Insulated ladder

Insulated ladders are commonly used as specialized climbing tools in power engineering, telecommunications engineering, electrical engineering, hydropower engineering, and other fields. The good insulation characteristics of the insulated ladder ensure the safety of workers to the greatest extent possible.
matters needing attention
Before use
1. Before each use of the ladder, it is necessary to carefully inspect the surface, spare parts, ropes, etc. for cracks, severe wear, and damage that may affect safety.
2. When using a ladder, a hard and flat ground should be chosen to prevent danger from tilting.
3. Check if all ladder feet are in good contact with the ground to prevent slipping.
4. If the height of the ladder exceeds 5 meters, please make sure to set up a F8 or higher stay wire in the middle and upper part of the ladder.
5. It is strictly prohibited to use ladders when feeling dizzy, dizzy, drunk or uncomfortable.
6. When working around doors and windows, it is necessary to first fix the doors and windows to prevent them from hitting the ladder when opening or closing the door.
7. Be extra careful or try not to use ladders under strong wind conditions.
8. The most suitable height for using a ladder correctly is never to add or place anything on or off the ladder to increase its height.
9. Without the manufacturer's permission, the ladder shall not be attached with other structures, and damaged ladders shall not be used or repaired.
10. When lifting a ladder, it is strictly prohibited to hold the crossbar by hand to prevent cutting or injuring fingers.
When in use
1. It is absolutely prohibited to exceed the working load of the ladder.
2. The foot of the ladder has anti slip effect. But there is still a need for personnel to directly hold the ladder with their hands to remind for protection (while preventing the ladder from tilting), and to step on the bottom feet of the ladder with their feet to prevent movement.
3. When climbing a ladder, it is necessary to wear flat shoes to avoid slipping and accidents.
4. When climbing a ladder or working, always keep your body in the middle of the crossbar of the ladder, keep your body upright, and do not extend outside, otherwise you may have accidents due to losing balance.
5. When there are people on the ladder, it is strictly prohibited to shift.
6. Only one person is allowed to climb or stand on the ladder.
After use
After completing the work, please wipe the ladder clean and store it in a dry place.
Requirements for the production and use of insulated ladders:
The material, size, strength, etc. of insulated ladders (hereinafter referred to as ladders) shall comply with relevant requirements such as GB/T 17889.1-1999 and GB/T 17889.2-1999.
The materials used for making ladders can be fiberglass, metal, wood, etc.
The length of a straight ladder should not exceed 6m, and the entire extension length of an extended ladder should not exceed 11m. Limiting devices should be installed to ensure that the extended part overlaps with the non extended part by at least 1m.
All personnel should receive training or guidance before using the ladder.
The use of temporary ladders made on site is strictly prohibited.
It is strictly prohibited for individuals with dizziness or those who may affect their physical balance due to medication to use ladders.
Inspection requirements for insulated ladders:
The using unit should inspect the newly purchased insulated ladder before putting it into use, and regularly inspect and affix a qualified inspection label during the use period. At the same time, the ladder should be inspected before each use to ensure that it is always in good condition.
Before using a ladder, ensure that the safe working load does not exceed its maximum allowable load.
Defective ladders should be stopped from use, labeled as "prohibited from use", and repaired promptly.
When the insulated ladder experiences severe bending, deformation, or damage that cannot be repaired, it should be scrapped in a timely manner. The scrapped ladder should be damaged to ensure that it cannot be used again.
Inspection content of insulated ladder:
Is the function of the ladder suitable for the job;
The safety of the ladder, whether there are short steps or damage, breakage, corrosion, deformation, or cracks on the ladder body;
Whether the safety anti slip feet are in good condition;
Is there a qualified inspection mark on the ladder;
Whether the limiter is intact;
The condition of the stepping stick or pedal, whether there is soil, oil or grease attached;
Whether the hardware components are intact (pull rods, rivets, braces, nuts, bolts, feet);
Whether the stretching rope and pulley are intact;
Is the binding rope fixed to all vertical ladders, extension ladders, and herringbone ladders above 2.4m (including 2.4m) intact.
After passing the inspection, identification should be done properly. You can brush color rings or paste labels
classification
Insulated ladders are divided into insulated single ladder, insulated soft ladder, insulated bamboo joint ladder (fishing rod ladder), insulated joint ladder, insulated single straight ladder, insulated composite ladder, insulated herringbone ladder, insulated lifting ladder (insulated herringbone single lifting ladder, insulated telescopic composite ladder, insulated telescopic herringbone ladder), insulated stool, insulated edge step stool, insulated high and low stool, insulated high stool, insulated lifting platform, fully insulated scaffolding, etc.
Product features
(1) Non conductive, novel appearance, beautiful and generous
(2) Corrosion resistance (with corrosion resistance to various gas and liquid media such as acid, alkali, organic solvents, and salts. According to actual usage requirements, ortho benzene, meta benzene, and vinyl resins can be economically selected as matrix materials), corrosion resistance, and color fading resistance.
(3) Lightweight and easy to handle
(4) Low water absorption and good flame retardancy (the flame propagation rate of ordinary flame retardant grilles (ASTM E-84) does not exceed 25; The flame propagation rate of advanced flame-retardant vinyl grating shall not exceed 10. The oxygen index shall not be less than 28 (GB 8924).
(5) High strength, lightweight (the density of fiberglass grating is not more than 2, only 1/4 of steel and 2/3 of aluminum. Its strength is 10 times that of rigid polyvinyl chloride, and its absolute strength exceeds that of aluminum and ordinary steel), impact resistance, insulation, and excellent magnetic permeability.
manufacturing process
The insulation ladder adopts unsaturated resin and glass fiber polymer extrusion manufacturing process, and the material is epoxy resin combined with pin bar technology. The surface of the shaft type steel parts is coated with protective coating; The surface of insulated laminated material parts is treated with insulating paint. The anti slip design of the ladder support and foot is not easy to fatigue, and the appearance of each component of the ladder has no sharp edges, high safety level, and strong insulation performance; Low water absorption and corrosion resistance.
Product materials
Fiberglass reinforced plastic, also known as epoxy resin, is an insulating material with high hardness and high insulation performance.
Principle of Invention
The electron band theory states that electrons in solids are only allowed to exist in certain energy states, and these energy states can form separate energy bands.
Electrons tend to occupy the band with the lowest energy first. The insulating valence band is the band with the highest energy that can be filled at absolute zero. The band above the valence band is called the conduction band, and the gap between the valence band and the conduction band is called the energy gap. Above absolute zero, the valence band electrons are excited and transition to the conduction band, becoming conduction band electrons and leaving holes in the valence band. According to band theory, energy bands filled with electrons or empty energy bands do not contribute to conductivity, and conductivity only comes from partially filled energy bands. The conduction band electrons and valence band holes are collectively referred to as carriers. The metal conduction band is partially filled, resulting in good conductivity. For semiconductors and insulation ladders, the valence band of the insulation ladder is filled at absolute zero, while the conduction band has no electrons. At room temperature, semiconductors have a small energy gap and can form electron hole pairs through thermal excitation, thus possessing a certain degree of conductivity. On the contrary, the vast majority of insulated ladders typically have very large bandgap widths, making it difficult for valence band electrons to be excited to the conduction band. Therefore, the carrier concentration of insulated ladders is extremely low, and correspondingly, the conductivity is also extremely low, or in other words, this material is insulated.
Product quality
On the premise of ensuring safety, the better the quality of the insulation ladder, the lighter its weight. Because higher performance raw materials, more advanced production processes, and more scientific structural design are necessary to reduce product weight while ensuring safety. Lighter insulated ladders are more convenient to use.
Electrician insulation ladder is a ladder made of fiberglass and epoxy resin as the main materials and extruded fiberglass profiles. It has the advantages of high strength, corrosion resistance, beautiful appearance, and good electrical insulation performance. Usually able to withstand a power frequency test voltage of "220V/m". Therefore, fiberglass ladders can be used as a safe climbing tool for the power system. Used to replace metal ladders and bamboo and wood ladders. Prevent electric shock accidents caused by induced electricity and misoperation. Fiberglass ladders that have undergone strict testing and inspection can also be used as ladders for high-voltage live work.
Main technical parameters of electrical insulation ladder
1. Insulation material density ≥ 1.95g/cm3
2. The water absorption rate of insulation materials is less than 0.40%
3. Material tensile strength>350Mpa
4. Material surface hardness 50 (Pap)
5. Insulation material surface withstand voltage>12kV (r. m.s)
6. Design load>880 (N)
(1) Appearance and assembly
1. Appearance: The appearance of each component of the ladder should not have sharp edges and should be rounded.
2. Assembly: Should comply with the provisions of YB3205
(2) General requirements
1. Raw materials should be pre selected for inspection
2. Aluminum alloy materials should undergo surface anodizing treatment, and shaft steel parts should have a protective coating on their surface; The processing surface of insulated laminated materials should be treated with insulating paint.
3. The surface roughness of metal components should be ≤ 6.3
The machining surfaces of each component should be regular and flat. The surface of insulation components should be smooth, without bubbles, wrinkles, or cracks, and there should be no obvious scratches or signs of overheating. The color should be the natural color (from light yellow green to brown)
(3) Power frequency withstand voltage test
1.450KV/1.8m, 1min
There should be no breakdown or other abnormalities during the test process.
Material properties
The insulation material density of the insulation ladder is ≥ 1.95g/cm3; The water absorption rate of insulation materials is less than 0.40%; Material tensile strength>350Mpa; The surface hardness of the material is 50 (Pap); Insulation material surface withstand voltage>12kV (r. m.s); The surface of insulation components with a design load greater than 1500N should be smooth, without bubbles, wrinkles or cracks, and without obvious scratches and overheating marks. The color should be natural.