The first thing to consider when choosing a vacuum generator is cost saving. Vacuum generators are used in automation to improve production efficiency on the one hand, and reduce labor and costs on the other hand. Therefore, reducing costs will truly bring out the true nature of automation. practical meaning.

Therefore, a reasonable selection of vacuum generators can not only reduce costs, but also reduce energy consumption, and can effectively increase production speed. Unreasonable selection of gas source consumption costs will even exceed labor costs and the cost of the machine itself.

Reasonable choices for vacuum generators are:

extremely low energy consumption,

long service life,

faster response time

The basic structure of any vacuum system is indispensable (except for the vacuum pump), that is

(1) Compressed air source (air compressor): the supply source of the vacuum generator

(2) Air circuit switch (solenoid valve): because it is necessary to control the on-off time of the air supply

(3) Vacuum generator body: components necessary to generate vacuum

These three conditions constitute a vacuum generator system, which can move objects. But this is not enough, because the manipulator does not know when to lift and release it. If it is lifted too early, the product will not be absorbed, and if it is lifted too late, it will consume energy, and it is not good for improving production efficiency.

Therefore, to design a reasonable vacuum handling system, the following items are needed

(1) Reasonable nozzle flow selection

Commonly used nozzle diameters are 0.5mm, 0.7mm, 1.0mm, 1.5mm, 2.0mm

(2) Vacuum switch

Vacuum switch has mechanical type, electronic type, and electronic type is divided into ordinary type and digital display type.

(3) Vacuum break valve

When releasing the object blow air for quick release of the workpiece

How to choose nozzles, how to achieve the most energy-saving, how to achieve the fastest speed?

When designing a robotic handling system, first determine the maximum workpiece suction weight, and then determine the suction force. The calculated suction is more than 2.5 times the weight of the workpiece, which is the safety factor (to ensure that the workpiece is not firmly attached to the suction cup during handling)

The suction calculation formula is: W=P*S*0.0102/μ

W is the total suction (kgf)

P is the degree of vacuum (Kpa)

S is the suction cup area (cm^2)

0.0102 is the suction force per Kpa per square centimeter (kgf)

μ is the safety factor (when μ=1, the obtained value is the theoretical suction)

It can be seen that the suction force is related to the degree of vacuum and the area of the suction cup, but has nothing to do with the diameter of the nozzle, because the highest vacuum degree produced by nozzles with different diameters is the same. However, the one-sided pursuit of high vacuum degree is not Economical, such as: the vacuum degree per unit area is increased from -50Kpa to -90Kpa, the suction force is increased by 1.8 times, but the suction time is 4 times longer, so it is more economical to use the vacuum degree below -60Kpa, according to the formula W=P*S*0.0102/μ It can be seen that when the pressure value is determined, increasing the suction cup area can increase the suction force and reduce the vacuum degree. Increasing the suction cup area will increase the suction power, and the suction speed will be very high. Therefore, increasing the suction cup area when the area permits can not only increase the speed, but also reduce energy consumption. However, to increase the area, it is necessary to reduce the length of the pipeline from the vacuum generator to the suction cup. The shorter the length, the faster the suction speed. Due to its small size, the ASL vacuum generator can be directly installed near the top of the manipulator, occupying a small space, so that the vacuum can be generated. If the gas volume between the vacuum generator and the suction cup is small, when the vacuum generator is working, the time to reach the rated suction force is also very short, and the working efficiency of the manipulator is greatly improved.

When the pressure value is determined, the vacuum switch should generate an ON signal to inform the PLC when it reaches this value, and the PLC will control the manipulator to lift and move to the next station at this time. The current vacuum switches are mechanical and electronic. The mechanical switch cannot be precisely controlled, and the response is slow and easy to damage. Therefore, an electronic vacuum switch should be used, but only a digital vacuum switch can accurately control the action point of the PLC. ASL's vacuum generators are integrated with a digital vacuum switch, which has low power consumption, a response speed of about 10ms, and a clear pressure value. When the current pressure value reaches the suction force in time, the ON signal can be generated to tell the PLC to perform the next action, and the transported items reach the next station. When releasing, close the air supply solenoid valve, and only when the pressure drops until the suction cup is lifted and no longer sticks. (About 0～-5Kpa), the vacuum switch sends OFF signal to the PLC, and the suction cup can leave, which greatly improves the reliability of the work.

   As for the destruction valve, the blowing pressure is generated when the vacuum generator starts to release the work, so that the workpiece can be released quickly, but the vacuum generator itself has the function of self-destroying vacuum. When the vacuum generator solenoid valve stops supplying air, the internal vacuum will be It is quickly filled by atmospheric pressure and quickly returns to atmospheric pressure. This time is generally about 0.1 seconds to 0.3 seconds. Therefore, the destruction valve is not necessarily necessary. In most equipment, the self-destruction time of the vacuum generator is fully sufficient for use. When the workpiece is extremely light and sticky, it is necessary to use a vacuum ejector with a break valve function so that the workpiece can be released reliably.

  Therefore, the shape of the vacuum generator is comprehensively considered according to the performance characteristics, weight, and production speed of the equipment.

Features of Vacuum Ejector

1: Clean air, 0.4～0.6Mpa

2: 24VDC solenoid valve

3: Independent air supply regulator,

4: No oil supply