromatograph, atomic fluorescence spectrophotometer, atomic absorption spectrophotometer, etc.

[0003] At present, in order to ensure the working efficiency of the gas chromatograph, some chromatographs sometimes set cooling pipes and other structures inside the gas chromatograph to accelerate the temperature change inside the gas chromatograph. For example, the patent "CN113702528A gas chromatograph" discloses a technical solution for quickly reducing the internal temperature of the gas chromatograph. However, in actual application, this technical solution has the defects of water leakage and uneven heat dissipation on the one hand, and is easily disturbed by the external environment on the other hand, which affects subsequent use. Finally, when testing the quality of milk powder, the milk powder sample often needs to undergo a series of pretreatments first, for example, the milk powder sample After weighing, various reagents must be added and shaken to mix well. Finally, after dehydration, concentration, volume adjustment and purification, it can be transported to the gas chromatograph for detection. The above pretreatment steps are usually performed manually in enterprises. Once this operation method encounters situations such as too many batches of milk powder, it will expose many disadvantages. First, the efficiency of manual operation is extremely low, and a lot of time is spent on repeated pouring, stirring and other actions, which seriously affects the overall detection progress. Secondly, manual operation cannot guarantee the accuracy of each pouring. Whether it is the amount of reagent added or the amount of milk powder sample transferred, there may be slight differences, which in turn affects subsequent detection. Summary of the Invention

[0004] The object of the present invention is to provide a random sampling quality detection device for milk powder production to solve the problems raised in the prior art.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a random sampling quality inspection device for milk powder production, the quality inspection device comprising a pretreatment device and a gas chromatograph, the pretreatment device comprising a body, a shaker and a water bath distillation box provided inside the body, a first treatment bottle provided on the shaker, a distillation bottle provided inside the water bath distillation box, the gas chromatograph comprising an outer shell, a column oven provided inside the outer shell, a diverter disk, a chromatographic tube and a fan provided inside the column oven, the diverter disk being provided with two groups, the two groups of diverter disks They are respectively arranged at the upper and lower ends of the interior of the column oven, the chromatographic tube is arranged at the middle position of the interior of the column oven, the fan blade is arranged on the side of the interior of the column oven away from the box door, a connector and a feed port are arranged on the top of the shell, one end of the chromatographic tube is connected to the detection system through the connector, and the other end of the chromatographic tube is connected to the feed port, a temperature control box is further arranged on the outside of the shell, a temperature control mechanism and a third motor are arranged inside the temperature control box, and the third motor is connected to the fan blade. Before the milk powder is tested, the staff needs to randomly extract the milk powder from the production process. The milk powder sample is then placed in a first processing bottle, and then acetone is added and shaken, sodium chloride is shaken and shaken, and petroleum ether is shaken and shaken in sequence. After the solution in the first processing bottle is allowed to stand and separate, the staff can dehydrate the supernatant in the first processing bottle and send it to a distillation bottle for concentration to near dryness. Finally, the volume is made up with petroleum ether and purified with concentrated sulfuric acid. After a series of shaking and centrifugation treatments, the supernatant is taken and transported to a chromatographic tube. The components in the milk powder sample are separated and detected by the chromatographic tube and the detection system. When the gas chromatograph of the present invention is working, the gas chromatograph is used. The fan blades control the gas inside the gas chromatograph to flow along the temperature control mechanism-dividing disk-temperature control mechanism, and the chromatographic tube is evenly heated by the temperature control mechanism. When the gas chromatograph finishes working, the temperature control mechanism evenly dissipates the heat of the chromatographic tube. Compared with the current heat dissipation by water cooling or by extracting the hot air in the column oven, the present invention does not need to consider the risks of water leakage on the one hand, and on the other hand avoids the risk of local deformation of the chromatographic tube caused by uneven heat dissipation. Finally, the present invention can also prevent the internal area of ​​the column oven from being contaminated by external gas during the heat dissipation process.

[0006] Furthermore, a pretreatment tank is provided above the fuselage, and the pretreatment tank is provided with three groups, one of which contains acetone, another contains sodium chloride, and the last contains petroleum ether. A lifting seat is also provided inside the fuselage, and a second treatment bottle is provided inside the lifting seat, and anhydrous sodium sulfate is provided inside the second treatment bottle. A five-way pipe is provided above the first treatment bottle, one end of the five-way pipe is aligned with the first treatment bottle, and the other end of the five-way pipe is aligned with the second treatment bottle, and the remaining end of the five-way pipe is aligned with the first treatment bottle. The three ends are connected to three groups of pretreatment tanks respectively. The shaker is movably installed in the fuselage through the first cylinder. The lifting seat is movably installed in the fuselage through the second cylinder. The fuselage is also provided with a first infusion tube and a second infusion tube. The second treatment bottle is connected to the distillation bottle through the first infusion tube. The distillation bottle is connected to the feed port through the second infusion tube and the hose. The end of the five-way pipe close to the second treatment bottle is provided with a first liquid pump, the first infusion tube is provided with a second liquid pump, and the second infusion tube is provided with a third liquid pump. The bottom of each group of pretreatment tanks in the present invention is A set of valves is provided. After placing the milk powder sample in the first processing bottle, the staff can open the valves under the three sets of pre-treatment tanks in sequence as needed, so that acetone, sodium chloride and petroleum ether can enter the first processing bottle in sequence. After standing and stratification, the staff can use the first cylinder to drive the shaker and the first processing bottle to rise, so that one end of the five-way pipe is inserted into the first processing bottle, and then start the first liquid pump to transfer the supernatant in the first processing bottle to the second processing bottle for dehydration (in order to ensure the dehydration effect, it needs to be changed every time the milk powder sample is tested). Replace the anhydrous sodium sulfate in the second treatment bottle). When the dehydration treatment is completed, the milk powder sample in the second treatment bottle is transported to the distillation bottle for concentration through the second liquid pump. When the milk powder sample is concentrated, the staff can take out the distillation bottle and add petroleum ether to make up the volume, add concentrated sulfuric acid for purification, and finally after a series of shaking and centrifugation treatments, the supernatant is transported to the chromatographic tube. Compared with the current method of pouring milk powder samples by manual operation, the present invention can effectively control the amount of milk powder samples poured out through the above technical solution, and at the same time prevent the risk of sample spillage during the process of pouring the milk powder samples.

[0007] Furthermore, the water bath distillation box is movably mounted in the fuselage through a third cylinder, a mounting frame is provided above the distillation flask, a rotating mechanism and a clamping assembly are provided in the mounting frame, and the distillation flask is connected to the rotating mechanism through the clamping assembly. Through the above technical solution, the present invention can drive the distillation flask to rotate in the water bath distillation box through the rotating mechanism when the milk powder sample is concentrated, so that the milk powder sample in the distillation flask is evenly heated. When the milk powder sample is concentrated, the staff can directly open the third cylinder to separate the water bath distillation box and the distillation flask through the third cylinder. Then, without removing the distillation flask, petroleum ether can be directly added to the distillation flask to make the volume, and concentrated sulfuric acid can be added for purification. The distillation flask is controlled to rotate at high speed by the rotating mechanism to achieve shaking and centrifugation. Finally, the supernatant in the distillation flask is transported to the chromatographic tube by the third liquid pump. Compared with the current manual operation method for processing milk powder samples, the present invention can control the movement of various electrical equipment in the pretreatment device through PLC to achieve the purpose of automatically processing milk powder samples, avoiding the need for staff to frequently pour out milk powder samples when there are many batches of milk powder.

[0008] Furthermore, an end cap is provided at the upper end of the first processing bottle, a through slot is provided at the middle position of the end cap, a movable plate is provided below the through slot, the movable plate is movably connected to the end cap via a rotating shaft, and a volute spring is provided at the side end of the rotating shaft. Through the above technical solution, when acetone, sodium chloride or petroleum ether needs to be added to the first processing bottle, the first cylinder will first drive the shaker to move upward until the five-way tube is inserted into the end cap near one end of the first processing bottle and the movable plate is pushed open, and then the corresponding pretreatment tank will transport acetone, sodium chloride or petroleum ether into the first processing bottle. After the corresponding reagents are transported, the first cylinder will drive the shaker to move downward until the five-way tube is close to one end of the first processing bottle and comes out of the end cap. At this time, under the action of the volute spring, the movable plate automatically resets to prevent the milk powder sample from splashing out of the first processing bottle when the subsequent shaker oscillates the first processing bottle.

[0009] Furthermore, the rotating mechanism includes a transmission gear and a first motor, and the clamping assembly includes a clamping seat and a clamping block. The transmission gear is provided with several groups, and several groups of transmission gears are evenly arranged on the upper side of the clamping seat. The upper end of the clamping seat is provided with teeth, and the first motor is connected to one of the transmission gears. The clamping blocks are provided with two groups, and each group of clamping blocks is movably installed inside the clamping seat through a compression spring. The distillation flask is clamped and fixed by two groups of clamping blocks. When the milk powder sample is concentrated, the first motor drives the clamping seat and the distillation flask to rotate at a lower speed so that the milk powder sample in the distillation flask is evenly heated. When the milk powder sample is concentrated, the first motor drives the clamping seat and the distillation flask to rotate at a higher speed, thereby achieving the purpose of shaking and centrifuging. Through the above technical solution, the present invention achieves the purpose of multi-purpose use of one machine, while reducing the risk of contamination caused by pouring the milk powder sample back and forth.

[0010] Furthermore, a through hole is provided at the bottom end of the distillation flask, a drain pipe is provided below the distillation flask, the drain pipe is aligned with the through hole, a sealing plug is provided in the drain pipe, a drainage hole is provided at the side end of the drain pipe, a mounting seat is provided below the drain pipe, an electromagnet is provided in the mounting seat, the bottom of the sealing plug and the top of the electromagnet are connected by a sealing spring, and the end of the sealing plug close to the electromagnet is magnetic. When the milk powder sample is pretreated in the present invention, the sealing plug always blocks the through hole at the bottom of the distillation flask. After the inspection of a batch of milk powder samples is completed, the staff can connect the end of the five-way tube close to the first processing bottle to the cleaning liquid delivery system, and connect the end of the second infusion tube away from the distillation flask to the cleaning liquid recovery system, and finally connect the five-way tube and the first infusion tube to each other. The close end is connected by a hose, and the cleaning liquid is transported into the five-way pipe through the cleaning liquid delivery system, and the cleaning liquid is delivered to the cleaning liquid recovery system through the first liquid pump, the second liquid pump and the third liquid pump. During the flow of the cleaning liquid in the pretreatment device, the five-way pipe, the first infusion tube, the second infusion tube, the first liquid pump and the second liquid pump will be cleaned, so as to avoid the subsequent batches of milk powder samples from being contaminated by the previous batch of milk powder samples. When the cleaning operation is completed, the staff can turn on the electromagnet and the first motor, drive the sealing plug away from the through hole through the electromagnet, and drive the distillation flask to rotate through the first motor. At this time, the cleaning liquid remaining in the distillation flask will quickly flow to the outside along the through hole-drainage hole. The above technical solution can prevent the subsequent concentration efficiency from becoming low on the one hand, and avoid the staff from wiping and cleaning the distillation flask on the other hand.

[0011] Furthermore, the temperature control mechanism includes a temperature control tank, in which heating tubes and baffles are arranged. The baffles are arranged in several groups, and the baffles in several groups are annular structures. The cross-sections of several groups of baffles are wavy structures. The heating tubes are arranged in several groups, and the heating tubes are evenly arranged between the baffles. One end of the temperature control tank is connected to the column temperature box through the air inlet channel, and the upper and lower sides of the other end of the temperature control tank are connected to the two groups of diverter disks through two groups of conduits. When the gas chromatograph in the present invention is working, the fan blades control the gas inside the gas chromatograph to flow along the air inlet channel-temperature control tank-diverter disk-air inlet channel. Since there are several groups of baffles in the temperature control tank and several groups of heating tubes are arranged between the baffles, the gas will be heated during the flow, so that the chromatographic tube can separate the components in the milk powder sample.

[0012] Furthermore, each group of the baffles is inlaid with several groups of refrigeration elements on the inner and outer walls, and a temperature detection element is provided in the column oven. After the work of the gas chromatograph of the present invention is completed, the staff can close the several groups of heating tubes and open the several groups of refrigeration elements inlaid on the inner and outer walls of the baffles. When the fan blades control the gas inside the gas chromatograph to flow along the air inlet channel-temperature control tank-dividing plate-air inlet channel, the flowing gas is cooled by the several groups of refrigeration elements, so that the inside of the column oven can quickly dissipate heat. Compared with the current heat dissipation through water cooling or by extracting the hot air from the column oven, the refrigeration elements in the present invention are placed outside the column oven. Even if cracks occur, it will not affect the operation of the gas chromatograph. On the other hand, the two groups of diverter plates can be used to evenly dissipate heat to the chromatographic tube to prevent local deformation of the chromatographic tube due to uneven heat dissipation. Finally, the present invention can be in a sealed environment throughout the entire heat dissipation process, thereby preventing the internal area of ​​the column oven from being contaminated by external gas during the heat dissipation process.

[0013] Furthermore, an air inlet is provided at the side end of the diverter disk, and the air inlet is connected to the conduit. An air outlet is provided at one end of the diverter disk close to the chromatographic tube. A dehumidification rack is provided inside the diverter disk, and the dehumidification rack is filled with a desiccant. When the humidity of the external environment is relatively high, the present invention can suspend heating the gas in the column oven before working, and only allow the gas in the column oven to flow along the air inlet channel-temperature control tank-diverter disk-air inlet channel. When the gas in the column oven flows through the dehumidification rack in the diverter disk, the moisture in the column oven is absorbed by the desiccant in the dehumidification rack, which, on the one hand, prevents the subsequent operation of the gas chromatograph from being affected, and on the other hand, avoids the appearance of water droplets on the refrigeration element during the cooling process of the column oven after the gas chromatograph is finished working.

[0014] Furthermore, a second motor is provided at one end of the diverter plate away from the chromatographic tube, the dehumidification rack is an arc-shaped structure, and a turntable is provided at one end of the dehumidification rack close to the second motor, and the turntable is connected to the second motor. When the external environment is relatively dry, the turntable and the dehumidification rack are driven to rotate by the second motor to make the dehumidification rack away from the air inlet, thereby increasing the gas flow rate in the column oven.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: compared with the current milk powder quality testing equipment, the present invention is provided with a pretreatment device, which can effectively control the amount of milk powder samples poured out through the pretreatment device on the one hand, thereby preventing the risk of sample spillage during the process of pouring the milk powder samples; on the other hand, it can achieve the purpose of automatically processing milk powder samples, thereby avoiding the need for staff to frequently pour out milk powder samples when there are many batches of milk powder, thereby reducing the risk of milk powder samples being contaminated; after the inspection of a certain batch of milk powder samples is completed, the present invention can allow the cleaning liquid to flow in the pretreatment device through the first liquid pump, the second liquid pump and the third liquid pump; during the flow of the cleaning liquid, the five-way pipe, the first infusion pipe, the second infusion pipe, the first liquid pump and the second liquid pump are cleaned, thereby preventing subsequent batches of milk powder samples from being contaminated by the previous batch of milk powder samples; the present invention is also provided with a temperature control mechanism, compared with the current heat dissipation through water cooling or through the extraction column The hot air in the temperature box is dissipated. On the one hand, the present invention does not need to consider risks such as water leakage, and on the other hand, it avoids risks such as local deformation of the chromatographic tube caused by uneven heat dissipation. In addition, the temperature control mechanism of the present invention can be kept in a sealed environment throughout the entire working process, thereby preventing the internal area of ​​the column temperature box from being contaminated by external gas during the heat dissipation process. Finally, the present invention is also provided with a second motor and a dehumidification rack. When the humidity of the external environment is relatively high, the dehumidification rack is driven by the second motor to approach the air inlet. When the gas in the column temperature box flows through the dehumidification rack in the diverter disk, the moisture in the column temperature box is absorbed by the desiccant in the dehumidification rack, on the one hand, preventing the subsequent gas chromatograph from being affected, and on the other hand, avoiding the formation of water droplets on the refrigeration element during the cooling process of the column temperature box after the gas chromatograph is finished working. When the external environment is relatively dry, the turntable and the dehumidification rack are driven to rotate by the second motor to make the dehumidification rack away from the air inlet, thereby increasing the gas flow rate in the column temperature box. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the internal structure of the gas chromatograph of the present invention from a first perspective;

[0018] Figure 3 Schematic diagram of the internal structure of the pretreatment device of the present invention;

[0019] Figure 4This is a schematic diagram of the end cap structure of the first processing bottle of the present invention;

[0020] Figure 5 It is a schematic structural diagram of the rotating mechanism and the clamping assembly of the present invention;

[0021] Figure 6 For the present invention Figure 5 Schematic diagram of the structure of the middle part A;

[0022] Figure 7 This is a schematic diagram of the internal structure of the gas chromatograph of the present invention from a first perspective;

[0023] Figure 8 This is a schematic diagram of the connection structure between the temperature control box and the diverter plate of the present invention;

[0024] Figure 9 Schematic diagram of the internal structure of the temperature control box of the present invention;

[0025] Figure 10 This is a schematic structural diagram of the diverter plate of the present invention;

[0026] Figure 11 It is a cross-sectional schematic diagram of the diverter plate of the present invention.

[0027] In the figure: 1. Pretreatment device; 11. Main body; 111. Five-way pipe; 112. First infusion pipe; 113. Second infusion pipe; 114. First cylinder; 115. Second cylinder; 116. Third cylinder; 12. First treatment bottle; 121. End cover; 122. Rotating shaft; 123. Movable plate; 13. Pretreatment tank; 14. Shaker; 15. Second treatment bottle; 16. Lifting seat; 17. Water bath distillation box; 18. Distillation flask; 181. Sealing plug; 182. Drain pipe; 183. Drain hole; 184. Mounting seat; 185. Electric Magnet; 19. Mounting frame; 191. Clamping seat; 192. Transmission gear; 193. Clamping block; 194. First motor; 2. Gas chromatograph; 21. Housing; 22. Connector; 23. Diverter plate; 231. Second motor; 232. Turntable; 233. Air inlet; 234. Dehumidification rack; 235. Air outlet; 24. Chromatographic tube; 25. Column oven; 26. Feed port; 27. Fan blade; 28. Temperature control box; 281. Heating tube; 282. Baffle; 283. Temperature control tank; 284. Air inlet channel; 285. Third motor. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] Example: Figures 1-10 As shown, the present invention provides a technical solution, a random sampling quality inspection equipment for milk powder production, the quality inspection equipment includes a pretreatment device 1 and a gas chromatograph 2, the pretreatment device 1 includes a body 11, the interior of the body 11 is provided with a shaker 14 and a water bath distillation box 17, the shaker 14 is provided with a first processing bottle 12, the water bath distillation box 17 is provided with a distillation bottle 18, the gas chromatograph 2 includes a shell 21, the interior of the shell 21 is provided with a column oven 25, the interior of the column oven 25 is provided with a diverter disk 23, a chromatographic tube 24 and a fan blade 27, the diverter disk 23 is provided with two groups, and the two groups of diverter disks 23 are divided The column temperature box 25 is provided with a chromatographic tube 24 at the upper and lower ends thereof, the column temperature box 25 is provided with a chromatographic tube 24 at the middle position thereof, the fan 27 is provided on the side of the column temperature box 25 away from the door, the upper part of the shell 21 is provided with a connector 22 and a feed port 26, one end of the chromatographic tube 24 is connected to the detection system through the connector 22, the other end of the chromatographic tube 24 is connected to the feed port 26, the outside of the shell 21 is further provided with a temperature control box 28, the interior of the temperature control box 28 is provided with a temperature control mechanism and a third motor 285, the third motor 285 is connected to the fan 27, and the milk powder is tested before the staff randomly draws raw milk powder. The milk powder sample in the production process is then placed in the first processing bottle 12, and then acetone is added and shaken, sodium chloride is shaken and shaken, and petroleum ether is shaken and shaken. After the solution in the first processing bottle 12 is allowed to stand and stratify, the staff can dehydrate the supernatant in the first processing bottle 12 and send it to the distillation bottle 18 for concentration to dryness, and finally make the volume with petroleum ether and purify it with concentrated sulfuric acid. After a series of shaking and centrifugation treatments, the supernatant is taken and transported to the chromatographic tube 24. The components in the milk powder sample are separated and detected by the chromatographic tube 24 and the detection system. When the gas chromatograph 2 of the present invention is working, The fan blades 27 control the gas inside the gas chromatograph 2 to flow along the temperature control mechanism-diverter disk 23-temperature control mechanism, and the chromatographic tube 24 is evenly heated by the temperature control mechanism. When the gas chromatograph 2 finishes working, the chromatographic tube 24 is evenly cooled by the temperature control mechanism. Compared with the current heat dissipation by water cooling or by extracting the hot air in the column oven 25, the present invention does not need to consider risks such as water leakage on the one hand, and on the other hand avoids the risk of local deformation of the chromatographic tube 24 caused by uneven heat dissipation. Finally, the present invention can also prevent the internal area of ​​the column oven 25 from being contaminated by external gas during the heat dissipation process.

[0030] like Figures 1-10As shown, a pretreatment tank 13 is provided above the fuselage 11, and the pretreatment tank 13 is provided with three groups, wherein one group of pretreatment tanks 13 contains acetone, another group of pretreatment tanks 13 contains sodium chloride, and the last group of pretreatment tanks 13 contains petroleum ether. A lifting seat 16 is also provided inside the fuselage 11, and a second treatment bottle 15 is provided inside the lifting seat 16. Anhydrous sodium sulfate is provided inside the second treatment bottle 15. A five-way pipe 111 is provided above the first treatment bottle 12, and one end of the five-way pipe 111 is aligned with the first treatment bottle 12, and the other end of the five-way pipe 111 is aligned with the second treatment bottle 15. The remaining three ends of the five-way pipe 111 are aligned with each other. The ends are respectively connected to the three groups of pretreatment tanks 13, the shaker 14 is movably installed in the fuselage 11 through the first cylinder 114, the lifting seat 16 is movably installed in the fuselage 11 through the second cylinder 115, and the fuselage 11 is further provided with a first infusion pipe 112 and a second infusion pipe 113. The second treatment bottle 15 is connected to the distillation bottle 18 through the first infusion pipe 112, and the distillation bottle 18 is connected to the feed port 26 through the second infusion pipe 113 and the hose. A first liquid pump is provided at one end of the five-way pipe 111 near the second treatment bottle 15, a second liquid pump is provided on the first infusion pipe 112, and a third liquid pump is provided on the second infusion pipe 113. A set of valves is provided under each set of pretreatment tanks 13. After placing the milk powder sample in the first treatment bottle 12, the staff can open the valves under the three sets of pretreatment tanks 13 in sequence as needed, so that acetone, sodium chloride and petroleum ether can enter the first treatment bottle 12 in sequence. After standing and stratifying, the staff can drive the shaker 14 and the first treatment bottle 12 to rise through the first cylinder 114, so that one end of the five-way pipe 111 is inserted into the first treatment bottle 12, and then start the first liquid pump to transport the supernatant in the first treatment bottle 12 to the second treatment bottle 15 for dehydration (in order to ensure the dehydration effect, The anhydrous sodium sulfate in the second processing bottle 15 needs to be replaced each time the milk powder sample is tested). After the dehydration treatment is completed, the milk powder sample in the second processing bottle 15 is transported to the distillation bottle 18 for concentration through the second liquid pump. When the milk powder sample is concentrated, the staff can take out the distillation bottle 18 and add petroleum ether to make it volume, add concentrated sulfuric acid for purification, and finally, after a series of shaking and centrifugation treatments, the supernatant is taken and transported to the chromatographic tube 24. Compared with the current manual operation method of pouring out the milk powder sample, the present invention can effectively control the amount of milk powder sample poured out through the above technical solution, and at the same time prevent the risk of sample spillage during the process of pouring out the milk powder sample.

[0031] like Figure 3 、 Figure 5As shown, the water bath distillation box 17 is movably mounted in the fuselage 11 through the third cylinder 116. A mounting frame 19 is provided above the distillation flask 18. A rotating mechanism and a clamping assembly are provided in the mounting frame 19. The distillation flask 18 is connected to the rotating mechanism through the clamping assembly. Through the above technical solution, when the milk powder sample is concentrated, the distillation flask 18 can be driven to rotate in the water bath distillation box 17 by the rotating mechanism, so that the milk powder sample in the distillation flask 18 is evenly heated. When the milk powder sample is concentrated, the staff can directly open the third cylinder 116 to make the water bath distillation box 17 and the distillation flask 18 rotate. The distillation flask 18 is separated, and then petroleum ether can be directly added to the distillation flask 18 to make up the volume without taking out the distillation flask 18, and concentrated sulfuric acid is added for purification. The distillation flask 18 is controlled to rotate at high speed by the rotating mechanism to achieve shaking and centrifugation, and finally the supernatant in the distillation flask 18 is transported to the chromatographic tube 24 by the third liquid pump. Compared with the current manual operation method for processing milk powder samples, the present invention can control the movement of various electrical equipment in the pretreatment device 1 through PLC to achieve the purpose of automatically processing milk powder samples, avoiding the need for staff to frequently pour out milk powder samples when there are many batches of milk powder.

[0032] like Figure 4 As shown, the upper end of the first processing bottle 12 is provided with an end cap 121, a through slot is provided in the middle position of the end cap 121, and a movable plate 123 is provided below the through slot. The movable plate 123 is movably connected to the end cap 121 through a rotating shaft 122, and a volute spring is provided at the side end of the rotating shaft 122. Through the above technical solution, when acetone, sodium chloride or petroleum ether needs to be added to the first processing bottle 12, the first cylinder 114 will first drive the shaker 14 to move upward until the five-way pipe 111 is close to one end of the first processing bottle 12 and inserted into the end The cover 121 is inserted and the movable plate 123 is pushed open. Then, the corresponding pretreatment tank 13 will transport acetone, sodium chloride or petroleum ether into the first treatment bottle 12. After the corresponding reagents are transported, the first cylinder 114 will drive the shaker 14 to move downward until the end of the five-way pipe 111 close to the first treatment bottle 12 comes out of the end cover 121. At this time, under the action of the spiral spring, the movable plate 123 is automatically reset to prevent the milk powder sample from splashing out of the first treatment bottle 12 when the subsequent shaker 14 oscillates the first treatment bottle 12.

[0033] like Figure 5As shown, the rotating mechanism includes a transmission gear 192 and a first motor 194, the clamping assembly includes a clamping seat 191 and a clamping block 193, the transmission gear 192 is provided with several groups, and several groups of transmission gears 192 are evenly arranged on the upper side of the clamping seat 191, and the upper end of the clamping seat 191 is provided with teeth, the first motor 194 is connected to one group of transmission gears 192, and the clamping block 193 is provided with two groups, each group of clamping blocks 193 is movably installed in the interior of the clamping seat 191 through a compression spring, and the two groups of clamping blocks 193 are used to move the clamping block 193. 3. Clamping and fixing the distillation flask 18. When concentrating the milk powder sample, the first motor 194 drives the clamping base 191 and the distillation flask 18 to rotate at a relatively low speed so that the milk powder sample in the distillation flask 18 is evenly heated. When the milk powder sample is concentrated, the first motor 194 drives the clamping base 191 and the distillation flask 18 to rotate at a relatively high speed, thereby achieving the purpose of shaking and centrifuging. Through the above technical solution, the present invention achieves the purpose of multi-purpose use of one machine, while reducing the risk of contamination caused by pouring the milk powder sample back and forth.

[0034] like Figure 5 、 Figure 6As shown, a through hole is provided at the bottom end of the distillation flask 18, a drain pipe 182 is provided below the distillation flask 18, the drain pipe 182 is aligned with the through hole, a sealing plug 181 is provided in the drain pipe 182, a drainage hole 183 is provided at the side end of the drain pipe 182, a mounting seat 184 is provided below the drain pipe 182, an electromagnet 185 is provided in the mounting seat 184, the bottom of the sealing plug 181 and the top of the electromagnet 185 are connected by a sealing spring, and the end of the sealing plug 181 close to the electromagnet 185 is magnetic. When the milk powder sample is pretreated in the present invention, the sealing plug 181 always blocks the through hole at the bottom of the distillation flask 18. After the inspection of a batch of milk powder samples is completed, the staff can connect the end of the five-way pipe 111 close to the first processing bottle 12 to the cleaning liquid delivery system, and connect the end of the second infusion pipe 113 away from the distillation flask 18 to the cleaning liquid recovery system. Finally, the five-way pipe 111 and the first infusion pipe 113 are connected. 2 are connected to each other through a hose, and the cleaning liquid is transported into the five-way pipe 111 through the cleaning liquid delivery system, and the cleaning liquid is transported to the cleaning liquid recovery system through the first liquid pump, the second liquid pump and the third liquid pump. During the flow of the cleaning liquid in the pretreatment device 1, the five-way pipe 111, the first infusion pipe 112, the second infusion pipe 113, the first liquid pump and the second liquid pump are cleaned, thereby preventing the subsequent batch of milk powder samples from being contaminated by the previous batch of milk powder samples. When the cleaning operation is completed, the staff can turn on the electromagnet 185 and the first motor 194, and drive the sealing plug 181 away from the through hole through the electromagnet 185, and drive the distillation flask 18 to rotate through the first motor 194. At this time, the cleaning liquid remaining in the distillation flask 18 will quickly flow to the outside along the through hole-drain hole 183. The above technical solution not only prevents the subsequent concentration efficiency from being reduced, but also avoids the staff from wiping and cleaning the distillation flask 18.

[0035] like Figure 7-Figure 9As shown, the temperature control mechanism includes a temperature control tank 283, in which a heating tube 281 and a baffle 282 are provided. The baffle 282 is provided in several groups, and the baffles 282 are all annular in structure. The cross-section of the baffles 282 is a wavy structure. The heating tube 281 is provided in several groups, and the heating tubes 281 are evenly arranged between the baffles 282. One end of the temperature control tank 283 is connected to the column temperature box 25 through the air inlet channel 284, and the other end of the temperature control tank 283 is connected to the column temperature box 25 through the air inlet channel 284. The two groups of conduits are connected to the two groups of diverter disks 23. When the gas chromatograph 2 of the present invention is working, the fan blades 27 are used to control the gas inside the gas chromatograph 2 to flow along the air inlet channel 284-temperature control tank 283-diverter disk 23-air inlet channel 284. Since several groups of baffles 282 are arranged in the temperature control tank 283, and several groups of heating tubes 281 are arranged between the several groups of baffles 282, the gas will be heated during the flow process, thereby allowing the chromatographic tube 24 to separate the components in the milk powder sample.

[0036] like Figure 7 、 Figure 9 As shown, the inner and outer walls of each set of baffles 282 are inlaid with several sets of refrigeration elements, and a temperature detection element is provided in the column oven 25. After the work of the gas chromatograph 2 of the present invention is completed, the staff can close the several sets of heating tubes 281 and open the several sets of refrigeration elements inlaid on the inner and outer walls of the baffles 282. When the fan blades 27 control the gas inside the gas chromatograph 2 to flow along the air inlet channel 284-temperature control tank 283-dividing plate 23-air inlet channel 284, the flowing gas is cooled by the several sets of refrigeration elements, thereby making the column oven 25 cooler. The interior of the temperature box 25 can dissipate heat quickly. Compared with the current heat dissipation through water cooling or by extracting the hot air in the column temperature box 25, the refrigeration element in the present invention is placed outside the column temperature box 25. Even if it breaks, it will not affect the operation of the gas chromatograph 2. On the other hand, the two groups of diverter plates 23 can be used to evenly dissipate heat to the chromatographic tube 24, preventing the chromatographic tube 24 from local deformation due to uneven heat dissipation. Finally, the present invention can be kept in a sealed environment throughout the entire heat dissipation process, thereby preventing the internal area of ​​the column temperature box 25 from being contaminated by external gas during the heat dissipation process.

[0037] like Figure 9 、 Figure 10As shown, the side end of the diverter disk 23 is provided with an air inlet 233, and the air inlet 233 is connected to the conduit. The diverter disk 23 is provided with an air outlet 235 at one end close to the chromatographic tube 24. The interior of the diverter disk 23 is provided with a dehumidification rack 234, and the dehumidification rack 234 is filled with a desiccant. When the humidity of the external environment is relatively high, the present invention can pause heating the gas in the column oven 25 before working, and only allow the gas in the column oven 25 to flow along the air inlet channel 284-temperature control tank 283-diverter disk 23-air inlet channel 284. When the gas in the column oven 25 flows through the dehumidification rack 234 in the diverter disk 23, the moisture in the column oven 25 is absorbed by the desiccant in the dehumidification rack 234. On the one hand, it prevents the subsequent operation of the gas chromatograph 2 from being affected. On the other hand, it avoids the appearance of water droplets on the refrigeration element during the cooling process of the column oven 25 after the gas chromatograph 2 is finished working.

[0038] like Figure 9 、 Figure 10 As shown, a second motor 231 is provided at one end of the diverter disk 23 away from the chromatographic tube 24, the dehumidification rack 234 is an arc-shaped structure, and a turntable 232 is provided at one end of the dehumidification rack 234 close to the second motor 231. The turntable 232 is connected to the second motor 231. When the external environment is relatively dry, the turntable 232 and the dehumidification rack 234 are driven to rotate by the second motor 231 to make the dehumidification rack 234 away from the air inlet 233, thereby increasing the gas flow rate in the column oven 25.

[0039] The working principle of the present invention is as follows: before the milk powder is tested, the staff needs to randomly extract milk powder samples from the production process, and then place the milk powder samples in the first processing bottle 12, and then open the valves under the three groups of pretreatment tanks 13 in sequence as needed, so that acetone, sodium chloride and petroleum ether can enter the first processing bottle 12 in order. After standing and stratification, the first cylinder 114 drives the shaker 14 and the first processing bottle 12 to rise, and the first liquid pump is used to transport the supernatant in the first processing bottle 12 to the second processing bottle 15 for dehydration. After the dehydration process is completed, the milk powder sample in the second processing bottle 15 is transported to the distillation bottle 18 for concentration through the second liquid pump. After the milk powder sample is concentrated, the water bath distillation box 17 and the third cylinder 116 are connected. The distillation flask 18 is separated, and then petroleum ether is directly added into the distillation flask 18 to make up the volume, and concentrated sulfuric acid is added for purification. The distillation flask 18 is controlled to rotate at high speed by the rotating mechanism to achieve shaking and centrifugation. Finally, the supernatant in the distillation flask 18 is transported to the chromatographic tube 24 by the third liquid pump. The components in the milk powder sample are separated and detected by the chromatographic tube 24 and the detection system. When the gas chromatograph 2 is working, the fan blades 27 control the gas inside the gas chromatograph 2 to flow along the temperature control mechanism-diverter disk 23-temperature control mechanism, and the chromatographic tube 24 is evenly heated by the temperature control mechanism. When the gas chromatograph 2 finishes working, the temperature control mechanism dissipates heat evenly to the chromatographic tube 24, so that the staff can quickly detect the next batch of milk powder samples.

[0040] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. The embodiments should therefore be considered illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A random sampling quality inspection device for milk powder production, characterized in that: The quality inspection equipment comprises a pretreatment device (1) and a gas chromatograph (2). The pretreatment device (1) comprises a body (11). A shaker (14) and a water bath distillation box (17) are arranged inside the body (11). A first treatment bottle (12) is arranged on the shaker (14). A distillation bottle (18) is arranged inside the water bath distillation box (17). The gas chromatograph (2) comprises a housing (21). A column temperature box (25) is arranged inside the housing (21). A flow divider (23), a chromatographic tube (24) and a fan blade (27) are arranged inside the column temperature box (25). The flow divider (23) comprises two groups. The two groups of flow dividers (23) are arranged at the upper and lower ends of the column temperature box (25) respectively. The chromatographic tube (24) is arranged at a middle position inside the column temperature box (25); the fan blade (27) is arranged on a side of the column temperature box (25) away from the box door; a connector (22) and a feed port (26) are arranged above the housing (21); one end of the chromatographic tube (24) is connected to the detection system via the connector (22); the other end of the chromatographic tube (24) is connected to the feed port (26); a temperature control box (28) is further arranged outside the housing (21); a temperature control mechanism and a third motor (285) are arranged inside the temperature control box (28); the third motor (285) is connected to the fan blade (27); and the gas flow direction inside the gas chromatograph (2) is controlled via the fan blade (27); The temperature control mechanism comprises a temperature control tank (283), wherein a heating tube (281) and a baffle (282) are arranged in the temperature control tank (283), wherein the baffle (282) is provided in a plurality of groups, wherein the plurality of groups of baffles (282) are all annular structures, wherein the cross-sections of the plurality of groups of baffles (282) are wavy structures, wherein the heating tube (281) is provided in a plurality of groups, wherein the plurality of groups of heating tubes (281) are evenly arranged between the plurality of groups of baffles (282), wherein one end of the temperature control tank (283) is connected to the column temperature box (25) via an air inlet channel (284), and wherein the other end of the temperature control tank (283) is connected to two groups of diverter plates (23) via two groups of conduits at both upper and lower sides; An air inlet (233) is provided at a side end of the diverter plate (23), the air inlet (233) being in communication with a conduit; an air outlet (235) is provided at one end of the diverter plate (23) close to the chromatographic tube (24); a dehumidification rack (234) is provided inside the diverter plate (23), and a dehumidification rack (234) is filled with a desiccant; A second motor (231) is disposed at one end of the diverter plate (23) away from the chromatographic tube (24); the dehumidification rack (234) is an arc-shaped structure; a turntable (232) is disposed at one end of the dehumidification rack (234) close to the second motor (231); and the turntable (232) is connected to the second motor (231).

2. A random sampling quality inspection device for milk powder production according to claim 1, characterized in that: A pretreatment tank (13) is arranged above the body (11), and the pretreatment tank (13) is arranged in three groups, one of which contains acetone, another group of which contains sodium chloride, and the last group of which contains petroleum ether. A lifting seat (16) is also arranged inside the body (11), and a second treatment bottle (15) is arranged inside the lifting seat (16), and anhydrous sodium sulfate is arranged inside the second treatment bottle (15). A five-way pipe (111) is arranged above the first treatment bottle (12), one end of the five-way pipe (111) is aligned with the first treatment bottle (12), the other end of the five-way pipe (111) is aligned with the second treatment bottle (15), and the remaining three ends of the five-way pipe (111) are aligned with the first treatment bottle (12), and the other end of the five-way pipe (111) is aligned with the second treatment bottle (15). The three pretreatment tanks (13) are connected to each other respectively. The shaker (14) is movably mounted in the machine body (11) via a first cylinder (114). The lifting seat (16) is movably mounted in the machine body (11) via a second cylinder (115). A first infusion tube (112) and a second infusion tube (113) are also arranged in the machine body (11). The second treatment bottle (15) is connected to the distillation bottle (18) via the first infusion tube (112). The distillation bottle (18) is connected to the feed port (26) via the second infusion tube (113) and a hose. A first liquid pump is arranged at one end of the five-way pipe (111) close to the second treatment bottle (15). A second liquid pump is arranged on the first infusion tube (112). A third liquid pump is arranged on the second infusion tube (113).

3. A random sampling quality inspection device for milk powder production according to claim 1, characterized in that: The water bath distillation box (17) is movably mounted in the machine body (11) via a third cylinder (116); a mounting frame (19) is disposed above the distillation flask (18); a rotating mechanism and a clamping assembly are disposed in the mounting frame (19); the distillation flask (18) is connected to the rotating mechanism via the clamping assembly; the rotating mechanism controls the uniform heating and centrifugal stratification of the solution in the distillation flask (18).

4. A random sampling quality inspection device for milk powder production according to claim 2, characterized in that: An end cover (121) is provided at the upper end of the first processing bottle (12); a through slot is provided at the middle of the end cover (121); a movable plate (123) is provided below the through slot; the movable plate (123) is movably connected to the end cover (121) via a rotating shaft (122); and a volute spring is provided at the side end of the rotating shaft (122).

5. A random sampling quality inspection device for milk powder production according to claim 3, characterized in that: The rotating mechanism includes a transmission gear (192) and a first motor (194), and the clamping assembly includes a clamping seat (191) and a clamping block (193). The transmission gear (192) is provided in a plurality of groups, and the plurality of groups of transmission gears (192) are evenly arranged on the upper side of the clamping seat (191). The upper end of the clamping seat (191) is provided with teeth. The first motor (194) is connected to one of the groups of transmission gears (192). The clamping blocks (193) are provided in two groups, and each group of clamping blocks (193) is movably installed inside the clamping seat (191) through a compression spring, and the distillation flask (18) is clamped and fixed by the two groups of clamping blocks (193).

6. A random sampling quality inspection device for milk powder production according to claim 5, characterized in that: A through hole is provided at the bottom end of the distillation flask (18), a drain pipe (182) is provided below the distillation flask (18), the drain pipe (182) is aligned with the through hole, a sealing plug (181) is provided inside the drain pipe (182), a drain hole (183) is provided at the side end of the drain pipe (182), a mounting seat (184) is provided below the drain pipe (182), an electromagnet (185) is provided inside the mounting seat (184), the bottom of the sealing plug (181) and the top of the electromagnet (185) are connected via a sealing spring, and one end of the sealing plug (181) close to the electromagnet (185) is magnetic.

7. A random sampling quality inspection device for milk powder production according to claim 1, characterized in that: A plurality of groups of refrigeration elements are embedded on the inner wall surface and the outer wall surface of each group of baffles (282), and a temperature detection element is arranged in the column temperature box (25).

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