CN112362579A - Testing device for metal surface adhesion force in presence of surface electroosmosis - Google Patents
Testing device for metal surface adhesion force in presence of surface electroosmosis Download PDFInfo
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- CN112362579A CN112362579A CN202011268204.5A CN202011268204A CN112362579A CN 112362579 A CN112362579 A CN 112362579A CN 202011268204 A CN202011268204 A CN 202011268204A CN 112362579 A CN112362579 A CN 112362579A
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- electroosmosis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
Abstract
The invention provides a testing device for metal surface adhesion force in the presence of surface electroosmosis, which comprises: a base, one end of which is provided with a pulley; the bottom plate is arranged on the base, and the surface of the bottom plate is provided with a groove; the electrode plate is placed in the groove; the cylinder is placed on the electrode plate, the metal pressing block and the material cake are sequentially arranged in the cylinder from top to bottom, and the surface of the cylinder is carved with a shallow groove; and the tray is connected to one end of a thin wire which is led out from the shallow groove and passes through the pulley, and is used for placing weights, wherein the electrode plate is connected with the pulse power supply through a power line. The invention has simple structure and convenient use, can improve the viscous characteristic and improve the operation efficiency of equipment, and has important significance for realizing more efficient industrial treatment.
Description
Technical Field
The invention belongs to the technical field of viscous material desorption testing, and particularly relates to a testing device for metal surface adhesion force in the presence of surface electroosmosis.
Background
The problem of adhesion of viscous materials to surfaces of materials with which they come into contact is widespread in industrial processes. Sludge is taken as a typical high-viscosity material in the municipal sewage treatment process, and the resource utilization of the sludge is increasingly paid attention. The dehydration and drying treatment of the wet sludge are important means for realizing sludge reduction and sludge resource utilization. Sludge dewatering and drying are indispensable treatment processes for landfill, incineration, heat energy and agricultural utilization.
In this process, stiction is one of the major problems faced. Experiments and researches show that in the process of continuously reducing the water content of the sludge, the physical and chemical properties of the sludge are continuously changed, when the water content is reduced to 40-60%, the adhesiveness and caking property of the sludge are obvious, and the stage is generally called as a viscous zone. The viscous property brings many hazards, such as increased heat transfer resistance, reduced drying rate, more frequent cleaning of the equipment, increased cleaning workload, increased cleaning difficulty, potential safety hazard, and the like. Therefore, the improvement of the viscous characteristic has important significance for improving the operation efficiency of equipment and realizing more efficient industrial treatment.
At present, related researches on the problem of adhesion between soil and a metal wall surface when a forklift is used for shoveling soil by adopting a surface electroosmosis method are carried out, and certain achievements are obtained on solving the problem of the adhesion of the soil. In addition, the research on the electroosmosis pulse technology for resisting seepage and preventing moisture of a concrete structure also obtains good effects on removing moisture and reducing the internal humidity of the structure.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide a testing device for metal surface adhesion force during surface electroosmosis.
The invention provides a device for testing the adhesion force of a metal surface in the presence of surface electroosmosis, which is characterized by comprising: a base, one end of which is provided with a pulley; the bottom plate is arranged on the base, and the surface of the bottom plate is provided with a groove; the electrode plate is placed in the groove; the cylinder is placed on the electrode plate, the metal pressing block and the material cake are sequentially arranged in the cylinder from top to bottom, and the surface of the cylinder is carved with a shallow groove; and the tray is connected to one end of a thin wire which is led out from the shallow groove and passes through the pulley, and is used for placing weights, wherein the electrode plate is connected with the pulse power supply through a power line.
The testing device for the metal surface adhesion force in the presence of surface electroosmosis provided by the invention can also have the following characteristics: wherein, an organic glass cover is arranged on the bottom plate and used for covering the cylinder.
The testing device for the metal surface adhesion force in the presence of surface electroosmosis provided by the invention can also have the following characteristics: wherein, the base is a polytetrafluoroethylene flat plate.
The testing device for the metal surface adhesion force in the presence of surface electroosmosis provided by the invention can also have the following characteristics: wherein, the bottom plate is a stainless steel flat plate.
The testing device for the metal surface adhesion force in the presence of surface electroosmosis provided by the invention can also have the following characteristics: the electrode plate is strip-shaped stainless steel, the cross section of the electrode plate is rectangular, a threaded hole is formed in one side of the electrode plate, a power line is fixed in the threaded hole through a screw, the electrode plate comprises a positive electrode plate and a negative electrode plate, and the area ratio of the positive electrode plate to the negative electrode plate is 1: 1-1: 14.
Action and Effect of the invention
According to the testing device for the metal surface adhesion force during the surface electroosmosis, the grooves are formed in the surface of the bottom plate, so that the testing device can be used for placing the electrode plate; because the electrode plate is connected with the pulse power supply through the power line, the surface electroosmosis and the electroosmosis pulse are combined to generate a periodically-changed electric field, so that hydrated cations in the sample are promoted to migrate towards the surface direction of the equipment, and a layer of water film is formed on the surface in an enrichment manner to lubricate the contact surface, so that the viscous property between the material and the contact surface can be improved; since the tray is connected to one end of the thin wire which is drawn out from the shallow groove on the surface of the cylinder and passes through the pulley, when measuring the surface adhesion force, the adhesion force of the material on the metal surface when the surface electroosmosis exists can be calculated by recording the number of the weights which are put in at the moment when the cylinder is changed from a static state to a just sliding state.
In conclusion, the testing device for the metal surface adhesion force in the presence of surface electroosmosis has the advantages of simple structure, convenience in use, capability of improving the viscous characteristic and improving the operation efficiency of equipment, and has important significance for realizing more efficient industrial treatment.
Drawings
FIG. 1 is a schematic diagram of the structure of a test device for metal surface adhesion in the presence of surface electroosmosis in an embodiment of the invention;
FIG. 2(a) is a front view of a base in an embodiment of the invention;
FIG. 2(b) is a side view of a base in an embodiment of the invention;
FIG. 3(a) is a front view of a base plate in an embodiment of the invention;
FIG. 3(b) is a side view of a base plate in an embodiment of the invention;
FIG. 4(a) is a front view of a cylinder in an embodiment of the present invention;
FIG. 4(b) is a top view of a cylinder in an embodiment of the present invention;
FIG. 5(a) is a front view of a plexiglass cover in an embodiment of the invention;
fig. 5(b) is a side view of a plexiglass cover in an embodiment of the invention.
Detailed Description
In order to make the technical means and functions of the present invention easy to understand, the present invention is specifically described below with reference to the embodiments and the accompanying drawings.
Example (b):
FIG. 1 is a schematic diagram of the structure of a test device for metal surface adhesion in the presence of surface electroosmosis in an embodiment of the present invention.
As shown in fig. 1, the present embodiment provides a testing device 100 for metal surface adhesion in the presence of surface electroosmosis, comprising: base 1, bottom plate 2, electrode plate 3, drum 4, tray 5.
FIG. 2(a) is a front view of a base in an embodiment of the present invention, and FIG. 2(b) is a side view of the base in the embodiment of the present invention
As shown in fig. 1, 2(a) and 2(b), one end of the base 1 is provided with a pulley 6, and the base 1 is a teflon flat plate.
Fig. 3(a) is a front view of a base plate in an embodiment of the present invention, and fig. 3(b) is a side view of the base plate in the embodiment of the present invention.
As shown in fig. 1, 3(a) and 3(b), the bottom plate 2 is disposed on the base 1, and has a groove formed on the surface thereof, and the bottom plate 2 is a stainless steel flat plate.
The electrode plate 3 is placed in the groove, and the electrode plate 3 is connected with the pulse power supply 7 through a power line.
In this embodiment, the electrode plate 3 is strip-shaped stainless steel, has a rectangular cross section, is provided with a threaded hole on one side, and has a power line fixed therein by a screw, and includes a positive electrode plate and a negative electrode plate, and the area ratio of the positive electrode plate to the negative electrode plate is 1: 1-1: 14.
Fig. 4(a) is a front view of a cylinder in an embodiment of the present invention, and fig. 4(b) is a top view of the cylinder in the embodiment of the present invention.
As shown in fig. 1, 4(a) and 4(b), the cylinder 4 is placed on the electrode plate 3, and the inside of the cylinder is provided with a metal pressing block 8 and a material cake 9 in sequence from top to bottom, and the surface of the cylinder is carved with shallow grooves.
Fig. 5(a) is a front view of the plexiglass cover in an embodiment of the invention, fig. 5(b) is a side view of the plexiglass cover in an embodiment of the invention,
as shown in fig. 1, 5(a) and 5(b), a plexiglass cover 10 is provided on the bottom plate 2 for covering the cylinder 4.
The tray 5 is connected to one end of a thread 11 drawn out from a shallow groove and passed through a pulley 6, and is used for placing a weight.
By adopting the testing device 100 with metal surface adhesion force during surface electroosmosis of the embodiment, before the test is started, the electrode plate 3 is placed in the groove on the bottom plate 2, the number of the positive plates and the negative plates can be flexibly adjusted, and different positive-negative electrode area ratios are realized. Taking a certain mass of viscous material to be measured as a sample, putting the sample into the cylinder 4, and pressing the sample into a material cake 9 with the thickness of 2-3cm by using the metal pressing block 8. The cylinder 4 is engraved with shallow grooves as shown in fig. 4. The shallow groove is wound with a thin line 11, one end of which is fixed on the cylinder 4, and the other end is led out and connected with the tray 5 through a pulley 6. The pulse power supply 7 consists of a direct current power supply and a pulse generator, the voltage is 0-30V, and the frequency is 10-500 Hz. One side of the electrode plate 3 is provided with a threaded hole, a power line is fixed in the threaded hole by a screw, and the other end of the electrode plate is connected to the pulse power supply 7, so that the pulse power supply 7 can realize the surface electroosmosis effect under different parameters by changing the frequency and voltage of signals.
At the start of the test, the pulse power supply 7 is switched on and weights are added to the tray 5 after a while. Since the adhesion of the material is manifested as a shear stress on the metal surface, the cylinder 4 remains stationary as soon as the weight is added. The weight addition was continued until the cylinder 4 changed from the rest state to the just-sliding state, and the total mass of the weight placed was recorded.
The adhesion stress of the material is calculated from the cross-sectional area of the cylinder 4 and the measured total weight of the weight according to the following formula:
in the formula, tau is the adhesion stress of the material on the metal surface and has the unit of Pa; ms is the total mass of the steel balls and the container, and the unit is kg; m0The unit is kg of blank sliding mass of the stainless steel pipe; g is the acceleration of gravity in m/s2(ii) a A is the area of the material cake in m2。
And (3) repeating the adhesion stress test for each material cake 9 for 3 times, averaging the adhesion stress values obtained by the 3 times of tests to obtain the adhesion stress of the material on the metal surface, and ending the test process.
Effects and effects of the embodiments
According to the testing device for the metal surface adhesion force during the surface electroosmosis, the grooves are formed in the surface of the bottom plate, so that the testing device can be used for placing the electrode plate; because the electrode plate is connected with the pulse power supply through the power line, the surface electroosmosis and the electroosmosis pulse are combined to generate a periodically-changed electric field, so that hydrated cations in the sample are promoted to migrate towards the surface direction of the equipment, and a layer of water film is formed on the surface in an enrichment manner to lubricate the contact surface, so that the viscous property between the material and the contact surface can be improved; since the tray is connected to one end of the thin wire which is drawn out from the shallow groove on the surface of the cylinder and passes through the pulley, when measuring the surface adhesion force, the adhesion force of the material on the metal surface when the surface electroosmosis exists can be calculated by recording the number of the weights which are put in at the moment when the cylinder is changed from a static state to a just sliding state.
According to the device for testing the metal surface adhesion force during the surface electroosmosis in the embodiment, the power supply line can be fixed in the threaded hole by the screw since the threaded hole is formed in one side of the electrode plate.
To sum up, the testing arrangement of metal surface adhesion when having surface electroosmosis of this embodiment, simple structure, convenient to use can improve the viscous characteristic, improves equipment operating efficiency, has important meaning to realizing more efficient industrial processing.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.
Claims (5)
1. A test device for testing adhesion of a metal surface in the presence of surface electroosmosis, comprising:
a base, one end of which is provided with a pulley;
the bottom plate is arranged on the base, and a groove is formed in the surface of the bottom plate;
the electrode plate is placed in the groove;
the cylinder is placed on the electrode plate, the metal pressing block and the material cake are sequentially arranged in the cylinder from top to bottom, and the surface of the cylinder is carved with a shallow groove; and
a tray connected to one end of a thin wire drawn out of the shallow groove and passing through the pulley for placing weights,
wherein, the electrode plate is connected with a pulse power supply through a power line.
2. The device for testing adhesion of a metal surface in the presence of surface electroosmosis of claim 1, wherein:
wherein, be provided with the organic glass cover on the bottom plate for cover the drum.
3. The device for testing adhesion of a metal surface in the presence of surface electroosmosis of claim 1, wherein:
wherein, the base is a polytetrafluoroethylene flat plate.
4. The device for testing adhesion of a metal surface in the presence of surface electroosmosis of claim 1, wherein:
wherein, the bottom plate is a stainless steel flat plate.
5. The device for testing adhesion of a metal surface in the presence of surface electroosmosis of claim 1, wherein:
wherein the electrode plate is strip-shaped stainless steel, the cross section of the electrode plate is rectangular, a threaded hole is formed in one side of the electrode plate, the power line is fixed in the threaded hole through a screw,
the positive plate and the negative plate are arranged in a ratio of 1: 1-1: 14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011268204.5A CN112362579A (en) | 2020-11-13 | 2020-11-13 | Testing device for metal surface adhesion force in presence of surface electroosmosis |
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| CN202011268204.5A CN112362579A (en) | 2020-11-13 | 2020-11-13 | Testing device for metal surface adhesion force in presence of surface electroosmosis |
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| CN112362579A true CN112362579A (en) | 2021-02-12 |
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| CN202011268204.5A Pending CN112362579A (en) | 2020-11-13 | 2020-11-13 | Testing device for metal surface adhesion force in presence of surface electroosmosis |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115387414A (en) * | 2022-09-21 | 2022-11-25 | 江苏徐工工程机械研究院有限公司 | Bucket and excavator |
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Patent Citations (7)
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| CN101464126A (en) * | 2009-01-09 | 2009-06-24 | 清华大学 | Production method of integrated submissive sensor for measuring curve clearance and force |
| CN201965805U (en) * | 2011-03-04 | 2011-09-07 | 上海大学 | Teaching device of soil engineering single-shear test |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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