Anti-static PCB storage turnover cart
1. Product features
The turnover cart is composed of five parts: rigid support, adjustment assembly, static dissipative material assembly, wheel grounding assembly and anti-collision system.
1. The main body of the frame is made of stainless steel, and stainless steel is the conductor, and the surface is not coated with other high static charge source materials;
2. The adjusting components are made of high-grade spring steel and carbon steel galvanized;
3. The slot plate uses conductive PS or carbon fiber, which has its own conductivity and will not lose its conductivity due to changes in time, environment, and temperature. The conductive PS slot plate can withstand temperature from 80°C to 90°C; the carbon fiber slot plate can withstand temperature 100℃-116℃;
4. The resistance of the anti-static caster system: 1.0*103Ω-1.0*106Ω; the grounding chain is made of stainless steel;
5. The anti-collision cover is made of conductive rubber, which effectively reduces the electrostatic voltage generated by the collision and plays a good buffering effect.
2. Anti-static performance
The anti-static performance of the turnover vehicle is designed and manufactured in accordance with the relevant requirements of SJ/T10694-1996;
Three, test environment
25℃±2℃ RH: 55%±5%
Four, test method
1. Friction electrification voltage test (SJ/T10694-1996 friction electrification voltage test method)
A. The accuracy of the electrostatic voltmeter should be better than ±10% for measurement using a hundred-contact electrostatic voltmeter.
B. Hold a dry cloth (pure cotton or anti-static fabric) during the test, and immediately approach the friction part according to the method of using the electrostatic voltmeter, and observe the value displayed on the meter.
C. Repeat the test 5 times and take the average value.
2. Test of impact voltage
A. Use a non-contact electrostatic voltmeter to measure the maximum electrostatic voltage value generated during a collision. The accuracy of the electrostatic voltmeter should be better than ±10%. Use a stopwatch to record the electrostatic discharge time from the maximum voltage value to 100V.
B. Fix the electrostatic voltmeter above the track groove of the shelf of the turnover vehicle equipped with the anti-collision system, and adjust the test distance to the required value of the test.
C. Another car equipped with an anti-collision system hits a turnover car equipped with an electrostatic voltmeter at a speed of 0.5 m/s.
D. Record the highest electrostatic voltage and electrostatic discharge time generated at the moment of impact.
3. Resistance test
A. Test of surface resistance value
A.1 Place the two electrodes of the insulation resistance tester flat on the guide rail, and keep the distance between the two electrodes below 30CM but not in contact with each other.
A.2 According to the measurement operation method of the insulation resistance tester, record the measured value
A.3 Repeat the measurement more than 3 times and record the measured value
A.4 Calculate the average value of surface resistance
B system resistance value test (SJ/T10694-1996 vehicle platform face wheel system resistance measurement)
B.1 Take a 30CM-15CM*1M stainless steel plate, without any treatment on the surface, as a plate-shaped auxiliary electrode
B.2 Lay the auxiliary electrode flat on the floor, and the auxiliary electrode and the floor are required to have more than 3 points of contact;
B.3 Place one of the two electrodes of the insulation resistance tester on the guide rail, and one on the plate-shaped auxiliary electric board, and one wheel of the semi-circular vehicle is pressed on the plate-shaped auxiliary electric board to ensure that the wheels and the auxiliary electrode are connected. Close contact;
B.4 Test according to the use method of the insulation resistance tester and record relevant data;
B.5 Repeat the steps of B.2 and B.3 to measure and record the measured values of the system resistance between the other three wheels and the guide rail.
4. Conduction reliability test
Point-to-point test: (resistance value judgment method)
A. Put one of the two electrodes of the insulation resistance tester on any section of the guide rail, and the other on the hardware, and measure its resistance;
B. Measure the resistance of any point on the static dissipative material to the hardware according to the step A;
C. Analyze and determine the obtained data: if the resistance value exceeds the system resistance value requirement, the anti-static conductivity is poor, and there is insulation (not conduction) between the materials, and the reason must be found; the resistance value is basically related to static dissipation The surface resistance of the material is consistent and the conductivity is good.
Five, physical and mechanical properties
A. Load-bearing requirements of conductive wheels:
The wheels used in the turnover vehicle should meet the rated load requirements of the C and D levels in GB/T14688-1993; a single wheel should bear a load of 100-110 kg without deformation when it is stationary; after installation, a group of wheels (4) can bear a load of 300 kg Deformation and flexible rotation.
B. Load-bearing requirements of hardware structural parts:
The static load of the two layers is 50 kg, the deformation of the layer is less than 0.5MM, and the guide shaft is not deformed;
C. The load-bearing requirements of the finished car:
The finished car has a static load of 200 kg (each layer is loaded), the deformation of the laminate is less than 0.5MM, the wheels are not deformed, the column and guide shaft are not deformed, the body is not tilted, and the adjustment mechanism of the adjustment function is normal.
6. Scope of application
PCB board manufacturing, operation, storage workshop use
Seven, use matters needing attention
1. Overloading is strictly prohibited
2. Severe collision may cause the body to deform or even be unable to use it normally;
3. Don't store the PCB board with partial load to prevent the car from shaking when starting;
4. When adjusting the heel distance between layers, it must be adjusted in parallel to prevent damage to the adjustment components