GB/T 38651.2-2020Public information signs carrier - Part 2: Inspection method (English PDF)

4.1 Inspection methods required by design

According to the purchaser's design task list, the comprehensiveness and consistency of the design documents are tested.

4.2 Inspection methods required by process

4.2.1

Steel structure welding and fastener connection shall meet the requirements of GB 50205.

4.2.2

The connection and anti-corrosion performance of wooden structures should meet the requirements of GB 50206.

4.2.3

The information printing and spraying of the logo carrier, the adhesion, corrosion resistance, weather resistance and water resistance of the panel and structural paint film shall be in accordance with the following

Method for inspection.

a) Adhesion. Carry out a 6×6 cutting test according to the method specified in GB/T 9286, and perform inspection and grading after the test;

b) Corrosion resistance. Carry out salt spray corrosion test in accordance with the method specified in GB/T 1771, and the test time is 168h;

c) Weather resistance. conduct weather resistance test according to the method specified in GB/T 1865;

d) Water resistance. clamp the sample with two clamps and hang it vertically so that 2/3 of its area is immersed in distilled water at a temperature of 25°C±5°C in. Keep a distance of at least 2 cm between the bottom and sides of the partial separation container where the sample is immersed in water. After soaking for 24h, test it.

4.2.4

The information printing and spraying of the logo carrier, and the impact resistance of the panel and structural paint film shall be tested in accordance with the method specified in GB/T 1732.

According to the inspection, the drop height of the heavy hammer is 30mm.

4.2.5

The thickness of the coating on the sign carrier panel shall meet the requirements of GB/T 12333.

4.3 Inspection tools

According to the requirements of GB/T 38651.1, the inspection tools and uses of the sign carrier are shown in Table 1.

5.1 Screen printing, jet printing

If the graphic information of the logo carrier is made by screen printing and jet printing, it shall be inspected according to the following methods.

a) Positioning size. use vernier caliper and steel tape to measure and inspect;

b) Appearance. use visual inspection method to compare design requirements, color chart and sample inspection.

5.2 Engraving

The logo carrier graphic information engraving hollow, engraving and filling the depth, texture and surface paint color, according to the design requirements, color card and

The provisions of GB/T 38651.1 are inspected by visual inspection.

5.3 Film

The logo carrier graphic information paste film is inspected according to the following methods.

a) Finished product inspection. adopt the comparison method, compare the design requirements and color card inspection;

b) Adhesion test. use a ruler with a minimum scale of not more than 1mm to measure a 150mm×25mm rectangular color on the sample

Cut the film with a knife, peel off the adhesive surface 10mm along the 25mm short side, and then hang the sample horizontally with the logo side down (see figure 1). Hang a weight of 800g±5g on the peeled end of the color film. Make it sag with the surface of the sample plate at a 90° angle.

After 5 minutes, measure the length L of the peeled film.

For multilayer pasted color films, the adhesion between the upper color film and the lower color film should also be measured according to the above method.

During the test, a support can be used to support the sign carrier to keep it level after hanging a heavy object.

Figure 1 Schematic diagram of peel test

6.1 General requirements

The inspection method for the information production of the panel type sign carrier shall comply with the provisions of Chapter 5.

6.2 Size, flatness, seam

6.2.1

The allowable deviation of the panel size of the sign carrier shall be measured and inspected with a steel tape.

6.2.2

The allowable deviation of flatness, verticality and levelness of the sign carrier panel shall be 2m, verticality detector (or plumb hammer) and water

The flat ruler is measured and inspected.

6.2.3

The width, straightness and height difference of the panel joints of the sign carrier shall be measured and inspected with a feeler gauge, pull-through wire and steel ruler.

6.3 Surface coating

6.3.1

The gloss and thickness of the paint film of the sign carrier panel shall be inspected according to the following methods.

a) The surface gloss of the paint film shall be inspected according to the method specified in GB/T 3181;

b) The thickness of the paint film shall be inspected in accordance with the method specified in GB/T 13452.2.

6.3.2

The appearance quality of the coating on the sign carrier panel shall be inspected by visual inspection.

6.3.3

The transfer and distressing process of the sign carrier panel shall be compared with the design requirements and model inspection by visual inspection.

6.4 Color, fixing, opening and access (door)

6.4.1

The surface color of the sign carrier panel shall be inspected according to the color value specified in the design by visual inspection against the color card and the color of the model.

6.4.2

The type and position of the fixing screw of the sign carrier panel shall be measured and inspected by steel ruler and steel tape. The surface color of the fixing screw,

Use visual inspection to check the color of the connected panel. The firmness of the fixing screws is tested by hand feeling.

6.4.3

The opening of the sign carrier panel and the style of the access (door) shall be inspected by visual inspection against the design requirements. The opening of the access (door) shall be

Actual measurement method inspection.

6.5 Heat dissipation holes

The style of the heat sink of the sign carrier is checked by visual inspection against the design requirements.

7.1 General requirements

The information production and panel inspection methods of the structural sign carrier shall meet the requirements of Chapter 5 and Chapter 6.

7.2 Structural dimensions

7.2.1

The straightness, flatness and parallelism of the sign carrier structure shall be tested in accordance with the method specified in GB/T 19804.

7.2.2

The angular deviation of the sign carrier structure shall be measured and inspected with a protractor.

7.3 Structural connection

7.3.1

The wall thickness of the steel members, steel pipes and connecting plates of the sign carrier shall be measured and inspected by vernier calipers.

7.3.2

The bolt connection pair of the steel structure of the sign carrier shall be inspected in accordance with the method specified in GB/T 1231.

7.3.3

The anti-corrosion, anti-rust, sealing treatment and color of the connection points of the exposed steel structure of the sign carrier shall be in accordance with the provisions of 7.4.1, 7.4.2 and 7.4.3 test.

7.3.4

The appearance quality of wood structure shall be inspected by visual inspection.

7.4 Structural corrosion protection

7.4.1

The steel structure adopts hot-dip galvanized anticorrosion, and the coating performance requirements shall be tested in accordance with the method specified in GB/T 13912.

7.4.2

If the steel structure is coated with anticorrosive paint, the thickness of the paint film shall be inspected in accordance with the method specified in GB/T 13452.2.

7.4.3

The surface color of anti-corrosion coating shall be compared with design requirements and sample inspection by visual inspection method.

7.4.4

When the wood structure is connected by metal connectors, the corrosion rate of wood preservatives on the metal connectors shall be in accordance with GB/T 34726

Method test.

8.1 General requirements

The inspection methods of the layout information production, panel and structure of the luminous sign carrier shall comply with the provisions of Chapter 5, Chapter 6, and Chapter 7.

8.2 Brightness

8.2.1

The light-emitting surface is divided into a grid of 150mm×150mm, and the luminance meter is used for measurement and inspection.

8.2.2

According to the light and shade of the surrounding environment, the human eye can clearly identify the information content of the public information sign, without glare, and use the visual method at a 45° angle.

test.

8.2.3

For the sign carrier with LED electronic display, the brightness of the display is adjusted and tested by the actual measurement method.

8.3 Uniformity of Illumination

8.3.1

The uniformity of illuminance on the surface of the sign carrier, take 9 test points within the scope of visual requirements (see Figure 2), and measure with an illuminance meter test.

Figure 2 Illumination uniformity test point 8.3.2 The luminous color and brightness of the sign carrier are basically the same, and the visual inspection method is used to check that there is no miscellaneous color, light spot and other problems that cause visual discomfort.

8.4 Impact of light environment

8.4.1

The brightness adjustment function of the luminous sign carrier is adjusted and tested by the actual measurement method.

8.4.2

The stroboscopic light source of the luminous sign carrier shall be measured and inspected by a stroboscopic tester.

8.4.3

The color temperature of the light source of the luminous sign carrier is measured and inspected by a spectrum tester.

8.5 Color rendering of light source

Use the spectrum tester to measure and inspect.

8.6 Inspection of electrical installations

8.6.1 Cable, light source, power supply

8.6.1.1

For electrical equipment such as cables or wires, light sources, power sources, etc. of the sign carrier, inspect the product specifications of electrical equipment or adopt laboratory tests.

Method of testing.

8.6.1.2

Whether the power supply installation position of the sign carrier affects the luminous effect shall be inspected by visual inspection. The firmness of the power supply installation

Sense test.

8.6.1.3

Whether the sign carrier is reliably grounded, use a grounding resistance tester to check. The leakage protection device is inspected by visual inspection.

8.6.2 Line laying

The laying position, circuit number and wiring polarity of the sign carrier shall be inspected by visual inspection. The firmness of the wire connector

Sense test.

8.6.3 Energy saving control

8.6.3.1

The energy efficiency level of the light source of the sign carrier is calculated based on the measured luminous flux (lm) and the input power (W) of the lamp.

8.6.3.2

The control device of the sign carrier shall be inspected by visual inspection.

8.6.3.3

The power density of the sign carrier, the power (W) of the light source input measured in the rated voltage or the rated voltage range, according to the measured

Calculate the power density based on the input power of the light source and the number of light source arrangements.

references

[1] GB/T 24827-2015 Road and street lighting performance requirements

[2] GB 50210-2018 Building Decoration Engineering Quality Acceptance Standard

[3] GA480.1-2004 General technical requirements for fire safety signs Part 1.General requirements and test methods […]