CN106442138B - Method and device for measuring gel strength - Google Patents
Method and device for measuring gel strength Download PDFInfo
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- CN106442138B CN106442138B CN201611034814.2A CN201611034814A CN106442138B CN 106442138 B CN106442138 B CN 106442138B CN 201611034814 A CN201611034814 A CN 201611034814A CN 106442138 B CN106442138 B CN 106442138B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0092—Visco-elasticity, solidification, curing, cross-linking degree, vulcanisation or strength properties of semi-solid materials
Abstract
The invention relates to a method and a device for measuring gel strength, which are characterized in that: 1) preparing a measuring device and a gel solution with the mass percentage of 1.5%; 2) placing the gel on a gravity sensing platform of a measuring device; 3) utilizing a data zero clearing key of a keyboard of the measuring device to zero the weight data of the measuring device; 4) adjusting a ratchet adjusting screw of the measuring device to enable the detection head to be pressed on the surface of the gel to be measured, and driving the detection head to apply pressure to the surface of the gel by the spiral expansion piece; 5) collecting information of pressure borne by the surface of the gel by using a gravity sensor on the bottom surface of a gravity sensor platform, and sending the information to a control processing unit for processing after analog-to-digital conversion by an A/D conversion module of a measuring device; 6) when the gel is broken by gravity, the control processing unit locks the maximum pressure to which the gel is subjected to the broken front surface and the duration of the maximum pressure. The invention has the characteristics and beneficial effects of simple structure of detection equipment, high precision, short measurement time, high efficiency and the like.
Description
Technical Field
The invention relates to a method and a device for measuring gel strength, which are particularly suitable for measuring the gel strength of agar, carrageenan and the like. Belongs to the technical field of chemical product detection equipment.
Background
At present, food additives such as agar, carrageenan and the like are widely applied to the technical fields of food, medicine, biology, chemical industry and the like, and the demand at home and abroad is very large. Since gel strength is an important index of gels such as agar and carrageenan, it is necessary to detect the strength of gels such as agar and carrageenan.
In the prior art, the strength of gels such as agar and carrageenan is mainly detected by a constant pressure rupture method, a water pressure method, a physical property tester Pheo Meter method and the like.
And (3) a cracking method: the time from the beginning to the end of the cake was recorded as the final point when the weight-increasing device was inserted into the middle of the cake, by dropping 10 weight-increasing hammer trains simultaneously and pressing each of the 10 standard gel samples, and by noting the moment when the cake was completely weighted, reading the seconds of the stopwatch and noting that the end face of the device began to crack and break on the surface of the cake. The gel can withstand the ultimate pressure (g/cm2) required for 20 seconds without breaking. The measuring method has the defects of complex equipment structure, complex operation, low precision and the like.
A hydraulic method: placing the gel to be measured on the right side of the tray, placing a 1000 ml beaker on the left side of the tray, adding a weight to keep the balance, adding distilled water into the left beaker at the speed of 200 ml per minute, and stopping adding water when the surface of the gel is cracked and holes are formed. The number of milliliters of 1000 milliliters of beaker water was recorded. The method has the defects of difficult control of the speed of water flow, low measurement precision, no time for considering the limit pressure when the hole is formed by cracking and the like.
Physical property tester Pheo Meter assay: the sample to be tested is placed on a test material table of an instrument, the test material table is moved upwards to a pressure sensing head by manual operation at the speed of 2cm/min, and when the pressure sensing head is pressed into the surface of gel and just breaks (forms a hole), a peak value of force appears. The maximum peak is shown on the gauge when the pressure head just breaks (holes) into the gel surface. Since it is the reading of the needle, the oscillation is large, the pressure suddenly decreases when the gel surface just breaks, and the needle also changes rapidly. The accuracy of the readings can vary greatly due to differences in human eye and brain responses. Meanwhile, when the crack is not considered to form a hole, the limiting pressure time is an important influence factor. There are various important parameters (pressure to break the gel surface, duration of the pressure to break the gel, and temperature at the time of measurement) that fail to accurately measure the gel strength of agar, carrageenan
Day cold water type: it is the maximum pressure that 1cm2 can withstand after 20S rupture at 20 ℃ standard temperature. Because its structure is complicated, the operation is inconvenient, will add the weight according to the soft or hard condition of gel, weight is not controlled well, and the impact force that adds the weight moreover all can cause the influence to the precision of measurement, and the error on the time measurement of the maximum pressure that bears simultaneously is great, needs the measuring time as long as 20S, is difficult to control. The defects of complex structure, low precision, long measuring time, low efficiency and the like of the detection equipment exist.
Disclosure of Invention
The invention aims to solve the problems of complex structure, low precision, long measurement time, low efficiency and the like of the detection equipment in the existing known gel strength measurement method, and provides a gel strength measurement method. The measuring method has the characteristics of high detection precision, short measuring time, high efficiency and the like.
The second purpose of the present invention is to provide a device for measuring gel strength. The measuring device has the characteristics of simple structure, high detection precision, short measuring time and the like.
One of the purposes of the invention can be achieved by adopting the following technical scheme:
a method for measuring gel strength is characterized by comprising the following steps:
1) preparing a measuring device and a gel solution with the mass percentage of 1.5%;
2) standing the 1.5% gel solution at room temperature for 10-15 hours to solidify the gel solution into gel; then placing the gel on a gravity sensing platform of a measuring device;
3) utilizing a data zero clearing key of a keyboard of the measuring device to zero the weight data of the measuring device, so that when the gel to be measured bears the maximum pressure, the data of other gravity of the measured gel except the pressure of the detection head is excluded;
4) adjusting a ratchet adjusting screw of the measuring device to enable the detection head to be pressed on the surface of the gel to be measured, pressing a starting key of a keyboard of the measuring device, then slowly adjusting a spiral expansion piece of the measuring device to drive the detection head to apply pressure to the surface of the gel, and gradually increasing the applied pressure from small to small;
5) collecting information of pressure borne by the surface of the gel by using a gravity sensor on the bottom surface of a gravity sensor platform, and sending the information to a control processing unit for processing after analog-to-digital conversion by an A/D conversion module of a measuring device;
6) when the gel is broken by gravity, the gravity sensor detects that the pressure is suddenly reduced, and the control processing unit locks the maximum pressure borne by the surface of the gel before the gel is broken and the duration of the maximum pressure;
7) the temperature probe is used for detecting the temperature of the surface of the gel, and the acquired temperature data is sent to the control processing unit so as to solve the influence of the temperature environment on the measurement at the moment;
8) the maximum pressure, the duration of the maximum pressure, and the temperature measured at that time are displayed by the control processing unit through the liquid crystal display of the measuring device to read the maximum pressure, the duration of the maximum pressure, and the temperature measured at that time.
One of the purposes of the invention can be achieved by adopting the following technical scheme:
furthermore, the storage keys of the keyboard are utilized to store the parameters of time, temperature and maximum pressure of the current measurement, and the group measurement data can be continuously stored.
Furthermore, the saved data are sequentially read by utilizing the reading keys of the keyboard.
The second purpose of the invention can be achieved by adopting the following technical scheme:
the utility model provides a measuring device of gel strength, includes the support, its structural feature lies in: an elastic supporting table and a gravity sensing platform are sequentially arranged on the bottom surface of the support upwards, and a pressure sensor is arranged on the bottom surface of the gravity sensing platform; the upper part of the bracket is provided with a spiral expansion piece, the power input end of the spiral expansion piece is connected with a pressure applying ratchet wheel, and the power output end of the spiral expansion piece is connected with a detection head, so that a spiral expansion type pressure applying mechanism is formed; the pressure detection head of the pressure sensor is contacted with the bottom surface of the gravity sensing platform, the signal output end of the pressure sensor is connected with the signal input end of the A/D conversion module, the signal output end of the A/D conversion module is connected with one I/O end of the control processing unit, and the other I/O end of the control processing unit is connected with the signal output end of the temperature detector, so that an intelligent pressure and temperature detection structure is formed; the third I/O end of the control processing unit is connected with a keyboard, and the fourth I/O port is connected with a display screen to form a manual input and display structure.
The second purpose of the invention can be achieved by adopting the following technical scheme:
furthermore, the elastic supporting table can be composed of a supporting panel and two to four compression springs, and the supporting panel is fixedly connected with the bottom surface of the support through the compression springs to form a telescopic elastic structure.
Further, the power output end of the spiral expansion piece can be connected with the detection head through a connector.
Further, the control processing unit can be formed by a single chip microcomputer MCU.
Further, the a/D conversion module may be formed by an a/D conversion chip HX 711.
Further, the detection head may be 1cm2A cylinder of cross-sectional area.
The invention has the following outstanding advantages:
1. the invention adopts the spiral fine-tuning expansion piece, can slowly adjust the downward pressing of the detection head, and introduces the compression spring to effectively reduce the relative displacement between the gel surface and the contact surface, so that the adjustment precision of the pressure applied to the gel surface by the detection head is greatly improved; therefore, the method can solve the problems of complex structure, low precision, long measuring time, low efficiency and the like of the detection equipment in the existing known gel strength measuring method, and has the characteristics and beneficial effects of simple structure, high precision, short measuring time, high efficiency and the like of the detection equipment.
2. The invention is adjusted by screw fine adjustment and control, and meanwhile, the pressure is assisted to be slowed down by the spring, so that the measurement precision is improved; the gravity sensor is used for collecting pressure information and the duration, so that the measurement accuracy is greatly improved, and important factors influencing the gel strength are comprehensively reflected; the temperature information during measurement at that time is measured through the temperature sensor, so that the influence of the temperature environment on the measurement is solved; the information that the control processing unit who constitutes through the singlechip chip gathered is handled, preserves maximum pressure intelligently, bears time and the temperature that maximum pressure lasts to show through liquid crystal display, it is directly perceived simple.
3. The invention effectively improves the precision by introducing the gravity sensor, and eliminates the influence of the environmental temperature on the measured value by introducing the temperature probe which can monitor the temperature during measurement. The MCU can accurately lock the maximum pressure bearing time and the maximum pressure bearing temperature. The screw fine-tuning telescopic instrument and the compression spring are introduced, so that the applied pressure is accurate and controllable, the pressure accuracy is improved, and the operation is more convenient. The keyboard and the liquid crystal display screen are introduced, so that people can conveniently and visually process information.
Drawings
Fig. 1 is a schematic structural diagram of a specific embodiment of a measuring device according to the present invention.
Detailed Description
Detailed description of the preferred embodiment 1
Referring to fig. 1, the device for measuring gel strength according to the present embodiment includes a support 13, an elastic support platform 1 and a gravity sensing platform 2 are sequentially disposed on a bottom surface of the support 13, and a pressure sensor is disposed on a bottom surface of the gravity sensing platform 2; a spiral expansion piece 6 is arranged at the upper part of the bracket 13, the power input end of the spiral expansion piece 6 is connected with a pressure applying ratchet wheel 7, and the power output end is connected with a detection head 4, so that a spiral expansion type pressure applying mechanism is formed; the pressure detection head of the pressure sensor is contacted with the bottom surface of the gravity sensing platform 2, the signal output end of the pressure sensor is connected with the signal input end of an A/D conversion module 12, the signal output end of the A/D conversion module 12 is connected with one I/O end of a control processing unit 8, and the two I/O ends of the control processing unit 8 are connected with the signal output end of a temperature detector 11, so that an intelligent pressure and temperature detection structure is formed; the third I/O end of the control processing unit 8 is connected with a keyboard 10, and the fourth I/O end is connected with a display screen 9, so as to form a manual input and display structure.
In this embodiment:
the elastic supporting table 1 is composed of a supporting panel 1-1 and two to four compression springs 1-2, and the supporting panel 1-1 is fixedly connected with the bottom surface of the support through the compression springs 1-2 to form a telescopic elastic structure.
And the power output end of the spiral expansion piece 6 is connected with the detection head 4 through a connector. The helical jack 6 is constituted by a helical jack of a conventional art.
The control processing unit 8 is composed of a single chip microcomputer MCU of the conventional technology.
The a/D conversion module 12 is composed of an a/D conversion chip HX711 of a conventional technology.
The detection head 5 is 1cm2A cylinder of cross-sectional area.
The method for measuring the gel strength is characterized by comprising the following steps:
1) preparing a measuring device and a gel solution with the mass percentage of 1.5%;
2) standing the 1.5% gel solution at room temperature for 10-15 hours to solidify the gel solution into gel; then placing the gel on a gravity sensing platform of a measuring device;
3) utilizing a data zero clearing key of a keyboard 10 of the measuring device to zero the weight data of the measuring device, so that when the gel to be measured bears the maximum pressure, the data of other gravity of the measured gel except the pressure of the detection head is eliminated;
4) adjusting a ratchet adjusting screw 7 of the measuring device to enable the detection head 4 to be pressed on the surface of the gel 3 to be measured, pressing a starting key of a keyboard 10 of the measuring device, then slowly adjusting a spiral expansion piece 6 of the measuring device to drive the detection head 5 to apply pressure to the surface of the gel 3, wherein the applied pressure is gradually increased from small;
in practical application, due to the adoption of the spiral fine-adjustment expansion piece, the downward pressing of the detection head can be slowly adjusted, and the compression spring is introduced, so that the relative displacement between the gel surface and the contact surface can be effectively reduced, and the adjustment precision of the pressure applied to the gel surface by the detection head is greatly improved.
5) The gravity sensor 2 on the bottom surface of the gravity sensor platform is used for acquiring information of the pressure borne by the gel surface, and the information is subjected to analog-to-digital conversion by an A/D conversion module 12 of the measuring device and then is sent to a control processing unit 8 for processing;
in practical application, the accuracy of the force sensor is high, so that the accuracy of measured data is greatly improved, and the measured data is accurate, stable and convenient to adjust.
6) When the gel is broken by gravity, the gravity sensor 2 detects that the pressure is suddenly reduced, and the control processing unit 8 locks the maximum pressure borne by the surface of the gel before being broken and the duration of the maximum pressure;
7) the temperature probe 11 is used for detecting the temperature of the surface of the gel, and the acquired temperature data is sent to the control processing unit 8, so that the influence of the temperature environment on the measurement at the moment is solved;
8) the maximum pressure to be applied, the duration of the maximum pressure to be applied, and the temperature measured at that time are displayed by the control processing unit 8 through the liquid crystal display 9 of the measuring device to read the maximum pressure, the duration of the maximum pressure, and the temperature measured at that time.
The storage keys of the keyboard 10 are used for storing the parameters of time, temperature and maximum pressure of the current measurement, and 10 groups of measurement data can be continuously stored. The stored data are sequentially read by using the read key of the keyboard 10.
As shown in fig. 1, the pressure for measuring the gel strength is adjusted, and the operation process comprises the following steps:
control process for the measured pressure: firstly, adjusting the ratchet adjusting screw 7 to ensure that the detection head 4 just presses the surface of the gel 3 to be detected, and pressing a starting key of the keyboard 10; then slowly adjusting the spiral expansion piece 6 to drive the detection head 5 (a cylinder with the cross section area of 1cm 2) to apply pressure on the surface of the gel 3, wherein the pressure is gradually increased from small; because the spiral fine-tuning expansion piece is adopted, the downward pressing of the detection head can be slowly adjusted, and the compression spring is introduced, so that the relative displacement between the gel surface and the contact surface can be effectively reduced, and the adjustment precision of the pressure applied to the gel surface by the detection head is greatly improved.
Information acquisition of the applied pressure values its workflow: the gravity sensor collects pressure information, the pressure information is subjected to analog-to-digital conversion through the A/D module 12 with the model number of HX711 and then is sent to the single chip microcomputer MCU, the single chip microcomputer MCU carries out processing, and parameters of the maximum pressure and the borne maximum pressure are intelligently locked by utilizing the characteristic that the pressure is suddenly reduced when the surface of gel is broken. Because the accuracy of the force sensor is high and the clock calculation accuracy of the MCU is high, the accuracy of the measured data is greatly improved. Accurate, stable and convenient adjustment.
The work flow of the information acquisition for measuring the environmental temperature value is that the temperature probe 11 also sends the acquired data to the MCU.
The parameters of temperature, time and maximum pressure measured this time can be saved by the saving button of the keyboard 10, and 10 data can be continuously saved. The saved data can be read one time by a 10-key disk reading button.
The invention relates to a high-precision gel strength measuring instrument, which also considers the important factors influencing the accuracy of the gel strength, such as the pressure when breaking the gel surface, the duration when breaking the gel surface and the temperature. The equipment is simple and the cost is low. Convenient operation, simplicity, accuracy, intuition, stability and the like.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution of the present invention and the inventive concept within the scope of the present invention.
Claims (7)
1. A device for measuring gel strength, comprising a support (13), characterized in that: an elastic supporting table (1) and a gravity sensing platform (2) are sequentially arranged on the bottom surface of the support (13) upwards, and a pressure sensor is arranged on the bottom surface of the gravity sensing platform (2); the elastic supporting platform (1) is composed of a supporting panel (1-1) and two to four compression springs (1-2), and the supporting panel (1-1) is fixedly connected with the bottom surface of the support through the compression springs (1-2) to form a telescopic elastic structure; a spiral expansion piece (6) is arranged at the upper part of the bracket (13), the power input end of the spiral expansion piece (6) is connected with a pressure applying ratchet wheel (7), and the power output end of the spiral expansion piece is connected with a detection head (4), so that a spiral expansion type pressure applying mechanism is formed; a pressure detection head of the pressure sensor is contacted with the bottom surface of the gravity sensing platform (2), a signal output end of the pressure sensor is connected with a signal input end of an A/D conversion module (12), the signal output end of the A/D conversion module (12) is connected with one I/O end of a control processing unit (8), and the two I/O ends of the control processing unit (8) are connected with a signal output end of a temperature detector (11), so that an intelligent pressure and temperature detection structure is formed; the third I/O end of the control processing unit (8) is connected with a keyboard (10), and the fourth I/O end is connected with a display screen (9) to form a manual input and display structure;
the method for measuring the gel strength by adopting the device comprises the following steps:
1) preparing a measuring device and a gel solution with the mass percentage of 1.5%;
2) standing the 1.5% gel solution at room temperature for 10-15 hours to solidify the gel solution into gel; then placing the gel on a gravity sensing platform of a measuring device;
3) utilizing a data zero clearing key of a keyboard (10) of the measuring device to zero the weight data of the measuring device, so that when the gel to be measured bears the maximum pressure, the data of other gravity of the measured gel except the pressure of the detection head is eliminated;
4) adjusting a ratchet adjusting screw (7) of the measuring device to enable the detection head (4) to be pressed on the surface of the gel (3) to be measured, pressing a starting key of a keyboard (10) of the measuring device, then slowly adjusting a spiral expansion piece (6) of the measuring device to drive the detection head (4) to apply pressure to the surface of the gel (3), and gradually increasing the applied pressure from small to small;
5) the gravity sensor (2) on the bottom surface of the gravity sensor platform is used for acquiring information of pressure borne by the gel surface, and the information is subjected to analog-to-digital conversion by an A/D conversion module (12) of the measuring device and then is sent to a control processing unit (8) for processing;
6) when the gel is broken by gravity, the gravity sensor (2) detects that the pressure is suddenly reduced, and the control processing unit (8) locks the maximum pressure borne by the broken front surface of the gel and the duration of the maximum pressure;
7) the temperature probe (11) is used for detecting the temperature of the surface of the gel, and the acquired temperature data is sent to the control processing unit (8) so as to solve the influence of the temperature environment on the measurement at the moment;
8) the maximum pressure, the duration of the maximum pressure, and the temperature measured at that time are displayed by a control processing unit (8) through a liquid crystal display (9) of the measuring device to read the maximum pressure, the duration of the maximum pressure, and the temperature measured at that time.
2. A device for measuring gel strength as claimed in claim 1, wherein: and the storage keys of the keyboard (10) are utilized to store the parameters of time, temperature and maximum pressure of the current measurement, and 10 groups of measurement data can be continuously stored.
3. A device for measuring gel strength as claimed in claim 1, wherein: and sequentially reading the stored data by using the reading keys of the keyboard (10).
4. A device for measuring gel strength as claimed in claim 1, wherein: the power output end of the spiral expansion piece (6) is connected with the detection head (4) through a connector.
5. A device for measuring gel strength as claimed in claim 1, wherein: the control processing unit (8) is composed of a single chip microcomputer MCU.
6. A device for measuring gel strength as claimed in claim 1, wherein: the A/D conversion module (12) is composed of an A/D conversion chip HX 711.
7. A device for measuring gel strength as claimed in claim 1, wherein: the detection head (5) is a cylinder with the cross section area of 1cm 2.
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| CN201611034814.2A CN106442138B (en) | 2016-11-23 | 2016-11-23 | Method and device for measuring gel strength |
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| CN201611034814.2A CN106442138B (en) | 2016-11-23 | 2016-11-23 | Method and device for measuring gel strength |
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| CN114441323A (en) * | 2021-12-24 | 2022-05-06 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | Double-acting-cylinder coordinated loading test bed and coordinated loading test method |
| CN115219335B (en) * | 2022-09-20 | 2022-12-20 | 泉州市壹合食品研究院有限公司 | Jelly gel strength tester and testing method thereof |
| CN115931560B (en) * | 2022-12-19 | 2023-10-03 | 武汉泰科生物技术有限公司 | Agar gel strength detection device |
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| CN205607755U (en) * | 2016-04-22 | 2016-09-28 | 嘉善金亿精密铸件有限公司 | Pressure test device with shock -absorbing structure |
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