A edible oil stratified sampler and sampling method

Abstract

The present invention relates to a food oil stratified sampler and a sampling method, and relates to the field of food oil sampling. The sampler comprises a fixed sleeve, a moving mechanism, a control structure and a sampling mechanism. The fixed sleeve is fixedly installed inside an oil barrel, and the food oil inside the fixed sleeve and outside the fixed sleeve are isolated from each other. The moving mechanism and the sampling mechanism are installed inside the fixed sleeve. The moving mechanism controls the sampling mechanism to move inside the fixed sleeve. A plurality of sampling holes are provided on the side wall of the fixed sleeve, and a sealing component is correspondingly installed on each sampling hole. The sampling holes are closed and opened by the sealing component. The present invention isolates the moving mechanism from the sampling mechanism through the fixed sleeve, and the sampling mechanism does not directly contact the food oil during the up and down movement of the sampling mechanism, so that the food oil will not be significantly disturbed. When the sampling mechanism samples the oil layer, the oil layer is still in a state of clear layers, thereby improving the sampling accuracy of the oil layer sample.

Description

Technical Field

[0001] The invention relates to the field of edible oil sampling, in particular to an edible oil stratified sampler and a sampling method. Background Art

[0002] During the production and processing of edible oils, the composition may differ due to different storage conditions, processing technology or raw material sources. Stratified sampling of edible oils can ensure that samples are obtained from different layers and that possible contaminants, microorganisms or other harmful substances in edible oils at different layers are detected, thereby evaluating their safety and further evaluating the entire batch of edible oils.

[0003] At present, a Chinese invention patent application with publication number CN 110763521 A and publication date February 7, 2020 proposes a stratified sampler for sampling food oil, an oil drum body, and a hanging block is hung at the mouth of the top of the oil drum, a magnet is embedded on the side of the hanging block close to the oil drum, and two mounting blocks are fixedly connected to the side of the hanging block away from the magnet, an exhaust pipe is fixedly connected to the two mounting blocks, a hose is sleeved on the top of the exhaust pipe, an oil pipe is inserted at the end of the hose away from the exhaust pipe, a limiting plate is sleeved on the end of the oil pipe close to the hose, the oil pipe passes through the hanging block and extends into the oil drum, and a plurality of hanging teeth are fixedly connected to the side of the oil pipe away from the exhaust pipe.

[0004] When in use, slowly insert the oil pipe into the oil barrel. When it reaches the specified depth, clamp the oil pipe by the hanging teeth, and then lower the pull rod. At this time, the oil pipe is locked. The user holds the vacuum pipe to extract air from the oil pipe. At this time, the valve block against the first baffle plate compresses the spring and moves upward. The edible oil enters the sampling tube through the gap between the first baffle plate and the valve block. Then the user draws out the oil pipe and unscrews the sampling tube from the oil pipe to collect the obtained edible oil sample.

[0005] With regard to the above-mentioned related technologies, when in use, it is necessary to insert the oil tube into the oil barrel and move it up and down. In the process of the oil tube moving up and down in the edible oil, the stratified oil is stirred up, which results in the sampled edible oil not being a clearly stratified oil layer, resulting in a large error in the collected edible oil sample. Especially when it is necessary to collect samples of multiple oil layers, using the oil tube to move back and forth in the edible oil repeatedly is more likely to disturb the stratified oil layers, and waiting for the oil layers to be static and stratified will delay a lot of time, affecting progress. Summary of the invention

[0006] In order to improve production efficiency and reduce disturbance to the oil layer when sampling the oil layer, the present invention provides a food oil stratified sampler and a sampling method.

[0007] In the first aspect, the present invention provides a food oil stratified sampler, which adopts the following technical solution:

[0008] A food oil stratified sampler comprises a moving mechanism, a sampling mechanism and a control mechanism, wherein the sampling mechanism is mounted on the moving mechanism, the moving mechanism is used to drive the sampling mechanism to move up and down, and the control mechanism is fixedly mounted on the moving mechanism to control the movement of the moving mechanism and the sampling mechanism;

[0009] It also includes a fixed sleeve, which is fixedly arranged in the food oil sample, and the moving mechanism and the sampling mechanism are arranged inside the fixed sleeve;

[0010] The bottom and side wall of the fixed sleeve are sealed and connected, and a plurality of sampling holes are opened at different heights of the side wall of the fixed sleeve, and a sealing component is correspondingly arranged on each of the sampling holes;

[0011] The sealing assembly comprises a sealing member and an elastic member, wherein the sealing member is slidably disposed in the sampling hole, the elastic member is disposed between the sealing member and the fixed sleeve, and the elastic member has a tendency to cause the sealing member to close the sampling hole;

[0012] The sampling mechanism includes a position control component, a sampling component and an ejector. The position control component is slidably arranged on the moving mechanism. A sample bin is arranged on the position control component. The sampling component is slidably arranged in the sample bin. The sampling component corresponds to the position of the sealing component. The ejector is arranged on the position control component. The ejector corresponds to the position of the sample bin. The ejection direction of the ejector is the same as the extension direction of the sample bin.

[0013] By adopting this technical solution, the fixed sleeve is fixedly installed in the sample oil, and the sealing assembly arranged on the fixed sleeve will close the sampling hole arranged on the fixed sleeve, wherein the sealing member blocks the outside of the sampling hole, the elastic member is connected to the sealing member, and the sealing member is pulled to a position close to the sampling hole, so that the sealing member irradiates the sampling hole for sealing, thereby isolating the space inside the sealing sleeve from the space outside the fixed sleeve; when sampling the sample oil, the moving mechanism controls the sampling mechanism to move inside the fixed sleeve, and the sampling mechanism The sampling assembly is aligned with the sampling hole of the desired sampling oil layer, and the ejector on the position control assembly ejects the sampling assembly from the sample chamber, and then the sampling assembly pushes the sealing member set in the sampling hole away from the sampling hole to open the sampling hole, and the sampling assembly samples the edible oil through the sampling hole; after the sampling is completed, the ejector drives the sampling assembly to move away from the sampling hole until it is completely retracted into the sample chamber to complete the sampling process, and when the sampling assembly is separated from the sealing member, the sealing member automatically closes and seals the sampling hole under the action of the elastic member. In this way, when the sampler is used to sample the edible oil of a specific oil layer, since the fixed sleeve isolates the moving structure and the sampling mechanism from the edible oil, the moving mechanism and the sampling mechanism will not cause obvious disturbance to the oil layer of the edible oil when moving, and the sampling mechanism is controlled to sample the edible oil of the specific oil layer in the sampling hole of the corresponding oil layer, so that the samples taken are all samples of the current oil layer, which greatly improves the accuracy of edible oil sampling.

[0014] Optionally, the sealing member comprises a first limiting portion and a sealing portion, the first limiting portion is arranged at one end of the sealing portion, a second limiting portion is arranged on a side of the sampling hole close to the outer wall of the fixed sleeve, the second limiting portion is arranged in cooperation with the first limiting portion, the sealing portion is penetrated in the sampling hole, and the outer circumferential surface of the sealing portion is sealed with the inner circumferential surface of the sampling hole;

[0015] One end of the sealing portion away from the first limiting portion is detachably connected to a contact piece, one end of the elastic piece contacts the side wall of the fixed sleeve, and the other end contacts the contact piece, and the elastic piece has a tendency to move the contact piece away from the side wall of the fixed sleeve;

[0016] The sealing member is provided with an inner hole, one end of the inner hole is connected to an end of the outer peripheral surface of the sealing portion close to the first limiting portion, and the other end of the inner hole is connected to an end of the sealing portion away from the first limiting portion.

[0017] By adopting this technical solution, after the abutment and the sealing member are connected, the elastic member pushes the abutment in a direction away from the side wall of the fixed sleeve, so that the first limiting portion of the sealing member away from one end of the abutment is tightly attached to the second limiting portion of the sampling hole. At this time, the outer circumferential surface of the sealing member is sealed with the inner circumferential surface of the sampling hole, and one end of the inner hole on the outer circumferential surface of the sealing member is blocked by the inside of the sampling hole to form a seal; when the sampling assembly is ejected by the ejection member, the ejection member will press against the sealing portion of the sealing member, and press against one end of the inner hole away from the first limiting portion to communicate with the inner hole, and when the ejection member continues to be ejected, it will compress the elastic member and push the sealing member in a direction away from the ejection member. The ejector moves the sampling assembly back, and the sampling assembly is separated from the sealing member. The sealing member moves toward the ejector under the action of the elastic member, and then one end of the inner hole on the outer circumferential surface of the sealing member is retracted into the sampling hole. The inner circumference of the sampling hole seals and closes one end of the inner hole on the outer circumferential surface of the sealing member, and the interior of the fixed sleeve is isolated from the external edible oil again. In this way, by setting an inner hole on the sealing member, on the one hand, by linking the ejector with the sealing member, the sealing member can automatically seal the sampling hole, and at the same time, the inner circumference of the sampling hole and the outer circumference of the sealing member can be tightly sealed, which can greatly improve the sealing performance between the sealing member and the sampling hole and reduce the leakage of food oil from the sampling hole; on the other hand, by controlling the movement of the sealing member less, that is, only the inner hole needs to be exposed to connect the inside and the outside of the sealing member, thereby reducing the disturbance to the food oil and improving the accuracy of the food oil sample taken.

[0018] Optionally, the sampling assembly includes a sampling tube, a first piston, a first sealing plug, a first sampling probe and a first silicone cross valve, the sampling tube is slidably arranged in the sample chamber, and a first blocking portion is arranged at one end of the sampling tube close to the ejector;

[0019] The first piston is slidably installed in the sampling tube, and a driving member is provided on the ejection member, and the driving member is transmission-connected with the first piston. The first sealing plug is installed at one end of the sampling tube away from the first blocking portion, and the first piston and the first sealing plug are both sealed with the inner circumferential surface of the sampling tube. The first sampling probe is fixedly arranged on the first sealing plug, and one end of the first sampling probe is connected to the inside of the sampling tube, and the other end is connected to the outside of the sampling tube. The first silicone cross valve is arranged on the first sampling probe.

[0020] By adopting this technical solution, when sampling the oil layer, the ejector pushes against the first blocking part of the sampling tube to eject the sampling tube from the sample chamber. When the sampling tube is ejected, the first sampling probe arranged at the end of the sampling tube away from the ejector pushes against the sealing member to push the sealing member open and abuts against the inner hole on the sealing member, so that the inner hole connects the food oil with the first sampling probe. Then, the driving member on the ejector controls the first piston to move in the direction close to the ejector. During the movement, the first piston sucks the inside of the sampling tube. The first silicone cross valve is in the first During the suction process, the piston is pushed open by pressure, and the food oil is sucked into the sampling tube through the inner hole, the first sampling probe, and the first silicone cross valve in turn. When the first piston moves to the first blocking position at the end of the sampling tube, the sampling tube is filled with food oil. The pressure on both sides of the first silicone cross valve is the same, and the first sampling probe is automatically closed to complete the sampling. After the sampling is completed, the ejector drives the sampling tube to move away from the sampling hole, and the sampling tube is retracted into the sample bin. The sealing part automatically closes the sampling hole under the action of the elastic part, and the above action can be repeated for the next sampling. In this way, the movement of the sampling tube is controlled, and the sample is directly collected into the sampling tube, which can reduce the accumulation of food oil in the transmission pipeline when it passes through the middle transmission pipeline, which will pollute the food oil sample at the next sampling and improve the purity of the food oil sample.

[0021] Optionally, a conical notch is further provided on the sealing member, and the conical notch is provided on the sealing member, and the end with a smaller opening of the conical notch is connected to the inner hole, the diameter of the end with a smaller opening of the conical notch is smaller than the diameter of the first sampling probe, and the diameter of the end with a larger opening of the conical notch is larger than the diameter of the first sampling probe, and the inner circumferential surface of the conical notch is flexibly provided.

[0022] By adopting this technical solution, when the first sampling probe is pressed against the sealing member, the end of the first sampling probe will be inserted into the tapered notch from the end with the larger opening of the tapered notch, and in the process of the first sampling probe moving toward the end with the smaller opening of the tapered notch, the first sampling probe will press against the flexible inner wall of the tapered notch, and because the sealing member is acted upon by the elastic member, the sealing member will drive the tapered notch to move toward the first sampling probe, thereby sealing the first sampling probe pressed against the tapered notch and the tapered notch. In this way, the provision of the tapered notch can increase the sealing performance of the contact portion between the first sampling probe and the inner hole, and reduce the leakage of food oil when it flows from the inner hole into the first sampling probe.

[0023] Optionally, the driving member is an electromagnet, and the driving member is fixedly mounted on one end of the ejection member close to the sample chamber;

[0024] A magnet is arranged on the first piston, the position of the magnet corresponds to the position of the driving member, and a buffer member is arranged at one end of the magnet close to the driving member.

[0025] By adopting this technical solution, the electromagnet and the magnet on the piston are set correspondingly. When taking samples, the electromagnet works to attract the magnet in the direction close to the electromagnet. The magnet is fixed on the piston. When the magnet is attracted, it will drive the piston to move in the direction close to the electromagnet, and then extract the sample in the sampling tube; after the sampling is completed, the magnet and the piston are against the first blocking part of the sampling tube, the ejector retracts, and drives the sampling tube back into the sample chamber; the buffer part set at one end of the magnet close to the electromagnet can make the magnet contact with the first blocking part to play a buffering effect, and protect the magnet and the sampling tube. In this way, the piston can be driven by the electromagnet and the magnet, and the piston and the ejector can be set separately. When the ejector switches to drive different sampling tubes, the non-contact drive set by the electromagnet and the magnet can save the connection structure between the piston and the sampling tube, which is convenient for installing and switching the sampling tube.

[0026] Optionally, the sampling mechanism is provided with a segmented sampling assembly, which includes a sleeve arranged inside the sampling tube, a second piston, a second sealing plug, a second sampling probe fixedly arranged on the second sealing plug, and a second silicone cross valve arranged on the second sampling probe; a second blocking portion is arranged at one end of the sleeve close to the first piston, the second piston is slidably arranged in the sleeve, and the second piston and the inner wall of the sleeve are sealed; a connecting portion is fixedly arranged on one end surface of the second piston, the connecting portion is penetrated in the second blocking portion and connected to the first piston, the second sealing plug is arranged on one end of the sleeve away from the second blocking portion, the second sampling probe is penetrated in the first sampling probe, and the second sampling probe and the first sampling probe are sealed; when the second silicone cross valve is opened, the second sampling probe connects the first sampling probe with the inside of the sleeve;

[0027] The inner wall of the sampling tube is provided with a sealing thickened portion, and the outer peripheral surface of the sleeve is sealed with the sealing thickened portion.

[0028] By adopting this technical solution, when installing the sampling tube and the sleeve, first, the connecting part of the second piston is fixed on the first piston through the second blocking part of the sleeve, and then the second sealing plug with the second sampling probe and the second silicone cross valve is installed on the sleeve. At this time, the connection between the sleeve and the first piston is completed, and then the second sampling probe is inserted into the first sampling probe, the sleeve is connected to the first sealing plug, and finally the connected first piston, sleeve, second sealing plug and first sealing plug are installed in the sampling tube; when taking oil layer samples, the ejector pushes out the sampling tube and connects the first probe with the external food oil through the inner hole. The driving part on the ejector controls the first piston to move in the direction close to the ejector. When the first piston moves, it will first drive the second piston to move inside the sleeve. When the second piston moves inside the sleeve close to the ejector, , since the second piston and the inner wall of the sleeve are sealed, the second piston will suck the inside of the sleeve, and the first silicone cross valve and the second silicone cross valve will open under the action of the second piston suction, and the food oil will enter the sleeve through the inner hole, the first silicone cross valve, the first sampling probe, the second silicone cross valve, and the second sampling probe in sequence. When the second piston moves to the second blocking position of the sleeve, the sleeve is full of food oil, and the second silicone cross valve closes automatically due to the same pressure at both ends; at this time, the sleeve as a whole and the first piston form a fixed structure, and when the first piston continues to move toward the ejector, the sleeve as a whole and the first piston jointly suck the inside of the sampling tube. At this time, since the second silicone cross valve has been closed, the food oil will enter the sampling tube through the inner hole, the first silicone cross valve, and the first sampling probe in sequence, and the food oil in the sampling tube is the sample of the oil layer to be collected. In this way, a sleeve structure is arranged inside the sampling tube, and the first piston and the second piston form a linkage structure. When the food oil layer sample is collected through the inner hole, a two-stage sampling is formed in which the initially collected food oil is collected into the sleeve, and after the sleeve is full, the food oil collected in the middle section is collected into the sampling tube. The food oil sample collected in the sleeve is the "contaminated oil" remaining or deposited in the inner hole during the last collection and the "contaminated oil" near the fixed sleeve, and the food oil collected in the sampling tube is the clean oil in the middle section. The two-stage collection structure can effectively separate the "contaminated oil" from the clean oil, thereby further improving the purity of the collected oil layer sample.

[0029] Optionally, the position control assembly includes a moving member, a turntable and a drive motor, the moving member is slidably mounted on the moving mechanism, the turntable is rotatably mounted on the moving member, and the drive motor is fixedly mounted on the moving member to drive the turntable to move;

[0030] The turntable is provided with a plurality of the sample chambers, and the sampling components are installed in the sample chambers one by one;

[0031] The ejector is fixedly arranged on the moving part.

[0032] By adopting this technical solution, the turntable is set on the moving part, and the driving motor can control the turntable to rotate. When sampling for the first time, the driving motor controls the turntable to rotate to the position corresponding to one of the sample bins and the ejector, and the ejector controls the sampling component in the sample bin to sample. After the first sampling is completed, the driving motor controls the turntable to rotate, and aligns another sample bin on the turntable with the ejector, and the ejector controls the sampling component in the currently aligned sample bin to sample. In this way, by setting a rotatable turntable and setting multiple switchable sample bins on the turntable, when sampling different oil layers, multiple oil layers can be selected at one time for sampling, thereby improving the efficiency of sampling multiple oil layers.

[0033] Optionally, a liquid level sensor is also fixedly disposed on the outer wall of the fixed sleeve, and the liquid level sensor is disposed at the upper end of the fixed sleeve.

[0034] By adopting this technical solution, the liquid level sensor can accurately measure the height of the edible oil liquid surface. By controlling the liquid level of the edible oil and the moving distance of the sampling mechanism controlled by the moving mechanism, the oil layer of the sample collected by the sampling mechanism can be accurately controlled, and the depth of the collected sample oil layer can be quantified, thereby improving the accuracy of the collected sample oil layer.

[0035] In the second aspect, the present invention provides a sampling method using a food oil stratified sampler as described in the first aspect, using the following technical solution:

[0036] A stratified sampling method for food oil comprises the following steps:

[0037] Isolation: A fixed sleeve is used to isolate the edible oil from the moving mechanism and the sampling mechanism;

[0038] Stratification: let the isolated edible oil stand for stratification;

[0039] Layer selection: select the food oil layer after static stratification as the sample;

[0040] Positioning: Control and move the sampling mechanism to the corresponding height of the selected oil layer sample;

[0041] Sampling: The sampling mechanism is controlled to pass through the fixed sleeve and connect with the edible oil for sampling.

[0042] By adopting the above technical solution, when sampling the oil layer sample, the moving mechanism and the sampling mechanism are first separated to reduce the disturbance of the moving mechanism and the sampling mechanism to the oil layer during the movement, and sampling is performed after the edible oil is allowed to stand and stratify, thereby improving the accuracy of the edible oil samples taken.

[0043] In summary, the present invention includes at least one of the following beneficial technical effects:

[0044] 1. A fixed sleeve is provided, and a plurality of sampling holes are provided on the fixed sleeve. A sealing device is provided on the sampling holes. When sampling, the sampling device moves inside the fixed sleeve, and opens the corresponding sampling holes at the required sampling positions, and sampling is performed through the sampling holes, thereby reducing the disturbance of the stratified oil layer when the moving mechanism and the sampling mechanism move in the edible oil, so that the oil layer sample taken by the sampling mechanism is more accurate.

[0045] 2. An inner hole is set on the sealing device. When sampling is required, the sampling device pushes the sealing device out of the sampling hole. At this time, the inner hole connects the outside of the fixed sleeve and the inside of the sealing device. The sampling device can sample the edible oil outside the fixed sleeve through the inner hole, and after the sampling is completed, the sampling device leaves the sealing device. At this time, the sealing device seals the sampling hole by itself. On the one hand, it can reduce the disturbance of the edible oil when the sealing device moves in the edible oil. On the other hand, it can better seal the sampling hole, reduce the leakage of edible oil into the fixed sleeve, and ensure the cleanliness of the inside of the fixed sleeve.

[0046] 3. By controlling the movement of the sampling tube and directly collecting the sample into the sampling tube, it is possible to reduce the accumulation of residues in the transmission pipeline when the edible oil passes through the middle transmission pipeline, thereby reducing the contamination of the edible oil sample during the next sampling, thereby improving the purity of the edible oil sample.

[0047] 4. A sleeve structure is set inside the sampling tube, and the first piston and the second piston form a linkage structure. When the food oil layer sample is collected through the inner hole, a two-stage sampling is formed in which the initially collected food oil is collected into the sleeve, and after the sleeve is full, the food oil collected in the middle section is collected into the sampling tube. The food oil sample collected in the sleeve is the "contaminated oil" remaining or deposited in the inner hole during the last collection and the "contaminated oil" near the fixed sleeve, and the food oil collected in the sampling tube is the clean oil in the middle section. The two-stage collection structure can separate the "contaminated oil" from the clean oil, thereby further improving the purity of the collected oil layer sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0049] Figure 2 is a top view of embodiment 1 of the present invention;

[0050] Figure 3 yes Figure 2 Schematic cross-sectional view of AA in the figure;

[0051] Figure 4 yes Figure 1 A partial enlarged schematic diagram of part I;

[0052] Figure 5 yes Figure 3A partial enlarged schematic diagram of part II;

[0053] Figure 6 yes Figure 5 A partial enlarged schematic diagram of part III;

[0054] Figure 7 It is an exploded view of the sampling assembly and the segmented sampling assembly structure of Example 1 of the present invention.

[0055] Explanation of the reference numerals: 1. fixed sleeve; 11. sampling hole; 111. second limiting part; 12. liquid level sensor; 2. moving mechanism; 3. control mechanism; 4. sealing assembly; 41. sealing member; 411. first limiting part; 412. sealing member; 4121. inner hole; 4122. conical notch; 42. elastic member; 43. abutting member; 5. sampling mechanism; 51. sampling assembly; 511. sampling tube; 5111. first blocking part; 5112. sealing thickening part; 512. first piston; 5121. magnet; 5122, buffer part; 513, first sealing plug; 514, first sampling probe; 515, first silicone cross valve; 52, segmented sampling assembly; 521, sleeve; 5211, second blocking part; 522, second piston; 5221, connecting part; 523, second sealing plug; 524, second sampling probe; 525, second silicone cross valve; 53, position control assembly; 531, drive motor; 532, turntable; 5321, sample chamber; 533, moving part; 54, ejector; 541, drive part. DETAILED DESCRIPTION

[0056] The following combination Figures 1 to 7 The present invention is described in further detail.

[0057] Embodiment 1: The embodiment of the present invention discloses a food oil stratified sampler. Figures 1 to 3 A food oil stratified sampler mainly comprises a fixed sleeve 1, a moving mechanism 2, a control structure and a sampling mechanism 5, wherein the fixed sleeve 1 is fixedly installed inside an oil barrel, and the food oil inside the fixed sleeve 1 and outside the fixed sleeve 1 are isolated from each other, the moving mechanism 2 and the sampling mechanism 5 are installed inside the fixed sleeve 1, the moving mechanism 2 can control the sampling mechanism 5 to move up and down inside the fixed sleeve 1, a plurality of sampling holes 11 are opened at different heights on the side wall of the fixed sleeve 1, each sampling hole 11 is correspondingly installed with a sealing component 4, and the sampling hole 11 is closed and opened by the sealing component 4; when sampling, the moving mechanism 2 controls the sampling mechanism 5 to move up and down inside the fixed sleeve 1, after the sampling mechanism 5 moves to the position corresponding to the sampling hole 11, the sealing component 4 opens the corresponding sampling hole 11, and the sampling mechanism 5 is connected with the food oil outside the fixed sleeve 1 through the sampling hole 11 for sampling, and the sealing component 4 closes the corresponding sampling hole 11 after the sampling is completed.

[0058] In this way, the moving mechanism 2 and the sampling mechanism 5 are isolated by the fixed sleeve 1, so that when the moving structure and the sampling mechanism 5 are working, especially when the sampling mechanism 5 moves up and down, it will not directly contact the edible oil, so it will not cause obvious disturbance to the edible oil. Furthermore, when the sampling mechanism 5 samples the oil layer, the oil layer is still in a clearly layered state, thereby improving the accuracy of sample collection.

[0059] Reference Figures 1 to 3 The fixed sleeve 1 is a square cylindrical structure with an open top as a whole. In order to facilitate cleaning and maintenance of the interior of the fixed sleeve 1, one side wall of the fixed sleeve 1 is set as an open structure connected by bolts and sealed at the side wall connection by a sealing gasket; in order to improve the accuracy of collecting oil layer samples, a plurality of sampling holes 11 are opened on the side wall of the fixed sleeve 1 in the vertical direction, and the height of the sampling holes 11 on each side wall is staggered, thereby increasing the number of sampling holes 11 distributed in the vertical direction; in order to more intuitively measure the depth of edible oil and accurately control the distance that the sampling mechanism 5 moves in the vertical direction, a liquid level sensor 12 is set on the outer wall of the fixed sleeve 1, and the liquid level sensor 12 adopts an excitation An optical distance measuring sensor is used, and the laser distance measuring sensor is installed on the top of the fixed sleeve 1 facing directly downward. When the required depth of the oil layer sample is determined, the liquid level sensor 12 measures the distance L1 between the current position and the food oil surface. The moving mechanism 2 controls the sampling mechanism 5 to move to the top and measures the distance L2 between the sampling mechanism 5 and the liquid level sensor 12 at this time. The difference between L1 and L2 is the distance between the sampling mechanism 5 and the food oil surface in the vertical direction. The sampling oil layer depth L3 is selected, and L3+|L1-L2| is the distance from the sampling mechanism 5 to the sample oil layer. The moving mechanism 2 controls the sampling mechanism 5 to move this distance so that the sample of the selected oil layer depth can be taken through the sampling mechanism 5.

[0060] Reference Figures 4 to 5 The sampling hole 11 is arranged as a circular hole, and a second limiting portion 111 is arranged on one side of the sampling hole 11 close to the outer wall. The second limiting portion 111 is a conical hole or a circular hole whose aperture is larger than the diameter of the circular hole. Preferably, in this embodiment, the second limiting portion 111 is a conical hole formed by chamfering the edge of the circular hole.

[0061] Reference Figure 5 to Figure 6The sealing assembly 4 includes a sealing member 41, an elastic member 42 and an abutment member 43. The sealing member 41 includes a cylindrical sealing portion 412 and a first limiting portion 411 arranged in cooperation with the second limiting portion 111. The diameter of the sealing portion 412 is the same as the inner diameter of the sampling hole 11. The first limiting portion 411 is provided with a conical structure in cooperation with the conical hole of the second limiting portion 111. The end with a larger opening of the conical structure is arranged away from the sealing portion 412. When the sealing portion 412 is inserted into the sampling hole 11, the first limiting portion 411 and the second limiting portion 111 fit together to form a seal; the abutment member 43 is connected to the end of the sealing member 41 away from the first limiting portion 411 through a threaded structure. The straight drop of the abutment member 43 is greater than the diameter of the sampling hole 11. The elastic member 42 is a thrust spring sleeved on the sealing member 41. The two ends of the thrust spring are respectively abutted against the abutment member 43 and the inner wall of the fixed sleeve 1.

[0062] In this way, the first limiting portion 411 and the abutting portion cooperate to allow the seal 41 to move in the sampling hole 11 without falling off, and the elastic member 42 can move the seal 41 toward the inner wall of the fixed sleeve 1, so that the first limiting portion 411 abuts against the second limiting portion 111 for sealing.

[0063] Reference Figure 6 The sealing portion 412 of the sealing member 41 is provided with an inner hole 4121 and a conical notch 4122. The conical notch 4122 is provided on the cross section of the sealing portion 412 away from the first blocking portion 5111. The end with a smaller opening of the conical notch 4122 is provided toward the first blocking portion 5111. The end with a smaller opening of the conical notch 4122 is connected to one end of the inner hole 4121. The inner hole 4121 is provided inside the sealing portion 412, and the other end is connected to the outer peripheral surface of the sealing portion 412 close to the first limiting portion 411.

[0064] When the first limiting portion 411 abuts against the second limiting portion 111, since the outer circumferential surface of the sealing portion 412 is sealed with the inner circumferential surface of the sampling hole 11, the end of the inner hole 4121 set on the outer circumferential surface of the sealing portion 412 is blocked; when the elastic member 42 is compressed, the abutting member 43 and the sealing member 41 move toward the direction close to the outer wall of the fixed sleeve 1, and the first limiting portion 411 is disengaged from the second limiting portion 111. At this time, the inner hole 4121 moves with the sealing member 41 to a position where the end set on the outer circumferential surface of the sealing portion 412 leaves the inner circumferential surface of the sampling hole 11. At this time, the inner hole 4121 connects the edible oil inside the fixed sleeve 1 with the edible oil outside the fixed sleeve 1; when the sampling mechanism 5 is pressed against the sealing member 41, the conical notch 4122 can press the sampling mechanism 5 against the inner circumferential surface of the conical notch 4122 to connect with the inner hole 4121, thereby increasing the sealing between the sampling mechanism 5 and the inner hole 4121.

[0065] Reference Figure 2The moving mechanism 2 is a screw transmission mechanism arranged in the vertical direction, the control mechanism 3 is installed on the top of the moving mechanism 2, and the top of the moving mechanism 2 is connected to the fixed sleeve 1 through a fixed bracket; the sampling mechanism 5 includes a position control component 53, a sampling component 51, a segmented sampling component 52 and an ejector 54, wherein the position control component 53 includes a driving motor 531, a moving part 533 and a turntable 532, the moving part 533 is fixedly connected to the moving end of the screw transmission mechanism by bolts, a cylindrical positioning structure is arranged on the moving part 533, the turntable 532 is arranged in an annular shape as a whole and is sleeved on the cylindrical positioning structure of the moving part 533 for rotation, the driving motor 531 is fixedly arranged on the moving part 533 and controls the rotation of the turntable 532 through a gear set.

[0066] Reference Figure 5 to Figure 6 , six sample bins 5321 are evenly arranged along the circumference of the turntable 532, and the sample bins 5321 are cylindrical openings, and the sample bins 5321 are all arranged along the radial direction of the turntable 532; the ejector 54 is fixedly arranged on the moving member 533, and the ejector 54 is a hydraulic telescopic rod arranged along the radial direction of the turntable 532 or a telescopic mechanism composed of multiple groups of X-shaped connecting rods. Preferably, the present embodiment adopts a gas rod as the ejector 54, and when the ejector 54 is aligned with the sample bin 5321, the axis of the cylinder is colinear with the axis of the sample bin 5321, and a driving member 541 is arranged at one end of the ejector 54 close to the turntable 532, and the driving member 541 is an electromagnet. In order to reduce the collision of the ejector 54 when the sampling assembly 51 is ejected, a buffer pad made of rubber or cotton is also arranged at the end of the ejector 54.

[0067] Reference Figures 5 to 7 The sampling assembly 51 includes a sampling tube 511, a first piston 512 installed inside the sampling tube 511, a first sealing plug 513 installed at an opening at one end of the sampling tube 511, a first sampling probe 514 installed on the first sealing plug 513, and a first silicone cross valve 515 arranged on the first sampling probe 514. A first blocking portion 5111 is arranged at one end of the sampling tube 511. The first blocking portion 5111 is an annular structure with an inner diameter smaller than the inner diameter of the sampling tube 511. The first sealing plug 513 is installed at one end of the sampling tube 511 away from the first blocking portion 5111. The first sampling probe 514 is a hollow syringe. The first sampling probe 514 passes through the first sealing plug 513 and connects the two sides of the first sealing plug 513. In order to facilitate installation, the first silicone cross valve 515 is installed at one end of the first sampling probe 514 and the principle of the sampling tube 511.

[0068] In this way, the sampling tube 511 is installed in the sample chamber 5321 of the turntable 532, and the end of the sampling tube 511 provided with the first blocking portion 5111 is arranged close to the ejector 54. When the ejector 54 is aligned with the sampling tube 511 and ejects the sampling tube 511 from the sample chamber 5321, the ejector 54 pushes against the end of the sampling tube 511 provided with the first blocking portion 5111 to eject the sampling tube 511 from the sample chamber 5321, and the first sealing plug 513, the first piston 512, the first sampling probe 514 and the first silicone cross valve 515 move together with the sampling tube 511. When the ejector 54 moves to the maximum distance, the first sampling probe 514 pushes against the conical notch 4122 on the sealing member 41 to compress the elastic member 42, and moves the inner hole 4121 along with the sealing member 41 to the end set on the outer peripheral surface of the sealing portion 412 to leave the sampling hole. 11 inner circumferential surface, at this time, the inner hole 4121 connects the food oil inside the fixed sleeve 1 and the food oil outside the fixed sleeve 1; then the electromagnet is started to control the first piston 512 to move towards the direction close to the first blocking portion 5111, the first piston 512 sucks inside the sampling tube 511, the first silicone cross valve 515 is opened under the suction action of the first piston 512, and the food oil sample is sucked into the sampling tube 511, when the first piston 512 moves to the first blocking portion 5111 against the sampling tube 511, the sampling tube 511 is filled with the food oil sample, the first silicone cross valve 515 is automatically closed, and finally the ejector 54 is recovered, the first piston 512 is recovered to the sample chamber 5321 along with the ejector 54 under the action of the magnet 5121 and the electromagnet, and the sealing member 41 automatically seals and closes the sampling hole 11 under the action of the elastic member 42 to complete the sampling.

[0069] Reference Figures 5 to 7In order to separate the contaminated oil remaining in the inner hole 4121 of the seal 41 from the clean oil for sampling, the sampling mechanism 5 is further provided with a group sampling assembly 51, which includes a sleeve 521 arranged inside the sampling tube 511, a second piston 522 installed inside the sleeve 521, a second sealing plug 523 installed at the end of the sleeve 521, a second sampling probe 524 installed on the second sealing plug 523, and a second silicone cross valve 525 installed on the second sampling probe 524. The sleeve 521 is inserted into the sampling tube 511, and the length of the sleeve 521 is less than the length of the sampling tube 511. In this embodiment, the length of the sleeve 521 is 1 / 3 of the length of the sampling tube 511. One end of the sleeve 521 A second blocking portion 5211 is provided, and the second blocking portion 5211 is an annular structure with an inner diameter smaller than the inner diameter of the sleeve 521. A connecting portion 5221 is provided at one end of the second piston 522. When the second piston 522 is installed in the sleeve 521, the connecting portion 5221 passes through the second blocking portion 5211 and is installed on the first piston 512 through a threaded structure provided on the connecting portion 5221. The second sealing plug 523 is installed at one end of the sleeve 521 away from the second blocking portion 5211. The second sampling probe 524 is penetrated on the second sealing plug 523, and the two ends of the second sealing plug 523 are connected. For the convenience of installation, a second silicone cross valve 525 is installed at one end of the second sampling probe 524 away from the second blocking portion 5211.

[0070] In order to make the first piston 512 first drive the second piston 522 to move inside the sleeve 521 when it moves, when the second piston 522 moves to abut against the second blocking portion 5211, the sleeve 521 then moves together with the first piston 512 and the second piston 522, a sealing thickened portion 5112 is provided on the inner wall of the sampling tube 511 at 2 / 3 of the distance from the first blocking portion 5111, and the sealing thickened portion 5112 extends to one end of the sampling tube 511 where the first blocking portion 5111 is provided.

[0071] During installation, firstly, the connecting portion 5221 of the second piston 522 is passed through the second blocking portion 5211 of the sleeve 521 and fixed on the first piston 512, and then the second sealing plug 523 with the second sampling probe 524 and the second silicone cross valve 525 is installed on the sleeve 521, at which time the sleeve 521 and the first piston 512 are connected, and then the second sampling probe 524 is inserted into the first sampling probe 514, and the sleeve 521 is connected to the first sealing plug 513, and finally the first piston 512, the sleeve 521, the second sealing plug 523 and the first piston 512 are connected together. The first sealing plug 513 is installed in the sampling tube 511. At this time, the sleeve 521 is located at the end of the sampling tube 511 away from the first blocking portion 5111. Since the length of the sleeve 521 is 1 / 3 of the length of the sampling tube 511, a sealing thickened portion 5112 is provided at 2 / 3 of the distance from the first blocking portion 5111 to the inner wall of the sampling tube 511. At this time, one end of the second blocking portion 5211 provided on the outer circumferential surface of the sleeve 521 is attached to the sealing thickened portion 5112. When the first piston 512 moves, it will first drive the second piston 522 to move inside the sleeve 521. The second piston 522 moves in the sleeve 5 21 moves toward the ejector 54, since the second piston 522 and the inner wall of the sleeve 521 are sealed, the second piston 522 will suck the inside of the sleeve 521, and the first silicone cross valve 515 and the second silicone cross valve 525 are opened under the suction of the second piston 522, and the food oil enters the sleeve 521 through the inner hole 4121, the first silicone cross valve 515, the first sampling probe 514, the second silicone cross valve 525, and the second sampling probe 524 in sequence. When the second piston 522 moves to the second blocking portion 5211 of the sleeve 521, the sleeve 5 21 is filled with edible oil, and the pressure at both ends of the second silicone cross valve 525 is the same and it closes automatically; at this time, the sleeve 521 as a whole and the first piston 512 form a fixed structure, and when the first piston 512 continues to move toward the ejector 54, the sleeve 521 as a whole and the first piston 512 jointly suck the inside of the sampling tube 511. At this time, since the second silicone cross valve 525 has been closed, the edible oil will pass through the inner hole 4121, the first silicone cross valve 515, and the first sampling probe 514 in sequence and enter the sampling tube 511. The edible oil in the sampling tube 511 is the sample of the oil layer to be collected.

[0072] The implementation principle of the stratified food oil sampler of embodiment 1 of the present invention is as follows: during installation, the fixed sleeve 1 is first fixedly installed in the food oil barrel, and the top of the fixed sleeve 1 is arranged higher than the end surface of the food oil, and the moving mechanism 2 and the sampling mechanism 5 are arranged inside the fixed sleeve 1; during sampling, the moving mechanism 2 controls the sampling mechanism 5 to move to the corresponding height, the position control component 53 on the sampling mechanism 5 rotates, and the corresponding sample bin 5321 is aligned with the sampling hole 11, the ejector 54 ejects the sampling tube 511 in the sample bin 5321, the sampling tube 511 is pressed against the sealing component 4 of the sampling hole 11, and the sampling hole 11 is opened, the first sampling probe 514 at the end of the sampling tube 511 is connected to the food oil through the inner hole 4121 on the sealing component 41, and the electromagnet on the ejector 54 works to control the movement of the first piston 512 inside the sampling tube 511, and the first piston During the movement of 512, the second piston 522 will be driven to move inside the sleeve 521 to suck the initial part of the food oil into the sleeve 521. After the sleeve 521 is filled with oil, the second piston 522 drives the sleeve 521 and the first piston 512 to move together to suck the middle oil into the sampling tube 511. When the first piston 512 moves to the other end of the sampling tube 511, the sampling tube 511 is filled with sample oil, and the ejector 54 moves back. Under the action of the electromagnet, the first piston 512 drives the sampling tube 511 to be retracted into the sample chamber 5321 along with the ejector 54. The sealing member 41 automatically closes the sampling hole 11 under the action of the elastic member 42, and a sampling is completed. During the secondary sampling, the turntable 532 on the position control component 53 rotates to align the other sample chamber 5321 with the ejector component, and then the ejector component repeats the above action to perform the secondary sampling.

[0073] Embodiment 2: The embodiment of the present invention provides a sampling method using a food oil stratified sampler as described in Embodiment 1:

[0074] A stratified sampling method for food oil specifically comprises the following steps:

[0075] Isolation step: first, the food oil is isolated from the moving mechanism 2 and the sampling mechanism 5 by using the fixed sleeve 1;

[0076] Specifically, a sealed fixed sleeve 1 is fixedly installed inside the edible oil, and the edible oil outside the fixed sleeve 1 is isolated from the inside of the fixed sleeve 1. Then, the moving mechanism 2 and the sampling mechanism 5 are installed inside the fixed sleeve 1, so that the sampling mechanism 5 can move in the vertical direction under the control of the moving mechanism 2.

[0077] Stratification step: let the isolated food oil stand for stratification;

[0078] Specifically, after the fixed sleeve 1, the moving mechanism 2 and the sampling mechanism 5 are arranged inside the edible oil, the edible oil is left to stand still so that the substances in the edible oil are separated into layers under the action of gravity.

[0079] Layer selection step: select the food oil layer after static stratification as the sample;

[0080] Specifically, based on factors such as the composition and production process of the edible oil, an oil layer of appropriate depth is selected as a sample, and the depth is set to L3.

[0081] Positioning step: controlling the sampling mechanism 5 to move to a height corresponding to the selected oil layer sample;

[0082] Specifically, the liquid level sensor 12 is used to measure the distance L1 between the current position of the liquid level sensor 12 and the edible oil liquid surface, and the moving mechanism 2 controls the sampling mechanism 5 to move to the uppermost position. At this time, the moving mechanism 2 is located below the liquid level sensor 12, and the distance L2 between the sampling mechanism 5 and the liquid level sensor 12 is measured. The difference between L1 and L2 is the distance between the sampling mechanism 5 and the edible oil liquid surface in the vertical direction. Finally, the sampling mechanism 5 is controlled to move vertically downward by a distance of L3+|L1-L2|, and the sampling mechanism 5 can be moved to the corresponding position of the sample oil layer. Correspondingly, if the moving mechanism 2 controls the sampling mechanism 5 to move to the uppermost position, the height of the sampling mechanism 5 is higher than the position of the liquid level sensor 12, and the sampling mechanism 5 needs to move vertically downward by a distance of L3+|L1-L2|.

[0083] Sampling step: controlling the sampling mechanism 5 to pass through the fixed sleeve 1 and connect with the food oil for sampling;

[0084] Specifically, the sampling mechanism 5 is connected to the food oil outside the fixed sleeve 1 through a sampling probe or a valve arranged on the fixed sleeve 1 to perform sampling.

[0085] Preferably, the sampling step also includes a primary sampling step and a secondary sampling step. Specifically, the primary sampling step first samples the food oil, sets a time for the primary sampling, completes the sampling of the contaminated oil remaining in the delivery pipeline, the valve, or the sampling probe, and then starts the secondary sampling step after the primary sampling time ends. The secondary sampling step collects clean oil from the middle section to improve the purity of the collected food oil sample.

[0086] In summary, by setting the fixed sleeve 1, the moving mechanism 2 and the sampling mechanism 5 are installed inside the fixed sleeve 1 to isolate the edible oil outside the fixed sleeve 1 from each other. When sampling, the moving mechanism 2 and the sampling mechanism 5 move inside the fixed sleeve 1, reducing the direct contact between the moving mechanism 2 and the sampling mechanism 5 and the edible oil, and causing disturbance to the stratified oil layer, so that the oil layer sample taken by the sampling mechanism 5 is more accurate; a sampling hole 11 is set on the fixed sleeve 1, and a sealing device is designed on the sampling hole 11, and an inner hole 4121 is set on the sealing device. When sampling is required, the sampling device pushes the sealing device out of the sampling hole 11, and at this time, the inner hole 4121 connects the outside of the fixed sleeve 1 with the inside of the sealing device, and the sampling device can pass the inner hole 4121 to the fixed sleeve 1. The edible oil outside the sleeve 1 is sampled. On the one hand, the disturbance of the sealing device to the edible oil when it moves in the edible oil can be reduced, and on the other hand, the sampling hole 11 can be better sealed; sampling is performed by directly controlling the movement of the sampling tube 511, and the sample is directly collected into the sampling tube 511, which reduces the accumulation of residual edible oil in the transmission pipeline when the edible oil passes through the middle transmission pipeline, thereby improving the purity of the edible oil sample; a sleeve 521 structure is set inside the sampling tube 511, and when the food oil layer sample is collected, a two-stage sampling will be formed, in which the initially collected edible oil is collected into the sleeve 521, and after the sleeve 521 is full, the edible oil collected in the middle section is collected into the sampling tube 511, thereby further improving the purity of the collected oil layer sample.

[0087] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A food oil stratified sampler, comprising a moving mechanism (2), a sampling mechanism (5) and a control mechanism (3), wherein the sampling mechanism (5) is mounted on the moving mechanism (2), the moving mechanism (2) is used to drive the sampling mechanism (5) to move up and down, and the control mechanism (3) is fixedly mounted on the moving mechanism (2) and is used to control the operation of the moving mechanism (2) and the sampling mechanism (5), characterized in that: It also comprises a fixed sleeve (1), the fixed sleeve (1) being fixedly arranged in the food oil sample, the moving mechanism (2) and the sampling mechanism (5) being arranged inside the fixed sleeve (1); The bottom and side wall of the fixed sleeve (1) are both sealed and connected, and a plurality of sampling holes (11) are provided at different heights on the side wall of the fixed sleeve (1), and a sealing assembly (4) is provided on each sampling hole (11) in a one-to-one correspondence; The sealing assembly (4) comprises a sealing member (41) and an elastic member (42); the sealing member (41) is slidably disposed in the sampling hole (11); the elastic member (42) is disposed between the sealing member (41) and the fixed sleeve (1); the elastic member (42) has a tendency to cause the sealing member (41) to close the sampling hole (11); The sampling mechanism (5) comprises a position control component (53), a sampling component (51) and an ejector (54); the position control component (53) is slidably arranged on the moving mechanism (2); a sample chamber (5321) is arranged on the position control component (53); the sampling component (51) is slidably arranged in the sample chamber (5321); the sampling component (51) corresponds to the position of the sealing component (4); the ejector (54) is arranged on the position control component (53); the ejector (54) corresponds to the position of the sample chamber (5321); and the ejection direction of the ejector (54) is the same as the extension direction of the sample chamber (5321); The sampling assembly (51) comprises a sampling tube (511), a first piston (512), a first sealing plug (513), a first sampling probe (514) and a first silicone cross valve (515); the sampling tube (511) is slidably disposed in the sample chamber (5321); and a first blocking portion (5111) is disposed at one end of the sampling tube (511) close to the ejector (54); The first piston (512) is slidably mounted in the sampling tube (511); the ejector (54) is provided with a driving member (541), and the driving member (541) is drivingly connected to the first piston (512); the first sealing plug (513) is mounted on an end of the sampling tube (511) away from the first blocking portion (5111), and the first piston (512) and the first sealing plug (513) are both sealed with the inner circumferential surface of the sampling tube (511); the first sampling probe (514) is fixedly mounted on the first sealing plug (513); one end of the first sampling probe (514) is connected to the interior of the sampling tube (511), and the other end is connected to the exterior of the sampling tube (511); and the first silicone cross valve (515) is arranged on the first sampling probe (514); The sampling mechanism (5) is provided with a segmented sampling assembly (52), the segmented sampling assembly (52) comprising a sleeve (521) arranged inside the sampling tube (511), a second piston (522), a second sealing plug (523), a second sampling probe (524) fixedly arranged on the second sealing plug (523), and a second silicone cross valve (525) arranged on the second sampling probe (524), a second blocking portion (5211) being arranged at one end of the sleeve (521) close to the first piston (512), the second piston (522) being slidably arranged in the sleeve (521), and the second piston (522) and the inner wall of the sleeve (521) being sealed, the second blocking portion (5211) and the second piston (522) being arranged to seal against the inner wall of the sleeve (521), and the second piston (522) and the inner wall of the sleeve (521) being sealed against each other. A connecting portion (5221) is fixedly provided on one end surface of the second piston (522), the connecting portion (5221) is inserted into the second blocking portion (5211) and connected to the first piston (512), the second sealing plug (523) is provided on an end of the sleeve (521) away from the second blocking portion (5211), the second sampling probe (524) is inserted into the first sampling probe (514), and the second sampling probe (524) and the first sampling probe (514) are sealed, and when the second silicone cross valve (525) is opened, the second sampling probe (524) connects the first sampling probe (514) with the inside of the sleeve (521); The inner wall of the sampling tube (511) is provided with a sealing thickened portion (5112), and the outer peripheral surface of the sleeve (521) is sealed with the sealing thickened portion (5112).

2. A food oil stratified sampler according to claim 1, characterized in that: The sealing member (41) comprises a first limiting portion (411) and a sealing portion (412), wherein the first limiting portion (411) is arranged at one end of the sealing portion (412), a second limiting portion (111) is arranged on a side of the sampling hole (11) close to the outer wall of the fixed sleeve (1), the second limiting portion (111) and the first limiting portion (411) are arranged in coordination with each other, the sealing portion (412) is inserted into the sampling hole (11), and an outer peripheral surface of the sealing portion (412) is sealed with an inner peripheral surface of the sampling hole (11); One end of the sealing portion (412) away from the first limiting portion (411) is detachably connected to an abutment member (43); one end of the elastic member (42) abuts against the side wall of the fixed sleeve (1), and the other end abuts against the abutment member (43); the elastic member (42) has a tendency to move the abutment member (43) away from the side wall of the fixed sleeve (1); The sealing member (41) is provided with an inner hole (4121), one end of the inner hole (4121) is connected to an end of the outer peripheral surface of the sealing portion (412) close to the first limiting portion (411), and the other end of the inner hole (4121) is connected to an end of the sealing portion (412) away from the first limiting portion (411).

3. A food oil stratified sampler according to claim 2, characterized in that: The sealing member (41) is further provided with a conical notch (4122). The conical notch (4122) is provided on the sealing member (41), and the end with a smaller opening of the conical notch (4122) is communicated with the inner hole (4121). The diameter of the end with a smaller opening of the conical notch (4122) is smaller than the diameter of the first sampling probe (514), and the diameter of the end with a larger opening of the conical notch (4122) is larger than the diameter of the first sampling probe (514). The inner circumference of the conical notch (4122) is flexibly provided.

4. A food oil stratified sampler according to claim 1, characterized in that: The driving member (541) is an electromagnet, and the driving member (541) is fixedly mounted on one end of the ejection member (54) close to the sample chamber (5321); A magnet (5121) is provided on the first piston (512), the position of the magnet (5121) corresponds to the position of the driving member (541), and a buffer member (5122) is provided at one end of the magnet (5121) close to the driving member (541).

5. A food oil stratified sampler according to any one of claims 1 to 4, characterized in that: The position control component (53) comprises a moving member (533), a rotating disk (532) and a driving motor (531); the moving member (533) is slidably mounted on the moving mechanism (2); the rotating disk (532) is rotatably mounted on the moving member (533); and the driving motor (531) is fixedly mounted on the moving member (533) and is used to drive the rotating disk (532) to move; The rotating disk (532) is provided with a plurality of the sample chambers (5321), and the sampling components (51) are installed in the sample chambers (5321) in a one-to-one correspondence; The ejector (54) is fixedly arranged on the moving part (533).

6. A food oil stratified sampler according to any one of claims 1 to 4, characterized in that: A liquid level sensor (12) is also fixedly arranged on the outer wall of the fixed sleeve (1), and the liquid level sensor (12) is arranged at the upper end of the fixed sleeve (1).

7. A sampling method using a food oil stratified sampler as claimed in any one of claims 1 to 6, characterized in that: The steps include: Isolation: A fixed sleeve (1) is used to isolate the food oil from the moving mechanism (2) and the sampling mechanism (5); Stratification: let the isolated edible oil stand for stratification; Layer selection: select the food oil layer after static stratification as the sample; Positioning: Control and move the sampling mechanism (5) to the height corresponding to the selected oil layer sample; Sampling: The sampling mechanism (5) is controlled to pass through the fixed sleeve (1) and connect with the food oil for sampling.

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