CN117686307A - Control method for different water contents in uniaxial compression mechanical test of solid potassium salt ore - Google Patents
Control method for different water contents in uniaxial compression mechanical test of solid potassium salt ore Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 130
- 238000012360 testing method Methods 0.000 title claims abstract description 114
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000007787 solid Substances 0.000 title claims abstract description 31
- 230000006835 compression Effects 0.000 title claims abstract description 18
- 238000007906 compression Methods 0.000 title claims abstract description 18
- 238000001035 drying Methods 0.000 claims abstract description 98
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims abstract description 89
- 239000001103 potassium chloride Substances 0.000 claims abstract description 82
- 235000011164 potassium chloride Nutrition 0.000 claims abstract description 82
- 238000005520 cutting process Methods 0.000 claims abstract description 15
- 238000005303 weighing Methods 0.000 claims abstract description 12
- 239000008239 natural water Substances 0.000 claims abstract description 10
- 238000005485 electric heating Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 5
- 230000004069 differentiation Effects 0.000 claims description 2
- 230000010354 integration Effects 0.000 claims description 2
- 238000009529 body temperature measurement Methods 0.000 claims 1
- 238000011160 research Methods 0.000 abstract description 5
- 238000010521 absorption reaction Methods 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 235000002639 sodium chloride Nutrition 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical class [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- PALNZFJYSCMLBK-UHFFFAOYSA-K magnesium;potassium;trichloride;hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[Cl-].[Cl-].[Cl-].[K+] PALNZFJYSCMLBK-UHFFFAOYSA-K 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The invention relates to a method for controlling different water contents in a uniaxial compression mechanical test of solid potassium salt ore, and relates to the technical field of research on mechanical properties of potassium salt ore. Cutting sylvite to obtain cuboid sylvite ore; coring cuboid potassium salt ore to obtain cylindrical potassium salt ore; preparing a standard test piece for cylindrical sylvite ore; standing the standard test piece for 24 hours at room temperature under the condition of natural humidity; drying the sylvite test piece in a natural water-containing state to a free water-free state to obtain a dried or semi-dried cylindrical sylvite ore test piece; completely drying, weighing and comparing the quality of the cylindrical sylvite ore test piece in a natural state with that before drying, calculating the water content of the cylindrical sylvite ore test piece, and obtaining a water content average value; and taking the average value of the water content as a reference, and drying at different times to control different water contents. According to the invention, the ore can reach different water contents by controlling the drying time, so that more accurate mechanical property test can be performed.
Description
Technical Field
The invention relates to the technical field of underground solid potassium salt ore mechanical property research, in particular to a method for controlling different water contents in a solid potassium salt ore uniaxial compression mechanical test.
Background
Potassium salt has wide application and high demand in the economic field (such as agriculture, chemical industry, medicine, metallurgy, electroplating, printing and dyeing, glass and the like), and one important source is underground mining of solid potassium salt ores. Since the underground mining environment of the potash salt ore belongs to a typical high-humidity environment, the strength of a potash salt ore column is deteriorated under the environment, so that the stability of the ore column and a stope is affected, and therefore, the research on the water absorption degradation characteristics of the solid potash salt ore is an important research direction. At present, uniaxial compression tests of sylvite ores under different water contents are commonly used for carrying out water absorption degradation researches, and in the tests, the control of the water content of a solid sylvite ore sample is important to ensure the accuracy of test results. However, due to the special components of the sylvite ore, the test piece with different water contents is prepared by adopting a common rock mechanical water absorption mode (namely, after the test piece is completely dried, water is added to control the water contents), so that the test piece is corroded and damaged, and the mechanical property test result is affected.
The main problems of the existing preparation of solid sylvite water-containing test pieces are that the water quantity control is inaccurate and the surface sylvite is easy to dissolve in water, so that the common soaking water-absorbing method and the like cannot meet the requirements of tests. The prior art (patent number is CN 202210585042.0) discloses an automatic dry-wet cycle test device, which comprises a cycle filter box, a bracket, a drying cover plate, a water feeder, a control switch and a rotating motor, so that a sample is in a dry-wet cycle environment, repeatedly absorbs water and dries, and finally the internal structure is irreversibly changed. The prior art realizes automation of the dry-wet cycle test, and a plurality of groups of samples are simultaneously subjected to batch test operation. The device needs to put the sample into water when carrying out dry-wet cycle test, through repeated water absorption, stoving for final sample internal structure takes place irreversible change, then accessible unipolar compression mechanical properties test is tested the material, and this kind of method if be applied to potassium salt ore, has the defect of three aspects, and firstly dry-wet cycle test needs to put potassium salt into water, because water and potassium salt take place the reaction, the soluble part of potassium salt takes place to dissolve, produces great influence to its structure and mechanical test result. And secondly, compared with single water absorption or drying, the dry-wet cycle has larger difference in mechanical properties of the final ore and obtained results. And the condition of dry and wet circulation under the mine is less. The reference meaning is not great. Thirdly, adding external water after drying, wherein the external water component is different from the water component absorbed by the sylvine mine under the mine, and the control of the variable is difficult.
Therefore, how to provide a control method for different water contents in a uniaxial compression mechanical test of solid potassium salt ores becomes a technical problem which needs to be solved by the technicians in the field.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art, and provides a method for controlling different water contents in a solid sylvite ore uniaxial compression mechanical test, which can accurately control different water contents of a sylvite sample by controlling the drying time and measuring the difference of weighing data before and after measurement, so that the influence except water can be avoided to a greater extent, and the sylvite ore with different water contents can be prepared on the basis of avoiding the reaction of external water and sylvite ore.
In order to achieve the purpose, the invention provides a method for controlling different water contents in a uniaxial compression mechanical test of solid potassium salt ores, which comprises the following steps:
s1, cutting unprocessed sylvite obtained from an underground solid sylvite stope by using a sylvite cutting machine to obtain large-block regular approximately cuboid sylvite ore;
s2, putting the cuboid sylvite ore into a coring machine, and coring through the coring machine to obtain cylindrical sylvite ore;
s3, preparing a standard test piece of the cylindrical sylvite ore by adopting a linear cutting method;
s4, standing each test piece to be tested for 24 hours at room temperature under the natural humidity condition;
s5, drying the potassium salt test piece in a natural water-containing state to a free water-free state by using an electric heating constant temperature drying oven to obtain a dried or semi-dried cylindrical potassium salt ore test piece;
s6, completely drying, weighing and comparing a plurality of cylindrical sylvite ore test pieces in a natural state with the mass before drying, calculating the water content of the cylindrical sylvite ore test pieces in the natural state, and obtaining a water content average value;
and S7, drying for different times by taking the average value of the water content as a reference, and recording the water content corresponding to each time, so that each time has one water content corresponding to the water content, and the control of different water contents is achieved.
Further, the drying conditions of the dried or semi-dried cylindrical sylvite test piece are: heating the natural sylvite column to 100 ℃, continuously drying for 15 minutes, and drying the sylvite test piece in a natural water-containing state to a free water-free state to obtain a dried sylvite ore test piece; and heating the natural sylvite column to 100 ℃, continuously drying for 5 minutes, and drying the sylvite test piece in the natural water-containing state until the sylvite test piece contains partial free water state to obtain the semi-dried sylvite ore test piece.
Further, the water content a 1 The calculation formula is as follows:
；
wherein a is 1 The water content of the natural test piece; m is m 2 Is self-containedThe mass of the test piece in the state is given in g; m is m 1 The mass of the test piece in a dry state is expressed in g.
Furthermore, the electric heating constant temperature drying box is characterized in that the heating pipe is controlled by the intelligent LED digital display instrument to heat the inner container, intelligent fine adjustment is performed after the temperature reaches the set temperature so as to keep the constant temperature state of the inner container, and the electric heating constant temperature drying box adopts a PID (proportion integration differentiation) regulation mode and has the functions of adjusting the output power and linearly correcting the temperature of the system.
The invention has the beneficial effects that:
the invention provides a control method for different water contents in a solid potassium salt ore uniaxial compression mechanical test, which is used for accurately controlling different water contents of a potassium salt sample by controlling drying time and measuring weighing data difference before and after measurement, so that other influences except water can be avoided to a greater extent, and a potassium salt ore test piece with different water contents is prepared on the basis of avoiding the reaction of external water and the potassium salt ore; the invention provides the method for controlling the water content of the potassium salt sample by using different drying time to replace the traditional method for controlling the water content of the potassium salt sample by adding water after complete drying, and the method has a certain practical significance for controlling the water content of the potassium salt ore and other rock salts in experiments, and can control the water content of the potassium salt ore and other rock salts under the condition of not changing the internal structure of the ore.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a graph showing the relationship between moisture content and test piece for drying according to the present invention;
fig. 3 is a comparative diagram of the drying state of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the present application described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are used primarily to better describe the present application and its embodiments and are not intended to limit the indicated device, element or component to a particular orientation or to be constructed and operated in a particular orientation.
Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "mounted," "configured," "provided," "connected," "coupled," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
The solid sylvite ore can erode and degrade when contacting with the water vapor in the well, so that the mechanical strength of the solid sylvite ore is lowered, and the pressure bearing capacity of the solid sylvite ore is lowered. When the influence test of the water content on the mechanical property of the solid potassium salt ore is carried out, if the traditional method of completely drying and then adding water to control different water contents is adopted, the fact that the ore is eroded and the internal structure is changed if the water content is increased by dripping water is found. Therefore, it is proposed to control the drying time to achieve different water contents of the ore in order to perform more accurate mechanical property tests.
The control of the water content is a key core technology for preparing a solid sylvite test piece under different humidity conditions. The main problems of the existing preparation of solid sylvite water-containing test pieces are that the water quantity control is inaccurate and the surface sylvite is easy to dissolve in water, so that the common soaking water-absorbing method and the like cannot meet the requirements of tests.
As shown in FIG. 1, the invention provides a method for controlling different water contents in a uniaxial compression mechanical test of solid potassium salt ores, which comprises the following steps:
s1, cutting unprocessed sylvite obtained from an underground solid sylvite stope by using a sylvite cutting machine to obtain large-block regular approximately cuboid sylvite ore;
s2, putting the cuboid sylvite ore into a coring machine, and coring through the coring machine to obtain cylindrical sylvite ore;
s3, taking the characteristic that sylvite with carnallite as a main component is deliquescent and water-soluble into consideration, and preparing a standard test piece by adopting a linear cutting method. Cutting cylindrical sylvite ore on a cutting machine in a linear cutting mode to prepare a sylvite standard component, wherein the specification of the sylvite standard component is phi 50 multiplied by 100mm;
s4, standing each test piece to be tested for 24 hours at room temperature under the natural humidity condition, wherein the natural test piece is not treated, and then preparing a dry test piece and a water-containing test piece;
s5, drying the potassium salt test piece in the natural water-containing state to a free water-free state by using an electric heating constant temperature drying oven to obtain a dried or semi-dried potassium salt rock standard piece; the drying conditions for the dried or semi-dried sylvite standard were: heating the natural sylvite column to 100 ℃, continuously drying for 15 minutes, and drying the sylvite test piece in a natural water-containing state to a free water-free state to obtain a dried sylvite ore test piece; heating the natural sylvite column to 100 ℃, continuously drying for 5 minutes, and drying the sylvite test piece in a natural water-containing state to a free water-free state to obtain a semi-dry sylvite ore test piece;
s6, completely drying and weighing a plurality of sylvite standard components in a natural state, comparing the dried sylvite standard components with the mass before drying, calculating the water content of a cylindrical sylvite ore test piece in the natural state, and obtaining a water content average value;
and S7, drying for different times by taking the average value of the water content as a reference, thereby achieving the control of different water contents.
In this example, the water content a 1 The calculation formula is as follows:
；
wherein a is 1 The water content of the natural test piece; m is m 2 The mass of the test piece in a natural state is expressed as g; m is m 1 The mass of the test piece in a dry state is expressed in g.
In the embodiment, the heating pipe is controlled by the intelligent LED digital display instrument to heat the inner container, the intelligent fine adjustment is performed after the temperature reaches the set temperature to keep the constant temperature state of the inner container, the PID regulation mode is adopted, and the intelligent LED digital display instrument has the functions of adjusting the output power and linearly correcting the temperature of the system. The electric heating constant temperature drying oven selected by the invention can not change the structure and the property of the electric heating constant temperature drying oven, and can show the surface crack structure of the electric heating constant temperature drying oven, thereby facilitating the experimental study; the electric heating constant temperature drying oven is used for drying test, and the effect of precisely drying to control the water content is achieved through the cooperation of all the systems.
The invention provides a method for controlling different water contents in a solid potassium salt ore uniaxial compression mechanical test based on drying time control, which comprises the following steps: 1) Cutting and coring the sylvite ore collected in the underground sylvite mine to obtain a standard test piece. The standard potassium salt test pieces with different water contents are manufactured by dividing the standard potassium salt test pieces into different groups, wherein the groups are natural conditions, drying conditions and conditions with different water contents respectively. Because the potassium salt absorbs water and is easy to deliquesce and erode, the invention aims at providing a stable and controllable water absorption mode which does not damage the surface shape of a material aiming at a potassium salt test piece and the like which is easy to dissolve in water. 2) And a proper electric heating constant temperature drying oven is used for obtaining potassium salt test pieces under different water-containing states so as to carry out uniaxial compression experiments, and due to the corrosion of water on the surface and in the potassium salt, the uniaxial compression strength of potassium salt ores with different water contents is obviously different, the internal structure of the potassium salt ores is changed after the potassium salt ores absorb water, the porosity is increased, the water absorption degradation occurs, and the mechanical strength is reduced, so that the drying method can better realize the control of the water content. The method can provide a reliable experimental means for laboratory study of the water absorption degradation characteristics of the sylvite ore, and provides a theoretical basis for the stability study of underground mining ore pillars and stopes of sylvite ore deposits.
Unlike the traditional method of adding water to control different water contents after complete stoving, the present invention proposes stoving process for preparing solid potassium salt ore with different water contents, and the process aims at: the solid sylvite ore contains a plurality of components which are easy to dissolve in water, and if the water content is changed by adopting a water absorption method, the sylvite ore can be corroded to a certain extent by any water absorption method, so that the experimental result is affected. And by controlling the drying time and measuring the difference of weighing data before and after the measurement, other influences except water can be avoided to a greater extent, and the potassium salt ores with different water contents are prepared on the basis of avoiding the reaction of the external water and the potassium salt ores.
The invention provides a control method for different water contents in a uniaxial compression mechanical test of solid sylvite ore, which is used for accurately controlling different water contents of a sylvite sample by controlling the drying time and measuring the weighing data difference before and after measurement, so that other influences except water can be avoided to a greater extent, and sylvite ore with different water contents is prepared on the basis of avoiding the reaction of external water and sylvite ore; the invention provides the method for controlling the water content of the potassium salt sample by using different drying time to replace the traditional method for controlling the water content of the potassium salt sample by adding water after complete drying, and the method has a certain practical significance for controlling the water content of the potassium salt ore and other rock salts in experiments, and can control the water content of the potassium salt ore and other rock salts under the condition of not changing the internal structure of the ore.
Examples
(1) Firstly, obtaining a plurality of potassium salt ore standard components through cutting and coring, and then preparing test pieces with different water contents. And obtaining the water content of the test piece under the natural condition by comparing the quality of the test piece under the natural condition with that of the test piece under the dry condition. Then controlling the drying time to make a sylvite ore A (mass m 2 ) Drying, weighing after drying, drying for the second time, weighing again, and if the mass after drying for the second time is the same, the mass is m 1 And proving that the ore has no moisture after the first drying and reaches a complete drying state. And recording the time and temperature after the first drying. Water content a 1 The calculation formula is as follows:
；
wherein a is 1 The water content of the natural test piece; m is m 2 The mass of the test piece in a natural state is expressed as g; m is m 1 The mass of the test piece in a dry state is expressed in g.
(2) And (3) keeping the original drying temperature of the test piece in the new natural state unchanged, reducing the drying time, and repeating the step, wherein if the quality of the test piece after the two times of drying is still the same, the test piece can be completely dried by the current drying time. If the mass of the test piece after the second drying is smaller than that of the test piece after the first drying, the test piece is proved to be not completely dried after the first drying. And (3) recording the time and temperature when weighing is just incomplete drying (the quality is different after the two times of drying) after the two times of drying, wherein the test piece is potassium salt ore B. The water content in this state was calculated and denoted as a 2 . Record the drying time just reaching the drying state as t 0 。
(3) In the phaseAt the same temperature, the time for the first drying is gradually reduced for other potassium salt ore test pieces C, D, E (mass is M) …, and the drying time is t 1 、t 2 …, and then completely drying the test piece, as shown in FIG. 3, so as to obtain the water content of the test piece. The mass after the first drying is marked as M, the mass after the complete drying is marked as M, and the mass after the first drying is the general calculation formula of the water content a in the states is as follows:
；
wherein a is the water content of the test piece; m is the mass of the test piece after the first drying (semi-drying state) and the unit is g; m is the mass of the completely dried (dry state) test piece, and the unit is g.
To sum up, for each drying time t 1 、t 2 … each having a corresponding water content a 1 、a 2 … establishes a relation curve of each moisture content a and the drying time t by searching the relation of the moisture content a and the drying time t, as shown in the following figure 2. The invention provides a method for controlling the moisture content by controlling the drying time, which calculates the moisture content of potassium salt ores by controlling the drying time and weighing the mass, and establishes a relation curve of the moisture content and the drying time, thereby precisely controlling the moisture content of the potassium salt ores.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical principles of the present invention still fall within the scope of the technical solutions of the present invention.
Claims (4)
1. The method for controlling different water contents in the uniaxial compression mechanical test of the solid potassium salt ore is characterized by comprising the following steps of:
s1, cutting unprocessed sylvite obtained from an underground solid sylvite stope by using a sylvite cutting machine to obtain large-block regular cuboid sylvite ore;
s2, putting the cuboid sylvite ore into a coring machine, and coring through the coring machine to obtain cylindrical sylvite ore;
s3, preparing a standard test piece of the cylindrical sylvite ore by adopting a linear cutting method;
s4, standing each test piece to be tested for 24 hours at room temperature under the natural humidity condition;
s5, drying the potassium salt test piece in a natural water-containing state to a free water-free state by using an electric heating constant temperature drying oven to obtain a dried or semi-dried cylindrical potassium salt ore test piece;
s6, completely drying, weighing and comparing a plurality of cylindrical sylvite ore test pieces in a natural state with the mass before drying, calculating the water content of the cylindrical sylvite ore test pieces in the natural state, and obtaining a water content average value;
and S7, drying for different times by taking the average value of the water content as a reference, thereby achieving the control of different water contents.
2. The method for controlling different water contents in a uniaxial compression mechanical test of solid sylvite ore according to claim 1, wherein the drying condition of the dried or semi-dried cylindrical sylvite ore test piece is: heating the natural sylvite column to 100 ℃, continuously drying for 15 minutes, and drying the sylvite test piece in a natural water-containing state to a free water-free state to obtain a dried sylvite ore test piece; and heating the natural sylvite column to 100 ℃, continuously drying for 5 minutes, and drying the sylvite test piece in the natural water-containing state until the sylvite test piece contains partial free water state to obtain the semi-dried sylvite ore test piece.
3. The method for controlling different water contents in uniaxial compression mechanical test of solid potassium salt ore according to claim 2, wherein the water content a is as follows 1 The calculation formula is as follows:
；
wherein a is 1 The water content of the natural test piece; m is m 2 Is self-containedThe mass of the test piece in the state is given in g; m is m 1 The mass of the test piece in a dry state is expressed in g.
4. The method for controlling different water contents in a uniaxial compression mechanical test of solid potassium salt ore according to claim 3, wherein the electrothermal constant temperature drying oven is characterized in that an intelligent LED digital display instrument controls a heating pipe to heat the inner container, intelligent fine adjustment is performed after the temperature reaches a set temperature to keep the constant temperature state of the inner container, a PID (proportion integration differentiation) adjustment mode is adopted, and the electrothermal constant temperature drying oven has the functions of adjusting the output power and linearly correcting the temperature measurement of a system.
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