Rotary centrifugal adhesion coefficient measuring device and method

Abstract

The invention discloses a rotary centrifugal adhesion coefficient measuring device and method, and relates to the technical field of viscous substance physical property research, the rotary centrifugal adhesion coefficient measuring device comprises a driving structure and a disc, the power output end of the driving structure is in transmission connection with the disc, and the power output end of the driving structure is in transmission connection with the disc. The driving structure is used for driving the disc to rotate around the axis of the disc, a plurality of sample groove structures arranged around the center of the disc are arranged on the disc, each sample groove structure comprises a plurality of sample grooves formed in the radial direction of the disc, and to-be-detected samples are arranged in the sample grooves; scales are arranged on the surface of the disc in the radial direction of the disc and correspond to the sample grooves. The rotary centrifugal adhesion coefficient measuring device and the rotary centrifugal adhesion coefficient measuring method can be used for measuring the adhesion coefficient of a single or mixed low-adhesion substance such as Newtonian / non-Newtonian fluid.

Description

Technical Field

[0001] The invention relates to the technical field of physical property research of viscous substances, and in particular to a rotary centrifugal adhesion coefficient measuring device and method. Background Art

[0002] In the process of establishing the coking model of coal direct liquefaction reactor, the measurement of adhesion coefficient and adhesion force is a crucial step. However, the existing measurement equipment is often unable to accurately measure the adhesion coefficient, which brings certain difficulties to research and engineering practice. Therefore, it is necessary to design a new device to measure the adhesion coefficient to meet the needs of establishing the coking model of coal direct liquefaction reactor. Summary of the invention

[0003] The object of the present invention is to provide a rotary centrifugal adhesion coefficient measuring device and method, which can measure the adhesion coefficient of a single or mixed low-adhesion material such as a Newtonian / non-Newtonian fluid.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a rotary centrifugal adhesion coefficient measuring device, comprising: a driving structure and a disc, wherein a power output end of the driving structure is drivingly connected to the disc, the driving structure is used to drive the disc to rotate around the axis of the disc, a plurality of sample slot structures arranged around the center of the disc are arranged on the disc, each of the sample slot structures comprises a plurality of sample slots arranged along the radial direction of the disc, a sample to be detected is arranged in the sample slot, and a scale is arranged on the surface of the disc along the radial direction of the disc, and the scale corresponds to the sample slot.

[0006] Preferably, the sample slot is used to place a sample piece, the sample piece is used to carry the sample to be detected, and the sample piece is connected to the sample slot via a magnetic attraction structure.

[0007] Preferably, it further comprises an anti-eccentricity structure, and the disc and the driving structure are connected via the anti-eccentricity structure.

[0008] Preferably, the anti-eccentricity structure comprises an anti-eccentricity body, a plurality of protrusions are arranged on the upper end of the anti-eccentricity body, and the disc is provided with grooves matching the protrusions.

[0009] Preferably, a first connecting hole is provided at the center of the disk, and a first fastener passes through the first connecting hole and is connected to the anti-eccentricity body.

[0010] Preferably, a first through hole is provided at the center of the disc, a positioning groove is provided on the anti-eccentricity body at a position corresponding to the through hole, and a positioning pin passes through the through hole and extends into the positioning groove; a second connecting hole is provided on the disc, and a second fastener passes through the second connecting hole and is connected to the anti-eccentricity body.

[0011] Preferably, the anti-eccentricity structure comprises an anti-eccentricity body, the anti-eccentricity body is provided with a plum blossom-shaped protrusion, and the disc is provided with a plum blossom-shaped groove matching the plum blossom-shaped protrusion.

[0012] Preferably, the anti-eccentricity body is provided with a plurality of threaded structures, the disc is provided with a second through hole matching the threaded structure, each of the threaded structures passes through the second through hole on the disc and is fastened by a nut.

[0013] Preferably, the anti-eccentricity structure includes a first anti-eccentricity rotating shaft, a second anti-eccentricity rotating shaft and a rotating shaft, the first anti-eccentricity rotating shaft, the second anti-eccentricity rotating shaft and the disc are all sleeved on the rotating shaft, the inner wall of the first anti-eccentricity rotating shaft and the inner wall of the second anti-eccentricity rotating shaft are both threadedly connected to the rotating shaft, the outer wall of the first anti-eccentricity rotating shaft and the outer wall of the second anti-eccentricity rotating shaft are both threadedly connected to the side wall of the threaded hole in the center of the disc, the first anti-eccentricity rotating shaft and the second anti-eccentricity rotating shaft are connected by bolts, and a limiting protrusion for limiting the second anti-eccentricity rotating shaft is provided on the rotating shaft.

[0014] The present invention provides a method using the rotary centrifugal adhesion coefficient measuring device, comprising:

[0015] Select a sample piece made of the same contact material as the environment where the sample to be tested is located, install the sample piece in the sample slot, evenly distribute the sample to be tested on the sample piece, and record the initial area of ​​the sample to be tested. The driving structure drives the disc to rotate, and the area of ​​the sample to be tested after rotation deviation is photographed. By comparing the ratio of the area after rotation deviation to the initial area, it is determined whether a deviation occurs. If it is determined that a deviation occurs, the adhesion force F is calculated by the following formula 粘附力 , unit is N / m 2 ,

[0016] F 粘附力 =4π2mn2r / S,

[0017] The unit area adhesion coefficient Sc is calculated by the following formula:

[0018] Sc=F 粘附力 / F 重力 =4π2n2r / Sg

[0019] Where m is the mass of the sample to be tested, in kg; n is the speed of the driving structure, in 1 / s; r is the distance from the sample to be tested to the center of the disk, in m; S is the initial area of ​​the sample to be tested, in m 2 .

[0020] Compared with the prior art, the present invention has achieved the following technical effects:

[0021] The rotary centrifugal adhesion coefficient measuring device of the present invention can measure the adhesion coefficient of single or mixed low-adhesion materials such as Newtonian / non-Newtonian fluids through the principle of balance between centrifugal force and adhesion force. It has high sensitivity, high accuracy and is suitable for low-pressure conditions. It can ensure that reliable adhesion coefficient data is obtained during the establishment of the coking model of the coal direct liquefaction reactor, can analyze the relationship between friction and adhesion, support the research on the adhesion, deposition mechanism, mechanism and law of viscous fluids, and can provide more reliable technical support for the optimal design and production practice of coal direct liquefaction reactors, thereby promoting the development and application of coal direct liquefaction technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the rotary centrifugal adhesion coefficient measuring device of the present invention;

[0024] Figure 2 It is a schematic diagram of the connection between the anti-eccentricity structure and the disc of the present invention;

[0025] Figure 3 It is an exploded diagram of the anti-eccentricity structure and the disc of the present invention;

[0026] Figure 4 It is a schematic diagram of the connection between the anti-eccentricity structure and the disc of the present invention;

[0027] Figure 5 It is an exploded diagram of the anti-eccentricity structure and the disc of the present invention;

[0028] Figure 6 A top view of the anti-eccentricity body of the present invention;

[0029] Figure 7 It is a schematic diagram of the connection between the anti-eccentricity structure and the disc of the present invention;

[0030] Figure 8 It is an exploded diagram of the anti-eccentricity structure and the disc of the present invention;

[0031] In the figure: 1-disc, 2-sample slot, 3-anti-eccentricity structure, 4-first fastener, 5-driving structure, 6-speed control module, 7-anti-eccentricity body, 8-protrusion, 9-groove, 10-second connecting hole, 11-second fastener, 12-first through hole, 13-locating pin, 14-nut, 15-plum blossom-shaped protrusion, 16-threaded structure, 17-limiting protrusion, 18-first anti-eccentricity rotating shaft, 19-second anti-eccentricity rotating shaft, 20-rotating shaft. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] The object of the present invention is to provide a rotary centrifugal adhesion coefficient measuring device and method, which can measure the adhesion coefficient of a single or mixed low-adhesion material such as a Newtonian / non-Newtonian fluid.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Embodiment 1

[0036] like Figures 1 to 8 As shown, this embodiment provides a rotary centrifugal adhesion coefficient measuring device, including: a driving structure 5, a disk 1, a speed control module 6 and an adhesion coefficient calculation module, the power output end of the driving structure 5 is connected to the disk 1 in a transmission manner, the driving structure 5 is used to drive the disk 1 to rotate around the axis of the disk 1, the speed control module 6 is used to control the speed of the driving structure 5, a plurality of sample slots 2 structures are arranged uniformly around the center of the disk 1 on the disk 1, each sample slot 2 structure includes a plurality of sample slots 2 uniformly arranged along the radial direction of the disk 1, the sample slots 2 on the same circumference are spaced at least 60° apart, the innermost sample slot 2 is at least 5 cm away from the center of the disk 1, the sample slot 2 is used to arrange a sample to be detected, the surface of the disk 1 is provided with equidistant scales along the radial direction of the disk 1, the scales correspond to the sample slots 2 one by one, the scales are used to read the straight-line distance between the sample slot 2 and the center of the disk 1, the graduation value of the scale is at least 1 mm and can accurately record the area change of the sample to be detected, and the adhesion coefficient calculation module is used to calculate the adhesion coefficient of the sample to be detected.

[0037] Specifically, in this embodiment, the radius of the disk 1 is 15 cm and the thickness is 1 cm; the length, width and depth of the sample slot 2 are 2 cm, 2 cm and 0.5 cm; the sample slot 2 can also be circular or rectangular. The disk 1 is made of a material with moderate density, such as an acrylic plate or a stainless steel plate, and its mass needs to be evenly distributed to ensure that the disk 1 rotates stably, the measurement range is effective, and the measurement error caused by the unstable rotation eccentricity is avoided.

[0038] In this embodiment, the sample slot 2 is used to place the sample piece. The sample piece can be made of the same material as the material that actually contacts the sample to be tested. The sample piece needs to be flat, have uniform roughness, and be consistent in size and quality to avoid one side being too heavy and affecting the measurement result. The sample piece is used to carry the sample to be tested. The sample piece is connected to the sample slot 2 through a magnetic attraction structure to prevent the sample piece from flying off the disc 1 during high-speed rotation.

[0039] In this embodiment, the driving structure 5 is preferably a servo motor. The speed of the servo motor is selected in a suitable speed range according to the adhesion measurement range, the minimum resolution is at least 1rpm, the speed deviation is within 1rpm during stable operation, and the speed is accurately adjusted by the voltage phase.

[0040] This embodiment also includes an anti-eccentricity structure 3, through which the disc 1 and the driving structure 5 are connected. The anti-eccentricity structure 3 enables the disc 1 and the power output end of the driving structure 5 to cooperate well, ensuring that the disc 1 rotates smoothly and without eccentricity. The anti-eccentricity structure 3 has the following forms: the first type, such as Figure 1 and Figure 2 As shown, the anti-eccentricity structure 3 includes an anti-eccentricity body 7, the diameter of the anti-eccentricity body 7 is not less than 5 cm, a plurality of protrusions 8 are arranged on the upper end of the anti-eccentricity body 7, the disc 1 is provided with a groove 9 matching the protrusion 8, a first connecting hole is arranged at the center of the disc 1, a first fastener 4 passes through the first connecting hole and is connected to the anti-eccentricity body 7, the height of the fastener is 8 cm and the diameter is 6 cm, the lower end of the anti-eccentricity body 7 is used to be connected to the power output end of the driving structure 5, the thickness of the connecting structure between the anti-eccentricity body 7 and the power output end of the driving structure 5 is not less than 3 cm, and the connecting structure adopts high carbon steel or alloy steel to increase the strength; the second type, such as Figure 3 and Figure 4 As shown, the anti-eccentricity structure 3 includes an anti-eccentricity body 7, a plurality of protrusions 8 are arranged on the upper end of the anti-eccentricity body 7, preferably 3 to 8 protrusions 8, a disc 1 is provided with a groove 9 matching the protrusion 8, a gap between the protrusion 8 and the groove 9 does not exceed 0.1 mm, a first through hole 12 is arranged at the center of the disc 1, a positioning groove is arranged on the anti-eccentricity body 7 at a position corresponding to the through hole, a positioning pin 13 passes through the through hole and extends into the positioning groove; a second connecting hole 10 is opened on the disc 1, a second fastener 11 passes through the second connecting hole 10 and is connected to the anti-eccentricity body 7; a third type, such as Figure 5 and Figure 6 As shown, in this embodiment, the anti-eccentricity structure 3 includes an anti-eccentricity body 7, a plum blossom-shaped protrusion 15 is provided on the anti-eccentricity body 7, the height of the plum blossom-shaped protrusion 15 is not less than 10mm, and the disc 1 is provided with a plum blossom-shaped groove matching the plum blossom-shaped protrusion 15, and the gap between the plum blossom-shaped protrusion 15 and the plum blossom-shaped groove does not exceed 0.1mm, so as to achieve a close fit between the anti-eccentricity structure 3 and the disc 1; a plurality of threaded structures 16 are provided on the anti-eccentricity body 7, and the disc 1 is provided with a second through hole matching the threaded structure 16, and each threaded structure 16 passes through the second through hole on the disc 1 and is fastened by the nut 14; the fourth type, such as Figure 7 and Figure 8 As shown, in this embodiment, the anti-eccentricity structure 3 includes a first anti-eccentricity rotating shaft 18, a second anti-eccentricity rotating shaft 19 and a rotating shaft 20, the first anti-eccentricity rotating shaft 18, the second anti-eccentricity rotating shaft 19 and the disc 1 are all sleeved on the rotating shaft 20, the inner wall of the first anti-eccentricity rotating shaft 18 and the inner wall of the second anti-eccentricity rotating shaft 19 are both threadedly connected to the rotating shaft 20, the outer wall of the first anti-eccentricity rotating shaft 18 and the outer wall of the second anti-eccentricity rotating shaft 19 are both threadedly connected to the side wall of the threaded hole in the center of the disc 1, and the first anti-eccentricity rotating shaft 18 and the second anti-eccentricity rotating shaft 19 are connected by bolts, and the rotating shaft 20 is provided with a limiting protrusion 17 for limiting the second anti-eccentricity rotating shaft 19.

[0041] The rotary centrifugal adhesion coefficient measuring device of this embodiment can measure the adhesion coefficient of single or mixed low-adhesion materials such as Newtonian / non-Newtonian fluids through the principle of balance between centrifugal force and adhesion force, and can analyze the relationship between friction and adhesion force, and solve the problem that traditional pulling and scratch adhesion measurement methods cannot measure adhesion below 50psi (0.4MPa) and cannot distinguish the influence of friction force. It can accurately measure the adhesion coefficient with an error within 2%, and effectively support the research on the adhesion, deposition mechanism, mechanism and law of viscous fluids.

[0042] Embodiment 2

[0043] This embodiment provides an adhesion coefficient measurement method using the rotary centrifugal adhesion coefficient measurement device of embodiment 1, comprising:

[0044] A sample piece made of the same contact material as the environment where the sample to be tested is selected, and the sample piece is installed in the sample slot 2. The sample to be tested is evenly distributed on the sample piece, and the initial area of ​​the sample to be tested is photographed and recorded. The driving structure 5 drives the disc 1 to rotate, and the centrifugal force is adjusted by gradually adjusting the rotation speed. The adjustment amplitude is controlled within 3rpm each time. When the rotation speed deviation is within 1rpm, it is considered that the centrifugal force of the disc 1 has reached stability. The area of ​​the sample to be tested after rotation deviation is photographed, and the ratio of the area after rotation deviation to the initial area is compared to determine whether a deviation occurs. When the ratio of the area after rotation deviation to the initial area is between 1.2 and 2.0, it is determined that a deviation occurs, and the adhesion force F is calculated by the following formula 粘附力 , unit is N / m 2 ,

[0045] F 粘附力 =4π2mn2r / S,

[0046] The unit area adhesion coefficient Sc is calculated by the following formula:

[0047] Sc=F 粘附力 / F 重力 =4π2n2r / Sg

[0048] Where m is the mass of the sample to be tested, in kg; n is the speed of the driving structure, in 1 / s; r is the distance from the center of the sample to be tested to the center of the disk, in m; S is the initial area of ​​the sample to be tested, in m 2 .

[0049] This embodiment uses the principle of centrifugal force and adhesion force balance to accurately calculate the adhesion coefficient of low adhesion materials such as Newtonian / non-Newtonian fluids. The adhesion coefficient measurement method of this embodiment can measure the adhesion coefficient under adhesion forces below 50psi (0.4MPa) and different friction forces with an error within 2%.

[0050] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A rotary centrifugal adhesion coefficient measuring device, characterized in that: include: A driving structure and a disc, wherein a power output end of the driving structure is drivingly connected to the disc, and the driving structure is used to drive the disc to rotate around the axis of the disc. The disc is provided with a plurality of sample slot structures arranged around the center of the disc, and each of the sample slot structures includes a plurality of sample slots arranged along the radial direction of the disc, and the sample slots are used to arrange samples to be tested, and the surface of the disc is provided with scales along the radial direction of the disc, and the scales correspond to the sample slots.

2. The rotary centrifugal adhesion coefficient measuring device according to claim 1, characterized in that: The sample slot is used to place a sample piece, and the sample piece is used to carry the sample to be tested. The sample piece is connected to the sample slot via a magnetic attraction structure.

3. The rotary centrifugal adhesion coefficient measuring device according to claim 1, characterized in that: It also includes an anti-eccentricity structure, and the disc and the driving structure are connected via the anti-eccentricity structure.

4. The rotary centrifugal adhesion coefficient measuring device according to claim 3, characterized in that: The anti-eccentricity structure comprises an anti-eccentricity body, a plurality of protrusions are arranged on the upper end of the anti-eccentricity body, and the disc is provided with grooves matching the protrusions.

5. The rotary centrifugal adhesion coefficient measuring device according to claim 4, characterized in that: A first connecting hole is arranged at the center of the disk, and a first fastener passes through the first connecting hole and is connected to the anti-eccentricity body.

6. The rotary centrifugal adhesion coefficient measuring device according to claim 4, characterized in that: A first through hole is arranged at the center of the disc, a positioning groove is arranged on the anti-eccentricity body at a position corresponding to the through hole, a positioning pin passes through the through hole and extends into the positioning groove; a second connecting hole is opened on the disc, a second fastener passes through the second connecting hole and is connected to the anti-eccentricity body.

7. The rotary centrifugal adhesion coefficient measuring device according to claim 3, characterized in that: The anti-eccentricity structure comprises an anti-eccentricity body, the anti-eccentricity body is provided with a plum blossom-shaped protrusion, and the disc is provided with a plum blossom-shaped groove matching the plum blossom-shaped protrusion.

8. The rotary centrifugal adhesion coefficient measuring device according to claim 7, characterized in that: The anti-eccentricity body is provided with a plurality of thread structures, the disc is provided with a second through hole matching the thread structure, each of the thread structures passes through the second through hole on the disc and is fastened by a nut.

9. The rotary centrifugal adhesion coefficient measuring device according to claim 3, characterized in that: The anti-eccentricity structure includes a first anti-eccentricity rotating shaft, a second anti-eccentricity rotating shaft and a rotating shaft, the first anti-eccentricity rotating shaft, the second anti-eccentricity rotating shaft and the disc are all sleeved on the rotating shaft, the inner wall of the first anti-eccentricity rotating shaft and the inner wall of the second anti-eccentricity rotating shaft are both threadedly connected to the rotating shaft, the outer wall of the first anti-eccentricity rotating shaft and the outer wall of the second anti-eccentricity rotating shaft are both threadedly connected to the side wall of the threaded hole in the center of the disc, the first anti-eccentricity rotating shaft and the second anti-eccentricity rotating shaft are connected by bolts, and a limiting protrusion for limiting the second anti-eccentricity rotating shaft is provided on the rotating shaft.

10. A method using the rotary centrifugal adhesion coefficient measuring device according to any one of claims 1 to 9, characterized in that: include: Select a sample piece made of the same contact material as the environment where the sample to be tested is located, install the sample piece in the sample slot, evenly distribute the sample to be tested on the sample piece, and record the initial area of ​​the sample to be tested. The driving structure drives the disc to rotate, and the area of ​​the sample to be tested after rotation deviation is photographed. By comparing the ratio of the area after rotation deviation to the initial area, it is determined whether a deviation occurs. If it is determined that a deviation occurs, the adhesion force F is calculated by the following formula 粘附力 , unit is N / m 2 , F 粘附力 =4π2mn2r / S, The unit area adhesion coefficient Sc is calculated by the following formula: Sc=F 粘附力 / F 重力 =4π2n2r / Sg Wherein, m is the mass of the sample to be tested, in kg; n is the rotation speed of the driving structure, in 1 / s; r is the distance from the sample to be tested to the center of the disk, in m; S is the initial area of ​​the sample to be tested, in m 2 .

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