CN112525585B - Food safety inspection sample preprocessing device - Google Patents
Food safety inspection sample preprocessing device Download PDFInfo
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- CN112525585B CN112525585B CN202011359453.5A CN202011359453A CN112525585B CN 112525585 B CN112525585 B CN 112525585B CN 202011359453 A CN202011359453 A CN 202011359453A CN 112525585 B CN112525585 B CN 112525585B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/14—Suction devices, e.g. pumps; Ejector devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2873—Cutting or cleaving
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Abstract
The invention discloses a food safety detection sample pretreatment device, which comprises: a housing comprising a first portion, a second portion, and a third portion; a partition plate dividing the first section into an upper space and a lower space; the first screw is arranged in the lower space, and a sampling head is fixedly arranged at the bottom of the first screw; and the material guide pipe is internally provided with a second screw. The food sampling and sample pretreatment integrated continuous operation can be realized, the food can be sampled and pretreated on site, the whole process can be operated in an anaerobic environment, the phenomenon that a sample to be detected is oxidized by oxygen in the air to cause inaccuracy of a detection result is avoided, meanwhile, the food can be separated into the sample liquid and the sample slag, the food can be detected in a more targeted manner, and the accuracy of food safety detection is ensured.
Description
Technical Field
The invention relates to the technical field of food detection equipment. More particularly, the invention relates to a sample pretreatment device for food safety detection.
Background
The food safety means that the food is nontoxic and harmless, meets the existing nutritional requirements, and does not cause any acute, subacute or chronic harm to human monitoring; the guarantee of food safety has important significance for guaranteeing the health and life safety of people. In recent years, food safety in China has new situations and problems, food safety accidents happen occasionally, and food safety situations are not optimistic, so that the food safety problems become the focus of continuous attention of people, and especially, people pay more attention to safety of fruits and vegetables which are contacted every day in daily life; at present, fruits and vegetables which circulate in the market are subjected to sampling inspection by related departments, and whether the quality of the fruits and vegetables meets the standards regulated by the national food safety laws or not is checked.
The fruit and vegetable sampling inspection process is usually required to be pretreated, the pretreatment equipment in the prior art needs to extract samples, the sampled samples are put into the feed inlet of the equipment, the process characteristics of integration of sampling and sample pretreatment are not possessed, and the problem of sample pollution exists in the sampling and sample treatment processes, so that the accuracy of detection results is low.
Disclosure of Invention
It is an object of the present invention to address at least the above problems and to provide at least the advantages described hereinafter.
The invention also aims to provide a food safety detection sample pretreatment device, which can realize the integrated and continuous operation of food sampling and sample pretreatment, can carry out on-site sampling and pretreatment on food, can operate in an oxygen-free environment in the whole process, avoids the inaccuracy of a detection result caused by the fact that a sample to be detected is oxidized by oxygen in the air, can separate the food into sample liquid and sample slag, carries out more targeted detection, ensures the accuracy of food safety detection, and has the advantages of simple structure, convenience in carrying and strong operability. .
To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described, there is provided a sample preprocessing apparatus for food safety inspection, comprising:
the shell comprises a first part of a hollow cylindrical structure with an open lower end, a second part of the hollow cylindrical structure with two open ends and a third part of a hollow conical structure from top to bottom in sequence, and a material guide opening is formed in one side of the upper part of the first part; the upper end of the second part is movably sleeved on the outer wall of the first part, the first part does not limit the movement of the second part along the axis of the first part, the third part is formed by arranging a plurality of elastic sheets along the circumferential direction, the upper end of any elastic sheet is hinged with the edge of the lower end of the second part, and a torsion spring is arranged at the hinged part of the elastic sheet and the second part;
the baffle is horizontally connected in the first part in an inner mode and located above the material guide port, the baffle divides the first part into an upper space and a lower space which are not communicated with each other, and a nitrogen pressure tank is placed in the upper space;
the first screw rod is coaxially arranged in the lower space, the upper end of a first rotating shaft of the first screw rod is rotatably connected with the lower surface of the partition plate, and the lower end of the first rotating shaft of the first screw rod extends into the third part and is fixedly provided with a sampling head with a conical structure; the inner part of the first rotating shaft is of a hollow structure and is communicated with the nitrogen pressure tank through an air duct; the first helical tooth of the first screw is adjacent to but not in contact with the inner wall of the first part; the inner part of the sampling head is of a hollow structure and is communicated with the inner part of the first rotating shaft, a plurality of blades are arranged on the circumferential side surface of the sampling head at intervals, and an air guide hole is formed in the bottom surface of the sampling head;
the material guide pipe is horizontally arranged on one side of the first part, one end of the material guide pipe is communicated with the material guide port, the lower part of the other end of the material guide pipe is provided with a material outlet, and the material outlet is communicated with the first sample box;
the second screw rod is coaxially arranged inside the material guide pipe, the inside of a second rotating shaft of the second screw rod is of a hollow structure, a plurality of filtering holes are formed in the circumferential side wall of the second rotating shaft at intervals, a one-way valve is arranged in any filtering hole, and the other end, far away from the first part, of the second rotating shaft penetrates out of the other end of the material guide pipe and is communicated with a second sample box through a bearing and a liquid conveying pipe; the second rotating shaft is rotatably connected with the end face of the other end of the material guide pipe; a liquid pump is arranged in the middle of the infusion tube; the top of the second sample box is provided with an exhaust hole; the second thread tooth of the second screw is close to but not in contact with the inner wall of the material guide pipe.
Preferably, the food safety inspection sample preprocessing device further comprises a transmission mechanism, which comprises:
the first bevel gear is fixedly sleeved at the upper end of the first rotating shaft;
the second bevel gear is fixedly sleeved at one end, close to the first part, of the second rotating shaft, the second bevel gear is positioned in the first part and meshed with the first bevel gear, and the maximum diameter of the second bevel gear is smaller than that of the material guide opening;
the first gear disc is fixedly sleeved at the other end, far away from the first part, of the second rotating shaft, and is positioned between the material guide pipe and the bearing;
and the motor is fixedly arranged on the outer wall of the material guide pipe, an output shaft of the motor is parallel to the second rotating shaft, a second gear disc is fixedly sleeved at the free end of the output shaft of the motor, and the second gear disc is meshed with the first gear disc.
Preferably, the food safety inspection sample preprocessing device further comprises a material guiding mechanism, which comprises:
the material guide block is of a cylindrical structure fixedly sleeved on the second rotating shaft and is positioned right above the discharge port, and the axis of the material guide block is parallel to but not coincident with the axis of the second rotating shaft; a groove is annularly arranged on the circumferential side surface of the material guide block;
the discharge pipe is vertically arranged, and two ends of the discharge pipe are respectively communicated with the discharge port and the first sample box;
the lower end of the supporting rod is fixedly connected with the top of the first sample box;
the lower end of the sleeve is coaxially sleeved outside the supporting rod, the upper end of the sleeve extends into the material guide pipe and is rotatably provided with a universal ball, and the top of the universal ball is slidably clamped in the groove;
the spring is sleeved outside the supporting rod and positioned below the sleeve, the lower end of the spring is fixedly connected with the lower end of the supporting rod, and the upper end of the spring is fixedly connected with the bottom of the sleeve;
and the stirring rods are arranged on the circumferential side wall of the sleeve at intervals, and the free end of any stirring rod is not contacted with the inner wall of the discharge pipe.
Preferably, in the food safety detection sample pretreatment device, a circular ring is movably sleeved on the outer wall of the upper end of the first part and is positioned above the material guide pipe, a plurality of connecting rods are arranged between the circular ring and the second part, the upper end of any connecting rod is fixedly connected with the bottom of the circular ring, and the lower end of any connecting rod is fixedly connected with the top of the second part; the first portion does not restrict movement of the ring in the direction of the first portion axis.
Preferably, in the food safety detection sample pretreatment device, a handle is fixedly arranged on one side of the circular ring, which is far away from the material guide pipe.
Preferably, food safety inspection sample preprocessing device, the outer wall of bracing piece is equipped with the external screw thread, telescopic inner wall be equipped with the internal thread that the external screw thread matches.
The invention at least comprises the following beneficial effects:
1. the invention can realize the integrated and continuous operation of food sampling and sample pretreatment, can carry out on-site sampling and pretreatment on food, can operate in an anaerobic environment in the whole process, avoids the sample to be detected from being oxidized by oxygen in the air to cause inaccuracy of a detection result, can separate the food into sample liquid and sample slag, carries out more targeted detection, and ensures the accuracy of food safety detection, and the invention has the advantages of simple structure, convenient carrying and strong operability;
2. the invention is provided with the transmission mechanism, realizes the simultaneous rotation of the first rotating shaft and the second rotating shaft by only one motor, saves energy, has simple structure, reduces the cost of the device and improves the economical practicability of the invention. When sampling is carried out, a motor is started, the second gear disc is driven to rotate, the first gear disc is driven to rotate, and then the second rotating shaft is driven to rotate (the rotating direction of the second rotating shaft is used for conveying a sample from one end of the second rotating shaft to the other end), the second rotating shaft drives the second bevel gear to rotate and drives the first bevel gear to rotate, and finally the first rotating shaft is driven to rotate, (the rotating direction of the first rotating shaft is used for driving the first spiral tooth to convey the sample from bottom to top); under the drive of a motor, taking out a sample from the interior of the food, conveying the sample upwards to a material guide port under the action of a first spiral tooth, entering a material guide pipe, conveying sample slag to a material discharge port under the action of a second spiral tooth, entering a first sample box, and collecting sample liquid to a second sample box under the action of a liquid extraction pump;
3. according to the invention, the stirring rod capable of automatically moving up and down is arranged in the discharging pipe, so that the middle part of the discharging pipe can be dredged, the discharging pipe is prevented from being blocked by sample slag, and the sample pretreatment efficiency is improved. Concretely, drive the rotation of guide block under the rotation of second pivot, because of guide block and second pivot eccentric settings for the guide block can drive the sleeve and arrange the material pipe relatively and reciprocate rotating the in-process and under the mating reaction of spring, and then drives a plurality of puddlers and reciprocate. The invention realizes the up-and-down movement of the stirring rod by utilizing the rotating force of the second rotating shaft, improves the energy utilization rate, reduces the equipment cost and further improves the economic practicability of the invention.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic structural diagram of a food safety inspection sample pre-processing device according to the present invention in an initial state;
fig. 2 is a schematic structural diagram of the food safety detection sample pretreatment device in a sampling state.
Description of reference numerals: 11-first part 12-second part 13-third part 131-elastic sheet 14-circular ring 141-handle 142-connecting rod 2-clapboard 21-nitrogen pressure tank 22-gas guide tube 3-first screw 31-first rotating shaft 32-first helical tooth 4-sampling head 5-material guide tube 6-second screw 61-second rotating shaft 62-second helical tooth 71-first bevel gear 72-second bevel gear 73-first gear disc 74-motor 741-second gear disc 81-first sample box 82-second sample box 821-infusion tube 822-bearing 823-pumping liquid pump 91-material guide block 92-material guide tube 93-support rod 94-sleeve 95-spring 96-stirring rod .
Detailed Description
The present invention is further described in detail below with reference to the drawings and examples so that those skilled in the art can implement the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified.
In the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1-2, the present invention provides a sample pretreatment device for food safety inspection, comprising:
the shell comprises a first part 11 of a hollow cylindrical structure with an open lower end, a second part 12 of the hollow cylindrical structure with two open ends and a third part 13 of a hollow conical structure from top to bottom in sequence, wherein a material guide opening is formed in one side of the upper part of the first part 11; the upper end of the second portion 12 is movably sleeved on the outer wall of the first portion 11, the first portion 11 does not limit the movement of the second portion 12 along the axis thereof, the third portion 13 is formed by arranging a plurality of elastic sheets 131 along the circumferential direction, the upper end of any elastic sheet 131 is hinged with the lower end edge of the second portion 12, and a torsion spring 95 is arranged at the hinged position of the elastic sheet 131 and the second portion 12;
the partition plate 2 is horizontally and internally connected in the first part 11 and is positioned above the material guide port, the partition plate 2 divides the first part 11 into an upper space and a lower space which are not communicated with each other, and a nitrogen pressure tank 21 is arranged in the upper space;
the first screw rod 3 is coaxially arranged in the lower space, the upper end of a first rotating shaft 31 of the first screw rod 3 is rotatably connected with the lower surface of the partition plate 2, and the lower end of the first rotating shaft extends into the third part 13 and is fixedly provided with a sampling head 4 with a conical structure; the interior of the first rotating shaft 31 is a hollow structure and is communicated with the nitrogen pressure tank 21 through a gas guide pipe 22; the first helical tooth 32 of the first screw 3 is adjacent to but not in contact with the inner wall of the first portion 11; the inside of the sampling head 4 is of a hollow structure and is communicated with the inside of the first rotating shaft 31, a plurality of blades are arranged on the circumferential side surface of the sampling head 4 at intervals, and an air guide hole is formed in the bottom surface of the sampling head 4;
the material guiding pipe 5 is horizontally arranged on one side of the first part 11, one end of the material guiding pipe 5 is communicated with the material guiding opening, the lower part of the other end of the material guiding pipe is provided with a material discharging opening, and the material discharging opening is communicated with the first sample box 81;
the second screw rod 6 is coaxially arranged inside the material guide pipe 5, the inside of a second rotating shaft 61 of the second screw rod 6 is of a hollow structure, a plurality of filtering holes are arranged on the circumferential side wall of the second rotating shaft 61 at intervals, a one-way valve (which can not be inserted) is arranged in any filtering hole, the other end, far away from the first part 11, of the second rotating shaft 61 penetrates out of the other end of the material guide pipe 5, and is communicated with the infusion pipe 821 and the second sample box 82 through a bearing 822; the second rotating shaft 61 is rotatably connected with the end surface of the other end of the material guide pipe 5; a liquid pump 823 is arranged in the middle of the liquid conveying pipe 821; the top of the second sample box 82 is provided with an exhaust hole; the second screw flight of the second screw 6 is adjacent to but not in contact with the inner wall of the guide tube 5.
In the technical scheme, the food sampling and sample pretreatment integrated continuous operation can be realized, the food can be sampled and pretreated on site, the whole process can be operated in an oxygen-free environment, the phenomenon that the sample to be detected is oxidized by oxygen in the air to cause inaccuracy of a detection result is avoided, meanwhile, the food can be separated into the sample liquid and the sample slag, the targeted detection is carried out, the accuracy of the food safety detection is ensured, and the food sampling and pretreatment integrated continuous operation device is simple in structure, convenient to carry and high in operability.
As shown in fig. 1, the initial state: any torsion spring 95 is in a natural state, the second part 12 moves downwards relative to the first part 11 to a limit position, the elastic sheets 131 of the third part 13 are sequentially in sealing contact, a hollow conical structure which completely seals the lower end of the first part 11 is further formed, and the bottom of the second screw rod 6 and the sampling head 4 are both located in the third part 13;
before sampling: the invention is suitable for the pretreatment of safety detection of fruits and vegetables, before food sampling, the nitrogen pressure tank 21 is opened, nitrogen is filled into the first rotating shaft 31, the nitrogen sequentially enters the third part 13, the second part 12 and the first part 11 through the air guide hole on the bottom surface of the sampling head 4, then enters the material guide pipe 5, the inside of the second rotating shaft 61, the first sample box 81 and the second sample box 82 through the material guide hole, and finally is discharged from the air exhaust hole, and before sampling, the air in the device is discharged and completely replaced by the nitrogen;
as shown in fig. 2, when sampling: continuing to keep introducing nitrogen, starting the liquid pumping pump 823, moving the sampling device to a position above the food to be detected, so that the bottom of the third part 13 is in contact with the surface of the food to be detected, holding the upper end of the second part 12 with one hand, and pressing the top of the first part 11 downwards with one hand until the lower ends of the sampling head 4 and the first screw 3 enter the food, wherein the free end of any elastic piece 131 abuts against the outer wall of the circumferential surface of the first part 11, so that the sampling head 4 enters the food; then the first rotating shaft 31 is rotated relative to the first part 11, so as to drive the sampling head 4 to rotate, so that food is smashed in the rotating process, the smashed sample is driven by the first helical teeth 32 to be conveyed upwards, the air pressure generated by the introduced nitrogen can also promote the upward conveying of the smashed sample, the smashed sample enters the material guide pipe 5 through the material guide opening, the sample liquid in the smashed sample enters the interior of the second rotating shaft 61 through a plurality of filter holes, only liquid and gas can be kept to flow out under the action of the one-way valve, under the action of the liquid pumping pump 823, the sample liquid in the sample can be thoroughly collected into the second sample box 82, the sample slag is conveyed to the other end of the material guide pipe 5 under the action of the second helical teeth 62 and enters the first sample box 81 through the material outlet, so as to realize solid-liquid separation of the sample, and more targeted detection can be performed on the sample, the accuracy of food safety detection is improved.
In another technical scheme, the food safety inspection sample preprocessing device further comprises a transmission mechanism, which comprises:
a first bevel gear 71 fixedly sleeved on the upper end of the first rotating shaft 31;
a second bevel gear 72 fixedly sleeved at one end of the second rotating shaft 61 close to the first part 11, wherein the second bevel gear 72 is positioned in the first part 11 and meshed with the first bevel gear 71, and the maximum diameter of the second bevel gear 72 is smaller than that of the material guide opening;
a first gear plate 73 fixedly sleeved on the other end of the second rotating shaft 61 far away from the first portion 11, wherein the first gear plate 73 is located between the material guiding pipe 5 and the bearing 822;
and a motor 74 fixedly arranged on the outer wall of the material guiding pipe 5, wherein an output shaft of the motor 74 is arranged in parallel with the second rotating shaft 61, a second gear disc 741 is fixedly sleeved at a free end of the output shaft of the motor 74, and the second gear disc 741 is engaged with the first gear disc 73.
In the technical scheme, the invention is provided with the transmission mechanism, and the simultaneous rotation of the first rotating shaft 31 and the second rotating shaft 61 is realized by only one motor 74, so that the energy is saved, the structure is simple, the device cost is reduced, and the economical practicability of the invention is improved. When sampling, the motor 74 is started to drive the second gear disc 741 to rotate, so as to drive the first gear disc 73 to rotate, and further drive the second rotating shaft 61 to rotate (the rotation direction of the second rotating shaft 61 is to convey a sample from one end of the second rotating shaft 61 to the other end), the rotation of the second rotating shaft 61 drives the second bevel gear 72 to rotate, drives the first bevel gear 71 to rotate, and finally drives the first rotating shaft 31 to rotate, (the rotation direction of the first rotating shaft 31 is to drive the first helical teeth 32 to convey the sample from bottom to top); under the drive of the motor 74, the sample is taken out from the food, and is conveyed upwards to the material guiding opening under the action of the first helical tooth 32, and enters the material guiding pipe 5, the sample slag is conveyed to the material discharging opening under the action of the second helical tooth 62, and enters the first sample box 81, and the sample liquid is collected to the second sample box 82 under the action of the liquid pumping pump 823.
In another technical scheme, food safety inspection sample preprocessing device still include guide mechanism, it includes:
the material guide block 91 is of a cylindrical structure fixedly sleeved on the second rotating shaft 61 and is positioned right above the material outlet, and the axis of the material guide block 91 is parallel to but not coincident with the axis of the second rotating shaft 61; a groove is annularly arranged on the circumferential side surface of the material guide block 91;
a discharge pipe 92, which is vertically disposed and two ends of which are respectively communicated with the discharge port and the first sample box 81;
a support rod 93 vertically positioned inside the discharge pipe 92, wherein the lower end of the support rod 93 is fixedly connected with the top of the first sample box 81;
the lower end of the sleeve 94 is coaxially sleeved outside the support rod 93, the upper end of the sleeve 94 extends into the material guide pipe 5, a universal ball is rotatably arranged in the material guide pipe, and the top of the universal ball is slidably clamped in the groove;
the spring 95 is sleeved outside the supporting rod 93 and is positioned below the sleeve 94, the lower end of the spring 95 is fixedly connected with the lower end of the supporting rod 93, and the upper end of the spring is fixedly connected with the bottom of the sleeve 94;
a plurality of stirring rods 96 are arranged on the circumferential side wall of the sleeve 94 at intervals, and the free end of any stirring rod 96 is not contacted with the inner wall of the discharge pipe 92.
In the technical scheme, the stirring rod 96 capable of automatically moving up and down is arranged in the discharging pipe 92, so that the middle of the discharging pipe 92 can be dredged, the sample slag is prevented from blocking the discharging pipe 92, and the sample pretreatment efficiency is improved. Specifically, the rotation of the material guiding block 91 is driven under the rotation of the second rotating shaft 61, and the material guiding block 91 and the second rotating shaft 61 are eccentrically arranged, so that the material guiding block 91 can drive the sleeve 94 to move up and down relative to the material discharging pipe 92 under the matching action of the spring 95 in the rotation process, and further drive the stirring rods 96 to move up and down. The invention realizes the up-and-down movement of the stirring rod 96 by utilizing the rotating force of the second rotating shaft 61, improves the energy utilization rate, reduces the equipment cost and further improves the economical practicability of the invention.
In another technical scheme, in the sample pretreatment device for food safety detection, a circular ring 14 is movably sleeved on the outer wall of the upper end of the first part 11 and is positioned above the material guide pipe 5, a plurality of connecting rods 142 are arranged between the circular ring 14 and the second part 12, the upper end of any connecting rod 142 is fixedly connected with the bottom of the circular ring 14, and the lower end of any connecting rod 142 is fixedly connected with the top of the second part 12; the first portion 11 does not restrict the movement of the ring 14 in the direction of the axis of the first portion 11. The second part 12 and the third part 13 move up and down relative to the first part 11 by pushing and pulling the circular ring 14 relative to the first part 11, before sampling, the lower end of the first part 11 is completely sealed by the second part 12 and the third part 13, and the sampling head 4 is positioned in the third part 13; after the gas displacement is completed, the aeration is continued, and the ring 14 is pulled upward relative to the first portion 11, so that the second portion 12 and the third portion 13 are moved upward relative to the first portion 11, and the sampling head 4 is removed from the housing for sampling.
In another technical scheme, in the sample pretreatment device for food safety detection, a handle 141 is fixedly arranged on one side of the circular ring 14, which is far away from the material guiding pipe 5. In practical application, after the air inside the device of the present invention is replaced, the housing is vertically downward contacted with the surface of the food with the sample, one hand presses the top of the first portion 11 downward, the other hand holds the handle 141, so that the second portion 12 moves upward relative to the first portion 11, and further drives the third portion 13 to move upward, the plurality of elastic sheets 131 are opened under the pushing of the lower end edge of the first portion 11, and the sampling head 4 is vertically inserted downward into the food for sampling. The design of handle 141 makes things convenient for the sampling operation, simple structure and labour saving and time saving.
In another technical scheme, in the sample pretreatment device for food safety detection, the outer wall of the support rod 93 is provided with an external thread, and the inner wall of the sleeve 94 is provided with an internal thread matched with the external thread. Realize rotating with bracing piece 93 and sleeve 94 through the screw thread and be connected for sleeve 94 still can rotate around self axis when relative bracing piece 93 reciprocates, and then drives a plurality of puddlers 96 and rotates, can be better dredge row material pipe 92.
The number of apparatuses and the scale of the process described herein are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be apparent to those skilled in the art.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (6)
1. Food safety inspection sample preprocessing device, its characterized in that, it includes:
the device comprises a shell, a first guide device and a second guide device, wherein the shell sequentially comprises a first part of a hollow cylindrical structure with an open lower end, a second part of the hollow cylindrical structure with two open ends and a third part of a hollow conical structure from top to bottom, and a material guide opening is formed in one side of the upper part of the first part; the upper end of the second part is movably sleeved on the outer wall of the first part, the first part does not limit the movement of the second part along the axis of the first part, the third part is formed by arranging a plurality of elastic sheets along the circumferential direction, the upper end of any elastic sheet is hinged with the lower end edge of the second part, and a torsion spring is arranged at the hinged part of the elastic sheet and the second part;
the baffle is horizontally connected in the first part in an inner mode and located above the material guide port, the baffle divides the first part into an upper space and a lower space which are not communicated with each other, and a nitrogen pressure tank is placed in the upper space;
the first screw rod is coaxially arranged in the lower space, the upper end of a first rotating shaft of the first screw rod is rotatably connected with the lower surface of the partition plate, and the lower end of the first rotating shaft of the first screw rod extends into the third part and is fixedly provided with a sampling head with a conical structure; the inner part of the first rotating shaft is of a hollow structure and is communicated with the nitrogen pressure tank through an air duct; the first helical tooth of the first screw is adjacent to but not in contact with the inner wall of the first part; the inner part of the sampling head is of a hollow structure and is communicated with the inner part of the first rotating shaft, a plurality of blades are arranged on the circumferential side surface of the sampling head at intervals, and an air guide hole is formed in the bottom surface of the sampling head;
the material guide pipe is horizontally arranged on one side of the first part, one end of the material guide pipe is communicated with the material guide port, the lower part of the other end of the material guide pipe is provided with a material outlet, and the material outlet is communicated with the first sample box;
the second screw rod is coaxially arranged inside the material guide pipe, the inside of a second rotating shaft of the second screw rod is of a hollow structure, a plurality of filtering holes are formed in the circumferential side wall of the second rotating shaft at intervals, a one-way valve is arranged in any filtering hole, and the other end, far away from the first part, of the second rotating shaft penetrates out of the other end of the material guide pipe and is communicated with a second sample box through a bearing and a liquid conveying pipe; the second rotating shaft is rotatably connected with the end face of the other end of the material guide pipe; a liquid pump is arranged in the middle of the infusion tube; the top of the second sample box is provided with an exhaust hole; the second thread tooth of the second screw is close to but not in contact with the inner wall of the material guide pipe.
2. The food safety inspection sample pretreatment device according to claim 1, further comprising a transmission mechanism comprising:
the first bevel gear is fixedly sleeved at the upper end of the first rotating shaft;
the second bevel gear is fixedly sleeved at one end, close to the first part, of the second rotating shaft, the second bevel gear is positioned in the first part and meshed with the first bevel gear, and the maximum diameter of the second bevel gear is smaller than that of the material guide opening;
the first gear disc is fixedly sleeved at the other end, far away from the first part, of the second rotating shaft, and the first gear disc is positioned between the material guide pipe and the bearing;
and the motor is fixedly arranged on the outer wall of the material guide pipe, an output shaft of the motor is parallel to the second rotating shaft, a second gear disc is fixedly sleeved at the free end of the output shaft of the motor, and the second gear disc is meshed with the first gear disc.
3. The sample pretreatment device for food safety inspection according to claim 2, further comprising a material guiding mechanism, which comprises:
the material guide block is of a cylindrical structure fixedly sleeved on the second rotating shaft and is positioned right above the discharge port, and the axis of the material guide block is parallel to but not coincident with the axis of the second rotating shaft; a groove is annularly arranged on the circumferential side surface of the material guide block;
the discharge pipe is vertically arranged, and two ends of the discharge pipe are respectively communicated with the discharge port and the first sample box;
the lower end of the supporting rod is fixedly connected with the top of the first sample box;
the lower end of the sleeve is coaxially sleeved outside the supporting rod, the upper end of the sleeve extends into the material guide pipe and is rotatably provided with a universal ball, and the top of the universal ball is slidably clamped in the groove;
the spring is sleeved outside the supporting rod and positioned below the sleeve, the lower end of the spring is fixedly connected with the lower end of the supporting rod, and the upper end of the spring is fixedly connected with the bottom of the sleeve;
and the stirring rods are arranged on the circumferential side wall of the sleeve at intervals, and the free end of any stirring rod is not contacted with the inner wall of the discharge pipe.
4. The food safety inspection sample pretreatment device according to claim 3, wherein a circular ring is movably sleeved on the outer wall of the upper end of the first part and is positioned above the material guide pipe, a plurality of connecting rods are arranged between the circular ring and the second part, the upper end of any connecting rod is fixedly connected with the bottom of the circular ring, and the lower end of any connecting rod is fixedly connected with the top of the second part; the first portion does not restrict movement of the ring in the direction of the first portion axis.
5. The sample pretreatment device for food safety detection according to claim 4, wherein a handle is fixedly arranged on one side of the circular ring away from the material guide pipe.
6. The food safety inspection sample pretreatment device according to claim 5, wherein the outer wall of the support rod is provided with an external thread, and the inner wall of the sleeve is provided with an internal thread matching the external thread.
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| CN112525585A (en) | 2021-03-19 |
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Address after: 100142 16 / F, century Yuhui building, 73 Fucheng Road, Haidian District, Beijing Patentee after: SGS-CSTC STANDARDS TECHNICAL SERVICES Co.,Ltd. Address before: 100142 17th floor, century Yuhui building, 73 Fucheng Road, Haidian District, Beijing Patentee before: SGS-CSTC STANDARDS TECHNICAL SERVICES Co.,Ltd. |