Công tắc dừng khẩn cấp kiểu giật dây KHJ0.5/12 KHJ0.5/24

Intrinsically safe emergency stop switch for coal mine 

1. Product introduction

     KHJ0.5/24 Intrinsically Safe Emergency Stop Switch for Coal Mine is suitable for underground coal mine and can realize emergency stop in case of belt conveyor accident. Explosion-proof and intrinsically safe general-purpose controllers are used together.

     2. Structural characteristics

     The shell is formed by casting, which is small in size and light in weight. The operation lever is flexible and reliable. Metal parts are treated with anti-rust and anti-corrosion treatment, and fasteners have measures to prevent automatic loosening.     

     3. Technical parameters

     1. Action stroke: 15mm Tolerance: ±3mm

     2. Action force: 50~100N

     3. Reset force: 40~80N

     4. Contact resistance: The contact resistance of the closed contact is not greater than 0.1Ω.

     5. Action performance: The switch acts and locks immediately after being acted by the action force, and can only be unlocked after manual reset.

     6. Contact capacity: DC12V/0.5A

     7. Dimensions: 156mm×91mm×181mm

     8. Weight: 2kg

1. Purpose and scope of application:

khj0.5/12 mine intrinsically safe emergency stop switch (hereinafter referred to as emergency stop switch) is suitable for underground coal mines containing explosive gas (ch4) environment and open-pit coal mines, coal preparation plants and other workplaces, as a mining belt conveyor It is used to detect the emergency stop signal of the integrated protection and control device of the machine.

2. Main technical features:

1. Explosion-proof type: mine intrinsically safe type, explosion-proof mark: exibi;

2. Model meaning:

k ----- switch

h ----- Intrinsically safe

j ----- emergency stop

0.5/12- Contact capacity

3. Executive standards: mt/t 647-1997, q/hwt92-2007;

4. Contact capacity 12v/0.5a;

5. Contact resistance ≤ 0.1ω, after vibration and impact ≤ 0.2ω;

6. Action performance: when a force of 40n～200n is applied outward on the pull ring on either side of the emergency stop switch, the contact state in the emergency stop switch should be reversed and self-locked; apply 40n outward on the corresponding reset pull ring When the force of ~200n is applied, the contact state in the emergency stop switch should be restored.

7. Dimensions: 380mm×170mm×72mm;

8. Mass: 3kg.

3. Environmental conditions:

(1) Normal working conditions:

1. The ambient temperature is -5℃～+40℃;

2. The altitude does not exceed 2000m (air pressure 86kpa ~ 110kpa);

3. The relative humidity of the surrounding air is less than or equal to 98%rh (25℃);

4. In mines containing explosive gases such as methane;

5. There is no significant shaking and shock vibration;

6. In an environment without gas or vapor that destroys insulation;

7. A place that can prevent dripping water.

(2) Bad storage and transportation conditions:

1. High temperature: 60℃;

2. Low temperature: -40℃;

3. Average relative humidity: 95% (25℃).

Fourth, the structure overview:

Emergency stop switch consists of shell, travel switch, emergency stop pull ring, reset pull ring, wiring terminal and other parts.

5. Working principle:

When a force of 40n～200n is applied to the emergency stop pull ring on either side of the emergency stop switch and a displacement occurs, the travel switch in the emergency stop switch acts, the contact state is reversed, and self-locking; When an external force of 40n～200n is applied, the limit switch in the emergency stop switch operates again, and the contact state is restored.