What can the performance indicators of the nut sorting machine refer to?
What are the performance indicators of the nut sorting machine? With the progress of society and the continuous improvement of people's living standards, people's needs for food, entertainment and other aspects are no longer satisfied with the status quo. The nut processing industry is no exception. People put forward higher requirements on the quality and quality of nuts. To a certain extent, it has promoted the continuous improvement and development of nut processing technology and equipment. The nut sorting machine was born, which is dedicated to sorting heterochromatic grains, stones, glutinous rice grains, and powder grains in nuts. Let's take a look togetherNut sorting machineWhich performance indicators can be referred to.
1. Selection rate
The main function of the nut sorting machine in nut processing is to sort grains of different colors (color grains, powder particles, glutinous rice grains, stones, glass, etc.). Therefore, the separation rate of heterochromatic particles is one of the main technical indicators for evaluating the performance of color sorters. As we all know, the calculation method of the selectivity is the ratio of the selected variegated particles to the variegated particles before entering the machine. Generally, the commitment of foreign color sorting machine manufacturers is that when the content of heterochromatic particles is 2% and the design output is equal to, the selection rate is 95%. With the development of color classification technology, the emergence of new high-performance color classifiers is very important for color classifiers. The sorting rate puts forward higher requirements. Some suppliers promise that when the content of heterochromatic particles is 2.3%, the sorting rate of the designed sorter can reach 97%; the content of heterochromatic particles entering the machine is 6%. In this case, a certain amount of flow must be reduced to ensure that the selection rate reaches 95%.
Second, take out the ratio
The extraction rate refers to the proportion of high-quality rice (high-quality) in the selected product, usually expressed as inferior, finished or good. In other words, how many good products each defective product brings out. For uninspected color sorters, different color particles can be separated by only one selection, so the extraction rate may be higher, and the color sorter with inspection can perform a second classification on the defective products selected for the first time. Reduce the high-quality products in the selected products, and significantly reduce the take-out rate. Under normal circumstances, the high paper output ratio is mainly caused by too high sensitivity. Sometimes in order to increase the selection rate of the color sorter, increase the sensitivity and increase the number of injections of the solenoid valve, the paper output rate will be greatly improved. It should be noted that the removal rate is evaluated at a certain selection rate. The high sorting rate and low take-out rate indicate that the sorting performance of the color sorter is good. Generally, the withdrawal ratio should not exceed 1:1. A higher take-out ratio will affect the rice output of polished rice.
The contract index usually does not specify the sensitivity index of the color sorter, but this is only one of the conditions when selecting equipment or suppliers. Consider from two aspects: one is the degree of selection of light yellow rice by the color sorter. Under normal circumstances, when the color sorting machine selects light yellow rice, the selection rate is difficult to reach more than 95%, generally 80% to 90%. This means that if the same light yellow grain rice is used for testing, under certain flow conditions, the higher the selection rate of the color classifier, the higher the sensitivity of the color classifier, instead of blindly increasing the sensitivity to complete; also It can be judged from the damaged area of the polished rice grains. This is mainly determined by the pixels of the color classifier CCD. In the 1990s, the minimum separation area of damaged particles in a color sorter was 1mm2. With the continuous advancement of color separation technology, some of the equipment can also sort damaged particles with an area less than 1mm2, which shows that from a design perspective, the sensitivity of the color separation device has been improved.
When the color sorter is working normally, the rice grains slide in the chute at a speed of 3m/s, and to select different color grains, it must undergo the process of CCD recognition, signal feedback and separation. These processes will be automatically completed immediately, which is controlled by humans. Therefore, the color sorter is required to have a certain degree of stability and automation. In any case, continuous operation must be ensured to ensure that the device automatically adjusts when the bulb continues to dim to ensure that the selection rate remains the same. When the raw material conditions change, the reasonable adjustment of the operator can still ensure that the selection rate remains unchanged within a certain range, the accident rate is low, and the service life of the wearing parts is long.