CN104897498A - Method for testing wear resistance of surface coating of profile via falling sand tester - Google Patents

Abstract

The invention discloses a method for testing the wear resistance of profile surface coatings by using a falling sand testing machine. The method includes the following steps: adjusting the inclination angle of the profile plate through the rotating shaft of the sample support, loading the sand material into the sand holding funnel, The sand material flows out from the discharge port of the sand-filling funnel, falls vertically in the conduit along the sand guide needle, and falls onto the profile plate, and then slides along the profile plate to the material guide plate, and is guided into the sand material by the material guide plate box; the sand material keeps falling until the sand falling force point of the profile plate is worn through, the throttle valve is closed, the sand falling is stopped, the weighing scale measures the quality of the sand material, and the wear resistance of the surface coating of the profile plate is measured. The invention has the following advantages: 1. By grinding through the quality of the surface coating of the profile, the wear resistance of the surface coating of the profile can be accurately measured, and the concentration of the sand material is strong; 2. The conduit prevents the wind force from affecting the freely falling sand material; the lifting mechanism Lift the sand material weighing mechanism to the sand filling funnel, and the sand material in the sand material weighing mechanism flows into the sand filling funnel to realize recycling.

Description

A method for testing the wear resistance of profile surface coatings using a falling sand testing machine

technical field

The invention relates to a method for testing the wear resistance of profile surface coatings by using a falling sand testing machine.

Background technique

Aluminum alloy building profiles are mainly used in the construction industry and the field of housing construction. They have the advantages of light weight, beautiful structure, corrosion resistance, and simple processing. With the change of the environment and the improvement of living standards, the requirements for the corrosion resistance of the surface of aluminum alloy building profiles are getting higher and higher, so the measurement of the wear resistance of the surface coating of aluminum alloy building profiles is particularly important. Since the specific method and scope of the determination of the sand concentration ratio are not specified in the wear resistance test method stipulated by the anodic oxide film, the results of the wear resistance test are different, and some even cannot detect the wear resistance of the surface coating, which is serious. It affects the accurate detection of profile surface quality and brings certain troubles to aluminum profile manufacturers and users.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for accurately measuring the wear resistance of the surface coating of a profile by using a falling sand tester to detect the wear resistance of the surface coating of the profile in view of the deficiencies in the prior art.

In order to solve the above-mentioned technical problems, the technical solution of the present invention is: a method for testing the wear resistance of the profile surface coating by using a falling sand testing machine. Funnel, the outlet of the sand-filling funnel is connected to the upper end of the conduit, and a workpiece is arranged below the lower end of the conduit, and a flow regulating valve for controlling the leakage rate is arranged in the described sand-filling funnel, and the workpiece is Profile plate, the profile plate is arranged obliquely, a material guide plate is provided under the profile plate to guide falling sand into the sand weighing mechanism, the support frame is provided with a sample support, and the test The sample support is provided with a rotating shaft to adjust the inclination angle of the profile plate, the material guide plate is connected to the sample support, and an elastic clamp arm for clamping the profile plate protrudes from the rotating shaft , above the material guide plate is provided with a positioning pin, the positioning pin and the sand falling force point of the profile plate are at the same horizontal position, and the testing machine also includes a guide vertically extending from the discharge port of the sand holding funnel A sand guide needle in the pipe, a throttling valve is provided on the conduit, the sand material weighing mechanism is arranged on the lifting mechanism, a support arm is provided on the support frame, and a support arm is provided on the support arm. A guide rail arranged longitudinally along the support arm, the lifting mechanism includes a support platform supporting the sand material weighing mechanism, a slider that slides longitudinally on the guide rail controlled by a screw drive mechanism, the side wall of the support platform and The slider is connected, and the sand material weighing mechanism includes a weighing scale and a sand material box arranged on the weighing scale. The top of the sand material box is provided with a sand inlet. There is an inclined sand guide plate, the wall of the sand material box is provided with a sand pipe connected with the inside of the box, and the inlet end of the sand pipe is provided with an inlet control opening/closing of the sand pipe. A control valve, the method comprising the steps of:

a) Adjust the inclination angle of the profile plate through the rotating shaft of the sample support, and control the distance between the stress point of the profile plate and the sand funnel through the positioning pin, the sand material is loaded into the sand funnel, and the sand material is fed by the sand filling funnel. The discharge port of the funnel flows out, falls vertically in the conduit along the sand guide needle, and falls to the profile plate, and the sand material then slides along the profile plate to the material guide plate, and is guided into the sand material box by the material guide plate;

b) The above-mentioned sand material has been falling until the sand falling force point of the profile plate is worn through, the throttle valve is closed, the sand falling is stopped, the weighing scale measures the quality of the sand material, and the wear resistance of the surface coating of the profile plate is measured;

c) Slide the support platform upwards through the guide rails to the upper part of the support frame, and the sand flows into the sand funnel through the sand outlet pipe of the sand box to realize the recycling of the sand.

In step a, the inclination angle of the profile plate is 40°-50°, and the distance between the stress point of the profile plate and the sand-filling funnel is controlled by the positioning needle to be 0.9-1.1m.

In step b, the formula for measuring the wear resistance of the surface coating of the profile is: f=m/ho, where f is the wear coefficient, m is the mass of abrasive consumed by wearing through the surface coating of the profile, and ho is the surface coating of the profile layer thickness.

The present invention adopts the above method, which has the following advantages: 1. By grinding through the quality of the surface coating of the profile, the wear resistance of the surface coating of the profile can be accurately measured, and the sand material is highly concentrated; Influence: The lifting mechanism raises the sand weighing mechanism to the sand filling funnel, and the sand in the sand weighing mechanism flows into the sand filling funnel to realize recycling.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail;

Fig. 1 is the structural representation of falling sand testing machine in the present invention;

Fig. 2 is the structural representation that profile plate is arranged on the sample support in the present invention;

In Figures 1 to 2, 1. Support frame; 2. Sand funnel; 3. Conduit; 4. Flow regulating valve; 5. Profile plate; 6. Material guide plate; 7. Sample support; 8. Rotating shaft ;9, elastic clip arm; 10, positioning needle; 11, guide sand needle; 12, throttle valve; 13, support arm; 14, support platform; 15, weighing scale; 16, sand box; 17, guide sand plate; 18, sand pipe;

Detailed ways

As shown in Figure 1, a method for testing the wear resistance of profile surface coatings using a falling sand testing machine, the falling sand testing machine includes a support frame 1, a sand holding funnel 2 arranged on the upper part of the support frame 1, and the outlet of the sand holding funnel 2 The feed port is connected with the upper end of the conduit 3, and a workpiece is arranged below the lower end of the conduit 3. The inner angle of the sand-filling funnel 2 can be 60°, the discharge diameter can be 5mm, and the maximum capacity of the sand-filling funnel 2 is 7.5L. The sand filling funnel 2 is provided with a flow regulating valve 4 to control the leakage rate. By regulating the flow regulating valve 4, the flow of sand material leaking is controlled to reach a specified flow rate (can be 310g/min-330g/min). The workpiece should be cut on the decorative surface of the profile. When the sample cannot be directly sampled on the profile, a flat sample made of the same material and the same processing conditions as the product can be used. The workpiece is a profile plate 5, and the profile plate 5 is arranged obliquely. Below the profile plate 5, there is a material guide plate 6 that guides the falling sand into the sand material weighing mechanism. The support frame 1 is provided with a sample support 7, the sample support 7 is provided with a rotating shaft 8 for adjusting the inclination angle of the profile plate 5, and the material guide plate 6 is connected to the sample support 7; Fig. 2 shows the sample Schematic diagram of the structure of the profile plate on the support 7 parallel to the horizontal direction. During use, the profile plate 5 is adjusted to an inclined setting through the rotating shaft 8, so that the angle between the profile plate 5 and the horizontal plane is 40°-50°, and the best is 45° , After adjustment, lock the rotating shaft with bolts to fix it.

An elastic clamp arm 9 for clamping the profile plate 5 protrudes from the rotating shaft 8 . A positioning pin 10 is arranged above the material guide plate 6, and the positioning pin 10 is at the same horizontal position as the sand falling force point of the profile plate 5. The positioning pin 10 controls the distance between the sand falling force point of the profile plate 5 and the sand funnel 2, and the distance is 0.9-1.1m. The function of the positioning pin 10 is to ensure that the sand material falls freely to the profile plate when each sample is tested. 5. The contact heights are all the same, reducing errors caused by different heights. The testing machine also includes a sand guide needle 11 extending vertically from the outlet of the sand holding funnel 2 into the conduit 3 . The effect of conduit 3 is to keep out the wind, and after the sand material flows out of the sand-filled funnel, it prevents wind from having an impact on the freely falling sand material. A throttling valve 12 is arranged on the conduit 3, and after each test is completed, the throttling valve is turned off immediately to prevent the sand material from continuing to flow out, so as to avoid affecting the test result, and then open it when it needs to be tested again. The sand material weighing mechanism is arranged on the lifting mechanism. The support frame 1 is provided with a support arm 13, and the support arm 13 is provided with a guide rail longitudinally arranged along the support arm. The sliding block is connected with the side wall of the supporting platform.

The sand material weighing mechanism comprises weighing scale 15, is arranged on the sand material box 16 on the weighing scale 15, and the top of sand material box 16 is provided with sand inlet, and the sand inlet is provided with the sand guide plate 17 that tilts to set, and sand material The box wall of the box 16 is provided with a sand outlet pipe 18 communicating with the inside of the box, and the inlet end of the sand outlet pipe 18 is provided with a control valve for controlling the opening/closing of the inlet of the sand outlet pipe. The sand material adopts standard black silicon carbide particles, and the suitable particle size of the sand material is F80 specified in GB/T2480. The sand material can be reused 50 times, and should be dried at 105°C for each use. The test temperature is room temperature and should be sheltered from wind.

The method of using a falling sand testing machine to detect the wear resistance of the profile surface coating includes the following steps:

a) Adjust the inclination angle of the profile plate through the rotating shaft of the sample support, so that the inclination angle of the profile plate is 40°-50°, and control the distance between the sand falling force point of the profile plate and the sand funnel through the positioning pin. The distance is 0.9-1.1m, the sand material is put into the sand holding funnel, the sand material flows out from the discharge port of the sand holding funnel, falls vertically in the conduit along the sand guide needle, and falls to the profile plate, and then the sand material flows along the sand guide needle. The profile plate slides to the material guide plate, and is guided into the sand material box by the material guide plate;

b) The above-mentioned sand material has been falling until the sand falling force point of the profile plate is worn through, the throttle valve is closed, the sand falling is stopped, the weighing scale measures the quality of the sand material, and the wear resistance of the surface coating of the profile plate is measured. The formula for measuring the wear resistance of the surface coating is: f=m/ho, where f is the wear coefficient in grams per micron (g/μm), and m is the mass unit of sand consumed to wear through the surface coating of the profile is grams (g), ho is the thickness of the profile surface coating, in microns (μm);

c) Slide the support platform upwards through the guide rails to the upper part of the support frame, and the sand flows into the sand funnel through the sand outlet pipe of the sand box to realize the recycling of the sand.

The present invention has been exemplarily described above in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above methods, as long as various improvements of the technical solutions of the present invention are adopted, or directly applied to other occasions without improvement, All within the protection scope of the present invention.

Claims (3)

1. one kind uses the method for sand trial machine testing Surface of profile coating abrasion performance, described sand trial machine comprises bracing frame (1), be arranged on the Sheng sand hopper (2) on bracing frame (1) top, the discharging opening of described Sheng sand hopper (2) is connected with conduit (3) upper end, workpiece is provided with below described conduit (3) lower end, the flow control valve (4) controlling to leak material speed is provided with in described Sheng sand hopper (2), described workpiece is profile plate (5), described profile plate (5) is obliquely installed, described profile plate (5) below is provided with the stock guide (6) knockout being imported sand material Weighing mechanism, described bracing frame (1) is provided with sample bearing (7), described sample bearing (7) is provided with the rotating shaft (8) at adjustment described profile plate (5) angle of inclination, described stock guide (6) is connected on described sample bearing (7), described rotating shaft (8) is extended with the elasticity jig arm (9) of the described profile plate of clamping (5), described stock guide (6) top is provided with pilot pin (10), described pilot pin (10) is in same level position with the knockout stress point of profile plate (5), described testing machine also comprises vertically being stretched to by the discharging opening containing sand hopper (2) leads sand pin (11) in conduit (3), described conduit (3) is provided with throttling valve (12), described sand material Weighing mechanism is arranged on elevating mechanism, described bracing frame (1) is provided with sway brace (13), described sway brace (13) is provided with the guide rail longitudinally arranged along sway brace, described elevating mechanism comprises the brace table (14) of propping sand material Weighing mechanism, the slide block of longitudinal sliding motion on described guide rail is controlled by lead screw transmission mechanism, the sidewall of described brace table is connected with described slide block, described sand material Weighing mechanism comprises weight scale (15), be arranged on the sand hopper (16) on weight scale (15), described sand hopper (16) top is provided with sand inlet, described sand inlet be provided be obliquely installed lead sand plate (17), the tank wall of described sand hopper (16) be provided be communicated with in case go out sandpipe (18), the described entrance point going out sandpipe (18) is provided with the opening/closing operation valve of the import that controls out sandpipe, it is characterized in that: described method comprises the following steps:

A) by the angle of inclination of the rotating shaft adjustment profile plate of sample bearing, and the knockout stress point of profile plate and the distance of containing sand hopper is controlled by pilot pin, sand material loads to be contained in sand hopper, sand material is flowed out by the discharging opening containing sand hopper, along leading the vertical drop in conduit of sand pin, and dropping down onto on profile plate, sand material and then slide to stock guide along profile plate, imports sand hopper by stock guide;

B) above-mentioned sand material falls until the knockout stress point of profile plate is worn through always, closes throttling valve, stops knockout, and the quality of weight scale metering sand material, measures profile plate surface coating wearing quality;

C) brace table is passed through guide rail upward sliding, slide to bracing frame top, sand material flows into Sheng sand hopper by the sandpipe that goes out of sand hopper, realizes recycling of sand material.

2. the method for use sand trial machine testing Surface of profile coating abrasion performance according to claim 1, it is characterized in that: in a step, the angle of inclination of profile plate is 40 °-50 °, and the knockout stress point being controlled profile plate by pilot pin is 0.9-1.1m with the distance of containing sand hopper.

3. the method for use sand trial machine testing Surface of profile coating abrasion performance according to claim 1, it is characterized in that: in b step, the formula that Surface of profile coating abrasion performance is measured is: f=m/ho, wherein, f is barasion coefficient, m is the sand material quality that worn out Surface of profile coating consumes, and ho is the thickness of Surface of profile coating.