CN116794100B - Food detection-based dairy product thermal stability detection system - Google Patents
Food detection-based dairy product thermal stability detection system Download PDFInfo
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- CN116794100B CN116794100B CN202310746625.1A CN202310746625A CN116794100B CN 116794100 B CN116794100 B CN 116794100B CN 202310746625 A CN202310746625 A CN 202310746625A CN 116794100 B CN116794100 B CN 116794100B
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Abstract
The invention belongs to the technical field of dairy product thermal stability detection, in particular to a dairy product thermal stability detection system based on food detection. According to the invention, through the horizontal placement of the placement sleeve, the extending directions of the test tubes are in the same horizontal plane, so that the temperature change difference outside the test tubes in the placement sleeve of the horizontal equipment is small, and the accuracy of the actual heat stability detection of the dairy product is improved.
Description
Technical Field
The invention relates to the technical field of dairy product thermal stability detection, in particular to a dairy product thermal stability detection system based on food detection.
Background
When dairy products are used as raw materials and subjected to UHT processing treatment, protein therein is easy to denature and form sediment and gradually accumulate and adhere to the heating surface of a sterilizing device to form scale, and the high-quality dairy products can be stable at high temperature, so that the heat stability of the dairy products is one of factors for evaluating the quality of the dairy products, and therefore, the heat stability detection of the dairy products is an indispensable ring in the dairy product production process.
The method generally comprises the steps of collecting a dairy product sample, mixing the dairy product sample with water in equal proportion, then sub-packaging the dairy product sample in a plurality of test tubes, storing the dairy product sample and the aqueous solution in the test tubes, heating the dairy product sample and the aqueous solution, and detecting the heated and cooled aqueous solution.
Disclosure of Invention
Based on the technical problems of the background technology, the invention provides a dairy product thermal stability detection system based on food detection.
The invention provides a dairy product thermal stability detection system based on food detection, which comprises a heating unit, wherein the heating unit comprises heating equipment, the heating equipment is provided with a box frame, an oil drum is placed in the box frame, a heating component is fixed on the inner wall of the box frame, an oil shielding plate capable of vertically lifting is arranged above the box frame, the bottom of the oil shielding plate is rotationally connected with a vertically placed positioning shaft, the top end of the positioning shaft is in transmission connection with a motor II, the outer wall of the positioning shaft is provided with a plurality of horizontally placed placing sleeves, test tubes are placed in the placing sleeves, one end of each test tube far away from the positioning shaft is detachably fixed with the inner wall of the placing sleeve, and a plurality of holes I are formed in the outer wall of the placing sleeve.
Preferably, the inner diameter of the placement sleeve gradually increases towards the direction away from the positioning shaft, and the inner diameter of the first hole gradually decreases towards the direction away from the positioning shaft.
Preferably, the outer wall of the placement sleeve is provided with flow grooves which are distributed at equal intervals, and the flow grooves are of an annular structure.
Preferably, the outer wall of the positioning shaft is fixed with a plurality of positioning disks, the periphery of the positioning disks is provided with annular array distributed slide ways, one end of the placing sleeve is fixed with a sliding block in limiting sliding connection with the slide ways, and a plurality of annular array distributed contact assemblies are arranged at positions, corresponding to the positioning disks, of the inner wall of the oil drum.
Preferably, the inside of locating shaft has seted up the intercommunicating pore, a plurality of holes IV have been seted up to the inner wall of intercommunicating pore, the hole second has been seted up to the position that locating disk inner wall and hole fourth correspond, hole second communicates with in the slide, the tip of slider has seted up the hole third with in the slide intercommunication, hole third communicates with in the sleeve of placing.
Preferably, a baffle rod vertically placed is arranged in the communication hole, the outer diameter of the baffle rod is gradually increased downwards, a plurality of fixing blocks horizontally placed are connected with the outer wall of the baffle rod in a threaded mode, the fixing blocks are connected with the holes in a sliding mode, and one end, far away from the baffle rod, of the fixing blocks extends out of the positioning shaft.
Preferably, the contact assembly is provided with two groups of installation blocks, the two groups of installation blocks are respectively arranged above and below the corresponding placing sleeve, one end, close to the positioning shaft, of the installation block inclines towards the direction of the placing sleeve, the outer wall of the installation block is rotationally connected with a rotating sleeve, and one end, close to the placing sleeve, of the rotating sleeve is provided with a spherical structure.
Preferably, the outer wall of the rotating sleeve is fixed with a plurality of rotating sheets, the rotating sheets are provided with two elastic sheets extending outwards in an inclined manner, and a gap is arranged between the two elastic sheets.
Preferably, a dispersing assembly distributed in an annular array is arranged between two adjacent positioning disks, the dispersing assembly is provided with a mounting shaft fixed with the inner wall of the oil drum, baffle plates distributed equidistantly are fixed on the outer wall of the mounting shaft, a sliding ring is slidably connected to the outer wall of the mounting shaft at the position between the two adjacent baffle plates, and a plurality of blades are fixed on the outer wall of the sliding ring.
The beneficial effects of the invention are as follows:
1. according to the embodiment of the invention, the extending direction of the test tube is in the same horizontal plane through the horizontal placement of the placement sleeve, the contact time difference of each position is reduced when oil is introduced into the test tube to contact the test tube, and in the temperature control process, the temperature difference of the oil temperature change in the same horizontal direction is small, so that the temperature change difference outside the test tube in the placement sleeve of the horizontal equipment is small, and the temperature change and the heating treatment of the dairy product solution in the test tube in a uniform state all the time are realized by matching with the rotation of the placement sleeve in the horizontal direction of the positioning shaft, so that the accuracy of the actual heat stability detection of the dairy product is improved.
2. In the embodiment of the invention, the liquid flow generated by the change of the inner diameter and the change of the aperture of the first hole in the placing sleeve is distributed in the vertical direction along the launder, so that the liquid flow around the corresponding placing sleeve and the test tube in the placing sleeve is distributed in a staggered manner in the vertical and horizontal directions, and the test tube and the dairy product solution in the test tube are heated uniformly.
3. According to the embodiment of the invention, the contact assembly and the placing sleeve are arranged in a sliding manner, so that the placing sleeve carries the test tube to horizontally reciprocate in the radial direction, and the interaction flow in the radial direction is increased by matching with the launder, so that the inner liquid flow and the outer liquid flow are rapidly and uniformly dispersed in the peripheral heating process, the temperature variation difference of the liquid flow around the horizontally placed test tube is reduced, and the uniformity of heating the dairy product solution in the test tube is ensured.
4. In the embodiment of the invention, the two rotating sleeves and the rotating sheets of the same group are reversely rotated, so that the liquid flow movement guided by the rotating sheets on the two rotating sleeves is collided and dispersed, and the liquid flow heated at the outer side is rapidly and inwards dispersed uniformly, thereby further improving the actual heating effect and the heating uniformity.
5. In the embodiment of the invention, the slip rings distributed between the two adjacent positioning disks reciprocate to increase the dispersion flow effect of the vertically distributed placing sleeve, so that the uniformity of oil temperature rising is further improved, the uniformity of oil temperature distribution around the test tube is improved, and the uniformity of heating the dairy product solution in the test tube is further enhanced.
Drawings
Fig. 1 is a schematic diagram of the overall module structure of a dairy product thermal stability detection system based on food detection according to the present invention;
fig. 2 is a schematic diagram of the overall structure of a heating device of the dairy product thermal stability detection system based on food detection according to the present invention;
fig. 3 is a schematic diagram showing an open state structure of a baffle of a dairy product thermal stability detection system based on food detection according to the present invention;
fig. 4 is a schematic diagram of the internal structure of a box frame of the dairy product thermal stability detection system based on food detection;
fig. 5 is a schematic diagram of a distribution structure of a placement sleeve of a dairy product thermal stability detection system based on food detection according to the present invention;
fig. 6 is a schematic view of a placement sleeve and a sliding block of a dairy product thermal stability detection system based on food detection according to the present invention;
fig. 7 is a schematic diagram of a cross-sectional structure of a positioning shaft of a dairy product thermal stability detection system based on food detection according to the present invention;
fig. 8 is a schematic diagram of a positioning disk and a sliding block of a dairy product thermal stability detection system based on food detection according to the present invention;
fig. 9 is a schematic view of the placement sleeve, the contact assembly and the dispersion assembly of the dairy product thermal stability detection system based on food detection according to the present invention;
fig. 10 is a schematic diagram of a rotating sleeve structure of a dairy product thermal stability detection system based on food detection according to the present invention;
fig. 11 is a schematic structural diagram of a dispersing component of a dairy product thermal stability detection system based on food detection according to the present invention.
In the figure: 1 box frame, 2 oil drum, 201 oil inlet pipe, 202 oil outlet pipe, 203 air inlet pipe, 204 air outlet pipe, 3 first heating element, 4 second heating element, 5 fixing frame, 6 screw rod, 7 oil shielding plate, 8 positioning shaft, 9 second motor, 10 placing sleeve, 11 test tube, 111 body, 112 piston block, 113 supporting ring, 12 hole one, 13 launder, 14 positioning disk, 141 hole two, 15 slide, 16 slide, 161 hole three, 162 limiting block, 17 communication hole, 18 hole four, 19 shelves pole, 20 fixed block, 21 contact assembly, 211 installation block, 212 rotating sleeve, 213 rotating plate, 22 dispersing assembly, 221 installation shaft, 222 baffle, 223 slip ring, 224 blade.
Detailed Description
Example 1
Referring to fig. 1, the food detection-based dairy product thermal stability detection system comprises a sampling unit, a heating unit and a detection unit:
the sampling unit collects quantitative dairy products and mixes the quantitative dairy products with water to be packaged into a plurality of test tubes 11;
the heating unit comprises heating equipment, and a plurality of test tubes 11 are placed into the heating equipment for heating and then cooled to normal temperature;
the detection unit detects the dairy product solutions of the test tubes 11 respectively;
referring to fig. 2-5, the heating device is provided with a tank frame 1, an oil drum 2 is placed in the tank frame 1, a heating component is fixed on the inner wall of the tank frame 1, the heating component is arranged outside the oil drum 2, the heating component comprises a first heating component 3 positioned on the inner wall of the bottom of the tank frame 1 and a second heating component 4 distributed on the inner wall around the tank frame 1, an oil shielding plate 7 capable of vertically lifting is arranged above the tank frame 1, a fixing frame 5 is fixed on the back surface of the tank frame 1, a screw rod 6 vertically arranged is rotationally connected in the middle position of the fixing frame 5, the bottom end of the screw rod 6 is connected with a motor I, one end of the oil shielding plate 7 is fixedly provided with a limit sliding block which is in limit sliding with the fixing frame 5, a threaded hole in threaded connection with the screw rod 6 is formed in the top of the limit sliding block, thereby the screw rod 6 is rotated by the motor to lift the oil shielding plate 7, the bottom of the oil shielding plate 7 is rotationally connected with a positioning shaft 8 vertically arranged through a bearing, the top end of the positioning shaft 8 is in transmission connection with a motor II 9 fixed at the top of the oil shielding plate 7, the outer wall of the positioning shaft 8 is provided with a plurality of horizontally placed placing sleeves 10, one end of each placing sleeve 10 far away from the positioning shaft 8 is provided with an opening, test tubes 11 are placed in each placing sleeve 10, one end of each test tube 11 far away from the positioning shaft 8 is detachably fixed with the inner wall of each placing sleeve 10, the outer wall of each placing sleeve 10 is provided with a plurality of holes I12, one side top end of the oil drum 2 is communicated with an oil inlet pipe 201, one side bottom end of the oil drum 2 is communicated with an oil outlet pipe 202, one side bottom end of the oil drum 2 is communicated with an air inlet pipe 203, one side top end of the oil drum 2 is communicated with an air outlet pipe 204, so that when the oil shielding plate 7 and the placing sleeves 10 are lifted, in use, each test tube 11 is horizontally inserted into each placing sleeve 10 from the opening and fixed, then the oil shielding plate 7 is lowered to enable the placing sleeves 10 to enter the oil drum 2, then, the preheated oil in the external heating oil chamber is led into the oil drum 2 from the oil inlet pipe 201 to be matched with the heating assembly to heat and control the temperature of the oil in the oil drum 2, so as to heat the test tube 11 in the oil; the extending direction of the test tube 11 is in the same horizontal plane through the horizontal placement of the placement sleeve 10, so that the contact time difference of each position is reduced when oil is introduced into the test tube to contact the test tube, and in the temperature control process, the temperature difference of the oil temperature change in the same horizontal direction is small, so that the temperature change difference outside the test tube 11 in the placement sleeve 10 of the horizontal equipment is small, the positioning shaft 8 is matched with the rotation of the placement sleeve 10 in the horizontal direction, the dairy product solution in the test tube 11 is always in the uniform temperature change and heating treatment, the influence of local coagulation on the detection result caused by uneven heating in the test tube is avoided, and the accuracy of the actual thermal stability detection of the dairy product is improved; after the heating is completed, the oil is discharged from the oil outlet pipe 202, cold air or normal-temperature air is introduced into the tank frame 1 from the air inlet pipe 203, and air is drawn outwards from the air outlet pipe 204, so that the chamber between the tank frame 1 and the oil drum 2 circulates air to cool the oil drum 2 through heat exchange.
In the invention, referring to fig. 6, the inner diameter of the placing sleeve 10 gradually increases towards the direction away from the positioning shaft 8, the inner diameter of the first hole 12 gradually decreases towards the direction away from the positioning shaft 8, the tube 11 is provided with the tube body 111, one end of the tube body 111 away from the positioning shaft 8 is opened, the open end of the tube body 111 is fixedly provided with the piston block 112, the outer wall of the piston block 112 is in threaded connection with the open inner wall of the placing sleeve 10, one end of the tube 11 is detachably fixed between the piston block 112 and the placing sleeve 10, the outer wall of the piston block 112 is fixedly provided with the abutting ring 113, so that in actual use, under the action of centrifugal force, the cavity of the placing sleeve 10 close to the positioning shaft 8 is more extruded, the corresponding hole 12 caliber is larger, and the oil in the placing sleeve 10 close to the positioning shaft 8 flows out faster, so that part of the oil flows towards the direction close to the positioning shaft 8, and is matched with the overall centrifugal operation of external heating and horizontal rotation, thereby the periphery of the tube 11 flows alternately and uniformly in the horizontal direction and the vertical direction in the placing sleeve 10, so that the subsequent heating effect of the tube 11 is further improved.
In the invention, referring to fig. 5-6, the outer wall of the placement sleeve 10 is provided with the flow grooves 13 distributed equidistantly, and the flow grooves 13 are in an annular structure, so that in the process that the placement sleeve 10 rotates horizontally along with the positioning shaft 8, liquid flows generated by the inner diameter change and the aperture change of the first hole 12 in the placement sleeve 10 are matched, so that partial liquid flows outside the placement sleeve 10 are distributed in the vertical direction along the flow grooves 13, and the liquid flows around the corresponding placement sleeve 10 and the test tube 11 therein are distributed in a staggered manner in the vertical and horizontal directions, so that the test tube 11 and the dairy product solution therein are heated uniformly.
Example 2
Embodiment 2 includes all structures and methods of embodiment 1, refer to fig. 5, 7-8, dairy product thermal stability detection system based on food detection, further include, the outer wall of location axle 8 is fixed with a plurality of positioning disks 14, the periphery of positioning disk 14 has set up annular array distributed slide 15, the top and bottom of slide 15 have all set up spacing groove, place sleeve 10 near one end of location axle 8 and be fixed with slide 15 limit sliding connection's slider 16, top and bottom of slider 16 are all fixed with limit groove inner wall sliding connection's stopper 162, the position that oil drum 2 inner wall and positioning disk 14 correspond is provided with a plurality of contact assembly 21 that are annular array distributed, in practical use, place sleeve 10 tip and slider 16 are fixed, but slider 16 limit sliding in slide 15, thereby make slider 16 have certain activity space along slide 15, the slide way 15 extends along the horizontal radial direction of the positioning shaft 9, that is, the placing sleeve 10 has a movable space in the extending direction of the slide way 15 through the sliding block 16, so that in the rotating process, because the placing sleeve 10 and the sliding block 16 are positioned at a position far away from the positioning shaft 8 by centrifugal force, when one end of the test tube 11 far away from the positioning shaft 8 is abutted against the contact assembly 21, the test tube 11 and the placing sleeve 10 are pushed towards the positioning shaft 8, in the horizontal rotating process, the placing sleeve 10 carries the test tube 11 to horizontally reciprocate in the radial direction, and the interactive flow in the radial direction is increased by matching with the launder 13, so that the internal and external liquid flows are quickly and uniformly dispersed in the peripheral heating process, and the variation of the liquid flow temperature around the horizontally placed test tube 11 is reduced, so as to ensure the uniformity of heating the dairy product solution in the test tube 11.
In the invention, referring to fig. 7-8, a communication hole 17 is formed in the positioning shaft 8, a plurality of holes four 18 are formed in the inner wall of the communication hole 17, holes two 141 are formed in the inner wall of the positioning disk 14 and correspond to the holes four 18, the holes two 141 are communicated with the slide way 15, holes three 161 communicated with the slide way 15 are formed in the end part of the sliding block 16, the holes three 161 are communicated with the placing sleeve 10, so that the inner cavity of the placing sleeve 10 is communicated with the communication hole 17 in the positioning shaft 8, during the rotation process of the positioning shaft 8 with the placing sleeve 10, partial liquid flow in the communication hole 17 is thrown out from the holes four 18 along with centrifugal force, and the liquid flow in the position corresponding to the holes four 18 in the same horizontal plane flows in the vertical direction to be filled, so that the liquid flow in the position between the adjacent holes four 18 in the vertical direction flows in the vertical direction is increased, the circulation interaction effect in the vertical direction is further improved, the uniformity of the peripheral liquid flow dispersion in the placing sleeve 10 is further improved, and the uniformity of heating of the dairy product solution in the test tube 11 is further improved.
In the invention, referring to fig. 7, a vertically placed baffle rod 19 is arranged in the communicating hole 17, the outer diameter of the baffle rod 19 is gradually increased downwards, a plurality of horizontally placed fixing blocks 20 are connected to the outer wall of the baffle rod 19 in a threaded manner, the fixing blocks 20 are in sliding connection with the holes IV 18, one end of each fixing block 20, which is far away from the baffle rod 19, extends out of the locating shaft 8, so that in actual operation, liquid flow in the communicating hole 17 is interacted by utilizing the change of the outer diameter of the baffle rod 19, and liquid flow disturbance around the outer periphery of the locating shaft 8 is increased by utilizing the fixing blocks 20 extending out of the communicating hole, and the uniformity of oil in the middle area of the oil drum 2 in the dispersing process is further improved.
Example 3
Based on embodiment 2, referring to fig. 4, 9 and 10, the dairy product thermal stability detection system based on food detection, the contact assembly 21 is provided with two sets of mounting blocks 211, the two sets of mounting blocks 211 are respectively arranged above and below the corresponding placing sleeve 10, one end of the mounting block 211 close to the positioning shaft 8 is inclined towards the direction of the placing sleeve 10, the outer wall of the mounting block 211 is rotatably connected with a rotating sleeve 212, one end of the rotating sleeve 212 close to the placing sleeve 10 is provided with a spherical structure, one end of the rotating sleeve 212 close to the placing sleeve 10 is contacted with a piston block 112 at the end of the test tube 11, a plurality of rotating pieces 213 are fixed on the outer wall of the rotating sleeve 212, the rotating pieces 213 are provided with two elastic pieces extending outwards in an inclined manner, and gaps are arranged between the two elastic pieces, so that in the rotating process of the placing sleeve 10 with the test tube 11, the piston block 112 at the end of the test tube 11 contacts the spherical end of the rotating sleeve 212, that is, when the piston block 112 rotates with the placing sleeve 10 to a position close to the rotating sleeve 212 and is released from the rotating sleeve 212, the placing sleeve 10 is pushed to the middle position along the slideway 15 by the fixing of the position of the rotating sleeve 212 in the horizontal direction, and after the placing sleeve 10 is far away from the rotating sleeve 212, the placing sleeve 10 moves away from the center position due to the rotation centrifugal force, so that the placing sleeve 10 horizontally reciprocates, the rotating sleeve 212 and the rotating piece 213 of the outer wall thereof rotate by friction, and the two rotating sleeves 212 are respectively positioned above and below, so that the two rotating sleeves 212 and the rotating piece 213 of the same group rotate reversely, so that the liquid flow movement guided by the rotating piece 213 on the two rotating sleeves 212 collides and disperses, thereby the liquid flow heated at the outer side is dispersed evenly and rapidly inwards, thereby further improving the actual heating effect and uniformity of heating.
In the invention, referring to fig. 4 and 11, a dispersing assembly 22 distributed in an annular array is arranged between two adjacent positioning plates 14, a mounting shaft 221 fixed with the inner wall of an oil drum 2 is arranged on the dispersing assembly 22, baffle plates 222 distributed equidistantly are fixed on the outer wall of the mounting shaft 221, a sliding ring 223 is connected to the position of the outer wall of the mounting shaft 221 between the two adjacent baffle plates 222 in a sliding manner, a plurality of blades 224 are fixed on the outer wall of the sliding ring 223, so that in the working process, the sliding ring 223 moves away from the positioning shaft 8 due to the liquid flow generated by the movement of a placing sleeve 10 close to the mounting shaft 221, the blades 224 and the sliding ring 223 are also rotated through collision, and when the placing sleeve 10 moves away from the rotating sleeve 212 continuously rotates and moves towards the direction close to the positioning shaft 8, the sliding ring 223 distributed between the two adjacent positioning plates 14 reciprocates, so that the dispersing flow effect of the vertically distributed sliding ring 223 is increased, the uniformity of the temperature rising of the oil is further improved, the uniformity of the temperature distribution of the oil around the sliding ring 223 is further improved, and the uniformity of the temperature distribution of the oil in the environment 11 is further improved, and the test tube 11 is heated, and the uniformity of the emulsion product is heated in the test tube is further enhanced.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (7)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310746625.1A CN116794100B (en) | 2023-06-25 | 2023-06-25 | Food detection-based dairy product thermal stability detection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310746625.1A CN116794100B (en) | 2023-06-25 | 2023-06-25 | Food detection-based dairy product thermal stability detection system |
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| Publication Number | Publication Date |
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| CN116794100A CN116794100A (en) | 2023-09-22 |
| CN116794100B true CN116794100B (en) | 2024-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310746625.1A Active CN116794100B (en) | 2023-06-25 | 2023-06-25 | Food detection-based dairy product thermal stability detection system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2935153Y (en) * | 2006-01-28 | 2007-08-15 | 内蒙古伊利实业集团股份有限公司 | Equipment for detecting stability of milk protein |
| CN214261956U (en) * | 2021-01-07 | 2021-09-24 | 山西卓瑞德科技有限公司 | Reagent pipe water bath device |
| CN216879449U (en) * | 2021-12-20 | 2022-07-05 | 苏州贝蒂克生物技术有限公司 | A test tube rotary heating platform for biotechnology research and development |
| CN115805108A (en) * | 2022-11-25 | 2023-03-17 | 彭伟 | Test tube rotary heating table and method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9156010B2 (en) * | 2008-09-23 | 2015-10-13 | Bio-Rad Laboratories, Inc. | Droplet-based assay system |
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2023
- 2023-06-25 CN CN202310746625.1A patent/CN116794100B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2935153Y (en) * | 2006-01-28 | 2007-08-15 | 内蒙古伊利实业集团股份有限公司 | Equipment for detecting stability of milk protein |
| CN214261956U (en) * | 2021-01-07 | 2021-09-24 | 山西卓瑞德科技有限公司 | Reagent pipe water bath device |
| CN216879449U (en) * | 2021-12-20 | 2022-07-05 | 苏州贝蒂克生物技术有限公司 | A test tube rotary heating platform for biotechnology research and development |
| CN115805108A (en) * | 2022-11-25 | 2023-03-17 | 彭伟 | Test tube rotary heating table and method |
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Inventor after: Shi Jian Inventor after: Ye Wenwen Inventor after: Zhang Yao Inventor before: Ye Wenwen Inventor before: Zhang Yao |