CN112067548A - Portable surface resistance coefficient testing arrangement - Google Patents
Portable surface resistance coefficient testing arrangement Download PDFInfo
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- CN112067548A CN112067548A CN202011018297.6A CN202011018297A CN112067548A CN 112067548 A CN112067548 A CN 112067548A CN 202011018297 A CN202011018297 A CN 202011018297A CN 112067548 A CN112067548 A CN 112067548A
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- torque
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- testing
- friction
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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
- G01N19/02—Measuring coefficient of friction between materials
Abstract
The invention discloses a portable surface resistance coefficient testing device.A power output shaft of a power driving device is connected with a torque testing device through a connecting device; the torque testing device is connected with the surface friction device through another connecting device and the main shaft. The pressure testing device is positioned in the device shell and is connected with the spring on the side edge in the surface friction device. The data processing display device is fixedly connected to the surface of the shell. The surface friction device comprises a spring, a replaceable friction surface and a three-grab coupling. The pressure testing device is a miniature pressure sensor and is positioned on one side of the spring of the surface friction device in the device shell, and the pressure applied by the spring can be measured. The invention can be carried about, and can quickly measure the surface resistance coefficient under the condition of not disassembling equipment. The invention adopts the replaceable testing head and has the characteristic of wide testing range. The method is simple to operate, and can display the test result in real time and rapidly.
Description
Technical Field
The invention relates to the field of surface resistance measurement, in particular to a portable surface resistance measuring device.
Background
The frictional resistance is seen everywhere in production and life, and is more than beneficial in most industrial processes. Taking the ship sailing transportation material as an example, due to the existence of frictional resistance, the ship body is forced to overcome a large amount of resistance to do work during sailing; this not only causes the speed of the ship to decrease, but also greatly increases energy consumption, causes unnecessary fuel consumption and produces more harmful gases. The friction resistance of equipment is deeply researched, an advanced resistance reduction technology is developed, the method has important significance for improving the working efficiency of the equipment and reducing environmental pollution, and the method is an important breakthrough for relieving energy crisis and environmental deterioration.
The first step of researching the frictional resistance is to effectively measure the resistance, and the main resistance testing methods at present mainly comprise a water tunnel, a wind tunnel, a water tank and the like. The test process of the wind tunnel and the water tunnel is complicated, the investment is large, and particularly, the sizes of power equipment and an air channel required by the wind tunnel test are relatively large. For the measurement of surface resistance, the traditional wind tunnel water tank is generally used for testing the surface resistance coefficient before the equipment is put into use, and after the equipment is put into use, if the resistance coefficient is required to be tested, the equipment needs to be disassembled and transported for measurement, so that the process is complex and the cost is extremely high. In order to balance the drag reduction efficiency and the replacement cost, the measuring instrument is required to accurately measure the resistance coefficient of the surface of the equipment before the equipment is used and can conveniently measure the resistance coefficient of the surface of the equipment without being disassembled after the equipment is put into use. Therefore, it is of great importance to develop a portable, low-cost and accurate testing device.
Disclosure of Invention
The invention provides a small resistance measuring instrument which occupies a small area, is simple to operate and is convenient to disassemble, aiming at the problems that the existing resistance measuring method needs large-scale equipment for support, the basic operation is complex, the control condition is severe and the like. The device has no requirement on the environment, is stable in load and low in noise, has the functions of measuring and displaying results, and can quantitatively measure the resistance of the surfaces of different structures.
The purpose of the invention is realized as follows:
the invention comprises a power driving device, a connecting device, a surface friction device, a pressure testing device, a torque testing device and a data processing and displaying device.
The power output shaft of the power driving device is connected with the torque testing device through a connecting device; the torque testing device is connected with the surface friction device through another connecting device and the main shaft. The pressure testing device is positioned in the device shell and is connected with the spring on the side edge in the surface friction device. The data processing and displaying device is fixedly connected to the surface of the shell.
The surface friction device comprises a spring, a replaceable friction surface and a three-grab coupling. The input end of the three-grab coupling is fixedly connected with the output end of the main shaft, and a sleeve is arranged between the three-grab coupling and the main shaft. The output end of the three-grabbing coupler is provided with a three-grabbing coupler end cover, and the three-grabbing coupler is fixed on the back of the friction surface. A gap is reserved between the three-grabbing coupler and the three-grabbing coupler end cover, and the transverse position of the three-grabbing coupler end cover can be changed within a certain range.
The pressure testing device is a miniature pressure sensor and is positioned on one side of the spring of the surface friction device in the device shell, and the pressure applied by the spring can be measured.
During testing, the power device drives the main shaft and the friction surface to rotate, the friction surface of the surface friction device is in contact with the tested surface and applies pressure to the surface, the torque testing device tests the torque, and the pressure testing device tests the surface pressure. And calculating to obtain the resistance according to the torque and the radius of the contact surface, and then obtaining the resistance coefficient according to the pressure.
Furthermore, the power device adopts a motor as a driving source, a power output shaft of the motor is inserted into the device shell and connected with the plum coupling, and the other end of the plum coupling is connected with the torque testing device. The power output is coincided with the central shaft of the torque testing device.
Furthermore, the torque testing device comprises a torque sensor and a supporting seat. The supporting seat is fixedly connected to the inner side of the device shell, and the torque sensor is fixedly connected to the supporting seat. And the two ends of the torque sensor are both connected with a plum coupling.
Furthermore, the main shaft is fixed through an arc-shaped shaft bracket.
Furthermore, the data processing and display device comprises a microprocessor and an LED display screen. The microprocessor receives data of the torque testing device and the pressure testing device and calculates a surface resistance coefficient, and the LED display screen is used for displaying a resistance testing result.
The invention has the beneficial effects that:
compared with the common resistance coefficient testing device at present, the invention has the characteristics of small volume and convenient carrying. The large-scale resistance coefficient testing device is fixed in position, and a testing device needs to be disassembled and transported to a testing place.
The invention adopts the replaceable testing head, has the characteristic of wide testing range, can measure both smooth surfaces and non-smooth surfaces, and can measure the surfaces of rigid bodies and elastic bodies.
The method is simple to operate, and can display the test result quickly in real time; low cost, small volume, safe operation, low noise and convenient maintenance.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a portable surface resistance coefficient testing device;
FIG. 2 is a schematic view of the internal structure of the surface friction device;
FIG. 3 is a cross-sectional view of an arc-shaped shaft support structure;
fig. 4 is a partially enlarged schematic view of a surface friction device pluggable structure.
Detailed Description
The following describes an embodiment of the present invention with reference to the drawings.
With reference to the accompanying drawings:
as shown in fig. 1, a portable resistance coefficient measuring device comprises a motor 1, a double clutch 3, a double clutch 11, a torque signal coupler 12, a main shaft 10, a surface friction device 9, and a data processing and display device 4. The power output end of the motor 1 is fixedly connected with the plum coupler 3, and the other end of the plum coupler 3 is fixedly connected with the input end of the torque signal coupler 12. The output end of the torque signal coupler 12 is fixedly connected with the plum blossom coupling 11, and the other end of the plum blossom coupling 11 is fixedly connected with the main shaft 10. The data processing and display device 4 is embedded into the device shell 5 and is fixedly connected with the device shell through screws.
The motor 1 is a power source of the whole device. Which is fixedly connected with the device housing by means of screws 2. The motor 1 is positioned outside the device shell, and the power output shaft of the motor is inserted into the shell 5. And a power shaft of the motor 1 is fixedly connected with the plum coupling 3. The device shell 5 is composed of four plates, wherein the four plates comprise two large plates and two small plates, the two large plate surfaces are arranged in parallel, the two small plate surfaces are also arranged in parallel and clamped between the two large plates to be fixed through screw connection, and the small plate surfaces are perpendicular to the large plate surfaces. The four plates are mutually spliced and fixed by screws to form a cuboid cavity for wrapping the internal structure of the resistance coefficient testing device.
And two ends of the torque signal coupler 12 are fixedly connected with the plum coupling 3 and the plum coupling 11 respectively. The torque signal coupler 12 is fixed inside the device housing by a raised block 13. The torque signal coupler has a torque testing function, when the input end drives the torque signal coupler shaft to rotate, if the output end does not apply resistance, the torque is 0, and if the output end receives resistance, the torque signal coupler can measure the torque.
Referring to fig. 1 and 2, the input end of the main shaft 10 is connected to the quincuncial coupler 11, and the output end of the main shaft 10 is connected to the three-claw coupler 22. In order to make the main shaft 10 stably run, the main shaft is supported by an arc-shaped shaft bracket 6. A bearing 7 is arranged between the main shaft 10 and the arc-shaped shaft bracket 6, and the position of the bearing is fixed by a sleeve 8.
The structure of the arc-shaped shaft support 6 is as shown in fig. 3, the arc-shaped shaft support 6 is fixed on the inner side of the shell 5 through a screw, the arc-shaped shaft support 6 is clamped in a groove of the shell 5 of the device, the arc-shaped shaft support 6 adopts a triangular structure, the material consumption is less, the support is firm, and the weight of the device is slightly influenced.
The internal structure of the surface friction device 9 is shown in fig. 2. Including a spring 15, a bearing 18, a replaceable friction surface 20, a triple grip coupling 22. The base portion of the surface friction device 9 is fixed by a screw 14, a screw 25, and the like. The input end of the three-grab coupling 22 is fixedly connected with the output end of the main shaft 10, and a sleeve 23 is arranged between the three-grab coupling 22 and the main shaft 10. The output end of the three-grabbing coupler 22 is provided with a three-grabbing coupler end cover 19, and the three-grabbing coupler 19 is fixed on the back of the friction surface through a screw. A gap is reserved between the three-grip coupler 22 and the three-grip coupler end cover 19, and the transverse position of the three-grip coupler end cover 19 can be changed within a certain range. The screw 16, the sleeve 17, the bearing 18, the replaceable friction surface 20, the three-grab coupling end cover 19 and the screw 21 form a testing head of the resistance coefficient testing device. The test head is of a pluggable structure, as shown in fig. 4, is not fixedly connected with the device, and can be replaced as required. The test head support portion is internally connected by a spring 15 which allows the test head to be compressed and displaced laterally. A pressure sensor 24 is pressed on the left side of the spring 15, said pressure sensor 24 being able to measure the change in spring force for indicating the pressure exerted by the alternative friction surface 20 on the surface to be measured.
The data processing and display device 4 is embedded into the shell, and a hole is formed in the lower portion of the shell to facilitate wiring. The data processing and display device can receive the data of the torque signal coupler 12 and the pressure sensor 24, perform calculation processing and display the resistance coefficient on a screen. The data processing and display device 4 is mainly based on the formula M ═ fr and the formula F ═ μ FNProcessing data. Where M is the torque measured by the torque signal coupler 12, r is the torque radius, F is the drag magnitude, μ is the drag coefficient, and F is the drag coefficientNIs the pressure perpendicular to the surface being measured.
In the test, the friction surface 20 is firstly contacted with the surface to be tested and pressure is applied to the surface, the pressure displayed by the data processing and displaying device 4 is observed along with the increasing of the applied pressure, and the specific required pressure is determined by the characteristics of the surface to be tested. When the pressure value reaches the target requirement, the pressure value is maintained unchanged, and then the motor 1 is started. Under the drive of the motor 1, the plum blossom coupling 3, the shaft of the torque signal coupler 12, the plum blossom coupling 11, the main shaft 10, the three-claw coupling 22 and the contact surface 20 all rotate, and the contact surface 20 rubs with the surface to be measured. The torque signal coupler 12 obtains the torque on the shaft, the pressure sensor 24 measures the surface pressure, the torque and the pressure are transmitted to the data processing and displaying device 4, the microprocessor in the data processing and displaying device 4 can calculate the resistance coefficient according to the torque, the pressure and the preset radius of the contact surface 20, and finally the measurement result is displayed on the screen of the data processing and displaying device.
Claims (5)
1. A portable surface resistance testing device is characterized by comprising a power driving device, a connecting device, a surface friction device, a pressure testing device, a torque testing device and a data processing and displaying device;
the power output shaft of the power driving device is connected with the torque testing device through a connecting device; the torque testing device is connected with the surface friction device through another connecting device and the main shaft; the pressure testing device is positioned in the device shell and is connected with the spring on the side edge in the surface friction device; the data processing display device is fixedly connected to the surface of the shell;
the surface friction device comprises a spring, a replaceable friction surface and a three-grab coupling; the input end of the three-grab coupling is fixedly connected with the output end of the main shaft, and a sleeve is arranged between the three-grab coupling and the main shaft; the output end of the three-grab coupling is provided with a three-grab coupling end cover, and the three-grab coupling is fixed on the back of the friction surface;
the pressure testing device is a miniature pressure sensor, is positioned on one side of the spring of the surface friction device and can measure the pressure applied by the spring;
during testing, the power device drives the main shaft and the friction surface to rotate, the friction surface of the surface friction device is in contact with a tested surface and applies pressure to the surface, the torque testing device tests the torque, and the pressure testing device tests the surface pressure; and calculating to obtain the resistance according to the torque and the radius of the contact surface, and then obtaining the resistance coefficient according to the pressure.
2. The portable surface resistance testing device of claim 1, wherein the power device uses a motor as a driving source, a power output shaft of the motor is inserted into the device shell and connected with a quincuncial coupling, and the other end of the quincuncial coupling is connected with the torque testing device.
3. The portable surface resistance testing device of claim 1, wherein the torque testing device comprises a torque sensor and a support base; the supporting seat is fixedly connected to the inner side of the device shell, and the torque sensor is fixedly connected to the supporting seat; and the two ends of the torque sensor are both connected with a plum coupling.
4. The portable surface resistance testing device of claim 1, wherein the main shaft is fixed by an arc-shaped shaft bracket.
5. A portable surface resistance testing device according to claim 1, wherein said data processing and display device comprises a microprocessor and an LED display screen; the microprocessor receives data of the torque testing device and the pressure testing device and calculates a surface resistance coefficient, and the LED display screen is used for displaying a resistance testing result.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011018297.6A CN112067548A (en) | 2020-09-24 | 2020-09-24 | Portable surface resistance coefficient testing arrangement |
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| CN202011018297.6A CN112067548A (en) | 2020-09-24 | 2020-09-24 | Portable surface resistance coefficient testing arrangement |
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| CN112067548A true CN112067548A (en) | 2020-12-11 |
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| CN202011018297.6A Pending CN112067548A (en) | 2020-09-24 | 2020-09-24 | Portable surface resistance coefficient testing arrangement |
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| JPH0618205A (en) * | 1992-06-30 | 1994-01-25 | Victor Co Of Japan Ltd | Friction/abrasion evaluating unit |
| JPH0792069A (en) * | 1993-09-27 | 1995-04-07 | Kawasaki Steel Corp | Method and device for abrasion test |
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