CN113125220A - Preparation method of coal slime stress measurement sample for fluidized bed - Google Patents
Preparation method of coal slime stress measurement sample for fluidized bed Download PDFInfo
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- CN113125220A CN113125220A CN202110374880.9A CN202110374880A CN113125220A CN 113125220 A CN113125220 A CN 113125220A CN 202110374880 A CN202110374880 A CN 202110374880A CN 113125220 A CN113125220 A CN 113125220A
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- 239000003245 coal Substances 0.000 title claims abstract description 80
- 238000002360 preparation method Methods 0.000 title claims abstract description 34
- 238000005259 measurement Methods 0.000 title claims abstract description 26
- 210000004907 gland Anatomy 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000003825 pressing Methods 0.000 claims abstract description 7
- 230000000694 effects Effects 0.000 claims abstract description 5
- 230000005484 gravity Effects 0.000 claims abstract description 4
- 230000006835 compression Effects 0.000 claims abstract description 3
- 238000007906 compression Methods 0.000 claims abstract description 3
- 238000005336 cracking Methods 0.000 claims description 23
- 230000003014 reinforcing effect Effects 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000012360 testing method Methods 0.000 abstract description 17
- 239000003250 coal slurry Substances 0.000 description 30
- 239000004927 clay Substances 0.000 description 8
- 230000002787 reinforcement Effects 0.000 description 5
- 238000005056 compaction Methods 0.000 description 4
- 230000002265 prevention Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 230000004323 axial length Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000013100 final test Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 229940099259 vaseline Drugs 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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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
- G01N3/14—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by dead weight, e.g. pendulum; generated by springs tension
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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
-
- 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
- G01N2203/003—Generation of the force
- G01N2203/0032—Generation of the force using mechanical means
- G01N2203/0033—Weight
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0298—Manufacturing or preparing specimens
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a preparation method of a coal slime stress measurement sample for a fluidized bed, which comprises the following steps: the sample mold comprises a container with an opening, and the coal slime to be detected is placed into the container; placing a movable gland in said opening of said container; applying pressure to the coal slime to be detected through the movable gland by adopting a lever mechanism; the gravity of the counterweight is used as the power of the lever mechanism; increase gradually the weight of counter weight, work as the activity gland stops the compression correspond when the coal slime that awaits measuring the weight of counter weight does the compactness of the coal slime that awaits measuring corresponds when 100% the first weight of counter weight. The method can be widely applied to the preparation of the coal slime stress measurement sample for the fluidized bed, and the prepared sample can be used for effectively testing various stresses.
Description
Technical Field
The invention relates to a preparation technology of a sample for stress test, in particular to a preparation technology for preparing a sample from coal slime.
Background
Coal cannot be directly utilized after being mined from the underground, and is required to be washed, selected and separated and then utilized according to quality. Coal slime is a high-moisture discharged substance which is separated in the coal washing process, mainly comprises coal particles and contains various impurities. The coal slime runs off when meeting water, is air-dried and flies, and is easy to cause great pollution to the environment, so the coal slime can not be discarded at will and can be effectively utilized at best. The combustion of the circulating fluidized bed is an effective way for utilizing the coal slime in a large scale at present. Aiming at a circulating fluidized bed boiler, the main feeding modes of coal slime are feeding at the top of a hearth, feeding at the middle of the hearth and feeding at the lower part of the hearth. The different feeding modes of the coal slime enable the coal slime to be fed into the furnace in different forms, so that the drying and combustion processes of the coal slime in the hearth are influenced. Therefore, the research on the coal slime feeding form is very important.
The feeding form of the coal slime in different feeding modes mainly depends on the stress state of the coal slime. Coal slurry is a highly viscous non-newtonian fluid composed of minerals and water and has physical composition similar to clay. Therefore, the research on the stress state of the coal slime mainly refers to the related research method of the clay. The main method for measuring the stress condition of the clay at present is a uniaxial tension method, and a tension test is carried out by preparing a sample of the clay. However, the water content and the caking property of the coal slurry are higher than those of the clay, and the coal slurry shows the property of non-Newtonian fluid under the normal condition, so that the coal slurry cannot be molded and prepared by using the preparation method of the clay sample. For example, the coal slurry sample is prepared by adopting a common preparation method of a clay sample, namely a layered compaction method, the prepared coal slurry sample is easy to crack from the joint surfaces of all layers, and the real stress value of the coal slurry cannot be measured.
Disclosure of Invention
The invention provides a preparation method of a coal slime stress measurement sample for a fluidized bed, aiming at solving the problem that the existing method for preparing the sample by using clay is not suitable for preparing the coal slime sample.
The technical scheme of the invention is as follows:
a preparation method of a coal slime stress measurement sample for a fluidized bed comprises the following steps:
A. the sample mold comprises a container with an opening, and the coal slime to be detected is placed into the container;
B. placing a movable gland in said opening of said container;
C. applying pressure to the coal slime to be detected through the movable gland by adopting a lever mechanism; the gravity of the counterweight is used as the power of the lever mechanism;
D. increase gradually the weight of counter weight, work as the activity gland stops the compression correspond when the coal slime that awaits measuring the weight of counter weight does the compactness of the coal slime that awaits measuring corresponds when 100% the first weight of counter weight.
Optionally, the preparation method of the coal slurry stress measurement sample for the fluidized bed further comprises the following steps:
E. and in order to prepare the sample with the compactness of a of the coal slime to be detected, the second weight of the required weight is the product of the first weight and the weight a.
Optionally, the length-diameter ratio of the coal slurry sample to be detected prepared by the preparation method is 2.5.
Optionally, in step a, an anti-cracking reinforcing frame is arranged in the container along at least one end of the container in the length direction.
Optionally, the shape of the anti-cracking reinforcing frame comprises a tree shape; the tree form includes a trunk and branches connected to the trunk.
Optionally, the tree comprises secondary branches connected to the branches.
Optionally, one end of the stem is disposed at a bottom of the container opposite the movable gland.
Optionally, if the length of the coal slurry sample to be detected prepared by the preparation method is b, the length of the anti-cracking reinforcing frame is less than or equal to 0.25 b.
Optionally, the power arm of the lever mechanism is larger than the resistance arm.
Optionally, after the step a, the following steps are further included: and placing the container in a sealed waterproof cavity for a preset time.
Optionally, when the water content of the coal slime to be detected is more than 25%, the container is cylindrical; and when the water content of the coal slime to be detected is less than or equal to 25%, the container is dumbbell-shaped.
The invention has the technical effects that:
firstly, by adopting the preparation method of the coal slime stress measurement sample, the coal slime is added once, so that the layer-to-layer fracture formed by a layered adding method is avoided, and the final test result of the sample can reflect the real stress value of the coal slime. Secondly, adopt lever mechanism suppression coal slime, the power of applying is regarded as to the counter weight for the power of applying can accurate measurement, and whether the coal slime continues to shrink because of pressure and can accurately observe through the displacement of lever. Thirdly, the method for obtaining the sample with the compaction degree of 100% is simple, convenient and feasible, and lays a foundation for obtaining other samples with the compaction degrees subsequently.
Further effects of the above alternatives will be described below in conjunction with the detailed description.
Drawings
FIG. 1 is a flow chart of an embodiment of a method for preparing a coal slurry stress measurement sample for a fluidized bed according to the present invention.
FIG. 2 is a schematic diagram of an embodiment of a lever mechanism used in the manufacturing method of the present invention.
Fig. 3 is a schematic structural diagram of an embodiment of an anti-cracking reinforcing frame adopted in the preparation method of the invention.
The designations in the figures illustrate the following:
201. a fulcrum; 202. a movable gland; 203. a sample mold container; 204. a bottom; 205. a weight; 206. a lever; 207. a strut;
301. a trunk; 302. secondary branches; 303. and (4) branches.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the embodiments shown in the drawings.
FIG. 1 shows one embodiment of a method for preparing a sample of the present invention.
First, a manufacturing tool used in the manufacturing method of the present invention will be described with reference to fig. 2.
The preparation tool comprises a sample mold. The sample mould is used for containing the coal slime to be measured to finally make the coal slime to be measured form the instrument of sample with the help of pressure. The sample mold includes a sample mold receptacle 203. In this embodiment, the sample mold container 203 is a container having an opening and an inner shape of a cylinder, and has a cylindrical structure with an opening as a whole. The cylindrical structure is formed by buckling two parts of structures separated along the axial direction. The axis of the cylinder is parallel to the direction of gravity (i.e., vertical up and down in fig. 1), and the opposite cylindrical bottom portion of the cylindrical bottom 204 is open. A circular movable gland 202 is arranged on the opening, and the movable gland 202 seals the opening to form the cylindrical space with the rest of the sample mold container 203. The radial dimension of the movable gland 202 matches the radial dimension of the cylinder (i.e., the diameter of the base 204). Here, matching means that the clearance between the movable gland 202 and the cylindrical side wall can satisfy the following two conditions at the same time: firstly, the movable gland 202 cannot touch the cylindrical side wall when the coal slime in the sample mold container 203 is extruded in the cylindrical inner part; secondly, when the movable gland 202 extrudes the coal slime in the sample mold container 203, the coal slime cannot leak from the gap between the movable gland 202 and the cylindrical side wall.
The preparation tool further comprises a lever mechanism. The lever mechanism includes a lever 206 having a rod shape. One end of the lever 206 is hinged on the fulcrum 201, and the other end is hung with a weight 205. In the middle of the lever 206, the lever 206 is hinged to one end of a strut 207. The other end of the supporting rod 207 is movably connected to the central part of the movable gland 202. As can be seen in fig. 2, the weight 205 acts as a power source for the lever mechanism; the force fed back to the lever 206 when the supporting rod 207 presses the movable gland 202 is the source of resistance of the lever mechanism; the power arm of the lever mechanism is larger than the resistance arm.
The concrete steps of the preparation method of the coal slurry stress measurement sample for the fluidized bed of the invention are explained below with reference to fig. 1.
First, after the two structures are fastened to form the sample mold container 203, the inner wall of the sample mold container 203 is cleaned with a brush. Then, the inner wall of the sample mold container 203 is coated with vaseline, so that the coal slime can be prevented from being bonded with the inner wall, and the moisture in the coal slime is prevented from being adsorbed by the material of the inner wall to further influence the water content of the coal slime.
Secondly, placing the coal slime into a sample mold.
The coal slurry to be measured is placed into the sample mold container 203 from the opening, and the exposed coal slurry portion is laid flat and compacted. The open mouth of the sample mold container 203 is then sealed with a plastic film and the sample mold container 203 is placed in a sealed plastic bag to prevent moisture loss. The sample mold container 203 enclosed in the plastic bag is left to stand for 12 to 24 hours to allow the water in the coal slurry to be uniformly distributed.
Third, the sample mold container 203 is assembled in place as shown in FIG. 2, with the movable gland 202 pressing against the exposed coal slurry portion from the opening.
Fourth, applying pressure to the coal slurry
This step is performed by suspending the weight 205, and applying pressure to the coal slurry through the lever 206, the rod 207, and the movable gland 202 by using the weight of the weight 205. The coal slurry is compressed when subjected to pressure, causing the movable gland 202 to move downward (downward in fig. 2), and correspondingly, the end of the lever 206 where the weight 205 is located. Due to the characteristics of the lever, the distance moved by the weight 205 is greater than the distance moved by the movable cover 202 downwards, which is more convenient for observation and measurement when the distance moved by the movable cover 202 downwards is smaller.
Fifthly, adding weights
The pressure applied to the coal slurry should be gradually increased, i.e., the weight 205 should be gradually increased (i.e., the weight of the counterweight should be increased in series). This is to avoid when increasing the weight the second time, and the coal slime no longer compresses, can't confirm at this moment whether the weight of applying for the first time is overweight. Therefore, the weight of the first added weight is smaller than the estimated weight, and the weight of the subsequent added weight should be gradually reduced to ensure the accuracy of the final measurement.
Sixthly, whether the coal slime is compressed or not
And if the coal slime is still compressed, repeating the previous step to add the weights. Of course, the weight of the added weight should be reduced from the last time.
Seventhly, obtaining a coal slime sample with the compaction degree of 100%
When the movable gland 202 does not move downwards any more, the compactness of the coal slime to be measured at the moment is considered to be 100%, and the weight of the corresponding weight 205 at the moment is recorded. For ease of subsequent reference, this weight is designated herein as the first weight. When the weight is added, the movable gland 202 does not move downwards any more (can be kept still for 2 hours for observation and confirmation), and the weight of all the weights before the weight is added is the first weight.
Thus, the first weight corresponding to the coal slime with the specific water content and the to-be-detected compactness of 100% is obtained. The first weight can be converted into a required pressure, etc. according to a mechanical formula of the lever, which is not described herein again.
When the samples with other compactibility of the coal slime with the specific water content need to be prepared, assuming that the compactibility is a, the corresponding weight (second weight) is the product of the first weight and a.
In the testing process of the prepared coal slime sample, two ends of the sample are required to be adhered to a testing device, and then tensile force is applied to the two ends until the sample is broken from the middle part, so that stress measurement is carried out. During testing, it is often the case that a fracture occurs adjacent to the end of the specimen. A fracture occurs adjacent the end of the specimen and the test is generally considered inaccurate and fails. Ideally, the fracture should occur in the middle of the specimen.
In order to avoid the above test failure, the preparation of the coal slurry sample is improved, and a further improvement scheme will be described.
And aiming at coal slime with different water contents, the prepared samples are different in shape. Specifically, when the water content of the coal slurry is more than 25%, the shape of the sample is cylindrical. The corresponding sample mold container 203 shown in fig. 2 is cylindrical in internal shape. When the water content of the coal slime is less than or equal to 25%, the sample is dumbbell-shaped, and two end parts of the dumbbell-shaped sample are convenient for the test device to clamp. The corresponding sample mold container 203 shown in fig. 2 has a dumbbell shape in its interior. Through experimental verification, the scheme is favorable for avoiding the occurrence of the test failure condition.
Also for the purpose of the above test failure, the preparation of the coal slurry samples was further modified, as will be described below.
The improved scheme is that the ratio of the long diameter to the diameter of the coal slurry sample is set to be 2.5, and in this case, the test failure can be further avoided. Namely, the ratio of the axial length of the cylinder to the diameter of the bottom of the cylindrical sample is 2.5; the ratio of the axial length to the radial dimension of the waist portion (excluding the enlarged portions at both ends) of the dumbbell specimen was 2.5. The following table is the results of comparative tests on aspect ratios for cylindrical and dumbbell specimens, respectively.
Watch 1
| Ratio of | Fracture site of specimen | Whether it is qualified or not |
| 2 | Diameter-variable part at right end | Fail to be qualified |
| 2.25 | 10mm from the right end | Fail to be qualified |
| 2.5 | At the middle position | Qualified |
| 2.75 | 15mm at the right end | Fail to be qualified |
In order to avoid the situation that the end part adjacent to the sample is broken, the invention further adopts the measure that an anti-cracking reinforcing frame is arranged at least one end part of the sample. The anti-cracking reinforcing frame is made of a material with considerable strength, such as steel material used in the embodiment shown in fig. 3. Therefore, the anti-cracking reinforcing frame can not deform when being subjected to tensile force during testing, otherwise, the deformation can reduce the strength of the end part of the sample, and further, the accident of breakage of the end part of the adjacent sample is caused.
Fig. 3 shows an example of an anti-cracking reinforcing frame employed in the present invention. Fig. 3 shows a tree-shaped anti-cracking reinforcing frame, namely, the shape of the anti-cracking reinforcing frame is similar to that of a tree. Fig. 3 is a plan view of the crack prevention reinforcement cage shown from an angle, and actually, the tree-shaped crack prevention reinforcement cage is a three-dimensional structure extending in a three-dimensional space. Similar to the structure of a tree, the crack prevention reinforcement frame shown in fig. 3 includes a trunk 301 and branches 303 connected to the trunk 301. One end of the branch 303 is connected to the trunk 301, and the other end is connected to the middle of the secondary branch 302. The main trunk 301, the branch 303 and the secondary branch 302 of the tree-shaped anti-cracking strengthening frame correspond to the main trunk, branches and leaves of the tree. When the preparation method of the coal slurry stress measurement sample for the fluidized bed shown in fig. 1 is adopted, before the coal slurry is placed in the sample, the anti-cracking reinforcing frame shown in fig. 3 can be arranged at the bottom 204 (refer to fig. 2), specifically, the lower end part of the trunk 301 in fig. 3 is placed on the bottom 204, so that in fig. 2, the anti-cracking reinforcing frame is erected on the bottom 204 in the form shown in fig. 3, and then the coal slurry is placed in the sample. In order to ensure that the anti-cracking reinforcing frame is toppled over due to impact or subsequent pressing of the coal slurry when the coal slurry is put into the coal slurry, the anti-cracking reinforcing frame (namely, the end part of the trunk 301) can be fixed on the bottom part 204 in a cementing mode and the like. In this embodiment, the anti-cracking reinforcing frame is fixed on the bottom 204 by welding. After the sample is prepared, the anti-cracking reinforcing frame is buried in the sample, and the bottom 204 and the trunk 301 can be cut away in a cutting mode. At this time, a partial region of the crack prevention reinforcing frame (i.e., an end portion of the trunk 301) is exposed at a tip end of the sample, and the tip end is bonded to the test apparatus. When testing arrangement applyed the tensile force, the power of applying to the tip of trunk 301 can be decomposed to each contact part of crack control reinforcement frame and sample inside, avoids the tensile force to concentrate on the top of sample, more does benefit to and avoids the top fracture at the sample. The radial dimension of the anti-cracking reinforcing frame is certainly smaller than the minimum radial dimension of the sample part where the anti-cracking reinforcing frame is located; the axial dimension of the crack control reinforcement cage should be no more than one quarter of the entire specimen length. Namely, if the length of the prepared coal slime sample to be detected is b, the length of the anti-cracking reinforcing frame is less than or equal to 0.25 b.
The coal slime sample prepared by the method can be used for effectively testing various stresses, such as tensile stress, shear stress and the like of the sample.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and do not limit the scope of the present invention, and the present invention may be replaced by other equivalent techniques. Therefore, all equivalent changes, direct or indirect applications, made by using the description and the drawings of the present invention, or other related technical fields are included in the scope of the present invention.
Claims (11)
1. A preparation method of a coal slime stress measurement sample for a fluidized bed is characterized by comprising the following steps: the method comprises the following steps:
A. the sample mold comprises a container with an opening, and the coal slime to be detected is placed into the container;
B. placing a movable gland in said opening of said container;
C. applying pressure to the coal slime to be detected through the movable gland by adopting a lever mechanism; the gravity of the counterweight is used as the power of the lever mechanism;
D. increase gradually the weight of counter weight, work as the activity gland stops the compression correspond when the coal slime that awaits measuring the weight of counter weight does the compactness of the coal slime that awaits measuring corresponds when 100% the first weight of counter weight.
2. The preparation method of the coal slime stress measurement sample for the fluidized bed according to claim 1, characterized by comprising the following steps: also comprises the following steps:
E. and in order to prepare the sample with the compactness of a of the coal slime to be detected, the second weight of the required weight is the product of the first weight and the weight a.
3. The preparation method of the coal slime stress measurement sample for the fluidized bed according to claim 1, characterized by comprising the following steps: the length-diameter ratio of the coal slime sample to be detected prepared by the preparation method is 2.5.
4. The preparation method of the coal slime stress measurement sample for the fluidized bed according to claim 1, characterized by comprising the following steps: in step a, an anti-cracking reinforcing frame is provided in at least one end portion of the container in the length direction thereof.
5. The preparation method of the coal slime stress measurement sample for the fluidized bed according to claim 4, characterized by comprising the following steps: the shape of the anti-cracking reinforcing frame comprises a tree shape; the tree form includes a trunk and branches connected to the trunk.
6. The preparation method of the coal slime stress measurement sample for the fluidized bed according to claim 5, characterized by comprising the following steps: the tree form includes secondary branches connected to the branches.
7. The preparation method of the coal slime stress measurement sample for the fluidized bed according to claim 5, characterized by comprising the following steps: one end of the trunk is arranged at the bottom of the container opposite to the movable gland.
8. The preparation method of the coal slime stress measurement sample for the fluidized bed according to claim 4, characterized by comprising the following steps: and if the length of the coal slime sample to be detected prepared by the preparation method is b, the length of the anti-cracking reinforcing frame is less than or equal to 0.25 b.
9. The preparation method of the coal slime stress measurement sample for the fluidized bed according to claim 1, characterized by comprising the following steps: and a power arm of the lever mechanism is larger than a resistance arm.
10. The preparation method of the coal slime stress measurement sample for the fluidized bed according to claim 1, characterized by comprising the following steps: after the step A, the method also comprises the following steps: and placing the container in a sealed waterproof cavity for a preset time.
11. The preparation method of the coal slime stress measurement sample for the fluidized bed according to claim 1, characterized by comprising the following steps: when the water content of the coal slime to be detected is more than 25%, the container is cylindrical; and when the water content of the coal slime to be detected is less than or equal to 25%, the container is dumbbell-shaped.
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