CN214150291U - Water activity detector - Google Patents
Water activity detector Download PDFInfo
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- CN214150291U CN214150291U CN202023272292.4U CN202023272292U CN214150291U CN 214150291 U CN214150291 U CN 214150291U CN 202023272292 U CN202023272292 U CN 202023272292U CN 214150291 U CN214150291 U CN 214150291U
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Abstract
A water activity detector relates to the field of water activity detection and comprises a fixed seat fixed on a lower shell; a base connected with the fixed seat through a rotating shaft; a knob fixing component; the mounting groove and the groove are arranged on the inner side of the base; an infrared temperature sensor and a pressure sensor which are arranged in the mounting groove; the sample preheating position and the sample detection position are arranged on the lower shell, the sample preheating position corresponds to the groove, and the sample detection position corresponds to the infrared temperature sensor; the first heating device is arranged in the lower shell and is positioned at the lower end of the sample preheating position; the second heating device is arranged in the lower shell and is positioned at the lower end of the sample detection position; the pressure sensor is arranged in the lower shell and positioned at the lower end of the sample detection position, and the pressure sensor is connected with the sample detection position; the infrared temperature sensor, the pressure sensor, the first heating device and the second heating device are all connected with the microprocessor. The utility model discloses simple structure, easy and simple to handle, detection efficiency and precision are high.
Description
Technical Field
The utility model relates to a water activity ratio detects technical field, concretely relates to water activity ratio detector.
Background
Water Activity (Water Activity, aw) is also called Water Activity or Water Activity, and is a parameter for representing the energy state of Water in a sample, and by measuring the Water Activity of the sample, the stability of the sample and whether the growth of microorganisms is inhibited can be judged, so that the safe shelf life of the product can be evaluated, the packaging mode and the packaging material can be evaluated, and the formula of the product can be evaluated. The relationship between water activity and microbial growth is shown in the following table.
The water activity measuring instrument has been widely used in the fields of food/medicine/cosmetics and the like, and has been incorporated into a plurality of standard systems, such as national GB standards, FDA, USDA regulations, GMP, HAACCP and the like.
At present, the existing water activity tester has the problems of long detection time and low detection efficiency.
SUMMERY OF THE UTILITY MODEL
The problem of detection time long, detection efficiency is low in order to solve current water activity tester existence, the utility model provides a water activity detector.
The utility model discloses a solve the technical scheme that technical problem adopted as follows:
the utility model discloses a water activity detector, include: the touch screen is connected with the microprocessor;
the first fixed seat and the second fixed seat are fixed on the lower shell;
the base is connected with the first fixing seat and the second fixing seat through a rotating shaft;
a knob fixing component for connecting the base and the lower shell;
the mounting groove and the groove are arranged on the inner side of the base;
an infrared temperature sensor and a pressure sensor which are arranged in the mounting groove;
the sample preheating position and the sample detection position are arranged on the lower shell, the sample preheating position and the groove are arranged correspondingly, and the sample detection position and the infrared temperature sensor are arranged correspondingly;
the first heating device is arranged in the lower shell and is positioned at the lower end of the sample preheating position;
the second heating device is arranged in the lower shell and is positioned at the lower end of the sample detection position;
the pressure sensor is arranged in the lower shell and positioned at the lower end of the sample detection position, and the pressure sensor is connected with the sample detection position;
the infrared temperature sensor, the pressure sensor, the first heating device and the second heating device are all connected with the microprocessor.
Further, the method also comprises the following steps: the first strip-shaped hole is formed in the edge of the inner side of the base.
Further, the method also comprises the following steps: and the second strip-shaped hole is formed in the lower machine shell and corresponds to the first strip-shaped hole.
Further, the knob fixing assembly includes: the rotary knob is arranged in a mounting hole on the front side surface of the base, the buckle is fixed on the outer side of the rack block and arranged in the first strip-shaped hole, the clamping block is arranged in the second strip-shaped hole, the driving shaft is fixed at the center of the lower end of the rotary knob, the gear is fixed at the lower end of the driving shaft, the rack block is meshed with the gear, and the first sliding rail and the second sliding rail are fixed on the inner wall of the base;
the first slide rail and the second slide rail are oppositely arranged; the first sliding rail and the second sliding rail are both provided with bulges;
the upper side and the lower side of the rear end of the rack block are respectively provided with a sliding chute, the bulge of the first sliding rail is arranged in the sliding chute on the upper side of the rack block, and the bulge of the second sliding rail is arranged in the sliding chute on the lower side of the rack block;
the buckle is provided with a clamping groove, and the clamping block is arranged in the clamping groove of the buckle.
The utility model has the advantages that:
the utility model has simple structure and convenient operation, can preheat in advance by adopting the sample preheating position, saves the detection time and improves the detection efficiency; rapidly detecting the water activity of the sample by adopting a rapid air pressure balance mode; a Peltier patch is arranged inside, and the detection temperature is accurately controlled; detection precision: 0.005aw @25 ℃; resolution ratio: 0.001 aw; temperature control accuracy: 0.2 ℃; temperature resolution: 0.1 ℃.
Drawings
Fig. 1 is the structure diagram of the water activity detector of the present invention.
Fig. 2 is a schematic structural diagram.
Fig. 3 is a schematic view of the connection relationship among the knob, the buckle, the gear and the rack block.
Fig. 4 is a schematic structural view of the buckle.
FIG. 5 is a schematic view of the connection between the buckle and the clamping block.
Fig. 6 is a schematic view of the connection relationship between the gear, the rack block and the second slide rail.
FIG. 7 is a schematic diagram showing the connection relationship between the microprocessor and the pressure sensor, the first heating device, the second heating device, the pressure sensor, and the pressure sensor.
In the figure, 1, a lower case, 2, an upper case, 3, a touch screen, 4, a base, 5, a knob, 6, a first strip-shaped hole, 7, a buckle, 8, a sealing ring, 9, an infrared temperature sensor, 10, a groove, 11, a first fixing seat, 12, a rotating shaft, 13, a second fixing seat, 14, a sample preheating position, 15, a sample detection position, 16, a second strip-shaped hole, 17, a clamping block, 18, a driving shaft, 19, a gear, 20, a rack block, 21, a first sliding rail, 22, a second sliding rail, 23 and a pressure sensor.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 to 7, the water activity detector of the present invention mainly comprises: lower casing 1, upper casing 2, touch-sensitive screen 3, base 4, knob 5, first bar hole 6, buckle 7, sealing washer 8, infrared temperature sensor 9, recess 10, first fixing base 11, pivot 12, second fixing base 13, sample preheating position 14, sample detection position 15, second bar hole 16, the piece 17 of blocking, drive shaft 18, gear 19, rack piece 20, first slide rail 21, second slide rail 22, microprocessor, pressure sensor, first heating device, second heating device and pressure sensor 23.
The upper casing 2 is fixed to the lower casing 1.
The touch screen 3 is mounted on the upper case 2.
The first fixing seat 11 and the second fixing seat 13 are fixed on the lower case 1.
The microprocessor is mounted inside the lower case 1.
In this embodiment, the microprocessor specifically uses a DSP chip.
The touch screen 3 is connected to the microprocessor. The touch screen 3 employs a 5-inch touch screen with a resolution of 480 x 854 pixels.
The pressure sensor, the first heating device and the second heating device are all arranged inside the lower machine shell 1. And the pressure sensor, the first heating device and the second heating device are all connected with the microprocessor.
The base 4 is hollow inside. The lower end of the base 4 is connected with the first fixing seat 11 and the second fixing seat 13 through the rotating shaft 12, and the base 4 can rotate on the first fixing seat 11 and the second fixing seat 13 through the rotating shaft 12.
A first strip-shaped hole 6 is arranged at the edge of the inner side of the base 4.
The inner side of the base 4 is provided with a mounting groove, and the outer ring of the mounting groove is provided with a sealing ring 8. An infrared temperature sensor 9 and a pressure sensor 23 are installed in the mounting groove. Both the infrared temperature sensor 9 and the pressure sensor 23 are connected to the microprocessor. An infrared temperature sensor 9 is used to determine the sample temperature. The pressure sensor 23 is used to determine the equilibrium vapor pressure of the sample at equilibrium.
A recess 10 is provided inside the base 4.
A sample preheating site 14 and a sample detection site 15 are provided on the lower housing 1. Wherein, the sample preheating position 14 is arranged corresponding to the groove 10, the sample detection position 15 is arranged corresponding to the infrared temperature sensor 9, the pressure sensor is arranged in the lower shell 1 and is positioned at the lower end of the sample detection position 15, and the pressure sensor is connected with the sample detection position 15 and is used for measuring the weight of the sample.
The first heating device is arranged in the lower shell 1 and at the lower end of the sample preheating position 14, and is used for heating the sample preheating position 14.
The second heating device is arranged in the lower shell 1 and positioned at the lower end of the sample detection position 15, and is used for heating the sample detection position 15.
In the embodiment, the first heating device and the second heating device both adopt Peltier, and the detection temperature can be accurately controlled.
A second strip-shaped hole 16 is provided in the lower case 1. Wherein, the second bar hole 16 is arranged corresponding to the first bar hole 6.
A clamping block 17 is arranged in the second strip-shaped hole 16 of the lower case 1.
As shown in fig. 2 to 6, the knob 5 is mounted in a mounting hole in the front side surface of the base 4. The driving shaft 18, the gear 19, the rack block 20, the first slide rail 21 and the second slide rail 22 are all installed inside the base 4. Specifically, the method comprises the following steps: the upper end of the driving shaft 18 is fixed at the center of the lower end of the knob 5, and the lower end of the driving shaft 18 is fixed in the center hole of the gear 19. The first slide rail 21 and the second slide rail 22 are fixed on the inner wall of the base 4. The first slide rail 21 and the second slide rail 22 are disposed opposite to each other. The first slide rail 21 and the second slide rail 22 are both provided with protrusions. The rack of the rack block 20 is engaged with the gear 19, the upper and lower sides of the rear end of the rack block 20 are respectively provided with a sliding groove, the protrusion of the first sliding rail 21 is installed in the sliding groove on the upper side of the rack block 20, and the protrusion of the second sliding rail 22 is installed in the sliding groove on the lower side of the rack block 20, so that the rack block 20 can move back and forth along the first sliding rail 21 and the second sliding rail 22.
The catch 7 is fixed outside the rack block 20, and the catch 7 is disposed in the first strip-shaped hole 6. As shown in fig. 4, the clip 7 is provided with a clip groove. The catch block 17 fits exactly into the catch groove of the catch 7, as shown in fig. 5.
As shown in fig. 6, by screwing the knob 5, the gear 19 is driven to rotate by the rotating shaft 18, the rack block 20 is driven to move back and forth along the first slide rail 21 and the second slide rail 22 by the meshing action between the gear 19 and the rack block 20, so that the buckle 7 is driven to move back and forth, the buckle 7 and the clamping block 17 are buckled together to realize the closing of the base 4, and then the detection can be started.
The utility model discloses a water activity detector, when using, switch on, touch-sensitive screen 3 opens, heat treatment is carried out to sample preheating position 14 through first heating device earlier, after heating to preset temperature, place the sample in sample detection position 15, close base 4, heat treatment is carried out to sample detection position 15 through second heating device, in the heating process, through the weight change of pressure sensor real-time measurement sample, and through infrared temperature sensor 9 real-time measurement sample temperature, when the weight of sample no longer changes, namely the constant weight, stop heating, infrared temperature sensor 9 at this moment with the sample temperature transmission of constant weight for microprocessor, transmit the sample weight of constant weight for microprocessor through pressure sensor, at this moment with the balance steam pressure of pressure sensor 23 direct measurement sample, and transmit for microprocessor, and finally, calculating the water activity of the sample by a water activity calculation algorithm built in the microprocessor.
Principle of determination of water activity of sample: in the closed space, the ratio of the equilibrium vapor pressure P of the sample to the saturated vapor pressure P0 of pure water at the same temperature is the water activity Aw of the sample, and the unit is Aw.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: it is to be understood that modifications may be made to the above-described arrangements in the embodiments or equivalents may be substituted for some of the features of the embodiments, but such modifications or substitutions do not depart from the spirit and scope of the present invention.
Claims (4)
1. A water activity detector comprising: the touch screen is connected with the microprocessor; it is characterized by also comprising:
the first fixed seat and the second fixed seat are fixed on the lower shell;
the base is connected with the first fixing seat and the second fixing seat through a rotating shaft;
a knob fixing component for connecting the base and the lower shell;
the mounting groove and the groove are arranged on the inner side of the base;
an infrared temperature sensor and a pressure sensor which are arranged in the mounting groove;
the sample preheating position and the sample detection position are arranged on the lower shell, the sample preheating position and the groove are arranged correspondingly, and the sample detection position and the infrared temperature sensor are arranged correspondingly;
the first heating device is arranged in the lower shell and is positioned at the lower end of the sample preheating position;
the second heating device is arranged in the lower shell and is positioned at the lower end of the sample detection position;
the pressure sensor is arranged in the lower shell and positioned at the lower end of the sample detection position, and the pressure sensor is connected with the sample detection position;
the infrared temperature sensor, the pressure sensor, the first heating device and the second heating device are all connected with the microprocessor.
2. A water activity detector according to claim 1, further comprising: the first strip-shaped hole is formed in the edge of the inner side of the base.
3. A water activity detector according to claim 2, further comprising: and the second strip-shaped hole is formed in the lower machine shell and corresponds to the first strip-shaped hole.
4. A water activity monitor according to claim 3, wherein the knob retaining assembly comprises: the rotary knob is arranged in a mounting hole on the front side surface of the base, the buckle is fixed on the outer side of the rack block and arranged in the first strip-shaped hole, the clamping block is arranged in the second strip-shaped hole, the driving shaft is fixed at the center of the lower end of the rotary knob, the gear is fixed at the lower end of the driving shaft, the rack block is meshed with the gear, and the first sliding rail and the second sliding rail are fixed on the inner wall of the base;
the first slide rail and the second slide rail are oppositely arranged; the first sliding rail and the second sliding rail are both provided with bulges;
the upper side and the lower side of the rear end of the rack block are respectively provided with a sliding chute, the bulge of the first sliding rail is arranged in the sliding chute at the upper side of the rack block, and the bulge of the second sliding rail is arranged in the sliding chute at the lower side of the rack block;
the buckle is provided with a clamping groove, and the clamping block is arranged in the clamping groove of the buckle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023272292.4U CN214150291U (en) | 2020-12-29 | 2020-12-29 | Water activity detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023272292.4U CN214150291U (en) | 2020-12-29 | 2020-12-29 | Water activity detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214150291U true CN214150291U (en) | 2021-09-07 |
Family
ID=77544445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023272292.4U Active CN214150291U (en) | 2020-12-29 | 2020-12-29 | Water activity detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214150291U (en) |
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2020
- 2020-12-29 CN CN202023272292.4U patent/CN214150291U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
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| CP02 | Change in the address of a patent holder |
Address after: 130000 room 1401, 14th floor, Zhongguancun innovation center, high tech Zone, Changchun City, Jilin Province Patentee after: Jilin aigrui Technology Co.,Ltd. Address before: Room 501, unit 1, floor 5, building 4, south of Jinhu Road, east of Chaofan street, high tech Industrial Development Zone, Changchun City, Jilin Province, 130000 Patentee before: Jilin aigrui Technology Co.,Ltd. |